1/*-
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
| 1/*-
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
|
32
33#include "opt_inet.h"
34#include "opt_inet6.h"
35#include "opt_ipsec.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/kernel.h>
40#include <sys/mac.h>
41#include <sys/malloc.h>
42#include <sys/mbuf.h>
43#include <sys/protosw.h>
44#include <sys/socket.h>
45#include <sys/socketvar.h>
46#include <sys/sysctl.h>
47#include <sys/syslog.h>
48
49#include <net/if.h>
50#include <net/route.h>
51#include <net/vnet.h>
52
53#include <netinet/in.h>
54#include <netinet/in_systm.h>
55#include <netinet/in_var.h>
56#include <netinet/ip.h>
57#include <netinet/ip6.h>
58#include <netinet/in_pcb.h>
59#include <netinet/ip_var.h>
60#include <netinet/ip_options.h>
61
62#include <machine/in_cksum.h>
63
64#ifdef IPSEC
65#include <netipsec/ipsec.h>
66#include <netipsec/ipsec6.h>
67#include <netipsec/xform.h>
68#include <netipsec/key.h>
69#ifdef IPSEC_DEBUG
70#include <netipsec/key_debug.h>
71#else
72#define KEYDEBUG(lev,arg)
73#endif
74#endif /*IPSEC*/
75
76#include <netinet6/ip6_ipsec.h>
77#include <netinet6/ip6_var.h>
78
79extern struct protosw inet6sw[];
80
81
82#ifdef INET6
83#ifdef IPSEC
84#ifdef IPSEC_FILTERTUNNEL
85static VNET_DEFINE(int, ip6_ipsec6_filtertunnel) = 1;
86#else
87static VNET_DEFINE(int, ip6_ipsec6_filtertunnel) = 0;
88#endif
89#define V_ip6_ipsec6_filtertunnel VNET(ip6_ipsec6_filtertunnel)
90
91SYSCTL_DECL(_net_inet6_ipsec6);
92SYSCTL_VNET_INT(_net_inet6_ipsec6, OID_AUTO,
93 filtertunnel, CTLFLAG_RW, &VNET_NAME(ip6_ipsec6_filtertunnel), 0,
94 "If set filter packets from an IPsec tunnel.");
95#endif /* IPSEC */
96#endif /* INET6 */
97
98/*
99 * Check if we have to jump over firewall processing for this packet.
100 * Called from ip6_input().
101 * 1 = jump over firewall, 0 = packet goes through firewall.
102 */
103int
104ip6_ipsec_filtertunnel(struct mbuf *m)
105{
| 32
33#include "opt_inet.h"
34#include "opt_inet6.h"
35#include "opt_ipsec.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/kernel.h>
40#include <sys/mac.h>
41#include <sys/malloc.h>
42#include <sys/mbuf.h>
43#include <sys/protosw.h>
44#include <sys/socket.h>
45#include <sys/socketvar.h>
46#include <sys/sysctl.h>
47#include <sys/syslog.h>
48
49#include <net/if.h>
50#include <net/route.h>
51#include <net/vnet.h>
52
53#include <netinet/in.h>
54#include <netinet/in_systm.h>
55#include <netinet/in_var.h>
56#include <netinet/ip.h>
57#include <netinet/ip6.h>
58#include <netinet/in_pcb.h>
59#include <netinet/ip_var.h>
60#include <netinet/ip_options.h>
61
62#include <machine/in_cksum.h>
63
64#ifdef IPSEC
65#include <netipsec/ipsec.h>
66#include <netipsec/ipsec6.h>
67#include <netipsec/xform.h>
68#include <netipsec/key.h>
69#ifdef IPSEC_DEBUG
70#include <netipsec/key_debug.h>
71#else
72#define KEYDEBUG(lev,arg)
73#endif
74#endif /*IPSEC*/
75
76#include <netinet6/ip6_ipsec.h>
77#include <netinet6/ip6_var.h>
78
79extern struct protosw inet6sw[];
80
81
82#ifdef INET6
83#ifdef IPSEC
84#ifdef IPSEC_FILTERTUNNEL
85static VNET_DEFINE(int, ip6_ipsec6_filtertunnel) = 1;
86#else
87static VNET_DEFINE(int, ip6_ipsec6_filtertunnel) = 0;
88#endif
89#define V_ip6_ipsec6_filtertunnel VNET(ip6_ipsec6_filtertunnel)
90
91SYSCTL_DECL(_net_inet6_ipsec6);
92SYSCTL_VNET_INT(_net_inet6_ipsec6, OID_AUTO,
93 filtertunnel, CTLFLAG_RW, &VNET_NAME(ip6_ipsec6_filtertunnel), 0,
94 "If set filter packets from an IPsec tunnel.");
95#endif /* IPSEC */
96#endif /* INET6 */
97
98/*
99 * Check if we have to jump over firewall processing for this packet.
