1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26 /* Copyright (c) 1990 Mentat Inc. */
27
28 #include <sys/types.h>
29 #include <sys/stream.h>
30 #include <sys/strsubr.h>
31 #include <sys/dlpi.h>
32 #include <sys/strsun.h>
33 #include <sys/zone.h>
34 #include <sys/ddi.h>
35 #include <sys/sunddi.h>
36 #include <sys/cmn_err.h>
37 #include <sys/debug.h>
38 #include <sys/atomic.h>
39
40 #include <sys/systm.h>
41 #include <sys/param.h>
42 #include <sys/kmem.h>
43 #include <sys/sdt.h>
44 #include <sys/socket.h>
45 #include <sys/mac.h>
46 #include <net/if.h>
47 #include <net/if_arp.h>
48 #include <net/route.h>
49 #include <sys/sockio.h>
50 #include <netinet/in.h>
51 #include <net/if_dl.h>
52
53 #include <inet/common.h>
54 #include <inet/mi.h>
55 #include <inet/mib2.h>
56 #include <inet/nd.h>
57 #include <inet/arp.h>
58 #include <inet/snmpcom.h>
59 #include <inet/kstatcom.h>
60
61 #include <netinet/igmp_var.h>
62 #include <netinet/ip6.h>
63 #include <netinet/icmp6.h>
64 #include <netinet/sctp.h>
65
66 #include <inet/ip.h>
67 #include <inet/ip_impl.h>
68 #include <inet/ip6.h>
69 #include <inet/ip6_asp.h>
70 #include <inet/tcp.h>
71 #include <inet/ip_multi.h>
72 #include <inet/ip_if.h>
73 #include <inet/ip_ire.h>
74 #include <inet/ip_ftable.h>
75 #include <inet/ip_rts.h>
76 #include <inet/optcom.h>
77 #include <inet/ip_ndp.h>
78 #include <inet/ip_listutils.h>
79 #include <netinet/igmp.h>
80 #include <netinet/ip_mroute.h>
81 #include <inet/ipp_common.h>
82
83 #include <net/pfkeyv2.h>
84 #include <inet/sadb.h>
85 #include <inet/ipsec_impl.h>
86 #include <inet/ipdrop.h>
87 #include <inet/ip_netinfo.h>
88
89 #include <sys/pattr.h>
90 #include <inet/ipclassifier.h>
91 #include <inet/sctp_ip.h>
92 #include <inet/sctp/sctp_impl.h>
93 #include <inet/udp_impl.h>
94 #include <sys/sunddi.h>
95
96 #include <sys/tsol/label.h>
97 #include <sys/tsol/tnet.h>
98
99 #ifdef DEBUG
100 extern boolean_t skip_sctp_cksum;
101 #endif
102
103 int
ip_output_simple_v6(mblk_t * mp,ip_xmit_attr_t * ixa)104 ip_output_simple_v6(mblk_t *mp, ip_xmit_attr_t *ixa)
105 {
106 ip6_t *ip6h;
107 in6_addr_t firsthop; /* In IP header */
108 in6_addr_t dst; /* End of source route, or ip6_dst if none */
109 ire_t *ire;
110 in6_addr_t setsrc;
111 int error;
112 ill_t *ill = NULL;
113 dce_t *dce = NULL;
114 nce_t *nce;
115 iaflags_t ixaflags = ixa->ixa_flags;
116 ip_stack_t *ipst = ixa->ixa_ipst;
117 uint8_t *nexthdrp;
118 boolean_t repeat = B_FALSE;
119 boolean_t multirt = B_FALSE;
120 uint_t ifindex;
121 int64_t now;
122
123 ip6h = (ip6_t *)mp->b_rptr;
124 ASSERT(IPH_HDR_VERSION(ip6h) == IPV6_VERSION);
125
126 ASSERT(ixa->ixa_nce == NULL);
127
128 ixa->ixa_pktlen = ntohs(ip6h->ip6_plen) + IPV6_HDR_LEN;
129 ASSERT(ixa->ixa_pktlen == msgdsize(mp));
130 if (!ip_hdr_length_nexthdr_v6(mp, ip6h, &ixa->ixa_ip_hdr_length,
131 &nexthdrp)) {
132 /* Malformed packet */
133 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
134 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards);
135 ip_drop_output("ipIfStatsOutDiscards", mp, NULL);
136 freemsg(mp);
137 return (EINVAL);
138 }
139 ixa->ixa_protocol = *nexthdrp;
140
141 /*
142 * Assumes that source routed packets have already been massaged by
143 * the ULP (ip_massage_options_v6) and as a result ip6_dst is the next
144 * hop in the source route. The final destination is used for IPsec
145 * policy and DCE lookup.
146 */
147 firsthop = ip6h->ip6_dst;
148 dst = ip_get_dst_v6(ip6h, mp, NULL);
149
150 repeat_ire:
151 error = 0;
152 setsrc = ipv6_all_zeros;
153 ire = ip_select_route_v6(&firsthop, ip6h->ip6_src, ixa, NULL, &setsrc,
154 &error, &multirt);
155 ASSERT(ire != NULL); /* IRE_NOROUTE if none found */
156 if (error != 0) {
157 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
158 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards);
159 ip_drop_output("ipIfStatsOutDiscards", mp, NULL);
160 freemsg(mp);
161 goto done;
162 }
163
164 if (ire->ire_flags & (RTF_BLACKHOLE|RTF_REJECT)) {
165 /* ire_ill might be NULL hence need to skip some code */
166 if (ixaflags & IXAF_SET_SOURCE)
167 ip6h->ip6_src = ipv6_loopback;
168 ixa->ixa_fragsize = IP_MAXPACKET;
169 ire->ire_ob_pkt_count++;
170 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
171 /* No dce yet; use default one */
172 error = (ire->ire_sendfn)(ire, mp, ip6h, ixa,
173 &ipst->ips_dce_default->dce_ident);
174 goto done;
175 }
176
177 /* Note that ip6_dst is only used for IRE_MULTICAST */
178 nce = ire_to_nce(ire, INADDR_ANY, &ip6h->ip6_dst);
179 if (nce == NULL) {
180 /* Allocation failure? */
181 ip_drop_output("ire_to_nce", mp, ill);
182 freemsg(mp);
183 error = ENOBUFS;
184 goto done;
185 }
186 if (nce->nce_is_condemned) {
187 nce_t *nce1;
188
189 nce1 = ire_handle_condemned_nce(nce, ire, NULL, ip6h, B_TRUE);
190 nce_refrele(nce);
191 if (nce1 == NULL) {
192 if (!repeat) {
193 /* Try finding a better IRE */
194 repeat = B_TRUE;
195 ire_refrele(ire);
196 goto repeat_ire;
197 }
198 /* Tried twice - drop packet */
199 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards);
200 ip_drop_output("No nce", mp, ill);
201 freemsg(mp);
202 error = ENOBUFS;
203 goto done;
204 }
205 nce = nce1;
206 }
207 /*
208 * For multicast with multirt we have a flag passed back from
209 * ire_lookup_multi_ill_v6 since we don't have an IRE for each
210 * possible multicast address.
