udp6_usrreq.c revision 298747
1/*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * Copyright (c) 2010-2011 Juniper Networks, Inc. 4 * Copyright (c) 2014 Kevin Lo 5 * All rights reserved. 6 * 7 * Portions of this software were developed by Robert N. M. Watson under 8 * contract to Juniper Networks, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the project nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ 35 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ 36 */ 37 38/*- 39 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 40 * The Regents of the University of California. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 4. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 68 */ 69 70#include <sys/cdefs.h> 71__FBSDID("$FreeBSD: head/sys/netinet6/udp6_usrreq.c 298747 2016-04-28 15:53:10Z rrs $"); 72 73#include "opt_inet.h" 74#include "opt_inet6.h" 75#include "opt_ipfw.h" 76#include "opt_ipsec.h" 77#include "opt_rss.h" 78 79#include <sys/param.h> 80#include <sys/jail.h> 81#include <sys/kernel.h> 82#include <sys/lock.h> 83#include <sys/mbuf.h> 84#include <sys/priv.h> 85#include <sys/proc.h> 86#include <sys/protosw.h> 87#include <sys/sdt.h> 88#include <sys/signalvar.h> 89#include <sys/socket.h> 90#include <sys/socketvar.h> 91#include <sys/sx.h> 92#include <sys/sysctl.h> 93#include <sys/syslog.h> 94#include <sys/systm.h> 95 96#include <net/if.h> 97#include <net/if_var.h> 98#include <net/if_types.h> 99#include <net/route.h> 100#include <net/rss_config.h> 101 102#include <netinet/in.h> 103#include <netinet/in_kdtrace.h> 104#include <netinet/in_pcb.h> 105#include <netinet/in_systm.h> 106#include <netinet/in_var.h> 107#include <netinet/ip.h> 108#include <netinet/ip_icmp.h> 109#include <netinet/ip6.h> 110#include <netinet/icmp_var.h> 111#include <netinet/icmp6.h> 112#include <netinet/ip_var.h> 113#include <netinet/udp.h> 114#include <netinet/udp_var.h> 115#include <netinet/udplite.h> 116 117#include <netinet6/ip6protosw.h> 118#include <netinet6/ip6_var.h> 119#include <netinet6/in6_pcb.h> 120#include <netinet6/in6_rss.h> 121#include <netinet6/udp6_var.h> 122#include <netinet6/scope6_var.h> 123 124#ifdef IPSEC 125#include <netipsec/ipsec.h> 126#include <netipsec/ipsec6.h> 127#endif /* IPSEC */ 128 129#include <security/mac/mac_framework.h> 130 131/* 132 * UDP protocol implementation. 133 * Per RFC 768, August, 1980. 134 */ 135 136extern struct protosw inetsw[]; 137static void udp6_detach(struct socket *so); 138 139static int 140udp6_append(struct inpcb *inp, struct mbuf *n, int off, 141 struct sockaddr_in6 *fromsa) 142{ 143 struct socket *so; 144 struct mbuf *opts; 145 struct udpcb *up; 146 147 INP_LOCK_ASSERT(inp); 148 149 /* 150 * Engage the tunneling protocol. 151 */ 152 up = intoudpcb(inp); 153 if (up->u_tun_func != NULL) { 154 in_pcbref(inp); 155 INP_RUNLOCK(inp); 156 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa, 157 up->u_tun_ctx); 158 INP_RLOCK(inp); 159 return (in_pcbrele_rlocked(inp)); 160 } 161#ifdef IPSEC 162 /* Check AH/ESP integrity. */ 163 if (ipsec6_in_reject(n, inp)) { 164 m_freem(n); 165 return (0); 166 } 167#endif /* IPSEC */ 168#ifdef MAC 169 if (mac_inpcb_check_deliver(inp, n) != 0) { 170 m_freem(n); 171 return (0); 172 } 173#endif 174 opts = NULL; 175 if (inp->inp_flags & INP_CONTROLOPTS || 176 inp->inp_socket->so_options & SO_TIMESTAMP) 177 ip6_savecontrol(inp, n, &opts); 178 m_adj(n, off + sizeof(struct udphdr)); 179 180 so = inp->inp_socket; 181 SOCKBUF_LOCK(&so->so_rcv); 182 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 183 opts) == 0) { 184 SOCKBUF_UNLOCK(&so->so_rcv); 185 m_freem(n); 186 if (opts) 187 m_freem(opts); 188 UDPSTAT_INC(udps_fullsock); 189 } else 190 sorwakeup_locked(so); 191 return (0); 192} 193 194int 195udp6_input(struct mbuf **mp, int *offp, int proto) 196{ 197 struct mbuf *m = *mp; 198 struct ifnet *ifp; 199 struct ip6_hdr *ip6; 200 struct udphdr *uh; 201 struct inpcb *inp; 202 struct inpcbinfo *pcbinfo; 203 struct udpcb *up; 204 int off = *offp; 205 int cscov_partial; 206 int plen, ulen; 207 struct sockaddr_in6 fromsa; 208 struct m_tag *fwd_tag; 209 uint16_t uh_sum; 210 uint8_t nxt; 211 212 ifp = m->m_pkthdr.rcvif; 213 ip6 = mtod(m, struct ip6_hdr *); 214 215#ifndef PULLDOWN_TEST 216 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 217 ip6 = mtod(m, struct ip6_hdr *); 218 uh = (struct udphdr *)((caddr_t)ip6 + off); 219#else 220 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 221 if (!uh) 222 return (IPPROTO_DONE); 223#endif 224 225 UDPSTAT_INC(udps_ipackets); 226 227 /* 228 * Destination port of 0 is illegal, based on RFC768. 