1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * Copyright (c) 2010-2011 Juniper Networks, Inc. 6 * Copyright (c) 2014 Kevin Lo 7 * All rights reserved. 8 * 9 * Portions of this software were developed by Robert N. M. Watson under 10 * contract to Juniper Networks, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the project nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ 37 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ 38 */ 39 40 /*- 41 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 42 * The Regents of the University of California. 43 * All rights reserved. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. Neither the name of the University nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 * 69 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 70 */ 71 72 #include <sys/cdefs.h> 73 __FBSDID("$FreeBSD$"); 74 75 #include "opt_inet.h" 76 #include "opt_inet6.h" 77 #include "opt_ipsec.h" 78 #include "opt_rss.h" 79 80 #include <sys/param.h> 81 #include <sys/jail.h> 82 #include <sys/kernel.h> 83 #include <sys/lock.h> 84 #include <sys/mbuf.h> 85 #include <sys/priv.h> 86 #include <sys/proc.h> 87 #include <sys/protosw.h> 88 #include <sys/sdt.h> 89 #include <sys/signalvar.h> 90 #include <sys/socket.h> 91 #include <sys/socketvar.h> 92 #include <sys/sx.h> 93 #include <sys/sysctl.h> 94 #include <sys/syslog.h> 95 #include <sys/systm.h> 96 97 #include <net/if.h> 98 #include <net/if_var.h> 99 #include <net/if_types.h> 100 #include <net/route.h> 101 #include <net/rss_config.h> 102 103 #include <netinet/in.h> 104 #include <netinet/in_kdtrace.h> 105 #include <netinet/in_pcb.h> 106 #include <netinet/in_systm.h> 107 #include <netinet/in_var.h> 108 #include <netinet/ip.h> 109 #include <netinet/ip6.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> 115 116 #include <netinet6/ip6protosw.h> 117 #include <netinet6/ip6_var.h> 118 #include <netinet6/in6_pcb.h> 119 #include <netinet6/in6_rss.h> 120 #include <netinet6/udp6_var.h> 121 #include <netinet6/scope6_var.h> 122 123 #include <netipsec/ipsec_support.h> 124 125 #include <security/mac/mac_framework.h> 126 127 VNET_DEFINE(int, zero_checksum_port) = 0; 128 #define V_zero_checksum_port VNET(zero_checksum_port) 129 SYSCTL_INT(_net_inet6_udp6, OID_AUTO, rfc6935_port, CTLFLAG_VNET | CTLFLAG_RW, 130 &VNET_NAME(zero_checksum_port), 0, 131 "Zero UDP checksum allowed for traffic to/from this port."); 132 /* 133 * UDP protocol implementation. 134 * Per RFC 768, August, 1980. 135 */ 136 137 extern struct protosw inetsw[]; 138 static void udp6_detach(struct socket *so); 139 140 static int 141 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 142 struct sockaddr_in6 *fromsa) 143 { 144 struct socket *so; 145 struct mbuf *opts = NULL, *tmp_opts; 146 struct udpcb *up; 147 148 INP_LOCK_ASSERT(inp); 149 150 /* 151 * Engage the tunneling protocol. 152 */ 153 up = intoudpcb(inp); 154 if (up->u_tun_func != NULL) { 155 in_pcbref(inp); 156 INP_RUNLOCK(inp); 157 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&fromsa[0], 158 up->u_tun_ctx); 159 INP_RLOCK(inp); 160 return (in_pcbrele_rlocked(inp)); 161 } 162 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 163 /* Check AH/ESP integrity. */ 164 if (IPSEC_ENABLED(ipv6)) { 165 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) { 166 m_freem(n); 167 return (0); 168 } 169 } 170 #endif /* IPSEC */ 171 #ifdef MAC 172 if (mac_inpcb_check_deliver(inp, n) != 0) { 173 m_freem(n); 174 return (0); 175 } 176 #endif 177 opts = NULL; 178 if (inp->inp_flags & INP_CONTROLOPTS || 179 inp->inp_socket->so_options & SO_TIMESTAMP) 180 ip6_savecontrol(inp, n, &opts); 181 if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) { 182 tmp_opts = sbcreatecontrol((caddr_t)&fromsa[1], 183 sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, IPPROTO_IPV6); 184 if (tmp_opts) { 185 if (opts) { 186 tmp_opts->m_next = opts; 187 opts = tmp_opts; 188 } else 189 opts = tmp_opts; 190 } 191 } 192 m_adj(n, off + sizeof(struct udphdr)); 193 194 so = inp->inp_socket; 195 SOCKBUF_LOCK(&so->so_rcv); 196 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n, 197 opts) == 0) { 198 SOCKBUF_UNLOCK(&so->so_rcv); 199 m_freem(n); 200 if (opts) 201 m_freem(opts); 202 UDPSTAT_INC(udps_fullsock); 203 } else 204 sorwakeup_locked(so); 205 return (0); 206 } 207 208 int 209 udp6_input(struct mbuf **mp, int *offp, int proto) 210 { 211 struct mbuf *m = *mp; 212 struct ifnet *ifp; 213 struct ip6_hdr *ip6; 214 struct udphdr *uh; 215 struct inpcb *inp; 216 struct inpcbinfo *pcbinfo; 217 struct udpcb *up; 218 int off = *offp; 219 int cscov_partial; 220 int plen, ulen; 221 struct sockaddr_in6 fromsa[2]; 222 struct m_tag *fwd_tag; 223 uint16_t uh_sum; 224 uint8_t nxt; 225 226 NET_EPOCH_ASSERT(); 227 228 ifp = m->m_pkthdr.rcvif; 229 230 if (m->m_len < off + sizeof(struct udphdr)) { 231 m = m_pullup(m, off + sizeof(struct udphdr)); 232 if (m == NULL) { 233 IP6STAT_INC(ip6s_exthdrtoolong); 234 *mp = NULL; 235 return (IPPROTO_DONE); 236 } 237 } 238 ip6 = mtod(m, struct ip6_hdr *); 239 uh = (struct udphdr *)((caddr_t)ip6 + off); 240 241 UDPSTAT_INC(udps_ipackets); 242 243 /* 244 * Destination port of 0 is illegal, based on RFC768. 