sys/netinet6/udp6_usrreq.c

   1 /*      $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.13 2003/01/24 05:11:35 sam Exp $       */
   2 /*      $DragonFly: src/sys/netinet6/udp6_usrreq.c,v 1.26 2007/04/22 01:13:14 dillon Exp $      */
   3 /*      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $    */
   4
   5 /*
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1989, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
  67  */
  68
  69 #include "opt_inet.h"
  70 #include "opt_inet6.h"
  71 #include "opt_ipsec.h"
  72
  73 #include <sys/param.h>
  74 #include <sys/kernel.h>
  75 #include <sys/mbuf.h>
  76 #include <sys/protosw.h>
  77 #include <sys/socket.h>
  78 #include <sys/socketvar.h>
  79 #include <sys/sysctl.h>
  80 #include <sys/errno.h>
  81 #include <sys/stat.h>
  82 #include <sys/systm.h>
  83 #include <sys/syslog.h>
  84 #include <sys/proc.h>
  85 #include <sys/priv.h>
  86
  87 #include <sys/thread2.h>
  88 #include <sys/socketvar2.h>
  89 #include <sys/msgport2.h>
  90
  91 #include <net/if.h>
  92 #include <net/route.h>
  93 #include <net/if_types.h>
  94
  95 #include <netinet/in.h>
  96 #include <netinet/in_systm.h>
  97 #include <netinet/ip.h>
  98 #include <netinet/in_pcb.h>
  99 #include <netinet/in_var.h>
 100 #include <netinet/ip_var.h>
 101 #include <netinet/udp.h>
 102 #include <netinet/udp_var.h>
 103 #include <netinet/ip6.h>
 104 #include <netinet6/ip6_var.h>
 105 #include <netinet6/in6_pcb.h>
 106 #include <netinet/icmp6.h>
 107 #include <netinet6/udp6_var.h>
 108 #include <netinet6/ip6protosw.h>
 109
 110 #ifdef IPSEC
 111 #include <netinet6/ipsec.h>
 112 #include <netinet6/ipsec6.h>
 113 #endif /* IPSEC */
 114
 115 #ifdef FAST_IPSEC
 116 #include <netproto/ipsec/ipsec.h>
 117 #include <netproto/ipsec/ipsec6.h>
 118 #endif /* FAST_IPSEC */
 119
 120 /*
 121  * UDP protocol inplementation.
 122  * Per RFC 768, August, 1980.
 123  */
 124
 125 extern  struct protosw inetsw[];
 126 static  int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
 127
 128 static int
 129 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
 130 {
 131         struct ip6_moptions *im6o = in6p->in6p_moptions;
 132         struct in6_multi_mship *imm;
 133
 134         if (im6o == NULL)
 135                 return 0;
 136
 137         for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
 138              imm = imm->i6mm_chain.le_next) {
 139                 if ((ifp == NULL ||
 140                      imm->i6mm_maddr->in6m_ifp == ifp) &&
 141                     IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
 142                                        ia6))
 143                         return 1;
 144         }
 145         return 0;
 146 }
 147
 148 int
 149 udp6_input(struct mbuf **mp, int *offp, int proto)
 150 {
 151         struct mbuf *m = *mp;
 152         struct ip6_hdr *ip6;
 153         struct udphdr *uh;
 154         struct inpcb *in6p;
 155         struct  mbuf *opts = NULL;
 156         int off = *offp;
 157         int plen, ulen;
 158         struct sockaddr_in6 udp_in6;
 159         struct socket *so;
 160
 161         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 162
 163         ip6 = mtod(m, struct ip6_hdr *);
 164
 165         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
 166                 /* XXX send icmp6 host/port unreach? */
 167                 m_freem(m);
 168                 return IPPROTO_DONE;
 169         }
 170
 171         udpstat.udps_ipackets++;
 172
 173         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 174         uh = (struct udphdr *)((caddr_t)ip6 + off);
 175         ulen = ntohs((u_short)uh->uh_ulen);
 176
 177         if (plen != ulen) {
 178                 udpstat.udps_badlen++;
 179                 goto bad;
 180         }
 181
 182         /*
 183          * Checksum extended UDP header and data.
