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_route.h"
  79 #include "opt_rss.h"
  80
  81 #include <sys/param.h>
  82 #include <sys/jail.h>
  83 #include <sys/kernel.h>
  84 #include <sys/lock.h>
  85 #include <sys/mbuf.h>
  86 #include <sys/priv.h>
  87 #include <sys/proc.h>
  88 #include <sys/protosw.h>
  89 #include <sys/sdt.h>
  90 #include <sys/signalvar.h>
  91 #include <sys/socket.h>
  92 #include <sys/socketvar.h>
  93 #include <sys/sx.h>
  94 #include <sys/sysctl.h>
  95 #include <sys/syslog.h>
  96 #include <sys/systm.h>
  97
  98 #include <net/if.h>
  99 #include <net/if_var.h>
 100 #include <net/if_types.h>
 101 #include <net/route.h>
 102 #include <net/rss_config.h>
 103
 104 #include <netinet/in.h>
 105 #include <netinet/in_kdtrace.h>
 106 #include <netinet/in_pcb.h>
 107 #include <netinet/in_systm.h>
 108 #include <netinet/in_var.h>
 109 #include <netinet/ip.h>
 110 #include <netinet/ip6.h>
 111 #include <netinet/icmp6.h>
 112 #include <netinet/ip_var.h>
 113 #include <netinet/udp.h>
 114 #include <netinet/udp_var.h>
 115 #include <netinet/udplite.h>
 116
 117 #include <netinet6/ip6protosw.h>
 118 #include <netinet6/ip6_var.h>
 119 #include <netinet6/in6_fib.h>
 120 #include <netinet6/in6_pcb.h>
 121 #include <netinet6/in6_rss.h>
 122 #include <netinet6/udp6_var.h>
 123 #include <netinet6/scope6_var.h>
 124
 125 #include <netipsec/ipsec_support.h>
 126
 127 #include <security/mac/mac_framework.h>
 128
 129 VNET_DEFINE(int, zero_checksum_port) = 0;
 130 #define V_zero_checksum_port    VNET(zero_checksum_port)
 131 SYSCTL_INT(_net_inet6_udp6, OID_AUTO, rfc6935_port, CTLFLAG_VNET | CTLFLAG_RW,
 132     &VNET_NAME(zero_checksum_port), 0,
 133     "Zero UDP checksum allowed for traffic to/from this port.");
 134 /*
 135  * UDP protocol implementation.
 136  * Per RFC 768, August, 1980.
 137  */
 138
 139 extern struct protosw   inetsw[];
 140 static void             udp6_detach(struct socket *so);
 141
 142 static int
 143 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
 144     struct sockaddr_in6 *fromsa)
 145 {
 146         struct socket *so;
 147         struct mbuf *opts = NULL, *tmp_opts;
 148         struct udpcb *up;
 149
 150         INP_LOCK_ASSERT(inp);
 151
 152         /*
 153          * Engage the tunneling protocol.
 154          */
 155         up = intoudpcb(inp);
 156         if (up->u_tun_func != NULL) {
 157                 in_pcbref(inp);
 158                 INP_RUNLOCK(inp);
 159                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&fromsa[0],
 160                     up->u_tun_ctx);
 161                 INP_RLOCK(inp);
 162                 return (in_pcbrele_rlocked(inp));
 163         }
 164 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 165         /* Check AH/ESP integrity. */
 166         if (IPSEC_ENABLED(ipv6)) {
 167                 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) {
 168                         m_freem(n);
 169                         return (0);
 170                 }
 171         }
 172 #endif /* IPSEC */
 173 #ifdef MAC
 174         if (mac_inpcb_check_deliver(inp, n) != 0) {
 175                 m_freem(n);
 176                 return (0);
 177         }
 178 #endif
 179         opts = NULL;
 180         if (inp->inp_flags & INP_CONTROLOPTS ||
 181             inp->inp_socket->so_options & SO_TIMESTAMP)
 182                 ip6_savecontrol(inp, n, &opts);
 183         if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
 184                 tmp_opts = sbcreatecontrol((caddr_t)&fromsa[1],
 185                         sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, IPPROTO_IPV6);
 186                 if (tmp_opts) {
 187                         if (opts) {
 188                                 tmp_opts->m_next = opts;
 189                                 opts = tmp_opts;
 190                         } else
 191                                 opts = tmp_opts;
 192                 }
 193         }
 194         m_adj(n, off + sizeof(struct udphdr));
 195
 196         so = inp->inp_socket;
 197         SOCKBUF_LOCK(&so->so_rcv);
 198         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n,
 199             opts) == 0) {
 200                 soroverflow_locked(so);
 201                 m_freem(n);
 202                 if (opts)
 203                         m_freem(opts);
 204                 UDPSTAT_INC(udps_fullsock);
 205         } else
 206                 sorwakeup_locked(so);
 207         return (0);
 208 }
 209
 210 int
 211 udp6_input(struct mbuf **mp, int *offp, int proto)
 212 {
 213         struct mbuf *m = *mp;
 214         struct ifnet *ifp;
 215         struct ip6_hdr *ip6;
 216         struct udphdr *uh;
 217         struct inpcb *inp;
 218         struct inpcbinfo *pcbinfo;
 219         struct udpcb *up;
 220         int off = *offp;
 221         int cscov_partial;
 222         int plen, ulen;
 223         struct sockaddr_in6 fromsa[2];
 224         struct m_tag *fwd_tag;
 225         uint16_t uh_sum;
 226         uint8_t nxt;
 227
 228         NET_EPOCH_ASSERT();
 229
 230         ifp = m->m_pkthdr.rcvif;
 231
 232         if (m->m_len < off + sizeof(struct udphdr)) {
 233                 m = m_pullup(m, off + sizeof(struct udphdr));
 234                 if (m == NULL) {
 235                         IP6STAT_INC(ip6s_exthdrtoolong);
 236                         *mp = NULL;
 237                         return (IPPROTO_DONE);
 238                 }
 239         }
 240         ip6 = mtod(m, struct ip6_hdr *);
 241         uh = (struct udphdr *)((caddr_t)ip6 + off);
 242
 243         UDPSTAT_INC(udps_ipackets);
 244
 245         /*
 246          * Destination port of 0 is illegal, based on RFC768.
