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_ipsec.h"
  76 #include "opt_rss.h"
  77
  78 #include <sys/param.h>
  79 #include <sys/jail.h>
  80 #include <sys/kernel.h>
  81 #include <sys/lock.h>
  82 #include <sys/mbuf.h>
  83 #include <sys/priv.h>
  84 #include <sys/proc.h>
  85 #include <sys/protosw.h>
  86 #include <sys/sdt.h>
  87 #include <sys/signalvar.h>
  88 #include <sys/socket.h>
  89 #include <sys/socketvar.h>
  90 #include <sys/sx.h>
  91 #include <sys/sysctl.h>
  92 #include <sys/syslog.h>
  93 #include <sys/systm.h>
  94
  95 #include <net/if.h>
  96 #include <net/if_var.h>
  97 #include <net/if_types.h>
  98 #include <net/route.h>
  99 #include <net/rss_config.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/ip6.h>
 108 #include <netinet/icmp6.h>
 109 #include <netinet/ip_var.h>
 110 #include <netinet/udp.h>
 111 #include <netinet/udp_var.h>
 112 #include <netinet/udplite.h>
 113
 114 #include <netinet6/ip6protosw.h>
 115 #include <netinet6/ip6_var.h>
 116 #include <netinet6/in6_pcb.h>
 117 #include <netinet6/in6_rss.h>
 118 #include <netinet6/udp6_var.h>
 119 #include <netinet6/scope6_var.h>
 120
 121 #include <netipsec/ipsec_support.h>
 122
 123 #include <security/mac/mac_framework.h>
 124
 125 /*
 126  * UDP protocol implementation.
 127  * Per RFC 768, August, 1980.
 128  */
 129
 130 extern struct protosw   inetsw[];
 131 static void             udp6_detach(struct socket *so);
 132
 133 static int
 134 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
 135     struct sockaddr_in6 *fromsa)
 136 {
 137         struct socket *so;
 138         struct mbuf *opts;
 139         struct udpcb *up;
 140
 141         INP_LOCK_ASSERT(inp);
 142
 143         /*
 144          * Engage the tunneling protocol.
 145          */
 146         up = intoudpcb(inp);
 147         if (up->u_tun_func != NULL) {
 148                 in_pcbref(inp);
 149                 INP_RUNLOCK(inp);
 150                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa,
 151                     up->u_tun_ctx);
 152                 INP_RLOCK(inp);
 153                 return (in_pcbrele_rlocked(inp));
 154         }
 155 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 156         /* Check AH/ESP integrity. */
 157         if (IPSEC_ENABLED(ipv6)) {
 158                 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) {
 159                         m_freem(n);
 160                         return (0);
 161                 }
 162         }
 163 #endif /* IPSEC */
 164 #ifdef MAC
 165         if (mac_inpcb_check_deliver(inp, n) != 0) {
 166                 m_freem(n);
 167                 return (0);
 168         }
 169 #endif
 170         opts = NULL;
 171         if (inp->inp_flags & INP_CONTROLOPTS ||
 172             inp->inp_socket->so_options & SO_TIMESTAMP)
 173                 ip6_savecontrol(inp, n, &opts);
 174         m_adj(n, off + sizeof(struct udphdr));
 175
 176         so = inp->inp_socket;
 177         SOCKBUF_LOCK(&so->so_rcv);
 178         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
 179             opts) == 0) {
 180                 SOCKBUF_UNLOCK(&so->so_rcv);
 181                 m_freem(n);
 182                 if (opts)
 183                         m_freem(opts);
 184                 UDPSTAT_INC(udps_fullsock);
 185         } else
 186                 sorwakeup_locked(so);
 187         return (0);
 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
 210 #ifndef PULLDOWN_TEST
 211         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 212         ip6 = mtod(m, struct ip6_hdr *);
 213         uh = (struct udphdr *)((caddr_t)ip6 + off);
 214 #else
 215         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
 216         if (!uh)
 217                 return (IPPROTO_DONE);
 218         ip6 = mtod(m, struct ip6_hdr *);
 219 #endif
 220
 221         UDPSTAT_INC(udps_ipackets);
 222
 223         /*
 224          * Destination port of 0 is illegal, based on RFC768.
 225          */
 226         if (uh->uh_dport == 0)
 227                 goto badunlocked;
 228
 229         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 230         ulen = ntohs((u_short)uh->uh_ulen);
 231
 232         nxt = proto;
 233         cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
 234         if (nxt == IPPROTO_UDPLITE) {
 235                 /* Zero means checksum over the complete packet. */
 236                 if (ulen == 0)
 237                         ulen = plen;
 238                 if (ulen == plen)
 239                         cscov_partial = 0;
 240                 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
 241                         /* XXX: What is the right UDPLite MIB counter? */
 242                         goto badunlocked;
 243                 }
 244                 if (uh->uh_sum == 0) {
 245                         /* XXX: What is the right UDPLite MIB counter? */
 246                         goto badunlocked;
 247                 }
 248         } else {
 249                 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
 250                         UDPSTAT_INC(udps_badlen);
 251                         goto badunlocked;
 252                 }
 253                 if (uh->uh_sum == 0) {
 254                         UDPSTAT_INC(udps_nosum);
 255                         goto badunlocked;
 256                 }
 257         }
 258
 259         if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
 260             !cscov_partial) {
 261                 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 262                         uh_sum = m->m_pkthdr.csum_data;
 263                 else
 264                         uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
 265                             m->m_pkthdr.csum_data);
 266                 uh_sum ^= 0xffff;
 267         } else
 268                 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
 269
 270         if (uh_sum != 0) {
 271                 UDPSTAT_INC(udps_badsum);
 272                 goto badunlocked;
 273         }
 274
 275         /*
 276          * Construct sockaddr format source address.
