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pf.c

/*    $FreeBSD: src/sys/contrib/pf/net/pf.c,v 1.34.2.8 2007/11/21 13:52:04 dhartmei Exp $ */
/*    $OpenBSD: pf.c,v 1.502.2.1 2006/05/02 22:55:52 brad Exp $ */

/*
 * Copyright (c) 2001 Daniel Hartmeier
 * Copyright (c) 2002,2003 Henning Brauer
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    - Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    - Redistributions in binary form must reproduce the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer in the documentation and/or other materials provided
 *      with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Effort sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
 *
 */

#ifdef __FreeBSD__
#include "opt_inet.h"
#include "opt_inet6.h"
#endif

#ifdef __FreeBSD__
#include "opt_mac.h"
#include "opt_bpf.h"
#include "opt_pf.h"
#define     NBPFILTER   DEV_BPF
#define     NPFLOG            DEV_PFLOG
#define     NPFSYNC           DEV_PFSYNC
#else
#include "bpfilter.h"
#include "pflog.h"
#include "pfsync.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/filio.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/kernel.h>
#include <sys/time.h>
#ifdef __FreeBSD__
#include <sys/mac.h>
#include <sys/sysctl.h>
#include <sys/endian.h>
#else
#include <sys/pool.h>
#endif

#include <net/if.h>
#include <net/if_types.h>
#include <net/bpf.h>
#include <net/route.h>

#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_seq.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#include <netinet/in_pcb.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/udp_var.h>
#include <netinet/icmp_var.h>
#include <netinet/if_ether.h>

#ifndef __FreeBSD__
#include <dev/rndvar.h>
#endif
#include <net/pfvar.h>
#include <net/if_pflog.h>

#if NPFSYNC > 0
#include <net/if_pfsync.h>
#endif /* NPFSYNC > 0 */

#ifdef INET6
#include <netinet/ip6.h>
#include <netinet/in_pcb.h>
#include <netinet/icmp6.h>
#include <netinet6/nd6.h>
#ifdef __FreeBSD__
#include <netinet6/ip6_var.h>
#include <netinet6/in6_pcb.h>
#endif
#endif /* INET6 */

#ifdef __FreeBSD__
#include <machine/in_cksum.h>
#include <sys/limits.h>
#include <sys/ucred.h>

extern int ip_optcopy(struct ip *, struct ip *);
#endif

#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x

/*
 * Global variables
 */

struct pf_anchor_global  pf_anchors;
struct pf_ruleset  pf_main_ruleset;
struct pf_altqqueue      pf_altqs[2];
struct pf_palist   pf_pabuf;
struct pf_altqqueue     *pf_altqs_active;
struct pf_altqqueue     *pf_altqs_inactive;
struct pf_status   pf_status;

u_int32_t          ticket_altqs_active;
u_int32_t          ticket_altqs_inactive;
int                altqs_inactive_open;
u_int32_t          ticket_pabuf;

#ifdef __FreeBSD__
struct callout           pf_expire_to;                /* expire timeout */
#else
struct timeout           pf_expire_to;                /* expire timeout */
#endif

struct pf_anchor_stackframe {
      struct pf_ruleset             *rs;
      struct pf_rule                      *r;
      struct pf_anchor_node               *parent;
      struct pf_anchor              *child;
} pf_anchor_stack[64];

#ifdef __FreeBSD__
uma_zone_t         pf_src_tree_pl, pf_rule_pl;
uma_zone_t         pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
#else
struct pool        pf_src_tree_pl, pf_rule_pl;
struct pool        pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
#endif

void               pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);

void               pf_init_threshold(struct pf_threshold *, u_int32_t,
                      u_int32_t);
void               pf_add_threshold(struct pf_threshold *);
int                pf_check_threshold(struct pf_threshold *);

void               pf_change_ap(struct pf_addr *, u_int16_t *,
                      u_int16_t *, u_int16_t *, struct pf_addr *,
                      u_int16_t, u_int8_t, sa_family_t);
int                pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
                      struct tcphdr *, struct pf_state_peer *);
#ifdef INET6
void               pf_change_a6(struct pf_addr *, u_int16_t *,
                      struct pf_addr *, u_int8_t);
#endif /* INET6 */
void               pf_change_icmp(struct pf_addr *, u_int16_t *,
                      struct pf_addr *, struct pf_addr *, u_int16_t,
                      u_int16_t *, u_int16_t *, u_int16_t *,
                      u_int16_t *, u_int8_t, sa_family_t);
#ifdef __FreeBSD__
void               pf_send_tcp(struct mbuf *,
                      const struct pf_rule *, sa_family_t,
#else
void               pf_send_tcp(const struct pf_rule *, sa_family_t,
#endif
                      const struct pf_addr *, const struct pf_addr *,
                      u_int16_t, u_int16_t, u_int32_t, u_int32_t,
                      u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
                      struct ether_header *, struct ifnet *);
void               pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
                      sa_family_t, struct pf_rule *);
struct pf_rule          *pf_match_translation(struct pf_pdesc *, struct mbuf *,
                      int, int, struct pfi_kif *,
                      struct pf_addr *, u_int16_t, struct pf_addr *,
                      u_int16_t, int);
struct pf_rule          *pf_get_translation(struct pf_pdesc *, struct mbuf *,
                      int, int, struct pfi_kif *, struct pf_src_node **,
                      struct pf_addr *, u_int16_t,
                      struct pf_addr *, u_int16_t,
                      struct pf_addr *, u_int16_t *);
int                pf_test_tcp(struct pf_rule **, struct pf_state **,
                      int, struct pfi_kif *, struct mbuf *, int,
                      void *, struct pf_pdesc *, struct pf_rule **,
#ifdef __FreeBSD__
                      struct pf_ruleset **, struct ifqueue *,
                      struct inpcb *);
#else
                      struct pf_ruleset **, struct ifqueue *);
#endif
int                pf_test_udp(struct pf_rule **, struct pf_state **,
                      int, struct pfi_kif *, struct mbuf *, int,
                      void *, struct pf_pdesc *, struct pf_rule **,
#ifdef __FreeBSD__
                      struct pf_ruleset **, struct ifqueue *,
                      struct inpcb *);
#else
                      struct pf_ruleset **, struct ifqueue *);
#endif
int                pf_test_icmp(struct pf_rule **, struct pf_state **,
                      int, struct pfi_kif *, struct mbuf *, int,
                      void *, struct pf_pdesc *, struct pf_rule **,
                      struct pf_ruleset **, struct ifqueue *);
int                pf_test_other(struct pf_rule **, struct pf_state **,
                      int, struct pfi_kif *, struct mbuf *, int, void *,
                      struct pf_pdesc *, struct pf_rule **,
                      struct pf_ruleset **, struct ifqueue *);
int                pf_test_fragment(struct pf_rule **, int,
                      struct pfi_kif *, struct mbuf *, void *,
                      struct pf_pdesc *, struct pf_rule **,
                      struct pf_ruleset **);
int                pf_test_state_tcp(struct pf_state **, int,
                      struct pfi_kif *, struct mbuf *, int,
                      void *, struct pf_pdesc *, u_short *);
int                pf_test_state_udp(struct pf_state **, int,
                      struct pfi_kif *, struct mbuf *, int,
                      void *, struct pf_pdesc *);
int                pf_test_state_icmp(struct pf_state **, int,
                      struct pfi_kif *, struct mbuf *, int,
                      void *, struct pf_pdesc *, u_short *);
int                pf_test_state_other(struct pf_state **, int,
                      struct pfi_kif *, struct pf_pdesc *);
struct pf_tag           *pf_get_tag(struct mbuf *);
int                pf_match_tag(struct mbuf *, struct pf_rule *,
                       struct pf_tag **, int *);
void               pf_hash(struct pf_addr *, struct pf_addr *,
                      struct pf_poolhashkey *, sa_family_t);
int                pf_map_addr(u_int8_t, struct pf_rule *,
                      struct pf_addr *, struct pf_addr *,
                      struct pf_addr *, struct pf_src_node **);
int                pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
                      struct pf_addr *, struct pf_addr *, u_int16_t,
                      struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
                      struct pf_src_node **);
void               pf_route(struct mbuf **, struct pf_rule *, int,
                      struct ifnet *, struct pf_state *);
void               pf_route6(struct mbuf **, struct pf_rule *, int,
                      struct ifnet *, struct pf_state *);
#ifdef __FreeBSD__
int                pf_socket_lookup(uid_t *, gid_t *,
                      int, struct pf_pdesc *, struct inpcb *);
#else
int                pf_socket_lookup(uid_t *, gid_t *,
                      int, struct pf_pdesc *);
#endif
u_int8_t           pf_get_wscale(struct mbuf *, int, u_int16_t,
                      sa_family_t);
u_int16_t          pf_get_mss(struct mbuf *, int, u_int16_t,
                      sa_family_t);
u_int16_t          pf_calc_mss(struct pf_addr *, sa_family_t,
                        u_int16_t);
void               pf_set_rt_ifp(struct pf_state *,
                      struct pf_addr *);
int                pf_check_proto_cksum(struct mbuf *, int, int,
                      u_int8_t, sa_family_t);
int                pf_addr_wrap_neq(struct pf_addr_wrap *,
                      struct pf_addr_wrap *);
static int         pf_add_mbuf_tag(struct mbuf *, u_int);
struct pf_state         *pf_find_state_recurse(struct pfi_kif *,
                      struct pf_state *, u_int8_t);
int                pf_src_connlimit(struct pf_state **);
int                pf_check_congestion(struct ifqueue *);

#ifdef __FreeBSD__
int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);

struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX];

#else
struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
      { &pf_state_pl, PFSTATE_HIWAT },
      { &pf_src_tree_pl, PFSNODE_HIWAT },
      { &pf_frent_pl, PFFRAG_FRENT_HIWAT }
};
#endif

#define STATE_LOOKUP()                                      \
      do {                                            \
            if (direction == PF_IN)                         \
                  *state = pf_find_state_recurse(                 \
                      kif, &key, PF_EXT_GWY);               \
            else                                      \
                  *state = pf_find_state_recurse(                 \
                      kif, &key, PF_LAN_EXT);               \
            if (*state == NULL || (*state)->timeout == PFTM_PURGE)      \
                  return (PF_DROP);                   \
            if (direction == PF_OUT &&                      \
                (((*state)->rule.ptr->rt == PF_ROUTETO &&         \
                (*state)->rule.ptr->direction == PF_OUT) ||       \
                ((*state)->rule.ptr->rt == PF_REPLYTO &&          \
                (*state)->rule.ptr->direction == PF_IN)) &&       \
                (*state)->rt_kif != NULL &&                       \
                (*state)->rt_kif != kif)                    \
                  return (PF_PASS);                   \
      } while (0)

#define     STATE_TRANSLATE(s) \
      (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \
      ((s)->af == AF_INET6 && \
      ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \
      (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \
      (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \
      (s)->lan.port != (s)->gwy.port

#define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) :   \
      ((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent :             \
      (k)->pfik_parent->pfik_parent)

#define STATE_INC_COUNTERS(s)                   \
      do {                                \
            s->rule.ptr->states++;              \
            if (s->anchor.ptr != NULL)          \
                  s->anchor.ptr->states++;      \
            if (s->nat_rule.ptr != NULL)        \
                  s->nat_rule.ptr->states++;    \
      } while (0)

#define STATE_DEC_COUNTERS(s)                   \
      do {                                \
            if (s->nat_rule.ptr != NULL)        \
                  s->nat_rule.ptr->states--;    \
            if (s->anchor.ptr != NULL)          \
                  s->anchor.ptr->states--;      \
            s->rule.ptr->states--;              \
      } while (0)

#ifndef __FreeBSD__
static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
static __inline int pf_state_compare_lan_ext(struct pf_state *,
      struct pf_state *);
static __inline int pf_state_compare_ext_gwy(struct pf_state *,
      struct pf_state *);
static __inline int pf_state_compare_id(struct pf_state *,
      struct pf_state *);
static __inline int pf_anchor_compare(struct pf_anchor *, struct pf_anchor *);
#else
static int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
static int pf_state_compare_lan_ext(struct pf_state *,
      struct pf_state *);
static int pf_state_compare_ext_gwy(struct pf_state *,
      struct pf_state *);
static int pf_state_compare_id(struct pf_state *,
      struct pf_state *);
static int pf_anchor_compare(struct pf_anchor *, struct pf_anchor *);
#endif

struct pf_src_tree tree_src_tracking;

struct pf_state_tree_id tree_id;
struct pf_state_queue state_updates;

RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
RB_GENERATE(pf_state_tree_lan_ext, pf_state,
    u.s.entry_lan_ext, pf_state_compare_lan_ext);
RB_GENERATE(pf_state_tree_ext_gwy, pf_state,
    u.s.entry_ext_gwy, pf_state_compare_ext_gwy);
RB_GENERATE(pf_state_tree_id, pf_state,
    u.s.entry_id, pf_state_compare_id);
RB_GENERATE(pf_anchor_global, pf_anchor, entry_global, pf_anchor_compare);
RB_GENERATE(pf_anchor_node, pf_anchor, entry_node, pf_anchor_compare);

#ifdef __FreeBSD__
static int
#else
static __inline int
#endif
pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
{
      int   diff;

      if (a->rule.ptr > b->rule.ptr)
            return (1);
      if (a->rule.ptr < b->rule.ptr)
            return (-1);
      if ((diff = a->af - b->af) != 0)
            return (diff);
      switch (a->af) {
#ifdef INET
      case AF_INET:
            if (a->addr.addr32[0] > b->addr.addr32[0])
                  return (1);
            if (a->addr.addr32[0] < b->addr.addr32[0])
                  return (-1);
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            if (a->addr.addr32[3] > b->addr.addr32[3])
                  return (1);
            if (a->addr.addr32[3] < b->addr.addr32[3])
                  return (-1);
            if (a->addr.addr32[2] > b->addr.addr32[2])
                  return (1);
            if (a->addr.addr32[2] < b->addr.addr32[2])
                  return (-1);
            if (a->addr.addr32[1] > b->addr.addr32[1])
                  return (1);
            if (a->addr.addr32[1] < b->addr.addr32[1])
                  return (-1);
            if (a->addr.addr32[0] > b->addr.addr32[0])
                  return (1);
            if (a->addr.addr32[0] < b->addr.addr32[0])
                  return (-1);
            break;
#endif /* INET6 */
      }
      return (0);
}

#ifdef __FreeBSD__
static int
#else
static __inline int
#endif
pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b)
{
      int   diff;

      if ((diff = a->proto - b->proto) != 0)
            return (diff);
      if ((diff = a->af - b->af) != 0)
            return (diff);
      switch (a->af) {
#ifdef INET
      case AF_INET:
            if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
                  return (1);
            if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
                  return (-1);
            if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
                  return (1);
            if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
                  return (-1);
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
                  return (1);
            if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
                  return (-1);
            if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
                  return (1);
            if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
                  return (-1);
            if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
                  return (1);
            if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
                  return (-1);
            if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
                  return (1);
            if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
                  return (-1);
            if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
                  return (1);
            if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
                  return (-1);
            if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
                  return (1);
            if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
                  return (-1);
            if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
                  return (1);
            if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
                  return (-1);
            if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
                  return (1);
            if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
                  return (-1);
            break;
#endif /* INET6 */
      }

      if ((diff = a->lan.port - b->lan.port) != 0)
            return (diff);
      if ((diff = a->ext.port - b->ext.port) != 0)
            return (diff);

      return (0);
}

#ifdef __FreeBSD__
static int
#else
static __inline int
#endif
pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b)
{
      int   diff;

      if ((diff = a->proto - b->proto) != 0)
            return (diff);
      if ((diff = a->af - b->af) != 0)
            return (diff);
      switch (a->af) {
#ifdef INET
      case AF_INET:
            if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
                  return (1);
            if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
                  return (-1);
            if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
                  return (1);
            if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
                  return (-1);
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
                  return (1);
            if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
                  return (-1);
            if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
                  return (1);
            if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
                  return (-1);
            if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
                  return (1);
            if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
                  return (-1);
            if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
                  return (1);
            if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
                  return (-1);
            if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
                  return (1);
            if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
                  return (-1);
            if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
                  return (1);
            if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
                  return (-1);
            if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
                  return (1);
            if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
                  return (-1);
            if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
                  return (1);
            if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
                  return (-1);
            break;
#endif /* INET6 */
      }

      if ((diff = a->ext.port - b->ext.port) != 0)
            return (diff);
      if ((diff = a->gwy.port - b->gwy.port) != 0)
            return (diff);

      return (0);
}

#ifdef __FreeBSD__
static int
#else
static __inline int
#endif
pf_state_compare_id(struct pf_state *a, struct pf_state *b)
{
      if (a->id > b->id)
            return (1);
      if (a->id < b->id)
            return (-1);
      if (a->creatorid > b->creatorid)
            return (1);
      if (a->creatorid < b->creatorid)
            return (-1);

      return (0);
}

#ifdef __FreeBSD__
static int
#else
static __inline int
#endif
pf_anchor_compare(struct pf_anchor *a, struct pf_anchor *b)
{
      int c = strcmp(a->path, b->path);

      return (c ? (c < 0 ? -1 : 1) : 0);
}

#ifdef INET6
void
pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
{
      switch (af) {
#ifdef INET
      case AF_INET:
            dst->addr32[0] = src->addr32[0];
            break;
#endif /* INET */
      case AF_INET6:
            dst->addr32[0] = src->addr32[0];
            dst->addr32[1] = src->addr32[1];
            dst->addr32[2] = src->addr32[2];
            dst->addr32[3] = src->addr32[3];
            break;
      }
}
#endif /* INET6 */

struct pf_state *
pf_find_state_byid(struct pf_state *key)
{
      pf_status.fcounters[FCNT_STATE_SEARCH]++;
      return (RB_FIND(pf_state_tree_id, &tree_id, key));
}

struct pf_state *
pf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree)
{
      struct pf_state *s;

      pf_status.fcounters[FCNT_STATE_SEARCH]++;

      switch (tree) {
      case PF_LAN_EXT:
            for (; kif != NULL; kif = kif->pfik_parent) {
                  s = RB_FIND(pf_state_tree_lan_ext,
                      &kif->pfik_lan_ext, key);
                  if (s != NULL)
                        return (s);
            }
            return (NULL);
      case PF_EXT_GWY:
            for (; kif != NULL; kif = kif->pfik_parent) {
                  s = RB_FIND(pf_state_tree_ext_gwy,
                      &kif->pfik_ext_gwy, key);
                  if (s != NULL)
                        return (s);
            }
            return (NULL);
      default:
            panic("pf_find_state_recurse");
      }
}

struct pf_state *
pf_find_state_all(struct pf_state *key, u_int8_t tree, int *more)
{
      struct pf_state *s, *ss = NULL;
      struct pfi_kif    *kif;

      pf_status.fcounters[FCNT_STATE_SEARCH]++;

      switch (tree) {
      case PF_LAN_EXT:
            TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
                  s = RB_FIND(pf_state_tree_lan_ext,
                      &kif->pfik_lan_ext, key);
                  if (s == NULL)
                        continue;
                  if (more == NULL)
                        return (s);
                  ss = s;
                  (*more)++;
            }
            return (ss);
      case PF_EXT_GWY:
            TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
                  s = RB_FIND(pf_state_tree_ext_gwy,
                      &kif->pfik_ext_gwy, key);
                  if (s == NULL)
                        continue;
                  if (more == NULL)
                        return (s);
                  ss = s;
                  (*more)++;
            }
            return (ss);
      default:
            panic("pf_find_state_all");
      }
}

void
pf_init_threshold(struct pf_threshold *threshold,
    u_int32_t limit, u_int32_t seconds)
{
      threshold->limit = limit * PF_THRESHOLD_MULT;
      threshold->seconds = seconds;
      threshold->count = 0;
      threshold->last = time_second;
}

void
pf_add_threshold(struct pf_threshold *threshold)
{
      u_int32_t t = time_second, diff = t - threshold->last;

      if (diff >= threshold->seconds)
            threshold->count = 0;
      else
            threshold->count -= threshold->count * diff /
                threshold->seconds;
      threshold->count += PF_THRESHOLD_MULT;
      threshold->last = t;
}

int
pf_check_threshold(struct pf_threshold *threshold)
{
      return (threshold->count > threshold->limit);
}

int
pf_src_connlimit(struct pf_state **state)
{
      struct pf_state   *s;
      int bad = 0;

      (*state)->src_node->conn++;
#ifdef __FreeBSD__
      (*state)->local_flags |= PFSTATE_SRC_CONN;
#endif
      pf_add_threshold(&(*state)->src_node->conn_rate);

      if ((*state)->rule.ptr->max_src_conn &&
          (*state)->rule.ptr->max_src_conn <
          (*state)->src_node->conn) {
            pf_status.lcounters[LCNT_SRCCONN]++;
            bad++;
      }

      if ((*state)->rule.ptr->max_src_conn_rate.limit &&
          pf_check_threshold(&(*state)->src_node->conn_rate)) {
            pf_status.lcounters[LCNT_SRCCONNRATE]++;
            bad++;
      }

      if (!bad)
            return (0);

      if ((*state)->rule.ptr->overload_tbl) {
            struct pfr_addr p;
            u_int32_t   killed = 0;

            pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
            if (pf_status.debug >= PF_DEBUG_MISC) {
                  printf("pf_src_connlimit: blocking address ");
                  pf_print_host(&(*state)->src_node->addr, 0,
                      (*state)->af);
            }

            bzero(&p, sizeof(p));
            p.pfra_af = (*state)->af;
            switch ((*state)->af) {
#ifdef INET
            case AF_INET:
                  p.pfra_net = 32;
                  p.pfra_ip4addr = (*state)->src_node->addr.v4;
                  break;
#endif /* INET */
#ifdef INET6
            case AF_INET6:
                  p.pfra_net = 128;
                  p.pfra_ip6addr = (*state)->src_node->addr.v6;
                  break;
#endif /* INET6 */
            }

            pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
                &p, time_second);

            /* kill existing states if that's required. */
            if ((*state)->rule.ptr->flush) {
                  pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;

                  RB_FOREACH(s, pf_state_tree_id, &tree_id) {
                        /*
                         * Kill states from this source.  (Only those
                         * from the same rule if PF_FLUSH_GLOBAL is not
                         * set)
                         */
                        if (s->af == (*state)->af &&
                            (((*state)->direction == PF_OUT &&
                            PF_AEQ(&(*state)->src_node->addr,
                            &s->lan.addr, s->af)) ||
                            ((*state)->direction == PF_IN &&
                            PF_AEQ(&(*state)->src_node->addr,
                            &s->ext.addr, s->af))) &&
                            ((*state)->rule.ptr->flush &
                            PF_FLUSH_GLOBAL ||
                            (*state)->rule.ptr == s->rule.ptr)) {
                              s->timeout = PFTM_PURGE;
                              s->src.state = s->dst.state =
                                  TCPS_CLOSED;
                              killed++;
                        }
                  }
                  if (pf_status.debug >= PF_DEBUG_MISC)
                        printf(", %u states killed", killed);
            }
            if (pf_status.debug >= PF_DEBUG_MISC)
                  printf("\n");
      }

      /* kill this state */
      (*state)->timeout = PFTM_PURGE;
      (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
      return (1);
}

int
pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
    struct pf_addr *src, sa_family_t af)
{
      struct pf_src_node      k;

      if (*sn == NULL) {
            k.af = af;
            PF_ACPY(&k.addr, src, af);
            if (rule->rule_flag & PFRULE_RULESRCTRACK ||
                rule->rpool.opts & PF_POOL_STICKYADDR)
                  k.rule.ptr = rule;
            else
                  k.rule.ptr = NULL;
            pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
            *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
      }
      if (*sn == NULL) {
            if (!rule->max_src_nodes ||
                rule->src_nodes < rule->max_src_nodes)
                  (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT);
            else
                  pf_status.lcounters[LCNT_SRCNODES]++;
            if ((*sn) == NULL)
                  return (-1);
            bzero(*sn, sizeof(struct pf_src_node));

            pf_init_threshold(&(*sn)->conn_rate,
                rule->max_src_conn_rate.limit,
                rule->max_src_conn_rate.seconds);

            (*sn)->af = af;
            if (rule->rule_flag & PFRULE_RULESRCTRACK ||
                rule->rpool.opts & PF_POOL_STICKYADDR)
                  (*sn)->rule.ptr = rule;
            else
                  (*sn)->rule.ptr = NULL;
            PF_ACPY(&(*sn)->addr, src, af);
            if (RB_INSERT(pf_src_tree,
                &tree_src_tracking, *sn) != NULL) {
                  if (pf_status.debug >= PF_DEBUG_MISC) {
                        printf("pf: src_tree insert failed: ");
                        pf_print_host(&(*sn)->addr, 0, af);
                        printf("\n");
                  }
                  pool_put(&pf_src_tree_pl, *sn);
                  return (-1);
            }
            (*sn)->creation = time_second;
            (*sn)->ruletype = rule->action;
            if ((*sn)->rule.ptr != NULL)
                  (*sn)->rule.ptr->src_nodes++;
            pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
            pf_status.src_nodes++;
      } else {
            if (rule->max_src_states &&
                (*sn)->states >= rule->max_src_states) {
                  pf_status.lcounters[LCNT_SRCSTATES]++;
                  return (-1);
            }
      }
      return (0);
}

int
pf_insert_state(struct pfi_kif *kif, struct pf_state *state)
{
      /* Thou MUST NOT insert multiple duplicate keys */
      state->u.s.kif = kif;
      if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) {
            if (pf_status.debug >= PF_DEBUG_MISC) {
                  printf("pf: state insert failed: tree_lan_ext");
                  printf(" lan: ");
                  pf_print_host(&state->lan.addr, state->lan.port,
                      state->af);
                  printf(" gwy: ");
                  pf_print_host(&state->gwy.addr, state->gwy.port,
                      state->af);
                  printf(" ext: ");
                  pf_print_host(&state->ext.addr, state->ext.port,
                      state->af);
                  if (state->sync_flags & PFSTATE_FROMSYNC)
                        printf(" (from sync)");
                  printf("\n");
            }
            return (-1);
      }

      if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) {
            if (pf_status.debug >= PF_DEBUG_MISC) {
                  printf("pf: state insert failed: tree_ext_gwy");
                  printf(" lan: ");
                  pf_print_host(&state->lan.addr, state->lan.port,
                      state->af);
                  printf(" gwy: ");
                  pf_print_host(&state->gwy.addr, state->gwy.port,
                      state->af);
                  printf(" ext: ");
                  pf_print_host(&state->ext.addr, state->ext.port,
                      state->af);
                  if (state->sync_flags & PFSTATE_FROMSYNC)
                        printf(" (from sync)");
                  printf("\n");
            }
            RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
            return (-1);
      }

      if (state->id == 0 && state->creatorid == 0) {
            state->id = htobe64(pf_status.stateid++);
            state->creatorid = pf_status.hostid;
      }
      if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) {
            if (pf_status.debug >= PF_DEBUG_MISC) {
#ifdef __FreeBSD__
                  printf("pf: state insert failed: "
                      "id: %016llx creatorid: %08x",
                      (long long)be64toh(state->id),
                      ntohl(state->creatorid));
#else
                  printf("pf: state insert failed: "
                      "id: %016llx creatorid: %08x",
                      betoh64(state->id), ntohl(state->creatorid));
#endif
                  if (state->sync_flags & PFSTATE_FROMSYNC)
                        printf(" (from sync)");
                  printf("\n");
            }
            RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
            RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state);
            return (-1);
      }
      TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates);

      pf_status.fcounters[FCNT_STATE_INSERT]++;
      pf_status.states++;
      pfi_attach_state(kif);
#if NPFSYNC
      pfsync_insert_state(state);
#endif
      return (0);
}

void
pf_purge_timeout(void *arg)
{
#ifdef __FreeBSD__
      struct callout  *to = arg;
#else
      struct timeout    *to = arg;
#endif
      int          s;

