udp6_usrreq.c revision 272404
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 272404 2014-10-02 10:32:24Z tuexen $"); 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> 100 101#include <netinet/in.h> 102#include <netinet/in_kdtrace.h> 103#include <netinet/in_pcb.h> 104#include <netinet/in_systm.h> 105#include <netinet/in_var.h> 106#include <netinet/ip.h> 107#include <netinet/ip_icmp.h> 108#include <netinet/ip6.h> 109#include <netinet/icmp_var.h> 110#include <netinet/icmp6.h> 111#include <netinet/ip_var.h> 112#include <netinet/udp.h> 113#include <netinet/udp_var.h> 114#include <netinet/udplite.h> 115#include <netinet/in_rss.h> 116 117#include <netinet6/ip6protosw.h> 118#include <netinet6/ip6_var.h> 119#include <netinet6/in6_pcb.h> 120#include <netinet6/udp6_var.h> 121#include <netinet6/scope6_var.h> 122 123#ifdef IPSEC 124#include <netipsec/ipsec.h> 125#include <netipsec/ipsec6.h> 126#endif /* IPSEC */ 127 128#include <security/mac/mac_framework.h> 129 130/* 131 * UDP protocol implementation. 132 * Per RFC 768, August, 1980. 133 */ 134 135extern struct protosw inetsw[]; 136static void udp6_detach(struct socket *so); 137 138static void 139udp6_append(struct inpcb *inp, struct mbuf *n, int off, 140 struct sockaddr_in6 *fromsa) 141{ 142 struct socket *so; 143 struct mbuf *opts; 144 145 INP_LOCK_ASSERT(inp); 146 147#ifdef IPSEC 148 /* Check AH/ESP integrity. */ 149 if (ipsec6_in_reject(n, inp)) { 150 m_freem(n); 151 IPSEC6STAT_INC(ips_in_polvio); 152 return; 153 } 154#endif /* IPSEC */ 155#ifdef MAC 156 if (mac_inpcb_check_deliver(inp, n) != 0) { 157 m_freem(n); 158 return; 159 } 160#endif 161 opts = NULL; 162 if (inp->inp_flags & INP_CONTROLOPTS || 163 inp->inp_socket->so_options & SO_TIMESTAMP) 164 ip6_savecontrol(inp, n, &opts); 165 m_adj(n, off + sizeof(struct udphdr)); 166 167 so = inp->inp_socket; 168 SOCKBUF_LOCK(&so->so_rcv); 169 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 170 opts) == 0) { 171 SOCKBUF_UNLOCK(&so->so_rcv); 172 m_freem(n); 173 if (opts) 174 m_freem(opts); 175 UDPSTAT_INC(udps_fullsock); 176 } else 177 sorwakeup_locked(so); 178} 179 180int 181udp6_input(struct mbuf **mp, int *offp, int proto) 182{ 183 struct mbuf *m = *mp; 184 struct ifnet *ifp; 185 struct ip6_hdr *ip6; 186 struct udphdr *uh; 187 struct inpcb *inp; 188 struct inpcbinfo *pcbinfo; 189 struct udpcb *up; 190 int off = *offp; 191 int cscov_partial; 192 int plen, ulen; 193 struct sockaddr_in6 fromsa; 194 struct m_tag *fwd_tag; 195 uint16_t uh_sum; 196 uint8_t nxt; 197 198 ifp = m->m_pkthdr.rcvif; 199 ip6 = mtod(m, struct ip6_hdr *); 200 201 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 202 /* XXX send icmp6 host/port unreach? */ 203 m_freem(m); 204 return (IPPROTO_DONE); 205 } 206 207#ifndef PULLDOWN_TEST 208 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 209 ip6 = mtod(m, struct ip6_hdr *); 210 uh = (struct udphdr *)((caddr_t)ip6 + off); 211#else 212 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 213 if (!uh) 214 return (IPPROTO_DONE); 215#endif 216 217 UDPSTAT_INC(udps_ipackets); 218 219 /* 220 * Destination port of 0 is illegal, based on RFC768. 221 */ 222 if (uh->uh_dport == 0) 223 goto badunlocked; 224 225 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 226 ulen = ntohs((u_short)uh->uh_ulen); 227 228 nxt = ip6->ip6_nxt; 229 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 230 if (nxt == IPPROTO_UDPLITE) { 231 /* Zero means checksum over the complete packet. */ 232 if (ulen == 0) 233 ulen = plen; 234 if (ulen == plen) 235 cscov_partial = 0; 236 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 237 /* XXX: What is the right UDPLite MIB counter? */ 238 goto badunlocked; 239 } 240 } 241 if (nxt == IPPROTO_UDP && plen != ulen) { 242 UDPSTAT_INC(udps_badlen); 243 goto badunlocked; 244 } 245 246 /* 247 * Checksum extended UDP header and data. 248 */ 249 if (uh->uh_sum == 0) { 250 if (ulen > plen || ulen < sizeof(struct udphdr)) { 251 UDPSTAT_INC(udps_nosum); 252 goto badunlocked; 253 } 254 } 255 256 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 257 !cscov_partial) { 258 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 259 uh_sum = m->m_pkthdr.csum_data; 260 else 261 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 262 m->m_pkthdr.csum_data); 263 uh_sum ^= 0xffff; 264 } else 265 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 266 267 if (uh_sum != 0) { 268 UDPSTAT_INC(udps_badsum); 269 /*goto badunlocked;*/ 270 } 271 272 /* 273 * Construct sockaddr format source address. 