xref: /freebsd/sys/netipsec/ipsec_output.c (revision f9d8f665523d118129b4128f5cf51c8d968fc904)
1aaea26efSSam Leffler /*-
2aaea26efSSam Leffler  * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
3aaea26efSSam Leffler  * All rights reserved.
4aaea26efSSam Leffler  *
5aaea26efSSam Leffler  * Redistribution and use in source and binary forms, with or without
6aaea26efSSam Leffler  * modification, are permitted provided that the following conditions
7aaea26efSSam Leffler  * are met:
8aaea26efSSam Leffler  * 1. Redistributions of source code must retain the above copyright
9aaea26efSSam Leffler  *    notice, this list of conditions and the following disclaimer.
10aaea26efSSam Leffler  * 2. Redistributions in binary form must reproduce the above copyright
11aaea26efSSam Leffler  *    notice, this list of conditions and the following disclaimer in the
12aaea26efSSam Leffler  *    documentation and/or other materials provided with the distribution.
13aaea26efSSam Leffler  *
14aaea26efSSam Leffler  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15aaea26efSSam Leffler  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16aaea26efSSam Leffler  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17aaea26efSSam Leffler  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18aaea26efSSam Leffler  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19aaea26efSSam Leffler  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20aaea26efSSam Leffler  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21aaea26efSSam Leffler  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22aaea26efSSam Leffler  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23aaea26efSSam Leffler  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24aaea26efSSam Leffler  * SUCH DAMAGE.
25aaea26efSSam Leffler  *
26aaea26efSSam Leffler  * $FreeBSD$
27aaea26efSSam Leffler  */
2888768458SSam Leffler 
2988768458SSam Leffler /*
3088768458SSam Leffler  * IPsec output processing.
3188768458SSam Leffler  */
3288768458SSam Leffler #include "opt_inet.h"
3388768458SSam Leffler #include "opt_inet6.h"
3488768458SSam Leffler #include "opt_ipsec.h"
35bdea400fSAndrew Thompson #include "opt_enc.h"
3688768458SSam Leffler 
3788768458SSam Leffler #include <sys/param.h>
3888768458SSam Leffler #include <sys/systm.h>
3988768458SSam Leffler #include <sys/mbuf.h>
4088768458SSam Leffler #include <sys/domain.h>
4188768458SSam Leffler #include <sys/protosw.h>
4288768458SSam Leffler #include <sys/socket.h>
4388768458SSam Leffler #include <sys/errno.h>
4488768458SSam Leffler #include <sys/syslog.h>
4588768458SSam Leffler 
4688768458SSam Leffler #include <net/if.h>
4776039bc8SGleb Smirnoff #include <net/if_var.h>
48b28cd334SBjoern A. Zeeb #include <net/pfil.h>
4988768458SSam Leffler #include <net/route.h>
50eddfbb76SRobert Watson #include <net/vnet.h>
5188768458SSam Leffler 
5288768458SSam Leffler #include <netinet/in.h>
5388768458SSam Leffler #include <netinet/in_systm.h>
5488768458SSam Leffler #include <netinet/ip.h>
5588768458SSam Leffler #include <netinet/ip_var.h>
5688768458SSam Leffler #include <netinet/in_var.h>
5788768458SSam Leffler #include <netinet/ip_ecn.h>
5888768458SSam Leffler #ifdef INET6
5988768458SSam Leffler #include <netinet6/ip6_ecn.h>
6088768458SSam Leffler #endif
6188768458SSam Leffler 
6288768458SSam Leffler #include <netinet/ip6.h>
6388768458SSam Leffler #ifdef INET6
6488768458SSam Leffler #include <netinet6/ip6_var.h>
6588768458SSam Leffler #endif
6688768458SSam Leffler #include <netinet/in_pcb.h>
6788768458SSam Leffler #ifdef INET6
6888768458SSam Leffler #include <netinet/icmp6.h>
6988768458SSam Leffler #endif
7088768458SSam Leffler 
7188768458SSam Leffler #include <netipsec/ipsec.h>
7288768458SSam Leffler #ifdef INET6
7388768458SSam Leffler #include <netipsec/ipsec6.h>
7488768458SSam Leffler #endif
7588768458SSam Leffler #include <netipsec/ah_var.h>
7688768458SSam Leffler #include <netipsec/esp_var.h>
7788768458SSam Leffler #include <netipsec/ipcomp_var.h>
7888768458SSam Leffler 
7988768458SSam Leffler #include <netipsec/xform.h>
8088768458SSam Leffler 
8188768458SSam Leffler #include <netipsec/key.h>
8288768458SSam Leffler #include <netipsec/keydb.h>
8388768458SSam Leffler #include <netipsec/key_debug.h>
8488768458SSam Leffler 
8588768458SSam Leffler #include <machine/in_cksum.h>
8688768458SSam Leffler 
877b495c44SVANHULLEBUS Yvan #ifdef IPSEC_NAT_T
887b495c44SVANHULLEBUS Yvan #include <netinet/udp.h>
897b495c44SVANHULLEBUS Yvan #endif
907b495c44SVANHULLEBUS Yvan 
9197c2a697SVANHULLEBUS Yvan #ifdef DEV_ENC
9297c2a697SVANHULLEBUS Yvan #include <net/if_enc.h>
9397c2a697SVANHULLEBUS Yvan #endif
9497c2a697SVANHULLEBUS Yvan 
9597c2a697SVANHULLEBUS Yvan 
9688768458SSam Leffler int
9788768458SSam Leffler ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
9888768458SSam Leffler {
9988768458SSam Leffler 	struct tdb_ident *tdbi;
10088768458SSam Leffler 	struct m_tag *mtag;
10188768458SSam Leffler 	struct secasvar *sav;
10288768458SSam Leffler 	struct secasindex *saidx;
10388768458SSam Leffler 	int error;
10488768458SSam Leffler 
1059ffa9677SSam Leffler 	IPSEC_ASSERT(m != NULL, ("null mbuf"));
1069ffa9677SSam Leffler 	IPSEC_ASSERT(isr != NULL, ("null ISR"));
10788768458SSam Leffler 	sav = isr->sav;
1089ffa9677SSam Leffler 	IPSEC_ASSERT(sav != NULL, ("null SA"));
1099ffa9677SSam Leffler 	IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
11088768458SSam Leffler 
11188768458SSam Leffler 	saidx = &sav->sah->saidx;
11288768458SSam Leffler 	switch (saidx->dst.sa.sa_family) {
11388768458SSam Leffler #ifdef INET
11488768458SSam Leffler 	case AF_INET:
11588768458SSam Leffler 		/* Fix the header length, for AH processing. */
11688768458SSam Leffler 		mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
11788768458SSam Leffler 		break;
11888768458SSam Leffler #endif /* INET */
11988768458SSam Leffler #ifdef INET6
12088768458SSam Leffler 	case AF_INET6:
12188768458SSam Leffler 		/* Fix the header length, for AH processing. */
12288768458SSam Leffler 		if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
12388768458SSam Leffler 			error = ENXIO;
12488768458SSam Leffler 			goto bad;
12588768458SSam Leffler 		}
12688768458SSam Leffler 		if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
12788768458SSam Leffler 			/* No jumbogram support. */
12888768458SSam Leffler 			error = ENXIO;	/*?*/
12988768458SSam Leffler 			goto bad;
13088768458SSam Leffler 		}
13188768458SSam Leffler 		mtod(m, struct ip6_hdr *)->ip6_plen =
13288768458SSam Leffler 			htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
13388768458SSam Leffler 		break;
13488768458SSam Leffler #endif /* INET6 */
13588768458SSam Leffler 	default:
1369ffa9677SSam Leffler 		DPRINTF(("%s: unknown protocol family %u\n", __func__,
13788768458SSam Leffler 		    saidx->dst.sa.sa_family));
13888768458SSam Leffler 		error = ENXIO;
13988768458SSam Leffler 		goto bad;
14088768458SSam Leffler 	}
14188768458SSam Leffler 
14288768458SSam Leffler 	/*
14388768458SSam Leffler 	 * Add a record of what we've done or what needs to be done to the
14488768458SSam Leffler 	 * packet.
