udp_usrreq.c revision 1.146
1 /* $NetBSD: udp_usrreq.c,v 1.146 2006/01/21 00:15:36 rpaulo 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 1.146 2006/01/21 00:15:36 rpaulo 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 #include <netinet6/scope6_var.h> 110 #endif 111 112 #ifndef INET6 113 /* always need ip6.h for IP6_EXTHDR_GET */ 114 #include <netinet/ip6.h> 115 #endif 116 117 #include "faith.h" 118 #if defined(NFAITH) && NFAITH > 0 119 #include <net/if_faith.h> 120 #endif 121 122 #include <machine/stdarg.h> 123 124 #ifdef FAST_IPSEC 125 #include <netipsec/ipsec.h> 126 #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */ 127 #ifdef INET6 128 #include <netipsec/ipsec6.h> 129 #endif 130 #endif /* FAST_IPSEC*/ 131 132 #ifdef IPSEC 133 #include <netinet6/ipsec.h> 134 #include <netkey/key.h> 135 #endif /*IPSEC*/ 136 137 #ifdef IPKDB 138 #include <ipkdb/ipkdb.h> 139 #endif 140 141 /* 142 * UDP protocol implementation. 143 * Per RFC 768, August, 1980. 144 */ 145 #ifndef COMPAT_42 146 int udpcksum = 1; 147 #else 148 int udpcksum = 0; /* XXX */ 149 #endif 150 int udp_do_loopback_cksum = 0; 151 152 struct inpcbtable udbtable; 153 struct udpstat udpstat; 154 155 #ifdef INET 156 #ifdef IPSEC_NAT_T 157 static int udp4_espinudp (struct mbuf **, int, struct sockaddr *, 158 struct socket *); 159 #endif 160 static void udp4_sendup (struct mbuf *, int, struct sockaddr *, 161 struct socket *); 162 static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, 163 struct mbuf **, int); 164 static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); 165 #endif 166 #ifdef INET6 167 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 168 struct socket *); 169 static int udp6_realinput (int, struct sockaddr_in6 *, 170 struct sockaddr_in6 *, struct mbuf *, int); 171 static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int); 172 #endif 173 #ifdef INET 174 static void udp_notify (struct inpcb *, int); 175 #endif 176 177 #ifndef UDBHASHSIZE 178 #define UDBHASHSIZE 128 179 #endif 180 int udbhashsize = UDBHASHSIZE; 181 182 #ifdef MBUFTRACE 183 struct mowner udp_mowner = { "udp" }; 184 struct mowner udp_rx_mowner = { "udp", "rx" }; 185 struct mowner udp_tx_mowner = { "udp", "tx" }; 186 #endif 187 188 #ifdef UDP_CSUM_COUNTERS 189 #include <sys/device.h> 190 191 #if defined(INET) 192 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 193 NULL, "udp", "hwcsum bad"); 194 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 195 NULL, "udp", "hwcsum ok"); 196 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 197 NULL, "udp", "hwcsum data"); 198 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 199 NULL, "udp", "swcsum"); 200 201 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 202 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 203 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 204 EVCNT_ATTACH_STATIC(udp_swcsum); 205 #endif /* defined(INET) */ 206 207 #if defined(INET6) 208 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 209 NULL, "udp6", "hwcsum bad"); 210 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 211 NULL, "udp6", "hwcsum ok"); 212 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 213 NULL, "udp6", "hwcsum data"); 214 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 215 NULL, "udp6", "swcsum"); 216 217 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 218 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 219 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 220 EVCNT_ATTACH_STATIC(udp6_swcsum); 221 #endif /* defined(INET6) */ 222 223 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 224 225 #else 226 227 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 228 229 #endif /* UDP_CSUM_COUNTERS */ 230 231 void 232 udp_init(void) 233 { 234 235 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 236 237 MOWNER_ATTACH(&udp_tx_mowner); 238 MOWNER_ATTACH(&udp_rx_mowner); 239 MOWNER_ATTACH(&udp_mowner); 240 } 241 242 /* 243 * Checksum extended UDP header and data. 244 */ 245 246 int 247 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 248 int iphlen, int len) 249 { 250 251 switch (af) { 252 #ifdef INET 253 case AF_INET: 254 return udp4_input_checksum(m, uh, iphlen, len); 255 #endif 256 #ifdef INET6 257 case AF_INET6: 258 return udp6_input_checksum(m, uh, iphlen, len); 259 #endif 260 } 261 #ifdef DIAGNOSTIC 262 panic("udp_input_checksum: unknown af %d", af); 263 #endif 264 /* NOTREACHED */ 265 return -1; 266 } 267 268 #ifdef INET 269 270 /* 271 * Checksum extended UDP header and data. 272 */ 273 274 static int 275 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 276 int iphlen, int len) 277 { 278 279 /* 280 * XXX it's better to record and check if this mbuf is 281 * already checked. 