 247          */
 248         if (uh->uh_dport == 0)
 249                 goto badunlocked;
 250
 251         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 252         ulen = ntohs((u_short)uh->uh_ulen);
 253
 254         nxt = proto;
 255         cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
 256         if (nxt == IPPROTO_UDPLITE) {
 257                 /* Zero means checksum over the complete packet. */
 258                 if (ulen == 0)
 259                         ulen = plen;
 260                 if (ulen == plen)
 261                         cscov_partial = 0;
 262                 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
 263                         /* XXX: What is the right UDPLite MIB counter? */
 264                         goto badunlocked;
 265                 }
 266                 if (uh->uh_sum == 0) {
 267                         /* XXX: What is the right UDPLite MIB counter? */
 268                         goto badunlocked;
 269                 }
 270         } else {
 271                 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
 272                         UDPSTAT_INC(udps_badlen);
 273                         goto badunlocked;
 274                 }
 275                 if (uh->uh_sum == 0) {
 276                         UDPSTAT_INC(udps_nosum);
 277                         /*
 278                          * dport 0 was rejected earlier so this is OK even if
 279                          * zero_checksum_port is 0 (which is its default value).
 280                          */
 281                         if (ntohs(uh->uh_dport) == V_zero_checksum_port)
 282                                 goto skip_checksum;
 283                         else
 284                                 goto badunlocked;
 285                 }
 286         }
 287
 288         if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
 289             !cscov_partial) {
 290                 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 291                         uh_sum = m->m_pkthdr.csum_data;
 292                 else
 293                         uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
 294                             m->m_pkthdr.csum_data);
 295                 uh_sum ^= 0xffff;
 296         } else
 297                 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
 298
 299         if (uh_sum != 0) {
 300                 UDPSTAT_INC(udps_badsum);
 301                 goto badunlocked;
 302         }
 303
 304 skip_checksum:
 305         /*
 306          * Construct sockaddr format source address.
 307          */
 308         init_sin6(&fromsa[0], m, 0);
 309         fromsa[0].sin6_port = uh->uh_sport;
 310         init_sin6(&fromsa[1], m, 1);
 311         fromsa[1].sin6_port = uh->uh_dport;
 312
 313         pcbinfo = udp_get_inpcbinfo(nxt);
 314         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 315                 struct inpcb *last;
 316                 struct inpcbhead *pcblist;
 317                 struct ip6_moptions *imo;
 318
 319                 /*
 320                  * In the event that laddr should be set to the link-local
 321                  * address (this happens in RIPng), the multicast address
 322                  * specified in the received packet will not match laddr.  To
 323                  * handle this situation, matching is relaxed if the
 324                  * receiving interface is the same as one specified in the
 325                  * socket and if the destination multicast address matches
 326                  * one of the multicast groups specified in the socket.
 327                  */
 328
 329                 /*
 330                  * KAME note: traditionally we dropped udpiphdr from mbuf
 331                  * here.  We need udphdr for IPsec processing so we do that
 332                  * later.
 333                  */
 334                 pcblist = udp_get_pcblist(nxt);
 335                 last = NULL;
 336                 CK_LIST_FOREACH(inp, pcblist, inp_list) {
 337                         if ((inp->inp_vflag & INP_IPV6) == 0)
 338                                 continue;
 339                         if (inp->inp_lport != uh->uh_dport)
 340                                 continue;
 341                         if (inp->inp_fport != 0 &&
 342                             inp->inp_fport != uh->uh_sport)
 343                                 continue;
 344                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 345                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 346                                                         &ip6->ip6_dst))
 347                                         continue;
 348                         }
 349                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 350                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 351                                                         &ip6->ip6_src) ||
 352                                     inp->inp_fport != uh->uh_sport)
 353                                         continue;
 354                         }
 355
 356                         INP_RLOCK(inp);
 357
 358                         if (__predict_false(inp->inp_flags2 & INP_FREED)) {
 359                                 INP_RUNLOCK(inp);
 360                                 continue;
 361                         }
 362
 363                         /*
 364                          * XXXRW: Because we weren't holding either the inpcb
 365                          * or the hash lock when we checked for a match
 366                          * before, we should probably recheck now that the
 367                          * inpcb lock is (supposed to be) held.
