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 * @(#)raw_ip.c 8.2 (Berkeley) 1/4/94
62 */
63
64 #include <sys/cdefs.h>
65 __FBSDID("$FreeBSD: releng/12.0/sys/netinet6/raw_ip6.c 339950 2018-10-31 12:49:18Z bz $");
66
67 #include "opt_ipsec.h"
68 #include "opt_inet6.h"
69
70 #include <sys/param.h>
71 #include <sys/errno.h>
72 #include <sys/jail.h>
73 #include <sys/kernel.h>
74 #include <sys/lock.h>
75 #include <sys/malloc.h>
76 #include <sys/mbuf.h>
77 #include <sys/priv.h>
78 #include <sys/proc.h>
79 #include <sys/protosw.h>
80 #include <sys/signalvar.h>
81 #include <sys/socket.h>
82 #include <sys/socketvar.h>
83 #include <sys/sx.h>
84 #include <sys/syslog.h>
85
86 #include <net/if.h>
87 #include <net/if_var.h>
88 #include <net/if_types.h>
89 #include <net/route.h>
90 #include <net/vnet.h>
91
92 #include <netinet/in.h>
93 #include <netinet/in_var.h>
94 #include <netinet/in_systm.h>
95 #include <netinet/in_pcb.h>
96
97 #include <netinet/icmp6.h>
98 #include <netinet/ip6.h>
99 #include <netinet/ip_var.h>
100 #include <netinet6/ip6protosw.h>
101 #include <netinet6/ip6_mroute.h>
102 #include <netinet6/in6_pcb.h>
103 #include <netinet6/ip6_var.h>
104 #include <netinet6/nd6.h>
105 #include <netinet6/raw_ip6.h>
106 #include <netinet6/scope6_var.h>
107 #include <netinet6/send.h>
108
109 #include <netipsec/ipsec_support.h>
110
111 #include <machine/stdarg.h>
112
113 #define satosin6(sa) ((struct sockaddr_in6 *)(sa))
114 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
115
116 /*
117 * Raw interface to IP6 protocol.
118 */
119
120 VNET_DECLARE(struct inpcbhead, ripcb);
121 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
122 #define V_ripcb VNET(ripcb)
123 #define V_ripcbinfo VNET(ripcbinfo)
124
125 extern u_long rip_sendspace;
126 extern u_long rip_recvspace;
127
128 VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat);
129 VNET_PCPUSTAT_SYSINIT(rip6stat);
130
131 #ifdef VIMAGE
132 VNET_PCPUSTAT_SYSUNINIT(rip6stat);
133 #endif /* VIMAGE */
134
135 /*
136 * Hooks for multicast routing. They all default to NULL, so leave them not
137 * initialized and rely on BSS being set to 0.
138 */
139
140 /*
141 * The socket used to communicate with the multicast routing daemon.
142 */
143 VNET_DEFINE(struct socket *, ip6_mrouter);
144
145 /*
146 * The various mrouter functions.
147 */
148 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
149 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
150 int (*ip6_mrouter_done)(void);
151 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
152 int (*mrt6_ioctl)(u_long, caddr_t);
153
154 /*
155 * Setup generic address and protocol structures for raw_input routine, then
156 * pass them along with mbuf chain.
157 */
158 int
159 rip6_input(struct mbuf **mp, int *offp, int proto)
160 {
161 struct ifnet *ifp;
162 struct mbuf *m = *mp;
163 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
164 struct inpcb *in6p;
165 struct inpcb *last = NULL;
166 struct mbuf *opts = NULL;
167 struct sockaddr_in6 fromsa;
168 struct epoch_tracker et;
169
170 RIP6STAT_INC(rip6s_ipackets);
171
172 init_sin6(&fromsa, m, 0); /* general init */
173
174 ifp = m->m_pkthdr.rcvif;
175
176 INP_INFO_RLOCK_ET(&V_ripcbinfo, et);
177 CK_LIST_FOREACH(in6p, &V_ripcb, inp_list) {
178 /* XXX inp locking */
179 if ((in6p->inp_vflag & INP_IPV6) == 0)
180 continue;
181 if (in6p->inp_ip_p &&
182 in6p->inp_ip_p != proto)
183 continue;
184 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
185 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
186 continue;
187 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
188 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
189 continue;
190 if (last != NULL) {
191 struct mbuf *n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
192
193 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
194 /*
195 * Check AH/ESP integrity.