274 */ 275 init_sin6(&fromsa, m); 276 fromsa.sin6_port = uh->uh_sport; 277 278 pcbinfo = get_inpcbinfo(nxt); 279 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 280 struct inpcb *last; 281 struct inpcbhead *pcblist; 282 struct ip6_moptions *imo; 283 284 INP_INFO_RLOCK(pcbinfo); 285 /* 286 * In the event that laddr should be set to the link-local 287 * address (this happens in RIPng), the multicast address 288 * specified in the received packet will not match laddr. To 289 * handle this situation, matching is relaxed if the 290 * receiving interface is the same as one specified in the 291 * socket and if the destination multicast address matches 292 * one of the multicast groups specified in the socket. 293 */ 294 295 /* 296 * KAME note: traditionally we dropped udpiphdr from mbuf 297 * here. We need udphdr for IPsec processing so we do that 298 * later. 299 */ 300 pcblist = get_pcblist(nxt); 301 last = NULL; 302 LIST_FOREACH(inp, pcblist, inp_list) { 303 if ((inp->inp_vflag & INP_IPV6) == 0) 304 continue; 305 if (inp->inp_lport != uh->uh_dport) 306 continue; 307 if (inp->inp_fport != 0 && 308 inp->inp_fport != uh->uh_sport) 309 continue; 310 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 311 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 312 &ip6->ip6_dst)) 313 continue; 314 } 315 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 316 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 317 &ip6->ip6_src) || 318 inp->inp_fport != uh->uh_sport) 319 continue; 320 } 321 322 /* 323 * XXXRW: Because we weren't holding either the inpcb 324 * or the hash lock when we checked for a match 325 * before, we should probably recheck now that the 326 * inpcb lock is (supposed to be) held. 327 */ 328 329 /* 330 * Handle socket delivery policy for any-source 331 * and source-specific multicast. [RFC3678] 332 */ 333 imo = inp->in6p_moptions; 334 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 335 struct sockaddr_in6 mcaddr; 336 int blocked; 337 338 INP_RLOCK(inp); 339 340 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 341 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 342 mcaddr.sin6_family = AF_INET6; 343 mcaddr.sin6_addr = ip6->ip6_dst; 344 345 blocked = im6o_mc_filter(imo, ifp, 346 (struct sockaddr *)&mcaddr, 347 (struct sockaddr *)&fromsa); 348 if (blocked != MCAST_PASS) { 349 if (blocked == MCAST_NOTGMEMBER) 350 IP6STAT_INC(ip6s_notmember); 351 if (blocked == MCAST_NOTSMEMBER || 352 blocked == MCAST_MUTED) 353 UDPSTAT_INC(udps_filtermcast); 354 INP_RUNLOCK(inp); /* XXX */ 355 continue; 356 } 357 358 INP_RUNLOCK(inp); 359 } 360 if (last != NULL) { 361 struct mbuf *n; 362 363 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 364 INP_RLOCK(last); 365 up = intoudpcb(last); 366 if (up->u_tun_func == NULL) { 367 udp6_append(last, n, off, &fromsa); 368 } else { 369 /* 370 * Engage the tunneling 371 * protocol we will have to 372 * leave the info_lock up, 373 * since we are hunting 374 * through multiple UDP's. 375 * 376 */ 377 (*up->u_tun_func)(n, off, last); 378 } 379 INP_RUNLOCK(last); 380 } 381 } 382 last = inp; 383 /* 384 * Don't look for additional matches if this one does 385 * not have either the SO_REUSEPORT or SO_REUSEADDR 386 * socket options set. This heuristic avoids 387 * searching through all pcbs in the common case of a 388 * non-shared port. It assumes that an application 389 * will never clear these options after setting them. 390 */ 391 if ((last->inp_socket->so_options & 392 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 393 break; 394 } 395 396 if (last == NULL) { 397 /* 398 * No matching pcb found; discard datagram. (No need 399 * to send an ICMP Port Unreachable for a broadcast 400 * or multicast datgram.) 