udp6_usrreq.c revision 1.123
1 /* $NetBSD: udp6_usrreq.c,v 1.123 2016/06/10 13:31:44 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 1.123 2016/06/10 13:31:44 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 #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/if_types.h> 86 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet/in_systm.h> 90 #include <netinet/in_offload.h> 91 #include <netinet/ip.h> 92 #include <netinet/ip_var.h> 93 #include <netinet/in_pcb.h> 94 #include <netinet/udp.h> 95 #include <netinet/udp_var.h> 96 #include <netinet/udp_private.h> 97 98 #include <netinet/ip6.h> 99 #include <netinet/icmp6.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet6/ip6_private.h> 102 #include <netinet6/in6_pcb.h> 103 #include <netinet6/udp6_var.h> 104 #include <netinet6/udp6_private.h> 105 #include <netinet6/ip6protosw.h> 106 #include <netinet6/scope6_var.h> 107 108 #ifdef IPSEC 109 #include <netipsec/ipsec.h> 110 #include <netipsec/ipsec_var.h> 111 #include <netipsec/ipsec_private.h> 112 #ifdef INET6 113 #include <netipsec/ipsec6.h> 114 #endif 115 #endif /* IPSEC */ 116 117 #include "faith.h" 118 #if defined(NFAITH) && NFAITH > 0 119 #include <net/if_faith.h> 120 #endif 121 122 /* 123 * UDP protocol implementation. 124 * Per RFC 768, August, 1980. 125 */ 126 127 extern struct inpcbtable udbtable; 128 129 percpu_t *udp6stat_percpu; 130 131 /* UDP on IP6 parameters */ 132 static int udp6_sendspace = 9216; /* really max datagram size */ 133 static int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6)); 134 /* 40 1K datagrams */ 135 136 static void udp6_notify(struct in6pcb *, int); 137 static void sysctl_net_inet6_udp6_setup(struct sysctllog **); 138 139 #ifdef UDP_CSUM_COUNTERS 140 #include <sys/device.h> 141 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 142 NULL, "udp6", "hwcsum bad"); 143 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 144 NULL, "udp6", "hwcsum ok"); 145 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 146 NULL, "udp6", "hwcsum data"); 147 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 148 NULL, "udp6", "swcsum"); 149 150 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 151 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 152 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 153 EVCNT_ATTACH_STATIC(udp6_swcsum); 154 155 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 156 #else 157 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 158 #endif 159 160 void 161 udp6_init(void) 162 { 163 sysctl_net_inet6_udp6_setup(NULL); 164 udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS); 165 166 udp_init_common(); 167 } 168 169 /* 170 * Notify a udp user of an asynchronous error; 171 * just wake up so that he can collect error status. 172 */ 173 static void 174 udp6_notify(struct in6pcb *in6p, int errno) 175 { 176 in6p->in6p_socket->so_error = errno; 177 sorwakeup(in6p->in6p_socket); 178 sowwakeup(in6p->in6p_socket); 179 } 180 181 void * 182 udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 183 { 184 struct udphdr uh; 185 struct ip6_hdr *ip6; 186 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 187 struct mbuf *m; 188 int off; 189 void *cmdarg; 190 struct ip6ctlparam *ip6cp = NULL; 191 const struct sockaddr_in6 *sa6_src = NULL; 192 void (*notify)(struct in6pcb *, int) = udp6_notify; 193 struct udp_portonly { 194 u_int16_t uh_sport; 195 u_int16_t uh_dport; 196 } *uhp; 197 198 if (sa->sa_family != AF_INET6 || 199 sa->sa_len != sizeof(struct sockaddr_in6)) 200 return NULL; 201 202 if ((unsigned)cmd >= PRC_NCMDS) 203 return NULL; 204 if (PRC_IS_REDIRECT(cmd)) 205 notify = in6_rtchange, d = NULL; 206 else if (cmd == PRC_HOSTDEAD) 207 d = NULL; 208 else if (cmd == PRC_MSGSIZE) { 209 /* special code is present, see below */ 210 notify = in6_rtchange; 211 } 212 else if (inet6ctlerrmap[cmd] == 0) 213 return NULL; 214 215 /* if the parameter is from icmp6, decode it. */ 216 if (d != NULL) { 217 ip6cp = (struct ip6ctlparam *)d; 218 m = ip6cp->ip6c_m; 219 ip6 = ip6cp->ip6c_ip6; 220 off = ip6cp->ip6c_off; 221 cmdarg = ip6cp->ip6c_cmdarg; 222 sa6_src = ip6cp->ip6c_src; 223 } else { 224 m = NULL; 225 ip6 = NULL; 226 cmdarg = NULL; 227 sa6_src = &sa6_any; 228 off = 0; 229 } 230 231 if (ip6) { 232 /* 233 * XXX: We assume that when IPV6 is non NULL, 234 * M and OFF are valid. 235 */ 236 237 /* check if we can safely examine src and dst ports */ 238 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 239 if (cmd == PRC_MSGSIZE) 240 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 241 return NULL; 242 } 243 244 memset(&uh, 0, sizeof(uh)); 245 m_copydata(m, off, sizeof(*uhp), (void *)&uh); 246 247 if (cmd == PRC_MSGSIZE) { 248 int valid = 0; 249 250 /* 251 * Check to see if we have a valid UDP socket 252 * corresponding to the address in the ICMPv6 message 253 * payload. 254 */ 255 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr, 256 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, 257 uh.uh_sport, 0, 0)) 258 valid++; 259 #if 0 260 /* 261 * As the use of sendto(2) is fairly popular, 262 * we may want to allow non-connected pcb too. 263 * But it could be too weak against attacks... 264 * We should at least check if the local address (= s) 265 * is really ours. 266 */ 267 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr, 268 uh.uh_dport, 0)) 269 valid++; 270 #endif 271 272 /* 273 * Depending on the value of "valid" and routing table 274 * size (mtudisc_{hi,lo}wat), we will: 275 * - recalculate the new MTU and create the 276 * corresponding routing entry, or 277 * - ignore the MTU change notification. 278 */ 279 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 280 281 /* 282 * regardless of if we called 283 * icmp6_mtudisc_update(), we need to call 284 * in6_pcbnotify(), to notify path MTU change 285 * to the userland (RFC3542), because some 286 * unconnected sockets may share the same 287 * destination and want to know the path MTU. 288 */ 289 } 290 291 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, 292 (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 293 notify); 294 } else { 295 (void) in6_pcbnotify(&udbtable, sa, 0, 296 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 297 } 298 return NULL; 299 } 300 301 int 302 udp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 303 { 304 int s; 305 int error = 0; 306 int family; 307 308 family = so->so_proto->pr_domain->dom_family; 309 310 s = splsoftnet(); 311 switch (family) { 312 #ifdef INET 313 case PF_INET: 314 if (sopt->sopt_level != IPPROTO_UDP) { 315 error = ip_ctloutput(op, so, sopt); 316 goto end; 317 } 318 break; 319 #endif 320 #ifdef INET6 321 case PF_INET6: 322 if (sopt->sopt_level != IPPROTO_UDP) { 323 error = ip6_ctloutput(op, so, sopt); 324 goto end; 325 } 326 break; 327 #endif 328 default: 329 error = EAFNOSUPPORT; 330 goto end; 331 } 332 error = EINVAL; 333 334 end: 335 splx(s); 336 return error; 337 } 338 339 static void 340 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 341 struct sockaddr *src, struct socket *so) 342 { 343 struct mbuf *opts = NULL; 344 struct mbuf *n; 345 struct