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         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
 163                 /* XXX send icmp6 host/port unreach? */
 164                 m_freem(m);
 165                 return IPPROTO_DONE;
 166         }
 167
 168         udp_stat.udps_ipackets++;
 169
 170         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 171         uh = (struct udphdr *)((caddr_t)ip6 + off);
 172         ulen = ntohs((u_short)uh->uh_ulen);
 173
 174         if (plen != ulen) {
 175                 udp_stat.udps_badlen++;
 176                 goto bad;
 177         }
 178
 179         /*
 180          * Checksum extended UDP header and data.
 181          */
 182         if (uh->uh_sum == 0)
 183                 udp_stat.udps_nosum++;
 184         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 185                 udp_stat.udps_badsum++;
 186                 goto bad;
 187         }
 188
 189         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 190                 struct  inpcb *last, *marker;
 191
 192                 /*
 193                  * Deliver a multicast datagram to all sockets
 194                  * for which the local and remote addresses and ports match
 195                  * those of the incoming datagram.  This allows more than
 196                  * one process to receive multicasts on the same port.
 197                  * (This really ought to be done for unicast datagrams as
 198                  * well, but that would cause problems with existing
 199                  * applications that open both address-specific sockets and
 200                  * a wildcard socket listening to the same port -- they would
 201                  * end up receiving duplicates of every unicast datagram.
 202                  * Those applications open the multiple sockets to overcome an
 203                  * inadequacy of the UDP socket interface, but for backwards
 204                  * compatibility we avoid the problem here rather than
 205                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 206                  */
 207
 208                 /*
 209                  * In a case that laddr should be set to the link-local
 210                  * address (this happens in RIPng), the multicast address
 211                  * specified in the received packet does not match with
 212                  * laddr. To cure this situation, the matching is relaxed
 213                  * if the receiving interface is the same as one specified
 214                  * in the socket and if the destination multicast address
 215                  * matches one of the multicast groups specified in the socket.
 216                  */
 217
 218                 /*
 219                  * Construct sockaddr format source address.
 220                  */
 221                 init_sin6(&udp_in6, m); /* general init */
 222                 udp_in6.sin6_port = uh->uh_sport;
 223                 /*
 224                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
 225                  * We need udphdr for IPsec processing so we do that later.
 226                  */
 227
 228                 /*
 229                  * Locate pcb(s) for datagram.
 230                  * (Algorithm copied from raw_intr().)
 231                  */
 232                 last = NULL;
 233
 234                 marker = in_pcbmarker(mycpuid);
 235
 236                 GET_PCBINFO_TOKEN(pcbinfo);
 237
 238                 LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
 239                 while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) {
 240                         LIST_REMOVE(marker, inp_list);
 241                         LIST_INSERT_AFTER(in6p, marker, inp_list);
 242
 243                         if (in6p->inp_flags & INP_PLACEMARKER)
 244                                 continue;
 245                         if (!(in6p->inp_vflag & INP_IPV6))
 246                                 continue;
 247                         if (in6p->in6p_lport != uh->uh_dport)
 248                                 continue;
 249                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 250                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 251                                                         &ip6->ip6_dst) &&
 252                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
 253                                                  m->m_pkthdr.rcvif))
 254                                         continue;
 255                         }
 256                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 257                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 258                                                         &ip6->ip6_src) ||
 259                                    in6p->in6p_fport != uh->uh_sport)
 260                                         continue;
 261                         }
 262
 263                         if (last != NULL) {
 264                                 struct mbuf *n;
 265
 266 #ifdef IPSEC
 267                                 /*
 268                                  * Check AH/ESP integrity.
 269                                  */
 270                                 if (ipsec6_in_reject_so(m, last->inp_socket))
 271                                         ipsec6stat.in_polvio++;
 272                                         /* do not inject data into pcb */
 273                                 else
 274 #endif /* IPSEC */
 275 #ifdef FAST_IPSEC
 276                                 /*
 277                                  * Check AH/ESP integrity.
