udp_usrreq.c revision 1.134.2.6
1 /* $NetBSD: udp_usrreq.c,v 1.134.2.6 2005/12/29 16:10:18 riz 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 1.134.2.6 2005/12/29 16:10:18 riz 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 IPSEC_NAT_T 99 #include <netinet6/ipsec.h> 100 #include <netinet6/esp.h> 101 #endif 102 103 #ifdef INET6 104 #include <netinet/ip6.h> 105 #include <netinet/icmp6.h> 106 #include <netinet6/ip6_var.h> 107 #include <netinet6/in6_pcb.h> 108 #include <netinet6/udp6_var.h> 109 #endif 110 111 #ifndef INET6 112 /* always need ip6.h for IP6_EXTHDR_GET */ 113 #include <netinet/ip6.h> 114 #endif 115 116 #include "faith.h" 117 #if defined(NFAITH) && NFAITH > 0 118 #include <net/if_faith.h> 119 #endif 120 121 #include <machine/stdarg.h> 122 123 #ifdef FAST_IPSEC 124 #include <netipsec/ipsec.h> 125 #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */ 126 #ifdef INET6 127 #include <netipsec/ipsec6.h> 128 #endif 129 #endif /* FAST_IPSEC*/ 130 131 #ifdef IPSEC 132 #include <netinet6/ipsec.h> 133 #include <netkey/key.h> 134 #endif /*IPSEC*/ 135 136 #ifdef IPKDB 137 #include <ipkdb/ipkdb.h> 138 #endif 139 140 /* 141 * UDP protocol implementation. 142 * Per RFC 768, August, 1980. 143 */ 144 #ifndef COMPAT_42 145 int udpcksum = 1; 146 #else 147 int udpcksum = 0; /* XXX */ 148 #endif 149 150 struct inpcbtable udbtable; 151 struct udpstat udpstat; 152 153 #ifdef INET 154 #ifdef IPSEC_NAT_T 155 static int udp4_espinudp (struct mbuf **, int, struct sockaddr *, 156 struct socket *); 157 #endif 158 static void udp4_sendup (struct mbuf *, int, struct sockaddr *, 159 struct socket *); 160 static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, 161 struct mbuf **, int); 162 static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); 163 #endif 164 #ifdef INET6 165 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 166 struct socket *); 167 static int udp6_realinput (int, struct sockaddr_in6 *, 168 struct sockaddr_in6 *, struct mbuf *, int); 169 static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int); 170 #endif 171 #ifdef INET 172 static void udp_notify (struct inpcb *, int); 173 #endif 174 175 #ifndef UDBHASHSIZE 176 #define UDBHASHSIZE 128 177 #endif 178 int udbhashsize = UDBHASHSIZE; 179 180 #ifdef MBUFTRACE 181 struct mowner udp_mowner = { "udp" }; 182 struct mowner udp_rx_mowner = { "udp", "rx" }; 183 struct mowner udp_tx_mowner = { "udp", "tx" }; 184 #endif 185 186 #ifdef UDP_CSUM_COUNTERS 187 #include <sys/device.h> 188 189 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 190 NULL, "udp", "hwcsum bad"); 191 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 192 NULL, "udp", "hwcsum ok"); 193 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 194 NULL, "udp", "hwcsum data"); 195 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 196 NULL, "udp", "swcsum"); 197 198 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 199 200 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 201 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 202 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 203 EVCNT_ATTACH_STATIC(udp_swcsum); 204 205 #else 206 207 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 208 209 #endif /* UDP_CSUM_COUNTERS */ 210 211 void 212 udp_init(void) 213 { 214 215 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 216 217 MOWNER_ATTACH(&udp_tx_mowner); 218 MOWNER_ATTACH(&udp_rx_mowner); 219 MOWNER_ATTACH(&udp_mowner); 220 } 221 222 /* 223 * Checksum extended UDP header and data. 224 */ 225 226 int 227 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 228 int iphlen, int len) 229 { 230 231 switch (af) { 232 #ifdef INET 233 case AF_INET: 234 return udp4_input_checksum(m, uh, iphlen, len); 235 #endif 236 #ifdef INET6 237 case AF_INET6: 238 return udp6_input_checksum(m, uh, iphlen, len); 239 #endif 240 } 241 #ifdef DIAGNOSTIC 242 panic("udp_input_checksum: unknown af %d", af); 243 #endif 244 /* NOTREACHED */ 245 return -1; 246 } 247 248 #ifdef INET 249 250 /* 251 * Checksum extended UDP header and data. 252 */ 253 254 static int 255 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 256 int iphlen, int len) 257 { 258 259 /* 260 * XXX it's better to record and check if this mbuf is 261 * already checked. 