1 /* $FreeBSD: src/sys/netinet6/ipcomp_input.c,v 1.1.2.3 2002/04/28 05:40:27 suz Exp $ */
2 /* $KAME: ipcomp_input.c,v 1.25 2001/03/01 09:12:09 itojun Exp $ */
5 * Copyright (C) 1999 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * RFC2393 IP payload compression protocol (IPComp).
38 #include "opt_inet6.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
43 #include <sys/domain.h>
44 #include <sys/protosw.h>
45 #include <sys/socket.h>
46 #include <sys/errno.h>
48 #include <sys/syslog.h>
51 #include <net/route.h>
52 #include <net/netisr.h>
53 #include <machine/cpu.h>
55 #include <netinet/in.h>
56 #include <netinet/in_systm.h>
57 #include <netinet/in_var.h>
58 #include <netinet/ip.h>
59 #include <netinet/ip_var.h>
60 #include <netinet/ip_ecn.h>
63 #include <netinet/ip6.h>
64 #include <netinet6/ip6_var.h>
66 #include <netinet6/ipcomp.h>
68 #include <netinet6/ipcomp6.h>
71 #include <netinet6/ipsec.h>
73 #include <netinet6/ipsec6.h>
75 #include <netproto/key/key.h>
76 #include <netproto/key/keydb.h>
78 #include <machine/stdarg.h>
80 #include <net/net_osdep.h>
85 extern struct protosw inetsw[];
88 ipcomp4_input(struct mbuf **mp, int *offp, int proto)
94 struct ipcomp *ipcomp;
95 const struct ipcomp_algorithm *algo;
96 u_int16_t cpi; /* host order */
100 struct secasvar *sav = NULL;
106 if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
107 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
108 "(packet too short)\n"));
109 ipsecstat.in_inval++;
113 md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
115 m = NULL; /* already freed */
116 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
117 "(pulldown failure)\n"));
118 ipsecstat.in_inval++;
121 ipcomp = mtod(md, struct ipcomp *);
122 ip = mtod(m, struct ip *);
123 nxt = ipcomp->comp_nxt;
125 cpi = ntohs(ipcomp->comp_cpi);
127 if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
128 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
129 (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
131 && (sav->state == SADB_SASTATE_MATURE
132 || sav->state == SADB_SASTATE_DYING)) {
133 cpi = sav->alg_enc; /* XXX */
134 /* other parameters to look at? */
137 algo = ipcomp_algorithm_lookup(cpi);
139 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
145 /* chop ipcomp header */
147 md->m_data += sizeof(struct ipcomp);
148 md->m_len -= sizeof(struct ipcomp);
149 m->m_pkthdr.len -= sizeof(struct ipcomp);
151 ip->ip_len -= sizeof(struct ipcomp);
153 ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
156 olen = m->m_pkthdr.len;
157 newlen = m->m_pkthdr.len - off;
158 error = (*algo->decompress)(m, m->m_next, &newlen);
161 ipsecstat.in_inval++;
162 else if (error == ENOBUFS)
163 ipsecstat.in_nomem++;
167 ipsecstat.in_comphist[cpi]++;
170 * returning decompressed packet onto icmp is meaningless.
171 * mark it decrypted to prevent icmp from attaching original packet.
173 m->m_flags |= M_DECRYPTED;
175 m->m_pkthdr.len = off + newlen;
176 ip = mtod(m, struct ip *);
182 len = ntohs(ip->ip_len);
185 * be careful about underflow. also, do not assign exact value
186 * as ip_len is manipulated differently on *BSDs.
188 len += m->m_pkthdr.len;
191 /* packet too big after decompress */
192 ipsecstat.in_inval++;
196 ip->ip_len = len & 0xffff;
198 ip->ip_len = htons(len & 0xffff);
204 key_sa_recordxfer(sav, m);
205 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
206 ipsecstat.in_nomem++;
213 if (nxt != IPPROTO_DONE) {
214 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) &&
215 ipsec4_in_reject(m, NULL)) {
216 ipsecstat.in_polvio++;
221 (*inetsw[ip_protox[nxt]].pr_input)(mp, offp, nxt);
227 ipsecstat.in_success++;
228 return(IPPROTO_DONE);
235 return(IPPROTO_DONE);
241 ipcomp6_input(struct mbuf **mp, int *offp, int proto)
246 struct ipcomp *ipcomp;
247 const struct ipcomp_algorithm *algo;
248 u_int16_t cpi; /* host order */
252 struct secasvar *sav = NULL;
258 md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
260 m = NULL; /* already freed */
261 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
262 "(pulldown failure)\n"));
263 ipsec6stat.in_inval++;
266 ipcomp = mtod(md, struct ipcomp *);
267 ip6 = mtod(m, struct ip6_hdr *);
268 nxt = ipcomp->comp_nxt;
270 cpi = ntohs(ipcomp->comp_cpi);
272 if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
273 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
274 (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
276 && (sav->state == SADB_SASTATE_MATURE
277 || sav->state == SADB_SASTATE_DYING)) {
278 cpi = sav->alg_enc; /* XXX */
279 /* other parameters to look at? */
282 algo = ipcomp_algorithm_lookup(cpi);
284 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
285 "dropping the packet for simplicity\n", cpi));
286 ipsec6stat.in_nosa++;
290 /* chop ipcomp header */
292 md->m_data += sizeof(struct ipcomp);
293 md->m_len -= sizeof(struct ipcomp);
294 m->m_pkthdr.len -= sizeof(struct ipcomp);
296 newlen = m->m_pkthdr.len - off;
297 error = (*algo->decompress)(m, md, &newlen);
300 ipsec6stat.in_inval++;
301 else if (error == ENOBUFS)
302 ipsec6stat.in_nomem++;
306 ipsec6stat.in_comphist[cpi]++;
307 m->m_pkthdr.len = off + newlen;
310 * returning decompressed packet onto icmp is meaningless.
311 * mark it decrypted to prevent icmp from attaching original packet.
313 m->m_flags |= M_DECRYPTED;
315 /* update next header field */
316 prvnxtp = ip6_get_prevhdr(m, off);
320 * no need to adjust payload length, as all the IPv6 protocols
321 * look at m->m_pkthdr.len
325 key_sa_recordxfer(sav, m);
326 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
327 ipsec6stat.in_nomem++;
335 ipsec6stat.in_success++;