196 */
197 if (IPSEC_ENABLED(ipv6)) {
198 if (n != NULL &&
199 IPSEC_CHECK_POLICY(ipv6, n, last) != 0) {
200 m_freem(n);
201 /* Do not inject data into pcb. */
202 n = NULL;
203 }
204 }
205 #endif /* IPSEC */
206 if (n) {
207 if (last->inp_flags & INP_CONTROLOPTS ||
208 last->inp_socket->so_options & SO_TIMESTAMP)
209 ip6_savecontrol(last, n, &opts);
210 /* strip intermediate headers */
211 m_adj(n, *offp);
212 if (sbappendaddr(&last->inp_socket->so_rcv,
213 (struct sockaddr *)&fromsa,
214 n, opts) == 0) {
215 m_freem(n);
216 if (opts)
217 m_freem(opts);
218 RIP6STAT_INC(rip6s_fullsock);
219 } else
220 sorwakeup(last->inp_socket);
221 opts = NULL;
222 }
223 INP_RUNLOCK(last);
224 last = NULL;
225 }
226 INP_RLOCK(in6p);
227 if (__predict_false(in6p->inp_flags2 & INP_FREED))
228 goto skip_2;
229 if (jailed_without_vnet(in6p->inp_cred)) {
230 /*
231 * Allow raw socket in jail to receive multicast;
232 * assume process had PRIV_NETINET_RAW at attach,
233 * and fall through into normal filter path if so.
234 */
235 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
236 prison_check_ip6(in6p->inp_cred,
237 &ip6->ip6_dst) != 0)
238 goto skip_2;
239 }
240 if (in6p->in6p_cksum != -1) {
241 RIP6STAT_INC(rip6s_isum);
242 if (in6_cksum(m, proto, *offp,
243 m->m_pkthdr.len - *offp)) {
244 RIP6STAT_INC(rip6s_badsum);
245 goto skip_2;
246 }
247 }
248 /*
249 * If this raw socket has multicast state, and we
250 * have received a multicast, check if this socket
251 * should receive it, as multicast filtering is now
252 * the responsibility of the transport layer.
253 */
254 if (in6p->in6p_moptions &&
255 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
256 /*
257 * If the incoming datagram is for MLD, allow it
258 * through unconditionally to the raw socket.
259 *
260 * Use the M_RTALERT_MLD flag to check for MLD
261 * traffic without having to inspect the mbuf chain
262 * more deeply, as all MLDv1/v2 host messages MUST
263 * contain the Router Alert option.
264 *
265 * In the case of MLDv1, we may not have explicitly
266 * joined the group, and may have set IFF_ALLMULTI
267 * on the interface. im6o_mc_filter() may discard
268 * control traffic we actually need to see.
269 *
270 * Userland multicast routing daemons should continue
271 * filter the control traffic appropriately.
272 */
273 int blocked;
274
275 blocked = MCAST_PASS;
276 if ((m->m_flags & M_RTALERT_MLD) == 0) {
277 struct sockaddr_in6 mcaddr;
278
279 bzero(&mcaddr, sizeof(struct sockaddr_in6));
280 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
281 mcaddr.sin6_family = AF_INET6;
282 mcaddr.sin6_addr = ip6->ip6_dst;
283
284 blocked = im6o_mc_filter(in6p->in6p_moptions,
285 ifp,
286 (struct sockaddr *)&mcaddr,
287 (struct sockaddr *)&fromsa);
288 }
289 if (blocked != MCAST_PASS) {
290 IP6STAT_INC(ip6s_notmember);
291 goto skip_2;
292 }
293 }
294 last = in6p;
295 continue;
296 skip_2:
297 INP_RUNLOCK(in6p);
298 }
299 INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et);
300 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
301 /*
302 * Check AH/ESP integrity.
