1 /* $NetBSD: udp_usrreq.c,v 1.148 2006/07/23 22:06:13 ad 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 1.148 2006/07/23 22:06:13 ad 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 #include <netinet6/scope6_var.h> 105 #endif 106 107 #ifndef INET6 108 /* always need ip6.h for IP6_EXTHDR_GET */ 109 #include <netinet/ip6.h> 110 #endif 111 112 #include "faith.h" 113 #if defined(NFAITH) && NFAITH > 0 114 #include <net/if_faith.h> 115 #endif 116 117 #include <machine/stdarg.h> 118 119 #ifdef FAST_IPSEC 120 #include <netipsec/ipsec.h> 121 #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */ 122 #include <netipsec/esp.h> 123 #ifdef INET6 124 #include <netipsec/ipsec6.h> 125 #endif 126 #endif /* FAST_IPSEC*/ 127 128 #ifdef IPSEC 129 #include <netinet6/ipsec.h> 130 #include <netinet6/esp.h> 131 #include <netkey/key.h> 132 #endif /*IPSEC*/ 133 134 #ifdef IPKDB 135 #include <ipkdb/ipkdb.h> 136 #endif 137 138 /* 139 * UDP protocol implementation. 140 * Per RFC 768, August, 1980. 141 */ 142 #ifndef COMPAT_42 143 int udpcksum = 1; 144 #else 145 int udpcksum = 0; /* XXX */ 146 #endif 147 int udp_do_loopback_cksum = 0; 148 149 struct inpcbtable udbtable; 150 struct udpstat udpstat; 151 152 #ifdef INET 153 #ifdef IPSEC_NAT_T 154 static int udp4_espinudp (struct mbuf **, int, struct sockaddr *, 155 struct socket *); 156 #endif 157 static void udp4_sendup (struct mbuf *, int, struct sockaddr *, 158 struct socket *); 159 static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, 160 struct mbuf **, int); 161 static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); 162 #endif 163 #ifdef INET6 164 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 165 struct socket *); 166 static int udp6_realinput (int, struct sockaddr_in6 *, 167 struct sockaddr_in6 *, struct mbuf *, int); 168 static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int); 169 #endif 170 #ifdef INET 171 static void udp_notify (struct inpcb *, int); 172 #endif 173 174 #ifndef UDBHASHSIZE 175 #define UDBHASHSIZE 128 176 #endif 177 int udbhashsize = UDBHASHSIZE; 178 179 #ifdef MBUFTRACE 180 struct mowner udp_mowner = { "udp" }; 181 struct mowner udp_rx_mowner = { "udp", "rx" }; 182 struct mowner udp_tx_mowner = { "udp", "tx" }; 183 #endif 184 185 #ifdef UDP_CSUM_COUNTERS 186 #include <sys/device.h> 187 188 #if defined(INET) 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 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 199 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 200 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 201 EVCNT_ATTACH_STATIC(udp_swcsum); 202 #endif /* defined(INET) */ 203 204 #if defined(INET6) 205 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 206 NULL, "udp6", "hwcsum bad"); 207 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 208 NULL, "udp6", "hwcsum ok"); 209 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 210 NULL, "udp6", "hwcsum data"); 211 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 212 NULL, "udp6", "swcsum"); 213 214 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 215 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 216 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 217 EVCNT_ATTACH_STATIC(udp6_swcsum); 218 #endif /* defined(INET6) */ 219 220 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 221 222 #else 223 224 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 225 226 #endif /* UDP_CSUM_COUNTERS */ 227 228 void 229 udp_init(void) 230 { 231 232 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 233 234 MOWNER_ATTACH(&udp_tx_mowner); 235 MOWNER_ATTACH(&udp_rx_mowner); 236 MOWNER_ATTACH(&udp_mowner); 237 } 238 239 /* 240 * Checksum extended UDP header and data. 241 */ 242 243 int 244 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 245 int iphlen, int len) 246 { 247 248 switch (af) { 249 #ifdef INET 250 case AF_INET: 251 return udp4_input_checksum(m, uh, iphlen, len); 252 #endif 253 #ifdef INET6 254 case AF_INET6: 255 return udp6_input_checksum(m, uh, iphlen, len); 256 #endif 257 } 258 #ifdef DIAGNOSTIC 259 panic("udp_input_checksum: unknown af %d", af); 260 #endif 261 /* NOTREACHED */ 262 return -1; 263 } 264 265 #ifdef INET 266 267 /* 268 * Checksum extended UDP header and data. 269 */ 270 271 static int 272 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 273 int iphlen, int len) 274 { 275 276 /* 277 * XXX it's better to record and check if this mbuf is 278 * already checked. 