udp6_usrreq.c revision 1.107
1/* $NetBSD: udp6_usrreq.c,v 1.107 2014/07/09 14:41:42 rtr Exp $ */ 2/* $KAME: udp6_usrreq.c,v 1.86 2001/05/27 17:33:00 itojun Exp $ */ 3 4/* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * Copyright (c) 1982, 1986, 1989, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 62 */ 63 64#include <sys/cdefs.h> 65__KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.107 2014/07/09 14:41:42 rtr Exp $"); 66 67#include "opt_inet.h" 68#include "opt_inet_csum.h" 69 70#include <sys/param.h> 71#include <sys/mbuf.h> 72#include <sys/protosw.h> 73#include <sys/socket.h> 74#include <sys/socketvar.h> 75#include <sys/systm.h> 76#include <sys/proc.h> 77#include <sys/syslog.h> 78#include <sys/domain.h> 79#include <sys/sysctl.h> 80 81#include <net/if.h> 82#include <net/route.h> 83#include <net/if_types.h> 84 85#include <netinet/in.h> 86#include <netinet/in_var.h> 87#include <netinet/in_systm.h> 88#include <netinet/in_offload.h> 89#include <netinet/ip.h> 90#include <netinet/ip_var.h> 91#include <netinet/in_pcb.h> 92#include <netinet/udp.h> 93#include <netinet/udp_var.h> 94#include <netinet/udp_private.h> 95 96#include <netinet/ip6.h> 97#include <netinet/icmp6.h> 98#include <netinet6/ip6_var.h> 99#include <netinet6/ip6_private.h> 100#include <netinet6/in6_pcb.h> 101#include <netinet6/udp6_var.h> 102#include <netinet6/udp6_private.h> 103#include <netinet6/ip6protosw.h> 104#include <netinet6/scope6_var.h> 105 106#include "faith.h" 107#if defined(NFAITH) && NFAITH > 0 108#include <net/if_faith.h> 109#endif 110 111/* 112 * UDP protocol implementation. 113 * Per RFC 768, August, 1980. 114 */ 115 116extern struct inpcbtable udbtable; 117 118percpu_t *udp6stat_percpu; 119 120/* UDP on IP6 parameters */ 121static int udp6_sendspace = 9216; /* really max datagram size */ 122static int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6)); 123 /* 40 1K datagrams */ 124 125static void udp6_notify(struct in6pcb *, int); 126static void sysctl_net_inet6_udp6_setup(struct sysctllog **); 127 128#ifdef UDP_CSUM_COUNTERS 129#include <sys/device.h> 130struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 131 NULL, "udp6", "hwcsum bad"); 132struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 133 NULL, "udp6", "hwcsum ok"); 134struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 135 NULL, "udp6", "hwcsum data"); 136struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 137 NULL, "udp6", "swcsum"); 138 139EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 140EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 141EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 142EVCNT_ATTACH_STATIC(udp6_swcsum); 143 144#define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 145#else 146#define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 147#endif 148 149void 150udp6_init(void) 151{ 152 sysctl_net_inet6_udp6_setup(NULL); 153 udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS); 154 155 udp_init_common(); 156} 157 158/* 159 * Notify a udp user of an asynchronous error; 160 * just wake up so that he can collect error status. 161 */ 162static void 163udp6_notify(struct in6pcb *in6p, int errno) 164{ 165 in6p->in6p_socket->so_error = errno; 166 sorwakeup(in6p->in6p_socket); 167 sowwakeup(in6p->in6p_socket); 168} 169 170void * 171udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 172{ 173 struct udphdr uh; 174 struct ip6_hdr *ip6; 175 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 176 struct mbuf *m; 177 int off; 178 void *cmdarg; 179 struct ip6ctlparam *ip6cp = NULL; 180 const struct sockaddr_in6 *sa6_src = NULL; 181 void (*notify)(struct in6pcb *, int) = udp6_notify; 182 struct udp_portonly { 183 u_int16_t uh_sport; 184 u_int16_t uh_dport; 185 } *uhp; 186 187 if (sa->sa_family != AF_INET6 || 188 sa->sa_len != sizeof(struct