udp_usrreq.c revision 1.132
1 /* $NetBSD: udp_usrreq.c,v 1.132 2005/03/09 05:07:19 atatat 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 1.132 2005/03/09 05:07:19 atatat 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 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 191 NULL, "udp", "hwcsum bad"); 192 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 193 NULL, "udp", "hwcsum ok"); 194 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 195 NULL, "udp", "hwcsum data"); 196 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 197 NULL, "udp", "swcsum"); 198 199 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 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); 205 206 #else 207 208 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 209 210 #endif /* UDP_CSUM_COUNTERS */ 211 212 void 213 udp_init(void) 214 { 215 216 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 217 218 MOWNER_ATTACH(&udp_tx_mowner); 219 MOWNER_ATTACH(&udp_rx_mowner); 220 MOWNER_ATTACH(&udp_mowner); 221 } 222 223 /* 224 * Checksum extended UDP header and data. 225 */ 226 227 int 228 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 229 int iphlen, int len) 230 { 231 232 switch (af) { 233 #ifdef INET 234 case AF_INET: 235 return udp4_input_checksum(m, uh, iphlen, len); 236 #endif 237 #ifdef INET6 238 case AF_INET6: 239 return udp6_input_checksum(m, uh, iphlen, len); 240 #endif 241 } 242 #ifdef DIAGNOSTIC 243 panic("udp_input_checksum: unknown af %d", af); 244 #endif 245 /* NOTREACHED */ 246 return -1; 247 } 248 249 #ifdef INET 250 251 /* 252 * Checksum extended UDP header and data. 253 */ 254 255 static int 256 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 257 int iphlen, int len) 258 { 259 260 /* 261 * XXX it's better to record and check if this mbuf is 262 * already checked. 263 */ 264 265 if (uh->uh_sum == 0) 266 return 0; 267 268 switch (m->m_pkthdr.csum_flags & 269 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 270 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 271 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 272 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 273 goto badcsum; 274 275 case M_CSUM_UDPv4|M_CSUM_DATA: { 276 u_int32_t hw_csum = m->m_pkthdr.csum_data; 277 278 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 279 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 280 const struct ip *ip = 281 mtod(m, const struct ip *); 282 283 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 284 ip->ip_dst.s_addr, 285 htons(hw_csum + len + IPPROTO_UDP)); 286 } 287 if ((hw_csum ^ 0xffff) != 0) 288 goto badcsum; 289 break; 290 } 291 292 case M_CSUM_UDPv4: 293 /* Checksum was okay. */ 294 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 295 break; 296 297 default: 298 /* 299 * Need to compute it ourselves. Maybe skip checksum 300 * on loopback interfaces. 301 */ 302 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 303 IFF_LOOPBACK) || 304 udp_do_loopback_cksum)) { 305 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 306 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 307 goto badcsum; 308 } 309 break; 310 } 311 312 return 0; 313 314 badcsum: 315 udpstat.udps_badsum++; 316 return -1; 317 } 318 319 void 320 udp_input(struct mbuf *m, ...) 321 { 322 va_list ap; 323 struct sockaddr_in src, dst; 324 struct ip *ip; 325 struct udphdr *uh; 326 int iphlen; 327 int len; 328 int n; 329 u_int16_t ip_len; 330 331 va_start(ap, m); 332 iphlen = va_arg(ap, int); 333 (void)va_arg(ap, int); /* ignore value, advance ap */ 334 va_end(ap); 335 336 MCLAIM(m, &udp_rx_mowner); 337 udpstat.udps_ipackets++; 338 339 /* 340 * Get IP and UDP header together in first mbuf. 341 */ 342 ip = mtod(m, struct ip *); 343 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 344 if (uh == NULL) { 345 udpstat.udps_hdrops++; 346 return; 347 } 348 KASSERT(UDP_HDR_ALIGNED_P(uh)); 349 350 /* destination port of 0 is illegal, based on RFC768. */ 351 if (uh->uh_dport == 0) 352 goto bad; 353 354 /* 355 * Make mbuf data length reflect UDP length. 