1 /* $NetBSD: udp_usrreq.c,v 1.129 2004/12/21 05:51:32 yamt 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 1.129 2004/12/21 05:51:32 yamt 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 static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); 155 #endif 156 #ifdef INET6 157 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 158 struct socket *); 159 static int udp6_realinput (int, struct sockaddr_in6 *, 160 struct sockaddr_in6 *, struct mbuf *, int); 161 static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int); 162 #endif 163 #ifdef INET 164 static void udp_notify (struct inpcb *, int); 165 #endif 166 167 #ifndef UDBHASHSIZE 168 #define UDBHASHSIZE 128 169 #endif 170 int udbhashsize = UDBHASHSIZE; 171 172 #ifdef MBUFTRACE 173 struct mowner udp_mowner = { "udp" }; 174 struct mowner udp_rx_mowner = { "udp", "rx" }; 175 struct mowner udp_tx_mowner = { "udp", "tx" }; 176 #endif 177 178 #ifdef UDP_CSUM_COUNTERS 179 #include <sys/device.h> 180 181 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 182 NULL, "udp", "hwcsum bad"); 183 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 184 NULL, "udp", "hwcsum ok"); 185 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 186 NULL, "udp", "hwcsum data"); 187 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 188 NULL, "udp", "swcsum"); 189 190 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 191 192 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 193 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 194 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 195 EVCNT_ATTACH_STATIC(udp_swcsum); 196 197 #else 198 199 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 200 201 #endif /* UDP_CSUM_COUNTERS */ 202 203 void 204 udp_init(void) 205 { 206 207 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 208 209 MOWNER_ATTACH(&udp_tx_mowner); 210 MOWNER_ATTACH(&udp_rx_mowner); 211 MOWNER_ATTACH(&udp_mowner); 212 } 213 214 /* 215 * Checksum extended UDP header and data. 216 */ 217 218 int 219 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 220 int iphlen, int len) 221 { 222 223 switch (af) { 224 #ifdef INET 225 case AF_INET: 226 return udp4_input_checksum(m, uh, iphlen, len); 227 #endif 228 #ifdef INET6 229 case AF_INET6: 230 return udp6_input_checksum(m, uh, iphlen, len); 231 #endif 232 } 233 #ifdef DIAGNOSTIC 234 panic("udp_input_checksum: unknown af %d", af); 235 #endif 236 /* NOTREACHED */ 237 return -1; 238 } 239 240 #ifdef INET 241 242 /* 243 * Checksum extended UDP header and data. 244 */ 245 246 static int 247 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 248 int iphlen, int len) 249 { 250 251 /* 252 * XXX it's better to record and check if this mbuf is 253 * already checked. 254 */ 255 256 if (uh->uh_sum == 0) 257 return 0; 258 259 switch (m->m_pkthdr.csum_flags & 260 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 261 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 262 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 263 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 264 goto badcsum; 265 266 case M_CSUM_UDPv4|M_CSUM_DATA: { 267 u_int32_t hw_csum = m->m_pkthdr.csum_data; 268 269 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 270 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 271 const struct ip *ip = 272 mtod(m, const struct ip *); 273 274 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 275 ip->ip_dst.s_addr, 276 htons(hw_csum + len + IPPROTO_UDP)); 277 } 278 if ((hw_csum ^ 0xffff) != 0) 279 goto badcsum; 280 break; 281 } 282 283 case M_CSUM_UDPv4: 284 /* Checksum was okay. */ 285 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 286 break; 287 288 default: 289 /* 290 * Need to compute it ourselves. Maybe skip checksum 291 * on loopback interfaces. 292 */ 293 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 294 IFF_LOOPBACK) || 295 udp_do_loopback_cksum)) { 296 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 297 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 298 goto badcsum; 299 } 300 break; 301 } 302 303 return 0; 304 305 badcsum: 306 udpstat.udps_badsum++; 307 return -1; 308 } 309 310 void 311 udp_input(struct mbuf *m, ...) 