1 /* $NetBSD: udp_usrreq.c,v 1.108 2003/08/22 22:00:38 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.108 2003/08/22 22:00:38 itojun Exp $"); 65 66 #include "opt_inet.h" 67 #include "opt_ipsec.h" 68 #include "opt_inet_csum.h" 69 #include "opt_ipkdb.h" 70 #include "opt_mbuftrace.h" 71 72 #include <sys/param.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/errno.h> 79 #include <sys/stat.h> 80 #include <sys/systm.h> 81 #include <sys/proc.h> 82 #include <sys/domain.h> 83 #include <sys/sysctl.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_systm.h> 90 #include <netinet/in_var.h> 91 #include <netinet/ip.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet/ip_var.h> 94 #include <netinet/ip_icmp.h> 95 #include <netinet/udp.h> 96 #include <netinet/udp_var.h> 97 98 #ifdef INET6 99 #include <netinet/ip6.h> 100 #include <netinet/icmp6.h> 101 #include <netinet6/ip6_var.h> 102 #include <netinet6/in6_pcb.h> 103 #include <netinet6/udp6_var.h> 104 #endif 105 106 #ifndef INET6 107 /* always need ip6.h for IP6_EXTHDR_GET */ 108 #include <netinet/ip6.h> 109 #endif 110 111 #include "faith.h" 112 #if defined(NFAITH) && NFAITH > 0 113 #include <net/if_faith.h> 114 #endif 115 116 #include <machine/stdarg.h> 117 118 #ifdef FAST_IPSEC 119 #include <netipsec/ipsec.h> 120 #ifdef INET6 121 #include <netipsec/ipsec6.h> 122 #endif 123 #endif /* FAST_IPSEC*/ 124 125 #ifdef IPSEC 126 #include <netinet6/ipsec.h> 127 #include <netkey/key.h> 128 #endif /*IPSEC*/ 129 130 #ifdef IPKDB 131 #include <ipkdb/ipkdb.h> 132 #endif 133 134 /* 135 * UDP protocol implementation. 136 * Per RFC 768, August, 1980. 137 */ 138 #ifndef COMPAT_42 139 int udpcksum = 1; 140 #else 141 int udpcksum = 0; /* XXX */ 142 #endif 143 144 struct inpcbtable udbtable; 145 struct udpstat udpstat; 146 147 #ifdef INET 148 static void udp4_sendup __P((struct mbuf *, int, struct sockaddr *, 149 struct socket *)); 150 static int udp4_realinput __P((struct sockaddr_in *, struct sockaddr_in *, 151 struct mbuf *, int)); 152 #endif 153 #ifdef INET6 154 static void udp6_sendup __P((struct mbuf *, int, struct sockaddr *, 155 struct socket *)); 156 static int udp6_realinput __P((int, struct sockaddr_in6 *, 157 struct sockaddr_in6 *, struct mbuf *, int)); 158 #endif 159 #ifdef INET 160 static void udp_notify __P((struct inpcb *, int)); 161 #endif 162 163 #ifndef UDBHASHSIZE 164 #define UDBHASHSIZE 128 165 #endif 166 int udbhashsize = UDBHASHSIZE; 167 168 #ifdef MBUFTRACE 169 struct mowner udp_mowner = { "udp" }; 170 struct mowner udp_rx_mowner = { "udp", "rx" }; 171 struct mowner udp_tx_mowner = { "udp", "tx" }; 172 #endif 173 174 #ifdef UDP_CSUM_COUNTERS 175 #include <sys/device.h> 176 177 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 178 NULL, "udp", "hwcsum bad"); 179 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 180 NULL, "udp", "hwcsum ok"); 181 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 182 NULL, "udp", "hwcsum data"); 183 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 184 NULL, "udp", "swcsum"); 185 186 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 187 188 #else 189 190 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 191 192 #endif /* UDP_CSUM_COUNTERS */ 193 194 void 195 udp_init() 196 { 197 198 #ifdef INET 199 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 200 #endif 201 202 #ifdef UDP_CSUM_COUNTERS 203 evcnt_attach_static(&udp_hwcsum_bad); 204 evcnt_attach_static(&udp_hwcsum_ok); 205 evcnt_attach_static(&udp_hwcsum_data); 206 evcnt_attach_static(&udp_swcsum); 207 #endif /* UDP_CSUM_COUNTERS */ 208 209 MOWNER_ATTACH(&udp_tx_mowner); 210 MOWNER_ATTACH(&udp_rx_mowner); 211 MOWNER_ATTACH(&udp_mowner); 212 } 213 214 #ifdef INET 215 void 216 #if __STDC__ 217 udp_input(struct mbuf *m, ...) 