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/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
 116 #include <netinet6/ip6protosw.h>
 117 #include <netinet6/ip6_var.h>
 118 #include <netinet6/in6_pcb.h>
 119 #include <netinet6/in6_rss.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 int
 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                 in_pcbref(inp);
 154                 INP_RUNLOCK(inp);
 155                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa,
 156                     up->u_tun_ctx);
 157                 INP_RLOCK(inp);
 158                 return (in_pcbrele_rlocked(inp));
 159         }
 160 #ifdef IPSEC
 161         /* Check AH/ESP integrity. */
 162         if (ipsec6_in_reject(n, inp)) {
 163                 m_freem(n);
 164                 return (0);
 165         }
 166 #endif /* IPSEC */
 167 #ifdef MAC
 168         if (mac_inpcb_check_deliver(inp, n) != 0) {
 169                 m_freem(n);
 170                 return (0);
 171         }
 172 #endif
 173         opts = NULL;
 174         if (inp->inp_flags & INP_CONTROLOPTS ||
 175             inp->inp_socket->so_options & SO_TIMESTAMP)
 176                 ip6_savecontrol(inp, n, &opts);
 177         m_adj(n, off + sizeof(struct udphdr));
 178
 179         so = inp->inp_socket;
 180         SOCKBUF_LOCK(&so->so_rcv);
 181         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
 182             opts) == 0) {
 183                 SOCKBUF_UNLOCK(&so->so_rcv);
 184                 m_freem(n);
 185                 if (opts)
 186                         m_freem(opts);
 187                 UDPSTAT_INC(udps_fullsock);
 188         } else
 189                 sorwakeup_locked(so);
 190         return (0);
 191 }
 192
 193 int
 194 udp6_input(struct mbuf **mp, int *offp, int proto)
 195 {
 196         struct mbuf *m = *mp;
 197         struct ifnet *ifp;
 198         struct ip6_hdr *ip6;
 199         struct udphdr *uh;
 200         struct inpcb *inp;
 201         struct inpcbinfo *pcbinfo;
 202         struct udpcb *up;
 203         int off = *offp;
 204         int cscov_partial;
 205         int plen, ulen;
 206         struct sockaddr_in6 fromsa;
 207         struct m_tag *fwd_tag;
 208         uint16_t uh_sum;
 209         uint8_t nxt;
 210
 211         ifp = m->m_pkthdr.rcvif;
 212         ip6 = mtod(m, struct ip6_hdr *);
 213
 214 #ifndef PULLDOWN_TEST
 215         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 216         ip6 = mtod(m, struct ip6_hdr *);
 217         uh = (struct udphdr *)((caddr_t)ip6 + off);
 218 #else
 219         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
 220         if (!uh)
 221                 return (IPPROTO_DONE);
 222 #endif
 223
 224         UDPSTAT_INC(udps_ipackets);
 225
 226         /*
 227          * Destination port of 0 is illegal, based on RFC768.
 228          */
 229         if (uh->uh_dport == 0)
 230                 goto badunlocked;
 231
 232         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 233         ulen = ntohs((u_short)uh->uh_ulen);
 234
 235         nxt = proto;
 236         cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
 237         if (nxt == IPPROTO_UDPLITE) {
 238                 /* Zero means checksum over the complete packet. */
 239                 if (ulen == 0)
 240                         ulen = plen;
 241                 if (ulen == plen)
 242                         cscov_partial = 0;
 243                 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
 244                         /* XXX: What is the right UDPLite MIB counter? */
 245                         goto badunlocked;
 246                 }
 247                 if (uh->uh_sum == 0) {
 248                         /* XXX: What is the right UDPLite MIB counter? */
 249                         goto badunlocked;
 250                 }
 251         } else {
 252                 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
 253                         UDPSTAT_INC(udps_badlen);
 254                         goto badunlocked;
 255                 }
 256                 if (uh->uh_sum == 0) {
 257                         UDPSTAT_INC(udps_nosum);
 258                         goto badunlocked;
 259                 }
 260         }
 261
 262         if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
 263             !cscov_partial) {
 264                 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 265                         uh_sum = m->m_pkthdr.csum_data;
 266                 else
 267                         uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
 268                             m->m_pkthdr.csum_data);
 269                 uh_sum ^= 0xffff;
 270         } else
 271                 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
 272
 273         if (uh_sum != 0) {
 274                 UDPSTAT_INC(udps_badsum);
 275                 goto badunlocked;
 276         }
 277
 278         /*
 279          * Construct sockaddr format source address.