14588768458SSam Leffler 	 */
14688768458SSam Leffler 	mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
14788768458SSam Leffler 			sizeof(struct tdb_ident), M_NOWAIT);
14888768458SSam Leffler 	if (mtag == NULL) {
1499ffa9677SSam Leffler 		DPRINTF(("%s: could not get packet tag\n", __func__));
15088768458SSam Leffler 		error = ENOMEM;
15188768458SSam Leffler 		goto bad;
15288768458SSam Leffler 	}
15388768458SSam Leffler 
15488768458SSam Leffler 	tdbi = (struct tdb_ident *)(mtag + 1);
15588768458SSam Leffler 	tdbi->dst = saidx->dst;
15688768458SSam Leffler 	tdbi->proto = saidx->proto;
15788768458SSam Leffler 	tdbi->spi = sav->spi;
15888768458SSam Leffler 	m_tag_prepend(m, mtag);
15988768458SSam Leffler 
16088768458SSam Leffler 	/*
16188768458SSam Leffler 	 * If there's another (bundled) SA to apply, do so.
16288768458SSam Leffler 	 * Note that this puts a burden on the kernel stack size.
16388768458SSam Leffler 	 * If this is a problem we'll need to introduce a queue
16488768458SSam Leffler 	 * to set the packet on so we can unwind the stack before
16588768458SSam Leffler 	 * doing further processing.
16688768458SSam Leffler 	 */
16788768458SSam Leffler 	if (isr->next) {
168174b0d41SBjoern A. Zeeb 		/* XXX-BZ currently only support same AF bundles. */
169db178eb8SBjoern A. Zeeb 		switch (saidx->dst.sa.sa_family) {
170db178eb8SBjoern A. Zeeb #ifdef INET
171db178eb8SBjoern A. Zeeb 		case AF_INET:
172*f9d8f665SAndrey V. Elsukov 			IPSECSTAT_INC(ips_out_bundlesa);
17388768458SSam Leffler 			return ipsec4_process_packet(m, isr->next, 0, 0);
174db178eb8SBjoern A. Zeeb 			/* NOTREACHED */
175db178eb8SBjoern A. Zeeb #endif
176db178eb8SBjoern A. Zeeb #ifdef notyet
177db178eb8SBjoern A. Zeeb #ifdef INET6
178db178eb8SBjoern A. Zeeb 		case AF_INET6:
179db178eb8SBjoern A. Zeeb 			/* XXX */
180*f9d8f665SAndrey V. Elsukov 			IPSEC6STAT_INC(ips_out_bundlesa);
181aaf2cfc0SVANHULLEBUS Yvan 			return ipsec6_process_packet(m, isr->next);
182db178eb8SBjoern A. Zeeb 			/* NOTREACHED */
183db178eb8SBjoern A. Zeeb #endif /* INET6 */
184db178eb8SBjoern A. Zeeb #endif
185db178eb8SBjoern A. Zeeb 		default:
186db178eb8SBjoern A. Zeeb 			DPRINTF(("%s: unknown protocol family %u\n", __func__,
187db178eb8SBjoern A. Zeeb 			    saidx->dst.sa.sa_family));
188db178eb8SBjoern A. Zeeb 			error = ENXIO;
189db178eb8SBjoern A. Zeeb 			goto bad;
190db178eb8SBjoern A. Zeeb 		}
19188768458SSam Leffler 	}
1925d1dbc0eSSam Leffler 	key_sa_recordxfer(sav, m);		/* record data transfer */
19388768458SSam Leffler 
19488768458SSam Leffler 	/*
19588768458SSam Leffler 	 * We're done with IPsec processing, transmit the packet using the
19688768458SSam Leffler 	 * appropriate network protocol (IP or IPv6). SPD lookup will be
19788768458SSam Leffler 	 * performed again there.
19888768458SSam Leffler 	 */
19988768458SSam Leffler 	switch (saidx->dst.sa.sa_family) {
20088768458SSam Leffler #ifdef INET
20188768458SSam Leffler 	case AF_INET:
2027b495c44SVANHULLEBUS Yvan #ifdef IPSEC_NAT_T
2037b495c44SVANHULLEBUS Yvan 		/*
2047b495c44SVANHULLEBUS Yvan 		 * If NAT-T is enabled, now that all IPsec processing is done
2057b495c44SVANHULLEBUS Yvan 		 * insert UDP encapsulation header after IP header.
