1 /* $NetBSD: udp_usrreq.c,v 1.141 2005/08/10 13:06:49 yamt Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.141 2005/08/10 13:06:49 yamt Exp $"); 65 66 #include "opt_inet.h" 67 #include "opt_ipsec.h" 68 #include "opt_inet_csum.h" 69 #include "opt_ipkdb.h" 70 #include "opt_mbuftrace.h" 71 72 #include <sys/param.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/errno.h> 79 #include <sys/stat.h> 80 #include <sys/systm.h> 81 #include <sys/proc.h> 82 #include <sys/domain.h> 83 #include <sys/sysctl.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_systm.h> 90 #include <netinet/in_var.h> 91 #include <netinet/ip.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet/ip_var.h> 94 #include <netinet/ip_icmp.h> 95 #include <netinet/udp.h> 96 #include <netinet/udp_var.h> 97 98 #ifdef 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 int udp_do_loopback_cksum = 0; 150 151 struct inpcbtable udbtable; 152 struct udpstat udpstat; 153 154 #ifdef INET 155 #ifdef IPSEC_NAT_T 156 static int udp4_espinudp (struct mbuf *, int, struct sockaddr *, 157 struct socket *); 158 #endif 159 static void udp4_sendup (struct mbuf *, int, struct sockaddr *, 160 struct socket *); 161 static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, 162 struct mbuf *, int); 163 static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); 164 #endif 165 #ifdef INET6 166 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 167 struct socket *); 168 static int udp6_realinput (int, struct sockaddr_in6 *, 169 struct sockaddr_in6 *, struct mbuf *, int); 170 static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int); 171 #endif 172 #ifdef INET 173 static void udp_notify (struct inpcb *, int); 174 #endif 175 176 #ifndef UDBHASHSIZE 177 #define UDBHASHSIZE 128 178 #endif 179 int udbhashsize = UDBHASHSIZE; 180 181 #ifdef MBUFTRACE 182 struct mowner udp_mowner = { "udp" }; 183 struct mowner udp_rx_mowner = { "udp", "rx" }; 184 struct mowner udp_tx_mowner = { "udp", "tx" }; 185 #endif 186 187 #ifdef UDP_CSUM_COUNTERS 188 #include <sys/device.h> 189 190 #if defined(INET) 191 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 192 NULL, "udp", "hwcsum bad"); 193 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 194 NULL, "udp", "hwcsum ok"); 195 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 196 NULL, "udp", "hwcsum data"); 197 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 198 NULL, "udp", "swcsum"); 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 #endif /* defined(INET) */ 205 206 #if defined(INET6) 207 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 208 NULL, "udp6", "hwcsum bad"); 209 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 210 NULL, "udp6", "hwcsum ok"); 211 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 212 NULL, "udp6", "hwcsum data"); 213 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 214 NULL, "udp6", "swcsum"); 215 216 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 217 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 218 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 219 EVCNT_ATTACH_STATIC(udp6_swcsum); 220 #endif /* defined(INET6) */ 221 222 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 223 224 #else 225 226 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 227 228 #endif /* UDP_CSUM_COUNTERS */ 229 230 void 231 udp_init(void) 232 { 233 234 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 235 236 MOWNER_ATTACH(&udp_tx_mowner); 237 MOWNER_ATTACH(&udp_rx_mowner); 238 MOWNER_ATTACH(&udp_mowner); 239 } 240 241 /* 242 * Checksum extended UDP header and data. 243 */ 244 245 int 246 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 247 int iphlen, int len) 248 { 249 250 switch (af) { 251 #ifdef INET 252 case AF_INET: 253 return udp4_input_checksum(m, uh, iphlen, len); 254 #endif 255 #ifdef INET6 256 case AF_INET6: 257 return udp6_input_checksum(m, uh, iphlen, len); 258 #endif 259 } 260 #ifdef DIAGNOSTIC 261 panic("udp_input_checksum: unknown af %d", af); 262 #endif 263 /* NOTREACHED */ 264 return -1; 265 } 266 267 #ifdef INET 268 269 /* 270 * Checksum extended UDP header and data. 271 */ 272 273 static int 274 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 275 int iphlen, int len) 276 { 277 278 /* 279 * XXX it's better to record and check if this mbuf is 280 * already checked. 