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Don't create DCE for bad MTU.
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--- old/usr/src/uts/common/inet/ip/ip6.c
+++ new/usr/src/uts/common/inet/ip/ip6.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright (c) 1990 Mentat Inc.
24 24 * Copyright 2017 OmniTI Computer Consulting, Inc. All rights reserved.
25 25 */
26 26
27 27 #include <sys/types.h>
28 28 #include <sys/stream.h>
29 29 #include <sys/dlpi.h>
30 30 #include <sys/stropts.h>
31 31 #include <sys/sysmacros.h>
32 32 #include <sys/strsun.h>
33 33 #include <sys/strlog.h>
34 34 #include <sys/strsubr.h>
35 35 #define _SUN_TPI_VERSION 2
36 36 #include <sys/tihdr.h>
37 37 #include <sys/ddi.h>
38 38 #include <sys/sunddi.h>
39 39 #include <sys/cmn_err.h>
40 40 #include <sys/debug.h>
41 41 #include <sys/sdt.h>
42 42 #include <sys/kobj.h>
43 43 #include <sys/zone.h>
44 44 #include <sys/neti.h>
45 45 #include <sys/hook.h>
46 46
47 47 #include <sys/kmem.h>
48 48 #include <sys/systm.h>
49 49 #include <sys/param.h>
50 50 #include <sys/socket.h>
51 51 #include <sys/vtrace.h>
52 52 #include <sys/isa_defs.h>
53 53 #include <sys/atomic.h>
54 54 #include <sys/policy.h>
55 55 #include <sys/mac.h>
56 56 #include <net/if.h>
57 57 #include <net/if_types.h>
58 58 #include <net/route.h>
59 59 #include <net/if_dl.h>
60 60 #include <sys/sockio.h>
61 61 #include <netinet/in.h>
62 62 #include <netinet/ip6.h>
63 63 #include <netinet/icmp6.h>
64 64 #include <netinet/sctp.h>
65 65
66 66 #include <inet/common.h>
67 67 #include <inet/mi.h>
68 68 #include <inet/optcom.h>
69 69 #include <inet/mib2.h>
70 70 #include <inet/nd.h>
71 71 #include <inet/arp.h>
72 72
73 73 #include <inet/ip.h>
74 74 #include <inet/ip_impl.h>
75 75 #include <inet/ip6.h>
76 76 #include <inet/ip6_asp.h>
77 77 #include <inet/tcp.h>
78 78 #include <inet/tcp_impl.h>
79 79 #include <inet/udp_impl.h>
80 80 #include <inet/ipp_common.h>
81 81
82 82 #include <inet/ip_multi.h>
83 83 #include <inet/ip_if.h>
84 84 #include <inet/ip_ire.h>
85 85 #include <inet/ip_rts.h>
86 86 #include <inet/ip_ndp.h>
87 87 #include <net/pfkeyv2.h>
88 88 #include <inet/sadb.h>
89 89 #include <inet/ipsec_impl.h>
90 90 #include <inet/iptun/iptun_impl.h>
91 91 #include <inet/sctp_ip.h>
92 92 #include <sys/pattr.h>
93 93 #include <inet/ipclassifier.h>
94 94 #include <inet/ipsecah.h>
95 95 #include <inet/rawip_impl.h>
96 96 #include <inet/rts_impl.h>
97 97 #include <sys/squeue_impl.h>
98 98 #include <sys/squeue.h>
99 99
100 100 #include <sys/tsol/label.h>
101 101 #include <sys/tsol/tnet.h>
102 102
103 103 /* Temporary; for CR 6451644 work-around */
104 104 #include <sys/ethernet.h>
105 105
106 106 /*
107 107 * Naming conventions:
108 108 * These rules should be judiciously applied
109 109 * if there is a need to identify something as IPv6 versus IPv4
110 110 * IPv6 funcions will end with _v6 in the ip module.
111 111 * IPv6 funcions will end with _ipv6 in the transport modules.
112 112 * IPv6 macros:
113 113 * Some macros end with _V6; e.g. ILL_FRAG_HASH_V6
114 114 * Some macros start with V6_; e.g. V6_OR_V4_INADDR_ANY
115 115 * And then there are ..V4_PART_OF_V6.
116 116 * The intent is that macros in the ip module end with _V6.
117 117 * IPv6 global variables will start with ipv6_
118 118 * IPv6 structures will start with ipv6
119 119 * IPv6 defined constants should start with IPV6_
120 120 * (but then there are NDP_DEFAULT_VERS_PRI_AND_FLOW, etc)
121 121 */
122 122
123 123 /*
124 124 * ip6opt_ls is used to enable IPv6 (via /etc/system on TX systems).
125 125 * We need to do this because we didn't obtain the IP6OPT_LS (0x0a)
126 126 * from IANA. This mechanism will remain in effect until an official
127 127 * number is obtained.
128 128 */
129 129 uchar_t ip6opt_ls;
130 130
131 131 const in6_addr_t ipv6_all_ones =
132 132 { 0xffffffffU, 0xffffffffU, 0xffffffffU, 0xffffffffU };
133 133 const in6_addr_t ipv6_all_zeros = { 0, 0, 0, 0 };
134 134
135 135 #ifdef _BIG_ENDIAN
136 136 const in6_addr_t ipv6_unspecified_group = { 0xff000000U, 0, 0, 0 };
137 137 #else /* _BIG_ENDIAN */
138 138 const in6_addr_t ipv6_unspecified_group = { 0x000000ffU, 0, 0, 0 };
139 139 #endif /* _BIG_ENDIAN */
140 140
141 141 #ifdef _BIG_ENDIAN
142 142 const in6_addr_t ipv6_loopback = { 0, 0, 0, 0x00000001U };
143 143 #else /* _BIG_ENDIAN */
144 144 const in6_addr_t ipv6_loopback = { 0, 0, 0, 0x01000000U };
145 145 #endif /* _BIG_ENDIAN */
146 146
147 147 #ifdef _BIG_ENDIAN
148 148 const in6_addr_t ipv6_all_hosts_mcast = { 0xff020000U, 0, 0, 0x00000001U };
149 149 #else /* _BIG_ENDIAN */
150 150 const in6_addr_t ipv6_all_hosts_mcast = { 0x000002ffU, 0, 0, 0x01000000U };
151 151 #endif /* _BIG_ENDIAN */
152 152
153 153 #ifdef _BIG_ENDIAN
154 154 const in6_addr_t ipv6_all_rtrs_mcast = { 0xff020000U, 0, 0, 0x00000002U };
155 155 #else /* _BIG_ENDIAN */
156 156 const in6_addr_t ipv6_all_rtrs_mcast = { 0x000002ffU, 0, 0, 0x02000000U };
157 157 #endif /* _BIG_ENDIAN */
158 158
159 159 #ifdef _BIG_ENDIAN
160 160 const in6_addr_t ipv6_all_v2rtrs_mcast = { 0xff020000U, 0, 0, 0x00000016U };
161 161 #else /* _BIG_ENDIAN */
162 162 const in6_addr_t ipv6_all_v2rtrs_mcast = { 0x000002ffU, 0, 0, 0x16000000U };
163 163 #endif /* _BIG_ENDIAN */
164 164
165 165 #ifdef _BIG_ENDIAN
166 166 const in6_addr_t ipv6_solicited_node_mcast =
167 167 { 0xff020000U, 0, 0x00000001U, 0xff000000U };
168 168 #else /* _BIG_ENDIAN */
169 169 const in6_addr_t ipv6_solicited_node_mcast =
170 170 { 0x000002ffU, 0, 0x01000000U, 0x000000ffU };
171 171 #endif /* _BIG_ENDIAN */
172 172
173 173 static boolean_t icmp_inbound_verify_v6(mblk_t *, icmp6_t *, ip_recv_attr_t *);
174 174 static void icmp_inbound_too_big_v6(icmp6_t *, ip_recv_attr_t *);
175 175 static void icmp_pkt_v6(mblk_t *, void *, size_t, const in6_addr_t *,
176 176 ip_recv_attr_t *);
177 177 static void icmp_redirect_v6(mblk_t *, ip6_t *, nd_redirect_t *,
178 178 ip_recv_attr_t *);
179 179 static void icmp_send_redirect_v6(mblk_t *, in6_addr_t *,
180 180 in6_addr_t *, ip_recv_attr_t *);
181 181 static void icmp_send_reply_v6(mblk_t *, ip6_t *, icmp6_t *,
182 182 ip_recv_attr_t *);
183 183 static boolean_t ip_source_routed_v6(ip6_t *, mblk_t *, ip_stack_t *);
184 184
185 185 /*
186 186 * icmp_inbound_v6 deals with ICMP messages that are handled by IP.
187 187 * If the ICMP message is consumed by IP, i.e., it should not be delivered
188 188 * to any IPPROTO_ICMP raw sockets, then it returns NULL.
189 189 * Likewise, if the ICMP error is misformed (too short, etc), then it
190 190 * returns NULL. The caller uses this to determine whether or not to send
191 191 * to raw sockets.
192 192 *
193 193 * All error messages are passed to the matching transport stream.
194 194 *
195 195 * See comment for icmp_inbound_v4() on how IPsec is handled.
196 196 */
197 197 mblk_t *
198 198 icmp_inbound_v6(mblk_t *mp, ip_recv_attr_t *ira)
199 199 {
200 200 icmp6_t *icmp6;
201 201 ip6_t *ip6h; /* Outer header */
202 202 int ip_hdr_length; /* Outer header length */
203 203 boolean_t interested;
204 204 ill_t *ill = ira->ira_ill;
205 205 ip_stack_t *ipst = ill->ill_ipst;
206 206 mblk_t *mp_ret = NULL;
207 207
208 208 ip6h = (ip6_t *)mp->b_rptr;
209 209
210 210 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInMsgs);
211 211
212 212 /* Check for Martian packets */
213 213 if (IN6_IS_ADDR_MULTICAST(&ip6h->ip6_src)) {
214 214 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInAddrErrors);
215 215 ip_drop_input("ipIfStatsInAddrErrors: mcast src", mp, ill);
216 216 freemsg(mp);
217 217 return (NULL);
218 218 }
219 219
220 220 /* Make sure ira_l2src is set for ndp_input */
221 221 if (!(ira->ira_flags & IRAF_L2SRC_SET))
222 222 ip_setl2src(mp, ira, ira->ira_rill);
223 223
224 224 ip_hdr_length = ira->ira_ip_hdr_length;
225 225 if ((mp->b_wptr - mp->b_rptr) < (ip_hdr_length + ICMP6_MINLEN)) {
226 226 if (ira->ira_pktlen < (ip_hdr_length + ICMP6_MINLEN)) {
227 227 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInTruncatedPkts);
228 228 ip_drop_input("ipIfStatsInTruncatedPkts", mp, ill);
229 229 freemsg(mp);
230 230 return (NULL);
231 231 }
232 232 ip6h = ip_pullup(mp, ip_hdr_length + ICMP6_MINLEN, ira);
233 233 if (ip6h == NULL) {
234 234 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInErrors);
235 235 freemsg(mp);
236 236 return (NULL);
237 237 }
238 238 }
239 239
240 240 icmp6 = (icmp6_t *)(&mp->b_rptr[ip_hdr_length]);
241 241 DTRACE_PROBE2(icmp__inbound__v6, ip6_t *, ip6h, icmp6_t *, icmp6);
242 242 ip2dbg(("icmp_inbound_v6: type %d code %d\n", icmp6->icmp6_type,
243 243 icmp6->icmp6_code));
244 244
245 245 /*
246 246 * We will set "interested" to "true" if we should pass a copy to
247 247 * the transport i.e., if it is an error message.
248 248 */
249 249 interested = !(icmp6->icmp6_type & ICMP6_INFOMSG_MASK);
250 250
251 251 switch (icmp6->icmp6_type) {
252 252 case ICMP6_DST_UNREACH:
253 253 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInDestUnreachs);
254 254 if (icmp6->icmp6_code == ICMP6_DST_UNREACH_ADMIN)
255 255 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInAdminProhibs);
256 256 break;
257 257
258 258 case ICMP6_TIME_EXCEEDED:
259 259 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInTimeExcds);
260 260 break;
261 261
262 262 case ICMP6_PARAM_PROB:
263 263 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInParmProblems);
264 264 break;
265 265
266 266 case ICMP6_PACKET_TOO_BIG:
267 267 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInPktTooBigs);
268 268 break;
269 269
270 270 case ICMP6_ECHO_REQUEST:
271 271 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInEchos);
272 272 if (IN6_IS_ADDR_MULTICAST(&ip6h->ip6_dst) &&
273 273 !ipst->ips_ipv6_resp_echo_mcast)
274 274 break;
275 275
276 276 /*
277 277 * We must have exclusive use of the mblk to convert it to
278 278 * a response.
279 279 * If not, we copy it.
280 280 */
281 281 if (mp->b_datap->db_ref > 1) {
282 282 mblk_t *mp1;
283 283
284 284 mp1 = copymsg(mp);
285 285 if (mp1 == NULL) {
286 286 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
287 287 ip_drop_input("ipIfStatsInDiscards - copymsg",
288 288 mp, ill);
289 289 freemsg(mp);
290 290 return (NULL);
291 291 }
292 292 freemsg(mp);
293 293 mp = mp1;
294 294 ip6h = (ip6_t *)mp->b_rptr;
295 295 icmp6 = (icmp6_t *)(&mp->b_rptr[ip_hdr_length]);
296 296 }
297 297
298 298 icmp6->icmp6_type = ICMP6_ECHO_REPLY;
299 299 icmp_send_reply_v6(mp, ip6h, icmp6, ira);
300 300 return (NULL);
301 301
302 302 case ICMP6_ECHO_REPLY:
303 303 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInEchoReplies);
304 304 break;
305 305
306 306 case ND_ROUTER_SOLICIT:
307 307 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInRouterSolicits);
308 308 break;
309 309
310 310 case ND_ROUTER_ADVERT:
311 311 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInRouterAdvertisements);
312 312 break;
313 313
314 314 case ND_NEIGHBOR_SOLICIT:
315 315 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInNeighborSolicits);
316 316 ndp_input(mp, ira);
317 317 return (NULL);
318 318
319 319 case ND_NEIGHBOR_ADVERT:
320 320 BUMP_MIB(ill->ill_icmp6_mib,
321 321 ipv6IfIcmpInNeighborAdvertisements);
322 322 ndp_input(mp, ira);
323 323 return (NULL);
324 324
325 325 case ND_REDIRECT:
326 326 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInRedirects);
327 327
328 328 if (ipst->ips_ipv6_ignore_redirect)
329 329 break;
330 330
331 331 /* We now allow a RAW socket to receive this. */
332 332 interested = B_TRUE;
333 333 break;
334 334
335 335 /*
336 336 * The next three icmp messages will be handled by MLD.
337 337 * Pass all valid MLD packets up to any process(es)
338 338 * listening on a raw ICMP socket.
339 339 */
340 340 case MLD_LISTENER_QUERY:
341 341 case MLD_LISTENER_REPORT:
342 342 case MLD_LISTENER_REDUCTION:
343 343 mp = mld_input(mp, ira);
344 344 return (mp);
345 345 default:
346 346 break;
347 347 }
348 348 /*
349 349 * See if there is an ICMP client to avoid an extra copymsg/freemsg
350 350 * if there isn't one.
351 351 */
352 352 if (ipst->ips_ipcl_proto_fanout_v6[IPPROTO_ICMPV6].connf_head != NULL) {
353 353 /* If there is an ICMP client and we want one too, copy it. */
354 354
355 355 if (!interested) {
356 356 /* Caller will deliver to RAW sockets */
357 357 return (mp);
358 358 }
359 359 mp_ret = copymsg(mp);
360 360 if (mp_ret == NULL) {
361 361 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
362 362 ip_drop_input("ipIfStatsInDiscards - copymsg", mp, ill);
363 363 }
364 364 } else if (!interested) {
365 365 /* Neither we nor raw sockets are interested. Drop packet now */
366 366 freemsg(mp);
367 367 return (NULL);
368 368 }
369 369
370 370 /*
371 371 * ICMP error or redirect packet. Make sure we have enough of
372 372 * the header and that db_ref == 1 since we might end up modifying
373 373 * the packet.
374 374 */
375 375 if (mp->b_cont != NULL) {
376 376 if (ip_pullup(mp, -1, ira) == NULL) {
377 377 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
378 378 ip_drop_input("ipIfStatsInDiscards - ip_pullup",
379 379 mp, ill);
380 380 freemsg(mp);
381 381 return (mp_ret);
382 382 }
383 383 }
384 384
385 385 if (mp->b_datap->db_ref > 1) {
386 386 mblk_t *mp1;
387 387
388 388 mp1 = copymsg(mp);
389 389 if (mp1 == NULL) {
390 390 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
391 391 ip_drop_input("ipIfStatsInDiscards - copymsg", mp, ill);
392 392 freemsg(mp);
393 393 return (mp_ret);
394 394 }
395 395 freemsg(mp);
396 396 mp = mp1;
397 397 }
398 398
399 399 /*
400 400 * In case mp has changed, verify the message before any further
401 401 * processes.
402 402 */
403 403 ip6h = (ip6_t *)mp->b_rptr;
404 404 icmp6 = (icmp6_t *)(&mp->b_rptr[ip_hdr_length]);
405 405 if (!icmp_inbound_verify_v6(mp, icmp6, ira)) {
406 406 freemsg(mp);
407 407 return (mp_ret);
408 408 }
409 409
410 410 switch (icmp6->icmp6_type) {
411 411 case ND_REDIRECT:
412 412 icmp_redirect_v6(mp, ip6h, (nd_redirect_t *)icmp6, ira);
413 413 break;
414 414 case ICMP6_PACKET_TOO_BIG:
415 415 /* Update DCE and adjust MTU is icmp header if needed */
416 416 icmp_inbound_too_big_v6(icmp6, ira);
417 417 /* FALLTHRU */
418 418 default:
419 419 icmp_inbound_error_fanout_v6(mp, icmp6, ira);
420 420 break;
421 421 }
422 422
423 423 return (mp_ret);
424 424 }
425 425
426 426 /*
427 427 * Send an ICMP echo reply.
428 428 * The caller has already updated the payload part of the packet.
429 429 * We handle the ICMP checksum, IP source address selection and feed
430 430 * the packet into ip_output_simple.
431 431 */
432 432 static void
433 433 icmp_send_reply_v6(mblk_t *mp, ip6_t *ip6h, icmp6_t *icmp6,
434 434 ip_recv_attr_t *ira)
435 435 {
436 436 uint_t ip_hdr_length = ira->ira_ip_hdr_length;
437 437 ill_t *ill = ira->ira_ill;
438 438 ip_stack_t *ipst = ill->ill_ipst;
439 439 ip_xmit_attr_t ixas;
440 440 in6_addr_t origsrc;
441 441
442 442 /*
443 443 * Remove any extension headers (do not reverse a source route)
444 444 * and clear the flow id (keep traffic class for now).
445 445 */
446 446 if (ip_hdr_length != IPV6_HDR_LEN) {
447 447 int i;
448 448
449 449 for (i = 0; i < IPV6_HDR_LEN; i++) {
450 450 mp->b_rptr[ip_hdr_length - i - 1] =
451 451 mp->b_rptr[IPV6_HDR_LEN - i - 1];
452 452 }
453 453 mp->b_rptr += (ip_hdr_length - IPV6_HDR_LEN);
454 454 ip6h = (ip6_t *)mp->b_rptr;
455 455 ip6h->ip6_nxt = IPPROTO_ICMPV6;
456 456 i = ntohs(ip6h->ip6_plen);
457 457 i -= (ip_hdr_length - IPV6_HDR_LEN);
458 458 ip6h->ip6_plen = htons(i);
459 459 ip_hdr_length = IPV6_HDR_LEN;
460 460 ASSERT(ntohs(ip6h->ip6_plen) + IPV6_HDR_LEN == msgdsize(mp));
461 461 }
462 462 ip6h->ip6_vcf &= ~IPV6_FLOWINFO_FLOWLABEL;
463 463
464 464 /* Reverse the source and destination addresses. */
465 465 origsrc = ip6h->ip6_src;
466 466 ip6h->ip6_src = ip6h->ip6_dst;
467 467 ip6h->ip6_dst = origsrc;
468 468
469 469 /* set the hop limit */
470 470 ip6h->ip6_hops = ipst->ips_ipv6_def_hops;
471 471
472 472 /*
473 473 * Prepare for checksum by putting icmp length in the icmp
474 474 * checksum field. The checksum is calculated in ip_output
475 475 */
476 476 icmp6->icmp6_cksum = ip6h->ip6_plen;
477 477
478 478 bzero(&ixas, sizeof (ixas));
479 479 ixas.ixa_flags = IXAF_BASIC_SIMPLE_V6;
480 480 ixas.ixa_zoneid = ira->ira_zoneid;
481 481 ixas.ixa_cred = kcred;
482 482 ixas.ixa_cpid = NOPID;
483 483 ixas.ixa_tsl = ira->ira_tsl; /* Behave as a multi-level responder */
484 484 ixas.ixa_ifindex = 0;
485 485 ixas.ixa_ipst = ipst;
486 486 ixas.ixa_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
487 487
488 488 if (!(ira->ira_flags & IRAF_IPSEC_SECURE)) {
489 489 /*
490 490 * This packet should go out the same way as it
491 491 * came in i.e in clear, independent of the IPsec
492 492 * policy for transmitting packets.
493 493 */
494 494 ixas.ixa_flags |= IXAF_NO_IPSEC;
495 495 } else {
496 496 if (!ipsec_in_to_out(ira, &ixas, mp, NULL, ip6h)) {
497 497 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
498 498 /* Note: mp already consumed and ip_drop_packet done */
499 499 return;
500 500 }
501 501 }
502 502
503 503 /* Was the destination (now source) link-local? Send out same group */
504 504 if (IN6_IS_ADDR_LINKSCOPE(&ip6h->ip6_src)) {
505 505 ixas.ixa_flags |= IXAF_SCOPEID_SET;
506 506 if (IS_UNDER_IPMP(ill))
507 507 ixas.ixa_scopeid = ill_get_upper_ifindex(ill);
508 508 else
509 509 ixas.ixa_scopeid = ill->ill_phyint->phyint_ifindex;
510 510 }
511 511
512 512 if (ira->ira_flags & IRAF_MULTIBROADCAST) {
513 513 /*
514 514 * Not one or our addresses (IRE_LOCALs), thus we let
515 515 * ip_output_simple pick the source.
516 516 */
517 517 ip6h->ip6_src = ipv6_all_zeros;
518 518 ixas.ixa_flags |= IXAF_SET_SOURCE;
519 519 }
520 520
521 521 /* Should we send using dce_pmtu? */
522 522 if (ipst->ips_ipv6_icmp_return_pmtu)
523 523 ixas.ixa_flags |= IXAF_PMTU_DISCOVERY;
524 524
525 525 (void) ip_output_simple(mp, &ixas);
526 526 ixa_cleanup(&ixas);
527 527
528 528 }
529 529
530 530 /*
531 531 * Verify the ICMP messages for either for ICMP error or redirect packet.
532 532 * The caller should have fully pulled up the message. If it's a redirect
533 533 * packet, only basic checks on IP header will be done; otherwise, verify
534 534 * the packet by looking at the included ULP header.
535 535 *
536 536 * Called before icmp_inbound_error_fanout_v6 is called.
537 537 */
538 538 static boolean_t
539 539 icmp_inbound_verify_v6(mblk_t *mp, icmp6_t *icmp6, ip_recv_attr_t *ira)
540 540 {
541 541 ill_t *ill = ira->ira_ill;
542 542 uint16_t hdr_length;
543 543 uint8_t *nexthdrp;
544 544 uint8_t nexthdr;
545 545 ip_stack_t *ipst = ill->ill_ipst;
546 546 conn_t *connp;
547 547 ip6_t *ip6h; /* Inner header */
548 548
549 549 ip6h = (ip6_t *)&icmp6[1];
550 550 if ((uchar_t *)ip6h + IPV6_HDR_LEN > mp->b_wptr)
551 551 goto truncated;
552 552
553 553 if (icmp6->icmp6_type == ND_REDIRECT) {
554 554 hdr_length = sizeof (nd_redirect_t);
555 555 } else {
556 556 if ((IPH_HDR_VERSION(ip6h) != IPV6_VERSION))
557 557 goto discard_pkt;
558 558 hdr_length = IPV6_HDR_LEN;
559 559 }
560 560
561 561 if ((uchar_t *)ip6h + hdr_length > mp->b_wptr)
562 562 goto truncated;
563 563
564 564 /*
565 565 * Stop here for ICMP_REDIRECT.
566 566 */
567 567 if (icmp6->icmp6_type == ND_REDIRECT)
568 568 return (B_TRUE);
569 569
570 570 /*
571 571 * ICMP errors only.
572 572 */
573 573 if (!ip_hdr_length_nexthdr_v6(mp, ip6h, &hdr_length, &nexthdrp))
574 574 goto discard_pkt;
575 575 nexthdr = *nexthdrp;
576 576
577 577 /* Try to pass the ICMP message to clients who need it */
578 578 switch (nexthdr) {
579 579 case IPPROTO_UDP:
580 580 /*
581 581 * Verify we have at least ICMP_MIN_TP_HDR_LEN bytes of
582 582 * transport header.
583 583 */
584 584 if ((uchar_t *)ip6h + hdr_length + ICMP_MIN_TP_HDR_LEN >
585 585 mp->b_wptr)
586 586 goto truncated;
587 587 break;
588 588 case IPPROTO_TCP: {
589 589 tcpha_t *tcpha;
590 590
591 591 /*
592 592 * Verify we have at least ICMP_MIN_TP_HDR_LEN bytes of
593 593 * transport header.
594 594 */
595 595 if ((uchar_t *)ip6h + hdr_length + ICMP_MIN_TP_HDR_LEN >
596 596 mp->b_wptr)
597 597 goto truncated;
598 598
599 599 tcpha = (tcpha_t *)((uchar_t *)ip6h + hdr_length);
600 600 /*
601 601 * With IPMP we need to match across group, which we do
602 602 * since we have the upper ill from ira_ill.
603 603 */
604 604 connp = ipcl_tcp_lookup_reversed_ipv6(ip6h, tcpha, TCPS_LISTEN,
605 605 ill->ill_phyint->phyint_ifindex, ipst);
606 606 if (connp == NULL)
607 607 goto discard_pkt;
608 608
609 609 if ((connp->conn_verifyicmp != NULL) &&
610 610 !connp->conn_verifyicmp(connp, tcpha, NULL, icmp6, ira)) {
611 611 CONN_DEC_REF(connp);
612 612 goto discard_pkt;
613 613 }
614 614 CONN_DEC_REF(connp);
615 615 break;
616 616 }
617 617 case IPPROTO_SCTP:
618 618 /*
619 619 * Verify we have at least ICMP_MIN_TP_HDR_LEN bytes of
620 620 * transport header.
621 621 */
622 622 if ((uchar_t *)ip6h + hdr_length + ICMP_MIN_TP_HDR_LEN >
623 623 mp->b_wptr)
624 624 goto truncated;
625 625 break;
626 626 case IPPROTO_ESP:
627 627 case IPPROTO_AH:
628 628 break;
629 629 case IPPROTO_ENCAP:
630 630 case IPPROTO_IPV6: {
631 631 /* Look for self-encapsulated packets that caused an error */
632 632 ip6_t *in_ip6h;
633 633
634 634 in_ip6h = (ip6_t *)((uint8_t *)ip6h + hdr_length);
635 635 if ((uint8_t *)in_ip6h + (nexthdr == IPPROTO_ENCAP ?
636 636 sizeof (ipha_t) : sizeof (ip6_t)) > mp->b_wptr)
637 637 goto truncated;
638 638 break;
639 639 }
640 640 default:
641 641 break;
642 642 }
643 643
644 644 return (B_TRUE);
645 645
646 646 discard_pkt:
647 647 /* Bogus ICMP error. */
648 648 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
649 649 return (B_FALSE);
650 650
651 651 truncated:
652 652 /* We pulled up everthing already. Must be truncated */
653 653 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInErrors);
654 654 return (B_FALSE);
655 655 }
656 656
657 657 /*
658 658 * Process received IPv6 ICMP Packet too big.
659 659 * The caller is responsible for validating the packet before passing it in
660 660 * and also to fanout the ICMP error to any matching transport conns. Assumes
661 661 * the message has been fully pulled up.
662 662 *
663 663 * Before getting here, the caller has called icmp_inbound_verify_v6()
664 664 * that should have verified with ULP to prevent undoing the changes we're
665 665 * going to make to DCE. For example, TCP might have verified that the packet
666 666 * which generated error is in the send window.
667 667 *
668 668 * In some cases modified this MTU in the ICMP header packet; the caller
669 669 * should pass to the matching ULP after this returns.
670 670 */
671 671 static void
672 672 icmp_inbound_too_big_v6(icmp6_t *icmp6, ip_recv_attr_t *ira)
673 673 {
674 674 uint32_t mtu;
675 675 dce_t *dce;
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675 lines elided |
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676 676 ill_t *ill = ira->ira_ill; /* Upper ill if IPMP */
677 677 ip_stack_t *ipst = ill->ill_ipst;
678 678 int old_max_frag;
679 679 in6_addr_t final_dst;
680 680 ip6_t *ip6h; /* Inner IP header */
681 681
682 682 /* Caller has already pulled up everything. */
683 683 ip6h = (ip6_t *)&icmp6[1];
684 684 final_dst = ip_get_dst_v6(ip6h, NULL, NULL);
685 685
686 + mtu = ntohl(icmp6->icmp6_mtu);
687 + if (mtu < IPV6_MIN_MTU) {
688 + /*
689 + * RFC 8021 suggests to ignore messages where mtu is
690 + * less than the IPv6 minimum.
691 + */
692 + ip1dbg(("Received mtu less than IPv6 "
693 + "min mtu %d: %d\n", IPV6_MIN_MTU, mtu));
694 + DTRACE_PROBE1(icmp6__too__small__mtu, uint32_t, mtu);
695 + return;
696 + }
697 +
686 698 /*
687 699 * For link local destinations matching simply on address is not
688 700 * sufficient. Same link local addresses for different ILL's is
689 701 * possible.
