1 /* $NetBSD: in6_pcb.c,v 1.147 2016/07/15 07:40:09 ozaki-r Exp $ */
2 /* $KAME: in6_pcb.c,v 1.84 2001/02/08 18:02:08 itojun 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 * Copyright (c) 1982, 1986, 1991, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
62 */
63
64 #include <sys/cdefs.h>
65 __KERNEL_RCSID(0, "$NetBSD: in6_pcb.c,v 1.147 2016/07/15 07:40:09 ozaki-r Exp $");
66
67 #ifdef _KERNEL_OPT
68 #include "opt_inet.h"
69 #include "opt_ipsec.h"
70 #endif
71
72 #include <sys/param.h>
73 #include <sys/systm.h>
74 #include <sys/mbuf.h>
75 #include <sys/protosw.h>
76 #include <sys/socket.h>
77 #include <sys/socketvar.h>
78 #include <sys/ioctl.h>
79 #include <sys/errno.h>
80 #include <sys/time.h>
81 #include <sys/proc.h>
82 #include <sys/kauth.h>
83 #include <sys/domain.h>
84 #include <sys/once.h>
85
86 #include <net/if.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/ip.h>
93 #include <netinet/in_pcb.h>
94 #include <netinet/ip6.h>
95 #include <netinet/portalgo.h>
96 #include <netinet6/ip6_var.h>
97 #include <netinet6/in6_pcb.h>
98 #include <netinet6/scope6_var.h>
99 #include <netinet6/nd6.h>
100
101 #include "faith.h"
102
103 #ifdef IPSEC
104 #include <netipsec/ipsec.h>
105 #include <netipsec/ipsec6.h>
106 #include <netipsec/key.h>
107 #endif /* IPSEC */
108
109 #include <netinet/tcp_vtw.h>
110
111 const struct in6_addr zeroin6_addr;
112
113 #define IN6PCBHASH_PORT(table, lport) \
114 &(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash]
115 #define IN6PCBHASH_BIND(table, laddr, lport) \
116 &(table)->inpt_bindhashtbl[ \
117 (((laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \
118 (laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) + ntohs(lport)) & \
119 (table)->inpt_bindhash]
120 #define IN6PCBHASH_CONNECT(table, faddr, fport, laddr, lport) \
121 &(table)->inpt_bindhashtbl[ \
122 ((((faddr)->s6_addr32[0] ^ (faddr)->s6_addr32[1] ^ \
123 (faddr)->s6_addr32[2] ^ (faddr)->s6_addr32[3]) + ntohs(fport)) + \
124 (((laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \
125 (laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) + \
126 ntohs(lport))) & (table)->inpt_bindhash]
127
128 int ip6_anonportmin = IPV6PORT_ANONMIN;
129 int ip6_anonportmax = IPV6PORT_ANONMAX;
130 int ip6_lowportmin = IPV6PORT_RESERVEDMIN;
131 int ip6_lowportmax = IPV6PORT_RESERVEDMAX;
132
133 static struct pool in6pcb_pool;
134
135 static int
in6pcb_poolinit(void)136 in6pcb_poolinit(void)
137 {
138
139 pool_init(&in6pcb_pool, sizeof(struct in6pcb), 0, 0, 0, "in6pcbpl",
140 NULL, IPL_SOFTNET);
141 return 0;
142 }
143
144 void
in6_pcbinit(struct inpcbtable * table,int bindhashsize,int connecthashsize)145 in6_pcbinit(struct inpcbtable *table, int bindhashsize, int connecthashsize)
146 {
147 static ONCE_DECL(control);
148
149 in_pcbinit(table, bindhashsize, connecthashsize);
150 table->inpt_lastport = (u_int16_t)ip6_anonportmax;
151
152 RUN_ONCE(&control, in6pcb_poolinit);
153 }
154
155 int
in6_pcballoc(struct socket * so,void * v)156 in6_pcballoc(struct socket *so, void *v)
157 {
158 struct inpcbtable *table = v;
159 struct in6pcb *in6p;
160 int s;
161
162 s = splnet();
163 in6p = pool_get(&in6pcb_pool, PR_NOWAIT);
164 splx(s);
165 if (in6p == NULL)
166 return (ENOBUFS);
167 memset((void *)in6p, 0, sizeof(*in6p));
168 in6p->in6p_af = AF_INET6;
169 in6p->in6p_table = table;
170 in6p->in6p_socket = so;
171 in6p->in6p_hops = -1; /* use kernel default */
172 in6p->in6p_icmp6filt = NULL;
173 in6p->in6p_portalgo = PORTALGO_DEFAULT;
174 in6p->in6p_bindportonsend = false;
175 #if defined(IPSEC)
176 if (ipsec_enabled) {
177 int error = ipsec_init_pcbpolicy(so, &in6p->in6p_sp);
178 if (error != 0) {
179 s = splnet();
180 pool_put(&in6pcb_pool, in6p);
181 splx(s);
182 return error;
183 }
184 }
185 #endif /* IPSEC */
186 s = splnet();
187 TAILQ_INSERT_HEAD(&table->inpt_queue, (struct inpcb_hdr*)in6p,
188 inph_queue);
189 LIST_INSERT_HEAD(IN6PCBHASH_PORT(table, in6p->in6p_lport),
190 &in6p->in6p_head, inph_lhash);
191 in6_pcbstate(in6p, IN6P_ATTACHED);
192 splx(s);
193 if (ip6_v6only)
194 in6p->in6p_flags |= IN6P_IPV6_V6ONLY;
195 so->so_pcb = (void *)in6p;
196 return (0);
197 }
198
199 /*
200 * Bind address from sin6 to in6p.
