udp6_usrreq.c revision 171609
1/* $FreeBSD: head/sys/netinet6/udp6_usrreq.c 171609 2007-07-27 08:25:02Z rwatson $ */ 2/* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */ 3/* $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ */ 4 5/*- 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34/*- 35 * Copyright (c) 1982, 1986, 1989, 1993 36 * The Regents of the University of California. 37 * All rights reserved. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 4. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 * 63 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 64 */ 65 66#include "opt_inet.h" 67#include "opt_inet6.h" 68#include "opt_ipsec.h" 69#include "opt_mac.h" 70 71#include <sys/param.h> 72#include <sys/errno.h> 73#include <sys/kernel.h> 74#include <sys/lock.h> 75#include <sys/mbuf.h> 76#include <sys/priv.h> 77#include <sys/proc.h> 78#include <sys/protosw.h> 79#include <sys/signalvar.h> 80#include <sys/socket.h> 81#include <sys/socketvar.h> 82#include <sys/stat.h> 83#include <sys/sx.h> 84#include <sys/sysctl.h> 85#include <sys/syslog.h> 86#include <sys/systm.h> 87 88#include <net/if.h> 89#include <net/if_types.h> 90#include <net/route.h> 91 92#include <netinet/in.h> 93#include <netinet/in_pcb.h> 94#include <netinet/in_systm.h> 95#include <netinet/in_var.h> 96#include <netinet/ip.h> 97#include <netinet/ip_icmp.h> 98#include <netinet/ip6.h> 99#include <netinet/icmp_var.h> 100#include <netinet/icmp6.h> 101#include <netinet/ip_var.h> 102#include <netinet/udp.h> 103#include <netinet/udp_var.h> 104#include <netinet6/ip6protosw.h> 105#include <netinet6/ip6_var.h> 106#include <netinet6/in6_pcb.h> 107#include <netinet6/udp6_var.h> 108#include <netinet6/scope6_var.h> 109 110#ifdef IPSEC 111#include <netipsec/ipsec.h> 112#include <netipsec/ipsec6.h> 113#endif /* IPSEC */ 114 115#include <security/mac/mac_framework.h> 116 117/* 118 * UDP protocol inplementation. 119 * Per RFC 768, August, 1980. 120 */ 121 122extern struct protosw inetsw[]; 123static void udp6_detach(struct socket *so); 124 125static void 126udp6_append(struct inpcb *in6p, struct mbuf *n, int off, 127 struct sockaddr_in6 *fromsa) 128{ 129 struct socket *so; 130 struct mbuf *opts; 131 132 INP_LOCK_ASSERT(in6p); 133 134#ifdef IPSEC 135 /* Check AH/ESP integrity. */ 136 if (ipsec6_in_reject(n, in6p)) { 137 m_freem(n); 138 ipsec6stat.in_polvio++; 139 return; 140 } 141#endif /* IPSEC */ 142#ifdef MAC 143 if (mac_check_inpcb_deliver(in6p, n) != 0) { 144 m_freem(n); 145 return; 146 } 147#endif 148 opts = NULL; 149 if (in6p->in6p_flags & IN6P_CONTROLOPTS || 150 in6p->inp_socket->so_options & SO_TIMESTAMP) 151 ip6_savecontrol(in6p, n, &opts); 152 m_adj(n, off + sizeof(struct udphdr)); 153 154 so = in6p->inp_socket; 155 SOCKBUF_LOCK(&so->so_rcv); 156 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 157 opts) == 0) { 158 SOCKBUF_UNLOCK(&so->so_rcv); 159 m_freem(n); 160 if (opts) 161 m_freem(opts); 162 udpstat.udps_fullsock++; 163 } else 164 sorwakeup_locked(so); 165} 166 167int 168udp6_input(struct mbuf **mp, int *offp, int proto) 169{ 170 struct mbuf *m = *mp; 171 struct ip6_hdr *ip6; 172 struct udphdr *uh; 173 struct inpcb *in6p; 174 int off = *offp; 175 int plen, ulen; 176 struct sockaddr_in6 fromsa; 177 178 ip6 = mtod(m, struct ip6_hdr *); 179 180 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 181 /* XXX send icmp6 host/port unreach? */ 182 m_freem(m); 183 return (IPPROTO_DONE); 184 } 185 186#ifndef PULLDOWN_TEST 187 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 188 ip6 = mtod(m, struct ip6_hdr *); 189 uh = (struct udphdr *)((caddr_t)ip6 + off); 190#else 191 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 192 if (!uh) 193 return (IPPROTO_DONE); 194#endif 195 196 udpstat.udps_ipackets++; 197 198 /* 199 * Destination port of 0 is illegal, based on RFC768. 