1/* $FreeBSD: head/sys/netinet6/udp6_usrreq.c 91354 2002-02-27 04:45:37Z dd $ */
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 * 3. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
66 */
67
68#include "opt_inet.h"
69#include "opt_inet6.h"
70#include "opt_ipsec.h"
71
72#include <sys/param.h>
73#include <sys/kernel.h>
74#include <sys/mbuf.h>
75#include <sys/protosw.h>
76#include <sys/socket.h>
77#include <sys/socketvar.h>
78#include <sys/sysctl.h>
79#include <sys/errno.h>
80#include <sys/stat.h>
81#include <sys/systm.h>
82#include <sys/syslog.h>
83#include <sys/proc.h>
84
85#include <net/if.h>
86#include <net/route.h>
87#include <net/if_types.h>
88
89#include <netinet/in.h>
90#include <netinet/in_systm.h>
91#include <netinet/ip.h>
92#include <netinet/in_pcb.h>
93#include <netinet/in_var.h>
94#include <netinet/ip_var.h>
95#include <netinet/udp.h>
96#include <netinet/udp_var.h>
97#include <netinet/ip6.h>
98#include <netinet6/ip6_var.h>
99#include <netinet6/in6_pcb.h>
100#include <netinet/icmp6.h>
101#include <netinet6/udp6_var.h>
102#include <netinet6/ip6protosw.h>
103
104#ifdef IPSEC
105#include <netinet6/ipsec.h>
106#include <netinet6/ipsec6.h>
107#endif /*IPSEC*/
108
109/*
110 * UDP protocol inplementation.
111 * Per RFC 768, August, 1980.
112 */
113
114extern struct protosw inetsw[];
115static int in6_mcmatch __P((struct inpcb *, struct in6_addr *, struct ifnet *));
116static int udp6_detach __P((struct socket *so));
117
118static int
119in6_mcmatch(in6p, ia6, ifp)
120 struct inpcb *in6p;
121 register struct in6_addr *ia6;
122 struct ifnet *ifp;
123{
124 struct ip6_moptions *im6o = in6p->in6p_moptions;
125 struct in6_multi_mship *imm;
126
127 if (im6o == NULL)
128 return 0;
129
130 for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
131 imm = imm->i6mm_chain.le_next) {
132 if ((ifp == NULL ||
133 imm->i6mm_maddr->in6m_ifp == ifp) &&
134 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
135 ia6))
136 return 1;
137 }
138 return 0;
139}
140
141int
142udp6_input(mp, offp, proto)
143 struct mbuf **mp;
144 int *offp, proto;
145{
146 struct mbuf *m = *mp;
147 register struct ip6_hdr *ip6;
148 register struct udphdr *uh;
149 register struct inpcb *in6p;
150 struct mbuf *opts = NULL;
151 int off = *offp;
152 int plen, ulen;
153 struct sockaddr_in6 udp_in6;
154
155 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
156
157 ip6 = mtod(m, struct ip6_hdr *);
158
159 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
160 /* XXX send icmp6 host/port unreach? */
161 m_freem(m);
162 return IPPROTO_DONE;
163 }
164
165 udpstat.udps_ipackets++;
166
167 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
168 uh = (struct udphdr *)((caddr_t)ip6 + off);
169 ulen = ntohs((u_short)uh->uh_ulen);
170
171 if (plen != ulen) {
172 udpstat.udps_badlen++;
173 goto bad;
174 }
175
176 /*
177 * Checksum extended UDP header and data.
178 */
179 if (uh->uh_sum == 0)
180 udpstat.udps_nosum++;
181 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
182 udpstat.udps_badsum++;
183 goto bad;
184 }
185
186 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
187 struct inpcb *last;
188
189 /*
190 * Deliver a multicast datagram to all sockets
191 * for which the local and remote addresses and ports match
192 * those of the incoming datagram. This allows more than
193 * one process to receive multicasts on the same port.
194 * (This really ought to be done for unicast datagrams as
195 * well, but that would cause problems with existing
196 * applications that open both address-specific sockets and
197 * a wildcard socket listening to the same port -- they would
198 * end up receiving duplicates of every unicast datagram.
199 * Those applications open the multiple sockets to overcome an
200 * inadequacy of the UDP socket interface, but for backwards
201 * compatibility we avoid the problem here rather than
202 * fixing the interface. Maybe 4.5BSD will remedy this?)
203 */
204
205 /*
206 * In a case that laddr should be set to the link-local
207 * address (this happens in RIPng), the multicast address
208 * specified in the received packet does not match with
209 * laddr. To cure this situation, the matching is relaxed
210 * if the receiving interface is the same as one specified
211 * in the socket and if the destination multicast address
212 * matches one of the multicast groups specified in the socket.
213 */
214
215 /*
216 * Construct sockaddr format source address.
