1 /* $FreeBSD: releng/5.3/sys/netinet6/udp6_usrreq.c 136588 2004-10-16 08:43:07Z cvs2svn $ */
2 /* $KAME: udp6_usrreq.c,v 1.27 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 * Copyright (c) 1982, 1986, 1989, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 4. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
62 */
63
64 #include "opt_inet.h"
65 #include "opt_inet6.h"
66 #include "opt_ipsec.h"
67
68 #include <sys/param.h>
69 #include <sys/errno.h>
70 #include <sys/kernel.h>
71 #include <sys/lock.h>
72 #include <sys/mbuf.h>
73 #include <sys/proc.h>
74 #include <sys/protosw.h>
75 #include <sys/signalvar.h>
76 #include <sys/socket.h>
77 #include <sys/socketvar.h>
78 #include <sys/stat.h>
79 #include <sys/sx.h>
80 #include <sys/sysctl.h>
81 #include <sys/syslog.h>
82 #include <sys/systm.h>
83
84 #include <net/if.h>
85 #include <net/if_types.h>
86 #include <net/route.h>
87
88 #include <netinet/in.h>
89 #include <netinet/in_pcb.h>
90 #include <netinet/in_systm.h>
91 #include <netinet/in_var.h>
92 #include <netinet/ip.h>
93 #include <netinet/ip6.h>
94 #include <netinet/icmp6.h>
95 #include <netinet/ip_var.h>
96 #include <netinet/udp.h>
97 #include <netinet/udp_var.h>
98 #include <netinet6/ip6protosw.h>
99 #include <netinet6/ip6_var.h>
100 #include <netinet6/in6_pcb.h>
101 #include <netinet6/udp6_var.h>
102
103 #ifdef IPSEC
104 #include <netinet6/ipsec.h>
105 #include <netinet6/ipsec6.h>
106 #endif /* IPSEC */
107
108 #ifdef FAST_IPSEC
109 #include <netipsec/ipsec.h>
110 #include <netipsec/ipsec6.h>
111 #endif /* FAST_IPSEC */
112
113 /*
114 * UDP protocol inplementation.
115 * Per RFC 768, August, 1980.
116 */
117
118 extern struct protosw inetsw[];
119 static int udp6_detach __P((struct socket *so));
120
121 int
122 udp6_input(mp, offp, proto)
123 struct mbuf **mp;
124 int *offp, proto;
125 {
126 struct mbuf *m = *mp, *opts;
127 register struct ip6_hdr *ip6;
128 register struct udphdr *uh;
129 register struct inpcb *in6p;
130 int off = *offp;
131 int plen, ulen;
132 struct sockaddr_in6 fromsa;
133
134 opts = NULL;
135
136 ip6 = mtod(m, struct ip6_hdr *);
137
138 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
139 /* XXX send icmp6 host/port unreach? */
140 m_freem(m);
141 return IPPROTO_DONE;
142 }
143
144 #ifndef PULLDOWN_TEST
145 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
146 ip6 = mtod(m, struct ip6_hdr *);
147 uh = (struct udphdr *)((caddr_t)ip6 + off);
148 #else
149 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
150 if (!uh)
151 return IPPROTO_DONE;
152 #endif
153
154 udpstat.udps_ipackets++;
155
156 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
157 ulen = ntohs((u_short)uh->uh_ulen);
158
159 if (plen != ulen) {
160 udpstat.udps_badlen++;
161 goto bad;
162 }
163
164 /*
165 * Checksum extended UDP header and data.
166 */
167 if (uh->uh_sum == 0) {
168 udpstat.udps_nosum++;
169 goto bad;
170 }
171 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
172 udpstat.udps_badsum++;
173 goto bad;
174 }
175
176 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
177 struct inpcb *last;
178
179 /*
180 * Deliver a multicast datagram to all sockets
181 * for which the local and remote addresses and ports match
182 * those of the incoming datagram. This allows more than
183 * one process to receive multicasts on the same port.