201 */
202 static int
in6_pcbbind_addr(struct in6pcb * in6p,struct sockaddr_in6 * sin6,struct lwp * l)203 in6_pcbbind_addr(struct in6pcb *in6p, struct sockaddr_in6 *sin6, struct lwp *l)
204 {
205 int error;
206
207 /*
208 * We should check the family, but old programs
209 * incorrectly fail to intialize it.
210 */
211 if (sin6->sin6_family != AF_INET6)
212 return (EAFNOSUPPORT);
213
214 #ifndef INET
215 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
216 return (EADDRNOTAVAIL);
217 #endif
218
219 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
220 return (error);
221
222 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
223 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
224 return (EINVAL);
225 if (sin6->sin6_addr.s6_addr32[3]) {
226 struct sockaddr_in sin;
227
228 memset(&sin, 0, sizeof(sin));
229 sin.sin_len = sizeof(sin);
230 sin.sin_family = AF_INET;
231 bcopy(&sin6->sin6_addr.s6_addr32[3],
232 &sin.sin_addr, sizeof(sin.sin_addr));
233 if (!IN_MULTICAST(sin.sin_addr.s_addr) &&
234 ifa_ifwithaddr((struct sockaddr *)&sin) == NULL)
235 return EADDRNOTAVAIL;
236 }
237 } else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
238 // succeed
239 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
240 struct ifaddr *ia = NULL;
241
242 if ((in6p->in6p_flags & IN6P_FAITH) == 0 &&
243 (ia = ifa_ifwithaddr(sin6tosa(sin6))) == NULL)
244 return (EADDRNOTAVAIL);
245
246 /*
247 * bind to an anycast address might accidentally
248 * cause sending a packet with an anycast source
249 * address, so we forbid it.
250 *
251 * We should allow to bind to a deprecated address,
252 * since the application dare to use it.
253 * But, can we assume that they are careful enough
254 * to check if the address is deprecated or not?
255 * Maybe, as a safeguard, we should have a setsockopt
256 * flag to control the bind(2) behavior against
257 * deprecated addresses (default: forbid bind(2)).
258 */
259 if (ia &&
260 ifatoia6(ia)->ia6_flags &
261 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED))
262 return (EADDRNOTAVAIL);
263 }
264
265
266 in6p->in6p_laddr = sin6->sin6_addr;
267
268
269 return (0);
270 }
271
272 /*
273 * Bind port from sin6 to in6p.
274 */
275 static int
in6_pcbbind_port(struct in6pcb * in6p,struct sockaddr_in6 * sin6,struct lwp * l)276 in6_pcbbind_port(struct in6pcb *in6p, struct sockaddr_in6 *sin6, struct lwp *l)
277 {
278 struct inpcbtable *table = in6p->in6p_table;
279 struct socket *so = in6p->in6p_socket;
280 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
281 int error;
282
283 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
284 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
285 (so->so_options & SO_ACCEPTCONN) == 0))
286 wild = 1;
287
288 if (sin6->sin6_port != 0) {
289 enum kauth_network_req req;
290
291 #ifndef IPNOPRIVPORTS
292 if (ntohs(sin6->sin6_port) < IPV6PORT_RESERVED)
293 req = KAUTH_REQ_NETWORK_BIND_PRIVPORT;
294 else
295 #endif /* IPNOPRIVPORTS */
296 req = KAUTH_REQ_NETWORK_BIND_PORT;
297
298 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_BIND,
299 req, so, sin6, NULL);
300 if (error)
301 return (EACCES);
302 }
303
304 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
305 /*
306 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
307 * allow compepte duplication of binding if
308 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
309 * and a multicast address is bound on both
310 * new and duplicated sockets.
311 */
312 if (so->so_options & (SO_REUSEADDR | SO_REUSEPORT))
313 reuseport = SO_REUSEADDR|SO_REUSEPORT;
314 }
315
316 if (sin6->sin6_port != 0) {
317 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
318 #ifdef INET
319 struct inpcb *t;
320 struct vestigial_inpcb vestige;
321
322 t = in_pcblookup_port(table,
323 *(struct in_addr *)&sin6->sin6_addr.s6_addr32[3],
324 sin6->sin6_port, wild, &vestige);
325 if (t && (reuseport & t->inp_socket->so_options) == 0)
326 return (EADDRINUSE);
327 if (!t
328 && vestige.valid
329 && !(reuseport && vestige.reuse_port))
330 return EADDRINUSE;
331 #else
332 return (EADDRNOTAVAIL);
333 #endif
334 }
335
336 {
337 struct in6pcb *t;
338 struct vestigial_inpcb vestige;
339
340 t = in6_pcblookup_port(table, &sin6->sin6_addr,
341 sin6->sin6_port, wild, &vestige);
342 if (t && (reuseport & t->in6p_socket->so_options) == 0)
343 return (EADDRINUSE);
344 if (!t
345 && vestige.valid
346 && !(reuseport && vestige.reuse_port))
347 return EADDRINUSE;
348 }
349 }
350
351 if (sin6->sin6_port == 0) {
352 int e;
353 e = in6_pcbsetport(sin6, in6p, l);
354 if (e != 0)
355 return (e);
356 } else {
357 in6p->in6p_lport = sin6->sin6_port;
358 in6_pcbstate(in6p, IN6P_BOUND);
359 }
360
361 LIST_REMOVE(&in6p->in6p_head, inph_lhash);
362 LIST_INSERT_HEAD(IN6PCBHASH_PORT(table, in6p->in6p_lport),
363 &in6p->in6p_head, inph_lhash);
364
365 return (0);
366 }
367
368 int
in6_pcbbind(void * v,struct sockaddr_in6 * sin6,struct lwp * l)369 in6_pcbbind(void *v, struct sockaddr_in6 *sin6, struct lwp *l)
370 {
371 struct in6pcb *in6p = v;
372 struct sockaddr_in6 lsin6;
373 int error;
374
375 if (in6p->in6p_af != AF_INET6)
376 return (EINVAL);
377
378 /*
379 * If we already have a local port or a local address it means we're
380 * bounded.
