sys/net/pf/pf_if.c - DragonflyBSD

root/sys/net/pf/pf_if.c
/*      $OpenBSD: pf_if.c,v 1.54 2008/06/14 16:55:28 mk Exp $ */

/*
 * Copyright 2005 Henning Brauer <henning@openbsd.org>
 * Copyright 2005 Ryan McBride <mcbride@openbsd.org>
 * Copyright (c) 2001 Daniel Hartmeier
 * Copyright (c) 2003 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 "opt_inet.h"
#include "opt_inet6.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/eventhandler.h>
#include <sys/filio.h>
#include <sys/msgport2.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/kernel.h>
#include <sys/thread2.h>
#include <sys/time.h>
#include <sys/lock.h>

#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/netisr2.h>
#include <net/netmsg2.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 <net/pf/pfvar.h>

#ifdef INET6
#include <netinet/ip6.h>
#endif /* INET6 */

struct pfi_kif          *pfi_all = NULL;
struct pfi_ifhead        pfi_ifs;
static long              pfi_update = 1;
static struct pfr_addr  *pfi_buffer;
static int               pfi_buffer_cnt;
static int               pfi_buffer_max;

static eventhandler_tag  pfi_attach_cookie;
static eventhandler_tag  pfi_detach_cookie;
static eventhandler_tag  pfi_attach_group_cookie;
static eventhandler_tag  pfi_detach_group_cookie;
static eventhandler_tag  pfi_change_group_cookie;
static eventhandler_tag  pfi_ifaddr_event_cookie;

static void      pfi_kif_update(struct pfi_kif *);
static void      pfi_dynaddr_update(struct pfi_dynaddr *);
static void      pfi_table_update(struct pfr_ktable *, struct pfi_kif *,
                    int, int);
static void      pfi_instance_add(struct ifnet *, int, int);
static void      pfi_address_add(struct sockaddr *, int, int);
static int       pfi_if_compare(struct pfi_kif *, struct pfi_kif *);
static int       pfi_skip_if(const char *, struct pfi_kif *);
static int       pfi_unmask(void *);

static void      pfi_attach_ifnet_event(void * __unused, struct ifnet *);
static void      pfi_detach_ifnet_event(void * __unused, struct ifnet *);
static void      pfi_attach_group_event(void * __unused, struct ifg_group *);
static void      pfi_detach_group_event(void * __unused, struct ifg_group *);
static void      pfi_change_group_event(void * __unused, char *);
static void      pfi_ifaddr_event(void * __unused, struct ifnet *,
                    enum ifaddr_event __unused, struct ifaddr * __unused);

static RB_PROTOTYPE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare);
static RB_GENERATE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare);

#define PFI_BUFFER_MAX          0x10000
static MALLOC_DEFINE(M_PFI, "pf_if", "pf interface");


void
pfi_initialize(void)
{
        struct ifnet *ifp;
        struct ifg_group *ifg;

        pfi_attach_cookie = EVENTHANDLER_REGISTER(ifnet_attach_event,
            pfi_attach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
        pfi_detach_cookie = EVENTHANDLER_REGISTER(ifnet_detach_event,
            pfi_detach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
        pfi_attach_group_cookie = EVENTHANDLER_REGISTER(group_attach_event,
            pfi_attach_group_event, NULL, EVENTHANDLER_PRI_ANY);
        pfi_detach_group_cookie = EVENTHANDLER_REGISTER(group_detach_event,
            pfi_detach_group_event, NULL, EVENTHANDLER_PRI_ANY);
        pfi_change_group_cookie = EVENTHANDLER_REGISTER(group_change_event,
            pfi_change_group_event, NULL, EVENTHANDLER_PRI_ANY);
        pfi_ifaddr_event_cookie = EVENTHANDLER_REGISTER(ifaddr_event,
            pfi_ifaddr_event, NULL, EVENTHANDLER_PRI_ANY);

        pfi_buffer_max = 64;
        pfi_buffer = kmalloc(pfi_buffer_max * sizeof(*pfi_buffer),
            M_PFI, M_WAITOK);

        if ((pfi_all = pfi_kif_get(IFG_ALL)) == NULL)
                panic("%s: pfi_kif_get(IFG_ALL) failed", __func__);

        ifgroup_lockmgr(LK_SHARED);
        TAILQ_FOREACH(ifg, &ifg_head, ifg_next)
                pfi_attach_ifgroup(ifg);
        ifgroup_lockmgr(LK_RELEASE);

