1 /* $FreeBSD: src/sys/netinet6/ipcomp_input.c,v 1.1.2.3 2002/04/28 05:40:27 suz Exp $ */
2 /* $DragonFly: src/sys/netinet6/ipcomp_input.c,v 1.4 2003/08/07 21:54:33 dillon Exp $ */
3 /* $KAME: ipcomp_input.c,v 1.25 2001/03/01 09:12:09 itojun Exp $ */
6 * Copyright (C) 1999 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * RFC2393 IP payload compression protocol (IPComp).
39 #include "opt_inet6.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/domain.h>
45 #include <sys/protosw.h>
46 #include <sys/socket.h>
47 #include <sys/errno.h>
49 #include <sys/syslog.h>
52 #include <net/route.h>
53 #include <net/netisr.h>
55 #include <machine/cpu.h>
57 #include <netinet/in.h>
58 #include <netinet/in_systm.h>
59 #include <netinet/in_var.h>
60 #include <netinet/ip.h>
61 #include <netinet/ip_var.h>
62 #include <netinet/ip_ecn.h>
65 #include <netinet/ip6.h>
66 #include <netinet6/ip6_var.h>
68 #include <netinet6/ipcomp.h>
70 #include <netinet6/ipcomp6.h>
73 #include <netinet6/ipsec.h>
75 #include <netinet6/ipsec6.h>
77 #include <netproto/key/key.h>
78 #include <netproto/key/keydb.h>
80 #include <machine/stdarg.h>
82 #include <net/net_osdep.h>
87 #include <netinet/ipprotosw.h>
88 extern struct ipprotosw inetsw[];
91 ipcomp4_input(struct mbuf *m, int off, int proto)
95 struct ipcomp *ipcomp;
96 const struct ipcomp_algorithm *algo;
97 u_int16_t cpi; /* host order */
102 struct secasvar *sav = NULL;
104 if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
105 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
106 "(packet too short)\n"));
107 ipsecstat.in_inval++;
111 md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
113 m = NULL; /* already freed */
114 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
115 "(pulldown failure)\n"));
116 ipsecstat.in_inval++;
119 ipcomp = mtod(md, struct ipcomp *);
120 ip = mtod(m, struct ip *);
121 nxt = ipcomp->comp_nxt;
123 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
125 hlen = ip->ip_hl << 2;
128 cpi = ntohs(ipcomp->comp_cpi);
130 if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
131 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
132 (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
134 && (sav->state == SADB_SASTATE_MATURE
135 || sav->state == SADB_SASTATE_DYING)) {
136 cpi = sav->alg_enc; /* XXX */
137 /* other parameters to look at? */
140 algo = ipcomp_algorithm_lookup(cpi);
142 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
148 /* chop ipcomp header */
150 md->m_data += sizeof(struct ipcomp);
151 md->m_len -= sizeof(struct ipcomp);
152 m->m_pkthdr.len -= sizeof(struct ipcomp);
154 ip->ip_len -= sizeof(struct ipcomp);
156 ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
159 olen = m->m_pkthdr.len;
160 newlen = m->m_pkthdr.len - off;
161 error = (*algo->decompress)(m, m->m_next, &newlen);
164 ipsecstat.in_inval++;
165 else if (error == ENOBUFS)
166 ipsecstat.in_nomem++;
170 ipsecstat.in_comphist[cpi]++;
173 * returning decompressed packet onto icmp is meaningless.
174 * mark it decrypted to prevent icmp from attaching original packet.
176 m->m_flags |= M_DECRYPTED;
178 m->m_pkthdr.len = off + newlen;
179 ip = mtod(m, struct ip *);
185 len = ntohs(ip->ip_len);
188 * be careful about underflow. also, do not assign exact value
189 * as ip_len is manipulated differently on *BSDs.
191 len += m->m_pkthdr.len;
194 /* packet too big after decompress */
195 ipsecstat.in_inval++;
199 ip->ip_len = len & 0xffff;
201 ip->ip_len = htons(len & 0xffff);
207 key_sa_recordxfer(sav, m);
208 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
209 ipsecstat.in_nomem++;
216 if (nxt != IPPROTO_DONE) {
217 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
218 ipsec4_in_reject(m, NULL)) {
219 ipsecstat.in_polvio++;
222 (*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
227 ipsecstat.in_success++;
241 ipcomp6_input(mp, offp, proto)
248 struct ipcomp *ipcomp;
249 const struct ipcomp_algorithm *algo;
250 u_int16_t cpi; /* host order */
254 struct secasvar *sav = NULL;
260 md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
262 m = NULL; /* already freed */
263 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
264 "(pulldown failure)\n"));
265 ipsec6stat.in_inval++;
268 ipcomp = mtod(md, struct ipcomp *);
269 ip6 = mtod(m, struct ip6_hdr *);
270 nxt = ipcomp->comp_nxt;
272 cpi = ntohs(ipcomp->comp_cpi);
274 if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
275 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
276 (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
278 && (sav->state == SADB_SASTATE_MATURE
279 || sav->state == SADB_SASTATE_DYING)) {
280 cpi = sav->alg_enc; /* XXX */
281 /* other parameters to look at? */
284 algo = ipcomp_algorithm_lookup(cpi);
286 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
287 "dropping the packet for simplicity\n", cpi));
288 ipsec6stat.in_nosa++;
292 /* chop ipcomp header */
294 md->m_data += sizeof(struct ipcomp);
295 md->m_len -= sizeof(struct ipcomp);
296 m->m_pkthdr.len -= sizeof(struct ipcomp);
298 newlen = m->m_pkthdr.len - off;
299 error = (*algo->decompress)(m, md, &newlen);
302 ipsec6stat.in_inval++;
303 else if (error == ENOBUFS)
304 ipsec6stat.in_nomem++;
308 ipsec6stat.in_comphist[cpi]++;
309 m->m_pkthdr.len = off + newlen;
312 * returning decompressed packet onto icmp is meaningless.
313 * mark it decrypted to prevent icmp from attaching original packet.
315 m->m_flags |= M_DECRYPTED;
317 /* update next header field */
318 prvnxtp = ip6_get_prevhdr(m, off);
322 * no need to adjust payload length, as all the IPv6 protocols
323 * look at m->m_pkthdr.len
327 key_sa_recordxfer(sav, m);
328 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
329 ipsec6stat.in_nomem++;
337 ipsec6stat.in_success++;