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sys/netinet6/udp6_usrreq.c
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1 /* $NetBSD: udp6_usrreq.c,v 1.154 2022/11/04 09:01:53 ozaki-r Exp $ */ 2 /* $KAME: udp6_usrreq.c,v 1.86 2001/05/27 17:33:00 itojun Exp $ */ 3 /* $KAME: udp6_output.c,v 1.43 2001/10/15 09:19:52 itojun Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1989, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 63 */ 64 65 #include <sys/cdefs.h> 66 __KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.154 2022/11/04 09:01:53 ozaki-r Exp $"); 67 68 #ifdef _KERNEL_OPT 69 #include "opt_inet.h" 70 #include "opt_inet_csum.h" 71 #include "opt_ipsec.h" 72 #include "opt_net_mpsafe.h" 73 #endif 74 75 #include <sys/param.h> 76 #include <sys/mbuf.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/systm.h> 81 #include <sys/proc.h> 82 #include <sys/syslog.h> 83 #include <sys/domain.h> 84 #include <sys/sysctl.h> 85 86 #include <net/if.h> 87 #include <net/if_types.h> 88 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 #include <netinet/in_systm.h> 92 #include <netinet/in_offload.h> 93 #include <netinet/ip.h> 94 #include <netinet/ip_var.h> 95 #include <netinet/in_pcb.h> 96 #include <netinet/udp.h> 97 #include <netinet/udp_var.h> 98 #include <netinet/udp_private.h> 99 100 #include <netinet/ip6.h> 101 #include <netinet/icmp6.h> 102 #include <netinet6/ip6_var.h> 103 #include <netinet6/ip6_private.h> 104 #include <netinet6/in6_pcb.h> 105 #include <netinet6/udp6_var.h> 106 #include <netinet6/udp6_private.h> 107 #include <netinet6/ip6protosw.h> 108 #include <netinet6/scope6_var.h> 109 110 #ifdef IPSEC 111 #include <netipsec/ipsec.h> 112 #include <netipsec/esp.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 inpcb *, int); 138 static void sysctl_net_inet6_udp6_setup(struct sysctllog **); 139 #ifdef IPSEC 140 static int udp6_espinudp(struct mbuf **, int); 141 #endif 142 143 #ifdef UDP_CSUM_COUNTERS 144 #include <sys/device.h> 145 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 146 NULL, "udp6", "hwcsum bad"); 147 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 148 NULL, "udp6", "hwcsum ok"); 149 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 150 NULL, "udp6", "hwcsum data"); 151 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 152 NULL, "udp6", "swcsum"); 153 154 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 155 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 156 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 157 EVCNT_ATTACH_STATIC(udp6_swcsum); 158 159 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 160 #else 161 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 162 #endif 163 164 void 165 udp6_init(void) 166 { 167 sysctl_net_inet6_udp6_setup(NULL); 168 udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS); 169 170 udp_init_common(); 171 } 172 173 /* 174 * Notify a udp user of an asynchronous error; 175 * just wake up so that he can collect error status. 176 */ 177 static void 178 udp6_notify(struct inpcb *inp, int errno) 179 { 180 inp->inp_socket->so_error = errno; 181 sorwakeup(inp->inp_socket); 182 sowwakeup(inp->inp_socket); 183 } 184 185 void * 186 udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 187 { 188 struct udphdr uh; 189 struct ip6_hdr *ip6; 190 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 191 struct mbuf *m; 192 int off; 193 void *cmdarg; 194 struct ip6ctlparam *ip6cp = NULL; 195 const struct sockaddr_in6 *sa6_src = NULL; 196 void (*notify)(struct inpcb *, int) = udp6_notify; 197 struct udp_portonly { 198 u_int16_t uh_sport; 199 u_int16_t uh_dport; 200 } *uhp; 201 202 if (sa->sa_family != AF_INET6 || 203 sa->sa_len != sizeof(struct sockaddr_in6)) 204 return NULL; 205 206 if ((unsigned)cmd >= PRC_NCMDS) 207 return NULL; 208 if (PRC_IS_REDIRECT(cmd)) 209 notify = in6pcb_rtchange, d = NULL; 210 else if (cmd == PRC_HOSTDEAD) 211 d = NULL; 212 else if (cmd == PRC_MSGSIZE) { 213 /* special code is present, see below */ 214 notify = in6pcb_rtchange; 215 } 216 else if (inet6ctlerrmap[cmd] == 0) 217 return NULL; 218 219 /* if the parameter is from icmp6, decode it. */ 220 if (d != NULL) { 221 ip6cp = (struct ip6ctlparam *)d; 222 m = ip6cp->ip6c_m; 223 ip6 = ip6cp->ip6c_ip6; 224 off = ip6cp->ip6c_off; 225 cmdarg = ip6cp->ip6c_cmdarg; 226 sa6_src = ip6cp->ip6c_src; 227 } else { 228 m = NULL; 229 ip6 = NULL; 230 cmdarg = NULL; 231 sa6_src = &sa6_any; 232 off = 0; 233 } 234 235 if (ip6) { 236 /* check if we can safely examine src and dst ports */ 237 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 238 if (cmd == PRC_MSGSIZE) 239 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 240 return NULL; 241 } 242 243 memset(&uh, 0, sizeof(uh)); 244 m_copydata(m, off, sizeof(*uhp), (void *)&uh); 245 246 if (cmd == PRC_MSGSIZE) { 247 int valid = 0; 248 249 /* 250 * Check to see if we have a valid UDP socket 251 * corresponding to the address in the ICMPv6 message 252 * payload. 