 280          */
 281         init_sin6(&fromsa, m);
 282         fromsa.sin6_port = uh->uh_sport;
 283
 284         pcbinfo = udp_get_inpcbinfo(nxt);
 285         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 286                 struct inpcb *last;
 287                 struct inpcbhead *pcblist;
 288                 struct ip6_moptions *imo;
 289
 290                 INP_INFO_RLOCK(pcbinfo);
 291                 /*
 292                  * In the event that laddr should be set to the link-local
 293                  * address (this happens in RIPng), the multicast address
 294                  * specified in the received packet will not match laddr.  To
 295                  * handle this situation, matching is relaxed if the
 296                  * receiving interface is the same as one specified in the
 297                  * socket and if the destination multicast address matches
 298                  * one of the multicast groups specified in the socket.
 299                  */
 300
 301                 /*
 302                  * KAME note: traditionally we dropped udpiphdr from mbuf
 303                  * here.  We need udphdr for IPsec processing so we do that
 304                  * later.
 305                  */
 306                 pcblist = udp_get_pcblist(nxt);
 307                 last = NULL;
 308                 LIST_FOREACH(inp, pcblist, inp_list) {
 309                         if ((inp->inp_vflag & INP_IPV6) == 0)
 310                                 continue;
 311                         if (inp->inp_lport != uh->uh_dport)
 312                                 continue;
 313                         if (inp->inp_fport != 0 &&
 314                             inp->inp_fport != uh->uh_sport)
 315                                 continue;
 316                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 317                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 318                                                         &ip6->ip6_dst))
 319                                         continue;
 320                         }
 321                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 322                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 323                                                         &ip6->ip6_src) ||
 324                                     inp->inp_fport != uh->uh_sport)
 325                                         continue;
 326                         }
 327
 328                         /*
 329                          * XXXRW: Because we weren't holding either the inpcb
 330                          * or the hash lock when we checked for a match
 331                          * before, we should probably recheck now that the
 332                          * inpcb lock is (supposed to be) held.
 333                          */
 334
 335                         /*
 336                          * Handle socket delivery policy for any-source
 337                          * and source-specific multicast. [RFC3678]
 338                          */
 339                         imo = inp->in6p_moptions;
 340                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 341                                 struct sockaddr_in6      mcaddr;
 342                                 int                      blocked;
 343
 344                                 INP_RLOCK(inp);
 345
 346                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
 347                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
 348                                 mcaddr.sin6_family = AF_INET6;
 349                                 mcaddr.sin6_addr = ip6->ip6_dst;
 350
 351                                 blocked = im6o_mc_filter(imo, ifp,
 352                                         (struct sockaddr *)&mcaddr,
 353                                         (struct sockaddr *)&fromsa);
 354                                 if (blocked != MCAST_PASS) {
 355                                         if (blocked == MCAST_NOTGMEMBER)
 356                                                 IP6STAT_INC(ip6s_notmember);
 357                                         if (blocked == MCAST_NOTSMEMBER ||
 358                                             blocked == MCAST_MUTED)
 359                                                 UDPSTAT_INC(udps_filtermcast);
 360                                         INP_RUNLOCK(inp); /* XXX */
 361                                         continue;
 362                                 }
 363
 364                                 INP_RUNLOCK(inp);
 365                         }
 366                         if (last != NULL) {
 367                                 struct mbuf *n;
 368
 369                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 370                                         INP_RLOCK(last);
 371                                         UDP_PROBE(receive, NULL, last, ip6,
 372                                             last, uh);
 373                                         if (udp6_append(last, n, off, &fromsa))
 374                                                 goto inp_lost;
 375                                         INP_RUNLOCK(last);
 376                                 }
 377                         }
 378                         last = inp;
 379                         /*
 380                          * Don't look for additional matches if this one does
 381                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 382                          * socket options set.  This heuristic avoids
 383                          * searching through all pcbs in the common case of a
 384                          * non-shared port.  It assumes that an application
 385                          * will never clear these options after setting them.
 386                          */
 387                         if ((last->inp_socket->so_options &
 388                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 389                                 break;
 390                 }
 391
 392                 if (last == NULL) {
 393                         /*
 394                          * No matching pcb found; discard datagram.  (No need
 395                          * to send an ICMP Port Unreachable for a broadcast
 396                          * or multicast datgram.)
 397                          */
 398                         UDPSTAT_INC(udps_noport);
 399                         UDPSTAT_INC(udps_noportmcast);
 400                         goto badheadlocked;
 401                 }
 402                 INP_RLOCK(last);
 403                 INP_INFO_RUNLOCK(pcbinfo);
 404                 UDP_PROBE(receive, NULL, last, ip6, last, uh);
 405                 if (udp6_append(last, m, off, &fromsa) == 0)
 406                         INP_RUNLOCK(last);
 407         inp_lost:
 408                 return (IPPROTO_DONE);
 409         }
 410         /*
 411          * Locate pcb for datagram.
