udp6_usrreq.c revision 171508
1/* $FreeBSD: head/sys/netinet6/udp6_usrreq.c 171508 2007-07-19 22:34:25Z rwatson $ */ 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#include "opt_mac.h" 69 70#include <sys/param.h> 71#include <sys/errno.h> 72#include <sys/kernel.h> 73#include <sys/lock.h> 74#include <sys/mbuf.h> 75#include <sys/priv.h> 76#include <sys/proc.h> 77#include <sys/protosw.h> 78#include <sys/signalvar.h> 79#include <sys/socket.h> 80#include <sys/socketvar.h> 81#include <sys/stat.h> 82#include <sys/sx.h> 83#include <sys/sysctl.h> 84#include <sys/syslog.h> 85#include <sys/systm.h> 86 87#include <net/if.h> 88#include <net/if_types.h> 89#include <net/route.h> 90 91#include <netinet/in.h> 92#include <netinet/in_pcb.h> 93#include <netinet/in_systm.h> 94#include <netinet/in_var.h> 95#include <netinet/ip.h> 96#include <netinet/ip_icmp.h> 97#include <netinet/ip6.h> 98#include <netinet/icmp_var.h> 99#include <netinet/icmp6.h> 100#include <netinet/ip_var.h> 101#include <netinet/udp.h> 102#include <netinet/udp_var.h> 103#include <netinet6/ip6protosw.h> 104#include <netinet6/ip6_var.h> 105#include <netinet6/in6_pcb.h> 106#include <netinet6/udp6_var.h> 107#include <netinet6/scope6_var.h> 108 109#ifdef IPSEC 110#include <netipsec/ipsec.h> 111#include <netipsec/ipsec6.h> 112#endif /* IPSEC */ 113 114#include <security/mac/mac_framework.h> 115 116/* 117 * UDP protocol inplementation. 118 * Per RFC 768, August, 1980. 119 */ 120 121extern struct protosw inetsw[]; 122static void udp6_detach(struct socket *so); 123 124static void 125udp6_append(struct inpcb *in6p, struct mbuf *n, int off, 126 struct sockaddr_in6 *fromsa) 127{ 128 struct socket *so; 129 struct mbuf *opts; 130 131 INP_LOCK_ASSERT(in6p); 132 133#ifdef IPSEC 134 /* Check AH/ESP integrity. */ 135 if (ipsec6_in_reject(n, in6p)) { 136 m_freem(n); 137 ipsec6stat.in_polvio++; 138 return; 139 } 140#endif /* IPSEC */ 141#ifdef MAC 142 if (mac_check_inpcb_deliver(in6p, n) != 0) { 143 m_freem(n); 144 return; 145 } 146#endif 147 opts = NULL; 148 if (in6p->in6p_flags & IN6P_CONTROLOPTS || 149 in6p->inp_socket->so_options & SO_TIMESTAMP) 150 ip6_savecontrol(in6p, n, &opts); 151 m_adj(n, off + sizeof(struct udphdr)); 152 153 so = in6p->inp_socket; 154 SOCKBUF_LOCK(&so->so_rcv); 155 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 156 opts) == 0) { 157 SOCKBUF_UNLOCK(&so->so_rcv); 158 m_freem(n); 159 if (opts) 160 m_freem(opts); 161 udpstat.udps_fullsock++; 162 } else 163 sorwakeup_locked(so); 164} 165 166int 167udp6_input(struct mbuf **mp, int *offp, int proto) 168{ 169 struct mbuf *m = *mp; 170 struct ip6_hdr *ip6; 171 struct udphdr *uh; 172 struct inpcb *in6p; 173 int off = *offp; 174 int plen, ulen; 175 struct sockaddr_in6 fromsa; 176 177 ip6 = mtod(m, struct ip6_hdr *); 178 179 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 180 /* XXX send icmp6 host/port unreach? */ 181 m_freem(m); 182 return (IPPROTO_DONE); 183 } 184 185#ifndef PULLDOWN_TEST 186 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 187 ip6 = mtod(m, struct ip6_hdr *); 188 uh = (struct udphdr *)((caddr_t)ip6 + off); 189#else 190 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 191 if (!uh) 192 return (IPPROTO_DONE); 193#endif 194 195 udpstat.udps_ipackets++; 196 197 /* 198 * Destination port of 0 is illegal, based on RFC768. 199 */ 200 if (uh->uh_dport == 0) 201 goto badunlocked; 202 203 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 204 ulen = ntohs((u_short)uh->uh_ulen); 205 206 if (plen != ulen) { 207 udpstat.udps_badlen++; 208 goto badunlocked; 209 } 210 211 /* 212 * Checksum extended UDP header and data. 213 */ 214 if (uh->uh_sum == 0) { 215 udpstat.udps_nosum++; 216 goto badunlocked; 217 } 218 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 219 udpstat.udps_badsum++; 220 goto badunlocked; 221 } 222 223 /* 224 * Construct sockaddr format source address. 