200 */ 201 if (uh->uh_dport == 0) 202 goto badunlocked; 203 204 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 205 ulen = ntohs((u_short)uh->uh_ulen); 206 207 if (plen != ulen) { 208 udpstat.udps_badlen++; 209 goto badunlocked; 210 } 211 212 /* 213 * Checksum extended UDP header and data. 214 */ 215 if (uh->uh_sum == 0) { 216 udpstat.udps_nosum++; 217 goto badunlocked; 218 } 219 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 220 udpstat.udps_badsum++; 221 goto badunlocked; 222 } 223 224 /* 225 * Construct sockaddr format source address. 226 */ 227 init_sin6(&fromsa, m); 228 fromsa.sin6_port = uh->uh_sport; 229 230 INP_INFO_RLOCK(&udbinfo); 231 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 232 struct inpcb *last; 233 234 /* 235 * In the event that laddr should be set to the link-local 236 * address (this happens in RIPng), the multicast address 237 * specified in the received packet will not match laddr. To 238 * handle this situation, matching is relaxed if the 239 * receiving interface is the same as one specified in the 240 * socket and if the destination multicast address matches 241 * one of the multicast groups specified in the socket. 242 */ 243 244 /* 245 * KAME note: traditionally we dropped udpiphdr from mbuf 246 * here. We need udphdr for IPsec processing so we do that 247 * later. 248 */ 249 last = NULL; 250 LIST_FOREACH(in6p, &udb, inp_list) { 251 if ((in6p->inp_vflag & INP_IPV6) == 0) 252 continue; 253 if (in6p->in6p_lport != uh->uh_dport) 254 continue; 255 /* 256 * XXX: Do not check source port of incoming datagram 257 * unless inp_connect() has been called to bind the 258 * fport part of the 4-tuple; the source could be 259 * trying to talk to us with an ephemeral port. 260 */ 261 if (in6p->inp_fport != 0 && 262 in6p->inp_fport != uh->uh_sport) 263 continue; 264 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 265 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 266 &ip6->ip6_dst)) 267 continue; 268 } 269 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 270 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 271 &ip6->ip6_src) || 272 in6p->in6p_fport != uh->uh_sport) 273 continue; 274 } 275 276 if (last != NULL) { 277 struct mbuf *n; 278 279 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 280 INP_LOCK(last); 281 udp6_append(last, n, off, &fromsa); 282 INP_UNLOCK(last); 283 } 284 } 285 last = in6p; 286 /* 287 * Don't look for additional matches if this one does 288 * not have either the SO_REUSEPORT or SO_REUSEADDR 289 * socket options set. This heuristic avoids 290 * searching through all pcbs in the common case of a 291 * non-shared port. It assumes that an application 292 * will never clear these options after setting them. 293 */ 294 if ((last->in6p_socket->so_options & 295 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 296 break; 297 } 298 299 if (last == NULL) { 300 /* 301 * No matching pcb found; discard datagram. (No need 302 * to send an ICMP Port Unreachable for a broadcast 303 * or multicast datgram.) 304 */ 305 udpstat.udps_noport++; 306 udpstat.udps_noportmcast++; 307 goto badheadlocked; 308 } 309 INP_LOCK(last); 310 udp6_append(last, m, off, &fromsa); 311 INP_UNLOCK(last); 312 INP_INFO_RUNLOCK(&udbinfo); 313 return (IPPROTO_DONE); 314 } 315 /* 316 * Locate pcb for datagram. 