381 */
382 if (in6p->in6p_lport || !(IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ||
383 (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) &&
384 in6p->in6p_laddr.s6_addr32[3] == 0)))
385 return (EINVAL);
386
387 if (NULL != sin6) {
388 /* We were provided a sockaddr_in6 to use. */
389 if (sin6->sin6_len != sizeof(*sin6))
390 return (EINVAL);
391 } else {
392 /* We always bind to *something*, even if it's "anything". */
393 lsin6 = *((const struct sockaddr_in6 *)
394 in6p->in6p_socket->so_proto->pr_domain->dom_sa_any);
395 sin6 = &lsin6;
396 }
397
398 /* Bind address. */
399 error = in6_pcbbind_addr(in6p, sin6, l);
400 if (error)
401 return (error);
402
403 /* Bind port. */
404 error = in6_pcbbind_port(in6p, sin6, l);
405 if (error) {
406 /*
407 * Reset the address here to "any" so we don't "leak" the
408 * in6pcb.
409 */
410 in6p->in6p_laddr = in6addr_any;
411
412 return (error);
413 }
414
415
416 #if 0
417 in6p->in6p_flowinfo = 0; /* XXX */
418 #endif
419 return (0);
420 }
421
422 /*
423 * Connect from a socket to a specified address.
424 * Both address and port must be specified in argument sin6.
425 * If don't have a local address for this socket yet,
426 * then pick one.
427 */
428 int
in6_pcbconnect(void * v,struct sockaddr_in6 * sin6,struct lwp * l)429 in6_pcbconnect(void *v, struct sockaddr_in6 *sin6, struct lwp *l)
430 {
431 struct in6pcb *in6p = v;
432 struct in6_addr *in6a = NULL;
433 struct ifnet *ifp = NULL; /* outgoing interface */
434 int error = 0;
435 int scope_ambiguous = 0;
436 #ifdef INET
437 struct in6_addr mapped;
438 #endif
439 struct sockaddr_in6 tmp;
440 struct vestigial_inpcb vestige;
441 struct psref psref;
442 int bound;
443
444 (void)&in6a; /* XXX fool gcc */
445
446 if (in6p->in6p_af != AF_INET6)
447 return (EINVAL);
448
449 if (sin6->sin6_len != sizeof(*sin6))
450 return (EINVAL);
451 if (sin6->sin6_family != AF_INET6)
452 return (EAFNOSUPPORT);
453 if (sin6->sin6_port == 0)
454 return (EADDRNOTAVAIL);
455
456 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
457 in6p->in6p_socket->so_type == SOCK_STREAM)
458 return EADDRNOTAVAIL;
459
460 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
461 scope_ambiguous = 1;
462 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
463 return(error);
464
465 /* sanity check for mapped address case */
466 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
467 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
468 return EINVAL;
469 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr))
470 in6p->in6p_laddr.s6_addr16[5] = htons(0xffff);
471 if (!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr))
472 return EINVAL;
473 } else
474 {
475 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr))
476 return EINVAL;
477 }
478
479 /* protect *sin6 from overwrites */
480 tmp = *sin6;
481 sin6 = &tmp;
482
483 bound = curlwp_bind();
484 /* Source address selection. */
485 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) &&
486 in6p->in6p_laddr.s6_addr32[3] == 0) {
487 #ifdef INET
488 struct sockaddr_in sin, *sinp;
489
490 memset(&sin, 0, sizeof(sin));
491 sin.sin_len = sizeof(sin);
492 sin.sin_family = AF_INET;
493 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr32[3],
494 sizeof(sin.sin_addr));
495 sinp = in_selectsrc(&sin, &in6p->in6p_route,
496 in6p->in6p_socket->so_options, NULL, &error);
497 if (sinp == NULL) {
498 if (error == 0)
499 error = EADDRNOTAVAIL;
500 return (error);
501 }
502 memset(&mapped, 0, sizeof(mapped));
503 mapped.s6_addr16[5] = htons(0xffff);
504 memcpy(&mapped.s6_addr32[3], &sinp->sin_addr, sizeof(sinp->sin_addr));
505 in6a = &mapped;
506 #else
507 return EADDRNOTAVAIL;
508 #endif
509 } else {
510 /*
511 * XXX: in6_selectsrc might replace the bound local address
512 * with the address specified by setsockopt(IPV6_PKTINFO).
513 * Is it the intended behavior?
