xref: /freebsd/sys/netinet6/in6_pcb.c (revision 39beb93c3f8bdbf72a61fda42300b5ebed7390c8)
1 /*-
2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the project nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  *	$KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $
30  */
31 
32 /*-
33  * Copyright (c) 1982, 1986, 1991, 1993
34  *	The Regents of the University of California.  All rights reserved.
35  *
36  * Redistribution and use in source and binary forms, with or without
37  * modification, are permitted provided that the following conditions
38  * are met:
39  * 1. Redistributions of source code must retain the above copyright
40  *    notice, this list of conditions and the following disclaimer.
41  * 2. Redistributions in binary form must reproduce the above copyright
42  *    notice, this list of conditions and the following disclaimer in the
43  *    documentation and/or other materials provided with the distribution.
44  * 4. Neither the name of the University nor the names of its contributors
45  *    may be used to endorse or promote products derived from this software
46  *    without specific prior written permission.
47  *
48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58  * SUCH DAMAGE.
59  *
60  *	@(#)in_pcb.c	8.2 (Berkeley) 1/4/94
61  */
62 
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
65 
66 #include "opt_inet.h"
67 #include "opt_inet6.h"
68 #include "opt_ipsec.h"
69 #include "opt_mac.h"
70 
71 #include <sys/param.h>
72 #include <sys/systm.h>
73 #include <sys/malloc.h>
74 #include <sys/mbuf.h>
75 #include <sys/domain.h>
76 #include <sys/protosw.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/sockio.h>
80 #include <sys/errno.h>
81 #include <sys/time.h>
82 #include <sys/priv.h>
83 #include <sys/proc.h>
84 #include <sys/jail.h>
85 #include <sys/vimage.h>
86 
87 #include <vm/uma.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/tcp_var.h>
97 #include <netinet/ip6.h>
98 #include <netinet/ip_var.h>
99 #include <netinet/vinet.h>
100 
101 #include <netinet6/ip6_var.h>
102 #include <netinet6/nd6.h>
103 #include <netinet/in_pcb.h>
104 #include <netinet6/in6_pcb.h>
105 #include <netinet6/scope6_var.h>
106 #include <netinet6/vinet6.h>
107 
108 #include <security/mac/mac_framework.h>
109 
110 struct	in6_addr zeroin6_addr;
111 
112 int
113 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam,
114     struct ucred *cred)
115 {
116 	INIT_VNET_INET6(inp->inp_vnet);
117 	INIT_VNET_INET(inp->inp_vnet);
118 	struct socket *so = inp->inp_socket;
119 	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
120 	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
121 	u_short	lport = 0;
122 	int error, wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
123 
124 	INP_INFO_WLOCK_ASSERT(pcbinfo);
125 	INP_WLOCK_ASSERT(inp);
126 
127 	if (!V_in6_ifaddr) /* XXX broken! */
128 		return (EADDRNOTAVAIL);
129 	if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
130 		return (EINVAL);
131 	if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
132 		wild = INPLOOKUP_WILDCARD;
133 	if (nam == NULL) {
134 		if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
135 		    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
136 			return (error);
137 	} else {
138 		sin6 = (struct sockaddr_in6 *)nam;
139 		if (nam->sa_len != sizeof(*sin6))
140 			return (EINVAL);
141 		/*
142 		 * family check.
143 		 */
144 		if (nam->sa_family != AF_INET6)
145 			return (EAFNOSUPPORT);
146 
147 		if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
148 			return(error);
149 
150 		if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
151 		    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
152 			return (error);
153 
154 		lport = sin6->sin6_port;
155 		if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
156 			/*
157 			 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
158 			 * allow compepte duplication of binding if
159 			 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
160 			 * and a multicast address is bound on both
161 			 * new and duplicated sockets.
162 			 */
163 			if (so->so_options & SO_REUSEADDR)
164 				reuseport = SO_REUSEADDR|SO_REUSEPORT;
165 		} else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
166 			struct ifaddr *ia = NULL;
167 
168 			sin6->sin6_port = 0;		/* yech... */
169 			if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
170 				return (EADDRNOTAVAIL);
171 
172 			/*
173 			 * XXX: bind to an anycast address might accidentally
174 			 * cause sending a packet with anycast source address.
