1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * Copyright (c) 2010-2011 Juniper Networks, Inc.
4 * All rights reserved.
5 *
6 * Portions of this software were developed by Robert N. M. Watson under
7 * contract to Juniper Networks, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $
34 */
35
36 /*-
37 * Copyright (c) 1982, 1986, 1991, 1993
38 * The Regents of the University of California. All rights reserved.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 4. Neither the name of the University nor the names of its contributors
49 * may be used to endorse or promote products derived from this software
50 * without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 * SUCH DAMAGE.
63 *
64 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
65 */
66
67 #include <sys/cdefs.h>
68 __FBSDID("$FreeBSD: releng/10.3/sys/netinet6/in6_pcb.c 279911 2015-03-12 09:04:19Z ae $");
69
70 #include "opt_inet.h"
71 #include "opt_inet6.h"
72 #include "opt_ipsec.h"
73 #include "opt_pcbgroup.h"
74
75 #include <sys/param.h>
76 #include <sys/systm.h>
77 #include <sys/malloc.h>
78 #include <sys/mbuf.h>
79 #include <sys/domain.h>
80 #include <sys/protosw.h>
81 #include <sys/socket.h>
82 #include <sys/socketvar.h>
83 #include <sys/sockio.h>
84 #include <sys/errno.h>
85 #include <sys/time.h>
86 #include <sys/priv.h>
87 #include <sys/proc.h>
88 #include <sys/jail.h>
89
90 #include <vm/uma.h>
91
92 #include <net/if.h>
93 #include <net/if_types.h>
94 #include <net/route.h>
95
96 #include <netinet/in.h>
97 #include <netinet/in_var.h>
98 #include <netinet/in_systm.h>
99 #include <netinet/tcp_var.h>
100 #include <netinet/ip6.h>
101 #include <netinet/ip_var.h>
102
103 #include <netinet6/ip6_var.h>
104 #include <netinet6/nd6.h>
105 #include <netinet/in_pcb.h>
106 #include <netinet6/in6_pcb.h>
107 #include <netinet6/scope6_var.h>
108
109 int
110 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam,
111 struct ucred *cred)
112 {
113 struct socket *so = inp->inp_socket;
114 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
115 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
116 u_short lport = 0;
117 int error, lookupflags = 0;
118 int reuseport = (so->so_options & SO_REUSEPORT);
119
120 INP_WLOCK_ASSERT(inp);
121 INP_HASH_WLOCK_ASSERT(pcbinfo);
122
123 if (TAILQ_EMPTY(&V_in6_ifaddrhead)) /* XXX broken! */
124 return (EADDRNOTAVAIL);
125 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
126 return (EINVAL);
127 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
128 lookupflags = INPLOOKUP_WILDCARD;
129 if (nam == NULL) {
130 if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
131 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
132 return (error);
133 } else {
134 sin6 = (struct sockaddr_in6 *)nam;
135 if (nam->sa_len != sizeof(*sin6))
136 return (EINVAL);
137 /*
138 * family check.
139 */
140 if (nam->sa_family != AF_INET6)
141 return (EAFNOSUPPORT);
142
143 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
144 return(error);
145
146 if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
147 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
148 return (error);
149
150 lport = sin6->sin6_port;
151 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
152 /*
153 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
154 * allow compepte duplication of binding if
155 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
156 * and a multicast address is bound on both
157 * new and duplicated sockets.
158 */
159 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
160 reuseport = SO_REUSEADDR|SO_REUSEPORT;
161 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
162 struct ifaddr *ifa;
163
164 sin6->sin6_port = 0; /* yech... */
165 if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
166 NULL &&
167 (inp->inp_flags & INP_BINDANY) == 0) {
168 return (EADDRNOTAVAIL);
169 }
170
171 /*
172 * XXX: bind to an anycast address might accidentally
173 * cause sending a packet with anycast source address.
174 * We should allow to bind to a deprecated address, since
175 * the application dares to use it.
