814 lines
20 KiB
C
814 lines
20 KiB
C
/* $NetBSD: ipsec_output.c,v 1.38 2012/01/10 20:01:57 drochner Exp $ */
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/*-
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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: /repoman/r/ncvs/src/sys/netipsec/ipsec_output.c,v 1.3.2.2 2003/03/28 20:32:53 sam Exp $
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ipsec_output.c,v 1.38 2012/01/10 20:01:57 drochner Exp $");
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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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#ifdef __FreeBSD__
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#include "opt_inet6.h"
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#endif
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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/syslog.h>
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#include <net/if.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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# ifdef __FreeBSD__
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# include <netinet6/ip6_ecn.h>
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# endif
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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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#ifdef IPSEC_NAT_T
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#include <netinet/udp.h>
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#endif
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#include <netipsec/ipsec.h>
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#include <netipsec/ipsec_var.h>
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#include <netipsec/ipsec_private.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 <netipsec/ipsec_osdep.h>
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#include <net/net_osdep.h> /* ovbcopy() in ipsec6_encapsulate() */
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/*
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* Add a IPSEC_OUT_DONE tag to mark that we have finished the ipsec processing
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* It will be used by ip{,6}_output to check if we have already or not
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* processed this packet.
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*/
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static int
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ipsec_register_done(struct mbuf *m, int * error)
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{
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struct m_tag *mtag;
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mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 0, M_NOWAIT);
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if (mtag == NULL) {
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DPRINTF(("ipsec_register_done: could not get packet tag\n"));
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*error = ENOMEM;
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return -1;
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}
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m_tag_prepend(m, mtag);
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return 0;
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}
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static int
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ipsec_reinject_ipstack(struct mbuf *m, int af)
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{
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#ifdef INET
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struct ip * ip;
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#endif /* INET */
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#if defined(INET) || defined(INET6)
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int rv;
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#endif
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switch (af) {
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#ifdef INET
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case AF_INET:
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ip = mtod(m, struct ip *);
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#ifdef __FreeBSD__
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/* FreeBSD ip_output() expects ip_len, ip_off in host endian */
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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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#endif /* __FreeBSD_ */
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KERNEL_LOCK(1, NULL);
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rv = ip_output(m, NULL, NULL, IP_RAWOUTPUT|IP_NOIPNEWID,
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NULL, NULL);
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KERNEL_UNLOCK_ONE(NULL);
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return rv;
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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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KERNEL_LOCK(1, NULL);
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rv = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
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KERNEL_UNLOCK_ONE(NULL);
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return rv;
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#endif /* INET6 */
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}
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panic("ipsec_reinject_ipstack : iunknown protocol family %u\n", af);
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return -1; /* NOTREACHED */
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}
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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 secasvar *sav;
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struct secasindex *saidx;
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int error;
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#ifdef INET
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struct ip * ip;
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#endif /* INET */
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#ifdef INET6
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struct ip6_hdr * ip6;
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#endif /* INET6 */
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#ifdef IPSEC_NAT_T
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struct mbuf * mo;
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struct udphdr *udp = NULL;
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uint64_t * data = NULL;
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int hlen, roff;
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#endif /* IPSEC_NAT_T */
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IPSEC_SPLASSERT_SOFTNET("ipsec_process_done");
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IPSEC_ASSERT(m != NULL, ("ipsec_process_done: null mbuf"));
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IPSEC_ASSERT(isr != NULL, ("ipsec_process_done: null ISR"));
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sav = isr->sav;
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IPSEC_ASSERT(sav != NULL, ("ipsec_process_done: null SA"));
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IPSEC_ASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH"));
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saidx = &sav->sah->saidx;
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#ifdef IPSEC_NAT_T
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if(sav->natt_type != 0) {
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ip = mtod(m, struct ip *);
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hlen = sizeof(struct udphdr);
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if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
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hlen += sizeof(uint64_t);
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mo = m_makespace(m, sizeof(struct ip), hlen, &roff);
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if (mo == NULL) {
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DPRINTF(("ipsec_process_done : failed to inject"
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"%u byte UDP for SA %s/%08lx\n",
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hlen, ipsec_address(&saidx->dst),
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(u_long) ntohl(sav->spi)));
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error = ENOBUFS;
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goto bad;
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}
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udp = (struct udphdr*) (mtod(mo, char*) + roff);
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data = (uint64_t*) (udp + 1);
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if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
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*data = 0; /* NON-IKE Marker */