175 			 * We should allow to bind to a deprecated address, since
176 			 * the application dares to use it.
177 			 */
178 			if (ia &&
179 			    ((struct in6_ifaddr *)ia)->ia6_flags &
180 			    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
181 				return (EADDRNOTAVAIL);
182 			}
183 		}
184 		if (lport) {
185 			struct inpcb *t;
186 
187 			/* GROSS */
188 			if (ntohs(lport) <= V_ipport_reservedhigh &&
189 			    ntohs(lport) >= V_ipport_reservedlow &&
190 			    priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
191 			    0))
192 				return (EACCES);
193 			if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
194 			    priv_check_cred(inp->inp_cred,
195 			    PRIV_NETINET_REUSEPORT, 0) != 0) {
196 				t = in6_pcblookup_local(pcbinfo,
197 				    &sin6->sin6_addr, lport,
198 				    INPLOOKUP_WILDCARD, cred);
199 				if (t &&
200 				    ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
201 				    (so->so_type != SOCK_STREAM ||
202 				     IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
203 				    (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
204 				     !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
205 				     (t->inp_socket->so_options & SO_REUSEPORT)
206 				      == 0) && (inp->inp_cred->cr_uid !=
207 				     t->inp_cred->cr_uid))
208 					return (EADDRINUSE);
209 				if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
210 				    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
211 					struct sockaddr_in sin;
212 
213 					in6_sin6_2_sin(&sin, sin6);
214 					t = in_pcblookup_local(pcbinfo,
215 					    sin.sin_addr, lport,
216 					    INPLOOKUP_WILDCARD, cred);
217 					if (t &&
218 					    ((t->inp_vflag &
219 					      INP_TIMEWAIT) == 0) &&
220 					    (so->so_type != SOCK_STREAM ||
221 					     ntohl(t->inp_faddr.s_addr) ==
222 					      INADDR_ANY) &&
223 					    (inp->inp_cred->cr_uid !=
224 					     t->inp_cred->cr_uid))
225 						return (EADDRINUSE);
226 				}
227 			}
228 			t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
229 			    lport, wild, cred);
230 			if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ?
231 			    intotw(t)->tw_so_options :
232 			    t->inp_socket->so_options)) == 0)
233 				return (EADDRINUSE);
234 			if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
235 			    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
236 				struct sockaddr_in sin;
237 
238 				in6_sin6_2_sin(&sin, sin6);
239 				t = in_pcblookup_local(pcbinfo, sin.sin_addr,
240 				    lport, wild, cred);
241 				if (t && t->inp_vflag & INP_TIMEWAIT) {
242 					if ((reuseport &
243 					    intotw(t)->tw_so_options) == 0 &&
244 					    (ntohl(t->inp_laddr.s_addr) !=
245 					     INADDR_ANY || ((inp->inp_vflag &
246 					     INP_IPV6PROTO) ==
247 					     (t->inp_vflag & INP_IPV6PROTO))))
248 						return (EADDRINUSE);
249 				}
250 				else if (t &&
251 				    (reuseport & t->inp_socket->so_options)
252 				    == 0 && (ntohl(t->inp_laddr.s_addr) !=
253 				    INADDR_ANY || INP_SOCKAF(so) ==
254 				     INP_SOCKAF(t->inp_socket)))
255 					return (EADDRINUSE);
256 			}
257 		}
258 		inp->in6p_laddr = sin6->sin6_addr;
259 	}
260 	if (lport == 0) {
261 		if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0)
262 			return (error);
263 	} else {
264 		inp->inp_lport = lport;
265 		if (in_pcbinshash(inp) != 0) {
266 			inp->in6p_laddr = in6addr_any;
267 			inp->inp_lport = 0;
268 			return (EAGAIN);
269 		}
270 	}
271 	return (0);
272 }
273 
274 /*
275  *   Transform old in6_pcbconnect() into an inner subroutine for new
276  *   in6_pcbconnect(): Do some validity-checking on the remote
277  *   address (in mbuf 'nam') and then determine local host address
278  *   (i.e., which interface) to use to access that remote host.