401 */ 402 UDPSTAT_INC(udps_noport); 403 UDPSTAT_INC(udps_noportmcast); 404 goto badheadlocked; 405 } 406 INP_RLOCK(last); 407 INP_INFO_RUNLOCK(pcbinfo); 408 up = intoudpcb(last); 409 UDP_PROBE(receive, NULL, last, ip6, last, uh); 410 if (up->u_tun_func == NULL) { 411 udp6_append(last, m, off, &fromsa); 412 } else { 413 /* 414 * Engage the tunneling protocol. 415 */ 416 (*up->u_tun_func)(m, off, last); 417 } 418 INP_RUNLOCK(last); 419 return (IPPROTO_DONE); 420 } 421 /* 422 * Locate pcb for datagram. 423 */ 424 425 /* 426 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 427 */ 428 if ((m->m_flags & M_IP6_NEXTHOP) && 429 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 430 struct sockaddr_in6 *next_hop6; 431 432 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 433 434 /* 435 * Transparently forwarded. Pretend to be the destination. 436 * Already got one like this? 437 */ 438 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 439 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 440 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 441 if (!inp) { 442 /* 443 * It's new. Try to find the ambushing socket. 444 * Because we've rewritten the destination address, 445 * any hardware-generated hash is ignored. 446 */ 447 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 448 uh->uh_sport, &next_hop6->sin6_addr, 449 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 450 uh->uh_dport, INPLOOKUP_WILDCARD | 451 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 452 } 453 /* Remove the tag from the packet. We don't need it anymore. */ 454 m_tag_delete(m, fwd_tag); 455 m->m_flags &= ~M_IP6_NEXTHOP; 456 } else 457 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 458 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 459 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 460 m->m_pkthdr.rcvif, m); 461 if (inp == NULL) { 462 if (udp_log_in_vain) { 463 char ip6bufs[INET6_ADDRSTRLEN]; 464 char ip6bufd[INET6_ADDRSTRLEN]; 465 466 log(LOG_INFO, 467 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 468 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 469 ntohs(uh->uh_dport), 470 ip6_sprintf(ip6bufs, &ip6->ip6_src), 471 ntohs(uh->uh_sport)); 472 } 473 UDPSTAT_INC(udps_noport); 474 if (m->m_flags & M_MCAST) { 475 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 476 UDPSTAT_INC(udps_noportmcast); 477 goto badunlocked; 478 } 479 if (V_udp_blackhole) 480 goto badunlocked; 481 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 482 goto badunlocked; 483 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 484 return (IPPROTO_DONE); 485 } 486 INP_RLOCK_ASSERT(inp); 487 up = intoudpcb(inp); 488 if (cscov_partial) { 489 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 490 INP_RUNLOCK(inp); 491 m_freem(m); 492 return (IPPROTO_DONE); 493 } 494 } 495 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 496 if (up->u_tun_func == NULL) { 497 udp6_append(inp, m, off, &fromsa); 498 } else { 499 /* 500 * Engage the tunneling protocol. 501 */ 502 503 (*up->u_tun_func)(m, off, inp); 504 } 505 INP_RUNLOCK(inp); 506 return (IPPROTO_DONE); 507 508badheadlocked: 509 INP_INFO_RUNLOCK(pcbinfo); 510badunlocked: 511 if (m) 512 m_freem(m); 513 return (IPPROTO_DONE); 514} 515 516static void 517udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 518 struct inpcbinfo *pcbinfo) 519{ 520 struct udphdr uh; 521 struct ip6_hdr *ip6; 522 struct mbuf *m; 523 int off = 0; 524 struct ip6ctlparam *ip6cp = NULL; 525 const struct sockaddr_in6 *sa6_src = NULL; 526 void *cmdarg; 527 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 528 struct udp_portonly { 529 u_int16_t uh_sport; 530 u_int16_t uh_dport; 