udp_usrreq.c revision 1.146.2.2
1 /* $NetBSD: udp_usrreq.c,v 1.146.2.2 2006/02/07 04:51:49 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 1.146.2.2 2006/02/07 04:51:49 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/udp6_var.h> 108 #include <netinet6/scope6_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 if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { 405 udpstat.udps_hdrops++; 406 return; 407 } 408 #ifdef INET6 409 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 410 struct sockaddr_in6 src6, dst6; 411 412 bzero(&src6, sizeof(src6)); 413 src6.sin6_family = AF_INET6; 414 src6.sin6_len = sizeof(struct sockaddr_in6); 415 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 416 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 417 sizeof(ip->ip_src)); 418 src6.sin6_port = uh->uh_sport; 419 bzero(&dst6, sizeof(dst6)); 420 dst6.sin6_family = AF_INET6; 421 dst6.sin6_len = sizeof(struct sockaddr_in6); 422 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 423 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 424 sizeof(ip->ip_dst)); 425 dst6.sin6_port = uh->uh_dport; 426 427 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 428 } 429 #endif 430 431 if (n == 0) { 432 if (m->m_flags & (M_BCAST | M_MCAST)) { 433 udpstat.udps_noportbcast++; 434 goto bad; 435 } 436 udpstat.udps_noport++; 437 #ifdef IPKDB 438 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 439 m, iphlen + sizeof(struct udphdr), 440 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 441 /* 442 * It was a debugger connect packet, 443 * just drop it now 444 */ 445 goto bad; 446 } 447 #endif 448 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 449 m = NULL; 450 } 451 452 bad: 453 if (m) 454 m_freem(m); 455 return; 456 457 badcsum: 458 m_freem(m); 459 } 460 #endif 461 462 #ifdef INET6 463 static int 464 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 465 { 466 467 /* 468 * XXX it's better to record and check if this mbuf is 469 * already checked. 470 */ 471 472 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 473 goto good; 474 } 475 if (uh->uh_sum == 0) { 476 udp6stat.udp6s_nosum++; 477 goto bad; 478 } 479 480 switch (m->m_pkthdr.csum_flags & 481 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 482 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 483 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 484 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 485 udp6stat.udp6s_badsum++; 486 goto bad; 487 488 #if 0 /* notyet */ 489 case M_CSUM_UDPv6|M_CSUM_DATA: 490 #endif 491 492 case M_CSUM_UDPv6: 493 /* Checksum was okay. */ 494 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 495 break; 496 497 default: 498 /* 499 * Need to compute it ourselves. Maybe skip checksum 500 * on loopback interfaces. 501 */ 502 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 503 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 504 udp6stat.udp6s_badsum++; 505 goto bad; 506 } 507 } 508 509 good: 510 return 0; 511 bad: 512 return -1; 513 } 514 515 int 516 udp6_input(struct mbuf **mp, int *offp, int proto) 517 { 518 struct mbuf *m = *mp; 519 int off = *offp; 520 struct sockaddr_in6 src, dst; 521 struct ip6_hdr *ip6; 522 struct udphdr *uh; 523 u_int32_t plen, ulen; 524 525 ip6 = mtod(m, struct ip6_hdr *); 526 527 #if defined(NFAITH) && 0 < NFAITH 528 if (faithprefix(&ip6->ip6_dst)) { 529 /* send icmp6 host unreach? */ 530 m_freem(m); 531 return IPPROTO_DONE; 532 } 533 #endif 534 535 udp6stat.udp6s_ipackets++; 536 537 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 538 plen = m->m_pkthdr.len - off; 539 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 540 if (uh == NULL) { 541 ip6stat.ip6s_tooshort++; 542 return IPPROTO_DONE; 543 } 544 KASSERT(UDP_HDR_ALIGNED_P(uh)); 545 ulen = ntohs((u_short)uh->uh_ulen); 546 /* 547 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 548 * iff payload length > 0xffff. 