225 */ 226 init_sin6(&fromsa, m); 227 fromsa.sin6_port = uh->uh_sport; 228 229 INP_INFO_RLOCK(&udbinfo); 230 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 231 struct inpcb *last; 232 233 /* 234 * In the event that laddr should be set to the link-local 235 * address (this happens in RIPng), the multicast address 236 * specified in the received packet will not match laddr. To 237 * handle this situation, matching is relaxed if the 238 * receiving interface is the same as one specified in the 239 * socket and if the destination multicast address matches 240 * one of the multicast groups specified in the socket. 241 */ 242 243 /* 244 * KAME note: traditionally we dropped udpiphdr from mbuf 245 * here. We need udphdr for IPsec processing so we do that 246 * later. 247 */ 248 last = NULL; 249 LIST_FOREACH(in6p, &udb, inp_list) { 250 if ((in6p->inp_vflag & INP_IPV6) == 0) 251 continue; 252 if (in6p->in6p_lport != uh->uh_dport) 253 continue; 254 /* 255 * XXX: Do not check source port of incoming datagram 256 * unless inp_connect() has been called to bind the 257 * fport part of the 4-tuple; the source could be 258 * trying to talk to us with an ephemeral port. 259 */ 260 if (in6p->inp_fport != 0 && 261 in6p->inp_fport != uh->uh_sport) 262 continue; 263 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 264 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 265 &ip6->ip6_dst)) 266 continue; 267 } 268 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 269 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 270 &ip6->ip6_src) || 271 in6p->in6p_fport != uh->uh_sport) 272 continue; 273 } 274 275 if (last != NULL) { 276 struct mbuf *n; 277 278 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 279 INP_LOCK(last); 280 udp6_append(last, n, off, &fromsa); 281 INP_UNLOCK(last); 282 } 283 } 284 last = in6p; 285 /* 286 * Don't look for additional matches if this one does 287 * not have either the SO_REUSEPORT or SO_REUSEADDR 288 * socket options set. This heuristic avoids 289 * searching through all pcbs in the common case of a 290 * non-shared port. It assumes that an application 291 * will never clear these options after setting them. 292 */ 293 if ((last->in6p_socket->so_options & 294 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 295 break; 296 } 297 298 if (last == NULL) { 299 /* 300 * No matching pcb found; discard datagram. (No need 301 * to send an ICMP Port Unreachable for a broadcast 302 * or multicast datgram.) 303 */ 304 udpstat.udps_noport++; 305 udpstat.udps_noportmcast++; 306 goto badheadlocked; 307 } 308 INP_LOCK(last); 309 udp6_append(last, m, off, &fromsa); 310 INP_UNLOCK(last); 311 INP_INFO_RUNLOCK(&udbinfo); 312 return (IPPROTO_DONE); 313 } 314 /* 315 * Locate pcb for datagram. 316 */ 317 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 318 &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 319 if (in6p == NULL) { 320 if (udp_log_in_vain) { 321 char ip6bufs[INET6_ADDRSTRLEN]; 322 char ip6bufd[INET6_ADDRSTRLEN]; 323 324 log(LOG_INFO, 325 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 326 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 327 ntohs(uh->uh_dport), 328 ip6_sprintf(ip6bufs, &ip6->ip6_src), 329 ntohs(uh->uh_sport)); 330 } 331 udpstat.udps_noport++; 332 if (m->m_flags & M_MCAST) { 333 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 334 udpstat.udps_noportmcast++; 335 goto badheadlocked; 336 } 337 INP_INFO_RUNLOCK(&udbinfo); 338 if (udp_blackhole) 339 goto badunlocked; 340 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 341 goto badunlocked; 342 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 343 return (IPPROTO_DONE); 344 } 345 INP_LOCK(in6p); 346 udp6_append(in6p, m, off, &fromsa); 347 INP_UNLOCK(in6p); 348 INP_INFO_RUNLOCK(&udbinfo); 349 return (IPPROTO_DONE); 350 351badheadlocked: 352 INP_INFO_RUNLOCK(&udbinfo); 353badunlocked: 354 if (m) 355 m_freem(m); 356 return (IPPROTO_DONE); 357} 358 359void 360udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 361{ 362 struct udphdr uh; 363 struct ip6_hdr *ip6; 364 struct mbuf *m; 365 int off = 0; 366 struct ip6ctlparam *ip6cp = NULL; 367 const struct sockaddr_in6 *sa6_src = NULL; 368 void *cmdarg; 369 struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify; 370 struct udp_portonly { 371 u_int16_t uh_sport; 372 u_int16_t uh_dport; 373 } *uhp; 374 375 if (sa->sa_family != AF_INET6 || 376 sa->sa_len != sizeof(struct sockaddr_in6)) 377 return; 378 379 if ((unsigned)cmd >= PRC_NCMDS) 380 return; 381 if (PRC_IS_REDIRECT(cmd)) 382 notify = in6_rtchange, d = NULL; 383 else if (cmd == PRC_HOSTDEAD) 384 d = NULL; 385 else if (inet6ctlerrmap[cmd] == 0) 386 return; 387 388 /* if the parameter is from icmp6, decode it. */ 389 if (d != NULL) { 390 ip6cp = (struct ip6ctlparam *)d; 391 m = ip6cp->ip6c_m; 392 ip6 = ip6cp->ip6c_ip6; 393 off = ip6cp->ip6c_off; 394 cmdarg = ip6cp->ip6c_cmdarg; 395 sa6_src = ip6cp->ip6c_src; 396 } else { 397 m = NULL; 398 ip6 = NULL; 399 cmdarg = NULL; 400 sa6_src = &sa6_any; 401 } 402 403 if (ip6) { 404 /* 405 * XXX: We assume that when IPV6 is non NULL, 406 * M and OFF are valid. 407 */ 408 409 /* Check if we can safely examine src and dst ports. */ 410 if (m->m_pkthdr.len < off + sizeof(*uhp)) 411 return; 412 413 bzero(&uh, sizeof(uh)); 414 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 415 416 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport, 417 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 418 cmdarg, notify); 419 } else 420 (void) in6_pcbnotify(&udbinfo, sa, 0, 421 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 422} 423 424static int 425udp6_getcred(SYSCTL_HANDLER_ARGS) 426{ 427 struct xucred xuc; 428 struct sockaddr_in6 addrs[2]; 429 struct inpcb *inp; 430 int error; 431 432 error = priv_check(req->td, PRIV_NETINET_GETCRED); 433 if (error) 434 return (error); 435 436 if (req->newlen != sizeof(addrs)) 437 return (EINVAL); 438 if (req->oldlen != sizeof(struct xucred)) 439 return (EINVAL); 440 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 441 if (error) 442 return (error); 443 if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 || 444 (error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) { 445 return (error); 446 } 447 INP_INFO_RLOCK(&udbinfo); 448 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 449 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1, 450 NULL); 451 if (inp == NULL) { 452 INP_INFO_RUNLOCK(&udbinfo); 453 return (ENOENT); 454 } 455 INP_LOCK(inp); 456 KASSERT(inp->inp_socket != NULL, 457 ("udp6_getcred: inp_socket == NULL")); 458 /* 459 * XXXRW: There should be a scoping access control check here. 460 */ 461 cru2x(inp->inp_socket->so_cred, &xuc); 462 INP_UNLOCK(inp); 463 INP_INFO_RUNLOCK(&udbinfo); 464 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 465 return (error); 466} 467 468SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 469 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 470 471static void 472udp6_abort(struct socket *so) 473{ 474 struct inpcb *inp; 475 476 inp = sotoinpcb(so); 477 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 478 479#ifdef INET 480 if (inp->inp_vflag & INP_IPV4) { 481 struct pr_usrreqs *pru; 482 483 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 484 (*pru->pru_abort)(so); 485 return; 486 } 487#endif 488 489 INP_INFO_WLOCK(&udbinfo); 490 INP_LOCK(inp); 491 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 492 