 184          */
 185         if (uh->uh_sum == 0)
 186                 udpstat.udps_nosum++;
 187         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 188                 udpstat.udps_badsum++;
 189                 goto bad;
 190         }
 191
 192         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 193                 struct  inpcb *last;
 194
 195                 /*
 196                  * Deliver a multicast datagram to all sockets
 197                  * for which the local and remote addresses and ports match
 198                  * those of the incoming datagram.  This allows more than
 199                  * one process to receive multicasts on the same port.
 200                  * (This really ought to be done for unicast datagrams as
 201                  * well, but that would cause problems with existing
 202                  * applications that open both address-specific sockets and
 203                  * a wildcard socket listening to the same port -- they would
 204                  * end up receiving duplicates of every unicast datagram.
 205                  * Those applications open the multiple sockets to overcome an
 206                  * inadequacy of the UDP socket interface, but for backwards
 207                  * compatibility we avoid the problem here rather than
 208                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 209                  */
 210
 211                 /*
 212                  * In a case that laddr should be set to the link-local
 213                  * address (this happens in RIPng), the multicast address
 214                  * specified in the received packet does not match with
 215                  * laddr. To cure this situation, the matching is relaxed
 216                  * if the receiving interface is the same as one specified
 217                  * in the socket and if the destination multicast address
 218                  * matches one of the multicast groups specified in the socket.
 219                  */
 220
 221                 /*
 222                  * Construct sockaddr format source address.
 223                  */
 224                 init_sin6(&udp_in6, m); /* general init */
 225                 udp_in6.sin6_port = uh->uh_sport;
 226                 /*
 227                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
 228                  * We need udphdr for IPsec processing so we do that later.
 229                  */
 230
 231                 /*
 232                  * Locate pcb(s) for datagram.
 233                  * (Algorithm copied from raw_intr().)
 234                  */
 235                 last = NULL;
 236                 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) {
 237                         if (in6p->inp_flags & INP_PLACEMARKER)
 238                                 continue;
 239                         if (!(in6p->inp_vflag & INP_IPV6))
 240                                 continue;
 241                         if (in6p->in6p_lport != uh->uh_dport)
 242                                 continue;
 243                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 244                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 245                                                         &ip6->ip6_dst) &&
 246                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
 247                                                  m->m_pkthdr.rcvif))
 248                                         continue;
 249                         }
 250                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 251                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 252                                                         &ip6->ip6_src) ||
 253                                    in6p->in6p_fport != uh->uh_sport)
 254                                         continue;
 255                         }
 256
 257                         if (last != NULL) {
 258                                 struct mbuf *n;
 259
 260 #ifdef IPSEC
 261                                 /*
 262                                  * Check AH/ESP integrity.
 263                                  */
 264                                 if (ipsec6_in_reject_so(m, last->inp_socket))
 265                                         ipsec6stat.in_polvio++;
 266                                         /* do not inject data into pcb */
 267                                 else
 268 #endif /* IPSEC */
 269 #ifdef FAST_IPSEC
 270                                 /*
 271                                  * Check AH/ESP integrity.
 272                                  */
 273                                 if (ipsec6_in_reject(m, last))
 274                                         ;
 275                                 else
 276 #endif /* FAST_IPSEC */
 277                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 278                                         /*
 279                                          * KAME NOTE: do not
 280                                          * m_copy(m, offset, ...) above.
 281                                          * ssb_appendaddr() expects M_PKTHDR,
 282                                          * and m_copy() will copy M_PKTHDR
 283                                          * only if offset is 0.
