1 /* $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.59.2.3 2005/01/31 23:26:39 imp Exp $ */
2 /* $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ */
3
4 /*-
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33
34 /*-
35 * Copyright (c) 1982, 1986, 1991, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 4. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
63 */
64
65 #include "opt_inet.h"
66 #include "opt_inet6.h"
67 #include "opt_ipsec.h"
68
69 #include <sys/param.h>
70 #include <sys/systm.h>
71 #include <sys/malloc.h>
72 #include <sys/mbuf.h>
73 #include <sys/domain.h>
74 #include <sys/protosw.h>
75 #include <sys/socket.h>
76 #include <sys/socketvar.h>
77 #include <sys/sockio.h>
78 #include <sys/errno.h>
79 #include <sys/time.h>
80 #include <sys/proc.h>
81 #include <sys/jail.h>
82
83 #include <vm/uma.h>
84
85 #include <net/if.h>
86 #include <net/if_types.h>
87 #include <net/route.h>
88
89 #include <netinet/in.h>
90 #include <netinet/in_var.h>
91 #include <netinet/in_systm.h>
92 #include <netinet/tcp_var.h>
93 #include <netinet/ip6.h>
94 #include <netinet/ip_var.h>
95 #include <netinet6/ip6_var.h>
96 #include <netinet6/nd6.h>
97 #include <netinet/in_pcb.h>
98 #include <netinet6/in6_pcb.h>
99
100 #ifdef IPSEC
101 #include <netinet6/ipsec.h>
102 #ifdef INET6
103 #include <netinet6/ipsec6.h>
104 #endif
105 #include <netinet6/ah.h>
106 #ifdef INET6
107 #include <netinet6/ah6.h>
108 #endif
109 #include <netkey/key.h>
110 #endif /* IPSEC */
111
112 #ifdef FAST_IPSEC
113 #include <netipsec/ipsec.h>
114 #include <netipsec/ipsec6.h>
115 #include <netipsec/key.h>
116 #endif /* FAST_IPSEC */
117
118 struct in6_addr zeroin6_addr;
119
120 int
121 in6_pcbbind(inp, nam, cred)
122 register struct inpcb *inp;
123 struct sockaddr *nam;
124 struct ucred *cred;
125 {
126 struct socket *so = inp->inp_socket;
127 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
128 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
129 u_short lport = 0;
130 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
131
132 INP_INFO_WLOCK_ASSERT(pcbinfo);
133 INP_LOCK_ASSERT(inp);
134
135 if (!in6_ifaddr) /* XXX broken! */
136 return (EADDRNOTAVAIL);
137 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
138 return (EINVAL);
139 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
140 wild = 1;
141 if (nam) {
142 sin6 = (struct sockaddr_in6 *)nam;
143 if (nam->sa_len != sizeof(*sin6))
144 return (EINVAL);
145 /*
146 * family check.
147 */
148 if (nam->sa_family != AF_INET6)
149 return (EAFNOSUPPORT);
150
151 /* KAME hack: embed scopeid */
152 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
153 return EINVAL;
154 /* this must be cleared for ifa_ifwithaddr() */
155 sin6->sin6_scope_id = 0;
156
157 lport = sin6->sin6_port;
158 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
159 /*
160 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
161 * allow compepte duplication of binding if
162 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
163 * and a multicast address is bound on both
164 * new and duplicated sockets.
165 */
166 if (so->so_options & SO_REUSEADDR)
167 reuseport = SO_REUSEADDR|SO_REUSEPORT;
168 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
169 struct ifaddr *ia = NULL;
170
171 sin6->sin6_port = 0; /* yech... */
172 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
173 return (EADDRNOTAVAIL);
174
175 /*
176 * XXX: bind to an anycast address might accidentally
177 * cause sending a packet with anycast source address.
178 * We should allow to bind to a deprecated address, since
179 * the application dares to use it.