281 */ 282 283 if (uh->uh_sum == 0) 284 return 0; 285 286 switch (m->m_pkthdr.csum_flags & 287 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 288 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 289 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 290 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 291 goto badcsum; 292 293 case M_CSUM_UDPv4|M_CSUM_DATA: { 294 u_int32_t hw_csum = m->m_pkthdr.csum_data; 295 296 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 297 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 298 const struct ip *ip = 299 mtod(m, const struct ip *); 300 301 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 302 ip->ip_dst.s_addr, 303 htons(hw_csum + len + IPPROTO_UDP)); 304 } 305 if ((hw_csum ^ 0xffff) != 0) 306 goto badcsum; 307 break; 308 } 309 310 case M_CSUM_UDPv4: 311 /* Checksum was okay. */ 312 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 313 break; 314 315 default: 316 /* 317 * Need to compute it ourselves. Maybe skip checksum 318 * on loopback interfaces. 319 */ 320 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 321 IFF_LOOPBACK) || 322 udp_do_loopback_cksum)) { 323 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 324 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 325 goto badcsum; 326 } 327 break; 328 } 329 330 return 0; 331 332 badcsum: 333 udpstat.udps_badsum++; 334 return -1; 335 } 336 337 void 338 udp_input(struct mbuf *m, ...) 339 { 340 va_list ap; 341 struct sockaddr_in src, dst; 342 struct ip *ip; 343 struct udphdr *uh; 344 int iphlen; 345 int len; 346 int n; 347 u_int16_t ip_len; 348 349 va_start(ap, m); 350 iphlen = va_arg(ap, int); 351 (void)va_arg(ap, int); /* ignore value, advance ap */ 352 va_end(ap); 353 354 MCLAIM(m, &udp_rx_mowner); 355 udpstat.udps_ipackets++; 356 357 /* 358 * Get IP and UDP header together in first mbuf. 359 */ 360 ip = mtod(m, struct ip *); 361 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 362 if (uh == NULL) { 363 udpstat.udps_hdrops++; 364 return; 365 } 366 KASSERT(UDP_HDR_ALIGNED_P(uh)); 367 368 /* destination port of 0 is illegal, based on RFC768. */ 369 if (uh->uh_dport == 0) 370 goto bad; 371 372 /* 373 * Make mbuf data length reflect UDP length. 374 * If not enough data to reflect UDP length, drop. 375 */ 376 ip_len = ntohs(ip->ip_len); 377 len = ntohs((u_int16_t)uh->uh_ulen); 378 if (ip_len != iphlen + len) { 379 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 380 udpstat.udps_badlen++; 381 goto bad; 382 } 383 m_adj(m, iphlen + len - ip_len); 384 } 385 386 /* 387 * Checksum extended UDP header and data. 388 */ 389 if (udp4_input_checksum(m, uh, iphlen, len)) 390 goto badcsum; 391 392 /* construct source and dst sockaddrs. */ 393 bzero(&src, sizeof(src)); 394 src.sin_family = AF_INET; 395 src.sin_len = sizeof(struct sockaddr_in); 396 bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr)); 397 src.sin_port = uh->uh_sport; 398 bzero(&dst, sizeof(dst)); 399 dst.sin_family = AF_INET; 400 dst.sin_len = sizeof(struct sockaddr_in); 401 bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr)); 402 dst.sin_port = uh->uh_dport; 403 404 n = udp4_realinput(&src, &dst, m, iphlen); 405 #ifdef INET6 406 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 407 struct sockaddr_in6 src6, dst6; 408 409 bzero(&src6, sizeof(src6)); 410 src6.sin6_family = AF_INET6; 411 src6.sin6_len = sizeof(struct sockaddr_in6); 412 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 413 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 414 sizeof(ip->ip_src)); 415 src6.sin6_port = uh->uh_sport; 416 bzero(&dst6, sizeof(dst6)); 417 dst6.sin6_family = AF_INET6; 418 dst6.sin6_len = sizeof(struct sockaddr_in6); 419 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 420 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 421 sizeof(ip->ip_dst)); 422 dst6.sin6_port = uh->uh_dport; 423 424 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 425 } 426 #endif 427 428 if (n == 0) { 429 if (m->m_flags & (M_BCAST | M_MCAST)) { 430 udpstat.udps_noportbcast++; 431 goto bad; 432 } 433 udpstat.udps_noport++; 434 #ifdef IPKDB 435 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 436 m, iphlen + sizeof(struct udphdr), 437 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 438 /* 439 * It was a debugger connect packet, 440 * just drop it now 441 */ 442 goto bad; 443 } 444 #endif 445 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 446 m = NULL; 447 } 448 449 bad: 450 if (m) 451 m_freem(m); 452 return; 453 454 badcsum: 455 m_freem(m); 456 } 457 #endif 458 459 #ifdef INET6 460 static int 461 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 462 { 463 464 /* 465 * XXX it's better to record and check if this mbuf is 466 * already checked. 