1 /* $NetBSD: udp_usrreq.c,v 1.156 2006/11/14 12:05:55 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 1.156 2006/11/14 12:05:55 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 INET6 99 #include <netinet/ip6.h> 100 #include <netinet/icmp6.h> 101 #include <netinet6/ip6_var.h> 102 #include <netinet6/in6_pcb.h> 103 #include <netinet6/udp6_var.h> 104 #include <netinet6/scope6_var.h> 105 #endif 106 107 #ifndef INET6 108 /* always need ip6.h for IP6_EXTHDR_GET */ 109 #include <netinet/ip6.h> 110 #endif 111 112 #include "faith.h" 113 #if defined(NFAITH) && NFAITH > 0 114 #include <net/if_faith.h> 115 #endif 116 117 #include <machine/stdarg.h> 118 119 #ifdef FAST_IPSEC 120 #include <netipsec/ipsec.h> 121 #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */ 122 #include <netipsec/esp.h> 123 #ifdef INET6 124 #include <netipsec/ipsec6.h> 125 #endif 126 #endif /* FAST_IPSEC*/ 127 128 #ifdef IPSEC 129 #include <netinet6/ipsec.h> 130 #include <netinet6/esp.h> 131 #include <netkey/key.h> 132 #endif /*IPSEC*/ 133 134 #ifdef IPKDB 135 #include <ipkdb/ipkdb.h> 136 #endif 137 138 /* 139 * UDP protocol implementation. 140 * Per RFC 768, August, 1980. 141 */ 142 int udpcksum = 1; 143 int udp_do_loopback_cksum = 0; 144 145 struct inpcbtable udbtable; 146 struct udpstat udpstat; 147 148 #ifdef INET 149 #ifdef IPSEC_NAT_T 150 static int udp4_espinudp (struct mbuf **, int, struct sockaddr *, 151 struct socket *); 152 #endif 153 static void udp4_sendup (struct mbuf *, int, struct sockaddr *, 154 struct socket *); 155 static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, 156 struct mbuf **, int); 157 static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); 158 #endif 159 #ifdef INET6 160 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 161 struct socket *); 162 static int udp6_realinput (int, struct sockaddr_in6 *, 163 struct sockaddr_in6 *, struct mbuf *, int); 164 static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int); 165 #endif 166 #ifdef INET 167 static void udp_notify (struct inpcb *, int); 168 #endif 169 170 #ifndef UDBHASHSIZE 171 #define UDBHASHSIZE 128 172 #endif 173 int udbhashsize = UDBHASHSIZE; 174 175 #ifdef MBUFTRACE 176 struct mowner udp_mowner = MOWNER_INIT("udp", ""); 177 struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx"); 178 struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx"); 179 #endif 180 181 #ifdef UDP_CSUM_COUNTERS 182 #include <sys/device.h> 183 184 #if defined(INET) 185 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 186 NULL, "udp", "hwcsum bad"); 187 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 188 NULL, "udp", "hwcsum ok"); 189 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 190 NULL, "udp", "hwcsum data"); 191 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 192 NULL, "udp", "swcsum"); 193 194 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 195 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 196 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 197 EVCNT_ATTACH_STATIC(udp_swcsum); 198 #endif /* defined(INET) */ 199 200 #if defined(INET6) 201 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 202 NULL, "udp6", "hwcsum bad"); 203 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 204 NULL, "udp6", "hwcsum ok"); 205 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 206 NULL, "udp6", "hwcsum data"); 207 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 208 NULL, "udp6", "swcsum"); 209 210 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 211 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 212 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 213 EVCNT_ATTACH_STATIC(udp6_swcsum); 214 #endif /* defined(INET6) */ 215 216 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 217 218 #else 219 220 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 221 222 #endif /* UDP_CSUM_COUNTERS */ 223 224 void 225 udp_init(void) 226 { 227 