100 * Called from ip6_input().
101 * 1 = jump over firewall, 0 = packet goes through firewall.
102 */
103int
104ip6_ipsec_filtertunnel(struct mbuf *m)
105{
|
107
108 /*
109 * Bypass packet filtering for packets previously handled by IPsec.
110 */
111 if (!V_ip6_ipsec6_filtertunnel &&
112 m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
113 return 1;
114#endif
115 return 0;
116}
117
118/*
119 * Check if this packet has an active SA and needs to be dropped instead
120 * of forwarded.
121 * Called from ip6_input().
122 * 1 = drop packet, 0 = forward packet.
123 */
124int
125ip6_ipsec_fwd(struct mbuf *m)
126{
127#ifdef IPSEC
128 struct m_tag *mtag;
129 struct tdb_ident *tdbi;
130 struct secpolicy *sp;
131 int s, error;
132 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
133 s = splnet();
134 if (mtag != NULL) {
135 tdbi = (struct tdb_ident *)(mtag + 1);
136 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
137 } else {
138 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
139 IP_FORWARDING, &error);
140 }
141 if (sp == NULL) { /* NB: can happen if error */
142 splx(s);
143 /*XXX error stat???*/
144 DPRINTF(("%s: no SP for forwarding\n", __func__)); /*XXX*/
145 return 1;
146 }
147
148 /*
149 * Check security policy against packet attributes.
150 */
151 error = ipsec_in_reject(sp, m);
152 KEY_FREESP(&sp);
153 splx(s);
154 if (error) {
155 V_ip6stat.ip6s_cantforward++;
156 return 1;
157 }
158#endif /* IPSEC */
159 return 0;
160}
161
162/*
163 * Check if protocol type doesn't have a further header and do IPSEC
164 * decryption or reject right now. Protocols with further headers get
165 * their IPSEC treatment within the protocol specific processing.
166 * Called from ip6_input().
167 * 1 = drop packet, 0 = continue processing packet.
168 */
169int
170ip6_ipsec_input(struct mbuf *m, int nxt)
171{
172#ifdef IPSEC
173 struct m_tag *mtag;
174 struct tdb_ident *tdbi;
175 struct secpolicy *sp;
176 int s, error;
177 /*
178 * enforce IPsec policy checking if we are seeing last header.
179 * note that we do not visit this with protocols with pcb layer
180 * code - like udp/tcp/raw ip.
181 */
182 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
183 ipsec6_in_reject(m, NULL)) {
184
185 /*
186 * Check if the packet has already had IPsec processing
187 * done. If so, then just pass it along. This tag gets
188 * set during AH, ESP, etc. input handling, before the
189 * packet is returned to the ip input queue for delivery.
190 */
191 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
192 s = splnet();
193 if (mtag != NULL) {
194 tdbi = (struct tdb_ident *)(mtag + 1);
195 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
196 } else {
197 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
198 IP_FORWARDING, &error);
199 }
200 if (sp != NULL) {
201 /*
202 * Check security policy against packet attributes.
203 */
204 error = ipsec_in_reject(sp, m);
205 KEY_FREESP(&sp);
206 } else {
207 /* XXX error stat??? */
208 error = EINVAL;
209 DPRINTF(("%s: no SP, packet discarded\n", __func__));/*XXX*/
210 return 1;
211 }
212 splx(s);
213 if (error)
214 return 1;
215 }
216#endif /* IPSEC */
217 return 0;
218}
219
220/*
221 * Called from ip6_output().
222 * 1 = drop packet, 0 = continue processing packet,
223 * -1 = packet was reinjected and stop processing packet
224 */
225
226int
227ip6_ipsec_output(struct mbuf **m, struct inpcb *inp, int *flags, int *error,
228 struct ifnet **ifp, struct secpolicy **sp)
229{
230#ifdef IPSEC
231 struct tdb_ident *tdbi;
232 struct m_tag *mtag;
233 /* XXX int s; */
234 if (sp == NULL)
235 return 1;
236 mtag = m_tag_find(*m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
237 if (mtag != NULL) {
238 tdbi = (struct tdb_ident *)(mtag + 1);
239 *sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND);
240 if (*sp == NULL)
241 *error = -EINVAL; /* force silent drop */
242 m_tag_delete(*m, mtag);
243 } else {
244 *sp = ipsec4_checkpolicy(*m, IPSEC_DIR_OUTBOUND, *flags,
245 error, inp);
246 }
247
248 /*
249 * There are four return cases:
250 * sp != NULL apply IPsec policy
251 * sp == NULL, error == 0 no IPsec handling needed
252 * sp == NULL, error == -EINVAL discard packet w/o error
253 * sp == NULL, error != 0 discard packet, report error
254 */
255 if (*sp != NULL) {
256 /* Loop detection, check if ipsec processing already done */
257 KASSERT((*sp)->req != NULL, ("ip_output: no ipsec request"));
258 for (mtag = m_tag_first(*m); mtag != NULL;
259 mtag = m_tag_next(*m, mtag)) {
260 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT)
261 continue;
262 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
263 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
264 continue;
265 /*
266 * Check if policy has an SA associated with it.
