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 1.26 2007/04/22 01:13:14 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 #include <sys/priv.h>
  86
  87 #include <sys/thread2.h>
  88 #include <sys/socketvar2.h>
  89 #include <sys/msgport2.h>
  90
  91 #include <net/if.h>
  92 #include <net/route.h>
  93 #include <net/if_types.h>
  94
  95 #include <netinet/in.h>
  96 #include <netinet/in_systm.h>
  97 #include <netinet/ip.h>
  98 #include <netinet/in_pcb.h>
  99 #include <netinet/in_var.h>
 100 #include <netinet/ip_var.h>
 101 #include <netinet/udp.h>
 102 #include <netinet/udp_var.h>
 103 #include <netinet/ip6.h>
 104 #include <netinet6/ip6_var.h>
 105 #include <netinet6/in6_pcb.h>
 106 #include <netinet/icmp6.h>
 107 #include <netinet6/udp6_var.h>
 108 #include <netinet6/ip6protosw.h>
 109
 110 #ifdef IPSEC
 111 #include <netinet6/ipsec.h>
 112 #include <netinet6/ipsec6.h>
 113 #endif /* IPSEC */
 114
 115 #ifdef FAST_IPSEC
 116 #include <netproto/ipsec/ipsec.h>
 117 #include <netproto/ipsec/ipsec6.h>
 118 #endif /* FAST_IPSEC */
 119
 120 /*
 121  * UDP protocol inplementation.
 122  * Per RFC 768, August, 1980.
 123  */
 124
 125 extern  struct protosw inetsw[];
 126 static  int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
 127
 128 static int
 129 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
 130 {
 131         struct ip6_moptions *im6o = in6p->in6p_moptions;
 132         struct in6_multi_mship *imm;
 133
 134         if (im6o == NULL)
 135                 return 0;
 136
 137         for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
 138              imm = imm->i6mm_chain.le_next) {
 139                 if ((ifp == NULL ||
 140                      imm->i6mm_maddr->in6m_ifp == ifp) &&
 141                     IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
 142                                        ia6))
 143                         return 1;
 144         }
 145         return 0;
 146 }
 147
 148 int
 149 udp6_input(struct mbuf **mp, int *offp, int proto)
 150 {
 151         struct mbuf *m = *mp;
 152         struct ip6_hdr *ip6;
 153         struct udphdr *uh;
 154         struct inpcb *in6p;
 155         struct  mbuf *opts = NULL;
 156         int off = *offp;
 157         int plen, ulen;
 158         struct sockaddr_in6 udp_in6;
 159
 160         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 161
 162         ip6 = mtod(m, struct ip6_hdr *);
 163
 164         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
 165                 /* XXX send icmp6 host/port unreach? */
 166                 m_freem(m);
 167                 return IPPROTO_DONE;
 168         }
 169
 170         udpstat.udps_ipackets++;
 171
 172         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 173         uh = (struct udphdr *)((caddr_t)ip6 + off);
 174         ulen = ntohs((u_short)uh->uh_ulen);
 175
 176         if (plen != ulen) {
 177                 udpstat.udps_badlen++;
 178                 goto bad;
 179         }
 180
 181         /*
 182          * Checksum extended UDP header and data.
 183          */
 184         if (uh->uh_sum == 0)
 185                 udpstat.udps_nosum++;
 186         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 187                 udpstat.udps_badsum++;
 188                 goto bad;
 189         }
 190
 191         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 192                 struct  inpcb *last;
 193
 194                 /*
 195                  * Deliver a multicast datagram to all sockets
 196                  * for which the local and remote addresses and ports match
 197                  * those of the incoming datagram.  This allows more than
 198                  * one process to receive multicasts on the same port.
 199                  * (This really ought to be done for unicast datagrams as
 200                  * well, but that would cause problems with existing
 201                  * applications that open both address-specific sockets and
 202                  * a wildcard socket listening to the same port -- they would
 203                  * end up receiving duplicates of every unicast datagram.
 204                  * Those applications open the multiple sockets to overcome an
 205                  * inadequacy of the UDP socket interface, but for backwards
 206                  * compatibility we avoid the problem here rather than
 207                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 208                  */
 209
 210                 /*
 211                  * In a case that laddr should be set to the link-local
 212                  * address (this happens in RIPng), the multicast address
 213                  * specified in the received packet does not match with
 214                  * laddr. To cure this situation, the matching is relaxed
 215                  * if the receiving interface is the same as one specified
 216                  * in the socket and if the destination multicast address
 217                  * matches one of the multicast groups specified in the socket.