sockaddr_in6)) 189 return NULL; 190 191 if ((unsigned)cmd >= PRC_NCMDS) 192 return NULL; 193 if (PRC_IS_REDIRECT(cmd)) 194 notify = in6_rtchange, d = NULL; 195 else if (cmd == PRC_HOSTDEAD) 196 d = NULL; 197 else if (cmd == PRC_MSGSIZE) { 198 /* special code is present, see below */ 199 notify = in6_rtchange; 200 } 201 else if (inet6ctlerrmap[cmd] == 0) 202 return NULL; 203 204 /* if the parameter is from icmp6, decode it. */ 205 if (d != NULL) { 206 ip6cp = (struct ip6ctlparam *)d; 207 m = ip6cp->ip6c_m; 208 ip6 = ip6cp->ip6c_ip6; 209 off = ip6cp->ip6c_off; 210 cmdarg = ip6cp->ip6c_cmdarg; 211 sa6_src = ip6cp->ip6c_src; 212 } else { 213 m = NULL; 214 ip6 = NULL; 215 cmdarg = NULL; 216 sa6_src = &sa6_any; 217 off = 0; 218 } 219 220 if (ip6) { 221 /* 222 * XXX: We assume that when IPV6 is non NULL, 223 * M and OFF are valid. 224 */ 225 226 /* check if we can safely examine src and dst ports */ 227 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 228 if (cmd == PRC_MSGSIZE) 229 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 230 return NULL; 231 } 232 233 memset(&uh, 0, sizeof(uh)); 234 m_copydata(m, off, sizeof(*uhp), (void *)&uh); 235 236 if (cmd == PRC_MSGSIZE) { 237 int valid = 0; 238 239 /* 240 * Check to see if we have a valid UDP socket 241 * corresponding to the address in the ICMPv6 message 242 * payload. 243 */ 244 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr, 245 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, 246 uh.uh_sport, 0, 0)) 247 valid++; 248#if 0 249 /* 250 * As the use of sendto(2) is fairly popular, 251 * we may want to allow non-connected pcb too. 252 * But it could be too weak against attacks... 253 * We should at least check if the local address (= s) 254 * is really ours. 255 */ 256 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr, 257 uh.uh_dport, 0)) 258 valid++; 259#endif 260 261 /* 262 * Depending on the value of "valid" and routing table 263 * size (mtudisc_{hi,lo}wat), we will: 264 * - recalculate the new MTU and create the 265 * corresponding routing entry, or 266 * - ignore the MTU change notification. 267 */ 268 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 269 270 /* 271 * regardless of if we called 272 * icmp6_mtudisc_update(), we need to call 273 * in6_pcbnotify(), to notify path MTU change 274 * to the userland (RFC3542), because some 275 * unconnected sockets may share the same 276 * destination and want to know the path MTU. 277 */ 278 } 279 280 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, 281 (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 282 notify); 283 } else { 284 (void) in6_pcbnotify(&udbtable, sa, 0, 285 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 286 } 287 return NULL; 288} 289 290int 291udp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 292{ 293 int s; 294 int error = 0; 295 int family; 296 297 family = so->so_proto->pr_domain->dom_family; 298 299 s = splsoftnet(); 300 switch (family) { 301#ifdef INET 302 case PF_INET: 303 if (sopt->sopt_level != IPPROTO_UDP) { 304 error = ip_ctloutput(op, so, sopt); 305 goto end; 306 } 307 break; 308#endif 309#ifdef INET6 310 case PF_INET6: 311 if (sopt->sopt_level != IPPROTO_UDP) { 312 error = ip6_ctloutput(op, so, sopt); 313 goto end; 314 } 315 break; 316#endif 317 default: 318 error = EAFNOSUPPORT; 319 goto end; 320 } 321 error = EINVAL; 322 323end: 324 splx(s); 325 return error; 326} 327 328static void 329udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 330 struct sockaddr *src, struct socket *so) 331{ 332 struct mbuf *opts = NULL; 333 struct mbuf *n; 334 struct in6pcb *in6p = NULL; 335 336 if (!so) 337 return; 338 if (so->so_proto->pr_domain->dom_family != AF_INET6) 339 return; 340 in6p = sotoin6pcb(so); 341 342#if defined(IPSEC) 343 /* check AH/ESP integrity. */ 344 if (ipsec_used && so != NULL && ipsec6_in_reject_so(m, so)) { 345 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 346 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 347 icmp6_error(n, ICMP6_DST_UNREACH, 348 ICMP6_DST_UNREACH_ADMIN, 0); 349 return; 350 } 351#endif /*IPSEC*/ 352 353 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 354 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 355#ifdef SO_OTIMESTAMP 356 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 357#endif 358 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 359 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 360 ip6_savecontrol(in6p, &opts, ip6, n); 361 } 362 363 m_adj(n, off); 364 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 365 m_freem(n); 366 if (opts) 367 m_freem(opts); 368 so->so_rcv.sb_overflowed++; 369 UDP6_STATINC(UDP6_STAT_FULLSOCK); 370 } else 371 sorwakeup(so); 372 } 373} 374 375int 376udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 377 struct mbuf *m, int off) 378{ 379 u_int16_t sport, dport; 380 int rcvcnt; 381 struct in6_addr src6, *dst6; 382 const struct in_addr *dst4; 383 struct inpcb_hdr *inph; 384 struct in6pcb *in6p; 385 386 rcvcnt = 0; 387 off += sizeof(struct udphdr); /* now, offset of payload */ 388 389 if (af != AF_INET && af != AF_INET6) 390 goto bad; 391 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 392 goto bad; 393 394 src6 = src->sin6_addr; 395 if (sa6_recoverscope(src) != 0) { 396 /* XXX: should be impossible. */ 397 goto bad; 398 } 399 sport = src->sin6_port; 400 401 dport = dst->sin6_port; 402 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 403 dst6 = &dst->sin6_addr; 404 405 if (IN6_IS_ADDR_MULTICAST(dst6) || 406 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 407 /* 408 * Deliver a multicast or broadcast datagram to *all* sockets 409 * for which the local and remote addresses and ports match 410 * those of the incoming datagram. This allows more than 411 * one process to receive multi/broadcasts on the same port. 412 * (This really ought to be done for unicast datagrams as 413 * well, but that would cause problems with existing 414 * applications that open both address-specific sockets and 415 * a wildcard socket listening to the same port -- they would 416 * end up receiving duplicates of every unicast datagram. 417 * Those applications open the multiple sockets to overcome an 418 * inadequacy of the UDP socket interface, but for backwards 419 * compatibility we avoid the problem here rather than 420 * fixing the interface. Maybe 4.5BSD will remedy this?) 421 */ 422 423 /* 424 * KAME note: traditionally we dropped udpiphdr from mbuf here. 425 * we need udpiphdr for IPsec processing so we do that later. 426 */ 427 /* 428 * Locate pcb(s) for datagram. 429 */ 430 TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 431 in6p = (struct in6pcb *)inph; 432 if (in6p->in6p_af != AF_INET6) 433 continue; 434 435 if (in6p->in6p_lport != dport) 436 continue; 437 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 438 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 439 dst6)) 440 continue; 441 } else { 442 if (IN6_IS_ADDR_V4MAPPED(dst6) && 443 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 444 continue; 445 } 446 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 447 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 448 &src6) || in6p->in6p_fport != sport) 449 continue; 450 } else { 451 if (IN6_IS_ADDR_V4MAPPED(&src6) && 452 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 453 continue; 454 } 455 456 udp6_sendup(m, off, (struct sockaddr *)src, 457 in6p->in6p_socket); 458 rcvcnt++; 459 460 /* 461 * Don't look for additional matches if this one does 462 * not have either the SO_REUSEPORT or SO_REUSEADDR 463 * socket options set. This heuristic avoids searching 464 * through all pcbs in the common case of a non-shared 465 * port. It assumes that an application will never 466 * clear these options after setting them. 467 */ 468 if ((in6p->in6p_socket->so_options & 469 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 470 break; 471 } 472 } else { 473 /* 474 * Locate pcb for datagram. 