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>
|
58
59#include <machine/in_cksum.h>
60
61#ifdef IPSEC
62#include <netipsec/ipsec.h>
63#include <netipsec/xform.h>
64#include <netipsec/key.h>
65#endif /*IPSEC*/
66
67extern struct protosw inetsw[];
68
69/*
70 * Check if we have to jump over firewall processing for this packet.
71 * Called from ip_input().
72 * 1 = jump over firewall, 0 = packet goes through firewall.
73 */
74int
75ip_ipsec_filtertunnel(struct mbuf *m)
76{
77#if defined(IPSEC) && !defined(IPSEC_FILTERTUNNEL)
78 /*
79 * Bypass packet filtering for packets from a tunnel.
80 */
81 if (m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
82 return 1;
83#endif
84 return 0;
85}
86
87/*
88 * Check if this packet has an active SA and needs to be dropped instead
89 * of forwarded.
90 * Called from ip_input().
91 * 1 = drop packet, 0 = forward packet.
92 */
93int
94ip_ipsec_fwd(struct mbuf *m)
95{
96#ifdef IPSEC
97 INIT_VNET_INET(curvnet);
98 INIT_VNET_IPSEC(curvnet);
99 struct m_tag *mtag;
100 struct tdb_ident *tdbi;
101 struct secpolicy *sp;
102 int s, error;
103
104 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
105 s = splnet();
106 if (mtag != NULL) {
107 tdbi = (struct tdb_ident *)(mtag + 1);
108 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
109 } else {
110 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
111 IP_FORWARDING, &error);
112 }
113 if (sp == NULL) { /* NB: can happen if error */
114 splx(s);
115 /*XXX error stat???*/
116 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
117 return 1;
118 }
119
120 /*
121 * Check security policy against packet attributes.
122 */
123 error = ipsec_in_reject(sp, m);
124 KEY_FREESP(&sp);
125 splx(s);
126 if (error) {
127 V_ipstat.ips_cantforward++;
128 return 1;
129 }
130#endif /* IPSEC */
131 return 0;
132}
133
134/*
135 * Check if protocol type doesn't have a further header and do IPSEC
136 * decryption or reject right now. Protocols with further headers get
137 * their IPSEC treatment within the protocol specific processing.
138 * Called from ip_input().
139 * 1 = drop packet, 0 = continue processing packet.
140 */
141int
142ip_ipsec_input(struct mbuf *m)
143{
144 struct ip *ip = mtod(m, struct ip *);
145#ifdef IPSEC
146 INIT_VNET_IPSEC(curvnet);
147 struct m_tag *mtag;
148 struct tdb_ident *tdbi;
149 struct secpolicy *sp;
150 int s, error;
151 /*
152 * enforce IPsec policy checking if we are seeing last header.
153 * note that we do not visit this with protocols with pcb layer
154 * code - like udp/tcp/raw ip.
155 */
156 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
157 /*
158 * Check if the packet has already had IPsec processing
159 * done. If so, then just pass it along. This tag gets
160 * set during AH, ESP, etc. input handling, before the
161 * packet is returned to the ip input queue for delivery.
162 */
163 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
164 s = splnet();
165 if (mtag != NULL) {
166 tdbi = (struct tdb_ident *)(mtag + 1);
167 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
168 } else {
169 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
170 IP_FORWARDING, &error);
171 }
172 if (sp != NULL) {
173 /*
174 * Check security policy against packet attributes.
175 */
176 error = ipsec_in_reject(sp, m);
177 KEY_FREESP(&sp);
178 } else {
179 /* XXX error stat??? */
180 error = EINVAL;
181 DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
182 return 1;
183 }
184 splx(s);
185 if (error)
186 return 1;
187 }
188#endif /* IPSEC */
189 return 0;
190}
191
192/*
193 * Compute the MTU for a forwarded packet that gets IPSEC encapsulated.
194 * Called from ip_forward().
195 * Returns MTU suggestion for ICMP needfrag reply.
196 */
197int
198ip_ipsec_mtu(struct mbuf *m, int mtu)
199{
200 /*
201 * If the packet is routed over IPsec tunnel, tell the
202 * originator the tunnel MTU.
203 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
204 * XXX quickhack!!!