in6pcb *in6p = NULL; 346 347 if (!so) 348 return; 349 if (so->so_proto->pr_domain->dom_family != AF_INET6) 350 return; 351 in6p = sotoin6pcb(so); 352 353 #if defined(IPSEC) 354 /* check AH/ESP integrity. */ 355 if (ipsec_used && so != NULL && 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->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, (struct sockaddr *)src, 468 in6p->in6p_socket); 469 rcvcnt++; 470 471 /* 472 * Don't look for additional matches if this one does 473 * not have either the SO_REUSEPORT or SO_REUSEADDR 474 * socket options set. This heuristic avoids searching 475 * through all pcbs in the common case of a non-shared 476 * port. It assumes that an application will never 477 * clear these options after setting them. 478 */ 479 if ((in6p->in6p_socket->so_options & 480 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 481 break; 482 } 483 } else { 484 /* 485 * Locate pcb for datagram. 486 */ 487 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 488 dport, 0, 0); 489 if (in6p == 0) { 490 UDP_STATINC(UDP_STAT_PCBHASHMISS); 491 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 492 if (in6p == 0) 493 return rcvcnt; 494 } 495 496 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 497 rcvcnt++; 498 } 499 500 bad: 501 return rcvcnt; 502 } 503 504 int 505 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 506 { 507 508 /* 509 * XXX it's better to record and check if this mbuf is 510 * already checked. 511 */ 512 513 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 514 goto good; 515 } 516 if (uh->uh_sum == 0) { 517 UDP6_STATINC(UDP6_STAT_NOSUM); 518 goto bad; 519 } 520 521 switch (m->m_pkthdr.csum_flags & 522 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_UDPv6) | 523 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 524 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 525 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 526 UDP6_STATINC(UDP6_STAT_BADSUM); 527 goto bad; 528 529 #if 0 /* notyet */ 530 case M_CSUM_UDPv6|M_CSUM_DATA: 531 #endif 532 533 case M_CSUM_UDPv6: 534 /* Checksum was okay. */ 535 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 536 break; 537 538 default: 539 /* 540 * Need to compute it ourselves. Maybe skip checksum 541 * on loopback interfaces. 542 */ 543 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 544 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 545 UDP6_STATINC(UDP6_STAT_BADSUM); 546 goto bad; 547 } 548 } 549 550 good: 551 return 0; 552 bad: 553 return -1; 554 } 555 556 int 557 udp6_input(struct mbuf **mp, int *offp, int proto) 558 { 559 struct mbuf *m = *mp; 560 int off = *offp; 561 struct sockaddr_in6 src, dst; 562 struct ip6_hdr *ip6; 563 struct udphdr *uh; 564 u_int32_t plen, ulen; 565 566 ip6 = mtod(m, struct ip6_hdr *); 567 568 #if defined(NFAITH) && 0 < NFAITH 569 if (faithprefix(&ip6->ip6_dst)) { 570 /* send icmp6 host unreach? */ 571 m_freem(m); 572 return IPPROTO_DONE; 573 } 574 #endif 575 576 UDP6_STATINC(UDP6_STAT_IPACKETS); 577 578 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 579 plen = m->m_pkthdr.len - off; 580 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 581 if (uh == NULL) { 582 IP6_STATINC(IP6_STAT_TOOSHORT); 583 return IPPROTO_DONE; 584 } 585 KASSERT(UDP_HDR_ALIGNED_P(uh)); 586 ulen = ntohs((u_short)uh->uh_ulen); 587 /* 588 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 589 * iff payload length > 0xffff. 