1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Copyright (c) 2010-2011 Juniper Networks, Inc.
6 * All rights reserved.
7 *
8 * Portions of this software were developed by Robert N. M. Watson under
9 * contract to Juniper Networks, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the project nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *	$KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $
36 */
37
38/*-
39 * Copyright (c) 1982, 1986, 1991, 1993
40 *	The Regents of the University of California.  All rights reserved.
41 *
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
44 * are met:
45 * 1. Redistributions of source code must retain the above copyright
46 *    notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 *    notice, this list of conditions and the following disclaimer in the
49 *    documentation and/or other materials provided with the distribution.
50 * 3. Neither the name of the University nor the names of its contributors
51 *    may be used to endorse or promote products derived from this software
52 *    without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * SUCH DAMAGE.
65 *
66 *	@(#)in_pcb.c	8.2 (Berkeley) 1/4/94
67 */
68
69#include <sys/cdefs.h>
70__FBSDID("$FreeBSD$");
71
72#include "opt_inet.h"
73#include "opt_inet6.h"
74#include "opt_ipsec.h"
75#include "opt_pcbgroup.h"
76#include "opt_rss.h"
77
78#include <sys/param.h>
79#include <sys/systm.h>
80#include <sys/malloc.h>
81#include <sys/mbuf.h>
82#include <sys/domain.h>
83#include <sys/protosw.h>
84#include <sys/socket.h>
85#include <sys/socketvar.h>
86#include <sys/sockio.h>
87#include <sys/errno.h>
88#include <sys/time.h>
89#include <sys/priv.h>
90#include <sys/proc.h>
91#include <sys/jail.h>
92
93#include <vm/uma.h>
94
95#include <net/if.h>
96#include <net/if_var.h>
97#include <net/if_llatbl.h>
98#include <net/if_types.h>
99#include <net/route.h>
100
101#include <netinet/in.h>
102#include <netinet/in_var.h>
103#include <netinet/in_systm.h>
104#include <netinet/tcp_var.h>
105#include <netinet/ip6.h>
106#include <netinet/ip_var.h>
107
108#include <netinet6/ip6_var.h>
109#include <netinet6/nd6.h>
110#include <netinet/in_pcb.h>
111#include <netinet6/in6_pcb.h>
112#include <netinet6/scope6_var.h>
113
114static struct inpcb *in6_pcblookup_hash_locked(struct inpcbinfo *,
115    struct in6_addr *, u_int, struct in6_addr *, u_int, int, struct ifnet *);
116
117int
118in6_pcbbind(struct inpcb *inp, struct sockaddr *nam,
119    struct ucred *cred)
120{
121	struct socket *so = inp->inp_socket;
122	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
123	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
124	u_short	lport = 0;
125	int error, lookupflags = 0;
126	int reuseport = (so->so_options & SO_REUSEPORT);
127
128	/*
129	 * XXX: Maybe we could let SO_REUSEPORT_LB set SO_REUSEPORT bit here
130	 * so that we don't have to add to the (already messy) code below.
131	 */
132	int reuseport_lb = (so->so_options & SO_REUSEPORT_LB);
133
134	INP_WLOCK_ASSERT(inp);
135	INP_HASH_WLOCK_ASSERT(pcbinfo);
136
137	if (CK_STAILQ_EMPTY(&V_in6_ifaddrhead))	/* 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|SO_REUSEPORT_LB)) == 0)
142		lookupflags = INPLOOKUP_WILDCARD;
143	if (nam == NULL) {
144		if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
145		    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
146			return (error);
147	} else {
148		sin6 = (struct sockaddr_in6 *)nam;
149		if (nam->sa_len != sizeof(*sin6))
150			return (EINVAL);
151		/*
152		 * family check.
153		 */
154		if (nam->sa_family != AF_INET6)
155			return (EAFNOSUPPORT);
156
157		if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
158			return(error);
159
160		if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
161		    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
162			return (error);
163
164		lport = sin6->sin6_port;
165		if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
166			/*
167			 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
168			 * allow compepte duplication of binding if
169			 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
170			 * and a multicast address is bound on both
171			 * new and duplicated sockets.
172			 */
173			if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
174				reuseport = SO_REUSEADDR|SO_REUSEPORT;
175			/*
176			 * XXX: How to deal with SO_REUSEPORT_LB here?
177			 * Treat same as SO_REUSEPORT for now.
178			 */
179			if ((so->so_options &
180			    (SO_REUSEADDR|SO_REUSEPORT_LB)) != 0)
181				reuseport_lb = SO_REUSEADDR|SO_REUSEPORT_LB;
182		} else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
183			struct epoch_tracker et;
184			struct ifaddr *ifa;
185
186			sin6->sin6_port = 0;		/* yech... */
187			NET_EPOCH_ENTER(et);
188			if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
189			    NULL &&
190			    (inp->inp_flags & INP_BINDANY) == 0) {
191				NET_EPOCH_EXIT(et);
192				return (EADDRNOTAVAIL);
193			}
194
195			/*
196			 * XXX: bind to an anycast address might accidentally
197			 * cause sending a packet with anycast source address.
198			 * We should allow to bind to a deprecated address, since
199			 * the application dares to use it.
