1 /* $NetBSD: udp_usrreq.c,v 1.138 2005/04/29 13:06:23 manu 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 1.138 2005/04/29 13:06:23 manu 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 n = udp4_realinput(&src, &dst, m, iphlen); 386 #ifdef INET6 387 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 388 struct sockaddr_in6 src6, dst6; 389 390 bzero(&src6, sizeof(src6)); 391 src6.sin6_family = AF_INET6; 392 src6.sin6_len = sizeof(struct sockaddr_in6); 393 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 394 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 395 sizeof(ip->ip_src)); 396 src6.sin6_port = uh->uh_sport; 397 bzero(&dst6, sizeof(dst6)); 398 dst6.sin6_family = AF_INET6; 399 dst6.sin6_len = sizeof(struct sockaddr_in6); 400 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 401 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 402 sizeof(ip->ip_dst)); 403 dst6.sin6_port = uh->uh_dport; 404 405 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 406 } 407 #endif 408 409 if (n == 0) { 410 if (m->m_flags & (M_BCAST | M_MCAST)) { 411 udpstat.udps_noportbcast++; 412 goto bad; 413 } 414 udpstat.udps_noport++; 415 #ifdef IPKDB 416 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 417 m, iphlen + sizeof(struct udphdr), 418 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 419 /* 420 * It was a debugger connect packet, 421 * just drop it now 422 */ 423 goto bad; 424 } 425 #endif 426 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 427 m = NULL; 428 } 429 430 bad: 431 if (m) 432 m_freem(m); 433 return; 434 435 badcsum: 436 m_freem(m); 437 } 438 #endif 439 440 #ifdef INET6 441 static int 442 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 443 { 444 445 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 446 goto good; 447 } 448 if (uh->uh_sum == 0) { 449 udp6stat.udp6s_nosum++; 450 goto bad; 451 } 452 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 453 udp6stat.udp6s_badsum++; 454 goto bad; 455 } 456 457 good: 458 return 0; 459 bad: 460 return -1; 461 } 462 463 int 464 udp6_input(struct mbuf **mp, int *offp, int proto) 465 { 466 struct mbuf *m = *mp; 467 int off = *offp; 468 struct sockaddr_in6 src, dst; 469 struct ip6_hdr *ip6; 470 struct udphdr *uh; 471 u_int32_t plen, ulen; 472 473 ip6 = mtod(m, struct ip6_hdr *); 474 475 #if defined(NFAITH) && 0 < NFAITH 476 if (faithprefix(&ip6->ip6_dst)) { 477 /* send icmp6 host unreach? */ 478 m_freem(m); 479 return IPPROTO_DONE; 480 } 481 #endif 482 483 udp6stat.udp6s_ipackets++; 484 485 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 486 plen = m->m_pkthdr.len - off; 487 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 488 if (uh == NULL) { 489 ip6stat.ip6s_tooshort++; 490 return IPPROTO_DONE; 491 } 492 KASSERT(UDP_HDR_ALIGNED_P(uh)); 493 ulen = ntohs((u_short)uh->uh_ulen); 494 /* 495 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 496 * iff payload length > 0xffff. 497 */ 498 if (ulen == 0 && plen > 0xffff) 499 ulen = plen; 500 501 if (plen != ulen) { 502 udp6stat.udp6s_badlen++; 503 goto bad; 504 } 505 506 /* destination port of 0 is illegal, based on RFC768. */ 507 if (uh->uh_dport == 0) 508 goto bad; 509 510 /* Be proactive about malicious use of IPv4 mapped address */ 511 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 512 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 513 /* XXX stat */ 514 goto bad; 515 } 516 517 /* 518 * Checksum extended UDP header and data. Maybe skip checksum 519 * on loopback interfaces. 