 277          */
 278         init_sin6(&fromsa, m);
 279         fromsa.sin6_port = uh->uh_sport;
 280
 281         pcbinfo = udp_get_inpcbinfo(nxt);
 282         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 283                 struct inpcb *last;
 284                 struct inpcbhead *pcblist;
 285                 struct ip6_moptions *imo;
 286
 287                 INP_INFO_RLOCK(pcbinfo);
 288                 /*
 289                  * In the event that laddr should be set to the link-local
 290                  * address (this happens in RIPng), the multicast address
 291                  * specified in the received packet will not match laddr.  To
 292                  * handle this situation, matching is relaxed if the
 293                  * receiving interface is the same as one specified in the
 294                  * socket and if the destination multicast address matches
 295                  * one of the multicast groups specified in the socket.
 296                  */
 297
 298                 /*
 299                  * KAME note: traditionally we dropped udpiphdr from mbuf
 300                  * here.  We need udphdr for IPsec processing so we do that
 301                  * later.
 302                  */
 303                 pcblist = udp_get_pcblist(nxt);
 304                 last = NULL;
 305                 LIST_FOREACH(inp, pcblist, inp_list) {
 306                         if ((inp->inp_vflag & INP_IPV6) == 0)
 307                                 continue;
 308                         if (inp->inp_lport != uh->uh_dport)
 309                                 continue;
 310                         if (inp->inp_fport != 0 &&
 311                             inp->inp_fport != uh->uh_sport)
 312                                 continue;
 313                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 314                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 315                                                         &ip6->ip6_dst))
 316                                         continue;
 317                         }
 318                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 319                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 320                                                         &ip6->ip6_src) ||
 321                                     inp->inp_fport != uh->uh_sport)
 322                                         continue;
 323                         }
 324
 325                         /*
 326                          * XXXRW: Because we weren't holding either the inpcb
 327                          * or the hash lock when we checked for a match
 328                          * before, we should probably recheck now that the
 329                          * inpcb lock is (supposed to be) held.
 330                          */
 331
 332                         /*
 333                          * Handle socket delivery policy for any-source
 334                          * and source-specific multicast. [RFC3678]
 335                          */
 336                         imo = inp->in6p_moptions;
 337                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 338                                 struct sockaddr_in6      mcaddr;
 339                                 int                      blocked;
 340
 341                                 INP_RLOCK(inp);
 342
 343                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
 344                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
 345                                 mcaddr.sin6_family = AF_INET6;
 346                                 mcaddr.sin6_addr = ip6->ip6_dst;
 347
 348                                 blocked = im6o_mc_filter(imo, ifp,
 349                                         (struct sockaddr *)&mcaddr,
 350                                         (struct sockaddr *)&fromsa);
 351                                 if (blocked != MCAST_PASS) {
 352                                         if (blocked == MCAST_NOTGMEMBER)
 353                                                 IP6STAT_INC(ip6s_notmember);
 354                                         if (blocked == MCAST_NOTSMEMBER ||
 355                                             blocked == MCAST_MUTED)
 356                                                 UDPSTAT_INC(udps_filtermcast);
 357                                         INP_RUNLOCK(inp); /* XXX */
 358                                         continue;
 359                                 }
 360
 361                                 INP_RUNLOCK(inp);
 362                         }
 363                         if (last != NULL) {
 364                                 struct mbuf *n;
 365
 366                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 367                                         INP_RLOCK(last);
 368                                         UDP_PROBE(receive, NULL, last, ip6,
 369                                             last, uh);
 370                                         if (udp6_append(last, n, off, &fromsa))
 371                                                 goto inp_lost;
 372                                         INP_RUNLOCK(last);
 373                                 }
 374                         }
 375                         last = inp;
 376                         /*
 377                          * Don't look for additional matches if this one does
 378                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 379                          * socket options set.  This heuristic avoids
 380                          * searching through all pcbs in the common case of a
 381                          * non-shared port.  It assumes that an application
 382                          * will never clear these options after setting them.
 383                          */
 384                         if ((last->inp_socket->so_options &
 385                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 386                                 break;
 387                 }
 388
 389                 if (last == NULL) {
 390                         /*
 391                          * No matching pcb found; discard datagram.  (No need
 392                          * to send an ICMP Port Unreachable for a broadcast
 393                          * or multicast datgram.)
