udp6_usrreq.c revision 1.115.4.3
1 /* $NetBSD: udp6_usrreq.c,v 1.115.4.3 2015/09/22 12:06:11 skrll 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 1.115.4.3 2015/09/22 12:06:11 skrll Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_inet.h" 69 #include "opt_inet_csum.h" 70 #include "opt_ipsec.h" 71 #endif 72 73 #include <sys/param.h> 74 #include <sys/mbuf.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/systm.h> 79 #include <sys/proc.h> 80 #include <sys/syslog.h> 81 #include <sys/domain.h> 82 #include <sys/sysctl.h> 83 84 #include <net/if.h> 85 #include <net/route.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 */ 127 128 extern struct inpcbtable udbtable; 129 130 percpu_t *udp6stat_percpu; 131 132 /* UDP on IP6 parameters */ 133 static int udp6_sendspace = 9216; /* really max datagram size */ 134 static int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6)); 135 /* 40 1K datagrams */ 136 137 static void udp6_notify(struct in6pcb *, int); 138 static void sysctl_net_inet6_udp6_setup(struct sysctllog **); 139 140 #ifdef UDP_CSUM_COUNTERS 141 #include <sys/device.h> 142 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 143 NULL, "udp6", "hwcsum bad"); 144 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 145 NULL, "udp6", "hwcsum ok"); 146 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 147 NULL, "udp6", "hwcsum data"); 148 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 149 NULL, "udp6", "swcsum"); 150 151 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 152 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 153 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 154 EVCNT_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 160 161 void 162 udp6_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 */ 174 static void 175 udp6_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 } 181 182 void * 183 udp6_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 (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 294 notify); 295 } else { 296 (void) in6_pcbnotify(&udbtable, sa, 0, 297 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 298 } 299 return NULL; 300 } 301 302 int 303 udp6_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; 334 335 end: 336 splx(s); 337 return error; 338 } 339 340 static void 341 udp6_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 = NULL; 347 348 if (!so) 349 return; 350 if (so->so_proto->pr_domain->dom_family != AF_INET6) 351 return; 352 in6p = sotoin6pcb(so); 353 354 #if defined(IPSEC) 355 /* check AH/ESP integrity. */ 356 if (ipsec_used && so != NULL && ipsec6_in_reject_so(m, so)) { 357 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 358 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 359 icmp6_error(n, ICMP6_DST_UNREACH, 360 ICMP6_DST_UNREACH_ADMIN, 0); 361 return; 362 } 363 #endif /*IPSEC*/ 364 365 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 366 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 367 #ifdef SO_OTIMESTAMP 368 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 369 #endif 370 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 371 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 372 ip6_savecontrol(in6p, &opts, ip6, n); 373 } 374 375 m_adj(n, off); 376 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 377 m_freem(n); 378 if (opts) 379 m_freem(opts); 380 so->so_rcv.sb_overflowed++; 381 UDP6_STATINC(UDP6_STAT_FULLSOCK); 382 } else 383 sorwakeup(so); 384 } 385 } 386 387 int 388 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 389 struct mbuf *m, int off) 390 { 391 u_int16_t sport, dport; 392 int rcvcnt; 393 struct in6_addr src6, *dst6; 394 const struct in_addr *dst4; 395 struct inpcb_hdr *inph; 396 struct in6pcb *in6p; 397 398 rcvcnt = 0; 399 off += sizeof(struct udphdr); /* now, offset of payload */ 400 401 if (af != AF_INET && af != AF_INET6) 402 goto bad; 403 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 404 goto bad; 405 406 src6 = src->sin6_addr; 407 if (sa6_recoverscope(src) != 0) { 408 /* XXX: should be impossible. */ 409 goto bad; 410 } 411 sport = src->sin6_port; 412 413 dport = dst->sin6_port; 414 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 415 dst6 = &dst->sin6_addr; 416 417 if (IN6_IS_ADDR_MULTICAST(dst6) || 418 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 419 /* 420 * Deliver a multicast or broadcast datagram to *all* sockets 421 * for which the local and remote addresses and ports match 422 * those of the incoming datagram. This allows more than 423 * one process to receive multi/broadcasts on the same port. 424 * (This really ought to be done for unicast datagrams as 425 * well, but that would cause problems with existing 426 * applications that open both address-specific sockets and 427 * a wildcard socket listening to the same port -- they would 428 * end up receiving duplicates of every unicast datagram. 429 * Those applications open the multiple sockets to overcome an 430 * inadequacy of the UDP socket interface, but for backwards 431 * compatibility we avoid the problem here rather than 432 * fixing the interface. Maybe 4.5BSD will remedy this?) 433 */ 434 435 /* 436 * KAME note: traditionally we dropped udpiphdr from mbuf here. 437 * we need udpiphdr for IPsec processing so we do that later. 438 */ 439 /* 440 * Locate pcb(s) for datagram. 441 */ 442 TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 443 in6p = (struct in6pcb *)inph; 444 if (in6p->in6p_af != AF_INET6) 445 continue; 446 447 if (in6p->in6p_lport != dport) 448 continue; 449 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 450 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 451 dst6)) 452 continue; 453 } else { 454 if (IN6_IS_ADDR_V4MAPPED(dst6) && 455 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 456 continue; 457 } 458 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 459 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 460 &src6) || in6p->in6p_fport != sport) 461 continue; 462 } else { 463 if (IN6_IS_ADDR_V4MAPPED(&src6) && 464 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 465 continue; 466 } 467 468 udp6_sendup(m, off, (struct sockaddr *)src, 469 in6p->in6p_socket); 470 rcvcnt++; 471 472 /* 473 * Don't look for additional matches if this one does 474 * not have either the SO_REUSEPORT or SO_REUSEADDR 475 * socket options set. This heuristic avoids searching 476 * through all pcbs in the common case of a non-shared 477 * port. It assumes that an application will never 478 * clear these options after setting them. 479 */ 480 if ((in6p->in6p_socket->so_options & 481 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 482 break; 483 } 484 } else { 485 /* 486 * Locate pcb for datagram. 487 */ 488 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 489 dport, 0, 0); 490 if (in6p == 0) { 491 UDP_STATINC(UDP_STAT_PCBHASHMISS); 492 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 493 if (in6p == 0) 494 return rcvcnt; 495 } 496 497 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 498 rcvcnt++; 499 } 500 501 bad: 502 return rcvcnt; 503 } 504 505 int 506 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 507 { 508 509 /* 510 * XXX it's better to record and check if this mbuf is 511 * already checked. 512 */ 513 514 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 515 goto good; 516 } 517 if (uh->uh_sum == 0) { 518 UDP6_STATINC(UDP6_STAT_NOSUM); 519 goto bad; 520 } 521 522 switch (m->m_pkthdr.csum_flags & 523 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 524 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 525 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 526 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 527 UDP6_STATINC(UDP6_STAT_BADSUM); 528 goto bad; 529 530 #if 0 /* notyet */ 531 case M_CSUM_UDPv6|M_CSUM_DATA: 532 #endif 533 534 case M_CSUM_UDPv6: 535 /* Checksum was okay. */ 536 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 537 break; 538 539 default: 540 /* 541 * Need to compute it ourselves. Maybe skip checksum 542 * on loopback interfaces. 