udp6_usrreq.c revision 1.130
1/* $NetBSD: udp6_usrreq.c,v 1.130 2017/07/06 17:08:57 christos 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 1.130 2017/07/06 17:08:57 christos Exp $"); 66 67#ifdef _KERNEL_OPT 68#include "opt_inet.h" 69#include "opt_inet_csum.h" 70#include "opt_ipsec.h" 71#include "opt_net_mpsafe.h" 72#endif 73 74#include <sys/param.h> 75#include <sys/mbuf.h> 76#include <sys/protosw.h> 77#include <sys/socket.h> 78#include <sys/socketvar.h> 79#include <sys/systm.h> 80#include <sys/proc.h> 81#include <sys/syslog.h> 82#include <sys/domain.h> 83#include <sys/sysctl.h> 84 85#include <net/if.h> 86#include <net/if_types.h> 87 88#include <netinet/in.h> 89#include <netinet/in_var.h> 90#include <netinet/in_systm.h> 91#include <netinet/in_offload.h> 92#include <netinet/ip.h> 93#include <netinet/ip_var.h> 94#include <netinet/in_pcb.h> 95#include <netinet/udp.h> 96#include <netinet/udp_var.h> 97#include <netinet/udp_private.h> 98 99#include <netinet/ip6.h> 100#include <netinet/icmp6.h> 101#include <netinet6/ip6_var.h> 102#include <netinet6/ip6_private.h> 103#include <netinet6/in6_pcb.h> 104#include <netinet6/udp6_var.h> 105#include <netinet6/udp6_private.h> 106#include <netinet6/ip6protosw.h> 107#include <netinet6/scope6_var.h> 108 109#ifdef IPSEC 110#include <netipsec/ipsec.h> 111#include <netipsec/ipsec_var.h> 112#include <netipsec/ipsec_private.h> 113#ifdef INET6 114#include <netipsec/ipsec6.h> 115#endif 116#endif /* IPSEC */ 117 118#include "faith.h" 119#if defined(NFAITH) && NFAITH > 0 120#include <net/if_faith.h> 121#endif 122 123/* 124 * UDP protocol implementation. 125 * Per RFC 768, August, 1980. 126 */ 127 128extern struct inpcbtable udbtable; 129 130percpu_t *udp6stat_percpu; 131 132/* UDP on IP6 parameters */ 133static int udp6_sendspace = 9216; /* really max datagram size */ 134static int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6)); 135 /* 40 1K datagrams */ 136 137static void udp6_notify(struct in6pcb *, int); 138static void sysctl_net_inet6_udp6_setup(struct sysctllog **); 139 140#ifdef UDP_CSUM_COUNTERS 141#include <sys/device.h> 142struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 143 NULL, "udp6", "hwcsum bad"); 144struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 145 NULL, "udp6", "hwcsum ok"); 146struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 147 NULL, "udp6", "hwcsum data"); 148struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 149 NULL, "udp6", "swcsum"); 150 151EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 152EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 153EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 154EVCNT_ATTACH_STATIC(udp6_swcsum); 155 156#define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 157#else 158#define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 159#endif 160 161void 162udp6_init(void) 163{ 164 sysctl_net_inet6_udp6_setup(NULL); 165 udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS); 166 167 udp_init_common(); 168} 169 170/* 171 * Notify a udp user of an asynchronous error; 172 * just wake up so that he can collect error status. 