279 */ 280 281 if (uh->uh_sum == 0) 282 return 0; 283 284 switch (m->m_pkthdr.csum_flags & 285 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 286 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 287 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 288 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 289 goto badcsum; 290 291 case M_CSUM_UDPv4|M_CSUM_DATA: { 292 u_int32_t hw_csum = m->m_pkthdr.csum_data; 293 294 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 295 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 296 const struct ip *ip = 297 mtod(m, const struct ip *); 298 299 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 300 ip->ip_dst.s_addr, 301 htons(hw_csum + len + IPPROTO_UDP)); 302 } 303 if ((hw_csum ^ 0xffff) != 0) 304 goto badcsum; 305 break; 306 } 307 308 case M_CSUM_UDPv4: 309 /* Checksum was okay. */ 310 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 311 break; 312 313 default: 314 /* 315 * Need to compute it ourselves. Maybe skip checksum 316 * on loopback interfaces. 317 */ 318 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 319 IFF_LOOPBACK) || 320 udp_do_loopback_cksum)) { 321 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 322 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 323 goto badcsum; 324 } 325 break; 326 } 327 328 return 0; 329 330 badcsum: 331 udpstat.udps_badsum++; 332 return -1; 333 } 334 335 void 336 udp_input(struct mbuf *m, ...) 337 { 338 va_list ap; 339 struct sockaddr_in src, dst; 340 struct ip *ip; 341 struct udphdr *uh; 342 int iphlen; 343 int len; 344 int n; 345 u_int16_t ip_len; 346 347 va_start(ap, m); 348 iphlen = va_arg(ap, int); 349 (void)va_arg(ap, int); /* ignore value, advance ap */ 350 va_end(ap); 351 352 MCLAIM(m, &udp_rx_mowner); 353 udpstat.udps_ipackets++; 354 355 /* 356 * Get IP and UDP header together in first mbuf. 357 */ 358 ip = mtod(m, struct ip *); 359 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 360 if (uh == NULL) { 361 udpstat.udps_hdrops++; 362 return; 363 } 364 KASSERT(UDP_HDR_ALIGNED_P(uh)); 365 366 /* destination port of 0 is illegal, based on RFC768. */ 367 if (uh->uh_dport == 0) 368 goto bad; 369 370 /* 371 * Make mbuf data length reflect UDP length. 372 * If not enough data to reflect UDP length, drop. 373 */ 374 ip_len = ntohs(ip->ip_len); 375 len = ntohs((u_int16_t)uh->uh_ulen); 376 if (ip_len != iphlen + len) { 377 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 378 udpstat.udps_badlen++; 379 goto bad; 380 } 381 m_adj(m, iphlen + len - ip_len); 382 } 383 384 /* 385 * Checksum extended UDP header and data. 386 */ 387 if (udp4_input_checksum(m, uh, iphlen, len)) 388 goto badcsum; 389 390 /* construct source and dst sockaddrs. */ 391 bzero(&src, sizeof(src)); 392 src.sin_family = AF_INET; 393 src.sin_len = sizeof(struct sockaddr_in); 394 bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr)); 395 src.sin_port = uh->uh_sport; 396 bzero(&dst, sizeof(dst)); 397 dst.sin_family = AF_INET; 398 dst.sin_len = sizeof(struct sockaddr_in); 399 bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr)); 400 dst.sin_port = uh->uh_dport; 401 402 if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { 403 udpstat.udps_hdrops++; 404 return; 405 } 406 #ifdef INET6 407 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 408 struct sockaddr_in6 src6, dst6; 409 410 bzero(&src6, sizeof(src6)); 411 src6.sin6_family = AF_INET6; 412 src6.sin6_len = sizeof(struct sockaddr_in6); 413 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 414 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 415 sizeof(ip->ip_src)); 416 src6.sin6_port = uh->uh_sport; 417 bzero(&dst6, sizeof(dst6)); 418 dst6.sin6_family = AF_INET6; 419 dst6.sin6_len = sizeof(struct sockaddr_in6); 420 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 421 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 422 sizeof(ip->ip_dst)); 423 dst6.sin6_port = uh->uh_dport; 424 425 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 426 } 427 #endif 428 429 if (n == 0) { 430 if (m->m_flags & (M_BCAST | M_MCAST)) { 431 udpstat.udps_noportbcast++; 432 goto bad; 433 } 434 udpstat.udps_noport++; 435 #ifdef IPKDB 436 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 437 m, iphlen + sizeof(struct udphdr), 438 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 439 /* 440 * It was a debugger connect packet, 441 * just drop it now 442 */ 443 goto bad; 444 } 445 #endif 446 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 447 m = NULL; 448 } 449 450 bad: 451 if (m) 452 m_freem(m); 453 return; 454 455 badcsum: 456 m_freem(m); 457 } 458 #endif 459 460 #ifdef INET6 461 static int 462 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 463 { 464 465 /* 466 * XXX it's better to record and check if this mbuf is 467 * already checked. 