37803316caf0db72a85bf945e1dd29c9de2eed3a
[dragonfly.git] / sys / netinet6 / in6_pcb.c
1 /*      $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam 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  * 3. 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/priv.h>
82 #include <sys/jail.h>
83
84 #include <sys/thread2.h>
85 #include <sys/msgport2.h>
86
87 #include <vm/vm_zone.h>
88
89 #include <net/if.h>
90 #include <net/if_types.h>
91 #include <net/route.h>
92
93 #include <netinet/in.h>
94 #include <netinet/in_var.h>
95 #include <netinet/in_systm.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
103 #ifdef IPSEC
104 #include <netinet6/ipsec.h>
105 #ifdef INET6
106 #include <netinet6/ipsec6.h>
107 #endif
108 #include <netinet6/ah.h>
109 #ifdef INET6
110 #include <netinet6/ah6.h>
111 #endif
112 #include <netproto/key/key.h>
113 #endif /* IPSEC */
114
115 #ifdef FAST_IPSEC
116 #include <netproto/ipsec/ipsec.h>
117 #include <netproto/ipsec/ipsec6.h>
118 #include <netproto/ipsec/key.h>
119 #define IPSEC
120 #endif /* FAST_IPSEC */
121
122 struct  in6_addr zeroin6_addr;
123
124 int
125 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
126 {
127         struct socket *so = inp->inp_socket;
128         struct sockaddr_in6 *sin6 = NULL;
129         struct sockaddr_in6 jsin6;
130         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
131         struct proc *p = td->td_proc;
132         struct ucred *cred = NULL;
133         u_short lport = 0;
134         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
135         int error;
136
137         if (!in6_ifaddr) /* XXX broken! */
138                 return (EADDRNOTAVAIL);
139         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
140                 return (EINVAL);
141         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
142                 wild = 1;
143         if (p)
144                 cred = p->p_ucred;
145
146         /*
147          * This has to be atomic.  If the porthash is shared across multiple
148          * protocol threads (aka tcp) then the token will be non-NULL.
149          */
150         if (pcbinfo->porttoken)
151                 lwkt_gettoken(pcbinfo->porttoken);
152
153         if (nam) {
154                 sin6 = (struct sockaddr_in6 *)nam;
155                 if (nam->sa_len != sizeof(*sin6)) {
156                         error = EINVAL;
157                         goto done;
158                 }
159                 /*
160                  * family check.
161                  */
162                 if (nam->sa_family != AF_INET6) {
163                         error = EAFNOSUPPORT;
164                         goto done;
165                 }
166
167                 if (!prison_replace_wildcards(td, nam)) {
168                         error = EINVAL;
169                         goto done;
170                 }
171
172                 /* KAME hack: embed scopeid */
173                 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) {
174                         error = EINVAL;
175                         goto done;
176                 }
177                 /* this must be cleared for ifa_ifwithaddr() */
178                 sin6->sin6_scope_id = 0;
179
180                 lport = sin6->sin6_port;
181                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
182                         /*
183                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
184                          * allow compepte duplication of binding if
185                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
186                          * and a multicast address is bound on both
187                          * new and duplicated sockets.
188                          */
189                         if (so->so_options & SO_REUSEADDR)
190                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
191                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
192                         struct ifaddr *ia = NULL;
193
194                         sin6->sin6_port = 0;            /* yech... */
195                         if (!prison_replace_wildcards(td, (struct sockaddr *)sin6)) {
196                                 sin6->sin6_addr = kin6addr_any;
197                                 error = EINVAL;
198                                 goto done;
199                         }
200                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == NULL) {
201                                 error = EADDRNOTAVAIL;
202                                 goto done;
203                         }
204
205                         /*
206                          * XXX: bind to an anycast address might accidentally
207                          * cause sending a packet with anycast source address.
208                          * We should allow to bind to a deprecated address, since
209                          * the application dare to use it.