218 #else 219 udp_input(m, va_alist) 220 struct mbuf *m; 221 va_dcl 222 #endif 223 { 224 va_list ap; 225 struct sockaddr_in src, dst; 226 struct ip *ip; 227 struct udphdr *uh; 228 int iphlen; 229 int len; 230 int n; 231 u_int16_t ip_len; 232 233 va_start(ap, m); 234 iphlen = va_arg(ap, int); 235 (void)va_arg(ap, int); /* ignore value, advance ap */ 236 va_end(ap); 237 238 MCLAIM(m, &udp_rx_mowner); 239 udpstat.udps_ipackets++; 240 241 /* 242 * Get IP and UDP header together in first mbuf. 243 */ 244 ip = mtod(m, struct ip *); 245 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 246 if (uh == NULL) { 247 udpstat.udps_hdrops++; 248 return; 249 } 250 KASSERT(UDP_HDR_ALIGNED_P(uh)); 251 252 /* destination port of 0 is illegal, based on RFC768. */ 253 if (uh->uh_dport == 0) 254 goto bad; 255 256 /* 257 * Make mbuf data length reflect UDP length. 258 * If not enough data to reflect UDP length, drop. 259 */ 260 ip_len = ntohs(ip->ip_len); 261 len = ntohs((u_int16_t)uh->uh_ulen); 262 if (ip_len != iphlen + len) { 263 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 264 udpstat.udps_badlen++; 265 goto bad; 266 } 267 m_adj(m, iphlen + len - ip_len); 268 } 269 270 /* 271 * Checksum extended UDP header and data. 272 */ 273 if (uh->uh_sum) { 274 switch (m->m_pkthdr.csum_flags & 275 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 276 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 277 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 278 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 279 goto badcsum; 280 281 case M_CSUM_UDPv4|M_CSUM_DATA: { 282 u_int32_t hw_csum = m->m_pkthdr.csum_data; 283 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 284 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) 285 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, ip->ip_dst.s_addr, 286 htonl(hw_csum + ntohs(ip->ip_len) + IPPROTO_UDP)); 287 if ((hw_csum ^ 0xffff) != 0) 288 goto badcsum; 289 break; 290 } 291 292 case M_CSUM_UDPv4: 293 /* Checksum was okay. */ 294 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 295 break; 296 297 default: 298 /* Need to compute it ourselves. */ 299 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 300 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 301 goto badcsum; 302 break; 303 } 304 } 305 306 /* construct source and dst sockaddrs. */ 307 bzero(&src, sizeof(src)); 308 src.sin_family = AF_INET; 309 src.sin_len = sizeof(struct sockaddr_in); 310 bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr)); 311 src.sin_port = uh->uh_sport; 312 bzero(&dst, sizeof(dst)); 313 dst.sin_family = AF_INET; 314 dst.sin_len = sizeof(struct sockaddr_in); 315 bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr)); 316 dst.sin_port = uh->uh_dport; 317 318 n = udp4_realinput(&src, &dst, m, iphlen); 319 #ifdef INET6 320 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 321 struct sockaddr_in6 src6, dst6; 322 323 bzero(&src6, sizeof(src6)); 324 src6.sin6_family = AF_INET6; 325 src6.sin6_len = sizeof(struct sockaddr_in6); 326 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 327 