1 /* $NetBSD: udp_usrreq.c,v 1.125 2004/12/15 04:25:20 thorpej 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 1.125 2004/12/15 04:25:20 thorpej 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 #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */ 121 #ifdef INET6 122 #include <netipsec/ipsec6.h> 123 #endif 124 #endif /* FAST_IPSEC*/ 125 126 #ifdef IPSEC 127 #include <netinet6/ipsec.h> 128 #include <netkey/key.h> 129 #endif /*IPSEC*/ 130 131 #ifdef IPKDB 132 #include <ipkdb/ipkdb.h> 133 #endif 134 135 /* 136 * UDP protocol implementation. 137 * Per RFC 768, August, 1980. 138 */ 139 #ifndef COMPAT_42 140 int udpcksum = 1; 141 #else 142 int udpcksum = 0; /* XXX */ 143 #endif 144 int udp_do_loopback_cksum = 0; 145 146 struct inpcbtable udbtable; 147 struct udpstat udpstat; 148 149 #ifdef INET 150 static void udp4_sendup (struct mbuf *, int, struct sockaddr *, 151 struct socket *); 152 static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, 153 struct mbuf *, int); 154 #endif 155 #ifdef INET6 156 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 157 struct socket *); 158 static int udp6_realinput (int, struct sockaddr_in6 *, 159 struct sockaddr_in6 *, struct mbuf *, int); 160 #endif 161 #ifdef INET 162 static void udp_notify (struct inpcb *, int); 163 #endif 164 165 #ifndef UDBHASHSIZE 166 #define UDBHASHSIZE 128 167 #endif 168 int udbhashsize = UDBHASHSIZE; 169 170 #ifdef MBUFTRACE 171 struct mowner udp_mowner = { "udp" }; 172 struct mowner udp_rx_mowner = { "udp", "rx" }; 173 struct mowner udp_tx_mowner = { "udp", "tx" }; 174 #endif 175 176 #ifdef UDP_CSUM_COUNTERS 177 #include <sys/device.h> 178 179 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 180 NULL, "udp", "hwcsum bad"); 181 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 182 NULL, "udp", "hwcsum ok"); 183 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 184 NULL, "udp", "hwcsum data"); 185 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 186 NULL, "udp", "swcsum"); 187 188 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 189 190 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 191 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 192 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 193 EVCNT_ATTACH_STATIC(udp_swcsum); 194 195 #else 196 197 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 198 199 #endif /* UDP_CSUM_COUNTERS */ 200 201 void 202 udp_init(void) 203 { 204 205 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 206 207 MOWNER_ATTACH(&udp_tx_mowner); 208 MOWNER_ATTACH(&udp_rx_mowner); 209 MOWNER_ATTACH(&udp_mowner); 210 } 211 212 #ifdef INET 213 void 214 udp_input(struct mbuf *m, ...) 215 { 216 va_list ap; 217 struct sockaddr_in src, dst; 218 struct ip *ip; 219 struct udphdr *uh; 220 int iphlen; 221 int len; 222 int n; 223 u_int16_t ip_len; 224 225 va_start(ap, m); 226 iphlen = va_arg(ap, int); 227 (void)va_arg(ap, int); /* ignore value, advance ap */ 228 va_end(ap); 229 230 MCLAIM(m, &udp_rx_mowner); 231 udpstat.udps_ipackets++; 232 233 /* 234 * Get IP and UDP header together in first mbuf. 235 */ 236 ip = mtod(m, struct ip *); 237 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 238 if (uh == NULL) { 239 udpstat.udps_hdrops++; 240 return; 241 } 242 KASSERT(UDP_HDR_ALIGNED_P(uh)); 243 244 /* destination port of 0 is illegal, based on RFC768. */ 245 if (uh->uh_dport == 0) 246 goto bad; 247 248 /* 249 * Make mbuf data length reflect UDP length. 