udp6_usrreq.c revision 1.128
1 /* $NetBSD: udp6_usrreq.c,v 1.128 2017/04/20 08:45:09 ozaki-r 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 1.128 2017/04/20 08:45:09 ozaki-r 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 */ 127 128 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_so(m, so)) { 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 #ifdef SO_OTIMESTAMP 367 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 368 #endif 369 || in6p->in6p_socket->so_options & SO_TIMESTAMP) { 370 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 371 ip6_savecontrol(in6p, &opts, ip6, n); 372 } 373 374 m_adj(n, off); 375 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 376 m_freem(n); 377 if (opts) 378 m_freem(opts); 379 so->so_rcv.sb_overflowed++; 380 UDP6_STATINC(UDP6_STAT_FULLSOCK); 381 } else 382 sorwakeup(so); 383 } 384 } 385 386 int 387 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 388 struct mbuf *m, int off) 389 { 390 u_int16_t sport, dport; 391 int rcvcnt; 392 struct in6_addr src6, *dst6; 393 const struct in_addr *dst4; 394 struct inpcb_hdr *inph; 395 struct in6pcb *in6p; 396 397 rcvcnt = 0; 398 off += sizeof(struct udphdr); /* now, offset of payload */ 399 400 if (af != AF_INET && af != AF_INET6) 401 goto bad; 402 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 403 goto bad; 404 405 src6 = src->sin6_addr; 406 if (sa6_recoverscope(src) != 0) { 407 /* XXX: should be impossible. */ 408 goto bad; 409 } 410 sport = src->sin6_port; 411 412 dport = dst->sin6_port; 413 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 414 dst6 = &dst->sin6_addr; 415 416 if (IN6_IS_ADDR_MULTICAST(dst6) || 417 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 418 /* 419 * Deliver a multicast or broadcast datagram to *all* sockets 420 * for which the local and remote addresses and ports match 421 * those of the incoming datagram. This allows more than 422 * one process to receive multi/broadcasts on the same port. 423 * (This really ought to be done for unicast datagrams as 424 * well, but that would cause problems with existing 425 * applications that open both address-specific sockets and 426 * a wildcard socket listening to the same port -- they would 427 * end up receiving duplicates of every unicast datagram. 428 * Those applications open the multiple sockets to overcome an 429 * inadequacy of the UDP socket interface, but for backwards 430 * compatibility we avoid the problem here rather than 431 * fixing the interface. Maybe 4.5BSD will remedy this?) 432 */ 433 434 /* 435 * KAME note: traditionally we dropped udpiphdr from mbuf here. 436 * we need udpiphdr for IPsec processing so we do that later. 437 */ 438 /* 439 * Locate pcb(s) for datagram. 440 */ 441 TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 442 in6p = (struct in6pcb *)inph; 443 if (in6p->in6p_af != AF_INET6) 444 continue; 445 446 if (in6p->in6p_lport != dport) 447 continue; 448 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 449 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 450 dst6)) 451 continue; 452 } else { 453 if (IN6_IS_ADDR_V4MAPPED(dst6) && 454 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 455 continue; 456 } 457 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 458 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 459 &src6) || in6p->in6p_fport != sport) 460 continue; 461 } else { 462 if (IN6_IS_ADDR_V4MAPPED(&src6) && 463 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 464 continue; 465 } 466 467 udp6_sendup(m, off, sin6tosa(src), in6p->in6p_socket); 468 rcvcnt++; 469 470 /* 471 * Don't look for additional matches if this one does 472 * not have either the SO_REUSEPORT or SO_REUSEADDR 473 * socket options set. This heuristic avoids searching 474 * through all pcbs in the common case of a non-shared 475 * port. It assumes that an application will never 476 * clear these options after setting them. 477 */ 478 if ((in6p->in6p_socket->so_options & 479 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 480 break; 481 } 482 } else { 483 /* 484 * Locate pcb for datagram. 