210                          */
211                         if (ia &&
212                             ((struct in6_ifaddr *)ia)->ia6_flags &
213                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
214                                 error = EADDRNOTAVAIL;
215                                 goto done;
216                         }
217                 }
218                 if (lport) {
219                         struct inpcb *t;
220
221                         /* GROSS */
222                         if (ntohs(lport) < IPV6PORT_RESERVED && cred &&
223                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0)) {
224                                 error = EACCES;
225                                 goto done;
226                         }
227                         if (so->so_cred->cr_uid != 0 &&
228                             !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
229                                 t = in6_pcblookup_local(pcbinfo,
230                                     &sin6->sin6_addr, lport,
231                                     INPLOOKUP_WILDCARD, cred);
232                                 if (t &&
233                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
234                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
235                                      (t->inp_socket->so_options &
236                                       SO_REUSEPORT) == 0) &&
237                                     (so->so_cred->cr_uid !=
238                                      t->inp_socket->so_cred->cr_uid)) {
239                                         error = EADDRINUSE;
240                                         goto done;
241                                 }
242                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
243                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
244                                         struct sockaddr_in sin;
245
246                                         in6_sin6_2_sin(&sin, sin6);
247                                         t = in_pcblookup_local(pcbinfo,
248                                                 sin.sin_addr, lport,
249                                                 INPLOOKUP_WILDCARD, cred);
250                                         if (t &&
251                                             (so->so_cred->cr_uid !=
252                                              t->inp_socket->so_cred->cr_uid) &&
253                                             (ntohl(t->inp_laddr.s_addr) !=
254                                              INADDR_ANY ||
255                                              INP_SOCKAF(so) ==
256                                              INP_SOCKAF(t->inp_socket))) {
257                                                 error = EADDRINUSE;
258                                                 goto done;
259                                         }
260                                 }
261                         }
262                         if (cred && cred->cr_prison &&
263                             !prison_replace_wildcards(td, nam)) {
264                                 error = EADDRNOTAVAIL;
265                                 goto done;
266                         }
267                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
268                                                 lport, wild, cred);
269                         if (t && (reuseport & t->inp_socket->so_options) == 0) {
270                                 error = EADDRINUSE;
271                                 goto done;
272                         }
273                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
274                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
275                                 struct sockaddr_in sin;
276
277                                 in6_sin6_2_sin(&sin, sin6);
278                                 t = in_pcblookup_local(pcbinfo,
279                                                        sin.sin_addr, lport,
280                                                        wild, cred);
281                                 if (t &&
282                                     (reuseport & t->inp_socket->so_options)
283                                     == 0 &&
284                                     (ntohl(t->inp_laddr.s_addr)
285                                      != INADDR_ANY ||
286                                      INP_SOCKAF(so) ==
287                                      INP_SOCKAF(t->inp_socket))) {
288                                         error = EADDRINUSE;
289                                         goto done;
290                                 }
291                         }
292                 }
293                 inp->in6p_laddr = sin6->sin6_addr;
294         }
295         if (lport == 0) {
296                 int e;
297
298                 jsin6.sin6_addr = inp->in6p_laddr;
299                 jsin6.sin6_family = AF_INET6;
300                 if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin6)) {
301                         inp->in6p_laddr = kin6addr_any;
302                         inp->inp_lport = 0;
303                         error = EINVAL;
304                         goto done;
305                 }
306
307                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0) {
308                         error = e;
309                         goto done;
310                 }
311         }
312         else {
313                 inp->inp_lport = lport;
314                 in_pcbinsporthash(inp);
315         }
316         error = 0;
317 done:
318         if (pcbinfo->porttoken)
319                 lwkt_reltoken(pcbinfo->porttoken);
320         return error;
321 }
322
323 /*
324  *   Transform old in6_pcbconnect() into an inner subroutine for new
325  *   in6_pcbconnect(): Do some validity-checking on the remote
326  *   address (in mbuf 'nam') and then determine local host address
327  *   (i.e., which interface) to use to access that remote host.
328  *
329  *   This preserves definition of in6_pcbconnect(), while supporting a
330  *   slightly different version for T/TCP.  (This is more than
331  *   a bit of a kludge, but cleaning up the internal interfaces would
332  *   have forced minor changes in every protocol).
333  */
334
335 int
336 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
337              struct in6_addr **plocal_addr6, struct thread *td)
338 {
339         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
340         struct ifnet *ifp = NULL;
341         int error = 0;
342
343         if (nam->sa_len != sizeof (*sin6))
344                 return (EINVAL);
345         if (sin6->sin6_family != AF_INET6)
346                 return (EAFNOSUPPORT);
347         if (sin6->sin6_port == 0)
348                 return (EADDRNOTAVAIL);
349
350         /* KAME hack: embed scopeid */
351         if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
352                 return EINVAL;
353
354         if (in6_ifaddr) {
355                 /*
356                  * If the destination address is UNSPECIFIED addr,
357                  * use the loopback addr, e.g ::1.
358                  */
359                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
360                         sin6->sin6_addr = kin6addr_loopback;
361         }
362         {
363                 /*
364                  * XXX: in6_selectsrc might replace the bound local address
365                  * with the address specified by setsockopt(IPV6_PKTINFO).
366                  * Is it the intended behavior?
367                  */
368                 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
369                                               inp->in6p_moptions,
370                                               &inp->in6p_route,
371                                               &inp->in6p_laddr, &error, td);
372                 if (*plocal_addr6 == NULL) {
373                         if (error == 0)
374                                 error = EADDRNOTAVAIL;
375                         return (error);
376                 }
377                 /*
378                  * Don't do pcblookup call here; return interface in
379                  * plocal_addr6
380                  * and exit to caller, that will do the lookup.
381                  */
382         }
383
384         if (inp->in6p_route.ro_rt)
385                 ifp = inp->in6p_route.ro_rt->rt_ifp;
386
387         return (0);
388 }
389
390 /*
391  * Outer subroutine:
392  * Connect from a socket to a specified address.
393  * Both address and port must be specified in argument sin.
394  * If don't have a local address for this socket yet,
395  * then pick one.