 394                          */
 395                         UDPSTAT_INC(udps_noport);
 396                         UDPSTAT_INC(udps_noportmcast);
 397                         goto badheadlocked;
 398                 }
 399                 INP_RLOCK(last);
 400                 INP_INFO_RUNLOCK(pcbinfo);
 401                 UDP_PROBE(receive, NULL, last, ip6, last, uh);
 402                 if (udp6_append(last, m, off, &fromsa) == 0)
 403                         INP_RUNLOCK(last);
 404         inp_lost:
 405                 return (IPPROTO_DONE);
 406         }
 407         /*
 408          * Locate pcb for datagram.
 409          */
 410
 411         /*
 412          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 413          */
 414         if ((m->m_flags & M_IP6_NEXTHOP) &&
 415             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 416                 struct sockaddr_in6 *next_hop6;
 417
 418                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
 419
 420                 /*
 421                  * Transparently forwarded. Pretend to be the destination.
 422                  * Already got one like this?
 423                  */
 424                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 425                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 426                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
 427                 if (!inp) {
 428                         /*
 429                          * It's new.  Try to find the ambushing socket.
 430                          * Because we've rewritten the destination address,
 431                          * any hardware-generated hash is ignored.
 432                          */
 433                         inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
 434                             uh->uh_sport, &next_hop6->sin6_addr,
 435                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
 436                             uh->uh_dport, INPLOOKUP_WILDCARD |
 437                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
 438                 }
 439                 /* Remove the tag from the packet. We don't need it anymore. */
 440                 m_tag_delete(m, fwd_tag);
 441                 m->m_flags &= ~M_IP6_NEXTHOP;
 442         } else
 443                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 444                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 445                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 446                     m->m_pkthdr.rcvif, m);
 447         if (inp == NULL) {
 448                 if (udp_log_in_vain) {
 449                         char ip6bufs[INET6_ADDRSTRLEN];
 450                         char ip6bufd[INET6_ADDRSTRLEN];
 451
 452                         log(LOG_INFO,
 453                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 454                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 455                             ntohs(uh->uh_dport),
 456                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 457                             ntohs(uh->uh_sport));
 458                 }
 459                 UDPSTAT_INC(udps_noport);
 460                 if (m->m_flags & M_MCAST) {
 461                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 462                         UDPSTAT_INC(udps_noportmcast);
 463                         goto badunlocked;
 464                 }
 465                 if (V_udp_blackhole)
 466                         goto badunlocked;
 467                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 468                 return (IPPROTO_DONE);
 469         }
 470         INP_RLOCK_ASSERT(inp);
 471         up = intoudpcb(inp);
 472         if (cscov_partial) {
 473                 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
 474                         INP_RUNLOCK(inp);
 475                         m_freem(m);
 476                         return (IPPROTO_DONE);
 477                 }
 478         }
 479         UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
 480         if (udp6_append(inp, m, off, &fromsa) == 0)
 481                 INP_RUNLOCK(inp);
 482         return (IPPROTO_DONE);
 483
 484 badheadlocked:
 485         INP_INFO_RUNLOCK(pcbinfo);
 486 badunlocked:
 487         if (m)
 488                 m_freem(m);
 489         return (IPPROTO_DONE);
 490 }
 491
 492 static void
 493 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
 494     struct inpcbinfo *pcbinfo)
 495 {
 496         struct udphdr uh;
 497         struct ip6_hdr *ip6;
 498         struct mbuf *m;
 499         int off = 0;
 500         struct ip6ctlparam *ip6cp = NULL;
 501         const struct sockaddr_in6 *sa6_src = NULL;
 502         void *cmdarg;
 503         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
 504         struct udp_portonly {
 505                 u_int16_t uh_sport;
 506                 u_int16_t uh_dport;
 507         } *uhp;
 508
 509         if (sa->sa_family != AF_INET6 ||
 510             sa->sa_len != sizeof(struct sockaddr_in6))
 511                 return;
 512
 513         if ((unsigned)cmd >= PRC_NCMDS)
 514                 return;
 515         if (PRC_IS_REDIRECT(cmd))
 516                 notify = in6_rtchange, d = NULL;
 517         else if (cmd == PRC_HOSTDEAD)
 518                 d = NULL;
 519         else if (inet6ctlerrmap[cmd] == 0)
 520                 return;
 521
 522         /* if the parameter is from icmp6, decode it. */
 523         if (d != NULL) {
 524                 ip6cp = (struct ip6ctlparam *)d;
 525                 m = ip6cp->ip6c_m;
 526                 ip6 = ip6cp->ip6c_ip6;
 527                 off = ip6cp->ip6c_off;
 528                 cmdarg = ip6cp->ip6c_cmdarg;
 529                 sa6_src = ip6cp->ip6c_src;
 530         } else {
 531                 m = NULL;
 532                 ip6 = NULL;
 533                 cmdarg = NULL;
 534                 sa6_src = &sa6_any;
 535         }
 536
 537         if (ip6) {
 538                 /*
 539                  * XXX: We assume that when IPV6 is non NULL,
 540                  * M and OFF are valid.
