1 /* $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam Exp $ */
2 /* $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33
34 /*
35 * Copyright (c) 1982, 1986, 1991, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
63 */
64
65 #include "opt_inet.h"
66 #include "opt_inet6.h"
67
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/malloc.h>
71 #include <sys/mbuf.h>
72 #include <sys/domain.h>
73 #include <sys/protosw.h>
74 #include <sys/socket.h>
75 #include <sys/socketvar.h>
76 #include <sys/sockio.h>
77 #include <sys/errno.h>
78 #include <sys/time.h>
79 #include <sys/proc.h>
80 #include <sys/caps.h>
81 #include <sys/jail.h>
82
83 #include <sys/msgport2.h>
84
85 #include <vm/vm_zone.h>
86
87 #include <net/if.h>
88 #include <net/if_types.h>
89 #include <net/route.h>
90 #include <net/netisr2.h>
91
92 #include <netinet/in.h>
93 #include <netinet/in_var.h>
94 #include <netinet/in_systm.h>
95 #include <netinet/ip6.h>
96 #include <netinet/ip_var.h>
97 #include <netinet6/ip6_var.h>
98 #include <netinet6/nd6.h>
99 #include <netinet/in_pcb.h>
100 #include <netinet6/in6_pcb.h>
101
102 struct in6_addr zeroin6_addr;
103
104 int
in6_pcbbind(struct inpcb * inp,struct sockaddr * nam,struct thread * td)105 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
106 {
107 struct socket *so = inp->inp_socket;
108 struct sockaddr_in6 jsin6;
109 int error;
110
111 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
112 return (EINVAL);
113
114 if (nam) {
115 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
116 struct inpcbinfo *pcbinfo;
117 struct inpcbportinfo *portinfo;
118 struct inpcbporthead *porthash;
119 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
120 struct ucred *cred = NULL;
121 struct inpcb *t;
122 u_short lport, lport_ho;
123
124 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
125 wild = 1;
126 if (td->td_proc != NULL)
127 cred = td->td_proc->p_ucred;
128
129 if (nam->sa_len != sizeof(*sin6))
130 return (EINVAL);
131 /*
132 * family check.
133 */
134 if (nam->sa_family != AF_INET6)
135 return (EAFNOSUPPORT);
136
137 /* Reject v4-mapped address */
138 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
139 return (EADDRNOTAVAIL);
140
141 if (!prison_replace_wildcards(td, nam))
142 return (EINVAL);
143
144 /* KAME hack: embed scopeid */
145 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
146 return (EINVAL);
147 /* this must be cleared for ifa_ifwithaddr() */
148 sin6->sin6_scope_id = 0;
149
150 lport = sin6->sin6_port;
151 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
152 /*
153 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
154 * allow compepte duplication of binding if
155 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
156 * and a multicast address is bound on both
157 * new and duplicated sockets.
158 */
159 if (so->so_options & SO_REUSEADDR)
160 reuseport = SO_REUSEADDR|SO_REUSEPORT;
161 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
162 struct ifaddr *ia = NULL;
163
164 sin6->sin6_port = 0; /* yech... */
165 if (!prison_replace_wildcards(td, (struct sockaddr *)sin6)) {
166 sin6->sin6_addr = kin6addr_any;
167 return (EINVAL);
168 }
169 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == NULL)
170 return (EADDRNOTAVAIL);
171
172 /*
173 * XXX: bind to an anycast address might accidentally
174 * cause sending a packet with anycast source address.
175 * We should allow to bind to a deprecated address, since
176 * the application dares to use it.
177 */
178 if (ia &&
179 ((struct in6_ifaddr *)ia)->ia6_flags &
180 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED))
181 return (EADDRNOTAVAIL);
182 }
183
184 inp->in6p_laddr = sin6->sin6_addr;
185
186 if (lport == 0)
187 goto auto_select;
188 lport_ho = ntohs(lport);
189
190 /* GROSS */
191 if (lport_ho < IPV6PORT_RESERVED && cred &&
192 caps_priv_check(cred, SYSCAP_NONET_RESPORT))
193 {
194 inp->in6p_laddr = kin6addr_any;
195 return (EACCES);
196 }
197
198 /*
199 * Locate the proper portinfo based on lport
200 */
201 pcbinfo = inp->inp_pcbinfo;
202 portinfo =
203 &pcbinfo->portinfo[lport_ho % pcbinfo->portinfo_cnt];
204 KKASSERT((lport_ho % pcbinfo->portinfo_cnt) ==
205 portinfo->offset);
206
207 /*
208 * This has to be atomic. If the porthash is shared across
209 * multiple protocol threads (aka tcp) then the token must
210 * be held.