 218                  */
 219
 220                 /*
 221                  * Construct sockaddr format source address.
 222                  */
 223                 init_sin6(&udp_in6, m); /* general init */
 224                 udp_in6.sin6_port = uh->uh_sport;
 225                 /*
 226                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
 227                  * We need udphdr for IPsec processing so we do that later.
 228                  */
 229
 230                 /*
 231                  * Locate pcb(s) for datagram.
 232                  * (Algorithm copied from raw_intr().)
 233                  */
 234                 last = NULL;
 235                 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) {
 236                         if (in6p->inp_flags & INP_PLACEMARKER)
 237                                 continue;
 238                         if (!(in6p->inp_vflag & INP_IPV6))
 239                                 continue;
 240                         if (in6p->in6p_lport != uh->uh_dport)
 241                                 continue;
 242                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 243                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 244                                                         &ip6->ip6_dst) &&
 245                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
 246                                                  m->m_pkthdr.rcvif))
 247                                         continue;
 248                         }
 249                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 250                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 251                                                         &ip6->ip6_src) ||
 252                                    in6p->in6p_fport != uh->uh_sport)
 253                                         continue;
 254                         }
 255
 256                         if (last != NULL) {
 257                                 struct  mbuf *n;
 258
 259 #ifdef IPSEC
 260                                 /*
 261                                  * Check AH/ESP integrity.
 262                                  */
 263                                 if (ipsec6_in_reject_so(m, last->inp_socket))
 264                                         ipsec6stat.in_polvio++;
 265                                         /* do not inject data into pcb */
 266                                 else
 267 #endif /* IPSEC */
 268 #ifdef FAST_IPSEC
 269                                 /*
 270                                  * Check AH/ESP integrity.
 271                                  */
 272                                 if (ipsec6_in_reject(m, last))
 273                                         ;
 274                                 else
 275 #endif /* FAST_IPSEC */
 276                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 277                                         /*
 278                                          * KAME NOTE: do not
 279                                          * m_copy(m, offset, ...) above.
 280                                          * ssb_appendaddr() expects M_PKTHDR,
 281                                          * and m_copy() will copy M_PKTHDR
 282                                          * only if offset is 0.
 283                                          */
 284                                         if (last->in6p_flags & IN6P_CONTROLOPTS
 285                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
 286                                                 ip6_savecontrol(last, &opts,
 287                                                                 ip6, n);
 288
 289                                         m_adj(n, off + sizeof(struct udphdr));
 290                                         if (ssb_appendaddr(&last->in6p_socket->so_rcv,
 291                                                         (struct sockaddr *)&udp_in6,
 292                                                         n, opts) == 0) {
 293                                                 m_freem(n);
 294                                                 if (opts)
 295                                                         m_freem(opts);
 296                                                 udpstat.udps_fullsock++;
 297                                         } else
 298                                                 sorwakeup(last->in6p_socket);
 299                                         opts = NULL;
 300                                 }
 301                         }
 302                         last = in6p;
 303                         /*
 304                          * Don't look for additional matches if this one does
 305                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 306                          * socket options set.  This heuristic avoids searching
 307                          * through all pcbs in the common case of a non-shared
 308                          * port.  It assumes that an application will never
 309                          * clear these options after setting them.
 310                          */
 311                         if ((last->in6p_socket->so_options &
 312                              (SO_REUSEPORT | SO_REUSEADDR)) == 0)
 313                                 break;
 314                 }
 315
 316                 if (last == NULL) {
 317                         /*
 318                          * No matching pcb found; discard datagram.
 319                          * (No need to send an ICMP Port Unreachable
 320                          * for a broadcast or multicast datgram.)
 321                          */
 322                         udpstat.udps_noport++;
 323                         udpstat.udps_noportmcast++;
 324                         goto bad;
 325                 }
 326 #ifdef IPSEC
 327                 /*
 328                  * Check AH/ESP integrity.
