1 /* $NetBSD: udp_usrreq.c,v 1.163 2007/11/27 22:45:30 christos 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 1.163 2007/11/27 22:45:30 christos 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 int udpcksum = 1; 143 int udp_do_loopback_cksum = 0; 144 145 struct inpcbtable udbtable; 146 struct udpstat udpstat; 147 148 #ifdef INET 149 #ifdef IPSEC_NAT_T 150 static int udp4_espinudp (struct mbuf **, int, struct sockaddr *, 151 struct socket *); 152 #endif 153 static void udp4_sendup (struct mbuf *, int, struct sockaddr *, 154 struct socket *); 155 static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, 156 struct mbuf **, int); 157 static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); 158 #endif 159 #ifdef INET6 160 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 161 struct socket *); 162 static int udp6_realinput (int, struct sockaddr_in6 *, 163 struct sockaddr_in6 *, struct mbuf *, int); 164 static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int); 165 #endif 166 #ifdef INET 167 static void udp_notify (struct inpcb *, int); 168 #endif 169 170 #ifndef UDBHASHSIZE 171 #define UDBHASHSIZE 128 172 #endif 173 int udbhashsize = UDBHASHSIZE; 174 175 #ifdef MBUFTRACE 176 struct mowner udp_mowner = MOWNER_INIT("udp", ""); 177 struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx"); 178 struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx"); 179 #endif 180 181 #ifdef UDP_CSUM_COUNTERS 182 #include <sys/device.h> 183 184 #if defined(INET) 185 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 186 NULL, "udp", "hwcsum bad"); 187 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 188 NULL, "udp", "hwcsum ok"); 189 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 190 NULL, "udp", "hwcsum data"); 191 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 192 NULL, "udp", "swcsum"); 193 194 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 195 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 196 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 197 EVCNT_ATTACH_STATIC(udp_swcsum); 198 #endif /* defined(INET) */ 199 200 #if defined(INET6) 201 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 202 NULL, "udp6", "hwcsum bad"); 203 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 204 NULL, "udp6", "hwcsum ok"); 205 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 206 NULL, "udp6", "hwcsum data"); 207 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 208 NULL, "udp6", "swcsum"); 209 210 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 211 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 212 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 213 EVCNT_ATTACH_STATIC(udp6_swcsum); 214 #endif /* defined(INET6) */ 215 216 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 217 218 #else 219 220 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 221 222 #endif /* UDP_CSUM_COUNTERS */ 223 224 void 225 udp_init(void) 226 { 227 228 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 229 230 MOWNER_ATTACH(&udp_tx_mowner); 231 MOWNER_ATTACH(&udp_rx_mowner); 232 MOWNER_ATTACH(&udp_mowner); 233 } 234 235 /* 236 * Checksum extended UDP header and data. 237 */ 238 239 int 240 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 241 int iphlen, int len) 242 { 243 244 switch (af) { 245 #ifdef INET 246 case AF_INET: 247 return udp4_input_checksum(m, uh, iphlen, len); 248 #endif 249 #ifdef INET6 250 case AF_INET6: 251 return udp6_input_checksum(m, uh, iphlen, len); 252 #endif 253 } 254 #ifdef DIAGNOSTIC 255 panic("udp_input_checksum: unknown af %d", af); 256 #endif 257 /* NOTREACHED */ 258 return -1; 259 } 260 261 #ifdef INET 262 263 /* 264 * Checksum extended UDP header and data. 265 */ 266 267 static int 268 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 269 int iphlen, int len) 270 { 271 272 /* 273 * XXX it's better to record and check if this mbuf is 274 * already checked. 275 */ 276 277 if (uh->uh_sum == 0) 278 return 0; 279 280 switch (m->m_pkthdr.csum_flags & 281 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 282 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 283 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 284 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 285 goto badcsum; 286 287 case M_CSUM_UDPv4|M_CSUM_DATA: { 288 u_int32_t hw_csum = m->m_pkthdr.csum_data; 289 290 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 291 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 292 const struct ip *ip = 293 mtod(m, const struct ip *); 294 295 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 296 ip->ip_dst.s_addr, 297 htons(hw_csum + len + IPPROTO_UDP)); 298 } 299 if ((hw_csum ^ 0xffff) != 0) 300 goto badcsum; 301 break; 302 } 303 304 case M_CSUM_UDPv4: 305 /* Checksum was okay. */ 306 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 307 break; 308 309 default: 310 /* 311 * Need to compute it ourselves. Maybe skip checksum 312 * on loopback interfaces. 