514 */
515 in6a = in6_selectsrc(sin6, in6p->in6p_outputopts,
516 in6p->in6p_moptions,
517 &in6p->in6p_route,
518 &in6p->in6p_laddr, &ifp, &psref, &error);
519 if (ifp && scope_ambiguous &&
520 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
521 if_put(ifp, &psref);
522 curlwp_bindx(bound);
523 return(error);
524 }
525
526 if (in6a == NULL) {
527 if_put(ifp, &psref);
528 curlwp_bindx(bound);
529 if (error == 0)
530 error = EADDRNOTAVAIL;
531 return (error);
532 }
533 }
534
535 if (ifp != NULL) {
536 in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp);
537 if_put(ifp, &psref);
538 } else
539 in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim_rt(in6p);
540 curlwp_bindx(bound);
541
542 if (in6_pcblookup_connect(in6p->in6p_table, &sin6->sin6_addr,
543 sin6->sin6_port,
544 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ? in6a : &in6p->in6p_laddr,
545 in6p->in6p_lport, 0, &vestige)
546 || vestige.valid)
547 return (EADDRINUSE);
548 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ||
549 (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) &&
550 in6p->in6p_laddr.s6_addr32[3] == 0))
551 {
552 if (in6p->in6p_lport == 0) {
553 error = in6_pcbbind(in6p, NULL, l);
554 if (error != 0)
555 return error;
556 }
557 in6p->in6p_laddr = *in6a;
558 }
559 in6p->in6p_faddr = sin6->sin6_addr;
560 in6p->in6p_fport = sin6->sin6_port;
561
562 /* Late bind, if needed */
563 if (in6p->in6p_bindportonsend) {
564 struct sockaddr_in6 lsin = *((const struct sockaddr_in6 *)
565 in6p->in6p_socket->so_proto->pr_domain->dom_sa_any);
566 lsin.sin6_addr = in6p->in6p_laddr;
567 lsin.sin6_port = 0;
568
569 if ((error = in6_pcbbind_port(in6p, &lsin, l)) != 0)
570 return error;
571 }
572
573 in6_pcbstate(in6p, IN6P_CONNECTED);
574 in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
575 if (ip6_auto_flowlabel)
576 in6p->in6p_flowinfo |=
577 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
578 #if defined(IPSEC)
579 if (ipsec_enabled && in6p->in6p_socket->so_type == SOCK_STREAM)
580 ipsec_pcbconn(in6p->in6p_sp);
581 #endif
582 return (0);
583 }
584
585 void
in6_pcbdisconnect(struct in6pcb * in6p)586 in6_pcbdisconnect(struct in6pcb *in6p)
587 {
588 memset((void *)&in6p->in6p_faddr, 0, sizeof(in6p->in6p_faddr));
589 in6p->in6p_fport = 0;
590 in6_pcbstate(in6p, IN6P_BOUND);
591 in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
592 #if defined(IPSEC)
593 if (ipsec_enabled)
594 ipsec_pcbdisconn(in6p->in6p_sp);
595 #endif
596 if (in6p->in6p_socket->so_state & SS_NOFDREF)
597 in6_pcbdetach(in6p);
598 }
599
600 void
in6_pcbdetach(struct in6pcb * in6p)601 in6_pcbdetach(struct in6pcb *in6p)
602 {
603 struct socket *so = in6p->in6p_socket;
604 int s;
605
606 if (in6p->in6p_af != AF_INET6)
607 return;
608
609 #if defined(IPSEC)
610 if (ipsec_enabled)
611 ipsec6_delete_pcbpolicy(in6p);
612 #endif
613 so->so_pcb = NULL;
614
615 s = splnet();
616 in6_pcbstate(in6p, IN6P_ATTACHED);
617 LIST_REMOVE(&in6p->in6p_head, inph_lhash);
618 TAILQ_REMOVE(&in6p->in6p_table->inpt_queue, &in6p->in6p_head,
619 inph_queue);
620 splx(s);
621
622 if (in6p->in6p_options) {
623 m_freem(in6p->in6p_options);
624 }
625 if (in6p->in6p_outputopts != NULL) {
626 ip6_clearpktopts(in6p->in6p_outputopts, -1);
627 free(in6p->in6p_outputopts, M_IP6OPT);
628 }
629 rtcache_free(&in6p->in6p_route);
630 ip6_freemoptions(in6p->in6p_moptions);
631 ip_freemoptions(in6p->in6p_v4moptions);
632 sofree(so); /* drops the socket's lock */
633
634 pool_put(&in6pcb_pool, in6p);
635 mutex_enter(softnet_lock); /* reacquire it */
636 }
637
638 void
in6_setsockaddr(struct in6pcb * in6p,struct sockaddr_in6 * sin6)639 in6_setsockaddr(struct in6pcb *in6p, struct sockaddr_in6 *sin6)
640 {
641
642 if (in6p->in6p_af != AF_INET6)
643 return;
644
645 sockaddr_in6_init(sin6, &in6p->in6p_laddr, in6p->in6p_lport, 0, 0);
646 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
647 }
648
649 void
in6_setpeeraddr(struct in6pcb * in6p,struct sockaddr_in6 * sin6)650 in6_setpeeraddr(struct in6pcb *in6p, struct sockaddr_in6 *sin6)
651 {
652
653 if (in6p->in6p_af != AF_INET6)
654 return;
655
656 sockaddr_in6_init(sin6, &in6p->in6p_faddr, in6p->in6p_fport, 0, 0);
657 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
658 }
659
660 /*
661 * Pass some notification to all connections of a protocol
662 * associated with address dst. The local address and/or port numbers
663 * may be specified to limit the search. The "usual action" will be
664 * taken, depending on the ctlinput cmd. The caller must filter any
665 * cmds that are uninteresting (e.g., no error in the map).
666 * Call the protocol specific routine (if any) to report
667 * any errors for each matching socket.
668 *
669 * Must be called at splsoftnet.
670 *
671 * Note: src (4th arg) carries the flowlabel value on the original IPv6
672 * header, in sin6_flowinfo member.
