/* $OpenBSD: pfkeyv2.c,v 1.273 2026/02/10 20:24:34 tobhe Exp $ */

/*
 *      @(#)COPYRIGHT   1.1 (NRL) 17 January 1995
 *
 * NRL grants permission for redistribution and use in source and binary
 * forms, with or without modification, of the software and documentation
 * created at NRL provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgements:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 *      This product includes software developed at the Information
 *      Technology Division, US Naval Research Laboratory.
 * 4. Neither the name of the NRL nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL 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 NRL 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.
 *
 * The views and conclusions contained in the software and documentation
 * are those of the authors and should not be interpreted as representing
 * official policies, either expressed or implied, of the US Naval
 * Research Laboratory (NRL).
 */

/*
 * Copyright (c) 1995, 1996, 1997, 1998, 1999 Craig Metz. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the author nor the names of any contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 "pf.h"

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
#include <sys/pool.h>
#include <sys/mutex.h>

#include <netinet/ip_ipsp.h>
#include <net/pfkeyv2.h>
#include <net/radix.h>
#include <netinet/ip_ah.h>
#include <netinet/ip_esp.h>
#include <netinet/ip_ipcomp.h>
#include <crypto/blf.h>

#if NPF > 0
#include <net/if.h>
#include <net/pfvar.h>
#endif

#define PFKEYSNDQ       8192
#define PFKEYRCVQ       8192

static const struct sadb_alg ealgs[] = {
        { SADB_EALG_NULL, 0, 0, 0 },
        { SADB_EALG_3DESCBC, 64, 192, 192 },
        { SADB_X_EALG_BLF, 64, 40, BLF_MAXKEYLEN * 8},
        { SADB_X_EALG_CAST, 64, 40, 128},
        { SADB_X_EALG_AES, 128, 128, 256},
        { SADB_X_EALG_AESCTR, 128, 128 + 32, 256 + 32},
        { SADB_X_EALG_AESGCM16, 64, 128 + 32, 256 + 32},
        { SADB_X_EALG_AESGMAC, 64, 128 + 32, 256 + 32},
        { SADB_X_EALG_CHACHA20POLY1305, 64, 256 + 32, 256 + 32}
};

static const struct sadb_alg aalgs[] = {
        { SADB_AALG_SHA1HMAC, 0, 160, 160 },
        { SADB_AALG_MD5HMAC, 0, 128, 128 },
        { SADB_X_AALG_RIPEMD160HMAC, 0, 160, 160 },
        { SADB_X_AALG_SHA2_256, 0, 256, 256 },
        { SADB_X_AALG_SHA2_384, 0, 384, 384 },
        { SADB_X_AALG_SHA2_512, 0, 512, 512 }
};

static const struct sadb_alg calgs[] = {
        { SADB_X_CALG_DEFLATE, 0, 0, 0}
};

struct pool pkpcb_pool;
#define PFKEY_MSG_MAXSZ 4096
const struct sockaddr pfkey_addr = { 2, PF_KEY, };
const struct domain pfkeydomain;

/*
 * pfkey PCB
 *
 *  Locks used to protect struct members in this file:
 *      I       immutable after creation
 *      a       atomic operations
 *      l       pkptable's lock
 *      s       socket lock
 */
struct pkpcb {
        struct socket           *kcb_socket;    /* [I] associated socket */

        TAILQ_ENTRY(pkpcb)      kcb_list;       /* [l] */
        int                     kcb_flags;      /* [s] */
        uint32_t                kcb_reg;        /* [s] Inc if SATYPE_MAX > 31 */
        uint32_t                kcb_pid;        /* [I] */
        unsigned int            kcb_rdomain;    /* [I] routing domain */
};
#define sotokeycb(so)           ((struct pkpcb *)(so)->so_pcb)
#define keylock(kp)             solock((kp)->kcb_socket)
#define keyunlock(kp)           sounlock((kp)->kcb_socket)


struct dump_state {
        struct sadb_msg *sadb_msg;
        struct socket *socket;
};

struct pkptable {
        TAILQ_HEAD(, pkpcb)     pkp_list;
        struct rwlock           pkp_lk;
};

struct pkptable pkptable;
struct mutex pfkeyv2_mtx = MUTEX_INITIALIZER(IPL_MPFLOOR);
static uint32_t pfkeyv2_seq = 1;
static int nregistered = 0;
static int npromisc = 0;

void pfkey_init(void);

int pfkeyv2_attach(struct socket *, int, int);
int pfkeyv2_detach(struct socket *);
int pfkeyv2_disconnect(struct socket *);
int pfkeyv2_shutdown(struct socket *);
int pfkeyv2_send(struct socket *, struct mbuf *, struct mbuf *,
    struct mbuf *);
int pfkeyv2_sockaddr(struct socket *, struct mbuf *);
int pfkeyv2_peeraddr(struct socket *, struct mbuf *);
int pfkeyv2_output(struct mbuf *, struct socket *);
int pfkey_sendup(struct pkpcb *, struct mbuf *, int);
int pfkeyv2_sa_flush(struct tdb *, void *, int);
int pfkeyv2_policy_flush(struct ipsec_policy *, void *, unsigned int);
int pfkeyv2_sysctl_policydumper(struct ipsec_policy *, void *, unsigned int);

/*
 * Wrapper around m_devget(); copy data from contiguous buffer to mbuf
 * chain.
 */
int
pfdatatopacket(void *data, int len, struct mbuf **packet)
{
        if (!(*packet = m_devget(data, len, 0)))
                return (ENOMEM);

        /* Make sure, all data gets zeroized on free */
        (*packet)->m_flags |= M_ZEROIZE;

        return (0);
}

const struct pr_usrreqs pfkeyv2_usrreqs = {
        .pru_attach     = pfkeyv2_attach,
        .pru_detach     = pfkeyv2_detach,
        .pru_disconnect = pfkeyv2_disconnect,
        .pru_shutdown   = pfkeyv2_shutdown,
        .pru_send       = pfkeyv2_send,
        .pru_sockaddr   = pfkeyv2_sockaddr,
        .pru_peeraddr   = pfkeyv2_peeraddr,
};

const struct protosw pfkeysw[] = {
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &pfkeydomain,
  .pr_protocol  = PF_KEY_V2,
  .pr_flags     = PR_ATOMIC | PR_ADDR,
  .pr_usrreqs   = &pfkeyv2_usrreqs,
  .pr_sysctl    = pfkeyv2_sysctl,
}
};

const struct domain pfkeydomain = {
  .dom_family = PF_KEY,
  .dom_name = "pfkey",
  .dom_init = pfkey_init,
  .dom_protosw = pfkeysw,
  .dom_protoswNPROTOSW = &pfkeysw[nitems(pfkeysw)],
};

void
pfkey_init(void)
{
        rn_init(sizeof(struct sockaddr_encap));
        rw_init(&pkptable.pkp_lk, "pfkey");
        TAILQ_INIT(&pkptable.pkp_list);
        pool_init(&pkpcb_pool, sizeof(struct pkpcb), 0,
            IPL_SOFTNET, PR_WAITOK, "pkpcb", NULL);
        pool_init(&ipsec_policy_pool, sizeof(struct ipsec_policy), 0,
            IPL_SOFTNET, 0, "ipsec policy", NULL);
        pool_init(&ipsec_acquire_pool, sizeof(struct ipsec_acquire), 0,
            IPL_SOFTNET, 0, "ipsec acquire", NULL);
}


/*
 * Attach a new PF_KEYv2 socket.
 */
int
pfkeyv2_attach(struct socket *so, int proto, int wait)
{
        struct pkpcb *kp;
        int error;

        if ((so->so_state & SS_PRIV) == 0)
                return EACCES;

        error = soreserve(so, PFKEYSNDQ, PFKEYRCVQ);
        if (error)
                return (error);

        kp = pool_get(&pkpcb_pool, (wait == M_WAIT ? PR_WAITOK : PR_NOWAIT) |
            PR_ZERO);
        if (kp == NULL)
                return (ENOBUFS);
        so->so_pcb = kp;
        kp->kcb_socket = so;
        kp->kcb_pid = curproc->p_p->ps_pid;
        kp->kcb_rdomain = rtable_l2(curproc->p_p->ps_rtableid);

        so->so_options |= SO_USELOOPBACK;
        soisconnected(so);

        rw_enter(&pkptable.pkp_lk, RW_WRITE);
        TAILQ_INSERT_TAIL(&pkptable.pkp_list, kp, kcb_list);
        rw_exit(&pkptable.pkp_lk);

        return (0);
}

/*
 * Close a PF_KEYv2 socket.
 */
int
pfkeyv2_detach(struct socket *so)
{
        struct pkpcb *kp;

        soassertlocked(so);

        kp = sotokeycb(so);
        if (kp == NULL)
                return ENOTCONN;

        if (kp->kcb_flags &
            (PFKEYV2_SOCKETFLAGS_REGISTERED|PFKEYV2_SOCKETFLAGS_PROMISC)) {
                mtx_enter(&pfkeyv2_mtx);
                if (kp->kcb_flags & PFKEYV2_SOCKETFLAGS_REGISTERED)
                        nregistered--;

                if (kp->kcb_flags & PFKEYV2_SOCKETFLAGS_PROMISC)
                        npromisc--;
                mtx_leave(&pfkeyv2_mtx);
        }

        rw_enter(&pkptable.pkp_lk, RW_WRITE);
        TAILQ_REMOVE(&pkptable.pkp_list, kp, kcb_list);
        rw_exit(&pkptable.pkp_lk);

        so->so_pcb = NULL;
        KASSERT((so->so_state & SS_NOFDREF) == 0);
        pool_put(&pkpcb_pool, kp);

        return (0);
}

int
pfkeyv2_disconnect(struct socket *so)
{
        soisdisconnected(so);
        return (0);
}

int
pfkeyv2_shutdown(struct socket *so)
{
        socantsendmore(so);
        return (0);
}

int
pfkeyv2_send(struct socket *so, struct mbuf *m, struct mbuf *nam,
    struct mbuf *control)
{
        int error;

        soassertlocked(so);

        if (control && control->m_len) {
                error = EOPNOTSUPP;
                goto out;
        }
        
        if (nam) {
                error = EISCONN;
                goto out;
        }

        error = pfkeyv2_output(m, so);
        m = NULL;

out:
        m_freem(control);
        m_freem(m);

        return (error);
}

int
pfkeyv2_sockaddr(struct socket *so, struct mbuf *nam)
{
        return (EINVAL);
}

int
pfkeyv2_peeraddr(struct socket *so, struct mbuf *nam)
{
        /* minimal support, just implement a fake peer address */
        bcopy(&pfkey_addr, mtod(nam, caddr_t), pfkey_addr.sa_len);
        nam->m_len = pfkey_addr.sa_len;
        return (0);
}

int
pfkeyv2_output(struct mbuf *mbuf, struct socket *so)
{
        void *message;
        int error = 0;

#ifdef DIAGNOSTIC
        if (!mbuf || !(mbuf->m_flags & M_PKTHDR)) {
                error = EINVAL;
                goto ret;
        }
#endif /* DIAGNOSTIC */

        if (mbuf->m_pkthdr.len > PFKEY_MSG_MAXSZ) {
                error = EMSGSIZE;
                goto ret;
        }

        if (!(message = malloc((unsigned long) mbuf->m_pkthdr.len,
            M_PFKEY, M_DONTWAIT))) {
                error = ENOMEM;
                goto ret;
        }

        m_copydata(mbuf, 0, mbuf->m_pkthdr.len, message);

        /*
         * The socket can't be closed concurrently because the file
         * descriptor reference is still held.
         */

        sounlock(so);
        error = pfkeyv2_dosend(so, message, mbuf->m_pkthdr.len);
        solock(so);

ret:
        m_freem(mbuf);
        return (error);
}

int
pfkey_sendup(struct pkpcb *kp, struct mbuf *m0, int more)
{
        struct socket *so = kp->kcb_socket;
        struct mbuf *m;
        int ret;

        if (more) {
                if (!(m = m_dup_pkt(m0, 0, M_DONTWAIT)))
                        return (ENOMEM);
        } else
                m = m0;

        mtx_enter(&so->so_rcv.sb_mtx);
        ret = sbappendaddr(&so->so_rcv, &pfkey_addr, m, NULL);
        mtx_leave(&so->so_rcv.sb_mtx);

        if (ret == 0) {
                m_freem(m);
                return (ENOBUFS);
        }

        sorwakeup(so);
        return (0);
}

/*
 * Send a PFKEYv2 message, possibly to many receivers, based on the
 * satype of the socket (which is set by the REGISTER message), and the
 * third argument.
 */
int
pfkeyv2_sendmessage(void **headers, int mode, struct socket *so,
    u_int8_t satype, int count, u_int rdomain)
{
        int i, j, rval;
        void *p, *buffer = NULL;
        struct mbuf *packet;
        struct pkpcb *kp;
        struct sadb_msg *smsg;