 284                                          */
 285                                         so = last->in6p_socket;
 286                                         if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
 287                                             (so->so_options & SO_TIMESTAMP)) {
 288                                                 ip6_savecontrol(last, &opts,
 289                                                                 ip6, n);
 290                                         }
 291                                         m_adj(n, off + sizeof(struct udphdr));
 292                                         lwkt_gettoken(&so->so_rcv.ssb_token);
 293                                         if (ssb_appendaddr(&so->so_rcv,
 294                                                     (struct sockaddr *)&udp_in6,
 295                                                     n, opts) == 0) {
 296                                                 m_freem(n);
 297                                                 if (opts)
 298                                                         m_freem(opts);
 299                                                 udpstat.udps_fullsock++;
 300                                         } else {
 301                                                 sorwakeup(so);
 302                                         }
 303                                         lwkt_reltoken(&so->so_rcv.ssb_token);
 304                                         opts = NULL;
 305                                 }
 306                         }
 307                         last = in6p;
 308                         /*
 309                          * Don't look for additional matches if this one does
 310                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 311                          * socket options set.  This heuristic avoids searching
 312                          * through all pcbs in the common case of a non-shared
 313                          * port.  It assumes that an application will never
 314                          * clear these options after setting them.
 315                          */
 316                         if ((last->in6p_socket->so_options &
 317                              (SO_REUSEPORT | SO_REUSEADDR)) == 0)
 318                                 break;
 319                 }
 320
 321                 if (last == NULL) {
 322                         /*
 323                          * No matching pcb found; discard datagram.
 324                          * (No need to send an ICMP Port Unreachable
 325                          * for a broadcast or multicast datgram.)
 326                          */
 327                         udpstat.udps_noport++;
 328                         udpstat.udps_noportmcast++;
 329                         goto bad;
 330                 }
 331 #ifdef IPSEC
 332                 /*
 333                  * Check AH/ESP integrity.
 334                  */
 335                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
 336                         ipsec6stat.in_polvio++;
 337                         goto bad;
 338                 }
 339 #endif /* IPSEC */
 340 #ifdef FAST_IPSEC
 341                 /*
 342                  * Check AH/ESP integrity.
 343                  */
 344                 if (ipsec6_in_reject(m, last)) {
 345                         goto bad;
 346                 }
 347 #endif /* FAST_IPSEC */
 348                 if (last->in6p_flags & IN6P_CONTROLOPTS
 349                     || last->in6p_socket->so_options & SO_TIMESTAMP)
 350                         ip6_savecontrol(last, &opts, ip6, m);
 351
 352                 m_adj(m, off + sizeof(struct udphdr));
 353                 so = last->in6p_socket;
 354                 lwkt_gettoken(&so->so_rcv.ssb_token);
 355                 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
 356                                    m, opts) == 0) {
 357                         udpstat.udps_fullsock++;
 358                         lwkt_reltoken(&so->so_rcv.ssb_token);
 359                         goto bad;
 360                 }
 361                 sorwakeup(so);
 362                 lwkt_reltoken(&so->so_rcv.ssb_token);
 363                 return IPPROTO_DONE;
 364         }
 365         /*
 366          * Locate pcb for datagram.
 367          */
 368         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
 369                                   &ip6->ip6_dst, uh->uh_dport, 1,
 370                                   m->m_pkthdr.rcvif);
 371         if (in6p == NULL) {
 372                 if (log_in_vain) {
 373                         char buf[INET6_ADDRSTRLEN];
 374
 375                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
 376                         log(LOG_INFO,
 377                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 378                             buf, ntohs(uh->uh_dport),
 379                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 380                 }
 381                 udpstat.udps_noport++;
 382                 if (m->m_flags & M_MCAST) {
 383                         kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
 384                         udpstat.udps_noportmcast++;
 385                         goto bad;
 386                 }
 387                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 388                 return IPPROTO_DONE;
 389         }
 390 #ifdef IPSEC
 391         /*
 392          * Check AH/ESP integrity.
