sys/netinet6/udp6_usrreq.c

   1 /*-
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   4  * Copyright (c) 2014 Kevin Lo
   5  * All rights reserved.
   6  *
   7  * Portions of this software were developed by Robert N. M. Watson under
   8  * contract to Juniper Networks, Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the project nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
  35  *      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
  36  */
  37
  38 /*-
  39  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
  40  *      The Regents of the University of California.
  41  * All rights reserved.
  42  *
  43  * Redistribution and use in source and binary forms, with or without
  44  * modification, are permitted provided that the following conditions
  45  * are met:
  46  * 1. Redistributions of source code must retain the above copyright
  47  *    notice, this list of conditions and the following disclaimer.
  48  * 2. Redistributions in binary form must reproduce the above copyright
  49  *    notice, this list of conditions and the following disclaimer in the
  50  *    documentation and/or other materials provided with the distribution.
  51  * 4. Neither the name of the University nor the names of its contributors
  52  *    may be used to endorse or promote products derived from this software
  53  *    without specific prior written permission.
  54  *
  55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  65  * SUCH DAMAGE.
  66  *
  67  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  68  */
  69
  70 #include <sys/cdefs.h>
  71 __FBSDID("$FreeBSD$");
  72
  73 #include "opt_inet.h"
  74 #include "opt_inet6.h"
  75 #include "opt_ipfw.h"
  76 #include "opt_ipsec.h"
  77 #include "opt_rss.h"
  78
  79 #include <sys/param.h>
  80 #include <sys/jail.h>
  81 #include <sys/kernel.h>
  82 #include <sys/lock.h>
  83 #include <sys/mbuf.h>
  84 #include <sys/priv.h>
  85 #include <sys/proc.h>
  86 #include <sys/protosw.h>
  87 #include <sys/sdt.h>
  88 #include <sys/signalvar.h>
  89 #include <sys/socket.h>
  90 #include <sys/socketvar.h>
  91 #include <sys/sx.h>
  92 #include <sys/sysctl.h>
  93 #include <sys/syslog.h>
  94 #include <sys/systm.h>
  95
  96 #include <net/if.h>
  97 #include <net/if_var.h>
  98 #include <net/if_types.h>
  99 #include <net/route.h>
 100
 101 #include <netinet/in.h>
 102 #include <netinet/in_kdtrace.h>
 103 #include <netinet/in_pcb.h>
 104 #include <netinet/in_systm.h>
 105 #include <netinet/in_var.h>
 106 #include <netinet/ip.h>
 107 #include <netinet/ip_icmp.h>
 108 #include <netinet/ip6.h>
 109 #include <netinet/icmp_var.h>
 110 #include <netinet/icmp6.h>
 111 #include <netinet/ip_var.h>
 112 #include <netinet/udp.h>
 113 #include <netinet/udp_var.h>
 114 #include <netinet/udplite.h>
 115 #include <netinet/in_rss.h>
 116
 117 #include <netinet6/ip6protosw.h>
 118 #include <netinet6/ip6_var.h>
 119 #include <netinet6/in6_pcb.h>
 120 #include <netinet6/udp6_var.h>
 121 #include <netinet6/scope6_var.h>
 122
 123 #ifdef IPSEC
 124 #include <netipsec/ipsec.h>
 125 #include <netipsec/ipsec6.h>
 126 #endif /* IPSEC */
 127
 128 #include <security/mac/mac_framework.h>
 129
 130 /*
 131  * UDP protocol implementation.
 132  * Per RFC 768, August, 1980.
 133  */
 134
 135 extern struct protosw   inetsw[];
 136 static void             udp6_detach(struct socket *so);
 137
 138 static void
 139 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
 140     struct sockaddr_in6 *fromsa)
 141 {
 142         struct socket *so;
 143         struct mbuf *opts;
 144         struct udpcb *up;
 145
 146         INP_LOCK_ASSERT(inp);
 147
 148         /*
 149          * Engage the tunneling protocol.
