xref: /freebsd/sys/netinet6/in6_pcb.c (revision e1e636193db45630c7881246d25902e57c43d24e)
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 
67 #include <sys/cdefs.h>
68 #include "opt_inet.h"
69 #include "opt_inet6.h"
70 #include "opt_ipsec.h"
71 #include "opt_route.h"
72 #include "opt_rss.h"
73 
74 #include <sys/hash.h>
75 #include <sys/param.h>
76 #include <sys/systm.h>
77 #include <sys/malloc.h>
78 #include <sys/mbuf.h>
79 #include <sys/domain.h>
80 #include <sys/proc.h>
81 #include <sys/protosw.h>
82 #include <sys/smr.h>
83 #include <sys/socket.h>
84 #include <sys/socketvar.h>
85 #include <sys/sockio.h>
86 #include <sys/errno.h>
87 #include <sys/time.h>
88 #include <sys/priv.h>
89 #include <sys/proc.h>
90 #include <sys/jail.h>
91 
92 #include <vm/uma.h>
93 
94 #include <net/if.h>
95 #include <net/if_var.h>
96 #include <net/if_llatbl.h>
97 #include <net/if_types.h>
98 #include <net/route.h>
99 #include <net/route/nhop.h>
100 
101 #include <netinet/in.h>
102 #include <netinet/in_var.h>
103 #include <netinet/in_systm.h>
104 #include <netinet/ip6.h>
105 #include <netinet/ip_var.h>
106 
107 #include <netinet6/ip6_var.h>
108 #include <netinet6/nd6.h>
109 #include <netinet/in_pcb.h>
110 #include <netinet/in_pcb_var.h>
111 #include <netinet6/in6_pcb.h>
112 #include <netinet6/in6_fib.h>
113 #include <netinet6/scope6_var.h>
114 
115 int
116 in6_pcbsetport(struct in6_addr *laddr, struct inpcb *inp, struct ucred *cred)
117 {
118 	struct socket *so = inp->inp_socket;
119 	u_int16_t lport = 0;
120 	int error, lookupflags = 0;
121 #ifdef INVARIANTS
122 	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
123 #endif
124 
125 	INP_WLOCK_ASSERT(inp);
126 	INP_HASH_WLOCK_ASSERT(pcbinfo);
127 
128 	error = prison_local_ip6(cred, laddr,
129 	    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0));
130 	if (error)
131 		return(error);
132 
133 	/* XXX: this is redundant when called from in6_pcbbind */
134 	if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT|SO_REUSEPORT_LB)) == 0)
135 		lookupflags = INPLOOKUP_WILDCARD;
136 
137 	inp->inp_flags |= INP_ANONPORT;
138 
139 	error = in_pcb_lport(inp, NULL, &lport, cred, lookupflags);
140 	if (error != 0)
141 		return (error);
142 
143 	inp->inp_lport = lport;
144 	if (in_pcbinshash(inp) != 0) {
145 		inp->in6p_laddr = in6addr_any;
146 		inp->inp_lport = 0;
147 		return (EAGAIN);
148 	}
149 
150 	return (0);
151 }
152 
153 int
154 in6_pcbbind(struct inpcb *inp, struct sockaddr_in6 *sin6, struct ucred *cred)
155 {
156 	struct socket *so = inp->inp_socket;
157 	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
158 	u_short	lport = 0;
159 	int error, lookupflags = 0;
160 	int reuseport = (so->so_options & SO_REUSEPORT);
161 
162 	/*
163 	 * XXX: Maybe we could let SO_REUSEPORT_LB set SO_REUSEPORT bit here
164 	 * so that we don't have to add to the (already messy) code below.
165 	 */
166 	int reuseport_lb = (so->so_options & SO_REUSEPORT_LB);
167 
168 	INP_WLOCK_ASSERT(inp);
169 	INP_HASH_WLOCK_ASSERT(pcbinfo);
170 
171 	if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
172 		return (EINVAL);
173 	if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT|SO_REUSEPORT_LB)) == 0)
174 		lookupflags = INPLOOKUP_WILDCARD;
175 	if (sin6 == NULL) {
176 		if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
177 		    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
178 			return (error);
179 	} else {
180 		KASSERT(sin6->sin6_family == AF_INET6,
181 		    ("%s: invalid address family for %p", __func__, sin6));
182 		KASSERT(sin6->sin6_len == sizeof(*sin6),
183 		    ("%s: invalid address length for %p", __func__, sin6));
184 
185 		if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
186 			return(error);
187 
188 		if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
189 		    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
190 			return (error);
191 
192 		lport = sin6->sin6_port;
193 		if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
194 			/*
195 			 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
196 			 * allow compepte duplication of binding if
197 			 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
198 			 * and a multicast address is bound on both
199 			 * new and duplicated sockets.
200 			 */
201 			if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
202 				reuseport = SO_REUSEADDR|SO_REUSEPORT;
203 			/*
204 			 * XXX: How to deal with SO_REUSEPORT_LB here?
205 			 * Treat same as SO_REUSEPORT for now.
206 			 */
207 			if ((so->so_options &
208 			    (SO_REUSEADDR|SO_REUSEPORT_LB)) != 0)
209 				reuseport_lb = SO_REUSEADDR|SO_REUSEPORT_LB;
210 		} else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
211 			struct epoch_tracker et;
212 			struct ifaddr *ifa;
213 
214 			sin6->sin6_port = 0;		/* yech... */
215 			NET_EPOCH_ENTER(et);
216 			if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
217 			    NULL &&
218 			    (inp->inp_flags & INP_BINDANY) == 0) {
219 				NET_EPOCH_EXIT(et);
220 				return (EADDRNOTAVAIL);
221 			}
222 
223 			/*
224 			 * XXX: bind to an anycast address might accidentally
225 			 * cause sending a packet with anycast source address.