176 */
177 if (ifa != NULL &&
178 ((struct in6_ifaddr *)ifa)->ia6_flags &
179 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
180 ifa_free(ifa);
181 return (EADDRNOTAVAIL);
182 }
183 if (ifa != NULL)
184 ifa_free(ifa);
185 }
186 if (lport) {
187 struct inpcb *t;
188 struct tcptw *tw;
189
190 /* GROSS */
191 if (ntohs(lport) <= V_ipport_reservedhigh &&
192 ntohs(lport) >= V_ipport_reservedlow &&
193 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
194 0))
195 return (EACCES);
196 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
197 priv_check_cred(inp->inp_cred,
198 PRIV_NETINET_REUSEPORT, 0) != 0) {
199 t = in6_pcblookup_local(pcbinfo,
200 &sin6->sin6_addr, lport,
201 INPLOOKUP_WILDCARD, cred);
202 if (t &&
203 ((t->inp_flags & INP_TIMEWAIT) == 0) &&
204 (so->so_type != SOCK_STREAM ||
205 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
206 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
207 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
208 (t->inp_flags2 & INP_REUSEPORT) == 0) &&
209 (inp->inp_cred->cr_uid !=
210 t->inp_cred->cr_uid))
211 return (EADDRINUSE);
212 #ifdef INET
213 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
214 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
215 struct sockaddr_in sin;
216
217 in6_sin6_2_sin(&sin, sin6);
218 t = in_pcblookup_local(pcbinfo,
219 sin.sin_addr, lport,
220 INPLOOKUP_WILDCARD, cred);
221 if (t &&
222 ((t->inp_flags &
223 INP_TIMEWAIT) == 0) &&
224 (so->so_type != SOCK_STREAM ||
225 ntohl(t->inp_faddr.s_addr) ==
226 INADDR_ANY) &&
227 (inp->inp_cred->cr_uid !=
228 t->inp_cred->cr_uid))
229 return (EADDRINUSE);
230 }
231 #endif
232 }
233 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
234 lport, lookupflags, cred);
235 if (t && (t->inp_flags & INP_TIMEWAIT)) {
236 /*
237 * XXXRW: If an incpb has had its timewait
238 * state recycled, we treat the address as
239 * being in use (for now). This is better
240 * than a panic, but not desirable.
241 */
242 tw = intotw(t);
243 if (tw == NULL ||
244 (reuseport & tw->tw_so_options) == 0)
245 return (EADDRINUSE);
246 } else if (t && (reuseport & inp_so_options(t)) == 0) {
247 return (EADDRINUSE);
248 }
249 #ifdef INET
250 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
251 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
252 struct sockaddr_in sin;
253
254 in6_sin6_2_sin(&sin, sin6);
255 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
256 lport, lookupflags, cred);
257 if (t && t->inp_flags & INP_TIMEWAIT) {
258 tw = intotw(t);
259 if (tw == NULL)
260 return (EADDRINUSE);
261 if ((reuseport & tw->tw_so_options) == 0
262 && (ntohl(t->inp_laddr.s_addr) !=
263 INADDR_ANY || ((inp->inp_vflag &
264 INP_IPV6PROTO) ==
265 (t->inp_vflag & INP_IPV6PROTO))))
266 return (EADDRINUSE);
267 } else if (t &&
268 (reuseport & inp_so_options(t)) == 0 &&
269 (ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
270 (t->inp_vflag & INP_IPV6PROTO) != 0))
271 return (EADDRINUSE);
272 }
273 #endif
274 }
275 inp->in6p_laddr = sin6->sin6_addr;
276 }
277 if (lport == 0) {
278 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
279 /* Undo an address bind that may have occurred. */
280 inp->in6p_laddr = in6addr_any;
281 return (error);
282 }
283 } else {
284 inp->inp_lport = lport;
285 if (in_pcbinshash(inp) != 0) {
286 inp->in6p_laddr = in6addr_any;
287 inp->inp_lport = 0;
288 return (EAGAIN);
289 }
290 }
291 return (0);
292 }
293
294 /*
295 * Transform old in6_pcbconnect() into an inner subroutine for new
296 * in6_pcbconnect(): Do some validity-checking on the remote
297 * address (in mbuf 'nam') and then determine local host address
298 * (i.e., which interface) to use to access that remote host.
299 *
300 * This preserves definition of in6_pcbconnect(), while supporting a
301 * slightly different version for T/TCP. (This is more than
302 * a bit of a kludge, but cleaning up the internal interfaces would
303 * have forced minor changes in every protocol).