279  *
280  *   This preserves definition of in6_pcbconnect(), while supporting a
281  *   slightly different version for T/TCP.  (This is more than
282  *   a bit of a kludge, but cleaning up the internal interfaces would
283  *   have forced minor changes in every protocol).
284  */
285 int
286 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam,
287     struct in6_addr **plocal_addr6)
288 {
289 	INIT_VNET_INET6(inp->inp_vnet);
290 	register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
291 	int error = 0;
292 	struct ifnet *ifp = NULL;
293 	int scope_ambiguous = 0;
294 
295 	INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
296 	INP_WLOCK_ASSERT(inp);
297 
298 	if (nam->sa_len != sizeof (*sin6))
299 		return (EINVAL);
300 	if (sin6->sin6_family != AF_INET6)
301 		return (EAFNOSUPPORT);
302 	if (sin6->sin6_port == 0)
303 		return (EADDRNOTAVAIL);
304 
305 	if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
306 		scope_ambiguous = 1;
307 	if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
308 		return(error);
309 
310 	if (V_in6_ifaddr) {
311 		/*
312 		 * If the destination address is UNSPECIFIED addr,
313 		 * use the loopback addr, e.g ::1.
314 		 */
315 		if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
316 			sin6->sin6_addr = in6addr_loopback;
317 	}
318 	if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
319 		return (error);
320 
321 	/*
322 	 * XXX: in6_selectsrc might replace the bound local address
323 	 * with the address specified by setsockopt(IPV6_PKTINFO).
324 	 * Is it the intended behavior?
325 	 */
326 	*plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
327 				      inp, NULL,
328 				      inp->inp_cred,
329 				      &ifp, &error);
330 	if (ifp && scope_ambiguous &&
331 	    (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
332 		return(error);
333 	}
334 
335 	if (*plocal_addr6 == NULL) {
336 		if (error == 0)
337 			error = EADDRNOTAVAIL;
338 		return (error);
339 	}
340 	/*
341 	 * Don't do pcblookup call here; return interface in
342 	 * plocal_addr6
343 	 * and exit to caller, that will do the lookup.
344 	 */
345 
346 	return (0);
347 }
348 
349 /*
350  * Outer subroutine:
351  * Connect from a socket to a specified address.
352  * Both address and port must be specified in argument sin.
353  * If don't have a local address for this socket yet,
354  * then pick one.
355  */
356 int
357 in6_pcbconnect(register struct inpcb *inp, struct sockaddr *nam,
358     struct ucred *cred)
359 {
360 	struct in6_addr *addr6;
361 	register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
362 	int error;
363 
364 	INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
365 	INP_WLOCK_ASSERT(inp);
366 
367 	/*
368 	 * Call inner routine, to assign local interface address.
369 	 * in6_pcbladdr() may automatically fill in sin6_scope_id.