217 */
218 init_sin6(&udp_in6, m); /* general init */
219 udp_in6.sin6_port = uh->uh_sport;
220 /*
221 * KAME note: usually we drop udphdr from mbuf here.
222 * We need udphdr for IPsec processing so we do that later.
223 */
224
225 /*
226 * Locate pcb(s) for datagram.
227 * (Algorithm copied from raw_intr().)
228 */
229 last = NULL;
230 LIST_FOREACH(in6p, &udb, inp_list) {
231 if ((in6p->inp_vflag & INP_IPV6) == 0)
232 continue;
233 if (in6p->in6p_lport != uh->uh_dport)
234 continue;
235 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
236 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
237 &ip6->ip6_dst) &&
238 !in6_mcmatch(in6p, &ip6->ip6_dst,
239 m->m_pkthdr.rcvif))
240 continue;
241 }
242 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
243 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
244 &ip6->ip6_src) ||
245 in6p->in6p_fport != uh->uh_sport)
246 continue;
247 }
248
249 if (last != NULL) {
250 struct mbuf *n;
251
252#ifdef IPSEC
253 /*
254 * Check AH/ESP integrity.
255 */
256 if (ipsec6_in_reject_so(m, last->inp_socket))
257 ipsec6stat.in_polvio++;
258 /* do not inject data into pcb */
259 else
260#endif /*IPSEC*/
261 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
262 /*
263 * KAME NOTE: do not
264 * m_copy(m, offset, ...) above.
265 * sbappendaddr() expects M_PKTHDR,
266 * and m_copy() will copy M_PKTHDR
267 * only if offset is 0.
268 */
269 if (last->in6p_flags & IN6P_CONTROLOPTS
270 || last->in6p_socket->so_options & SO_TIMESTAMP)
271 ip6_savecontrol(last, &opts,
272 ip6, n);
273
274 m_adj(n, off + sizeof(struct udphdr));
275 if (sbappendaddr(&last->in6p_socket->so_rcv,
276 (struct sockaddr *)&udp_in6,
277 n, opts) == 0) {
278 m_freem(n);
279 if (opts)
280 m_freem(opts);
281 udpstat.udps_fullsock++;
282 } else
283 sorwakeup(last->in6p_socket);
284 opts = NULL;
285 }
286 }
287 last = in6p;
288 /*
289 * Don't look for additional matches if this one does
290 * not have either the SO_REUSEPORT or SO_REUSEADDR
291 * socket options set. This heuristic avoids searching
292 * through all pcbs in the common case of a non-shared
293 * port. It assumes that an application will never
294 * clear these options after setting them.
295 */
296 if ((last->in6p_socket->so_options &
297 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
298 break;
299 }
300
301 if (last == NULL) {
302 /*
303 * No matching pcb found; discard datagram.
304 * (No need to send an ICMP Port Unreachable
305 * for a broadcast or multicast datgram.)
306 */
307 udpstat.udps_noport++;
308 udpstat.udps_noportmcast++;
309 goto bad;
310 }
311#ifdef IPSEC
312 /*
313 * Check AH/ESP integrity.
314 */
315 if (ipsec6_in_reject_so(m, last->inp_socket)) {
316 ipsec6stat.in_polvio++;
317 goto bad;
318 }
319#endif /*IPSEC*/
320 if (last->in6p_flags & IN6P_CONTROLOPTS
321 || last->in6p_socket->so_options & SO_TIMESTAMP)
322 ip6_savecontrol(last, &opts, ip6, m);
323
324 m_adj(m, off + sizeof(struct udphdr));
325 if (sbappendaddr(&last->in6p_socket->so_rcv,
326 (struct sockaddr *)&udp_in6,
327 m, opts) == 0) {
328 udpstat.udps_fullsock++;
329 goto bad;
330 }
331 sorwakeup(last->in6p_socket);
332 return IPPROTO_DONE;
333 }
334 /*
335 * Locate pcb for datagram.
336 */
337 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
338 &ip6->ip6_dst, uh->uh_dport, 1,
339 m->m_pkthdr.rcvif);
340 if (in6p == 0) {
341 if (log_in_vain) {
342 char buf[INET6_ADDRSTRLEN];
343
344 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
345 log(LOG_INFO,
346 "Connection attempt to UDP %s:%d from %s:%d\n",
347 buf, ntohs(uh->uh_dport),
348 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
349 }
350 udpstat.udps_noport++;
351 if (m->m_flags & M_MCAST) {
352 printf("UDP6: M_MCAST is set in a unicast packet.\n");
353 udpstat.udps_noportmcast++;
354 goto bad;
355 }
356 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
357 return IPPROTO_DONE;
358 }
359#ifdef IPSEC
360 /*
361 * Check AH/ESP integrity.
362 */
363 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
364 ipsec6stat.in_polvio++;
365 goto bad;
366 }
367#endif /*IPSEC*/
368
369 /*
370 * Construct sockaddr format source address.
371 * Stuff source address and datagram in user buffer.
