/*
 * Copyright (c) 2007-2020 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

/*	$apfw: pf_table.c,v 1.4 2008/08/27 00:01:32 jhw Exp $ */
/*	$OpenBSD: pf_table.c,v 1.68 2006/05/02 10:08:45 dhartmei Exp $	*/

/*
 * Copyright (c) 2002 Cedric Berger
 * 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.
 *
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>

#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <net/radix.h>
#include <net/pfvar.h>

#define ACCEPT_FLAGS(flags, oklist)             \
	do {                                    \
	        if ((flags & ~(oklist)) &       \
	            PFR_FLAG_ALLMASK)           \
	                return (EINVAL);        \
	} while (0)

#define COPYIN(from, to, size, flags)                           \
	((flags & PFR_FLAG_USERIOCTL) ?                         \
	copyin((from), (to), (size)) :                          \
	(bcopy((void *)(uintptr_t)(from), (to), (size)), 0))

#define COPYOUT(from, to, size, flags)                          \
	((flags & PFR_FLAG_USERIOCTL) ?                         \
	copyout((from), (to), (size)) :                         \
	(bcopy((from), (void *)(uintptr_t)(to), (size)), 0))

#define FILLIN_SIN(sin, addr)                   \
	do {                                    \
	        (sin).sin_len = sizeof (sin);   \
	        (sin).sin_family = AF_INET;     \
	        (sin).sin_addr = (addr);        \
	} while (0)

#define FILLIN_SIN6(sin6, addr)                         \
	do {                                            \
	        (sin6).sin6_len = sizeof (sin6);        \
	        (sin6).sin6_family = AF_INET6;          \
	        (sin6).sin6_addr = (addr);              \
	} while (0)

#define SWAP(type, a1, a2)                      \
	do {                                    \
	        type tmp = a1;                  \
	        a1 = a2;                        \
	        a2 = tmp;                       \
	} while (0)

#define SUNION2PF(su, af) (((af) == AF_INET) ?  \
	(struct pf_addr *)&(su)->sin.sin_addr : \
	(struct pf_addr *)&(su)->sin6.sin6_addr)

#define AF_BITS(af)             (((af) == AF_INET) ? 32 : 128)
#define ADDR_NETWORK(ad)        ((ad)->pfra_net < AF_BITS((ad)->pfra_af))
#define KENTRY_NETWORK(ke)      ((ke)->pfrke_net < AF_BITS((ke)->pfrke_af))
#define KENTRY_RNF_ROOT(ke) \
	        ((((struct radix_node *)(ke))->rn_flags & RNF_ROOT) != 0)

#define NO_ADDRESSES            (-1)
#define ENQUEUE_UNMARKED_ONLY   (1)
#define INVERT_NEG_FLAG         (1)

struct pfr_walktree {
	enum pfrw_op {
		PFRW_MARK,
		PFRW_SWEEP,
		PFRW_ENQUEUE,
		PFRW_GET_ADDRS,
		PFRW_GET_ASTATS,
		PFRW_POOL_GET,
		PFRW_DYNADDR_UPDATE
	}        pfrw_op;
	union {
		user_addr_t              pfrw1_addr;
		user_addr_t              pfrw1_astats;
		struct pfr_kentryworkq  *pfrw1_workq;
		struct pfr_kentry       *pfrw1_kentry;
		struct pfi_dynaddr      *pfrw1_dyn;
	}        pfrw_1;
	int      pfrw_free;
	int      pfrw_flags;
};
#define pfrw_addr       pfrw_1.pfrw1_addr
#define pfrw_astats     pfrw_1.pfrw1_astats
#define pfrw_workq      pfrw_1.pfrw1_workq
#define pfrw_kentry     pfrw_1.pfrw1_kentry
#define pfrw_dyn        pfrw_1.pfrw1_dyn
#define pfrw_cnt        pfrw_free

#define senderr(e)      do { rv = (e); goto _bad; } while (0)

struct pool              pfr_ktable_pl;
struct pool              pfr_kentry_pl;

static struct pool              pfr_kentry_pl2;
static struct sockaddr_in       pfr_sin;
static struct sockaddr_in6      pfr_sin6;
static union sockaddr_union     pfr_mask;
static struct pf_addr           pfr_ffaddr;

static void pfr_copyout_addr(struct pfr_addr *, struct pfr_kentry *ke);
static int pfr_validate_addr(struct pfr_addr *);
static void pfr_enqueue_addrs(struct pfr_ktable *, struct pfr_kentryworkq *,
    int *, int);
static void pfr_mark_addrs(struct pfr_ktable *);
static struct pfr_kentry *pfr_lookup_addr(struct pfr_ktable *,
    struct pfr_addr *, int);
static struct pfr_kentry *pfr_create_kentry(struct pfr_addr *, boolean_t);
static void pfr_destroy_kentries(struct pfr_kentryworkq *);
static void pfr_destroy_kentry(struct pfr_kentry *);
static void pfr_insert_kentries(struct pfr_ktable *,
    struct pfr_kentryworkq *, u_int64_t);
static void pfr_remove_kentries(struct pfr_ktable *, struct pfr_kentryworkq *);
static void pfr_clstats_kentries(struct pfr_kentryworkq *, u_int64_t, int);
static void pfr_reset_feedback(user_addr_t, int, int);
static void pfr_prepare_network(union sockaddr_union *, int, int);
static int pfr_route_kentry(struct pfr_ktable *, struct pfr_kentry *);
static int pfr_unroute_kentry(struct pfr_ktable *, struct pfr_kentry *);
static int pfr_walktree(struct radix_node *, void *);
static int pfr_validate_table(struct pfr_table *, int, int);
static int pfr_fix_anchor(char *);
static void pfr_commit_ktable(struct pfr_ktable *, u_int64_t);
static void pfr_insert_ktables(struct pfr_ktableworkq *);
static void pfr_insert_ktable(struct pfr_ktable *);
static void pfr_setflags_ktables(struct pfr_ktableworkq *);
static void pfr_setflags_ktable(struct pfr_ktable *, int);
static void pfr_clstats_ktables(struct pfr_ktableworkq *, u_int64_t, int);
static void pfr_clstats_ktable(struct pfr_ktable *, u_int64_t, int);
static struct pfr_ktable *pfr_create_ktable(struct pfr_table *, u_int64_t, int);
static void pfr_destroy_ktables(struct pfr_ktableworkq *, int);
static void pfr_destroy_ktable(struct pfr_ktable *, int);
static int pfr_ktable_compare(struct pfr_ktable *, struct pfr_ktable *);
static struct pfr_ktable *pfr_lookup_table(struct pfr_table *);
static void pfr_clean_node_mask(struct pfr_ktable *, struct pfr_kentryworkq *);
static int pfr_table_count(struct pfr_table *, int);
static int pfr_skip_table(struct pfr_table *, struct pfr_ktable *, int);
static struct pfr_kentry *pfr_kentry_byidx(struct pfr_ktable *, int, int);

RB_PROTOTYPE_SC(static, pfr_ktablehead, pfr_ktable, pfrkt_tree,
    pfr_ktable_compare);
RB_GENERATE(pfr_ktablehead, pfr_ktable, pfrkt_tree, pfr_ktable_compare);

static struct pfr_ktablehead    pfr_ktables;
static struct pfr_table         pfr_nulltable;
static int                      pfr_ktable_cnt;

void
pfr_initialize(void)
{
	pool_init(&pfr_ktable_pl, sizeof(struct pfr_ktable), 0, 0, 0,
	    "pfrktable", NULL);
	pool_init(&pfr_kentry_pl, sizeof(struct pfr_kentry), 0, 0, 0,
	    "pfrkentry", NULL);
	pool_init(&pfr_kentry_pl2, sizeof(struct pfr_kentry), 0, 0, 0,
	    "pfrkentry2", NULL);

	pfr_sin.sin_len = sizeof(pfr_sin);
	pfr_sin.sin_family = AF_INET;
	pfr_sin6.sin6_len = sizeof(pfr_sin6);
	pfr_sin6.sin6_family = AF_INET6;

	memset(&pfr_ffaddr, 0xff, sizeof(pfr_ffaddr));
}

#if 0
void
pfr_destroy(void)
{
	pool_destroy(&pfr_ktable_pl);
	pool_destroy(&pfr_kentry_pl);
	pool_destroy(&pfr_kentry_pl2);
}
#endif

int
pfr_clr_addrs(struct pfr_table *tbl, int *ndel, int flags)
{
	struct pfr_ktable       *kt;
	struct pfr_kentryworkq   workq;

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY);
	if (pfr_validate_table(tbl, 0, flags & PFR_FLAG_USERIOCTL)) {
		return EINVAL;
	}
	kt = pfr_lookup_table(tbl);
	if (kt == NULL || !(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return ESRCH;
	}
	if (kt->pfrkt_flags & PFR_TFLAG_CONST) {
		return EPERM;
	}
	pfr_enqueue_addrs(kt, &workq, ndel, 0);

	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_remove_kentries(kt, &workq);
		if (kt->pfrkt_cnt) {
			printf("pfr_clr_addrs: corruption detected (%d).\n",
			    kt->pfrkt_cnt);
			kt->pfrkt_cnt = 0;
		}
	}
	return 0;
}

int
pfr_add_addrs(struct pfr_table *tbl, user_addr_t _addr, int size,
    int *nadd, int flags)
{
	struct pfr_ktable       *kt, *tmpkt;
	struct pfr_kentryworkq   workq;
	struct pfr_kentry       *p, *q;
	struct pfr_addr          ad;
	int                      i, rv, xadd = 0;
	user_addr_t              addr = _addr;
	u_int64_t                tzero = pf_calendar_time_second();