590 */ 591 if (ulen == 0 && plen > 0xffff) 592 ulen = plen; 593 594 if (plen != ulen) { 595 UDP6_STATINC(UDP6_STAT_BADLEN); 596 goto bad; 597 } 598 599 /* destination port of 0 is illegal, based on RFC768. */ 600 if (uh->uh_dport == 0) 601 goto bad; 602 603 /* Be proactive about malicious use of IPv4 mapped address */ 604 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 605 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 606 /* XXX stat */ 607 goto bad; 608 } 609 610 /* 611 * Checksum extended UDP header and data. Maybe skip checksum 612 * on loopback interfaces. 613 */ 614 if (udp6_input_checksum(m, uh, off, ulen)) 615 goto bad; 616 617 /* 618 * Construct source and dst sockaddrs. 619 */ 620 memset(&src, 0, sizeof(src)); 621 src.sin6_family = AF_INET6; 622 src.sin6_len = sizeof(struct sockaddr_in6); 623 src.sin6_addr = ip6->ip6_src; 624 src.sin6_port = uh->uh_sport; 625 memset(&dst, 0, sizeof(dst)); 626 dst.sin6_family = AF_INET6; 627 dst.sin6_len = sizeof(struct sockaddr_in6); 628 dst.sin6_addr = ip6->ip6_dst; 629 dst.sin6_port = uh->uh_dport; 630 631 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 632 if (m->m_flags & M_MCAST) { 633 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 634 goto bad; 635 } 636 UDP6_STATINC(UDP6_STAT_NOPORT); 637 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 638 m = NULL; 639 } 640 641 bad: 642 if (m) 643 m_freem(m); 644 return IPPROTO_DONE; 645 } 646 647 static int 648 udp6_attach(struct socket *so, int proto) 649 { 650 struct in6pcb *in6p; 651 int s, error; 652 653 KASSERT(sotoin6pcb(so) == NULL); 654 sosetlock(so); 655 656 /* 657 * MAPPED_ADDR implementation spec: 658 * Always attach for IPv6, and only when necessary for IPv4. 659 */ 660 s = splsoftnet(); 661 error = in6_pcballoc(so, &udbtable); 662 splx(s); 663 if (error) { 664 return error; 665 } 666 error = soreserve(so, udp6_sendspace, udp6_recvspace); 667 if (error) { 668 return error; 669 } 670 in6p = sotoin6pcb(so); 671 in6p->in6p_cksum = -1; /* just to be sure */ 672 673 KASSERT(solocked(so)); 674 return 0; 675 } 676 677 static void 678 udp6_detach(struct socket *so) 679 { 680 struct in6pcb *in6p = sotoin6pcb(so); 681 int s; 682 683 KASSERT(solocked(so)); 684 KASSERT(in6p != NULL); 685 686 s = splsoftnet(); 687 in6_pcbdetach(in6p); 688 splx(s); 689 } 690 691 static int 692 udp6_accept(struct socket *so, struct sockaddr *nam) 693 { 694 KASSERT(solocked(so)); 695 696 return EOPNOTSUPP; 697 } 698 699 static int 700 udp6_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) 701 { 702 struct in6pcb *in6p = sotoin6pcb(so); 703 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 704 int error = 0; 705 int s; 706 707 KASSERT(solocked(so)); 708 KASSERT(in6p != NULL); 709 710 s = splsoftnet(); 711 error = in6_pcbbind(in6p, sin6, l); 712 splx(s); 713 return error; 714 } 715 716 static int 717 udp6_listen(struct socket *so, struct lwp *l) 718 { 719 KASSERT(solocked(so)); 720 721 return EOPNOTSUPP; 722 } 723 724 static int 725 udp6_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) 726 { 727 struct in6pcb *in6p = sotoin6pcb(so); 728 int error = 0; 729 int s; 730 731 KASSERT(solocked(so)); 732 KASSERT(in6p != NULL); 733 734 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 735 return EISCONN; 736 s = splsoftnet(); 737 error = in6_pcbconnect(in6p, (struct sockaddr_in6 *)nam, l); 738 splx(s); 739 if (error == 0) 740 soisconnected(so); 741 742 return error; 743 } 744 745 static int 746 udp6_connect2(struct socket *so, struct socket *so2) 747 { 748 KASSERT(solocked(so)); 749 750 return EOPNOTSUPP; 751 } 752 753 static int 754 udp6_disconnect(struct socket *so) 755 { 756 struct in6pcb *in6p = sotoin6pcb(so); 