bsd/netinet6/udp6_usrreq.c

   1 /*
   2  * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 /*      $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.6 2001/07/29 19:32:40 ume Exp $        */
  30 /*      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $    */
  31
  32 /*
  33  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 3. Neither the name of the project nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  */
  60
  61 /*
  62  * Copyright (c) 1982, 1986, 1989, 1993
  63  *      The Regents of the University of California.  All rights reserved.
  64  *
  65  * Redistribution and use in source and binary forms, with or without
  66  * modification, are permitted provided that the following conditions
  67  * are met:
  68  * 1. Redistributions of source code must retain the above copyright
  69  *    notice, this list of conditions and the following disclaimer.
  70  * 2. Redistributions in binary form must reproduce the above copyright
  71  *    notice, this list of conditions and the following disclaimer in the
  72  *    documentation and/or other materials provided with the distribution.
  73  * 3. All advertising materials mentioning features or use of this software
  74  *    must display the following acknowledgement:
  75  *      This product includes software developed by the University of
  76  *      California, Berkeley and its contributors.
  77  * 4. Neither the name of the University nor the names of its contributors
  78  *    may be used to endorse or promote products derived from this software
  79  *    without specific prior written permission.
  80  *
  81  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  82  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  83  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  84  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  85  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  86  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  87  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  88  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  89  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  90  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  91  * SUCH DAMAGE.
  92  *
  93  *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
  94  */
  95
  96 #include <sys/param.h>
  97 #include <sys/kernel.h>
  98 #include <sys/malloc.h>
  99 #include <sys/mbuf.h>
 100 #include <sys/protosw.h>
 101 #include <sys/socket.h>
 102 #include <sys/socketvar.h>
 103 #include <sys/sysctl.h>
 104 #include <sys/errno.h>
 105 #include <sys/stat.h>
 106 #include <sys/systm.h>
 107 #include <sys/syslog.h>
 108 #include <sys/proc.h>
 109 #include <sys/kauth.h>
 110
 111 #include <net/if.h>
 112 #include <net/route.h>
 113 #include <net/if_types.h>
 114 #include <net/ntstat.h>
 115
 116 #include <netinet/in.h>
 117 #include <netinet/in_systm.h>
 118 #include <netinet/ip.h>
 119 #include <netinet/in_pcb.h>
 120 #include <netinet/in_var.h>
 121 #include <netinet/ip_var.h>
 122 #include <netinet/udp.h>
 123 #include <netinet/udp_var.h>
 124 #include <netinet/ip6.h>
 125 #include <netinet6/ip6_var.h>
 126 #include <netinet6/in6_pcb.h>
 127 #include <netinet/icmp6.h>
 128 #include <netinet6/udp6_var.h>
 129 #include <netinet6/ip6protosw.h>
 130
 131 #if IPSEC
 132 #include <netinet6/ipsec.h>
 133 #include <netinet6/ipsec6.h>
 134 extern int ipsec_bypass;
 135 #endif /*IPSEC*/
 136
 137 /*
 138  * UDP protocol inplementation.
 139  * Per RFC 768, August, 1980.
 140  */
 141
 142 extern  struct protosw inetsw[];
 143 static  int udp6_detach(struct socket *so);
 144 static void udp6_append(struct inpcb *, struct ip6_hdr *,
 145     struct sockaddr_in6 *, struct mbuf *, int);
 146
 147 extern  void    ipfwsyslog( int level, const char *format,...);
 148 extern int fw_verbose;
 149
 150 #if IPFIREWALL
 151 #define log_in_vain_log( a ) {            \
 152         if ( (log_in_vain == 3 ) && (fw_verbose == 2)) {        /* Apple logging, log to ipfw.log */ \
 153                 ipfwsyslog a ;  \
 154         }                       \
 155         else log a ;            \
 156 }
 157 #else
 158 #define log_in_vain_log( a ) { log a; }
 159 #endif
 160
 161 /*
 162  * subroutine of udp6_input(), mainly for source code readability.