303 */
304 if (IPSEC_ENABLED(ipv6) && last != NULL &&
305 IPSEC_CHECK_POLICY(ipv6, m, last) != 0) {
306 m_freem(m);
307 IP6STAT_DEC(ip6s_delivered);
308 /* Do not inject data into pcb. */
309 INP_RUNLOCK(last);
310 } else
311 #endif /* IPSEC */
312 if (last != NULL) {
313 if (last->inp_flags & INP_CONTROLOPTS ||
314 last->inp_socket->so_options & SO_TIMESTAMP)
315 ip6_savecontrol(last, m, &opts);
316 /* Strip intermediate headers. */
317 m_adj(m, *offp);
318 if (sbappendaddr(&last->inp_socket->so_rcv,
319 (struct sockaddr *)&fromsa, m, opts) == 0) {
320 m_freem(m);
321 if (opts)
322 m_freem(opts);
323 RIP6STAT_INC(rip6s_fullsock);
324 } else
325 sorwakeup(last->inp_socket);
326 INP_RUNLOCK(last);
327 } else {
328 RIP6STAT_INC(rip6s_nosock);
329 if (m->m_flags & M_MCAST)
330 RIP6STAT_INC(rip6s_nosockmcast);
331 if (proto == IPPROTO_NONE)
332 m_freem(m);
333 else
334 icmp6_error(m, ICMP6_PARAM_PROB,
335 ICMP6_PARAMPROB_NEXTHEADER,
336 ip6_get_prevhdr(m, *offp));
337 IP6STAT_DEC(ip6s_delivered);
338 }
339 return (IPPROTO_DONE);
340 }
341
342 void
343 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
344 {
345 struct ip6ctlparam *ip6cp = NULL;
346 const struct sockaddr_in6 *sa6_src = NULL;
347 void *cmdarg;
348 struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
349
350 if (sa->sa_family != AF_INET6 ||
351 sa->sa_len != sizeof(struct sockaddr_in6))
352 return;
353
354 if ((unsigned)cmd >= PRC_NCMDS)
355 return;
356 if (PRC_IS_REDIRECT(cmd))
357 notify = in6_rtchange, d = NULL;
358 else if (cmd == PRC_HOSTDEAD)
359 d = NULL;
360 else if (inet6ctlerrmap[cmd] == 0)
361 return;
362
363 /*
364 * If the parameter is from icmp6, decode it.
365 */
366 if (d != NULL) {
367 ip6cp = (struct ip6ctlparam *)d;
368 cmdarg = ip6cp->ip6c_cmdarg;
369 sa6_src = ip6cp->ip6c_src;
370 } else {
371 cmdarg = NULL;
372 sa6_src = &sa6_any;
373 }
374
375 (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
376 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
377 }
378
379 /*
380 * Generate IPv6 header and pass packet to ip6_output. Tack on options user
381 * may have setup with control call.
382 */
383 int
384 rip6_output(struct mbuf *m, struct socket *so, ...)
385 {
386 struct mbuf *control;
387 struct m_tag *mtag;
388 struct sockaddr_in6 *dstsock;
389 struct ip6_hdr *ip6;
390 struct inpcb *in6p;
391 u_int plen = m->m_pkthdr.len;
392 int error = 0;
393 struct ip6_pktopts opt, *optp;
394 struct ifnet *oifp = NULL;
395 int type = 0, code = 0; /* for ICMPv6 output statistics only */
396 int scope_ambiguous = 0;
397 int use_defzone = 0;
398 int hlim = 0;
399 struct in6_addr in6a;
400 va_list ap;
401
402 va_start(ap, so);
403 dstsock = va_arg(ap, struct sockaddr_in6 *);
404 control = va_arg(ap, struct mbuf *);
405 va_end(ap);
406
407 in6p = sotoinpcb(so);
408 INP_WLOCK(in6p);
409
410 if (control != NULL) {
411 if ((error = ip6_setpktopts(control, &opt,
412 in6p->in6p_outputopts, so->so_cred,
413 so->so_proto->pr_protocol)) != 0) {
414 goto bad;
415 }
416 optp = &opt;
417 } else
418 optp = in6p->in6p_outputopts;
419
420 /*
421 * Check and convert scope zone ID into internal form.
422 *
423 * XXX: we may still need to determine the zone later.
424 */
425 if (!(so->so_state & SS_ISCONNECTED)) {
426 if (!optp || !optp->ip6po_pktinfo ||
427 !optp->ip6po_pktinfo->ipi6_ifindex)
428 use_defzone = V_ip6_use_defzone;
429 if (dstsock->sin6_scope_id == 0 && !use_defzone)
430 scope_ambiguous = 1;
431 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
432 goto bad;
433 }
434
435 /*
436 * For an ICMPv6 packet, we should know its type and code to update
437 * statistics.