226 			 * We should allow to bind to a deprecated address, since
227 			 * the application dares to use it.
228 			 */
229 			if (ifa != NULL &&
230 			    ((struct in6_ifaddr *)ifa)->ia6_flags &
231 			    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
232 				NET_EPOCH_EXIT(et);
233 				return (EADDRNOTAVAIL);
234 			}
235 			NET_EPOCH_EXIT(et);
236 		}
237 		if (lport) {
238 			struct inpcb *t;
239 
240 			/* GROSS */
241 			if (ntohs(lport) <= V_ipport_reservedhigh &&
242 			    ntohs(lport) >= V_ipport_reservedlow &&
243 			    priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT))
244 				return (EACCES);
245 			if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
246 			    priv_check_cred(inp->inp_cred, PRIV_NETINET_REUSEPORT) != 0) {
247 				t = in6_pcblookup_local(pcbinfo,
248 				    &sin6->sin6_addr, lport,
249 				    INPLOOKUP_WILDCARD, cred);
250 				if (t != NULL &&
251 				    (so->so_type != SOCK_STREAM ||
252 				     IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
253 				    (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
254 				     !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
255 				     (t->inp_socket->so_options & SO_REUSEPORT) ||
256 				     (t->inp_socket->so_options & SO_REUSEPORT_LB) == 0) &&
257 				    (inp->inp_cred->cr_uid !=
258 				     t->inp_cred->cr_uid))
259 					return (EADDRINUSE);
260 
261 #ifdef INET
262 				if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
263 				    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
264 					struct sockaddr_in sin;
265 
266 					in6_sin6_2_sin(&sin, sin6);
267 					t = in_pcblookup_local(pcbinfo,
268 					    sin.sin_addr, lport,
269 					    INPLOOKUP_WILDCARD, cred);
270 					if (t != NULL &&
271 					    (so->so_type != SOCK_STREAM ||
272 					     ntohl(t->inp_faddr.s_addr) ==
273 					      INADDR_ANY) &&
274 					    (inp->inp_cred->cr_uid !=
275 					     t->inp_cred->cr_uid))
276 						return (EADDRINUSE);
277 				}
278 #endif
279 			}
280 			t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
281 			    lport, lookupflags, cred);
282 			if (t && (reuseport & t->inp_socket->so_options) == 0 &&
283 			    (reuseport_lb & t->inp_socket->so_options) == 0) {
284 				return (EADDRINUSE);
285 			}
286 #ifdef INET
287 			if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
288 			    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
289 				struct sockaddr_in sin;
290 
291 				in6_sin6_2_sin(&sin, sin6);
292 				t = in_pcblookup_local(pcbinfo, sin.sin_addr,
293 				   lport, lookupflags, cred);
294 				if (t &&
295 				    (reuseport & t->inp_socket->so_options) == 0 &&
296 				    (reuseport_lb & t->inp_socket->so_options) == 0 &&
297 				    (ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
298 				        (t->inp_vflag & INP_IPV6PROTO) != 0)) {
299 					return (EADDRINUSE);
300 				}
301 			}
302 #endif
303 		}
304 		inp->in6p_laddr = sin6->sin6_addr;
305 	}
306 	if (lport == 0) {
307 		if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
308 			/* Undo an address bind that may have occurred. */
309 			inp->in6p_laddr = in6addr_any;
310 			return (error);
311 		}
312 	} else {
313 		inp->inp_lport = lport;
314 		if (in_pcbinshash(inp) != 0) {
315 			inp->in6p_laddr = in6addr_any;
316 			inp->inp_lport = 0;
317 			return (EAGAIN);
318 		}
319 	}
320 	return (0);
321 }
322 
323 /*
324  *   Transform old in6_pcbconnect() into an inner subroutine for new
325  *   in6_pcbconnect(): Do some validity-checking on the remote
326  *   address (in mbuf 'nam') and then determine local host address
327  *   (i.e., which interface) to use to access that remote host.
328  *
329  *   This preserves definition of in6_pcbconnect(), while supporting a
330  *   slightly different version for T/TCP.  (This is more than
331  *   a bit of a kludge, but cleaning up the internal interfaces would
332  *   have forced minor changes in every protocol).
333  */
334 static int
335 in6_pcbladdr(struct inpcb *inp, struct sockaddr_in6 *sin6,
336     struct in6_addr *plocal_addr6, bool sas_required)
337 {
338 	int error = 0;
339 	int scope_ambiguous = 0;
340 	struct in6_addr in6a;
341 
342 	NET_EPOCH_ASSERT();
343 	INP_WLOCK_ASSERT(inp);
344 	INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);	/* XXXRW: why? */
345 
346 	if (sin6->sin6_port == 0)
347 		return (EADDRNOTAVAIL);
348 
349 	if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
350 		scope_ambiguous = 1;
351 	if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
352 		return(error);
353 
354 	if (!CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) {
355 		/*
356 		 * If the destination address is UNSPECIFIED addr,
357 		 * use the loopback addr, e.g ::1.