 163  */
 164 static void
 165 udp6_append(struct inpcb *last, __unused struct ip6_hdr *ip6,
 166     struct sockaddr_in6 *udp_in6, struct mbuf *n, int off)
 167 {
 168         struct  mbuf *opts = NULL;
 169         int ret = 0;
 170 #if CONFIG_MACF_NET
 171         if (mac_inpcb_check_deliver(last, n, AF_INET6, SOCK_DGRAM) != 0) {
 172                 m_freem(n);
 173                 return;
 174         }
 175 #endif
 176         if ((last->in6p_flags & IN6P_CONTROLOPTS) != 0 ||
 177             (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
 178             (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
 179                 ret = ip6_savecontrol(last, n, &opts);
 180                 if (ret != 0) {
 181                         m_freem(n);
 182                         m_freem(opts);
 183                         return;
 184                 }
 185         }
 186         m_adj(n, off);
 187         if (nstat_collect) {
 188                 locked_add_64(&last->inp_stat->rxpackets, 1);
 189                 locked_add_64(&last->inp_stat->rxbytes, n->m_pkthdr.len);
 190         }
 191         so_recv_data_stat(last->in6p_socket, n, 0);
 192         if (sbappendaddr(&last->in6p_socket->so_rcv,
 193             (struct sockaddr *)udp_in6, n, opts, NULL) == 0)
 194                 udpstat.udps_fullsock++;
 195         else
 196                 sorwakeup(last->in6p_socket);
 197 }
 198
 199 int
 200 udp6_input(
 201         struct mbuf **mp,
 202         int *offp,
 203         int proto)
 204 {
 205 #pragma unused(proto)
 206         struct mbuf *m = *mp;
 207         struct ifnet *ifp;
 208         register struct ip6_hdr *ip6;
 209         register struct udphdr *uh;
 210         register struct inpcb *in6p;
 211         struct  mbuf *opts = NULL;
 212         int off = *offp;
 213         int plen, ulen, ret = 0;
 214         struct sockaddr_in6 udp_in6;
 215         struct inpcbinfo *pcbinfo = &udbinfo;
 216         struct sockaddr_in6 fromsa;
 217
 218         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), return IPPROTO_DONE);
 219
 220         ifp = m->m_pkthdr.rcvif;
 221         ip6 = mtod(m, struct ip6_hdr *);
 222
 223 #if defined(NFAITH) && 0 < NFAITH
 224         if (faithprefix(&ip6->ip6_dst)) {
 225                 /* XXX send icmp6 host/port unreach? */
 226                 m_freem(m);
 227                 return IPPROTO_DONE;
 228         }
 229 #endif
 230
 231         udpstat.udps_ipackets++;
 232
 233         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 234         uh = (struct udphdr *)((caddr_t)ip6 + off);
 235         ulen = ntohs((u_short)uh->uh_ulen);
 236
 237         if (plen != ulen) {
 238                 udpstat.udps_badlen++;
 239                 goto bad;
 240         }
 241
 242         /* destination port of 0 is illegal, based on RFC768. */
 243         if (uh->uh_dport == 0)
 244                 goto bad;
 245
 246         /*
 247          * Checksum extended UDP header and data.
 248          */
 249         if (uh->uh_sum) {
 250                 if ((apple_hwcksum_rx != 0) && (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)) {
 251                         uh->uh_sum = m->m_pkthdr.csum_data;
 252                         uh->uh_sum ^= 0xffff;
 253                 }
 254                 else {
 255                         if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 256                                 udpstat.udps_badsum++;
 257                                 goto bad;
 258                         }
 259                 }
 260         }
 261 #ifndef __APPLE__
 262         else
 263                 udpstat.udps_nosum++;
 264 #endif
 265
 266         /*
 267          * Construct sockaddr format source address.
 268          */
 269         init_sin6(&fromsa, m);
 270         fromsa.sin6_port = uh->uh_sport;
 271
 272
 273         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 274                 int reuse_sock = 0, mcast_delivered = 0;
 275                 struct ip6_moptions *imo;
 276                 struct mbuf *n = NULL;
 277
 278                 /*
 279                  * Deliver a multicast datagram to all sockets
 280                  * for which the local and remote addresses and ports match
 281                  * those of the incoming datagram.  This allows more than
 282                  * one process to receive multicasts on the same port.