282 */ 283 284 if (uh->uh_sum == 0) 285 return 0; 286 287 switch (m->m_pkthdr.csum_flags & 288 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 289 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 290 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 291 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 292 goto badcsum; 293 294 case M_CSUM_UDPv4|M_CSUM_DATA: { 295 u_int32_t hw_csum = m->m_pkthdr.csum_data; 296 297 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 298 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 299 const struct ip *ip = 300 mtod(m, const struct ip *); 301 302 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 303 ip->ip_dst.s_addr, 304 htons(hw_csum + len + IPPROTO_UDP)); 305 } 306 if ((hw_csum ^ 0xffff) != 0) 307 goto badcsum; 308 break; 309 } 310 311 case M_CSUM_UDPv4: 312 /* Checksum was okay. */ 313 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 314 break; 315 316 default: 317 /* 318 * Need to compute it ourselves. Maybe skip checksum 319 * on loopback interfaces. 320 */ 321 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 322 IFF_LOOPBACK) || 323 udp_do_loopback_cksum)) { 324 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 325 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 326 goto badcsum; 327 } 328 break; 329 } 330 331 return 0; 332 333 badcsum: 334 udpstat.udps_badsum++; 335 return -1; 336 } 337 338 void 339 udp_input(struct mbuf *m, ...) 340 { 341 va_list ap; 342 struct sockaddr_in src, dst; 343 struct ip *ip; 344 struct udphdr *uh; 345 int iphlen; 346 int len; 347 int n; 348 u_int16_t ip_len; 349 350 va_start(ap, m); 351 iphlen = va_arg(ap, int); 352 (void)va_arg(ap, int); /* ignore value, advance ap */ 353 va_end(ap); 354 355 MCLAIM(m, &udp_rx_mowner); 356 udpstat.udps_ipackets++; 357 358 /* 359 * Get IP and UDP header together in first mbuf. 360 */ 361 ip = mtod(m, struct ip *); 362 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 363 if (uh == NULL) { 364 udpstat.udps_hdrops++; 365 return; 366 } 367 KASSERT(UDP_HDR_ALIGNED_P(uh)); 368 369 /* destination port of 0 is illegal, based on RFC768. */ 370 if (uh->uh_dport == 0) 371 goto bad; 372 373 /* 374 * Make mbuf data length reflect UDP length. 375 * If not enough data to reflect UDP length, drop. 376 */ 377 ip_len = ntohs(ip->ip_len); 378 len = ntohs((u_int16_t)uh->uh_ulen); 379 if (ip_len != iphlen + len) { 380 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 381 udpstat.udps_badlen++; 382 goto bad; 383 } 384 m_adj(m, iphlen + len - ip_len); 385 } 386 387 /* 388 * Checksum extended UDP header and data. 389 */ 390 if (udp4_input_checksum(m, uh, iphlen, len)) 391 goto badcsum; 392 393 /* construct source and dst sockaddrs. */ 394 bzero(&src, sizeof(src)); 395 src.sin_family = AF_INET; 396 src.sin_len = sizeof(struct sockaddr_in); 397 bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr)); 398 src.sin_port = uh->uh_sport; 399 bzero(&dst, sizeof(dst)); 400 dst.sin_family = AF_INET; 401 dst.sin_len = sizeof(struct sockaddr_in); 402 bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr)); 403 dst.sin_port = uh->uh_dport; 404 405 if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { 406 udpstat.udps_hdrops++; 407 return; 408 } 409 #ifdef INET6 410 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 411 struct sockaddr_in6 src6, dst6; 412 413 bzero(&src6, sizeof(src6)); 414 src6.sin6_family = AF_INET6; 415 src6.sin6_len = sizeof(struct sockaddr_in6); 416 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 417 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 418 sizeof(ip->ip_src)); 419 src6.sin6_port = uh->uh_sport; 420 bzero(&dst6, sizeof(dst6)); 421 dst6.sin6_family = AF_INET6; 422 dst6.sin6_len = sizeof(struct sockaddr_in6); 423 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 424 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 425 sizeof(ip->ip_dst)); 426 dst6.sin6_port = uh->uh_dport; 427 428 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 429 } 430 #endif 431 432 if (n == 0) { 433 if (m->m_flags & (M_BCAST | M_MCAST)) { 434 udpstat.udps_noportbcast++; 435 goto bad; 436 } 437 udpstat.udps_noport++; 438 #ifdef IPKDB 439 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 440 m, iphlen + sizeof(struct udphdr), 441 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 442 /* 443 * It was a debugger connect packet, 444 * just drop it now 445 */ 446 goto bad; 447 } 448 #endif 449 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 450 m = NULL; 451 } 452 453 bad: 454 if (m) 455 m_freem(m); 456 return; 457 458 badcsum: 459 m_freem(m); 460 } 461 #endif 462 463 #ifdef INET6 464 static int 465 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 466 { 467 468 /* 469 * XXX it's better to record and check if this mbuf is 470 * already checked. 