 412          */
 413
 414         /*
 415          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 416          */
 417         if ((m->m_flags & M_IP6_NEXTHOP) &&
 418             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 419                 struct sockaddr_in6 *next_hop6;
 420
 421                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
 422
 423                 /*
 424                  * Transparently forwarded. Pretend to be the destination.
 425                  * Already got one like this?
 426                  */
 427                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 428                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 429                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
 430                 if (!inp) {
 431                         /*
 432                          * It's new.  Try to find the ambushing socket.
 433                          * Because we've rewritten the destination address,
 434                          * any hardware-generated hash is ignored.
 435                          */
 436                         inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
 437                             uh->uh_sport, &next_hop6->sin6_addr,
 438                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
 439                             uh->uh_dport, INPLOOKUP_WILDCARD |
 440                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
 441                 }
 442                 /* Remove the tag from the packet. We don't need it anymore. */
 443                 m_tag_delete(m, fwd_tag);
 444                 m->m_flags &= ~M_IP6_NEXTHOP;
 445         } else
 446                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 447                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 448                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 449                     m->m_pkthdr.rcvif, m);
 450         if (inp == NULL) {
 451                 if (udp_log_in_vain) {
 452                         char ip6bufs[INET6_ADDRSTRLEN];
 453                         char ip6bufd[INET6_ADDRSTRLEN];
 454
 455                         log(LOG_INFO,
 456                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 457                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 458                             ntohs(uh->uh_dport),
 459                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 460                             ntohs(uh->uh_sport));
 461                 }
 462                 UDPSTAT_INC(udps_noport);
 463                 if (m->m_flags & M_MCAST) {
 464                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 465                         UDPSTAT_INC(udps_noportmcast);
 466                         goto badunlocked;
 467                 }
 468                 if (V_udp_blackhole)
 469                         goto badunlocked;
 470                 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
 471                         goto badunlocked;
 472                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 473                 return (IPPROTO_DONE);
 474         }
 475         INP_RLOCK_ASSERT(inp);
 476         up = intoudpcb(inp);
 477         if (cscov_partial) {
 478                 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
 479                         INP_RUNLOCK(inp);
 480                         m_freem(m);
 481                         return (IPPROTO_DONE);
 482                 }
 483         }
 484         UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
 485         if (udp6_append(inp, m, off, &fromsa) == 0)
 486                 INP_RUNLOCK(inp);
 487         return (IPPROTO_DONE);
 488
 489 badheadlocked:
 490         INP_INFO_RUNLOCK(pcbinfo);
 491 badunlocked:
 492         if (m)
 493                 m_freem(m);
 494         return (IPPROTO_DONE);
 495 }
 496
 497 static void
 498 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
 499     struct inpcbinfo *pcbinfo)
 500 {
 501         struct udphdr uh;
 502         struct ip6_hdr *ip6;
 503         struct mbuf *m;
 504         int off = 0;
 505         struct ip6ctlparam *ip6cp = NULL;
 506         const struct sockaddr_in6 *sa6_src = NULL;
 507         void *cmdarg;
 508         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
 509         struct udp_portonly {
 510                 u_int16_t uh_sport;
 511                 u_int16_t uh_dport;
 512         } *uhp;
 513
 514         if (sa->sa_family != AF_INET6 ||
 515             sa->sa_len != sizeof(struct sockaddr_in6))
 516                 return;
 517
 518         if ((unsigned)cmd >= PRC_NCMDS)
 519                 return;
 520         if (PRC_IS_REDIRECT(cmd))
 521                 notify = in6_rtchange, d = NULL;
 522         else if (cmd == PRC_HOSTDEAD)
 523                 d = NULL;
 524         else if (inet6ctlerrmap[cmd] == 0)
 525                 return;
 526
 527         /* if the parameter is from icmp6, decode it. */
 528         if (d != NULL) {
 529                 ip6cp = (struct ip6ctlparam *)d;
 530                 m = ip6cp->ip6c_m;
 531                 ip6 = ip6cp->ip6c_ip6;
 532                 off = ip6cp->ip6c_off;
 533                 cmdarg = ip6cp->ip6c_cmdarg;
 534                 sa6_src = ip6cp->ip6c_src;
 535         } else {
 536                 m = NULL;
 537                 ip6 = NULL;
 538                 cmdarg = NULL;
 539                 sa6_src = &sa6_any;
 540         }
 541
 542         if (ip6) {
 543                 /*
 544                  * XXX: We assume that when IPV6 is non NULL,
 545                  * M and OFF are valid.