250 * If not enough data to reflect UDP length, drop. 251 */ 252 ip_len = ntohs(ip->ip_len); 253 len = ntohs((u_int16_t)uh->uh_ulen); 254 if (ip_len != iphlen + len) { 255 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 256 udpstat.udps_badlen++; 257 goto bad; 258 } 259 m_adj(m, iphlen + len - ip_len); 260 } 261 262 /* 263 * Checksum extended UDP header and data. 264 */ 265 if (uh->uh_sum) { 266 switch (m->m_pkthdr.csum_flags & 267 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 268 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 269 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 270 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 271 goto badcsum; 272 273 case M_CSUM_UDPv4|M_CSUM_DATA: { 274 u_int32_t hw_csum = m->m_pkthdr.csum_data; 275 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 276 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) 277 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 278 ip->ip_dst.s_addr, 279 htons(hw_csum + len + IPPROTO_UDP)); 280 if ((hw_csum ^ 0xffff) != 0) 281 goto badcsum; 282 break; 283 } 284 285 case M_CSUM_UDPv4: 286 /* Checksum was okay. */ 287 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 288 break; 289 290 default: 291 /* 292 * Need to compute it ourselves. Maybe skip checksum 293 * on loopback interfaces. 294 */ 295 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 296 IFF_LOOPBACK) || 297 udp_do_loopback_cksum)) { 298 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 299 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 300 goto badcsum; 301 } 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(struct mbuf **mp, int *offp, int proto) 377 { 378 struct mbuf *m = *mp; 379 int off = *offp; 380 struct sockaddr_in6 src, dst; 381 struct ip6_hdr *ip6; 382 struct udphdr *uh; 383 u_int32_t plen, ulen; 384 385 ip6 = mtod(m, struct ip6_hdr *); 386 387 #if defined(NFAITH) && 0 < NFAITH 388 if (faithprefix(&ip6->ip6_dst)) { 389 /* send icmp6 host unreach? */ 390 m_freem(m); 391 return IPPROTO_DONE; 392 } 393 #endif 394 395 udp6stat.udp6s_ipackets++; 396 397 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 398 plen = m->m_pkthdr.len - off; 399 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 400 if (uh == NULL) { 401 ip6stat.ip6s_tooshort++; 402 return IPPROTO_DONE; 403 } 404 KASSERT(UDP_HDR_ALIGNED_P(uh)); 405 ulen = ntohs((u_short)uh->uh_ulen); 406 /* 407 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 408 * iff payload length > 0xffff. 409 */ 410 if (ulen == 0 && plen > 0xffff) 411 ulen = plen; 412 413 if (plen != ulen) { 414 udp6stat.udp6s_badlen++; 415 goto bad; 416 } 417 418 /* destination port of 0 is illegal, based on RFC768. */ 419 if (uh->uh_dport == 0) 420 goto bad; 421 422 /* Be proactive about malicious use of IPv4 mapped address */ 423 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 424 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 425 /* XXX stat */ 426 goto bad; 427 } 428 429 /* 430 * Checksum extended UDP header and data. Maybe skip checksum 431 * on loopback interfaces. 432 */ 433 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 434 IFF_LOOPBACK) || 435 udp_do_loopback_cksum)) { 436 if (uh->uh_sum == 0) { 437 udp6stat.udp6s_nosum++; 438 goto bad; 439 } 440 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 441 udp6stat.udp6s_badsum++; 442 goto bad; 443 } 444 } 445 446 /* 447 * Construct source and dst sockaddrs. 448 * Note that ifindex (s6_addr16[1]) is already filled. 