180 */
181 if (ia &&
182 ((struct in6_ifaddr *)ia)->ia6_flags &
183 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
184 return (EADDRNOTAVAIL);
185 }
186 }
187 if (lport) {
188 struct inpcb *t;
189
190 /* GROSS */
191 if (ntohs(lport) < IPV6PORT_RESERVED &&
192 suser_cred(cred, SUSER_ALLOWJAIL))
193 return (EACCES);
194 if (so->so_cred->cr_uid != 0 &&
195 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
196 t = in6_pcblookup_local(pcbinfo,
197 &sin6->sin6_addr, lport,
198 INPLOOKUP_WILDCARD);
199 if (t &&
200 ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
201 (so->so_type != SOCK_STREAM ||
202 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
203 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
204 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
205 (t->inp_socket->so_options & SO_REUSEPORT)
206 == 0) && (so->so_cred->cr_uid !=
207 t->inp_socket->so_cred->cr_uid))
208 return (EADDRINUSE);
209 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
210 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
211 struct sockaddr_in sin;
212
213 in6_sin6_2_sin(&sin, sin6);
214 t = in_pcblookup_local(pcbinfo,
215 sin.sin_addr, lport,
216 INPLOOKUP_WILDCARD);
217 if (t &&
218 ((t->inp_vflag &
219 INP_TIMEWAIT) == 0) &&
220 (so->so_type != SOCK_STREAM ||
221 ntohl(t->inp_faddr.s_addr) ==
222 INADDR_ANY) &&
223 (so->so_cred->cr_uid !=
224 t->inp_socket->so_cred->cr_uid))
225 return (EADDRINUSE);
226 }
227 }
228 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
229 lport, wild);
230 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ?
231 intotw(t)->tw_so_options :
232 t->inp_socket->so_options)) == 0)
233 return (EADDRINUSE);
234 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
235 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
236 struct sockaddr_in sin;
237
238 in6_sin6_2_sin(&sin, sin6);
239 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
240 lport, wild);
241 if (t && t->inp_vflag & INP_TIMEWAIT) {
242 if ((reuseport &
243 intotw(t)->tw_so_options) == 0 &&
244 (ntohl(t->inp_laddr.s_addr) !=
245 INADDR_ANY || ((inp->inp_vflag &
246 INP_IPV6PROTO) ==
247 (t->inp_vflag & INP_IPV6PROTO))))
248 return (EADDRINUSE);
249 }
250 else if (t &&
251 (reuseport & t->inp_socket->so_options)
252 == 0 && (ntohl(t->inp_laddr.s_addr) !=
253 INADDR_ANY || INP_SOCKAF(so) ==
254 INP_SOCKAF(t->inp_socket)))
255 return (EADDRINUSE);
256 }
257 }
258 inp->in6p_laddr = sin6->sin6_addr;
259 }
260 if (lport == 0) {
261 int e;
262 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0)
263 return (e);
264 }
265 else {
266 inp->inp_lport = lport;
267 if (in_pcbinshash(inp) != 0) {
268 inp->in6p_laddr = in6addr_any;
269 inp->inp_lport = 0;
270 return (EAGAIN);
271 }
272 }
273 return (0);
274 }
275
276 /*
277 * Transform old in6_pcbconnect() into an inner subroutine for new
278 * in6_pcbconnect(): Do some validity-checking on the remote
279 * address (in mbuf 'nam') and then determine local host address
280 * (i.e., which interface) to use to access that remote host.
281 *
282 * This preserves definition of in6_pcbconnect(), while supporting a
283 * slightly different version for T/TCP. (This is more than
284 * a bit of a kludge, but cleaning up the internal interfaces would
285 * have forced minor changes in every protocol).
286 */
287
288 int
289 in6_pcbladdr(inp, nam, plocal_addr6)
290 register struct inpcb *inp;
291 struct sockaddr *nam;
292 struct in6_addr **plocal_addr6;
293 {
294 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
295 struct ifnet *ifp = NULL;
296 int error = 0;
297
298 if (nam->sa_len != sizeof (*sin6))
299 return (EINVAL);
300 if (sin6->sin6_family != AF_INET6)
301 return (EAFNOSUPPORT);
302 if (sin6->sin6_port == 0)
303 return (EADDRNOTAVAIL);
304
305 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
306 INP_LOCK_ASSERT(inp);
307
308 /* KAME hack: embed scopeid */
309 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
310 return EINVAL;
311
312 if (in6_ifaddr) {
313 /*
314 * If the destination address is UNSPECIFIED addr,
315 * use the loopback addr, e.g ::1.
316 */
317 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
318 sin6->sin6_addr = in6addr_loopback;
319 }
320 {
321 /*
322 * XXX: in6_selectsrc might replace the bound local address
323 * with the address specified by setsockopt(IPV6_PKTINFO).
324 * Is it the intended behavior?
325 */
326 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
327 inp->in6p_moptions, NULL,
328 &inp->in6p_laddr, &error);
329 if (*plocal_addr6 == 0) {
330 if (error == 0)
331 error = EADDRNOTAVAIL;
332 return (error);
333 }
334 /*
335 * Don't do pcblookup call here; return interface in
336 * plocal_addr6
337 * and exit to caller, that will do the lookup.