 278                                  */
 279                                 if (ipsec6_in_reject(m, last))
 280                                         ;
 281                                 else
 282 #endif /* FAST_IPSEC */
 283                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 284                                         /*
 285                                          * KAME NOTE: do not
 286                                          * m_copy(m, offset, ...) above.
 287                                          * ssb_appendaddr() expects M_PKTHDR,
 288                                          * and m_copy() will copy M_PKTHDR
 289                                          * only if offset is 0.
 290                                          */
 291                                         so = last->in6p_socket;
 292                                         if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
 293                                             (so->so_options & SO_TIMESTAMP)) {
 294                                                 ip6_savecontrol(last, &opts,
 295                                                                 ip6, n);
 296                                         }
 297                                         m_adj(n, off + sizeof(struct udphdr));
 298                                         lwkt_gettoken(&so->so_rcv.ssb_token);
 299                                         if (ssb_appendaddr(&so->so_rcv,
 300                                                     (struct sockaddr *)&udp_in6,
 301                                                     n, opts) == 0) {
 302                                                 m_freem(n);
 303                                                 if (opts)
 304                                                         m_freem(opts);
 305                                                 udp_stat.udps_fullsock++;
 306                                         } else {
 307                                                 sorwakeup(so);
 308                                         }
 309                                         lwkt_reltoken(&so->so_rcv.ssb_token);
 310                                         opts = NULL;
 311                                 }
 312                         }
 313                         last = in6p;
 314                         /*
 315                          * Don't look for additional matches if this one does
 316                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 317                          * socket options set.  This heuristic avoids searching
 318                          * through all pcbs in the common case of a non-shared
 319                          * port.  It assumes that an application will never
 320                          * clear these options after setting them.
 321                          */
 322                         if ((last->in6p_socket->so_options &
 323                              (SO_REUSEPORT | SO_REUSEADDR)) == 0)
 324                                 break;
 325                 }
 326                 LIST_REMOVE(marker, inp_list);
 327
 328                 REL_PCBINFO_TOKEN(pcbinfo);
 329
 330                 if (last == NULL) {
 331                         /*
 332                          * No matching pcb found; discard datagram.
 333                          * (No need to send an ICMP Port Unreachable
 334                          * for a broadcast or multicast datgram.)
 335                          */
 336                         udp_stat.udps_noport++;
 337                         udp_stat.udps_noportmcast++;
 338                         goto bad;
 339                 }
 340 #ifdef IPSEC
 341                 /*
 342                  * Check AH/ESP integrity.
 343                  */
 344                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
 345                         ipsec6stat.in_polvio++;
 346                         goto bad;
 347                 }
 348 #endif /* IPSEC */
 349 #ifdef FAST_IPSEC
 350                 /*
 351                  * Check AH/ESP integrity.
 352                  */
 353                 if (ipsec6_in_reject(m, last)) {
 354                         goto bad;
 355                 }
 356 #endif /* FAST_IPSEC */
 357                 if (last->in6p_flags & IN6P_CONTROLOPTS
 358                     || last->in6p_socket->so_options & SO_TIMESTAMP)
 359                         ip6_savecontrol(last, &opts, ip6, m);
 360
 361                 m_adj(m, off + sizeof(struct udphdr));
 362                 so = last->in6p_socket;
 363                 lwkt_gettoken(&so->so_rcv.ssb_token);
 364                 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
 365                                    m, opts) == 0) {
 366                         udp_stat.udps_fullsock++;
 367                         lwkt_reltoken(&so->so_rcv.ssb_token);
 368                         goto bad;
 369                 }
 370                 sorwakeup(so);
 371                 lwkt_reltoken(&so->so_rcv.ssb_token);
 372                 return IPPROTO_DONE;
 373         }
 374         /*
 375          * Locate pcb for datagram.
