1 /* $FreeBSD$ */ 2 /* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */ 3 4 /*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /*- 34 * Copyright (c) 1982, 1986, 1989, 1993 35 * The Regents of the University of California. 36 * 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 * 4. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 63 */ 64 65 #include "opt_inet.h" 66 #include "opt_inet6.h" 67 #include "opt_ipsec.h" 68 69 #include <sys/param.h> 70 #include <sys/errno.h> 71 #include <sys/kernel.h> 72 #include <sys/lock.h> 73 #include <sys/mbuf.h> 74 #include <sys/priv.h> 75 #include <sys/proc.h> 76 #include <sys/protosw.h> 77 #include <sys/signalvar.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/stat.h> 81 #include <sys/sx.h> 82 #include <sys/sysctl.h> 83 #include <sys/syslog.h> 84 #include <sys/systm.h> 85 86 #include <net/if.h> 87 #include <net/if_types.h> 88 #include <net/route.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_pcb.h> 92 #include <netinet/in_systm.h> 93 #include <netinet/in_var.h> 94 #include <netinet/ip.h> 95 #include <netinet/ip6.h> 96 #include <netinet/icmp6.h> 97 #include <netinet/ip_var.h> 98 #include <netinet/udp.h> 99 #include <netinet/udp_var.h> 100 #include <netinet6/ip6protosw.h> 101 #include <netinet6/ip6_var.h> 102 #include <netinet6/in6_pcb.h> 103 #include <netinet6/udp6_var.h> 104 #include <netinet6/scope6_var.h> 105 106 #ifdef IPSEC 107 #include <netipsec/ipsec.h> 108 #include <netipsec/ipsec6.h> 109 #endif /* IPSEC */ 110 111 /* 112 * UDP protocol inplementation. 113 * Per RFC 768, August, 1980. 114 */ 115 116 extern struct protosw inetsw[]; 117 static void udp6_detach(struct socket *so); 118 119 static void 120 udp6_append(struct inpcb *in6p, struct mbuf *n, int off, 121 struct sockaddr_in6 *fromsa) 122 { 123 struct socket *so; 124 struct mbuf *opts; 125 126 INP_LOCK_ASSERT(in6p); 127 128 #ifdef IPSEC 129 /* Check AH/ESP integrity. */ 130 if (ipsec6_in_reject(n, in6p)) { 131 m_freem(n); 132 ipsec6stat.in_polvio++; 133 return; 134 } 135 #endif /* IPSEC */ 136 137 opts = NULL; 138 if (in6p->in6p_flags & IN6P_CONTROLOPTS || 139 in6p->inp_socket->so_options & SO_TIMESTAMP) 140 ip6_savecontrol(in6p, n, &opts); 141 m_adj(n, off + sizeof(struct udphdr)); 142 143 so = in6p->inp_socket; 144 SOCKBUF_LOCK(&so->so_rcv); 145 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 146 opts) == 0) { 147 SOCKBUF_UNLOCK(&so->so_rcv); 148 m_freem(n); 149 if (opts) 150 m_freem(opts); 151 udpstat.udps_fullsock++; 152 } else 153 sorwakeup_locked(so); 154 } 155 156 int 157 udp6_input(struct mbuf **mp, int *offp, int proto) 158 { 159 struct mbuf *m = *mp; 160 struct ip6_hdr *ip6; 161 struct udphdr *uh; 162 struct inpcb *in6p; 163 int off = *offp; 164 int plen, ulen; 165 struct sockaddr_in6 fromsa; 166 167 ip6 = mtod(m, struct ip6_hdr *); 168 169 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 170 /* XXX send icmp6 host/port unreach? */ 171 m_freem(m); 172 return (IPPROTO_DONE); 173 } 174 175 #ifndef PULLDOWN_TEST 176 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 177 ip6 = mtod(m, struct ip6_hdr *); 178 uh = (struct udphdr *)((caddr_t)ip6 + off); 179 #else 180 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 181 if (!uh) 182 return (IPPROTO_DONE); 183 #endif 184 185 udpstat.udps_ipackets++; 186 187 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 188 ulen = ntohs((u_short)uh->uh_ulen); 189 190 if (plen != ulen) { 191 udpstat.udps_badlen++; 192 goto badunlocked; 193 } 194 195 /* 196 * Checksum extended UDP header and data. 197 */ 198 if (uh->uh_sum == 0) { 199 udpstat.udps_nosum++; 200 goto badunlocked; 201 } 202 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 203 udpstat.udps_badsum++; 204 goto badunlocked; 205 } 206 207 /* 208 * Construct sockaddr format source address. 