xref: /freebsd/sys/netinet6/in6_pcb.c (revision 25ecdc7d52770caf1c9b44b5ec11f468f6b636f3)
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_route.h"
77 #include "opt_rss.h"
78 
79 #include <sys/param.h>
80 #include <sys/systm.h>
81 #include <sys/malloc.h>
82 #include <sys/mbuf.h>
83 #include <sys/domain.h>
84 #include <sys/protosw.h>
85 #include <sys/socket.h>
86 #include <sys/socketvar.h>
87 #include <sys/sockio.h>
88 #include <sys/errno.h>
89 #include <sys/time.h>
90 #include <sys/priv.h>
91 #include <sys/proc.h>
92 #include <sys/jail.h>
93 
94 #include <vm/uma.h>
95 
96 #include <net/if.h>
97 #include <net/if_var.h>
98 #include <net/if_llatbl.h>
99 #include <net/if_types.h>
100 #include <net/route.h>
101 #include <net/route/nhop.h>
102 
103 #include <netinet/in.h>
104 #include <netinet/in_var.h>
105 #include <netinet/in_systm.h>
106 #include <netinet/tcp_var.h>
107 #include <netinet/ip6.h>
108 #include <netinet/ip_var.h>
109 
110 #include <netinet6/ip6_var.h>
111 #include <netinet6/nd6.h>
112 #include <netinet/in_pcb.h>
113 #include <netinet6/in6_pcb.h>
114 #include <netinet6/in6_fib.h>
115 #include <netinet6/scope6_var.h>
116 
117 int
118 in6_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 		KASSERT(sin6->sin6_family == AF_INET6,
150 		    ("%s: invalid address family for %p", __func__, sin6));
151 		KASSERT(sin6->sin6_len == sizeof(*sin6),
152 		    ("%s: invalid address length for %p", __func__, sin6));
153 
154 		if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
155 			return(error);
156 
157 		if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
158 		    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
159 			return (error);
160 
161 		lport = sin6->sin6_port;
162 		if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
163 			/*
164 			 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
165 			 * allow compepte duplication of binding if
166 			 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
167 			 * and a multicast address is bound on both
168 			 * new and duplicated sockets.
169 			 */
170 			if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
171 				reuseport = SO_REUSEADDR|SO_REUSEPORT;
172 			/*
173 			 * XXX: How to deal with SO_REUSEPORT_LB here?
174 			 * Treat same as SO_REUSEPORT for now.
175 			 */
176 			if ((so->so_options &
177 			    (SO_REUSEADDR|SO_REUSEPORT_LB)) != 0)
178 				reuseport_lb = SO_REUSEADDR|SO_REUSEPORT_LB;
179 		} else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
180 			struct epoch_tracker et;
181 			struct ifaddr *ifa;
182 
183 			sin6->sin6_port = 0;		/* yech... */
184 			NET_EPOCH_ENTER(et);
185 			if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
186 			    NULL &&
187 			    (inp->inp_flags & INP_BINDANY) == 0) {
188 				NET_EPOCH_EXIT(et);
189 				return (EADDRNOTAVAIL);
190 			}
191 
192 			/*
193 			 * XXX: bind to an anycast address might accidentally
194 			 * cause sending a packet with anycast source address.
195 			 * We should allow to bind to a deprecated address, since
196 			 * the application dares to use it.
197 			 */
198 			if (ifa != NULL &&
199 			    ((struct in6_ifaddr *)ifa)->ia6_flags &
200 			    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
201 				NET_EPOCH_EXIT(et);
202 				return (EADDRNOTAVAIL);
203 			}
204 			NET_EPOCH_EXIT(et);
205 		}
206 		if (lport) {
207 			struct inpcb *t;
208 			struct tcptw *tw;
209 
210 			/* GROSS */
211 			if (ntohs(lport) <= V_ipport_reservedhigh &&
212 			    ntohs(lport) >= V_ipport_reservedlow &&
213 			    priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT))
214 				return (EACCES);
215 			if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
216 			    priv_check_cred(inp->inp_cred, PRIV_NETINET_REUSEPORT) != 0) {
217 				t = in6_pcblookup_local(pcbinfo,
218 				    &sin6->sin6_addr, lport,
219 				    INPLOOKUP_WILDCARD, cred);
220 				if (t &&
221 				    ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
222 				    ((t->inp_flags & INP_TIMEWAIT) == 0) &&
223 				    (so->so_type != SOCK_STREAM ||
224 				     IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
225 				    (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
226 				     !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
227 				     (t->inp_flags2 & INP_REUSEPORT) ||
228 				     (t->inp_flags2 & INP_REUSEPORT_LB) == 0) &&
229 				    (inp->inp_cred->cr_uid !=
230 				     t->inp_cred->cr_uid))
231 					return (EADDRINUSE);
232 
233 				/*
234 				 * If the socket is a BINDMULTI socket, then
235 				 * the credentials need to match and the
236 				 * original socket also has to have been bound
237 				 * with BINDMULTI.
