Minimal patch that allows Path MTU discovery to be turned back on, but
[dragonfly.git] / sys / netinet6 / udp6_usrreq.c
1 /*      $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.13 2003/01/24 05:11:35 sam Exp $       */
2 /*      $DragonFly: src/sys/netinet6/udp6_usrreq.c,v 1.19 2005/03/06 05:09:25 hsu Exp $ */
3 /*      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $    */
4
5 /*
6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. Neither the name of the project nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33
34 /*
35  * Copyright (c) 1982, 1986, 1989, 1993
36  *      The Regents of the University of California.  All rights reserved.
37  *
38  * Redistribution and use in source and binary forms, with or without
39  * modification, are permitted provided that the following conditions
40  * are met:
41  * 1. Redistributions of source code must retain the above copyright
42  *    notice, this list of conditions and the following disclaimer.
43  * 2. Redistributions in binary form must reproduce the above copyright
44  *    notice, this list of conditions and the following disclaimer in the
45  *    documentation and/or other materials provided with the distribution.
46  * 3. All advertising materials mentioning features or use of this software
47  *    must display the following acknowledgement:
48  *      This product includes software developed by the University of
49  *      California, Berkeley and its contributors.
50  * 4. Neither the name of the University nor the names of its contributors
51  *    may be used to endorse or promote products derived from this software
52  *    without specific prior written permission.
53  *
54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64  * SUCH DAMAGE.
65  *
66  *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
67  */
68
69 #include "opt_inet.h"
70 #include "opt_inet6.h"
71 #include "opt_ipsec.h"
72
73 #include <sys/param.h>
74 #include <sys/kernel.h>
75 #include <sys/mbuf.h>
76 #include <sys/protosw.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/sysctl.h>
80 #include <sys/errno.h>
81 #include <sys/stat.h>
82 #include <sys/systm.h>
83 #include <sys/syslog.h>
84 #include <sys/proc.h>
85
86 #include <net/if.h>
87 #include <net/route.h>
88 #include <net/if_types.h>
89
90 #include <netinet/in.h>
91 #include <netinet/in_systm.h>
92 #include <netinet/ip.h>
93 #include <netinet/in_pcb.h>
94 #include <netinet/in_var.h>
95 #include <netinet/ip_var.h>
96 #include <netinet/udp.h>
97 #include <netinet/udp_var.h>
98 #include <netinet/ip6.h>
99 #include <netinet6/ip6_var.h>
100 #include <netinet6/in6_pcb.h>
101 #include <netinet/icmp6.h>
102 #include <netinet6/udp6_var.h>
103 #include <netinet6/ip6protosw.h>
104
105 #ifdef IPSEC
106 #include <netinet6/ipsec.h>
107 #include <netinet6/ipsec6.h>
108 #endif /* IPSEC */
109
110 #ifdef FAST_IPSEC
111 #include <netproto/ipsec/ipsec.h>
112 #include <netproto/ipsec/ipsec6.h>
113 #endif /* FAST_IPSEC */
114
115 /*
116  * UDP protocol inplementation.
117  * Per RFC 768, August, 1980.
118  */
119
120 extern  struct protosw inetsw[];
121 static  int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
122 static  int udp6_detach (struct socket *so);
123
124 static int
125 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
126 {
127         struct ip6_moptions *im6o = in6p->in6p_moptions;
128         struct in6_multi_mship *imm;
129
130         if (im6o == NULL)
131                 return 0;
132
133         for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
134              imm = imm->i6mm_chain.le_next) {
135                 if ((ifp == NULL ||
136                      imm->i6mm_maddr->in6m_ifp == ifp) &&
137                     IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
138                                        ia6))
139                         return 1;
140         }
141         return 0;
142 }
143
144 int
145 udp6_input(struct mbuf **mp, int *offp, int proto)
146 {
147         struct mbuf *m = *mp;
148         struct ip6_hdr *ip6;
149         struct udphdr *uh;
150         struct inpcb *in6p;
151         struct  mbuf *opts = NULL;
152         int off = *offp;
153         int plen, ulen;
154         struct sockaddr_in6 udp_in6;
155
156         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
157
158         ip6 = mtod(m, struct ip6_hdr *);
159
160         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
161                 /* XXX send icmp6 host/port unreach? */
162                 m_freem(m);
163                 return IPPROTO_DONE;
164         }
165
166         udpstat.udps_ipackets++;
167
168         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
169         uh = (struct udphdr *)((caddr_t)ip6 + off);
170         ulen = ntohs((u_short)uh->uh_ulen);
171
172         if (plen != ulen) {
173                 udpstat.udps_badlen++;
174                 goto bad;
175         }
176
177         /*
178          * Checksum extended UDP header and data.
