text: /*	$NetBSD: pf.c,v 1.11 2004/12/21 12:06:37 peter Exp $	*/
  /*	$OpenBSD: pf.c,v 1.457.2.6 2004/12/19 18:48:57 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.
   *
   */
  
  #include "bpfilter.h"
  #include "pflog.h"
  #ifdef __OpenBSD__
  #include "pfsync.h"
  #else
  #define NPFSYNC	0
  #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>
  #include <sys/pool.h>
  #ifdef __NetBSD__
  #include <sys/endian.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>
  #ifdef __OpenBSD__
  #include <netinet/if_ether.h>
  #else
  #include <net/if_ether.h>
  #endif
  
  #ifdef __OpenBSD__
  #include <dev/rndvar.h>
  #else
  #include <sys/rnd.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 <netinet6/ip6_var.h>
  #ifdef __NetBSD__
  #include <netinet6/in6_pcb.h>
  #endif
  #include <netinet/icmp6.h>
  #include <netinet6/nd6.h>
  #endif /* INET6 */
  
  #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 __OpenBSD__
  struct timeout		 pf_expire_to;			/* expire timeout */
  #else
  struct callout		 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];
  
  struct pool		 pf_src_tree_pl, pf_rule_pl;
  struct pool		 pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
  
  void			 pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
  
  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);
  #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);
  void			 pf_send_tcp(const struct pf_rule *, sa_family_t,
  			    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 **,
  			    struct pf_ruleset **, struct ifqueue *);
  int			 pf_test_udp(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_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 *);
  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_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 *);
  int			 pf_socket_lookup(uid_t *, gid_t *,
  			    int, struct pf_pdesc *);
  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_check_congestion(struct ifqueue *);
  
  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 }
  };
  
  #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)					\
  			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)
  
  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 *);
  
  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);
  
  static __inline int
  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);
  }
  
  static __inline int
  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);
  }
  
  static __inline int
  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);
  }
  
  static __inline int
  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);
  }
  
  static __inline int
  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");
  	}
  }
  
  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);
  		if ((*sn) == NULL)
  			return (-1);
  		bzero(*sn, sizeof(struct pf_src_node));
  		(*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)
  			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 __OpenBSD__
  			printf("pf: state insert failed: "
  			    "id: %016llx creatorid: %08x",
  			    betoh64(state->id), ntohl(state->creatorid));
  #else
  			printf("pf: state insert failed: "
  			    "id: %016" PRIx64 " creatorid: %08x",
  			    be64toh(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 __OpenBSD__
  	struct timeout	*to = arg;
  #else
  	struct callout	*to = arg;
  #endif
  	int		 s;
  
  	s = splsoftnet();
  	pf_purge_expired_states();
  	pf_purge_expired_fragments();
  	pf_purge_expired_src_nodes();
  	splx(s);
  
  #ifdef __OpenBSD__
  	timeout_add(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz);
  #else
  	callout_schedule(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);
  	KASSERT(state->timeout < PFTM_MAX);
  	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->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)
  {
  	if (cur->src.state == PF_TCPS_PROXY_DST)
  		pf_send_tcp(cur->rule.ptr, cur->af,
  		    &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);
  	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 */
  
  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;
  
  		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
  pf_send_tcp(const struct pf_rule *r, sa_family_t af,
      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, tlen;
  #ifdef INET
  	struct ip	*h = NULL;
  #endif /* INET */
  #ifdef INET6
  	struct ip6_hdr	*h6 = NULL;
  #endif /* INET6 */
  	struct tcphdr	*th;
  	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 */
  	default:
  		return;
  	}
  
  	/* create outgoing mbuf */
  	m = m_gethdr(M_DONTWAIT, MT_HEADER);
  	if (m == NULL)
  		return;
  	if (tag) {
  		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);
  	}
  #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 */
  	default:
  		m_freem(m);
  		return;
  	}
  