358 		 */
359 		if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
360 			sin6->sin6_addr = in6addr_loopback;
361 	}
362 	if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
363 		return (error);
364 
365 	if (sas_required) {
366 		error = in6_selectsrc_socket(sin6, inp->in6p_outputopts,
367 		    inp, inp->inp_cred, scope_ambiguous, &in6a, NULL);
368 		if (error)
369 			return (error);
370 	} else {
371 		/*
372 		 * Source address selection isn't required when syncache
373 		 * has already established connection and both source and
374 		 * destination addresses was chosen.
375 		 *
376 		 * This also includes the case when fwd_tag was used to
377 		 * select source address in tcp_input().
378 		 */
379 		in6a = inp->in6p_laddr;
380 	}
381 
382 	if (IN6_IS_ADDR_UNSPECIFIED(&in6a))
383 		return (EHOSTUNREACH);
384 	/*
385 	 * Do not update this earlier, in case we return with an error.
386 	 *
387 	 * XXX: this in6_selectsrc_socket result might replace the bound local
388 	 * address with the address specified by setsockopt(IPV6_PKTINFO).
389 	 * Is it the intended behavior?
390 	 */
391 	*plocal_addr6 = in6a;
392 
393 	/*
394 	 * Don't do pcblookup call here; return interface in
395 	 * plocal_addr6
396 	 * and exit to caller, that will do the lookup.
397 	 */
398 
399 	return (0);
400 }
401 
402 /*
403  * Outer subroutine:
404  * Connect from a socket to a specified address.
405  * Both address and port must be specified in argument sin.
406  * If don't have a local address for this socket yet,
407  * then pick one.
408  */
409 int
410 in6_pcbconnect(struct inpcb *inp, struct sockaddr_in6 *sin6, struct ucred *cred,
411     bool sas_required)
412 {
413 	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
414 	struct sockaddr_in6 laddr6;
415 	int error;
416 
417 	NET_EPOCH_ASSERT();
418 	INP_WLOCK_ASSERT(inp);
419 	INP_HASH_WLOCK_ASSERT(pcbinfo);
420 	KASSERT(sin6->sin6_family == AF_INET6,
421 	    ("%s: invalid address family for %p", __func__, sin6));
422 	KASSERT(sin6->sin6_len == sizeof(*sin6),
423 	    ("%s: invalid address length for %p", __func__, sin6));
424 	KASSERT(IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr),
425 	    ("%s: inp is already connected", __func__));
426 
427 	bzero(&laddr6, sizeof(laddr6));
428 	laddr6.sin6_family = AF_INET6;
429 
430 #ifdef ROUTE_MPATH
431 	if (CALC_FLOWID_OUTBOUND) {
432 		uint32_t hash_type, hash_val;
433 
434 		hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
435 		    &sin6->sin6_addr, 0, sin6->sin6_port,
436 		    inp->inp_socket->so_proto->pr_protocol, &hash_type);
437 		inp->inp_flowid = hash_val;
438 		inp->inp_flowtype = hash_type;
439 	}
440 #endif
441 	/*
442 	 * Call inner routine, to assign local interface address.
443 	 * in6_pcbladdr() may automatically fill in sin6_scope_id.
444 	 */
445 	if ((error = in6_pcbladdr(inp, sin6, &laddr6.sin6_addr,
446 	    sas_required)) != 0)
447 		return (error);
448 
449 	if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
450 	    sin6->sin6_port, IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
451 	    &laddr6.sin6_addr : &inp->in6p_laddr, inp->inp_lport, 0,
452 	    M_NODOM) != NULL)
453 		return (EADDRINUSE);
454 	if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
455 		if (inp->inp_lport == 0) {
456 			error = in_pcb_lport_dest(inp,
457 			    (struct sockaddr *) &laddr6, &inp->inp_lport,
458 			    (struct sockaddr *) sin6, sin6->sin6_port, cred,
459 			    INPLOOKUP_WILDCARD);
460 			if (error)
461 				return (error);
462 		}
463 		inp->in6p_laddr = laddr6.sin6_addr;
464 	}
465 	inp->in6p_faddr = sin6->sin6_addr;
466 	inp->inp_fport = sin6->sin6_port;
467 	/* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
468 	inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
469 	if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
470 		inp->inp_flow |=
471 		    (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
472 
473 	if ((inp->inp_flags & INP_INHASHLIST) != 0) {
474 		in_pcbrehash(inp);
475 	} else {
476 		in_pcbinshash(inp);
477 	}
478 
479 	return (0);
480 }
481 
482 void
483 in6_pcbdisconnect(struct inpcb *inp)
484 {
485 
486 	INP_WLOCK_ASSERT(inp);
487 	INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
488 	KASSERT(inp->inp_smr == SMR_SEQ_INVALID,
489 	    ("%s: inp %p was already disconnected", __func__, inp));
490 
491 	in_pcbremhash_locked(inp);
492 
493 	/* See the comment in in_pcbinshash(). */
494 	inp->inp_smr = smr_advance(inp->inp_pcbinfo->ipi_smr);
495 
496 	/* XXX-MJ torn writes are visible to SMR lookup */
497 	memset(&inp->in6p_laddr, 0, sizeof(inp->in6p_laddr));
498 	memset(&inp->in6p_faddr, 0, sizeof(inp->in6p_faddr));