 376          */
 377         in6p = in6_pcblookup_hash(pcbinfo, &ip6->ip6_src, uh->uh_sport,
 378                                   &ip6->ip6_dst, uh->uh_dport, 1,
 379                                   m->m_pkthdr.rcvif);
 380         if (in6p == NULL) {
 381                 if (log_in_vain) {
 382                         char buf[INET6_ADDRSTRLEN];
 383
 384                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
 385                         log(LOG_INFO,
 386                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 387                             buf, ntohs(uh->uh_dport),
 388                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 389                 }
 390                 udp_stat.udps_noport++;
 391                 if (m->m_flags & M_MCAST) {
 392                         kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
 393                         udp_stat.udps_noportmcast++;
 394                         goto bad;
 395                 }
 396                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 397                 return IPPROTO_DONE;
 398         }
 399 #ifdef IPSEC
 400         /*
 401          * Check AH/ESP integrity.
 402          */
 403         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 404                 ipsec6stat.in_polvio++;
 405                 goto bad;
 406         }
 407 #endif /* IPSEC */
 408 #ifdef FAST_IPSEC
 409         /*
 410          * Check AH/ESP integrity.
 411          */
 412         if (ipsec6_in_reject(m, in6p)) {
 413                 goto bad;
 414         }
 415 #endif /* FAST_IPSEC */
 416
 417         /*
 418          * Construct sockaddr format source address.
 419          * Stuff source address and datagram in user buffer.
 420          */
 421         init_sin6(&udp_in6, m); /* general init */
 422         udp_in6.sin6_port = uh->uh_sport;
 423         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 424             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 425                 ip6_savecontrol(in6p, &opts, ip6, m);
 426         m_adj(m, off + sizeof(struct udphdr));
 427         so = in6p->in6p_socket;
 428         lwkt_gettoken(&so->so_rcv.ssb_token);
 429         if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
 430                            m, opts) == 0) {
 431                 udp_stat.udps_fullsock++;
 432                 lwkt_reltoken(&so->so_rcv.ssb_token);
 433                 goto bad;
 434         }
 435         sorwakeup(so);
 436         lwkt_reltoken(&so->so_rcv.ssb_token);
 437         return IPPROTO_DONE;
 438 bad:
 439         if (m)
 440                 m_freem(m);
 441         if (opts)
 442                 m_freem(opts);
 443         return IPPROTO_DONE;
 444 }
 445
 446 void
 447 udp6_ctlinput(netmsg_t msg)
 448 {
 449         int cmd = msg->ctlinput.nm_cmd;
 450         struct sockaddr *sa = msg->ctlinput.nm_arg;
 451         void *d = msg->ctlinput.nm_extra;
 452         struct udphdr uh;
 453         struct ip6_hdr *ip6;
 454         struct mbuf *m;
 455         int off = 0;
 456         struct ip6ctlparam *ip6cp = NULL;
 457         const struct sockaddr_in6 *sa6_src = NULL;
 458         inp_notify_t notify = udp_notify;
 459         struct udp_portonly {
 460                 u_int16_t uh_sport;
 461                 u_int16_t uh_dport;
 462         } *uhp;
 463
 464         if (sa->sa_family != AF_INET6 ||
 465             sa->sa_len != sizeof(struct sockaddr_in6))
 466                 goto out;
 467
 468         if ((unsigned)cmd >= PRC_NCMDS)
 469                 goto out;
 470         if (PRC_IS_REDIRECT(cmd))
 471                 notify = in6_rtchange, d = NULL;
 472         else if (cmd == PRC_HOSTDEAD)
 473                 d = NULL;
 474         else if (inet6ctlerrmap[cmd] == 0)
 475                 goto out;
 476
 477         /* if the parameter is from icmp6, decode it. */
 478         if (d != NULL) {
 479                 ip6cp = (struct ip6ctlparam *)d;
 480                 m = ip6cp->ip6c_m;
 481                 ip6 = ip6cp->ip6c_ip6;
 482                 off = ip6cp->ip6c_off;
 483                 sa6_src = ip6cp->ip6c_src;
 484         } else {
 485                 m = NULL;
 486                 ip6 = NULL;
 487                 sa6_src = &sa6_any;
 488         }
 489
 490         if (ip6) {
 491                 /*
 492                  * XXX: We assume that when IPV6 is non NULL,
 493                  * M and OFF are valid.
