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 /*      $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. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
  62  */
  63
  64 #include "opt_inet.h"
  65 #include "opt_inet6.h"
  66 #include "opt_ipsec.h"
  67
  68 #include <sys/param.h>
  69 #include <sys/kernel.h>
  70 #include <sys/mbuf.h>
  71 #include <sys/protosw.h>
  72 #include <sys/socket.h>
  73 #include <sys/socketvar.h>
  74 #include <sys/sysctl.h>
  75 #include <sys/errno.h>
  76 #include <sys/stat.h>
  77 #include <sys/systm.h>
  78 #include <sys/syslog.h>
  79 #include <sys/proc.h>
  80 #include <sys/priv.h>
  81
  82 #include <sys/thread2.h>
  83 #include <sys/socketvar2.h>
  84 #include <sys/msgport2.h>
  85
  86 #include <net/if.h>
  87 #include <net/route.h>
  88 #include <net/if_types.h>
  89 #include <net/netisr2.h>
  90
  91 #include <netinet/in.h>
  92 #include <netinet/in_systm.h>
  93 #include <netinet/ip.h>
  94 #include <netinet/in_pcb.h>
  95 #include <netinet/in_var.h>
  96 #include <netinet/ip_var.h>
  97 #include <netinet/udp.h>
  98 #include <netinet/udp_var.h>
  99 #include <netinet/ip6.h>
 100 #include <netinet6/ip6_var.h>
 101 #include <netinet6/in6_pcb.h>
 102 #include <netinet/icmp6.h>
 103 #include <netinet6/udp6_var.h>
 104 #include <netinet6/ip6protosw.h>
 105
 106 #ifdef IPSEC
 107 #include <netinet6/ipsec.h>
 108 #include <netinet6/ipsec6.h>
 109 #endif /* IPSEC */
 110
 111 #ifdef FAST_IPSEC
 112 #include <netproto/ipsec/ipsec.h>
 113 #include <netproto/ipsec/ipsec6.h>
 114 #endif /* FAST_IPSEC */
 115
 116 /*
 117  * UDP protocol inplementation.
 118  * Per RFC 768, August, 1980.
 119  */
 120
 121 extern  struct protosw inetsw[];
 122 static  int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
 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         struct socket *so;
 156         struct inpcbinfo *pcbinfo = &udbinfo[0];
 157
 158         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 159
 160         ip6 = mtod(m, struct ip6_hdr *);
 161
 162         udp_stat.udps_ipackets++;
 163
 164         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 165         uh = (struct udphdr *)((caddr_t)ip6 + off);
 166         ulen = ntohs((u_short)uh->uh_ulen);
 167
 168         if (plen != ulen) {
 169                 udp_stat.udps_badlen++;
 170                 goto bad;
 171         }
 172
 173         /*
 174          * Checksum extended UDP header and data.
 175          */
 176         if (uh->uh_sum == 0)
 177                 udp_stat.udps_nosum++;
 178         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 179                 udp_stat.udps_badsum++;
 180                 goto bad;
 181         }
 182
 183         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 184                 struct  inpcb *last, *marker;
 185
 186                 /*
 187                  * Deliver a multicast datagram to all sockets
 188                  * for which the local and remote addresses and ports match
 189                  * those of the incoming datagram.  This allows more than
 190                  * one process to receive multicasts on the same port.
 191                  * (This really ought to be done for unicast datagrams as
 192                  * well, but that would cause problems with existing
 193                  * applications that open both address-specific sockets and
 194                  * a wildcard socket listening to the same port -- they would
 195                  * end up receiving duplicates of every unicast datagram.
 196                  * Those applications open the multiple sockets to overcome an
 197                  * inadequacy of the UDP socket interface, but for backwards
 198                  * compatibility we avoid the problem here rather than
 199                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 200                  */
 201
 202                 /*
 203                  * In a case that laddr should be set to the link-local
 204                  * address (this happens in RIPng), the multicast address
 205                  * specified in the received packet does not match with
 206                  * laddr. To cure this situation, the matching is relaxed
 207                  * if the receiving interface is the same as one specified
 208                  * in the socket and if the destination multicast address
 209                  * matches one of the multicast groups specified in the socket.