468 */ 469 470 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 471 goto good; 472 } 473 if (uh->uh_sum == 0) { 474 udp6stat.udp6s_nosum++; 475 goto bad; 476 } 477 478 switch (m->m_pkthdr.csum_flags & 479 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 480 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 481 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 482 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 483 udp6stat.udp6s_badsum++; 484 goto bad; 485 486 #if 0 /* notyet */ 487 case M_CSUM_UDPv6|M_CSUM_DATA: 488 #endif 489 490 case M_CSUM_UDPv6: 491 /* Checksum was okay. */ 492 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 493 break; 494 495 default: 496 /* 497 * Need to compute it ourselves. Maybe skip checksum 498 * on loopback interfaces. 499 */ 500 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 501 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 502 udp6stat.udp6s_badsum++; 503 goto bad; 504 } 505 } 506 507 good: 508 return 0; 509 bad: 510 return -1; 511 } 512 513 int 514 udp6_input(struct mbuf **mp, int *offp, int proto) 515 { 516 struct mbuf *m = *mp; 517 int off = *offp; 518 struct sockaddr_in6 src, dst; 519 struct ip6_hdr *ip6; 520 struct udphdr *uh; 521 u_int32_t plen, ulen; 522 523 ip6 = mtod(m, struct ip6_hdr *); 524 525 #if defined(NFAITH) && 0 < NFAITH 526 if (faithprefix(&ip6->ip6_dst)) { 527 /* send icmp6 host unreach? */ 528 m_freem(m); 529 return IPPROTO_DONE; 530 } 531 #endif 532 533 udp6stat.udp6s_ipackets++; 534 535 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 536 plen = m->m_pkthdr.len - off; 537 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 538 if (uh == NULL) { 539 ip6stat.ip6s_tooshort++; 540 return IPPROTO_DONE; 541 } 542 KASSERT(UDP_HDR_ALIGNED_P(uh)); 543 ulen = ntohs((u_short)uh->uh_ulen); 544 /* 545 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 546 * iff payload length > 0xffff. 547 */ 548 if (ulen == 0 && plen > 0xffff) 549 ulen = plen; 550 551 if (plen != ulen) { 552 udp6stat.udp6s_badlen++; 553 goto bad; 554 } 555 556 /* destination port of 0 is illegal, based on RFC768. */ 557 if (uh->uh_dport == 0) 558 goto bad; 559 560 /* Be proactive about malicious use of IPv4 mapped address */ 561 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 562 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 563 /* XXX stat */ 564 goto bad; 565 } 566 567 /* 568 * Checksum extended UDP header and data. Maybe skip checksum 569 * on loopback interfaces. 570 */ 571 if (udp6_input_checksum(m, uh, off, ulen)) 572 goto bad; 573 574 /* 575 * Construct source and dst sockaddrs. 576 */ 577 bzero(&src, sizeof(src)); 578 src.sin6_family = AF_INET6; 579 src.sin6_len = sizeof(struct sockaddr_in6); 580 src.sin6_addr = ip6->ip6_src; 581 src.sin6_port = uh->uh_sport; 582 bzero(&dst, sizeof(dst)); 583 dst.sin6_family = AF_INET6; 584 dst.sin6_len = sizeof(struct sockaddr_in6); 585 dst.sin6_addr = ip6->ip6_dst; 586 dst.sin6_port = uh->uh_dport; 587 588 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 589 if (m->m_flags & M_MCAST) { 590 udp6stat.udp6s_noportmcast++; 591 goto bad; 592 } 593 udp6stat.udp6s_noport++; 594 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 595 m = NULL; 596 } 597 598 bad: 599 if (m) 600 m_freem(m); 601 return IPPROTO_DONE; 602 } 603 #endif 604 605 #ifdef INET 606 static void 607 udp4_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 inpcb *inp = NULL; 613 614 if (!so) 615 return; 616 switch (so->so_proto->pr_domain->dom_family) { 617 case AF_INET: 618 inp = sotoinpcb(so); 619 break; 620 #ifdef INET6 621 case AF_INET6: 622 break; 623 #endif 624 default: 625 return; 626 } 627 628 #if defined(IPSEC) || defined(FAST_IPSEC) 629 /* check AH/ESP integrity. */ 630 if (so != NULL && ipsec4_in_reject_so(m, so)) { 631 ipsecstat.in_polvio++; 632 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 633 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 634 0, 0); 635 return; 636 } 637 #endif /*IPSEC*/ 638 639 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 640 if (inp && (inp->inp_flags & INP_CONTROLOPTS 641 || so->so_options & SO_TIMESTAMP)) { 642 struct ip *ip = mtod(n, struct ip *); 643 ip_savecontrol(inp, &opts, ip, n); 644 } 645 646 m_adj(n, off); 647 if (sbappendaddr(&so->so_rcv, src, n, 648 opts) == 0) { 649 m_freem(n); 650 if (opts) 651 m_freem(opts); 652 so->so_rcv.sb_overflowed++; 653 udpstat.udps_fullsock++; 654 } else 655 sorwakeup(so); 656 } 657 } 658 #endif 659 660 #ifdef INET6 661 static void 662 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 663 struct sockaddr *src, struct socket *so) 664 { 665 struct mbuf *opts = NULL; 666 struct mbuf *n; 667 struct