485 */ 486 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 487 dport, 0, 0); 488 if (in6p == 0) { 489 UDP_STATINC(UDP_STAT_PCBHASHMISS); 490 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 491 if (in6p == 0) 492 return rcvcnt; 493 } 494 495 udp6_sendup(m, off, sin6tosa(src), in6p->in6p_socket); 496 rcvcnt++; 497 } 498 499 bad: 500 return rcvcnt; 501 } 502 503 int 504 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 505 { 506 507 /* 508 * XXX it's better to record and check if this mbuf is 509 * already checked. 510 */ 511 512 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 513 goto good; 514 } 515 if (uh->uh_sum == 0) { 516 UDP6_STATINC(UDP6_STAT_NOSUM); 517 goto bad; 518 } 519 520 switch (m->m_pkthdr.csum_flags & 521 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_UDPv6) | 522 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 523 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 524 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 525 UDP6_STATINC(UDP6_STAT_BADSUM); 526 goto bad; 527 528 #if 0 /* notyet */ 529 case M_CSUM_UDPv6|M_CSUM_DATA: 530 #endif 531 532 case M_CSUM_UDPv6: 533 /* Checksum was okay. */ 534 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 535 break; 536 537 default: 538 /* 539 * Need to compute it ourselves. Maybe skip checksum 540 * on loopback interfaces. 541 */ 542 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 543 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 544 UDP6_STATINC(UDP6_STAT_BADSUM); 545 goto bad; 546 } 547 } 548 549 good: 550 return 0; 551 bad: 552 return -1; 553 } 554 555 int 556 udp6_input(struct mbuf **mp, int *offp, int proto) 557 { 558 struct mbuf *m = *mp; 559 int off = *offp; 560 struct sockaddr_in6 src, dst; 561 struct ip6_hdr *ip6; 562 struct udphdr *uh; 563 u_int32_t plen, ulen; 564 565 ip6 = mtod(m, struct ip6_hdr *); 566 567 #if defined(NFAITH) && 0 < NFAITH 568 if (faithprefix(&ip6->ip6_dst)) { 569 /* send icmp6 host unreach? */ 570 m_freem(m); 571 return IPPROTO_DONE; 572 } 573 #endif 574 575 UDP6_STATINC(UDP6_STAT_IPACKETS); 576 577 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 578 plen = m->m_pkthdr.len - off; 579 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 580 if (uh == NULL) { 581 IP6_STATINC(IP6_STAT_TOOSHORT); 582 return IPPROTO_DONE; 583 } 584 /* 585 * Enforce alignment requirements that are violated in 586 * some cases, see kern/50766 for details. 587 */ 588 if (UDP_HDR_ALIGNED_P(uh) == 0) { 589 m = m_copyup(m, off + sizeof(struct udphdr), 0); 590 if (m == NULL) { 591 IP6_STATINC(IP6_STAT_TOOSHORT); 592 return IPPROTO_DONE; 593 } 594 ip6 = mtod(m, struct ip6_hdr *); 595 uh = (struct udphdr *)(mtod(m, char *) + off); 596 } 597 KASSERT(UDP_HDR_ALIGNED_P(uh)); 598 ulen = ntohs((u_short)uh->uh_ulen); 599 /* 600 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 601 * iff payload length > 0xffff. 