 150          */
 151         up = intoudpcb(inp);
 152         if (up->u_tun_func != NULL) {
 153                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa,
 154                     up->u_tun_ctx);
 155                 return;
 156         }
 157 #ifdef IPSEC
 158         /* Check AH/ESP integrity. */
 159         if (ipsec6_in_reject(n, inp)) {
 160                 m_freem(n);
 161                 IPSEC6STAT_INC(ips_in_polvio);
 162                 return;
 163         }
 164 #endif /* IPSEC */
 165 #ifdef MAC
 166         if (mac_inpcb_check_deliver(inp, n) != 0) {
 167                 m_freem(n);
 168                 return;
 169         }
 170 #endif
 171         opts = NULL;
 172         if (inp->inp_flags & INP_CONTROLOPTS ||
 173             inp->inp_socket->so_options & SO_TIMESTAMP)
 174                 ip6_savecontrol(inp, n, &opts);
 175         m_adj(n, off + sizeof(struct udphdr));
 176
 177         so = inp->inp_socket;
 178         SOCKBUF_LOCK(&so->so_rcv);
 179         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
 180             opts) == 0) {
 181                 SOCKBUF_UNLOCK(&so->so_rcv);
 182                 m_freem(n);
 183                 if (opts)
 184                         m_freem(opts);
 185                 UDPSTAT_INC(udps_fullsock);
 186         } else
 187                 sorwakeup_locked(so);
 188 }
 189
 190 int
 191 udp6_input(struct mbuf **mp, int *offp, int proto)
 192 {
 193         struct mbuf *m = *mp;
 194         struct ifnet *ifp;
 195         struct ip6_hdr *ip6;
 196         struct udphdr *uh;
 197         struct inpcb *inp;
 198         struct inpcbinfo *pcbinfo;
 199         struct udpcb *up;
 200         int off = *offp;
 201         int cscov_partial;
 202         int plen, ulen;
 203         struct sockaddr_in6 fromsa;
 204         struct m_tag *fwd_tag;
 205         uint16_t uh_sum;
 206         uint8_t nxt;
 207
 208         ifp = m->m_pkthdr.rcvif;
 209         ip6 = mtod(m, struct ip6_hdr *);
 210
 211         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
 212                 /* XXX send icmp6 host/port unreach? */
 213                 m_freem(m);
 214                 return (IPPROTO_DONE);
 215         }
 216
 217 #ifndef PULLDOWN_TEST
 218         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 219         ip6 = mtod(m, struct ip6_hdr *);
 220         uh = (struct udphdr *)((caddr_t)ip6 + off);
 221 #else
 222         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
 223         if (!uh)
 224                 return (IPPROTO_DONE);
 225 #endif
 226
 227         UDPSTAT_INC(udps_ipackets);
 228
 229         /*
 230          * Destination port of 0 is illegal, based on RFC768.
 231          */
 232         if (uh->uh_dport == 0)
 233                 goto badunlocked;
 234
 235         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 236         ulen = ntohs((u_short)uh->uh_ulen);
 237
 238         nxt = ip6->ip6_nxt;
 239         cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
 240         if (nxt == IPPROTO_UDPLITE) {
 241                 /* Zero means checksum over the complete packet. */
 242                 if (ulen == 0)
 243                         ulen = plen;
 244                 if (ulen == plen)
 245                         cscov_partial = 0;
 246                 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
 247                         /* XXX: What is the right UDPLite MIB counter? */
 248                         goto badunlocked;
 249                 }
 250                 if (uh->uh_sum == 0) {
 251                         /* XXX: What is the right UDPLite MIB counter? */
 252                         goto badunlocked;
 253                 }
 254         } else {
 255                 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
 256                         UDPSTAT_INC(udps_badlen);
 257                         goto badunlocked;
 258                 }
 259                 if (uh->uh_sum == 0) {
 260                         UDPSTAT_INC(udps_nosum);
 261                         goto badunlocked;
 262                 }
 263         }
 264
 265         if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
 266             !cscov_partial) {
 267                 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 268                         uh_sum = m->m_pkthdr.csum_data;
 269                 else
 270                         uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
 271                             m->m_pkthdr.csum_data);
 272                 uh_sum ^= 0xffff;
 273         } else
 274                 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
 275
 276         if (uh_sum != 0) {
 277                 UDPSTAT_INC(udps_badsum);
 278                 goto badunlocked;
 279         }
 280
 281         /*
 282          * Construct sockaddr format source address.
 283          */
 284         init_sin6(&fromsa, m);
 285         fromsa.sin6_port = uh->uh_sport;
 286
 287         pcbinfo = get_inpcbinfo(nxt);
 288         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 289                 struct inpcb *last;
 290                 struct inpcbhead *pcblist;
 291                 struct ip6_moptions *imo;
 292
 293                 INP_INFO_RLOCK(pcbinfo);
 294                 /*
 295                  * In the event that laddr should be set to the link-local
 296                  * address (this happens in RIPng), the multicast address
 297                  * specified in the received packet will not match laddr.  To
 298                  * handle this situation, matching is relaxed if the
 299                  * receiving interface is the same as one specified in the
 300                  * socket and if the destination multicast address matches
 301                  * one of the multicast groups specified in the socket.
 302                  */
 303
 304                 /*
 305                  * KAME note: traditionally we dropped udpiphdr from mbuf
 306                  * here.  We need udphdr for IPsec processing so we do that
 307                  * later.
 308                  */
 309                 pcblist = get_pcblist(nxt);
 310                 last = NULL;
 311                 LIST_FOREACH(inp, pcblist, inp_list) {
 312                         if ((inp->inp_vflag & INP_IPV6) == 0)
 313                                 continue;
 314                         if (inp->inp_lport != uh->uh_dport)
 315                                 continue;
 316                         if (inp->inp_fport != 0 &&
 317                             inp->inp_fport != uh->uh_sport)
 318                                 continue;
 319                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 320                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 321                                                         &ip6->ip6_dst))
 322                                         continue;
 323                         }
 324                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 325                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 326                                                         &ip6->ip6_src) ||
 327                                     inp->inp_fport != uh->uh_sport)
 328                                         continue;
 329                         }
 330
 331                         /*
 332                          * XXXRW: Because we weren't holding either the inpcb
 333                          * or the hash lock when we checked for a match
 334                          * before, we should probably recheck now that the
 335                          * inpcb lock is (supposed to be) held.