253 */ 254 if (in6pcb_lookup(&udbtable, &sa6->sin6_addr, 255 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, 256 uh.uh_sport, 0, 0)) 257 valid++; 258 #if 0 259 /* 260 * As the use of sendto(2) is fairly popular, 261 * we may want to allow non-connected pcb too. 262 * But it could be too weak against attacks... 263 * We should at least check if the local address (= s) 264 * is really ours. 265 */ 266 else if (in6pcb_lookup_bound(&udbtable, &sa6->sin6_addr, 267 uh.uh_dport, 0)) 268 valid++; 269 #endif 270 271 /* 272 * Depending on the value of "valid" and routing table 273 * size (mtudisc_{hi,lo}wat), we will: 274 * - recalculate the new MTU and create the 275 * corresponding routing entry, or 276 * - ignore the MTU change notification. 277 */ 278 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 279 280 /* 281 * regardless of if we called 282 * icmp6_mtudisc_update(), we need to call 283 * in6pcb_notify(), to notify path MTU change 284 * to the userland (RFC3542), because some 285 * unconnected sockets may share the same 286 * destination and want to know the path MTU. 287 */ 288 } 289 290 (void)in6pcb_notify(&udbtable, sa, uh.uh_dport, 291 sin6tocsa(sa6_src), uh.uh_sport, cmd, cmdarg, 292 notify); 293 } else { 294 (void)in6pcb_notify(&udbtable, sa, 0, 295 sin6tocsa(sa6_src), 0, cmd, cmdarg, notify); 296 } 297 return NULL; 298 } 299 300 int 301 udp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 302 { 303 int s; 304 int error = 0; 305 struct inpcb *inp; 306 int family; 307 int optval; 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 } 333 334 switch (op) { 335 case PRCO_SETOPT: 336 inp = sotoinpcb(so); 337 338 switch (sopt->sopt_name) { 339 case UDP_ENCAP: 340 error = sockopt_getint(sopt, &optval); 341 if (error) 342 break; 343 344 switch(optval) { 345 case 0: 346 inp->inp_flags &= ~IN6P_ESPINUDP; 347 break; 348 349 case UDP_ENCAP_ESPINUDP: 350 inp->inp_flags |= IN6P_ESPINUDP; 351 break; 352 353 default: 354 error = EINVAL; 355 break; 356 } 357 break; 358 359 default: 360 error = ENOPROTOOPT; 361 break; 362 } 363 break; 364 365 default: 366 error = EINVAL; 367 break; 368 } 369 370 end: 371 splx(s); 372 return error; 373 } 374 375 static void 376 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 377 struct sockaddr *src, struct socket *so) 378 { 379 struct mbuf *opts = NULL; 380 struct mbuf *n; 381 struct inpcb *inp; 382 383 KASSERT(so != NULL); 384 KASSERT(so->so_proto->pr_domain->dom_family == AF_INET6); 385 inp = sotoinpcb(so); 386 KASSERT(inp != NULL); 387 388 #if defined(IPSEC) 389 if (ipsec_used && ipsec_in_reject(m, inp)) { 390 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 391 icmp6_error(n, ICMP6_DST_UNREACH, 392 ICMP6_DST_UNREACH_ADMIN, 0); 393 return; 394 } 395 #endif 396 397 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 398 if (inp->inp_flags & IN6P_CONTROLOPTS || 399 SOOPT_TIMESTAMP(inp->inp_socket->so_options)) { 400 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 401 ip6_savecontrol(inp, &opts, ip6, n); 402 } 403 404 m_adj(n, off); 405 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 406 m_freem(n); 407 if (opts) 408 m_freem(opts); 409 UDP6_STATINC(UDP6_STAT_FULLSOCK); 410 soroverflow(so); 411 } else 412 sorwakeup(so); 413 } 414 } 415 416 int 417 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 418 struct mbuf **mp, int off) 419 { 420 u_int16_t sport, dport; 421 int rcvcnt; 422 struct in6_addr src6, *dst6; 423 const struct in_addr *dst4; 424 struct inpcb *inp; 425 struct mbuf *m = *mp; 426 427 rcvcnt = 0; 428 off += sizeof(struct udphdr); /* now, offset of payload */ 429 430 if (af != AF_INET && af != AF_INET6) 431 goto bad; 432 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 433 goto bad; 434 435 src6 = src->sin6_addr; 436 if (sa6_recoverscope(src) != 0) { 437 /* XXX: should be impossible. */ 438 goto bad; 439 } 440 sport = src->sin6_port; 441 442 dport = dst->sin6_port; 443 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 444 dst6 = &dst->sin6_addr; 445 446 if (IN6_IS_ADDR_MULTICAST(dst6) || 447 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 448 /* 449 * Deliver a multicast or broadcast datagram to *all* sockets 450 * for which the local and remote addresses and ports match 451 * those of the incoming datagram. This allows more than 452 * one process to receive multi/broadcasts on the same port. 453 * (This really ought to be done for unicast datagrams as 454 * well, but that would cause problems with existing 455 * applications that open both address-specific sockets and 456 * a wildcard socket listening to the same port -- they would 457 * end up receiving duplicates of every unicast datagram. 