211 */
212 porthash = in_pcbporthash_head(portinfo, lport);
213 GET_PORTHASH_TOKEN(porthash);
214
215 if (so->so_cred->cr_uid != 0 &&
216 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
217 t = in6_pcblookup_local(porthash, &sin6->sin6_addr,
218 lport, INPLOOKUP_WILDCARD,
219 cred);
220 if (t &&
221 (so->so_cred->cr_uid !=
222 t->inp_socket->so_cred->cr_uid)) {
223 inp->in6p_laddr = kin6addr_any;
224 error = EADDRINUSE;
225 goto done;
226 }
227 }
228 if (cred && cred->cr_prison &&
229 !prison_replace_wildcards(td, nam)) {
230 inp->in6p_laddr = kin6addr_any;
231 error = EADDRNOTAVAIL;
232 goto done;
233 }
234 t = in6_pcblookup_local(porthash, &sin6->sin6_addr, lport,
235 wild, cred);
236 if (t && (reuseport & t->inp_socket->so_options) == 0) {
237 inp->in6p_laddr = kin6addr_any;
238 error = EADDRINUSE;
239 goto done;
240 }
241
242 inp->inp_lport = lport;
243 in_pcbinsporthash(porthash, inp);
244 error = 0;
245 done:
246 REL_PORTHASH_TOKEN(porthash);
247 return (error);
248 } else {
249 auto_select:
250 jsin6.sin6_addr = inp->in6p_laddr;
251 jsin6.sin6_family = AF_INET6;
252 if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin6)) {
253 inp->in6p_laddr = kin6addr_any;
254 inp->inp_lport = 0;
255 return (EINVAL);
256 }
257
258 return in6_pcbsetlport(&inp->in6p_laddr, inp, td);
259 }
260 }
261
262 /*
263 * Transform old in6_pcbconnect() into an inner subroutine for new
264 * in6_pcbconnect(): Do some validity-checking on the remote
265 * address (in mbuf 'nam') and then determine local host address
266 * (i.e., which interface) to use to access that remote host.
267 *
268 * This preserves definition of in6_pcbconnect(), while supporting a
269 * slightly different version for T/TCP. (This is more than
270 * a bit of a kludge, but cleaning up the internal interfaces would
271 * have forced minor changes in every protocol).
272 */
273
274 int
in6_pcbladdr(struct inpcb * inp,struct sockaddr * nam,struct in6_addr ** plocal_addr6,struct thread * td)275 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
276 struct in6_addr **plocal_addr6, struct thread *td)
277 {
278 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
279 struct ifnet *ifp = NULL;
280 int error = 0;
281
282 if (nam->sa_len != sizeof (*sin6))
283 return (EINVAL);
284 if (sin6->sin6_family != AF_INET6)
285 return (EAFNOSUPPORT);
286 if (sin6->sin6_port == 0)
287 return (EADDRNOTAVAIL);
288
289 /* KAME hack: embed scopeid */
290 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
291 return EINVAL;
292
293 if (in6_ifaddr) {
294 /*
295 * If the destination address is UNSPECIFIED addr,
296 * use the loopback addr, e.g ::1.
297 */
298 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
299 sin6->sin6_addr = kin6addr_loopback;
300 }
301 {
302 /*
303 * XXX: in6_selectsrc might replace the bound local address
304 * with the address specified by setsockopt(IPV6_PKTINFO).
305 * Is it the intended behavior?
306 */
307 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
308 inp->in6p_moptions,
309 &inp->in6p_route,
310 &inp->in6p_laddr, &error, td);
311 if (*plocal_addr6 == NULL) {
312 if (error == 0)
313 error = EADDRNOTAVAIL;
314 return (error);
315 }
316 /*
317 * Don't do pcblookup call here; return interface in
318 * plocal_addr6
319 * and exit to caller, that will do the lookup.
320 */
321 }
322
323 if (inp->in6p_route.ro_rt)
324 ifp = inp->in6p_route.ro_rt->rt_ifp;
325
326 return (0);
327 }
328
329 /*
330 * Outer subroutine:
331 * Connect from a socket to a specified address.
332 * Both address and port must be specified in argument sin.