520 */ 521 if (udp6_input_checksum(m, uh, off, ulen)) 522 goto bad; 523 524 /* 525 * Construct source and dst sockaddrs. 526 * Note that ifindex (s6_addr16[1]) is already filled. 527 */ 528 bzero(&src, sizeof(src)); 529 src.sin6_family = AF_INET6; 530 src.sin6_len = sizeof(struct sockaddr_in6); 531 /* KAME hack: recover scopeid */ 532 (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif); 533 src.sin6_port = uh->uh_sport; 534 bzero(&dst, sizeof(dst)); 535 dst.sin6_family = AF_INET6; 536 dst.sin6_len = sizeof(struct sockaddr_in6); 537 /* KAME hack: recover scopeid */ 538 (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif); 539 dst.sin6_port = uh->uh_dport; 540 541 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 542 if (m->m_flags & M_MCAST) { 543 udp6stat.udp6s_noportmcast++; 544 goto bad; 545 } 546 udp6stat.udp6s_noport++; 547 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 548 m = NULL; 549 } 550 551 bad: 552 if (m) 553 m_freem(m); 554 return IPPROTO_DONE; 555 } 556 #endif 557 558 #ifdef INET 559 static void 560 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 561 struct sockaddr *src, struct socket *so) 562 { 563 struct mbuf *opts = NULL; 564 struct mbuf *n; 565 struct inpcb *inp = NULL; 566 567 if (!so) 568 return; 569 switch (so->so_proto->pr_domain->dom_family) { 570 case AF_INET: 571 inp = sotoinpcb(so); 572 break; 573 #ifdef INET6 574 case AF_INET6: 575 break; 576 #endif 577 default: 578 return; 579 } 580 581 #if defined(IPSEC) || defined(FAST_IPSEC) 582 /* check AH/ESP integrity. */ 583 if (so != NULL && ipsec4_in_reject_so(m, so)) { 584 ipsecstat.in_polvio++; 585 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 586 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 587 0, 0); 588 return; 589 } 590 #endif /*IPSEC*/ 591 592 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 593 if (inp && (inp->inp_flags & INP_CONTROLOPTS 594 || so->so_options & SO_TIMESTAMP)) { 595 struct ip *ip = mtod(n, struct ip *); 596 ip_savecontrol(inp, &opts, ip, n); 597 } 598 599 m_adj(n, off); 600 if (sbappendaddr(&so->so_rcv, src, n, 601 opts) == 0) { 602 m_freem(n); 603 if (opts) 604 m_freem(opts); 605 so->so_rcv.sb_overflowed++; 606 udpstat.udps_fullsock++; 607 } else 608 sorwakeup(so); 609 } 610 } 611 #endif 612 613 #ifdef INET6 614 static void 615 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 616 struct sockaddr *src, struct socket *so) 617 { 618 struct mbuf *opts = NULL; 619 struct mbuf *n; 620 struct in6pcb *in6p = NULL; 621 622 if (!so) 623 return; 624 if (so->so_proto->pr_domain->dom_family != AF_INET6) 625 return; 626 in6p = sotoin6pcb(so); 627 628 #if defined(IPSEC) || defined(FAST_IPSEC) 629 /* check AH/ESP integrity. */ 630 if (so != NULL && ipsec6_in_reject_so(m, so)) { 631 ipsec6stat.in_polvio++; 632 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 633 icmp6_error(n, ICMP6_DST_UNREACH, 634 ICMP6_DST_UNREACH_ADMIN, 0); 635 return; 636 } 637 #endif /*IPSEC*/ 638 639 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 640 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 641 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 642 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 643 ip6_savecontrol(in6p, &opts, ip6, n); 644 } 645 646 m_adj(n, off); 647 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 648 m_freem(n); 649 if (opts) 650 m_freem(opts); 651 so->so_rcv.sb_overflowed++; 652 udp6stat.udp6s_fullsock++; 653 } else 654 sorwakeup(so); 655 } 656 } 657 #endif 658 659 #ifdef INET 660 static int 661 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 