#ifdef __FreeBSD__
      PF_LOCK();
#endif
      s = splsoftnet();
      pf_purge_expired_states();
      pf_purge_expired_fragments();
      pf_purge_expired_src_nodes();
      splx(s);
#ifdef __FreeBSD__
      PF_UNLOCK();
#endif

#ifdef __FreeBSD__
      callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz,
          pf_purge_timeout, to);
#else
      timeout_add(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz);
#endif
}

u_int32_t
pf_state_expires(const struct pf_state *state)
{
      u_int32_t   timeout;
      u_int32_t   start;
      u_int32_t   end;
      u_int32_t   states;

      /* handle all PFTM_* > PFTM_MAX here */
      if (state->timeout == PFTM_PURGE)
            return (time_second);
      if (state->timeout == PFTM_UNTIL_PACKET)
            return (0);
#ifdef __FreeBSD__      
      KASSERT((state->timeout < PFTM_MAX), 
          ("pf_state_expires: timeout > PFTM_MAX"));
#else
      KASSERT(state->timeout < PFTM_MAX);
#endif
      timeout = state->rule.ptr->timeout[state->timeout];
      if (!timeout)
            timeout = pf_default_rule.timeout[state->timeout];
      start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
      if (start) {
            end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
            states = state->rule.ptr->states;
      } else {
            start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
            end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
            states = pf_status.states;
      }
      if (end && states > start && start < end) {
            if (states < end)
                  return (state->expire + timeout * (end - states) /
                      (end - start));
            else
                  return (time_second);
      }
      return (state->expire + timeout);
}

void
pf_purge_expired_src_nodes(void)
{
       struct pf_src_node           *cur, *next;

       for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
             next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);

             if (cur->states <= 0 && cur->expire <= time_second) {
                   if (cur->rule.ptr != NULL) {
                         cur->rule.ptr->src_nodes--;
                         if (cur->rule.ptr->states <= 0 &&
                             cur->rule.ptr->max_src_nodes <= 0)
                               pf_rm_rule(NULL, cur->rule.ptr);
                   }
                   RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
                   pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
                   pf_status.src_nodes--;
                   pool_put(&pf_src_tree_pl, cur);
             }
       }
}

void
pf_src_tree_remove_state(struct pf_state *s)
{
      u_int32_t timeout;

      if (s->src_node != NULL) {
            if (s->proto == IPPROTO_TCP) {
#ifdef __FreeBSD__
                  if (s->local_flags & PFSTATE_SRC_CONN)
#else
                  if (s->src.state == PF_TCPS_PROXY_DST ||
                      s->timeout >= PFTM_TCP_ESTABLISHED)
#endif
                        --s->src_node->conn;
            }
            if (--s->src_node->states <= 0) {
                  timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
                  if (!timeout)
                        timeout =
                            pf_default_rule.timeout[PFTM_SRC_NODE];
                  s->src_node->expire = time_second + timeout;
            }
      }
      if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
            if (--s->nat_src_node->states <= 0) {
                  timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
                  if (!timeout)
                        timeout =
                            pf_default_rule.timeout[PFTM_SRC_NODE];
                  s->nat_src_node->expire = time_second + timeout;
            }
      }
      s->src_node = s->nat_src_node = NULL;
}

void
pf_purge_expired_state(struct pf_state *cur)
{
#ifdef __FreeBSD__
      if (cur->local_flags & PFSTATE_EXPIRING)
            return;
      cur->local_flags |= PFSTATE_EXPIRING;
#endif
      if (cur->src.state == PF_TCPS_PROXY_DST)
#ifdef __FreeBSD__
            pf_send_tcp(NULL, cur->rule.ptr, cur->af,
#else
            pf_send_tcp(cur->rule.ptr, cur->af,
#endif
                &cur->ext.addr, &cur->lan.addr,
                cur->ext.port, cur->lan.port,
                cur->src.seqhi, cur->src.seqlo + 1,
                TH_RST|TH_ACK, 0, 0, 0, 1, NULL, NULL);
      RB_REMOVE(pf_state_tree_ext_gwy,
          &cur->u.s.kif->pfik_ext_gwy, cur);
      RB_REMOVE(pf_state_tree_lan_ext,
          &cur->u.s.kif->pfik_lan_ext, cur);
      RB_REMOVE(pf_state_tree_id, &tree_id, cur);
#if NPFSYNC
      pfsync_delete_state(cur);
#endif
      pf_src_tree_remove_state(cur);
      if (--cur->rule.ptr->states <= 0 &&
          cur->rule.ptr->src_nodes <= 0)
            pf_rm_rule(NULL, cur->rule.ptr);
      if (cur->nat_rule.ptr != NULL)
            if (--cur->nat_rule.ptr->states <= 0 &&
                  cur->nat_rule.ptr->src_nodes <= 0)
                  pf_rm_rule(NULL, cur->nat_rule.ptr);
      if (cur->anchor.ptr != NULL)
            if (--cur->anchor.ptr->states <= 0)
                  pf_rm_rule(NULL, cur->anchor.ptr);
      pf_normalize_tcp_cleanup(cur);
      pfi_detach_state(cur->u.s.kif);
      TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates);
      if (cur->tag)
            pf_tag_unref(cur->tag);
      pool_put(&pf_state_pl, cur);
      pf_status.fcounters[FCNT_STATE_REMOVALS]++;
      pf_status.states--;
}

void
pf_purge_expired_states(void)
{
      struct pf_state         *cur, *next;

      for (cur = RB_MIN(pf_state_tree_id, &tree_id);
          cur; cur = next) {
            next = RB_NEXT(pf_state_tree_id, &tree_id, cur);
            if (pf_state_expires(cur) <= time_second)
                  pf_purge_expired_state(cur);
      }
}

int
pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
{
      if (aw->type != PF_ADDR_TABLE)
            return (0);
      if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
            return (1);
      return (0);
}

void
pf_tbladdr_remove(struct pf_addr_wrap *aw)
{
      if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
            return;
      pfr_detach_table(aw->p.tbl);
      aw->p.tbl = NULL;
}

void
pf_tbladdr_copyout(struct pf_addr_wrap *aw)
{
      struct pfr_ktable *kt = aw->p.tbl;

      if (aw->type != PF_ADDR_TABLE || kt == NULL)
            return;
      if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
            kt = kt->pfrkt_root;
      aw->p.tbl = NULL;
      aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
            kt->pfrkt_cnt : -1;
}

void
pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
{
      switch (af) {
#ifdef INET
      case AF_INET: {
            u_int32_t a = ntohl(addr->addr32[0]);
            printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
                (a>>8)&255, a&255);
            if (p) {
                  p = ntohs(p);
                  printf(":%u", p);
            }
            break;
      }
#endif /* INET */
#ifdef INET6
      case AF_INET6: {
            u_int16_t b;
            u_int8_t i, curstart = 255, curend = 0,
                maxstart = 0, maxend = 0;
            for (i = 0; i < 8; i++) {
                  if (!addr->addr16[i]) {
                        if (curstart == 255)
                              curstart = i;
                        else
                              curend = i;
                  } else {
                        if (curstart) {
                              if ((curend - curstart) >
                                  (maxend - maxstart)) {
                                    maxstart = curstart;
                                    maxend = curend;
                                    curstart = 255;
                              }
                        }
                  }
            }
            for (i = 0; i < 8; i++) {
                  if (i >= maxstart && i <= maxend) {
                        if (maxend != 7) {
                              if (i == maxstart)
                                    printf(":");
                        } else {
                              if (i == maxend)
                                    printf(":");
                        }
                  } else {
                        b = ntohs(addr->addr16[i]);
                        printf("%x", b);
                        if (i < 7)
                              printf(":");
                  }
            }
            if (p) {
                  p = ntohs(p);
                  printf("[%u]", p);
            }
            break;
      }
#endif /* INET6 */
      }
}

void
pf_print_state(struct pf_state *s)
{
      switch (s->proto) {
      case IPPROTO_TCP:
            printf("TCP ");
            break;
      case IPPROTO_UDP:
            printf("UDP ");
            break;
      case IPPROTO_ICMP:
            printf("ICMP ");
            break;
      case IPPROTO_ICMPV6:
            printf("ICMPV6 ");
            break;
      default:
            printf("%u ", s->proto);
            break;
      }
      pf_print_host(&s->lan.addr, s->lan.port, s->af);
      printf(" ");
      pf_print_host(&s->gwy.addr, s->gwy.port, s->af);
      printf(" ");
      pf_print_host(&s->ext.addr, s->ext.port, s->af);
      printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
          s->src.seqhi, s->src.max_win, s->src.seqdiff);
      if (s->src.wscale && s->dst.wscale)
            printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
      printf("]");
      printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
          s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
      if (s->src.wscale && s->dst.wscale)
            printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
      printf("]");
      printf(" %u:%u", s->src.state, s->dst.state);
}

void
pf_print_flags(u_int8_t f)
{
      if (f)
            printf(" ");
      if (f & TH_FIN)
            printf("F");
      if (f & TH_SYN)
            printf("S");
      if (f & TH_RST)
            printf("R");
      if (f & TH_PUSH)
            printf("P");
      if (f & TH_ACK)
            printf("A");
      if (f & TH_URG)
            printf("U");
      if (f & TH_ECE)
            printf("E");
      if (f & TH_CWR)
            printf("W");
}

#define     PF_SET_SKIP_STEPS(i)                            \
      do {                                      \
            while (head[i] != cur) {                  \
                  head[i]->skip[i].ptr = cur;         \
                  head[i] = TAILQ_NEXT(head[i], entries);   \
            }                                   \
      } while (0)

void
pf_calc_skip_steps(struct pf_rulequeue *rules)
{
      struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
      int i;

      cur = TAILQ_FIRST(rules);
      prev = cur;
      for (i = 0; i < PF_SKIP_COUNT; ++i)
            head[i] = cur;
      while (cur != NULL) {

            if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
                  PF_SET_SKIP_STEPS(PF_SKIP_IFP);
            if (cur->direction != prev->direction)
                  PF_SET_SKIP_STEPS(PF_SKIP_DIR);
            if (cur->af != prev->af)
                  PF_SET_SKIP_STEPS(PF_SKIP_AF);
            if (cur->proto != prev->proto)
                  PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
            if (cur->src.neg != prev->src.neg ||
                pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
                  PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
            if (cur->src.port[0] != prev->src.port[0] ||
                cur->src.port[1] != prev->src.port[1] ||
                cur->src.port_op != prev->src.port_op)
                  PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
            if (cur->dst.neg != prev->dst.neg ||
                pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
                  PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
            if (cur->dst.port[0] != prev->dst.port[0] ||
                cur->dst.port[1] != prev->dst.port[1] ||
                cur->dst.port_op != prev->dst.port_op)
                  PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);

            prev = cur;
            cur = TAILQ_NEXT(cur, entries);
      }
      for (i = 0; i < PF_SKIP_COUNT; ++i)
            PF_SET_SKIP_STEPS(i);
}

int
pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
{
      if (aw1->type != aw2->type)
            return (1);
      switch (aw1->type) {
      case PF_ADDR_ADDRMASK:
            if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
                  return (1);
            if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
                  return (1);
            return (0);
      case PF_ADDR_DYNIFTL:
            return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
      case PF_ADDR_NOROUTE:
            return (0);
      case PF_ADDR_TABLE:
            return (aw1->p.tbl != aw2->p.tbl);
      default:
            printf("invalid address type: %d\n", aw1->type);
            return (1);
      }
}

u_int16_t
pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
{
      u_int32_t   l;

      if (udp && !cksum)
            return (0x0000);
      l = cksum + old - new;
      l = (l >> 16) + (l & 65535);
      l = l & 65535;
      if (udp && !l)
            return (0xFFFF);
      return (l);
}

void
pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
    struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
{
      struct pf_addr    ao;
      u_int16_t   po = *p;

      PF_ACPY(&ao, a, af);
      PF_ACPY(a, an, af);

      *p = pn;

      switch (af) {
#ifdef INET
      case AF_INET:
            *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
                ao.addr16[0], an->addr16[0], 0),
                ao.addr16[1], an->addr16[1], 0);
            *p = pn;
            *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
                ao.addr16[0], an->addr16[0], u),
                ao.addr16[1], an->addr16[1], u),
                po, pn, u);
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
                pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
                pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
                ao.addr16[0], an->addr16[0], u),
                ao.addr16[1], an->addr16[1], u),
                ao.addr16[2], an->addr16[2], u),
                ao.addr16[3], an->addr16[3], u),
                ao.addr16[4], an->addr16[4], u),
                ao.addr16[5], an->addr16[5], u),
                ao.addr16[6], an->addr16[6], u),
                ao.addr16[7], an->addr16[7], u),
                po, pn, u);
            break;
#endif /* INET6 */
      }
}


/* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
void
pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
{
      u_int32_t   ao;

      memcpy(&ao, a, sizeof(ao));
      memcpy(a, &an, sizeof(u_int32_t));
      *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
          ao % 65536, an % 65536, u);
}

#ifdef INET6
void
pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
{
      struct pf_addr    ao;

      PF_ACPY(&ao, a, AF_INET6);
      PF_ACPY(a, an, AF_INET6);

      *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
          pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
          pf_cksum_fixup(pf_cksum_fixup(*c,
          ao.addr16[0], an->addr16[0], u),
          ao.addr16[1], an->addr16[1], u),
          ao.addr16[2], an->addr16[2], u),
          ao.addr16[3], an->addr16[3], u),
          ao.addr16[4], an->addr16[4], u),
          ao.addr16[5], an->addr16[5], u),
          ao.addr16[6], an->addr16[6], u),
          ao.addr16[7], an->addr16[7], u);
}
#endif /* INET6 */


/*
 * Need to modulate the sequence numbers in the TCP SACK option
 */
int
pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
    struct tcphdr *th, struct pf_state_peer *dst)
{
      int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
      u_int8_t opts[MAX_TCPOPTLEN], *opt = opts;
      int copyback = 0, i, olen;
      struct sackblk sack;

#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
      if (hlen < TCPOLEN_SACKLEN ||
          !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
            return 0;

      while (hlen >= TCPOLEN_SACKLEN) {
            olen = opt[1];
            switch (*opt) {
            case TCPOPT_EOL:  /* FALLTHROUGH */
            case TCPOPT_NOP:
                  opt++;
                  hlen--;
                  break;
            case TCPOPT_SACK:
                  if (olen > hlen)
                        olen = hlen;
                  if (olen >= TCPOLEN_SACKLEN) {
                        for (i = 2; i + TCPOLEN_SACK <= olen;
                            i += TCPOLEN_SACK) {
                              memcpy(&sack, &opt[i], sizeof(sack));
                              pf_change_a(&sack.start, &th->th_sum,
                                  htonl(ntohl(sack.start) -
                                  dst->seqdiff), 0);
                              pf_change_a(&sack.end, &th->th_sum,
                                  htonl(ntohl(sack.end) -
                                  dst->seqdiff), 0);
                              memcpy(&opt[i], &sack, sizeof(sack));
                        }
                        copyback = 1;
                  }
                  /* FALLTHROUGH */
            default:
                  if (olen < 2)
                        olen = 2;
                  hlen -= olen;
                  opt += olen;
            }
      }

      if (copyback)
            m_copyback(m, off + sizeof(*th), thoptlen, opts);
      return (copyback);
}

void
pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
    struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
    u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
{
      struct pf_addr    oia, ooa;

      PF_ACPY(&oia, ia, af);
      PF_ACPY(&ooa, oa, af);

      /* Change inner protocol port, fix inner protocol checksum. */
      if (ip != NULL) {
            u_int16_t   oip = *ip;
            u_int32_t   opc = 0;    /* make the compiler happy */

            if (pc != NULL)
                  opc = *pc;
            *ip = np;
            if (pc != NULL)
                  *pc = pf_cksum_fixup(*pc, oip, *ip, u);
            *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
            if (pc != NULL)
                  *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
      }
      /* Change inner ip address, fix inner ip and icmp checksums. */
      PF_ACPY(ia, na, af);
      switch (af) {
#ifdef INET
      case AF_INET: {
            u_int32_t    oh2c = *h2c;

            *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
                oia.addr16[0], ia->addr16[0], 0),
                oia.addr16[1], ia->addr16[1], 0);
            *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
                oia.addr16[0], ia->addr16[0], 0),
                oia.addr16[1], ia->addr16[1], 0);
            *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
            break;
      }
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
                pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
                pf_cksum_fixup(pf_cksum_fixup(*ic,
                oia.addr16[0], ia->addr16[0], u),
                oia.addr16[1], ia->addr16[1], u),
                oia.addr16[2], ia->addr16[2], u),
                oia.addr16[3], ia->addr16[3], u),
                oia.addr16[4], ia->addr16[4], u),
                oia.addr16[5], ia->addr16[5], u),
                oia.addr16[6], ia->addr16[6], u),
                oia.addr16[7], ia->addr16[7], u);
            break;
#endif /* INET6 */
      }
      /* Change outer ip address, fix outer ip or icmpv6 checksum. */
      PF_ACPY(oa, na, af);
      switch (af) {
#ifdef INET
      case AF_INET:
            *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
                ooa.addr16[0], oa->addr16[0], 0),
                ooa.addr16[1], oa->addr16[1], 0);
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
                pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
                pf_cksum_fixup(pf_cksum_fixup(*ic,
                ooa.addr16[0], oa->addr16[0], u),
                ooa.addr16[1], oa->addr16[1], u),
                ooa.addr16[2], oa->addr16[2], u),
                ooa.addr16[3], oa->addr16[3], u),
                ooa.addr16[4], oa->addr16[4], u),
                ooa.addr16[5], oa->addr16[5], u),
                ooa.addr16[6], oa->addr16[6], u),
                ooa.addr16[7], oa->addr16[7], u);
            break;
#endif /* INET6 */
      }
}

void
#ifdef __FreeBSD__
pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af,
#else
pf_send_tcp(const struct pf_rule *r, sa_family_t af,
#endif
    const struct pf_addr *saddr, const struct pf_addr *daddr,
    u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
    u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
    struct ether_header *eh, struct ifnet *ifp)
{
      struct mbuf *m;
      int          len = 0, tlen;         /* make the compiler happy */
#ifdef INET
      struct ip   *h = NULL;        /* make the compiler happy */
#endif /* INET */
#ifdef INET6
      struct ip6_hdr    *h6 = NULL;       /* make the compiler happy */
#endif /* INET6 */
      struct tcphdr     *th = NULL;       /* make the compiler happy */
      char *opt;

      /* maximum segment size tcp option */
      tlen = sizeof(struct tcphdr);
      if (mss)
            tlen += 4;

      switch (af) {
#ifdef INET
      case AF_INET:
            len = sizeof(struct ip) + tlen;
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            len = sizeof(struct ip6_hdr) + tlen;
            break;
#endif /* INET6 */
      }

      /* create outgoing mbuf */
      m = m_gethdr(M_DONTWAIT, MT_HEADER);
      if (m == NULL)
            return;
#ifdef __FreeBSD__
#ifdef MAC
      if (replyto)
            mac_create_mbuf_netlayer(replyto, m);
      else
            mac_create_mbuf_from_firewall(m);
#else
      (void)replyto;
#endif
#endif
      if (tag) {
#ifdef __FreeBSD__
            m->m_flags |= M_SKIP_FIREWALL;
#else
            struct m_tag      *mtag;

            mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
            if (mtag == NULL) {
                  m_freem(m);
                  return;
            }
            m_tag_prepend(m, mtag);
#endif
      }
#ifdef ALTQ
      if (r != NULL && r->qid) {
            struct m_tag      *mtag;
            struct altq_tag *atag;

            mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
            if (mtag != NULL) {
                  atag = (struct altq_tag *)(mtag + 1);
                  atag->qid = r->qid;
                  /* add hints for ecn */
                  atag->af = af;
                  atag->hdr = mtod(m, struct ip *);
                  m_tag_prepend(m, mtag);
            }
      }
#endif /* ALTQ */
      m->m_data += max_linkhdr;
      m->m_pkthdr.len = m->m_len = len;
      m->m_pkthdr.rcvif = NULL;
      bzero(m->m_data, len);
      switch (af) {
#ifdef INET
      case AF_INET:
            h = mtod(m, struct ip *);

            /* IP header fields included in the TCP checksum */
            h->ip_p = IPPROTO_TCP;
            h->ip_len = htons(tlen);
            h->ip_src.s_addr = saddr->v4.s_addr;
            h->ip_dst.s_addr = daddr->v4.s_addr;

            th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            h6 = mtod(m, struct ip6_hdr *);

            /* IP header fields included in the TCP checksum */
            h6->ip6_nxt = IPPROTO_TCP;
            h6->ip6_plen = htons(tlen);
            memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
            memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));

            th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
            break;
#endif /* INET6 */
      }

      /* TCP header */
      th->th_sport = sport;
      th->th_dport = dport;
      th->th_seq = htonl(seq);
      th->th_ack = htonl(ack);
      th->th_off = tlen >> 2;
      th->th_flags = flags;
      th->th_win = htons(win);

      if (mss) {
            opt = (char *)(th + 1);
            opt[0] = TCPOPT_MAXSEG;
            opt[1] = 4;
            HTONS(mss);
            bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
      }

      switch (af) {
#ifdef INET
      case AF_INET:
            /* TCP checksum */
            th->th_sum = in_cksum(m, len);

            /* Finish the IP header */
            h->ip_v = 4;
            h->ip_hl = sizeof(*h) >> 2;
            h->ip_tos = IPTOS_LOWDELAY;
#ifdef __FreeBSD__
            h->ip_off = path_mtu_discovery ? IP_DF : 0;
            h->ip_len = len;
#else
            h->ip_off = htons(ip_mtudisc ? IP_DF : 0);
            h->ip_len = htons(len);
#endif
            h->ip_ttl = ttl ? ttl : ip_defttl;
            h->ip_sum = 0;
            if (eh == NULL) {
#ifdef __FreeBSD__
                  PF_UNLOCK();
                  ip_output(m, (void *)NULL, (void *)NULL, 0,
                      (void *)NULL, (void *)NULL);
                  PF_LOCK();
#else /* ! __FreeBSD__ */
                  ip_output(m, (void *)NULL, (void *)NULL, 0,
                      (void *)NULL, (void *)NULL);
#endif
            } else {
                  struct route             ro;
                  struct rtentry           rt;
                  struct ether_header     *e = (void *)ro.ro_dst.sa_data;

                  if (ifp == NULL) {
                        m_freem(m);
                        return;
                  }
                  rt.rt_ifp = ifp;
                  ro.ro_rt = &rt;
                  ro.ro_dst.sa_len = sizeof(ro.ro_dst);
                  ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
                  bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
                  bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
                  e->ether_type = eh->ether_type;
#ifdef __FreeBSD__
                  PF_UNLOCK();
                  /* XXX_IMPORT: later */
                  ip_output(m, (void *)NULL, &ro, 0,
                      (void *)NULL, (void *)NULL);
                  PF_LOCK();
#else /* ! __FreeBSD__ */
                  ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER,
                      (void *)NULL, (void *)NULL);
#endif
            }
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            /* TCP checksum */
            th->th_sum = in6_cksum(m, IPPROTO_TCP,
                sizeof(struct ip6_hdr), tlen);

            h6->ip6_vfc |= IPV6_VERSION;
            h6->ip6_hlim = IPV6_DEFHLIM;

#ifdef __FreeBSD__
            PF_UNLOCK();
            ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
            PF_LOCK();
#else
            ip6_output(m, NULL, NULL, 0, NULL, NULL);
#endif
            break;
#endif /* INET6 */
      }
}

void
pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
    struct pf_rule *r)
{
#ifdef ALTQ
      struct m_tag      *mtag;
#endif
      struct mbuf *m0;
#ifdef __FreeBSD__
      struct ip *ip;
#endif

#ifdef __FreeBSD__
      m0 = m_copypacket(m, M_DONTWAIT);
      if (m0 == NULL)
            return;
      m0->m_flags |= M_SKIP_FIREWALL;
#else
      mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
      if (mtag == NULL)
            return;
      m0 = m_copy(m, 0, M_COPYALL);
      if (m0 == NULL) {
            m_tag_free(mtag);
            return;
      }
      m_tag_prepend(m0, mtag);
#endif

#ifdef ALTQ
      if (r->qid) {
            struct altq_tag *atag;

            mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
            if (mtag != NULL) {
                  atag = (struct altq_tag *)(mtag + 1);
                  atag->qid = r->qid;
                  /* add hints for ecn */
                  atag->af = af;
                  atag->hdr = mtod(m0, struct ip *);
                  m_tag_prepend(m0, mtag);
            }
      }
#endif /* ALTQ */

      switch (af) {
#ifdef INET
      case AF_INET:
#ifdef __FreeBSD__
            /* icmp_error() expects host byte ordering */
            ip = mtod(m0, struct ip *);
            NTOHS(ip->ip_len);
            NTOHS(ip->ip_off);
            PF_UNLOCK();
            icmp_error(m0, type, code, 0, 0);
            PF_LOCK();
#else
            icmp_error(m0, type, code, 0, (void *)NULL);
#endif
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
#ifdef __FreeBSD__
            PF_UNLOCK();
#endif
            icmp6_error(m0, type, code, 0);
#ifdef __FreeBSD__
            PF_LOCK();
#endif
            break;
#endif /* INET6 */
      }
}

