sys/netinet6/udp6_usrreq.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   5  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   6  * Copyright (c) 2014 Kevin Lo
   7  * All rights reserved.
   8  *
   9  * Portions of this software were developed by Robert N. M. Watson under
  10  * contract to Juniper Networks, Inc.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the project nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
  37  *      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
  38  */
  39
  40 /*-
  41  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
  42  *      The Regents of the University of California.
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions and the following disclaimer.
  50  * 2. Redistributions in binary form must reproduce the above copyright
  51  *    notice, this list of conditions and the following disclaimer in the
  52  *    documentation and/or other materials provided with the distribution.
  53  * 3. Neither the name of the University nor the names of its contributors
  54  *    may be used to endorse or promote products derived from this software
  55  *    without specific prior written permission.
  56  *
  57  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  58  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  59  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  60  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  61  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  62  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  63  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  64  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  65  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  66  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  67  * SUCH DAMAGE.
  68  *
  69  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  70  */
  71
  72 #include <sys/cdefs.h>
  73 __FBSDID("$FreeBSD$");
  74
  75 #include "opt_inet.h"
  76 #include "opt_inet6.h"
  77 #include "opt_ipsec.h"
  78 #include "opt_rss.h"
  79
  80 #include <sys/param.h>
  81 #include <sys/jail.h>
  82 #include <sys/kernel.h>
  83 #include <sys/lock.h>
  84 #include <sys/mbuf.h>
  85 #include <sys/priv.h>
  86 #include <sys/proc.h>
  87 #include <sys/protosw.h>
  88 #include <sys/sdt.h>
  89 #include <sys/signalvar.h>
  90 #include <sys/socket.h>
  91 #include <sys/socketvar.h>
  92 #include <sys/sx.h>
  93 #include <sys/sysctl.h>
  94 #include <sys/syslog.h>
  95 #include <sys/systm.h>
  96
  97 #include <net/if.h>
  98 #include <net/if_var.h>
  99 #include <net/if_types.h>
 100 #include <net/route.h>
 101 #include <net/rss_config.h>
 102
 103 #include <netinet/in.h>
 104 #include <netinet/in_kdtrace.h>
 105 #include <netinet/in_pcb.h>
 106 #include <netinet/in_systm.h>
 107 #include <netinet/in_var.h>
 108 #include <netinet/ip.h>
 109 #include <netinet/ip6.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 #include <netipsec/ipsec_support.h>
 124
 125 #include <security/mac/mac_framework.h>
 126
 127 /*
 128  * UDP protocol implementation.
 129  * Per RFC 768, August, 1980.
 130  */
 131
 132 extern struct protosw   inetsw[];
 133 static void             udp6_detach(struct socket *so);
 134
 135 static int
 136 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
 137     struct sockaddr_in6 *fromsa)
 138 {
 139         struct socket *so;
 140         struct mbuf *opts = NULL, *tmp_opts;
 141         struct udpcb *up;
 142
 143         INP_LOCK_ASSERT(inp);
 144
 145         /*
 146          * Engage the tunneling protocol.
 147          */
 148         up = intoudpcb(inp);
 149         if (up->u_tun_func != NULL) {
 150                 in_pcbref(inp);
 151                 INP_RUNLOCK(inp);
 152                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&fromsa[0],
 153                     up->u_tun_ctx);
 154                 INP_RLOCK(inp);
 155                 return (in_pcbrele_rlocked(inp));
 156         }
 157 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 158         /* Check AH/ESP integrity. */
 159         if (IPSEC_ENABLED(ipv6)) {
 160                 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) {
 161                         m_freem(n);
 162                         return (0);
 163                 }
 164         }
 165 #endif /* IPSEC */
 166 #ifdef MAC
 167         if (mac_inpcb_check_deliver(inp, n) != 0) {
 168                 m_freem(n);
 169                 return (0);
 170         }
 171 #endif
 172         opts = NULL;
 173         if (inp->inp_flags & INP_CONTROLOPTS ||
 174             inp->inp_socket->so_options & SO_TIMESTAMP)
 175                 ip6_savecontrol(inp, n, &opts);
 176         if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
 177                 tmp_opts = sbcreatecontrol((caddr_t)&fromsa[1],
 178                         sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, IPPROTO_IPV6);
 179                 if (tmp_opts) {
 180                         if (opts) {
 181                                 tmp_opts->m_next = opts;
 182                                 opts = tmp_opts;
 183                         } else
 184                                 opts = tmp_opts;
 185                 }
 186
 187         }
 188         m_adj(n, off + sizeof(struct udphdr));
 189
 190         so = inp->inp_socket;
 191         SOCKBUF_LOCK(&so->so_rcv);
 192         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n,
 193             opts) == 0) {
 194                 SOCKBUF_UNLOCK(&so->so_rcv);
 195                 m_freem(n);
 196                 if (opts)
 197                         m_freem(opts);
 198                 UDPSTAT_INC(udps_fullsock);
 199         } else
 200                 sorwakeup_locked(so);
 201         return (0);
 202 }
 203
 204 int
 205 udp6_input(struct mbuf **mp, int *offp, int proto)
 206 {
 207         struct mbuf *m = *mp;
 208         struct ifnet *ifp;
 209         struct ip6_hdr *ip6;
 210         struct udphdr *uh;
 211         struct inpcb *inp;
 212         struct inpcbinfo *pcbinfo;
 213         struct udpcb *up;
 214         int off = *offp;
 215         int cscov_partial;
 216         int plen, ulen;
 217         struct epoch_tracker et;
 218         struct sockaddr_in6 fromsa[2];
 219         struct m_tag *fwd_tag;
 220         uint16_t uh_sum;
 221         uint8_t nxt;
 222
 223         ifp = m->m_pkthdr.rcvif;
 224
 225 #ifndef PULLDOWN_TEST
 226         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 227         ip6 = mtod(m, struct ip6_hdr *);
 228         uh = (struct udphdr *)((caddr_t)ip6 + off);
 229 #else
 230         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
 231         if (!uh)
 232                 return (IPPROTO_DONE);
 233         ip6 = mtod(m, struct ip6_hdr *);
 234 #endif
 235
 236         UDPSTAT_INC(udps_ipackets);
 237
 238         /*
 239          * Destination port of 0 is illegal, based on RFC768.
