sys/netinet6/udp6_usrreq.c

   1 /*-
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   4  * Copyright (c) 2014 Kevin Lo
   5  * All rights reserved.
   6  *
   7  * Portions of this software were developed by Robert N. M. Watson under
   8  * contract to Juniper Networks, Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the project nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
  35  *      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
  36  */
  37
  38 /*-
  39  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
  40  *      The Regents of the University of California.
  41  * All rights reserved.
  42  *
  43  * Redistribution and use in source and binary forms, with or without
  44  * modification, are permitted provided that the following conditions
  45  * are met:
  46  * 1. Redistributions of source code must retain the above copyright
  47  *    notice, this list of conditions and the following disclaimer.
  48  * 2. Redistributions in binary form must reproduce the above copyright
  49  *    notice, this list of conditions and the following disclaimer in the
  50  *    documentation and/or other materials provided with the distribution.
  51  * 4. Neither the name of the University nor the names of its contributors
  52  *    may be used to endorse or promote products derived from this software
  53  *    without specific prior written permission.
  54  *
  55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  65  * SUCH DAMAGE.
  66  *
  67  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  68  */
  69
  70 #include <sys/cdefs.h>
  71 __FBSDID("$FreeBSD$");
  72
  73 #include "opt_inet.h"
  74 #include "opt_inet6.h"
  75 #include "opt_ipsec.h"
  76 #include "opt_rss.h"
  77
  78 #include <sys/param.h>
  79 #include <sys/jail.h>
  80 #include <sys/kernel.h>
  81 #include <sys/lock.h>
  82 #include <sys/mbuf.h>
  83 #include <sys/priv.h>
  84 #include <sys/proc.h>
  85 #include <sys/protosw.h>
  86 #include <sys/sdt.h>
  87 #include <sys/signalvar.h>
  88 #include <sys/socket.h>
  89 #include <sys/socketvar.h>
  90 #include <sys/sx.h>
  91 #include <sys/sysctl.h>
  92 #include <sys/syslog.h>
  93 #include <sys/systm.h>
  94
  95 #include <net/if.h>
  96 #include <net/if_var.h>
  97 #include <net/if_types.h>
  98 #include <net/route.h>
  99 #include <net/rss_config.h>
 100
 101 #include <netinet/in.h>
 102 #include <netinet/in_kdtrace.h>
 103 #include <netinet/in_pcb.h>
 104 #include <netinet/in_systm.h>
 105 #include <netinet/in_var.h>
 106 #include <netinet/ip.h>
 107 #include <netinet/ip6.h>
 108 #include <netinet/icmp6.h>
 109 #include <netinet/ip_var.h>
 110 #include <netinet/udp.h>
 111 #include <netinet/udp_var.h>
 112 #include <netinet/udplite.h>
 113
 114 #include <netinet6/ip6protosw.h>
 115 #include <netinet6/ip6_var.h>
 116 #include <netinet6/in6_pcb.h>
 117 #include <netinet6/in6_rss.h>
 118 #include <netinet6/udp6_var.h>
 119 #include <netinet6/scope6_var.h>
 120
 121 #include <netipsec/ipsec_support.h>
 122
 123 #include <security/mac/mac_framework.h>
 124
 125 /*
 126  * UDP protocol implementation.
 127  * Per RFC 768, August, 1980.
 128  */
 129
 130 extern struct protosw   inetsw[];
 131 static void             udp6_detach(struct socket *so);
 132
 133 static int
 134 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
 135     struct sockaddr_in6 *fromsa)
 136 {
 137         struct socket *so;
 138         struct mbuf *opts;
 139         struct udpcb *up;
 140
 141         INP_LOCK_ASSERT(inp);
 142
 143         /*
 144          * Engage the tunneling protocol.
 145          */
 146         up = intoudpcb(inp);
 147         if (up->u_tun_func != NULL) {
 148                 in_pcbref(inp);
 149                 INP_RUNLOCK(inp);
 150                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa,
 151                     up->u_tun_ctx);
 152                 INP_RLOCK(inp);
 153                 return (in_pcbrele_rlocked(inp));
 154         }
 155 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 156         /* Check AH/ESP integrity. */
 157         if (IPSEC_ENABLED(ipv6)) {
 158                 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) {
 159                         m_freem(n);
 160                         return (0);
 161                 }
 162         }
 163 #endif /* IPSEC */
 164 #ifdef MAC
 165         if (mac_inpcb_check_deliver(inp, n) != 0) {
 166                 m_freem(n);
 167                 return (0);
 168         }
 169 #endif
 170         opts = NULL;
 171         if (inp->inp_flags & INP_CONTROLOPTS ||
 172             inp->inp_socket->so_options & SO_TIMESTAMP)
 173                 ip6_savecontrol(inp, n, &opts);
 174         m_adj(n, off + sizeof(struct udphdr));
 175
 176         so = inp->inp_socket;
 177         SOCKBUF_LOCK(&so->so_rcv);
 178         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
 179             opts) == 0) {
 180                 SOCKBUF_UNLOCK(&so->so_rcv);
 181                 m_freem(n);
 182                 if (opts)
 183                         m_freem(opts);
 184                 UDPSTAT_INC(udps_fullsock);
 185         } else
 186                 sorwakeup_locked(so);
 187         return (0);
 188 }
 189
 190 int
 191 udp6_input(struct mbuf **mp, int *offp, int proto)
 192 {
 193         struct mbuf *m = *mp;
 194         struct ifnet *ifp;
 195         struct ip6_hdr *ip6;
 196         struct udphdr *uh;
 197         struct inpcb *inp;
 198         struct inpcbinfo *pcbinfo;
 199         struct udpcb *up;
 200         int off = *offp;
 201         int cscov_partial;
 202         int plen, ulen;
 203         struct sockaddr_in6 fromsa;
 204         struct m_tag *fwd_tag;
 205         uint16_t uh_sum;
 206         uint8_t nxt;
 207
 208         ifp = m->m_pkthdr.rcvif;
 209
 210 #ifndef PULLDOWN_TEST
 211         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 212         ip6 = mtod(m, struct ip6_hdr *);
 213         uh = (struct udphdr *)((caddr_t)ip6 + off);
 214 #else
 215         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
 216         if (!uh)
 217                 return (IPPROTO_DONE);
 218         ip6 = mtod(m, struct ip6_hdr *);
 219 #endif
 220
 221         UDPSTAT_INC(udps_ipackets);
 222
 223         /*
 224          * Destination port of 0 is illegal, based on RFC768.