475 */ 476 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 477 dport, 0, 0); 478 if (in6p == 0) { 479 UDP_STATINC(UDP_STAT_PCBHASHMISS); 480 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 481 if (in6p == 0) 482 return rcvcnt; 483 } 484 485 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 486 rcvcnt++; 487 } 488 489bad: 490 return rcvcnt; 491} 492 493int 494udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 495{ 496 497 /* 498 * XXX it's better to record and check if this mbuf is 499 * already checked. 500 */ 501 502 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 503 goto good; 504 } 505 if (uh->uh_sum == 0) { 506 UDP6_STATINC(UDP6_STAT_NOSUM); 507 goto bad; 508 } 509 510 switch (m->m_pkthdr.csum_flags & 511 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 512 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 513 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 514 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 515 UDP6_STATINC(UDP6_STAT_BADSUM); 516 goto bad; 517 518#if 0 /* notyet */ 519 case M_CSUM_UDPv6|M_CSUM_DATA: 520#endif 521 522 case M_CSUM_UDPv6: 523 /* Checksum was okay. */ 524 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 525 break; 526 527 default: 528 /* 529 * Need to compute it ourselves. Maybe skip checksum 530 * on loopback interfaces. 531 */ 532 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 533 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 534 UDP6_STATINC(UDP6_STAT_BADSUM); 535 goto bad; 536 } 537 } 538 539good: 540 return 0; 541bad: 542 return -1; 543} 544 545int 546udp6_input(struct mbuf **mp, int *offp, int proto) 547{ 548 struct mbuf *m = *mp; 549 int off = *offp; 550 struct sockaddr_in6 src, dst; 551 struct ip6_hdr *ip6; 552 struct udphdr *uh; 553 u_int32_t plen, ulen; 554 555 ip6 = mtod(m, struct ip6_hdr *); 556 557#if defined(NFAITH) && 0 < NFAITH 558 if (faithprefix(&ip6->ip6_dst)) { 559 /* send icmp6 host unreach? */ 560 m_freem(m); 561 return IPPROTO_DONE; 562 } 563#endif 564 565 UDP6_STATINC(UDP6_STAT_IPACKETS); 566 567 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 568 plen = m->m_pkthdr.len - off; 569 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 570 if (uh == NULL) { 571 IP6_STATINC(IP6_STAT_TOOSHORT); 572 return IPPROTO_DONE; 573 } 574 KASSERT(UDP_HDR_ALIGNED_P(uh)); 575 ulen = ntohs((u_short)uh->uh_ulen); 576 /* 577 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 578 * iff payload length > 0xffff. 579 */ 580 if (ulen == 0 && plen > 0xffff) 581 ulen = plen; 582 583 if (plen != ulen) { 584 UDP6_STATINC(UDP6_STAT_BADLEN); 585 goto bad; 586 } 587 588 /* destination port of 0 is illegal, based on RFC768. */ 589 if (uh->uh_dport == 0) 590 goto bad; 591 592 /* Be proactive about malicious use of IPv4 mapped address */ 593 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 594 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 595 /* XXX stat */ 596 goto bad; 597 } 598 599 /* 600 * Checksum extended UDP header and data. Maybe skip checksum 601 * on loopback interfaces. 602 */ 603 if (udp6_input_checksum(m, uh, off, ulen)) 604 goto bad; 605 606 /* 607 * Construct source and dst sockaddrs. 