458 * Those applications open the multiple sockets to overcome an 459 * inadequacy of the UDP socket interface, but for backwards 460 * compatibility we avoid the problem here rather than 461 * fixing the interface. Maybe 4.5BSD will remedy this?) 462 */ 463 464 /* 465 * KAME note: traditionally we dropped udpiphdr from mbuf here. 466 * we need udpiphdr for IPsec processing so we do that later. 467 */ 468 /* 469 * Locate pcb(s) for datagram. 470 */ 471 TAILQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) { 472 if (inp->inp_af != AF_INET6) 473 continue; 474 475 if (inp->inp_lport != dport) 476 continue; 477 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_laddr(inp))) { 478 if (!IN6_ARE_ADDR_EQUAL(&in6p_laddr(inp), 479 dst6)) 480 continue; 481 } else { 482 if (IN6_IS_ADDR_V4MAPPED(dst6) && 483 (inp->inp_flags & IN6P_IPV6_V6ONLY)) 484 continue; 485 } 486 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_faddr(inp))) { 487 if (!IN6_ARE_ADDR_EQUAL(&in6p_faddr(inp), 488 &src6) || inp->inp_fport != sport) 489 continue; 490 } else { 491 if (IN6_IS_ADDR_V4MAPPED(&src6) && 492 (inp->inp_flags & IN6P_IPV6_V6ONLY)) 493 continue; 494 } 495 496 udp6_sendup(m, off, sin6tosa(src), inp->inp_socket); 497 rcvcnt++; 498 499 /* 500 * Don't look for additional matches if this one does 501 * not have either the SO_REUSEPORT or SO_REUSEADDR 502 * socket options set. This heuristic avoids searching 503 * through all pcbs in the common case of a non-shared 504 * port. It assumes that an application will never 505 * clear these options after setting them. 506 */ 507 if ((inp->inp_socket->so_options & 508 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 509 break; 510 } 511 } else { 512 /* 513 * Locate pcb for datagram. 514 */ 515 inp = in6pcb_lookup(&udbtable, &src6, sport, dst6, 516 dport, 0, 0); 517 if (inp == NULL) { 518 UDP_STATINC(UDP_STAT_PCBHASHMISS); 519 inp = in6pcb_lookup_bound(&udbtable, dst6, dport, 0); 520 if (inp == NULL) 521 return rcvcnt; 522 } 523 524 #ifdef IPSEC 525 /* Handle ESP over UDP */ 526 if (inp->inp_flags & IN6P_ESPINUDP) { 527 switch (udp6_espinudp(mp, off)) { 528 case -1: /* Error, m was freed */ 529 rcvcnt = -1; 530 goto bad; 531 532 case 1: /* ESP over UDP */ 533 rcvcnt++; 534 goto bad; 535 536 case 0: /* plain UDP */ 537 default: /* Unexpected */ 538 /* 539 * Normal UDP processing will take place, 540 * m may have changed. 541 */ 542 m = *mp; 543 break; 544 } 545 } 546 #endif 547 548 if (inp->inp_overudp_cb != NULL) { 549 int ret; 550 ret = inp->inp_overudp_cb(mp, off, inp->inp_socket, 551 sin6tosa(src), inp->inp_overudp_arg); 552 switch (ret) { 553 case -1: /* Error, m was freed */ 554 rcvcnt = -1; 555 goto bad; 556 557 case 1: /* Foo over UDP */ 558 KASSERT(*mp == NULL); 559 rcvcnt++; 560 goto bad; 561 562 case 0: /* plain UDP */ 563 default: /* Unexpected */ 564 /* 565 * Normal UDP processing will take place, 566 * m may have changed. 567 */ 568 break; 569 } 570 } 571 572 udp6_sendup(m, off, sin6tosa(src), inp->inp_socket); 573 rcvcnt++; 574 } 575 576 bad: 577 return rcvcnt; 578 } 579 580 int 581 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 582 { 583 584 /* 585 * XXX it's better to record and check if this mbuf is 586 * already checked. 587 */ 588 589 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 590 goto good; 591 } 592 if (uh->uh_sum == 0) { 593 UDP6_STATINC(UDP6_STAT_NOSUM); 594 goto bad; 595 } 596 597 switch (m->m_pkthdr.csum_flags & 598 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_UDPv6) | 599 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 600 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 601 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 602 UDP6_STATINC(UDP6_STAT_BADSUM); 603 goto bad; 604 605 #if 0 /* notyet */ 606 case M_CSUM_UDPv6|M_CSUM_DATA: 607 #endif 608 609 case M_CSUM_UDPv6: 610 /* Checksum was okay. */ 611 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 612 break; 613 614 default: 615 /* 616 * Need to compute it ourselves. Maybe skip checksum 617 * on loopback interfaces. 618 */ 619 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 620 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 621 UDP6_STATINC(UDP6_STAT_BADSUM); 622 goto bad; 623 } 624 } 625 626 good: 627 return 0; 628 bad: 629 return -1; 630 } 631 632 int 633 udp6_input(struct mbuf **mp, int *offp, int proto) 634 { 635 struct mbuf *m = *mp; 636 int off = *offp; 637 struct sockaddr_in6 src, dst; 638 struct ip6_hdr *ip6; 639 struct udphdr *uh; 640 u_int32_t plen, ulen; 641 642 ip6 = mtod(m, struct ip6_hdr *); 643 644 #if defined(NFAITH) && 0 < NFAITH 645 if (faithprefix(&ip6->ip6_dst)) { 646 /* send icmp6 host unreach? */ 647 m_freem(m); 648 return IPPROTO_DONE; 649 } 650 #endif 651 652 UDP6_STATINC(UDP6_STAT_IPACKETS); 653 654 /* Check for jumbogram is done in ip6_input. We can trust pkthdr.len. */ 655 plen = m->m_pkthdr.len - off; 656 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 657 if (uh == NULL) { 658 IP6_STATINC(IP6_STAT_TOOSHORT); 659 return IPPROTO_DONE; 660 } 661 662 /* 663 * Enforce alignment requirements that are violated in 664 * some cases, see kern/50766 for details. 