333 * If don't have a local address for this socket yet,
334 * then pick one.
335 */
336 int
in6_pcbconnect(struct inpcb * inp,struct sockaddr * nam,struct thread * td)337 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
338 {
339 struct in6_addr *addr6;
340 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
341 int error;
342
343 /* Reject v4-mapped address */
344 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
345 return EADDRNOTAVAIL;
346
347 /*
348 * Call inner routine, to assign local interface address.
349 * in6_pcbladdr() may automatically fill in sin6_scope_id.
350 */
351 if ((error = in6_pcbladdr(inp, nam, &addr6, td)) != 0)
352 return (error);
353
354 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
355 sin6->sin6_port,
356 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
357 ? addr6 : &inp->in6p_laddr,
358 inp->inp_lport, 0, NULL) != NULL) {
359 return (EADDRINUSE);
360 }
361 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
362 if (inp->inp_lport == 0) {
363 error = in6_pcbbind(inp, NULL, td);
364 if (error)
365 return (error);
366 }
367 inp->in6p_laddr = *addr6;
368 }
369 inp->in6p_faddr = sin6->sin6_addr;
370 inp->inp_fport = sin6->sin6_port;
371 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
372 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
373 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
374 inp->in6p_flowinfo |=
375 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
376
377 in_pcbinsconnhash(inp);
378 return (0);
379 }
380
381 void
in6_pcbdisconnect(struct inpcb * inp)382 in6_pcbdisconnect(struct inpcb *inp)
383 {
384 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
385 inp->inp_fport = 0;
386 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
387 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
388 in_pcbremconnhash(inp);
389 if (inp->inp_socket->so_state & SS_NOFDREF)
390 in6_pcbdetach(inp);
391 }
392
393 void
in6_pcbdetach(struct inpcb * inp)394 in6_pcbdetach(struct inpcb *inp)
395 {
396 struct socket *so = inp->inp_socket;
397 struct inpcbinfo *ipi = inp->inp_pcbinfo;
398
399 inp->inp_gencnt = ++ipi->ipi_gencnt;
400 in_pcbremlists(inp);
401 so->so_pcb = NULL;
402 KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
403 sofree(so); /* remove pcb ref */
404
405 if (inp->in6p_options)
406 m_freem(inp->in6p_options);
407 ip6_freepcbopts(inp->in6p_outputopts);
408 ip6_freemoptions(inp->in6p_moptions);
409 if (inp->in6p_route.ro_rt)
410 rtfree(inp->in6p_route.ro_rt);
411 /* Check and free IPv4 related resources in case of mapped addr */
412 if (inp->inp_options)
413 m_free(inp->inp_options);
414 ip_freemoptions(inp->inp_moptions);
415
416 kfree(inp, M_PCB);
417 }
418
419 /*
420 * The socket may have an invalid PCB, i.e. NULL. For example, a TCP
421 * socket received RST.
422 */
423 static int
in6_setsockaddr(struct socket * so,struct sockaddr ** nam)424 in6_setsockaddr(struct socket *so, struct sockaddr **nam)
425 {
426 struct inpcb *inp;
427 struct sockaddr_in6 *sin6;
428
429 KASSERT(curthread->td_type == TD_TYPE_NETISR, ("not in netisr"));
430 inp = so->so_pcb;
431 if (!inp)
432 return EINVAL;
433
434 sin6 = kmalloc(sizeof *sin6, M_SONAME, M_WAITOK | M_ZERO);
435 sin6->sin6_family = AF_INET6;
436 sin6->sin6_len = sizeof(*sin6);
437 sin6->sin6_port = inp->inp_lport;
438 sin6->sin6_addr = inp->in6p_laddr;
439 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
440 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
441 else
442 sin6->sin6_scope_id = 0; /*XXX*/
443 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
444 sin6->sin6_addr.s6_addr16[1] = 0;
445
446 *nam = (struct sockaddr *)sin6;
447 return 0;
448 }
449
450 void
in6_setsockaddr_dispatch(netmsg_t msg)451 in6_setsockaddr_dispatch(netmsg_t msg)
452 {
453 int error;
454
455 error = in6_setsockaddr(msg->sockaddr.base.nm_so, msg->sockaddr.nm_nam);
456 lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
457 }
458
459 void
in6_setpeeraddr_dispatch(netmsg_t msg)460 in6_setpeeraddr_dispatch(netmsg_t msg)
461 {
462 int error;
463
464 error = in6_setpeeraddr(msg->peeraddr.base.nm_so, msg->peeraddr.nm_nam);
465 lwkt_replymsg(&msg->peeraddr.base.lmsg, error);
466 }
467
468 /*
469 * The socket may have an invalid PCB, i.e. NULL. For example, a TCP
470 * socket received RST.