229 */ 230 if (uh->uh_dport == 0) 231 goto badunlocked; 232 233 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 234 ulen = ntohs((u_short)uh->uh_ulen); 235 236 nxt = proto; 237 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 238 if (nxt == IPPROTO_UDPLITE) { 239 /* Zero means checksum over the complete packet. */ 240 if (ulen == 0) 241 ulen = plen; 242 if (ulen == plen) 243 cscov_partial = 0; 244 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 245 /* XXX: What is the right UDPLite MIB counter? */ 246 goto badunlocked; 247 } 248 if (uh->uh_sum == 0) { 249 /* XXX: What is the right UDPLite MIB counter? */ 250 goto badunlocked; 251 } 252 } else { 253 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 254 UDPSTAT_INC(udps_badlen); 255 goto badunlocked; 256 } 257 if (uh->uh_sum == 0) { 258 UDPSTAT_INC(udps_nosum); 259 goto badunlocked; 260 } 261 } 262 263 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 264 !cscov_partial) { 265 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 266 uh_sum = m->m_pkthdr.csum_data; 267 else 268 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 269 m->m_pkthdr.csum_data); 270 uh_sum ^= 0xffff; 271 } else 272 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 273 274 if (uh_sum != 0) { 275 UDPSTAT_INC(udps_badsum); 276 goto badunlocked; 277 } 278 279 /* 280 * Construct sockaddr format source address. 281 */ 282 init_sin6(&fromsa, m); 283 fromsa.sin6_port = uh->uh_sport; 284 285 pcbinfo = udp_get_inpcbinfo(nxt); 286 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 287 struct inpcb *last; 288 struct inpcbhead *pcblist; 289 struct ip6_moptions *imo; 290 291 INP_INFO_RLOCK(pcbinfo); 292 /* 293 * In the event that laddr should be set to the link-local 294 * address (this happens in RIPng), the multicast address 295 * specified in the received packet will not match laddr. To 296 * handle this situation, matching is relaxed if the 297 * receiving interface is the same as one specified in the 298 * socket and if the destination multicast address matches 299 * one of the multicast groups specified in the socket. 300 */ 301 302 /* 303 * KAME note: traditionally we dropped udpiphdr from mbuf 304 * here. We need udphdr for IPsec processing so we do that 305 * later. 306 */ 307 pcblist = udp_get_pcblist(nxt); 308 last = NULL; 309 LIST_FOREACH(inp, pcblist, inp_list) { 310 if ((inp->inp_vflag & INP_IPV6) == 0) 311 continue; 312 if (inp->inp_lport != uh->uh_dport) 313 continue; 314 if (inp->inp_fport != 0 && 315 inp->inp_fport != uh->uh_sport) 316 continue; 317 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 318 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 319 &ip6->ip6_dst)) 320 continue; 321 } 322 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 323 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 324 &ip6->ip6_src) || 325 inp->inp_fport != uh->uh_sport) 326 continue; 327 } 328 329 /* 330 * XXXRW: Because we weren't holding either the inpcb 331 * or the hash lock when we checked for a match 332 * before, we should probably recheck now that the 333 * inpcb lock is (supposed to be) held. 334 */ 335 336 /* 337 * Handle socket delivery policy for any-source 338 * and source-specific multicast. [RFC3678] 339 */ 340 imo = inp->in6p_moptions; 341 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 342 struct sockaddr_in6 mcaddr; 343 int blocked; 344 345 INP_RLOCK(inp); 346 347 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 348 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 349 mcaddr.sin6_family = AF_INET6; 350 mcaddr.sin6_addr = ip6->ip6_dst; 351 352 blocked = im6o_mc_filter(imo, ifp, 353 (struct sockaddr *)&mcaddr, 354 (struct sockaddr *)&fromsa); 355 if (blocked != MCAST_PASS) { 356 if (blocked == MCAST_NOTGMEMBER) 357 IP6STAT_INC(ip6s_notmember); 358 if (blocked == MCAST_NOTSMEMBER || 359 blocked == MCAST_MUTED) 360 UDPSTAT_INC(udps_filtermcast); 361 INP_RUNLOCK(inp); /* XXX */ 362 continue; 363 } 364 365 