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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 = key_portfromsaddr(&saidx->src);
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udp->uh_dport = key_portfromsaddr(&saidx->dst);
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udp->uh_sum = 0;
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udp->uh_ulen = htons(m->m_pkthdr.len - (ip->ip_hl << 2));
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}
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#endif /* IPSEC_NAT_T */
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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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ip = mtod(m, struct ip *);
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ip->ip_len = htons(m->m_pkthdr.len);
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#ifdef IPSEC_NAT_T
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if (sav->natt_type != 0)
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ip->ip_p = IPPROTO_UDP;
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#endif /* IPSEC_NAT_T */
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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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ip6 = mtod(m, struct ip6_hdr *);
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ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
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#ifdef IPSEC_NAT_T
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if (sav->natt_type != 0)
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ip6->ip6_nxt = IPPROTO_UDP;
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#endif /* IPSEC_NAT_T */
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break;
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#endif /* INET6 */
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default:
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DPRINTF(("ipsec_process_done: unknown protocol family %u\n",
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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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key_sa_recordxfer(sav, m);
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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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IPSEC_STATINC(IPSEC_STAT_OUT_BUNDLESA);
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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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return ipsec4_process_packet(m, isr->next, 0,0);
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#endif /* INET */
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#ifdef INET6
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case AF_INET6:
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return ipsec6_process_packet(m,isr->next);
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#endif /* INET6 */
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default :
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DPRINTF(("ipsec_process_done: unknown protocol family %u\n",
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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,
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* mark that we have already processed the packet
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* transmit it packet using the appropriate network protocol (IP or IPv6).
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*/
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if (ipsec_register_done(m, &error) < 0)
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goto bad;
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return ipsec_reinject_ipstack(m, saidx->dst.sa.sa_family);
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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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/*
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* ipsec_nextisr can return :
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* - isr == NULL and error != 0 => something is bad : the packet must be
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* discarded
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* - isr == NULL and error == 0 => no more rules to apply, ipsec processing
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* is done, reinject it in ip stack
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* - isr != NULL (error == 0) => we need to apply one rule to the packet
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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) \
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do { \
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switch (isr->saidx.proto) { \
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case IPPROTO_ESP: \
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ESP_STATINC(x); \
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break; \
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case IPPROTO_AH: \
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AH_STATINC(y); \
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break; \
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default: \
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IPCOMP_STATINC(z); \
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break; \
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} \
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} while (/*CONSTCOND*/0)
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struct secasvar *sav;
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IPSEC_SPLASSERT_SOFTNET("ipsec_nextisr");
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IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
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("ipsec_nextisr: 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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IPSEC_STATINC(IPSEC_STAT_OUT_NOSA);
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goto bad;
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}
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sav = isr->sav;
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/* sav may be NULL here if we have an USE rule */
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if (sav == NULL) {
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IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
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("ipsec_nextisr: no SA found, but required; level %u",
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ipsec_get_reqlevel(isr)));
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isr = isr->next;
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/*
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* No more rules to apply, return NULL isr and no error
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* It can happen when the last rules are USE rules
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* */
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if (isr == NULL) {
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*error = 0;
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return isr;
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}
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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(("ipsec_nextisr: IPsec outbound packet dropped due"
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" to policy (check your sysctls)\n"));
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IPSEC_OSTAT(ESP_STAT_PDROPS, AH_STAT_PDROPS,
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IPCOMP_STAT_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(("ipsec_nextisr: no transform for SA\n"));
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IPSEC_OSTAT(ESP_STAT_NOXFORM, AH_STAT_NOXFORM,
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IPCOMP_STAT_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, ("ipsec_nextisr: error return w/ no error code"));
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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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{
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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 s, error, i, off;
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IPSEC_ASSERT(m != NULL, ("ipsec4_process_packet: null mbuf"));
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IPSEC_ASSERT(isr != NULL, ("ipsec4_process_packet: null isr"));
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s = splsoftnet(); /* insure SA contents don't change */
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|
|
|
isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
|
|
if (isr == NULL) {
|
|
if (error != 0) {
|
|
goto bad;
|
|
} else {
|
|
if (ipsec_register_done(m, &error) < 0)
|
|
goto bad;
|
|
|
|
splx(s);
|
|
return ipsec_reinject_ipstack(m, AF_INET);
|
|
}
|
|
}
|
|
|
|
sav = isr->sav;
|
|
if (!tunalready) {
|
|
union sockaddr_union *dst = &sav->sah->saidx.dst;
|
|
int setdf;
|
|
|
|
/*
|
|
* Collect IP_DF state from the outer header.