 225          */
 226         if (uh->uh_dport == 0)
 227                 goto badunlocked;
 228
 229         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 230         ulen = ntohs((u_short)uh->uh_ulen);
 231
 232         nxt = proto;
 233         cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
 234         if (nxt == IPPROTO_UDPLITE) {
 235                 /* Zero means checksum over the complete packet. */
 236                 if (ulen == 0)
 237                         ulen = plen;
 238                 if (ulen == plen)
 239                         cscov_partial = 0;
 240                 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
 241                         /* XXX: What is the right UDPLite MIB counter? */
 242                         goto badunlocked;
 243                 }
 244                 if (uh->uh_sum == 0) {
 245                         /* XXX: What is the right UDPLite MIB counter? */
 246                         goto badunlocked;
 247                 }
 248         } else {
 249                 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
 250                         UDPSTAT_INC(udps_badlen);
 251                         goto badunlocked;
 252                 }
 253                 if (uh->uh_sum == 0) {
 254                         UDPSTAT_INC(udps_nosum);
 255                         goto badunlocked;
 256                 }
 257         }
 258
 259         if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
 260             !cscov_partial) {
 261                 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 262                         uh_sum = m->m_pkthdr.csum_data;
 263                 else
 264                         uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
 265                             m->m_pkthdr.csum_data);
 266                 uh_sum ^= 0xffff;
 267         } else
 268                 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
 269
 270         if (uh_sum != 0) {
 271                 UDPSTAT_INC(udps_badsum);
 272                 goto badunlocked;
 273         }
 274
 275         /*
 276          * Construct sockaddr format source address.
 277          */
 278         init_sin6(&fromsa, m);
 279         fromsa.sin6_port = uh->uh_sport;
 280
 281         pcbinfo = udp_get_inpcbinfo(nxt);
 282         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 283                 struct inpcb *last;
 284                 struct inpcbhead *pcblist;
 285                 struct ip6_moptions *imo;
 286
 287                 INP_INFO_RLOCK(pcbinfo);
 288                 /*
 289                  * In the event that laddr should be set to the link-local
 290                  * address (this happens in RIPng), the multicast address
 291                  * specified in the received packet will not match laddr.  To
 292                  * handle this situation, matching is relaxed if the
 293                  * receiving interface is the same as one specified in the
 294                  * socket and if the destination multicast address matches
 295                  * one of the multicast groups specified in the socket.
 296                  */
 297
 298                 /*
 299                  * KAME note: traditionally we dropped udpiphdr from mbuf
 300                  * here.  We need udphdr for IPsec processing so we do that
 301                  * later.
 302                  */
 303                 pcblist = udp_get_pcblist(nxt);
 304                 last = NULL;
 305                 LIST_FOREACH(inp, pcblist, inp_list) {
 306                         if ((inp->inp_vflag & INP_IPV6) == 0)
 307                                 continue;
 308                         if (inp->inp_lport != uh->uh_dport)
 309                                 continue;
 310                         if (inp->inp_fport != 0 &&
 311                             inp->inp_fport != uh->uh_sport)
 312                                 continue;
 313                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 314                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 315                                                         &ip6->ip6_dst))
 316                                         continue;
 317                         }
 318                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 319                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 320                                                         &ip6->ip6_src) ||
 321                                     inp->inp_fport != uh->uh_sport)
 322                                         continue;
 323                         }
 324
 325                         /*
 326                          * XXXRW: Because we weren't holding either the inpcb
 327                          * or the hash lock when we checked for a match
 328                          * before, we should probably recheck now that the
 329                          * inpcb lock is (supposed to be) held.