184 * (This really ought to be done for unicast datagrams as
185 * well, but that would cause problems with existing
186 * applications that open both address-specific sockets and
187 * a wildcard socket listening to the same port -- they would
188 * end up receiving duplicates of every unicast datagram.
189 * Those applications open the multiple sockets to overcome an
190 * inadequacy of the UDP socket interface, but for backwards
191 * compatibility we avoid the problem here rather than
192 * fixing the interface. Maybe 4.5BSD will remedy this?)
193 */
194
195 /*
196 * In a case that laddr should be set to the link-local
197 * address (this happens in RIPng), the multicast address
198 * specified in the received packet does not match with
199 * laddr. To cure this situation, the matching is relaxed
200 * if the receiving interface is the same as one specified
201 * in the socket and if the destination multicast address
202 * matches one of the multicast groups specified in the socket.
203 */
204
205 /*
206 * Construct sockaddr format source address.
207 */
208 init_sin6(&fromsa, m);
209 fromsa.sin6_port = uh->uh_sport;
210 /*
211 * KAME note: traditionally we dropped udpiphdr from mbuf here.
212 * We need udphdr for IPsec processing so we do that later.
213 */
214
215 /*
216 * Locate pcb(s) for datagram.
217 * (Algorithm copied from raw_intr().)
218 */
219 last = NULL;
220 LIST_FOREACH(in6p, &udb, inp_list) {
221 if ((in6p->inp_vflag & INP_IPV6) == 0)
222 continue;
223 if (in6p->in6p_lport != uh->uh_dport)
224 continue;
225 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
226 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
227 &ip6->ip6_dst))
228 continue;
229 }
230 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
231 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
232 &ip6->ip6_src) ||
233 in6p->in6p_fport != uh->uh_sport)
234 continue;
235 }
236
237 if (last != NULL) {
238 struct mbuf *n;
239
240 #if defined(IPSEC) || defined(FAST_IPSEC)
241 /*
242 * Check AH/ESP integrity.
243 */
244 if (ipsec6_in_reject(m, last)) {
245 #ifdef IPSEC
246 ipsec6stat.in_polvio++;
247 #endif /* IPSEC */
248 /* do not inject data into pcb */
249 } else
250 #endif /*IPSEC || FAST_IPSEC*/
251 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
252 /*
253 * KAME NOTE: do not
254 * m_copy(m, offset, ...) above.
255 * sbappendaddr() expects M_PKTHDR,
256 * and m_copy() will copy M_PKTHDR
257 * only if offset is 0.
258 */
259 if (last->in6p_flags & IN6P_CONTROLOPTS
260 || last->in6p_socket->so_options & SO_TIMESTAMP)
261 ip6_savecontrol(last, n, &opts);
262
263 m_adj(n, off + sizeof(struct udphdr));
264 if (sbappendaddr(&last->in6p_socket->so_rcv,
265 (struct sockaddr *)&fromsa,
266 n, opts) == 0) {
267 m_freem(n);
268 if (opts)
269 m_freem(opts);
270 udpstat.udps_fullsock++;
271 } else
272 sorwakeup(last->in6p_socket);
273 opts = NULL;
274 }
275 }
276 last = in6p;
277 /*
278 * Don't look for additional matches if this one does
279 * not have either the SO_REUSEPORT or SO_REUSEADDR
280 * socket options set. This heuristic avoids searching
281 * through all pcbs in the common case of a non-shared
282 * port. It assumes that an application will never
283 * clear these options after setting them.
284 */
285 if ((last->in6p_socket->so_options &
286 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
287 break;
288 }
289
290 if (last == NULL) {
291 /*
292 * No matching pcb found; discard datagram.
293 * (No need to send an ICMP Port Unreachable
294 * for a broadcast or multicast datgram.)