549 */ 550 if (ulen == 0 && plen > 0xffff) 551 ulen = plen; 552 553 if (plen != ulen) { 554 udp6stat.udp6s_badlen++; 555 goto bad; 556 } 557 558 /* destination port of 0 is illegal, based on RFC768. */ 559 if (uh->uh_dport == 0) 560 goto bad; 561 562 /* Be proactive about malicious use of IPv4 mapped address */ 563 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 564 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 565 /* XXX stat */ 566 goto bad; 567 } 568 569 /* 570 * Checksum extended UDP header and data. Maybe skip checksum 571 * on loopback interfaces. 572 */ 573 if (udp6_input_checksum(m, uh, off, ulen)) 574 goto bad; 575 576 /* 577 * Construct source and dst sockaddrs. 578 */ 579 bzero(&src, sizeof(src)); 580 src.sin6_family = AF_INET6; 581 src.sin6_len = sizeof(struct sockaddr_in6); 582 src.sin6_addr = ip6->ip6_src; 583 src.sin6_port = uh->uh_sport; 584 bzero(&dst, sizeof(dst)); 585 dst.sin6_family = AF_INET6; 586 dst.sin6_len = sizeof(struct sockaddr_in6); 587 dst.sin6_addr = ip6->ip6_dst; 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 **mp, int off /* offset of udphdr */) 712 { 713 u_int16_t *sport, *dport; 714 int rcvcnt; 715 struct in_addr *src4, *dst4; 716 struct inpcb *inp; 717 struct mbuf *m = *mp; 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(inp, &udbtable.inpt_queue, inp_queue) { 756 if (inp->inp_af != AF_INET) 757 continue; 758 759 if (inp->inp_lport != *dport) 760 continue; 761 if (!in_nullhost(inp->inp_laddr)) { 762 if (!in_hosteq(inp->inp_laddr, *dst4)) 763 continue; 764 } 765 if (!in_nullhost(inp->inp_faddr)) { 766 if (!in_hosteq(inp->inp_faddr, *src4) || 767 inp->inp_fport != *sport) 768 continue; 769 } 770 771 udp4_sendup(m, off, (struct sockaddr *)src, 772 inp->inp_socket); 773 rcvcnt++; 774 775 /* 776 * Don't look for additional matches if this one does 777 * not have either the SO_REUSEPORT or SO_REUSEADDR 778 * socket options set. This heuristic avoids searching 779 * through all pcbs in the common case of a non-shared 780 * port. It assumes that an application will never 781 * clear these options after setting them. 782 */ 783 if ((inp->inp_socket->so_options & 784 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 785 break; 786 } 787 } else { 788 /* 789 * Locate pcb for datagram. 790 */ 791 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 792 if (inp == 0) { 793 ++udpstat.udps_pcbhashmiss; 794 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 795 if (inp == 0) 796 return rcvcnt; 797 } 798 799 #ifdef IPSEC_NAT_T 800 /* Handle ESP over UDP */ 801 if (inp->inp_flags & INP_ESPINUDP_ALL) { 802 struct sockaddr *sa = (struct sockaddr *)src; 803 804 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 805 case -1: /* Error, m was freeed */ 806 rcvcnt = -1; 807 goto bad; 808 break; 809 810 case 1: /* ESP over UDP */ 811 rcvcnt++; 812 goto bad; 813 break; 814 815 case 0: /* plain UDP */ 816 default: /* Unexpected */ 817 /* 818 * Normal UDP processing will take place 819 * m may have changed. 