200			 */
201			if (ifa != NULL &&
202			    ((struct in6_ifaddr *)ifa)->ia6_flags &
203			    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
204				NET_EPOCH_EXIT(et);
205				return (EADDRNOTAVAIL);
206			}
207			NET_EPOCH_EXIT(et);
208		}
209		if (lport) {
210			struct inpcb *t;
211			struct tcptw *tw;
212
213			/* GROSS */
214			if (ntohs(lport) <= V_ipport_reservedhigh &&
215			    ntohs(lport) >= V_ipport_reservedlow &&
216			    priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT))
217				return (EACCES);
218			if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
219			    priv_check_cred(inp->inp_cred, PRIV_NETINET_REUSEPORT) != 0) {
220				t = in6_pcblookup_local(pcbinfo,
221				    &sin6->sin6_addr, lport,
222				    INPLOOKUP_WILDCARD, cred);
223				if (t &&
224				    ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
225				    ((t->inp_flags & INP_TIMEWAIT) == 0) &&
226				    (so->so_type != SOCK_STREAM ||
227				     IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
228				    (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
229				     !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
230				     (t->inp_flags2 & INP_REUSEPORT) ||
231				     (t->inp_flags2 & INP_REUSEPORT_LB) == 0) &&
232				    (inp->inp_cred->cr_uid !=
233				     t->inp_cred->cr_uid))
234					return (EADDRINUSE);
235
236				/*
237				 * If the socket is a BINDMULTI socket, then
238				 * the credentials need to match and the
239				 * original socket also has to have been bound
240				 * with BINDMULTI.
241				 */
242				if (t && (! in_pcbbind_check_bindmulti(inp, t)))
243					return (EADDRINUSE);
244
245#ifdef INET
246				if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
247				    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
248					struct sockaddr_in sin;
249
250					in6_sin6_2_sin(&sin, sin6);
251					t = in_pcblookup_local(pcbinfo,
252					    sin.sin_addr, lport,
253					    INPLOOKUP_WILDCARD, cred);
254					if (t &&
255					    ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
256					    ((t->inp_flags &
257					      INP_TIMEWAIT) == 0) &&
258					    (so->so_type != SOCK_STREAM ||
259					     ntohl(t->inp_faddr.s_addr) ==
260					      INADDR_ANY) &&
261					    (inp->inp_cred->cr_uid !=
262					     t->inp_cred->cr_uid))
263						return (EADDRINUSE);
264
265					if (t && (! in_pcbbind_check_bindmulti(inp, t)))
266						return (EADDRINUSE);
267				}
268#endif
269			}
270			t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
271			    lport, lookupflags, cred);
272			if (t && (t->inp_flags & INP_TIMEWAIT)) {
273				/*
274				 * XXXRW: If an incpb has had its timewait
275				 * state recycled, we treat the address as
276				 * being in use (for now).  This is better
277				 * than a panic, but not desirable.
278				 */
279				tw = intotw(t);
280				if (tw == NULL ||
281				    ((reuseport & tw->tw_so_options) == 0 &&
282					 (reuseport_lb & tw->tw_so_options) == 0))
283					return (EADDRINUSE);
284			} else if (t && (reuseport & inp_so_options(t)) == 0 &&
285					   (reuseport_lb & inp_so_options(t)) == 0) {
286				return (EADDRINUSE);
287			}
288#ifdef INET
289			if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
290			    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
291				struct sockaddr_in sin;
292
293				in6_sin6_2_sin(&sin, sin6);
294				t = in_pcblookup_local(pcbinfo, sin.sin_addr,
295				   lport, lookupflags, cred);
296				if (t && t->inp_flags & INP_TIMEWAIT) {
297					tw = intotw(t);
298					if (tw == NULL)
299						return (EADDRINUSE);
300					if ((reuseport & tw->tw_so_options) == 0
301					    && (reuseport_lb & tw->tw_so_options) == 0
302					    && (ntohl(t->inp_laddr.s_addr) !=
303					        INADDR_ANY || ((inp->inp_vflag &
304					                INP_IPV6PROTO) ==
305					            (t->inp_vflag & INP_IPV6PROTO))))
306						return (EADDRINUSE);
307				} else if (t &&
308				    (reuseport & inp_so_options(t)) == 0 &&
309				    (reuseport_lb & inp_so_options(t)) == 0 &&
310				    (ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
311				        (t->inp_vflag & INP_IPV6PROTO) != 0)) {
312					return (EADDRINUSE);
313				}
314			}
315#endif
316		}
317		inp->in6p_laddr = sin6->sin6_addr;
318	}
319	if (lport == 0) {
320		if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
321			/* Undo an address bind that may have occurred. */
322			inp->in6p_laddr = in6addr_any;
323			return (error);
324		}
325	} else {
326		inp->inp_lport = lport;
327		if (in_pcbinshash(inp) != 0) {
328			inp->in6p_laddr = in6addr_any;
329			inp->inp_lport = 0;
330			return (EAGAIN);
331		}
332	}
333	return (0);
334}
335
336/*
337 *   Transform old in6_pcbconnect() into an inner subroutine for new
338 *   in6_pcbconnect(): Do some validity-checking on the remote
339 *   address (in mbuf 'nam') and then determine local host address
340 *   (i.e., which interface) to use to access that remote host.