 336                          */
 337
 338                         /*
 339                          * Handle socket delivery policy for any-source
 340                          * and source-specific multicast. [RFC3678]
 341                          */
 342                         imo = inp->in6p_moptions;
 343                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 344                                 struct sockaddr_in6      mcaddr;
 345                                 int                      blocked;
 346
 347                                 INP_RLOCK(inp);
 348
 349                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
 350                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
 351                                 mcaddr.sin6_family = AF_INET6;
 352                                 mcaddr.sin6_addr = ip6->ip6_dst;
 353
 354                                 blocked = im6o_mc_filter(imo, ifp,
 355                                         (struct sockaddr *)&mcaddr,
 356                                         (struct sockaddr *)&fromsa);
 357                                 if (blocked != MCAST_PASS) {
 358                                         if (blocked == MCAST_NOTGMEMBER)
 359                                                 IP6STAT_INC(ip6s_notmember);
 360                                         if (blocked == MCAST_NOTSMEMBER ||
 361                                             blocked == MCAST_MUTED)
 362                                                 UDPSTAT_INC(udps_filtermcast);
 363                                         INP_RUNLOCK(inp); /* XXX */
 364                                         continue;
 365                                 }
 366
 367                                 INP_RUNLOCK(inp);
 368                         }
 369                         if (last != NULL) {
 370                                 struct mbuf *n;
 371
 372                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 373                                         INP_RLOCK(last);
 374                                         UDP_PROBE(receive, NULL, last, ip6,
 375                                             last, uh);
 376                                         udp6_append(last, n, off, &fromsa);
 377                                         INP_RUNLOCK(last);
 378                                 }
 379                         }
 380                         last = inp;
 381                         /*
 382                          * Don't look for additional matches if this one does
 383                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 384                          * socket options set.  This heuristic avoids
 385                          * searching through all pcbs in the common case of a
 386                          * non-shared port.  It assumes that an application
 387                          * will never clear these options after setting them.
 388                          */
 389                         if ((last->inp_socket->so_options &
 390                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 391                                 break;
 392                 }
 393
 394                 if (last == NULL) {
 395                         /*
 396                          * No matching pcb found; discard datagram.  (No need
 397                          * to send an ICMP Port Unreachable for a broadcast
 398                          * or multicast datgram.)
 399                          */
 400                         UDPSTAT_INC(udps_noport);
 401                         UDPSTAT_INC(udps_noportmcast);
 402                         goto badheadlocked;
 403                 }
 404                 INP_RLOCK(last);
 405                 INP_INFO_RUNLOCK(pcbinfo);
 406                 UDP_PROBE(receive, NULL, last, ip6, last, uh);
 407                 udp6_append(last, m, off, &fromsa);
 408                 INP_RUNLOCK(last);
 409                 return (IPPROTO_DONE);
 410         }
 411         /*
 412          * Locate pcb for datagram.
 413          */
 414
 415         /*
 416          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 417          */
 418         if ((m->m_flags & M_IP6_NEXTHOP) &&
 419             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 420                 struct sockaddr_in6 *next_hop6;
 421
 422                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
 423
 424                 /*
 425                  * Transparently forwarded. Pretend to be the destination.
 426                  * Already got one like this?
 427                  */
 428                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 429                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 430                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
 431                 if (!inp) {
 432                         /*
 433                          * It's new.  Try to find the ambushing socket.
 434                          * Because we've rewritten the destination address,
 435                          * any hardware-generated hash is ignored.