665 */ 666 if (ACCESSIBLE_POINTER(uh, struct udphdr) == 0) { 667 m = m_copyup(m, off + sizeof(struct udphdr), 0); 668 if (m == NULL) { 669 IP6_STATINC(IP6_STAT_TOOSHORT); 670 return IPPROTO_DONE; 671 } 672 ip6 = mtod(m, struct ip6_hdr *); 673 uh = (struct udphdr *)(mtod(m, char *) + off); 674 } 675 KASSERT(ACCESSIBLE_POINTER(uh, struct udphdr)); 676 ulen = ntohs((u_short)uh->uh_ulen); 677 678 /* 679 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 680 * iff payload length > 0xffff. 681 */ 682 if (ulen == 0 && plen > 0xffff) 683 ulen = plen; 684 685 if (plen != ulen) { 686 UDP6_STATINC(UDP6_STAT_BADLEN); 687 goto bad; 688 } 689 690 /* destination port of 0 is illegal, based on RFC768. */ 691 if (uh->uh_dport == 0) 692 goto bad; 693 694 /* 695 * Checksum extended UDP header and data. Maybe skip checksum 696 * on loopback interfaces. 697 */ 698 if (udp6_input_checksum(m, uh, off, ulen)) 699 goto bad; 700 701 /* 702 * Construct source and dst sockaddrs. 703 */ 704 memset(&src, 0, sizeof(src)); 705 src.sin6_family = AF_INET6; 706 src.sin6_len = sizeof(struct sockaddr_in6); 707 src.sin6_addr = ip6->ip6_src; 708 src.sin6_port = uh->uh_sport; 709 memset(&dst, 0, sizeof(dst)); 710 dst.sin6_family = AF_INET6; 711 dst.sin6_len = sizeof(struct sockaddr_in6); 712 dst.sin6_addr = ip6->ip6_dst; 713 dst.sin6_port = uh->uh_dport; 714 715 if (udp6_realinput(AF_INET6, &src, &dst, &m, off) == 0) { 716 if (m->m_flags & M_MCAST) { 717 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 718 goto bad; 719 } 720 UDP6_STATINC(UDP6_STAT_NOPORT); 721 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 722 m = NULL; 723 } 724 725 bad: 726 if (m) 727 m_freem(m); 728 return IPPROTO_DONE; 729 } 730 731 int 732 udp6_output(struct inpcb * const inp, struct mbuf *m, 733 struct sockaddr_in6 * const addr6, struct mbuf * const control, 734 struct lwp * const l) 735 { 736 u_int32_t ulen = m->m_pkthdr.len; 737 u_int32_t plen = sizeof(struct udphdr) + ulen; 738 struct ip6_hdr *ip6; 739 struct udphdr *udp6; 740 struct in6_addr _laddr, *laddr, *faddr; 741 struct in6_addr laddr_mapped; /* XXX ugly */ 742 struct sockaddr_in6 *sin6 = NULL; 743 struct ifnet *oifp = NULL; 744 int scope_ambiguous = 0; 745 u_int16_t fport; 746 int error = 0; 747 struct ip6_pktopts *optp = NULL; 748 struct ip6_pktopts opt; 749 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 750 #ifdef INET 751 struct ip *ip; 752 struct udpiphdr *ui; 753 int flags = 0; 754 #endif 755 struct sockaddr_in6 tmp; 756 757 if (addr6) { 758 sin6 = addr6; 759 if (sin6->sin6_len != sizeof(*sin6)) { 760 error = EINVAL; 761 goto release; 762 } 763 if (sin6->sin6_family != AF_INET6) { 764 error = EAFNOSUPPORT; 765 goto release; 766 } 767 768 /* protect *sin6 from overwrites */ 769 tmp = *sin6; 770 sin6 = &tmp; 771 772 /* 773 * Application should provide a proper zone ID or the use of 774 * default zone IDs should be enabled. Unfortunately, some 775 * applications do not behave as it should, so we need a 776 * workaround. Even if an appropriate ID is not determined, 777 * we'll see if we can determine the outgoing interface. If we 778 * can, determine the zone ID based on the interface below. 779 */ 780 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 781 scope_ambiguous = 1; 782 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 783 goto release; 784 } 785 786 if (control) { 787 if (__predict_false(l == NULL)) { 788 panic("%s: control but no lwp", __func__); 789 } 790 if ((error = ip6_setpktopts(control, &opt, 791 in6p_outputopts(inp), l->l_cred, IPPROTO_UDP)) != 0) 792 goto release; 793 optp = &opt; 794 } else 795 optp = in6p_outputopts(inp); 796 797 798 if (sin6) { 799 /* 800 * Slightly different than v4 version in that we call 801 * in6_selectsrc and in6pcb_set_port to fill in the local 802 * address and port rather than inpcb_connect. inpcb_connect 803 * sets inp_faddr which causes EISCONN below to be hit on 804 * subsequent sendto. 805 */ 806 if (sin6->sin6_port == 0) { 807 error = EADDRNOTAVAIL; 808 goto release; 809 } 810 811 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_faddr(inp))) { 812 /* how about ::ffff:0.0.0.0 case? */ 813 error = EISCONN; 814 goto release; 815 } 816 817 faddr = &sin6->sin6_addr; 818 fport = sin6->sin6_port; /* allow 0 port */ 819 820 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 821 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 822 /* 823 * I believe we should explicitly discard the 824 * packet when mapped addresses are disabled, 825 * rather than send the packet as an IPv6 one. 826 * If we chose the latter approach, the packet 827 * might be sent out on the wire based on the 828 * default route, the situation which we'd 829 * probably want to avoid. 