338 */
339 }
340 return (0);
341 }
342
343 /*
344 * Outer subroutine:
345 * Connect from a socket to a specified address.
346 * Both address and port must be specified in argument sin.
347 * If don't have a local address for this socket yet,
348 * then pick one.
349 */
350 int
351 in6_pcbconnect(inp, nam, cred)
352 register struct inpcb *inp;
353 struct sockaddr *nam;
354 struct ucred *cred;
355 {
356 struct in6_addr *addr6;
357 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
358 int error;
359
360 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
361 INP_LOCK_ASSERT(inp);
362
363 /*
364 * Call inner routine, to assign local interface address.
365 * in6_pcbladdr() may automatically fill in sin6_scope_id.
366 */
367 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
368 return (error);
369
370 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
371 sin6->sin6_port,
372 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
373 ? addr6 : &inp->in6p_laddr,
374 inp->inp_lport, 0, NULL) != NULL) {
375 return (EADDRINUSE);
376 }
377 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
378 if (inp->inp_lport == 0) {
379 error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
380 if (error)
381 return (error);
382 }
383 inp->in6p_laddr = *addr6;
384 }
385 inp->in6p_faddr = sin6->sin6_addr;
386 inp->inp_fport = sin6->sin6_port;
387 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
388 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
389 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
390 inp->in6p_flowinfo |=
391 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
392
393 in_pcbrehash(inp);
394 #ifdef IPSEC
395 if (inp->inp_socket->so_type == SOCK_STREAM)
396 ipsec_pcbconn(inp->inp_sp);
397 #endif
398 return (0);
399 }
400
401 void
402 in6_pcbdisconnect(inp)
403 struct inpcb *inp;
404 {
405
406 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
407 INP_LOCK_ASSERT(inp);
408
409 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
410 inp->inp_fport = 0;
411 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
412 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
413 in_pcbrehash(inp);
414 #ifdef IPSEC
415 ipsec_pcbdisconn(inp->inp_sp);
416 #endif
417 if (inp->inp_socket->so_state & SS_NOFDREF)
418 in6_pcbdetach(inp);
419 }
420
421 void
422 in6_pcbdetach(inp)
423 struct inpcb *inp;
424 {
425 struct socket *so = inp->inp_socket;
426 struct inpcbinfo *ipi = inp->inp_pcbinfo;
427
428 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
429 INP_LOCK_ASSERT(inp);
430
431 #if defined(IPSEC) || defined(FAST_IPSEC)
432 if (inp->in6p_sp != NULL)
433 ipsec6_delete_pcbpolicy(inp);
434 #endif /* IPSEC */
435 inp->inp_gencnt = ++ipi->ipi_gencnt;
436 in_pcbremlists(inp);
437
438 if (so) {
439 ACCEPT_LOCK();
440 SOCK_LOCK(so);
441 so->so_pcb = NULL;
442 sotryfree(so);
443 }
444
445 ip6_freepcbopts(inp->in6p_outputopts);
446 ip6_freemoptions(inp->in6p_moptions);
447 /* Check and free IPv4 related resources in case of mapped addr */
448 if (inp->inp_options)
449 (void)m_free(inp->inp_options);
450 ip_freemoptions(inp->inp_moptions);
451 inp->inp_vflag = 0;
452 INP_LOCK_DESTROY(inp);
453 uma_zfree(ipi->ipi_zone, inp);
454 }
455
456 struct sockaddr *
457 in6_sockaddr(port, addr_p)
458 in_port_t port;
459 struct in6_addr *addr_p;
460 {
461 struct sockaddr_in6 *sin6;
462
463 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
464 bzero(sin6, sizeof *sin6);
465 sin6->sin6_family = AF_INET6;
466 sin6->sin6_len = sizeof(*sin6);
467 sin6->sin6_port = port;
468 sin6->sin6_addr = *addr_p;
469 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
470 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
471 else
472 sin6->sin6_scope_id = 0; /*XXX*/
473 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
474 sin6->sin6_addr.s6_addr16[1] = 0;
475
476 return (struct sockaddr *)sin6;
477 }
478
479 struct sockaddr *
480 in6_v4mapsin6_sockaddr(port, addr_p)
481 in_port_t port;
482 struct in_addr *addr_p;
483 {
484 struct sockaddr_in sin;
485 struct sockaddr_in6 *sin6_p;
486
487 bzero(&sin, sizeof sin);
488 sin.sin_family = AF_INET;
489 sin.sin_len = sizeof(sin);
490 sin.sin_port = port;