673 */
674 int
in6_pcbnotify(struct inpcbtable * table,const struct sockaddr * dst,u_int fport_arg,const struct sockaddr * src,u_int lport_arg,int cmd,void * cmdarg,void (* notify)(struct in6pcb *,int))675 in6_pcbnotify(struct inpcbtable *table, const struct sockaddr *dst,
676 u_int fport_arg, const struct sockaddr *src, u_int lport_arg, int cmd,
677 void *cmdarg, void (*notify)(struct in6pcb *, int))
678 {
679 struct rtentry *rt;
680 struct inpcb_hdr *inph, *ninph;
681 struct sockaddr_in6 sa6_src;
682 const struct sockaddr_in6 *sa6_dst;
683 u_int16_t fport = fport_arg, lport = lport_arg;
684 int errno;
685 int nmatch = 0;
686 u_int32_t flowinfo;
687
688 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
689 return 0;
690
691 sa6_dst = (const struct sockaddr_in6 *)dst;
692 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
693 return 0;
694
695 /*
696 * note that src can be NULL when we get notify by local fragmentation.
697 */
698 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
699 flowinfo = sa6_src.sin6_flowinfo;
700
701 /*
702 * Redirects go to all references to the destination,
703 * and use in6_rtchange to invalidate the route cache.
704 * Dead host indications: also use in6_rtchange to invalidate
705 * the cache, and deliver the error to all the sockets.
706 * Otherwise, if we have knowledge of the local port and address,
707 * deliver only to that socket.
708 */
709 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
710 fport = 0;
711 lport = 0;
712 memset((void *)&sa6_src.sin6_addr, 0, sizeof(sa6_src.sin6_addr));
713
714 if (cmd != PRC_HOSTDEAD)
715 notify = in6_rtchange;
716 }
717
718 errno = inet6ctlerrmap[cmd];
719 TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) {
720 struct in6pcb *in6p = (struct in6pcb *)inph;
721 if (in6p->in6p_af != AF_INET6)
722 continue;
723
724 /*
725 * Under the following condition, notify of redirects
726 * to the pcb, without making address matches against inpcb.
727 * - redirect notification is arrived.
728 * - the inpcb is unconnected.
729 * - the inpcb is caching !RTF_HOST routing entry.
730 * - the ICMPv6 notification is from the gateway cached in the
731 * inpcb. i.e. ICMPv6 notification is from nexthop gateway
732 * the inpcb used very recently.
733 *
734 * This is to improve interaction between netbsd/openbsd
735 * redirect handling code, and inpcb route cache code.
736 * without the clause, !RTF_HOST routing entry (which carries
737 * gateway used by inpcb right before the ICMPv6 redirect)
738 * will be cached forever in unconnected inpcb.
739 *
740 * There still is a question regarding to what is TRT:
741 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be
742 * generated on packet output. inpcb will always cache
743 * RTF_HOST routing entry so there's no need for the clause
744 * (ICMPv6 redirect will update RTF_HOST routing entry,
745 * and inpcb is caching it already).
746 * However, bsdi/freebsd are vulnerable to local DoS attacks
747 * due to the cloned routing entries.
748 * - Specwise, "destination cache" is mentioned in RFC2461.
749 * Jinmei says that it implies bsdi/freebsd behavior, itojun
750 * is not really convinced.
751 * - Having hiwat/lowat on # of cloned host route (redirect/
752 * pmtud) may be a good idea. netbsd/openbsd has it. see
753 * icmp6_mtudisc_update().
754 */
755 if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) &&
756 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
757 (rt = rtcache_validate(&in6p->in6p_route)) != NULL &&
758 !(rt->rt_flags & RTF_HOST)) {
759 const struct sockaddr_in6 *dst6;
760
761 dst6 = (const struct sockaddr_in6 *)
762 rtcache_getdst(&in6p->in6p_route);
763 if (dst6 == NULL)
764 ;
765 else if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr,
766 &sa6_dst->sin6_addr))
767 goto do_notify;
768 }
769
770 /*
771 * If the error designates a new path MTU for a destination
772 * and the application (associated with this socket) wanted to
773 * know the value, notify. Note that we notify for all
774 * disconnected sockets if the corresponding application
775 * wanted. This is because some UDP applications keep sending
776 * sockets disconnected.
777 * XXX: should we avoid to notify the value to TCP sockets?
778 */
779 if (cmd == PRC_MSGSIZE && (in6p->in6p_flags & IN6P_MTU) != 0 &&
780 (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) ||
781 IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &sa6_dst->sin6_addr))) {
782 ip6_notify_pmtu(in6p, (const struct sockaddr_in6 *)dst,
783 (u_int32_t *)cmdarg);
784 }
785
786 /*
787 * Detect if we should notify the error. If no source and
788 * destination ports are specified, but non-zero flowinfo and
789 * local address match, notify the error. This is the case
790 * when the error is delivered with an encrypted buffer
791 * by ESP. Otherwise, just compare addresses and ports
792 * as usual.