471 */ 472 473 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 474 goto good; 475 } 476 if (uh->uh_sum == 0) { 477 udp6stat.udp6s_nosum++; 478 goto bad; 479 } 480 481 switch (m->m_pkthdr.csum_flags & 482 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 483 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 484 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 485 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 486 udp6stat.udp6s_badsum++; 487 goto bad; 488 489 #if 0 /* notyet */ 490 case M_CSUM_UDPv6|M_CSUM_DATA: 491 #endif 492 493 case M_CSUM_UDPv6: 494 /* Checksum was okay. */ 495 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 496 break; 497 498 default: 499 /* 500 * Need to compute it ourselves. Maybe skip checksum 501 * on loopback interfaces. 502 */ 503 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 504 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 505 udp6stat.udp6s_badsum++; 506 goto bad; 507 } 508 } 509 510 good: 511 return 0; 512 bad: 513 return -1; 514 } 515 516 int 517 udp6_input(struct mbuf **mp, int *offp, int proto) 518 { 519 struct mbuf *m = *mp; 520 int off = *offp; 521 struct sockaddr_in6 src, dst; 522 struct ip6_hdr *ip6; 523 struct udphdr *uh; 524 u_int32_t plen, ulen; 525 526 ip6 = mtod(m, struct ip6_hdr *); 527 528 #if defined(NFAITH) && 0 < NFAITH 529 if (faithprefix(&ip6->ip6_dst)) { 530 /* send icmp6 host unreach? */ 531 m_freem(m); 532 return IPPROTO_DONE; 533 } 534 #endif 535 536 udp6stat.udp6s_ipackets++; 537 538 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 539 plen = m->m_pkthdr.len - off; 540 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 541 if (uh == NULL) { 542 ip6stat.ip6s_tooshort++; 543 return IPPROTO_DONE; 544 } 545 KASSERT(UDP_HDR_ALIGNED_P(uh)); 546 ulen = ntohs((u_short)uh->uh_ulen); 547 /* 548 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 549 * iff payload length > 0xffff. 550 */ 551 if (ulen == 0 && plen > 0xffff) 552 ulen = plen; 553 554 if (plen != ulen) { 555 udp6stat.udp6s_badlen++; 556 goto bad; 557 } 558 559 /* destination port of 0 is illegal, based on RFC768. */ 560 if (uh->uh_dport == 0) 561 goto bad; 562 563 /* Be proactive about malicious use of IPv4 mapped address */ 564 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 565 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 566 /* XXX stat */ 567 goto bad; 568 } 569 570 /* 571 * Checksum extended UDP header and data. Maybe skip checksum 572 * on loopback interfaces. 573 */ 574 if (udp6_input_checksum(m, uh, off, ulen)) 575 goto bad; 576 577 /* 578 * Construct source and dst sockaddrs. 579 */ 580 bzero(&src, sizeof(src)); 581 src.sin6_family = AF_INET6; 582 src.sin6_len = sizeof(struct sockaddr_in6); 583 src.sin6_addr = ip6->ip6_src; 584 src.sin6_port = uh->uh_sport; 585 bzero(&dst, sizeof(dst)); 586 dst.sin6_family = AF_INET6; 587 dst.sin6_len = sizeof(struct sockaddr_in6); 588 dst.sin6_addr = ip6->ip6_dst; 589 dst.sin6_port = uh->uh_dport; 590 591 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 592 if (m->m_flags & M_MCAST) { 593 udp6stat.udp6s_noportmcast++; 594 goto bad; 595 } 596 udp6stat.udp6s_noport++; 597 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 598 m = NULL; 599 } 600 601 bad: 602 if (m) 603 m_freem(m); 604 return IPPROTO_DONE; 605 } 606 #endif 607 608 #ifdef INET 609 static void 610 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 611 struct sockaddr *src, struct socket *so) 612 { 613 struct mbuf *opts = NULL; 614 struct mbuf *n; 615 struct inpcb *inp = NULL; 616 617 if (!so) 618 return; 619 switch (so->so_proto->pr_domain->dom_family) { 620 case AF_INET: 621 inp = sotoinpcb(so); 622 break; 623 #ifdef INET6 624 case AF_INET6: 625 break; 626 #endif 627 default: 628 return; 629 } 630 631 #if defined(IPSEC) || defined(FAST_IPSEC) 632 /* check AH/ESP integrity. */ 633 if (so != NULL && ipsec4_in_reject_so(m, so)) { 634 ipsecstat.in_polvio++; 635 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 636 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 637 0, 0); 638 return; 639 } 640 #endif /*IPSEC*/ 641 642 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 643 if (inp && (inp->inp_flags & INP_CONTROLOPTS 644 || so->so_options & SO_TIMESTAMP)) { 645 struct ip *ip = mtod(n, struct ip *); 646 ip_savecontrol(inp, &opts, ip, n); 647 } 648 649 m_adj(n, off); 650 if (sbappendaddr(&so->so_rcv, src, n, 651 opts) == 0) { 652 m_freem(n); 653 if (opts) 654 m_freem(opts); 655 so->so_rcv.sb_overflowed++; 656 udpstat.udps_fullsock++; 657 } else 658 sorwakeup(so); 