467 */ 468 469 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 470 goto good; 471 } 472 if (uh->uh_sum == 0) { 473 udp6stat.udp6s_nosum++; 474 goto bad; 475 } 476 477 switch (m->m_pkthdr.csum_flags & 478 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 479 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 480 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 481 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 482 udp6stat.udp6s_badsum++; 483 goto bad; 484 485 #if 0 /* notyet */ 486 case M_CSUM_UDPv6|M_CSUM_DATA: 487 #endif 488 489 case M_CSUM_UDPv6: 490 /* Checksum was okay. */ 491 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 492 break; 493 494 default: 495 /* 496 * Need to compute it ourselves. Maybe skip checksum 497 * on loopback interfaces. 498 */ 499 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 500 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 501 udp6stat.udp6s_badsum++; 502 goto bad; 503 } 504 } 505 506 good: 507 return 0; 508 bad: 509 return -1; 510 } 511 512 int 513 udp6_input(struct mbuf **mp, int *offp, int proto) 514 { 515 struct mbuf *m = *mp; 516 int off = *offp; 517 struct sockaddr_in6 src, dst; 518 struct ip6_hdr *ip6; 519 struct udphdr *uh; 520 u_int32_t plen, ulen; 521 522 ip6 = mtod(m, struct ip6_hdr *); 523 524 #if defined(NFAITH) && 0 < NFAITH 525 if (faithprefix(&ip6->ip6_dst)) { 526 /* send icmp6 host unreach? */ 527 m_freem(m); 528 return IPPROTO_DONE; 529 } 530 #endif 531 532 udp6stat.udp6s_ipackets++; 533 534 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 535 plen = m->m_pkthdr.len - off; 536 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 537 if (uh == NULL) { 538 ip6stat.ip6s_tooshort++; 539 return IPPROTO_DONE; 540 } 541 KASSERT(UDP_HDR_ALIGNED_P(uh)); 542 ulen = ntohs((u_short)uh->uh_ulen); 543 /* 544 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 545 * iff payload length > 0xffff. 546 */ 547 if (ulen == 0 && plen > 0xffff) 548 ulen = plen; 549 550 if (plen != ulen) { 551 udp6stat.udp6s_badlen++; 552 goto bad; 553 } 554 555 /* destination port of 0 is illegal, based on RFC768. */ 556 if (uh->uh_dport == 0) 557 goto bad; 558 559 /* Be proactive about malicious use of IPv4 mapped address */ 560 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 561 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 562 /* XXX stat */ 563 goto bad; 564 } 565 566 /* 567 * Checksum extended UDP header and data. Maybe skip checksum 568 * on loopback interfaces. 569 */ 570 if (udp6_input_checksum(m, uh, off, ulen)) 571 goto bad; 572 573 /* 574 * Construct source and dst sockaddrs. 575 * Note that ifindex (s6_addr16[1]) is already filled. 576 */ 577 bzero(&src, sizeof(src)); 578 src.sin6_family = AF_INET6; 579 src.sin6_len = sizeof(struct sockaddr_in6); 580 /* KAME hack: recover scopeid */ 581 (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif); 582 src.sin6_port = uh->uh_sport; 583 bzero(&dst, sizeof(dst)); 584 dst.sin6_family = AF_INET6; 585 dst.sin6_len = sizeof(struct sockaddr_in6); 586 /* KAME hack: recover scopeid */ 587 (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif); 588 dst.sin6_port = uh->uh_dport; 589 590 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 591 if (m->m_flags & M_MCAST) { 592 udp6stat.udp6s_noportmcast++; 593 goto bad; 594 } 595 udp6stat.udp6s_noport++; 596 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 597 m = NULL; 598 } 599 600 bad: 601 if (m) 602 m_freem(m); 603 return IPPROTO_DONE; 604 } 605 #endif 606 607 #ifdef INET 608 static void 609 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 610 struct sockaddr *src, struct socket *so) 611 { 612 struct mbuf *opts = NULL; 613 struct mbuf *n; 614 struct inpcb *inp = NULL; 615 616 if (!so) 617 return; 618 switch (so->so_proto->pr_domain->dom_family) { 619 case AF_INET: 620 inp = sotoinpcb(so); 621 break; 622 #ifdef INET6 623 case AF_INET6: 624 break; 625 #endif 626 default: 627 return; 628 } 629 630 #if defined(IPSEC) || defined(FAST_IPSEC) 631 /* check AH/ESP integrity. */ 632 if (so != NULL && ipsec4_in_reject_so(m, so)) { 633 ipsecstat.in_polvio++; 634 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 635 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 636 0, 0); 637 return; 638 } 639 #endif /*IPSEC*/ 640 641 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 642 if (inp && (inp->inp_flags & INP_CONTROLOPTS 643 || so->so_options & SO_TIMESTAMP)) { 644 struct ip *ip = mtod(n, struct ip *); 645 ip_savecontrol(inp, &opts, ip, n); 646 } 647 648 m_adj(n, off); 649 if (sbappendaddr(&so->so_rcv, src, n, 650 opts) == 0) { 651 m_freem(n); 652 if (opts) 653 m_freem(opts); 654 so->so_rcv.sb_overflowed++; 655 