662 struct mbuf *m, int off /* offset of udphdr */) 663 { 664 u_int16_t *sport, *dport; 665 int rcvcnt; 666 struct in_addr *src4, *dst4; 667 struct inpcb_hdr *inph; 668 struct inpcb *inp; 669 670 rcvcnt = 0; 671 off += sizeof(struct udphdr); /* now, offset of payload */ 672 673 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 674 goto bad; 675 676 src4 = &src->sin_addr; 677 sport = &src->sin_port; 678 dst4 = &dst->sin_addr; 679 dport = &dst->sin_port; 680 681 if (IN_MULTICAST(dst4->s_addr) || 682 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 683 /* 684 * Deliver a multicast or broadcast datagram to *all* sockets 685 * for which the local and remote addresses and ports match 686 * those of the incoming datagram. This allows more than 687 * one process to receive multi/broadcasts on the same port. 688 * (This really ought to be done for unicast datagrams as 689 * well, but that would cause problems with existing 690 * applications that open both address-specific sockets and 691 * a wildcard socket listening to the same port -- they would 692 * end up receiving duplicates of every unicast datagram. 693 * Those applications open the multiple sockets to overcome an 694 * inadequacy of the UDP socket interface, but for backwards 695 * compatibility we avoid the problem here rather than 696 * fixing the interface. Maybe 4.5BSD will remedy this?) 697 */ 698 699 /* 700 * KAME note: traditionally we dropped udpiphdr from mbuf here. 701 * we need udpiphdr for IPsec processing so we do that later. 702 */ 703 /* 704 * Locate pcb(s) for datagram. 705 */ 706 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 707 inp = (struct inpcb *)inph; 708 if (inp->inp_af != AF_INET) 709 continue; 710 711 if (inp->inp_lport != *dport) 712 continue; 713 if (!in_nullhost(inp->inp_laddr)) { 714 if (!in_hosteq(inp->inp_laddr, *dst4)) 715 continue; 716 } 717 if (!in_nullhost(inp->inp_faddr)) { 718 if (!in_hosteq(inp->inp_faddr, *src4) || 719 inp->inp_fport != *sport) 720 continue; 721 } 722 723 udp4_sendup(m, off, (struct sockaddr *)src, 724 inp->inp_socket); 725 rcvcnt++; 726 727 /* 728 * Don't look for additional matches if this one does 729 * not have either the SO_REUSEPORT or SO_REUSEADDR 730 * socket options set. This heuristic avoids searching 731 * through all pcbs in the common case of a non-shared 732 * port. It assumes that an application will never 733 * clear these options after setting them. 734 */ 735 if ((inp->inp_socket->so_options & 736 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 737 break; 738 } 739 } else { 740 /* 741 * Locate pcb for datagram. 742 */ 743 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 744 if (inp == 0) { 745 ++udpstat.udps_pcbhashmiss; 746 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 747 if (inp == 0) 748 return rcvcnt; 749 } 750 751 #ifdef IPSEC_NAT_T 752 /* Handle ESP over UDP */ 753 if (inp->inp_flags & INP_ESPINUDP_ALL) { 754 struct sockaddr *sa = (struct sockaddr *)src; 755 756 if (udp4_espinudp(m, off, sa, inp->inp_socket) != 0) { 757 rcvcnt++; 758 goto bad; 759 } 760 761 /* Normal UDP processing will take place */ 762 } 763 #endif 764 765 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 766 rcvcnt++; 767 } 768 769 bad: 770 return rcvcnt; 771 } 772 #endif 773 774 #ifdef INET6 775 static int 776 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 777 struct mbuf *m, int off) 778 { 779 u_int16_t sport, dport; 780 int rcvcnt; 781 struct in6_addr src6, dst6; 782 const struct in_addr *dst4; 783 struct inpcb_hdr *inph; 784 struct in6pcb *in6p; 785 786 rcvcnt = 0; 787 off += sizeof(struct udphdr); /* now, offset of payload */ 788 789 if (af != AF_INET && af != AF_INET6) 790 goto bad; 791 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 792 goto bad; 793 794 in6_embedscope(&src6, src, NULL, NULL); 795 sport = src->sin6_port; 796 in6_embedscope(&dst6, dst, NULL, NULL); 797 dport = dst->sin6_port; 798 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 799 800 if (IN6_IS_ADDR_MULTICAST(&dst6) || 801 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 802 /* 803 * Deliver a multicast or broadcast datagram to *all* sockets 804 * for which the local and remote addresses and ports match 805 * those of the incoming datagram. This allows more than 806 * one process to receive multi/broadcasts on the same port. 807 * (This really ought to be done for unicast datagrams as 808 * well, but that would cause problems with existing 809 * applications that open both address-specific sockets and 810 * a wildcard socket listening to the same port -- they would 811 * end up receiving duplicates of every unicast datagram. 812 * Those applications open the multiple sockets to overcome an 813 * inadequacy of the UDP socket interface, but for backwards 814 * compatibility we avoid the problem here rather than 815 * fixing the interface. Maybe 4.5BSD will remedy this?) 816 */ 817 818 /* 819 * KAME note: traditionally we dropped udpiphdr from mbuf here. 820 * we need udpiphdr for IPsec processing so we do that later. 821 */ 822 /* 823 * Locate pcb(s) for datagram. 824 */ 825 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 826 in6p = (struct in6pcb *)inph; 827 if (in6p->in6p_af != AF_INET6) 828 continue; 829 830 if (in6p->in6p_lport != dport) 831 continue; 832 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 833 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6)) 834 continue; 835 } else { 836 if (IN6_IS_ADDR_V4MAPPED(&dst6) && 837 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 838 continue; 839 } 840 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 841 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 842 &src6) || in6p->in6p_fport != sport) 843 continue; 844 } else { 845 if (IN6_IS_ADDR_V4MAPPED(&src6) && 846 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 847 continue; 848 } 849 850 udp6_sendup(m, off, (struct sockaddr *)src, 851 in6p->in6p_socket); 852 rcvcnt++; 853 854 /* 855 * Don't look for additional matches if this one does 856 * not have either the SO_REUSEPORT or SO_REUSEADDR 857 * socket options set. This heuristic avoids searching 858 * through all pcbs in the common case of a non-shared 859 * port. It assumes that an application will never 860 * clear these options after setting them. 861 */ 862 if ((in6p->in6p_socket->so_options & 863 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 864 break; 865 } 866 } else { 867 /* 868 * Locate pcb for datagram. 869 */ 870 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, 871 &dst6, dport, 0); 872 if (in6p == 0) { 873 ++udpstat.udps_pcbhashmiss; 874 in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0); 875 if (in6p == 0) 876 return rcvcnt; 877 } 878 879 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 880 rcvcnt++; 881 } 882 883 bad: 884 return rcvcnt; 885 } 886 #endif 887 888 #ifdef INET 889 /* 890 * Notify a udp user of an asynchronous error; 891 * just wake up so that he can collect error status. 