736 lines
19 KiB
C
736 lines
19 KiB
C
/*-
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* Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* IPsec output processing.
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*/
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/hhook.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <net/if_enc.h>
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#include <net/if_var.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_ecn.h>
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#ifdef INET6
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#include <netinet6/ip6_ecn.h>
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#endif
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#include <netinet/ip6.h>
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#ifdef INET6
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#endif
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#include <netinet/in_pcb.h>
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#ifdef INET6
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#include <netinet/icmp6.h>
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#endif
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#include <netipsec/ipsec.h>
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#ifdef INET6
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#include <netipsec/ipsec6.h>
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#endif
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#include <netipsec/ah_var.h>
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#include <netipsec/esp_var.h>
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#include <netipsec/ipcomp_var.h>
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#include <netipsec/xform.h>
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#include <netipsec/key.h>
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#include <netipsec/keydb.h>
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#include <netipsec/key_debug.h>
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#include <machine/in_cksum.h>
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#ifdef IPSEC_NAT_T
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#include <netinet/udp.h>
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#endif
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int
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ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
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{
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struct tdb_ident *tdbi;
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struct m_tag *mtag;
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struct secasvar *sav;
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struct secasindex *saidx;
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int error;
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IPSEC_ASSERT(m != NULL, ("null mbuf"));
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IPSEC_ASSERT(isr != NULL, ("null ISR"));
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IPSEC_ASSERT(isr->sp != NULL, ("NULL isr->sp"));
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sav = isr->sav;
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IPSEC_ASSERT(sav != NULL, ("null SA"));
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IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
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saidx = &sav->sah->saidx;
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switch (saidx->dst.sa.sa_family) {
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#ifdef INET
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case AF_INET:
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/* Fix the header length, for AH processing. */
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mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
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break;
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#endif /* INET */
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#ifdef INET6
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case AF_INET6:
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/* Fix the header length, for AH processing. */
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if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
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error = ENXIO;
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goto bad;
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}
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if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
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/* No jumbogram support. */
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error = ENXIO; /*?*/
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goto bad;
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}
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mtod(m, struct ip6_hdr *)->ip6_plen =
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htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
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break;
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#endif /* INET6 */
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default:
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DPRINTF(("%s: unknown protocol family %u\n", __func__,
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saidx->dst.sa.sa_family));
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error = ENXIO;
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goto bad;
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}
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/*
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* Add a record of what we've done or what needs to be done to the
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* packet.
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*/
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mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
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sizeof(struct tdb_ident), M_NOWAIT);
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if (mtag == NULL) {
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DPRINTF(("%s: could not get packet tag\n", __func__));
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error = ENOMEM;
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goto bad;
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}
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tdbi = (struct tdb_ident *)(mtag + 1);
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tdbi->dst = saidx->dst;
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tdbi->proto = saidx->proto;
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tdbi->spi = sav->spi;
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m_tag_prepend(m, mtag);
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key_sa_recordxfer(sav, m); /* record data transfer */
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/*
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* If there's another (bundled) SA to apply, do so.
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* Note that this puts a burden on the kernel stack size.
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* If this is a problem we'll need to introduce a queue
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* to set the packet on so we can unwind the stack before
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* doing further processing.
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*/
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if (isr->next) {
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/* XXX-BZ currently only support same AF bundles. */
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switch (saidx->dst.sa.sa_family) {
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#ifdef INET
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case AF_INET:
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IPSECSTAT_INC(ips_out_bundlesa);
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return (ipsec4_process_packet(m, isr->next));
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/* NOTREACHED */
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#endif
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#ifdef notyet
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#ifdef INET6
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case AF_INET6:
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/* XXX */
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IPSEC6STAT_INC(ips_out_bundlesa);
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return (ipsec6_process_packet(m, isr->next));
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/* NOTREACHED */
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#endif /* INET6 */
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#endif
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default:
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DPRINTF(("%s: unknown protocol family %u\n", __func__,
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saidx->dst.sa.sa_family));
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error = ENXIO;
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goto bad;
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}
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}
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/*
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* We're done with IPsec processing, transmit the packet using the
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* appropriate network protocol (IP or IPv6).
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*/
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switch (saidx->dst.sa.sa_family) {
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#ifdef INET
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case AF_INET:
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#ifdef IPSEC_NAT_T
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/*
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* If NAT-T is enabled, now that all IPsec processing is done
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* insert UDP encapsulation header after IP header.
