1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $
30 */
31
32 /*-
33 * Copyright (c) 1982, 1986, 1991, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
61 */
62
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD: releng/6.4/sys/netinet6/in6_pcb.c 182649 2008-09-01 22:57:56Z obrien $");
65
66 #include "opt_inet.h"
67 #include "opt_inet6.h"
68 #include "opt_ipsec.h"
69 #include "opt_mac.h"
70
71 #include <sys/param.h>
72 #include <sys/systm.h>
73 #include <sys/mac.h>
74 #include <sys/malloc.h>
75 #include <sys/mbuf.h>
76 #include <sys/domain.h>
77 #include <sys/protosw.h>
78 #include <sys/socket.h>
79 #include <sys/socketvar.h>
80 #include <sys/sockio.h>
81 #include <sys/errno.h>
82 #include <sys/time.h>
83 #include <sys/proc.h>
84 #include <sys/jail.h>
85
86 #include <vm/uma.h>
87
88 #include <net/if.h>
89 #include <net/if_types.h>
90 #include <net/route.h>
91
92 #include <netinet/in.h>
93 #include <netinet/in_var.h>
94 #include <netinet/in_systm.h>
95 #include <netinet/tcp_var.h>
96 #include <netinet/ip6.h>
97 #include <netinet/ip_var.h>
98 #include <netinet6/ip6_var.h>
99 #include <netinet6/nd6.h>
100 #include <netinet/in_pcb.h>
101 #include <netinet6/in6_pcb.h>
102 #include <netinet6/scope6_var.h>
103
104 #ifdef IPSEC
105 #include <netinet6/ipsec.h>
106 #ifdef INET6
107 #include <netinet6/ipsec6.h>
108 #endif
109 #include <netinet6/ah.h>
110 #ifdef INET6
111 #include <netinet6/ah6.h>
112 #endif
113 #include <netkey/key.h>
114 #endif /* IPSEC */
115
116 #ifdef FAST_IPSEC
117 #include <netipsec/ipsec.h>
118 #include <netipsec/ipsec6.h>
119 #include <netipsec/key.h>
120 #endif /* FAST_IPSEC */
121
122 struct in6_addr zeroin6_addr;
123
124 int
125 in6_pcbbind(inp, nam, cred)
126 register struct inpcb *inp;
127 struct sockaddr *nam;
128 struct ucred *cred;
129 {
130 struct socket *so = inp->inp_socket;
131 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
132 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
133 u_short lport = 0;
134 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
135
136 INP_INFO_WLOCK_ASSERT(pcbinfo);
137 INP_LOCK_ASSERT(inp);
138
139 if (!in6_ifaddr) /* XXX broken! */
140 return (EADDRNOTAVAIL);
141 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
142 return (EINVAL);
143 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
144 wild = 1;
145 if (nam) {
146 int error;
147
148 sin6 = (struct sockaddr_in6 *)nam;
149 if (nam->sa_len != sizeof(*sin6))
150 return (EINVAL);
151 /*
152 * family check.
153 */
154 if (nam->sa_family != AF_INET6)
155 return (EAFNOSUPPORT);
156
157 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
158 return(error);
159
160 lport = sin6->sin6_port;
161 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
162 /*
163 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
164 * allow compepte duplication of binding if
165 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
166 * and a multicast address is bound on both
167 * new and duplicated sockets.
168 */
169 if (so->so_options & SO_REUSEADDR)
170 reuseport = SO_REUSEADDR|SO_REUSEPORT;
171 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
172 struct ifaddr *ia = NULL;
173
174 sin6->sin6_port = 0; /* yech... */
175 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
176 return (EADDRNOTAVAIL);
177
178 /*
179 * XXX: bind to an anycast address might accidentally
180 * cause sending a packet with anycast source address.
181 * We should allow to bind to a deprecated address, since
182 * the application dares to use it.