209 */ 210 init_sin6(&fromsa, m); 211 fromsa.sin6_port = uh->uh_sport; 212 213 INP_INFO_RLOCK(&udbinfo); 214 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 215 struct inpcb *last; 216 217 /* 218 * In the event that laddr should be set to the link-local 219 * address (this happens in RIPng), the multicast address 220 * specified in the received packet will not match laddr. To 221 * handle this situation, matching is relaxed if the 222 * receiving interface is the same as one specified in the 223 * socket and if the destination multicast address matches 224 * one of the multicast groups specified in the socket. 225 */ 226 227 /* 228 * KAME note: traditionally we dropped udpiphdr from mbuf 229 * here. We need udphdr for IPsec processing so we do that 230 * later. 231 */ 232 last = NULL; 233 LIST_FOREACH(in6p, &udb, inp_list) { 234 if ((in6p->inp_vflag & INP_IPV6) == 0) 235 continue; 236 if (in6p->in6p_lport != uh->uh_dport) 237 continue; 238 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 239 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 240 &ip6->ip6_dst)) 241 continue; 242 } 243 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 244 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 245 &ip6->ip6_src) || 246 in6p->in6p_fport != uh->uh_sport) 247 continue; 248 } 249 250 if (last != NULL) { 251 struct mbuf *n; 252 253 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 254 INP_LOCK(last); 255 udp6_append(last, n, off, &fromsa); 256 INP_UNLOCK(last); 257 } 258 } 259 last = in6p; 260 /* 261 * Don't look for additional matches if this one does 262 * not have either the SO_REUSEPORT or SO_REUSEADDR 263 * socket options set. This heuristic avoids 264 * searching through all pcbs in the common case of a 265 * non-shared port. It assumes that an application 266 * will never clear these options after setting them. 267 */ 268 if ((last->in6p_socket->so_options & 269 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 270 break; 271 } 272 273 if (last == NULL) { 274 /* 275 * No matching pcb found; discard datagram. (No need 276 * to send an ICMP Port Unreachable for a broadcast 277 * or multicast datgram.) 278 */ 279 udpstat.udps_noport++; 280 udpstat.udps_noportmcast++; 281 goto badheadlocked; 282 } 283 INP_LOCK(last); 284 udp6_append(last, m, off, &fromsa); 285 INP_UNLOCK(last); 286 INP_INFO_RUNLOCK(&udbinfo); 287 return (IPPROTO_DONE); 288 } 289 /* 290 * Locate pcb for datagram. 291 */ 292 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 293 &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 294 if (in6p == NULL) { 295 if (udp_log_in_vain) { 296 char ip6bufs[INET6_ADDRSTRLEN]; 297 char ip6bufd[INET6_ADDRSTRLEN]; 298 299 log(LOG_INFO, 300 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 301 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 302 ntohs(uh->uh_dport), 303 ip6_sprintf(ip6bufs, &ip6->ip6_src), 304 ntohs(uh->uh_sport)); 305 } 306 udpstat.udps_noport++; 307 if (m->m_flags & M_MCAST) { 308 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 309 udpstat.udps_noportmcast++; 310 goto badheadlocked; 311 } 312 INP_INFO_RUNLOCK(&udbinfo); 313 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 314 return (IPPROTO_DONE); 315 } 316 INP_LOCK(in6p); 317 udp6_append(in6p, m, off, &fromsa); 318 INP_UNLOCK(in6p); 319 INP_INFO_RUNLOCK(&udbinfo); 320 return (IPPROTO_DONE); 321 badheadlocked: 322 INP_INFO_RUNLOCK(&udbinfo); 323 badunlocked: 324 if (m) 325 m_freem(m); 326 return (IPPROTO_DONE); 327 } 328 329 void 330 