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 328 sizeof(ip->ip_src)); 329 src6.sin6_port = uh->uh_sport; 330 bzero(&dst6, sizeof(dst6)); 331 dst6.sin6_family = AF_INET6; 332 dst6.sin6_len = sizeof(struct sockaddr_in6); 333 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 334 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 335 sizeof(ip->ip_dst)); 336 dst6.sin6_port = uh->uh_dport; 337 338 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 339 } 340 #endif 341 342 if (n == 0) { 343 if (m->m_flags & (M_BCAST | M_MCAST)) { 344 udpstat.udps_noportbcast++; 345 goto bad; 346 } 347 udpstat.udps_noport++; 348 #ifdef IPKDB 349 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 350 m, iphlen + sizeof(struct udphdr), 351 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 352 /* 353 * It was a debugger connect packet, 354 * just drop it now 355 */ 356 goto bad; 357 } 358 #endif 359 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 360 m = NULL; 361 } 362 363 bad: 364 if (m) 365 m_freem(m); 366 return; 367 368 badcsum: 369 m_freem(m); 370 udpstat.udps_badsum++; 371 } 372 #endif 373 374 #ifdef INET6 375 int 376 udp6_input(mp, offp, proto) 377 struct mbuf **mp; 378 int *offp, proto; 379 { 380 struct mbuf *m = *mp; 381 int off = *offp; 382 struct sockaddr_in6 src, dst; 383 struct ip6_hdr *ip6; 384 struct udphdr *uh; 385 u_int32_t plen, ulen; 386 387 ip6 = mtod(m, struct ip6_hdr *); 388 389 #if defined(NFAITH) && 0 < NFAITH 390 if (faithprefix(&ip6->ip6_dst)) { 391 /* send icmp6 host unreach? */ 392 m_freem(m); 393 return IPPROTO_DONE; 394 } 395 #endif 396 397 udp6stat.udp6s_ipackets++; 398 399 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 400 plen = m->m_pkthdr.len - off; 401 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 402 if (uh == NULL) { 403 ip6stat.ip6s_tooshort++; 404 return IPPROTO_DONE; 405 } 406 KASSERT(UDP_HDR_ALIGNED_P(uh)); 407 ulen = ntohs((u_short)uh->uh_ulen); 408 /* 409 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 410 * iff payload length > 0xffff. 411 */ 412 if (ulen == 0 && plen > 0xffff) 413 ulen = plen; 414 415 if (plen != ulen) { 416 udp6stat.udp6s_badlen++; 417 goto bad; 418 } 419 420 /* destination port of 0 is illegal, based on RFC768. */ 421 if (uh->uh_dport == 0) 422 goto bad; 423 424 /* Be proactive about malicious use of IPv4 mapped address */ 425 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 426 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 427 /* XXX stat */ 428 goto bad; 429 } 430 431 /* 432 * Checksum extended UDP header and data. 433 */ 434 if (uh->uh_sum == 0) 435 udp6stat.udp6s_nosum++; 436 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 437 udp6stat.udp6s_badsum++; 438 goto bad; 439 } 440 441 /* 442 * Construct source and dst sockaddrs. 443 * Note that ifindex (s6_addr16[1]) is already filled. 444 */ 445 bzero(&src, sizeof(src)); 446 src.sin6_family = AF_INET6; 447 src.sin6_len = sizeof(struct sockaddr_in6); 448 /* KAME hack: recover scopeid */ 449 (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif); 450 src.sin6_port = uh->uh_sport; 451 bzero(&dst, sizeof(dst)); 452 dst.sin6_family = AF_INET6; 453 dst.sin6_len = sizeof(struct sockaddr_in6); 454 /* KAME hack: recover scopeid */ 455 (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif); 456 dst.sin6_port = uh->uh_dport; 457 458 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 459 if (m->m_flags & M_MCAST) { 460 udp6stat.udp6s_noportmcast++; 461 goto bad; 462 } 463 udp6stat.udp6s_noport++; 464 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 465 m = NULL; 466 } 467 468 bad: 469 if (m) 470 m_freem(m); 471 return IPPROTO_DONE; 472 } 473 #endif 474 475 #ifdef INET 476 static void 477 udp4_sendup(m, off, src, so) 478 struct mbuf *m; 479 int off; /* offset of data portion */ 480 struct sockaddr *src; 481 struct socket *so; 482 { 483 struct mbuf *opts = NULL; 484 struct mbuf *n; 485 struct inpcb *inp = NULL; 486 487 if (!so) 488 return; 489 switch (so->so_proto->pr_domain->dom_family) { 490 case AF_INET: 491 inp = sotoinpcb(so); 492 break; 493 #ifdef INET6 494 case AF_INET6: 495 break; 496 #endif 497 default: 498 return; 499 } 500 501 #if defined(IPSEC) || defined(FAST_IPSEC) 502 /* check AH/ESP integrity. */ 503 if (so != NULL && ipsec4_in_reject_so(m, so)) { 504 ipsecstat.in_polvio++; 505 return; 506 } 507 #endif /*IPSEC*/ 508 509 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 510 if (inp && (inp->inp_flags & INP_CONTROLOPTS 511 || so->so_options & SO_TIMESTAMP)) { 512 struct ip *ip = mtod(n, struct ip *); 513 ip_savecontrol(inp, &opts, ip, n); 514 } 515 516 m_adj(n, off); 517 if (sbappendaddr(&so->so_rcv, src, n, 518 opts) == 0) { 519 m_freem(n); 520 if (opts) 521 m_freem(opts); 522 udpstat.udps_fullsock++; 523 } else 524 sorwakeup(so); 525 } 526 } 527 #endif 528 529 #ifdef INET6 530 static void 531 udp6_sendup(m, off, src, so) 532 struct mbuf *m; 533 int off; /* offset of data portion */ 534 struct sockaddr *src; 535 struct socket *so; 536 { 537 struct mbuf *opts = NULL; 538 struct mbuf *n; 539 struct in6pcb *in6p = NULL; 540 541 if (!so) 542 return; 543 if (so->so_proto->pr_domain->dom_family != AF_INET6) 544 return; 545 in6p = sotoin6pcb(so); 546 547 #if defined(IPSEC) || defined(FAST_IPSEC) 548 /* check AH/ESP integrity. */ 549 if (so != NULL && ipsec6_in_reject_so(m, so)) { 550 ipsec6stat.in_polvio++; 551 return; 552 } 553 #endif /*IPSEC*/ 554 555 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 556 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 557 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 558 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 559 ip6_savecontrol(in6p, &opts, ip6, n); 560 } 561 562 m_adj(n, off); 563 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 564 m_freem(n); 565 if (opts) 566 m_freem(opts); 567 udp6stat.udp6s_fullsock++; 568 } else 569 sorwakeup(so); 570 } 571 } 572 #endif 573 574 #ifdef INET 575 static int 576 udp4_realinput(src, dst, m, off) 577 struct sockaddr_in *src; 578 struct sockaddr_in *dst; 579 struct mbuf *m; 580 int off; /* offset of udphdr */ 581 { 582 u_int16_t *sport, *dport; 583 int rcvcnt; 584 struct in_addr *src4, *dst4; 585 struct inpcb *inp; 586 587 rcvcnt = 0; 588 off += sizeof(struct udphdr); /* now, offset of payload */ 589 590 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 591 goto bad; 592 593 src4 = &src->sin_addr; 594 sport = &src->sin_port; 595 dst4 = &dst->sin_addr; 596 dport = &dst->sin_port; 597 598 if (IN_MULTICAST(dst4->s_addr) || 599 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 600 /* 601 * Deliver a multicast or broadcast datagram to *all* sockets 602 * for which the local and remote addresses and ports match 603 * those of the incoming datagram. This allows more than 604 * one process to receive multi/broadcasts on the same port. 605 * (This really ought to be done for unicast datagrams as 606 * well, but that would cause problems with existing 607 * applications that open both address-specific sockets and 608 * a wildcard socket listening to the same port -- they would 609 * end up receiving duplicates of every unicast datagram. 