820 */ 821 m = *mp; 822 break; 823 } 824 } 825 #endif 826 827 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 828 rcvcnt++; 829 } 830 831 bad: 832 return rcvcnt; 833 } 834 #endif 835 836 #ifdef INET6 837 static int 838 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 839 struct mbuf *m, int off) 840 { 841 u_int16_t sport, dport; 842 int rcvcnt; 843 struct in6_addr src6, *dst6; 844 const struct in_addr *dst4; 845 struct inpcb *inp; 846 847 rcvcnt = 0; 848 off += sizeof(struct udphdr); /* now, offset of payload */ 849 850 if (af != AF_INET && af != AF_INET6) 851 goto bad; 852 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 853 goto bad; 854 855 src6 = src->sin6_addr; 856 if (sa6_recoverscope(src) != 0) { 857 /* XXX: should be impossible. */ 858 goto bad; 859 } 860 sport = src->sin6_port; 861 862 dport = dst->sin6_port; 863 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 864 dst6 = &dst->sin6_addr; 865 866 if (IN6_IS_ADDR_MULTICAST(dst6) || 867 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 868 /* 869 * Deliver a multicast or broadcast datagram to *all* sockets 870 * for which the local and remote addresses and ports match 871 * those of the incoming datagram. This allows more than 872 * one process to receive multi/broadcasts on the same port. 873 * (This really ought to be done for unicast datagrams as 874 * well, but that would cause problems with existing 875 * applications that open both address-specific sockets and 876 * a wildcard socket listening to the same port -- they would 877 * end up receiving duplicates of every unicast datagram. 878 * Those applications open the multiple sockets to overcome an 879 * inadequacy of the UDP socket interface, but for backwards 880 * compatibility we avoid the problem here rather than 881 * fixing the interface. Maybe 4.5BSD will remedy this?) 882 */ 883 884 /* 885 * KAME note: traditionally we dropped udpiphdr from mbuf here. 886 * we need udpiphdr for IPsec processing so we do that later. 887 */ 888 /* 889 * Locate pcb(s) for datagram. 890 */ 891 CIRCLEQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) { 892 if (inp->inp_af != AF_INET6) 893 continue; 894 895 if (inp->inp_lport != dport) 896 continue; 897 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 898 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 899 dst6)) 900 continue; 901 } else { 902 if (IN6_IS_ADDR_V4MAPPED(dst6) && 903 (inp->inp_flags & IN6P_IPV6_V6ONLY)) 904 continue; 905 } 906 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 907 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 908 &src6) || inp->inp_fport != sport) 909 continue; 910 } else { 911 if (IN6_IS_ADDR_V4MAPPED(&src6) && 912 (inp->inp_flags & IN6P_IPV6_V6ONLY)) 913 continue; 914 } 915 916 udp6_sendup(m, off, (struct sockaddr *)src, 917 inp->inp_socket); 918 rcvcnt++; 919 920 /* 921 * Don't look for additional matches if this one does 922 * not have either the SO_REUSEPORT or SO_REUSEADDR 923 * socket options set. This heuristic avoids searching 924 * through all pcbs in the common case of a non-shared 925 * port. It assumes that an application will never 926 * clear these options after setting them. 927 */ 928 if ((inp->inp_socket->so_options & 929 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 930 break; 931 } 932 } else { 933 /* 934 * Locate pcb for datagram. 935 */ 936 inp = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 937 dport, 0); 938 if (inp == 0) { 939 ++udpstat.udps_pcbhashmiss; 940 inp = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 941 if (inp == 0) 942 return rcvcnt; 943 } 944 945 udp6_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 946 rcvcnt++; 947 } 948 949 bad: 950 return rcvcnt; 951 } 952 #endif 953 954 #ifdef INET 955 /* 956 * Notify a udp user of an asynchronous error; 957 * just wake up so that he can collect error status. 