356 * If not enough data to reflect UDP length, drop. 357 */ 358 ip_len = ntohs(ip->ip_len); 359 len = ntohs((u_int16_t)uh->uh_ulen); 360 if (ip_len != iphlen + len) { 361 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 362 udpstat.udps_badlen++; 363 goto bad; 364 } 365 m_adj(m, iphlen + len - ip_len); 366 } 367 368 /* 369 * Checksum extended UDP header and data. 370 */ 371 if (udp4_input_checksum(m, uh, iphlen, len)) 372 goto badcsum; 373 374 /* construct source and dst sockaddrs. */ 375 bzero(&src, sizeof(src)); 376 src.sin_family = AF_INET; 377 src.sin_len = sizeof(struct sockaddr_in); 378 bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr)); 379 src.sin_port = uh->uh_sport; 380 bzero(&dst, sizeof(dst)); 381 dst.sin_family = AF_INET; 382 dst.sin_len = sizeof(struct sockaddr_in); 383 bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr)); 384 dst.sin_port = uh->uh_dport; 385 386 n = udp4_realinput(&src, &dst, m, iphlen); 387 #ifdef INET6 388 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 389 struct sockaddr_in6 src6, dst6; 390 391 bzero(&src6, sizeof(src6)); 392 src6.sin6_family = AF_INET6; 393 src6.sin6_len = sizeof(struct sockaddr_in6); 394 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 395 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 396 sizeof(ip->ip_src)); 397 src6.sin6_port = uh->uh_sport; 398 bzero(&dst6, sizeof(dst6)); 399 dst6.sin6_family = AF_INET6; 400 dst6.sin6_len = sizeof(struct sockaddr_in6); 401 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 402 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 403 sizeof(ip->ip_dst)); 404 dst6.sin6_port = uh->uh_dport; 405 406 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 407 } 408 #endif 409 410 if (n == 0) { 411 if (m->m_flags & (M_BCAST | M_MCAST)) { 412 udpstat.udps_noportbcast++; 413 goto bad; 414 } 415 udpstat.udps_noport++; 416 #ifdef IPKDB 417 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 418 m, iphlen + sizeof(struct udphdr), 419 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 420 /* 421 * It was a debugger connect packet, 422 * just drop it now 423 */ 424 goto bad; 425 } 426 #endif 427 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 428 m = NULL; 429 } 430 431 bad: 432 if (m) 433 m_freem(m); 434 return; 435 436 badcsum: 437 m_freem(m); 438 } 439 #endif 440 441 #ifdef INET6 442 static int 443 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 444 { 445 446 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 447 goto good; 448 } 449 if (uh->uh_sum == 0) { 450 udp6stat.udp6s_nosum++; 451 goto bad; 452 } 453 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 454 udp6stat.udp6s_badsum++; 455 goto bad; 456 } 457 458 good: 459 return 0; 460 bad: 461 return -1; 462 } 463 464 int 465 udp6_input(struct mbuf **mp, int *offp, int proto) 466 { 467 struct mbuf *m = *mp; 468 int off = *offp; 469 struct sockaddr_in6 src, dst; 470 struct ip6_hdr *ip6; 471 struct udphdr *uh; 472 u_int32_t plen, ulen; 473 474 ip6 = mtod(m, struct ip6_hdr *); 475 476 #if defined(NFAITH) && 0 < NFAITH 477 if (faithprefix(&ip6->ip6_dst)) { 478 /* send icmp6 host unreach? */ 479 m_freem(m); 480 return IPPROTO_DONE; 481 } 482 #endif 483 484 udp6stat.udp6s_ipackets++; 485 486 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 487 plen = m->m_pkthdr.len - off; 488 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 489 if (uh == NULL) { 490 ip6stat.ip6s_tooshort++; 491 return IPPROTO_DONE; 492 } 493 KASSERT(UDP_HDR_ALIGNED_P(uh)); 494 ulen = ntohs((u_short)uh->uh_ulen); 495 /* 496 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 497 * iff payload length > 0xffff. 498 */ 499 if (ulen == 0 && plen > 0xffff) 500 ulen = plen; 501 502 if (plen != ulen) { 503 udp6stat.udp6s_badlen++; 504 goto bad; 505 } 506 507 /* destination port of 0 is illegal, based on RFC768. */ 508 if (uh->uh_dport == 0) 509 goto bad; 510 511 /* Be proactive about malicious use of IPv4 mapped address */ 512 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 513 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 514 /* XXX stat */ 515 goto bad; 516 } 517 518 /* 519 * Checksum extended UDP header and data. Maybe skip checksum 520 * on loopback interfaces. 