825 lines
21 KiB
C
825 lines
21 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 "opt_enc.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/syslog.h>
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#include <net/if.h>
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#include <net/pfil.h>
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#include <net/route.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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#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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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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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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/*
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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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ipsec4stat.ips_out_bundlesa++;
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return ipsec4_process_packet(m, isr->next, 0, 0);
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}
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key_sa_recordxfer(sav, m); /* record data transfer */
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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). SPD lookup will be
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* performed again there.
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*/
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switch (saidx->dst.sa.sa_family) {
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#ifdef INET
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struct ip *ip;
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case AF_INET:
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ip = mtod(m, struct ip *);
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ip->ip_len = ntohs(ip->ip_len);
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ip->ip_off = ntohs(ip->ip_off);
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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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KEY_FREESAV(&sav);
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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(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \
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isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++)
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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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ipsec4stat.ips_out_nosa++;
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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 && !esp_enable) ||
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(isr->saidx.proto == IPPROTO_AH && !ah_enable) ||
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(isr->saidx.proto == IPPROTO_IPCOMP && !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(espstat.esps_pdrops, ahstat.ahs_pdrops,
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ipcompstat.ipcomps_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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* 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(espstat.esps_noxform, ahstat.ahs_noxform,
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ipcompstat.ipcomps_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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#ifdef INET
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/*
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* IPsec output logic for IPv4.
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*/
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int
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ipsec4_process_packet(
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struct mbuf *m,
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struct ipsecrequest *isr,
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int flags,
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int tunalready)
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{
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struct secasindex saidx;
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struct secasvar *sav;
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struct ip *ip;
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int error, i, off;
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IPSEC_ASSERT(m != NULL, ("null mbuf"));
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IPSEC_ASSERT(isr != NULL, ("null isr"));
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IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
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isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
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if (isr == NULL) {
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if (error != 0)
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goto bad;
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return EJUSTRETURN;
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}
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sav = isr->sav;
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#ifdef DEV_ENC
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/* pass the mbuf to enc0 for bpf processing */
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ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE);
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/* pass the mbuf to enc0 for packet filtering */
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if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
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goto bad;
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#endif
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if (!tunalready) {
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union sockaddr_union *dst = &sav->sah->saidx.dst;
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int setdf;
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/*
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* Collect IP_DF state from the outer header.
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*/
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if (dst->sa.sa_family == AF_INET) {
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if (m->m_len < sizeof (struct ip) &&
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(m = m_pullup(m, sizeof (struct ip))) == NULL) {
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error = ENOBUFS;
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goto bad;
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}
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ip = mtod(m, struct ip *);
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/* Honor system-wide control of how to handle IP_DF */
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switch (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 = ip4_ipsec_dfbit;
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break;
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default: /* propagate to outer header */
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setdf = ntohs(ip->ip_off & IP_DF);
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break;
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}
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} else {
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ip = NULL; /* keep compiler happy */
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setdf = 0;
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}
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/* Do the appropriate encapsulation, if necessary */
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if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
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dst->sa.sa_family != AF_INET || /* PF mismatch */
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#if 0
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(sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
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sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
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#endif
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(dst->sa.sa_family == AF_INET && /* Proxy */
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dst->sin.sin_addr.s_addr != INADDR_ANY &&
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dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
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struct mbuf *mp;
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/* Fix IPv4 header checksum and length */
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if (m->m_len < sizeof (struct ip) &&
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(m = m_pullup(m, sizeof (struct ip))) == NULL) {
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error = ENOBUFS;
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goto bad;
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}
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ip = mtod(m, struct ip *);
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ip->ip_len = htons(m->m_pkthdr.len);
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ip->ip_sum = 0;
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#ifdef _IP_VHL
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if (ip->ip_vhl == IP_VHL_BORING)
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ip->ip_sum = in_cksum_hdr(ip);
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else
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ip->ip_sum = in_cksum(m,
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_IP_VHL_HL(ip->ip_vhl) << 2);
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#else
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ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
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#endif
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/* Encapsulate the packet */
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error = ipip_output(m, isr, &mp, 0, 0);
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if (mp == NULL && !error) {
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/* Should never happen. */
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DPRINTF(("%s: ipip_output returns no mbuf and "
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"no error!", __func__));
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error = EFAULT;
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}
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if (error) {
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if (mp) {
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/* XXX: Should never happen! */
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m_freem(mp);
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}
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m = NULL; /* ipip_output() already freed it */
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goto bad;
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}
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m = mp, mp = NULL;
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/*
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* ipip_output clears IP_DF in the new header. If
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* we need to propagate IP_DF from the outer header,
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* then we have to do it here.