690 702 */
691 703 if (IN6_IS_ADDR_LINKSCOPE(&final_dst)) {
692 704 dce = dce_lookup_and_add_v6(&final_dst,
693 705 ill->ill_phyint->phyint_ifindex, ipst);
694 706 } else {
695 707 dce = dce_lookup_and_add_v6(&final_dst, 0, ipst);
696 708 }
697 709 if (dce == NULL) {
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698 710 /* Couldn't add a unique one - ENOMEM */
699 711 if (ip_debug > 2) {
700 712 /* ip1dbg */
701 713 pr_addr_dbg("icmp_inbound_too_big_v6:"
702 714 "no dce for dst %s\n", AF_INET6,
703 715 &final_dst);
704 716 }
705 717 return;
706 718 }
707 719
708 - mtu = ntohl(icmp6->icmp6_mtu);
709 -
710 720 mutex_enter(&dce->dce_lock);
711 721 if (dce->dce_flags & DCEF_PMTU)
712 722 old_max_frag = dce->dce_pmtu;
713 723 else if (IN6_IS_ADDR_MULTICAST(&final_dst))
714 724 old_max_frag = ill->ill_mc_mtu;
715 725 else
716 726 old_max_frag = ill->ill_mtu;
717 727
718 - if (mtu >= IPV6_MIN_MTU) {
719 - ip1dbg(("Received mtu from router: %d\n", mtu));
720 - DTRACE_PROBE1(icmp6__received__mtu, uint32_t, mtu);
721 - dce->dce_pmtu = MIN(old_max_frag, mtu);
722 - icmp6->icmp6_mtu = htonl(dce->dce_pmtu);
728 + ip1dbg(("Received mtu from router: %d\n", mtu));
729 + DTRACE_PROBE1(icmp6__received__mtu, uint32_t, mtu);
730 + dce->dce_pmtu = MIN(old_max_frag, mtu);
731 + icmp6->icmp6_mtu = htonl(dce->dce_pmtu);
723 732
724 - /* We now have a PMTU for sure */
725 - dce->dce_flags |= DCEF_PMTU;
726 - dce->dce_last_change_time = TICK_TO_SEC(ddi_get_lbolt64());
727 - } else {
728 - /*
729 - * RFC 8021 suggests to ignore messages where mtu is
730 - * less than the IPv6 minimum.
731 - */
732 - ip1dbg(("Received mtu less than IPv6 "
733 - "min mtu %d: %d\n", IPV6_MIN_MTU, mtu));
734 - DTRACE_PROBE1(icmp6__too__small__mtu, uint32_t, mtu);
735 - }
733 + /* We now have a PMTU for sure */
734 + dce->dce_flags |= DCEF_PMTU;
735 + dce->dce_last_change_time = TICK_TO_SEC(ddi_get_lbolt64());
736 736
737 737 mutex_exit(&dce->dce_lock);
738 738 /*
739 739 * After dropping the lock the new value is visible to everyone.
740 740 * Then we bump the generation number so any cached values reinspect
741 741 * the dce_t.
742 742 */
743 743 dce_increment_generation(dce);
744 744 dce_refrele(dce);
745 745 }
746 746
747 747 /*
748 748 * Fanout received ICMPv6 error packets to the transports.
749 749 * Assumes the IPv6 plus ICMPv6 headers have been pulled up but nothing else.
750 750 *
751 751 * The caller must have called icmp_inbound_verify_v6.
752 752 */
753 753 void
754 754 icmp_inbound_error_fanout_v6(mblk_t *mp, icmp6_t *icmp6, ip_recv_attr_t *ira)
755 755 {
756 756 uint16_t *up; /* Pointer to ports in ULP header */
757 757 uint32_t ports; /* reversed ports for fanout */
758 758 ip6_t rip6h; /* With reversed addresses */
759 759 ip6_t *ip6h; /* Inner IP header */
760 760 uint16_t hdr_length; /* Inner IP header length */
761 761 uint8_t *nexthdrp;
762 762 uint8_t nexthdr;
763 763 tcpha_t *tcpha;
764 764 conn_t *connp;
765 765 ill_t *ill = ira->ira_ill; /* Upper in the case of IPMP */
766 766 ip_stack_t *ipst = ill->ill_ipst;
767 767 ipsec_stack_t *ipss = ipst->ips_netstack->netstack_ipsec;
768 768
769 769 /* Caller has already pulled up everything. */
770 770 ip6h = (ip6_t *)&icmp6[1];
771 771 ASSERT(mp->b_cont == NULL);
772 772 ASSERT((uchar_t *)&ip6h[1] <= mp->b_wptr);
773 773
774 774 if (!ip_hdr_length_nexthdr_v6(mp, ip6h, &hdr_length, &nexthdrp))
775 775 goto drop_pkt;
776 776 nexthdr = *nexthdrp;
777 777 ira->ira_protocol = nexthdr;
778 778
779 779 /*
780 780 * We need a separate IP header with the source and destination
781 781 * addresses reversed to do fanout/classification because the ip6h in
782 782 * the ICMPv6 error is in the form we sent it out.
783 783 */
784 784 rip6h.ip6_src = ip6h->ip6_dst;
785 785 rip6h.ip6_dst = ip6h->ip6_src;
786 786 rip6h.ip6_nxt = nexthdr;
787 787
788 788 /* Try to pass the ICMP message to clients who need it */
789 789 switch (nexthdr) {
790 790 case IPPROTO_UDP: {
791 791 /* Attempt to find a client stream based on port. */
792 792 up = (uint16_t *)((uchar_t *)ip6h + hdr_length);
793 793
794 794 /* Note that we send error to all matches. */
795 795 ira->ira_flags |= IRAF_ICMP_ERROR;
796 796 ip_fanout_udp_multi_v6(mp, &rip6h, up[0], up[1], ira);
797 797 ira->ira_flags &= ~IRAF_ICMP_ERROR;
798 798 return;
799 799 }
800 800 case IPPROTO_TCP: {
801 801 /*
802 802 * Attempt to find a client stream based on port.
803 803 * Note that we do a reverse lookup since the header is
804 804 * in the form we sent it out.
805 805 */
806 806 tcpha = (tcpha_t *)((uchar_t *)ip6h + hdr_length);
807 807 /*
808 808 * With IPMP we need to match across group, which we do
809 809 * since we have the upper ill from ira_ill.
810 810 */
811 811 connp = ipcl_tcp_lookup_reversed_ipv6(ip6h, tcpha,
812 812 TCPS_LISTEN, ill->ill_phyint->phyint_ifindex, ipst);
813 813 if (connp == NULL) {
814 814 goto drop_pkt;
815 815 }
816 816
817 817 if (CONN_INBOUND_POLICY_PRESENT_V6(connp, ipss) ||
818 818 (ira->ira_flags & IRAF_IPSEC_SECURE)) {
819 819 mp = ipsec_check_inbound_policy(mp, connp,
820 820 NULL, ip6h, ira);
821 821 if (mp == NULL) {
822 822 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
823 823 /* Note that mp is NULL */
824 824 ip_drop_input("ipIfStatsInDiscards", mp, ill);
825 825 CONN_DEC_REF(connp);
826 826 return;
827 827 }
828 828 }
829 829
830 830 ira->ira_flags |= IRAF_ICMP_ERROR;
831 831 if (IPCL_IS_TCP(connp)) {
832 832 SQUEUE_ENTER_ONE(connp->conn_sqp, mp,
833 833 connp->conn_recvicmp, connp, ira, SQ_FILL,
834 834 SQTAG_TCP6_INPUT_ICMP_ERR);
835 835 } else {
836 836 /* Not TCP; must be SOCK_RAW, IPPROTO_TCP */
837 837 ill_t *rill = ira->ira_rill;
838 838
839 839 ira->ira_ill = ira->ira_rill = NULL;
840 840 (connp->conn_recv)(connp, mp, NULL, ira);
841 841 CONN_DEC_REF(connp);
842 842 ira->ira_ill = ill;
843 843 ira->ira_rill = rill;
844 844 }
845 845 ira->ira_flags &= ~IRAF_ICMP_ERROR;
846 846 return;
847 847
848 848 }
849 849 case IPPROTO_SCTP:
850 850 up = (uint16_t *)((uchar_t *)ip6h + hdr_length);
851 851 /* Find a SCTP client stream for this packet. */
852 852 ((uint16_t *)&ports)[0] = up[1];
853 853 ((uint16_t *)&ports)[1] = up[0];
854 854
855 855 ira->ira_flags |= IRAF_ICMP_ERROR;
856 856 ip_fanout_sctp(mp, NULL, &rip6h, ports, ira);
857 857 ira->ira_flags &= ~IRAF_ICMP_ERROR;
858 858 return;
859 859
860 860 case IPPROTO_ESP:
861 861 case IPPROTO_AH:
862 862 if (!ipsec_loaded(ipss)) {
863 863 ip_proto_not_sup(mp, ira);
864 864 return;
865 865 }
866 866
867 867 if (nexthdr == IPPROTO_ESP)
868 868 mp = ipsecesp_icmp_error(mp, ira);
869 869 else
870 870 mp = ipsecah_icmp_error(mp, ira);
871 871 if (mp == NULL)
872 872 return;
873 873
874 874 /* Just in case ipsec didn't preserve the NULL b_cont */
875 875 if (mp->b_cont != NULL) {
876 876 if (!pullupmsg(mp, -1))
877 877 goto drop_pkt;
878 878 }
879 879
880 880 /*
881 881 * If succesful, the mp has been modified to not include
882 882 * the ESP/AH header so we can fanout to the ULP's icmp
883 883 * error handler.
884 884 */
885 885 if (mp->b_wptr - mp->b_rptr < IPV6_HDR_LEN)
886 886 goto drop_pkt;
887 887
888 888 ip6h = (ip6_t *)mp->b_rptr;
889 889 /* Don't call hdr_length_v6() unless you have to. */
890 890 if (ip6h->ip6_nxt != IPPROTO_ICMPV6)
891 891 hdr_length = ip_hdr_length_v6(mp, ip6h);
892 892 else
893 893 hdr_length = IPV6_HDR_LEN;
894 894
895 895 /* Verify the modified message before any further processes. */
896 896 icmp6 = (icmp6_t *)(&mp->b_rptr[hdr_length]);
897 897 if (!icmp_inbound_verify_v6(mp, icmp6, ira)) {
898 898 freemsg(mp);
899 899 return;
900 900 }
901 901
902 902 icmp_inbound_error_fanout_v6(mp, icmp6, ira);
903 903 return;
904 904
905 905 case IPPROTO_IPV6: {
906 906 /* Look for self-encapsulated packets that caused an error */
907 907 ip6_t *in_ip6h;
908 908
909 909 in_ip6h = (ip6_t *)((uint8_t *)ip6h + hdr_length);
910 910
911 911 if (IN6_ARE_ADDR_EQUAL(&in_ip6h->ip6_src, &ip6h->ip6_src) &&
912 912 IN6_ARE_ADDR_EQUAL(&in_ip6h->ip6_dst, &ip6h->ip6_dst)) {
913 913 /*
914 914 * Self-encapsulated case. As in the ipv4 case,
915 915 * we need to strip the 2nd IP header. Since mp
916 916 * is already pulled-up, we can simply bcopy
917 917 * the 3rd header + data over the 2nd header.
918 918 */
919 919 uint16_t unused_len;
920 920
921 921 /*
922 922 * Make sure we don't do recursion more than once.
923 923 */
924 924 if (!ip_hdr_length_nexthdr_v6(mp, in_ip6h,
925 925 &unused_len, &nexthdrp) ||
926 926 *nexthdrp == IPPROTO_IPV6) {
927 927 goto drop_pkt;
928 928 }
929 929
930 930 /*
931 931 * Copy the 3rd header + remaining data on top
932 932 * of the 2nd header.
933 933 */
934 934 bcopy(in_ip6h, ip6h, mp->b_wptr - (uchar_t *)in_ip6h);
935 935
936 936 /*
937 937 * Subtract length of the 2nd header.
938 938 */
939 939 mp->b_wptr -= hdr_length;
940 940
941 941 ip6h = (ip6_t *)mp->b_rptr;
942 942 /* Don't call hdr_length_v6() unless you have to. */
943 943 if (ip6h->ip6_nxt != IPPROTO_ICMPV6)
944 944 hdr_length = ip_hdr_length_v6(mp, ip6h);
945 945 else
946 946 hdr_length = IPV6_HDR_LEN;
947 947
948 948 /*
949 949 * Verify the modified message before any further
950 950 * processes.
951 951 */
952 952 icmp6 = (icmp6_t *)(&mp->b_rptr[hdr_length]);
953 953 if (!icmp_inbound_verify_v6(mp, icmp6, ira)) {
954 954 freemsg(mp);
955 955 return;
956 956 }
957 957
958 958 /*
959 959 * Now recurse, and see what I _really_ should be
960 960 * doing here.
961 961 */
962 962 icmp_inbound_error_fanout_v6(mp, icmp6, ira);
963 963 return;
964 964 }
965 965 /* FALLTHRU */
966 966 }
967 967 case IPPROTO_ENCAP:
968 968 if ((connp = ipcl_iptun_classify_v6(&rip6h.ip6_src,
969 969 &rip6h.ip6_dst, ipst)) != NULL) {
970 970 ira->ira_flags |= IRAF_ICMP_ERROR;
971 971 connp->conn_recvicmp(connp, mp, NULL, ira);
972 972 CONN_DEC_REF(connp);
973 973 ira->ira_flags &= ~IRAF_ICMP_ERROR;
974 974 return;
975 975 }
976 976 /*
977 977 * No IP tunnel is interested, fallthrough and see
978 978 * if a raw socket will want it.
979 979 */
980 980 /* FALLTHRU */
981 981 default:
982 982 ira->ira_flags |= IRAF_ICMP_ERROR;
983 983 ASSERT(ira->ira_protocol == nexthdr);
984 984 ip_fanout_proto_v6(mp, &rip6h, ira);
985 985 ira->ira_flags &= ~IRAF_ICMP_ERROR;
986 986 return;
987 987 }
988 988 /* NOTREACHED */
989 989 drop_pkt:
990 990 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInErrors);
991 991 ip1dbg(("icmp_inbound_error_fanout_v6: drop pkt\n"));
992 992 freemsg(mp);
993 993 }
994 994
995 995 /*
996 996 * Process received IPv6 ICMP Redirect messages.
997 997 * Assumes the caller has verified that the headers are in the pulled up mblk.
998 998 * Consumes mp.
999 999 */
1000 1000 /* ARGSUSED */
1001 1001 static void
1002 1002 icmp_redirect_v6(mblk_t *mp, ip6_t *ip6h, nd_redirect_t *rd,
1003 1003 ip_recv_attr_t *ira)
1004 1004 {
1005 1005 ire_t *ire, *nire;
1006 1006 ire_t *prev_ire = NULL;
1007 1007 ire_t *redir_ire;
1008 1008 in6_addr_t *src, *dst, *gateway;
1009 1009 nd_opt_hdr_t *opt;
1010 1010 nce_t *nce;
1011 1011 int ncec_flags = 0;
1012 1012 int err = 0;
1013 1013 boolean_t redirect_to_router = B_FALSE;
1014 1014 int len;
1015 1015 int optlen;
1016 1016 ill_t *ill = ira->ira_rill;
1017 1017 ill_t *rill = ira->ira_rill;
1018 1018 ip_stack_t *ipst = ill->ill_ipst;
1019 1019
1020 1020 /*
1021 1021 * Since ira_ill is where the IRE_LOCAL was hosted we use ira_rill
1022 1022 * and make it be the IPMP upper so avoid being confused by a packet
1023 1023 * addressed to a unicast address on a different ill.
1024 1024 */
1025 1025 if (IS_UNDER_IPMP(rill)) {
1026 1026 rill = ipmp_ill_hold_ipmp_ill(rill);
1027 1027 if (rill == NULL) {
1028 1028 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInBadRedirects);
1029 1029 ip_drop_input("ipv6IfIcmpInBadRedirects - IPMP ill",
1030 1030 mp, ill);
1031 1031 freemsg(mp);
1032 1032 return;
1033 1033 }
1034 1034 ASSERT(rill != ira->ira_rill);
1035 1035 }
1036 1036
1037 1037 len = mp->b_wptr - (uchar_t *)rd;
1038 1038 src = &ip6h->ip6_src;
1039 1039 dst = &rd->nd_rd_dst;
1040 1040 gateway = &rd->nd_rd_target;
1041 1041
1042 1042 /* Verify if it is a valid redirect */
1043 1043 if (!IN6_IS_ADDR_LINKLOCAL(src) ||
1044 1044 (ip6h->ip6_hops != IPV6_MAX_HOPS) ||
1045 1045 (rd->nd_rd_code != 0) ||
1046 1046 (len < sizeof (nd_redirect_t)) ||
1047 1047 (IN6_IS_ADDR_V4MAPPED(dst)) ||
1048 1048 (IN6_IS_ADDR_MULTICAST(dst))) {
1049 1049 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInBadRedirects);
1050 1050 ip_drop_input("ipv6IfIcmpInBadRedirects - addr/len", mp, ill);
1051 1051 goto fail_redirect;
1052 1052 }
1053 1053
1054 1054 if (!(IN6_IS_ADDR_LINKLOCAL(gateway) ||
1055 1055 IN6_ARE_ADDR_EQUAL(gateway, dst))) {
1056 1056 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInBadRedirects);
1057 1057 ip_drop_input("ipv6IfIcmpInBadRedirects - bad gateway",
1058 1058 mp, ill);
1059 1059 goto fail_redirect;
1060 1060 }
1061 1061
1062 1062 optlen = len - sizeof (nd_redirect_t);
1063 1063 if (optlen != 0) {
1064 1064 if (!ndp_verify_optlen((nd_opt_hdr_t *)&rd[1], optlen)) {
1065 1065 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInBadRedirects);
1066 1066 ip_drop_input("ipv6IfIcmpInBadRedirects - options",
1067 1067 mp, ill);
1068 1068 goto fail_redirect;
1069 1069 }
1070 1070 }
1071 1071
1072 1072 if (!IN6_ARE_ADDR_EQUAL(gateway, dst)) {
1073 1073 redirect_to_router = B_TRUE;
1074 1074 ncec_flags |= NCE_F_ISROUTER;
1075 1075 } else {
1076 1076 gateway = dst; /* Add nce for dst */
1077 1077 }
1078 1078
1079 1079
1080 1080 /*
1081 1081 * Verify that the IP source address of the redirect is
1082 1082 * the same as the current first-hop router for the specified
1083 1083 * ICMP destination address.
1084 1084 * Also, Make sure we had a route for the dest in question and
1085 1085 * that route was pointing to the old gateway (the source of the
1086 1086 * redirect packet.)
1087 1087 * We do longest match and then compare ire_gateway_addr_v6 below.
1088 1088 */
1089 1089 prev_ire = ire_ftable_lookup_v6(dst, 0, 0, 0, rill,
1090 1090 ALL_ZONES, NULL, MATCH_IRE_ILL, 0, ipst, NULL);
1091 1091
1092 1092 /*
1093 1093 * Check that
1094 1094 * the redirect was not from ourselves
1095 1095 * old gateway is still directly reachable
1096 1096 */
1097 1097 if (prev_ire == NULL ||
1098 1098 (prev_ire->ire_type & (IRE_LOCAL|IRE_LOOPBACK)) ||
1099 1099 (prev_ire->ire_flags & (RTF_REJECT|RTF_BLACKHOLE)) ||
1100 1100 !IN6_ARE_ADDR_EQUAL(src, &prev_ire->ire_gateway_addr_v6)) {
1101 1101 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInBadRedirects);
1102 1102 ip_drop_input("ipv6IfIcmpInBadRedirects - ire", mp, ill);
1103 1103 goto fail_redirect;
1104 1104 }
1105 1105
1106 1106 ASSERT(prev_ire->ire_ill != NULL);
1107 1107 if (prev_ire->ire_ill->ill_flags & ILLF_NONUD)
1108 1108 ncec_flags |= NCE_F_NONUD;
1109 1109
1110 1110 opt = (nd_opt_hdr_t *)&rd[1];
1111 1111 opt = ndp_get_option(opt, optlen, ND_OPT_TARGET_LINKADDR);
1112 1112 if (opt != NULL) {
1113 1113 err = nce_lookup_then_add_v6(rill,
1114 1114 (uchar_t *)&opt[1], /* Link layer address */
1115 1115 rill->ill_phys_addr_length,
1116 1116 gateway, ncec_flags, ND_STALE, &nce);
1117 1117 switch (err) {
1118 1118 case 0:
1119 1119 nce_refrele(nce);
1120 1120 break;
1121 1121 case EEXIST:
1122 1122 /*
1123 1123 * Check to see if link layer address has changed and
1124 1124 * process the ncec_state accordingly.
1125 1125 */
1126 1126 nce_process(nce->nce_common,
1127 1127 (uchar_t *)&opt[1], 0, B_FALSE);
1128 1128 nce_refrele(nce);
1129 1129 break;
1130 1130 default:
1131 1131 ip1dbg(("icmp_redirect_v6: NCE create failed %d\n",
1132 1132 err));
1133 1133 goto fail_redirect;
1134 1134 }
1135 1135 }
1136 1136 if (redirect_to_router) {
1137 1137 ASSERT(IN6_IS_ADDR_LINKLOCAL(gateway));
1138 1138
1139 1139 /*
1140 1140 * Create a Route Association. This will allow us to remember
1141 1141 * a router told us to use the particular gateway.
1142 1142 */
1143 1143 ire = ire_create_v6(
1144 1144 dst,
1145 1145 &ipv6_all_ones, /* mask */
1146 1146 gateway, /* gateway addr */
1147 1147 IRE_HOST,
1148 1148 prev_ire->ire_ill,
1149 1149 ALL_ZONES,
1150 1150 (RTF_DYNAMIC | RTF_GATEWAY | RTF_HOST),
1151 1151 NULL,
1152 1152 ipst);
1153 1153 } else {
1154 1154 ipif_t *ipif;
1155 1155 in6_addr_t gw;
1156 1156
1157 1157 /*
1158 1158 * Just create an on link entry, i.e. interface route.
1159 1159 * The gateway field is our link-local on the ill.
1160 1160 */
1161 1161 mutex_enter(&rill->ill_lock);
1162 1162 for (ipif = rill->ill_ipif; ipif != NULL;
1163 1163 ipif = ipif->ipif_next) {
1164 1164 if (!(ipif->ipif_state_flags & IPIF_CONDEMNED) &&
1165 1165 IN6_IS_ADDR_LINKLOCAL(&ipif->ipif_v6lcl_addr))
1166 1166 break;
1167 1167 }
1168 1168 if (ipif == NULL) {
1169 1169 /* We have no link-local address! */
1170 1170 mutex_exit(&rill->ill_lock);
1171 1171 goto fail_redirect;
1172 1172 }
1173 1173 gw = ipif->ipif_v6lcl_addr;
1174 1174 mutex_exit(&rill->ill_lock);
1175 1175
1176 1176 ire = ire_create_v6(
1177 1177 dst, /* gateway == dst */
1178 1178 &ipv6_all_ones, /* mask */
1179 1179 &gw, /* gateway addr */
1180 1180 rill->ill_net_type, /* IF_[NO]RESOLVER */
1181 1181 prev_ire->ire_ill,
1182 1182 ALL_ZONES,
1183 1183 (RTF_DYNAMIC | RTF_HOST),
1184 1184 NULL,
1185 1185 ipst);
1186 1186 }
1187 1187
1188 1188 if (ire == NULL)
1189 1189 goto fail_redirect;
1190 1190
1191 1191 nire = ire_add(ire);
1192 1192 /* Check if it was a duplicate entry */
1193 1193 if (nire != NULL && nire != ire) {
1194 1194 ASSERT(nire->ire_identical_ref > 1);
1195 1195 ire_delete(nire);
1196 1196 ire_refrele(nire);
1197 1197 nire = NULL;
1198 1198 }
1199 1199 ire = nire;
1200 1200 if (ire != NULL) {
1201 1201 ire_refrele(ire); /* Held in ire_add */
1202 1202
1203 1203 /* tell routing sockets that we received a redirect */
1204 1204 ip_rts_change_v6(RTM_REDIRECT,
1205 1205 &rd->nd_rd_dst,
1206 1206 &rd->nd_rd_target,
1207 1207 &ipv6_all_ones, 0, src,
1208 1208 (RTF_DYNAMIC | RTF_GATEWAY | RTF_HOST), 0,
1209 1209 (RTA_DST | RTA_GATEWAY | RTA_NETMASK | RTA_AUTHOR), ipst);
1210 1210
1211 1211 /*
1212 1212 * Delete any existing IRE_HOST type ires for this destination.
1213 1213 * This together with the added IRE has the effect of
1214 1214 * modifying an existing redirect.
1215 1215 */
1216 1216 redir_ire = ire_ftable_lookup_v6(dst, 0, src, IRE_HOST,
1217 1217 prev_ire->ire_ill, ALL_ZONES, NULL,
1218 1218 (MATCH_IRE_GW | MATCH_IRE_TYPE | MATCH_IRE_ILL), 0, ipst,
1219 1219 NULL);
1220 1220
1221 1221 if (redir_ire != NULL) {
1222 1222 if (redir_ire->ire_flags & RTF_DYNAMIC)
1223 1223 ire_delete(redir_ire);
1224 1224 ire_refrele(redir_ire);
1225 1225 }
1226 1226 }
1227 1227
1228 1228 ire_refrele(prev_ire);
1229 1229 prev_ire = NULL;
1230 1230
1231 1231 fail_redirect:
1232 1232 if (prev_ire != NULL)
1233 1233 ire_refrele(prev_ire);
1234 1234 freemsg(mp);
1235 1235 if (rill != ira->ira_rill)
1236 1236 ill_refrele(rill);
1237 1237 }
1238 1238
1239 1239 /*
1240 1240 * Build and ship an IPv6 ICMP message using the packet data in mp,
1241 1241 * and the ICMP header pointed to by "stuff". (May be called as
1242 1242 * writer.)
1243 1243 * Note: assumes that icmp_pkt_err_ok_v6 has been called to
1244 1244 * verify that an icmp error packet can be sent.
1245 1245 *
1246 1246 * If v6src_ptr is set use it as a source. Otherwise select a reasonable
1247 1247 * source address (see above function).
1248 1248 */
1249 1249 static void
1250 1250 icmp_pkt_v6(mblk_t *mp, void *stuff, size_t len,
1251 1251 const in6_addr_t *v6src_ptr, ip_recv_attr_t *ira)
1252 1252 {
1253 1253 ip6_t *ip6h;
1254 1254 in6_addr_t v6dst;
1255 1255 size_t len_needed;
1256 1256 size_t msg_len;
1257 1257 mblk_t *mp1;
1258 1258 icmp6_t *icmp6;
1259 1259 in6_addr_t v6src;
1260 1260 ill_t *ill = ira->ira_ill;
1261 1261 ip_stack_t *ipst = ill->ill_ipst;
1262 1262 ip_xmit_attr_t ixas;
1263 1263
1264 1264 ip6h = (ip6_t *)mp->b_rptr;
1265 1265
1266 1266 bzero(&ixas, sizeof (ixas));
1267 1267 ixas.ixa_flags = IXAF_BASIC_SIMPLE_V6;
1268 1268 ixas.ixa_zoneid = ira->ira_zoneid;
1269 1269 ixas.ixa_ifindex = 0;
1270 1270 ixas.ixa_ipst = ipst;
1271 1271 ixas.ixa_cred = kcred;
1272 1272 ixas.ixa_cpid = NOPID;
1273 1273 ixas.ixa_tsl = ira->ira_tsl; /* Behave as a multi-level responder */
1274 1274 ixas.ixa_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
1275 1275
1276 1276 /*
1277 1277 * If the source of the original packet was link-local, then
1278 1278 * make sure we send on the same ill (group) as we received it on.
1279 1279 */
1280 1280 if (IN6_IS_ADDR_LINKSCOPE(&ip6h->ip6_src)) {
1281 1281 ixas.ixa_flags |= IXAF_SCOPEID_SET;
1282 1282 if (IS_UNDER_IPMP(ill))
1283 1283 ixas.ixa_scopeid = ill_get_upper_ifindex(ill);
1284 1284 else
1285 1285 ixas.ixa_scopeid = ill->ill_phyint->phyint_ifindex;
1286 1286 }
1287 1287
1288 1288 if (ira->ira_flags & IRAF_IPSEC_SECURE) {
1289 1289 /*
1290 1290 * Apply IPsec based on how IPsec was applied to
1291 1291 * the packet that had the error.
1292 1292 *
1293 1293 * If it was an outbound packet that caused the ICMP
1294 1294 * error, then the caller will have setup the IRA
1295 1295 * appropriately.
1296 1296 */
1297 1297 if (!ipsec_in_to_out(ira, &ixas, mp, NULL, ip6h)) {
1298 1298 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards);
1299 1299 /* Note: mp already consumed and ip_drop_packet done */
1300 1300 return;
1301 1301 }
1302 1302 } else {
1303 1303 /*
1304 1304 * This is in clear. The icmp message we are building
1305 1305 * here should go out in clear, independent of our policy.
1306 1306 */
1307 1307 ixas.ixa_flags |= IXAF_NO_IPSEC;
1308 1308 }
1309 1309
1310 1310 /*
1311 1311 * If the caller specified the source we use that.
1312 1312 * Otherwise, if the packet was for one of our unicast addresses, make
1313 1313 * sure we respond with that as the source. Otherwise
1314 1314 * have ip_output_simple pick the source address.