892 */ 893 static void 894 udp_notify(struct inpcb *inp, int errno) 895 { 896 inp->inp_socket->so_error = errno; 897 sorwakeup(inp->inp_socket); 898 sowwakeup(inp->inp_socket); 899 } 900 901 void * 902 udp_ctlinput(int cmd, struct sockaddr *sa, void *v) 903 { 904 struct ip *ip = v; 905 struct udphdr *uh; 906 void (*notify)(struct inpcb *, int) = udp_notify; 907 int errno; 908 909 if (sa->sa_family != AF_INET 910 || sa->sa_len != sizeof(struct sockaddr_in)) 911 return NULL; 912 if ((unsigned)cmd >= PRC_NCMDS) 913 return NULL; 914 errno = inetctlerrmap[cmd]; 915 if (PRC_IS_REDIRECT(cmd)) 916 notify = in_rtchange, ip = 0; 917 else if (cmd == PRC_HOSTDEAD) 918 ip = 0; 919 else if (errno == 0) 920 return NULL; 921 if (ip) { 922 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 923 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 924 ip->ip_src, uh->uh_sport, errno, notify); 925 926 /* XXX mapped address case */ 927 } else 928 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 929 notify); 930 return NULL; 931 } 932 933 int 934 udp_ctloutput(op, so, level, optname, mp) 935 int op; 936 struct socket *so; 937 int level, optname; 938 struct mbuf **mp; 939 { 940 int s; 941 int error = 0; 942 struct mbuf *m; 943 struct inpcb *inp; 944 int family; 945 946 family = so->so_proto->pr_domain->dom_family; 947 948 s = splsoftnet(); 949 switch (family) { 950 #ifdef INET 951 case PF_INET: 952 if (level != IPPROTO_UDP) { 953 error = ip_ctloutput(op, so, level, optname, mp); 954 goto end; 955 } 956 break; 957 #endif 958 #ifdef INET6 959 case PF_INET6: 960 if (level != IPPROTO_UDP) { 961 error = ip6_ctloutput(op, so, level, optname, mp); 962 goto end; 963 } 964 break; 965 #endif 966 default: 967 error = EAFNOSUPPORT; 968 goto end; 969 break; 970 } 971 972 973 switch (op) { 974 case PRCO_SETOPT: 975 m = *mp; 976 inp = sotoinpcb(so); 977 978 switch (optname) { 979 case UDP_ENCAP: 980 if (m == NULL || m->m_len < sizeof (int)) { 981 error = EINVAL; 982 goto end; 983 } 984 985 switch(*mtod(m, int *)) { 986 #ifdef IPSEC_NAT_T 987 case 0: 988 inp->inp_flags &= ~INP_ESPINUDP_ALL; 989 break; 990 991 case UDP_ENCAP_ESPINUDP: 992 inp->inp_flags &= ~INP_ESPINUDP_ALL; 993 inp->inp_flags |= INP_ESPINUDP; 994 break; 995 996 case UDP_ENCAP_ESPINUDP_NON_IKE: 997 inp->inp_flags &= ~INP_ESPINUDP_ALL; 998 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 999 break; 1000 #endif 1001 default: 1002 error = EINVAL; 1003 goto end; 1004 break; 1005 } 1006 break; 1007 1008 default: 1009 error = ENOPROTOOPT; 1010 goto end; 1011 break; 1012 } 1013 break; 1014 1015 default: 1016 error = EINVAL; 1017 goto end; 1018 break; 1019 } 1020 1021 end: 1022 splx(s); 1023 return error; 1024 } 1025 1026 1027 int 1028 udp_output(struct mbuf *m, ...) 1029 { 1030 struct inpcb *inp; 1031 struct udpiphdr *ui; 1032 struct route *ro; 1033 int len = m->m_pkthdr.len; 1034 int error = 0; 1035 va_list ap; 1036 1037 MCLAIM(m, &udp_tx_mowner); 1038 va_start(ap, m); 1039 inp = va_arg(ap, struct inpcb *); 1040 va_end(ap); 1041 1042 /* 1043 * Calculate data length and get a mbuf 1044 * for UDP and IP headers. 1045 */ 1046 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1047 if (m == 0) { 1048 error = ENOBUFS; 1049 goto release; 1050 } 1051 1052 /* 1053 * Compute the packet length of the IP header, and 1054 * punt if the length looks bogus. 1055 */ 1056 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1057 error = EMSGSIZE; 1058 goto release; 1059 } 1060 1061 /* 1062 * Fill in mbuf with extended UDP header 1063 * and addresses and length put into network format. 