245 */ 246 if (uh->uh_dport == 0) 247 goto badunlocked; 248 249 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 250 ulen = ntohs((u_short)uh->uh_ulen); 251 252 nxt = proto; 253 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 254 if (nxt == IPPROTO_UDPLITE) { 255 /* Zero means checksum over the complete packet. */ 256 if (ulen == 0) 257 ulen = plen; 258 if (ulen == plen) 259 cscov_partial = 0; 260 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 261 /* XXX: What is the right UDPLite MIB counter? */ 262 goto badunlocked; 263 } 264 if (uh->uh_sum == 0) { 265 /* XXX: What is the right UDPLite MIB counter? */ 266 goto badunlocked; 267 } 268 } else { 269 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 270 UDPSTAT_INC(udps_badlen); 271 goto badunlocked; 272 } 273 if (uh->uh_sum == 0) { 274 UDPSTAT_INC(udps_nosum); 275 /* 276 * dport 0 was rejected earlier so this is OK even if 277 * zero_checksum_port is 0 (which is its default value). 278 */ 279 if (ntohs(uh->uh_dport) == V_zero_checksum_port) 280 goto skip_checksum; 281 else 282 goto badunlocked; 283 } 284 } 285 286 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 287 !cscov_partial) { 288 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 289 uh_sum = m->m_pkthdr.csum_data; 290 else 291 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 292 m->m_pkthdr.csum_data); 293 uh_sum ^= 0xffff; 294 } else 295 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 296 297 if (uh_sum != 0) { 298 UDPSTAT_INC(udps_badsum); 299 goto badunlocked; 300 } 301 302 skip_checksum: 303 /* 304 * Construct sockaddr format source address. 305 */ 306 init_sin6(&fromsa[0], m, 0); 307 fromsa[0].sin6_port = uh->uh_sport; 308 init_sin6(&fromsa[1], m, 1); 309 fromsa[1].sin6_port = uh->uh_dport; 310 311 pcbinfo = udp_get_inpcbinfo(nxt); 312 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 313 struct inpcb *last; 314 struct inpcbhead *pcblist; 315 struct ip6_moptions *imo; 316 317 /* 318 * In the event that laddr should be set to the link-local 319 * address (this happens in RIPng), the multicast address 320 * specified in the received packet will not match laddr. To 321 * handle this situation, matching is relaxed if the 322 * receiving interface is the same as one specified in the 323 * socket and if the destination multicast address matches 324 * one of the multicast groups specified in the socket. 325 */ 326 327 /* 328 * KAME note: traditionally we dropped udpiphdr from mbuf 329 * here. We need udphdr for IPsec processing so we do that 330 * later. 331 */ 332 pcblist = udp_get_pcblist(nxt); 333 last = NULL; 334 CK_LIST_FOREACH(inp, pcblist, inp_list) { 335 if ((inp->inp_vflag & INP_IPV6) == 0) 336 continue; 337 if (inp->inp_lport != uh->uh_dport) 338 continue; 339 if (inp->inp_fport != 0 && 340 inp->inp_fport != uh->uh_sport) 341 continue; 342 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 343 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 344 &ip6->ip6_dst)) 345 continue; 346 } 347 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 348 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 349 &ip6->ip6_src) || 350 inp->inp_fport != uh->uh_sport) 351 continue; 352 } 353 354 /* 355 * XXXRW: Because we weren't holding either the inpcb 356 * or the hash lock when we checked for a match 357 * before, we should probably recheck now that the 358 * inpcb lock is (supposed to be) held. 359 */ 360 361 /* 362 * Handle socket delivery policy for any-source 363 * and source-specific multicast. [RFC3678] 364 */ 365 imo = inp->in6p_moptions; 366 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 367 struct sockaddr_in6 mcaddr; 368 int blocked; 369 370 INP_RLOCK(inp); 371 if (__predict_false(inp->inp_flags2 & INP_FREED)) { 372 INP_RUNLOCK(inp); 373 continue; 374 } 375 376 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 377 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 378 mcaddr.sin6_family = AF_INET6; 379 mcaddr.sin6_addr = ip6->ip6_dst; 380 381 blocked = im6o_mc_filter(imo, ifp, 382 (struct sockaddr *)&mcaddr, 383 (struct sockaddr *)&fromsa[0]); 384 if (blocked != MCAST_PASS) { 385 if (blocked == MCAST_NOTGMEMBER) 386 IP6STAT_INC(ip6s_notmember); 387 if (blocked == MCAST_NOTSMEMBER || 388 blocked == MCAST_MUTED) 389 UDPSTAT_INC(udps_filtermcast); 390 INP_RUNLOCK(inp); /* XXX */ 391 continue; 392 } 393 394 INP_RUNLOCK(inp); 395 } 396 if (last != NULL) { 397 struct mbuf *n; 398 399 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != 400 NULL) { 401 INP_RLOCK(last); 402 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) { 403 if (nxt == IPPROTO_UDPLITE) 404 UDPLITE_PROBE(receive, NULL, last, 405 ip6, last, uh); 406 else 407 UDP_PROBE(receive, NULL, last, 408 ip6, last, uh); 409 if (udp6_append(last, n, off, fromsa)) { 410 /* XXX-BZ do we leak m here? */ 411 *mp = NULL; 412 return (IPPROTO_DONE); 413 } 414 } 415 INP_RUNLOCK(last); 416 } 417 } 418 last = inp; 419 /* 420 * Don't look for additional matches if this one does 421 * not have either the SO_REUSEPORT or SO_REUSEADDR 422 * socket options set. This heuristic avoids 423 * searching through all pcbs in the common case of a 424 * non-shared port. It assumes that an application 425 * will never clear these options after setting them. 426 */ 427 if ((last->inp_socket->so_options & 428 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0) 429 break; 430 } 431 432 if (last == NULL) { 433 /* 434 * No matching pcb found; discard datagram. (No need 435 * to send an ICMP Port Unreachable for a broadcast 436 * or multicast datgram.) 437 */ 438 UDPSTAT_INC(udps_noport); 439 UDPSTAT_INC(udps_noportmcast); 440 goto badunlocked; 441 } 442 INP_RLOCK(last); 443 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) { 444 if (nxt == IPPROTO_UDPLITE) 445 UDPLITE_PROBE(receive, NULL, last, ip6, last, uh); 446 else 447 UDP_PROBE(receive, NULL, last, ip6, last, uh); 448 if (udp6_append(last, m, off, fromsa) == 0) 449 INP_RUNLOCK(last); 450 } else 451 INP_RUNLOCK(last); 452 *mp = NULL; 453 return (IPPROTO_DONE); 454 } 455 /* 456 * Locate pcb for datagram. 457 */ 458 459 /* 460 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 461 */ 462 if ((m->m_flags & M_IP6_NEXTHOP) && 463 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 464 struct sockaddr_in6 *next_hop6; 465 466 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 467 468 /* 469 * Transparently forwarded. Pretend to be the destination. 470 * Already got one like this? 471 */ 472 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 473 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 474 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 475 if (!inp) { 476 /* 477 * It's new. Try to find the ambushing socket. 478 * Because we've rewritten the destination address, 479 * any hardware-generated hash is ignored. 480 */ 481 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 482 uh->uh_sport, &next_hop6->sin6_addr, 483 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 484 uh->uh_dport, INPLOOKUP_WILDCARD | 485 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 486 } 487 /* Remove the tag from the packet. We don't need it anymore. */ 488 m_tag_delete(m, fwd_tag); 489 m->m_flags &= ~M_IP6_NEXTHOP; 490 } else 491 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 492 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 493 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 494 m->m_pkthdr.rcvif, m); 495 if (inp == NULL) { 496 if (V_udp_log_in_vain) { 497 char ip6bufs[INET6_ADDRSTRLEN]; 498 char ip6bufd[INET6_ADDRSTRLEN]; 499 500 log(LOG_INFO, 501 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 502 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 503 ntohs(uh->uh_dport), 504 ip6_sprintf(ip6bufs, &ip6->ip6_src), 505 ntohs(uh->uh_sport)); 506 } 507 if (nxt == IPPROTO_UDPLITE) 508 UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh); 509 else 510 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh); 511 UDPSTAT_INC(udps_noport); 512 if (m->m_flags & M_MCAST) { 513 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 514 UDPSTAT_INC(udps_noportmcast); 515 goto badunlocked; 516 } 517 if (V_udp_blackhole) 518 goto badunlocked; 519 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 520 *mp = NULL; 521 return (IPPROTO_DONE); 522 } 523 INP_RLOCK_ASSERT(inp); 524 up = intoudpcb(inp); 525 if (cscov_partial) { 526 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 527 INP_RUNLOCK(inp); 528 m_freem(m); 529 *mp = NULL; 530 return (IPPROTO_DONE); 531 } 532 } 533 if (nxt == IPPROTO_UDPLITE) 534 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh); 535 else 536 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 537 if (udp6_append(inp, m, off, fromsa) == 0) 538 INP_RUNLOCK(inp); 539 *mp = NULL; 