udpstat.udps_fullsock++; 656 } else 657 sorwakeup(so); 658 } 659 } 660 #endif 661 662 #ifdef INET6 663 static void 664 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 665 struct sockaddr *src, struct socket *so) 666 { 667 struct mbuf *opts = NULL; 668 struct mbuf *n; 669 struct in6pcb *in6p = NULL; 670 671 if (!so) 672 return; 673 if (so->so_proto->pr_domain->dom_family != AF_INET6) 674 return; 675 in6p = sotoin6pcb(so); 676 677 #if defined(IPSEC) || defined(FAST_IPSEC) 678 /* check AH/ESP integrity. */ 679 if (so != NULL && ipsec6_in_reject_so(m, so)) { 680 ipsec6stat.in_polvio++; 681 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 682 icmp6_error(n, ICMP6_DST_UNREACH, 683 ICMP6_DST_UNREACH_ADMIN, 0); 684 return; 685 } 686 #endif /*IPSEC*/ 687 688 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 689 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 690 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 691 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 692 ip6_savecontrol(in6p, &opts, ip6, n); 693 } 694 695 m_adj(n, off); 696 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 697 m_freem(n); 698 if (opts) 699 m_freem(opts); 700 so->so_rcv.sb_overflowed++; 701 udp6stat.udp6s_fullsock++; 702 } else 703 sorwakeup(so); 704 } 705 } 706 #endif 707 708 #ifdef INET 709 static int 710 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 711 struct mbuf *m, int off /* offset of udphdr */) 712 { 713 u_int16_t *sport, *dport; 714 int rcvcnt; 715 struct in_addr *src4, *dst4; 716 struct inpcb_hdr *inph; 717 struct inpcb *inp; 718 719 rcvcnt = 0; 720 off += sizeof(struct udphdr); /* now, offset of payload */ 721 722 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 723 goto bad; 724 725 src4 = &src->sin_addr; 726 sport = &src->sin_port; 727 dst4 = &dst->sin_addr; 728 dport = &dst->sin_port; 729 730 if (IN_MULTICAST(dst4->s_addr) || 731 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 732 /* 733 * Deliver a multicast or broadcast datagram to *all* sockets 734 * for which the local and remote addresses and ports match 735 * those of the incoming datagram. This allows more than 736 * one process to receive multi/broadcasts on the same port. 737 * (This really ought to be done for unicast datagrams as 738 * well, but that would cause problems with existing 739 * applications that open both address-specific sockets and 740 * a wildcard socket listening to the same port -- they would 741 * end up receiving duplicates of every unicast datagram. 742 * Those applications open the multiple sockets to overcome an 743 * inadequacy of the UDP socket interface, but for backwards 744 * compatibility we avoid the problem here rather than 745 * fixing the interface. Maybe 4.5BSD will remedy this?) 746 */ 747 748 /* 749 * KAME note: traditionally we dropped udpiphdr from mbuf here. 750 * we need udpiphdr for IPsec processing so we do that later. 751 */ 752 /* 753 * Locate pcb(s) for datagram. 754 */ 755 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 756 inp = (struct inpcb *)inph; 757 if (inp->inp_af != AF_INET) 758 continue; 759 760 if (inp->inp_lport != *dport) 761 continue; 762 if (!in_nullhost(inp->inp_laddr)) { 763 if (!in_hosteq(inp->inp_laddr, *dst4)) 764 continue; 765 } 766 if (!in_nullhost(inp->inp_faddr)) { 767 if (!in_hosteq(inp->inp_faddr, *src4) || 768 inp->inp_fport != *sport) 769 continue; 770 } 771 772 udp4_sendup(m, off, (struct sockaddr *)src, 773 inp->inp_socket); 774 rcvcnt++; 775 776 /* 777 * Don't look for additional matches if this one does 778 * not have either the SO_REUSEPORT or SO_REUSEADDR 779 * socket options set. This heuristic avoids searching 780 * through all pcbs in the common case of a non-shared 781 * port. It assumes that an application will never 782 * clear these options after setting them. 783 */ 784 if ((inp->inp_socket->so_options & 785 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 786 break; 787 } 788 } else { 789 /* 790 * Locate pcb for datagram. 