/*
 * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
 * If n is 0, they match if they are equal. If n is != 0, they match if they
 * are different.
 */
int
pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
    struct pf_addr *b, sa_family_t af)
{
      int   match = 0;

      switch (af) {
#ifdef INET
      case AF_INET:
            if ((a->addr32[0] & m->addr32[0]) ==
                (b->addr32[0] & m->addr32[0]))
                  match++;
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            if (((a->addr32[0] & m->addr32[0]) ==
                 (b->addr32[0] & m->addr32[0])) &&
                ((a->addr32[1] & m->addr32[1]) ==
                 (b->addr32[1] & m->addr32[1])) &&
                ((a->addr32[2] & m->addr32[2]) ==
                 (b->addr32[2] & m->addr32[2])) &&
                ((a->addr32[3] & m->addr32[3]) ==
                 (b->addr32[3] & m->addr32[3])))
                  match++;
            break;
#endif /* INET6 */
      }
      if (match) {
            if (n)
                  return (0);
            else
                  return (1);
      } else {
            if (n)
                  return (1);
            else
                  return (0);
      }
}

int
pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
{
      switch (op) {
      case PF_OP_IRG:
            return ((p > a1) && (p < a2));
      case PF_OP_XRG:
            return ((p < a1) || (p > a2));
      case PF_OP_RRG:
            return ((p >= a1) && (p <= a2));
      case PF_OP_EQ:
            return (p == a1);
      case PF_OP_NE:
            return (p != a1);
      case PF_OP_LT:
            return (p < a1);
      case PF_OP_LE:
            return (p <= a1);
      case PF_OP_GT:
            return (p > a1);
      case PF_OP_GE:
            return (p >= a1);
      }
      return (0); /* never reached */
}

int
pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
{
      NTOHS(a1);
      NTOHS(a2);
      NTOHS(p);
      return (pf_match(op, a1, a2, p));
}

int
pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
{
      if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
            return (0);
      return (pf_match(op, a1, a2, u));
}

int
pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
{
      if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
            return (0);
      return (pf_match(op, a1, a2, g));
}

struct pf_tag *
pf_get_tag(struct mbuf *m)
{
      struct m_tag      *mtag;

      if ((mtag = m_tag_find(m, PACKET_TAG_PF_TAG, NULL)) != NULL)
            return ((struct pf_tag *)(mtag + 1));
      else
            return (NULL);
}

int
pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_tag **pftag, int *tag)
{
      if (*tag == -1) { /* find mbuf tag */
            *pftag = pf_get_tag(m);
            if (*pftag != NULL)
                  *tag = (*pftag)->tag;
            else
                  *tag = 0;
      }

      return ((!r->match_tag_not && r->match_tag == *tag) ||
          (r->match_tag_not && r->match_tag != *tag));
}

int
pf_tag_packet(struct mbuf *m, struct pf_tag *pftag, int tag)
{
      struct m_tag      *mtag;

      if (tag <= 0)
            return (0);

      if (pftag == NULL) {
            mtag = m_tag_get(PACKET_TAG_PF_TAG, sizeof(*pftag), M_NOWAIT);
            if (mtag == NULL)
                  return (1);
            ((struct pf_tag *)(mtag + 1))->tag = tag;
            m_tag_prepend(m, mtag);
      } else
            pftag->tag = tag;

      return (0);
}

static void
pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
    struct pf_rule **r, struct pf_rule **a)
{
      struct pf_anchor_stackframe   *f;

      if (*depth >= sizeof(pf_anchor_stack) /
          sizeof(pf_anchor_stack[0])) {
            printf("pf_step_into_anchor: stack overflow\n");
            *r = TAILQ_NEXT(*r, entries);
            return;
      } else if (*depth == 0 && a != NULL)
            *a = *r;
      f = pf_anchor_stack + (*depth)++;
      f->rs = *rs;
      f->r = *r;
      if ((*r)->anchor_wildcard) {
            f->parent = &(*r)->anchor->children;
            if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
                NULL) {
                  *r = NULL;
                  return;
            }
            *rs = &f->child->ruleset;
      } else {
            f->parent = NULL;
            f->child = NULL;
            *rs = &(*r)->anchor->ruleset;
      }
      *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
}

static void
pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
    struct pf_rule **r, struct pf_rule **a)
{
      struct pf_anchor_stackframe   *f;

      do {
            if (*depth <= 0)
                  break;
            f = pf_anchor_stack + *depth - 1;
            if (f->parent != NULL && f->child != NULL) {
                  f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
                  if (f->child != NULL) {
                        *rs = &f->child->ruleset;
                        *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
                        if (*r == NULL)
                              continue;
                        else
                              break;
                  }
            }
            (*depth)--;
            if (*depth == 0 && a != NULL)
                  *a = NULL;
            *rs = f->rs;
            *r = TAILQ_NEXT(f->r, entries);
      } while (*r == NULL);
}

#ifdef INET6
void
pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
    struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
{
      switch (af) {
#ifdef INET
      case AF_INET:
            naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
            ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
            break;
#endif /* INET */
      case AF_INET6:
            naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
            ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
            naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
            ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
            naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
            ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
            naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
            ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
            break;
      }
}

void
pf_addr_inc(struct pf_addr *addr, sa_family_t af)
{
      switch (af) {
#ifdef INET
      case AF_INET:
            addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
            break;
#endif /* INET */
      case AF_INET6:
            if (addr->addr32[3] == 0xffffffff) {
                  addr->addr32[3] = 0;
                  if (addr->addr32[2] == 0xffffffff) {
                        addr->addr32[2] = 0;
                        if (addr->addr32[1] == 0xffffffff) {
                              addr->addr32[1] = 0;
                              addr->addr32[0] =
                                  htonl(ntohl(addr->addr32[0]) + 1);
                        } else
                              addr->addr32[1] =
                                  htonl(ntohl(addr->addr32[1]) + 1);
                  } else
                        addr->addr32[2] =
                            htonl(ntohl(addr->addr32[2]) + 1);
            } else
                  addr->addr32[3] =
                      htonl(ntohl(addr->addr32[3]) + 1);
            break;
      }
}
#endif /* INET6 */

#define mix(a,b,c) \
      do {                          \
            a -= b; a -= c; a ^= (c >> 13);     \
            b -= c; b -= a; b ^= (a << 8);      \
            c -= a; c -= b; c ^= (b >> 13);     \
            a -= b; a -= c; a ^= (c >> 12);     \
            b -= c; b -= a; b ^= (a << 16);     \
            c -= a; c -= b; c ^= (b >> 5);      \
            a -= b; a -= c; a ^= (c >> 3);      \
            b -= c; b -= a; b ^= (a << 10);     \
            c -= a; c -= b; c ^= (b >> 15);     \
      } while (0)

/*
 * hash function based on bridge_hash in if_bridge.c
 */
void
pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
    struct pf_poolhashkey *key, sa_family_t af)
{
      u_int32_t   a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];

      switch (af) {
#ifdef INET
      case AF_INET:
            a += inaddr->addr32[0];
            b += key->key32[1];
            mix(a, b, c);
            hash->addr32[0] = c + key->key32[2];
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            a += inaddr->addr32[0];
            b += inaddr->addr32[2];
            mix(a, b, c);
            hash->addr32[0] = c;
            a += inaddr->addr32[1];
            b += inaddr->addr32[3];
            c += key->key32[1];
            mix(a, b, c);
            hash->addr32[1] = c;
            a += inaddr->addr32[2];
            b += inaddr->addr32[1];
            c += key->key32[2];
            mix(a, b, c);
            hash->addr32[2] = c;
            a += inaddr->addr32[3];
            b += inaddr->addr32[0];
            c += key->key32[3];
            mix(a, b, c);
            hash->addr32[3] = c;
            break;
#endif /* INET6 */
      }
}

int
pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
    struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
{
      unsigned char            hash[16];
      struct pf_pool          *rpool = &r->rpool;
      struct pf_addr          *raddr = &rpool->cur->addr.v.a.addr;
      struct pf_addr          *rmask = &rpool->cur->addr.v.a.mask;
      struct pf_pooladdr      *acur = rpool->cur;
      struct pf_src_node       k;

      if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
          (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
            k.af = af;
            PF_ACPY(&k.addr, saddr, af);
            if (r->rule_flag & PFRULE_RULESRCTRACK ||
                r->rpool.opts & PF_POOL_STICKYADDR)
                  k.rule.ptr = r;
            else
                  k.rule.ptr = NULL;
            pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
            *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
            if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
                  PF_ACPY(naddr, &(*sn)->raddr, af);
                  if (pf_status.debug >= PF_DEBUG_MISC) {
                        printf("pf_map_addr: src tracking maps ");
                        pf_print_host(&k.addr, 0, af);
                        printf(" to ");
                        pf_print_host(naddr, 0, af);
                        printf("\n");
                  }
                  return (0);
            }
      }

      if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
            return (1);
      if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
            switch (af) {
#ifdef INET
            case AF_INET:
                  if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
                      (rpool->opts & PF_POOL_TYPEMASK) !=
                      PF_POOL_ROUNDROBIN)
                        return (1);
                   raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
                   rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
                  break;
#endif /* INET */
#ifdef INET6
            case AF_INET6:
                  if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
                      (rpool->opts & PF_POOL_TYPEMASK) !=
                      PF_POOL_ROUNDROBIN)
                        return (1);
                  raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
                  rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
                  break;
#endif /* INET6 */
            }
      } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
            if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
                  return (1); /* unsupported */
      } else {
            raddr = &rpool->cur->addr.v.a.addr;
            rmask = &rpool->cur->addr.v.a.mask;
      }

      switch (rpool->opts & PF_POOL_TYPEMASK) {
      case PF_POOL_NONE:
            PF_ACPY(naddr, raddr, af);
            break;
      case PF_POOL_BITMASK:
            PF_POOLMASK(naddr, raddr, rmask, saddr, af);
            break;
      case PF_POOL_RANDOM:
            if (init_addr != NULL && PF_AZERO(init_addr, af)) {
                  switch (af) {
#ifdef INET
                  case AF_INET:
                        rpool->counter.addr32[0] = htonl(arc4random());
                        break;
#endif /* INET */
#ifdef INET6
                  case AF_INET6:
                        if (rmask->addr32[3] != 0xffffffff)
                              rpool->counter.addr32[3] =
                                  htonl(arc4random());
                        else
                              break;
                        if (rmask->addr32[2] != 0xffffffff)
                              rpool->counter.addr32[2] =
                                  htonl(arc4random());
                        else
                              break;
                        if (rmask->addr32[1] != 0xffffffff)
                              rpool->counter.addr32[1] =
                                  htonl(arc4random());
                        else
                              break;
                        if (rmask->addr32[0] != 0xffffffff)
                              rpool->counter.addr32[0] =
                                  htonl(arc4random());
                        break;
#endif /* INET6 */
                  }
                  PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
                  PF_ACPY(init_addr, naddr, af);

            } else {
                  PF_AINC(&rpool->counter, af);
                  PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
            }
            break;
      case PF_POOL_SRCHASH:
            pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
            PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
            break;
      case PF_POOL_ROUNDROBIN:
            if (rpool->cur->addr.type == PF_ADDR_TABLE) {
                  if (!pfr_pool_get(rpool->cur->addr.p.tbl,
                      &rpool->tblidx, &rpool->counter,
                      &raddr, &rmask, af))
                        goto get_addr;
            } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
                  if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
                      &rpool->tblidx, &rpool->counter,
                      &raddr, &rmask, af))
                        goto get_addr;
            } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
                  goto get_addr;

      try_next:
            if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
                  rpool->cur = TAILQ_FIRST(&rpool->list);
            if (rpool->cur->addr.type == PF_ADDR_TABLE) {
                  rpool->tblidx = -1;
                  if (pfr_pool_get(rpool->cur->addr.p.tbl,
                      &rpool->tblidx, &rpool->counter,
                      &raddr, &rmask, af)) {
                        /* table contains no address of type 'af' */
                        if (rpool->cur != acur)
                              goto try_next;
                        return (1);
                  }
            } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
                  rpool->tblidx = -1;
                  if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
                      &rpool->tblidx, &rpool->counter,
                      &raddr, &rmask, af)) {
                        /* table contains no address of type 'af' */
                        if (rpool->cur != acur)
                              goto try_next;
                        return (1);
                  }
            } else {
                  raddr = &rpool->cur->addr.v.a.addr;
                  rmask = &rpool->cur->addr.v.a.mask;
                  PF_ACPY(&rpool->counter, raddr, af);
            }

      get_addr:
            PF_ACPY(naddr, &rpool->counter, af);
            if (init_addr != NULL && PF_AZERO(init_addr, af))
                  PF_ACPY(init_addr, naddr, af);
            PF_AINC(&rpool->counter, af);
            break;
      }
      if (*sn != NULL)
            PF_ACPY(&(*sn)->raddr, naddr, af);

      if (pf_status.debug >= PF_DEBUG_MISC &&
          (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
            printf("pf_map_addr: selected address ");
            pf_print_host(naddr, 0, af);
            printf("\n");
      }

      return (0);
}

int
pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
    struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
    struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
    struct pf_src_node **sn)
{
      struct pf_state         key;
      struct pf_addr          init_addr;
      u_int16_t         cut;

      bzero(&init_addr, sizeof(init_addr));
      if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
            return (1);

      if (proto == IPPROTO_ICMP) {
            low = 1;
            high = 65535;
      }

      do {
            key.af = af;
            key.proto = proto;
            PF_ACPY(&key.ext.addr, daddr, key.af);
            PF_ACPY(&key.gwy.addr, naddr, key.af);
            key.ext.port = dport;

            /*
             * port search; start random, step;
             * similar 2 portloop in in_pcbbind
             */
            if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
                proto == IPPROTO_ICMP)) {
                  key.gwy.port = dport;
                  if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
                        return (0);
            } else if (low == 0 && high == 0) {
                  key.gwy.port = *nport;
                  if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
                        return (0);
            } else if (low == high) {
                  key.gwy.port = htons(low);
                  if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) {
                        *nport = htons(low);
                        return (0);
                  }
            } else {
                  u_int16_t tmp;

                  if (low > high) {
                        tmp = low;
                        low = high;
                        high = tmp;
                  }
                  /* low < high */
                  cut = htonl(arc4random()) % (1 + high - low) + low;
                  /* low <= cut <= high */
                  for (tmp = cut; tmp <= high; ++(tmp)) {
                        key.gwy.port = htons(tmp);
                        if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
                            NULL) {
                              *nport = htons(tmp);
                              return (0);
                        }
                  }
                  for (tmp = cut - 1; tmp >= low; --(tmp)) {
                        key.gwy.port = htons(tmp);
                        if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
                            NULL) {
                              *nport = htons(tmp);
                              return (0);
                        }
                  }
            }

            switch (r->rpool.opts & PF_POOL_TYPEMASK) {
            case PF_POOL_RANDOM:
            case PF_POOL_ROUNDROBIN:
                  if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
                        return (1);
                  break;
            case PF_POOL_NONE:
            case PF_POOL_SRCHASH:
            case PF_POOL_BITMASK:
            default:
                  return (1);
            }
      } while (! PF_AEQ(&init_addr, naddr, af) );

      return (1);                         /* none available */
}

struct pf_rule *
pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
    int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
    struct pf_addr *daddr, u_int16_t dport, int rs_num)
{
      struct pf_rule          *r, *rm = NULL;
      struct pf_ruleset *ruleset = NULL;
      struct pf_tag           *pftag = NULL;
      int                tag = -1;
      int                asd = 0;

      r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
      while (r && rm == NULL) {
            struct pf_rule_addr     *src = NULL, *dst = NULL;
            struct pf_addr_wrap     *xdst = NULL;

            if (r->action == PF_BINAT && direction == PF_IN) {
                  src = &r->dst;
                  if (r->rpool.cur != NULL)
                        xdst = &r->rpool.cur->addr;
            } else {
                  src = &r->src;
                  dst = &r->dst;
            }

            r->evaluations++;
            if (r->kif != NULL &&
                (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
                  r = r->skip[PF_SKIP_IFP].ptr;
            else if (r->direction && r->direction != direction)
                  r = r->skip[PF_SKIP_DIR].ptr;
            else if (r->af && r->af != pd->af)
                  r = r->skip[PF_SKIP_AF].ptr;
            else if (r->proto && r->proto != pd->proto)
                  r = r->skip[PF_SKIP_PROTO].ptr;
            else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->neg))
                  r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
                      PF_SKIP_DST_ADDR].ptr;
            else if (src->port_op && !pf_match_port(src->port_op,
                src->port[0], src->port[1], sport))
                  r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
                      PF_SKIP_DST_PORT].ptr;
            else if (dst != NULL &&
                PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg))
                  r = r->skip[PF_SKIP_DST_ADDR].ptr;
            else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0))
                  r = TAILQ_NEXT(r, entries);
            else if (dst != NULL && dst->port_op &&
                !pf_match_port(dst->port_op, dst->port[0],
                dst->port[1], dport))
                  r = r->skip[PF_SKIP_DST_PORT].ptr;
            else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
                  r = TAILQ_NEXT(r, entries);
            else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
                IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
                off, pd->hdr.tcp), r->os_fingerprint)))
                  r = TAILQ_NEXT(r, entries);
            else {
                  if (r->tag)
                        tag = r->tag;
                  if (r->anchor == NULL) {
                        rm = r;
                  } else
                        pf_step_into_anchor(&asd, &ruleset, rs_num, &r, NULL);
            }
            if (r == NULL)
                  pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, NULL);
      }
      if (pf_tag_packet(m, pftag, tag))
            return (NULL);
      if (rm != NULL && (rm->action == PF_NONAT ||
          rm->action == PF_NORDR || rm->action == PF_NOBINAT))
            return (NULL);
      return (rm);
}

struct pf_rule *
pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
    struct pfi_kif *kif, struct pf_src_node **sn,
    struct pf_addr *saddr, u_int16_t sport,
    struct pf_addr *daddr, u_int16_t dport,
    struct pf_addr *naddr, u_int16_t *nport)
{
      struct pf_rule    *r = NULL;

      if (direction == PF_OUT) {
            r = pf_match_translation(pd, m, off, direction, kif, saddr,
                sport, daddr, dport, PF_RULESET_BINAT);
            if (r == NULL)
                  r = pf_match_translation(pd, m, off, direction, kif,
                      saddr, sport, daddr, dport, PF_RULESET_NAT);
      } else {
            r = pf_match_translation(pd, m, off, direction, kif, saddr,
                sport, daddr, dport, PF_RULESET_RDR);
            if (r == NULL)
                  r = pf_match_translation(pd, m, off, direction, kif,
                      saddr, sport, daddr, dport, PF_RULESET_BINAT);
      }

      if (r != NULL) {
            switch (r->action) {
            case PF_NONAT:
            case PF_NOBINAT:
            case PF_NORDR:
                  return (NULL);
            case PF_NAT:
                  if (pf_get_sport(pd->af, pd->proto, r, saddr,
                      daddr, dport, naddr, nport, r->rpool.proxy_port[0],
                      r->rpool.proxy_port[1], sn)) {
                        DPFPRINTF(PF_DEBUG_MISC,
                            ("pf: NAT proxy port allocation "
                            "(%u-%u) failed\n",
                            r->rpool.proxy_port[0],
                            r->rpool.proxy_port[1]));
                        return (NULL);
                  }
                  break;
            case PF_BINAT:
                  switch (direction) {
                  case PF_OUT:
                        if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
                              switch (pd->af) {
#ifdef INET
                              case AF_INET:
                                    if (r->rpool.cur->addr.p.dyn->
                                        pfid_acnt4 < 1)
                                          return (NULL);
                                    PF_POOLMASK(naddr,
                                        &r->rpool.cur->addr.p.dyn->
                                        pfid_addr4,
                                        &r->rpool.cur->addr.p.dyn->
                                        pfid_mask4,
                                        saddr, AF_INET);
                                    break;
#endif /* INET */
#ifdef INET6
                              case AF_INET6:
                                    if (r->rpool.cur->addr.p.dyn->
                                        pfid_acnt6 < 1)
                                          return (NULL);
                                    PF_POOLMASK(naddr,
                                        &r->rpool.cur->addr.p.dyn->
                                        pfid_addr6,
                                        &r->rpool.cur->addr.p.dyn->
                                        pfid_mask6,
                                        saddr, AF_INET6);
                                    break;
#endif /* INET6 */
                              }
                        } else
                              PF_POOLMASK(naddr,
                                  &r->rpool.cur->addr.v.a.addr,
                                  &r->rpool.cur->addr.v.a.mask,
                                  saddr, pd->af);
                        break;
                  case PF_IN:
                        if (r->src.addr.type == PF_ADDR_DYNIFTL) {
                              switch (pd->af) {
#ifdef INET
                              case AF_INET:
                                    if (r->src.addr.p.dyn->
                                        pfid_acnt4 < 1)
                                          return (NULL);
                                    PF_POOLMASK(naddr,
                                        &r->src.addr.p.dyn->
                                        pfid_addr4,
                                        &r->src.addr.p.dyn->
                                        pfid_mask4,
                                        daddr, AF_INET);
                                    break;
#endif /* INET */
#ifdef INET6
                              case AF_INET6:
                                    if (r->src.addr.p.dyn->
                                        pfid_acnt6 < 1)
                                          return (NULL);
                                    PF_POOLMASK(naddr,
                                        &r->src.addr.p.dyn->
                                        pfid_addr6,
                                        &r->src.addr.p.dyn->
                                        pfid_mask6,
                                        daddr, AF_INET6);
                                    break;
#endif /* INET6 */
                              }
                        } else
                              PF_POOLMASK(naddr,
                                  &r->src.addr.v.a.addr,
                                  &r->src.addr.v.a.mask, daddr,
                                  pd->af);
                        break;
                  }
                  break;
            case PF_RDR: {
                  if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
                        return (NULL);
                  if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
                      PF_POOL_BITMASK)
                        PF_POOLMASK(naddr, naddr,
                            &r->rpool.cur->addr.v.a.mask, daddr,
                            pd->af);

                  if (r->rpool.proxy_port[1]) {
                        u_int32_t   tmp_nport;

                        tmp_nport = ((ntohs(dport) -
                            ntohs(r->dst.port[0])) %
                            (r->rpool.proxy_port[1] -
                            r->rpool.proxy_port[0] + 1)) +
                            r->rpool.proxy_port[0];

                        /* wrap around if necessary */
                        if (tmp_nport > 65535)
                              tmp_nport -= 65535;
                        *nport = htons((u_int16_t)tmp_nport);
                  } else if (r->rpool.proxy_port[0])
                        *nport = htons(r->rpool.proxy_port[0]);
                  break;
            }
            default:
                  return (NULL);
            }
      }

      return (r);
}

int
#ifdef __FreeBSD__
pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd,
    struct inpcb *inp_arg)
#else
pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd)
#endif
{
      struct pf_addr          *saddr, *daddr;
      u_int16_t          sport, dport;
#ifdef __FreeBSD__
      struct inpcbinfo  *pi;
#else
      struct inpcbtable *tb;
#endif
      struct inpcb            *inp;