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY |
	    PFR_FLAG_FEEDBACK);
	if (pfr_validate_table(tbl, 0, flags & PFR_FLAG_USERIOCTL)) {
		return EINVAL;
	}
	kt = pfr_lookup_table(tbl);
	if (kt == NULL || !(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return ESRCH;
	}
	if (kt->pfrkt_flags & PFR_TFLAG_CONST) {
		return EPERM;
	}
	tmpkt = pfr_create_ktable(&pfr_nulltable, 0, 0);
	if (tmpkt == NULL) {
		return ENOMEM;
	}
	SLIST_INIT(&workq);
	for (i = 0; i < size; i++, addr += sizeof(ad)) {
		if (COPYIN(addr, &ad, sizeof(ad), flags)) {
			senderr(EFAULT);
		}
		if (pfr_validate_addr(&ad)) {
			senderr(EINVAL);
		}
		p = pfr_lookup_addr(kt, &ad, 1);
		q = pfr_lookup_addr(tmpkt, &ad, 1);
		if (flags & PFR_FLAG_FEEDBACK) {
			if (q != NULL) {
				ad.pfra_fback = PFR_FB_DUPLICATE;
			} else if (p == NULL) {
				ad.pfra_fback = PFR_FB_ADDED;
			} else if (p->pfrke_not != ad.pfra_not) {
				ad.pfra_fback = PFR_FB_CONFLICT;
			} else {
				ad.pfra_fback = PFR_FB_NONE;
			}
		}
		if (p == NULL && q == NULL) {
			p = pfr_create_kentry(&ad,
			    !(flags & PFR_FLAG_USERIOCTL));
			if (p == NULL) {
				senderr(ENOMEM);
			}
			if (pfr_route_kentry(tmpkt, p)) {
				pfr_destroy_kentry(p);
				ad.pfra_fback = PFR_FB_NONE;
			} else {
				SLIST_INSERT_HEAD(&workq, p, pfrke_workq);
				xadd++;
			}
		}
		if (flags & PFR_FLAG_FEEDBACK) {
			if (COPYOUT(&ad, addr, sizeof(ad), flags)) {
				senderr(EFAULT);
			}
		}
	}
	pfr_clean_node_mask(tmpkt, &workq);
	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_insert_kentries(kt, &workq, tzero);
	} else {
		pfr_destroy_kentries(&workq);
	}
	if (nadd != NULL) {
		*nadd = xadd;
	}
	pfr_destroy_ktable(tmpkt, 0);
	return 0;
_bad:
	pfr_clean_node_mask(tmpkt, &workq);
	pfr_destroy_kentries(&workq);
	if (flags & PFR_FLAG_FEEDBACK) {
		pfr_reset_feedback(_addr, size, flags);
	}
	pfr_destroy_ktable(tmpkt, 0);
	return rv;
}

int
pfr_del_addrs(struct pfr_table *tbl, user_addr_t _addr, int size,
    int *ndel, int flags)
{
	struct pfr_ktable       *kt;
	struct pfr_kentryworkq   workq;
	struct pfr_kentry       *p;
	struct pfr_addr          ad;
	user_addr_t              addr = _addr;
	int                      i, rv, xdel = 0, log = 1;

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY |
	    PFR_FLAG_FEEDBACK);
	if (pfr_validate_table(tbl, 0, flags & PFR_FLAG_USERIOCTL)) {
		return EINVAL;
	}
	kt = pfr_lookup_table(tbl);
	if (kt == NULL || !(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return ESRCH;
	}
	if (kt->pfrkt_flags & PFR_TFLAG_CONST) {
		return EPERM;
	}
	/*
	 * there are two algorithms to choose from here.
	 * with:
	 *   n: number of addresses to delete
	 *   N: number of addresses in the table
	 *
	 * one is O(N) and is better for large 'n'
	 * one is O(n*LOG(N)) and is better for small 'n'
	 *
	 * following code try to decide which one is best.
	 */
	for (i = kt->pfrkt_cnt; i > 0; i >>= 1) {
		log++;
	}
	if (size > kt->pfrkt_cnt / log) {
		/* full table scan */
		pfr_mark_addrs(kt);
	} else {
		/* iterate over addresses to delete */
		for (i = 0; i < size; i++, addr += sizeof(ad)) {
			if (COPYIN(addr, &ad, sizeof(ad), flags)) {
				return EFAULT;
			}
			if (pfr_validate_addr(&ad)) {
				return EINVAL;
			}
			p = pfr_lookup_addr(kt, &ad, 1);
			if (p != NULL) {
				p->pfrke_mark = 0;
			}
		}
	}
	SLIST_INIT(&workq);
	for (addr = _addr, i = 0; i < size; i++, addr += sizeof(ad)) {
		if (COPYIN(addr, &ad, sizeof(ad), flags)) {
			senderr(EFAULT);
		}
		if (pfr_validate_addr(&ad)) {
			senderr(EINVAL);
		}
		p = pfr_lookup_addr(kt, &ad, 1);
		if (flags & PFR_FLAG_FEEDBACK) {
			if (p == NULL) {
				ad.pfra_fback = PFR_FB_NONE;
			} else if (p->pfrke_not != ad.pfra_not) {
				ad.pfra_fback = PFR_FB_CONFLICT;
			} else if (p->pfrke_mark) {
				ad.pfra_fback = PFR_FB_DUPLICATE;
			} else {
				ad.pfra_fback = PFR_FB_DELETED;
			}
		}
		if (p != NULL && p->pfrke_not == ad.pfra_not &&
		    !p->pfrke_mark) {
			p->pfrke_mark = 1;
			SLIST_INSERT_HEAD(&workq, p, pfrke_workq);
			xdel++;
		}
		if (flags & PFR_FLAG_FEEDBACK) {
			if (COPYOUT(&ad, addr, sizeof(ad), flags)) {
				senderr(EFAULT);
			}
		}
	}
	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_remove_kentries(kt, &workq);
	}
	if (ndel != NULL) {
		*ndel = xdel;
	}
	return 0;
_bad:
	if (flags & PFR_FLAG_FEEDBACK) {
		pfr_reset_feedback(_addr, size, flags);
	}
	return rv;
}

int
pfr_set_addrs(struct pfr_table *tbl, user_addr_t _addr, int size,
    int *size2, int *nadd, int *ndel, int *nchange, int flags,
    u_int32_t ignore_pfrt_flags)
{
	struct pfr_ktable       *kt, *tmpkt;
	struct pfr_kentryworkq   addq, delq, changeq;
	struct pfr_kentry       *p, *q;
	struct pfr_addr          ad;
	user_addr_t              addr = _addr;
	int                      i, rv, xadd = 0, xdel = 0, xchange = 0;
	u_int64_t                tzero = pf_calendar_time_second();

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY |
	    PFR_FLAG_FEEDBACK);
	if (pfr_validate_table(tbl, ignore_pfrt_flags, flags &
	    PFR_FLAG_USERIOCTL)) {
		return EINVAL;
	}
	kt = pfr_lookup_table(tbl);
	if (kt == NULL || !(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return ESRCH;
	}
	if (kt->pfrkt_flags & PFR_TFLAG_CONST) {
		return EPERM;
	}
	tmpkt = pfr_create_ktable(&pfr_nulltable, 0, 0);
	if (tmpkt == NULL) {
		return ENOMEM;
	}
	pfr_mark_addrs(kt);
	SLIST_INIT(&addq);
	SLIST_INIT(&delq);
	SLIST_INIT(&changeq);
	for (i = 0; i < size; i++, addr += sizeof(ad)) {
		if (COPYIN(addr, &ad, sizeof(ad), flags)) {
			senderr(EFAULT);
		}
		if (pfr_validate_addr(&ad)) {
			senderr(EINVAL);
		}
		ad.pfra_fback = PFR_FB_NONE;
		p = pfr_lookup_addr(kt, &ad, 1);
		if (p != NULL) {
			if (p->pfrke_mark) {
				ad.pfra_fback = PFR_FB_DUPLICATE;
				goto _skip;
			}
			p->pfrke_mark = 1;
			if (p->pfrke_not != ad.pfra_not) {
				SLIST_INSERT_HEAD(&changeq, p, pfrke_workq);
				ad.pfra_fback = PFR_FB_CHANGED;
				xchange++;
			}
		} else {
			q = pfr_lookup_addr(tmpkt, &ad, 1);
			if (q != NULL) {
				ad.pfra_fback = PFR_FB_DUPLICATE;
				goto _skip;
			}
			p = pfr_create_kentry(&ad,
			    !(flags & PFR_FLAG_USERIOCTL));
			if (p == NULL) {
				senderr(ENOMEM);
			}
			if (pfr_route_kentry(tmpkt, p)) {
				pfr_destroy_kentry(p);
				ad.pfra_fback = PFR_FB_NONE;
			} else {
				SLIST_INSERT_HEAD(&addq, p, pfrke_workq);
				ad.pfra_fback = PFR_FB_ADDED;
				xadd++;
			}
		}
_skip:
		if (flags & PFR_FLAG_FEEDBACK) {
			if (COPYOUT(&ad, addr, sizeof(ad), flags)) {
				senderr(EFAULT);
			}
		}
	}
	pfr_enqueue_addrs(kt, &delq, &xdel, ENQUEUE_UNMARKED_ONLY);
	if ((flags & PFR_FLAG_FEEDBACK) && *size2) {
		if (*size2 < size + xdel) {
			*size2 = size + xdel;
			senderr(0);
		}
		i = 0;
		addr = _addr + size;
		SLIST_FOREACH(p, &delq, pfrke_workq) {
			pfr_copyout_addr(&ad, p);
			ad.pfra_fback = PFR_FB_DELETED;
			if (COPYOUT(&ad, addr, sizeof(ad), flags)) {
				senderr(EFAULT);
			}
			addr += sizeof(ad);
			i++;
		}
	}
	pfr_clean_node_mask(tmpkt, &addq);
	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_insert_kentries(kt, &addq, tzero);
		pfr_remove_kentries(kt, &delq);
		pfr_clstats_kentries(&changeq, tzero, INVERT_NEG_FLAG);
	} else {
		pfr_destroy_kentries(&addq);
	}
	if (nadd != NULL) {
		*nadd = xadd;
	}
	if (ndel != NULL) {
		*ndel = xdel;
	}
	if (nchange != NULL) {
		*nchange = xchange;
	}
	if ((flags & PFR_FLAG_FEEDBACK) && size2) {
		*size2 = size + xdel;
	}
	pfr_destroy_ktable(tmpkt, 0);
	return 0;
_bad:
	pfr_clean_node_mask(tmpkt, &addq);
	pfr_destroy_kentries(&addq);
	if (flags & PFR_FLAG_FEEDBACK) {
		pfr_reset_feedback(_addr, size, flags);
	}
	pfr_destroy_ktable(tmpkt, 0);
	return rv;
}

int
pfr_tst_addrs(struct pfr_table *tbl, user_addr_t addr, int size,
    int *nmatch, int flags)
{
	struct pfr_ktable       *kt;
	struct pfr_kentry       *p;
	struct pfr_addr          ad;
	int                      i, xmatch = 0;