791 */ 792 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 793 if (inp == 0) { 794 ++udpstat.udps_pcbhashmiss; 795 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 796 if (inp == 0) 797 return rcvcnt; 798 } 799 800 #ifdef IPSEC_NAT_T 801 /* Handle ESP over UDP */ 802 if (inp->inp_flags & INP_ESPINUDP_ALL) { 803 struct sockaddr *sa = (struct sockaddr *)src; 804 805 if (udp4_espinudp(m, off, sa, inp->inp_socket) != 0) { 806 rcvcnt++; 807 goto bad; 808 } 809 810 /* Normal UDP processing will take place */ 811 } 812 #endif 813 814 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 815 rcvcnt++; 816 } 817 818 bad: 819 return rcvcnt; 820 } 821 #endif 822 823 #ifdef INET6 824 static int 825 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 826 struct mbuf *m, int off) 827 { 828 u_int16_t sport, dport; 829 int rcvcnt; 830 struct in6_addr src6, dst6; 831 const struct in_addr *dst4; 832 struct inpcb_hdr *inph; 833 struct in6pcb *in6p; 834 835 rcvcnt = 0; 836 off += sizeof(struct udphdr); /* now, offset of payload */ 837 838 if (af != AF_INET && af != AF_INET6) 839 goto bad; 840 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 841 goto bad; 842 843 in6_embedscope(&src6, src, NULL, NULL); 844 sport = src->sin6_port; 845 in6_embedscope(&dst6, dst, NULL, NULL); 846 dport = dst->sin6_port; 847 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 848 849 if (IN6_IS_ADDR_MULTICAST(&dst6) || 850 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 851 /* 852 * Deliver a multicast or broadcast datagram to *all* sockets 853 * for which the local and remote addresses and ports match 854 * those of the incoming datagram. This allows more than 855 * one process to receive multi/broadcasts on the same port. 856 * (This really ought to be done for unicast datagrams as 857 * well, but that would cause problems with existing 858 * applications that open both address-specific sockets and 859 * a wildcard socket listening to the same port -- they would 860 * end up receiving duplicates of every unicast datagram. 861 * Those applications open the multiple sockets to overcome an 862 * inadequacy of the UDP socket interface, but for backwards 863 * compatibility we avoid the problem here rather than 864 * fixing the interface. Maybe 4.5BSD will remedy this?) 865 */ 866 867 /* 868 * KAME note: traditionally we dropped udpiphdr from mbuf here. 869 * we need udpiphdr for IPsec processing so we do that later. 870 */ 871 /* 872 * Locate pcb(s) for datagram. 873 */ 874 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 875 in6p = (struct in6pcb *)inph; 876 if (in6p->in6p_af != AF_INET6) 877 continue; 878 879 if (in6p->in6p_lport != dport) 880 continue; 881 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 882 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6)) 883 continue; 884 } else { 885 if (IN6_IS_ADDR_V4MAPPED(&dst6) && 886 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 887 continue; 888 } 889 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 890 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 891 &src6) || in6p->in6p_fport != sport) 892 continue; 893 } else { 894 if (IN6_IS_ADDR_V4MAPPED(&src6) && 895 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 896 continue; 897 } 898 899 udp6_sendup(m, off, (struct sockaddr *)src, 900 in6p->in6p_socket); 901 rcvcnt++; 902 903 /* 904 * Don't look for additional matches if this one does 905 * not have either the SO_REUSEPORT or SO_REUSEADDR 906 * socket options set. This heuristic avoids searching 907 * through all pcbs in the common case of a non-shared 908 * port. It assumes that an application will never 909 * clear these options after setting them. 910 */ 911 if ((in6p->in6p_socket->so_options & 912 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 913 break; 914 } 915 } else { 916 /* 917 * Locate pcb for datagram. 918 */ 919 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, 920 &dst6, dport, 0); 921 if (in6p == 0) { 922 ++udpstat.udps_pcbhashmiss; 923 in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0); 924 if (in6p == 0) 925 return rcvcnt; 926 } 927 928 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 929 rcvcnt++; 930 } 931 932 bad: 933 return rcvcnt; 934 } 935 #endif 936 937 #ifdef INET 938 /* 939 * Notify a udp user of an asynchronous error; 940 * just wake up so that he can collect error status. 941 */ 942 static void 943 udp_notify(struct inpcb *inp, int errno) 944 { 945 inp->inp_socket->so_error = errno; 946 sorwakeup(inp->inp_socket); 947 sowwakeup(inp->inp_socket); 948 } 949 950 void * 951 udp_ctlinput(int cmd, struct sockaddr *sa, void *v) 952 { 953 struct ip *ip = v; 954 struct udphdr *uh; 955 void (*notify)(struct inpcb *, int) = udp_notify; 956 int errno; 957 958 if (sa->sa_family != AF_INET 959 || sa->sa_len != sizeof(struct sockaddr_in)) 960 return NULL; 961 if ((unsigned)cmd >= PRC_NCMDS) 962 return NULL; 963 errno = inetctlerrmap[cmd]; 964 if (PRC_IS_REDIRECT(cmd)) 965 notify = in_rtchange, ip = 0; 966 else if (cmd == PRC_HOSTDEAD) 967 ip = 0; 968 else if (errno == 0) 969 return NULL; 970 if (ip) { 971 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 972 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 