183 */
184 if (ia &&
185 ((struct in6_ifaddr *)ia)->ia6_flags &
186 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
187 return (EADDRNOTAVAIL);
188 }
189 }
190 if (lport) {
191 struct inpcb *t;
192
193 /* GROSS */
194 if (ntohs(lport) <= ipport_reservedhigh &&
195 ntohs(lport) >= ipport_reservedlow &&
196 suser_cred(cred, SUSER_ALLOWJAIL))
197 return (EACCES);
198 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
199 suser_cred(so->so_cred, SUSER_ALLOWJAIL) != 0) {
200 t = in6_pcblookup_local(pcbinfo,
201 &sin6->sin6_addr, lport,
202 INPLOOKUP_WILDCARD);
203 if (t &&
204 ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
205 (so->so_type != SOCK_STREAM ||
206 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
207 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
208 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
209 (t->inp_socket->so_options & SO_REUSEPORT)
210 == 0) && (so->so_cred->cr_uid !=
211 t->inp_socket->so_cred->cr_uid))
212 return (EADDRINUSE);
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);
221 if (t &&
222 ((t->inp_vflag &
223 INP_TIMEWAIT) == 0) &&
224 (so->so_type != SOCK_STREAM ||
225 ntohl(t->inp_faddr.s_addr) ==
226 INADDR_ANY) &&
227 (so->so_cred->cr_uid !=
228 t->inp_socket->so_cred->cr_uid))
229 return (EADDRINUSE);
230 }
231 }
232 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
233 lport, wild);
234 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ?
235 intotw(t)->tw_so_options :
236 t->inp_socket->so_options)) == 0)
237 return (EADDRINUSE);
238 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
239 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
240 struct sockaddr_in sin;
241
242 in6_sin6_2_sin(&sin, sin6);
243 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
244 lport, wild);
245 if (t && t->inp_vflag & INP_TIMEWAIT) {
246 if ((reuseport &
247 intotw(t)->tw_so_options) == 0 &&
248 (ntohl(t->inp_laddr.s_addr) !=
249 INADDR_ANY || ((inp->inp_vflag &
250 INP_IPV6PROTO) ==
251 (t->inp_vflag & INP_IPV6PROTO))))
252 return (EADDRINUSE);
253 }
254 else if (t &&
255 (reuseport & t->inp_socket->so_options)
256 == 0 && (ntohl(t->inp_laddr.s_addr) !=
257 INADDR_ANY || INP_SOCKAF(so) ==
258 INP_SOCKAF(t->inp_socket)))
259 return (EADDRINUSE);
260 }
261 }
262 inp->in6p_laddr = sin6->sin6_addr;
263 }
264 if (lport == 0) {
265 int e;
266 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0)
267 return (e);
268 }
269 else {
270 inp->inp_lport = lport;
271 if (in_pcbinshash(inp) != 0) {
272 inp->in6p_laddr = in6addr_any;
273 inp->inp_lport = 0;
274 return (EAGAIN);
275 }
276 }
277 return (0);
278 }
279
280 /*
281 * Transform old in6_pcbconnect() into an inner subroutine for new
282 * in6_pcbconnect(): Do some validity-checking on the remote
283 * address (in mbuf 'nam') and then determine local host address
284 * (i.e., which interface) to use to access that remote host.
285 *
286 * This preserves definition of in6_pcbconnect(), while supporting a
287 * slightly different version for T/TCP. (This is more than
288 * a bit of a kludge, but cleaning up the internal interfaces would
289 * have forced minor changes in every protocol).
290 */
291
292 int
293 in6_pcbladdr(inp, nam, plocal_addr6)
294 register struct inpcb *inp;
295 struct sockaddr *nam;
296 struct in6_addr **plocal_addr6;
297 {
298 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
299 int error = 0;
300 struct ifnet *ifp = NULL;
301 int scope_ambiguous = 0;
302
303 if (nam->sa_len != sizeof (*sin6))
304 return (EINVAL);
305 if (sin6->sin6_family != AF_INET6)
306 return (EAFNOSUPPORT);
307 if (sin6->sin6_port == 0)
308 return (EADDRNOTAVAIL);
309
310 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
311 scope_ambiguous = 1;
312 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
313 return(error);
314
315 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
316 INP_LOCK_ASSERT(inp);
317
318 if (in6_ifaddr) {
319 /*
320 * If the destination address is UNSPECIFIED addr,
321 * use the loopback addr, e.g ::1.
322 */
323 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
324 sin6->sin6_addr = in6addr_loopback;
325 }
326
327 /*
328 * XXX: in6_selectsrc might replace the bound local address
329 * with the address specified by setsockopt(IPV6_PKTINFO).
330 * Is it the intended behavior?