370 	 */
371 	if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
372 		return (error);
373 
374 	if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
375 			       sin6->sin6_port,
376 			      IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
377 			      ? addr6 : &inp->in6p_laddr,
378 			      inp->inp_lport, 0, NULL) != NULL) {
379 		return (EADDRINUSE);
380 	}
381 	if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
382 		if (inp->inp_lport == 0) {
383 			error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
384 			if (error)
385 				return (error);
386 		}
387 		inp->in6p_laddr = *addr6;
388 	}
389 	inp->in6p_faddr = sin6->sin6_addr;
390 	inp->inp_fport = sin6->sin6_port;
391 	/* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
392 	inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
393 	if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
394 		inp->inp_flow |=
395 		    (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
396 
397 	in_pcbrehash(inp);
398 
399 	return (0);
400 }
401 
402 void
403 in6_pcbdisconnect(struct inpcb *inp)
404 {
405 
406 	INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
407 	INP_WLOCK_ASSERT(inp);
408 
409 	bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
410 	inp->inp_fport = 0;
411 	/* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
412 	inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
413 	in_pcbrehash(inp);
414 }
415 
416 struct sockaddr *
417 in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
418 {
419 	struct sockaddr_in6 *sin6;
420 
421 	sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
422 	bzero(sin6, sizeof *sin6);
423 	sin6->sin6_family = AF_INET6;
424 	sin6->sin6_len = sizeof(*sin6);
425 	sin6->sin6_port = port;
426 	sin6->sin6_addr = *addr_p;
427 	(void)sa6_recoverscope(sin6); /* XXX: should catch errors */
428 
429 	return (struct sockaddr *)sin6;
430 }
431 
432 struct sockaddr *
433 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
434 {
435 	struct sockaddr_in sin;
436 	struct sockaddr_in6 *sin6_p;
437 
438 	bzero(&sin, sizeof sin);
439 	sin.sin_family = AF_INET;
440 	sin.sin_len = sizeof(sin);
441 	sin.sin_port = port;
442 	sin.sin_addr = *addr_p;
443 
444 	sin6_p = malloc(sizeof *sin6_p, M_SONAME,
445 		M_WAITOK);
446 	in6_sin_2_v4mapsin6(&sin, sin6_p);
447 
448 	return (struct sockaddr *)sin6_p;
449 }
450 
451 int
452 in6_getsockaddr(struct socket *so, struct sockaddr **nam)
453 {
454 	register struct inpcb *inp;
455 	struct in6_addr addr;
456 	in_port_t port;
457 
458 	inp = sotoinpcb(so);
459 	KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
460 
461 	INP_RLOCK(inp);
462 	port = inp->inp_lport;
463 	addr = inp->in6p_laddr;
464 	INP_RUNLOCK(inp);
465 
466 	*nam = in6_sockaddr(port, &addr);
467 	return 0;
468 }
469 
470 int
471 in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
472 {
473 	struct inpcb *inp;
474 	struct in6_addr addr;
475 	in_port_t port;
476 
477 	inp = sotoinpcb(so);
478 	KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
479 
480 	INP_RLOCK(inp);
481 	port = inp->inp_fport;
482 	addr = inp->in6p_faddr;
483 	INP_RUNLOCK(inp);
484 
485 	*nam = in6_sockaddr(port, &addr);
486 	return 0;
487 }
488 
489 int
490 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
491 {
492 	struct	inpcb *inp;
493 	int	error;
494 
495 	inp = sotoinpcb(so);
496 	KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
497 
498 	if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
499 		error = in_getsockaddr(so, nam);
500 		if (error == 0)
501 			in6_sin_2_v4mapsin6_in_sock(nam);
502 	} else {
503 		/* scope issues will be handled in in6_getsockaddr(). */
504 		error = in6_getsockaddr(so, nam);
505 	}
506 
507 	return error;
508 }
509 
510 int
511 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
512 {
513 	struct	inpcb *inp;
514 	int	error;
515 
516 	inp = sotoinpcb(so);
517 	KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
518 
519 	if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
520 		error = in_getpeeraddr(so, nam);
521 		if (error == 0)
522 			in6_sin_2_v4mapsin6_in_sock(nam);
523 	} else
524 	/* scope issues will be handled in in6_getpeeraddr(). */
525 	error = in6_getpeeraddr(so, nam);
526 
527 	return error;
528 }
529 
530 /*
531  * Pass some notification to all connections of a protocol
532  * associated with address dst.  The local address and/or port numbers
533  * may be specified to limit the search.  The "usual action" will be
534  * taken, depending on the ctlinput cmd.  The caller must filter any
535  * cmds that are uninteresting (e.g., no error in the map).
536  * Call the protocol specific routine (if any) to report
537  * any errors for each matching socket.
538  */
539 void
540 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
541     u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
542     int cmd, void *cmdarg,
543     struct inpcb *(*notify)(struct inpcb *, int))
544 {
545 	struct inpcb *inp, *inp_temp;
546 	struct sockaddr_in6 sa6_src, *sa6_dst;
547 	u_short	fport = fport_arg, lport = lport_arg;
548 	u_int32_t flowinfo;
549 	int errno;
550 
551 	if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
552 		return;
553 
554 	sa6_dst = (struct sockaddr_in6 *)dst;
555 	if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
556 		return;
557 
558 	/*
559 	 * note that src can be NULL when we get notify by local fragmentation.
