udp6_usrreq.c revision 1.131
1 /* $NetBSD: udp6_usrreq.c,v 1.131 2018/02/08 11:13:20 maxv 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 1.131 2018/02/08 11:13:20 maxv 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 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 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 } 301 302 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; 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 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 } 382 383 int 384 udp6_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 } 495 496 bad: 497 return rcvcnt; 498 } 499 500 int 501 udp6_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 } 545 546 good: 547 return 0; 548 bad: 549 return -1; 550 } 551 552 int 553 udp6_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 /* 583 * Enforce alignment requirements that are violated in 584 * some cases, see kern/50766 for details. 585 */ 586 if (UDP_HDR_ALIGNED_P(uh) == 0) { 587 m = m_copyup(m, off + sizeof(struct udphdr), 0); 588 if (m == NULL) { 589 IP6_STATINC(IP6_STAT_TOOSHORT); 590 return IPPROTO_DONE; 591 } 592 ip6 = mtod(m, struct ip6_hdr *); 593 uh = (struct udphdr *)(mtod(m, char *) + off); 594 } 595 KASSERT(UDP_HDR_ALIGNED_P(uh)); 596 ulen = ntohs((u_short)uh->uh_ulen); 597 598 /* 599 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 600 * iff payload length > 0xffff. 601 */ 602 if (ulen == 0 && plen > 0xffff) 603 ulen = plen; 604 605 if (plen != ulen) { 606 UDP6_STATINC(UDP6_STAT_BADLEN); 607 goto bad; 608 } 609 610 /* destination port of 0 is illegal, based on RFC768. */ 611 if (uh->uh_dport == 0) 612 goto bad; 613 614 /* Be proactive about malicious use of IPv4 mapped address */ 615 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 616 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 617 /* XXX stat */ 618 goto bad; 619 } 620 621 /* 622 * Checksum extended UDP header and data. Maybe skip checksum 623 * on loopback interfaces. 624 */ 625 if (udp6_input_checksum(m, uh, off, ulen)) 626 goto bad; 627 628 /* 629 * Construct source and dst sockaddrs. 630 */ 631 memset(&src, 0, sizeof(src)); 632 src.sin6_family = AF_INET6; 633 src.sin6_len = sizeof(struct sockaddr_in6); 634 src.sin6_addr = ip6->ip6_src; 635 src.sin6_port = uh->uh_sport; 636 memset(&dst, 0, sizeof(dst)); 637 dst.sin6_family = AF_INET6; 638 dst.sin6_len = sizeof(struct sockaddr_in6); 639 dst.sin6_addr = ip6->ip6_dst; 640 dst.sin6_port = uh->uh_dport; 641 642 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 643 if (m->m_flags & M_MCAST) { 644 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 645 goto bad; 646 } 647 UDP6_STATINC(UDP6_STAT_NOPORT); 648 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 649 m = NULL; 650 } 651 652 bad: 653 if (m) 654 m_freem(m); 655 return IPPROTO_DONE; 656 } 657 658 static int 659 udp6_attach(struct socket *so, int proto) 660 { 661 struct in6pcb *in6p; 662 int s, error; 663 664 KASSERT(sotoin6pcb(so) == NULL); 665 sosetlock(so); 666 667 /* 668 * MAPPED_ADDR implementation spec: 669 * Always attach for IPv6, and only when necessary for IPv4. 670 */ 671 s = splsoftnet(); 672 error = in6_pcballoc(so, &udbtable); 673 splx(s); 674 if (error) { 675 return error; 676 } 677 error = soreserve(so, udp6_sendspace, udp6_recvspace); 678 if (error) { 679 return error; 680 } 681 in6p = sotoin6pcb(so); 682 in6p->in6p_cksum = -1; /* just to be sure */ 683 684 KASSERT(solocked(so)); 685 return 0; 686 } 687 688 static void 689 udp6_detach(struct socket *so) 690 { 691 struct in6pcb *in6p = sotoin6pcb(so); 692 int s; 693 694 KASSERT(solocked(so)); 695 KASSERT(in6p != NULL); 696 697 s = splsoftnet(); 698 in6_pcbdetach(in6p); 699 splx(s); 700 } 701 702 static int 703 udp6_accept(struct socket *so, struct sockaddr *nam) 704 { 705 KASSERT(solocked(so)); 706 707 return EOPNOTSUPP; 708 } 709 710 static int 711 udp6_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) 712 { 713 struct in6pcb *in6p = sotoin6pcb(so); 714 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 715 int error = 0; 716 int s; 717 718 KASSERT(solocked(so)); 719 