313 */ 314 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 315 IFF_LOOPBACK) || 316 udp_do_loopback_cksum)) { 317 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 318 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 319 goto badcsum; 320 } 321 break; 322 } 323 324 return 0; 325 326 badcsum: 327 udpstat.udps_badsum++; 328 return -1; 329 } 330 331 void 332 udp_input(struct mbuf *m, ...) 333 { 334 va_list ap; 335 struct sockaddr_in src, dst; 336 struct ip *ip; 337 struct udphdr *uh; 338 int iphlen; 339 int len; 340 int n; 341 u_int16_t ip_len; 342 343 va_start(ap, m); 344 iphlen = va_arg(ap, int); 345 (void)va_arg(ap, int); /* ignore value, advance ap */ 346 va_end(ap); 347 348 MCLAIM(m, &udp_rx_mowner); 349 udpstat.udps_ipackets++; 350 351 /* 352 * Get IP and UDP header together in first mbuf. 353 */ 354 ip = mtod(m, struct ip *); 355 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 356 if (uh == NULL) { 357 udpstat.udps_hdrops++; 358 return; 359 } 360 KASSERT(UDP_HDR_ALIGNED_P(uh)); 361 362 /* destination port of 0 is illegal, based on RFC768. */ 363 if (uh->uh_dport == 0) 364 goto bad; 365 366 /* 367 * Make mbuf data length reflect UDP length. 368 * If not enough data to reflect UDP length, drop. 369 */ 370 ip_len = ntohs(ip->ip_len); 371 len = ntohs((u_int16_t)uh->uh_ulen); 372 if (ip_len != iphlen + len) { 373 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 374 udpstat.udps_badlen++; 375 goto bad; 376 } 377 m_adj(m, iphlen + len - ip_len); 378 } 379 380 /* 381 * Checksum extended UDP header and data. 382 */ 383 if (udp4_input_checksum(m, uh, iphlen, len)) 384 goto badcsum; 385 386 /* construct source and dst sockaddrs. */ 387 sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport); 388 sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport); 389 390 if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { 391 udpstat.udps_hdrops++; 392 return; 393 } 394 #ifdef INET6 395 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 396 struct sockaddr_in6 src6, dst6; 397 398 bzero(&src6, sizeof(src6)); 399 src6.sin6_family = AF_INET6; 400 src6.sin6_len = sizeof(struct sockaddr_in6); 401 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 402 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 403 sizeof(ip->ip_src)); 404 src6.sin6_port = uh->uh_sport; 405 bzero(&dst6, sizeof(dst6)); 406 dst6.sin6_family = AF_INET6; 407 dst6.sin6_len = sizeof(struct sockaddr_in6); 408 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 409 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 410 sizeof(ip->ip_dst)); 411 dst6.sin6_port = uh->uh_dport; 412 413 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 414 } 415 #endif 416 417 if (n == 0) { 418 if (m->m_flags & (M_BCAST | M_MCAST)) { 419 udpstat.udps_noportbcast++; 420 goto bad; 421 } 422 udpstat.udps_noport++; 423 #ifdef IPKDB 424 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 425 m, iphlen + sizeof(struct udphdr), 426 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 427 /* 428 * It was a debugger connect packet, 429 * just drop it now 430 */ 431 goto bad; 432 } 433 #endif 434 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 435 m = NULL; 436 } 437 438 bad: 439 if (m) 440 m_freem(m); 441 return; 442 443 badcsum: 444 m_freem(m); 445 } 446 #endif 447 448 #ifdef INET6 449 static int 450 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 451 { 452 453 /* 454 * XXX it's better to record and check if this mbuf is 455 * already checked. 456 */ 457 458 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 459 goto good; 460 } 461 if (uh->uh_sum == 0) { 462 udp6stat.udp6s_nosum++; 463 goto bad; 464 } 465 466 switch (m->m_pkthdr.csum_flags & 467 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 468 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 469 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 470 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 471 udp6stat.udp6s_badsum++; 472 goto bad; 473 474 #if 0 /* notyet */ 475 case M_CSUM_UDPv6|M_CSUM_DATA: 476 #endif 477 478 case M_CSUM_UDPv6: 479 /* Checksum was okay. */ 480 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 481 break; 482 483 default: 484 /* 485 * Need to compute it ourselves. Maybe skip checksum 486 * on loopback interfaces. 