 393          */
 394         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 395                 ipsec6stat.in_polvio++;
 396                 goto bad;
 397         }
 398 #endif /* IPSEC */
 399 #ifdef FAST_IPSEC
 400         /*
 401          * Check AH/ESP integrity.
 402          */
 403         if (ipsec6_in_reject(m, in6p)) {
 404                 goto bad;
 405         }
 406 #endif /* FAST_IPSEC */
 407
 408         /*
 409          * Construct sockaddr format source address.
 410          * Stuff source address and datagram in user buffer.
 411          */
 412         init_sin6(&udp_in6, m); /* general init */
 413         udp_in6.sin6_port = uh->uh_sport;
 414         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 415             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 416                 ip6_savecontrol(in6p, &opts, ip6, m);
 417         m_adj(m, off + sizeof(struct udphdr));
 418         so = in6p->in6p_socket;
 419         lwkt_gettoken(&so->so_rcv.ssb_token);
 420         if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
 421                            m, opts) == 0) {
 422                 udpstat.udps_fullsock++;
 423                 lwkt_reltoken(&so->so_rcv.ssb_token);
 424                 goto bad;
 425         }
 426         sorwakeup(so);
 427         lwkt_reltoken(&so->so_rcv.ssb_token);
 428         return IPPROTO_DONE;
 429 bad:
 430         if (m)
 431                 m_freem(m);
 432         if (opts)
 433                 m_freem(opts);
 434         return IPPROTO_DONE;
 435 }
 436
 437 void
 438 udp6_ctlinput(netmsg_t msg)
 439 {
 440         int cmd = msg->ctlinput.nm_cmd;
 441         struct sockaddr *sa = msg->ctlinput.nm_arg;
 442         void *d = msg->ctlinput.nm_extra;
 443         struct udphdr uh;
 444         struct ip6_hdr *ip6;
 445         struct mbuf *m;
 446         int off = 0;
 447         struct ip6ctlparam *ip6cp = NULL;
 448         const struct sockaddr_in6 *sa6_src = NULL;
 449         void (*notify) (struct inpcb *, int) = udp_notify;
 450         struct udp_portonly {
 451                 u_int16_t uh_sport;
 452                 u_int16_t uh_dport;
 453         } *uhp;
 454
 455         if (sa->sa_family != AF_INET6 ||
 456             sa->sa_len != sizeof(struct sockaddr_in6))
 457                 goto out;
 458
 459         if ((unsigned)cmd >= PRC_NCMDS)
 460                 goto out;
 461         if (PRC_IS_REDIRECT(cmd))
 462                 notify = in6_rtchange, d = NULL;
 463         else if (cmd == PRC_HOSTDEAD)
 464                 d = NULL;
 465         else if (inet6ctlerrmap[cmd] == 0)
 466                 goto out;
 467
 468         /* if the parameter is from icmp6, decode it. */
 469         if (d != NULL) {
 470                 ip6cp = (struct ip6ctlparam *)d;
 471                 m = ip6cp->ip6c_m;
 472                 ip6 = ip6cp->ip6c_ip6;
 473                 off = ip6cp->ip6c_off;
 474                 sa6_src = ip6cp->ip6c_src;
 475         } else {
 476                 m = NULL;
 477                 ip6 = NULL;
 478                 sa6_src = &sa6_any;
 479         }
 480
 481         if (ip6) {
 482                 /*
 483                  * XXX: We assume that when IPV6 is non NULL,
 484                  * M and OFF are valid.