  	/* 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;
  		h->ip_len = htons(len);
  		h->ip_off = htons(ip_mtudisc ? IP_DF : 0);
  		h->ip_ttl = ttl ? ttl : ip_defttl;
  		h->ip_sum = 0;
  		if (eh == NULL) {
  			ip_output(m, (void *)NULL, (void *)NULL, 0,
  			    (void *)NULL, (void *)NULL);
  		} else {
  #ifdef __OpenBSD__
  			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;
  			ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER,
  			    (void *)NULL, (void *)NULL);
  #else
  			/*
  			 * on netbsd, pf_test and pf_test6 are always called
  			 * with eh == NULL.
  			 */
  			panic("pf_send_tcp: eh != 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 __OpenBSD__
  		ip6_output(m, NULL, NULL, 0, NULL, NULL);
  #else
  		ip6_output(m, NULL, NULL, 0, NULL, 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)
  {
  	struct m_tag	*mtag;
  	struct mbuf	*m0;
  
  	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);
  
  #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:
  		icmp_error(m0, type, code, 0, (void *)NULL);
  		break;
  #endif /* INET */
  #ifdef INET6
  	case AF_INET6:
  		icmp6_error(m0, type, code, 0);
  		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_rule *nat_rule,
      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;
  		if (nat_rule != NULL && nat_rule->tag)
  			*tag = nat_rule->tag;
  	}
  
  	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);
  
  	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)) {
  			key.gwy.port = 0;
  			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;
  	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->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->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 (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(r->af, r, saddr, naddr, NULL, sn))
  				return (NULL);
  
  			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
  pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd)
  {
  	struct pf_addr		*saddr, *daddr;
  	u_int16_t		 sport, dport;
  	struct inpcbtable	*tb;
  	struct inpcb		*inp = NULL;
  #if defined(__NetBSD__) && defined(INET6)
  	struct in6pcb		*in6p = NULL;
  #endif
  
  	*uid = UID_MAX;
  	*gid = GID_MAX;
  	switch (pd->proto) {
  	case IPPROTO_TCP:
  		sport = pd->hdr.tcp->th_sport;
  		dport = pd->hdr.tcp->th_dport;
  		tb = &tcbtable;
  		break;
  	case IPPROTO_UDP:
  		sport = pd->hdr.udp->uh_sport;
  		dport = pd->hdr.udp->uh_dport;
  		tb = &udbtable;
  		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 __OpenBSD__
  		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);
  		}
  #else
  		inp = in_pcblookup_connect(tb, saddr->v4, sport, daddr->v4,
  		    dport);
  		if (inp == NULL) {
  			inp = in_pcblookup_bind(tb, daddr->v4, dport);
  			if (inp == NULL)
  				return (0);
  		}
  #endif
  		break;
  #endif /* INET */
  #ifdef INET6
  	case AF_INET6:
  #ifdef __OpenBSD__
  		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);
  		}
  #else
  		in6p = in6_pcblookup_connect(tb, &saddr->v6, sport, &daddr->v6,
  		    dport, 0);
  		if (in6p == NULL) {
  			in6p = in6_pcblookup_bind(tb, &daddr->v6, dport, 0);
  			if (inp == NULL)
  				return (0);
  		}
  #endif
  		break;
  #endif /* INET6 */
  