 541                  */
 542
 543                 /* Check if we can safely examine src and dst ports. */
 544                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 545                         return;
 546
 547                 bzero(&uh, sizeof(uh));
 548                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 549
 550                 if (!PRC_IS_REDIRECT(cmd)) {
 551                         /* Check to see if its tunneled */
 552                         struct inpcb *inp;
 553                         inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
 554                             uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
 555                             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 556                             m->m_pkthdr.rcvif, m);
 557                         if (inp != NULL) {
 558                                 struct udpcb *up;
 559
 560                                 up = intoudpcb(inp);
 561                                 if (up->u_icmp_func) {
 562                                         /* Yes it is. */
 563                                         INP_RUNLOCK(inp);
 564                                         (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
 565                                               d, up->u_tun_ctx);
 566                                         return;
 567                                 } else {
 568                                         /* Can't find it. */
 569                                         INP_RUNLOCK(inp);
 570                                 }
 571                         }
 572                 }
 573                 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
 574                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
 575                     cmdarg, notify);
 576         } else
 577                 (void)in6_pcbnotify(pcbinfo, sa, 0,
 578                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
 579 }
 580
 581 void
 582 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 583 {
 584
 585         return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
 586 }
 587
 588 void
 589 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 590 {
 591
 592         return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
 593 }
 594
 595 static int
 596 udp6_getcred(SYSCTL_HANDLER_ARGS)
 597 {
 598         struct xucred xuc;
 599         struct sockaddr_in6 addrs[2];
 600         struct inpcb *inp;
 601         int error;
 602
 603         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 604         if (error)
 605                 return (error);
 606
 607         if (req->newlen != sizeof(addrs))
 608                 return (EINVAL);
 609         if (req->oldlen != sizeof(struct xucred))
 610                 return (EINVAL);
 611         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 612         if (error)
 613                 return (error);
 614         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
 615             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
 616                 return (error);
 617         }
 618         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
 619             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
 620             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 621         if (inp != NULL) {
 622                 INP_RLOCK_ASSERT(inp);
 623                 if (inp->inp_socket == NULL)
 624                         error = ENOENT;
 625                 if (error == 0)
 626                         error = cr_canseesocket(req->td->td_ucred,
 627                             inp->inp_socket);
 628                 if (error == 0)
 629                         cru2x(inp->inp_cred, &xuc);
 630                 INP_RUNLOCK(inp);
 631         } else
 632                 error = ENOENT;
 633         if (error == 0)
 634                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 635         return (error);
 636 }
 637
 638 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
 639     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
 640
 641 static int
 642 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
 643     struct mbuf *control, struct thread *td)
 644 {
 645         u_int32_t ulen = m->m_pkthdr.len;
 646         u_int32_t plen = sizeof(struct udphdr) + ulen;
 647         struct ip6_hdr *ip6;
 648         struct udphdr *udp6;
 649         struct in6_addr *laddr, *faddr, in6a;
 650         struct sockaddr_in6 *sin6 = NULL;
 651         int cscov_partial = 0;
 652         int scope_ambiguous = 0;
 653         u_short fport;
 654         int error = 0;
 655         uint8_t nxt;
 656         uint16_t cscov = 0;
 657         struct ip6_pktopts *optp, opt;
 658         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
 659         int flags;
 660         struct sockaddr_in6 tmp;
 661
 662         INP_WLOCK_ASSERT(inp);
 663         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 664
 665         if (addr6) {
 666                 /* addr6 has been validated in udp6_send(). */
 667                 sin6 = (struct sockaddr_in6 *)addr6;
 668
 669                 /* protect *sin6 from overwrites */
 670                 tmp = *sin6;
 671                 sin6 = &tmp;
 672
 673                 /*
 674                  * Application should provide a proper zone ID or the use of
 675                  * default zone IDs should be enabled.  Unfortunately, some
 676                  * applications do not behave as it should, so we need a
 677                  * workaround.  Even if an appropriate ID is not determined,
 678                  * we'll see if we can determine the outgoing interface.  If we
 679                  * can, determine the zone ID based on the interface below.
 680                  */
 681                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
 682                         scope_ambiguous = 1;
 683                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 684                         return (error);
 685         }
 686
 687         nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 688             IPPROTO_UDP : IPPROTO_UDPLITE;
 689         if (control) {
 690                 if ((error = ip6_setpktopts(control, &opt,
 691                     inp->in6p_outputopts, td->td_ucred, nxt)) != 0)
 692                         goto release;
 693                 optp = &opt;
 694         } else
 695                 optp = inp->in6p_outputopts;
 696
 697         if (sin6) {
 698                 faddr = &sin6->sin6_addr;
 699
 700                 /*
 701                  * Since we saw no essential reason for calling in_pcbconnect,
 702                  * we get rid of such kind of logic, and call in6_selectsrc
 703                  * and in6_pcbsetport in order to fill in the local address
 704                  * and the local port.