INP_RUNLOCK(inp); 366 } 367 if (last != NULL) { 368 struct mbuf *n; 369 370 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 371 INP_RLOCK(last); 372 UDP_PROBE(receive, NULL, last, ip6, 373 last, uh); 374 if (udp6_append(last, n, off, &fromsa)) 375 goto inp_lost; 376 INP_RUNLOCK(last); 377 } 378 } 379 last = inp; 380 /* 381 * Don't look for additional matches if this one does 382 * not have either the SO_REUSEPORT or SO_REUSEADDR 383 * socket options set. This heuristic avoids 384 * searching through all pcbs in the common case of a 385 * non-shared port. It assumes that an application 386 * will never clear these options after setting them. 387 */ 388 if ((last->inp_socket->so_options & 389 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 390 break; 391 } 392 393 if (last == NULL) { 394 /* 395 * No matching pcb found; discard datagram. (No need 396 * to send an ICMP Port Unreachable for a broadcast 397 * or multicast datgram.) 398 */ 399 UDPSTAT_INC(udps_noport); 400 UDPSTAT_INC(udps_noportmcast); 401 goto badheadlocked; 402 } 403 INP_RLOCK(last); 404 INP_INFO_RUNLOCK(pcbinfo); 405 UDP_PROBE(receive, NULL, last, ip6, last, uh); 406 if (udp6_append(last, m, off, &fromsa) == 0) 407 INP_RUNLOCK(last); 408 inp_lost: 409 return (IPPROTO_DONE); 410 } 411 /* 412 * Locate pcb for datagram. 413 */ 414 415 /* 416 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 417 */ 418 if ((m->m_flags & M_IP6_NEXTHOP) && 419 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 420 struct sockaddr_in6 *next_hop6; 421 422 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 423 424 /* 425 * Transparently forwarded. Pretend to be the destination. 426 * Already got one like this? 427 */ 428 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 429 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 430 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 431 if (!inp) { 432 /* 433 * It's new. Try to find the ambushing socket. 434 * Because we've rewritten the destination address, 435 * any hardware-generated hash is ignored. 436 */ 437 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 438 uh->uh_sport, &next_hop6->sin6_addr, 439 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 440 uh->uh_dport, INPLOOKUP_WILDCARD | 441 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 442 } 443 /* Remove the tag from the packet. We don't need it anymore. */ 444 m_tag_delete(m, fwd_tag); 445 m->m_flags &= ~M_IP6_NEXTHOP; 446 } else 447 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 448 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 449 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 450 m->m_pkthdr.rcvif, m); 451 if (inp == NULL) { 452 if (udp_log_in_vain) { 453 char ip6bufs[INET6_ADDRSTRLEN]; 454 char ip6bufd[INET6_ADDRSTRLEN]; 455 456 log(LOG_INFO, 457 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 458 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 459 ntohs(uh->uh_dport), 460 ip6_sprintf(ip6bufs, &ip6->ip6_src), 461 ntohs(uh->uh_sport)); 462 } 463 UDPSTAT_INC(udps_noport); 464 if (m->m_flags & M_MCAST) { 465 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 466 UDPSTAT_INC(udps_noportmcast); 467 goto badunlocked; 468 } 469 if (V_udp_blackhole) 470 goto badunlocked; 471 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 472 goto badunlocked; 473 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 474 return (IPPROTO_DONE); 475 } 476 INP_RLOCK_ASSERT(inp); 477 up = intoudpcb(inp); 478 if (cscov_partial) { 479 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 480 INP_RUNLOCK(inp); 481 m_freem(m); 482 return (IPPROTO_DONE); 483 } 484 } 485 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 486 if (udp6_append(inp, m, off, &fromsa) == 0) 487 INP_RUNLOCK(inp); 488 return (IPPROTO_DONE); 489 490badheadlocked: 491 INP_INFO_RUNLOCK(pcbinfo); 492badunlocked: 493 if (m) 494 m_freem(m); 495 return (IPPROTO_DONE); 496} 497 498static void 499udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 500 struct inpcbinfo *pcbinfo) 501{ 502 struct udphdr uh; 503 struct ip6_hdr *ip6; 504 struct mbuf *m; 505 int off = 0; 506 struct ip6ctlparam *ip6cp = NULL; 507 const struct sockaddr_in6 *sa6_src = NULL; 508 void *cmdarg; 509 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 510 struct