  	default:
  		return (0);
  	}
  #ifdef __OpenBSD__
  	*uid = inp->inp_socket->so_euid;
  	*gid = inp->inp_socket->so_egid;
  #else
  	switch (pd->af) {
  	case AF_INET:
  		*uid = inp->inp_socket->so_uid;
  		/* XXX gid */
  		break;
  #ifdef INET6
  	case AF_INET6:
  		*uid = in6p->in6p_socket->so_uid;
  		/* XXX gid */
  		break;
  #endif
  	}
  #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);
  			/* 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;
  	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 __OpenBSD__
  		rtalloc_noclone(&ro, NO_CLONING);
  #else
  		rtalloc(&ro);
  #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 __OpenBSD__
  		rtalloc_noclone((struct route *)&ro6, NO_CLONING);
  #else
  		rtalloc((struct route *)&ro6);
  #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,
      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 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))
  		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 =
  		    pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
  		    !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 =
  		    pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
  		    !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, nr, &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), 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++;
  			pf_send_tcp(r, af, pd->dst,
  			    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))
  			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)
  			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)))
  			goto cleanup;
  		s = pool_get(&pf_state_pl, PR_NOWAIT);
  		if (s == NULL) {
  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);
  			}
  			REASON_SET(&reason, PFRES_MEMORY);
  			return (PF_DROP);
  		}
  		bzero(s, sizeof(*s));
  		r->states++;
  		if (a != NULL)
  			a->states++;
  		s->rule.ptr = r;
  		s->nat_rule.ptr = nr;
  		if (s->nat_rule.ptr != NULL)
  			s->nat_rule.ptr->states++;
  		s->anchor.ptr = a;
  		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);
  			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);
  			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_MEMORY);
  			pf_src_tree_remove_state(s);
  			pool_put(&pf_state_pl, s);
  			return (PF_DROP);
  		} else
  			*sm = s;
  		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;
  			pf_send_tcp(r, af, daddr, saddr, th->th_dport,
  			    th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
  			    TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, NULL, NULL);
  			return (PF_SYNPROXY_DROP);
  		}
  	}
  
  	/* copy back packet headers if we performed NAT operations */
  	if (rewrite)
  		m_copyback(m, off, sizeof(*th), 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,
      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 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))
  		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 =
  		    pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
  		    !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 =
  		    pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
  		    !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, nr, &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), 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))
  			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)
  			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)))
  			goto cleanup;
  		s = pool_get(&pf_state_pl, PR_NOWAIT);
  		if (s == NULL) {
  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);
  			}
  			REASON_SET(&reason, PFRES_MEMORY);
  			return (PF_DROP);
  		}
  		bzero(s, sizeof(*s));
  		r->states++;
  		if (a != NULL)
  			a->states++;
  		s->rule.ptr = r;
  		s->nat_rule.ptr = nr;
  		if (s->nat_rule.ptr != NULL)
  			s->nat_rule.ptr->states++;
  		s->anchor.ptr = a;
  		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_MEMORY);
  			pf_src_tree_remove_state(s);
  			pool_put(&pf_state_pl, s);
  			return (PF_DROP);
  		} else
  			*sm = s;
  	}
  
  	/* copy back packet headers if we performed NAT operations */
  	if (rewrite)
  		m_copyback(m, off, sizeof(*uh), 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;
  	sa_family_t		 af = pd->af;
  	u_int8_t		 icmptype = 0, icmpcode = 0;
  	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))
  		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) {
  		/* 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_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 {
  		/* 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_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, nr, &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),
  			    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))
  			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)
  			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)))
  			goto cleanup;
  		s = pool_get(&pf_state_pl, PR_NOWAIT);
  		if (s == NULL) {
  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);
  			}
  			REASON_SET(&reason, PFRES_MEMORY);
  			return (PF_DROP);
  		}
  		bzero(s, sizeof(*s));
  		r->states++;
  		if (a != NULL)
  			a->states++;
  		s->rule.ptr = r;
  		s->nat_rule.ptr = nr;
  		if (s->nat_rule.ptr != NULL)
  			s->nat_rule.ptr->states++;
  		s->anchor.ptr = a;
  		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 = icmpid;
  			PF_ACPY(&s->ext.addr, daddr, af);
  			s->ext.port = icmpid;
  			if (nr != NULL)
  				PF_ACPY(&s->lan.addr, &pd->baddr, af);
  			else
  				PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
  			s->lan.port = icmpid;
  		} else {
  			PF_ACPY(&s->lan.addr, daddr, af);
  			s->lan.port = icmpid;
  			PF_ACPY(&s->ext.addr, saddr, af);
  			s->ext.port = icmpid;
  			if (nr != NULL)
  				PF_ACPY(&s->gwy.addr, &pd->baddr, af);
  			else
  				PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
  			s->gwy.port = icmpid;
  		}
  		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_MEMORY);
  			pf_src_tree_remove_state(s);
  			pool_put(&pf_state_pl, s);
  			return (PF_DROP);
  		} else
  			*sm = s;
  	}
  