in6pcb *in6p = NULL; 668 669 if (!so) 670 return; 671 if (so->so_proto->pr_domain->dom_family != AF_INET6) 672 return; 673 in6p = sotoin6pcb(so); 674 675 #if defined(IPSEC) || defined(FAST_IPSEC) 676 /* check AH/ESP integrity. */ 677 if (so != NULL && ipsec6_in_reject_so(m, so)) { 678 ipsec6stat.in_polvio++; 679 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 680 icmp6_error(n, ICMP6_DST_UNREACH, 681 ICMP6_DST_UNREACH_ADMIN, 0); 682 return; 683 } 684 #endif /*IPSEC*/ 685 686 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 687 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 688 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 689 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 690 ip6_savecontrol(in6p, &opts, ip6, n); 691 } 692 693 m_adj(n, off); 694 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 695 m_freem(n); 696 if (opts) 697 m_freem(opts); 698 so->so_rcv.sb_overflowed++; 699 udp6stat.udp6s_fullsock++; 700 } else 701 sorwakeup(so); 702 } 703 } 704 #endif 705 706 #ifdef INET 707 static int 708 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 709 struct mbuf **mp, int off /* offset of udphdr */) 710 { 711 u_int16_t *sport, *dport; 712 int rcvcnt; 713 struct in_addr *src4, *dst4; 714 struct inpcb_hdr *inph; 715 struct inpcb *inp; 716 struct mbuf *m = *mp; 717 718 rcvcnt = 0; 719 off += sizeof(struct udphdr); /* now, offset of payload */ 720 721 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 722 goto bad; 723 724 src4 = &src->sin_addr; 725 sport = &src->sin_port; 726 dst4 = &dst->sin_addr; 727 dport = &dst->sin_port; 728 729 if (IN_MULTICAST(dst4->s_addr) || 730 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 731 /* 732 * Deliver a multicast or broadcast datagram to *all* sockets 733 * for which the local and remote addresses and ports match 734 * those of the incoming datagram. This allows more than 735 * one process to receive multi/broadcasts on the same port. 736 * (This really ought to be done for unicast datagrams as 737 * well, but that would cause problems with existing 738 * applications that open both address-specific sockets and 739 * a wildcard socket listening to the same port -- they would 740 * end up receiving duplicates of every unicast datagram. 741 * Those applications open the multiple sockets to overcome an 742 * inadequacy of the UDP socket interface, but for backwards 743 * compatibility we avoid the problem here rather than 744 * fixing the interface. Maybe 4.5BSD will remedy this?) 745 */ 746 747 /* 748 * KAME note: traditionally we dropped udpiphdr from mbuf here. 749 * we need udpiphdr for IPsec processing so we do that later. 750 */ 751 /* 752 * Locate pcb(s) for datagram. 753 */ 754 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 755 inp = (struct inpcb *)inph; 756 if (inp->inp_af != AF_INET) 757 continue; 758 759 if (inp->inp_lport != *dport) 760 continue; 761 if (!in_nullhost(inp->inp_laddr)) { 762 if (!in_hosteq(inp->inp_laddr, *dst4)) 763 continue; 764 } 765 if (!in_nullhost(inp->inp_faddr)) { 766 if (!in_hosteq(inp->inp_faddr, *src4) || 767 inp->inp_fport != *sport) 768 continue; 769 } 770 771 udp4_sendup(m, off, (struct sockaddr *)src, 772 inp->inp_socket); 773 rcvcnt++; 774 775 /* 776 * Don't look for additional matches if this one does 777 * not have either the SO_REUSEPORT or SO_REUSEADDR 778 * socket options set. This heuristic avoids searching 779 * through all pcbs in the common case of a non-shared 780 * port. It assumes that an application will never 781 * clear these options after setting them. 782 */ 783 if ((inp->inp_socket->so_options & 784 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 785 break; 786 } 787 } else { 788 /* 789 * Locate pcb for datagram. 790 */ 791 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 792 if (inp == 0) { 793 ++udpstat.udps_pcbhashmiss; 794 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 795 if (inp == 0) 796 return rcvcnt; 797 } 798 799 #ifdef IPSEC_NAT_T 800 /* Handle ESP over UDP */ 801 if (inp->inp_flags & INP_ESPINUDP_ALL) { 802 struct sockaddr *sa = (struct sockaddr *)src; 803 804 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 805 case -1: /* Error, m was freeed */ 806 rcvcnt = -1; 807 goto bad; 808 break; 809 810 case 1: /* ESP over UDP */ 811 rcvcnt++; 812 goto bad; 813 break; 814 815 case 0: /* plain UDP */ 816 default: /* Unexpected */ 817 /* 818 * Normal UDP processing will take place 819 * m may have changed. 