602 */ 603 if (ulen == 0 && plen > 0xffff) 604 ulen = plen; 605 606 if (plen != ulen) { 607 UDP6_STATINC(UDP6_STAT_BADLEN); 608 goto bad; 609 } 610 611 /* destination port of 0 is illegal, based on RFC768. */ 612 if (uh->uh_dport == 0) 613 goto bad; 614 615 /* Be proactive about malicious use of IPv4 mapped address */ 616 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 617 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 618 /* XXX stat */ 619 goto bad; 620 } 621 622 /* 623 * Checksum extended UDP header and data. Maybe skip checksum 624 * on loopback interfaces. 625 */ 626 if (udp6_input_checksum(m, uh, off, ulen)) 627 goto bad; 628 629 /* 630 * Construct source and dst sockaddrs. 631 */ 632 memset(&src, 0, sizeof(src)); 633 src.sin6_family = AF_INET6; 634 src.sin6_len = sizeof(struct sockaddr_in6); 635 src.sin6_addr = ip6->ip6_src; 636 src.sin6_port = uh->uh_sport; 637 memset(&dst, 0, sizeof(dst)); 638 dst.sin6_family = AF_INET6; 639 dst.sin6_len = sizeof(struct sockaddr_in6); 640 dst.sin6_addr = ip6->ip6_dst; 641 dst.sin6_port = uh->uh_dport; 642 643 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 644 if (m->m_flags & M_MCAST) { 645 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 646 goto bad; 647 } 648 UDP6_STATINC(UDP6_STAT_NOPORT); 649 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 650 m = NULL; 651 } 652 653 bad: 654 if (m) 655 m_freem(m); 656 return IPPROTO_DONE; 657 } 658 659 static int 660 udp6_attach(struct socket *so, int proto) 661 { 662 struct in6pcb *in6p; 663 int s, error; 664 665 KASSERT(sotoin6pcb(so) == NULL); 666 sosetlock(so); 667 668 /* 669 * MAPPED_ADDR implementation spec: 670 * Always attach for IPv6, and only when necessary for IPv4. 671 */ 672 s = splsoftnet(); 673 error = in6_pcballoc(so, &udbtable); 674 splx(s); 675 if (error) { 676 return error; 677 } 678 error = soreserve(so, udp6_sendspace, udp6_recvspace); 679 if (error) { 680 return error; 681 } 682 in6p = sotoin6pcb(so); 683 in6p->in6p_cksum = -1; /* just to be sure */ 684 685 KASSERT(solocked(so)); 686 return 0; 687 } 688 689 static void 690 udp6_detach(struct socket *so) 691 { 692 struct in6pcb *in6p = sotoin6pcb(so); 693 int s; 694 695 KASSERT(solocked(so)); 696 KASSERT(in6p != NULL); 697 698 s = splsoftnet(); 699 in6_pcbdetach(in6p); 700 splx(s); 701 } 702 703 static int 704 udp6_accept(struct socket *so, struct sockaddr *nam) 705 { 706 KASSERT(solocked(so)); 707 708 return EOPNOTSUPP; 709 } 710 711 static int 712 udp6_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) 713 { 714 struct in6pcb *in6p = sotoin6pcb(so); 715 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 716 int error = 0; 717 int s; 718 719 KASSERT(solocked(so)); 720 KASSERT(in6p != NULL); 721 722 s = splsoftnet(); 723 error = in6_pcbbind(in6p, sin6, l); 724 splx(s); 725 return error; 726 } 727 728 static int 729 udp6_listen(struct socket *so, struct lwp *l) 730 { 731 KASSERT(solocked(so)); 732 733 return EOPNOTSUPP; 734 } 735 736 static int 737 udp6_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) 738 { 739 struct in6pcb *in6p = sotoin6pcb(so); 740 int error = 0; 741 int s; 742 743 KASSERT(solocked(so)); 744 KASSERT(in6p != NULL); 745 746 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 747 return EISCONN; 748 s = splsoftnet(); 749 error = in6_pcbconnect(in6p, (struct sockaddr_in6 *)nam, l); 750 splx(s); 751 if (error == 0) 752 soisconnected(so); 753 754 return error; 755 } 756 757 static int 758 udp6_connect2(struct socket *so, struct socket *so2) 759 { 760 KASSERT(solocked(so)); 761 762 return EOPNOTSUPP; 763 } 764 765 static int 766 udp6_disconnect(struct socket *so) 767 { 768 struct in6pcb *in6p = sotoin6pcb(so); 769 int s; 770 771 KASSERT(solocked(so)); 772 KASSERT(in6p != NULL); 773 774 