  #ifdef INET6
  	/* copy back packet headers if we performed IPv6 NAT operations */
  	if (rewrite)
  		m_copyback(m, off, sizeof(struct icmp6_hdr),
  		    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))
  		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, nr, &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))
  			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)
  			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)))
  			goto cleanup;
  		s = pool_get(&pf_state_pl, PR_NOWAIT);
  		if (s == NULL) {
  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);
  			}
  			REASON_SET(&reason, PFRES_MEMORY);
  			return (PF_DROP);
  		}
  		bzero(s, sizeof(*s));
  		r->states++;
  		if (a != NULL)
  			a->states++;
  		s->rule.ptr = r;
  		s->nat_rule.ptr = nr;
  		if (s->nat_rule.ptr != NULL)
  			s->nat_rule.ptr->states++;
  		s->anchor.ptr = a;
  		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_MEMORY);
  			pf_src_tree_remove_state(s);
  			pool_put(&pf_state_pl, s);
  			return (PF_DROP);
  		} else
  			*sm = s;
  	}
  
  	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, NULL, &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)
  			return (PF_SYNPROXY_DROP);
  		if (th->th_flags & TH_SYN) {
  			if (ntohl(th->th_seq) != (*state)->src.seqlo)
  				return (PF_DROP);
  			pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
  			    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);
  			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))
  			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))
  				return (PF_DROP);
  			(*state)->src.max_win = MAX(ntohs(th->th_win), 1);
  			if ((*state)->dst.seqhi == 1)
  				(*state)->dst.seqhi = htonl(arc4random());
  			pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
  			    &dst->addr, src->port, dst->port,
  			    (*state)->dst.seqhi, 0, TH_SYN, 0,
  			    (*state)->src.mss, 0, 0, NULL, NULL);
  			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))
  			return (PF_DROP);
  		else {
  			(*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
  			(*state)->dst.seqlo = ntohl(th->th_seq);
  			pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
  			    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);
  			pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
  			    &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)->src.max_win;
  			(*state)->dst.seqhi = (*state)->dst.seqlo +
  			    (*state)->dst.max_win;
  			(*state)->src.wscale = (*state)->dst.wscale = 0;
  			(*state)->src.state = (*state)->dst.state =
  			    TCPS_ESTABLISHED;
  			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;
  
  #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;
  			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_FIN_WAIT_2 ||
  		    dst->state >= TCPS_FIN_WAIT_2)
  			(*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))
  				pf_send_tcp((*state)->rule.ptr, pd->af,
  				    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');
  		}
  		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), th);
  	} else if (copyback) {
  		/* Copyback sequence modulation or stateful scrub changes */
  		m_copyback(m, off, sizeof(*th), 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), 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)
  {
  	struct pf_addr	*saddr = pd->src, *daddr = pd->dst;
  	u_int16_t	 icmpid = 0, *icmpsum;
  	u_int8_t	 icmptype;
  	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 = icmpid;
  			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 = icmpid;
  		}
  
  		STATE_LOOKUP();
  
  		(*state)->expire = time_second;
  		(*state)->timeout = PFTM_ICMP_ERROR_REPLY;
  
  		/* translate source/destination address, if necessary */
  		if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) {
  			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);
  					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),
  					    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);
  					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),
  					    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;
  		int		off2 = 0;
  