238 				 */
239 				if (t && (! in_pcbbind_check_bindmulti(inp, t)))
240 					return (EADDRINUSE);
241 
242 #ifdef INET
243 				if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
244 				    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
245 					struct sockaddr_in sin;
246 
247 					in6_sin6_2_sin(&sin, sin6);
248 					t = in_pcblookup_local(pcbinfo,
249 					    sin.sin_addr, lport,
250 					    INPLOOKUP_WILDCARD, cred);
251 					if (t &&
252 					    ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
253 					    ((t->inp_flags &
254 					      INP_TIMEWAIT) == 0) &&
255 					    (so->so_type != SOCK_STREAM ||
256 					     ntohl(t->inp_faddr.s_addr) ==
257 					      INADDR_ANY) &&
258 					    (inp->inp_cred->cr_uid !=
259 					     t->inp_cred->cr_uid))
260 						return (EADDRINUSE);
261 
262 					if (t && (! in_pcbbind_check_bindmulti(inp, t)))
263 						return (EADDRINUSE);
264 				}
265 #endif
266 			}
267 			t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
268 			    lport, lookupflags, cred);
269 			if (t && (t->inp_flags & INP_TIMEWAIT)) {
270 				/*
271 				 * XXXRW: If an incpb has had its timewait
272 				 * state recycled, we treat the address as
273 				 * being in use (for now).  This is better
274 				 * than a panic, but not desirable.
275 				 */
276 				tw = intotw(t);
277 				if (tw == NULL ||
278 				    ((reuseport & tw->tw_so_options) == 0 &&
279 					 (reuseport_lb & tw->tw_so_options) == 0))
280 					return (EADDRINUSE);
281 			} else if (t && (reuseport & inp_so_options(t)) == 0 &&
282 					   (reuseport_lb & inp_so_options(t)) == 0) {
283 				return (EADDRINUSE);
284 			}
285 #ifdef INET
286 			if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
287 			    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
288 				struct sockaddr_in sin;
289 
290 				in6_sin6_2_sin(&sin, sin6);
291 				t = in_pcblookup_local(pcbinfo, sin.sin_addr,
292 				   lport, lookupflags, cred);
293 				if (t && t->inp_flags & INP_TIMEWAIT) {
294 					tw = intotw(t);
295 					if (tw == NULL)
296 						return (EADDRINUSE);
297 					if ((reuseport & tw->tw_so_options) == 0
298 					    && (reuseport_lb & tw->tw_so_options) == 0
299 					    && (ntohl(t->inp_laddr.s_addr) !=
300 					        INADDR_ANY || ((inp->inp_vflag &
301 					                INP_IPV6PROTO) ==
302 					            (t->inp_vflag & INP_IPV6PROTO))))
303 						return (EADDRINUSE);
304 				} else if (t &&
305 				    (reuseport & inp_so_options(t)) == 0 &&
306 				    (reuseport_lb & inp_so_options(t)) == 0 &&
307 				    (ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
308 				        (t->inp_vflag & INP_IPV6PROTO) != 0)) {
309 					return (EADDRINUSE);
310 				}
311 			}
312 #endif
313 		}
314 		inp->in6p_laddr = sin6->sin6_addr;
315 	}
316 	if (lport == 0) {
317 		if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
318 			/* Undo an address bind that may have occurred. */
319 			inp->in6p_laddr = in6addr_any;
320 			return (error);
321 		}
322 	} else {
323 		inp->inp_lport = lport;
324 		if (in_pcbinshash(inp) != 0) {
325 			inp->in6p_laddr = in6addr_any;
326 			inp->inp_lport = 0;
327 			return (EAGAIN);
328 		}
329 	}
330 	return (0);
331 }
332 
333 /*
334  *   Transform old in6_pcbconnect() into an inner subroutine for new
335  *   in6_pcbconnect(): Do some validity-checking on the remote
336  *   address (in mbuf 'nam') and then determine local host address
337  *   (i.e., which interface) to use to access that remote host.
338  *
339  *   This preserves definition of in6_pcbconnect(), while supporting a
340  *   slightly different version for T/TCP.  (This is more than
341  *   a bit of a kludge, but cleaning up the internal interfaces would
342  *   have forced minor changes in every protocol).
343  */
344 static int
345 in6_pcbladdr(struct inpcb *inp, struct sockaddr_in6 *sin6,
346     struct in6_addr *plocal_addr6)
347 {
348 	int error = 0;
349 	int scope_ambiguous = 0;
350 	struct in6_addr in6a;
351 	struct epoch_tracker et;
352 
353 	INP_WLOCK_ASSERT(inp);
354 	INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);	/* XXXRW: why? */
355 
356 	if (sin6->sin6_port == 0)
357 		return (EADDRNOTAVAIL);
358 
359 	if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
360 		scope_ambiguous = 1;
361 	if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
362 		return(error);
363 
364 	if (!CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) {
365 		/*
366 		 * If the destination address is UNSPECIFIED addr,
367 		 * use the loopback addr, e.g ::1.
368 		 */
369 		if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
370 			sin6->sin6_addr = in6addr_loopback;
371 	}
372 	if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
373 		return (error);
374 
375 	NET_EPOCH_ENTER(et);
376 	error = in6_selectsrc_socket(sin6, inp->in6p_outputopts,
377 	    inp, inp->inp_cred, scope_ambiguous, &in6a, NULL);
378 	NET_EPOCH_EXIT(et);
379 	if (error)
380 		return (error);
381 
382 	/*
383 	 * Do not update this earlier, in case we return with an error.
384 	 *
385 	 * XXX: this in6_selectsrc_socket result might replace the bound local
386 	 * address with the address specified by setsockopt(IPV6_PKTINFO).
387 	 * Is it the intended behavior?
388 	 */
389 	*plocal_addr6 = in6a;
390 
391 	/*
392 	 * Don't do pcblookup call here; return interface in
393 	 * plocal_addr6
394 	 * and exit to caller, that will do the lookup.
395 	 */
396 
397 	return (0);
398 }
399 
400 /*
401  * Outer subroutine:
402  * Connect from a socket to a specified address.
403  * Both address and port must be specified in argument sin.
404  * If don't have a local address for this socket yet,
405  * then pick one.