449 */ 450 bzero(&src, sizeof(src)); 451 src.sin6_family = AF_INET6; 452 src.sin6_len = sizeof(struct sockaddr_in6); 453 /* KAME hack: recover scopeid */ 454 (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif); 455 src.sin6_port = uh->uh_sport; 456 bzero(&dst, sizeof(dst)); 457 dst.sin6_family = AF_INET6; 458 dst.sin6_len = sizeof(struct sockaddr_in6); 459 /* KAME hack: recover scopeid */ 460 (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif); 461 dst.sin6_port = uh->uh_dport; 462 463 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 464 if (m->m_flags & M_MCAST) { 465 udp6stat.udp6s_noportmcast++; 466 goto bad; 467 } 468 udp6stat.udp6s_noport++; 469 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 470 m = NULL; 471 } 472 473 bad: 474 if (m) 475 m_freem(m); 476 return IPPROTO_DONE; 477 } 478 #endif 479 480 #ifdef INET 481 static void 482 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 483 struct sockaddr *src, struct socket *so) 484 { 485 struct mbuf *opts = NULL; 486 struct mbuf *n; 487 struct inpcb *inp = NULL; 488 489 if (!so) 490 return; 491 switch (so->so_proto->pr_domain->dom_family) { 492 case AF_INET: 493 inp = sotoinpcb(so); 494 break; 495 #ifdef INET6 496 case AF_INET6: 497 break; 498 #endif 499 default: 500 return; 501 } 502 503 #if defined(IPSEC) || defined(FAST_IPSEC) 504 /* check AH/ESP integrity. */ 505 if (so != NULL && ipsec4_in_reject_so(m, so)) { 506 ipsecstat.in_polvio++; 507 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 508 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 509 0, 0); 510 return; 511 } 512 #endif /*IPSEC*/ 513 514 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 515 if (inp && (inp->inp_flags & INP_CONTROLOPTS 516 || so->so_options & SO_TIMESTAMP)) { 517 struct ip *ip = mtod(n, struct ip *); 518 ip_savecontrol(inp, &opts, ip, n); 519 } 520 521 m_adj(n, off); 522 if (sbappendaddr(&so->so_rcv, src, n, 523 opts) == 0) { 524 m_freem(n); 525 if (opts) 526 m_freem(opts); 527 so->so_rcv.sb_overflowed++; 528 udpstat.udps_fullsock++; 529 } else 530 sorwakeup(so); 531 } 532 } 533 #endif 534 535 #ifdef INET6 536 static void 537 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 538 struct sockaddr *src, struct socket *so) 539 { 540 struct mbuf *opts = NULL; 541 struct mbuf *n; 542 struct in6pcb *in6p = NULL; 543 544 if (!so) 545 return; 546 if (so->so_proto->pr_domain->dom_family != AF_INET6) 547 return; 548 in6p = sotoin6pcb(so); 549 550 #if defined(IPSEC) || defined(FAST_IPSEC) 551 /* check AH/ESP integrity. */ 552 if (so != NULL && ipsec6_in_reject_so(m, so)) { 553 ipsec6stat.in_polvio++; 554 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 555 icmp6_error(n, ICMP6_DST_UNREACH, 556 ICMP6_DST_UNREACH_ADMIN, 0); 557 return; 558 } 559 #endif /*IPSEC*/ 560 561 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 562 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 563 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 564 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 565 ip6_savecontrol(in6p, &opts, ip6, n); 566 } 567 568 m_adj(n, off); 569 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 570 m_freem(n); 571 if (opts) 572 m_freem(opts); 573 so->so_rcv.sb_overflowed++; 574 udp6stat.udp6s_fullsock++; 575 } else 576 sorwakeup(so); 577 } 578 } 579 #endif 580 581 #ifdef INET 582 static int 583 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 584 struct mbuf *m, int off /* offset of udphdr */) 585 { 586 u_int16_t *sport, *dport; 587 int rcvcnt; 588 struct in_addr *src4, *dst4; 589 struct inpcb_hdr *inph; 590 struct inpcb *inp; 591 592 rcvcnt = 0; 593 off += sizeof(struct udphdr); /* now, offset of payload */ 594 595 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 596 goto bad; 597 598 src4 = &src->sin_addr; 599 sport = &src->sin_port; 600 dst4 = &dst->sin_addr; 601 dport = &dst->sin_port; 602 603 if (IN_MULTICAST(dst4->s_addr) || 604 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 605 /* 606 * Deliver a multicast or broadcast datagram to *all* sockets 607 * for which the local and remote addresses and ports match 608 * those of the incoming datagram. This allows more than 609 * one process to receive multi/broadcasts on the same port. 610 * (This really ought to be done for unicast datagrams as 611 * well, but that would cause problems with existing 612 * applications that open both address-specific sockets and 613 * a wildcard socket listening to the same port -- they would 614 * end up receiving duplicates of every unicast datagram. 