	ACCEPT_FLAGS(flags, PFR_FLAG_REPLACE);
	if (pfr_validate_table(tbl, 0, 0)) {
		return EINVAL;
	}
	kt = pfr_lookup_table(tbl);
	if (kt == NULL || !(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return ESRCH;
	}

	for (i = 0; i < size; i++, addr += sizeof(ad)) {
		if (COPYIN(addr, &ad, sizeof(ad), flags)) {
			return EFAULT;
		}
		if (pfr_validate_addr(&ad)) {
			return EINVAL;
		}
		if (ADDR_NETWORK(&ad)) {
			return EINVAL;
		}
		p = pfr_lookup_addr(kt, &ad, 0);
		if (flags & PFR_FLAG_REPLACE) {
			pfr_copyout_addr(&ad, p);
		}
		ad.pfra_fback = (p == NULL) ? PFR_FB_NONE :
		    (p->pfrke_not ? PFR_FB_NOTMATCH : PFR_FB_MATCH);
		if (p != NULL && !p->pfrke_not) {
			xmatch++;
		}
		if (COPYOUT(&ad, addr, sizeof(ad), flags)) {
			return EFAULT;
		}
	}
	if (nmatch != NULL) {
		*nmatch = xmatch;
	}
	return 0;
}

int
pfr_get_addrs(struct pfr_table *tbl, user_addr_t addr, int *size,
    int flags)
{
	struct pfr_ktable       *kt;
	struct pfr_walktree      w;
	int                      rv;

	ACCEPT_FLAGS(flags, 0);
	if (pfr_validate_table(tbl, 0, 0)) {
		return EINVAL;
	}
	kt = pfr_lookup_table(tbl);
	if (kt == NULL || !(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return ESRCH;
	}
	if (kt->pfrkt_cnt > *size) {
		*size = kt->pfrkt_cnt;
		return 0;
	}

	bzero(&w, sizeof(w));
	w.pfrw_op = PFRW_GET_ADDRS;
	w.pfrw_addr = addr;
	w.pfrw_free = kt->pfrkt_cnt;
	w.pfrw_flags = flags;
	rv = kt->pfrkt_ip4->rnh_walktree(kt->pfrkt_ip4, pfr_walktree, &w);
	if (!rv) {
		rv = kt->pfrkt_ip6->rnh_walktree(kt->pfrkt_ip6,
		    pfr_walktree, &w);
	}
	if (rv) {
		return rv;
	}

	if (w.pfrw_free) {
		printf("pfr_get_addrs: corruption detected (%d).\n",
		    w.pfrw_free);
		return ENOTTY;
	}
	*size = kt->pfrkt_cnt;
	return 0;
}

int
pfr_get_astats(struct pfr_table *tbl, user_addr_t addr, int *size,
    int flags)
{
	struct pfr_ktable       *kt;
	struct pfr_walktree      w;
	struct pfr_kentryworkq   workq;
	int                      rv;
	u_int64_t                tzero = pf_calendar_time_second();

	/* XXX PFR_FLAG_CLSTATS disabled */
	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC);
	if (pfr_validate_table(tbl, 0, 0)) {
		return EINVAL;
	}
	kt = pfr_lookup_table(tbl);
	if (kt == NULL || !(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return ESRCH;
	}
	if (kt->pfrkt_cnt > *size) {
		*size = kt->pfrkt_cnt;
		return 0;
	}

	bzero(&w, sizeof(w));
	w.pfrw_op = PFRW_GET_ASTATS;
	w.pfrw_astats = addr;
	w.pfrw_free = kt->pfrkt_cnt;
	w.pfrw_flags = flags;
	rv = kt->pfrkt_ip4->rnh_walktree(kt->pfrkt_ip4, pfr_walktree, &w);
	if (!rv) {
		rv = kt->pfrkt_ip6->rnh_walktree(kt->pfrkt_ip6,
		    pfr_walktree, &w);
	}
	if (!rv && (flags & PFR_FLAG_CLSTATS)) {
		pfr_enqueue_addrs(kt, &workq, NULL, 0);
		pfr_clstats_kentries(&workq, tzero, 0);
	}
	if (rv) {
		return rv;
	}

	if (w.pfrw_free) {
		printf("pfr_get_astats: corruption detected (%d).\n",
		    w.pfrw_free);
		return ENOTTY;
	}
	*size = kt->pfrkt_cnt;
	return 0;
}

int
pfr_clr_astats(struct pfr_table *tbl, user_addr_t _addr, int size,
    int *nzero, int flags)
{
	struct pfr_ktable       *kt;
	struct pfr_kentryworkq   workq;
	struct pfr_kentry       *p;
	struct pfr_addr          ad;
	user_addr_t              addr = _addr;
	int                      i, rv, xzero = 0;

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY |
	    PFR_FLAG_FEEDBACK);
	if (pfr_validate_table(tbl, 0, 0)) {
		return EINVAL;
	}
	kt = pfr_lookup_table(tbl);
	if (kt == NULL || !(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return ESRCH;
	}
	SLIST_INIT(&workq);
	for (i = 0; i < size; i++, addr += sizeof(ad)) {
		if (COPYIN(addr, &ad, sizeof(ad), flags)) {
			senderr(EFAULT);
		}
		if (pfr_validate_addr(&ad)) {
			senderr(EINVAL);
		}
		p = pfr_lookup_addr(kt, &ad, 1);
		if (flags & PFR_FLAG_FEEDBACK) {
			ad.pfra_fback = (p != NULL) ?
			    PFR_FB_CLEARED : PFR_FB_NONE;
			if (COPYOUT(&ad, addr, sizeof(ad), flags)) {
				senderr(EFAULT);
			}
		}
		if (p != NULL) {
			SLIST_INSERT_HEAD(&workq, p, pfrke_workq);
			xzero++;
		}
	}

	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_clstats_kentries(&workq, 0, 0);
	}
	if (nzero != NULL) {
		*nzero = xzero;
	}
	return 0;
_bad:
	if (flags & PFR_FLAG_FEEDBACK) {
		pfr_reset_feedback(_addr, size, flags);
	}
	return rv;
}

static int
pfr_validate_addr(struct pfr_addr *ad)
{
	int i;

	switch (ad->pfra_af) {
#if INET
	case AF_INET:
		if (ad->pfra_net > 32) {
			return -1;
		}
		break;
#endif /* INET */
	case AF_INET6:
		if (ad->pfra_net > 128) {
			return -1;
		}
		break;
	default:
		return -1;
	}
	if (ad->pfra_net < 128 &&
	    (((caddr_t)ad)[ad->pfra_net / 8] & (0xFF >> (ad->pfra_net % 8)))) {
		return -1;
	}
	for (i = (ad->pfra_net + 7) / 8; i < (int)sizeof(ad->pfra_u); i++) {
		if (((caddr_t)ad)[i]) {
			return -1;
		}
	}
	if (ad->pfra_not && ad->pfra_not != 1) {
		return -1;
	}
	if (ad->pfra_fback) {
		return -1;
	}
	return 0;
}

static void
pfr_enqueue_addrs(struct pfr_ktable *kt, struct pfr_kentryworkq *workq,
    int *naddr, int sweep)
{
	struct pfr_walktree     w;

	SLIST_INIT(workq);
	bzero(&w, sizeof(w));
	w.pfrw_op = sweep ? PFRW_SWEEP : PFRW_ENQUEUE;
	w.pfrw_workq = workq;
	if (kt->pfrkt_ip4 != NULL) {
		if (kt->pfrkt_ip4->rnh_walktree(kt->pfrkt_ip4,
		    pfr_walktree, &w)) {
			printf("pfr_enqueue_addrs: IPv4 walktree failed.\n");
		}
	}
	if (kt->pfrkt_ip6 != NULL) {
		if (kt->pfrkt_ip6->rnh_walktree(kt->pfrkt_ip6,
		    pfr_walktree, &w)) {
			printf("pfr_enqueue_addrs: IPv6 walktree failed.\n");
		}
	}
	if (naddr != NULL) {
		*naddr = w.pfrw_cnt;
	}
}

static void
pfr_mark_addrs(struct pfr_ktable *kt)
{
	struct pfr_walktree     w;

	bzero(&w, sizeof(w));
	w.pfrw_op = PFRW_MARK;
	if (kt->pfrkt_ip4->rnh_walktree(kt->pfrkt_ip4, pfr_walktree, &w)) {
		printf("pfr_mark_addrs: IPv4 walktree failed.\n");
	}
	if (kt->pfrkt_ip6->rnh_walktree(kt->pfrkt_ip6, pfr_walktree, &w)) {
		printf("pfr_mark_addrs: IPv6 walktree failed.\n");
	}
}


static struct pfr_kentry *
pfr_lookup_addr(struct pfr_ktable *kt, struct pfr_addr *ad, int exact)
{
	union sockaddr_union     sa, mask;
	struct radix_node_head  *head;
	struct pfr_kentry       *ke;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	bzero(&sa, sizeof(sa));
	if (ad->pfra_af == AF_INET) {
		FILLIN_SIN(sa.sin, ad->pfra_ip4addr);
		head = kt->pfrkt_ip4;
	} else if (ad->pfra_af == AF_INET6) {
		FILLIN_SIN6(sa.sin6, ad->pfra_ip6addr);
		head = kt->pfrkt_ip6;
	} else {
		return NULL;
	}
	if (ADDR_NETWORK(ad)) {
		pfr_prepare_network(&mask, ad->pfra_af, ad->pfra_net);
		ke = (struct pfr_kentry *)rn_lookup(&sa, &mask, head);
		if (ke && KENTRY_RNF_ROOT(ke)) {
			ke = NULL;
		}
	} else {
		ke = (struct pfr_kentry *)rn_match(&sa, head);
		if (ke && KENTRY_RNF_ROOT(ke)) {
			ke = NULL;
		}
		if (exact && ke && KENTRY_NETWORK(ke)) {
			ke = NULL;
		}
	}
	return ke;
}

static struct pfr_kentry *
pfr_create_kentry(struct pfr_addr *ad, boolean_t intr)
{
	struct pfr_kentry       *ke;

	if (intr) {
		ke = pool_get(&pfr_kentry_pl2, PR_WAITOK);
	} else {
		ke = pool_get(&pfr_kentry_pl, PR_WAITOK);
	}
	if (ke == NULL) {
		return NULL;
	}
	bzero(ke, sizeof(*ke));

	if (ad->pfra_af == AF_INET) {
		FILLIN_SIN(ke->pfrke_sa.sin, ad->pfra_ip4addr);
	} else if (ad->pfra_af == AF_INET6) {
		FILLIN_SIN6(ke->pfrke_sa.sin6, ad->pfra_ip6addr);
	}
	ke->pfrke_af = ad->pfra_af;
	ke->pfrke_net = ad->pfra_net;
	ke->pfrke_not = ad->pfra_not;
	ke->pfrke_intrpool = (u_int8_t)intr;
	return ke;
}

static void
pfr_destroy_kentries(struct pfr_kentryworkq *workq)
{
	struct pfr_kentry       *p, *q;

	for (p = SLIST_FIRST(workq); p != NULL; p = q) {
		q = SLIST_NEXT(p, pfrke_workq);
		pfr_destroy_kentry(p);
	}
}

static void
pfr_destroy_kentry(struct pfr_kentry *ke)
{
	if (ke->pfrke_intrpool) {
		pool_put(&pfr_kentry_pl2, ke);
	} else {
		pool_put(&pfr_kentry_pl, ke);
	}
}

static void
pfr_insert_kentries(struct pfr_ktable *kt,
    struct pfr_kentryworkq *workq, u_int64_t tzero)
{
	struct pfr_kentry       *p;
	int                      rv, n = 0;