udp_portonly { 511 u_int16_t uh_sport; 512 u_int16_t uh_dport; 513 } *uhp; 514 515 if (sa->sa_family != AF_INET6 || 516 sa->sa_len != sizeof(struct sockaddr_in6)) 517 return; 518 519 if ((unsigned)cmd >= PRC_NCMDS) 520 return; 521 if (PRC_IS_REDIRECT(cmd)) 522 notify = in6_rtchange, d = NULL; 523 else if (cmd == PRC_HOSTDEAD) 524 d = NULL; 525 else if (inet6ctlerrmap[cmd] == 0) 526 return; 527 528 /* if the parameter is from icmp6, decode it. */ 529 if (d != NULL) { 530 ip6cp = (struct ip6ctlparam *)d; 531 m = ip6cp->ip6c_m; 532 ip6 = ip6cp->ip6c_ip6; 533 off = ip6cp->ip6c_off; 534 cmdarg = ip6cp->ip6c_cmdarg; 535 sa6_src = ip6cp->ip6c_src; 536 } else { 537 m = NULL; 538 ip6 = NULL; 539 cmdarg = NULL; 540 sa6_src = &sa6_any; 541 } 542 543 if (ip6) { 544 /* 545 * XXX: We assume that when IPV6 is non NULL, 546 * M and OFF are valid. 547 */ 548 549 /* Check if we can safely examine src and dst ports. */ 550 if (m->m_pkthdr.len < off + sizeof(*uhp)) 551 return; 552 553 bzero(&uh, sizeof(uh)); 554 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 555 556 if (!PRC_IS_REDIRECT(cmd)) { 557 /* Check to see if its tunneled */ 558 struct inpcb *inp; 559 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 560 uh.uh_sport, &ip6->ip6_dst, uh.uh_dport, 561 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 562 m->m_pkthdr.rcvif, m); 563 if (inp != NULL) { 564 struct udpcb *up; 565 566 up = intoudpcb(inp); 567 if (up->u_icmp_func) { 568 /* Yes it is. */ 569 INP_RUNLOCK(inp); 570 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 571 d, up->u_tun_ctx); 572 return; 573 } else { 574 /* Can't find it. */ 575 INP_RUNLOCK(inp); 576 } 577 } 578 } 579 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 580 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 581 cmdarg, notify); 582 } else 583 (void)in6_pcbnotify(pcbinfo, sa, 0, 584 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 585} 586 587void 588udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 589{ 590 591 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 592} 593 594void 595udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 596{ 597 598 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 599} 600 601static int 602udp6_getcred(SYSCTL_HANDLER_ARGS) 603{ 604 struct xucred xuc; 605 struct sockaddr_in6 addrs[2]; 606 struct inpcb *inp; 607 int error; 608 609 error = priv_check(req->td, PRIV_NETINET_GETCRED); 610 if (error) 611 return (error); 612 613 if (req->newlen != sizeof(addrs)) 614 return (EINVAL); 615 if (req->oldlen != sizeof(struct xucred)) 616 return (EINVAL); 617 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 618 if (error) 619 return (error); 620 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 621 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 622 return (error); 623 } 624 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 625 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 626 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 627 if (inp != NULL) { 628 INP_RLOCK_ASSERT(inp); 629 if (inp->inp_socket == NULL) 630 error = ENOENT; 631 if (error == 0) 632 error = cr_canseesocket(req->td->td_ucred, 633 inp->inp_socket); 634 if (error == 0) 635 cru2x(inp->inp_cred, &xuc); 636 INP_RUNLOCK(inp); 637 } else 638 error = ENOENT; 639 if (error == 0) 640 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 641 return (error); 642} 643 644SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 645 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 646 647static int 648udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 649 struct mbuf *control, struct thread *td) 650{ 651 u_int32_t ulen = m->m_pkthdr.len; 652 u_int32_t plen = sizeof(struct udphdr) + ulen; 653 struct ip6_hdr *ip6; 654 struct udphdr *udp6; 655 struct in6_addr *laddr, *faddr, in6a; 656 struct sockaddr_in6 *sin6 = NULL; 657 int cscov_partial = 0; 658 int scope_ambiguous = 0; 659 u_short fport; 660 int error = 0; 661 uint8_t nxt; 662 uint16_t cscov = 0; 663 struct ip6_pktopts *optp, opt; 664 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 665 int flags; 666 struct sockaddr_in6 tmp; 667 668 INP_WLOCK_ASSERT(inp); 669 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 670 671 if (addr6) { 672 /* addr6 has been validated in udp6_send(). */ 673 sin6 = (struct sockaddr_in6 *)addr6; 674 675 /* protect *sin6 from overwrites */ 676 tmp = *sin6; 677 sin6 = &tmp; 678 679 /* 680 * Application should provide a proper zone ID or the use of 681 * default zone IDs should be enabled. Unfortunately, some 682 * applications do not behave as it should, so we need a 683 * workaround. Even if an appropriate ID is not determined, 684 * we'll see if we can determine the outgoing interface. If we 685 * can, determine the zone ID based on the interface below. 