 485                  */
 486
 487                 /* check if we can safely examine src and dst ports */
 488                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 489                         return;
 490
 491                 bzero(&uh, sizeof(uh));
 492                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 493
 494                 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport,
 495                               (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
 496                               cmd, 0, notify);
 497         } else {
 498                 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0,
 499                               (const struct sockaddr *)sa6_src, 0,
 500                               cmd, 0, notify);
 501         }
 502 out:
 503         lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
 504 }
 505
 506 static int
 507 udp6_getcred(SYSCTL_HANDLER_ARGS)
 508 {
 509         struct sockaddr_in6 addrs[2];
 510         struct inpcb *inp;
 511         int error;
 512
 513         error = priv_check(req->td, PRIV_ROOT);
 514         if (error)
 515                 return (error);
 516
 517         if (req->newlen != sizeof(addrs))
 518                 return (EINVAL);
 519         if (req->oldlen != sizeof(struct ucred))
 520                 return (EINVAL);
 521         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 522         if (error)
 523                 return (error);
 524         crit_enter();
 525         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
 526                                  addrs[1].sin6_port,
 527                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 528                                  1, NULL);
 529         if (!inp || !inp->inp_socket) {
 530                 error = ENOENT;
 531                 goto out;
 532         }
 533         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
 534                            sizeof(struct ucred));
 535
 536 out:
 537         crit_exit();
 538         return (error);
 539 }
 540
 541 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 542             0, 0,
 543             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 544
 545 /*
 546  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
 547  *       will sofree() it when we return.
 548  */
 549 static void
 550 udp6_abort(netmsg_t msg)
 551 {
 552         struct socket *so = msg->abort.base.nm_so;
 553         struct inpcb *inp;
 554         int error;
 555
 556         inp = so->so_pcb;
 557         if (inp) {
 558                 soisdisconnected(so);
 559                 in6_pcbdetach(inp);
 560                 error = 0;
 561         } else {
 562                 error = EINVAL;
 563         }
 564         lwkt_replymsg(&msg->abort.base.lmsg, error);
 565 }
 566
 567 static void
 568 udp6_attach(netmsg_t msg)
 569 {
 570         struct socket *so = msg->attach.base.nm_so;
 571         struct pru_attach_info *ai = msg->attach.nm_ai;
 572         struct inpcb *inp;
 573         int error;
 574
 575         inp = so->so_pcb;
 576         if (inp != NULL) {
 577                 error = EINVAL;
 578                 goto out;
 579         }
 580
 581         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
 582                 error = soreserve(so, udp_sendspace, udp_recvspace,
 583                     ai->sb_rlimit);
 584                 if (error)
 585                         goto out;
 586         }
 587         crit_enter();
 588         error = in_pcballoc(so, &udbinfo);
 589         crit_exit();
 590         if (error)
 591                 goto out;
 592         sosetport(so, cpu_portfn(0));
 593         inp = (struct inpcb *)so->so_pcb;
 594         inp->inp_vflag |= INP_IPV6;
 595         if (!ip6_v6only)
 596                 inp->inp_vflag |= INP_IPV4;
 597         inp->in6p_hops = -1;    /* use kernel default */
 598         inp->in6p_cksum = -1;   /* just to be sure */
 599         /*
 600          * XXX: ugly!!
 601          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 602          * because the socket may be bound to an IPv6 wildcard address,
 603          * which may match an IPv4-mapped IPv6 address.