312 { 313 va_list ap; 314 struct sockaddr_in src, dst; 315 struct ip *ip; 316 struct udphdr *uh; 317 int iphlen; 318 int len; 319 int n; 320 u_int16_t ip_len; 321 322 va_start(ap, m); 323 iphlen = va_arg(ap, int); 324 (void)va_arg(ap, int); /* ignore value, advance ap */ 325 va_end(ap); 326 327 MCLAIM(m, &udp_rx_mowner); 328 udpstat.udps_ipackets++; 329 330 /* 331 * Get IP and UDP header together in first mbuf. 332 */ 333 ip = mtod(m, struct ip *); 334 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 335 if (uh == NULL) { 336 udpstat.udps_hdrops++; 337 return; 338 } 339 KASSERT(UDP_HDR_ALIGNED_P(uh)); 340 341 /* destination port of 0 is illegal, based on RFC768. */ 342 if (uh->uh_dport == 0) 343 goto bad; 344 345 /* 346 * Make mbuf data length reflect UDP length. 347 * If not enough data to reflect UDP length, drop. 348 */ 349 ip_len = ntohs(ip->ip_len); 350 len = ntohs((u_int16_t)uh->uh_ulen); 351 if (ip_len != iphlen + len) { 352 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 353 udpstat.udps_badlen++; 354 goto bad; 355 } 356 m_adj(m, iphlen + len - ip_len); 357 } 358 359 /* 360 * Checksum extended UDP header and data. 361 */ 362 if (udp4_input_checksum(m, uh, iphlen, len)) 363 goto badcsum; 364 365 /* construct source and dst sockaddrs. */ 366 bzero(&src, sizeof(src)); 367 src.sin_family = AF_INET; 368 src.sin_len = sizeof(struct sockaddr_in); 369 bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr)); 370 src.sin_port = uh->uh_sport; 371 bzero(&dst, sizeof(dst)); 372 dst.sin_family = AF_INET; 373 dst.sin_len = sizeof(struct sockaddr_in); 374 bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr)); 375 dst.sin_port = uh->uh_dport; 376 377 n = udp4_realinput(&src, &dst, m, iphlen); 378 #ifdef INET6 379 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 380 struct sockaddr_in6 src6, dst6; 381 382 bzero(&src6, sizeof(src6)); 383 src6.sin6_family = AF_INET6; 384 src6.sin6_len = sizeof(struct sockaddr_in6); 385 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 386 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 387 sizeof(ip->ip_src)); 388 src6.sin6_port = uh->uh_sport; 389 bzero(&dst6, sizeof(dst6)); 390 dst6.sin6_family = AF_INET6; 391 dst6.sin6_len = sizeof(struct sockaddr_in6); 392 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 393 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 394 sizeof(ip->ip_dst)); 395 dst6.sin6_port = uh->uh_dport; 396 397 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 398 } 399 #endif 400 401 if (n == 0) { 402 if (m->m_flags & (M_BCAST | M_MCAST)) { 403 udpstat.udps_noportbcast++; 404 goto bad; 405 } 406 udpstat.udps_noport++; 407 #ifdef IPKDB 408 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 409 m, iphlen + sizeof(struct udphdr), 410 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 411 /* 412 * It was a debugger connect packet, 413 * just drop it now 414 */ 415 goto bad; 416 } 417 #endif 418 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 419 m = NULL; 420 } 421 422 bad: 423 if (m) 424 m_freem(m); 425 return; 426 427 badcsum: 428 m_freem(m); 429 } 430 #endif 431 432 #ifdef INET6 433 static int 434 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 435 { 436 437 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 438 goto good; 439 } 440 if (uh->uh_sum == 0) { 441 udp6stat.udp6s_nosum++; 442 goto bad; 443 } 444 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 445 udp6stat.udp6s_badsum++; 446 goto bad; 447 } 448 449 good: 450 return 0; 451 bad: 452 return -1; 453 } 454 455 int 456 udp6_input(struct mbuf **mp, int *offp, int proto) 457 { 458 struct mbuf *m = *mp; 459 int off = *offp; 460 struct sockaddr_in6 src, dst; 461 struct ip6_hdr *ip6; 462 struct udphdr *uh; 463 u_int32_t plen, ulen; 464 465 ip6 = mtod(m, struct ip6_hdr *); 466 467 #if defined(NFAITH) && 0 < NFAITH 468 if (faithprefix(&ip6->ip6_dst)) { 469 /* send icmp6 host unreach? */ 470 m_freem(m); 471 return IPPROTO_DONE; 472 } 473 #endif 474 475 udp6stat.udp6s_ipackets++; 476 477 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 478 plen = m->m_pkthdr.len - off; 479 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 480 if (uh == NULL) { 481 ip6stat.ip6s_tooshort++; 482 return IPPROTO_DONE; 483 } 484 KASSERT(UDP_HDR_ALIGNED_P(uh)); 485 ulen = ntohs((u_short)uh->uh_ulen); 486 /* 487 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 488 * iff payload length > 0xffff. 