341 *
342 *   This preserves definition of in6_pcbconnect(), while supporting a
343 *   slightly different version for T/TCP.  (This is more than
344 *   a bit of a kludge, but cleaning up the internal interfaces would
345 *   have forced minor changes in every protocol).
346 */
347static int
348in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
349    struct in6_addr *plocal_addr6)
350{
351	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
352	int error = 0;
353	int scope_ambiguous = 0;
354	struct in6_addr in6a;
355
356	INP_WLOCK_ASSERT(inp);
357	INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);	/* XXXRW: why? */
358
359	if (nam->sa_len != sizeof (*sin6))
360		return (EINVAL);
361	if (sin6->sin6_family != AF_INET6)
362		return (EAFNOSUPPORT);
363	if (sin6->sin6_port == 0)
364		return (EADDRNOTAVAIL);
365
366	if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
367		scope_ambiguous = 1;
368	if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
369		return(error);
370
371	if (!CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) {
372		/*
373		 * If the destination address is UNSPECIFIED addr,
374		 * use the loopback addr, e.g ::1.
375		 */
376		if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
377			sin6->sin6_addr = in6addr_loopback;
378	}
379	if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
380		return (error);
381
382	error = in6_selectsrc_socket(sin6, inp->in6p_outputopts,
383	    inp, inp->inp_cred, scope_ambiguous, &in6a, NULL);
384	if (error)
385		return (error);
386
387	/*
388	 * Do not update this earlier, in case we return with an error.
389	 *
390	 * XXX: this in6_selectsrc_socket result might replace the bound local
391	 * address with the address specified by setsockopt(IPV6_PKTINFO).
392	 * Is it the intended behavior?
393	 */
394	*plocal_addr6 = in6a;
395
396	/*
397	 * Don't do pcblookup call here; return interface in
398	 * plocal_addr6
399	 * and exit to caller, that will do the lookup.
400	 */
401
402	return (0);
403}
404
405/*
406 * Outer subroutine:
407 * Connect from a socket to a specified address.
408 * Both address and port must be specified in argument sin.
409 * If don't have a local address for this socket yet,
410 * then pick one.
411 */
412int
413in6_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
414    struct ucred *cred, struct mbuf *m, bool rehash)
415{
416	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
417	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
418	struct in6_addr addr6;
419	int error;
420
421	INP_WLOCK_ASSERT(inp);
422	INP_HASH_WLOCK_ASSERT(pcbinfo);
423
424	/*
425	 * Call inner routine, to assign local interface address.
426	 * in6_pcbladdr() may automatically fill in sin6_scope_id.
427	 */
428	if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
429		return (error);
430
431	if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
432			       sin6->sin6_port,
433			      IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
434			      ? &addr6 : &inp->in6p_laddr,
435			      inp->inp_lport, 0, NULL) != NULL) {
436		return (EADDRINUSE);
437	}
438	if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
439		if (inp->inp_lport == 0) {
440			KASSERT(rehash == true,
441			    ("Rehashing required for unbound inps"));
442			error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
443			if (error)
444				return (error);
445		}
446		inp->in6p_laddr = addr6;
447	}
448	inp->in6p_faddr = sin6->sin6_addr;
449	inp->inp_fport = sin6->sin6_port;
450	/* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
451	inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
452	if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
453		inp->inp_flow |=
454		    (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
455
456	if (rehash) {
457		in_pcbrehash_mbuf(inp, m);
458	} else {
459		in_pcbinshash_mbuf(inp, m);
460	}
461
462	return (0);
463}
464
465int
466in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
467{
468
469	return (in6_pcbconnect_mbuf(inp, nam, cred, NULL, true));
470}
471
472void
473in6_pcbdisconnect(struct inpcb *inp)
474{
475
476	INP_WLOCK_ASSERT(inp);
477	INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
478
479	bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
480	inp->inp_fport = 0;
481	/* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
482	inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
483	in_pcbrehash(inp);
484}
485
486struct sockaddr *
487in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
488{
489	struct sockaddr_in6 *sin6;
490
491	sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
492	bzero(sin6, sizeof *sin6);
493	sin6->sin6_family = AF_INET6;
494	sin6->sin6_len = sizeof(*sin6);
495	sin6->sin6_port = port;
496	sin6->sin6_addr = *addr_p;
497	(void)sa6_recoverscope(sin6); /* XXX: should catch errors */
498
499	return (struct sockaddr *)sin6;
500}
501
502struct sockaddr *
503in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
504{
505	struct sockaddr_in sin;
506	struct sockaddr_in6 *sin6_p;
507
508	bzero(&sin, sizeof sin);
509	sin.sin_family = AF_INET;
510	sin.sin_len = sizeof(sin);
511	sin.sin_port = port;
512	sin.sin_addr = *addr_p;
513
514	sin6_p = malloc(sizeof *sin6_p, M_SONAME,
515		M_WAITOK);
516	in6_sin_2_v4mapsin6(&sin, sin6_p);
517
518	return (struct sockaddr *)sin6_p;
519}
520
521int
522in6_getsockaddr(struct socket *so, struct sockaddr **nam)
523{
524	struct inpcb *inp;
525	struct in6_addr addr;
526	in_port_t port;
527