211 * We also need a flag for multicast since we can't check
212 * whether RTF_MULTIRT is set in ixa_ire for multicast.
213 */
214 if (multirt) {
215 ixa->ixa_postfragfn = ip_postfrag_multirt_v6;
216 ixa->ixa_flags |= IXAF_MULTIRT_MULTICAST;
217 } else {
218 ixa->ixa_postfragfn = ire->ire_postfragfn;
219 ixa->ixa_flags &= ~IXAF_MULTIRT_MULTICAST;
220 }
221 ASSERT(ixa->ixa_nce == NULL);
222 ixa->ixa_nce = nce;
223
224 /*
225 * Check for a dce_t with a path mtu.
226 */
227 ifindex = 0;
228 if (IN6_IS_ADDR_LINKSCOPE(&dst))
229 ifindex = nce->nce_common->ncec_ill->ill_phyint->phyint_ifindex;
230
231 dce = dce_lookup_v6(&dst, ifindex, ipst, NULL);
232 ASSERT(dce != NULL);
233
234 if (!(ixaflags & IXAF_PMTU_DISCOVERY)) {
235 ixa->ixa_fragsize = IPV6_MIN_MTU;
236 } else if (dce->dce_flags & DCEF_PMTU) {
237 /*
238 * To avoid a periodic timer to increase the path MTU we
239 * look at dce_last_change_time each time we send a packet.
240 */
241 now = ddi_get_lbolt64();
242 if (TICK_TO_SEC(now) - dce->dce_last_change_time >
243 ipst->ips_ip_pathmtu_interval) {
244 /*
245 * Older than 20 minutes. Drop the path MTU information.
246 */
247 mutex_enter(&dce->dce_lock);
248 dce->dce_flags &= ~(DCEF_PMTU|DCEF_TOO_SMALL_PMTU);
249 dce->dce_last_change_time = TICK_TO_SEC(now);
250 mutex_exit(&dce->dce_lock);
251 dce_increment_generation(dce);
252 ixa->ixa_fragsize = ip_get_base_mtu(nce->nce_ill, ire);
253 } else {
254 uint_t fragsize;
255
256 fragsize = ip_get_base_mtu(nce->nce_ill, ire);
257 if (fragsize > dce->dce_pmtu)
258 fragsize = dce->dce_pmtu;
259 ixa->ixa_fragsize = fragsize;
260 }
261 } else {
262 ixa->ixa_fragsize = ip_get_base_mtu(nce->nce_ill, ire);
263 }
264
265 /*
266 * We use use ire_nexthop_ill (and not ncec_ill) to avoid the under ipmp
267 * interface for source address selection.
268 */
269 ill = ire_nexthop_ill(ire);
270
271 if (ixaflags & IXAF_SET_SOURCE) {
272 in6_addr_t src;
273
274 /*
275 * We use the final destination to get
276 * correct selection for source routed packets
277 */
278
279 /* If unreachable we have no ill but need some source */
280 if (ill == NULL) {
281 src = ipv6_loopback;
282 error = 0;
283 } else {
284 error = ip_select_source_v6(ill, &setsrc, &dst,
285 ixa->ixa_zoneid, ipst, B_FALSE,
286 ixa->ixa_src_preferences, &src, NULL, NULL);
287 }
288 if (error != 0) {
289 BUMP_MIB(ill->ill_ip_mib, ipIfStatsHCOutRequests);
290 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
291 ip_drop_output("ipIfStatsOutDiscards - no source",
292 mp, ill);
293 freemsg(mp);
294 goto done;
295 }
296 ip6h->ip6_src = src;
297 } else if (ixaflags & IXAF_VERIFY_SOURCE) {
298 /* Check if the IP source is assigned to the host. */
299 if (!ip_verify_src(mp, ixa, NULL)) {
300 /* Don't send a packet with a source that isn't ours */
301 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
302 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards);
303 ip_drop_output("ipIfStatsOutDiscards - invalid source",
304 mp, ill);
305 freemsg(mp);
306 error = EADDRNOTAVAIL;
307 goto done;
308 }
309 }
310
311 /*
312 * Check against global IPsec policy to set the AH/ESP attributes.
313 * IPsec will set IXAF_IPSEC_* and ixa_ipsec_* as appropriate.
314 */
315 if (!(ixaflags & (IXAF_NO_IPSEC|IXAF_IPSEC_SECURE))) {
316 ASSERT(ixa->ixa_ipsec_policy == NULL);
317 mp = ip_output_attach_policy(mp, NULL, ip6h, NULL, ixa);
318 if (mp == NULL) {
319 /* MIB and ip_drop_packet already done */
320 return (EHOSTUNREACH); /* IPsec policy failure */
321 }
322 }
323
324 if (ill != NULL) {
325 BUMP_MIB(ill->ill_ip_mib, ipIfStatsHCOutRequests);
326 } else {
327 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsHCOutRequests);
328 }
329
330 /*
331 * We update the statistics on the most specific IRE i.e., the first
332 * one we found.
333 * We don't have an IRE when we fragment, hence ire_ob_pkt_count
334 * can only count the use prior to fragmentation. However the MIB
335 * counters on the ill will be incremented in post fragmentation.
336 */
337 ire->ire_ob_pkt_count++;
338
339 /*
340 * Based on ire_type and ire_flags call one of:
341 * ire_send_local_v6 - for IRE_LOCAL and IRE_LOOPBACK
342 * ire_send_multirt_v6 - if RTF_MULTIRT
343 * ire_send_noroute_v6 - if RTF_REJECT or RTF_BLACHOLE
344 * ire_send_multicast_v6 - for IRE_MULTICAST
345 * ire_send_wire_v6 - for the rest.
346 */
347 error = (ire->ire_sendfn)(ire, mp, ip6h, ixa, &dce->dce_ident);
348 done:
349 ire_refrele(ire);
350 if (dce != NULL)
351 dce_refrele(dce);
352 if (ill != NULL)
353 ill_refrele(ill);
354 if (ixa->ixa_nce != NULL)
355 nce_refrele(ixa->ixa_nce);
356 ixa->ixa_nce = NULL;
357 return (error);
358 }
359
360 /*
361 * ire_sendfn() functions.
362 * These functions use the following xmit_attr:
363 * - ixa_fragsize - read to determine whether or not to fragment
364 * - IXAF_IPSEC_SECURE - to determine whether or not to invoke IPsec
365 * - ixa_ipsec_* are used inside IPsec
366 * - IXAF_LOOPBACK_COPY - for multicast
367 */
368
369
370 /*
371 * ire_sendfn for IRE_LOCAL and IRE_LOOPBACK
372 *
373 * The checks for restrict_interzone_loopback are done in ire_route_recursive.
374 */
375 /* ARGSUSED4 */
376 int
ire_send_local_v6(ire_t * ire,mblk_t * mp,void * iph_arg,ip_xmit_attr_t * ixa,uint32_t * identp)377 ire_send_local_v6(ire_t *ire, mblk_t *mp, void *iph_arg,
378 ip_xmit_attr_t *ixa, uint32_t *identp)
379 {
380 ip6_t *ip6h = (ip6_t *)iph_arg;
381 ip_stack_t *ipst = ixa->ixa_ipst;
382 ill_t *ill = ire->ire_ill;
383 ip_recv_attr_t iras; /* NOTE: No bzero for performance */
384 uint_t pktlen = ixa->ixa_pktlen;
385
386 /*
387 * No fragmentation, no nce, and no application of IPsec.