372 */
373 init_sin6(&udp_in6, m); /* general init */
374 udp_in6.sin6_port = uh->uh_sport;
375 if (in6p->in6p_flags & IN6P_CONTROLOPTS
376 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
377 ip6_savecontrol(in6p, &opts, ip6, m);
378 m_adj(m, off + sizeof(struct udphdr));
379 if (sbappendaddr(&in6p->in6p_socket->so_rcv,
380 (struct sockaddr *)&udp_in6,
381 m, opts) == 0) {
382 udpstat.udps_fullsock++;
383 goto bad;
384 }
385 sorwakeup(in6p->in6p_socket);
386 return IPPROTO_DONE;
387bad:
388 if (m)
389 m_freem(m);
390 if (opts)
391 m_freem(opts);
392 return IPPROTO_DONE;
393}
394
395void
396udp6_ctlinput(cmd, sa, d)
397 int cmd;
398 struct sockaddr *sa;
399 void *d;
400{
401 struct udphdr uh;
402 struct ip6_hdr *ip6;
403 struct mbuf *m;
404 int off = 0;
405 struct ip6ctlparam *ip6cp = NULL;
406 const struct sockaddr_in6 *sa6_src = NULL;
407 void (*notify) __P((struct inpcb *, int)) = udp_notify;
408 struct udp_portonly {
409 u_int16_t uh_sport;
410 u_int16_t uh_dport;
411 } *uhp;
412
413 if (sa->sa_family != AF_INET6 ||
414 sa->sa_len != sizeof(struct sockaddr_in6))
415 return;
416
417 if ((unsigned)cmd >= PRC_NCMDS)
418 return;
419 if (PRC_IS_REDIRECT(cmd))
420 notify = in6_rtchange, d = NULL;
421 else if (cmd == PRC_HOSTDEAD)
422 d = NULL;
423 else if (inet6ctlerrmap[cmd] == 0)
424 return;
425
426 /* if the parameter is from icmp6, decode it. */
427 if (d != NULL) {
428 ip6cp = (struct ip6ctlparam *)d;
429 m = ip6cp->ip6c_m;
430 ip6 = ip6cp->ip6c_ip6;
431 off = ip6cp->ip6c_off;
432 sa6_src = ip6cp->ip6c_src;
433 } else {
434 m = NULL;
435 ip6 = NULL;
436 sa6_src = &sa6_any;
437 }
438
439 if (ip6) {
440 /*
441 * XXX: We assume that when IPV6 is non NULL,
442 * M and OFF are valid.
443 */
444
445 /* check if we can safely examine src and dst ports */
446 if (m->m_pkthdr.len < off + sizeof(*uhp))
447 return;
448
449 bzero(&uh, sizeof(uh));
450 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
451
452 (void) in6_pcbnotify(&udb, sa, uh.uh_dport,
453 (struct sockaddr *)ip6cp->ip6c_src,
454 uh.uh_sport, cmd, notify);
455 } else
456 (void) in6_pcbnotify(&udb, sa, 0,
457 (const struct sockaddr *)sa6_src,
458 0, cmd, notify);
459}
460
461static int
462udp6_getcred(SYSCTL_HANDLER_ARGS)
463{
464 struct xucred xuc;
465 struct sockaddr_in6 addrs[2];
466 struct inpcb *inp;
467 int error, s;
468
469 error = suser(req->td->td_proc);
470 if (error)
471 return (error);
472
473 if (req->newlen != sizeof(addrs))
474 return (EINVAL);
475 if (req->oldlen != sizeof(struct xucred))
476 return (EINVAL);
477 error = SYSCTL_IN(req, addrs, sizeof(addrs));
478 if (error)
479 return (error);
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));
491out:
492 splx(s);
493 return (error);
494}
495
496SYSCTL_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
500static int
501udp6_abort(struct socket *so)
502{
503 struct inpcb *inp;
504 int s;
505
506 inp = sotoinpcb(so);
507 if (inp == 0)
508 return EINVAL; /* ??? possible? panic instead? */
509 soisdisconnected(so);
510 s = splnet();
511 in6_pcbdetach(inp);
512 splx(s);
513 return 0;
514}
515
516static int
517udp6_attach(struct socket *so, int proto, struct thread *td)
518{
519 struct inpcb *inp;
520 int s, error;
521
522 inp = sotoinpcb(so);
523 if (inp != 0)
524 return EINVAL;
525
526 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
527 error = soreserve(so, udp_sendspace, udp_recvspace);
528 if (error)
529 return error;
530 }
531 s = splnet();
532 error = in_pcballoc(so, &udbinfo, td);
533 splx(s);
534 if (error)
535 return error;
536 inp = (struct inpcb *)so->so_pcb;
537 inp->inp_vflag |= INP_IPV6;
538 inp->in6p_hops = -1; /* use kernel default */
539 inp->in6p_cksum = -1; /* just to be sure */
540 /*
541 * XXX: ugly!!