|
|
*/
|
|
if (dst->sa.sa_family == AF_INET) {
|
|
if (m->m_len < sizeof (struct ip) &&
|
|
(m = m_pullup(m, sizeof (struct ip))) == NULL) {
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
/* Honor system-wide control of how to handle IP_DF */
|
|
switch (ip4_ipsec_dfbit) {
|
|
case 0: /* clear in outer header */
|
|
case 1: /* set in outer header */
|
|
setdf = ip4_ipsec_dfbit;
|
|
break;
|
|
default: /* propagate to outer header */
|
|
setdf = ip->ip_off;
|
|
#ifndef __FreeBSD__
|
|
/* On FreeBSD, ip_off and ip_len assumed in host endian. */
|
|
setdf = ntohs(setdf);
|
|
#endif
|
|
setdf = htons(setdf & IP_DF);
|
|
break;
|
|
}
|
|
} else {
|
|
ip = NULL; /* keep compiler happy */
|
|
setdf = 0;
|
|
}
|
|
/* Do the appropriate encapsulation, if necessary */
|
|
if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
|
|
dst->sa.sa_family != AF_INET || /* PF mismatch */
|
|
#if 0
|
|
(sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
|
|
sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
|
|
#endif
|
|
(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)) {
|
|
struct mbuf *mp;
|
|
|
|
/* Fix IPv4 header checksum and length */
|
|
if (m->m_len < sizeof (struct ip) &&
|
|
(m = m_pullup(m, sizeof (struct ip))) == NULL) {
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
ip->ip_len = htons(m->m_pkthdr.len);
|
|
ip->ip_sum = 0;
|
|
ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
|
|
|
|
/* Encapsulate the packet */
|
|
error = ipip_output(m, isr, &mp, 0, 0);
|
|
if (mp == NULL && !error) {
|
|
/* Should never happen. */
|
|
DPRINTF(("ipsec4_process_packet: ipip_output "
|
|
"returns no mbuf and no error!"));
|
|
error = EFAULT;
|
|
}
|
|
if (error) {
|
|
if (mp) {
|
|
/* XXX: Should never happen! */
|
|
m_freem(mp);
|
|
}
|
|
m = NULL; /* ipip_output() already freed it */
|
|
goto bad;
|
|
}
|
|
m = mp, mp = NULL;
|
|
/*
|
|
* ipip_output clears IP_DF in the new header. If
|
|
* we need to propagate IP_DF from the outer header,
|
|
* then we have to do it here.
|
|
*
|
|
* XXX shouldn't assume what ipip_output does.
|
|
*/
|
|
if (dst->sa.sa_family == AF_INET && setdf) {
|
|
if (m->m_len < sizeof (struct ip) &&
|
|
(m = m_pullup(m, sizeof (struct ip))) == NULL) {
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
ip->ip_off |= IP_OFF_CONVERT(IP_DF);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Dispatch to the appropriate IPsec transform logic. The
|
|
* packet will be returned for transmission after crypto
|
|
* processing, etc. are completed. For encapsulation we
|
|
* bypass this call because of the explicit call done above
|
|
* (necessary to deal with IP_DF handling for IPv4).
|
|
*
|
|
* NB: m & sav are ``passed to caller'' who's reponsible for
|
|
* for reclaiming their resources.
|
|
*/
|
|
if (sav->tdb_xform->xf_type != XF_IP4) {
|
|
union sockaddr_union *dst = &sav->sah->saidx.dst;
|
|
if (dst->sa.sa_family == AF_INET) {
|
|
ip = mtod(m, struct ip *);
|
|
i = ip->ip_hl << 2;
|
|
off = offsetof(struct ip, ip_p);
|
|
} else {
|
|
i = sizeof(struct ip6_hdr);
|
|
off = offsetof(struct ip6_hdr, ip6_nxt);
|
|
}
|
|
error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
|
|
} else {
|
|
error = ipsec_process_done(m, isr);
|
|
}
|
|
splx(s);
|
|
return error;
|
|
bad:
|
|
splx(s);
|
|
if (m)
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
static void
|
|
compute_ipsec_pos(struct mbuf *m, int *i, int *off)
|
|
{
|
|
int nxt;
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr*);
|
|
struct ip6_ext ip6e;
|
|
int dstopt = 0;
|
|
|
|
*i = sizeof(struct ip6_hdr);
|
|
*off = offsetof(struct ip6_hdr, ip6_nxt);
|
|
nxt = ip6->ip6_nxt;
|
|
|
|
/*
|
|
* chase mbuf chain to find the appropriate place to
|
|
* put AH/ESP/IPcomp header.