820 */ 821 m = *mp; 822 break; 823 } 824 } 825 #endif 826 827 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 828 rcvcnt++; 829 } 830 831 bad: 832 return rcvcnt; 833 } 834 #endif 835 836 #ifdef INET6 837 static int 838 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 839 struct mbuf *m, int off) 840 { 841 u_int16_t sport, dport; 842 int rcvcnt; 843 struct in6_addr src6, *dst6; 844 const struct in_addr *dst4; 845 struct inpcb_hdr *inph; 846 struct in6pcb *in6p; 847 848 rcvcnt = 0; 849 off += sizeof(struct udphdr); /* now, offset of payload */ 850 851 if (af != AF_INET && af != AF_INET6) 852 goto bad; 853 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 854 goto bad; 855 856 src6 = src->sin6_addr; 857 if (sa6_recoverscope(src) != 0) { 858 /* XXX: should be impossible. */ 859 goto bad; 860 } 861 sport = src->sin6_port; 862 863 dport = dst->sin6_port; 864 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 865 dst6 = &dst->sin6_addr; 866 867 if (IN6_IS_ADDR_MULTICAST(dst6) || 868 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 869 /* 870 * Deliver a multicast or broadcast datagram to *all* sockets 871 * for which the local and remote addresses and ports match 872 * those of the incoming datagram. This allows more than 873 * one process to receive multi/broadcasts on the same port. 874 * (This really ought to be done for unicast datagrams as 875 * well, but that would cause problems with existing 876 * applications that open both address-specific sockets and 877 * a wildcard socket listening to the same port -- they would 878 * end up receiving duplicates of every unicast datagram. 879 * Those applications open the multiple sockets to overcome an 880 * inadequacy of the UDP socket interface, but for backwards 881 * compatibility we avoid the problem here rather than 882 * fixing the interface. Maybe 4.5BSD will remedy this?) 883 */ 884 885 /* 886 * KAME note: traditionally we dropped udpiphdr from mbuf here. 887 * we need udpiphdr for IPsec processing so we do that later. 888 */ 889 /* 890 * Locate pcb(s) for datagram. 891 */ 892 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 893 in6p = (struct in6pcb *)inph; 894 if (in6p->in6p_af != AF_INET6) 895 continue; 896 897 if (in6p->in6p_lport != dport) 898 continue; 899 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 900 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 901 dst6)) 902 continue; 903 } else { 904 if (IN6_IS_ADDR_V4MAPPED(dst6) && 905 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 906 continue; 907 } 908 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 909 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 910 &src6) || in6p->in6p_fport != sport) 911 continue; 912 } else { 913 if (IN6_IS_ADDR_V4MAPPED(&src6) && 914 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 915 continue; 916 } 917 918 udp6_sendup(m, off, (struct sockaddr *)src, 919 in6p->in6p_socket); 920 rcvcnt++; 921 922 /* 923 * Don't look for additional matches if this one does 924 * not have either the SO_REUSEPORT or SO_REUSEADDR 925 * socket options set. This heuristic avoids searching 926 * through all pcbs in the common case of a non-shared 927 * port. It assumes that an application will never 928 * clear these options after setting them. 929 */ 930 if ((in6p->in6p_socket->so_options & 931 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 932 break; 933 } 934 } else { 935 /* 936 * Locate pcb for datagram. 937 */ 938 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 939 dport, 0); 940 if (in6p == 0) { 941 ++udpstat.udps_pcbhashmiss; 942 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 943 if (in6p == 0) 944 return rcvcnt; 945 } 946 947 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 948 rcvcnt++; 949 } 950 951 bad: 952 return rcvcnt; 953 } 954 #endif 955 956 #ifdef INET 957 /* 958 * Notify a udp user of an asynchronous error; 959 * just wake up so that he can collect error status. 960 */ 961 static void 962 udp_notify(struct inpcb *inp, int errno) 963 { 964 inp->inp_socket->so_error = errno; 965 sorwakeup(inp->inp_socket); 966 sowwakeup(inp->inp_socket); 967 } 968 969 void * 970 udp_ctlinput(int cmd, struct sockaddr *sa, void *v) 971 { 972 struct ip *ip = v; 973 struct udphdr *uh; 974 void (*notify)(struct inpcb *, int) = udp_notify; 975 int errno; 976 977 if (sa->sa_family != AF_INET 978 || sa->sa_len != sizeof(struct sockaddr_in)) 979 return NULL; 980 if ((unsigned)cmd >= PRC_NCMDS) 981 return NULL; 982 errno = inetctlerrmap[cmd]; 983 if (PRC_IS_REDIRECT(cmd)) 984 notify = in_rtchange, ip = 0; 985 else if (cmd == PRC_HOSTDEAD) 986 ip = 0; 987 else if (errno == 0) 988 return NULL; 989 if (ip) { 990 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 991 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 992 ip->ip_src, uh->uh_sport, errno, notify); 