793 */
794 if (lport == 0 && fport == 0 && flowinfo &&
795 in6p->in6p_socket != NULL &&
796 flowinfo == (in6p->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
797 IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &sa6_src.sin6_addr))
798 goto do_notify;
799 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
800 &sa6_dst->sin6_addr) ||
801 in6p->in6p_socket == NULL ||
802 (lport && in6p->in6p_lport != lport) ||
803 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
804 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
805 &sa6_src.sin6_addr)) ||
806 (fport && in6p->in6p_fport != fport))
807 continue;
808
809 do_notify:
810 if (notify)
811 (*notify)(in6p, errno);
812 nmatch++;
813 }
814 return nmatch;
815 }
816
817 void
in6_pcbpurgeif0(struct inpcbtable * table,struct ifnet * ifp)818 in6_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp)
819 {
820 struct inpcb_hdr *inph, *ninph;
821 struct ip6_moptions *im6o;
822 struct in6_multi_mship *imm, *nimm;
823
824 KASSERT(ifp != NULL);
825
826 TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) {
827 struct in6pcb *in6p = (struct in6pcb *)inph;
828 if (in6p->in6p_af != AF_INET6)
829 continue;
830
831 im6o = in6p->in6p_moptions;
832 if (im6o) {
833 /*
834 * Unselect the outgoing interface if it is being
835 * detached.
836 */
837 if (im6o->im6o_multicast_if_index == ifp->if_index)
838 im6o->im6o_multicast_if_index = 0;
839
840 /*
841 * Drop multicast group membership if we joined
842 * through the interface being detached.
843 * XXX controversial - is it really legal for kernel
844 * to force this?
845 */
846 for (imm = im6o->im6o_memberships.lh_first;
847 imm != NULL; imm = nimm) {
848 nimm = imm->i6mm_chain.le_next;
849 if (imm->i6mm_maddr->in6m_ifp == ifp) {
850 LIST_REMOVE(imm, i6mm_chain);
851 in6_leavegroup(imm);
852 }
853 }
854 }
855 in_purgeifmcast(in6p->in6p_v4moptions, ifp);
856 }
857 }
858
859 void
in6_pcbpurgeif(struct inpcbtable * table,struct ifnet * ifp)860 in6_pcbpurgeif(struct inpcbtable *table, struct ifnet *ifp)
861 {
862 struct rtentry *rt;
863 struct inpcb_hdr *inph, *ninph;
864
865 TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) {
866 struct in6pcb *in6p = (struct in6pcb *)inph;
867 if (in6p->in6p_af != AF_INET6)
868 continue;
869 if ((rt = rtcache_validate(&in6p->in6p_route)) != NULL &&
870 rt->rt_ifp == ifp)
871 in6_rtchange(in6p, 0);
872 }
873 }
874
875 /*
876 * Check for alternatives when higher level complains
877 * about service problems. For now, invalidate cached
878 * routing information. If the route was created dynamically
879 * (by a redirect), time to try a default gateway again.
880 */
881 void
in6_losing(struct in6pcb * in6p)882 in6_losing(struct in6pcb *in6p)
883 {
884 struct rtentry *rt;
885 struct rt_addrinfo info;
886
887 if (in6p->in6p_af != AF_INET6)
888 return;
889
890 if ((rt = rtcache_validate(&in6p->in6p_route)) == NULL)
891 return;
892
893 memset(&info, 0, sizeof(info));
894 info.rti_info[RTAX_DST] = rtcache_getdst(&in6p->in6p_route);
895 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
896 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
897 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
898 if (rt->rt_flags & RTF_DYNAMIC) {
899 (void)rtrequest(RTM_DELETE, rt_getkey(rt),
900 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL);
901 }
902 /*
903 * A new route can be allocated
904 * the next time output is attempted.
905 */
906 rtcache_free(&in6p->in6p_route);
907 }
908
909 /*
910 * After a routing change, flush old routing. A new route can be
911 * allocated the next time output is attempted.
912 */
913 void
in6_rtchange(struct in6pcb * in6p,int errno)914 in6_rtchange(struct in6pcb *in6p, int errno)
915 {
916 if (in6p->in6p_af != AF_INET6)
917 return;
918
919 rtcache_free(&in6p->in6p_route);
920 /*
921 * A new route can be allocated the next time
922 * output is attempted.
923 */
924 }
925
926 struct in6pcb *
in6_pcblookup_port(struct inpcbtable * table,struct in6_addr * laddr6,u_int lport_arg,int lookup_wildcard,struct vestigial_inpcb * vp)927 in6_pcblookup_port(struct inpcbtable *table, struct in6_addr *laddr6,
928 u_int lport_arg, int lookup_wildcard, struct vestigial_inpcb *vp)
929 {
930 struct inpcbhead *head;
931 struct inpcb_hdr *inph;
932 struct in6pcb *in6p, *match = NULL;
933 int matchwild = 3, wildcard;
934 u_int16_t lport = lport_arg;
935
936 if (vp)
937 vp->valid = 0;
938
939 head = IN6PCBHASH_PORT(table, lport);
940 LIST_FOREACH(inph, head, inph_lhash) {
941 in6p = (struct in6pcb *)inph;
942 if (in6p->in6p_af != AF_INET6)
943 continue;
944
945 if (in6p->in6p_lport != lport)
946 continue;
947 wildcard = 0;
948 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