542 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
543 * because the socket may be bound to an IPv6 wildcard address,
544 * which may match an IPv4-mapped IPv6 address.
545 */
546 inp->inp_ip_ttl = ip_defttl;
547 return 0;
548}
549
550static int
551udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
552{
553 struct inpcb *inp;
554 int s, error;
555
556 inp = sotoinpcb(so);
557 if (inp == 0)
558 return EINVAL;
559
560 inp->inp_vflag &= ~INP_IPV4;
561 inp->inp_vflag |= INP_IPV6;
562 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
563 struct sockaddr_in6 *sin6_p;
564
565 sin6_p = (struct sockaddr_in6 *)nam;
566
567 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
568 inp->inp_vflag |= INP_IPV4;
569 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
570 struct sockaddr_in sin;
571
572 in6_sin6_2_sin(&sin, sin6_p);
573 inp->inp_vflag |= INP_IPV4;
574 inp->inp_vflag &= ~INP_IPV6;
575 s = splnet();
576 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
577 splx(s);
578 return error;
579 }
580 }
581
582 s = splnet();
583 error = in6_pcbbind(inp, nam, td);
584 splx(s);
585 return error;
586}
587
588static int
589udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
590{
591 struct inpcb *inp;
592 int s, error;
593
594 inp = sotoinpcb(so);
595 if (inp == 0)
596 return EINVAL;
597
598 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
599 struct sockaddr_in6 *sin6_p;
600
601 sin6_p = (struct sockaddr_in6 *)nam;
602 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
603 struct sockaddr_in sin;
604
605 if (inp->inp_faddr.s_addr != INADDR_ANY)
606 return EISCONN;
607 in6_sin6_2_sin(&sin, sin6_p);
608 s = splnet();
609 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
610 splx(s);
611 if (error == 0) {
612 inp->inp_vflag |= INP_IPV4;
613 inp->inp_vflag &= ~INP_IPV6;
614 soisconnected(so);
615 }
616 return error;
617 }
618 }
619
620 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
621 return EISCONN;
622 s = splnet();
623 error = in6_pcbconnect(inp, nam, td);
624 splx(s);
625 if (error == 0) {
626 if (ip6_mapped_addr_on) { /* should be non mapped addr */
627 inp->inp_vflag &= ~INP_IPV4;
628 inp->inp_vflag |= INP_IPV6;
629 }
630 soisconnected(so);
631 }
632 return error;
633}
634
635static int
636udp6_detach(struct socket *so)
637{
638 struct inpcb *inp;
639 int s;
640
641 inp = sotoinpcb(so);
642 if (inp == 0)
643 return EINVAL;
644 s = splnet();
645 in6_pcbdetach(inp);
646 splx(s);
647 return 0;
648}
649
650static int
651udp6_disconnect(struct socket *so)
652{
653 struct inpcb *inp;
654 int s;
655
656 inp = sotoinpcb(so);
657 if (inp == 0)
658 return EINVAL;
659
660 if (inp->inp_vflag & INP_IPV4) {
661 struct pr_usrreqs *pru;
662
663 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
664 return ((*pru->pru_disconnect)(so));
665 }
666
667 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
668 return ENOTCONN;
669
670 s = splnet();
671 in6_pcbdisconnect(inp);
672 inp->in6p_laddr = in6addr_any;
673 splx(s);
674 so->so_state &= ~SS_ISCONNECTED; /* XXX */
675 return 0;
676}
677
678static int
679udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
680 struct mbuf *control, struct thread *td)
681{
682 struct inpcb *inp;
683 int error = 0;
684
685 inp = sotoinpcb(so);
686 if (inp == 0) {
687 error = EINVAL;
688 goto bad;
689 }
690
691 if (addr) {
692 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
693 error = EINVAL;
694 goto bad;
695 }
696 if (addr->sa_family != AF_INET6) {
697 error = EAFNOSUPPORT;
698 goto bad;
699 }
700 }
701
702 if (ip6_mapped_addr_on) {
703 int hasv4addr;
704 struct sockaddr_in6 *sin6 = 0;
705
706 if (addr == 0)
707 hasv4addr = (inp->inp_vflag & INP_IPV4);
708 else {
709 sin6 = (struct sockaddr_in6 *)addr;
710 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
711 ? 1 : 0;
712 }
713 if (hasv4addr) {
714 struct pr_usrreqs *pru;
715
716 if (sin6)
717 in6_sin6_2_sin_in_sock(addr);
718 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
719 error = ((*pru->pru_send)(so, flags, m, addr, control,
720 td));
721 /* addr will just be freed in sendit(). */
722 return error;
723 }
724 }
725
726 return udp6_output(inp, m, addr, control, td);
727
728 bad:
729 m_freem(m);
730 return(error);
731}
732
733struct pr_usrreqs udp6_usrreqs = {
734 udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
735 pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
736 pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
737 pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
738 in6_mapped_sockaddr, sosend, soreceive, sopoll