491 sin.sin_addr = *addr_p;
492
493 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
494 M_WAITOK);
495 in6_sin_2_v4mapsin6(&sin, sin6_p);
496
497 return (struct sockaddr *)sin6_p;
498 }
499
500 /*
501 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
502 * modified to match the pru_sockaddr() and pru_peeraddr() entry points
503 * in struct pr_usrreqs, so that protocols can just reference then directly
504 * without the need for a wrapper function. The socket must have a valid
505 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
506 * except through a kernel programming error, so it is acceptable to panic
507 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap
508 * because there actually /is/ a programming error somewhere... XXX)
509 */
510 int
511 in6_setsockaddr(so, nam)
512 struct socket *so;
513 struct sockaddr **nam;
514 {
515 int s;
516 register struct inpcb *inp;
517 struct in6_addr addr;
518 in_port_t port;
519
520 s = splnet();
521 inp = sotoinpcb(so);
522 if (!inp) {
523 splx(s);
524 return EINVAL;
525 }
526 port = inp->inp_lport;
527 addr = inp->in6p_laddr;
528 splx(s);
529
530 *nam = in6_sockaddr(port, &addr);
531 return 0;
532 }
533
534 int
535 in6_setpeeraddr(so, nam)
536 struct socket *so;
537 struct sockaddr **nam;
538 {
539 int s;
540 struct inpcb *inp;
541 struct in6_addr addr;
542 in_port_t port;
543
544 s = splnet();
545 inp = sotoinpcb(so);
546 if (!inp) {
547 splx(s);
548 return EINVAL;
549 }
550 port = inp->inp_fport;
551 addr = inp->in6p_faddr;
552 splx(s);
553
554 *nam = in6_sockaddr(port, &addr);
555 return 0;
556 }
557
558 int
559 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
560 {
561 struct inpcb *inp = sotoinpcb(so);
562 int error;
563
564 if (inp == NULL)
565 return EINVAL;
566 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
567 error = in_setsockaddr(so, nam, &tcbinfo);
568 if (error == 0)
569 in6_sin_2_v4mapsin6_in_sock(nam);
570 } else {
571 /* scope issues will be handled in in6_setsockaddr(). */
572 error = in6_setsockaddr(so, nam);
573 }
574
575 return error;
576 }
577
578 int
579 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
580 {
581 struct inpcb *inp = sotoinpcb(so);
582 int error;
583
584 if (inp == NULL)
585 return EINVAL;
586 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
587 error = in_setpeeraddr(so, nam, &tcbinfo);
588 if (error == 0)
589 in6_sin_2_v4mapsin6_in_sock(nam);
590 } else
591 /* scope issues will be handled in in6_setpeeraddr(). */
592 error = in6_setpeeraddr(so, nam);
593
594 return error;
595 }
596
597 /*
598 * Pass some notification to all connections of a protocol
599 * associated with address dst. The local address and/or port numbers
600 * may be specified to limit the search. The "usual action" will be
601 * taken, depending on the ctlinput cmd. The caller must filter any
602 * cmds that are uninteresting (e.g., no error in the map).
603 * Call the protocol specific routine (if any) to report
604 * any errors for each matching socket.
605 *
606 * Must be called at splnet.
607 */
608 void
609 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify)
610 struct inpcbinfo *pcbinfo;
611 struct sockaddr *dst;
612 const struct sockaddr *src;
613 u_int fport_arg, lport_arg;
614 int cmd;
615 void *cmdarg;
616 struct inpcb *(*notify) __P((struct inpcb *, int));
617 {
618 struct inpcbhead *head;
619 struct inpcb *inp, *ninp;
620 struct sockaddr_in6 sa6_src, *sa6_dst;
621 u_short fport = fport_arg, lport = lport_arg;
622 u_int32_t flowinfo;
623 int errno, s;
624
625 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
626 return;
627
628 sa6_dst = (struct sockaddr_in6 *)dst;
629 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
630 return;
631
632 /*
633 * note that src can be NULL when we get notify by local fragmentation.
634 */
635 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
636 flowinfo = sa6_src.sin6_flowinfo;
637
638 /*
639 * Redirects go to all references to the destination,
640 * and use in6_rtchange to invalidate the route cache.
641 * Dead host indications: also use in6_rtchange to invalidate
642 * the cache, and deliver the error to all the sockets.