489 */ 490 if (ulen == 0 && plen > 0xffff) 491 ulen = plen; 492 493 if (plen != ulen) { 494 udp6stat.udp6s_badlen++; 495 goto bad; 496 } 497 498 /* destination port of 0 is illegal, based on RFC768. */ 499 if (uh->uh_dport == 0) 500 goto bad; 501 502 /* Be proactive about malicious use of IPv4 mapped address */ 503 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 504 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 505 /* XXX stat */ 506 goto bad; 507 } 508 509 /* 510 * Checksum extended UDP header and data. Maybe skip checksum 511 * on loopback interfaces. 512 */ 513 if (udp6_input_checksum(m, uh, off, ulen)) 514 goto bad; 515 516 /* 517 * Construct source and dst sockaddrs. 518 * Note that ifindex (s6_addr16[1]) is already filled. 519 */ 520 bzero(&src, sizeof(src)); 521 src.sin6_family = AF_INET6; 522 src.sin6_len = sizeof(struct sockaddr_in6); 523 /* KAME hack: recover scopeid */ 524 (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif); 525 src.sin6_port = uh->uh_sport; 526 bzero(&dst, sizeof(dst)); 527 dst.sin6_family = AF_INET6; 528 dst.sin6_len = sizeof(struct sockaddr_in6); 529 /* KAME hack: recover scopeid */ 530 (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif); 531 dst.sin6_port = uh->uh_dport; 532 533 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 534 if (m->m_flags & M_MCAST) { 535 udp6stat.udp6s_noportmcast++; 536 goto bad; 537 } 538 udp6stat.udp6s_noport++; 539 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 540 m = NULL; 541 } 542 543 bad: 544 if (m) 545 m_freem(m); 546 return IPPROTO_DONE; 547 } 548 #endif 549 550 #ifdef INET 551 static void 552 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 553 struct sockaddr *src, struct socket *so) 554 { 555 struct mbuf *opts = NULL; 556 struct mbuf *n; 557 struct inpcb *inp = NULL; 558 559 if (!so) 560 return; 561 switch (so->so_proto->pr_domain->dom_family) { 562 case AF_INET: 563 inp = sotoinpcb(so); 564 break; 565 #ifdef INET6 566 case AF_INET6: 567 break; 568 #endif 569 default: 570 return; 571 } 572 573 #if defined(IPSEC) || defined(FAST_IPSEC) 574 /* check AH/ESP integrity. */ 575 if (so != NULL && ipsec4_in_reject_so(m, so)) { 576 ipsecstat.in_polvio++; 577 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 578 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 579 0, 0); 580 return; 581 } 582 #endif /*IPSEC*/ 583 584 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 585 if (inp && (inp->inp_flags & INP_CONTROLOPTS 586 || so->so_options & SO_TIMESTAMP)) { 587 struct ip *ip = mtod(n, struct ip *); 588 ip_savecontrol(inp, &opts, ip, n); 589 } 590 591 m_adj(n, off); 592 if (sbappendaddr(&so->so_rcv, src, n, 593 opts) == 0) { 594 m_freem(n); 595 if (opts) 596 m_freem(opts); 597 so->so_rcv.sb_overflowed++; 598 udpstat.udps_fullsock++; 599 } else 600 sorwakeup(so); 601 } 602 } 603 #endif 604 605 #ifdef INET6 606 static void 607 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 608 struct sockaddr *src, struct socket *so) 609 { 610 struct mbuf *opts = NULL; 611 struct mbuf *n; 612 struct in6pcb *in6p = NULL; 613 614 if (!so) 615 return; 616 if (so->so_proto->pr_domain->dom_family != AF_INET6) 617 return; 618 in6p = sotoin6pcb(so); 619 620 #if defined(IPSEC) || defined(FAST_IPSEC) 621 /* check AH/ESP integrity. */ 622 if (so != NULL && ipsec6_in_reject_so(m, so)) { 623 ipsec6stat.in_polvio++; 624 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 625 icmp6_error(n, ICMP6_DST_UNREACH, 626 ICMP6_DST_UNREACH_ADMIN, 0); 627 return; 