228 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 229 230 MOWNER_ATTACH(&udp_tx_mowner); 231 MOWNER_ATTACH(&udp_rx_mowner); 232 MOWNER_ATTACH(&udp_mowner); 233 } 234 235 /* 236 * Checksum extended UDP header and data. 237 */ 238 239 int 240 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 241 int iphlen, int len) 242 { 243 244 switch (af) { 245 #ifdef INET 246 case AF_INET: 247 return udp4_input_checksum(m, uh, iphlen, len); 248 #endif 249 #ifdef INET6 250 case AF_INET6: 251 return udp6_input_checksum(m, uh, iphlen, len); 252 #endif 253 } 254 #ifdef DIAGNOSTIC 255 panic("udp_input_checksum: unknown af %d", af); 256 #endif 257 /* NOTREACHED */ 258 return -1; 259 } 260 261 #ifdef INET 262 263 /* 264 * Checksum extended UDP header and data. 265 */ 266 267 static int 268 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 269 int iphlen, int len) 270 { 271 272 /* 273 * XXX it's better to record and check if this mbuf is 274 * already checked. 275 */ 276 277 if (uh->uh_sum == 0) 278 return 0; 279 280 switch (m->m_pkthdr.csum_flags & 281 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 282 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 283 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 284 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 285 goto badcsum; 286 287 case M_CSUM_UDPv4|M_CSUM_DATA: { 288 u_int32_t hw_csum = m->m_pkthdr.csum_data; 289 290 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 291 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 292 const struct ip *ip = 293 mtod(m, const struct ip *); 294 295 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 296 ip->ip_dst.s_addr, 297 htons(hw_csum + len + IPPROTO_UDP)); 298 } 299 if ((hw_csum ^ 0xffff) != 0) 300 goto badcsum; 301 break; 302 } 303 304 case M_CSUM_UDPv4: 305 /* Checksum was okay. */ 306 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 307 break; 308 309 default: 310 /* 311 * Need to compute it ourselves. Maybe skip checksum 312 * on loopback interfaces. 313 */ 314 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 315 IFF_LOOPBACK) || 316 udp_do_loopback_cksum)) { 317 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 318 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 319 goto badcsum; 320 } 321 break; 322 } 323 324 return 0; 325 326 badcsum: 327 udpstat.udps_badsum++; 328 return -1; 329 } 330 331 void 332 udp_input(struct mbuf *m, ...) 333 { 334 va_list ap; 335 struct sockaddr_in src, dst; 336 struct ip *ip; 337 struct udphdr *uh; 338 int iphlen; 339 int len; 340 int n; 341 u_int16_t ip_len; 342 343 va_start(ap, m); 344 iphlen = va_arg(ap, int); 345 (void)va_arg(ap, int); /* ignore value, advance ap */ 346 va_end(ap); 347 348 MCLAIM(m, &udp_rx_mowner); 349 udpstat.udps_ipackets++; 350 351 /* 352 * Get IP and UDP header together in first mbuf. 353 */ 354 ip = mtod(m, struct ip *); 355 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 356 if (uh == NULL) { 357 udpstat.udps_hdrops++; 358 return; 359 } 360 KASSERT(UDP_HDR_ALIGNED_P(uh)); 361 362 /* destination port of 0 is illegal, based on RFC768. */ 363 if (uh->uh_dport == 0) 364 goto bad; 365 366 /* 367 * Make mbuf data length reflect UDP length. 368 * If not enough data to reflect UDP length, drop. 369 */ 370 ip_len = ntohs(ip->ip_len); 371 len = ntohs((u_int16_t)uh->uh_ulen); 372 if (ip_len != iphlen + len) { 373 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 374 udpstat.udps_badlen++; 375 goto bad; 376 } 377 m_adj(m, iphlen + len - ip_len); 378 } 379 380 /* 381 * Checksum extended UDP header and data. 382 */ 383 if (udp4_input_checksum(m, uh, iphlen, len)) 384 goto badcsum; 385 386 /* construct source and dst sockaddrs. */ 387 bzero(&src, sizeof(src)); 388 src.sin_family = AF_INET; 389 src.sin_len = sizeof(struct sockaddr_in); 390 bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr)); 391 src.sin_port = uh->uh_sport; 392 bzero(&dst, sizeof(dst)); 393 