173 */ 174static void 175udp6_notify(struct in6pcb *in6p, int errno) 176{ 177 in6p->in6p_socket->so_error = errno; 178 sorwakeup(in6p->in6p_socket); 179 sowwakeup(in6p->in6p_socket); 180} 181 182void * 183udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 184{ 185 struct udphdr uh; 186 struct ip6_hdr *ip6; 187 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 188 struct mbuf *m; 189 int off; 190 void *cmdarg; 191 struct ip6ctlparam *ip6cp = NULL; 192 const struct sockaddr_in6 *sa6_src = NULL; 193 void (*notify)(struct in6pcb *, int) = udp6_notify; 194 struct udp_portonly { 195 u_int16_t uh_sport; 196 u_int16_t uh_dport; 197 } *uhp; 198 199 if (sa->sa_family != AF_INET6 || 200 sa->sa_len != sizeof(struct sockaddr_in6)) 201 return NULL; 202 203 if ((unsigned)cmd >= PRC_NCMDS) 204 return NULL; 205 if (PRC_IS_REDIRECT(cmd)) 206 notify = in6_rtchange, d = NULL; 207 else if (cmd == PRC_HOSTDEAD) 208 d = NULL; 209 else if (cmd == PRC_MSGSIZE) { 210 /* special code is present, see below */ 211 notify = in6_rtchange; 212 } 213 else if (inet6ctlerrmap[cmd] == 0) 214 return NULL; 215 216 /* if the parameter is from icmp6, decode it. */ 217 if (d != NULL) { 218 ip6cp = (struct ip6ctlparam *)d; 219 m = ip6cp->ip6c_m; 220 ip6 = ip6cp->ip6c_ip6; 221 off = ip6cp->ip6c_off; 222 cmdarg = ip6cp->ip6c_cmdarg; 223 sa6_src = ip6cp->ip6c_src; 224 } else { 225 m = NULL; 226 ip6 = NULL; 227 cmdarg = NULL; 228 sa6_src = &sa6_any; 229 off = 0; 230 } 231 232 if (ip6) { 233 /* 234 * XXX: We assume that when IPV6 is non NULL, 235 * M and OFF are valid. 236 */ 237 238 /* check if we can safely examine src and dst ports */ 239 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 240 if (cmd == PRC_MSGSIZE) 241 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 242 return NULL; 243 } 244 245 memset(&uh, 0, sizeof(uh)); 246 m_copydata(m, off, sizeof(*uhp), (void *)&uh); 247 248 if (cmd == PRC_MSGSIZE) { 249 int valid = 0; 250 251 /* 252 * Check to see if we have a valid UDP socket 253 * corresponding to the address in the ICMPv6 message 254 * payload. 255 */ 256 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr, 257 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, 258 uh.uh_sport, 0, 0)) 259 valid++; 260#if 0 261 /* 262 * As the use of sendto(2) is fairly popular, 263 * we may want to allow non-connected pcb too. 264 * But it could be too weak against attacks... 265 * We should at least check if the local address (= s) 266 * is really ours. 267 */ 268 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr, 269 uh.uh_dport, 0)) 270 valid++; 271#endif 272 273 /* 274 * Depending on the value of "valid" and routing table 275 * size (mtudisc_{hi,lo}wat), we will: 276 * - recalculate the new MTU and create the 277 * corresponding routing entry, or 278 * - ignore the MTU change notification. 279 */ 280 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 281 282 /* 283 * regardless of if we called 284 * icmp6_mtudisc_update(), we need to call 285 * in6_pcbnotify(), to notify path MTU change 286 * to the userland (RFC3542), because some 287 * unconnected sockets may share the same 288 * destination and want to know the path MTU. 289 */ 290 } 291 292 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, 293 sin6tocsa(sa6_src), uh.uh_sport, cmd, cmdarg, 294 notify); 295 } else { 296 (void) in6_pcbnotify(&udbtable, sa, 0, 297 sin6tocsa(sa6_src), 0, cmd, cmdarg, notify); 298 } 299 return NULL; 300} 301 302int 303udp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 304{ 305 int s; 306 int error = 0; 307 int family; 308 309 family = so->so_proto->pr_domain->dom_family; 310 311 s = splsoftnet(); 312 switch (family) { 313#ifdef INET 314 case PF_INET: 315 if (sopt->sopt_level != IPPROTO_UDP) { 316 error = ip_ctloutput(op, so, sopt); 317 goto end; 318 } 319 break; 320#endif 321#ifdef INET6 322 case PF_INET6: 323 if (sopt->sopt_level != IPPROTO_UDP) { 324 error = ip6_ctloutput(op, so, sopt); 325 goto end; 326 } 327 break; 328#endif 329 default: 330 error = EAFNOSUPPORT; 331 goto end; 332 } 333 error = EINVAL; 334 335end: 336 splx(s); 337 return error; 