1315 1315 */
1316 1316 if (v6src_ptr != NULL) {
1317 1317 v6src = *v6src_ptr;
1318 1318 } else {
1319 1319 ire_t *ire;
1320 1320 uint_t match_flags = MATCH_IRE_TYPE | MATCH_IRE_ZONEONLY;
1321 1321
1322 1322 if (IN6_IS_ADDR_LINKLOCAL(&ip6h->ip6_src) ||
1323 1323 IN6_IS_ADDR_LINKLOCAL(&ip6h->ip6_dst))
1324 1324 match_flags |= MATCH_IRE_ILL;
1325 1325
1326 1326 ire = ire_ftable_lookup_v6(&ip6h->ip6_dst, 0, 0,
1327 1327 (IRE_LOCAL|IRE_LOOPBACK), ill, ira->ira_zoneid, NULL,
1328 1328 match_flags, 0, ipst, NULL);
1329 1329 if (ire != NULL) {
1330 1330 v6src = ip6h->ip6_dst;
1331 1331 ire_refrele(ire);
1332 1332 } else {
1333 1333 v6src = ipv6_all_zeros;
1334 1334 ixas.ixa_flags |= IXAF_SET_SOURCE;
1335 1335 }
1336 1336 }
1337 1337 v6dst = ip6h->ip6_src;
1338 1338 len_needed = ipst->ips_ipv6_icmp_return - IPV6_HDR_LEN - len;
1339 1339 msg_len = msgdsize(mp);
1340 1340 if (msg_len > len_needed) {
1341 1341 if (!adjmsg(mp, len_needed - msg_len)) {
1342 1342 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutErrors);
1343 1343 freemsg(mp);
1344 1344 return;
1345 1345 }
1346 1346 msg_len = len_needed;
1347 1347 }
1348 1348 mp1 = allocb(IPV6_HDR_LEN + len, BPRI_MED);
1349 1349 if (mp1 == NULL) {
1350 1350 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutErrors);
1351 1351 freemsg(mp);
1352 1352 return;
1353 1353 }
1354 1354 mp1->b_cont = mp;
1355 1355 mp = mp1;
1356 1356
1357 1357 /*
1358 1358 * Set IXAF_TRUSTED_ICMP so we can let the ICMP messages this
1359 1359 * node generates be accepted in peace by all on-host destinations.
1360 1360 * If we do NOT assume that all on-host destinations trust
1361 1361 * self-generated ICMP messages, then rework here, ip6.c, and spd.c.
1362 1362 * (Look for IXAF_TRUSTED_ICMP).
1363 1363 */
1364 1364 ixas.ixa_flags |= IXAF_TRUSTED_ICMP;
1365 1365
1366 1366 ip6h = (ip6_t *)mp->b_rptr;
1367 1367 mp1->b_wptr = (uchar_t *)ip6h + (IPV6_HDR_LEN + len);
1368 1368
1369 1369 ip6h->ip6_vcf = IPV6_DEFAULT_VERS_AND_FLOW;
1370 1370 ip6h->ip6_nxt = IPPROTO_ICMPV6;
1371 1371 ip6h->ip6_hops = ipst->ips_ipv6_def_hops;
1372 1372 ip6h->ip6_dst = v6dst;
1373 1373 ip6h->ip6_src = v6src;
1374 1374 msg_len += IPV6_HDR_LEN + len;
1375 1375 if (msg_len > IP_MAXPACKET + IPV6_HDR_LEN) {
1376 1376 (void) adjmsg(mp, IP_MAXPACKET + IPV6_HDR_LEN - msg_len);
1377 1377 msg_len = IP_MAXPACKET + IPV6_HDR_LEN;
1378 1378 }
1379 1379 ip6h->ip6_plen = htons((uint16_t)(msgdsize(mp) - IPV6_HDR_LEN));
1380 1380 icmp6 = (icmp6_t *)&ip6h[1];
1381 1381 bcopy(stuff, (char *)icmp6, len);
1382 1382 /*
1383 1383 * Prepare for checksum by putting icmp length in the icmp
1384 1384 * checksum field. The checksum is calculated in ip_output_wire_v6.
1385 1385 */
1386 1386 icmp6->icmp6_cksum = ip6h->ip6_plen;
1387 1387 if (icmp6->icmp6_type == ND_REDIRECT) {
1388 1388 ip6h->ip6_hops = IPV6_MAX_HOPS;
1389 1389 }
1390 1390
1391 1391 (void) ip_output_simple(mp, &ixas);
1392 1392 ixa_cleanup(&ixas);
1393 1393 }
1394 1394
1395 1395 /*
1396 1396 * Update the output mib when ICMPv6 packets are sent.
1397 1397 */
1398 1398 void
1399 1399 icmp_update_out_mib_v6(ill_t *ill, icmp6_t *icmp6)
1400 1400 {
1401 1401 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutMsgs);
1402 1402
1403 1403 switch (icmp6->icmp6_type) {
1404 1404 case ICMP6_DST_UNREACH:
1405 1405 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutDestUnreachs);
1406 1406 if (icmp6->icmp6_code == ICMP6_DST_UNREACH_ADMIN)
1407 1407 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutAdminProhibs);
1408 1408 break;
1409 1409
1410 1410 case ICMP6_TIME_EXCEEDED:
1411 1411 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutTimeExcds);
1412 1412 break;
1413 1413
1414 1414 case ICMP6_PARAM_PROB:
1415 1415 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutParmProblems);
1416 1416 break;
1417 1417
1418 1418 case ICMP6_PACKET_TOO_BIG:
1419 1419 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutPktTooBigs);
1420 1420 break;
1421 1421
1422 1422 case ICMP6_ECHO_REQUEST:
1423 1423 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutEchos);
1424 1424 break;
1425 1425
1426 1426 case ICMP6_ECHO_REPLY:
1427 1427 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutEchoReplies);
1428 1428 break;
1429 1429
1430 1430 case ND_ROUTER_SOLICIT:
1431 1431 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutRouterSolicits);
1432 1432 break;
1433 1433
1434 1434 case ND_ROUTER_ADVERT:
1435 1435 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutRouterAdvertisements);
1436 1436 break;
1437 1437
1438 1438 case ND_NEIGHBOR_SOLICIT:
1439 1439 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutNeighborSolicits);
1440 1440 break;
1441 1441
1442 1442 case ND_NEIGHBOR_ADVERT:
1443 1443 BUMP_MIB(ill->ill_icmp6_mib,
1444 1444 ipv6IfIcmpOutNeighborAdvertisements);
1445 1445 break;
1446 1446
1447 1447 case ND_REDIRECT:
1448 1448 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutRedirects);
1449 1449 break;
1450 1450
1451 1451 case MLD_LISTENER_QUERY:
1452 1452 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutGroupMembQueries);
1453 1453 break;
1454 1454
1455 1455 case MLD_LISTENER_REPORT:
1456 1456 case MLD_V2_LISTENER_REPORT:
1457 1457 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutGroupMembResponses);
1458 1458 break;
1459 1459
1460 1460 case MLD_LISTENER_REDUCTION:
1461 1461 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutGroupMembReductions);
1462 1462 break;
1463 1463 }
1464 1464 }
1465 1465
1466 1466 /*
1467 1467 * Check if it is ok to send an ICMPv6 error packet in
1468 1468 * response to the IP packet in mp.
1469 1469 * Free the message and return null if no
1470 1470 * ICMP error packet should be sent.
1471 1471 */
1472 1472 static mblk_t *
1473 1473 icmp_pkt_err_ok_v6(mblk_t *mp, boolean_t mcast_ok, ip_recv_attr_t *ira)
1474 1474 {
1475 1475 ill_t *ill = ira->ira_ill;
1476 1476 ip_stack_t *ipst = ill->ill_ipst;
1477 1477 boolean_t llbcast;
1478 1478 ip6_t *ip6h;
1479 1479
1480 1480 if (!mp)
1481 1481 return (NULL);
1482 1482
1483 1483 /* We view multicast and broadcast as the same.. */
1484 1484 llbcast = (ira->ira_flags &
1485 1485 (IRAF_L2DST_MULTICAST|IRAF_L2DST_BROADCAST)) != 0;
1486 1486 ip6h = (ip6_t *)mp->b_rptr;
1487 1487
1488 1488 /* Check if source address uniquely identifies the host */
1489 1489
1490 1490 if (IN6_IS_ADDR_MULTICAST(&ip6h->ip6_src) ||
1491 1491 IN6_IS_ADDR_V4MAPPED(&ip6h->ip6_src) ||
1492 1492 IN6_IS_ADDR_UNSPECIFIED(&ip6h->ip6_src)) {
1493 1493 freemsg(mp);
1494 1494 return (NULL);
1495 1495 }
1496 1496
1497 1497 if (ip6h->ip6_nxt == IPPROTO_ICMPV6) {
1498 1498 size_t len_needed = IPV6_HDR_LEN + ICMP6_MINLEN;
1499 1499 icmp6_t *icmp6;
1500 1500
1501 1501 if (mp->b_wptr - mp->b_rptr < len_needed) {
1502 1502 if (!pullupmsg(mp, len_needed)) {
1503 1503 BUMP_MIB(ill->ill_icmp6_mib,
1504 1504 ipv6IfIcmpInErrors);
1505 1505 freemsg(mp);
1506 1506 return (NULL);
1507 1507 }
1508 1508 ip6h = (ip6_t *)mp->b_rptr;
1509 1509 }
1510 1510 icmp6 = (icmp6_t *)&ip6h[1];
1511 1511 /* Explicitly do not generate errors in response to redirects */
1512 1512 if (ICMP6_IS_ERROR(icmp6->icmp6_type) ||
1513 1513 icmp6->icmp6_type == ND_REDIRECT) {
1514 1514 freemsg(mp);
1515 1515 return (NULL);
1516 1516 }
1517 1517 }
1518 1518 /*
1519 1519 * Check that the destination is not multicast and that the packet
1520 1520 * was not sent on link layer broadcast or multicast. (Exception
1521 1521 * is Packet too big message as per the draft - when mcast_ok is set.)
1522 1522 */
1523 1523 if (!mcast_ok &&
1524 1524 (llbcast || IN6_IS_ADDR_MULTICAST(&ip6h->ip6_dst))) {
1525 1525 freemsg(mp);
1526 1526 return (NULL);
1527 1527 }
1528 1528 /*
1529 1529 * If this is a labeled system, then check to see if we're allowed to
1530 1530 * send a response to this particular sender. If not, then just drop.
1531 1531 */
1532 1532 if (is_system_labeled() && !tsol_can_reply_error(mp, ira)) {
1533 1533 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpOutErrors);
1534 1534 freemsg(mp);
1535 1535 return (NULL);
1536 1536 }
1537 1537
1538 1538 if (icmp_err_rate_limit(ipst)) {
1539 1539 /*
1540 1540 * Only send ICMP error packets every so often.
1541 1541 * This should be done on a per port/source basis,
1542 1542 * but for now this will suffice.
1543 1543 */
1544 1544 freemsg(mp);
1545 1545 return (NULL);
1546 1546 }
1547 1547 return (mp);
1548 1548 }
1549 1549
1550 1550 /*
1551 1551 * Called when a packet was sent out the same link that it arrived on.
1552 1552 * Check if it is ok to send a redirect and then send it.
1553 1553 */
1554 1554 void
1555 1555 ip_send_potential_redirect_v6(mblk_t *mp, ip6_t *ip6h, ire_t *ire,
1556 1556 ip_recv_attr_t *ira)
1557 1557 {
1558 1558 ill_t *ill = ira->ira_ill;
1559 1559 ip_stack_t *ipst = ill->ill_ipst;
1560 1560 in6_addr_t *v6targ;
1561 1561 ire_t *src_ire_v6 = NULL;
1562 1562 mblk_t *mp1;
1563 1563 ire_t *nhop_ire = NULL;
1564 1564
1565 1565 /*
1566 1566 * Don't send a redirect when forwarding a source
1567 1567 * routed packet.
1568 1568 */
1569 1569 if (ip_source_routed_v6(ip6h, mp, ipst))
1570 1570 return;
1571 1571
1572 1572 if (ire->ire_type & IRE_ONLINK) {
1573 1573 /* Target is directly connected */
1574 1574 v6targ = &ip6h->ip6_dst;
1575 1575 } else {
1576 1576 /* Determine the most specific IRE used to send the packets */
1577 1577 nhop_ire = ire_nexthop(ire);
1578 1578 if (nhop_ire == NULL)
1579 1579 return;
1580 1580
1581 1581 /*
1582 1582 * We won't send redirects to a router
1583 1583 * that doesn't have a link local
1584 1584 * address, but will forward.
1585 1585 */
1586 1586 if (!IN6_IS_ADDR_LINKLOCAL(&nhop_ire->ire_addr_v6)) {
1587 1587 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInAddrErrors);
1588 1588 ip_drop_input("ipIfStatsInAddrErrors", mp, ill);
1589 1589 ire_refrele(nhop_ire);
1590 1590 return;
1591 1591 }
1592 1592 v6targ = &nhop_ire->ire_addr_v6;
1593 1593 }
1594 1594 src_ire_v6 = ire_ftable_lookup_v6(&ip6h->ip6_src,
1595 1595 NULL, NULL, IRE_INTERFACE, ire->ire_ill, ALL_ZONES, NULL,
1596 1596 MATCH_IRE_ILL | MATCH_IRE_TYPE, 0, ipst, NULL);
1597 1597
1598 1598 if (src_ire_v6 == NULL) {
1599 1599 if (nhop_ire != NULL)
1600 1600 ire_refrele(nhop_ire);
1601 1601 return;
1602 1602 }
1603 1603
1604 1604 /*
1605 1605 * The source is directly connected.
1606 1606 */
1607 1607 mp1 = copymsg(mp);
1608 1608 if (mp1 != NULL)
1609 1609 icmp_send_redirect_v6(mp1, v6targ, &ip6h->ip6_dst, ira);
1610 1610
1611 1611 if (nhop_ire != NULL)
1612 1612 ire_refrele(nhop_ire);
1613 1613 ire_refrele(src_ire_v6);
1614 1614 }
1615 1615
1616 1616 /*
1617 1617 * Generate an ICMPv6 redirect message.
1618 1618 * Include target link layer address option if it exits.
1619 1619 * Always include redirect header.
1620 1620 */
1621 1621 static void
1622 1622 icmp_send_redirect_v6(mblk_t *mp, in6_addr_t *targetp, in6_addr_t *dest,
1623 1623 ip_recv_attr_t *ira)
1624 1624 {
1625 1625 nd_redirect_t *rd;
1626 1626 nd_opt_rd_hdr_t *rdh;
1627 1627 uchar_t *buf;
1628 1628 ncec_t *ncec = NULL;
1629 1629 nd_opt_hdr_t *opt;
1630 1630 int len;
1631 1631 int ll_opt_len = 0;
1632 1632 int max_redir_hdr_data_len;
1633 1633 int pkt_len;
1634 1634 in6_addr_t *srcp;
1635 1635 ill_t *ill;
1636 1636 boolean_t need_refrele;
1637 1637 ip_stack_t *ipst = ira->ira_ill->ill_ipst;
1638 1638
1639 1639 mp = icmp_pkt_err_ok_v6(mp, B_FALSE, ira);
1640 1640 if (mp == NULL)
1641 1641 return;
1642 1642
1643 1643 if (IS_UNDER_IPMP(ira->ira_ill)) {
1644 1644 ill = ipmp_ill_hold_ipmp_ill(ira->ira_ill);
1645 1645 if (ill == NULL) {
1646 1646 ill = ira->ira_ill;
1647 1647 BUMP_MIB(ill->ill_icmp6_mib, ipv6IfIcmpInBadRedirects);
1648 1648 ip_drop_output("no IPMP ill for sending redirect",
1649 1649 mp, ill);
1650 1650 freemsg(mp);
1651 1651 return;
1652 1652 }
1653 1653 need_refrele = B_TRUE;
1654 1654 } else {
1655 1655 ill = ira->ira_ill;
1656 1656 need_refrele = B_FALSE;
1657 1657 }
1658 1658
1659 1659 ncec = ncec_lookup_illgrp_v6(ill, targetp);
1660 1660 if (ncec != NULL && ncec->ncec_state != ND_INCOMPLETE &&
1661 1661 ncec->ncec_lladdr != NULL) {
1662 1662 ll_opt_len = (sizeof (nd_opt_hdr_t) +
1663 1663 ill->ill_phys_addr_length + 7)/8 * 8;
1664 1664 }
1665 1665 len = sizeof (nd_redirect_t) + sizeof (nd_opt_rd_hdr_t) + ll_opt_len;
1666 1666 ASSERT(len % 4 == 0);
1667 1667 buf = kmem_alloc(len, KM_NOSLEEP);
1668 1668 if (buf == NULL) {
1669 1669 if (ncec != NULL)
1670 1670 ncec_refrele(ncec);
1671 1671 if (need_refrele)
1672 1672 ill_refrele(ill);
1673 1673 freemsg(mp);
1674 1674 return;
1675 1675 }
1676 1676
1677 1677 rd = (nd_redirect_t *)buf;
1678 1678 rd->nd_rd_type = (uint8_t)ND_REDIRECT;
1679 1679 rd->nd_rd_code = 0;
1680 1680 rd->nd_rd_reserved = 0;
1681 1681 rd->nd_rd_target = *targetp;
1682 1682 rd->nd_rd_dst = *dest;
1683 1683
1684 1684 opt = (nd_opt_hdr_t *)(buf + sizeof (nd_redirect_t));
1685 1685 if (ncec != NULL && ll_opt_len != 0) {
1686 1686 opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1687 1687 opt->nd_opt_len = ll_opt_len/8;
1688 1688 bcopy((char *)ncec->ncec_lladdr, &opt[1],
1689 1689 ill->ill_phys_addr_length);
1690 1690 }
1691 1691 if (ncec != NULL)
1692 1692 ncec_refrele(ncec);
1693 1693 rdh = (nd_opt_rd_hdr_t *)(buf + sizeof (nd_redirect_t) + ll_opt_len);
1694 1694 rdh->nd_opt_rh_type = (uint8_t)ND_OPT_REDIRECTED_HEADER;
1695 1695 /* max_redir_hdr_data_len and nd_opt_rh_len must be multiple of 8 */
1696 1696 max_redir_hdr_data_len =
1697 1697 (ipst->ips_ipv6_icmp_return - IPV6_HDR_LEN - len)/8*8;
1698 1698 pkt_len = msgdsize(mp);
1699 1699 /* Make sure mp is 8 byte aligned */
1700 1700 if (pkt_len > max_redir_hdr_data_len) {
1701 1701 rdh->nd_opt_rh_len = (max_redir_hdr_data_len +
1702 1702 sizeof (nd_opt_rd_hdr_t))/8;
1703 1703 (void) adjmsg(mp, max_redir_hdr_data_len - pkt_len);
1704 1704 } else {
1705 1705 rdh->nd_opt_rh_len = (pkt_len + sizeof (nd_opt_rd_hdr_t))/8;
1706 1706 (void) adjmsg(mp, -(pkt_len % 8));
1707 1707 }
1708 1708 rdh->nd_opt_rh_reserved1 = 0;
1709 1709 rdh->nd_opt_rh_reserved2 = 0;
1710 1710 /* ipif_v6lcl_addr contains the link-local source address */
1711 1711 srcp = &ill->ill_ipif->ipif_v6lcl_addr;
1712 1712
1713 1713 /* Redirects sent by router, and router is global zone */
1714 1714 ASSERT(ira->ira_zoneid == ALL_ZONES);
1715 1715 ira->ira_zoneid = GLOBAL_ZONEID;
1716 1716 icmp_pkt_v6(mp, buf, len, srcp, ira);
1717 1717 kmem_free(buf, len);
1718 1718 if (need_refrele)
1719 1719 ill_refrele(ill);
1720 1720 }
1721 1721
1722 1722
1723 1723 /* Generate an ICMP time exceeded message. (May be called as writer.) */
1724 1724 void
1725 1725 icmp_time_exceeded_v6(mblk_t *mp, uint8_t code, boolean_t mcast_ok,
1726 1726 ip_recv_attr_t *ira)
1727 1727 {
1728 1728 icmp6_t icmp6;
1729 1729
1730 1730 mp = icmp_pkt_err_ok_v6(mp, mcast_ok, ira);
1731 1731 if (mp == NULL)
1732 1732 return;
1733 1733
1734 1734 bzero(&icmp6, sizeof (icmp6_t));
1735 1735 icmp6.icmp6_type = ICMP6_TIME_EXCEEDED;
1736 1736 icmp6.icmp6_code = code;
1737 1737 icmp_pkt_v6(mp, &icmp6, sizeof (icmp6_t), NULL, ira);
1738 1738 }
1739 1739
1740 1740 /*
1741 1741 * Generate an ICMP unreachable message.
1742 1742 * When called from ip_output side a minimal ip_recv_attr_t needs to be
1743 1743 * constructed by the caller.
1744 1744 */
1745 1745 void
1746 1746 icmp_unreachable_v6(mblk_t *mp, uint8_t code, boolean_t mcast_ok,
1747 1747 ip_recv_attr_t *ira)
1748 1748 {
1749 1749 icmp6_t icmp6;
1750 1750
1751 1751 mp = icmp_pkt_err_ok_v6(mp, mcast_ok, ira);
1752 1752 if (mp == NULL)
1753 1753 return;
1754 1754
1755 1755 bzero(&icmp6, sizeof (icmp6_t));
1756 1756 icmp6.icmp6_type = ICMP6_DST_UNREACH;
1757 1757 icmp6.icmp6_code = code;
1758 1758 icmp_pkt_v6(mp, &icmp6, sizeof (icmp6_t), NULL, ira);
1759 1759 }
1760 1760
1761 1761 /*
1762 1762 * Generate an ICMP pkt too big message.
1763 1763 * When called from ip_output side a minimal ip_recv_attr_t needs to be
1764 1764 * constructed by the caller.
1765 1765 */
1766 1766 void
1767 1767 icmp_pkt2big_v6(mblk_t *mp, uint32_t mtu, boolean_t mcast_ok,
1768 1768 ip_recv_attr_t *ira)
1769 1769 {
1770 1770 icmp6_t icmp6;
1771 1771
1772 1772 mp = icmp_pkt_err_ok_v6(mp, mcast_ok, ira);
1773 1773 if (mp == NULL)
1774 1774 return;
1775 1775
1776 1776 bzero(&icmp6, sizeof (icmp6_t));
1777 1777 icmp6.icmp6_type = ICMP6_PACKET_TOO_BIG;
1778 1778 icmp6.icmp6_code = 0;
1779 1779 icmp6.icmp6_mtu = htonl(mtu);
1780 1780
1781 1781 icmp_pkt_v6(mp, &icmp6, sizeof (icmp6_t), NULL, ira);
1782 1782 }
1783 1783
1784 1784 /*
1785 1785 * Generate an ICMP parameter problem message. (May be called as writer.)
1786 1786 * 'offset' is the offset from the beginning of the packet in error.
1787 1787 * When called from ip_output side a minimal ip_recv_attr_t needs to be
1788 1788 * constructed by the caller.
1789 1789 */
1790 1790 static void
1791 1791 icmp_param_problem_v6(mblk_t *mp, uint8_t code, uint32_t offset,
1792 1792 boolean_t mcast_ok, ip_recv_attr_t *ira)
1793 1793 {
1794 1794 icmp6_t icmp6;
1795 1795
1796 1796 mp = icmp_pkt_err_ok_v6(mp, mcast_ok, ira);
1797 1797 if (mp == NULL)
1798 1798 return;
1799 1799
1800 1800 bzero((char *)&icmp6, sizeof (icmp6_t));
1801 1801 icmp6.icmp6_type = ICMP6_PARAM_PROB;
1802 1802 icmp6.icmp6_code = code;
1803 1803 icmp6.icmp6_pptr = htonl(offset);
1804 1804 icmp_pkt_v6(mp, &icmp6, sizeof (icmp6_t), NULL, ira);
1805 1805 }
1806 1806
1807 1807 void
1808 1808 icmp_param_problem_nexthdr_v6(mblk_t *mp, boolean_t mcast_ok,
1809 1809 ip_recv_attr_t *ira)
1810 1810 {
1811 1811 ip6_t *ip6h = (ip6_t *)mp->b_rptr;
1812 1812 uint16_t hdr_length;
1813 1813 uint8_t *nexthdrp;
1814 1814 uint32_t offset;
1815 1815 ill_t *ill = ira->ira_ill;
1816 1816
1817 1817 /* Determine the offset of the bad nexthdr value */
1818 1818 if (!ip_hdr_length_nexthdr_v6(mp, ip6h, &hdr_length, &nexthdrp)) {
1819 1819 /* Malformed packet */
1820 1820 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
1821 1821 ip_drop_input("ipIfStatsInDiscards", mp, ill);
1822 1822 freemsg(mp);
1823 1823 return;
1824 1824 }
1825 1825
1826 1826 offset = nexthdrp - mp->b_rptr;
1827 1827 icmp_param_problem_v6(mp, ICMP6_PARAMPROB_NEXTHEADER, offset,
1828 1828 mcast_ok, ira);
1829 1829 }
1830 1830
1831 1831 /*
1832 1832 * Verify whether or not the IP address is a valid local address.
1833 1833 * Could be a unicast, including one for a down interface.
1834 1834 * If allow_mcbc then a multicast or broadcast address is also
1835 1835 * acceptable.
1836 1836 *
1837 1837 * In the case of a multicast address, however, the
1838 1838 * upper protocol is expected to reset the src address
1839 1839 * to zero when we return IPVL_MCAST so that
1840 1840 * no packets are emitted with multicast address as
1841 1841 * source address.
1842 1842 * The addresses valid for bind are:
1843 1843 * (1) - in6addr_any
1844 1844 * (2) - IP address of an UP interface
1845 1845 * (3) - IP address of a DOWN interface
1846 1846 * (4) - a multicast address. In this case
1847 1847 * the conn will only receive packets destined to
1848 1848 * the specified multicast address. Note: the
1849 1849 * application still has to issue an
1850 1850 * IPV6_JOIN_GROUP socket option.
1851 1851 *
1852 1852 * In all the above cases, the bound address must be valid in the current zone.
1853 1853 * When the address is loopback or multicast, there might be many matching IREs
1854 1854 * so bind has to look up based on the zone.
1855 1855 */
1856 1856 ip_laddr_t
1857 1857 ip_laddr_verify_v6(const in6_addr_t *v6src, zoneid_t zoneid,
1858 1858 ip_stack_t *ipst, boolean_t allow_mcbc, uint_t scopeid)
1859 1859 {
1860 1860 ire_t *src_ire;
1861 1861 uint_t match_flags;
1862 1862 ill_t *ill = NULL;
1863 1863
1864 1864 ASSERT(!IN6_IS_ADDR_V4MAPPED(v6src));
1865 1865 ASSERT(!IN6_IS_ADDR_UNSPECIFIED(v6src));
1866 1866
1867 1867 match_flags = MATCH_IRE_ZONEONLY;
1868 1868 if (scopeid != 0) {
1869 1869 ill = ill_lookup_on_ifindex(scopeid, B_TRUE, ipst);
1870 1870 if (ill == NULL)
1871 1871 return (IPVL_BAD);
1872 1872 match_flags |= MATCH_IRE_ILL;
1873 1873 }
1874 1874
1875 1875 src_ire = ire_ftable_lookup_v6(v6src, NULL, NULL, 0,
1876 1876 ill, zoneid, NULL, match_flags, 0, ipst, NULL);
1877 1877 if (ill != NULL)
1878 1878 ill_refrele(ill);
1879 1879
1880 1880 /*
1881 1881 * If an address other than in6addr_any is requested,
1882 1882 * we verify that it is a valid address for bind
1883 1883 * Note: Following code is in if-else-if form for
1884 1884 * readability compared to a condition check.
1885 1885 */
1886 1886 if (src_ire != NULL && (src_ire->ire_type & (IRE_LOCAL|IRE_LOOPBACK))) {
1887 1887 /*
1888 1888 * (2) Bind to address of local UP interface
1889 1889 */
1890 1890 ire_refrele(src_ire);
1891 1891 return (IPVL_UNICAST_UP);
1892 1892 } else if (IN6_IS_ADDR_MULTICAST(v6src)) {
1893 1893 /* (4) bind to multicast address. */
1894 1894 if (src_ire != NULL)
1895 1895 ire_refrele(src_ire);
1896 1896
1897 1897 /*
1898 1898 * Note: caller should take IPV6_MULTICAST_IF
1899 1899 * into account when selecting a real source address.
1900 1900 */
1901 1901 if (allow_mcbc)
1902 1902 return (IPVL_MCAST);
1903 1903 else
1904 1904 return (IPVL_BAD);
1905 1905 } else {
1906 1906 ipif_t *ipif;
1907 1907
1908 1908 /*
1909 1909 * (3) Bind to address of local DOWN interface?
1910 1910 * (ipif_lookup_addr() looks up all interfaces
1911 1911 * but we do not get here for UP interfaces
1912 1912 * - case (2) above)
1913 1913 */
1914 1914 if (src_ire != NULL)
1915 1915 ire_refrele(src_ire);
1916 1916
1917 1917 ipif = ipif_lookup_addr_v6(v6src, NULL, zoneid, ipst);
1918 1918 if (ipif == NULL)
1919 1919 return (IPVL_BAD);
1920 1920
1921 1921 /* Not a useful source? */
1922 1922 if (ipif->ipif_flags & (IPIF_NOLOCAL | IPIF_ANYCAST)) {
1923 1923 ipif_refrele(ipif);
1924 1924 return (IPVL_BAD);
1925 1925 }
1926 1926 ipif_refrele(ipif);
1927 1927 return (IPVL_UNICAST_DOWN);
1928 1928 }
1929 1929 }
1930 1930
1931 1931 /*
1932 1932 * Verify that both the source and destination addresses are valid. If
1933 1933 * IPDF_VERIFY_DST is not set, then the destination address may be unreachable,
1934 1934 * i.e. have no route to it. Protocols like TCP want to verify destination
1935 1935 * reachability, while tunnels do not.
1936 1936 *
1937 1937 * Determine the route, the interface, and (optionally) the source address
1938 1938 * to use to reach a given destination.
1939 1939 * Note that we allow connect to broadcast and multicast addresses when
1940 1940 * IPDF_ALLOW_MCBC is set.
1941 1941 * first_hop and dst_addr are normally the same, but if source routing
1942 1942 * they will differ; in that case the first_hop is what we'll use for the
1943 1943 * routing lookup but the dce and label checks will be done on dst_addr,
1944 1944 *
1945 1945 * If uinfo is set, then we fill in the best available information
1946 1946 * we have for the destination. This is based on (in priority order) any
1947 1947 * metrics and path MTU stored in a dce_t, route metrics, and finally the
1948 1948 * ill_mtu/ill_mc_mtu.
1949 1949 *
1950 1950 * Tsol note: If we have a source route then dst_addr != firsthop. But we
1951 1951 * always do the label check on dst_addr.