 494                  */
 495
 496                 /* check if we can safely examine src and dst ports */
 497                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 498                         return;
 499
 500                 bzero(&uh, sizeof(uh));
 501                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 502
 503                 in6_pcbnotify(&udbinfo[0], sa, uh.uh_dport,
 504                               (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
 505                               cmd, 0, notify);
 506         } else {
 507                 in6_pcbnotify(&udbinfo[0], sa, 0,
 508                               (const struct sockaddr *)sa6_src, 0,
 509                               cmd, 0, notify);
 510         }
 511 out:
 512         lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
 513 }
 514
 515 static int
 516 udp6_getcred(SYSCTL_HANDLER_ARGS)
 517 {
 518         struct sockaddr_in6 addrs[2];
 519         struct inpcb *inp;
 520         int error;
 521
 522         error = priv_check(req->td, PRIV_ROOT);
 523         if (error)
 524                 return (error);
 525
 526         if (req->newlen != sizeof(addrs))
 527                 return (EINVAL);
 528         if (req->oldlen != sizeof(struct ucred))
 529                 return (EINVAL);
 530         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 531         if (error)
 532                 return (error);
 533         crit_enter();
 534         inp = in6_pcblookup_hash(&udbinfo[0], &addrs[1].sin6_addr,
 535                                  addrs[1].sin6_port,
 536                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 537                                  1, NULL);
 538         if (!inp || !inp->inp_socket) {
 539                 error = ENOENT;
 540                 goto out;
 541         }
 542         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
 543                            sizeof(struct ucred));
 544
 545 out:
 546         crit_exit();
 547         return (error);
 548 }
 549
 550 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 551             0, 0,
 552             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 553
 554 /*
 555  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
 556  *       will sofree() it when we return.
 557  */
 558 static void
 559 udp6_abort(netmsg_t msg)
 560 {
 561         struct socket *so = msg->abort.base.nm_so;
 562         struct inpcb *inp;
 563         int error;
 564
 565         inp = so->so_pcb;
 566         if (inp) {
 567                 soisdisconnected(so);
 568
 569                 in6_pcbdetach(inp);
 570                 error = 0;
 571         } else {
 572                 error = EINVAL;
 573         }
 574         lwkt_replymsg(&msg->abort.base.lmsg, error);
 575 }
 576
 577 static void
 578 udp6_attach(netmsg_t msg)
 579 {
 580         struct socket *so = msg->attach.base.nm_so;
 581         struct pru_attach_info *ai = msg->attach.nm_ai;
 582         struct inpcb *inp;
 583         int error;
 584
 585         inp = so->so_pcb;
 586         if (inp != NULL) {
 587                 error = EINVAL;
 588                 goto out;
 589         }
 590
 591         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
 592                 error = soreserve(so, udp_sendspace, udp_recvspace,
 593                     ai->sb_rlimit);
 594                 if (error)
 595                         goto out;
 596         }
 597
 598         error = in_pcballoc(so, &udbinfo[0]);
 599         if (error)
 600                 goto out;
 601
 602         inp = (struct inpcb *)so->so_pcb;
 603         inp->inp_vflag |= INP_IPV6;
 604         inp->in6p_hops = -1;    /* use kernel default */
 605         inp->in6p_cksum = -1;   /* just to be sure */
 606         /*
 607          * XXX: ugly!!
 608          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 609          * because the socket may be bound to an IPv6 wildcard address,
 610          * which may match an IPv4-mapped IPv6 address.