262 */ 263 264 if (uh->uh_sum == 0) 265 return 0; 266 267 switch (m->m_pkthdr.csum_flags & 268 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 269 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 270 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 271 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 272 goto badcsum; 273 274 case M_CSUM_UDPv4|M_CSUM_DATA: { 275 u_int32_t hw_csum = m->m_pkthdr.csum_data; 276 277 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 278 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 279 const struct ip *ip = 280 mtod(m, const struct ip *); 281 282 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 283 ip->ip_dst.s_addr, 284 htons(hw_csum + len + IPPROTO_UDP)); 285 } 286 if ((hw_csum ^ 0xffff) != 0) 287 goto badcsum; 288 break; 289 } 290 291 case M_CSUM_UDPv4: 292 /* Checksum was okay. */ 293 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 294 break; 295 296 default: 297 /* 298 * Need to compute it ourselves. Maybe skip checksum 299 * on loopback interfaces. 300 */ 301 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 302 IFF_LOOPBACK) || 303 udp_do_loopback_cksum)) { 304 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 305 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 306 goto badcsum; 307 } 308 break; 309 } 310 311 return 0; 312 313 badcsum: 314 udpstat.udps_badsum++; 315 return -1; 316 } 317 318 void 319 udp_input(struct mbuf *m, ...) 320 { 321 va_list ap; 322 struct sockaddr_in src, dst; 323 struct ip *ip; 324 struct udphdr *uh; 325 int iphlen; 326 int len; 327 int n; 328 u_int16_t ip_len; 329 330 va_start(ap, m); 331 iphlen = va_arg(ap, int); 332 (void)va_arg(ap, int); /* ignore value, advance ap */ 333 va_end(ap); 334 335 MCLAIM(m, &udp_rx_mowner); 336 udpstat.udps_ipackets++; 337 338 /* 339 * Get IP and UDP header together in first mbuf. 340 */ 341 ip = mtod(m, struct ip *); 342 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 343 if (uh == NULL) { 344 udpstat.udps_hdrops++; 345 return; 346 } 347 KASSERT(UDP_HDR_ALIGNED_P(uh)); 348 349 /* destination port of 0 is illegal, based on RFC768. */ 350 if (uh->uh_dport == 0) 351 goto bad; 352 353 /* 354 * Make mbuf data length reflect UDP length. 355 * If not enough data to reflect UDP length, drop. 356 */ 357 ip_len = ntohs(ip->ip_len); 358 len = ntohs((u_int16_t)uh->uh_ulen); 359 if (ip_len != iphlen + len) { 360 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 361 udpstat.udps_badlen++; 362 goto bad; 363 } 364 m_adj(m, iphlen + len - ip_len); 365 } 366 367 /* 368 * Checksum extended UDP header and data. 369 */ 370 if (udp4_input_checksum(m, uh, iphlen, len)) 371 goto badcsum; 372 373 /* construct source and dst sockaddrs. */ 374 bzero(&src, sizeof(src)); 375 src.sin_family = AF_INET; 376 src.sin_len = sizeof(struct sockaddr_in); 377 bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr)); 378 src.sin_port = uh->uh_sport; 379 bzero(&dst, sizeof(dst)); 380 dst.sin_family = AF_INET; 381 dst.sin_len = sizeof(struct sockaddr_in); 382 bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr)); 383 dst.sin_port = uh->uh_dport; 384 385 if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { 386 udpstat.udps_hdrops++; 387 return; 388 } 389 #ifdef INET6 390 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 391 struct sockaddr_in6 src6, dst6; 392 393 bzero(&src6, sizeof(src6)); 394 src6.sin6_family = AF_INET6; 395 src6.sin6_len = sizeof(struct sockaddr_in6); 396 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 397 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 398 sizeof(ip->ip_src)); 399 src6.sin6_port = uh->uh_sport; 400 bzero(&dst6, sizeof(dst6)); 401 dst6.sin6_family = AF_INET6; 402 dst6.sin6_len = sizeof(struct sockaddr_in6); 403 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 404 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 405 sizeof(ip->ip_dst)); 406 dst6.sin6_port = uh->uh_dport; 407 408 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 409 } 410 #endif 411 412 if (n == 0) { 413 if (m->m_flags & (M_BCAST | M_MCAST)) { 414 udpstat.udps_noportbcast++; 415 goto bad; 416 } 417 udpstat.udps_noport++; 418 #ifdef IPKDB 419 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 420 m, iphlen + sizeof(struct udphdr), 421 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 422 /* 423 * It was a debugger connect packet, 424 * just drop it now 425 */ 426 goto bad; 427 } 428 #endif 429 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 430 m = NULL; 431 } 432 433 bad: 434 if (m) 435 m_freem(m); 436 return; 437 438 badcsum: 439 m_freem(m); 440 } 441 #endif 442 443 #ifdef INET6 444 static int 445 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 446 { 447 448 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 