531 } *uhp; 532 533 if (sa->sa_family != AF_INET6 || 534 sa->sa_len != sizeof(struct sockaddr_in6)) 535 return; 536 537 if ((unsigned)cmd >= PRC_NCMDS) 538 return; 539 if (PRC_IS_REDIRECT(cmd)) 540 notify = in6_rtchange, d = NULL; 541 else if (cmd == PRC_HOSTDEAD) 542 d = NULL; 543 else if (inet6ctlerrmap[cmd] == 0) 544 return; 545 546 /* if the parameter is from icmp6, decode it. */ 547 if (d != NULL) { 548 ip6cp = (struct ip6ctlparam *)d; 549 m = ip6cp->ip6c_m; 550 ip6 = ip6cp->ip6c_ip6; 551 off = ip6cp->ip6c_off; 552 cmdarg = ip6cp->ip6c_cmdarg; 553 sa6_src = ip6cp->ip6c_src; 554 } else { 555 m = NULL; 556 ip6 = NULL; 557 cmdarg = NULL; 558 sa6_src = &sa6_any; 559 } 560 561 if (ip6) { 562 /* 563 * XXX: We assume that when IPV6 is non NULL, 564 * M and OFF are valid. 565 */ 566 567 /* Check if we can safely examine src and dst ports. */ 568 if (m->m_pkthdr.len < off + sizeof(*uhp)) 569 return; 570 571 bzero(&uh, sizeof(uh)); 572 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 573 574 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 575 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 576 cmdarg, notify); 577 } else 578 (void)in6_pcbnotify(pcbinfo, sa, 0, 579 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 580} 581 582void 583udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 584{ 585 586 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 587} 588 589void 590udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 591{ 592 593 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 594} 595 596static int 597udp6_getcred(SYSCTL_HANDLER_ARGS) 598{ 599 struct xucred xuc; 600 struct sockaddr_in6 addrs[2]; 601 struct inpcb *inp; 602 int error; 603 604 error = priv_check(req->td, PRIV_NETINET_GETCRED); 605 if (error) 606 return (error); 607 608 if (req->newlen != sizeof(addrs)) 609 return (EINVAL); 610 if (req->oldlen != sizeof(struct xucred)) 611 return (EINVAL); 612 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 613 if (error) 614 return (error); 615 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 616 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 617 return (error); 618 } 619 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 620 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 621 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 622 if (inp != NULL) { 623 INP_RLOCK_ASSERT(inp); 624 if (inp->inp_socket == NULL) 625 error = ENOENT; 626 if (error == 0) 627 error = cr_canseesocket(req->td->td_ucred, 628 inp->inp_socket); 629 if (error == 0) 630 cru2x(inp->inp_cred, &xuc); 631 INP_RUNLOCK(inp); 632 } else 633 error = ENOENT; 634 if (error == 0) 635 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 636 return (error); 637} 638 639SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 640 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 641 642static int 643udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 644 struct mbuf *control, struct thread *td) 645{ 646 u_int32_t ulen = m->m_pkthdr.len; 647 u_int32_t plen = sizeof(struct udphdr) + ulen; 648 struct ip6_hdr *ip6; 649 struct udphdr *udp6; 650 struct in6_addr *laddr, *faddr, in6a; 651 struct sockaddr_in6 *sin6 = NULL; 652 struct ifnet *oifp = NULL; 653 int cscov_partial = 0; 654 int scope_ambiguous = 0; 655 u_short fport; 656 int error = 0; 657 uint8_t nxt; 658 uint16_t cscov = 0; 659 struct ip6_pktopts *optp, opt; 660 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 661 int flags; 662 struct sockaddr_in6 tmp; 663 664 INP_WLOCK_ASSERT(inp); 665 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 666 667 if (addr6) { 668 /* addr6 has been validated in udp6_send(). */ 669 sin6 = (struct sockaddr_in6 *)addr6; 670 671 /* protect *sin6 from overwrites */ 672 tmp = *sin6; 673 sin6 = &tmp; 674 675 /* 676 * Application should provide a proper zone ID or the use of 677 * default zone IDs should be enabled. Unfortunately, some 678 * applications do not behave as it should, so we need a 679 * workaround. Even if an appropriate ID is not determined, 680 * we'll see if we can determine the outgoing interface. If we 681 * can, determine the zone ID based on the interface below. 