396  */
397 int
398 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
399 {
400         struct in6_addr *addr6;
401         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
402         int error;
403
404         /*
405          * Call inner routine, to assign local interface address.
406          * in6_pcbladdr() may automatically fill in sin6_scope_id.
407          */
408         if ((error = in6_pcbladdr(inp, nam, &addr6, td)) != 0)
409                 return (error);
410
411         if (in6_pcblookup_hash(inp->inp_cpcbinfo, &sin6->sin6_addr,
412                                sin6->sin6_port,
413                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
414                               ? addr6 : &inp->in6p_laddr,
415                               inp->inp_lport, 0, NULL) != NULL) {
416                 return (EADDRINUSE);
417         }
418         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
419                 if (inp->inp_lport == 0) {
420                         error = in6_pcbbind(inp, NULL, td);
421                         if (error)
422                                 return (error);
423                 }
424                 inp->in6p_laddr = *addr6;
425         }
426         inp->in6p_faddr = sin6->sin6_addr;
427         inp->inp_fport = sin6->sin6_port;
428         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
429         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
430         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
431                 inp->in6p_flowinfo |=
432                     (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
433
434         in_pcbinsconnhash(inp);
435         return (0);
436 }
437
438 #if 0
439 /*
440  * Return an IPv6 address, which is the most appropriate for given
441  * destination and user specified options.
442  * If necessary, this function lookups the routing table and return
443  * an entry to the caller for later use.
444  */
445 struct in6_addr *
446 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
447               struct ip6_moptions *mopts, struct route_in6 *ro,
448               struct in6_addr *laddr, int *errorp, struct thread *td)
449 {
450         struct sockaddr_in6 jsin6;
451         struct ucred *cred = NULL;
452         struct in6_addr *dst;
453         struct in6_ifaddr *ia6 = 0;
454         struct in6_pktinfo *pi = NULL;
455         int jailed = 0;
456
457         if (td && td->td_proc && td->td_proc->p_ucred)
458                 cred = td->td_proc->p_ucred;
459         if (cred && cred->cr_prison)
460                 jailed = 1;
461         jsin6.sin6_family = AF_INET6;
462         dst = &dstsock->sin6_addr;
463         *errorp = 0;
464
465         /*
466          * If the source address is explicitly specified by the caller,
467          * use it.
468          */
469         if (opts && (pi = opts->ip6po_pktinfo) &&
470             !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
471                 jsin6.sin6_addr = pi->ipi6_addr;
472                 if (jailed && !jailed_ip(cred->cr_prison,
473                     (struct sockaddr *)&jsin6)) {
474                         return(0);
475                 } else {
476                         return (&pi->ipi6_addr);
477                 }
478         }
479
480         /*
481          * If the source address is not specified but the socket(if any)
482          * is already bound, use the bound address.
483          */
484         if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) {
485                 jsin6.sin6_addr = *laddr;
486                 if (jailed && !jailed_ip(cred->cr_prison,
487                     (struct sockaddr *)&jsin6)) {
488                         return(0);
489                 } else {
490                         return (laddr);
491                 }
492         }
493
494         /*
495          * If the caller doesn't specify the source address but
496          * the outgoing interface, use an address associated with
497          * the interface.
498          */
499         if (pi && pi->ipi6_ifindex) {
500                 /* XXX boundary check is assumed to be already done. */
501                 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
502                                        dst, cred);
503
504                 if (ia6 && jailed) {
505                         jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
506                         if (!jailed_ip(cred->cr_prison,
507                                 (struct sockaddr *)&jsin6))
508                                 ia6 = 0;
509                 }
510
511                 if (ia6 == 0) {
512                         *errorp = EADDRNOTAVAIL;
513                         return (0);
514                 }
515                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
516         }
517
518         /*
519          * If the destination address is a link-local unicast address or
520          * a multicast address, and if the outgoing interface is specified
521          * by the sin6_scope_id filed, use an address associated with the
522          * interface.
523          * XXX: We're now trying to define more specific semantics of
524          *      sin6_scope_id field, so this part will be rewritten in
525          *      the near future.
526          */
527         if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
528             dstsock->sin6_scope_id) {
529                 /*
530                  * I'm not sure if boundary check for scope_id is done
531                  * somewhere...
532                  */
533                 if (dstsock->sin6_scope_id < 0 ||
534                     if_index < dstsock->sin6_scope_id) {
535                         *errorp = ENXIO; /* XXX: better error? */
536                         return (0);
537                 }
538                 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
539                                        dst, cred);
540
541                 if (ia6 && jailed) {
542                         jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
543                         if (!jailed_ip(cred->cr_prison,
544                                 (struct sockaddr *)&jsin6))
545                                 ia6 = 0;
546                 }
547
548                 if (ia6 == 0) {
549                         *errorp = EADDRNOTAVAIL;
550                         return (0);
551                 }
552                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
553         }
554
555         /*
556          * If the destination address is a multicast address and
557          * the outgoing interface for the address is specified
558          * by the caller, use an address associated with the interface.