295 */
296 udpstat.udps_noport++;
297 udpstat.udps_noportmcast++;
298 goto bad;
299 }
300 #if defined(IPSEC) || defined(FAST_IPSEC)
301 /*
302 * Check AH/ESP integrity.
303 */
304 if (ipsec6_in_reject(m, last)) {
305 #ifdef IPSEC
306 ipsec6stat.in_polvio++;
307 #endif /* IPSEC */
308 goto bad;
309 }
310 #endif /*IPSEC || FAST_IPSEC*/
311 if (last->in6p_flags & IN6P_CONTROLOPTS
312 || last->in6p_socket->so_options & SO_TIMESTAMP)
313 ip6_savecontrol(last, m, &opts);
314
315 m_adj(m, off + sizeof(struct udphdr));
316 if (sbappendaddr(&last->in6p_socket->so_rcv,
317 (struct sockaddr *)&fromsa,
318 m, opts) == 0) {
319 udpstat.udps_fullsock++;
320 goto bad;
321 }
322 sorwakeup(last->in6p_socket);
323 return IPPROTO_DONE;
324 }
325 /*
326 * Locate pcb for datagram.
327 */
328 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
329 &ip6->ip6_dst, uh->uh_dport, 1,
330 m->m_pkthdr.rcvif);
331 if (in6p == 0) {
332 if (log_in_vain) {
333 char buf[INET6_ADDRSTRLEN];
334
335 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
336 log(LOG_INFO,
337 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
338 buf, ntohs(uh->uh_dport),
339 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
340 }
341 udpstat.udps_noport++;
342 if (m->m_flags & M_MCAST) {
343 printf("UDP6: M_MCAST is set in a unicast packet.\n");
344 udpstat.udps_noportmcast++;
345 goto bad;
346 }
347 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
348 return IPPROTO_DONE;
349 }
350 #if defined(IPSEC) || defined(FAST_IPSEC)
351 /*
352 * Check AH/ESP integrity.
353 */
354 if (ipsec6_in_reject(m, in6p)) {
355 #ifdef IPSEC
356 ipsec6stat.in_polvio++;
357 #endif /* IPSEC */
358 goto bad;
359 }
360 #endif /*IPSEC || FAST_IPSEC*/
361
362 /*
363 * Construct sockaddr format source address.
364 * Stuff source address and datagram in user buffer.
365 */
366 init_sin6(&fromsa, m);
367 fromsa.sin6_port = uh->uh_sport;
368 if (in6p->in6p_flags & IN6P_CONTROLOPTS
369 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
370 ip6_savecontrol(in6p, m, &opts);
371 m_adj(m, off + sizeof(struct udphdr));
372 if (sbappendaddr(&in6p->in6p_socket->so_rcv,
373 (struct sockaddr *)&fromsa, m, opts) == 0) {
374 udpstat.udps_fullsock++;
375 goto bad;
376 }
377 sorwakeup(in6p->in6p_socket);
378 return IPPROTO_DONE;
379 bad:
380 if (m)
381 m_freem(m);
382 if (opts)
383 m_freem(opts);
384 return IPPROTO_DONE;
385 }
386
387 void
388 udp6_ctlinput(cmd, sa, d)
389 int cmd;
390 struct sockaddr *sa;
391 void *d;
392 {
393 struct udphdr uh;
394 struct ip6_hdr *ip6;
395 struct mbuf *m;
396 int off = 0;
397 struct ip6ctlparam *ip6cp = NULL;
398 const struct sockaddr_in6 *sa6_src = NULL;
399 void *cmdarg;
400 struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify;
401 struct udp_portonly {
402 u_int16_t uh_sport;
403 u_int16_t uh_dport;
404 } *uhp;
405
406 if (sa->sa_family != AF_INET6 ||
407 sa->sa_len != sizeof(struct sockaddr_in6))
408 return;
409
410 if ((unsigned)cmd >= PRC_NCMDS)
411 return;
412 if (PRC_IS_REDIRECT(cmd))
413 notify = in6_rtchange, d = NULL;
414 else if (cmd == PRC_HOSTDEAD)
415 d = NULL;
416 else if (inet6ctlerrmap[cmd] == 0)
417 return;
418
419 /* if the parameter is from icmp6, decode it. */
420 if (d != NULL) {
421 ip6cp = (struct ip6ctlparam *)d;
422 m = ip6cp->ip6c_m;
423 ip6 = ip6cp->ip6c_ip6;
424 off = ip6cp->ip6c_off;
425 cmdarg = ip6cp->ip6c_cmdarg;
426 sa6_src = ip6cp->ip6c_src;
427 } else {
428 m = NULL;
429 ip6 = NULL;
430 cmdarg = NULL;
431 sa6_src = &sa6_any;
432 }
433
434 if (ip6) {
435 /*
436 * XXX: We assume that when IPV6 is non NULL,
437 * M and OFF are valid.