 330                          */
 331
 332                         /*
 333                          * Handle socket delivery policy for any-source
 334                          * and source-specific multicast. [RFC3678]
 335                          */
 336                         imo = inp->in6p_moptions;
 337                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 338                                 struct sockaddr_in6      mcaddr;
 339                                 int                      blocked;
 340
 341                                 INP_RLOCK(inp);
 342
 343                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
 344                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
 345                                 mcaddr.sin6_family = AF_INET6;
 346                                 mcaddr.sin6_addr = ip6->ip6_dst;
 347
 348                                 blocked = im6o_mc_filter(imo, ifp,
 349                                         (struct sockaddr *)&mcaddr,
 350                                         (struct sockaddr *)&fromsa);
 351                                 if (blocked != MCAST_PASS) {
 352                                         if (blocked == MCAST_NOTGMEMBER)
 353                                                 IP6STAT_INC(ip6s_notmember);
 354                                         if (blocked == MCAST_NOTSMEMBER ||
 355                                             blocked == MCAST_MUTED)
 356                                                 UDPSTAT_INC(udps_filtermcast);
 357                                         INP_RUNLOCK(inp); /* XXX */
 358                                         continue;
 359                                 }
 360
 361                                 INP_RUNLOCK(inp);
 362                         }
 363                         if (last != NULL) {
 364                                 struct mbuf *n;
 365
 366                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 367                                         INP_RLOCK(last);
 368                                         UDP_PROBE(receive, NULL, last, ip6,
 369                                             last, uh);
 370                                         if (udp6_append(last, n, off, &fromsa))
 371                                                 goto inp_lost;
 372                                         INP_RUNLOCK(last);
 373                                 }
 374                         }
 375                         last = inp;
 376                         /*
 377                          * Don't look for additional matches if this one does
 378                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 379                          * socket options set.  This heuristic avoids
 380                          * searching through all pcbs in the common case of a
 381                          * non-shared port.  It assumes that an application
 382                          * will never clear these options after setting them.
 383                          */
 384                         if ((last->inp_socket->so_options &
 385                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 386                                 break;
 387                 }
 388
 389                 if (last == NULL) {
 390                         /*
 391                          * No matching pcb found; discard datagram.  (No need
 392                          * to send an ICMP Port Unreachable for a broadcast
 393                          * or multicast datgram.)
 394                          */
 395                         UDPSTAT_INC(udps_noport);
 396                         UDPSTAT_INC(udps_noportmcast);
 397                         goto badheadlocked;
 398                 }
 399                 INP_RLOCK(last);
 400                 INP_INFO_RUNLOCK(pcbinfo);
 401                 UDP_PROBE(receive, NULL, last, ip6, last, uh);
 402                 if (udp6_append(last, m, off, &fromsa) == 0)
 403                         INP_RUNLOCK(last);
 404         inp_lost:
 405                 return (IPPROTO_DONE);
 406         }
 407         /*
 408          * Locate pcb for datagram.
 409          */
 410
 411         /*
 412          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 413          */
 414         if ((m->m_flags & M_IP6_NEXTHOP) &&
 415             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 416                 struct sockaddr_in6 *next_hop6;
 417
 418                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
 419
 420                 /*
 421                  * Transparently forwarded. Pretend to be the destination.
 422                  * Already got one like this?
 423                  */
 424                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 425                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 426                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
 427                 if (!inp) {
 428                         /*
 429                          * It's new.  Try to find the ambushing socket.
 430                          * Because we've rewritten the destination address,
 431                          * any hardware-generated hash is ignored.
 432                          */
 433                         inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
 434                             uh->uh_sport, &next_hop6->sin6_addr,
 435                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
 436                             uh->uh_dport, INPLOOKUP_WILDCARD |
 437                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
 438                 }
 439                 /* Remove the tag from the packet. We don't need it anymore. */
 440                 m_tag_delete(m, fwd_tag);
 441                 m->m_flags &= ~M_IP6_NEXTHOP;
 442         } else
 443                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
 444                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
 445                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 446                     m->m_pkthdr.rcvif, m);
 447         if (inp == NULL) {
 448                 if (udp_log_in_vain) {
 449                         char ip6bufs[INET6_ADDRSTRLEN];
 450                         char ip6bufd[INET6_ADDRSTRLEN];
 451
 452                         log(LOG_INFO,
 453                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 454                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 455                             ntohs(uh->uh_dport),
 456                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 457                             ntohs(uh->uh_sport));
 458                 }
 459                 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh);
 460                 UDPSTAT_INC(udps_noport);
 461                 if (m->m_flags & M_MCAST) {
 462                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 463                         UDPSTAT_INC(udps_noportmcast);
 464                         goto badunlocked;
 465                 }
 466                 if (V_udp_blackhole)
 467                         goto badunlocked;
 468                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 469                 return (IPPROTO_DONE);
 470         }
 471         INP_RLOCK_ASSERT(inp);
 472         up = intoudpcb(inp);
 473         if (cscov_partial) {
 474                 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
 475                         INP_RUNLOCK(inp);
 476                         m_freem(m);
 477                         return (IPPROTO_DONE);
 478                 }
 479         }
 480         UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
 481         if (udp6_append(inp, m, off, &fromsa) == 0)
 482                 INP_RUNLOCK(inp);
 483         return (IPPROTO_DONE);
 484
 485 badheadlocked:
 486         INP_INFO_RUNLOCK(pcbinfo);
 487 badunlocked:
 488         if (m)
 489                 m_freem(m);
 490         return (IPPROTO_DONE);
 491 }
 492
 493 static void
 494 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
 495     struct inpcbinfo *pcbinfo)
 496 {
 497         struct udphdr uh;
 498         struct ip6_hdr *ip6;
 499         struct mbuf *m;
 500         int off = 0;
 501         struct ip6ctlparam *ip6cp = NULL;
 502         const struct sockaddr_in6 *sa6_src = NULL;
 503         void *cmdarg;
 504         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
 505         struct udp_portonly {
 506                 u_int16_t uh_sport;
 507                 u_int16_t uh_dport;
 508         } *uhp;
 509
 510         if (sa->sa_family != AF_INET6 ||
 511             sa->sa_len != sizeof(struct sockaddr_in6))
 512                 return;
 513
 514         if ((unsigned)cmd >= PRC_NCMDS)
 515                 return;
 516         if (PRC_IS_REDIRECT(cmd))
 517                 notify = in6_rtchange, d = NULL;
 518         else if (cmd == PRC_HOSTDEAD)
 519                 d = NULL;
 520         else if (inet6ctlerrmap[cmd] == 0)
 521                 return;
 522
 523         /* if the parameter is from icmp6, decode it. */
 524         if (d != NULL) {
 525                 ip6cp = (struct ip6ctlparam *)d;
 526                 m = ip6cp->ip6c_m;
 527                 ip6 = ip6cp->ip6c_ip6;
 528                 off = ip6cp->ip6c_off;
 529                 cmdarg = ip6cp->ip6c_cmdarg;
 530                 sa6_src = ip6cp->ip6c_src;
 531         } else {
 532                 m = NULL;
 533                 ip6 = NULL;
 534                 cmdarg = NULL;
 535                 sa6_src = &sa6_any;
 536         }
 537
 538         if (ip6) {
 539                 /*
 540                  * XXX: We assume that when IPV6 is non NULL,
 541                  * M and OFF are valid.