559          * There is a sanity check here; if the destination has node-local
560          * scope, the outgoing interfacde should be a loopback address.
561          * Even if the outgoing interface is not specified, we also
562          * choose a loopback interface as the outgoing interface.
563          */
564         if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
565                 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
566
567                 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
568                         ifp = &loif[0];
569                 }
570
571                 if (ifp) {
572                         ia6 = in6_ifawithscope(ifp, dst, cred);
573                         if (ia6 == 0) {
574                                 *errorp = EADDRNOTAVAIL;
575                                 return (0);
576                         }
577                         return (&ia6->ia_addr.sin6_addr);
578                 }
579         }
580
581         /*
582          * If the next hop address for the packet is specified
583          * by caller, use an address associated with the route
584          * to the next hop.
585          */
586         {
587                 struct sockaddr_in6 *sin6_next;
588                 struct rtentry *rt;
589
590                 if (opts && opts->ip6po_nexthop) {
591                         sin6_next = satosin6(opts->ip6po_nexthop);
592                         rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
593                         if (rt) {
594                                 ia6 = in6_ifawithscope(rt->rt_ifp, dst, cred);
595                                 if (ia6 == 0)
596                                         ia6 = ifatoia6(rt->rt_ifa);
597                         }
598                         if (ia6 && jailed) {
599                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
600                                 if (!jailed_ip(cred->cr_prison,
601                                         (struct sockaddr *)&jsin6))
602                                         ia6 = 0;
603                         }
604
605                         if (ia6 == 0) {
606                                 *errorp = EADDRNOTAVAIL;
607                                 return (0);
608                         }
609                         return (&satosin6(&ia6->ia_addr)->sin6_addr);
610                 }
611         }
612
613         /*
614          * If route is known or can be allocated now,
615          * our src addr is taken from the i/f, else punt.
616          */
617         if (ro) {
618                 if (ro->ro_rt &&
619                     !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
620                         RTFREE(ro->ro_rt);
621                         ro->ro_rt = NULL;
622                 }
623                 if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
624                         struct sockaddr_in6 *dst6;
625
626                         /* No route yet, so try to acquire one */
627                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
628                         dst6 = &ro->ro_dst;
629                         dst6->sin6_family = AF_INET6;
630                         dst6->sin6_len = sizeof(struct sockaddr_in6);
631                         dst6->sin6_addr = *dst;
632                         if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
633                                 ro->ro_rt =
634                                   rtpurelookup((struct sockaddr *)&ro->ro_dst);
635                         } else {
636                                 rtalloc((struct route *)ro);
637                         }
638                 }
639
640                 /*
641                  * in_pcbconnect() checks out IFF_LOOPBACK to skip using
642                  * the address. But we don't know why it does so.
643                  * It is necessary to ensure the scope even for lo0
644                  * so doesn't check out IFF_LOOPBACK.
645                  */
646
647                 if (ro->ro_rt) {
648                         ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst, cred);
649                         if (ia6 && jailed) {
650                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
651                                 if (!jailed_ip(cred->cr_prison,
652                                         (struct sockaddr *)&jsin6))
653                                         ia6 = 0;
654                         }
655
656                         if (ia6 == 0) /* xxx scope error ?*/
657                                 ia6 = ifatoia6(ro->ro_rt->rt_ifa);
658
659                         if (ia6 && jailed) {
660                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
661                                 if (!jailed_ip(cred->cr_prison,
662                                         (struct sockaddr *)&jsin6))
663                                         ia6 = 0;
664                         }
665                 }
666                 if (ia6 == 0) {
667                         *errorp = EHOSTUNREACH; /* no route */
668                         return (0);
669                 }
670                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
671         }
672
673         *errorp = EADDRNOTAVAIL;
674         return (0);
675 }
676
677 /*
678  * Default hop limit selection. The precedence is as follows:
679  * 1. Hoplimit valued specified via ioctl.
680  * 2. (If the outgoing interface is detected) the current
681  *     hop limit of the interface specified by router advertisement.
682  * 3. The system default hoplimit.