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*/
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if (sav->natt_type) {
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struct ip *ip = mtod(m, struct ip *);
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const int hlen = (ip->ip_hl << 2);
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int size, off;
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struct mbuf *mi;
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struct udphdr *udp;
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size = sizeof(struct udphdr);
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if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
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/*
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* draft-ietf-ipsec-nat-t-ike-0[01].txt and
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* draft-ietf-ipsec-udp-encaps-(00/)01.txt,
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* ignoring possible AH mode
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* non-IKE marker + non-ESP marker
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* from draft-ietf-ipsec-udp-encaps-00.txt.
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*/
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size += sizeof(u_int64_t);
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}
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mi = m_makespace(m, hlen, size, &off);
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if (mi == NULL) {
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DPRINTF(("%s: m_makespace for udphdr failed\n",
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__func__));
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error = ENOBUFS;
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goto bad;
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}
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udp = (struct udphdr *)(mtod(mi, caddr_t) + off);
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if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
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udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT);
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else
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udp->uh_sport =
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KEY_PORTFROMSADDR(&sav->sah->saidx.src);
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udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst);
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udp->uh_sum = 0;
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udp->uh_ulen = htons(m->m_pkthdr.len - hlen);
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ip->ip_len = htons(m->m_pkthdr.len);
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ip->ip_p = IPPROTO_UDP;
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if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
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*(u_int64_t *)(udp + 1) = 0;
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}
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#endif /* IPSEC_NAT_T */
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return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
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#endif /* INET */
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#ifdef INET6
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case AF_INET6:
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/*
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* We don't need massage, IPv6 header fields are always in
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* net endian.
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*/
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return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
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#endif /* INET6 */
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}
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panic("ipsec_process_done");
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bad:
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m_freem(m);
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return (error);
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}
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static struct ipsecrequest *
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ipsec_nextisr(
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struct mbuf *m,
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struct ipsecrequest *isr,
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int af,
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struct secasindex *saidx,
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int *error
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)
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{
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#define IPSEC_OSTAT(name) do { \
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if (isr->saidx.proto == IPPROTO_ESP) \
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ESPSTAT_INC(esps_##name); \
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else if (isr->saidx.proto == IPPROTO_AH)\
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AHSTAT_INC(ahs_##name); \
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else \
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IPCOMPSTAT_INC(ipcomps_##name); \
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} while (0)
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struct secasvar *sav;
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IPSECREQUEST_LOCK_ASSERT(isr);
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IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
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("invalid address family %u", af));
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again:
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/*
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* Craft SA index to search for proper SA. Note that
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* we only fillin unspecified SA peers for transport
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* mode; for tunnel mode they must already be filled in.
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*/
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*saidx = isr->saidx;
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if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
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/* Fillin unspecified SA peers only for transport mode */
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if (af == AF_INET) {
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struct sockaddr_in *sin;
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struct ip *ip = mtod(m, struct ip *);
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if (saidx->src.sa.sa_len == 0) {
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sin = &saidx->src.sin;
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sin->sin_len = sizeof(*sin);
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sin->sin_family = AF_INET;
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sin->sin_port = IPSEC_PORT_ANY;
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sin->sin_addr = ip->ip_src;
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}
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if (saidx->dst.sa.sa_len == 0) {
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sin = &saidx->dst.sin;
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sin->sin_len = sizeof(*sin);
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sin->sin_family = AF_INET;
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sin->sin_port = IPSEC_PORT_ANY;
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sin->sin_addr = ip->ip_dst;
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}
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} else {
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struct sockaddr_in6 *sin6;
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struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
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if (saidx->src.sin6.sin6_len == 0) {
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sin6 = (struct sockaddr_in6 *)&saidx->src;
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sin6->sin6_len = sizeof(*sin6);
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = IPSEC_PORT_ANY;
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sin6->sin6_addr = ip6->ip6_src;
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if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
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/* fix scope id for comparing SPD */
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sin6->sin6_addr.s6_addr16[1] = 0;
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sin6->sin6_scope_id =
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ntohs(ip6->ip6_src.s6_addr16[1]);
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}
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}
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if (saidx->dst.sin6.sin6_len == 0) {
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sin6 = (struct sockaddr_in6 *)&saidx->dst;
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sin6->sin6_len = sizeof(*sin6);
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = IPSEC_PORT_ANY;
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sin6->sin6_addr = ip6->ip6_dst;
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if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
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/* fix scope id for comparing SPD */
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sin6->sin6_addr.s6_addr16[1] = 0;
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sin6->sin6_scope_id =
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ntohs(ip6->ip6_dst.s6_addr16[1]);
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}
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}
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}
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}
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/*
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* Lookup SA and validate it.