304 */
305 int
306 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam,
307 struct in6_addr *plocal_addr6)
308 {
309 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
310 int error = 0;
311 struct ifnet *ifp = NULL;
312 int scope_ambiguous = 0;
313 struct in6_addr in6a;
314
315 INP_WLOCK_ASSERT(inp);
316 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); /* XXXRW: why? */
317
318 if (nam->sa_len != sizeof (*sin6))
319 return (EINVAL);
320 if (sin6->sin6_family != AF_INET6)
321 return (EAFNOSUPPORT);
322 if (sin6->sin6_port == 0)
323 return (EADDRNOTAVAIL);
324
325 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
326 scope_ambiguous = 1;
327 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
328 return(error);
329
330 if (!TAILQ_EMPTY(&V_in6_ifaddrhead)) {
331 /*
332 * If the destination address is UNSPECIFIED addr,
333 * use the loopback addr, e.g ::1.
334 */
335 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
336 sin6->sin6_addr = in6addr_loopback;
337 }
338 if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
339 return (error);
340
341 error = in6_selectsrc(sin6, inp->in6p_outputopts,
342 inp, NULL, inp->inp_cred, &ifp, &in6a);
343 if (error)
344 return (error);
345
346 if (ifp && scope_ambiguous &&
347 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
348 return(error);
349 }
350
351 /*
352 * Do not update this earlier, in case we return with an error.
353 *
354 * XXX: this in6_selectsrc result might replace the bound local
355 * address with the address specified by setsockopt(IPV6_PKTINFO).
356 * Is it the intended behavior?
357 */
358 *plocal_addr6 = in6a;
359
360 /*
361 * Don't do pcblookup call here; return interface in
362 * plocal_addr6
363 * and exit to caller, that will do the lookup.
364 */
365
366 return (0);
367 }
368
369 /*
370 * Outer subroutine:
371 * Connect from a socket to a specified address.
372 * Both address and port must be specified in argument sin.
373 * If don't have a local address for this socket yet,
374 * then pick one.
375 */
376 int
377 in6_pcbconnect_mbuf(register struct inpcb *inp, struct sockaddr *nam,
378 struct ucred *cred, struct mbuf *m)
379 {
380 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
381 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
382 struct in6_addr addr6;
383 int error;
384
385 INP_WLOCK_ASSERT(inp);
386 INP_HASH_WLOCK_ASSERT(pcbinfo);
387
388 /*
389 * Call inner routine, to assign local interface address.
390 * in6_pcbladdr() may automatically fill in sin6_scope_id.
391 */
392 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
393 return (error);
394
395 if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
396 sin6->sin6_port,
397 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
398 ? &addr6 : &inp->in6p_laddr,
399 inp->inp_lport, 0, NULL) != NULL) {
400 return (EADDRINUSE);
401 }
402 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
403 if (inp->inp_lport == 0) {
404 error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
405 if (error)
406 return (error);
407 }
408 inp->in6p_laddr = addr6;
409 }
410 inp->in6p_faddr = sin6->sin6_addr;
411 inp->inp_fport = sin6->sin6_port;
412 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
413 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
414 if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
415 inp->inp_flow |=
416 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
417
418 in_pcbrehash_mbuf(inp, m);
419
420 return (0);
421 }
422
423 int
424 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
425 {
426
427 return (in6_pcbconnect_mbuf(inp, nam, cred, NULL));
428 }
429
430 void
431 in6_pcbdisconnect(struct inpcb *inp)
432 {
433
434 INP_WLOCK_ASSERT(inp);
435 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
436
437 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
438 inp->inp_fport = 0;
439 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
440 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
441 in_pcbrehash(inp);
442 }
443
444 struct sockaddr *
445 in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
446 {
447 struct sockaddr_in6 *sin6;
448
449 sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
450 bzero(sin6, sizeof *sin6);
451 sin6->sin6_family = AF_INET6;
452 sin6->sin6_len = sizeof(*sin6);
453 sin6->sin6_port = port;
454 sin6->sin6_addr = *addr_p;
455 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
456
457 return (struct sockaddr *)sin6;
458 }
459
460 struct sockaddr *