993 994 /* XXX mapped address case */ 995 } else 996 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 997 notify); 998 return NULL; 999 } 1000 1001 int 1002 udp_ctloutput(op, so, level, optname, mp) 1003 int op; 1004 struct socket *so; 1005 int level, optname; 1006 struct mbuf **mp; 1007 { 1008 int s; 1009 int error = 0; 1010 struct mbuf *m; 1011 struct inpcb *inp; 1012 int family; 1013 1014 family = so->so_proto->pr_domain->dom_family; 1015 1016 s = splsoftnet(); 1017 switch (family) { 1018 #ifdef INET 1019 case PF_INET: 1020 if (level != IPPROTO_UDP) { 1021 error = ip_ctloutput(op, so, level, optname, mp); 1022 goto end; 1023 } 1024 break; 1025 #endif 1026 #ifdef INET6 1027 case PF_INET6: 1028 if (level != IPPROTO_UDP) { 1029 error = ip6_ctloutput(op, so, level, optname, mp); 1030 goto end; 1031 } 1032 break; 1033 #endif 1034 default: 1035 error = EAFNOSUPPORT; 1036 goto end; 1037 break; 1038 } 1039 1040 1041 switch (op) { 1042 case PRCO_SETOPT: 1043 m = *mp; 1044 inp = sotoinpcb(so); 1045 1046 switch (optname) { 1047 case UDP_ENCAP: 1048 if (m == NULL || m->m_len < sizeof (int)) { 1049 error = EINVAL; 1050 goto end; 1051 } 1052 1053 switch(*mtod(m, int *)) { 1054 #ifdef IPSEC_NAT_T 1055 case 0: 1056 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1057 break; 1058 1059 case UDP_ENCAP_ESPINUDP: 1060 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1061 inp->inp_flags |= INP_ESPINUDP; 1062 break; 1063 1064 case UDP_ENCAP_ESPINUDP_NON_IKE: 1065 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1066 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1067 break; 1068 #endif 1069 default: 1070 error = EINVAL; 1071 goto end; 1072 break; 1073 } 1074 break; 1075 1076 default: 1077 error = ENOPROTOOPT; 1078 goto end; 1079 break; 1080 } 1081 break; 1082 1083 default: 1084 error = EINVAL; 1085 goto end; 1086 break; 1087 } 1088 1089 end: 1090 splx(s); 1091 return error; 1092 } 1093 1094 1095 int 1096 udp_output(struct mbuf *m, ...) 1097 { 1098 struct inpcb *inp; 1099 struct udpiphdr *ui; 1100 struct route *ro; 1101 int len = m->m_pkthdr.len; 1102 int error = 0; 1103 va_list ap; 1104 1105 MCLAIM(m, &udp_tx_mowner); 1106 va_start(ap, m); 1107 inp = va_arg(ap, struct inpcb *); 1108 va_end(ap); 1109 1110 /* 1111 * Calculate data length and get a mbuf 1112 * for UDP and IP headers. 1113 */ 1114 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1115 if (m == 0) { 1116 error = ENOBUFS; 1117 goto release; 1118 } 1119 1120 /* 1121 * Compute the packet length of the IP header, and 1122 * punt if the length looks bogus. 1123 */ 1124 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1125 error = EMSGSIZE; 1126 goto release; 1127 } 1128 1129 /* 1130 * Fill in mbuf with extended UDP header 1131 * and addresses and length put into network format. 1132 */ 1133 ui = mtod(m, struct udpiphdr *); 1134 ui->ui_pr = IPPROTO_UDP; 1135 ui->ui_src = inp->inp_laddr; 1136 ui->ui_dst = inp->inp_faddr; 1137 ui->ui_sport = inp->inp_lport; 1138 ui->ui_dport = inp->inp_fport; 1139 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1140 1141 ro = &inp->inp_route; 1142 1143 /* 1144 * Set up checksum and output datagram. 1145 */ 1146 if (udpcksum) { 1147 /* 1148 * XXX Cache pseudo-header checksum part for 1149 * XXX "connected" UDP sockets. 1150 */ 1151 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1152 ui->ui_dst.s_addr, htons((u_int16_t)len + 1153 sizeof(struct udphdr) + IPPROTO_UDP)); 1154 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1155 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1156 } else 1157 ui->ui_sum = 0; 1158 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1159 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1160 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1161 udpstat.udps_opackets++; 1162 1163 return (ip_output(m, inp->inp_options, ro, 1164 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1165 inp->inp_moptions, inp->inp_socket)); 1166 1167 release: 1168 m_freem(m); 1169 return (error); 1170 } 1171 1172 int udp_sendspace = 9216; /* really max datagram size */ 1173 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1174 /* 40 1K datagrams */ 1175 1176 /*ARGSUSED*/ 1177 int 1178 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1179 struct mbuf *control, struct lwp *l) 1180 { 1181 struct inpcb *inp; 1182 int s; 1183 int error = 0; 1184 1185 if (req == PRU_CONTROL) 1186 return (in_control(so, (long)m, (caddr_t)nam, 1187 (struct ifnet *)control, l)); 1188 1189 if (req == PRU_PURGEIF) { 1190 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1191 in_purgeif((struct ifnet *)control); 1192 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1193 return (0); 1194 } 1195 1196 s = splsoftnet(); 1197 inp = sotoinpcb(so); 1198 #ifdef DIAGNOSTIC 1199 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1200 panic("udp_usrreq: unexpected control mbuf"); 1201 #endif 1202 if (inp == 0 && req != PRU_ATTACH) { 1203 error = EINVAL; 1204 goto release; 1205 } 1206 1207 /* 1208 * Note: need to block udp_input while changing 1209 * the udp pcb queue and/or pcb addresses. 