406  */
407 int
408 in6_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
409     struct ucred *cred, struct mbuf *m, bool rehash)
410 {
411 	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
412 	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
413 	struct sockaddr_in6 laddr6;
414 	int error;
415 
416 	KASSERT(sin6->sin6_family == AF_INET6,
417 	    ("%s: invalid address family for %p", __func__, sin6));
418 	KASSERT(sin6->sin6_len == sizeof(*sin6),
419 	    ("%s: invalid address length for %p", __func__, sin6));
420 
421 	bzero(&laddr6, sizeof(laddr6));
422 	laddr6.sin6_family = AF_INET6;
423 
424 	INP_WLOCK_ASSERT(inp);
425 	INP_HASH_WLOCK_ASSERT(pcbinfo);
426 
427 #ifdef ROUTE_MPATH
428 	if (CALC_FLOWID_OUTBOUND) {
429 		uint32_t hash_type, hash_val;
430 
431 		hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
432 		    &sin6->sin6_addr, 0, sin6->sin6_port,
433 		    inp->inp_socket->so_proto->pr_protocol, &hash_type);
434 		inp->inp_flowid = hash_val;
435 		inp->inp_flowtype = hash_type;
436 	}
437 #endif
438 	/*
439 	 * Call inner routine, to assign local interface address.
440 	 * in6_pcbladdr() may automatically fill in sin6_scope_id.
441 	 */
442 	if ((error = in6_pcbladdr(inp, sin6, &laddr6.sin6_addr)) != 0)
443 		return (error);
444 
445 	if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
446 			       sin6->sin6_port,
447 			      IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
448 			      ? &laddr6.sin6_addr : &inp->in6p_laddr,
449 			      inp->inp_lport, 0, NULL, M_NODOM) != NULL) {
450 		return (EADDRINUSE);
451 	}
452 	if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
453 		if (inp->inp_lport == 0) {
454 			/*
455 			 * rehash was required to be true in the past for
456 			 * this case; retain that convention.  However,
457 			 * we now call in_pcb_lport_dest rather than
458 			 * in6_pcbbind; the former does not insert into
459 			 * the hash table, the latter does.  Change rehash
460 			 * to false to do the in_pcbinshash below.
461 			 */
462 			KASSERT(rehash == true,
463 			    ("Rehashing required for unbound inps"));
464 			rehash = false;
465 			error = in_pcb_lport_dest(inp,
466 			    (struct sockaddr *) &laddr6, &inp->inp_lport,
467 			    (struct sockaddr *) sin6, sin6->sin6_port, cred,
468 			    INPLOOKUP_WILDCARD);
469 			if (error)
470 				return (error);
471 		}
472 		inp->in6p_laddr = laddr6.sin6_addr;
473 	}
474 	inp->in6p_faddr = sin6->sin6_addr;
475 	inp->inp_fport = sin6->sin6_port;
476 	/* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
477 	inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
478 	if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
479 		inp->inp_flow |=
480 		    (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
481 
482 	if (rehash) {
483 		in_pcbrehash_mbuf(inp, m);
484 	} else {
485 		in_pcbinshash_mbuf(inp, m);
486 	}
487 
488 	return (0);
489 }
490 
491 int
492 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
493 {
494 
495 	return (in6_pcbconnect_mbuf(inp, nam, cred, NULL, true));
496 }
497 
498 void
499 in6_pcbdisconnect(struct inpcb *inp)
500 {
501 
502 	INP_WLOCK_ASSERT(inp);
503 	INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
504 
505 	bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
506 	inp->inp_fport = 0;
507 	/* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
508 	inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
509 	in_pcbrehash(inp);
510 }
511 
512 struct sockaddr *
513 in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
514 {
515 	struct sockaddr_in6 *sin6;
516 
517 	sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
518 	bzero(sin6, sizeof *sin6);
519 	sin6->sin6_family = AF_INET6;
520 	sin6->sin6_len = sizeof(*sin6);
521 	sin6->sin6_port = port;
522 	sin6->sin6_addr = *addr_p;
523 	(void)sa6_recoverscope(sin6); /* XXX: should catch errors */
524 
525 	return (struct sockaddr *)sin6;
526 }
527 
528 struct sockaddr *
529 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
530 {
531 	struct sockaddr_in sin;
532 	struct sockaddr_in6 *sin6_p;
533 
534 	bzero(&sin, sizeof sin);
535 	sin.sin_family = AF_INET;
536 	sin.sin_len = sizeof(sin);
537 	sin.sin_port = port;
538 	sin.sin_addr = *addr_p;
539 
540 	sin6_p = malloc(sizeof *sin6_p, M_SONAME,
541 		M_WAITOK);
542 	in6_sin_2_v4mapsin6(&sin, sin6_p);
543 
544 	return (struct sockaddr *)sin6_p;
545 }
546 
547 int
548 in6_getsockaddr(struct socket *so, struct sockaddr **nam)
549 {
550 	struct inpcb *inp;
551 	struct in6_addr addr;
552 	in_port_t port;
553 
554 	inp = sotoinpcb(so);
555 	KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
556 
557 	INP_RLOCK(inp);
558 	port = inp->inp_lport;
559 	addr = inp->in6p_laddr;
560 	INP_RUNLOCK(inp);
561 
562 	*nam = in6_sockaddr(port, &addr);
563 	return 0;
564 }
565 
566 int
567 in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
568 {
569 	struct inpcb *inp;
570 	struct in6_addr addr;
571 	in_port_t port;
572 
573 	inp = sotoinpcb(so);
574 	KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
575 
576 	INP_RLOCK(inp);
577 	port = inp->inp_fport;
578 	addr = inp->in6p_faddr;
579 	INP_RUNLOCK(inp);
580 
581 	*nam = in6_sockaddr(port, &addr);
582 	return 0;
583 }
584 
585 int
586 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
587 {
588 	struct	inpcb *inp;
589 	int	error;
590 
591 	inp = sotoinpcb(so);
592 	KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
593 
594 #ifdef INET
595 	if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
596 		error = in_getsockaddr(so, nam);
597 		if (error == 0)
598 			in6_sin_2_v4mapsin6_in_sock(nam);
599 	} else
600 #endif
601 	{
602 		/* scope issues will be handled in in6_getsockaddr(). */
603 		error = in6_getsockaddr(so, nam);
604 	}
605 
606 	return error;
607 }
608 
609 int
610 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
611 {
612 	struct	inpcb *inp;
613 	int	error;
614 
615 	inp = sotoinpcb(so);
616 	KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
617 
618 #ifdef INET
619 	if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
620 		error = in_getpeeraddr(so, nam);
621 		if (error == 0)
622 			in6_sin_2_v4mapsin6_in_sock(nam);
623 	} else
624 #endif
625 	/* scope issues will be handled in in6_getpeeraddr(). */
626 	error = in6_getpeeraddr(so, nam);
627 
628 	return error;
629 }
630 
631 /*
632  * Pass some notification to all connections of a protocol
633  * associated with address dst.  The local address and/or port numbers
634  * may be specified to limit the search.  The "usual action" will be
635  * taken, depending on the ctlinput cmd.  The caller must filter any
636  * cmds that are uninteresting (e.g., no error in the map).