 436                          */
 437                         inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
 438                             uh->uh_sport, &next_hop6->sin6_addr,
 439                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
 440                             uh->uh_dport, INPLOOKUP_WILDCARD |
 441                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
 442                 }
 443                 /* Remove the tag from the packet. We don't need it anymore. */
 444                 m_tag_delete(m, fwd_tag);
 445                 m->m_flags &= ~M_IP6_NEXTHOP;
 446         } else
 447                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 448                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 449                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 450                     m->m_pkthdr.rcvif, m);
 451         if (inp == NULL) {
 452                 if (udp_log_in_vain) {
 453                         char ip6bufs[INET6_ADDRSTRLEN];
 454                         char ip6bufd[INET6_ADDRSTRLEN];
 455
 456                         log(LOG_INFO,
 457                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 458                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 459                             ntohs(uh->uh_dport),
 460                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 461                             ntohs(uh->uh_sport));
 462                 }
 463                 UDPSTAT_INC(udps_noport);
 464                 if (m->m_flags & M_MCAST) {
 465                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 466                         UDPSTAT_INC(udps_noportmcast);
 467                         goto badunlocked;
 468                 }
 469                 if (V_udp_blackhole)
 470                         goto badunlocked;
 471                 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
 472                         goto badunlocked;
 473                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 474                 return (IPPROTO_DONE);
 475         }
 476         INP_RLOCK_ASSERT(inp);
 477         up = intoudpcb(inp);
 478         if (cscov_partial) {
 479                 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
 480                         INP_RUNLOCK(inp);
 481                         m_freem(m);
 482                         return (IPPROTO_DONE);
 483                 }
 484         }
 485         UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
 486         udp6_append(inp, m, off, &fromsa);
 487         INP_RUNLOCK(inp);
 488         return (IPPROTO_DONE);
 489
 490 badheadlocked:
 491         INP_INFO_RUNLOCK(pcbinfo);
 492 badunlocked:
 493         if (m)
 494                 m_freem(m);
 495         return (IPPROTO_DONE);
 496 }
 497
 498 static void
 499 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
 500     struct inpcbinfo *pcbinfo)
 501 {
 502         struct udphdr uh;
 503         struct ip6_hdr *ip6;
 504         struct mbuf *m;
 505         int off = 0;
 506         struct ip6ctlparam *ip6cp = NULL;
 507         const struct sockaddr_in6 *sa6_src = NULL;
 508         void *cmdarg;
 509         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
 510         struct udp_portonly {
 511                 u_int16_t uh_sport;
 512                 u_int16_t uh_dport;
 513         } *uhp;
 514
 515         if (sa->sa_family != AF_INET6 ||
 516             sa->sa_len != sizeof(struct sockaddr_in6))
 517                 return;
 518
 519         if ((unsigned)cmd >= PRC_NCMDS)
 520                 return;
 521         if (PRC_IS_REDIRECT(cmd))
 522                 notify = in6_rtchange, d = NULL;
 523         else if (cmd == PRC_HOSTDEAD)
 524                 d = NULL;
 525         else if (inet6ctlerrmap[cmd] == 0)
 526                 return;
 527
 528         /* if the parameter is from icmp6, decode it. */
 529         if (d != NULL) {
 530                 ip6cp = (struct ip6ctlparam *)d;
 531                 m = ip6cp->ip6c_m;
 532                 ip6 = ip6cp->ip6c_ip6;
 533                 off = ip6cp->ip6c_off;
 534                 cmdarg = ip6cp->ip6c_cmdarg;
 535                 sa6_src = ip6cp->ip6c_src;
 536         } else {
 537                 m = NULL;
 538                 ip6 = NULL;
 539                 cmdarg = NULL;
 540                 sa6_src = &sa6_any;
 541         }
 542
 543         if (ip6) {
 544                 /*
 545                  * XXX: We assume that when IPV6 is non NULL,
 546                  * M and OFF are valid.
 547                  */
 548
 549                 /* Check if we can safely examine src and dst ports. */
 550                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 551                         return;
 552
 553                 bzero(&uh, sizeof(uh));
 554                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 555
 556                 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
 557                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
 558                     cmdarg, notify);
 559         } else
 560                 (void)in6_pcbnotify(pcbinfo, sa, 0,
 561                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
 562 }
 563
 564 void
 565 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 566 {
 567
 568         return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
 569 }
 570
 571 void
 572 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 573 {
 574
 575         return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
 576 }
 577
 578 static int
 579 udp6_getcred(SYSCTL_HANDLER_ARGS)
 580 {
 581         struct xucred xuc;
 582         struct sockaddr_in6 addrs[2];
 583         struct inpcb *inp;
 584         int error;
 585
 586         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 587         if (error)
 588                 return (error);
 589
 590         if (req->newlen != sizeof(addrs))
 591                 return (EINVAL);
 592         if (req->oldlen != sizeof(struct xucred))
 593                 return (EINVAL);
 594         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 595         if (error)
 596                 return (error);
 597         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
 598             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
 599                 return (error);
 600         }
 601         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
 602             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
 603             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 604         if (inp != NULL) {
 605                 INP_RLOCK_ASSERT(inp);
 606                 if (inp->inp_socket == NULL)
 607                         error = ENOENT;
 608                 if (error == 0)
 609                         error = cr_canseesocket(req->td->td_ucred,
 610                             inp->inp_socket);
 611                 if (error == 0)
 612                         cru2x(inp->inp_cred, &xuc);
 613                 INP_RUNLOCK(inp);
 614         } else
 615                 error = ENOENT;
 616         if (error == 0)
 617                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 618         return (error);
 619 }
 620
 621 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
 622     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
 623
 624 static int
 625 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
 626     struct mbuf *control, struct thread *td)
 627 {
 628         u_int32_t ulen = m->m_pkthdr.len;
 629         u_int32_t plen = sizeof(struct udphdr) + ulen;
 630         struct ip6_hdr *ip6;
 631         struct udphdr *udp6;
 632         struct in6_addr *laddr, *faddr, in6a;
 633         struct sockaddr_in6 *sin6 = NULL;
 634         struct ifnet *oifp = NULL;
 635         int cscov_partial = 0;
 636         int scope_ambiguous = 0;
 637         u_short fport;
 638         int error = 0;
 639         uint8_t nxt;
 640         uint16_t cscov = 0;
 641         struct ip6_pktopts *optp, opt;
 642         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
 643         int flags;
 644         struct sockaddr_in6 tmp;
 645
 646         INP_WLOCK_ASSERT(inp);
 647         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 648
 649         if (addr6) {
 650                 /* addr6 has been validated in udp6_send(). */
 651                 sin6 = (struct sockaddr_in6 *)addr6;
 652
 653                 /* protect *sin6 from overwrites */
 654                 tmp = *sin6;
 655                 sin6 = &tmp;
 656
 657                 /*
 658                  * Application should provide a proper zone ID or the use of
 659                  * default zone IDs should be enabled.  Unfortunately, some
 660                  * applications do not behave as it should, so we need a
 661                  * workaround.  Even if an appropriate ID is not determined,
 662                  * we'll see if we can determine the outgoing interface.  If we
 663                  * can, determine the zone ID based on the interface below.