1952 1952 *
1953 1953 * Assumes that the caller has set ixa_scopeid for link-local communication.
1954 1954 */
1955 1955 int
1956 1956 ip_set_destination_v6(in6_addr_t *src_addrp, const in6_addr_t *dst_addr,
1957 1957 const in6_addr_t *firsthop, ip_xmit_attr_t *ixa, iulp_t *uinfo,
1958 1958 uint32_t flags, uint_t mac_mode)
1959 1959 {
1960 1960 ire_t *ire;
1961 1961 int error = 0;
1962 1962 in6_addr_t setsrc; /* RTF_SETSRC */
1963 1963 zoneid_t zoneid = ixa->ixa_zoneid; /* Honors SO_ALLZONES */
1964 1964 ip_stack_t *ipst = ixa->ixa_ipst;
1965 1965 dce_t *dce;
1966 1966 uint_t pmtu;
1967 1967 uint_t ifindex;
1968 1968 uint_t generation;
1969 1969 nce_t *nce;
1970 1970 ill_t *ill = NULL;
1971 1971 boolean_t multirt = B_FALSE;
1972 1972
1973 1973 ASSERT(!IN6_IS_ADDR_V4MAPPED(dst_addr));
1974 1974
1975 1975 ASSERT(!(ixa->ixa_flags & IXAF_IS_IPV4));
1976 1976
1977 1977 /*
1978 1978 * We never send to zero; the ULPs map it to the loopback address.
1979 1979 * We can't allow it since we use zero to mean unitialized in some
1980 1980 * places.
1981 1981 */
1982 1982 ASSERT(!IN6_IS_ADDR_UNSPECIFIED(dst_addr));
1983 1983
1984 1984 if (is_system_labeled()) {
1985 1985 ts_label_t *tsl = NULL;
1986 1986
1987 1987 error = tsol_check_dest(ixa->ixa_tsl, dst_addr, IPV6_VERSION,
1988 1988 mac_mode, (flags & IPDF_ZONE_IS_GLOBAL) != 0, &tsl);
1989 1989 if (error != 0)
1990 1990 return (error);
1991 1991 if (tsl != NULL) {
1992 1992 /* Update the label */
1993 1993 ip_xmit_attr_replace_tsl(ixa, tsl);
1994 1994 }
1995 1995 }
1996 1996
1997 1997 setsrc = ipv6_all_zeros;
1998 1998 /*
1999 1999 * Select a route; For IPMP interfaces, we would only select
2000 2000 * a "hidden" route (i.e., going through a specific under_ill)
2001 2001 * if ixa_ifindex has been specified.
2002 2002 */
2003 2003 ire = ip_select_route_v6(firsthop, *src_addrp, ixa, &generation,
2004 2004 &setsrc, &error, &multirt);
2005 2005 ASSERT(ire != NULL); /* IRE_NOROUTE if none found */
2006 2006 if (error != 0)
2007 2007 goto bad_addr;
2008 2008
2009 2009 /*
2010 2010 * ire can't be a broadcast or multicast unless IPDF_ALLOW_MCBC is set.
2011 2011 * If IPDF_VERIFY_DST is set, the destination must be reachable.
2012 2012 * Otherwise the destination needn't be reachable.
2013 2013 *
2014 2014 * If we match on a reject or black hole, then we've got a
2015 2015 * local failure. May as well fail out the connect() attempt,
2016 2016 * since it's never going to succeed.
2017 2017 */
2018 2018 if (ire->ire_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
2019 2019 /*
2020 2020 * If we're verifying destination reachability, we always want
2021 2021 * to complain here.
2022 2022 *
2023 2023 * If we're not verifying destination reachability but the
2024 2024 * destination has a route, we still want to fail on the
2025 2025 * temporary address and broadcast address tests.
2026 2026 *
2027 2027 * In both cases do we let the code continue so some reasonable
2028 2028 * information is returned to the caller. That enables the
2029 2029 * caller to use (and even cache) the IRE. conn_ip_ouput will
2030 2030 * use the generation mismatch path to check for the unreachable
2031 2031 * case thereby avoiding any specific check in the main path.
2032 2032 */
2033 2033 ASSERT(generation == IRE_GENERATION_VERIFY);
2034 2034 if (flags & IPDF_VERIFY_DST) {
2035 2035 /*
2036 2036 * Set errno but continue to set up ixa_ire to be
2037 2037 * the RTF_REJECT|RTF_BLACKHOLE IRE.
2038 2038 * That allows callers to use ip_output to get an
2039 2039 * ICMP error back.
2040 2040 */
2041 2041 if (!(ire->ire_type & IRE_HOST))
2042 2042 error = ENETUNREACH;
2043 2043 else
2044 2044 error = EHOSTUNREACH;
2045 2045 }
2046 2046 }
2047 2047
2048 2048 if ((ire->ire_type & (IRE_BROADCAST|IRE_MULTICAST)) &&
2049 2049 !(flags & IPDF_ALLOW_MCBC)) {
2050 2050 ire_refrele(ire);
2051 2051 ire = ire_reject(ipst, B_FALSE);
2052 2052 generation = IRE_GENERATION_VERIFY;
2053 2053 error = ENETUNREACH;
2054 2054 }
2055 2055
2056 2056 /* Cache things */
2057 2057 if (ixa->ixa_ire != NULL)
2058 2058 ire_refrele_notr(ixa->ixa_ire);
2059 2059 #ifdef DEBUG
2060 2060 ire_refhold_notr(ire);
2061 2061 ire_refrele(ire);
2062 2062 #endif
2063 2063 ixa->ixa_ire = ire;
2064 2064 ixa->ixa_ire_generation = generation;
2065 2065
2066 2066 /*
2067 2067 * Ensure that ixa_dce is always set any time that ixa_ire is set,
2068 2068 * since some callers will send a packet to conn_ip_output() even if
2069 2069 * there's an error.
2070 2070 */
2071 2071 ifindex = 0;
2072 2072 if (IN6_IS_ADDR_LINKSCOPE(dst_addr)) {
2073 2073 /* If we are creating a DCE we'd better have an ifindex */
2074 2074 if (ill != NULL)
2075 2075 ifindex = ill->ill_phyint->phyint_ifindex;
2076 2076 else
2077 2077 flags &= ~IPDF_UNIQUE_DCE;
2078 2078 }
2079 2079
2080 2080 if (flags & IPDF_UNIQUE_DCE) {
2081 2081 /* Fallback to the default dce if allocation fails */
2082 2082 dce = dce_lookup_and_add_v6(dst_addr, ifindex, ipst);
2083 2083 if (dce != NULL) {
2084 2084 generation = dce->dce_generation;
2085 2085 } else {
2086 2086 dce = dce_lookup_v6(dst_addr, ifindex, ipst,
2087 2087 &generation);
2088 2088 }
2089 2089 } else {
2090 2090 dce = dce_lookup_v6(dst_addr, ifindex, ipst, &generation);
2091 2091 }
2092 2092 ASSERT(dce != NULL);
2093 2093 if (ixa->ixa_dce != NULL)
2094 2094 dce_refrele_notr(ixa->ixa_dce);
2095 2095 #ifdef DEBUG
2096 2096 dce_refhold_notr(dce);
2097 2097 dce_refrele(dce);
2098 2098 #endif
2099 2099 ixa->ixa_dce = dce;
2100 2100 ixa->ixa_dce_generation = generation;
2101 2101
2102 2102
2103 2103 /*
2104 2104 * For multicast with multirt we have a flag passed back from
2105 2105 * ire_lookup_multi_ill_v6 since we don't have an IRE for each
2106 2106 * possible multicast address.
2107 2107 * We also need a flag for multicast since we can't check
2108 2108 * whether RTF_MULTIRT is set in ixa_ire for multicast.
2109 2109 */
2110 2110 if (multirt) {
2111 2111 ixa->ixa_postfragfn = ip_postfrag_multirt_v6;
2112 2112 ixa->ixa_flags |= IXAF_MULTIRT_MULTICAST;
2113 2113 } else {
2114 2114 ixa->ixa_postfragfn = ire->ire_postfragfn;
2115 2115 ixa->ixa_flags &= ~IXAF_MULTIRT_MULTICAST;
2116 2116 }
2117 2117 if (!(ire->ire_flags & (RTF_REJECT|RTF_BLACKHOLE))) {
2118 2118 /* Get an nce to cache. */
2119 2119 nce = ire_to_nce(ire, NULL, firsthop);
2120 2120 if (nce == NULL) {
2121 2121 /* Allocation failure? */
2122 2122 ixa->ixa_ire_generation = IRE_GENERATION_VERIFY;
2123 2123 } else {
2124 2124 if (ixa->ixa_nce != NULL)
2125 2125 nce_refrele(ixa->ixa_nce);
2126 2126 ixa->ixa_nce = nce;
2127 2127 }
2128 2128 }
2129 2129
2130 2130 /*
2131 2131 * If the source address is a loopback address, the
2132 2132 * destination had best be local or multicast.
2133 2133 * If we are sending to an IRE_LOCAL using a loopback source then
2134 2134 * it had better be the same zoneid.
2135 2135 */
2136 2136 if (IN6_IS_ADDR_LOOPBACK(src_addrp)) {
2137 2137 if ((ire->ire_type & IRE_LOCAL) && ire->ire_zoneid != zoneid) {
2138 2138 ire = NULL; /* Stored in ixa_ire */
2139 2139 error = EADDRNOTAVAIL;
2140 2140 goto bad_addr;
2141 2141 }
2142 2142 if (!(ire->ire_type & (IRE_LOOPBACK|IRE_LOCAL|IRE_MULTICAST))) {
2143 2143 ire = NULL; /* Stored in ixa_ire */
2144 2144 error = EADDRNOTAVAIL;
2145 2145 goto bad_addr;
2146 2146 }
2147 2147 }
2148 2148
2149 2149 /*
2150 2150 * Does the caller want us to pick a source address?
2151 2151 */
2152 2152 if (flags & IPDF_SELECT_SRC) {
2153 2153 in6_addr_t src_addr;
2154 2154
2155 2155 /*
2156 2156 * We use use ire_nexthop_ill to avoid the under ipmp
2157 2157 * interface for source address selection. Note that for ipmp
2158 2158 * probe packets, ixa_ifindex would have been specified, and
2159 2159 * the ip_select_route() invocation would have picked an ire
2160 2160 * will ire_ill pointing at an under interface.
2161 2161 */
2162 2162 ill = ire_nexthop_ill(ire);
2163 2163
2164 2164 /* If unreachable we have no ill but need some source */
2165 2165 if (ill == NULL) {
2166 2166 src_addr = ipv6_loopback;
2167 2167 /* Make sure we look for a better source address */
2168 2168 generation = SRC_GENERATION_VERIFY;
2169 2169 } else {
2170 2170 error = ip_select_source_v6(ill, &setsrc, dst_addr,
2171 2171 zoneid, ipst, B_FALSE, ixa->ixa_src_preferences,
2172 2172 &src_addr, &generation, NULL);
2173 2173 if (error != 0) {
2174 2174 ire = NULL; /* Stored in ixa_ire */
2175 2175 goto bad_addr;
2176 2176 }
2177 2177 }
2178 2178
2179 2179 /*
2180 2180 * We allow the source address to to down.
2181 2181 * However, we check that we don't use the loopback address
2182 2182 * as a source when sending out on the wire.
2183 2183 */
2184 2184 if (IN6_IS_ADDR_LOOPBACK(&src_addr) &&
2185 2185 !(ire->ire_type & (IRE_LOCAL|IRE_LOOPBACK|IRE_MULTICAST)) &&
2186 2186 !(ire->ire_flags & (RTF_REJECT|RTF_BLACKHOLE))) {
2187 2187 ire = NULL; /* Stored in ixa_ire */
2188 2188 error = EADDRNOTAVAIL;
2189 2189 goto bad_addr;
2190 2190 }
2191 2191
2192 2192 *src_addrp = src_addr;
2193 2193 ixa->ixa_src_generation = generation;
2194 2194 }
2195 2195
2196 2196 /*
2197 2197 * Make sure we don't leave an unreachable ixa_nce in place
2198 2198 * since ip_select_route is used when we unplumb i.e., remove
2199 2199 * references on ixa_ire, ixa_nce, and ixa_dce.
2200 2200 */
2201 2201 nce = ixa->ixa_nce;
2202 2202 if (nce != NULL && nce->nce_is_condemned) {
2203 2203 nce_refrele(nce);
2204 2204 ixa->ixa_nce = NULL;
2205 2205 ixa->ixa_ire_generation = IRE_GENERATION_VERIFY;
2206 2206 }
2207 2207
2208 2208 /*
2209 2209 * Note that IPv6 multicast supports PMTU discovery unlike IPv4
2210 2210 * multicast. But pmtu discovery is only enabled for connected
2211 2211 * sockets in general.
2212 2212 */
2213 2213
2214 2214 /*
2215 2215 * Set initial value for fragmentation limit. Either conn_ip_output
2216 2216 * or ULP might updates it when there are routing changes.
2217 2217 * Handles a NULL ixa_ire->ire_ill or a NULL ixa_nce for RTF_REJECT.
2218 2218 */
2219 2219 pmtu = ip_get_pmtu(ixa);
2220 2220 ixa->ixa_fragsize = pmtu;
2221 2221 /* Make sure ixa_fragsize and ixa_pmtu remain identical */
2222 2222 if (ixa->ixa_flags & IXAF_VERIFY_PMTU)
2223 2223 ixa->ixa_pmtu = pmtu;
2224 2224
2225 2225 /*
2226 2226 * Extract information useful for some transports.
2227 2227 * First we look for DCE metrics. Then we take what we have in
2228 2228 * the metrics in the route, where the offlink is used if we have
2229 2229 * one.
2230 2230 */
2231 2231 if (uinfo != NULL) {
2232 2232 bzero(uinfo, sizeof (*uinfo));
2233 2233
2234 2234 if (dce->dce_flags & DCEF_UINFO)
2235 2235 *uinfo = dce->dce_uinfo;
2236 2236
2237 2237 rts_merge_metrics(uinfo, &ire->ire_metrics);
2238 2238
2239 2239 /* Allow ire_metrics to decrease the path MTU from above */
2240 2240 if (uinfo->iulp_mtu == 0 || uinfo->iulp_mtu > pmtu)
2241 2241 uinfo->iulp_mtu = pmtu;
2242 2242
2243 2243 uinfo->iulp_localnet = (ire->ire_type & IRE_ONLINK) != 0;
2244 2244 uinfo->iulp_loopback = (ire->ire_type & IRE_LOOPBACK) != 0;
2245 2245 uinfo->iulp_local = (ire->ire_type & IRE_LOCAL) != 0;
2246 2246 }
2247 2247
2248 2248 if (ill != NULL)
2249 2249 ill_refrele(ill);
2250 2250
2251 2251 return (error);
2252 2252
2253 2253 bad_addr:
2254 2254 if (ire != NULL)
2255 2255 ire_refrele(ire);
2256 2256
2257 2257 if (ill != NULL)
2258 2258 ill_refrele(ill);
2259 2259
2260 2260 /*
2261 2261 * Make sure we don't leave an unreachable ixa_nce in place
2262 2262 * since ip_select_route is used when we unplumb i.e., remove
2263 2263 * references on ixa_ire, ixa_nce, and ixa_dce.
2264 2264 */
2265 2265 nce = ixa->ixa_nce;
2266 2266 if (nce != NULL && nce->nce_is_condemned) {
2267 2267 nce_refrele(nce);
2268 2268 ixa->ixa_nce = NULL;
2269 2269 ixa->ixa_ire_generation = IRE_GENERATION_VERIFY;
2270 2270 }
2271 2271
2272 2272 return (error);
2273 2273 }
2274 2274
2275 2275 /*
2276 2276 * Handle protocols with which IP is less intimate. There
2277 2277 * can be more than one stream bound to a particular
2278 2278 * protocol. When this is the case, normally each one gets a copy
2279 2279 * of any incoming packets.
2280 2280 *
2281 2281 * Zones notes:
2282 2282 * Packets will be distributed to conns in all zones. This is really only
2283 2283 * useful for ICMPv6 as only applications in the global zone can create raw
2284 2284 * sockets for other protocols.
2285 2285 */
2286 2286 void
2287 2287 ip_fanout_proto_v6(mblk_t *mp, ip6_t *ip6h, ip_recv_attr_t *ira)
2288 2288 {
2289 2289 mblk_t *mp1;
2290 2290 in6_addr_t laddr = ip6h->ip6_dst;
2291 2291 conn_t *connp, *first_connp, *next_connp;
2292 2292 connf_t *connfp;
2293 2293 ill_t *ill = ira->ira_ill;
2294 2294 ip_stack_t *ipst = ill->ill_ipst;
2295 2295
2296 2296 connfp = &ipst->ips_ipcl_proto_fanout_v6[ira->ira_protocol];
2297 2297 mutex_enter(&connfp->connf_lock);
2298 2298 connp = connfp->connf_head;
2299 2299 for (connp = connfp->connf_head; connp != NULL;
2300 2300 connp = connp->conn_next) {
2301 2301 /* Note: IPCL_PROTO_MATCH_V6 includes conn_wantpacket */
2302 2302 if (IPCL_PROTO_MATCH_V6(connp, ira, ip6h) &&
2303 2303 (!(ira->ira_flags & IRAF_SYSTEM_LABELED) ||
2304 2304 tsol_receive_local(mp, &laddr, IPV6_VERSION, ira, connp)))
2305 2305 break;
2306 2306 }
2307 2307
2308 2308 if (connp == NULL) {
2309 2309 /*
2310 2310 * No one bound to this port. Is
2311 2311 * there a client that wants all
2312 2312 * unclaimed datagrams?
2313 2313 */
2314 2314 mutex_exit(&connfp->connf_lock);
2315 2315 ip_fanout_send_icmp_v6(mp, ICMP6_PARAM_PROB,
2316 2316 ICMP6_PARAMPROB_NEXTHEADER, ira);
2317 2317 return;
2318 2318 }
2319 2319
2320 2320 ASSERT(IPCL_IS_NONSTR(connp) || connp->conn_rq != NULL);
2321 2321
2322 2322 CONN_INC_REF(connp);
2323 2323 first_connp = connp;
2324 2324
2325 2325 /*
2326 2326 * XXX: Fix the multiple protocol listeners case. We should not
2327 2327 * be walking the conn->conn_next list here.
2328 2328 */
2329 2329 connp = connp->conn_next;
2330 2330 for (;;) {
2331 2331 while (connp != NULL) {
2332 2332 /* Note: IPCL_PROTO_MATCH_V6 includes conn_wantpacket */
2333 2333 if (IPCL_PROTO_MATCH_V6(connp, ira, ip6h) &&
2334 2334 (!(ira->ira_flags & IRAF_SYSTEM_LABELED) ||
2335 2335 tsol_receive_local(mp, &laddr, IPV6_VERSION,
2336 2336 ira, connp)))
2337 2337 break;
2338 2338 connp = connp->conn_next;
2339 2339 }
2340 2340
2341 2341 if (connp == NULL) {
2342 2342 /* No more interested clients */
2343 2343 connp = first_connp;
2344 2344 break;
2345 2345 }
2346 2346 if (((mp1 = dupmsg(mp)) == NULL) &&
2347 2347 ((mp1 = copymsg(mp)) == NULL)) {
2348 2348 /* Memory allocation failed */
2349 2349 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
2350 2350 ip_drop_input("ipIfStatsInDiscards", mp, ill);
2351 2351 connp = first_connp;
2352 2352 break;
2353 2353 }
2354 2354
2355 2355 CONN_INC_REF(connp);
2356 2356 mutex_exit(&connfp->connf_lock);
2357 2357
2358 2358 ip_fanout_proto_conn(connp, mp1, NULL, (ip6_t *)mp1->b_rptr,
2359 2359 ira);
2360 2360
2361 2361 mutex_enter(&connfp->connf_lock);
2362 2362 /* Follow the next pointer before releasing the conn. */
2363 2363 next_connp = connp->conn_next;
2364 2364 CONN_DEC_REF(connp);
2365 2365 connp = next_connp;
2366 2366 }
2367 2367
2368 2368 /* Last one. Send it upstream. */
2369 2369 mutex_exit(&connfp->connf_lock);
2370 2370
2371 2371 ip_fanout_proto_conn(connp, mp, NULL, ip6h, ira);
2372 2372
2373 2373 CONN_DEC_REF(connp);
2374 2374 }
2375 2375
2376 2376 /*
2377 2377 * Called when it is conceptually a ULP that would sent the packet
2378 2378 * e.g., port unreachable and nexthdr unknown. Check that the packet
2379 2379 * would have passed the IPsec global policy before sending the error.
2380 2380 *
2381 2381 * Send an ICMP error after patching up the packet appropriately.
2382 2382 * Uses ip_drop_input and bumps the appropriate MIB.
2383 2383 * For ICMP6_PARAMPROB_NEXTHEADER we determine the offset to use.
2384 2384 */
2385 2385 void
2386 2386 ip_fanout_send_icmp_v6(mblk_t *mp, uint_t icmp_type, uint8_t icmp_code,
2387 2387 ip_recv_attr_t *ira)
2388 2388 {
2389 2389 ip6_t *ip6h;
2390 2390 boolean_t secure;
2391 2391 ill_t *ill = ira->ira_ill;
2392 2392 ip_stack_t *ipst = ill->ill_ipst;
2393 2393 netstack_t *ns = ipst->ips_netstack;
2394 2394 ipsec_stack_t *ipss = ns->netstack_ipsec;
2395 2395
2396 2396 secure = ira->ira_flags & IRAF_IPSEC_SECURE;
2397 2397
2398 2398 /*
2399 2399 * We are generating an icmp error for some inbound packet.
2400 2400 * Called from all ip_fanout_(udp, tcp, proto) functions.
2401 2401 * Before we generate an error, check with global policy
2402 2402 * to see whether this is allowed to enter the system. As
2403 2403 * there is no "conn", we are checking with global policy.
2404 2404 */
2405 2405 ip6h = (ip6_t *)mp->b_rptr;
2406 2406 if (secure || ipss->ipsec_inbound_v6_policy_present) {
2407 2407 mp = ipsec_check_global_policy(mp, NULL, NULL, ip6h, ira, ns);
2408 2408 if (mp == NULL)
2409 2409 return;
2410 2410 }
2411 2411
2412 2412 /* We never send errors for protocols that we do implement */
2413 2413 if (ira->ira_protocol == IPPROTO_ICMPV6) {
2414 2414 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
2415 2415 ip_drop_input("ip_fanout_send_icmp_v6", mp, ill);
2416 2416 freemsg(mp);
2417 2417 return;
2418 2418 }
2419 2419
2420 2420 switch (icmp_type) {
2421 2421 case ICMP6_DST_UNREACH:
2422 2422 ASSERT(icmp_code == ICMP6_DST_UNREACH_NOPORT);
2423 2423
2424 2424 BUMP_MIB(ill->ill_ip_mib, udpIfStatsNoPorts);
2425 2425 ip_drop_input("ipIfStatsNoPorts", mp, ill);
2426 2426
2427 2427 icmp_unreachable_v6(mp, icmp_code, B_FALSE, ira);
2428 2428 break;
2429 2429 case ICMP6_PARAM_PROB:
2430 2430 ASSERT(icmp_code == ICMP6_PARAMPROB_NEXTHEADER);
2431 2431
2432 2432 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInUnknownProtos);
2433 2433 ip_drop_input("ipIfStatsInUnknownProtos", mp, ill);
2434 2434
2435 2435 /* Let the system determine the offset for this one */
2436 2436 icmp_param_problem_nexthdr_v6(mp, B_FALSE, ira);
2437 2437 break;
2438 2438 default:
2439 2439 #ifdef DEBUG
2440 2440 panic("ip_fanout_send_icmp_v6: wrong type");
2441 2441 /*NOTREACHED*/
2442 2442 #else
2443 2443 freemsg(mp);
2444 2444 break;
2445 2445 #endif
2446 2446 }
2447 2447 }
2448 2448
2449 2449 /*
2450 2450 * Fanout for UDP packets that are multicast or ICMP errors.
2451 2451 * (Unicast fanout is handled in ip_input_v6.)
2452 2452 *
2453 2453 * If SO_REUSEADDR is set all multicast packets
2454 2454 * will be delivered to all conns bound to the same port.
2455 2455 *
2456 2456 * Fanout for UDP packets.
2457 2457 * The caller puts <fport, lport> in the ports parameter.
2458 2458 * ire_type must be IRE_BROADCAST for multicast and broadcast packets.
2459 2459 *
2460 2460 * If SO_REUSEADDR is set all multicast and broadcast packets
2461 2461 * will be delivered to all conns bound to the same port.
2462 2462 *
2463 2463 * Zones notes:
2464 2464 * Earlier in ip_input on a system with multiple shared-IP zones we
2465 2465 * duplicate the multicast and broadcast packets and send them up
2466 2466 * with each explicit zoneid that exists on that ill.
2467 2467 * This means that here we can match the zoneid with SO_ALLZONES being special.
2468 2468 */
2469 2469 void
2470 2470 ip_fanout_udp_multi_v6(mblk_t *mp, ip6_t *ip6h, uint16_t lport, uint16_t fport,
2471 2471 ip_recv_attr_t *ira)
2472 2472 {
2473 2473 in6_addr_t laddr;
2474 2474 conn_t *connp;
2475 2475 connf_t *connfp;
2476 2476 in6_addr_t faddr;
2477 2477 ill_t *ill = ira->ira_ill;
2478 2478 ip_stack_t *ipst = ill->ill_ipst;
2479 2479
2480 2480 ASSERT(ira->ira_flags & (IRAF_MULTIBROADCAST|IRAF_ICMP_ERROR));
2481 2481
2482 2482 laddr = ip6h->ip6_dst;
2483 2483 faddr = ip6h->ip6_src;
2484 2484
2485 2485 /* Attempt to find a client stream based on destination port. */
2486 2486 connfp = &ipst->ips_ipcl_udp_fanout[IPCL_UDP_HASH(lport, ipst)];
2487 2487 mutex_enter(&connfp->connf_lock);
2488 2488 connp = connfp->connf_head;
2489 2489 while (connp != NULL) {
2490 2490 if ((IPCL_UDP_MATCH_V6(connp, lport, laddr, fport, faddr)) &&
2491 2491 conn_wantpacket_v6(connp, ira, ip6h) &&
2492 2492 (!(ira->ira_flags & IRAF_SYSTEM_LABELED) ||
2493 2493 tsol_receive_local(mp, &laddr, IPV6_VERSION, ira, connp)))
2494 2494 break;
2495 2495 connp = connp->conn_next;
2496 2496 }
2497 2497
2498 2498 if (connp == NULL)
2499 2499 goto notfound;
2500 2500
2501 2501 CONN_INC_REF(connp);
2502 2502
2503 2503 if (connp->conn_reuseaddr) {
2504 2504 conn_t *first_connp = connp;
2505 2505 conn_t *next_connp;
2506 2506 mblk_t *mp1;
2507 2507
2508 2508 connp = connp->conn_next;
2509 2509 for (;;) {
2510 2510 while (connp != NULL) {
2511 2511 if (IPCL_UDP_MATCH_V6(connp, lport, laddr,
2512 2512 fport, faddr) &&
2513 2513 conn_wantpacket_v6(connp, ira, ip6h) &&
2514 2514 (!(ira->ira_flags & IRAF_SYSTEM_LABELED) ||
2515 2515 tsol_receive_local(mp, &laddr, IPV6_VERSION,
2516 2516 ira, connp)))
2517 2517 break;
2518 2518 connp = connp->conn_next;
2519 2519 }
2520 2520 if (connp == NULL) {
2521 2521 /* No more interested clients */
2522 2522 connp = first_connp;
2523 2523 break;
2524 2524 }
2525 2525 if (((mp1 = dupmsg(mp)) == NULL) &&
2526 2526 ((mp1 = copymsg(mp)) == NULL)) {
2527 2527 /* Memory allocation failed */
2528 2528 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
2529 2529 ip_drop_input("ipIfStatsInDiscards", mp, ill);
2530 2530 connp = first_connp;
2531 2531 break;
2532 2532 }
2533 2533
2534 2534 CONN_INC_REF(connp);
2535 2535 mutex_exit(&connfp->connf_lock);
2536 2536
2537 2537 IP6_STAT(ipst, ip6_udp_fanmb);
2538 2538 ip_fanout_udp_conn(connp, mp1, NULL,
2539 2539 (ip6_t *)mp1->b_rptr, ira);
2540 2540
2541 2541 mutex_enter(&connfp->connf_lock);
2542 2542 /* Follow the next pointer before releasing the conn. */
2543 2543 next_connp = connp->conn_next;
2544 2544 IP6_STAT(ipst, ip6_udp_fanmb);
2545 2545 CONN_DEC_REF(connp);
2546 2546 connp = next_connp;
2547 2547 }
2548 2548 }
2549 2549
2550 2550 /* Last one. Send it upstream. */
2551 2551 mutex_exit(&connfp->connf_lock);
2552 2552
2553 2553 IP6_STAT(ipst, ip6_udp_fanmb);
2554 2554 ip_fanout_udp_conn(connp, mp, NULL, ip6h, ira);
2555 2555 CONN_DEC_REF(connp);
2556 2556 return;
2557 2557
2558 2558 notfound:
2559 2559 mutex_exit(&connfp->connf_lock);
2560 2560 /*
2561 2561 * No one bound to this port. Is
2562 2562 * there a client that wants all
2563 2563 * unclaimed datagrams?
2564 2564 */
2565 2565 if (ipst->ips_ipcl_proto_fanout_v6[IPPROTO_UDP].connf_head != NULL) {
2566 2566 ASSERT(ira->ira_protocol == IPPROTO_UDP);
2567 2567 ip_fanout_proto_v6(mp, ip6h, ira);
2568 2568 } else {
2569 2569 ip_fanout_send_icmp_v6(mp, ICMP6_DST_UNREACH,
2570 2570 ICMP6_DST_UNREACH_NOPORT, ira);
2571 2571 }
2572 2572 }
2573 2573
2574 2574 /*
2575 2575 * int ip_find_hdr_v6()
2576 2576 *
2577 2577 * This routine is used by the upper layer protocols, iptun, and IPsec:
2578 2578 * - Set extension header pointers to appropriate locations
2579 2579 * - Determine IPv6 header length and return it
2580 2580 * - Return a pointer to the last nexthdr value
2581 2581 *
2582 2582 * The caller must initialize ipp_fields.
