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>
54 #include <machine/cpu.h>
56 #include <netinet/in.h>
57 #include <netinet/in_systm.h>
58 #include <netinet/in_var.h>
59 #include <netinet/ip.h>
60 #include <netinet/ip_var.h>
61 #include <netinet/ip_ecn.h>
64 #include <netinet/ip6.h>
65 #include <netinet6/ip6_var.h>
67 #include <netinet6/ipcomp.h>
69 #include <netinet6/ipcomp6.h>
72 #include <netinet6/ipsec.h>
74 #include <netinet6/ipsec6.h>
76 #include <netkey/key.h>
77 #include <netkey/keydb.h>
79 #include <machine/stdarg.h>
81 #include <net/net_osdep.h>
86 #include <netinet/ipprotosw.h>
87 extern struct ipprotosw inetsw[];
91 ipcomp4_input(struct mbuf *m, ...)
93 ipcomp4_input(m, va_alist)
100 struct ipcomp *ipcomp;
101 const struct ipcomp_algorithm *algo;
102 u_int16_t cpi; /* host order */
107 struct secasvar *sav = NULL;
112 off = va_arg(ap, int);
113 proto = va_arg(ap, int);
116 if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
117 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
118 "(packet too short)\n"));
119 ipsecstat.in_inval++;
123 md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
125 m = NULL; /* already freed */
126 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
127 "(pulldown failure)\n"));
128 ipsecstat.in_inval++;
131 ipcomp = mtod(md, struct ipcomp *);
132 ip = mtod(m, struct ip *);
133 nxt = ipcomp->comp_nxt;
135 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
137 hlen = ip->ip_hl << 2;
140 cpi = ntohs(ipcomp->comp_cpi);
142 if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
143 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
144 (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
146 && (sav->state == SADB_SASTATE_MATURE
147 || sav->state == SADB_SASTATE_DYING)) {
148 cpi = sav->alg_enc; /* XXX */
149 /* other parameters to look at? */
152 algo = ipcomp_algorithm_lookup(cpi);
154 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
160 /* chop ipcomp header */
162 md->m_data += sizeof(struct ipcomp);
163 md->m_len -= sizeof(struct ipcomp);
164 m->m_pkthdr.len -= sizeof(struct ipcomp);
166 ip->ip_len -= sizeof(struct ipcomp);
168 ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
171 olen = m->m_pkthdr.len;
172 newlen = m->m_pkthdr.len - off;
173 error = (*algo->decompress)(m, m->m_next, &newlen);
176 ipsecstat.in_inval++;
177 else if (error == ENOBUFS)
178 ipsecstat.in_nomem++;
182 ipsecstat.in_comphist[cpi]++;
185 * returning decompressed packet onto icmp is meaningless.
186 * mark it decrypted to prevent icmp from attaching original packet.
188 m->m_flags |= M_DECRYPTED;
190 m->m_pkthdr.len = off + newlen;
191 ip = mtod(m, struct ip *);
197 len = ntohs(ip->ip_len);
200 * be careful about underflow. also, do not assign exact value
201 * as ip_len is manipulated differently on *BSDs.
203 len += m->m_pkthdr.len;
206 /* packet too big after decompress */
207 ipsecstat.in_inval++;
211 ip->ip_len = len & 0xffff;
213 ip->ip_len = htons(len & 0xffff);
219 key_sa_recordxfer(sav, m);
220 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
221 ipsecstat.in_nomem++;
228 if (nxt != IPPROTO_DONE) {
229 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
230 ipsec4_in_reject(m, NULL)) {
231 ipsecstat.in_polvio++;
234 (*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
239 ipsecstat.in_success++;
253 ipcomp6_input(mp, offp, proto)
260 struct ipcomp *ipcomp;
261 const struct ipcomp_algorithm *algo;
262 u_int16_t cpi; /* host order */
266 struct secasvar *sav = NULL;
272 md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
274 m = NULL; /* already freed */
275 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
276 "(pulldown failure)\n"));
277 ipsec6stat.in_inval++;
280 ipcomp = mtod(md, struct ipcomp *);
281 ip6 = mtod(m, struct ip6_hdr *);
282 nxt = ipcomp->comp_nxt;
284 cpi = ntohs(ipcomp->comp_cpi);
286 if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
287 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
288 (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
290 && (sav->state == SADB_SASTATE_MATURE
291 || sav->state == SADB_SASTATE_DYING)) {
292 cpi = sav->alg_enc; /* XXX */
293 /* other parameters to look at? */
296 algo = ipcomp_algorithm_lookup(cpi);
298 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
299 "dropping the packet for simplicity\n", cpi));
300 ipsec6stat.in_nosa++;
304 /* chop ipcomp header */
306 md->m_data += sizeof(struct ipcomp);
307 md->m_len -= sizeof(struct ipcomp);
308 m->m_pkthdr.len -= sizeof(struct ipcomp);
310 newlen = m->m_pkthdr.len - off;
311 error = (*algo->decompress)(m, md, &newlen);
314 ipsec6stat.in_inval++;
315 else if (error == ENOBUFS)
316 ipsec6stat.in_nomem++;
320 ipsec6stat.in_comphist[cpi]++;
321 m->m_pkthdr.len = off + newlen;
324 * returning decompressed packet onto icmp is meaningless.
325 * mark it decrypted to prevent icmp from attaching original packet.
327 m->m_flags |= M_DECRYPTED;
329 /* update next header field */
330 prvnxtp = ip6_get_prevhdr(m, off);
334 * no need to adjust payload length, as all the IPv6 protocols
335 * look at m->m_pkthdr.len
339 key_sa_recordxfer(sav, m);
340 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
341 ipsec6stat.in_nomem++;
349 ipsec6stat.in_success++;