 546                  */
 547
 548                 /* Check if we can safely examine src and dst ports. */
 549                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 550                         return;
 551
 552                 bzero(&uh, sizeof(uh));
 553                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 554
 555                 if (!PRC_IS_REDIRECT(cmd)) {
 556                         /* Check to see if its tunneled */
 557                         struct inpcb *inp;
 558                         inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
 559                             uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
 560                             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 561                             m->m_pkthdr.rcvif, m);
 562                         if (inp != NULL) {
 563                                 struct udpcb *up;
 564
 565                                 up = intoudpcb(inp);
 566                                 if (up->u_icmp_func) {
 567                                         /* Yes it is. */
 568                                         INP_RUNLOCK(inp);
 569                                         (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
 570                                               d, up->u_tun_ctx);
 571                                         return;
 572                                 } else {
 573                                         /* Can't find it. */
 574                                         INP_RUNLOCK(inp);
 575                                 }
 576                         }
 577                 }
 578                 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
 579                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
 580                     cmdarg, notify);
 581         } else
 582                 (void)in6_pcbnotify(pcbinfo, sa, 0,
 583                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
 584 }
 585
 586 void
 587 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 588 {
 589
 590         return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
 591 }
 592
 593 void
 594 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 595 {
 596
 597         return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
 598 }
 599
 600 static int
 601 udp6_getcred(SYSCTL_HANDLER_ARGS)
 602 {
 603         struct xucred xuc;
 604         struct sockaddr_in6 addrs[2];
 605         struct inpcb *inp;
 606         int error;
 607
 608         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 609         if (error)
 610                 return (error);
 611
 612         if (req->newlen != sizeof(addrs))
 613                 return (EINVAL);
 614         if (req->oldlen != sizeof(struct xucred))
 615                 return (EINVAL);
 616         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 617         if (error)
 618                 return (error);
 619         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
 620             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
 621                 return (error);
 622         }
 623         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
 624             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
 625             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 626         if (inp != NULL) {
 627                 INP_RLOCK_ASSERT(inp);
 628                 if (inp->inp_socket == NULL)
 629                         error = ENOENT;
 630                 if (error == 0)
 631                         error = cr_canseesocket(req->td->td_ucred,
 632                             inp->inp_socket);
 633                 if (error == 0)
 634                         cru2x(inp->inp_cred, &xuc);
 635                 INP_RUNLOCK(inp);
 636         } else
 637                 error = ENOENT;
 638         if (error == 0)
 639                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 640         return (error);
 641 }
 642
 643 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
 644     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
 645
 646 static int
 647 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
 648     struct mbuf *control, struct thread *td)
 649 {
 650         u_int32_t ulen = m->m_pkthdr.len;
 651         u_int32_t plen = sizeof(struct udphdr) + ulen;
 652         struct ip6_hdr *ip6;
 653         struct udphdr *udp6;
 654         struct in6_addr *laddr, *faddr, in6a;
 655         struct sockaddr_in6 *sin6 = NULL;
 656         int cscov_partial = 0;
 657         int scope_ambiguous = 0;
 658         u_short fport;
 659         int error = 0;
 660         uint8_t nxt;
 661         uint16_t cscov = 0;
 662         struct ip6_pktopts *optp, opt;
 663         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
 664         int flags;
 665         struct sockaddr_in6 tmp;
 666
 667         INP_WLOCK_ASSERT(inp);
 668         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 669
 670         if (addr6) {
 671                 /* addr6 has been validated in udp6_send(). */
 672                 sin6 = (struct sockaddr_in6 *)addr6;
 673
 674                 /* protect *sin6 from overwrites */
 675                 tmp = *sin6;
 676                 sin6 = &tmp;
 677
 678                 /*
 679                  * Application should provide a proper zone ID or the use of
 680                  * default zone IDs should be enabled.  Unfortunately, some
 681                  * applications do not behave as it should, so we need a
 682                  * workaround.  Even if an appropriate ID is not determined,
 683                  * we'll see if we can determine the outgoing interface.  If we
 684                  * can, determine the zone ID based on the interface below.
 685                  */
 686                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
 687                         scope_ambiguous = 1;
 688                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 689                         return (error);
 690         }
 691
 692         nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 693             IPPROTO_UDP : IPPROTO_UDPLITE;
 694         if (control) {
 695                 if ((error = ip6_setpktopts(control, &opt,
 696                     inp->in6p_outputopts, td->td_ucred, nxt)) != 0)
 697                         goto release;
 698                 optp = &opt;
 699         } else
 700                 optp = inp->in6p_outputopts;
 701
 702         if (sin6) {
 703                 faddr = &sin6->sin6_addr;
 704
 705                 /*
 706                  * Since we saw no essential reason for calling in_pcbconnect,
 707                  * we get rid of such kind of logic, and call in6_selectsrc
 708                  * and in6_pcbsetport in order to fill in the local address
 709                  * and the local port.