438 */
439
440 /* check if we can safely examine src and dst ports */
441 if (m->m_pkthdr.len < off + sizeof(*uhp))
442 return;
443
444 bzero(&uh, sizeof(uh));
445 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
446
447 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
448 (struct sockaddr *)ip6cp->ip6c_src,
449 uh.uh_sport, cmd, cmdarg, notify);
450 } else
451 (void) in6_pcbnotify(&udbinfo, sa, 0,
452 (const struct sockaddr *)sa6_src,
453 0, cmd, cmdarg, notify);
454 }
455
456 static int
457 udp6_getcred(SYSCTL_HANDLER_ARGS)
458 {
459 struct xucred xuc;
460 struct sockaddr_in6 addrs[2];
461 struct inpcb *inp;
462 int error, s;
463
464 error = suser(req->td);
465 if (error)
466 return (error);
467
468 if (req->newlen != sizeof(addrs))
469 return (EINVAL);
470 if (req->oldlen != sizeof(struct xucred))
471 return (EINVAL);
472 error = SYSCTL_IN(req, addrs, sizeof(addrs));
473 if (error)
474 return (error);
475 s = splnet();
476 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
477 addrs[1].sin6_port,
478 &addrs[0].sin6_addr, addrs[0].sin6_port,
479 1, NULL);
480 if (!inp || !inp->inp_socket) {
481 error = ENOENT;
482 goto out;
483 }
484 cru2x(inp->inp_socket->so_cred, &xuc);
485 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
486 out:
487 splx(s);
488 return (error);
489 }
490
491 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
492 0, 0,
493 udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
494
495 static int
496 udp6_abort(struct socket *so)
497 {
498 struct inpcb *inp;
499 int s;
500
501 inp = sotoinpcb(so);
502 if (inp == 0)
503 return EINVAL; /* ??? possible? panic instead? */
504 soisdisconnected(so);
505 s = splnet();
506 in6_pcbdetach(inp);
507 splx(s);
508 return 0;
509 }
510
511 static int
512 udp6_attach(struct socket *so, int proto, struct thread *td)
513 {
514 struct inpcb *inp;
515 int s, error;
516
517 INP_INFO_WLOCK(&udbinfo);
518 inp = sotoinpcb(so);
519 if (inp != 0) {
520 INP_INFO_WUNLOCK(&udbinfo);
521 return EINVAL;
522 }
523
524 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
525 error = soreserve(so, udp_sendspace, udp_recvspace);
526 if (error) {
527 INP_INFO_WUNLOCK(&udbinfo);
528 return error;
529 }
530 }
531 s = splnet();
532 error = in_pcballoc(so, &udbinfo, "udp6inp");
533 splx(s);
534 if (error) {
535 INP_INFO_WUNLOCK(&udbinfo);
536 return error;
537 }
538 inp = (struct inpcb *)so->so_pcb;
539 INP_LOCK(inp);
540 INP_INFO_WUNLOCK(&udbinfo);
541 inp->inp_vflag |= INP_IPV6;
542 if (!ip6_v6only)
543 inp->inp_vflag |= INP_IPV4;
544 inp->in6p_hops = -1; /* use kernel default */
545 inp->in6p_cksum = -1; /* just to be sure */
546 /*
547 * XXX: ugly!!