2583 2583 * The upper layer protocols normally set label_separate which makes the
2584 2584 * routine put the TX label in ipp_label_v6. If this is not set then
2585 2585 * the hop-by-hop options including the label are placed in ipp_hopopts.
2586 2586 *
2587 2587 * NOTE: If multiple extension headers of the same type are present,
2588 2588 * ip_find_hdr_v6() will set the respective extension header pointers
2589 2589 * to the first one that it encounters in the IPv6 header. It also
2590 2590 * skips fragment headers. This routine deals with malformed packets
2591 2591 * of various sorts in which case the returned length is up to the
2592 2592 * malformed part.
2593 2593 */
2594 2594 int
2595 2595 ip_find_hdr_v6(mblk_t *mp, ip6_t *ip6h, boolean_t label_separate, ip_pkt_t *ipp,
2596 2596 uint8_t *nexthdrp)
2597 2597 {
2598 2598 uint_t length, ehdrlen;
2599 2599 uint8_t nexthdr;
2600 2600 uint8_t *whereptr, *endptr;
2601 2601 ip6_dest_t *tmpdstopts;
2602 2602 ip6_rthdr_t *tmprthdr;
2603 2603 ip6_hbh_t *tmphopopts;
2604 2604 ip6_frag_t *tmpfraghdr;
2605 2605
2606 2606 ipp->ipp_fields |= IPPF_HOPLIMIT | IPPF_TCLASS | IPPF_ADDR;
2607 2607 ipp->ipp_hoplimit = ip6h->ip6_hops;
2608 2608 ipp->ipp_tclass = IPV6_FLOW_TCLASS(ip6h->ip6_flow);
2609 2609 ipp->ipp_addr = ip6h->ip6_dst;
2610 2610
2611 2611 length = IPV6_HDR_LEN;
2612 2612 whereptr = ((uint8_t *)&ip6h[1]); /* point to next hdr */
2613 2613 endptr = mp->b_wptr;
2614 2614
2615 2615 nexthdr = ip6h->ip6_nxt;
2616 2616 while (whereptr < endptr) {
2617 2617 /* Is there enough left for len + nexthdr? */
2618 2618 if (whereptr + MIN_EHDR_LEN > endptr)
2619 2619 goto done;
2620 2620
2621 2621 switch (nexthdr) {
2622 2622 case IPPROTO_HOPOPTS: {
2623 2623 /* We check for any CIPSO */
2624 2624 uchar_t *secopt;
2625 2625 boolean_t hbh_needed;
2626 2626 uchar_t *after_secopt;
2627 2627
2628 2628 tmphopopts = (ip6_hbh_t *)whereptr;
2629 2629 ehdrlen = 8 * (tmphopopts->ip6h_len + 1);
2630 2630 if ((uchar_t *)tmphopopts + ehdrlen > endptr)
2631 2631 goto done;
2632 2632 nexthdr = tmphopopts->ip6h_nxt;
2633 2633
2634 2634 if (!label_separate) {
2635 2635 secopt = NULL;
2636 2636 after_secopt = whereptr;
2637 2637 } else {
2638 2638 /*
2639 2639 * We have dropped packets with bad options in
2640 2640 * ip6_input. No need to check return value
2641 2641 * here.
2642 2642 */
2643 2643 (void) tsol_find_secopt_v6(whereptr, ehdrlen,
2644 2644 &secopt, &after_secopt, &hbh_needed);
2645 2645 }
2646 2646 if (secopt != NULL && after_secopt - whereptr > 0) {
2647 2647 ipp->ipp_fields |= IPPF_LABEL_V6;
2648 2648 ipp->ipp_label_v6 = secopt;
2649 2649 ipp->ipp_label_len_v6 = after_secopt - whereptr;
2650 2650 } else {
2651 2651 ipp->ipp_label_len_v6 = 0;
2652 2652 after_secopt = whereptr;
2653 2653 hbh_needed = B_TRUE;
2654 2654 }
2655 2655 /* return only 1st hbh */
2656 2656 if (hbh_needed && !(ipp->ipp_fields & IPPF_HOPOPTS)) {
2657 2657 ipp->ipp_fields |= IPPF_HOPOPTS;
2658 2658 ipp->ipp_hopopts = (ip6_hbh_t *)after_secopt;
2659 2659 ipp->ipp_hopoptslen = ehdrlen -
2660 2660 ipp->ipp_label_len_v6;
2661 2661 }
2662 2662 break;
2663 2663 }
2664 2664 case IPPROTO_DSTOPTS:
2665 2665 tmpdstopts = (ip6_dest_t *)whereptr;
2666 2666 ehdrlen = 8 * (tmpdstopts->ip6d_len + 1);
2667 2667 if ((uchar_t *)tmpdstopts + ehdrlen > endptr)
2668 2668 goto done;
2669 2669 nexthdr = tmpdstopts->ip6d_nxt;
2670 2670 /*
2671 2671 * ipp_dstopts is set to the destination header after a
2672 2672 * routing header.
2673 2673 * Assume it is a post-rthdr destination header
2674 2674 * and adjust when we find an rthdr.
2675 2675 */
2676 2676 if (!(ipp->ipp_fields & IPPF_DSTOPTS)) {
2677 2677 ipp->ipp_fields |= IPPF_DSTOPTS;
2678 2678 ipp->ipp_dstopts = tmpdstopts;
2679 2679 ipp->ipp_dstoptslen = ehdrlen;
2680 2680 }
2681 2681 break;
2682 2682 case IPPROTO_ROUTING:
2683 2683 tmprthdr = (ip6_rthdr_t *)whereptr;
2684 2684 ehdrlen = 8 * (tmprthdr->ip6r_len + 1);
2685 2685 if ((uchar_t *)tmprthdr + ehdrlen > endptr)
2686 2686 goto done;
2687 2687 nexthdr = tmprthdr->ip6r_nxt;
2688 2688 /* return only 1st rthdr */
2689 2689 if (!(ipp->ipp_fields & IPPF_RTHDR)) {
2690 2690 ipp->ipp_fields |= IPPF_RTHDR;
2691 2691 ipp->ipp_rthdr = tmprthdr;
2692 2692 ipp->ipp_rthdrlen = ehdrlen;
2693 2693 }
2694 2694 /*
2695 2695 * Make any destination header we've seen be a
2696 2696 * pre-rthdr destination header.
2697 2697 */
2698 2698 if (ipp->ipp_fields & IPPF_DSTOPTS) {
2699 2699 ipp->ipp_fields &= ~IPPF_DSTOPTS;
2700 2700 ipp->ipp_fields |= IPPF_RTHDRDSTOPTS;
2701 2701 ipp->ipp_rthdrdstopts = ipp->ipp_dstopts;
2702 2702 ipp->ipp_dstopts = NULL;
2703 2703 ipp->ipp_rthdrdstoptslen = ipp->ipp_dstoptslen;
2704 2704 ipp->ipp_dstoptslen = 0;
2705 2705 }
2706 2706 break;
2707 2707 case IPPROTO_FRAGMENT:
2708 2708 tmpfraghdr = (ip6_frag_t *)whereptr;
2709 2709 ehdrlen = sizeof (ip6_frag_t);
2710 2710 if ((uchar_t *)tmpfraghdr + ehdrlen > endptr)
2711 2711 goto done;
2712 2712 nexthdr = tmpfraghdr->ip6f_nxt;
2713 2713 if (!(ipp->ipp_fields & IPPF_FRAGHDR)) {
2714 2714 ipp->ipp_fields |= IPPF_FRAGHDR;
2715 2715 ipp->ipp_fraghdr = tmpfraghdr;
2716 2716 ipp->ipp_fraghdrlen = ehdrlen;
2717 2717 }
2718 2718 break;
2719 2719 case IPPROTO_NONE:
2720 2720 default:
2721 2721 goto done;
2722 2722 }
2723 2723 length += ehdrlen;
2724 2724 whereptr += ehdrlen;
2725 2725 }
2726 2726 done:
2727 2727 if (nexthdrp != NULL)
2728 2728 *nexthdrp = nexthdr;
2729 2729 return (length);
2730 2730 }
2731 2731
2732 2732 /*
2733 2733 * Try to determine where and what are the IPv6 header length and
2734 2734 * pointer to nexthdr value for the upper layer protocol (or an
2735 2735 * unknown next hdr).
2736 2736 *
2737 2737 * Parameters returns a pointer to the nexthdr value;
2738 2738 * Must handle malformed packets of various sorts.
2739 2739 * Function returns failure for malformed cases.
2740 2740 */
2741 2741 boolean_t
2742 2742 ip_hdr_length_nexthdr_v6(mblk_t *mp, ip6_t *ip6h, uint16_t *hdr_length_ptr,
2743 2743 uint8_t **nexthdrpp)
2744 2744 {
2745 2745 uint16_t length;
2746 2746 uint_t ehdrlen;
2747 2747 uint8_t *nexthdrp;
2748 2748 uint8_t *whereptr;
2749 2749 uint8_t *endptr;
2750 2750 ip6_dest_t *desthdr;
2751 2751 ip6_rthdr_t *rthdr;
2752 2752 ip6_frag_t *fraghdr;
2753 2753
2754 2754 ASSERT(IPH_HDR_VERSION(ip6h) == IPV6_VERSION);
2755 2755 length = IPV6_HDR_LEN;
2756 2756 whereptr = ((uint8_t *)&ip6h[1]); /* point to next hdr */
2757 2757 endptr = mp->b_wptr;
2758 2758
2759 2759 nexthdrp = &ip6h->ip6_nxt;
2760 2760 while (whereptr < endptr) {
2761 2761 /* Is there enough left for len + nexthdr? */
2762 2762 if (whereptr + MIN_EHDR_LEN > endptr)
2763 2763 break;
2764 2764
2765 2765 switch (*nexthdrp) {
2766 2766 case IPPROTO_HOPOPTS:
2767 2767 case IPPROTO_DSTOPTS:
2768 2768 /* Assumes the headers are identical for hbh and dst */
2769 2769 desthdr = (ip6_dest_t *)whereptr;
2770 2770 ehdrlen = 8 * (desthdr->ip6d_len + 1);
2771 2771 if ((uchar_t *)desthdr + ehdrlen > endptr)
2772 2772 return (B_FALSE);
2773 2773 nexthdrp = &desthdr->ip6d_nxt;
2774 2774 break;
2775 2775 case IPPROTO_ROUTING:
2776 2776 rthdr = (ip6_rthdr_t *)whereptr;
2777 2777 ehdrlen = 8 * (rthdr->ip6r_len + 1);
2778 2778 if ((uchar_t *)rthdr + ehdrlen > endptr)
2779 2779 return (B_FALSE);
2780 2780 nexthdrp = &rthdr->ip6r_nxt;
2781 2781 break;
2782 2782 case IPPROTO_FRAGMENT:
2783 2783 fraghdr = (ip6_frag_t *)whereptr;
2784 2784 ehdrlen = sizeof (ip6_frag_t);
2785 2785 if ((uchar_t *)&fraghdr[1] > endptr)
2786 2786 return (B_FALSE);
2787 2787 nexthdrp = &fraghdr->ip6f_nxt;
2788 2788 break;
2789 2789 case IPPROTO_NONE:
2790 2790 /* No next header means we're finished */
2791 2791 default:
2792 2792 *hdr_length_ptr = length;
2793 2793 *nexthdrpp = nexthdrp;
2794 2794 return (B_TRUE);
2795 2795 }
2796 2796 length += ehdrlen;
2797 2797 whereptr += ehdrlen;
2798 2798 *hdr_length_ptr = length;
2799 2799 *nexthdrpp = nexthdrp;
2800 2800 }
2801 2801 switch (*nexthdrp) {
2802 2802 case IPPROTO_HOPOPTS:
2803 2803 case IPPROTO_DSTOPTS:
2804 2804 case IPPROTO_ROUTING:
2805 2805 case IPPROTO_FRAGMENT:
2806 2806 /*
2807 2807 * If any know extension headers are still to be processed,
2808 2808 * the packet's malformed (or at least all the IP header(s) are
2809 2809 * not in the same mblk - and that should never happen.
2810 2810 */
2811 2811 return (B_FALSE);
2812 2812
2813 2813 default:
2814 2814 /*
2815 2815 * If we get here, we know that all of the IP headers were in
2816 2816 * the same mblk, even if the ULP header is in the next mblk.
2817 2817 */
2818 2818 *hdr_length_ptr = length;
2819 2819 *nexthdrpp = nexthdrp;
2820 2820 return (B_TRUE);
2821 2821 }
2822 2822 }
2823 2823
2824 2824 /*
2825 2825 * Return the length of the IPv6 related headers (including extension headers)
2826 2826 * Returns a length even if the packet is malformed.
2827 2827 */
2828 2828 int
2829 2829 ip_hdr_length_v6(mblk_t *mp, ip6_t *ip6h)
2830 2830 {
2831 2831 uint16_t hdr_len;
2832 2832 uint8_t *nexthdrp;
2833 2833
2834 2834 (void) ip_hdr_length_nexthdr_v6(mp, ip6h, &hdr_len, &nexthdrp);
2835 2835 return (hdr_len);
2836 2836 }
2837 2837
2838 2838 /*
2839 2839 * Parse and process any hop-by-hop or destination options.
2840 2840 *
2841 2841 * Assumes that q is an ill read queue so that ICMP errors for link-local
2842 2842 * destinations are sent out the correct interface.
2843 2843 *
2844 2844 * Returns -1 if there was an error and mp has been consumed.
2845 2845 * Returns 0 if no special action is needed.
2846 2846 * Returns 1 if the packet contained a router alert option for this node
2847 2847 * which is verified to be "interesting/known" for our implementation.
2848 2848 *
2849 2849 * XXX Note: In future as more hbh or dest options are defined,
2850 2850 * it may be better to have different routines for hbh and dest
2851 2851 * options as opt_type fields other than IP6OPT_PAD1 and IP6OPT_PADN
2852 2852 * may have same value in different namespaces. Or is it same namespace ??
2853 2853 * Current code checks for each opt_type (other than pads) if it is in
2854 2854 * the expected nexthdr (hbh or dest)
2855 2855 */
2856 2856 int
2857 2857 ip_process_options_v6(mblk_t *mp, ip6_t *ip6h,
2858 2858 uint8_t *optptr, uint_t optlen, uint8_t hdr_type, ip_recv_attr_t *ira)
2859 2859 {
2860 2860 uint8_t opt_type;
2861 2861 uint_t optused;
2862 2862 int ret = 0;
2863 2863 const char *errtype;
2864 2864 ill_t *ill = ira->ira_ill;
2865 2865 ip_stack_t *ipst = ill->ill_ipst;
2866 2866
2867 2867 while (optlen != 0) {
2868 2868 opt_type = *optptr;
2869 2869 if (opt_type == IP6OPT_PAD1) {
2870 2870 optused = 1;
2871 2871 } else {
2872 2872 if (optlen < 2)
2873 2873 goto bad_opt;
2874 2874 errtype = "malformed";
2875 2875 if (opt_type == ip6opt_ls) {
2876 2876 optused = 2 + optptr[1];
2877 2877 if (optused > optlen)
2878 2878 goto bad_opt;
2879 2879 } else switch (opt_type) {
2880 2880 case IP6OPT_PADN:
2881 2881 /*
2882 2882 * Note:We don't verify that (N-2) pad octets
2883 2883 * are zero as required by spec. Adhere to
2884 2884 * "be liberal in what you accept..." part of
2885 2885 * implementation philosophy (RFC791,RFC1122)
2886 2886 */
2887 2887 optused = 2 + optptr[1];
2888 2888 if (optused > optlen)
2889 2889 goto bad_opt;
2890 2890 break;
2891 2891
2892 2892 case IP6OPT_JUMBO:
2893 2893 if (hdr_type != IPPROTO_HOPOPTS)
2894 2894 goto opt_error;
2895 2895 goto opt_error; /* XXX Not implemented! */
2896 2896
2897 2897 case IP6OPT_ROUTER_ALERT: {
2898 2898 struct ip6_opt_router *or;
2899 2899
2900 2900 if (hdr_type != IPPROTO_HOPOPTS)
2901 2901 goto opt_error;
2902 2902 optused = 2 + optptr[1];
2903 2903 if (optused > optlen)
2904 2904 goto bad_opt;
2905 2905 or = (struct ip6_opt_router *)optptr;
2906 2906 /* Check total length and alignment */
2907 2907 if (optused != sizeof (*or) ||
2908 2908 ((uintptr_t)or->ip6or_value & 0x1) != 0)
2909 2909 goto opt_error;
2910 2910 /* Check value */
2911 2911 switch (*((uint16_t *)or->ip6or_value)) {
2912 2912 case IP6_ALERT_MLD:
2913 2913 case IP6_ALERT_RSVP:
2914 2914 ret = 1;
2915 2915 }
2916 2916 break;
2917 2917 }
2918 2918 case IP6OPT_HOME_ADDRESS: {
2919 2919 /*
2920 2920 * Minimal support for the home address option
2921 2921 * (which is required by all IPv6 nodes).
2922 2922 * Implement by just swapping the home address
2923 2923 * and source address.
2924 2924 * XXX Note: this has IPsec implications since
2925 2925 * AH needs to take this into account.
2926 2926 * Also, when IPsec is used we need to ensure
2927 2927 * that this is only processed once
2928 2928 * in the received packet (to avoid swapping
2929 2929 * back and forth).
2930 2930 * NOTE:This option processing is considered
2931 2931 * to be unsafe and prone to a denial of
2932 2932 * service attack.
2933 2933 * The current processing is not safe even with
2934 2934 * IPsec secured IP packets. Since the home
2935 2935 * address option processing requirement still
2936 2936 * is in the IETF draft and in the process of
2937 2937 * being redefined for its usage, it has been
2938 2938 * decided to turn off the option by default.
2939 2939 * If this section of code needs to be executed,
2940 2940 * ndd variable ip6_ignore_home_address_opt
2941 2941 * should be set to 0 at the user's own risk.
2942 2942 */
2943 2943 struct ip6_opt_home_address *oh;
2944 2944 in6_addr_t tmp;
2945 2945
2946 2946 if (ipst->ips_ipv6_ignore_home_address_opt)
2947 2947 goto opt_error;
2948 2948
2949 2949 if (hdr_type != IPPROTO_DSTOPTS)
2950 2950 goto opt_error;
2951 2951 optused = 2 + optptr[1];
2952 2952 if (optused > optlen)
2953 2953 goto bad_opt;
2954 2954
2955 2955 /*
2956 2956 * We did this dest. opt the first time
2957 2957 * around (i.e. before AH processing).
2958 2958 * If we've done AH... stop now.
2959 2959 */
2960 2960 if ((ira->ira_flags & IRAF_IPSEC_SECURE) &&
2961 2961 ira->ira_ipsec_ah_sa != NULL)
2962 2962 break;
2963 2963
2964 2964 oh = (struct ip6_opt_home_address *)optptr;
2965 2965 /* Check total length and alignment */
2966 2966 if (optused < sizeof (*oh) ||
2967 2967 ((uintptr_t)oh->ip6oh_addr & 0x7) != 0)
2968 2968 goto opt_error;
2969 2969 /* Swap ip6_src and the home address */
2970 2970 tmp = ip6h->ip6_src;
2971 2971 /* XXX Note: only 8 byte alignment option */
2972 2972 ip6h->ip6_src = *(in6_addr_t *)oh->ip6oh_addr;
2973 2973 *(in6_addr_t *)oh->ip6oh_addr = tmp;
2974 2974 break;
2975 2975 }
2976 2976
2977 2977 case IP6OPT_TUNNEL_LIMIT:
2978 2978 if (hdr_type != IPPROTO_DSTOPTS) {
2979 2979 goto opt_error;
2980 2980 }
2981 2981 optused = 2 + optptr[1];
2982 2982 if (optused > optlen) {
2983 2983 goto bad_opt;
2984 2984 }
2985 2985 if (optused != 3) {
2986 2986 goto opt_error;
2987 2987 }
2988 2988 break;
2989 2989
2990 2990 default:
2991 2991 errtype = "unknown";
2992 2992 /* FALLTHROUGH */
2993 2993 opt_error:
2994 2994 /* Determine which zone should send error */
2995 2995 switch (IP6OPT_TYPE(opt_type)) {
2996 2996 case IP6OPT_TYPE_SKIP:
2997 2997 optused = 2 + optptr[1];
2998 2998 if (optused > optlen)
2999 2999 goto bad_opt;
3000 3000 ip1dbg(("ip_process_options_v6: %s "
3001 3001 "opt 0x%x skipped\n",
3002 3002 errtype, opt_type));
3003 3003 break;
3004 3004 case IP6OPT_TYPE_DISCARD:
3005 3005 ip1dbg(("ip_process_options_v6: %s "
3006 3006 "opt 0x%x; packet dropped\n",
3007 3007 errtype, opt_type));
3008 3008 BUMP_MIB(ill->ill_ip_mib,
3009 3009 ipIfStatsInHdrErrors);
3010 3010 ip_drop_input("ipIfStatsInHdrErrors",
3011 3011 mp, ill);
3012 3012 freemsg(mp);
3013 3013 return (-1);
3014 3014 case IP6OPT_TYPE_ICMP:
3015 3015 BUMP_MIB(ill->ill_ip_mib,
3016 3016 ipIfStatsInHdrErrors);
3017 3017 ip_drop_input("ipIfStatsInHdrErrors",
3018 3018 mp, ill);
3019 3019 icmp_param_problem_v6(mp,
3020 3020 ICMP6_PARAMPROB_OPTION,
3021 3021 (uint32_t)(optptr -
3022 3022 (uint8_t *)ip6h),
3023 3023 B_FALSE, ira);
3024 3024 return (-1);
3025 3025 case IP6OPT_TYPE_FORCEICMP:
3026 3026 BUMP_MIB(ill->ill_ip_mib,
3027 3027 ipIfStatsInHdrErrors);
3028 3028 ip_drop_input("ipIfStatsInHdrErrors",
3029 3029 mp, ill);
3030 3030 icmp_param_problem_v6(mp,
3031 3031 ICMP6_PARAMPROB_OPTION,
3032 3032 (uint32_t)(optptr -
3033 3033 (uint8_t *)ip6h),
3034 3034 B_TRUE, ira);
3035 3035 return (-1);
3036 3036 default:
3037 3037 ASSERT(0);
3038 3038 }
3039 3039 }
3040 3040 }
3041 3041 optlen -= optused;
3042 3042 optptr += optused;
3043 3043 }
3044 3044 return (ret);
3045 3045
3046 3046 bad_opt:
3047 3047 /* Determine which zone should send error */
3048 3048 ip_drop_input("ICMP_PARAM_PROBLEM", mp, ill);
3049 3049 icmp_param_problem_v6(mp, ICMP6_PARAMPROB_OPTION,
3050 3050 (uint32_t)(optptr - (uint8_t *)ip6h),
3051 3051 B_FALSE, ira);
3052 3052 return (-1);
3053 3053 }
3054 3054
3055 3055 /*
3056 3056 * Process a routing header that is not yet empty.
3057 3057 * Because of RFC 5095, we now reject all route headers.
3058 3058 */
3059 3059 void
3060 3060 ip_process_rthdr(mblk_t *mp, ip6_t *ip6h, ip6_rthdr_t *rth,
3061 3061 ip_recv_attr_t *ira)
3062 3062 {
3063 3063 ill_t *ill = ira->ira_ill;
3064 3064 ip_stack_t *ipst = ill->ill_ipst;
3065 3065
3066 3066 ASSERT(rth->ip6r_segleft != 0);
3067 3067
3068 3068 if (!ipst->ips_ipv6_forward_src_routed) {
3069 3069 /* XXX Check for source routed out same interface? */
3070 3070 BUMP_MIB(ill->ill_ip_mib, ipIfStatsForwProhibits);
3071 3071 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInAddrErrors);
3072 3072 ip_drop_input("ipIfStatsInAddrErrors", mp, ill);
3073 3073 freemsg(mp);
3074 3074 return;
3075 3075 }
3076 3076
3077 3077 ip_drop_input("ICMP_PARAM_PROBLEM", mp, ill);
3078 3078 icmp_param_problem_v6(mp, ICMP6_PARAMPROB_HEADER,
3079 3079 (uint32_t)((uchar_t *)&rth->ip6r_type - (uchar_t *)ip6h),
3080 3080 B_FALSE, ira);
3081 3081 }
3082 3082
3083 3083 /*
3084 3084 * Read side put procedure for IPv6 module.
3085 3085 */
3086 3086 void
3087 3087 ip_rput_v6(queue_t *q, mblk_t *mp)
3088 3088 {
3089 3089 ill_t *ill;
3090 3090
3091 3091 ill = (ill_t *)q->q_ptr;
3092 3092 if (ill->ill_state_flags & (ILL_CONDEMNED | ILL_LL_SUBNET_PENDING)) {
3093 3093 union DL_primitives *dl;
3094 3094
3095 3095 dl = (union DL_primitives *)mp->b_rptr;
3096 3096 /*
3097 3097 * Things are opening or closing - only accept DLPI
3098 3098 * ack messages. If the stream is closing and ip_wsrv
3099 3099 * has completed, ip_close is out of the qwait, but has
3100 3100 * not yet completed qprocsoff. Don't proceed any further
3101 3101 * because the ill has been cleaned up and things hanging
3102 3102 * off the ill have been freed.
3103 3103 */
3104 3104 if ((mp->b_datap->db_type != M_PCPROTO) ||
3105 3105 (dl->dl_primitive == DL_UNITDATA_IND)) {
3106 3106 inet_freemsg(mp);
3107 3107 return;
3108 3108 }
3109 3109 }
3110 3110 if (DB_TYPE(mp) == M_DATA) {
3111 3111 struct mac_header_info_s mhi;
3112 3112
3113 3113 ip_mdata_to_mhi(ill, mp, &mhi);
3114 3114 ip_input_v6(ill, NULL, mp, &mhi);
3115 3115 } else {
3116 3116 ip_rput_notdata(ill, mp);
3117 3117 }
3118 3118 }
3119 3119
3120 3120 /*
3121 3121 * Walk through the IPv6 packet in mp and see if there's an AH header
3122 3122 * in it. See if the AH header needs to get done before other headers in
3123 3123 * the packet. (Worker function for ipsec_early_ah_v6().)
3124 3124 */
3125 3125 #define IPSEC_HDR_DONT_PROCESS 0
3126 3126 #define IPSEC_HDR_PROCESS 1
3127 3127 #define IPSEC_MEMORY_ERROR 2 /* or malformed packet */
3128 3128 static int
3129 3129 ipsec_needs_processing_v6(mblk_t *mp, uint8_t *nexthdr)
3130 3130 {
3131 3131 uint_t length;
3132 3132 uint_t ehdrlen;
3133 3133 uint8_t *whereptr;
3134 3134 uint8_t *endptr;
3135 3135 uint8_t *nexthdrp;
3136 3136 ip6_dest_t *desthdr;
3137 3137 ip6_rthdr_t *rthdr;
3138 3138 ip6_t *ip6h;
3139 3139
3140 3140 /*
3141 3141 * For now just pullup everything. In general, the less pullups,
3142 3142 * the better, but there's so much squirrelling through anyway,
3143 3143 * it's just easier this way.
3144 3144 */
3145 3145 if (!pullupmsg(mp, -1)) {
3146 3146 return (IPSEC_MEMORY_ERROR);
3147 3147 }
3148 3148
3149 3149 ip6h = (ip6_t *)mp->b_rptr;
3150 3150 length = IPV6_HDR_LEN;
3151 3151 whereptr = ((uint8_t *)&ip6h[1]); /* point to next hdr */
3152 3152 endptr = mp->b_wptr;
3153 3153
3154 3154 /*
3155 3155 * We can't just use the argument nexthdr in the place
3156 3156 * of nexthdrp becaue we don't dereference nexthdrp
3157 3157 * till we confirm whether it is a valid address.
3158 3158 */
3159 3159 nexthdrp = &ip6h->ip6_nxt;
3160 3160 while (whereptr < endptr) {
3161 3161 /* Is there enough left for len + nexthdr? */
3162 3162 if (whereptr + MIN_EHDR_LEN > endptr)
3163 3163 return (IPSEC_MEMORY_ERROR);
3164 3164
3165 3165 switch (*nexthdrp) {
3166 3166 case IPPROTO_HOPOPTS:
3167 3167 case IPPROTO_DSTOPTS:
3168 3168 /* Assumes the headers are identical for hbh and dst */
3169 3169 desthdr = (ip6_dest_t *)whereptr;
3170 3170 ehdrlen = 8 * (desthdr->ip6d_len + 1);
3171 3171 if ((uchar_t *)desthdr + ehdrlen > endptr)
3172 3172 return (IPSEC_MEMORY_ERROR);
3173 3173 /*
3174 3174 * Return DONT_PROCESS because the destination
3175 3175 * options header may be for each hop in a
3176 3176 * routing-header, and we only want AH if we're
3177 3177 * finished with routing headers.
3178 3178 */
3179 3179 if (*nexthdrp == IPPROTO_DSTOPTS)
3180 3180 return (IPSEC_HDR_DONT_PROCESS);
3181 3181 nexthdrp = &desthdr->ip6d_nxt;
3182 3182 break;
3183 3183 case IPPROTO_ROUTING:
3184 3184 rthdr = (ip6_rthdr_t *)whereptr;
3185 3185
3186 3186 /*
3187 3187 * If there's more hops left on the routing header,
3188 3188 * return now with DON'T PROCESS.
3189 3189 */
3190 3190 if (rthdr->ip6r_segleft > 0)
3191 3191 return (IPSEC_HDR_DONT_PROCESS);
3192 3192
3193 3193 ehdrlen = 8 * (rthdr->ip6r_len + 1);
3194 3194 if ((uchar_t *)rthdr + ehdrlen > endptr)
3195 3195 return (IPSEC_MEMORY_ERROR);
3196 3196 nexthdrp = &rthdr->ip6r_nxt;
3197 3197 break;
3198 3198 case IPPROTO_FRAGMENT:
3199 3199 /* Wait for reassembly */
3200 3200 return (IPSEC_HDR_DONT_PROCESS);
3201 3201 case IPPROTO_AH:
3202 3202 *nexthdr = IPPROTO_AH;
3203 3203 return (IPSEC_HDR_PROCESS);
3204 3204 case IPPROTO_NONE:
3205 3205 /* No next header means we're finished */
3206 3206 default:
3207 3207 return (IPSEC_HDR_DONT_PROCESS);
3208 3208 }
3209 3209 length += ehdrlen;
3210 3210 whereptr += ehdrlen;
3211 3211 }
3212 3212 /*
3213 3213 * Malformed/truncated packet.