 710                  */
 711                 if (sin6->sin6_port == 0) {
 712                         error = EADDRNOTAVAIL;
 713                         goto release;
 714                 }
 715
 716                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 717                         /* how about ::ffff:0.0.0.0 case? */
 718                         error = EISCONN;
 719                         goto release;
 720                 }
 721
 722                 fport = sin6->sin6_port; /* allow 0 port */
 723
 724                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
 725                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 726                                 /*
 727                                  * I believe we should explicitly discard the
 728                                  * packet when mapped addresses are disabled,
 729                                  * rather than send the packet as an IPv6 one.
 730                                  * If we chose the latter approach, the packet
 731                                  * might be sent out on the wire based on the
 732                                  * default route, the situation which we'd
 733                                  * probably want to avoid.
 734                                  * (20010421 jinmei@kame.net)
 735                                  */
 736                                 error = EINVAL;
 737                                 goto release;
 738                         }
 739                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
 740                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
 741                                 /*
 742                                  * when remote addr is an IPv4-mapped address,
 743                                  * local addr should not be an IPv6 address,
 744                                  * since you cannot determine how to map IPv6
 745                                  * source address to IPv4.
 746                                  */
 747                                 error = EINVAL;
 748                                 goto release;
 749                         }
 750
 751                         af = AF_INET;
 752                 }
 753
 754                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
 755                         error = in6_selectsrc_socket(sin6, optp, inp,
 756                             td->td_ucred, scope_ambiguous, &in6a, NULL);
 757                         if (error)
 758                                 goto release;
 759                         laddr = &in6a;
 760                 } else
 761                         laddr = &inp->in6p_laddr;       /* XXX */
 762                 if (laddr == NULL) {
 763                         if (error == 0)
 764                                 error = EADDRNOTAVAIL;
 765                         goto release;
 766                 }
 767                 if (inp->inp_lport == 0 &&
 768                     (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
 769                         /* Undo an address bind that may have occurred. */
 770                         inp->in6p_laddr = in6addr_any;
 771                         goto release;
 772                 }
 773         } else {
 774                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 775                         error = ENOTCONN;
 776                         goto release;
 777                 }
 778                 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
 779                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 780                                 /*
 781                                  * XXX: this case would happen when the
 782                                  * application sets the V6ONLY flag after
 783                                  * connecting the foreign address.
 784                                  * Such applications should be fixed,
 785                                  * so we bark here.
 786                                  */
 787                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
 788                                     "option was set for a connected socket\n");
 789                                 error = EINVAL;
 790                                 goto release;
 791                         } else
 792                                 af = AF_INET;
 793                 }
 794                 laddr = &inp->in6p_laddr;
 795                 faddr = &inp->in6p_faddr;
 796                 fport = inp->inp_fport;
 797         }
 798
 799         if (af == AF_INET)
 800                 hlen = sizeof(struct ip);
 801
 802         /*
 803          * Calculate data length and get a mbuf
 804          * for UDP and IP6 headers.
 805          */
 806         M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
 807         if (m == NULL) {
 808                 error = ENOBUFS;
 809                 goto release;
 810         }
 811
 812         /*
 813          * Stuff checksum and output datagram.
 814          */
 815         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
 816         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
 817         udp6->uh_dport = fport;
 818         if (nxt == IPPROTO_UDPLITE) {
 819                 struct udpcb *up;
 820
 821                 up = intoudpcb(inp);
 822                 cscov = up->u_txcslen;
 823                 if (cscov >= plen)
 824                         cscov = 0;
 825                 udp6->uh_ulen = htons(cscov);
 826                 /*
 827                  * For UDP-Lite, checksum coverage length of zero means
 828                  * the entire UDPLite packet is covered by the checksum.
 829                  */
 830                 cscov_partial = (cscov == 0) ? 0 : 1;
 831         } else if (plen <= 0xffff)
 832                 udp6->uh_ulen = htons((u_short)plen);
 833         else
 834                 udp6->uh_ulen = 0;
 835         udp6->uh_sum = 0;
 836
 837         switch (af) {
 838         case AF_INET6:
 839                 ip6 = mtod(m, struct ip6_hdr *);
 840                 ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
 841                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
 842                 ip6->ip6_vfc    |= IPV6_VERSION;
 843                 ip6->ip6_plen   = htons((u_short)plen);
 844                 ip6->ip6_nxt    = nxt;
 845                 ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
 846                 ip6->ip6_src    = *laddr;
 847                 ip6->ip6_dst    = *faddr;
 848
 849                 if (cscov_partial) {
 850                         if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
 851                             sizeof(struct ip6_hdr), plen, cscov)) == 0)
 852                                 udp6->uh_sum = 0xffff;
 853                 } else {
 854                         udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
 855                         m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
 856                         m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
 857                 }
 858
 859 #ifdef  RSS
 860                 {
 861                         uint32_t hash_val, hash_type;
 862                         uint8_t pr;
 863
 864                         pr = inp->inp_socket->so_proto->pr_protocol;
 865                         /*
 866                          * Calculate an appropriate RSS hash for UDP and
 867                          * UDP Lite.