  		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, NULL, 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))
  				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, NULL, 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
  					 */
  					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, NULL, 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, NULL, 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 &&
  			    !(th.th_flags & TH_SYN))
  				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);
  				}
  				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,
  					    pd->hdr.icmp);
  					m_copyback(m, ipoff2, sizeof(h2),
  					    &h2);
  					break;
  #endif /* INET */
  #ifdef INET6
  				case AF_INET6:
  					m_copyback(m, off,
  					    sizeof(struct icmp6_hdr),
  					    pd->hdr.icmp6);
  					m_copyback(m, ipoff2, sizeof(h2_6),
  					    &h2_6);
  					break;
  #endif /* INET6 */
  				}
  				m_copyback(m, off2, 8, &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, NULL, 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,
  					    pd->hdr.icmp);
  					m_copyback(m, ipoff2, sizeof(h2), &h2);
  					break;
  #endif /* INET */
  #ifdef INET6
  				case AF_INET6:
  					m_copyback(m, off,
  					    sizeof(struct icmp6_hdr),
  					    pd->hdr.icmp6);
  					m_copyback(m, ipoff2, sizeof(h2_6),
  					    &h2_6);
  					break;
  #endif /* INET6 */
  				}
  				m_copyback(m, off2, sizeof(uh), &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, NULL, 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 = iih.icmp_id;
  				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 = iih.icmp_id;
  			}
  
  			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, pd->hdr.icmp);
  				m_copyback(m, ipoff2, sizeof(h2), &h2);
  				m_copyback(m, off2, ICMP_MINLEN, &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, NULL, 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 = iih.icmp6_id;
  				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 = iih.icmp6_id;
  			}
  
  			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),
  				    pd->hdr.icmp6);
  				m_copyback(m, ipoff2, sizeof(h2_6), &h2_6);
  				m_copyback(m, off2, sizeof(struct icmp6_hdr),
  				    &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,
  					    pd->hdr.icmp);
  					m_copyback(m, ipoff2, sizeof(h2), &h2);
  					break;
  #endif /* INET */
  #ifdef INET6
  				case AF_INET6:
  					m_copyback(m, off,
  					    sizeof(struct icmp6_hdr),
  					    pd->hdr.icmp6);
  					m_copyback(m, ipoff2, sizeof(h2_6),
  					    &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;
  	struct route		 ro;
  	int			 ret = 0;
  
  	bzero(&ro, sizeof(ro));
  	dst = satosin(&ro.ro_dst);
  	dst->sin_family = af;
  	dst->sin_len = sizeof(*dst);
  	dst->sin_addr = addr->v4;
  #ifdef __OpenBSD__
  	rtalloc_noclone(&ro, NO_CLONING);
  #else
  	rtalloc(&ro);
  #endif
  
  	if (ro.ro_rt != NULL) {
  		ret = 1;
  		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;
  	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 __NetBSD__
  	struct tcphdr		 th;
  #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) {
  		if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
  			return;
  		if ((mtag = m_tag_copy(mtag)) == NULL)
  			goto bad;
  		m_tag_prepend(m0, mtag);
  	} else {
  		if ((r->rt == PF_REPLYTO) == (r->direction == dir))
  			return;
  		m0 = *m;
  	}
  
  	if (m0->m_len < sizeof(struct ip))
  		panic("pf_route: m0->m_len < sizeof(struct ip)");
  	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))
  			panic("pf_route: TAILQ_EMPTY(&r->rpool.list)");
  		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) {
  		if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS)
  			goto bad;
  		else if (m0 == NULL)
  			goto done;
  		if (m0->m_len < sizeof(struct ip))
  			panic("pf_route: m0->m_len < sizeof(struct ip)");
  		ip = mtod(m0, struct ip *);
  	}
  