560 	 */
561 	sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
562 	flowinfo = sa6_src.sin6_flowinfo;
563 
564 	/*
565 	 * Redirects go to all references to the destination,
566 	 * and use in6_rtchange to invalidate the route cache.
567 	 * Dead host indications: also use in6_rtchange to invalidate
568 	 * the cache, and deliver the error to all the sockets.
569 	 * Otherwise, if we have knowledge of the local port and address,
570 	 * deliver only to that socket.
571 	 */
572 	if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
573 		fport = 0;
574 		lport = 0;
575 		bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
576 
577 		if (cmd != PRC_HOSTDEAD)
578 			notify = in6_rtchange;
579 	}
580 	errno = inet6ctlerrmap[cmd];
581 	INP_INFO_WLOCK(pcbinfo);
582 	LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
583 		INP_WLOCK(inp);
584 		if ((inp->inp_vflag & INP_IPV6) == 0) {
585 			INP_WUNLOCK(inp);
586 			continue;
587 		}
588 
589 		/*
590 		 * If the error designates a new path MTU for a destination
591 		 * and the application (associated with this socket) wanted to
592 		 * know the value, notify. Note that we notify for all
593 		 * disconnected sockets if the corresponding application
594 		 * wanted. This is because some UDP applications keep sending
595 		 * sockets disconnected.
596 		 * XXX: should we avoid to notify the value to TCP sockets?
597 		 */
598 		if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
599 		    (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
600 		     IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
601 			ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
602 					(u_int32_t *)cmdarg);
603 		}
604 
605 		/*
606 		 * Detect if we should notify the error. If no source and
607 		 * destination ports are specifed, but non-zero flowinfo and
608 		 * local address match, notify the error. This is the case
609 		 * when the error is delivered with an encrypted buffer
610 		 * by ESP. Otherwise, just compare addresses and ports
611 		 * as usual.
612 		 */
613 		if (lport == 0 && fport == 0 && flowinfo &&
614 		    inp->inp_socket != NULL &&
615 		    flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
616 		    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
617 			goto do_notify;
618 		else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
619 					     &sa6_dst->sin6_addr) ||
620 			 inp->inp_socket == 0 ||
621 			 (lport && inp->inp_lport != lport) ||
622 			 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
623 			  !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
624 					      &sa6_src.sin6_addr)) ||
625 			 (fport && inp->inp_fport != fport)) {
626 			INP_WUNLOCK(inp);
627 			continue;
628 		}
629 
630 	  do_notify:
631 		if (notify) {
632 			if ((*notify)(inp, errno))
633 				INP_WUNLOCK(inp);
634 		} else
635 			INP_WUNLOCK(inp);
636 	}
637 	INP_INFO_WUNLOCK(pcbinfo);
638 }
639 
640 /*
641  * Lookup a PCB based on the local address and port.
642  */
643 struct inpcb *
644 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
645     u_short lport, int wild_okay, struct ucred *cred)
646 {
647 	register struct inpcb *inp;
648 	int matchwild = 3, wildcard;
649 
650 	INP_INFO_WLOCK_ASSERT(pcbinfo);
651 
652 	if (!wild_okay) {
653 		struct inpcbhead *head;
654 		/*
655 		 * Look for an unconnected (wildcard foreign addr) PCB that
656 		 * matches the local address and port we're looking for.
657 		 */
658 		head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
659 		    0, pcbinfo->ipi_hashmask)];
660 		LIST_FOREACH(inp, head, inp_hash) {
661 			/* XXX inp locking */
662 			if ((inp->inp_vflag & INP_IPV6) == 0)
663 				continue;
664 			if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
665 			    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
666 			    inp->inp_lport == lport) {
667 				/* Found. */
668 				if (cred == NULL ||
669 				    inp->inp_cred->cr_prison == cred->cr_prison)
670 					return (inp);
671 			}
672 		}
673 		/*
674 		 * Not found.