1064 */ 1065 ui = mtod(m, struct udpiphdr *); 1066 ui->ui_pr = IPPROTO_UDP; 1067 ui->ui_src = inp->inp_laddr; 1068 ui->ui_dst = inp->inp_faddr; 1069 ui->ui_sport = inp->inp_lport; 1070 ui->ui_dport = inp->inp_fport; 1071 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1072 1073 ro = &inp->inp_route; 1074 1075 /* 1076 * Set up checksum and output datagram. 1077 */ 1078 if (udpcksum) { 1079 /* 1080 * XXX Cache pseudo-header checksum part for 1081 * XXX "connected" UDP sockets. 1082 */ 1083 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1084 ui->ui_dst.s_addr, htons((u_int16_t)len + 1085 sizeof(struct udphdr) + IPPROTO_UDP)); 1086 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1087 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1088 } else 1089 ui->ui_sum = 0; 1090 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1091 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1092 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1093 udpstat.udps_opackets++; 1094 1095 return (ip_output(m, inp->inp_options, ro, 1096 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1097 inp->inp_moptions, inp->inp_socket)); 1098 1099 release: 1100 m_freem(m); 1101 return (error); 1102 } 1103 1104 int udp_sendspace = 9216; /* really max datagram size */ 1105 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1106 /* 40 1K datagrams */ 1107 1108 /*ARGSUSED*/ 1109 int 1110 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1111 struct mbuf *control, struct proc *p) 1112 { 1113 struct inpcb *inp; 1114 int s; 1115 int error = 0; 1116 1117 if (req == PRU_CONTROL) 1118 return (in_control(so, (long)m, (caddr_t)nam, 1119 (struct ifnet *)control, p)); 1120 1121 if (req == PRU_PURGEIF) { 1122 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1123 in_purgeif((struct ifnet *)control); 1124 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1125 return (0); 1126 } 1127 1128 s = splsoftnet(); 1129 inp = sotoinpcb(so); 1130 #ifdef DIAGNOSTIC 1131 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1132 panic("udp_usrreq: unexpected control mbuf"); 1133 #endif 1134 if (inp == 0 && req != PRU_ATTACH) { 1135 error = EINVAL; 1136 goto release; 1137 } 1138 1139 /* 1140 * Note: need to block udp_input while changing 1141 * the udp pcb queue and/or pcb addresses. 1142 */ 1143 switch (req) { 1144 1145 case PRU_ATTACH: 1146 if (inp != 0) { 1147 error = EISCONN; 1148 break; 1149 } 1150 #ifdef MBUFTRACE 1151 so->so_mowner = &udp_mowner; 1152 so->so_rcv.sb_mowner = &udp_rx_mowner; 1153 so->so_snd.sb_mowner = &udp_tx_mowner; 1154 #endif 1155 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1156 error = soreserve(so, udp_sendspace, udp_recvspace); 1157 if (error) 1158 break; 1159 } 1160 error = in_pcballoc(so, &udbtable); 1161 if (error) 1162 break; 1163 inp = sotoinpcb(so); 1164 inp->inp_ip.ip_ttl = ip_defttl; 1165 break; 1166 1167 case PRU_DETACH: 1168 in_pcbdetach(inp); 1169 break; 1170 1171 case PRU_BIND: 1172 error = in_pcbbind(inp, nam, p); 1173 break; 1174 1175 case PRU_LISTEN: 1176 error = EOPNOTSUPP; 1177 break; 1178 1179 case PRU_CONNECT: 1180 error = in_pcbconnect(inp, nam); 1181 if (error) 1182 break; 1183 soisconnected(so); 1184 break; 1185 1186 case PRU_CONNECT2: 1187 error = EOPNOTSUPP; 1188 break; 1189 1190 case PRU_DISCONNECT: 1191 /*soisdisconnected(so);*/ 1192 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1193 in_pcbdisconnect(inp); 1194 inp->inp_laddr = zeroin_addr; /* XXX */ 1195 in_pcbstate(inp, INP_BOUND); /* XXX */ 1196 break; 1197 1198 case PRU_SHUTDOWN: 1199 socantsendmore(so); 1200 break; 1201 1202 case PRU_RCVD: 