1 /* $FreeBSD: releng/6.2/sys/netinet6/udp6_usrreq.c 155464 2006-02-09 02:33:14Z ume $ */
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 #include <netinet6/scope6_var.h>
103
104 #ifdef IPSEC
105 #include <netinet6/ipsec.h>
106 #include <netinet6/ipsec6.h>
107 #endif /* IPSEC */
108
109 #ifdef FAST_IPSEC
110 #include <netipsec/ipsec.h>
111 #include <netipsec/ipsec6.h>
112 #endif /* FAST_IPSEC */
113
114 /*
115 * UDP protocol inplementation.
116 * Per RFC 768, August, 1980.
117 */
118
119 extern struct protosw inetsw[];
120 static int udp6_detach __P((struct socket *so));
121
122 int
123 udp6_input(mp, offp, proto)
124 struct mbuf **mp;
125 int *offp, proto;
126 {
127 struct mbuf *m = *mp, *opts;
128 register struct ip6_hdr *ip6;
129 register struct udphdr *uh;
130 register struct inpcb *in6p;
131 int off = *offp;
132 int plen, ulen;
133 struct sockaddr_in6 fromsa;
134
135 opts = NULL;
136
137 ip6 = mtod(m, struct ip6_hdr *);
138
139 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
140 /* XXX send icmp6 host/port unreach? */
141 m_freem(m);
142 return IPPROTO_DONE;
143 }
144
145 #ifndef PULLDOWN_TEST
146 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
147 ip6 = mtod(m, struct ip6_hdr *);
148 uh = (struct udphdr *)((caddr_t)ip6 + off);
149 #else
150 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
151 if (!uh)
152 return IPPROTO_DONE;
153 #endif
154
155 udpstat.udps_ipackets++;
156
157 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
158 ulen = ntohs((u_short)uh->uh_ulen);
159
160 if (plen != ulen) {
161 udpstat.udps_badlen++;
162 goto bad;
163 }
164
165 /*
166 * Checksum extended UDP header and data.
167 */
168 if (uh->uh_sum == 0) {
169 udpstat.udps_nosum++;
170 goto bad;
171 }
172 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
173 udpstat.udps_badsum++;
174 goto bad;
175 }
176
177 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
178 struct inpcb *last;
179
180 /*
181 * Deliver a multicast datagram to all sockets
182 * for which the local and remote addresses and ports match
183 * those of the incoming datagram. This allows more than
184 * one process to receive multicasts on the same port.
185 * (This really ought to be done for unicast datagrams as
186 * well, but that would cause problems with existing
187 * applications that open both address-specific sockets and
188 * a wildcard socket listening to the same port -- they would
189 * end up receiving duplicates of every unicast datagram.
190 * Those applications open the multiple sockets to overcome an
191 * inadequacy of the UDP socket interface, but for backwards
192 * compatibility we avoid the problem here rather than
193 * fixing the interface. Maybe 4.5BSD will remedy this?)
194 */
195
196 /*
197 * In a case that laddr should be set to the link-local
198 * address (this happens in RIPng), the multicast address
199 * specified in the received packet does not match with
200 * laddr. To cure this situation, the matching is relaxed
201 * if the receiving interface is the same as one specified
202 * in the socket and if the destination multicast address
203 * matches one of the multicast groups specified in the socket.
204 */
205
206 /*
207 * Construct sockaddr format source address.
208 */
209 init_sin6(&fromsa, m);
210 fromsa.sin6_port = uh->uh_sport;
211 /*
212 * KAME note: traditionally we dropped udpiphdr from mbuf here.
213 * We need udphdr for IPsec processing so we do that later.
214 */
215
216 /*
217 * Locate pcb(s) for datagram.
218 * (Algorithm copied from raw_intr().)
219 */
220 last = NULL;
221 LIST_FOREACH(in6p, &udb, inp_list) {
222 if ((in6p->inp_vflag & INP_IPV6) == 0)
223 continue;
224 if (in6p->in6p_lport != uh->uh_dport)
225 continue;
226 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
227 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
228 &ip6->ip6_dst))
229 continue;
230 }
231 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
232 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
233 &ip6->ip6_src) ||
234 in6p->in6p_fport != uh->uh_sport)
235 continue;
236 }
237
238 if (last != NULL) {
239 struct mbuf *n;
240
241 #if defined(IPSEC) || defined(FAST_IPSEC)
242 /*
243 * Check AH/ESP integrity.
