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 1.2 2003/06/17 04:28:52 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 <netkey/key.h>
78 #include <netkey/keydb.h>
80 #include <machine/stdarg.h>
82 #include <net/net_osdep.h>
87 #include <netinet/ipprotosw.h>
88 extern struct ipprotosw inetsw[];
92 ipcomp4_input(struct mbuf *m, ...)
94 ipcomp4_input(m, va_alist)
101 struct ipcomp *ipcomp;
102 const struct ipcomp_algorithm *algo;
103 u_int16_t cpi; /* host order */
108 struct secasvar *sav = NULL;
113 off = va_arg(ap, int);
114 proto = va_arg(ap, int);
117 if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
118 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
119 "(packet too short)\n"));
120 ipsecstat.in_inval++;
124 md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
126 m = NULL; /* already freed */
127 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
128 "(pulldown failure)\n"));
129 ipsecstat.in_inval++;
132 ipcomp = mtod(md, struct ipcomp *);
133 ip = mtod(m, struct ip *);
134 nxt = ipcomp->comp_nxt;
136 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
138 hlen = ip->ip_hl << 2;
141 cpi = ntohs(ipcomp->comp_cpi);
143 if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
144 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
145 (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
147 && (sav->state == SADB_SASTATE_MATURE
148 || sav->state == SADB_SASTATE_DYING)) {
149 cpi = sav->alg_enc; /* XXX */
150 /* other parameters to look at? */
153 algo = ipcomp_algorithm_lookup(cpi);
155 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
161 /* chop ipcomp header */
163 md->m_data += sizeof(struct ipcomp);
164 md->m_len -= sizeof(struct ipcomp);
165 m->m_pkthdr.len -= sizeof(struct ipcomp);
167 ip->ip_len -= sizeof(struct ipcomp);
169 ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
172 olen = m->m_pkthdr.len;
173 newlen = m->m_pkthdr.len - off;
174 error = (*algo->decompress)(m, m->m_next, &newlen);
177 ipsecstat.in_inval++;
178 else if (error == ENOBUFS)
179 ipsecstat.in_nomem++;
183 ipsecstat.in_comphist[cpi]++;
186 * returning decompressed packet onto icmp is meaningless.
187 * mark it decrypted to prevent icmp from attaching original packet.
189 m->m_flags |= M_DECRYPTED;
191 m->m_pkthdr.len = off + newlen;
192 ip = mtod(m, struct ip *);
198 len = ntohs(ip->ip_len);
201 * be careful about underflow. also, do not assign exact value
202 * as ip_len is manipulated differently on *BSDs.
204 len += m->m_pkthdr.len;
207 /* packet too big after decompress */
208 ipsecstat.in_inval++;
212 ip->ip_len = len & 0xffff;
214 ip->ip_len = htons(len & 0xffff);
220 key_sa_recordxfer(sav, m);
221 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
222 ipsecstat.in_nomem++;
229 if (nxt != IPPROTO_DONE) {
230 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
231 ipsec4_in_reject(m, NULL)) {
232 ipsecstat.in_polvio++;
235 (*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
240 ipsecstat.in_success++;
254 ipcomp6_input(mp, offp, proto)
261 struct ipcomp *ipcomp;
262 const struct ipcomp_algorithm *algo;
263 u_int16_t cpi; /* host order */
267 struct secasvar *sav = NULL;
273 md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
275 m = NULL; /* already freed */
276 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
277 "(pulldown failure)\n"));
278 ipsec6stat.in_inval++;
281 ipcomp = mtod(md, struct ipcomp *);
282 ip6 = mtod(m, struct ip6_hdr *);
283 nxt = ipcomp->comp_nxt;
285 cpi = ntohs(ipcomp->comp_cpi);
287 if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
288 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
289 (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
291 && (sav->state == SADB_SASTATE_MATURE
292 || sav->state == SADB_SASTATE_DYING)) {
293 cpi = sav->alg_enc; /* XXX */
294 /* other parameters to look at? */
297 algo = ipcomp_algorithm_lookup(cpi);
299 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
300 "dropping the packet for simplicity\n", cpi));
301 ipsec6stat.in_nosa++;
305 /* chop ipcomp header */
307 md->m_data += sizeof(struct ipcomp);
308 md->m_len -= sizeof(struct ipcomp);
309 m->m_pkthdr.len -= sizeof(struct ipcomp);
311 newlen = m->m_pkthdr.len - off;
312 error = (*algo->decompress)(m, md, &newlen);
315 ipsec6stat.in_inval++;
316 else if (error == ENOBUFS)
317 ipsec6stat.in_nomem++;
321 ipsec6stat.in_comphist[cpi]++;
322 m->m_pkthdr.len = off + newlen;
325 * returning decompressed packet onto icmp is meaningless.
326 * mark it decrypted to prevent icmp from attaching original packet.
328 m->m_flags |= M_DECRYPTED;
330 /* update next header field */
331 prvnxtp = ip6_get_prevhdr(m, off);
335 * no need to adjust payload length, as all the IPv6 protocols
336 * look at m->m_pkthdr.len
340 key_sa_recordxfer(sav, m);
341 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
342 ipsec6stat.in_nomem++;
350 ipsec6stat.in_success++;