973 ip->ip_src, uh->uh_sport, errno, notify); 974 975 /* XXX mapped address case */ 976 } else 977 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 978 notify); 979 return NULL; 980 } 981 982 int 983 udp_ctloutput(op, so, level, optname, mp) 984 int op; 985 struct socket *so; 986 int level, optname; 987 struct mbuf **mp; 988 { 989 int s; 990 int error = 0; 991 struct mbuf *m; 992 struct inpcb *inp; 993 int family; 994 995 family = so->so_proto->pr_domain->dom_family; 996 997 s = splsoftnet(); 998 switch (family) { 999 #ifdef INET 1000 case PF_INET: 1001 if (level != IPPROTO_UDP) { 1002 error = ip_ctloutput(op, so, level, optname, mp); 1003 goto end; 1004 } 1005 break; 1006 #endif 1007 #ifdef INET6 1008 case PF_INET6: 1009 if (level != IPPROTO_UDP) { 1010 error = ip6_ctloutput(op, so, level, optname, mp); 1011 goto end; 1012 } 1013 break; 1014 #endif 1015 default: 1016 error = EAFNOSUPPORT; 1017 goto end; 1018 break; 1019 } 1020 1021 1022 switch (op) { 1023 case PRCO_SETOPT: 1024 m = *mp; 1025 inp = sotoinpcb(so); 1026 1027 switch (optname) { 1028 case UDP_ENCAP: 1029 if (m == NULL || m->m_len < sizeof (int)) { 1030 error = EINVAL; 1031 goto end; 1032 } 1033 1034 switch(*mtod(m, int *)) { 1035 #ifdef IPSEC_NAT_T 1036 case 0: 1037 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1038 break; 1039 1040 case UDP_ENCAP_ESPINUDP: 1041 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1042 inp->inp_flags |= INP_ESPINUDP; 1043 break; 1044 1045 case UDP_ENCAP_ESPINUDP_NON_IKE: 1046 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1047 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1048 break; 1049 #endif 1050 default: 1051 error = EINVAL; 1052 goto end; 1053 break; 1054 } 1055 break; 1056 1057 default: 1058 error = ENOPROTOOPT; 1059 goto end; 1060 break; 1061 } 1062 break; 1063 1064 default: 1065 error = EINVAL; 1066 goto end; 1067 break; 1068 } 1069 1070 end: 1071 splx(s); 1072 return error; 1073 } 1074 1075 1076 int 1077 udp_output(struct mbuf *m, ...) 1078 { 1079 struct inpcb *inp; 1080 struct udpiphdr *ui; 1081 struct route *ro; 1082 int len = m->m_pkthdr.len; 1083 int error = 0; 1084 va_list ap; 1085 1086 MCLAIM(m, &udp_tx_mowner); 1087 va_start(ap, m); 1088 inp = va_arg(ap, struct inpcb *); 1089 va_end(ap); 1090 1091 /* 1092 * Calculate data length and get a mbuf 1093 * for UDP and IP headers. 1094 */ 1095 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1096 if (m == 0) { 1097 error = ENOBUFS; 1098 goto release; 1099 } 1100 1101 /* 1102 * Compute the packet length of the IP header, and 1103 * punt if the length looks bogus. 1104 */ 1105 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1106 error = EMSGSIZE; 1107 goto release; 1108 } 1109 1110 /* 1111 * Fill in mbuf with extended UDP header 1112 * and addresses and length put into network format. 1113 */ 1114 ui = mtod(m, struct udpiphdr *); 1115 ui->ui_pr = IPPROTO_UDP; 1116 ui->ui_src = inp->inp_laddr; 1117 ui->ui_dst = inp->inp_faddr; 1118 ui->ui_sport = inp->inp_lport; 1119 ui->ui_dport = inp->inp_fport; 1120 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1121 1122 ro = &inp->inp_route; 1123 1124 /* 1125 * Set up checksum and output datagram. 1126 */ 1127 if (udpcksum) { 1128 /* 1129 * XXX Cache pseudo-header checksum part for 1130 * XXX "connected" UDP sockets. 1131 */ 1132 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1133 ui->ui_dst.s_addr, htons((u_int16_t)len + 1134 sizeof(struct udphdr) + IPPROTO_UDP)); 1135 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1136 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1137 } else 1138 ui->ui_sum = 0; 1139 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1140 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1141 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1142 udpstat.udps_opackets++; 1143 1144 return (ip_output(m, inp->inp_options, ro, 1145 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1146 inp->inp_moptions, inp->inp_socket)); 1147 1148 release: 1149 m_freem(m); 1150 return (error); 1151 } 1152 1153 int udp_sendspace = 9216; /* really max datagram size */ 1154 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1155 /* 40 1K datagrams */ 1156 1157 /*ARGSUSED*/ 1158 int 1159 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1160 struct mbuf *control, struct proc *p) 1161 { 1162 struct inpcb *inp; 1163 int s; 1164 int error = 0; 1165 1166 if (req == PRU_CONTROL) 1167 return (in_control(so, (long)m, (caddr_t)nam, 1168 (struct ifnet *)control, p)); 1169 1170 if (req == PRU_PURGEIF) { 1171 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1172 in_purgeif((struct ifnet *)control); 1173 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1174 return (0); 1175 } 1176 1177 s = splsoftnet(); 1178 inp = sotoinpcb(so); 1179 #ifdef DIAGNOSTIC 1180 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1181 panic("udp_usrreq: unexpected control mbuf"); 1182 #endif 1183 if (inp == 0 && req != PRU_ATTACH) { 1184 error = EINVAL; 1185 goto release; 1186 } 1187 1188 /* 1189 * Note: need to block udp_input while changing 1190 * the udp pcb queue and/or pcb addresses. 