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 775 return ENOTCONN; 776 777 s = splsoftnet(); 778 in6_pcbdisconnect(in6p); 779 memset((void *)&in6p->in6p_laddr, 0, sizeof(in6p->in6p_laddr)); 780 splx(s); 781 782 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 783 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 784 return 0; 785 } 786 787 static int 788 udp6_shutdown(struct socket *so) 789 { 790 int s; 791 792 s = splsoftnet(); 793 socantsendmore(so); 794 splx(s); 795 796 return 0; 797 } 798 799 static int 800 udp6_abort(struct socket *so) 801 { 802 int s; 803 804 KASSERT(solocked(so)); 805 KASSERT(sotoin6pcb(so) != NULL); 806 807 s = splsoftnet(); 808 soisdisconnected(so); 809 in6_pcbdetach(sotoin6pcb(so)); 810 splx(s); 811 812 return 0; 813 } 814 815 static int 816 udp6_ioctl(struct socket *so, u_long cmd, void *addr6, struct ifnet *ifp) 817 { 818 /* 819 * MAPPED_ADDR implementation info: 820 * Mapped addr support for PRU_CONTROL is not necessary. 821 * Because typical user of PRU_CONTROL is such as ifconfig, 822 * and they don't associate any addr to their socket. Then 823 * socket family is only hint about the PRU_CONTROL'ed address 824 * family, especially when getting addrs from kernel. 825 * So AF_INET socket need to be used to control AF_INET addrs, 826 * and AF_INET6 socket for AF_INET6 addrs. 827 */ 828 return in6_control(so, cmd, addr6, ifp); 829 } 830 831 static int 832 udp6_stat(struct socket *so, struct stat *ub) 833 { 834 KASSERT(solocked(so)); 835 836 /* stat: don't bother with a blocksize */ 837 return 0; 838 } 839 840 static int 841 udp6_peeraddr(struct socket *so, struct sockaddr *nam) 842 { 843 KASSERT(solocked(so)); 844 KASSERT(sotoin6pcb(so) != NULL); 845 KASSERT(nam != NULL); 846 847 in6_setpeeraddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam); 848 return 0; 849 } 850 851 static int 852 udp6_sockaddr(struct socket *so, struct sockaddr *nam) 853 { 854 KASSERT(solocked(so)); 855 KASSERT(sotoin6pcb(so) != NULL); 856 KASSERT(nam != NULL); 857 858 in6_setsockaddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam); 859 return 0; 860 } 861 862 static int 863 udp6_rcvd(struct socket *so, int flags, struct lwp *l) 864 { 865 KASSERT(solocked(so)); 866 867 return EOPNOTSUPP; 868 } 869 870 static int 871 udp6_recvoob(struct socket *so, struct mbuf *m, int flags) 872 { 873 KASSERT(solocked(so)); 874 875 return EOPNOTSUPP; 876 } 877 878 static int 879 udp6_send(struct socket *so, struct mbuf *m, struct sockaddr *nam, 880 struct mbuf *control, struct lwp *l) 881 { 882 struct in6pcb *in6p = sotoin6pcb(so); 883 int error = 0; 884 int s; 885 886 KASSERT(solocked(so)); 887 KASSERT(in6p != NULL); 888 KASSERT(m != NULL); 889 890 s = splsoftnet(); 891 error = udp6_output(in6p, m, (struct sockaddr_in6 *)nam, control, l); 892 splx(s); 893 894 return error; 895 } 896 897 static int 898 udp6_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) 899 { 900 KASSERT(solocked(so)); 901 902 if (m) 903 m_freem(m); 904 if (control) 905 m_freem(control); 906 907 return EOPNOTSUPP; 908 } 909 910 static int 911 udp6_purgeif(struct socket *so, struct ifnet *ifp) 912 { 913 914 mutex_enter(softnet_lock); 915 in6_pcbpurgeif0(&udbtable, ifp); 916 #ifdef NET_MPSAFE 917 mutex_exit(softnet_lock); 918 #endif 919 in6_purgeif(ifp); 920 #ifdef NET_MPSAFE 921 mutex_enter(softnet_lock); 922 #endif 923 in6_pcbpurgeif(&udbtable, ifp); 924 mutex_exit(softnet_lock); 925 926 return 0; 927 } 928 929 static int 930 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 931 { 932 933 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 