 210                  */
 211
 212                 /*
 213                  * Construct sockaddr format source address.
 214                  */
 215                 init_sin6(&udp_in6, m); /* general init */
 216                 udp_in6.sin6_port = uh->uh_sport;
 217                 /*
 218                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
 219                  * We need udphdr for IPsec processing so we do that later.
 220                  */
 221
 222                 /*
 223                  * Locate pcb(s) for datagram.
 224                  * (Algorithm copied from raw_intr().)
 225                  */
 226                 last = NULL;
 227
 228                 marker = in_pcbmarker();
 229
 230                 GET_PCBINFO_TOKEN(pcbinfo);
 231
 232                 LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
 233                 while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) {
 234                         LIST_REMOVE(marker, inp_list);
 235                         LIST_INSERT_AFTER(in6p, marker, inp_list);
 236
 237                         if (in6p->inp_flags & INP_PLACEMARKER)
 238                                 continue;
 239                         if (!INP_ISIPV6(in6p))
 240                                 continue;
 241                         if (in6p->in6p_lport != uh->uh_dport)
 242                                 continue;
 243                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 244                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 245                                                         &ip6->ip6_dst) &&
 246                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
 247                                                  m->m_pkthdr.rcvif))
 248                                         continue;
 249                         }
 250                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 251                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 252                                                         &ip6->ip6_src) ||
 253                                    in6p->in6p_fport != uh->uh_sport)
 254                                         continue;
 255                         }
 256
 257                         if (last != NULL) {
 258                                 struct mbuf *n;
 259
 260 #ifdef IPSEC
 261                                 /*
 262                                  * Check AH/ESP integrity.
 263                                  */
 264                                 if (ipsec6_in_reject_so(m, last->inp_socket))
 265                                         ipsec6stat.in_polvio++;
 266                                         /* do not inject data into pcb */
 267                                 else
 268 #endif /* IPSEC */
 269 #ifdef FAST_IPSEC
 270                                 /*
 271                                  * Check AH/ESP integrity.
 272                                  */
 273                                 if (ipsec6_in_reject(m, last))
 274                                         ;
 275                                 else
 276 #endif /* FAST_IPSEC */
 277                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 278                                         /*
 279                                          * KAME NOTE: do not
 280                                          * m_copy(m, offset, ...) above.
 281                                          * ssb_appendaddr() expects M_PKTHDR,
 282                                          * and m_copy() will copy M_PKTHDR
 283                                          * only if offset is 0.
 284                                          */
 285                                         so = last->in6p_socket;
 286                                         if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
 287                                             (so->so_options & SO_TIMESTAMP)) {
 288                                                 ip6_savecontrol(last, &opts,
 289                                                                 ip6, n);
 290                                         }
 291                                         m_adj(n, off + sizeof(struct udphdr));
 292                                         lwkt_gettoken(&so->so_rcv.ssb_token);
 293                                         if (ssb_appendaddr(&so->so_rcv,
 294                                                     (struct sockaddr *)&udp_in6,
 295                                                     n, opts) == 0) {
 296                                                 m_freem(n);
 297                                                 if (opts)
 298                                                         m_freem(opts);
 299                                                 udp_stat.udps_fullsock++;
 300                                         } else {
 301                                                 sorwakeup(so);
 302                                         }
 303                                         lwkt_reltoken(&so->so_rcv.ssb_token);
 304                                         opts = NULL;
 305                                 }
 306                         }
 307                         last = in6p;
 308                         /*
 309                          * Don't look for additional matches if this one does
 310                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 311                          * socket options set.  This heuristic avoids searching
 312                          * through all pcbs in the common case of a non-shared
 313                          * port.  It assumes that an application will never
 314                          * clear these options after setting them.