338} 339 340static void 341udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 342 struct sockaddr *src, struct socket *so) 343{ 344 struct mbuf *opts = NULL; 345 struct mbuf *n; 346 struct in6pcb *in6p; 347 348 KASSERT(so != NULL); 349 KASSERT(so->so_proto->pr_domain->dom_family == AF_INET6); 350 in6p = sotoin6pcb(so); 351 KASSERT(in6p != NULL); 352 353#if defined(IPSEC) 354 /* check AH/ESP integrity. */ 355 if (ipsec_used && ipsec6_in_reject(m, in6p)) { 356 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 357 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 358 icmp6_error(n, ICMP6_DST_UNREACH, 359 ICMP6_DST_UNREACH_ADMIN, 0); 360 return; 361 } 362#endif /*IPSEC*/ 363 364 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 365 if (in6p->in6p_flags & IN6P_CONTROLOPTS 366 || SOOPT_TIMESTAMP(in6p->in6p_socket->so_options)) { 367 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 368 ip6_savecontrol(in6p, &opts, ip6, n); 369 } 370 371 m_adj(n, off); 372 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 373 m_freem(n); 374 if (opts) 375 m_freem(opts); 376 so->so_rcv.sb_overflowed++; 377 UDP6_STATINC(UDP6_STAT_FULLSOCK); 378 } else 379 sorwakeup(so); 380 } 381} 382 383int 384udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 385 struct mbuf *m, int off) 386{ 387 u_int16_t sport, dport; 388 int rcvcnt; 389 struct in6_addr src6, *dst6; 390 const struct in_addr *dst4; 391 struct inpcb_hdr *inph; 392 struct in6pcb *in6p; 393 394 rcvcnt = 0; 395 off += sizeof(struct udphdr); /* now, offset of payload */ 396 397 if (af != AF_INET && af != AF_INET6) 398 goto bad; 399 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 400 goto bad; 401 402 src6 = src->sin6_addr; 403 if (sa6_recoverscope(src) != 0) { 404 /* XXX: should be impossible. */ 405 goto bad; 406 } 407 sport = src->sin6_port; 408 409 dport = dst->sin6_port; 410 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 411 dst6 = &dst->sin6_addr; 412 413 if (IN6_IS_ADDR_MULTICAST(dst6) || 414 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 415 /* 416 * Deliver a multicast or broadcast datagram to *all* sockets 417 * for which the local and remote addresses and ports match 418 * those of the incoming datagram. This allows more than 419 * one process to receive multi/broadcasts on the same port. 420 * (This really ought to be done for unicast datagrams as 421 * well, but that would cause problems with existing 422 * applications that open both address-specific sockets and 423 * a wildcard socket listening to the same port -- they would 424 * end up receiving duplicates of every unicast datagram. 425 * Those applications open the multiple sockets to overcome an 426 * inadequacy of the UDP socket interface, but for backwards 427 * compatibility we avoid the problem here rather than 428 * fixing the interface. Maybe 4.5BSD will remedy this?) 429 */ 430 431 /* 432 * KAME note: traditionally we dropped udpiphdr from mbuf here. 433 * we need udpiphdr for IPsec processing so we do that later. 434 */ 435 /* 436 * Locate pcb(s) for datagram. 437 */ 438 TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 439 in6p = (struct in6pcb *)inph; 440 if (in6p->in6p_af != AF_INET6) 441 continue; 442 443 if (in6p->in6p_lport != dport) 444 continue; 445 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 446 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 447 dst6)) 448 continue; 449 } else { 450 if (IN6_IS_ADDR_V4MAPPED(dst6) && 451 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 452 continue; 453 } 454 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 455 