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 1.9 2007/11/22 20:19:43 hasso 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 extern struct protosw inetsw[];
90 ipcomp4_input(struct mbuf **mp, int *offp, int proto)
96 struct ipcomp *ipcomp;
97 const struct ipcomp_algorithm *algo;
98 u_int16_t cpi; /* host order */
103 struct secasvar *sav = NULL;
109 if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
110 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
111 "(packet too short)\n"));
112 ipsecstat.in_inval++;
116 md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
118 m = NULL; /* already freed */
119 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
120 "(pulldown failure)\n"));
121 ipsecstat.in_inval++;
124 ipcomp = mtod(md, struct ipcomp *);
125 ip = mtod(m, struct ip *);
126 nxt = ipcomp->comp_nxt;
128 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
130 hlen = ip->ip_hl << 2;
133 cpi = ntohs(ipcomp->comp_cpi);
135 if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
136 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
137 (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
139 && (sav->state == SADB_SASTATE_MATURE
140 || sav->state == SADB_SASTATE_DYING)) {
141 cpi = sav->alg_enc; /* XXX */
142 /* other parameters to look at? */
145 algo = ipcomp_algorithm_lookup(cpi);
147 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
153 /* chop ipcomp header */
155 md->m_data += sizeof(struct ipcomp);
156 md->m_len -= sizeof(struct ipcomp);
157 m->m_pkthdr.len -= sizeof(struct ipcomp);
159 ip->ip_len -= sizeof(struct ipcomp);
161 ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
164 olen = m->m_pkthdr.len;
165 newlen = m->m_pkthdr.len - off;
166 error = (*algo->decompress)(m, m->m_next, &newlen);
169 ipsecstat.in_inval++;
170 else if (error == ENOBUFS)
171 ipsecstat.in_nomem++;
175 ipsecstat.in_comphist[cpi]++;
178 * returning decompressed packet onto icmp is meaningless.
179 * mark it decrypted to prevent icmp from attaching original packet.
181 m->m_flags |= M_DECRYPTED;
183 m->m_pkthdr.len = off + newlen;
184 ip = mtod(m, struct ip *);
190 len = ntohs(ip->ip_len);
193 * be careful about underflow. also, do not assign exact value
194 * as ip_len is manipulated differently on *BSDs.
196 len += m->m_pkthdr.len;
199 /* packet too big after decompress */
200 ipsecstat.in_inval++;
204 ip->ip_len = len & 0xffff;
206 ip->ip_len = htons(len & 0xffff);
212 key_sa_recordxfer(sav, m);
213 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
214 ipsecstat.in_nomem++;
221 if (nxt != IPPROTO_DONE) {
222 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) &&
223 ipsec4_in_reject(m, NULL)) {
224 ipsecstat.in_polvio++;
229 (*inetsw[ip_protox[nxt]].pr_input)(mp, offp, nxt);
235 ipsecstat.in_success++;
236 return(IPPROTO_DONE);
243 return(IPPROTO_DONE);
249 ipcomp6_input(struct mbuf **mp, int *offp, int proto)
254 struct ipcomp *ipcomp;
255 const struct ipcomp_algorithm *algo;
256 u_int16_t cpi; /* host order */
260 struct secasvar *sav = NULL;
266 md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
268 m = NULL; /* already freed */
269 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
270 "(pulldown failure)\n"));
271 ipsec6stat.in_inval++;
274 ipcomp = mtod(md, struct ipcomp *);
275 ip6 = mtod(m, struct ip6_hdr *);
276 nxt = ipcomp->comp_nxt;
278 cpi = ntohs(ipcomp->comp_cpi);
280 if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
281 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
282 (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
284 && (sav->state == SADB_SASTATE_MATURE
285 || sav->state == SADB_SASTATE_DYING)) {
286 cpi = sav->alg_enc; /* XXX */
287 /* other parameters to look at? */
290 algo = ipcomp_algorithm_lookup(cpi);
292 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
293 "dropping the packet for simplicity\n", cpi));
294 ipsec6stat.in_nosa++;
298 /* chop ipcomp header */
300 md->m_data += sizeof(struct ipcomp);
301 md->m_len -= sizeof(struct ipcomp);
302 m->m_pkthdr.len -= sizeof(struct ipcomp);
304 newlen = m->m_pkthdr.len - off;
305 error = (*algo->decompress)(m, md, &newlen);
308 ipsec6stat.in_inval++;
309 else if (error == ENOBUFS)
310 ipsec6stat.in_nomem++;
314 ipsec6stat.in_comphist[cpi]++;
315 m->m_pkthdr.len = off + newlen;
318 * returning decompressed packet onto icmp is meaningless.
319 * mark it decrypted to prevent icmp from attaching original packet.
321 m->m_flags |= M_DECRYPTED;
323 /* update next header field */
324 prvnxtp = ip6_get_prevhdr(m, off);
328 * no need to adjust payload length, as all the IPv6 protocols
329 * look at m->m_pkthdr.len
333 key_sa_recordxfer(sav, m);
334 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
335 ipsec6stat.in_nomem++;
343 ipsec6stat.in_success++;