461 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
462 {
463 struct sockaddr_in sin;
464 struct sockaddr_in6 *sin6_p;
465
466 bzero(&sin, sizeof sin);
467 sin.sin_family = AF_INET;
468 sin.sin_len = sizeof(sin);
469 sin.sin_port = port;
470 sin.sin_addr = *addr_p;
471
472 sin6_p = malloc(sizeof *sin6_p, M_SONAME,
473 M_WAITOK);
474 in6_sin_2_v4mapsin6(&sin, sin6_p);
475
476 return (struct sockaddr *)sin6_p;
477 }
478
479 int
480 in6_getsockaddr(struct socket *so, struct sockaddr **nam)
481 {
482 register struct inpcb *inp;
483 struct in6_addr addr;
484 in_port_t port;
485
486 inp = sotoinpcb(so);
487 KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
488
489 INP_RLOCK(inp);
490 port = inp->inp_lport;
491 addr = inp->in6p_laddr;
492 INP_RUNLOCK(inp);
493
494 *nam = in6_sockaddr(port, &addr);
495 return 0;
496 }
497
498 int
499 in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
500 {
501 struct inpcb *inp;
502 struct in6_addr addr;
503 in_port_t port;
504
505 inp = sotoinpcb(so);
506 KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
507
508 INP_RLOCK(inp);
509 port = inp->inp_fport;
510 addr = inp->in6p_faddr;
511 INP_RUNLOCK(inp);
512
513 *nam = in6_sockaddr(port, &addr);
514 return 0;
515 }
516
517 int
518 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
519 {
520 struct inpcb *inp;
521 int error;
522
523 inp = sotoinpcb(so);
524 KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
525
526 #ifdef INET
527 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
528 error = in_getsockaddr(so, nam);
529 if (error == 0)
530 in6_sin_2_v4mapsin6_in_sock(nam);
531 } else
532 #endif
533 {
534 /* scope issues will be handled in in6_getsockaddr(). */
535 error = in6_getsockaddr(so, nam);
536 }
537
538 return error;
539 }
540
541 int
542 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
543 {
544 struct inpcb *inp;
545 int error;
546
547 inp = sotoinpcb(so);
548 KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
549
550 #ifdef INET
551 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
552 error = in_getpeeraddr(so, nam);
553 if (error == 0)
554 in6_sin_2_v4mapsin6_in_sock(nam);
555 } else
556 #endif
557 /* scope issues will be handled in in6_getpeeraddr(). */
558 error = in6_getpeeraddr(so, nam);
559
560 return error;
561 }
562
563 /*
564 * Pass some notification to all connections of a protocol
565 * associated with address dst. The local address and/or port numbers
566 * may be specified to limit the search. The "usual action" will be
567 * taken, depending on the ctlinput cmd. The caller must filter any
568 * cmds that are uninteresting (e.g., no error in the map).
569 * Call the protocol specific routine (if any) to report
570 * any errors for each matching socket.
571 */
572 void
573 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
574 u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
575 int cmd, void *cmdarg,
576 struct inpcb *(*notify)(struct inpcb *, int))
577 {
578 struct inpcb *inp, *inp_temp;
579 struct sockaddr_in6 sa6_src, *sa6_dst;
580 u_short fport = fport_arg, lport = lport_arg;
581 u_int32_t flowinfo;
582 int errno;
583
584 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
585 return;
586
587 sa6_dst = (struct sockaddr_in6 *)dst;
588 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
589 return;
590
591 /*
592 * note that src can be NULL when we get notify by local fragmentation.
593 */
594 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
595 flowinfo = sa6_src.sin6_flowinfo;
596
597 /*
598 * Redirects go to all references to the destination,
599 * and use in6_rtchange to invalidate the route cache.
600 * Dead host indications: also use in6_rtchange to invalidate
601 * the cache, and deliver the error to all the sockets.
602 * Otherwise, if we have knowledge of the local port and address,
603 * deliver only to that socket.
604 */
605 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
606 fport = 0;
607 lport = 0;
608 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
609
610 if (cmd != PRC_HOSTDEAD)
611 notify = in6_rtchange;
612 }
613 errno = inet6ctlerrmap[cmd];
614 INP_INFO_WLOCK(pcbinfo);
615 LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
616 INP_WLOCK(inp);
617 if ((inp->inp_vflag & INP_IPV6) == 0) {
618 INP_WUNLOCK(inp);
619 continue;
620 }
621
622 /*
623 * If the error designates a new path MTU for a destination
624 * and the application (associated with this socket) wanted to
625 * know the value, notify.