683 */
684 int
685 in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp)
686 {
687         if (in6p && in6p->in6p_hops >= 0)
688                 return (in6p->in6p_hops);
689         else if (ifp)
690                 return (ND_IFINFO(ifp)->chlim);
691         else
692                 return (ip6_defhlim);
693 }
694 #endif
695
696 void
697 in6_pcbdisconnect(struct inpcb *inp)
698 {
699         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
700         inp->inp_fport = 0;
701         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
702         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
703         in_pcbremconnhash(inp);
704         if (inp->inp_socket->so_state & SS_NOFDREF)
705                 in6_pcbdetach(inp);
706 }
707
708 void
709 in6_pcbdetach(struct inpcb *inp)
710 {
711         struct socket *so = inp->inp_socket;
712         struct inpcbinfo *ipi = inp->inp_pcbinfo;
713
714 #ifdef IPSEC
715         if (inp->in6p_sp != NULL)
716                 ipsec6_delete_pcbpolicy(inp);
717 #endif /* IPSEC */
718         inp->inp_gencnt = ++ipi->ipi_gencnt;
719         in_pcbremlists(inp);
720         so->so_pcb = NULL;
721         KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
722         sofree(so);             /* remove pcb ref */
723
724         if (inp->in6p_options)
725                 m_freem(inp->in6p_options);
726         ip6_freepcbopts(inp->in6p_outputopts);
727         ip6_freemoptions(inp->in6p_moptions);
728         if (inp->in6p_route.ro_rt)
729                 rtfree(inp->in6p_route.ro_rt);
730         /* Check and free IPv4 related resources in case of mapped addr */
731         if (inp->inp_options)
732                 m_free(inp->inp_options);
733         ip_freemoptions(inp->inp_moptions);
734
735         inp->inp_vflag = 0;
736         kfree(inp, M_PCB);
737 }
738
739 /*
740  * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
741  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
742  * in struct pr_usrreqs, so that protocols can just reference then directly
743  * without the need for a wrapper function.  The socket must have a valid
744  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
745  * except through a kernel programming error, so it is acceptable to panic
746  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
747  * because there actually /is/ a programming error somewhere... XXX)
748  */
749 void
750 in6_setsockaddr_dispatch(netmsg_t msg)
751 {
752         int error;
753
754         error = in6_setsockaddr(msg->sockaddr.base.nm_so, msg->sockaddr.nm_nam);
755         lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
756 }
757
758 int
759 in6_setsockaddr(struct socket *so, struct sockaddr **nam)
760 {
761         struct inpcb *inp;
762         struct sockaddr_in6 *sin6;
763
764         /*
765          * Do the malloc first in case it blocks.
766          */
767         sin6 = kmalloc(sizeof *sin6, M_SONAME, M_WAITOK | M_ZERO);
768         sin6->sin6_family = AF_INET6;
769         sin6->sin6_len = sizeof(*sin6);
770
771         crit_enter();
772         inp = so->so_pcb;
773         if (!inp) {
774                 crit_exit();
775                 kfree(sin6, M_SONAME);
776                 return EINVAL;
777         }
778         sin6->sin6_port = inp->inp_lport;
779         sin6->sin6_addr = inp->in6p_laddr;
780         crit_exit();
781         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
782                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
783         else
784                 sin6->sin6_scope_id = 0;        /*XXX*/
785         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
786                 sin6->sin6_addr.s6_addr16[1] = 0;
787
788         *nam = (struct sockaddr *)sin6;
789         return 0;
790 }
791
792 void
793 in6_setpeeraddr_dispatch(netmsg_t msg)
794 {
795         int error;
796
797         error = in6_setpeeraddr(msg->peeraddr.base.nm_so, msg->peeraddr.nm_nam);
798         lwkt_replymsg(&msg->peeraddr.base.lmsg, error);
799 }
800
801 int
802 in6_setpeeraddr(struct socket *so, struct sockaddr **nam)
803 {
804         struct inpcb *inp;
805         struct sockaddr_in6 *sin6;
806
807         /*
808          * Do the malloc first in case it blocks.
809          */
810         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
811         sin6->sin6_family = AF_INET6;
812         sin6->sin6_len = sizeof(struct sockaddr_in6);
813
814         crit_enter();
815         inp = so->so_pcb;
816         if (!inp) {
817                 crit_exit();
818                 kfree(sin6, M_SONAME);
819                 return EINVAL;
820         }
821         sin6->sin6_port = inp->inp_fport;
822         sin6->sin6_addr = inp->in6p_faddr;
823         crit_exit();
824         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
825                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
826         else
827                 sin6->sin6_scope_id = 0;        /*XXX*/
828         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
829                 sin6->sin6_addr.s6_addr16[1] = 0;
830
831         *nam = (struct sockaddr *)sin6;
832         return 0;
833 }
834
835 void
836 in6_mapped_sockaddr_dispatch(netmsg_t msg)
837 {
838         int error;
839
840         error = in6_mapped_sockaddr(msg->sockaddr.base.nm_so,
841                                     msg->sockaddr.nm_nam);
842         lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
843 }
844
845 int
846 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
847 {
848         struct  inpcb *inp = so->so_pcb;
849         int     error;
850
851         if (inp == NULL)
852                 return EINVAL;
853         if (inp->inp_vflag & INP_IPV4) {
854                 error = in_setsockaddr(so, nam);
855                 if (error == 0)
856                         in6_sin_2_v4mapsin6_in_sock(nam);
857         } else
858         /* scope issues will be handled in in6_setsockaddr(). */
859         error = in6_setsockaddr(so, nam);
860
861         return error;
862 }
863
864 int
865 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
866 {
867         struct  inpcb *inp = so->so_pcb;
868         int     error;
869
870         if (inp == NULL)
871                 return EINVAL;
872         if (inp->inp_vflag & INP_IPV4) {
873                 error = in_setpeeraddr(so, nam);
874                 if (error == 0)
875                         in6_sin_2_v4mapsin6_in_sock(nam);
876         } else
877         /* scope issues will be handled in in6_setpeeraddr(). */
878         error = in6_setpeeraddr(so, nam);
879
880         return error;
881 }
882
883 void
884 in6_mapped_peeraddr_dispatch(netmsg_t msg)
885 {
886         int error;
887
888         error = in6_mapped_peeraddr(msg->base.nm_so, msg->peeraddr.nm_nam);
889         lwkt_replymsg(&msg->base.lmsg, error);
890 }
891
892 /*
893  * Pass some notification to all connections of a protocol
894  * associated with address dst.  The local address and/or port numbers
895  * may be specified to limit the search.  The "usual action" will be
896  * taken, depending on the ctlinput cmd.  The caller must filter any
897  * cmds that are uninteresting (e.g., no error in the map).