643 * Otherwise, if we have knowledge of the local port and address,
644 * deliver only to that socket.
645 */
646 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
647 fport = 0;
648 lport = 0;
649 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
650
651 if (cmd != PRC_HOSTDEAD)
652 notify = in6_rtchange;
653 }
654 errno = inet6ctlerrmap[cmd];
655 s = splnet();
656 head = pcbinfo->listhead;
657 INP_INFO_WLOCK(pcbinfo);
658 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
659 INP_LOCK(inp);
660 ninp = LIST_NEXT(inp, inp_list);
661
662 if ((inp->inp_vflag & INP_IPV6) == 0) {
663 INP_UNLOCK(inp);
664 continue;
665 }
666
667 /*
668 * If the error designates a new path MTU for a destination
669 * and the application (associated with this socket) wanted to
670 * know the value, notify. Note that we notify for all
671 * disconnected sockets if the corresponding application
672 * wanted. This is because some UDP applications keep sending
673 * sockets disconnected.
674 * XXX: should we avoid to notify the value to TCP sockets?
675 */
676 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
677 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
678 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
679 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
680 (u_int32_t *)cmdarg);
681 }
682
683 /*
684 * Detect if we should notify the error. If no source and
685 * destination ports are specifed, but non-zero flowinfo and
686 * local address match, notify the error. This is the case
687 * when the error is delivered with an encrypted buffer
688 * by ESP. Otherwise, just compare addresses and ports
689 * as usual.
690 */
691 if (lport == 0 && fport == 0 && flowinfo &&
692 inp->inp_socket != NULL &&
693 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
694 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
695 goto do_notify;
696 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
697 &sa6_dst->sin6_addr) ||
698 inp->inp_socket == 0 ||
699 (lport && inp->inp_lport != lport) ||
700 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
701 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
702 &sa6_src.sin6_addr)) ||
703 (fport && inp->inp_fport != fport)) {
704 INP_UNLOCK(inp);
705 continue;
706 }
707
708 do_notify:
709 if (notify) {
710 if ((*notify)(inp, errno))
711 INP_UNLOCK(inp);
712 } else
713 INP_UNLOCK(inp);
714 }
715 INP_INFO_WUNLOCK(pcbinfo);
716 splx(s);
717 }
718
719 /*
720 * Lookup a PCB based on the local address and port.
721 */
722 struct inpcb *
723 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
724 struct inpcbinfo *pcbinfo;
725 struct in6_addr *laddr;
726 u_int lport_arg;
727 int wild_okay;
728 {
729 register struct inpcb *inp;
730 int matchwild = 3, wildcard;
731 u_short lport = lport_arg;
732
733 if (!wild_okay) {
734 struct inpcbhead *head;
735 /*
736 * Look for an unconnected (wildcard foreign addr) PCB that
737 * matches the local address and port we're looking for.
738 */
739 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
740 pcbinfo->hashmask)];
741 LIST_FOREACH(inp, head, inp_hash) {
742 if ((inp->inp_vflag & INP_IPV6) == 0)
743 continue;
744 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
745 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
746 inp->inp_lport == lport) {
747 /*
748 * Found.
749 */
750 return (inp);
751 }
752 }
753 /*
754 * Not found.
755 */
756 return (NULL);
757 } else {
758 struct inpcbporthead *porthash;
759 struct inpcbport *phd;
760 struct inpcb *match = NULL;
761 /*
762 * Best fit PCB lookup.
763 *
764 * First see if this local port is in use by looking on the
765 * port hash list.
766 */
767 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
768 pcbinfo->porthashmask)];
769 LIST_FOREACH(phd, porthash, phd_hash) {
770 if (phd->phd_port == lport)
771 break;
772 }
773 if (phd != NULL) {
774 /*
775 * Port is in use by one or more PCBs. Look for best
776 * fit.