	SLIST_FOREACH(p, workq, pfrke_workq) {
		rv = pfr_route_kentry(kt, p);
		if (rv) {
			printf("pfr_insert_kentries: cannot route entry "
			    "(code=%d).\n", rv);
			break;
		}
		p->pfrke_tzero = tzero;
		n++;
	}
	kt->pfrkt_cnt += n;
}

int
pfr_insert_kentry(struct pfr_ktable *kt, struct pfr_addr *ad, u_int64_t tzero)
{
	struct pfr_kentry       *p;
	int                      rv;

	p = pfr_lookup_addr(kt, ad, 1);
	if (p != NULL) {
		return 0;
	}
	p = pfr_create_kentry(ad, TRUE);
	if (p == NULL) {
		return EINVAL;
	}

	rv = pfr_route_kentry(kt, p);
	if (rv) {
		return rv;
	}

	p->pfrke_tzero = tzero;
	kt->pfrkt_cnt++;

	return 0;
}

static void
pfr_remove_kentries(struct pfr_ktable *kt,
    struct pfr_kentryworkq *workq)
{
	struct pfr_kentry       *p;
	int                      n = 0;

	SLIST_FOREACH(p, workq, pfrke_workq) {
		pfr_unroute_kentry(kt, p);
		n++;
	}
	kt->pfrkt_cnt -= n;
	pfr_destroy_kentries(workq);
}

static void
pfr_clean_node_mask(struct pfr_ktable *kt,
    struct pfr_kentryworkq *workq)
{
	struct pfr_kentry       *p;

	SLIST_FOREACH(p, workq, pfrke_workq)
	pfr_unroute_kentry(kt, p);
}

static void
pfr_clstats_kentries(struct pfr_kentryworkq *workq, u_int64_t tzero,
    int negchange)
{
	struct pfr_kentry       *p;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	SLIST_FOREACH(p, workq, pfrke_workq) {
		if (negchange) {
			p->pfrke_not = !p->pfrke_not;
		}
		bzero(p->pfrke_packets, sizeof(p->pfrke_packets));
		bzero(p->pfrke_bytes, sizeof(p->pfrke_bytes));
		p->pfrke_tzero = tzero;
	}
}

static void
pfr_reset_feedback(user_addr_t addr, int size, int flags)
{
	struct pfr_addr ad;
	int             i;

	for (i = 0; i < size; i++, addr += sizeof(ad)) {
		if (COPYIN(addr, &ad, sizeof(ad), flags)) {
			break;
		}
		ad.pfra_fback = PFR_FB_NONE;
		if (COPYOUT(&ad, addr, sizeof(ad), flags)) {
			break;
		}
	}
}

static void
pfr_prepare_network(union sockaddr_union *sa, int af, int net)
{
	int     i;

	bzero(sa, sizeof(*sa));
	if (af == AF_INET) {
		sa->sin.sin_len = sizeof(sa->sin);
		sa->sin.sin_family = AF_INET;
		sa->sin.sin_addr.s_addr = net ? htonl(-1 << (32 - net)) : 0;
	} else if (af == AF_INET6) {
		sa->sin6.sin6_len = sizeof(sa->sin6);
		sa->sin6.sin6_family = AF_INET6;
		for (i = 0; i < 4; i++) {
			if (net <= 32) {
				sa->sin6.sin6_addr.s6_addr32[i] =
				    net ? htonl(-1 << (32 - net)) : 0;
				break;
			}
			sa->sin6.sin6_addr.s6_addr32[i] = 0xFFFFFFFF;
			net -= 32;
		}
	}
}

static int
pfr_route_kentry(struct pfr_ktable *kt, struct pfr_kentry *ke)
{
	union sockaddr_union     mask;
	struct radix_node       *rn;
	struct radix_node_head  *head;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	bzero(ke->pfrke_node, sizeof(ke->pfrke_node));
	if (ke->pfrke_af == AF_INET) {
		head = kt->pfrkt_ip4;
	} else if (ke->pfrke_af == AF_INET6) {
		head = kt->pfrkt_ip6;
	} else {
		return -1;
	}

	if (KENTRY_NETWORK(ke)) {
		pfr_prepare_network(&mask, ke->pfrke_af, ke->pfrke_net);
		rn = rn_addroute(&ke->pfrke_sa, &mask, head, ke->pfrke_node);
	} else {
		rn = rn_addroute(&ke->pfrke_sa, NULL, head, ke->pfrke_node);
	}

	return rn == NULL ? -1 : 0;
}

static int
pfr_unroute_kentry(struct pfr_ktable *kt, struct pfr_kentry *ke)
{
	union sockaddr_union     mask;
	struct radix_node       *rn;
	struct radix_node_head  *head;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	if (ke->pfrke_af == AF_INET) {
		head = kt->pfrkt_ip4;
	} else if (ke->pfrke_af == AF_INET6) {
		head = kt->pfrkt_ip6;
	} else {
		return -1;
	}

	if (KENTRY_NETWORK(ke)) {
		pfr_prepare_network(&mask, ke->pfrke_af, ke->pfrke_net);
		rn = rn_delete(&ke->pfrke_sa, &mask, head);
	} else {
		rn = rn_delete(&ke->pfrke_sa, NULL, head);
	}

	if (rn == NULL) {
		printf("pfr_unroute_kentry: delete failed.\n");
		return -1;
	}
	return 0;
}

static void
pfr_copyout_addr(struct pfr_addr *ad, struct pfr_kentry *ke)
{
	bzero(ad, sizeof(*ad));
	if (ke == NULL) {
		return;
	}
	ad->pfra_af = ke->pfrke_af;
	ad->pfra_net = ke->pfrke_net;
	ad->pfra_not = ke->pfrke_not;
	if (ad->pfra_af == AF_INET) {
		ad->pfra_ip4addr = ke->pfrke_sa.sin.sin_addr;
	} else if (ad->pfra_af == AF_INET6) {
		ad->pfra_ip6addr = ke->pfrke_sa.sin6.sin6_addr;
	}
}

static int
pfr_walktree(struct radix_node *rn, void *arg)
{
	struct pfr_kentry       *ke = (struct pfr_kentry *)rn;
	struct pfr_walktree     *w = arg;
	int                      flags = w->pfrw_flags;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	switch (w->pfrw_op) {
	case PFRW_MARK:
		ke->pfrke_mark = 0;
		break;
	case PFRW_SWEEP:
		if (ke->pfrke_mark) {
			break;
		}
		OS_FALLTHROUGH;
	case PFRW_ENQUEUE:
		SLIST_INSERT_HEAD(w->pfrw_workq, ke, pfrke_workq);
		w->pfrw_cnt++;
		break;
	case PFRW_GET_ADDRS:
		if (w->pfrw_free-- > 0) {
			struct pfr_addr ad;

			pfr_copyout_addr(&ad, ke);
			if (copyout(&ad, w->pfrw_addr, sizeof(ad))) {
				return EFAULT;
			}
			w->pfrw_addr += sizeof(ad);
		}
		break;
	case PFRW_GET_ASTATS:
		if (w->pfrw_free-- > 0) {
			struct pfr_astats as;

			bzero(&as, sizeof(as));

			pfr_copyout_addr(&as.pfras_a, ke);

			bcopy(ke->pfrke_packets, as.pfras_packets,
			    sizeof(as.pfras_packets));
			bcopy(ke->pfrke_bytes, as.pfras_bytes,
			    sizeof(as.pfras_bytes));
			as.pfras_tzero = ke->pfrke_tzero;

			if (COPYOUT(&as, w->pfrw_astats, sizeof(as), flags)) {
				return EFAULT;
			}
			w->pfrw_astats += sizeof(as);
		}
		break;
	case PFRW_POOL_GET:
		if (ke->pfrke_not) {
			break; /* negative entries are ignored */
		}
		if (!w->pfrw_cnt--) {
			w->pfrw_kentry = ke;
			return 1; /* finish search */
		}
		break;
	case PFRW_DYNADDR_UPDATE:
		if (ke->pfrke_af == AF_INET) {
			if (w->pfrw_dyn->pfid_acnt4++ > 0) {
				break;
			}
			pfr_prepare_network(&pfr_mask, AF_INET, ke->pfrke_net);
			w->pfrw_dyn->pfid_addr4 = *SUNION2PF(
				&ke->pfrke_sa, AF_INET);
			w->pfrw_dyn->pfid_mask4 = *SUNION2PF(
				&pfr_mask, AF_INET);
		} else if (ke->pfrke_af == AF_INET6) {
			if (w->pfrw_dyn->pfid_acnt6++ > 0) {
				break;
			}
			pfr_prepare_network(&pfr_mask, AF_INET6, ke->pfrke_net);
			w->pfrw_dyn->pfid_addr6 = *SUNION2PF(
				&ke->pfrke_sa, AF_INET6);
			w->pfrw_dyn->pfid_mask6 = *SUNION2PF(
				&pfr_mask, AF_INET6);
		}
		break;
	}
	return 0;
}

int
pfr_clr_tables(struct pfr_table *filter, int *ndel, int flags)
{
	struct pfr_ktableworkq   workq;
	struct pfr_ktable       *p;
	int                      xdel = 0;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY |
	    PFR_FLAG_ALLRSETS);
	if (pfr_fix_anchor(filter->pfrt_anchor)) {
		return EINVAL;
	}
	if (pfr_table_count(filter, flags) < 0) {
		return ENOENT;
	}