 368                          */
 369
 370                         /*
 371                          * Handle socket delivery policy for any-source
 372                          * and source-specific multicast. [RFC3678]
 373                          */
 374                         imo = inp->in6p_moptions;
 375                         if (imo != NULL) {
 376                                 struct sockaddr_in6      mcaddr;
 377                                 int                      blocked;
 378
 379                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
 380                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
 381                                 mcaddr.sin6_family = AF_INET6;
 382                                 mcaddr.sin6_addr = ip6->ip6_dst;
 383
 384                                 blocked = im6o_mc_filter(imo, ifp,
 385                                         (struct sockaddr *)&mcaddr,
 386                                         (struct sockaddr *)&fromsa[0]);
 387                                 if (blocked != MCAST_PASS) {
 388                                         if (blocked == MCAST_NOTGMEMBER)
 389                                                 IP6STAT_INC(ip6s_notmember);
 390                                         if (blocked == MCAST_NOTSMEMBER ||
 391                                             blocked == MCAST_MUTED)
 392                                                 UDPSTAT_INC(udps_filtermcast);
 393                                         INP_RUNLOCK(inp);
 394                                         continue;
 395                                 }
 396                         }
 397
 398                         if (last != NULL) {
 399                                 struct mbuf *n;
 400
 401                                 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
 402                                     NULL) {
 403                                         if (nxt == IPPROTO_UDPLITE)
 404                                                 UDPLITE_PROBE(receive, NULL,
 405                                                     last, ip6, last, uh);
 406                                         else
 407                                                 UDP_PROBE(receive, NULL, last,
 408                                                     ip6, last, uh);
 409                                         if (udp6_append(last, n, off,
 410                                             fromsa)) {
 411                                                 INP_RUNLOCK(inp);
 412                                                 goto badunlocked;
 413                                         }
 414                                 }
 415                                 /* Release PCB lock taken on previous pass. */
 416                                 INP_RUNLOCK(last);
 417                         }
 418                         last = inp;
 419                         /*
 420                          * Don't look for additional matches if this one does
 421                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 422                          * socket options set.  This heuristic avoids
 423                          * searching through all pcbs in the common case of a
 424                          * non-shared port.  It assumes that an application
 425                          * will never clear these options after setting them.
 426                          */
 427                         if ((last->inp_socket->so_options &
 428                              (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0)
 429                                 break;
 430                 }
 431
 432                 if (last == NULL) {
 433                         /*
 434                          * No matching pcb found; discard datagram.  (No need
 435                          * to send an ICMP Port Unreachable for a broadcast
 436                          * or multicast datgram.)
 437                          */
 438                         UDPSTAT_INC(udps_noport);
 439                         UDPSTAT_INC(udps_noportmcast);
 440                         goto badunlocked;
 441                 }
 442
 443                 if (nxt == IPPROTO_UDPLITE)
 444                         UDPLITE_PROBE(receive, NULL, last, ip6, last, uh);
 445                 else
 446                         UDP_PROBE(receive, NULL, last, ip6, last, uh);
 447                 if (udp6_append(last, m, off, fromsa) == 0)
 448                         INP_RUNLOCK(last);
 449                 *mp = NULL;
 450                 return (IPPROTO_DONE);
 451         }
 452         /*
 453          * Locate pcb for datagram.
 454          */
 455
 456         /*
 457          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 458          */
 459         if ((m->m_flags & M_IP6_NEXTHOP) &&
 460             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 461                 struct sockaddr_in6 *next_hop6;
 462
 463                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
 464
 465                 /*
 466                  * Transparently forwarded. Pretend to be the destination.
 467                  * Already got one like this?
 468                  */
 469                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 470                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 471                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
 472                 if (!inp) {
 473                         /*
 474                          * It's new.  Try to find the ambushing socket.
 475                          * Because we've rewritten the destination address,
 476                          * any hardware-generated hash is ignored.
 477                          */
 478                         inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
 479                             uh->uh_sport, &next_hop6->sin6_addr,
 480                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
 481                             uh->uh_dport, INPLOOKUP_WILDCARD |
 482                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
 483                 }
 484                 /* Remove the tag from the packet. We don't need it anymore. */
 485                 m_tag_delete(m, fwd_tag);
 486                 m->m_flags &= ~M_IP6_NEXTHOP;
 487         } else
 488                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 489                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 490                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 491                     m->m_pkthdr.rcvif, m);
 492         if (inp == NULL) {
 493                 if (V_udp_log_in_vain) {
 494                         char ip6bufs[INET6_ADDRSTRLEN];
 495                         char ip6bufd[INET6_ADDRSTRLEN];
 496
 497                         log(LOG_INFO,
 498                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 499                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 500                             ntohs(uh->uh_dport),
 501                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 502                             ntohs(uh->uh_sport));
 503                 }
 504                 if (nxt == IPPROTO_UDPLITE)
 505                         UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh);
 506                 else
 507                         UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh);
 508                 UDPSTAT_INC(udps_noport);
 509                 if (m->m_flags & M_MCAST) {
 510                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 511                         UDPSTAT_INC(udps_noportmcast);
 512                         goto badunlocked;
 513                 }
 514                 if (V_udp_blackhole && (V_udp_blackhole_local ||
 515                     !in6_localaddr(&ip6->ip6_src)))
 516                         goto badunlocked;