626 * XXX: should we avoid to notify the value to TCP sockets?
627 */
628 if (cmd == PRC_MSGSIZE && cmdarg != NULL)
629 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
630 *(u_int32_t *)cmdarg);
631
632 /*
633 * Detect if we should notify the error. If no source and
634 * destination ports are specifed, but non-zero flowinfo and
635 * local address match, notify the error. This is the case
636 * when the error is delivered with an encrypted buffer
637 * by ESP. Otherwise, just compare addresses and ports
638 * as usual.
639 */
640 if (lport == 0 && fport == 0 && flowinfo &&
641 inp->inp_socket != NULL &&
642 flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
643 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
644 goto do_notify;
645 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
646 &sa6_dst->sin6_addr) ||
647 inp->inp_socket == 0 ||
648 (lport && inp->inp_lport != lport) ||
649 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
650 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
651 &sa6_src.sin6_addr)) ||
652 (fport && inp->inp_fport != fport)) {
653 INP_WUNLOCK(inp);
654 continue;
655 }
656
657 do_notify:
658 if (notify) {
659 if ((*notify)(inp, errno))
660 INP_WUNLOCK(inp);
661 } else
662 INP_WUNLOCK(inp);
663 }
664 INP_INFO_WUNLOCK(pcbinfo);
665 }
666
667 /*
668 * Lookup a PCB based on the local address and port. Caller must hold the
669 * hash lock. No inpcb locks or references are acquired.
670 */
671 struct inpcb *
672 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
673 u_short lport, int lookupflags, struct ucred *cred)
674 {
675 register struct inpcb *inp;
676 int matchwild = 3, wildcard;
677
678 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
679 ("%s: invalid lookup flags %d", __func__, lookupflags));
680
681 INP_HASH_WLOCK_ASSERT(pcbinfo);
682
683 if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
684 struct inpcbhead *head;
685 /*
686 * Look for an unconnected (wildcard foreign addr) PCB that
687 * matches the local address and port we're looking for.
688 */
689 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
690 0, pcbinfo->ipi_hashmask)];
691 LIST_FOREACH(inp, head, inp_hash) {
692 /* XXX inp locking */
693 if ((inp->inp_vflag & INP_IPV6) == 0)
694 continue;
695 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
696 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
697 inp->inp_lport == lport) {
698 /* Found. */
699 if (cred == NULL ||
700 prison_equal_ip6(cred->cr_prison,
701 inp->inp_cred->cr_prison))
702 return (inp);
703 }
704 }
705 /*
706 * Not found.
707 */
708 return (NULL);
709 } else {
710 struct inpcbporthead *porthash;
711 struct inpcbport *phd;
712 struct inpcb *match = NULL;
713 /*
714 * Best fit PCB lookup.
715 *
716 * First see if this local port is in use by looking on the
717 * port hash list.
718 */
719 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
720 pcbinfo->ipi_porthashmask)];
721 LIST_FOREACH(phd, porthash, phd_hash) {
722 if (phd->phd_port == lport)
723 break;
724 }
725 if (phd != NULL) {
726 /*
727 * Port is in use by one or more PCBs. Look for best
728 * fit.
729 */
730 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
731 wildcard = 0;
732 if (cred != NULL &&
733 !prison_equal_ip6(cred->cr_prison,
734 inp->inp_cred->cr_prison))
735 continue;
736 /* XXX inp locking */
737 if ((inp->inp_vflag & INP_IPV6) == 0)
738 continue;
739 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
740 wildcard++;
741 if (!IN6_IS_ADDR_UNSPECIFIED(
742 &inp->in6p_laddr)) {
743 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
744 wildcard++;
745 else if (!IN6_ARE_ADDR_EQUAL(
746 &inp->in6p_laddr, laddr))
747 continue;
748 } else {
749 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
750 wildcard++;
751 }
752 if (wildcard < matchwild) {
753 match = inp;
754 matchwild = wildcard;
755 if (matchwild == 0)
756 break;
757 }
758 }
759 }
760 return (match);
761 }
762 }
763
764 void
765 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
766 {
767 struct inpcb *in6p;
768 struct ip6_moptions *im6o;
769 int i, gap;
770
771 INP_INFO_RLOCK(pcbinfo);
772 LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
773 INP_WLOCK(in6p);
774 im6o = in6p->in6p_moptions;
775 if ((in6p->inp_vflag & INP_IPV6) && im6o != NULL) {
776 /*
777 * Unselect the outgoing ifp for multicast if it
778 * is being detached.