267 * This can happen when an SP has yet to acquire
268 * an SA; e.g. on first reference. If it occurs,
269 * then we let ipsec4_process_packet do its thing.
270 */
271 if ((*sp)->req->sav == NULL)
272 break;
273 tdbi = (struct tdb_ident *)(mtag + 1);
274 if (tdbi->spi == (*sp)->req->sav->spi &&
275 tdbi->proto == (*sp)->req->sav->sah->saidx.proto &&
276 bcmp(&tdbi->dst, &(*sp)->req->sav->sah->saidx.dst,
277 sizeof (union sockaddr_union)) == 0) {
278 /*
279 * No IPsec processing is needed, free
280 * reference to SP.
281 *
282 * NB: null pointer to avoid free at
283 * done: below.
284 */
285 KEY_FREESP(sp), *sp = NULL;
286 /* XXX splx(s); */
287 goto done;
288 }
289 }
290
291 /*
292 * Do delayed checksums now because we send before
293 * this is done in the normal processing path.
294 */
295 if ((*m)->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
296 ipseclog((LOG_DEBUG,
297 "%s: we do not support IPv4 over IPv6", __func__));
298#ifdef INET
299 in_delayed_cksum(*m);
300#endif
301 (*m)->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
302 }
303
304 /*
305 * Preserve KAME behaviour: ENOENT can be returned
306 * when an SA acquire is in progress. Don't propagate
307 * this to user-level; it confuses applications.
308 *
309 * XXX this will go away when the SADB is redone.
310 */
311 if (*error == ENOENT)
312 *error = 0;
313 goto do_ipsec;
314 } else { /* sp == NULL */
315 if (*error != 0) {
316 /*
317 * Hack: -EINVAL is used to signal that a packet
318 * should be silently discarded. This is typically
319 * because we asked key management for an SA and
320 * it was delayed (e.g. kicked up to IKE).
321 */
322 if (*error == -EINVAL)
323 *error = 0;
324 goto bad;
325 } else {
326 /* No IPsec processing for this packet. */
327 }
328 }
329done:
330 return 0;
331do_ipsec:
332 return -1;
333bad:
334 return 1;
335#endif /* IPSEC */
336 return 0;
337}
338
339#if 0
340/*
341 * Compute the MTU for a forwarded packet that gets IPSEC encapsulated.
342 * Called from ip_forward().
343 * Returns MTU suggestion for ICMP needfrag reply.
344 */
345int
346ip6_ipsec_mtu(struct mbuf *m)
347{
348 int mtu = 0;
349 /*
350 * If the packet is routed over IPsec tunnel, tell the
351 * originator the tunnel MTU.
352 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
353 * XXX quickhack!!!
354 */
355#ifdef IPSEC
356 struct secpolicy *sp = NULL;
357 int ipsecerror;
358 int ipsechdr;
359 struct route *ro;
360 sp = ipsec_getpolicybyaddr(m,
361 IPSEC_DIR_OUTBOUND,
362 IP_FORWARDING,
363 &ipsecerror);
364 if (sp != NULL) {
365 /* count IPsec header size */
366 ipsechdr = ipsec_hdrsiz(m, IPSEC_DIR_OUTBOUND, NULL);
367
368 /*
369 * find the correct route for outer IPv4
370 * header, compute tunnel MTU.
371 */
372 if (sp->req != NULL &&
373 sp->req->sav != NULL &&
374 sp->req->sav->sah != NULL) {
375 ro = &sp->req->sav->sah->route_cache.sa_route;
376 if (ro->ro_rt && ro->ro_rt->rt_ifp) {
377 mtu =
378 ro->ro_rt->rt_rmx.rmx_mtu ?