KASSERT(in6p != NULL); 720 721 s = splsoftnet(); 722 error = in6_pcbbind(in6p, sin6, l); 723 splx(s); 724 return error; 725 } 726 727 static int 728 udp6_listen(struct socket *so, struct lwp *l) 729 { 730 KASSERT(solocked(so)); 731 732 return EOPNOTSUPP; 733 } 734 735 static int 736 udp6_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) 737 { 738 struct in6pcb *in6p = sotoin6pcb(so); 739 int error = 0; 740 int s; 741 742 KASSERT(solocked(so)); 743 KASSERT(in6p != NULL); 744 745 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 746 return EISCONN; 747 s = splsoftnet(); 748 error = in6_pcbconnect(in6p, (struct sockaddr_in6 *)nam, l); 749 splx(s); 750 if (error == 0) 751 soisconnected(so); 752 753 return error; 754 } 755 756 static int 757 udp6_connect2(struct socket *so, struct socket *so2) 758 { 759 KASSERT(solocked(so)); 760 761 return EOPNOTSUPP; 762 } 763 764 static int 765 udp6_disconnect(struct socket *so) 766 { 767 struct in6pcb *in6p = sotoin6pcb(so); 768 int s; 769 770 KASSERT(solocked(so)); 771 KASSERT(in6p != NULL); 772 773 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 774 return ENOTCONN; 775 776 s = splsoftnet(); 777 in6_pcbdisconnect(in6p); 778 memset((void *)&in6p->in6p_laddr, 0, sizeof(in6p->in6p_laddr)); 779 splx(s); 780 781 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 782 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 783 return 0; 784 } 785 786 static int 787 udp6_shutdown(struct socket *so) 788 { 789 int s; 790 791 s = splsoftnet(); 792 socantsendmore(so); 793 splx(s); 794 795 return 0; 796 } 797 798 static int 799 udp6_abort(struct socket *so) 800 { 801 int s; 802 803 KASSERT(solocked(so)); 804 KASSERT(sotoin6pcb(so) != NULL); 805 806 s = splsoftnet(); 807 soisdisconnected(so); 808 in6_pcbdetach(sotoin6pcb(so)); 809 splx(s); 810 811 return 0; 812 } 813 814 static int 815 udp6_ioctl(struct socket *so, u_long cmd, void *addr6, struct ifnet *ifp) 816 { 817 /* 818 * MAPPED_ADDR implementation info: 819 * Mapped addr support for PRU_CONTROL is not necessary. 820 * Because typical user of PRU_CONTROL is such as ifconfig, 821 * and they don't associate any addr to their socket. Then 822 * socket family is only hint about the PRU_CONTROL'ed address 823 * family, especially when getting addrs from kernel. 824 * So AF_INET socket need to be used to control AF_INET addrs, 825 * and AF_INET6 socket for AF_INET6 addrs. 826 */ 827 return in6_control(so, cmd, addr6, ifp); 828 } 829 830 static int 831 udp6_stat(struct socket *so, struct stat *ub) 832 { 833 KASSERT(solocked(so)); 834 835 /* stat: don't bother with a blocksize */ 836 return 0; 837 } 838 839 static int 840 udp6_peeraddr(struct socket *so, struct sockaddr *nam) 841 { 842 KASSERT(solocked(so)); 843 KASSERT(sotoin6pcb(so) != NULL); 844 KASSERT(nam != NULL); 845 846 in6_setpeeraddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam); 847 return 0; 848 } 849 850 static int 851 udp6_sockaddr(struct socket *so, struct sockaddr *nam) 852 { 853 KASSERT(solocked(so)); 854 KASSERT(sotoin6pcb(so) != NULL); 855 KASSERT(nam != NULL); 856 857 in6_setsockaddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam); 858 return 0; 859 } 860 861 static int 862 udp6_rcvd(struct socket *so, int flags, struct lwp *l) 863 { 864 KASSERT(solocked(so)); 865 866 return EOPNOTSUPP; 867 } 868 869 static int 870 udp6_recvoob(struct socket *so, struct mbuf *m, int flags) 871 { 872 KASSERT(solocked(so)); 873 874 return EOPNOTSUPP; 875 } 876 877 static int 878 udp6_send(struct socket *so, struct mbuf *m, struct sockaddr *nam, 879 struct mbuf *control, struct lwp *l) 880 { 881 struct in6pcb *in6p = sotoin6pcb(so); 882 int error = 0; 883 int s; 884 885 KASSERT(solocked(so)); 886 KASSERT(in6p != NULL); 887 KASSERT(m != NULL); 888 889 s = splsoftnet(); 890 error = udp6_output(in6p, m, (struct sockaddr_in6 *)nam, control, l); 891 splx(s); 892 893 return error; 894 } 895 896 static int 897 udp6_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) 898 { 899 KASSERT(solocked(so)); 900 901 if (m) 902 m_freem(m); 903 if (control) 904 m_freem(control); 905 906 return EOPNOTSUPP; 