 664                  */
 665                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
 666                         scope_ambiguous = 1;
 667                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 668                         return (error);
 669         }
 670
 671         if (control) {
 672                 if ((error = ip6_setpktopts(control, &opt,
 673                     inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
 674                         goto release;
 675                 optp = &opt;
 676         } else
 677                 optp = inp->in6p_outputopts;
 678
 679         if (sin6) {
 680                 faddr = &sin6->sin6_addr;
 681
 682                 /*
 683                  * Since we saw no essential reason for calling in_pcbconnect,
 684                  * we get rid of such kind of logic, and call in6_selectsrc
 685                  * and in6_pcbsetport in order to fill in the local address
 686                  * and the local port.
 687                  */
 688                 if (sin6->sin6_port == 0) {
 689                         error = EADDRNOTAVAIL;
 690                         goto release;
 691                 }
 692
 693                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 694                         /* how about ::ffff:0.0.0.0 case? */
 695                         error = EISCONN;
 696                         goto release;
 697                 }
 698
 699                 fport = sin6->sin6_port; /* allow 0 port */
 700
 701                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
 702                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 703                                 /*
 704                                  * I believe we should explicitly discard the
 705                                  * packet when mapped addresses are disabled,
 706                                  * rather than send the packet as an IPv6 one.
 707                                  * If we chose the latter approach, the packet
 708                                  * might be sent out on the wire based on the
 709                                  * default route, the situation which we'd
 710                                  * probably want to avoid.
 711                                  * (20010421 jinmei@kame.net)
 712                                  */
 713                                 error = EINVAL;
 714                                 goto release;
 715                         }
 716                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
 717                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
 718                                 /*
 719                                  * when remote addr is an IPv4-mapped address,
 720                                  * local addr should not be an IPv6 address,
 721                                  * since you cannot determine how to map IPv6
 722                                  * source address to IPv4.
 723                                  */
 724                                 error = EINVAL;
 725                                 goto release;
 726                         }
 727
 728                         af = AF_INET;
 729                 }
 730
 731                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
 732                         error = in6_selectsrc(sin6, optp, inp, NULL,
 733                             td->td_ucred, &oifp, &in6a);
 734                         if (error)
 735                                 goto release;
 736                         if (oifp && scope_ambiguous &&
 737                             (error = in6_setscope(&sin6->sin6_addr,
 738                             oifp, NULL))) {
 739                                 goto release;
 740                         }
 741                         laddr = &in6a;
 742                 } else
 743                         laddr = &inp->in6p_laddr;       /* XXX */
 744                 if (laddr == NULL) {
 745                         if (error == 0)
 746                                 error = EADDRNOTAVAIL;
 747                         goto release;
 748                 }
 749                 if (inp->inp_lport == 0 &&
 750                     (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
 751                         /* Undo an address bind that may have occurred. */
 752                         inp->in6p_laddr = in6addr_any;
 753                         goto release;
 754                 }
 755         } else {
 756                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 757                         error = ENOTCONN;
 758                         goto release;
 759                 }
 760                 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
 761                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 762                                 /*
 763                                  * XXX: this case would happen when the
 764                                  * application sets the V6ONLY flag after
 765                                  * connecting the foreign address.
 766                                  * Such applications should be fixed,
 767                                  * so we bark here.
 768                                  */
 769                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
 770                                     "option was set for a connected socket\n");
 771                                 error = EINVAL;
 772                                 goto release;
 773                         } else
 774                                 af = AF_INET;
 775                 }
 776                 laddr = &inp->in6p_laddr;
 777                 faddr = &inp->in6p_faddr;
 778                 fport = inp->inp_fport;
 779         }
 780
 781         if (af == AF_INET)
 782                 hlen = sizeof(struct ip);
 783
 784         /*
 785          * Calculate data length and get a mbuf
 786          * for UDP and IP6 headers.