958 */ 959 static void 960 udp_notify(struct inpcb *inp, int errno) 961 { 962 inp->inp_socket->so_error = errno; 963 sorwakeup(inp->inp_socket); 964 sowwakeup(inp->inp_socket); 965 } 966 967 void * 968 udp_ctlinput(int cmd, struct sockaddr *sa, void *v) 969 { 970 struct ip *ip = v; 971 struct udphdr *uh; 972 void (*notify)(struct inpcb *, int) = udp_notify; 973 int errno; 974 975 if (sa->sa_family != AF_INET 976 || sa->sa_len != sizeof(struct sockaddr_in)) 977 return NULL; 978 if ((unsigned)cmd >= PRC_NCMDS) 979 return NULL; 980 errno = inetctlerrmap[cmd]; 981 if (PRC_IS_REDIRECT(cmd)) 982 notify = in_rtchange, ip = 0; 983 else if (cmd == PRC_HOSTDEAD) 984 ip = 0; 985 else if (errno == 0) 986 return NULL; 987 if (ip) { 988 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 989 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 990 ip->ip_src, uh->uh_sport, errno, notify); 991 992 /* XXX mapped address case */ 993 } else 994 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 995 notify); 996 return NULL; 997 } 998 999 int 1000 udp_ctloutput(op, so, level, optname, mp) 1001 int op; 1002 struct socket *so; 1003 int level, optname; 1004 struct mbuf **mp; 1005 { 1006 int s; 1007 int error = 0; 1008 struct mbuf *m; 1009 struct inpcb *inp; 1010 int family; 1011 1012 family = so->so_proto->pr_domain->dom_family; 1013 1014 s = splsoftnet(); 1015 switch (family) { 1016 #ifdef INET 1017 case PF_INET: 1018 if (level != IPPROTO_UDP) { 1019 error = ip_ctloutput(op, so, level, optname, mp); 1020 goto end; 1021 } 1022 break; 1023 #endif 1024 #ifdef INET6 1025 case PF_INET6: 1026 if (level != IPPROTO_UDP) { 1027 error = ip6_ctloutput(op, so, level, optname, mp); 1028 goto end; 1029 } 1030 break; 1031 #endif 1032 default: 1033 error = EAFNOSUPPORT; 1034 goto end; 1035 break; 1036 } 1037 1038 1039 switch (op) { 1040 case PRCO_SETOPT: 1041 m = *mp; 1042 inp = sotoinpcb(so); 1043 1044 switch (optname) { 1045 case UDP_ENCAP: 1046 if (m == NULL || m->m_len < sizeof (int)) { 1047 error = EINVAL; 1048 goto end; 1049 } 1050 1051 switch(*mtod(m, int *)) { 1052 #ifdef IPSEC_NAT_T 1053 case 0: 1054 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1055 break; 1056 1057 case UDP_ENCAP_ESPINUDP: 1058 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1059 inp->inp_flags |= INP_ESPINUDP; 1060 break; 1061 1062 case UDP_ENCAP_ESPINUDP_NON_IKE: 1063 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1064 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1065 break; 1066 #endif 1067 default: 1068 error = EINVAL; 1069 goto end; 1070 break; 1071 } 1072 break; 1073 1074 default: 1075 error = ENOPROTOOPT; 1076 goto end; 1077 break; 1078 } 1079 break; 1080 1081 default: 1082 error = EINVAL; 1083 goto end; 1084 break; 1085 } 1086 1087 end: 1088 splx(s); 1089 return error; 1090 } 1091 1092 1093 int 1094 udp_output(struct mbuf *m, ...) 1095 { 1096 struct inpcb *inp; 1097 struct udpiphdr *ui; 1098 struct route *ro; 1099 int len = m->m_pkthdr.len; 1100 int error = 0; 1101 va_list ap; 1102 1103 MCLAIM(m, &udp_tx_mowner); 1104 va_start(ap, m); 1105 inp = va_arg(ap, struct inpcb *); 1106 va_end(ap); 1107 1108 /* 1109 * Calculate data length and get a mbuf 1110 * for UDP and IP headers. 1111 */ 1112 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1113 if (m == 0) { 1114 error = ENOBUFS; 1115 goto release; 1116 } 1117 1118 /* 1119 * Compute the packet length of the IP header, and 1120 * punt if the length looks bogus. 1121 */ 1122 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1123 error = EMSGSIZE; 1124 goto release; 1125 } 1126 1127 /* 1128 * Fill in mbuf with extended UDP header 1129 * and addresses and length put into network format. 