	SLIST_INIT(&workq);
	RB_FOREACH(p, pfr_ktablehead, &pfr_ktables) {
		if (pfr_skip_table(filter, p, flags)) {
			continue;
		}
		if (strcmp(p->pfrkt_anchor, PF_RESERVED_ANCHOR) == 0) {
			continue;
		}
		if (!(p->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
			continue;
		}
		p->pfrkt_nflags = p->pfrkt_flags & ~PFR_TFLAG_ACTIVE;
		SLIST_INSERT_HEAD(&workq, p, pfrkt_workq);
		xdel++;
	}
	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_setflags_ktables(&workq);
	}
	if (ndel != NULL) {
		*ndel = xdel;
	}
	return 0;
}

int
pfr_add_tables(user_addr_t tbl, int size, int *nadd, int flags)
{
	struct pfr_ktableworkq   addq, changeq;
	struct pfr_ktable       *p, *q, *r, key;
	int                      i, rv, xadd = 0;
	u_int64_t                tzero = pf_calendar_time_second();

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY);
	SLIST_INIT(&addq);
	SLIST_INIT(&changeq);
	for (i = 0; i < size; i++, tbl += sizeof(key.pfrkt_t)) {
		if (COPYIN(tbl, &key.pfrkt_t, sizeof(key.pfrkt_t), flags)) {
			senderr(EFAULT);
		}
		pfr_table_copyin_cleanup(&key.pfrkt_t);
		if (pfr_validate_table(&key.pfrkt_t, PFR_TFLAG_USRMASK,
		    flags & PFR_FLAG_USERIOCTL)) {
			senderr(EINVAL);
		}
		key.pfrkt_flags |= PFR_TFLAG_ACTIVE;
		p = RB_FIND(pfr_ktablehead, &pfr_ktables, &key);
		if (p == NULL) {
			p = pfr_create_ktable(&key.pfrkt_t, tzero, 1);
			if (p == NULL) {
				senderr(ENOMEM);
			}
			SLIST_FOREACH(q, &addq, pfrkt_workq) {
				if (!pfr_ktable_compare(p, q)) {
					pfr_destroy_ktable(p, 0);
					goto _skip;
				}
			}
			SLIST_INSERT_HEAD(&addq, p, pfrkt_workq);
			xadd++;
			if (!key.pfrkt_anchor[0]) {
				goto _skip;
			}

			/* find or create root table */
			bzero(key.pfrkt_anchor, sizeof(key.pfrkt_anchor));
			r = RB_FIND(pfr_ktablehead, &pfr_ktables, &key);
			if (r != NULL) {
				p->pfrkt_root = r;
				goto _skip;
			}
			SLIST_FOREACH(q, &addq, pfrkt_workq) {
				if (!pfr_ktable_compare(&key, q)) {
					p->pfrkt_root = q;
					goto _skip;
				}
			}
			key.pfrkt_flags = 0;
			r = pfr_create_ktable(&key.pfrkt_t, 0, 1);
			if (r == NULL) {
				senderr(ENOMEM);
			}
			SLIST_INSERT_HEAD(&addq, r, pfrkt_workq);
			p->pfrkt_root = r;
		} else if (!(p->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
			SLIST_FOREACH(q, &changeq, pfrkt_workq)
			if (!pfr_ktable_compare(&key, q)) {
				goto _skip;
			}
			p->pfrkt_nflags = (p->pfrkt_flags &
			    ~PFR_TFLAG_USRMASK) | key.pfrkt_flags;
			SLIST_INSERT_HEAD(&changeq, p, pfrkt_workq);
			xadd++;
		}
_skip:
		;
	}
	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_insert_ktables(&addq);
		pfr_setflags_ktables(&changeq);
	} else {
		pfr_destroy_ktables(&addq, 0);
	}
	if (nadd != NULL) {
		*nadd = xadd;
	}
	return 0;
_bad:
	pfr_destroy_ktables(&addq, 0);
	return rv;
}

int
pfr_del_tables(user_addr_t tbl, int size, int *ndel, int flags)
{
	struct pfr_ktableworkq   workq;
	struct pfr_ktable       *p, *q, key;
	int                      i, xdel = 0;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY);
	SLIST_INIT(&workq);
	for (i = 0; i < size; i++, tbl += sizeof(key.pfrkt_t)) {
		if (COPYIN(tbl, &key.pfrkt_t, sizeof(key.pfrkt_t), flags)) {
			return EFAULT;
		}
		pfr_table_copyin_cleanup(&key.pfrkt_t);
		if (pfr_validate_table(&key.pfrkt_t, 0,
		    flags & PFR_FLAG_USERIOCTL)) {
			return EINVAL;
		}
		p = RB_FIND(pfr_ktablehead, &pfr_ktables, &key);
		if (p != NULL && (p->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
			SLIST_FOREACH(q, &workq, pfrkt_workq)
			if (!pfr_ktable_compare(p, q)) {
				goto _skip;
			}
			p->pfrkt_nflags = p->pfrkt_flags & ~PFR_TFLAG_ACTIVE;
			SLIST_INSERT_HEAD(&workq, p, pfrkt_workq);
			xdel++;
		}
_skip:
		;
	}

	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_setflags_ktables(&workq);
	}
	if (ndel != NULL) {
		*ndel = xdel;
	}
	return 0;
}

int
pfr_get_tables(struct pfr_table *filter, user_addr_t tbl, int *size,
    int flags)
{
	struct pfr_ktable       *p;
	int                      n, nn;

	ACCEPT_FLAGS(flags, PFR_FLAG_ALLRSETS);
	if (pfr_fix_anchor(filter->pfrt_anchor)) {
		return EINVAL;
	}
	n = nn = pfr_table_count(filter, flags);
	if (n < 0) {
		return ENOENT;
	}
	if (n > *size) {
		*size = n;
		return 0;
	}
	RB_FOREACH(p, pfr_ktablehead, &pfr_ktables) {
		if (pfr_skip_table(filter, p, flags)) {
			continue;
		}
		if (n-- <= 0) {
			continue;
		}
		if (COPYOUT(&p->pfrkt_t, tbl, sizeof(p->pfrkt_t), flags)) {
			return EFAULT;
		}
		tbl += sizeof(p->pfrkt_t);
	}
	if (n) {
		printf("pfr_get_tables: corruption detected (%d).\n", n);
		return ENOTTY;
	}
	*size = nn;
	return 0;
}

int
pfr_get_tstats(struct pfr_table *filter, user_addr_t tbl, int *size,
    int flags)
{
	struct pfr_ktable       *p;
	struct pfr_ktableworkq   workq;
	int                      n, nn;
	u_int64_t                tzero = pf_calendar_time_second();

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	/* XXX PFR_FLAG_CLSTATS disabled */
	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_ALLRSETS);
	if (pfr_fix_anchor(filter->pfrt_anchor)) {
		return EINVAL;
	}
	n = nn = pfr_table_count(filter, flags);
	if (n < 0) {
		return ENOENT;
	}
	if (n > *size) {
		*size = n;
		return 0;
	}
	SLIST_INIT(&workq);
	RB_FOREACH(p, pfr_ktablehead, &pfr_ktables) {
		if (pfr_skip_table(filter, p, flags)) {
			continue;
		}
		if (n-- <= 0) {
			continue;
		}
		if (COPYOUT(&p->pfrkt_ts, tbl, sizeof(p->pfrkt_ts), flags)) {
			return EFAULT;
		}
		tbl += sizeof(p->pfrkt_ts);
		SLIST_INSERT_HEAD(&workq, p, pfrkt_workq);
	}
	if (flags & PFR_FLAG_CLSTATS) {
		pfr_clstats_ktables(&workq, tzero,
		    flags & PFR_FLAG_ADDRSTOO);
	}
	if (n) {
		printf("pfr_get_tstats: corruption detected (%d).\n", n);
		return ENOTTY;
	}
	*size = nn;
	return 0;
}

int
pfr_clr_tstats(user_addr_t tbl, int size, int *nzero, int flags)
{
	struct pfr_ktableworkq   workq;
	struct pfr_ktable       *p, key;
	int                      i, xzero = 0;
	u_int64_t                tzero = pf_calendar_time_second();

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY |
	    PFR_FLAG_ADDRSTOO);
	SLIST_INIT(&workq);
	for (i = 0; i < size; i++, tbl += sizeof(key.pfrkt_t)) {
		if (COPYIN(tbl, &key.pfrkt_t, sizeof(key.pfrkt_t), flags)) {
			return EFAULT;
		}
		pfr_table_copyin_cleanup(&key.pfrkt_t);
		if (pfr_validate_table(&key.pfrkt_t, 0, 0)) {
			return EINVAL;
		}
		p = RB_FIND(pfr_ktablehead, &pfr_ktables, &key);
		if (p != NULL) {
			SLIST_INSERT_HEAD(&workq, p, pfrkt_workq);
			xzero++;
		}
	}
	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_clstats_ktables(&workq, tzero, flags & PFR_FLAG_ADDRSTOO);
	}
	if (nzero != NULL) {
		*nzero = xzero;
	}
	return 0;
}

int
pfr_set_tflags(user_addr_t tbl, int size, int setflag, int clrflag,
    int *nchange, int *ndel, int flags)
{
	struct pfr_ktableworkq   workq;
	struct pfr_ktable       *p, *q, key;
	int                      i, xchange = 0, xdel = 0;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY);
	if ((setflag & ~PFR_TFLAG_USRMASK) ||
	    (clrflag & ~PFR_TFLAG_USRMASK) ||
	    (setflag & clrflag)) {
		return EINVAL;
	}
	SLIST_INIT(&workq);
	for (i = 0; i < size; i++, tbl += sizeof(key.pfrkt_t)) {
		if (COPYIN(tbl, &key.pfrkt_t, sizeof(key.pfrkt_t), flags)) {
			return EFAULT;
		}
		pfr_table_copyin_cleanup(&key.pfrkt_t);
		if (pfr_validate_table(&key.pfrkt_t, 0,
		    flags & PFR_FLAG_USERIOCTL)) {
			return EINVAL;
		}
		p = RB_FIND(pfr_ktablehead, &pfr_ktables, &key);
		if (p != NULL && (p->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
			p->pfrkt_nflags = (p->pfrkt_flags | setflag) &
			    ~clrflag;
			if (p->pfrkt_nflags == p->pfrkt_flags) {
				goto _skip;
			}
			SLIST_FOREACH(q, &workq, pfrkt_workq)
			if (!pfr_ktable_compare(p, q)) {
				goto _skip;
			}
			SLIST_INSERT_HEAD(&workq, p, pfrkt_workq);
			if ((p->pfrkt_flags & PFR_TFLAG_PERSIST) &&
			    (clrflag & PFR_TFLAG_PERSIST) &&
			    !(p->pfrkt_flags & PFR_TFLAG_REFERENCED)) {
				xdel++;
			} else {
				xchange++;
			}
		}
_skip:
		;
	}
	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_setflags_ktables(&workq);
	}
	if (nchange != NULL) {
		*nchange = xchange;
	}
	if (ndel != NULL) {
		*ndel = xdel;
	}
	return 0;
}

