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 90 #include <net/if.h> 91 #include <net/route.h> 92 #include <net/if_types.h> 93 94 #include <netinet/in.h> 95 #include <netinet/in_systm.h> 96 #include <netinet/ip.h> 97 #include <netinet/in_pcb.h> 98 #include <netinet/in_var.h> 99 #include <netinet/ip_var.h> 100 #include <netinet/udp.h> 101 #include <netinet/udp_var.h> 102 #include <netinet/ip6.h> 103 #include <netinet6/ip6_var.h> 104 #include <netinet6/in6_pcb.h> 105 #include <netinet/icmp6.h> 106 #include <netinet6/udp6_var.h> 107 #include <netinet6/ip6protosw.h> 108 109 #ifdef IPSEC 110 #include <netinet6/ipsec.h> 111 #include <netinet6/ipsec6.h> 112 #endif /* IPSEC */ 113 114 #ifdef FAST_IPSEC 115 #include <netproto/ipsec/ipsec.h> 116 #include <netproto/ipsec/ipsec6.h> 117 #endif /* FAST_IPSEC */ 118 119 /* 120 * UDP protocol inplementation. 121 * Per RFC 768, August, 1980. 122 */ 123 124 extern struct protosw inetsw[]; 125 static int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *); 126 static int udp6_detach (struct socket *so); 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; 159 160 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 161 162 ip6 = mtod(m, struct ip6_hdr *); 163 164 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 165 /* XXX send icmp6 host/port unreach? */ 166 m_freem(m); 167 return IPPROTO_DONE; 168 } 169 170 udpstat.udps_ipackets++; 171 172 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 173 uh = (struct udphdr *)((caddr_t)ip6 + off); 174 ulen = ntohs((u_short)uh->uh_ulen); 175 176 if (plen != ulen) { 177 udpstat.udps_badlen++; 178 goto bad; 179 } 180 181 /* 182 * Checksum extended UDP header and data. 183 */ 184 if (uh->uh_sum == 0) 185 udpstat.udps_nosum++; 186 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 187 udpstat.udps_badsum++; 188 goto bad; 189 } 190 191 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 192 struct inpcb *last; 193 194 /* 195 * Deliver a multicast datagram to all sockets 196 * for which the local and remote addresses and ports match 197 * those of the incoming datagram. This allows more than 198 * one process to receive multicasts on the same port. 199 * (This really ought to be done for unicast datagrams as 200 * well, but that would cause problems with existing 201 * applications that open both address-specific sockets and 202 * a wildcard socket listening to the same port -- they would 203 * end up receiving duplicates of every unicast datagram. 204 * Those applications open the multiple sockets to overcome an 205 * inadequacy of the UDP socket interface, but for backwards 206 * compatibility we avoid the problem here rather than 207 * fixing the interface. Maybe 4.5BSD will remedy this?) 208 */ 209 210 /* 211 * In a case that laddr should be set to the link-local 212 * address (this happens in RIPng), the multicast address 213 * specified in the received packet does not match with 214 * laddr. To cure this situation, the matching is relaxed 215 * if the receiving interface is the same as one specified 216 * in the socket and if the destination multicast address 217 * matches one of the multicast groups specified in the socket. 218 */ 219 220 /* 221 * Construct sockaddr format source address. 222 */ 223 init_sin6(&udp_in6, m); /* general init */ 224 udp_in6.sin6_port = uh->uh_sport; 225 /* 226 * KAME note: traditionally we dropped udpiphdr from mbuf here. 227 * We need udphdr for IPsec processing so we do that later. 228 */ 229 230 /* 231 * Locate pcb(s) for datagram. 232 * (Algorithm copied from raw_intr().) 