907 } 908 909 static int 910 udp6_purgeif(struct socket *so, struct ifnet *ifp) 911 { 912 913 mutex_enter(softnet_lock); 914 in6_pcbpurgeif0(&udbtable, ifp); 915 #ifdef NET_MPSAFE 916 mutex_exit(softnet_lock); 917 #endif 918 in6_purgeif(ifp); 919 #ifdef NET_MPSAFE 920 mutex_enter(softnet_lock); 921 #endif 922 in6_pcbpurgeif(&udbtable, ifp); 923 mutex_exit(softnet_lock); 924 925 return 0; 926 } 927 928 static int 929 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 930 { 931 932 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 933 } 934 935 static void 936 sysctl_net_inet6_udp6_setup(struct sysctllog **clog) 937 { 938 939 sysctl_createv(clog, 0, NULL, NULL, 940 CTLFLAG_PERMANENT, 941 CTLTYPE_NODE, "inet6", NULL, 942 NULL, 0, NULL, 0, 943 CTL_NET, PF_INET6, CTL_EOL); 944 sysctl_createv(clog, 0, NULL, NULL, 945 CTLFLAG_PERMANENT, 946 CTLTYPE_NODE, "udp6", 947 SYSCTL_DESCR("UDPv6 related settings"), 948 NULL, 0, NULL, 0, 949 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 950 951 sysctl_createv(clog, 0, NULL, NULL, 952 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 953 CTLTYPE_INT, "sendspace", 954 SYSCTL_DESCR("Default UDP send buffer size"), 955 NULL, 0, &udp6_sendspace, 0, 956 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 957 CTL_EOL); 958 sysctl_createv(clog, 0, NULL, NULL, 959 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 960 CTLTYPE_INT, "recvspace", 961 SYSCTL_DESCR("Default UDP receive buffer size"), 962 NULL, 0, &udp6_recvspace, 0, 963 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 964 CTL_EOL); 965 sysctl_createv(clog, 0, NULL, NULL, 966 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 967 CTLTYPE_INT, "do_loopback_cksum", 968 SYSCTL_DESCR("Perform UDP checksum on loopback"), 969 NULL, 0, &udp_do_loopback_cksum, 0, 970 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 971 CTL_EOL); 972 sysctl_createv(clog, 0, NULL, NULL, 973 CTLFLAG_PERMANENT, 974 CTLTYPE_STRUCT, "pcblist", 975 SYSCTL_DESCR("UDP protocol control block list"), 976 sysctl_inpcblist, 0, &udbtable, 0, 977 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 978 CTL_EOL); 979 sysctl_createv(clog, 0, NULL, NULL, 980 CTLFLAG_PERMANENT, 981 CTLTYPE_STRUCT, "stats", 982 SYSCTL_DESCR("UDPv6 statistics"), 983 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 984 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 985 CTL_EOL); 986 } 987 988 void 989 udp6_statinc(u_int stat) 990 { 991 992 KASSERT(stat < UDP6_NSTATS); 993 UDP6_STATINC(stat); 994 } 995 996 PR_WRAP_USRREQS(udp6) 997 #define udp6_attach udp6_attach_wrapper 998 #define udp6_detach udp6_detach_wrapper 999 #define udp6_accept udp6_accept_wrapper 1000 #define udp6_bind udp6_bind_wrapper 1001 #define udp6_listen udp6_listen_wrapper 1002 #define udp6_connect udp6_connect_wrapper 1003 #define udp6_connect2 udp6_connect2_wrapper 1004 #define udp6_disconnect udp6_disconnect_wrapper 1005 #define udp6_shutdown udp6_shutdown_wrapper 1006 #define udp6_abort udp6_abort_wrapper 1007 #define udp6_ioctl udp6_ioctl_wrapper 1008 #define udp6_stat udp6_stat_wrapper 1009 #define udp6_peeraddr udp6_peeraddr_wrapper 1010 #define udp6_sockaddr udp6_sockaddr_wrapper 1011 #define udp6_rcvd udp6_rcvd_wrapper 1012 #define udp6_recvoob udp6_recvoob_wrapper 1013 #define udp6_send udp6_send_wrapper 1014 #define udp6_sendoob udp6_sendoob_wrapper 1015 #define udp6_purgeif udp6_purgeif_wrapper 1016 1017 const struct pr_usrreqs udp6_usrreqs = { 1018 .pr_attach = udp6_attach, 1019 .pr_detach = udp6_detach, 1020 .pr_accept = udp6_accept, 1021 .pr_bind = udp6_bind, 1022 .pr_listen = udp6_listen, 1023 .pr_connect = udp6_connect, 1024 .pr_connect2 = udp6_connect2, 1025 .pr_disconnect = udp6_disconnect, 1026 .pr_shutdown = udp6_shutdown, 1027 .pr_abort = udp6_abort, 1028 .pr_ioctl = udp6_ioctl, 1029 .pr_stat = udp6_stat, 1030 .pr_peeraddr = udp6_peeraddr, 1031 .pr_sockaddr = udp6_sockaddr, 1032 .pr_rcvd = udp6_rcvd, 1033 .pr_recvoob = udp6_recvoob, 1034 .pr_send = udp6_send, 1035 .pr_sendoob = udp6_sendoob, 1036 .pr_purgeif = udp6_purgeif, 1037 }; 1038
Indexes created Tue Sep 23 07:09:52 GMT 2025