471 */
472 int
in6_setpeeraddr(struct socket * so,struct sockaddr ** nam)473 in6_setpeeraddr(struct socket *so, struct sockaddr **nam)
474 {
475 struct inpcb *inp;
476 struct sockaddr_in6 *sin6;
477
478 KASSERT(curthread->td_type == TD_TYPE_NETISR, ("not in netisr"));
479 inp = so->so_pcb;
480 if (!inp)
481 return EINVAL;
482
483 sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
484 sin6->sin6_family = AF_INET6;
485 sin6->sin6_len = sizeof(struct sockaddr_in6);
486 sin6->sin6_port = inp->inp_fport;
487 sin6->sin6_addr = inp->in6p_faddr;
488 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
489 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
490 else
491 sin6->sin6_scope_id = 0; /*XXX*/
492 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
493 sin6->sin6_addr.s6_addr16[1] = 0;
494
495 *nam = (struct sockaddr *)sin6;
496 return 0;
497 }
498
499 /*
500 * Pass some notification to all connections of a protocol
501 * associated with address dst. The local address and/or port numbers
502 * may be specified to limit the search. The "usual action" will be
503 * taken, depending on the ctlinput cmd. The caller must filter any
504 * cmds that are uninteresting (e.g., no error in the map).
505 * Call the protocol specific routine (if any) to report
506 * any errors for each matching socket.
507 */
508 void
in6_pcbnotify(struct inpcbinfo * pcbinfo,struct sockaddr * dst,in_port_t fport,const struct sockaddr * src,in_port_t lport,int cmd,int arg,inp_notify_t notify)509 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, in_port_t fport,
510 const struct sockaddr *src, in_port_t lport, int cmd, int arg,
511 inp_notify_t notify)
512 {
513 struct inpcb *inp, *marker;
514 struct sockaddr_in6 sa6_src, *sa6_dst;
515 u_int32_t flowinfo;
516
517 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
518 return;
519
520 sa6_dst = (struct sockaddr_in6 *)dst;
521 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
522 return;
523
524 /*
525 * note that src can be NULL when we get notify by local fragmentation.
526 */
527 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
528 flowinfo = sa6_src.sin6_flowinfo;
529
530 /*
531 * Redirects go to all references to the destination,
532 * and use in6_rtchange to invalidate the route cache.
533 * Dead host indications: also use in6_rtchange to invalidate
534 * the cache, and deliver the error to all the sockets.
535 * Otherwise, if we have knowledge of the local port and address,
536 * deliver only to that socket.
537 */
538 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
539 fport = 0;
540 lport = 0;
541 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
542
543 if (cmd != PRC_HOSTDEAD)
544 notify = in6_rtchange;
545 }
546 if (cmd != PRC_MSGSIZE)
547 arg = inet6ctlerrmap[cmd];
548
549 marker = in_pcbmarker();
550
551 GET_PCBINFO_TOKEN(pcbinfo);
552
553 LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
554 while ((inp = LIST_NEXT(marker, inp_list)) != NULL) {
555 LIST_REMOVE(marker, inp_list);
556 LIST_INSERT_AFTER(inp, marker, inp_list);
557
558 if (inp->inp_flags & INP_PLACEMARKER)
559 continue;
560
561 if (!INP_ISIPV6(inp))
562 continue;
563 /*
564 * If the error designates a new path MTU for a destination
565 * and the application (associated with this socket) wanted to
566 * know the value, notify. Note that we notify for all
567 * disconnected sockets if the corresponding application
568 * wanted. This is because some UDP applications keep sending
569 * sockets disconnected.
570 * XXX: should we avoid to notify the value to TCP sockets?
571 */
572 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
573 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
574 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
575 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, &arg);
576 }
577
578 /*
579 * Detect if we should notify the error. If no source and
580 * destination ports are specifed, but non-zero flowinfo and
581 * local address match, notify the error. This is the case
582 * when the error is delivered with an encrypted buffer
583 * by ESP. Otherwise, just compare addresses and ports
584 * as usual.