 240          */
 241         if (uh->uh_dport == 0)
 242                 goto badunlocked;
 243
 244         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 245         ulen = ntohs((u_short)uh->uh_ulen);
 246
 247         nxt = proto;
 248         cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
 249         if (nxt == IPPROTO_UDPLITE) {
 250                 /* Zero means checksum over the complete packet. */
 251                 if (ulen == 0)
 252                         ulen = plen;
 253                 if (ulen == plen)
 254                         cscov_partial = 0;
 255                 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
 256                         /* XXX: What is the right UDPLite MIB counter? */
 257                         goto badunlocked;
 258                 }
 259                 if (uh->uh_sum == 0) {
 260                         /* XXX: What is the right UDPLite MIB counter? */
 261                         goto badunlocked;
 262                 }
 263         } else {
 264                 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
 265                         UDPSTAT_INC(udps_badlen);
 266                         goto badunlocked;
 267                 }
 268                 if (uh->uh_sum == 0) {
 269                         UDPSTAT_INC(udps_nosum);
 270                         goto badunlocked;
 271                 }
 272         }
 273
 274         if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
 275             !cscov_partial) {
 276                 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 277                         uh_sum = m->m_pkthdr.csum_data;
 278                 else
 279                         uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
 280                             m->m_pkthdr.csum_data);
 281                 uh_sum ^= 0xffff;
 282         } else
 283                 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
 284
 285         if (uh_sum != 0) {
 286                 UDPSTAT_INC(udps_badsum);
 287                 goto badunlocked;
 288         }
 289
 290         /*
 291          * Construct sockaddr format source address.
 292          */
 293         init_sin6(&fromsa[0], m, 0);
 294         fromsa[0].sin6_port = uh->uh_sport;
 295         init_sin6(&fromsa[1], m, 1);
 296         fromsa[1].sin6_port = uh->uh_dport;
 297
 298         pcbinfo = udp_get_inpcbinfo(nxt);
 299         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 300                 struct inpcb *last;
 301                 struct inpcbhead *pcblist;
 302                 struct ip6_moptions *imo;
 303
 304                 INP_INFO_RLOCK_ET(pcbinfo, et);
 305                 /*
 306                  * In the event that laddr should be set to the link-local
 307                  * address (this happens in RIPng), the multicast address
 308                  * specified in the received packet will not match laddr.  To
 309                  * handle this situation, matching is relaxed if the
 310                  * receiving interface is the same as one specified in the
 311                  * socket and if the destination multicast address matches
 312                  * one of the multicast groups specified in the socket.
 313                  */
 314
 315                 /*
 316                  * KAME note: traditionally we dropped udpiphdr from mbuf
 317                  * here.  We need udphdr for IPsec processing so we do that
 318                  * later.
 319                  */
 320                 pcblist = udp_get_pcblist(nxt);
 321                 last = NULL;
 322                 CK_LIST_FOREACH(inp, pcblist, inp_list) {
 323                         if ((inp->inp_vflag & INP_IPV6) == 0)
 324                                 continue;
 325                         if (inp->inp_lport != uh->uh_dport)
 326                                 continue;
 327                         if (inp->inp_fport != 0 &&
 328                             inp->inp_fport != uh->uh_sport)
 329                                 continue;
 330                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 331                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 332                                                         &ip6->ip6_dst))
 333                                         continue;
 334                         }
 335                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 336                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 337                                                         &ip6->ip6_src) ||
 338                                     inp->inp_fport != uh->uh_sport)
 339                                         continue;
 340                         }
 341
 342                         /*
 343                          * XXXRW: Because we weren't holding either the inpcb
 344                          * or the hash lock when we checked for a match
 345                          * before, we should probably recheck now that the
 346                          * inpcb lock is (supposed to be) held.
