1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*-
33 * Copyright (c) 1982, 1986, 1988, 1993
34 * The Regents of the University of California.
35 * All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 */
61
62 #include <sys/cdefs.h>
63 #include "opt_ipsec.h"
64 #include "opt_inet6.h"
65 #include "opt_route.h"
66
67 #include <sys/param.h>
68 #include <sys/errno.h>
69 #include <sys/jail.h>
70 #include <sys/kernel.h>
71 #include <sys/lock.h>
72 #include <sys/malloc.h>
73 #include <sys/mbuf.h>
74 #include <sys/priv.h>
75 #include <sys/proc.h>
76 #include <sys/protosw.h>
77 #include <sys/signalvar.h>
78 #include <sys/socket.h>
79 #include <sys/socketvar.h>
80 #include <sys/sx.h>
81 #include <sys/syslog.h>
82
83 #include <net/if.h>
84 #include <net/if_var.h>
85 #include <net/if_private.h>
86 #include <net/if_types.h>
87 #include <net/route.h>
88 #include <net/vnet.h>
89
90 #include <netinet/in.h>
91 #include <netinet/in_var.h>
92 #include <netinet/in_systm.h>
93 #include <netinet/in_pcb.h>
94
95 #include <netinet/icmp6.h>
96 #include <netinet/ip6.h>
97 #include <netinet/ip_var.h>
98 #include <netinet6/ip6_mroute.h>
99 #include <netinet6/in6_pcb.h>
100 #include <netinet6/ip6_var.h>
101 #include <netinet6/nd6.h>
102 #include <netinet6/raw_ip6.h>
103 #include <netinet6/in6_fib.h>
104 #include <netinet6/scope6_var.h>
105 #include <netinet6/send.h>
106
107 #include <netipsec/ipsec_support.h>
108
109 #include <machine/stdarg.h>
110
111 #define satosin6(sa) ((struct sockaddr_in6 *)(sa))
112 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
113
114 /*
115 * Raw interface to IP6 protocol.
116 */
117
118 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
119 #define V_ripcbinfo VNET(ripcbinfo)
120
121 extern u_long rip_sendspace;
122 extern u_long rip_recvspace;
123
124 VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat);
125 VNET_PCPUSTAT_SYSINIT(rip6stat);
126
127 #ifdef VIMAGE
128 VNET_PCPUSTAT_SYSUNINIT(rip6stat);
129 #endif /* VIMAGE */
130
131 /*
132 * Hooks for multicast routing. They all default to NULL, so leave them not
133 * initialized and rely on BSS being set to 0.
134 */
135
136 /*
137 * The socket used to communicate with the multicast routing daemon.
138 */
139 VNET_DEFINE(struct socket *, ip6_mrouter);
140
141 /*
142 * The various mrouter functions.
143 */
144 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
145 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
146 int (*ip6_mrouter_done)(void);
147 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
148 int (*mrt6_ioctl)(u_long, caddr_t);
149
150 struct rip6_inp_match_ctx {
151 struct ip6_hdr *ip6;
152 int proto;
153 };
154
155 static bool
rip6_inp_match(const struct inpcb * inp,void * v)156 rip6_inp_match(const struct inpcb *inp, void *v)
157 {
158 struct rip6_inp_match_ctx *c = v;
159 struct ip6_hdr *ip6 = c->ip6;
160 int proto = c->proto;
161
162 /* XXX inp locking */
163 if ((inp->inp_vflag & INP_IPV6) == 0)
164 return (false);
165 if (inp->inp_ip_p && inp->inp_ip_p != proto)
166 return (false);
167 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
168 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
169 return (false);
170 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
171 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
172 return (false);
173
174 return (true);
175 }
176
177 /*
178 * Setup generic address and protocol structures for raw_input routine, then
179 * pass them along with mbuf chain.
180 */
181 int
rip6_input(struct mbuf ** mp,int * offp,int proto)182 rip6_input(struct mbuf **mp, int *offp, int proto)
183 {
184 struct ifnet *ifp;
185 struct mbuf *n, *m = *mp;
186 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
187 struct inpcb *inp;
188 struct mbuf *opts = NULL;
189 struct sockaddr_in6 fromsa;
190 struct rip6_inp_match_ctx ctx = { .ip6 = ip6, .proto = proto };
191 struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo,
192 INPLOOKUP_RLOCKPCB, rip6_inp_match, &ctx);
193 int delivered = 0;
194
195 NET_EPOCH_ASSERT();
196
197 RIP6STAT_INC(rip6s_ipackets);
198
199 init_sin6(&fromsa, m, 0); /* general init */
200
201 ifp = m->m_pkthdr.rcvif;
202
203 while ((inp = inp_next(&inpi)) != NULL) {
204 INP_RLOCK_ASSERT(inp);
205 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
206 /*
207 * Check AH/ESP integrity.