659 } 660 } 661 #endif 662 663 #ifdef INET6 664 static void 665 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 666 struct sockaddr *src, struct socket *so) 667 { 668 struct mbuf *opts = NULL; 669 struct mbuf *n; 670 struct in6pcb *in6p = NULL; 671 672 if (!so) 673 return; 674 if (so->so_proto->pr_domain->dom_family != AF_INET6) 675 return; 676 in6p = sotoin6pcb(so); 677 678 #if defined(IPSEC) || defined(FAST_IPSEC) 679 /* check AH/ESP integrity. */ 680 if (so != NULL && ipsec6_in_reject_so(m, so)) { 681 ipsec6stat.in_polvio++; 682 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 683 icmp6_error(n, ICMP6_DST_UNREACH, 684 ICMP6_DST_UNREACH_ADMIN, 0); 685 return; 686 } 687 #endif /*IPSEC*/ 688 689 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 690 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 691 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 692 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 693 ip6_savecontrol(in6p, &opts, ip6, n); 694 } 695 696 m_adj(n, off); 697 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 698 m_freem(n); 699 if (opts) 700 m_freem(opts); 701 so->so_rcv.sb_overflowed++; 702 udp6stat.udp6s_fullsock++; 703 } else 704 sorwakeup(so); 705 } 706 } 707 #endif 708 709 #ifdef INET 710 static int 711 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 712 struct mbuf **mp, int off /* offset of udphdr */) 713 { 714 u_int16_t *sport, *dport; 715 int rcvcnt; 716 struct in_addr *src4, *dst4; 717 struct inpcb_hdr *inph; 718 struct inpcb *inp; 719 struct mbuf *m = *mp; 720 721 rcvcnt = 0; 722 off += sizeof(struct udphdr); /* now, offset of payload */ 723 724 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 725 goto bad; 726 727 src4 = &src->sin_addr; 728 sport = &src->sin_port; 729 dst4 = &dst->sin_addr; 730 dport = &dst->sin_port; 731 732 if (IN_MULTICAST(dst4->s_addr) || 733 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 734 /* 735 * Deliver a multicast or broadcast datagram to *all* sockets 736 * for which the local and remote addresses and ports match 737 * those of the incoming datagram. This allows more than 738 * one process to receive multi/broadcasts on the same port. 739 * (This really ought to be done for unicast datagrams as 740 * well, but that would cause problems with existing 741 * applications that open both address-specific sockets and 742 * a wildcard socket listening to the same port -- they would 743 * end up receiving duplicates of every unicast datagram. 744 * Those applications open the multiple sockets to overcome an 745 * inadequacy of the UDP socket interface, but for backwards 746 * compatibility we avoid the problem here rather than 747 * fixing the interface. Maybe 4.5BSD will remedy this?) 748 */ 749 750 /* 751 * KAME note: traditionally we dropped udpiphdr from mbuf here. 752 * we need udpiphdr for IPsec processing so we do that later. 753 */ 754 /* 755 * Locate pcb(s) for datagram. 756 */ 757 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 758 inp = (struct inpcb *)inph; 759 if (inp->inp_af != AF_INET) 760 continue; 761 762 if (inp->inp_lport != *dport) 763 continue; 764 if (!in_nullhost(inp->inp_laddr)) { 765 if (!in_hosteq(inp->inp_laddr, *dst4)) 766 continue; 767 } 768 if (!in_nullhost(inp->inp_faddr)) { 769 if (!in_hosteq(inp->inp_faddr, *src4) || 770 inp->inp_fport != *sport) 771 continue; 772 } 773 774 udp4_sendup(m, off, (struct sockaddr *)src, 775 inp->inp_socket); 776 rcvcnt++; 777 778 /* 779 * Don't look for additional matches if this one does 780 * not have either the SO_REUSEPORT or SO_REUSEADDR 781 * socket options set. This heuristic avoids searching 782 * through all pcbs in the common case of a non-shared 783 * port. It assumes that an application will never 784 * clear these options after setting them. 785 */ 786 if ((inp->inp_socket->so_options & 787 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 788 break; 789 } 790 } else { 791 /* 792 * Locate pcb for datagram. 793 */ 794 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 795 if (inp == 0) { 796 ++udpstat.udps_pcbhashmiss; 797 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 798 if (inp == 0) 799 return rcvcnt; 800 } 801 802 #ifdef IPSEC_NAT_T 803 /* Handle ESP over UDP */ 804 if (inp->inp_flags & INP_ESPINUDP_ALL) { 805 struct sockaddr *sa = (struct sockaddr *)src; 806 807 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 808 case -1: /* Error, m was freeed */ 809 rcvcnt = -1; 810 goto bad; 811 break; 812 813 case 1: /* ESP over UDP */ 814 rcvcnt++; 815 goto bad; 816 break; 817 818 case 0: /* plain UDP */ 819 default: /* Unexpected */ 820 /* 821 * Normal UDP processing will take place 822 * m may have changed. 