3214 3214 */
3215 3215 return (IPSEC_MEMORY_ERROR);
3216 3216 }
3217 3217
3218 3218 /*
3219 3219 * Path for AH if options are present.
3220 3220 * Returns NULL if the mblk was consumed.
3221 3221 *
3222 3222 * Sometimes AH needs to be done before other IPv6 headers for security
3223 3223 * reasons. This function (and its ipsec_needs_processing_v6() above)
3224 3224 * indicates if that is so, and fans out to the appropriate IPsec protocol
3225 3225 * for the datagram passed in.
3226 3226 */
3227 3227 mblk_t *
3228 3228 ipsec_early_ah_v6(mblk_t *mp, ip_recv_attr_t *ira)
3229 3229 {
3230 3230 uint8_t nexthdr;
3231 3231 ah_t *ah;
3232 3232 ill_t *ill = ira->ira_ill;
3233 3233 ip_stack_t *ipst = ill->ill_ipst;
3234 3234 ipsec_stack_t *ipss = ipst->ips_netstack->netstack_ipsec;
3235 3235
3236 3236 switch (ipsec_needs_processing_v6(mp, &nexthdr)) {
3237 3237 case IPSEC_MEMORY_ERROR:
3238 3238 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
3239 3239 ip_drop_input("ipIfStatsInDiscards", mp, ill);
3240 3240 freemsg(mp);
3241 3241 return (NULL);
3242 3242 case IPSEC_HDR_DONT_PROCESS:
3243 3243 return (mp);
3244 3244 }
3245 3245
3246 3246 /* Default means send it to AH! */
3247 3247 ASSERT(nexthdr == IPPROTO_AH);
3248 3248
3249 3249 if (!ipsec_loaded(ipss)) {
3250 3250 ip_proto_not_sup(mp, ira);
3251 3251 return (NULL);
3252 3252 }
3253 3253
3254 3254 mp = ipsec_inbound_ah_sa(mp, ira, &ah);
3255 3255 if (mp == NULL)
3256 3256 return (NULL);
3257 3257 ASSERT(ah != NULL);
3258 3258 ASSERT(ira->ira_flags & IRAF_IPSEC_SECURE);
3259 3259 ASSERT(ira->ira_ipsec_ah_sa != NULL);
3260 3260 ASSERT(ira->ira_ipsec_ah_sa->ipsa_input_func != NULL);
3261 3261 mp = ira->ira_ipsec_ah_sa->ipsa_input_func(mp, ah, ira);
3262 3262
3263 3263 if (mp == NULL) {
3264 3264 /*
3265 3265 * Either it failed or is pending. In the former case
3266 3266 * ipIfStatsInDiscards was increased.
3267 3267 */
3268 3268 return (NULL);
3269 3269 }
3270 3270
3271 3271 /* we're done with IPsec processing, send it up */
3272 3272 ip_input_post_ipsec(mp, ira);
3273 3273 return (NULL);
3274 3274 }
3275 3275
3276 3276 /*
3277 3277 * Reassemble fragment.
3278 3278 * When it returns a completed message the first mblk will only contain
3279 3279 * the headers prior to the fragment header, with the nexthdr value updated
3280 3280 * to be the header after the fragment header.
3281 3281 */
3282 3282 mblk_t *
3283 3283 ip_input_fragment_v6(mblk_t *mp, ip6_t *ip6h,
3284 3284 ip6_frag_t *fraghdr, uint_t remlen, ip_recv_attr_t *ira)
3285 3285 {
3286 3286 uint32_t ident = ntohl(fraghdr->ip6f_ident);
3287 3287 uint16_t offset;
3288 3288 boolean_t more_frags;
3289 3289 uint8_t nexthdr = fraghdr->ip6f_nxt;
3290 3290 in6_addr_t *v6dst_ptr;
3291 3291 in6_addr_t *v6src_ptr;
3292 3292 uint_t end;
3293 3293 uint_t hdr_length;
3294 3294 size_t count;
3295 3295 ipf_t *ipf;
3296 3296 ipf_t **ipfp;
3297 3297 ipfb_t *ipfb;
3298 3298 mblk_t *mp1;
3299 3299 uint8_t ecn_info = 0;
3300 3300 size_t msg_len;
3301 3301 mblk_t *tail_mp;
3302 3302 mblk_t *t_mp;
3303 3303 boolean_t pruned = B_FALSE;
3304 3304 uint32_t sum_val;
3305 3305 uint16_t sum_flags;
3306 3306 ill_t *ill = ira->ira_ill;
3307 3307 ip_stack_t *ipst = ill->ill_ipst;
3308 3308 uint_t prev_nexthdr_offset;
3309 3309 uint8_t prev_nexthdr;
3310 3310 uint8_t *ptr;
3311 3311 uint32_t packet_size;
3312 3312
3313 3313 /*
3314 3314 * We utilize hardware computed checksum info only for UDP since
3315 3315 * IP fragmentation is a normal occurence for the protocol. In
3316 3316 * addition, checksum offload support for IP fragments carrying
3317 3317 * UDP payload is commonly implemented across network adapters.
3318 3318 */
3319 3319 ASSERT(ira->ira_rill != NULL);
3320 3320 if (nexthdr == IPPROTO_UDP && dohwcksum &&
3321 3321 ILL_HCKSUM_CAPABLE(ira->ira_rill) &&
3322 3322 (DB_CKSUMFLAGS(mp) & (HCK_FULLCKSUM | HCK_PARTIALCKSUM))) {
3323 3323 mblk_t *mp1 = mp->b_cont;
3324 3324 int32_t len;
3325 3325
3326 3326 /* Record checksum information from the packet */
3327 3327 sum_val = (uint32_t)DB_CKSUM16(mp);
3328 3328 sum_flags = DB_CKSUMFLAGS(mp);
3329 3329
3330 3330 /* fragmented payload offset from beginning of mblk */
3331 3331 offset = (uint16_t)((uchar_t *)&fraghdr[1] - mp->b_rptr);
3332 3332
3333 3333 if ((sum_flags & HCK_PARTIALCKSUM) &&
3334 3334 (mp1 == NULL || mp1->b_cont == NULL) &&
3335 3335 offset >= DB_CKSUMSTART(mp) &&
3336 3336 ((len = offset - DB_CKSUMSTART(mp)) & 1) == 0) {
3337 3337 uint32_t adj;
3338 3338 /*
3339 3339 * Partial checksum has been calculated by hardware
3340 3340 * and attached to the packet; in addition, any
3341 3341 * prepended extraneous data is even byte aligned.
3342 3342 * If any such data exists, we adjust the checksum;
3343 3343 * this would also handle any postpended data.
3344 3344 */
3345 3345 IP_ADJCKSUM_PARTIAL(mp->b_rptr + DB_CKSUMSTART(mp),
3346 3346 mp, mp1, len, adj);
3347 3347
3348 3348 /* One's complement subtract extraneous checksum */
3349 3349 if (adj >= sum_val)
3350 3350 sum_val = ~(adj - sum_val) & 0xFFFF;
3351 3351 else
3352 3352 sum_val -= adj;
3353 3353 }
3354 3354 } else {
3355 3355 sum_val = 0;
3356 3356 sum_flags = 0;
3357 3357 }
3358 3358
3359 3359 /* Clear hardware checksumming flag */
3360 3360 DB_CKSUMFLAGS(mp) = 0;
3361 3361
3362 3362 /*
3363 3363 * Determine the offset (from the begining of the IP header)
3364 3364 * of the nexthdr value which has IPPROTO_FRAGMENT. We use
3365 3365 * this when removing the fragment header from the packet.
3366 3366 * This packet consists of the IPv6 header, a potential
3367 3367 * hop-by-hop options header, a potential pre-routing-header
3368 3368 * destination options header, and a potential routing header.
3369 3369 */
3370 3370 prev_nexthdr_offset = (uint8_t *)&ip6h->ip6_nxt - (uint8_t *)ip6h;
3371 3371 prev_nexthdr = ip6h->ip6_nxt;
3372 3372 ptr = (uint8_t *)&ip6h[1];
3373 3373
3374 3374 if (prev_nexthdr == IPPROTO_HOPOPTS) {
3375 3375 ip6_hbh_t *hbh_hdr;
3376 3376 uint_t hdr_len;
3377 3377
3378 3378 hbh_hdr = (ip6_hbh_t *)ptr;
3379 3379 hdr_len = 8 * (hbh_hdr->ip6h_len + 1);
3380 3380 prev_nexthdr = hbh_hdr->ip6h_nxt;
3381 3381 prev_nexthdr_offset = (uint8_t *)&hbh_hdr->ip6h_nxt
3382 3382 - (uint8_t *)ip6h;
3383 3383 ptr += hdr_len;
3384 3384 }
3385 3385 if (prev_nexthdr == IPPROTO_DSTOPTS) {
3386 3386 ip6_dest_t *dest_hdr;
3387 3387 uint_t hdr_len;
3388 3388
3389 3389 dest_hdr = (ip6_dest_t *)ptr;
3390 3390 hdr_len = 8 * (dest_hdr->ip6d_len + 1);
3391 3391 prev_nexthdr = dest_hdr->ip6d_nxt;
3392 3392 prev_nexthdr_offset = (uint8_t *)&dest_hdr->ip6d_nxt
3393 3393 - (uint8_t *)ip6h;
3394 3394 ptr += hdr_len;
3395 3395 }
3396 3396 if (prev_nexthdr == IPPROTO_ROUTING) {
3397 3397 ip6_rthdr_t *rthdr;
3398 3398 uint_t hdr_len;
3399 3399
3400 3400 rthdr = (ip6_rthdr_t *)ptr;
3401 3401 prev_nexthdr = rthdr->ip6r_nxt;
3402 3402 prev_nexthdr_offset = (uint8_t *)&rthdr->ip6r_nxt
3403 3403 - (uint8_t *)ip6h;
3404 3404 hdr_len = 8 * (rthdr->ip6r_len + 1);
3405 3405 ptr += hdr_len;
3406 3406 }
3407 3407 if (prev_nexthdr != IPPROTO_FRAGMENT) {
3408 3408 /* Can't handle other headers before the fragment header */
3409 3409 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInHdrErrors);
3410 3410 ip_drop_input("ipIfStatsInHdrErrors", mp, ill);
3411 3411 freemsg(mp);
3412 3412 return (NULL);
3413 3413 }
3414 3414
3415 3415 /*
3416 3416 * Note: Fragment offset in header is in 8-octet units.
3417 3417 * Clearing least significant 3 bits not only extracts
3418 3418 * it but also gets it in units of octets.
3419 3419 */
3420 3420 offset = ntohs(fraghdr->ip6f_offlg) & ~7;
3421 3421 more_frags = (fraghdr->ip6f_offlg & IP6F_MORE_FRAG);
3422 3422
3423 3423 /*
3424 3424 * Is the more frags flag on and the payload length not a multiple
3425 3425 * of eight?
3426 3426 */
3427 3427 if (more_frags && (ntohs(ip6h->ip6_plen) & 7)) {
3428 3428 ip_drop_input("ICMP_PARAM_PROBLEM", mp, ill);
3429 3429 icmp_param_problem_v6(mp, ICMP6_PARAMPROB_HEADER,
3430 3430 (uint32_t)((char *)&ip6h->ip6_plen -
3431 3431 (char *)ip6h), B_FALSE, ira);
3432 3432 return (NULL);
3433 3433 }
3434 3434
3435 3435 v6src_ptr = &ip6h->ip6_src;
3436 3436 v6dst_ptr = &ip6h->ip6_dst;
3437 3437 end = remlen;
3438 3438
3439 3439 hdr_length = (uint_t)((char *)&fraghdr[1] - (char *)ip6h);
3440 3440 end += offset;
3441 3441
3442 3442 /*
3443 3443 * Would fragment cause reassembled packet to have a payload length
3444 3444 * greater than IP_MAXPACKET - the max payload size?
3445 3445 */
3446 3446 if (end > IP_MAXPACKET) {
3447 3447 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInHdrErrors);
3448 3448 ip_drop_input("Reassembled packet too large", mp, ill);
3449 3449 icmp_param_problem_v6(mp, ICMP6_PARAMPROB_HEADER,
3450 3450 (uint32_t)((char *)&fraghdr->ip6f_offlg -
3451 3451 (char *)ip6h), B_FALSE, ira);
3452 3452 return (NULL);
3453 3453 }
3454 3454
3455 3455 /*
3456 3456 * This packet just has one fragment. Reassembly not
3457 3457 * needed.
3458 3458 */
3459 3459 if (!more_frags && offset == 0) {
3460 3460 goto reass_done;
3461 3461 }
3462 3462
3463 3463 /*
3464 3464 * Drop the fragmented as early as possible, if
3465 3465 * we don't have resource(s) to re-assemble.
3466 3466 */
3467 3467 if (ipst->ips_ip_reass_queue_bytes == 0) {
3468 3468 freemsg(mp);
3469 3469 return (NULL);
3470 3470 }
3471 3471
3472 3472 /* Record the ECN field info. */
3473 3473 ecn_info = (uint8_t)(ntohl(ip6h->ip6_vcf & htonl(~0xFFCFFFFF)) >> 20);
3474 3474 /*
3475 3475 * If this is not the first fragment, dump the unfragmentable
3476 3476 * portion of the packet.
3477 3477 */
3478 3478 if (offset)
3479 3479 mp->b_rptr = (uchar_t *)&fraghdr[1];
3480 3480
3481 3481 /*
3482 3482 * Fragmentation reassembly. Each ILL has a hash table for
3483 3483 * queueing packets undergoing reassembly for all IPIFs
3484 3484 * associated with the ILL. The hash is based on the packet
3485 3485 * IP ident field. The ILL frag hash table was allocated
3486 3486 * as a timer block at the time the ILL was created. Whenever
3487 3487 * there is anything on the reassembly queue, the timer will
3488 3488 * be running.
3489 3489 */
3490 3490 /* Handle vnic loopback of fragments */
3491 3491 if (mp->b_datap->db_ref > 2)
3492 3492 msg_len = 0;
3493 3493 else
3494 3494 msg_len = MBLKSIZE(mp);
3495 3495
3496 3496 tail_mp = mp;
3497 3497 while (tail_mp->b_cont != NULL) {
3498 3498 tail_mp = tail_mp->b_cont;
3499 3499 if (tail_mp->b_datap->db_ref <= 2)
3500 3500 msg_len += MBLKSIZE(tail_mp);
3501 3501 }
3502 3502 /*
3503 3503 * If the reassembly list for this ILL will get too big
3504 3504 * prune it.
3505 3505 */
3506 3506
3507 3507 if ((msg_len + sizeof (*ipf) + ill->ill_frag_count) >=
3508 3508 ipst->ips_ip_reass_queue_bytes) {
3509 3509 DTRACE_PROBE3(ip_reass_queue_bytes, uint_t, msg_len,
3510 3510 uint_t, ill->ill_frag_count,
3511 3511 uint_t, ipst->ips_ip_reass_queue_bytes);
3512 3512 ill_frag_prune(ill,
3513 3513 (ipst->ips_ip_reass_queue_bytes < msg_len) ? 0 :
3514 3514 (ipst->ips_ip_reass_queue_bytes - msg_len));
3515 3515 pruned = B_TRUE;
3516 3516 }
3517 3517
3518 3518 ipfb = &ill->ill_frag_hash_tbl[ILL_FRAG_HASH_V6(*v6src_ptr, ident)];
3519 3519 mutex_enter(&ipfb->ipfb_lock);
3520 3520
3521 3521 ipfp = &ipfb->ipfb_ipf;
3522 3522 /* Try to find an existing fragment queue for this packet. */
3523 3523 for (;;) {
3524 3524 ipf = ipfp[0];
3525 3525 if (ipf) {
3526 3526 /*
3527 3527 * It has to match on ident, source address, and
3528 3528 * dest address.
3529 3529 */
3530 3530 if (ipf->ipf_ident == ident &&
3531 3531 IN6_ARE_ADDR_EQUAL(&ipf->ipf_v6src, v6src_ptr) &&
3532 3532 IN6_ARE_ADDR_EQUAL(&ipf->ipf_v6dst, v6dst_ptr)) {
3533 3533
3534 3534 /*
3535 3535 * If we have received too many
3536 3536 * duplicate fragments for this packet
3537 3537 * free it.
3538 3538 */
3539 3539 if (ipf->ipf_num_dups > ip_max_frag_dups) {
3540 3540 ill_frag_free_pkts(ill, ipfb, ipf, 1);
3541 3541 freemsg(mp);
3542 3542 mutex_exit(&ipfb->ipfb_lock);
3543 3543 return (NULL);
3544 3544 }
3545 3545
3546 3546 break;
3547 3547 }
3548 3548 ipfp = &ipf->ipf_hash_next;
3549 3549 continue;
3550 3550 }
3551 3551
3552 3552
3553 3553 /*
3554 3554 * If we pruned the list, do we want to store this new
3555 3555 * fragment?. We apply an optimization here based on the
3556 3556 * fact that most fragments will be received in order.
3557 3557 * So if the offset of this incoming fragment is zero,
3558 3558 * it is the first fragment of a new packet. We will
3559 3559 * keep it. Otherwise drop the fragment, as we have
3560 3560 * probably pruned the packet already (since the
3561 3561 * packet cannot be found).
3562 3562 */
3563 3563
3564 3564 if (pruned && offset != 0) {
3565 3565 mutex_exit(&ipfb->ipfb_lock);
3566 3566 freemsg(mp);
3567 3567 return (NULL);
3568 3568 }
3569 3569
3570 3570 /* New guy. Allocate a frag message. */
3571 3571 mp1 = allocb(sizeof (*ipf), BPRI_MED);
3572 3572 if (!mp1) {
3573 3573 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
3574 3574 ip_drop_input("ipIfStatsInDiscards", mp, ill);
3575 3575 freemsg(mp);
3576 3576 partial_reass_done:
3577 3577 mutex_exit(&ipfb->ipfb_lock);
3578 3578 return (NULL);
3579 3579 }
3580 3580
3581 3581 if (ipfb->ipfb_frag_pkts >= MAX_FRAG_PKTS(ipst)) {
3582 3582 /*
3583 3583 * Too many fragmented packets in this hash bucket.
3584 3584 * Free the oldest.
3585 3585 */
3586 3586 ill_frag_free_pkts(ill, ipfb, ipfb->ipfb_ipf, 1);
3587 3587 }
3588 3588
3589 3589 mp1->b_cont = mp;
3590 3590
3591 3591 /* Initialize the fragment header. */
3592 3592 ipf = (ipf_t *)mp1->b_rptr;
3593 3593 ipf->ipf_mp = mp1;
3594 3594 ipf->ipf_ptphn = ipfp;
3595 3595 ipfp[0] = ipf;
3596 3596 ipf->ipf_hash_next = NULL;
3597 3597 ipf->ipf_ident = ident;
3598 3598 ipf->ipf_v6src = *v6src_ptr;
3599 3599 ipf->ipf_v6dst = *v6dst_ptr;
3600 3600 /* Record reassembly start time. */
3601 3601 ipf->ipf_timestamp = gethrestime_sec();
3602 3602 /* Record ipf generation and account for frag header */
3603 3603 ipf->ipf_gen = ill->ill_ipf_gen++;
3604 3604 ipf->ipf_count = MBLKSIZE(mp1);
3605 3605 ipf->ipf_protocol = nexthdr;
3606 3606 ipf->ipf_nf_hdr_len = 0;
3607 3607 ipf->ipf_prev_nexthdr_offset = 0;
3608 3608 ipf->ipf_last_frag_seen = B_FALSE;
3609 3609 ipf->ipf_ecn = ecn_info;
3610 3610 ipf->ipf_num_dups = 0;
3611 3611 ipfb->ipfb_frag_pkts++;
3612 3612 ipf->ipf_checksum = 0;
3613 3613 ipf->ipf_checksum_flags = 0;
3614 3614
3615 3615 /* Store checksum value in fragment header */
3616 3616 if (sum_flags != 0) {
3617 3617 sum_val = (sum_val & 0xFFFF) + (sum_val >> 16);
3618 3618 sum_val = (sum_val & 0xFFFF) + (sum_val >> 16);
3619 3619 ipf->ipf_checksum = sum_val;
3620 3620 ipf->ipf_checksum_flags = sum_flags;
3621 3621 }
3622 3622
3623 3623 /*
3624 3624 * We handle reassembly two ways. In the easy case,
3625 3625 * where all the fragments show up in order, we do
3626 3626 * minimal bookkeeping, and just clip new pieces on
3627 3627 * the end. If we ever see a hole, then we go off
3628 3628 * to ip_reassemble which has to mark the pieces and
3629 3629 * keep track of the number of holes, etc. Obviously,
3630 3630 * the point of having both mechanisms is so we can
3631 3631 * handle the easy case as efficiently as possible.
3632 3632 */
3633 3633 if (offset == 0) {
3634 3634 /* Easy case, in-order reassembly so far. */
3635 3635 /* Update the byte count */
3636 3636 ipf->ipf_count += msg_len;
3637 3637 ipf->ipf_tail_mp = tail_mp;
3638 3638 /*
3639 3639 * Keep track of next expected offset in
3640 3640 * ipf_end.
3641 3641 */
3642 3642 ipf->ipf_end = end;
3643 3643 ipf->ipf_nf_hdr_len = hdr_length;
3644 3644 ipf->ipf_prev_nexthdr_offset = prev_nexthdr_offset;
3645 3645 } else {
3646 3646 /* Hard case, hole at the beginning. */
3647 3647 ipf->ipf_tail_mp = NULL;
3648 3648 /*
3649 3649 * ipf_end == 0 means that we have given up
3650 3650 * on easy reassembly.
3651 3651 */
3652 3652 ipf->ipf_end = 0;
3653 3653
3654 3654 /* Forget checksum offload from now on */
3655 3655 ipf->ipf_checksum_flags = 0;
3656 3656
3657 3657 /*
3658 3658 * ipf_hole_cnt is set by ip_reassemble.
3659 3659 * ipf_count is updated by ip_reassemble.
3660 3660 * No need to check for return value here
3661 3661 * as we don't expect reassembly to complete or
3662 3662 * fail for the first fragment itself.
3663 3663 */
3664 3664 (void) ip_reassemble(mp, ipf, offset, more_frags, ill,
3665 3665 msg_len);
3666 3666 }
3667 3667 /* Update per ipfb and ill byte counts */
3668 3668 ipfb->ipfb_count += ipf->ipf_count;
3669 3669 ASSERT(ipfb->ipfb_count > 0); /* Wraparound */
3670 3670 atomic_add_32(&ill->ill_frag_count, ipf->ipf_count);
3671 3671 /* If the frag timer wasn't already going, start it. */
3672 3672 mutex_enter(&ill->ill_lock);
3673 3673 ill_frag_timer_start(ill);
3674 3674 mutex_exit(&ill->ill_lock);
3675 3675 goto partial_reass_done;
3676 3676 }
3677 3677
3678 3678 /*
3679 3679 * If the packet's flag has changed (it could be coming up
3680 3680 * from an interface different than the previous, therefore
3681 3681 * possibly different checksum capability), then forget about
3682 3682 * any stored checksum states. Otherwise add the value to
3683 3683 * the existing one stored in the fragment header.
3684 3684 */
3685 3685 if (sum_flags != 0 && sum_flags == ipf->ipf_checksum_flags) {
3686 3686 sum_val += ipf->ipf_checksum;
3687 3687 sum_val = (sum_val & 0xFFFF) + (sum_val >> 16);
3688 3688 sum_val = (sum_val & 0xFFFF) + (sum_val >> 16);
3689 3689 ipf->ipf_checksum = sum_val;
3690 3690 } else if (ipf->ipf_checksum_flags != 0) {
3691 3691 /* Forget checksum offload from now on */
3692 3692 ipf->ipf_checksum_flags = 0;
3693 3693 }
3694 3694
3695 3695 /*
3696 3696 * We have a new piece of a datagram which is already being
3697 3697 * reassembled. Update the ECN info if all IP fragments
3698 3698 * are ECN capable. If there is one which is not, clear
3699 3699 * all the info. If there is at least one which has CE
3700 3700 * code point, IP needs to report that up to transport.
3701 3701 */
3702 3702 if (ecn_info != IPH_ECN_NECT && ipf->ipf_ecn != IPH_ECN_NECT) {
3703 3703 if (ecn_info == IPH_ECN_CE)
3704 3704 ipf->ipf_ecn = IPH_ECN_CE;
3705 3705 } else {
3706 3706 ipf->ipf_ecn = IPH_ECN_NECT;
3707 3707 }
3708 3708
3709 3709 if (offset && ipf->ipf_end == offset) {
3710 3710 /* The new fragment fits at the end */
3711 3711 ipf->ipf_tail_mp->b_cont = mp;
3712 3712 /* Update the byte count */
3713 3713 ipf->ipf_count += msg_len;
3714 3714 /* Update per ipfb and ill byte counts */
3715 3715 ipfb->ipfb_count += msg_len;
3716 3716 ASSERT(ipfb->ipfb_count > 0); /* Wraparound */
3717 3717 atomic_add_32(&ill->ill_frag_count, msg_len);
3718 3718 if (more_frags) {
3719 3719 /* More to come. */
3720 3720 ipf->ipf_end = end;
3721 3721 ipf->ipf_tail_mp = tail_mp;
3722 3722 goto partial_reass_done;
3723 3723 }
3724 3724 } else {
3725 3725 /*
3726 3726 * Go do the hard cases.
3727 3727 * Call ip_reassemble().
3728 3728 */
3729 3729 int ret;
3730 3730
3731 3731 if (offset == 0) {
3732 3732 if (ipf->ipf_prev_nexthdr_offset == 0) {
3733 3733 ipf->ipf_nf_hdr_len = hdr_length;
3734 3734 ipf->ipf_prev_nexthdr_offset =
3735 3735 prev_nexthdr_offset;
3736 3736 }
3737 3737 }
3738 3738 /* Save current byte count */
3739 3739 count = ipf->ipf_count;
3740 3740 ret = ip_reassemble(mp, ipf, offset, more_frags, ill, msg_len);
3741 3741
3742 3742 /* Count of bytes added and subtracted (freeb()ed) */
3743 3743 count = ipf->ipf_count - count;
3744 3744 if (count) {
3745 3745 /* Update per ipfb and ill byte counts */
3746 3746 ipfb->ipfb_count += count;
3747 3747 ASSERT(ipfb->ipfb_count > 0); /* Wraparound */
3748 3748 atomic_add_32(&ill->ill_frag_count, count);
3749 3749 }
3750 3750 if (ret == IP_REASS_PARTIAL) {
3751 3751 goto partial_reass_done;
3752 3752 } else if (ret == IP_REASS_FAILED) {
3753 3753 /* Reassembly failed. Free up all resources */
3754 3754 ill_frag_free_pkts(ill, ipfb, ipf, 1);
3755 3755 for (t_mp = mp; t_mp != NULL; t_mp = t_mp->b_cont) {
3756 3756 IP_REASS_SET_START(t_mp, 0);
3757 3757 IP_REASS_SET_END(t_mp, 0);
3758 3758 }
3759 3759 freemsg(mp);
3760 3760 goto partial_reass_done;
3761 3761 }
3762 3762
3763 3763 /* We will reach here iff 'ret' is IP_REASS_COMPLETE */
3764 3764 }
3765 3765 /*
3766 3766 * We have completed reassembly. Unhook the frag header from
3767 3767 * the reassembly list.
3768 3768 *
3769 3769 * Grab the unfragmentable header length next header value out
3770 3770 * of the first fragment
3771 3771 */
3772 3772 ASSERT(ipf->ipf_nf_hdr_len != 0);
3773 3773 hdr_length = ipf->ipf_nf_hdr_len;
3774 3774
3775 3775 /*
3776 3776 * Before we free the frag header, record the ECN info
3777 3777 * to report back to the transport.
3778 3778 */
3779 3779 ecn_info = ipf->ipf_ecn;
3780 3780
3781 3781 /*
3782 3782 * Store the nextheader field in the header preceding the fragment
3783 3783 * header
3784 3784 */
3785 3785 nexthdr = ipf->ipf_protocol;
3786 3786 prev_nexthdr_offset = ipf->ipf_prev_nexthdr_offset;
3787 3787 ipfp = ipf->ipf_ptphn;
3788 3788
3789 3789 /* We need to supply these to caller */
3790 3790 if ((sum_flags = ipf->ipf_checksum_flags) != 0)
3791 3791 sum_val = ipf->ipf_checksum;
3792 3792 else
3793 3793 sum_val = 0;
3794 3794
3795 3795 mp1 = ipf->ipf_mp;
3796 3796 count = ipf->ipf_count;
3797 3797 ipf = ipf->ipf_hash_next;
3798 3798 if (ipf)
3799 3799 ipf->ipf_ptphn = ipfp;
3800 3800 ipfp[0] = ipf;
3801 3801 atomic_add_32(&ill->ill_frag_count, -count);
3802 3802 ASSERT(ipfb->ipfb_count >= count);
3803 3803 ipfb->ipfb_count -= count;
3804 3804 ipfb->ipfb_frag_pkts--;
3805 3805 mutex_exit(&ipfb->ipfb_lock);
3806 3806 /* Ditch the frag header. */
3807 3807 mp = mp1->b_cont;
3808 3808 freeb(mp1);
3809 3809
3810 3810 /*
3811 3811 * Make sure the packet is good by doing some sanity
3812 3812 * check. If bad we can silentely drop the packet.