449 goto good; 450 } 451 if (uh->uh_sum == 0) { 452 udp6stat.udp6s_nosum++; 453 goto bad; 454 } 455 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 456 udp6stat.udp6s_badsum++; 457 goto bad; 458 } 459 460 good: 461 return 0; 462 bad: 463 return -1; 464 } 465 466 int 467 udp6_input(struct mbuf **mp, int *offp, int proto) 468 { 469 struct mbuf *m = *mp; 470 int off = *offp; 471 struct sockaddr_in6 src, dst; 472 struct ip6_hdr *ip6; 473 struct udphdr *uh; 474 u_int32_t plen, ulen; 475 476 ip6 = mtod(m, struct ip6_hdr *); 477 478 #if defined(NFAITH) && 0 < NFAITH 479 if (faithprefix(&ip6->ip6_dst)) { 480 /* send icmp6 host unreach? */ 481 m_freem(m); 482 return IPPROTO_DONE; 483 } 484 #endif 485 486 udp6stat.udp6s_ipackets++; 487 488 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 489 plen = m->m_pkthdr.len - off; 490 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 491 if (uh == NULL) { 492 ip6stat.ip6s_tooshort++; 493 return IPPROTO_DONE; 494 } 495 KASSERT(UDP_HDR_ALIGNED_P(uh)); 496 ulen = ntohs((u_short)uh->uh_ulen); 497 /* 498 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 499 * iff payload length > 0xffff. 500 */ 501 if (ulen == 0 && plen > 0xffff) 502 ulen = plen; 503 504 if (plen != ulen) { 505 udp6stat.udp6s_badlen++; 506 goto bad; 507 } 508 509 /* destination port of 0 is illegal, based on RFC768. */ 510 if (uh->uh_dport == 0) 511 goto bad; 512 513 /* Be proactive about malicious use of IPv4 mapped address */ 514 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 515 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 516 /* XXX stat */ 517 goto bad; 518 } 519 520 /* 521 * Checksum extended UDP header and data. Maybe skip checksum 522 * on loopback interfaces. 523 */ 524 if (udp6_input_checksum(m, uh, off, ulen)) 525 goto bad; 526 527 /* 528 * Construct source and dst sockaddrs. 529 * Note that ifindex (s6_addr16[1]) is already filled. 530 */ 531 bzero(&src, sizeof(src)); 532 src.sin6_family = AF_INET6; 533 src.sin6_len = sizeof(struct sockaddr_in6); 534 /* KAME hack: recover scopeid */ 535 (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif); 536 src.sin6_port = uh->uh_sport; 537 bzero(&dst, sizeof(dst)); 538 dst.sin6_family = AF_INET6; 539 dst.sin6_len = sizeof(struct sockaddr_in6); 540 /* KAME hack: recover scopeid */ 541 (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif); 542 dst.sin6_port = uh->uh_dport; 543 544 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 545 if (m->m_flags & M_MCAST) { 546 udp6stat.udp6s_noportmcast++; 547 goto bad; 548 } 549 udp6stat.udp6s_noport++; 550 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 551 m = NULL; 552 } 553 554 bad: 555 if (m) 556 m_freem(m); 557 return IPPROTO_DONE; 558 } 559 #endif 560 561 #ifdef INET 562 static void 563 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 564 struct sockaddr *src, struct socket *so) 565 { 566 struct mbuf *opts = NULL; 567 struct mbuf *n; 568 struct inpcb *inp = NULL; 569 570 if (!so) 571 return; 572 switch (so->so_proto->pr_domain->dom_family) { 573 case AF_INET: 574 inp = sotoinpcb(so); 575 break; 576 #ifdef INET6 577 case AF_INET6: 578 break; 579 #endif 580 default: 581 return; 582 } 583 584 #if defined(IPSEC) || defined(FAST_IPSEC) 585 /* check AH/ESP integrity. */ 586 if (so != NULL && ipsec4_in_reject_so(m, so)) { 587 ipsecstat.in_polvio++; 588 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 589 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 590 0, 0); 591 return; 592 } 593 #endif /*IPSEC*/ 594 595 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 596 if (inp && (inp->inp_flags & INP_CONTROLOPTS 597 || so->so_options & SO_TIMESTAMP)) { 598 struct ip *ip = mtod(n, struct ip *); 599 ip_savecontrol(inp, &opts, ip, n); 600 } 601 602 m_adj(n, off); 603 if (sbappendaddr(&so->so_rcv, src, n, 604 opts) == 0) { 605 m_freem(n); 606 if (opts) 607 m_freem(opts); 608 so->so_rcv.sb_overflowed++; 609 udpstat.udps_fullsock++; 610 } else 611 sorwakeup(so); 612 } 613 } 614 #endif 615 616 #ifdef INET6 617 static void 618 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 619 struct sockaddr *src, struct socket *so) 620 { 621 struct mbuf *opts = NULL; 622 struct mbuf *n; 623 struct in6pcb *in6p = NULL; 624 625 if (!so) 626 return; 627 if (so->so_proto->pr_domain->dom_family != AF_INET6) 628 return; 629 in6p = sotoin6pcb(so); 630 631 #if defined(IPSEC) || defined(FAST_IPSEC) 632 /* check AH/ESP integrity. */ 633 if (so != NULL && ipsec6_in_reject_so(m, so)) { 634 