949 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
950 continue;
951 }
952 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr))
953 wildcard++;
954 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) {
955 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
956 continue;
957 if (!IN6_IS_ADDR_V4MAPPED(laddr6))
958 continue;
959
960 /* duplicate of IPv4 logic */
961 wildcard = 0;
962 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr) &&
963 in6p->in6p_faddr.s6_addr32[3])
964 wildcard++;
965 if (!in6p->in6p_laddr.s6_addr32[3]) {
966 if (laddr6->s6_addr32[3])
967 wildcard++;
968 } else {
969 if (!laddr6->s6_addr32[3])
970 wildcard++;
971 else {
972 if (in6p->in6p_laddr.s6_addr32[3] !=
973 laddr6->s6_addr32[3])
974 continue;
975 }
976 }
977 } else if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
978 if (IN6_IS_ADDR_V4MAPPED(laddr6)) {
979 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
980 continue;
981 }
982 if (!IN6_IS_ADDR_UNSPECIFIED(laddr6))
983 wildcard++;
984 } else {
985 if (IN6_IS_ADDR_V4MAPPED(laddr6)) {
986 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
987 continue;
988 }
989 if (IN6_IS_ADDR_UNSPECIFIED(laddr6))
990 wildcard++;
991 else {
992 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
993 laddr6))
994 continue;
995 }
996 }
997 if (wildcard && !lookup_wildcard)
998 continue;
999 if (wildcard < matchwild) {
1000 match = in6p;
1001 matchwild = wildcard;
1002 if (matchwild == 0)
1003 break;
1004 }
1005 }
1006 if (match && matchwild == 0)
1007 return match;
1008
1009 if (vp && table->vestige && table->vestige->init_ports6) {
1010 struct vestigial_inpcb better;
1011 void *state;
1012
1013 state = (*table->vestige->init_ports6)(laddr6,
1014 lport_arg,
1015 lookup_wildcard);
1016 while (table->vestige
1017 && (*table->vestige->next_port6)(state, vp)) {
1018
1019 if (vp->lport != lport)
1020 continue;
1021 wildcard = 0;
1022 if (!IN6_IS_ADDR_UNSPECIFIED(&vp->faddr.v6))
1023 wildcard++;
1024 if (IN6_IS_ADDR_UNSPECIFIED(&vp->laddr.v6)) {
1025 if (!IN6_IS_ADDR_UNSPECIFIED(laddr6))
1026 wildcard++;
1027 } else {
1028 if (IN6_IS_ADDR_V4MAPPED(laddr6)) {
1029 if (vp->v6only)
1030 continue;
1031 }
1032 if (IN6_IS_ADDR_UNSPECIFIED(laddr6))
1033 wildcard++;
1034 else {
1035 if (!IN6_ARE_ADDR_EQUAL(&vp->laddr.v6, laddr6))
1036 continue;
1037 }
1038 }
1039 if (wildcard && !lookup_wildcard)
1040 continue;
1041 if (wildcard < matchwild) {
1042 better = *vp;
1043 match = (void*)&better;
1044
1045 matchwild = wildcard;
1046 if (matchwild == 0)
1047 break;
1048 }
1049 }
1050
1051 if (match) {
1052 if (match != (void*)&better)
1053 return match;
1054 else {
1055 *vp = better;
1056 return 0;
1057 }
1058 }
1059 }
1060 return (match);
1061 }
1062
1063 /*
1064 * WARNING: return value (rtentry) could be IPv4 one if in6pcb is connected to
1065 * IPv4 mapped address.
1066 */
1067 struct rtentry *
in6_pcbrtentry(struct in6pcb * in6p)1068 in6_pcbrtentry(struct in6pcb *in6p)
1069 {
1070 struct rtentry *rt;
1071 struct route *ro;
1072 union {
1073 const struct sockaddr *sa;
1074 const struct sockaddr_in6 *sa6;
1075 #ifdef INET
1076 const struct sockaddr_in *sa4;
1077 #endif
1078 } cdst;
1079
1080 ro = &in6p->in6p_route;
1081
1082 if (in6p->in6p_af != AF_INET6)
1083 return (NULL);
1084
1085 cdst.sa = rtcache_getdst(ro);
1086 if (cdst.sa == NULL)
1087 ;
1088 #ifdef INET
1089 else if (cdst.sa->sa_family == AF_INET) {
1090 KASSERT(IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr));
1091 if (cdst.sa4->sin_addr.s_addr != in6p->in6p_faddr.s6_addr32[3])
1092 rtcache_free(ro);
1093 }
1094 #endif
1095 else {
1096 if (!IN6_ARE_ADDR_EQUAL(&cdst.sa6->sin6_addr,
1097 &in6p->in6p_faddr))
1098 rtcache_free(ro);
1099 }
1100 if ((rt = rtcache_validate(ro)) == NULL)
1101 rt = rtcache_update(ro, 1);
1102 #ifdef INET
1103 if (rt == NULL && IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
1104 union {
1105 struct sockaddr dst;
1106 struct sockaddr_in dst4;
1107 } u;
1108 struct in_addr addr;
1109
1110 addr.s_addr = in6p->in6p_faddr.s6_addr32[3];
1111
1112 sockaddr_in_init(&u.dst4, &addr, 0);
1113 if (rtcache_setdst(ro, &u.dst) != 0)
1114 return NULL;
1115
1116 rt = rtcache_init(ro);
1117 } else
1118 #endif
1119 if (rt == NULL && !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1120 union {
1121 struct sockaddr dst;
1122 struct sockaddr_in6 dst6;
1123 } u;
1124
1125 sockaddr_in6_init(&u.dst6, &in6p->in6p_faddr, 0, 0, 0);
1126 if (rtcache_setdst(ro, &u.dst) != 0)
1127 return NULL;
1128
1129 rt = rtcache_init(ro);
1130 }
1131 return rt;
1132 }
1133
1134 struct in6pcb *