 329                  */
 330                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
 331                         ipsec6stat.in_polvio++;
 332                         goto bad;
 333                 }
 334 #endif /* IPSEC */
 335 #ifdef FAST_IPSEC
 336                 /*
 337                  * Check AH/ESP integrity.
 338                  */
 339                 if (ipsec6_in_reject(m, last)) {
 340                         goto bad;
 341                 }
 342 #endif /* FAST_IPSEC */
 343                 if (last->in6p_flags & IN6P_CONTROLOPTS
 344                     || last->in6p_socket->so_options & SO_TIMESTAMP)
 345                         ip6_savecontrol(last, &opts, ip6, m);
 346
 347                 m_adj(m, off + sizeof(struct udphdr));
 348                 if (ssb_appendaddr(&last->in6p_socket->so_rcv,
 349                                 (struct sockaddr *)&udp_in6,
 350                                 m, opts) == 0) {
 351                         udpstat.udps_fullsock++;
 352                         goto bad;
 353                 }
 354                 sorwakeup(last->in6p_socket);
 355                 return IPPROTO_DONE;
 356         }
 357         /*
 358          * Locate pcb for datagram.
 359          */
 360         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
 361                                   &ip6->ip6_dst, uh->uh_dport, 1,
 362                                   m->m_pkthdr.rcvif);
 363         if (in6p == NULL) {
 364                 if (log_in_vain) {
 365                         char buf[INET6_ADDRSTRLEN];
 366
 367                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
 368                         log(LOG_INFO,
 369                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 370                             buf, ntohs(uh->uh_dport),
 371                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 372                 }
 373                 udpstat.udps_noport++;
 374                 if (m->m_flags & M_MCAST) {
 375                         kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
 376                         udpstat.udps_noportmcast++;
 377                         goto bad;
 378                 }
 379                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 380                 return IPPROTO_DONE;
 381         }
 382 #ifdef IPSEC
 383         /*
 384          * Check AH/ESP integrity.
 385          */
 386         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 387                 ipsec6stat.in_polvio++;
 388                 goto bad;
 389         }
 390 #endif /* IPSEC */
 391 #ifdef FAST_IPSEC
 392         /*
 393          * Check AH/ESP integrity.
 394          */
 395         if (ipsec6_in_reject(m, in6p)) {
 396                 goto bad;
 397         }
 398 #endif /* FAST_IPSEC */
 399
 400         /*
 401          * Construct sockaddr format source address.
 402          * Stuff source address and datagram in user buffer.
 403          */
 404         init_sin6(&udp_in6, m); /* general init */
 405         udp_in6.sin6_port = uh->uh_sport;
 406         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 407             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 408                 ip6_savecontrol(in6p, &opts, ip6, m);
 409         m_adj(m, off + sizeof(struct udphdr));
 410         if (ssb_appendaddr(&in6p->in6p_socket->so_rcv,
 411                         (struct sockaddr *)&udp_in6,
 412                         m, opts) == 0) {
 413                 udpstat.udps_fullsock++;
 414                 goto bad;
 415         }
 416         sorwakeup(in6p->in6p_socket);
 417         return IPPROTO_DONE;
 418 bad:
 419         if (m)
 420                 m_freem(m);
 421         if (opts)
 422                 m_freem(opts);
 423         return IPPROTO_DONE;
 424 }
 425
 426 void
 427 udp6_ctlinput(netmsg_t msg)
 428 {
 429         int cmd = msg->ctlinput.nm_cmd;
 430         struct sockaddr *sa = msg->ctlinput.nm_arg;
 431         void *d = msg->ctlinput.nm_extra;
 432         struct udphdr uh;
 433         struct ip6_hdr *ip6;
 434         struct mbuf *m;
 435         int off = 0;
 436         struct ip6ctlparam *ip6cp = NULL;
 437         const struct sockaddr_in6 *sa6_src = NULL;
 438         void (*notify) (struct inpcb *, int) = udp_notify;
 439         struct udp_portonly {
 440                 u_int16_t uh_sport;
 441                 u_int16_t uh_dport;
 442         } *uhp;
 443
 444         if (sa->sa_family != AF_INET6 ||
 445             sa->sa_len != sizeof(struct sockaddr_in6))
 446                 goto out;
 447
 448         if ((unsigned)cmd >= PRC_NCMDS)
 449                 goto out;
 450         if (PRC_IS_REDIRECT(cmd))
 451                 notify = in6_rtchange, d = NULL;
 452         else if (cmd == PRC_HOSTDEAD)
 453                 d = NULL;
 454         else if (inet6ctlerrmap[cmd] == 0)
 455                 goto out;
 456
 457         /* if the parameter is from icmp6, decode it. */
 458         if (d != NULL) {
 459                 ip6cp = (struct ip6ctlparam *)d;
 460                 m = ip6cp->ip6c_m;
 461                 ip6 = ip6cp->ip6c_ip6;
 462                 off = ip6cp->ip6c_off;
 463                 sa6_src = ip6cp->ip6c_src;
 464         } else {
 465                 m = NULL;
 466                 ip6 = NULL;
 467                 sa6_src = &sa6_any;
 468         }
 469
 470         if (ip6) {
 471                 /*
 472                  * XXX: We assume that when IPV6 is non NULL,
 473                  * M and OFF are valid.