205 */
206 struct secpolicy *sp = NULL;
207 int ipsecerror;
208 int ipsechdr;
209 struct route *ro;
210 sp = ipsec_getpolicybyaddr(m,
211 IPSEC_DIR_OUTBOUND,
212 IP_FORWARDING,
213 &ipsecerror);
214 if (sp != NULL) {
215 /* count IPsec header size */
216 ipsechdr = ipsec4_hdrsiz(m,
217 IPSEC_DIR_OUTBOUND,
218 NULL);
219
220 /*
221 * find the correct route for outer IPv4
222 * header, compute tunnel MTU.
223 */
224 if (sp->req != NULL &&
225 sp->req->sav != NULL &&
226 sp->req->sav->sah != NULL) {
227 ro = &sp->req->sav->sah->sa_route;
228 if (ro->ro_rt && ro->ro_rt->rt_ifp) {
229 mtu =
230 ro->ro_rt->rt_rmx.rmx_mtu ?
231 ro->ro_rt->rt_rmx.rmx_mtu :
232 ro->ro_rt->rt_ifp->if_mtu;
233 mtu -= ipsechdr;
234 }
235 }
236 KEY_FREESP(&sp);
237 }
238 return mtu;
239}
240
241/*
242 *
243 * Called from ip_output().
244 * 1 = drop packet, 0 = continue processing packet,
245 * -1 = packet was reinjected and stop processing packet
246 */
247int
248ip_ipsec_output(struct mbuf **m, struct inpcb *inp, int *flags, int *error,
249 struct route **ro, struct route *iproute, struct sockaddr_in **dst,
250 struct in_ifaddr **ia, struct ifnet **ifp)
251{
252#ifdef IPSEC
253 struct secpolicy *sp = NULL;
254 struct ip *ip = mtod(*m, struct ip *);
255 struct tdb_ident *tdbi;
256 struct m_tag *mtag;
257 int s;
258 /*
259 * Check the security policy (SP) for the packet and, if
260 * required, do IPsec-related processing. There are two
261 * cases here; the first time a packet is sent through
262 * it will be untagged and handled by ipsec4_checkpolicy.
263 * If the packet is resubmitted to ip_output (e.g. after
264 * AH, ESP, etc. processing), there will be a tag to bypass
265 * the lookup and related policy checking.
266 */
267 mtag = m_tag_find(*m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
268 s = splnet();
269 if (mtag != NULL) {
270 tdbi = (struct tdb_ident *)(mtag + 1);
271 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND);
272 if (sp == NULL)
273 *error = -EINVAL; /* force silent drop */
274 m_tag_delete(*m, mtag);
275 } else {
276 sp = ipsec4_checkpolicy(*m, IPSEC_DIR_OUTBOUND, *flags,
277 error, inp);
278 }
279 /*
280 * There are four return cases:
281 * sp != NULL apply IPsec policy
282 * sp == NULL, error == 0 no IPsec handling needed
283 * sp == NULL, error == -EINVAL discard packet w/o error
284 * sp == NULL, error != 0 discard packet, report error
285 */
286 if (sp != NULL) {
287 /* Loop detection, check if ipsec processing already done */
288 KASSERT(sp->req != NULL, ("ip_output: no ipsec request"));
289 for (mtag = m_tag_first(*m); mtag != NULL;
290 mtag = m_tag_next(*m, mtag)) {
291 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT)
292 continue;
293 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
294 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
295 continue;
296 /*
297 * Check if policy has an SA associated with it.
298 * This can happen when an SP has yet to acquire
299 * an SA; e.g. on first reference. If it occurs,
300 * then we let ipsec4_process_packet do its thing.
301 */
302 if (sp->req->sav == NULL)
303 break;
304 tdbi = (struct tdb_ident *)(mtag + 1);
305 if (tdbi->spi == sp->req->sav->spi &&
306 tdbi->proto == sp->req->sav->sah->saidx.proto &&
307 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst,
308 sizeof (union sockaddr_union)) == 0) {
309 /*
310 * No IPsec processing is needed, free
311 * reference to SP.
312 *
313 * NB: null pointer to avoid free at
314 * done: below.
315 */
316 KEY_FREESP(&sp), sp = NULL;
317 splx(s);
318 goto done;
319 }
320 }
321
322 /*
323 * Do delayed checksums now because we send before
324 * this is done in the normal processing path.