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*
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* XXX shouldn't assume what ipip_output does.
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*/
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if (dst->sa.sa_family == AF_INET && setdf) {
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if (m->m_len < sizeof (struct ip) &&
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(m = m_pullup(m, sizeof (struct ip))) == NULL) {
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error = ENOBUFS;
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goto bad;
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}
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ip = mtod(m, struct ip *);
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ip->ip_off = ntohs(ip->ip_off);
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ip->ip_off |= IP_DF;
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ip->ip_off = htons(ip->ip_off);
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}
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}
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}
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#ifdef DEV_ENC
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/* pass the mbuf to enc0 for bpf processing */
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ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER);
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/* pass the mbuf to enc0 for packet filtering */
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if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
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goto bad;
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#endif
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/*
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* Dispatch to the appropriate IPsec transform logic. The
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* packet will be returned for transmission after crypto
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* processing, etc. are completed. For encapsulation we
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* bypass this call because of the explicit call done above
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* (necessary to deal with IP_DF handling for IPv4).
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*
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* NB: m & sav are ``passed to caller'' who's reponsible for
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* for reclaiming their resources.
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*/
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if (sav->tdb_xform->xf_type != XF_IP4) {
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ip = mtod(m, struct ip *);
|
|
i = ip->ip_hl << 2;
|
|
off = offsetof(struct ip, ip_p);
|
|
error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
|
|
} else {
|
|
error = ipsec_process_done(m, isr);
|
|
}
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
return error;
|
|
bad:
|
|
if (isr)
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
if (m)
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
/*
|
|
* Chop IP6 header from the payload.
|
|
*/
|
|
static struct mbuf *
|
|
ipsec6_splithdr(struct mbuf *m)
|
|
{
|
|
struct mbuf *mh;
|
|
struct ip6_hdr *ip6;
|
|
int hlen;
|
|
|
|
IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr),
|
|
("first mbuf too short, len %u", m->m_len));
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
hlen = sizeof(struct ip6_hdr);
|
|
if (m->m_len > hlen) {
|
|
MGETHDR(mh, M_DONTWAIT, MT_DATA);
|
|
if (!mh) {
|
|
m_freem(m);
|
|
return NULL;
|
|
}
|
|
M_MOVE_PKTHDR(mh, m);
|
|
MH_ALIGN(mh, hlen);
|
|
m->m_len -= hlen;
|
|
m->m_data += hlen;
|
|
mh->m_next = m;
|
|
m = mh;
|
|
m->m_len = hlen;
|
|
bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
|
|
} else if (m->m_len < hlen) {
|
|
m = m_pullup(m, hlen);
|
|
if (!m)
|
|
return NULL;
|
|
}
|
|
return m;
|
|
}
|
|
|
|
/*
|
|
* IPsec output logic for IPv6, transport mode.