dst.sin_family = AF_INET; 394 dst.sin_len = sizeof(struct sockaddr_in); 395 bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr)); 396 dst.sin_port = uh->uh_dport; 397 398 if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { 399 udpstat.udps_hdrops++; 400 return; 401 } 402 #ifdef INET6 403 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 404 struct sockaddr_in6 src6, dst6; 405 406 bzero(&src6, sizeof(src6)); 407 src6.sin6_family = AF_INET6; 408 src6.sin6_len = sizeof(struct sockaddr_in6); 409 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 410 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 411 sizeof(ip->ip_src)); 412 src6.sin6_port = uh->uh_sport; 413 bzero(&dst6, sizeof(dst6)); 414 dst6.sin6_family = AF_INET6; 415 dst6.sin6_len = sizeof(struct sockaddr_in6); 416 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 417 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 418 sizeof(ip->ip_dst)); 419 dst6.sin6_port = uh->uh_dport; 420 421 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 422 } 423 #endif 424 425 if (n == 0) { 426 if (m->m_flags & (M_BCAST | M_MCAST)) { 427 udpstat.udps_noportbcast++; 428 goto bad; 429 } 430 udpstat.udps_noport++; 431 #ifdef IPKDB 432 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 433 m, iphlen + sizeof(struct udphdr), 434 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 435 /* 436 * It was a debugger connect packet, 437 * just drop it now 438 */ 439 goto bad; 440 } 441 #endif 442 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 443 m = NULL; 444 } 445 446 bad: 447 if (m) 448 m_freem(m); 449 return; 450 451 badcsum: 452 m_freem(m); 453 } 454 #endif 455 456 #ifdef INET6 457 static int 458 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 459 { 460 461 /* 462 * XXX it's better to record and check if this mbuf is 463 * already checked. 464 */ 465 466 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 467 goto good; 468 } 469 if (uh->uh_sum == 0) { 470 udp6stat.udp6s_nosum++; 471 goto bad; 472 } 473 474 switch (m->m_pkthdr.csum_flags & 475 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 476 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 477 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 478 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 479 udp6stat.udp6s_badsum++; 480 goto bad; 481 482 #if 0 /* notyet */ 483 case M_CSUM_UDPv6|M_CSUM_DATA: 484 #endif 485 486 case M_CSUM_UDPv6: 487 /* Checksum was okay. */ 488 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 489 break; 490 491 default: 492 /* 493 * Need to compute it ourselves. Maybe skip checksum 494 * on loopback interfaces. 495 */ 496 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 497 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 498 udp6stat.udp6s_badsum++; 499 goto bad; 500 } 501 } 502 503 good: 504 return 0; 505 bad: 506 return -1; 507 } 508 509 int 510 udp6_input(struct mbuf **mp, int *offp, int proto) 511 { 512 struct mbuf *m = *mp; 513 int off = *offp; 514 struct sockaddr_in6 src, dst; 515 struct ip6_hdr *ip6; 516 struct udphdr *uh; 517 u_int32_t plen, ulen; 518 519 ip6 = mtod(m, struct ip6_hdr *); 520 521 #if defined(NFAITH) && 0 < NFAITH 522 if (faithprefix(&ip6->ip6_dst)) { 523 /* send icmp6 host unreach? */ 524 m_freem(m); 525 return IPPROTO_DONE; 526 } 527 #endif 528 529 udp6stat.udp6s_ipackets++; 530 531 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 532 plen = m->m_pkthdr.len - off; 533 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 534 if (uh == NULL) { 535 ip6stat.ip6s_tooshort++; 536 return IPPROTO_DONE; 537 } 538 KASSERT(UDP_HDR_ALIGNED_P(uh)); 539 ulen = ntohs((u_short)uh->uh_ulen); 540 /* 541 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 542 * iff payload length > 0xffff. 