 705                  */
 706                 if (sin6->sin6_port == 0) {
 707                         error = EADDRNOTAVAIL;
 708                         goto release;
 709                 }
 710
 711                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 712                         /* how about ::ffff:0.0.0.0 case? */
 713                         error = EISCONN;
 714                         goto release;
 715                 }
 716
 717                 fport = sin6->sin6_port; /* allow 0 port */
 718
 719                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
 720                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 721                                 /*
 722                                  * I believe we should explicitly discard the
 723                                  * packet when mapped addresses are disabled,
 724                                  * rather than send the packet as an IPv6 one.
 725                                  * If we chose the latter approach, the packet
 726                                  * might be sent out on the wire based on the
 727                                  * default route, the situation which we'd
 728                                  * probably want to avoid.
 729                                  * (20010421 jinmei@kame.net)
 730                                  */
 731                                 error = EINVAL;
 732                                 goto release;
 733                         }
 734                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
 735                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
 736                                 /*
 737                                  * when remote addr is an IPv4-mapped address,
 738                                  * local addr should not be an IPv6 address,
 739                                  * since you cannot determine how to map IPv6
 740                                  * source address to IPv4.
 741                                  */
 742                                 error = EINVAL;
 743                                 goto release;
 744                         }
 745
 746                         af = AF_INET;
 747                 }
 748
 749                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
 750                         error = in6_selectsrc_socket(sin6, optp, inp,
 751                             td->td_ucred, scope_ambiguous, &in6a, NULL);
 752                         if (error)
 753                                 goto release;
 754                         laddr = &in6a;
 755                 } else
 756                         laddr = &inp->in6p_laddr;       /* XXX */
 757                 if (laddr == NULL) {
 758                         if (error == 0)
 759                                 error = EADDRNOTAVAIL;
 760                         goto release;
 761                 }
 762                 if (inp->inp_lport == 0 &&
 763                     (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
 764                         /* Undo an address bind that may have occurred. */
 765                         inp->in6p_laddr = in6addr_any;
 766                         goto release;
 767                 }
 768         } else {
 769                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 770                         error = ENOTCONN;
 771                         goto release;
 772                 }
 773                 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
 774                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 775                                 /*
 776                                  * XXX: this case would happen when the
 777                                  * application sets the V6ONLY flag after
 778                                  * connecting the foreign address.
 779                                  * Such applications should be fixed,
 780                                  * so we bark here.
 781                                  */
 782                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
 783                                     "option was set for a connected socket\n");
 784                                 error = EINVAL;
 785                                 goto release;
 786                         } else
 787                                 af = AF_INET;
 788                 }
 789                 laddr = &inp->in6p_laddr;
 790                 faddr = &inp->in6p_faddr;
 791                 fport = inp->inp_fport;
 792         }
 793
 794         if (af == AF_INET)
 795                 hlen = sizeof(struct ip);
 796
 797         /*
 798          * Calculate data length and get a mbuf
 799          * for UDP and IP6 headers.
 800          */
 801         M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
 802         if (m == NULL) {
 803                 error = ENOBUFS;
 804                 goto release;
 805         }
 806
 807         /*
 808          * Stuff checksum and output datagram.
 809          */
 810         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
 811         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
 812         udp6->uh_dport = fport;
 813         if (nxt == IPPROTO_UDPLITE) {
 814                 struct udpcb *up;
 815
 816                 up = intoudpcb(inp);
 817                 cscov = up->u_txcslen;
 818                 if (cscov >= plen)
 819                         cscov = 0;
 820                 udp6->uh_ulen = htons(cscov);
 821                 /*
 822                  * For UDP-Lite, checksum coverage length of zero means
 823                  * the entire UDPLite packet is covered by the checksum.
 824                  */
 825                 cscov_partial = (cscov == 0) ? 0 : 1;
 826         } else if (plen <= 0xffff)
 827                 udp6->uh_ulen = htons((u_short)plen);
 828         else
 829                 udp6->uh_ulen = 0;
 830         udp6->uh_sum = 0;
 831
 832         switch (af) {
 833         case AF_INET6:
 834                 ip6 = mtod(m, struct ip6_hdr *);
 835                 ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
 836                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
 837                 ip6->ip6_vfc    |= IPV6_VERSION;
 838                 ip6->ip6_plen   = htons((u_short)plen);
 839                 ip6->ip6_nxt    = nxt;
 840                 ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
 841                 ip6->ip6_src    = *laddr;
 842                 ip6->ip6_dst    = *faddr;
 843
 844                 if (cscov_partial) {
 845                         if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
 846                             sizeof(struct ip6_hdr), plen, cscov)) == 0)
 847                                 udp6->uh_sum = 0xffff;
 848                 } else {
 849                         udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
 850                         m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
 851                         m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
 852                 }
 853
 854 #ifdef  RSS
 855                 {
 856                         uint32_t hash_val, hash_type;
 857                         uint8_t pr;
 858
 859                         pr = inp->inp_socket->so_proto->pr_protocol;
 860                         /*
 861                          * Calculate an appropriate RSS hash for UDP and
 862                          * UDP Lite.
 863                          *
 864                          * The called function will take care of figuring out
 865                          * whether a 2-tuple or 4-tuple hash is required based
 866                          * on the currently configured scheme.