int
pfr_ina_begin(struct pfr_table *trs, u_int32_t *ticket, int *ndel, int flags)
{
	struct pfr_ktableworkq   workq;
	struct pfr_ktable       *p;
	struct pf_ruleset       *rs;
	int                      xdel = 0;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	ACCEPT_FLAGS(flags, PFR_FLAG_DUMMY);
	rs = pf_find_or_create_ruleset(trs->pfrt_anchor);
	if (rs == NULL) {
		return ENOMEM;
	}
	SLIST_INIT(&workq);
	RB_FOREACH(p, pfr_ktablehead, &pfr_ktables) {
		if (!(p->pfrkt_flags & PFR_TFLAG_INACTIVE) ||
		    pfr_skip_table(trs, p, 0)) {
			continue;
		}
		p->pfrkt_nflags = p->pfrkt_flags & ~PFR_TFLAG_INACTIVE;
		SLIST_INSERT_HEAD(&workq, p, pfrkt_workq);
		xdel++;
	}
	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_setflags_ktables(&workq);
		if (ticket != NULL) {
			*ticket = ++rs->tticket;
		}
		rs->topen = 1;
	} else {
		pf_remove_if_empty_ruleset(rs);
	}
	if (ndel != NULL) {
		*ndel = xdel;
	}
	return 0;
}

int
pfr_ina_define(struct pfr_table *tbl, user_addr_t addr, int size,
    int *nadd, int *naddr, u_int32_t ticket, int flags)
{
	struct pfr_ktableworkq   tableq;
	struct pfr_kentryworkq   addrq;
	struct pfr_ktable       *kt, *rt, *shadow, key;
	struct pfr_kentry       *p;
	struct pfr_addr          ad;
	struct pf_ruleset       *rs;
	int                      i, rv, xadd = 0, xaddr = 0;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	ACCEPT_FLAGS(flags, PFR_FLAG_DUMMY | PFR_FLAG_ADDRSTOO);
	if (size && !(flags & PFR_FLAG_ADDRSTOO)) {
		return EINVAL;
	}
	if (pfr_validate_table(tbl, PFR_TFLAG_USRMASK,
	    flags & PFR_FLAG_USERIOCTL)) {
		return EINVAL;
	}
	rs = pf_find_ruleset(tbl->pfrt_anchor);
	if (rs == NULL || !rs->topen || ticket != rs->tticket) {
		return EBUSY;
	}
	tbl->pfrt_flags |= PFR_TFLAG_INACTIVE;
	SLIST_INIT(&tableq);
	kt = RB_FIND(pfr_ktablehead, &pfr_ktables, (struct pfr_ktable *)(void *)tbl);
	if (kt == NULL) {
		kt = pfr_create_ktable(tbl, 0, 1);
		if (kt == NULL) {
			return ENOMEM;
		}
		SLIST_INSERT_HEAD(&tableq, kt, pfrkt_workq);
		xadd++;
		if (!tbl->pfrt_anchor[0]) {
			goto _skip;
		}

		/* find or create root table */
		bzero(&key, sizeof(key));
		strlcpy(key.pfrkt_name, tbl->pfrt_name,
		    sizeof(key.pfrkt_name));
		rt = RB_FIND(pfr_ktablehead, &pfr_ktables, &key);
		if (rt != NULL) {
			kt->pfrkt_root = rt;
			goto _skip;
		}
		rt = pfr_create_ktable(&key.pfrkt_t, 0, 1);
		if (rt == NULL) {
			pfr_destroy_ktables(&tableq, 0);
			return ENOMEM;
		}
		SLIST_INSERT_HEAD(&tableq, rt, pfrkt_workq);
		kt->pfrkt_root = rt;
	} else if (!(kt->pfrkt_flags & PFR_TFLAG_INACTIVE)) {
		xadd++;
	}
_skip:
	shadow = pfr_create_ktable(tbl, 0, 0);
	if (shadow == NULL) {
		pfr_destroy_ktables(&tableq, 0);
		return ENOMEM;
	}
	SLIST_INIT(&addrq);
	for (i = 0; i < size; i++, addr += sizeof(ad)) {
		if (COPYIN(addr, &ad, sizeof(ad), flags)) {
			senderr(EFAULT);
		}
		if (pfr_validate_addr(&ad)) {
			senderr(EINVAL);
		}
		if (pfr_lookup_addr(shadow, &ad, 1) != NULL) {
			continue;
		}
		p = pfr_create_kentry(&ad, FALSE);
		if (p == NULL) {
			senderr(ENOMEM);
		}
		if (pfr_route_kentry(shadow, p)) {
			pfr_destroy_kentry(p);
			continue;
		}
		SLIST_INSERT_HEAD(&addrq, p, pfrke_workq);
		xaddr++;
	}
	if (!(flags & PFR_FLAG_DUMMY)) {
		if (kt->pfrkt_shadow != NULL) {
			pfr_destroy_ktable(kt->pfrkt_shadow, 1);
		}
		kt->pfrkt_flags |= PFR_TFLAG_INACTIVE;
		pfr_insert_ktables(&tableq);
		shadow->pfrkt_cnt = (flags & PFR_FLAG_ADDRSTOO) ?
		    xaddr : NO_ADDRESSES;
		kt->pfrkt_shadow = shadow;
	} else {
		pfr_clean_node_mask(shadow, &addrq);
		pfr_destroy_ktable(shadow, 0);
		pfr_destroy_ktables(&tableq, 0);
		pfr_destroy_kentries(&addrq);
	}
	if (nadd != NULL) {
		*nadd = xadd;
	}
	if (naddr != NULL) {
		*naddr = xaddr;
	}
	return 0;
_bad:
	pfr_destroy_ktable(shadow, 0);
	pfr_destroy_ktables(&tableq, 0);
	pfr_destroy_kentries(&addrq);
	return rv;
}

int
pfr_ina_rollback(struct pfr_table *trs, u_int32_t ticket, int *ndel, int flags)
{
	struct pfr_ktableworkq   workq;
	struct pfr_ktable       *p;
	struct pf_ruleset       *rs;
	int                      xdel = 0;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	ACCEPT_FLAGS(flags, PFR_FLAG_DUMMY);
	rs = pf_find_ruleset(trs->pfrt_anchor);
	if (rs == NULL || !rs->topen || ticket != rs->tticket) {
		return 0;
	}
	SLIST_INIT(&workq);
	RB_FOREACH(p, pfr_ktablehead, &pfr_ktables) {
		if (!(p->pfrkt_flags & PFR_TFLAG_INACTIVE) ||
		    pfr_skip_table(trs, p, 0)) {
			continue;
		}
		p->pfrkt_nflags = p->pfrkt_flags & ~PFR_TFLAG_INACTIVE;
		SLIST_INSERT_HEAD(&workq, p, pfrkt_workq);
		xdel++;
	}
	if (!(flags & PFR_FLAG_DUMMY)) {
		pfr_setflags_ktables(&workq);
		rs->topen = 0;
		pf_remove_if_empty_ruleset(rs);
	}
	if (ndel != NULL) {
		*ndel = xdel;
	}
	return 0;
}

int
pfr_ina_commit(struct pfr_table *trs, u_int32_t ticket, int *nadd,
    int *nchange, int flags)
{
	struct pfr_ktable       *p, *q;
	struct pfr_ktableworkq   workq;
	struct pf_ruleset       *rs;
	int                      xadd = 0, xchange = 0;
	u_int64_t                tzero = pf_calendar_time_second();

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	ACCEPT_FLAGS(flags, PFR_FLAG_ATOMIC | PFR_FLAG_DUMMY);
	rs = pf_find_ruleset(trs->pfrt_anchor);
	if (rs == NULL || !rs->topen || ticket != rs->tticket) {
		return EBUSY;
	}

	SLIST_INIT(&workq);
	RB_FOREACH(p, pfr_ktablehead, &pfr_ktables) {
		if (!(p->pfrkt_flags & PFR_TFLAG_INACTIVE) ||
		    pfr_skip_table(trs, p, 0)) {
			continue;
		}
		SLIST_INSERT_HEAD(&workq, p, pfrkt_workq);
		if (p->pfrkt_flags & PFR_TFLAG_ACTIVE) {
			xchange++;
		} else {
			xadd++;
		}
	}

	if (!(flags & PFR_FLAG_DUMMY)) {
		for (p = SLIST_FIRST(&workq); p != NULL; p = q) {
			q = SLIST_NEXT(p, pfrkt_workq);
			pfr_commit_ktable(p, tzero);
		}
		rs->topen = 0;
		pf_remove_if_empty_ruleset(rs);
	}
	if (nadd != NULL) {
		*nadd = xadd;
	}
	if (nchange != NULL) {
		*nchange = xchange;
	}

	return 0;
}

static void
pfr_commit_ktable(struct pfr_ktable *kt, u_int64_t tzero)
{
	struct pfr_ktable       *shadow = kt->pfrkt_shadow;
	int                      nflags;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	if (shadow->pfrkt_cnt == NO_ADDRESSES) {
		if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
			pfr_clstats_ktable(kt, tzero, 1);
		}
	} else if (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) {
		/* kt might contain addresses */
		struct pfr_kentryworkq   addrq, addq, changeq, delq, garbageq;
		struct pfr_kentry       *p, *q, *next;
		struct pfr_addr          ad;