179          */
180         if (uh->uh_sum == 0)
181                 udpstat.udps_nosum++;
182         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
183                 udpstat.udps_badsum++;
184                 goto bad;
185         }
186
187         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
188                 struct  inpcb *last;
189
190                 /*
191                  * Deliver a multicast datagram to all sockets
192                  * for which the local and remote addresses and ports match
193                  * those of the incoming datagram.  This allows more than
194                  * one process to receive multicasts on the same port.
195                  * (This really ought to be done for unicast datagrams as
196                  * well, but that would cause problems with existing
197                  * applications that open both address-specific sockets and
198                  * a wildcard socket listening to the same port -- they would
199                  * end up receiving duplicates of every unicast datagram.
200                  * Those applications open the multiple sockets to overcome an
201                  * inadequacy of the UDP socket interface, but for backwards
202                  * compatibility we avoid the problem here rather than
203                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
204                  */
205
206                 /*
207                  * In a case that laddr should be set to the link-local
208                  * address (this happens in RIPng), the multicast address
209                  * specified in the received packet does not match with
210                  * laddr. To cure this situation, the matching is relaxed
211                  * if the receiving interface is the same as one specified
212                  * in the socket and if the destination multicast address
213                  * matches one of the multicast groups specified in the socket.
214                  */
215
216                 /*
217                  * Construct sockaddr format source address.
218                  */
219                 init_sin6(&udp_in6, m); /* general init */
220                 udp_in6.sin6_port = uh->uh_sport;
221                 /*
222                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
223                  * We need udphdr for IPsec processing so we do that later.
224                  */
225
226                 /*
227                  * Locate pcb(s) for datagram.
228                  * (Algorithm copied from raw_intr().)
229                  */
230                 last = NULL;
231                 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) {
232                         if ((in6p->inp_flags & INP_PLACEMARKER) == 0)
233                                 continue;
234                         if ((in6p->inp_vflag & INP_IPV6) == 0)
235                                 continue;
236                         if (in6p->in6p_lport != uh->uh_dport)
237                                 continue;
238                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
239                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
240                                                         &ip6->ip6_dst) &&
241                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
242                                                  m->m_pkthdr.rcvif))
243                                         continue;
244                         }
245                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
246                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
247                                                         &ip6->ip6_src) ||
248                                    in6p->in6p_fport != uh->uh_sport)
249                                         continue;
250                         }
251
252                         if (last != NULL) {
253                                 struct  mbuf *n;
254
255 #ifdef IPSEC
256                                 /*
257                                  * Check AH/ESP integrity.
258                                  */
259                                 if (ipsec6_in_reject_so(m, last->inp_socket))
260                                         ipsec6stat.in_polvio++;
261                                         /* do not inject data into pcb */
262                                 else
263 #endif /* IPSEC */
264 #ifdef FAST_IPSEC
265                                 /*
266                                  * Check AH/ESP integrity.
267                                  */
268                                 if (ipsec6_in_reject(m, last))
269                                         ;
270                                 else
271 #endif /* FAST_IPSEC */
272                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
273                                         /*
274                                          * KAME NOTE: do not
275                                          * m_copy(m, offset, ...) above.
276                                          * sbappendaddr() expects M_PKTHDR,
277                                          * and m_copy() will copy M_PKTHDR
278                                          * only if offset is 0.
279                                          */
280                                         if (last->in6p_flags & IN6P_CONTROLOPTS
281                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
282                                                 ip6_savecontrol(last, &opts,
283                                                                 ip6, n);
284                                                                 
285                                         m_adj(n, off + sizeof(struct udphdr));
286                                         if (sbappendaddr(&last->in6p_socket->so_rcv,
287                                                         (struct sockaddr *)&udp_in6,
288                                                         n, opts) == 0) {
289                                                 m_freem(n);
290                                                 if (opts)
291                                                         m_freem(opts);
292                                                 udpstat.udps_fullsock++;
293                                         } else
294                                                 sorwakeup(last->in6p_socket);
295                                         opts = NULL;
296                                 }
297                         }
298                         last = in6p;
299                         /*
300                          * Don't look for additional matches if this one does
301                          * not have either the SO_REUSEPORT or SO_REUSEADDR
302                          * socket options set.  This heuristic avoids searching
303                          * through all pcbs in the common case of a non-shared
304                          * port.  It assumes that an application will never
305                          * clear these options after setting them.