388 *
389 *
390 * Note different order between IP provider and FW_HOOKS than in
391 * send_wire case.
392 */
393
394 /*
395 * DTrace this as ip:::send. A packet blocked by FW_HOOKS will fire the
396 * send probe, but not the receive probe.
397 */
398 DTRACE_IP7(send, mblk_t *, mp, conn_t *, NULL, void_ip_t *,
399 ip6h, __dtrace_ipsr_ill_t *, ill, ipha_t *, NULL, ip6_t *, ip6h,
400 int, 1);
401
402 DTRACE_PROBE4(ip6__loopback__out__start,
403 ill_t *, NULL, ill_t *, ill,
404 ip6_t *, ip6h, mblk_t *, mp);
405
406 if (HOOKS6_INTERESTED_LOOPBACK_OUT(ipst)) {
407 int error;
408
409 FW_HOOKS(ipst->ips_ip6_loopback_out_event,
410 ipst->ips_ipv6firewall_loopback_out,
411 NULL, ill, ip6h, mp, mp, 0, ipst, error);
412
413 DTRACE_PROBE1(ip6__loopback__out__end, mblk_t *, mp);
414 if (mp == NULL)
415 return (error);
416
417 /*
418 * Even if the destination was changed by the filter we use the
419 * forwarding decision that was made based on the address
420 * in ip_output/ip_set_destination.
421 */
422 /* Length could be different */
423 ip6h = (ip6_t *)mp->b_rptr;
424 pktlen = ntohs(ip6h->ip6_plen) + IPV6_HDR_LEN;
425 }
426
427 /*
428 * If a callback is enabled then we need to know the
429 * source and destination zoneids for the packet. We already
430 * have those handy.
431 */
432 if (ipst->ips_ip6_observe.he_interested) {
433 zoneid_t szone, dzone;
434 zoneid_t stackzoneid;
435
436 stackzoneid = netstackid_to_zoneid(
437 ipst->ips_netstack->netstack_stackid);
438
439 if (stackzoneid == GLOBAL_ZONEID) {
440 /* Shared-IP zone */
441 dzone = ire->ire_zoneid;
442 szone = ixa->ixa_zoneid;
443 } else {
444 szone = dzone = stackzoneid;
445 }
446 ipobs_hook(mp, IPOBS_HOOK_LOCAL, szone, dzone, ill, ipst);
447 }
448
449 /* Handle lo0 stats */
450 ipst->ips_loopback_packets++;
451
452 /*
453 * Update output mib stats. Note that we can't move into the icmp
454 * sender (icmp_output etc) since they don't know the ill and the
455 * stats are per ill.
456 */
457 if (ixa->ixa_protocol == IPPROTO_ICMPV6) {
458 icmp6_t *icmp6;
459
460 icmp6 = (icmp6_t *)((uchar_t *)ip6h + ixa->ixa_ip_hdr_length);
461 icmp_update_out_mib_v6(ill, icmp6);
462 }
463
464 DTRACE_PROBE4(ip6__loopback__in__start,
465 ill_t *, ill, ill_t *, NULL,
466 ip6_t *, ip6h, mblk_t *, mp);
467
468 if (HOOKS6_INTERESTED_LOOPBACK_IN(ipst)) {
469 int error;
470
471 FW_HOOKS(ipst->ips_ip6_loopback_in_event,
472 ipst->ips_ipv6firewall_loopback_in,
473 ill, NULL, ip6h, mp, mp, 0, ipst, error);
474
475 DTRACE_PROBE1(ip6__loopback__in__end, mblk_t *, mp);
476 if (mp == NULL)
477 return (error);
478
479 /*
480 * Even if the destination was changed by the filter we use the
481 * forwarding decision that was made based on the address
482 * in ip_output/ip_set_destination.
483 */
484 /* Length could be different */
485 ip6h = (ip6_t *)mp->b_rptr;
486 pktlen = ntohs(ip6h->ip6_plen) + IPV6_HDR_LEN;
487 }
488
489 DTRACE_IP7(receive, mblk_t *, mp, conn_t *, NULL, void_ip_t *,
490 ip6h, __dtrace_ipsr_ill_t *, ill, ipha_t *, NULL, ip6_t *, ip6h,
491 int, 1);
492
493 /* Map ixa to ira including IPsec policies */
494 ipsec_out_to_in(ixa, ill, &iras);
495 iras.ira_pktlen = pktlen;
496
497 ire->ire_ib_pkt_count++;
498 BUMP_MIB(ill->ill_ip_mib, ipIfStatsHCInReceives);
499 UPDATE_MIB(ill->ill_ip_mib, ipIfStatsHCInOctets, pktlen);
500
501 /* Destined to ire_zoneid - use that for fanout */
502 iras.ira_zoneid = ire->ire_zoneid;
503
504 if (is_system_labeled()) {
505 iras.ira_flags |= IRAF_SYSTEM_LABELED;
506
507 /*
508 * This updates ira_cred, ira_tsl and ira_free_flags based
509 * on the label. We don't expect this to ever fail for
510 * loopback packets, so we silently drop the packet should it
511 * fail.
512 */
513 if (!tsol_get_pkt_label(mp, IPV6_VERSION, &iras)) {
514 BUMP_MIB(ill->ill_ip_mib, ipIfStatsInDiscards);
515 ip_drop_input("tsol_get_pkt_label", mp, ill);
516 freemsg(mp);
517 return (0);
518 }
519 ASSERT(iras.ira_tsl != NULL);
520
521 /* tsol_get_pkt_label sometimes does pullupmsg */
522 ip6h = (ip6_t *)mp->b_rptr;
523 }
524
525 ip_fanout_v6(mp, ip6h, &iras);
526
527 /* We moved any IPsec refs from ixa to iras */
528 ira_cleanup(&iras, B_FALSE);
529 return (0);
530 }
531
532 static void
multirt_check_v6(ire_t * ire,ip6_t * ip6h,ip_xmit_attr_t * ixa)533 multirt_check_v6(ire_t *ire, ip6_t *ip6h, ip_xmit_attr_t *ixa)
534 {
535 ip_stack_t *ipst = ixa->ixa_ipst;
536
537 /* Limit the TTL on multirt packets. Do this even if IPV6_HOPLIMIT */
538 if (ire->ire_type & IRE_MULTICAST) {
539 if (ip6h->ip6_hops > 1) {
540 ip2dbg(("ire_send_multirt_v6: forcing multicast "
541 "multirt TTL to 1 (was %d)\n", ip6h->ip6_hops));
542 ip6h->ip6_hops = 1;
543 }
544 ixa->ixa_flags |= IXAF_NO_TTL_CHANGE;
545 } else if ((ipst->ips_ip_multirt_ttl > 0) &&
546 (ip6h->ip6_hops > ipst->ips_ip_multirt_ttl)) {
547 ip6h->ip6_hops = ipst->ips_ip_multirt_ttl;
548 /*
549 * Need to ensure we don't increase the ttl should we go through
550 * ire_send_multicast.