317 */ 318 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 319 &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 320 if (in6p == NULL) { 321 if (udp_log_in_vain) { 322 char ip6bufs[INET6_ADDRSTRLEN]; 323 char ip6bufd[INET6_ADDRSTRLEN]; 324 325 log(LOG_INFO, 326 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 327 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 328 ntohs(uh->uh_dport), 329 ip6_sprintf(ip6bufs, &ip6->ip6_src), 330 ntohs(uh->uh_sport)); 331 } 332 udpstat.udps_noport++; 333 if (m->m_flags & M_MCAST) { 334 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 335 udpstat.udps_noportmcast++; 336 goto badheadlocked; 337 } 338 INP_INFO_RUNLOCK(&udbinfo); 339 if (udp_blackhole) 340 goto badunlocked; 341 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 342 goto badunlocked; 343 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 344 return (IPPROTO_DONE); 345 } 346 INP_LOCK(in6p); 347 udp6_append(in6p, m, off, &fromsa); 348 INP_UNLOCK(in6p); 349 INP_INFO_RUNLOCK(&udbinfo); 350 return (IPPROTO_DONE); 351 352badheadlocked: 353 INP_INFO_RUNLOCK(&udbinfo); 354badunlocked: 355 if (m) 356 m_freem(m); 357 return (IPPROTO_DONE); 358} 359 360void 361udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 362{ 363 struct udphdr uh; 364 struct ip6_hdr *ip6; 365 struct mbuf *m; 366 int off = 0; 367 struct ip6ctlparam *ip6cp = NULL; 368 const struct sockaddr_in6 *sa6_src = NULL; 369 void *cmdarg; 370 struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify; 371 struct udp_portonly { 372 u_int16_t uh_sport; 373 u_int16_t uh_dport; 374 } *uhp; 375 376 if (sa->sa_family != AF_INET6 || 377 sa->sa_len != sizeof(struct sockaddr_in6)) 378 return; 379 380 if ((unsigned)cmd >= PRC_NCMDS) 381 return; 382 if (PRC_IS_REDIRECT(cmd)) 383 notify = in6_rtchange, d = NULL; 384 else if (cmd == PRC_HOSTDEAD) 385 d = NULL; 386 else if (inet6ctlerrmap[cmd] == 0) 387 return; 388 389 /* if the parameter is from icmp6, decode it. */ 390 if (d != NULL) { 391 ip6cp = (struct ip6ctlparam *)d; 392 m = ip6cp->ip6c_m; 393 ip6 = ip6cp->ip6c_ip6; 394 off = ip6cp->ip6c_off; 395 cmdarg = ip6cp->ip6c_cmdarg; 396 sa6_src = ip6cp->ip6c_src; 397 } else { 398 m = NULL; 399 ip6 = NULL; 400 cmdarg = NULL; 401 sa6_src = &sa6_any; 402 } 403 404 if (ip6) { 405 /* 406 * XXX: We assume that when IPV6 is non NULL, 407 * M and OFF are valid. 408 */ 409 410 /* Check if we can safely examine src and dst ports. */ 411 if (m->m_pkthdr.len < off + sizeof(*uhp)) 412 return; 413 414 bzero(&uh, sizeof(uh)); 415 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 416 417 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport, 418 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 419 cmdarg, notify); 420 } else 421 (void) in6_pcbnotify(&udbinfo, sa, 0, 422 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 423} 424 425static int 426udp6_getcred(SYSCTL_HANDLER_ARGS) 427{ 428 struct xucred xuc; 429 struct sockaddr_in6 addrs[2]; 430 struct inpcb *inp; 431 int error; 432 433 error = priv_check(req->td, PRIV_NETINET_GETCRED); 434 if (error) 435 return (error); 436 437 if (req->newlen != sizeof(addrs)) 438 return (EINVAL); 439 if (req->oldlen != sizeof(struct xucred)) 440 return (EINVAL); 441 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 442 if (error) 443 return (error); 444 if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 || 445 (error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) { 446 return (error); 447 } 448 INP_INFO_RLOCK(&udbinfo); 449 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 450 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1, 451 NULL); 452 if (inp == NULL) { 453 INP_INFO_RUNLOCK(&udbinfo); 454 return (ENOENT); 455 } 456 INP_LOCK(inp); 457 if (inp->inp_socket == NULL) { 458 error = ENOENT; 459 goto out; 460 } 461 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket); 