 474                  */
 475
 476                 /* check if we can safely examine src and dst ports */
 477                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 478                         return;
 479
 480                 bzero(&uh, sizeof(uh));
 481                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 482
 483                 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport,
 484                               (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
 485                               cmd, 0, notify);
 486         } else {
 487                 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0,
 488                               (const struct sockaddr *)sa6_src, 0,
 489                               cmd, 0, notify);
 490         }
 491 out:
 492         lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
 493 }
 494
 495 static int
 496 udp6_getcred(SYSCTL_HANDLER_ARGS)
 497 {
 498         struct sockaddr_in6 addrs[2];
 499         struct inpcb *inp;
 500         int error;
 501
 502         error = priv_check(req->td, PRIV_ROOT);
 503         if (error)
 504                 return (error);
 505
 506         if (req->newlen != sizeof(addrs))
 507                 return (EINVAL);
 508         if (req->oldlen != sizeof(struct ucred))
 509                 return (EINVAL);
 510         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 511         if (error)
 512                 return (error);
 513         crit_enter();
 514         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
 515                                  addrs[1].sin6_port,
 516                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 517                                  1, NULL);
 518         if (!inp || !inp->inp_socket) {
 519                 error = ENOENT;
 520                 goto out;
 521         }
 522         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
 523                            sizeof(struct ucred));
 524
 525 out:
 526         crit_exit();
 527         return (error);
 528 }
 529
 530 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 531             0, 0,
 532             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 533
 534 /*
 535  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
 536  *       will sofree() it when we return.
 537  */
 538 static void
 539 udp6_abort(netmsg_t msg)
 540 {
 541         struct socket *so = msg->abort.base.nm_so;
 542         struct inpcb *inp;
 543         int error;
 544
 545         inp = so->so_pcb;
 546         if (inp) {
 547                 soisdisconnected(so);
 548                 in6_pcbdetach(inp);
 549                 error = 0;
 550         } else {
 551                 error = EINVAL;
 552         }
 553         lwkt_replymsg(&msg->abort.base.lmsg, error);
 554 }
 555
 556 static void
 557 udp6_attach(netmsg_t msg)
 558 {
 559         struct socket *so = msg->attach.base.nm_so;
 560         struct pru_attach_info *ai = msg->attach.nm_ai;
 561         struct inpcb *inp;
 562         int error;
 563
 564         inp = so->so_pcb;
 565         if (inp != NULL) {
 566                 error = EINVAL;
 567                 goto out;
 568         }
 569
 570         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
 571                 error = soreserve(so, udp_sendspace, udp_recvspace,
 572                     ai->sb_rlimit);
 573                 if (error)
 574                         goto out;
 575         }
 576         crit_enter();
 577         error = in_pcballoc(so, &udbinfo);
 578         crit_exit();
 579         if (error)
 580                 goto out;
 581         sosetport(so, cpu_portfn(0));
 582         inp = (struct inpcb *)so->so_pcb;
 583         inp->inp_vflag |= INP_IPV6;
 584         if (!ip6_v6only)
 585                 inp->inp_vflag |= INP_IPV4;
 586         inp->in6p_hops = -1;    /* use kernel default */
 587         inp->in6p_cksum = -1;   /* just to be sure */
 588         /*
 589          * XXX: ugly!!
 590          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 591          * because the socket may be bound to an IPv6 wildcard address,
 592          * which may match an IPv4-mapped IPv6 address.