543 */ 544 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 545 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 546 UDP6_STATINC(UDP6_STAT_BADSUM); 547 goto bad; 548 } 549 } 550 551 good: 552 return 0; 553 bad: 554 return -1; 555 } 556 557 int 558 udp6_input(struct mbuf **mp, int *offp, int proto) 559 { 560 struct mbuf *m = *mp; 561 int off = *offp; 562 struct sockaddr_in6 src, dst; 563 struct ip6_hdr *ip6; 564 struct udphdr *uh; 565 u_int32_t plen, ulen; 566 567 ip6 = mtod(m, struct ip6_hdr *); 568 569 #if defined(NFAITH) && 0 < NFAITH 570 if (faithprefix(&ip6->ip6_dst)) { 571 /* send icmp6 host unreach? */ 572 m_freem(m); 573 return IPPROTO_DONE; 574 } 575 #endif 576 577 UDP6_STATINC(UDP6_STAT_IPACKETS); 578 579 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 580 plen = m->m_pkthdr.len - off; 581 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 582 if (uh == NULL) { 583 IP6_STATINC(IP6_STAT_TOOSHORT); 584 return IPPROTO_DONE; 585 } 586 KASSERT(UDP_HDR_ALIGNED_P(uh)); 587 ulen = ntohs((u_short)uh->uh_ulen); 588 /* 589 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 590 * iff payload length > 0xffff. 591 */ 592 if (ulen == 0 && plen > 0xffff) 593 ulen = plen; 594 595 if (plen != ulen) { 596 UDP6_STATINC(UDP6_STAT_BADLEN); 597 goto bad; 598 } 599 600 /* destination port of 0 is illegal, based on RFC768. */ 601 if (uh->uh_dport == 0) 602 goto bad; 603 604 /* Be proactive about malicious use of IPv4 mapped address */ 605 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 606 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 607 /* XXX stat */ 608 goto bad; 609 } 610 611 /* 612 * Checksum extended UDP header and data. Maybe skip checksum 613 * on loopback interfaces. 614 */ 615 if (udp6_input_checksum(m, uh, off, ulen)) 616 goto bad; 617 618 /* 619 * Construct source and dst sockaddrs. 620 */ 621 memset(&src, 0, sizeof(src)); 622 src.sin6_family = AF_INET6; 623 src.sin6_len = sizeof(struct sockaddr_in6); 624 src.sin6_addr = ip6->ip6_src; 625 src.sin6_port = uh->uh_sport; 626 memset(&dst, 0, sizeof(dst)); 627 dst.sin6_family = AF_INET6; 628 dst.sin6_len = sizeof(struct sockaddr_in6); 629 dst.sin6_addr = ip6->ip6_dst; 630 dst.sin6_port = uh->uh_dport; 631 632 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 633 if (m->m_flags & M_MCAST) { 634 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 635 goto bad; 636 } 637 UDP6_STATINC(UDP6_STAT_NOPORT); 638 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 639 m = NULL; 640 } 641 642 bad: 643 if (m) 644 m_freem(m); 645 return IPPROTO_DONE; 646 } 647 648 static int 649 udp6_attach(struct socket *so, int proto) 650 { 651 struct in6pcb *in6p; 652 int s, error; 653 654 KASSERT(sotoin6pcb(so) == NULL); 655 sosetlock(so); 656 657 /* 658 * MAPPED_ADDR implementation spec: 659 * Always attach for IPv6, and only when necessary for IPv4. 660 */ 661 s = splsoftnet(); 662 error = in6_pcballoc(so, &udbtable); 663 splx(s); 664 if (error) { 665 return error; 666 } 667 error = soreserve(so, udp6_sendspace, udp6_recvspace); 668 if (error) { 669 return error; 670 } 671 in6p = sotoin6pcb(so); 672 in6p->in6p_cksum = -1; /* just to be sure */ 673 674 KASSERT(solocked(so)); 675 return 0; 676 } 677 678 static void 679 udp6_detach(struct socket *so) 680 { 681 struct in6pcb *in6p = sotoin6pcb(so); 682 int s; 683 684 KASSERT(solocked(so)); 685 KASSERT(in6p != NULL); 686 687 s = splsoftnet(); 688 in6_pcbdetach(in6p); 689 splx(s); 690 } 691 692 static int 693 udp6_accept(struct socket *so, struct sockaddr *nam) 694 { 695 KASSERT(solocked(so)); 696 697 return EOPNOTSUPP; 698 } 699 700 static int 701 udp6_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) 702 { 703 struct in6pcb *in6p = sotoin6pcb(so); 704 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 705 int error = 0; 706 int s; 707 708 KASSERT(solocked(so)); 709 KASSERT(in6p != NULL); 710 711 s = splsoftnet(); 712 error = in6_pcbbind(in6p, sin6, l); 713 