462 if (error) 463 goto out; 464 cru2x(inp->inp_socket->so_cred, &xuc); 465out: 466 INP_UNLOCK(inp); 467 INP_INFO_RUNLOCK(&udbinfo); 468 if (error == 0) 469 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 470 return (error); 471} 472 473SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 474 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 475 476#define in6pcb inpcb 477#define udp6stat udpstat 478#define udp6s_opackets udps_opackets 479 480static int 481udp6_output(struct in6pcb *in6p, struct mbuf *m, struct sockaddr *addr6, 482 struct mbuf *control, struct thread *td) 483{ 484 u_int32_t ulen = m->m_pkthdr.len; 485 u_int32_t plen = sizeof(struct udphdr) + ulen; 486 struct ip6_hdr *ip6; 487 struct udphdr *udp6; 488 struct in6_addr *laddr, *faddr; 489 struct sockaddr_in6 *sin6 = NULL; 490 struct ifnet *oifp = NULL; 491 int scope_ambiguous = 0; 492 u_short fport; 493 int error = 0; 494 struct ip6_pktopts *optp, opt; 495 int priv; 496 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 497 int flags; 498 struct sockaddr_in6 tmp; 499 500 INP_LOCK_ASSERT(in6p); 501 502 priv = 0; 503 if (td && !suser(td)) 504 priv = 1; 505 506 if (addr6) { 507 /* addr6 has been validated in udp6_send(). */ 508 sin6 = (struct sockaddr_in6 *)addr6; 509 510 /* protect *sin6 from overwrites */ 511 tmp = *sin6; 512 sin6 = &tmp; 513 514 /* 515 * Application should provide a proper zone ID or the use of 516 * default zone IDs should be enabled. Unfortunately, some 517 * applications do not behave as it should, so we need a 518 * workaround. Even if an appropriate ID is not determined, 519 * we'll see if we can determine the outgoing interface. If we 520 * can, determine the zone ID based on the interface below. 521 */ 522 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 523 scope_ambiguous = 1; 524 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 525 return (error); 526 } 527 528 if (control) { 529 if ((error = ip6_setpktopts(control, &opt, 530 in6p->in6p_outputopts, priv, IPPROTO_UDP)) != 0) 531 goto release; 532 optp = &opt; 533 } else 534 optp = in6p->in6p_outputopts; 535 536 if (sin6) { 537 faddr = &sin6->sin6_addr; 538 539 /* 540 * IPv4 version of udp_output calls in_pcbconnect in this case, 541 * which needs splnet and affects performance. 542 * Since we saw no essential reason for calling in_pcbconnect, 543 * we get rid of such kind of logic, and call in6_selectsrc 544 * and in6_pcbsetport in order to fill in the local address 545 * and the local port. 546 */ 547 if (sin6->sin6_port == 0) { 548 error = EADDRNOTAVAIL; 549 goto release; 550 } 551 552 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 553 /* how about ::ffff:0.0.0.0 case? */ 554 error = EISCONN; 555 goto release; 556 } 557 558 fport = sin6->sin6_port; /* allow 0 port */ 559 560 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 561 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) { 562 /* 563 * I believe we should explicitly discard the 564 * packet when mapped addresses are disabled, 565 * rather than send the packet as an IPv6 one. 566 * If we chose the latter approach, the packet 567 * might be sent out on the wire based on the 568 * default route, the situation which we'd 569 * probably want to avoid. 570 * (20010421 jinmei@kame.net) 571 */ 572 error = EINVAL; 573 goto release; 574 } 575 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 576 !IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) { 577 /* 578 * when remote addr is an IPv4-mapped address, 579 * local addr should not be an IPv6 address, 580 * since you cannot determine how to map IPv6 581 * source address to IPv4. 