 347                          */
 348
 349                         /*
 350                          * Handle socket delivery policy for any-source
 351                          * and source-specific multicast. [RFC3678]
 352                          */
 353                         imo = inp->in6p_moptions;
 354                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 355                                 struct sockaddr_in6      mcaddr;
 356                                 int                      blocked;
 357
 358                                 INP_RLOCK(inp);
 359                                 if (__predict_false(inp->inp_flags2 & INP_FREED)) {
 360                                         INP_RUNLOCK(inp);
 361                                         continue;
 362                                 }
 363
 364                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
 365                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
 366                                 mcaddr.sin6_family = AF_INET6;
 367                                 mcaddr.sin6_addr = ip6->ip6_dst;
 368
 369                                 blocked = im6o_mc_filter(imo, ifp,
 370                                         (struct sockaddr *)&mcaddr,
 371                                         (struct sockaddr *)&fromsa[0]);
 372                                 if (blocked != MCAST_PASS) {
 373                                         if (blocked == MCAST_NOTGMEMBER)
 374                                                 IP6STAT_INC(ip6s_notmember);
 375                                         if (blocked == MCAST_NOTSMEMBER ||
 376                                             blocked == MCAST_MUTED)
 377                                                 UDPSTAT_INC(udps_filtermcast);
 378                                         INP_RUNLOCK(inp); /* XXX */
 379                                         continue;
 380                                 }
 381
 382                                 INP_RUNLOCK(inp);
 383                         }
 384                         if (last != NULL) {
 385                                 struct mbuf *n;
 386
 387                                 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
 388                                     NULL) {
 389                                         INP_RLOCK(last);
 390                                         if (__predict_true(last->inp_flags2 & INP_FREED) == 0) {
 391                                                 if (nxt == IPPROTO_UDPLITE)
 392                                                         UDPLITE_PROBE(receive, NULL, last,
 393                                                             ip6, last, uh);
 394                                                 else
 395                                                         UDP_PROBE(receive, NULL, last,
 396                                                             ip6, last, uh);
 397                                                 if (udp6_append(last, n, off, fromsa))
 398                                                         goto inp_lost;
 399                                         }
 400                                         INP_RUNLOCK(last);
 401                                 }
 402                         }
 403                         last = inp;
 404                         /*
 405                          * Don't look for additional matches if this one does
 406                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 407                          * socket options set.  This heuristic avoids
 408                          * searching through all pcbs in the common case of a
 409                          * non-shared port.  It assumes that an application
 410                          * will never clear these options after setting them.
 411                          */
 412                         if ((last->inp_socket->so_options &
 413                              (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0)
 414                                 break;
 415                 }
 416
 417                 if (last == NULL) {
 418                         /*
 419                          * No matching pcb found; discard datagram.  (No need
 420                          * to send an ICMP Port Unreachable for a broadcast
 421                          * or multicast datgram.)
 422                          */
 423                         UDPSTAT_INC(udps_noport);
 424                         UDPSTAT_INC(udps_noportmcast);
 425                         goto badheadlocked;
 426                 }
 427                 INP_RLOCK(last);
 428                 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) {
 429                         if (nxt == IPPROTO_UDPLITE)
 430                                 UDPLITE_PROBE(receive, NULL, last, ip6, last, uh);
 431                         else
 432                                 UDP_PROBE(receive, NULL, last, ip6, last, uh);
 433                         if (udp6_append(last, m, off, fromsa) == 0)
 434                                 INP_RUNLOCK(last);
 435                 } else
 436                         INP_RUNLOCK(last);
 437                 INP_INFO_RUNLOCK_ET(pcbinfo, et);
 438         inp_lost:
 439                 return (IPPROTO_DONE);
 440         }
 441         /*
 442          * Locate pcb for datagram.
 443          */
 444
 445         /*
 446          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 447          */
 448         if ((m->m_flags & M_IP6_NEXTHOP) &&
 449             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 450                 struct sockaddr_in6 *next_hop6;
 451
 452                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
 453
 454                 /*
 455                  * Transparently forwarded. Pretend to be the destination.
 456                  * Already got one like this?
 457                  */
 458                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 459                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 460                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
 461                 if (!inp) {
 462                         /*
 463                          * It's new.  Try to find the ambushing socket.
 464                          * Because we've rewritten the destination address,
 465                          * any hardware-generated hash is ignored.
 466                          */
 467                         inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
 468                             uh->uh_sport, &next_hop6->sin6_addr,
 469                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
 470                             uh->uh_dport, INPLOOKUP_WILDCARD |
 471                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
 472                 }
 473                 /* Remove the tag from the packet. We don't need it anymore. */
 474                 m_tag_delete(m, fwd_tag);
 475                 m->m_flags &= ~M_IP6_NEXTHOP;
 476         } else
 477                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 478                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 479                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 480                     m->m_pkthdr.rcvif, m);
 481         if (inp == NULL) {
 482                 if (udp_log_in_vain) {
 483                         char ip6bufs[INET6_ADDRSTRLEN];
 484                         char ip6bufd[INET6_ADDRSTRLEN];
 485
 486                         log(LOG_INFO,
 487                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 488                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 489                             ntohs(uh->uh_dport),
 490                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 491                             ntohs(uh->uh_sport));
 492                 }
 493                 if (nxt == IPPROTO_UDPLITE)
 494                         UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh);
 495                 else
 496                         UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh);
 497                 UDPSTAT_INC(udps_noport);
 498                 if (m->m_flags & M_MCAST) {
 499                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 500                         UDPSTAT_INC(udps_noportmcast);
 501                         goto badunlocked;
 502                 }
 503                 if (V_udp_blackhole)
 504                         goto badunlocked;