830 * (20010421 jinmei@kame.net) 831 */ 832 error = EINVAL; 833 goto release; 834 } 835 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_laddr(inp)) && 836 !IN6_IS_ADDR_V4MAPPED(&in6p_laddr(inp))) { 837 /* 838 * when remote addr is an IPv4-mapped address, 839 * local addr should not be an IPv6 address, 840 * since you cannot determine how to map IPv6 841 * source address to IPv4. 842 */ 843 error = EINVAL; 844 goto release; 845 } 846 847 af = AF_INET; 848 } 849 850 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 851 struct psref psref; 852 int bound = curlwp_bind(); 853 854 error = in6_selectsrc(sin6, optp, 855 in6p_moptions(inp), 856 &inp->inp_route, 857 &in6p_laddr(inp), &oifp, &psref, &_laddr); 858 if (error) 859 laddr = NULL; 860 else 861 laddr = &_laddr; 862 if (oifp && scope_ambiguous && 863 (error = in6_setscope(&sin6->sin6_addr, 864 oifp, NULL))) { 865 if_put(oifp, &psref); 866 curlwp_bindx(bound); 867 goto release; 868 } 869 if_put(oifp, &psref); 870 curlwp_bindx(bound); 871 } else { 872 /* 873 * XXX: freebsd[34] does not have in_selectsrc, but 874 * we can omit the whole part because freebsd4 calls 875 * udp_output() directly in this case, and thus we'll 876 * never see this path. 877 */ 878 if (IN6_IS_ADDR_UNSPECIFIED(&in6p_laddr(inp))) { 879 struct sockaddr_in sin_dst; 880 struct in_addr ina; 881 struct in_ifaddr *ia4; 882 struct psref _psref; 883 int bound; 884 885 memcpy(&ina, &faddr->s6_addr[12], sizeof(ina)); 886 sockaddr_in_init(&sin_dst, &ina, 0); 887 bound = curlwp_bind(); 888 ia4 = in_selectsrc(&sin_dst, &inp->inp_route, 889 inp->inp_socket->so_options, NULL, 890 &error, &_psref); 891 if (ia4 == NULL) { 892 curlwp_bindx(bound); 893 if (error == 0) 894 error = EADDRNOTAVAIL; 895 goto release; 896 } 897 memset(&laddr_mapped, 0, sizeof(laddr_mapped)); 898 laddr_mapped.s6_addr16[5] = 0xffff; /* ugly */ 899 memcpy(&laddr_mapped.s6_addr[12], 900 &IA_SIN(ia4)->sin_addr, 901 sizeof(IA_SIN(ia4)->sin_addr)); 902 ia4_release(ia4, &_psref); 903 curlwp_bindx(bound); 904 laddr = &laddr_mapped; 905 } else 906 { 907 laddr = &in6p_laddr(inp); /* XXX */ 908 } 909 } 910 if (laddr == NULL) { 911 if (error == 0) 912 error = EADDRNOTAVAIL; 913 goto release; 914 } 915 if (inp->inp_lport == 0) { 916 /* 917 * Craft a sockaddr_in6 for the local endpoint. Use the 918 * "any" as a base, set the address, and recover the 919 * scope. 920 */ 921 struct sockaddr_in6 lsin6 = 922 *((const struct sockaddr_in6 *)inp->inp_socket->so_proto->pr_domain->dom_sa_any); 923 lsin6.sin6_addr = *laddr; 924 error = sa6_recoverscope(&lsin6); 925 if (error) 926 goto release; 927 928 error = in6pcb_set_port(&lsin6, inp, l); 929 930 if (error) { 931 in6p_laddr(inp) = in6addr_any; 932 goto release; 933 } 934 } 935 } else { 936 if (IN6_IS_ADDR_UNSPECIFIED(&in6p_faddr(inp))) { 937 error = ENOTCONN; 938 goto release; 939 } 940 if (IN6_IS_ADDR_V4MAPPED(&in6p_faddr(inp))) { 941 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) 942 { 943 /* 944 * XXX: this case would happen when the 945 * application sets the V6ONLY flag after 946 * connecting the foreign address. 947 * Such applications should be fixed, 948 * so we bark here. 949 */ 950 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 951 "option was set for a connected socket\n"); 952 error = EINVAL; 953 goto release; 954 } else 955 af = AF_INET; 956 } 957 laddr = &in6p_laddr(inp); 958 faddr = &in6p_faddr(inp); 959 fport = inp->inp_fport; 960 } 961 962 if (af == AF_INET) 963 hlen = sizeof(struct ip); 964 965 /* 966 * Calculate data length and get a mbuf 967 * for UDP and IP6 headers. 968 */ 969 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 970 if (m == NULL) { 971 error = ENOBUFS; 972 goto release; 973 } 974 975 /* 976 * Stuff checksum and output datagram. 977 */ 978 udp6 = (struct udphdr *)(mtod(m, char *) + hlen); 979 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 980 udp6->uh_dport = fport; 981 if (plen <= 0xffff) 982 udp6->uh_ulen = htons((u_int16_t)plen); 983 else 984 udp6->uh_ulen = 0; 985 udp6->uh_sum = 0; 986 987 switch (af) { 988 case AF_INET6: 989 ip6 = mtod(m, struct ip6_hdr *); 990 ip6->ip6_flow = in6p_flowinfo(inp) & IPV6_FLOWINFO_MASK; 991 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 992 ip6->ip6_vfc |= IPV6_VERSION; 993 #if 0 /* ip6_plen will be filled in ip6_output. */ 994 ip6->ip6_plen = htons((u_int16_t)plen); 995 #endif 996 ip6->ip6_nxt = IPPROTO_UDP; 997 ip6->ip6_hlim = in6pcb_selecthlim_rt(inp); 998 ip6->ip6_src = *laddr; 999 ip6->ip6_dst = *faddr; 1000 1001 udp6->uh_sum = in6_cksum_phdr(laddr, faddr, 