582 */ 583 error = EINVAL; 584 goto release; 585 } 586 587 af = AF_INET; 588 } 589 590 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 591 laddr = in6_selectsrc(sin6, optp, in6p->in6p_moptions, 592 NULL, &in6p->in6p_laddr, &oifp, &error); 593 if (oifp && scope_ambiguous && 594 (error = in6_setscope(&sin6->sin6_addr, 595 oifp, NULL))) { 596 goto release; 597 } 598 } else 599 laddr = &in6p->in6p_laddr; /* XXX */ 600 if (laddr == NULL) { 601 if (error == 0) 602 error = EADDRNOTAVAIL; 603 goto release; 604 } 605 if (in6p->in6p_lport == 0 && 606 (error = in6_pcbsetport(laddr, in6p, td->td_ucred)) != 0) 607 goto release; 608 } else { 609 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 610 error = ENOTCONN; 611 goto release; 612 } 613 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) { 614 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) { 615 /* 616 * XXX: this case would happen when the 617 * application sets the V6ONLY flag after 618 * connecting the foreign address. 619 * Such applications should be fixed, 620 * so we bark here. 621 */ 622 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 623 "option was set for a connected socket\n"); 624 error = EINVAL; 625 goto release; 626 } else 627 af = AF_INET; 628 } 629 laddr = &in6p->in6p_laddr; 630 faddr = &in6p->in6p_faddr; 631 fport = in6p->in6p_fport; 632 } 633 634 if (af == AF_INET) 635 hlen = sizeof(struct ip); 636 637 /* 638 * Calculate data length and get a mbuf 639 * for UDP and IP6 headers. 640 */ 641 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 642 if (m == 0) { 643 error = ENOBUFS; 644 goto release; 645 } 646 647 /* 648 * Stuff checksum and output datagram. 649 */ 650 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 651 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */ 652 udp6->uh_dport = fport; 653 if (plen <= 0xffff) 654 udp6->uh_ulen = htons((u_short)plen); 655 else 656 udp6->uh_ulen = 0; 657 udp6->uh_sum = 0; 658 659 switch (af) { 660 case AF_INET6: 661 ip6 = mtod(m, struct ip6_hdr *); 662 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK; 663 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 664 ip6->ip6_vfc |= IPV6_VERSION; 665#if 0 /* ip6_plen will be filled in ip6_output. */ 666 ip6->ip6_plen = htons((u_short)plen); 667#endif 668 ip6->ip6_nxt = IPPROTO_UDP; 669 ip6->ip6_hlim = in6_selecthlim(in6p, NULL); 670 ip6->ip6_src = *laddr; 671 ip6->ip6_dst = *faddr; 672 673 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP, 674 sizeof(struct ip6_hdr), plen)) == 0) { 675 udp6->uh_sum = 0xffff; 676 } 677 678 flags = 0; 679 680 udp6stat.udp6s_opackets++; 681 error = ip6_output(m, optp, NULL, flags, in6p->in6p_moptions, 682 NULL, in6p); 683 break; 684 case AF_INET: 685 error = EAFNOSUPPORT; 686 goto release; 687 } 688 goto releaseopt; 689 690release: 691 m_freem(m); 692 693releaseopt: 694 if (control) { 695 ip6_clearpktopts(&opt, -1); 696 m_freem(control); 697 } 698 return (error); 699} 700 701static void 702udp6_abort(struct socket *so) 703{ 704 struct inpcb *inp; 705 706 inp = sotoinpcb(so); 707 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 708 709#ifdef INET 710 if (inp->inp_vflag & INP_IPV4) { 711 struct pr_usrreqs *pru; 712 713 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 714 (*pru->pru_abort)(so); 715 return; 716 } 717#endif 718 719 INP_INFO_WLOCK(&udbinfo); 720 INP_LOCK(inp); 721 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 722 in6_pcbdisconnect(inp); 723 inp->in6p_laddr = in6addr_any; 724 soisdisconnected(so); 725 } 726 INP_UNLOCK(inp); 727 INP_INFO_WUNLOCK(&udbinfo); 728} 729 730static int 731udp6_attach(struct socket *so, int proto, struct thread *td) 732{ 733 struct