499 	inp->inp_fport = 0;
500 	/* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
501 	inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
502 }
503 
504 int
505 in6_getsockaddr(struct socket *so, struct sockaddr *sa)
506 {
507 	struct inpcb *inp;
508 
509 	inp = sotoinpcb(so);
510 	KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
511 
512 	*(struct sockaddr_in6 *)sa = (struct sockaddr_in6 ){
513 		.sin6_len = sizeof(struct sockaddr_in6),
514 		.sin6_family = AF_INET6,
515 		.sin6_port = inp->inp_lport,
516 		.sin6_addr = inp->in6p_laddr,
517 	};
518 	/* XXX: should catch errors */
519 	(void)sa6_recoverscope((struct sockaddr_in6 *)sa);
520 
521 	return (0);
522 }
523 
524 int
525 in6_getpeeraddr(struct socket *so, struct sockaddr *sa)
526 {
527 	struct inpcb *inp;
528 
529 	inp = sotoinpcb(so);
530 	KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
531 
532 	*(struct sockaddr_in6 *)sa = (struct sockaddr_in6 ){
533 		.sin6_len = sizeof(struct sockaddr_in6),
534 		.sin6_family = AF_INET6,
535 		.sin6_port = inp->inp_fport,
536 		.sin6_addr = inp->in6p_faddr,
537 	};
538 	/* XXX: should catch errors */
539 	(void)sa6_recoverscope((struct sockaddr_in6 *)sa);
540 
541 	return (0);
542 }
543 
544 int
545 in6_mapped_sockaddr(struct socket *so, struct sockaddr *sa)
546 {
547 	int	error;
548 #ifdef INET
549 	struct	inpcb *inp;
550 
551 	inp = sotoinpcb(so);
552 	KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
553 
554 	if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
555 		struct sockaddr_in sin;
556 
557 		error = in_getsockaddr(so, (struct sockaddr *)&sin);
558 		if (error == 0)
559 			in6_sin_2_v4mapsin6(&sin, (struct sockaddr_in6 *)sa);
560 	} else
561 #endif
562 	{
563 		/* scope issues will be handled in in6_getsockaddr(). */
564 		error = in6_getsockaddr(so, sa);
565 	}
566 
567 	return error;
568 }
569 
570 int
571 in6_mapped_peeraddr(struct socket *so, struct sockaddr *sa)
572 {
573 	int	error;
574 #ifdef INET
575 	struct	inpcb *inp;
576 
577 	inp = sotoinpcb(so);
578 	KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
579 
580 	if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
581 		struct sockaddr_in sin;
582 
583 		error = in_getpeeraddr(so, (struct sockaddr *)&sin);
584 		if (error == 0)
585 			in6_sin_2_v4mapsin6(&sin, (struct sockaddr_in6 *)sa);
586 	} else
587 #endif
588 	{
589 		/* scope issues will be handled in in6_getpeeraddr(). */
590 		error = in6_getpeeraddr(so, sa);
591 	}
592 
593 	return error;
594 }
595 
596 /*
597  * Pass some notification to all connections of a protocol
598  * associated with address dst.  The local address and/or port numbers
599  * may be specified to limit the search.  The "usual action" will be
600  * taken, depending on the ctlinput cmd.  The caller must filter any
601  * cmds that are uninteresting (e.g., no error in the map).
602  * Call the protocol specific routine (if any) to report
603  * any errors for each matching socket.
604  */
605 static bool
606 inp_match6(const struct inpcb *inp, void *v __unused)
607 {
608 
609 	return ((inp->inp_vflag & INP_IPV6) != 0);
610 }
611 
612 void
613 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr_in6 *sa6_dst,
614     u_int fport_arg, const struct sockaddr_in6 *src, u_int lport_arg,
615     int errno, void *cmdarg,
616     struct inpcb *(*notify)(struct inpcb *, int))
617 {
618 	struct inpcb_iterator inpi = INP_ITERATOR(pcbinfo, INPLOOKUP_WLOCKPCB,
619 	    inp_match6, NULL);
620 	struct inpcb *inp;
621 	struct sockaddr_in6 sa6_src;
622 	u_short	fport = fport_arg, lport = lport_arg;
623 	u_int32_t flowinfo;
624 
625 	if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
626 		return;
627 
628 	/*
629 	 * note that src can be NULL when we get notify by local fragmentation.
630 	 */
631 	sa6_src = (src == NULL) ? sa6_any : *src;
632 	flowinfo = sa6_src.sin6_flowinfo;
633 
634 	while ((inp = inp_next(&inpi)) != NULL) {
635 		INP_WLOCK_ASSERT(inp);
636 		/*
637 		 * If the error designates a new path MTU for a destination
638 		 * and the application (associated with this socket) wanted to
639 		 * know the value, notify.
640 		 * XXX: should we avoid to notify the value to TCP sockets?
641 		 */
642 		if (errno == EMSGSIZE && cmdarg != NULL)
643 			ip6_notify_pmtu(inp, sa6_dst, *(uint32_t *)cmdarg);
644 
645 		/*
646 		 * Detect if we should notify the error. If no source and
647 		 * destination ports are specified, but non-zero flowinfo and
648 		 * local address match, notify the error. This is the case
649 		 * when the error is delivered with an encrypted buffer
650 		 * by ESP. Otherwise, just compare addresses and ports
651 		 * as usual.