splx(s); 714 return error; 715 } 716 717 static int 718 udp6_listen(struct socket *so, struct lwp *l) 719 { 720 KASSERT(solocked(so)); 721 722 return EOPNOTSUPP; 723 } 724 725 static int 726 udp6_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) 727 { 728 struct in6pcb *in6p = sotoin6pcb(so); 729 int error = 0; 730 int s; 731 732 KASSERT(solocked(so)); 733 KASSERT(in6p != NULL); 734 735 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 736 return EISCONN; 737 s = splsoftnet(); 738 error = in6_pcbconnect(in6p, (struct sockaddr_in6 *)nam, l); 739 splx(s); 740 if (error == 0) 741 soisconnected(so); 742 743 return error; 744 } 745 746 static int 747 udp6_connect2(struct socket *so, struct socket *so2) 748 { 749 KASSERT(solocked(so)); 750 751 return EOPNOTSUPP; 752 } 753 754 static int 755 udp6_disconnect(struct socket *so) 756 { 757 struct in6pcb *in6p = sotoin6pcb(so); 758 int s; 759 760 KASSERT(solocked(so)); 761 KASSERT(in6p != NULL); 762 763 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 764 return ENOTCONN; 765 766 s = splsoftnet(); 767 in6_pcbdisconnect(in6p); 768 memset((void *)&in6p->in6p_laddr, 0, sizeof(in6p->in6p_laddr)); 769 splx(s); 770 771 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 772 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 773 return 0; 774 } 775 776 static int 777 udp6_shutdown(struct socket *so) 778 { 779 int s; 780 781 s = splsoftnet(); 782 socantsendmore(so); 783 splx(s); 784 785 return 0; 786 } 787 788 static int 789 udp6_abort(struct socket *so) 790 { 791 int s; 792 793 KASSERT(solocked(so)); 794 KASSERT(sotoin6pcb(so) != NULL); 795 796 s = splsoftnet(); 797 soisdisconnected(so); 798 in6_pcbdetach(sotoin6pcb(so)); 799 splx(s); 800 801 return 0; 802 } 803 804 static int 805 udp6_ioctl(struct socket *so, u_long cmd, void *addr6, struct ifnet *ifp) 806 { 807 /* 808 * MAPPED_ADDR implementation info: 809 * Mapped addr support for PRU_CONTROL is not necessary. 810 * Because typical user of PRU_CONTROL is such as ifconfig, 811 * and they don't associate any addr to their socket. Then 812 * socket family is only hint about the PRU_CONTROL'ed address 813 * family, especially when getting addrs from kernel. 814 * So AF_INET socket need to be used to control AF_INET addrs, 815 * and AF_INET6 socket for AF_INET6 addrs. 816 */ 817 return in6_control(so, cmd, addr6, ifp); 818 } 819 820 static int 821 udp6_stat(struct socket *so, struct stat *ub) 822 { 823 KASSERT(solocked(so)); 824 825 /* stat: don't bother with a blocksize */ 826 return 0; 827 } 828 829 static int 830 udp6_peeraddr(struct socket *so, struct sockaddr *nam) 831 { 832 KASSERT(solocked(so)); 833 KASSERT(sotoin6pcb(so) != NULL); 834 KASSERT(nam != NULL); 835 836 in6_setpeeraddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam); 837 return 0; 838 } 839 840 static int 841 udp6_sockaddr(struct socket *so, struct sockaddr *nam) 842 { 843 KASSERT(solocked(so)); 844 KASSERT(sotoin6pcb(so) != NULL); 845 KASSERT(nam != NULL); 846 847 in6_setsockaddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam); 848 return 0; 849 } 850 851 static int 852 udp6_rcvd(struct socket *so, int flags, struct lwp *l) 853 { 854 KASSERT(solocked(so)); 855 856 return EOPNOTSUPP; 857 } 858 859 static int 860 udp6_recvoob(struct socket *so, struct mbuf *m, int flags) 861 { 862 KASSERT(solocked(so)); 863 864 return EOPNOTSUPP; 865 } 866 867 static int 868 udp6_send(struct socket *so, struct mbuf *m, struct sockaddr *nam, 869 struct mbuf *control, struct lwp *l) 870 { 871 struct in6pcb *in6p = sotoin6pcb(so); 872 int error = 0; 873 int s; 874 875 KASSERT(solocked(so)); 876 KASSERT(in6p != NULL); 877 KASSERT(m != NULL); 878 879 s = splsoftnet(); 880 error = udp6_output(in6p, m, (struct sockaddr_in6 *)nam, control, l); 881 splx(s); 882 883 return error; 884 } 885 886 static int 887 udp6_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) 888 { 889 KASSERT(solocked(so)); 890 891 if (m) 892 m_freem(m); 893 if (control) 894 m_freem(control); 895 