487 */ 488 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 489 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 490 udp6stat.udp6s_badsum++; 491 goto bad; 492 } 493 } 494 495 good: 496 return 0; 497 bad: 498 return -1; 499 } 500 501 int 502 udp6_input(struct mbuf **mp, int *offp, int proto) 503 { 504 struct mbuf *m = *mp; 505 int off = *offp; 506 struct sockaddr_in6 src, dst; 507 struct ip6_hdr *ip6; 508 struct udphdr *uh; 509 u_int32_t plen, ulen; 510 511 ip6 = mtod(m, struct ip6_hdr *); 512 513 #if defined(NFAITH) && 0 < NFAITH 514 if (faithprefix(&ip6->ip6_dst)) { 515 /* send icmp6 host unreach? */ 516 m_freem(m); 517 return IPPROTO_DONE; 518 } 519 #endif 520 521 udp6stat.udp6s_ipackets++; 522 523 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 524 plen = m->m_pkthdr.len - off; 525 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 526 if (uh == NULL) { 527 ip6stat.ip6s_tooshort++; 528 return IPPROTO_DONE; 529 } 530 KASSERT(UDP_HDR_ALIGNED_P(uh)); 531 ulen = ntohs((u_short)uh->uh_ulen); 532 /* 533 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 534 * iff payload length > 0xffff. 535 */ 536 if (ulen == 0 && plen > 0xffff) 537 ulen = plen; 538 539 if (plen != ulen) { 540 udp6stat.udp6s_badlen++; 541 goto bad; 542 } 543 544 /* destination port of 0 is illegal, based on RFC768. */ 545 if (uh->uh_dport == 0) 546 goto bad; 547 548 /* Be proactive about malicious use of IPv4 mapped address */ 549 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 550 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 551 /* XXX stat */ 552 goto bad; 553 } 554 555 /* 556 * Checksum extended UDP header and data. Maybe skip checksum 557 * on loopback interfaces. 558 */ 559 if (udp6_input_checksum(m, uh, off, ulen)) 560 goto bad; 561 562 /* 563 * Construct source and dst sockaddrs. 564 */ 565 bzero(&src, sizeof(src)); 566 src.sin6_family = AF_INET6; 567 src.sin6_len = sizeof(struct sockaddr_in6); 568 src.sin6_addr = ip6->ip6_src; 569 src.sin6_port = uh->uh_sport; 570 bzero(&dst, sizeof(dst)); 571 dst.sin6_family = AF_INET6; 572 dst.sin6_len = sizeof(struct sockaddr_in6); 573 dst.sin6_addr = ip6->ip6_dst; 574 dst.sin6_port = uh->uh_dport; 575 576 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 577 if (m->m_flags & M_MCAST) { 578 udp6stat.udp6s_noportmcast++; 579 goto bad; 580 } 581 udp6stat.udp6s_noport++; 582 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 583 m = NULL; 584 } 585 586 bad: 587 if (m) 588 m_freem(m); 589 return IPPROTO_DONE; 590 } 591 #endif 592 593 #ifdef INET 594 static void 595 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 596 struct sockaddr *src, struct socket *so) 597 { 598 struct mbuf *opts = NULL; 599 struct mbuf *n; 600 struct inpcb *inp = NULL; 601 602 if (!so) 603 return; 604 switch (so->so_proto->pr_domain->dom_family) { 605 case AF_INET: 606 inp = sotoinpcb(so); 607 break; 608 #ifdef INET6 609 case AF_INET6: 610 break; 611 #endif 612 default: 613 return; 614 } 615 616 #if defined(IPSEC) || defined(FAST_IPSEC) 617 /* check AH/ESP integrity. */ 618 if (so != NULL && ipsec4_in_reject_so(m, so)) { 619 ipsecstat.in_polvio++; 620 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 621 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 622 0, 0); 623 return; 624 } 625 #endif /*IPSEC*/ 626 627 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 628 if (inp && (inp->inp_flags & INP_CONTROLOPTS 629 || so->so_options & SO_TIMESTAMP)) { 630 struct ip *ip = mtod(n, struct ip *); 631 ip_savecontrol(inp, &opts, ip, n); 632 } 633 634 m_adj(n, off); 635 if (sbappendaddr(&so->so_rcv, src, n, 636 opts) == 0) { 637 m_freem(n); 638 if (opts) 639 m_freem(opts); 640 so->so_rcv.sb_overflowed++; 641 udpstat.udps_fullsock++; 642 } else 643 sorwakeup(so); 644 } 645 } 646 #endif 647 648 #ifdef INET6 649 static void 650 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 651 struct sockaddr *src, struct socket *so) 652 { 653 struct mbuf *opts = NULL; 654 struct mbuf *n; 655 struct in6pcb *in6p = NULL; 656 657 if (!so) 658 return; 659 if (so->so_proto->pr_domain->dom_family != AF_INET6) 660 return; 661 in6p = sotoin6pcb(so); 662 663 #if defined(IPSEC) || defined(FAST_IPSEC) 664 /* check AH/ESP integrity. */ 665 if (so != NULL && ipsec6_in_reject_so(m, so)) { 666 ipsec6stat.in_polvio++; 667 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 668 icmp6_error(n, ICMP6_DST_UNREACH, 669 ICMP6_DST_UNREACH_ADMIN, 