        /* XXX ALMOST MPSAFE */
        ifnet_lock();
        TAILQ_FOREACH(ifp, &ifnetlist, if_link)
                pfi_attach_ifnet(ifp);
        ifnet_unlock();
}

void
pfi_cleanup(void)
{
        struct pfi_kif *kif;

        while ((kif = RB_MIN(pfi_ifhead, &pfi_ifs))) {
                RB_REMOVE(pfi_ifhead, &pfi_ifs, kif);
                if (kif->pfik_group)
                        kif->pfik_group->ifg_pf_kif = NULL;
                if (kif->pfik_ifp)
                        kif->pfik_ifp->if_pf_kif = NULL;
                kfree(kif, M_PFI);
        }
        kfree(pfi_buffer, M_PFI);
        pfi_buffer = NULL;
        pfi_all = NULL;

        EVENTHANDLER_DEREGISTER(ifnet_attach_event, pfi_attach_cookie);
        EVENTHANDLER_DEREGISTER(ifnet_detach_event, pfi_detach_cookie);
        EVENTHANDLER_DEREGISTER(group_attach_event, pfi_attach_group_cookie);
        EVENTHANDLER_DEREGISTER(group_detach_event, pfi_detach_group_cookie);
        EVENTHANDLER_DEREGISTER(group_change_event, pfi_change_group_cookie);
        EVENTHANDLER_DEREGISTER(ifaddr_event, pfi_ifaddr_event_cookie);
}

struct pfi_kif *
pfi_kif_find(const char *kif_name)
{
        struct pfi_kif_cmp s;

        bzero(&s, sizeof(s));
        strlcpy(s.pfik_name, kif_name, sizeof(s.pfik_name));

        return (RB_FIND(pfi_ifhead, &pfi_ifs, (struct pfi_kif *)&s));
}

struct pfi_kif *
pfi_kif_get(const char *kif_name)
{
        struct pfi_kif *kif;

        if ((kif = pfi_kif_find(kif_name)))
                return (kif);

        /*
         * Create a new one
         */
        kif = kmalloc(sizeof(*kif), M_PFI, M_WAITOK | M_ZERO);
        strlcpy(kif->pfik_name, kif_name, sizeof(kif->pfik_name));
        kif->pfik_tzero = time_second;
        TAILQ_INIT(&kif->pfik_dynaddrs);

        RB_INSERT(pfi_ifhead, &pfi_ifs, kif);
        return (kif);
}

void
pfi_kif_ref(struct pfi_kif *kif, enum pfi_kif_refs what)
{
        switch (what) {
        case PFI_KIF_REF_RULE:
                kif->pfik_rules++;
                break;
        case PFI_KIF_REF_STATE:
                kif->pfik_states++;
                break;
        default:
                panic("%s: unknown type", __func__);
        }
}

void
pfi_kif_unref(struct pfi_kif *kif, enum pfi_kif_refs what)
{
        if (kif == NULL)
                return;

        switch (what) {
        case PFI_KIF_REF_NONE:
                break;
        case PFI_KIF_REF_RULE:
                if (kif->pfik_rules <= 0) {
                        kprintf("%s: rules refcount <= 0\n", __func__);
                        return;
                }
                kif->pfik_rules--;
                break;
        case PFI_KIF_REF_STATE:
                if (kif->pfik_states <= 0) {
                        kprintf("%s: state refcount <= 0\n", __func__);
                        return;
                }
                kif->pfik_states--;
                break;
        default:
                panic("%s: unknown type", __func__);
        }

        if (kif->pfik_ifp != NULL || kif->pfik_group != NULL || kif == pfi_all)
                return;

        if (kif->pfik_rules || kif->pfik_states)
                return;