1002 htonl(plen), htonl(IPPROTO_UDP)); 1003 m->m_pkthdr.csum_flags = M_CSUM_UDPv6; 1004 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1005 1006 UDP6_STATINC(UDP6_STAT_OPACKETS); 1007 error = ip6_output(m, optp, &inp->inp_route, 0, 1008 in6p_moptions(inp), inp, NULL); 1009 break; 1010 case AF_INET: 1011 #ifdef INET 1012 /* can't transmit jumbogram over IPv4 */ 1013 if (plen > 0xffff) { 1014 error = EMSGSIZE; 1015 goto release; 1016 } 1017 1018 ip = mtod(m, struct ip *); 1019 ui = (struct udpiphdr *)ip; 1020 memset(ui->ui_x1, 0, sizeof(ui->ui_x1)); 1021 ui->ui_pr = IPPROTO_UDP; 1022 ui->ui_len = htons(plen); 1023 memcpy(&ui->ui_src, &laddr->s6_addr[12], sizeof(ui->ui_src)); 1024 ui->ui_ulen = ui->ui_len; 1025 1026 flags = (inp->inp_socket->so_options & 1027 (SO_DONTROUTE | SO_BROADCAST)); 1028 memcpy(&ui->ui_dst, &faddr->s6_addr[12], sizeof(ui->ui_dst)); 1029 1030 udp6->uh_sum = in_cksum(m, hlen + plen); 1031 if (udp6->uh_sum == 0) 1032 udp6->uh_sum = 0xffff; 1033 1034 ip->ip_len = htons(hlen + plen); 1035 ip->ip_ttl = in6pcb_selecthlim(inp, NULL); /* XXX */ 1036 ip->ip_tos = 0; /* XXX */ 1037 1038 UDP_STATINC(UDP_STAT_OPACKETS); 1039 error = ip_output(m, NULL, &inp->inp_route, flags /* XXX */, 1040 inp->inp_moptions, NULL); 1041 break; 1042 #else 1043 error = EAFNOSUPPORT; 1044 goto release; 1045 #endif 1046 } 1047 goto releaseopt; 1048 1049 release: 1050 m_freem(m); 1051 1052 releaseopt: 1053 if (control) { 1054 if (optp == &opt) 1055 ip6_clearpktopts(&opt, -1); 1056 m_freem(control); 1057 } 1058 return (error); 1059 } 1060 1061 static int 1062 udp6_attach(struct socket *so, int proto) 1063 { 1064 struct inpcb *inp; 1065 int s, error; 1066 1067 KASSERT(sotoinpcb(so) == NULL); 1068 sosetlock(so); 1069 1070 error = soreserve(so, udp6_sendspace, udp6_recvspace); 1071 if (error) { 1072 return error; 1073 } 1074 1075 /* 1076 * MAPPED_ADDR implementation spec: 1077 * Always attach for IPv6, and only when necessary for IPv4. 1078 */ 1079 s = splsoftnet(); 1080 error = inpcb_create(so, &udbtable); 1081 splx(s); 1082 if (error) { 1083 return error; 1084 } 1085 1086 inp = sotoinpcb(so); 1087 in6p_cksum(inp) = -1; /* just to be sure */ 1088 1089 KASSERT(solocked(so)); 1090 return 0; 1091 } 1092 1093 static void 1094 udp6_detach(struct socket *so) 1095 { 1096 struct inpcb *inp = sotoinpcb(so); 1097 int s; 1098 1099 KASSERT(solocked(so)); 1100 KASSERT(inp != NULL); 1101 1102 s = splsoftnet(); 1103 inpcb_destroy(inp); 1104 splx(s); 1105 } 1106 1107 static int 1108 udp6_accept(struct socket *so, struct sockaddr *nam) 1109 { 1110 KASSERT(solocked(so)); 1111 1112 return EOPNOTSUPP; 1113 } 1114 1115 static int 1116 udp6_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) 1117 { 1118 struct inpcb *inp = sotoinpcb(so); 1119 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1120 int error = 0; 1121 int s; 1122 1123 KASSERT(solocked(so)); 1124 KASSERT(inp != NULL); 1125 1126 s = splsoftnet(); 1127 error = in6pcb_bind(inp, sin6, l); 1128 splx(s); 1129 return error; 1130 } 1131 1132 static int 1133 udp6_listen(struct socket *so, struct lwp *l) 1134 { 1135 KASSERT(solocked(so)); 1136 1137 return EOPNOTSUPP; 1138 } 1139 1140 static int 1141 udp6_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) 1142 { 1143 struct inpcb *inp = sotoinpcb(so); 1144 int error = 0; 1145 int s; 1146 1147 KASSERT(solocked(so)); 1148 KASSERT(inp != NULL); 1149 1150 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_faddr(inp))) 1151 return EISCONN; 1152 s = splsoftnet(); 1153 error = in6pcb_connect(inp, (struct sockaddr_in6 *)nam, l); 1154 splx(s); 1155 if (error == 0) 1156 soisconnected(so); 1157 1158 return error; 1159 } 1160 1161 static int 1162 udp6_connect2(struct socket *so, struct socket *so2) 1163 { 1164 KASSERT(solocked(so)); 1165 1166 return EOPNOTSUPP; 1167 } 1168 1169 static int 1170 udp6_disconnect(struct socket *so) 1171 { 1172 struct inpcb *inp = sotoinpcb(so); 1173 int s; 1174 1175 KASSERT(solocked(so)); 1176 KASSERT(inp != NULL); 1177 1178 if (IN6_IS_ADDR_UNSPECIFIED(&in6p_faddr(inp))) 1179 return ENOTCONN; 1180 1181 s = splsoftnet(); 1182 in6pcb_disconnect(inp); 1183 memset((void *)&in6p_laddr(inp), 0, sizeof(in6p_laddr(inp))); 1184 splx(s); 1185 1186 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1187 in6pcb_set_state(inp, INP_BOUND); /* XXX */ 1188 return 0; 1189 } 1190 1191 static int 1192 udp6_shutdown(struct socket *so) 1193 { 1194 int s; 1195 1196 s = splsoftnet(); 1197 socantsendmore(so); 1198 splx(s); 1199 1200 return 0; 1201 } 1202 1203 static int 1204 udp6_abort(struct socket *so) 1205 { 1206 int s; 1207 1208 KASSERT(solocked(so)); 1209 KASSERT(sotoinpcb(so) != NULL); 1210 1211 s = splsoftnet(); 1212 soisdisconnected(so); 1213 inpcb_destroy(sotoinpcb(so)); 1214 splx(s); 1215 1216 return 0; 1217 } 1218 1219 static int 1220 udp6_ioctl(struct socket *so, u_long cmd, void *addr6, struct ifnet *ifp) 1221 { 1222 /* 1223 * MAPPED_ADDR implementation info: 1224 * Mapped addr support for PRU_CONTROL is not necessary. 