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 331 { 332 struct udphdr uh; 333 struct ip6_hdr *ip6; 334 struct mbuf *m; 335 int off = 0; 336 struct ip6ctlparam *ip6cp = NULL; 337 const struct sockaddr_in6 *sa6_src = NULL; 338 void *cmdarg; 339 struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify; 340 struct udp_portonly { 341 u_int16_t uh_sport; 342 u_int16_t uh_dport; 343 } *uhp; 344 345 if (sa->sa_family != AF_INET6 || 346 sa->sa_len != sizeof(struct sockaddr_in6)) 347 return; 348 349 if ((unsigned)cmd >= PRC_NCMDS) 350 return; 351 if (PRC_IS_REDIRECT(cmd)) 352 notify = in6_rtchange, d = NULL; 353 else if (cmd == PRC_HOSTDEAD) 354 d = NULL; 355 else if (inet6ctlerrmap[cmd] == 0) 356 return; 357 358 /* if the parameter is from icmp6, decode it. */ 359 if (d != NULL) { 360 ip6cp = (struct ip6ctlparam *)d; 361 m = ip6cp->ip6c_m; 362 ip6 = ip6cp->ip6c_ip6; 363 off = ip6cp->ip6c_off; 364 cmdarg = ip6cp->ip6c_cmdarg; 365 sa6_src = ip6cp->ip6c_src; 366 } else { 367 m = NULL; 368 ip6 = NULL; 369 cmdarg = NULL; 370 sa6_src = &sa6_any; 371 } 372 373 if (ip6) { 374 /* 375 * XXX: We assume that when IPV6 is non NULL, 376 * M and OFF are valid. 377 */ 378 379 /* Check if we can safely examine src and dst ports. */ 380 if (m->m_pkthdr.len < off + sizeof(*uhp)) 381 return; 382 383 bzero(&uh, sizeof(uh)); 384 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 385 386 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport, 387 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 388 cmdarg, notify); 389 } else 390 (void) in6_pcbnotify(&udbinfo, sa, 0, 391 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 392 } 393 394 static int 395 udp6_getcred(SYSCTL_HANDLER_ARGS) 396 { 397 struct xucred xuc; 398 struct sockaddr_in6 addrs[2]; 399 struct inpcb *inp; 400 int error; 401 402 error = priv_check(req->td, PRIV_NETINET_GETCRED); 403 if (error) 404 return (error); 405 406 if (req->newlen != sizeof(addrs)) 407 return (EINVAL); 408 if (req->oldlen != sizeof(struct xucred)) 409 return (EINVAL); 410 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 411 if (error) 412 return (error); 413 if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 || 414 (error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) { 415 return (error); 416 } 417 INP_INFO_RLOCK(&udbinfo); 418 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 419 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1, 420 NULL); 421 if (inp == NULL) { 422 INP_INFO_RUNLOCK(&udbinfo); 423 return (ENOENT); 424 } 425 INP_LOCK(inp); 426 KASSERT(inp->inp_socket != NULL, 427 ("udp6_getcred: inp_socket == NULL")); 428 /* 429 * XXXRW: There should be a scoping access control check here. 430 */ 431 cru2x(inp->inp_socket->so_cred, &xuc); 432 INP_UNLOCK(inp); 433 INP_INFO_RUNLOCK(&udbinfo); 434 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 435 return (error); 436 } 437 438 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 439 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 440 441 static void 442 udp6_abort(struct socket *so) 443 { 444 struct inpcb *inp; 445 446 inp = sotoinpcb(so); 447 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 448 449 #ifdef INET 450 if (inp->inp_vflag & INP_IPV4) { 451 struct pr_usrreqs *pru; 452 453 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 454 (*pru->pru_abort)(so); 455 return; 456 } 457 #endif 458 459 INP_INFO_WLOCK(&udbinfo); 460 INP_LOCK(inp); 461 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 462 in6_pcbdisconnect(inp); 463 inp->in6p_laddr = in6addr_any; 464 soisdisconnected(so); 465 } 466 INP_UNLOCK(inp); 467 INP_INFO_WUNLOCK(&udbinfo); 468 } 469 470 static int 471 udp6_attach(struct