 283                  * (This really ought to be done for unicast datagrams as
 284                  * well, but that would cause problems with existing
 285                  * applications that open both address-specific sockets and
 286                  * a wildcard socket listening to the same port -- they would
 287                  * end up receiving duplicates of every unicast datagram.
 288                  * Those applications open the multiple sockets to overcome an
 289                  * inadequacy of the UDP socket interface, but for backwards
 290                  * compatibility we avoid the problem here rather than
 291                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 292                  */
 293
 294                 /*
 295                  * In a case that laddr should be set to the link-local
 296                  * address (this happens in RIPng), the multicast address
 297                  * specified in the received packet does not match with
 298                  * laddr. To cure this situation, the matching is relaxed
 299                  * if the receiving interface is the same as one specified
 300                  * in the socket and if the destination multicast address
 301                  * matches one of the multicast groups specified in the socket.
 302                  */
 303
 304                 /*
 305                  * Construct sockaddr format source address.
 306                  */
 307                 init_sin6(&udp_in6, m); /* general init */
 308                 udp_in6.sin6_port = uh->uh_sport;
 309                 /*
 310                  * KAME note: usually we drop udphdr from mbuf here.
 311                  * We need udphdr for IPsec processing so we do that later.
 312                  */
 313
 314                 /*
 315                  * Locate pcb(s) for datagram.
 316                  * (Algorithm copied from raw_intr().)
 317                  */
 318                 lck_rw_lock_shared(pcbinfo->mtx);
 319
 320                 LIST_FOREACH(in6p, &udb, inp_list) {
 321
 322                         if ((in6p->inp_vflag & INP_IPV6) == 0)
 323                                 continue;
 324
 325                         if (in_pcb_checkstate(in6p, WNT_ACQUIRE, 0) == WNT_STOPUSING)
 326                                 continue;
 327
 328                         udp_lock(in6p->in6p_socket, 1, 0);
 329
 330                         if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) == WNT_STOPUSING) {
 331                                 udp_unlock(in6p->in6p_socket, 1, 0);
 332                                 continue;
 333                         }
 334                         if (in6p->in6p_lport != uh->uh_dport) {
 335                                 udp_unlock(in6p->in6p_socket, 1, 0);
 336                                 continue;
 337                         }
 338
 339                         /*
 340                          * Handle socket delivery policy for any-source
 341                          * and source-specific multicast. [RFC3678]
 342                          */
 343                         imo = in6p->in6p_moptions;
 344                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 345                                 struct sockaddr_in6      mcaddr;
 346                                 int                      blocked;
 347
 348                                 IM6O_LOCK(imo);
 349                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
 350                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
 351                                 mcaddr.sin6_family = AF_INET6;
 352                                 mcaddr.sin6_addr = ip6->ip6_dst;
 353
 354                                 blocked = im6o_mc_filter(imo, ifp,
 355                                         (struct sockaddr *)&mcaddr,
 356                                         (struct sockaddr *)&fromsa);
 357                                 IM6O_UNLOCK(imo);
 358                                 if (blocked != MCAST_PASS) {
 359                                         udp_unlock(in6p->in6p_socket, 1, 0);
 360                                         continue;
 361                                 }
 362                         }
 363                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 364                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 365                                                         &ip6->ip6_src) ||
 366                                    in6p->in6p_fport != uh->uh_sport) {
 367                                         udp_unlock(in6p->in6p_socket, 1, 0);
 368                                         continue;
 369                                 }
 370                         }
 371
 372                         reuse_sock = in6p->inp_socket->so_options &
 373                             (SO_REUSEPORT | SO_REUSEADDR);
 374
 375                         {
 376 #if IPSEC
 377                                 int skipit = 0;
 378                                 /* Check AH/ESP integrity. */
 379                                 if (ipsec_bypass == 0) {
 380                                         if (ipsec6_in_reject_so(m, in6p->inp_socket)) {
 381                                                 IPSEC_STAT_INCREMENT(ipsec6stat.in_polvio);
 382                                                 /* do not inject data to pcb */
 383                                                 skipit = 1;
 384                                         }
 385                                 }
 386                                 if (skipit == 0)
 387 #endif /*IPSEC*/
 388                                 {
 389                                         /*
 390                                          * KAME NOTE: do not
 391                                          * m_copy(m, offset, ...) below.