551 */
552 ixa->ixa_flags |= IXAF_NO_TTL_CHANGE;
553 }
554
555 /* For IPv6 this also needs to insert a fragment header */
556 ixa->ixa_flags |= IXAF_IPV6_ADD_FRAGHDR;
557 }
558
559 /*
560 * ire_sendfn for IRE_MULTICAST
561 *
562 * Note that we do path MTU discovery by default for IPv6 multicast. But
563 * since unconnected UDP and RAW sockets don't set IXAF_PMTU_DISCOVERY
564 * only connected sockets get this by default.
565 */
566 int
ire_send_multicast_v6(ire_t * ire,mblk_t * mp,void * iph_arg,ip_xmit_attr_t * ixa,uint32_t * identp)567 ire_send_multicast_v6(ire_t *ire, mblk_t *mp, void *iph_arg,
568 ip_xmit_attr_t *ixa, uint32_t *identp)
569 {
570 ip6_t *ip6h = (ip6_t *)iph_arg;
571 ip_stack_t *ipst = ixa->ixa_ipst;
572 ill_t *ill = ire->ire_ill;
573 iaflags_t ixaflags = ixa->ixa_flags;
574
575 /*
576 * The IRE_MULTICAST is the same whether or not multirt is in use.
577 * Hence we need special-case code.
578 */
579 if (ixaflags & IXAF_MULTIRT_MULTICAST)
580 multirt_check_v6(ire, ip6h, ixa);
581
582 /*
583 * Check if anything in ip_input_v6 wants a copy of the transmitted
584 * packet (after IPsec and fragmentation)
585 *
586 * 1. Multicast routers always need a copy unless SO_DONTROUTE is set
587 * RSVP and the rsvp daemon is an example of a
588 * protocol and user level process that
589 * handles it's own routing. Hence, it uses the
590 * SO_DONTROUTE option to accomplish this.
591 * 2. If the sender has set IP_MULTICAST_LOOP, then we just
592 * check whether there are any receivers for the group on the ill
593 * (ignoring the zoneid).
594 * 3. If IP_MULTICAST_LOOP is not set, then we check if there are
595 * any members in other shared-IP zones.
596 * If such members exist, then we indicate that the sending zone
597 * shouldn't get a loopback copy to preserve the IP_MULTICAST_LOOP
598 * behavior.
599 *
600 * When we loopback we skip hardware checksum to make sure loopback
601 * copy is checksumed.
602 *
603 * Note that ire_ill is the upper in the case of IPMP.
604 */
605 ixa->ixa_flags &= ~(IXAF_LOOPBACK_COPY | IXAF_NO_HW_CKSUM);
606 if (ipst->ips_ip_g_mrouter && ill->ill_mrouter_cnt > 0 &&
607 !(ixaflags & IXAF_DONTROUTE)) {
608 ixa->ixa_flags |= IXAF_LOOPBACK_COPY | IXAF_NO_HW_CKSUM;
609 } else if (ixaflags & IXAF_MULTICAST_LOOP) {
610 /*
611 * If this zone or any other zone has members then loopback
612 * a copy.
613 */
614 if (ill_hasmembers_v6(ill, &ip6h->ip6_dst))
615 ixa->ixa_flags |= IXAF_LOOPBACK_COPY | IXAF_NO_HW_CKSUM;
616 } else if (ipst->ips_netstack->netstack_numzones > 1) {
617 /*
618 * This zone should not have a copy. But there are some other
619 * zones which might have members.
620 */
621 if (ill_hasmembers_otherzones_v6(ill, &ip6h->ip6_dst,
622 ixa->ixa_zoneid)) {
623 ixa->ixa_flags |= IXAF_NO_LOOP_ZONEID_SET;
624 ixa->ixa_no_loop_zoneid = ixa->ixa_zoneid;
625 ixa->ixa_flags |= IXAF_LOOPBACK_COPY | IXAF_NO_HW_CKSUM;
626 }
627 }
628
629 /*
630 * Unless IPV6_HOPLIMIT or ire_send_multirt_v6 already set a ttl,
631 * force the ttl to the IP_MULTICAST_TTL value
632 */
633 if (!(ixaflags & IXAF_NO_TTL_CHANGE)) {
634 ip6h->ip6_hops = ixa->ixa_multicast_ttl;
635 }
636
637 return (ire_send_wire_v6(ire, mp, ip6h, ixa, identp));
638 }
639
640 /*
641 * ire_sendfn for IREs with RTF_MULTIRT
642 */
643 int
ire_send_multirt_v6(ire_t * ire,mblk_t * mp,void * iph_arg,ip_xmit_attr_t * ixa,uint32_t * identp)644 ire_send_multirt_v6(ire_t *ire, mblk_t *mp, void *iph_arg,
645 ip_xmit_attr_t *ixa, uint32_t *identp)
646 {
647 ip6_t *ip6h = (ip6_t *)iph_arg;
648
649 multirt_check_v6(ire, ip6h, ixa);
650
651 if (ire->ire_type & IRE_MULTICAST)
652 return (ire_send_multicast_v6(ire, mp, ip6h, ixa, identp));
653 else
654 return (ire_send_wire_v6(ire, mp, ip6h, ixa, identp));
655 }
656
657 /*
658 * ire_sendfn for IREs with RTF_REJECT/RTF_BLACKHOLE, including IRE_NOROUTE
659 */
660 /* ARGSUSED4 */
661 int
ire_send_noroute_v6(ire_t * ire,mblk_t * mp,void * iph_arg,ip_xmit_attr_t * ixa,uint32_t * identp)662 ire_send_noroute_v6(ire_t *ire, mblk_t *mp, void *iph_arg,
663 ip_xmit_attr_t *ixa, uint32_t *identp)
664 {
665 ip6_t *ip6h = (ip6_t *)iph_arg;
666 ip_stack_t *ipst = ixa->ixa_ipst;
667 ill_t *ill;
668 ip_recv_attr_t iras;
669 boolean_t dummy;
670
671 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutNoRoutes);
672
673 if (ire->ire_type & IRE_NOROUTE) {
674 /* A lack of a route as opposed to RTF_REJECT|BLACKHOLE */
675 ip_rts_change_v6(RTM_MISS, &ip6h->ip6_dst, 0, 0, 0, 0, 0, 0,
676 RTA_DST, ipst);
677 }
678
679 if (ire->ire_flags & RTF_BLACKHOLE) {
680 ip_drop_output("ipIfStatsOutNoRoutes RTF_BLACKHOLE", mp, NULL);
681 freemsg(mp);
682 /* No error even for local senders - silent blackhole */
683 return (0);
684 }
685 ip_drop_output("ipIfStatsOutNoRoutes RTF_REJECT", mp, NULL);
686
687 /*
688 * We need an ill_t for the ip_recv_attr_t even though this packet
689 * was never received and icmp_unreachable doesn't currently use
690 * ira_ill.