 787          */
 788         M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
 789         if (m == 0) {
 790                 error = ENOBUFS;
 791                 goto release;
 792         }
 793
 794         /*
 795          * Stuff checksum and output datagram.
 796          */
 797         nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 798             IPPROTO_UDP : IPPROTO_UDPLITE;
 799         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
 800         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
 801         udp6->uh_dport = fport;
 802         if (nxt == IPPROTO_UDPLITE) {
 803                 struct udpcb *up;
 804
 805                 up = intoudpcb(inp);
 806                 cscov = up->u_txcslen;
 807                 if (cscov >= plen)
 808                         cscov = 0;
 809                 udp6->uh_ulen = htons(cscov);
 810                 /*
 811                  * For UDP-Lite, checksum coverage length of zero means
 812                  * the entire UDPLite packet is covered by the checksum.
 813                  */
 814                 cscov_partial = (cscov == 0) ? 0 : 1;
 815         } else if (plen <= 0xffff)
 816                 udp6->uh_ulen = htons((u_short)plen);
 817         else
 818                 udp6->uh_ulen = 0;
 819         udp6->uh_sum = 0;
 820
 821         switch (af) {
 822         case AF_INET6:
 823                 ip6 = mtod(m, struct ip6_hdr *);
 824                 ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
 825                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
 826                 ip6->ip6_vfc    |= IPV6_VERSION;
 827                 ip6->ip6_plen   = htons((u_short)plen);
 828                 ip6->ip6_nxt    = nxt;
 829                 ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
 830                 ip6->ip6_src    = *laddr;
 831                 ip6->ip6_dst    = *faddr;
 832
 833                 if (cscov_partial) {
 834                         if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
 835                             sizeof(struct ip6_hdr), plen, cscov)) == 0)
 836                                 udp6->uh_sum = 0xffff;
 837                 } else {
 838                         udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
 839                         m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
 840                         m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
 841                 }
 842
 843                 /*
 844                  * XXX for now assume UDP is 2-tuple.
 845                  * Later on this may become configurable as 4-tuple;
 846                  * we should support that.
 847                  *
 848                  * XXX .. and we should likely cache this in the inpcb.
 849                  */
 850 #ifdef  RSS
 851                 m->m_pkthdr.flowid = rss_hash_ip6_2tuple(*faddr, *laddr);
 852                 m->m_flags |= M_FLOWID;
 853                 M_HASHTYPE_SET(m, M_HASHTYPE_RSS_IPV6);
 854 #endif
 855                 flags = 0;
 856
 857 #ifdef  RSS
 858                 /*
 859                  * Don't override with the inp cached flowid.
 860                  *
 861                  * Until the whole UDP path is vetted, it may actually
 862                  * be incorrect.
 863                  */
 864                 flags |= IP_NODEFAULTFLOWID;
 865 #endif
 866
 867                 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
 868                 UDPSTAT_INC(udps_opackets);
 869                 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
 870                     NULL, inp);
 871                 break;
 872         case AF_INET:
 873                 error = EAFNOSUPPORT;
 874                 goto release;
 875         }
 876         goto releaseopt;
 877
 878 release:
 879         m_freem(m);
 880
 881 releaseopt:
 882         if (control) {
 883                 ip6_clearpktopts(&opt, -1);
 884                 m_freem(control);
 885         }
 886         return (error);
 887 }
 888
 889 static void
 890 udp6_abort(struct socket *so)
 891 {
 892         struct inpcb *inp;
 893         struct inpcbinfo *pcbinfo;
 894
 895         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
 896         inp = sotoinpcb(so);
 897         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
 898
 899 #ifdef INET
 900         if (inp->inp_vflag & INP_IPV4) {
 901                 struct pr_usrreqs *pru;
 902
 903                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 904                 (*pru->pru_abort)(so);
 905                 return;
 906         }
 907 #endif
 908
 909         INP_WLOCK(inp);
 910         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 911                 INP_HASH_WLOCK(pcbinfo);
 912                 in6_pcbdisconnect(inp);
 913                 inp->in6p_laddr = in6addr_any;
 914                 INP_HASH_WUNLOCK(pcbinfo);
 915                 soisdisconnected(so);
 916         }
 917         INP_WUNLOCK(inp);
 918 }
 919
 920 static int
 921 udp6_attach(struct socket *so, int proto, struct thread *td)
 922 {
 923         struct inpcb *inp;
 924         struct inpcbinfo *pcbinfo;
 925         int error;
 926
 927         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
 928         inp = sotoinpcb(so);
 929         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
 930
 931         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 932                 error = soreserve(so, udp_sendspace, udp_recvspace);
 933                 if (error)
 934                         return (error);
 935         }
 936         INP_INFO_WLOCK(pcbinfo);
 937         error = in_pcballoc(so, pcbinfo);
 938         if (error) {
 939                 INP_INFO_WUNLOCK(pcbinfo);
 940                 return (error);
 941         }
 942         inp = (struct inpcb *)so->so_pcb;
 943         inp->inp_vflag |= INP_IPV6;
 944         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 945                 inp->inp_vflag |= INP_IPV4;
 946         inp->in6p_hops = -1;    /* use kernel default */
 947         inp->in6p_cksum = -1;   /* just to be sure */
 948         /*
 949          * XXX: ugly!!