1191 */ 1192 switch (req) { 1193 1194 case PRU_ATTACH: 1195 if (inp != 0) { 1196 error = EISCONN; 1197 break; 1198 } 1199 #ifdef MBUFTRACE 1200 so->so_mowner = &udp_mowner; 1201 so->so_rcv.sb_mowner = &udp_rx_mowner; 1202 so->so_snd.sb_mowner = &udp_tx_mowner; 1203 #endif 1204 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1205 error = soreserve(so, udp_sendspace, udp_recvspace); 1206 if (error) 1207 break; 1208 } 1209 error = in_pcballoc(so, &udbtable); 1210 if (error) 1211 break; 1212 inp = sotoinpcb(so); 1213 inp->inp_ip.ip_ttl = ip_defttl; 1214 break; 1215 1216 case PRU_DETACH: 1217 in_pcbdetach(inp); 1218 break; 1219 1220 case PRU_BIND: 1221 error = in_pcbbind(inp, nam, p); 1222 break; 1223 1224 case PRU_LISTEN: 1225 error = EOPNOTSUPP; 1226 break; 1227 1228 case PRU_CONNECT: 1229 error = in_pcbconnect(inp, nam); 1230 if (error) 1231 break; 1232 soisconnected(so); 1233 break; 1234 1235 case PRU_CONNECT2: 1236 error = EOPNOTSUPP; 1237 break; 1238 1239 case PRU_DISCONNECT: 1240 /*soisdisconnected(so);*/ 1241 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1242 in_pcbdisconnect(inp); 1243 inp->inp_laddr = zeroin_addr; /* XXX */ 1244 in_pcbstate(inp, INP_BOUND); /* XXX */ 1245 break; 1246 1247 case PRU_SHUTDOWN: 1248 socantsendmore(so); 1249 break; 1250 1251 case PRU_RCVD: 1252 error = EOPNOTSUPP; 1253 break; 1254 1255 case PRU_SEND: 1256 if (control && control->m_len) { 1257 m_freem(control); 1258 m_freem(m); 1259 error = EINVAL; 1260 break; 1261 } 1262 { 1263 struct in_addr laddr; /* XXX */ 1264 1265 if (nam) { 1266 laddr = inp->inp_laddr; /* XXX */ 1267 if ((so->so_state & SS_ISCONNECTED) != 0) { 1268 error = EISCONN; 1269 goto die; 1270 } 1271 error = in_pcbconnect(inp, nam); 1272 if (error) 1273 goto die; 1274 } else { 1275 if ((so->so_state & SS_ISCONNECTED) == 0) { 1276 error = ENOTCONN; 1277 goto die; 1278 } 1279 } 1280 error = udp_output(m, inp); 1281 m = NULL; 1282 if (nam) { 1283 in_pcbdisconnect(inp); 1284 inp->inp_laddr = laddr; /* XXX */ 1285 in_pcbstate(inp, INP_BOUND); /* XXX */ 1286 } 1287 die: 1288 if (m) 1289 m_freem(m); 1290 } 1291 break; 1292 1293 case PRU_SENSE: 1294 /* 1295 * stat: don't bother with a blocksize. 1296 */ 1297 splx(s); 1298 return (0); 1299 1300 case PRU_RCVOOB: 1301 error = EOPNOTSUPP; 1302 break; 1303 1304 case PRU_SENDOOB: 1305 m_freem(control); 1306 m_freem(m); 1307 error = EOPNOTSUPP; 1308 break; 1309 1310 case PRU_SOCKADDR: 1311 in_setsockaddr(inp, nam); 1312 break; 1313 1314 case PRU_PEERADDR: 1315 in_setpeeraddr(inp, nam); 1316 break; 1317 1318 default: 1319 panic("udp_usrreq"); 1320 } 1321 1322 release: 1323 splx(s); 1324 return (error); 1325 } 1326 1327 /* 1328 * Sysctl for udp variables. 1329 */ 1330 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1331 { 1332 1333 sysctl_createv(clog, 0, NULL, NULL, 1334 CTLFLAG_PERMANENT, 1335 CTLTYPE_NODE, "net", NULL, 1336 NULL, 0, NULL, 0, 1337 CTL_NET, CTL_EOL); 1338 sysctl_createv(clog, 0, NULL, NULL, 1339 CTLFLAG_PERMANENT, 1340 CTLTYPE_NODE, "inet", NULL, 1341 NULL, 0, NULL, 0, 1342 CTL_NET, PF_INET, CTL_EOL); 1343 sysctl_createv(clog, 0, NULL, NULL, 1344 CTLFLAG_PERMANENT, 1345 CTLTYPE_NODE, "udp", 1346 SYSCTL_DESCR("UDPv4 related settings"), 1347 NULL, 0, NULL, 0, 1348 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1349 1350 sysctl_createv(clog, 0, NULL, NULL, 1351 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1352 CTLTYPE_INT, "checksum", 1353 SYSCTL_DESCR("Compute UDP checksums"), 1354 NULL, 0, &udpcksum, 0, 1355 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1356 CTL_EOL); 1357 sysctl_createv(clog, 0, NULL, NULL, 1358 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1359 CTLTYPE_INT, "sendspace", 1360 SYSCTL_DESCR("Default UDP send buffer size"), 1361 NULL, 0, &udp_sendspace, 0, 1362 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1363 CTL_EOL); 1364 sysctl_createv(clog, 0, NULL, NULL, 1365 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1366 CTLTYPE_INT, "recvspace", 1367 SYSCTL_DESCR("Default UDP receive buffer size"), 1368 