379 ro->ro_rt->rt_rmx.rmx_mtu :
380 ro->ro_rt->rt_ifp->if_mtu;
381 mtu -= ipsechdr;
382 }
383 }
384 KEY_FREESP(&sp);
385 }
386#endif /* IPSEC */
387 /* XXX else case missing. */
388 return mtu;
389}
390#endif
| 107
108 /*
109 * Bypass packet filtering for packets previously handled by IPsec.
110 */
111 if (!V_ip6_ipsec6_filtertunnel &&
112 m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
113 return 1;
114#endif
115 return 0;
116}
117
118/*
119 * Check if this packet has an active SA and needs to be dropped instead
120 * of forwarded.
121 * Called from ip6_input().
122 * 1 = drop packet, 0 = forward packet.
123 */
124int
125ip6_ipsec_fwd(struct mbuf *m)
126{
127#ifdef IPSEC
128 struct m_tag *mtag;
129 struct tdb_ident *tdbi;
130 struct secpolicy *sp;
131 int s, error;
132 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
133 s = splnet();
134 if (mtag != NULL) {
135 tdbi = (struct tdb_ident *)(mtag + 1);
136 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
137 } else {
138 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
139 IP_FORWARDING, &error);
140 }
141 if (sp == NULL) { /* NB: can happen if error */
142 splx(s);
143 /*XXX error stat???*/
144 DPRINTF(("%s: no SP for forwarding\n", __func__)); /*XXX*/
145 return 1;
146 }
147
148 /*
149 * Check security policy against packet attributes.
150 */
151 error = ipsec_in_reject(sp, m);
152 KEY_FREESP(&sp);
153 splx(s);
154 if (error) {
155 V_ip6stat.ip6s_cantforward++;
156 return 1;
157 }
158#endif /* IPSEC */
159 return 0;
160}
161
162/*
163 * Check if protocol type doesn't have a further header and do IPSEC
164 * decryption or reject right now. Protocols with further headers get
165 * their IPSEC treatment within the protocol specific processing.
166 * Called from ip6_input().
167 * 1 = drop packet, 0 = continue processing packet.
168 */
169int
170ip6_ipsec_input(struct mbuf *m, int nxt)
171{
172#ifdef IPSEC
173 struct m_tag *mtag;
174 struct tdb_ident *tdbi;
175 struct secpolicy *sp;
176 int s, error;
177 /*
178 * enforce IPsec policy checking if we are seeing last header.
179 * note that we do not visit this with protocols with pcb layer
180 * code - like udp/tcp/raw ip.
181 */
182 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
183 ipsec6_in_reject(m, NULL)) {
184
185 /*
186 * Check if the packet has already had IPsec processing
187 * done. If so, then just pass it along. This tag gets
188 * set during AH, ESP, etc. input handling, before the
189 * packet is returned to the ip input queue for delivery.
190 */
191 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
192 s = splnet();
193 if (mtag != NULL) {
194 tdbi = (struct tdb_ident *)(mtag + 1);
195 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
196 } else {
197 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
198 IP_FORWARDING, &error);
199 }
200 if (sp != NULL) {
201 /*
202 * Check security policy against packet attributes.
203 */
204 error = ipsec_in_reject(sp, m);
205 KEY_FREESP(&sp);
206 } else {
207 /* XXX error stat??? */
208 error = EINVAL;
209 DPRINTF(("%s: no SP, packet discarded\n", __func__));/*XXX*/
210 return 1;
211 }
212 splx(s);
213 if (error)
214 return 1;
215 }
216#endif /* IPSEC */
217 return 0;
218}
219
220/*
221 * Called from ip6_output().
222 * 1 = drop packet, 0 = continue processing packet,
223 * -1 = packet was reinjected and stop processing packet
224 */
225
226int
227ip6_ipsec_output(struct mbuf **m, struct inpcb *inp, int *flags, int *error,
228 struct ifnet **ifp, struct secpolicy **sp)
229{
230#ifdef IPSEC
231 struct tdb_ident *tdbi;
232 struct m_tag *mtag;
233 /* XXX int s; */
234 if (sp == NULL)
235 return 1;
236 mtag = m_tag_find(*m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
237 if (mtag != NULL) {
238 tdbi = (struct tdb_ident *)(mtag + 1);
239 *sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND);
240 if (*sp == NULL)
241 *error = -EINVAL; /* force silent drop */
242 m_tag_delete(*m, mtag);
243 } else {
244 *sp = ipsec4_checkpolicy(*m, IPSEC_DIR_OUTBOUND, *flags,
245 error, inp);
246 }
247
248 /*
249 * There are four return cases:
250 * sp != NULL apply IPsec policy
251 * sp == NULL, error == 0 no IPsec handling needed
252 * sp == NULL, error == -EINVAL discard packet w/o error
253 * sp == NULL, error != 0 discard packet, report error
254 */
255 if (*sp != NULL) {
256 /* Loop detection, check if ipsec processing already done */
257 KASSERT((*sp)->req != NULL, ("ip_output: no ipsec request"));
258 for (mtag = m_tag_first(*m); mtag != NULL;
259 mtag = m_tag_next(*m, mtag)) {
260 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT)
261 continue;
262 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
263 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
264 continue;
265 /*
266 * Check if policy has an SA associated with it.