608 */ 609 memset(&src, 0, sizeof(src)); 610 src.sin6_family = AF_INET6; 611 src.sin6_len = sizeof(struct sockaddr_in6); 612 src.sin6_addr = ip6->ip6_src; 613 src.sin6_port = uh->uh_sport; 614 memset(&dst, 0, sizeof(dst)); 615 dst.sin6_family = AF_INET6; 616 dst.sin6_len = sizeof(struct sockaddr_in6); 617 dst.sin6_addr = ip6->ip6_dst; 618 dst.sin6_port = uh->uh_dport; 619 620 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 621 if (m->m_flags & M_MCAST) { 622 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 623 goto bad; 624 } 625 UDP6_STATINC(UDP6_STAT_NOPORT); 626 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 627 m = NULL; 628 } 629 630bad: 631 if (m) 632 m_freem(m); 633 return IPPROTO_DONE; 634} 635 636static int 637udp6_attach(struct socket *so, int proto) 638{ 639 struct in6pcb *in6p; 640 int s, error; 641 642 KASSERT(sotoin6pcb(so) == NULL); 643 sosetlock(so); 644 645 /* 646 * MAPPED_ADDR implementation spec: 647 * Always attach for IPv6, and only when necessary for IPv4. 648 */ 649 s = splsoftnet(); 650 error = in6_pcballoc(so, &udbtable); 651 splx(s); 652 if (error) { 653 return error; 654 } 655 error = soreserve(so, udp6_sendspace, udp6_recvspace); 656 if (error) { 657 return error; 658 } 659 in6p = sotoin6pcb(so); 660 in6p->in6p_cksum = -1; /* just to be sure */ 661 662 KASSERT(solocked(so)); 663 return 0; 664} 665 666static void 667udp6_detach(struct socket *so) 668{ 669 struct in6pcb *in6p = sotoin6pcb(so); 670 int s; 671 672 KASSERT(solocked(so)); 673 KASSERT(in6p != NULL); 674 675 s = splsoftnet(); 676 in6_pcbdetach(in6p); 677 splx(s); 678} 679 680static int 681udp6_accept(struct socket *so, struct mbuf *nam) 682{ 683 KASSERT(solocked(so)); 684 685 return EOPNOTSUPP; 686} 687 688static int 689udp6_ioctl(struct socket *so, u_long cmd, void *addr6, struct ifnet *ifp) 690{ 691 /* 692 * MAPPED_ADDR implementation info: 693 * Mapped addr support for PRU_CONTROL is not necessary. 694 * Because typical user of PRU_CONTROL is such as ifconfig, 695 * and they don't associate any addr to their socket. Then 696 * socket family is only hint about the PRU_CONTROL'ed address 697 * family, especially when getting addrs from kernel. 698 * So AF_INET socket need to be used to control AF_INET addrs, 699 * and AF_INET6 socket for AF_INET6 addrs. 700 */ 701 return in6_control(so, cmd, addr6, ifp); 702} 703 704static int 705udp6_stat(struct socket *so, struct stat *ub) 706{ 707 KASSERT(solocked(so)); 708 709 /* stat: don't bother with a blocksize */ 710 return 0; 711} 712 713static int 714udp6_peeraddr(struct socket *so, struct mbuf *nam) 715{ 716 KASSERT(solocked(so)); 717 KASSERT(sotoin6pcb(so) != NULL); 718 KASSERT(nam != NULL); 719 720 in6_setpeeraddr(sotoin6pcb(so), nam); 721 return 0; 722} 723 724static int 725udp6_sockaddr(struct socket *so, struct mbuf *nam) 726{ 727 KASSERT(solocked(so)); 728 KASSERT(sotoin6pcb(so) != NULL); 729 KASSERT(nam != NULL); 730 731 in6_setsockaddr(sotoin6pcb(so), nam); 732 return 0; 733} 734 735int 736udp6_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr6, 737 struct mbuf *control, struct lwp *l) 738{ 739 struct in6pcb *in6p = sotoin6pcb(so); 740 int s, error = 0; 741 742 KASSERT(req != PRU_ATTACH); 743 KASSERT(req != PRU_DETACH); 744 KASSERT(req != PRU_ACCEPT); 745 KASSERT(req != PRU_CONTROL); 746 KASSERT(req != PRU_SENSE); 747 KASSERT(req != PRU_PEERADDR); 748 KASSERT(req != PRU_SOCKADDR); 749 750 if (req == PRU_PURGEIF) { 751 mutex_enter(softnet_lock); 752 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control); 753 in6_purgeif((struct ifnet *)control); 754 in6_pcbpurgeif(&udbtable, (struct ifnet *)control); 755 mutex_exit(softnet_lock); 756 return 0; 757 } 758 if (in6p == NULL) { 759 error = EINVAL; 760 goto release; 761 } 762 763 switch (req) { 764 765 case PRU_BIND: 766 s = splsoftnet(); 767 error = in6_pcbbind(in6p, addr6, l); 768 splx(s); 769 break; 770 771 case PRU_CONNECT: 772 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 773 error = EISCONN; 774 break; 775 } 776 s = splsoftnet(); 777 error = in6_pcbconnect(in6p, addr6, l); 778 splx(s); 779 if (error == 0) 780 soisconnected(so); 781 break; 782 783 case PRU_DISCONNECT: 784 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 