        RB_REMOVE(pfi_ifhead, &pfi_ifs, kif);
        kfree(kif, M_PFI);
}

int
pfi_kif_match(struct pfi_kif *rule_kif, struct pfi_kif *packet_kif)
{
        struct ifg_list *p;

        if (rule_kif == NULL || rule_kif == packet_kif)
                return (1);

        if (rule_kif->pfik_group != NULL) {
                ifgroup_lockmgr(LK_SHARED);
                TAILQ_FOREACH(p, &packet_kif->pfik_ifp->if_groups, ifgl_next) {
                        if (p->ifgl_group == rule_kif->pfik_group) {
                                ifgroup_lockmgr(LK_RELEASE);
                                return (1);
                        }
                }
                ifgroup_lockmgr(LK_RELEASE);
        }

        return (0);
}

void
pfi_attach_ifnet(struct ifnet *ifp)
{
        struct pfi_kif *kif;

        if (ifp->if_dunit == IF_DUNIT_NONE)
                return;

        crit_enter();
        pfi_update++;
        if ((kif = pfi_kif_get(ifp->if_xname)) == NULL)
                panic("%s: pfi_kif_get failed", __func__);
        kif->pfik_ifp = ifp;
        ifp->if_pf_kif = kif;
        pfi_kif_update(kif);
        crit_exit();
}

void
pfi_detach_ifnet(struct ifnet *ifp)
{
        struct pfi_kif *kif;

        if ((kif = (struct pfi_kif *)ifp->if_pf_kif) == NULL)
                return;

        crit_enter();
        pfi_update++;
        pfi_kif_update(kif);
        kif->pfik_ifp = NULL;
        ifp->if_pf_kif = NULL;
        pfi_kif_unref(kif, PFI_KIF_REF_NONE);
        crit_exit();
}

void
pfi_attach_ifgroup(struct ifg_group *ifg)
{
        struct pfi_kif *kif;

        crit_enter();
        pfi_update++;
        if ((kif = pfi_kif_get(ifg->ifg_group)) == NULL)
                panic("%s: pfi_kif_get failed", __func__);
        kif->pfik_group = ifg;
        ifg->ifg_pf_kif = kif;
        crit_exit();
}

void
pfi_detach_ifgroup(struct ifg_group *ifg)
{
        struct pfi_kif *kif;

        if ((kif = (struct pfi_kif *)ifg->ifg_pf_kif) == NULL)
                return;

        crit_enter();
        pfi_update++;
        kif->pfik_group = NULL;
        ifg->ifg_pf_kif = NULL;
        pfi_kif_unref(kif, PFI_KIF_REF_NONE);
        crit_exit();
}

void
pfi_group_change(const char *group)
{
        struct pfi_kif *kif;

        crit_enter();
        pfi_update++;
        if ((kif = pfi_kif_get(group)) == NULL)
                panic("%s: pfi_kif_get failed", __func__);
        pfi_kif_update(kif);
        crit_exit();
}

int
pfi_match_addr(struct pfi_dynaddr *dyn, struct pf_addr *a, sa_family_t af)
{
        switch (af) {
#ifdef INET
        case AF_INET:
                switch (dyn->pfid_acnt4) {
                case 0:
                        return (0);
                case 1:
                        return (PF_MATCHA(0, &dyn->pfid_addr4,
                            &dyn->pfid_mask4, a, AF_INET));
                default:
                        return (pfr_match_addr(dyn->pfid_kt, a, AF_INET));
                }
                break;
#endif /* INET */
#ifdef INET6
        case AF_INET6:
                switch (dyn->pfid_acnt6) {
                case 0:
                        return (0);
                case 1:
                        return (PF_MATCHA(0, &dyn->pfid_addr6,
                            &dyn->pfid_mask6, a, AF_INET6));
                default:
                        return (pfr_match_addr(dyn->pfid_kt, a, AF_INET6));
                }
                break;
#endif /* INET6 */
        default:
                return (0);
        }
}