 505                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 506                 return (IPPROTO_DONE);
 507         }
 508         INP_RLOCK_ASSERT(inp);
 509         up = intoudpcb(inp);
 510         if (cscov_partial) {
 511                 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
 512                         INP_RUNLOCK(inp);
 513                         m_freem(m);
 514                         return (IPPROTO_DONE);
 515                 }
 516         }
 517         if (nxt == IPPROTO_UDPLITE)
 518                 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh);
 519         else
 520                 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
 521         if (udp6_append(inp, m, off, fromsa) == 0)
 522                 INP_RUNLOCK(inp);
 523         return (IPPROTO_DONE);
 524
 525 badheadlocked:
 526         INP_INFO_RUNLOCK_ET(pcbinfo, et);
 527 badunlocked:
 528         if (m)
 529                 m_freem(m);
 530         return (IPPROTO_DONE);
 531 }
 532
 533 static void
 534 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
 535     struct inpcbinfo *pcbinfo)
 536 {
 537         struct udphdr uh;
 538         struct ip6_hdr *ip6;
 539         struct mbuf *m;
 540         int off = 0;
 541         struct ip6ctlparam *ip6cp = NULL;
 542         const struct sockaddr_in6 *sa6_src = NULL;
 543         void *cmdarg;
 544         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
 545         struct udp_portonly {
 546                 u_int16_t uh_sport;
 547                 u_int16_t uh_dport;
 548         } *uhp;
 549
 550         if (sa->sa_family != AF_INET6 ||
 551             sa->sa_len != sizeof(struct sockaddr_in6))
 552                 return;
 553
 554         if ((unsigned)cmd >= PRC_NCMDS)
 555                 return;
 556         if (PRC_IS_REDIRECT(cmd))
 557                 notify = in6_rtchange, d = NULL;
 558         else if (cmd == PRC_HOSTDEAD)
 559                 d = NULL;
 560         else if (inet6ctlerrmap[cmd] == 0)
 561                 return;
 562
 563         /* if the parameter is from icmp6, decode it. */
 564         if (d != NULL) {
 565                 ip6cp = (struct ip6ctlparam *)d;
 566                 m = ip6cp->ip6c_m;
 567                 ip6 = ip6cp->ip6c_ip6;
 568                 off = ip6cp->ip6c_off;
 569                 cmdarg = ip6cp->ip6c_cmdarg;
 570                 sa6_src = ip6cp->ip6c_src;
 571         } else {
 572                 m = NULL;
 573                 ip6 = NULL;
 574                 cmdarg = NULL;
 575                 sa6_src = &sa6_any;
 576         }
 577
 578         if (ip6) {
 579                 /*
 580                  * XXX: We assume that when IPV6 is non NULL,
 581                  * M and OFF are valid.
 582                  */
 583
 584                 /* Check if we can safely examine src and dst ports. */
 585                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 586                         return;
 587
 588                 bzero(&uh, sizeof(uh));
 589                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 590
 591                 if (!PRC_IS_REDIRECT(cmd)) {
 592                         /* Check to see if its tunneled */
 593                         struct inpcb *inp;
 594                         inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
 595                             uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
 596                             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 597                             m->m_pkthdr.rcvif, m);
 598                         if (inp != NULL) {
 599                                 struct udpcb *up;
 600
 601                                 up = intoudpcb(inp);
 602                                 if (up->u_icmp_func) {
 603                                         /* Yes it is. */
 604                                         INP_RUNLOCK(inp);
 605                                         (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
 606                                               d, up->u_tun_ctx);
 607                                         return;
 608                                 } else {
 609                                         /* Can't find it. */
 610                                         INP_RUNLOCK(inp);
 611                                 }
 612                         }
 613                 }
 614                 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
 615                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
 616                     cmdarg, notify);
 617         } else
 618                 (void)in6_pcbnotify(pcbinfo, sa, 0,
 619                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
 620 }
 621
 622 void
 623 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 624 {
 625
 626         return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
 627 }
 628
 629 void
 630 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 631 {
 632
 633         return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
 634 }
 635
 636 static int
 637 udp6_getcred(SYSCTL_HANDLER_ARGS)
 638 {
 639         struct xucred xuc;
 640         struct sockaddr_in6 addrs[2];
 641         struct inpcb *inp;
 642         int error;
 643
 644         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 645         if (error)
 646                 return (error);
 647
 648         if (req->newlen != sizeof(addrs))
 649                 return (EINVAL);
 650         if (req->oldlen != sizeof(struct xucred))
 651                 return (EINVAL);
 652         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 653         if (error)
 654                 return (error);
 655         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
 656             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
 657                 return (error);
 658         }
 659         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
 660             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
 661             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 662         if (inp != NULL) {
 663                 INP_RLOCK_ASSERT(inp);
 664                 if (inp->inp_socket == NULL)
 665                         error = ENOENT;
 666                 if (error == 0)
 667                         error = cr_canseesocket(req->td->td_ucred,
 668                             inp->inp_socket);
 669                 if (error == 0)
 670                         cru2x(inp->inp_cred, &xuc);
 671                 INP_RUNLOCK(inp);
 672         } else
 673                 error = ENOENT;
 674         if (error == 0)
 675                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 676         return (error);
 677 }
 678
 679 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
 680     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
 681
 682 static int
 683 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
 684     struct mbuf *control, struct thread *td)
 685 {
 686         u_int32_t ulen = m->m_pkthdr.len;
 687         u_int32_t plen = sizeof(struct udphdr) + ulen;
 688         struct ip6_hdr *ip6;
 689         struct udphdr *udp6;
 690         struct in6_addr *laddr, *faddr, in6a;
 691         struct sockaddr_in6 *sin6 = NULL;
 692         int cscov_partial = 0;
 693         int scope_ambiguous = 0;
 694         u_short fport;
 695         int error = 0;
 696         uint8_t nxt;
 697         uint16_t cscov = 0;
 698         struct ip6_pktopts *optp, opt;
 699         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
 700         int flags;
 701         struct sockaddr_in6 tmp;
 702
 703         INP_WLOCK_ASSERT(inp);
 704         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 705
 706         if (addr6) {
 707                 /* addr6 has been validated in udp6_send(). */
 708                 sin6 = (struct sockaddr_in6 *)addr6;
 709
 710                 /* protect *sin6 from overwrites */
 711                 tmp = *sin6;
 712                 sin6 = &tmp;
 713
 714                 /*
 715                  * Application should provide a proper zone ID or the use of
 716                  * default zone IDs should be enabled.  Unfortunately, some
 717                  * applications do not behave as it should, so we need a
 718                  * workaround.  Even if an appropriate ID is not determined,
 719                  * we'll see if we can determine the outgoing interface.  If we
 720                  * can, determine the zone ID based on the interface below.