2067b495c44SVANHULLEBUS Yvan 		 */
2077b495c44SVANHULLEBUS Yvan 		if (sav->natt_type) {
20820472bceSGleb Smirnoff 			struct ip *ip = mtod(m, struct ip *);
2097b495c44SVANHULLEBUS Yvan 			const int hlen = (ip->ip_hl << 2);
2107b495c44SVANHULLEBUS Yvan 			int size, off;
2117b495c44SVANHULLEBUS Yvan 			struct mbuf *mi;
2127b495c44SVANHULLEBUS Yvan 			struct udphdr *udp;
2137b495c44SVANHULLEBUS Yvan 
2147b495c44SVANHULLEBUS Yvan 			size = sizeof(struct udphdr);
2157b495c44SVANHULLEBUS Yvan 			if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
2167b495c44SVANHULLEBUS Yvan 				/*
2177b495c44SVANHULLEBUS Yvan 				 * draft-ietf-ipsec-nat-t-ike-0[01].txt and
2187b495c44SVANHULLEBUS Yvan 				 * draft-ietf-ipsec-udp-encaps-(00/)01.txt,
2197b495c44SVANHULLEBUS Yvan 				 * ignoring possible AH mode
2207b495c44SVANHULLEBUS Yvan 				 * non-IKE marker + non-ESP marker
2217b495c44SVANHULLEBUS Yvan 				 * from draft-ietf-ipsec-udp-encaps-00.txt.
2227b495c44SVANHULLEBUS Yvan 				 */
2237b495c44SVANHULLEBUS Yvan 				size += sizeof(u_int64_t);
2247b495c44SVANHULLEBUS Yvan 			}
2257b495c44SVANHULLEBUS Yvan 			mi = m_makespace(m, hlen, size, &off);
2267b495c44SVANHULLEBUS Yvan 			if (mi == NULL) {
2277b495c44SVANHULLEBUS Yvan 				DPRINTF(("%s: m_makespace for udphdr failed\n",
2287b495c44SVANHULLEBUS Yvan 				    __func__));
2297b495c44SVANHULLEBUS Yvan 				error = ENOBUFS;
2307b495c44SVANHULLEBUS Yvan 				goto bad;
2317b495c44SVANHULLEBUS Yvan 			}
2327b495c44SVANHULLEBUS Yvan 
2337b495c44SVANHULLEBUS Yvan 			udp = (struct udphdr *)(mtod(mi, caddr_t) + off);
2347b495c44SVANHULLEBUS Yvan 			if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
2357b495c44SVANHULLEBUS Yvan 				udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT);
2367b495c44SVANHULLEBUS Yvan 			else
2377b495c44SVANHULLEBUS Yvan 				udp->uh_sport =
2387b495c44SVANHULLEBUS Yvan 					KEY_PORTFROMSADDR(&sav->sah->saidx.src);
2397b495c44SVANHULLEBUS Yvan 			udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst);
2407b495c44SVANHULLEBUS Yvan 			udp->uh_sum = 0;
2417b495c44SVANHULLEBUS Yvan 			udp->uh_ulen = htons(m->m_pkthdr.len - hlen);
24220472bceSGleb Smirnoff 			ip->ip_len = htons(m->m_pkthdr.len);
2437b495c44SVANHULLEBUS Yvan 			ip->ip_p = IPPROTO_UDP;
2447b495c44SVANHULLEBUS Yvan 
2457b495c44SVANHULLEBUS Yvan 			if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
2467b495c44SVANHULLEBUS Yvan 				*(u_int64_t *)(udp + 1) = 0;
2477b495c44SVANHULLEBUS Yvan 		}
2487b495c44SVANHULLEBUS Yvan #endif /* IPSEC_NAT_T */
2497b495c44SVANHULLEBUS Yvan 
25088768458SSam Leffler 		return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
25188768458SSam Leffler #endif /* INET */
25288768458SSam Leffler #ifdef INET6
25388768458SSam Leffler 	case AF_INET6:
25488768458SSam Leffler 		/*
25588768458SSam Leffler 		 * We don't need massage, IPv6 header fields are always in
25688768458SSam Leffler 		 * net endian.
25788768458SSam Leffler 		 */
25888768458SSam Leffler 		return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
25988768458SSam Leffler #endif /* INET6 */
26088768458SSam Leffler 	}
26188768458SSam Leffler 	panic("ipsec_process_done");
26288768458SSam Leffler bad:
26388768458SSam Leffler 	m_freem(m);
26488768458SSam Leffler 	return (error);
26588768458SSam Leffler }
26688768458SSam Leffler 
26788768458SSam Leffler static struct ipsecrequest *
26888768458SSam Leffler ipsec_nextisr(
26988768458SSam Leffler 	struct mbuf *m,
27088768458SSam Leffler 	struct ipsecrequest *isr,
27188768458SSam Leffler 	int af,
27288768458SSam Leffler 	struct secasindex *saidx,
27388768458SSam Leffler 	int *error
27488768458SSam Leffler )
27588768458SSam Leffler {
276a04d64d8SAndrey V. Elsukov #define	IPSEC_OSTAT(name)	do {		\
277a04d64d8SAndrey V. Elsukov 	if (isr->saidx.proto == IPPROTO_ESP)	\
278a04d64d8SAndrey V. Elsukov 		ESPSTAT_INC(esps_##name);	\
279a04d64d8SAndrey V. Elsukov 	else if (isr->saidx.proto == IPPROTO_AH)\
280a04d64d8SAndrey V. Elsukov 		AHSTAT_INC(ahs_##name);		\
281a04d64d8SAndrey V. Elsukov 	else					\
282a04d64d8SAndrey V. Elsukov 		IPCOMPSTAT_INC(ipcomps_##name);	\
283a04d64d8SAndrey V. Elsukov } while (0)
28488768458SSam Leffler 	struct secasvar *sav;
28588768458SSam Leffler 
2869ffa9677SSam Leffler 	IPSECREQUEST_LOCK_ASSERT(isr);
2879ffa9677SSam Leffler 
2889ffa9677SSam Leffler 	IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
2899ffa9677SSam Leffler 		("invalid address family %u", af));
29088768458SSam Leffler again:
29188768458SSam Leffler 	/*
29288768458SSam Leffler 	 * Craft SA index to search for proper SA.  Note that
29388768458SSam Leffler 	 * we only fillin unspecified SA peers for transport
29488768458SSam Leffler 	 * mode; for tunnel mode they must already be filled in.