1203 error = EOPNOTSUPP; 1204 break; 1205 1206 case PRU_SEND: 1207 if (control && control->m_len) { 1208 m_freem(control); 1209 m_freem(m); 1210 error = EINVAL; 1211 break; 1212 } 1213 { 1214 struct in_addr laddr; /* XXX */ 1215 1216 if (nam) { 1217 laddr = inp->inp_laddr; /* XXX */ 1218 if ((so->so_state & SS_ISCONNECTED) != 0) { 1219 error = EISCONN; 1220 goto die; 1221 } 1222 error = in_pcbconnect(inp, nam); 1223 if (error) 1224 goto die; 1225 } else { 1226 if ((so->so_state & SS_ISCONNECTED) == 0) { 1227 error = ENOTCONN; 1228 goto die; 1229 } 1230 } 1231 error = udp_output(m, inp); 1232 m = NULL; 1233 if (nam) { 1234 in_pcbdisconnect(inp); 1235 inp->inp_laddr = laddr; /* XXX */ 1236 in_pcbstate(inp, INP_BOUND); /* XXX */ 1237 } 1238 die: 1239 if (m) 1240 m_freem(m); 1241 } 1242 break; 1243 1244 case PRU_SENSE: 1245 /* 1246 * stat: don't bother with a blocksize. 1247 */ 1248 splx(s); 1249 return (0); 1250 1251 case PRU_RCVOOB: 1252 error = EOPNOTSUPP; 1253 break; 1254 1255 case PRU_SENDOOB: 1256 m_freem(control); 1257 m_freem(m); 1258 error = EOPNOTSUPP; 1259 break; 1260 1261 case PRU_SOCKADDR: 1262 in_setsockaddr(inp, nam); 1263 break; 1264 1265 case PRU_PEERADDR: 1266 in_setpeeraddr(inp, nam); 1267 break; 1268 1269 default: 1270 panic("udp_usrreq"); 1271 } 1272 1273 release: 1274 splx(s); 1275 return (error); 1276 } 1277 1278 /* 1279 * Sysctl for udp variables. 1280 */ 1281 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1282 { 1283 1284 sysctl_createv(clog, 0, NULL, NULL, 1285 CTLFLAG_PERMANENT, 1286 CTLTYPE_NODE, "net", NULL, 1287 NULL, 0, NULL, 0, 1288 CTL_NET, CTL_EOL); 1289 sysctl_createv(clog, 0, NULL, NULL, 1290 CTLFLAG_PERMANENT, 1291 CTLTYPE_NODE, "inet", NULL, 1292 NULL, 0, NULL, 0, 1293 CTL_NET, PF_INET, CTL_EOL); 1294 sysctl_createv(clog, 0, NULL, NULL, 1295 CTLFLAG_PERMANENT, 1296 CTLTYPE_NODE, "udp", 1297 SYSCTL_DESCR("UDPv4 related settings"), 1298 NULL, 0, NULL, 0, 1299 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1300 1301 sysctl_createv(clog, 0, NULL, NULL, 1302 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1303 CTLTYPE_INT, "checksum", 1304 SYSCTL_DESCR("Compute UDP checksums"), 1305 NULL, 0, &udpcksum, 0, 1306 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1307 CTL_EOL); 1308 sysctl_createv(clog, 0, NULL, NULL, 1309 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1310 CTLTYPE_INT, "sendspace", 1311 SYSCTL_DESCR("Default UDP send buffer size"), 1312 NULL, 0, &udp_sendspace, 0, 1313 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1314 CTL_EOL); 1315 sysctl_createv(clog, 0, NULL, NULL, 1316 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1317 CTLTYPE_INT, "recvspace", 1318 SYSCTL_DESCR("Default UDP receive buffer size"), 1319 NULL, 0, &udp_recvspace, 0, 1320 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1321 CTL_EOL); 1322 sysctl_createv(clog, 0, NULL, NULL, 1323 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1324 CTLTYPE_INT, "do_loopback_cksum", 1325 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1326 NULL, 0, &udp_do_loopback_cksum, 0, 1327 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1328 CTL_EOL); 1329 sysctl_createv(clog, 0, NULL, NULL, 1330 CTLFLAG_PERMANENT, 1331 CTLTYPE_STRUCT, "pcblist", 1332 SYSCTL_DESCR("UDP protocol control block list"), 1333 sysctl_inpcblist, 0, &udbtable, 0, 1334 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1335 CTL_EOL); 1336 } 1337 #endif 1338 1339 #if (defined INET && defined IPSEC_NAT_T) 1340 /* 1341 * Returns: 1342 * 1 if the packet was processed 