233 */ 234 last = NULL; 235 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) { 236 if (in6p->inp_flags & INP_PLACEMARKER) 237 continue; 238 if (!(in6p->inp_vflag & INP_IPV6)) 239 continue; 240 if (in6p->in6p_lport != uh->uh_dport) 241 continue; 242 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 243 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 244 &ip6->ip6_dst) && 245 !in6_mcmatch(in6p, &ip6->ip6_dst, 246 m->m_pkthdr.rcvif)) 247 continue; 248 } 249 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 250 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 251 &ip6->ip6_src) || 252 in6p->in6p_fport != uh->uh_sport) 253 continue; 254 } 255 256 if (last != NULL) { 257 struct mbuf *n; 258 259 #ifdef IPSEC 260 /* 261 * Check AH/ESP integrity. 262 */ 263 if (ipsec6_in_reject_so(m, last->inp_socket)) 264 ipsec6stat.in_polvio++; 265 /* do not inject data into pcb */ 266 else 267 #endif /* IPSEC */ 268 #ifdef FAST_IPSEC 269 /* 270 * Check AH/ESP integrity. 271 */ 272 if (ipsec6_in_reject(m, last)) 273 ; 274 else 275 #endif /* FAST_IPSEC */ 276 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 277 /* 278 * KAME NOTE: do not 279 * m_copy(m, offset, ...) above. 280 * ssb_appendaddr() expects M_PKTHDR, 281 * and m_copy() will copy M_PKTHDR 282 * only if offset is 0. 283 */ 284 if (last->in6p_flags & IN6P_CONTROLOPTS 285 || last->in6p_socket->so_options & SO_TIMESTAMP) 286 ip6_savecontrol(last, &opts, 287 ip6, n); 288 289 m_adj(n, off + sizeof(struct udphdr)); 290 if (ssb_appendaddr(&last->in6p_socket->so_rcv, 291 (struct sockaddr *)&udp_in6, 292 n, opts) == 0) { 293 m_freem(n); 294 if (opts) 295 m_freem(opts); 296 udpstat.udps_fullsock++; 297 } else 298 sorwakeup(last->in6p_socket); 299 opts = NULL; 300 } 301 } 302 last = in6p; 303 /* 304 * Don't look for additional matches if this one does 305 * not have either the SO_REUSEPORT or SO_REUSEADDR 306 * socket options set. This heuristic avoids searching 307 * through all pcbs in the common case of a non-shared 308 * port. It assumes that an application will never 309 * clear these options after setting them. 310 */ 311 if ((last->in6p_socket->so_options & 312 (SO_REUSEPORT | SO_REUSEADDR)) == 0) 313 break; 314 } 315 316 if (last == NULL) { 317 /* 318 * No matching pcb found; discard datagram. 319 * (No need to send an ICMP Port Unreachable 320 * for a broadcast or multicast datgram.) 321 */ 322 udpstat.udps_noport++; 323 udpstat.udps_noportmcast++; 324 goto bad; 325 } 326 #ifdef IPSEC 327 /* 328 * Check AH/ESP integrity. 329 */ 330 if (ipsec6_in_reject_so(m, last->inp_socket)) { 331 ipsec6stat.in_polvio++; 332 goto bad; 333 } 334 #endif /* IPSEC */ 335 #ifdef FAST_IPSEC 336 /* 337 * Check AH/ESP integrity. 338 */ 339 if (ipsec6_in_reject(m, last)) { 340 goto bad; 341 } 342 #endif /* FAST_IPSEC */ 343 if (last->in6p_flags & IN6P_CONTROLOPTS 344 || last->in6p_socket->so_options & SO_TIMESTAMP) 345 ip6_savecontrol(last, &opts, ip6, m); 346 347 m_adj(m, off + sizeof(struct udphdr)); 348 if (ssb_appendaddr(&last->in6p_socket->so_rcv, 349 (struct sockaddr *)&udp_in6, 350 m, opts) == 0) { 351 udpstat.udps_fullsock++; 352 goto bad; 353 } 354 sorwakeup(last->in6p_socket); 355 return IPPROTO_DONE; 356 } 357 /* 358 * Locate pcb for datagram. 359 */ 360 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 361 &ip6->ip6_dst, uh->uh_dport, 1, 362 m->m_pkthdr.rcvif); 363 if (in6p == NULL) { 364 if (log_in_vain) { 365 char buf[INET6_ADDRSTRLEN]; 366 367 strcpy(buf, ip6_sprintf(&ip6->ip6_dst)); 368 log(LOG_INFO, 369 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 370 buf, ntohs(uh->uh_dport), 371 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)); 372 } 373 udpstat.udps_noport++; 374 if (m->m_flags & M_MCAST) { 375 kprintf("UDP6: M_MCAST is set in a unicast packet.