proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[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 1.4 2003/06/25 03:56:04 dillon 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 <netipsec/ipsec.h>
112 #include <netipsec/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 __P((struct inpcb *, struct in6_addr *, struct ifnet *));
122 static  int udp6_detach __P((struct socket *so));
123
124 static int
125 in6_mcmatch(in6p, ia6, ifp)
126         struct inpcb *in6p;
127         register struct in6_addr *ia6;
128         struct ifnet *ifp;
129 {
130         struct ip6_moptions *im6o = in6p->in6p_moptions;
131         struct in6_multi_mship *imm;
132
133         if (im6o == NULL)
134                 return 0;
135
136         for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
137              imm = imm->i6mm_chain.le_next) {
138                 if ((ifp == NULL ||
139                      imm->i6mm_maddr->in6m_ifp == ifp) &&
140                     IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
141                                        ia6))
142                         return 1;
143         }
144         return 0;
145 }
146
147 int
148 udp6_input(struct mbuf **mp, int *offp, int proto)
149 {
150         struct mbuf *m = *mp;
151         register struct ip6_hdr *ip6;
152         register struct udphdr *uh;
153         register struct inpcb *in6p;
154         struct  mbuf *opts = NULL;
155         int off = *offp;
156         int plen, ulen;
157         struct sockaddr_in6 udp_in6;
158
159         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
160
161         ip6 = mtod(m, struct ip6_hdr *);
162
163         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
164                 /* XXX send icmp6 host/port unreach? */
165                 m_freem(m);
166                 return IPPROTO_DONE;
167         }
168
169         udpstat.udps_ipackets++;
170
171         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
172         uh = (struct udphdr *)((caddr_t)ip6 + off);
173         ulen = ntohs((u_short)uh->uh_ulen);
174
175         if (plen != ulen) {
176                 udpstat.udps_badlen++;
177                 goto bad;
178         }
179
180         /*
181          * Checksum extended UDP header and data.
182          */
183         if (uh->uh_sum == 0)
184                 udpstat.udps_nosum++;
185         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
186                 udpstat.udps_badsum++;
187                 goto bad;
188         }
189
190         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
191                 struct  inpcb *last;
192
193                 /*
194                  * Deliver a multicast datagram to all sockets
195                  * for which the local and remote addresses and ports match
196                  * those of the incoming datagram.  This allows more than
197                  * one process to receive multicasts on the same port.
198                  * (This really ought to be done for unicast datagrams as
199                  * well, but that would cause problems with existing
200                  * applications that open both address-specific sockets and
201                  * a wildcard socket listening to the same port -- they would
202                  * end up receiving duplicates of every unicast datagram.
203                  * Those applications open the multiple sockets to overcome an
204                  * inadequacy of the UDP socket interface, but for backwards
205                  * compatibility we avoid the problem here rather than
206                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
207                  */
208
209                 /*
210                  * In a case that laddr should be set to the link-local
211                  * address (this happens in RIPng), the multicast address
212                  * specified in the received packet does not match with
213                  * laddr. To cure this situation, the matching is relaxed
214                  * if the receiving interface is the same as one specified
215                  * in the socket and if the destination multicast address
216                  * matches one of the multicast groups specified in the socket.
217                  */
218
219                 /*
220                  * Construct sockaddr format source address.
221                  */
222                 init_sin6(&udp_in6, m); /* general init */
223                 udp_in6.sin6_port = uh->uh_sport;
224                 /*
225                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
226                  * We need udphdr for IPsec processing so we do that later.
227                  */
228
229                 /*
230                  * Locate pcb(s) for datagram.
231                  * (Algorithm copied from raw_intr().)
232                  */
233                 last = NULL;
234                 LIST_FOREACH(in6p, &udb, inp_list) {
235                         if ((in6p->inp_vflag & INP_IPV6) == 0)
236                                 continue;
237                         if (in6p->in6p_lport != uh->uh_dport)
238                                 continue;
239                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
240                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
241                                                         &ip6->ip6_dst) &&
242                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
243                                                  m->m_pkthdr.rcvif))
244                                         continue;
245                         }
246                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
247                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
248                                                         &ip6->ip6_src) ||
249                                    in6p->in6p_fport != uh->uh_sport)
250                                         continue;
251                         }
252
253                         if (last != NULL) {
254                                 struct  mbuf *n;
255
256 #ifdef IPSEC
257                                 /*
258                                  * Check AH/ESP integrity.
259                                  */
260                                 if (ipsec6_in_reject_so(m, last->inp_socket))
261                                         ipsec6stat.in_polvio++;
262                                         /* do not inject data into pcb */
263                                 else
264 #endif /* IPSEC */
265 #ifdef FAST_IPSEC
266                                 /*
267                                  * Check AH/ESP integrity.