686 */ 687 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 688 scope_ambiguous = 1; 689 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 690 return (error); 691 } 692 693 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 694 IPPROTO_UDP : IPPROTO_UDPLITE; 695 if (control) { 696 if ((error = ip6_setpktopts(control, &opt, 697 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) 698 goto release; 699 optp = &opt; 700 } else 701 optp = inp->in6p_outputopts; 702 703 if (sin6) { 704 faddr = &sin6->sin6_addr; 705 706 /* 707 * Since we saw no essential reason for calling in_pcbconnect, 708 * we get rid of such kind of logic, and call in6_selectsrc 709 * and in6_pcbsetport in order to fill in the local address 710 * and the local port. 711 */ 712 if (sin6->sin6_port == 0) { 713 error = EADDRNOTAVAIL; 714 goto release; 715 } 716 717 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 718 /* how about ::ffff:0.0.0.0 case? */ 719 error = EISCONN; 720 goto release; 721 } 722 723 fport = sin6->sin6_port; /* allow 0 port */ 724 725 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 726 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 727 /* 728 * I believe we should explicitly discard the 729 * packet when mapped addresses are disabled, 730 * rather than send the packet as an IPv6 one. 731 * If we chose the latter approach, the packet 732 * might be sent out on the wire based on the 733 * default route, the situation which we'd 734 * probably want to avoid. 735 * (20010421 jinmei@kame.net) 736 */ 737 error = EINVAL; 738 goto release; 739 } 740 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 741 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 742 /* 743 * when remote addr is an IPv4-mapped address, 744 * local addr should not be an IPv6 address, 745 * since you cannot determine how to map IPv6 746 * source address to IPv4. 747 */ 748 error = EINVAL; 749 goto release; 750 } 751 752 af = AF_INET; 753 } 754 755 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 756 error = in6_selectsrc_socket(sin6, optp, inp, 757 td->td_ucred, scope_ambiguous, &in6a, NULL); 758 if (error) 759 goto release; 760 laddr = &in6a; 761 } else 762 laddr = &inp->in6p_laddr; /* XXX */ 763 if (laddr == NULL) { 764 if (error == 0) 765 error = EADDRNOTAVAIL; 766 goto release; 767 } 768 if (inp->inp_lport == 0 && 769 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 770 /* Undo an address bind that may have occurred. */ 771 inp->in6p_laddr = in6addr_any; 772 goto release; 773 } 774 } else { 775 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 776 error = ENOTCONN; 777 goto release; 778 } 779 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 780 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 781 /* 782 * XXX: this case would happen when the 783 * application sets the V6ONLY flag after 784 * connecting the foreign address. 785 * Such applications should be fixed, 786 * so we bark here. 787 */ 788 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 789 "option was set for a connected socket\n"); 790 error = EINVAL; 791 goto release; 792 } else 793 af = AF_INET; 794 } 795 laddr = &inp->in6p_laddr; 796 faddr = &inp->in6p_faddr; 797 fport = inp->inp_fport; 798 } 799 800 if (af == AF_INET) 801 hlen = sizeof(struct ip); 802 803 /* 804 * Calculate data length and get a mbuf 805 * for UDP and IP6 headers. 806 */ 807 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 808 if (m == NULL) { 809 error = ENOBUFS; 810 goto release; 811 } 812 813 /* 814 * Stuff checksum and output datagram. 