652 		 */
653 		if (lport == 0 && fport == 0 && flowinfo &&
654 		    inp->inp_socket != NULL &&
655 		    flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
656 		    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
657 			goto do_notify;
658 		else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
659 					     &sa6_dst->sin6_addr) ||
660 			 inp->inp_socket == 0 ||
661 			 (lport && inp->inp_lport != lport) ||
662 			 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
663 			  !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
664 					      &sa6_src.sin6_addr)) ||
665 			 (fport && inp->inp_fport != fport)) {
666 			continue;
667 		}
668 
669 	  do_notify:
670 		if (notify)
671 			(*notify)(inp, errno);
672 	}
673 }
674 
675 /*
676  * Lookup a PCB based on the local address and port.  Caller must hold the
677  * hash lock.  No inpcb locks or references are acquired.
678  */
679 struct inpcb *
680 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
681     u_short lport, int lookupflags, struct ucred *cred)
682 {
683 	struct inpcb *inp;
684 	int matchwild = 3, wildcard;
685 
686 	KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
687 	    ("%s: invalid lookup flags %d", __func__, lookupflags));
688 
689 	INP_HASH_LOCK_ASSERT(pcbinfo);
690 
691 	if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
692 		struct inpcbhead *head;
693 		/*
694 		 * Look for an unconnected (wildcard foreign addr) PCB that
695 		 * matches the local address and port we're looking for.
696 		 */
697 		head = &pcbinfo->ipi_hash_wild[INP_PCBHASH_WILD(lport,
698 		    pcbinfo->ipi_hashmask)];
699 		CK_LIST_FOREACH(inp, head, inp_hash_wild) {
700 			/* XXX inp locking */
701 			if ((inp->inp_vflag & INP_IPV6) == 0)
702 				continue;
703 			if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
704 			    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
705 			    inp->inp_lport == lport) {
706 				/* Found. */
707 				if (prison_equal_ip6(cred->cr_prison,
708 				    inp->inp_cred->cr_prison))
709 					return (inp);
710 			}
711 		}
712 		/*
713 		 * Not found.
714 		 */
715 		return (NULL);
716 	} else {
717 		struct inpcbporthead *porthash;
718 		struct inpcbport *phd;
719 		struct inpcb *match = NULL;
720 		/*
721 		 * Best fit PCB lookup.
722 		 *
723 		 * First see if this local port is in use by looking on the
724 		 * port hash list.
725 		 */
726 		porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
727 		    pcbinfo->ipi_porthashmask)];
728 		CK_LIST_FOREACH(phd, porthash, phd_hash) {
729 			if (phd->phd_port == lport)
730 				break;
731 		}
732 		if (phd != NULL) {
733 			/*
734 			 * Port is in use by one or more PCBs. Look for best
735 			 * fit.
736 			 */
737 			CK_LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
738 				wildcard = 0;
739 				if (!prison_equal_ip6(cred->cr_prison,
740 				    inp->inp_cred->cr_prison))
741 					continue;
742 				/* XXX inp locking */
743 				if ((inp->inp_vflag & INP_IPV6) == 0)
744 					continue;
745 				if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
746 					wildcard++;
747 				if (!IN6_IS_ADDR_UNSPECIFIED(
748 					&inp->in6p_laddr)) {
749 					if (IN6_IS_ADDR_UNSPECIFIED(laddr))
750 						wildcard++;
751 					else if (!IN6_ARE_ADDR_EQUAL(
752 					    &inp->in6p_laddr, laddr))
753 						continue;
754 				} else {
755 					if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
756 						wildcard++;
757 				}
758 				if (wildcard < matchwild) {
759 					match = inp;
760 					matchwild = wildcard;
761 					if (matchwild == 0)
762 						break;
763 				}
764 			}
765 		}
766 		return (match);
767 	}
768 }
769 
770 static bool
771 in6_multi_match(const struct inpcb *inp, void *v __unused)
772 {
773 
774 	if ((inp->inp_vflag & INP_IPV6) && inp->in6p_moptions != NULL)
775 		return (true);
776 	else
777 		return (false);
778 }
779 
780 void
781 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
782 {
783 	struct inpcb_iterator inpi = INP_ITERATOR(pcbinfo, INPLOOKUP_RLOCKPCB,
784 	    in6_multi_match, NULL);
785 	struct inpcb *inp;
786 	struct in6_multi *inm;
787 	struct in6_mfilter *imf;
788 	struct ip6_moptions *im6o;
789 
790 	IN6_MULTI_LOCK_ASSERT();
791 
792 	while ((inp = inp_next(&inpi)) != NULL) {
793 		INP_RLOCK_ASSERT(inp);
794 
795 		im6o = inp->in6p_moptions;
796 		/*
797 		 * Unselect the outgoing ifp for multicast if it
798 		 * is being detached.
799 		 */
800 		if (im6o->im6o_multicast_ifp == ifp)
801 			im6o->im6o_multicast_ifp = NULL;
802 		/*
803 		 * Drop multicast group membership if we joined
804 		 * through the interface being detached.
805 		 */
806 restart:
807 		IP6_MFILTER_FOREACH(imf, &im6o->im6o_head) {
808 			if ((inm = imf->im6f_in6m) == NULL)
809 				continue;
810 			if (inm->in6m_ifp != ifp)
811 				continue;
812 			ip6_mfilter_remove(&im6o->im6o_head, imf);
813 			in6_leavegroup_locked(inm, NULL);
814 			ip6_mfilter_free(imf);
815 			goto restart;
816 		}
817 	}
818 }
819 
820 /*
821  * Check for alternatives when higher level complains
822  * about service problems.  For now, invalidate cached
823  * routing information.  If the route was created dynamically
824  * (by a redirect), time to try a default gateway again.