 950          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 951          * because the socket may be bound to an IPv6 wildcard address,
 952          * which may match an IPv4-mapped IPv6 address.
 953          */
 954         inp->inp_ip_ttl = V_ip_defttl;
 955
 956         error = udp_newudpcb(inp);
 957         if (error) {
 958                 in_pcbdetach(inp);
 959                 in_pcbfree(inp);
 960                 INP_INFO_WUNLOCK(pcbinfo);
 961                 return (error);
 962         }
 963         INP_WUNLOCK(inp);
 964         INP_INFO_WUNLOCK(pcbinfo);
 965         return (0);
 966 }
 967
 968 static int
 969 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 970 {
 971         struct inpcb *inp;
 972         struct inpcbinfo *pcbinfo;
 973         int error;
 974
 975         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
 976         inp = sotoinpcb(so);
 977         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
 978
 979         INP_WLOCK(inp);
 980         INP_HASH_WLOCK(pcbinfo);
 981         inp->inp_vflag &= ~INP_IPV4;
 982         inp->inp_vflag |= INP_IPV6;
 983         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 984                 struct sockaddr_in6 *sin6_p;
 985
 986                 sin6_p = (struct sockaddr_in6 *)nam;
 987
 988                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 989                         inp->inp_vflag |= INP_IPV4;
 990 #ifdef INET
 991                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 992                         struct sockaddr_in sin;
 993
 994                         in6_sin6_2_sin(&sin, sin6_p);
 995                         inp->inp_vflag |= INP_IPV4;
 996                         inp->inp_vflag &= ~INP_IPV6;
 997                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 998                             td->td_ucred);
 999                         goto out;
1000                 }
1001 #endif
1002         }
1003
1004         error = in6_pcbbind(inp, nam, td->td_ucred);
1005 #ifdef INET
1006 out:
1007 #endif
1008         INP_HASH_WUNLOCK(pcbinfo);
1009         INP_WUNLOCK(inp);
1010         return (error);
1011 }
1012
1013 static void
1014 udp6_close(struct socket *so)
1015 {
1016         struct inpcb *inp;
1017         struct inpcbinfo *pcbinfo;
1018
1019         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1020         inp = sotoinpcb(so);
1021         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1022
1023 #ifdef INET
1024         if (inp->inp_vflag & INP_IPV4) {
1025                 struct pr_usrreqs *pru;
1026
1027                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1028                 (*pru->pru_disconnect)(so);
1029                 return;
1030         }
1031 #endif
1032         INP_WLOCK(inp);
1033         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1034                 INP_HASH_WLOCK(pcbinfo);
1035                 in6_pcbdisconnect(inp);
1036                 inp->in6p_laddr = in6addr_any;
1037                 INP_HASH_WUNLOCK(pcbinfo);
1038                 soisdisconnected(so);
1039         }
1040         INP_WUNLOCK(inp);
1041 }
1042
1043 static int
1044 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1045 {
1046         struct inpcb *inp;
1047         struct inpcbinfo *pcbinfo;
1048         struct sockaddr_in6 *sin6;
1049         int error;
1050
1051         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1052         inp = sotoinpcb(so);
1053         sin6 = (struct sockaddr_in6 *)nam;
1054         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1055
1056         /*
1057          * XXXRW: Need to clarify locking of v4/v6 flags.