585 */
586 if (lport == 0 && fport == 0 && flowinfo &&
587 inp->inp_socket != NULL &&
588 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
589 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
590 goto do_notify;
591 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
592 &sa6_dst->sin6_addr) ||
593 inp->inp_socket == 0 ||
594 (lport && inp->inp_lport != lport) ||
595 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
596 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
597 &sa6_src.sin6_addr)) ||
598 (fport && inp->inp_fport != fport))
599 continue;
600
601 do_notify:
602 if (notify)
603 (*notify)(inp, arg);
604 }
605 LIST_REMOVE(marker, inp_list);
606
607 REL_PCBINFO_TOKEN(pcbinfo);
608 }
609
610 /*
611 * Lookup a PCB based on the local address and port.
612 */
613 struct inpcb *
in6_pcblookup_local(struct inpcbporthead * porthash,const struct in6_addr * laddr,u_int lport_arg,int wild_okay,struct ucred * cred)614 in6_pcblookup_local(struct inpcbporthead *porthash,
615 const struct in6_addr *laddr, u_int lport_arg, int wild_okay,
616 struct ucred *cred)
617 {
618 struct prison *pscan;
619 struct prison *pr;
620 struct inpcb *inp;
621 int matchwild = 3, wildcard;
622 u_short lport = lport_arg;
623 struct inpcbport *phd;
624 struct inpcb *match = NULL;
625
626 /*
627 * If the porthashbase is shared across several cpus, it must
628 * have been locked.
629 */
630 ASSERT_PORTHASH_TOKEN_HELD(porthash);
631
632 /*
633 * Best fit PCB lookup.
634 *
635 * First see if this local port is in use by looking on the
636 * port hash list.
637 */
638 LIST_FOREACH(phd, porthash, phd_hash) {
639 if (phd->phd_port == lport)
640 break;
641 }
642
643 if (phd != NULL) {
644 pr = cred ? cred->cr_prison : NULL;
645
646 /*
647 * Port is in use by one or more PCBs. Look for best
648 * fit.
649 */
650 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
651 wildcard = 0;
652 if (!INP_ISIPV6(inp))
653 continue;
654 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
655 wildcard++;
656
657 if (inp->inp_socket && inp->inp_socket->so_cred)
658 pscan = inp->inp_socket->so_cred->cr_prison;
659 else
660 pscan = NULL;
661 if (pr != pscan)
662 continue;
663
664 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
665 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
666 wildcard++;
667 } else {
668 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
669 wildcard++;
670 else if (!IN6_ARE_ADDR_EQUAL(
671 &inp->in6p_laddr, laddr))
672 continue;
673 }
674 if (wildcard && !wild_okay)
675 continue;
676 if (wildcard < matchwild) {
677 match = inp;
678 matchwild = wildcard;
679 if (wildcard == 0)
680 break;
681 }
682 }
683 }
684 return (match);
685 }
686
687 void
in6_pcbpurgeif0(struct inpcbinfo * pcbinfo,struct ifnet * ifp)688 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
689 {
690 struct in6pcb *in6p, *marker;
691 struct ip6_moptions *im6o;
692 struct in6_multi_mship *imm, *nimm;
693
694 /*
695 * We only need to make sure that we are in netisr0, where all
696 * multicast operation happen. We could check inpcbinfo which
697 * does not belong to netisr0 by holding the inpcbinfo's token.
698 * In this case, the pcbinfo must be able to be shared, i.e.
699 * pcbinfo->infotoken is not NULL.
700 */
701 ASSERT_NETISR0;
702 KASSERT(pcbinfo->cpu == 0 || pcbinfo->infotoken != NULL,
703 ("pcbinfo could not be shared"));
704
705 /*
706 * Get a marker for the current netisr (netisr0).
707 *
708 * It is possible that the multicast address deletion blocks,
709 * which could cause temporary token releasing. So we use
710 * inpcb marker here to get a coherent view of the inpcb list.
711 *
712 * While, on the other hand, moptions are only added and deleted
713 * in netisr0, so we would not see staled moption or miss moption
714 * even if the token was released due to the blocking multicast
715 * address deletion.
716 */
717 marker = in_pcbmarker();
718
719 GET_PCBINFO_TOKEN(pcbinfo);
720
721 LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
722 while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) {
723 LIST_REMOVE(marker, inp_list);
724 LIST_INSERT_AFTER(in6p, marker, inp_list);
725
726 if (in6p->in6p_flags & INP_PLACEMARKER)
727 continue;
728 im6o = in6p->in6p_moptions;
729 if (INP_ISIPV6(in6p) && im6o) {
730 /*
731 * Unselect the outgoing interface if it is being
732 * detached.