898  * Call the protocol specific routine (if any) to report
899  * any errors for each matching socket.
900  *
901  * Must be called under crit_enter().
902  */
903 void
904 in6_pcbnotify(struct inpcbhead *head, struct sockaddr *dst, in_port_t fport,
905               const struct sockaddr *src, in_port_t lport, int cmd, int arg,
906               void (*notify) (struct inpcb *, int))
907 {
908         struct inpcb *inp, *ninp;
909         struct sockaddr_in6 sa6_src, *sa6_dst;
910         u_int32_t flowinfo;
911
912         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
913                 return;
914
915         sa6_dst = (struct sockaddr_in6 *)dst;
916         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
917                 return;
918
919         /*
920          * note that src can be NULL when we get notify by local fragmentation.
921          */
922         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
923         flowinfo = sa6_src.sin6_flowinfo;
924
925         /*
926          * Redirects go to all references to the destination,
927          * and use in6_rtchange to invalidate the route cache.
928          * Dead host indications: also use in6_rtchange to invalidate
929          * the cache, and deliver the error to all the sockets.
930          * Otherwise, if we have knowledge of the local port and address,
931          * deliver only to that socket.
932          */
933         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
934                 fport = 0;
935                 lport = 0;
936                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
937
938                 if (cmd != PRC_HOSTDEAD)
939                         notify = in6_rtchange;
940         }
941         if (cmd != PRC_MSGSIZE)
942                 arg = inet6ctlerrmap[cmd];
943         crit_enter();
944         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
945                 ninp = LIST_NEXT(inp, inp_list);
946
947                 if (inp->inp_flags & INP_PLACEMARKER)
948                         continue;
949
950                 if ((inp->inp_vflag & INP_IPV6) == 0)
951                         continue;
952                 /*
953                  * If the error designates a new path MTU for a destination
954                  * and the application (associated with this socket) wanted to
955                  * know the value, notify. Note that we notify for all
956                  * disconnected sockets if the corresponding application
957                  * wanted. This is because some UDP applications keep sending
958                  * sockets disconnected.
959                  * XXX: should we avoid to notify the value to TCP sockets?
960                  */
961                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
962                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
963                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
964                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, &arg);
965                 }
966
967                 /*
968                  * Detect if we should notify the error. If no source and
969                  * destination ports are specifed, but non-zero flowinfo and
970                  * local address match, notify the error. This is the case
971                  * when the error is delivered with an encrypted buffer
972                  * by ESP. Otherwise, just compare addresses and ports
973                  * as usual.
974                  */
975                 if (lport == 0 && fport == 0 && flowinfo &&
976                     inp->inp_socket != NULL &&
977                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
978                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
979                         goto do_notify;
980                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
981                                              &sa6_dst->sin6_addr) ||
982                          inp->inp_socket == 0 ||
983                          (lport && inp->inp_lport != lport) ||
984                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
985                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
986                                               &sa6_src.sin6_addr)) ||
987                          (fport && inp->inp_fport != fport))
988                         continue;
989
990 do_notify:
991                 if (notify)
992                         (*notify)(inp, arg);
993         }
994         crit_exit();
995 }
996
997 /*
998  * Lookup a PCB based on the local address and port.
999  */
1000 struct inpcb *
1001 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
1002                     u_int lport_arg, int wild_okay, struct ucred *cred)
1003 {
1004         struct inpcb *inp;
1005         int matchwild = 3, wildcard;
1006         u_short lport = lport_arg;
1007         struct inpcbporthead *porthash;
1008         struct inpcbport *phd;
1009         struct inpcb *match = NULL;
1010
1011         /*
1012          * If the porthashbase is shared across several cpus, it must
1013          * have been locked.
1014          */
1015         if (pcbinfo->porttoken)
1016                 ASSERT_LWKT_TOKEN_HELD(pcbinfo->porttoken);
1017
1018         /*
1019          * Best fit PCB lookup.
1020          *
1021          * First see if this local port is in use by looking on the
1022          * port hash list.