      *uid = UID_MAX;
      *gid = GID_MAX;
#ifdef __FreeBSD__
      if (inp_arg != NULL) {
            INP_LOCK_ASSERT(inp_arg);
            if (inp_arg->inp_socket) {
                  *uid = inp_arg->inp_socket->so_cred->cr_uid;
                  *gid = inp_arg->inp_socket->so_cred->cr_groups[0];
                  return (1);
            } else
                  return (0);
      }
#endif
      switch (pd->proto) {
      case IPPROTO_TCP:
            sport = pd->hdr.tcp->th_sport;
            dport = pd->hdr.tcp->th_dport;
#ifdef __FreeBSD__
            pi = &tcbinfo;
#else
            tb = &tcbtable;
#endif
            break;
      case IPPROTO_UDP:
            sport = pd->hdr.udp->uh_sport;
            dport = pd->hdr.udp->uh_dport;
#ifdef __FreeBSD__
            pi = &udbinfo;
#else
            tb = &udbtable;
#endif
            break;
      default:
            return (0);
      }
      if (direction == PF_IN) {
            saddr = pd->src;
            daddr = pd->dst;
      } else {
            u_int16_t   p;

            p = sport;
            sport = dport;
            dport = p;
            saddr = pd->dst;
            daddr = pd->src;
      }
      switch (pd->af) {
#ifdef INET
      case AF_INET:
#ifdef __FreeBSD__
            INP_INFO_RLOCK(pi);     /* XXX LOR */
            inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
                  dport, 0, NULL);
            if (inp == NULL) {
                  inp = in_pcblookup_hash(pi, saddr->v4, sport,
                     daddr->v4, dport, INPLOOKUP_WILDCARD, NULL);
                  if(inp == NULL) {
                        INP_INFO_RUNLOCK(pi);
                        return (0);
                  }
            }
#else
            inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport);
            if (inp == NULL) {
                  inp = in_pcblookup_listen(tb, daddr->v4, dport, 0);
                  if (inp == NULL)
                        return (0);
            }
#endif
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
#ifdef __FreeBSD__
            INP_INFO_RLOCK(pi);
            inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
                  &daddr->v6, dport, 0, NULL);
            if (inp == NULL) {
                  inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
                  &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
                  if (inp == NULL) {
                        INP_INFO_RUNLOCK(pi);
                        return (0);
                  }
            }
#else
            inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6,
                dport);
            if (inp == NULL) {
                  inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0);
                  if (inp == NULL)
                        return (0);
            }
#endif
            break;
#endif /* INET6 */

      default:
            return (0);
      }
#ifdef __FreeBSD__
      INP_LOCK(inp);
      if ((inp->inp_socket == NULL) || (inp->inp_socket->so_cred == NULL)) {
            INP_UNLOCK(inp);
            INP_INFO_RUNLOCK(pi);
            return (0);
      }
      *uid = inp->inp_socket->so_cred->cr_uid;
      *gid = inp->inp_socket->so_cred->cr_groups[0];
      INP_UNLOCK(inp);
      INP_INFO_RUNLOCK(pi);
#else
      *uid = inp->inp_socket->so_euid;
      *gid = inp->inp_socket->so_egid;
#endif
      return (1);
}

u_int8_t
pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
{
      int          hlen;
      u_int8_t     hdr[60];
      u_int8_t    *opt, optlen;
      u_int8_t     wscale = 0;

      hlen = th_off << 2;           /* hlen <= sizeof(hdr) */
      if (hlen <= sizeof(struct tcphdr))
            return (0);
      if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
            return (0);
      opt = hdr + sizeof(struct tcphdr);
      hlen -= sizeof(struct tcphdr);
      while (hlen >= 3) {
            switch (*opt) {
            case TCPOPT_EOL:
            case TCPOPT_NOP:
                  ++opt;
                  --hlen;
                  break;
            case TCPOPT_WINDOW:
                  wscale = opt[2];
                  if (wscale > TCP_MAX_WINSHIFT)
                        wscale = TCP_MAX_WINSHIFT;
                  wscale |= PF_WSCALE_FLAG;
                  /* FALLTHROUGH */
            default:
                  optlen = opt[1];
                  if (optlen < 2)
                        optlen = 2;
                  hlen -= optlen;
                  opt += optlen;
                  break;
            }
      }
      return (wscale);
}

u_int16_t
pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
{
      int          hlen;
      u_int8_t     hdr[60];
      u_int8_t    *opt, optlen;
      u_int16_t    mss = tcp_mssdflt;

      hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
      if (hlen <= sizeof(struct tcphdr))
            return (0);
      if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
            return (0);
      opt = hdr + sizeof(struct tcphdr);
      hlen -= sizeof(struct tcphdr);
      while (hlen >= TCPOLEN_MAXSEG) {
            switch (*opt) {
            case TCPOPT_EOL:
            case TCPOPT_NOP:
                  ++opt;
                  --hlen;
                  break;
            case TCPOPT_MAXSEG:
                  bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
                  NTOHS(mss);
                  /* FALLTHROUGH */
            default:
                  optlen = opt[1];
                  if (optlen < 2)
                        optlen = 2;
                  hlen -= optlen;
                  opt += optlen;
                  break;
            }
      }
      return (mss);
}

u_int16_t
pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
{
#ifdef INET
      struct sockaddr_in      *dst;
      struct route             ro;
#endif /* INET */
#ifdef INET6
      struct sockaddr_in6     *dst6;
      struct route_in6   ro6;
#endif /* INET6 */
      struct rtentry          *rt = NULL;
      int                hlen = 0;  /* make the compiler happy */
      u_int16_t          mss = tcp_mssdflt;

      switch (af) {
#ifdef INET
      case AF_INET:
            hlen = sizeof(struct ip);
            bzero(&ro, sizeof(ro));
            dst = (struct sockaddr_in *)&ro.ro_dst;
            dst->sin_family = AF_INET;
            dst->sin_len = sizeof(*dst);
            dst->sin_addr = addr->v4;
#ifdef __FreeBSD__
#ifdef RTF_PRCLONING
            rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
#else /* !RTF_PRCLONING */
            rtalloc_ign(&ro, RTF_CLONING);
#endif
#else /* ! __FreeBSD__ */
            rtalloc_noclone(&ro, NO_CLONING);
#endif
            rt = ro.ro_rt;
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            hlen = sizeof(struct ip6_hdr);
            bzero(&ro6, sizeof(ro6));
            dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
            dst6->sin6_family = AF_INET6;
            dst6->sin6_len = sizeof(*dst6);
            dst6->sin6_addr = addr->v6;
#ifdef __FreeBSD__
#ifdef RTF_PRCLONING
            rtalloc_ign((struct route *)&ro6,
                (RTF_CLONING | RTF_PRCLONING));
#else /* !RTF_PRCLONING */
            rtalloc_ign((struct route *)&ro6, RTF_CLONING);
#endif
#else /* ! __FreeBSD__ */
            rtalloc_noclone((struct route *)&ro6, NO_CLONING);
#endif
            rt = ro6.ro_rt;
            break;
#endif /* INET6 */
      }

      if (rt && rt->rt_ifp) {
            mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
            mss = max(tcp_mssdflt, mss);
            RTFREE(rt);
      }
      mss = min(mss, offer);
      mss = max(mss, 64);           /* sanity - at least max opt space */
      return (mss);
}

void
pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
{
      struct pf_rule *r = s->rule.ptr;

      s->rt_kif = NULL;
      if (!r->rt || r->rt == PF_FASTROUTE)
            return;
      switch (s->af) {
#ifdef INET
      case AF_INET:
            pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
                &s->nat_src_node);
            s->rt_kif = r->rpool.cur->kif;
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
                &s->nat_src_node);
            s->rt_kif = r->rpool.cur->kif;
            break;
#endif /* INET6 */
      }
}

int
pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction,
    struct pfi_kif *kif, struct mbuf *m, int off, void *h,
#ifdef __FreeBSD__
    struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
    struct ifqueue *ifq, struct inpcb *inp)
#else
    struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
    struct ifqueue *ifq)
#endif
{
      struct pf_rule          *nr = NULL;
      struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
      struct tcphdr           *th = pd->hdr.tcp;
      u_int16_t          bport, nport = 0;
      sa_family_t        af = pd->af;
      int                lookup = -1;
      uid_t              uid;
      gid_t              gid;
      struct pf_rule          *r, *a = NULL;
      struct pf_ruleset *ruleset = NULL;
      struct pf_src_node      *nsn = NULL;
      u_short                  reason;
      int                rewrite = 0;
      struct pf_tag           *pftag = NULL;
      int                tag = -1;
      u_int16_t          mss = tcp_mssdflt;
      int                asd = 0;

      if (pf_check_congestion(ifq)) {
            REASON_SET(&reason, PFRES_CONGEST);
            return (PF_DROP);
      }

      r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);

      if (direction == PF_OUT) {
            bport = nport = th->th_sport;
            /* check outgoing packet for BINAT/NAT */
            if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
                saddr, th->th_sport, daddr, th->th_dport,
                &pd->naddr, &nport)) != NULL) {
                  PF_ACPY(&pd->baddr, saddr, af);
                  pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
                      &th->th_sum, &pd->naddr, nport, 0, af);
                  rewrite++;
                  if (nr->natpass)
                        r = NULL;
                  pd->nat_rule = nr;
            }
      } else {
            bport = nport = th->th_dport;
            /* check incoming packet for BINAT/RDR */
            if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
                saddr, th->th_sport, daddr, th->th_dport,
                &pd->naddr, &nport)) != NULL) {
                  PF_ACPY(&pd->baddr, daddr, af);
                  pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
                      &th->th_sum, &pd->naddr, nport, 0, af);
                  rewrite++;
                  if (nr->natpass)
                        r = NULL;
                  pd->nat_rule = nr;
            }
      }

      while (r != NULL) {
            r->evaluations++;
            if (r->kif != NULL &&
                (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
                  r = r->skip[PF_SKIP_IFP].ptr;
            else if (r->direction && r->direction != direction)
                  r = r->skip[PF_SKIP_DIR].ptr;
            else if (r->af && r->af != af)
                  r = r->skip[PF_SKIP_AF].ptr;
            else if (r->proto && r->proto != IPPROTO_TCP)
                  r = r->skip[PF_SKIP_PROTO].ptr;
            else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg))
                  r = r->skip[PF_SKIP_SRC_ADDR].ptr;
            else if (r->src.port_op && !pf_match_port(r->src.port_op,
                r->src.port[0], r->src.port[1], th->th_sport))
                  r = r->skip[PF_SKIP_SRC_PORT].ptr;
            else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg))
                  r = r->skip[PF_SKIP_DST_ADDR].ptr;
            else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
                r->dst.port[0], r->dst.port[1], th->th_dport))
                  r = r->skip[PF_SKIP_DST_PORT].ptr;
            else if (r->tos && !(r->tos & pd->tos))
                  r = TAILQ_NEXT(r, entries);
            else if (r->rule_flag & PFRULE_FRAGMENT)
                  r = TAILQ_NEXT(r, entries);
            else if ((r->flagset & th->th_flags) != r->flags)
                  r = TAILQ_NEXT(r, entries);
            else if (r->uid.op && (lookup != -1 || (lookup =
#ifdef __FreeBSD__
                pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) &&
#else
                pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
#endif
                !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
                uid))
                  r = TAILQ_NEXT(r, entries);
            else if (r->gid.op && (lookup != -1 || (lookup =
#ifdef __FreeBSD__
                pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) &&
#else
                pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
#endif
                !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
                gid))
                  r = TAILQ_NEXT(r, entries);
            else if (r->prob && r->prob <= arc4random())
                  r = TAILQ_NEXT(r, entries);
            else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
                  r = TAILQ_NEXT(r, entries);
            else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match(
                pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))
                  r = TAILQ_NEXT(r, entries);
            else {
                  if (r->tag)
                        tag = r->tag;
                  if (r->anchor == NULL) {
                        *rm = r;
                        *am = a;
                        *rsm = ruleset;
                        if ((*rm)->quick)
                              break;
                        r = TAILQ_NEXT(r, entries);
                  } else
                        pf_step_into_anchor(&asd, &ruleset,
                            PF_RULESET_FILTER, &r, &a);
            }
            if (r == NULL)
                  pf_step_out_of_anchor(&asd, &ruleset,
                      PF_RULESET_FILTER, &r, &a);
      }
      r = *rm;
      a = *am;
      ruleset = *rsm;

      REASON_SET(&reason, PFRES_MATCH);

      if (r->log) {
            if (rewrite)
                  m_copyback(m, off, sizeof(*th), (caddr_t)th);
            PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
      }

      if ((r->action == PF_DROP) &&
          ((r->rule_flag & PFRULE_RETURNRST) ||
          (r->rule_flag & PFRULE_RETURNICMP) ||
          (r->rule_flag & PFRULE_RETURN))) {
            /* undo NAT changes, if they have taken place */
            if (nr != NULL) {
                  if (direction == PF_OUT) {
                        pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
                            &th->th_sum, &pd->baddr, bport, 0, af);
                        rewrite++;
                  } else {
                        pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
                            &th->th_sum, &pd->baddr, bport, 0, af);
                        rewrite++;
                  }
            }
            if (((r->rule_flag & PFRULE_RETURNRST) ||
                (r->rule_flag & PFRULE_RETURN)) &&
                !(th->th_flags & TH_RST)) {
                  u_int32_t ack = ntohl(th->th_seq) + pd->p_len;

                  if (th->th_flags & TH_SYN)
                        ack++;
                  if (th->th_flags & TH_FIN)
                        ack++;
#ifdef __FreeBSD__
                  pf_send_tcp(m, r, af, pd->dst,
#else
                  pf_send_tcp(r, af, pd->dst,
#endif
                      pd->src, th->th_dport, th->th_sport,
                      ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
                      r->return_ttl, 1, pd->eh, kif->pfik_ifp);
            } else if ((af == AF_INET) && r->return_icmp)
                  pf_send_icmp(m, r->return_icmp >> 8,
                      r->return_icmp & 255, af, r);
            else if ((af == AF_INET6) && r->return_icmp6)
                  pf_send_icmp(m, r->return_icmp6 >> 8,
                      r->return_icmp6 & 255, af, r);
      }

      if (r->action == PF_DROP)
            return (PF_DROP);

      if (pf_tag_packet(m, pftag, tag)) {
            REASON_SET(&reason, PFRES_MEMORY);
            return (PF_DROP);
      }

      if (r->keep_state || nr != NULL ||
          (pd->flags & PFDESC_TCP_NORM)) {
            /* create new state */
            u_int16_t    len;
            struct pf_state   *s = NULL;
            struct pf_src_node *sn = NULL;

            len = pd->tot_len - off - (th->th_off << 2);

            /* check maximums */
            if (r->max_states && (r->states >= r->max_states)) {
                  pf_status.lcounters[LCNT_STATES]++;
                  REASON_SET(&reason, PFRES_MAXSTATES);
                  goto cleanup;
            }
            /* src node for flter rule */
            if ((r->rule_flag & PFRULE_SRCTRACK ||
                r->rpool.opts & PF_POOL_STICKYADDR) &&
                pf_insert_src_node(&sn, r, saddr, af) != 0) {
                  REASON_SET(&reason, PFRES_SRCLIMIT);
                  goto cleanup;
            }
            /* src node for translation rule */
            if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
                ((direction == PF_OUT &&
                pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
                (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
                  REASON_SET(&reason, PFRES_SRCLIMIT);
                  goto cleanup;
            }
            s = pool_get(&pf_state_pl, PR_NOWAIT);
            if (s == NULL) {
                  REASON_SET(&reason, PFRES_MEMORY);
cleanup:
                  if (sn != NULL && sn->states == 0 && sn->expire == 0) {
                        RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
                        pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
                        pf_status.src_nodes--;
                        pool_put(&pf_src_tree_pl, sn);
                  }
                  if (nsn != sn && nsn != NULL && nsn->states == 0 &&
                      nsn->expire == 0) {
                        RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
                        pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
                        pf_status.src_nodes--;
                        pool_put(&pf_src_tree_pl, nsn);
                  }
                  return (PF_DROP);
            }
            bzero(s, sizeof(*s));
            s->rule.ptr = r;
            s->nat_rule.ptr = nr;
            s->anchor.ptr = a;
            STATE_INC_COUNTERS(s);
            s->allow_opts = r->allow_opts;
            s->log = r->log & 2;
            s->proto = IPPROTO_TCP;
            s->direction = direction;
            s->af = af;
            if (direction == PF_OUT) {
                  PF_ACPY(&s->gwy.addr, saddr, af);
                  s->gwy.port = th->th_sport;         /* sport */
                  PF_ACPY(&s->ext.addr, daddr, af);
                  s->ext.port = th->th_dport;
                  if (nr != NULL) {
                        PF_ACPY(&s->lan.addr, &pd->baddr, af);
                        s->lan.port = bport;
                  } else {
                        PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
                        s->lan.port = s->gwy.port;
                  }
            } else {
                  PF_ACPY(&s->lan.addr, daddr, af);
                  s->lan.port = th->th_dport;
                  PF_ACPY(&s->ext.addr, saddr, af);
                  s->ext.port = th->th_sport;
                  if (nr != NULL) {
                        PF_ACPY(&s->gwy.addr, &pd->baddr, af);
                        s->gwy.port = bport;
                  } else {
                        PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
                        s->gwy.port = s->lan.port;
                  }
            }

            s->src.seqlo = ntohl(th->th_seq);
            s->src.seqhi = s->src.seqlo + len + 1;
            if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
                r->keep_state == PF_STATE_MODULATE) {
                  /* Generate sequence number modulator */
                  while ((s->src.seqdiff = htonl(arc4random())) == 0)
                        ;
                  pf_change_a(&th->th_seq, &th->th_sum,
                      htonl(s->src.seqlo + s->src.seqdiff), 0);
                  rewrite = 1;
            } else
                  s->src.seqdiff = 0;
            if (th->th_flags & TH_SYN) {
                  s->src.seqhi++;
                  s->src.wscale = pf_get_wscale(m, off, th->th_off, af);
            }
            s->src.max_win = MAX(ntohs(th->th_win), 1);
            if (s->src.wscale & PF_WSCALE_MASK) {
                  /* Remove scale factor from initial window */
                  int win = s->src.max_win;
                  win += 1 << (s->src.wscale & PF_WSCALE_MASK);
                  s->src.max_win = (win - 1) >>
                      (s->src.wscale & PF_WSCALE_MASK);
            }
            if (th->th_flags & TH_FIN)
                  s->src.seqhi++;
            s->dst.seqhi = 1;
            s->dst.max_win = 1;
            s->src.state = TCPS_SYN_SENT;
            s->dst.state = TCPS_CLOSED;
            s->creation = time_second;
            s->expire = time_second;
            s->timeout = PFTM_TCP_FIRST_PACKET;
            pf_set_rt_ifp(s, saddr);
            if (sn != NULL) {
                  s->src_node = sn;
                  s->src_node->states++;
            }
            if (nsn != NULL) {
                  PF_ACPY(&nsn->raddr, &pd->naddr, af);
                  s->nat_src_node = nsn;
                  s->nat_src_node->states++;
            }
            if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
                off, pd, th, &s->src, &s->dst)) {
                  REASON_SET(&reason, PFRES_MEMORY);
                  pf_src_tree_remove_state(s);
                  STATE_DEC_COUNTERS(s);
                  pool_put(&pf_state_pl, s);
                  return (PF_DROP);
            }
            if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
                pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
                &s->src, &s->dst, &rewrite)) {
                  /* This really shouldn't happen!!! */
                  DPFPRINTF(PF_DEBUG_URGENT,
                      ("pf_normalize_tcp_stateful failed on first pkt"));
                  pf_normalize_tcp_cleanup(s);
                  pf_src_tree_remove_state(s);
                  STATE_DEC_COUNTERS(s);
                  pool_put(&pf_state_pl, s);
                  return (PF_DROP);
            }
            if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
                  pf_normalize_tcp_cleanup(s);
                  REASON_SET(&reason, PFRES_STATEINS);
                  pf_src_tree_remove_state(s);
                  STATE_DEC_COUNTERS(s);
                  pool_put(&pf_state_pl, s);
                  return (PF_DROP);
            } else
                  *sm = s;
            if (tag > 0) {
                  pf_tag_ref(tag);
                  s->tag = tag;
            }
            if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
                r->keep_state == PF_STATE_SYNPROXY) {
                  s->src.state = PF_TCPS_PROXY_SRC;
                  if (nr != NULL) {
                        if (direction == PF_OUT) {
                              pf_change_ap(saddr, &th->th_sport,
                                  pd->ip_sum, &th->th_sum, &pd->baddr,
                                  bport, 0, af);
                        } else {
                              pf_change_ap(daddr, &th->th_dport,
                                  pd->ip_sum, &th->th_sum, &pd->baddr,
                                  bport, 0, af);
                        }
                  }
                  s->src.seqhi = htonl(arc4random());
                  /* Find mss option */
                  mss = pf_get_mss(m, off, th->th_off, af);
                  mss = pf_calc_mss(saddr, af, mss);
                  mss = pf_calc_mss(daddr, af, mss);
                  s->src.mss = mss;
#ifdef __FreeBSD__
                  pf_send_tcp(NULL, r, af, daddr, saddr, th->th_dport,
#else
                  pf_send_tcp(r, af, daddr, saddr, th->th_dport,
#endif
                      th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
                      TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, NULL, NULL);
                  REASON_SET(&reason, PFRES_SYNPROXY);
                  return (PF_SYNPROXY_DROP);
            }
      }

      /* copy back packet headers if we performed NAT operations */
      if (rewrite)
            m_copyback(m, off, sizeof(*th), (caddr_t)th);

      return (PF_PASS);
}

int
pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction,
    struct pfi_kif *kif, struct mbuf *m, int off, void *h,
#ifdef __FreeBSD__
    struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
    struct ifqueue *ifq, struct inpcb *inp)
#else
    struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
    struct ifqueue *ifq)
#endif
{
      struct pf_rule          *nr = NULL;
      struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
      struct udphdr           *uh = pd->hdr.udp;
      u_int16_t          bport, nport = 0;
      sa_family_t        af = pd->af;
      int                lookup = -1;
      uid_t              uid;
      gid_t              gid;
      struct pf_rule          *r, *a = NULL;
      struct pf_ruleset *ruleset = NULL;
      struct pf_src_node      *nsn = NULL;
      u_short                  reason;
      int                rewrite = 0;
      struct pf_tag           *pftag = NULL;
      int                tag = -1;
      int                asd = 0;

      if (pf_check_congestion(ifq)) {
            REASON_SET(&reason, PFRES_CONGEST);
            return (PF_DROP);
      }

      r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);

      if (direction == PF_OUT) {
            bport = nport = uh->uh_sport;
            /* check outgoing packet for BINAT/NAT */
            if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
                saddr, uh->uh_sport, daddr, uh->uh_dport,
                &pd->naddr, &nport)) != NULL) {
                  PF_ACPY(&pd->baddr, saddr, af);
                  pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
                      &uh->uh_sum, &pd->naddr, nport, 1, af);
                  rewrite++;
                  if (nr->natpass)
                        r = NULL;
                  pd->nat_rule = nr;
            }
      } else {
            bport = nport = uh->uh_dport;
            /* check incoming packet for BINAT/RDR */
            if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
                saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr,
                &nport)) != NULL) {
                  PF_ACPY(&pd->baddr, daddr, af);
                  pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
                      &uh->uh_sum, &pd->naddr, nport, 1, af);
                  rewrite++;
                  if (nr->natpass)
                        r = NULL;
                  pd->nat_rule = nr;
            }
      }

      while (r != NULL) {
            r->evaluations++;
            if (r->kif != NULL &&
                (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
                  r = r->skip[PF_SKIP_IFP].ptr;
            else if (r->direction && r->direction != direction)
                  r = r->skip[PF_SKIP_DIR].ptr;
            else if (r->af && r->af != af)
                  r = r->skip[PF_SKIP_AF].ptr;
            else if (r->proto && r->proto != IPPROTO_UDP)
                  r = r->skip[PF_SKIP_PROTO].ptr;
            else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg))
                  r = r->skip[PF_SKIP_SRC_ADDR].ptr;
            else if (r->src.port_op && !pf_match_port(r->src.port_op,
                r->src.port[0], r->src.port[1], uh->uh_sport))
                  r = r->skip[PF_SKIP_SRC_PORT].ptr;
            else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg))
                  r = r->skip[PF_SKIP_DST_ADDR].ptr;
            else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
                r->dst.port[0], r->dst.port[1], uh->uh_dport))
                  r = r->skip[PF_SKIP_DST_PORT].ptr;
            else if (r->tos && !(r->tos & pd->tos))
                  r = TAILQ_NEXT(r, entries);
            else if (r->rule_flag & PFRULE_FRAGMENT)
                  r = TAILQ_NEXT(r, entries);
            else if (r->uid.op && (lookup != -1 || (lookup =
#ifdef __FreeBSD__
                pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) &&
#else
                pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
#endif
                !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
                uid))
                  r = TAILQ_NEXT(r, entries);
            else if (r->gid.op && (lookup != -1 || (lookup =
#ifdef __FreeBSD__
                pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) &&
#else
                pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
#endif
                !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
                gid))
                  r = TAILQ_NEXT(r, entries);
            else if (r->prob && r->prob <= arc4random())
                  r = TAILQ_NEXT(r, entries);
            else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
                  r = TAILQ_NEXT(r, entries);
            else if (r->os_fingerprint != PF_OSFP_ANY)
                  r = TAILQ_NEXT(r, entries);
            else {
                  if (r->tag)
                        tag = r->tag;
                  if (r->anchor == NULL) {
                        *rm = r;
                        *am = a;
                        *rsm = ruleset;
                        if ((*rm)->quick)
                              break;
                        r = TAILQ_NEXT(r, entries);
                  } else
                        pf_step_into_anchor(&asd, &ruleset,
                            PF_RULESET_FILTER, &r, &a);
            }
            if (r == NULL)
                  pf_step_out_of_anchor(&asd, &ruleset,
                      PF_RULESET_FILTER, &r, &a);
      }
      r = *rm;
      a = *am;
      ruleset = *rsm;

      REASON_SET(&reason, PFRES_MATCH);

      if (r->log) {
            if (rewrite)
                  m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
            PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
      }

      if ((r->action == PF_DROP) &&
          ((r->rule_flag & PFRULE_RETURNICMP) ||
          (r->rule_flag & PFRULE_RETURN))) {
            /* undo NAT changes, if they have taken place */
            if (nr != NULL) {
                  if (direction == PF_OUT) {
                        pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
                            &uh->uh_sum, &pd->baddr, bport, 1, af);
                        rewrite++;
                  } else {
                        pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
                            &uh->uh_sum, &pd->baddr, bport, 1, af);
                        rewrite++;
                  }
            }
            if ((af == AF_INET) && r->return_icmp)
                  pf_send_icmp(m, r->return_icmp >> 8,
                      r->return_icmp & 255, af, r);
            else if ((af == AF_INET6) && r->return_icmp6)
                  pf_send_icmp(m, r->return_icmp6 >> 8,
                      r->return_icmp6 & 255, af, r);
      }

      if (r->action == PF_DROP)
            return (PF_DROP);

      if (pf_tag_packet(m, pftag, tag)) {
            REASON_SET(&reason, PFRES_MEMORY);
            return (PF_DROP);
      }

      if (r->keep_state || nr != NULL) {
            /* create new state */
            struct pf_state   *s = NULL;
            struct pf_src_node *sn = NULL;

            /* check maximums */
            if (r->max_states && (r->states >= r->max_states)) {
                  pf_status.lcounters[LCNT_STATES]++;
                  REASON_SET(&reason, PFRES_MAXSTATES);
                  goto cleanup;
            }
            /* src node for flter rule */
            if ((r->rule_flag & PFRULE_SRCTRACK ||
                r->rpool.opts & PF_POOL_STICKYADDR) &&
                pf_insert_src_node(&sn, r, saddr, af) != 0) {
                  REASON_SET(&reason, PFRES_SRCLIMIT);
                  goto cleanup;
            }
            /* src node for translation rule */
            if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
                ((direction == PF_OUT &&
                pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
                (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
                  REASON_SET(&reason, PFRES_SRCLIMIT);
                  goto cleanup;
            }
            s = pool_get(&pf_state_pl, PR_NOWAIT);
            if (s == NULL) {
                  REASON_SET(&reason, PFRES_MEMORY);
cleanup:
                  if (sn != NULL && sn->states == 0 && sn->expire == 0) {
                        RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
                        pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
                        pf_status.src_nodes--;
                        pool_put(&pf_src_tree_pl, sn);
                  }
                  if (nsn != sn && nsn != NULL && nsn->states == 0 &&
                      nsn->expire == 0) {
                        RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
                        pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
                        pf_status.src_nodes--;
                        pool_put(&pf_src_tree_pl, nsn);
                  }
                  return (PF_DROP);
            }
            bzero(s, sizeof(*s));
            s->rule.ptr = r;
            s->nat_rule.ptr = nr;
            s->anchor.ptr = a;
            STATE_INC_COUNTERS(s);
            s->allow_opts = r->allow_opts;
            s->log = r->log & 2;
            s->proto = IPPROTO_UDP;
            s->direction = direction;
            s->af = af;
            if (direction == PF_OUT) {
                  PF_ACPY(&s->gwy.addr, saddr, af);
                  s->gwy.port = uh->uh_sport;
                  PF_ACPY(&s->ext.addr, daddr, af);
                  s->ext.port = uh->uh_dport;
                  if (nr != NULL) {
                        PF_ACPY(&s->lan.addr, &pd->baddr, af);
                        s->lan.port = bport;
                  } else {
                        PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
                        s->lan.port = s->gwy.port;
                  }
            } else {
                  PF_ACPY(&s->lan.addr, daddr, af);
                  s->lan.port = uh->uh_dport;
                  PF_ACPY(&s->ext.addr, saddr, af);
                  s->ext.port = uh->uh_sport;
                  if (nr != NULL) {
                        PF_ACPY(&s->gwy.addr, &pd->baddr, af);
                        s->gwy.port = bport;
                  } else {
                        PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
                        s->gwy.port = s->lan.port;
                  }
            }
            s->src.state = PFUDPS_SINGLE;
            s->dst.state = PFUDPS_NO_TRAFFIC;
            s->creation = time_second;
            s->expire = time_second;
            s->timeout = PFTM_UDP_FIRST_PACKET;
            pf_set_rt_ifp(s, saddr);
            if (sn != NULL) {
                  s->src_node = sn;
                  s->src_node->states++;
            }
            if (nsn != NULL) {
                  PF_ACPY(&nsn->raddr, &pd->naddr, af);
                  s->nat_src_node = nsn;
                  s->nat_src_node->states++;
            }
            if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
                  REASON_SET(&reason, PFRES_STATEINS);
                  pf_src_tree_remove_state(s);
                  STATE_DEC_COUNTERS(s);
                  pool_put(&pf_state_pl, s);
                  return (PF_DROP);
            } else
                  *sm = s;
            if (tag > 0) {
                  pf_tag_ref(tag);
                  s->tag = tag;
            }
      }