691 */
692 ill = ill_lookup_on_name("lo0", B_FALSE,
693 !(ixa->ixa_flags & IRAF_IS_IPV4), &dummy, ipst);
694 if (ill == NULL) {
695 freemsg(mp);
696 return (EHOSTUNREACH);
697 }
698
699 bzero(&iras, sizeof (iras));
700 /* Map ixa to ira including IPsec policies */
701 ipsec_out_to_in(ixa, ill, &iras);
702
703 icmp_unreachable_v6(mp, ICMP6_DST_UNREACH_NOROUTE, B_FALSE, &iras);
704 /* We moved any IPsec refs from ixa to iras */
705 ira_cleanup(&iras, B_FALSE);
706
707 ill_refrele(ill);
708 return (EHOSTUNREACH);
709 }
710
711 /*
712 * Calculate a checksum ignoring any hardware capabilities
713 *
714 * Returns B_FALSE if the packet was too short for the checksum. Caller
715 * should free and do stats.
716 */
717 static boolean_t
ip_output_sw_cksum_v6(mblk_t * mp,ip6_t * ip6h,ip_xmit_attr_t * ixa)718 ip_output_sw_cksum_v6(mblk_t *mp, ip6_t *ip6h, ip_xmit_attr_t *ixa)
719 {
720 ip_stack_t *ipst = ixa->ixa_ipst;
721 uint_t pktlen = ixa->ixa_pktlen;
722 uint16_t *cksump;
723 uint32_t cksum;
724 uint8_t protocol = ixa->ixa_protocol;
725 uint16_t ip_hdr_length = ixa->ixa_ip_hdr_length;
726
727 #define iphs ((uint16_t *)ip6h)
728
729 /* Just in case it contained garbage */
730 DB_CKSUMFLAGS(mp) &= ~HCK_FLAGS;
731
732 /*
733 * Calculate ULP checksum
734 */
735 if (protocol == IPPROTO_TCP) {
736 cksump = IPH_TCPH_CHECKSUMP(ip6h, ip_hdr_length);
737 cksum = IP_TCP_CSUM_COMP;
738 } else if (protocol == IPPROTO_UDP) {
739 cksump = IPH_UDPH_CHECKSUMP(ip6h, ip_hdr_length);
740 cksum = IP_UDP_CSUM_COMP;
741 } else if (protocol == IPPROTO_SCTP) {
742 sctp_hdr_t *sctph;
743
744 ASSERT(MBLKL(mp) >= (ip_hdr_length + sizeof (*sctph)));
745 sctph = (sctp_hdr_t *)(mp->b_rptr + ip_hdr_length);
746 /*
747 * Zero out the checksum field to ensure proper
748 * checksum calculation.
749 */
750 sctph->sh_chksum = 0;
751 #ifdef DEBUG
752 if (!skip_sctp_cksum)
753 #endif
754 sctph->sh_chksum = sctp_cksum(mp, ip_hdr_length);
755 return (B_TRUE);
756 } else if (ixa->ixa_flags & IXAF_SET_RAW_CKSUM) {
757 /*
758 * icmp has placed length and routing
759 * header adjustment in the checksum field.
760 */
761 cksump = (uint16_t *)(((uint8_t *)ip6h) + ip_hdr_length +
762 ixa->ixa_raw_cksum_offset);
763 cksum = htons(protocol);
764 } else if (protocol == IPPROTO_ICMPV6) {
765 cksump = IPH_ICMPV6_CHECKSUMP(ip6h, ip_hdr_length);
766 cksum = IP_ICMPV6_CSUM_COMP; /* Pseudo-header cksum */
767 } else {
768 return (B_TRUE);
769 }
770
771 /* ULP puts the checksum field is in the first mblk */
772 ASSERT(((uchar_t *)cksump) + sizeof (uint16_t) <= mp->b_wptr);
773
774 /*
775 * We accumulate the pseudo header checksum in cksum.
776 * This is pretty hairy code, so watch close. One
777 * thing to keep in mind is that UDP and TCP have
778 * stored their respective datagram lengths in their
779 * checksum fields. This lines things up real nice.
780 */
781 cksum += iphs[4] + iphs[5] + iphs[6] + iphs[7] +
782 iphs[8] + iphs[9] + iphs[10] + iphs[11] +
783 iphs[12] + iphs[13] + iphs[14] + iphs[15] +
784 iphs[16] + iphs[17] + iphs[18] + iphs[19];
785 cksum = IP_CSUM(mp, ip_hdr_length, cksum);
786
787 /*
788 * For UDP/IPv6 a zero UDP checksum is not allowed.
789 * Change to 0xffff
790 */
791 if (protocol == IPPROTO_UDP && cksum == 0)
792 *cksump = ~cksum;
793 else
794 *cksump = cksum;
795
796 IP6_STAT(ipst, ip6_out_sw_cksum);
797 IP6_STAT_UPDATE(ipst, ip6_out_sw_cksum_bytes, pktlen);
798
799 /* No IP header checksum for IPv6 */
800
801 return (B_TRUE);
802 #undef iphs
803 }
804
805 /* There are drivers that can't do partial checksum for ICMPv6 */
806 int nxge_cksum_workaround = 1;
807
808 /*
809 * Calculate the ULP checksum - try to use hardware.
810 * In the case of MULTIRT or multicast the
811 * IXAF_NO_HW_CKSUM is set in which case we use software.
812 *
813 * Returns B_FALSE if the packet was too short for the checksum. Caller
814 * should free and do stats.
815 */
816 static boolean_t
ip_output_cksum_v6(iaflags_t ixaflags,mblk_t * mp,ip6_t * ip6h,ip_xmit_attr_t * ixa,ill_t * ill)817 ip_output_cksum_v6(iaflags_t ixaflags, mblk_t *mp, ip6_t *ip6h,
818 ip_xmit_attr_t *ixa, ill_t *ill)
819 {
820 uint_t pktlen = ixa->ixa_pktlen;
821 uint16_t *cksump;
822 uint16_t hck_flags;
823 uint32_t cksum;
824 uint8_t protocol = ixa->ixa_protocol;
825 uint16_t ip_hdr_length = ixa->ixa_ip_hdr_length;
826
827 #define iphs ((uint16_t *)ip6h)
828
829 if ((ixaflags & IXAF_NO_HW_CKSUM) || !ILL_HCKSUM_CAPABLE(ill) ||
830 !dohwcksum) {
831 return (ip_output_sw_cksum_v6(mp, ip6h, ixa));
832 }
833
834 /*
835 * Calculate ULP checksum. Note that we don't use cksump and cksum
836 * if the ill has FULL support.
837 */
838 if (protocol == IPPROTO_TCP) {
839 cksump = IPH_TCPH_CHECKSUMP(ip6h, ip_hdr_length);
840 cksum = IP_TCP_CSUM_COMP; /* Pseudo-header cksum */
841 } else if (protocol == IPPROTO_UDP) {
842 cksump = IPH_UDPH_CHECKSUMP(ip6h, ip_hdr_length);
843 cksum = IP_UDP_CSUM_COMP; /* Pseudo-header cksum */
844 } else if (protocol == IPPROTO_SCTP) {
845 sctp_hdr_t *sctph;
846
847 ASSERT(MBLKL(mp) >= (ip_hdr_length + sizeof (*sctph)));
848 sctph = (sctp_hdr_t *)(mp->b_rptr + ip_hdr_length);
849 /*
850 * Zero out the checksum field to ensure proper
851 * checksum calculation.