244 */
245 if (ipsec6_in_reject(m, last)) {
246 #ifdef IPSEC
247 ipsec6stat.in_polvio++;
248 #endif /* IPSEC */
249 /* do not inject data into pcb */
250 } else
251 #endif /*IPSEC || FAST_IPSEC*/
252 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
253 /*
254 * KAME NOTE: do not
255 * m_copy(m, offset, ...) above.
256 * sbappendaddr() expects M_PKTHDR,
257 * and m_copy() will copy M_PKTHDR
258 * only if offset is 0.
259 */
260 if (last->in6p_flags & IN6P_CONTROLOPTS
261 || last->in6p_socket->so_options & SO_TIMESTAMP)
262 ip6_savecontrol(last, n, &opts);
263
264 m_adj(n, off + sizeof(struct udphdr));
265 if (sbappendaddr(&last->in6p_socket->so_rcv,
266 (struct sockaddr *)&fromsa,
267 n, opts) == 0) {
268 m_freem(n);
269 if (opts)
270 m_freem(opts);
271 udpstat.udps_fullsock++;
272 } else
273 sorwakeup(last->in6p_socket);
274 opts = NULL;
275 }
276 }
277 last = in6p;
278 /*
279 * Don't look for additional matches if this one does
280 * not have either the SO_REUSEPORT or SO_REUSEADDR
281 * socket options set. This heuristic avoids searching
282 * through all pcbs in the common case of a non-shared
283 * port. It assumes that an application will never
284 * clear these options after setting them.
285 */
286 if ((last->in6p_socket->so_options &
287 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
288 break;
289 }
290
291 if (last == NULL) {
292 /*
293 * No matching pcb found; discard datagram.
294 * (No need to send an ICMP Port Unreachable
295 * for a broadcast or multicast datgram.)
296 */
297 udpstat.udps_noport++;
298 udpstat.udps_noportmcast++;
299 goto bad;
300 }
301 #if defined(IPSEC) || defined(FAST_IPSEC)
302 /*
303 * Check AH/ESP integrity.
304 */
305 if (ipsec6_in_reject(m, last)) {
306 #ifdef IPSEC
307 ipsec6stat.in_polvio++;
308 #endif /* IPSEC */
309 goto bad;
310 }
311 #endif /*IPSEC || FAST_IPSEC*/
312 if (last->in6p_flags & IN6P_CONTROLOPTS
313 || last->in6p_socket->so_options & SO_TIMESTAMP)
314 ip6_savecontrol(last, m, &opts);
315
316 m_adj(m, off + sizeof(struct udphdr));
317 if (sbappendaddr(&last->in6p_socket->so_rcv,
318 (struct sockaddr *)&fromsa,
319 m, opts) == 0) {
320 udpstat.udps_fullsock++;
321 goto bad;
322 }
323 sorwakeup(last->in6p_socket);
324 return IPPROTO_DONE;
325 }
326 /*
327 * Locate pcb for datagram.
328 */
329 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
330 &ip6->ip6_dst, uh->uh_dport, 1,
331 m->m_pkthdr.rcvif);
332 if (in6p == 0) {
333 if (log_in_vain) {
334 char buf[INET6_ADDRSTRLEN];
335
336 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
337 log(LOG_INFO,
338 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
339 buf, ntohs(uh->uh_dport),
340 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
341 }
342 udpstat.udps_noport++;
343 if (m->m_flags & M_MCAST) {
344 printf("UDP6: M_MCAST is set in a unicast packet.\n");
345 udpstat.udps_noportmcast++;
346 goto bad;
347 }
348 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
349 return IPPROTO_DONE;
350 }
351 #if defined(IPSEC) || defined(FAST_IPSEC)
352 /*
353 * Check AH/ESP integrity.
354 */
355 if (ipsec6_in_reject(m, in6p)) {
356 #ifdef IPSEC
357 ipsec6stat.in_polvio++;
358 #endif /* IPSEC */
359 goto bad;
360 }
361 #endif /*IPSEC || FAST_IPSEC*/
362
363 /*
364 * Construct sockaddr format source address.
365 * Stuff source address and datagram in user buffer.