		pfr_enqueue_addrs(shadow, &addrq, NULL, 0);
		pfr_mark_addrs(kt);
		SLIST_INIT(&addq);
		SLIST_INIT(&changeq);
		SLIST_INIT(&delq);
		SLIST_INIT(&garbageq);
		pfr_clean_node_mask(shadow, &addrq);
		for (p = SLIST_FIRST(&addrq); p != NULL; p = next) {
			next = SLIST_NEXT(p, pfrke_workq);      /* XXX */
			pfr_copyout_addr(&ad, p);
			q = pfr_lookup_addr(kt, &ad, 1);
			if (q != NULL) {
				if (q->pfrke_not != p->pfrke_not) {
					SLIST_INSERT_HEAD(&changeq, q,
					    pfrke_workq);
				}
				q->pfrke_mark = 1;
				SLIST_INSERT_HEAD(&garbageq, p, pfrke_workq);
			} else {
				p->pfrke_tzero = tzero;
				SLIST_INSERT_HEAD(&addq, p, pfrke_workq);
			}
		}
		pfr_enqueue_addrs(kt, &delq, NULL, ENQUEUE_UNMARKED_ONLY);
		pfr_insert_kentries(kt, &addq, tzero);
		pfr_remove_kentries(kt, &delq);
		pfr_clstats_kentries(&changeq, tzero, INVERT_NEG_FLAG);
		pfr_destroy_kentries(&garbageq);
	} else {
		/* kt cannot contain addresses */
		SWAP(struct radix_node_head *, kt->pfrkt_ip4,
		    shadow->pfrkt_ip4);
		SWAP(struct radix_node_head *, kt->pfrkt_ip6,
		    shadow->pfrkt_ip6);
		SWAP(int, kt->pfrkt_cnt, shadow->pfrkt_cnt);
		pfr_clstats_ktable(kt, tzero, 1);
	}
	nflags = ((shadow->pfrkt_flags & PFR_TFLAG_USRMASK) |
	    (kt->pfrkt_flags & PFR_TFLAG_SETMASK) | PFR_TFLAG_ACTIVE) &
	    ~PFR_TFLAG_INACTIVE;
	pfr_destroy_ktable(shadow, 0);
	kt->pfrkt_shadow = NULL;
	pfr_setflags_ktable(kt, nflags);
}

void
pfr_table_copyin_cleanup(struct pfr_table *tbl)
{
	tbl->pfrt_anchor[sizeof(tbl->pfrt_anchor) - 1] = '\0';
	tbl->pfrt_name[sizeof(tbl->pfrt_name) - 1] = '\0';
}

static int
pfr_validate_table(struct pfr_table *tbl, int allowedflags, int no_reserved)
{
	size_t i;

	if (!tbl->pfrt_name[0]) {
		return -1;
	}
	if (no_reserved && strcmp(tbl->pfrt_anchor, PF_RESERVED_ANCHOR) == 0) {
		return -1;
	}
	if (tbl->pfrt_name[PF_TABLE_NAME_SIZE - 1]) {
		return -1;
	}
	for (i = strlen(tbl->pfrt_name); i < PF_TABLE_NAME_SIZE; i++) {
		if (tbl->pfrt_name[i]) {
			return -1;
		}
	}
	if (pfr_fix_anchor(tbl->pfrt_anchor)) {
		return -1;
	}
	if (tbl->pfrt_flags & ~allowedflags) {
		return -1;
	}
	return 0;
}

/*
 * Rewrite anchors referenced by tables to remove slashes
 * and check for validity.
 */
static int
pfr_fix_anchor(char *anchor)
{
	size_t siz = MAXPATHLEN;
	size_t i;

	if (anchor[0] == '/') {
		char *path;
		int off;

		path = anchor;
		off = 1;
		while (*++path == '/') {
			off++;
		}
		bcopy(path, anchor, siz - off);
		memset(anchor + siz - off, 0, off);
	}
	if (anchor[siz - 1]) {
		return -1;
	}
	for (i = strlen(anchor); i < siz; i++) {
		if (anchor[i]) {
			return -1;
		}
	}
	return 0;
}

static int
pfr_table_count(struct pfr_table *filter, int flags)
{
	struct pf_ruleset *rs;

	if (flags & PFR_FLAG_ALLRSETS) {
		return pfr_ktable_cnt;
	}
	if (filter->pfrt_anchor[0]) {
		rs = pf_find_ruleset(filter->pfrt_anchor);
		return (rs != NULL) ? rs->tables : -1;
	}
	return pf_main_ruleset.tables;
}

static int
pfr_skip_table(struct pfr_table *filter, struct pfr_ktable *kt, int flags)
{
	if (flags & PFR_FLAG_ALLRSETS) {
		return 0;
	}
	if (strcmp(filter->pfrt_anchor, kt->pfrkt_anchor)) {
		return 1;
	}
	return 0;
}

static void
pfr_insert_ktables(struct pfr_ktableworkq *workq)
{
	struct pfr_ktable       *p;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	SLIST_FOREACH(p, workq, pfrkt_workq)
	pfr_insert_ktable(p);
}

static void
pfr_insert_ktable(struct pfr_ktable *kt)
{
	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	RB_INSERT(pfr_ktablehead, &pfr_ktables, kt);
	pfr_ktable_cnt++;
	if (kt->pfrkt_root != NULL) {
		if (!kt->pfrkt_root->pfrkt_refcnt[PFR_REFCNT_ANCHOR]++) {
			pfr_setflags_ktable(kt->pfrkt_root,
			    kt->pfrkt_root->pfrkt_flags | PFR_TFLAG_REFDANCHOR);
		}
	}
}

static void
pfr_setflags_ktables(struct pfr_ktableworkq *workq)
{
	struct pfr_ktable       *p, *q;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	for (p = SLIST_FIRST(workq); p; p = q) {
		q = SLIST_NEXT(p, pfrkt_workq);
		pfr_setflags_ktable(p, p->pfrkt_nflags);
	}
}

static void
pfr_setflags_ktable(struct pfr_ktable *kt, int newf)
{
	struct pfr_kentryworkq  addrq;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	if (!(newf & PFR_TFLAG_REFERENCED) &&
	    !(newf & PFR_TFLAG_REFDANCHOR) &&
	    !(newf & PFR_TFLAG_PERSIST)) {
		newf &= ~PFR_TFLAG_ACTIVE;
	}
	if (!(newf & PFR_TFLAG_ACTIVE)) {
		newf &= ~PFR_TFLAG_USRMASK;
	}
	if (!(newf & PFR_TFLAG_SETMASK)) {
		RB_REMOVE(pfr_ktablehead, &pfr_ktables, kt);
		if (kt->pfrkt_root != NULL) {
			if (!--kt->pfrkt_root->pfrkt_refcnt[PFR_REFCNT_ANCHOR]) {
				pfr_setflags_ktable(kt->pfrkt_root,
				    kt->pfrkt_root->pfrkt_flags &
				    ~PFR_TFLAG_REFDANCHOR);
			}
		}
		pfr_destroy_ktable(kt, 1);
		pfr_ktable_cnt--;
		return;
	}
	if (!(newf & PFR_TFLAG_ACTIVE) && kt->pfrkt_cnt) {
		pfr_enqueue_addrs(kt, &addrq, NULL, 0);
		pfr_remove_kentries(kt, &addrq);
	}
	if (!(newf & PFR_TFLAG_INACTIVE) && kt->pfrkt_shadow != NULL) {
		pfr_destroy_ktable(kt->pfrkt_shadow, 1);
		kt->pfrkt_shadow = NULL;
	}
	kt->pfrkt_flags = newf;
}

static void
pfr_clstats_ktables(struct pfr_ktableworkq *workq, u_int64_t tzero, int recurse)
{
	struct pfr_ktable       *p;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	SLIST_FOREACH(p, workq, pfrkt_workq)
	pfr_clstats_ktable(p, tzero, recurse);
}

static void
pfr_clstats_ktable(struct pfr_ktable *kt, u_int64_t tzero, int recurse)
{
	struct pfr_kentryworkq   addrq;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	if (recurse) {
		pfr_enqueue_addrs(kt, &addrq, NULL, 0);
		pfr_clstats_kentries(&addrq, tzero, 0);
	}
	bzero(kt->pfrkt_packets, sizeof(kt->pfrkt_packets));
	bzero(kt->pfrkt_bytes, sizeof(kt->pfrkt_bytes));
	kt->pfrkt_match = kt->pfrkt_nomatch = 0;
	kt->pfrkt_tzero = tzero;
}

static struct pfr_ktable *
pfr_create_ktable(struct pfr_table *tbl, u_int64_t tzero, int attachruleset)
{
	struct pfr_ktable       *kt;
	struct pf_ruleset       *rs;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	kt = pool_get(&pfr_ktable_pl, PR_WAITOK);
	if (kt == NULL) {
		return NULL;
	}
	bzero(kt, sizeof(*kt));
	kt->pfrkt_t = *tbl;

	if (attachruleset) {
		rs = pf_find_or_create_ruleset(tbl->pfrt_anchor);
		if (!rs) {
			pfr_destroy_ktable(kt, 0);
			return NULL;
		}
		kt->pfrkt_rs = rs;
		rs->tables++;
	}

	if (!rn_inithead((void **)&kt->pfrkt_ip4,
	    offsetof(struct sockaddr_in, sin_addr) * 8) ||
	    !rn_inithead((void **)&kt->pfrkt_ip6,
	    offsetof(struct sockaddr_in6, sin6_addr) * 8)) {
		pfr_destroy_ktable(kt, 0);
		return NULL;
	}
	kt->pfrkt_tzero = tzero;

	return kt;
}

static void
pfr_destroy_ktables(struct pfr_ktableworkq *workq, int flushaddr)
{
	struct pfr_ktable       *p, *q;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	for (p = SLIST_FIRST(workq); p; p = q) {
		q = SLIST_NEXT(p, pfrkt_workq);
		pfr_destroy_ktable(p, flushaddr);
	}
}

static void
pfr_destroy_ktable(struct pfr_ktable *kt, int flushaddr)
{
	struct pfr_kentryworkq   addrq;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	if (flushaddr) {
		pfr_enqueue_addrs(kt, &addrq, NULL, 0);
		pfr_clean_node_mask(kt, &addrq);
		pfr_destroy_kentries(&addrq);
	}
	if (kt->pfrkt_ip4 != NULL) {
		_FREE((caddr_t)kt->pfrkt_ip4, M_RTABLE);
	}
	if (kt->pfrkt_ip6 != NULL) {
		_FREE((caddr_t)kt->pfrkt_ip6, M_RTABLE);
	}
	if (kt->pfrkt_shadow != NULL) {
		pfr_destroy_ktable(kt->pfrkt_shadow, flushaddr);
	}
	if (kt->pfrkt_rs != NULL) {
		kt->pfrkt_rs->tables--;
		pf_remove_if_empty_ruleset(kt->pfrkt_rs);
	}
	pool_put(&pfr_ktable_pl, kt);
}