 517                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 518                 *mp = NULL;
 519                 return (IPPROTO_DONE);
 520         }
 521         INP_RLOCK_ASSERT(inp);
 522         up = intoudpcb(inp);
 523         if (cscov_partial) {
 524                 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
 525                         INP_RUNLOCK(inp);
 526                         m_freem(m);
 527                         *mp = NULL;
 528                         return (IPPROTO_DONE);
 529                 }
 530         }
 531         if (nxt == IPPROTO_UDPLITE)
 532                 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh);
 533         else
 534                 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
 535         if (udp6_append(inp, m, off, fromsa) == 0)
 536                 INP_RUNLOCK(inp);
 537         *mp = NULL;
 538         return (IPPROTO_DONE);
 539
 540 badunlocked:
 541         m_freem(m);
 542         *mp = NULL;
 543         return (IPPROTO_DONE);
 544 }
 545
 546 static void
 547 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
 548     struct inpcbinfo *pcbinfo)
 549 {
 550         struct udphdr uh;
 551         struct ip6_hdr *ip6;
 552         struct mbuf *m;
 553         int off = 0;
 554         struct ip6ctlparam *ip6cp = NULL;
 555         const struct sockaddr_in6 *sa6_src = NULL;
 556         void *cmdarg;
 557         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
 558         struct udp_portonly {
 559                 u_int16_t uh_sport;
 560                 u_int16_t uh_dport;
 561         } *uhp;
 562
 563         if (sa->sa_family != AF_INET6 ||
 564             sa->sa_len != sizeof(struct sockaddr_in6))
 565                 return;
 566
 567         if ((unsigned)cmd >= PRC_NCMDS)
 568                 return;
 569         if (PRC_IS_REDIRECT(cmd))
 570                 notify = in6_rtchange, d = NULL;
 571         else if (cmd == PRC_HOSTDEAD)
 572                 d = NULL;
 573         else if (inet6ctlerrmap[cmd] == 0)
 574                 return;
 575
 576         /* if the parameter is from icmp6, decode it. */
 577         if (d != NULL) {
 578                 ip6cp = (struct ip6ctlparam *)d;
 579                 m = ip6cp->ip6c_m;
 580                 ip6 = ip6cp->ip6c_ip6;
 581                 off = ip6cp->ip6c_off;
 582                 cmdarg = ip6cp->ip6c_cmdarg;
 583                 sa6_src = ip6cp->ip6c_src;
 584         } else {
 585                 m = NULL;
 586                 ip6 = NULL;
 587                 cmdarg = NULL;
 588                 sa6_src = &sa6_any;
 589         }
 590
 591         if (ip6) {
 592                 /*
 593                  * XXX: We assume that when IPV6 is non NULL,
 594                  * M and OFF are valid.
 595                  */
 596
 597                 /* Check if we can safely examine src and dst ports. */
 598                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 599                         return;
 600
 601                 bzero(&uh, sizeof(uh));
 602                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 603
 604                 if (!PRC_IS_REDIRECT(cmd)) {
 605                         /* Check to see if its tunneled */
 606                         struct inpcb *inp;
 607                         inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
 608                             uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
 609                             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 610                             m->m_pkthdr.rcvif, m);
 611                         if (inp != NULL) {
 612                                 struct udpcb *up;
 613
 614                                 up = intoudpcb(inp);
 615                                 if (up->u_icmp_func) {
 616                                         /* Yes it is. */
 617                                         INP_RUNLOCK(inp);
 618                                         (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
 619                                               d, up->u_tun_ctx);
 620                                         return;
 621                                 } else {
 622                                         /* Can't find it. */
 623                                         INP_RUNLOCK(inp);
 624                                 }
 625                         }
 626                 }
 627                 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
 628                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
 629                     cmdarg, notify);
 630         } else
 631                 (void)in6_pcbnotify(pcbinfo, sa, 0,
 632                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
 633 }
 634
 635 void
 636 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 637 {
 638
 639         return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
 640 }
 641
 642 void
 643 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 644 {
 645
 646         return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
 647 }
 648
 649 static int
 650 udp6_getcred(SYSCTL_HANDLER_ARGS)
 651 {
 652         struct xucred xuc;
 653         struct sockaddr_in6 addrs[2];
 654         struct epoch_tracker et;
 655         struct inpcb *inp;
 656         int error;
 657
 658         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 659         if (error)
 660                 return (error);
 661
 662         if (req->newlen != sizeof(addrs))
 663                 return (EINVAL);
 664         if (req->oldlen != sizeof(struct xucred))
 665                 return (EINVAL);
 666         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 667         if (error)
 668                 return (error);
 669         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
 670             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
 671                 return (error);
 672         }
 673         NET_EPOCH_ENTER(et);
 674         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
 675             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
 676             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 677         NET_EPOCH_EXIT(et);
 678         if (inp != NULL) {
 679                 INP_RLOCK_ASSERT(inp);
 680                 if (inp->inp_socket == NULL)
 681                         error = ENOENT;
 682                 if (error == 0)
 683                         error = cr_canseesocket(req->td->td_ucred,
 684                             inp->inp_socket);
 685                 if (error == 0)
 686                         cru2x(inp->inp_cred, &xuc);
 687                 INP_RUNLOCK(inp);
 688         } else
 689                 error = ENOENT;
 690         if (error == 0)
 691                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 692         return (error);
 693 }
 694
 695 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred,
 696     CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE,
 697     0, 0, udp6_getcred, "S,xucred",
 698     "Get the xucred of a UDP6 connection");
 699
 700 static int
 701 udp6_output(struct socket *so, int flags_arg, struct mbuf *m,
 702     struct sockaddr *addr6, struct mbuf *control, struct thread *td)
 703 {
 704         struct inpcb *inp;
 705         struct ip6_hdr *ip6;
 706         struct udphdr *udp6;
 707         struct in6_addr *laddr, *faddr, in6a;
 708         struct ip6_pktopts *optp, opt;
 709         struct sockaddr_in6 *sin6, tmp;
 710         struct epoch_tracker et;
 711         int cscov_partial, error, flags, hlen, scope_ambiguous;
 712         u_int32_t ulen, plen;
 713         uint16_t cscov;
 714         u_short fport;
 715         uint8_t nxt;
 716
 717         /* addr6 has been validated in udp6_send(). */
 718         sin6 = (struct sockaddr_in6 *)addr6;
 719
 720         /*
 721          * In contrast to to IPv4 we do not validate the max. packet length
 722          * here due to IPv6 Jumbograms (RFC2675).