 542                  */
 543
 544                 /* Check if we can safely examine src and dst ports. */
 545                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 546                         return;
 547
 548                 bzero(&uh, sizeof(uh));
 549                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 550
 551                 if (!PRC_IS_REDIRECT(cmd)) {
 552                         /* Check to see if its tunneled */
 553                         struct inpcb *inp;
 554                         inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
 555                             uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
 556                             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
 557                             m->m_pkthdr.rcvif, m);
 558                         if (inp != NULL) {
 559                                 struct udpcb *up;
 560
 561                                 up = intoudpcb(inp);
 562                                 if (up->u_icmp_func) {
 563                                         /* Yes it is. */
 564                                         INP_RUNLOCK(inp);
 565                                         (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
 566                                               d, up->u_tun_ctx);
 567                                         return;
 568                                 } else {
 569                                         /* Can't find it. */
 570                                         INP_RUNLOCK(inp);
 571                                 }
 572                         }
 573                 }
 574                 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
 575                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
 576                     cmdarg, notify);
 577         } else
 578                 (void)in6_pcbnotify(pcbinfo, sa, 0,
 579                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
 580 }
 581
 582 void
 583 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 584 {
 585
 586         return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
 587 }
 588
 589 void
 590 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 591 {
 592
 593         return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
 594 }
 595
 596 static int
 597 udp6_getcred(SYSCTL_HANDLER_ARGS)
 598 {
 599         struct xucred xuc;
 600         struct sockaddr_in6 addrs[2];
 601         struct inpcb *inp;
 602         int error;
 603
 604         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 605         if (error)
 606                 return (error);
 607
 608         if (req->newlen != sizeof(addrs))
 609                 return (EINVAL);
 610         if (req->oldlen != sizeof(struct xucred))
 611                 return (EINVAL);
 612         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 613         if (error)
 614                 return (error);
 615         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
 616             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
 617                 return (error);
 618         }
 619         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
 620             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
 621             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 622         if (inp != NULL) {
 623                 INP_RLOCK_ASSERT(inp);
 624                 if (inp->inp_socket == NULL)
 625                         error = ENOENT;
 626                 if (error == 0)
 627                         error = cr_canseesocket(req->td->td_ucred,
 628                             inp->inp_socket);
 629                 if (error == 0)
 630                         cru2x(inp->inp_cred, &xuc);
 631                 INP_RUNLOCK(inp);
 632         } else
 633                 error = ENOENT;
 634         if (error == 0)
 635                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 636         return (error);
 637 }
 638
 639 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
 640     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
 641
 642 static int
 643 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
 644     struct mbuf *control, struct thread *td)
 645 {
 646         u_int32_t ulen = m->m_pkthdr.len;
 647         u_int32_t plen = sizeof(struct udphdr) + ulen;
 648         struct ip6_hdr *ip6;
 649         struct udphdr *udp6;
 650         struct in6_addr *laddr, *faddr, in6a;
 651         struct sockaddr_in6 *sin6 = NULL;
 652         int cscov_partial = 0;
 653         int scope_ambiguous = 0;
 654         u_short fport;
 655         int error = 0;
 656         uint8_t nxt;
 657         uint16_t cscov = 0;
 658         struct ip6_pktopts *optp, opt;
 659         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
 660         int flags;
 661         struct sockaddr_in6 tmp;
 662
 663         INP_WLOCK_ASSERT(inp);
 664         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 665
 666         if (addr6) {
 667                 /* addr6 has been validated in udp6_send(). */
 668                 sin6 = (struct sockaddr_in6 *)addr6;
 669
 670                 /* protect *sin6 from overwrites */
 671                 tmp = *sin6;
 672                 sin6 = &tmp;
 673
 674                 /*
 675                  * Application should provide a proper zone ID or the use of
 676                  * default zone IDs should be enabled.  Unfortunately, some
 677                  * applications do not behave as it should, so we need a
 678                  * workaround.  Even if an appropriate ID is not determined,
 679                  * we'll see if we can determine the outgoing interface.  If we
 680                  * can, determine the zone ID based on the interface below.