29588768458SSam Leffler 	 */
29688768458SSam Leffler 	*saidx = isr->saidx;
29788768458SSam Leffler 	if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
29888768458SSam Leffler 		/* Fillin unspecified SA peers only for transport mode */
29988768458SSam Leffler 		if (af == AF_INET) {
30088768458SSam Leffler 			struct sockaddr_in *sin;
30188768458SSam Leffler 			struct ip *ip = mtod(m, struct ip *);
30288768458SSam Leffler 
30388768458SSam Leffler 			if (saidx->src.sa.sa_len == 0) {
30488768458SSam Leffler 				sin = &saidx->src.sin;
30588768458SSam Leffler 				sin->sin_len = sizeof(*sin);
30688768458SSam Leffler 				sin->sin_family = AF_INET;
30788768458SSam Leffler 				sin->sin_port = IPSEC_PORT_ANY;
30888768458SSam Leffler 				sin->sin_addr = ip->ip_src;
30988768458SSam Leffler 			}
31088768458SSam Leffler 			if (saidx->dst.sa.sa_len == 0) {
31188768458SSam Leffler 				sin = &saidx->dst.sin;
31288768458SSam Leffler 				sin->sin_len = sizeof(*sin);
31388768458SSam Leffler 				sin->sin_family = AF_INET;
31488768458SSam Leffler 				sin->sin_port = IPSEC_PORT_ANY;
31588768458SSam Leffler 				sin->sin_addr = ip->ip_dst;
31688768458SSam Leffler 			}
31788768458SSam Leffler 		} else {
31888768458SSam Leffler 			struct sockaddr_in6 *sin6;
31988768458SSam Leffler 			struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
32088768458SSam Leffler 
32188768458SSam Leffler 			if (saidx->src.sin6.sin6_len == 0) {
32288768458SSam Leffler 				sin6 = (struct sockaddr_in6 *)&saidx->src;
32388768458SSam Leffler 				sin6->sin6_len = sizeof(*sin6);
32488768458SSam Leffler 				sin6->sin6_family = AF_INET6;
32588768458SSam Leffler 				sin6->sin6_port = IPSEC_PORT_ANY;
32688768458SSam Leffler 				sin6->sin6_addr = ip6->ip6_src;
32788768458SSam Leffler 				if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
32888768458SSam Leffler 					/* fix scope id for comparing SPD */
32988768458SSam Leffler 					sin6->sin6_addr.s6_addr16[1] = 0;
33088768458SSam Leffler 					sin6->sin6_scope_id =
33188768458SSam Leffler 					    ntohs(ip6->ip6_src.s6_addr16[1]);
33288768458SSam Leffler 				}
33388768458SSam Leffler 			}
33488768458SSam Leffler 			if (saidx->dst.sin6.sin6_len == 0) {
33588768458SSam Leffler 				sin6 = (struct sockaddr_in6 *)&saidx->dst;
33688768458SSam Leffler 				sin6->sin6_len = sizeof(*sin6);
33788768458SSam Leffler 				sin6->sin6_family = AF_INET6;
33888768458SSam Leffler 				sin6->sin6_port = IPSEC_PORT_ANY;
33988768458SSam Leffler 				sin6->sin6_addr = ip6->ip6_dst;
34088768458SSam Leffler 				if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
34188768458SSam Leffler 					/* fix scope id for comparing SPD */
34288768458SSam Leffler 					sin6->sin6_addr.s6_addr16[1] = 0;
34388768458SSam Leffler 					sin6->sin6_scope_id =
34488768458SSam Leffler 					    ntohs(ip6->ip6_dst.s6_addr16[1]);
34588768458SSam Leffler 				}
34688768458SSam Leffler 			}
34788768458SSam Leffler 		}
34888768458SSam Leffler 	}
34988768458SSam Leffler 
35088768458SSam Leffler 	/*
35188768458SSam Leffler 	 * Lookup SA and validate it.
35288768458SSam Leffler 	 */
35388768458SSam Leffler 	*error = key_checkrequest(isr, saidx);
35488768458SSam Leffler 	if (*error != 0) {
35588768458SSam Leffler 		/*
35688768458SSam Leffler 		 * IPsec processing is required, but no SA found.
35788768458SSam Leffler 		 * I assume that key_acquire() had been called
35888768458SSam Leffler 		 * to get/establish the SA. Here I discard
35988768458SSam Leffler 		 * this packet because it is responsibility for
36088768458SSam Leffler 		 * upper layer to retransmit the packet.
36188768458SSam Leffler 		 */
362f3c93842SAndrey V. Elsukov 		switch(af) {
363f3c93842SAndrey V. Elsukov 		case AF_INET:
3646659296cSAndrey V. Elsukov 			IPSECSTAT_INC(ips_out_nosa);
365f3c93842SAndrey V. Elsukov 			break;
366f3c93842SAndrey V. Elsukov #ifdef INET6
367f3c93842SAndrey V. Elsukov 		case AF_INET6:
368f3c93842SAndrey V. Elsukov 			IPSEC6STAT_INC(ips_out_nosa);
369f3c93842SAndrey V. Elsukov 			break;
370f3c93842SAndrey V. Elsukov #endif
371f3c93842SAndrey V. Elsukov 		}
37288768458SSam Leffler 		goto bad;
37388768458SSam Leffler 	}
37488768458SSam Leffler 	sav = isr->sav;
3759e3bdedeSBjoern A. Zeeb 	if (sav == NULL) {
3769ffa9677SSam Leffler 		IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
3779ffa9677SSam Leffler 			("no SA found, but required; level %u",
37888768458SSam Leffler 			ipsec_get_reqlevel(isr)));
3799ffa9677SSam Leffler 		IPSECREQUEST_UNLOCK(isr);
38088768458SSam Leffler 		isr = isr->next;
3819e3bdedeSBjoern A. Zeeb 		/*
3829e3bdedeSBjoern A. Zeeb 		 * If isr is NULL, we found a 'use' policy w/o SA.
3839e3bdedeSBjoern A. Zeeb 		 * Return w/o error and w/o isr so we can drop out
3849e3bdedeSBjoern A. Zeeb 		 * and continue w/o IPsec processing.