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*/
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*error = key_checkrequest(isr, saidx);
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if (*error != 0) {
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/*
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* IPsec processing is required, but no SA found.
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* I assume that key_acquire() had been called
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* to get/establish the SA. Here I discard
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* this packet because it is responsibility for
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* upper layer to retransmit the packet.
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*/
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switch(af) {
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case AF_INET:
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IPSECSTAT_INC(ips_out_nosa);
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break;
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#ifdef INET6
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case AF_INET6:
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IPSEC6STAT_INC(ips_out_nosa);
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break;
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#endif
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}
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goto bad;
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}
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sav = isr->sav;
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if (sav == NULL) {
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IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
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("no SA found, but required; level %u",
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ipsec_get_reqlevel(isr)));
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IPSECREQUEST_UNLOCK(isr);
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isr = isr->next;
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/*
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* If isr is NULL, we found a 'use' policy w/o SA.
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* Return w/o error and w/o isr so we can drop out
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* and continue w/o IPsec processing.
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*/
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if (isr == NULL)
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return isr;
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IPSECREQUEST_LOCK(isr);
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goto again;
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}
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/*
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* Check system global policy controls.
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*/
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if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) ||
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(isr->saidx.proto == IPPROTO_AH && !V_ah_enable) ||
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(isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
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DPRINTF(("%s: IPsec outbound packet dropped due"
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" to policy (check your sysctls)\n", __func__));
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IPSEC_OSTAT(pdrops);
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*error = EHOSTUNREACH;
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goto bad;
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}
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|
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/*
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* Sanity check the SA contents for the caller
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* before they invoke the xform output method.
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*/
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if (sav->tdb_xform == NULL) {
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DPRINTF(("%s: no transform for SA\n", __func__));
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IPSEC_OSTAT(noxform);
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*error = EHOSTUNREACH;
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goto bad;
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}
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return isr;
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bad:
|
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IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
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IPSECREQUEST_UNLOCK(isr);
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return NULL;
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#undef IPSEC_OSTAT
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}
|
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|
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static int
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ipsec_encap(struct mbuf **mp, struct secasindex *saidx)
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{
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#ifdef INET6
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struct ip6_hdr *ip6;
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#endif
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struct ip *ip;
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int setdf;
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uint8_t itos, proto;
|
|
|
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ip = mtod(*mp, struct ip *);
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switch (ip->ip_v) {
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#ifdef INET
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case IPVERSION:
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proto = IPPROTO_IPIP;
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/*