        /* Find out how much space we'll need... */
        j = sizeof(struct sadb_msg);

        for (i = 1; i <= SADB_EXT_MAX; i++)
                if (headers[i])
                        j += ((struct sadb_ext *)headers[i])->sadb_ext_len *
                            sizeof(uint64_t);

        /* ...and allocate it */
        if (!(buffer = malloc(j + sizeof(struct sadb_msg), M_PFKEY,
            M_NOWAIT))) {
                rval = ENOMEM;
                goto ret;
        }

        p = buffer + sizeof(struct sadb_msg);
        bcopy(headers[0], p, sizeof(struct sadb_msg));
        ((struct sadb_msg *) p)->sadb_msg_len = j / sizeof(uint64_t);
        p += sizeof(struct sadb_msg);

        /* Copy payloads in the packet */
        for (i = 1; i <= SADB_EXT_MAX; i++)
                if (headers[i]) {
                        ((struct sadb_ext *) headers[i])->sadb_ext_type = i;
                        bcopy(headers[i], p, EXTLEN(headers[i]));
                        p += EXTLEN(headers[i]);
                }

        if ((rval = pfdatatopacket(buffer + sizeof(struct sadb_msg),
            j, &packet)) != 0)
                goto ret;

        switch (mode) {
        case PFKEYV2_SENDMESSAGE_UNICAST:
                /*
                 * Send message to the specified socket, plus all
                 * promiscuous listeners.
                 */
                pfkey_sendup(sotokeycb(so), packet, 0);

                /*
                 * Promiscuous messages contain the original message
                 * encapsulated in another sadb_msg header.
                 */
                bzero(buffer, sizeof(struct sadb_msg));
                smsg = (struct sadb_msg *) buffer;
                smsg->sadb_msg_version = PF_KEY_V2;
                smsg->sadb_msg_type = SADB_X_PROMISC;
                smsg->sadb_msg_len = (sizeof(struct sadb_msg) + j) /
                    sizeof(uint64_t);
                smsg->sadb_msg_seq = 0;

                /* Copy to mbuf chain */
                if ((rval = pfdatatopacket(buffer, sizeof(struct sadb_msg) + j,
                    &packet)) != 0)
                        goto ret;

                /*
                 * Search for promiscuous listeners, skipping the
                 * original destination.
                 */
                rw_enter_read(&pkptable.pkp_lk);
                TAILQ_FOREACH(kp, &pkptable.pkp_list, kcb_list) {
                        if (kp->kcb_socket == so || kp->kcb_rdomain != rdomain)
                                continue;

                        if (kp->kcb_flags & PFKEYV2_SOCKETFLAGS_PROMISC)
                                pfkey_sendup(kp, packet, 1);
                }
                rw_exit_read(&pkptable.pkp_lk);
                m_freem(packet);
                break;

        case PFKEYV2_SENDMESSAGE_REGISTERED:
                /*
                 * Send the message to all registered sockets that match
                 * the specified satype (e.g., all IPSEC-ESP negotiators)
                 */
                rw_enter_read(&pkptable.pkp_lk);
                TAILQ_FOREACH(kp, &pkptable.pkp_list, kcb_list) {
                        if (kp->kcb_rdomain != rdomain)
                                continue;

                        if (kp->kcb_flags & PFKEYV2_SOCKETFLAGS_REGISTERED) {
                                if (!satype) {
                                        /* Just send to everyone registered */
                                        pfkey_sendup(kp, packet, 1);
                                } else {
                                        uint32_t kcb_reg;

                                        kcb_reg = READ_ONCE(kp->kcb_reg);
                                        /* Check for specified satype */
                                        if ((1 << satype) & kcb_reg)
                                                pfkey_sendup(kp, packet, 1);
                                }
                        }
                }
                rw_exit_read(&pkptable.pkp_lk);
                /* Free last/original copy of the packet */
                m_freem(packet);

                /* Encapsulate the original message "inside" an sadb_msg header */
                bzero(buffer, sizeof(struct sadb_msg));
                smsg = (struct sadb_msg *) buffer;
                smsg->sadb_msg_version = PF_KEY_V2;
                smsg->sadb_msg_type = SADB_X_PROMISC;
                smsg->sadb_msg_len = (sizeof(struct sadb_msg) + j) /
                    sizeof(uint64_t);
                smsg->sadb_msg_seq = 0;

                /* Convert to mbuf chain */
                if ((rval = pfdatatopacket(buffer, sizeof(struct sadb_msg) + j,
                    &packet)) != 0)
                        goto ret;

                /* Send to all registered promiscuous listeners */
                rw_enter_read(&pkptable.pkp_lk);
                TAILQ_FOREACH(kp, &pkptable.pkp_list, kcb_list) {
                        int flags = READ_ONCE(kp->kcb_flags);

                        if (kp->kcb_rdomain != rdomain)
                                continue;

                        if ((flags & PFKEYV2_SOCKETFLAGS_PROMISC) &&
                            !(flags & PFKEYV2_SOCKETFLAGS_REGISTERED))
                                pfkey_sendup(kp, packet, 1);
                }
                rw_exit_read(&pkptable.pkp_lk);
                m_freem(packet);
                break;

        case PFKEYV2_SENDMESSAGE_BROADCAST:
                /* Send message to all sockets */
                rw_enter_read(&pkptable.pkp_lk);
                TAILQ_FOREACH(kp, &pkptable.pkp_list, kcb_list) {
                        if (kp->kcb_rdomain != rdomain)
                                continue;

                        pfkey_sendup(kp, packet, 1);
                }
                rw_exit_read(&pkptable.pkp_lk);
                m_freem(packet);
                break;
        }

ret:
        if (buffer != NULL) {
                explicit_bzero(buffer, j + sizeof(struct sadb_msg));
                free(buffer, M_PFKEY, j + sizeof(struct sadb_msg));
        }

        return (rval);
}

/*
 * Get SPD information for an ACQUIRE. We setup the message such that
 * the SRC/DST payloads are relative to us (regardless of whether the
 * SPD rule was for incoming or outgoing packets).
 */
int
pfkeyv2_policy(struct ipsec_acquire *ipa, void **headers, void **buffer,
    int *bufferlen)
{
        union sockaddr_union sunion;
        struct sadb_protocol *sp;
        int rval, i, dir;
        void *p;

        /* Find out how big a buffer we need */
        i = 4 * sizeof(struct sadb_address) + sizeof(struct sadb_protocol);
        bzero(&sunion, sizeof(union sockaddr_union));

        switch (ipa->ipa_info.sen_type) {
        case SENT_IP4:
                i += 4 * PADUP(sizeof(struct sockaddr_in));
                sunion.sa.sa_family = AF_INET;
                sunion.sa.sa_len = sizeof(struct sockaddr_in);
                dir = ipa->ipa_info.sen_direction;
                break;

#ifdef INET6
        case SENT_IP6:
                i += 4 * PADUP(sizeof(struct sockaddr_in6));
                sunion.sa.sa_family = AF_INET6;
                sunion.sa.sa_len = sizeof(struct sockaddr_in6);
                dir = ipa->ipa_info.sen_ip6_direction;
                break;
#endif /* INET6 */

        default:
                return (EINVAL);
        }

        if (!(p = malloc(i, M_PFKEY, M_NOWAIT | M_ZERO))) {
                rval = ENOMEM;
                goto ret;
        } else {
                *buffer = p;
                *bufferlen = i;
        }

        if (dir == IPSP_DIRECTION_OUT)
                headers[SADB_X_EXT_SRC_FLOW] = p;
        else
                headers[SADB_X_EXT_DST_FLOW] = p;
        switch (sunion.sa.sa_family) {
        case AF_INET:
                sunion.sin.sin_addr = ipa->ipa_info.sen_ip_src;
                sunion.sin.sin_port = ipa->ipa_info.sen_sport;
                break;

#ifdef INET6
        case AF_INET6:
                sunion.sin6.sin6_addr = ipa->ipa_info.sen_ip6_src;
                sunion.sin6.sin6_port = ipa->ipa_info.sen_ip6_sport;
                break;
#endif /* INET6 */
        }
        export_address(&p, &sunion.sa);

        if (dir == IPSP_DIRECTION_OUT)
                headers[SADB_X_EXT_SRC_MASK] = p;
        else
                headers[SADB_X_EXT_DST_MASK] = p;
        switch (sunion.sa.sa_family) {
        case AF_INET:
                sunion.sin.sin_addr = ipa->ipa_mask.sen_ip_src;
                sunion.sin.sin_port = ipa->ipa_mask.sen_sport;
                break;

#ifdef INET6
        case AF_INET6:
                sunion.sin6.sin6_addr = ipa->ipa_mask.sen_ip6_src;
                sunion.sin6.sin6_port = ipa->ipa_mask.sen_ip6_sport;
                break;
#endif /* INET6 */
        }
        export_address(&p, &sunion.sa);

        if (dir == IPSP_DIRECTION_OUT)
                headers[SADB_X_EXT_DST_FLOW] = p;
        else
                headers[SADB_X_EXT_SRC_FLOW] = p;
        switch (sunion.sa.sa_family) {
        case AF_INET:
                sunion.sin.sin_addr = ipa->ipa_info.sen_ip_dst;
                sunion.sin.sin_port = ipa->ipa_info.sen_dport;
                break;

#ifdef INET6
        case AF_INET6:
                sunion.sin6.sin6_addr = ipa->ipa_info.sen_ip6_dst;
                sunion.sin6.sin6_port = ipa->ipa_info.sen_ip6_dport;
                break;
#endif /* INET6 */
        }
        export_address(&p, &sunion.sa);

        if (dir == IPSP_DIRECTION_OUT)
                headers[SADB_X_EXT_DST_MASK] = p;
        else
                headers[SADB_X_EXT_SRC_MASK] = p;
        switch (sunion.sa.sa_family) {
        case AF_INET:
                sunion.sin.sin_addr = ipa->ipa_mask.sen_ip_dst;
                sunion.sin.sin_port = ipa->ipa_mask.sen_dport;
                break;

#ifdef INET6
        case AF_INET6:
                sunion.sin6.sin6_addr = ipa->ipa_mask.sen_ip6_dst;
                sunion.sin6.sin6_port = ipa->ipa_mask.sen_ip6_dport;
                break;
#endif /* INET6 */
        }
        export_address(&p, &sunion.sa);

        headers[SADB_X_EXT_FLOW_TYPE] = p;
        sp = p;
        sp->sadb_protocol_len = sizeof(struct sadb_protocol) /
            sizeof(u_int64_t);
        switch (sunion.sa.sa_family) {
        case AF_INET:
                if (ipa->ipa_mask.sen_proto)
                        sp->sadb_protocol_proto = ipa->ipa_info.sen_proto;
                sp->sadb_protocol_direction = ipa->ipa_info.sen_direction;
                break;

#ifdef INET6
        case AF_INET6:
                if (ipa->ipa_mask.sen_ip6_proto)
                        sp->sadb_protocol_proto = ipa->ipa_info.sen_ip6_proto;
                sp->sadb_protocol_direction = ipa->ipa_info.sen_ip6_direction;
                break;
#endif /* INET6 */
        }

        rval = 0;

ret:
        return (rval);
}

/*
 * Get all the information contained in an SA to a PFKEYV2 message.
 */
int
pfkeyv2_get(struct tdb *tdb, void **headers, void **buffer, int *lenp,
    int *lenused)
{
        int rval, i;
        void *p;

        NET_ASSERT_LOCKED();