325 */
326 if ((*m)->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
327 in_delayed_cksum(*m);
328 (*m)->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
329 }
330
331 ip->ip_len = htons(ip->ip_len);
332 ip->ip_off = htons(ip->ip_off);
333
334 /* NB: callee frees mbuf */
335 *error = ipsec4_process_packet(*m, sp->req, *flags, 0);
336 if (*error == EJUSTRETURN) {
337 /*
338 * We had a SP with a level of 'use' and no SA. We
339 * will just continue to process the packet without
340 * IPsec processing and return without error.
341 */
342 *error = 0;
343 ip->ip_len = ntohs(ip->ip_len);
344 ip->ip_off = ntohs(ip->ip_off);
345 goto done;
346 }
347 /*
348 * Preserve KAME behaviour: ENOENT can be returned
349 * when an SA acquire is in progress. Don't propagate
350 * this to user-level; it confuses applications.
351 *
352 * XXX this will go away when the SADB is redone.
353 */
354 if (*error == ENOENT)
355 *error = 0;
356 splx(s);
357 goto reinjected;
358 } else { /* sp == NULL */
359 splx(s);
360
361 if (*error != 0) {
362 /*
363 * Hack: -EINVAL is used to signal that a packet
364 * should be silently discarded. This is typically
365 * because we asked key management for an SA and
366 * it was delayed (e.g. kicked up to IKE).
367 */
368 if (*error == -EINVAL)
369 *error = 0;
370 goto bad;
371 } else {
372 /* No IPsec processing for this packet. */
373 }
374#ifdef notyet
375 /*
376 * If deferred crypto processing is needed, check that
377 * the interface supports it.
378 */
379 mtag = m_tag_find(*m, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL);
380 if (mtag != NULL && ((*ifp)->if_capenable & IFCAP_IPSEC) == 0) {
381 /* notify IPsec to do its own crypto */
382 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1));
383 *error = EHOSTUNREACH;
384 goto bad;
385 }
386#endif
387 }
388done:
389 if (sp != NULL)
390 KEY_FREESP(&sp);
391 return 0;
392reinjected:
393 if (sp != NULL)
394 KEY_FREESP(&sp);
395 return -1;
396bad:
397 if (sp != NULL)
398 KEY_FREESP(&sp);
399 return 1;
400#endif /* IPSEC */
401 return 0;
402}
| 59
60#include <machine/in_cksum.h>
61
62#ifdef IPSEC
63#include <netipsec/ipsec.h>
64#include <netipsec/xform.h>
65#include <netipsec/key.h>
66#endif /*IPSEC*/
67
68extern struct protosw inetsw[];
69
70/*
71 * Check if we have to jump over firewall processing for this packet.
72 * Called from ip_input().
73 * 1 = jump over firewall, 0 = packet goes through firewall.
74 */
75int
76ip_ipsec_filtertunnel(struct mbuf *m)
77{
78#if defined(IPSEC) && !defined(IPSEC_FILTERTUNNEL)
79 /*
80 * Bypass packet filtering for packets from a tunnel.
81 */
82 if (m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
83 return 1;
84#endif
85 return 0;
86}
87
88/*
89 * Check if this packet has an active SA and needs to be dropped instead
90 * of forwarded.
91 * Called from ip_input().
92 * 1 = drop packet, 0 = forward packet.
93 */
94int
95ip_ipsec_fwd(struct mbuf *m)
96{
97#ifdef IPSEC
98 INIT_VNET_INET(curvnet);
99 INIT_VNET_IPSEC(curvnet);
100 struct m_tag *mtag;
101 struct tdb_ident *tdbi;
102 struct secpolicy *sp;
103 int s, error;
104
105 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
106 s = splnet();
107 if (mtag != NULL) {
108 tdbi = (struct tdb_ident *)(mtag + 1);
109 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
110 } else {
111 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
112 IP_FORWARDING, &error);
113 }
114 if (sp == NULL) { /* NB: can happen if error */
115 splx(s);
116 /*XXX error stat???*/
117 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
118 return 1;
119 }
120
121 /*
122 * Check security policy against packet attributes.
123 */
124 error = ipsec_in_reject(sp, m);
125 KEY_FREESP(&sp);
126 splx(s);
127 if (error) {
128 V_ipstat.ips_cantforward++;
129 return 1;
130 }
131#endif /* IPSEC */
132 return 0;
133}
134
135/*
136 * Check if protocol type doesn't have a further header and do IPSEC
137 * decryption or reject right now. Protocols with further headers get
138 * their IPSEC treatment within the protocol specific processing.