528	inp = sotoinpcb(so);
529	KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
530
531	INP_RLOCK(inp);
532	port = inp->inp_lport;
533	addr = inp->in6p_laddr;
534	INP_RUNLOCK(inp);
535
536	*nam = in6_sockaddr(port, &addr);
537	return 0;
538}
539
540int
541in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
542{
543	struct inpcb *inp;
544	struct in6_addr addr;
545	in_port_t port;
546
547	inp = sotoinpcb(so);
548	KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
549
550	INP_RLOCK(inp);
551	port = inp->inp_fport;
552	addr = inp->in6p_faddr;
553	INP_RUNLOCK(inp);
554
555	*nam = in6_sockaddr(port, &addr);
556	return 0;
557}
558
559int
560in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
561{
562	struct	inpcb *inp;
563	int	error;
564
565	inp = sotoinpcb(so);
566	KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
567
568#ifdef INET
569	if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
570		error = in_getsockaddr(so, nam);
571		if (error == 0)
572			in6_sin_2_v4mapsin6_in_sock(nam);
573	} else
574#endif
575	{
576		/* scope issues will be handled in in6_getsockaddr(). */
577		error = in6_getsockaddr(so, nam);
578	}
579
580	return error;
581}
582
583int
584in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
585{
586	struct	inpcb *inp;
587	int	error;
588
589	inp = sotoinpcb(so);
590	KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
591
592#ifdef INET
593	if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
594		error = in_getpeeraddr(so, nam);
595		if (error == 0)
596			in6_sin_2_v4mapsin6_in_sock(nam);
597	} else
598#endif
599	/* scope issues will be handled in in6_getpeeraddr(). */
600	error = in6_getpeeraddr(so, nam);
601
602	return error;
603}
604
605/*
606 * Pass some notification to all connections of a protocol
607 * associated with address dst.  The local address and/or port numbers
608 * may be specified to limit the search.  The "usual action" will be
609 * taken, depending on the ctlinput cmd.  The caller must filter any
610 * cmds that are uninteresting (e.g., no error in the map).
611 * Call the protocol specific routine (if any) to report
612 * any errors for each matching socket.
613 */
614void
615in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
616    u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
617    int cmd, void *cmdarg,
618    struct inpcb *(*notify)(struct inpcb *, int))
619{
620	struct inpcb *inp, *inp_temp;
621	struct sockaddr_in6 sa6_src, *sa6_dst;
622	u_short	fport = fport_arg, lport = lport_arg;
623	u_int32_t flowinfo;
624	int errno;
625
626	if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
627		return;
628
629	sa6_dst = (struct sockaddr_in6 *)dst;
630	if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
631		return;
632
633	/*
634	 * note that src can be NULL when we get notify by local fragmentation.
635	 */
636	sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
637	flowinfo = sa6_src.sin6_flowinfo;
638
639	/*
640	 * Redirects go to all references to the destination,
641	 * and use in6_rtchange to invalidate the route cache.
642	 * Dead host indications: also use in6_rtchange to invalidate
643	 * the cache, and deliver the error to all the sockets.
644	 * Otherwise, if we have knowledge of the local port and address,
645	 * deliver only to that socket.
646	 */
647	if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
648		fport = 0;
649		lport = 0;
650		bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
651
652		if (cmd != PRC_HOSTDEAD)
653			notify = in6_rtchange;
654	}
655	errno = inet6ctlerrmap[cmd];
656	INP_INFO_WLOCK(pcbinfo);
657	CK_LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
658		INP_WLOCK(inp);
659		if ((inp->inp_vflag & INP_IPV6) == 0) {
660			INP_WUNLOCK(inp);
661			continue;
662		}
663
664		/*
665		 * If the error designates a new path MTU for a destination
666		 * and the application (associated with this socket) wanted to
667		 * know the value, notify.
668		 * XXX: should we avoid to notify the value to TCP sockets?
669		 */
670		if (cmd == PRC_MSGSIZE && cmdarg != NULL)
671			ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
672					*(u_int32_t *)cmdarg);
673
674		/*
675		 * Detect if we should notify the error. If no source and
676		 * destination ports are specifed, but non-zero flowinfo and
677		 * local address match, notify the error. This is the case
678		 * when the error is delivered with an encrypted buffer
679		 * by ESP. Otherwise, just compare addresses and ports
680		 * as usual.
681		 */
682		if (lport == 0 && fport == 0 && flowinfo &&
683		    inp->inp_socket != NULL &&
684		    flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
685		    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
686			goto do_notify;
687		else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
688					     &sa6_dst->sin6_addr) ||
689			 inp->inp_socket == 0 ||
690			 (lport && inp->inp_lport != lport) ||
691			 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
692			  !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
693					      &sa6_src.sin6_addr)) ||
694			 (fport && inp->inp_fport != fport)) {
695			INP_WUNLOCK(inp);
696			continue;
697		}
698
699	  do_notify:
700		if (notify) {
701			if ((*notify)(inp, errno))
702				INP_WUNLOCK(inp);
703		} else
704			INP_WUNLOCK(inp);
705	}
706	INP_INFO_WUNLOCK(pcbinfo);
707}
708
709/*
710 * Lookup a PCB based on the local address and port.  Caller must hold the
711 * hash lock.  No inpcb locks or references are acquired.