825  */
826 void
827 in6_losing(struct inpcb *inp)
828 {
829 
830 	RO_INVALIDATE_CACHE(&inp->inp_route6);
831 }
832 
833 /*
834  * After a routing change, flush old routing
835  * and allocate a (hopefully) better one.
836  */
837 struct inpcb *
838 in6_rtchange(struct inpcb *inp, int errno __unused)
839 {
840 
841 	RO_INVALIDATE_CACHE(&inp->inp_route6);
842 	return inp;
843 }
844 
845 static bool
846 in6_pcblookup_lb_numa_match(const struct inpcblbgroup *grp, int domain)
847 {
848 	return (domain == M_NODOM || domain == grp->il_numa_domain);
849 }
850 
851 static struct inpcb *
852 in6_pcblookup_lbgroup(const struct inpcbinfo *pcbinfo,
853     const struct in6_addr *faddr, uint16_t fport, const struct in6_addr *laddr,
854     uint16_t lport, uint8_t domain)
855 {
856 	const struct inpcblbgrouphead *hdr;
857 	struct inpcblbgroup *grp;
858 	struct inpcblbgroup *jail_exact, *jail_wild, *local_exact, *local_wild;
859 
860 	INP_HASH_LOCK_ASSERT(pcbinfo);
861 
862 	hdr = &pcbinfo->ipi_lbgrouphashbase[
863 	    INP_PCBPORTHASH(lport, pcbinfo->ipi_lbgrouphashmask)];
864 
865 	/*
866 	 * Search for an LB group match based on the following criteria:
867 	 * - prefer jailed groups to non-jailed groups
868 	 * - prefer exact source address matches to wildcard matches
869 	 * - prefer groups bound to the specified NUMA domain
870 	 */
871 	jail_exact = jail_wild = local_exact = local_wild = NULL;
872 	CK_LIST_FOREACH(grp, hdr, il_list) {
873 		bool injail;
874 
875 #ifdef INET
876 		if (!(grp->il_vflag & INP_IPV6))
877 			continue;
878 #endif
879 		if (grp->il_lport != lport)
880 			continue;
881 
882 		injail = prison_flag(grp->il_cred, PR_IP6) != 0;
883 		if (injail && prison_check_ip6_locked(grp->il_cred->cr_prison,
884 		    laddr) != 0)
885 			continue;
886 
887 		if (IN6_ARE_ADDR_EQUAL(&grp->il6_laddr, laddr)) {
888 			if (injail) {
889 				jail_exact = grp;
890 				if (in6_pcblookup_lb_numa_match(grp, domain))
891 					/* This is a perfect match. */
892 					goto out;
893 			} else if (local_exact == NULL ||
894 			    in6_pcblookup_lb_numa_match(grp, domain)) {
895 				local_exact = grp;
896 			}
897 		} else if (IN6_IS_ADDR_UNSPECIFIED(&grp->il6_laddr)) {
898 			if (injail) {
899 				if (jail_wild == NULL ||
900 				    in6_pcblookup_lb_numa_match(grp, domain))
901 					jail_wild = grp;
902 			} else if (local_wild == NULL ||
903 			    in6_pcblookup_lb_numa_match(grp, domain)) {
904 				local_wild = grp;
905 			}
906 		}
907 	}
908 
909 	if (jail_exact != NULL)
910 		grp = jail_exact;
911 	else if (jail_wild != NULL)
912 		grp = jail_wild;
913 	else if (local_exact != NULL)
914 		grp = local_exact;
915 	else
916 		grp = local_wild;
917 	if (grp == NULL)
918 		return (NULL);
919 out:
920 	return (grp->il_inp[INP6_PCBLBGROUP_PKTHASH(faddr, lport, fport) %
921 	    grp->il_inpcnt]);
922 }
923 
924 static bool
925 in6_pcblookup_exact_match(const struct inpcb *inp, const struct in6_addr *faddr,
926     u_short fport, const struct in6_addr *laddr, u_short lport)
927 {
928 	/* XXX inp locking */
929 	if ((inp->inp_vflag & INP_IPV6) == 0)
930 		return (false);
931 	if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
932 	    IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
933 	    inp->inp_fport == fport && inp->inp_lport == lport)
934 		return (true);
935 	return (false);
936 }
937 
938 static struct inpcb *
939 in6_pcblookup_hash_exact(struct inpcbinfo *pcbinfo,
940     const struct in6_addr *faddr, u_short fport,
941     const struct in6_addr *laddr, u_short lport)
942 {
943 	struct inpcbhead *head;
944 	struct inpcb *inp;
945 
946 	INP_HASH_LOCK_ASSERT(pcbinfo);
947 
948 	/*
949 	 * First look for an exact match.