815 */ 816 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 817 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 818 udp6->uh_dport = fport; 819 if (nxt == IPPROTO_UDPLITE) { 820 struct udpcb *up; 821 822 up = intoudpcb(inp); 823 cscov = up->u_txcslen; 824 if (cscov >= plen) 825 cscov = 0; 826 udp6->uh_ulen = htons(cscov); 827 /* 828 * For UDP-Lite, checksum coverage length of zero means 829 * the entire UDPLite packet is covered by the checksum. 830 */ 831 cscov_partial = (cscov == 0) ? 0 : 1; 832 } else if (plen <= 0xffff) 833 udp6->uh_ulen = htons((u_short)plen); 834 else 835 udp6->uh_ulen = 0; 836 udp6->uh_sum = 0; 837 838 switch (af) { 839 case AF_INET6: 840 ip6 = mtod(m, struct ip6_hdr *); 841 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 842 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 843 ip6->ip6_vfc |= IPV6_VERSION; 844 ip6->ip6_plen = htons((u_short)plen); 845 ip6->ip6_nxt = nxt; 846 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 847 ip6->ip6_src = *laddr; 848 ip6->ip6_dst = *faddr; 849 850 if (cscov_partial) { 851 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 852 sizeof(struct ip6_hdr), plen, cscov)) == 0) 853 udp6->uh_sum = 0xffff; 854 } else { 855 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 856 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 857 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 858 } 859 860#ifdef RSS 861 { 862 uint32_t hash_val, hash_type; 863 uint8_t pr; 864 865 pr = inp->inp_socket->so_proto->pr_protocol; 866 /* 867 * Calculate an appropriate RSS hash for UDP and 868 * UDP Lite. 869 * 870 * The called function will take care of figuring out 871 * whether a 2-tuple or 4-tuple hash is required based 872 * on the currently configured scheme. 873 * 874 * Later later on connected socket values should be 875 * cached in the inpcb and reused, rather than constantly 876 * re-calculating it. 877 * 878 * UDP Lite is a different protocol number and will 879 * likely end up being hashed as a 2-tuple until 880 * RSS / NICs grow UDP Lite protocol awareness. 881 */ 882 if (rss_proto_software_hash_v6(faddr, laddr, fport, 883 inp->inp_lport, pr, &hash_val, &hash_type) == 0) { 884 m->m_pkthdr.flowid = hash_val; 885 M_HASHTYPE_SET(m, hash_type); 886 } 887 } 888#endif 889 flags = 0; 890#ifdef RSS 891 /* 892 * Don't override with the inp cached flowid. 893 * 894 * Until the whole UDP path is vetted, it may actually 895 * be incorrect. 896 */ 897 flags |= IP_NODEFAULTFLOWID; 898#endif 899 900 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 901 UDPSTAT_INC(udps_opackets); 902 error = ip6_output(m, optp, &inp->inp_route6, flags, 903 inp->in6p_moptions, NULL, inp); 904 break; 905 case AF_INET: 906 error = EAFNOSUPPORT; 907 goto release; 908 } 909 goto releaseopt; 910 911release: 912 m_freem(m); 913 914releaseopt: 915 if (control) { 916 ip6_clearpktopts(&opt, -1); 917 m_freem(control); 918 } 919 return (error); 920} 921 922static void 923udp6_abort(struct socket *so) 924{ 925 struct inpcb *inp; 926 struct inpcbinfo *pcbinfo; 927 928 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 929 inp = sotoinpcb(so); 930 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 931 932 INP_WLOCK(inp); 933#ifdef INET 934 if (inp->inp_vflag & INP_IPV4) { 935 struct pr_usrreqs *pru; 936 uint8_t nxt; 937 938 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 939 IPPROTO_UDP : IPPROTO_UDPLITE; 940 INP_WUNLOCK(inp); 941 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 942 (*pru->pru_abort)(so); 943 return; 944 } 945#endif 946 947 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 948 INP_HASH_WLOCK(pcbinfo); 949 in6_pcbdisconnect(inp); 950 inp->in6p_laddr = in6addr_any; 951 INP_HASH_WUNLOCK(pcbinfo); 952 soisdisconnected(so); 953 } 954 INP_WUNLOCK(inp); 955} 956 957static int 958udp6_attach(struct socket *so, int proto, struct thread *td) 959{ 960 struct inpcb *inp; 961 struct inpcbinfo *pcbinfo; 962 int error; 963 964 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 965 inp = sotoinpcb(so); 966 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 967 968 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 969 error = soreserve(so, udp_sendspace, udp_recvspace); 970 if (error) 971 return (error); 972 } 973 INP_INFO_WLOCK(pcbinfo); 974 error = in_pcballoc(so, pcbinfo); 975 if (error) { 976 INP_INFO_WUNLOCK(pcbinfo); 977 return (error); 978 } 979 inp = (struct inpcb *)so->so_pcb; 980 inp->inp_vflag |= INP_IPV6; 981 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 982 inp->inp_vflag |= INP_IPV4; 983 inp->in6p_hops = -1; /* use kernel default */ 984 inp->in6p_cksum = -1; /* just to be sure */ 985 /* 986 * XXX: ugly!! 987 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 988 * because the socket may be bound to an IPv6 wildcard address, 989 * which may match an IPv4-mapped IPv6 address. 