inpcb *inp; 734 int error; 735 736 inp = sotoinpcb(so); 737 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 738 739 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 740 error = soreserve(so, udp_sendspace, udp_recvspace); 741 if (error) 742 return (error); 743 } 744 INP_INFO_WLOCK(&udbinfo); 745 error = in_pcballoc(so, &udbinfo); 746 if (error) { 747 INP_INFO_WUNLOCK(&udbinfo); 748 return (error); 749 } 750 inp = (struct inpcb *)so->so_pcb; 751 INP_INFO_WUNLOCK(&udbinfo); 752 inp->inp_vflag |= INP_IPV6; 753 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 754 inp->inp_vflag |= INP_IPV4; 755 inp->in6p_hops = -1; /* use kernel default */ 756 inp->in6p_cksum = -1; /* just to be sure */ 757 /* 758 * XXX: ugly!! 759 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 760 * because the socket may be bound to an IPv6 wildcard address, 761 * which may match an IPv4-mapped IPv6 address. 762 */ 763 inp->inp_ip_ttl = ip_defttl; 764 INP_UNLOCK(inp); 765 return (0); 766} 767 768static int 769udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 770{ 771 struct inpcb *inp; 772 int error; 773 774 inp = sotoinpcb(so); 775 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 776 777 INP_INFO_WLOCK(&udbinfo); 778 INP_LOCK(inp); 779 inp->inp_vflag &= ~INP_IPV4; 780 inp->inp_vflag |= INP_IPV6; 781 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 782 struct sockaddr_in6 *sin6_p; 783 784 sin6_p = (struct sockaddr_in6 *)nam; 785 786 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 787 inp->inp_vflag |= INP_IPV4; 788 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 789 struct sockaddr_in sin; 790 791 in6_sin6_2_sin(&sin, sin6_p); 792 inp->inp_vflag |= INP_IPV4; 793 inp->inp_vflag &= ~INP_IPV6; 794 error = in_pcbbind(inp, (struct sockaddr *)&sin, 795 td->td_ucred); 796 goto out; 797 } 798 } 799 800 error = in6_pcbbind(inp, nam, td->td_ucred); 801out: 802 INP_UNLOCK(inp); 803 INP_INFO_WUNLOCK(&udbinfo); 804 return (error); 805} 806 807static void 808udp6_close(struct socket *so) 809{ 810 struct inpcb *inp; 811 812 inp = sotoinpcb(so); 813 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 814 815#ifdef INET 816 if (inp->inp_vflag & INP_IPV4) { 817 struct pr_usrreqs *pru; 818 819 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 820 (*pru->pru_disconnect)(so); 821 return; 822 } 823#endif 824 INP_INFO_WLOCK(&udbinfo); 825 INP_LOCK(inp); 826 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 827 in6_pcbdisconnect(inp); 828 inp->in6p_laddr = in6addr_any; 829 soisdisconnected(so); 830 } 831 INP_UNLOCK(inp); 832 INP_INFO_WUNLOCK(&udbinfo); 833} 834 835static int 836udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 837{ 838 struct inpcb *inp; 839 int error; 840 841 inp = sotoinpcb(so); 842 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 843 844 INP_INFO_WLOCK(&udbinfo); 845 INP_LOCK(inp); 846 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 847 struct sockaddr_in6 *sin6_p; 848 849 sin6_p = (struct sockaddr_in6 *)nam; 850 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 851 struct sockaddr_in sin; 852 853 if (inp->inp_faddr.s_addr != INADDR_ANY) { 854 error = EISCONN; 855 goto out; 856 } 857 in6_sin6_2_sin(&sin, sin6_p); 858 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 859 td->td_ucred); 860 if (error == 0) { 861 inp->inp_vflag |= INP_IPV4; 862 inp->inp_vflag &= ~INP_IPV6; 863 soisconnected(so); 864 } 865 goto out; 866 } 867 } 868 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 869 error = EISCONN; 870 goto out; 871 } 872 error = in6_pcbconnect(inp, nam, td->td_ucred); 873 if (error == 0) { 874 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 