637  * Call the protocol specific routine (if any) to report
638  * any errors for each matching socket.
639  */
640 void
641 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
642     u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
643     int cmd, void *cmdarg,
644     struct inpcb *(*notify)(struct inpcb *, int))
645 {
646 	struct inpcb *inp, *inp_temp;
647 	struct sockaddr_in6 sa6_src, *sa6_dst;
648 	u_short	fport = fport_arg, lport = lport_arg;
649 	u_int32_t flowinfo;
650 	int errno;
651 
652 	if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
653 		return;
654 
655 	sa6_dst = (struct sockaddr_in6 *)dst;
656 	if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
657 		return;
658 
659 	/*
660 	 * note that src can be NULL when we get notify by local fragmentation.
661 	 */
662 	sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
663 	flowinfo = sa6_src.sin6_flowinfo;
664 
665 	/*
666 	 * Redirects go to all references to the destination,
667 	 * and use in6_rtchange to invalidate the route cache.
668 	 * Dead host indications: also use in6_rtchange to invalidate
669 	 * the cache, and deliver the error to all the sockets.
670 	 * Otherwise, if we have knowledge of the local port and address,
671 	 * deliver only to that socket.
672 	 */
673 	if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
674 		fport = 0;
675 		lport = 0;
676 		bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
677 
678 		if (cmd != PRC_HOSTDEAD)
679 			notify = in6_rtchange;
680 	}
681 	errno = inet6ctlerrmap[cmd];
682 	INP_INFO_WLOCK(pcbinfo);
683 	CK_LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
684 		INP_WLOCK(inp);
685 		if ((inp->inp_vflag & INP_IPV6) == 0) {
686 			INP_WUNLOCK(inp);
687 			continue;
688 		}
689 
690 		/*
691 		 * If the error designates a new path MTU for a destination
692 		 * and the application (associated with this socket) wanted to
693 		 * know the value, notify.
694 		 * XXX: should we avoid to notify the value to TCP sockets?
695 		 */
696 		if (cmd == PRC_MSGSIZE && cmdarg != NULL)
697 			ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
698 					*(u_int32_t *)cmdarg);
699 
700 		/*
701 		 * Detect if we should notify the error. If no source and
702 		 * destination ports are specifed, but non-zero flowinfo and
703 		 * local address match, notify the error. This is the case
704 		 * when the error is delivered with an encrypted buffer
705 		 * by ESP. Otherwise, just compare addresses and ports
706 		 * as usual.
707 		 */
708 		if (lport == 0 && fport == 0 && flowinfo &&
709 		    inp->inp_socket != NULL &&
710 		    flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
711 		    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
712 			goto do_notify;
713 		else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
714 					     &sa6_dst->sin6_addr) ||
715 			 inp->inp_socket == 0 ||
716 			 (lport && inp->inp_lport != lport) ||
717 			 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
718 			  !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
719 					      &sa6_src.sin6_addr)) ||
720 			 (fport && inp->inp_fport != fport)) {
721 			INP_WUNLOCK(inp);
722 			continue;
723 		}
724 
725 	  do_notify:
726 		if (notify) {
727 			if ((*notify)(inp, errno))
728 				INP_WUNLOCK(inp);
729 		} else
730 			INP_WUNLOCK(inp);
731 	}
732 	INP_INFO_WUNLOCK(pcbinfo);
733 }
734 
735 /*
736  * Lookup a PCB based on the local address and port.  Caller must hold the
737  * hash lock.  No inpcb locks or references are acquired.
738  */
739 struct inpcb *
740 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
741     u_short lport, int lookupflags, struct ucred *cred)
742 {
743 	struct inpcb *inp;
744 	int matchwild = 3, wildcard;
745 
746 	KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
747 	    ("%s: invalid lookup flags %d", __func__, lookupflags));
748 
749 	INP_HASH_LOCK_ASSERT(pcbinfo);
750 
751 	if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
752 		struct inpcbhead *head;
753 		/*
754 		 * Look for an unconnected (wildcard foreign addr) PCB that
755 		 * matches the local address and port we're looking for.