852 */
853 sctph->sh_chksum = 0;
854 #ifdef DEBUG
855 if (!skip_sctp_cksum)
856 #endif
857 sctph->sh_chksum = sctp_cksum(mp, ip_hdr_length);
858 goto ip_hdr_cksum;
859 } else if (ixa->ixa_flags & IXAF_SET_RAW_CKSUM) {
860 /*
861 * icmp has placed length and routing
862 * header adjustment in the checksum field.
863 */
864 cksump = (uint16_t *)(((uint8_t *)ip6h) + ip_hdr_length +
865 ixa->ixa_raw_cksum_offset);
866 cksum = htons(protocol);
867 } else if (protocol == IPPROTO_ICMPV6) {
868 cksump = IPH_ICMPV6_CHECKSUMP(ip6h, ip_hdr_length);
869 cksum = IP_ICMPV6_CSUM_COMP; /* Pseudo-header cksum */
870 } else {
871 ip_hdr_cksum:
872 /* No IP header checksum for IPv6 */
873 return (B_TRUE);
874 }
875
876 /* ULP puts the checksum field is in the first mblk */
877 ASSERT(((uchar_t *)cksump) + sizeof (uint16_t) <= mp->b_wptr);
878
879 /*
880 * Underlying interface supports hardware checksum offload for
881 * the payload; leave the payload checksum for the hardware to
882 * calculate. N.B: We only need to set up checksum info on the
883 * first mblk.
884 */
885 hck_flags = ill->ill_hcksum_capab->ill_hcksum_txflags;
886
887 DB_CKSUMFLAGS(mp) &= ~HCK_FLAGS;
888 if (hck_flags & HCKSUM_INET_FULL_V6) {
889 /*
890 * Hardware calculates pseudo-header, header and the
891 * payload checksums, so clear the checksum field in
892 * the protocol header.
893 */
894 *cksump = 0;
895 DB_CKSUMFLAGS(mp) |= HCK_FULLCKSUM;
896 return (B_TRUE);
897 }
898 if (((hck_flags) & HCKSUM_INET_PARTIAL) &&
899 (protocol != IPPROTO_ICMPV6 || !nxge_cksum_workaround)) {
900 /*
901 * Partial checksum offload has been enabled. Fill
902 * the checksum field in the protocol header with the
903 * pseudo-header checksum value.
904 *
905 * We accumulate the pseudo header checksum in cksum.
906 * This is pretty hairy code, so watch close. One
907 * thing to keep in mind is that UDP and TCP have
908 * stored their respective datagram lengths in their
909 * checksum fields. This lines things up real nice.
910 */
911 cksum += iphs[4] + iphs[5] + iphs[6] + iphs[7] +
912 iphs[8] + iphs[9] + iphs[10] + iphs[11] +
913 iphs[12] + iphs[13] + iphs[14] + iphs[15] +
914 iphs[16] + iphs[17] + iphs[18] + iphs[19];
915 cksum += *(cksump);
916 cksum = (cksum & 0xFFFF) + (cksum >> 16);
917 *(cksump) = (cksum & 0xFFFF) + (cksum >> 16);
918
919 /*
920 * Offsets are relative to beginning of IP header.
921 */
922 DB_CKSUMSTART(mp) = ip_hdr_length;
923 DB_CKSUMSTUFF(mp) = (uint8_t *)cksump - (uint8_t *)ip6h;
924 DB_CKSUMEND(mp) = pktlen;
925 DB_CKSUMFLAGS(mp) |= HCK_PARTIALCKSUM;
926 return (B_TRUE);
927 }
928 /* Hardware capabilities include neither full nor partial IPv6 */
929 return (ip_output_sw_cksum_v6(mp, ip6h, ixa));
930 #undef iphs
931 }
932
933 /*
934 * ire_sendfn for offlink and onlink destinations.
935 * Also called from the multicast, and multirt send functions.
936 *
937 * Assumes that the caller has a hold on the ire.
938 *
939 * This function doesn't care if the IRE just became condemned since that
940 * can happen at any time.
941 */
942 /* ARGSUSED */
943 int
ire_send_wire_v6(ire_t * ire,mblk_t * mp,void * iph_arg,ip_xmit_attr_t * ixa,uint32_t * identp)944 ire_send_wire_v6(ire_t *ire, mblk_t *mp, void *iph_arg,
945 ip_xmit_attr_t *ixa, uint32_t *identp)
946 {
947 ip_stack_t *ipst = ixa->ixa_ipst;
948 ip6_t *ip6h = (ip6_t *)iph_arg;
949 iaflags_t ixaflags = ixa->ixa_flags;
950 ill_t *ill;
951 uint32_t pktlen = ixa->ixa_pktlen;
952
953 ASSERT(ixa->ixa_nce != NULL);
954 ill = ixa->ixa_nce->nce_ill;
955
956 /*
957 * Update output mib stats. Note that we can't move into the icmp
958 * sender (icmp_output etc) since they don't know the ill and the
959 * stats are per ill.
960 *
961 * With IPMP we record the stats on the upper ill.
962 */
963 if (ixa->ixa_protocol == IPPROTO_ICMPV6) {
964 icmp6_t *icmp6;
965
966 icmp6 = (icmp6_t *)((uchar_t *)ip6h + ixa->ixa_ip_hdr_length);
967 icmp_update_out_mib_v6(ixa->ixa_nce->nce_common->ncec_ill,
968 icmp6);
969 }
970
971 if (ixaflags & IXAF_DONTROUTE)
972 ip6h->ip6_hops = 1;
973
974 /*
975 * This might set b_band, thus the IPsec and fragmentation
976 * code in IP ensures that b_band is updated in the first mblk.
977 */
978 if (IPP_ENABLED(IPP_LOCAL_OUT, ipst)) {
979 /* ip_process translates an IS_UNDER_IPMP */
980 mp = ip_process(IPP_LOCAL_OUT, mp, ill, ill);
981 if (mp == NULL) {
982 /* ip_drop_packet and MIB done */
983 return (0); /* Might just be delayed */
984 }
985 }
986
987 /*
988 * To handle IPsec/iptun's labeling needs we need to tag packets
989 * while we still have ixa_tsl
990 */
991 if (is_system_labeled() && ixa->ixa_tsl != NULL &&
992 (ill->ill_mactype == DL_6TO4 || ill->ill_mactype == DL_IPV4 ||
993 ill->ill_mactype == DL_IPV6)) {
994 cred_t *newcr;
995
996 newcr = copycred_from_tslabel(ixa->ixa_cred, ixa->ixa_tsl,
997 KM_NOSLEEP);
998 if (newcr == NULL) {
999 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
1000 ip_drop_output("ipIfStatsOutDiscards - newcr",
1001 mp, ill);
1002 freemsg(mp);
1003 return (ENOBUFS);
1004 }
1005 mblk_setcred(mp, newcr, NOPID);
1006 crfree(newcr); /* mblk_setcred did its own crhold */
1007 }
1008
1009 /*
1010 * IXAF_IPV6_ADD_FRAGHDR is set for CGTP so that we will add a
1011 * fragment header without fragmenting. CGTP on the receiver will
1012 * filter duplicates on the ident field.