521 */ 522 if (udp6_input_checksum(m, uh, off, ulen)) 523 goto bad; 524 525 /* 526 * Construct source and dst sockaddrs. 527 * Note that ifindex (s6_addr16[1]) is already filled. 528 */ 529 bzero(&src, sizeof(src)); 530 src.sin6_family = AF_INET6; 531 src.sin6_len = sizeof(struct sockaddr_in6); 532 /* KAME hack: recover scopeid */ 533 (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif); 534 src.sin6_port = uh->uh_sport; 535 bzero(&dst, sizeof(dst)); 536 dst.sin6_family = AF_INET6; 537 dst.sin6_len = sizeof(struct sockaddr_in6); 538 /* KAME hack: recover scopeid */ 539 (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif); 540 dst.sin6_port = uh->uh_dport; 541 542 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 543 if (m->m_flags & M_MCAST) { 544 udp6stat.udp6s_noportmcast++; 545 goto bad; 546 } 547 udp6stat.udp6s_noport++; 548 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 549 m = NULL; 550 } 551 552 bad: 553 if (m) 554 m_freem(m); 555 return IPPROTO_DONE; 556 } 557 #endif 558 559 #ifdef INET 560 static void 561 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 562 struct sockaddr *src, struct socket *so) 563 { 564 struct mbuf *opts = NULL; 565 struct mbuf *n; 566 struct inpcb *inp = NULL; 567 568 if (!so) 569 return; 570 switch (so->so_proto->pr_domain->dom_family) { 571 case AF_INET: 572 inp = sotoinpcb(so); 573 break; 574 #ifdef INET6 575 case AF_INET6: 576 break; 577 #endif 578 default: 579 return; 580 } 581 582 #if defined(IPSEC) || defined(FAST_IPSEC) 583 /* check AH/ESP integrity. */ 584 if (so != NULL && ipsec4_in_reject_so(m, so)) { 585 ipsecstat.in_polvio++; 586 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 587 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 588 0, 0); 589 return; 590 } 591 #endif /*IPSEC*/ 592 593 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 594 if (inp && (inp->inp_flags & INP_CONTROLOPTS 595 || so->so_options & SO_TIMESTAMP)) { 596 struct ip *ip = mtod(n, struct ip *); 597 ip_savecontrol(inp, &opts, ip, n); 598 } 599 600 m_adj(n, off); 601 if (sbappendaddr(&so->so_rcv, src, n, 602 opts) == 0) { 603 m_freem(n); 604 if (opts) 605 m_freem(opts); 606 so->so_rcv.sb_overflowed++; 607 udpstat.udps_fullsock++; 608 } else 609 sorwakeup(so); 610 } 611 } 612 #endif 613 614 #ifdef INET6 615 static void 616 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 617 struct sockaddr *src, struct socket *so) 618 { 619 struct mbuf *opts = NULL; 620 struct mbuf *n; 621 struct in6pcb *in6p = NULL; 622 623 if (!so) 624 return; 625 if (so->so_proto->pr_domain->dom_family != AF_INET6) 626 return; 627 in6p = sotoin6pcb(so); 628 629 #if defined(IPSEC) || defined(FAST_IPSEC) 630 /* check AH/ESP integrity. */ 631 if (so != NULL && ipsec6_in_reject_so(m, so)) { 632 ipsec6stat.in_polvio++; 633 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 634 icmp6_error(n, ICMP6_DST_UNREACH, 635 ICMP6_DST_UNREACH_ADMIN, 0); 636 return; 637 } 638 #endif /*IPSEC*/ 639 640 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 641 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 642 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 643 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 644 ip6_savecontrol(in6p, &opts, ip6, n); 645 } 646 647 m_adj(n, off); 648 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 649 m_freem(n); 650 if (opts) 651 m_freem(opts); 652 so->so_rcv.sb_overflowed++; 653 udp6stat.udp6s_fullsock++; 654 } else 655 sorwakeup(so); 656 } 657 } 658 #endif 659 660 #ifdef INET 661 static int 662 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 663 struct mbuf *m, int off /* offset of udphdr */) 664 { 665 u_int16_t *sport, *dport; 666 int rcvcnt; 667 struct in_addr *src4, *dst4; 668 struct inpcb_hdr *inph; 669 struct inpcb *inp; 670 671 rcvcnt = 0; 672 off += sizeof(struct udphdr); /* now, offset of payload */ 673 674 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 675 goto bad; 