in6_pcbdisconnect(inp); 493 inp->in6p_laddr = in6addr_any; 494 soisdisconnected(so); 495 } 496 INP_UNLOCK(inp); 497 INP_INFO_WUNLOCK(&udbinfo); 498} 499 500static int 501udp6_attach(struct socket *so, int proto, struct thread *td) 502{ 503 struct inpcb *inp; 504 int error; 505 506 inp = sotoinpcb(so); 507 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 508 509 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 510 error = soreserve(so, udp_sendspace, udp_recvspace); 511 if (error) 512 return (error); 513 } 514 INP_INFO_WLOCK(&udbinfo); 515 error = in_pcballoc(so, &udbinfo); 516 if (error) { 517 INP_INFO_WUNLOCK(&udbinfo); 518 return (error); 519 } 520 inp = (struct inpcb *)so->so_pcb; 521 INP_INFO_WUNLOCK(&udbinfo); 522 inp->inp_vflag |= INP_IPV6; 523 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 524 inp->inp_vflag |= INP_IPV4; 525 inp->in6p_hops = -1; /* use kernel default */ 526 inp->in6p_cksum = -1; /* just to be sure */ 527 /* 528 * XXX: ugly!! 529 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 530 * because the socket may be bound to an IPv6 wildcard address, 531 * which may match an IPv4-mapped IPv6 address. 532 */ 533 inp->inp_ip_ttl = ip_defttl; 534 INP_UNLOCK(inp); 535 return (0); 536} 537 538static int 539udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 540{ 541 struct inpcb *inp; 542 int error; 543 544 inp = sotoinpcb(so); 545 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 546 547 INP_INFO_WLOCK(&udbinfo); 548 INP_LOCK(inp); 549 inp->inp_vflag &= ~INP_IPV4; 550 inp->inp_vflag |= INP_IPV6; 551 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 552 struct sockaddr_in6 *sin6_p; 553 554 sin6_p = (struct sockaddr_in6 *)nam; 555 556 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 557 inp->inp_vflag |= INP_IPV4; 558 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 559 struct sockaddr_in sin; 560 561 in6_sin6_2_sin(&sin, sin6_p); 562 inp->inp_vflag |= INP_IPV4; 563 inp->inp_vflag &= ~INP_IPV6; 564 error = in_pcbbind(inp, (struct sockaddr *)&sin, 565 td->td_ucred); 566 goto out; 567 } 568 } 569 570 error = in6_pcbbind(inp, nam, td->td_ucred); 571out: 572 INP_UNLOCK(inp); 573 INP_INFO_WUNLOCK(&udbinfo); 574 return (error); 575} 576 577static void 578udp6_close(struct socket *so) 579{ 580 struct inpcb *inp; 581 582 inp = sotoinpcb(so); 583 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 584 585#ifdef INET 586 if (inp->inp_vflag & INP_IPV4) { 587 struct pr_usrreqs *pru; 588 589 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 590 (*pru->pru_disconnect)(so); 591 return; 592 } 593#endif 594 INP_INFO_WLOCK(&udbinfo); 595 INP_LOCK(inp); 596 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 597 in6_pcbdisconnect(inp); 598 inp->in6p_laddr = in6addr_any; 599 soisdisconnected(so); 600 } 601 INP_UNLOCK(inp); 602 INP_INFO_WUNLOCK(&udbinfo); 603} 604 605static int 606udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 607{ 608 struct inpcb *inp; 609 int error; 610 611 inp = sotoinpcb(so); 612 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 613 614 INP_INFO_WLOCK(&udbinfo); 615 INP_LOCK(inp); 616 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 617 struct sockaddr_in6 *sin6_p; 618 619 sin6_p = (struct sockaddr_in6 *)nam; 620 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 621 struct sockaddr_in sin; 622 623 if (inp->inp_faddr.s_addr != INADDR_ANY) { 624 error = EISCONN; 625 goto out; 626 } 627 in6_sin6_2_sin(&sin, sin6_p); 628 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 629 td->td_ucred); 630 if (error == 0) { 631 inp->inp_vflag |= INP_IPV4; 632 inp->inp_vflag &= ~INP_IPV6; 633 soisconnected(so); 634 } 635 goto out; 636 } 637 } 638 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 639 error = EISCONN; 640 goto out; 