 593          */
 594         inp->inp_ip_ttl = ip_defttl;
 595         error = 0;
 596 out:
 597         lwkt_replymsg(&msg->attach.base.lmsg, error);
 598 }
 599
 600 static void
 601 udp6_bind(netmsg_t msg)
 602 {
 603         struct socket *so =msg->bind.base.nm_so;
 604         struct sockaddr *nam = msg->bind.nm_nam;
 605         struct thread *td = msg->bind.nm_td;
 606         struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
 607         struct inpcb *inp;
 608         int error;
 609
 610         inp = so->so_pcb;
 611         if (inp == NULL) {
 612                 error = EINVAL;
 613                 goto out;
 614         }
 615
 616         inp->inp_vflag &= ~INP_IPV4;
 617         inp->inp_vflag |= INP_IPV6;
 618         if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 619                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 620                         inp->inp_vflag |= INP_IPV4;
 621                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 622                         struct sockaddr_in sin;
 623
 624                         in6_sin6_2_sin(&sin, sin6_p);
 625                         inp->inp_vflag |= INP_IPV4;
 626                         inp->inp_vflag &= ~INP_IPV6;
 627                         crit_enter();
 628                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 629                         crit_exit();
 630                         goto out;
 631                 }
 632         }
 633
 634         crit_enter();
 635         error = in6_pcbbind(inp, nam, td);
 636         crit_exit();
 637         if (error == 0) {
 638                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 639                         inp->inp_flags |= INP_WASBOUND_NOTANY;
 640                 in_pcbinswildcardhash(inp);
 641         }
 642 out:
 643         lwkt_replymsg(&msg->bind.base.lmsg, error);
 644 }
 645
 646 static void
 647 udp6_connect(netmsg_t msg)
 648 {
 649         struct socket *so = msg->connect.base.nm_so;
 650         struct sockaddr *nam = msg->connect.nm_nam;
 651         struct thread *td = msg->connect.nm_td;
 652         struct inpcb *inp;
 653         int error;
 654
 655         inp = so->so_pcb;
 656         if (inp == NULL) {
 657                 error = EINVAL;
 658                 goto out;
 659         }
 660
 661         if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 662                 struct sockaddr_in6 *sin6_p;
 663
 664                 sin6_p = (struct sockaddr_in6 *)nam;
 665                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 666                         struct sockaddr_in sin;
 667
 668                         if (inp->inp_faddr.s_addr != INADDR_ANY) {
 669                                 error = EISCONN;
 670                                 goto out;
 671                         }
 672                         in6_sin6_2_sin(&sin, sin6_p);
 673                         crit_enter();
 674                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
 675                         crit_exit();
 676                         if (error == 0) {
 677                                 inp->inp_vflag |= INP_IPV4;
 678                                 inp->inp_vflag &= ~INP_IPV6;
 679                                 soisconnected(so);
 680                         }
 681                         goto out;
 682                 }
 683         }
 684         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 685                 error = EISCONN;
 686                 goto out;
 687         }
 688         if (inp->inp_flags & INP_WILDCARD)
 689                 in_pcbremwildcardhash(inp);
 690         if (!prison_remote_ip(td, nam)) {
 691                 error = EAFNOSUPPORT; /* IPv4 only jail */
 692                 goto out;
 693         }
 694         crit_enter();
 695         error = in6_pcbconnect(inp, nam, td);
 696         crit_exit();
 697         if (error == 0) {
 698                 if (!ip6_v6only) { /* should be non mapped addr */
 699                         inp->inp_vflag &= ~INP_IPV4;
 700                         inp->inp_vflag |= INP_IPV6;
 701                 }
 702                 soisconnected(so);
 703         } else if (error == EAFNOSUPPORT) {     /* connection dissolved */
 704                 /*
 705                  * Follow traditional BSD behavior and retain
 706                  * the local port binding.  But, fix the old misbehavior
 707                  * of overwriting any previously bound local address.