676 677 src4 = &src->sin_addr; 678 sport = &src->sin_port; 679 dst4 = &dst->sin_addr; 680 dport = &dst->sin_port; 681 682 if (IN_MULTICAST(dst4->s_addr) || 683 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 684 /* 685 * Deliver a multicast or broadcast datagram to *all* sockets 686 * for which the local and remote addresses and ports match 687 * those of the incoming datagram. This allows more than 688 * one process to receive multi/broadcasts on the same port. 689 * (This really ought to be done for unicast datagrams as 690 * well, but that would cause problems with existing 691 * applications that open both address-specific sockets and 692 * a wildcard socket listening to the same port -- they would 693 * end up receiving duplicates of every unicast datagram. 694 * Those applications open the multiple sockets to overcome an 695 * inadequacy of the UDP socket interface, but for backwards 696 * compatibility we avoid the problem here rather than 697 * fixing the interface. Maybe 4.5BSD will remedy this?) 698 */ 699 700 /* 701 * KAME note: traditionally we dropped udpiphdr from mbuf here. 702 * we need udpiphdr for IPsec processing so we do that later. 703 */ 704 /* 705 * Locate pcb(s) for datagram. 706 */ 707 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 708 inp = (struct inpcb *)inph; 709 if (inp->inp_af != AF_INET) 710 continue; 711 712 if (inp->inp_lport != *dport) 713 continue; 714 if (!in_nullhost(inp->inp_laddr)) { 715 if (!in_hosteq(inp->inp_laddr, *dst4)) 716 continue; 717 } 718 if (!in_nullhost(inp->inp_faddr)) { 719 if (!in_hosteq(inp->inp_faddr, *src4) || 720 inp->inp_fport != *sport) 721 continue; 722 } 723 724 udp4_sendup(m, off, (struct sockaddr *)src, 725 inp->inp_socket); 726 rcvcnt++; 727 728 /* 729 * Don't look for additional matches if this one does 730 * not have either the SO_REUSEPORT or SO_REUSEADDR 731 * socket options set. This heuristic avoids searching 732 * through all pcbs in the common case of a non-shared 733 * port. It assumes that an application will never 734 * clear these options after setting them. 735 */ 736 if ((inp->inp_socket->so_options & 737 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 738 break; 739 } 740 } else { 741 /* 742 * Locate pcb for datagram. 743 */ 744 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 745 if (inp == 0) { 746 ++udpstat.udps_pcbhashmiss; 747 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 748 if (inp == 0) 749 return rcvcnt; 750 } 751 752 #ifdef IPSEC_NAT_T 753 /* Handle ESP over UDP */ 754 if (inp->inp_flags & INP_ESPINUDP_ALL) { 755 struct sockaddr *sa = (struct sockaddr *)src; 756 757 if (udp4_espinudp(m, off, sa, inp->inp_socket) != 0) { 758 rcvcnt++; 759 goto bad; 760 } 761 762 /* Normal UDP processing will take place */ 763 } 764 #endif 765 766 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 767 rcvcnt++; 768 } 769 770 bad: 771 return rcvcnt; 772 } 773 #endif 774 775 #ifdef INET6 776 static int 777 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 778 struct mbuf *m, int off) 779 { 780 u_int16_t sport, dport; 781 int rcvcnt; 782 struct in6_addr src6, dst6; 783 const struct in_addr *dst4; 784 struct inpcb_hdr *inph; 785 struct in6pcb *in6p; 786 787 rcvcnt = 0; 788 off += sizeof(struct udphdr); /* now, offset of payload */ 789 790 if (af != AF_INET && af != AF_INET6) 791 goto bad; 792 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 793 goto bad; 794 795 in6_embedscope(&src6, src, NULL, NULL); 796 sport = src->sin6_port; 797 in6_embedscope(&dst6, dst, NULL, NULL); 798 dport = dst->sin6_port; 799 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 800 801 if (IN6_IS_ADDR_MULTICAST(&dst6) || 802 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 803 /* 804 * Deliver a multicast or broadcast datagram to *all* sockets 805 * for which the local and remote addresses and ports match 806 * those of the incoming datagram. This allows more than 807 * one process to receive multi/broadcasts on the same port. 808 * (This really ought to be done for unicast datagrams as 809 * well, but that would cause problems with existing 810 * applications that open both address-specific sockets and 811 * a wildcard socket listening to the same port -- they would 812 * end up receiving duplicates of every unicast datagram. 