3813 3813 */
3814 3814 reass_done:
3815 3815 if (hdr_length < sizeof (ip6_frag_t)) {
3816 3816 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInHdrErrors);
3817 3817 ip_drop_input("ipIfStatsInHdrErrors", mp, ill);
3818 3818 ip1dbg(("ip_input_fragment_v6: bad packet\n"));
3819 3819 freemsg(mp);
3820 3820 return (NULL);
3821 3821 }
3822 3822
3823 3823 /*
3824 3824 * Remove the fragment header from the initial header by
3825 3825 * splitting the mblk into the non-fragmentable header and
3826 3826 * everthing after the fragment extension header. This has the
3827 3827 * side effect of putting all the headers that need destination
3828 3828 * processing into the b_cont block-- on return this fact is
3829 3829 * used in order to avoid having to look at the extensions
3830 3830 * already processed.
3831 3831 *
3832 3832 * Note that this code assumes that the unfragmentable portion
3833 3833 * of the header is in the first mblk and increments
3834 3834 * the read pointer past it. If this assumption is broken
3835 3835 * this code fails badly.
3836 3836 */
3837 3837 if (mp->b_rptr + hdr_length != mp->b_wptr) {
3838 3838 mblk_t *nmp;
3839 3839
3840 3840 if (!(nmp = dupb(mp))) {
3841 3841 ip1dbg(("ip_input_fragment_v6: dupb failed\n"));
3842 3842 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
3843 3843 ip_drop_input("ipIfStatsInDiscards", mp, ill);
3844 3844 freemsg(mp);
3845 3845 return (NULL);
3846 3846 }
3847 3847 nmp->b_cont = mp->b_cont;
3848 3848 mp->b_cont = nmp;
3849 3849 nmp->b_rptr += hdr_length;
3850 3850 }
3851 3851 mp->b_wptr = mp->b_rptr + hdr_length - sizeof (ip6_frag_t);
3852 3852
3853 3853 ip6h = (ip6_t *)mp->b_rptr;
3854 3854 ((char *)ip6h)[prev_nexthdr_offset] = nexthdr;
3855 3855
3856 3856 /* Restore original IP length in header. */
3857 3857 packet_size = msgdsize(mp);
3858 3858 ip6h->ip6_plen = htons((uint16_t)(packet_size - IPV6_HDR_LEN));
3859 3859 /* Record the ECN info. */
3860 3860 ip6h->ip6_vcf &= htonl(0xFFCFFFFF);
3861 3861 ip6h->ip6_vcf |= htonl(ecn_info << 20);
3862 3862
3863 3863 /* Update the receive attributes */
3864 3864 ira->ira_pktlen = packet_size;
3865 3865 ira->ira_ip_hdr_length = hdr_length - sizeof (ip6_frag_t);
3866 3866 ira->ira_protocol = nexthdr;
3867 3867
3868 3868 /* Reassembly is successful; set checksum information in packet */
3869 3869 DB_CKSUM16(mp) = (uint16_t)sum_val;
3870 3870 DB_CKSUMFLAGS(mp) = sum_flags;
3871 3871 DB_CKSUMSTART(mp) = ira->ira_ip_hdr_length;
3872 3872
3873 3873 return (mp);
3874 3874 }
3875 3875
3876 3876 /*
3877 3877 * Given an mblk and a ptr, find the destination address in an IPv6 routing
3878 3878 * header.
3879 3879 */
3880 3880 static in6_addr_t
3881 3881 pluck_out_dst(const mblk_t *mp, uint8_t *whereptr, in6_addr_t oldrv)
3882 3882 {
3883 3883 ip6_rthdr0_t *rt0;
3884 3884 int segleft, numaddr;
3885 3885 in6_addr_t *ap, rv = oldrv;
3886 3886
3887 3887 rt0 = (ip6_rthdr0_t *)whereptr;
3888 3888 if (rt0->ip6r0_type != 0 && rt0->ip6r0_type != 2) {
3889 3889 DTRACE_PROBE2(pluck_out_dst_unknown_type, mblk_t *, mp,
3890 3890 uint8_t *, whereptr);
3891 3891 return (rv);
3892 3892 }
3893 3893 segleft = rt0->ip6r0_segleft;
3894 3894 numaddr = rt0->ip6r0_len / 2;
3895 3895
3896 3896 if ((rt0->ip6r0_len & 0x1) ||
3897 3897 (mp != NULL && whereptr + (rt0->ip6r0_len + 1) * 8 > mp->b_wptr) ||
3898 3898 (segleft > rt0->ip6r0_len / 2)) {
3899 3899 /*
3900 3900 * Corrupt packet. Either the routing header length is odd
3901 3901 * (can't happen) or mismatched compared to the packet, or the
3902 3902 * number of addresses is. Return what we can. This will
3903 3903 * only be a problem on forwarded packets that get squeezed
3904 3904 * through an outbound tunnel enforcing IPsec Tunnel Mode.
3905 3905 */
3906 3906 DTRACE_PROBE2(pluck_out_dst_badpkt, mblk_t *, mp, uint8_t *,
3907 3907 whereptr);
3908 3908 return (rv);
3909 3909 }
3910 3910
3911 3911 if (segleft != 0) {
3912 3912 ap = (in6_addr_t *)((char *)rt0 + sizeof (*rt0));
3913 3913 rv = ap[numaddr - 1];
3914 3914 }
3915 3915
3916 3916 return (rv);
3917 3917 }
3918 3918
3919 3919 /*
3920 3920 * Walk through the options to see if there is a routing header.
3921 3921 * If present get the destination which is the last address of
3922 3922 * the option.
3923 3923 * mp needs to be provided in cases when the extension headers might span
3924 3924 * b_cont; mp is never modified by this function.
3925 3925 */
3926 3926 in6_addr_t
3927 3927 ip_get_dst_v6(ip6_t *ip6h, const mblk_t *mp, boolean_t *is_fragment)
3928 3928 {
3929 3929 const mblk_t *current_mp = mp;
3930 3930 uint8_t nexthdr;
3931 3931 uint8_t *whereptr;
3932 3932 int ehdrlen;
3933 3933 in6_addr_t rv;
3934 3934
3935 3935 whereptr = (uint8_t *)ip6h;
3936 3936 ehdrlen = sizeof (ip6_t);
3937 3937
3938 3938 /* We assume at least the IPv6 base header is within one mblk. */
3939 3939 ASSERT(mp == NULL ||
3940 3940 (mp->b_rptr <= whereptr && mp->b_wptr >= whereptr + ehdrlen));
3941 3941
3942 3942 rv = ip6h->ip6_dst;
3943 3943 nexthdr = ip6h->ip6_nxt;
3944 3944 if (is_fragment != NULL)
3945 3945 *is_fragment = B_FALSE;
3946 3946
3947 3947 /*
3948 3948 * We also assume (thanks to ipsec_tun_outbound()'s pullup) that
3949 3949 * no extension headers will be split across mblks.
3950 3950 */
3951 3951
3952 3952 while (nexthdr == IPPROTO_HOPOPTS || nexthdr == IPPROTO_DSTOPTS ||
3953 3953 nexthdr == IPPROTO_ROUTING) {
3954 3954 if (nexthdr == IPPROTO_ROUTING)
3955 3955 rv = pluck_out_dst(current_mp, whereptr, rv);
3956 3956
3957 3957 /*
3958 3958 * All IPv6 extension headers have the next-header in byte
3959 3959 * 0, and the (length - 8) in 8-byte-words.
3960 3960 */
3961 3961 while (current_mp != NULL &&
3962 3962 whereptr + ehdrlen >= current_mp->b_wptr) {
3963 3963 ehdrlen -= (current_mp->b_wptr - whereptr);
3964 3964 current_mp = current_mp->b_cont;
3965 3965 if (current_mp == NULL) {
3966 3966 /* Bad packet. Return what we can. */
3967 3967 DTRACE_PROBE3(ip_get_dst_v6_badpkt, mblk_t *,
3968 3968 mp, mblk_t *, current_mp, ip6_t *, ip6h);
3969 3969 goto done;
3970 3970 }
3971 3971 whereptr = current_mp->b_rptr;
3972 3972 }
3973 3973 whereptr += ehdrlen;
3974 3974
3975 3975 nexthdr = *whereptr;
3976 3976 ASSERT(current_mp == NULL || whereptr + 1 < current_mp->b_wptr);
3977 3977 ehdrlen = (*(whereptr + 1) + 1) * 8;
3978 3978 }
3979 3979
3980 3980 done:
3981 3981 if (nexthdr == IPPROTO_FRAGMENT && is_fragment != NULL)
3982 3982 *is_fragment = B_TRUE;
3983 3983 return (rv);
3984 3984 }
3985 3985
3986 3986 /*
3987 3987 * ip_source_routed_v6:
3988 3988 * This function is called by redirect code (called from ip_input_v6) to
3989 3989 * know whether this packet is source routed through this node i.e
3990 3990 * whether this node (router) is part of the journey. This
3991 3991 * function is called under two cases :
3992 3992 *
3993 3993 * case 1 : Routing header was processed by this node and
3994 3994 * ip_process_rthdr replaced ip6_dst with the next hop
3995 3995 * and we are forwarding the packet to the next hop.
3996 3996 *
3997 3997 * case 2 : Routing header was not processed by this node and we
3998 3998 * are just forwarding the packet.
3999 3999 *
4000 4000 * For case (1) we don't want to send redirects. For case(2) we
4001 4001 * want to send redirects.
4002 4002 */
4003 4003 static boolean_t
4004 4004 ip_source_routed_v6(ip6_t *ip6h, mblk_t *mp, ip_stack_t *ipst)
4005 4005 {
4006 4006 uint8_t nexthdr;
4007 4007 in6_addr_t *addrptr;
4008 4008 ip6_rthdr0_t *rthdr;
4009 4009 uint8_t numaddr;
4010 4010 ip6_hbh_t *hbhhdr;
4011 4011 uint_t ehdrlen;
4012 4012 uint8_t *byteptr;
4013 4013
4014 4014 ip2dbg(("ip_source_routed_v6\n"));
4015 4015 nexthdr = ip6h->ip6_nxt;
4016 4016 ehdrlen = IPV6_HDR_LEN;
4017 4017
4018 4018 /* if a routing hdr is preceeded by HOPOPT or DSTOPT */
4019 4019 while (nexthdr == IPPROTO_HOPOPTS ||
4020 4020 nexthdr == IPPROTO_DSTOPTS) {
4021 4021 byteptr = (uint8_t *)ip6h + ehdrlen;
4022 4022 /*
4023 4023 * Check if we have already processed
4024 4024 * packets or we are just a forwarding
4025 4025 * router which only pulled up msgs up
4026 4026 * to IPV6HDR and one HBH ext header
4027 4027 */
4028 4028 if (byteptr + MIN_EHDR_LEN > mp->b_wptr) {
4029 4029 ip2dbg(("ip_source_routed_v6: Extension"
4030 4030 " headers not processed\n"));
4031 4031 return (B_FALSE);
4032 4032 }
4033 4033 hbhhdr = (ip6_hbh_t *)byteptr;
4034 4034 nexthdr = hbhhdr->ip6h_nxt;
4035 4035 ehdrlen = ehdrlen + 8 * (hbhhdr->ip6h_len + 1);
4036 4036 }
4037 4037 switch (nexthdr) {
4038 4038 case IPPROTO_ROUTING:
4039 4039 byteptr = (uint8_t *)ip6h + ehdrlen;
4040 4040 /*
4041 4041 * If for some reason, we haven't pulled up
4042 4042 * the routing hdr data mblk, then we must
4043 4043 * not have processed it at all. So for sure
4044 4044 * we are not part of the source routed journey.
4045 4045 */
4046 4046 if (byteptr + MIN_EHDR_LEN > mp->b_wptr) {
4047 4047 ip2dbg(("ip_source_routed_v6: Routing"
4048 4048 " header not processed\n"));
4049 4049 return (B_FALSE);
4050 4050 }
4051 4051 rthdr = (ip6_rthdr0_t *)byteptr;
4052 4052 /*
4053 4053 * Either we are an intermediate router or the
4054 4054 * last hop before destination and we have
4055 4055 * already processed the routing header.
4056 4056 * If segment_left is greater than or equal to zero,
4057 4057 * then we must be the (numaddr - segleft) entry
4058 4058 * of the routing header. Although ip6r0_segleft
4059 4059 * is a unit8_t variable, we still check for zero
4060 4060 * or greater value, if in case the data type
4061 4061 * is changed someday in future.
4062 4062 */
4063 4063 if (rthdr->ip6r0_segleft > 0 ||
4064 4064 rthdr->ip6r0_segleft == 0) {
4065 4065 numaddr = rthdr->ip6r0_len / 2;
4066 4066 addrptr = (in6_addr_t *)((char *)rthdr +
4067 4067 sizeof (*rthdr));
4068 4068 addrptr += (numaddr - (rthdr->ip6r0_segleft + 1));
4069 4069 if (addrptr != NULL) {
4070 4070 if (ip_type_v6(addrptr, ipst) == IRE_LOCAL)
4071 4071 return (B_TRUE);
4072 4072 ip1dbg(("ip_source_routed_v6: Not local\n"));
4073 4073 }
4074 4074 }
4075 4075 /* FALLTHRU */
4076 4076 default:
4077 4077 ip2dbg(("ip_source_routed_v6: Not source routed here\n"));
4078 4078 return (B_FALSE);
4079 4079 }
4080 4080 }
4081 4081
4082 4082 /*
4083 4083 * IPv6 fragmentation. Essentially the same as IPv4 fragmentation.
4084 4084 * We have not optimized this in terms of number of mblks
4085 4085 * allocated. For instance, for each fragment sent we always allocate a
4086 4086 * mblk to hold the IPv6 header and fragment header.
4087 4087 *
4088 4088 * Assumes that all the extension headers are contained in the first mblk
4089 4089 * and that the fragment header has has already been added by calling
4090 4090 * ip_fraghdr_add_v6.
4091 4091 */
4092 4092 int
4093 4093 ip_fragment_v6(mblk_t *mp, nce_t *nce, iaflags_t ixaflags, uint_t pkt_len,
4094 4094 uint32_t max_frag, uint32_t xmit_hint, zoneid_t szone, zoneid_t nolzid,
4095 4095 pfirepostfrag_t postfragfn, uintptr_t *ixa_cookie)
4096 4096 {
4097 4097 ip6_t *ip6h = (ip6_t *)mp->b_rptr;
4098 4098 ip6_t *fip6h;
4099 4099 mblk_t *hmp;
4100 4100 mblk_t *hmp0;
4101 4101 mblk_t *dmp;
4102 4102 ip6_frag_t *fraghdr;
4103 4103 size_t unfragmentable_len;
4104 4104 size_t mlen;
4105 4105 size_t max_chunk;
4106 4106 uint16_t off_flags;
4107 4107 uint16_t offset = 0;
4108 4108 ill_t *ill = nce->nce_ill;
4109 4109 uint8_t nexthdr;
4110 4110 uint8_t *ptr;
4111 4111 ip_stack_t *ipst = ill->ill_ipst;
4112 4112 uint_t priority = mp->b_band;
4113 4113 int error = 0;
4114 4114
4115 4115 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutFragReqds);
4116 4116 if (max_frag == 0) {
4117 4117 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutFragFails);
4118 4118 ip_drop_output("FragFails: zero max_frag", mp, ill);
4119 4119 freemsg(mp);
4120 4120 return (EINVAL);
4121 4121 }
4122 4122
4123 4123 /*
4124 4124 * Caller should have added fraghdr_t to pkt_len, and also
4125 4125 * updated ip6_plen.
4126 4126 */
4127 4127 ASSERT(ntohs(ip6h->ip6_plen) + IPV6_HDR_LEN == pkt_len);
4128 4128 ASSERT(msgdsize(mp) == pkt_len);
4129 4129
4130 4130 /*
4131 4131 * Determine the length of the unfragmentable portion of this
4132 4132 * datagram. This consists of the IPv6 header, a potential
4133 4133 * hop-by-hop options header, a potential pre-routing-header
4134 4134 * destination options header, and a potential routing header.
4135 4135 */
4136 4136 nexthdr = ip6h->ip6_nxt;
4137 4137 ptr = (uint8_t *)&ip6h[1];
4138 4138
4139 4139 if (nexthdr == IPPROTO_HOPOPTS) {
4140 4140 ip6_hbh_t *hbh_hdr;
4141 4141 uint_t hdr_len;
4142 4142
4143 4143 hbh_hdr = (ip6_hbh_t *)ptr;
4144 4144 hdr_len = 8 * (hbh_hdr->ip6h_len + 1);
4145 4145 nexthdr = hbh_hdr->ip6h_nxt;
4146 4146 ptr += hdr_len;
4147 4147 }
4148 4148 if (nexthdr == IPPROTO_DSTOPTS) {
4149 4149 ip6_dest_t *dest_hdr;
4150 4150 uint_t hdr_len;
4151 4151
4152 4152 dest_hdr = (ip6_dest_t *)ptr;
4153 4153 if (dest_hdr->ip6d_nxt == IPPROTO_ROUTING) {
4154 4154 hdr_len = 8 * (dest_hdr->ip6d_len + 1);
4155 4155 nexthdr = dest_hdr->ip6d_nxt;
4156 4156 ptr += hdr_len;
4157 4157 }
4158 4158 }
4159 4159 if (nexthdr == IPPROTO_ROUTING) {
4160 4160 ip6_rthdr_t *rthdr;
4161 4161 uint_t hdr_len;
4162 4162
4163 4163 rthdr = (ip6_rthdr_t *)ptr;
4164 4164 nexthdr = rthdr->ip6r_nxt;
4165 4165 hdr_len = 8 * (rthdr->ip6r_len + 1);
4166 4166 ptr += hdr_len;
4167 4167 }
4168 4168 if (nexthdr != IPPROTO_FRAGMENT) {
4169 4169 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutFragFails);
4170 4170 ip_drop_output("FragFails: bad nexthdr", mp, ill);
4171 4171 freemsg(mp);
4172 4172 return (EINVAL);
4173 4173 }
4174 4174 unfragmentable_len = (uint_t)(ptr - (uint8_t *)ip6h);
4175 4175 unfragmentable_len += sizeof (ip6_frag_t);
4176 4176
4177 4177 max_chunk = (max_frag - unfragmentable_len) & ~7;
4178 4178
4179 4179 /*
4180 4180 * Allocate an mblk with enough room for the link-layer
4181 4181 * header and the unfragmentable part of the datagram, which includes
4182 4182 * the fragment header. This (or a copy) will be used as the
4183 4183 * first mblk for each fragment we send.
4184 4184 */
4185 4185 hmp = allocb_tmpl(unfragmentable_len + ipst->ips_ip_wroff_extra, mp);
4186 4186 if (hmp == NULL) {
4187 4187 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutFragFails);
4188 4188 ip_drop_output("FragFails: no hmp", mp, ill);
4189 4189 freemsg(mp);
4190 4190 return (ENOBUFS);
4191 4191 }
4192 4192 hmp->b_rptr += ipst->ips_ip_wroff_extra;
4193 4193 hmp->b_wptr = hmp->b_rptr + unfragmentable_len;
4194 4194
4195 4195 fip6h = (ip6_t *)hmp->b_rptr;
4196 4196 bcopy(ip6h, fip6h, unfragmentable_len);
4197 4197
4198 4198 /*
4199 4199 * pkt_len is set to the total length of the fragmentable data in this
4200 4200 * datagram. For each fragment sent, we will decrement pkt_len
4201 4201 * by the amount of fragmentable data sent in that fragment
4202 4202 * until len reaches zero.
4203 4203 */
4204 4204 pkt_len -= unfragmentable_len;
4205 4205
4206 4206 /*
4207 4207 * Move read ptr past unfragmentable portion, we don't want this part
4208 4208 * of the data in our fragments.
4209 4209 */
4210 4210 mp->b_rptr += unfragmentable_len;
4211 4211 if (mp->b_rptr == mp->b_wptr) {
4212 4212 mblk_t *mp1 = mp->b_cont;
4213 4213 freeb(mp);
4214 4214 mp = mp1;
4215 4215 }
4216 4216
4217 4217 while (pkt_len != 0) {
4218 4218 mlen = MIN(pkt_len, max_chunk);
4219 4219 pkt_len -= mlen;
4220 4220 if (pkt_len != 0) {
4221 4221 /* Not last */
4222 4222 hmp0 = copyb(hmp);
4223 4223 if (hmp0 == NULL) {
4224 4224 BUMP_MIB(ill->ill_ip_mib,
4225 4225 ipIfStatsOutFragFails);
4226 4226 ip_drop_output("FragFails: copyb failed",
4227 4227 mp, ill);
4228 4228 freeb(hmp);
4229 4229 freemsg(mp);
4230 4230 ip1dbg(("ip_fragment_v6: copyb failed\n"));
4231 4231 return (ENOBUFS);
4232 4232 }
4233 4233 off_flags = IP6F_MORE_FRAG;
4234 4234 } else {
4235 4235 /* Last fragment */
4236 4236 hmp0 = hmp;
4237 4237 hmp = NULL;
4238 4238 off_flags = 0;
4239 4239 }
4240 4240 fip6h = (ip6_t *)(hmp0->b_rptr);
4241 4241 fraghdr = (ip6_frag_t *)(hmp0->b_rptr + unfragmentable_len -
4242 4242 sizeof (ip6_frag_t));
4243 4243
4244 4244 fip6h->ip6_plen = htons((uint16_t)(mlen +
4245 4245 unfragmentable_len - IPV6_HDR_LEN));
4246 4246 /*
4247 4247 * Note: Optimization alert.
4248 4248 * In IPv6 (and IPv4) protocol header, Fragment Offset
4249 4249 * ("offset") is 13 bits wide and in 8-octet units.
4250 4250 * In IPv6 protocol header (unlike IPv4) in a 16 bit field,
4251 4251 * it occupies the most significant 13 bits.
4252 4252 * (least significant 13 bits in IPv4).
4253 4253 * We do not do any shifts here. Not shifting is same effect
4254 4254 * as taking offset value in octet units, dividing by 8 and
4255 4255 * then shifting 3 bits left to line it up in place in proper
4256 4256 * place protocol header.
4257 4257 */
4258 4258 fraghdr->ip6f_offlg = htons(offset) | off_flags;
4259 4259
4260 4260 if (!(dmp = ip_carve_mp(&mp, mlen))) {
4261 4261 /* mp has already been freed by ip_carve_mp() */
4262 4262 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutFragFails);
4263 4263 ip_drop_output("FragFails: could not carve mp",
4264 4264 hmp0, ill);
4265 4265 if (hmp != NULL)
4266 4266 freeb(hmp);
4267 4267 freeb(hmp0);
4268 4268 ip1dbg(("ip_carve_mp: failed\n"));
4269 4269 return (ENOBUFS);
4270 4270 }
4271 4271 hmp0->b_cont = dmp;
4272 4272 /* Get the priority marking, if any */
4273 4273 hmp0->b_band = priority;
4274 4274
4275 4275 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutFragCreates);
4276 4276
4277 4277 error = postfragfn(hmp0, nce, ixaflags,
4278 4278 mlen + unfragmentable_len, xmit_hint, szone, nolzid,
4279 4279 ixa_cookie);
4280 4280 if (error != 0 && error != EWOULDBLOCK && hmp != NULL) {
4281 4281 /* No point in sending the other fragments */
4282 4282 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutFragFails);
4283 4283 ip_drop_output("FragFails: postfragfn failed",
4284 4284 hmp, ill);
4285 4285 freeb(hmp);
4286 4286 freemsg(mp);
4287 4287 return (error);
4288 4288 }
4289 4289 /* No need to redo state machine in loop */
4290 4290 ixaflags &= ~IXAF_REACH_CONF;
4291 4291
4292 4292 offset += mlen;
4293 4293 }
4294 4294 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutFragOKs);
4295 4295 return (error);
4296 4296 }
4297 4297
4298 4298 /*
4299 4299 * Add a fragment header to an IPv6 packet.
4300 4300 * Assumes that all the extension headers are contained in the first mblk.
4301 4301 *
4302 4302 * The fragment header is inserted after an hop-by-hop options header
4303 4303 * and after [an optional destinations header followed by] a routing header.
4304 4304 */
4305 4305 mblk_t *
4306 4306 ip_fraghdr_add_v6(mblk_t *mp, uint32_t ident, ip_xmit_attr_t *ixa)
4307 4307 {
4308 4308 ip6_t *ip6h = (ip6_t *)mp->b_rptr;
4309 4309 ip6_t *fip6h;
4310 4310 mblk_t *hmp;
4311 4311 ip6_frag_t *fraghdr;
4312 4312 size_t unfragmentable_len;
4313 4313 uint8_t nexthdr;
4314 4314 uint_t prev_nexthdr_offset;
4315 4315 uint8_t *ptr;
4316 4316 uint_t priority = mp->b_band;
4317 4317 ip_stack_t *ipst = ixa->ixa_ipst;
4318 4318
4319 4319 /*
4320 4320 * Determine the length of the unfragmentable portion of this
4321 4321 * datagram. This consists of the IPv6 header, a potential
4322 4322 * hop-by-hop options header, a potential pre-routing-header
4323 4323 * destination options header, and a potential routing header.
4324 4324 */
4325 4325 nexthdr = ip6h->ip6_nxt;
4326 4326 prev_nexthdr_offset = (uint8_t *)&ip6h->ip6_nxt - (uint8_t *)ip6h;
4327 4327 ptr = (uint8_t *)&ip6h[1];
4328 4328
4329 4329 if (nexthdr == IPPROTO_HOPOPTS) {
4330 4330 ip6_hbh_t *hbh_hdr;
4331 4331 uint_t hdr_len;
4332 4332
4333 4333 hbh_hdr = (ip6_hbh_t *)ptr;
4334 4334 hdr_len = 8 * (hbh_hdr->ip6h_len + 1);
4335 4335 nexthdr = hbh_hdr->ip6h_nxt;
4336 4336 prev_nexthdr_offset = (uint8_t *)&hbh_hdr->ip6h_nxt
4337 4337 - (uint8_t *)ip6h;
4338 4338 ptr += hdr_len;
4339 4339 }
4340 4340 if (nexthdr == IPPROTO_DSTOPTS) {
4341 4341 ip6_dest_t *dest_hdr;
4342 4342 uint_t hdr_len;
4343 4343
4344 4344 dest_hdr = (ip6_dest_t *)ptr;
4345 4345 if (dest_hdr->ip6d_nxt == IPPROTO_ROUTING) {
4346 4346 hdr_len = 8 * (dest_hdr->ip6d_len + 1);
4347 4347 nexthdr = dest_hdr->ip6d_nxt;
4348 4348 prev_nexthdr_offset = (uint8_t *)&dest_hdr->ip6d_nxt
4349 4349 - (uint8_t *)ip6h;
4350 4350 ptr += hdr_len;
4351 4351 }
4352 4352 }
4353 4353 if (nexthdr == IPPROTO_ROUTING) {
4354 4354 ip6_rthdr_t *rthdr;
4355 4355 uint_t hdr_len;
4356 4356
4357 4357 rthdr = (ip6_rthdr_t *)ptr;
4358 4358 nexthdr = rthdr->ip6r_nxt;
4359 4359 prev_nexthdr_offset = (uint8_t *)&rthdr->ip6r_nxt
4360 4360 - (uint8_t *)ip6h;
4361 4361 hdr_len = 8 * (rthdr->ip6r_len + 1);
4362 4362 ptr += hdr_len;
4363 4363 }
4364 4364 unfragmentable_len = (uint_t)(ptr - (uint8_t *)ip6h);
4365 4365
4366 4366 /*
4367 4367 * Allocate an mblk with enough room for the link-layer
4368 4368 * header, the unfragmentable part of the datagram, and the
4369 4369 * fragment header.
4370 4370 */
4371 4371 hmp = allocb_tmpl(unfragmentable_len + sizeof (ip6_frag_t) +
4372 4372 ipst->ips_ip_wroff_extra, mp);
4373 4373 if (hmp == NULL) {
4374 4374 ill_t *ill = ixa->ixa_nce->nce_ill;
4375 4375
4376 4376 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
4377 4377 ip_drop_output("ipIfStatsOutDiscards: allocb failure", mp, ill);
4378 4378 freemsg(mp);
4379 4379 return (NULL);
4380 4380 }
4381 4381 hmp->b_rptr += ipst->ips_ip_wroff_extra;
4382 4382 hmp->b_wptr = hmp->b_rptr + unfragmentable_len + sizeof (ip6_frag_t);
4383 4383
4384 4384 fip6h = (ip6_t *)hmp->b_rptr;
4385 4385 fraghdr = (ip6_frag_t *)(hmp->b_rptr + unfragmentable_len);
4386 4386
4387 4387 bcopy(ip6h, fip6h, unfragmentable_len);
4388 4388 fip6h->ip6_plen = htons(ntohs(fip6h->ip6_plen) + sizeof (ip6_frag_t));
4389 4389 hmp->b_rptr[prev_nexthdr_offset] = IPPROTO_FRAGMENT;
4390 4390
4391 4391 fraghdr->ip6f_nxt = nexthdr;
4392 4392 fraghdr->ip6f_reserved = 0;
4393 4393 fraghdr->ip6f_offlg = 0;
4394 4394 fraghdr->ip6f_ident = htonl(ident);
4395 4395
4396 4396 /* Get the priority marking, if any */
4397 4397 hmp->b_band = priority;
4398 4398
4399 4399 /*
4400 4400 * Move read ptr past unfragmentable portion, we don't want this part
4401 4401 * of the data in our fragments.
4402 4402 */
4403 4403 mp->b_rptr += unfragmentable_len;
4404 4404 hmp->b_cont = mp;
4405 4405 return (hmp);
4406 4406 }
4407 4407
4408 4408 /*
4409 4409 * Determine if the ill and multicast aspects of that packets
4410 4410 * "matches" the conn.
4411 4411 */
4412 4412 boolean_t
4413 4413 conn_wantpacket_v6(conn_t *connp, ip_recv_attr_t *ira, ip6_t *ip6h)
4414 4414 {
4415 4415 ill_t *ill = ira->ira_rill;
4416 4416 zoneid_t zoneid = ira->ira_zoneid;
4417 4417 uint_t in_ifindex;
4418 4418 in6_addr_t *v6dst_ptr = &ip6h->ip6_dst;
4419 4419 in6_addr_t *v6src_ptr = &ip6h->ip6_src;
4420 4420
4421 4421 /*
4422 4422 * conn_incoming_ifindex is set by IPV6_BOUND_IF and as link-local
4423 4423 * scopeid. This is used to limit
4424 4424 * unicast and multicast reception to conn_incoming_ifindex.