875 /* should be non mapped addr */ 876 inp->inp_vflag &= ~INP_IPV4; 877 inp->inp_vflag |= INP_IPV6; 878 } 879 soisconnected(so); 880 } 881out: 882 INP_UNLOCK(inp); 883 INP_INFO_WUNLOCK(&udbinfo); 884 return (error); 885} 886 887static void 888udp6_detach(struct socket *so) 889{ 890 struct inpcb *inp; 891 892 inp = sotoinpcb(so); 893 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 894 895 INP_INFO_WLOCK(&udbinfo); 896 INP_LOCK(inp); 897 in6_pcbdetach(inp); 898 in6_pcbfree(inp); 899 INP_INFO_WUNLOCK(&udbinfo); 900} 901 902static int 903udp6_disconnect(struct socket *so) 904{ 905 struct inpcb *inp; 906 int error; 907 908 inp = sotoinpcb(so); 909 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 910 911 INP_INFO_WLOCK(&udbinfo); 912 INP_LOCK(inp); 913 914#ifdef INET 915 if (inp->inp_vflag & INP_IPV4) { 916 struct pr_usrreqs *pru; 917 918 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 919 error = (*pru->pru_disconnect)(so); 920 goto out; 921 } 922#endif 923 924 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 925 error = ENOTCONN; 926 goto out; 927 } 928 929 in6_pcbdisconnect(inp); 930 inp->in6p_laddr = in6addr_any; 931 /* XXXRW: so_state locking? */ 932 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 933out: 934 INP_UNLOCK(inp); 935 INP_INFO_WUNLOCK(&udbinfo); 936 return (0); 937} 938 939static int 940udp6_send(struct socket *so, int flags, struct mbuf *m, 941 struct sockaddr *addr, struct mbuf *control, struct thread *td) 942{ 943 struct inpcb *inp; 944 int error = 0; 945 946 inp = sotoinpcb(so); 947 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 948 949 INP_INFO_WLOCK(&udbinfo); 950 INP_LOCK(inp); 951 if (addr) { 952 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 953 error = EINVAL; 954 goto bad; 955 } 956 if (addr->sa_family != AF_INET6) { 957 error = EAFNOSUPPORT; 958 goto bad; 959 } 960 } 961 962#ifdef INET 963 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 964 int hasv4addr; 965 struct sockaddr_in6 *sin6 = 0; 966 967 if (addr == 0) 968 hasv4addr = (inp->inp_vflag & INP_IPV4); 969 else { 970 sin6 = (struct sockaddr_in6 *)addr; 971 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 972 ? 1 : 0; 973 } 974 if (hasv4addr) { 975 struct pr_usrreqs *pru; 976 977 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 978 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 979 /* 980 * When remote addr is IPv4-mapped address, 981 * local addr should not be an IPv6 address; 982 * since you cannot determine how to map IPv6 983 * source address to IPv4. 984 */ 985 error = EINVAL; 986 goto out; 987 } 988 if (sin6) 989 in6_sin6_2_sin_in_sock(addr); 990 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 991 error = ((*pru->pru_send)(so, flags, m, addr, control, 992 td)); 993 /* addr will just be freed in sendit(). */ 994 goto out; 995 } 996 } 997#endif 998#ifdef MAC 999 mac_create_mbuf_from_inpcb(inp, m); 1000#endif 1001 error = udp6_output(inp, m, addr, control, td); 1002out: 1003 INP_UNLOCK(inp); 1004 INP_INFO_WUNLOCK(&udbinfo); 1005 return (error); 1006 1007bad: 1008 INP_UNLOCK(inp); 1009 INP_INFO_WUNLOCK(&udbinfo); 1010 m_freem(m); 1011 return (error); 1012} 1013 1014struct pr_usrreqs udp6_usrreqs = { 1015 .pru_abort = udp6_abort, 1016 .pru_attach = udp6_attach, 1017 .pru_bind = udp6_bind, 1018 .pru_connect = udp6_connect, 1019 .pru_control = in6_control, 1020 .pru_detach = udp6_detach, 1021 .pru_disconnect = udp6_disconnect, 1022 .pru_peeraddr = in6_mapped_peeraddr, 1023 .pru_send = udp6_send, 1024 .pru_shutdown = udp_shutdown, 1025 .pru_sockaddr = in6_mapped_sockaddr, 1026 .pru_sosetlabel = in_pcbsosetlabel, 1027 .pru_close = udp6_close 1028}; 1029