3859e3bdedeSBjoern A. Zeeb 		 */
3869e3bdedeSBjoern A. Zeeb 		if (isr == NULL)
38788768458SSam Leffler 			return isr;
3889ffa9677SSam Leffler 		IPSECREQUEST_LOCK(isr);
38988768458SSam Leffler 		goto again;
39088768458SSam Leffler 	}
39188768458SSam Leffler 
39288768458SSam Leffler 	/*
39388768458SSam Leffler 	 * Check system global policy controls.
39488768458SSam Leffler 	 */
395603724d3SBjoern A. Zeeb 	if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) ||
396603724d3SBjoern A. Zeeb 	    (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) ||
397603724d3SBjoern A. Zeeb 	    (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
3989ffa9677SSam Leffler 		DPRINTF(("%s: IPsec outbound packet dropped due"
3999ffa9677SSam Leffler 			" to policy (check your sysctls)\n", __func__));
400a04d64d8SAndrey V. Elsukov 		IPSEC_OSTAT(pdrops);
40188768458SSam Leffler 		*error = EHOSTUNREACH;
40288768458SSam Leffler 		goto bad;
40388768458SSam Leffler 	}
40488768458SSam Leffler 
40588768458SSam Leffler 	/*
40688768458SSam Leffler 	 * Sanity check the SA contents for the caller
40788768458SSam Leffler 	 * before they invoke the xform output method.
40888768458SSam Leffler 	 */
40988768458SSam Leffler 	if (sav->tdb_xform == NULL) {
4109ffa9677SSam Leffler 		DPRINTF(("%s: no transform for SA\n", __func__));
411a04d64d8SAndrey V. Elsukov 		IPSEC_OSTAT(noxform);
41288768458SSam Leffler 		*error = EHOSTUNREACH;
41388768458SSam Leffler 		goto bad;
41488768458SSam Leffler 	}
41588768458SSam Leffler 	return isr;
41688768458SSam Leffler bad:
4179ffa9677SSam Leffler 	IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
4189ffa9677SSam Leffler 	IPSECREQUEST_UNLOCK(isr);
41988768458SSam Leffler 	return NULL;
42088768458SSam Leffler #undef IPSEC_OSTAT
42188768458SSam Leffler }
42288768458SSam Leffler 
42388768458SSam Leffler #ifdef INET
42488768458SSam Leffler /*
42588768458SSam Leffler  * IPsec output logic for IPv4.
42688768458SSam Leffler  */
42788768458SSam Leffler int
42888768458SSam Leffler ipsec4_process_packet(
42988768458SSam Leffler 	struct mbuf *m,
43088768458SSam Leffler 	struct ipsecrequest *isr,
43188768458SSam Leffler 	int flags,
43288768458SSam Leffler 	int tunalready)
43388768458SSam Leffler {
43488768458SSam Leffler 	struct secasindex saidx;
43588768458SSam Leffler 	struct secasvar *sav;
43688768458SSam Leffler 	struct ip *ip;
4376464079fSSam Leffler 	int error, i, off;
43888768458SSam Leffler 
4399ffa9677SSam Leffler 	IPSEC_ASSERT(m != NULL, ("null mbuf"));
4409ffa9677SSam Leffler 	IPSEC_ASSERT(isr != NULL, ("null isr"));
44188768458SSam Leffler 
4429ffa9677SSam Leffler 	IPSECREQUEST_LOCK(isr);		/* insure SA contents don't change */
44388768458SSam Leffler 
44488768458SSam Leffler 	isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
4459e3bdedeSBjoern A. Zeeb 	if (isr == NULL) {
4469e3bdedeSBjoern A. Zeeb 		if (error != 0)
44788768458SSam Leffler 			goto bad;
4489e3bdedeSBjoern A. Zeeb 		return EJUSTRETURN;
4499e3bdedeSBjoern A. Zeeb 	}
45088768458SSam Leffler 
45188768458SSam Leffler 	sav = isr->sav;
452bdea400fSAndrew Thompson 
453bdea400fSAndrew Thompson #ifdef DEV_ENC
4546ff8af1cSGleb Smirnoff 	if_inc_counter(encif, IFCOUNTER_OPACKETS, 1);
4556ff8af1cSGleb Smirnoff 	if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len);
45697c2a697SVANHULLEBUS Yvan 
45719ad9831SBjoern A. Zeeb 	/* pass the mbuf to enc0 for bpf processing */
45819ad9831SBjoern A. Zeeb 	ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE);
459bdea400fSAndrew Thompson 	/* pass the mbuf to enc0 for packet filtering */
46019ad9831SBjoern A. Zeeb 	if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
461bdea400fSAndrew Thompson 		goto bad;
462bdea400fSAndrew Thompson #endif
463bdea400fSAndrew Thompson 
46488768458SSam Leffler 	if (!tunalready) {
46588768458SSam Leffler 		union sockaddr_union *dst = &sav->sah->saidx.dst;
46688768458SSam Leffler 		int setdf;
46788768458SSam Leffler 
46888768458SSam Leffler 		/*
46988768458SSam Leffler 		 * Collect IP_DF state from the outer header.