756 		 */
757 		head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
758 		    INP6_PCBHASHKEY(&in6addr_any), lport, 0,
759 		    pcbinfo->ipi_hashmask)];
760 		CK_LIST_FOREACH(inp, head, inp_hash) {
761 			/* XXX inp locking */
762 			if ((inp->inp_vflag & INP_IPV6) == 0)
763 				continue;
764 			if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
765 			    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
766 			    inp->inp_lport == lport) {
767 				/* Found. */
768 				if (cred == NULL ||
769 				    prison_equal_ip6(cred->cr_prison,
770 					inp->inp_cred->cr_prison))
771 					return (inp);
772 			}
773 		}
774 		/*
775 		 * Not found.
776 		 */
777 		return (NULL);
778 	} else {
779 		struct inpcbporthead *porthash;
780 		struct inpcbport *phd;
781 		struct inpcb *match = NULL;
782 		/*
783 		 * Best fit PCB lookup.
784 		 *
785 		 * First see if this local port is in use by looking on the
786 		 * port hash list.
787 		 */
788 		porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
789 		    pcbinfo->ipi_porthashmask)];
790 		CK_LIST_FOREACH(phd, porthash, phd_hash) {
791 			if (phd->phd_port == lport)
792 				break;
793 		}
794 		if (phd != NULL) {
795 			/*
796 			 * Port is in use by one or more PCBs. Look for best
797 			 * fit.
798 			 */
799 			CK_LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
800 				wildcard = 0;
801 				if (cred != NULL &&
802 				    !prison_equal_ip6(cred->cr_prison,
803 					inp->inp_cred->cr_prison))
804 					continue;
805 				/* XXX inp locking */
806 				if ((inp->inp_vflag & INP_IPV6) == 0)
807 					continue;
808 				if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
809 					wildcard++;
810 				if (!IN6_IS_ADDR_UNSPECIFIED(
811 					&inp->in6p_laddr)) {
812 					if (IN6_IS_ADDR_UNSPECIFIED(laddr))
813 						wildcard++;
814 					else if (!IN6_ARE_ADDR_EQUAL(
815 					    &inp->in6p_laddr, laddr))
816 						continue;
817 				} else {
818 					if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
819 						wildcard++;
820 				}
821 				if (wildcard < matchwild) {
822 					match = inp;
823 					matchwild = wildcard;
824 					if (matchwild == 0)
825 						break;
826 				}
827 			}
828 		}
829 		return (match);
830 	}
831 }
832 
833 void
834 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
835 {
836 	struct inpcb *inp;
837 	struct in6_multi *inm;
838 	struct in6_mfilter *imf;
839 	struct ip6_moptions *im6o;
840 
841 	INP_INFO_WLOCK(pcbinfo);
842 	CK_LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
843 		INP_WLOCK(inp);
844 		if (__predict_false(inp->inp_flags2 & INP_FREED)) {
845 			INP_WUNLOCK(inp);
846 			continue;
847 		}
848 		im6o = inp->in6p_moptions;
849 		if ((inp->inp_vflag & INP_IPV6) && im6o != NULL) {
850 			/*
851 			 * Unselect the outgoing ifp for multicast if it
852 			 * is being detached.
853 			 */
854 			if (im6o->im6o_multicast_ifp == ifp)
855 				im6o->im6o_multicast_ifp = NULL;
856 			/*
857 			 * Drop multicast group membership if we joined
858 			 * through the interface being detached.
859 			 */
860 restart:
861 			IP6_MFILTER_FOREACH(imf, &im6o->im6o_head) {
862 				if ((inm = imf->im6f_in6m) == NULL)
863 					continue;
864 				if (inm->in6m_ifp != ifp)
865 					continue;
866 				ip6_mfilter_remove(&im6o->im6o_head, imf);
867 				IN6_MULTI_LOCK_ASSERT();
868 				in6_leavegroup_locked(inm, NULL);
869 				ip6_mfilter_free(imf);
870 				goto restart;
871 			}
872 		}
873 		INP_WUNLOCK(inp);
874 	}
875 	INP_INFO_WUNLOCK(pcbinfo);
876 }
877 
878 /*
879  * Check for alternatives when higher level complains
880  * about service problems.  For now, invalidate cached
881  * routing information.  If the route was created dynamically
882  * (by a redirect), time to try a default gateway again.
883  */
884 void
885 in6_losing(struct inpcb *inp)
886 {
887 
888 	RO_INVALIDATE_CACHE(&inp->inp_route6);
889 }
890 
891 /*
892  * After a routing change, flush old routing
893  * and allocate a (hopefully) better one.
894  */
895 struct inpcb *
896 in6_rtchange(struct inpcb *inp, int errno __unused)
897 {
898 
899 	RO_INVALIDATE_CACHE(&inp->inp_route6);
900 	return inp;
901 }
902 
903 static struct inpcb *
904 in6_pcblookup_lbgroup(const struct inpcbinfo *pcbinfo,
905     const struct in6_addr *laddr, uint16_t lport, const struct in6_addr *faddr,
906     uint16_t fport, int lookupflags, uint8_t numa_domain)
907 {
908 	struct inpcb *local_wild, *numa_wild;
909 	const struct inpcblbgrouphead *hdr;
910 	struct inpcblbgroup *grp;
911 	uint32_t idx;
912 
913 	INP_HASH_LOCK_ASSERT(pcbinfo);
914 
915 	hdr = &pcbinfo->ipi_lbgrouphashbase[
916 	    INP_PCBPORTHASH(lport, pcbinfo->ipi_lbgrouphashmask)];
917 
918 	/*
919 	 * Order of socket selection:
920 	 * 1. non-wild.
921 	 * 2. wild (if lookupflags contains INPLOOKUP_WILDCARD).