int
pfi_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af)
{
        struct pfi_dynaddr      *dyn;
        char                     tblname[PF_TABLE_NAME_SIZE];
        struct pf_ruleset       *ruleset = NULL;
        int                      rv = 0;

        if (aw->type != PF_ADDR_DYNIFTL)
                return (0);
        if ((dyn = kmalloc(sizeof(struct pfi_dynaddr), M_PFI,
                           M_WAITOK | M_NULLOK | M_ZERO)) == NULL) {
                return (1);
        }

        crit_enter();
        if (strcmp(aw->v.ifname, "self") == 0)
                dyn->pfid_kif = pfi_kif_get(IFG_ALL);
        else
                dyn->pfid_kif = pfi_kif_get(aw->v.ifname);
        if (dyn->pfid_kif == NULL) {
                rv = 1;
                goto _bad;
        }
        pfi_kif_ref(dyn->pfid_kif, PFI_KIF_REF_RULE);

        dyn->pfid_net = pfi_unmask(&aw->v.a.mask);
        if (af == AF_INET && dyn->pfid_net == 32)
                dyn->pfid_net = 128;
        strlcpy(tblname, aw->v.ifname, sizeof(tblname));
        if (aw->iflags & PFI_AFLAG_NETWORK)
                strlcat(tblname, ":network", sizeof(tblname));
        if (aw->iflags & PFI_AFLAG_BROADCAST)
                strlcat(tblname, ":broadcast", sizeof(tblname));
        if (aw->iflags & PFI_AFLAG_PEER)
                strlcat(tblname, ":peer", sizeof(tblname));
        if (aw->iflags & PFI_AFLAG_NOALIAS)
                strlcat(tblname, ":0", sizeof(tblname));
        if (dyn->pfid_net != 128)
                ksnprintf(tblname + strlen(tblname),
                    sizeof(tblname) - strlen(tblname), "/%d", dyn->pfid_net);
        if ((ruleset = pf_find_or_create_ruleset(PF_RESERVED_ANCHOR)) == NULL) {
                rv = 1;
                goto _bad;
        }

        if ((dyn->pfid_kt = pfr_attach_table(ruleset, tblname)) == NULL) {
                rv = 1;
                goto _bad;
        }

        dyn->pfid_kt->pfrkt_flags |= PFR_TFLAG_ACTIVE;
        dyn->pfid_iflags = aw->iflags;
        dyn->pfid_af = af;

        TAILQ_INSERT_TAIL(&dyn->pfid_kif->pfik_dynaddrs, dyn, entry);
        aw->p.dyn = dyn;
        pfi_kif_update(dyn->pfid_kif);
        crit_exit();
        return (0);

_bad:
        if (dyn->pfid_kt != NULL)
                pfr_detach_table(dyn->pfid_kt);
        if (ruleset != NULL)
                pf_remove_if_empty_ruleset(ruleset);
        if (dyn->pfid_kif != NULL)
                pfi_kif_unref(dyn->pfid_kif, PFI_KIF_REF_RULE);
        kfree(dyn, M_PFI);
        crit_exit();
        return (rv);
}

static void
pfi_kif_update(struct pfi_kif *kif)
{
        struct ifg_list         *ifgl;
        struct pfi_dynaddr      *p;

        /* update all dynaddr */
        TAILQ_FOREACH(p, &kif->pfik_dynaddrs, entry)
                pfi_dynaddr_update(p);