 315                          */
 316                         if ((last->in6p_socket->so_options &
 317                              (SO_REUSEPORT | SO_REUSEADDR)) == 0)
 318                                 break;
 319                 }
 320                 LIST_REMOVE(marker, inp_list);
 321
 322                 REL_PCBINFO_TOKEN(pcbinfo);
 323
 324                 if (last == NULL) {
 325                         /*
 326                          * No matching pcb found; discard datagram.
 327                          * (No need to send an ICMP Port Unreachable
 328                          * for a broadcast or multicast datgram.)
 329                          */
 330                         udp_stat.udps_noport++;
 331                         udp_stat.udps_noportmcast++;
 332                         goto bad;
 333                 }
 334 #ifdef IPSEC
 335                 /*
 336                  * Check AH/ESP integrity.
 337                  */
 338                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
 339                         ipsec6stat.in_polvio++;
 340                         goto bad;
 341                 }
 342 #endif /* IPSEC */
 343 #ifdef FAST_IPSEC
 344                 /*
 345                  * Check AH/ESP integrity.
 346                  */
 347                 if (ipsec6_in_reject(m, last)) {
 348                         goto bad;
 349                 }
 350 #endif /* FAST_IPSEC */
 351                 if (last->in6p_flags & IN6P_CONTROLOPTS
 352                     || last->in6p_socket->so_options & SO_TIMESTAMP)
 353                         ip6_savecontrol(last, &opts, ip6, m);
 354
 355                 m_adj(m, off + sizeof(struct udphdr));
 356                 so = last->in6p_socket;
 357                 lwkt_gettoken(&so->so_rcv.ssb_token);
 358                 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
 359                                    m, opts) == 0) {
 360                         udp_stat.udps_fullsock++;
 361                         lwkt_reltoken(&so->so_rcv.ssb_token);
 362                         goto bad;
 363                 }
 364                 sorwakeup(so);
 365                 lwkt_reltoken(&so->so_rcv.ssb_token);
 366                 return IPPROTO_DONE;
 367         }
 368         /*
 369          * Locate pcb for datagram.
 370          */
 371         in6p = in6_pcblookup_hash(pcbinfo, &ip6->ip6_src, uh->uh_sport,
 372                                   &ip6->ip6_dst, uh->uh_dport, 1,
 373                                   m->m_pkthdr.rcvif);
 374         if (in6p == NULL) {
 375                 if (log_in_vain) {
 376                         char buf[INET6_ADDRSTRLEN];
 377
 378                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
 379                         log(LOG_INFO,
 380                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 381                             buf, ntohs(uh->uh_dport),
 382                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 383                 }
 384                 udp_stat.udps_noport++;
 385                 if (m->m_flags & M_MCAST) {
 386                         kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
 387                         udp_stat.udps_noportmcast++;
 388                         goto bad;
 389                 }
 390                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 391                 return IPPROTO_DONE;
 392         }
 393 #ifdef IPSEC
 394         /*
 395          * Check AH/ESP integrity.
 396          */
 397         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 398                 ipsec6stat.in_polvio++;
 399                 goto bad;
 400         }
 401 #endif /* IPSEC */
 402 #ifdef FAST_IPSEC
 403         /*
 404          * Check AH/ESP integrity.
 405          */
 406         if (ipsec6_in_reject(m, in6p)) {
 407                 goto bad;
 408         }
 409 #endif /* FAST_IPSEC */
 410
 411         /*
 412          * Construct sockaddr format source address.
 413          * Stuff source address and datagram in user buffer.