 392                                          * sbappendaddr() expects M_PKTHDR,
 393                                          * and m_copy() will copy M_PKTHDR
 394                                          * only if offset is 0.
 395                                          */
 396                                         if (reuse_sock)
 397                                                 n = m_copy(m, 0, M_COPYALL);
 398                                         udp6_append(in6p, ip6, &udp_in6, m,
 399                                             off + sizeof (struct udphdr));
 400                                         mcast_delivered++;
 401                                 }
 402                                 udp_unlock(in6p->in6p_socket, 1, 0);
 403                         }
 404                         /*
 405                          * Don't look for additional matches if this one does
 406                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 407                          * socket options set.  This heuristic avoids searching
 408                          * through all pcbs in the common case of a non-shared
 409                          * port.  It assumes that an application will never
 410                          * clear these options after setting them.
 411                          */
 412                         if (reuse_sock == 0 || ((m = n) == NULL))
 413                                 break;
 414                         /*
 415                          * Recompute IP and UDP header pointers for new mbuf
 416                          */
 417                         ip6 = mtod(m, struct ip6_hdr *);
 418                         uh = (struct udphdr *)((caddr_t)ip6 + off);
 419                 }
 420                 lck_rw_done(pcbinfo->mtx);
 421
 422                 if (mcast_delivered == 0) {
 423                         /*
 424                          * No matching pcb found; discard datagram.
 425                          * (No need to send an ICMP Port Unreachable
 426                          * for a broadcast or multicast datgram.)
 427                          */
 428                         udpstat.udps_noport++;
 429 #ifndef __APPLE__
 430                         udpstat.udps_noportmcast++;
 431 #endif
 432                         goto bad;
 433                 }
 434
 435                 if (reuse_sock != 0)    /* free the extra copy of mbuf */
 436                         m_freem(m);
 437                 return IPPROTO_DONE;
 438         }
 439         /*
 440          * Locate pcb for datagram.
 441          */
 442         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
 443                                   &ip6->ip6_dst, uh->uh_dport, 1,
 444                                   m->m_pkthdr.rcvif);
 445         if (in6p == 0) {
 446                 if (log_in_vain) {
 447                         char buf[INET6_ADDRSTRLEN];
 448
 449                         strlcpy(buf, ip6_sprintf(&ip6->ip6_dst), sizeof(buf));
 450                         if (log_in_vain != 3)
 451                                 log(LOG_INFO,
 452                                     "Connection attempt to UDP %s:%d from %s:%d\n",
 453                                     buf, ntohs(uh->uh_dport),
 454                                     ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 455                         else if (!(m->m_flags & (M_BCAST | M_MCAST)) &&
 456                                          !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &ip6->ip6_src))
 457                                 log_in_vain_log((LOG_INFO,
 458                                     "Connection attempt to UDP %s:%d from %s:%d\n",
 459                                     buf, ntohs(uh->uh_dport),
 460                                     ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)));
 461                 }
 462                 udpstat.udps_noport++;
 463                 if (m->m_flags & M_MCAST) {
 464                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 465 #ifndef __APPLE__
 466                         udpstat.udps_noportmcast++;
 467 #endif
 468                         goto bad;
 469                 }
 470                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 471                 return IPPROTO_DONE;
 472         }
 473 #if IPSEC
 474         /*
 475          * Check AH/ESP integrity.
 476          */
 477         if (ipsec_bypass == 0) {
 478                 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 479                         IPSEC_STAT_INCREMENT(ipsec6stat.in_polvio);
 480                         in_pcb_checkstate(in6p, WNT_RELEASE, 0);
 481                         goto bad;
 482                 }
 483         }
 484 #endif /*IPSEC*/
 485
 486         /*
 487          * Construct sockaddr format source address.