331 */
332 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
333 inp->in6p_moptions, NULL,
334 &inp->in6p_laddr, &ifp, &error);
335 if (ifp && scope_ambiguous &&
336 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
337 return(error);
338 }
339
340 if (*plocal_addr6 == 0) {
341 if (error == 0)
342 error = EADDRNOTAVAIL;
343 return (error);
344 }
345 /*
346 * Don't do pcblookup call here; return interface in
347 * plocal_addr6
348 * and exit to caller, that will do the lookup.
349 */
350
351 return (0);
352 }
353
354 /*
355 * Outer subroutine:
356 * Connect from a socket to a specified address.
357 * Both address and port must be specified in argument sin.
358 * If don't have a local address for this socket yet,
359 * then pick one.
360 */
361 int
362 in6_pcbconnect(inp, nam, cred)
363 register struct inpcb *inp;
364 struct sockaddr *nam;
365 struct ucred *cred;
366 {
367 struct in6_addr *addr6;
368 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
369 int error;
370
371 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
372 INP_LOCK_ASSERT(inp);
373
374 /*
375 * Call inner routine, to assign local interface address.
376 * in6_pcbladdr() may automatically fill in sin6_scope_id.
377 */
378 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
379 return (error);
380
381 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
382 sin6->sin6_port,
383 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
384 ? addr6 : &inp->in6p_laddr,
385 inp->inp_lport, 0, NULL) != NULL) {
386 return (EADDRINUSE);
387 }
388 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
389 if (inp->inp_lport == 0) {
390 error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
391 if (error)
392 return (error);
393 }
394 inp->in6p_laddr = *addr6;
395 }
396 inp->in6p_faddr = sin6->sin6_addr;
397 inp->inp_fport = sin6->sin6_port;
398 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
399 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
400 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
401 inp->in6p_flowinfo |=
402 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
403
404 in_pcbrehash(inp);
405 #ifdef IPSEC
406 if (inp->inp_socket->so_type == SOCK_STREAM)
407 ipsec_pcbconn(inp->inp_sp);
408 #endif
409 return (0);
410 }
411
412 void
413 in6_pcbdisconnect(inp)
414 struct inpcb *inp;
415 {
416
417 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
418 INP_LOCK_ASSERT(inp);
419
420 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
421 inp->inp_fport = 0;
422 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
423 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
424 in_pcbrehash(inp);
425 #ifdef IPSEC
426 ipsec_pcbdisconn(inp->inp_sp);
427 #endif
428 if (inp->inp_socket->so_state & SS_NOFDREF)
429 in6_pcbdetach(inp);
430 }
431
432 void
433 in6_pcbdetach(inp)
434 struct inpcb *inp;
435 {
436 struct socket *so = inp->inp_socket;
437 struct inpcbinfo *ipi = inp->inp_pcbinfo;
438
439 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
440 INP_LOCK_ASSERT(inp);
441
442 #if defined(IPSEC) || defined(FAST_IPSEC)
443 if (inp->in6p_sp != NULL)
444 ipsec6_delete_pcbpolicy(inp);
445 #endif /* IPSEC */
446 inp->inp_gencnt = ++ipi->ipi_gencnt;
447 in_pcbremlists(inp);
448
449 if (so) {
450 ACCEPT_LOCK();
451 SOCK_LOCK(so);
452 so->so_pcb = NULL;
453 sotryfree(so);
454 }
455
456 ip6_freepcbopts(inp->in6p_outputopts);
457 ip6_freemoptions(inp->in6p_moptions);
458 /* Check and free IPv4 related resources in case of mapped addr */
459 if (inp->inp_options)
460 (void)m_free(inp->inp_options);
461 ip_freemoptions(inp->inp_moptions);
462 inp->inp_vflag = 0;
463 #ifdef MAC
464 mac_destroy_inpcb(inp);
465 #endif
466 INP_UNLOCK(inp);
467 uma_zfree(ipi->ipi_zone, inp);
468 }
469
470 struct sockaddr *
471 in6_sockaddr(port, addr_p)
472 in_port_t port;
473 struct in6_addr *addr_p;
474 {
475 struct sockaddr_in6 *sin6;
476
477 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
478 bzero(sin6, sizeof *sin6);
479 sin6->sin6_family = AF_INET6;
480 sin6->sin6_len = sizeof(*sin6);
481 sin6->sin6_port = port;
482 sin6->sin6_addr = *addr_p;
483 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
484
485 return (struct sockaddr *)sin6;
486 }
487
488 struct sockaddr *