641 } 642 error = in6_pcbconnect(inp, nam, td->td_ucred); 643 if (error == 0) { 644 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 645 /* should be non mapped addr */ 646 inp->inp_vflag &= ~INP_IPV4; 647 inp->inp_vflag |= INP_IPV6; 648 } 649 soisconnected(so); 650 } 651out: 652 INP_UNLOCK(inp); 653 INP_INFO_WUNLOCK(&udbinfo); 654 return (error); 655} 656 657static void 658udp6_detach(struct socket *so) 659{ 660 struct inpcb *inp; 661 662 inp = sotoinpcb(so); 663 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 664 665 INP_INFO_WLOCK(&udbinfo); 666 INP_LOCK(inp); 667 in6_pcbdetach(inp); 668 in6_pcbfree(inp); 669 INP_INFO_WUNLOCK(&udbinfo); 670} 671 672static int 673udp6_disconnect(struct socket *so) 674{ 675 struct inpcb *inp; 676 int error; 677 678 inp = sotoinpcb(so); 679 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 680 681 INP_INFO_WLOCK(&udbinfo); 682 INP_LOCK(inp); 683 684#ifdef INET 685 if (inp->inp_vflag & INP_IPV4) { 686 struct pr_usrreqs *pru; 687 688 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 689 error = (*pru->pru_disconnect)(so); 690 goto out; 691 } 692#endif 693 694 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 695 error = ENOTCONN; 696 goto out; 697 } 698 699 in6_pcbdisconnect(inp); 700 inp->in6p_laddr = in6addr_any; 701 /* XXXRW: so_state locking? */ 702 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 703out: 704 INP_UNLOCK(inp); 705 INP_INFO_WUNLOCK(&udbinfo); 706 return (0); 707} 708 709static int 710udp6_send(struct socket *so, int flags, struct mbuf *m, 711 struct sockaddr *addr, struct mbuf *control, struct thread *td) 712{ 713 struct inpcb *inp; 714 int error = 0; 715 716 inp = sotoinpcb(so); 717 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 718 719 INP_INFO_WLOCK(&udbinfo); 720 INP_LOCK(inp); 721 if (addr) { 722 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 723 error = EINVAL; 724 goto bad; 725 } 726 if (addr->sa_family != AF_INET6) { 727 error = EAFNOSUPPORT; 728 goto bad; 729 } 730 } 731 732#ifdef INET 733 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 734 int hasv4addr; 735 struct sockaddr_in6 *sin6 = 0; 736 737 if (addr == 0) 738 hasv4addr = (inp->inp_vflag & INP_IPV4); 739 else { 740 sin6 = (struct sockaddr_in6 *)addr; 741 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 742 ? 1 : 0; 743 } 744 if (hasv4addr) { 745 struct pr_usrreqs *pru; 746 747 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 748 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 749 /* 750 * When remote addr is IPv4-mapped address, 751 * local addr should not be an IPv6 address; 752 * since you cannot determine how to map IPv6 753 * source address to IPv4. 754 */ 755 error = EINVAL; 756 goto out; 757 } 758 if (sin6) 759 in6_sin6_2_sin_in_sock(addr); 760 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 761 error = ((*pru->pru_send)(so, flags, m, addr, control, 762 td)); 763 /* addr will just be freed in sendit(). */ 764 goto out; 765 } 766 } 767#endif 768#ifdef MAC 769 mac_create_mbuf_from_inpcb(inp, m); 770#endif 771 error = udp6_output(inp, m, addr, control, td); 772out: 773 INP_UNLOCK(inp); 774 INP_INFO_WUNLOCK(&udbinfo); 775 return (error); 776 777bad: 778 INP_UNLOCK(inp); 779 INP_INFO_WUNLOCK(&udbinfo); 780 m_freem(m); 781 return (error); 782} 783 784struct pr_usrreqs udp6_usrreqs = { 785 .pru_abort = udp6_abort, 786 .pru_attach = udp6_attach, 787 .pru_bind = udp6_bind, 788 .pru_connect = udp6_connect, 789 .pru_control = in6_control, 790 .pru_detach = udp6_detach, 791 .pru_disconnect = udp6_disconnect, 792 .pru_peeraddr = in6_mapped_peeraddr, 793 .pru_send = udp6_send, 794 .pru_shutdown = udp_shutdown, 795 .pru_sockaddr = in6_mapped_sockaddr, 796 .pru_sosetlabel = in_pcbsosetlabel, 797 .pru_close = udp6_close 798}; 799