      /* copy back packet headers if we performed NAT operations */
      if (rewrite)
            m_copyback(m, off, sizeof(*uh), (caddr_t)uh);

      return (PF_PASS);
}

int
pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction,
    struct pfi_kif *kif, struct mbuf *m, int off, void *h,
    struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
    struct ifqueue *ifq)
{
      struct pf_rule          *nr = NULL;
      struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
      struct pf_rule          *r, *a = NULL;
      struct pf_ruleset *ruleset = NULL;
      struct pf_src_node      *nsn = NULL;
      u_short                  reason;
      u_int16_t          icmpid = 0, bport, nport = 0;
      sa_family_t        af = pd->af;
      u_int8_t           icmptype = 0;    /* make the compiler happy */
      u_int8_t           icmpcode = 0;    /* make the compiler happy */
      int                state_icmp = 0;
      struct pf_tag           *pftag = NULL;
      int                tag = -1;
#ifdef INET6
      int                rewrite = 0;
#endif /* INET6 */
      int                asd = 0;

      if (pf_check_congestion(ifq)) {
            REASON_SET(&reason, PFRES_CONGEST);
            return (PF_DROP);
      }

      switch (pd->proto) {
#ifdef INET
      case IPPROTO_ICMP:
            icmptype = pd->hdr.icmp->icmp_type;
            icmpcode = pd->hdr.icmp->icmp_code;
            icmpid = pd->hdr.icmp->icmp_id;

            if (icmptype == ICMP_UNREACH ||
                icmptype == ICMP_SOURCEQUENCH ||
                icmptype == ICMP_REDIRECT ||
                icmptype == ICMP_TIMXCEED ||
                icmptype == ICMP_PARAMPROB)
                  state_icmp++;
            break;
#endif /* INET */
#ifdef INET6
      case IPPROTO_ICMPV6:
            icmptype = pd->hdr.icmp6->icmp6_type;
            icmpcode = pd->hdr.icmp6->icmp6_code;
            icmpid = pd->hdr.icmp6->icmp6_id;

            if (icmptype == ICMP6_DST_UNREACH ||
                icmptype == ICMP6_PACKET_TOO_BIG ||
                icmptype == ICMP6_TIME_EXCEEDED ||
                icmptype == ICMP6_PARAM_PROB)
                  state_icmp++;
            break;
#endif /* INET6 */
      }

      r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);

      if (direction == PF_OUT) {
            bport = nport = icmpid;
            /* check outgoing packet for BINAT/NAT */
            if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
                saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) !=
                NULL) {
                  PF_ACPY(&pd->baddr, saddr, af);
                  switch (af) {
#ifdef INET
                  case AF_INET:
                        pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
                            pd->naddr.v4.s_addr, 0);
                        pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
                            pd->hdr.icmp->icmp_cksum, icmpid, nport, 0);
                        pd->hdr.icmp->icmp_id = nport;
                        m_copyback(m, off, ICMP_MINLEN,
                            (caddr_t)pd->hdr.icmp);
                        break;
#endif /* INET */
#ifdef INET6
                  case AF_INET6:
                        pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
                            &pd->naddr, 0);
                        rewrite++;
                        break;
#endif /* INET6 */
                  }
                  if (nr->natpass)
                        r = NULL;
                  pd->nat_rule = nr;
            }
      } else {
            bport = nport = icmpid;
            /* check incoming packet for BINAT/RDR */
            if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
                saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) !=
                NULL) {
                  PF_ACPY(&pd->baddr, daddr, af);
                  switch (af) {
#ifdef INET
                  case AF_INET:
                        pf_change_a(&daddr->v4.s_addr,
                            pd->ip_sum, pd->naddr.v4.s_addr, 0);
                        break;
#endif /* INET */
#ifdef INET6
                  case AF_INET6:
                        pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
                            &pd->naddr, 0);
                        rewrite++;
                        break;
#endif /* INET6 */
                  }
                  if (nr->natpass)
                        r = NULL;
                  pd->nat_rule = nr;
            }
      }

      while (r != NULL) {
            r->evaluations++;
            if (r->kif != NULL &&
                (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
                  r = r->skip[PF_SKIP_IFP].ptr;
            else if (r->direction && r->direction != direction)
                  r = r->skip[PF_SKIP_DIR].ptr;
            else if (r->af && r->af != af)
                  r = r->skip[PF_SKIP_AF].ptr;
            else if (r->proto && r->proto != pd->proto)
                  r = r->skip[PF_SKIP_PROTO].ptr;
            else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg))
                  r = r->skip[PF_SKIP_SRC_ADDR].ptr;
            else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg))
                  r = r->skip[PF_SKIP_DST_ADDR].ptr;
            else if (r->type && r->type != icmptype + 1)
                  r = TAILQ_NEXT(r, entries);
            else if (r->code && r->code != icmpcode + 1)
                  r = TAILQ_NEXT(r, entries);
            else if (r->tos && !(r->tos & pd->tos))
                  r = TAILQ_NEXT(r, entries);
            else if (r->rule_flag & PFRULE_FRAGMENT)
                  r = TAILQ_NEXT(r, entries);
            else if (r->prob && r->prob <= arc4random())
                  r = TAILQ_NEXT(r, entries);
            else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
                  r = TAILQ_NEXT(r, entries);
            else if (r->os_fingerprint != PF_OSFP_ANY)
                  r = TAILQ_NEXT(r, entries);
            else {
                  if (r->tag)
                        tag = r->tag;
                  if (r->anchor == NULL) {
                        *rm = r;
                        *am = a;
                        *rsm = ruleset;
                        if ((*rm)->quick)
                              break;
                        r = TAILQ_NEXT(r, entries);
                  } else
                        pf_step_into_anchor(&asd, &ruleset,
                            PF_RULESET_FILTER, &r, &a);
            }
            if (r == NULL)
                  pf_step_out_of_anchor(&asd, &ruleset,
                      PF_RULESET_FILTER, &r, &a);
      }
      r = *rm;
      a = *am;
      ruleset = *rsm;

      REASON_SET(&reason, PFRES_MATCH);

      if (r->log) {
#ifdef INET6
            if (rewrite)
                  m_copyback(m, off, sizeof(struct icmp6_hdr),
                      (caddr_t)pd->hdr.icmp6);
#endif /* INET6 */
            PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
      }

      if (r->action != PF_PASS)
            return (PF_DROP);

      if (pf_tag_packet(m, pftag, tag)) {
            REASON_SET(&reason, PFRES_MEMORY);
            return (PF_DROP);
      }

      if (!state_icmp && (r->keep_state || nr != NULL)) {
            /* create new state */
            struct pf_state   *s = NULL;
            struct pf_src_node *sn = NULL;

            /* check maximums */
            if (r->max_states && (r->states >= r->max_states)) {
                  pf_status.lcounters[LCNT_STATES]++;
                  REASON_SET(&reason, PFRES_MAXSTATES);
                  goto cleanup;
            }
            /* src node for flter rule */
            if ((r->rule_flag & PFRULE_SRCTRACK ||
                r->rpool.opts & PF_POOL_STICKYADDR) &&
                pf_insert_src_node(&sn, r, saddr, af) != 0) {
                  REASON_SET(&reason, PFRES_SRCLIMIT);
                  goto cleanup;
            }
            /* src node for translation rule */
            if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
                ((direction == PF_OUT &&
                pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
                (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
                  REASON_SET(&reason, PFRES_SRCLIMIT);
                  goto cleanup;
            }
            s = pool_get(&pf_state_pl, PR_NOWAIT);
            if (s == NULL) {
                  REASON_SET(&reason, PFRES_MEMORY);
cleanup:
                  if (sn != NULL && sn->states == 0 && sn->expire == 0) {
                        RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
                        pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
                        pf_status.src_nodes--;
                        pool_put(&pf_src_tree_pl, sn);
                  }
                  if (nsn != sn && nsn != NULL && nsn->states == 0 &&
                      nsn->expire == 0) {
                        RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
                        pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
                        pf_status.src_nodes--;
                        pool_put(&pf_src_tree_pl, nsn);
                  }
                  return (PF_DROP);
            }
            bzero(s, sizeof(*s));
            s->rule.ptr = r;
            s->nat_rule.ptr = nr;
            s->anchor.ptr = a;
            STATE_INC_COUNTERS(s);
            s->allow_opts = r->allow_opts;
            s->log = r->log & 2;
            s->proto = pd->proto;
            s->direction = direction;
            s->af = af;
            if (direction == PF_OUT) {
                  PF_ACPY(&s->gwy.addr, saddr, af);
                  s->gwy.port = nport;
                  PF_ACPY(&s->ext.addr, daddr, af);
                  s->ext.port = 0;
                  if (nr != NULL) {
                        PF_ACPY(&s->lan.addr, &pd->baddr, af);
                        s->lan.port = bport;
                  } else {
                        PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
                        s->lan.port = s->gwy.port;
                  }
            } else {
                  PF_ACPY(&s->lan.addr, daddr, af);
                  s->lan.port = nport;
                  PF_ACPY(&s->ext.addr, saddr, af);
                  s->ext.port = 0; 
                  if (nr != NULL) {
                        PF_ACPY(&s->gwy.addr, &pd->baddr, af);
                        s->gwy.port = bport;
                  } else {
                        PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
                        s->gwy.port = s->lan.port;
                  }
            }
            s->creation = time_second;
            s->expire = time_second;
            s->timeout = PFTM_ICMP_FIRST_PACKET;
            pf_set_rt_ifp(s, saddr);
            if (sn != NULL) {
                  s->src_node = sn;
                  s->src_node->states++;
            }
            if (nsn != NULL) {
                  PF_ACPY(&nsn->raddr, &pd->naddr, af);
                  s->nat_src_node = nsn;
                  s->nat_src_node->states++;
            }
            if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
                  REASON_SET(&reason, PFRES_STATEINS);
                  pf_src_tree_remove_state(s);
                  STATE_DEC_COUNTERS(s);
                  pool_put(&pf_state_pl, s);
                  return (PF_DROP);
            } else
                  *sm = s;
            if (tag > 0) {
                  pf_tag_ref(tag);
                  s->tag = tag;
            }
      }

#ifdef INET6
      /* copy back packet headers if we performed IPv6 NAT operations */
      if (rewrite)
            m_copyback(m, off, sizeof(struct icmp6_hdr),
                (caddr_t)pd->hdr.icmp6);
#endif /* INET6 */

      return (PF_PASS);
}

int
pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction,
    struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
    struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq)
{
      struct pf_rule          *nr = NULL;
      struct pf_rule          *r, *a = NULL;
      struct pf_ruleset *ruleset = NULL;
      struct pf_src_node      *nsn = NULL;
      struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
      sa_family_t        af = pd->af;
      u_short                  reason;
      struct pf_tag           *pftag = NULL;
      int                tag = -1;
      int                asd = 0;

      if (pf_check_congestion(ifq)) {
            REASON_SET(&reason, PFRES_CONGEST);
            return (PF_DROP);
      }

      r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);

      if (direction == PF_OUT) {
            /* check outgoing packet for BINAT/NAT */
            if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
                saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
                  PF_ACPY(&pd->baddr, saddr, af);
                  switch (af) {
#ifdef INET
                  case AF_INET:
                        pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
                            pd->naddr.v4.s_addr, 0);
                        break;
#endif /* INET */
#ifdef INET6
                  case AF_INET6:
                        PF_ACPY(saddr, &pd->naddr, af);
                        break;
#endif /* INET6 */
                  }
                  if (nr->natpass)
                        r = NULL;
                  pd->nat_rule = nr;
            }
      } else {
            /* check incoming packet for BINAT/RDR */
            if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
                saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
                  PF_ACPY(&pd->baddr, daddr, af);
                  switch (af) {
#ifdef INET
                  case AF_INET:
                        pf_change_a(&daddr->v4.s_addr,
                            pd->ip_sum, pd->naddr.v4.s_addr, 0);
                        break;
#endif /* INET */
#ifdef INET6
                  case AF_INET6:
                        PF_ACPY(daddr, &pd->naddr, af);
                        break;
#endif /* INET6 */
                  }
                  if (nr->natpass)
                        r = NULL;
                  pd->nat_rule = nr;
            }
      }

      while (r != NULL) {
            r->evaluations++;
            if (r->kif != NULL &&
                (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
                  r = r->skip[PF_SKIP_IFP].ptr;
            else if (r->direction && r->direction != direction)
                  r = r->skip[PF_SKIP_DIR].ptr;
            else if (r->af && r->af != af)
                  r = r->skip[PF_SKIP_AF].ptr;
            else if (r->proto && r->proto != pd->proto)
                  r = r->skip[PF_SKIP_PROTO].ptr;
            else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg))
                  r = r->skip[PF_SKIP_SRC_ADDR].ptr;
            else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg))
                  r = r->skip[PF_SKIP_DST_ADDR].ptr;
            else if (r->tos && !(r->tos & pd->tos))
                  r = TAILQ_NEXT(r, entries);
            else if (r->rule_flag & PFRULE_FRAGMENT)
                  r = TAILQ_NEXT(r, entries);
            else if (r->prob && r->prob <= arc4random())
                  r = TAILQ_NEXT(r, entries);
            else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
                  r = TAILQ_NEXT(r, entries);
            else if (r->os_fingerprint != PF_OSFP_ANY)
                  r = TAILQ_NEXT(r, entries);
            else {
                  if (r->tag)
                        tag = r->tag;
                  if (r->anchor == NULL) {
                        *rm = r;
                        *am = a;
                        *rsm = ruleset;
                        if ((*rm)->quick)
                              break;
                        r = TAILQ_NEXT(r, entries);
                  } else
                        pf_step_into_anchor(&asd, &ruleset,
                            PF_RULESET_FILTER, &r, &a);
            }
            if (r == NULL)
                  pf_step_out_of_anchor(&asd, &ruleset,
                      PF_RULESET_FILTER, &r, &a);
      }
      r = *rm;
      a = *am;
      ruleset = *rsm;

      REASON_SET(&reason, PFRES_MATCH);

      if (r->log)
            PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);

      if ((r->action == PF_DROP) &&
          ((r->rule_flag & PFRULE_RETURNICMP) ||
          (r->rule_flag & PFRULE_RETURN))) {
            struct pf_addr *a = NULL;

            if (nr != NULL) {
                  if (direction == PF_OUT)
                        a = saddr;
                  else
                        a = daddr;
            }
            if (a != NULL) {
                  switch (af) {
#ifdef INET
                  case AF_INET:
                        pf_change_a(&a->v4.s_addr, pd->ip_sum,
                            pd->baddr.v4.s_addr, 0);
                        break;
#endif /* INET */
#ifdef INET6
                  case AF_INET6:
                        PF_ACPY(a, &pd->baddr, af);
                        break;
#endif /* INET6 */
                  }
            }
            if ((af == AF_INET) && r->return_icmp)
                  pf_send_icmp(m, r->return_icmp >> 8,
                      r->return_icmp & 255, af, r);
            else if ((af == AF_INET6) && r->return_icmp6)
                  pf_send_icmp(m, r->return_icmp6 >> 8,
                      r->return_icmp6 & 255, af, r);
      }

      if (r->action != PF_PASS)
            return (PF_DROP);

      if (pf_tag_packet(m, pftag, tag)) {
            REASON_SET(&reason, PFRES_MEMORY);
            return (PF_DROP);
      }

      if (r->keep_state || nr != NULL) {
            /* create new state */
            struct pf_state   *s = NULL;
            struct pf_src_node *sn = NULL;

            /* check maximums */
            if (r->max_states && (r->states >= r->max_states)) {
                  pf_status.lcounters[LCNT_STATES]++;
                  REASON_SET(&reason, PFRES_MAXSTATES);
                  goto cleanup;
            }
            /* src node for flter rule */
            if ((r->rule_flag & PFRULE_SRCTRACK ||
                r->rpool.opts & PF_POOL_STICKYADDR) &&
                pf_insert_src_node(&sn, r, saddr, af) != 0) {
                  REASON_SET(&reason, PFRES_SRCLIMIT);
                  goto cleanup;
            }
            /* src node for translation rule */
            if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
                ((direction == PF_OUT &&
                pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
                (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
                  REASON_SET(&reason, PFRES_SRCLIMIT);
                  goto cleanup;
            }
            s = pool_get(&pf_state_pl, PR_NOWAIT);
            if (s == NULL) {
                  REASON_SET(&reason, PFRES_MEMORY);
cleanup:
                  if (sn != NULL && sn->states == 0 && sn->expire == 0) {
                        RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
                        pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
                        pf_status.src_nodes--;
                        pool_put(&pf_src_tree_pl, sn);
                  }
                  if (nsn != sn && nsn != NULL && nsn->states == 0 &&
                      nsn->expire == 0) {
                        RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
                        pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
                        pf_status.src_nodes--;
                        pool_put(&pf_src_tree_pl, nsn);
                  }
                  return (PF_DROP);
            }
            bzero(s, sizeof(*s));
            s->rule.ptr = r;
            s->nat_rule.ptr = nr;
            s->anchor.ptr = a;
            STATE_INC_COUNTERS(s);
            s->allow_opts = r->allow_opts;
            s->log = r->log & 2;
            s->proto = pd->proto;
            s->direction = direction;
            s->af = af;
            if (direction == PF_OUT) {
                  PF_ACPY(&s->gwy.addr, saddr, af);
                  PF_ACPY(&s->ext.addr, daddr, af);
                  if (nr != NULL)
                        PF_ACPY(&s->lan.addr, &pd->baddr, af);
                  else
                        PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
            } else {
                  PF_ACPY(&s->lan.addr, daddr, af);
                  PF_ACPY(&s->ext.addr, saddr, af);
                  if (nr != NULL)
                        PF_ACPY(&s->gwy.addr, &pd->baddr, af);
                  else
                        PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
            }
            s->src.state = PFOTHERS_SINGLE;
            s->dst.state = PFOTHERS_NO_TRAFFIC;
            s->creation = time_second;
            s->expire = time_second;
            s->timeout = PFTM_OTHER_FIRST_PACKET;
            pf_set_rt_ifp(s, saddr);
            if (sn != NULL) {
                  s->src_node = sn;
                  s->src_node->states++;
            }
            if (nsn != NULL) {
                  PF_ACPY(&nsn->raddr, &pd->naddr, af);
                  s->nat_src_node = nsn;
                  s->nat_src_node->states++;
            }
            if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
                  REASON_SET(&reason, PFRES_STATEINS);
                  pf_src_tree_remove_state(s);
                  STATE_DEC_COUNTERS(s);
                  pool_put(&pf_state_pl, s);
                  return (PF_DROP);
            } else
                  *sm = s;
            if (tag > 0) {
                  pf_tag_ref(tag);
                  s->tag = tag;
            }
      }

      return (PF_PASS);
}

int
pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
    struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
    struct pf_ruleset **rsm)
{
      struct pf_rule          *r, *a = NULL;
      struct pf_ruleset *ruleset = NULL;
      sa_family_t        af = pd->af;
      u_short                  reason;
      struct pf_tag           *pftag = NULL;
      int                tag = -1;
      int                asd = 0;

      r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
      while (r != NULL) {
            r->evaluations++;
            if (r->kif != NULL &&
                (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
                  r = r->skip[PF_SKIP_IFP].ptr;
            else if (r->direction && r->direction != direction)
                  r = r->skip[PF_SKIP_DIR].ptr;
            else if (r->af && r->af != af)
                  r = r->skip[PF_SKIP_AF].ptr;
            else if (r->proto && r->proto != pd->proto)
                  r = r->skip[PF_SKIP_PROTO].ptr;
            else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg))
                  r = r->skip[PF_SKIP_SRC_ADDR].ptr;
            else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg))
                  r = r->skip[PF_SKIP_DST_ADDR].ptr;
            else if (r->tos && !(r->tos & pd->tos))
                  r = TAILQ_NEXT(r, entries);
            else if (r->src.port_op || r->dst.port_op ||
                r->flagset || r->type || r->code ||
                r->os_fingerprint != PF_OSFP_ANY)
                  r = TAILQ_NEXT(r, entries);
            else if (r->prob && r->prob <= arc4random())
                  r = TAILQ_NEXT(r, entries);
            else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
                  r = TAILQ_NEXT(r, entries);
            else {
                  if (r->anchor == NULL) {
                        *rm = r;
                        *am = a;
                        *rsm = ruleset;
                        if ((*rm)->quick)
                              break;
                        r = TAILQ_NEXT(r, entries);
                  } else
                        pf_step_into_anchor(&asd, &ruleset,
                            PF_RULESET_FILTER, &r, &a);
            }
            if (r == NULL)
                  pf_step_out_of_anchor(&asd, &ruleset,
                      PF_RULESET_FILTER, &r, &a);
      }
      r = *rm;
      a = *am;
      ruleset = *rsm;

      REASON_SET(&reason, PFRES_MATCH);

      if (r->log)
            PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);

      if (r->action != PF_PASS)
            return (PF_DROP);

      if (pf_tag_packet(m, pftag, tag)) {
            REASON_SET(&reason, PFRES_MEMORY);
            return (PF_DROP);
      }

      return (PF_PASS);
}

int
pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
    struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
    u_short *reason)
{
      struct pf_state          key;
      struct tcphdr           *th = pd->hdr.tcp;
      u_int16_t          win = ntohs(th->th_win);
      u_int32_t          ack, end, seq, orig_seq;
      u_int8_t           sws, dws;
      int                ackskew;
      int                copyback = 0;
      struct pf_state_peer    *src, *dst;

      key.af = pd->af;
      key.proto = IPPROTO_TCP;
      if (direction == PF_IN) {
            PF_ACPY(&key.ext.addr, pd->src, key.af);
            PF_ACPY(&key.gwy.addr, pd->dst, key.af);
            key.ext.port = th->th_sport;
            key.gwy.port = th->th_dport;
      } else {
            PF_ACPY(&key.lan.addr, pd->src, key.af);
            PF_ACPY(&key.ext.addr, pd->dst, key.af);
            key.lan.port = th->th_sport;
            key.ext.port = th->th_dport;
      }

      STATE_LOOKUP();

      if (direction == (*state)->direction) {
            src = &(*state)->src;
            dst = &(*state)->dst;
      } else {
            src = &(*state)->dst;
            dst = &(*state)->src;
      }

      if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
            if (direction != (*state)->direction) {
                  REASON_SET(reason, PFRES_SYNPROXY);
                  return (PF_SYNPROXY_DROP);
            }
            if (th->th_flags & TH_SYN) {
                  if (ntohl(th->th_seq) != (*state)->src.seqlo) {
                        REASON_SET(reason, PFRES_SYNPROXY);
                        return (PF_DROP);
                  }
#ifdef __FreeBSD__
                  pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
#else
                  pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
#endif
                      pd->src, th->th_dport, th->th_sport,
                      (*state)->src.seqhi, ntohl(th->th_seq) + 1,
                      TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
                      NULL, NULL);
                  REASON_SET(reason, PFRES_SYNPROXY);
                  return (PF_SYNPROXY_DROP);
            } else if (!(th->th_flags & TH_ACK) ||
                (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
                (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
                  REASON_SET(reason, PFRES_SYNPROXY);
                  return (PF_DROP);
            } else if ((*state)->src_node != NULL &&
                pf_src_connlimit(state)) {
                  REASON_SET(reason, PFRES_SRCLIMIT);
                  return (PF_DROP);
            } else
                  (*state)->src.state = PF_TCPS_PROXY_DST;
      }
      if ((*state)->src.state == PF_TCPS_PROXY_DST) {
            struct pf_state_host *src, *dst;

            if (direction == PF_OUT) {
                  src = &(*state)->gwy;
                  dst = &(*state)->ext;
            } else {
                  src = &(*state)->ext;
                  dst = &(*state)->lan;
            }
            if (direction == (*state)->direction) {
                  if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
                      (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
                      (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
                        REASON_SET(reason, PFRES_SYNPROXY);
                        return (PF_DROP);
                  }
                  (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
                  if ((*state)->dst.seqhi == 1)
                        (*state)->dst.seqhi = htonl(arc4random());
#ifdef __FreeBSD__
                  pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
                      &src->addr,
#else
                  pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
#endif
                      &dst->addr, src->port, dst->port,
                      (*state)->dst.seqhi, 0, TH_SYN, 0,
                      (*state)->src.mss, 0, 0, NULL, NULL);
                  REASON_SET(reason, PFRES_SYNPROXY);
                  return (PF_SYNPROXY_DROP);
            } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
                (TH_SYN|TH_ACK)) ||
                (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
                  REASON_SET(reason, PFRES_SYNPROXY);
                  return (PF_DROP);
            } else {
                  (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
                  (*state)->dst.seqlo = ntohl(th->th_seq);
#ifdef __FreeBSD__
                  pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
#else
                  pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
#endif
                      pd->src, th->th_dport, th->th_sport,
                      ntohl(th->th_ack), ntohl(th->th_seq) + 1,
                      TH_ACK, (*state)->src.max_win, 0, 0, 0,
                      NULL, NULL);
#ifdef __FreeBSD__
                  pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
                      &src->addr,
#else
                  pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
#endif
                      &dst->addr, src->port, dst->port,
                      (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
                      TH_ACK, (*state)->dst.max_win, 0, 0, 1,
                      NULL, NULL);
                  (*state)->src.seqdiff = (*state)->dst.seqhi -
                      (*state)->src.seqlo;
                  (*state)->dst.seqdiff = (*state)->src.seqhi -
                      (*state)->dst.seqlo;
                  (*state)->src.seqhi = (*state)->src.seqlo +
                      (*state)->dst.max_win;
                  (*state)->dst.seqhi = (*state)->dst.seqlo +
                      (*state)->src.max_win;
                  (*state)->src.wscale = (*state)->dst.wscale = 0;
                  (*state)->src.state = (*state)->dst.state =
                      TCPS_ESTABLISHED;
                  REASON_SET(reason, PFRES_SYNPROXY);
                  return (PF_SYNPROXY_DROP);
            }
      }

      if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
            sws = src->wscale & PF_WSCALE_MASK;
            dws = dst->wscale & PF_WSCALE_MASK;
      } else
            sws = dws = 0;