 721                  */
 722                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
 723                         scope_ambiguous = 1;
 724                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 725                         return (error);
 726         }
 727
 728         nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 729             IPPROTO_UDP : IPPROTO_UDPLITE;
 730         if (control) {
 731                 if ((error = ip6_setpktopts(control, &opt,
 732                     inp->in6p_outputopts, td->td_ucred, nxt)) != 0)
 733                         goto release;
 734                 optp = &opt;
 735         } else
 736                 optp = inp->in6p_outputopts;
 737
 738         if (sin6) {
 739                 faddr = &sin6->sin6_addr;
 740
 741                 /*
 742                  * Since we saw no essential reason for calling in_pcbconnect,
 743                  * we get rid of such kind of logic, and call in6_selectsrc
 744                  * and in6_pcbsetport in order to fill in the local address
 745                  * and the local port.
 746                  */
 747                 if (sin6->sin6_port == 0) {
 748                         error = EADDRNOTAVAIL;
 749                         goto release;
 750                 }
 751
 752                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 753                         /* how about ::ffff:0.0.0.0 case? */
 754                         error = EISCONN;
 755                         goto release;
 756                 }
 757
 758                 fport = sin6->sin6_port; /* allow 0 port */
 759
 760                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
 761                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 762                                 /*
 763                                  * I believe we should explicitly discard the
 764                                  * packet when mapped addresses are disabled,
 765                                  * rather than send the packet as an IPv6 one.
 766                                  * If we chose the latter approach, the packet
 767                                  * might be sent out on the wire based on the
 768                                  * default route, the situation which we'd
 769                                  * probably want to avoid.
 770                                  * (20010421 jinmei@kame.net)
 771                                  */
 772                                 error = EINVAL;
 773                                 goto release;
 774                         }
 775                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
 776                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
 777                                 /*
 778                                  * when remote addr is an IPv4-mapped address,
 779                                  * local addr should not be an IPv6 address,
 780                                  * since you cannot determine how to map IPv6
 781                                  * source address to IPv4.
 782                                  */
 783                                 error = EINVAL;
 784                                 goto release;
 785                         }
 786
 787                         af = AF_INET;
 788                 }
 789
 790                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
 791                         error = in6_selectsrc_socket(sin6, optp, inp,
 792                             td->td_ucred, scope_ambiguous, &in6a, NULL);
 793                         if (error)
 794                                 goto release;
 795                         laddr = &in6a;
 796                 } else
 797                         laddr = &inp->in6p_laddr;       /* XXX */
 798                 if (laddr == NULL) {
 799                         if (error == 0)
 800                                 error = EADDRNOTAVAIL;
 801                         goto release;
 802                 }
 803                 if (inp->inp_lport == 0 &&
 804                     (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
 805                         /* Undo an address bind that may have occurred. */
 806                         inp->in6p_laddr = in6addr_any;
 807                         goto release;
 808                 }
 809         } else {
 810                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 811                         error = ENOTCONN;
 812                         goto release;
 813                 }
 814                 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
 815                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 816                                 /*
 817                                  * XXX: this case would happen when the
 818                                  * application sets the V6ONLY flag after
 819                                  * connecting the foreign address.
 820                                  * Such applications should be fixed,
 821                                  * so we bark here.
 822                                  */
 823                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
 824                                     "option was set for a connected socket\n");
 825                                 error = EINVAL;
 826                                 goto release;
 827                         } else
 828                                 af = AF_INET;
 829                 }
 830                 laddr = &inp->in6p_laddr;
 831                 faddr = &inp->in6p_faddr;
 832                 fport = inp->inp_fport;
 833         }
 834
 835         if (af == AF_INET)
 836                 hlen = sizeof(struct ip);
 837
 838         /*
 839          * Calculate data length and get a mbuf
 840          * for UDP and IP6 headers.
 841          */
 842         M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
 843         if (m == NULL) {
 844                 error = ENOBUFS;
 845                 goto release;
 846         }
 847
 848         /*
 849          * Stuff checksum and output datagram.
 850          */
 851         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
 852         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
 853         udp6->uh_dport = fport;
 854         if (nxt == IPPROTO_UDPLITE) {
 855                 struct udpcb *up;
 856
 857                 up = intoudpcb(inp);
 858                 cscov = up->u_txcslen;
 859                 if (cscov >= plen)
 860                         cscov = 0;
 861                 udp6->uh_ulen = htons(cscov);
 862                 /*
 863                  * For UDP-Lite, checksum coverage length of zero means
 864                  * the entire UDPLite packet is covered by the checksum.