548 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
549 * because the socket may be bound to an IPv6 wildcard address,
550 * which may match an IPv4-mapped IPv6 address.
551 */
552 inp->inp_ip_ttl = ip_defttl;
553 INP_UNLOCK(inp);
554 return 0;
555 }
556
557 static int
558 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
559 {
560 struct inpcb *inp;
561 int s, error;
562
563 INP_INFO_WLOCK(&udbinfo);
564 inp = sotoinpcb(so);
565 if (inp == 0) {
566 INP_INFO_WUNLOCK(&udbinfo);
567 return EINVAL;
568 }
569 INP_LOCK(inp);
570
571 inp->inp_vflag &= ~INP_IPV4;
572 inp->inp_vflag |= INP_IPV6;
573 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
574 struct sockaddr_in6 *sin6_p;
575
576 sin6_p = (struct sockaddr_in6 *)nam;
577
578 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
579 inp->inp_vflag |= INP_IPV4;
580 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
581 struct sockaddr_in sin;
582
583 in6_sin6_2_sin(&sin, sin6_p);
584 inp->inp_vflag |= INP_IPV4;
585 inp->inp_vflag &= ~INP_IPV6;
586 s = splnet();
587 error = in_pcbbind(inp, (struct sockaddr *)&sin,
588 td->td_ucred);
589 goto out;
590 }
591 }
592
593 s = splnet();
594 error = in6_pcbbind(inp, nam, td->td_ucred);
595 out:
596 INP_UNLOCK(inp);
597 INP_INFO_WUNLOCK(&udbinfo);
598 splx(s);
599 return error;
600 }
601
602 static int
603 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
604 {
605 struct inpcb *inp;
606 int s, error;
607
608 INP_INFO_WLOCK(&udbinfo);
609 inp = sotoinpcb(so);
610 if (inp == 0) {
611 INP_INFO_WUNLOCK(&udbinfo);
612 return EINVAL;
613 }
614 INP_LOCK(inp);
615
616 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
617 struct sockaddr_in6 *sin6_p;
618
619 sin6_p = (struct sockaddr_in6 *)nam;
620 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
621 struct sockaddr_in sin;
622
623 if (inp->inp_faddr.s_addr != INADDR_ANY)
624 return EISCONN;
625 in6_sin6_2_sin(&sin, sin6_p);
626 s = splnet();
627 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
628 td->td_ucred);
629 splx(s);
630 if (error == 0) {
631 inp->inp_vflag |= INP_IPV4;
632 inp->inp_vflag &= ~INP_IPV6;
633 soisconnected(so);
634 }
635 goto out;
636 }
637 }
638 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
639 error = EISCONN;
640 goto out;
641 }
642 s = splnet();
643 error = in6_pcbconnect(inp, nam, td->td_ucred);
644 splx(s);
645 if (error == 0) {
646 if (!ip6_v6only) { /* should be non mapped addr */
647 inp->inp_vflag &= ~INP_IPV4;
648 inp->inp_vflag |= INP_IPV6;
649 }
650 soisconnected(so);
651 }
652 out:
653 INP_UNLOCK(inp);
654 INP_INFO_WUNLOCK(&udbinfo);
655 return error;
656 }
657
658 static int
659 udp6_detach(struct socket *so)
660 {
661 struct inpcb *inp;
662 int s;
663
664 INP_INFO_WLOCK(&udbinfo);
665 inp = sotoinpcb(so);
666 if (inp == 0) {
667 INP_INFO_WUNLOCK(&udbinfo);
668 return EINVAL;
669 }
670 INP_LOCK(inp);
671 s = splnet();
672 in6_pcbdetach(inp);
673 splx(s);
674 INP_INFO_WUNLOCK(&udbinfo);
675 return 0;
676 }
677
678 static int
679 udp6_disconnect(struct socket *so)
680 {
681 struct inpcb *inp;
682 int error, s;
683
684 INP_INFO_WLOCK(&udbinfo);
685 inp = sotoinpcb(so);