 868                          *
 869                          * The called function will take care of figuring out
 870                          * whether a 2-tuple or 4-tuple hash is required based
 871                          * on the currently configured scheme.
 872                          *
 873                          * Later later on connected socket values should be
 874                          * cached in the inpcb and reused, rather than constantly
 875                          * re-calculating it.
 876                          *
 877                          * UDP Lite is a different protocol number and will
 878                          * likely end up being hashed as a 2-tuple until
 879                          * RSS / NICs grow UDP Lite protocol awareness.
 880                          */
 881                         if (rss_proto_software_hash_v6(faddr, laddr, fport,
 882                             inp->inp_lport, pr, &hash_val, &hash_type) == 0) {
 883                                 m->m_pkthdr.flowid = hash_val;
 884                                 M_HASHTYPE_SET(m, hash_type);
 885                         }
 886                 }
 887 #endif
 888                 flags = 0;
 889 #ifdef  RSS
 890                 /*
 891                  * Don't override with the inp cached flowid.
 892                  *
 893                  * Until the whole UDP path is vetted, it may actually
 894                  * be incorrect.
 895                  */
 896                 flags |= IP_NODEFAULTFLOWID;
 897 #endif
 898
 899                 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
 900                 UDPSTAT_INC(udps_opackets);
 901                 error = ip6_output(m, optp, &inp->inp_route6, flags,
 902                     inp->in6p_moptions, NULL, inp);
 903                 break;
 904         case AF_INET:
 905                 error = EAFNOSUPPORT;
 906                 goto release;
 907         }
 908         goto releaseopt;
 909
 910 release:
 911         m_freem(m);
 912
 913 releaseopt:
 914         if (control) {
 915                 ip6_clearpktopts(&opt, -1);
 916                 m_freem(control);
 917         }
 918         return (error);
 919 }
 920
 921 static void
 922 udp6_abort(struct socket *so)
 923 {
 924         struct inpcb *inp;
 925         struct inpcbinfo *pcbinfo;
 926
 927         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 928         inp = sotoinpcb(so);
 929         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
 930
 931         INP_WLOCK(inp);
 932 #ifdef INET
 933         if (inp->inp_vflag & INP_IPV4) {
 934                 struct pr_usrreqs *pru;
 935                 uint8_t nxt;
 936
 937                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 938                     IPPROTO_UDP : IPPROTO_UDPLITE;
 939                 INP_WUNLOCK(inp);
 940                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
 941                 (*pru->pru_abort)(so);
 942                 return;
 943         }
 944 #endif
 945
 946         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 947                 INP_HASH_WLOCK(pcbinfo);
 948                 in6_pcbdisconnect(inp);
 949                 inp->in6p_laddr = in6addr_any;
 950                 INP_HASH_WUNLOCK(pcbinfo);
 951                 soisdisconnected(so);
 952         }
 953         INP_WUNLOCK(inp);
 954 }
 955
 956 static int
 957 udp6_attach(struct socket *so, int proto, struct thread *td)
 958 {
 959         struct inpcb *inp;
 960         struct inpcbinfo *pcbinfo;
 961         int error;
 962
 963         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 964         inp = sotoinpcb(so);
 965         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
 966
 967         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 968                 error = soreserve(so, udp_sendspace, udp_recvspace);
 969                 if (error)
 970                         return (error);
 971         }
 972         INP_INFO_WLOCK(pcbinfo);
 973         error = in_pcballoc(so, pcbinfo);
 974         if (error) {
 975                 INP_INFO_WUNLOCK(pcbinfo);
 976                 return (error);
 977         }
 978         inp = (struct inpcb *)so->so_pcb;
 979         inp->inp_vflag |= INP_IPV6;
 980         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 981                 inp->inp_vflag |= INP_IPV4;
 982         inp->in6p_hops = -1;    /* use kernel default */
 983         inp->in6p_cksum = -1;   /* just to be sure */
 984         /*
 985          * XXX: ugly!!
 986          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 987          * because the socket may be bound to an IPv6 wildcard address,
 988          * which may match an IPv4-mapped IPv6 address.