 414          */
 415         init_sin6(&udp_in6, m); /* general init */
 416         udp_in6.sin6_port = uh->uh_sport;
 417         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 418             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 419                 ip6_savecontrol(in6p, &opts, ip6, m);
 420         m_adj(m, off + sizeof(struct udphdr));
 421         so = in6p->in6p_socket;
 422         lwkt_gettoken(&so->so_rcv.ssb_token);
 423         if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
 424                            m, opts) == 0) {
 425                 udp_stat.udps_fullsock++;
 426                 lwkt_reltoken(&so->so_rcv.ssb_token);
 427                 goto bad;
 428         }
 429         sorwakeup(so);
 430         lwkt_reltoken(&so->so_rcv.ssb_token);
 431         return IPPROTO_DONE;
 432 bad:
 433         if (m)
 434                 m_freem(m);
 435         if (opts)
 436                 m_freem(opts);
 437         return IPPROTO_DONE;
 438 }
 439
 440 void
 441 udp6_ctlinput(netmsg_t msg)
 442 {
 443         int cmd = msg->ctlinput.nm_cmd;
 444         struct sockaddr *sa = msg->ctlinput.nm_arg;
 445         void *d = msg->ctlinput.nm_extra;
 446         struct udphdr uh;
 447         struct ip6_hdr *ip6;
 448         struct mbuf *m;
 449         int off = 0;
 450         struct ip6ctlparam *ip6cp = NULL;
 451         const struct sockaddr_in6 *sa6_src = NULL;
 452         inp_notify_t notify = udp_notify;
 453         struct udp_portonly {
 454                 u_int16_t uh_sport;
 455                 u_int16_t uh_dport;
 456         } *uhp;
 457
 458         if (sa->sa_family != AF_INET6 ||
 459             sa->sa_len != sizeof(struct sockaddr_in6))
 460                 goto out;
 461
 462         if ((unsigned)cmd >= PRC_NCMDS)
 463                 goto out;
 464         if (PRC_IS_REDIRECT(cmd))
 465                 notify = in6_rtchange, d = NULL;
 466         else if (cmd == PRC_HOSTDEAD)
 467                 d = NULL;
 468         else if (inet6ctlerrmap[cmd] == 0)
 469                 goto out;
 470
 471         /* if the parameter is from icmp6, decode it. */
 472         if (d != NULL) {
 473                 ip6cp = (struct ip6ctlparam *)d;
 474                 m = ip6cp->ip6c_m;
 475                 ip6 = ip6cp->ip6c_ip6;
 476                 off = ip6cp->ip6c_off;
 477                 sa6_src = ip6cp->ip6c_src;
 478         } else {
 479                 m = NULL;
 480                 ip6 = NULL;
 481                 sa6_src = &sa6_any;
 482         }
 483
 484         if (ip6) {
 485                 /*
 486                  * XXX: We assume that when IPV6 is non NULL,
 487                  * M and OFF are valid.
 488                  */
 489
 490                 /* check if we can safely examine src and dst ports */
 491                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 492                         return;
 493
 494                 bzero(&uh, sizeof(uh));
 495                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 496
 497                 in6_pcbnotify(&udbinfo[0], sa, uh.uh_dport,
 498                               (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
 499                               cmd, 0, notify);
 500         } else {
 501                 in6_pcbnotify(&udbinfo[0], sa, 0,
 502                               (const struct sockaddr *)sa6_src, 0,
 503                               cmd, 0, notify);
 504         }
 505 out:
 506         lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
 507 }
 508
 509 static int
 510 udp6_getcred(SYSCTL_HANDLER_ARGS)
 511 {
 512         struct sockaddr_in6 addrs[2];
 513         struct inpcb *inp;
 514         int error;
 515
 516         error = priv_check(req->td, PRIV_ROOT);
 517         if (error)
 518                 return (error);
 519
 520         if (req->newlen != sizeof(addrs))
 521                 return (EINVAL);
 522         if (req->oldlen != sizeof(struct ucred))
 523                 return (EINVAL);
 524         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 525         if (error)
 526                 return (error);
 527         crit_enter();
 528         inp = in6_pcblookup_hash(&udbinfo[0], &addrs[1].sin6_addr,
 529                                  addrs[1].sin6_port,
 530                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 531                                  1, NULL);
 532         if (!inp || !inp->inp_socket) {
 533                 error = ENOENT;
 534                 goto out;
 535         }
 536         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
 537                            sizeof(struct ucred));
 538
 539 out:
 540         crit_exit();
 541         return (error);
 542 }
 543
 544 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 545             0, 0,
 546             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 547
 548 /*
 549  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
 550  *       will sofree() it when we return.