739};
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 * 3. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
66 */
67
68#include "opt_inet.h"
69#include "opt_inet6.h"
70#include "opt_ipsec.h"
71
72#include <sys/param.h>
73#include <sys/kernel.h>
74#include <sys/mbuf.h>
75#include <sys/protosw.h>
76#include <sys/socket.h>
77#include <sys/socketvar.h>
78#include <sys/sysctl.h>
79#include <sys/errno.h>
80#include <sys/stat.h>
81#include <sys/systm.h>
82#include <sys/syslog.h>
83#include <sys/proc.h>
84
85#include <net/if.h>
86#include <net/route.h>
87#include <net/if_types.h>
88
89#include <netinet/in.h>
90#include <netinet/in_systm.h>
91#include <netinet/ip.h>
92#include <netinet/in_pcb.h>
93#include <netinet/in_var.h>
94#include <netinet/ip_var.h>
95#include <netinet/udp.h>
96#include <netinet/udp_var.h>
97#include <netinet/ip6.h>
98#include <netinet6/ip6_var.h>
99#include <netinet6/in6_pcb.h>
100#include <netinet/icmp6.h>
101#include <netinet6/udp6_var.h>
102#include <netinet6/ip6protosw.h>
103
104#ifdef IPSEC
105#include <netinet6/ipsec.h>
106#include <netinet6/ipsec6.h>
107#endif /*IPSEC*/
108
109/*
110 * UDP protocol inplementation.
111 * Per RFC 768, August, 1980.
112 */
113
114extern struct protosw inetsw[];
115static int in6_mcmatch __P((struct inpcb *, struct in6_addr *, struct ifnet *));
116static int udp6_detach __P((struct socket *so));
117
118static int
119in6_mcmatch(in6p, ia6, ifp)
120 struct inpcb *in6p;
121 register struct in6_addr *ia6;
122 struct ifnet *ifp;
123{
124 struct ip6_moptions *im6o = in6p->in6p_moptions;
125 struct in6_multi_mship *imm;
126
127 if (im6o == NULL)
128 return 0;
129
130 for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
131 imm = imm->i6mm_chain.le_next) {
132 if ((ifp == NULL ||
133 imm->i6mm_maddr->in6m_ifp == ifp) &&
134 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
135 ia6))
136 return 1;
137 }
138 return 0;
139}
140
141int
142udp6_input(mp, offp, proto)
143 struct mbuf **mp;
144 int *offp, proto;
145{
146 struct mbuf *m = *mp;
147 register struct ip6_hdr *ip6;
148 register struct udphdr *uh;
149 register struct inpcb *in6p;
150 struct mbuf *opts = NULL;
151 int off = *offp;
152 int plen, ulen;
153 struct sockaddr_in6 udp_in6;
154
155 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
156
157 ip6 = mtod(m, struct ip6_hdr *);
158
159 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
160 /* XXX send icmp6 host/port unreach? */
161 m_freem(m);
162 return IPPROTO_DONE;
163 }
164
165 udpstat.udps_ipackets++;
166
167 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
168 uh = (struct udphdr *)((caddr_t)ip6 + off);
169 ulen = ntohs((u_short)uh->uh_ulen);
170
171 if (plen != ulen) {
172 udpstat.udps_badlen++;
173 goto bad;
174 }
175
176 /*
177 * Checksum extended UDP header and data.
178 */
179 if (uh->uh_sum == 0)
180 udpstat.udps_nosum++;
181 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
182 udpstat.udps_badsum++;
183 goto bad;
184 }
185
186 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
187 struct inpcb *last;
188
189 /*
190 * Deliver a multicast datagram to all sockets
191 * for which the local and remote addresses and ports match
192 * those of the incoming datagram. This allows more than
193 * one process to receive multicasts on the same port.
194 * (This really ought to be done for unicast datagrams as
195 * well, but that would cause problems with existing
196 * applications that open both address-specific sockets and
197 * a wildcard socket listening to the same port -- they would
198 * end up receiving duplicates of every unicast datagram.
199 * Those applications open the multiple sockets to overcome an
200 * inadequacy of the UDP socket interface, but for backwards
201 * compatibility we avoid the problem here rather than
202 * fixing the interface. Maybe 4.5BSD will remedy this?)
203 */
204
205 /*
206 * In a case that laddr should be set to the link-local
207 * address (this happens in RIPng), the multicast address
208 * specified in the received packet does not match with
209 * laddr. To cure this situation, the matching is relaxed
210 * if the receiving interface is the same as one specified
211 * in the socket and if the destination multicast address
212 * matches one of the multicast groups specified in the socket.
213 */
214
215 /*
216 * Construct sockaddr format source address.
217 */
218 init_sin6(&udp_in6, m); /* general init */
219 udp_in6.sin6_port = uh->uh_sport;
220 /*
221 * KAME note: usually we drop udphdr from mbuf here.