 604          */
 605         inp->inp_ip_ttl = ip_defttl;
 606         error = 0;
 607 out:
 608         lwkt_replymsg(&msg->attach.base.lmsg, error);
 609 }
 610
 611 static void
 612 udp6_bind(netmsg_t msg)
 613 {
 614         struct socket *so =msg->bind.base.nm_so;
 615         struct sockaddr *nam = msg->bind.nm_nam;
 616         struct thread *td = msg->bind.nm_td;
 617         struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
 618         struct inpcb *inp;
 619         int error;
 620
 621         inp = so->so_pcb;
 622         if (inp == NULL) {
 623                 error = EINVAL;
 624                 goto out;
 625         }
 626
 627         inp->inp_vflag &= ~INP_IPV4;
 628         inp->inp_vflag |= INP_IPV6;
 629         if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 630                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 631                         inp->inp_vflag |= INP_IPV4;
 632                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 633                         struct sockaddr_in sin;
 634
 635                         in6_sin6_2_sin(&sin, sin6_p);
 636                         inp->inp_vflag |= INP_IPV4;
 637                         inp->inp_vflag &= ~INP_IPV6;
 638                         crit_enter();
 639                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 640                         crit_exit();
 641                         goto out;
 642                 }
 643         }
 644
 645         crit_enter();
 646         error = in6_pcbbind(inp, nam, td);
 647         crit_exit();
 648         if (error == 0) {
 649                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 650                         inp->inp_flags |= INP_WASBOUND_NOTANY;
 651                 in_pcbinswildcardhash(inp);
 652         }
 653 out:
 654         lwkt_replymsg(&msg->bind.base.lmsg, error);
 655 }
 656
 657 static void
 658 udp6_connect(netmsg_t msg)
 659 {
 660         struct socket *so = msg->connect.base.nm_so;
 661         struct sockaddr *nam = msg->connect.nm_nam;
 662         struct thread *td = msg->connect.nm_td;
 663         struct inpcb *inp;
 664         int error;
 665
 666         inp = so->so_pcb;
 667         if (inp == NULL) {
 668                 error = EINVAL;
 669                 goto out;
 670         }
 671
 672         if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 673                 struct sockaddr_in6 *sin6_p;
 674
 675                 sin6_p = (struct sockaddr_in6 *)nam;
 676                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 677                         struct sockaddr_in sin;
 678
 679                         if (inp->inp_faddr.s_addr != INADDR_ANY) {
 680                                 error = EISCONN;
 681                                 goto out;
 682                         }
 683                         in6_sin6_2_sin(&sin, sin6_p);
 684                         crit_enter();
 685                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
 686                         crit_exit();
 687                         if (error == 0) {
 688                                 inp->inp_vflag |= INP_IPV4;
 689                                 inp->inp_vflag &= ~INP_IPV6;
 690                                 soisconnected(so);
 691                         }
 692                         goto out;
 693                 }
 694         }
 695         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 696                 error = EISCONN;
 697                 goto out;
 698         }
 699         if (inp->inp_flags & INP_WILDCARD)
 700                 in_pcbremwildcardhash(inp);
 701         if (!prison_remote_ip(td, nam)) {
 702                 error = EAFNOSUPPORT; /* IPv4 only jail */
 703                 goto out;
 704         }
 705         crit_enter();
 706         error = in6_pcbconnect(inp, nam, td);
 707         crit_exit();
 708         if (error == 0) {
 709                 if (!ip6_v6only) { /* should be non mapped addr */
 710                         inp->inp_vflag &= ~INP_IPV4;
 711                         inp->inp_vflag |= INP_IPV6;
 712                 }
 713                 soisconnected(so);
 714         } else if (error == EAFNOSUPPORT) {     /* connection dissolved */
 715                 /*
 716                  * Follow traditional BSD behavior and retain
 717                  * the local port binding.  But, fix the old misbehavior
 718                  * of overwriting any previously bound local address.