268                                  */
269                                 if (ipsec6_in_reject(m, last))
270                                         ;
271                                 else
272 #endif /* FAST_IPSEC */
273                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
274                                         /*
275                                          * KAME NOTE: do not
276                                          * m_copy(m, offset, ...) above.
277                                          * sbappendaddr() expects M_PKTHDR,
278                                          * and m_copy() will copy M_PKTHDR
279                                          * only if offset is 0.
280                                          */
281                                         if (last->in6p_flags & IN6P_CONTROLOPTS
282                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
283                                                 ip6_savecontrol(last, &opts,
284                                                                 ip6, n);
285                                                                 
286                                         m_adj(n, off + sizeof(struct udphdr));
287                                         if (sbappendaddr(&last->in6p_socket->so_rcv,
288                                                         (struct sockaddr *)&udp_in6,
289                                                         n, opts) == 0) {
290                                                 m_freem(n);
291                                                 if (opts)
292                                                         m_freem(opts);
293                                                 udpstat.udps_fullsock++;
294                                         } else
295                                                 sorwakeup(last->in6p_socket);
296                                         opts = NULL;
297                                 }
298                         }
299                         last = in6p;
300                         /*
301                          * Don't look for additional matches if this one does
302                          * not have either the SO_REUSEPORT or SO_REUSEADDR
303                          * socket options set.  This heuristic avoids searching
304                          * through all pcbs in the common case of a non-shared
305                          * port.  It assumes that an application will never
306                          * clear these options after setting them.
307                          */
308                         if ((last->in6p_socket->so_options &
309                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
310                                 break;
311                 }
312
313                 if (last == NULL) {
314                         /*
315                          * No matching pcb found; discard datagram.
316                          * (No need to send an ICMP Port Unreachable
317                          * for a broadcast or multicast datgram.)
318                          */
319                         udpstat.udps_noport++;
320                         udpstat.udps_noportmcast++;
321                         goto bad;
322                 }
323 #ifdef IPSEC
324                 /*
325                  * Check AH/ESP integrity.
326                  */
327                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
328                         ipsec6stat.in_polvio++;
329                         goto bad;
330                 }
331 #endif /* IPSEC */
332 #ifdef FAST_IPSEC
333                 /*
334                  * Check AH/ESP integrity.
335                  */
336                 if (ipsec6_in_reject(m, last)) {
337                         goto bad;
338                 }
339 #endif /* FAST_IPSEC */
340                 if (last->in6p_flags & IN6P_CONTROLOPTS
341                     || last->in6p_socket->so_options & SO_TIMESTAMP)
342                         ip6_savecontrol(last, &opts, ip6, m);
343
344                 m_adj(m, off + sizeof(struct udphdr));
345                 if (sbappendaddr(&last->in6p_socket->so_rcv,
346                                 (struct sockaddr *)&udp_in6,
347                                 m, opts) == 0) {
348                         udpstat.udps_fullsock++;
349                         goto bad;
350                 }
351                 sorwakeup(last->in6p_socket);
352                 return IPPROTO_DONE;
353         }
354         /*
355          * Locate pcb for datagram.
356          */
357         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
358                                   &ip6->ip6_dst, uh->uh_dport, 1,
359                                   m->m_pkthdr.rcvif);
360         if (in6p == 0) {
361                 if (log_in_vain) {
362                         char buf[INET6_ADDRSTRLEN];
363
364                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
365                         log(LOG_INFO,
366                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
367                             buf, ntohs(uh->uh_dport),
368                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
369                 }
370                 udpstat.udps_noport++;
371                 if (m->m_flags & M_MCAST) {
372                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
373                         udpstat.udps_noportmcast++;
374                         goto bad;
375                 }
376                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
377                 return IPPROTO_DONE;
378         }
379 #ifdef IPSEC
380         /*
381          * Check AH/ESP integrity.
382          */
383         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
384                 ipsec6stat.in_polvio++;
385                 goto bad;
386         }
387 #endif /* IPSEC */
388 #ifdef FAST_IPSEC
389         /*
390          * Check AH/ESP integrity.
391          */
392         if (ipsec6_in_reject(m, in6p)) {
393                 goto bad;
394         }
395 #endif /* FAST_IPSEC */
396
397         /*
398          * Construct sockaddr format source address.
399          * Stuff source address and datagram in user buffer.