        /* Find how much space we need */
        i = sizeof(struct sadb_sa) + sizeof(struct sadb_lifetime) +
            sizeof(struct sadb_x_counter);

        if (tdb->tdb_soft_allocations || tdb->tdb_soft_bytes ||
            tdb->tdb_soft_timeout || tdb->tdb_soft_first_use)
                i += sizeof(struct sadb_lifetime);

        if (tdb->tdb_exp_allocations || tdb->tdb_exp_bytes ||
            tdb->tdb_exp_timeout || tdb->tdb_exp_first_use)
                i += sizeof(struct sadb_lifetime);

        if (tdb->tdb_last_used)
                i += sizeof(struct sadb_lifetime);

        i += sizeof(struct sadb_address) + PADUP(tdb->tdb_src.sa.sa_len);
        i += sizeof(struct sadb_address) + PADUP(tdb->tdb_dst.sa.sa_len);

        if (tdb->tdb_ids) {
                i += sizeof(struct sadb_ident) + PADUP(tdb->tdb_ids->id_local->len);
                i += sizeof(struct sadb_ident) + PADUP(tdb->tdb_ids->id_remote->len);
        }

        if (tdb->tdb_amxkey)
                i += sizeof(struct sadb_key) + PADUP(tdb->tdb_amxkeylen);

        if (tdb->tdb_emxkey)
                i += sizeof(struct sadb_key) + PADUP(tdb->tdb_emxkeylen);

        if (tdb->tdb_filter.sen_type) {
                i += 2 * sizeof(struct sadb_protocol);

                /* We'll need four of them: src, src mask, dst, dst mask. */
                switch (tdb->tdb_filter.sen_type) {
                case SENT_IP4:
                        i += 4 * PADUP(sizeof(struct sockaddr_in));
                        i += 4 * sizeof(struct sadb_address);
                        break;
#ifdef INET6
                case SENT_IP6:
                        i += 4 * PADUP(sizeof(struct sockaddr_in6));
                        i += 4 * sizeof(struct sadb_address);
                        break;
#endif /* INET6 */
                default:
                        rval = EINVAL;
                        goto ret;
                }
        }

        if (tdb->tdb_onext) {
                i += sizeof(struct sadb_sa);
                i += sizeof(struct sadb_address) +
                    PADUP(tdb->tdb_onext->tdb_dst.sa.sa_len);
                i += sizeof(struct sadb_protocol);
        }

        if (tdb->tdb_udpencap_port)
                i += sizeof(struct sadb_x_udpencap);

        i += sizeof(struct sadb_x_replay);

        if (tdb->tdb_mtu > 0)
                i+= sizeof(struct sadb_x_mtu);

        if (tdb->tdb_rdomain != tdb->tdb_rdomain_post)
                i += sizeof(struct sadb_x_rdomain);

#if NPF > 0
        if (tdb->tdb_tag)
                i += sizeof(struct sadb_x_tag) + PADUP(PF_TAG_NAME_SIZE);
        if (tdb->tdb_tap)
                i += sizeof(struct sadb_x_tap);
#endif

        if (ISSET(tdb->tdb_flags, TDBF_IFACE))
                i += sizeof(struct sadb_x_iface);

        if (lenp)
                *lenp = i;

        if (buffer == NULL) {
                rval = 0;
                goto ret;
        }

        if (!(p = malloc(i, M_PFKEY, M_NOWAIT | M_ZERO))) {
                rval = ENOMEM;
                goto ret;
        } else
                *buffer = p;

        headers[SADB_EXT_SA] = p;

        export_sa(&p, tdb);  /* Export SA information (mostly flags) */

        /* Export lifetimes where applicable */
        headers[SADB_EXT_LIFETIME_CURRENT] = p;
        export_lifetime(&p, tdb, PFKEYV2_LIFETIME_CURRENT);

        if (tdb->tdb_soft_allocations || tdb->tdb_soft_bytes ||
            tdb->tdb_soft_first_use || tdb->tdb_soft_timeout) {
                headers[SADB_EXT_LIFETIME_SOFT] = p;
                export_lifetime(&p, tdb, PFKEYV2_LIFETIME_SOFT);
        }

        if (tdb->tdb_exp_allocations || tdb->tdb_exp_bytes ||
            tdb->tdb_exp_first_use || tdb->tdb_exp_timeout) {
                headers[SADB_EXT_LIFETIME_HARD] = p;
                export_lifetime(&p, tdb, PFKEYV2_LIFETIME_HARD);
        }

        if (tdb->tdb_last_used) {
                headers[SADB_X_EXT_LIFETIME_LASTUSE] = p;
                export_lifetime(&p, tdb, PFKEYV2_LIFETIME_LASTUSE);
        }

        /* Export TDB source address */
        headers[SADB_EXT_ADDRESS_SRC] = p;
        export_address(&p, &tdb->tdb_src.sa);

        /* Export TDB destination address */
        headers[SADB_EXT_ADDRESS_DST] = p;
        export_address(&p, &tdb->tdb_dst.sa);

        /* Export source/destination identities, if present */
        if (tdb->tdb_ids)
                export_identities(&p, tdb->tdb_ids, tdb->tdb_ids_swapped, headers);

        /* Export authentication key, if present */
        if (tdb->tdb_amxkey) {
                headers[SADB_EXT_KEY_AUTH] = p;
                export_key(&p, tdb, PFKEYV2_AUTHENTICATION_KEY);
        }

        /* Export encryption key, if present */
        if (tdb->tdb_emxkey) {
                headers[SADB_EXT_KEY_ENCRYPT] = p;
                export_key(&p, tdb, PFKEYV2_ENCRYPTION_KEY);
        }

        /* Export flow/filter, if present */
        if (tdb->tdb_filter.sen_type)
                export_flow(&p, IPSP_IPSEC_USE, &tdb->tdb_filter,
                    &tdb->tdb_filtermask, headers);

        if (tdb->tdb_onext) {
                headers[SADB_X_EXT_SA2] = p;
                export_sa(&p, tdb->tdb_onext);
                headers[SADB_X_EXT_DST2] = p;
                export_address(&p, &tdb->tdb_onext->tdb_dst.sa);
                headers[SADB_X_EXT_SATYPE2] = p;
                export_satype(&p, tdb->tdb_onext);
        }

        /* Export UDP encapsulation port, if present */
        if (tdb->tdb_udpencap_port) {
                headers[SADB_X_EXT_UDPENCAP] = p;
                export_udpencap(&p, tdb);
        }

        headers[SADB_X_EXT_REPLAY] = p;
        export_replay(&p, tdb);

        if (tdb->tdb_mtu > 0) {
                headers[SADB_X_EXT_MTU] = p;
                export_mtu(&p, tdb);
        }

        /* Export rdomain switch, if present */
        if (tdb->tdb_rdomain != tdb->tdb_rdomain_post) {
                headers[SADB_X_EXT_RDOMAIN] = p;
                export_rdomain(&p, tdb);
        }

#if NPF > 0
        /* Export tag information, if present */
        if (tdb->tdb_tag) {
                headers[SADB_X_EXT_TAG] = p;
                export_tag(&p, tdb);
        }

        /* Export tap enc(4) device information, if present */
        if (tdb->tdb_tap) {
                headers[SADB_X_EXT_TAP] = p;
                export_tap(&p, tdb);
        }
#endif

        /* Export sec(4) interface information, if present */
        if (ISSET(tdb->tdb_flags, TDBF_IFACE)) {
                headers[SADB_X_EXT_IFACE] = p;
                export_iface(&p, tdb);
        }

        headers[SADB_X_EXT_COUNTER] = p;
        export_counter(&p, tdb);

        if (lenused)
                *lenused = p - *buffer;
        rval = 0;

 ret:
        return (rval);
}

/*
 * Dump a TDB.
 */
int
pfkeyv2_dump_walker(struct tdb *tdb, void *state, int last)
{
        struct dump_state *dump_state = (struct dump_state *) state;
        void *headers[SADB_EXT_MAX+1], *buffer;
        int buflen;
        int rval;

        /* If not satype was specified, dump all TDBs */
        if (!dump_state->sadb_msg->sadb_msg_satype ||
            (tdb->tdb_satype == dump_state->sadb_msg->sadb_msg_satype)) {
                bzero(headers, sizeof(headers));
                headers[0] = (void *) dump_state->sadb_msg;

                /* Get the information from the TDB to a PFKEYv2 message */
                if ((rval = pfkeyv2_get(tdb, headers, &buffer, &buflen, NULL)) != 0)
                        return (rval);

                if (last)
                        ((struct sadb_msg *)headers[0])->sadb_msg_seq = 0;

                /* Send the message to the specified socket */
                rval = pfkeyv2_sendmessage(headers,
                    PFKEYV2_SENDMESSAGE_UNICAST, dump_state->socket, 0, 0,
                    tdb->tdb_rdomain);

                explicit_bzero(buffer, buflen);
                free(buffer, M_PFKEY, buflen);
                if (rval)
                        return (rval);
        }

        return (0);
}

/*
 * Delete an SA.
 */
int
pfkeyv2_sa_flush(struct tdb *tdb, void *satype_vp, int last)
{
        if (!(*((u_int8_t *) satype_vp)) ||
            tdb->tdb_satype == *((u_int8_t *) satype_vp))
                tdb_delete(tdb);
        return (0);
}

/*
 * Convert between SATYPEs and IPsec protocols, taking into consideration
 * sysctl variables enabling/disabling ESP/AH and the presence of the old
 * IPsec transforms.
 */
int
pfkeyv2_get_proto_alg(u_int8_t satype, u_int8_t *sproto, int *alg)
{
        switch (satype) {
#ifdef IPSEC
        case SADB_SATYPE_AH:
                if (!atomic_load_int(&ah_enable))
                        return (EOPNOTSUPP);

                *sproto = IPPROTO_AH;

                if(alg != NULL)
                        *alg = satype = XF_AH;

                break;

        case SADB_SATYPE_ESP:
                if (!atomic_load_int(&esp_enable))
                        return (EOPNOTSUPP);

                *sproto = IPPROTO_ESP;

                if(alg != NULL)
                        *alg = satype = XF_ESP;

                break;

        case SADB_X_SATYPE_IPIP:
                *sproto = IPPROTO_IPIP;

                if (alg != NULL)
                        *alg = XF_IP4;

                break;

        case SADB_X_SATYPE_IPCOMP:
                if (!atomic_load_int(&ipcomp_enable))
                        return (EOPNOTSUPP);

                *sproto = IPPROTO_IPCOMP;

                if(alg != NULL)
                        *alg = satype = XF_IPCOMP;

                break;
#endif /* IPSEC */
#ifdef TCP_SIGNATURE
        case SADB_X_SATYPE_TCPSIGNATURE:
                *sproto = IPPROTO_TCP;

                if (alg != NULL)
                        *alg = XF_TCPSIGNATURE;

                break;
#endif /* TCP_SIGNATURE */

        default: /* Nothing else supported */
                return (EOPNOTSUPP);
        }

        return (0);
}

/*
 * Handle all messages from userland to kernel.
 */
int
pfkeyv2_dosend(struct socket *so, void *message, int len)
{
        int i, j, rval = 0, mode = PFKEYV2_SENDMESSAGE_BROADCAST;
        int delflag = 0;
        struct sockaddr_encap encapdst, encapnetmask;
        struct ipsec_policy *ipo;
        struct ipsec_acquire *ipa;
        struct radix_node_head *rnh;
        struct radix_node *rn = NULL;
        struct pkpcb *kp, *bkp;
        void *freeme = NULL, *freeme2 = NULL, *freeme3 = NULL;
        int freeme_sz = 0, freeme2_sz = 0, freeme3_sz = 0;
        void *bckptr = NULL;
        void *headers[SADB_EXT_MAX + 1];
        union sockaddr_union *sunionp;
        struct tdb *sa1 = NULL, *sa2 = NULL;
        struct sadb_msg *smsg;
        struct sadb_spirange *sprng;
        struct sadb_sa *ssa;
        struct sadb_supported *ssup;
        struct sadb_ident *sid, *did;
        struct sadb_x_rdomain *srdomain;
        u_int rdomain = 0;
        int promisc;

        mtx_enter(&pfkeyv2_mtx);
        promisc = npromisc;
        mtx_leave(&pfkeyv2_mtx);

        /* Verify that we received this over a legitimate pfkeyv2 socket */
        bzero(headers, sizeof(headers));

        kp = sotokeycb(so);
        if (!kp) {
                rval = EINVAL;
                goto ret;
        }

        rdomain = kp->kcb_rdomain;