990 */ 991 inp->inp_ip_ttl = V_ip_defttl; 992 993 error = udp_newudpcb(inp); 994 if (error) { 995 in_pcbdetach(inp); 996 in_pcbfree(inp); 997 INP_INFO_WUNLOCK(pcbinfo); 998 return (error); 999 } 1000 INP_WUNLOCK(inp); 1001 INP_INFO_WUNLOCK(pcbinfo); 1002 return (0); 1003} 1004 1005static int 1006udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1007{ 1008 struct inpcb *inp; 1009 struct inpcbinfo *pcbinfo; 1010 int error; 1011 1012 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1013 inp = sotoinpcb(so); 1014 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1015 1016 INP_WLOCK(inp); 1017 INP_HASH_WLOCK(pcbinfo); 1018 inp->inp_vflag &= ~INP_IPV4; 1019 inp->inp_vflag |= INP_IPV6; 1020 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1021 struct sockaddr_in6 *sin6_p; 1022 1023 sin6_p = (struct sockaddr_in6 *)nam; 1024 1025 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1026 inp->inp_vflag |= INP_IPV4; 1027#ifdef INET 1028 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1029 struct sockaddr_in sin; 1030 1031 in6_sin6_2_sin(&sin, sin6_p); 1032 inp->inp_vflag |= INP_IPV4; 1033 inp->inp_vflag &= ~INP_IPV6; 1034 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1035 td->td_ucred); 1036 goto out; 1037 } 1038#endif 1039 } 1040 1041 error = in6_pcbbind(inp, nam, td->td_ucred); 1042#ifdef INET 1043out: 1044#endif 1045 INP_HASH_WUNLOCK(pcbinfo); 1046 INP_WUNLOCK(inp); 1047 return (error); 1048} 1049 1050static void 1051udp6_close(struct socket *so) 1052{ 1053 struct inpcb *inp; 1054 struct inpcbinfo *pcbinfo; 1055 1056 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1057 inp = sotoinpcb(so); 1058 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1059 1060 INP_WLOCK(inp); 1061#ifdef INET 1062 if (inp->inp_vflag & INP_IPV4) { 1063 struct pr_usrreqs *pru; 1064 uint8_t nxt; 1065 1066 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1067 IPPROTO_UDP : IPPROTO_UDPLITE; 1068 INP_WUNLOCK(inp); 1069 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1070 (*pru->pru_disconnect)(so); 1071 return; 1072 } 1073#endif 1074 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1075 INP_HASH_WLOCK(pcbinfo); 1076 in6_pcbdisconnect(inp); 1077 inp->in6p_laddr = in6addr_any; 1078 INP_HASH_WUNLOCK(pcbinfo); 1079 soisdisconnected(so); 1080 } 1081 INP_WUNLOCK(inp); 1082} 1083 1084static int 1085udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1086{ 1087 struct inpcb *inp; 1088 struct inpcbinfo *pcbinfo; 1089 struct sockaddr_in6 *sin6; 1090 int error; 1091 1092 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1093 inp = sotoinpcb(so); 1094 sin6 = (struct sockaddr_in6 *)nam; 1095 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1096 1097 /* 1098 * XXXRW: Need to clarify locking of v4/v6 flags. 1099 */ 1100 INP_WLOCK(inp); 1101#ifdef INET 1102 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1103 struct sockaddr_in sin; 1104 1105 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1106 error = EINVAL; 1107 goto out; 1108 } 1109 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1110 error = EISCONN; 1111 goto out; 1112 } 1113 in6_sin6_2_sin(&sin, sin6); 1114 inp->inp_vflag |= INP_IPV4; 1115 inp->inp_vflag &= ~INP_IPV6; 1116 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1117 if (error != 0) 1118 goto out; 1119 INP_HASH_WLOCK(pcbinfo); 1120 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1121 td->td_ucred); 1122 INP_HASH_WUNLOCK(pcbinfo); 1123 if (error == 0) 1124 soisconnected(so); 1125 goto out; 1126 } 1127#endif 1128 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1129 error = EISCONN; 1130 goto out; 1131 } 1132 inp->inp_vflag &= ~INP_IPV4; 1133 inp->inp_vflag |= INP_IPV6; 1134 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1135 if (error != 0) 1136 goto out; 1137 INP_HASH_WLOCK(pcbinfo); 1138 error = in6_pcbconnect(inp, nam, td->td_ucred); 1139 INP_HASH_WUNLOCK(pcbinfo); 1140 if (error == 0) 1141 soisconnected(so); 1142out: 