779 */
780 if (im6o->im6o_multicast_ifp == ifp)
781 im6o->im6o_multicast_ifp = NULL;
782 /*
783 * Drop multicast group membership if we joined
784 * through the interface being detached.
785 */
786 gap = 0;
787 for (i = 0; i < im6o->im6o_num_memberships; i++) {
788 if (im6o->im6o_membership[i]->in6m_ifp ==
789 ifp) {
790 in6_mc_leave(im6o->im6o_membership[i],
791 NULL);
792 gap++;
793 } else if (gap != 0) {
794 im6o->im6o_membership[i - gap] =
795 im6o->im6o_membership[i];
796 }
797 }
798 im6o->im6o_num_memberships -= gap;
799 }
800 INP_WUNLOCK(in6p);
801 }
802 INP_INFO_RUNLOCK(pcbinfo);
803 }
804
805 /*
806 * Check for alternatives when higher level complains
807 * about service problems. For now, invalidate cached
808 * routing information. If the route was created dynamically
809 * (by a redirect), time to try a default gateway again.
810 */
811 void
812 in6_losing(struct inpcb *in6p)
813 {
814
815 /*
816 * We don't store route pointers in the routing table anymore
817 */
818 return;
819 }
820
821 /*
822 * After a routing change, flush old routing
823 * and allocate a (hopefully) better one.
824 */
825 struct inpcb *
826 in6_rtchange(struct inpcb *inp, int errno)
827 {
828 /*
829 * We don't store route pointers in the routing table anymore
830 */
831 return inp;
832 }
833
834 #ifdef PCBGROUP
835 /*
836 * Lookup PCB in hash list, using pcbgroup tables.
837 */
838 static struct inpcb *
839 in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
840 struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr,
841 u_int lport_arg, int lookupflags, struct ifnet *ifp)
842 {
843 struct inpcbhead *head;
844 struct inpcb *inp, *tmpinp;
845 u_short fport = fport_arg, lport = lport_arg;
846 int faith;
847
848 if (faithprefix_p != NULL)
849 faith = (*faithprefix_p)(laddr);
850 else
851 faith = 0;
852
853 /*
854 * First look for an exact match.
855 */
856 tmpinp = NULL;
857 INP_GROUP_LOCK(pcbgroup);
858 head = &pcbgroup->ipg_hashbase[
859 INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport,
860 pcbgroup->ipg_hashmask)];
861 LIST_FOREACH(inp, head, inp_pcbgrouphash) {
862 /* XXX inp locking */
863 if ((inp->inp_vflag & INP_IPV6) == 0)
864 continue;
865 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
866 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
867 inp->inp_fport == fport &&
868 inp->inp_lport == lport) {
869 /*
870 * XXX We should be able to directly return
871 * the inp here, without any checks.
872 * Well unless both bound with SO_REUSEPORT?
873 */
874 if (prison_flag(inp->inp_cred, PR_IP6))
875 goto found;
876 if (tmpinp == NULL)
877 tmpinp = inp;
878 }
879 }
880 if (tmpinp != NULL) {
881 inp = tmpinp;
882 goto found;
883 }
884
885 /*
886 * Then look for a wildcard match, if requested.
887 */
888 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
889 struct inpcb *local_wild = NULL, *local_exact = NULL;
890 struct inpcb *jail_wild = NULL;
891 int injail;
892
893 /*
894 * Order of socket selection - we always prefer jails.
895 * 1. jailed, non-wild.
896 * 2. jailed, wild.
897 * 3. non-jailed, non-wild.
898 * 4. non-jailed, wild.