in6_pcblookup_connect(struct inpcbtable * table,const struct in6_addr * faddr6,u_int fport_arg,const struct in6_addr * laddr6,u_int lport_arg,int faith,struct vestigial_inpcb * vp)1135 in6_pcblookup_connect(struct inpcbtable *table, const struct in6_addr *faddr6,
1136 u_int fport_arg, const struct in6_addr *laddr6, u_int lport_arg,
1137 int faith,
1138 struct vestigial_inpcb *vp)
1139 {
1140 struct inpcbhead *head;
1141 struct inpcb_hdr *inph;
1142 struct in6pcb *in6p;
1143 u_int16_t fport = fport_arg, lport = lport_arg;
1144
1145 if (vp)
1146 vp->valid = 0;
1147
1148 head = IN6PCBHASH_CONNECT(table, faddr6, fport, laddr6, lport);
1149 LIST_FOREACH(inph, head, inph_hash) {
1150 in6p = (struct in6pcb *)inph;
1151 if (in6p->in6p_af != AF_INET6)
1152 continue;
1153
1154 /* find exact match on both source and dest */
1155 if (in6p->in6p_fport != fport)
1156 continue;
1157 if (in6p->in6p_lport != lport)
1158 continue;
1159 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr))
1160 continue;
1161 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6))
1162 continue;
1163 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr))
1164 continue;
1165 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6))
1166 continue;
1167 if ((IN6_IS_ADDR_V4MAPPED(laddr6) ||
1168 IN6_IS_ADDR_V4MAPPED(faddr6)) &&
1169 (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1170 continue;
1171 return in6p;
1172 }
1173 if (vp && table->vestige) {
1174 if ((*table->vestige->lookup6)(faddr6, fport_arg,
1175 laddr6, lport_arg, vp))
1176 return NULL;
1177 }
1178
1179 return NULL;
1180 }
1181
1182 struct in6pcb *
in6_pcblookup_bind(struct inpcbtable * table,const struct in6_addr * laddr6,u_int lport_arg,int faith)1183 in6_pcblookup_bind(struct inpcbtable *table, const struct in6_addr *laddr6,
1184 u_int lport_arg, int faith)
1185 {
1186 struct inpcbhead *head;
1187 struct inpcb_hdr *inph;
1188 struct in6pcb *in6p;
1189 u_int16_t lport = lport_arg;
1190 #ifdef INET
1191 struct in6_addr zero_mapped;
1192 #endif
1193
1194 head = IN6PCBHASH_BIND(table, laddr6, lport);
1195 LIST_FOREACH(inph, head, inph_hash) {
1196 in6p = (struct in6pcb *)inph;
1197 if (in6p->in6p_af != AF_INET6)
1198 continue;
1199
1200 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0)
1201 continue;
1202 if (in6p->in6p_fport != 0)
1203 continue;
1204 if (in6p->in6p_lport != lport)
1205 continue;
1206 if (IN6_IS_ADDR_V4MAPPED(laddr6) &&
1207 (in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
1208 continue;
1209 if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6))
1210 goto out;
1211 }
1212 #ifdef INET
1213 if (IN6_IS_ADDR_V4MAPPED(laddr6)) {
1214 memset(&zero_mapped, 0, sizeof(zero_mapped));
1215 zero_mapped.s6_addr16[5] = 0xffff;
1216 head = IN6PCBHASH_BIND(table, &zero_mapped, lport);
1217 LIST_FOREACH(inph, head, inph_hash) {
1218 in6p = (struct in6pcb *)inph;
1219 if (in6p->in6p_af != AF_INET6)
1220 continue;
1221
1222 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0)
1223 continue;
1224 if (in6p->in6p_fport != 0)
1225 continue;
1226 if (in6p->in6p_lport != lport)
1227 continue;
1228 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
1229 continue;
1230 if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &zero_mapped))
1231 goto out;
1232 }
1233 }
1234 #endif
1235 head = IN6PCBHASH_BIND(table, &zeroin6_addr, lport);
1236 LIST_FOREACH(inph, head, inph_hash) {
1237 in6p = (struct in6pcb *)inph;
1238 if (in6p->in6p_af != AF_INET6)
1239 continue;
1240
1241 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0)
1242 continue;
1243 if (in6p->in6p_fport != 0)
1244 continue;
1245 if (in6p->in6p_lport != lport)
1246 continue;
1247 if (IN6_IS_ADDR_V4MAPPED(laddr6) &&
1248 (in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
1249 continue;
1250 if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &zeroin6_addr))
1251 goto out;
1252 }
1253 return (NULL);
1254
1255 out:
1256 inph = &in6p->in6p_head;
1257 if (inph != LIST_FIRST(head)) {
1258 LIST_REMOVE(inph, inph_hash);
1259 LIST_INSERT_HEAD(head, inph, inph_hash);
1260 }
1261 return in6p;
1262 }
1263
1264 void
in6_pcbstate(struct in6pcb * in6p,int state)1265 in6_pcbstate(struct in6pcb *in6p, int state)
1266 {
1267
1268 if (in6p->in6p_af != AF_INET6)
1269 return;
1270
1271 if (in6p->in6p_state > IN6P_ATTACHED)
1272 LIST_REMOVE(&in6p->in6p_head, inph_hash);
1273
1274 switch (state) {
1275 case IN6P_BOUND:
1276 LIST_INSERT_HEAD(IN6PCBHASH_BIND(in6p->in6p_table,
1277 &in6p->in6p_laddr, in6p->in6p_lport), &in6p->in6p_head,
1278 inph_hash);
1279 break;
1280 case IN6P_CONNECTED:
1281 LIST_INSERT_HEAD(IN6PCBHASH_CONNECT(in6p->in6p_table,
1282 &in6p->in6p_faddr, in6p->in6p_fport,
1283 &in6p->in6p_laddr, in6p->in6p_lport), &in6p->in6p_head,
1284 inph_hash);
1285 break;
1286 }
1287
1288 in6p->in6p_state = state;
1289 }
1290