686 if (inp == 0) {
687 INP_INFO_WUNLOCK(&udbinfo);
688 return EINVAL;
689 }
690 INP_LOCK(inp);
691
692 #ifdef INET
693 if (inp->inp_vflag & INP_IPV4) {
694 struct pr_usrreqs *pru;
695
696 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
697 error = (*pru->pru_disconnect)(so);
698 goto out;
699 }
700 #endif
701
702 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
703 error = ENOTCONN;
704 goto out;
705 }
706
707 s = splnet();
708 in6_pcbdisconnect(inp);
709 inp->in6p_laddr = in6addr_any;
710 splx(s);
711 /* XXXRW: so_state locking? */
712 so->so_state &= ~SS_ISCONNECTED; /* XXX */
713 out:
714 INP_UNLOCK(inp);
715 INP_INFO_WUNLOCK(&udbinfo);
716 return 0;
717 }
718
719 static int
720 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
721 struct mbuf *control, struct thread *td)
722 {
723 struct inpcb *inp;
724 int error = 0;
725
726 INP_INFO_WLOCK(&udbinfo);
727 inp = sotoinpcb(so);
728 if (inp == 0) {
729 INP_INFO_WUNLOCK(&udbinfo);
730 m_freem(m);
731 return EINVAL;
732 }
733 INP_LOCK(inp);
734
735 if (addr) {
736 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
737 error = EINVAL;
738 goto bad;
739 }
740 if (addr->sa_family != AF_INET6) {
741 error = EAFNOSUPPORT;
742 goto bad;
743 }
744 }
745
746 #ifdef INET
747 if (!ip6_v6only) {
748 int hasv4addr;
749 struct sockaddr_in6 *sin6 = 0;
750
751 if (addr == 0)
752 hasv4addr = (inp->inp_vflag & INP_IPV4);
753 else {
754 sin6 = (struct sockaddr_in6 *)addr;
755 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
756 ? 1 : 0;
757 }
758 if (hasv4addr) {
759 struct pr_usrreqs *pru;
760
761 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
762 /*
763 * since a user of this socket set the
764 * IPV6_V6ONLY flag, we discard this
765 * datagram destined to a v4 addr.
766 */
767 error = EINVAL;
768 goto out;
769 }
770 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
771 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
772 /*
773 * when remote addr is IPv4-mapped
774 * address, local addr should not be
775 * an IPv6 address; since you cannot
776 * determine how to map IPv6 source
777 * address to IPv4.
778 */
779 error = EINVAL;
780 goto out;
781 }
782 if (sin6)
783 in6_sin6_2_sin_in_sock(addr);
784 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
785 error = ((*pru->pru_send)(so, flags, m, addr, control,
786 td));
787 /* addr will just be freed in sendit(). */
788 goto out;
789 }
790 }
791 #endif
792
793 error = udp6_output(inp, m, addr, control, td);
794 out:
795 INP_UNLOCK(inp);
796 INP_INFO_WUNLOCK(&udbinfo);
797 return error;
798
799 bad:
800 INP_UNLOCK(inp);
801 INP_INFO_WUNLOCK(&udbinfo);
802 m_freem(m);
803 return (error);
804 }
805
806 struct pr_usrreqs udp6_usrreqs = {
807 udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
808 pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
809 pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
810 pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
811 in6_mapped_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel
812 };
Cache object: f13283a54a6aa504327296517e227dfd
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