540 return (IPPROTO_DONE); 541 542 badunlocked: 543 m_freem(m); 544 *mp = NULL; 545 return (IPPROTO_DONE); 546 } 547 548 static void 549 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 550 struct inpcbinfo *pcbinfo) 551 { 552 struct udphdr uh; 553 struct ip6_hdr *ip6; 554 struct mbuf *m; 555 int off = 0; 556 struct ip6ctlparam *ip6cp = NULL; 557 const struct sockaddr_in6 *sa6_src = NULL; 558 void *cmdarg; 559 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 560 struct udp_portonly { 561 u_int16_t uh_sport; 562 u_int16_t uh_dport; 563 } *uhp; 564 565 if (sa->sa_family != AF_INET6 || 566 sa->sa_len != sizeof(struct sockaddr_in6)) 567 return; 568 569 if ((unsigned)cmd >= PRC_NCMDS) 570 return; 571 if (PRC_IS_REDIRECT(cmd)) 572 notify = in6_rtchange, d = NULL; 573 else if (cmd == PRC_HOSTDEAD) 574 d = NULL; 575 else if (inet6ctlerrmap[cmd] == 0) 576 return; 577 578 /* if the parameter is from icmp6, decode it. */ 579 if (d != NULL) { 580 ip6cp = (struct ip6ctlparam *)d; 581 m = ip6cp->ip6c_m; 582 ip6 = ip6cp->ip6c_ip6; 583 off = ip6cp->ip6c_off; 584 cmdarg = ip6cp->ip6c_cmdarg; 585 sa6_src = ip6cp->ip6c_src; 586 } else { 587 m = NULL; 588 ip6 = NULL; 589 cmdarg = NULL; 590 sa6_src = &sa6_any; 591 } 592 593 if (ip6) { 594 /* 595 * XXX: We assume that when IPV6 is non NULL, 596 * M and OFF are valid. 597 */ 598 599 /* Check if we can safely examine src and dst ports. */ 600 if (m->m_pkthdr.len < off + sizeof(*uhp)) 601 return; 602 603 bzero(&uh, sizeof(uh)); 604 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 605 606 if (!PRC_IS_REDIRECT(cmd)) { 607 /* Check to see if its tunneled */ 608 struct inpcb *inp; 609 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 610 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 611 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 612 m->m_pkthdr.rcvif, m); 613 if (inp != NULL) { 614 struct udpcb *up; 615 616 up = intoudpcb(inp); 617 if (up->u_icmp_func) { 618 /* Yes it is. */ 619 INP_RUNLOCK(inp); 620 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 621 d, up->u_tun_ctx); 622 return; 623 } else { 624 /* Can't find it. */ 625 INP_RUNLOCK(inp); 626 } 627 } 628 } 629 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 630 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 631 cmdarg, notify); 632 } else 633 (void)in6_pcbnotify(pcbinfo, sa, 0, 634 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 635 } 636 637 void 638 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 639 { 640 641 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 642 } 643 644 void 645 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 646 { 647 648 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 649 } 650 651 static int 652 udp6_getcred(SYSCTL_HANDLER_ARGS) 653 { 654 struct xucred xuc; 655 struct sockaddr_in6 addrs[2]; 656 struct epoch_tracker et; 657 struct inpcb *inp; 658 int error; 659 660 error = priv_check(req->td, PRIV_NETINET_GETCRED); 661 if (error) 662 return (error); 663 664 if (req->newlen != sizeof(addrs)) 665 return (EINVAL); 666 if (req->oldlen != sizeof(struct xucred)) 667 return (EINVAL); 668 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 669 if (error) 670 return (error); 671 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 672 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 673 return (error); 674 } 675 NET_EPOCH_ENTER(et); 676 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 677 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 678 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 679 NET_EPOCH_EXIT(et); 680 if (inp != NULL) { 681 INP_RLOCK_ASSERT(inp); 682 if (inp->inp_socket == NULL) 683 error = ENOENT; 684 if (error == 0) 685 error = cr_canseesocket(req->td->td_ucred, 686 inp->inp_socket); 687 if (error == 0) 688 cru2x(inp->inp_cred, &xuc); 689 INP_RUNLOCK(inp); 690 } else 691 error = ENOENT; 692 if (error == 0) 693 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 694 return (error); 695 } 696 697 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, 698 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE, 699 0, 0, udp6_getcred, "S,xucred", 700 "Get the xucred of a UDP6 connection"); 701 702 static int 703 udp6_output(struct socket *so, int flags_arg, struct mbuf *m, 704 struct sockaddr *addr6, struct mbuf *control, struct thread *td) 705 { 706 struct inpcb *inp; 707 struct ip6_hdr *ip6; 708 struct udphdr *udp6; 709 struct in6_addr *laddr, *faddr, in6a; 710 struct ip6_pktopts *optp, opt; 711 struct sockaddr_in6 *sin6, tmp; 712 struct epoch_tracker et; 713 int cscov_partial, error, flags, hlen, scope_ambiguous; 714 u_int32_t ulen, plen; 715 uint16_t cscov; 716 u_short fport; 717 uint8_t nxt; 718 719 /* addr6 has been validated in udp6_send(). */ 720 sin6 = (struct sockaddr_in6 *)addr6; 721 722 /* 723 * In contrast to to IPv4 we do not validate the max. packet length 724 * here due to IPv6 Jumbograms (RFC2675). 