ipsec6stat.in_polvio++; 635 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 636 icmp6_error(n, ICMP6_DST_UNREACH, 637 ICMP6_DST_UNREACH_ADMIN, 0); 638 return; 639 } 640 #endif /*IPSEC*/ 641 642 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 643 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 644 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 645 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 646 ip6_savecontrol(in6p, &opts, ip6, n); 647 } 648 649 m_adj(n, off); 650 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 651 m_freem(n); 652 if (opts) 653 m_freem(opts); 654 so->so_rcv.sb_overflowed++; 655 udp6stat.udp6s_fullsock++; 656 } else 657 sorwakeup(so); 658 } 659 } 660 #endif 661 662 #ifdef INET 663 static int 664 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 665 struct mbuf **mp, int off /* offset of udphdr */) 666 { 667 u_int16_t *sport, *dport; 668 int rcvcnt; 669 struct in_addr *src4, *dst4; 670 struct inpcb_hdr *inph; 671 struct inpcb *inp; 672 struct mbuf *m = *mp; 673 674 rcvcnt = 0; 675 off += sizeof(struct udphdr); /* now, offset of payload */ 676 677 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 678 goto bad; 679 680 src4 = &src->sin_addr; 681 sport = &src->sin_port; 682 dst4 = &dst->sin_addr; 683 dport = &dst->sin_port; 684 685 if (IN_MULTICAST(dst4->s_addr) || 686 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 687 /* 688 * Deliver a multicast or broadcast datagram to *all* sockets 689 * for which the local and remote addresses and ports match 690 * those of the incoming datagram. This allows more than 691 * one process to receive multi/broadcasts on the same port. 692 * (This really ought to be done for unicast datagrams as 693 * well, but that would cause problems with existing 694 * applications that open both address-specific sockets and 695 * a wildcard socket listening to the same port -- they would 696 * end up receiving duplicates of every unicast datagram. 697 * Those applications open the multiple sockets to overcome an 698 * inadequacy of the UDP socket interface, but for backwards 699 * compatibility we avoid the problem here rather than 700 * fixing the interface. Maybe 4.5BSD will remedy this?) 701 */ 702 703 /* 704 * KAME note: traditionally we dropped udpiphdr from mbuf here. 705 * we need udpiphdr for IPsec processing so we do that later. 706 */ 707 /* 708 * Locate pcb(s) for datagram. 709 */ 710 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 711 inp = (struct inpcb *)inph; 712 if (inp->inp_af != AF_INET) 713 continue; 714 715 if (inp->inp_lport != *dport) 716 continue; 717 if (!in_nullhost(inp->inp_laddr)) { 718 if (!in_hosteq(inp->inp_laddr, *dst4)) 719 continue; 720 } 721 if (!in_nullhost(inp->inp_faddr)) { 722 if (!in_hosteq(inp->inp_faddr, *src4) || 723 inp->inp_fport != *sport) 724 continue; 725 } 726 727 udp4_sendup(m, off, (struct sockaddr *)src, 728 inp->inp_socket); 729 rcvcnt++; 730 731 /* 732 * Don't look for additional matches if this one does 733 * not have either the SO_REUSEPORT or SO_REUSEADDR 734 * socket options set. This heuristic avoids searching 735 * through all pcbs in the common case of a non-shared 736 * port. It assumes that an application will never 737 * clear these options after setting them. 738 */ 739 if ((inp->inp_socket->so_options & 740 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 741 break; 742 } 743 } else { 744 /* 745 * Locate pcb for datagram. 746 */ 747 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 748 if (inp == 0) { 749 ++udpstat.udps_pcbhashmiss; 750 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 751 if (inp == 0) 752 return rcvcnt; 753 } 754 755 #ifdef IPSEC_NAT_T 756 /* Handle ESP over UDP */ 757 if (inp->inp_flags & INP_ESPINUDP_ALL) { 758 struct sockaddr *sa = (struct sockaddr *)src; 759 760 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 761 case -1: /* Error, m was freeed */ 762 rcvcnt = -1; 763 goto bad; 764 break; 765 766 case 1: /* ESP over UDP */ 767 rcvcnt++; 768 goto bad; 769 break; 770 771 case 0: /* plain UDP */ 772 default: /* Unexpected */ 773 /* 774 * Normal UDP processing will take place 775 * m may have changed. 