813 * Those applications open the multiple sockets to overcome an 814 * inadequacy of the UDP socket interface, but for backwards 815 * compatibility we avoid the problem here rather than 816 * fixing the interface. Maybe 4.5BSD will remedy this?) 817 */ 818 819 /* 820 * KAME note: traditionally we dropped udpiphdr from mbuf here. 821 * we need udpiphdr for IPsec processing so we do that later. 822 */ 823 /* 824 * Locate pcb(s) for datagram. 825 */ 826 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 827 in6p = (struct in6pcb *)inph; 828 if (in6p->in6p_af != AF_INET6) 829 continue; 830 831 if (in6p->in6p_lport != dport) 832 continue; 833 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 834 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6)) 835 continue; 836 } else { 837 if (IN6_IS_ADDR_V4MAPPED(&dst6) && 838 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 839 continue; 840 } 841 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 842 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 843 &src6) || in6p->in6p_fport != sport) 844 continue; 845 } else { 846 if (IN6_IS_ADDR_V4MAPPED(&src6) && 847 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 848 continue; 849 } 850 851 udp6_sendup(m, off, (struct sockaddr *)src, 852 in6p->in6p_socket); 853 rcvcnt++; 854 855 /* 856 * Don't look for additional matches if this one does 857 * not have either the SO_REUSEPORT or SO_REUSEADDR 858 * socket options set. This heuristic avoids searching 859 * through all pcbs in the common case of a non-shared 860 * port. It assumes that an application will never 861 * clear these options after setting them. 862 */ 863 if ((in6p->in6p_socket->so_options & 864 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 865 break; 866 } 867 } else { 868 /* 869 * Locate pcb for datagram. 870 */ 871 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, 872 &dst6, dport, 0); 873 if (in6p == 0) { 874 ++udpstat.udps_pcbhashmiss; 875 in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0); 876 if (in6p == 0) 877 return rcvcnt; 878 } 879 880 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 881 rcvcnt++; 882 } 883 884 bad: 885 return rcvcnt; 886 } 887 #endif 888 889 #ifdef INET 890 /* 891 * Notify a udp user of an asynchronous error; 892 * just wake up so that he can collect error status. 893 */ 894 static void 895 udp_notify(struct inpcb *inp, int errno) 896 { 897 inp->inp_socket->so_error = errno; 898 sorwakeup(inp->inp_socket); 899 sowwakeup(inp->inp_socket); 900 } 901 902 void * 903 udp_ctlinput(int cmd, struct sockaddr *sa, void *v) 904 { 905 struct ip *ip = v; 906 struct udphdr *uh; 907 void (*notify)(struct inpcb *, int) = udp_notify; 908 int errno; 909 910 if (sa->sa_family != AF_INET 911 || sa->sa_len != sizeof(struct sockaddr_in)) 912 return NULL; 913 if ((unsigned)cmd >= PRC_NCMDS) 914 return NULL; 915 errno = inetctlerrmap[cmd]; 916 if (PRC_IS_REDIRECT(cmd)) 917 notify = in_rtchange, ip = 0; 918 else if (cmd == PRC_HOSTDEAD) 919 ip = 0; 920 else if (errno == 0) 921 return NULL; 922 if (ip) { 923 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 924 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 925 ip->ip_src, uh->uh_sport, errno, notify); 926 927 /* XXX mapped address case */ 928 } else 929 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 930 notify); 931 return NULL; 932 } 933 934 int 935 udp_ctloutput(op, so, level, optname, mp) 936 int op; 937 struct socket *so; 938 int level, optname; 939 struct mbuf **mp; 940 { 941 int s; 942 int error = 0; 943 struct mbuf *m; 944 struct inpcb *inp; 945 int family; 946 947 family = so->so_proto->pr_domain->dom_family; 948 949 s = splsoftnet(); 950 switch (family) { 951 #ifdef INET 952 case PF_INET: 953 if (level != IPPROTO_UDP) { 954 error = ip_ctloutput(op, so, level, optname, mp); 955 goto end; 