725 */ 726 727 scope_ambiguous = 0; 728 if (sin6) { 729 /* Protect *addr6 from overwrites. */ 730 tmp = *sin6; 731 sin6 = &tmp; 732 733 /* 734 * Application should provide a proper zone ID or the use of 735 * default zone IDs should be enabled. Unfortunately, some 736 * applications do not behave as it should, so we need a 737 * workaround. Even if an appropriate ID is not determined, 738 * we'll see if we can determine the outgoing interface. If we 739 * can, determine the zone ID based on the interface below. 740 */ 741 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 742 scope_ambiguous = 1; 743 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) { 744 if (control) 745 m_freem(control); 746 m_freem(m); 747 return (error); 748 } 749 } 750 751 inp = sotoinpcb(so); 752 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 753 /* 754 * In the following cases we want a write lock on the inp for either 755 * local operations or for possible route cache updates in the IPv6 756 * output path: 757 * - on connected sockets (sin6 is NULL) for route cache updates, 758 * - when we are not bound to an address and source port (it is 759 * in6_pcbsetport() which will require the write lock). 760 * 761 * We check the inp fields before actually locking the inp, so 762 * here exists a race, and we may WLOCK the inp and end with already 763 * bound one by other thread. This is fine. 764 */ 765 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 766 inp->inp_lport == 0)) 767 INP_WLOCK(inp); 768 else 769 INP_RLOCK(inp); 770 771 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 772 IPPROTO_UDP : IPPROTO_UDPLITE; 773 774 #ifdef INET 775 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 776 int hasv4addr; 777 778 if (sin6 == NULL) 779 hasv4addr = (inp->inp_vflag & INP_IPV4); 780 else 781 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 782 ? 1 : 0; 783 if (hasv4addr) { 784 struct pr_usrreqs *pru; 785 786 /* 787 * XXXRW: We release UDP-layer locks before calling 788 * udp_send() in order to avoid recursion. However, 789 * this does mean there is a short window where inp's 790 * fields are unstable. Could this lead to a 791 * potential race in which the factors causing us to 792 * select the UDPv4 output routine are invalidated? 793 */ 794 INP_UNLOCK(inp); 795 if (sin6) 796 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6); 797 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 798 /* addr will just be freed in sendit(). */ 799 return ((*pru->pru_send)(so, flags_arg | PRUS_IPV6, m, 800 (struct sockaddr *)sin6, control, td)); 801 } 802 } else 803 #endif 804 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 805 /* 806 * Given this is either an IPv6-only socket or no INET is 807 * supported we will fail the send if the given destination 808 * address is a v4mapped address. 809 * 810 * XXXGL: do we leak m and control? 811 */ 812 INP_UNLOCK(inp); 813 return (EINVAL); 814 } 815 816 if (control) { 817 if ((error = ip6_setpktopts(control, &opt, 818 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) { 819 INP_UNLOCK(inp); 820 ip6_clearpktopts(&opt, -1); 821 if (control) 822 m_freem(control); 823 m_freem(m); 824 return (error); 825 } 826 optp = &opt; 827 } else 828 optp = inp->in6p_outputopts; 829 830 NET_EPOCH_ENTER(et); 831 if (sin6) { 832 /* 833 * Since we saw no essential reason for calling in_pcbconnect, 834 * we get rid of such kind of logic, and call in6_selectsrc 835 * and in6_pcbsetport in order to fill in the local address 836 * and the local port. 837 */ 838 if (sin6->sin6_port == 0) { 839 error = EADDRNOTAVAIL; 840 goto release; 841 } 842 843 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 844 /* how about ::ffff:0.0.0.0 case? */ 845 error = EISCONN; 846 goto release; 847 } 848 849 /* 850 * Given we handle the v4mapped case in the INET block above 851 * assert here that it must not happen anymore. 