777 */
778 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
779 wildcard = 0;
780 if ((inp->inp_vflag & INP_IPV6) == 0)
781 continue;
782 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
783 wildcard++;
784 if (!IN6_IS_ADDR_UNSPECIFIED(
785 &inp->in6p_laddr)) {
786 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
787 wildcard++;
788 else if (!IN6_ARE_ADDR_EQUAL(
789 &inp->in6p_laddr, laddr))
790 continue;
791 } else {
792 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
793 wildcard++;
794 }
795 if (wildcard < matchwild) {
796 match = inp;
797 matchwild = wildcard;
798 if (matchwild == 0) {
799 break;
800 }
801 }
802 }
803 }
804 return (match);
805 }
806 }
807
808 void
809 in6_pcbpurgeif0(head, ifp)
810 struct in6pcb *head;
811 struct ifnet *ifp;
812 {
813 struct in6pcb *in6p;
814 struct ip6_moptions *im6o;
815 struct in6_multi_mship *imm, *nimm;
816
817 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
818 im6o = in6p->in6p_moptions;
819 if ((in6p->inp_vflag & INP_IPV6) &&
820 im6o) {
821 /*
822 * Unselect the outgoing interface if it is being
823 * detached.
824 */
825 if (im6o->im6o_multicast_ifp == ifp)
826 im6o->im6o_multicast_ifp = NULL;
827
828 /*
829 * Drop multicast group membership if we joined
830 * through the interface being detached.
831 * XXX controversial - is it really legal for kernel
832 * to force this?
833 */
834 for (imm = im6o->im6o_memberships.lh_first;
835 imm != NULL; imm = nimm) {
836 nimm = imm->i6mm_chain.le_next;
837 if (imm->i6mm_maddr->in6m_ifp == ifp) {
838 LIST_REMOVE(imm, i6mm_chain);
839 in6_delmulti(imm->i6mm_maddr);
840 free(imm, M_IPMADDR);
841 }
842 }
843 }
844 }
845 }
846
847 /*
848 * Check for alternatives when higher level complains
849 * about service problems. For now, invalidate cached
850 * routing information. If the route was created dynamically
851 * (by a redirect), time to try a default gateway again.
852 */
853 void
854 in6_losing(in6p)
855 struct inpcb *in6p;
856 {
857 /*
858 * We don't store route pointers in the routing table anymore
859 */
860 return;
861 }
862
863 /*
864 * After a routing change, flush old routing
865 * and allocate a (hopefully) better one.
866 */
867 struct inpcb *
868 in6_rtchange(inp, errno)
869 struct inpcb *inp;
870 int errno;
871 {
872 /*
873 * We don't store route pointers in the routing table anymore
874 */
875 return inp;
876 }
877
878 /*
879 * Lookup PCB in hash list.
880 */
881 struct inpcb *
882 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
883 struct inpcbinfo *pcbinfo;
884 struct in6_addr *faddr, *laddr;
885 u_int fport_arg, lport_arg;
886 int wildcard;
887 struct ifnet *ifp;
888 {
889 struct inpcbhead *head;
890 register struct inpcb *inp;
891 u_short fport = fport_arg, lport = lport_arg;
892 int faith;
893
894 if (faithprefix_p != NULL)
895 faith = (*faithprefix_p)(laddr);
896 else
897 faith = 0;
898
899 /*
900 * First look for an exact match.
901 */
902 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */,
903 lport, fport,
904 pcbinfo->hashmask)];
905 LIST_FOREACH(inp, head, inp_hash) {
906 if ((inp->inp_vflag & INP_IPV6) == 0)
907 continue;
908 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
909 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
910 inp->inp_fport == fport &&
911 inp->inp_lport == lport) {
912 /*
913 * Found.
914 */
915 return (inp);
916 }
917 }
918 if (wildcard) {
919 struct inpcb *local_wild = NULL;
920
921 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
922 pcbinfo->hashmask)];
923 LIST_FOREACH(inp, head, inp_hash) {
924 if ((inp->inp_vflag & INP_IPV6) == 0)
925 continue;
926 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
927 inp->inp_lport == lport) {
928 if (faith && (inp->inp_flags & INP_FAITH) == 0)
929 continue;
930 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
931 laddr))
932 return (inp);
933 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
934 local_wild = inp;
935 }
936 }
937 return (local_wild);
938 }
939
940 /*
941 * Not found.
942 */
943 return (NULL);
944 }
945
946 void
947 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
948 {
949 struct ip6_hdr *ip;
950
951 ip = mtod(m, struct ip6_hdr *);
952 bzero(sin6, sizeof(*sin6));
953 sin6->sin6_len = sizeof(*sin6);
954 sin6->sin6_family = AF_INET6;
955 sin6->sin6_addr = ip->ip6_src;
956 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
957 sin6->sin6_addr.s6_addr16[1] = 0;
958 sin6->sin6_scope_id =
959 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
960 ? m->m_pkthdr.rcvif->if_index : 0;
961
962 return;
963 }
Cache object: b310ebcb02e601c914a341d4a5a25e98
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