934 } 935 936 static void 937 sysctl_net_inet6_udp6_setup(struct sysctllog **clog) 938 { 939 940 sysctl_createv(clog, 0, NULL, NULL, 941 CTLFLAG_PERMANENT, 942 CTLTYPE_NODE, "inet6", NULL, 943 NULL, 0, NULL, 0, 944 CTL_NET, PF_INET6, CTL_EOL); 945 sysctl_createv(clog, 0, NULL, NULL, 946 CTLFLAG_PERMANENT, 947 CTLTYPE_NODE, "udp6", 948 SYSCTL_DESCR("UDPv6 related settings"), 949 NULL, 0, NULL, 0, 950 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 951 952 sysctl_createv(clog, 0, NULL, NULL, 953 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 954 CTLTYPE_INT, "sendspace", 955 SYSCTL_DESCR("Default UDP send buffer size"), 956 NULL, 0, &udp6_sendspace, 0, 957 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 958 CTL_EOL); 959 sysctl_createv(clog, 0, NULL, NULL, 960 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 961 CTLTYPE_INT, "recvspace", 962 SYSCTL_DESCR("Default UDP receive buffer size"), 963 NULL, 0, &udp6_recvspace, 0, 964 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 965 CTL_EOL); 966 sysctl_createv(clog, 0, NULL, NULL, 967 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 968 CTLTYPE_INT, "do_loopback_cksum", 969 SYSCTL_DESCR("Perform UDP checksum on loopback"), 970 NULL, 0, &udp_do_loopback_cksum, 0, 971 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 972 CTL_EOL); 973 sysctl_createv(clog, 0, NULL, NULL, 974 CTLFLAG_PERMANENT, 975 CTLTYPE_STRUCT, "pcblist", 976 SYSCTL_DESCR("UDP protocol control block list"), 977 sysctl_inpcblist, 0, &udbtable, 0, 978 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 979 CTL_EOL); 980 sysctl_createv(clog, 0, NULL, NULL, 981 CTLFLAG_PERMANENT, 982 CTLTYPE_STRUCT, "stats", 983 SYSCTL_DESCR("UDPv6 statistics"), 984 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 985 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 986 CTL_EOL); 987 } 988 989 void 990 udp6_statinc(u_int stat) 991 { 992 993 KASSERT(stat < UDP6_NSTATS); 994 UDP6_STATINC(stat); 995 } 996 997 PR_WRAP_USRREQS(udp6) 998 #define udp6_attach udp6_attach_wrapper 999 #define udp6_detach udp6_detach_wrapper 1000 #define udp6_accept udp6_accept_wrapper 1001 #define udp6_bind udp6_bind_wrapper 1002 #define udp6_listen udp6_listen_wrapper 1003 #define udp6_connect udp6_connect_wrapper 1004 #define udp6_connect2 udp6_connect2_wrapper 1005 #define udp6_disconnect udp6_disconnect_wrapper 1006 #define udp6_shutdown udp6_shutdown_wrapper 1007 #define udp6_abort udp6_abort_wrapper 1008 #define udp6_ioctl udp6_ioctl_wrapper 1009 #define udp6_stat udp6_stat_wrapper 1010 #define udp6_peeraddr udp6_peeraddr_wrapper 1011 #define udp6_sockaddr udp6_sockaddr_wrapper 1012 #define udp6_rcvd udp6_rcvd_wrapper 1013 #define udp6_recvoob udp6_recvoob_wrapper 1014 #define udp6_send udp6_send_wrapper 1015 #define udp6_sendoob udp6_sendoob_wrapper 1016 #define udp6_purgeif udp6_purgeif_wrapper 1017 1018 const struct pr_usrreqs udp6_usrreqs = { 1019 .pr_attach = udp6_attach, 1020 .pr_detach = udp6_detach, 1021 .pr_accept = udp6_accept, 1022 .pr_bind = udp6_bind, 1023 .pr_listen = udp6_listen, 1024 .pr_connect = udp6_connect, 1025 .pr_connect2 = udp6_connect2, 1026 .pr_disconnect = udp6_disconnect, 1027 .pr_shutdown = udp6_shutdown, 1028 .pr_abort = udp6_abort, 1029 .pr_ioctl = udp6_ioctl, 1030 .pr_stat = udp6_stat, 1031 .pr_peeraddr = udp6_peeraddr, 1032 .pr_sockaddr = udp6_sockaddr, 1033 .pr_rcvd = udp6_rcvd, 1034 .pr_recvoob = udp6_recvoob, 1035 .pr_send = udp6_send, 1036 .pr_sendoob = udp6_sendoob, 1037 .pr_purgeif = udp6_purgeif, 1038 }; 1039
Indexes created Tue Sep 23 07:09:52 GMT 2025