0); 670 return; 671 } 672 #endif /*IPSEC*/ 673 674 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 675 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 676 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 677 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 678 ip6_savecontrol(in6p, &opts, ip6, n); 679 } 680 681 m_adj(n, off); 682 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 683 m_freem(n); 684 if (opts) 685 m_freem(opts); 686 so->so_rcv.sb_overflowed++; 687 udp6stat.udp6s_fullsock++; 688 } else 689 sorwakeup(so); 690 } 691 } 692 #endif 693 694 #ifdef INET 695 static int 696 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 697 struct mbuf **mp, int off /* offset of udphdr */) 698 { 699 u_int16_t *sport, *dport; 700 int rcvcnt; 701 struct in_addr *src4, *dst4; 702 struct inpcb_hdr *inph; 703 struct inpcb *inp; 704 struct mbuf *m = *mp; 705 706 rcvcnt = 0; 707 off += sizeof(struct udphdr); /* now, offset of payload */ 708 709 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 710 goto bad; 711 712 src4 = &src->sin_addr; 713 sport = &src->sin_port; 714 dst4 = &dst->sin_addr; 715 dport = &dst->sin_port; 716 717 if (IN_MULTICAST(dst4->s_addr) || 718 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 719 /* 720 * Deliver a multicast or broadcast datagram to *all* sockets 721 * for which the local and remote addresses and ports match 722 * those of the incoming datagram. This allows more than 723 * one process to receive multi/broadcasts on the same port. 724 * (This really ought to be done for unicast datagrams as 725 * well, but that would cause problems with existing 726 * applications that open both address-specific sockets and 727 * a wildcard socket listening to the same port -- they would 728 * end up receiving duplicates of every unicast datagram. 729 * Those applications open the multiple sockets to overcome an 730 * inadequacy of the UDP socket interface, but for backwards 731 * compatibility we avoid the problem here rather than 732 * fixing the interface. Maybe 4.5BSD will remedy this?) 733 */ 734 735 /* 736 * KAME note: traditionally we dropped udpiphdr from mbuf here. 737 * we need udpiphdr for IPsec processing so we do that later. 738 */ 739 /* 740 * Locate pcb(s) for datagram. 741 */ 742 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 743 inp = (struct inpcb *)inph; 744 if (inp->inp_af != AF_INET) 745 continue; 746 747 if (inp->inp_lport != *dport) 748 continue; 749 if (!in_nullhost(inp->inp_laddr)) { 750 if (!in_hosteq(inp->inp_laddr, *dst4)) 751 continue; 752 } 753 if (!in_nullhost(inp->inp_faddr)) { 754 if (!in_hosteq(inp->inp_faddr, *src4) || 755 inp->inp_fport != *sport) 756 continue; 757 } 758 759 udp4_sendup(m, off, (struct sockaddr *)src, 760 inp->inp_socket); 761 rcvcnt++; 762 763 /* 764 * Don't look for additional matches if this one does 765 * not have either the SO_REUSEPORT or SO_REUSEADDR 766 * socket options set. This heuristic avoids searching 767 * through all pcbs in the common case of a non-shared 768 * port. It assumes that an application will never 769 * clear these options after setting them. 770 */ 771 if ((inp->inp_socket->so_options & 772 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 773 break; 774 } 775 } else { 776 /* 777 * Locate pcb for datagram. 778 */ 779 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 780 if (inp == 0) { 781 ++udpstat.udps_pcbhashmiss; 782 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 783 if (inp == 0) 784 return rcvcnt; 785 } 786 787 #ifdef IPSEC_NAT_T 788 /* Handle ESP over UDP */ 789 if (inp->inp_flags & INP_ESPINUDP_ALL) { 790 struct sockaddr *sa = (struct sockaddr *)src; 791 792 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 793 case -1: /* Error, m was freeed */ 794 rcvcnt = -1; 795 goto bad; 796 break; 797 798 case 1: /* ESP over UDP */ 799 rcvcnt++; 800 goto bad; 801 break; 802 803 case 0: /* plain UDP */ 804 default: /* Unexpected */ 805 /* 806 * Normal UDP processing will take place 807 * m may have changed. 