\n"); 376 udpstat.udps_noportmcast++; 377 goto bad; 378 } 379 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 380 return IPPROTO_DONE; 381 } 382 #ifdef IPSEC 383 /* 384 * Check AH/ESP integrity. 385 */ 386 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) { 387 ipsec6stat.in_polvio++; 388 goto bad; 389 } 390 #endif /* IPSEC */ 391 #ifdef FAST_IPSEC 392 /* 393 * Check AH/ESP integrity. 394 */ 395 if (ipsec6_in_reject(m, in6p)) { 396 goto bad; 397 } 398 #endif /* FAST_IPSEC */ 399 400 /* 401 * Construct sockaddr format source address. 402 * Stuff source address and datagram in user buffer. 403 */ 404 init_sin6(&udp_in6, m); /* general init */ 405 udp_in6.sin6_port = uh->uh_sport; 406 if (in6p->in6p_flags & IN6P_CONTROLOPTS 407 || in6p->in6p_socket->so_options & SO_TIMESTAMP) 408 ip6_savecontrol(in6p, &opts, ip6, m); 409 m_adj(m, off + sizeof(struct udphdr)); 410 if (ssb_appendaddr(&in6p->in6p_socket->so_rcv, 411 (struct sockaddr *)&udp_in6, 412 m, opts) == 0) { 413 udpstat.udps_fullsock++; 414 goto bad; 415 } 416 sorwakeup(in6p->in6p_socket); 417 return IPPROTO_DONE; 418 bad: 419 if (m) 420 m_freem(m); 421 if (opts) 422 m_freem(opts); 423 return IPPROTO_DONE; 424 } 425 426 void 427 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 428 { 429 struct udphdr uh; 430 struct ip6_hdr *ip6; 431 struct mbuf *m; 432 int off = 0; 433 struct ip6ctlparam *ip6cp = NULL; 434 const struct sockaddr_in6 *sa6_src = NULL; 435 void (*notify) (struct inpcb *, int) = udp_notify; 436 struct udp_portonly { 437 u_int16_t uh_sport; 438 u_int16_t uh_dport; 439 } *uhp; 440 441 if (sa->sa_family != AF_INET6 || 442 sa->sa_len != sizeof(struct sockaddr_in6)) 443 return; 444 445 if ((unsigned)cmd >= PRC_NCMDS) 446 return; 447 if (PRC_IS_REDIRECT(cmd)) 448 notify = in6_rtchange, d = NULL; 449 else if (cmd == PRC_HOSTDEAD) 450 d = NULL; 451 else if (inet6ctlerrmap[cmd] == 0) 452 return; 453 454 /* if the parameter is from icmp6, decode it. */ 455 if (d != NULL) { 456 ip6cp = (struct ip6ctlparam *)d; 457 m = ip6cp->ip6c_m; 458 ip6 = ip6cp->ip6c_ip6; 459 off = ip6cp->ip6c_off; 460 sa6_src = ip6cp->ip6c_src; 461 } else { 462 m = NULL; 463 ip6 = NULL; 464 sa6_src = &sa6_any; 465 } 466 467 if (ip6) { 468 /* 469 * XXX: We assume that when IPV6 is non NULL, 470 * M and OFF are valid. 471 */ 472 473 /* check if we can safely examine src and dst ports */ 474 if (m->m_pkthdr.len < off + sizeof(*uhp)) 475 return; 476 477 bzero(&uh, sizeof(uh)); 478 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 479 480 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport, 481 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, 482 cmd, 0, notify); 483 } else 484 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0, 485 (const struct sockaddr *)sa6_src, 0, 486 cmd, 0, notify); 487 } 488 489 static int 490 udp6_getcred(SYSCTL_HANDLER_ARGS) 491 { 492 struct sockaddr_in6 addrs[2]; 493 struct inpcb *inp; 494 int error; 495 496 error = priv_check(req->td, PRIV_ROOT); 497 if (error) 498 return (error); 499 500 if (req->newlen != sizeof(addrs)) 501 return (EINVAL); 502 if (req->oldlen != sizeof(struct ucred)) 503 return (EINVAL); 504 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 505 if (error) 506 return (error); 507 crit_enter(); 508 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 509 addrs[1].sin6_port, 510 &addrs[0].sin6_addr, addrs[0].sin6_port, 511 1, NULL); 512 if (!inp || !inp->inp_socket) { 513 error = ENOENT; 514 goto out; 515 } 516 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, 517 sizeof(struct ucred)); 518 519 out: 520 crit_exit(); 521 return (error); 522 } 523 524 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 525 0, 0, 526 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection"); 527 528 /* 529 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 530 * will sofree() it when we return. 