682 */ 683 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 684 scope_ambiguous = 1; 685 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 686 return (error); 687 } 688 689 if (control) { 690 if ((error = ip6_setpktopts(control, &opt, 691 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0) 692 goto release; 693 optp = &opt; 694 } else 695 optp = inp->in6p_outputopts; 696 697 if (sin6) { 698 faddr = &sin6->sin6_addr; 699 700 /* 701 * Since we saw no essential reason for calling in_pcbconnect, 702 * we get rid of such kind of logic, and call in6_selectsrc 703 * and in6_pcbsetport in order to fill in the local address 704 * and the local port. 705 */ 706 if (sin6->sin6_port == 0) { 707 error = EADDRNOTAVAIL; 708 goto release; 709 } 710 711 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 712 /* how about ::ffff:0.0.0.0 case? */ 713 error = EISCONN; 714 goto release; 715 } 716 717 fport = sin6->sin6_port; /* allow 0 port */ 718 719 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 720 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 721 /* 722 * I believe we should explicitly discard the 723 * packet when mapped addresses are disabled, 724 * rather than send the packet as an IPv6 one. 725 * If we chose the latter approach, the packet 726 * might be sent out on the wire based on the 727 * default route, the situation which we'd 728 * probably want to avoid. 729 * (20010421 jinmei@kame.net) 730 */ 731 error = EINVAL; 732 goto release; 733 } 734 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 735 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 736 /* 737 * when remote addr is an IPv4-mapped address, 738 * local addr should not be an IPv6 address, 739 * since you cannot determine how to map IPv6 740 * source address to IPv4. 741 */ 742 error = EINVAL; 743 goto release; 744 } 745 746 af = AF_INET; 747 } 748 749 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 750 error = in6_selectsrc(sin6, optp, inp, NULL, 751 td->td_ucred, &oifp, &in6a); 752 if (error) 753 goto release; 754 if (oifp && scope_ambiguous && 755 (error = in6_setscope(&sin6->sin6_addr, 756 oifp, NULL))) { 757 goto release; 758 } 759 laddr = &in6a; 760 } else 761 laddr = &inp->in6p_laddr; /* XXX */ 762 if (laddr == NULL) { 763 if (error == 0) 764 error = EADDRNOTAVAIL; 765 goto release; 766 } 767 if (inp->inp_lport == 0 && 768 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 769 /* Undo an address bind that may have occurred. */ 770 inp->in6p_laddr = in6addr_any; 771 goto release; 772 } 773 } else { 774 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 775 error = ENOTCONN; 776 goto release; 777 } 778 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 779 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 780 /* 781 * XXX: this case would happen when the 782 * application sets the V6ONLY flag after 783 * connecting the foreign address. 784 * Such applications should be fixed, 785 * so we bark here. 786 */ 787 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 788 "option was set for a connected socket\n"); 789 error = EINVAL; 790 goto release; 791 } else 792 af = AF_INET; 793 } 794 laddr = &inp->in6p_laddr; 795 faddr = &inp->in6p_faddr; 796 fport = inp->inp_fport; 797 } 798 799 if (af == AF_INET) 800 hlen = sizeof(struct ip); 801 802 /* 803 * Calculate data length and get a mbuf 804 * for UDP and IP6 headers. 805 */ 806 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 807 if (m == 0) { 808 error = ENOBUFS; 809 goto release; 810 } 811 812 /* 813 * Stuff checksum and output datagram. 