899 */
900 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
901 0, pcbinfo->ipi_wildmask)];
902 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
903 /* XXX inp locking */
904 if ((inp->inp_vflag & INP_IPV6) == 0)
905 continue;
906
907 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
908 inp->inp_lport != lport) {
909 continue;
910 }
911
912 /* XXX inp locking */
913 if (faith && (inp->inp_flags & INP_FAITH) == 0)
914 continue;
915
916 injail = prison_flag(inp->inp_cred, PR_IP6);
917 if (injail) {
918 if (prison_check_ip6(inp->inp_cred,
919 laddr) != 0)
920 continue;
921 } else {
922 if (local_exact != NULL)
923 continue;
924 }
925
926 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
927 if (injail)
928 goto found;
929 else
930 local_exact = inp;
931 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
932 if (injail)
933 jail_wild = inp;
934 else
935 local_wild = inp;
936 }
937 } /* LIST_FOREACH */
938
939 inp = jail_wild;
940 if (inp == NULL)
941 inp = jail_wild;
942 if (inp == NULL)
943 inp = local_exact;
944 if (inp == NULL)
945 inp = local_wild;
946 if (inp != NULL)
947 goto found;
948 } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
949 INP_GROUP_UNLOCK(pcbgroup);
950 return (NULL);
951
952 found:
953 in_pcbref(inp);
954 INP_GROUP_UNLOCK(pcbgroup);
955 if (lookupflags & INPLOOKUP_WLOCKPCB) {
956 INP_WLOCK(inp);
957 if (in_pcbrele_wlocked(inp))
958 return (NULL);
959 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
960 INP_RLOCK(inp);
961 if (in_pcbrele_rlocked(inp))
962 return (NULL);
963 } else
964 panic("%s: locking buf", __func__);
965 return (inp);
966 }
967 #endif /* PCBGROUP */
968
969 /*
970 * Lookup PCB in hash list.
971 */
972 struct inpcb *
973 in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
974 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
975 int lookupflags, struct ifnet *ifp)
976 {
977 struct inpcbhead *head;
978 struct inpcb *inp, *tmpinp;
979 u_short fport = fport_arg, lport = lport_arg;
980 int faith;
981
982 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
983 ("%s: invalid lookup flags %d", __func__, lookupflags));
984
985 INP_HASH_LOCK_ASSERT(pcbinfo);
986
987 if (faithprefix_p != NULL)
988 faith = (*faithprefix_p)(laddr);
989 else
990 faith = 0;
991
992 /*
993 * First look for an exact match.
994 */
995 tmpinp = NULL;
996 head = &pcbinfo->ipi_hashbase[
997 INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport,
998 pcbinfo->ipi_hashmask)];
999 LIST_FOREACH(inp, head, inp_hash) {
1000 /* XXX inp locking */
1001 if ((inp->inp_vflag & INP_IPV6) == 0)
1002 continue;
1003 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1004 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1005 inp->inp_fport == fport &&
1006 inp->inp_lport == lport) {
1007 /*
1008 * XXX We should be able to directly return
1009 * the inp here, without any checks.
1010 * Well unless both bound with SO_REUSEPORT?
1011 */
1012 if (prison_flag(inp->inp_cred, PR_IP6))
1013 return (inp);
1014 if (tmpinp == NULL)
1015 tmpinp = inp;
1016 }
1017 }
1018 if (tmpinp != NULL)
1019 return (tmpinp);
1020
1021 /*
1022 * Then look for a wildcard match, if requested.
1023 */
1024 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1025 struct inpcb *local_wild = NULL, *local_exact = NULL;
1026 struct inpcb *jail_wild = NULL;
1027 int injail;
1028
1029 /*
1030 * Order of socket selection - we always prefer jails.
1031 * 1. jailed, non-wild.
1032 * 2. jailed, wild.
1033 * 3. non-jailed, non-wild.
1034 * 4. non-jailed, wild.