489 in6_v4mapsin6_sockaddr(port, addr_p)
490 in_port_t port;
491 struct in_addr *addr_p;
492 {
493 struct sockaddr_in sin;
494 struct sockaddr_in6 *sin6_p;
495
496 bzero(&sin, sizeof sin);
497 sin.sin_family = AF_INET;
498 sin.sin_len = sizeof(sin);
499 sin.sin_port = port;
500 sin.sin_addr = *addr_p;
501
502 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
503 M_WAITOK);
504 in6_sin_2_v4mapsin6(&sin, sin6_p);
505
506 return (struct sockaddr *)sin6_p;
507 }
508
509 /*
510 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
511 * modified to match the pru_sockaddr() and pru_peeraddr() entry points
512 * in struct pr_usrreqs, so that protocols can just reference then directly
513 * without the need for a wrapper function. The socket must have a valid
514 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
515 * except through a kernel programming error, so it is acceptable to panic
516 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap
517 * because there actually /is/ a programming error somewhere... XXX)
518 */
519 int
520 in6_setsockaddr(so, nam)
521 struct socket *so;
522 struct sockaddr **nam;
523 {
524 int s;
525 register struct inpcb *inp;
526 struct in6_addr addr;
527 in_port_t port;
528
529 s = splnet();
530 inp = sotoinpcb(so);
531 if (!inp) {
532 splx(s);
533 return EINVAL;
534 }
535 port = inp->inp_lport;
536 addr = inp->in6p_laddr;
537 splx(s);
538
539 *nam = in6_sockaddr(port, &addr);
540 return 0;
541 }
542
543 int
544 in6_setpeeraddr(so, nam)
545 struct socket *so;
546 struct sockaddr **nam;
547 {
548 int s;
549 struct inpcb *inp;
550 struct in6_addr addr;
551 in_port_t port;
552
553 s = splnet();
554 inp = sotoinpcb(so);
555 if (!inp) {
556 splx(s);
557 return EINVAL;
558 }
559 port = inp->inp_fport;
560 addr = inp->in6p_faddr;
561 splx(s);
562
563 *nam = in6_sockaddr(port, &addr);
564 return 0;
565 }
566
567 int
568 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
569 {
570 struct inpcb *inp = sotoinpcb(so);
571 int error;
572
573 if (inp == NULL)
574 return EINVAL;
575 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
576 error = in_setsockaddr(so, nam, &tcbinfo);
577 if (error == 0)
578 in6_sin_2_v4mapsin6_in_sock(nam);
579 } else {
580 /* scope issues will be handled in in6_setsockaddr(). */
581 error = in6_setsockaddr(so, nam);
582 }
583
584 return error;
585 }
586
587 int
588 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
589 {
590 struct inpcb *inp = sotoinpcb(so);
591 int error;
592
593 if (inp == NULL)
594 return EINVAL;
595 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
596 error = in_setpeeraddr(so, nam, &tcbinfo);
597 if (error == 0)
598 in6_sin_2_v4mapsin6_in_sock(nam);
599 } else
600 /* scope issues will be handled in in6_setpeeraddr(). */
601 error = in6_setpeeraddr(so, nam);
602
603 return error;
604 }
605
606 /*
607 * Pass some notification to all connections of a protocol
608 * associated with address dst. The local address and/or port numbers
609 * may be specified to limit the search. The "usual action" will be
610 * taken, depending on the ctlinput cmd. The caller must filter any
611 * cmds that are uninteresting (e.g., no error in the map).
612 * Call the protocol specific routine (if any) to report
613 * any errors for each matching socket.
614 *
615 * Must be called at splnet.
616 */
617 void
618 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
619 u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
620 int cmd, void *cmdarg, struct inpcb *(*notify)(struct inpcb *, int))
621 {
622 struct inpcbhead *head;
623 struct inpcb *inp, *ninp;
624 struct sockaddr_in6 sa6_src, *sa6_dst;
625 u_short fport = fport_arg, lport = lport_arg;
626 u_int32_t flowinfo;
627 int errno, s;
628
629 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
630 return;
631
632 sa6_dst = (struct sockaddr_in6 *)dst;
633 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
634 return;
635
636 /*
637 * note that src can be NULL when we get notify by local fragmentation.
638 */
639 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
640 flowinfo = sa6_src.sin6_flowinfo;
641
642 /*
643 * Redirects go to all references to the destination,
644 * and use in6_rtchange to invalidate the route cache.