814 */ 815 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 816 IPPROTO_UDP : IPPROTO_UDPLITE; 817 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 818 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 819 udp6->uh_dport = fport; 820 if (nxt == IPPROTO_UDPLITE) { 821 struct udpcb *up; 822 823 up = intoudpcb(inp); 824 cscov = up->u_txcslen; 825 if (cscov >= plen) 826 cscov = 0; 827 udp6->uh_ulen = htons(cscov); 828 /* 829 * For UDP-Lite, checksum coverage length of zero means 830 * the entire UDPLite packet is covered by the checksum. 831 */ 832 cscov_partial = (cscov == 0) ? 0 : 1; 833 } else if (plen <= 0xffff) 834 udp6->uh_ulen = htons((u_short)plen); 835 else 836 udp6->uh_ulen = 0; 837 udp6->uh_sum = 0; 838 839 switch (af) { 840 case AF_INET6: 841 ip6 = mtod(m, struct ip6_hdr *); 842 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 843 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 844 ip6->ip6_vfc |= IPV6_VERSION; 845 ip6->ip6_plen = htons((u_short)plen); 846 ip6->ip6_nxt = nxt; 847 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 848 ip6->ip6_src = *laddr; 849 ip6->ip6_dst = *faddr; 850 851 if (cscov_partial) { 852 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 853 sizeof(struct ip6_hdr), plen, cscov)) == 0) 854 udp6->uh_sum = 0xffff; 855 } else { 856 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 857 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 858 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 859 } 860 861 /* 862 * XXX for now assume UDP is 2-tuple. 863 * Later on this may become configurable as 4-tuple; 864 * we should support that. 865 * 866 * XXX .. and we should likely cache this in the inpcb. 867 */ 868#ifdef RSS 869 m->m_pkthdr.flowid = rss_hash_ip6_2tuple(*faddr, *laddr); 870 m->m_flags |= M_FLOWID; 871 M_HASHTYPE_SET(m, M_HASHTYPE_RSS_IPV6); 872#endif 873 flags = 0; 874 875#ifdef RSS 876 /* 877 * Don't override with the inp cached flowid. 878 * 879 * Until the whole UDP path is vetted, it may actually 880 * be incorrect. 881 */ 882 flags |= IP_NODEFAULTFLOWID; 883#endif 884 885 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 886 UDPSTAT_INC(udps_opackets); 887 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions, 888 NULL, inp); 889 break; 890 case AF_INET: 891 error = EAFNOSUPPORT; 892 goto release; 893 } 894 goto releaseopt; 895 896release: 897 m_freem(m); 898 899releaseopt: 900 if (control) { 901 ip6_clearpktopts(&opt, -1); 902 m_freem(control); 903 } 904 return (error); 905} 906 907static void 908udp6_abort(struct socket *so) 909{ 910 struct inpcb *inp; 911 struct inpcbinfo *pcbinfo; 912 913 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 914 inp = sotoinpcb(so); 915 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 916 917#ifdef INET 918 if (inp->inp_vflag & INP_IPV4) { 919 struct pr_usrreqs *pru; 920 921 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 922 (*pru->pru_abort)(so); 923 return; 924 } 925#endif 926 927 INP_WLOCK(inp); 928 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 929 INP_HASH_WLOCK(pcbinfo); 930 in6_pcbdisconnect(inp); 931 inp->in6p_laddr = in6addr_any; 932 INP_HASH_WUNLOCK(pcbinfo); 933 soisdisconnected(so); 934 } 935 INP_WUNLOCK(inp); 936} 937 938static int 939udp6_attach(struct socket *so, int proto, struct thread *td) 940{ 941 struct inpcb *inp; 942 struct inpcbinfo *pcbinfo; 943 int error; 944 945 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 946 inp = sotoinpcb(so); 947 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 948 949 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 950 error = soreserve(so, udp_sendspace, udp_recvspace); 951 if (error) 952 return (error); 953 } 954 INP_INFO_WLOCK(pcbinfo); 955 error = in_pcballoc(so, pcbinfo); 956 if (error) { 957 INP_INFO_WUNLOCK(pcbinfo); 958 return (error); 959 } 960 inp = (struct inpcb *)so->so_pcb; 961 inp->inp_vflag |= INP_IPV6; 962 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 963 inp->inp_vflag |= INP_IPV4; 964 inp->in6p_hops = -1; /* use kernel default */ 965 inp->in6p_cksum = -1; /* just to be sure */ 966 /* 967 * XXX: ugly!! 968 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 969 * because the socket may be bound to an IPv6 wildcard address, 970 * which may match an IPv4-mapped IPv6 address. 