712 */
713struct inpcb *
714in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
715    u_short lport, int lookupflags, struct ucred *cred)
716{
717	struct inpcb *inp;
718	int matchwild = 3, wildcard;
719
720	KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
721	    ("%s: invalid lookup flags %d", __func__, lookupflags));
722
723	INP_HASH_LOCK_ASSERT(pcbinfo);
724
725	if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
726		struct inpcbhead *head;
727		/*
728		 * Look for an unconnected (wildcard foreign addr) PCB that
729		 * matches the local address and port we're looking for.
730		 */
731		head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
732		    INP6_PCBHASHKEY(&in6addr_any), lport, 0,
733		    pcbinfo->ipi_hashmask)];
734		CK_LIST_FOREACH(inp, head, inp_hash) {
735			/* XXX inp locking */
736			if ((inp->inp_vflag & INP_IPV6) == 0)
737				continue;
738			if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
739			    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
740			    inp->inp_lport == lport) {
741				/* Found. */
742				if (cred == NULL ||
743				    prison_equal_ip6(cred->cr_prison,
744					inp->inp_cred->cr_prison))
745					return (inp);
746			}
747		}
748		/*
749		 * Not found.
750		 */
751		return (NULL);
752	} else {
753		struct inpcbporthead *porthash;
754		struct inpcbport *phd;
755		struct inpcb *match = NULL;
756		/*
757		 * Best fit PCB lookup.
758		 *
759		 * First see if this local port is in use by looking on the
760		 * port hash list.
761		 */
762		porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
763		    pcbinfo->ipi_porthashmask)];
764		CK_LIST_FOREACH(phd, porthash, phd_hash) {
765			if (phd->phd_port == lport)
766				break;
767		}
768		if (phd != NULL) {
769			/*
770			 * Port is in use by one or more PCBs. Look for best
771			 * fit.
772			 */
773			CK_LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
774				wildcard = 0;
775				if (cred != NULL &&
776				    !prison_equal_ip6(cred->cr_prison,
777					inp->inp_cred->cr_prison))
778					continue;
779				/* XXX inp locking */
780				if ((inp->inp_vflag & INP_IPV6) == 0)
781					continue;
782				if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
783					wildcard++;
784				if (!IN6_IS_ADDR_UNSPECIFIED(
785					&inp->in6p_laddr)) {
786					if (IN6_IS_ADDR_UNSPECIFIED(laddr))
787						wildcard++;
788					else if (!IN6_ARE_ADDR_EQUAL(
789					    &inp->in6p_laddr, laddr))
790						continue;
791				} else {
792					if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
793						wildcard++;
794				}
795				if (wildcard < matchwild) {
796					match = inp;
797					matchwild = wildcard;
798					if (matchwild == 0)
799						break;
800				}
801			}
802		}
803		return (match);
804	}
805}
806
807void
808in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
809{
810	struct inpcb *inp;
811	struct in6_multi *inm;
812	struct in6_mfilter *imf;
813	struct ip6_moptions *im6o;
814
815	INP_INFO_WLOCK(pcbinfo);
816	CK_LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
817		INP_WLOCK(inp);
818		if (__predict_false(inp->inp_flags2 & INP_FREED)) {
819			INP_WUNLOCK(inp);
820			continue;
821		}
822		im6o = inp->in6p_moptions;
823		if ((inp->inp_vflag & INP_IPV6) && im6o != NULL) {
824			/*
825			 * Unselect the outgoing ifp for multicast if it
826			 * is being detached.
827			 */
828			if (im6o->im6o_multicast_ifp == ifp)
829				im6o->im6o_multicast_ifp = NULL;
830			/*
831			 * Drop multicast group membership if we joined
832			 * through the interface being detached.
833			 */
834restart:
835			IP6_MFILTER_FOREACH(imf, &im6o->im6o_head) {
836				if ((inm = imf->im6f_in6m) == NULL)
837					continue;
838				if (inm->in6m_ifp != ifp)
839					continue;
840				ip6_mfilter_remove(&im6o->im6o_head, imf);
841				IN6_MULTI_LOCK_ASSERT();
842				in6_leavegroup_locked(inm, NULL);
843				ip6_mfilter_free(imf);
844				goto restart;
845			}
846		}
847		INP_WUNLOCK(inp);
848	}
849	INP_INFO_WUNLOCK(pcbinfo);
850}
851
852/*
853 * Check for alternatives when higher level complains
854 * about service problems.  For now, invalidate cached
855 * routing information.  If the route was created dynamically
856 * (by a redirect), time to try a default gateway again.
857 */
858void
859in6_losing(struct inpcb *inp)
860{
861
862	RO_INVALIDATE_CACHE(&inp->inp_route6);
863}
864
865/*
866 * After a routing change, flush old routing
867 * and allocate a (hopefully) better one.
868 */
869struct inpcb *
870in6_rtchange(struct inpcb *inp, int errno __unused)
871{
872
873	RO_INVALIDATE_CACHE(&inp->inp_route6);
874	return inp;
875}
876
877static struct inpcb *
878in6_pcblookup_lbgroup(const struct inpcbinfo *pcbinfo,
879    const struct in6_addr *laddr, uint16_t lport, const struct in6_addr *faddr,
880    uint16_t fport, int lookupflags)
881{
882	struct inpcb *local_wild;
883	const struct inpcblbgrouphead *hdr;
884	struct inpcblbgroup *grp;
885	uint32_t idx;
886
887	INP_HASH_LOCK_ASSERT(pcbinfo);
888
889	hdr = &pcbinfo->ipi_lbgrouphashbase[
890	    INP_PCBPORTHASH(lport, pcbinfo->ipi_lbgrouphashmask)];
891
892	/*
893	 * Order of socket selection:
894	 * 1. non-wild.