808 */ 809 m = *mp; 810 break; 811 } 812 } 813 #endif 814 815 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 816 rcvcnt++; 817 } 818 819 bad: 820 return rcvcnt; 821 } 822 #endif 823 824 #ifdef INET6 825 static int 826 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 827 struct mbuf *m, int off) 828 { 829 u_int16_t sport, dport; 830 int rcvcnt; 831 struct in6_addr src6, *dst6; 832 const struct in_addr *dst4; 833 struct inpcb_hdr *inph; 834 struct in6pcb *in6p; 835 836 rcvcnt = 0; 837 off += sizeof(struct udphdr); /* now, offset of payload */ 838 839 if (af != AF_INET && af != AF_INET6) 840 goto bad; 841 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 842 goto bad; 843 844 src6 = src->sin6_addr; 845 if (sa6_recoverscope(src) != 0) { 846 /* XXX: should be impossible. */ 847 goto bad; 848 } 849 sport = src->sin6_port; 850 851 dport = dst->sin6_port; 852 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 853 dst6 = &dst->sin6_addr; 854 855 if (IN6_IS_ADDR_MULTICAST(dst6) || 856 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 857 /* 858 * Deliver a multicast or broadcast datagram to *all* sockets 859 * for which the local and remote addresses and ports match 860 * those of the incoming datagram. This allows more than 861 * one process to receive multi/broadcasts on the same port. 862 * (This really ought to be done for unicast datagrams as 863 * well, but that would cause problems with existing 864 * applications that open both address-specific sockets and 865 * a wildcard socket listening to the same port -- they would 866 * end up receiving duplicates of every unicast datagram. 867 * Those applications open the multiple sockets to overcome an 868 * inadequacy of the UDP socket interface, but for backwards 869 * compatibility we avoid the problem here rather than 870 * fixing the interface. Maybe 4.5BSD will remedy this?) 871 */ 872 873 /* 874 * KAME note: traditionally we dropped udpiphdr from mbuf here. 875 * we need udpiphdr for IPsec processing so we do that later. 876 */ 877 /* 878 * Locate pcb(s) for datagram. 879 */ 880 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 881 in6p = (struct in6pcb *)inph; 882 if (in6p->in6p_af != AF_INET6) 883 continue; 884 885 if (in6p->in6p_lport != dport) 886 continue; 887 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 888 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 889 dst6)) 890 continue; 891 } else { 892 if (IN6_IS_ADDR_V4MAPPED(dst6) && 893 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 894 continue; 895 } 896 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 897 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 898 &src6) || in6p->in6p_fport != sport) 899 continue; 900 } else { 901 if (IN6_IS_ADDR_V4MAPPED(&src6) && 902 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 903 continue; 904 } 905 906 udp6_sendup(m, off, (struct sockaddr *)src, 907 in6p->in6p_socket); 908 rcvcnt++; 909 910 /* 911 * Don't look for additional matches if this one does 912 * not have either the SO_REUSEPORT or SO_REUSEADDR 913 * socket options set. This heuristic avoids searching 914 * through all pcbs in the common case of a non-shared 915 * port. It assumes that an application will never 916 * clear these options after setting them. 917 */ 918 if ((in6p->in6p_socket->so_options & 919 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 920 break; 921 } 922 } else { 923 /* 924 * Locate pcb for datagram. 925 */ 926 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 927 dport, 0); 928 if (in6p == 0) { 929 ++udpstat.udps_pcbhashmiss; 930 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 931 if (in6p == 0) 932 return rcvcnt; 933 } 934 935 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 936 rcvcnt++; 937 } 938 939 bad: 940 return rcvcnt; 941 } 942 #endif 943 944 #ifdef INET 945 /* 946 * Notify a udp user of an asynchronous error; 947 * just wake up so that he can collect error status. 948 */ 949 static void 950 udp_notify(struct inpcb *inp, int errno) 951 { 952 inp->inp_socket->so_error = errno; 953 sorwakeup(inp->inp_socket); 954 sowwakeup(inp->inp_socket); 955 } 956 957 void * 958 udp_ctlinput(int cmd, const struct sockaddr *sa, void *v) 959 { 960 struct ip *ip = v; 961 struct udphdr *uh; 962 void (*notify)(struct inpcb *, int) = udp_notify; 963 int errno; 964 965 if (sa->sa_family != AF_INET 966 || sa->sa_len != sizeof(struct sockaddr_in)) 967 return NULL; 968 if ((unsigned)cmd >= PRC_NCMDS) 969 return NULL; 970 errno = inetctlerrmap[cmd]; 971 if (PRC_IS_REDIRECT(cmd)) 972 notify = in_rtchange, ip = 0; 973 else if (cmd == PRC_HOSTDEAD) 974 ip = 0; 975 else if (errno == 0) 976 return NULL; 977 if (ip) { 978 uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2)); 979 in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport, 980 ip->ip_src, uh->uh_sport, errno, notify); 981 982 /* XXX mapped address case */ 983 } else 984 in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno, 985 notify); 986 return NULL; 987 } 988 989 int 990 udp_ctloutput(int op, struct socket *so, int level, int