610 * Those applications open the multiple sockets to overcome an 611 * inadequacy of the UDP socket interface, but for backwards 612 * compatibility we avoid the problem here rather than 613 * fixing the interface. Maybe 4.5BSD will remedy this?) 614 */ 615 616 /* 617 * KAME note: traditionally we dropped udpiphdr from mbuf here. 618 * we need udpiphdr for IPsec processing so we do that later. 619 */ 620 /* 621 * Locate pcb(s) for datagram. 622 */ 623 CIRCLEQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) { 624 if (inp->inp_lport != *dport) 625 continue; 626 if (!in_nullhost(inp->inp_laddr)) { 627 if (!in_hosteq(inp->inp_laddr, *dst4)) 628 continue; 629 } 630 if (!in_nullhost(inp->inp_faddr)) { 631 if (!in_hosteq(inp->inp_faddr, *src4) || 632 inp->inp_fport != *sport) 633 continue; 634 } 635 636 udp4_sendup(m, off, (struct sockaddr *)src, 637 inp->inp_socket); 638 rcvcnt++; 639 640 /* 641 * Don't look for additional matches if this one does 642 * not have either the SO_REUSEPORT or SO_REUSEADDR 643 * socket options set. This heuristic avoids searching 644 * through all pcbs in the common case of a non-shared 645 * port. It assumes that an application will never 646 * clear these options after setting them. 647 */ 648 if ((inp->inp_socket->so_options & 649 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 650 break; 651 } 652 } else { 653 /* 654 * Locate pcb for datagram. 655 */ 656 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 657 if (inp == 0) { 658 ++udpstat.udps_pcbhashmiss; 659 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 660 if (inp == 0) 661 return rcvcnt; 662 } 663 664 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 665 rcvcnt++; 666 } 667 668 bad: 669 return rcvcnt; 670 } 671 #endif 672 673 #ifdef INET6 674 static int 675 udp6_realinput(af, src, dst, m, off) 676 int af; /* af on packet */ 677 struct sockaddr_in6 *src; 678 struct sockaddr_in6 *dst; 679 struct mbuf *m; 680 int off; /* offset of udphdr */ 681 { 682 u_int16_t sport, dport; 683 int rcvcnt; 684 struct in6_addr src6, dst6; 685 const struct in_addr *dst4; 686 struct in6pcb *in6p; 687 688 rcvcnt = 0; 689 off += sizeof(struct udphdr); /* now, offset of payload */ 690 691 if (af != AF_INET && af != AF_INET6) 692 goto bad; 693 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 694 goto bad; 695 696 in6_embedscope(&src6, src, NULL, NULL); 697 sport = src->sin6_port; 698 in6_embedscope(&dst6, dst, NULL, NULL); 699 dport = dst->sin6_port; 700 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 701 702 if (IN6_IS_ADDR_MULTICAST(&dst6) || 703 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 704 /* 705 * Deliver a multicast or broadcast datagram to *all* sockets 706 * for which the local and remote addresses and ports match 707 * those of the incoming datagram. This allows more than 708 * one process to receive multi/broadcasts on the same port. 709 * (This really ought to be done for unicast datagrams as 710 * well, but that would cause problems with existing 711 * applications that open both address-specific sockets and 712 * a wildcard socket listening to the same port -- they would 713 * end up receiving duplicates of every unicast datagram. 