 488          * Stuff source address and datagram in user buffer.
 489          */
 490         udp_lock(in6p->in6p_socket, 1, 0);
 491
 492         if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) == WNT_STOPUSING) {
 493                 udp_unlock(in6p->in6p_socket, 1, 0);
 494                 goto bad;
 495         }
 496
 497         init_sin6(&udp_in6, m); /* general init */
 498         udp_in6.sin6_port = uh->uh_sport;
 499         if ((in6p->in6p_flags & IN6P_CONTROLOPTS) != 0 ||
 500                 (in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
 501                 (in6p->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
 502                 ret = ip6_savecontrol(in6p, m, &opts);
 503                 if (ret != 0) {
 504                         udp_unlock(in6p->in6p_socket, 1, 0);
 505                         goto bad;
 506                 }
 507         }
 508         m_adj(m, off + sizeof(struct udphdr));
 509         if (nstat_collect) {
 510                 locked_add_64(&in6p->inp_stat->rxpackets, 1);
 511                 locked_add_64(&in6p->inp_stat->rxbytes, m->m_pkthdr.len);
 512         }
 513         so_recv_data_stat(in6p->in6p_socket, m, 0);
 514         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
 515                         (struct sockaddr *)&udp_in6,
 516                         m, opts, NULL) == 0) {
 517                 m = NULL;
 518                 opts = NULL;
 519                 udpstat.udps_fullsock++;
 520                 udp_unlock(in6p->in6p_socket, 1, 0);
 521                 goto bad;
 522         }
 523         sorwakeup(in6p->in6p_socket);
 524         udp_unlock(in6p->in6p_socket, 1, 0);
 525         return IPPROTO_DONE;
 526 bad:
 527         if (m)
 528                 m_freem(m);
 529         if (opts)
 530                 m_freem(opts);
 531         return IPPROTO_DONE;
 532 }
 533
 534 void
 535 udp6_ctlinput(
 536         int cmd,
 537         struct sockaddr *sa,
 538         void *d)
 539 {
 540         struct udphdr uh;
 541         struct ip6_hdr *ip6;
 542         struct mbuf *m;
 543         int off = 0;
 544         struct ip6ctlparam *ip6cp = NULL;
 545         const struct sockaddr_in6 *sa6_src = NULL;
 546         void (*notify)(struct inpcb *, int) = udp_notify;
 547         struct udp_portonly {
 548                 u_int16_t uh_sport;
 549                 u_int16_t uh_dport;
 550         } *uhp;
 551
 552         if (sa->sa_family != AF_INET6 ||
 553             sa->sa_len != sizeof(struct sockaddr_in6))
 554                 return;
 555
 556         if ((unsigned)cmd >= PRC_NCMDS)
 557                 return;
 558         if (PRC_IS_REDIRECT(cmd))
 559                 notify = in6_rtchange, d = NULL;
 560         else if (cmd == PRC_HOSTDEAD)
 561                 d = NULL;
 562         else if (inet6ctlerrmap[cmd] == 0)
 563                 return;
 564
 565         /* if the parameter is from icmp6, decode it. */
 566         if (d != NULL) {
 567                 ip6cp = (struct ip6ctlparam *)d;
 568                 m = ip6cp->ip6c_m;
 569                 ip6 = ip6cp->ip6c_ip6;
 570                 off = ip6cp->ip6c_off;
 571                 sa6_src = ip6cp->ip6c_src;
 572         } else {
 573                 m = NULL;
 574                 ip6 = NULL;
 575                 sa6_src = &sa6_any;
 576         }
 577
 578         if (ip6) {
 579                 /*
 580                  * XXX: We assume that when IPV6 is non NULL,
 581                  * M and OFF are valid.