 865                  */
 866                 cscov_partial = (cscov == 0) ? 0 : 1;
 867         } else if (plen <= 0xffff)
 868                 udp6->uh_ulen = htons((u_short)plen);
 869         else
 870                 udp6->uh_ulen = 0;
 871         udp6->uh_sum = 0;
 872
 873         switch (af) {
 874         case AF_INET6:
 875                 ip6 = mtod(m, struct ip6_hdr *);
 876                 ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
 877                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
 878                 ip6->ip6_vfc    |= IPV6_VERSION;
 879                 ip6->ip6_plen   = htons((u_short)plen);
 880                 ip6->ip6_nxt    = nxt;
 881                 ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
 882                 ip6->ip6_src    = *laddr;
 883                 ip6->ip6_dst    = *faddr;
 884
 885                 if (cscov_partial) {
 886                         if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
 887                             sizeof(struct ip6_hdr), plen, cscov)) == 0)
 888                                 udp6->uh_sum = 0xffff;
 889                 } else {
 890                         udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
 891                         m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
 892                         m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
 893                 }
 894
 895 #ifdef  RSS
 896                 {
 897                         uint32_t hash_val, hash_type;
 898                         uint8_t pr;
 899
 900                         pr = inp->inp_socket->so_proto->pr_protocol;
 901                         /*
 902                          * Calculate an appropriate RSS hash for UDP and
 903                          * UDP Lite.
 904                          *
 905                          * The called function will take care of figuring out
 906                          * whether a 2-tuple or 4-tuple hash is required based
 907                          * on the currently configured scheme.
 908                          *
 909                          * Later later on connected socket values should be
 910                          * cached in the inpcb and reused, rather than constantly
 911                          * re-calculating it.
 912                          *
 913                          * UDP Lite is a different protocol number and will
 914                          * likely end up being hashed as a 2-tuple until
 915                          * RSS / NICs grow UDP Lite protocol awareness.
 916                          */
 917                         if (rss_proto_software_hash_v6(faddr, laddr, fport,
 918                             inp->inp_lport, pr, &hash_val, &hash_type) == 0) {
 919                                 m->m_pkthdr.flowid = hash_val;
 920                                 M_HASHTYPE_SET(m, hash_type);
 921                         }
 922                 }
 923 #endif
 924                 flags = 0;
 925 #ifdef  RSS
 926                 /*
 927                  * Don't override with the inp cached flowid.
 928                  *
 929                  * Until the whole UDP path is vetted, it may actually
 930                  * be incorrect.
 931                  */
 932                 flags |= IP_NODEFAULTFLOWID;
 933 #endif
 934
 935                 if (nxt == IPPROTO_UDPLITE)
 936                         UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6);
 937                 else
 938                         UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
 939                 UDPSTAT_INC(udps_opackets);
 940                 error = ip6_output(m, optp, &inp->inp_route6, flags,
 941                     inp->in6p_moptions, NULL, inp);
 942                 break;
 943         case AF_INET:
 944                 error = EAFNOSUPPORT;
 945                 goto release;
 946         }
 947         goto releaseopt;
 948
 949 release:
 950         m_freem(m);
 951
 952 releaseopt:
 953         if (control) {
 954                 ip6_clearpktopts(&opt, -1);
 955                 m_freem(control);
 956         }
 957         return (error);
 958 }
 959
 960 static void
 961 udp6_abort(struct socket *so)
 962 {
 963         struct inpcb *inp;
 964         struct inpcbinfo *pcbinfo;
 965
 966         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 967         inp = sotoinpcb(so);
 968         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
 969
 970         INP_WLOCK(inp);
 971 #ifdef INET
 972         if (inp->inp_vflag & INP_IPV4) {
 973                 struct pr_usrreqs *pru;
 974                 uint8_t nxt;
 975
 976                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 977                     IPPROTO_UDP : IPPROTO_UDPLITE;
 978                 INP_WUNLOCK(inp);
 979                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
 980                 (*pru->pru_abort)(so);
 981                 return;
 982         }
 983 #endif
 984
 985         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 986                 INP_HASH_WLOCK(pcbinfo);
 987                 in6_pcbdisconnect(inp);
 988                 inp->in6p_laddr = in6addr_any;
 989                 INP_HASH_WUNLOCK(pcbinfo);
 990                 soisdisconnected(so);
 991         }
 992         INP_WUNLOCK(inp);
 993 }
 994
 995 static int
 996 udp6_attach(struct socket *so, int proto, struct thread *td)
 997 {
 998         struct inpcb *inp;
 999         struct inpcbinfo *pcbinfo;
1000         int error;
1001
1002         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1003         inp = sotoinpcb(so);
1004         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
1005
1006         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1007                 error = soreserve(so, udp_sendspace, udp_recvspace);
1008                 if (error)
1009                         return (error);
1010         }
1011         INP_INFO_WLOCK(pcbinfo);
1012         error = in_pcballoc(so, pcbinfo);
1013         if (error) {
1014                 INP_INFO_WUNLOCK(pcbinfo);
1015                 return (error);
1016         }
1017         inp = (struct inpcb *)so->so_pcb;
1018         inp->inp_vflag |= INP_IPV6;
1019         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
1020                 inp->inp_vflag |= INP_IPV4;
1021         inp->in6p_hops = -1;    /* use kernel default */
1022         inp->in6p_cksum = -1;   /* just to be sure */
1023         /*
1024          * XXX: ugly!!