306                          */
307                         if ((last->in6p_socket->so_options &
308                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
309                                 break;
310                 }
311
312                 if (last == NULL) {
313                         /*
314                          * No matching pcb found; discard datagram.
315                          * (No need to send an ICMP Port Unreachable
316                          * for a broadcast or multicast datgram.)
317                          */
318                         udpstat.udps_noport++;
319                         udpstat.udps_noportmcast++;
320                         goto bad;
321                 }
322 #ifdef IPSEC
323                 /*
324                  * Check AH/ESP integrity.
325                  */
326                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
327                         ipsec6stat.in_polvio++;
328                         goto bad;
329                 }
330 #endif /* IPSEC */
331 #ifdef FAST_IPSEC
332                 /*
333                  * Check AH/ESP integrity.
334                  */
335                 if (ipsec6_in_reject(m, last)) {
336                         goto bad;
337                 }
338 #endif /* FAST_IPSEC */
339                 if (last->in6p_flags & IN6P_CONTROLOPTS
340                     || last->in6p_socket->so_options & SO_TIMESTAMP)
341                         ip6_savecontrol(last, &opts, ip6, m);
342
343                 m_adj(m, off + sizeof(struct udphdr));
344                 if (sbappendaddr(&last->in6p_socket->so_rcv,
345                                 (struct sockaddr *)&udp_in6,
346                                 m, opts) == 0) {
347                         udpstat.udps_fullsock++;
348                         goto bad;
349                 }
350                 sorwakeup(last->in6p_socket);
351                 return IPPROTO_DONE;
352         }
353         /*
354          * Locate pcb for datagram.
355          */
356         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
357                                   &ip6->ip6_dst, uh->uh_dport, 1,
358                                   m->m_pkthdr.rcvif);
359         if (in6p == 0) {
360                 if (log_in_vain) {
361                         char buf[INET6_ADDRSTRLEN];
362
363                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
364                         log(LOG_INFO,
365                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
366                             buf, ntohs(uh->uh_dport),
367                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
368                 }
369                 udpstat.udps_noport++;
370                 if (m->m_flags & M_MCAST) {
371                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
372                         udpstat.udps_noportmcast++;
373                         goto bad;
374                 }
375                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
376                 return IPPROTO_DONE;
377         }
378 #ifdef IPSEC
379         /*
380          * Check AH/ESP integrity.
381          */
382         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
383                 ipsec6stat.in_polvio++;
384                 goto bad;
385         }
386 #endif /* IPSEC */
387 #ifdef FAST_IPSEC
388         /*
389          * Check AH/ESP integrity.
390          */
391         if (ipsec6_in_reject(m, in6p)) {
392                 goto bad;
393         }
394 #endif /* FAST_IPSEC */
395
396         /*
397          * Construct sockaddr format source address.
398          * Stuff source address and datagram in user buffer.
399          */
400         init_sin6(&udp_in6, m); /* general init */
401         udp_in6.sin6_port = uh->uh_sport;
402         if (in6p->in6p_flags & IN6P_CONTROLOPTS
403             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
404                 ip6_savecontrol(in6p, &opts, ip6, m);
405         m_adj(m, off + sizeof(struct udphdr));
406         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
407                         (struct sockaddr *)&udp_in6,
408                         m, opts) == 0) {
409                 udpstat.udps_fullsock++;
410                 goto bad;
411         }
412         sorwakeup(in6p->in6p_socket);
413         return IPPROTO_DONE;
414 bad:
415         if (m)
416                 m_freem(m);
417         if (opts)
418                 m_freem(opts);
419         return IPPROTO_DONE;
420 }
421
422 void
423 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
424 {
425         struct udphdr uh;
426         struct ip6_hdr *ip6;
427         struct mbuf *m;
428         int off = 0;
429         struct ip6ctlparam *ip6cp = NULL;
430         const struct sockaddr_in6 *sa6_src = NULL;
431         void (*notify) (struct inpcb *, int) = udp_notify;
432         struct udp_portonly {
433                 u_int16_t uh_sport;
434                 u_int16_t uh_dport;
435         } *uhp;
436
437         if (sa->sa_family != AF_INET6 ||
438             sa->sa_len != sizeof(struct sockaddr_in6))
439                 return;
440
441         if ((unsigned)cmd >= PRC_NCMDS)
442                 return;
443         if (PRC_IS_REDIRECT(cmd))
444                 notify = in6_rtchange, d = NULL;
445         else if (cmd == PRC_HOSTDEAD)
446                 d = NULL;
447         else if (inet6ctlerrmap[cmd] == 0)
448                 return;
449
450         /* if the parameter is from icmp6, decode it. */
451         if (d != NULL) {
452                 ip6cp = (struct ip6ctlparam *)d;
453                 m = ip6cp->ip6c_m;
454                 ip6 = ip6cp->ip6c_ip6;
455                 off = ip6cp->ip6c_off;
456                 sa6_src = ip6cp->ip6c_src;
457         } else {
458                 m = NULL;
459                 ip6 = NULL;
460                 sa6_src = &sa6_any;
461         }
462
463         if (ip6) {
464                 /*
465                  * XXX: We assume that when IPV6 is non NULL,
466                  * M and OFF are valid.