139 * Called from ip_input().
140 * 1 = drop packet, 0 = continue processing packet.
141 */
142int
143ip_ipsec_input(struct mbuf *m)
144{
145 struct ip *ip = mtod(m, struct ip *);
146#ifdef IPSEC
147 INIT_VNET_IPSEC(curvnet);
148 struct m_tag *mtag;
149 struct tdb_ident *tdbi;
150 struct secpolicy *sp;
151 int s, error;
152 /*
153 * enforce IPsec policy checking if we are seeing last header.
154 * note that we do not visit this with protocols with pcb layer
155 * code - like udp/tcp/raw ip.
156 */
157 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
158 /*
159 * Check if the packet has already had IPsec processing
160 * done. If so, then just pass it along. This tag gets
161 * set during AH, ESP, etc. input handling, before the
162 * packet is returned to the ip input queue for delivery.
163 */
164 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
165 s = splnet();
166 if (mtag != NULL) {
167 tdbi = (struct tdb_ident *)(mtag + 1);
168 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
169 } else {
170 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
171 IP_FORWARDING, &error);
172 }
173 if (sp != NULL) {
174 /*
175 * Check security policy against packet attributes.
176 */
177 error = ipsec_in_reject(sp, m);
178 KEY_FREESP(&sp);
179 } else {
180 /* XXX error stat??? */
181 error = EINVAL;
182 DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
183 return 1;
184 }
185 splx(s);
186 if (error)
187 return 1;
188 }
189#endif /* IPSEC */
190 return 0;
191}
192
193/*
194 * Compute the MTU for a forwarded packet that gets IPSEC encapsulated.
195 * Called from ip_forward().
196 * Returns MTU suggestion for ICMP needfrag reply.
197 */
198int
199ip_ipsec_mtu(struct mbuf *m, int mtu)
200{
201 /*
202 * If the packet is routed over IPsec tunnel, tell the
203 * originator the tunnel MTU.
204 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
205 * XXX quickhack!!!
206 */
207 struct secpolicy *sp = NULL;
208 int ipsecerror;
209 int ipsechdr;
210 struct route *ro;
211 sp = ipsec_getpolicybyaddr(m,
212 IPSEC_DIR_OUTBOUND,
213 IP_FORWARDING,
214 &ipsecerror);
215 if (sp != NULL) {
216 /* count IPsec header size */
217 ipsechdr = ipsec4_hdrsiz(m,
218 IPSEC_DIR_OUTBOUND,
219 NULL);
220
221 /*
222 * find the correct route for outer IPv4
223 * header, compute tunnel MTU.
224 */
225 if (sp->req != NULL &&
226 sp->req->sav != NULL &&
227 sp->req->sav->sah != NULL) {
228 ro = &sp->req->sav->sah->sa_route;
229 if (ro->ro_rt && ro->ro_rt->rt_ifp) {
230 mtu =
231 ro->ro_rt->rt_rmx.rmx_mtu ?
232 ro->ro_rt->rt_rmx.rmx_mtu :
233 ro->ro_rt->rt_ifp->if_mtu;
234 mtu -= ipsechdr;
235 }
236 }
237 KEY_FREESP(&sp);
238 }
239 return mtu;
240}
241
242/*
243 *
244 * Called from ip_output().
245 * 1 = drop packet, 0 = continue processing packet,
246 * -1 = packet was reinjected and stop processing packet
247 */
248int
249ip_ipsec_output(struct mbuf **m, struct inpcb *inp, int *flags, int *error,
250 struct route **ro, struct route *iproute, struct sockaddr_in **dst,
251 struct in_ifaddr **ia, struct ifnet **ifp)
252{
253#ifdef IPSEC
254 struct secpolicy *sp = NULL;
255 struct ip *ip = mtod(*m, struct ip *);
256 struct tdb_ident *tdbi;
257 struct m_tag *mtag;
258 int s;
259 /*
260 * Check the security policy (SP) for the packet and, if
261 * required, do IPsec-related processing. There are two
262 * cases here; the first time a packet is sent through
263 * it will be untagged and handled by ipsec4_checkpolicy.
264 * If the packet is resubmitted to ip_output (e.g. after
265 * AH, ESP, etc. processing), there will be a tag to bypass
266 * the lookup and related policy checking.