733 */
734 if (im6o->im6o_multicast_ifp == ifp)
735 im6o->im6o_multicast_ifp = NULL;
736
737 /*
738 * Drop multicast group membership if we joined
739 * through the interface being detached.
740 * XXX controversial - is it really legal for kernel
741 * to force this?
742 */
743 for (imm = im6o->im6o_memberships.lh_first;
744 imm != NULL; imm = nimm) {
745 nimm = imm->i6mm_chain.le_next;
746 if (imm->i6mm_maddr->in6m_ifp == ifp) {
747 LIST_REMOVE(imm, i6mm_chain);
748 in6_delmulti(imm->i6mm_maddr);
749 kfree(imm, M_IPMADDR);
750 }
751 }
752 }
753 }
754 LIST_REMOVE(marker, inp_list);
755
756 REL_PCBINFO_TOKEN(pcbinfo);
757 }
758
759 /*
760 * Check for alternatives when higher level complains
761 * about service problems. For now, invalidate cached
762 * routing information. If the route was created dynamically
763 * (by a redirect), time to try a default gateway again.
764 */
765 void
in6_losing(struct inpcb * in6p)766 in6_losing(struct inpcb *in6p)
767 {
768 struct rtentry *rt;
769 struct rt_addrinfo info;
770
771 if ((rt = in6p->in6p_route.ro_rt) != NULL) {
772 bzero((caddr_t)&info, sizeof(info));
773 info.rti_flags = rt->rt_flags;
774 info.rti_info[RTAX_DST] = rt_key(rt);
775 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
776 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
777 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
778 if (rt->rt_flags & RTF_DYNAMIC) {
779 rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
780 rt_mask(rt), rt->rt_flags, NULL);
781 }
782 in6p->in6p_route.ro_rt = NULL;
783 rtfree(rt);
784 /*
785 * A new route can be allocated
786 * the next time output is attempted.
787 */
788 }
789 }
790
791 /*
792 * After a routing change, flush old routing
793 * and allocate a (hopefully) better one.
794 */
795 void
in6_rtchange(struct inpcb * inp,int error)796 in6_rtchange(struct inpcb *inp, int error)
797 {
798 if (inp->in6p_route.ro_rt) {
799 rtfree(inp->in6p_route.ro_rt);
800 inp->in6p_route.ro_rt = 0;
801 /*
802 * A new route can be allocated the next time
803 * output is attempted.
804 */
805 }
806 }
807
808 /*
809 * Lookup PCB in hash list.
810 */
811 struct inpcb *
in6_pcblookup_hash(struct inpcbinfo * pcbinfo,struct in6_addr * faddr,u_int fport_arg,struct in6_addr * laddr,u_int lport_arg,int wildcard,struct ifnet * ifp)812 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
813 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
814 int wildcard, struct ifnet *ifp)
815 {
816 struct inpcbhead *head;
817 struct inpcb *inp;
818 struct inpcb *jinp = NULL;
819 u_short fport = fport_arg, lport = lport_arg;
820
821 /*
822 * First look for an exact match.
823 */
824 head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */,
825 fport,
826 laddr->s6_addr32[3], /* XXX JH */
827 lport,
828 pcbinfo->hashmask)];
829 LIST_FOREACH(inp, head, inp_hash) {
830 if (!INP_ISIPV6(inp))
831 continue;
832 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
833 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
834 inp->inp_fport == fport &&
835 inp->inp_lport == lport) {
836 /*
837 * Found.
838 */
839 if (inp->inp_socket == NULL ||
840 inp->inp_socket->so_cred->cr_prison == NULL) {
841 return (inp);
842 }
843 if (jinp == NULL)
844 jinp = inp;
845 }
846 }
847 if (jinp != NULL)
848 return(jinp);
849
850 if (wildcard) {
851 struct inpcb *local_wild = NULL;
852 struct inpcb *jinp_wild = NULL;
853 struct inpcontainer *ic;
854 struct inpcontainerhead *chead;
855 struct sockaddr_in6 jsin6;
856 struct ucred *cred;
857 struct prison *pr;
858 int net_listen_ov_local = 0;
859 int net_listen_ov_wild = 0;
860
861 /*
862 * Order of socket selection:
863 * 1. non-jailed, non-wild.