714 * Those applications open the multiple sockets to overcome an 715 * inadequacy of the UDP socket interface, but for backwards 716 * compatibility we avoid the problem here rather than 717 * fixing the interface. Maybe 4.5BSD will remedy this?) 718 */ 719 720 /* 721 * KAME note: traditionally we dropped udpiphdr from mbuf here. 722 * we need udpiphdr for IPsec processing so we do that later. 723 */ 724 /* 725 * Locate pcb(s) for datagram. 726 */ 727 for (in6p = udb6.in6p_next; in6p != &udb6; 728 in6p = in6p->in6p_next) { 729 if (in6p->in6p_lport != dport) 730 continue; 731 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 732 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6)) 733 continue; 734 } else { 735 if (IN6_IS_ADDR_V4MAPPED(&dst6) && 736 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 737 continue; 738 } 739 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 740 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 741 &src6) || in6p->in6p_fport != sport) 742 continue; 743 } else { 744 if (IN6_IS_ADDR_V4MAPPED(&src6) && 745 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 746 continue; 747 } 748 749 udp6_sendup(m, off, (struct sockaddr *)src, 750 in6p->in6p_socket); 751 rcvcnt++; 752 753 /* 754 * Don't look for additional matches if this one does 755 * not have either the SO_REUSEPORT or SO_REUSEADDR 756 * socket options set. This heuristic avoids searching 757 * through all pcbs in the common case of a non-shared 758 * port. It assumes that an application will never 759 * clear these options after setting them. 760 */ 761 if ((in6p->in6p_socket->so_options & 762 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 763 break; 764 } 765 } else { 766 /* 767 * Locate pcb for datagram. 768 */ 769 in6p = in6_pcblookup_connect(&udb6, &src6, sport, 770 &dst6, dport, 0); 771 if (in6p == 0) { 772 ++udpstat.udps_pcbhashmiss; 773 in6p = in6_pcblookup_bind(&udb6, &dst6, dport, 0); 774 if (in6p == 0) 775 return rcvcnt; 776 } 777 778 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 779 rcvcnt++; 780 } 781 782 bad: 783 return rcvcnt; 784 } 785 #endif 786 787 #ifdef INET 788 /* 789 * Notify a udp user of an asynchronous error; 790 * just wake up so that he can collect error status. 791 */ 792 static void 793 udp_notify(inp, errno) 794 struct inpcb *inp; 795 int errno; 796 { 797 798 inp->inp_socket->so_error = errno; 799 sorwakeup(inp->inp_socket); 800 sowwakeup(inp->inp_socket); 801 } 802 803 void * 804 udp_ctlinput(cmd, sa, v) 805 int cmd; 806 struct sockaddr *sa; 807 void *v; 808 { 809 struct ip *ip = v; 810 struct udphdr *uh; 811 void (*notify) __P((struct inpcb *, int)) = udp_notify; 812 int errno; 813 814 if (sa->sa_family != AF_INET 815 || sa->sa_len != sizeof(struct sockaddr_in)) 816 return NULL; 817 if ((unsigned)cmd >= PRC_NCMDS) 818 return NULL; 819 errno = inetctlerrmap[cmd]; 820 if (PRC_IS_REDIRECT(cmd)) 821 notify = in_rtchange, ip = 0; 822 else if (cmd == PRC_HOSTDEAD) 823 ip = 0; 824 else if (errno == 0) 825 return NULL; 826 if (ip) { 827 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 828 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 829 ip->ip_src, uh->uh_sport, errno, notify); 830 831 /* XXX mapped address case */ 832 } else 833 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 834 notify); 835 return NULL; 836 } 837 838 int 839 #if __STDC__ 840 udp_output(struct mbuf *m, ...) 