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* Collect IP_DF state from the inner header
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|
* and honor system-wide control of how to handle it.
|
|
*/
|
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switch (V_ip4_ipsec_dfbit) {
|
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case 0: /* clear in outer header */
|
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case 1: /* set in outer header */
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setdf = V_ip4_ipsec_dfbit;
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break;
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default:/* propagate to outer header */
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setdf = (ip->ip_off & htons(IP_DF)) != 0;
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}
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itos = ip->ip_tos;
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break;
|
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#endif
|
|
#ifdef INET6
|
|
case (IPV6_VERSION >> 4):
|
|
proto = IPPROTO_IPV6;
|
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ip6 = mtod(*mp, struct ip6_hdr *);
|
|
itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
|
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setdf = V_ip4_ipsec_dfbit ? 1: 0;
|
|
/* scoped address handling */
|
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in6_clearscope(&ip6->ip6_src);
|
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in6_clearscope(&ip6->ip6_dst);
|
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break;
|
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#endif
|
|
default:
|
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return (EAFNOSUPPORT);
|
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}
|
|
switch (saidx->dst.sa.sa_family) {
|
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#ifdef INET
|
|
case AF_INET:
|
|
if (saidx->src.sa.sa_family != AF_INET ||
|
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saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
|
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saidx->dst.sin.sin_addr.s_addr == INADDR_ANY)
|
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return (EINVAL);
|
|
M_PREPEND(*mp, sizeof(struct ip), M_NOWAIT);
|
|
if (*mp == NULL)
|
|
return (ENOBUFS);
|
|
ip = mtod(*mp, struct ip *);
|
|
ip->ip_v = IPVERSION;
|
|
ip->ip_hl = sizeof(struct ip) >> 2;
|
|
ip->ip_p = proto;
|
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ip->ip_len = htons((*mp)->m_pkthdr.len);
|
|
ip->ip_ttl = V_ip_defttl;
|
|
ip->ip_sum = 0;
|
|
ip->ip_off = setdf ? htons(IP_DF): 0;
|
|
ip->ip_src = saidx->src.sin.sin_addr;
|
|
ip->ip_dst = saidx->dst.sin.sin_addr;
|
|
ip_ecn_ingress(V_ip4_ipsec_ecn, &ip->ip_tos, &itos);
|
|
ip_fillid(ip);
|
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break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (saidx->src.sa.sa_family != AF_INET6 ||
|
|
IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr) ||
|
|
IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr))
|
|
return (EINVAL);
|
|
M_PREPEND(*mp, sizeof(struct ip6_hdr), M_NOWAIT);
|
|
if (*mp == NULL)
|
|
return (ENOBUFS);
|
|
ip6 = mtod(*mp, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc = IPV6_VERSION;
|
|
ip6->ip6_hlim = V_ip6_defhlim;
|
|
ip6->ip6_nxt = proto;
|
|
ip6->ip6_dst = saidx->dst.sin6.sin6_addr;
|
|
/* For link-local address embed scope zone id */
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
|
|
ip6->ip6_dst.s6_addr16[1] =
|
|
htons(saidx->dst.sin6.sin6_scope_id & 0xffff);
|
|
ip6->ip6_src = saidx->src.sin6.sin6_addr;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
|
|
ip6->ip6_src.s6_addr16[1] =
|
|
htons(saidx->src.sin6.sin6_scope_id & 0xffff);
|
|
ip6->ip6_plen = htons((*mp)->m_pkthdr.len - sizeof(*ip6));
|
|
ip_ecn_ingress(V_ip6_ipsec_ecn, &proto, &itos);
|
|
ip6->ip6_flow |= htonl((uint32_t)proto << 20);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
return (EAFNOSUPPORT);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifdef INET
|
|
/*
|
|
* IPsec output logic for IPv4.
|
|
*/
|
|
int
|
|
ipsec4_process_packet(struct mbuf *m, struct ipsecrequest *isr)
|
|
{
|
|
char sbuf[INET6_ADDRSTRLEN], dbuf[INET6_ADDRSTRLEN];
|
|
struct ipsec_ctx_data ctx;
|
|
union sockaddr_union *dst;
|
|
struct secasindex saidx;
|
|
struct secasvar *sav;
|
|
struct ip *ip;
|
|
int error, i, off;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("null mbuf"));
|
|
IPSEC_ASSERT(isr != NULL, ("null isr"));
|
|
|
|
IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
|
|
|
|
isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
|
|
if (isr == NULL) {
|
|
if (error != 0)
|
|
goto bad;
|
|
return EJUSTRETURN;
|
|
}
|
|
|
|
sav = isr->sav;
|
|
if (m->m_len < sizeof(struct ip) &&
|
|
(m = m_pullup(m, sizeof (struct ip))) == NULL) {
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
|
|
IPSEC_INIT_CTX(&ctx, &m, sav, AF_INET, IPSEC_ENC_BEFORE);
|
|
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_OUT)) != 0)
|
|
goto bad;
|
|
|
|
ip = mtod(m, struct ip *);
|
|
dst = &sav->sah->saidx.dst;
|
|
/* Do the appropriate encapsulation, if necessary */
|
|
if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
|
|
dst->sa.sa_family != AF_INET || /* PF mismatch */
|
|
(dst->sa.sa_family == AF_INET && /* Proxy */
|
|
dst->sin.sin_addr.s_addr != INADDR_ANY &&
|
|
dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
|
|
/* Fix IPv4 header checksum and length */
|
|
ip->ip_len = htons(m->m_pkthdr.len);
|
|
ip->ip_sum = 0;
|
|
ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
|
|
error = ipsec_encap(&m, &sav->sah->saidx);
|
|
if (error != 0) {
|
|
DPRINTF(("%s: encapsulation for SA %s->%s "
|
|
"SPI 0x%08x failed with error %d\n", __func__,
|
|
ipsec_address(&sav->sah->saidx.src, sbuf,
|
|
sizeof(sbuf)),
|
|
ipsec_address(&sav->sah->saidx.dst, dbuf,
|
|
sizeof(dbuf)), ntohl(sav->spi), error));
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
IPSEC_INIT_CTX(&ctx, &m, sav, dst->sa.sa_family, IPSEC_ENC_AFTER);
|
|
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_OUT)) != 0)
|
|
goto bad;
|
|
|
|
/*
|
|
* Dispatch to the appropriate IPsec transform logic. The
|
|
* packet will be returned for transmission after crypto
|
|
* processing, etc. are completed.