1210 */ 1211 switch (req) { 1212 1213 case PRU_ATTACH: 1214 if (inp != 0) { 1215 error = EISCONN; 1216 break; 1217 } 1218 #ifdef MBUFTRACE 1219 so->so_mowner = &udp_mowner; 1220 so->so_rcv.sb_mowner = &udp_rx_mowner; 1221 so->so_snd.sb_mowner = &udp_tx_mowner; 1222 #endif 1223 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1224 error = soreserve(so, udp_sendspace, udp_recvspace); 1225 if (error) 1226 break; 1227 } 1228 error = in_pcballoc(so, &udbtable); 1229 if (error) 1230 break; 1231 inp = sotoinpcb(so); 1232 inp->inp_ip.ip_ttl = ip_defttl; 1233 break; 1234 1235 case PRU_DETACH: 1236 in_pcbdetach(inp); 1237 break; 1238 1239 case PRU_BIND: 1240 error = in_pcbbind(inp, nam, l); 1241 break; 1242 1243 case PRU_LISTEN: 1244 error = EOPNOTSUPP; 1245 break; 1246 1247 case PRU_CONNECT: 1248 error = in_pcbconnect(inp, nam, l); 1249 if (error) 1250 break; 1251 soisconnected(so); 1252 break; 1253 1254 case PRU_CONNECT2: 1255 error = EOPNOTSUPP; 1256 break; 1257 1258 case PRU_DISCONNECT: 1259 /*soisdisconnected(so);*/ 1260 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1261 in_pcbdisconnect(inp); 1262 inp->inp_laddr = zeroin_addr; /* XXX */ 1263 in_pcbstate(inp, INP_BOUND); /* XXX */ 1264 break; 1265 1266 case PRU_SHUTDOWN: 1267 socantsendmore(so); 1268 break; 1269 1270 case PRU_RCVD: 1271 error = EOPNOTSUPP; 1272 break; 1273 1274 case PRU_SEND: 1275 if (control && control->m_len) { 1276 m_freem(control); 1277 m_freem(m); 1278 error = EINVAL; 1279 break; 1280 } 1281 { 1282 struct in_addr laddr; /* XXX */ 1283 1284 if (nam) { 1285 laddr = inp->inp_laddr; /* XXX */ 1286 if ((so->so_state & SS_ISCONNECTED) != 0) { 1287 error = EISCONN; 1288 goto die; 1289 } 1290 error = in_pcbconnect(inp, nam, l); 1291 if (error) 1292 goto die; 1293 } else { 1294 if ((so->so_state & SS_ISCONNECTED) == 0) { 1295 error = ENOTCONN; 1296 goto die; 1297 } 1298 } 1299 error = udp_output(m, inp); 1300 m = NULL; 1301 if (nam) { 1302 in_pcbdisconnect(inp); 1303 inp->inp_laddr = laddr; /* XXX */ 1304 in_pcbstate(inp, INP_BOUND); /* XXX */ 1305 } 1306 die: 1307 if (m) 1308 m_freem(m); 1309 } 1310 break; 1311 1312 case PRU_SENSE: 1313 /* 1314 * stat: don't bother with a blocksize. 1315 */ 1316 splx(s); 1317 return (0); 1318 1319 case PRU_RCVOOB: 1320 error = EOPNOTSUPP; 1321 break; 1322 1323 case PRU_SENDOOB: 1324 m_freem(control); 1325 m_freem(m); 1326 error = EOPNOTSUPP; 1327 break; 1328 1329 case PRU_SOCKADDR: 1330 in_setsockaddr(inp, nam); 1331 break; 1332 1333 case PRU_PEERADDR: 1334 in_setpeeraddr(inp, nam); 1335 break; 1336 1337 default: 1338 panic("udp_usrreq"); 1339 } 1340 1341 release: 1342 splx(s); 1343 return (error); 1344 } 1345 1346 /* 1347 * Sysctl for udp variables. 1348 */ 1349 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1350 { 1351 1352 sysctl_createv(clog, 0, NULL, NULL, 1353 CTLFLAG_PERMANENT, 1354 CTLTYPE_NODE, "net", NULL, 1355 NULL, 0, NULL, 0, 1356 CTL_NET, CTL_EOL); 1357 sysctl_createv(clog, 0, NULL, NULL, 1358 CTLFLAG_PERMANENT, 1359 CTLTYPE_NODE, "inet", NULL, 1360 NULL, 0, NULL, 0, 1361 CTL_NET, PF_INET, CTL_EOL); 1362 sysctl_createv(clog, 0, NULL, NULL, 1363 CTLFLAG_PERMANENT, 1364 CTLTYPE_NODE, "udp", 1365 SYSCTL_DESCR("UDPv4 related settings"), 1366 NULL, 0, NULL, 0, 1367 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1368 1369 sysctl_createv(clog, 0, NULL, NULL, 1370 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1371 CTLTYPE_INT, "checksum", 1372 SYSCTL_DESCR("Compute UDP checksums"), 1373 NULL, 0, &udpcksum, 0, 1374 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1375 CTL_EOL); 1376 sysctl_createv(clog, 0, NULL, NULL, 1377 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1378 CTLTYPE_INT, "sendspace", 1379 SYSCTL_DESCR("Default UDP send buffer size"), 1380 NULL, 0, &udp_sendspace, 0, 1381 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1382 CTL_EOL); 1383 sysctl_createv(clog, 0, NULL, NULL, 1384 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1385 CTLTYPE_INT, "recvspace", 1386 SYSCTL_DESCR("Default UDP receive buffer size"), 1387 NULL, 0, &udp_recvspace, 0, 1388 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1389 CTL_EOL); 1390 sysctl_createv(clog, 0, NULL, NULL, 