615 * Those applications open the multiple sockets to overcome an 616 * inadequacy of the UDP socket interface, but for backwards 617 * compatibility we avoid the problem here rather than 618 * fixing the interface. Maybe 4.5BSD will remedy this?) 619 */ 620 621 /* 622 * KAME note: traditionally we dropped udpiphdr from mbuf here. 623 * we need udpiphdr for IPsec processing so we do that later. 624 */ 625 /* 626 * Locate pcb(s) for datagram. 627 */ 628 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 629 inp = (struct inpcb *)inph; 630 if (inp->inp_af != AF_INET) 631 continue; 632 633 if (inp->inp_lport != *dport) 634 continue; 635 if (!in_nullhost(inp->inp_laddr)) { 636 if (!in_hosteq(inp->inp_laddr, *dst4)) 637 continue; 638 } 639 if (!in_nullhost(inp->inp_faddr)) { 640 if (!in_hosteq(inp->inp_faddr, *src4) || 641 inp->inp_fport != *sport) 642 continue; 643 } 644 645 udp4_sendup(m, off, (struct sockaddr *)src, 646 inp->inp_socket); 647 rcvcnt++; 648 649 /* 650 * Don't look for additional matches if this one does 651 * not have either the SO_REUSEPORT or SO_REUSEADDR 652 * socket options set. This heuristic avoids searching 653 * through all pcbs in the common case of a non-shared 654 * port. It assumes that an application will never 655 * clear these options after setting them. 656 */ 657 if ((inp->inp_socket->so_options & 658 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 659 break; 660 } 661 } else { 662 /* 663 * Locate pcb for datagram. 664 */ 665 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 666 if (inp == 0) { 667 ++udpstat.udps_pcbhashmiss; 668 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 669 if (inp == 0) 670 return rcvcnt; 671 } 672 673 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 674 rcvcnt++; 675 } 676 677 bad: 678 return rcvcnt; 679 } 680 #endif 681 682 #ifdef INET6 683 static int 684 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 685 struct mbuf *m, int off) 686 { 687 u_int16_t sport, dport; 688 int rcvcnt; 689 struct in6_addr src6, dst6; 690 const struct in_addr *dst4; 691 struct inpcb_hdr *inph; 692 struct in6pcb *in6p; 693 694 rcvcnt = 0; 695 off += sizeof(struct udphdr); /* now, offset of payload */ 696 697 if (af != AF_INET && af != AF_INET6) 698 goto bad; 699 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 700 goto bad; 701 702 in6_embedscope(&src6, src, NULL, NULL); 703 sport = src->sin6_port; 704 in6_embedscope(&dst6, dst, NULL, NULL); 705 dport = dst->sin6_port; 706 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 707 708 if (IN6_IS_ADDR_MULTICAST(&dst6) || 709 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 710 /* 711 * Deliver a multicast or broadcast datagram to *all* sockets 712 * for which the local and remote addresses and ports match 713 * those of the incoming datagram. This allows more than 714 * one process to receive multi/broadcasts on the same port. 715 * (This really ought to be done for unicast datagrams as 716 * well, but that would cause problems with existing 717 * applications that open both address-specific sockets and 718 * a wildcard socket listening to the same port -- they would 719 * end up receiving duplicates of every unicast datagram. 