956 } 957 break; 958 #endif 959 #ifdef INET6 960 case PF_INET6: 961 if (level != IPPROTO_UDP) { 962 error = ip6_ctloutput(op, so, level, optname, mp); 963 goto end; 964 } 965 break; 966 #endif 967 default: 968 error = EAFNOSUPPORT; 969 goto end; 970 break; 971 } 972 973 974 switch (op) { 975 case PRCO_SETOPT: 976 m = *mp; 977 inp = sotoinpcb(so); 978 979 switch (optname) { 980 case UDP_ENCAP: 981 if (m == NULL || m->m_len < sizeof (int)) { 982 error = EINVAL; 983 goto end; 984 } 985 986 switch(*mtod(m, int *)) { 987 #ifdef IPSEC_NAT_T 988 case 0: 989 inp->inp_flags &= ~INP_ESPINUDP_ALL; 990 break; 991 992 case UDP_ENCAP_ESPINUDP: 993 inp->inp_flags &= ~INP_ESPINUDP_ALL; 994 inp->inp_flags |= INP_ESPINUDP; 995 break; 996 997 case UDP_ENCAP_ESPINUDP_NON_IKE: 998 inp->inp_flags &= ~INP_ESPINUDP_ALL; 999 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1000 break; 1001 #endif 1002 default: 1003 error = EINVAL; 1004 goto end; 1005 break; 1006 } 1007 break; 1008 1009 default: 1010 error = ENOPROTOOPT; 1011 goto end; 1012 break; 1013 } 1014 break; 1015 1016 default: 1017 error = EINVAL; 1018 goto end; 1019 break; 1020 } 1021 1022 end: 1023 splx(s); 1024 return error; 1025 } 1026 1027 1028 int 1029 udp_output(struct mbuf *m, ...) 1030 { 1031 struct inpcb *inp; 1032 struct udpiphdr *ui; 1033 struct route *ro; 1034 int len = m->m_pkthdr.len; 1035 int error = 0; 1036 va_list ap; 1037 1038 MCLAIM(m, &udp_tx_mowner); 1039 va_start(ap, m); 1040 inp = va_arg(ap, struct inpcb *); 1041 va_end(ap); 1042 1043 /* 1044 * Calculate data length and get a mbuf 1045 * for UDP and IP headers. 1046 */ 1047 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1048 if (m == 0) { 1049 error = ENOBUFS; 1050 goto release; 1051 } 1052 1053 /* 1054 * Compute the packet length of the IP header, and 1055 * punt if the length looks bogus. 1056 */ 1057 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1058 error = EMSGSIZE; 1059 goto release; 1060 } 1061 1062 /* 1063 * Fill in mbuf with extended UDP header 1064 * and addresses and length put into network format. 1065 */ 1066 ui = mtod(m, struct udpiphdr *); 1067 ui->ui_pr = IPPROTO_UDP; 1068 ui->ui_src = inp->inp_laddr; 1069 ui->ui_dst = inp->inp_faddr; 1070 ui->ui_sport = inp->inp_lport; 1071 ui->ui_dport = inp->inp_fport; 1072 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1073 1074 ro = &inp->inp_route; 1075 1076 /* 1077 * Set up checksum and output datagram. 1078 */ 1079 if (udpcksum) { 1080 /* 1081 * XXX Cache pseudo-header checksum part for 1082 * XXX "connected" UDP sockets. 1083 * Maybe skip checksums on loopback interfaces. 1084 */ 1085 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1086 ui->ui_dst.s_addr, htons((u_int16_t)len + 1087 sizeof(struct udphdr) + IPPROTO_UDP)); 1088 if (__predict_true(ro->ro_rt == NULL || 1089 !(ro->ro_rt->rt_ifp->if_flags & 1090 IFF_LOOPBACK) || 1091 udp_do_loopback_cksum)) 1092 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1093 else 1094 m->m_pkthdr.csum_flags = 0; 1095 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1096 } else 1097 ui->ui_sum = 0; 1098 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1099 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1100 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1101 udpstat.udps_opackets++; 1102 1103 return (ip_output(m, inp->inp_options, ro, 1104 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1105 inp->inp_moptions, inp->inp_socket)); 1106 1107 release: 1108 m_freem(m); 1109 return (error); 1110 } 1111 1112 int udp_sendspace = 9216; /* really max datagram size */ 1113 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1114 /* 40 1K datagrams */ 1115 1116 /*ARGSUSED*/ 1117 int 1118 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1119 struct mbuf *control, struct proc *p) 1120 { 1121 struct inpcb *inp; 1122 int s; 1123 int error = 0; 1124 1125 if (req == PRU_CONTROL) 1126 return (in_control(so, (long)m, (caddr_t)nam, 1127 (struct ifnet *)control, p)); 1128 1129 if (req == PRU_PURGEIF) { 1130 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1131 in_purgeif((struct ifnet *)control); 1132 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1133 return (0); 1134 } 1135 1136 s = splsoftnet(); 1137 inp = sotoinpcb(so); 1138 #ifdef DIAGNOSTIC 1139 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1140 panic("udp_usrreq: unexpected control mbuf"); 1141 #endif 1142 if (inp == 0 && req != PRU_ATTACH) { 1143 error = EINVAL; 1144 goto release; 1145 } 1146 1147 /* 1148 * Note: need to block udp_input while changing 1149 * the udp pcb queue and/or pcb addresses. 