47088768458SSam Leffler 		 */
47188768458SSam Leffler 		if (dst->sa.sa_family == AF_INET) {
47288768458SSam Leffler 			if (m->m_len < sizeof (struct ip) &&
47388768458SSam Leffler 			    (m = m_pullup(m, sizeof (struct ip))) == NULL) {
47488768458SSam Leffler 				error = ENOBUFS;
47588768458SSam Leffler 				goto bad;
47688768458SSam Leffler 			}
47788768458SSam Leffler 			ip = mtod(m, struct ip *);
47888768458SSam Leffler 			/* Honor system-wide control of how to handle IP_DF */
479603724d3SBjoern A. Zeeb 			switch (V_ip4_ipsec_dfbit) {
48088768458SSam Leffler 			case 0:			/* clear in outer header */
48188768458SSam Leffler 			case 1:			/* set in outer header */
482603724d3SBjoern A. Zeeb 				setdf = V_ip4_ipsec_dfbit;
48388768458SSam Leffler 				break;
48488768458SSam Leffler 			default:		/* propagate to outer header */
48588768458SSam Leffler 				setdf = ntohs(ip->ip_off & IP_DF);
48688768458SSam Leffler 				break;
48788768458SSam Leffler 			}
48888768458SSam Leffler 		} else {
48988768458SSam Leffler 			ip = NULL;		/* keep compiler happy */
49088768458SSam Leffler 			setdf = 0;
49188768458SSam Leffler 		}
49288768458SSam Leffler 		/* Do the appropriate encapsulation, if necessary */
49388768458SSam Leffler 		if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
49488768458SSam Leffler 		    dst->sa.sa_family != AF_INET ||	    /* PF mismatch */
49588768458SSam Leffler #if 0
49688768458SSam Leffler 		    (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
49788768458SSam Leffler 		    sav->tdb_xform->xf_type == XF_IP4 ||    /* ditto */
49888768458SSam Leffler #endif
49988768458SSam Leffler 		    (dst->sa.sa_family == AF_INET &&	    /* Proxy */
50088768458SSam Leffler 		     dst->sin.sin_addr.s_addr != INADDR_ANY &&
50188768458SSam Leffler 		     dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
50288768458SSam Leffler 			struct mbuf *mp;
50388768458SSam Leffler 
50488768458SSam Leffler 			/* Fix IPv4 header checksum and length */
50588768458SSam Leffler 			if (m->m_len < sizeof (struct ip) &&
50688768458SSam Leffler 			    (m = m_pullup(m, sizeof (struct ip))) == NULL) {
50788768458SSam Leffler 				error = ENOBUFS;
50888768458SSam Leffler 				goto bad;
50988768458SSam Leffler 			}
51088768458SSam Leffler 			ip = mtod(m, struct ip *);
511b01e3d08SMarko Zec 			if (ip->ip_v == IPVERSION) {
51288768458SSam Leffler 				ip->ip_len = htons(m->m_pkthdr.len);
51388768458SSam Leffler 				ip->ip_sum = 0;
51488768458SSam Leffler 				ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
515b01e3d08SMarko Zec 			}
51688768458SSam Leffler 
51788768458SSam Leffler 			/* Encapsulate the packet */
51888768458SSam Leffler 			error = ipip_output(m, isr, &mp, 0, 0);
51988768458SSam Leffler 			if (mp == NULL && !error) {
52088768458SSam Leffler 				/* Should never happen. */
5219ffa9677SSam Leffler 				DPRINTF(("%s: ipip_output returns no mbuf and "
5229ffa9677SSam Leffler 					"no error!", __func__));
52388768458SSam Leffler 				error = EFAULT;
52488768458SSam Leffler 			}
52588768458SSam Leffler 			if (error) {
526b5b47bc6SSam Leffler 				if (mp) {
527b5b47bc6SSam Leffler 					/* XXX: Should never happen! */
52888768458SSam Leffler 					m_freem(mp);
529b5b47bc6SSam Leffler 				}
530b5b47bc6SSam Leffler 				m = NULL; /* ipip_output() already freed it */
53188768458SSam Leffler 				goto bad;
53288768458SSam Leffler 			}
53388768458SSam Leffler 			m = mp, mp = NULL;
53488768458SSam Leffler 			/*
53588768458SSam Leffler 			 * ipip_output clears IP_DF in the new header.  If
53688768458SSam Leffler 			 * we need to propagate IP_DF from the outer header,
53788768458SSam Leffler 			 * then we have to do it here.
53888768458SSam Leffler 			 *
53988768458SSam Leffler 			 * XXX shouldn't assume what ipip_output does.
54088768458SSam Leffler 			 */
54188768458SSam Leffler 			if (dst->sa.sa_family == AF_INET && setdf) {
54288768458SSam Leffler 				if (m->m_len < sizeof (struct ip) &&
54388768458SSam Leffler 				    (m = m_pullup(m, sizeof (struct ip))) == NULL) {
54488768458SSam Leffler 					error = ENOBUFS;
54588768458SSam Leffler 					goto bad;
54688768458SSam Leffler 				}
54788768458SSam Leffler 				ip = mtod(m, struct ip *);
54888768458SSam Leffler 				ip->ip_off = ntohs(ip->ip_off);
54988768458SSam Leffler 				ip->ip_off |= IP_DF;
55088768458SSam Leffler 				ip->ip_off = htons(ip->ip_off);
55188768458SSam Leffler 			}
55288768458SSam Leffler 		}
55388768458SSam Leffler 	}
55488768458SSam Leffler 
555bdea400fSAndrew Thompson #ifdef DEV_ENC
556bdea400fSAndrew Thompson 	/* pass the mbuf to enc0 for bpf processing */
557aaf2cfc0SVANHULLEBUS Yvan 	ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER);
55819ad9831SBjoern A. Zeeb 	/* pass the mbuf to enc0 for packet filtering */
55919ad9831SBjoern A. Zeeb 	if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
56019ad9831SBjoern A. Zeeb 		goto bad;
561bdea400fSAndrew Thompson #endif
562bdea400fSAndrew Thompson 
56388768458SSam Leffler 	/*
56488768458SSam Leffler 	 * Dispatch to the appropriate IPsec transform logic.  The
56588768458SSam Leffler 	 * packet will be returned for transmission after crypto
56688768458SSam Leffler 	 * processing, etc. are completed.  For encapsulation we
56788768458SSam Leffler 	 * bypass this call because of the explicit call done above
56888768458SSam Leffler 	 * (necessary to deal with IP_DF handling for IPv4).
56988768458SSam Leffler 	 *
57088768458SSam Leffler 	 * NB: m & sav are ``passed to caller'' who's reponsible for
57188768458SSam Leffler 	 *     for reclaiming their resources.