 867                          *
 868                          * Later later on connected socket values should be
 869                          * cached in the inpcb and reused, rather than constantly
 870                          * re-calculating it.
 871                          *
 872                          * UDP Lite is a different protocol number and will
 873                          * likely end up being hashed as a 2-tuple until
 874                          * RSS / NICs grow UDP Lite protocol awareness.
 875                          */
 876                         if (rss_proto_software_hash_v6(faddr, laddr, fport,
 877                             inp->inp_lport, pr, &hash_val, &hash_type) == 0) {
 878                                 m->m_pkthdr.flowid = hash_val;
 879                                 M_HASHTYPE_SET(m, hash_type);
 880                         }
 881                 }
 882 #endif
 883                 flags = 0;
 884 #ifdef  RSS
 885                 /*
 886                  * Don't override with the inp cached flowid.
 887                  *
 888                  * Until the whole UDP path is vetted, it may actually
 889                  * be incorrect.
 890                  */
 891                 flags |= IP_NODEFAULTFLOWID;
 892 #endif
 893
 894                 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
 895                 UDPSTAT_INC(udps_opackets);
 896                 error = ip6_output(m, optp, &inp->inp_route6, flags,
 897                     inp->in6p_moptions, NULL, inp);
 898                 break;
 899         case AF_INET:
 900                 error = EAFNOSUPPORT;
 901                 goto release;
 902         }
 903         goto releaseopt;
 904
 905 release:
 906         m_freem(m);
 907
 908 releaseopt:
 909         if (control) {
 910                 ip6_clearpktopts(&opt, -1);
 911                 m_freem(control);
 912         }
 913         return (error);
 914 }
 915
 916 static void
 917 udp6_abort(struct socket *so)
 918 {
 919         struct inpcb *inp;
 920         struct inpcbinfo *pcbinfo;
 921
 922         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 923         inp = sotoinpcb(so);
 924         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
 925
 926         INP_WLOCK(inp);
 927 #ifdef INET
 928         if (inp->inp_vflag & INP_IPV4) {
 929                 struct pr_usrreqs *pru;
 930                 uint8_t nxt;
 931
 932                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 933                     IPPROTO_UDP : IPPROTO_UDPLITE;
 934                 INP_WUNLOCK(inp);
 935                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
 936                 (*pru->pru_abort)(so);
 937                 return;
 938         }
 939 #endif
 940
 941         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 942                 INP_HASH_WLOCK(pcbinfo);
 943                 in6_pcbdisconnect(inp);
 944                 inp->in6p_laddr = in6addr_any;
 945                 INP_HASH_WUNLOCK(pcbinfo);
 946                 soisdisconnected(so);
 947         }
 948         INP_WUNLOCK(inp);
 949 }
 950
 951 static int
 952 udp6_attach(struct socket *so, int proto, struct thread *td)
 953 {
 954         struct inpcb *inp;
 955         struct inpcbinfo *pcbinfo;
 956         int error;
 957
 958         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 959         inp = sotoinpcb(so);
 960         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
 961
 962         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 963                 error = soreserve(so, udp_sendspace, udp_recvspace);
 964                 if (error)
 965                         return (error);
 966         }
 967         INP_INFO_WLOCK(pcbinfo);
 968         error = in_pcballoc(so, pcbinfo);
 969         if (error) {
 970                 INP_INFO_WUNLOCK(pcbinfo);
 971                 return (error);
 972         }
 973         inp = (struct inpcb *)so->so_pcb;
 974         inp->inp_vflag |= INP_IPV6;
 975         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 976                 inp->inp_vflag |= INP_IPV4;
 977         inp->in6p_hops = -1;    /* use kernel default */
 978         inp->in6p_cksum = -1;   /* just to be sure */
 979         /*
 980          * XXX: ugly!!
 981          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 982          * because the socket may be bound to an IPv6 wildcard address,
 983          * which may match an IPv4-mapped IPv6 address.