675 		 */
676 		return (NULL);
677 	} else {
678 		struct inpcbporthead *porthash;
679 		struct inpcbport *phd;
680 		struct inpcb *match = NULL;
681 		/*
682 		 * Best fit PCB lookup.
683 		 *
684 		 * First see if this local port is in use by looking on the
685 		 * port hash list.
686 		 */
687 		porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
688 		    pcbinfo->ipi_porthashmask)];
689 		LIST_FOREACH(phd, porthash, phd_hash) {
690 			if (phd->phd_port == lport)
691 				break;
692 		}
693 		if (phd != NULL) {
694 			/*
695 			 * Port is in use by one or more PCBs. Look for best
696 			 * fit.
697 			 */
698 			LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
699 				wildcard = 0;
700 				if (cred != NULL &&
701 				    inp->inp_cred->cr_prison != cred->cr_prison)
702 					continue;
703 				/* XXX inp locking */
704 				if ((inp->inp_vflag & INP_IPV6) == 0)
705 					continue;
706 				if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
707 					wildcard++;
708 				if (!IN6_IS_ADDR_UNSPECIFIED(
709 					&inp->in6p_laddr)) {
710 					if (IN6_IS_ADDR_UNSPECIFIED(laddr))
711 						wildcard++;
712 					else if (!IN6_ARE_ADDR_EQUAL(
713 					    &inp->in6p_laddr, laddr))
714 						continue;
715 				} else {
716 					if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
717 						wildcard++;
718 				}
719 				if (wildcard < matchwild) {
720 					match = inp;
721 					matchwild = wildcard;
722 					if (matchwild == 0)
723 						break;
724 				}
725 			}
726 		}
727 		return (match);
728 	}
729 }
730 
731 void
732 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
733 {
734 	struct inpcb *in6p;
735 	struct ip6_moptions *im6o;
736 	struct in6_multi_mship *imm, *nimm;
737 
738 	INP_INFO_RLOCK(pcbinfo);
739 	LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
740 		INP_WLOCK(in6p);
741 		im6o = in6p->in6p_moptions;
742 		if ((in6p->inp_vflag & INP_IPV6) &&
743 		    im6o) {
744 			/*
745 			 * Unselect the outgoing interface if it is being
746 			 * detached.
747 			 */
748 			if (im6o->im6o_multicast_ifp == ifp)
749 				im6o->im6o_multicast_ifp = NULL;
750 
751 			/*
752 			 * Drop multicast group membership if we joined
753 			 * through the interface being detached.
754 			 * XXX controversial - is it really legal for kernel
755 			 * to force this?
756 			 */
757 			for (imm = im6o->im6o_memberships.lh_first;
758 			     imm != NULL; imm = nimm) {
759 				nimm = imm->i6mm_chain.le_next;
760 				if (imm->i6mm_maddr->in6m_ifp == ifp) {
761 					LIST_REMOVE(imm, i6mm_chain);
762 					in6_delmulti(imm->i6mm_maddr);
763 					free(imm, M_IP6MADDR);
764 				}
765 			}
766 		}
767 		INP_WUNLOCK(in6p);
768 	}
769 	INP_INFO_RUNLOCK(pcbinfo);
770 }
771 
772 /*
773  * Check for alternatives when higher level complains
774  * about service problems.  For now, invalidate cached
775  * routing information.  If the route was created dynamically
776  * (by a redirect), time to try a default gateway again.
777  */
778 void
779 in6_losing(struct inpcb *in6p)
780 {
781 
782 	/*
783 	 * We don't store route pointers in the routing table anymore
784 	 */
785 	return;
786 }
787 
788 /*
789  * After a routing change, flush old routing
790  * and allocate a (hopefully) better one.
791  */
792 struct inpcb *
793 in6_rtchange(struct inpcb *inp, int errno)
794 {
795 	/*
796 	 * We don't store route pointers in the routing table anymore
797 	 */
798 	return inp;
799 }
800 
801 /*
802  * Lookup PCB in hash list.