optname, 991 struct mbuf **mp) 992 { 993 int s; 994 int error = 0; 995 struct mbuf *m; 996 struct inpcb *inp; 997 int family; 998 999 family = so->so_proto->pr_domain->dom_family; 1000 1001 s = splsoftnet(); 1002 switch (family) { 1003 #ifdef INET 1004 case PF_INET: 1005 if (level != IPPROTO_UDP) { 1006 error = ip_ctloutput(op, so, level, optname, mp); 1007 goto end; 1008 } 1009 break; 1010 #endif 1011 #ifdef INET6 1012 case PF_INET6: 1013 if (level != IPPROTO_UDP) { 1014 error = ip6_ctloutput(op, so, level, optname, mp); 1015 goto end; 1016 } 1017 break; 1018 #endif 1019 default: 1020 error = EAFNOSUPPORT; 1021 goto end; 1022 } 1023 1024 1025 switch (op) { 1026 case PRCO_SETOPT: 1027 m = *mp; 1028 inp = sotoinpcb(so); 1029 1030 switch (optname) { 1031 case UDP_ENCAP: 1032 if (m == NULL || m->m_len != sizeof(int)) { 1033 error = EINVAL; 1034 break; 1035 } 1036 1037 switch(*mtod(m, int *)) { 1038 #ifdef IPSEC_NAT_T 1039 case 0: 1040 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1041 break; 1042 1043 case UDP_ENCAP_ESPINUDP: 1044 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1045 inp->inp_flags |= INP_ESPINUDP; 1046 break; 1047 1048 case UDP_ENCAP_ESPINUDP_NON_IKE: 1049 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1050 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1051 break; 1052 #endif 1053 default: 1054 error = EINVAL; 1055 break; 1056 } 1057 break; 1058 1059 default: 1060 error = ENOPROTOOPT; 1061 break; 1062 } 1063 if (m != NULL) { 1064 m_free(m); 1065 } 1066 break; 1067 1068 default: 1069 error = EINVAL; 1070 break; 1071 } 1072 1073 end: 1074 splx(s); 1075 return error; 1076 } 1077 1078 1079 int 1080 udp_output(struct mbuf *m, ...) 1081 { 1082 struct inpcb *inp; 1083 struct udpiphdr *ui; 1084 struct route *ro; 1085 int len = m->m_pkthdr.len; 1086 int error = 0; 1087 va_list ap; 1088 1089 MCLAIM(m, &udp_tx_mowner); 1090 va_start(ap, m); 1091 inp = va_arg(ap, struct inpcb *); 1092 va_end(ap); 1093 1094 /* 1095 * Calculate data length and get a mbuf 1096 * for UDP and IP headers. 1097 */ 1098 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1099 if (m == 0) { 1100 error = ENOBUFS; 1101 goto release; 1102 } 1103 1104 /* 1105 * Compute the packet length of the IP header, and 1106 * punt if the length looks bogus. 1107 */ 1108 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1109 error = EMSGSIZE; 1110 goto release; 1111 } 1112 1113 /* 1114 * Fill in mbuf with extended UDP header 1115 * and addresses and length put into network format. 1116 */ 1117 ui = mtod(m, struct udpiphdr *); 1118 ui->ui_pr = IPPROTO_UDP; 1119 ui->ui_src = inp->inp_laddr; 1120 ui->ui_dst = inp->inp_faddr; 1121 ui->ui_sport = inp->inp_lport; 1122 ui->ui_dport = inp->inp_fport; 1123 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1124 1125 ro = &inp->inp_route; 1126 1127 /* 1128 * Set up checksum and output datagram. 1129 */ 1130 if (udpcksum) { 1131 /* 1132 * XXX Cache pseudo-header checksum part for 1133 * XXX "connected" UDP sockets. 1134 */ 1135 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1136 ui->ui_dst.s_addr, htons((u_int16_t)len + 1137 sizeof(struct udphdr) + IPPROTO_UDP)); 1138 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1139 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1140 } else 1141 ui->ui_sum = 0; 1142 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1143 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1144 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1145 udpstat.udps_opackets++; 1146 1147 return (ip_output(m, inp->inp_options, ro, 1148 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1149 inp->inp_moptions, inp->inp_socket)); 1150 1151 release: 1152 m_freem(m); 1153 return (error); 1154 } 1155 1156 int udp_sendspace = 9216; /* really max datagram size */ 1157 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1158 /* 40 1K datagrams */ 1159 1160 /*ARGSUSED*/ 1161 int 1162 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1163 struct mbuf *control, struct lwp *l) 1164 { 1165 struct inpcb *inp; 1166 int s; 1167 int error = 0; 1168 1169 if (req == PRU_CONTROL) 1170 return (in_control(so, (long)m, (void *)nam, 1171 (struct ifnet *)control, l)); 1172 1173 s = splsoftnet(); 1174 1175 if (req == PRU_PURGEIF) { 1176 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1177 in_purgeif((struct ifnet *)control); 1178 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1179 splx(s); 1180 return (0); 1181 } 1182 1183 inp = sotoinpcb(so); 1184 #ifdef DIAGNOSTIC 1185 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1186 panic("udp_usrreq: unexpected control mbuf"); 1187 #endif 1188 if (inp == 0 && req != PRU_ATTACH) { 1189 error = EINVAL; 1190 goto release; 1191 } 1192 1193 /* 1194 * Note: need to block udp_input while changing 1195 * the udp pcb queue and/or pcb addresses. 