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 456 &src6) || in6p->in6p_fport != sport) 457 continue; 458 } else { 459 if (IN6_IS_ADDR_V4MAPPED(&src6) && 460 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 461 continue; 462 } 463 464 udp6_sendup(m, off, sin6tosa(src), in6p->in6p_socket); 465 rcvcnt++; 466 467 /* 468 * Don't look for additional matches if this one does 469 * not have either the SO_REUSEPORT or SO_REUSEADDR 470 * socket options set. This heuristic avoids searching 471 * through all pcbs in the common case of a non-shared 472 * port. It assumes that an application will never 473 * clear these options after setting them. 474 */ 475 if ((in6p->in6p_socket->so_options & 476 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 477 break; 478 } 479 } else { 480 /* 481 * Locate pcb for datagram. 482 */ 483 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 484 dport, 0, 0); 485 if (in6p == 0) { 486 UDP_STATINC(UDP_STAT_PCBHASHMISS); 487 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 488 if (in6p == 0) 489 return rcvcnt; 490 } 491 492 udp6_sendup(m, off, sin6tosa(src), in6p->in6p_socket); 493 rcvcnt++; 494 } 495 496bad: 497 return rcvcnt; 498} 499 500int 501udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 502{ 503 504 /* 505 * XXX it's better to record and check if this mbuf is 506 * already checked. 507 */ 508 509 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 510 goto good; 511 } 512 if (uh->uh_sum == 0) { 513 UDP6_STATINC(UDP6_STAT_NOSUM); 514 goto bad; 515 } 516 517 switch (m->m_pkthdr.csum_flags & 518 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_UDPv6) | 519 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 520 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 521 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 522 UDP6_STATINC(UDP6_STAT_BADSUM); 523 goto bad; 524 525#if 0 /* notyet */ 526 case M_CSUM_UDPv6|M_CSUM_DATA: 527#endif 528 529 case M_CSUM_UDPv6: 530 /* Checksum was okay. */ 531 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 532 break; 533 534 default: 535 /* 536 * Need to compute it ourselves. Maybe skip checksum 537 * on loopback interfaces. 538 */ 539 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 540 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 541 UDP6_STATINC(UDP6_STAT_BADSUM); 542 goto bad; 543 } 544 } 545 546good: 547 return 0; 548bad: 549 return -1; 550} 551 552int 553udp6_input(struct mbuf **mp, int *offp, int proto) 554{ 555 struct mbuf *m = *mp; 556 int off = *offp; 557 struct sockaddr_in6 src, dst; 558 struct ip6_hdr *ip6; 559 struct udphdr *uh; 560 u_int32_t plen, ulen; 561 562 ip6 = mtod(m, struct ip6_hdr *); 563 564#if defined(NFAITH) && 0 < NFAITH 565 if (faithprefix(&ip6->ip6_dst)) { 566 /* send icmp6 host unreach? */ 567 m_freem(m); 568 return IPPROTO_DONE; 569 } 570#endif 571 572 UDP6_STATINC(UDP6_STAT_IPACKETS); 573 574 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 575 plen = m->m_pkthdr.len - off; 576 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 577 if (uh == NULL) { 578 IP6_STATINC(IP6_STAT_TOOSHORT); 579 return IPPROTO_DONE; 580 } 581 /* 582 * Enforce alignment requirements that are violated in 583 * some cases, see kern/50766 for details. 584 */ 585 if (UDP_HDR_ALIGNED_P(uh) == 0) { 586 m = m_copyup(m, off + sizeof(struct udphdr), 0); 587 if (m == NULL) { 588 IP6_STATINC(IP6_STAT_TOOSHORT); 589 return IPPROTO_DONE; 590 } 591 ip6 = mtod(m, struct ip6_hdr *); 592 uh = (struct udphdr *)(mtod(m, char *) + off); 593 } 594 KASSERT(UDP_HDR_ALIGNED_P(uh)); 595 ulen = ntohs((u_short)uh->uh_ulen); 596 /* 597 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 598 * iff payload length > 0xffff. 