950 	 */
951 	head = &pcbinfo->ipi_hash_exact[INP6_PCBHASH(faddr, lport, fport,
952 	    pcbinfo->ipi_hashmask)];
953 	CK_LIST_FOREACH(inp, head, inp_hash_exact) {
954 		if (in6_pcblookup_exact_match(inp, faddr, fport, laddr, lport))
955 			return (inp);
956 	}
957 	return (NULL);
958 }
959 
960 typedef enum {
961 	INPLOOKUP_MATCH_NONE = 0,
962 	INPLOOKUP_MATCH_WILD = 1,
963 	INPLOOKUP_MATCH_LADDR = 2,
964 } inp_lookup_match_t;
965 
966 static inp_lookup_match_t
967 in6_pcblookup_wild_match(const struct inpcb *inp, const struct in6_addr *laddr,
968     u_short lport)
969 {
970 	/* XXX inp locking */
971 	if ((inp->inp_vflag & INP_IPV6) == 0)
972 		return (INPLOOKUP_MATCH_NONE);
973 	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
974 	    inp->inp_lport != lport)
975 		return (INPLOOKUP_MATCH_NONE);
976 	if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
977 		return (INPLOOKUP_MATCH_WILD);
978 	if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr))
979 		return (INPLOOKUP_MATCH_LADDR);
980 	return (INPLOOKUP_MATCH_NONE);
981 }
982 
983 #define	INP_LOOKUP_AGAIN	((struct inpcb *)(uintptr_t)-1)
984 
985 static struct inpcb *
986 in6_pcblookup_hash_wild_smr(struct inpcbinfo *pcbinfo,
987     const struct in6_addr *faddr, u_short fport, const struct in6_addr *laddr,
988     u_short lport, const inp_lookup_t lockflags)
989 {
990 	struct inpcbhead *head;
991 	struct inpcb *inp;
992 
993 	KASSERT(SMR_ENTERED(pcbinfo->ipi_smr),
994 	    ("%s: not in SMR read section", __func__));
995 
996 	head = &pcbinfo->ipi_hash_wild[INP_PCBHASH_WILD(lport,
997 	    pcbinfo->ipi_hashmask)];
998 	CK_LIST_FOREACH(inp, head, inp_hash_wild) {
999 		inp_lookup_match_t match;
1000 
1001 		match = in6_pcblookup_wild_match(inp, laddr, lport);
1002 		if (match == INPLOOKUP_MATCH_NONE)
1003 			continue;
1004 
1005 		if (__predict_true(inp_smr_lock(inp, lockflags))) {
1006 			match = in6_pcblookup_wild_match(inp, laddr, lport);
1007 			if (match != INPLOOKUP_MATCH_NONE &&
1008 			    prison_check_ip6_locked(inp->inp_cred->cr_prison,
1009 			    laddr) == 0)
1010 				return (inp);
1011 			inp_unlock(inp, lockflags);
1012 		}
1013 
1014 		/*
1015 		 * The matching socket disappeared out from under us.  Fall back
1016 		 * to a serialized lookup.
1017 		 */
1018 		return (INP_LOOKUP_AGAIN);
1019 	}
1020 	return (NULL);
1021 }
1022 
1023 static struct inpcb *
1024 in6_pcblookup_hash_wild_locked(struct inpcbinfo *pcbinfo,
1025     const struct in6_addr *faddr, u_short fport, const struct in6_addr *laddr,
1026     u_short lport)
1027 {
1028 	struct inpcbhead *head;
1029 	struct inpcb *inp, *jail_wild, *local_exact, *local_wild;
1030 
1031 	INP_HASH_LOCK_ASSERT(pcbinfo);
1032 
1033 	/*
1034 	 * Order of socket selection - we always prefer jails.
1035 	 *      1. jailed, non-wild.
1036 	 *      2. jailed, wild.
1037 	 *      3. non-jailed, non-wild.
1038 	 *      4. non-jailed, wild.
1039 	 */
1040 	head = &pcbinfo->ipi_hash_wild[INP_PCBHASH_WILD(lport,
1041 	    pcbinfo->ipi_hashmask)];
1042 	local_wild = local_exact = jail_wild = NULL;
1043 	CK_LIST_FOREACH(inp, head, inp_hash_wild) {
1044 		inp_lookup_match_t match;
1045 		bool injail;
1046 
1047 		match = in6_pcblookup_wild_match(inp, laddr, lport);
1048 		if (match == INPLOOKUP_MATCH_NONE)
1049 			continue;
1050 
1051 		injail = prison_flag(inp->inp_cred, PR_IP6) != 0;
1052 		if (injail) {
1053 			if (prison_check_ip6_locked(
1054 			    inp->inp_cred->cr_prison, laddr) != 0)
1055 				continue;
1056 		} else {
1057 			if (local_exact != NULL)
1058 				continue;
1059 		}
1060 
1061 		if (match == INPLOOKUP_MATCH_LADDR) {
1062 			if (injail)
1063 				return (inp);
1064 			else
1065 				local_exact = inp;
1066 		} else {
1067 			if (injail)
1068 				jail_wild = inp;
1069 			else
1070 				local_wild = inp;
1071 		}
1072 	}
1073 
1074 	if (jail_wild != NULL)
1075 		return (jail_wild);
1076 	if (local_exact != NULL)
1077 		return (local_exact);
1078 	if (local_wild != NULL)
1079 		return (local_wild);
1080 	return (NULL);
1081 }
1082 
1083 struct inpcb *
1084 in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo,
1085     const struct in6_addr *faddr, u_int fport_arg,
1086     const struct in6_addr *laddr, u_int lport_arg,
1087     int lookupflags, uint8_t numa_domain)
1088 {
1089 	struct inpcb *inp;
1090 	u_short fport = fport_arg, lport = lport_arg;
1091 
1092 	KASSERT((lookupflags & ~INPLOOKUP_WILDCARD) == 0,
1093 	    ("%s: invalid lookup flags %d", __func__, lookupflags));
1094 	KASSERT(!IN6_IS_ADDR_UNSPECIFIED(faddr),
1095 	    ("%s: invalid foreign address", __func__));
1096 	KASSERT(!IN6_IS_ADDR_UNSPECIFIED(laddr),
1097 	    ("%s: invalid local address", __func__));
1098 	INP_HASH_LOCK_ASSERT(pcbinfo);
1099 