57288768458SSam Leffler 	 */
57388768458SSam Leffler 	if (sav->tdb_xform->xf_type != XF_IP4) {
574aaf2cfc0SVANHULLEBUS Yvan 		union sockaddr_union *dst = &sav->sah->saidx.dst;
575aaf2cfc0SVANHULLEBUS Yvan 		switch(dst->sa.sa_family) {
576aaf2cfc0SVANHULLEBUS Yvan 		case AF_INET:
57788768458SSam Leffler 			ip = mtod(m, struct ip *);
57888768458SSam Leffler 			i = ip->ip_hl << 2;
57988768458SSam Leffler 			off = offsetof(struct ip, ip_p);
580aaf2cfc0SVANHULLEBUS Yvan 			break;
581aaf2cfc0SVANHULLEBUS Yvan #ifdef INET6
582aaf2cfc0SVANHULLEBUS Yvan 		case AF_INET6:
583aaf2cfc0SVANHULLEBUS Yvan 			i = sizeof(struct ip6_hdr);
584aaf2cfc0SVANHULLEBUS Yvan 			off = offsetof(struct ip6_hdr, ip6_nxt);
585aaf2cfc0SVANHULLEBUS Yvan 			break;
586aaf2cfc0SVANHULLEBUS Yvan #endif /* INET6 */
587aaf2cfc0SVANHULLEBUS Yvan 		default:
588aaf2cfc0SVANHULLEBUS Yvan 		DPRINTF(("%s: unsupported protocol family %u\n",
589aaf2cfc0SVANHULLEBUS Yvan 				 __func__, dst->sa.sa_family));
590aaf2cfc0SVANHULLEBUS Yvan 			error = EPFNOSUPPORT;
5916d120f90SBjoern A. Zeeb 			IPSECSTAT_INC(ips_out_inval);
592aaf2cfc0SVANHULLEBUS Yvan 			goto bad;
593aaf2cfc0SVANHULLEBUS Yvan 		}
59488768458SSam Leffler 		error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
59588768458SSam Leffler 	} else {
59688768458SSam Leffler 		error = ipsec_process_done(m, isr);
59788768458SSam Leffler 	}
5989ffa9677SSam Leffler 	IPSECREQUEST_UNLOCK(isr);
59988768458SSam Leffler 	return error;
60088768458SSam Leffler bad:
6019ffa9677SSam Leffler 	if (isr)
6029ffa9677SSam Leffler 		IPSECREQUEST_UNLOCK(isr);
60388768458SSam Leffler 	if (m)
60488768458SSam Leffler 		m_freem(m);
60588768458SSam Leffler 	return error;
60688768458SSam Leffler }
60788768458SSam Leffler #endif
60888768458SSam Leffler 
609aaf2cfc0SVANHULLEBUS Yvan 
61088768458SSam Leffler #ifdef INET6
61188768458SSam Leffler static int
612aaf2cfc0SVANHULLEBUS Yvan in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia)
61388768458SSam Leffler {
614aaf2cfc0SVANHULLEBUS Yvan 	struct in6_addr ia2;
61588768458SSam Leffler 
616aaf2cfc0SVANHULLEBUS Yvan 	memcpy(&ia2, &sa->sin6_addr, sizeof(ia2));
617aaf2cfc0SVANHULLEBUS Yvan 	if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr))
618aaf2cfc0SVANHULLEBUS Yvan 		ia2.s6_addr16[1] = htons(sa->sin6_scope_id);
61988768458SSam Leffler 
620aaf2cfc0SVANHULLEBUS Yvan 	return IN6_ARE_ADDR_EQUAL(ia, &ia2);
62188768458SSam Leffler }
62288768458SSam Leffler 
62388768458SSam Leffler /*
624aaf2cfc0SVANHULLEBUS Yvan  * IPsec output logic for IPv6.
62588768458SSam Leffler  */
62688768458SSam Leffler int
627aaf2cfc0SVANHULLEBUS Yvan ipsec6_process_packet(
628aaf2cfc0SVANHULLEBUS Yvan 	struct mbuf *m,
629aaf2cfc0SVANHULLEBUS Yvan  	struct ipsecrequest *isr
630aaf2cfc0SVANHULLEBUS Yvan     )
63188768458SSam Leffler {
63288768458SSam Leffler 	struct secasindex saidx;
633aaf2cfc0SVANHULLEBUS Yvan 	struct secasvar *sav;
634aaf2cfc0SVANHULLEBUS Yvan 	struct ip6_hdr *ip6;
635aaf2cfc0SVANHULLEBUS Yvan 	int error, i, off;
636aaf2cfc0SVANHULLEBUS Yvan 	union sockaddr_union *dst;
63788768458SSam Leffler 
638aaf2cfc0SVANHULLEBUS Yvan 	IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf"));
639aaf2cfc0SVANHULLEBUS Yvan 	IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr"));
640923e1044SBjoern A. Zeeb 
641923e1044SBjoern A. Zeeb 	IPSECREQUEST_LOCK(isr);		/* insure SA contents don't change */
642aaf2cfc0SVANHULLEBUS Yvan 
64388768458SSam Leffler 	isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
6449e3bdedeSBjoern A. Zeeb 	if (isr == NULL) {
6459e3bdedeSBjoern A. Zeeb 		if (error != 0)
64688768458SSam Leffler 			goto bad;
6479e3bdedeSBjoern A. Zeeb 		return EJUSTRETURN;
6489e3bdedeSBjoern A. Zeeb 	}
64988768458SSam Leffler 
650aaf2cfc0SVANHULLEBUS Yvan 	sav = isr->sav;
651aaf2cfc0SVANHULLEBUS Yvan 	dst = &sav->sah->saidx.dst;
652aaf2cfc0SVANHULLEBUS Yvan 
65367fd1727SAndrey V. Elsukov 	ip6 = mtod(m, struct ip6_hdr *);
65467fd1727SAndrey V. Elsukov 	ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
65519ad9831SBjoern A. Zeeb #ifdef DEV_ENC
6566ff8af1cSGleb Smirnoff 	if_inc_counter(encif, IFCOUNTER_OPACKETS, 1);
6576ff8af1cSGleb Smirnoff 	if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len);
65897c2a697SVANHULLEBUS Yvan 
65919ad9831SBjoern A. Zeeb 	/* pass the mbuf to enc0 for bpf processing */
66019ad9831SBjoern A. Zeeb 	ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE);
66119ad9831SBjoern A. Zeeb 	/* pass the mbuf to enc0 for packet filtering */
66219ad9831SBjoern A. Zeeb 	if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