socket *so, int proto, struct thread *td) 472 { 473 struct inpcb *inp; 474 int error; 475 476 inp = sotoinpcb(so); 477 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 478 479 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 480 error = soreserve(so, udp_sendspace, udp_recvspace); 481 if (error) 482 return (error); 483 } 484 INP_INFO_WLOCK(&udbinfo); 485 error = in_pcballoc(so, &udbinfo); 486 if (error) { 487 INP_INFO_WUNLOCK(&udbinfo); 488 return (error); 489 } 490 inp = (struct inpcb *)so->so_pcb; 491 INP_INFO_WUNLOCK(&udbinfo); 492 inp->inp_vflag |= INP_IPV6; 493 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 494 inp->inp_vflag |= INP_IPV4; 495 inp->in6p_hops = -1; /* use kernel default */ 496 inp->in6p_cksum = -1; /* just to be sure */ 497 /* 498 * XXX: ugly!! 499 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 500 * because the socket may be bound to an IPv6 wildcard address, 501 * which may match an IPv4-mapped IPv6 address. 502 */ 503 inp->inp_ip_ttl = ip_defttl; 504 INP_UNLOCK(inp); 505 return (0); 506 } 507 508 static int 509 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 510 { 511 struct inpcb *inp; 512 int error; 513 514 inp = sotoinpcb(so); 515 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 516 517 INP_INFO_WLOCK(&udbinfo); 518 INP_LOCK(inp); 519 inp->inp_vflag &= ~INP_IPV4; 520 inp->inp_vflag |= INP_IPV6; 521 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 522 struct sockaddr_in6 *sin6_p; 523 524 sin6_p = (struct sockaddr_in6 *)nam; 525 526 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 527 inp->inp_vflag |= INP_IPV4; 528 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 529 struct sockaddr_in sin; 530 531 in6_sin6_2_sin(&sin, sin6_p); 532 inp->inp_vflag |= INP_IPV4; 533 inp->inp_vflag &= ~INP_IPV6; 534 error = in_pcbbind(inp, (struct sockaddr *)&sin, 535 td->td_ucred); 536 goto out; 537 } 538 } 539 540 error = in6_pcbbind(inp, nam, td->td_ucred); 541 out: 542 INP_UNLOCK(inp); 543 INP_INFO_WUNLOCK(&udbinfo); 544 return (error); 545 } 546 547 static void 548 udp6_close(struct socket *so) 549 { 550 struct inpcb *inp; 551 552 inp = sotoinpcb(so); 553 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 554 555 #ifdef INET 556 if (inp->inp_vflag & INP_IPV4) { 557 struct pr_usrreqs *pru; 558 559 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 560 (*pru->pru_disconnect)(so); 561 return; 562 } 563 #endif 564 INP_INFO_WLOCK(&udbinfo); 565 INP_LOCK(inp); 566 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 567 in6_pcbdisconnect(inp); 568 inp->in6p_laddr = in6addr_any; 569 soisdisconnected(so); 570 } 571 INP_UNLOCK(inp); 572 INP_INFO_WUNLOCK(&udbinfo); 573 } 574 575 static int 576 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 577 { 578 struct inpcb *inp; 579 int error; 580 581 inp = sotoinpcb(so); 582 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 583 584 INP_INFO_WLOCK(&udbinfo); 585 INP_LOCK(inp); 586 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 587 struct sockaddr_in6 *sin6_p; 588 589 sin6_p = (struct sockaddr_in6 *)nam; 590 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 591 struct sockaddr_in sin; 592 593 if (inp->inp_faddr.s_addr != INADDR_ANY) { 594 error = EISCONN; 595 goto out; 596 } 597 in6_sin6_2_sin(&sin, sin6_p); 598 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 599 td->td_ucred); 600 if (error == 0) { 601 inp->inp_vflag |= INP_IPV4; 602 inp->inp_vflag &= ~INP_IPV6; 603 soisconnected(so); 604 } 605 goto out; 606 } 607 } 608 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 609 error = EISCONN; 610 goto out; 611 } 612 error = in6_pcbconnect(inp, nam, td->td_ucred); 613 if (error == 0) { 614 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 615 /* should be non mapped addr */ 616 inp->inp_vflag &= ~INP_IPV4; 617 inp->inp_vflag |= INP_IPV6; 618 } 619 soisconnected(so); 620 } 621 out: 622 INP_UNLOCK(inp); 623 INP_INFO_WUNLOCK(&udbinfo); 624 return (error); 625 } 626 627 static void 628 udp6_detach(struct socket *so) 629 { 630 struct inpcb *inp; 631 632 inp = sotoinpcb(so); 633 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 634 635 INP_INFO_WLOCK(&udbinfo); 636 INP_LOCK(inp); 637 in6_pcbdetach(inp); 638 in6_pcbfree(inp); 639 INP_INFO_WUNLOCK(&udbinfo); 640 } 641 642 static int 643 udp6_disconnect(struct socket *so) 644 { 645 struct inpcb *inp; 646 int error; 647 648 inp = sotoinpcb(so); 649 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 650 651 INP_INFO_WLOCK(&udbinfo); 652 INP_LOCK(inp); 653 654 #ifdef INET 655 if (inp->inp_vflag & INP_IPV4) { 656 struct pr_usrreqs *pru; 657 658 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 659 error = (*pru->pru_disconnect)(so); 660 goto out; 661 } 662 #endif 663 664 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 665 error = ENOTCONN; 666 goto out; 667 } 668 669 in6_pcbdisconnect(inp); 670 inp->in6p_laddr = in6addr_any; 671 /* XXXRW: so_state locking? */ 672 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 673 out: 674 INP_UNLOCK(inp); 675 INP_INFO_WUNLOCK(&udbinfo); 676 return (0); 677 } 678 679 static int 680 udp6_send(struct socket *so, int flags, struct mbuf *m, 681 struct sockaddr *addr, struct mbuf *control, struct thread *td) 682 { 683 struct inpcb *inp; 684 int error = 0; 685 686 inp = sotoinpcb(so); 687 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 688 689 INP_INFO_WLOCK(&udbinfo); 690 INP_LOCK(inp); 691 if (addr) { 692 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 693 error = EINVAL; 694 goto bad; 695 } 696 if (addr->sa_family != AF_INET6) { 697 error = EAFNOSUPPORT; 698 goto bad; 699 } 700 } 701 702 #ifdef INET 703 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 704 int hasv4addr; 705 struct sockaddr_in6 *sin6 = 0; 706 707 if (addr == 0) 708 hasv4addr = (inp->inp_vflag & INP_IPV4); 709 else { 710 sin6 = (struct sockaddr_in6 *)addr; 711 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 712 ? 1 : 0; 713 } 714 if (hasv4addr) { 715 struct pr_usrreqs *pru; 716 717 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 718 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 719 /* 720 * When remote addr is IPv4-mapped address, 721 * local addr should not be an IPv6 address; 722 * since you cannot determine how to map IPv6 723 * source address to IPv4. 724 */ 725 error = EINVAL; 726 goto out; 727 } 728 if (sin6) 729 in6_sin6_2_sin_in_sock(addr); 730 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 731 error = ((*pru->pru_send)(so, flags, m, addr, control, 732 td)); 733 /* addr will just be freed in sendit(). */ 734 goto out; 735 } 736 } 737 #endif 738 739 error = udp6_output(inp, m, addr, control, td); 740 out: 741 INP_UNLOCK(inp); 742 INP_INFO_WUNLOCK(&udbinfo); 743 return (error); 744 745 bad: 746 INP_UNLOCK(inp); 747 INP_INFO_WUNLOCK(&udbinfo); 748 m_freem(m); 749 return (error); 750 } 751 752 struct pr_usrreqs udp6_usrreqs = { 753 .pru_abort = udp6_abort, 754 .pru_attach = udp6_attach, 755 .pru_bind = udp6_bind, 756 .pru_connect = udp6_connect, 757 .pru_control = in6_control, 758 .pru_detach = udp6_detach, 759 .pru_disconnect = udp6_disconnect, 760 .pru_peeraddr = in6_mapped_peeraddr, 761 .pru_send = udp6_send, 762 .pru_shutdown = udp_shutdown, 763 .pru_sockaddr = in6_mapped_sockaddr, 764 .pru_sosetlabel = in_pcbsosetlabel, 765 .pru_close = udp6_close 766 }; 767