852 */ 853 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr), 854 ("%s: sin6(%p)->sin6_addr is v4mapped which we " 855 "should have handled.", __func__, sin6)); 856 857 /* This only requires read-locking. */ 858 error = in6_selectsrc_socket(sin6, optp, inp, 859 td->td_ucred, scope_ambiguous, &in6a, NULL); 860 if (error) 861 goto release; 862 laddr = &in6a; 863 864 if (inp->inp_lport == 0) { 865 struct inpcbinfo *pcbinfo; 866 867 INP_WLOCK_ASSERT(inp); 868 869 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 870 INP_HASH_WLOCK(pcbinfo); 871 error = in6_pcbsetport(laddr, inp, td->td_ucred); 872 INP_HASH_WUNLOCK(pcbinfo); 873 if (error != 0) { 874 /* Undo an address bind that may have occurred. */ 875 inp->in6p_laddr = in6addr_any; 876 goto release; 877 } 878 } 879 faddr = &sin6->sin6_addr; 880 fport = sin6->sin6_port; /* allow 0 port */ 881 882 } else { 883 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 884 error = ENOTCONN; 885 goto release; 886 } 887 laddr = &inp->in6p_laddr; 888 faddr = &inp->in6p_faddr; 889 fport = inp->inp_fport; 890 } 891 892 ulen = m->m_pkthdr.len; 893 plen = sizeof(struct udphdr) + ulen; 894 hlen = sizeof(struct ip6_hdr); 895 896 /* 897 * Calculate data length and get a mbuf 898 * for UDP and IP6 headers. 899 */ 900 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 901 if (m == NULL) { 902 error = ENOBUFS; 903 goto release; 904 } 905 906 /* 907 * Stuff checksum and output datagram. 908 */ 909 cscov = cscov_partial = 0; 910 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 911 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 912 udp6->uh_dport = fport; 913 if (nxt == IPPROTO_UDPLITE) { 914 struct udpcb *up; 915 916 up = intoudpcb(inp); 917 cscov = up->u_txcslen; 918 if (cscov >= plen) 919 cscov = 0; 920 udp6->uh_ulen = htons(cscov); 921 /* 922 * For UDP-Lite, checksum coverage length of zero means 923 * the entire UDPLite packet is covered by the checksum. 924 */ 925 cscov_partial = (cscov == 0) ? 0 : 1; 926 } else if (plen <= 0xffff) 927 udp6->uh_ulen = htons((u_short)plen); 928 else 929 udp6->uh_ulen = 0; 930 udp6->uh_sum = 0; 931 932 ip6 = mtod(m, struct ip6_hdr *); 933 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 934 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 935 ip6->ip6_vfc |= IPV6_VERSION; 936 ip6->ip6_plen = htons((u_short)plen); 937 ip6->ip6_nxt = nxt; 938 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 939 ip6->ip6_src = *laddr; 940 ip6->ip6_dst = *faddr; 941 942 #ifdef MAC 943 mac_inpcb_create_mbuf(inp, m); 944 #endif 945 946 if (cscov_partial) { 947 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 948 sizeof(struct ip6_hdr), plen, cscov)) == 0) 949 udp6->uh_sum = 0xffff; 950 } else { 951 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 952 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 953 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 954 } 955 956 flags = 0; 957 #ifdef RSS 958 { 959 uint32_t hash_val, hash_type; 960 uint8_t pr; 961 962 pr = inp->inp_socket->so_proto->pr_protocol; 963 /* 964 * Calculate an appropriate RSS hash for UDP and 965 * UDP Lite. 966 * 967 * The called function will take care of figuring out 968 * whether a 2-tuple or 4-tuple hash is required based 969 * on the currently configured scheme. 970 * 971 * Later later on connected socket values should be 972 * cached in the inpcb and reused, rather than constantly 973 * re-calculating it. 974 * 975 * UDP Lite is a different protocol number and will 976 * likely end up being hashed as a 2-tuple until 977 * RSS / NICs grow UDP Lite protocol awareness. 978 */ 979 if (rss_proto_software_hash_v6(faddr, laddr, fport, 980 inp->inp_lport, pr, &hash_val, &hash_type) == 0) { 981 m->m_pkthdr.flowid = hash_val; 982 M_HASHTYPE_SET(m, hash_type); 983 } 984 985 /* 986 * Don't override with the inp cached flowid. 987 * 988 * Until the whole UDP path is vetted, it may actually 989 * be incorrect. 990 */ 991 flags |= IP_NODEFAULTFLOWID; 992 } 993 #endif 994 995 UDPSTAT_INC(udps_opackets); 996 if (nxt == IPPROTO_UDPLITE) 997 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6); 998 else 999 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 1000 error = ip6_output(m, optp, 1001 INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags, 1002 inp->in6p_moptions, NULL, inp); 1003 INP_UNLOCK(inp); 1004 NET_EPOCH_EXIT(et); 1005 1006 if (control) { 1007 ip6_clearpktopts(&opt, -1); 1008 m_freem(control); 1009 } 1010 return (error); 1011 1012 release: 1013 INP_UNLOCK(inp); 1014 NET_EPOCH_EXIT(et); 1015 if (control) { 1016 ip6_clearpktopts(&opt, -1); 1017 m_freem(control); 1018 } 1019 m_freem(m); 1020 1021 return (error); 1022 } 1023 1024 static void 1025 udp6_abort(struct socket *so) 1026 { 1027 struct inpcb *inp; 1028 struct inpcbinfo *pcbinfo; 1029 1030 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1031 inp = sotoinpcb(so); 1032 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 1033 1034 INP_WLOCK(inp); 1035 #ifdef INET 1036 if (inp->inp_vflag & INP_IPV4) { 1037 struct pr_usrreqs *pru; 1038 uint8_t nxt; 1039 1040 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1041 