222 * We need udphdr for IPsec processing so we do that later.
223 */
224
225 /*
226 * Locate pcb(s) for datagram.
227 * (Algorithm copied from raw_intr().)
228 */
229 last = NULL;
230 LIST_FOREACH(in6p, &udb, inp_list) {
231 if ((in6p->inp_vflag & INP_IPV6) == 0)
232 continue;
233 if (in6p->in6p_lport != uh->uh_dport)
234 continue;
235 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
236 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
237 &ip6->ip6_dst) &&
238 !in6_mcmatch(in6p, &ip6->ip6_dst,
239 m->m_pkthdr.rcvif))
240 continue;
241 }
242 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
243 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
244 &ip6->ip6_src) ||
245 in6p->in6p_fport != uh->uh_sport)
246 continue;
247 }
248
249 if (last != NULL) {
250 struct mbuf *n;
251
252#ifdef IPSEC
253 /*
254 * Check AH/ESP integrity.
255 */
256 if (ipsec6_in_reject_so(m, last->inp_socket))
257 ipsec6stat.in_polvio++;
258 /* do not inject data into pcb */
259 else
260#endif /*IPSEC*/
261 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
262 /*
263 * KAME NOTE: do not
264 * m_copy(m, offset, ...) above.
265 * sbappendaddr() expects M_PKTHDR,
266 * and m_copy() will copy M_PKTHDR
267 * only if offset is 0.
268 */
269 if (last->in6p_flags & IN6P_CONTROLOPTS
270 || last->in6p_socket->so_options & SO_TIMESTAMP)
271 ip6_savecontrol(last, &opts,
272 ip6, n);
273
274 m_adj(n, off + sizeof(struct udphdr));
275 if (sbappendaddr(&last->in6p_socket->so_rcv,
276 (struct sockaddr *)&udp_in6,
277 n, opts) == 0) {
278 m_freem(n);
279 if (opts)
280 m_freem(opts);
281 udpstat.udps_fullsock++;
282 } else
283 sorwakeup(last->in6p_socket);
284 opts = NULL;
285 }
286 }
287 last = in6p;
288 /*
289 * Don't look for additional matches if this one does
290 * not have either the SO_REUSEPORT or SO_REUSEADDR
291 * socket options set. This heuristic avoids searching
292 * through all pcbs in the common case of a non-shared
293 * port. It assumes that an application will never
294 * clear these options after setting them.
295 */
296 if ((last->in6p_socket->so_options &
297 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
298 break;
299 }
300
301 if (last == NULL) {
302 /*
303 * No matching pcb found; discard datagram.
304 * (No need to send an ICMP Port Unreachable
305 * for a broadcast or multicast datgram.)
306 */
307 udpstat.udps_noport++;
308 udpstat.udps_noportmcast++;
309 goto bad;
310 }
311#ifdef IPSEC
312 /*
313 * Check AH/ESP integrity.
314 */
315 if (ipsec6_in_reject_so(m, last->inp_socket)) {
316 ipsec6stat.in_polvio++;
317 goto bad;
318 }
319#endif /*IPSEC*/
320 if (last->in6p_flags & IN6P_CONTROLOPTS
321 || last->in6p_socket->so_options & SO_TIMESTAMP)
322 ip6_savecontrol(last, &opts, ip6, m);
323
324 m_adj(m, off + sizeof(struct udphdr));
325 if (sbappendaddr(&last->in6p_socket->so_rcv,
326 (struct sockaddr *)&udp_in6,
327 m, opts) == 0) {
328 udpstat.udps_fullsock++;
329 goto bad;
330 }
331 sorwakeup(last->in6p_socket);
332 return IPPROTO_DONE;
333 }
334 /*
335 * Locate pcb for datagram.
336 */
337 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
338 &ip6->ip6_dst, uh->uh_dport, 1,
339 m->m_pkthdr.rcvif);
340 if (in6p == 0) {
341 if (log_in_vain) {
342 char buf[INET6_ADDRSTRLEN];
343
344 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
345 log(LOG_INFO,
346 "Connection attempt to UDP %s:%d from %s:%d\n",
347 buf, ntohs(uh->uh_dport),
348 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
349 }
350 udpstat.udps_noport++;
351 if (m->m_flags & M_MCAST) {
352 printf("UDP6: M_MCAST is set in a unicast packet.\n");
353 udpstat.udps_noportmcast++;
354 goto bad;
355 }
356 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
357 return IPPROTO_DONE;
358 }
359#ifdef IPSEC
360 /*
361 * Check AH/ESP integrity.
362 */
363 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
364 ipsec6stat.in_polvio++;
365 goto bad;
366 }
367#endif /*IPSEC*/
368
369 /*
370 * Construct sockaddr format source address.
371 * Stuff source address and datagram in user buffer.