 989          */
 990         inp->inp_ip_ttl = V_ip_defttl;
 991
 992         error = udp_newudpcb(inp);
 993         if (error) {
 994                 in_pcbdetach(inp);
 995                 in_pcbfree(inp);
 996                 INP_INFO_WUNLOCK(pcbinfo);
 997                 return (error);
 998         }
 999         INP_WUNLOCK(inp);
1000         INP_INFO_WUNLOCK(pcbinfo);
1001         return (0);
1002 }
1003
1004 static int
1005 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1006 {
1007         struct inpcb *inp;
1008         struct inpcbinfo *pcbinfo;
1009         int error;
1010
1011         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1012         inp = sotoinpcb(so);
1013         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1014
1015         INP_WLOCK(inp);
1016         INP_HASH_WLOCK(pcbinfo);
1017         inp->inp_vflag &= ~INP_IPV4;
1018         inp->inp_vflag |= INP_IPV6;
1019         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1020                 struct sockaddr_in6 *sin6_p;
1021
1022                 sin6_p = (struct sockaddr_in6 *)nam;
1023
1024                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1025                         inp->inp_vflag |= INP_IPV4;
1026 #ifdef INET
1027                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1028                         struct sockaddr_in sin;
1029
1030                         in6_sin6_2_sin(&sin, sin6_p);
1031                         inp->inp_vflag |= INP_IPV4;
1032                         inp->inp_vflag &= ~INP_IPV6;
1033                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
1034                             td->td_ucred);
1035                         goto out;
1036                 }
1037 #endif
1038         }
1039
1040         error = in6_pcbbind(inp, nam, td->td_ucred);
1041 #ifdef INET
1042 out:
1043 #endif
1044         INP_HASH_WUNLOCK(pcbinfo);
1045         INP_WUNLOCK(inp);
1046         return (error);
1047 }
1048
1049 static void
1050 udp6_close(struct socket *so)
1051 {
1052         struct inpcb *inp;
1053         struct inpcbinfo *pcbinfo;
1054
1055         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1056         inp = sotoinpcb(so);
1057         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1058
1059         INP_WLOCK(inp);
1060 #ifdef INET
1061         if (inp->inp_vflag & INP_IPV4) {
1062                 struct pr_usrreqs *pru;
1063                 uint8_t nxt;
1064
1065                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1066                     IPPROTO_UDP : IPPROTO_UDPLITE;
1067                 INP_WUNLOCK(inp);
1068                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1069                 (*pru->pru_disconnect)(so);
1070                 return;
1071         }
1072 #endif
1073         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1074                 INP_HASH_WLOCK(pcbinfo);
1075                 in6_pcbdisconnect(inp);
1076                 inp->in6p_laddr = in6addr_any;
1077                 INP_HASH_WUNLOCK(pcbinfo);
1078                 soisdisconnected(so);
1079         }
1080         INP_WUNLOCK(inp);
1081 }
1082
1083 static int
1084 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1085 {
1086         struct inpcb *inp;
1087         struct inpcbinfo *pcbinfo;
1088         struct sockaddr_in6 *sin6;
1089         int error;
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_faddr.s_addr != INADDR_ANY) {
1109                         error = EISCONN;
1110                         goto out;
1111                 }
1112                 in6_sin6_2_sin(&sin, sin6);
1113                 inp->inp_vflag |= INP_IPV4;
1114                 inp->inp_vflag &= ~INP_IPV6;
1115                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1116                 if (error != 0)
1117                         goto out;
1118                 INP_HASH_WLOCK(pcbinfo);
1119                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1120                     td->td_ucred);
1121                 INP_HASH_WUNLOCK(pcbinfo);
1122                 if (error == 0)
1123                         soisconnected(so);
1124                 goto out;
1125         }
1126 #endif
1127         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1128                 error = EISCONN;
1129                 goto out;
1130         }
1131         inp->inp_vflag &= ~INP_IPV4;
1132         inp->inp_vflag |= INP_IPV6;
1133         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1134         if (error != 0)
1135                 goto out;
1136         INP_HASH_WLOCK(pcbinfo);
1137         error = in6_pcbconnect(inp, nam, td->td_ucred);
1138         INP_HASH_WUNLOCK(pcbinfo);
1139         if (error == 0)
1140                 soisconnected(so);
1141 out:
1142         INP_WUNLOCK(inp);
1143         return (error);
1144 }
1145
1146 static void
1147 udp6_detach(struct socket *so)
1148 {
1149         struct inpcb *inp;
1150         struct inpcbinfo *pcbinfo;
1151         struct udpcb *up;
1152
1153         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1154         inp = sotoinpcb(so);
1155         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1156
1157         INP_INFO_WLOCK(pcbinfo);
1158         INP_WLOCK(inp);
1159         up = intoudpcb(inp);
1160         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1161         in_pcbdetach(inp);