IPPROTO_UDP : IPPROTO_UDPLITE; 1042 INP_WUNLOCK(inp); 1043 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1044 (*pru->pru_abort)(so); 1045 return; 1046 } 1047 #endif 1048 1049 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1050 INP_HASH_WLOCK(pcbinfo); 1051 in6_pcbdisconnect(inp); 1052 inp->in6p_laddr = in6addr_any; 1053 INP_HASH_WUNLOCK(pcbinfo); 1054 soisdisconnected(so); 1055 } 1056 INP_WUNLOCK(inp); 1057 } 1058 1059 static int 1060 udp6_attach(struct socket *so, int proto, struct thread *td) 1061 { 1062 struct inpcb *inp; 1063 struct inpcbinfo *pcbinfo; 1064 int error; 1065 1066 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1067 inp = sotoinpcb(so); 1068 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 1069 1070 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1071 error = soreserve(so, udp_sendspace, udp_recvspace); 1072 if (error) 1073 return (error); 1074 } 1075 INP_INFO_WLOCK(pcbinfo); 1076 error = in_pcballoc(so, pcbinfo); 1077 if (error) { 1078 INP_INFO_WUNLOCK(pcbinfo); 1079 return (error); 1080 } 1081 inp = (struct inpcb *)so->so_pcb; 1082 inp->inp_vflag |= INP_IPV6; 1083 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 1084 inp->inp_vflag |= INP_IPV4; 1085 inp->in6p_hops = -1; /* use kernel default */ 1086 inp->in6p_cksum = -1; /* just to be sure */ 1087 /* 1088 * XXX: ugly!! 1089 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 1090 * because the socket may be bound to an IPv6 wildcard address, 1091 * which may match an IPv4-mapped IPv6 address. 1092 */ 1093 inp->inp_ip_ttl = V_ip_defttl; 1094 1095 error = udp_newudpcb(inp); 1096 if (error) { 1097 in_pcbdetach(inp); 1098 in_pcbfree(inp); 1099 INP_INFO_WUNLOCK(pcbinfo); 1100 return (error); 1101 } 1102 INP_WUNLOCK(inp); 1103 INP_INFO_WUNLOCK(pcbinfo); 1104 return (0); 1105 } 1106 1107 static int 1108 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1109 { 1110 struct inpcb *inp; 1111 struct inpcbinfo *pcbinfo; 1112 int error; 1113 u_char vflagsav; 1114 1115 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1116 inp = sotoinpcb(so); 1117 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1118 1119 INP_WLOCK(inp); 1120 INP_HASH_WLOCK(pcbinfo); 1121 vflagsav = inp->inp_vflag; 1122 inp->inp_vflag &= ~INP_IPV4; 1123 inp->inp_vflag |= INP_IPV6; 1124 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1125 struct sockaddr_in6 *sin6_p; 1126 1127 sin6_p = (struct sockaddr_in6 *)nam; 1128 1129 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1130 inp->inp_vflag |= INP_IPV4; 1131 #ifdef INET 1132 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1133 struct sockaddr_in sin; 1134 1135 in6_sin6_2_sin(&sin, sin6_p); 1136 inp->inp_vflag |= INP_IPV4; 1137 inp->inp_vflag &= ~INP_IPV6; 1138 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1139 td->td_ucred); 1140 goto out; 1141 } 1142 #endif 1143 } 1144 1145 error = in6_pcbbind(inp, nam, td->td_ucred); 1146 #ifdef INET 1147 out: 1148 #endif 1149 if (error != 0) 1150 inp->inp_vflag = vflagsav; 1151 INP_HASH_WUNLOCK(pcbinfo); 1152 INP_WUNLOCK(inp); 1153 return (error); 1154 } 1155 1156 static void 1157 udp6_close(struct socket *so) 1158 { 1159 struct inpcb *inp; 1160 struct inpcbinfo *pcbinfo; 1161 1162 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1163 inp = sotoinpcb(so); 1164 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1165 1166 INP_WLOCK(inp); 1167 #ifdef INET 1168 if (inp->inp_vflag & INP_IPV4) { 1169 struct pr_usrreqs *pru; 1170 uint8_t nxt; 1171 1172 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1173 IPPROTO_UDP : IPPROTO_UDPLITE; 1174 INP_WUNLOCK(inp); 1175 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1176 (*pru->pru_disconnect)(so); 1177 return; 1178 } 1179 #endif 1180 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1181 INP_HASH_WLOCK(pcbinfo); 1182 in6_pcbdisconnect(inp); 1183 inp->in6p_laddr = in6addr_any; 1184 INP_HASH_WUNLOCK(pcbinfo); 1185 soisdisconnected(so); 1186 } 1187 INP_WUNLOCK(inp); 1188 } 1189 1190 static int 1191 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1192 { 1193 #ifdef INET 1194 struct epoch_tracker et; 1195 #endif 1196 struct inpcb *inp; 1197 struct inpcbinfo *pcbinfo; 1198 struct sockaddr_in6 *sin6; 1199 int error; 1200 u_char vflagsav; 1201 1202 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1203 inp = sotoinpcb(so); 1204 sin6 = (struct sockaddr_in6 *)nam; 1205 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1206 1207 /* 1208 * XXXRW: Need to clarify locking of v4/v6 flags. 