1150 */ 1151 switch (req) { 1152 1153 case PRU_ATTACH: 1154 if (inp != 0) { 1155 error = EISCONN; 1156 break; 1157 } 1158 #ifdef MBUFTRACE 1159 so->so_mowner = &udp_mowner; 1160 so->so_rcv.sb_mowner = &udp_rx_mowner; 1161 so->so_snd.sb_mowner = &udp_tx_mowner; 1162 #endif 1163 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1164 error = soreserve(so, udp_sendspace, udp_recvspace); 1165 if (error) 1166 break; 1167 } 1168 error = in_pcballoc(so, &udbtable); 1169 if (error) 1170 break; 1171 inp = sotoinpcb(so); 1172 inp->inp_ip.ip_ttl = ip_defttl; 1173 break; 1174 1175 case PRU_DETACH: 1176 in_pcbdetach(inp); 1177 break; 1178 1179 case PRU_BIND: 1180 error = in_pcbbind(inp, nam, p); 1181 break; 1182 1183 case PRU_LISTEN: 1184 error = EOPNOTSUPP; 1185 break; 1186 1187 case PRU_CONNECT: 1188 error = in_pcbconnect(inp, nam); 1189 if (error) 1190 break; 1191 soisconnected(so); 1192 break; 1193 1194 case PRU_CONNECT2: 1195 error = EOPNOTSUPP; 1196 break; 1197 1198 case PRU_DISCONNECT: 1199 /*soisdisconnected(so);*/ 1200 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1201 in_pcbdisconnect(inp); 1202 inp->inp_laddr = zeroin_addr; /* XXX */ 1203 in_pcbstate(inp, INP_BOUND); /* XXX */ 1204 break; 1205 1206 case PRU_SHUTDOWN: 1207 socantsendmore(so); 1208 break; 1209 1210 case PRU_RCVD: 1211 error = EOPNOTSUPP; 1212 break; 1213 1214 case PRU_SEND: 1215 if (control && control->m_len) { 1216 m_freem(control); 1217 m_freem(m); 1218 error = EINVAL; 1219 break; 1220 } 1221 { 1222 struct in_addr laddr; /* XXX */ 1223 1224 if (nam) { 1225 laddr = inp->inp_laddr; /* XXX */ 1226 if ((so->so_state & SS_ISCONNECTED) != 0) { 1227 error = EISCONN; 1228 goto die; 1229 } 1230 error = in_pcbconnect(inp, nam); 1231 if (error) 1232 goto die; 1233 } else { 1234 if ((so->so_state & SS_ISCONNECTED) == 0) { 1235 error = ENOTCONN; 1236 goto die; 1237 } 1238 } 1239 error = udp_output(m, inp); 1240 m = NULL; 1241 if (nam) { 1242 in_pcbdisconnect(inp); 1243 inp->inp_laddr = laddr; /* XXX */ 1244 in_pcbstate(inp, INP_BOUND); /* XXX */ 1245 } 1246 die: 1247 if (m) 1248 m_freem(m); 1249 } 1250 break; 1251 1252 case PRU_SENSE: 1253 /* 1254 * stat: don't bother with a blocksize. 1255 */ 1256 splx(s); 1257 return (0); 1258 1259 case PRU_RCVOOB: 1260 error = EOPNOTSUPP; 1261 break; 1262 1263 case PRU_SENDOOB: 1264 m_freem(control); 1265 m_freem(m); 1266 error = EOPNOTSUPP; 1267 break; 1268 1269 case PRU_SOCKADDR: 1270 in_setsockaddr(inp, nam); 1271 break; 1272 1273 case PRU_PEERADDR: 1274 in_setpeeraddr(inp, nam); 1275 break; 1276 1277 default: 1278 panic("udp_usrreq"); 1279 } 1280 1281 release: 1282 splx(s); 1283 return (error); 1284 } 1285 1286 /* 1287 * Sysctl for udp variables. 1288 */ 1289 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1290 { 1291 1292 sysctl_createv(clog, 0, NULL, NULL, 1293 CTLFLAG_PERMANENT, 1294 CTLTYPE_NODE, "net", NULL, 1295 NULL, 0, NULL, 0, 1296 CTL_NET, CTL_EOL); 1297 sysctl_createv(clog, 0, NULL, NULL, 1298 CTLFLAG_PERMANENT, 1299 CTLTYPE_NODE, "inet", NULL, 1300 NULL, 0, NULL, 0, 1301 CTL_NET, PF_INET, CTL_EOL); 1302 sysctl_createv(clog, 0, NULL, NULL, 1303 CTLFLAG_PERMANENT, 1304 CTLTYPE_NODE, "udp", 1305 SYSCTL_DESCR("UDPv4 related settings"), 1306 NULL, 0, NULL, 0, 1307 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1308 1309 sysctl_createv(clog, 0, NULL, NULL, 1310 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1311 CTLTYPE_INT, "checksum", 1312 SYSCTL_DESCR("Compute UDP checksums"), 1313 NULL, 0, &udpcksum, 0, 1314 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1315 