1025          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
1026          * because the socket may be bound to an IPv6 wildcard address,
1027          * which may match an IPv4-mapped IPv6 address.
1028          */
1029         inp->inp_ip_ttl = V_ip_defttl;
1030
1031         error = udp_newudpcb(inp);
1032         if (error) {
1033                 in_pcbdetach(inp);
1034                 in_pcbfree(inp);
1035                 INP_INFO_WUNLOCK(pcbinfo);
1036                 return (error);
1037         }
1038         INP_WUNLOCK(inp);
1039         INP_INFO_WUNLOCK(pcbinfo);
1040         return (0);
1041 }
1042
1043 static int
1044 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1045 {
1046         struct inpcb *inp;
1047         struct inpcbinfo *pcbinfo;
1048         int error;
1049
1050         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1051         inp = sotoinpcb(so);
1052         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1053
1054         INP_WLOCK(inp);
1055         INP_HASH_WLOCK(pcbinfo);
1056         inp->inp_vflag &= ~INP_IPV4;
1057         inp->inp_vflag |= INP_IPV6;
1058         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1059                 struct sockaddr_in6 *sin6_p;
1060
1061                 sin6_p = (struct sockaddr_in6 *)nam;
1062
1063                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1064                         inp->inp_vflag |= INP_IPV4;
1065 #ifdef INET
1066                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1067                         struct sockaddr_in sin;
1068
1069                         in6_sin6_2_sin(&sin, sin6_p);
1070                         inp->inp_vflag |= INP_IPV4;
1071                         inp->inp_vflag &= ~INP_IPV6;
1072                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
1073                             td->td_ucred);
1074                         goto out;
1075                 }
1076 #endif
1077         }
1078
1079         error = in6_pcbbind(inp, nam, td->td_ucred);
1080 #ifdef INET
1081 out:
1082 #endif
1083         INP_HASH_WUNLOCK(pcbinfo);
1084         INP_WUNLOCK(inp);
1085         return (error);
1086 }
1087
1088 static void
1089 udp6_close(struct socket *so)
1090 {
1091         struct inpcb *inp;
1092         struct inpcbinfo *pcbinfo;
1093
1094         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1095         inp = sotoinpcb(so);
1096         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1097
1098         INP_WLOCK(inp);
1099 #ifdef INET
1100         if (inp->inp_vflag & INP_IPV4) {
1101                 struct pr_usrreqs *pru;
1102                 uint8_t nxt;
1103
1104                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1105                     IPPROTO_UDP : IPPROTO_UDPLITE;
1106                 INP_WUNLOCK(inp);
1107                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1108                 (*pru->pru_disconnect)(so);
1109                 return;
1110         }
1111 #endif
1112         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1113                 INP_HASH_WLOCK(pcbinfo);
1114                 in6_pcbdisconnect(inp);
1115                 inp->in6p_laddr = in6addr_any;
1116                 INP_HASH_WUNLOCK(pcbinfo);
1117                 soisdisconnected(so);
1118         }
1119         INP_WUNLOCK(inp);
1120 }
1121
1122 static int
1123 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1124 {
1125         struct inpcb *inp;
1126         struct inpcbinfo *pcbinfo;
1127         struct sockaddr_in6 *sin6;
1128         int error;
1129
1130         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1131         inp = sotoinpcb(so);
1132         sin6 = (struct sockaddr_in6 *)nam;
1133         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1134
1135         /*
1136          * XXXRW: Need to clarify locking of v4/v6 flags.
1137          */
1138         INP_WLOCK(inp);
1139 #ifdef INET
1140         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1141                 struct sockaddr_in sin;
1142
1143                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1144                         error = EINVAL;
1145                         goto out;
1146                 }
1147                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1148                         error = EAFNOSUPPORT;
1149                         goto out;
1150                 }
1151                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1152                         error = EISCONN;
1153                         goto out;
1154                 }
1155                 in6_sin6_2_sin(&sin, sin6);
1156                 inp->inp_vflag |= INP_IPV4;
1157                 inp->inp_vflag &= ~INP_IPV6;
1158                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1159                 if (error != 0)
1160                         goto out;
1161                 INP_HASH_WLOCK(pcbinfo);
1162                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1163                     td->td_ucred);
1164                 INP_HASH_WUNLOCK(pcbinfo);
1165                 if (error == 0)
1166                         soisconnected(so);
1167                 goto out;
1168         } else {
1169                 if ((inp->inp_vflag & INP_IPV6) == 0) {
1170                         error = EAFNOSUPPORT;
1171                         goto out;
1172                 }
1173         }
1174 #endif
1175         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1176                 error = EISCONN;
1177                 goto out;
1178         }
1179         inp->inp_vflag &= ~INP_IPV4;
1180         inp->inp_vflag |= INP_IPV6;
1181         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1182         if (error != 0)
1183                 goto out;
1184         INP_HASH_WLOCK(pcbinfo);
1185         error = in6_pcbconnect(inp, nam, td->td_ucred);
1186         INP_HASH_WUNLOCK(pcbinfo);
1187         if (error == 0)
1188                 soisconnected(so);