1343 * 0 if normal UDP processing should take place 1344 */ 1345 static int 1346 udp4_espinudp(m, off, src, so) 1347 struct mbuf *m; 1348 int off; 1349 struct sockaddr *src; 1350 struct socket *so; 1351 { 1352 size_t len; 1353 caddr_t data; 1354 struct inpcb *inp; 1355 size_t skip = 0; 1356 size_t minlen; 1357 size_t iphdrlen; 1358 struct ip *ip; 1359 struct mbuf *n; 1360 struct m_tag *tag; 1361 struct udphdr *udphdr; 1362 u_int16_t sport, dport; 1363 1364 /* 1365 * Collapse the mbuf chain if the first mbuf is too short 1366 * The longest case is: UDP + non ESP marker + ESP 1367 */ 1368 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1369 if (minlen > m->m_pkthdr.len) 1370 minlen = m->m_pkthdr.len; 1371 1372 if (m->m_len < minlen) { 1373 if ((m = m_pullup(m, minlen)) == NULL) { 1374 printf("udp4_espinudp: m_pullup failed\n"); 1375 return 0; 1376 } 1377 } 1378 1379 len = m->m_len - off; 1380 data = mtod(m, caddr_t) + off; 1381 inp = sotoinpcb(so); 1382 1383 /* Ignore keepalive packets */ 1384 if ((len == 1) && (data[0] == '\xff')) { 1385 return 1; 1386 } 1387 1388 /* 1389 * Check that the payload is long enough to hold 1390 * an ESP header and compute the length of encapsulation 1391 * header to remove 1392 */ 1393 if (inp->inp_flags & INP_ESPINUDP) { 1394 u_int32_t *st = (u_int32_t *)data; 1395 1396 if ((len <= sizeof(struct esp)) || (*st == 0)) 1397 return 0; /* Normal UDP processing */ 1398 1399 skip = sizeof(struct udphdr); 1400 } 1401 1402 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1403 u_int64_t *st = (u_int64_t *)data; 1404 1405 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1406 || (*st != 0)) 1407 return 0; /* Normal UDP processing */ 1408 1409 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1410 } 1411 1412 /* 1413 * Get the UDP ports. They are handled in network 1414 * order everywhere in IPSEC_NAT_T code. 1415 */ 1416 udphdr = (struct udphdr *)(data - skip); 1417 sport = udphdr->uh_sport; 1418 dport = udphdr->uh_dport; 1419 1420 /* 1421 * Remove the UDP header (and possibly the non ESP marker) 1422 * IP header lendth is iphdrlen 1423 * Before: 1424 * <--- off ---> 1425 * +----+------+-----+ 1426 * | IP | UDP | ESP | 1427 * +----+------+-----+ 1428 * <-skip-> 1429 * After: 1430 * +----+-----+ 1431 * | IP | ESP | 1432 * +----+-----+ 1433 * <-skip-> 1434 */ 1435 iphdrlen = off - sizeof(struct udphdr); 1436 memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen); 1437 m_adj(m, skip); 1438 1439 ip = mtod(m, struct ip *); 1440 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1441 ip->ip_p = IPPROTO_ESP; 1442 1443 /* 1444 * Copy the mbuf to avoid multiple free, as both 1445 * esp4_input (which we call) and udp_input (which 1446 * called us) free the mbuf. 1447 */ 1448 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1449 printf("udp4_espinudp: m_dup failed\n"); 1450 return 0; 1451 } 1452 1453 /* 1454 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1455 * the source UDP port. This is required if we want 1456 * to select the right SPD for multiple hosts behind 1457 * same NAT 1458 */ 1459 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1460 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1461 printf("udp4_espinudp: m_tag_get failed\n"); 1462 m_freem(n); 1463 return 0; 1464 } 1465 ((u_int16_t *)(tag + 1))[0] = sport; 1466 ((u_int16_t *)(tag + 1))[1] = dport; 1467 m_tag_prepend(n, tag); 1468 1469 esp4_input(n, iphdrlen); 1470 1471 /* We handled it, it shoudln't be handled by UDP */ 1472 return 1; 1473 } 1474 #endif 1475