 611          */
 612         inp->inp_ip_ttl = ip_defttl;
 613         error = 0;
 614 out:
 615         lwkt_replymsg(&msg->attach.base.lmsg, error);
 616 }
 617
 618 static void
 619 udp6_bind(netmsg_t msg)
 620 {
 621         struct socket *so =msg->bind.base.nm_so;
 622         struct sockaddr *nam = msg->bind.nm_nam;
 623         struct thread *td = msg->bind.nm_td;
 624         struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
 625         struct inpcb *inp;
 626         int error;
 627
 628         inp = so->so_pcb;
 629         if (inp == NULL) {
 630                 error = EINVAL;
 631                 goto out;
 632         }
 633
 634         inp->inp_vflag &= ~INP_IPV4;
 635         inp->inp_vflag |= INP_IPV6;
 636         if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 637                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 638                         inp->inp_vflag |= INP_IPV4;
 639                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 640                         struct sockaddr_in sin;
 641
 642                         in6_sin6_2_sin(&sin, sin6_p);
 643                         inp->inp_vflag |= INP_IPV4;
 644                         inp->inp_vflag &= ~INP_IPV6;
 645                         crit_enter();
 646                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 647                         crit_exit();
 648                         goto out;
 649                 }
 650         }
 651
 652         crit_enter();
 653         error = in6_pcbbind(inp, nam, td);
 654         crit_exit();
 655         if (error == 0) {
 656                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 657                         inp->inp_flags |= INP_WASBOUND_NOTANY;
 658                 in_pcbinswildcardhash(inp);
 659         }
 660 out:
 661         lwkt_replymsg(&msg->bind.base.lmsg, error);
 662 }
 663
 664 static void
 665 udp6_connect(netmsg_t msg)
 666 {
 667         struct socket *so = msg->connect.base.nm_so;
 668         struct sockaddr *nam = msg->connect.nm_nam;
 669         struct thread *td = msg->connect.nm_td;
 670         struct inpcb *inp;
 671         int error;
 672
 673         inp = so->so_pcb;
 674         if (inp == NULL) {
 675                 error = EINVAL;
 676                 goto out;
 677         }
 678
 679         if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 680                 struct sockaddr_in6 *sin6_p;
 681
 682                 sin6_p = (struct sockaddr_in6 *)nam;
 683                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 684                         struct sockaddr_in sin;
 685
 686                         if (inp->inp_faddr.s_addr != INADDR_ANY) {
 687                                 error = EISCONN;
 688                                 goto out;
 689                         }
 690                         in6_sin6_2_sin(&sin, sin6_p);
 691                         crit_enter();
 692                         if (inp->inp_flags & INP_WILDCARD)
 693                                 in_pcbremwildcardhash(inp);
 694                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
 695                         crit_exit();
 696                         if (error == 0) {
 697                                 inp->inp_vflag |= INP_IPV4;
 698                                 inp->inp_vflag &= ~INP_IPV6;
 699                                 soisconnected(so);
 700                         }
 701                         goto out;
 702                 }
 703         }
 704         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 705                 error = EISCONN;
 706                 goto out;
 707         }
 708         if (inp->inp_flags & INP_WILDCARD)
 709                 in_pcbremwildcardhash(inp);
 710         if (!prison_remote_ip(td, nam)) {
 711                 error = EAFNOSUPPORT; /* IPv4 only jail */
 712                 goto out;
 713         }
 714         crit_enter();
 715         error = in6_pcbconnect(inp, nam, td);
 716         crit_exit();
 717         if (error == 0) {
 718                 soisconnected(so);
 719         } else if (error == EAFNOSUPPORT) {     /* connection dissolved */
 720                 /*
 721                  * Follow traditional BSD behavior and retain
 722                  * the local port binding.  But, fix the old misbehavior
 723                  * of overwriting any previously bound local address.