1189 out:
1190         INP_WUNLOCK(inp);
1191         return (error);
1192 }
1193
1194 static void
1195 udp6_detach(struct socket *so)
1196 {
1197         struct inpcb *inp;
1198         struct inpcbinfo *pcbinfo;
1199         struct udpcb *up;
1200
1201         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1202         inp = sotoinpcb(so);
1203         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1204
1205         INP_INFO_WLOCK(pcbinfo);
1206         INP_WLOCK(inp);
1207         up = intoudpcb(inp);
1208         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1209         in_pcbdetach(inp);
1210         in_pcbfree(inp);
1211         INP_INFO_WUNLOCK(pcbinfo);
1212         udp_discardcb(up);
1213 }
1214
1215 static int
1216 udp6_disconnect(struct socket *so)
1217 {
1218         struct inpcb *inp;
1219         struct inpcbinfo *pcbinfo;
1220
1221         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1222         inp = sotoinpcb(so);
1223         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1224
1225         INP_WLOCK(inp);
1226 #ifdef INET
1227         if (inp->inp_vflag & INP_IPV4) {
1228                 struct pr_usrreqs *pru;
1229                 uint8_t nxt;
1230
1231                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1232                     IPPROTO_UDP : IPPROTO_UDPLITE;
1233                 INP_WUNLOCK(inp);
1234                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1235                 (void)(*pru->pru_disconnect)(so);
1236                 return (0);
1237         }
1238 #endif
1239
1240         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1241                 INP_WUNLOCK(inp);
1242                 return (ENOTCONN);
1243         }
1244
1245         INP_HASH_WLOCK(pcbinfo);
1246         in6_pcbdisconnect(inp);
1247         inp->in6p_laddr = in6addr_any;
1248         INP_HASH_WUNLOCK(pcbinfo);
1249         SOCK_LOCK(so);
1250         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1251         SOCK_UNLOCK(so);
1252         INP_WUNLOCK(inp);
1253         return (0);
1254 }
1255
1256 static int
1257 udp6_send(struct socket *so, int flags, struct mbuf *m,
1258     struct sockaddr *addr, struct mbuf *control, struct thread *td)
1259 {
1260         struct inpcb *inp;
1261         struct inpcbinfo *pcbinfo;
1262         int error = 0;
1263
1264         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1265         inp = sotoinpcb(so);
1266         KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1267
1268         INP_WLOCK(inp);
1269         if (addr) {
1270                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1271                         error = EINVAL;
1272                         goto bad;
1273                 }
1274                 if (addr->sa_family != AF_INET6) {
1275                         error = EAFNOSUPPORT;
1276                         goto bad;
1277                 }
1278         }
1279
1280 #ifdef INET
1281         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1282                 int hasv4addr;
1283                 struct sockaddr_in6 *sin6 = NULL;
1284
1285                 if (addr == NULL)
1286                         hasv4addr = (inp->inp_vflag & INP_IPV4);
1287                 else {
1288                         sin6 = (struct sockaddr_in6 *)addr;
1289                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1290                             ? 1 : 0;
1291                 }
1292                 if (hasv4addr) {
1293                         struct pr_usrreqs *pru;
1294                         uint8_t nxt;
1295
1296                         nxt = (inp->inp_socket->so_proto->pr_protocol ==
1297                             IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE;
1298                         /*
1299                          * XXXRW: We release UDP-layer locks before calling
1300                          * udp_send() in order to avoid recursion.  However,
1301                          * this does mean there is a short window where inp's
1302                          * fields are unstable.  Could this lead to a
1303                          * potential race in which the factors causing us to
1304                          * select the UDPv4 output routine are invalidated?
1305                          */
1306                         INP_WUNLOCK(inp);
1307                         if (sin6)
1308                                 in6_sin6_2_sin_in_sock(addr);
1309                         pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1310                         /* addr will just be freed in sendit(). */
1311                         return ((*pru->pru_send)(so, flags, m, addr, control,
1312                             td));
1313                 }
1314         }
1315 #endif
1316 #ifdef MAC
1317         mac_inpcb_create_mbuf(inp, m);
1318 #endif
1319         INP_HASH_WLOCK(pcbinfo);
1320         error = udp6_output(inp, m, addr, control, td);
1321         INP_HASH_WUNLOCK(pcbinfo);
1322         INP_WUNLOCK(inp);
1323         return (error);
1324
1325 bad:
1326         INP_WUNLOCK(inp);
1327         m_freem(m);
1328         return (error);
1329 }
1330
1331 struct pr_usrreqs udp6_usrreqs = {
1332         .pru_abort =            udp6_abort,
1333         .pru_attach =           udp6_attach,
1334         .pru_bind =             udp6_bind,
1335         .pru_connect =          udp6_connect,
1336         .pru_control =          in6_control,
1337         .pru_detach =           udp6_detach,
1338         .pru_disconnect =       udp6_disconnect,
1339         .pru_peeraddr =         in6_mapped_peeraddr,
1340         .pru_send =             udp6_send,
1341         .pru_shutdown =         udp_shutdown,
1342         .pru_sockaddr =         in6_mapped_sockaddr,
1343         .pru_soreceive =        soreceive_dgram,
1344         .pru_sosend =           sosend_dgram,
1345         .pru_sosetlabel =       in_pcbsosetlabel,
1346         .pru_close =            udp6_close
1347 };