1391 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1392 CTLTYPE_INT, "do_loopback_cksum", 1393 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1394 NULL, 0, &udp_do_loopback_cksum, 0, 1395 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1396 CTL_EOL); 1397 sysctl_createv(clog, 0, NULL, NULL, 1398 CTLFLAG_PERMANENT, 1399 CTLTYPE_STRUCT, "pcblist", 1400 SYSCTL_DESCR("UDP protocol control block list"), 1401 sysctl_inpcblist, 0, &udbtable, 0, 1402 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1403 CTL_EOL); 1404 sysctl_createv(clog, 0, NULL, NULL, 1405 CTLFLAG_PERMANENT, 1406 CTLTYPE_STRUCT, "stats", 1407 SYSCTL_DESCR("UDP statistics"), 1408 NULL, 0, &udpstat, sizeof(udpstat), 1409 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1410 CTL_EOL); 1411 } 1412 #endif 1413 1414 #if (defined INET && defined IPSEC_NAT_T) 1415 /* 1416 * Returns: 1417 * 1 if the packet was processed 1418 * 0 if normal UDP processing should take place 1419 * -1 if an error occurent and m was freed 1420 */ 1421 static int 1422 udp4_espinudp(mp, off, src, so) 1423 struct mbuf **mp; 1424 int off; 1425 struct sockaddr *src; 1426 struct socket *so; 1427 { 1428 size_t len; 1429 caddr_t data; 1430 struct inpcb *inp; 1431 size_t skip = 0; 1432 size_t minlen; 1433 size_t iphdrlen; 1434 struct ip *ip; 1435 struct mbuf *n; 1436 struct m_tag *tag; 1437 struct udphdr *udphdr; 1438 u_int16_t sport, dport; 1439 struct mbuf *m = *mp; 1440 1441 /* 1442 * Collapse the mbuf chain if the first mbuf is too short 1443 * The longest case is: UDP + non ESP marker + ESP 1444 */ 1445 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1446 if (minlen > m->m_pkthdr.len) 1447 minlen = m->m_pkthdr.len; 1448 1449 if (m->m_len < minlen) { 1450 if ((*mp = m_pullup(m, minlen)) == NULL) { 1451 printf("udp4_espinudp: m_pullup failed\n"); 1452 return -1; 1453 } 1454 m = *mp; 1455 } 1456 1457 len = m->m_len - off; 1458 data = mtod(m, caddr_t) + off; 1459 inp = sotoinpcb(so); 1460 1461 /* Ignore keepalive packets */ 1462 if ((len == 1) && (data[0] == '\xff')) { 1463 return 1; 1464 } 1465 1466 /* 1467 * Check that the payload is long enough to hold 1468 * an ESP header and compute the length of encapsulation 1469 * header to remove 1470 */ 1471 if (inp->inp_flags & INP_ESPINUDP) { 1472 u_int32_t *st = (u_int32_t *)data; 1473 1474 if ((len <= sizeof(struct esp)) || (*st == 0)) 1475 return 0; /* Normal UDP processing */ 1476 1477 skip = sizeof(struct udphdr); 1478 } 1479 1480 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1481 u_int32_t *st = (u_int32_t *)data; 1482 1483 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1484 || ((st[0] | st[1]) != 0)) 1485 return 0; /* Normal UDP processing */ 1486 1487 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1488 } 1489 1490 /* 1491 * Get the UDP ports. They are handled in network 1492 * order everywhere in IPSEC_NAT_T code. 1493 */ 1494 udphdr = (struct udphdr *)(data - skip); 1495 sport = udphdr->uh_sport; 1496 dport = udphdr->uh_dport; 1497 1498 /* 1499 * Remove the UDP header (and possibly the non ESP marker) 1500 * IP header lendth is iphdrlen 1501 * Before: 1502 * <--- off ---> 1503 * +----+------+-----+ 1504 * | IP | UDP | ESP | 1505 * +----+------+-----+ 1506 * <-skip-> 1507 * After: 1508 * +----+-----+ 1509 * | IP | ESP | 1510 * +----+-----+ 1511 * <-skip-> 1512 */ 1513 iphdrlen = off - sizeof(struct udphdr); 1514 memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen); 1515 m_adj(m, skip); 1516 1517 ip = mtod(m, struct ip *); 1518 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1519 ip->ip_p = IPPROTO_ESP; 1520 1521 /* 1522 * Copy the mbuf to avoid multiple free, as both 1523 * esp4_input (which we call) and udp_input (which 1524 * called us) free the mbuf. 1525 */ 1526 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1527 printf("udp4_espinudp: m_dup failed\n"); 1528 return 0; 1529 } 1530 1531 /* 1532 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1533 * the source UDP port. This is required if we want 1534 * to select the right SPD for multiple hosts behind 1535 * same NAT 1536 */ 1537 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1538 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1539 printf("udp4_espinudp: m_tag_get failed\n"); 1540 m_freem(n); 1541 return 0; 1542 } 1543 ((u_int16_t *)(tag + 1))[0] = sport; 1544 ((u_int16_t *)(tag + 1))[1] = dport; 1545 m_tag_prepend(n, tag); 1546 1547 #ifdef FAST_IPSEC 1548 ipsec4_common_input(n, iphdrlen); 1549 #else 1550 esp4_input(n, iphdrlen); 1551 #endif 1552 1553 /* We handled it, it shoudln't be handled by UDP */ 1554 return 1; 1555 } 1556 #endif 1557