776 */ 777 m = *mp; 778 break; 779 } 780 } 781 #endif 782 783 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 784 rcvcnt++; 785 } 786 787 bad: 788 return rcvcnt; 789 } 790 #endif 791 792 #ifdef INET6 793 static int 794 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 795 struct mbuf *m, int off) 796 { 797 u_int16_t sport, dport; 798 int rcvcnt; 799 struct in6_addr src6, dst6; 800 const struct in_addr *dst4; 801 struct inpcb_hdr *inph; 802 struct in6pcb *in6p; 803 804 rcvcnt = 0; 805 off += sizeof(struct udphdr); /* now, offset of payload */ 806 807 if (af != AF_INET && af != AF_INET6) 808 goto bad; 809 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 810 goto bad; 811 812 in6_embedscope(&src6, src, NULL, NULL); 813 sport = src->sin6_port; 814 in6_embedscope(&dst6, dst, NULL, NULL); 815 dport = dst->sin6_port; 816 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 817 818 if (IN6_IS_ADDR_MULTICAST(&dst6) || 819 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 820 /* 821 * Deliver a multicast or broadcast datagram to *all* sockets 822 * for which the local and remote addresses and ports match 823 * those of the incoming datagram. This allows more than 824 * one process to receive multi/broadcasts on the same port. 825 * (This really ought to be done for unicast datagrams as 826 * well, but that would cause problems with existing 827 * applications that open both address-specific sockets and 828 * a wildcard socket listening to the same port -- they would 829 * end up receiving duplicates of every unicast datagram. 830 * Those applications open the multiple sockets to overcome an 831 * inadequacy of the UDP socket interface, but for backwards 832 * compatibility we avoid the problem here rather than 833 * fixing the interface. Maybe 4.5BSD will remedy this?) 834 */ 835 836 /* 837 * KAME note: traditionally we dropped udpiphdr from mbuf here. 838 * we need udpiphdr for IPsec processing so we do that later. 839 */ 840 /* 841 * Locate pcb(s) for datagram. 842 */ 843 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 844 in6p = (struct in6pcb *)inph; 845 if (in6p->in6p_af != AF_INET6) 846 continue; 847 848 if (in6p->in6p_lport != dport) 849 continue; 850 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 851 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6)) 852 continue; 853 } else { 854 if (IN6_IS_ADDR_V4MAPPED(&dst6) && 855 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 856 continue; 857 } 858 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 859 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 860 &src6) || in6p->in6p_fport != sport) 861 continue; 862 } else { 863 if (IN6_IS_ADDR_V4MAPPED(&src6) && 864 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 865 continue; 866 } 867 868 udp6_sendup(m, off, (struct sockaddr *)src, 869 in6p->in6p_socket); 870 rcvcnt++; 871 872 /* 873 * Don't look for additional matches if this one does 874 * not have either the SO_REUSEPORT or SO_REUSEADDR 875 * socket options set. This heuristic avoids searching 876 * through all pcbs in the common case of a non-shared 877 * port. It assumes that an application will never 878 * clear these options after setting them. 879 */ 880 if ((in6p->in6p_socket->so_options & 881 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 882 break; 883 } 884 } else { 885 /* 886 * Locate pcb for datagram. 887 */ 888 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, 889 &dst6, dport, 0); 890 if (in6p == 0) { 891 ++udpstat.udps_pcbhashmiss; 892 in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0); 893 if (in6p == 0) 894 return rcvcnt; 895 } 896 897 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 898 rcvcnt++; 899 } 900 901 bad: 902 return rcvcnt; 903 } 904 #endif 905 906 #ifdef INET 907 /* 908 * Notify a udp user of an asynchronous error; 909 * just wake up so that he can collect error status. 910 */ 911 static void 912 udp_notify(struct inpcb *inp, int errno) 913 { 914 inp->inp_socket->so_error = errno; 915 sorwakeup(inp->inp_socket); 916 sowwakeup(inp->inp_socket); 917 } 918 919 void * 920 udp_ctlinput(int cmd, struct sockaddr *sa, void *v) 921 { 922 struct ip *ip = v; 923 struct udphdr *uh; 924 void (*notify)(struct inpcb *, int) = udp_notify; 925 int errno; 926 927 if (sa->sa_family != AF_INET 928 || sa->sa_len != sizeof(struct sockaddr_in)) 929 return NULL; 930 if ((unsigned)cmd >= PRC_NCMDS) 931 return NULL; 932 errno = inetctlerrmap[cmd]; 933 if (PRC_IS_REDIRECT(cmd)) 934 notify = in_rtchange, ip = 0; 935 else if (cmd == PRC_HOSTDEAD) 936 ip = 0; 937 else if (errno == 0) 938 return NULL; 939 if (ip) { 940 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 941 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 942 ip->ip_src, uh->uh_sport, errno, notify); 943 944 /* XXX mapped address case */ 945 } else 946 