4425 4425 * conn_wantpacket_v6 is called both for unicast and
4426 4426 * multicast packets.
4427 4427 */
4428 4428 in_ifindex = connp->conn_incoming_ifindex;
4429 4429
4430 4430 /* mpathd can bind to the under IPMP interface, which we allow */
4431 4431 if (in_ifindex != 0 && in_ifindex != ill->ill_phyint->phyint_ifindex) {
4432 4432 if (!IS_UNDER_IPMP(ill))
4433 4433 return (B_FALSE);
4434 4434
4435 4435 if (in_ifindex != ipmp_ill_get_ipmp_ifindex(ill))
4436 4436 return (B_FALSE);
4437 4437 }
4438 4438
4439 4439 if (!IPCL_ZONE_MATCH(connp, zoneid))
4440 4440 return (B_FALSE);
4441 4441
4442 4442 if (!(ira->ira_flags & IRAF_MULTICAST))
4443 4443 return (B_TRUE);
4444 4444
4445 4445 if (connp->conn_multi_router)
4446 4446 return (B_TRUE);
4447 4447
4448 4448 if (ira->ira_protocol == IPPROTO_RSVP)
4449 4449 return (B_TRUE);
4450 4450
4451 4451 return (conn_hasmembers_ill_withsrc_v6(connp, v6dst_ptr, v6src_ptr,
4452 4452 ira->ira_ill));
4453 4453 }
4454 4454
4455 4455 /*
4456 4456 * pr_addr_dbg function provides the needed buffer space to call
4457 4457 * inet_ntop() function's 3rd argument. This function should be
4458 4458 * used by any kernel routine which wants to save INET6_ADDRSTRLEN
4459 4459 * stack buffer space in it's own stack frame. This function uses
4460 4460 * a buffer from it's own stack and prints the information.
4461 4461 * Example: pr_addr_dbg("func: no route for %s\n ", AF_INET, addr)
4462 4462 *
4463 4463 * Note: This function can call inet_ntop() once.
4464 4464 */
4465 4465 void
4466 4466 pr_addr_dbg(char *fmt1, int af, const void *addr)
4467 4467 {
4468 4468 char buf[INET6_ADDRSTRLEN];
4469 4469
4470 4470 if (fmt1 == NULL) {
4471 4471 ip0dbg(("pr_addr_dbg: Wrong arguments\n"));
4472 4472 return;
4473 4473 }
4474 4474
4475 4475 /*
4476 4476 * This does not compare debug level and just prints
4477 4477 * out. Thus it is the responsibility of the caller
4478 4478 * to check the appropriate debug-level before calling
4479 4479 * this function.
4480 4480 */
4481 4481 if (ip_debug > 0) {
4482 4482 printf(fmt1, inet_ntop(af, addr, buf, sizeof (buf)));
4483 4483 }
4484 4484
4485 4485
4486 4486 }
4487 4487
4488 4488
4489 4489 /*
4490 4490 * Return the length in bytes of the IPv6 headers (base header
4491 4491 * extension headers) that will be needed based on the
4492 4492 * ip_pkt_t structure passed by the caller.
4493 4493 *
4494 4494 * The returned length does not include the length of the upper level
4495 4495 * protocol (ULP) header.
4496 4496 */
4497 4497 int
4498 4498 ip_total_hdrs_len_v6(const ip_pkt_t *ipp)
4499 4499 {
4500 4500 int len;
4501 4501
4502 4502 len = IPV6_HDR_LEN;
4503 4503
4504 4504 /*
4505 4505 * If there's a security label here, then we ignore any hop-by-hop
4506 4506 * options the user may try to set.
4507 4507 */
4508 4508 if (ipp->ipp_fields & IPPF_LABEL_V6) {
4509 4509 uint_t hopoptslen;
4510 4510 /*
4511 4511 * Note that ipp_label_len_v6 is just the option - not
4512 4512 * the hopopts extension header. It also needs to be padded
4513 4513 * to a multiple of 8 bytes.
4514 4514 */
4515 4515 ASSERT(ipp->ipp_label_len_v6 != 0);
4516 4516 hopoptslen = ipp->ipp_label_len_v6 + sizeof (ip6_hbh_t);
4517 4517 hopoptslen = (hopoptslen + 7)/8 * 8;
4518 4518 len += hopoptslen;
4519 4519 } else if (ipp->ipp_fields & IPPF_HOPOPTS) {
4520 4520 ASSERT(ipp->ipp_hopoptslen != 0);
4521 4521 len += ipp->ipp_hopoptslen;
4522 4522 }
4523 4523
4524 4524 /*
4525 4525 * En-route destination options
4526 4526 * Only do them if there's a routing header as well
4527 4527 */
4528 4528 if ((ipp->ipp_fields & (IPPF_RTHDRDSTOPTS|IPPF_RTHDR)) ==
4529 4529 (IPPF_RTHDRDSTOPTS|IPPF_RTHDR)) {
4530 4530 ASSERT(ipp->ipp_rthdrdstoptslen != 0);
4531 4531 len += ipp->ipp_rthdrdstoptslen;
4532 4532 }
4533 4533 if (ipp->ipp_fields & IPPF_RTHDR) {
4534 4534 ASSERT(ipp->ipp_rthdrlen != 0);
4535 4535 len += ipp->ipp_rthdrlen;
4536 4536 }
4537 4537 if (ipp->ipp_fields & IPPF_DSTOPTS) {
4538 4538 ASSERT(ipp->ipp_dstoptslen != 0);
4539 4539 len += ipp->ipp_dstoptslen;
4540 4540 }
4541 4541 return (len);
4542 4542 }
4543 4543
4544 4544 /*
4545 4545 * All-purpose routine to build a header chain of an IPv6 header
4546 4546 * followed by any required extension headers and a proto header.
4547 4547 *
4548 4548 * The caller has to set the source and destination address as well as
4549 4549 * ip6_plen. The caller has to massage any routing header and compensate
4550 4550 * for the ULP pseudo-header checksum due to the source route.
4551 4551 *
4552 4552 * The extension headers will all be fully filled in.
4553 4553 */
4554 4554 void
4555 4555 ip_build_hdrs_v6(uchar_t *buf, uint_t buf_len, const ip_pkt_t *ipp,
4556 4556 uint8_t protocol, uint32_t flowinfo)
4557 4557 {
4558 4558 uint8_t *nxthdr_ptr;
4559 4559 uint8_t *cp;
4560 4560 ip6_t *ip6h = (ip6_t *)buf;
4561 4561
4562 4562 /* Initialize IPv6 header */
4563 4563 ip6h->ip6_vcf =
4564 4564 (IPV6_DEFAULT_VERS_AND_FLOW & IPV6_VERS_AND_FLOW_MASK) |
4565 4565 (flowinfo & ~IPV6_VERS_AND_FLOW_MASK);
4566 4566
4567 4567 if (ipp->ipp_fields & IPPF_TCLASS) {
4568 4568 /* Overrides the class part of flowinfo */
4569 4569 ip6h->ip6_vcf = IPV6_TCLASS_FLOW(ip6h->ip6_vcf,
4570 4570 ipp->ipp_tclass);
4571 4571 }
4572 4572
4573 4573 if (ipp->ipp_fields & IPPF_HOPLIMIT)
4574 4574 ip6h->ip6_hops = ipp->ipp_hoplimit;
4575 4575 else
4576 4576 ip6h->ip6_hops = ipp->ipp_unicast_hops;
4577 4577
4578 4578 if ((ipp->ipp_fields & IPPF_ADDR) &&
4579 4579 !IN6_IS_ADDR_V4MAPPED(&ipp->ipp_addr))
4580 4580 ip6h->ip6_src = ipp->ipp_addr;
4581 4581
4582 4582 nxthdr_ptr = (uint8_t *)&ip6h->ip6_nxt;
4583 4583 cp = (uint8_t *)&ip6h[1];
4584 4584 /*
4585 4585 * Here's where we have to start stringing together
4586 4586 * any extension headers in the right order:
4587 4587 * Hop-by-hop, destination, routing, and final destination opts.
4588 4588 */
4589 4589 /*
4590 4590 * If there's a security label here, then we ignore any hop-by-hop
4591 4591 * options the user may try to set.
4592 4592 */
4593 4593 if (ipp->ipp_fields & IPPF_LABEL_V6) {
4594 4594 /*
4595 4595 * Hop-by-hop options with the label.
4596 4596 * Note that ipp_label_v6 is just the option - not
4597 4597 * the hopopts extension header. It also needs to be padded
4598 4598 * to a multiple of 8 bytes.
4599 4599 */
4600 4600 ip6_hbh_t *hbh = (ip6_hbh_t *)cp;
4601 4601 uint_t hopoptslen;
4602 4602 uint_t padlen;
4603 4603
4604 4604 padlen = ipp->ipp_label_len_v6 + sizeof (ip6_hbh_t);
4605 4605 hopoptslen = (padlen + 7)/8 * 8;
4606 4606 padlen = hopoptslen - padlen;
4607 4607
4608 4608 *nxthdr_ptr = IPPROTO_HOPOPTS;
4609 4609 nxthdr_ptr = &hbh->ip6h_nxt;
4610 4610 hbh->ip6h_len = hopoptslen/8 - 1;
4611 4611 cp += sizeof (ip6_hbh_t);
4612 4612 bcopy(ipp->ipp_label_v6, cp, ipp->ipp_label_len_v6);
4613 4613 cp += ipp->ipp_label_len_v6;
4614 4614
4615 4615 ASSERT(padlen <= 7);
4616 4616 switch (padlen) {
4617 4617 case 0:
4618 4618 break;
4619 4619 case 1:
4620 4620 cp[0] = IP6OPT_PAD1;
4621 4621 break;
4622 4622 default:
4623 4623 cp[0] = IP6OPT_PADN;
4624 4624 cp[1] = padlen - 2;
4625 4625 bzero(&cp[2], padlen - 2);
4626 4626 break;
4627 4627 }
4628 4628 cp += padlen;
4629 4629 } else if (ipp->ipp_fields & IPPF_HOPOPTS) {
4630 4630 /* Hop-by-hop options */
4631 4631 ip6_hbh_t *hbh = (ip6_hbh_t *)cp;
4632 4632
4633 4633 *nxthdr_ptr = IPPROTO_HOPOPTS;
4634 4634 nxthdr_ptr = &hbh->ip6h_nxt;
4635 4635
4636 4636 bcopy(ipp->ipp_hopopts, cp, ipp->ipp_hopoptslen);
4637 4637 cp += ipp->ipp_hopoptslen;
4638 4638 }
4639 4639 /*
4640 4640 * En-route destination options
4641 4641 * Only do them if there's a routing header as well
4642 4642 */
4643 4643 if ((ipp->ipp_fields & (IPPF_RTHDRDSTOPTS|IPPF_RTHDR)) ==
4644 4644 (IPPF_RTHDRDSTOPTS|IPPF_RTHDR)) {
4645 4645 ip6_dest_t *dst = (ip6_dest_t *)cp;
4646 4646
4647 4647 *nxthdr_ptr = IPPROTO_DSTOPTS;
4648 4648 nxthdr_ptr = &dst->ip6d_nxt;
4649 4649
4650 4650 bcopy(ipp->ipp_rthdrdstopts, cp, ipp->ipp_rthdrdstoptslen);
4651 4651 cp += ipp->ipp_rthdrdstoptslen;
4652 4652 }
4653 4653 /*
4654 4654 * Routing header next
4655 4655 */
4656 4656 if (ipp->ipp_fields & IPPF_RTHDR) {
4657 4657 ip6_rthdr_t *rt = (ip6_rthdr_t *)cp;
4658 4658
4659 4659 *nxthdr_ptr = IPPROTO_ROUTING;
4660 4660 nxthdr_ptr = &rt->ip6r_nxt;
4661 4661
4662 4662 bcopy(ipp->ipp_rthdr, cp, ipp->ipp_rthdrlen);
4663 4663 cp += ipp->ipp_rthdrlen;
4664 4664 }
4665 4665 /*
4666 4666 * Do ultimate destination options
4667 4667 */
4668 4668 if (ipp->ipp_fields & IPPF_DSTOPTS) {
4669 4669 ip6_dest_t *dest = (ip6_dest_t *)cp;
4670 4670
4671 4671 *nxthdr_ptr = IPPROTO_DSTOPTS;
4672 4672 nxthdr_ptr = &dest->ip6d_nxt;
4673 4673
4674 4674 bcopy(ipp->ipp_dstopts, cp, ipp->ipp_dstoptslen);
4675 4675 cp += ipp->ipp_dstoptslen;
4676 4676 }
4677 4677 /*
4678 4678 * Now set the last header pointer to the proto passed in
4679 4679 */
4680 4680 *nxthdr_ptr = protocol;
4681 4681 ASSERT((int)(cp - buf) == buf_len);
4682 4682 }
4683 4683
4684 4684 /*
4685 4685 * Return a pointer to the routing header extension header
4686 4686 * in the IPv6 header(s) chain passed in.
4687 4687 * If none found, return NULL
4688 4688 * Assumes that all extension headers are in same mblk as the v6 header
4689 4689 */
4690 4690 ip6_rthdr_t *
4691 4691 ip_find_rthdr_v6(ip6_t *ip6h, uint8_t *endptr)
4692 4692 {
4693 4693 ip6_dest_t *desthdr;
4694 4694 ip6_frag_t *fraghdr;
4695 4695 uint_t hdrlen;
4696 4696 uint8_t nexthdr;
4697 4697 uint8_t *ptr = (uint8_t *)&ip6h[1];
4698 4698
4699 4699 if (ip6h->ip6_nxt == IPPROTO_ROUTING)
4700 4700 return ((ip6_rthdr_t *)ptr);
4701 4701
4702 4702 /*
4703 4703 * The routing header will precede all extension headers
4704 4704 * other than the hop-by-hop and destination options
4705 4705 * extension headers, so if we see anything other than those,
4706 4706 * we're done and didn't find it.
4707 4707 * We could see a destination options header alone but no
4708 4708 * routing header, in which case we'll return NULL as soon as
4709 4709 * we see anything after that.
4710 4710 * Hop-by-hop and destination option headers are identical,
4711 4711 * so we can use either one we want as a template.
4712 4712 */
4713 4713 nexthdr = ip6h->ip6_nxt;
4714 4714 while (ptr < endptr) {
4715 4715 /* Is there enough left for len + nexthdr? */
4716 4716 if (ptr + MIN_EHDR_LEN > endptr)
4717 4717 return (NULL);
4718 4718
4719 4719 switch (nexthdr) {
4720 4720 case IPPROTO_HOPOPTS:
4721 4721 case IPPROTO_DSTOPTS:
4722 4722 /* Assumes the headers are identical for hbh and dst */
4723 4723 desthdr = (ip6_dest_t *)ptr;
4724 4724 hdrlen = 8 * (desthdr->ip6d_len + 1);
4725 4725 nexthdr = desthdr->ip6d_nxt;
4726 4726 break;
4727 4727
4728 4728 case IPPROTO_ROUTING:
4729 4729 return ((ip6_rthdr_t *)ptr);
4730 4730
4731 4731 case IPPROTO_FRAGMENT:
4732 4732 fraghdr = (ip6_frag_t *)ptr;
4733 4733 hdrlen = sizeof (ip6_frag_t);
4734 4734 nexthdr = fraghdr->ip6f_nxt;
4735 4735 break;
4736 4736
4737 4737 default:
4738 4738 return (NULL);
4739 4739 }
4740 4740 ptr += hdrlen;
4741 4741 }
4742 4742 return (NULL);
4743 4743 }
4744 4744
4745 4745 /*
4746 4746 * Called for source-routed packets originating on this node.
4747 4747 * Manipulates the original routing header by moving every entry up
4748 4748 * one slot, placing the first entry in the v6 header's v6_dst field,
4749 4749 * and placing the ultimate destination in the routing header's last
4750 4750 * slot.
4751 4751 *
4752 4752 * Returns the checksum diference between the ultimate destination
4753 4753 * (last hop in the routing header when the packet is sent) and
4754 4754 * the first hop (ip6_dst when the packet is sent)
4755 4755 */
4756 4756 /* ARGSUSED2 */
4757 4757 uint32_t
4758 4758 ip_massage_options_v6(ip6_t *ip6h, ip6_rthdr_t *rth, netstack_t *ns)
4759 4759 {
4760 4760 uint_t numaddr;
4761 4761 uint_t i;
4762 4762 in6_addr_t *addrptr;
4763 4763 in6_addr_t tmp;
4764 4764 ip6_rthdr0_t *rthdr = (ip6_rthdr0_t *)rth;
4765 4765 uint32_t cksm;
4766 4766 uint32_t addrsum = 0;
4767 4767 uint16_t *ptr;
4768 4768
4769 4769 /*
4770 4770 * Perform any processing needed for source routing.
4771 4771 * We know that all extension headers will be in the same mblk
4772 4772 * as the IPv6 header.
4773 4773 */
4774 4774
4775 4775 /*
4776 4776 * If no segments left in header, or the header length field is zero,
4777 4777 * don't move hop addresses around;
4778 4778 * Checksum difference is zero.
4779 4779 */
4780 4780 if ((rthdr->ip6r0_segleft == 0) || (rthdr->ip6r0_len == 0))
4781 4781 return (0);
4782 4782
4783 4783 ptr = (uint16_t *)&ip6h->ip6_dst;
4784 4784 cksm = 0;
4785 4785 for (i = 0; i < (sizeof (in6_addr_t) / sizeof (uint16_t)); i++) {
4786 4786 cksm += ptr[i];
4787 4787 }
4788 4788 cksm = (cksm & 0xFFFF) + (cksm >> 16);
4789 4789
4790 4790 /*
4791 4791 * Here's where the fun begins - we have to
4792 4792 * move all addresses up one spot, take the
4793 4793 * first hop and make it our first ip6_dst,
4794 4794 * and place the ultimate destination in the
4795 4795 * newly-opened last slot.
4796 4796 */
4797 4797 addrptr = (in6_addr_t *)((char *)rthdr + sizeof (*rthdr));
4798 4798 numaddr = rthdr->ip6r0_len / 2;
4799 4799 tmp = *addrptr;
4800 4800 for (i = 0; i < (numaddr - 1); addrptr++, i++) {
4801 4801 *addrptr = addrptr[1];
4802 4802 }
4803 4803 *addrptr = ip6h->ip6_dst;
4804 4804 ip6h->ip6_dst = tmp;
4805 4805
4806 4806 /*
4807 4807 * From the checksummed ultimate destination subtract the checksummed
4808 4808 * current ip6_dst (the first hop address). Return that number.
4809 4809 * (In the v4 case, the second part of this is done in each routine
4810 4810 * that calls ip_massage_options(). We do it all in this one place
4811 4811 * for v6).
4812 4812 */
4813 4813 ptr = (uint16_t *)&ip6h->ip6_dst;
4814 4814 for (i = 0; i < (sizeof (in6_addr_t) / sizeof (uint16_t)); i++) {
4815 4815 addrsum += ptr[i];
4816 4816 }
4817 4817 cksm -= ((addrsum >> 16) + (addrsum & 0xFFFF));
4818 4818 if ((int)cksm < 0)
4819 4819 cksm--;
4820 4820 cksm = (cksm & 0xFFFF) + (cksm >> 16);
4821 4821
4822 4822 return (cksm);
4823 4823 }
4824 4824
4825 4825 void
4826 4826 *ip6_kstat_init(netstackid_t stackid, ip6_stat_t *ip6_statisticsp)
4827 4827 {
4828 4828 kstat_t *ksp;
4829 4829
4830 4830 ip6_stat_t template = {
4831 4831 { "ip6_udp_fannorm", KSTAT_DATA_UINT64 },
4832 4832 { "ip6_udp_fanmb", KSTAT_DATA_UINT64 },
4833 4833 { "ip6_recv_pullup", KSTAT_DATA_UINT64 },
4834 4834 { "ip6_db_ref", KSTAT_DATA_UINT64 },
4835 4835 { "ip6_notaligned", KSTAT_DATA_UINT64 },
4836 4836 { "ip6_multimblk", KSTAT_DATA_UINT64 },
4837 4837 { "ipsec_proto_ahesp", KSTAT_DATA_UINT64 },
4838 4838 { "ip6_out_sw_cksum", KSTAT_DATA_UINT64 },
4839 4839 { "ip6_out_sw_cksum_bytes", KSTAT_DATA_UINT64 },
4840 4840 { "ip6_in_sw_cksum", KSTAT_DATA_UINT64 },
4841 4841 { "ip6_tcp_in_full_hw_cksum_err", KSTAT_DATA_UINT64 },
4842 4842 { "ip6_tcp_in_part_hw_cksum_err", KSTAT_DATA_UINT64 },
4843 4843 { "ip6_tcp_in_sw_cksum_err", KSTAT_DATA_UINT64 },
4844 4844 { "ip6_udp_in_full_hw_cksum_err", KSTAT_DATA_UINT64 },
4845 4845 { "ip6_udp_in_part_hw_cksum_err", KSTAT_DATA_UINT64 },
4846 4846 { "ip6_udp_in_sw_cksum_err", KSTAT_DATA_UINT64 },
4847 4847 };
4848 4848 ksp = kstat_create_netstack("ip", 0, "ip6stat", "net",
4849 4849 KSTAT_TYPE_NAMED, sizeof (template) / sizeof (kstat_named_t),
4850 4850 KSTAT_FLAG_VIRTUAL, stackid);
4851 4851
4852 4852 if (ksp == NULL)
4853 4853 return (NULL);
4854 4854
4855 4855 bcopy(&template, ip6_statisticsp, sizeof (template));
4856 4856 ksp->ks_data = (void *)ip6_statisticsp;
4857 4857 ksp->ks_private = (void *)(uintptr_t)stackid;
4858 4858
4859 4859 kstat_install(ksp);
4860 4860 return (ksp);
4861 4861 }
4862 4862
4863 4863 void
4864 4864 ip6_kstat_fini(netstackid_t stackid, kstat_t *ksp)
4865 4865 {
4866 4866 if (ksp != NULL) {
4867 4867 ASSERT(stackid == (netstackid_t)(uintptr_t)ksp->ks_private);
4868 4868 kstat_delete_netstack(ksp, stackid);
4869 4869 }
4870 4870 }
4871 4871
4872 4872 /*
4873 4873 * The following two functions set and get the value for the
4874 4874 * IPV6_SRC_PREFERENCES socket option.
4875 4875 */
4876 4876 int
4877 4877 ip6_set_src_preferences(ip_xmit_attr_t *ixa, uint32_t prefs)
4878 4878 {
4879 4879 /*
4880 4880 * We only support preferences that are covered by
4881 4881 * IPV6_PREFER_SRC_MASK.
4882 4882 */
4883 4883 if (prefs & ~IPV6_PREFER_SRC_MASK)
4884 4884 return (EINVAL);
4885 4885
4886 4886 /*
4887 4887 * Look for conflicting preferences or default preferences. If
4888 4888 * both bits of a related pair are clear, the application wants the
4889 4889 * system's default value for that pair. Both bits in a pair can't
4890 4890 * be set.
4891 4891 */
4892 4892 if ((prefs & IPV6_PREFER_SRC_MIPMASK) == 0) {
4893 4893 prefs |= IPV6_PREFER_SRC_MIPDEFAULT;
4894 4894 } else if ((prefs & IPV6_PREFER_SRC_MIPMASK) ==
4895 4895 IPV6_PREFER_SRC_MIPMASK) {
4896 4896 return (EINVAL);
4897 4897 }
4898 4898 if ((prefs & IPV6_PREFER_SRC_TMPMASK) == 0) {
4899 4899 prefs |= IPV6_PREFER_SRC_TMPDEFAULT;
4900 4900 } else if ((prefs & IPV6_PREFER_SRC_TMPMASK) ==
4901 4901 IPV6_PREFER_SRC_TMPMASK) {
4902 4902 return (EINVAL);
4903 4903 }
4904 4904 if ((prefs & IPV6_PREFER_SRC_CGAMASK) == 0) {
4905 4905 prefs |= IPV6_PREFER_SRC_CGADEFAULT;
4906 4906 } else if ((prefs & IPV6_PREFER_SRC_CGAMASK) ==
4907 4907 IPV6_PREFER_SRC_CGAMASK) {
4908 4908 return (EINVAL);
4909 4909 }
4910 4910
4911 4911 ixa->ixa_src_preferences = prefs;
4912 4912 return (0);
4913 4913 }
4914 4914
4915 4915 size_t
4916 4916 ip6_get_src_preferences(ip_xmit_attr_t *ixa, uint32_t *val)
4917 4917 {
4918 4918 *val = ixa->ixa_src_preferences;
4919 4919 return (sizeof (ixa->ixa_src_preferences));
4920 4920 }
4921 4921
4922 4922 /*
4923 4923 * Get the size of the IP options (including the IP headers size)
4924 4924 * without including the AH header's size. If till_ah is B_FALSE,
4925 4925 * and if AH header is present, dest options beyond AH header will
4926 4926 * also be included in the returned size.
4927 4927 */
4928 4928 int
4929 4929 ipsec_ah_get_hdr_size_v6(mblk_t *mp, boolean_t till_ah)
4930 4930 {
4931 4931 ip6_t *ip6h;
4932 4932 uint8_t nexthdr;
4933 4933 uint8_t *whereptr;
4934 4934 ip6_hbh_t *hbhhdr;
4935 4935 ip6_dest_t *dsthdr;
4936 4936 ip6_rthdr_t *rthdr;
4937 4937 int ehdrlen;
4938 4938 int size;
4939 4939 ah_t *ah;
4940 4940
4941 4941 ip6h = (ip6_t *)mp->b_rptr;
4942 4942 size = IPV6_HDR_LEN;
4943 4943 nexthdr = ip6h->ip6_nxt;
4944 4944 whereptr = (uint8_t *)&ip6h[1];
4945 4945 for (;;) {
4946 4946 /* Assume IP has already stripped it */
4947 4947 ASSERT(nexthdr != IPPROTO_FRAGMENT);
4948 4948 switch (nexthdr) {
4949 4949 case IPPROTO_HOPOPTS:
4950 4950 hbhhdr = (ip6_hbh_t *)whereptr;
4951 4951 nexthdr = hbhhdr->ip6h_nxt;
4952 4952 ehdrlen = 8 * (hbhhdr->ip6h_len + 1);
4953 4953 break;
4954 4954 case IPPROTO_DSTOPTS:
4955 4955 dsthdr = (ip6_dest_t *)whereptr;
4956 4956 nexthdr = dsthdr->ip6d_nxt;
4957 4957 ehdrlen = 8 * (dsthdr->ip6d_len + 1);
4958 4958 break;
4959 4959 case IPPROTO_ROUTING:
4960 4960 rthdr = (ip6_rthdr_t *)whereptr;
4961 4961 nexthdr = rthdr->ip6r_nxt;
4962 4962 ehdrlen = 8 * (rthdr->ip6r_len + 1);
4963 4963 break;
4964 4964 default :
4965 4965 if (till_ah) {
4966 4966 ASSERT(nexthdr == IPPROTO_AH);
4967 4967 return (size);
4968 4968 }
4969 4969 /*
4970 4970 * If we don't have a AH header to traverse,
4971 4971 * return now. This happens normally for
4972 4972 * outbound datagrams where we have not inserted
4973 4973 * the AH header.
4974 4974 */
4975 4975 if (nexthdr != IPPROTO_AH) {
4976 4976 return (size);
4977 4977 }
4978 4978
4979 4979 /*
4980 4980 * We don't include the AH header's size
4981 4981 * to be symmetrical with other cases where
4982 4982 * we either don't have a AH header (outbound)
4983 4983 * or peek into the AH header yet (inbound and
4984 4984 * not pulled up yet).
4985 4985 */
4986 4986 ah = (ah_t *)whereptr;
4987 4987 nexthdr = ah->ah_nexthdr;
4988 4988 ehdrlen = (ah->ah_length << 2) + 8;
4989 4989
4990 4990 if (nexthdr == IPPROTO_DSTOPTS) {
4991 4991 if (whereptr + ehdrlen >= mp->b_wptr) {
4992 4992 /*
4993 4993 * The destination options header
4994 4994 * is not part of the first mblk.
4995 4995 */
4996 4996 whereptr = mp->b_cont->b_rptr;
4997 4997 } else {
4998 4998 whereptr += ehdrlen;
4999 4999 }
5000 5000
5001 5001 dsthdr = (ip6_dest_t *)whereptr;
5002 5002 ehdrlen = 8 * (dsthdr->ip6d_len + 1);
5003 5003 size += ehdrlen;
5004 5004 }
5005 5005 return (size);
5006 5006 }
5007 5007 whereptr += ehdrlen;
5008 5008 size += ehdrlen;
5009 5009 }
5010 5010 }
5011 5011
5012 5012 /*
5013 5013 * Utility routine that checks if `v6srcp' is a valid address on underlying
5014 5014 * interface `ill'. If `ipifp' is non-NULL, it's set to a held ipif
5015 5015 * associated with `v6srcp' on success. NOTE: if this is not called from
5016 5016 * inside the IPSQ (ill_g_lock is not held), `ill' may be removed from the
5017 5017 * group during or after this lookup.
5018 5018 */
5019 5019 boolean_t
5020 5020 ipif_lookup_testaddr_v6(ill_t *ill, const in6_addr_t *v6srcp, ipif_t **ipifp)
5021 5021 {
5022 5022 ipif_t *ipif;
5023 5023
5024 5024
5025 5025 ipif = ipif_lookup_addr_exact_v6(v6srcp, ill, ill->ill_ipst);
5026 5026 if (ipif != NULL) {
5027 5027 if (ipifp != NULL)
5028 5028 *ipifp = ipif;
5029 5029 else
5030 5030 ipif_refrele(ipif);
5031 5031 return (B_TRUE);
5032 5032 }
5033 5033
5034 5034 if (ip_debug > 2) {
5035 5035 pr_addr_dbg("ipif_lookup_testaddr_v6: cannot find ipif for "
5036 5036 "src %s\n", AF_INET6, v6srcp);
5037 5037 }
5038 5038 return (B_FALSE);
5039 5039 }
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