 984          */
 985         inp->inp_ip_ttl = V_ip_defttl;
 986
 987         error = udp_newudpcb(inp);
 988         if (error) {
 989                 in_pcbdetach(inp);
 990                 in_pcbfree(inp);
 991                 INP_INFO_WUNLOCK(pcbinfo);
 992                 return (error);
 993         }
 994         INP_WUNLOCK(inp);
 995         INP_INFO_WUNLOCK(pcbinfo);
 996         return (0);
 997 }
 998
 999 static int
1000 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1001 {
1002         struct inpcb *inp;
1003         struct inpcbinfo *pcbinfo;
1004         int error;
1005         u_char vflagsav;
1006
1007         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1008         inp = sotoinpcb(so);
1009         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1010
1011         INP_WLOCK(inp);
1012         INP_HASH_WLOCK(pcbinfo);
1013         vflagsav = inp->inp_vflag;
1014         inp->inp_vflag &= ~INP_IPV4;
1015         inp->inp_vflag |= INP_IPV6;
1016         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1017                 struct sockaddr_in6 *sin6_p;
1018
1019                 sin6_p = (struct sockaddr_in6 *)nam;
1020
1021                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1022                         inp->inp_vflag |= INP_IPV4;
1023 #ifdef INET
1024                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1025                         struct sockaddr_in sin;
1026
1027                         in6_sin6_2_sin(&sin, sin6_p);
1028                         inp->inp_vflag |= INP_IPV4;
1029                         inp->inp_vflag &= ~INP_IPV6;
1030                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
1031                             td->td_ucred);
1032                         goto out;
1033                 }
1034 #endif
1035         }
1036
1037         error = in6_pcbbind(inp, nam, td->td_ucred);
1038 #ifdef INET
1039 out:
1040 #endif
1041         if (error != 0)
1042                 inp->inp_vflag = vflagsav;
1043         INP_HASH_WUNLOCK(pcbinfo);
1044         INP_WUNLOCK(inp);
1045         return (error);
1046 }
1047
1048 static void
1049 udp6_close(struct socket *so)
1050 {
1051         struct inpcb *inp;
1052         struct inpcbinfo *pcbinfo;
1053
1054         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1055         inp = sotoinpcb(so);
1056         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1057
1058         INP_WLOCK(inp);
1059 #ifdef INET
1060         if (inp->inp_vflag & INP_IPV4) {
1061                 struct pr_usrreqs *pru;
1062                 uint8_t nxt;
1063
1064                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1065                     IPPROTO_UDP : IPPROTO_UDPLITE;
1066                 INP_WUNLOCK(inp);
1067                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1068                 (*pru->pru_disconnect)(so);
1069                 return;
1070         }
1071 #endif
1072         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1073                 INP_HASH_WLOCK(pcbinfo);
1074                 in6_pcbdisconnect(inp);
1075                 inp->in6p_laddr = in6addr_any;
1076                 INP_HASH_WUNLOCK(pcbinfo);
1077                 soisdisconnected(so);
1078         }
1079         INP_WUNLOCK(inp);
1080 }
1081
1082 static int
1083 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1084 {
1085         struct inpcb *inp;
1086         struct inpcbinfo *pcbinfo;
1087         struct sockaddr_in6 *sin6;
1088         int error;
1089         u_char vflagsav;
1090
1091         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1092         inp = sotoinpcb(so);
1093         sin6 = (struct sockaddr_in6 *)nam;
1094         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1095
1096         /*
1097          * XXXRW: Need to clarify locking of v4/v6 flags.
1098          */
1099         INP_WLOCK(inp);
1100 #ifdef INET
1101         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1102                 struct sockaddr_in sin;
1103
1104                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1105                         error = EINVAL;
1106                         goto out;
1107                 }
1108                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1109                         error = EAFNOSUPPORT;
1110                         goto out;
1111                 }
1112                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1113                         error = EISCONN;
1114                         goto out;
1115                 }
1116                 in6_sin6_2_sin(&sin, sin6);
1117                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1118                 if (error != 0)
1119                         goto out;
1120                 vflagsav = inp->inp_vflag;
1121                 inp->inp_vflag |= INP_IPV4;
1122                 inp->inp_vflag &= ~INP_IPV6;
1123                 INP_HASH_WLOCK(pcbinfo);
1124                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1125                     td->td_ucred);
1126                 INP_HASH_WUNLOCK(pcbinfo);
1127                 /*
1128                  * If connect succeeds, mark socket as connected. If
1129                  * connect fails and socket is unbound, reset inp_vflag
1130                  * field.
1131                  */
1132                 if (error == 0)
1133                         soisconnected(so);
1134                 else if (inp->inp_laddr.s_addr == INADDR_ANY &&
1135                     inp->inp_lport == 0)
1136                         inp->inp_vflag = vflagsav;
1137                 goto out;
1138         } else {
1139                 if ((inp->inp_vflag & INP_IPV6) == 0) {
1140                         error = EAFNOSUPPORT;
1141                         goto out;
1142                 }
1143         }
1144 #endif
1145         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1146                 error = EISCONN;
1147                 goto out;
1148         }
1149         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1150         if (error != 0)
1151                 goto out;
1152         vflagsav = inp->inp_vflag;
1153         inp->inp_vflag &= ~INP_IPV4;
1154         inp->inp_vflag |= INP_IPV6;
1155         INP_HASH_WLOCK(pcbinfo);
1156         error = in6_pcbconnect(inp, nam, td->td_ucred);
1157         INP_HASH_WUNLOCK(pcbinfo);
1158         /*
1159          * If connect succeeds, mark socket as connected. If
1160          * connect fails and socket is unbound, reset inp_vflag
1161          * field.