1058          */
1059         INP_WLOCK(inp);
1060 #ifdef INET
1061         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1062                 struct sockaddr_in sin;
1063
1064                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1065                         error = EINVAL;
1066                         goto out;
1067                 }
1068                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1069                         error = EISCONN;
1070                         goto out;
1071                 }
1072                 in6_sin6_2_sin(&sin, sin6);
1073                 inp->inp_vflag |= INP_IPV4;
1074                 inp->inp_vflag &= ~INP_IPV6;
1075                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1076                 if (error != 0)
1077                         goto out;
1078                 INP_HASH_WLOCK(pcbinfo);
1079                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1080                     td->td_ucred);
1081                 INP_HASH_WUNLOCK(pcbinfo);
1082                 if (error == 0)
1083                         soisconnected(so);
1084                 goto out;
1085         }
1086 #endif
1087         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1088                 error = EISCONN;
1089                 goto out;
1090         }
1091         inp->inp_vflag &= ~INP_IPV4;
1092         inp->inp_vflag |= INP_IPV6;
1093         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1094         if (error != 0)
1095                 goto out;
1096         INP_HASH_WLOCK(pcbinfo);
1097         error = in6_pcbconnect(inp, nam, td->td_ucred);
1098         INP_HASH_WUNLOCK(pcbinfo);
1099         if (error == 0)
1100                 soisconnected(so);
1101 out:
1102         INP_WUNLOCK(inp);
1103         return (error);
1104 }
1105
1106 static void
1107 udp6_detach(struct socket *so)
1108 {
1109         struct inpcb *inp;
1110         struct inpcbinfo *pcbinfo;
1111         struct udpcb *up;
1112
1113         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1114         inp = sotoinpcb(so);
1115         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1116
1117         INP_INFO_WLOCK(pcbinfo);
1118         INP_WLOCK(inp);
1119         up = intoudpcb(inp);
1120         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1121         in_pcbdetach(inp);
1122         in_pcbfree(inp);
1123         INP_INFO_WUNLOCK(pcbinfo);
1124         udp_discardcb(up);
1125 }
1126
1127 static int
1128 udp6_disconnect(struct socket *so)
1129 {
1130         struct inpcb *inp;
1131         struct inpcbinfo *pcbinfo;
1132         int error;
1133
1134         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1135         inp = sotoinpcb(so);
1136         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1137
1138 #ifdef INET
1139         if (inp->inp_vflag & INP_IPV4) {
1140                 struct pr_usrreqs *pru;
1141
1142                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1143                 (void)(*pru->pru_disconnect)(so);
1144                 return (0);
1145         }
1146 #endif
1147
1148         INP_WLOCK(inp);
1149
1150         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1151                 error = ENOTCONN;
1152                 goto out;
1153         }
1154
1155         INP_HASH_WLOCK(pcbinfo);
1156         in6_pcbdisconnect(inp);
1157         inp->in6p_laddr = in6addr_any;
1158         INP_HASH_WUNLOCK(pcbinfo);
1159         SOCK_LOCK(so);
1160         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1161         SOCK_UNLOCK(so);
1162 out:
1163         INP_WUNLOCK(inp);
1164         return (0);
1165 }
1166
1167 static int
1168 udp6_send(struct socket *so, int flags, struct mbuf *m,
1169     struct sockaddr *addr, struct mbuf *control, struct thread *td)
1170 {
1171         struct inpcb *inp;
1172         struct inpcbinfo *pcbinfo;
1173         int error = 0;
1174
1175         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1176         inp = sotoinpcb(so);
1177         KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1178
1179         INP_WLOCK(inp);
1180         if (addr) {
1181                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1182                         error = EINVAL;
1183                         goto bad;
1184                 }
1185                 if (addr->sa_family != AF_INET6) {
1186                         error = EAFNOSUPPORT;
1187                         goto bad;
1188                 }
1189         }
1190
1191 #ifdef INET
1192         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1193                 int hasv4addr;
1194                 struct sockaddr_in6 *sin6 = 0;
1195
1196                 if (addr == 0)
1197                         hasv4addr = (inp->inp_vflag & INP_IPV4);
1198                 else {
1199                         sin6 = (struct sockaddr_in6 *)addr;
1200                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1201                             ? 1 : 0;
1202                 }
1203                 if (hasv4addr) {
1204                         struct pr_usrreqs *pru;
1205
1206                         /*
1207                          * XXXRW: We release UDP-layer locks before calling
1208                          * udp_send() in order to avoid recursion.  However,
1209                          * this does mean there is a short window where inp's
1210                          * fields are unstable.  Could this lead to a
1211                          * potential race in which the factors causing us to
1212                          * select the UDPv4 output routine are invalidated?
1213                          */
1214                         INP_WUNLOCK(inp);
1215                         if (sin6)
1216                                 in6_sin6_2_sin_in_sock(addr);
1217                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1218                         /* addr will just be freed in sendit(). */
1219                         return ((*pru->pru_send)(so, flags, m, addr, control,
1220                             td));
1221                 }
1222         }
1223 #endif
1224 #ifdef MAC
1225         mac_inpcb_create_mbuf(inp, m);
1226 #endif
1227         INP_HASH_WLOCK(pcbinfo);
1228         error = udp6_output(inp, m, addr, control, td);
1229         INP_HASH_WUNLOCK(pcbinfo);
1230 #ifdef INET
1231 #endif
1232         INP_WUNLOCK(inp);
1233         return (error);
1234
1235 bad:
1236         INP_WUNLOCK(inp);
1237         m_freem(m);
1238         return (error);
1239 }
1240
1241 struct pr_usrreqs udp6_usrreqs = {
1242         .pru_abort =            udp6_abort,
1243         .pru_attach =           udp6_attach,
1244         .pru_bind =             udp6_bind,
1245         .pru_connect =          udp6_connect,
1246         .pru_control =          in6_control,
1247         .pru_detach =           udp6_detach,
1248         .pru_disconnect =       udp6_disconnect,
1249         .pru_peeraddr =         in6_mapped_peeraddr,
1250         .pru_send =             udp6_send,
1251         .pru_shutdown =         udp_shutdown,
1252         .pru_sockaddr =         in6_mapped_sockaddr,
1253         .pru_soreceive =        soreceive_dgram,
1254         .pru_sosend =           sosend_dgram,
1255         .pru_sosetlabel =       in_pcbsosetlabel,
1256         .pru_close =            udp6_close
1257 };