366 */
367 init_sin6(&fromsa, m);
368 fromsa.sin6_port = uh->uh_sport;
369 if (in6p->in6p_flags & IN6P_CONTROLOPTS
370 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
371 ip6_savecontrol(in6p, m, &opts);
372 m_adj(m, off + sizeof(struct udphdr));
373 if (sbappendaddr(&in6p->in6p_socket->so_rcv,
374 (struct sockaddr *)&fromsa, m, opts) == 0) {
375 udpstat.udps_fullsock++;
376 goto bad;
377 }
378 sorwakeup(in6p->in6p_socket);
379 return IPPROTO_DONE;
380 bad:
381 if (m)
382 m_freem(m);
383 if (opts)
384 m_freem(opts);
385 return IPPROTO_DONE;
386 }
387
388 void
389 udp6_ctlinput(cmd, sa, d)
390 int cmd;
391 struct sockaddr *sa;
392 void *d;
393 {
394 struct udphdr uh;
395 struct ip6_hdr *ip6;
396 struct mbuf *m;
397 int off = 0;
398 struct ip6ctlparam *ip6cp = NULL;
399 const struct sockaddr_in6 *sa6_src = NULL;
400 void *cmdarg;
401 struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify;
402 struct udp_portonly {
403 u_int16_t uh_sport;
404 u_int16_t uh_dport;
405 } *uhp;
406
407 if (sa->sa_family != AF_INET6 ||
408 sa->sa_len != sizeof(struct sockaddr_in6))
409 return;
410
411 if ((unsigned)cmd >= PRC_NCMDS)
412 return;
413 if (PRC_IS_REDIRECT(cmd))
414 notify = in6_rtchange, d = NULL;
415 else if (cmd == PRC_HOSTDEAD)
416 d = NULL;
417 else if (inet6ctlerrmap[cmd] == 0)
418 return;
419
420 /* if the parameter is from icmp6, decode it. */
421 if (d != NULL) {
422 ip6cp = (struct ip6ctlparam *)d;
423 m = ip6cp->ip6c_m;
424 ip6 = ip6cp->ip6c_ip6;
425 off = ip6cp->ip6c_off;
426 cmdarg = ip6cp->ip6c_cmdarg;
427 sa6_src = ip6cp->ip6c_src;
428 } else {
429 m = NULL;
430 ip6 = NULL;
431 cmdarg = NULL;
432 sa6_src = &sa6_any;
433 }
434
435 if (ip6) {
436 /*
437 * XXX: We assume that when IPV6 is non NULL,
438 * M and OFF are valid.
439 */
440
441 /* check if we can safely examine src and dst ports */
442 if (m->m_pkthdr.len < off + sizeof(*uhp))
443 return;
444
445 bzero(&uh, sizeof(uh));
446 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
447
448 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
449 (struct sockaddr *)ip6cp->ip6c_src,
450 uh.uh_sport, cmd, cmdarg, notify);
451 } else
452 (void) in6_pcbnotify(&udbinfo, sa, 0,
453 (const struct sockaddr *)sa6_src,
454 0, cmd, cmdarg, notify);
455 }
456
457 static int
458 udp6_getcred(SYSCTL_HANDLER_ARGS)
459 {
460 struct xucred xuc;
461 struct sockaddr_in6 addrs[2];
462 struct inpcb *inp;
463 int error, s;
464
465 error = suser(req->td);
466 if (error)
467 return (error);
468
469 if (req->newlen != sizeof(addrs))
470 return (EINVAL);
471 if (req->oldlen != sizeof(struct xucred))
472 return (EINVAL);
473 error = SYSCTL_IN(req, addrs, sizeof(addrs));
474 if (error)
475 return (error);
476 if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 ||
477 (error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) {
478 return (error);
479 }
480 s = splnet();
481 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
482 addrs[1].sin6_port,
483 &addrs[0].sin6_addr, addrs[0].sin6_port,
484 1, NULL);
485 if (!inp || !inp->inp_socket) {
486 error = ENOENT;
487 goto out;
488 }
489 cru2x(inp->inp_socket->so_cred, &xuc);
490 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
491 out:
492 splx(s);
493 return (error);
494 }
495
496 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
497 0, 0,
498 udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
499
500 static int
501 udp6_abort(struct socket *so)
502 {
503 struct inpcb *inp;
504 int s;
505
506 INP_INFO_WLOCK(&udbinfo);
507 inp = sotoinpcb(so);
508 if (inp == 0) {
509 INP_INFO_WUNLOCK(&udbinfo);
510 return EINVAL; /* ??? possible? panic instead? */
511 }
512 soisdisconnected(so);
513 s = splnet();
514 INP_LOCK(inp);
515 in6_pcbdetach(inp);
516 INP_INFO_WUNLOCK(&udbinfo);
517 splx(s);
518 return 0;
519 }
520
521 static int
522 udp6_attach(struct socket *so, int proto, struct thread *td)
523 {
524 struct inpcb *inp;
525 int s, error;
526
527 INP_INFO_WLOCK(&udbinfo);
528 inp = sotoinpcb(so);
529 if (inp != 0) {
530 INP_INFO_WUNLOCK(&udbinfo);
531 return EINVAL;
532 }
533
534 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
535 error = soreserve(so, udp_sendspace, udp_recvspace);
536 if (error) {
537 INP_INFO_WUNLOCK(&udbinfo);
538 return error;
539 }
540 }
541 s = splnet();
542 error = in_pcballoc(so, &udbinfo, "udp6inp");
543 splx(s);
544 if (error) {
545 INP_INFO_WUNLOCK(&udbinfo);
546 return error;
547 }
548 inp = (struct inpcb *)so->so_pcb;
549 INP_LOCK(inp);
550 INP_INFO_WUNLOCK(&udbinfo);
551 inp->inp_vflag |= INP_IPV6;
552 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
553 inp->inp_vflag |= INP_IPV4;
554 inp->in6p_hops = -1; /* use kernel default */
555 inp->in6p_cksum = -1; /* just to be sure */
556 /*
557 * XXX: ugly!!