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 947 notify); 948 return NULL; 949 } 950 951 int 952 udp_ctloutput(op, so, level, optname, mp) 953 int op; 954 struct socket *so; 955 int level, optname; 956 struct mbuf **mp; 957 { 958 int s; 959 int error = 0; 960 struct mbuf *m; 961 struct inpcb *inp; 962 int family; 963 964 family = so->so_proto->pr_domain->dom_family; 965 966 s = splsoftnet(); 967 switch (family) { 968 #ifdef INET 969 case PF_INET: 970 if (level != IPPROTO_UDP) { 971 error = ip_ctloutput(op, so, level, optname, mp); 972 goto end; 973 } 974 break; 975 #endif 976 #ifdef INET6 977 case PF_INET6: 978 if (level != IPPROTO_UDP) { 979 error = ip6_ctloutput(op, so, level, optname, mp); 980 goto end; 981 } 982 break; 983 #endif 984 default: 985 error = EAFNOSUPPORT; 986 goto end; 987 break; 988 } 989 990 991 switch (op) { 992 case PRCO_SETOPT: 993 m = *mp; 994 inp = sotoinpcb(so); 995 996 switch (optname) { 997 case UDP_ENCAP: 998 if (m == NULL || m->m_len < sizeof (int)) { 999 error = EINVAL; 1000 goto end; 1001 } 1002 1003 switch(*mtod(m, int *)) { 1004 #ifdef IPSEC_NAT_T 1005 case 0: 1006 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1007 break; 1008 1009 case UDP_ENCAP_ESPINUDP: 1010 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1011 inp->inp_flags |= INP_ESPINUDP; 1012 break; 1013 1014 case UDP_ENCAP_ESPINUDP_NON_IKE: 1015 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1016 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1017 break; 1018 #endif 1019 default: 1020 error = EINVAL; 1021 goto end; 1022 break; 1023 } 1024 break; 1025 1026 default: 1027 error = ENOPROTOOPT; 1028 goto end; 1029 break; 1030 } 1031 break; 1032 1033 default: 1034 error = EINVAL; 1035 goto end; 1036 break; 1037 } 1038 1039 end: 1040 splx(s); 1041 return error; 1042 } 1043 1044 1045 int 1046 udp_output(struct mbuf *m, ...) 1047 { 1048 struct inpcb *inp; 1049 struct udpiphdr *ui; 1050 struct route *ro; 1051 int len = m->m_pkthdr.len; 1052 int error = 0; 1053 va_list ap; 1054 1055 MCLAIM(m, &udp_tx_mowner); 1056 va_start(ap, m); 1057 inp = va_arg(ap, struct inpcb *); 1058 va_end(ap); 1059 1060 /* 1061 * Calculate data length and get a mbuf 1062 * for UDP and IP headers. 1063 */ 1064 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1065 if (m == 0) { 1066 error = ENOBUFS; 1067 goto release; 1068 } 1069 1070 /* 1071 * Compute the packet length of the IP header, and 1072 * punt if the length looks bogus. 1073 */ 1074 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1075 error = EMSGSIZE; 1076 goto release; 1077 } 1078 1079 /* 1080 * Fill in mbuf with extended UDP header 1081 * and addresses and length put into network format. 1082 */ 1083 ui = mtod(m, struct udpiphdr *); 1084 ui->ui_pr = IPPROTO_UDP; 1085 ui->ui_src = inp->inp_laddr; 1086 ui->ui_dst = inp->inp_faddr; 1087 ui->ui_sport = inp->inp_lport; 1088 ui->ui_dport = inp->inp_fport; 1089 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1090 1091 ro = &inp->inp_route; 1092 1093 /* 1094 * Set up checksum and output datagram. 1095 */ 1096 if (udpcksum) { 1097 /* 1098 * XXX Cache pseudo-header checksum part for 1099 * XXX "connected" UDP sockets. 1100 */ 1101 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1102 ui->ui_dst.s_addr, htons((u_int16_t)len + 1103 sizeof(struct udphdr) + IPPROTO_UDP)); 1104 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1105 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1106 } else 1107 ui->ui_sum = 0; 1108 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1109 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1110 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1111 udpstat.udps_opackets++; 1112 1113 return (ip_output(m, inp->inp_options, ro, 1114 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1115 inp->inp_moptions, inp->inp_socket)); 1116 1117 release: 1118 m_freem(m); 1119 return (error); 1120 } 1121 1122 int udp_sendspace = 9216; /* really max datagram size */ 1123 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1124 /* 40 1K datagrams */ 1125 1126 /*ARGSUSED*/ 1127 int 1128 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1129 struct mbuf *control, struct proc *p) 1130 { 1131 struct inpcb *inp; 1132 int s; 1133 int error = 0; 1134 1135 if (req == PRU_CONTROL) 1136 return (in_control(so, (long)m, (caddr_t)nam, 1137 (struct ifnet *)control, p)); 1138 1139 if (req == PRU_PURGEIF) { 1140 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1141 in_purgeif((struct ifnet *)control); 1142 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1143 return (0); 1144 } 1145 1146 s = splsoftnet(); 1147 inp = sotoinpcb(so); 1148 #ifdef DIAGNOSTIC 1149 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1150 panic("udp_usrreq: unexpected control mbuf"); 1151 #endif 1152 if (inp == 0 && req != PRU_ATTACH) { 1153 error = EINVAL; 1154 goto release; 1155 } 1156 1157 /* 1158 * Note: need to block udp_input while changing 1159 * the udp pcb queue and/or pcb addresses. 