  	/* 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. */
  #ifdef __OpenBSD__
  	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 */
  		}
  	}
  #else
  	m_copydata(m0, sizeof(*ip), sizeof(th), &th);
  	th.th_sum = 0;
  	m_copyback(m0, sizeof(*ip), sizeof(th), &th);
  	in4_cksum(m0, IPPROTO_TCP, sizeof(*ip), m0->m_pkthdr.len - sizeof(*ip));
  #endif
  
  	if (ntohs(ip->ip_len) <= ifp->if_mtu) {
  #ifdef __OpenBSD__
  		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);
  		}
  #else
  		ip->ip_sum = 0;
  		ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
  #endif
  #ifdef __OpenBSD__
  		/* 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++;
  #endif
  		error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL);
  		goto done;
  	}
  
  	/*
  	 * 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) {
  			icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
  			    ifp);
  			goto done;
  		} else
  			goto bad;
  	}
  
  	m1 = m0;
  	error = ip_fragment(m0, ifp, ifp->if_mtu);
  	if (error) {
  		m0 = NULL;
  		goto bad;
  	}
  
  	for (m0 = m1; m0; m0 = m1) {
  		m1 = m0->m_nextpkt;
  		m0->m_nextpkt = 0;
  		if (error == 0)
  			error = (*ifp->if_output)(ifp, m0, sintosa(dst),
  			    NULL);
  		else
  			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) {
  		if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
  			return;
  		if ((mtag = m_tag_copy(mtag)) == NULL)
  			goto bad;
  		m_tag_prepend(m0, mtag);
  	} else {
  		if ((r->rt == PF_REPLYTO) == (r->direction == dir))
  			return;
  		m0 = *m;
  	}
  
  	if (m0->m_len < sizeof(struct ip6_hdr))
  		panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
  	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) {
  		mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
  		if (mtag == NULL)
  			goto bad;
  		m_tag_prepend(m0, mtag);
  #ifdef __OpenBSD__
  		ip6_output(m0, NULL, NULL, 0, NULL, NULL);
  #else
  		ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
  #endif
  		return;
  	}
  
  	if (TAILQ_EMPTY(&r->rpool.list))
  		panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)");
  	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) {
  		if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS)
  			goto bad;
  		else if (m0 == NULL)
  			goto done;
  		if (m0->m_len < sizeof(struct ip6_hdr))
  			panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
  		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) {
  		error = nd6_output(ifp, ifp, m0, dst, NULL);
  	} else {
  		in6_ifstat_inc(ifp, ifs6_in_toobig);
  		if (r->rt != PF_DUPTO)
  			icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
  		else
  			goto bad;
  	}
  
  done:
  	if (r->rt != PF_DUPTO)
  		*m = NULL;
  	return;
  
  bad:
  	m_freem(m0);
  	goto done;
  }
  #endif /* INET6 */
  
  
  /*
   * 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)
  {
  #ifdef __OpenBSD__
  	u_int16_t flag_ok, flag_bad;
  #endif
  	u_int16_t sum;
  
  #ifdef __OpenBSD__
  	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);
  #endif
  	if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
  		return (1);
  	if (m->m_pkthdr.len < off + len)
  		return (1);
  #if 0 /*def __NetBSD__*/
  	switch (p) {
  	case IPPROTO_TCP: {
  			struct tcphdr th; /* XXX */
  			int thlen;
  
  			m_copydata(m, off, sizeof(th), &th); /* XXX */
  			thlen = th.th_off << 2;
  			return tcp_input_checksum(af, m, &th, off,
  			    thlen, len - thlen) != 0;
  		}
  
  	case IPPROTO_UDP: {
  			struct udphdr uh; /* XXX */
  
  			m_copydata(m, off, sizeof(uh), &uh); /* XXX */
  			return udp_input_checksum(af, m, &uh, off, len) != 0;
  		}
  		break;
  	}
  #endif /* __NetBSD__ */
  	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) {
  #ifdef __OpenBSD__
  		m->m_pkthdr.csum |= flag_bad;
  #endif
  		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);
  	}
  #ifdef __OpenBSD__
  	m->m_pkthdr.csum |= flag_ok;
  #endif
  	return (0);
  }
  