922 	 *
923 	 * NOTE:
924 	 * - Load balanced group does not contain jailed sockets.
925 	 * - Load balanced does not contain IPv4 mapped INET6 wild sockets.
926 	 */
927 	local_wild = NULL;
928 	numa_wild = NULL;
929 	CK_LIST_FOREACH(grp, hdr, il_list) {
930 #ifdef INET
931 		if (!(grp->il_vflag & INP_IPV6))
932 			continue;
933 #endif
934 		if (grp->il_lport != lport)
935 			continue;
936 
937 		idx = INP_PCBLBGROUP_PKTHASH(INP6_PCBHASHKEY(faddr), lport,
938 		    fport) % grp->il_inpcnt;
939 		if (IN6_ARE_ADDR_EQUAL(&grp->il6_laddr, laddr)) {
940 			if (numa_domain == M_NODOM ||
941 			    grp->il_numa_domain == numa_domain) {
942 				return (grp->il_inp[idx]);
943 			}
944 			else
945 				numa_wild = grp->il_inp[idx];
946 		}
947 		if (IN6_IS_ADDR_UNSPECIFIED(&grp->il6_laddr) &&
948 		    (lookupflags & INPLOOKUP_WILDCARD) != 0 &&
949 		    (local_wild == NULL || numa_domain == M_NODOM ||
950 			grp->il_numa_domain == numa_domain)) {
951 			local_wild = grp->il_inp[idx];
952 		}
953 	}
954 	if (numa_wild != NULL)
955 		return (numa_wild);
956 	return (local_wild);
957 }
958 
959 #ifdef PCBGROUP
960 /*
961  * Lookup PCB in hash list, using pcbgroup tables.
962  */
963 static struct inpcb *
964 in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
965     struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr,
966     u_int lport_arg, int lookupflags, struct ifnet *ifp)
967 {
968 	struct inpcbhead *head;
969 	struct inpcb *inp, *tmpinp;
970 	u_short fport = fport_arg, lport = lport_arg;
971 	bool locked;
972 
973 	/*
974 	 * First look for an exact match.
975 	 */
976 	tmpinp = NULL;
977 	INP_GROUP_LOCK(pcbgroup);
978 	head = &pcbgroup->ipg_hashbase[INP_PCBHASH(
979 	    INP6_PCBHASHKEY(faddr), lport, fport, pcbgroup->ipg_hashmask)];
980 	CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
981 		/* XXX inp locking */
982 		if ((inp->inp_vflag & INP_IPV6) == 0)
983 			continue;
984 		if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
985 		    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
986 		    inp->inp_fport == fport &&
987 		    inp->inp_lport == lport) {
988 			/*
989 			 * XXX We should be able to directly return
990 			 * the inp here, without any checks.
991 			 * Well unless both bound with SO_REUSEPORT?
992 			 */
993 			if (prison_flag(inp->inp_cred, PR_IP6))
994 				goto found;
995 			if (tmpinp == NULL)
996 				tmpinp = inp;
997 		}
998 	}
999 	if (tmpinp != NULL) {
1000 		inp = tmpinp;
1001 		goto found;
1002 	}
1003 
1004 	/*
1005 	 * Then look for a wildcard match in the pcbgroup.
1006 	 */
1007 	if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1008 		struct inpcb *local_wild = NULL, *local_exact = NULL;
1009 		struct inpcb *jail_wild = NULL;
1010 		int injail;
1011 
1012 		/*
1013 		 * Order of socket selection - we always prefer jails.
1014 		 *      1. jailed, non-wild.
1015 		 *      2. jailed, wild.
1016 		 *      3. non-jailed, non-wild.
1017 		 *      4. non-jailed, wild.
1018 		 */
1019 		head = &pcbgroup->ipg_hashbase[
1020 		    INP_PCBHASH(INADDR_ANY, lport, 0, pcbgroup->ipg_hashmask)];
1021 		CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
1022 			/* XXX inp locking */
1023 			if ((inp->inp_vflag & INP_IPV6) == 0)
1024 				continue;
1025 
1026 			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1027 			    inp->inp_lport != lport) {
1028 				continue;
1029 			}
1030 
1031 			injail = prison_flag(inp->inp_cred, PR_IP6);
1032 			if (injail) {
1033 				if (prison_check_ip6(inp->inp_cred,
1034 				    laddr) != 0)
1035 					continue;
1036 			} else {
1037 				if (local_exact != NULL)
1038 					continue;
1039 			}
1040 
1041 			if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1042 				if (injail)
1043 					goto found;
1044 				else
1045 					local_exact = inp;
1046 			} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1047 				if (injail)
1048 					jail_wild = inp;
1049 				else
1050 					local_wild = inp;
1051 			}
1052 		} /* LIST_FOREACH */
1053 
1054 		inp = jail_wild;
1055 		if (inp == NULL)
1056 			inp = jail_wild;
1057 		if (inp == NULL)
1058 			inp = local_exact;
1059 		if (inp == NULL)
1060 			inp = local_wild;
1061 		if (inp != NULL)
1062 			goto found;
1063 	}
1064 
1065 	/*
1066 	 * Then look for a wildcard match, if requested.
1067 	 */
1068 	if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1069 		struct inpcb *local_wild = NULL, *local_exact = NULL;
1070 		struct inpcb *jail_wild = NULL;
1071 		int injail;
1072 
1073 		/*
1074 		 * Order of socket selection - we always prefer jails.
1075 		 *      1. jailed, non-wild.
1076 		 *      2. jailed, wild.
1077 		 *      3. non-jailed, non-wild.
1078 		 *      4. non-jailed, wild.