 723          */
 724
 725         scope_ambiguous = 0;
 726         if (sin6) {
 727                 /* Protect *addr6 from overwrites. */
 728                 tmp = *sin6;
 729                 sin6 = &tmp;
 730
 731                 /*
 732                  * Application should provide a proper zone ID or the use of
 733                  * default zone IDs should be enabled.  Unfortunately, some
 734                  * applications do not behave as it should, so we need a
 735                  * workaround.  Even if an appropriate ID is not determined,
 736                  * we'll see if we can determine the outgoing interface.  If we
 737                  * can, determine the zone ID based on the interface below.
 738                  */
 739                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
 740                         scope_ambiguous = 1;
 741                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) {
 742                         if (control)
 743                                 m_freem(control);
 744                         m_freem(m);
 745                         return (error);
 746                 }
 747         }
 748
 749         inp = sotoinpcb(so);
 750         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 751         /*
 752          * In the following cases we want a write lock on the inp for either
 753          * local operations or for possible route cache updates in the IPv6
 754          * output path:
 755          * - on connected sockets (sin6 is NULL) for route cache updates,
 756          * - when we are not bound to an address and source port (it is
 757          *   in6_pcbsetport() which will require the write lock).
 758          *
 759          * We check the inp fields before actually locking the inp, so
 760          * here exists a race, and we may WLOCK the inp and end with already
 761          * bound one by other thread. This is fine.
 762          */
 763         if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
 764             inp->inp_lport == 0))
 765                 INP_WLOCK(inp);
 766         else
 767                 INP_RLOCK(inp);
 768
 769         nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 770             IPPROTO_UDP : IPPROTO_UDPLITE;
 771
 772 #ifdef INET
 773         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 774                 int hasv4addr;
 775
 776                 if (sin6 == NULL)
 777                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 778                 else
 779                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 780                             ? 1 : 0;
 781                 if (hasv4addr) {
 782                         struct pr_usrreqs *pru;
 783
 784                         /*
 785                          * XXXRW: We release UDP-layer locks before calling
 786                          * udp_send() in order to avoid recursion.  However,
 787                          * this does mean there is a short window where inp's
 788                          * fields are unstable.  Could this lead to a
 789                          * potential race in which the factors causing us to
 790                          * select the UDPv4 output routine are invalidated?
 791                          */
 792                         INP_UNLOCK(inp);
 793                         if (sin6)
 794                                 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6);
 795                         pru = inetsw[ip_protox[nxt]].pr_usrreqs;
 796                         /* addr will just be freed in sendit(). */
 797                         return ((*pru->pru_send)(so, flags_arg | PRUS_IPV6, m,
 798                             (struct sockaddr *)sin6, control, td));
 799                 }
 800         } else
 801 #endif
 802         if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 803                 /*
 804                  * Given this is either an IPv6-only socket or no INET is
 805                  * supported we will fail the send if the given destination
 806                  * address is a v4mapped address.
 807                  *
 808                  * XXXGL: do we leak m and control?
 809                  */
 810                 INP_UNLOCK(inp);
 811                 return (EINVAL);
 812         }
 813
 814         NET_EPOCH_ENTER(et);
 815         if (control) {
 816                 if ((error = ip6_setpktopts(control, &opt,
 817                     inp->in6p_outputopts, td->td_ucred, nxt)) != 0) {
 818                         goto release;
 819                 }
 820                 optp = &opt;
 821         } else
 822                 optp = inp->in6p_outputopts;
 823
 824         if (sin6) {
 825                 /*
 826                  * Since we saw no essential reason for calling in_pcbconnect,
 827                  * we get rid of such kind of logic, and call in6_selectsrc
 828                  * and in6_pcbsetport in order to fill in the local address
 829                  * and the local port.
 830                  */
 831                 if (sin6->sin6_port == 0) {
 832                         error = EADDRNOTAVAIL;
 833                         goto release;
 834                 }
 835
 836                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 837                         /* how about ::ffff:0.0.0.0 case? */
 838                         error = EISCONN;
 839                         goto release;
 840                 }
 841
 842                 /*
 843                  * Given we handle the v4mapped case in the INET block above
 844                  * assert here that it must not happen anymore.
 845                  */
 846                 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr),
 847                     ("%s: sin6(%p)->sin6_addr is v4mapped which we "
 848                     "should have handled.", __func__, sin6));
 849
 850                 /* This only requires read-locking. */
 851                 error = in6_selectsrc_socket(sin6, optp, inp,
 852                     td->td_ucred, scope_ambiguous, &in6a, NULL);
 853                 if (error)
 854                         goto release;
 855                 laddr = &in6a;
 856
 857                 if (inp->inp_lport == 0) {
 858                         struct inpcbinfo *pcbinfo;
 859
 860                         INP_WLOCK_ASSERT(inp);
 861
 862                         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 863                         INP_HASH_WLOCK(pcbinfo);
 864                         error = in6_pcbsetport(laddr, inp, td->td_ucred);
 865                         INP_HASH_WUNLOCK(pcbinfo);
 866                         if (error != 0) {
 867                                 /* Undo an address bind that may have occurred. */
 868                                 inp->in6p_laddr = in6addr_any;
 869                                 goto release;
 870                         }
 871                 }
 872                 faddr = &sin6->sin6_addr;
 873                 fport = sin6->sin6_port; /* allow 0 port */
 874
 875         } else {
 876                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 877                         error = ENOTCONN;
 878                         goto release;
 879                 }
 880                 laddr = &inp->in6p_laddr;
 881                 faddr = &inp->in6p_faddr;
 882                 fport = inp->inp_fport;
 883         }
 884
 885         ulen = m->m_pkthdr.len;
 886         plen = sizeof(struct udphdr) + ulen;
 887         hlen = sizeof(struct ip6_hdr);
 888
 889         /*
 890          * Calculate data length and get a mbuf
 891          * for UDP and IP6 headers.