1209 */ 1210 INP_WLOCK(inp); 1211 #ifdef INET 1212 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1213 struct sockaddr_in sin; 1214 1215 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1216 error = EINVAL; 1217 goto out; 1218 } 1219 if ((inp->inp_vflag & INP_IPV4) == 0) { 1220 error = EAFNOSUPPORT; 1221 goto out; 1222 } 1223 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1224 error = EISCONN; 1225 goto out; 1226 } 1227 in6_sin6_2_sin(&sin, sin6); 1228 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1229 if (error != 0) 1230 goto out; 1231 vflagsav = inp->inp_vflag; 1232 inp->inp_vflag |= INP_IPV4; 1233 inp->inp_vflag &= ~INP_IPV6; 1234 NET_EPOCH_ENTER(et); 1235 INP_HASH_WLOCK(pcbinfo); 1236 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1237 td->td_ucred); 1238 INP_HASH_WUNLOCK(pcbinfo); 1239 NET_EPOCH_EXIT(et); 1240 /* 1241 * If connect succeeds, mark socket as connected. If 1242 * connect fails and socket is unbound, reset inp_vflag 1243 * field. 1244 */ 1245 if (error == 0) 1246 soisconnected(so); 1247 else if (inp->inp_laddr.s_addr == INADDR_ANY && 1248 inp->inp_lport == 0) 1249 inp->inp_vflag = vflagsav; 1250 goto out; 1251 } else { 1252 if ((inp->inp_vflag & INP_IPV6) == 0) { 1253 error = EAFNOSUPPORT; 1254 goto out; 1255 } 1256 } 1257 #endif 1258 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1259 error = EISCONN; 1260 goto out; 1261 } 1262 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1263 if (error != 0) 1264 goto out; 1265 vflagsav = inp->inp_vflag; 1266 inp->inp_vflag &= ~INP_IPV4; 1267 inp->inp_vflag |= INP_IPV6; 1268 INP_HASH_WLOCK(pcbinfo); 1269 error = in6_pcbconnect(inp, nam, td->td_ucred); 1270 INP_HASH_WUNLOCK(pcbinfo); 1271 /* 1272 * If connect succeeds, mark socket as connected. If 1273 * connect fails and socket is unbound, reset inp_vflag 1274 * field. 1275 */ 1276 if (error == 0) 1277 soisconnected(so); 1278 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1279 inp->inp_lport == 0) 1280 inp->inp_vflag = vflagsav; 1281 out: 1282 INP_WUNLOCK(inp); 1283 return (error); 1284 } 1285 1286 static void 1287 udp6_detach(struct socket *so) 1288 { 1289 struct inpcb *inp; 1290 struct inpcbinfo *pcbinfo; 1291 struct udpcb *up; 1292 1293 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1294 inp = sotoinpcb(so); 1295 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1296 1297 INP_INFO_WLOCK(pcbinfo); 1298 INP_WLOCK(inp); 1299 up = intoudpcb(inp); 1300 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1301 in_pcbdetach(inp); 1302 in_pcbfree(inp); 1303 INP_INFO_WUNLOCK(pcbinfo); 1304 udp_discardcb(up); 1305 } 1306 1307 static int 1308 udp6_disconnect(struct socket *so) 1309 { 1310 struct inpcb *inp; 1311 struct inpcbinfo *pcbinfo; 1312 1313 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1314 inp = sotoinpcb(so); 1315 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1316 1317 INP_WLOCK(inp); 1318 #ifdef INET 1319 if (inp->inp_vflag & INP_IPV4) { 1320 struct pr_usrreqs *pru; 1321 uint8_t nxt; 1322 1323 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1324 IPPROTO_UDP : IPPROTO_UDPLITE; 1325 INP_WUNLOCK(inp); 1326 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1327 (void)(*pru->pru_disconnect)(so); 1328 return (0); 1329 } 1330 #endif 1331 1332 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1333 INP_WUNLOCK(inp); 1334 return (ENOTCONN); 1335 } 1336 1337 INP_HASH_WLOCK(pcbinfo); 1338 in6_pcbdisconnect(inp); 1339 inp->in6p_laddr = in6addr_any; 1340 INP_HASH_WUNLOCK(pcbinfo); 1341 SOCK_LOCK(so); 1342 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1343 SOCK_UNLOCK(so); 1344 INP_WUNLOCK(inp); 1345 return (0); 1346 } 1347 1348 static int 1349 udp6_send(struct socket *so, int flags, struct mbuf *m, 1350 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1351 { 1352 int error; 1353 1354 if (addr) { 1355 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1356 error = EINVAL; 1357 goto bad; 1358 } 1359 if (addr->sa_family != AF_INET6) { 1360 error = EAFNOSUPPORT; 1361 goto bad; 1362 } 1363 } 1364 1365 return (udp6_output(so, flags, m, addr, control, td)); 1366 1367 bad: 1368 if (control) 1369 m_freem(control); 1370 m_freem(m); 1371 return (error); 1372 } 1373 1374 struct pr_usrreqs udp6_usrreqs = { 1375 .pru_abort = udp6_abort, 1376 .pru_attach = udp6_attach, 1377 .pru_bind = udp6_bind, 1378 .pru_connect = udp6_connect, 1379 .pru_control = in6_control, 1380 .pru_detach = udp6_detach, 1381 .pru_disconnect = udp6_disconnect, 1382 .pru_peeraddr = in6_mapped_peeraddr, 1383 .pru_send = udp6_send, 1384 .pru_shutdown = udp_shutdown, 1385 .pru_sockaddr = in6_mapped_sockaddr, 1386 .pru_soreceive = soreceive_dgram, 1387 .pru_sosend = sosend_dgram, 1388 .pru_sosetlabel = in_pcbsosetlabel, 1389 .pru_close = udp6_close 1390 }; 1391