 582                  */
 583
 584                 /* check if we can safely examine src and dst ports */
 585                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 586                         return;
 587
 588                 bzero(&uh, sizeof(uh));
 589                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 590
 591                 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
 592                                         (struct sockaddr*)ip6cp->ip6c_src,
 593                                         uh.uh_sport, cmd, NULL, notify);
 594         } else
 595                 (void) in6_pcbnotify(&udbinfo, sa, 0, (struct sockaddr *)&sa6_src,
 596                                      0, cmd, NULL, notify);
 597 }
 598
 599 #ifndef __APPLE__
 600 static int
 601 udp6_getcred SYSCTL_HANDLER_ARGS
 602 {
 603         struct sockaddr_in6 addrs[2];
 604         struct inpcb *inp;
 605         int error, s;
 606
 607         error = proc_suser(req->p);
 608         if (error)
 609                 return (error);
 610
 611         if (req->newlen != sizeof(addrs))
 612                 return (EINVAL);
 613         if (req->oldlen != sizeof(*(kauth_cred_t)0))
 614                 return (EINVAL);
 615         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 616         if (error)
 617                 return (error);
 618         s = splnet();
 619         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
 620                                  addrs[1].sin6_port,
 621                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 622                                  1, NULL);
 623         if (!inp || !inp->inp_socket || !inp->inp_socket->so_cred) {
 624                 error = ENOENT;
 625                 goto out;
 626         }
 627         /*
 628          * XXX This should not be copying out a credential!!!!  This
 629          * XXX is an opaque type, and is not intended to be introspected,
 630          * XXX and the size of this structure *WILL* change as planned MACF
 631          * XXX and kauth changes go forward.
 632          */
 633         error = SYSCTL_OUT(req, inp->inp_socket->so_cred->pc_ucred,
 634                            sizeof(*(kauth_cred_t)0));
 635
 636 out:
 637         splx(s);
 638         return (error);
 639 }
 640
 641 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 642             0, 0,
 643             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 644 #endif
 645
 646 static int
 647 udp6_abort(struct socket *so)
 648 {
 649         struct inpcb *inp;
 650
 651         inp = sotoinpcb(so);
 652         if (inp == 0)
 653                 return EINVAL;  /* ??? possible? panic instead? */
 654         soisdisconnected(so);
 655         in6_pcbdetach(inp);
 656         return 0;
 657 }
 658
 659 static int
 660 udp6_attach(struct socket *so, __unused int proto, struct proc *p)
 661 {
 662         struct inpcb *inp;
 663         int error;
 664
 665         inp = sotoinpcb(so);
 666         if (inp != 0)
 667                 return EINVAL;
 668
 669         error = in_pcballoc(so, &udbinfo, p);
 670         if (error)
 671                 return error;
 672
 673         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 674                 error = soreserve(so, udp_sendspace, udp_recvspace);
 675                 if (error)
 676                         return error;
 677         }
 678         inp = (struct inpcb *)so->so_pcb;
 679         inp->inp_vflag |= INP_IPV6;
 680         if (ip6_mapped_addr_on)
 681                 inp->inp_vflag |= INP_IPV4;
 682         inp->in6p_hops = -1;    /* use kernel default */
 683         inp->in6p_cksum = -1;   /* just to be sure */
 684         /*
 685          * XXX: ugly!!
 686          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 687          * because the socket may be bound to an IPv6 wildcard address,
 688          * which may match an IPv4-mapped IPv6 address.