 892          */
 893         M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
 894         if (m == NULL) {
 895                 error = ENOBUFS;
 896                 goto release;
 897         }
 898
 899         /*
 900          * Stuff checksum and output datagram.
 901          */
 902         cscov = cscov_partial = 0;
 903         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
 904         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
 905         udp6->uh_dport = fport;
 906         if (nxt == IPPROTO_UDPLITE) {
 907                 struct udpcb *up;
 908
 909                 up = intoudpcb(inp);
 910                 cscov = up->u_txcslen;
 911                 if (cscov >= plen)
 912                         cscov = 0;
 913                 udp6->uh_ulen = htons(cscov);
 914                 /*
 915                  * For UDP-Lite, checksum coverage length of zero means
 916                  * the entire UDPLite packet is covered by the checksum.
 917                  */
 918                 cscov_partial = (cscov == 0) ? 0 : 1;
 919         } else if (plen <= 0xffff)
 920                 udp6->uh_ulen = htons((u_short)plen);
 921         else
 922                 udp6->uh_ulen = 0;
 923         udp6->uh_sum = 0;
 924
 925         ip6 = mtod(m, struct ip6_hdr *);
 926         ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
 927         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
 928         ip6->ip6_vfc    |= IPV6_VERSION;
 929         ip6->ip6_plen   = htons((u_short)plen);
 930         ip6->ip6_nxt    = nxt;
 931         ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
 932         ip6->ip6_src    = *laddr;
 933         ip6->ip6_dst    = *faddr;
 934
 935 #ifdef MAC
 936         mac_inpcb_create_mbuf(inp, m);
 937 #endif
 938
 939         if (cscov_partial) {
 940                 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
 941                     sizeof(struct ip6_hdr), plen, cscov)) == 0)
 942                         udp6->uh_sum = 0xffff;
 943         } else {
 944                 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
 945                 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
 946                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
 947         }
 948
 949         flags = 0;
 950 #if defined(ROUTE_MPATH) || defined(RSS)
 951         if (CALC_FLOWID_OUTBOUND_SENDTO) {
 952                 uint32_t hash_type, hash_val;
 953                 uint8_t pr;
 954
 955                 pr = inp->inp_socket->so_proto->pr_protocol;
 956
 957                 hash_val = fib6_calc_packet_hash(laddr, faddr,
 958                     inp->inp_lport, fport, pr, &hash_type);
 959                 m->m_pkthdr.flowid = hash_val;
 960                 M_HASHTYPE_SET(m, hash_type);
 961         }
 962         /* do not use inp flowid */
 963         flags |= IP_NODEFAULTFLOWID;
 964 #endif
 965
 966         UDPSTAT_INC(udps_opackets);
 967         if (nxt == IPPROTO_UDPLITE)
 968                 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6);
 969         else
 970                 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
 971         error = ip6_output(m, optp,
 972             INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags,
 973             inp->in6p_moptions, NULL, inp);
 974         INP_UNLOCK(inp);
 975         NET_EPOCH_EXIT(et);
 976
 977         if (control) {
 978                 ip6_clearpktopts(&opt, -1);
 979                 m_freem(control);
 980         }
 981         return (error);
 982
 983 release:
 984         INP_UNLOCK(inp);
 985         NET_EPOCH_EXIT(et);
 986         if (control) {
 987                 ip6_clearpktopts(&opt, -1);
 988                 m_freem(control);
 989         }
 990         m_freem(m);
 991
 992         return (error);
 993 }
 994
 995 static void
 996 udp6_abort(struct socket *so)
 997 {
 998         struct inpcb *inp;
 999         struct inpcbinfo *pcbinfo;
1000
1001         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1002         inp = sotoinpcb(so);
1003         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
1004
1005         INP_WLOCK(inp);
1006 #ifdef INET
1007         if (inp->inp_vflag & INP_IPV4) {
1008                 struct pr_usrreqs *pru;
1009                 uint8_t nxt;
1010
1011                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1012                     IPPROTO_UDP : IPPROTO_UDPLITE;
1013                 INP_WUNLOCK(inp);
1014                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1015                 (*pru->pru_abort)(so);
1016                 return;
1017         }
1018 #endif
1019
1020         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1021                 INP_HASH_WLOCK(pcbinfo);
1022                 in6_pcbdisconnect(inp);
1023                 inp->in6p_laddr = in6addr_any;
1024                 INP_HASH_WUNLOCK(pcbinfo);
1025                 soisdisconnected(so);
1026         }
1027         INP_WUNLOCK(inp);
1028 }
1029
1030 static int
1031 udp6_attach(struct socket *so, int proto, struct thread *td)
1032 {
1033         struct inpcb *inp;
1034         struct inpcbinfo *pcbinfo;
1035         int error;
1036
1037         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1038         inp = sotoinpcb(so);
1039         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
1040
1041         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1042                 error = soreserve(so, udp_sendspace, udp_recvspace);
1043                 if (error)
1044                         return (error);
1045         }
1046         INP_INFO_WLOCK(pcbinfo);
1047         error = in_pcballoc(so, pcbinfo);
1048         if (error) {
1049                 INP_INFO_WUNLOCK(pcbinfo);
1050                 return (error);
1051         }
1052         inp = (struct inpcb *)so->so_pcb;
1053         inp->inp_vflag |= INP_IPV6;
1054         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
1055                 inp->inp_vflag |= INP_IPV4;
1056         inp->in6p_hops = -1;    /* use kernel default */
1057         inp->in6p_cksum = -1;   /* just to be sure */
1058         /*
1059          * XXX: ugly!!