208 */
209 if (IPSEC_ENABLED(ipv6) &&
210 IPSEC_CHECK_POLICY(ipv6, m, inp) != 0) {
211 /* Do not inject data into pcb. */
212 continue;
213 }
214 #endif /* IPSEC */
215 if (jailed_without_vnet(inp->inp_cred) &&
216 !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
217 prison_check_ip6(inp->inp_cred, &ip6->ip6_dst) != 0)
218 /*
219 * Allow raw socket in jail to receive multicast;
220 * assume process had PRIV_NETINET_RAW at attach,
221 * and fall through into normal filter path if so.
222 */
223 continue;
224 if (inp->in6p_cksum != -1) {
225 RIP6STAT_INC(rip6s_isum);
226 if (m->m_pkthdr.len - (*offp + inp->in6p_cksum) < 2 ||
227 in6_cksum(m, proto, *offp,
228 m->m_pkthdr.len - *offp)) {
229 RIP6STAT_INC(rip6s_badsum);
230 /*
231 * Drop the received message, don't send an
232 * ICMP6 message. Set proto to IPPROTO_NONE
233 * to achieve that.
234 */
235 INP_RUNLOCK(inp);
236 proto = IPPROTO_NONE;
237 break;
238 }
239 }
240 /*
241 * If this raw socket has multicast state, and we
242 * have received a multicast, check if this socket
243 * should receive it, as multicast filtering is now
244 * the responsibility of the transport layer.
245 */
246 if (inp->in6p_moptions &&
247 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
248 /*
249 * If the incoming datagram is for MLD, allow it
250 * through unconditionally to the raw socket.
251 *
252 * Use the M_RTALERT_MLD flag to check for MLD
253 * traffic without having to inspect the mbuf chain
254 * more deeply, as all MLDv1/v2 host messages MUST
255 * contain the Router Alert option.
256 *
257 * In the case of MLDv1, we may not have explicitly
258 * joined the group, and may have set IFF_ALLMULTI
259 * on the interface. im6o_mc_filter() may discard
260 * control traffic we actually need to see.
261 *
262 * Userland multicast routing daemons should continue
263 * filter the control traffic appropriately.
264 */
265 int blocked;
266
267 blocked = MCAST_PASS;
268 if ((m->m_flags & M_RTALERT_MLD) == 0) {
269 struct sockaddr_in6 mcaddr;
270
271 bzero(&mcaddr, sizeof(struct sockaddr_in6));
272 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
273 mcaddr.sin6_family = AF_INET6;
274 mcaddr.sin6_addr = ip6->ip6_dst;
275
276 blocked = im6o_mc_filter(inp->in6p_moptions,
277 ifp,
278 (struct sockaddr *)&mcaddr,
279 (struct sockaddr *)&fromsa);
280 }
281 if (blocked != MCAST_PASS) {
282 IP6STAT_INC(ip6s_notmember);
283 continue;
284 }
285 }
286 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL)
287 continue;
288 if (inp->inp_flags & INP_CONTROLOPTS ||
289 inp->inp_socket->so_options & SO_TIMESTAMP)
290 ip6_savecontrol(inp, n, &opts);
291 /* strip intermediate headers */
292 m_adj(n, *offp);
293 if (sbappendaddr(&inp->inp_socket->so_rcv,
294 (struct sockaddr *)&fromsa, n, opts) == 0) {
295 soroverflow(inp->inp_socket);
296 m_freem(n);
297 if (opts)
298 m_freem(opts);
299 RIP6STAT_INC(rip6s_fullsock);
300 } else {
301 sorwakeup(inp->inp_socket);
302 delivered++;
303 }
304 opts = NULL;
305 }
306 if (delivered == 0) {
307 RIP6STAT_INC(rip6s_nosock);
308 if (m->m_flags & M_MCAST)
309 RIP6STAT_INC(rip6s_nosockmcast);
310 if (proto == IPPROTO_NONE)
311 m_freem(m);
312 else
313 icmp6_error(m, ICMP6_PARAM_PROB,
314 ICMP6_PARAMPROB_NEXTHEADER,
315 ip6_get_prevhdr(m, *offp));
316 IP6STAT_DEC(ip6s_delivered);
317 } else
318 m_freem(m);
319 return (IPPROTO_DONE);
320 }
321
322 void
rip6_ctlinput(struct ip6ctlparam * ip6cp)323 rip6_ctlinput(struct ip6ctlparam *ip6cp)
324 {
325 int errno;
326
327 if ((errno = icmp6_errmap(ip6cp->ip6c_icmp6)) != 0)
328 in6_pcbnotify(&V_ripcbinfo, ip6cp->ip6c_finaldst, 0,
329 ip6cp->ip6c_src, 0, errno, ip6cp->ip6c_cmdarg,
330 in6_rtchange);
331 }
332
333 /*
334 * Generate IPv6 header and pass packet to ip6_output. Tack on options user
335 * may have setup with control call.