1100 	inp = in6_pcblookup_hash_exact(pcbinfo, faddr, fport, laddr, lport);
1101 	if (inp != NULL)
1102 		return (inp);
1103 
1104 	if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1105 		inp = in6_pcblookup_lbgroup(pcbinfo, faddr, fport, laddr,
1106 		    lport, numa_domain);
1107 		if (inp == NULL) {
1108 			inp = in6_pcblookup_hash_wild_locked(pcbinfo, faddr,
1109 			    fport, laddr, lport);
1110 		}
1111 	}
1112 	return (inp);
1113 }
1114 
1115 static struct inpcb *
1116 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, const struct in6_addr *faddr,
1117     u_int fport, const struct in6_addr *laddr, u_int lport, int lookupflags,
1118     uint8_t numa_domain)
1119 {
1120 	struct inpcb *inp;
1121 	const inp_lookup_t lockflags = lookupflags & INPLOOKUP_LOCKMASK;
1122 
1123 	KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1124 	    ("%s: LOCKPCB not set", __func__));
1125 
1126 	INP_HASH_WLOCK(pcbinfo);
1127 	inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1128 	    lookupflags & ~INPLOOKUP_LOCKMASK, numa_domain);
1129 	if (inp != NULL && !inp_trylock(inp, lockflags)) {
1130 		in_pcbref(inp);
1131 		INP_HASH_WUNLOCK(pcbinfo);
1132 		inp_lock(inp, lockflags);
1133 		if (in_pcbrele(inp, lockflags))
1134 			/* XXX-MJ or retry until we get a negative match? */
1135 			inp = NULL;
1136 	} else {
1137 		INP_HASH_WUNLOCK(pcbinfo);
1138 	}
1139 	return (inp);
1140 }
1141 
1142 static struct inpcb *
1143 in6_pcblookup_hash_smr(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1144     u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, int lookupflags,
1145     uint8_t numa_domain)
1146 {
1147 	struct inpcb *inp;
1148 	const inp_lookup_t lockflags = lookupflags & INPLOOKUP_LOCKMASK;
1149 	const u_short fport = fport_arg, lport = lport_arg;
1150 
1151 	KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1152 	    ("%s: invalid lookup flags %d", __func__, lookupflags));
1153 	KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1154 	    ("%s: LOCKPCB not set", __func__));
1155 
1156 	smr_enter(pcbinfo->ipi_smr);
1157 	inp = in6_pcblookup_hash_exact(pcbinfo, faddr, fport, laddr, lport);
1158 	if (inp != NULL) {
1159 		if (__predict_true(inp_smr_lock(inp, lockflags))) {
1160 			if (__predict_true(in6_pcblookup_exact_match(inp,
1161 			    faddr, fport, laddr, lport)))
1162 				return (inp);
1163 			inp_unlock(inp, lockflags);
1164 		}
1165 		/*
1166 		 * We failed to lock the inpcb, or its connection state changed
1167 		 * out from under us.  Fall back to a precise search.
1168 		 */
1169 		return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1170 		    lookupflags, numa_domain));
1171 	}
1172 
1173 	if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1174 		inp = in6_pcblookup_lbgroup(pcbinfo, faddr, fport,
1175 		    laddr, lport, numa_domain);
1176 		if (inp != NULL) {
1177 			if (__predict_true(inp_smr_lock(inp, lockflags))) {
1178 				if (__predict_true(in6_pcblookup_wild_match(inp,
1179 				    laddr, lport) != INPLOOKUP_MATCH_NONE))
1180 					return (inp);
1181 				inp_unlock(inp, lockflags);
1182 			}
1183 			inp = INP_LOOKUP_AGAIN;
1184 		} else {
1185 			inp = in6_pcblookup_hash_wild_smr(pcbinfo, faddr, fport,
1186 			    laddr, lport, lockflags);
1187 		}
1188 		if (inp == INP_LOOKUP_AGAIN) {
1189 			return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr,
1190 			    lport, lookupflags, numa_domain));
1191 		}
1192 	}
1193 
1194 	if (inp == NULL)
1195 		smr_exit(pcbinfo->ipi_smr);
1196 
1197 	return (inp);
1198 }
1199 
1200 /*
1201  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1202  * from which a pre-calculated hash value may be extracted.
1203  */
1204 struct inpcb *
1205 in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
1206     struct in6_addr *laddr, u_int lport, int lookupflags,
1207     struct ifnet *ifp __unused)
1208 {
1209 	return (in6_pcblookup_hash_smr(pcbinfo, faddr, fport, laddr, lport,
1210 	    lookupflags, M_NODOM));
1211 }
1212 
1213 struct inpcb *
1214 in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1215     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1216     struct ifnet *ifp __unused, struct mbuf *m)
1217 {
1218 	return (in6_pcblookup_hash_smr(pcbinfo, faddr, fport, laddr, lport,
1219 	    lookupflags, m->m_pkthdr.numa_domain));
1220 }
1221 
1222 void
1223 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m, int srcordst)
1224 {
1225 	struct ip6_hdr *ip;
1226 
1227 	ip = mtod(m, struct ip6_hdr *);
1228 	bzero(sin6, sizeof(*sin6));
1229 	sin6->sin6_len = sizeof(*sin6);
1230 	sin6->sin6_family = AF_INET6;
1231 	sin6->sin6_addr = srcordst ? ip->ip6_dst : ip->ip6_src;
1232 
1233 	(void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
1234 
1235 	return;
1236 }
1237