1225 * Because typical user of PRU_CONTROL is such as ifconfig, 1226 * and they don't associate any addr to their socket. Then 1227 * socket family is only hint about the PRU_CONTROL'ed address 1228 * family, especially when getting addrs from kernel. 1229 * So AF_INET socket need to be used to control AF_INET addrs, 1230 * and AF_INET6 socket for AF_INET6 addrs. 1231 */ 1232 return in6_control(so, cmd, addr6, ifp); 1233 } 1234 1235 static int 1236 udp6_stat(struct socket *so, struct stat *ub) 1237 { 1238 KASSERT(solocked(so)); 1239 1240 /* stat: don't bother with a blocksize */ 1241 return 0; 1242 } 1243 1244 static int 1245 udp6_peeraddr(struct socket *so, struct sockaddr *nam) 1246 { 1247 KASSERT(solocked(so)); 1248 KASSERT(sotoinpcb(so) != NULL); 1249 KASSERT(nam != NULL); 1250 1251 in6pcb_fetch_peeraddr(sotoinpcb(so), (struct sockaddr_in6 *)nam); 1252 return 0; 1253 } 1254 1255 static int 1256 udp6_sockaddr(struct socket *so, struct sockaddr *nam) 1257 { 1258 KASSERT(solocked(so)); 1259 KASSERT(sotoinpcb(so) != NULL); 1260 KASSERT(nam != NULL); 1261 1262 in6pcb_fetch_sockaddr(sotoinpcb(so), (struct sockaddr_in6 *)nam); 1263 return 0; 1264 } 1265 1266 static int 1267 udp6_rcvd(struct socket *so, int flags, struct lwp *l) 1268 { 1269 KASSERT(solocked(so)); 1270 1271 return EOPNOTSUPP; 1272 } 1273 1274 static int 1275 udp6_recvoob(struct socket *so, struct mbuf *m, int flags) 1276 { 1277 KASSERT(solocked(so)); 1278 1279 return EOPNOTSUPP; 1280 } 1281 1282 static int 1283 udp6_send(struct socket *so, struct mbuf *m, struct sockaddr *nam, 1284 struct mbuf *control, struct lwp *l) 1285 { 1286 struct inpcb *inp = sotoinpcb(so); 1287 int error = 0; 1288 int s; 1289 1290 KASSERT(solocked(so)); 1291 KASSERT(inp != NULL); 1292 KASSERT(m != NULL); 1293 1294 s = splsoftnet(); 1295 error = udp6_output(inp, m, (struct sockaddr_in6 *)nam, control, l); 1296 splx(s); 1297 1298 return error; 1299 } 1300 1301 static int 1302 udp6_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) 1303 { 1304 KASSERT(solocked(so)); 1305 1306 m_freem(m); 1307 m_freem(control); 1308 1309 return EOPNOTSUPP; 1310 } 1311 1312 static int 1313 udp6_purgeif(struct socket *so, struct ifnet *ifp) 1314 { 1315 1316 mutex_enter(softnet_lock); 1317 in6pcb_purgeif0(&udbtable, ifp); 1318 #ifdef NET_MPSAFE 1319 mutex_exit(softnet_lock); 1320 #endif 1321 in6_purgeif(ifp); 1322 #ifdef NET_MPSAFE 1323 mutex_enter(softnet_lock); 1324 #endif 1325 in6pcb_purgeif(&udbtable, ifp); 1326 mutex_exit(softnet_lock); 1327 1328 return 0; 1329 } 1330 1331 static int 1332 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 1333 { 1334 1335 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 1336 } 1337 1338 static void 1339 sysctl_net_inet6_udp6_setup(struct sysctllog **clog) 1340 { 1341 1342 sysctl_createv(clog, 0, NULL, NULL, 1343 CTLFLAG_PERMANENT, 1344 CTLTYPE_NODE, "inet6", NULL, 1345 NULL, 0, NULL, 0, 1346 CTL_NET, PF_INET6, CTL_EOL); 1347 sysctl_createv(clog, 0, NULL, NULL, 1348 CTLFLAG_PERMANENT, 1349 CTLTYPE_NODE, "udp6", 1350 SYSCTL_DESCR("UDPv6 related settings"), 1351 NULL, 0, NULL, 0, 1352 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 1353 1354 sysctl_createv(clog, 0, NULL, NULL, 1355 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1356 CTLTYPE_INT, "sendspace", 1357 SYSCTL_DESCR("Default UDP send buffer size"), 1358 NULL, 0, &udp6_sendspace, 0, 1359 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 1360 CTL_EOL); 1361 sysctl_createv(clog, 0, NULL, NULL, 1362 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1363 CTLTYPE_INT, "recvspace", 1364 SYSCTL_DESCR("Default UDP receive buffer size"), 1365 NULL, 0, &udp6_recvspace, 0, 1366 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 1367 CTL_EOL); 1368 sysctl_createv(clog, 0, NULL, NULL, 1369 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1370 CTLTYPE_INT, "do_loopback_cksum", 1371 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1372 NULL, 0, &udp_do_loopback_cksum, 0, 1373 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 1374 CTL_EOL); 1375 sysctl_createv(clog, 0, NULL, NULL, 1376 CTLFLAG_PERMANENT, 1377 CTLTYPE_STRUCT, "pcblist", 1378 SYSCTL_DESCR("UDP protocol control block list"), 1379 sysctl_inpcblist, 0, &udbtable, 0, 1380 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 1381 CTL_EOL); 1382 sysctl_createv(clog, 0, NULL, NULL, 1383 CTLFLAG_PERMANENT, 1384 CTLTYPE_STRUCT, "stats", 1385 SYSCTL_DESCR("UDPv6 statistics"), 1386 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 1387 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 1388 CTL_EOL); 1389 } 1390 1391 void 1392 