803  */
804 struct inpcb *
805 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
806     u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, int wildcard,
807     struct ifnet *ifp)
808 {
809 	struct inpcbhead *head;
810 	struct inpcb *inp, *tmpinp;
811 	u_short fport = fport_arg, lport = lport_arg;
812 	int faith;
813 
814 	INP_INFO_LOCK_ASSERT(pcbinfo);
815 
816 	if (faithprefix_p != NULL)
817 		faith = (*faithprefix_p)(laddr);
818 	else
819 		faith = 0;
820 
821 	/*
822 	 * First look for an exact match.
823 	 */
824 	tmpinp = NULL;
825 	head = &pcbinfo->ipi_hashbase[
826 	    INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport,
827 	    pcbinfo->ipi_hashmask)];
828 	LIST_FOREACH(inp, head, inp_hash) {
829 		/* XXX inp locking */
830 		if ((inp->inp_vflag & INP_IPV6) == 0)
831 			continue;
832 		if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
833 		    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
834 		    inp->inp_fport == fport &&
835 		    inp->inp_lport == lport) {
836 			/*
837 			 * XXX We should be able to directly return
838 			 * the inp here, without any checks.
839 			 * Well unless both bound with SO_REUSEPORT?
840 			 */
841 			if (jailed(inp->inp_cred))
842 				return (inp);
843 			if (tmpinp == NULL)
844 				tmpinp = inp;
845 		}
846 	}
847 	if (tmpinp != NULL)
848 		return (tmpinp);
849 
850 	/*
851 	 * Then look for a wildcard match, if requested.
852 	 */
853 	if (wildcard == INPLOOKUP_WILDCARD) {
854 		struct inpcb *local_wild = NULL, *local_exact = NULL;
855 		struct inpcb *jail_wild = NULL;
856 		int injail;
857 
858 		/*
859 		 * Order of socket selection - we always prefer jails.
860 		 *      1. jailed, non-wild.
861 		 *      2. jailed, wild.
862 		 *      3. non-jailed, non-wild.
863 		 *      4. non-jailed, wild.
864 		 */
865 		head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
866 		    0, pcbinfo->ipi_hashmask)];
867 		LIST_FOREACH(inp, head, inp_hash) {
868 			/* XXX inp locking */
869 			if ((inp->inp_vflag & INP_IPV6) == 0)
870 				continue;
871 
872 			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
873 			    inp->inp_lport != lport) {
874 				continue;
875 			}
876 
877 			/* XXX inp locking */
878 			if (faith && (inp->inp_flags & INP_FAITH) == 0)
879 				continue;
880 
881 			injail = jailed(inp->inp_cred);
882 			if (injail) {
883 				if (prison_check_ip6(inp->inp_cred,
884 				    laddr) != 0)
885 					continue;
886 			} else {
887 				if (local_exact != NULL)
888 					continue;
889 			}
890 
891 			if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
892 				if (injail)
893 					return (inp);
894 				else
895 					local_exact = inp;
896 			} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
897 				if (injail)
898 					jail_wild = inp;
899 				else
900 					local_wild = inp;
901 			}
902 		} /* LIST_FOREACH */
903 
904 		if (jail_wild != NULL)
905 			return (jail_wild);
906 		if (local_exact != NULL)
907 			return (local_exact);
908 		if (local_wild != NULL)
909 			return (local_wild);
910 	} /* if (wildcard == INPLOOKUP_WILDCARD) */
911 
912 	/*
913 	 * Not found.
914 	 */
915 	return (NULL);
916 }
917 
918 void
919 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
920 {
921 	struct ip6_hdr *ip;
922 
923 	ip = mtod(m, struct ip6_hdr *);
924 	bzero(sin6, sizeof(*sin6));
925 	sin6->sin6_len = sizeof(*sin6);
926 	sin6->sin6_family = AF_INET6;
927 	sin6->sin6_addr = ip->ip6_src;
928 
929 	(void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
930 
931 	return;
932 }
933