864 * 2. non-jailed, wild. (allow_listen_override on)
865 * 3. jailed, non-wild.
866 * 4. jailed, wild.
867 * 5. non-jailed, wild. (allow_listen_override off)
868 *
869 * NOTE: jailed wildcards are still restricted to the jail
870 * IPs.
871 *
872 * NOTE: (1) and (3) already handled above.
873 */
874 jsin6.sin6_family = AF_INET6;
875 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport,
876 pcbinfo->wildcardhashmask)];
877
878 GET_PCBINFO_TOKEN(pcbinfo);
879 LIST_FOREACH(ic, chead, ic_list) {
880 inp = ic->ic_inp;
881 if (inp->inp_flags & INP_PLACEMARKER)
882 continue;
883
884 /*
885 * Basdic validation
886 */
887 if (!INP_ISIPV6(inp))
888 continue;
889 if (inp->inp_lport != lport)
890 continue;
891
892 /*
893 * Calculate prison, setup jsin for jailed_ip()
894 * check.
895 */
896 jsin6.sin6_addr = *laddr;
897 pr = NULL;
898 cred = NULL;
899 if (inp->inp_socket) {
900 cred = inp->inp_socket->so_cred;
901 if (cred)
902 pr = cred->cr_prison;
903 }
904
905 /*
906 * Assign jinp, jinp_wild, and local_wild as
907 * appropriate, track whether the jail supports
908 * listen overrides.
909 */
910 if (pr) {
911 if (!jailed_ip(pr, (struct sockaddr *)&jsin6))
912 continue;
913 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)
914 && jinp == NULL) {
915 jinp = inp;
916 if (PRISON_CAP_ISSET(pr->pr_caps, PRISON_CAP_NET_LISTEN_OVERRIDE))
917 net_listen_ov_local = 1;
918 }
919 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
920 jinp_wild == NULL) {
921 jinp_wild = inp;
922 if (PRISON_CAP_ISSET(pr->pr_caps, PRISON_CAP_NET_LISTEN_OVERRIDE))
923 net_listen_ov_wild = 1;
924 }
925 } else {
926 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
927 REL_PCBINFO_TOKEN(pcbinfo);
928 return (inp);
929 }
930 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
931 local_wild = inp;
932 }
933 }
934 REL_PCBINFO_TOKEN(pcbinfo);
935
936 if (net_listen_ov_local)
937 return jinp;
938 if (net_listen_ov_wild)
939 return jinp_wild;
940 if (local_wild)
941 return local_wild;
942 if (jinp)
943 return jinp;
944 return (jinp_wild);
945 }
946
947 /*
948 * Not found.
949 */
950 return (NULL);
951 }
952
953 void
init_sin6(struct sockaddr_in6 * sin6,struct mbuf * m)954 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
955 {
956 struct ip6_hdr *ip;
957
958 ip = mtod(m, struct ip6_hdr *);
959 bzero(sin6, sizeof(*sin6));
960 sin6->sin6_len = sizeof(*sin6);
961 sin6->sin6_family = AF_INET6;
962 sin6->sin6_addr = ip->ip6_src;
963 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
964 sin6->sin6_addr.s6_addr16[1] = 0;
965 sin6->sin6_scope_id =
966 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
967 ? m->m_pkthdr.rcvif->if_index : 0;
968
969 return;
970 }
971
972 void
in6_savefaddr(struct socket * so,const struct sockaddr * faddr)973 in6_savefaddr(struct socket *so, const struct sockaddr *faddr)
974 {
975 struct sockaddr_in6 *sin6;
976
977 KASSERT(faddr->sa_family == AF_INET6,
978 ("not AF_INET6 faddr %d", faddr->sa_family));
979
980 sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
981 sin6->sin6_family = AF_INET6;
982 sin6->sin6_len = sizeof(*sin6);
983
984 sin6->sin6_port = ((const struct sockaddr_in6 *)faddr)->sin6_port;
985 sin6->sin6_addr = ((const struct sockaddr_in6 *)faddr)->sin6_addr;
986
987 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
988 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
989 else
990 sin6->sin6_scope_id = 0; /*XXX*/
991 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
992 sin6->sin6_addr.s6_addr16[1] = 0;
993
994 so->so_faddr = (struct sockaddr *)sin6;
995 }
996