1160 */ 1161 switch (req) { 1162 1163 case PRU_ATTACH: 1164 if (inp != 0) { 1165 error = EISCONN; 1166 break; 1167 } 1168 #ifdef MBUFTRACE 1169 so->so_mowner = &udp_mowner; 1170 so->so_rcv.sb_mowner = &udp_rx_mowner; 1171 so->so_snd.sb_mowner = &udp_tx_mowner; 1172 #endif 1173 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1174 error = soreserve(so, udp_sendspace, udp_recvspace); 1175 if (error) 1176 break; 1177 } 1178 error = in_pcballoc(so, &udbtable); 1179 if (error) 1180 break; 1181 inp = sotoinpcb(so); 1182 inp->inp_ip.ip_ttl = ip_defttl; 1183 break; 1184 1185 case PRU_DETACH: 1186 in_pcbdetach(inp); 1187 break; 1188 1189 case PRU_BIND: 1190 error = in_pcbbind(inp, nam, p); 1191 break; 1192 1193 case PRU_LISTEN: 1194 error = EOPNOTSUPP; 1195 break; 1196 1197 case PRU_CONNECT: 1198 error = in_pcbconnect(inp, nam); 1199 if (error) 1200 break; 1201 soisconnected(so); 1202 break; 1203 1204 case PRU_CONNECT2: 1205 error = EOPNOTSUPP; 1206 break; 1207 1208 case PRU_DISCONNECT: 1209 /*soisdisconnected(so);*/ 1210 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1211 in_pcbdisconnect(inp); 1212 inp->inp_laddr = zeroin_addr; /* XXX */ 1213 in_pcbstate(inp, INP_BOUND); /* XXX */ 1214 break; 1215 1216 case PRU_SHUTDOWN: 1217 socantsendmore(so); 1218 break; 1219 1220 case PRU_RCVD: 1221 error = EOPNOTSUPP; 1222 break; 1223 1224 case PRU_SEND: 1225 if (control && control->m_len) { 1226 m_freem(control); 1227 m_freem(m); 1228 error = EINVAL; 1229 break; 1230 } 1231 { 1232 struct in_addr laddr; /* XXX */ 1233 1234 if (nam) { 1235 laddr = inp->inp_laddr; /* XXX */ 1236 if ((so->so_state & SS_ISCONNECTED) != 0) { 1237 error = EISCONN; 1238 goto die; 1239 } 1240 error = in_pcbconnect(inp, nam); 1241 if (error) 1242 goto die; 1243 } else { 1244 if ((so->so_state & SS_ISCONNECTED) == 0) { 1245 error = ENOTCONN; 1246 goto die; 1247 } 1248 } 1249 error = udp_output(m, inp); 1250 m = NULL; 1251 if (nam) { 1252 in_pcbdisconnect(inp); 1253 inp->inp_laddr = laddr; /* XXX */ 1254 in_pcbstate(inp, INP_BOUND); /* XXX */ 1255 } 1256 die: 1257 if (m) 1258 m_freem(m); 1259 } 1260 break; 1261 1262 case PRU_SENSE: 1263 /* 1264 * stat: don't bother with a blocksize. 1265 */ 1266 splx(s); 1267 return (0); 1268 1269 case PRU_RCVOOB: 1270 error = EOPNOTSUPP; 1271 break; 1272 1273 case PRU_SENDOOB: 1274 m_freem(control); 1275 m_freem(m); 1276 error = EOPNOTSUPP; 1277 break; 1278 1279 case PRU_SOCKADDR: 1280 in_setsockaddr(inp, nam); 1281 break; 1282 1283 case PRU_PEERADDR: 1284 in_setpeeraddr(inp, nam); 1285 break; 1286 1287 default: 1288 panic("udp_usrreq"); 1289 } 1290 1291 release: 1292 splx(s); 1293 return (error); 1294 } 1295 1296 /* 1297 * Sysctl for udp variables. 1298 */ 1299 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1300 { 1301 1302 sysctl_createv(clog, 0, NULL, NULL, 1303 CTLFLAG_PERMANENT, 1304 CTLTYPE_NODE, "net", NULL, 1305 NULL, 0, NULL, 0, 1306 CTL_NET, CTL_EOL); 1307 sysctl_createv(clog, 0, NULL, NULL, 1308 CTLFLAG_PERMANENT, 1309 CTLTYPE_NODE, "inet", NULL, 1310 NULL, 0, NULL, 0, 1311 CTL_NET, PF_INET, CTL_EOL); 1312 sysctl_createv(clog, 0, NULL, NULL, 1313 CTLFLAG_PERMANENT, 1314 CTLTYPE_NODE, "udp", 1315 SYSCTL_DESCR("UDPv4 related settings"), 1316 NULL, 0, NULL, 0, 1317 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1318 1319 sysctl_createv(clog, 0, NULL, NULL, 1320 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1321 CTLTYPE_INT, "checksum", 1322 SYSCTL_DESCR("Compute UDP checksums"), 1323 NULL, 0, &udpcksum, 0, 1324 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1325 CTL_EOL); 1326 sysctl_createv(clog, 0, NULL, NULL, 1327 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1328 CTLTYPE_INT, "sendspace", 1329 SYSCTL_DESCR("Default UDP send buffer size"), 1330 NULL, 0, &udp_sendspace, 0, 1331 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1332 CTL_EOL); 1333 sysctl_createv(clog, 0, NULL, NULL, 1334 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1335 CTLTYPE_INT, "recvspace", 1336 SYSCTL_DESCR("Default UDP receive buffer