823 */ 824 m = *mp; 825 break; 826 } 827 } 828 #endif 829 830 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 831 rcvcnt++; 832 } 833 834 bad: 835 return rcvcnt; 836 } 837 #endif 838 839 #ifdef INET6 840 static int 841 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 842 struct mbuf *m, int off) 843 { 844 u_int16_t sport, dport; 845 int rcvcnt; 846 struct in6_addr src6, *dst6; 847 const struct in_addr *dst4; 848 struct inpcb_hdr *inph; 849 struct in6pcb *in6p; 850 851 rcvcnt = 0; 852 off += sizeof(struct udphdr); /* now, offset of payload */ 853 854 if (af != AF_INET && af != AF_INET6) 855 goto bad; 856 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 857 goto bad; 858 859 src6 = src->sin6_addr; 860 if (sa6_recoverscope(src) != 0) { 861 /* XXX: should be impossible. */ 862 goto bad; 863 } 864 sport = src->sin6_port; 865 866 dport = dst->sin6_port; 867 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 868 dst6 = &dst->sin6_addr; 869 870 if (IN6_IS_ADDR_MULTICAST(dst6) || 871 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 872 /* 873 * Deliver a multicast or broadcast datagram to *all* sockets 874 * for which the local and remote addresses and ports match 875 * those of the incoming datagram. This allows more than 876 * one process to receive multi/broadcasts on the same port. 877 * (This really ought to be done for unicast datagrams as 878 * well, but that would cause problems with existing 879 * applications that open both address-specific sockets and 880 * a wildcard socket listening to the same port -- they would 881 * end up receiving duplicates of every unicast datagram. 882 * Those applications open the multiple sockets to overcome an 883 * inadequacy of the UDP socket interface, but for backwards 884 * compatibility we avoid the problem here rather than 885 * fixing the interface. Maybe 4.5BSD will remedy this?) 886 */ 887 888 /* 889 * KAME note: traditionally we dropped udpiphdr from mbuf here. 890 * we need udpiphdr for IPsec processing so we do that later. 891 */ 892 /* 893 * Locate pcb(s) for datagram. 894 */ 895 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 896 in6p = (struct in6pcb *)inph; 897 if (in6p->in6p_af != AF_INET6) 898 continue; 899 900 if (in6p->in6p_lport != dport) 901 continue; 902 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 903 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 904 dst6)) 905 continue; 906 } else { 907 if (IN6_IS_ADDR_V4MAPPED(dst6) && 908 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 909 continue; 910 } 911 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 912 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 913 &src6) || in6p->in6p_fport != sport) 914 continue; 915 } else { 916 if (IN6_IS_ADDR_V4MAPPED(&src6) && 917 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 918 continue; 919 } 920 921 udp6_sendup(m, off, (struct sockaddr *)src, 922 in6p->in6p_socket); 923 rcvcnt++; 924 925 /* 926 * Don't look for additional matches if this one does 927 * not have either the SO_REUSEPORT or SO_REUSEADDR 928 * socket options set. This heuristic avoids searching 929 * through all pcbs in the common case of a non-shared 930 * port. It assumes that an application will never 931 * clear these options after setting them. 932 */ 933 if ((in6p->in6p_socket->so_options & 934 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 935 break; 936 } 937 } else { 938 /* 939 * Locate pcb for datagram. 940 */ 941 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 942 dport, 0); 943 if (in6p == 0) { 944 ++udpstat.udps_pcbhashmiss; 945 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 946 if (in6p == 0) 947 return rcvcnt; 948 } 949 950 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 951 rcvcnt++; 952 } 953 954 bad: 955 return rcvcnt; 956 } 957 #endif 958 959 #ifdef INET 960 /* 961 * Notify a udp user of an asynchronous error; 962 * just wake up so that he can collect error status. 963 */ 964 static void 965 udp_notify(struct inpcb *inp, int errno) 966 { 967 inp->inp_socket->so_error = errno; 968 sorwakeup(inp->inp_socket); 969 sowwakeup(inp->inp_socket); 970 } 971 972 void * 973 udp_ctlinput(int cmd, struct sockaddr *sa, void *v) 974 { 975 struct ip *ip = v; 976 struct udphdr *uh; 977 void (*notify)(struct inpcb *, int) = udp_notify; 978 int errno; 979 980 if (sa->sa_family != AF_INET 981 || sa->sa_len != sizeof(struct sockaddr_in)) 982 return NULL; 983 if ((unsigned)cmd >= PRC_NCMDS) 984 return NULL; 985 errno = inetctlerrmap[cmd]; 986 if (PRC_IS_REDIRECT(cmd)) 987 notify = in_rtchange, ip = 0; 988 else if (cmd == PRC_HOSTDEAD) 989 ip = 0; 990 else if (errno == 0) 991 return NULL; 992 if (ip) { 993 