        /* and for all groups that the kif belongs to */
        if (kif->pfik_ifp != NULL) {
                ifgroup_lockmgr(LK_SHARED);
                TAILQ_FOREACH(ifgl, &kif->pfik_ifp->if_groups, ifgl_next) {
                        pfi_kif_update((struct pfi_kif *)
                            ifgl->ifgl_group->ifg_pf_kif);
                }
                ifgroup_lockmgr(LK_RELEASE);
        }
}

static void
pfi_dynaddr_update(struct pfi_dynaddr *dyn)
{
        struct pfi_kif          *kif;
        struct pfr_ktable       *kt;

        if (dyn == NULL || dyn->pfid_kif == NULL || dyn->pfid_kt == NULL)
                panic("%s: bad argument", __func__);

        kif = dyn->pfid_kif;
        kt = dyn->pfid_kt;

        if (kt->pfrkt_larg != pfi_update) {
                /* this table needs to be brought up-to-date */
                pfi_table_update(kt, kif, dyn->pfid_net, dyn->pfid_iflags);
                kt->pfrkt_larg = pfi_update;
        }
        pfr_dynaddr_update(kt, dyn);
}

static void
pfi_table_update(struct pfr_ktable *kt, struct pfi_kif *kif, int net, int flags)
{
        int                      e, size2 = 0;
        struct ifg_member       *ifgm;

        pfi_buffer_cnt = 0;

        if (kif->pfik_ifp != NULL) {
                pfi_instance_add(kif->pfik_ifp, net, flags);
        } else if (kif->pfik_group != NULL) {
                ifgroup_lockmgr(LK_SHARED);
                TAILQ_FOREACH(ifgm, &kif->pfik_group->ifg_members, ifgm_next)
                        pfi_instance_add(ifgm->ifgm_ifp, net, flags);
                ifgroup_lockmgr(LK_RELEASE);
        }

        if ((e = pfr_set_addrs(&kt->pfrkt_t, pfi_buffer, pfi_buffer_cnt,
                               &size2, NULL, NULL, NULL, 0,
                               PFR_TFLAG_ALLMASK))) {
                kprintf("%s: cannot set %d new addresses into table %s: %d\n",
                    __func__, pfi_buffer_cnt, kt->pfrkt_name, e);
        }
}


struct netmsg_pfiadd {
        struct netmsg_base      base;
        struct ifnet            *ifp;
        int                     net;
        int                     flags;
};

static void
pfi_instance_add_dispatch(netmsg_t nmsg)
{
        struct netmsg_pfiadd *msg = (struct netmsg_pfiadd *)nmsg;
        struct ifaddr_container *ifac;
        int got4 = 0, got6 = 0;
        int net2, af;
        struct ifnet *ifp = msg->ifp;
        int net = msg->net, flags = msg->flags;

        if (ifp == NULL)
                goto done;
        /*
         * The ifaddr processing in the following loop will block,
         * however, this function is called in netisr0, in which
         * ifaddr list changes happen, so we don't care about the
         * blockness of the ifaddr processing here.
         */
        TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
                struct ifaddr *ia = ifac->ifa;