1130 */ 1131 ui = mtod(m, struct udpiphdr *); 1132 ui->ui_pr = IPPROTO_UDP; 1133 ui->ui_src = inp->inp_laddr; 1134 ui->ui_dst = inp->inp_faddr; 1135 ui->ui_sport = inp->inp_lport; 1136 ui->ui_dport = inp->inp_fport; 1137 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1138 1139 ro = &inp->inp_route; 1140 1141 /* 1142 * Set up checksum and output datagram. 1143 */ 1144 if (udpcksum) { 1145 /* 1146 * XXX Cache pseudo-header checksum part for 1147 * XXX "connected" UDP sockets. 1148 */ 1149 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1150 ui->ui_dst.s_addr, htons((u_int16_t)len + 1151 sizeof(struct udphdr) + IPPROTO_UDP)); 1152 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1153 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1154 } else 1155 ui->ui_sum = 0; 1156 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1157 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1158 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1159 udpstat.udps_opackets++; 1160 1161 return (ip_output(m, inp->inp_options, ro, 1162 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1163 inp->inp_moptions, inp->inp_socket)); 1164 1165 release: 1166 m_freem(m); 1167 return (error); 1168 } 1169 1170 int udp_sendspace = 9216; /* really max datagram size */ 1171 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1172 /* 40 1K datagrams */ 1173 1174 /*ARGSUSED*/ 1175 int 1176 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1177 struct mbuf *control, struct lwp *l) 1178 { 1179 struct inpcb *inp; 1180 struct proc *p; 1181 int s; 1182 int error = 0; 1183 1184 p = l ? l->l_proc : NULL; 1185 if (req == PRU_CONTROL) 1186 return (in_control(so, (long)m, (caddr_t)nam, 1187 (struct ifnet *)control, p)); 1188 1189 if (req == PRU_PURGEIF) { 1190 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1191 in_purgeif((struct ifnet *)control); 1192 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1193 return (0); 1194 } 1195 1196 s = splsoftnet(); 1197 inp = sotoinpcb(so); 1198 #ifdef DIAGNOSTIC 1199 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1200 panic("udp_usrreq: unexpected control mbuf"); 1201 #endif 1202 if (inp == 0 && req != PRU_ATTACH) { 1203 error = EINVAL; 1204 goto release; 1205 } 1206 1207 /* 1208 * Note: need to block udp_input while changing 1209 * the udp pcb queue and/or pcb addresses. 1210 */ 1211 switch (req) { 1212 1213 case PRU_ATTACH: 1214 if (inp != 0) { 1215 error = EISCONN; 1216 break; 1217 } 1218 #ifdef MBUFTRACE 1219 so->so_mowner = &udp_mowner; 1220 so->so_rcv.sb_mowner = &udp_rx_mowner; 1221 so->so_snd.sb_mowner = &udp_tx_mowner; 1222 #endif 1223 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1224 error = soreserve(so, udp_sendspace, udp_recvspace); 1225 if (error) 1226 break; 1227 } 1228 error = in_pcballoc(so, &udbtable); 1229 if (error) 1230 break; 1231 inp = sotoinpcb(so); 1232 inp->inp_ip.ip_ttl = ip_defttl; 1233 break; 1234 1235 case PRU_DETACH: 1236 in_pcbdetach(inp); 1237 break; 1238 1239 case PRU_BIND: 1240 error = in_pcbbind(inp, nam, p); 1241 break; 1242 1243 case PRU_LISTEN: 1244 error = EOPNOTSUPP; 1245 break; 1246 1247 case PRU_CONNECT: 1248 error = in_pcbconnect(inp, nam, p); 1249 if (error) 1250 break; 1251 soisconnected(so); 1252 break; 1253 1254 case PRU_CONNECT2: 1255 error = EOPNOTSUPP; 1256 break; 1257 1258 case PRU_DISCONNECT: 1259 /*soisdisconnected(so);*/ 1260 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1261 in_pcbdisconnect(inp); 1262 inp->inp_laddr = zeroin_addr; /* XXX */ 1263 in_pcbstate(inp, INP_BOUND); /* XXX */ 1264 break; 1265 1266 case PRU_SHUTDOWN: 1267 socantsendmore(so); 1268 break; 1269 1270 case PRU_RCVD: 1271 error = EOPNOTSUPP; 1272 break; 1273 1274 case PRU_SEND: 1275 if (control && control->m_len) { 1276 m_freem(control); 1277 m_freem(m); 1278 error = EINVAL; 1279 