895	 * 2. wild (if lookupflags contains INPLOOKUP_WILDCARD).
896	 *
897	 * NOTE:
898	 * - Load balanced group does not contain jailed sockets.
899	 * - Load balanced does not contain IPv4 mapped INET6 wild sockets.
900	 */
901	local_wild = NULL;
902	CK_LIST_FOREACH(grp, hdr, il_list) {
903#ifdef INET
904		if (!(grp->il_vflag & INP_IPV6))
905			continue;
906#endif
907		if (grp->il_lport != lport)
908			continue;
909
910		idx = INP_PCBLBGROUP_PKTHASH(INP6_PCBHASHKEY(faddr), lport,
911		    fport) % grp->il_inpcnt;
912		if (IN6_ARE_ADDR_EQUAL(&grp->il6_laddr, laddr))
913			return (grp->il_inp[idx]);
914		if (IN6_IS_ADDR_UNSPECIFIED(&grp->il6_laddr) &&
915		    (lookupflags & INPLOOKUP_WILDCARD) != 0)
916			local_wild = grp->il_inp[idx];
917	}
918	return (local_wild);
919}
920
921#ifdef PCBGROUP
922/*
923 * Lookup PCB in hash list, using pcbgroup tables.
924 */
925static struct inpcb *
926in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
927    struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr,
928    u_int lport_arg, int lookupflags, struct ifnet *ifp)
929{
930	struct inpcbhead *head;
931	struct inpcb *inp, *tmpinp;
932	u_short fport = fport_arg, lport = lport_arg;
933	bool locked;
934
935	/*
936	 * First look for an exact match.
937	 */
938	tmpinp = NULL;
939	INP_GROUP_LOCK(pcbgroup);
940	head = &pcbgroup->ipg_hashbase[INP_PCBHASH(
941	    INP6_PCBHASHKEY(faddr), lport, fport, pcbgroup->ipg_hashmask)];
942	CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
943		/* XXX inp locking */
944		if ((inp->inp_vflag & INP_IPV6) == 0)
945			continue;
946		if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
947		    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
948		    inp->inp_fport == fport &&
949		    inp->inp_lport == lport) {
950			/*
951			 * XXX We should be able to directly return
952			 * the inp here, without any checks.
953			 * Well unless both bound with SO_REUSEPORT?
954			 */
955			if (prison_flag(inp->inp_cred, PR_IP6))
956				goto found;
957			if (tmpinp == NULL)
958				tmpinp = inp;
959		}
960	}
961	if (tmpinp != NULL) {
962		inp = tmpinp;
963		goto found;
964	}
965
966	/*
967	 * Then look for a wildcard match in the pcbgroup.
968	 */
969	if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
970		struct inpcb *local_wild = NULL, *local_exact = NULL;
971		struct inpcb *jail_wild = NULL;
972		int injail;
973
974		/*
975		 * Order of socket selection - we always prefer jails.
976		 *      1. jailed, non-wild.
977		 *      2. jailed, wild.
978		 *      3. non-jailed, non-wild.
979		 *      4. non-jailed, wild.
980		 */
981		head = &pcbgroup->ipg_hashbase[
982		    INP_PCBHASH(INADDR_ANY, lport, 0, pcbgroup->ipg_hashmask)];
983		CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
984			/* XXX inp locking */
985			if ((inp->inp_vflag & INP_IPV6) == 0)
986				continue;
987
988			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
989			    inp->inp_lport != lport) {
990				continue;
991			}
992
993			injail = prison_flag(inp->inp_cred, PR_IP6);
994			if (injail) {
995				if (prison_check_ip6(inp->inp_cred,
996				    laddr) != 0)
997					continue;
998			} else {
999				if (local_exact != NULL)
1000					continue;
1001			}
1002
1003			if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1004				if (injail)
1005					goto found;
1006				else
1007					local_exact = inp;
1008			} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1009				if (injail)
1010					jail_wild = inp;
1011				else
1012					local_wild = inp;
1013			}
1014		} /* LIST_FOREACH */
1015
1016		inp = jail_wild;
1017		if (inp == NULL)
1018			inp = jail_wild;
1019		if (inp == NULL)
1020			inp = local_exact;
1021		if (inp == NULL)
1022			inp = local_wild;
1023		if (inp != NULL)
1024			goto found;
1025	}
1026
1027	/*
1028	 * Then look for a wildcard match, if requested.
1029	 */
1030	if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1031		struct inpcb *local_wild = NULL, *local_exact = NULL;
1032		struct inpcb *jail_wild = NULL;
1033		int injail;
1034
1035		/*
1036		 * Order of socket selection - we always prefer jails.
1037		 *      1. jailed, non-wild.
1038		 *      2. jailed, wild.
1039		 *      3. non-jailed, non-wild.
1040		 *      4. non-jailed, wild.