628 } 629 #endif /*IPSEC*/ 630 631 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 632 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 633 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 634 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 635 ip6_savecontrol(in6p, &opts, ip6, n); 636 } 637 638 m_adj(n, off); 639 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 640 m_freem(n); 641 if (opts) 642 m_freem(opts); 643 so->so_rcv.sb_overflowed++; 644 udp6stat.udp6s_fullsock++; 645 } else 646 sorwakeup(so); 647 } 648 } 649 #endif 650 651 #ifdef INET 652 static int 653 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 654 struct mbuf *m, int off /* offset of udphdr */) 655 { 656 u_int16_t *sport, *dport; 657 int rcvcnt; 658 struct in_addr *src4, *dst4; 659 struct inpcb_hdr *inph; 660 struct inpcb *inp; 661 662 rcvcnt = 0; 663 off += sizeof(struct udphdr); /* now, offset of payload */ 664 665 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 666 goto bad; 667 668 src4 = &src->sin_addr; 669 sport = &src->sin_port; 670 dst4 = &dst->sin_addr; 671 dport = &dst->sin_port; 672 673 if (IN_MULTICAST(dst4->s_addr) || 674 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 675 /* 676 * Deliver a multicast or broadcast datagram to *all* sockets 677 * for which the local and remote addresses and ports match 678 * those of the incoming datagram. This allows more than 679 * one process to receive multi/broadcasts on the same port. 680 * (This really ought to be done for unicast datagrams as 681 * well, but that would cause problems with existing 682 * applications that open both address-specific sockets and 683 * a wildcard socket listening to the same port -- they would 684 * end up receiving duplicates of every unicast datagram. 685 * Those applications open the multiple sockets to overcome an 686 * inadequacy of the UDP socket interface, but for backwards 687 * compatibility we avoid the problem here rather than 688 * fixing the interface. Maybe 4.5BSD will remedy this?) 689 */ 690 691 /* 692 * KAME note: traditionally we dropped udpiphdr from mbuf here. 693 * we need udpiphdr for IPsec processing so we do that later. 694 */ 695 /* 696 * Locate pcb(s) for datagram. 697 */ 698 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 699 inp = (struct inpcb *)inph; 700 if (inp->inp_af != AF_INET) 701 continue; 702 703 if (inp->inp_lport != *dport) 704 continue; 705 if (!in_nullhost(inp->inp_laddr)) { 706 if (!in_hosteq(inp->inp_laddr, *dst4)) 707 continue; 708 } 709 if (!in_nullhost(inp->inp_faddr)) { 710 if (!in_hosteq(inp->inp_faddr, *src4) || 711 inp->inp_fport != *sport) 712 continue; 713 } 714 715 udp4_sendup(m, off, (struct sockaddr *)src, 716 inp->inp_socket); 717 rcvcnt++; 718 719 /* 720 * Don't look for additional matches if this one does 721 * not have either the SO_REUSEPORT or SO_REUSEADDR 722 * socket options set. This heuristic avoids searching 723 * through all pcbs in the common case of a non-shared 724 * port. It assumes that an application will never 725 * clear these options after setting them. 726 */ 727 if ((inp->inp_socket->so_options & 728 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 729 break; 730 } 731 } else { 732 /* 733 * Locate pcb for datagram. 734 */ 735 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 736 if (inp == 0) { 737 ++udpstat.udps_pcbhashmiss; 738 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 739 if (inp == 0) 740 return rcvcnt; 741 } 742 743 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 744 rcvcnt++; 745 } 746 747 bad: 748 return rcvcnt; 749 } 750 #endif 751 752 #ifdef INET6 753 static int 754 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 755 struct mbuf *m, int off) 756 { 757 u_int16_t sport, dport; 758 int rcvcnt; 759 struct in6_addr src6, dst6; 760 const struct in_addr *dst4; 761 struct inpcb_hdr *inph; 762 struct in6pcb *in6p; 763 764 rcvcnt = 0; 765 off += sizeof(struct udphdr); /* now, offset of payload */ 766 767 if (af != AF_INET && af != AF_INET6) 768 goto