                if (ia->ifa_addr == NULL)
                        continue;
                af = ia->ifa_addr->sa_family;
                if (af != AF_INET && af != AF_INET6)
                        continue;
                /*
                 * XXX: For point-to-point interfaces, (ifname:0) and IPv4,
                 *      jump over address without a proper route to work
                 *      around a problem with ppp not fully removing the
                 *      address used during IPCP.
                 */
                if ((ifp->if_flags & IFF_POINTOPOINT) &&
                    !(ia->ifa_flags & IFA_ROUTE) &&
                    (flags & PFI_AFLAG_NOALIAS) && (af == AF_INET))
                        continue;
                if ((flags & PFI_AFLAG_BROADCAST) && af == AF_INET6)
                        continue;
                if ((flags & PFI_AFLAG_BROADCAST) &&
                    !(ifp->if_flags & IFF_BROADCAST))
                        continue;
                if ((flags & PFI_AFLAG_PEER) &&
                    !(ifp->if_flags & IFF_POINTOPOINT))
                        continue;
                if ((flags & (PFI_AFLAG_NETWORK | PFI_AFLAG_NOALIAS)) &&
                    af == AF_INET6 &&
                    IN6_IS_ADDR_LINKLOCAL(
                    &((struct sockaddr_in6 *)ia->ifa_addr)->sin6_addr))
                        continue;
                if (flags & PFI_AFLAG_NOALIAS) {
                        if (af == AF_INET && got4)
                                continue;
                        if (af == AF_INET6 && got6)
                                continue;
                }
                if (af == AF_INET)
                        got4 = 1;
                else if (af == AF_INET6)
                        got6 = 1;
                net2 = net;
                if (net2 == 128 && (flags & PFI_AFLAG_NETWORK)) {
                        if (af == AF_INET)
                                net2 = pfi_unmask(&((struct sockaddr_in *)
                                    ia->ifa_netmask)->sin_addr);
                        else if (af == AF_INET6)
                                net2 = pfi_unmask(&((struct sockaddr_in6 *)
                                    ia->ifa_netmask)->sin6_addr);
                }
                if (af == AF_INET && net2 > 32)
                        net2 = 32;
                if (flags & PFI_AFLAG_BROADCAST)
                        pfi_address_add(ia->ifa_broadaddr, af, net2);
                else if (flags & PFI_AFLAG_PEER)
                        pfi_address_add(ia->ifa_dstaddr, af, net2);
                else
                        pfi_address_add(ia->ifa_addr, af, net2);
        }
done:
        netisr_replymsg(&nmsg->base, 0);
}

static void
pfi_instance_add(struct ifnet *ifp, int net, int flags)
{
        struct netmsg_pfiadd msg;

        netmsg_init(&msg.base, NULL, &curthread->td_msgport, 0,
            pfi_instance_add_dispatch);
        msg.ifp = ifp;
        msg.net = net;
        msg.flags = flags;
        netisr_domsg(&msg.base, 0);
}

static void
pfi_address_add(struct sockaddr *sa, int af, int net)
{
        struct pfr_addr *p;
        int              i;

        if (pfi_buffer_cnt >= pfi_buffer_max) {
                int              new_max = pfi_buffer_max * 2;

                if (new_max > PFI_BUFFER_MAX) {
                        kprintf("%s: address buffer full (%d/%d)\n", __func__,
                            pfi_buffer_cnt, PFI_BUFFER_MAX);
                        return;
                }
                p = kmalloc(new_max * sizeof(*pfi_buffer), M_PFI, M_WAITOK);
                memcpy(pfi_buffer, p, pfi_buffer_cnt * sizeof(*pfi_buffer));
                /* no need to zero buffer */
                kfree(pfi_buffer, M_PFI);
                pfi_buffer = p;
                pfi_buffer_max = new_max;
        }
        if (af == AF_INET && net > 32)
                net = 128;
        p = pfi_buffer + pfi_buffer_cnt++;
        bzero(p, sizeof(*p));
        p->pfra_af = af;
        p->pfra_net = net;
        if (af == AF_INET)
                p->pfra_ip4addr = ((struct sockaddr_in *)sa)->sin_addr;
        else if (af == AF_INET6) {
                p->pfra_ip6addr = ((struct sockaddr_in6 *)sa)->sin6_addr;
                if (IN6_IS_SCOPE_EMBED(&p->pfra_ip6addr))
                        p->pfra_ip6addr.s6_addr16[1] = 0;
        }
        /* mask network address bits */
        if (net < 128)
                ((caddr_t)p)[p->pfra_net/8] &= ~(0xFF >> (p->pfra_net%8));
        for (i = (p->pfra_net+7)/8; i < sizeof(p->pfra_u); i++)
                ((caddr_t)p)[i] = 0;
}