        /* Validate message format */
        if ((rval = pfkeyv2_parsemessage(message, len, headers)) != 0)
                goto ret;

        /* If we have any promiscuous listeners, send them a copy of the message */
        if (promisc) {
                struct mbuf *packet;

                freeme_sz = sizeof(struct sadb_msg) + len;
                if (!(freeme = malloc(freeme_sz, M_PFKEY, M_NOWAIT))) {
                        rval = ENOMEM;
                        goto ret;
                }

                /* Initialize encapsulating header */
                bzero(freeme, sizeof(struct sadb_msg));
                smsg = (struct sadb_msg *) freeme;
                smsg->sadb_msg_version = PF_KEY_V2;
                smsg->sadb_msg_type = SADB_X_PROMISC;
                smsg->sadb_msg_len = (sizeof(struct sadb_msg) + len) /
                    sizeof(uint64_t);
                smsg->sadb_msg_seq = curproc->p_p->ps_pid;

                bcopy(message, freeme + sizeof(struct sadb_msg), len);

                /* Convert to mbuf chain */
                if ((rval = pfdatatopacket(freeme, freeme_sz, &packet)) != 0)
                        goto ret;

                /* Send to all promiscuous listeners */
                rw_enter_read(&pkptable.pkp_lk);
                TAILQ_FOREACH(bkp, &pkptable.pkp_list, kcb_list) {
                        if (bkp->kcb_rdomain != kp->kcb_rdomain)
                                continue;

                        if (bkp->kcb_flags & PFKEYV2_SOCKETFLAGS_PROMISC)
                                pfkey_sendup(bkp, packet, 1);
                }
                rw_exit_read(&pkptable.pkp_lk);

                m_freem(packet);

                /* Paranoid */
                explicit_bzero(freeme, freeme_sz);
                free(freeme, M_PFKEY, freeme_sz);
                freeme = NULL;
                freeme_sz = 0;
        }

        /* use specified rdomain */
        srdomain = (struct sadb_x_rdomain *) headers[SADB_X_EXT_RDOMAIN];
        if (srdomain) {
                if (!rtable_exists(srdomain->sadb_x_rdomain_dom1) ||
                    !rtable_exists(srdomain->sadb_x_rdomain_dom2)) {
                        rval = EINVAL;
                        goto ret;
                }
                rdomain = srdomain->sadb_x_rdomain_dom1;
        }

        smsg = (struct sadb_msg *) headers[0];
        switch (smsg->sadb_msg_type) {
        case SADB_GETSPI:  /* Reserve an SPI */
                sa1 = malloc(sizeof (*sa1), M_PFKEY, M_NOWAIT | M_ZERO);
                if (sa1 == NULL) {
                        rval = ENOMEM;
                        goto ret;
                }

                sa1->tdb_satype = smsg->sadb_msg_satype;
                if ((rval = pfkeyv2_get_proto_alg(sa1->tdb_satype,
                    &sa1->tdb_sproto, 0)))
                        goto ret;

                import_address(&sa1->tdb_src.sa, headers[SADB_EXT_ADDRESS_SRC]);
                import_address(&sa1->tdb_dst.sa, headers[SADB_EXT_ADDRESS_DST]);

                /* Find an unused SA identifier */
                sprng = (struct sadb_spirange *) headers[SADB_EXT_SPIRANGE];
                NET_LOCK();
                sa1->tdb_spi = reserve_spi(rdomain,
                    sprng->sadb_spirange_min, sprng->sadb_spirange_max,
                    &sa1->tdb_src, &sa1->tdb_dst, sa1->tdb_sproto, &rval);
                if (sa1->tdb_spi == 0) {
                        NET_UNLOCK();
                        goto ret;
                }

                /* Send a message back telling what the SA (the SPI really) is */
                freeme_sz = sizeof(struct sadb_sa);
                if (!(freeme = malloc(freeme_sz, M_PFKEY, M_NOWAIT | M_ZERO))) {
                        rval = ENOMEM;
                        NET_UNLOCK();
                        goto ret;
                }

                headers[SADB_EXT_SPIRANGE] = NULL;
                headers[SADB_EXT_SA] = freeme;
                bckptr = freeme;

                /* We really only care about the SPI, but we'll export the SA */
                export_sa((void **) &bckptr, sa1);
                NET_UNLOCK();
                break;

        case SADB_UPDATE:
                ssa = (struct sadb_sa *) headers[SADB_EXT_SA];
                sunionp = (union sockaddr_union *) (headers[SADB_EXT_ADDRESS_DST] +
                    sizeof(struct sadb_address));

                /* Either all or none of the flow must be included */
                if ((headers[SADB_X_EXT_SRC_FLOW] ||
                    headers[SADB_X_EXT_PROTOCOL] ||
                    headers[SADB_X_EXT_FLOW_TYPE] ||
                    headers[SADB_X_EXT_DST_FLOW] ||
                    headers[SADB_X_EXT_SRC_MASK] ||
                    headers[SADB_X_EXT_DST_MASK]) &&
                    !(headers[SADB_X_EXT_SRC_FLOW] &&
                    headers[SADB_X_EXT_PROTOCOL] &&
                    headers[SADB_X_EXT_FLOW_TYPE] &&
                    headers[SADB_X_EXT_DST_FLOW] &&
                    headers[SADB_X_EXT_SRC_MASK] &&
                    headers[SADB_X_EXT_DST_MASK])) {
                        rval = EINVAL;
                        goto ret;
                }
#ifdef IPSEC
                /* UDP encap has to be enabled and is only supported for ESP */
                if (headers[SADB_X_EXT_UDPENCAP] &&
                    (!atomic_load_int(&udpencap_enable) ||
                    smsg->sadb_msg_satype != SADB_SATYPE_ESP)) {
                        rval = EINVAL;
                        goto ret;
                }
#endif /* IPSEC */

                /* Find TDB */
                NET_LOCK();
                sa2 = gettdb(rdomain, ssa->sadb_sa_spi, sunionp,
                    SADB_X_GETSPROTO(smsg->sadb_msg_satype));

                /* If there's no such SA, we're done */
                if (sa2 == NULL) {
                        rval = ESRCH;
                        NET_UNLOCK();
                        goto ret;
                }

                /* If this is a reserved SA */
                if (sa2->tdb_flags & TDBF_INVALID) {
                        struct tdb *newsa;
                        struct ipsecinit ii;
                        int alg;

                        /* Create new TDB */
                        newsa = tdb_alloc(rdomain);
                        newsa->tdb_satype = smsg->sadb_msg_satype;

                        if ((rval = pfkeyv2_get_proto_alg(newsa->tdb_satype,
                            &newsa->tdb_sproto, &alg))) {
                                tdb_unref(newsa);
                                NET_UNLOCK();
                                goto ret;
                        }

                        /* Initialize SA */
                        bzero(&ii, sizeof(struct ipsecinit));
                        import_sa(newsa, headers[SADB_EXT_SA], &ii);
                        import_address(&newsa->tdb_src.sa,
                            headers[SADB_EXT_ADDRESS_SRC]);
                        import_address(&newsa->tdb_dst.sa,
                            headers[SADB_EXT_ADDRESS_DST]);
                        import_lifetime(newsa,
                            headers[SADB_EXT_LIFETIME_CURRENT],
                            PFKEYV2_LIFETIME_CURRENT);
                        import_lifetime(newsa, headers[SADB_EXT_LIFETIME_SOFT],
                            PFKEYV2_LIFETIME_SOFT);
                        import_lifetime(newsa, headers[SADB_EXT_LIFETIME_HARD],
                            PFKEYV2_LIFETIME_HARD);
                        import_key(&ii, headers[SADB_EXT_KEY_AUTH],
                            PFKEYV2_AUTHENTICATION_KEY);
                        import_key(&ii, headers[SADB_EXT_KEY_ENCRYPT],
                            PFKEYV2_ENCRYPTION_KEY);
                        newsa->tdb_ids_swapped = 1; /* only on TDB_UPDATE */
                        import_identities(&newsa->tdb_ids,
                            newsa->tdb_ids_swapped,
                            headers[SADB_EXT_IDENTITY_SRC],
                            headers[SADB_EXT_IDENTITY_DST]);
                        if ((rval = import_flow(&newsa->tdb_filter,
                            &newsa->tdb_filtermask,
                            headers[SADB_X_EXT_SRC_FLOW],
                            headers[SADB_X_EXT_SRC_MASK],
                            headers[SADB_X_EXT_DST_FLOW],
                            headers[SADB_X_EXT_DST_MASK],
                            headers[SADB_X_EXT_PROTOCOL],
                            headers[SADB_X_EXT_FLOW_TYPE]))) {
                                tdb_unref(newsa);
                                NET_UNLOCK();
                                goto ret;
                        }
                        import_udpencap(newsa, headers[SADB_X_EXT_UDPENCAP]);
                        import_rdomain(newsa, headers[SADB_X_EXT_RDOMAIN]);
#if NPF > 0
                        import_tag(newsa, headers[SADB_X_EXT_TAG]);
                        import_tap(newsa, headers[SADB_X_EXT_TAP]);
#endif
                        import_iface(newsa, headers[SADB_X_EXT_IFACE]);

                        /* Exclude sensitive data from reply message. */
                        headers[SADB_EXT_KEY_AUTH] = NULL;
                        headers[SADB_EXT_KEY_ENCRYPT] = NULL;
                        headers[SADB_X_EXT_LOCAL_AUTH] = NULL;
                        headers[SADB_X_EXT_REMOTE_AUTH] = NULL;

                        newsa->tdb_seq = smsg->sadb_msg_seq;

                        rval = tdb_init(newsa, alg, &ii);
                        if (rval) {
                                rval = EINVAL;
                                tdb_unref(newsa);
                                NET_UNLOCK();
                                goto ret;
                        }

                        newsa->tdb_cur_allocations = sa2->tdb_cur_allocations;

                        /* Delete old version of the SA, insert new one */
                        tdb_delete(sa2);

                        tdb_addtimeouts(newsa);

                        puttdb(newsa);
                } else {
                        /*
                         * The SA is already initialized, so we're only allowed to
                         * change lifetimes and some other information; we're
                         * not allowed to change keys, addresses or identities.
                         */
                        if (headers[SADB_EXT_KEY_AUTH] ||
                            headers[SADB_EXT_KEY_ENCRYPT] ||
                            headers[SADB_EXT_IDENTITY_SRC] ||
                            headers[SADB_EXT_IDENTITY_DST] ||
                            headers[SADB_EXT_SENSITIVITY]) {
                                rval = EINVAL;
                                NET_UNLOCK();
                                goto ret;
                        }

                        import_sa(sa2, headers[SADB_EXT_SA], NULL);
                        import_lifetime(sa2,
                            headers[SADB_EXT_LIFETIME_CURRENT],
                            PFKEYV2_LIFETIME_CURRENT);
                        import_lifetime(sa2, headers[SADB_EXT_LIFETIME_SOFT],
                            PFKEYV2_LIFETIME_SOFT);
                        import_lifetime(sa2, headers[SADB_EXT_LIFETIME_HARD],
                            PFKEYV2_LIFETIME_HARD);
                        import_udpencap(sa2, headers[SADB_X_EXT_UDPENCAP]);
#if NPF > 0
                        import_tag(sa2, headers[SADB_X_EXT_TAG]);
                        import_tap(sa2, headers[SADB_X_EXT_TAP]);
#endif
                        import_iface(sa2, headers[SADB_X_EXT_IFACE]);

                        tdb_addtimeouts(sa2);

                        if (headers[SADB_EXT_ADDRESS_SRC] ||
                            headers[SADB_EXT_ADDRESS_PROXY]) {
                                mtx_enter(&tdb_sadb_mtx);
                                tdb_unlink_locked(sa2);
                                import_address((struct sockaddr *)&sa2->tdb_src,
                                    headers[SADB_EXT_ADDRESS_SRC]);
                                import_address((struct sockaddr *)&sa2->tdb_dst,
                                    headers[SADB_EXT_ADDRESS_PROXY]);
                                puttdb_locked(sa2);
                                mtx_leave(&tdb_sadb_mtx);
                        }
                }
                NET_UNLOCK();

                break;
        case SADB_ADD:
                ssa = (struct sadb_sa *) headers[SADB_EXT_SA];
                sunionp = (union sockaddr_union *) (headers[SADB_EXT_ADDRESS_DST] +
                    sizeof(struct sadb_address));