  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
  pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
      struct ether_header *eh)
  {
  	struct pfi_kif		*kif;
  	u_short			 action, reason = 0, log = 0;
  	struct mbuf		*m = *m0;
  	struct ip		*h = NULL;
  	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;
  
  	if (!pf_status.running ||
  	    (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL))
  		return (PF_PASS);
  
  	kif = pfi_index2kif[ifp->if_index];
  	if (kif == NULL)
  		return (PF_DROP);
  
  #ifdef DIAGNOSTIC
  	if ((m->m_flags & M_PKTHDR) == 0)
  		panic("non-M_PKTHDR is passed to pf_test");
  #endif /* DIAGNOSTIC */
  
  	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)
  			action = pf_test_tcp(&r, &s, dir, kif,
  			    m, off, h, &pd, &a, &ruleset, &ipintrq);
  		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)
  			action = pf_test_udp(&r, &s, dir, kif,
  			    m, off, h, &pd, &a, &ruleset, &ipintrq);
  		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);
  		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)
  			action = pf_test_icmp(&r, &s, dir, kif,
  			    m, off, h, &pd, &a, &ruleset, &ipintrq);
  		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)
  			action = pf_test_other(&r, &s, dir, kif, m, off, h,
  			    &pd, &a, &ruleset, &ipintrq);
  		break;
  	}
  
  done:
  	if (action == PF_PASS && h->ip_hl > 5 &&
  	    !((s && s->allow_opts) || r->allow_opts)) {
  		action = PF_DROP;
  		REASON_SET(&reason, PFRES_SHORT);
  		log = 1;
  		DPFPRINTF(PF_DEBUG_MISC,
  		    ("pf: dropping packet with ip options\n"));
  	}
  
  #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);
  
  	return (action);
  }
  #endif /* INET */
  
  #ifdef INET6
  int
  pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
      struct ether_header *eh)
  {
  	struct pfi_kif		*kif;
  	u_short			 action, reason = 0, log = 0;
  	struct mbuf		*m = *m0;
  	struct ip6_hdr		*h;
  	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;
  
  	if (!pf_status.running ||
  	    (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL))
  		return (PF_PASS);
  
  	kif = pfi_index2kif[ifp->if_index];
  	if (kif == NULL)
  		return (PF_DROP);
  
  #ifdef DIAGNOSTIC
  	if ((m->m_flags & M_PKTHDR) == 0)
  		panic("non-M_PKTHDR is passed to pf_test");
  #endif /* DIAGNOSTIC */
  
  	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, NULL, pd.af)) {
  				DPFPRINTF(PF_DEBUG_MISC,
  				    ("pf: IPv6 short opt\n"));
  				action = PF_DROP;
  				REASON_SET(&reason, PFRES_SHORT);
  				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;
  			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)
  			action = pf_test_tcp(&r, &s, dir, kif,
  			    m, off, h, &pd, &a, &ruleset, &ip6intrq);
  		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;
  			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)
  			action = pf_test_udp(&r, &s, dir, kif,
  			    m, off, h, &pd, &a, &ruleset, &ip6intrq);
  		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;
  			goto done;
  		}
  		action = pf_test_state_icmp(&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)
  			action = pf_test_icmp(&r, &s, dir, kif,
  			    m, off, h, &pd, &a, &ruleset, &ip6intrq);
  		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)
  			action = pf_test_other(&r, &s, dir, kif, m, off, h,
  			    &pd, &a, &ruleset, &ip6intrq);
  		break;
  	}
  
  done:
  	/* XXX handle IPv6 options, if not allowed. not implemented. */
  
  #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);
  
  	return (action);
  }
  #endif /* INET6 */
  
  int
  pf_check_congestion(struct ifqueue *ifq)
  {
  #ifdef __OpenBSD__
  	if (ifq->ifq_congestion)
  		return (1);
  	else
  		return (0);
  #else
  	return 0;
  #endif
  }
  