bad; 769 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 770 goto bad; 771 772 in6_embedscope(&src6, src, NULL, NULL); 773 sport = src->sin6_port; 774 in6_embedscope(&dst6, dst, NULL, NULL); 775 dport = dst->sin6_port; 776 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 777 778 if (IN6_IS_ADDR_MULTICAST(&dst6) || 779 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 780 /* 781 * Deliver a multicast or broadcast datagram to *all* sockets 782 * for which the local and remote addresses and ports match 783 * those of the incoming datagram. This allows more than 784 * one process to receive multi/broadcasts on the same port. 785 * (This really ought to be done for unicast datagrams as 786 * well, but that would cause problems with existing 787 * applications that open both address-specific sockets and 788 * a wildcard socket listening to the same port -- they would 789 * end up receiving duplicates of every unicast datagram. 790 * Those applications open the multiple sockets to overcome an 791 * inadequacy of the UDP socket interface, but for backwards 792 * compatibility we avoid the problem here rather than 793 * fixing the interface. Maybe 4.5BSD will remedy this?) 794 */ 795 796 /* 797 * KAME note: traditionally we dropped udpiphdr from mbuf here. 798 * we need udpiphdr for IPsec processing so we do that later. 799 */ 800 /* 801 * Locate pcb(s) for datagram. 802 */ 803 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 804 in6p = (struct in6pcb *)inph; 805 if (in6p->in6p_af != AF_INET6) 806 continue; 807 808 if (in6p->in6p_lport != dport) 809 continue; 810 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 811 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6)) 812 continue; 813 } else { 814 if (IN6_IS_ADDR_V4MAPPED(&dst6) && 815 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 816 continue; 817 } 818 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 819 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 820 &src6) || in6p->in6p_fport != sport) 821 continue; 822 } else { 823 if (IN6_IS_ADDR_V4MAPPED(&src6) && 824 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 825 continue; 826 } 827 828 udp6_sendup(m, off, (struct sockaddr *)src, 829 in6p->in6p_socket); 830 rcvcnt++; 831 832 /* 833 * Don't look for additional matches if this one does 834 * not have either the SO_REUSEPORT or SO_REUSEADDR 835 * socket options set. This heuristic avoids searching 836 * through all pcbs in the common case of a non-shared 837 * port. It assumes that an application will never 838 * clear these options after setting them. 839 */ 840 if ((in6p->in6p_socket->so_options & 841 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 842 break; 843 } 844 } else { 845 /* 846 * Locate pcb for datagram. 847 */ 848 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, 849 &dst6, dport, 0); 850 if (in6p == 0) { 851 ++udpstat.udps_pcbhashmiss; 852 in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0); 853 if (in6p == 0) 854 return rcvcnt; 855 } 856 857 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 858 rcvcnt++; 859 } 860 861 bad: 862 return rcvcnt; 863 } 864 #endif 865 866 #ifdef INET 867 /* 868 * Notify a udp user of an asynchronous error; 869 * just wake up so that he can collect error status. 870 */ 871 static void 872 udp_notify(struct inpcb *inp, int errno) 873 { 874 inp->inp_socket->so_error = errno; 875 sorwakeup(inp->inp_socket); 876 sowwakeup(inp->inp_socket); 877 } 878 879 void * 880 udp_ctlinput(int cmd, struct sockaddr *sa, void *v) 881 { 882 struct ip *ip = v; 883 struct udphdr *uh; 884 void (*notify)(struct inpcb *, int) = udp_notify; 885 int errno; 886 887 if (sa->sa_family != AF_INET 888 || sa->sa_len != sizeof(struct sockaddr_in)) 889 return NULL; 890 if ((unsigned)cmd >= PRC_NCMDS) 891 return NULL; 892 errno = inetctlerrmap[cmd]; 893 if (PRC_IS_REDIRECT(cmd)) 894 notify = in_rtchange, ip = 0; 895 else if (cmd == PRC_HOSTDEAD) 896 ip = 0; 897 else if (errno == 0) 898 return NULL; 899 if (ip) { 900 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 901 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 902 ip->ip_src, uh->uh_sport, errno, notify); 903 904 /* XXX mapped address case */ 905 } else 906 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 907 notify); 908 return NULL; 909 } 910 911 int 912 udp_output(struct mbuf *m, ...) 