      /*
       * Sequence tracking algorithm from Guido van Rooij's paper:
       *   http://www.madison-gurkha.com/publications/tcp_filtering/
       *    tcp_filtering.ps
       */

      orig_seq = seq = ntohl(th->th_seq);
      if (src->seqlo == 0) {
            /* First packet from this end. Set its state */

            if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
                src->scrub == NULL) {
                  if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
                        REASON_SET(reason, PFRES_MEMORY);
                        return (PF_DROP);
                  }
            }

            /* Deferred generation of sequence number modulator */
            if (dst->seqdiff && !src->seqdiff) {
                  while ((src->seqdiff = htonl(arc4random())) == 0)
                        ;
                  ack = ntohl(th->th_ack) - dst->seqdiff;
                  pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
                      src->seqdiff), 0);
                  pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
                  copyback = 1;
            } else {
                  ack = ntohl(th->th_ack);
            }

            end = seq + pd->p_len;
            if (th->th_flags & TH_SYN) {
                  end++;
                  if (dst->wscale & PF_WSCALE_FLAG) {
                        src->wscale = pf_get_wscale(m, off, th->th_off,
                            pd->af);
                        if (src->wscale & PF_WSCALE_FLAG) {
                              /* Remove scale factor from initial
                               * window */
                              sws = src->wscale & PF_WSCALE_MASK;
                              win = ((u_int32_t)win + (1 << sws) - 1)
                                  >> sws;
                              dws = dst->wscale & PF_WSCALE_MASK;
                        } else {
                              /* fixup other window */
                              dst->max_win <<= dst->wscale &
                                  PF_WSCALE_MASK;
                              /* in case of a retrans SYN|ACK */
                              dst->wscale = 0;
                        }
                  }
            }
            if (th->th_flags & TH_FIN)
                  end++;

            src->seqlo = seq;
            if (src->state < TCPS_SYN_SENT)
                  src->state = TCPS_SYN_SENT;

            /*
             * May need to slide the window (seqhi may have been set by
             * the crappy stack check or if we picked up the connection
             * after establishment)
             */
            if (src->seqhi == 1 ||
                SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
                  src->seqhi = end + MAX(1, dst->max_win << dws);
            if (win > src->max_win)
                  src->max_win = win;

      } else {
            ack = ntohl(th->th_ack) - dst->seqdiff;
            if (src->seqdiff) {
                  /* Modulate sequence numbers */
                  pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
                      src->seqdiff), 0);
                  pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
                  copyback = 1;
            }
            end = seq + pd->p_len;
            if (th->th_flags & TH_SYN)
                  end++;
            if (th->th_flags & TH_FIN)
                  end++;
      }

      if ((th->th_flags & TH_ACK) == 0) {
            /* Let it pass through the ack skew check */
            ack = dst->seqlo;
      } else if ((ack == 0 &&
          (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
          /* broken tcp stacks do not set ack */
          (dst->state < TCPS_SYN_SENT)) {
            /*
             * Many stacks (ours included) will set the ACK number in an
             * FIN|ACK if the SYN times out -- no sequence to ACK.
             */
            ack = dst->seqlo;
      }

      if (seq == end) {
            /* Ease sequencing restrictions on no data packets */
            seq = src->seqlo;
            end = seq;
      }

      ackskew = dst->seqlo - ack;


      /*
       * Need to demodulate the sequence numbers in any TCP SACK options
       * (Selective ACK). We could optionally validate the SACK values
       * against the current ACK window, either forwards or backwards, but
       * I'm not confident that SACK has been implemented properly
       * everywhere. It wouldn't surprise me if several stacks accidently
       * SACK too far backwards of previously ACKed data. There really aren't
       * any security implications of bad SACKing unless the target stack
       * doesn't validate the option length correctly. Someone trying to
       * spoof into a TCP connection won't bother blindly sending SACK
       * options anyway.
       */
      if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
            if (pf_modulate_sack(m, off, pd, th, dst))
                  copyback = 1;
      }


#define MAXACKWINDOW (0xffff + 1500)      /* 1500 is an arbitrary fudge factor */
      if (SEQ_GEQ(src->seqhi, end) &&
          /* Last octet inside other's window space */
          SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
          /* Retrans: not more than one window back */
          (ackskew >= -MAXACKWINDOW) &&
          /* Acking not more than one reassembled fragment backwards */
          (ackskew <= (MAXACKWINDOW << sws)) &&
          /* Acking not more than one window forward */
          ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
          (pd->flags & PFDESC_IP_REAS) == 0)) {
          /* Require an exact sequence match on resets when possible */

            if (dst->scrub || src->scrub) {
                  if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
                      *state, src, dst, &copyback))
                        return (PF_DROP);
            }

            /* update max window */
            if (src->max_win < win)
                  src->max_win = win;
            /* synchronize sequencing */
            if (SEQ_GT(end, src->seqlo))
                  src->seqlo = end;
            /* slide the window of what the other end can send */
            if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
                  dst->seqhi = ack + MAX((win << sws), 1);


            /* update states */
            if (th->th_flags & TH_SYN)
                  if (src->state < TCPS_SYN_SENT)
                        src->state = TCPS_SYN_SENT;
            if (th->th_flags & TH_FIN)
                  if (src->state < TCPS_CLOSING)
                        src->state = TCPS_CLOSING;
            if (th->th_flags & TH_ACK) {
                  if (dst->state == TCPS_SYN_SENT) {
                        dst->state = TCPS_ESTABLISHED;
                        if (src->state == TCPS_ESTABLISHED &&
                            (*state)->src_node != NULL &&
                            pf_src_connlimit(state)) {
                              REASON_SET(reason, PFRES_SRCLIMIT);
                              return (PF_DROP);
                        }
                  } else if (dst->state == TCPS_CLOSING)
                        dst->state = TCPS_FIN_WAIT_2;
            }
            if (th->th_flags & TH_RST)
                  src->state = dst->state = TCPS_TIME_WAIT;

            /* update expire time */
            (*state)->expire = time_second;
            if (src->state >= TCPS_FIN_WAIT_2 &&
                dst->state >= TCPS_FIN_WAIT_2)
                  (*state)->timeout = PFTM_TCP_CLOSED;
            else if (src->state >= TCPS_CLOSING &&
                dst->state >= TCPS_CLOSING)
                  (*state)->timeout = PFTM_TCP_FIN_WAIT;
            else if (src->state < TCPS_ESTABLISHED ||
                dst->state < TCPS_ESTABLISHED)
                  (*state)->timeout = PFTM_TCP_OPENING;
            else if (src->state >= TCPS_CLOSING ||
                dst->state >= TCPS_CLOSING)
                  (*state)->timeout = PFTM_TCP_CLOSING;
            else
                  (*state)->timeout = PFTM_TCP_ESTABLISHED;

            /* Fall through to PASS packet */

      } else if ((dst->state < TCPS_SYN_SENT ||
            dst->state >= TCPS_FIN_WAIT_2 ||
            src->state >= TCPS_FIN_WAIT_2) &&
          SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
          /* Within a window forward of the originating packet */
          SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
          /* Within a window backward of the originating packet */

            /*
             * This currently handles three situations:
             *  1) Stupid stacks will shotgun SYNs before their peer
             *     replies.
             *  2) When PF catches an already established stream (the
             *     firewall rebooted, the state table was flushed, routes
             *     changed...)
             *  3) Packets get funky immediately after the connection
             *     closes (this should catch Solaris spurious ACK|FINs
             *     that web servers like to spew after a close)
             *
             * This must be a little more careful than the above code
             * since packet floods will also be caught here. We don't
             * update the TTL here to mitigate the damage of a packet
             * flood and so the same code can handle awkward establishment
             * and a loosened connection close.
             * In the establishment case, a correct peer response will
             * validate the connection, go through the normal state code
             * and keep updating the state TTL.
             */

            if (pf_status.debug >= PF_DEBUG_MISC) {
                  printf("pf: loose state match: ");
                  pf_print_state(*state);
                  pf_print_flags(th->th_flags);
                  printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n",
                      seq, ack, pd->p_len, ackskew,
                      (*state)->packets[0], (*state)->packets[1]);
            }

            if (dst->scrub || src->scrub) {
                  if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
                      *state, src, dst, &copyback))
                        return (PF_DROP);
            }

            /* update max window */
            if (src->max_win < win)
                  src->max_win = win;
            /* synchronize sequencing */
            if (SEQ_GT(end, src->seqlo))
                  src->seqlo = end;
            /* slide the window of what the other end can send */
            if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
                  dst->seqhi = ack + MAX((win << sws), 1);

            /*
             * Cannot set dst->seqhi here since this could be a shotgunned
             * SYN and not an already established connection.
             */

            if (th->th_flags & TH_FIN)
                  if (src->state < TCPS_CLOSING)
                        src->state = TCPS_CLOSING;
            if (th->th_flags & TH_RST)
                  src->state = dst->state = TCPS_TIME_WAIT;

            /* Fall through to PASS packet */

      } else {
            if ((*state)->dst.state == TCPS_SYN_SENT &&
                (*state)->src.state == TCPS_SYN_SENT) {
                  /* Send RST for state mismatches during handshake */
                  if (!(th->th_flags & TH_RST))
#ifdef __FreeBSD__
                        pf_send_tcp(m, (*state)->rule.ptr, pd->af,
#else
                        pf_send_tcp((*state)->rule.ptr, pd->af,
#endif
                            pd->dst, pd->src, th->th_dport,
                            th->th_sport, ntohl(th->th_ack), 0,
                            TH_RST, 0, 0,
                            (*state)->rule.ptr->return_ttl, 1,
                            pd->eh, kif->pfik_ifp);
                  src->seqlo = 0;
                  src->seqhi = 1;
                  src->max_win = 1;
            } else if (pf_status.debug >= PF_DEBUG_MISC) {
                  printf("pf: BAD state: ");
                  pf_print_state(*state);
                  pf_print_flags(th->th_flags);
                  printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d "
                      "dir=%s,%s\n", seq, ack, pd->p_len, ackskew,
                      (*state)->packets[0], (*state)->packets[1],
                      direction == PF_IN ? "in" : "out",
                      direction == (*state)->direction ? "fwd" : "rev");
                  printf("pf: State failure on: %c %c %c %c | %c %c\n",
                      SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
                      SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
                      ' ': '2',
                      (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
                      (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
                      SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
                      SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
            }
            REASON_SET(reason, PFRES_BADSTATE);
            return (PF_DROP);
      }

      /* Any packets which have gotten here are to be passed */

      /* translate source/destination address, if necessary */
      if (STATE_TRANSLATE(*state)) {
            if (direction == PF_OUT)
                  pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
                      &th->th_sum, &(*state)->gwy.addr,
                      (*state)->gwy.port, 0, pd->af);
            else
                  pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
                      &th->th_sum, &(*state)->lan.addr,
                      (*state)->lan.port, 0, pd->af);
            m_copyback(m, off, sizeof(*th), (caddr_t)th);
      } else if (copyback) {
            /* Copyback sequence modulation or stateful scrub changes */
            m_copyback(m, off, sizeof(*th), (caddr_t)th);
      }

      return (PF_PASS);
}

int
pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
    struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
{
      struct pf_state_peer    *src, *dst;
      struct pf_state          key;
      struct udphdr           *uh = pd->hdr.udp;

      key.af = pd->af;
      key.proto = IPPROTO_UDP;
      if (direction == PF_IN) {
            PF_ACPY(&key.ext.addr, pd->src, key.af);
            PF_ACPY(&key.gwy.addr, pd->dst, key.af);
            key.ext.port = uh->uh_sport;
            key.gwy.port = uh->uh_dport;
      } else {
            PF_ACPY(&key.lan.addr, pd->src, key.af);
            PF_ACPY(&key.ext.addr, pd->dst, key.af);
            key.lan.port = uh->uh_sport;
            key.ext.port = uh->uh_dport;
      }

      STATE_LOOKUP();

      if (direction == (*state)->direction) {
            src = &(*state)->src;
            dst = &(*state)->dst;
      } else {
            src = &(*state)->dst;
            dst = &(*state)->src;
      }

      /* update states */
      if (src->state < PFUDPS_SINGLE)
            src->state = PFUDPS_SINGLE;
      if (dst->state == PFUDPS_SINGLE)
            dst->state = PFUDPS_MULTIPLE;

      /* update expire time */
      (*state)->expire = time_second;
      if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
            (*state)->timeout = PFTM_UDP_MULTIPLE;
      else
            (*state)->timeout = PFTM_UDP_SINGLE;

      /* translate source/destination address, if necessary */
      if (STATE_TRANSLATE(*state)) {
            if (direction == PF_OUT)
                  pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
                      &uh->uh_sum, &(*state)->gwy.addr,
                      (*state)->gwy.port, 1, pd->af);
            else
                  pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
                      &uh->uh_sum, &(*state)->lan.addr,
                      (*state)->lan.port, 1, pd->af);
            m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
      }

      return (PF_PASS);
}

int
pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
    struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
{
      struct pf_addr    *saddr = pd->src, *daddr = pd->dst;
      u_int16_t    icmpid = 0;            /* make the compiler happy */
      u_int16_t   *icmpsum = NULL;  /* make the compiler happy */
      u_int8_t     icmptype = 0;          /* make the compiler happy */
      int          state_icmp = 0;

      switch (pd->proto) {
#ifdef INET
      case IPPROTO_ICMP:
            icmptype = pd->hdr.icmp->icmp_type;
            icmpid = pd->hdr.icmp->icmp_id;
            icmpsum = &pd->hdr.icmp->icmp_cksum;

            if (icmptype == ICMP_UNREACH ||
                icmptype == ICMP_SOURCEQUENCH ||
                icmptype == ICMP_REDIRECT ||
                icmptype == ICMP_TIMXCEED ||
                icmptype == ICMP_PARAMPROB)
                  state_icmp++;
            break;
#endif /* INET */
#ifdef INET6
      case IPPROTO_ICMPV6:
            icmptype = pd->hdr.icmp6->icmp6_type;
            icmpid = pd->hdr.icmp6->icmp6_id;
            icmpsum = &pd->hdr.icmp6->icmp6_cksum;

            if (icmptype == ICMP6_DST_UNREACH ||
                icmptype == ICMP6_PACKET_TOO_BIG ||
                icmptype == ICMP6_TIME_EXCEEDED ||
                icmptype == ICMP6_PARAM_PROB)
                  state_icmp++;
            break;
#endif /* INET6 */
      }

      if (!state_icmp) {

            /*
             * ICMP query/reply message not related to a TCP/UDP packet.
             * Search for an ICMP state.
             */
            struct pf_state         key;

            key.af = pd->af;
            key.proto = pd->proto;
            if (direction == PF_IN) {
                  PF_ACPY(&key.ext.addr, pd->src, key.af);
                  PF_ACPY(&key.gwy.addr, pd->dst, key.af);
                  key.ext.port = 0;
                  key.gwy.port = icmpid;
            } else {
                  PF_ACPY(&key.lan.addr, pd->src, key.af);
                  PF_ACPY(&key.ext.addr, pd->dst, key.af);
                  key.lan.port = icmpid;
                  key.ext.port = 0;
            }

            STATE_LOOKUP();

            (*state)->expire = time_second;
            (*state)->timeout = PFTM_ICMP_ERROR_REPLY;

            /* translate source/destination address, if necessary */
            if (STATE_TRANSLATE(*state)) {
                  if (direction == PF_OUT) {
                        switch (pd->af) {
#ifdef INET
                        case AF_INET:
                              pf_change_a(&saddr->v4.s_addr,
                                  pd->ip_sum,
                                  (*state)->gwy.addr.v4.s_addr, 0);
                              pd->hdr.icmp->icmp_cksum =
                                  pf_cksum_fixup(
                                  pd->hdr.icmp->icmp_cksum, icmpid,
                                  (*state)->gwy.port, 0);
                              pd->hdr.icmp->icmp_id =
                                  (*state)->gwy.port;
                              m_copyback(m, off, ICMP_MINLEN,
                                  (caddr_t)pd->hdr.icmp);
                              break;
#endif /* INET */
#ifdef INET6
                        case AF_INET6:
                              pf_change_a6(saddr,
                                  &pd->hdr.icmp6->icmp6_cksum,
                                  &(*state)->gwy.addr, 0);
                              m_copyback(m, off,
                                  sizeof(struct icmp6_hdr),
                                  (caddr_t)pd->hdr.icmp6);
                              break;
#endif /* INET6 */
                        }
                  } else {
                        switch (pd->af) {
#ifdef INET
                        case AF_INET:
                              pf_change_a(&daddr->v4.s_addr,
                                  pd->ip_sum,
                                  (*state)->lan.addr.v4.s_addr, 0);
                              pd->hdr.icmp->icmp_cksum =
                                  pf_cksum_fixup(
                                  pd->hdr.icmp->icmp_cksum, icmpid,
                                  (*state)->lan.port, 0);
                              pd->hdr.icmp->icmp_id =
                                  (*state)->lan.port;
                              m_copyback(m, off, ICMP_MINLEN,
                                  (caddr_t)pd->hdr.icmp);
                              break;
#endif /* INET */
#ifdef INET6
                        case AF_INET6:
                              pf_change_a6(daddr,
                                  &pd->hdr.icmp6->icmp6_cksum,
                                  &(*state)->lan.addr, 0);
                              m_copyback(m, off,
                                  sizeof(struct icmp6_hdr),
                                  (caddr_t)pd->hdr.icmp6);
                              break;
#endif /* INET6 */
                        }
                  }
            }

            return (PF_PASS);

      } else {
            /*
             * ICMP error message in response to a TCP/UDP packet.
             * Extract the inner TCP/UDP header and search for that state.
             */

            struct pf_pdesc   pd2;
#ifdef INET
            struct ip   h2;
#endif /* INET */
#ifdef INET6
            struct ip6_hdr    h2_6;
            int         terminal = 0;
#endif /* INET6 */
            int         ipoff2 = 0; /* make the compiler happy */
            int         off2 = 0;   /* make the compiler happy */

            pd2.af = pd->af;
            switch (pd->af) {
#ifdef INET
            case AF_INET:
                  /* offset of h2 in mbuf chain */
                  ipoff2 = off + ICMP_MINLEN;

                  if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
                      NULL, reason, pd2.af)) {
                        DPFPRINTF(PF_DEBUG_MISC,
                            ("pf: ICMP error message too short "
                            "(ip)\n"));
                        return (PF_DROP);
                  }
                  /*
                   * ICMP error messages don't refer to non-first
                   * fragments
                   */
                  if (h2.ip_off & htons(IP_OFFMASK)) {
                        REASON_SET(reason, PFRES_FRAG);
                        return (PF_DROP);
                  }

                  /* offset of protocol header that follows h2 */
                  off2 = ipoff2 + (h2.ip_hl << 2);

                  pd2.proto = h2.ip_p;
                  pd2.src = (struct pf_addr *)&h2.ip_src;
                  pd2.dst = (struct pf_addr *)&h2.ip_dst;
                  pd2.ip_sum = &h2.ip_sum;
                  break;
#endif /* INET */
#ifdef INET6
            case AF_INET6:
                  ipoff2 = off + sizeof(struct icmp6_hdr);

                  if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
                      NULL, reason, pd2.af)) {
                        DPFPRINTF(PF_DEBUG_MISC,
                            ("pf: ICMP error message too short "
                            "(ip6)\n"));
                        return (PF_DROP);
                  }
                  pd2.proto = h2_6.ip6_nxt;
                  pd2.src = (struct pf_addr *)&h2_6.ip6_src;
                  pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
                  pd2.ip_sum = NULL;
                  off2 = ipoff2 + sizeof(h2_6);
                  do {
                        switch (pd2.proto) {
                        case IPPROTO_FRAGMENT:
                              /*
                               * ICMPv6 error messages for
                               * non-first fragments
                               */
                              REASON_SET(reason, PFRES_FRAG);
                              return (PF_DROP);
                        case IPPROTO_AH:
                        case IPPROTO_HOPOPTS:
                        case IPPROTO_ROUTING:
                        case IPPROTO_DSTOPTS: {
                              /* get next header and header length */
                              struct ip6_ext opt6;

                              if (!pf_pull_hdr(m, off2, &opt6,
                                  sizeof(opt6), NULL, reason,
                                  pd2.af)) {
                                    DPFPRINTF(PF_DEBUG_MISC,
                                        ("pf: ICMPv6 short opt\n"));
                                    return (PF_DROP);
                              }
                              if (pd2.proto == IPPROTO_AH)
                                    off2 += (opt6.ip6e_len + 2) * 4;
                              else
                                    off2 += (opt6.ip6e_len + 1) * 8;
                              pd2.proto = opt6.ip6e_nxt;
                              /* goto the next header */
                              break;
                        }
                        default:
                              terminal++;
                              break;
                        }
                  } while (!terminal);
                  break;
#endif /* INET6 */
            }

            switch (pd2.proto) {
            case IPPROTO_TCP: {
                  struct tcphdr            th;
                  u_int32_t          seq;
                  struct pf_state          key;
                  struct pf_state_peer    *src, *dst;
                  u_int8_t           dws;
                  int                copyback = 0;

                  /*
                   * Only the first 8 bytes of the TCP header can be
                   * expected. Don't access any TCP header fields after
                   * th_seq, an ackskew test is not possible.
                   */
                  if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
                      pd2.af)) {
                        DPFPRINTF(PF_DEBUG_MISC,
                            ("pf: ICMP error message too short "
                            "(tcp)\n"));
                        return (PF_DROP);
                  }

                  key.af = pd2.af;
                  key.proto = IPPROTO_TCP;
                  if (direction == PF_IN) {
                        PF_ACPY(&key.ext.addr, pd2.dst, key.af);
                        PF_ACPY(&key.gwy.addr, pd2.src, key.af);
                        key.ext.port = th.th_dport;
                        key.gwy.port = th.th_sport;
                  } else {
                        PF_ACPY(&key.lan.addr, pd2.dst, key.af);
                        PF_ACPY(&key.ext.addr, pd2.src, key.af);
                        key.lan.port = th.th_dport;
                        key.ext.port = th.th_sport;
                  }

                  STATE_LOOKUP();

                  if (direction == (*state)->direction) {
                        src = &(*state)->dst;
                        dst = &(*state)->src;
                  } else {
                        src = &(*state)->src;
                        dst = &(*state)->dst;
                  }

                  if (src->wscale && dst->wscale)
                        dws = dst->wscale & PF_WSCALE_MASK;
                  else
                        dws = 0;

                  /* Demodulate sequence number */
                  seq = ntohl(th.th_seq) - src->seqdiff;
                  if (src->seqdiff) {
                        pf_change_a(&th.th_seq, icmpsum,
                            htonl(seq), 0);
                        copyback = 1;
                  }

                  if (!SEQ_GEQ(src->seqhi, seq) ||
                      !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
                        if (pf_status.debug >= PF_DEBUG_MISC) {
                              printf("pf: BAD ICMP %d:%d ",
                                  icmptype, pd->hdr.icmp->icmp_code);
                              pf_print_host(pd->src, 0, pd->af);
                              printf(" -> ");
                              pf_print_host(pd->dst, 0, pd->af);
                              printf(" state: ");
                              pf_print_state(*state);
                              printf(" seq=%u\n", seq);
                        }
                        REASON_SET(reason, PFRES_BADSTATE);
                        return (PF_DROP);
                  }

                  if (STATE_TRANSLATE(*state)) {
                        if (direction == PF_IN) {
                              pf_change_icmp(pd2.src, &th.th_sport,
                                  daddr, &(*state)->lan.addr,
                                  (*state)->lan.port, NULL,
                                  pd2.ip_sum, icmpsum,
                                  pd->ip_sum, 0, pd2.af);
                        } else {
                              pf_change_icmp(pd2.dst, &th.th_dport,
                                  saddr, &(*state)->gwy.addr,
                                  (*state)->gwy.port, NULL,
                                  pd2.ip_sum, icmpsum,
                                  pd->ip_sum, 0, pd2.af);
                        }
                        copyback = 1;
                  }

                  if (copyback) {
                        switch (pd2.af) {
#ifdef INET
                        case AF_INET:
                              m_copyback(m, off, ICMP_MINLEN,
                                  (caddr_t)pd->hdr.icmp);
                              m_copyback(m, ipoff2, sizeof(h2),
                                  (caddr_t)&h2);
                              break;
#endif /* INET */
#ifdef INET6
                        case AF_INET6:
                              m_copyback(m, off,
                                  sizeof(struct icmp6_hdr),
                                  (caddr_t)pd->hdr.icmp6);
                              m_copyback(m, ipoff2, sizeof(h2_6),
                                  (caddr_t)&h2_6);
                              break;
#endif /* INET6 */
                        }
                        m_copyback(m, off2, 8, (caddr_t)&th);
                  }

                  return (PF_PASS);
                  break;
            }
            case IPPROTO_UDP: {
                  struct udphdr           uh;
                  struct pf_state         key;

                  if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
                      NULL, reason, pd2.af)) {
                        DPFPRINTF(PF_DEBUG_MISC,
                            ("pf: ICMP error message too short "
                            "(udp)\n"));
                        return (PF_DROP);
                  }

                  key.af = pd2.af;
                  key.proto = IPPROTO_UDP;
                  if (direction == PF_IN) {
                        PF_ACPY(&key.ext.addr, pd2.dst, key.af);
                        PF_ACPY(&key.gwy.addr, pd2.src, key.af);
                        key.ext.port = uh.uh_dport;
                        key.gwy.port = uh.uh_sport;
                  } else {
                        PF_ACPY(&key.lan.addr, pd2.dst, key.af);
                        PF_ACPY(&key.ext.addr, pd2.src, key.af);
                        key.lan.port = uh.uh_dport;
                        key.ext.port = uh.uh_sport;
                  }