                /* Either all or none of the flow must be included */
                if ((headers[SADB_X_EXT_SRC_FLOW] ||
                    headers[SADB_X_EXT_PROTOCOL] ||
                    headers[SADB_X_EXT_FLOW_TYPE] ||
                    headers[SADB_X_EXT_DST_FLOW] ||
                    headers[SADB_X_EXT_SRC_MASK] ||
                    headers[SADB_X_EXT_DST_MASK]) &&
                    !(headers[SADB_X_EXT_SRC_FLOW] &&
                    headers[SADB_X_EXT_PROTOCOL] &&
                    headers[SADB_X_EXT_FLOW_TYPE] &&
                    headers[SADB_X_EXT_DST_FLOW] &&
                    headers[SADB_X_EXT_SRC_MASK] &&
                    headers[SADB_X_EXT_DST_MASK])) {
                        rval = EINVAL;
                        goto ret;
                }
#ifdef IPSEC
                /* UDP encap has to be enabled and is only supported for ESP */
                if (headers[SADB_X_EXT_UDPENCAP] &&
                    (!atomic_load_int(&udpencap_enable) ||
                    smsg->sadb_msg_satype != SADB_SATYPE_ESP)) {
                        rval = EINVAL;
                        goto ret;
                }
#endif /* IPSEC */

                NET_LOCK();
                sa2 = gettdb(rdomain, ssa->sadb_sa_spi, sunionp,
                    SADB_X_GETSPROTO(smsg->sadb_msg_satype));

                /* We can't add an existing SA! */
                if (sa2 != NULL) {
                        rval = EEXIST;
                        NET_UNLOCK();
                        goto ret;
                }

                /* We can only add "mature" SAs */
                if (ssa->sadb_sa_state != SADB_SASTATE_MATURE) {
                        rval = EINVAL;
                        NET_UNLOCK();
                        goto ret;
                }

                {
                        struct tdb *newsa;
                        struct ipsecinit ii;
                        int alg;

                        /* Create new TDB */
                        newsa = tdb_alloc(rdomain);
                        newsa->tdb_satype = smsg->sadb_msg_satype;

                        if ((rval = pfkeyv2_get_proto_alg(newsa->tdb_satype,
                            &newsa->tdb_sproto, &alg))) {
                                tdb_unref(newsa);
                                NET_UNLOCK();
                                goto ret;
                        }

                        /* Initialize SA */
                        bzero(&ii, sizeof(struct ipsecinit));
                        import_sa(newsa, headers[SADB_EXT_SA], &ii);
                        import_address(&newsa->tdb_src.sa,
                            headers[SADB_EXT_ADDRESS_SRC]);
                        import_address(&newsa->tdb_dst.sa,
                            headers[SADB_EXT_ADDRESS_DST]);

                        import_lifetime(newsa,
                            headers[SADB_EXT_LIFETIME_CURRENT],
                            PFKEYV2_LIFETIME_CURRENT);
                        import_lifetime(newsa, headers[SADB_EXT_LIFETIME_SOFT],
                            PFKEYV2_LIFETIME_SOFT);
                        import_lifetime(newsa, headers[SADB_EXT_LIFETIME_HARD],
                            PFKEYV2_LIFETIME_HARD);

                        import_key(&ii, headers[SADB_EXT_KEY_AUTH],
                            PFKEYV2_AUTHENTICATION_KEY);
                        import_key(&ii, headers[SADB_EXT_KEY_ENCRYPT],
                            PFKEYV2_ENCRYPTION_KEY);

                        import_identities(&newsa->tdb_ids,
                            newsa->tdb_ids_swapped,
                            headers[SADB_EXT_IDENTITY_SRC],
                            headers[SADB_EXT_IDENTITY_DST]);

                        if ((rval = import_flow(&newsa->tdb_filter,
                            &newsa->tdb_filtermask,
                            headers[SADB_X_EXT_SRC_FLOW],
                            headers[SADB_X_EXT_SRC_MASK],
                            headers[SADB_X_EXT_DST_FLOW],
                            headers[SADB_X_EXT_DST_MASK],
                            headers[SADB_X_EXT_PROTOCOL],
                            headers[SADB_X_EXT_FLOW_TYPE]))) {
                                tdb_unref(newsa);
                                NET_UNLOCK();
                                goto ret;
                        }
                        import_udpencap(newsa, headers[SADB_X_EXT_UDPENCAP]);
                        import_rdomain(newsa, headers[SADB_X_EXT_RDOMAIN]);
#if NPF > 0
                        import_tag(newsa, headers[SADB_X_EXT_TAG]);
                        import_tap(newsa, headers[SADB_X_EXT_TAP]);
#endif
                        import_iface(newsa, headers[SADB_X_EXT_IFACE]);

                        /* Exclude sensitive data from reply message. */
                        headers[SADB_EXT_KEY_AUTH] = NULL;
                        headers[SADB_EXT_KEY_ENCRYPT] = NULL;
                        headers[SADB_X_EXT_LOCAL_AUTH] = NULL;
                        headers[SADB_X_EXT_REMOTE_AUTH] = NULL;

                        newsa->tdb_seq = smsg->sadb_msg_seq;

                        rval = tdb_init(newsa, alg, &ii);
                        if (rval) {
                                rval = EINVAL;
                                tdb_unref(newsa);
                                NET_UNLOCK();
                                goto ret;
                        }

                        tdb_addtimeouts(newsa);

                        /* Add TDB in table */
                        puttdb(newsa);
                }
                NET_UNLOCK();

                break;

        case SADB_DELETE:
                ssa = (struct sadb_sa *) headers[SADB_EXT_SA];
                sunionp =
                    (union sockaddr_union *)(headers[SADB_EXT_ADDRESS_DST] +
                        sizeof(struct sadb_address));

                NET_LOCK();
                sa2 = gettdb(rdomain, ssa->sadb_sa_spi, sunionp,
                    SADB_X_GETSPROTO(smsg->sadb_msg_satype));
                if (sa2 == NULL) {
                        rval = ESRCH;
                        NET_UNLOCK();
                        goto ret;
                }

                tdb_delete(sa2);
                NET_UNLOCK();

                break;

        case SADB_X_ASKPOLICY:
                /* Get the relevant policy */
                NET_LOCK();
                ipa = ipsec_get_acquire(((struct sadb_x_policy *)
                    headers[SADB_X_EXT_POLICY])->sadb_x_policy_seq);
                if (ipa == NULL) {
                        rval = ESRCH;
                        NET_UNLOCK();
                        goto ret;
                }

                rval = pfkeyv2_policy(ipa, headers, &freeme, &freeme_sz);
                NET_UNLOCK();
                ipsec_unref_acquire(ipa);
                if (rval)
                        mode = PFKEYV2_SENDMESSAGE_UNICAST;

                break;

        case SADB_GET:
                ssa = (struct sadb_sa *) headers[SADB_EXT_SA];
                sunionp =
                    (union sockaddr_union *)(headers[SADB_EXT_ADDRESS_DST] +
                        sizeof(struct sadb_address));

                NET_LOCK();
                sa2 = gettdb(rdomain, ssa->sadb_sa_spi, sunionp,
                    SADB_X_GETSPROTO(smsg->sadb_msg_satype));
                if (sa2 == NULL) {
                        rval = ESRCH;
                        NET_UNLOCK();
                        goto ret;
                }

                rval = pfkeyv2_get(sa2, headers, &freeme, &freeme_sz, NULL);
                NET_UNLOCK();
                if (rval)
                        mode = PFKEYV2_SENDMESSAGE_UNICAST;

                break;

        case SADB_REGISTER:
                keylock(kp);
                if (!(kp->kcb_flags & PFKEYV2_SOCKETFLAGS_REGISTERED)) {
                        kp->kcb_flags |= PFKEYV2_SOCKETFLAGS_REGISTERED;
                        mtx_enter(&pfkeyv2_mtx);
                        nregistered++;
                        mtx_leave(&pfkeyv2_mtx);
                }
                keyunlock(kp);

                freeme_sz = sizeof(struct sadb_supported) + sizeof(ealgs);
                if (!(freeme = malloc(freeme_sz, M_PFKEY, M_NOWAIT | M_ZERO))) {
                        rval = ENOMEM;
                        goto ret;
                }

                ssup = (struct sadb_supported *) freeme;
                ssup->sadb_supported_len = freeme_sz / sizeof(uint64_t);

                {
                        void *p = freeme + sizeof(struct sadb_supported);

                        bcopy(&ealgs[0], p, sizeof(ealgs));
                }

                headers[SADB_EXT_SUPPORTED_ENCRYPT] = freeme;

                freeme2_sz = sizeof(struct sadb_supported) + sizeof(aalgs);
                if (!(freeme2 = malloc(freeme2_sz, M_PFKEY,
                    M_NOWAIT | M_ZERO))) {
                        rval = ENOMEM;
                        goto ret;
                }

                /* Keep track what this socket has registered for */
                keylock(kp);
                kp->kcb_reg |=
                    (1 << ((struct sadb_msg *)message)->sadb_msg_satype);
                keyunlock(kp);

                ssup = (struct sadb_supported *) freeme2;
                ssup->sadb_supported_len = freeme2_sz / sizeof(uint64_t);

                {
                        void *p = freeme2 + sizeof(struct sadb_supported);

                        bcopy(&aalgs[0], p, sizeof(aalgs));
                }

                headers[SADB_EXT_SUPPORTED_AUTH] = freeme2;

                freeme3_sz = sizeof(struct sadb_supported) + sizeof(calgs);
                if (!(freeme3 = malloc(freeme3_sz, M_PFKEY,
                    M_NOWAIT | M_ZERO))) {
                        rval = ENOMEM;
                        goto ret;
                }

                ssup = (struct sadb_supported *) freeme3;
                ssup->sadb_supported_len = freeme3_sz / sizeof(uint64_t);

                {
                        void *p = freeme3 + sizeof(struct sadb_supported);

                        bcopy(&calgs[0], p, sizeof(calgs));
                }

                headers[SADB_X_EXT_SUPPORTED_COMP] = freeme3;

                break;

        case SADB_ACQUIRE:
        case SADB_EXPIRE:
                /* Nothing to handle */
                rval = 0;
                break;

        case SADB_FLUSH:
                rval = 0;

                NET_LOCK();
                switch (smsg->sadb_msg_satype) {
                case SADB_SATYPE_UNSPEC:
                        spd_table_walk(rdomain, pfkeyv2_policy_flush, NULL);
                        /* FALLTHROUGH */
                case SADB_SATYPE_AH:
                case SADB_SATYPE_ESP:
                case SADB_X_SATYPE_IPIP:
                case SADB_X_SATYPE_IPCOMP:
#ifdef TCP_SIGNATURE
                case SADB_X_SATYPE_TCPSIGNATURE:
#endif /* TCP_SIGNATURE */
                        tdb_walk(rdomain, pfkeyv2_sa_flush,
                            (u_int8_t *) &(smsg->sadb_msg_satype));

                        break;

                default:
                        rval = EINVAL; /* Unknown/unsupported type */
                }
                NET_UNLOCK();

                break;

        case SADB_DUMP:
        {
                struct dump_state dump_state;
                dump_state.sadb_msg = (struct sadb_msg *) headers[0];
                dump_state.socket = so;

                NET_LOCK();
                rval = tdb_walk(rdomain, pfkeyv2_dump_walker, &dump_state);
                NET_UNLOCK();
                if (!rval)
                        goto realret;
                if ((rval == ENOMEM) || (rval == ENOBUFS))
                        rval = 0;
        }
        break;

        case SADB_X_GRPSPIS:
        {
                struct tdb *tdb1, *tdb2, *tdb3;
                struct sadb_protocol *sa_proto;

                ssa = (struct sadb_sa *) headers[SADB_EXT_SA];
                sunionp = (union sockaddr_union *) (headers[SADB_EXT_ADDRESS_DST] +
                    sizeof(struct sadb_address));

                NET_LOCK();
                tdb1 = gettdb(rdomain, ssa->sadb_sa_spi, sunionp,
                    SADB_X_GETSPROTO(smsg->sadb_msg_satype));
                if (tdb1 == NULL) {
                        rval = ESRCH;
                        NET_UNLOCK();
                        goto ret;
                }

                ssa = (struct sadb_sa *) headers[SADB_X_EXT_SA2];
                sunionp = (union sockaddr_union *) (headers[SADB_X_EXT_DST2] +
                    sizeof(struct sadb_address));
                sa_proto = (struct sadb_protocol *) headers[SADB_X_EXT_SATYPE2];