|
|
*
|
|
* NB: m & sav are ``passed to caller'' who's responsible for
|
|
* for reclaiming their resources.
|
|
*/
|
|
switch(dst->sa.sa_family) {
|
|
case AF_INET:
|
|
ip = mtod(m, struct ip *);
|
|
i = ip->ip_hl << 2;
|
|
off = offsetof(struct ip, ip_p);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
i = sizeof(struct ip6_hdr);
|
|
off = offsetof(struct ip6_hdr, ip6_nxt);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
DPRINTF(("%s: unsupported protocol family %u\n",
|
|
__func__, dst->sa.sa_family));
|
|
error = EPFNOSUPPORT;
|
|
IPSECSTAT_INC(ips_out_inval);
|
|
goto bad;
|
|
}
|
|
error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
return (error);
|
|
bad:
|
|
if (isr)
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
if (m)
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef INET6
|
|
static int
|
|
in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia)
|
|
{
|
|
struct in6_addr ia2;
|
|
|
|
memcpy(&ia2, &sa->sin6_addr, sizeof(ia2));
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr))
|
|
ia2.s6_addr16[1] = htons(sa->sin6_scope_id);
|
|
|
|
return IN6_ARE_ADDR_EQUAL(ia, &ia2);
|
|
}
|
|
|
|
/*
|
|
* IPsec output logic for IPv6.
|
|
*/
|
|
int
|
|
ipsec6_process_packet(struct mbuf *m, struct ipsecrequest *isr)
|
|
{
|
|
char sbuf[INET6_ADDRSTRLEN], dbuf[INET6_ADDRSTRLEN];
|
|
struct ipsec_ctx_data ctx;
|
|
struct secasindex saidx;
|
|
struct secasvar *sav;
|
|
struct ip6_hdr *ip6;
|
|
int error, i, off;
|
|
union sockaddr_union *dst;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf"));
|
|
IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr"));
|
|
|
|
IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
|
|
|
|
isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
|
|
if (isr == NULL) {
|
|
if (error != 0)
|
|
goto bad;
|
|
return EJUSTRETURN;
|
|
}
|
|
sav = isr->sav;
|
|
dst = &sav->sah->saidx.dst;
|
|
|
|
IPSEC_INIT_CTX(&ctx, &m, sav, AF_INET6, IPSEC_ENC_BEFORE);
|
|
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_OUT)) != 0)
|
|
goto bad;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
|
|
|
|
/* Do the appropriate encapsulation, if necessary */
|
|
if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
|
|
dst->sa.sa_family != AF_INET6 || /* PF mismatch */
|
|
((dst->sa.sa_family == AF_INET6) &&
|
|
(!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) &&
|
|
(!in6_sa_equal_addrwithscope(&dst->sin6,
|
|
&ip6->ip6_dst)))) {
|
|
if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) {
|
|
/* No jumbogram support. */
|
|
error = ENXIO; /*XXX*/
|
|
goto bad;
|
|
}
|
|
error = ipsec_encap(&m, &sav->sah->saidx);
|
|
if (error != 0) {
|
|
DPRINTF(("%s: encapsulation for SA %s->%s "
|
|
"SPI 0x%08x failed with error %d\n", __func__,
|
|
ipsec_address(&sav->sah->saidx.src, sbuf,
|
|
sizeof(sbuf)),
|
|
ipsec_address(&sav->sah->saidx.dst, dbuf,
|
|
sizeof(dbuf)), ntohl(sav->spi), error));
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
IPSEC_INIT_CTX(&ctx, &m, sav, dst->sa.sa_family, IPSEC_ENC_AFTER);
|
|
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_OUT)) != 0)
|
|
goto bad;
|
|
|
|
switch(dst->sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
{
|
|
struct ip *ip;
|
|
ip = mtod(m, struct ip *);
|
|
i = ip->ip_hl << 2;
|
|
off = offsetof(struct ip, ip_p);
|
|
}
|
|
break;
|
|
#endif /* AF_INET */
|
|
case AF_INET6:
|
|
i = sizeof(struct ip6_hdr);
|
|
off = offsetof(struct ip6_hdr, ip6_nxt);
|
|
break;
|
|
default:
|
|
DPRINTF(("%s: unsupported protocol family %u\n",
|
|
__func__, dst->sa.sa_family));
|
|
error = EPFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
return error;
|
|
bad:
|
|
IPSEC6STAT_INC(ips_out_inval);
|
|
if (isr)
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
if (m)
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
#endif /*INET6*/
|