1 /* $FreeBSD: releng/6.0/sys/netinet6/udp6_usrreq.c 146857 2005-06-01 11:38:19Z rwatson $ */
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_INFO_WLOCK(&udbinfo);
502 inp = sotoinpcb(so);
503 if (inp == 0) {
504 INP_INFO_WUNLOCK(&udbinfo);
505 return EINVAL; /* ??? possible? panic instead? */
506 }
507 soisdisconnected(so);
508 s = splnet();
509 INP_LOCK(inp);
510 in6_pcbdetach(inp);
511 INP_INFO_WUNLOCK(&udbinfo);
512 splx(s);
513 return 0;
514 }
515
516 static int
517 udp6_attach(struct socket *so, int proto, struct thread *td)
518 {
519 struct inpcb *inp;
520 int s, error;
521
522 INP_INFO_WLOCK(&udbinfo);
523 inp = sotoinpcb(so);
524 if (inp != 0) {
525 INP_INFO_WUNLOCK(&udbinfo);
526 return EINVAL;
527 }
528
529 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
530 error = soreserve(so, udp_sendspace, udp_recvspace);
531 if (error) {
532 INP_INFO_WUNLOCK(&udbinfo);
533 return error;
534 }
535 }
536 s = splnet();
537 error = in_pcballoc(so, &udbinfo, "udp6inp");
538 splx(s);
539 if (error) {
540 INP_INFO_WUNLOCK(&udbinfo);
541 return error;
542 }
543 inp = (struct inpcb *)so->so_pcb;
544 INP_LOCK(inp);
545 INP_INFO_WUNLOCK(&udbinfo);
546 inp->inp_vflag |= INP_IPV6;
547 if (!ip6_v6only)
548 inp->inp_vflag |= INP_IPV4;
549 inp->in6p_hops = -1; /* use kernel default */
550 inp->in6p_cksum = -1; /* just to be sure */
551 /*
552 * XXX: ugly!!
553 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
554 * because the socket may be bound to an IPv6 wildcard address,
555 * which may match an IPv4-mapped IPv6 address.
556 */
557 inp->inp_ip_ttl = ip_defttl;
558 INP_UNLOCK(inp);
559 return 0;
560 }
561
562 static int
563 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
564 {
565 struct inpcb *inp;
566 int s, error;
567
568 INP_INFO_WLOCK(&udbinfo);
569 inp = sotoinpcb(so);
570 if (inp == 0) {
571 INP_INFO_WUNLOCK(&udbinfo);
572 return EINVAL;
573 }
574 INP_LOCK(inp);
575
576 inp->inp_vflag &= ~INP_IPV4;
577 inp->inp_vflag |= INP_IPV6;
578 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
579 struct sockaddr_in6 *sin6_p;
580
581 sin6_p = (struct sockaddr_in6 *)nam;
582
583 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
584 inp->inp_vflag |= INP_IPV4;
585 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
586 struct sockaddr_in sin;
587
588 in6_sin6_2_sin(&sin, sin6_p);
589 inp->inp_vflag |= INP_IPV4;
590 inp->inp_vflag &= ~INP_IPV6;
591 s = splnet();
592 error = in_pcbbind(inp, (struct sockaddr *)&sin,
593 td->td_ucred);
594 goto out;
595 }
596 }
597
598 s = splnet();
599 error = in6_pcbbind(inp, nam, td->td_ucred);
600 out:
601 INP_UNLOCK(inp);
602 INP_INFO_WUNLOCK(&udbinfo);
603 splx(s);
604 return error;
605 }
606
607 static int
608 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
609 {
610 struct inpcb *inp;
611 int s, error;
612
613 INP_INFO_WLOCK(&udbinfo);
614 inp = sotoinpcb(so);
615 if (inp == 0) {
616 INP_INFO_WUNLOCK(&udbinfo);
617 return EINVAL;
618 }
619 INP_LOCK(inp);
620
621 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
622 struct sockaddr_in6 *sin6_p;
623
624 sin6_p = (struct sockaddr_in6 *)nam;
625 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
626 struct sockaddr_in sin;
627
628 if (inp->inp_faddr.s_addr != INADDR_ANY)
629 return EISCONN;
630 in6_sin6_2_sin(&sin, sin6_p);
631 s = splnet();
632 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
633 td->td_ucred);
634 splx(s);
635 if (error == 0) {
636 inp->inp_vflag |= INP_IPV4;
637 inp->inp_vflag &= ~INP_IPV6;
638 soisconnected(so);
639 }
640 goto out;
641 }
642 }
643 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
644 error = EISCONN;
645 goto out;
646 }
647 s = splnet();
648 error = in6_pcbconnect(inp, nam, td->td_ucred);
649 splx(s);
650 if (error == 0) {
651 if (!ip6_v6only) { /* should be non mapped addr */
652 inp->inp_vflag &= ~INP_IPV4;
653 inp->inp_vflag |= INP_IPV6;