 708                  */
 709                 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
 710                         inp->in6p_laddr = kin6addr_any;
 711                 in_pcbinswildcardhash(inp);
 712         }
 713 out:
 714         lwkt_replymsg(&msg->connect.base.lmsg, error);
 715 }
 716
 717 static void
 718 udp6_detach(netmsg_t msg)
 719 {
 720         struct socket *so = msg->detach.base.nm_so;
 721         struct inpcb *inp;
 722         int error;
 723
 724         inp = so->so_pcb;
 725         if (inp) {
 726                 crit_enter();
 727                 in6_pcbdetach(inp);
 728                 crit_exit();
 729                 error = 0;
 730         } else {
 731                 error = EINVAL;
 732         }
 733         lwkt_replymsg(&msg->detach.base.lmsg, error);
 734 }
 735
 736 static void
 737 udp6_disconnect(netmsg_t msg)
 738 {
 739         struct socket *so = msg->disconnect.base.nm_so;
 740         struct inpcb *inp;
 741         int error;
 742
 743         inp = so->so_pcb;
 744         if (inp == NULL) {
 745                 error = EINVAL;
 746                 goto out;
 747         }
 748
 749         if (inp->inp_vflag & INP_IPV4) {
 750                 const struct pr_usrreqs *pru;
 751
 752                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 753                 pru->pru_disconnect(msg);       /* XXX on right port? */
 754                 return;
 755         }
 756
 757         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 758                 error = ENOTCONN;
 759         } else {
 760                 crit_enter();
 761                 in6_pcbdisconnect(inp);
 762                 crit_exit();
 763                 soclrstate(so, SS_ISCONNECTED);         /* XXX */
 764                 error = 0;
 765         }
 766 out:
 767         lwkt_replymsg(&msg->disconnect.base.lmsg, error);
 768 }
 769
 770 static void
 771 udp6_send(netmsg_t msg)
 772 {
 773         struct socket *so = msg->send.base.nm_so;
 774         struct mbuf *m = msg->send.nm_m;
 775         struct sockaddr *addr = msg->send.nm_addr;
 776         struct mbuf *control = msg->send.nm_control;
 777         struct thread *td = msg->send.nm_td;
 778         struct inpcb *inp;
 779         int error = 0;
 780
 781         inp = so->so_pcb;
 782         if (inp == NULL) {
 783                 error = EINVAL;
 784                 goto bad;
 785         }
 786
 787         if (addr) {
 788                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 789                         error = EINVAL;
 790                         goto bad;
 791                 }
 792                 if (addr->sa_family != AF_INET6) {
 793                         error = EAFNOSUPPORT;
 794                         goto bad;
 795                 }
 796         }
 797
 798         if (!ip6_v6only) {
 799                 int hasv4addr;
 800                 struct sockaddr_in6 *sin6 = 0;
 801
 802                 if (addr == NULL)
 803                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 804                 else {
 805                         sin6 = (struct sockaddr_in6 *)addr;
 806                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 807                                 ? 1 : 0;
 808                 }
 809                 if (hasv4addr) {
 810                         const struct pr_usrreqs *pru;
 811
 812                         if (sin6)
 813                                 in6_sin6_2_sin_in_sock(addr);
 814                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 815                         pru->pru_send(msg);
 816                         /* msg invalid now */
 817                         return;
 818                 }
 819         }
 820
 821         error = udp6_output(inp, m, addr, control, td);
 822 bad:
 823         m_freem(m);
 824         lwkt_replymsg(&msg->send.base.lmsg, error);
 825 }
 826
 827 struct pr_usrreqs udp6_usrreqs = {
 828         .pru_abort = udp6_abort,
 829         .pru_accept = pr_generic_notsupp,
 830         .pru_attach = udp6_attach,
 831         .pru_bind = udp6_bind,
 832         .pru_connect = udp6_connect,
 833         .pru_connect2 = pr_generic_notsupp,
 834         .pru_control = in6_control_dispatch,
 835         .pru_detach = udp6_detach,
 836         .pru_disconnect = udp6_disconnect,
 837         .pru_listen = pr_generic_notsupp,
 838         .pru_peeraddr = in6_mapped_peeraddr_dispatch,
 839         .pru_rcvd = pr_generic_notsupp,
 840         .pru_rcvoob = pr_generic_notsupp,
 841         .pru_send = udp6_send,
 842         .pru_sense = pru_sense_null,
 843         .pru_shutdown = udp_shutdown,
 844         .pru_sockaddr = in6_mapped_sockaddr_dispatch,
 845         .pru_sosend = sosend,
 846         .pru_soreceive = soreceive
 847 };
 848