400          */
401         init_sin6(&udp_in6, m); /* general init */
402         udp_in6.sin6_port = uh->uh_sport;
403         if (in6p->in6p_flags & IN6P_CONTROLOPTS
404             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
405                 ip6_savecontrol(in6p, &opts, ip6, m);
406         m_adj(m, off + sizeof(struct udphdr));
407         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
408                         (struct sockaddr *)&udp_in6,
409                         m, opts) == 0) {
410                 udpstat.udps_fullsock++;
411                 goto bad;
412         }
413         sorwakeup(in6p->in6p_socket);
414         return IPPROTO_DONE;
415 bad:
416         if (m)
417                 m_freem(m);
418         if (opts)
419                 m_freem(opts);
420         return IPPROTO_DONE;
421 }
422
423 void
424 udp6_ctlinput(cmd, sa, d)
425         int cmd;
426         struct sockaddr *sa;
427         void *d;
428 {
429         struct udphdr uh;
430         struct ip6_hdr *ip6;
431         struct mbuf *m;
432         int off = 0;
433         struct ip6ctlparam *ip6cp = NULL;
434         const struct sockaddr_in6 *sa6_src = NULL;
435         void (*notify) __P((struct inpcb *, int)) = udp_notify;
436         struct udp_portonly {
437                 u_int16_t uh_sport;
438                 u_int16_t uh_dport;
439         } *uhp;
440
441         if (sa->sa_family != AF_INET6 ||
442             sa->sa_len != sizeof(struct sockaddr_in6))
443                 return;
444
445         if ((unsigned)cmd >= PRC_NCMDS)
446                 return;
447         if (PRC_IS_REDIRECT(cmd))
448                 notify = in6_rtchange, d = NULL;
449         else if (cmd == PRC_HOSTDEAD)
450                 d = NULL;
451         else if (inet6ctlerrmap[cmd] == 0)
452                 return;
453
454         /* if the parameter is from icmp6, decode it. */
455         if (d != NULL) {
456                 ip6cp = (struct ip6ctlparam *)d;
457                 m = ip6cp->ip6c_m;
458                 ip6 = ip6cp->ip6c_ip6;
459                 off = ip6cp->ip6c_off;
460                 sa6_src = ip6cp->ip6c_src;
461         } else {
462                 m = NULL;
463                 ip6 = NULL;
464                 sa6_src = &sa6_any;
465         }
466
467         if (ip6) {
468                 /*
469                  * XXX: We assume that when IPV6 is non NULL,
470                  * M and OFF are valid.
471                  */
472
473                 /* check if we can safely examine src and dst ports */
474                 if (m->m_pkthdr.len < off + sizeof(*uhp))
475                         return;
476
477                 bzero(&uh, sizeof(uh));
478                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
479
480                 (void) in6_pcbnotify(&udb, sa, uh.uh_dport,
481                                      (struct sockaddr *)ip6cp->ip6c_src, 
482                                      uh.uh_sport, cmd, notify);
483         } else
484                 (void) in6_pcbnotify(&udb, sa, 0, (struct sockaddr *)sa6_src,
485                                      0, cmd, notify);
486 }
487
488 static int
489 udp6_getcred(SYSCTL_HANDLER_ARGS)
490 {
491         struct sockaddr_in6 addrs[2];
492         struct inpcb *inp;
493         int error, s;
494
495         error = suser(req->td);
496         if (error)
497                 return (error);
498
499         if (req->newlen != sizeof(addrs))
500                 return (EINVAL);
501         if (req->oldlen != sizeof(struct ucred))
502                 return (EINVAL);
503         error = SYSCTL_IN(req, addrs, sizeof(addrs));
504         if (error)
505                 return (error);
506         s = splnet();
507         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
508                                  addrs[1].sin6_port,
509                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
510                                  1, NULL);
511         if (!inp || !inp->inp_socket) {
512                 error = ENOENT;
513                 goto out;
514         }
515         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
516                            sizeof(struct ucred));
517
518 out:
519         splx(s);
520         return (error);
521 }
522
523 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
524             0, 0,
525             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
526
527 static int
528 udp6_abort(struct socket *so)
529 {
530         struct inpcb *inp;
531         int s;
532
533         inp = sotoinpcb(so);
534         if (inp == 0)
535                 return EINVAL;  /* ??? possible? panic instead? */
536         soisdisconnected(so);
537         s = splnet();
538         in6_pcbdetach(inp);
539         splx(s);
540         return 0;
541 }
542
543 static int
544 udp6_attach(struct socket *so, int proto, struct thread *td)
545 {
546         struct inpcb *inp;
547         int s, error;
548
549         inp = sotoinpcb(so);
550         if (inp != 0)
551                 return EINVAL;
552
553         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
554                 error = soreserve(so, udp_sendspace, udp_recvspace);
555                 if (error)
556                         return error;
557         }
558         s = splnet();
559         error = in_pcballoc(so, &udbinfo, td);
560         splx(s);
561         if (error)
562                 return error;
563         inp = (struct inpcb *)so->so_pcb;
564         inp->inp_vflag |= INP_IPV6;
565         if (!ip6_v6only)
566                 inp->inp_vflag |= INP_IPV4;
567         inp->in6p_hops = -1;    /* use kernel default */
568         inp->in6p_cksum = -1;   /* just to be sure */
569         /*
570          * XXX: ugly!!