                /* optionally fetch tdb2 from rdomain2 */
                tdb2 = gettdb(srdomain ? srdomain->sadb_x_rdomain_dom2 : rdomain,
                    ssa->sadb_sa_spi, sunionp,
                    SADB_X_GETSPROTO(sa_proto->sadb_protocol_proto));
                if (tdb2 == NULL) {
                        tdb_unref(tdb1);
                        rval = ESRCH;
                        NET_UNLOCK();
                        goto ret;
                }

                /* Detect cycles */
                for (tdb3 = tdb2; tdb3; tdb3 = tdb3->tdb_onext)
                        if (tdb3 == tdb1) {
                                tdb_unref(tdb1);
                                tdb_unref(tdb2);
                                rval = ESRCH;
                                NET_UNLOCK();
                                goto ret;
                        }

                /* Maintenance */
                if ((tdb1->tdb_onext) &&
                    (tdb1->tdb_onext->tdb_inext == tdb1)) {
                        tdb_unref(tdb1->tdb_onext->tdb_inext);
                        tdb1->tdb_onext->tdb_inext = NULL;
                }

                if ((tdb2->tdb_inext) &&
                    (tdb2->tdb_inext->tdb_onext == tdb2)) {
                        tdb_unref(tdb2->tdb_inext->tdb_onext);
                        tdb2->tdb_inext->tdb_onext = NULL;
                }

                /* Link them */
                tdb1->tdb_onext = tdb2;
                tdb2->tdb_inext = tdb1;
                NET_UNLOCK();
        }
        break;

        case SADB_X_DELFLOW:
                delflag = 1;
                /*FALLTHROUGH*/
        case SADB_X_ADDFLOW:
        {
                struct sadb_protocol *sab;
                union sockaddr_union *ssrc;
                int exists = 0;

                NET_LOCK();
                if ((rnh = spd_table_add(rdomain)) == NULL) {
                        rval = ENOMEM;
                        NET_UNLOCK();
                        goto ret;
                }

                sab = (struct sadb_protocol *) headers[SADB_X_EXT_FLOW_TYPE];

                if ((sab->sadb_protocol_direction != IPSP_DIRECTION_IN) &&
                    (sab->sadb_protocol_direction != IPSP_DIRECTION_OUT)) {
                        rval = EINVAL;
                        NET_UNLOCK();
                        goto ret;
                }

                /* If the security protocol wasn't specified, pretend it was ESP */
                if (smsg->sadb_msg_satype == 0)
                        smsg->sadb_msg_satype = SADB_SATYPE_ESP;

                if (headers[SADB_EXT_ADDRESS_DST])
                        sunionp = (union sockaddr_union *)
                            (headers[SADB_EXT_ADDRESS_DST] +
                                sizeof(struct sadb_address));
                else
                        sunionp = NULL;

                if (headers[SADB_EXT_ADDRESS_SRC])
                        ssrc = (union sockaddr_union *)
                            (headers[SADB_EXT_ADDRESS_SRC] +
                                sizeof(struct sadb_address));
                else
                        ssrc = NULL;

                if ((rval = import_flow(&encapdst, &encapnetmask,
                    headers[SADB_X_EXT_SRC_FLOW], headers[SADB_X_EXT_SRC_MASK],
                    headers[SADB_X_EXT_DST_FLOW], headers[SADB_X_EXT_DST_MASK],
                    headers[SADB_X_EXT_PROTOCOL],
                    headers[SADB_X_EXT_FLOW_TYPE]))) {
                        NET_UNLOCK();
                        goto ret;
                }

                /* Determine whether the exact same SPD entry already exists. */
                if ((rn = rn_match(&encapdst, rnh)) != NULL) {
                        ipo = (struct ipsec_policy *)rn;

                        /* Verify that the entry is identical */
                        if (bcmp(&ipo->ipo_addr, &encapdst,
                                sizeof(struct sockaddr_encap)) ||
                            bcmp(&ipo->ipo_mask, &encapnetmask,
                                sizeof(struct sockaddr_encap)))
                                ipo = NULL; /* Fall through */
                        else
                                exists = 1;
                } else
                        ipo = NULL;

                /*
                 * If the existing policy is static, only delete or update
                 * it if the new one is also static.
                 */
                if (exists && (ipo->ipo_flags & IPSP_POLICY_STATIC)) {
                        if (!(sab->sadb_protocol_flags &
                                SADB_X_POLICYFLAGS_POLICY)) {
                                NET_UNLOCK();
                                goto ret;
                        }
                }

                /* Delete ? */
                if (delflag) {
                        if (exists) {
                                rval = ipsec_delete_policy(ipo);
                                NET_UNLOCK();
                                goto ret;
                        }

                        /* If we were asked to delete something non-existent, error. */
                        rval = ESRCH;
                        NET_UNLOCK();
                        break;
                }

                if (!exists) {
                        /* Allocate policy entry */
                        ipo = pool_get(&ipsec_policy_pool, PR_NOWAIT|PR_ZERO);
                        if (ipo == NULL) {
                                rval = ENOMEM;
                                NET_UNLOCK();
                                goto ret;
                        }
                }

                switch (sab->sadb_protocol_proto) {
                case SADB_X_FLOW_TYPE_USE:
                        ipo->ipo_type = IPSP_IPSEC_USE;
                        break;

                case SADB_X_FLOW_TYPE_ACQUIRE:
                        ipo->ipo_type = IPSP_IPSEC_ACQUIRE;
                        break;

                case SADB_X_FLOW_TYPE_REQUIRE:
                        ipo->ipo_type = IPSP_IPSEC_REQUIRE;
                        break;

                case SADB_X_FLOW_TYPE_DENY:
                        ipo->ipo_type = IPSP_DENY;
                        break;

                case SADB_X_FLOW_TYPE_BYPASS:
                        ipo->ipo_type = IPSP_PERMIT;
                        break;

                case SADB_X_FLOW_TYPE_DONTACQ:
                        ipo->ipo_type = IPSP_IPSEC_DONTACQ;
                        break;

                default:
                        if (!exists)
                                pool_put(&ipsec_policy_pool, ipo);
                        else
                                ipsec_delete_policy(ipo);

                        rval = EINVAL;
                        NET_UNLOCK();
                        goto ret;
                }

                if (sab->sadb_protocol_flags & SADB_X_POLICYFLAGS_POLICY)
                        ipo->ipo_flags |= IPSP_POLICY_STATIC;

                if (sunionp)
                        bcopy(sunionp, &ipo->ipo_dst,
                            sizeof(union sockaddr_union));
                else
                        bzero(&ipo->ipo_dst, sizeof(union sockaddr_union));

                if (ssrc)
                        bcopy(ssrc, &ipo->ipo_src,
                            sizeof(union sockaddr_union));
                else
                        bzero(&ipo->ipo_src, sizeof(union sockaddr_union));

                ipo->ipo_sproto = SADB_X_GETSPROTO(smsg->sadb_msg_satype);

                if (ipo->ipo_ids) {
                        ipsp_ids_free(ipo->ipo_ids);
                        ipo->ipo_ids = NULL;
                }

                if ((sid = headers[SADB_EXT_IDENTITY_SRC]) != NULL &&
                    (did = headers[SADB_EXT_IDENTITY_DST]) != NULL) {
                        import_identities(&ipo->ipo_ids, 0, sid, did);
                        if (ipo->ipo_ids == NULL) {
                                if (exists)
                                        ipsec_delete_policy(ipo);
                                else
                                        pool_put(&ipsec_policy_pool, ipo);
                                rval = ENOBUFS;
                                NET_UNLOCK();
                                goto ret;
                        }
                }

                /* Flow type */
                if (!exists) {
                        /* Initialize policy entry */
                        bcopy(&encapdst, &ipo->ipo_addr,
                            sizeof(struct sockaddr_encap));
                        bcopy(&encapnetmask, &ipo->ipo_mask,
                            sizeof(struct sockaddr_encap));

                        TAILQ_INIT(&ipo->ipo_acquires);
                        ipo->ipo_rdomain = rdomain;
                        refcnt_init(&ipo->ipo_refcnt);

                        /* Add SPD entry */
                        if ((rnh = spd_table_get(rdomain)) == NULL ||
                            (rn = rn_addroute((caddr_t)&ipo->ipo_addr,
                                (caddr_t)&ipo->ipo_mask, rnh,
                                ipo->ipo_nodes, 0)) == NULL) {
                                /* Remove from linked list of policies on TDB */
                                mtx_enter(&ipo_tdb_mtx);
                                if (ipo->ipo_tdb != NULL) {
                                        TAILQ_REMOVE(
                                            &ipo->ipo_tdb->tdb_policy_head,
                                            ipo, ipo_tdb_next);
                                        tdb_unref(ipo->ipo_tdb);
                                        ipo->ipo_tdb = NULL;
                                }
                                mtx_leave(&ipo_tdb_mtx);
                                if (ipo->ipo_ids)
                                        ipsp_ids_free(ipo->ipo_ids);
                                pool_put(&ipsec_policy_pool, ipo);
                                NET_UNLOCK();
                                goto ret;
                        }
                        TAILQ_INSERT_HEAD(&ipsec_policy_head, ipo, ipo_list);
                        ipsec_in_use++;
                } else {
                        ipo->ipo_last_searched = ipo->ipo_flags = 0;
                }
                NET_UNLOCK();
        }
        break;

        case SADB_X_PROMISC:
                if (len >= 2 * sizeof(struct sadb_msg)) {
                        struct mbuf *packet;

                        if ((rval = pfdatatopacket(message, len, &packet)) != 0)
                                goto ret;

                        rw_enter_read(&pkptable.pkp_lk);
                        TAILQ_FOREACH(bkp, &pkptable.pkp_list, kcb_list) {
                                if (bkp == kp ||
                                    bkp->kcb_rdomain != kp->kcb_rdomain)
                                        continue;

                                if (!smsg->sadb_msg_seq ||
                                    (smsg->sadb_msg_seq == kp->kcb_pid)) {
                                        pfkey_sendup(bkp, packet, 1);
                                }
                        }
                        rw_exit_read(&pkptable.pkp_lk);

                        m_freem(packet);
                } else {
                        if (len != sizeof(struct sadb_msg)) {
                                rval = EINVAL;
                                goto ret;
                        }

                        keylock(kp);
                        i = (kp->kcb_flags &
                            PFKEYV2_SOCKETFLAGS_PROMISC) ? 1 : 0;
                        j = smsg->sadb_msg_satype ? 1 : 0;

                        if (i ^ j) {
                                if (j) {
                                        kp->kcb_flags |=
                                            PFKEYV2_SOCKETFLAGS_PROMISC;
                                        mtx_enter(&pfkeyv2_mtx);
                                        npromisc++;
                                        mtx_leave(&pfkeyv2_mtx);
                                } else {
                                        kp->kcb_flags &=
                                            ~PFKEYV2_SOCKETFLAGS_PROMISC;
                                        mtx_enter(&pfkeyv2_mtx);
                                        npromisc--;
                                        mtx_leave(&pfkeyv2_mtx);
                                }
                        }
                        keyunlock(kp);
                }

                break;

        default:
                rval = EINVAL;
                goto ret;
        }

ret:
        if (rval) {
                if ((rval == EINVAL) || (rval == ENOMEM) || (rval == ENOBUFS))
                        goto realret;

                for (i = 1; i <= SADB_EXT_MAX; i++)
                        headers[i] = NULL;

                smsg->sadb_msg_errno = abs(rval);
        } else {
                uint64_t seen = 0LL;

                for (i = 1; i <= SADB_EXT_MAX; i++)
                        if (headers[i])
                                seen |= (1LL << i);

                if ((seen & sadb_exts_allowed_out[smsg->sadb_msg_type])
                    != seen) {
                        rval = EPERM;
                        goto realret;
                }

                if ((seen & sadb_exts_required_out[smsg->sadb_msg_type]) !=
                    sadb_exts_required_out[smsg->sadb_msg_type]) {
                        rval = EPERM;
                        goto realret;
                }
        }

        rval = pfkeyv2_sendmessage(headers, mode, so, 0, 0, kp->kcb_rdomain);

realret:

        if (freeme != NULL)
                explicit_bzero(freeme, freeme_sz);
        free(freeme, M_PFKEY, freeme_sz);
        free(freeme2, M_PFKEY, freeme2_sz);
        free(freeme3, M_PFKEY, freeme3_sz);

        explicit_bzero(message, len);
        free(message, M_PFKEY, len);

        free(sa1, M_PFKEY, sizeof(*sa1));