336 */
337 static int
rip6_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct thread * td)338 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
339 struct mbuf *control, struct thread *td)
340 {
341 struct epoch_tracker et;
342 struct inpcb *inp;
343 struct sockaddr_in6 tmp, *dstsock;
344 struct m_tag *mtag;
345 struct ip6_hdr *ip6;
346 u_int plen = m->m_pkthdr.len;
347 struct ip6_pktopts opt, *optp;
348 struct ifnet *oifp = NULL;
349 int error;
350 int type = 0, code = 0; /* for ICMPv6 output statistics only */
351 int scope_ambiguous = 0;
352 int use_defzone = 0;
353 int hlim = 0;
354 struct in6_addr in6a;
355
356 inp = sotoinpcb(so);
357 KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
358
359 /* Always copy sockaddr to avoid overwrites. */
360 /* Unlocked read. */
361 if (so->so_state & SS_ISCONNECTED) {
362 if (nam) {
363 error = EISCONN;
364 goto release;
365 }
366 tmp = (struct sockaddr_in6 ){
367 .sin6_family = AF_INET6,
368 .sin6_len = sizeof(struct sockaddr_in6),
369 };
370 INP_RLOCK(inp);
371 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
372 sizeof(struct in6_addr));
373 INP_RUNLOCK(inp);
374 dstsock = &tmp;
375 } else {
376 if (nam == NULL)
377 error = ENOTCONN;
378 else if (nam->sa_family != AF_INET6)
379 error = EAFNOSUPPORT;
380 else if (nam->sa_len != sizeof(struct sockaddr_in6))
381 error = EINVAL;
382 else
383 error = 0;
384 if (error != 0)
385 goto release;
386 dstsock = (struct sockaddr_in6 *)nam;
387 if (dstsock->sin6_family != AF_INET6) {
388 error = EAFNOSUPPORT;
389 goto release;
390 }
391 }
392
393 INP_WLOCK(inp);
394
395 if (control != NULL) {
396 NET_EPOCH_ENTER(et);
397 error = ip6_setpktopts(control, &opt, inp->in6p_outputopts,
398 so->so_cred, inp->inp_ip_p);
399 NET_EPOCH_EXIT(et);
400
401 if (error != 0) {
402 goto bad;
403 }
404 optp = &opt;
405 } else
406 optp = inp->in6p_outputopts;
407
408 /*
409 * Check and convert scope zone ID into internal form.
410 *
411 * XXX: we may still need to determine the zone later.
412 */
413 if (!(so->so_state & SS_ISCONNECTED)) {
414 if (!optp || !optp->ip6po_pktinfo ||
415 !optp->ip6po_pktinfo->ipi6_ifindex)
416 use_defzone = V_ip6_use_defzone;
417 if (dstsock->sin6_scope_id == 0 && !use_defzone)
418 scope_ambiguous = 1;
419 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
420 goto bad;
421 }
422
423 /*
424 * For an ICMPv6 packet, we should know its type and code to update
425 * statistics.
426 */
427 if (inp->inp_ip_p == IPPROTO_ICMPV6) {
428 struct icmp6_hdr *icmp6;
429 if (m->m_len < sizeof(struct icmp6_hdr) &&
430 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
431 error = ENOBUFS;
432 goto bad;
433 }
434 icmp6 = mtod(m, struct icmp6_hdr *);
435 type = icmp6->icmp6_type;
436 code = icmp6->icmp6_code;
437 }
438
439 M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
440 if (m == NULL) {
441 error = ENOBUFS;
442 goto bad;
443 }
444 ip6 = mtod(m, struct ip6_hdr *);
445
446 #ifdef ROUTE_MPATH
447 if (CALC_FLOWID_OUTBOUND) {
448 uint32_t hash_type, hash_val;
449
450 hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
451 &dstsock->sin6_addr, 0, 0, inp->inp_ip_p, &hash_type);
452 inp->inp_flowid = hash_val;
453 inp->inp_flowtype = hash_type;
454 }
455 #endif
456 /*
457 * Source address selection.