 551  */
 552 static void
 553 udp6_abort(netmsg_t msg)
 554 {
 555         struct socket *so = msg->abort.base.nm_so;
 556         struct inpcb *inp;
 557         int error;
 558
 559         inp = so->so_pcb;
 560         if (inp) {
 561                 soisdisconnected(so);
 562
 563                 in6_pcbdetach(inp);
 564                 error = 0;
 565         } else {
 566                 error = EINVAL;
 567         }
 568         lwkt_replymsg(&msg->abort.base.lmsg, error);
 569 }
 570
 571 static void
 572 udp6_attach(netmsg_t msg)
 573 {
 574         struct socket *so = msg->attach.base.nm_so;
 575         struct pru_attach_info *ai = msg->attach.nm_ai;
 576         struct inpcb *inp;
 577         int error;
 578
 579         inp = so->so_pcb;
 580         if (inp != NULL) {
 581                 error = EINVAL;
 582                 goto out;
 583         }
 584
 585         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
 586                 error = soreserve(so, udp_sendspace, udp_recvspace,
 587                     ai->sb_rlimit);
 588                 if (error)
 589                         goto out;
 590         }
 591
 592         error = in_pcballoc(so, &udbinfo[0]);
 593         if (error)
 594                 goto out;
 595
 596         inp = (struct inpcb *)so->so_pcb;
 597         inp->in6p_hops = -1;    /* use kernel default */
 598         inp->in6p_cksum = -1;   /* just to be sure */
 599         /*
 600          * XXX: ugly!!
 601          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 602          * because the socket may be bound to an IPv6 wildcard address,
 603          * which may match an IPv4-mapped IPv6 address.
 604          */
 605         inp->inp_ip_ttl = ip_defttl;
 606         error = 0;
 607 out:
 608         lwkt_replymsg(&msg->attach.base.lmsg, error);
 609 }
 610
 611 static void
 612 udp6_bind(netmsg_t msg)
 613 {
 614         struct socket *so =msg->bind.base.nm_so;
 615         struct sockaddr *nam = msg->bind.nm_nam;
 616         struct thread *td = msg->bind.nm_td;
 617         struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
 618         struct inpcb *inp;
 619         int error;
 620
 621         inp = so->so_pcb;
 622         if (inp == NULL) {
 623                 error = EINVAL;
 624                 goto out;
 625         }
 626
 627         error = in6_pcbbind(inp, nam, td);
 628         if (error == 0) {
 629                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 630                         inp->inp_flags |= INP_WASBOUND_NOTANY;
 631                 in_pcbinswildcardhash(inp);
 632         }
 633 out:
 634         lwkt_replymsg(&msg->bind.base.lmsg, error);
 635 }
 636
 637 static void
 638 udp6_connect(netmsg_t msg)
 639 {
 640         struct socket *so = msg->connect.base.nm_so;
 641         struct sockaddr *nam = msg->connect.nm_nam;
 642         struct thread *td = msg->connect.nm_td;
 643         struct sockaddr_in6 *sin6_p;
 644         struct inpcb *inp;
 645         int error;
 646
 647         inp = so->so_pcb;
 648         if (inp == NULL) {
 649                 error = EINVAL;
 650                 goto out;
 651         }
 652
 653         sin6_p = (struct sockaddr_in6 *)nam;
 654         if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 655                 error = EADDRNOTAVAIL;
 656                 goto out;
 657         }
 658
 659         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 660                 error = EISCONN;
 661                 goto out;
 662         }
 663         if (inp->inp_flags & INP_WILDCARD)
 664                 in_pcbremwildcardhash(inp);
 665         if (!prison_remote_ip(td, nam)) {
 666                 error = EAFNOSUPPORT; /* IPv4 only jail */
 667                 goto out;
 668         }
 669         error = in6_pcbconnect(inp, nam, td);
 670         if (error == 0) {
 671                 soisconnected(so);
 672         } else if (error == EAFNOSUPPORT) {     /* connection dissolved */
 673                 /*
 674                  * Follow traditional BSD behavior and retain
 675                  * the local port binding.  But, fix the old misbehavior
 676                  * of overwriting any previously bound local address.