        NET_LOCK();
        tdb_unref(sa2);
        NET_UNLOCK();

        return (rval);
}

/*
 * Send an ACQUIRE message to key management, to get a new SA.
 */
int
pfkeyv2_acquire(struct ipsec_policy *ipo, union sockaddr_union *gw,
    union sockaddr_union *laddr, u_int32_t *seq, struct sockaddr_encap *ddst)
{
        void *p, *headers[SADB_EXT_MAX + 1], *buffer = NULL;
        struct sadb_comb *sadb_comb;
        struct sadb_address *sadd;
        struct sadb_prop *sa_prop;
        struct sadb_msg *smsg;
        int rval = 0;
        int i, j, registered;

#ifdef IPSEC
        int require_pfs_local;
        int def_enc_local, def_comp_local, def_auth_local;
        int soft_allocations_local, exp_allocations_local;
        int soft_bytes_local, exp_bytes_local;
        int soft_timeout_local, exp_timeout_local;
        int soft_first_use_local, exp_first_use_local;

        require_pfs_local = atomic_load_int(&ipsec_require_pfs);

        def_enc_local = atomic_load_int(&ipsec_def_enc);
        def_comp_local = atomic_load_int(&ipsec_def_comp);
        def_auth_local = atomic_load_int(&ipsec_def_auth);

        soft_allocations_local = atomic_load_int(&ipsec_soft_allocations);
        exp_allocations_local = atomic_load_int(&ipsec_exp_allocations);

        soft_bytes_local = atomic_load_int(&ipsec_soft_bytes);
        exp_bytes_local = atomic_load_int(&ipsec_exp_bytes);

        soft_timeout_local = atomic_load_int(&ipsec_soft_timeout);
        exp_timeout_local = atomic_load_int(&ipsec_exp_timeout);

        soft_first_use_local = atomic_load_int(&ipsec_soft_first_use);
        exp_first_use_local = atomic_load_int(&ipsec_exp_first_use);
#endif

        mtx_enter(&pfkeyv2_mtx);
        *seq = pfkeyv2_seq++;

        registered = nregistered;
        mtx_leave(&pfkeyv2_mtx);

        if (!registered) {
                rval = ESRCH;
                goto ret;
        }

        /* How large a buffer do we need... XXX we only do one proposal for now */
        i = sizeof(struct sadb_msg) +
            (laddr == NULL ? 0 : sizeof(struct sadb_address) +
                PADUP(ipo->ipo_src.sa.sa_len)) +
            sizeof(struct sadb_address) + PADUP(gw->sa.sa_len) +
            sizeof(struct sadb_prop) + 1 * sizeof(struct sadb_comb);

        if (ipo->ipo_ids) {
                i += sizeof(struct sadb_ident) + PADUP(ipo->ipo_ids->id_local->len);
                i += sizeof(struct sadb_ident) + PADUP(ipo->ipo_ids->id_remote->len);
        }

        /* Allocate */
        if (!(p = malloc(i, M_PFKEY, M_NOWAIT | M_ZERO))) {
                rval = ENOMEM;
                goto ret;
        }

        bzero(headers, sizeof(headers));

        buffer = p;

        headers[0] = p;
        p += sizeof(struct sadb_msg);

        smsg = (struct sadb_msg *) headers[0];
        smsg->sadb_msg_version = PF_KEY_V2;
        smsg->sadb_msg_type = SADB_ACQUIRE;
        smsg->sadb_msg_len = i / sizeof(uint64_t);
        smsg->sadb_msg_seq = *seq;

        if (ipo->ipo_sproto == IPPROTO_ESP)
                smsg->sadb_msg_satype = SADB_SATYPE_ESP;
        else if (ipo->ipo_sproto == IPPROTO_AH)
                smsg->sadb_msg_satype = SADB_SATYPE_AH;
        else if (ipo->ipo_sproto == IPPROTO_IPCOMP)
                smsg->sadb_msg_satype = SADB_X_SATYPE_IPCOMP;

        if (laddr) {
                headers[SADB_EXT_ADDRESS_SRC] = p;
                p += sizeof(struct sadb_address) + PADUP(laddr->sa.sa_len);
                sadd = (struct sadb_address *) headers[SADB_EXT_ADDRESS_SRC];
                sadd->sadb_address_len = (sizeof(struct sadb_address) +
                    laddr->sa.sa_len + sizeof(uint64_t) - 1) /
                    sizeof(uint64_t);
                bcopy(laddr, headers[SADB_EXT_ADDRESS_SRC] +
                    sizeof(struct sadb_address), laddr->sa.sa_len);
        }

        headers[SADB_EXT_ADDRESS_DST] = p;
        p += sizeof(struct sadb_address) + PADUP(gw->sa.sa_len);
        sadd = (struct sadb_address *) headers[SADB_EXT_ADDRESS_DST];
        sadd->sadb_address_len = (sizeof(struct sadb_address) +
            gw->sa.sa_len + sizeof(uint64_t) - 1) / sizeof(uint64_t);
        bcopy(gw, headers[SADB_EXT_ADDRESS_DST] + sizeof(struct sadb_address),
            gw->sa.sa_len);

        if (ipo->ipo_ids)
                export_identities(&p, ipo->ipo_ids, 0, headers);

        headers[SADB_EXT_PROPOSAL] = p;
        p += sizeof(struct sadb_prop);
        sa_prop = (struct sadb_prop *) headers[SADB_EXT_PROPOSAL];
        sa_prop->sadb_prop_num = 1; /* XXX One proposal only */
        sa_prop->sadb_prop_len = (sizeof(struct sadb_prop) +
            (sizeof(struct sadb_comb) * sa_prop->sadb_prop_num)) /
            sizeof(uint64_t);

        sadb_comb = p;

        /* XXX Should actually ask the crypto layer what's supported */
        for (j = 0; j < sa_prop->sadb_prop_num; j++) {
                sadb_comb->sadb_comb_flags = 0;
#ifdef IPSEC
                if (require_pfs_local)
                        sadb_comb->sadb_comb_flags |= SADB_SAFLAGS_PFS;

                if (ipo->ipo_sproto == IPPROTO_ESP) {
                        /* Set the encryption algorithm */
                        switch(def_enc_local) {
                        case IPSEC_ENC_AES:
                                sadb_comb->sadb_comb_encrypt = SADB_X_EALG_AES;
                                sadb_comb->sadb_comb_encrypt_minbits = 128;
                                sadb_comb->sadb_comb_encrypt_maxbits = 256;
                                break;
                        case IPSEC_ENC_AESCTR:
                                sadb_comb->sadb_comb_encrypt =
                                    SADB_X_EALG_AESCTR;
                                sadb_comb->sadb_comb_encrypt_minbits = 128 + 32;
                                sadb_comb->sadb_comb_encrypt_maxbits = 256 + 32;
                                break;
                        case IPSEC_ENC_3DES:
                                sadb_comb->sadb_comb_encrypt =
                                    SADB_EALG_3DESCBC;
                                sadb_comb->sadb_comb_encrypt_minbits = 192;
                                sadb_comb->sadb_comb_encrypt_maxbits = 192;
                                break;
                        case IPSEC_ENC_BLOWFISH:
                                sadb_comb->sadb_comb_encrypt = SADB_X_EALG_BLF;
                                sadb_comb->sadb_comb_encrypt_minbits = 40;
                                sadb_comb->sadb_comb_encrypt_maxbits =
                                    BLF_MAXKEYLEN * 8;
                                break;
                        case IPSEC_ENC_CAST128:
                                sadb_comb->sadb_comb_encrypt = SADB_X_EALG_CAST;
                                sadb_comb->sadb_comb_encrypt_minbits = 40;
                                sadb_comb->sadb_comb_encrypt_maxbits = 128;
                                break;
                        }
                } else if (ipo->ipo_sproto == IPPROTO_IPCOMP) {
                        /* Set the compression algorithm */
                        switch(def_comp_local) {
                        case IPSEC_COMP_DEFLATE:
                                sadb_comb->sadb_comb_encrypt =
                                    SADB_X_CALG_DEFLATE;
                                sadb_comb->sadb_comb_encrypt_minbits = 0;
                                sadb_comb->sadb_comb_encrypt_maxbits = 0;
                                break;
                        }
                }

                /* Set the authentication algorithm */
                switch(def_auth_local) {
                case IPSEC_AUTH_HMAC_SHA1:
                        sadb_comb->sadb_comb_auth = SADB_AALG_SHA1HMAC;
                        sadb_comb->sadb_comb_auth_minbits = 160;
                        sadb_comb->sadb_comb_auth_maxbits = 160;
                        break;
                case IPSEC_AUTH_HMAC_RIPEMD160:
                        sadb_comb->sadb_comb_auth = SADB_X_AALG_RIPEMD160HMAC;
                        sadb_comb->sadb_comb_auth_minbits = 160;
                        sadb_comb->sadb_comb_auth_maxbits = 160;
                        break;
                case IPSEC_AUTH_MD5:
                        sadb_comb->sadb_comb_auth = SADB_AALG_MD5HMAC;
                        sadb_comb->sadb_comb_auth_minbits = 128;
                        sadb_comb->sadb_comb_auth_maxbits = 128;
                        break;
                case IPSEC_AUTH_SHA2_256:
                        sadb_comb->sadb_comb_auth = SADB_X_AALG_SHA2_256;
                        sadb_comb->sadb_comb_auth_minbits = 256;
                        sadb_comb->sadb_comb_auth_maxbits = 256;
                        break;
                case IPSEC_AUTH_SHA2_384:
                        sadb_comb->sadb_comb_auth = SADB_X_AALG_SHA2_384;
                        sadb_comb->sadb_comb_auth_minbits = 384;
                        sadb_comb->sadb_comb_auth_maxbits = 384;
                        break;
                case IPSEC_AUTH_SHA2_512:
                        sadb_comb->sadb_comb_auth = SADB_X_AALG_SHA2_512;
                        sadb_comb->sadb_comb_auth_minbits = 512;
                        sadb_comb->sadb_comb_auth_maxbits = 512;
                        break;
                }

                sadb_comb->sadb_comb_soft_allocations = soft_allocations_local;
                sadb_comb->sadb_comb_hard_allocations = exp_allocations_local;

                sadb_comb->sadb_comb_soft_bytes = soft_bytes_local;
                sadb_comb->sadb_comb_hard_bytes = exp_bytes_local;

                sadb_comb->sadb_comb_soft_addtime = soft_timeout_local;
                sadb_comb->sadb_comb_hard_addtime = exp_timeout_local;

                sadb_comb->sadb_comb_soft_usetime = soft_first_use_local;
                sadb_comb->sadb_comb_hard_usetime = exp_first_use_local;
#endif
                sadb_comb++;
        }

        /* Send the ACQUIRE message to all compliant registered listeners. */
        if ((rval = pfkeyv2_sendmessage(headers,
            PFKEYV2_SENDMESSAGE_REGISTERED, NULL, smsg->sadb_msg_satype, 0,
            ipo->ipo_rdomain)) != 0)
                goto ret;

        rval = 0;
ret:
        if (buffer != NULL) {
                explicit_bzero(buffer, i);
                free(buffer, M_PFKEY, i);
        }

        return (rval);
}

/*
 * Notify key management that an expiration went off. The second argument
 * specifies the type of expiration (soft or hard).
 */
int
pfkeyv2_expire(struct tdb *tdb, u_int16_t type)
{
        void *p, *headers[SADB_EXT_MAX+1], *buffer = NULL;
        struct sadb_msg *smsg;
        int rval = 0;
        int i;