913 { 914 struct inpcb *inp; 915 struct udpiphdr *ui; 916 struct route *ro; 917 int len = m->m_pkthdr.len; 918 int error = 0; 919 va_list ap; 920 921 MCLAIM(m, &udp_tx_mowner); 922 va_start(ap, m); 923 inp = va_arg(ap, struct inpcb *); 924 va_end(ap); 925 926 /* 927 * Calculate data length and get a mbuf 928 * for UDP and IP headers. 929 */ 930 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 931 if (m == 0) { 932 error = ENOBUFS; 933 goto release; 934 } 935 936 /* 937 * Compute the packet length of the IP header, and 938 * punt if the length looks bogus. 939 */ 940 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 941 error = EMSGSIZE; 942 goto release; 943 } 944 945 /* 946 * Fill in mbuf with extended UDP header 947 * and addresses and length put into network format. 948 */ 949 ui = mtod(m, struct udpiphdr *); 950 ui->ui_pr = IPPROTO_UDP; 951 ui->ui_src = inp->inp_laddr; 952 ui->ui_dst = inp->inp_faddr; 953 ui->ui_sport = inp->inp_lport; 954 ui->ui_dport = inp->inp_fport; 955 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 956 957 ro = &inp->inp_route; 958 959 /* 960 * Set up checksum and output datagram. 961 */ 962 if (udpcksum) { 963 /* 964 * XXX Cache pseudo-header checksum part for 965 * XXX "connected" UDP sockets. 966 * Maybe skip checksums on loopback interfaces. 967 */ 968 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 969 ui->ui_dst.s_addr, htons((u_int16_t)len + 970 sizeof(struct udphdr) + IPPROTO_UDP)); 971 if (__predict_true(ro->ro_rt == NULL || 972 !(ro->ro_rt->rt_ifp->if_flags & 973 IFF_LOOPBACK) || 974 udp_do_loopback_cksum)) 975 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 976 else 977 m->m_pkthdr.csum_flags = 0; 978 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 979 } else 980 ui->ui_sum = 0; 981 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 982 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 983 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 984 udpstat.udps_opackets++; 985 986 return (ip_output(m, inp->inp_options, ro, 987 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 988 inp->inp_moptions, inp->inp_socket)); 989 990 release: 991 m_freem(m); 992 return (error); 993 } 994 995 int udp_sendspace = 9216; /* really max datagram size */ 996 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 997 /* 40 1K datagrams */ 998 999 /*ARGSUSED*/ 1000 int 1001 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1002 struct mbuf *control, struct proc *p) 1003 { 1004 struct inpcb *inp; 1005 int s; 1006 int error = 0; 1007 1008 if (req == PRU_CONTROL) 1009 return (in_control(so, (long)m, (caddr_t)nam, 1010 (struct ifnet *)control, p)); 1011 1012 if (req == PRU_PURGEIF) { 1013 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1014 in_purgeif((struct ifnet *)control); 1015 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1016 return (0); 1017 } 1018 1019 s = splsoftnet(); 1020 inp = sotoinpcb(so); 1021 #ifdef DIAGNOSTIC 1022 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1023 panic("udp_usrreq: unexpected control mbuf"); 1024 #endif 1025 if (inp == 0 && req != PRU_ATTACH) { 1026 error = EINVAL; 1027 goto release; 1028 } 1029 1030 /* 1031 * Note: need to block udp_input while changing 1032 * the udp pcb queue and/or pcb addresses. 