1041		 */
1042		head = &pcbinfo->ipi_wildbase[INP_PCBHASH(
1043		    INP6_PCBHASHKEY(&in6addr_any), lport, 0,
1044		    pcbinfo->ipi_wildmask)];
1045		CK_LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
1046			/* XXX inp locking */
1047			if ((inp->inp_vflag & INP_IPV6) == 0)
1048				continue;
1049
1050			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1051			    inp->inp_lport != lport) {
1052				continue;
1053			}
1054
1055			injail = prison_flag(inp->inp_cred, PR_IP6);
1056			if (injail) {
1057				if (prison_check_ip6(inp->inp_cred,
1058				    laddr) != 0)
1059					continue;
1060			} else {
1061				if (local_exact != NULL)
1062					continue;
1063			}
1064
1065			if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1066				if (injail)
1067					goto found;
1068				else
1069					local_exact = inp;
1070			} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1071				if (injail)
1072					jail_wild = inp;
1073				else
1074					local_wild = inp;
1075			}
1076		} /* LIST_FOREACH */
1077
1078		inp = jail_wild;
1079		if (inp == NULL)
1080			inp = jail_wild;
1081		if (inp == NULL)
1082			inp = local_exact;
1083		if (inp == NULL)
1084			inp = local_wild;
1085		if (inp != NULL)
1086			goto found;
1087	} /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1088	INP_GROUP_UNLOCK(pcbgroup);
1089	return (NULL);
1090
1091found:
1092	if (lookupflags & INPLOOKUP_WLOCKPCB)
1093		locked = INP_TRY_WLOCK(inp);
1094	else if (lookupflags & INPLOOKUP_RLOCKPCB)
1095		locked = INP_TRY_RLOCK(inp);
1096	else
1097		panic("%s: locking buf", __func__);
1098	if (!locked)
1099		in_pcbref(inp);
1100	INP_GROUP_UNLOCK(pcbgroup);
1101	if (!locked) {
1102		if (lookupflags & INPLOOKUP_WLOCKPCB) {
1103			INP_WLOCK(inp);
1104			if (in_pcbrele_wlocked(inp))
1105				return (NULL);
1106		} else {
1107			INP_RLOCK(inp);
1108			if (in_pcbrele_rlocked(inp))
1109				return (NULL);
1110		}
1111	}
1112#ifdef INVARIANTS
1113	if (lookupflags & INPLOOKUP_WLOCKPCB)
1114		INP_WLOCK_ASSERT(inp);
1115	else
1116		INP_RLOCK_ASSERT(inp);
1117#endif
1118	return (inp);
1119}
1120#endif /* PCBGROUP */
1121
1122/*
1123 * Lookup PCB in hash list.
1124 */
1125static struct inpcb *
1126in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1127    u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1128    int lookupflags, struct ifnet *ifp)
1129{
1130	struct inpcbhead *head;
1131	struct inpcb *inp, *tmpinp;
1132	u_short fport = fport_arg, lport = lport_arg;
1133
1134	KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1135	    ("%s: invalid lookup flags %d", __func__, lookupflags));
1136
1137	INP_HASH_LOCK_ASSERT(pcbinfo);
1138
1139	/*
1140	 * First look for an exact match.
1141	 */
1142	tmpinp = NULL;
1143	head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
1144	    INP6_PCBHASHKEY(faddr), lport, fport, pcbinfo->ipi_hashmask)];
1145	CK_LIST_FOREACH(inp, head, inp_hash) {
1146		/* XXX inp locking */
1147		if ((inp->inp_vflag & INP_IPV6) == 0)
1148			continue;
1149		if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1150		    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1151		    inp->inp_fport == fport &&
1152		    inp->inp_lport == lport) {
1153			/*
1154			 * XXX We should be able to directly return
1155			 * the inp here, without any checks.
1156			 * Well unless both bound with SO_REUSEPORT?
1157			 */
1158			if (prison_flag(inp->inp_cred, PR_IP6))
1159				return (inp);
1160			if (tmpinp == NULL)
1161				tmpinp = inp;
1162		}
1163	}
1164	if (tmpinp != NULL)
1165		return (tmpinp);
1166
1167	/*
1168	 * Then look in lb group (for wildcard match).
1169	 */
1170	if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1171		inp = in6_pcblookup_lbgroup(pcbinfo, laddr, lport, faddr,
1172		    fport, lookupflags);
1173		if (inp != NULL)
1174			return (inp);
1175	}
1176
1177	/*
1178	 * Then look for a wildcard match, if requested.
1179	 */
1180	if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1181		struct inpcb *local_wild = NULL, *local_exact = NULL;
1182		struct inpcb *jail_wild = NULL;
1183		int injail;
1184
1185		/*
1186		 * Order of socket selection - we always prefer jails.
1187		 *      1. jailed, non-wild.
1188		 *      2. jailed, wild.
1189		 *      3. non-jailed, non-wild.
1190		 *      4. non-jailed, wild.