        NET_ASSERT_LOCKED();

        switch (tdb->tdb_sproto) {
        case IPPROTO_AH:
        case IPPROTO_ESP:
        case IPPROTO_IPIP:
        case IPPROTO_IPCOMP:
#ifdef TCP_SIGNATURE
        case IPPROTO_TCP:
#endif /* TCP_SIGNATURE */
                break;

        default:
                rval = EOPNOTSUPP;
                goto ret;
        }

        i = sizeof(struct sadb_msg) + sizeof(struct sadb_sa) +
            2 * sizeof(struct sadb_lifetime) +
            sizeof(struct sadb_address) + PADUP(tdb->tdb_src.sa.sa_len) +
            sizeof(struct sadb_address) + PADUP(tdb->tdb_dst.sa.sa_len);

        if (!(p = malloc(i, M_PFKEY, M_NOWAIT | M_ZERO))) {
                rval = ENOMEM;
                goto ret;
        }

        bzero(headers, sizeof(headers));

        buffer = p;

        headers[0] = p;
        p += sizeof(struct sadb_msg);

        smsg = (struct sadb_msg *) headers[0];
        smsg->sadb_msg_version = PF_KEY_V2;
        smsg->sadb_msg_type = SADB_EXPIRE;
        smsg->sadb_msg_satype = tdb->tdb_satype;
        smsg->sadb_msg_len = i / sizeof(uint64_t);

        mtx_enter(&pfkeyv2_mtx);
        smsg->sadb_msg_seq = pfkeyv2_seq++;
        mtx_leave(&pfkeyv2_mtx);

        headers[SADB_EXT_SA] = p;
        export_sa(&p, tdb);

        headers[SADB_EXT_LIFETIME_CURRENT] = p;
        export_lifetime(&p, tdb, PFKEYV2_LIFETIME_CURRENT);

        headers[type] = p;
        export_lifetime(&p, tdb, type == SADB_EXT_LIFETIME_SOFT ?
            PFKEYV2_LIFETIME_SOFT : PFKEYV2_LIFETIME_HARD);

        headers[SADB_EXT_ADDRESS_SRC] = p;
        export_address(&p, &tdb->tdb_src.sa);

        headers[SADB_EXT_ADDRESS_DST] = p;
        export_address(&p, &tdb->tdb_dst.sa);

        if ((rval = pfkeyv2_sendmessage(headers, PFKEYV2_SENDMESSAGE_BROADCAST,
            NULL, 0, 0, tdb->tdb_rdomain)) != 0)
                goto ret;
        /* XXX */
        if (tdb->tdb_rdomain != tdb->tdb_rdomain_post)
                if ((rval = pfkeyv2_sendmessage(headers,
                    PFKEYV2_SENDMESSAGE_BROADCAST, NULL, 0, 0,
                    tdb->tdb_rdomain_post)) != 0)
                        goto ret;

        rval = 0;

 ret:
        if (buffer != NULL) {
                explicit_bzero(buffer, i);
                free(buffer, M_PFKEY, i);
        }

        return (rval);
}

struct pfkeyv2_sysctl_walk {
        void            *w_where;
        size_t           w_len;
        int              w_op;
        u_int8_t         w_satype;
};

int
pfkeyv2_sysctl_walker(struct tdb *tdb, void *arg, int last)
{
        struct pfkeyv2_sysctl_walk *w = (struct pfkeyv2_sysctl_walk *)arg;
        void *buffer = NULL;
        int error = 0;
        int usedlen, buflen, i;

        if (w->w_satype != SADB_SATYPE_UNSPEC &&
            w->w_satype != tdb->tdb_satype)
                return (0);

        if (w->w_where) {
                void *headers[SADB_EXT_MAX+1];
                struct sadb_msg msg;

                bzero(headers, sizeof(headers));
                if ((error = pfkeyv2_get(tdb, headers, &buffer, &buflen,
                    &usedlen)) != 0)
                        goto done;
                if (w->w_len < sizeof(msg) + usedlen) {
                        error = ENOMEM;
                        goto done;
                }
                /* prepend header */
                bzero(&msg, sizeof(msg));
                msg.sadb_msg_version = PF_KEY_V2;
                msg.sadb_msg_satype = tdb->tdb_satype;
                msg.sadb_msg_type = SADB_DUMP;
                msg.sadb_msg_len = (sizeof(msg) + usedlen) / sizeof(uint64_t);
                if ((error = copyout(&msg, w->w_where, sizeof(msg))) != 0)
                        goto done;
                w->w_where += sizeof(msg);
                w->w_len -= sizeof(msg);
                /* set extension type */
                for (i = 1; i <= SADB_EXT_MAX; i++)
                        if (headers[i])
                                ((struct sadb_ext *)
                                    headers[i])->sadb_ext_type = i;
                if ((error = copyout(buffer, w->w_where, usedlen)) != 0)
                        goto done;
                w->w_where += usedlen;
                w->w_len -= usedlen;
        } else {
                if ((error = pfkeyv2_get(tdb, NULL, NULL, &buflen, NULL)) != 0)
                        return (error);
                w->w_len += buflen;
                w->w_len += sizeof(struct sadb_msg);
        }

done:
        if (buffer != NULL) {
                explicit_bzero(buffer, buflen);
                free(buffer, M_PFKEY, buflen);
        }
        return (error);
}

int
pfkeyv2_dump_policy(struct ipsec_policy *ipo, void **headers, void **buffer,
    int *lenp)
{
        int i, rval, perm;
        void *p;

        /* Find how much space we need. */
        i = 2 * sizeof(struct sadb_protocol);

        /* We'll need four of them: src, src mask, dst, dst mask. */
        switch (ipo->ipo_addr.sen_type) {
        case SENT_IP4:
                i += 4 * PADUP(sizeof(struct sockaddr_in));
                i += 4 * sizeof(struct sadb_address);
                break;
#ifdef INET6
        case SENT_IP6:
                i += 4 * PADUP(sizeof(struct sockaddr_in6));
                i += 4 * sizeof(struct sadb_address);
                break;
#endif /* INET6 */
        default:
                return (EINVAL);
        }

        /* Local address, might be zeroed. */
        switch (ipo->ipo_src.sa.sa_family) {
        case 0:
                break;
        case AF_INET:
                i += PADUP(sizeof(struct sockaddr_in));
                i += sizeof(struct sadb_address);
                break;
#ifdef INET6
        case AF_INET6:
                i += PADUP(sizeof(struct sockaddr_in6));
                i += sizeof(struct sadb_address);
                break;
#endif /* INET6 */
        default:
                return (EINVAL);
        }

        /* Remote address, might be zeroed. XXX ??? */
        switch (ipo->ipo_dst.sa.sa_family) {
        case 0:
                break;
        case AF_INET:
                i += PADUP(sizeof(struct sockaddr_in));
                i += sizeof(struct sadb_address);
                break;
#ifdef INET6
        case AF_INET6:
                i += PADUP(sizeof(struct sockaddr_in6));
                i += sizeof(struct sadb_address);
                break;
#endif /* INET6 */
        default:
                return (EINVAL);
        }

        if (ipo->ipo_ids) {
                i += sizeof(struct sadb_ident) + PADUP(ipo->ipo_ids->id_local->len);
                i += sizeof(struct sadb_ident) + PADUP(ipo->ipo_ids->id_remote->len);
        }

        if (lenp)
                *lenp = i;

        if (buffer == NULL) {
                rval = 0;
                goto ret;
        }

        if (!(p = malloc(i, M_PFKEY, M_NOWAIT | M_ZERO))) {
                rval = ENOMEM;
                goto ret;
        } else
                *buffer = p;

        /* Local address. */
        if (ipo->ipo_src.sa.sa_family) {
                headers[SADB_EXT_ADDRESS_SRC] = p;
                export_address(&p, &ipo->ipo_src.sa);
        }

        /* Remote address. */
        if (ipo->ipo_dst.sa.sa_family) {
                headers[SADB_EXT_ADDRESS_DST] = p;
                export_address(&p, &ipo->ipo_dst.sa);
        }

        /* Get actual flow. */
        export_flow(&p, ipo->ipo_type, &ipo->ipo_addr, &ipo->ipo_mask,
            headers);

        /* Add ids only when we are root. */
        perm = suser(curproc);
        if (perm == 0 && ipo->ipo_ids)
                export_identities(&p, ipo->ipo_ids, 0, headers);

        rval = 0;
ret:
        return (rval);
}

int
pfkeyv2_sysctl_policydumper(struct ipsec_policy *ipo, void *arg,
    unsigned int tableid)
{
        struct pfkeyv2_sysctl_walk *w = (struct pfkeyv2_sysctl_walk *)arg;
        void *buffer = NULL;
        int i, buflen, error = 0;

        if (w->w_where) {
                void *headers[SADB_EXT_MAX + 1];
                struct sadb_msg msg;

                bzero(headers, sizeof(headers));
                if ((error = pfkeyv2_dump_policy(ipo, headers, &buffer,
                    &buflen)) != 0)
                        goto done;
                if (w->w_len < buflen) {
                        error = ENOMEM;
                        goto done;
                }
                /* prepend header */
                bzero(&msg, sizeof(msg));
                msg.sadb_msg_version = PF_KEY_V2;
                if (ipo->ipo_sproto == IPPROTO_ESP)
                        msg.sadb_msg_satype = SADB_SATYPE_ESP;
                else if (ipo->ipo_sproto == IPPROTO_AH)
                        msg.sadb_msg_satype = SADB_SATYPE_AH;
                else if (ipo->ipo_sproto == IPPROTO_IPCOMP)
                        msg.sadb_msg_satype = SADB_X_SATYPE_IPCOMP;
                else if (ipo->ipo_sproto == IPPROTO_IPIP)
                        msg.sadb_msg_satype = SADB_X_SATYPE_IPIP;
                msg.sadb_msg_type = SADB_X_SPDDUMP;
                msg.sadb_msg_len = (sizeof(msg) + buflen) / sizeof(uint64_t);
                if ((error = copyout(&msg, w->w_where, sizeof(msg))) != 0)
                        goto done;
                w->w_where += sizeof(msg);
                w->w_len -= sizeof(msg);
                /* set extension type */
                for (i = 1; i <= SADB_EXT_MAX; i++)
                        if (headers[i])
                                ((struct sadb_ext *)
                                    headers[i])->sadb_ext_type = i;
                if ((error = copyout(buffer, w->w_where, buflen)) != 0)
                        goto done;
                w->w_where += buflen;
                w->w_len -= buflen;
        } else {
                if ((error = pfkeyv2_dump_policy(ipo, NULL, NULL,
                    &buflen)) != 0)
                        goto done;
                w->w_len += buflen;
                w->w_len += sizeof(struct sadb_msg);
        }

done:
        if (buffer)
                free(buffer, M_PFKEY, buflen);
        return (error);
}

int
pfkeyv2_policy_flush(struct ipsec_policy *ipo, void *arg, unsigned int tableid)
{
        int error;

        error = ipsec_delete_policy(ipo);
        if (error == 0)
                error = EAGAIN;

        return (error);
}

int
pfkeyv2_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
    void *new, size_t newlen)
{
        struct pfkeyv2_sysctl_walk w;
        int error = EINVAL;
        u_int rdomain;
        u_int tableid;

        if (new)
                return (EPERM);
        if (namelen < 1)
                return (EINVAL);
        w.w_op = name[0];
        if (namelen >= 2)
                w.w_satype = name[1];
        else
                w.w_satype = SADB_SATYPE_UNSPEC;
        w.w_where = oldp;
        w.w_len = oldp ? *oldlenp : 0;

        if (namelen == 3) {
                tableid = name[2];
                if (!rtable_exists(tableid))
                        return (ENOENT);
        } else
                tableid = curproc->p_p->ps_rtableid;
        rdomain = rtable_l2(tableid);

        switch(w.w_op) {
        case NET_KEY_SADB_DUMP:
                if ((error = suser(curproc)) != 0)
                        return (error);
                NET_LOCK();
                error = tdb_walk(rdomain, pfkeyv2_sysctl_walker, &w);
                NET_UNLOCK();
                if (oldp)
                        *oldlenp = w.w_where - oldp;
                else
                        *oldlenp = w.w_len;
                break;

        case NET_KEY_SPD_DUMP:
                NET_LOCK_SHARED();
                error = spd_table_walk(rdomain,
                    pfkeyv2_sysctl_policydumper, &w);
                NET_UNLOCK_SHARED();
                if (oldp)
                        *oldlenp = w.w_where - oldp;
                else
                        *oldlenp = w.w_len;
                break;
        }

        return (error);
}