571          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
572          * because the socket may be bound to an IPv6 wildcard address,
573          * which may match an IPv4-mapped IPv6 address.
574          */
575         inp->inp_ip_ttl = ip_defttl;
576         return 0;
577 }
578
579 static int
580 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
581 {
582         struct inpcb *inp;
583         int s, error;
584
585         inp = sotoinpcb(so);
586         if (inp == 0)
587                 return EINVAL;
588
589         inp->inp_vflag &= ~INP_IPV4;
590         inp->inp_vflag |= INP_IPV6;
591         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
592                 struct sockaddr_in6 *sin6_p;
593
594                 sin6_p = (struct sockaddr_in6 *)nam;
595
596                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
597                         inp->inp_vflag |= INP_IPV4;
598                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
599                         struct sockaddr_in sin;
600
601                         in6_sin6_2_sin(&sin, sin6_p);
602                         inp->inp_vflag |= INP_IPV4;
603                         inp->inp_vflag &= ~INP_IPV6;
604                         s = splnet();
605                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
606                         splx(s);
607                         return error;
608                 }
609         }
610
611         s = splnet();
612         error = in6_pcbbind(inp, nam, td);
613         splx(s);
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 = sotoinpcb(so);
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         s = splnet();
651         error = in6_pcbconnect(inp, nam, td);
652         splx(s);
653         if (error == 0) {
654                 if (!ip6_v6only) { /* should be non mapped addr */
655                         inp->inp_vflag &= ~INP_IPV4;
656                         inp->inp_vflag |= INP_IPV6;
657                 }
658                 soisconnected(so);
659         }
660         return error;
661 }
662
663 static int
664 udp6_detach(struct socket *so)
665 {
666         struct inpcb *inp;
667         int s;
668
669         inp = sotoinpcb(so);
670         if (inp == 0)
671                 return EINVAL;
672         s = splnet();
673         in6_pcbdetach(inp);
674         splx(s);
675         return 0;
676 }
677
678 static int
679 udp6_disconnect(struct socket *so)
680 {
681         struct inpcb *inp;
682         int s;
683
684         inp = sotoinpcb(so);
685         if (inp == 0)
686                 return EINVAL;
687
688         if (inp->inp_vflag & INP_IPV4) {
689                 struct pr_usrreqs *pru;
690
691                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
692                 return ((*pru->pru_disconnect)(so));
693         }
694
695         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
696                 return ENOTCONN;
697
698         s = splnet();
699         in6_pcbdisconnect(inp);
700         inp->in6p_laddr = in6addr_any;
701         splx(s);
702         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
703         return 0;
704 }
705
706 static int
707 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
708           struct mbuf *control, struct thread *td)
709 {
710         struct inpcb *inp;
711         int error = 0;
712
713         inp = sotoinpcb(so);
714         if (inp == 0) {
715                 error = EINVAL;
716                 goto bad;
717         }
718
719         if (addr) {
720                 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 
721                         error = EINVAL;
722                         goto bad;
723                 }
724                 if (addr->sa_family != AF_INET6) {
725                         error = EAFNOSUPPORT;
726                         goto bad;
727                 }
728         }
729
730         if (!ip6_v6only) {
731                 int hasv4addr;
732                 struct sockaddr_in6 *sin6 = 0;
733
734                 if (addr == 0)
735                         hasv4addr = (inp->inp_vflag & INP_IPV4);
736                 else {
737                         sin6 = (struct sockaddr_in6 *)addr;
738                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
739                                 ? 1 : 0;
740                 }
741                 if (hasv4addr) {
742                         struct pr_usrreqs *pru;
743
744                         if (sin6)
745                                 in6_sin6_2_sin_in_sock(addr);
746                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
747                         error = ((*pru->pru_send)(so, flags, m, addr, control,
748                                                   p));
749                         /* addr will just be freed in sendit(). */
750                         return error;
751                 }
752         }
753
754         return udp6_output(inp, m, addr, control, td);
755
756   bad:
757         m_freem(m);
758         return(error);
759 }
760
761 struct pr_usrreqs udp6_usrreqs = {
762         udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
763         pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
764         pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
765         pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
766         in6_mapped_sockaddr, sosend, soreceive, sopoll
767 };