void
pfi_dynaddr_remove(struct pf_addr_wrap *aw)
{
        if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL ||
            aw->p.dyn->pfid_kif == NULL || aw->p.dyn->pfid_kt == NULL)
                return;

        crit_enter();
        TAILQ_REMOVE(&aw->p.dyn->pfid_kif->pfik_dynaddrs, aw->p.dyn, entry);
        pfi_kif_unref(aw->p.dyn->pfid_kif, PFI_KIF_REF_RULE);
        aw->p.dyn->pfid_kif = NULL;
        pfr_detach_table(aw->p.dyn->pfid_kt);
        aw->p.dyn->pfid_kt = NULL;
        kfree(aw->p.dyn, M_PFI);
        aw->p.dyn = NULL;
        crit_exit();
}

void
pfi_dynaddr_copyout(struct pf_addr_wrap *aw)
{
        if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL ||
            aw->p.dyn->pfid_kif == NULL)
                return;
        aw->p.dyncnt = aw->p.dyn->pfid_acnt4 + aw->p.dyn->pfid_acnt6;
}

static int
pfi_if_compare(struct pfi_kif *p, struct pfi_kif *q)
{
        return (strncmp(p->pfik_name, q->pfik_name, IFNAMSIZ));
}

void
pfi_update_status(const char *name, struct pf_status *pfs)
{
        struct pfi_kif          *p;
        struct pfi_kif_cmp       key;
        struct ifg_member        p_member, *ifgm;
        TAILQ_HEAD(, ifg_member) ifg_members;
        int                      i, j, k;

        strlcpy(key.pfik_name, name, sizeof(key.pfik_name));
        crit_enter();
        p = RB_FIND(pfi_ifhead, &pfi_ifs, (struct pfi_kif *)&key);
        if (p == NULL) {
                crit_exit();
                return;
        }
        if (p->pfik_group != NULL) {
                bcopy(&p->pfik_group->ifg_members, &ifg_members,
                    sizeof(ifg_members));
        } else {
                /* build a temporary list for p only */
                bzero(&p_member, sizeof(p_member));
                p_member.ifgm_ifp = p->pfik_ifp;
                TAILQ_INIT(&ifg_members);
                TAILQ_INSERT_TAIL(&ifg_members, &p_member, ifgm_next);
        }
        if (pfs) {
                bzero(pfs->pcounters, sizeof(pfs->pcounters));
                bzero(pfs->bcounters, sizeof(pfs->bcounters));
        }
        ifgroup_lockmgr(LK_SHARED);
        TAILQ_FOREACH(ifgm, &ifg_members, ifgm_next) {
                if (ifgm->ifgm_ifp == NULL ||
                    ifgm->ifgm_ifp->if_pf_kif == NULL)
                        continue;
                p = (struct pfi_kif *)ifgm->ifgm_ifp->if_pf_kif;

                /* just clear statistics */
                if (pfs == NULL) {
                        bzero(p->pfik_packets, sizeof(p->pfik_packets));
                        bzero(p->pfik_bytes, sizeof(p->pfik_bytes));
                        p->pfik_tzero = time_second;
                        continue;
                }
                for (i = 0; i < 2; i++)
                        for (j = 0; j < 2; j++)
                                for (k = 0; k < 2; k++) {
                                        pfs->pcounters[i][j][k] +=
                                                p->pfik_packets[i][j][k];
                                        pfs->bcounters[i][j] +=
                                                p->pfik_bytes[i][j][k];
                                }
        }
        ifgroup_lockmgr(LK_RELEASE);
        crit_exit();
}

int
pfi_get_ifaces(const char *name, struct pfi_kif *buf, int *size)
{
        struct pfi_kif  *p, *nextp;
        int              n = 0;