1143 INP_WUNLOCK(inp); 1144 return (error); 1145} 1146 1147static void 1148udp6_detach(struct socket *so) 1149{ 1150 struct inpcb *inp; 1151 struct inpcbinfo *pcbinfo; 1152 struct udpcb *up; 1153 1154 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1155 inp = sotoinpcb(so); 1156 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1157 1158 INP_INFO_WLOCK(pcbinfo); 1159 INP_WLOCK(inp); 1160 up = intoudpcb(inp); 1161 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1162 in_pcbdetach(inp); 1163 in_pcbfree(inp); 1164 INP_INFO_WUNLOCK(pcbinfo); 1165 udp_discardcb(up); 1166} 1167 1168static int 1169udp6_disconnect(struct socket *so) 1170{ 1171 struct inpcb *inp; 1172 struct inpcbinfo *pcbinfo; 1173 int error; 1174 1175 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1176 inp = sotoinpcb(so); 1177 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1178 1179 INP_WLOCK(inp); 1180#ifdef INET 1181 if (inp->inp_vflag & INP_IPV4) { 1182 struct pr_usrreqs *pru; 1183 uint8_t nxt; 1184 1185 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1186 IPPROTO_UDP : IPPROTO_UDPLITE; 1187 INP_WUNLOCK(inp); 1188 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1189 (void)(*pru->pru_disconnect)(so); 1190 return (0); 1191 } 1192#endif 1193 1194 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1195 error = ENOTCONN; 1196 goto out; 1197 } 1198 1199 INP_HASH_WLOCK(pcbinfo); 1200 in6_pcbdisconnect(inp); 1201 inp->in6p_laddr = in6addr_any; 1202 INP_HASH_WUNLOCK(pcbinfo); 1203 SOCK_LOCK(so); 1204 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1205 SOCK_UNLOCK(so); 1206out: 1207 INP_WUNLOCK(inp); 1208 return (0); 1209} 1210 1211static int 1212udp6_send(struct socket *so, int flags, struct mbuf *m, 1213 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1214{ 1215 struct inpcb *inp; 1216 struct inpcbinfo *pcbinfo; 1217 int error = 0; 1218 1219 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1220 inp = sotoinpcb(so); 1221 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1222 1223 INP_WLOCK(inp); 1224 if (addr) { 1225 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1226 error = EINVAL; 1227 goto bad; 1228 } 1229 if (addr->sa_family != AF_INET6) { 1230 error = EAFNOSUPPORT; 1231 goto bad; 1232 } 1233 } 1234 1235#ifdef INET 1236 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1237 int hasv4addr; 1238 struct sockaddr_in6 *sin6 = NULL; 1239 1240 if (addr == NULL) 1241 hasv4addr = (inp->inp_vflag & INP_IPV4); 1242 else { 1243 sin6 = (struct sockaddr_in6 *)addr; 1244 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1245 ? 1 : 0; 1246 } 1247 if (hasv4addr) { 1248 struct pr_usrreqs *pru; 1249 uint8_t nxt; 1250 1251 nxt = (inp->inp_socket->so_proto->pr_protocol == 1252 IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE; 1253 /* 1254 * XXXRW: We release UDP-layer locks before calling 1255 * udp_send() in order to avoid recursion. However, 1256 * this does mean there is a short window where inp's 1257 * fields are unstable. Could this lead to a 1258 * potential race in which the factors causing us to 1259 * select the UDPv4 output routine are invalidated? 1260 */ 1261 INP_WUNLOCK(inp); 1262 if (sin6) 1263 in6_sin6_2_sin_in_sock(addr); 1264 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1265 /* addr will just be freed in sendit(). */ 1266 return ((*pru->pru_send)(so, flags, m, addr, control, 1267 td)); 1268 } 1269 } 1270#endif 1271#ifdef MAC 1272 mac_inpcb_create_mbuf(inp, m); 1273#endif 1274 INP_HASH_WLOCK(pcbinfo); 1275 error = udp6_output(inp, m, addr, control, td); 1276 INP_HASH_WUNLOCK(pcbinfo); 1277 INP_WUNLOCK(inp); 1278 return (error); 1279 1280bad: 1281 INP_WUNLOCK(inp); 1282 m_freem(m); 1283 return (error); 1284} 1285 1286struct pr_usrreqs udp6_usrreqs = { 1287 .pru_abort = udp6_abort, 1288 .pru_attach = udp6_attach, 1289 .pru_bind = udp6_bind, 1290 .pru_connect = udp6_connect, 1291 .pru_control = in6_control, 1292 .pru_detach = udp6_detach, 1293 .pru_disconnect = udp6_disconnect, 1294 .pru_peeraddr = in6_mapped_peeraddr, 1295 .pru_send = udp6_send, 1296 .pru_shutdown = udp_shutdown, 1297 .pru_sockaddr = in6_mapped_sockaddr, 1298 .pru_soreceive = soreceive_dgram, 1299 .pru_sosend = sosend_dgram, 1300 .pru_sosetlabel = in_pcbsosetlabel, 1301 .pru_close = udp6_close 1302}; 1303