599 */ 600 if (ulen == 0 && plen > 0xffff) 601 ulen = plen; 602 603 if (plen != ulen) { 604 UDP6_STATINC(UDP6_STAT_BADLEN); 605 goto bad; 606 } 607 608 /* destination port of 0 is illegal, based on RFC768. */ 609 if (uh->uh_dport == 0) 610 goto bad; 611 612 /* Be proactive about malicious use of IPv4 mapped address */ 613 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 614 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 615 /* XXX stat */ 616 goto bad; 617 } 618 619 /* 620 * Checksum extended UDP header and data. Maybe skip checksum 621 * on loopback interfaces. 622 */ 623 if (udp6_input_checksum(m, uh, off, ulen)) 624 goto bad; 625 626 /* 627 * Construct source and dst sockaddrs. 628 */ 629 memset(&src, 0, sizeof(src)); 630 src.sin6_family = AF_INET6; 631 src.sin6_len = sizeof(struct sockaddr_in6); 632 src.sin6_addr = ip6->ip6_src; 633 src.sin6_port = uh->uh_sport; 634 memset(&dst, 0, sizeof(dst)); 635 dst.sin6_family = AF_INET6; 636 dst.sin6_len = sizeof(struct sockaddr_in6); 637 dst.sin6_addr = ip6->ip6_dst; 638 dst.sin6_port = uh->uh_dport; 639 640 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 641 if (m->m_flags & M_MCAST) { 642 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 643 goto bad; 644 } 645 UDP6_STATINC(UDP6_STAT_NOPORT); 646 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 647 m = NULL; 648 } 649 650bad: 651 if (m) 652 m_freem(m); 653 return IPPROTO_DONE; 654} 655 656static int 657udp6_attach(struct socket *so, int proto) 658{ 659 struct in6pcb *in6p; 660 int s, error; 661 662 KASSERT(sotoin6pcb(so) == NULL); 663 sosetlock(so); 664 665 /* 666 * MAPPED_ADDR implementation spec: 667 * Always attach for IPv6, and only when necessary for IPv4. 668 */ 669 s = splsoftnet(); 670 error = in6_pcballoc(so, &udbtable); 671 splx(s); 672 if (error) { 673 return error; 674 } 675 error = soreserve(so, udp6_sendspace, udp6_recvspace); 676 if (error) { 677 return error; 678 } 679 in6p = sotoin6pcb(so); 680 in6p->in6p_cksum = -1; /* just to be sure */ 681 682 KASSERT(solocked(so)); 683 return 0; 684} 685 686static void 687udp6_detach(struct socket *so) 688{ 689 struct in6pcb *in6p = sotoin6pcb(so); 690 int s; 691 692 KASSERT(solocked(so)); 693 KASSERT(in6p != NULL); 694 695 s = splsoftnet(); 696 in6_pcbdetach(in6p); 697 splx(s); 698} 699 700static int 701udp6_accept(struct socket *so, struct sockaddr *nam) 702{ 703 KASSERT(solocked(so)); 704 705 return EOPNOTSUPP; 706} 707 708static int 709udp6_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) 710{ 711 struct in6pcb *in6p = sotoin6pcb(so); 712 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 713 int error = 0; 714 int s; 715 716 KASSERT(solocked(so)); 717 KASSERT(in6p != NULL); 718 719 s = splsoftnet(); 720 error = in6_pcbbind(in6p, sin6, l); 721 splx(s); 722 return error; 723} 724 725static int 726udp6_listen(struct socket *so, struct lwp *l) 727{ 728 KASSERT(solocked(so)); 729 730 return EOPNOTSUPP; 731} 732 733static int 734udp6_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) 735{ 736 struct in6pcb *in6p = sotoin6pcb(so); 737 int error = 0; 738 int s; 739 740 KASSERT(solocked(so)); 741 KASSERT(in6p != NULL); 742 743 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 744 return EISCONN; 745 s = splsoftnet(); 746 error = in6_pcbconnect(in6p, (struct sockaddr_in6 *)nam, l); 747 splx(s); 748 if (error == 0) 749 soisconnected(so); 750 751 return error; 752} 753 754static int 755udp6_connect2(struct socket *so, struct socket *so2) 756{ 757 KASSERT(solocked(so)); 758 759 return EOPNOTSUPP; 