558 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
559 * because the socket may be bound to an IPv6 wildcard address,
560 * which may match an IPv4-mapped IPv6 address.
561 */
562 inp->inp_ip_ttl = ip_defttl;
563 INP_UNLOCK(inp);
564 return 0;
565 }
566
567 static int
568 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
569 {
570 struct inpcb *inp;
571 int s, error;
572
573 INP_INFO_WLOCK(&udbinfo);
574 inp = sotoinpcb(so);
575 if (inp == 0) {
576 INP_INFO_WUNLOCK(&udbinfo);
577 return EINVAL;
578 }
579 INP_LOCK(inp);
580
581 inp->inp_vflag &= ~INP_IPV4;
582 inp->inp_vflag |= INP_IPV6;
583 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
584 struct sockaddr_in6 *sin6_p;
585
586 sin6_p = (struct sockaddr_in6 *)nam;
587
588 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
589 inp->inp_vflag |= INP_IPV4;
590 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
591 struct sockaddr_in sin;
592
593 in6_sin6_2_sin(&sin, sin6_p);
594 inp->inp_vflag |= INP_IPV4;
595 inp->inp_vflag &= ~INP_IPV6;
596 s = splnet();
597 error = in_pcbbind(inp, (struct sockaddr *)&sin,
598 td->td_ucred);
599 goto out;
600 }
601 }
602
603 s = splnet();
604 error = in6_pcbbind(inp, nam, td->td_ucred);
605 out:
606 INP_UNLOCK(inp);
607 INP_INFO_WUNLOCK(&udbinfo);
608 splx(s);
609 return error;
610 }
611
612 static int
613 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
614 {
615 struct inpcb *inp;
616 int s, error;
617
618 INP_INFO_WLOCK(&udbinfo);
619 inp = sotoinpcb(so);
620 if (inp == 0) {
621 INP_INFO_WUNLOCK(&udbinfo);
622 return EINVAL;
623 }
624 INP_LOCK(inp);
625
626 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
627 struct sockaddr_in6 *sin6_p;
628
629 sin6_p = (struct sockaddr_in6 *)nam;
630 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
631 struct sockaddr_in sin;
632
633 if (inp->inp_faddr.s_addr != INADDR_ANY)
634 return EISCONN;
635 in6_sin6_2_sin(&sin, sin6_p);
636 s = splnet();
637 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
638 td->td_ucred);
639 splx(s);
640 if (error == 0) {
641 inp->inp_vflag |= INP_IPV4;
642 inp->inp_vflag &= ~INP_IPV6;
643 soisconnected(so);
644 }
645 goto out;
646 }
647 }
648 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
649 error = EISCONN;
650 goto out;
651 }
652 s = splnet();
653 error = in6_pcbconnect(inp, nam, td->td_ucred);
654 splx(s);
655 if (error == 0) {
656 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
657 /* should be non mapped addr */
658 inp->inp_vflag &= ~INP_IPV4;
659 inp->inp_vflag |= INP_IPV6;
660 }
661 soisconnected(so);
662 }
663 out:
664 INP_UNLOCK(inp);
665 INP_INFO_WUNLOCK(&udbinfo);
666 return error;
667 }
668
669 static int
670 udp6_detach(struct socket *so)
671 {
672 struct inpcb *inp;
673 int s;
674
675 INP_INFO_WLOCK(&udbinfo);
676 inp = sotoinpcb(so);
677 if (inp == 0) {
678 INP_INFO_WUNLOCK(&udbinfo);
679 return EINVAL;
680 }
681 INP_LOCK(inp);
682 s = splnet();
683 in6_pcbdetach(inp);
684 splx(s);
685 INP_INFO_WUNLOCK(&udbinfo);
686 return 0;
687 }
688
689 static int
690 udp6_disconnect(struct socket *so)