 681                  */
 682                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
 683                         scope_ambiguous = 1;
 684                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 685                         return (error);
 686         }
 687
 688         nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 689             IPPROTO_UDP : IPPROTO_UDPLITE;
 690         if (control) {
 691                 if ((error = ip6_setpktopts(control, &opt,
 692                     inp->in6p_outputopts, td->td_ucred, nxt)) != 0)
 693                         goto release;
 694                 optp = &opt;
 695         } else
 696                 optp = inp->in6p_outputopts;
 697
 698         if (sin6) {
 699                 faddr = &sin6->sin6_addr;
 700
 701                 /*
 702                  * Since we saw no essential reason for calling in_pcbconnect,
 703                  * we get rid of such kind of logic, and call in6_selectsrc
 704                  * and in6_pcbsetport in order to fill in the local address
 705                  * and the local port.
 706                  */
 707                 if (sin6->sin6_port == 0) {
 708                         error = EADDRNOTAVAIL;
 709                         goto release;
 710                 }
 711
 712                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 713                         /* how about ::ffff:0.0.0.0 case? */
 714                         error = EISCONN;
 715                         goto release;
 716                 }
 717
 718                 fport = sin6->sin6_port; /* allow 0 port */
 719
 720                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
 721                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 722                                 /*
 723                                  * I believe we should explicitly discard the
 724                                  * packet when mapped addresses are disabled,
 725                                  * rather than send the packet as an IPv6 one.
 726                                  * If we chose the latter approach, the packet
 727                                  * might be sent out on the wire based on the
 728                                  * default route, the situation which we'd
 729                                  * probably want to avoid.
 730                                  * (20010421 jinmei@kame.net)
 731                                  */
 732                                 error = EINVAL;
 733                                 goto release;
 734                         }
 735                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
 736                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
 737                                 /*
 738                                  * when remote addr is an IPv4-mapped address,
 739                                  * local addr should not be an IPv6 address,
 740                                  * since you cannot determine how to map IPv6
 741                                  * source address to IPv4.
 742                                  */
 743                                 error = EINVAL;
 744                                 goto release;
 745                         }
 746
 747                         af = AF_INET;
 748                 }
 749
 750                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
 751                         error = in6_selectsrc_socket(sin6, optp, inp,
 752                             td->td_ucred, scope_ambiguous, &in6a, NULL);
 753                         if (error)
 754                                 goto release;
 755                         laddr = &in6a;
 756                 } else
 757                         laddr = &inp->in6p_laddr;       /* XXX */
 758                 if (laddr == NULL) {
 759                         if (error == 0)
 760                                 error = EADDRNOTAVAIL;
 761                         goto release;
 762                 }
 763                 if (inp->inp_lport == 0 &&
 764                     (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
 765                         /* Undo an address bind that may have occurred. */
 766                         inp->in6p_laddr = in6addr_any;
 767                         goto release;
 768                 }
 769         } else {
 770                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 771                         error = ENOTCONN;
 772                         goto release;
 773                 }
 774                 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
 775                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 776                                 /*
 777                                  * XXX: this case would happen when the
 778                                  * application sets the V6ONLY flag after
 779                                  * connecting the foreign address.
 780                                  * Such applications should be fixed,
 781                                  * so we bark here.
 782                                  */
 783                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
 784                                     "option was set for a connected socket\n");
 785                                 error = EINVAL;
 786                                 goto release;
 787                         } else
 788                                 af = AF_INET;
 789                 }
 790                 laddr = &inp->in6p_laddr;
 791                 faddr = &inp->in6p_faddr;
 792                 fport = inp->inp_fport;
 793         }
 794
 795         if (af == AF_INET)
 796                 hlen = sizeof(struct ip);
 797
 798         /*
 799          * Calculate data length and get a mbuf
 800          * for UDP and IP6 headers.
 801          */
 802         M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
 803         if (m == NULL) {
 804                 error = ENOBUFS;
 805                 goto release;
 806         }
 807
 808         /*
 809          * Stuff checksum and output datagram.
 810          */
 811         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
 812         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
 813         udp6->uh_dport = fport;
 814         if (nxt == IPPROTO_UDPLITE) {
 815                 struct udpcb *up;
 816
 817                 up = intoudpcb(inp);
 818                 cscov = up->u_txcslen;
 819                 if (cscov >= plen)
 820                         cscov = 0;
 821                 udp6->uh_ulen = htons(cscov);
 822                 /*
 823                  * For UDP-Lite, checksum coverage length of zero means
 824                  * the entire UDPLite packet is covered by the checksum.