1013 */
1014 if (pktlen > ixa->ixa_fragsize ||
1015 (ixaflags & (IXAF_IPSEC_SECURE|IXAF_IPV6_ADD_FRAGHDR))) {
1016 uint32_t ident;
1017
1018 if (ixaflags & IXAF_IPSEC_SECURE)
1019 pktlen += ipsec_out_extra_length(ixa);
1020
1021 if (pktlen > IP_MAXPACKET)
1022 return (EMSGSIZE);
1023
1024 if (ixaflags & IXAF_SET_ULP_CKSUM) {
1025 /*
1026 * Compute ULP checksum using software
1027 */
1028 if (!ip_output_sw_cksum_v6(mp, ip6h, ixa)) {
1029 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
1030 ip_drop_output("ipIfStatsOutDiscards", mp, ill);
1031 freemsg(mp);
1032 return (EINVAL);
1033 }
1034 /* Avoid checksum again below if we only add fraghdr */
1035 ixaflags &= ~IXAF_SET_ULP_CKSUM;
1036 }
1037
1038 /*
1039 * If we need a fragment header, pick the ident and insert
1040 * the header before IPsec to we have a place to store
1041 * the ident value.
1042 */
1043 if ((ixaflags & IXAF_IPV6_ADD_FRAGHDR) ||
1044 pktlen > ixa->ixa_fragsize) {
1045 /*
1046 * If this packet would generate a icmp_frag_needed
1047 * message, we need to handle it before we do the IPsec
1048 * processing. Otherwise, we need to strip the IPsec
1049 * headers before we send up the message to the ULPs
1050 * which becomes messy and difficult.
1051 */
1052 if ((pktlen > ixa->ixa_fragsize) &&
1053 (ixaflags & IXAF_DONTFRAG)) {
1054 /* Generate ICMP and return error */
1055 ip_recv_attr_t iras;
1056
1057 DTRACE_PROBE4(ip6__fragsize__fail,
1058 uint_t, pktlen, uint_t, ixa->ixa_fragsize,
1059 uint_t, ixa->ixa_pktlen,
1060 uint_t, ixa->ixa_pmtu);
1061
1062 bzero(&iras, sizeof (iras));
1063 /* Map ixa to ira including IPsec policies */
1064 ipsec_out_to_in(ixa, ill, &iras);
1065
1066 ip_drop_output("ICMP6_PKT_TOO_BIG", mp, ill);
1067 icmp_pkt2big_v6(mp, ixa->ixa_fragsize, B_TRUE,
1068 &iras);
1069 /* We moved any IPsec refs from ixa to iras */
1070 ira_cleanup(&iras, B_FALSE);
1071 return (EMSGSIZE);
1072 }
1073 DTRACE_PROBE4(ip6__fragsize__ok, uint_t, pktlen,
1074 uint_t, ixa->ixa_fragsize, uint_t, ixa->ixa_pktlen,
1075 uint_t, ixa->ixa_pmtu);
1076 /*
1077 * Assign an ident value for this packet. There could
1078 * be other threads targeting the same destination, so
1079 * we have to arrange for a atomic increment.
1080 * Normally ixa_extra_ident is 0, but in the case of
1081 * LSO it will be the number of TCP segments that the
1082 * driver/hardware will extraly construct.
1083 *
1084 * Note that cl_inet_ipident has only been used for
1085 * IPv4. We don't use it here.
1086 */
1087 ident = atomic_add_32_nv(identp, ixa->ixa_extra_ident +
1088 1);
1089 ixa->ixa_ident = ident; /* In case we do IPsec */
1090 }
1091 if (ixaflags & IXAF_IPSEC_SECURE) {
1092 /*
1093 * Pass in sufficient information so that
1094 * IPsec can determine whether to fragment, and
1095 * which function to call after fragmentation.
1096 */
1097 return (ipsec_out_process(mp, ixa));
1098 }
1099
1100 mp = ip_fraghdr_add_v6(mp, ident, ixa);
1101 if (mp == NULL) {
1102 /* MIB and ip_drop_output already done */
1103 return (ENOMEM);
1104 }
1105 ASSERT(pktlen == ixa->ixa_pktlen);
1106 pktlen += sizeof (ip6_frag_t);
1107
1108 if (pktlen > ixa->ixa_fragsize) {
1109 return (ip_fragment_v6(mp, ixa->ixa_nce, ixaflags,
1110 pktlen, ixa->ixa_fragsize,
1111 ixa->ixa_xmit_hint, ixa->ixa_zoneid,
1112 ixa->ixa_no_loop_zoneid, ixa->ixa_postfragfn,
1113 &ixa->ixa_cookie));
1114 }
1115 }
1116 if (ixaflags & IXAF_SET_ULP_CKSUM) {
1117 /* Compute ULP checksum and IP header checksum */
1118 /* An IS_UNDER_IPMP ill is ok here */
1119 if (!ip_output_cksum_v6(ixaflags, mp, ip6h, ixa, ill)) {
1120 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
1121 ip_drop_output("ipIfStatsOutDiscards", mp, ill);
1122 freemsg(mp);
1123 return (EINVAL);
1124 }
1125 }
1126 return ((ixa->ixa_postfragfn)(mp, ixa->ixa_nce, ixaflags,
1127 pktlen, ixa->ixa_xmit_hint, ixa->ixa_zoneid,
1128 ixa->ixa_no_loop_zoneid, &ixa->ixa_cookie));
1129 }
1130
1131 /*
1132 * Post fragmentation function for RTF_MULTIRT routes.
1133 * Since IRE_MULTICASTs might have RTF_MULTIRT, this function
1134 * checks IXAF_LOOPBACK_COPY.
1135 *
1136 * If no packet is sent due to failures then we return an errno, but if at
1137 * least one succeeded we return zero.
1138 */
1139 int
ip_postfrag_multirt_v6(mblk_t * mp,nce_t * nce,iaflags_t ixaflags,uint_t pkt_len,uint32_t xmit_hint,zoneid_t szone,zoneid_t nolzid,uintptr_t * ixacookie)1140 ip_postfrag_multirt_v6(mblk_t *mp, nce_t *nce, iaflags_t ixaflags,
1141 uint_t pkt_len, uint32_t xmit_hint, zoneid_t szone, zoneid_t nolzid,
1142 uintptr_t *ixacookie)
1143 {
1144 irb_t *irb;
1145 ip6_t *ip6h = (ip6_t *)mp->b_rptr;
1146 ire_t *ire;
1147 ire_t *ire1;
1148 mblk_t *mp1;
1149 nce_t *nce1;
1150 ill_t *ill = nce->nce_ill;
1151 ill_t *ill1;
1152 ip_stack_t *ipst = ill->ill_ipst;
1153 int error = 0;
1154 int num_sent = 0;
1155 int err;
1156 uint_t ire_type;
1157 in6_addr_t nexthop;
1158
1159 ASSERT(!(ixaflags & IXAF_IS_IPV4));
1160
1161 /* Check for IXAF_LOOPBACK_COPY */
1162 if (ixaflags & IXAF_LOOPBACK_COPY) {
1163 mblk_t *mp1;
1164
1165 mp1 = copymsg(mp);
1166 if (mp1 == NULL) {
1167 /* Failed to deliver the loopback copy. */
1168 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
1169 ip_drop_output("ipIfStatsOutDiscards", mp, ill);
1170 error = ENOBUFS;
1171 } else {
1172 ip_postfrag_loopback(mp1, nce, ixaflags, pkt_len,
1173 nolzid);
1174 }
1175 }
1176
1177 /*
1178 * Loop over RTF_MULTIRT for ip6_dst in the same bucket. Send
1179 * a copy to each one.