971 */ 972 inp->inp_ip_ttl = V_ip_defttl; 973 974 error = udp_newudpcb(inp); 975 if (error) { 976 in_pcbdetach(inp); 977 in_pcbfree(inp); 978 INP_INFO_WUNLOCK(pcbinfo); 979 return (error); 980 } 981 INP_WUNLOCK(inp); 982 INP_INFO_WUNLOCK(pcbinfo); 983 return (0); 984} 985 986static int 987udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 988{ 989 struct inpcb *inp; 990 struct inpcbinfo *pcbinfo; 991 int error; 992 993 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 994 inp = sotoinpcb(so); 995 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 996 997 INP_WLOCK(inp); 998 INP_HASH_WLOCK(pcbinfo); 999 inp->inp_vflag &= ~INP_IPV4; 1000 inp->inp_vflag |= INP_IPV6; 1001 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1002 struct sockaddr_in6 *sin6_p; 1003 1004 sin6_p = (struct sockaddr_in6 *)nam; 1005 1006 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1007 inp->inp_vflag |= INP_IPV4; 1008#ifdef INET 1009 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1010 struct sockaddr_in sin; 1011 1012 in6_sin6_2_sin(&sin, sin6_p); 1013 inp->inp_vflag |= INP_IPV4; 1014 inp->inp_vflag &= ~INP_IPV6; 1015 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1016 td->td_ucred); 1017 goto out; 1018 } 1019#endif 1020 } 1021 1022 error = in6_pcbbind(inp, nam, td->td_ucred); 1023#ifdef INET 1024out: 1025#endif 1026 INP_HASH_WUNLOCK(pcbinfo); 1027 INP_WUNLOCK(inp); 1028 return (error); 1029} 1030 1031static void 1032udp6_close(struct socket *so) 1033{ 1034 struct inpcb *inp; 1035 struct inpcbinfo *pcbinfo; 1036 1037 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 1038 inp = sotoinpcb(so); 1039 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1040 1041#ifdef INET 1042 if (inp->inp_vflag & INP_IPV4) { 1043 struct pr_usrreqs *pru; 1044 1045 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1046 (*pru->pru_disconnect)(so); 1047 return; 1048 } 1049#endif 1050 INP_WLOCK(inp); 1051 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1052 INP_HASH_WLOCK(pcbinfo); 1053 in6_pcbdisconnect(inp); 1054 inp->in6p_laddr = in6addr_any; 1055 INP_HASH_WUNLOCK(pcbinfo); 1056 soisdisconnected(so); 1057 } 1058 INP_WUNLOCK(inp); 1059} 1060 1061static int 1062udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1063{ 1064 struct inpcb *inp; 1065 struct inpcbinfo *pcbinfo; 1066 struct sockaddr_in6 *sin6; 1067 int error; 1068 1069 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 1070 inp = sotoinpcb(so); 1071 sin6 = (struct sockaddr_in6 *)nam; 1072 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1073 1074 /* 1075 * XXXRW: Need to clarify locking of v4/v6 flags. 1076 */ 1077 INP_WLOCK(inp); 1078#ifdef INET 1079 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1080 struct sockaddr_in sin; 1081 1082 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1083 error = EINVAL; 1084 goto out; 1085 } 1086 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1087 error = EISCONN; 1088 goto out; 1089 } 1090 in6_sin6_2_sin(&sin, sin6); 1091 inp->inp_vflag |= INP_IPV4; 1092 inp->inp_vflag &= ~INP_IPV6; 1093 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1094 if (error != 0) 1095 goto out; 1096 INP_HASH_WLOCK(pcbinfo); 1097 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1098 td->td_ucred); 1099 INP_HASH_WUNLOCK(pcbinfo); 1100 if (error == 0) 1101 soisconnected(so); 1102 goto out; 1103 } 1104#endif 1105 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1106 error = EISCONN; 1107 goto out; 1108 } 1109 inp->inp_vflag &= ~INP_IPV4; 1110 inp->inp_vflag |= INP_IPV6; 1111 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1112 if (error != 0) 1113 goto out; 1114 INP_HASH_WLOCK(pcbinfo); 1115 error = in6_pcbconnect(inp, nam, td->td_ucred); 1116 INP_HASH_WUNLOCK(pcbinfo); 1117 if (error == 0) 1118 soisconnected(so); 1119out: 1120 INP_WUNLOCK(inp); 1121 return (error); 1122} 1123 1124static void 