66319ad9831SBjoern A. Zeeb 		goto bad;
664aaf2cfc0SVANHULLEBUS Yvan #endif /* DEV_ENC */
66519ad9831SBjoern A. Zeeb 
666aaf2cfc0SVANHULLEBUS Yvan 	/* Do the appropriate encapsulation, if necessary */
667aaf2cfc0SVANHULLEBUS Yvan 	if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
668aaf2cfc0SVANHULLEBUS Yvan 	    dst->sa.sa_family != AF_INET6 ||        /* PF mismatch */
669aaf2cfc0SVANHULLEBUS Yvan 	    ((dst->sa.sa_family == AF_INET6) &&
670aaf2cfc0SVANHULLEBUS Yvan 	     (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) &&
671aaf2cfc0SVANHULLEBUS Yvan 	     (!in6_sa_equal_addrwithscope(&dst->sin6,
672aaf2cfc0SVANHULLEBUS Yvan 				  &ip6->ip6_dst)))) {
673aaf2cfc0SVANHULLEBUS Yvan 		struct mbuf *mp;
674aaf2cfc0SVANHULLEBUS Yvan 
675aaf2cfc0SVANHULLEBUS Yvan 		/* Fix IPv6 header payload length. */
676aaf2cfc0SVANHULLEBUS Yvan 		if (m->m_len < sizeof(struct ip6_hdr))
677aaf2cfc0SVANHULLEBUS Yvan 			if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) {
678aaf2cfc0SVANHULLEBUS Yvan 				error = ENOBUFS;
67988768458SSam Leffler 				goto bad;
68088768458SSam Leffler 			}
68188768458SSam Leffler 
682aaf2cfc0SVANHULLEBUS Yvan 		if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) {
683aaf2cfc0SVANHULLEBUS Yvan 			/* No jumbogram support. */
684aaf2cfc0SVANHULLEBUS Yvan 			error = ENXIO;   /*XXX*/
68588768458SSam Leffler 			goto bad;
68688768458SSam Leffler 		}
687aaf2cfc0SVANHULLEBUS Yvan 
688aaf2cfc0SVANHULLEBUS Yvan 		/* Encapsulate the packet */
689aaf2cfc0SVANHULLEBUS Yvan 		error = ipip_output(m, isr, &mp, 0, 0);
690aaf2cfc0SVANHULLEBUS Yvan 		if (mp == NULL && !error) {
691aaf2cfc0SVANHULLEBUS Yvan 			/* Should never happen. */
692aaf2cfc0SVANHULLEBUS Yvan 			DPRINTF(("ipsec6_process_packet: ipip_output "
693aaf2cfc0SVANHULLEBUS Yvan 				 "returns no mbuf and no error!"));
694aaf2cfc0SVANHULLEBUS Yvan 			error = EFAULT;
695aaf2cfc0SVANHULLEBUS Yvan 			goto bad;
696aaf2cfc0SVANHULLEBUS Yvan 		}
697aaf2cfc0SVANHULLEBUS Yvan 
69888768458SSam Leffler 		if (error) {
699aaf2cfc0SVANHULLEBUS Yvan 			if (mp) {
700aaf2cfc0SVANHULLEBUS Yvan 				/* XXX: Should never happen! */
701aaf2cfc0SVANHULLEBUS Yvan 				m_freem(mp);
70288768458SSam Leffler 			}
703aaf2cfc0SVANHULLEBUS Yvan 			m = NULL; /* ipip_output() already freed it */
70488768458SSam Leffler 			goto bad;
70588768458SSam Leffler 		}
70688768458SSam Leffler 
707aaf2cfc0SVANHULLEBUS Yvan 		m = mp;
708aaf2cfc0SVANHULLEBUS Yvan 		mp = NULL;
70988768458SSam Leffler 	}
71088768458SSam Leffler 
71119ad9831SBjoern A. Zeeb #ifdef DEV_ENC
712aaf2cfc0SVANHULLEBUS Yvan 	ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER);
71319ad9831SBjoern A. Zeeb 	/* pass the mbuf to enc0 for packet filtering */
71419ad9831SBjoern A. Zeeb 	if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
71519ad9831SBjoern A. Zeeb 		goto bad;
716aaf2cfc0SVANHULLEBUS Yvan #endif /* DEV_ENC */
71719ad9831SBjoern A. Zeeb 
718aaf2cfc0SVANHULLEBUS Yvan 	switch(dst->sa.sa_family) {
719aaf2cfc0SVANHULLEBUS Yvan #ifdef INET
720aaf2cfc0SVANHULLEBUS Yvan 	case AF_INET:
721aaf2cfc0SVANHULLEBUS Yvan 		{
722aaf2cfc0SVANHULLEBUS Yvan 		struct ip *ip;
723aaf2cfc0SVANHULLEBUS Yvan 		ip = mtod(m, struct ip *);
724aaf2cfc0SVANHULLEBUS Yvan 		i = ip->ip_hl << 2;
725aaf2cfc0SVANHULLEBUS Yvan 		off = offsetof(struct ip, ip_p);
726aaf2cfc0SVANHULLEBUS Yvan 		}
727aaf2cfc0SVANHULLEBUS Yvan 		break;
728aaf2cfc0SVANHULLEBUS Yvan #endif /* AF_INET */
729aaf2cfc0SVANHULLEBUS Yvan 	case AF_INET6:
730aaf2cfc0SVANHULLEBUS Yvan 		i = sizeof(struct ip6_hdr);
731aaf2cfc0SVANHULLEBUS Yvan 		off = offsetof(struct ip6_hdr, ip6_nxt);
732aaf2cfc0SVANHULLEBUS Yvan 		break;
733aaf2cfc0SVANHULLEBUS Yvan 	default:
734aaf2cfc0SVANHULLEBUS Yvan 		DPRINTF(("%s: unsupported protocol family %u\n",
735aaf2cfc0SVANHULLEBUS Yvan 				 __func__, dst->sa.sa_family));
736aaf2cfc0SVANHULLEBUS Yvan 		error = EPFNOSUPPORT;
737aaf2cfc0SVANHULLEBUS Yvan 		IPSEC6STAT_INC(ips_out_inval);
738aaf2cfc0SVANHULLEBUS Yvan 		goto bad;
739aaf2cfc0SVANHULLEBUS Yvan 	}
740aaf2cfc0SVANHULLEBUS Yvan 	error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
741923e1044SBjoern A. Zeeb 	IPSECREQUEST_UNLOCK(isr);
742923e1044SBjoern A. Zeeb 	return error;
74388768458SSam Leffler bad:
744aaf2cfc0SVANHULLEBUS Yvan 
745923e1044SBjoern A. Zeeb 	if (isr)
746923e1044SBjoern A. Zeeb 		IPSECREQUEST_UNLOCK(isr);
74788768458SSam Leffler 	if (m)
74888768458SSam Leffler 		m_freem(m);
74988768458SSam Leffler 	return error;
75088768458SSam Leffler }
75188768458SSam Leffler #endif /*INET6*/
752