break; 1280 } 1281 { 1282 struct in_addr laddr; /* XXX */ 1283 1284 if (nam) { 1285 laddr = inp->inp_laddr; /* XXX */ 1286 if ((so->so_state & SS_ISCONNECTED) != 0) { 1287 error = EISCONN; 1288 goto die; 1289 } 1290 error = in_pcbconnect(inp, nam, p); 1291 if (error) 1292 goto die; 1293 } else { 1294 if ((so->so_state & SS_ISCONNECTED) == 0) { 1295 error = ENOTCONN; 1296 goto die; 1297 } 1298 } 1299 error = udp_output(m, inp); 1300 m = NULL; 1301 if (nam) { 1302 in_pcbdisconnect(inp); 1303 inp->inp_laddr = laddr; /* XXX */ 1304 in_pcbstate(inp, INP_BOUND); /* XXX */ 1305 } 1306 die: 1307 if (m) 1308 m_freem(m); 1309 } 1310 break; 1311 1312 case PRU_SENSE: 1313 /* 1314 * stat: don't bother with a blocksize. 1315 */ 1316 splx(s); 1317 return (0); 1318 1319 case PRU_RCVOOB: 1320 error = EOPNOTSUPP; 1321 break; 1322 1323 case PRU_SENDOOB: 1324 m_freem(control); 1325 m_freem(m); 1326 error = EOPNOTSUPP; 1327 break; 1328 1329 case PRU_SOCKADDR: 1330 in_setsockaddr(inp, nam); 1331 break; 1332 1333 case PRU_PEERADDR: 1334 in_setpeeraddr(inp, nam); 1335 break; 1336 1337 default: 1338 panic("udp_usrreq"); 1339 } 1340 1341 release: 1342 splx(s); 1343 return (error); 1344 } 1345 1346 /* 1347 * Sysctl for udp variables. 1348 */ 1349 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1350 { 1351 1352 sysctl_createv(clog, 0, NULL, NULL, 1353 CTLFLAG_PERMANENT, 1354 CTLTYPE_NODE, "net", NULL, 1355 NULL, 0, NULL, 0, 1356 CTL_NET, CTL_EOL); 1357 sysctl_createv(clog, 0, NULL, NULL, 1358 CTLFLAG_PERMANENT, 1359 CTLTYPE_NODE, "inet", NULL, 1360 NULL, 0, NULL, 0, 1361 CTL_NET, PF_INET, CTL_EOL); 1362 sysctl_createv(clog, 0, NULL, NULL, 1363 CTLFLAG_PERMANENT, 1364 CTLTYPE_NODE, "udp", 1365 SYSCTL_DESCR("UDPv4 related settings"), 1366 NULL, 0, NULL, 0, 1367 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1368 1369 sysctl_createv(clog, 0, NULL, NULL, 1370 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1371 CTLTYPE_INT, "checksum", 1372 SYSCTL_DESCR("Compute UDP checksums"), 1373 NULL, 0, &udpcksum, 0, 1374 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1375 CTL_EOL); 1376 sysctl_createv(clog, 0, NULL, NULL, 1377 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1378 CTLTYPE_INT, "sendspace", 1379 SYSCTL_DESCR("Default UDP send buffer size"), 1380 NULL, 0, &udp_sendspace, 0, 1381 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1382 CTL_EOL); 1383 sysctl_createv(clog, 0, NULL, NULL, 1384 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1385 CTLTYPE_INT, "recvspace", 1386 SYSCTL_DESCR("Default UDP receive buffer size"), 1387 NULL, 0, &udp_recvspace, 0, 1388 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1389 CTL_EOL); 1390 sysctl_createv(clog, 0, NULL, NULL, 1391 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1392 CTLTYPE_INT, "do_loopback_cksum", 1393 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1394 NULL, 0, &udp_do_loopback_cksum, 0, 1395 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1396 CTL_EOL); 1397 sysctl_createv(clog, 0, NULL, NULL, 1398 CTLFLAG_PERMANENT, 1399 CTLTYPE_STRUCT, "pcblist", 1400 SYSCTL_DESCR("UDP protocol control block list"), 1401 sysctl_inpcblist, 0, &udbtable, 0, 1402 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1403 CTL_EOL); 1404 sysctl_createv(clog, 0, NULL, NULL, 1405 CTLFLAG_PERMANENT, 1406 CTLTYPE_STRUCT, "stats", 1407 SYSCTL_DESCR("UDP statistics"), 1408 NULL, 0, &udpstat, sizeof(udpstat), 1409 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1410 CTL_EOL); 1411 } 1412 #endif 1413 1414 #if (defined INET && defined IPSEC_NAT_T) 1415 /* 1416 * Returns: 1417 * 1 if the packet was processed 1418 * 0 if normal UDP processing