467                  */
468
469                 /* check if we can safely examine src and dst ports */
470                 if (m->m_pkthdr.len < off + sizeof(*uhp))
471                         return;
472
473                 bzero(&uh, sizeof(uh));
474                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
475
476                 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport,
477                               (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
478                               cmd, 0, notify);
479         } else
480                 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0,
481                               (const struct sockaddr *)sa6_src, 0,
482                               cmd, 0, notify);
483 }
484
485 static int
486 udp6_getcred(SYSCTL_HANDLER_ARGS)
487 {
488         struct sockaddr_in6 addrs[2];
489         struct inpcb *inp;
490         int error, s;
491
492         error = suser(req->td);
493         if (error)
494                 return (error);
495
496         if (req->newlen != sizeof(addrs))
497                 return (EINVAL);
498         if (req->oldlen != sizeof(struct ucred))
499                 return (EINVAL);
500         error = SYSCTL_IN(req, addrs, sizeof(addrs));
501         if (error)
502                 return (error);
503         s = splnet();
504         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
505                                  addrs[1].sin6_port,
506                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
507                                  1, NULL);
508         if (!inp || !inp->inp_socket) {
509                 error = ENOENT;
510                 goto out;
511         }
512         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
513                            sizeof(struct ucred));
514
515 out:
516         splx(s);
517         return (error);
518 }
519
520 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
521             0, 0,
522             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
523
524 static int
525 udp6_abort(struct socket *so)
526 {
527         struct inpcb *inp;
528         int s;
529
530         inp = so->so_pcb;
531         if (inp == 0)
532                 return EINVAL;  /* ??? possible? panic instead? */
533         soisdisconnected(so);
534         s = splnet();
535         in6_pcbdetach(inp);
536         splx(s);
537         return 0;
538 }
539
540 static int
541 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai)
542 {
543         struct inpcb *inp;
544         int s, error;
545
546         inp = so->so_pcb;
547         if (inp != 0)
548                 return EINVAL;
549
550         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
551                 error = soreserve(so, udp_sendspace, udp_recvspace,
552                     ai->sb_rlimit);
553                 if (error)
554                         return error;
555         }
556         s = splnet();
557         error = in_pcballoc(so, &udbinfo);
558         splx(s);
559         if (error)
560                 return error;
561         inp = (struct inpcb *)so->so_pcb;
562         inp->inp_vflag |= INP_IPV6;
563         if (!ip6_v6only)
564                 inp->inp_vflag |= INP_IPV4;
565         inp->in6p_hops = -1;    /* use kernel default */
566         inp->in6p_cksum = -1;   /* just to be sure */
567         /*
568          * XXX: ugly!!
569          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
570          * because the socket may be bound to an IPv6 wildcard address,
571          * which may match an IPv4-mapped IPv6 address.