                  STATE_LOOKUP();

                  if (STATE_TRANSLATE(*state)) {
                        if (direction == PF_IN) {
                              pf_change_icmp(pd2.src, &uh.uh_sport,
                                  daddr, &(*state)->lan.addr,
                                  (*state)->lan.port, &uh.uh_sum,
                                  pd2.ip_sum, icmpsum,
                                  pd->ip_sum, 1, pd2.af);
                        } else {
                              pf_change_icmp(pd2.dst, &uh.uh_dport,
                                  saddr, &(*state)->gwy.addr,
                                  (*state)->gwy.port, &uh.uh_sum,
                                  pd2.ip_sum, icmpsum,
                                  pd->ip_sum, 1, pd2.af);
                        }
                        switch (pd2.af) {
#ifdef INET
                        case AF_INET:
                              m_copyback(m, off, ICMP_MINLEN,
                                  (caddr_t)pd->hdr.icmp);
                              m_copyback(m, ipoff2, sizeof(h2),
                                  (caddr_t)&h2);
                              break;
#endif /* INET */
#ifdef INET6
                        case AF_INET6:
                              m_copyback(m, off,
                                  sizeof(struct icmp6_hdr),
                                  (caddr_t)pd->hdr.icmp6);
                              m_copyback(m, ipoff2, sizeof(h2_6),
                                  (caddr_t)&h2_6);
                              break;
#endif /* INET6 */
                        }
                        m_copyback(m, off2, sizeof(uh),
                            (caddr_t)&uh);
                  }

                  return (PF_PASS);
                  break;
            }
#ifdef INET
            case IPPROTO_ICMP: {
                  struct icmp       iih;
                  struct pf_state         key;

                  if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
                      NULL, reason, pd2.af)) {
                        DPFPRINTF(PF_DEBUG_MISC,
                            ("pf: ICMP error message too short i"
                            "(icmp)\n"));
                        return (PF_DROP);
                  }

                  key.af = pd2.af;
                  key.proto = IPPROTO_ICMP;
                  if (direction == PF_IN) {
                        PF_ACPY(&key.ext.addr, pd2.dst, key.af);
                        PF_ACPY(&key.gwy.addr, pd2.src, key.af);
                        key.ext.port = 0;
                        key.gwy.port = iih.icmp_id;
                  } else {
                        PF_ACPY(&key.lan.addr, pd2.dst, key.af);
                        PF_ACPY(&key.ext.addr, pd2.src, key.af);
                        key.lan.port = iih.icmp_id;
                        key.ext.port = 0;
                  }

                  STATE_LOOKUP();

                  if (STATE_TRANSLATE(*state)) {
                        if (direction == PF_IN) {
                              pf_change_icmp(pd2.src, &iih.icmp_id,
                                  daddr, &(*state)->lan.addr,
                                  (*state)->lan.port, NULL,
                                  pd2.ip_sum, icmpsum,
                                  pd->ip_sum, 0, AF_INET);
                        } else {
                              pf_change_icmp(pd2.dst, &iih.icmp_id,
                                  saddr, &(*state)->gwy.addr,
                                  (*state)->gwy.port, NULL,
                                  pd2.ip_sum, icmpsum,
                                  pd->ip_sum, 0, AF_INET);
                        }
                        m_copyback(m, off, ICMP_MINLEN,
                            (caddr_t)pd->hdr.icmp);
                        m_copyback(m, ipoff2, sizeof(h2),
                            (caddr_t)&h2);
                        m_copyback(m, off2, ICMP_MINLEN,
                            (caddr_t)&iih);
                  }

                  return (PF_PASS);
                  break;
            }
#endif /* INET */
#ifdef INET6
            case IPPROTO_ICMPV6: {
                  struct icmp6_hdr  iih;
                  struct pf_state         key;

                  if (!pf_pull_hdr(m, off2, &iih,
                      sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
                        DPFPRINTF(PF_DEBUG_MISC,
                            ("pf: ICMP error message too short "
                            "(icmp6)\n"));
                        return (PF_DROP);
                  }

                  key.af = pd2.af;
                  key.proto = IPPROTO_ICMPV6;
                  if (direction == PF_IN) {
                        PF_ACPY(&key.ext.addr, pd2.dst, key.af);
                        PF_ACPY(&key.gwy.addr, pd2.src, key.af);
                        key.ext.port = 0;
                        key.gwy.port = iih.icmp6_id;
                  } else {
                        PF_ACPY(&key.lan.addr, pd2.dst, key.af);
                        PF_ACPY(&key.ext.addr, pd2.src, key.af);
                        key.lan.port = iih.icmp6_id;
                        key.ext.port = 0;
                  }

                  STATE_LOOKUP();

                  if (STATE_TRANSLATE(*state)) {
                        if (direction == PF_IN) {
                              pf_change_icmp(pd2.src, &iih.icmp6_id,
                                  daddr, &(*state)->lan.addr,
                                  (*state)->lan.port, NULL,
                                  pd2.ip_sum, icmpsum,
                                  pd->ip_sum, 0, AF_INET6);
                        } else {
                              pf_change_icmp(pd2.dst, &iih.icmp6_id,
                                  saddr, &(*state)->gwy.addr,
                                  (*state)->gwy.port, NULL,
                                  pd2.ip_sum, icmpsum,
                                  pd->ip_sum, 0, AF_INET6);
                        }
                        m_copyback(m, off, sizeof(struct icmp6_hdr),
                            (caddr_t)pd->hdr.icmp6);
                        m_copyback(m, ipoff2, sizeof(h2_6),
                            (caddr_t)&h2_6);
                        m_copyback(m, off2, sizeof(struct icmp6_hdr),
                            (caddr_t)&iih);
                  }

                  return (PF_PASS);
                  break;
            }
#endif /* INET6 */
            default: {
                  struct pf_state         key;

                  key.af = pd2.af;
                  key.proto = pd2.proto;
                  if (direction == PF_IN) {
                        PF_ACPY(&key.ext.addr, pd2.dst, key.af);
                        PF_ACPY(&key.gwy.addr, pd2.src, key.af);
                        key.ext.port = 0;
                        key.gwy.port = 0;
                  } else {
                        PF_ACPY(&key.lan.addr, pd2.dst, key.af);
                        PF_ACPY(&key.ext.addr, pd2.src, key.af);
                        key.lan.port = 0;
                        key.ext.port = 0;
                  }

                  STATE_LOOKUP();

                  if (STATE_TRANSLATE(*state)) {
                        if (direction == PF_IN) {
                              pf_change_icmp(pd2.src, NULL,
                                  daddr, &(*state)->lan.addr,
                                  0, NULL,
                                  pd2.ip_sum, icmpsum,
                                  pd->ip_sum, 0, pd2.af);
                        } else {
                              pf_change_icmp(pd2.dst, NULL,
                                  saddr, &(*state)->gwy.addr,
                                  0, NULL,
                                  pd2.ip_sum, icmpsum,
                                  pd->ip_sum, 0, pd2.af);
                        }
                        switch (pd2.af) {
#ifdef INET
                        case AF_INET:
                              m_copyback(m, off, ICMP_MINLEN,
                                  (caddr_t)pd->hdr.icmp);
                              m_copyback(m, ipoff2, sizeof(h2),
                                  (caddr_t)&h2);
                              break;
#endif /* INET */
#ifdef INET6
                        case AF_INET6:
                              m_copyback(m, off,
                                  sizeof(struct icmp6_hdr),
                                  (caddr_t)pd->hdr.icmp6);
                              m_copyback(m, ipoff2, sizeof(h2_6),
                                  (caddr_t)&h2_6);
                              break;
#endif /* INET6 */
                        }
                  }

                  return (PF_PASS);
                  break;
            }
            }
      }
}

int
pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
    struct pf_pdesc *pd)
{
      struct pf_state_peer    *src, *dst;
      struct pf_state          key;

      key.af = pd->af;
      key.proto = pd->proto;
      if (direction == PF_IN) {
            PF_ACPY(&key.ext.addr, pd->src, key.af);
            PF_ACPY(&key.gwy.addr, pd->dst, key.af);
            key.ext.port = 0;
            key.gwy.port = 0;
      } else {
            PF_ACPY(&key.lan.addr, pd->src, key.af);
            PF_ACPY(&key.ext.addr, pd->dst, key.af);
            key.lan.port = 0;
            key.ext.port = 0;
      }

      STATE_LOOKUP();

      if (direction == (*state)->direction) {
            src = &(*state)->src;
            dst = &(*state)->dst;
      } else {
            src = &(*state)->dst;
            dst = &(*state)->src;
      }

      /* update states */
      if (src->state < PFOTHERS_SINGLE)
            src->state = PFOTHERS_SINGLE;
      if (dst->state == PFOTHERS_SINGLE)
            dst->state = PFOTHERS_MULTIPLE;

      /* update expire time */
      (*state)->expire = time_second;
      if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
            (*state)->timeout = PFTM_OTHER_MULTIPLE;
      else
            (*state)->timeout = PFTM_OTHER_SINGLE;

      /* translate source/destination address, if necessary */
      if (STATE_TRANSLATE(*state)) {
            if (direction == PF_OUT)
                  switch (pd->af) {
#ifdef INET
                  case AF_INET:
                        pf_change_a(&pd->src->v4.s_addr,
                            pd->ip_sum, (*state)->gwy.addr.v4.s_addr,
                            0);
                        break;
#endif /* INET */
#ifdef INET6
                  case AF_INET6:
                        PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af);
                        break;
#endif /* INET6 */
                  }
            else
                  switch (pd->af) {
#ifdef INET
                  case AF_INET:
                        pf_change_a(&pd->dst->v4.s_addr,
                            pd->ip_sum, (*state)->lan.addr.v4.s_addr,
                            0);
                        break;
#endif /* INET */
#ifdef INET6
                  case AF_INET6:
                        PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af);
                        break;
#endif /* INET6 */
                  }
      }

      return (PF_PASS);
}

/*
 * ipoff and off are measured from the start of the mbuf chain.
 * h must be at "ipoff" on the mbuf chain.
 */
void *
pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
    u_short *actionp, u_short *reasonp, sa_family_t af)
{
      switch (af) {
#ifdef INET
      case AF_INET: {
            struct ip   *h = mtod(m, struct ip *);
            u_int16_t    fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;

            if (fragoff) {
                  if (fragoff >= len)
                        ACTION_SET(actionp, PF_PASS);
                  else {
                        ACTION_SET(actionp, PF_DROP);
                        REASON_SET(reasonp, PFRES_FRAG);
                  }
                  return (NULL);
            }
            if (m->m_pkthdr.len < off + len ||
                ntohs(h->ip_len) < off + len) {
                  ACTION_SET(actionp, PF_DROP);
                  REASON_SET(reasonp, PFRES_SHORT);
                  return (NULL);
            }
            break;
      }
#endif /* INET */
#ifdef INET6
      case AF_INET6: {
            struct ip6_hdr    *h = mtod(m, struct ip6_hdr *);

            if (m->m_pkthdr.len < off + len ||
                (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
                (unsigned)(off + len)) {
                  ACTION_SET(actionp, PF_DROP);
                  REASON_SET(reasonp, PFRES_SHORT);
                  return (NULL);
            }
            break;
      }
#endif /* INET6 */
      }
      m_copydata(m, off, len, p);
      return (p);
}

int
pf_routable(struct pf_addr *addr, sa_family_t af)
{
      struct sockaddr_in      *dst;
#ifdef INET6
      struct sockaddr_in6     *dst6;
      struct route_in6   ro;
#else
      struct route             ro;
#endif

      bzero(&ro, sizeof(ro));
      switch (af) {
      case AF_INET:
            dst = satosin(&ro.ro_dst);
            dst->sin_family = AF_INET;
            dst->sin_len = sizeof(*dst);
            dst->sin_addr = addr->v4;
            break;
#ifdef INET6
      case AF_INET6:
            dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
            dst6->sin6_family = AF_INET6;
            dst6->sin6_len = sizeof(*dst6);
            dst6->sin6_addr = addr->v6;
            break;
#endif /* INET6 */
      default:
            return (0);
      }

#ifdef __FreeBSD__
#ifdef RTF_PRCLONING
      rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING));
#else /* !RTF_PRCLONING */
      rtalloc_ign((struct route *)&ro, RTF_CLONING);
#endif
#else /* ! __FreeBSD__ */
      rtalloc_noclone((struct route *)&ro, NO_CLONING);
#endif

      if (ro.ro_rt != NULL) {
            RTFREE(ro.ro_rt);
            return (1);
      }

      return (0);
}

int
pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
{
      struct sockaddr_in      *dst;
#ifdef INET6
      struct sockaddr_in6     *dst6;
      struct route_in6   ro;
#else
      struct route             ro;
#endif
      int                ret = 0;

      bzero(&ro, sizeof(ro));
      switch (af) {
      case AF_INET:
            dst = satosin(&ro.ro_dst);
            dst->sin_family = AF_INET;
            dst->sin_len = sizeof(*dst);
            dst->sin_addr = addr->v4;
            break;
#ifdef INET6
      case AF_INET6:
            dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
            dst6->sin6_family = AF_INET6;
            dst6->sin6_len = sizeof(*dst6);
            dst6->sin6_addr = addr->v6;
            break;
#endif /* INET6 */
      default:
            return (0);
      }

#ifdef __FreeBSD__
# ifdef RTF_PRCLONING
      rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING));
# else /* !RTF_PRCLONING */
      rtalloc_ign((struct route *)&ro, RTF_CLONING);
# endif
#else /* ! __FreeBSD__ */
      rtalloc_noclone((struct route *)&ro, NO_CLONING);
#endif

      if (ro.ro_rt != NULL) {
#ifdef __FreeBSD__
            /* XXX_IMPORT: later */
#else
            if (ro.ro_rt->rt_labelid == aw->v.rtlabel)
                  ret = 1;
#endif
            RTFREE(ro.ro_rt);
      }

      return (ret);
}

#ifdef INET

void
pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
    struct pf_state *s)
{
      struct mbuf       *m0, *m1;
      struct m_tag            *mtag;
      struct route             iproute;
      struct route            *ro = NULL; /* XXX: was uninitialized */
      struct sockaddr_in      *dst;
      struct ip         *ip;
      struct ifnet            *ifp = NULL;
      struct pf_addr           naddr;
      struct pf_src_node      *sn = NULL;
      int                error = 0;
#ifdef __FreeBSD__
      int sw_csum;
#endif

      if (m == NULL || *m == NULL || r == NULL ||
          (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
            panic("pf_route: invalid parameters");

      if ((mtag = m_tag_find(*m, PACKET_TAG_PF_ROUTED, NULL)) == NULL) {
            if ((mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 1, M_NOWAIT)) ==
                NULL) {
                  m0 = *m;
                  *m = NULL;
                  goto bad;
            }
            *(char *)(mtag + 1) = 1;
            m_tag_prepend(*m, mtag);
      } else {
            if (*(char *)(mtag + 1) > 3) {
                  m0 = *m;
                  *m = NULL;
                  goto bad;
            }
            (*(char *)(mtag + 1))++;
      }

      if (r->rt == PF_DUPTO) {
#ifdef __FreeBSD__
            if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL)
#else
            if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
#endif
                  return;
      } else {
            if ((r->rt == PF_REPLYTO) == (r->direction == dir))
                  return;
            m0 = *m;
      }

      if (m0->m_len < sizeof(struct ip)) {
            DPFPRINTF(PF_DEBUG_URGENT,
                ("pf_route: m0->m_len < sizeof(struct ip)\n"));
            goto bad;
      }

      ip = mtod(m0, struct ip *);

      ro = &iproute;
      bzero((caddr_t)ro, sizeof(*ro));
      dst = satosin(&ro->ro_dst);
      dst->sin_family = AF_INET;
      dst->sin_len = sizeof(*dst);
      dst->sin_addr = ip->ip_dst;

      if (r->rt == PF_FASTROUTE) {
            rtalloc(ro);
            if (ro->ro_rt == 0) {
                  ipstat.ips_noroute++;
                  goto bad;
            }

            ifp = ro->ro_rt->rt_ifp;
            ro->ro_rt->rt_use++;

            if (ro->ro_rt->rt_flags & RTF_GATEWAY)
                  dst = satosin(ro->ro_rt->rt_gateway);
      } else {
            if (TAILQ_EMPTY(&r->rpool.list)) {
                  DPFPRINTF(PF_DEBUG_URGENT,
                      ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
                  goto bad;
            }
            if (s == NULL) {
                  pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
                      &naddr, NULL, &sn);
                  if (!PF_AZERO(&naddr, AF_INET))
                        dst->sin_addr.s_addr = naddr.v4.s_addr;
                  ifp = r->rpool.cur->kif ?
                      r->rpool.cur->kif->pfik_ifp : NULL;
            } else {
                  if (!PF_AZERO(&s->rt_addr, AF_INET))
                        dst->sin_addr.s_addr =
                            s->rt_addr.v4.s_addr;
                  ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
            }
      }
      if (ifp == NULL)
            goto bad;

      if (oifp != ifp) {
#ifdef __FreeBSD__
            PF_UNLOCK();
            if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
                  PF_LOCK();
                  goto bad;
            } else if (m0 == NULL) {
                  PF_LOCK();
                  goto done;
            }
            PF_LOCK();
#else
            if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS)
                  goto bad;
            else if (m0 == NULL)
                  goto done;
#endif
            if (m0->m_len < sizeof(struct ip)) {
                  DPFPRINTF(PF_DEBUG_URGENT,
                      ("pf_route: m0->m_len < sizeof(struct ip)\n"));
                  goto bad;
            }
            ip = mtod(m0, struct ip *);
      }

#ifdef __FreeBSD__
      /* Copied from FreeBSD 5.1-CURRENT ip_output. */
      m0->m_pkthdr.csum_flags |= CSUM_IP;
      sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
      if (sw_csum & CSUM_DELAY_DATA) {
            /*
             * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least)
             */
            NTOHS(ip->ip_len);
            NTOHS(ip->ip_off);       /* XXX: needed? */
            in_delayed_cksum(m0);
            HTONS(ip->ip_len);
            HTONS(ip->ip_off);
            sw_csum &= ~CSUM_DELAY_DATA;
      }
      m0->m_pkthdr.csum_flags &= ifp->if_hwassist;

      if (ntohs(ip->ip_len) <= ifp->if_mtu ||
          (ifp->if_hwassist & CSUM_FRAGMENT &&
            ((ip->ip_off & htons(IP_DF)) == 0))) {
            /*
             * ip->ip_len = htons(ip->ip_len);
             * ip->ip_off = htons(ip->ip_off);
             */
            ip->ip_sum = 0;
            if (sw_csum & CSUM_DELAY_IP) {
                  /* From KAME */
                  if (ip->ip_v == IPVERSION &&
                      (ip->ip_hl << 2) == sizeof(*ip)) {
                        ip->ip_sum = in_cksum_hdr(ip);
                  } else {
                        ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
                  }
            }
            PF_UNLOCK();
            error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt);
            PF_LOCK();
            goto done;
      }

#else
      /* Copied from ip_output. */
#ifdef IPSEC
      /*
       * If deferred crypto processing is needed, check that the
       * interface supports it.
       */
      if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL))
          != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) {
            /* Notify IPsec to do its own crypto. */
            ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1));
            goto bad;
      }
#endif /* IPSEC */

      /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */
      if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT) {
            if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) ||
                ifp->if_bridge != NULL) {
                  in_delayed_cksum(m0);
                  m0->m_pkthdr.csum &= ~M_TCPV4_CSUM_OUT; /* Clear */
            }
      } else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT) {
            if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) ||
                ifp->if_bridge != NULL) {
                  in_delayed_cksum(m0);
                  m0->m_pkthdr.csum &= ~M_UDPV4_CSUM_OUT; /* Clear */
            }
      }

      if (ntohs(ip->ip_len) <= ifp->if_mtu) {
            if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) &&
                ifp->if_bridge == NULL) {
                  m0->m_pkthdr.csum |= M_IPV4_CSUM_OUT;
                  ipstat.ips_outhwcsum++;
            } else {
                  ip->ip_sum = 0;
                  ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
            }
            /* Update relevant hardware checksum stats for TCP/UDP */
            if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT)
                  tcpstat.tcps_outhwcsum++;
            else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT)
                  udpstat.udps_outhwcsum++;
            error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL);
            goto done;
      }
#endif
      /*
       * Too large for interface; fragment if possible.
       * Must be able to put at least 8 bytes per fragment.
       */
      if (ip->ip_off & htons(IP_DF)) {
            ipstat.ips_cantfrag++;
            if (r->rt != PF_DUPTO) {
#ifdef __FreeBSD__
                  /* icmp_error() expects host byte ordering */
                  NTOHS(ip->ip_len);
                  NTOHS(ip->ip_off);
                  PF_UNLOCK();
                  icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
                      ifp->if_mtu);
                  PF_LOCK();
#else
                  icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
                      ifp);
#endif
                  goto done;
            } else
                  goto bad;
      }

      m1 = m0;
#ifdef __FreeBSD__
      /*
       * XXX: is cheaper + less error prone than own function
       */
      NTOHS(ip->ip_len);
      NTOHS(ip->ip_off);
      error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
#else
      error = ip_fragment(m0, ifp, ifp->if_mtu);
#endif
      if (error) {
#ifndef __FreeBSD__     /* ip_fragment does not do m_freem() on FreeBSD */
            m0 = NULL;
#endif
            goto bad;
      }

      for (m0 = m1; m0; m0 = m1) {
            m1 = m0->m_nextpkt;
            m0->m_nextpkt = 0;
#ifdef __FreeBSD__
            if (error == 0) {
                  PF_UNLOCK();
                  error = (*ifp->if_output)(ifp, m0, sintosa(dst),
                      NULL);
                  PF_LOCK();
            } else
#else
            if (error == 0)
                  error = (*ifp->if_output)(ifp, m0, sintosa(dst),
                      NULL);
            else
#endif
                  m_freem(m0);
      }

      if (error == 0)
            ipstat.ips_fragmented++;

done:
      if (r->rt != PF_DUPTO)
            *m = NULL;
      if (ro == &iproute && ro->ro_rt)
            RTFREE(ro->ro_rt);
      return;

bad:
      m_freem(m0);
      goto done;
}
#endif /* INET */

#ifdef INET6
void
pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
    struct pf_state *s)
{
      struct mbuf       *m0;
      struct m_tag            *mtag;
      struct route_in6   ip6route;
      struct route_in6  *ro;
      struct sockaddr_in6     *dst;
      struct ip6_hdr          *ip6;
      struct ifnet            *ifp = NULL;
      struct pf_addr           naddr;
      struct pf_src_node      *sn = NULL;
      int                error = 0;

      if (m == NULL || *m == NULL || r == NULL ||
          (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
            panic("pf_route6: invalid parameters");

      if ((mtag = m_tag_find(*m, PACKET_TAG_PF_ROUTED, NULL)) == NULL) {
            if ((mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 1, M_NOWAIT)) ==
                NULL) {
                  m0 = *m;
                  *m = NULL;
                  goto bad;
            }
            *(char *)(mtag + 1) = 1;
            m_tag_prepend(*m, mtag);
      } else {
            if (*(char *)(mtag + 1) > 3) {
                  m0 = *m;
                  *m = NULL;
                  goto bad;
            }
            (*(char *)(mtag + 1))++;
      }

      if (r->rt == PF_DUPTO) {
#ifdef __FreeBSD__
            if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL)
#else
            if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
#endif
                  return;
      } else {
            if ((r->rt == PF_REPLYTO) == (r->direction == dir))
                  return;
            m0 = *m;
      }

      if (m0->m_len < sizeof(struct ip6_hdr)) {
            DPFPRINTF(PF_DEBUG_URGENT,
                ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
            goto bad;
      }
      ip6 = mtod(m0, struct ip6_hdr *);

      ro = &ip6route;
      bzero((caddr_t)ro, sizeof(*ro));
      dst = (struct sockaddr_in6 *)&ro->ro_dst;
      dst->sin6_family = AF_INET6;
      dst->sin6_len = sizeof(*dst);
      dst->sin6_addr = ip6->ip6_dst;

      /* Cheat. */
      if (r->rt == PF_FASTROUTE) {
#ifdef __FreeBSD__
            m0->m_flags |= M_SKIP_FIREWALL;
            PF_UNLOCK();
            ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
            PF_LOCK();
#else
            mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
            if (mtag == NULL)
                  goto bad;
            m_tag_prepend(m0, mtag);
            ip6_output(m0, NULL, NULL, 0, NULL, NULL);
#endif
            return;
      }

      if (TAILQ_EMPTY(&r->rpool.list)) {
            DPFPRINTF(PF_DEBUG_URGENT,
                ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
            goto bad;
      }
      if (s == NULL) {
            pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
                &naddr, NULL, &sn);
            if (!PF_AZERO(&naddr, AF_INET6))
                  PF_ACPY((struct pf_addr *)&dst->sin6_addr,
                      &naddr, AF_INET6);
            ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
      } else {
            if (!PF_AZERO(&s->rt_addr, AF_INET6))
                  PF_ACPY((struct pf_addr *)&dst->sin6_addr,
                      &s->rt_addr, AF_INET6);
            ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
      }
      if (ifp == NULL)
            goto bad;

      if (oifp != ifp) {
#ifdef __FreeBSD__
            PF_UNLOCK();
            if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
                  PF_LOCK();
                  goto bad;
            } else if (m0 == NULL) {
                  PF_LOCK();
                  goto done;
            }
            PF_LOCK();
#else
            if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS)
                  goto bad;
            else if (m0 == NULL)
                  goto done;
#endif
            if (m0->m_len < sizeof(struct ip6_hdr)) {
                  DPFPRINTF(PF_DEBUG_URGENT,
                      ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
                  goto bad;
            }
            ip6 = mtod(m0, struct ip6_hdr *);
      }