1079 		 */
1080 		head = &pcbinfo->ipi_wildbase[INP_PCBHASH(
1081 		    INP6_PCBHASHKEY(&in6addr_any), lport, 0,
1082 		    pcbinfo->ipi_wildmask)];
1083 		CK_LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
1084 			/* XXX inp locking */
1085 			if ((inp->inp_vflag & INP_IPV6) == 0)
1086 				continue;
1087 
1088 			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1089 			    inp->inp_lport != lport) {
1090 				continue;
1091 			}
1092 
1093 			injail = prison_flag(inp->inp_cred, PR_IP6);
1094 			if (injail) {
1095 				if (prison_check_ip6(inp->inp_cred,
1096 				    laddr) != 0)
1097 					continue;
1098 			} else {
1099 				if (local_exact != NULL)
1100 					continue;
1101 			}
1102 
1103 			if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1104 				if (injail)
1105 					goto found;
1106 				else
1107 					local_exact = inp;
1108 			} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1109 				if (injail)
1110 					jail_wild = inp;
1111 				else
1112 					local_wild = inp;
1113 			}
1114 		} /* LIST_FOREACH */
1115 
1116 		inp = jail_wild;
1117 		if (inp == NULL)
1118 			inp = jail_wild;
1119 		if (inp == NULL)
1120 			inp = local_exact;
1121 		if (inp == NULL)
1122 			inp = local_wild;
1123 		if (inp != NULL)
1124 			goto found;
1125 	} /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1126 	INP_GROUP_UNLOCK(pcbgroup);
1127 	return (NULL);
1128 
1129 found:
1130 	if (lookupflags & INPLOOKUP_WLOCKPCB)
1131 		locked = INP_TRY_WLOCK(inp);
1132 	else if (lookupflags & INPLOOKUP_RLOCKPCB)
1133 		locked = INP_TRY_RLOCK(inp);
1134 	else
1135 		panic("%s: locking buf", __func__);
1136 	if (!locked)
1137 		in_pcbref(inp);
1138 	INP_GROUP_UNLOCK(pcbgroup);
1139 	if (!locked) {
1140 		if (lookupflags & INPLOOKUP_WLOCKPCB) {
1141 			INP_WLOCK(inp);
1142 			if (in_pcbrele_wlocked(inp))
1143 				return (NULL);
1144 		} else {
1145 			INP_RLOCK(inp);
1146 			if (in_pcbrele_rlocked(inp))
1147 				return (NULL);
1148 		}
1149 	}
1150 #ifdef INVARIANTS
1151 	if (lookupflags & INPLOOKUP_WLOCKPCB)
1152 		INP_WLOCK_ASSERT(inp);
1153 	else
1154 		INP_RLOCK_ASSERT(inp);
1155 #endif
1156 	return (inp);
1157 }
1158 #endif /* PCBGROUP */
1159 
1160 /*
1161  * Lookup PCB in hash list.  Used in in_pcb.c as well as here.
1162  */
1163 struct inpcb *
1164 in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1165     u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1166     int lookupflags, struct ifnet *ifp, uint8_t numa_domain)
1167 {
1168 	struct inpcbhead *head;
1169 	struct inpcb *inp, *tmpinp;
1170 	u_short fport = fport_arg, lport = lport_arg;
1171 
1172 	KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1173 	    ("%s: invalid lookup flags %d", __func__, lookupflags));
1174 
1175 	INP_HASH_LOCK_ASSERT(pcbinfo);
1176 
1177 	/*
1178 	 * First look for an exact match.
1179 	 */
1180 	tmpinp = NULL;
1181 	head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
1182 	    INP6_PCBHASHKEY(faddr), lport, fport, pcbinfo->ipi_hashmask)];
1183 	CK_LIST_FOREACH(inp, head, inp_hash) {
1184 		/* XXX inp locking */
1185 		if ((inp->inp_vflag & INP_IPV6) == 0)
1186 			continue;
1187 		if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1188 		    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1189 		    inp->inp_fport == fport &&
1190 		    inp->inp_lport == lport) {
1191 			/*
1192 			 * XXX We should be able to directly return
1193 			 * the inp here, without any checks.
1194 			 * Well unless both bound with SO_REUSEPORT?
1195 			 */
1196 			if (prison_flag(inp->inp_cred, PR_IP6))
1197 				return (inp);
1198 			if (tmpinp == NULL)
1199 				tmpinp = inp;
1200 		}
1201 	}
1202 	if (tmpinp != NULL)
1203 		return (tmpinp);
1204 
1205 	/*
1206 	 * Then look in lb group (for wildcard match).
1207 	 */
1208 	if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1209 		inp = in6_pcblookup_lbgroup(pcbinfo, laddr, lport, faddr,
1210 		    fport, lookupflags, numa_domain);
1211 		if (inp != NULL)
1212 			return (inp);
1213 	}
1214 
1215 	/*
1216 	 * Then look for a wildcard match, if requested.
1217 	 */
1218 	if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1219 		struct inpcb *local_wild = NULL, *local_exact = NULL;
1220 		struct inpcb *jail_wild = NULL;
1221 		int injail;
1222 
1223 		/*
1224 		 * Order of socket selection - we always prefer jails.
1225 		 *      1. jailed, non-wild.
1226 		 *      2. jailed, wild.
1227 		 *      3. non-jailed, non-wild.
1228 		 *      4. non-jailed, wild.