1035 */
1036 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1037 0, pcbinfo->ipi_hashmask)];
1038 LIST_FOREACH(inp, head, inp_hash) {
1039 /* XXX inp locking */
1040 if ((inp->inp_vflag & INP_IPV6) == 0)
1041 continue;
1042
1043 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1044 inp->inp_lport != lport) {
1045 continue;
1046 }
1047
1048 /* XXX inp locking */
1049 if (faith && (inp->inp_flags & INP_FAITH) == 0)
1050 continue;
1051
1052 injail = prison_flag(inp->inp_cred, PR_IP6);
1053 if (injail) {
1054 if (prison_check_ip6(inp->inp_cred,
1055 laddr) != 0)
1056 continue;
1057 } else {
1058 if (local_exact != NULL)
1059 continue;
1060 }
1061
1062 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1063 if (injail)
1064 return (inp);
1065 else
1066 local_exact = inp;
1067 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1068 if (injail)
1069 jail_wild = inp;
1070 else
1071 local_wild = inp;
1072 }
1073 } /* LIST_FOREACH */
1074
1075 if (jail_wild != NULL)
1076 return (jail_wild);
1077 if (local_exact != NULL)
1078 return (local_exact);
1079 if (local_wild != NULL)
1080 return (local_wild);
1081 } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1082
1083 /*
1084 * Not found.
1085 */
1086 return (NULL);
1087 }
1088
1089 /*
1090 * Lookup PCB in hash list, using pcbinfo tables. This variation locks the
1091 * hash list lock, and will return the inpcb locked (i.e., requires
1092 * INPLOOKUP_LOCKPCB).
1093 */
1094 static struct inpcb *
1095 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1096 u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1097 struct ifnet *ifp)
1098 {
1099 struct inpcb *inp;
1100
1101 INP_HASH_RLOCK(pcbinfo);
1102 inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1103 (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1104 if (inp != NULL) {
1105 in_pcbref(inp);
1106 INP_HASH_RUNLOCK(pcbinfo);
1107 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1108 INP_WLOCK(inp);
1109 if (in_pcbrele_wlocked(inp))
1110 return (NULL);
1111 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1112 INP_RLOCK(inp);
1113 if (in_pcbrele_rlocked(inp))
1114 return (NULL);
1115 } else
1116 panic("%s: locking bug", __func__);
1117 } else
1118 INP_HASH_RUNLOCK(pcbinfo);
1119 return (inp);
1120 }
1121
1122 /*
1123 * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1124 * from which a pre-calculated hash value may be extracted.
1125 *
1126 * Possibly more of this logic should be in in6_pcbgroup.c.
1127 */
1128 struct inpcb *
1129 in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
1130 struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1131 {
1132 #if defined(PCBGROUP)
1133 struct inpcbgroup *pcbgroup;
1134 #endif
1135
1136 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1137 ("%s: invalid lookup flags %d", __func__, lookupflags));
1138 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1139 ("%s: LOCKPCB not set", __func__));
1140
1141 #if defined(PCBGROUP)
1142 if (in_pcbgroup_enabled(pcbinfo)) {
1143 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1144 fport);
1145 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1146 laddr, lport, lookupflags, ifp));
1147 }
1148 #endif
1149 return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1150 lookupflags, ifp));
1151 }
1152
1153 struct inpcb *
1154 in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1155 u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1156 struct ifnet *ifp, struct mbuf *m)
1157 {
1158 #ifdef PCBGROUP
1159 struct inpcbgroup *pcbgroup;
1160 #endif
1161
1162 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1163 ("%s: invalid lookup flags %d", __func__, lookupflags));
1164 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1165 ("%s: LOCKPCB not set", __func__));
1166
1167 #ifdef PCBGROUP
1168 if (in_pcbgroup_enabled(pcbinfo)) {
1169 pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1170 m->m_pkthdr.flowid);
1171 if (pcbgroup != NULL)
1172 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr,
1173 fport, laddr, lport, lookupflags, ifp));
1174 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1175 fport);
1176 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1177 laddr, lport, lookupflags, ifp));
1178 }
1179 #endif
1180 return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1181 lookupflags, ifp));
1182 }
1183
1184 void
1185 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1186 {
1187 struct ip6_hdr *ip;
1188
1189 ip = mtod(m, struct ip6_hdr *);
1190 bzero(sin6, sizeof(*sin6));
1191 sin6->sin6_len = sizeof(*sin6);
1192 sin6->sin6_family = AF_INET6;
1193 sin6->sin6_addr = ip->ip6_src;
1194
1195 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
1196
1197 return;
1198 }
Cache object: 5d1005abb5dfaebf357b8399e3a4df5b
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