654 }
655 soisconnected(so);
656 }
657 out:
658 INP_UNLOCK(inp);
659 INP_INFO_WUNLOCK(&udbinfo);
660 return error;
661 }
662
663 static int
664 udp6_detach(struct socket *so)
665 {
666 struct inpcb *inp;
667 int s;
668
669 INP_INFO_WLOCK(&udbinfo);
670 inp = sotoinpcb(so);
671 if (inp == 0) {
672 INP_INFO_WUNLOCK(&udbinfo);
673 return EINVAL;
674 }
675 INP_LOCK(inp);
676 s = splnet();
677 in6_pcbdetach(inp);
678 splx(s);
679 INP_INFO_WUNLOCK(&udbinfo);
680 return 0;
681 }
682
683 static int
684 udp6_disconnect(struct socket *so)
685 {
686 struct inpcb *inp;
687 int error, s;
688
689 INP_INFO_WLOCK(&udbinfo);
690 inp = sotoinpcb(so);
691 if (inp == 0) {
692 INP_INFO_WUNLOCK(&udbinfo);
693 return EINVAL;
694 }
695 INP_LOCK(inp);
696
697 #ifdef INET
698 if (inp->inp_vflag & INP_IPV4) {
699 struct pr_usrreqs *pru;
700
701 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
702 error = (*pru->pru_disconnect)(so);
703 goto out;
704 }
705 #endif
706
707 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
708 error = ENOTCONN;
709 goto out;
710 }
711
712 s = splnet();
713 in6_pcbdisconnect(inp);
714 inp->in6p_laddr = in6addr_any;
715 splx(s);
716 /* XXXRW: so_state locking? */
717 so->so_state &= ~SS_ISCONNECTED; /* XXX */
718 out:
719 INP_UNLOCK(inp);
720 INP_INFO_WUNLOCK(&udbinfo);
721 return 0;
722 }
723
724 static int
725 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
726 struct mbuf *control, struct thread *td)
727 {
728 struct inpcb *inp;
729 int error = 0;
730
731 INP_INFO_WLOCK(&udbinfo);
732 inp = sotoinpcb(so);
733 if (inp == 0) {
734 INP_INFO_WUNLOCK(&udbinfo);
735 m_freem(m);
736 return EINVAL;
737 }
738 INP_LOCK(inp);
739
740 if (addr) {
741 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
742 error = EINVAL;
743 goto bad;
744 }
745 if (addr->sa_family != AF_INET6) {
746 error = EAFNOSUPPORT;
747 goto bad;
748 }
749 }
750
751 #ifdef INET
752 if (!ip6_v6only) {
753 int hasv4addr;
754 struct sockaddr_in6 *sin6 = 0;
755
756 if (addr == 0)
757 hasv4addr = (inp->inp_vflag & INP_IPV4);
758 else {
759 sin6 = (struct sockaddr_in6 *)addr;
760 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
761 ? 1 : 0;
762 }
763 if (hasv4addr) {
764 struct pr_usrreqs *pru;
765
766 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
767 /*
768 * since a user of this socket set the
769 * IPV6_V6ONLY flag, we discard this
770 * datagram destined to a v4 addr.
771 */
772 error = EINVAL;
773 goto out;
774 }
775 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
776 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
777 /*
778 * when remote addr is IPv4-mapped
779 * address, local addr should not be
780 * an IPv6 address; since you cannot
781 * determine how to map IPv6 source
782 * address to IPv4.
783 */
784 error = EINVAL;
785 goto out;
786 }
787 if (sin6)
788 in6_sin6_2_sin_in_sock(addr);
789 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
790 error = ((*pru->pru_send)(so, flags, m, addr, control,
791 td));
792 /* addr will just be freed in sendit(). */
793 goto out;
794 }
795 }
796 #endif
797
798 error = udp6_output(inp, m, addr, control, td);
799 out:
800 INP_UNLOCK(inp);
801 INP_INFO_WUNLOCK(&udbinfo);
802 return error;
803
804 bad:
805 INP_UNLOCK(inp);
806 INP_INFO_WUNLOCK(&udbinfo);
807 m_freem(m);
808 return (error);
809 }
810
811 struct pr_usrreqs udp6_usrreqs = {
812 .pru_abort = udp6_abort,
813 .pru_attach = udp6_attach,
814 .pru_bind = udp6_bind,
815 .pru_connect = udp6_connect,
816 .pru_control = in6_control,
817 .pru_detach = udp6_detach,
818 .pru_disconnect = udp6_disconnect,
819 .pru_peeraddr = in6_mapped_peeraddr,
820 .pru_send = udp6_send,
821 .pru_shutdown = udp_shutdown,
822 .pru_sockaddr = in6_mapped_sockaddr,
823 .pru_sosetlabel = in_pcbsosetlabel
824 };
Cache object: 247eb2483551f83566f5c4428776c2c4
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