757 int s; 758 759 KASSERT(solocked(so)); 760 KASSERT(in6p != NULL); 761 762 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 763 return ENOTCONN; 764 765 s = splsoftnet(); 766 in6_pcbdisconnect(in6p); 767 memset((void *)&in6p->in6p_laddr, 0, sizeof(in6p->in6p_laddr)); 768 splx(s); 769 770 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 771 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 772 return 0; 773 } 774 775 static int 776 udp6_shutdown(struct socket *so) 777 { 778 int s; 779 780 s = splsoftnet(); 781 socantsendmore(so); 782 splx(s); 783 784 return 0; 785 } 786 787 static int 788 udp6_abort(struct socket *so) 789 { 790 int s; 791 792 KASSERT(solocked(so)); 793 KASSERT(sotoin6pcb(so) != NULL); 794 795 s = splsoftnet(); 796 soisdisconnected(so); 797 in6_pcbdetach(sotoin6pcb(so)); 798 splx(s); 799 800 return 0; 801 } 802 803 static int 804 udp6_ioctl(struct socket *so, u_long cmd, void *addr6, struct ifnet *ifp) 805 { 806 /* 807 * MAPPED_ADDR implementation info: 808 * Mapped addr support for PRU_CONTROL is not necessary. 809 * Because typical user of PRU_CONTROL is such as ifconfig, 810 * and they don't associate any addr to their socket. Then 811 * socket family is only hint about the PRU_CONTROL'ed address 812 * family, especially when getting addrs from kernel. 813 * So AF_INET socket need to be used to control AF_INET addrs, 814 * and AF_INET6 socket for AF_INET6 addrs. 815 */ 816 return in6_control(so, cmd, addr6, ifp); 817 } 818 819 static int 820 udp6_stat(struct socket *so, struct stat *ub) 821 { 822 KASSERT(solocked(so)); 823 824 /* stat: don't bother with a blocksize */ 825 return 0; 826 } 827 828 static int 829 udp6_peeraddr(struct socket *so, struct sockaddr *nam) 830 { 831 KASSERT(solocked(so)); 832 KASSERT(sotoin6pcb(so) != NULL); 833 KASSERT(nam != NULL); 834 835 in6_setpeeraddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam); 836 return 0; 837 } 838 839 static int 840 udp6_sockaddr(struct socket *so, struct sockaddr *nam) 841 { 842 KASSERT(solocked(so)); 843 KASSERT(sotoin6pcb(so) != NULL); 844 KASSERT(nam != NULL); 845 846 in6_setsockaddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam); 847 return 0; 848 } 849 850 static int 851 udp6_rcvd(struct socket *so, int flags, struct lwp *l) 852 { 853 KASSERT(solocked(so)); 854 855 return EOPNOTSUPP; 856 } 857 858 static int 859 udp6_recvoob(struct socket *so, struct mbuf *m, int flags) 860 { 861 KASSERT(solocked(so)); 862 863 return EOPNOTSUPP; 864 } 865 866 static int 867 udp6_send(struct socket *so, struct mbuf *m, struct sockaddr *nam, 868 struct mbuf *control, struct lwp *l) 869 { 870 struct in6pcb *in6p = sotoin6pcb(so); 871 int error = 0; 872 int s; 873 874 KASSERT(solocked(so)); 875 KASSERT(in6p != NULL); 876 KASSERT(m != NULL); 877 878 s = splsoftnet(); 879 error = udp6_output(in6p, m, (struct sockaddr_in6 *)nam, control, l); 880 splx(s); 881 882 return error; 883 } 884 885 static int 886 udp6_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) 887 { 888 KASSERT(solocked(so)); 889 890 if (m) 891 m_freem(m); 892 if (control) 893 m_freem(control); 894 895 return EOPNOTSUPP; 896 } 897 898 static int 899 udp6_purgeif(struct socket *so, struct ifnet *ifp) 900 { 901 902 mutex_enter(softnet_lock); 903 in6_pcbpurgeif0(&udbtable, ifp); 904 in6_purgeif(ifp); 905 in6_pcbpurgeif(&udbtable, ifp); 906 mutex_exit(softnet_lock); 907 908 return 0; 909 } 910 911 static int 912 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 913 { 914 915 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 916 } 917 918 static void 919 sysctl_net_inet6_udp6_setup(struct sysctllog **clog) 920 { 921 922 sysctl_createv(clog, 0, NULL, NULL, 923 CTLFLAG_PERMANENT, 924 CTLTYPE_NODE, "inet6", NULL, 925 NULL, 0, NULL, 0, 926 CTL_NET, PF_INET6, CTL_EOL); 927 sysctl_createv(clog, 0, NULL, NULL, 928 CTLFLAG_PERMANENT, 929 CTLTYPE_NODE, "udp6", 930 SYSCTL_DESCR("UDPv6 related settings"), 931 NULL, 0, NULL, 0, 932 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 933 934 sysctl_createv(clog, 0, NULL, NULL, 935 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 936 CTLTYPE_INT, "sendspace", 937 SYSCTL_DESCR("Default UDP send buffer size"), 938 NULL, 0, &udp6_sendspace, 0, 939 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 940 CTL_EOL); 941 sysctl_createv(clog, 0, NULL, NULL, 942 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 943 CTLTYPE_INT, "recvspace", 944 SYSCTL_DESCR("Default UDP receive buffer size"), 945 NULL, 0, &udp6_recvspace, 0, 946 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 947 CTL_EOL); 948 sysctl_createv(clog, 0, NULL, NULL, 949 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 950 CTLTYPE_INT, "do_loopback_cksum", 951 SYSCTL_DESCR("Perform UDP checksum on loopback"), 952 NULL, 0, &udp_do_loopback_cksum, 0, 953 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 954 CTL_EOL); 955 sysctl_createv(clog, 0, NULL, NULL, 956 CTLFLAG_PERMANENT, 957 CTLTYPE_STRUCT, "pcblist", 958 SYSCTL_DESCR("UDP protocol control block list"), 959 sysctl_inpcblist, 0, &udbtable, 0, 960 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 961 CTL_EOL); 962 sysctl_createv(clog, 0, NULL, NULL, 963 CTLFLAG_PERMANENT, 964 CTLTYPE_STRUCT, "stats", 965 SYSCTL_DESCR("UDPv6 statistics"), 966 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 967 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 968 CTL_EOL); 969 } 970 971 void 972 udp6_statinc(u_int stat) 973 { 974 975 KASSERT(stat < UDP6_NSTATS); 976 UDP6_STATINC(stat); 977 } 978 979 PR_WRAP_USRREQS(udp6) 980 #define udp6_attach udp6_attach_wrapper 981 #define udp6_detach udp6_detach_wrapper 982 #define udp6_accept udp6_accept_wrapper 983 #define udp6_bind udp6_bind_wrapper 984 #define udp6_listen udp6_listen_wrapper 985 #define udp6_connect udp6_connect_wrapper 986 #define udp6_connect2 udp6_connect2_wrapper 987 #define udp6_disconnect udp6_disconnect_wrapper 988 #define udp6_shutdown udp6_shutdown_wrapper 989 #define udp6_abort udp6_abort_wrapper 990 #define udp6_ioctl udp6_ioctl_wrapper 991 #define udp6_stat udp6_stat_wrapper 992 #define udp6_peeraddr udp6_peeraddr_wrapper 993 #define udp6_sockaddr udp6_sockaddr_wrapper 994 #define udp6_rcvd udp6_rcvd_wrapper 995 #define udp6_recvoob udp6_recvoob_wrapper 996 #define udp6_send udp6_send_wrapper 997 #define udp6_sendoob udp6_sendoob_wrapper 998 #define udp6_purgeif udp6_purgeif_wrapper 999 1000 const struct pr_usrreqs udp6_usrreqs = { 1001 .pr_attach = udp6_attach, 1002 .pr_detach = udp6_detach, 1003 .pr_accept = udp6_accept, 1004 .pr_bind = udp6_bind, 1005 .pr_listen = udp6_listen, 1006 .pr_connect = udp6_connect, 1007 .pr_connect2 = udp6_connect2, 1008 .pr_disconnect = udp6_disconnect, 1009 .pr_shutdown = udp6_shutdown, 1010 .pr_abort = udp6_abort, 1011 .pr_ioctl = udp6_ioctl, 1012 .pr_stat = udp6_stat, 1013 .pr_peeraddr = udp6_peeraddr, 1014 .pr_sockaddr = udp6_sockaddr, 1015 .pr_rcvd = udp6_rcvd, 1016 .pr_recvoob = udp6_recvoob, 1017 .pr_send = udp6_send, 1018 .pr_sendoob = udp6_sendoob, 1019 .pr_purgeif = udp6_purgeif, 1020 }; 1021
Indexes created Mon Sep 22 13:09:51 GMT 2025