      /*
       * If the packet is too large for the outgoing interface,
       * send back an icmp6 error.
       */
      if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
            dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
      if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
#ifdef __FreeBSD__
            PF_UNLOCK();
#endif
            error = nd6_output(ifp, ifp, m0, dst, NULL);
#ifdef __FreeBSD__
            PF_LOCK();
#endif
      } else {
            in6_ifstat_inc(ifp, ifs6_in_toobig);
#ifdef __FreeBSD__
            if (r->rt != PF_DUPTO) {
                  PF_UNLOCK();
                  icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
                  PF_LOCK();
             } else
#else
            if (r->rt != PF_DUPTO)
                  icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
            else
#endif
                  goto bad;
      }

done:
      if (r->rt != PF_DUPTO)
            *m = NULL;
      return;

bad:
      m_freem(m0);
      goto done;
}
#endif /* INET6 */


#ifdef __FreeBSD__
/*
 * FreeBSD supports cksum offloads for the following drivers.
 *  em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4),
 *   ti(4), txp(4), xl(4)
 *
 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
 *  network driver performed cksum including pseudo header, need to verify
 *   csum_data
 * CSUM_DATA_VALID :
 *  network driver performed cksum, needs to additional pseudo header
 *  cksum computation with partial csum_data(i.e. lack of H/W support for
 *  pseudo header, for instance hme(4), sk(4) and possibly gem(4))
 *
 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
 * TCP/UDP layer.
 * Also, set csum_data to 0xffff to force cksum validation.
 */
int
pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
{
      u_int16_t sum = 0;
      int hw_assist = 0;
      struct ip *ip;

      if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
            return (1);
      if (m->m_pkthdr.len < off + len)
            return (1);

      switch (p) {
      case IPPROTO_TCP:
            if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
                  if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
                        sum = m->m_pkthdr.csum_data;
                  } else {
                        ip = mtod(m, struct ip *);    
                        sum = in_pseudo(ip->ip_src.s_addr,
                              ip->ip_dst.s_addr, htonl((u_short)len + 
                              m->m_pkthdr.csum_data + IPPROTO_TCP));
                  }
                  sum ^= 0xffff;
                  ++hw_assist;
            }
            break;
      case IPPROTO_UDP:
            if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
                  if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
                        sum = m->m_pkthdr.csum_data;
                  } else {
                        ip = mtod(m, struct ip *);    
                        sum = in_pseudo(ip->ip_src.s_addr,
                              ip->ip_dst.s_addr, htonl((u_short)len +
                              m->m_pkthdr.csum_data + IPPROTO_UDP));
                  }
                  sum ^= 0xffff;
                  ++hw_assist;
                }
            break;
      case IPPROTO_ICMP:
#ifdef INET6
      case IPPROTO_ICMPV6:
#endif /* INET6 */
            break;
      default:
            return (1);
      }

      if (!hw_assist) {
            switch (af) {
            case AF_INET:
                  if (p == IPPROTO_ICMP) {
                        if (m->m_len < off)
                              return (1);
                        m->m_data += off;
                        m->m_len -= off;
                        sum = in_cksum(m, len);
                        m->m_data -= off;
                        m->m_len += off;
                  } else {
                        if (m->m_len < sizeof(struct ip))
                              return (1);
                        sum = in4_cksum(m, p, off, len);
                  }
                  break;
#ifdef INET6
            case AF_INET6:
                  if (m->m_len < sizeof(struct ip6_hdr))
                        return (1);
                  sum = in6_cksum(m, p, off, len);
                  break;
#endif /* INET6 */
            default:
                  return (1);
            }
      }
      if (sum) {
            switch (p) {
            case IPPROTO_TCP:
                  tcpstat.tcps_rcvbadsum++;
                  break;
            case IPPROTO_UDP:
                  udpstat.udps_badsum++;
                  break;
            case IPPROTO_ICMP:
                  icmpstat.icps_checksum++;
                  break;
#ifdef INET6
            case IPPROTO_ICMPV6:
                  icmp6stat.icp6s_checksum++;
                  break;
#endif /* INET6 */
            }
            return (1);
      } else {
            if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
                  m->m_pkthdr.csum_flags |=
                      (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
                  m->m_pkthdr.csum_data = 0xffff;
            }
      }
      return (0);
}
#else
/*
 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
 *   off is the offset where the protocol header starts
 *   len is the total length of protocol header plus payload
 * returns 0 when the checksum is valid, otherwise returns 1.
 */
int
pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
    sa_family_t af)
{
      u_int16_t flag_ok, flag_bad;
      u_int16_t sum;

      switch (p) {
      case IPPROTO_TCP:
            flag_ok = M_TCP_CSUM_IN_OK;
            flag_bad = M_TCP_CSUM_IN_BAD;
            break;
      case IPPROTO_UDP:
            flag_ok = M_UDP_CSUM_IN_OK;
            flag_bad = M_UDP_CSUM_IN_BAD;
            break;
      case IPPROTO_ICMP:
#ifdef INET6
      case IPPROTO_ICMPV6:
#endif /* INET6 */
            flag_ok = flag_bad = 0;
            break;
      default:
            return (1);
      }
      if (m->m_pkthdr.csum & flag_ok)
            return (0);
      if (m->m_pkthdr.csum & flag_bad)
            return (1);
      if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
            return (1);
      if (m->m_pkthdr.len < off + len)
            return (1);
      switch (af) {
#ifdef INET
      case AF_INET:
            if (p == IPPROTO_ICMP) {
                  if (m->m_len < off)
                        return (1);
                  m->m_data += off;
                  m->m_len -= off;
                  sum = in_cksum(m, len);
                  m->m_data -= off;
                  m->m_len += off;
            } else {
                  if (m->m_len < sizeof(struct ip))
                        return (1);
                  sum = in4_cksum(m, p, off, len);
            }
            break;
#endif /* INET */
#ifdef INET6
      case AF_INET6:
            if (m->m_len < sizeof(struct ip6_hdr))
                  return (1);
            sum = in6_cksum(m, p, off, len);
            break;
#endif /* INET6 */
      default:
            return (1);
      }
      if (sum) {
            m->m_pkthdr.csum |= flag_bad;
            switch (p) {
            case IPPROTO_TCP:
                  tcpstat.tcps_rcvbadsum++;
                  break;
            case IPPROTO_UDP:
                  udpstat.udps_badsum++;
                  break;
            case IPPROTO_ICMP:
                  icmpstat.icps_checksum++;
                  break;
#ifdef INET6
            case IPPROTO_ICMPV6:
                  icmp6stat.icp6s_checksum++;
                  break;
#endif /* INET6 */
            }
            return (1);
      }
      m->m_pkthdr.csum |= flag_ok;
      return (0);
}
#endif

static int
pf_add_mbuf_tag(struct mbuf *m, u_int tag)
{
      struct m_tag *mtag;

      if (m_tag_find(m, tag, NULL) != NULL)
            return (0);
      mtag = m_tag_get(tag, 0, M_NOWAIT);
      if (mtag == NULL)
            return (1);
      m_tag_prepend(m, mtag);
      return (0);
}

#ifdef INET
int
#ifdef __FreeBSD__
pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
    struct ether_header *eh, struct inpcb *inp)
#else
pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
    struct ether_header *eh)
#endif
{
      struct pfi_kif          *kif;
      u_short                  action, reason = 0, log = 0;
      struct mbuf       *m = *m0;
      struct ip         *h = NULL;  /* make the compiler happy */
      struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
      struct pf_state         *s = NULL;
      struct pf_ruleset *ruleset = NULL;
      struct pf_pdesc          pd;
      int                off, dirndx, pqid = 0;

#ifdef __FreeBSD__
      PF_LOCK();
#endif
      if (!pf_status.running ||
#ifdef __FreeBSD__
          (m->m_flags & M_SKIP_FIREWALL)) {
            PF_UNLOCK();
#else
          (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) {
#endif
            return (PF_PASS);
      }

#ifdef __FreeBSD__
      /* XXX_IMPORT: later */
#else
      if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
            ifp = ifp->if_carpdev;
#endif

      kif = pfi_index2kif[ifp->if_index];
      if (kif == NULL) {
#ifdef __FreeBSD__
            PF_UNLOCK();
#endif
            DPFPRINTF(PF_DEBUG_URGENT,
                ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
            return (PF_DROP);
      }
      if (kif->pfik_flags & PFI_IFLAG_SKIP) {
#ifdef __FreeBSD__
            PF_UNLOCK();
#endif
            return (PF_PASS);
      }

#ifdef __FreeBSD__
      M_ASSERTPKTHDR(m);
#else
#ifdef DIAGNOSTIC
      if ((m->m_flags & M_PKTHDR) == 0)
            panic("non-M_PKTHDR is passed to pf_test");
#endif /* DIAGNOSTIC */
#endif /* __FreeBSD__ */

      memset(&pd, 0, sizeof(pd));
      if (m->m_pkthdr.len < (int)sizeof(*h)) {
            action = PF_DROP;
            REASON_SET(&reason, PFRES_SHORT);
            log = 1;
            goto done;
      }

      /* We do IP header normalization and packet reassembly here */
      if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
            action = PF_DROP;
            goto done;
      }
      m = *m0;
      h = mtod(m, struct ip *);

      off = h->ip_hl << 2;
      if (off < (int)sizeof(*h)) {
            action = PF_DROP;
            REASON_SET(&reason, PFRES_SHORT);
            log = 1;
            goto done;
      }

      pd.src = (struct pf_addr *)&h->ip_src;
      pd.dst = (struct pf_addr *)&h->ip_dst;
      PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
      pd.ip_sum = &h->ip_sum;
      pd.proto = h->ip_p;
      pd.af = AF_INET;
      pd.tos = h->ip_tos;
      pd.tot_len = ntohs(h->ip_len);
      pd.eh = eh;

      /* handle fragments that didn't get reassembled by normalization */
      if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
            action = pf_test_fragment(&r, dir, kif, m, h,
                &pd, &a, &ruleset);
            goto done;
      }

      switch (h->ip_p) {

      case IPPROTO_TCP: {
            struct tcphdr     th;

            pd.hdr.tcp = &th;
            if (!pf_pull_hdr(m, off, &th, sizeof(th),
                &action, &reason, AF_INET)) {
                  log = action != PF_PASS;
                  goto done;
            }
            if (dir == PF_IN && pf_check_proto_cksum(m, off,
                ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) {
                  action = PF_DROP;
                  goto done;
            }
            pd.p_len = pd.tot_len - off - (th.th_off << 2);
            if ((th.th_flags & TH_ACK) && pd.p_len == 0)
                  pqid = 1;
            action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
            if (action == PF_DROP)
                  goto done;
            action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
                &reason);
            if (action == PF_PASS) {
#if NPFSYNC
                  pfsync_update_state(s);
#endif /* NPFSYNC */
                  r = s->rule.ptr;
                  a = s->anchor.ptr;
                  log = s->log;
            } else if (s == NULL)
#ifdef __FreeBSD__
                  action = pf_test_tcp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, NULL, inp);
#else
                  action = pf_test_tcp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, &ipintrq);
#endif
            break;
      }

      case IPPROTO_UDP: {
            struct udphdr     uh;

            pd.hdr.udp = &uh;
            if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
                &action, &reason, AF_INET)) {
                  log = action != PF_PASS;
                  goto done;
            }
            if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
                off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) {
                  action = PF_DROP;
                  goto done;
            }
            if (uh.uh_dport == 0 ||
                ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
                ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
                  action = PF_DROP;
                  goto done;
            }
            action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
            if (action == PF_PASS) {
#if NPFSYNC
                  pfsync_update_state(s);
#endif /* NPFSYNC */
                  r = s->rule.ptr;
                  a = s->anchor.ptr;
                  log = s->log;
            } else if (s == NULL)
#ifdef __FreeBSD__
                  action = pf_test_udp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, NULL, inp);
#else
                  action = pf_test_udp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, &ipintrq);
#endif
            break;
      }

      case IPPROTO_ICMP: {
            struct icmp ih;

            pd.hdr.icmp = &ih;
            if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
                &action, &reason, AF_INET)) {
                  log = action != PF_PASS;
                  goto done;
            }
            if (dir == PF_IN && pf_check_proto_cksum(m, off,
                ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) {
                  action = PF_DROP;
                  goto done;
            }
            action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
                &reason);
            if (action == PF_PASS) {
#if NPFSYNC
                  pfsync_update_state(s);
#endif /* NPFSYNC */
                  r = s->rule.ptr;
                  a = s->anchor.ptr;
                  log = s->log;
            } else if (s == NULL)
#ifdef __FreeBSD__
                  action = pf_test_icmp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, NULL);
#else
                  action = pf_test_icmp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, &ipintrq);
#endif
            break;
      }

      default:
            action = pf_test_state_other(&s, dir, kif, &pd);
            if (action == PF_PASS) {
#if NPFSYNC
                  pfsync_update_state(s);
#endif /* NPFSYNC */
                  r = s->rule.ptr;
                  a = s->anchor.ptr;
                  log = s->log;
            } else if (s == NULL)
#ifdef __FreeBSD__
                  action = pf_test_other(&r, &s, dir, kif, m, off, h,
                      &pd, &a, &ruleset, NULL);
#else
                  action = pf_test_other(&r, &s, dir, kif, m, off, h,
                      &pd, &a, &ruleset, &ipintrq);
#endif
            break;
      }

done:
      if (action == PF_PASS && h->ip_hl > 5 &&
          !((s && s->allow_opts) || r->allow_opts)) {
            action = PF_DROP;
            REASON_SET(&reason, PFRES_IPOPTIONS);
            log = 1;
            DPFPRINTF(PF_DEBUG_MISC,
                ("pf: dropping packet with ip options\n"));
      }

      if (s && s->tag)
            pf_tag_packet(m, pf_get_tag(m), s->tag);

#ifdef ALTQ
      if (action == PF_PASS && r->qid) {
            struct m_tag      *mtag;
            struct altq_tag   *atag;

            mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
            if (mtag != NULL) {
                  atag = (struct altq_tag *)(mtag + 1);
                  if (pqid || pd.tos == IPTOS_LOWDELAY)
                        atag->qid = r->pqid;
                  else
                        atag->qid = r->qid;
                  /* add hints for ecn */
                  atag->af = AF_INET;
                  atag->hdr = h;
                  m_tag_prepend(m, mtag);
            }
      }
#endif /* ALTQ */

      /*
       * connections redirected to loopback should not match sockets
       * bound specifically to loopback due to security implications,
       * see tcp_input() and in_pcblookup_listen().
       */
      if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
          pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
          (s->nat_rule.ptr->action == PF_RDR ||
          s->nat_rule.ptr->action == PF_BINAT) &&
          (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET &&
          pf_add_mbuf_tag(m, PACKET_TAG_PF_TRANSLATE_LOCALHOST)) {
            action = PF_DROP;
            REASON_SET(&reason, PFRES_MEMORY);
      }

      if (log)
            PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset);

      kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
      kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;

      if (action == PF_PASS || r->action == PF_DROP) {
            r->packets++;
            r->bytes += pd.tot_len;
            if (a != NULL) {
                  a->packets++;
                  a->bytes += pd.tot_len;
            }
            if (s != NULL) {
                  dirndx = (dir == s->direction) ? 0 : 1;
                  s->packets[dirndx]++;
                  s->bytes[dirndx] += pd.tot_len;
                  if (s->nat_rule.ptr != NULL) {
                        s->nat_rule.ptr->packets++;
                        s->nat_rule.ptr->bytes += pd.tot_len;
                  }
                  if (s->src_node != NULL) {
                        s->src_node->packets++;
                        s->src_node->bytes += pd.tot_len;
                  }
                  if (s->nat_src_node != NULL) {
                        s->nat_src_node->packets++;
                        s->nat_src_node->bytes += pd.tot_len;
                  }
            }
            tr = r;
            nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
            if (nr != NULL) {
                  struct pf_addr *x;
                  /*
                   * XXX: we need to make sure that the addresses
                   * passed to pfr_update_stats() are the same than
                   * the addresses used during matching (pfr_match)
                   */
                  if (r == &pf_default_rule) {
                        tr = nr;
                        x = (s == NULL || s->direction == dir) ?
                            &pd.baddr : &pd.naddr;
                  } else
                        x = (s == NULL || s->direction == dir) ?
                            &pd.naddr : &pd.baddr;
                  if (x == &pd.baddr || s == NULL) {
                        /* we need to change the address */
                        if (dir == PF_OUT)
                              pd.src = x;
                        else
                              pd.dst = x;
                  }
            }
            if (tr->src.addr.type == PF_ADDR_TABLE)
                  pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
                      s->direction == dir) ? pd.src : pd.dst, pd.af,
                      pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
                      tr->src.neg);
            if (tr->dst.addr.type == PF_ADDR_TABLE)
                  pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
                      s->direction == dir) ? pd.dst : pd.src, pd.af,
                      pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
                      tr->dst.neg);
      }


      if (action == PF_SYNPROXY_DROP) {
            m_freem(*m0);
            *m0 = NULL;
            action = PF_PASS;
      } else if (r->rt)
            /* pf_route can free the mbuf causing *m0 to become NULL */
            pf_route(m0, r, dir, ifp, s);

#ifdef __FreeBSD__
      PF_UNLOCK();
#endif

      return (action);
}
#endif /* INET */

#ifdef INET6
int
#ifdef __FreeBSD__
pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
    struct ether_header *eh, struct inpcb *inp)
#else
pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
    struct ether_header *eh)
#endif
{
      struct pfi_kif          *kif;
      u_short                  action, reason = 0, log = 0;
      struct mbuf       *m = *m0;
      struct ip6_hdr          *h = NULL;  /* make the compiler happy */
      struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
      struct pf_state         *s = NULL;
      struct pf_ruleset *ruleset = NULL;
      struct pf_pdesc          pd;
      int                off, terminal = 0, dirndx;

#ifdef __FreeBSD__
      PF_LOCK();
#endif

      if (!pf_status.running ||
#ifdef __FreeBSD__
          (m->m_flags & M_SKIP_FIREWALL)) {
            PF_UNLOCK();
#else
          (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) {
#endif
            return (PF_PASS);
      }

#ifdef __FreeBSD__
      /* XXX_IMPORT: later */
#else
      if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
            ifp = ifp->if_carpdev;
#endif

      kif = pfi_index2kif[ifp->if_index];
      if (kif == NULL) {
#ifdef __FreeBSD__
            PF_UNLOCK();
#endif
            DPFPRINTF(PF_DEBUG_URGENT,
                ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
            return (PF_DROP);
      }
      if (kif->pfik_flags & PFI_IFLAG_SKIP) {
#ifdef __FreeBSD__
            PF_UNLOCK();
#endif
            return (PF_PASS);
      }

#ifdef __FreeBSD__
      M_ASSERTPKTHDR(m);
#else
#ifdef DIAGNOSTIC
      if ((m->m_flags & M_PKTHDR) == 0)
            panic("non-M_PKTHDR is passed to pf_test6");
#endif /* DIAGNOSTIC */
#endif

      memset(&pd, 0, sizeof(pd));
      if (m->m_pkthdr.len < (int)sizeof(*h)) {
            action = PF_DROP;
            REASON_SET(&reason, PFRES_SHORT);
            log = 1;
            goto done;
      }

      /* We do IP header normalization and packet reassembly here */
      if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
            action = PF_DROP;
            goto done;
      }
      m = *m0;
      h = mtod(m, struct ip6_hdr *);

      pd.src = (struct pf_addr *)&h->ip6_src;
      pd.dst = (struct pf_addr *)&h->ip6_dst;
      PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
      pd.ip_sum = NULL;
      pd.af = AF_INET6;
      pd.tos = 0;
      pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
      pd.eh = eh;

      off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
      pd.proto = h->ip6_nxt;
      do {
            switch (pd.proto) {
            case IPPROTO_FRAGMENT:
                  action = pf_test_fragment(&r, dir, kif, m, h,
                      &pd, &a, &ruleset);
                  if (action == PF_DROP)
                        REASON_SET(&reason, PFRES_FRAG);
                  goto done;
            case IPPROTO_AH:
            case IPPROTO_HOPOPTS:
            case IPPROTO_ROUTING:
            case IPPROTO_DSTOPTS: {
                  /* get next header and header length */
                  struct ip6_ext    opt6;

                  if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
                      NULL, &reason, pd.af)) {
                        DPFPRINTF(PF_DEBUG_MISC,
                            ("pf: IPv6 short opt\n"));
                        action = PF_DROP;
                        log = 1;
                        goto done;
                  }
                  if (pd.proto == IPPROTO_AH)
                        off += (opt6.ip6e_len + 2) * 4;
                  else
                        off += (opt6.ip6e_len + 1) * 8;
                  pd.proto = opt6.ip6e_nxt;
                  /* goto the next header */
                  break;
            }
            default:
                  terminal++;
                  break;
            }
      } while (!terminal);

      switch (pd.proto) {

      case IPPROTO_TCP: {
            struct tcphdr     th;

            pd.hdr.tcp = &th;
            if (!pf_pull_hdr(m, off, &th, sizeof(th),
                &action, &reason, AF_INET6)) {
                  log = action != PF_PASS;
                  goto done;
            }
            if (dir == PF_IN && pf_check_proto_cksum(m, off,
                ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)),
                IPPROTO_TCP, AF_INET6)) {
                  action = PF_DROP;
                  REASON_SET(&reason, PFRES_PROTCKSUM);
                  goto done;
            }
            pd.p_len = pd.tot_len - off - (th.th_off << 2);
            action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
            if (action == PF_DROP)
                  goto done;
            action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
                &reason);
            if (action == PF_PASS) {
#if NPFSYNC
                  pfsync_update_state(s);
#endif /* NPFSYNC */
                  r = s->rule.ptr;
                  a = s->anchor.ptr;
                  log = s->log;
            } else if (s == NULL)
#ifdef __FreeBSD__
                  action = pf_test_tcp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, NULL, inp);
#else
                  action = pf_test_tcp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, &ip6intrq);
#endif
            break;
      }

      case IPPROTO_UDP: {
            struct udphdr     uh;

            pd.hdr.udp = &uh;
            if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
                &action, &reason, AF_INET6)) {
                  log = action != PF_PASS;
                  goto done;
            }
            if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
                off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)),
                IPPROTO_UDP, AF_INET6)) {
                  action = PF_DROP;
                  REASON_SET(&reason, PFRES_PROTCKSUM);
                  goto done;
            }
            if (uh.uh_dport == 0 ||
                ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
                ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
                  action = PF_DROP;
                  goto done;
            }
            action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
            if (action == PF_PASS) {
#if NPFSYNC
                  pfsync_update_state(s);
#endif /* NPFSYNC */
                  r = s->rule.ptr;
                  a = s->anchor.ptr;
                  log = s->log;
            } else if (s == NULL)
#ifdef __FreeBSD__
                  action = pf_test_udp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, NULL, inp);
#else
                  action = pf_test_udp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, &ip6intrq);
#endif
            break;
      }

      case IPPROTO_ICMPV6: {
            struct icmp6_hdr  ih;

            pd.hdr.icmp6 = &ih;
            if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
                &action, &reason, AF_INET6)) {
                  log = action != PF_PASS;
                  goto done;
            }
            if (dir == PF_IN && pf_check_proto_cksum(m, off,
                ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)),
                IPPROTO_ICMPV6, AF_INET6)) {
                  action = PF_DROP;
                  REASON_SET(&reason, PFRES_PROTCKSUM);
                  goto done;
            }
            action = pf_test_state_icmp(&s, dir, kif,
                m, off, h, &pd, &reason);
            if (action == PF_PASS) {
#if NPFSYNC
                  pfsync_update_state(s);
#endif /* NPFSYNC */
                  r = s->rule.ptr;
                  a = s->anchor.ptr;
                  log = s->log;
            } else if (s == NULL)
#ifdef __FreeBSD__
                  action = pf_test_icmp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, NULL);
#else
                  action = pf_test_icmp(&r, &s, dir, kif,
                      m, off, h, &pd, &a, &ruleset, &ip6intrq);
#endif
            break;
      }

      default:
            action = pf_test_state_other(&s, dir, kif, &pd);
            if (action == PF_PASS) {
#if NPFSYNC
                  pfsync_update_state(s);
#endif /* NPFSYNC */
                  r = s->rule.ptr;
                  a = s->anchor.ptr;
                  log = s->log;
            } else if (s == NULL)
#ifdef __FreeBSD__
                  action = pf_test_other(&r, &s, dir, kif, m, off, h,
                      &pd, &a, &ruleset, NULL);
#else
                  action = pf_test_other(&r, &s, dir, kif, m, off, h,
                      &pd, &a, &ruleset, &ip6intrq);
#endif
            break;
      }

done:
      /* XXX handle IPv6 options, if not allowed. not implemented. */

      if (s && s->tag)
            pf_tag_packet(m, pf_get_tag(m), s->tag);

#ifdef ALTQ
      if (action == PF_PASS && r->qid) {
            struct m_tag      *mtag;
            struct altq_tag   *atag;

            mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
            if (mtag != NULL) {
                  atag = (struct altq_tag *)(mtag + 1);
                  if (pd.tos == IPTOS_LOWDELAY)
                        atag->qid = r->pqid;
                  else
                        atag->qid = r->qid;
                  /* add hints for ecn */
                  atag->af = AF_INET6;
                  atag->hdr = h;
                  m_tag_prepend(m, mtag);
            }
      }
#endif /* ALTQ */

      if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
          pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
          (s->nat_rule.ptr->action == PF_RDR ||
          s->nat_rule.ptr->action == PF_BINAT) &&
          IN6_IS_ADDR_LOOPBACK(&pd.dst->v6) &&
          pf_add_mbuf_tag(m, PACKET_TAG_PF_TRANSLATE_LOCALHOST)) {
            action = PF_DROP;
            REASON_SET(&reason, PFRES_MEMORY);
      }

      if (log)
            PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset);

      kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
      kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;

      if (action == PF_PASS || r->action == PF_DROP) {
            r->packets++;
            r->bytes += pd.tot_len;
            if (a != NULL) {
                  a->packets++;
                  a->bytes += pd.tot_len;
            }
            if (s != NULL) {
                  dirndx = (dir == s->direction) ? 0 : 1;
                  s->packets[dirndx]++;
                  s->bytes[dirndx] += pd.tot_len;
                  if (s->nat_rule.ptr != NULL) {
                        s->nat_rule.ptr->packets++;
                        s->nat_rule.ptr->bytes += pd.tot_len;
                  }
                  if (s->src_node != NULL) {
                        s->src_node->packets++;
                        s->src_node->bytes += pd.tot_len;
                  }
                  if (s->nat_src_node != NULL) {
                        s->nat_src_node->packets++;
                        s->nat_src_node->bytes += pd.tot_len;
                  }
            }
            tr = r;
            nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
            if (nr != NULL) {
                  struct pf_addr *x;
                  /*
                   * XXX: we need to make sure that the addresses
                   * passed to pfr_update_stats() are the same than
                   * the addresses used during matching (pfr_match)
                   */
                  if (r == &pf_default_rule) {
                        tr = nr;
                        x = (s == NULL || s->direction == dir) ?
                            &pd.baddr : &pd.naddr;
                  } else {
                        x = (s == NULL || s->direction == dir) ?
                            &pd.naddr : &pd.baddr;
                  }
                  if (x == &pd.baddr || s == NULL) {
                        if (dir == PF_OUT)
                              pd.src = x;
                        else
                              pd.dst = x;
                  }
            }
            if (tr->src.addr.type == PF_ADDR_TABLE)
                  pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
                      s->direction == dir) ? pd.src : pd.dst, pd.af,
                      pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
                      tr->src.neg);
            if (tr->dst.addr.type == PF_ADDR_TABLE)
                  pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
                      s->direction == dir) ? pd.dst : pd.src, pd.af,
                      pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
                      tr->dst.neg);
      }


      if (action == PF_SYNPROXY_DROP) {
            m_freem(*m0);
            *m0 = NULL;
            action = PF_PASS;
      } else if (r->rt)
            /* pf_route6 can free the mbuf causing *m0 to become NULL */
            pf_route6(m0, r, dir, ifp, s);

#ifdef __FreeBSD__
      PF_UNLOCK();
#endif
      return (action);
}
#endif /* INET6 */

int
pf_check_congestion(struct ifqueue *ifq)
{
#ifdef __FreeBSD__
      /* XXX_IMPORT: later */
      return (0);
#else
      if (ifq->ifq_congestion)
            return (1);
      else
            return (0);
#endif
}

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