NULL, 0, &udp_recvspace, 0, 1369 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1370 CTL_EOL); 1371 sysctl_createv(clog, 0, NULL, NULL, 1372 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1373 CTLTYPE_INT, "do_loopback_cksum", 1374 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1375 NULL, 0, &udp_do_loopback_cksum, 0, 1376 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1377 CTL_EOL); 1378 sysctl_createv(clog, 0, NULL, NULL, 1379 CTLFLAG_PERMANENT, 1380 CTLTYPE_STRUCT, "pcblist", 1381 SYSCTL_DESCR("UDP protocol control block list"), 1382 sysctl_inpcblist, 0, &udbtable, 0, 1383 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1384 CTL_EOL); 1385 sysctl_createv(clog, 0, NULL, NULL, 1386 CTLFLAG_PERMANENT, 1387 CTLTYPE_STRUCT, "stats", 1388 SYSCTL_DESCR("UDP statistics"), 1389 NULL, 0, &udpstat, sizeof(udpstat), 1390 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1391 CTL_EOL); 1392 } 1393 #endif 1394 1395 #if (defined INET && defined IPSEC_NAT_T) 1396 /* 1397 * Returns: 1398 * 1 if the packet was processed 1399 * 0 if normal UDP processing should take place 1400 */ 1401 static int 1402 udp4_espinudp(m, off, src, so) 1403 struct mbuf *m; 1404 int off; 1405 struct sockaddr *src; 1406 struct socket *so; 1407 { 1408 size_t len; 1409 caddr_t data; 1410 struct inpcb *inp; 1411 size_t skip = 0; 1412 size_t minlen; 1413 size_t iphdrlen; 1414 struct ip *ip; 1415 struct mbuf *n; 1416 struct m_tag *tag; 1417 struct udphdr *udphdr; 1418 u_int16_t sport, dport; 1419 1420 /* 1421 * Collapse the mbuf chain if the first mbuf is too short 1422 * The longest case is: UDP + non ESP marker + ESP 1423 */ 1424 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1425 if (minlen > m->m_pkthdr.len) 1426 minlen = m->m_pkthdr.len; 1427 1428 if (m->m_len < minlen) { 1429 if ((m = m_pullup(m, minlen)) == NULL) { 1430 printf("udp4_espinudp: m_pullup failed\n"); 1431 return 0; 1432 } 1433 } 1434 1435 len = m->m_len - off; 1436 data = mtod(m, caddr_t) + off; 1437 inp = sotoinpcb(so); 1438 1439 /* Ignore keepalive packets */ 1440 if ((len == 1) && (data[0] == '\xff')) { 1441 return 1; 1442 } 1443 1444 /* 1445 * Check that the payload is long enough to hold 1446 * an ESP header and compute the length of encapsulation 1447 * header to remove 1448 */ 1449 if (inp->inp_flags & INP_ESPINUDP) { 1450 u_int32_t *st = (u_int32_t *)data; 1451 1452 if ((len <= sizeof(struct esp)) || (*st == 0)) 1453 return 0; /* Normal UDP processing */ 1454 1455 skip = sizeof(struct udphdr); 1456 } 1457 1458 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1459 u_int64_t *st = (u_int64_t *)data; 1460 1461 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1462 || (*st != 0)) 1463 return 0; /* Normal UDP processing */ 1464 1465 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1466 } 1467 1468 /* 1469 * Get the UDP ports. They are handled in network 1470 * order everywhere in IPSEC_NAT_T code. 1471 */ 1472 udphdr = (struct udphdr *)(data - skip); 1473 sport = udphdr->uh_sport; 1474 dport = udphdr->uh_dport; 1475 1476 /* 1477 * Remove the UDP header (and possibly the non ESP marker) 1478 * IP header lendth is iphdrlen 1479 * Before: 1480 * <--- off ---> 1481 * +----+------+-----+ 1482 * | IP | UDP | ESP | 1483 * +----+------+-----+ 1484 * <-skip-> 1485 * After: 1486 * +----+-----+ 1487 * | IP | ESP | 1488 * +----+-----+ 1489 * <-skip-> 1490 */ 1491 iphdrlen = off - sizeof(struct udphdr); 1492 memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen); 1493 m_adj(m, skip); 1494 1495 ip = mtod(m, struct ip *); 1496 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1497 ip->ip_p = IPPROTO_ESP; 1498 1499 /* 1500 * Copy the mbuf to avoid multiple free, as both 1501 * esp4_input (which we call) and udp_input (which 1502 * called us) free the mbuf. 1503 */ 1504 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1505 printf("udp4_espinudp: m_dup failed\n"); 1506 return 0; 1507 } 1508 1509 /* 1510 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1511 * the source UDP port. This is required if we want 1512 * to select the right SPD for multiple hosts behind 1513 * same NAT 1514 */ 1515 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1516 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1517 printf("udp4_espinudp: m_tag_get failed\n"); 1518 m_freem(n); 1519 return 0; 1520 } 1521 ((u_int16_t *)(tag + 1))[0] = sport; 1522 ((u_int16_t *)(tag + 1))[1] = dport; 1523 m_tag_prepend(n, tag); 1524 1525 esp4_input(n, iphdrlen); 1526 1527 /* We handled it, it shoudln't be handled by UDP */ 1528 return 1; 1529 } 1530 #endif 1531