1229 		 */
1230 		head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
1231 		    INP6_PCBHASHKEY(&in6addr_any), lport, 0,
1232 		    pcbinfo->ipi_hashmask)];
1233 		CK_LIST_FOREACH(inp, head, inp_hash) {
1234 			/* XXX inp locking */
1235 			if ((inp->inp_vflag & INP_IPV6) == 0)
1236 				continue;
1237 
1238 			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1239 			    inp->inp_lport != lport) {
1240 				continue;
1241 			}
1242 
1243 			injail = prison_flag(inp->inp_cred, PR_IP6);
1244 			if (injail) {
1245 				if (prison_check_ip6(inp->inp_cred,
1246 				    laddr) != 0)
1247 					continue;
1248 			} else {
1249 				if (local_exact != NULL)
1250 					continue;
1251 			}
1252 
1253 			if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1254 				if (injail)
1255 					return (inp);
1256 				else
1257 					local_exact = inp;
1258 			} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1259 				if (injail)
1260 					jail_wild = inp;
1261 				else
1262 					local_wild = inp;
1263 			}
1264 		} /* LIST_FOREACH */
1265 
1266 		if (jail_wild != NULL)
1267 			return (jail_wild);
1268 		if (local_exact != NULL)
1269 			return (local_exact);
1270 		if (local_wild != NULL)
1271 			return (local_wild);
1272 	} /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1273 
1274 	/*
1275 	 * Not found.
1276 	 */
1277 	return (NULL);
1278 }
1279 
1280 /*
1281  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1282  * hash list lock, and will return the inpcb locked (i.e., requires
1283  * INPLOOKUP_LOCKPCB).
1284  */
1285 static struct inpcb *
1286 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1287     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1288     struct ifnet *ifp, uint8_t numa_domain)
1289 {
1290 	struct inpcb *inp;
1291 
1292 	inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1293 	    lookupflags & INPLOOKUP_WILDCARD, ifp, numa_domain);
1294 	if (inp != NULL) {
1295 		if (lookupflags & INPLOOKUP_WLOCKPCB) {
1296 			INP_WLOCK(inp);
1297 		} else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1298 			INP_RLOCK(inp);
1299 		} else
1300 			panic("%s: locking bug", __func__);
1301 		if (__predict_false(inp->inp_flags2 & INP_FREED)) {
1302 			INP_UNLOCK(inp);
1303 			inp = NULL;
1304 		}
1305 	}
1306 	return (inp);
1307 }
1308 
1309 /*
1310  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1311  * from which a pre-calculated hash value may be extracted.
1312  *
1313  * Possibly more of this logic should be in in6_pcbgroup.c.
1314  */
1315 struct inpcb *
1316 in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
1317     struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1318 {
1319 #if defined(PCBGROUP) && !defined(RSS)
1320 	struct inpcbgroup *pcbgroup;
1321 #endif
1322 
1323 	KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1324 	    ("%s: invalid lookup flags %d", __func__, lookupflags));
1325 	KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1326 	    ("%s: LOCKPCB not set", __func__));
1327 
1328 	/*
1329 	 * When not using RSS, use connection groups in preference to the
1330 	 * reservation table when looking up 4-tuples.  When using RSS, just
1331 	 * use the reservation table, due to the cost of the Toeplitz hash
1332 	 * in software.
1333 	 *
1334 	 * XXXRW: This policy belongs in the pcbgroup code, as in principle
1335 	 * we could be doing RSS with a non-Toeplitz hash that is affordable
1336 	 * in software.
1337 	 */
1338 #if defined(PCBGROUP) && !defined(RSS)
1339 	if (in_pcbgroup_enabled(pcbinfo)) {
1340 		pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1341 		    fport);
1342 		return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1343 		    laddr, lport, lookupflags, ifp));
1344 	}
1345 #endif
1346 	return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1347 	    lookupflags, ifp, M_NODOM));
1348 }
1349 
1350 struct inpcb *
1351 in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1352     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1353     struct ifnet *ifp, struct mbuf *m)
1354 {
1355 #ifdef PCBGROUP
1356 	struct inpcbgroup *pcbgroup;
1357 #endif
1358 
1359 	KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1360 	    ("%s: invalid lookup flags %d", __func__, lookupflags));
1361 	KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1362 	    ("%s: LOCKPCB not set", __func__));
1363 
1364 #ifdef PCBGROUP
1365 	/*
1366 	 * If we can use a hardware-generated hash to look up the connection
1367 	 * group, use that connection group to find the inpcb.  Otherwise
1368 	 * fall back on a software hash -- or the reservation table if we're
1369 	 * using RSS.
1370 	 *
1371 	 * XXXRW: As above, that policy belongs in the pcbgroup code.
1372 	 */
1373 	if (in_pcbgroup_enabled(pcbinfo) &&
1374 	    M_HASHTYPE_TEST(m, M_HASHTYPE_NONE) == 0) {
1375 		pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1376 		    m->m_pkthdr.flowid);
1377 		if (pcbgroup != NULL)
1378 			return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr,
1379 			    fport, laddr, lport, lookupflags, ifp));
1380 #ifndef RSS
1381 		pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1382 		    fport);
1383 		return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1384 		    laddr, lport, lookupflags, ifp));
1385 #endif
1386 	}
1387 #endif
1388 	return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1389 	    lookupflags, ifp, m->m_pkthdr.numa_domain));
1390 }
1391 
1392 void
1393 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m, int srcordst)
1394 {
1395 	struct ip6_hdr *ip;
1396 
1397 	ip = mtod(m, struct ip6_hdr *);
1398 	bzero(sin6, sizeof(*sin6));
1399 	sin6->sin6_len = sizeof(*sin6);
1400 	sin6->sin6_family = AF_INET6;
1401 	sin6->sin6_addr = srcordst ? ip->ip6_dst : ip->ip6_src;
1402 
1403 	(void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
1404 
1405 	return;
1406 }
1407