1196 */ 1197 switch (req) { 1198 1199 case PRU_ATTACH: 1200 if (inp != 0) { 1201 error = EISCONN; 1202 break; 1203 } 1204 #ifdef MBUFTRACE 1205 so->so_mowner = &udp_mowner; 1206 so->so_rcv.sb_mowner = &udp_rx_mowner; 1207 so->so_snd.sb_mowner = &udp_tx_mowner; 1208 #endif 1209 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1210 error = soreserve(so, udp_sendspace, udp_recvspace); 1211 if (error) 1212 break; 1213 } 1214 error = in_pcballoc(so, &udbtable); 1215 if (error) 1216 break; 1217 inp = sotoinpcb(so); 1218 inp->inp_ip.ip_ttl = ip_defttl; 1219 break; 1220 1221 case PRU_DETACH: 1222 in_pcbdetach(inp); 1223 break; 1224 1225 case PRU_BIND: 1226 error = in_pcbbind(inp, nam, l); 1227 break; 1228 1229 case PRU_LISTEN: 1230 error = EOPNOTSUPP; 1231 break; 1232 1233 case PRU_CONNECT: 1234 error = in_pcbconnect(inp, nam, l); 1235 if (error) 1236 break; 1237 soisconnected(so); 1238 break; 1239 1240 case PRU_CONNECT2: 1241 error = EOPNOTSUPP; 1242 break; 1243 1244 case PRU_DISCONNECT: 1245 /*soisdisconnected(so);*/ 1246 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1247 in_pcbdisconnect(inp); 1248 inp->inp_laddr = zeroin_addr; /* XXX */ 1249 in_pcbstate(inp, INP_BOUND); /* XXX */ 1250 break; 1251 1252 case PRU_SHUTDOWN: 1253 socantsendmore(so); 1254 break; 1255 1256 case PRU_RCVD: 1257 error = EOPNOTSUPP; 1258 break; 1259 1260 case PRU_SEND: 1261 if (control && control->m_len) { 1262 m_freem(control); 1263 m_freem(m); 1264 error = EINVAL; 1265 break; 1266 } 1267 { 1268 struct in_addr laddr; /* XXX */ 1269 1270 if (nam) { 1271 laddr = inp->inp_laddr; /* XXX */ 1272 if ((so->so_state & SS_ISCONNECTED) != 0) { 1273 error = EISCONN; 1274 goto die; 1275 } 1276 error = in_pcbconnect(inp, nam, l); 1277 if (error) 1278 goto die; 1279 } else { 1280 if ((so->so_state & SS_ISCONNECTED) == 0) { 1281 error = ENOTCONN; 1282 goto die; 1283 } 1284 } 1285 error = udp_output(m, inp); 1286 m = NULL; 1287 if (nam) { 1288 in_pcbdisconnect(inp); 1289 inp->inp_laddr = laddr; /* XXX */ 1290 in_pcbstate(inp, INP_BOUND); /* XXX */ 1291 } 1292 die: 1293 if (m) 1294 m_freem(m); 1295 } 1296 break; 1297 1298 case PRU_SENSE: 1299 /* 1300 * stat: don't bother with a blocksize. 1301 */ 1302 splx(s); 1303 return (0); 1304 1305 case PRU_RCVOOB: 1306 error = EOPNOTSUPP; 1307 break; 1308 1309 case PRU_SENDOOB: 1310 m_freem(control); 1311 m_freem(m); 1312 error = EOPNOTSUPP; 1313 break; 1314 1315 case PRU_SOCKADDR: 1316 in_setsockaddr(inp, nam); 1317 break; 1318 1319 case PRU_PEERADDR: 1320 in_setpeeraddr(inp, nam); 1321 break; 1322 1323 default: 1324 panic("udp_usrreq"); 1325 } 1326 1327 release: 1328 splx(s); 1329 return (error); 1330 } 1331 1332 /* 1333 * Sysctl for udp variables. 1334 */ 1335 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1336 { 1337 1338 sysctl_createv(clog, 0, NULL, NULL, 1339 CTLFLAG_PERMANENT, 1340 CTLTYPE_NODE, "net", NULL, 1341 NULL, 0, NULL, 0, 1342 CTL_NET, CTL_EOL); 1343 sysctl_createv(clog, 0, NULL, NULL, 1344 CTLFLAG_PERMANENT, 1345 CTLTYPE_NODE, "inet", NULL, 1346 NULL, 0, NULL, 0, 1347 CTL_NET, PF_INET, CTL_EOL); 1348 sysctl_createv(clog, 0, NULL, NULL, 1349 CTLFLAG_PERMANENT, 1350 CTLTYPE_NODE, "udp", 1351 SYSCTL_DESCR("UDPv4 related settings"), 1352 NULL, 0, NULL, 0, 1353 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1354 1355 sysctl_createv(clog, 0, NULL, NULL, 1356 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1357 CTLTYPE_INT, "checksum", 1358 SYSCTL_DESCR("Compute UDP checksums"), 1359 NULL, 0, &udpcksum, 0, 1360 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1361 CTL_EOL); 1362 sysctl_createv(clog, 0, NULL, NULL, 1363 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1364 CTLTYPE_INT, "sendspace", 1365 SYSCTL_DESCR("Default UDP send buffer size"), 1366 NULL, 0, &udp_sendspace, 0, 1367 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1368 CTL_EOL); 1369 sysctl_createv(clog, 0, NULL, NULL, 1370 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1371 CTLTYPE_INT, "recvspace", 1372 SYSCTL_DESCR("Default UDP receive buffer size"), 1373 NULL, 0, &udp_recvspace, 0, 1374 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1375 CTL_EOL); 1376 sysctl_createv(clog, 0, NULL, NULL, 1377 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1378 