720 * Those applications open the multiple sockets to overcome an 721 * inadequacy of the UDP socket interface, but for backwards 722 * compatibility we avoid the problem here rather than 723 * fixing the interface. Maybe 4.5BSD will remedy this?) 724 */ 725 726 /* 727 * KAME note: traditionally we dropped udpiphdr from mbuf here. 728 * we need udpiphdr for IPsec processing so we do that later. 729 */ 730 /* 731 * Locate pcb(s) for datagram. 732 */ 733 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 734 in6p = (struct in6pcb *)inph; 735 if (in6p->in6p_af != AF_INET6) 736 continue; 737 738 if (in6p->in6p_lport != dport) 739 continue; 740 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 741 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6)) 742 continue; 743 } else { 744 if (IN6_IS_ADDR_V4MAPPED(&dst6) && 745 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 746 continue; 747 } 748 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 749 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 750 &src6) || in6p->in6p_fport != sport) 751 continue; 752 } else { 753 if (IN6_IS_ADDR_V4MAPPED(&src6) && 754 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 755 continue; 756 } 757 758 udp6_sendup(m, off, (struct sockaddr *)src, 759 in6p->in6p_socket); 760 rcvcnt++; 761 762 /* 763 * Don't look for additional matches if this one does 764 * not have either the SO_REUSEPORT or SO_REUSEADDR 765 * socket options set. This heuristic avoids searching 766 * through all pcbs in the common case of a non-shared 767 * port. It assumes that an application will never 768 * clear these options after setting them. 769 */ 770 if ((in6p->in6p_socket->so_options & 771 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 772 break; 773 } 774 } else { 775 /* 776 * Locate pcb for datagram. 777 */ 778 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, 779 &dst6, dport, 0); 780 if (in6p == 0) { 781 ++udpstat.udps_pcbhashmiss; 782 in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0); 783 if (in6p == 0) 784 return rcvcnt; 785 } 786 787 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 788 rcvcnt++; 789 } 790 791 bad: 792 return rcvcnt; 793 } 794 #endif 795 796 #ifdef INET 797 /* 798 * Notify a udp user of an asynchronous error; 799 * just wake up so that he can collect error status. 800 */ 801 static void 802 udp_notify(struct inpcb *inp, int errno) 803 { 804 inp->inp_socket->so_error = errno; 805 sorwakeup(inp->inp_socket); 806 sowwakeup(inp->inp_socket); 807 } 808 809 void * 810 udp_ctlinput(int cmd, struct sockaddr *sa, void *v) 811 { 812 struct ip *ip = v; 813 struct udphdr *uh; 814 void (*notify)(struct inpcb *, int) = udp_notify; 815 int errno; 816 817 if (sa->sa_family != AF_INET 818 || sa->sa_len != sizeof(struct sockaddr_in)) 819 return NULL; 820 if ((unsigned)cmd >= PRC_NCMDS) 821 return NULL; 822 errno = inetctlerrmap[cmd]; 823 if (PRC_IS_REDIRECT(cmd)) 824 notify = in_rtchange, ip = 0; 825 else if (cmd == PRC_HOSTDEAD) 826 ip = 0; 827 else if (errno == 0) 828 return NULL; 829 if (ip) { 830 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 831 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 832 ip->ip_src, uh->uh_sport, errno, notify); 833 834 /* XXX mapped address case */ 835 } else 836 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 837 notify); 838 return NULL; 839 } 840 841 int 842 udp_output(struct mbuf *m, ...) 843 { 844 struct inpcb *inp; 845 struct udpiphdr *ui; 846 struct route *ro; 847 int len = m->m_pkthdr.len; 848 int error = 0; 849 va_list ap; 850 851 MCLAIM(m, &udp_tx_mowner); 852 va_start(ap, m); 853 inp = va_arg(ap, struct inpcb *); 854 va_end(ap); 855 856 /* 857 * Calculate data length and get a mbuf 858 * for UDP and IP headers. 