 689          */
 690         inp->inp_ip_ttl = ip_defttl;
 691         nstat_udp_new_pcb(inp);
 692         return 0;
 693 }
 694
 695 static int
 696 udp6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
 697 {
 698         struct inpcb *inp;
 699         int error;
 700
 701         inp = sotoinpcb(so);
 702         if (inp == 0)
 703                 return EINVAL;
 704
 705         inp->inp_vflag &= ~INP_IPV4;
 706         inp->inp_vflag |= INP_IPV6;
 707         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 708                 struct sockaddr_in6 *sin6_p;
 709
 710                 sin6_p = (struct sockaddr_in6 *)nam;
 711
 712                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 713                         inp->inp_vflag |= INP_IPV4;
 714                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 715                         struct sockaddr_in sin;
 716
 717                         in6_sin6_2_sin(&sin, sin6_p);
 718                         inp->inp_vflag |= INP_IPV4;
 719                         inp->inp_vflag &= ~INP_IPV6;
 720                         error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
 721                         return error;
 722                 }
 723         }
 724
 725         error = in6_pcbbind(inp, nam, p);
 726         return error;
 727 }
 728
 729 static int
 730 udp6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
 731 {
 732         struct inpcb *inp;
 733         int error;
 734
 735         inp = sotoinpcb(so);
 736         if (inp == 0)
 737                 return EINVAL;
 738
 739         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 740                 struct sockaddr_in6 *sin6_p;
 741
 742                 sin6_p = (struct sockaddr_in6 *)nam;
 743                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 744                         struct sockaddr_in sin;
 745
 746                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 747                                 return EISCONN;
 748                         in6_sin6_2_sin(&sin, sin6_p);
 749                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, p, NULL);
 750                         if (error == 0) {
 751                                 inp->inp_vflag |= INP_IPV4;
 752                                 inp->inp_vflag &= ~INP_IPV6;
 753                                 soisconnected(so);
 754                         }
 755                         return error;
 756                 }
 757         }
 758
 759         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 760                 return EISCONN;
 761         error = in6_pcbconnect(inp, nam, p);
 762         if (error == 0) {
 763                 if (ip6_mapped_addr_on || (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { /* should be non mapped addr */
 764                         inp->inp_vflag &= ~INP_IPV4;
 765                         inp->inp_vflag |= INP_IPV6;
 766                 }
 767                 soisconnected(so);
 768         }
 769         return error;
 770 }
 771
 772 static int
 773 udp6_detach(struct socket *so)
 774 {
 775         struct inpcb *inp;
 776
 777         inp = sotoinpcb(so);
 778         if (inp == 0)
 779                 return EINVAL;
 780         in6_pcbdetach(inp);
 781         return 0;
 782 }
 783
 784 static int
 785 udp6_disconnect(struct socket *so)
 786 {
 787         struct inpcb *inp;
 788
 789         inp = sotoinpcb(so);
 790         if (inp == 0)
 791                 return EINVAL;
 792
 793         if (inp->inp_vflag & INP_IPV4) {
 794                 struct pr_usrreqs *pru;
 795
 796                 pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
 797                 return ((*pru->pru_disconnect)(so));
 798         }
 799
 800         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 801                 return ENOTCONN;
 802
 803         in6_pcbdisconnect(inp);
 804         inp->in6p_laddr = in6addr_any;
 805         inp->in6p_last_outif = 0;
 806         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 807         return 0;
 808 }
 809
 810 static int
 811 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 812           struct mbuf *control, struct proc *p)
 813 {
 814         struct inpcb *inp;
 815         int error = 0;
 816
 817         inp = sotoinpcb(so);
 818         if (inp == 0) {
 819                 error = EINVAL;
 820                 goto bad;
 821         }
 822
 823         if (addr) {
 824                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 825                         error = EINVAL;
 826                         goto bad;
 827                 }
 828                 if (addr->sa_family != AF_INET6) {
 829                         error = EAFNOSUPPORT;
 830                         goto bad;
 831                 }
 832         }
 833
 834         if (ip6_mapped_addr_on || (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 835                 int hasv4addr;
 836                 struct sockaddr_in6 *sin6 = 0;
 837
 838                 if (addr == 0)
 839                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 840                 else {
 841                         sin6 = (struct sockaddr_in6 *)addr;
 842                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 843                                 ? 1 : 0;
 844                 }
 845                 if (hasv4addr) {
 846                         struct pr_usrreqs *pru;
 847
 848                         if (sin6)
 849                                 in6_sin6_2_sin_in_sock(addr);
 850                         pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
 851                         error = ((*pru->pru_send)(so, flags, m, addr, control,
 852                                                   p));
 853                         /* addr will just be freed in sendit(). */
 854                         return error;
 855                 }
 856         }
 857
 858         return udp6_output(inp, m, addr, control, p);
 859
 860   bad:
 861         m_freem(m);
 862         return(error);
 863 }
 864
 865 struct pr_usrreqs udp6_usrreqs = {
 866         udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
 867         pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
 868         pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
 869         pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
 870         in6_mapped_sockaddr, sosend, soreceive, pru_sopoll_notsupp
 871 };