 719                  */
 720                 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
 721                         inp->in6p_laddr = kin6addr_any;
 722                 in_pcbinswildcardhash(inp);
 723         }
 724 out:
 725         lwkt_replymsg(&msg->connect.base.lmsg, error);
 726 }
 727
 728 static void
 729 udp6_detach(netmsg_t msg)
 730 {
 731         struct socket *so = msg->detach.base.nm_so;
 732         struct inpcb *inp;
 733         int error;
 734
 735         inp = so->so_pcb;
 736         if (inp) {
 737                 crit_enter();
 738                 in6_pcbdetach(inp);
 739                 crit_exit();
 740                 error = 0;
 741         } else {
 742                 error = EINVAL;
 743         }
 744         lwkt_replymsg(&msg->detach.base.lmsg, error);
 745 }
 746
 747 static void
 748 udp6_disconnect(netmsg_t msg)
 749 {
 750         struct socket *so = msg->disconnect.base.nm_so;
 751         struct inpcb *inp;
 752         int error;
 753
 754         inp = so->so_pcb;
 755         if (inp == NULL) {
 756                 error = EINVAL;
 757                 goto out;
 758         }
 759
 760         if (inp->inp_vflag & INP_IPV4) {
 761                 const struct pr_usrreqs *pru;
 762
 763                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 764                 pru->pru_disconnect(msg);       /* XXX on right port? */
 765                 return;
 766         }
 767
 768         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 769                 error = ENOTCONN;
 770         } else {
 771                 crit_enter();
 772                 in6_pcbdisconnect(inp);
 773                 crit_exit();
 774                 soclrstate(so, SS_ISCONNECTED);         /* XXX */
 775                 error = 0;
 776         }
 777 out:
 778         lwkt_replymsg(&msg->disconnect.base.lmsg, error);
 779 }
 780
 781 static void
 782 udp6_send(netmsg_t msg)
 783 {
 784         struct socket *so = msg->send.base.nm_so;
 785         struct mbuf *m = msg->send.nm_m;
 786         struct sockaddr *addr = msg->send.nm_addr;
 787         struct mbuf *control = msg->send.nm_control;
 788         struct thread *td = msg->send.nm_td;
 789         struct inpcb *inp;
 790         int error = 0;
 791
 792         inp = so->so_pcb;
 793         if (inp == NULL) {
 794                 error = EINVAL;
 795                 goto bad;
 796         }
 797
 798         if (addr) {
 799                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 800                         error = EINVAL;
 801                         goto bad;
 802                 }
 803                 if (addr->sa_family != AF_INET6) {
 804                         error = EAFNOSUPPORT;
 805                         goto bad;
 806                 }
 807         }
 808
 809         if (!ip6_v6only) {
 810                 int hasv4addr;
 811                 struct sockaddr_in6 *sin6 = 0;
 812
 813                 if (addr == NULL)
 814                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 815                 else {
 816                         sin6 = (struct sockaddr_in6 *)addr;
 817                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 818                                 ? 1 : 0;
 819                 }
 820                 if (hasv4addr) {
 821                         const struct pr_usrreqs *pru;
 822
 823                         if (sin6)
 824                                 in6_sin6_2_sin_in_sock(addr);
 825                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 826                         pru->pru_send(msg);
 827                         /* msg invalid now */
 828                         return;
 829                 }
 830         }
 831
 832         error = udp6_output(inp, m, addr, control, td);
 833         lwkt_replymsg(&msg->send.base.lmsg, error);
 834         return;
 835 bad:
 836         m_freem(m);
 837         lwkt_replymsg(&msg->send.base.lmsg, error);
 838 }
 839
 840 struct pr_usrreqs udp6_usrreqs = {
 841         .pru_abort = udp6_abort,
 842         .pru_accept = pr_generic_notsupp,
 843         .pru_attach = udp6_attach,
 844         .pru_bind = udp6_bind,
 845         .pru_connect = udp6_connect,
 846         .pru_connect2 = pr_generic_notsupp,
 847         .pru_control = in6_control_dispatch,
 848         .pru_detach = udp6_detach,
 849         .pru_disconnect = udp6_disconnect,
 850         .pru_listen = pr_generic_notsupp,
 851         .pru_peeraddr = in6_mapped_peeraddr_dispatch,
 852         .pru_rcvd = pr_generic_notsupp,
 853         .pru_rcvoob = pr_generic_notsupp,
 854         .pru_send = udp6_send,
 855         .pru_sense = pru_sense_null,
 856         .pru_shutdown = udp_shutdown,
 857         .pru_sockaddr = in6_mapped_sockaddr_dispatch,
 858         .pru_sosend = sosend,
 859         .pru_soreceive = soreceive
 860 };
 861