691 {
692 struct inpcb *inp;
693 int error, s;
694
695 INP_INFO_WLOCK(&udbinfo);
696 inp = sotoinpcb(so);
697 if (inp == 0) {
698 INP_INFO_WUNLOCK(&udbinfo);
699 return EINVAL;
700 }
701 INP_LOCK(inp);
702
703 #ifdef INET
704 if (inp->inp_vflag & INP_IPV4) {
705 struct pr_usrreqs *pru;
706
707 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
708 error = (*pru->pru_disconnect)(so);
709 goto out;
710 }
711 #endif
712
713 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
714 error = ENOTCONN;
715 goto out;
716 }
717
718 s = splnet();
719 in6_pcbdisconnect(inp);
720 inp->in6p_laddr = in6addr_any;
721 splx(s);
722 /* XXXRW: so_state locking? */
723 so->so_state &= ~SS_ISCONNECTED; /* XXX */
724 out:
725 INP_UNLOCK(inp);
726 INP_INFO_WUNLOCK(&udbinfo);
727 return 0;
728 }
729
730 static int
731 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
732 struct mbuf *control, struct thread *td)
733 {
734 struct inpcb *inp;
735 int error = 0;
736
737 INP_INFO_WLOCK(&udbinfo);
738 inp = sotoinpcb(so);
739 if (inp == 0) {
740 INP_INFO_WUNLOCK(&udbinfo);
741 m_freem(m);
742 return EINVAL;
743 }
744 INP_LOCK(inp);
745
746 if (addr) {
747 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
748 error = EINVAL;
749 goto bad;
750 }
751 if (addr->sa_family != AF_INET6) {
752 error = EAFNOSUPPORT;
753 goto bad;
754 }
755 }
756
757 #ifdef INET
758 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
759 int hasv4addr;
760 struct sockaddr_in6 *sin6 = 0;
761
762 if (addr == 0)
763 hasv4addr = (inp->inp_vflag & INP_IPV4);
764 else {
765 sin6 = (struct sockaddr_in6 *)addr;
766 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
767 ? 1 : 0;
768 }
769 if (hasv4addr) {
770 struct pr_usrreqs *pru;
771
772 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
773 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
774 /*
775 * when remote addr is IPv4-mapped
776 * address, local addr should not be
777 * an IPv6 address; since you cannot
778 * determine how to map IPv6 source
779 * address to IPv4.
780 */
781 error = EINVAL;
782 goto out;
783 }
784 if (sin6)
785 in6_sin6_2_sin_in_sock(addr);
786 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
787 error = ((*pru->pru_send)(so, flags, m, addr, control,
788 td));
789 /* addr will just be freed in sendit(). */
790 goto out;
791 }
792 }
793 #endif
794
795 error = udp6_output(inp, m, addr, control, td);
796 out:
797 INP_UNLOCK(inp);
798 INP_INFO_WUNLOCK(&udbinfo);
799 return error;
800
801 bad:
802 INP_UNLOCK(inp);
803 INP_INFO_WUNLOCK(&udbinfo);
804 m_freem(m);
805 return (error);
806 }
807
808 struct pr_usrreqs udp6_usrreqs = {
809 .pru_abort = udp6_abort,
810 .pru_attach = udp6_attach,
811 .pru_bind = udp6_bind,
812 .pru_connect = udp6_connect,
813 .pru_control = in6_control,
814 .pru_detach = udp6_detach,
815 .pru_disconnect = udp6_disconnect,
816 .pru_peeraddr = in6_mapped_peeraddr,
817 .pru_send = udp6_send,
818 .pru_shutdown = udp_shutdown,
819 .pru_sockaddr = in6_mapped_sockaddr,
820 .pru_sosetlabel = in_pcbsosetlabel
821 };
Cache object: 0ca16709c62ceb33f1f613fc09ba6041
|