438 */
439 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
440 struct icmp6_hdr *icmp6;
441 if (m->m_len < sizeof(struct icmp6_hdr) &&
442 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
443 error = ENOBUFS;
444 goto bad;
445 }
446 icmp6 = mtod(m, struct icmp6_hdr *);
447 type = icmp6->icmp6_type;
448 code = icmp6->icmp6_code;
449 }
450
451 M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
452 if (m == NULL) {
453 error = ENOBUFS;
454 goto bad;
455 }
456 ip6 = mtod(m, struct ip6_hdr *);
457
458 /*
459 * Source address selection.
460 */
461 error = in6_selectsrc_socket(dstsock, optp, in6p, so->so_cred,
462 scope_ambiguous, &in6a, &hlim);
463
464 if (error)
465 goto bad;
466 error = prison_check_ip6(in6p->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 (in6p->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 = in6p->inp_ip_p;
485 ip6->ip6_hlim = hlim;
486
487 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
488 in6p->in6p_cksum != -1) {
489 struct mbuf *n;
490 int off;
491 u_int16_t *p;
492
493 /* Compute checksum. */
494 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
495 off = offsetof(struct icmp6_hdr, icmp6_cksum);
496 else
497 off = in6p->in6p_cksum;
498 if (plen < off + 1) {
499 error = EINVAL;
500 goto bad;
501 }
502 off += sizeof(struct ip6_hdr);
503
504 n = m;
505 while (n && n->m_len <= off) {
506 off -= n->m_len;
507 n = n->m_next;
508 }
509 if (!n)
510 goto bad;
511 p = (u_int16_t *)(mtod(n, caddr_t) + off);
512 *p = 0;
513 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
514 }
515
516 /*
517 * Send RA/RS messages to user land for protection, before sending
518 * them to rtadvd/rtsol.
519 */
520 if ((send_sendso_input_hook != NULL) &&
521 so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
522 switch (type) {
523 case ND_ROUTER_ADVERT:
524 case ND_ROUTER_SOLICIT:
525 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
526 sizeof(unsigned short), M_NOWAIT);
527 if (mtag == NULL)
528 goto bad;
529 m_tag_prepend(m, mtag);
530 }
531 }
532
533 error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
534 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
535 if (oifp)
536 icmp6_ifoutstat_inc(oifp, type, code);
537 ICMP6STAT_INC(icp6s_outhist[type]);
538 } else
539 RIP6STAT_INC(rip6s_opackets);
540
541 goto freectl;
542
543 bad:
544 if (m)
545 m_freem(m);
546
547 freectl:
548 if (control != NULL) {
549 ip6_clearpktopts(&opt, -1);
550 m_freem(control);
551 }
552 INP_WUNLOCK(in6p);
553 return (error);
554 }
555
556 /*
557 * Raw IPv6 socket option processing.
558 */
559 int
560 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
561 {
562 struct inpcb *inp;
563 int error;
564
565 if (sopt->sopt_level == IPPROTO_ICMPV6)
566 /*
567 * XXX: is it better to call icmp6_ctloutput() directly
568 * from protosw?
569 */
570 return (icmp6_ctloutput(so, sopt));
571 else if (sopt->sopt_level != IPPROTO_IPV6) {
572 if (sopt->sopt_level == SOL_SOCKET &&
573 sopt->sopt_name == SO_SETFIB) {
574 inp = sotoinpcb(so);
575 INP_WLOCK(inp);
576 inp->inp_inc.inc_fibnum = so->so_fibnum;
577 INP_WUNLOCK(inp);
578 return (0);
579 }
580 return (EINVAL);
581 }
582
583 error = 0;
584
585 switch (sopt->sopt_dir) {
586 case SOPT_GET:
587 switch (sopt->sopt_name) {
588 case MRT6_INIT:
589 case MRT6_DONE:
590 case MRT6_ADD_MIF:
591 case MRT6_DEL_MIF:
592 case MRT6_ADD_MFC:
593 case MRT6_DEL_MFC:
594 case MRT6_PIM:
595 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) :
596 EOPNOTSUPP;
597 break;
598 case IPV6_CHECKSUM:
599 error = ip6_raw_ctloutput(so, sopt);
600 break;
601 default:
602 error = ip6_ctloutput(so, sopt);
603 break;
604 }
605 break;
606
607 case SOPT_SET:
608 switch (sopt->sopt_name) {
609 case MRT6_INIT:
610 case MRT6_DONE:
611 case MRT6_ADD_MIF:
612 case MRT6_DEL_MIF:
613 case MRT6_ADD_MFC:
614 case MRT6_DEL_MFC:
615 case MRT6_PIM:
616 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) :
617 EOPNOTSUPP;
618 break;
619 case IPV6_CHECKSUM:
620 error = ip6_raw_ctloutput(so, sopt);
621 break;
622 default:
623 error = ip6_ctloutput(so, sopt);
624 break;
625 }
626 break;
627 }
628
629 return (error);
630 }
631
632 static int
633 rip6_attach(struct socket *so, int proto, struct thread *td)
634 {
635 struct inpcb *inp;
636 struct icmp6_filter *filter;
637 int error;