static int
pfr_ktable_compare(struct pfr_ktable *p, struct pfr_ktable *q)
{
	int d;

	if ((d = strncmp(p->pfrkt_name, q->pfrkt_name, PF_TABLE_NAME_SIZE))) {
		return d;
	}
	return strcmp(p->pfrkt_anchor, q->pfrkt_anchor);
}

static struct pfr_ktable *
pfr_lookup_table(struct pfr_table *tbl)
{
	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	/* struct pfr_ktable start like a struct pfr_table */
	return RB_FIND(pfr_ktablehead, &pfr_ktables,
	           (struct pfr_ktable *)(void *)tbl);
}

int
pfr_match_addr(struct pfr_ktable *kt, struct pf_addr *a, sa_family_t af)
{
	struct pfr_kentry       *ke = NULL;
	int                      match;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) {
		kt = kt->pfrkt_root;
	}
	if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return 0;
	}

	switch (af) {
#if INET
	case AF_INET:
		pfr_sin.sin_addr.s_addr = a->addr32[0];
		ke = (struct pfr_kentry *)rn_match(&pfr_sin, kt->pfrkt_ip4);
		if (ke && KENTRY_RNF_ROOT(ke)) {
			ke = NULL;
		}
		break;
#endif /* INET */
	case AF_INET6:
		bcopy(a, &pfr_sin6.sin6_addr, sizeof(pfr_sin6.sin6_addr));
		ke = (struct pfr_kentry *)rn_match(&pfr_sin6, kt->pfrkt_ip6);
		if (ke && KENTRY_RNF_ROOT(ke)) {
			ke = NULL;
		}
		break;
	}
	match = (ke && !ke->pfrke_not);
	if (match) {
		kt->pfrkt_match++;
	} else {
		kt->pfrkt_nomatch++;
	}
	return match;
}

void
pfr_update_stats(struct pfr_ktable *kt, struct pf_addr *a, sa_family_t af,
    u_int64_t len, int dir_out, int op_pass, int notrule)
{
	struct pfr_kentry       *ke = NULL;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) {
		kt = kt->pfrkt_root;
	}
	if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return;
	}

	switch (af) {
#if INET
	case AF_INET:
		pfr_sin.sin_addr.s_addr = a->addr32[0];
		ke = (struct pfr_kentry *)rn_match(&pfr_sin, kt->pfrkt_ip4);
		if (ke && KENTRY_RNF_ROOT(ke)) {
			ke = NULL;
		}
		break;
#endif /* INET */
	case AF_INET6:
		bcopy(a, &pfr_sin6.sin6_addr, sizeof(pfr_sin6.sin6_addr));
		ke = (struct pfr_kentry *)rn_match(&pfr_sin6, kt->pfrkt_ip6);
		if (ke && KENTRY_RNF_ROOT(ke)) {
			ke = NULL;
		}
		break;
	default:
		;
	}
	if ((ke == NULL || ke->pfrke_not) != notrule) {
		if (op_pass != PFR_OP_PASS) {
			printf("pfr_update_stats: assertion failed.\n");
		}
		op_pass = PFR_OP_XPASS;
	}
	kt->pfrkt_packets[dir_out][op_pass]++;
	kt->pfrkt_bytes[dir_out][op_pass] += len;
	if (ke != NULL && op_pass != PFR_OP_XPASS) {
		ke->pfrke_packets[dir_out][op_pass]++;
		ke->pfrke_bytes[dir_out][op_pass] += len;
	}
}

struct pfr_ktable *
pfr_attach_table(struct pf_ruleset *rs, char *name)
{
	struct pfr_ktable       *kt, *rt;
	struct pfr_table         tbl;
	struct pf_anchor        *ac = rs->anchor;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	bzero(&tbl, sizeof(tbl));
	strlcpy(tbl.pfrt_name, name, sizeof(tbl.pfrt_name));
	if (ac != NULL) {
		strlcpy(tbl.pfrt_anchor, ac->path, sizeof(tbl.pfrt_anchor));
	}
	kt = pfr_lookup_table(&tbl);
	if (kt == NULL) {
		kt = pfr_create_ktable(&tbl, pf_calendar_time_second(), 1);
		if (kt == NULL) {
			return NULL;
		}
		if (ac != NULL) {
			bzero(tbl.pfrt_anchor, sizeof(tbl.pfrt_anchor));
			rt = pfr_lookup_table(&tbl);
			if (rt == NULL) {
				rt = pfr_create_ktable(&tbl, 0, 1);
				if (rt == NULL) {
					pfr_destroy_ktable(kt, 0);
					return NULL;
				}
				pfr_insert_ktable(rt);
			}
			kt->pfrkt_root = rt;
		}
		pfr_insert_ktable(kt);
	}
	if (!kt->pfrkt_refcnt[PFR_REFCNT_RULE]++) {
		pfr_setflags_ktable(kt, kt->pfrkt_flags | PFR_TFLAG_REFERENCED);
	}
	return kt;
}

void
pfr_detach_table(struct pfr_ktable *kt)
{
	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	if (kt->pfrkt_refcnt[PFR_REFCNT_RULE] <= 0) {
		printf("pfr_detach_table: refcount = %d.\n",
		    kt->pfrkt_refcnt[PFR_REFCNT_RULE]);
	} else if (!--kt->pfrkt_refcnt[PFR_REFCNT_RULE]) {
		pfr_setflags_ktable(kt, kt->pfrkt_flags & ~PFR_TFLAG_REFERENCED);
	}
}

int
pfr_pool_get(struct pfr_ktable *kt, int *pidx, struct pf_addr *counter,
    struct pf_addr **raddr, struct pf_addr **rmask, sa_family_t af)
{
	struct pfr_kentry       *ke, *ke2;
	struct pf_addr          *addr;
	union sockaddr_union     mask;
	int                      idx = -1, use_counter = 0;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	if (af == AF_INET) {
		addr = (struct pf_addr *)&pfr_sin.sin_addr;
	} else if (af == AF_INET6) {
		addr = (struct pf_addr *)&pfr_sin6.sin6_addr;
	} else {
		return -1;
	}

	if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) {
		kt = kt->pfrkt_root;
	}
	if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE)) {
		return -1;
	}

	if (pidx != NULL) {
		idx = *pidx;
	}
	if (counter != NULL && idx >= 0) {
		use_counter = 1;
	}
	if (idx < 0) {
		idx = 0;
	}

_next_block:
	ke = pfr_kentry_byidx(kt, idx, af);
	if (ke == NULL) {
		kt->pfrkt_nomatch++;
		return 1;
	}
	pfr_prepare_network(&pfr_mask, af, ke->pfrke_net);
	*raddr = SUNION2PF(&ke->pfrke_sa, af);
	*rmask = SUNION2PF(&pfr_mask, af);

	if (use_counter) {
		/* is supplied address within block? */
		if (!PF_MATCHA(0, *raddr, *rmask, counter, af)) {
			/* no, go to next block in table */
			idx++;
			use_counter = 0;
			goto _next_block;
		}
		PF_ACPY(addr, counter, af);
	} else {
		/* use first address of block */
		PF_ACPY(addr, *raddr, af);
	}

	if (!KENTRY_NETWORK(ke)) {
		/* this is a single IP address - no possible nested block */
		PF_ACPY(counter, addr, af);
		*pidx = idx;
		kt->pfrkt_match++;
		return 0;
	}
	for (;;) {
		/* we don't want to use a nested block */
		if (af == AF_INET) {
			ke2 = (struct pfr_kentry *)rn_match(&pfr_sin,
			    kt->pfrkt_ip4);
		} else if (af == AF_INET6) {
			ke2 = (struct pfr_kentry *)rn_match(&pfr_sin6,
			    kt->pfrkt_ip6);
		} else {
			return -1; /* never happens */
		}
		/* no need to check KENTRY_RNF_ROOT() here */
		if (ke2 == ke) {
			/* lookup return the same block - perfect */
			PF_ACPY(counter, addr, af);
			*pidx = idx;
			kt->pfrkt_match++;
			return 0;
		}

		/* we need to increase the counter past the nested block */
		pfr_prepare_network(&mask, AF_INET, ke2->pfrke_net);
		PF_POOLMASK(addr, addr, SUNION2PF(&mask, af), &pfr_ffaddr, af);
		PF_AINC(addr, af);
		if (!PF_MATCHA(0, *raddr, *rmask, addr, af)) {
			/* ok, we reached the end of our main block */
			/* go to next block in table */
			idx++;
			use_counter = 0;
			goto _next_block;
		}
	}
}

static struct pfr_kentry *
pfr_kentry_byidx(struct pfr_ktable *kt, int idx, int af)
{
	struct pfr_walktree     w;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	bzero(&w, sizeof(w));
	w.pfrw_op = PFRW_POOL_GET;
	w.pfrw_cnt = idx;

	switch (af) {
#if INET
	case AF_INET:
		(void) kt->pfrkt_ip4->rnh_walktree(kt->pfrkt_ip4,
		    pfr_walktree, &w);
		return w.pfrw_kentry;
#endif /* INET */
	case AF_INET6:
		(void) kt->pfrkt_ip6->rnh_walktree(kt->pfrkt_ip6,
		    pfr_walktree, &w);
		return w.pfrw_kentry;
	default:
		return NULL;
	}
}

void
pfr_dynaddr_update(struct pfr_ktable *kt, struct pfi_dynaddr *dyn)
{
	struct pfr_walktree     w;

	LCK_MTX_ASSERT(pf_lock, LCK_MTX_ASSERT_OWNED);

	bzero(&w, sizeof(w));
	w.pfrw_op = PFRW_DYNADDR_UPDATE;
	w.pfrw_dyn = dyn;

	dyn->pfid_acnt4 = 0;
	dyn->pfid_acnt6 = 0;
	if (!dyn->pfid_af || dyn->pfid_af == AF_INET) {
		(void) kt->pfrkt_ip4->rnh_walktree(kt->pfrkt_ip4,
		    pfr_walktree, &w);
	}
	if (!dyn->pfid_af || dyn->pfid_af == AF_INET6) {
		(void) kt->pfrkt_ip6->rnh_walktree(kt->pfrkt_ip6,
		    pfr_walktree, &w);
	}
}