458 */
459 NET_EPOCH_ENTER(et);
460 error = in6_selectsrc_socket(dstsock, optp, inp, so->so_cred,
461 scope_ambiguous, &in6a, &hlim);
462 NET_EPOCH_EXIT(et);
463
464 if (error)
465 goto bad;
466 error = prison_check_ip6(inp->inp_cred, &in6a);
467 if (error != 0)
468 goto bad;
469 ip6->ip6_src = in6a;
470
471 ip6->ip6_dst = dstsock->sin6_addr;
472
473 /*
474 * Fill in the rest of the IPv6 header fields.
475 */
476 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
477 (inp->inp_flow & IPV6_FLOWINFO_MASK);
478 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
479 (IPV6_VERSION & IPV6_VERSION_MASK);
480
481 /*
482 * ip6_plen will be filled in ip6_output, so not fill it here.
483 */
484 ip6->ip6_nxt = inp->inp_ip_p;
485 ip6->ip6_hlim = hlim;
486
487 if (inp->inp_ip_p == IPPROTO_ICMPV6 || inp->in6p_cksum != -1) {
488 struct mbuf *n;
489 int off;
490 u_int16_t *p;
491
492 /* Compute checksum. */
493 if (inp->inp_ip_p == IPPROTO_ICMPV6)
494 off = offsetof(struct icmp6_hdr, icmp6_cksum);
495 else
496 off = inp->in6p_cksum;
497 if (plen < off + 2) {
498 error = EINVAL;
499 goto bad;
500 }
501 off += sizeof(struct ip6_hdr);
502
503 n = m;
504 while (n && n->m_len <= off) {
505 off -= n->m_len;
506 n = n->m_next;
507 }
508 if (!n)
509 goto bad;
510 p = (u_int16_t *)(mtod(n, caddr_t) + off);
511 *p = 0;
512 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
513 }
514
515 /*
516 * Send RA/RS messages to user land for protection, before sending
517 * them to rtadvd/rtsol.
518 */
519 if ((send_sendso_input_hook != NULL) &&
520 inp->inp_ip_p == IPPROTO_ICMPV6) {
521 switch (type) {
522 case ND_ROUTER_ADVERT:
523 case ND_ROUTER_SOLICIT:
524 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
525 sizeof(unsigned short), M_NOWAIT);
526 if (mtag == NULL)
527 goto bad;
528 m_tag_prepend(m, mtag);
529 }
530 }
531
532 NET_EPOCH_ENTER(et);
533 error = ip6_output(m, optp, NULL, 0, inp->in6p_moptions, &oifp, inp);
534 NET_EPOCH_EXIT(et);
535 if (inp->inp_ip_p == IPPROTO_ICMPV6) {
536 if (oifp)
537 icmp6_ifoutstat_inc(oifp, type, code);
538 ICMP6STAT_INC2(icp6s_outhist, type);
539 } else
540 RIP6STAT_INC(rip6s_opackets);
541
542 goto freectl;
543
544 bad:
545 if (m)
546 m_freem(m);
547
548 freectl:
549 if (control != NULL) {
550 ip6_clearpktopts(&opt, -1);
551 m_freem(control);
552 }
553 INP_WUNLOCK(inp);
554 return (error);
555
556 release:
557 if (control != NULL)
558 m_freem(control);
559 m_freem(m);
560 return (error);
561 }
562
563 /*
564 * Raw IPv6 socket option processing.
565 */
566 int
rip6_ctloutput(struct socket * so,struct sockopt * sopt)567 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
568 {
569 struct inpcb *inp = sotoinpcb(so);
570 int error;
571
572 if (sopt->sopt_level == IPPROTO_ICMPV6)
573 /*
574 * XXX: is it better to call icmp6_ctloutput() directly
575 * from protosw?