785 error = ENOTCONN; 786 break; 787 } 788 s = splsoftnet(); 789 in6_pcbdisconnect(in6p); 790 memset((void *)&in6p->in6p_laddr, 0, sizeof(in6p->in6p_laddr)); 791 splx(s); 792 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 793 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 794 break; 795 796 case PRU_SHUTDOWN: 797 socantsendmore(so); 798 break; 799 800 case PRU_SEND: 801 s = splsoftnet(); 802 error = udp6_output(in6p, m, addr6, control, l); 803 splx(s); 804 return error; 805 806 case PRU_ABORT: 807 soisdisconnected(so); 808 in6_pcbdetach(in6p); 809 break; 810 811 case PRU_LISTEN: 812 case PRU_CONNECT2: 813 case PRU_SENDOOB: 814 case PRU_FASTTIMO: 815 case PRU_SLOWTIMO: 816 case PRU_PROTORCV: 817 case PRU_PROTOSEND: 818 error = EOPNOTSUPP; 819 break; 820 821 case PRU_RCVD: 822 case PRU_RCVOOB: 823 return EOPNOTSUPP; /* do not free mbuf's */ 824 825 default: 826 panic("udp6_usrreq"); 827 } 828 829release: 830 if (control != NULL) 831 m_freem(control); 832 if (m != NULL) 833 m_freem(m); 834 return error; 835} 836 837static int 838sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 839{ 840 841 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 842} 843 844static void 845sysctl_net_inet6_udp6_setup(struct sysctllog **clog) 846{ 847 848 sysctl_createv(clog, 0, NULL, NULL, 849 CTLFLAG_PERMANENT, 850 CTLTYPE_NODE, "inet6", NULL, 851 NULL, 0, NULL, 0, 852 CTL_NET, PF_INET6, CTL_EOL); 853 sysctl_createv(clog, 0, NULL, NULL, 854 CTLFLAG_PERMANENT, 855 CTLTYPE_NODE, "udp6", 856 SYSCTL_DESCR("UDPv6 related settings"), 857 NULL, 0, NULL, 0, 858 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 859 860 sysctl_createv(clog, 0, NULL, NULL, 861 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 862 CTLTYPE_INT, "sendspace", 863 SYSCTL_DESCR("Default UDP send buffer size"), 864 NULL, 0, &udp6_sendspace, 0, 865 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 866 CTL_EOL); 867 sysctl_createv(clog, 0, NULL, NULL, 868 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 869 CTLTYPE_INT, "recvspace", 870 SYSCTL_DESCR("Default UDP receive buffer size"), 871 NULL, 0, &udp6_recvspace, 0, 872 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 873 CTL_EOL); 874 sysctl_createv(clog, 0, NULL, NULL, 875 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 876 CTLTYPE_INT, "do_loopback_cksum", 877 SYSCTL_DESCR("Perform UDP checksum on loopback"), 878 NULL, 0, &udp_do_loopback_cksum, 0, 879 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 880 CTL_EOL); 881 sysctl_createv(clog, 0, NULL, NULL, 882 CTLFLAG_PERMANENT, 883 CTLTYPE_STRUCT, "pcblist", 884 SYSCTL_DESCR("UDP protocol control block list"), 885 sysctl_inpcblist, 0, &udbtable, 0, 886 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 887 CTL_EOL); 888 sysctl_createv(clog, 0, NULL, NULL, 889 CTLFLAG_PERMANENT, 890 CTLTYPE_STRUCT, "stats", 891 SYSCTL_DESCR("UDPv6 statistics"), 892 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 893 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 894 CTL_EOL); 895} 896 897void 898udp6_statinc(u_int stat) 899{ 900 901 KASSERT(stat < UDP6_NSTATS); 902 UDP6_STATINC(stat); 903} 904 905PR_WRAP_USRREQS(udp6) 906#define udp6_attach udp6_attach_wrapper 907#define udp6_detach udp6_detach_wrapper 908#define udp6_accept udp6_accept_wrapper 909#define udp6_ioctl udp6_ioctl_wrapper 910#define udp6_stat udp6_stat_wrapper 911#define udp6_peeraddr udp6_peeraddr_wrapper 912#define udp6_sockaddr udp6_sockaddr_wrapper 913#define udp6_usrreq udp6_usrreq_wrapper 914 915const struct pr_usrreqs udp6_usrreqs = { 916 .pr_attach = udp6_attach, 917 .pr_detach = udp6_detach, 918 .pr_accept = udp6_accept, 919 .pr_ioctl = udp6_ioctl, 920 .pr_stat = udp6_stat, 921 .pr_peeraddr = udp6_peeraddr, 922 .pr_sockaddr = udp6_sockaddr, 923 .pr_generic = udp6_usrreq, 924}; 925