 677                  */
 678                 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
 679                         inp->in6p_laddr = kin6addr_any;
 680                 in_pcbinswildcardhash(inp);
 681         }
 682 out:
 683         lwkt_replymsg(&msg->connect.base.lmsg, error);
 684 }
 685
 686 static void
 687 udp6_detach(netmsg_t msg)
 688 {
 689         struct socket *so = msg->detach.base.nm_so;
 690         struct inpcb *inp;
 691         int error;
 692
 693         inp = so->so_pcb;
 694         if (inp) {
 695                 in6_pcbdetach(inp);
 696                 error = 0;
 697         } else {
 698                 error = EINVAL;
 699         }
 700         lwkt_replymsg(&msg->detach.base.lmsg, error);
 701 }
 702
 703 static void
 704 udp6_disconnect(netmsg_t msg)
 705 {
 706         struct socket *so = msg->disconnect.base.nm_so;
 707         struct inpcb *inp;
 708         int error;
 709
 710         inp = so->so_pcb;
 711         if (inp == NULL) {
 712                 error = EINVAL;
 713                 goto out;
 714         }
 715
 716         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 717                 error = ENOTCONN;
 718         } else {
 719                 in6_pcbdisconnect(inp);
 720                 soclrstate(so, SS_ISCONNECTED);         /* XXX */
 721                 error = 0;
 722         }
 723 out:
 724         lwkt_replymsg(&msg->disconnect.base.lmsg, error);
 725 }
 726
 727 static void
 728 udp6_send(netmsg_t msg)
 729 {
 730         struct socket *so = msg->send.base.nm_so;
 731         struct mbuf *m = msg->send.nm_m;
 732         struct sockaddr *addr = msg->send.nm_addr;
 733         struct mbuf *control = msg->send.nm_control;
 734         struct thread *td = msg->send.nm_td;
 735         struct inpcb *inp;
 736         int error = 0;
 737
 738         inp = so->so_pcb;
 739         if (inp == NULL) {
 740                 error = EINVAL;
 741                 goto bad;
 742         }
 743
 744         if (addr) {
 745                 struct sockaddr_in6 *sin6;
 746
 747                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 748                         error = EINVAL;
 749                         goto bad;
 750                 }
 751                 if (addr->sa_family != AF_INET6) {
 752                         error = EAFNOSUPPORT;
 753                         goto bad;
 754                 }
 755
 756                 sin6 = (struct sockaddr_in6 *)addr;
 757                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 758                         error = EADDRNOTAVAIL;
 759                         goto bad;
 760                 }
 761         }
 762
 763         error = udp6_output(inp, m, addr, control, td);
 764         lwkt_replymsg(&msg->send.base.lmsg, error);
 765         return;
 766 bad:
 767         m_freem(m);
 768         lwkt_replymsg(&msg->send.base.lmsg, error);
 769 }
 770
 771 struct pr_usrreqs udp6_usrreqs = {
 772         .pru_abort = udp6_abort,
 773         .pru_accept = pr_generic_notsupp,
 774         .pru_attach = udp6_attach,
 775         .pru_bind = udp6_bind,
 776         .pru_connect = udp6_connect,
 777         .pru_connect2 = pr_generic_notsupp,
 778         .pru_control = in6_control_dispatch,
 779         .pru_detach = udp6_detach,
 780         .pru_disconnect = udp6_disconnect,
 781         .pru_listen = pr_generic_notsupp,
 782         .pru_peeraddr = in6_setpeeraddr_dispatch,
 783         .pru_rcvd = pr_generic_notsupp,
 784         .pru_rcvoob = pr_generic_notsupp,
 785         .pru_send = udp6_send,
 786         .pru_sense = pru_sense_null,
 787         .pru_shutdown = udp_shutdown,
 788         .pru_sockaddr = in6_setsockaddr_dispatch,
 789         .pru_sosend = sosend,
 790         .pru_soreceive = soreceive
 791 };
 792