267 * This can happen when an SP has yet to acquire
268 * an SA; e.g. on first reference. If it occurs,
269 * then we let ipsec4_process_packet do its thing.
270 */
271 if ((*sp)->req->sav == NULL)
272 break;
273 tdbi = (struct tdb_ident *)(mtag + 1);
274 if (tdbi->spi == (*sp)->req->sav->spi &&
275 tdbi->proto == (*sp)->req->sav->sah->saidx.proto &&
276 bcmp(&tdbi->dst, &(*sp)->req->sav->sah->saidx.dst,
277 sizeof (union sockaddr_union)) == 0) {
278 /*
279 * No IPsec processing is needed, free
280 * reference to SP.
281 *
282 * NB: null pointer to avoid free at
283 * done: below.
284 */
285 KEY_FREESP(sp), *sp = NULL;
286 /* XXX splx(s); */
287 goto done;
288 }
289 }
290
291 /*
292 * Do delayed checksums now because we send before
293 * this is done in the normal processing path.
294 */
295 if ((*m)->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
296 ipseclog((LOG_DEBUG,
297 "%s: we do not support IPv4 over IPv6", __func__));
298#ifdef INET
299 in_delayed_cksum(*m);
300#endif
301 (*m)->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
302 }
303
304 /*
305 * Preserve KAME behaviour: ENOENT can be returned
306 * when an SA acquire is in progress. Don't propagate
307 * this to user-level; it confuses applications.
308 *
309 * XXX this will go away when the SADB is redone.
310 */
311 if (*error == ENOENT)
312 *error = 0;
313 goto do_ipsec;
314 } else { /* sp == NULL */
315 if (*error != 0) {
316 /*
317 * Hack: -EINVAL is used to signal that a packet
318 * should be silently discarded. This is typically
319 * because we asked key management for an SA and
320 * it was delayed (e.g. kicked up to IKE).
321 */
322 if (*error == -EINVAL)
323 *error = 0;
324 goto bad;
325 } else {
326 /* No IPsec processing for this packet. */
327 }
328 }
329done:
330 return 0;
331do_ipsec:
332 return -1;
333bad:
334 return 1;
335#endif /* IPSEC */
336 return 0;
337}
338
339#if 0
340/*
341 * Compute the MTU for a forwarded packet that gets IPSEC encapsulated.
342 * Called from ip_forward().
343 * Returns MTU suggestion for ICMP needfrag reply.
344 */
345int
346ip6_ipsec_mtu(struct mbuf *m)
347{
348 int mtu = 0;
349 /*
350 * If the packet is routed over IPsec tunnel, tell the
351 * originator the tunnel MTU.
352 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
353 * XXX quickhack!!!
354 */
355#ifdef IPSEC
356 struct secpolicy *sp = NULL;
357 int ipsecerror;
358 int ipsechdr;
359 struct route *ro;
360 sp = ipsec_getpolicybyaddr(m,
361 IPSEC_DIR_OUTBOUND,
362 IP_FORWARDING,
363 &ipsecerror);
364 if (sp != NULL) {
365 /* count IPsec header size */
366 ipsechdr = ipsec_hdrsiz(m, IPSEC_DIR_OUTBOUND, NULL);
367
368 /*
369 * find the correct route for outer IPv4
370 * header, compute tunnel MTU.
371 */
372 if (sp->req != NULL &&
373 sp->req->sav != NULL &&
374 sp->req->sav->sah != NULL) {
375 ro = &sp->req->sav->sah->route_cache.sa_route;
376 if (ro->ro_rt && ro->ro_rt->rt_ifp) {
377 mtu =
378 ro->ro_rt->rt_rmx.rmx_mtu ?
379 ro->ro_rt->rt_rmx.rmx_mtu :
380 ro->ro_rt->rt_ifp->if_mtu;
381 mtu -= ipsechdr;
382 }
383 }
384 KEY_FREESP(&sp);
385 }
386#endif /* IPSEC */
387 /* XXX else case missing. */
388 return mtu;
389}
390#endif
|