531 */ 532 static int 533 udp6_abort(struct socket *so) 534 { 535 struct inpcb *inp; 536 int error; 537 538 inp = so->so_pcb; 539 if (inp) { 540 soisdisconnected(so); 541 in6_pcbdetach(inp); 542 error = 0; 543 } else { 544 error = EINVAL; 545 } 546 547 return error; 548 } 549 550 static int 551 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai) 552 { 553 struct inpcb *inp; 554 int error; 555 556 inp = so->so_pcb; 557 if (inp != NULL) 558 return EINVAL; 559 560 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 561 error = soreserve(so, udp_sendspace, udp_recvspace, 562 ai->sb_rlimit); 563 if (error) 564 return error; 565 } 566 crit_enter(); 567 error = in_pcballoc(so, &udbinfo); 568 crit_exit(); 569 if (error) 570 return error; 571 so->so_port = udp_soport_attach(so); 572 inp = (struct inpcb *)so->so_pcb; 573 inp->inp_vflag |= INP_IPV6; 574 if (!ip6_v6only) 575 inp->inp_vflag |= INP_IPV4; 576 inp->in6p_hops = -1; /* use kernel default */ 577 inp->in6p_cksum = -1; /* just to be sure */ 578 /* 579 * XXX: ugly!! 580 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 581 * because the socket may be bound to an IPv6 wildcard address, 582 * which may match an IPv4-mapped IPv6 address. 583 */ 584 inp->inp_ip_ttl = ip_defttl; 585 return 0; 586 } 587 588 static int 589 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 590 { 591 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam; 592 struct inpcb *inp; 593 int error; 594 595 inp = so->so_pcb; 596 if (inp == NULL) 597 return EINVAL; 598 599 inp->inp_vflag &= ~INP_IPV4; 600 inp->inp_vflag |= INP_IPV6; 601 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) { 602 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 603 inp->inp_vflag |= INP_IPV4; 604 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 605 struct sockaddr_in sin; 606 607 in6_sin6_2_sin(&sin, sin6_p); 608 inp->inp_vflag |= INP_IPV4; 609 inp->inp_vflag &= ~INP_IPV6; 610 crit_enter(); 611 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 612 crit_exit(); 613 return error; 614 } 615 } 616 617 crit_enter(); 618 error = in6_pcbbind(inp, nam, td); 619 crit_exit(); 620 if (error == 0) { 621 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 622 inp->inp_flags |= INP_WASBOUND_NOTANY; 623 in_pcbinswildcardhash(inp); 624 } 625 return error; 626 } 627 628 static int 629 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 630 { 631 struct inpcb *inp; 632 int error; 633 634 inp = so->so_pcb; 635 if (inp == NULL) 636 return EINVAL; 637 638 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) { 639 struct sockaddr_in6 *sin6_p; 640 641 sin6_p = (struct sockaddr_in6 *)nam; 642 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 643 struct sockaddr_in sin; 644 645 if (inp->inp_faddr.s_addr != INADDR_ANY) 646 return EISCONN; 647 in6_sin6_2_sin(&sin, sin6_p); 648 crit_enter(); 649 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td); 650 crit_exit(); 651 if (error == 0) { 652 inp->inp_vflag |= INP_IPV4; 653 inp->inp_vflag &= ~INP_IPV6; 654 soisconnected(so); 655 } 656 return error; 657 } 658 } 659 