size"), 1337 NULL, 0, &udp_recvspace, 0, 1338 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1339 CTL_EOL); 1340 sysctl_createv(clog, 0, NULL, NULL, 1341 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1342 CTLTYPE_INT, "do_loopback_cksum", 1343 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1344 NULL, 0, &udp_do_loopback_cksum, 0, 1345 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1346 CTL_EOL); 1347 sysctl_createv(clog, 0, NULL, NULL, 1348 CTLFLAG_PERMANENT, 1349 CTLTYPE_STRUCT, "pcblist", 1350 SYSCTL_DESCR("UDP protocol control block list"), 1351 sysctl_inpcblist, 0, &udbtable, 0, 1352 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1353 CTL_EOL); 1354 } 1355 #endif 1356 1357 #if (defined INET && defined IPSEC_NAT_T) 1358 /* 1359 * Returns: 1360 * 1 if the packet was processed 1361 * 0 if normal UDP processing should take place 1362 * -1 if an error occurent and m was freed 1363 */ 1364 static int 1365 udp4_espinudp(mp, off, src, so) 1366 struct mbuf **mp; 1367 int off; 1368 struct sockaddr *src; 1369 struct socket *so; 1370 { 1371 size_t len; 1372 caddr_t data; 1373 struct inpcb *inp; 1374 size_t skip = 0; 1375 size_t minlen; 1376 size_t iphdrlen; 1377 struct ip *ip; 1378 struct mbuf *n; 1379 struct m_tag *tag; 1380 struct udphdr *udphdr; 1381 u_int16_t sport, dport; 1382 struct mbuf *m = *mp; 1383 1384 /* 1385 * Collapse the mbuf chain if the first mbuf is too short 1386 * The longest case is: UDP + non ESP marker + ESP 1387 */ 1388 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1389 if (minlen > m->m_pkthdr.len) 1390 minlen = m->m_pkthdr.len; 1391 1392 if (m->m_len < minlen) { 1393 if ((*mp = m_pullup(m, minlen)) == NULL) { 1394 printf("udp4_espinudp: m_pullup failed\n"); 1395 return -1; 1396 } 1397 m = *mp; 1398 } 1399 1400 len = m->m_len - off; 1401 data = mtod(m, caddr_t) + off; 1402 inp = sotoinpcb(so); 1403 1404 /* Ignore keepalive packets */ 1405 if ((len == 1) && (data[0] == '\xff')) { 1406 return 1; 1407 } 1408 1409 /* 1410 * Check that the payload is long enough to hold 1411 * an ESP header and compute the length of encapsulation 1412 * header to remove 1413 */ 1414 if (inp->inp_flags & INP_ESPINUDP) { 1415 u_int32_t *st = (u_int32_t *)data; 1416 1417 if ((len <= sizeof(struct esp)) || (*st == 0)) 1418 return 0; /* Normal UDP processing */ 1419 1420 skip = sizeof(struct udphdr); 1421 } 1422 1423 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1424 u_int32_t *st = (u_int32_t *)data; 1425 1426 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1427 || ((st[0] | st[1]) != 0)) 1428 return 0; /* Normal UDP processing */ 1429 1430 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1431 } 1432 1433 /* 1434 * Get the UDP ports. They are handled in network 1435 * order everywhere in IPSEC_NAT_T code. 1436 */ 1437 udphdr = (struct udphdr *)(data - skip); 1438 sport = udphdr->uh_sport; 1439 dport = udphdr->uh_dport; 1440 1441 /* 1442 * Remove the UDP header (and possibly the non ESP marker) 1443 * IP header lendth is iphdrlen 1444 * Before: 1445 * <--- off ---> 1446 * +----+------+-----+ 1447 * | IP | UDP | ESP | 1448 * +----+------+-----+ 1449 * <-skip-> 1450 * After: 1451 * +----+-----+ 1452 * | IP | ESP | 1453 * +----+-----+ 1454 * <-skip-> 1455 */ 1456 iphdrlen = off - sizeof(struct udphdr); 1457 memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen); 1458 m_adj(m, skip); 1459 1460 ip = mtod(m, struct ip *); 1461 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1462 ip->ip_p = IPPROTO_ESP; 1463 1464 /* 1465 * Copy the mbuf to avoid multiple free, as both 1466 * esp4_input (which we call) and udp_input (which 1467 * called us) free the mbuf. 1468 */ 1469 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1470 printf("udp4_espinudp: m_dup failed\n"); 1471 return 0; 1472 } 1473 1474 /* 1475 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1476 * the source UDP port. This is required if we want 1477 * to select the right SPD for multiple hosts behind 1478 * same NAT 1479 */ 1480 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1481 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1482 printf("udp4_espinudp: m_tag_get failed\n"); 1483 m_freem(n); 1484 return 0; 1485 } 1486 ((u_int16_t *)(tag + 1))[0] = sport; 1487 ((u_int16_t *)(tag + 1))[1] = dport; 1488 m_tag_prepend(n, tag); 1489 1490 esp4_input(n, iphdrlen); 1491 1492 /* We handled it, it shoudln't be handled by UDP */ 1493 return 1; 1494 } 1495 #endif 1496
Indexes created Fri Sep 26 20:09:58 GMT 2025