638
639 inp = sotoinpcb(so);
640 KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
641
642 error = priv_check(td, PRIV_NETINET_RAW);
643 if (error)
644 return (error);
645 error = soreserve(so, rip_sendspace, rip_recvspace);
646 if (error)
647 return (error);
648 filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
649 if (filter == NULL)
650 return (ENOMEM);
651 INP_INFO_WLOCK(&V_ripcbinfo);
652 error = in_pcballoc(so, &V_ripcbinfo);
653 if (error) {
654 INP_INFO_WUNLOCK(&V_ripcbinfo);
655 free(filter, M_PCB);
656 return (error);
657 }
658 inp = (struct inpcb *)so->so_pcb;
659 INP_INFO_WUNLOCK(&V_ripcbinfo);
660 inp->inp_vflag |= INP_IPV6;
661 inp->inp_ip_p = (long)proto;
662 inp->in6p_hops = -1; /* use kernel default */
663 inp->in6p_cksum = -1;
664 inp->in6p_icmp6filt = filter;
665 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
666 INP_WUNLOCK(inp);
667 return (0);
668 }
669
670 static void
671 rip6_detach(struct socket *so)
672 {
673 struct inpcb *inp;
674
675 inp = sotoinpcb(so);
676 KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
677
678 if (so == V_ip6_mrouter && ip6_mrouter_done)
679 ip6_mrouter_done();
680 /* xxx: RSVP */
681 INP_INFO_WLOCK(&V_ripcbinfo);
682 INP_WLOCK(inp);
683 free(inp->in6p_icmp6filt, M_PCB);
684 in_pcbdetach(inp);
685 in_pcbfree(inp);
686 INP_INFO_WUNLOCK(&V_ripcbinfo);
687 }
688
689 /* XXXRW: This can't ever be called. */
690 static void
691 rip6_abort(struct socket *so)
692 {
693 struct inpcb *inp;
694
695 inp = sotoinpcb(so);
696 KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
697
698 soisdisconnected(so);
699 }
700
701 static void
702 rip6_close(struct socket *so)
703 {
704 struct inpcb *inp;
705
706 inp = sotoinpcb(so);
707 KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
708
709 soisdisconnected(so);
710 }
711
712 static int
713 rip6_disconnect(struct socket *so)
714 {
715 struct inpcb *inp;
716
717 inp = sotoinpcb(so);
718 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
719
720 if ((so->so_state & SS_ISCONNECTED) == 0)
721 return (ENOTCONN);
722 inp->in6p_faddr = in6addr_any;
723 rip6_abort(so);
724 return (0);
725 }
726
727 static int
728 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
729 {
730 struct inpcb *inp;
731 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
732 struct ifaddr *ifa = NULL;
733 int error = 0;
734
735 inp = sotoinpcb(so);
736 KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
737
738 if (nam->sa_len != sizeof(*addr))
739 return (EINVAL);
740 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
741 return (error);
742 if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
743 return (EADDRNOTAVAIL);
744 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
745 return (error);
746
747 NET_EPOCH_ENTER();
748 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
749 (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
750 NET_EPOCH_EXIT();
751 return (EADDRNOTAVAIL);
752 }
753 if (ifa != NULL &&
754 ((struct in6_ifaddr *)ifa)->ia6_flags &
755 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
756 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
757 NET_EPOCH_EXIT();
758 return (EADDRNOTAVAIL);
759 }
760 NET_EPOCH_EXIT();
761 INP_INFO_WLOCK(&V_ripcbinfo);
762 INP_WLOCK(inp);
763 inp->in6p_laddr = addr->sin6_addr;
764 INP_WUNLOCK(inp);
765 INP_INFO_WUNLOCK(&V_ripcbinfo);
766 return (0);
767 }
768
769 static int
770 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
771 {
772 struct inpcb *inp;
773 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
774 struct in6_addr in6a;
775 int error = 0, scope_ambiguous = 0;
776
777 inp = sotoinpcb(so);
778 KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
779
780 if (nam->sa_len != sizeof(*addr))
781 return (EINVAL);
782 if (CK_STAILQ_EMPTY(&V_ifnet))
783 return (EADDRNOTAVAIL);
784 if (addr->sin6_family != AF_INET6)
785 return (EAFNOSUPPORT);
786
787 /*
788 * Application should provide a proper zone ID or the use of default
789 * zone IDs should be enabled. Unfortunately, some applications do
790 * not behave as it should, so we need a workaround. Even if an
791 * appropriate ID is not determined, we'll see if we can determine
792 * the outgoing interface. If we can, determine the zone ID based on
793 * the interface below.