|
|
* IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
|
|
*/
|
|
do {
|
|
switch (nxt) {
|
|
case IPPROTO_AH:
|
|
case IPPROTO_ESP:
|
|
case IPPROTO_IPCOMP:
|
|
/*
|
|
* we should not skip security header added
|
|
* beforehand.
|
|
*/
|
|
return;
|
|
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_DSTOPTS:
|
|
case IPPROTO_ROUTING:
|
|
/*
|
|
* if we see 2nd destination option header,
|
|
* we should stop there.
|
|
*/
|
|
if (nxt == IPPROTO_DSTOPTS && dstopt)
|
|
return;
|
|
|
|
if (nxt == IPPROTO_DSTOPTS) {
|
|
/*
|
|
* seen 1st or 2nd destination option.
|
|
* next time we see one, it must be 2nd.
|
|
*/
|
|
dstopt = 1;
|
|
} else if (nxt == IPPROTO_ROUTING) {
|
|
/*
|
|
* if we see destionation option next
|
|
* time, it must be dest2.
|
|
*/
|
|
dstopt = 2;
|
|
}
|
|
|
|
/* skip this header */
|
|
m_copydata(m, *i, sizeof(ip6e), &ip6e);
|
|
nxt = ip6e.ip6e_nxt;
|
|
*off = *i + offsetof(struct ip6_ext, ip6e_nxt);
|
|
/*
|
|
* we will never see nxt == IPPROTO_AH
|
|
* so it is safe to omit AH case.
|
|
*/
|
|
*i += (ip6e.ip6e_len + 1) << 3;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
} while (*i < m->m_pkthdr.len);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
int
|
|
ipsec6_process_packet(
|
|
struct mbuf *m,
|
|
struct ipsecrequest *isr
|
|
)
|
|
{
|
|
struct secasindex saidx;
|
|
struct secasvar *sav;
|
|
struct ip6_hdr *ip6;
|
|
int s, 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"));
|
|
|
|
s = splsoftnet(); /* insure SA contents don't change */
|
|
|
|
isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
|
|
if (isr == NULL) {
|
|
if (error != 0) {
|
|
/* XXX Should we send a notification ? */
|
|
goto bad;
|
|
} else {
|
|
if (ipsec_register_done(m, &error) < 0)
|
|
goto bad;
|
|
|
|
splx(s);
|
|
return ipsec_reinject_ipstack(m, AF_INET6);
|
|
}
|
|
}
|
|
|
|
sav = isr->sav;
|
|
dst = &sav->sah->saidx.dst;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *); /* XXX */
|
|
|
|
/* 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)))) {
|
|
struct mbuf *mp;
|
|
|
|
/* Fix IPv6 header payload length. */
|
|
if (m->m_len < sizeof(struct ip6_hdr))
|
|
if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL)
|
|
return ENOBUFS;
|
|
|
|
if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) {
|
|
/* No jumbogram support. */
|
|
m_freem(m);
|
|
return ENXIO; /*XXX*/
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
|
|
|
|
/* Encapsulate the packet */
|
|
error = ipip_output(m, isr, &mp, 0, 0);
|
|
if (mp == NULL && !error) {
|
|
/* Should never happen. */
|
|
DPRINTF(("ipsec6_process_packet: ipip_output "
|
|
"returns no mbuf and no error!"));
|
|
error = EFAULT;
|
|
}
|
|
|
|
if (error) {
|
|
if (mp) {
|
|
/* XXX: Should never happen! */
|
|
m_freem(mp);
|
|
}
|
|
m = NULL; /* ipip_output() already freed it */
|
|
goto bad;
|
|
}
|
|
|
|
m = mp;
|
|
mp = NULL;
|
|
}
|
|
|
|
if (dst->sa.sa_family == AF_INET) {
|
|
struct ip *ip;
|
|
ip = mtod(m, struct ip *);
|
|
i = ip->ip_hl << 2;
|
|
off = offsetof(struct ip, ip_p);
|
|
} else {
|
|
compute_ipsec_pos(m, &i, &off);
|
|
}
|
|
error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
|
|
splx(s);
|
|
return error;
|
|
bad:
|
|
splx(s);
|
|
if (m)
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
#endif /*INET6*/
|