572          */
573         inp->inp_ip_ttl = ip_defttl;
574         return 0;
575 }
576
577 static int
578 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
579 {
580         struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
581         struct inpcb *inp;
582         int s, error;
583
584         inp = so->so_pcb;
585         if (inp == 0)
586                 return EINVAL;
587
588         inp->inp_vflag &= ~INP_IPV4;
589         inp->inp_vflag |= INP_IPV6;
590         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
591                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
592                         inp->inp_vflag |= INP_IPV4;
593                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
594                         struct sockaddr_in sin;
595
596                         in6_sin6_2_sin(&sin, sin6_p);
597                         inp->inp_vflag |= INP_IPV4;
598                         inp->inp_vflag &= ~INP_IPV6;
599                         s = splnet();
600                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
601                         splx(s);
602                         return error;
603                 }
604         }
605
606         s = splnet();
607         error = in6_pcbbind(inp, nam, td);
608         splx(s);
609         if (error == 0) {
610                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
611                         inp->inp_flags |= INP_WASBOUND_NOTANY;
612                 in_pcbinswildcardhash(inp);
613         }
614         return error;
615 }
616
617 static int
618 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
619 {
620         struct inpcb *inp;
621         int s, error;
622
623         inp = so->so_pcb;
624         if (inp == 0)
625                 return EINVAL;
626
627         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
628                 struct sockaddr_in6 *sin6_p;
629
630                 sin6_p = (struct sockaddr_in6 *)nam;
631                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
632                         struct sockaddr_in sin;
633
634                         if (inp->inp_faddr.s_addr != INADDR_ANY)
635                                 return EISCONN;
636                         in6_sin6_2_sin(&sin, sin6_p);
637                         s = splnet();
638                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
639                         splx(s);
640                         if (error == 0) {
641                                 inp->inp_vflag |= INP_IPV4;
642                                 inp->inp_vflag &= ~INP_IPV6;
643                                 soisconnected(so);
644                         }
645                         return error;
646                 }
647         }
648         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
649                 return EISCONN;
650         if (inp->inp_flags & INP_WILDCARD)
651                 in_pcbremwildcardhash(inp);
652         s = splnet();
653         error = in6_pcbconnect(inp, nam, td);
654         splx(s);
655         if (error == 0) {
656                 if (!ip6_v6only) { /* should be non mapped addr */
657                         inp->inp_vflag &= ~INP_IPV4;
658                         inp->inp_vflag |= INP_IPV6;
659                 }
660                 soisconnected(so);
661         } else if (error == EAFNOSUPPORT) {     /* connection dissolved */
662                 /*
663                  * Follow traditional BSD behavior and retain
664                  * the local port binding.  But, fix the old misbehavior
665                  * of overwriting any previously bound local address.
666                  */
667                 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
668                         inp->in6p_laddr = in6addr_any;
669                 in_pcbinswildcardhash(inp);
670         }
671         return error;
672 }
673
674 static int
675 udp6_detach(struct socket *so)
676 {
677         struct inpcb *inp;
678         int s;
679
680         inp = so->so_pcb;
681         if (inp == 0)
682                 return EINVAL;
683         s = splnet();
684         in6_pcbdetach(inp);
685         splx(s);
686         return 0;
687 }
688
689 static int
690 udp6_disconnect(struct socket *so)
691 {
692         struct inpcb *inp;
693         int s;
694
695         inp = so->so_pcb;
696         if (inp == 0)
697                 return EINVAL;
698
699         if (inp->inp_vflag & INP_IPV4) {
700                 const struct pr_usrreqs *pru;
701
702                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
703                 return ((*pru->pru_disconnect)(so));
704         }
705
706         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
707                 return ENOTCONN;
708
709         s = splnet();
710         in6_pcbdisconnect(inp);
711         splx(s);
712         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
713         return 0;
714 }
715
716 static int
717 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
718           struct mbuf *control, struct thread *td)
719 {
720         struct inpcb *inp;
721         int error = 0;
722
723         inp = so->so_pcb;
724         if (inp == 0) {
725                 error = EINVAL;
726                 goto bad;
727         }
728
729         if (addr) {
730                 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 
731                         error = EINVAL;
732                         goto bad;
733                 }
734                 if (addr->sa_family != AF_INET6) {
735                         error = EAFNOSUPPORT;
736                         goto bad;
737                 }
738         }
739
740         if (!ip6_v6only) {
741                 int hasv4addr;
742                 struct sockaddr_in6 *sin6 = 0;
743
744                 if (addr == 0)
745                         hasv4addr = (inp->inp_vflag & INP_IPV4);
746                 else {
747                         sin6 = (struct sockaddr_in6 *)addr;
748                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
749                                 ? 1 : 0;
750                 }
751                 if (hasv4addr) {
752                         const struct pr_usrreqs *pru;
753
754                         if (sin6)
755                                 in6_sin6_2_sin_in_sock(addr);
756                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
757                         error = ((*pru->pru_send)(so, flags, m, addr,
758                                     control, td));
759                         /* addr will just be freed in sendit(). */
760                         return error;
761                 }
762         }
763
764         return udp6_output(inp, m, addr, control, td);
765
766   bad:
767         m_freem(m);
768         return(error);
769 }
770
771 struct pr_usrreqs udp6_usrreqs = {
772         udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
773         pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
774         pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
775         pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
776         in6_mapped_sockaddr, sosend, soreceive, sopoll
777 };