859 */ 860 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 861 if (m == 0) { 862 error = ENOBUFS; 863 goto release; 864 } 865 866 /* 867 * Compute the packet length of the IP header, and 868 * punt if the length looks bogus. 869 */ 870 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 871 error = EMSGSIZE; 872 goto release; 873 } 874 875 /* 876 * Fill in mbuf with extended UDP header 877 * and addresses and length put into network format. 878 */ 879 ui = mtod(m, struct udpiphdr *); 880 ui->ui_pr = IPPROTO_UDP; 881 ui->ui_src = inp->inp_laddr; 882 ui->ui_dst = inp->inp_faddr; 883 ui->ui_sport = inp->inp_lport; 884 ui->ui_dport = inp->inp_fport; 885 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 886 887 ro = &inp->inp_route; 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 * Maybe skip checksums on loopback interfaces. 897 */ 898 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 899 ui->ui_dst.s_addr, htons((u_int16_t)len + 900 sizeof(struct udphdr) + IPPROTO_UDP)); 901 if (__predict_true(ro->ro_rt == NULL || 902 !(ro->ro_rt->rt_ifp->if_flags & 903 IFF_LOOPBACK) || 904 udp_do_loopback_cksum)) 905 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 906 else 907 m->m_pkthdr.csum_flags = 0; 908 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 909 } else 910 ui->ui_sum = 0; 911 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 912 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 913 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 914 udpstat.udps_opackets++; 915 916 return (ip_output(m, inp->inp_options, ro, 917 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 918 inp->inp_moptions, inp->inp_socket)); 919 920 release: 921 m_freem(m); 922 return (error); 923 } 924 925 int udp_sendspace = 9216; /* really max datagram size */ 926 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 927 /* 40 1K datagrams */ 928 929 /*ARGSUSED*/ 930 int 931 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 932 struct mbuf *control, struct proc *p) 933 { 934 struct inpcb *inp; 935 int s; 936 int error = 0; 937 938 if (req == PRU_CONTROL) 939 return (in_control(so, (long)m, (caddr_t)nam, 940 (struct ifnet *)control, p)); 941 942 if (req == PRU_PURGEIF) { 943 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 944 in_purgeif((struct ifnet *)control); 945 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 946 return (0); 947 } 948 949 s = splsoftnet(); 950 inp = sotoinpcb(so); 951 #ifdef DIAGNOSTIC 952 if (req != PRU_SEND && req != PRU_SENDOOB && control) 953 panic("udp_usrreq: unexpected control mbuf"); 954 #endif 955 if (inp == 0 && req != PRU_ATTACH) { 956 error = EINVAL; 957 goto release; 958 } 959 960 /* 961 * Note: need to block udp_input while changing 962 * the udp pcb queue and/or pcb addresses. 963 */ 964 switch (req) { 965 966 case PRU_ATTACH: 967 if (inp != 0) { 968 error = EISCONN; 969 break; 970 } 971 #ifdef MBUFTRACE 972 so->so_mowner = &udp_mowner; 973 so->so_rcv.sb_mowner = &udp_rx_mowner; 974 so->so_snd.sb_mowner = &udp_tx_mowner; 975 #endif 976 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 977 error = soreserve(so, udp_sendspace, udp_recvspace); 978 if (error) 979 break; 980 } 981 error = in_pcballoc(so, &udbtable); 982 if (error) 983 break; 984 inp = sotoinpcb(so); 985 inp->inp_ip.ip_ttl = ip_defttl; 986 break; 987 988 case PRU_DETACH: 989 in_pcbdetach(inp); 990 break; 991 992 case PRU_BIND: 993 error = in_pcbbind(inp, nam, p); 994 break; 995 996 case PRU_LISTEN: 997 error = EOPNOTSUPP; 998 break; 999 1000 case PRU_CONNECT: 1001 error = in_pcbconnect(inp, nam); 1002 if (error) 1003 break; 1004 soisconnected(so); 1005 break; 1006 1007 case PRU_CONNECT2: 1008 error = EOPNOTSUPP; 1009 break; 1010 1011 case PRU_DISCONNECT: 1012 /*soisdisconnected(so);*/ 1013 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1014 in_pcbdisconnect(inp); 1015 inp->inp_laddr = zeroin_addr; /* XXX */ 1016 in_pcbstate(inp, INP_BOUND); /* XXX */ 1017 break; 1018 1019 case PRU_SHUTDOWN: 1020 socantsendmore(so); 1021 break; 1022 1023 case PRU_RCVD: 1024 error = EOPNOTSUPP; 1025 break; 1026 1027 case PRU_SEND: 1028 if (control && control->m_len) { 1029 m_freem(control); 1030 m_freem(m); 1031 error = EINVAL; 1032 break; 1033 } 1034 { 1035 struct in_addr laddr; /* XXX */ 1036 1037 if (nam) { 1038 laddr = inp->inp_laddr; /* XXX */ 1039 if ((so->so_state & SS_ISCONNECTED) != 0) { 1040 error = EISCONN; 1041 goto die; 1042 } 1043 error = in_pcbconnect(inp, nam); 1044 if (error) 1045 goto die; 1046 } else { 1047 if ((so->so_state & SS_ISCONNECTED) == 0) { 1048 error = ENOTCONN; 1049 goto die; 1050 } 1051 } 1052 error = udp_output(m, inp); 1053 m = NULL; 1054 if (nam) { 1055 in_pcbdisconnect(inp); 1056 inp->inp_laddr = laddr; /* XXX */ 1057 in_pcbstate(inp, INP_BOUND); /* XXX */ 1058 } 1059 die: 1060 if (m) 1061 m_freem(m); 1062 } 1063 break; 1064 1065 case PRU_SENSE: 1066 /* 1067 * stat: don't bother with a blocksize. 1068 */ 1069 splx(s); 1070 return (0); 1071 1072 case PRU_RCVOOB: 1073 error = EOPNOTSUPP; 1074 break; 1075 1076 case PRU_SENDOOB: 1077 m_freem(control); 1078 m_freem(m); 1079 error = EOPNOTSUPP; 1080 break; 1081 1082 case PRU_SOCKADDR: 1083 in_setsockaddr(inp, nam); 1084 break; 1085 1086 case PRU_PEERADDR: 1087 in_setpeeraddr(inp, nam); 1088 break; 1089 1090 default: 1091 panic("udp_usrreq"); 1092 } 1093 1094 release: 1095 splx(s); 1096 return (error); 1097 } 1098 1099 /* 1100 * Sysctl for udp variables. 1101 */ 1102 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1103 { 1104 1105 sysctl_createv(clog, 0, NULL, NULL, 1106 CTLFLAG_PERMANENT, 1107 CTLTYPE_NODE, "net", NULL, 1108 NULL, 0, NULL, 0, 1109 CTL_NET, CTL_EOL); 1110 sysctl_createv(clog, 0, NULL, NULL, 1111 CTLFLAG_PERMANENT, 1112 CTLTYPE_NODE, "inet", NULL, 1113 NULL, 0, NULL, 0, 1114 CTL_NET, PF_INET, CTL_EOL); 1115 sysctl_createv(clog, 0, NULL, NULL, 1116 CTLFLAG_PERMANENT, 1117 CTLTYPE_NODE, "udp", 1118 SYSCTL_DESCR("UDPv4 related settings"), 1119 NULL, 0, NULL, 0, 1120 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1121 1122 sysctl_createv(clog, 0, NULL, NULL, 1123 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1124 CTLTYPE_INT, "checksum", 1125 SYSCTL_DESCR("Compute UDP checksums"), 1126 NULL, 0, &udpcksum, 0, 1127 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1128 CTL_EOL); 1129 sysctl_createv(clog, 0, NULL, NULL, 1130 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1131 CTLTYPE_INT, "sendspace", 1132 SYSCTL_DESCR("Default UDP send buffer size"), 1133 NULL, 0, &udp_sendspace, 0, 1134 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1135 CTL_EOL); 1136 sysctl_createv(clog, 0, NULL, NULL, 1137 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1138 CTLTYPE_INT, "recvspace", 1139 SYSCTL_DESCR("Default UDP receive buffer size"), 1140 NULL, 0, &udp_recvspace, 0, 1141 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1142 CTL_EOL); 1143 sysctl_createv(clog, 0, NULL, NULL, 1144 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1145 CTLTYPE_INT, "do_loopback_cksum", 1146 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1147 NULL, 0, &udp_do_loopback_cksum, 0, 1148 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1149 CTL_EOL); 1150 } 1151 #endif 1152