1180 * Use the nce (nexthop) and ip6_dst to find the ire.
1181 *
1182 * MULTIRT is not designed to work with shared-IP zones thus we don't
1183 * need to pass a zoneid or a label to the IRE lookup.
1184 */
1185 if (IN6_ARE_ADDR_EQUAL(&nce->nce_addr, &ip6h->ip6_dst)) {
1186 /* Broadcast and multicast case */
1187 ire = ire_ftable_lookup_v6(&ip6h->ip6_dst, 0, 0, 0, NULL,
1188 ALL_ZONES, NULL, MATCH_IRE_DSTONLY, 0, ipst, NULL);
1189 } else {
1190 /* Unicast case */
1191 ire = ire_ftable_lookup_v6(&ip6h->ip6_dst, 0, &nce->nce_addr,
1192 0, NULL, ALL_ZONES, NULL, MATCH_IRE_GW, 0, ipst, NULL);
1193 }
1194
1195 if (ire == NULL ||
1196 (ire->ire_flags & (RTF_REJECT|RTF_BLACKHOLE)) ||
1197 !(ire->ire_flags & RTF_MULTIRT)) {
1198 /* Drop */
1199 ip_drop_output("ip_postfrag_multirt didn't find route",
1200 mp, nce->nce_ill);
1201 if (ire != NULL)
1202 ire_refrele(ire);
1203 return (ENETUNREACH);
1204 }
1205
1206 irb = ire->ire_bucket;
1207 irb_refhold(irb);
1208 for (ire1 = irb->irb_ire; ire1 != NULL; ire1 = ire1->ire_next) {
1209 if (IRE_IS_CONDEMNED(ire1) ||
1210 !(ire1->ire_flags & RTF_MULTIRT))
1211 continue;
1212
1213 /* Note: When IPv6 uses radix tree we don't need this check */
1214 if (!IN6_ARE_ADDR_EQUAL(&ire->ire_addr_v6, &ire1->ire_addr_v6))
1215 continue;
1216
1217 /* Do the ire argument one after the loop */
1218 if (ire1 == ire)
1219 continue;
1220
1221 ill1 = ire_nexthop_ill(ire1);
1222 if (ill1 == NULL) {
1223 /*
1224 * This ire might not have been picked by
1225 * ire_route_recursive, in which case ire_dep might
1226 * not have been setup yet.
1227 * We kick ire_route_recursive to try to resolve
1228 * starting at ire1.
1229 */
1230 ire_t *ire2;
1231 uint_t match_flags = MATCH_IRE_DSTONLY;
1232
1233 if (ire1->ire_ill != NULL)
1234 match_flags |= MATCH_IRE_ILL;
1235 ire2 = ire_route_recursive_impl_v6(ire1,
1236 &ire1->ire_addr_v6, ire1->ire_type, ire1->ire_ill,
1237 ire1->ire_zoneid, NULL, match_flags,
1238 IRR_ALLOCATE, 0, ipst, NULL, NULL, NULL);
1239 if (ire2 != NULL)
1240 ire_refrele(ire2);
1241 ill1 = ire_nexthop_ill(ire1);
1242 }
1243 if (ill1 == NULL) {
1244 BUMP_MIB(ill->ill_ip_mib, ipIfStatsOutDiscards);
1245 ip_drop_output("ipIfStatsOutDiscards - no ill",
1246 mp, ill);
1247 error = ENETUNREACH;
1248 continue;
1249 }
1250 /* Pick the addr and type to use for ndp_nce_init */
1251 if (nce->nce_common->ncec_flags & NCE_F_MCAST) {
1252 ire_type = IRE_MULTICAST;
1253 nexthop = ip6h->ip6_dst;
1254 } else {
1255 ire_type = ire1->ire_type; /* Doesn't matter */
1256 nexthop = ire1->ire_gateway_addr_v6;
1257 }
1258
1259 /* If IPMP meta or under, then we just drop */
1260 if (ill1->ill_grp != NULL) {
1261 BUMP_MIB(ill1->ill_ip_mib, ipIfStatsOutDiscards);
1262 ip_drop_output("ipIfStatsOutDiscards - IPMP",
1263 mp, ill1);
1264 ill_refrele(ill1);
1265 error = ENETUNREACH;
1266 continue;
1267 }
1268
1269 nce1 = ndp_nce_init(ill1, &nexthop, ire_type);
1270 if (nce1 == NULL) {
1271 BUMP_MIB(ill1->ill_ip_mib, ipIfStatsOutDiscards);
1272 ip_drop_output("ipIfStatsOutDiscards - no nce",
1273 mp, ill1);
1274 ill_refrele(ill1);
1275 error = ENOBUFS;
1276 continue;
1277 }
1278 mp1 = copymsg(mp);
1279 if (mp1 == NULL) {
1280 BUMP_MIB(ill1->ill_ip_mib, ipIfStatsOutDiscards);
1281 ip_drop_output("ipIfStatsOutDiscards", mp, ill1);
1282 nce_refrele(nce1);
1283 ill_refrele(ill1);
1284 error = ENOBUFS;
1285 continue;
1286 }
1287 /* Preserve HW checksum for this copy */
1288 DB_CKSUMSTART(mp1) = DB_CKSUMSTART(mp);
1289 DB_CKSUMSTUFF(mp1) = DB_CKSUMSTUFF(mp);
1290 DB_CKSUMEND(mp1) = DB_CKSUMEND(mp);
1291 DB_CKSUMFLAGS(mp1) = DB_CKSUMFLAGS(mp);
1292 DB_LSOMSS(mp1) = DB_LSOMSS(mp);
1293
1294 ire1->ire_ob_pkt_count++;
1295 err = ip_xmit(mp1, nce1, ixaflags, pkt_len, xmit_hint, szone,
1296 0, ixacookie);
1297 if (err == 0)
1298 num_sent++;
1299 else
1300 error = err;
1301 nce_refrele(nce1);
1302 ill_refrele(ill1);
1303 }
1304 irb_refrele(irb);
1305 ire_refrele(ire);
1306 /* Finally, the main one */
1307 err = ip_xmit(mp, nce, ixaflags, pkt_len, xmit_hint, szone, 0,
1308 ixacookie);
1309 if (err == 0)
1310 num_sent++;
1311 else
1312 error = err;
1313 if (num_sent > 0)
1314 return (0);
1315 else
1316 return (error);
1317 }
1318