CTLTYPE_INT, "do_loopback_cksum", 1379 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1380 NULL, 0, &udp_do_loopback_cksum, 0, 1381 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1382 CTL_EOL); 1383 sysctl_createv(clog, 0, NULL, NULL, 1384 CTLFLAG_PERMANENT, 1385 CTLTYPE_STRUCT, "pcblist", 1386 SYSCTL_DESCR("UDP protocol control block list"), 1387 sysctl_inpcblist, 0, &udbtable, 0, 1388 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1389 CTL_EOL); 1390 sysctl_createv(clog, 0, NULL, NULL, 1391 CTLFLAG_PERMANENT, 1392 CTLTYPE_STRUCT, "stats", 1393 SYSCTL_DESCR("UDP statistics"), 1394 NULL, 0, &udpstat, sizeof(udpstat), 1395 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1396 CTL_EOL); 1397 } 1398 #endif 1399 1400 #if (defined INET && defined IPSEC_NAT_T) 1401 /* 1402 * Returns: 1403 * 1 if the packet was processed 1404 * 0 if normal UDP processing should take place 1405 * -1 if an error occurent and m was freed 1406 */ 1407 static int 1408 udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src, 1409 struct socket *so) 1410 { 1411 size_t len; 1412 void *data; 1413 struct inpcb *inp; 1414 size_t skip = 0; 1415 size_t minlen; 1416 size_t iphdrlen; 1417 struct ip *ip; 1418 struct mbuf *n; 1419 struct m_tag *tag; 1420 struct udphdr *udphdr; 1421 u_int16_t sport, dport; 1422 struct mbuf *m = *mp; 1423 1424 /* 1425 * Collapse the mbuf chain if the first mbuf is too short 1426 * The longest case is: UDP + non ESP marker + ESP 1427 */ 1428 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1429 if (minlen > m->m_pkthdr.len) 1430 minlen = m->m_pkthdr.len; 1431 1432 if (m->m_len < minlen) { 1433 if ((*mp = m_pullup(m, minlen)) == NULL) { 1434 printf("udp4_espinudp: m_pullup failed\n"); 1435 return -1; 1436 } 1437 m = *mp; 1438 } 1439 1440 len = m->m_len - off; 1441 data = mtod(m, char *) + off; 1442 inp = sotoinpcb(so); 1443 1444 /* Ignore keepalive packets */ 1445 if ((len == 1) && (*(unsigned char *)data == 0xff)) { 1446 return 1; 1447 } 1448 1449 /* 1450 * Check that the payload is long enough to hold 1451 * an ESP header and compute the length of encapsulation 1452 * header to remove 1453 */ 1454 if (inp->inp_flags & INP_ESPINUDP) { 1455 u_int32_t *st = (u_int32_t *)data; 1456 1457 if ((len <= sizeof(struct esp)) || (*st == 0)) 1458 return 0; /* Normal UDP processing */ 1459 1460 skip = sizeof(struct udphdr); 1461 } 1462 1463 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1464 u_int32_t *st = (u_int32_t *)data; 1465 1466 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1467 || ((st[0] | st[1]) != 0)) 1468 return 0; /* Normal UDP processing */ 1469 1470 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1471 } 1472 1473 /* 1474 * Get the UDP ports. They are handled in network 1475 * order everywhere in IPSEC_NAT_T code. 1476 */ 1477 udphdr = (struct udphdr *)((char *)data - skip); 1478 sport = udphdr->uh_sport; 1479 dport = udphdr->uh_dport; 1480 1481 /* 1482 * Remove the UDP header (and possibly the non ESP marker) 1483 * IP header lendth is iphdrlen 1484 * Before: 1485 * <--- off ---> 1486 * +----+------+-----+ 1487 * | IP | UDP | ESP | 1488 * +----+------+-----+ 1489 * <-skip-> 1490 * After: 1491 * +----+-----+ 1492 * | IP | ESP | 1493 * +----+-----+ 1494 * <-skip-> 1495 */ 1496 iphdrlen = off - sizeof(struct udphdr); 1497 memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen); 1498 m_adj(m, skip); 1499 1500 ip = mtod(m, struct ip *); 1501 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1502 ip->ip_p = IPPROTO_ESP; 1503 1504 /* 1505 * Copy the mbuf to avoid multiple free, as both 1506 * esp4_input (which we call) and udp_input (which 1507 * called us) free the mbuf. 1508 */ 1509 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1510 printf("udp4_espinudp: m_dup failed\n"); 1511 return 0; 1512 } 1513 1514 /* 1515 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1516 * the source UDP port. This is required if we want 1517 * to select the right SPD for multiple hosts behind 1518 * same NAT 1519 */ 1520 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1521 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1522 printf("udp4_espinudp: m_tag_get failed\n"); 1523 m_freem(n); 1524 return 0; 1525 } 1526 ((u_int16_t *)(tag + 1))[0] = sport; 1527 ((u_int16_t *)(tag + 1))[1] = dport; 1528 m_tag_prepend(n, tag); 1529 1530 #ifdef FAST_IPSEC 1531 ipsec4_common_input(n, iphdrlen, IPPROTO_ESP); 1532 #else 1533 esp4_input(n, iphdrlen); 1534 #endif 1535 1536 /* We handled it, it shoudln't be handled by UDP */ 1537 return 1; 1538 } 1539 #endif 1540