760} 761 762static int 763udp6_disconnect(struct socket *so) 764{ 765 struct in6pcb *in6p = sotoin6pcb(so); 766 int s; 767 768 KASSERT(solocked(so)); 769 KASSERT(in6p != NULL); 770 771 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 772 return ENOTCONN; 773 774 s = splsoftnet(); 775 in6_pcbdisconnect(in6p); 776 memset((void *)&in6p->in6p_laddr, 0, sizeof(in6p->in6p_laddr)); 777 splx(s); 778 779 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 780 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 781 return 0; 782} 783 784static int 785udp6_shutdown(struct socket *so) 786{ 787 int s; 788 789 s = splsoftnet(); 790 socantsendmore(so); 791 splx(s); 792 793 return 0; 794} 795 796static int 797udp6_abort(struct socket *so) 798{ 799 int s; 800 801 KASSERT(solocked(so)); 802 KASSERT(sotoin6pcb(so) != NULL); 803 804 s = splsoftnet(); 805 soisdisconnected(so); 806 in6_pcbdetach(sotoin6pcb(so)); 807 splx(s); 808 809 return 0; 810} 811 812static int 813udp6_ioctl(struct socket *so, u_long cmd, void *addr6, struct ifnet *ifp) 814{ 815 /* 816 * MAPPED_ADDR implementation info: 817 * Mapped addr support for PRU_CONTROL is not necessary. 818 * Because typical user of PRU_CONTROL is such as ifconfig, 819 * and they don't associate any addr to their socket. Then 820 * socket family is only hint about the PRU_CONTROL'ed address 821 * family, especially when getting addrs from kernel. 822 * So AF_INET socket need to be used to control AF_INET addrs, 823 * and AF_INET6 socket for AF_INET6 addrs. 824 */ 825 return in6_control(so, cmd, addr6, ifp); 826} 827 828static int 829udp6_stat(struct socket *so, struct stat *ub) 830{ 831 KASSERT(solocked(so)); 832 833 /* stat: don't bother with a blocksize */ 834 return 0; 835} 836 837static int 838udp6_peeraddr(struct socket *so, struct sockaddr *nam) 839{ 840 KASSERT(solocked(so)); 841 KASSERT(sotoin6pcb(so) != NULL); 842 KASSERT(nam != NULL); 843 844 in6_setpeeraddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam); 845 return 0; 846} 847 848static int 849udp6_sockaddr(struct socket *so, struct sockaddr *nam) 850{ 851 KASSERT(solocked(so)); 852 KASSERT(sotoin6pcb(so) != NULL); 853 KASSERT(nam != NULL); 854 855 in6_setsockaddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam); 856 return 0; 857} 858 859static int 860udp6_rcvd(struct socket *so, int flags, struct lwp *l) 861{ 862 KASSERT(solocked(so)); 863 864 return EOPNOTSUPP; 865} 866 867static int 868udp6_recvoob(struct socket *so, struct mbuf *m, int flags) 869{ 870 KASSERT(solocked(so)); 871 872 return EOPNOTSUPP; 873} 874 875static int 876udp6_send(struct socket *so, struct mbuf *m, struct sockaddr *nam, 877 struct mbuf *control, struct lwp *l) 878{ 879 struct in6pcb *in6p = sotoin6pcb(so); 880 int error = 0; 881 int s; 882 883 KASSERT(solocked(so)); 884 KASSERT(in6p != NULL); 885 KASSERT(m != NULL); 886 887 s = splsoftnet(); 888 error = udp6_output(in6p, m, (struct sockaddr_in6 *)nam, control, l); 889 splx(s); 890 891 return error; 892} 893 894static int 895udp6_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) 896{ 897 KASSERT(solocked(so)); 898 899 if (m) 900 m_freem(m); 901 if (control) 902 m_freem(control); 903 904 return EOPNOTSUPP; 905} 906 907static int 908udp6_purgeif(struct socket *so, struct ifnet *ifp) 909{ 910 911 mutex_enter(softnet_lock); 912 in6_pcbpurgeif0(&udbtable, ifp); 913#ifdef NET_MPSAFE 914 mutex_exit(softnet_lock); 915#endif 916 in6_purgeif(ifp); 917#ifdef NET_MPSAFE 918 mutex_enter(softnet_lock); 919#endif 920 in6_pcbpurgeif(&udbtable, ifp); 921 mutex_exit(softnet_lock); 922 923 return 0; 924} 925 926static int 927sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 928{ 929 930 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 931} 932 933static void 934sysctl_net_inet6_udp6_setup(struct sysctllog **clog) 935{ 936 937 sysctl_createv(clog, 0, NULL, NULL, 938 CTLFLAG_PERMANENT, 939 CTLTYPE_NODE, "inet6", NULL, 940 NULL, 0, NULL, 0, 941 CTL_NET, PF_INET6, CTL_EOL); 942 sysctl_createv(clog, 0, NULL, NULL, 943 CTLFLAG_PERMANENT, 944 CTLTYPE_NODE, "udp6", 945 SYSCTL_DESCR("UDPv6 related settings"), 946 NULL, 0, NULL, 0, 947 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 948 949 sysctl_createv(clog, 0, NULL, NULL, 950 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 951 CTLTYPE_INT, "sendspace", 952 SYSCTL_DESCR("Default UDP send buffer size"), 953 NULL, 0, &udp6_sendspace, 0, 954 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 955 CTL_EOL); 956 sysctl_createv(clog, 0, NULL, NULL, 957 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 958 CTLTYPE_INT, "recvspace", 959 SYSCTL_DESCR("Default UDP receive buffer size"), 960 NULL, 0, &udp6_recvspace, 0, 961 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 962 CTL_EOL); 963 sysctl_createv(clog, 0, NULL, NULL, 964 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 965 CTLTYPE_INT, "do_loopback_cksum", 966 SYSCTL_DESCR("Perform UDP checksum on loopback"), 967 NULL, 0, &udp_do_loopback_cksum, 0, 968 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 969 CTL_EOL); 970 sysctl_createv(clog, 0, NULL, NULL, 971 CTLFLAG_PERMANENT, 972 CTLTYPE_STRUCT, "pcblist", 973 SYSCTL_DESCR("UDP protocol control block list"), 974 sysctl_inpcblist, 0, &udbtable, 0, 975 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 976 CTL_EOL); 977 sysctl_createv(clog, 0, NULL, NULL, 978 CTLFLAG_PERMANENT, 979 CTLTYPE_STRUCT, "stats", 980 SYSCTL_DESCR("UDPv6 statistics"), 981 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 982 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 983 CTL_EOL); 984} 985 986void 987udp6_statinc(u_int stat) 988{ 989 990 KASSERT(stat < UDP6_NSTATS); 991 UDP6_STATINC(stat); 992} 993 994PR_WRAP_USRREQS(udp6) 995#define udp6_attach udp6_attach_wrapper 996#define udp6_detach udp6_detach_wrapper 997#define udp6_accept udp6_accept_wrapper 998#define udp6_bind udp6_bind_wrapper 999#define udp6_listen udp6_listen_wrapper 1000#define udp6_connect udp6_connect_wrapper 1001#define udp6_connect2 udp6_connect2_wrapper 1002#define udp6_disconnect udp6_disconnect_wrapper 1003#define udp6_shutdown udp6_shutdown_wrapper 1004#define udp6_abort udp6_abort_wrapper 1005#define udp6_ioctl udp6_ioctl_wrapper 1006#define udp6_stat udp6_stat_wrapper 1007#define udp6_peeraddr udp6_peeraddr_wrapper 1008#define udp6_sockaddr udp6_sockaddr_wrapper 1009#define udp6_rcvd udp6_rcvd_wrapper 1010#define udp6_recvoob udp6_recvoob_wrapper 1011#define udp6_send udp6_send_wrapper 1012#define udp6_sendoob udp6_sendoob_wrapper 1013#define udp6_purgeif udp6_purgeif_wrapper 1014 1015const struct pr_usrreqs udp6_usrreqs = { 1016 .pr_attach = udp6_attach, 1017 .pr_detach = udp6_detach, 1018 .pr_accept = udp6_accept, 1019 .pr_bind = udp6_bind, 1020 .pr_listen = udp6_listen, 1021 .pr_connect = udp6_connect, 1022 .pr_connect2 = udp6_connect2, 1023 .pr_disconnect = udp6_disconnect, 1024 .pr_shutdown = udp6_shutdown, 1025 .pr_abort = udp6_abort, 1026 .pr_ioctl = udp6_ioctl, 1027 .pr_stat = udp6_stat, 1028 .pr_peeraddr = udp6_peeraddr, 1029 .pr_sockaddr = udp6_sockaddr, 1030 .pr_rcvd = udp6_rcvd, 1031 .pr_recvoob = udp6_recvoob, 1032 .pr_send = udp6_send, 1033 .pr_sendoob = udp6_sendoob, 1034 .pr_purgeif = udp6_purgeif, 1035}; 1036