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 994 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 995 ip->ip_src, uh->uh_sport, errno, notify); 996 997 /* XXX mapped address case */ 998 } else 999 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 1000 notify); 1001 return NULL; 1002 } 1003 1004 int 1005 udp_ctloutput(op, so, level, optname, mp) 1006 int op; 1007 struct socket *so; 1008 int level, optname; 1009 struct mbuf **mp; 1010 { 1011 int s; 1012 int error = 0; 1013 struct mbuf *m; 1014 struct inpcb *inp; 1015 int family; 1016 1017 family = so->so_proto->pr_domain->dom_family; 1018 1019 s = splsoftnet(); 1020 switch (family) { 1021 #ifdef INET 1022 case PF_INET: 1023 if (level != IPPROTO_UDP) { 1024 error = ip_ctloutput(op, so, level, optname, mp); 1025 goto end; 1026 } 1027 break; 1028 #endif 1029 #ifdef INET6 1030 case PF_INET6: 1031 if (level != IPPROTO_UDP) { 1032 error = ip6_ctloutput(op, so, level, optname, mp); 1033 goto end; 1034 } 1035 break; 1036 #endif 1037 default: 1038 error = EAFNOSUPPORT; 1039 goto end; 1040 break; 1041 } 1042 1043 1044 switch (op) { 1045 case PRCO_SETOPT: 1046 m = *mp; 1047 inp = sotoinpcb(so); 1048 1049 switch (optname) { 1050 case UDP_ENCAP: 1051 if (m == NULL || m->m_len < sizeof (int)) { 1052 error = EINVAL; 1053 goto end; 1054 } 1055 1056 switch(*mtod(m, int *)) { 1057 #ifdef IPSEC_NAT_T 1058 case 0: 1059 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1060 break; 1061 1062 case UDP_ENCAP_ESPINUDP: 1063 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1064 inp->inp_flags |= INP_ESPINUDP; 1065 break; 1066 1067 case UDP_ENCAP_ESPINUDP_NON_IKE: 1068 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1069 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1070 break; 1071 #endif 1072 default: 1073 error = EINVAL; 1074 goto end; 1075 break; 1076 } 1077 break; 1078 1079 default: 1080 error = ENOPROTOOPT; 1081 goto end; 1082 break; 1083 } 1084 break; 1085 1086 default: 1087 error = EINVAL; 1088 goto end; 1089 break; 1090 } 1091 1092 end: 1093 splx(s); 1094 return error; 1095 } 1096 1097 1098 int 1099 udp_output(struct mbuf *m, ...) 1100 { 1101 struct inpcb *inp; 1102 struct udpiphdr *ui; 1103 struct route *ro; 1104 int len = m->m_pkthdr.len; 1105 int error = 0; 1106 va_list ap; 1107 1108 MCLAIM(m, &udp_tx_mowner); 1109 va_start(ap, m); 1110 inp = va_arg(ap, struct inpcb *); 1111 va_end(ap); 1112 1113 /* 1114 * Calculate data length and get a mbuf 1115 * for UDP and IP headers. 1116 */ 1117 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1118 if (m == 0) { 1119 error = ENOBUFS; 1120 goto release; 1121 } 1122 1123 /* 1124 * Compute the packet length of the IP header, and 1125 * punt if the length looks bogus. 1126 */ 1127 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1128 error = EMSGSIZE; 1129 goto release; 1130 } 1131 1132 /* 1133 * Fill in mbuf with extended UDP header 1134 * and addresses and length put into network format. 1135 */ 1136 ui = mtod(m, struct udpiphdr *); 1137 ui->ui_pr = IPPROTO_UDP; 1138 ui->ui_src = inp->inp_laddr; 1139 ui->ui_dst = inp->inp_faddr; 1140 ui->ui_sport = inp->inp_lport; 1141 ui->ui_dport = inp->inp_fport; 1142 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1143 1144 ro = &inp->inp_route; 1145 1146 /* 1147 * Set up checksum and output datagram. 1148 */ 1149 if (udpcksum) { 1150 /* 1151 * XXX Cache pseudo-header checksum part for 1152 * XXX "connected" UDP sockets. 1153 */ 1154 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1155 ui->ui_dst.s_addr, htons((u_int16_t)len + 1156 sizeof(struct udphdr) + IPPROTO_UDP)); 1157 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1158 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1159 } else 1160 ui->ui_sum = 0; 1161 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1162 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1163 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1164 udpstat.udps_opackets++; 1165 1166 return (ip_output(m, inp->inp_options, ro, 1167 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1168 inp->inp_moptions, inp->inp_socket)); 1169 1170 release: 1171 m_freem(m); 1172 return (error); 1173 } 1174 1175 int udp_sendspace = 9216; /* really max datagram size */ 1176 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1177 /* 40 1K datagrams */ 1178 1179 /*ARGSUSED*/ 1180 int 1181 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1182 struct mbuf *control, struct lwp *l) 1183 { 1184 struct inpcb *inp; 1185 struct proc *p; 1186 int s; 1187 int error = 0; 1188 1189 p = l ? l->l_proc : NULL; 1190 if (req == PRU_CONTROL) 1191 return (in_control(so, (long)m, (caddr_t)nam, 1192 (struct ifnet *)control, p)); 1193 1194 if (req == PRU_PURGEIF) { 1195 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1196 in_purgeif((struct ifnet *)control); 1197 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1198 return (0); 1199 } 1200 1201 s = splsoftnet(); 1202 inp = sotoinpcb(so); 1203 #ifdef DIAGNOSTIC 1204 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1205 panic("udp_usrreq: unexpected control mbuf"); 1206 #endif 1207 if (inp == 0 && req != PRU_ATTACH) { 1208 error = EINVAL; 1209 goto release; 1210 } 1211 1212 /* 1213 * Note: need to block udp_input while changing 1214 * the udp pcb queue and/or pcb addresses. 