1023          */
1024         porthash = &pcbinfo->porthashbase[
1025                                 INP_PCBPORTHASH(lport, pcbinfo->porthashmask)];
1026         LIST_FOREACH(phd, porthash, phd_hash) {
1027                 if (phd->phd_port == lport)
1028                         break;
1029         }
1030
1031         if (phd != NULL) {
1032                 /*
1033                  * Port is in use by one or more PCBs. Look for best
1034                  * fit.
1035                  */
1036                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1037                         wildcard = 0;
1038                         if ((inp->inp_vflag & INP_IPV6) == 0)
1039                                 continue;
1040                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
1041                                 wildcard++;
1042                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1043                                 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
1044                                         wildcard++;
1045                                 else if (!IN6_ARE_ADDR_EQUAL(
1046                                         &inp->in6p_laddr, laddr))
1047                                         continue;
1048                         } else {
1049                                 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
1050                                         wildcard++;
1051                         }
1052                         if (wildcard && !wild_okay)
1053                                 continue;
1054                         if (wildcard < matchwild &&
1055                             (cred == NULL ||
1056                              cred->cr_prison == 
1057                                         inp->inp_socket->so_cred->cr_prison)) {
1058                                 match = inp;
1059                                 matchwild = wildcard;
1060                                 if (wildcard == 0)
1061                                         break;
1062                                 else
1063                                         matchwild = wildcard;
1064                         }
1065                 }
1066         }
1067         return (match);
1068 }
1069
1070 void
1071 in6_pcbpurgeif0(struct in6pcb *head, struct ifnet *ifp)
1072 {
1073         struct in6pcb *in6p;
1074         struct ip6_moptions *im6o;
1075         struct in6_multi_mship *imm, *nimm;
1076
1077         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
1078                 if (in6p->in6p_flags & INP_PLACEMARKER)
1079                         continue;
1080                 im6o = in6p->in6p_moptions;
1081                 if ((in6p->inp_vflag & INP_IPV6) &&
1082                     im6o) {
1083                         /*
1084                          * Unselect the outgoing interface if it is being
1085                          * detached.
1086                          */
1087                         if (im6o->im6o_multicast_ifp == ifp)
1088                                 im6o->im6o_multicast_ifp = NULL;
1089
1090                         /*
1091                          * Drop multicast group membership if we joined
1092                          * through the interface being detached.
1093                          * XXX controversial - is it really legal for kernel
1094                          * to force this?
1095                          */
1096                         for (imm = im6o->im6o_memberships.lh_first;
1097                              imm != NULL; imm = nimm) {
1098                                 nimm = imm->i6mm_chain.le_next;
1099                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
1100                                         LIST_REMOVE(imm, i6mm_chain);
1101                                         in6_delmulti(imm->i6mm_maddr);
1102                                         kfree(imm, M_IPMADDR);
1103                                 }
1104                         }
1105                 }
1106         }
1107 }
1108
1109 /*
1110  * Check for alternatives when higher level complains
1111  * about service problems.  For now, invalidate cached
1112  * routing information.  If the route was created dynamically
1113  * (by a redirect), time to try a default gateway again.
1114  */
1115 void
1116 in6_losing(struct inpcb *in6p)
1117 {
1118         struct rtentry *rt;
1119         struct rt_addrinfo info;
1120
1121         if ((rt = in6p->in6p_route.ro_rt) != NULL) {
1122                 bzero((caddr_t)&info, sizeof(info));
1123                 info.rti_flags = rt->rt_flags;
1124                 info.rti_info[RTAX_DST] = rt_key(rt);
1125                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1126                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1127                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
1128                 if (rt->rt_flags & RTF_DYNAMIC) {
1129                         rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1130                             rt_mask(rt), rt->rt_flags, NULL);
1131                 }
1132                 in6p->in6p_route.ro_rt = NULL;
1133                 rtfree(rt);
1134                 /*
1135                  * A new route can be allocated
1136                  * the next time output is attempted.
1137                  */
1138         }
1139 }
1140
1141 /*
1142  * After a routing change, flush old routing
1143  * and allocate a (hopefully) better one.
1144  */
1145 void
1146 in6_rtchange(struct inpcb *inp, int error)
1147 {
1148         if (inp->in6p_route.ro_rt) {
1149                 rtfree(inp->in6p_route.ro_rt);
1150                 inp->in6p_route.ro_rt = 0;
1151                 /*
1152                  * A new route can be allocated the next time
1153                  * output is attempted.
1154                  */
1155         }
1156 }
1157
1158 /*
1159  * Lookup PCB in hash list.
1160  */
1161 struct inpcb *
1162 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1163                    u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1164                    int wildcard, struct ifnet *ifp)
1165 {
1166         struct inpcbhead *head;
1167         struct inpcb *inp;
1168         struct inpcb *jinp = NULL;
1169         u_short fport = fport_arg, lport = lport_arg;
1170         int faith;
1171
1172         if (faithprefix_p != NULL)
1173                 faith = (*faithprefix_p)(laddr);
1174         else
1175                 faith = 0;
1176
1177         /*
1178          * First look for an exact match.