 825                  */
 826                 cscov_partial = (cscov == 0) ? 0 : 1;
 827         } else if (plen <= 0xffff)
 828                 udp6->uh_ulen = htons((u_short)plen);
 829         else
 830                 udp6->uh_ulen = 0;
 831         udp6->uh_sum = 0;
 832
 833         switch (af) {
 834         case AF_INET6:
 835                 ip6 = mtod(m, struct ip6_hdr *);
 836                 ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
 837                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
 838                 ip6->ip6_vfc    |= IPV6_VERSION;
 839                 ip6->ip6_plen   = htons((u_short)plen);
 840                 ip6->ip6_nxt    = nxt;
 841                 ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
 842                 ip6->ip6_src    = *laddr;
 843                 ip6->ip6_dst    = *faddr;
 844
 845                 if (cscov_partial) {
 846                         if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
 847                             sizeof(struct ip6_hdr), plen, cscov)) == 0)
 848                                 udp6->uh_sum = 0xffff;
 849                 } else {
 850                         udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
 851                         m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
 852                         m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
 853                 }
 854
 855 #ifdef  RSS
 856                 {
 857                         uint32_t hash_val, hash_type;
 858                         uint8_t pr;
 859
 860                         pr = inp->inp_socket->so_proto->pr_protocol;
 861                         /*
 862                          * Calculate an appropriate RSS hash for UDP and
 863                          * UDP Lite.
 864                          *
 865                          * The called function will take care of figuring out
 866                          * whether a 2-tuple or 4-tuple hash is required based
 867                          * on the currently configured scheme.
 868                          *
 869                          * Later later on connected socket values should be
 870                          * cached in the inpcb and reused, rather than constantly
 871                          * re-calculating it.
 872                          *
 873                          * UDP Lite is a different protocol number and will
 874                          * likely end up being hashed as a 2-tuple until
 875                          * RSS / NICs grow UDP Lite protocol awareness.
 876                          */
 877                         if (rss_proto_software_hash_v6(faddr, laddr, fport,
 878                             inp->inp_lport, pr, &hash_val, &hash_type) == 0) {
 879                                 m->m_pkthdr.flowid = hash_val;
 880                                 M_HASHTYPE_SET(m, hash_type);
 881                         }
 882                 }
 883 #endif
 884                 flags = 0;
 885 #ifdef  RSS
 886                 /*
 887                  * Don't override with the inp cached flowid.
 888                  *
 889                  * Until the whole UDP path is vetted, it may actually
 890                  * be incorrect.
 891                  */
 892                 flags |= IP_NODEFAULTFLOWID;
 893 #endif
 894
 895                 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
 896                 UDPSTAT_INC(udps_opackets);
 897                 error = ip6_output(m, optp, &inp->inp_route6, flags,
 898                     inp->in6p_moptions, NULL, inp);
 899                 break;
 900         case AF_INET:
 901                 error = EAFNOSUPPORT;
 902                 goto release;
 903         }
 904         goto releaseopt;
 905
 906 release:
 907         m_freem(m);
 908
 909 releaseopt:
 910         if (control) {
 911                 ip6_clearpktopts(&opt, -1);
 912                 m_freem(control);
 913         }
 914         return (error);
 915 }
 916
 917 static void
 918 udp6_abort(struct socket *so)
 919 {
 920         struct inpcb *inp;
 921         struct inpcbinfo *pcbinfo;
 922
 923         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 924         inp = sotoinpcb(so);
 925         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
 926
 927         INP_WLOCK(inp);
 928 #ifdef INET
 929         if (inp->inp_vflag & INP_IPV4) {
 930                 struct pr_usrreqs *pru;
 931                 uint8_t nxt;
 932
 933                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 934                     IPPROTO_UDP : IPPROTO_UDPLITE;
 935                 INP_WUNLOCK(inp);
 936                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
 937                 (*pru->pru_abort)(so);
 938                 return;
 939         }
 940 #endif
 941
 942         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 943                 INP_HASH_WLOCK(pcbinfo);
 944                 in6_pcbdisconnect(inp);
 945                 inp->in6p_laddr = in6addr_any;
 946                 INP_HASH_WUNLOCK(pcbinfo);
 947                 soisdisconnected(so);
 948         }
 949         INP_WUNLOCK(inp);
 950 }
 951
 952 static int
 953 udp6_attach(struct socket *so, int proto, struct thread *td)
 954 {
 955         struct inpcb *inp;
 956         struct inpcbinfo *pcbinfo;
 957         int error;
 958
 959         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 960         inp = sotoinpcb(so);
 961         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
 962
 963         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 964                 error = soreserve(so, udp_sendspace, udp_recvspace);
 965                 if (error)
 966                         return (error);
 967         }
 968         INP_INFO_WLOCK(pcbinfo);
 969         error = in_pcballoc(so, pcbinfo);
 970         if (error) {
 971                 INP_INFO_WUNLOCK(pcbinfo);
 972                 return (error);
 973         }
 974         inp = (struct inpcb *)so->so_pcb;
 975         inp->inp_vflag |= INP_IPV6;
 976         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 977                 inp->inp_vflag |= INP_IPV4;
 978         inp->in6p_hops = -1;    /* use kernel default */
 979         inp->in6p_cksum = -1;   /* just to be sure */
 980         /*
 981          * XXX: ugly!!
 982          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 983          * because the socket may be bound to an IPv6 wildcard address,
 984          * which may match an IPv4-mapped IPv6 address.