267 */
268 mtag = m_tag_find(*m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
269 s = splnet();
270 if (mtag != NULL) {
271 tdbi = (struct tdb_ident *)(mtag + 1);
272 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND);
273 if (sp == NULL)
274 *error = -EINVAL; /* force silent drop */
275 m_tag_delete(*m, mtag);
276 } else {
277 sp = ipsec4_checkpolicy(*m, IPSEC_DIR_OUTBOUND, *flags,
278 error, inp);
279 }
280 /*
281 * There are four return cases:
282 * sp != NULL apply IPsec policy
283 * sp == NULL, error == 0 no IPsec handling needed
284 * sp == NULL, error == -EINVAL discard packet w/o error
285 * sp == NULL, error != 0 discard packet, report error
286 */
287 if (sp != NULL) {
288 /* Loop detection, check if ipsec processing already done */
289 KASSERT(sp->req != NULL, ("ip_output: no ipsec request"));
290 for (mtag = m_tag_first(*m); mtag != NULL;
291 mtag = m_tag_next(*m, mtag)) {
292 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT)
293 continue;
294 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
295 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
296 continue;
297 /*
298 * Check if policy has an SA associated with it.
299 * This can happen when an SP has yet to acquire
300 * an SA; e.g. on first reference. If it occurs,
301 * then we let ipsec4_process_packet do its thing.
302 */
303 if (sp->req->sav == NULL)
304 break;
305 tdbi = (struct tdb_ident *)(mtag + 1);
306 if (tdbi->spi == sp->req->sav->spi &&
307 tdbi->proto == sp->req->sav->sah->saidx.proto &&
308 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst,
309 sizeof (union sockaddr_union)) == 0) {
310 /*
311 * No IPsec processing is needed, free
312 * reference to SP.
313 *
314 * NB: null pointer to avoid free at
315 * done: below.
316 */
317 KEY_FREESP(&sp), sp = NULL;
318 splx(s);
319 goto done;
320 }
321 }
322
323 /*
324 * Do delayed checksums now because we send before
325 * this is done in the normal processing path.
326 */
327 if ((*m)->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
328 in_delayed_cksum(*m);
329 (*m)->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
330 }
331
332 ip->ip_len = htons(ip->ip_len);
333 ip->ip_off = htons(ip->ip_off);
334
335 /* NB: callee frees mbuf */
336 *error = ipsec4_process_packet(*m, sp->req, *flags, 0);
337 if (*error == EJUSTRETURN) {
338 /*
339 * We had a SP with a level of 'use' and no SA. We
340 * will just continue to process the packet without
341 * IPsec processing and return without error.
342 */
343 *error = 0;
344 ip->ip_len = ntohs(ip->ip_len);
345 ip->ip_off = ntohs(ip->ip_off);
346 goto done;
347 }
348 /*
349 * Preserve KAME behaviour: ENOENT can be returned
350 * when an SA acquire is in progress. Don't propagate
351 * this to user-level; it confuses applications.
352 *
353 * XXX this will go away when the SADB is redone.
354 */
355 if (*error == ENOENT)
356 *error = 0;
357 splx(s);
358 goto reinjected;
359 } else { /* sp == NULL */
360 splx(s);
361
362 if (*error != 0) {
363 /*
364 * Hack: -EINVAL is used to signal that a packet
365 * should be silently discarded. This is typically
366 * because we asked key management for an SA and
367 * it was delayed (e.g. kicked up to IKE).
368 */
369 if (*error == -EINVAL)
370 *error = 0;
371 goto bad;
372 } else {
373 /* No IPsec processing for this packet. */
374 }
375#ifdef notyet
376 /*
377 * If deferred crypto processing is needed, check that
378 * the interface supports it.
379 */
380 mtag = m_tag_find(*m, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL);
381 if (mtag != NULL && ((*ifp)->if_capenable & IFCAP_IPSEC) == 0) {
382 /* notify IPsec to do its own crypto */
383 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1));
384 *error = EHOSTUNREACH;
385 goto bad;
386 }
387#endif
388 }
389done:
390 if (sp != NULL)
391 KEY_FREESP(&sp);
392 return 0;
393reinjected:
394 if (sp != NULL)
395 KEY_FREESP(&sp);
396 return -1;
397bad:
398 if (sp != NULL)
399 KEY_FREESP(&sp);
400 return 1;
401#endif /* IPSEC */
402 return 0;
403}
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