794 */
795 if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
796 scope_ambiguous = 1;
797 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
798 return (error);
799
800 INP_INFO_WLOCK(&V_ripcbinfo);
801 INP_WLOCK(inp);
802 /* Source address selection. XXX: need pcblookup? */
803 error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
804 inp, so->so_cred, scope_ambiguous, &in6a, NULL);
805 if (error) {
806 INP_WUNLOCK(inp);
807 INP_INFO_WUNLOCK(&V_ripcbinfo);
808 return (error);
809 }
810
811 inp->in6p_faddr = addr->sin6_addr;
812 inp->in6p_laddr = in6a;
813 soisconnected(so);
814 INP_WUNLOCK(inp);
815 INP_INFO_WUNLOCK(&V_ripcbinfo);
816 return (0);
817 }
818
819 static int
820 rip6_shutdown(struct socket *so)
821 {
822 struct inpcb *inp;
823
824 inp = sotoinpcb(so);
825 KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
826
827 INP_WLOCK(inp);
828 socantsendmore(so);
829 INP_WUNLOCK(inp);
830 return (0);
831 }
832
833 static int
834 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
835 struct mbuf *control, struct thread *td)
836 {
837 struct inpcb *inp;
838 struct sockaddr_in6 tmp;
839 struct sockaddr_in6 *dst;
840 int ret;
841
842 inp = sotoinpcb(so);
843 KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
844
845 /* Always copy sockaddr to avoid overwrites. */
846 /* Unlocked read. */
847 if (so->so_state & SS_ISCONNECTED) {
848 if (nam) {
849 m_freem(m);
850 return (EISCONN);
851 }
852 /* XXX */
853 bzero(&tmp, sizeof(tmp));
854 tmp.sin6_family = AF_INET6;
855 tmp.sin6_len = sizeof(struct sockaddr_in6);
856 INP_RLOCK(inp);
857 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
858 sizeof(struct in6_addr));
859 INP_RUNLOCK(inp);
860 dst = &tmp;
861 } else {
862 if (nam == NULL) {
863 m_freem(m);
864 return (ENOTCONN);
865 }
866 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
867 m_freem(m);
868 return (EINVAL);
869 }
870 tmp = *(struct sockaddr_in6 *)nam;
871 dst = &tmp;
872
873 if (dst->sin6_family == AF_UNSPEC) {
874 /*
875 * XXX: we allow this case for backward
876 * compatibility to buggy applications that
877 * rely on old (and wrong) kernel behavior.
878 */
879 log(LOG_INFO, "rip6 SEND: address family is "
880 "unspec. Assume AF_INET6\n");
881 dst->sin6_family = AF_INET6;
882 } else if (dst->sin6_family != AF_INET6) {
883 m_freem(m);
884 return(EAFNOSUPPORT);
885 }
886 }
887 ret = rip6_output(m, so, dst, control);
888 return (ret);
889 }
890
891 struct pr_usrreqs rip6_usrreqs = {
892 .pru_abort = rip6_abort,
893 .pru_attach = rip6_attach,
894 .pru_bind = rip6_bind,
895 .pru_connect = rip6_connect,
896 .pru_control = in6_control,
897 .pru_detach = rip6_detach,
898 .pru_disconnect = rip6_disconnect,
899 .pru_peeraddr = in6_getpeeraddr,
900 .pru_send = rip6_send,
901 .pru_shutdown = rip6_shutdown,
902 .pru_sockaddr = in6_getsockaddr,
903 .pru_close = rip6_close,
904 };
Cache object: 592eceb0b29b6640ec891b0c51fcb7c1
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