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 660 return EISCONN; 661 if (inp->inp_flags & INP_WILDCARD) 662 in_pcbremwildcardhash(inp); 663 if (!prison_remote_ip(td, nam)) 664 return(EAFNOSUPPORT); /* IPv4 only jail */ 665 crit_enter(); 666 error = in6_pcbconnect(inp, nam, td); 667 crit_exit(); 668 if (error == 0) { 669 if (!ip6_v6only) { /* should be non mapped addr */ 670 inp->inp_vflag &= ~INP_IPV4; 671 inp->inp_vflag |= INP_IPV6; 672 } 673 /* sosetport(so, port); here, see udp v4 code */ 674 soisconnected(so); 675 } else if (error == EAFNOSUPPORT) { /* connection dissolved */ 676 /* 677 * Follow traditional BSD behavior and retain 678 * the local port binding. But, fix the old misbehavior 679 * of overwriting any previously bound local address. 680 */ 681 if (!(inp->inp_flags & INP_WASBOUND_NOTANY)) 682 inp->in6p_laddr = kin6addr_any; 683 in_pcbinswildcardhash(inp); 684 } 685 return error; 686 } 687 688 static int 689 udp6_detach(struct socket *so) 690 { 691 struct inpcb *inp; 692 693 inp = so->so_pcb; 694 if (inp == NULL) 695 return EINVAL; 696 crit_enter(); 697 in6_pcbdetach(inp); 698 crit_exit(); 699 return 0; 700 } 701 702 static int 703 udp6_disconnect(struct socket *so) 704 { 705 struct inpcb *inp; 706 707 inp = so->so_pcb; 708 if (inp == NULL) 709 return EINVAL; 710 711 if (inp->inp_vflag & INP_IPV4) { 712 const struct pr_usrreqs *pru; 713 714 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 715 return ((*pru->pru_disconnect)(so)); 716 } 717 718 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 719 return ENOTCONN; 720 721 crit_enter(); 722 in6_pcbdisconnect(inp); 723 crit_exit(); 724 soclrstate(so, SS_ISCONNECTED); /* XXX */ 725 return 0; 726 } 727 728 static int 729 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 730 struct mbuf *control, struct thread *td) 731 { 732 struct inpcb *inp; 733 int error = 0; 734 735 inp = so->so_pcb; 736 if (inp == NULL) { 737 error = EINVAL; 738 goto bad; 739 } 740 741 if (addr) { 742 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 743 error = EINVAL; 744 goto bad; 745 } 746 if (addr->sa_family != AF_INET6) { 747 error = EAFNOSUPPORT; 748 goto bad; 749 } 750 } 751 752 if (!ip6_v6only) { 753 int hasv4addr; 754 struct sockaddr_in6 *sin6 = 0; 755 756 if (addr == NULL) 757 hasv4addr = (inp->inp_vflag & INP_IPV4); 758 else { 759 sin6 = (struct sockaddr_in6 *)addr; 760 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 761 ? 1 : 0; 762 } 763 if (hasv4addr) { 764 const struct pr_usrreqs *pru; 765 766 if (sin6) 767 in6_sin6_2_sin_in_sock(addr); 768 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 769 error = ((*pru->pru_send)(so, flags, m, addr, 770 control, td)); 771 /* addr will just be freed in sendit(). */ 772 return error; 773 } 774 } 775 776 return udp6_output(inp, m, addr, control, td); 777 778 bad: 779 m_freem(m); 780 return (error); 781 } 782 783 struct pr_usrreqs udp6_usrreqs = { 784 .pru_abort = udp6_abort, 785 .pru_accept = pru_accept_notsupp, 786 .pru_attach = udp6_attach, 787 .pru_bind = udp6_bind, 788 .pru_connect = udp6_connect, 789 .pru_connect2 = pru_connect2_notsupp, 790 .pru_control = in6_control, 791 .pru_detach = udp6_detach, 792 .pru_disconnect = udp6_disconnect, 793 .pru_listen = pru_listen_notsupp, 794 .pru_peeraddr = in6_mapped_peeraddr, 795 .pru_rcvd = pru_rcvd_notsupp, 796 .pru_rcvoob = pru_rcvoob_notsupp, 797 .pru_send = udp6_send, 798 .pru_sense = pru_sense_null, 799 .pru_shutdown = udp_shutdown, 800 .pru_sockaddr = in6_mapped_sockaddr, 801 .pru_sosend = sosend, 802 .pru_soreceive = soreceive 803 }; 804 805