1162          */
1163         if (error == 0)
1164                 soisconnected(so);
1165         else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1166             inp->inp_lport == 0)
1167                 inp->inp_vflag = vflagsav;
1168 out:
1169         INP_WUNLOCK(inp);
1170         return (error);
1171 }
1172
1173 static void
1174 udp6_detach(struct socket *so)
1175 {
1176         struct inpcb *inp;
1177         struct inpcbinfo *pcbinfo;
1178         struct udpcb *up;
1179
1180         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1181         inp = sotoinpcb(so);
1182         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1183
1184         INP_INFO_WLOCK(pcbinfo);
1185         INP_WLOCK(inp);
1186         up = intoudpcb(inp);
1187         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1188         in_pcbdetach(inp);
1189         in_pcbfree(inp);
1190         INP_INFO_WUNLOCK(pcbinfo);
1191         udp_discardcb(up);
1192 }
1193
1194 static int
1195 udp6_disconnect(struct socket *so)
1196 {
1197         struct inpcb *inp;
1198         struct inpcbinfo *pcbinfo;
1199         int error;
1200
1201         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1202         inp = sotoinpcb(so);
1203         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1204
1205         INP_WLOCK(inp);
1206 #ifdef INET
1207         if (inp->inp_vflag & INP_IPV4) {
1208                 struct pr_usrreqs *pru;
1209                 uint8_t nxt;
1210
1211                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1212                     IPPROTO_UDP : IPPROTO_UDPLITE;
1213                 INP_WUNLOCK(inp);
1214                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1215                 (void)(*pru->pru_disconnect)(so);
1216                 return (0);
1217         }
1218 #endif
1219
1220         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1221                 error = ENOTCONN;
1222                 goto out;
1223         }
1224
1225         INP_HASH_WLOCK(pcbinfo);
1226         in6_pcbdisconnect(inp);
1227         inp->in6p_laddr = in6addr_any;
1228         INP_HASH_WUNLOCK(pcbinfo);
1229         SOCK_LOCK(so);
1230         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1231         SOCK_UNLOCK(so);
1232 out:
1233         INP_WUNLOCK(inp);
1234         return (0);
1235 }
1236
1237 static int
1238 udp6_send(struct socket *so, int flags, struct mbuf *m,
1239     struct sockaddr *addr, struct mbuf *control, struct thread *td)
1240 {
1241         struct inpcb *inp;
1242         struct inpcbinfo *pcbinfo;
1243         int error = 0;
1244
1245         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1246         inp = sotoinpcb(so);
1247         KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1248
1249         INP_WLOCK(inp);
1250         if (addr) {
1251                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1252                         error = EINVAL;
1253                         goto bad;
1254                 }
1255                 if (addr->sa_family != AF_INET6) {
1256                         error = EAFNOSUPPORT;
1257                         goto bad;
1258                 }
1259         }
1260
1261 #ifdef INET
1262         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1263                 int hasv4addr;
1264                 struct sockaddr_in6 *sin6 = NULL;
1265
1266                 if (addr == NULL)
1267                         hasv4addr = (inp->inp_vflag & INP_IPV4);
1268                 else {
1269                         sin6 = (struct sockaddr_in6 *)addr;
1270                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1271                             ? 1 : 0;
1272                 }
1273                 if (hasv4addr) {
1274                         struct pr_usrreqs *pru;
1275                         uint8_t nxt;
1276
1277                         nxt = (inp->inp_socket->so_proto->pr_protocol ==
1278                             IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE;
1279                         /*
1280                          * XXXRW: We release UDP-layer locks before calling
1281                          * udp_send() in order to avoid recursion.  However,
1282                          * this does mean there is a short window where inp's
1283                          * fields are unstable.  Could this lead to a
1284                          * potential race in which the factors causing us to
1285                          * select the UDPv4 output routine are invalidated?
1286                          */
1287                         INP_WUNLOCK(inp);
1288                         if (sin6)
1289                                 in6_sin6_2_sin_in_sock(addr);
1290                         pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1291                         /* addr will just be freed in sendit(). */
1292                         return ((*pru->pru_send)(so, flags, m, addr, control,
1293                             td));
1294                 }
1295         }
1296 #endif
1297 #ifdef MAC
1298         mac_inpcb_create_mbuf(inp, m);
1299 #endif
1300         INP_HASH_WLOCK(pcbinfo);
1301         error = udp6_output(inp, m, addr, control, td);
1302         INP_HASH_WUNLOCK(pcbinfo);
1303         INP_WUNLOCK(inp);
1304         return (error);
1305
1306 bad:
1307         INP_WUNLOCK(inp);
1308         m_freem(m);
1309         return (error);
1310 }
1311
1312 struct pr_usrreqs udp6_usrreqs = {
1313         .pru_abort =            udp6_abort,
1314         .pru_attach =           udp6_attach,
1315         .pru_bind =             udp6_bind,
1316         .pru_connect =          udp6_connect,
1317         .pru_control =          in6_control,
1318         .pru_detach =           udp6_detach,
1319         .pru_disconnect =       udp6_disconnect,
1320         .pru_peeraddr =         in6_mapped_peeraddr,
1321         .pru_send =             udp6_send,
1322         .pru_shutdown =         udp_shutdown,
1323         .pru_sockaddr =         in6_mapped_sockaddr,
1324         .pru_soreceive =        soreceive_dgram,
1325         .pru_sosend =           sosend_dgram,
1326         .pru_sosetlabel =       in_pcbsosetlabel,
1327         .pru_close =            udp6_close
1328 };