841 #else 842 udp_output(m, va_alist) 843 struct mbuf *m; 844 va_dcl 845 #endif 846 { 847 struct inpcb *inp; 848 struct udpiphdr *ui; 849 int len = m->m_pkthdr.len; 850 int error = 0; 851 va_list ap; 852 853 MCLAIM(m, &udp_tx_mowner); 854 va_start(ap, m); 855 inp = va_arg(ap, struct inpcb *); 856 va_end(ap); 857 858 /* 859 * Calculate data length and get a mbuf 860 * for UDP and IP headers. 861 */ 862 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 863 if (m == 0) { 864 error = ENOBUFS; 865 goto release; 866 } 867 868 /* 869 * Compute the packet length of the IP header, and 870 * punt if the length looks bogus. 871 */ 872 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 873 error = EMSGSIZE; 874 goto release; 875 } 876 877 /* 878 * Fill in mbuf with extended UDP header 879 * and addresses and length put into network format. 880 */ 881 ui = mtod(m, struct udpiphdr *); 882 ui->ui_pr = IPPROTO_UDP; 883 ui->ui_src = inp->inp_laddr; 884 ui->ui_dst = inp->inp_faddr; 885 ui->ui_sport = inp->inp_lport; 886 ui->ui_dport = inp->inp_fport; 887 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 888 889 /* 890 * Set up checksum and output datagram. 891 */ 892 if (udpcksum) { 893 /* 894 * XXX Cache pseudo-header checksum part for 895 * XXX "connected" UDP sockets. 896 */ 897 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 898 ui->ui_dst.s_addr, htons((u_int16_t)len + 899 sizeof(struct udphdr) + IPPROTO_UDP)); 900 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 901 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 902 } else 903 ui->ui_sum = 0; 904 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 905 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 906 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 907 udpstat.udps_opackets++; 908 909 return (ip_output(m, inp->inp_options, &inp->inp_route, 910 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 911 inp->inp_moptions, inp->inp_socket)); 912 913 release: 914 m_freem(m); 915 return (error); 916 } 917 918 int udp_sendspace = 9216; /* really max datagram size */ 919 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 920 /* 40 1K datagrams */ 921 922 /*ARGSUSED*/ 923 int 924 udp_usrreq(so, req, m, nam, control, p) 925 struct socket *so; 926 int req; 927 struct mbuf *m, *nam, *control; 928 struct proc *p; 929 { 930 struct inpcb *inp; 931 int s; 932 int error = 0; 933 934 if (req == PRU_CONTROL) 935 return (in_control(so, (long)m, (caddr_t)nam, 936 (struct ifnet *)control, p)); 937 938 if (req == PRU_PURGEIF) { 939 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 940 in_purgeif((struct ifnet *)control); 941 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 942 return (0); 943 } 944 945 s = splsoftnet(); 946 inp = sotoinpcb(so); 947 #ifdef DIAGNOSTIC 948 if (req != PRU_SEND && req != PRU_SENDOOB && control) 949 panic("udp_usrreq: unexpected control mbuf"); 950 #endif 951 if (inp == 0 && req != PRU_ATTACH) { 952 error = EINVAL; 953 goto release; 954 } 955 956 /* 957 * Note: need to block udp_input while changing 958 * the udp pcb queue and/or pcb addresses. 