 985          */
 986         inp->inp_ip_ttl = V_ip_defttl;
 987
 988         error = udp_newudpcb(inp);
 989         if (error) {
 990                 in_pcbdetach(inp);
 991                 in_pcbfree(inp);
 992                 INP_INFO_WUNLOCK(pcbinfo);
 993                 return (error);
 994         }
 995         INP_WUNLOCK(inp);
 996         INP_INFO_WUNLOCK(pcbinfo);
 997         return (0);
 998 }
 999
1000 static int
1001 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1002 {
1003         struct inpcb *inp;
1004         struct inpcbinfo *pcbinfo;
1005         int error;
1006         u_char vflagsav;
1007
1008         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1009         inp = sotoinpcb(so);
1010         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1011
1012         INP_WLOCK(inp);
1013         INP_HASH_WLOCK(pcbinfo);
1014         vflagsav = inp->inp_vflag;
1015         inp->inp_vflag &= ~INP_IPV4;
1016         inp->inp_vflag |= INP_IPV6;
1017         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1018                 struct sockaddr_in6 *sin6_p;
1019
1020                 sin6_p = (struct sockaddr_in6 *)nam;
1021
1022                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1023                         inp->inp_vflag |= INP_IPV4;
1024 #ifdef INET
1025                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1026                         struct sockaddr_in sin;
1027
1028                         in6_sin6_2_sin(&sin, sin6_p);
1029                         inp->inp_vflag |= INP_IPV4;
1030                         inp->inp_vflag &= ~INP_IPV6;
1031                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
1032                             td->td_ucred);
1033                         goto out;
1034                 }
1035 #endif
1036         }
1037
1038         error = in6_pcbbind(inp, nam, td->td_ucred);
1039 #ifdef INET
1040 out:
1041 #endif
1042         if (error != 0)
1043                 inp->inp_vflag = vflagsav;
1044         INP_HASH_WUNLOCK(pcbinfo);
1045         INP_WUNLOCK(inp);
1046         return (error);
1047 }
1048
1049 static void
1050 udp6_close(struct socket *so)
1051 {
1052         struct inpcb *inp;
1053         struct inpcbinfo *pcbinfo;
1054
1055         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1056         inp = sotoinpcb(so);
1057         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1058
1059         INP_WLOCK(inp);
1060 #ifdef INET
1061         if (inp->inp_vflag & INP_IPV4) {
1062                 struct pr_usrreqs *pru;
1063                 uint8_t nxt;
1064
1065                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1066                     IPPROTO_UDP : IPPROTO_UDPLITE;
1067                 INP_WUNLOCK(inp);
1068                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1069                 (*pru->pru_disconnect)(so);
1070                 return;
1071         }
1072 #endif
1073         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1074                 INP_HASH_WLOCK(pcbinfo);
1075                 in6_pcbdisconnect(inp);
1076                 inp->in6p_laddr = in6addr_any;
1077                 INP_HASH_WUNLOCK(pcbinfo);
1078                 soisdisconnected(so);
1079         }
1080         INP_WUNLOCK(inp);
1081 }
1082
1083 static int
1084 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1085 {
1086         struct inpcb *inp;
1087         struct inpcbinfo *pcbinfo;
1088         struct sockaddr_in6 *sin6;
1089         int error;
1090         u_char vflagsav;
1091
1092         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1093         inp = sotoinpcb(so);
1094         sin6 = (struct sockaddr_in6 *)nam;
1095         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1096
1097         /*
1098          * XXXRW: Need to clarify locking of v4/v6 flags.
1099          */
1100         INP_WLOCK(inp);
1101 #ifdef INET
1102         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1103                 struct sockaddr_in sin;
1104
1105                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1106                         error = EINVAL;
1107                         goto out;
1108                 }
1109                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1110                         error = EAFNOSUPPORT;
1111                         goto out;
1112                 }
1113                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1114                         error = EISCONN;
1115                         goto out;
1116                 }
1117                 in6_sin6_2_sin(&sin, sin6);
1118                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1119                 if (error != 0)
1120                         goto out;
1121                 vflagsav = inp->inp_vflag;
1122                 inp->inp_vflag |= INP_IPV4;
1123                 inp->inp_vflag &= ~INP_IPV6;
1124                 INP_HASH_WLOCK(pcbinfo);
1125                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1126                     td->td_ucred);
1127                 INP_HASH_WUNLOCK(pcbinfo);
1128                 /*
1129                  * If connect succeeds, mark socket as connected. If
1130                  * connect fails and socket is unbound, reset inp_vflag
1131                  * field.
1132                  */
1133                 if (error == 0)
1134                         soisconnected(so);
1135                 else if (inp->inp_laddr.s_addr == INADDR_ANY &&
1136                     inp->inp_lport == 0)
1137                         inp->inp_vflag = vflagsav;
1138                 goto out;
1139         } else {
1140                 if ((inp->inp_vflag & INP_IPV6) == 0) {
1141                         error = EAFNOSUPPORT;
1142                         goto out;
1143                 }
1144         }
1145 #endif
1146         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1147                 error = EISCONN;
1148                 goto out;
1149         }
1150         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1151         if (error != 0)
1152                 goto out;
1153         vflagsav = inp->inp_vflag;
1154         inp->inp_vflag &= ~INP_IPV4;
1155         inp->inp_vflag |= INP_IPV6;
1156         INP_HASH_WLOCK(pcbinfo);
1157         error = in6_pcbconnect(inp, nam, td->td_ucred);
1158         INP_HASH_WUNLOCK(pcbinfo);
1159         /*
1160          * If connect succeeds, mark socket as connected. If
1161          * connect fails and socket is unbound, reset inp_vflag
1162          * field.