udp6_statinc(u_int stat) 1393 { 1394 1395 KASSERT(stat < UDP6_NSTATS); 1396 UDP6_STATINC(stat); 1397 } 1398 1399 #ifdef IPSEC 1400 /* 1401 * Returns: 1402 * 1 if the packet was processed 1403 * 0 if normal UDP processing should take place 1404 * -1 if an error occurred and m was freed 1405 */ 1406 static int 1407 udp6_espinudp(struct mbuf **mp, int off) 1408 { 1409 const size_t skip = sizeof(struct udphdr); 1410 size_t len; 1411 void *data; 1412 size_t minlen; 1413 int ip6hdrlen; 1414 struct ip6_hdr *ip6; 1415 struct m_tag *tag; 1416 struct udphdr *udphdr; 1417 u_int16_t sport, dport; 1418 struct mbuf *m = *mp; 1419 uint32_t *marker; 1420 1421 /* 1422 * Collapse the mbuf chain if the first mbuf is too short 1423 * The longest case is: UDP + non ESP marker + ESP 1424 */ 1425 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1426 if (minlen > m->m_pkthdr.len) 1427 minlen = m->m_pkthdr.len; 1428 1429 if (m->m_len < minlen) { 1430 if ((*mp = m_pullup(m, minlen)) == NULL) { 1431 return -1; 1432 } 1433 m = *mp; 1434 } 1435 1436 len = m->m_len - off; 1437 data = mtod(m, char *) + off; 1438 1439 /* Ignore keepalive packets */ 1440 if ((len == 1) && (*(unsigned char *)data == 0xff)) { 1441 m_freem(m); 1442 *mp = NULL; /* avoid any further processing by caller ... */ 1443 return 1; 1444 } 1445 1446 /* Handle Non-ESP marker (32bit). If zero, then IKE. */ 1447 marker = (uint32_t *)data; 1448 if (len <= sizeof(uint32_t)) 1449 return 0; 1450 if (marker[0] == 0) 1451 return 0; 1452 1453 /* 1454 * Get the UDP ports. They are handled in network 1455 * order everywhere in IPSEC_NAT_T code. 1456 */ 1457 udphdr = (struct udphdr *)((char *)data - skip); 1458 sport = udphdr->uh_sport; 1459 dport = udphdr->uh_dport; 1460 1461 /* 1462 * Remove the UDP header (and possibly the non ESP marker) 1463 * IPv6 header length is ip6hdrlen 1464 * Before: 1465 * <---- off ---> 1466 * +-----+------+-----+ 1467 * | IP6 | UDP | ESP | 1468 * +-----+------+-----+ 1469 * <-skip-> 1470 * After: 1471 * +-----+-----+ 1472 * | IP6 | ESP | 1473 * +-----+-----+ 1474 * <-skip-> 1475 */ 1476 ip6hdrlen = off - sizeof(struct udphdr); 1477 memmove(mtod(m, char *) + skip, mtod(m, void *), ip6hdrlen); 1478 m_adj(m, skip); 1479 1480 ip6 = mtod(m, struct ip6_hdr *); 1481 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - skip); 1482 ip6->ip6_nxt = IPPROTO_ESP; 1483 1484 /* 1485 * We have modified the packet - it is now ESP, so we should not 1486 * return to UDP processing ... 1487 * 1488 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1489 * the source UDP port. This is required if we want 1490 * to select the right SPD for multiple hosts behind 1491 * same NAT 1492 */ 1493 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1494 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1495 m_freem(m); 1496 return -1; 1497 } 1498 ((u_int16_t *)(tag + 1))[0] = sport; 1499 ((u_int16_t *)(tag + 1))[1] = dport; 1500 m_tag_prepend(m, tag); 1501 1502 if (ipsec_used) 1503 ipsec6_common_input(&m, &ip6hdrlen, IPPROTO_ESP); 1504 else 1505 m_freem(m); 1506 1507 /* We handled it, it shouldn't be handled by UDP */ 1508 *mp = NULL; /* avoid free by caller ... */ 1509 return 1; 1510 } 1511 #endif /* IPSEC */ 1512 1513 PR_WRAP_USRREQS(udp6) 1514 #define udp6_attach udp6_attach_wrapper 1515 #define udp6_detach udp6_detach_wrapper 1516 #define udp6_accept udp6_accept_wrapper 1517 #define udp6_bind udp6_bind_wrapper 1518 #define udp6_listen udp6_listen_wrapper 1519 #define udp6_connect udp6_connect_wrapper 1520 #define udp6_connect2 udp6_connect2_wrapper 1521 #define udp6_disconnect udp6_disconnect_wrapper 1522 #define udp6_shutdown udp6_shutdown_wrapper 1523 #define udp6_abort udp6_abort_wrapper 1524 #define udp6_ioctl udp6_ioctl_wrapper 1525 #define udp6_stat udp6_stat_wrapper 1526 #define udp6_peeraddr udp6_peeraddr_wrapper 1527 #define udp6_sockaddr udp6_sockaddr_wrapper 1528 #define udp6_rcvd udp6_rcvd_wrapper 1529 #define udp6_recvoob udp6_recvoob_wrapper 1530 #define udp6_send udp6_send_wrapper 1531 #define udp6_sendoob udp6_sendoob_wrapper 1532 #define udp6_purgeif udp6_purgeif_wrapper 1533 1534 const struct pr_usrreqs udp6_usrreqs = { 1535 .pr_attach = udp6_attach, 1536 .pr_detach = udp6_detach, 1537 .pr_accept = udp6_accept, 1538 .pr_bind = udp6_bind, 1539 .pr_listen = udp6_listen, 1540 .pr_connect = udp6_connect, 1541 .pr_connect2 = udp6_connect2, 1542 .pr_disconnect = udp6_disconnect, 1543 .pr_shutdown = udp6_shutdown, 1544 .pr_abort = udp6_abort, 1545 .pr_ioctl = udp6_ioctl, 1546 .pr_stat = udp6_stat, 1547 .pr_peeraddr = udp6_peeraddr, 1548 .pr_sockaddr = udp6_sockaddr, 1549 .pr_rcvd = udp6_rcvd, 1550 .pr_recvoob = udp6_recvoob, 1551 .pr_send = udp6_send, 1552 .pr_sendoob = udp6_sendoob, 1553 .pr_purgeif = udp6_purgeif, 1554 };
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