896 return EOPNOTSUPP; 897 } 898 899 static int 900 udp6_purgeif(struct socket *so, struct ifnet *ifp) 901 { 902 903 mutex_enter(softnet_lock); 904 in6_pcbpurgeif0(&udbtable, ifp); 905 in6_purgeif(ifp); 906 in6_pcbpurgeif(&udbtable, ifp); 907 mutex_exit(softnet_lock); 908 909 return 0; 910 } 911 912 static int 913 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 914 { 915 916 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 917 } 918 919 static void 920 sysctl_net_inet6_udp6_setup(struct sysctllog **clog) 921 { 922 923 sysctl_createv(clog, 0, NULL, NULL, 924 CTLFLAG_PERMANENT, 925 CTLTYPE_NODE, "inet6", NULL, 926 NULL, 0, NULL, 0, 927 CTL_NET, PF_INET6, CTL_EOL); 928 sysctl_createv(clog, 0, NULL, NULL, 929 CTLFLAG_PERMANENT, 930 CTLTYPE_NODE, "udp6", 931 SYSCTL_DESCR("UDPv6 related settings"), 932 NULL, 0, NULL, 0, 933 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 934 935 sysctl_createv(clog, 0, NULL, NULL, 936 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 937 CTLTYPE_INT, "sendspace", 938 SYSCTL_DESCR("Default UDP send buffer size"), 939 NULL, 0, &udp6_sendspace, 0, 940 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 941 CTL_EOL); 942 sysctl_createv(clog, 0, NULL, NULL, 943 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 944 CTLTYPE_INT, "recvspace", 945 SYSCTL_DESCR("Default UDP receive buffer size"), 946 NULL, 0, &udp6_recvspace, 0, 947 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 948 CTL_EOL); 949 sysctl_createv(clog, 0, NULL, NULL, 950 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 951 CTLTYPE_INT, "do_loopback_cksum", 952 SYSCTL_DESCR("Perform UDP checksum on loopback"), 953 NULL, 0, &udp_do_loopback_cksum, 0, 954 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 955 CTL_EOL); 956 sysctl_createv(clog, 0, NULL, NULL, 957 CTLFLAG_PERMANENT, 958 CTLTYPE_STRUCT, "pcblist", 959 SYSCTL_DESCR("UDP protocol control block list"), 960 sysctl_inpcblist, 0, &udbtable, 0, 961 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 962 CTL_EOL); 963 sysctl_createv(clog, 0, NULL, NULL, 964 CTLFLAG_PERMANENT, 965 CTLTYPE_STRUCT, "stats", 966 SYSCTL_DESCR("UDPv6 statistics"), 967 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 968 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 969 CTL_EOL); 970 } 971 972 void 973 udp6_statinc(u_int stat) 974 { 975 976 KASSERT(stat < UDP6_NSTATS); 977 UDP6_STATINC(stat); 978 } 979 980 PR_WRAP_USRREQS(udp6) 981 #define udp6_attach udp6_attach_wrapper 982 #define udp6_detach udp6_detach_wrapper 983 #define udp6_accept udp6_accept_wrapper 984 #define udp6_bind udp6_bind_wrapper 985 #define udp6_listen udp6_listen_wrapper 986 #define udp6_connect udp6_connect_wrapper 987 #define udp6_connect2 udp6_connect2_wrapper 988 #define udp6_disconnect udp6_disconnect_wrapper 989 #define udp6_shutdown udp6_shutdown_wrapper 990 #define udp6_abort udp6_abort_wrapper 991 #define udp6_ioctl udp6_ioctl_wrapper 992 #define udp6_stat udp6_stat_wrapper 993 #define udp6_peeraddr udp6_peeraddr_wrapper 994 #define udp6_sockaddr udp6_sockaddr_wrapper 995 #define udp6_rcvd udp6_rcvd_wrapper 996 #define udp6_recvoob udp6_recvoob_wrapper 997 #define udp6_send udp6_send_wrapper 998 #define udp6_sendoob udp6_sendoob_wrapper 999 #define udp6_purgeif udp6_purgeif_wrapper 1000 1001 const struct pr_usrreqs udp6_usrreqs = { 1002 .pr_attach = udp6_attach, 1003 .pr_detach = udp6_detach, 1004 .pr_accept = udp6_accept, 1005 .pr_bind = udp6_bind, 1006 .pr_listen = udp6_listen, 1007 .pr_connect = udp6_connect, 1008 .pr_connect2 = udp6_connect2, 1009 .pr_disconnect = udp6_disconnect, 1010 .pr_shutdown = udp6_shutdown, 1011 .pr_abort = udp6_abort, 1012 .pr_ioctl = udp6_ioctl, 1013 .pr_stat = udp6_stat, 1014 .pr_peeraddr = udp6_peeraddr, 1015 .pr_sockaddr = udp6_sockaddr, 1016 .pr_rcvd = udp6_rcvd, 1017 .pr_recvoob = udp6_recvoob, 1018 .pr_send = udp6_send, 1019 .pr_sendoob = udp6_sendoob, 1020 .pr_purgeif = udp6_purgeif, 1021 }; 1022
Indexes created Mon Sep 29 21:09:56 GMT 2025