CTL_EOL); 1316 sysctl_createv(clog, 0, NULL, NULL, 1317 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1318 CTLTYPE_INT, "sendspace", 1319 SYSCTL_DESCR("Default UDP send buffer size"), 1320 NULL, 0, &udp_sendspace, 0, 1321 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1322 CTL_EOL); 1323 sysctl_createv(clog, 0, NULL, NULL, 1324 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1325 CTLTYPE_INT, "recvspace", 1326 SYSCTL_DESCR("Default UDP receive buffer size"), 1327 NULL, 0, &udp_recvspace, 0, 1328 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1329 CTL_EOL); 1330 sysctl_createv(clog, 0, NULL, NULL, 1331 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1332 CTLTYPE_INT, "do_loopback_cksum", 1333 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1334 NULL, 0, &udp_do_loopback_cksum, 0, 1335 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1336 CTL_EOL); 1337 sysctl_createv(clog, 0, NULL, NULL, 1338 CTLFLAG_PERMANENT, 1339 CTLTYPE_STRUCT, "pcblist", 1340 SYSCTL_DESCR("UDP protocol control block list"), 1341 sysctl_inpcblist, 0, &udbtable, 0, 1342 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1343 CTL_EOL); 1344 } 1345 #endif 1346 1347 #if (defined INET && defined IPSEC_NAT_T) 1348 /* 1349 * Returns: 1350 * 1 if the packet was processed 1351 * 0 if normal UDP processing should take place 1352 */ 1353 static int 1354 udp4_espinudp(m, off, src, so) 1355 struct mbuf *m; 1356 int off; 1357 struct sockaddr *src; 1358 struct socket *so; 1359 { 1360 size_t len; 1361 caddr_t data; 1362 struct inpcb *inp; 1363 size_t skip = 0; 1364 size_t minlen; 1365 size_t iphdrlen; 1366 struct ip *ip; 1367 struct mbuf *n; 1368 1369 /* 1370 * Collapse the mbuf chain if the first mbuf is too short 1371 * The longest case is: UDP + non ESP marker + ESP 1372 */ 1373 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1374 if (minlen > m->m_pkthdr.len) 1375 minlen = m->m_pkthdr.len; 1376 1377 if (m->m_len < minlen) { 1378 if ((m = m_pullup(m, minlen)) == NULL) { 1379 printf("udp4_espinudp: m_pullup failed\n"); 1380 return 0; 1381 } 1382 } 1383 1384 len = m->m_len - off; 1385 data = mtod(m, caddr_t) + off; 1386 inp = sotoinpcb(so); 1387 1388 /* Ignore keepalive packets */ 1389 if ((len == 1) && (data[0] == '\xff')) { 1390 return 1; 1391 } 1392 1393 /* 1394 * Check that the payload is long enough to hold 1395 * an ESP header and compute the length of encapsulation 1396 * header to remove 1397 */ 1398 if (inp->inp_flags & INP_ESPINUDP) { 1399 u_int32_t *st = (u_int32_t *)data; 1400 1401 if ((len <= sizeof(struct esp)) || (*st == 0)) 1402 return 0; /* Normal UDP processing */ 1403 1404 skip = sizeof(struct udphdr); 1405 } 1406 1407 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1408 u_int64_t *st = (u_int64_t *)data; 1409 1410 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1411 || (*st != 0)) 1412 return 0; /* Normal UDP processing */ 1413 1414 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1415 } 1416 1417 /* 1418 * Remove the UDP header (and possibly the non ESP marker) 1419 * IP header lendth is iphdrlen 1420 * Before: 1421 * <--- off ---> 1422 * +----+------+-----+ 1423 * | IP | UDP | ESP | 1424 * +----+------+-----+ 1425 * <-skip-> 1426 * After: 1427 * +----+-----+ 1428 * | IP | ESP | 1429 * +----+-----+ 1430 * <-skip-> 1431 */ 1432 iphdrlen = off - sizeof(struct udphdr); 1433 memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen); 1434 m_adj(m, skip); 1435 1436 ip = mtod(m, struct ip *); 1437 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1438 ip->ip_p = IPPROTO_ESP; 1439 1440 /* 1441 * Copy the mbuf to avoid multiple free, as both 1442 * esp4_input (which we call) and udp_input (which 1443 * called us) free the mbuf. 1444 */ 1445 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1446 printf("udp4_espinudp: m_dup failed\n"); 1447 return 0; 1448 } 1449 1450 esp4_input(n, iphdrlen); 1451 1452 /* We handled it, it shoudln't be handled by UDP */ 1453 return 1; 1454 } 1455 #endif 1456
Indexes created Sun Sep 21 20:09:37 GMT 2025