1163          */
1164         if (error == 0)
1165                 soisconnected(so);
1166         else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1167             inp->inp_lport == 0)
1168                 inp->inp_vflag = vflagsav;
1169 out:
1170         INP_WUNLOCK(inp);
1171         return (error);
1172 }
1173
1174 static void
1175 udp6_detach(struct socket *so)
1176 {
1177         struct inpcb *inp;
1178         struct inpcbinfo *pcbinfo;
1179         struct udpcb *up;
1180
1181         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1182         inp = sotoinpcb(so);
1183         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1184
1185         INP_INFO_WLOCK(pcbinfo);
1186         INP_WLOCK(inp);
1187         up = intoudpcb(inp);
1188         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1189         in_pcbdetach(inp);
1190         in_pcbfree(inp);
1191         INP_INFO_WUNLOCK(pcbinfo);
1192         udp_discardcb(up);
1193 }
1194
1195 static int
1196 udp6_disconnect(struct socket *so)
1197 {
1198         struct inpcb *inp;
1199         struct inpcbinfo *pcbinfo;
1200         int error;
1201
1202         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1203         inp = sotoinpcb(so);
1204         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1205
1206         INP_WLOCK(inp);
1207 #ifdef INET
1208         if (inp->inp_vflag & INP_IPV4) {
1209                 struct pr_usrreqs *pru;
1210                 uint8_t nxt;
1211
1212                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1213                     IPPROTO_UDP : IPPROTO_UDPLITE;
1214                 INP_WUNLOCK(inp);
1215                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1216                 (void)(*pru->pru_disconnect)(so);
1217                 return (0);
1218         }
1219 #endif
1220
1221         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1222                 error = ENOTCONN;
1223                 goto out;
1224         }
1225
1226         INP_HASH_WLOCK(pcbinfo);
1227         in6_pcbdisconnect(inp);
1228         inp->in6p_laddr = in6addr_any;
1229         INP_HASH_WUNLOCK(pcbinfo);
1230         SOCK_LOCK(so);
1231         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1232         SOCK_UNLOCK(so);
1233 out:
1234         INP_WUNLOCK(inp);
1235         return (0);
1236 }
1237
1238 static int
1239 udp6_send(struct socket *so, int flags, struct mbuf *m,
1240     struct sockaddr *addr, struct mbuf *control, struct thread *td)
1241 {
1242         struct inpcb *inp;
1243         struct inpcbinfo *pcbinfo;
1244         int error = 0;
1245
1246         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1247         inp = sotoinpcb(so);
1248         KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1249
1250         INP_WLOCK(inp);
1251         if (addr) {
1252                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1253                         error = EINVAL;
1254                         goto bad;
1255                 }
1256                 if (addr->sa_family != AF_INET6) {
1257                         error = EAFNOSUPPORT;
1258                         goto bad;
1259                 }
1260         }
1261
1262 #ifdef INET
1263         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1264                 int hasv4addr;
1265                 struct sockaddr_in6 *sin6 = NULL;
1266
1267                 if (addr == NULL)
1268                         hasv4addr = (inp->inp_vflag & INP_IPV4);
1269                 else {
1270                         sin6 = (struct sockaddr_in6 *)addr;
1271                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1272                             ? 1 : 0;
1273                 }
1274                 if (hasv4addr) {
1275                         struct pr_usrreqs *pru;
1276                         uint8_t nxt;
1277
1278                         nxt = (inp->inp_socket->so_proto->pr_protocol ==
1279                             IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE;
1280                         /*
1281                          * XXXRW: We release UDP-layer locks before calling
1282                          * udp_send() in order to avoid recursion.  However,
1283                          * this does mean there is a short window where inp's
1284                          * fields are unstable.  Could this lead to a
1285                          * potential race in which the factors causing us to
1286                          * select the UDPv4 output routine are invalidated?
1287                          */
1288                         INP_WUNLOCK(inp);
1289                         if (sin6)
1290                                 in6_sin6_2_sin_in_sock(addr);
1291                         pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1292                         /* addr will just be freed in sendit(). */
1293                         return ((*pru->pru_send)(so, flags, m, addr, control,
1294                             td));
1295                 }
1296         }
1297 #endif
1298 #ifdef MAC
1299         mac_inpcb_create_mbuf(inp, m);
1300 #endif
1301         INP_HASH_WLOCK(pcbinfo);
1302         error = udp6_output(inp, m, addr, control, td);
1303         INP_HASH_WUNLOCK(pcbinfo);
1304         INP_WUNLOCK(inp);
1305         return (error);
1306
1307 bad:
1308         INP_WUNLOCK(inp);
1309         m_freem(m);
1310         return (error);
1311 }
1312
1313 struct pr_usrreqs udp6_usrreqs = {
1314         .pru_abort =            udp6_abort,
1315         .pru_attach =           udp6_attach,
1316         .pru_bind =             udp6_bind,
1317         .pru_connect =          udp6_connect,
1318         .pru_control =          in6_control,
1319         .pru_detach =           udp6_detach,
1320         .pru_disconnect =       udp6_disconnect,
1321         .pru_peeraddr =         in6_mapped_peeraddr,
1322         .pru_send =             udp6_send,
1323         .pru_shutdown =         udp_shutdown,
1324         .pru_sockaddr =         in6_mapped_sockaddr,
1325         .pru_soreceive =        soreceive_dgram,
1326         .pru_sosend =           sosend_dgram,
1327         .pru_sosetlabel =       in_pcbsosetlabel,
1328         .pru_close =            udp6_close
1329 };