1060          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
1061          * because the socket may be bound to an IPv6 wildcard address,
1062          * which may match an IPv4-mapped IPv6 address.
1063          */
1064         inp->inp_ip_ttl = V_ip_defttl;
1065
1066         error = udp_newudpcb(inp);
1067         if (error) {
1068                 in_pcbdetach(inp);
1069                 in_pcbfree(inp);
1070                 INP_INFO_WUNLOCK(pcbinfo);
1071                 return (error);
1072         }
1073         INP_WUNLOCK(inp);
1074         INP_INFO_WUNLOCK(pcbinfo);
1075         return (0);
1076 }
1077
1078 static int
1079 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1080 {
1081         struct inpcb *inp;
1082         struct inpcbinfo *pcbinfo;
1083         int error;
1084         u_char vflagsav;
1085
1086         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1087         inp = sotoinpcb(so);
1088         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1089
1090         if (nam->sa_family != AF_INET6)
1091                 return (EAFNOSUPPORT);
1092         if (nam->sa_len != sizeof(struct sockaddr_in6))
1093                 return (EINVAL);
1094
1095         INP_WLOCK(inp);
1096         INP_HASH_WLOCK(pcbinfo);
1097         vflagsav = inp->inp_vflag;
1098         inp->inp_vflag &= ~INP_IPV4;
1099         inp->inp_vflag |= INP_IPV6;
1100         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1101                 struct sockaddr_in6 *sin6_p;
1102
1103                 sin6_p = (struct sockaddr_in6 *)nam;
1104
1105                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1106                         inp->inp_vflag |= INP_IPV4;
1107 #ifdef INET
1108                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1109                         struct sockaddr_in sin;
1110
1111                         in6_sin6_2_sin(&sin, sin6_p);
1112                         inp->inp_vflag |= INP_IPV4;
1113                         inp->inp_vflag &= ~INP_IPV6;
1114                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
1115                             td->td_ucred);
1116                         goto out;
1117                 }
1118 #endif
1119         }
1120
1121         error = in6_pcbbind(inp, nam, td->td_ucred);
1122 #ifdef INET
1123 out:
1124 #endif
1125         if (error != 0)
1126                 inp->inp_vflag = vflagsav;
1127         INP_HASH_WUNLOCK(pcbinfo);
1128         INP_WUNLOCK(inp);
1129         return (error);
1130 }
1131
1132 static void
1133 udp6_close(struct socket *so)
1134 {
1135         struct inpcb *inp;
1136         struct inpcbinfo *pcbinfo;
1137
1138         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1139         inp = sotoinpcb(so);
1140         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1141
1142         INP_WLOCK(inp);
1143 #ifdef INET
1144         if (inp->inp_vflag & INP_IPV4) {
1145                 struct pr_usrreqs *pru;
1146                 uint8_t nxt;
1147
1148                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1149                     IPPROTO_UDP : IPPROTO_UDPLITE;
1150                 INP_WUNLOCK(inp);
1151                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1152                 (*pru->pru_disconnect)(so);
1153                 return;
1154         }
1155 #endif
1156         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1157                 INP_HASH_WLOCK(pcbinfo);
1158                 in6_pcbdisconnect(inp);
1159                 inp->in6p_laddr = in6addr_any;
1160                 INP_HASH_WUNLOCK(pcbinfo);
1161                 soisdisconnected(so);
1162         }
1163         INP_WUNLOCK(inp);
1164 }
1165
1166 static int
1167 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1168 {
1169 #ifdef INET
1170         struct epoch_tracker et;
1171 #endif
1172         struct inpcb *inp;
1173         struct inpcbinfo *pcbinfo;
1174         struct sockaddr_in6 *sin6;
1175         int error;
1176         u_char vflagsav;
1177
1178         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1179         inp = sotoinpcb(so);
1180         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1181
1182         sin6 = (struct sockaddr_in6 *)nam;
1183         if (sin6->sin6_family != AF_INET6)
1184                 return (EAFNOSUPPORT);
1185         if (sin6->sin6_len != sizeof(*sin6))
1186                 return (EINVAL);
1187
1188         /*
1189          * XXXRW: Need to clarify locking of v4/v6 flags.