should take place 1419 * -1 if an error occurent and m was freed 1420 */ 1421 static int 1422 udp4_espinudp(mp, off, src, so) 1423 struct mbuf **mp; 1424 int off; 1425 struct sockaddr *src; 1426 struct socket *so; 1427 { 1428 size_t len; 1429 caddr_t data; 1430 struct inpcb *inp; 1431 size_t skip = 0; 1432 size_t minlen; 1433 size_t iphdrlen; 1434 struct ip *ip; 1435 struct mbuf *n; 1436 struct m_tag *tag; 1437 struct udphdr *udphdr; 1438 u_int16_t sport, dport; 1439 struct mbuf *m = *mp; 1440 1441 /* 1442 * Collapse the mbuf chain if the first mbuf is too short 1443 * The longest case is: UDP + non ESP marker + ESP 1444 */ 1445 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1446 if (minlen > m->m_pkthdr.len) 1447 minlen = m->m_pkthdr.len; 1448 1449 if (m->m_len < minlen) { 1450 if ((*mp = m_pullup(m, minlen)) == NULL) { 1451 printf("udp4_espinudp: m_pullup failed\n"); 1452 return -1; 1453 } 1454 m = *mp; 1455 } 1456 1457 len = m->m_len - off; 1458 data = mtod(m, caddr_t) + off; 1459 inp = sotoinpcb(so); 1460 1461 /* Ignore keepalive packets */ 1462 if ((len == 1) && (data[0] == '\xff')) { 1463 return 1; 1464 } 1465 1466 /* 1467 * Check that the payload is long enough to hold 1468 * an ESP header and compute the length of encapsulation 1469 * header to remove 1470 */ 1471 if (inp->inp_flags & INP_ESPINUDP) { 1472 u_int32_t *st = (u_int32_t *)data; 1473 1474 if ((len <= sizeof(struct esp)) || (*st == 0)) 1475 return 0; /* Normal UDP processing */ 1476 1477 skip = sizeof(struct udphdr); 1478 } 1479 1480 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1481 u_int32_t *st = (u_int32_t *)data; 1482 1483 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1484 || ((st[0] | st[1]) != 0)) 1485 return 0; /* Normal UDP processing */ 1486 1487 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1488 } 1489 1490 /* 1491 * Get the UDP ports. They are handled in network 1492 * order everywhere in IPSEC_NAT_T code. 1493 */ 1494 udphdr = (struct udphdr *)(data - skip); 1495 sport = udphdr->uh_sport; 1496 dport = udphdr->uh_dport; 1497 1498 /* 1499 * Remove the UDP header (and possibly the non ESP marker) 1500 * IP header lendth is iphdrlen 1501 * Before: 1502 * <--- off ---> 1503 * +----+------+-----+ 1504 * | IP | UDP | ESP | 1505 * +----+------+-----+ 1506 * <-skip-> 1507 * After: 1508 * +----+-----+ 1509 * | IP | ESP | 1510 * +----+-----+ 1511 * <-skip-> 1512 */ 1513 iphdrlen = off - sizeof(struct udphdr); 1514 memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen); 1515 m_adj(m, skip); 1516 1517 ip = mtod(m, struct ip *); 1518 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1519 ip->ip_p = IPPROTO_ESP; 1520 1521 /* 1522 * Copy the mbuf to avoid multiple free, as both 1523 * esp4_input (which we call) and udp_input (which 1524 * called us) free the mbuf. 1525 */ 1526 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1527 printf("udp4_espinudp: m_dup failed\n"); 1528 return 0; 1529 } 1530 1531 /* 1532 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1533 * the source UDP port. This is required if we want 1534 * to select the right SPD for multiple hosts behind 1535 * same NAT 1536 */ 1537 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1538 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1539 printf("udp4_espinudp: m_tag_get failed\n"); 1540 m_freem(n); 1541 return 0; 1542 } 1543 ((u_int16_t *)(tag + 1))[0] = sport; 1544 ((u_int16_t *)(tag + 1))[1] = dport; 1545 m_tag_prepend(n, tag); 1546 1547 esp4_input(n, iphdrlen); 1548 1549 /* We handled it, it shoudln't be handled by UDP */ 1550 return 1; 1551 } 1552 #endif 1553
Indexes created Fri Sep 26 20:09:58 GMT 2025