576 */
577 return (icmp6_ctloutput(so, sopt));
578 else if (sopt->sopt_level != IPPROTO_IPV6) {
579 if (sopt->sopt_level == SOL_SOCKET &&
580 sopt->sopt_name == SO_SETFIB) {
581 INP_WLOCK(inp);
582 inp->inp_inc.inc_fibnum = so->so_fibnum;
583 INP_WUNLOCK(inp);
584 return (0);
585 }
586 return (EINVAL);
587 }
588
589 error = 0;
590
591 switch (sopt->sopt_dir) {
592 case SOPT_GET:
593 switch (sopt->sopt_name) {
594 case MRT6_INIT:
595 case MRT6_DONE:
596 case MRT6_ADD_MIF:
597 case MRT6_DEL_MIF:
598 case MRT6_ADD_MFC:
599 case MRT6_DEL_MFC:
600 case MRT6_PIM:
601 if (inp->inp_ip_p != IPPROTO_ICMPV6)
602 return (EOPNOTSUPP);
603 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) :
604 EOPNOTSUPP;
605 break;
606 case IPV6_CHECKSUM:
607 error = ip6_raw_ctloutput(so, sopt);
608 break;
609 default:
610 error = ip6_ctloutput(so, sopt);
611 break;
612 }
613 break;
614
615 case SOPT_SET:
616 switch (sopt->sopt_name) {
617 case MRT6_INIT:
618 case MRT6_DONE:
619 case MRT6_ADD_MIF:
620 case MRT6_DEL_MIF:
621 case MRT6_ADD_MFC:
622 case MRT6_DEL_MFC:
623 case MRT6_PIM:
624 if (inp->inp_ip_p != IPPROTO_ICMPV6)
625 return (EOPNOTSUPP);
626 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) :
627 EOPNOTSUPP;
628 break;
629 case IPV6_CHECKSUM:
630 error = ip6_raw_ctloutput(so, sopt);
631 break;
632 default:
633 error = ip6_ctloutput(so, sopt);
634 break;
635 }
636 break;
637 }
638
639 return (error);
640 }
641
642 static int
rip6_attach(struct socket * so,int proto,struct thread * td)643 rip6_attach(struct socket *so, int proto, struct thread *td)
644 {
645 struct inpcb *inp;
646 struct icmp6_filter *filter;
647 int error;
648
649 inp = sotoinpcb(so);
650 KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
651
652 error = priv_check(td, PRIV_NETINET_RAW);
653 if (error)
654 return (error);
655 if (proto >= IPPROTO_MAX || proto < 0)
656 return (EPROTONOSUPPORT);
657 error = soreserve(so, rip_sendspace, rip_recvspace);
658 if (error)
659 return (error);
660 filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
661 if (filter == NULL)
662 return (ENOMEM);
663 error = in_pcballoc(so, &V_ripcbinfo);
664 if (error) {
665 free(filter, M_PCB);
666 return (error);
667 }
668 inp = (struct inpcb *)so->so_pcb;
669 inp->inp_ip_p = proto;
670 inp->in6p_cksum = -1;
671 inp->in6p_icmp6filt = filter;
672 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
673 INP_WUNLOCK(inp);
674 return (0);
675 }
676
677 static void
rip6_detach(struct socket * so)678 rip6_detach(struct socket *so)
679 {
680 struct inpcb *inp;
681
682 inp = sotoinpcb(so);
683 KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
684
685 if (so == V_ip6_mrouter && ip6_mrouter_done)
686 ip6_mrouter_done();
687 /* xxx: RSVP */
688 INP_WLOCK(inp);
689 free(inp->in6p_icmp6filt, M_PCB);
690 in_pcbfree(inp);
691 }
692
693 /* XXXRW: This can't ever be called. */
694 static void
rip6_abort(struct socket * so)695 rip6_abort(struct socket *so)
696 {
697 struct inpcb *inp __diagused;
698
699 inp = sotoinpcb(so);
700 KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
701
702 soisdisconnected(so);
703 }
704
705 static void
rip6_close(struct socket * so)706 rip6_close(struct socket *so)
707 {
708 struct inpcb *inp __diagused;
709
710 inp = sotoinpcb(so);
711 KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
712
713 soisdisconnected(so);
714 }
715
716 static int
rip6_disconnect(struct socket * so)717 rip6_disconnect(struct socket *so)
718 {
719 struct inpcb *inp;
720
721 inp = sotoinpcb(so);
722 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
723
724 if ((so->so_state & SS_ISCONNECTED) == 0)
725 return (ENOTCONN);
726 inp->in6p_faddr = in6addr_any;
727 rip6_abort(so);
728 return (0);
729 }
730
731 static int
rip6_bind(struct socket * so,struct sockaddr * nam,struct thread * td)732 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
733 {
734 struct epoch_tracker et;
735 struct inpcb *inp;