1179          */
1180         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */,
1181                                               fport,
1182                                               laddr->s6_addr32[3], /* XXX JH */
1183                                               lport,
1184                                               pcbinfo->hashmask)];
1185         LIST_FOREACH(inp, head, inp_hash) {
1186                 if ((inp->inp_vflag & INP_IPV6) == 0)
1187                         continue;
1188                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1189                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1190                     inp->inp_fport == fport &&
1191                     inp->inp_lport == lport) {
1192                         /*
1193                          * Found.
1194                          */
1195                         if (inp->inp_socket == NULL ||
1196                         inp->inp_socket->so_cred->cr_prison == NULL) {
1197                                 return (inp);
1198                         } else {
1199                                 if  (jinp == NULL)
1200                                         jinp = inp;
1201                         }
1202                 }
1203         }
1204         if (jinp != NULL)
1205                 return(jinp);
1206         if (wildcard) {
1207                 struct inpcontainerhead *chead;
1208                 struct inpcontainer *ic;
1209                 struct inpcb *local_wild = NULL;
1210                 struct inpcb *jinp_wild = NULL;
1211                 struct sockaddr_in6 jsin6;
1212                 struct ucred *cred;
1213
1214                 /*
1215                  * Order of socket selection:
1216                  * 1. non-jailed, non-wild.
1217                  * 2. non-jailed, wild.
1218                  * 3. jailed, non-wild.
1219                  * 4. jailed, wild.
1220                  */
1221                 jsin6.sin6_family = AF_INET6;
1222                 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport,
1223                     pcbinfo->wildcardhashmask)];
1224                 LIST_FOREACH(ic, chead, ic_list) {
1225                         inp = ic->ic_inp;
1226
1227                         if (!(inp->inp_vflag & INP_IPV6))
1228                                 continue;
1229                         if (inp->inp_socket != NULL)
1230                                 cred = inp->inp_socket->so_cred;
1231                         else
1232                                 cred = NULL;
1233
1234                         if (cred != NULL && jailed(cred)) {
1235                                 if (jinp != NULL) {
1236                                         continue;
1237                                 } else {
1238                                         jsin6.sin6_addr = *laddr;
1239                                         if (!jailed_ip(cred->cr_prison,
1240                                             (struct sockaddr *)&jsin6))
1241                                                 continue;
1242                                 }
1243                         }
1244                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1245                             inp->inp_lport == lport) {
1246                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
1247                                         continue;
1248                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
1249                                                        laddr)) {
1250                                         if (cred != NULL && jailed(cred))
1251                                                 jinp = inp;
1252                                         else
1253                                                 return (inp);
1254                                 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1255                                         if (cred != NULL && jailed(cred))
1256                                                 jinp_wild = inp;
1257                                         else
1258                                                 local_wild = inp;
1259                                 }
1260                         }
1261                 }
1262                 if (local_wild != NULL)
1263                         return (local_wild);
1264                 if (jinp != NULL)
1265                         return (jinp);
1266                 return (jinp_wild);
1267         }
1268
1269         /*
1270          * Not found.
1271          */
1272         return (NULL);
1273 }
1274
1275 void
1276 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1277 {
1278         struct ip6_hdr *ip;
1279
1280         ip = mtod(m, struct ip6_hdr *);
1281         bzero(sin6, sizeof(*sin6));
1282         sin6->sin6_len = sizeof(*sin6);
1283         sin6->sin6_family = AF_INET6;
1284         sin6->sin6_addr = ip->ip6_src;
1285         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1286                 sin6->sin6_addr.s6_addr16[1] = 0;
1287         sin6->sin6_scope_id =
1288                 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1289                 ? m->m_pkthdr.rcvif->if_index : 0;
1290
1291         return;
1292 }
1293
1294 static void
1295 in6_savefaddr(struct socket *so, const struct sockaddr *faddr)
1296 {
1297         struct sockaddr_in6 *sin6;
1298
1299         KASSERT(faddr->sa_family == AF_INET6,
1300             ("not AF_INET6 faddr %d", faddr->sa_family));
1301
1302         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
1303         sin6->sin6_family = AF_INET6;
1304         sin6->sin6_len = sizeof(*sin6);
1305
1306         sin6->sin6_port = ((const struct sockaddr_in6 *)faddr)->sin6_port;
1307         sin6->sin6_addr = ((const struct sockaddr_in6 *)faddr)->sin6_addr;
1308
1309         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1310                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
1311         else
1312                 sin6->sin6_scope_id = 0;        /*XXX*/
1313         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1314                 sin6->sin6_addr.s6_addr16[1] = 0;
1315
1316         so->so_faddr = (struct sockaddr *)sin6;
1317 }
1318
1319 void
1320 in6_mapped_savefaddr(struct socket *so, const struct sockaddr *faddr)
1321 {
1322         if (faddr->sa_family == AF_INET) {
1323                 in_savefaddr(so, faddr);
1324                 in6_sin_2_v4mapsin6_in_sock(&so->so_faddr);
1325         } else {
1326                 in6_savefaddr(so, faddr);
1327         }
1328 }