959 */ 960 switch (req) { 961 962 case PRU_ATTACH: 963 if (inp != 0) { 964 error = EISCONN; 965 break; 966 } 967 #ifdef MBUFTRACE 968 so->so_mowner = &udp_mowner; 969 so->so_rcv.sb_mowner = &udp_rx_mowner; 970 so->so_snd.sb_mowner = &udp_tx_mowner; 971 #endif 972 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 973 error = soreserve(so, udp_sendspace, udp_recvspace); 974 if (error) 975 break; 976 } 977 error = in_pcballoc(so, &udbtable); 978 if (error) 979 break; 980 inp = sotoinpcb(so); 981 inp->inp_ip.ip_ttl = ip_defttl; 982 break; 983 984 case PRU_DETACH: 985 in_pcbdetach(inp); 986 break; 987 988 case PRU_BIND: 989 error = in_pcbbind(inp, nam, p); 990 break; 991 992 case PRU_LISTEN: 993 error = EOPNOTSUPP; 994 break; 995 996 case PRU_CONNECT: 997 error = in_pcbconnect(inp, nam); 998 if (error) 999 break; 1000 soisconnected(so); 1001 break; 1002 1003 case PRU_CONNECT2: 1004 error = EOPNOTSUPP; 1005 break; 1006 1007 case PRU_DISCONNECT: 1008 /*soisdisconnected(so);*/ 1009 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1010 in_pcbdisconnect(inp); 1011 inp->inp_laddr = zeroin_addr; /* XXX */ 1012 if (inp->inp_ia != NULL) { 1013 LIST_REMOVE(inp, inp_ialink); 1014 IFAFREE(&inp->inp_ia->ia_ifa); 1015 inp->inp_ia = NULL; 1016 } 1017 in_pcbstate(inp, INP_BOUND); /* XXX */ 1018 break; 1019 1020 case PRU_SHUTDOWN: 1021 socantsendmore(so); 1022 break; 1023 1024 case PRU_RCVD: 1025 error = EOPNOTSUPP; 1026 break; 1027 1028 case PRU_SEND: 1029 if (control && control->m_len) { 1030 m_freem(control); 1031 m_freem(m); 1032 error = EINVAL; 1033 break; 1034 } 1035 { 1036 struct in_addr laddr; /* XXX */ 1037 1038 if (nam) { 1039 laddr = inp->inp_laddr; /* XXX */ 1040 if ((so->so_state & SS_ISCONNECTED) != 0) { 1041 error = EISCONN; 1042 goto die; 1043 } 1044 error = in_pcbconnect(inp, nam); 1045 if (error) 1046 goto die; 1047 } else { 1048 if ((so->so_state & SS_ISCONNECTED) == 0) { 1049 error = ENOTCONN; 1050 goto die; 1051 } 1052 } 1053 error = udp_output(m, inp); 1054 m = NULL; 1055 if (nam) { 1056 in_pcbdisconnect(inp); 1057 inp->inp_laddr = laddr; /* XXX */ 1058 in_pcbstate(inp, INP_BOUND); /* XXX */ 1059 } 1060 die: 1061 if (inp->inp_ia != NULL && in_nullhost(inp->inp_laddr)) { 1062 LIST_REMOVE(inp, inp_ialink); 1063 IFAFREE(&inp->inp_ia->ia_ifa); 1064 inp->inp_ia = NULL; 1065 } 1066 if (m) 1067 m_freem(m); 1068 } 1069 break; 1070 1071 case PRU_SENSE: 1072 /* 1073 * stat: don't bother with a blocksize. 1074 */ 1075 splx(s); 1076 return (0); 1077 1078 case PRU_RCVOOB: 1079 error = EOPNOTSUPP; 1080 break; 1081 1082 case PRU_SENDOOB: 1083 m_freem(control); 1084 m_freem(m); 1085 error = EOPNOTSUPP; 1086 break; 1087 1088 case PRU_SOCKADDR: 1089 in_setsockaddr(inp, nam); 1090 break; 1091 1092 case PRU_PEERADDR: 1093 in_setpeeraddr(inp, nam); 1094 break; 1095 1096 default: 1097 panic("udp_usrreq"); 1098 } 1099 1100 release: 1101 splx(s); 1102 return (error); 1103 } 1104 1105 /* 1106 * Sysctl for udp variables. 1107 */ 1108 int 1109 udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 1110 int *name; 1111 u_int namelen; 1112 void *oldp; 1113 size_t *oldlenp; 1114 void *newp; 1115 size_t newlen; 1116 { 1117 /* All sysctl names at this level are terminal. */ 1118 if (namelen != 1) 1119 return (ENOTDIR); 1120 1121 switch (name[0]) { 1122 case UDPCTL_CHECKSUM: 1123 return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum)); 1124 case UDPCTL_SENDSPACE: 1125 return (sysctl_int(oldp, oldlenp, newp, newlen, 1126 &udp_sendspace)); 1127 case UDPCTL_RECVSPACE: 1128 return (sysctl_int(oldp, oldlenp, newp, newlen, 1129 &udp_recvspace)); 1130 default: 1131 return (ENOPROTOOPT); 1132 } 1133 /* NOTREACHED */ 1134 } 1135 #endif 1136