 724                  */
 725                 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
 726                         inp->in6p_laddr = kin6addr_any;
 727                 in_pcbinswildcardhash(inp);
 728         }
 729 out:
 730         lwkt_replymsg(&msg->connect.base.lmsg, error);
 731 }
 732
 733 static void
 734 udp6_detach(netmsg_t msg)
 735 {
 736         struct socket *so = msg->detach.base.nm_so;
 737         struct inpcb *inp;
 738         int error;
 739
 740         inp = so->so_pcb;
 741         if (inp) {
 742                 in6_pcbdetach(inp);
 743                 error = 0;
 744         } else {
 745                 error = EINVAL;
 746         }
 747         lwkt_replymsg(&msg->detach.base.lmsg, error);
 748 }
 749
 750 static void
 751 udp6_disconnect(netmsg_t msg)
 752 {
 753         struct socket *so = msg->disconnect.base.nm_so;
 754         struct inpcb *inp;
 755         int error;
 756
 757         inp = so->so_pcb;
 758         if (inp == NULL) {
 759                 error = EINVAL;
 760                 goto out;
 761         }
 762
 763         if (inp->inp_vflag & INP_IPV4) {
 764                 const struct pr_usrreqs *pru;
 765
 766                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 767                 pru->pru_disconnect(msg);       /* XXX on right port? */
 768                 return;
 769         }
 770
 771         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 772                 error = ENOTCONN;
 773         } else {
 774                 in6_pcbdisconnect(inp);
 775                 soclrstate(so, SS_ISCONNECTED);         /* XXX */
 776                 error = 0;
 777         }
 778 out:
 779         lwkt_replymsg(&msg->disconnect.base.lmsg, error);
 780 }
 781
 782 static void
 783 udp6_send(netmsg_t msg)
 784 {
 785         struct socket *so = msg->send.base.nm_so;
 786         struct mbuf *m = msg->send.nm_m;
 787         struct sockaddr *addr = msg->send.nm_addr;
 788         struct mbuf *control = msg->send.nm_control;
 789         struct thread *td = msg->send.nm_td;
 790         struct inpcb *inp;
 791         int error = 0;
 792
 793         inp = so->so_pcb;
 794         if (inp == NULL) {
 795                 error = EINVAL;
 796                 goto bad;
 797         }
 798
 799         if (addr) {
 800                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 801                         error = EINVAL;
 802                         goto bad;
 803                 }
 804                 if (addr->sa_family != AF_INET6) {
 805                         error = EAFNOSUPPORT;
 806                         goto bad;
 807                 }
 808         }
 809
 810         error = udp6_output(inp, m, addr, control, td);
 811         lwkt_replymsg(&msg->send.base.lmsg, error);
 812         return;
 813 bad:
 814         m_freem(m);
 815         lwkt_replymsg(&msg->send.base.lmsg, error);
 816 }
 817
 818 struct pr_usrreqs udp6_usrreqs = {
 819         .pru_abort = udp6_abort,
 820         .pru_accept = pr_generic_notsupp,
 821         .pru_attach = udp6_attach,
 822         .pru_bind = udp6_bind,
 823         .pru_connect = udp6_connect,
 824         .pru_connect2 = pr_generic_notsupp,
 825         .pru_control = in6_control_dispatch,
 826         .pru_detach = udp6_detach,
 827         .pru_disconnect = udp6_disconnect,
 828         .pru_listen = pr_generic_notsupp,
 829         .pru_peeraddr = in6_mapped_peeraddr_dispatch,
 830         .pru_rcvd = pr_generic_notsupp,
 831         .pru_rcvoob = pr_generic_notsupp,
 832         .pru_send = udp6_send,
 833         .pru_sense = pru_sense_null,
 834         .pru_shutdown = udp_shutdown,
 835         .pru_sockaddr = in6_mapped_sockaddr_dispatch,
 836         .pru_sosend = sosend,
 837         .pru_soreceive = soreceive
 838 };
 839