736 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
737 struct ifaddr *ifa = NULL;
738 int error = 0;
739
740 inp = sotoinpcb(so);
741 KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
742
743 if (nam->sa_family != AF_INET6)
744 return (EAFNOSUPPORT);
745 if (nam->sa_len != sizeof(*addr))
746 return (EINVAL);
747 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
748 return (error);
749 if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
750 return (EADDRNOTAVAIL);
751 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
752 return (error);
753
754 NET_EPOCH_ENTER(et);
755 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
756 (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
757 NET_EPOCH_EXIT(et);
758 return (EADDRNOTAVAIL);
759 }
760 if (ifa != NULL &&
761 ((struct in6_ifaddr *)ifa)->ia6_flags &
762 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
763 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
764 NET_EPOCH_EXIT(et);
765 return (EADDRNOTAVAIL);
766 }
767 NET_EPOCH_EXIT(et);
768 INP_WLOCK(inp);
769 INP_INFO_WLOCK(&V_ripcbinfo);
770 inp->in6p_laddr = addr->sin6_addr;
771 INP_INFO_WUNLOCK(&V_ripcbinfo);
772 INP_WUNLOCK(inp);
773 return (0);
774 }
775
776 static int
rip6_connect(struct socket * so,struct sockaddr * nam,struct thread * td)777 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
778 {
779 struct inpcb *inp;
780 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
781 struct in6_addr in6a;
782 struct epoch_tracker et;
783 int error = 0, scope_ambiguous = 0;
784
785 inp = sotoinpcb(so);
786 KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
787
788 if (nam->sa_len != sizeof(*addr))
789 return (EINVAL);
790 if (CK_STAILQ_EMPTY(&V_ifnet))
791 return (EADDRNOTAVAIL);
792 if (addr->sin6_family != AF_INET6)
793 return (EAFNOSUPPORT);
794
795 /*
796 * Application should provide a proper zone ID or the use of default
797 * zone IDs should be enabled. Unfortunately, some applications do
798 * not behave as it should, so we need a workaround. Even if an
799 * appropriate ID is not determined, we'll see if we can determine
800 * the outgoing interface. If we can, determine the zone ID based on
801 * the interface below.
802 */
803 if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
804 scope_ambiguous = 1;
805 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
806 return (error);
807
808 INP_WLOCK(inp);
809 INP_INFO_WLOCK(&V_ripcbinfo);
810 /* Source address selection. XXX: need pcblookup? */
811 NET_EPOCH_ENTER(et);
812 error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
813 inp, so->so_cred, scope_ambiguous, &in6a, NULL);
814 NET_EPOCH_EXIT(et);
815 if (error) {
816 INP_INFO_WUNLOCK(&V_ripcbinfo);
817 INP_WUNLOCK(inp);
818 return (error);
819 }
820
821 inp->in6p_faddr = addr->sin6_addr;
822 inp->in6p_laddr = in6a;
823 soisconnected(so);
824 INP_INFO_WUNLOCK(&V_ripcbinfo);
825 INP_WUNLOCK(inp);
826 return (0);
827 }
828
829 static int
rip6_shutdown(struct socket * so,enum shutdown_how how)830 rip6_shutdown(struct socket *so, enum shutdown_how how)
831 {
832
833 SOCK_LOCK(so);
834 if (!(so->so_state & SS_ISCONNECTED)) {
835 SOCK_UNLOCK(so);
836 return (ENOTCONN);
837 }
838 SOCK_UNLOCK(so);
839
840 switch (how) {
841 case SHUT_RD:
842 sorflush(so);
843 break;
844 case SHUT_RDWR:
845 sorflush(so);
846 /* FALLTHROUGH */
847 case SHUT_WR:
848 socantsendmore(so);
849 }
850
851 return (0);
852 }
853
854 struct protosw rip6_protosw = {
855 .pr_type = SOCK_RAW,
856 .pr_flags = PR_ATOMIC|PR_ADDR,
857 .pr_ctloutput = rip6_ctloutput,
858 .pr_abort = rip6_abort,
859 .pr_attach = rip6_attach,
860 .pr_bind = rip6_bind,
861 .pr_connect = rip6_connect,
862 .pr_control = in6_control,
863 .pr_detach = rip6_detach,
864 .pr_disconnect = rip6_disconnect,
865 .pr_peeraddr = in6_getpeeraddr,
866 .pr_send = rip6_send,
867 .pr_shutdown = rip6_shutdown,
868 .pr_sockaddr = in6_getsockaddr,
869 .pr_close = rip6_close
870 };
871