1190          */
1191         INP_WLOCK(inp);
1192 #ifdef INET
1193         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1194                 struct sockaddr_in sin;
1195
1196                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1197                         error = EINVAL;
1198                         goto out;
1199                 }
1200                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1201                         error = EAFNOSUPPORT;
1202                         goto out;
1203                 }
1204                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1205                         error = EISCONN;
1206                         goto out;
1207                 }
1208                 in6_sin6_2_sin(&sin, sin6);
1209                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1210                 if (error != 0)
1211                         goto out;
1212                 vflagsav = inp->inp_vflag;
1213                 inp->inp_vflag |= INP_IPV4;
1214                 inp->inp_vflag &= ~INP_IPV6;
1215                 NET_EPOCH_ENTER(et);
1216                 INP_HASH_WLOCK(pcbinfo);
1217                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1218                     td->td_ucred);
1219                 INP_HASH_WUNLOCK(pcbinfo);
1220                 NET_EPOCH_EXIT(et);
1221                 /*
1222                  * If connect succeeds, mark socket as connected. If
1223                  * connect fails and socket is unbound, reset inp_vflag
1224                  * field.
1225                  */
1226                 if (error == 0)
1227                         soisconnected(so);
1228                 else if (inp->inp_laddr.s_addr == INADDR_ANY &&
1229                     inp->inp_lport == 0)
1230                         inp->inp_vflag = vflagsav;
1231                 goto out;
1232         } else {
1233                 if ((inp->inp_vflag & INP_IPV6) == 0) {
1234                         error = EAFNOSUPPORT;
1235                         goto out;
1236                 }
1237         }
1238 #endif
1239         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1240                 error = EISCONN;
1241                 goto out;
1242         }
1243         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1244         if (error != 0)
1245                 goto out;
1246         vflagsav = inp->inp_vflag;
1247         inp->inp_vflag &= ~INP_IPV4;
1248         inp->inp_vflag |= INP_IPV6;
1249         INP_HASH_WLOCK(pcbinfo);
1250         error = in6_pcbconnect(inp, nam, td->td_ucred);
1251         INP_HASH_WUNLOCK(pcbinfo);
1252         /*
1253          * If connect succeeds, mark socket as connected. If
1254          * connect fails and socket is unbound, reset inp_vflag
1255          * field.
1256          */
1257         if (error == 0)
1258                 soisconnected(so);
1259         else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1260             inp->inp_lport == 0)
1261                 inp->inp_vflag = vflagsav;
1262 out:
1263         INP_WUNLOCK(inp);
1264         return (error);
1265 }
1266
1267 static void
1268 udp6_detach(struct socket *so)
1269 {
1270         struct inpcb *inp;
1271         struct inpcbinfo *pcbinfo;
1272         struct udpcb *up;
1273
1274         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1275         inp = sotoinpcb(so);
1276         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1277
1278         INP_INFO_WLOCK(pcbinfo);
1279         INP_WLOCK(inp);
1280         up = intoudpcb(inp);
1281         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1282         in_pcbdetach(inp);
1283         in_pcbfree(inp);
1284         INP_INFO_WUNLOCK(pcbinfo);
1285         udp_discardcb(up);
1286 }
1287
1288 static int
1289 udp6_disconnect(struct socket *so)
1290 {
1291         struct inpcb *inp;
1292         struct inpcbinfo *pcbinfo;
1293
1294         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1295         inp = sotoinpcb(so);
1296         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1297
1298         INP_WLOCK(inp);
1299 #ifdef INET
1300         if (inp->inp_vflag & INP_IPV4) {
1301                 struct pr_usrreqs *pru;
1302                 uint8_t nxt;
1303
1304                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1305                     IPPROTO_UDP : IPPROTO_UDPLITE;
1306                 INP_WUNLOCK(inp);
1307                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1308                 (void)(*pru->pru_disconnect)(so);
1309                 return (0);
1310         }
1311 #endif
1312
1313         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1314                 INP_WUNLOCK(inp);
1315                 return (ENOTCONN);
1316         }
1317
1318         INP_HASH_WLOCK(pcbinfo);
1319         in6_pcbdisconnect(inp);
1320         inp->in6p_laddr = in6addr_any;
1321         INP_HASH_WUNLOCK(pcbinfo);
1322         SOCK_LOCK(so);
1323         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1324         SOCK_UNLOCK(so);
1325         INP_WUNLOCK(inp);
1326         return (0);
1327 }
1328
1329 static int
1330 udp6_send(struct socket *so, int flags, struct mbuf *m,
1331     struct sockaddr *addr, struct mbuf *control, struct thread *td)
1332 {
1333         int error;
1334
1335         if (addr) {
1336                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1337                         error = EINVAL;
1338                         goto bad;
1339                 }
1340                 if (addr->sa_family != AF_INET6) {
1341                         error = EAFNOSUPPORT;
1342                         goto bad;
1343                 }
1344         }
1345
1346         return (udp6_output(so, flags, m, addr, control, td));
1347
1348 bad:
1349         if (control)
1350                 m_freem(control);
1351         m_freem(m);
1352         return (error);
1353 }
1354
1355 struct pr_usrreqs udp6_usrreqs = {
1356         .pru_abort =            udp6_abort,
1357         .pru_attach =           udp6_attach,
1358         .pru_bind =             udp6_bind,
1359         .pru_connect =          udp6_connect,
1360         .pru_control =          in6_control,
1361         .pru_detach =           udp6_detach,
1362         .pru_disconnect =       udp6_disconnect,
1363         .pru_peeraddr =         in6_mapped_peeraddr,
1364         .pru_send =             udp6_send,
1365         .pru_shutdown =         udp_shutdown,
1366         .pru_sockaddr =         in6_mapped_sockaddr,
1367         .pru_soreceive =        soreceive_dgram,
1368         .pru_sosend =           sosend_dgram,
1369         .pru_sosetlabel =       in_pcbsosetlabel,
1370         .pru_close =            udp6_close
1371 };