1191		 */
1192		head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
1193		    INP6_PCBHASHKEY(&in6addr_any), lport, 0,
1194		    pcbinfo->ipi_hashmask)];
1195		CK_LIST_FOREACH(inp, head, inp_hash) {
1196			/* XXX inp locking */
1197			if ((inp->inp_vflag & INP_IPV6) == 0)
1198				continue;
1199
1200			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1201			    inp->inp_lport != lport) {
1202				continue;
1203			}
1204
1205			injail = prison_flag(inp->inp_cred, PR_IP6);
1206			if (injail) {
1207				if (prison_check_ip6(inp->inp_cred,
1208				    laddr) != 0)
1209					continue;
1210			} else {
1211				if (local_exact != NULL)
1212					continue;
1213			}
1214
1215			if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1216				if (injail)
1217					return (inp);
1218				else
1219					local_exact = inp;
1220			} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1221				if (injail)
1222					jail_wild = inp;
1223				else
1224					local_wild = inp;
1225			}
1226		} /* LIST_FOREACH */
1227
1228		if (jail_wild != NULL)
1229			return (jail_wild);
1230		if (local_exact != NULL)
1231			return (local_exact);
1232		if (local_wild != NULL)
1233			return (local_wild);
1234	} /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1235
1236	/*
1237	 * Not found.
1238	 */
1239	return (NULL);
1240}
1241
1242/*
1243 * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1244 * hash list lock, and will return the inpcb locked (i.e., requires
1245 * INPLOOKUP_LOCKPCB).
1246 */
1247static struct inpcb *
1248in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1249    u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1250    struct ifnet *ifp)
1251{
1252	struct inpcb *inp;
1253
1254	inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1255	    (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1256	if (inp != NULL) {
1257		if (lookupflags & INPLOOKUP_WLOCKPCB) {
1258			INP_WLOCK(inp);
1259			if (__predict_false(inp->inp_flags2 & INP_FREED)) {
1260				INP_WUNLOCK(inp);
1261				inp = NULL;
1262			}
1263		} else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1264			INP_RLOCK(inp);
1265			if (__predict_false(inp->inp_flags2 & INP_FREED)) {
1266				INP_RUNLOCK(inp);
1267				inp = NULL;
1268			}
1269		} else
1270			panic("%s: locking bug", __func__);
1271#ifdef INVARIANTS
1272		if (inp != NULL) {
1273			if (lookupflags & INPLOOKUP_WLOCKPCB)
1274				INP_WLOCK_ASSERT(inp);
1275			else
1276				INP_RLOCK_ASSERT(inp);
1277		}
1278#endif
1279	}
1280	return (inp);
1281}
1282
1283/*
1284 * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1285 * from which a pre-calculated hash value may be extracted.
1286 *
1287 * Possibly more of this logic should be in in6_pcbgroup.c.
1288 */
1289struct inpcb *
1290in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
1291    struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1292{
1293#if defined(PCBGROUP) && !defined(RSS)
1294	struct inpcbgroup *pcbgroup;
1295#endif
1296
1297	KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1298	    ("%s: invalid lookup flags %d", __func__, lookupflags));
1299	KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1300	    ("%s: LOCKPCB not set", __func__));
1301
1302	/*
1303	 * When not using RSS, use connection groups in preference to the
1304	 * reservation table when looking up 4-tuples.  When using RSS, just
1305	 * use the reservation table, due to the cost of the Toeplitz hash
1306	 * in software.
1307	 *
1308	 * XXXRW: This policy belongs in the pcbgroup code, as in principle
1309	 * we could be doing RSS with a non-Toeplitz hash that is affordable
1310	 * in software.
1311	 */
1312#if defined(PCBGROUP) && !defined(RSS)
1313	if (in_pcbgroup_enabled(pcbinfo)) {
1314		pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1315		    fport);
1316		return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1317		    laddr, lport, lookupflags, ifp));
1318	}
1319#endif
1320	return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1321	    lookupflags, ifp));
1322}
1323
1324struct inpcb *
1325in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1326    u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1327    struct ifnet *ifp, struct mbuf *m)
1328{
1329#ifdef PCBGROUP
1330	struct inpcbgroup *pcbgroup;
1331#endif
1332
1333	KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1334	    ("%s: invalid lookup flags %d", __func__, lookupflags));
1335	KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1336	    ("%s: LOCKPCB not set", __func__));
1337
1338#ifdef PCBGROUP
1339	/*
1340	 * If we can use a hardware-generated hash to look up the connection
1341	 * group, use that connection group to find the inpcb.  Otherwise
1342	 * fall back on a software hash -- or the reservation table if we're
1343	 * using RSS.
1344	 *
1345	 * XXXRW: As above, that policy belongs in the pcbgroup code.
1346	 */
1347	if (in_pcbgroup_enabled(pcbinfo) &&
1348	    M_HASHTYPE_TEST(m, M_HASHTYPE_NONE) == 0) {
1349		pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1350		    m->m_pkthdr.flowid);
1351		if (pcbgroup != NULL)
1352			return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr,
1353			    fport, laddr, lport, lookupflags, ifp));
1354#ifndef RSS
1355		pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1356		    fport);
1357		return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1358		    laddr, lport, lookupflags, ifp));
1359#endif
1360	}
1361#endif
1362	return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1363	    lookupflags, ifp));
1364}
1365
1366void
1367init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m, int srcordst)
1368{
1369	struct ip6_hdr *ip;
1370
1371	ip = mtod(m, struct ip6_hdr *);
1372	bzero(sin6, sizeof(*sin6));
1373	sin6->sin6_len = sizeof(*sin6);
1374	sin6->sin6_family = AF_INET6;
1375	sin6->sin6_addr = srcordst ? ip->ip6_dst : ip->ip6_src;
1376
1377	(void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
1378
1379	return;
1380}
1381