1215 */ 1216 switch (req) { 1217 1218 case PRU_ATTACH: 1219 if (inp != 0) { 1220 error = EISCONN; 1221 break; 1222 } 1223 #ifdef MBUFTRACE 1224 so->so_mowner = &udp_mowner; 1225 so->so_rcv.sb_mowner = &udp_rx_mowner; 1226 so->so_snd.sb_mowner = &udp_tx_mowner; 1227 #endif 1228 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1229 error = soreserve(so, udp_sendspace, udp_recvspace); 1230 if (error) 1231 break; 1232 } 1233 error = in_pcballoc(so, &udbtable); 1234 if (error) 1235 break; 1236 inp = sotoinpcb(so); 1237 inp->inp_ip.ip_ttl = ip_defttl; 1238 break; 1239 1240 case PRU_DETACH: 1241 in_pcbdetach(inp); 1242 break; 1243 1244 case PRU_BIND: 1245 error = in_pcbbind(inp, nam, p); 1246 break; 1247 1248 case PRU_LISTEN: 1249 error = EOPNOTSUPP; 1250 break; 1251 1252 case PRU_CONNECT: 1253 error = in_pcbconnect(inp, nam, p); 1254 if (error) 1255 break; 1256 soisconnected(so); 1257 break; 1258 1259 case PRU_CONNECT2: 1260 error = EOPNOTSUPP; 1261 break; 1262 1263 case PRU_DISCONNECT: 1264 /*soisdisconnected(so);*/ 1265 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1266 in_pcbdisconnect(inp); 1267 inp->inp_laddr = zeroin_addr; /* XXX */ 1268 in_pcbstate(inp, INP_BOUND); /* XXX */ 1269 break; 1270 1271 case PRU_SHUTDOWN: 1272 socantsendmore(so); 1273 break; 1274 1275 case PRU_RCVD: 1276 error = EOPNOTSUPP; 1277 break; 1278 1279 case PRU_SEND: 1280 if (control && control->m_len) { 1281 m_freem(control); 1282 m_freem(m); 1283 error = EINVAL; 1284 break; 1285 } 1286 { 1287 struct in_addr laddr; /* XXX */ 1288 1289 if (nam) { 1290 laddr = inp->inp_laddr; /* XXX */ 1291 if ((so->so_state & SS_ISCONNECTED) != 0) { 1292 error = EISCONN; 1293 goto die; 1294 } 1295 error = in_pcbconnect(inp, nam, p); 1296 if (error) 1297 goto die; 1298 } else { 1299 if ((so->so_state & SS_ISCONNECTED) == 0) { 1300 error = ENOTCONN; 1301 goto die; 1302 } 1303 } 1304 error = udp_output(m, inp); 1305 m = NULL; 1306 if (nam) { 1307 in_pcbdisconnect(inp); 1308 inp->inp_laddr = laddr; /* XXX */ 1309 in_pcbstate(inp, INP_BOUND); /* XXX */ 1310 } 1311 die: 1312 if (m) 1313 m_freem(m); 1314 } 1315 break; 1316 1317 case PRU_SENSE: 1318 /* 1319 * stat: don't bother with a blocksize. 1320 */ 1321 splx(s); 1322 return (0); 1323 1324 case PRU_RCVOOB: 1325 error = EOPNOTSUPP; 1326 break; 1327 1328 case PRU_SENDOOB: 1329 m_freem(control); 1330 m_freem(m); 1331 error = EOPNOTSUPP; 1332 break; 1333 1334 case PRU_SOCKADDR: 1335 in_setsockaddr(inp, nam); 1336 break; 1337 1338 case PRU_PEERADDR: 1339 in_setpeeraddr(inp, nam); 1340 break; 1341 1342 default: 1343 panic("udp_usrreq"); 1344 } 1345 1346 release: 1347 splx(s); 1348 return (error); 1349 } 1350 1351 /* 1352 * Sysctl for udp variables. 1353 */ 1354 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1355 { 1356 1357 sysctl_createv(clog, 0, NULL, NULL, 1358 CTLFLAG_PERMANENT, 1359 CTLTYPE_NODE, "net", NULL, 1360 NULL, 0, NULL, 0, 1361 CTL_NET, CTL_EOL); 1362 sysctl_createv(clog, 0, NULL, NULL, 1363 CTLFLAG_PERMANENT, 1364 CTLTYPE_NODE, "inet", NULL, 1365 NULL, 0, NULL, 0, 1366 CTL_NET, PF_INET, CTL_EOL); 1367 sysctl_createv(clog, 0, NULL, NULL, 1368 CTLFLAG_PERMANENT, 1369 CTLTYPE_NODE, "udp", 1370 SYSCTL_DESCR("UDPv4 related settings"), 1371 NULL, 0, NULL, 0, 1372 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1373 1374 sysctl_createv(clog, 0, NULL, NULL, 1375 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1376 CTLTYPE_INT, "checksum", 1377 SYSCTL_DESCR("Compute UDP checksums"), 1378 NULL, 0, &udpcksum, 0, 1379 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1380 CTL_EOL); 1381 sysctl_createv(clog, 0, NULL, NULL, 1382 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1383 CTLTYPE_INT, "sendspace", 1384 SYSCTL_DESCR("Default UDP send buffer size"), 1385 NULL, 0, &udp_sendspace, 0, 1386 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1387 CTL_EOL); 1388 sysctl_createv(clog, 0, NULL, NULL, 1389 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1390 CTLTYPE_INT, "recvspace", 1391 SYSCTL_DESCR("Default UDP receive buffer size"), 1392 NULL, 0, &udp_recvspace, 0, 1393 