|
|
*/
|
|
int
|
|
ipsec6_output_trans(
|
|
struct ipsec_output_state *state,
|
|
u_char *nexthdrp,
|
|
struct mbuf *mprev,
|
|
struct secpolicy *sp,
|
|
int flags,
|
|
int *tun)
|
|
{
|
|
struct ipsecrequest *isr;
|
|
struct secasindex saidx;
|
|
int error = 0;
|
|
struct mbuf *m;
|
|
|
|
IPSEC_ASSERT(state != NULL, ("null state"));
|
|
IPSEC_ASSERT(state->m != NULL, ("null m"));
|
|
IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp"));
|
|
IPSEC_ASSERT(mprev != NULL, ("null mprev"));
|
|
IPSEC_ASSERT(sp != NULL, ("null sp"));
|
|
IPSEC_ASSERT(tun != NULL, ("null tun"));
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
|
|
printf("%s: applied SP\n", __func__);
|
|
kdebug_secpolicy(sp));
|
|
|
|
isr = sp->req;
|
|
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
|
|
/* the rest will be handled by ipsec6_output_tunnel() */
|
|
*tun = 1; /* need tunnel-mode processing */
|
|
return 0;
|
|
}
|
|
|
|
*tun = 0;
|
|
m = state->m;
|
|
|
|
IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
|
|
isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
|
|
if (isr == NULL) {
|
|
if (error != 0) {
|
|
#ifdef notdef
|
|
/* XXX should notification be done for all errors ? */
|
|
/*
|
|
* Notify the fact that the packet is discarded
|
|
* to ourselves. I believe this is better than
|
|
* just silently discarding. (jinmei@kame.net)
|
|
* XXX: should we restrict the error to TCP packets?
|
|
* XXX: should we directly notify sockets via
|
|
* pfctlinputs?
|
|
*/
|
|
icmp6_error(m, ICMP6_DST_UNREACH,
|
|
ICMP6_DST_UNREACH_ADMIN, 0);
|
|
m = NULL; /* NB: icmp6_error frees mbuf */
|
|
#endif
|
|
goto bad;
|
|
}
|
|
return EJUSTRETURN;
|
|
}
|
|
|
|
error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
|
|
sizeof (struct ip6_hdr),
|
|
offsetof(struct ip6_hdr,
|
|
ip6_nxt));
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
return error;
|
|
bad:
|
|
if (isr)
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
if (m)
|
|
m_freem(m);
|
|
state->m = NULL;
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav)
|
|
{
|
|
struct ip6_hdr *oip6;
|
|
struct ip6_hdr *ip6;
|
|
size_t plen;
|
|
|
|
/* can't tunnel between different AFs */
|
|
if (sav->sah->saidx.src.sa.sa_family != AF_INET6 ||
|
|
sav->sah->saidx.dst.sa.sa_family != AF_INET6) {
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr),
|
|
("mbuf wrong size; len %u", m->m_len));
|
|
|
|
|
|
/*
|
|
* grow the mbuf to accomodate the new IPv6 header.
|
|
*/
|
|
plen = m->m_pkthdr.len;
|
|
if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
|
|
struct mbuf *n;
|
|
MGET(n, M_DONTWAIT, MT_DATA);
|
|
if (!n) {
|
|
m_freem(m);
|
|
return ENOBUFS;
|
|
}
|
|
n->m_len = sizeof(struct ip6_hdr);
|
|
n->m_next = m->m_next;
|
|
m->m_next = n;
|
|
m->m_pkthdr.len += sizeof(struct ip6_hdr);
|
|
oip6 = mtod(n, struct ip6_hdr *);
|
|
} else {
|
|
m->m_next->m_len += sizeof(struct ip6_hdr);
|
|
m->m_next->m_data -= sizeof(struct ip6_hdr);
|
|
m->m_pkthdr.len += sizeof(struct ip6_hdr);
|
|
oip6 = mtod(m->m_next, struct ip6_hdr *);
|
|
}
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
|
|
|
|
/* Fake link-local scope-class addresses */
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
|
|
oip6->ip6_src.s6_addr16[1] = 0;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
|
|
oip6->ip6_dst.s6_addr16[1] = 0;
|
|
|
|
/* construct new IPv6 header. see RFC 2401 5.1.2.2 */
|
|
/* ECN consideration. */
|
|
ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
|
|
if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
|
|
ip6->ip6_plen = htons(plen);
|
|
else {
|
|
/* ip6->ip6_plen will be updated in ip6_output() */
|
|
}
|
|
ip6->ip6_nxt = IPPROTO_IPV6;
|
|
ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr;
|
|
ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr;
|
|
ip6->ip6_hlim = IPV6_DEFHLIM;
|
|
|
|
/* XXX Should ip6_src be updated later ? */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* IPsec output logic for IPv6, tunnel mode.