1125udp6_detach(struct socket *so) 1126{ 1127 struct inpcb *inp; 1128 struct inpcbinfo *pcbinfo; 1129 struct udpcb *up; 1130 1131 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 1132 inp = sotoinpcb(so); 1133 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1134 1135 INP_INFO_WLOCK(pcbinfo); 1136 INP_WLOCK(inp); 1137 up = intoudpcb(inp); 1138 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1139 in_pcbdetach(inp); 1140 in_pcbfree(inp); 1141 INP_INFO_WUNLOCK(pcbinfo); 1142 udp_discardcb(up); 1143} 1144 1145static int 1146udp6_disconnect(struct socket *so) 1147{ 1148 struct inpcb *inp; 1149 struct inpcbinfo *pcbinfo; 1150 int error; 1151 1152 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 1153 inp = sotoinpcb(so); 1154 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1155 1156#ifdef INET 1157 if (inp->inp_vflag & INP_IPV4) { 1158 struct pr_usrreqs *pru; 1159 1160 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1161 (void)(*pru->pru_disconnect)(so); 1162 return (0); 1163 } 1164#endif 1165 1166 INP_WLOCK(inp); 1167 1168 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1169 error = ENOTCONN; 1170 goto out; 1171 } 1172 1173 INP_HASH_WLOCK(pcbinfo); 1174 in6_pcbdisconnect(inp); 1175 inp->in6p_laddr = in6addr_any; 1176 INP_HASH_WUNLOCK(pcbinfo); 1177 SOCK_LOCK(so); 1178 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1179 SOCK_UNLOCK(so); 1180out: 1181 INP_WUNLOCK(inp); 1182 return (0); 1183} 1184 1185static int 1186udp6_send(struct socket *so, int flags, struct mbuf *m, 1187 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1188{ 1189 struct inpcb *inp; 1190 struct inpcbinfo *pcbinfo; 1191 int error = 0; 1192 1193 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 1194 inp = sotoinpcb(so); 1195 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1196 1197 INP_WLOCK(inp); 1198 if (addr) { 1199 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1200 error = EINVAL; 1201 goto bad; 1202 } 1203 if (addr->sa_family != AF_INET6) { 1204 error = EAFNOSUPPORT; 1205 goto bad; 1206 } 1207 } 1208 1209#ifdef INET 1210 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1211 int hasv4addr; 1212 struct sockaddr_in6 *sin6 = 0; 1213 1214 if (addr == 0) 1215 hasv4addr = (inp->inp_vflag & INP_IPV4); 1216 else { 1217 sin6 = (struct sockaddr_in6 *)addr; 1218 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1219 ? 1 : 0; 1220 } 1221 if (hasv4addr) { 1222 struct pr_usrreqs *pru; 1223 1224 /* 1225 * XXXRW: We release UDP-layer locks before calling 1226 * udp_send() in order to avoid recursion. However, 1227 * this does mean there is a short window where inp's 1228 * fields are unstable. Could this lead to a 1229 * potential race in which the factors causing us to 1230 * select the UDPv4 output routine are invalidated? 1231 */ 1232 INP_WUNLOCK(inp); 1233 if (sin6) 1234 in6_sin6_2_sin_in_sock(addr); 1235 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1236 /* addr will just be freed in sendit(). */ 1237 return ((*pru->pru_send)(so, flags, m, addr, control, 1238 td)); 1239 } 1240 } 1241#endif 1242#ifdef MAC 1243 mac_inpcb_create_mbuf(inp, m); 1244#endif 1245 INP_HASH_WLOCK(pcbinfo); 1246 error = udp6_output(inp, m, addr, control, td); 1247 INP_HASH_WUNLOCK(pcbinfo); 1248#ifdef INET 1249#endif 1250 INP_WUNLOCK(inp); 1251 return (error); 1252 1253bad: 1254 INP_WUNLOCK(inp); 1255 m_freem(m); 1256 return (error); 1257} 1258 1259struct pr_usrreqs udp6_usrreqs = { 1260 .pru_abort = udp6_abort, 1261 .pru_attach = udp6_attach, 1262 .pru_bind = udp6_bind, 1263 .pru_connect = udp6_connect, 1264 .pru_control = in6_control, 1265 .pru_detach = udp6_detach, 1266 .pru_disconnect = udp6_disconnect, 1267 .pru_peeraddr = in6_mapped_peeraddr, 1268 .pru_send = udp6_send, 1269 .pru_shutdown = udp_shutdown, 1270 .pru_sockaddr = in6_mapped_sockaddr, 1271 .pru_soreceive = soreceive_dgram, 1272 .pru_sosend = sosend_dgram, 1273 .pru_sosetlabel = in_pcbsosetlabel, 1274 .pru_close = udp6_close 1275}; 1276