372 */
373 init_sin6(&udp_in6, m); /* general init */
374 udp_in6.sin6_port = uh->uh_sport;
375 if (in6p->in6p_flags & IN6P_CONTROLOPTS
376 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
377 ip6_savecontrol(in6p, &opts, ip6, m);
378 m_adj(m, off + sizeof(struct udphdr));
379 if (sbappendaddr(&in6p->in6p_socket->so_rcv,
380 (struct sockaddr *)&udp_in6,
381 m, opts) == 0) {
382 udpstat.udps_fullsock++;
383 goto bad;
384 }
385 sorwakeup(in6p->in6p_socket);
386 return IPPROTO_DONE;
387bad:
388 if (m)
389 m_freem(m);
390 if (opts)
391 m_freem(opts);
392 return IPPROTO_DONE;
393}
394
395void
396udp6_ctlinput(cmd, sa, d)
397 int cmd;
398 struct sockaddr *sa;
399 void *d;
400{
401 struct udphdr uh;
402 struct ip6_hdr *ip6;
403 struct mbuf *m;
404 int off = 0;
405 struct ip6ctlparam *ip6cp = NULL;
406 const struct sockaddr_in6 *sa6_src = NULL;
407 void (*notify) __P((struct inpcb *, int)) = udp_notify;
408 struct udp_portonly {
409 u_int16_t uh_sport;
410 u_int16_t uh_dport;
411 } *uhp;
412
413 if (sa->sa_family != AF_INET6 ||
414 sa->sa_len != sizeof(struct sockaddr_in6))
415 return;
416
417 if ((unsigned)cmd >= PRC_NCMDS)
418 return;
419 if (PRC_IS_REDIRECT(cmd))
420 notify = in6_rtchange, d = NULL;
421 else if (cmd == PRC_HOSTDEAD)
422 d = NULL;
423 else if (inet6ctlerrmap[cmd] == 0)
424 return;
425
426 /* if the parameter is from icmp6, decode it. */
427 if (d != NULL) {
428 ip6cp = (struct ip6ctlparam *)d;
429 m = ip6cp->ip6c_m;
430 ip6 = ip6cp->ip6c_ip6;
431 off = ip6cp->ip6c_off;
432 sa6_src = ip6cp->ip6c_src;
433 } else {
434 m = NULL;
435 ip6 = NULL;
436 sa6_src = &sa6_any;
437 }
438
439 if (ip6) {
440 /*
441 * XXX: We assume that when IPV6 is non NULL,
442 * M and OFF are valid.
443 */
444
445 /* check if we can safely examine src and dst ports */
446 if (m->m_pkthdr.len < off + sizeof(*uhp))
447 return;
448
449 bzero(&uh, sizeof(uh));
450 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
451
452 (void) in6_pcbnotify(&udb, sa, uh.uh_dport,
453 (struct sockaddr *)ip6cp->ip6c_src,
454 uh.uh_sport, cmd, notify);
455 } else
456 (void) in6_pcbnotify(&udb, sa, 0,
457 (const struct sockaddr *)sa6_src,
458 0, cmd, notify);
459}
460
461static int
462udp6_getcred(SYSCTL_HANDLER_ARGS)
463{
464 struct xucred xuc;
465 struct sockaddr_in6 addrs[2];
466 struct inpcb *inp;
467 int error, s;
468
469 error = suser(req->td->td_proc);
470 if (error)
471 return (error);
472
473 if (req->newlen != sizeof(addrs))
474 return (EINVAL);
475 if (req->oldlen != sizeof(struct xucred))
476 return (EINVAL);
477 error = SYSCTL_IN(req, addrs, sizeof(addrs));
478 if (error)
479 return (error);
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));
491out:
492 splx(s);
493 return (error);
494}
495
496SYSCTL_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
500static int
501udp6_abort(struct socket *so)
502{
503 struct inpcb *inp;
504 int s;
505
506 inp = sotoinpcb(so);
507 if (inp == 0)
508 return EINVAL; /* ??? possible? panic instead? */
509 soisdisconnected(so);
510 s = splnet();
511 in6_pcbdetach(inp);
512 splx(s);
513 return 0;
514}
515
516static int
517udp6_attach(struct socket *so, int proto, struct thread *td)
518{
519 struct inpcb *inp;
520 int s, error;
521
522 inp = sotoinpcb(so);
523 if (inp != 0)
524 return EINVAL;
525
526 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
527 error = soreserve(so, udp_sendspace, udp_recvspace);
528 if (error)
529 return error;
530 }
531 s = splnet();
532 error = in_pcballoc(so, &udbinfo, td);
533 splx(s);
534 if (error)
535 return error;
536 inp = (struct inpcb *)so->so_pcb;
537 inp->inp_vflag |= INP_IPV6;
538 inp->in6p_hops = -1; /* use kernel default */
539 inp->in6p_cksum = -1; /* just to be sure */
540 /*
541 * XXX: ugly!!