1162         in_pcbfree(inp);
1163         INP_INFO_WUNLOCK(pcbinfo);
1164         udp_discardcb(up);
1165 }
1166
1167 static int
1168 udp6_disconnect(struct socket *so)
1169 {
1170         struct inpcb *inp;
1171         struct inpcbinfo *pcbinfo;
1172         int error;
1173
1174         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1175         inp = sotoinpcb(so);
1176         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1177
1178         INP_WLOCK(inp);
1179 #ifdef INET
1180         if (inp->inp_vflag & INP_IPV4) {
1181                 struct pr_usrreqs *pru;
1182                 uint8_t nxt;
1183
1184                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1185                     IPPROTO_UDP : IPPROTO_UDPLITE;
1186                 INP_WUNLOCK(inp);
1187                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1188                 (void)(*pru->pru_disconnect)(so);
1189                 return (0);
1190         }
1191 #endif
1192
1193         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1194                 error = ENOTCONN;
1195                 goto out;
1196         }
1197
1198         INP_HASH_WLOCK(pcbinfo);
1199         in6_pcbdisconnect(inp);
1200         inp->in6p_laddr = in6addr_any;
1201         INP_HASH_WUNLOCK(pcbinfo);
1202         SOCK_LOCK(so);
1203         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1204         SOCK_UNLOCK(so);
1205 out:
1206         INP_WUNLOCK(inp);
1207         return (0);
1208 }
1209
1210 static int
1211 udp6_send(struct socket *so, int flags, struct mbuf *m,
1212     struct sockaddr *addr, struct mbuf *control, struct thread *td)
1213 {
1214         struct inpcb *inp;
1215         struct inpcbinfo *pcbinfo;
1216         int error = 0;
1217
1218         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1219         inp = sotoinpcb(so);
1220         KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1221
1222         INP_WLOCK(inp);
1223         if (addr) {
1224                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1225                         error = EINVAL;
1226                         goto bad;
1227                 }
1228                 if (addr->sa_family != AF_INET6) {
1229                         error = EAFNOSUPPORT;
1230                         goto bad;
1231                 }
1232         }
1233
1234 #ifdef INET
1235         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1236                 int hasv4addr;
1237                 struct sockaddr_in6 *sin6 = NULL;
1238
1239                 if (addr == NULL)
1240                         hasv4addr = (inp->inp_vflag & INP_IPV4);
1241                 else {
1242                         sin6 = (struct sockaddr_in6 *)addr;
1243                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1244                             ? 1 : 0;
1245                 }
1246                 if (hasv4addr) {
1247                         struct pr_usrreqs *pru;
1248                         uint8_t nxt;
1249
1250                         nxt = (inp->inp_socket->so_proto->pr_protocol ==
1251                             IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE;
1252                         /*
1253                          * XXXRW: We release UDP-layer locks before calling
1254                          * udp_send() in order to avoid recursion.  However,
1255                          * this does mean there is a short window where inp's
1256                          * fields are unstable.  Could this lead to a
1257                          * potential race in which the factors causing us to
1258                          * select the UDPv4 output routine are invalidated?
1259                          */
1260                         INP_WUNLOCK(inp);
1261                         if (sin6)
1262                                 in6_sin6_2_sin_in_sock(addr);
1263                         pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1264                         /* addr will just be freed in sendit(). */
1265                         return ((*pru->pru_send)(so, flags, m, addr, control,
1266                             td));
1267                 }
1268         }
1269 #endif
1270 #ifdef MAC
1271         mac_inpcb_create_mbuf(inp, m);
1272 #endif
1273         INP_HASH_WLOCK(pcbinfo);
1274         error = udp6_output(inp, m, addr, control, td);
1275         INP_HASH_WUNLOCK(pcbinfo);
1276         INP_WUNLOCK(inp);
1277         return (error);
1278
1279 bad:
1280         INP_WUNLOCK(inp);
1281         m_freem(m);
1282         return (error);
1283 }
1284
1285 struct pr_usrreqs udp6_usrreqs = {
1286         .pru_abort =            udp6_abort,
1287         .pru_attach =           udp6_attach,
1288         .pru_bind =             udp6_bind,
1289         .pru_connect =          udp6_connect,
1290         .pru_control =          in6_control,
1291         .pru_detach =           udp6_detach,
1292         .pru_disconnect =       udp6_disconnect,
1293         .pru_peeraddr =         in6_mapped_peeraddr,
1294         .pru_send =             udp6_send,
1295         .pru_shutdown =         udp_shutdown,
1296         .pru_sockaddr =         in6_mapped_sockaddr,
1297         .pru_soreceive =        soreceive_dgram,
1298         .pru_sosend =           sosend_dgram,
1299         .pru_sosetlabel =       in_pcbsosetlabel,
1300         .pru_close =            udp6_close
1301 };