645 * Dead host indications: also use in6_rtchange to invalidate
646 * the cache, and deliver the error to all the sockets.
647 * Otherwise, if we have knowledge of the local port and address,
648 * deliver only to that socket.
649 */
650 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
651 fport = 0;
652 lport = 0;
653 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
654
655 if (cmd != PRC_HOSTDEAD)
656 notify = in6_rtchange;
657 }
658 errno = inet6ctlerrmap[cmd];
659 s = splnet();
660 head = pcbinfo->listhead;
661 INP_INFO_WLOCK(pcbinfo);
662 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
663 INP_LOCK(inp);
664 ninp = LIST_NEXT(inp, inp_list);
665
666 if ((inp->inp_vflag & INP_IPV6) == 0) {
667 INP_UNLOCK(inp);
668 continue;
669 }
670
671 /*
672 * If the error designates a new path MTU for a destination
673 * and the application (associated with this socket) wanted to
674 * know the value, notify. Note that we notify for all
675 * disconnected sockets if the corresponding application
676 * wanted. This is because some UDP applications keep sending
677 * sockets disconnected.
678 * XXX: should we avoid to notify the value to TCP sockets?
679 */
680 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
681 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
682 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
683 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
684 (u_int32_t *)cmdarg);
685 }
686
687 /*
688 * Detect if we should notify the error. If no source and
689 * destination ports are specifed, but non-zero flowinfo and
690 * local address match, notify the error. This is the case
691 * when the error is delivered with an encrypted buffer
692 * by ESP. Otherwise, just compare addresses and ports
693 * as usual.
694 */
695 if (lport == 0 && fport == 0 && flowinfo &&
696 inp->inp_socket != NULL &&
697 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
698 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
699 goto do_notify;
700 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
701 &sa6_dst->sin6_addr) ||
702 inp->inp_socket == 0 ||
703 (lport && inp->inp_lport != lport) ||
704 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
705 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
706 &sa6_src.sin6_addr)) ||
707 (fport && inp->inp_fport != fport)) {
708 INP_UNLOCK(inp);
709 continue;
710 }
711
712 do_notify:
713 if (notify) {
714 if ((*notify)(inp, errno))
715 INP_UNLOCK(inp);
716 } else
717 INP_UNLOCK(inp);
718 }
719 INP_INFO_WUNLOCK(pcbinfo);
720 splx(s);
721 }
722
723 /*
724 * Lookup a PCB based on the local address and port.
725 */
726 struct inpcb *
727 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
728 struct inpcbinfo *pcbinfo;
729 struct in6_addr *laddr;
730 u_int lport_arg;
731 int wild_okay;
732 {
733 register struct inpcb *inp;
734 int matchwild = 3, wildcard;
735 u_short lport = lport_arg;
736
737 if (!wild_okay) {
738 struct inpcbhead *head;
739 /*
740 * Look for an unconnected (wildcard foreign addr) PCB that
741 * matches the local address and port we're looking for.
742 */
743 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
744 pcbinfo->hashmask)];
745 LIST_FOREACH(inp, head, inp_hash) {
746 if ((inp->inp_vflag & INP_IPV6) == 0)
747 continue;
748 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
749 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
750 inp->inp_lport == lport) {
751 /*
752 * Found.
753 */
754 return (inp);
755 }
756 }
757 /*
758 * Not found.
759 */
760 return (NULL);
761 } else {
762 struct inpcbporthead *porthash;
763 struct inpcbport *phd;
764 struct inpcb *match = NULL;
765 /*
766 * Best fit PCB lookup.
767 *
768 * First see if this local port is in use by looking on the
769 * port hash list.
770 */
771 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
772 pcbinfo->porthashmask)];
773 LIST_FOREACH(phd, porthash, phd_hash) {
774 if (phd->phd_port == lport)
775 break;
776 }
777 if (phd != NULL) {
778 /*
779 * Port is in use by one or more PCBs. Look for best
780 * fit.