542 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
543 * because the socket may be bound to an IPv6 wildcard address,
544 * which may match an IPv4-mapped IPv6 address.
545 */
546 inp->inp_ip_ttl = ip_defttl;
547 return 0;
548}
549
550static int
551udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
552{
553 struct inpcb *inp;
554 int s, error;
555
556 inp = sotoinpcb(so);
557 if (inp == 0)
558 return EINVAL;
559
560 inp->inp_vflag &= ~INP_IPV4;
561 inp->inp_vflag |= INP_IPV6;
562 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
563 struct sockaddr_in6 *sin6_p;
564
565 sin6_p = (struct sockaddr_in6 *)nam;
566
567 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
568 inp->inp_vflag |= INP_IPV4;
569 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
570 struct sockaddr_in sin;
571
572 in6_sin6_2_sin(&sin, sin6_p);
573 inp->inp_vflag |= INP_IPV4;
574 inp->inp_vflag &= ~INP_IPV6;
575 s = splnet();
576 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
577 splx(s);
578 return error;
579 }
580 }
581
582 s = splnet();
583 error = in6_pcbbind(inp, nam, td);
584 splx(s);
585 return error;
586}
587
588static int
589udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
590{
591 struct inpcb *inp;
592 int s, error;
593
594 inp = sotoinpcb(so);
595 if (inp == 0)
596 return EINVAL;
597
598 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
599 struct sockaddr_in6 *sin6_p;
600
601 sin6_p = (struct sockaddr_in6 *)nam;
602 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
603 struct sockaddr_in sin;
604
605 if (inp->inp_faddr.s_addr != INADDR_ANY)
606 return EISCONN;
607 in6_sin6_2_sin(&sin, sin6_p);
608 s = splnet();
609 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
610 splx(s);
611 if (error == 0) {
612 inp->inp_vflag |= INP_IPV4;
613 inp->inp_vflag &= ~INP_IPV6;
614 soisconnected(so);
615 }
616 return error;
617 }
618 }
619
620 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
621 return EISCONN;
622 s = splnet();
623 error = in6_pcbconnect(inp, nam, td);
624 splx(s);
625 if (error == 0) {
626 if (ip6_mapped_addr_on) { /* should be non mapped addr */
627 inp->inp_vflag &= ~INP_IPV4;
628 inp->inp_vflag |= INP_IPV6;
629 }
630 soisconnected(so);
631 }
632 return error;
633}
634
635static int
636udp6_detach(struct socket *so)
637{
638 struct inpcb *inp;
639 int s;
640
641 inp = sotoinpcb(so);
642 if (inp == 0)
643 return EINVAL;
644 s = splnet();
645 in6_pcbdetach(inp);
646 splx(s);
647 return 0;
648}
649
650static int
651udp6_disconnect(struct socket *so)
652{
653 struct inpcb *inp;
654 int s;
655
656 inp = sotoinpcb(so);
657 if (inp == 0)
658 return EINVAL;
659
660 if (inp->inp_vflag & INP_IPV4) {
661 struct pr_usrreqs *pru;
662
663 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
664 return ((*pru->pru_disconnect)(so));
665 }
666
667 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
668 return ENOTCONN;
669
670 s = splnet();
671 in6_pcbdisconnect(inp);
672 inp->in6p_laddr = in6addr_any;
673 splx(s);
674 so->so_state &= ~SS_ISCONNECTED; /* XXX */
675 return 0;
676}
677
678static int
679udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
680 struct mbuf *control, struct thread *td)
681{
682 struct inpcb *inp;
683 int error = 0;
684
685 inp = sotoinpcb(so);
686 if (inp == 0) {
687 error = EINVAL;
688 goto bad;
689 }
690
691 if (addr) {
692 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
693 error = EINVAL;
694 goto bad;
695 }
696 if (addr->sa_family != AF_INET6) {
697 error = EAFNOSUPPORT;
698 goto bad;
699 }
700 }
701
702 if (ip6_mapped_addr_on) {
703 int hasv4addr;
704 struct sockaddr_in6 *sin6 = 0;
705
706 if (addr == 0)
707 hasv4addr = (inp->inp_vflag & INP_IPV4);
708 else {
709 sin6 = (struct sockaddr_in6 *)addr;
710 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
711 ? 1 : 0;
712 }
713 if (hasv4addr) {
714 struct pr_usrreqs *pru;
715
716 if (sin6)
717 in6_sin6_2_sin_in_sock(addr);
718 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
719 error = ((*pru->pru_send)(so, flags, m, addr, control,
720 td));
721 /* addr will just be freed in sendit(). */
722 return error;
723 }
724 }
725
726 return udp6_output(inp, m, addr, control, td);
727
728 bad:
729 m_freem(m);
730 return(error);
731}
732
733struct pr_usrreqs udp6_usrreqs = {
734 udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
735 pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
736 pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
737 pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
738 in6_mapped_sockaddr, sosend, soreceive, sopoll
739};