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1394 CTL_EOL); 1395 sysctl_createv(clog, 0, NULL, NULL, 1396 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1397 CTLTYPE_INT, "do_loopback_cksum", 1398 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1399 NULL, 0, &udp_do_loopback_cksum, 0, 1400 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1401 CTL_EOL); 1402 sysctl_createv(clog, 0, NULL, NULL, 1403 CTLFLAG_PERMANENT, 1404 CTLTYPE_STRUCT, "pcblist", 1405 SYSCTL_DESCR("UDP protocol control block list"), 1406 sysctl_inpcblist, 0, &udbtable, 0, 1407 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1408 CTL_EOL); 1409 sysctl_createv(clog, 0, NULL, NULL, 1410 CTLFLAG_PERMANENT, 1411 CTLTYPE_STRUCT, "stats", 1412 SYSCTL_DESCR("UDP statistics"), 1413 NULL, 0, &udpstat, sizeof(udpstat), 1414 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1415 CTL_EOL); 1416 } 1417 #endif 1418 1419 #if (defined INET && defined IPSEC_NAT_T) 1420 /* 1421 * Returns: 1422 * 1 if the packet was processed 1423 * 0 if normal UDP processing should take place 1424 * -1 if an error occurent and m was freed 1425 */ 1426 static int 1427 udp4_espinudp(mp, off, src, so) 1428 struct mbuf **mp; 1429 int off; 1430 struct sockaddr *src; 1431 struct socket *so; 1432 { 1433 size_t len; 1434 caddr_t data; 1435 struct inpcb *inp; 1436 size_t skip = 0; 1437 size_t minlen; 1438 size_t iphdrlen; 1439 struct ip *ip; 1440 struct mbuf *n; 1441 struct m_tag *tag; 1442 struct udphdr *udphdr; 1443 u_int16_t sport, dport; 1444 struct mbuf *m = *mp; 1445 1446 /* 1447 * Collapse the mbuf chain if the first mbuf is too short 1448 * The longest case is: UDP + non ESP marker + ESP 1449 */ 1450 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1451 if (minlen > m->m_pkthdr.len) 1452 minlen = m->m_pkthdr.len; 1453 1454 if (m->m_len < minlen) { 1455 if ((*mp = m_pullup(m, minlen)) == NULL) { 1456 printf("udp4_espinudp: m_pullup failed\n"); 1457 return -1; 1458 } 1459 m = *mp; 1460 } 1461 1462 len = m->m_len - off; 1463 data = mtod(m, caddr_t) + off; 1464 inp = sotoinpcb(so); 1465 1466 /* Ignore keepalive packets */ 1467 if ((len == 1) && (data[0] == '\xff')) { 1468 return 1; 1469 } 1470 1471 /* 1472 * Check that the payload is long enough to hold 1473 * an ESP header and compute the length of encapsulation 1474 * header to remove 1475 */ 1476 if (inp->inp_flags & INP_ESPINUDP) { 1477 u_int32_t *st = (u_int32_t *)data; 1478 1479 if ((len <= sizeof(struct esp)) || (*st == 0)) 1480 return 0; /* Normal UDP processing */ 1481 1482 skip = sizeof(struct udphdr); 1483 } 1484 1485 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1486 u_int32_t *st = (u_int32_t *)data; 1487 1488 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1489 || ((st[0] | st[1]) != 0)) 1490 return 0; /* Normal UDP processing */ 1491 1492 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1493 } 1494 1495 /* 1496 * Get the UDP ports. They are handled in network 1497 * order everywhere in IPSEC_NAT_T code. 1498 */ 1499 udphdr = (struct udphdr *)(data - skip); 1500 sport = udphdr->uh_sport; 1501 dport = udphdr->uh_dport; 1502 1503 /* 1504 * Remove the UDP header (and possibly the non ESP marker) 1505 * IP header lendth is iphdrlen 1506 * Before: 1507 * <--- off ---> 1508 * +----+------+-----+ 1509 * | IP | UDP | ESP | 1510 * +----+------+-----+ 1511 * <-skip-> 1512 * After: 1513 * +----+-----+ 1514 * | IP | ESP | 1515 * +----+-----+ 1516 * <-skip-> 1517 */ 1518 iphdrlen = off - sizeof(struct udphdr); 1519 memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen); 1520 m_adj(m, skip); 1521 1522 ip = mtod(m, struct ip *); 1523 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1524 ip->ip_p = IPPROTO_ESP; 1525 1526 /* 1527 * Copy the mbuf to avoid multiple free, as both 1528 * esp4_input (which we call) and udp_input (which 1529 * called us) free the mbuf. 1530 */ 1531 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1532 printf("udp4_espinudp: m_dup failed\n"); 1533 return 0; 1534 } 1535 1536 /* 1537 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1538 * the source UDP port. This is required if we want 1539 * to select the right SPD for multiple hosts behind 1540 * same NAT 1541 */ 1542 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1543 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1544 printf("udp4_espinudp: m_tag_get failed\n"); 1545 m_freem(n); 1546 return 0; 1547 } 1548 ((u_int16_t *)(tag + 1))[0] = sport; 1549 ((u_int16_t *)(tag + 1))[1] = dport; 1550 m_tag_prepend(n, tag); 1551 1552 esp4_input(n, iphdrlen); 1553 1554 /* We handled it, it shoudln't be handled by UDP */ 1555 return 1; 1556 } 1557 #endif 1558
Indexes created Wed Sep 24 15:09:51 GMT 2025