781 */
782 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
783 wildcard = 0;
784 if ((inp->inp_vflag & INP_IPV6) == 0)
785 continue;
786 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
787 wildcard++;
788 if (!IN6_IS_ADDR_UNSPECIFIED(
789 &inp->in6p_laddr)) {
790 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
791 wildcard++;
792 else if (!IN6_ARE_ADDR_EQUAL(
793 &inp->in6p_laddr, laddr))
794 continue;
795 } else {
796 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
797 wildcard++;
798 }
799 if (wildcard < matchwild) {
800 match = inp;
801 matchwild = wildcard;
802 if (matchwild == 0) {
803 break;
804 }
805 }
806 }
807 }
808 return (match);
809 }
810 }
811
812 void
813 in6_pcbpurgeif0(head, ifp)
814 struct in6pcb *head;
815 struct ifnet *ifp;
816 {
817 struct in6pcb *in6p;
818 struct ip6_moptions *im6o;
819 struct in6_multi_mship *imm, *nimm;
820
821 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
822 im6o = in6p->in6p_moptions;
823 if ((in6p->inp_vflag & INP_IPV6) &&
824 im6o) {
825 /*
826 * Unselect the outgoing interface if it is being
827 * detached.
828 */
829 if (im6o->im6o_multicast_ifp == ifp)
830 im6o->im6o_multicast_ifp = NULL;
831
832 /*
833 * Drop multicast group membership if we joined
834 * through the interface being detached.
835 * XXX controversial - is it really legal for kernel
836 * to force this?
837 */
838 for (imm = im6o->im6o_memberships.lh_first;
839 imm != NULL; imm = nimm) {
840 nimm = imm->i6mm_chain.le_next;
841 if (imm->i6mm_maddr->in6m_ifp == ifp) {
842 LIST_REMOVE(imm, i6mm_chain);
843 in6_delmulti(imm->i6mm_maddr);
844 free(imm, M_IP6MADDR);
845 }
846 }
847 }
848 }
849 }
850
851 /*
852 * Check for alternatives when higher level complains
853 * about service problems. For now, invalidate cached
854 * routing information. If the route was created dynamically
855 * (by a redirect), time to try a default gateway again.
856 */
857 void
858 in6_losing(in6p)
859 struct inpcb *in6p;
860 {
861 /*
862 * We don't store route pointers in the routing table anymore
863 */
864 return;
865 }
866
867 /*
868 * After a routing change, flush old routing
869 * and allocate a (hopefully) better one.
870 */
871 struct inpcb *
872 in6_rtchange(inp, errno)
873 struct inpcb *inp;
874 int errno;
875 {
876 /*
877 * We don't store route pointers in the routing table anymore
878 */
879 return inp;
880 }
881
882 /*
883 * Lookup PCB in hash list.
884 */
885 struct inpcb *
886 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
887 struct inpcbinfo *pcbinfo;
888 struct in6_addr *faddr, *laddr;
889 u_int fport_arg, lport_arg;
890 int wildcard;
891 struct ifnet *ifp;
892 {
893 struct inpcbhead *head;
894 register struct inpcb *inp;
895 u_short fport = fport_arg, lport = lport_arg;
896 int faith;
897
898 if (faithprefix_p != NULL)
899 faith = (*faithprefix_p)(laddr);
900 else
901 faith = 0;
902
903 /*
904 * First look for an exact match.
905 */
906 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */,
907 lport, fport,
908 pcbinfo->hashmask)];
909 LIST_FOREACH(inp, head, inp_hash) {
910 if ((inp->inp_vflag & INP_IPV6) == 0)
911 continue;
912 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
913 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
914 inp->inp_fport == fport &&
915 inp->inp_lport == lport) {
916 /*
917 * Found.
918 */
919 return (inp);
920 }
921 }
922 if (wildcard) {
923 struct inpcb *local_wild = NULL;
924
925 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
926 pcbinfo->hashmask)];
927 LIST_FOREACH(inp, head, inp_hash) {
928 if ((inp->inp_vflag & INP_IPV6) == 0)
929 continue;
930 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
931 inp->inp_lport == lport) {
932 if (faith && (inp->inp_flags & INP_FAITH) == 0)
933 continue;
934 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
935 laddr))
936 return (inp);
937 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
938 local_wild = inp;
939 }
940 }
941 return (local_wild);
942 }
943
944 /*
945 * Not found.
946 */
947 return (NULL);
948 }
949
950 void
951 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
952 {
953 struct ip6_hdr *ip;
954
955 ip = mtod(m, struct ip6_hdr *);
956 bzero(sin6, sizeof(*sin6));
957 sin6->sin6_len = sizeof(*sin6);
958 sin6->sin6_family = AF_INET6;
959 sin6->sin6_addr = ip->ip6_src;
960
961 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
962
963 return;
964 }
Cache object: 0e7864503fd0f0b58cf151de56cfe727
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