        crit_enter();
        for (p = RB_MIN(pfi_ifhead, &pfi_ifs); p; p = nextp) {
                nextp = RB_NEXT(pfi_ifhead, &pfi_ifs, p);
                if (pfi_skip_if(name, p))
                        continue;
                if (*size > n++) {
                        if (!p->pfik_tzero)
                                p->pfik_tzero = time_second;
                        pfi_kif_ref(p, PFI_KIF_REF_RULE);
                        if (copyout(p, buf++, sizeof(*buf))) {
                                pfi_kif_unref(p, PFI_KIF_REF_RULE);
                                crit_exit();
                                return (EFAULT);
                        }
                        nextp = RB_NEXT(pfi_ifhead, &pfi_ifs, p);
                        pfi_kif_unref(p, PFI_KIF_REF_RULE);
                }
        }
        crit_exit();
        *size = n;
        return (0);
}

static int
pfi_skip_if(const char *filter, struct pfi_kif *p)
{
        struct ifg_list *ifg;
        int              n;

        if (filter == NULL || !*filter)
                return (0);
        if (strcmp(p->pfik_name, filter) == 0)
                return (0);     /* exact match */
        n = strlen(filter);
        if (n < 1 || n >= IFNAMSIZ)
                return (1);     /* sanity check */
        if (filter[n-1] >= '0' && filter[n-1] <= '9')
                return (1);     /* group names may not end in a digit */
        if (p->pfik_ifp != NULL) {
                ifgroup_lockmgr(LK_SHARED);
                TAILQ_FOREACH(ifg, &p->pfik_ifp->if_groups, ifgl_next) {
                        if (strcmp(ifg->ifgl_group->ifg_group, filter) == 0) {
                                ifgroup_lockmgr(LK_RELEASE);
                                return (0); /* iface is in group "filter" */
                        }
                }
                ifgroup_lockmgr(LK_RELEASE);
        }
        return (1);
}

int
pfi_set_flags(const char *name, int flags)
{
        struct pfi_kif  *p;

        crit_enter();
        RB_FOREACH(p, pfi_ifhead, &pfi_ifs) {
                if (pfi_skip_if(name, p))
                        continue;
                p->pfik_flags |= flags;
        }
        crit_exit();
        return (0);
}

int
pfi_clear_flags(const char *name, int flags)
{
        struct pfi_kif  *p;

        crit_enter();
        RB_FOREACH(p, pfi_ifhead, &pfi_ifs) {
                if (pfi_skip_if(name, p))
                        continue;
                p->pfik_flags &= ~flags;
        }
        crit_exit();
        return (0);
}

/* from pf_print_state.c */
static int
pfi_unmask(void *addr)
{
        struct pf_addr *m = addr;
        int i = 31, j = 0, b = 0;
        u_int32_t tmp;

        while (j < 4 && m->addr32[j] == 0xffffffff) {
                b += 32;
                j++;
        }
        if (j < 4) {
                tmp = ntohl(m->addr32[j]);
                for (i = 31; tmp & (1 << i); --i)
                        b++;
        }
        return (b);
}


/*
 * eventhandler events
 */

static void
pfi_attach_ifnet_event(void *arg __unused, struct ifnet *ifp)
{
        pfi_attach_ifnet(ifp);
}

static void
pfi_detach_ifnet_event(void *arg __unused, struct ifnet *ifp)
{
        pfi_detach_ifnet(ifp);
}

static void
pfi_attach_group_event(void *arg __unused, struct ifg_group *ifg)
{
        pfi_attach_ifgroup(ifg);
}

static void
pfi_detach_group_event(void *arg __unused, struct ifg_group *ifg)
{
        pfi_detach_ifgroup(ifg);
}

static void
pfi_change_group_event(void *arg __unused, char *gname)
{
        pfi_group_change(gname);
}

static void
pfi_ifaddr_event(void *arg __unused, struct ifnet *ifp,
                 enum ifaddr_event event __unused,
                 struct ifaddr *ifa __unused)
{
        if (ifp && ifp->if_pf_kif) {
                crit_enter();
                pfi_update++;
                pfi_kif_update(ifp->if_pf_kif);
                crit_exit();
        }
}