|
|
*/
|
|
int
|
|
ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags)
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
struct ipsecrequest *isr;
|
|
struct secasindex saidx;
|
|
int error;
|
|
struct sockaddr_in6* dst6;
|
|
struct mbuf *m;
|
|
|
|
IPSEC_ASSERT(state != NULL, ("null state"));
|
|
IPSEC_ASSERT(state->m != NULL, ("null m"));
|
|
IPSEC_ASSERT(sp != NULL, ("null sp"));
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
|
|
printf("%s: applied SP\n", __func__);
|
|
kdebug_secpolicy(sp));
|
|
|
|
m = state->m;
|
|
/*
|
|
* transport mode ipsec (before the 1st tunnel mode) is already
|
|
* processed by ipsec6_output_trans().
|
|
*/
|
|
for (isr = sp->req; isr; isr = isr->next) {
|
|
if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
|
|
break;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#ifdef DEV_ENC
|
|
/* pass the mbuf to enc0 for bpf processing */
|
|
ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE);
|
|
/* pass the mbuf to enc0 for packet filtering */
|
|
if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
|
|
goto bad;
|
|
#endif
|
|
|
|
/*
|
|
* There may be the case that SA status will be changed when
|
|
* we are refering to one. So calling splsoftnet().
|
|
*/
|
|
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
|
|
/*
|
|
* build IPsec tunnel.
|
|
*/
|
|
/* XXX should be processed with other familiy */
|
|
if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) {
|
|
ipseclog((LOG_ERR, "%s: family mismatched between "
|
|
"inner and outer, spi=%u\n", __func__,
|
|
ntohl(isr->sav->spi)));
|
|
ipsec6stat.ips_out_inval++;
|
|
error = EAFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
|
|
m = ipsec6_splithdr(m);
|
|
if (!m) {
|
|
ipsec6stat.ips_out_nomem++;
|
|
error = ENOMEM;
|
|
goto bad;
|
|
}
|
|
error = ipsec6_encapsulate(m, isr->sav);
|
|
if (error) {
|
|
m = NULL;
|
|
goto bad;
|
|
}
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
state->ro = &isr->sav->sah->sa_route;
|
|
state->dst = (struct sockaddr *)&state->ro->ro_dst;
|
|
dst6 = (struct sockaddr_in6 *)state->dst;
|
|
if (state->ro->ro_rt
|
|
&& ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
|
|
|| !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
|
|
RTFREE(state->ro->ro_rt);
|
|
state->ro->ro_rt = NULL;
|
|
}
|
|
if (state->ro->ro_rt == 0) {
|
|
bzero(dst6, sizeof(*dst6));
|
|
dst6->sin6_family = AF_INET6;
|
|
dst6->sin6_len = sizeof(*dst6);
|
|
dst6->sin6_addr = ip6->ip6_dst;
|
|
rtalloc(state->ro);
|
|
}
|
|
if (state->ro->ro_rt == 0) {
|
|
ip6stat.ip6s_noroute++;
|
|
ipsec6stat.ips_out_noroute++;
|
|
error = EHOSTUNREACH;
|
|
goto bad;
|
|
}
|
|
|
|
/* adjust state->dst if tunnel endpoint is offlink */
|
|
if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
|
|
state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
|
|
dst6 = (struct sockaddr_in6 *)state->dst;
|
|
}
|
|
}
|
|
|
|
m = ipsec6_splithdr(m);
|
|
if (!m) {
|
|
ipsec6stat.ips_out_nomem++;
|
|
error = ENOMEM;
|
|
goto bad;
|
|
}
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
#ifdef DEV_ENC
|
|
/* pass the mbuf to enc0 for bpf processing */
|
|
ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER);
|
|
/* pass the mbuf to enc0 for packet filtering */
|
|
if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
|
|
goto bad;
|
|
#endif
|
|
|
|
error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
|
|
sizeof (struct ip6_hdr),
|
|
offsetof(struct ip6_hdr, ip6_nxt));
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
return error;
|
|
bad:
|
|
if (isr)
|
|
IPSECREQUEST_UNLOCK(isr);
|
|
if (m)
|
|
m_freem(m);
|
|
state->m = NULL;
|
|
return error;
|
|
}
|
|
#endif /*INET6*/
|