1033 */ 1034 switch (req) { 1035 1036 case PRU_ATTACH: 1037 if (inp != 0) { 1038 error = EISCONN; 1039 break; 1040 } 1041 #ifdef MBUFTRACE 1042 so->so_mowner = &udp_mowner; 1043 so->so_rcv.sb_mowner = &udp_rx_mowner; 1044 so->so_snd.sb_mowner = &udp_tx_mowner; 1045 #endif 1046 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1047 error = soreserve(so, udp_sendspace, udp_recvspace); 1048 if (error) 1049 break; 1050 } 1051 error = in_pcballoc(so, &udbtable); 1052 if (error) 1053 break; 1054 inp = sotoinpcb(so); 1055 inp->inp_ip.ip_ttl = ip_defttl; 1056 break; 1057 1058 case PRU_DETACH: 1059 in_pcbdetach(inp); 1060 break; 1061 1062 case PRU_BIND: 1063 error = in_pcbbind(inp, nam, p); 1064 break; 1065 1066 case PRU_LISTEN: 1067 error = EOPNOTSUPP; 1068 break; 1069 1070 case PRU_CONNECT: 1071 error = in_pcbconnect(inp, nam); 1072 if (error) 1073 break; 1074 soisconnected(so); 1075 break; 1076 1077 case PRU_CONNECT2: 1078 error = EOPNOTSUPP; 1079 break; 1080 1081 case PRU_DISCONNECT: 1082 /*soisdisconnected(so);*/ 1083 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1084 in_pcbdisconnect(inp); 1085 inp->inp_laddr = zeroin_addr; /* XXX */ 1086 in_pcbstate(inp, INP_BOUND); /* XXX */ 1087 break; 1088 1089 case PRU_SHUTDOWN: 1090 socantsendmore(so); 1091 break; 1092 1093 case PRU_RCVD: 1094 error = EOPNOTSUPP; 1095 break; 1096 1097 case PRU_SEND: 1098 if (control && control->m_len) { 1099 m_freem(control); 1100 m_freem(m); 1101 error = EINVAL; 1102 break; 1103 } 1104 { 1105 struct in_addr laddr; /* XXX */ 1106 1107 if (nam) { 1108 laddr = inp->inp_laddr; /* XXX */ 1109 if ((so->so_state & SS_ISCONNECTED) != 0) { 1110 error = EISCONN; 1111 goto die; 1112 } 1113 error = in_pcbconnect(inp, nam); 1114 if (error) 1115 goto die; 1116 } else { 1117 if ((so->so_state & SS_ISCONNECTED) == 0) { 1118 error = ENOTCONN; 1119 goto die; 1120 } 1121 } 1122 error = udp_output(m, inp); 1123 m = NULL; 1124 if (nam) { 1125 in_pcbdisconnect(inp); 1126 inp->inp_laddr = laddr; /* XXX */ 1127 in_pcbstate(inp, INP_BOUND); /* XXX */ 1128 } 1129 die: 1130 if (m) 1131 m_freem(m); 1132 } 1133 break; 1134 1135 case PRU_SENSE: 1136 /* 1137 * stat: don't bother with a blocksize. 1138 */ 1139 splx(s); 1140 return (0); 1141 1142 case PRU_RCVOOB: 1143 error = EOPNOTSUPP; 1144 break; 1145 1146 case PRU_SENDOOB: 1147 m_freem(control); 1148 m_freem(m); 1149 error = EOPNOTSUPP; 1150 break; 1151 1152 case PRU_SOCKADDR: 1153 in_setsockaddr(inp, nam); 1154 break; 1155 1156 case PRU_PEERADDR: 1157 in_setpeeraddr(inp, nam); 1158 break; 1159 1160 default: 1161 panic("udp_usrreq"); 1162 } 1163 1164 release: 1165 splx(s); 1166 return (error); 1167 } 1168 1169 /* 1170 * Sysctl for udp variables. 1171 */ 1172 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1173 { 1174 1175 sysctl_createv(clog, 0, NULL, NULL, 1176 CTLFLAG_PERMANENT, 1177 CTLTYPE_NODE, "net", NULL, 1178 NULL, 0, NULL, 0, 1179 CTL_NET, CTL_EOL); 1180 sysctl_createv(clog, 0, NULL, NULL, 1181 CTLFLAG_PERMANENT, 1182 CTLTYPE_NODE, "inet", NULL, 1183 NULL, 0, NULL, 0, 1184 CTL_NET, PF_INET, CTL_EOL); 1185 sysctl_createv(clog, 0, NULL, NULL, 1186 CTLFLAG_PERMANENT, 1187 CTLTYPE_NODE, "udp", 1188 SYSCTL_DESCR("UDPv4 related settings"), 1189 NULL, 0, NULL, 0, 1190 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1191 1192 sysctl_createv(clog, 0, NULL, NULL, 1193 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1194 CTLTYPE_INT, "checksum", 1195 SYSCTL_DESCR("Compute UDP checksums"), 1196 NULL, 0, &udpcksum, 0, 1197 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1198 CTL_EOL); 1199 sysctl_createv(clog, 0, NULL, NULL, 1200 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1201 CTLTYPE_INT, "sendspace", 1202 SYSCTL_DESCR("Default UDP send buffer size"), 1203 NULL, 0, &udp_sendspace, 0, 1204 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1205 CTL_EOL); 1206 sysctl_createv(clog, 0, NULL, NULL, 1207 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1208 CTLTYPE_INT, "recvspace", 1209 SYSCTL_DESCR("Default UDP receive buffer size"), 1210 NULL, 0, &udp_recvspace, 0, 1211 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1212 CTL_EOL); 1213 sysctl_createv(clog, 0, NULL, NULL, 1214 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1215 CTLTYPE_INT, "do_loopback_cksum", 1216 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1217 NULL, 0, &udp_do_loopback_cksum, 0, 1218 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1219 CTL_EOL); 1220 } 1221 #endif 1222