543 */ 544 if (ulen == 0 && plen > 0xffff) 545 ulen = plen; 546 547 if (plen != ulen) { 548 udp6stat.udp6s_badlen++; 549 goto bad; 550 } 551 552 /* destination port of 0 is illegal, based on RFC768. */ 553 if (uh->uh_dport == 0) 554 goto bad; 555 556 /* Be proactive about malicious use of IPv4 mapped address */ 557 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 558 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 559 /* XXX stat */ 560 goto bad; 561 } 562 563 /* 564 * Checksum extended UDP header and data. Maybe skip checksum 565 * on loopback interfaces. 566 */ 567 if (udp6_input_checksum(m, uh, off, ulen)) 568 goto bad; 569 570 /* 571 * Construct source and dst sockaddrs. 572 */ 573 bzero(&src, sizeof(src)); 574 src.sin6_family = AF_INET6; 575 src.sin6_len = sizeof(struct sockaddr_in6); 576 src.sin6_addr = ip6->ip6_src; 577 src.sin6_port = uh->uh_sport; 578 bzero(&dst, sizeof(dst)); 579 dst.sin6_family = AF_INET6; 580 dst.sin6_len = sizeof(struct sockaddr_in6); 581 dst.sin6_addr = ip6->ip6_dst; 582 dst.sin6_port = uh->uh_dport; 583 584 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 585 if (m->m_flags & M_MCAST) { 586 udp6stat.udp6s_noportmcast++; 587 goto bad; 588 } 589 udp6stat.udp6s_noport++; 590 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 591 m = NULL; 592 } 593 594 bad: 595 if (m) 596 m_freem(m); 597 return IPPROTO_DONE; 598 } 599 #endif 600 601 #ifdef INET 602 static void 603 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 604 struct sockaddr *src, struct socket *so) 605 { 606 struct mbuf *opts = NULL; 607 struct mbuf *n; 608 struct inpcb *inp = NULL; 609 610 if (!so) 611 return; 612 switch (so->so_proto->pr_domain->dom_family) { 613 case AF_INET: 614 inp = sotoinpcb(so); 615 break; 616 #ifdef INET6 617 case AF_INET6: 618 break; 619 #endif 620 default: 621 return; 622 } 623 624 #if defined(IPSEC) || defined(FAST_IPSEC) 625 /* check AH/ESP integrity. */ 626 if (so != NULL && ipsec4_in_reject_so(m, so)) { 627 ipsecstat.in_polvio++; 628 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 629 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 630 0, 0); 631 return; 632 } 633 #endif /*IPSEC*/ 634 635 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 636 if (inp && (inp->inp_flags & INP_CONTROLOPTS 637 || so->so_options & SO_TIMESTAMP)) { 638 struct ip *ip = mtod(n, struct ip *); 639 ip_savecontrol(inp, &opts, ip, n); 640 } 641 642 m_adj(n, off); 643 if (sbappendaddr(&so->so_rcv, src, n, 644 opts) == 0) { 645 m_freem(n); 646 if (opts) 647 m_freem(opts); 648 so->so_rcv.sb_overflowed++; 649 udpstat.udps_fullsock++; 650 } else 651 sorwakeup(so); 652 } 653 } 654 #endif 655 656 #ifdef INET6 657 static void 658 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 659 struct sockaddr *src, struct socket *so) 660 { 661 struct mbuf *opts = NULL; 662 struct mbuf *n; 663 struct in6pcb *in6p = NULL; 664 665 if (!so) 666 return; 667 if (so->so_proto->pr_domain->dom_family != AF_INET6) 668 return; 669 in6p = sotoin6pcb(so); 670 671 #if defined(IPSEC) || defined(FAST_IPSEC) 672 /* check AH/ESP integrity. */ 673 if (so != NULL && ipsec6_in_reject_so(m, so)) { 674 ipsec6stat.in_polvio++; 675 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 676 icmp6_error(n, ICMP6_DST_UNREACH, 677 ICMP6_DST_UNREACH_ADMIN, 0); 678 return; 679 } 680 #endif /*IPSEC*/ 681 682 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 683 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 684 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 685 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 686 ip6_savecontrol(in6p, &opts, ip6, n); 687 } 688 689 m_adj(n, off); 690 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 691 m_freem(n); 692 if (opts) 693 m_freem(opts); 694 so->so_rcv.sb_overflowed++; 695 udp6stat.udp6s_fullsock++; 696 } else 697 sorwakeup(so); 698 } 699 } 700 #endif 701 702 #ifdef INET 703 static int 704 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 705 struct mbuf **mp, int off /* offset of udphdr */) 706 { 707 u_int16_t *sport, *dport; 708 int rcvcnt; 709 struct in_addr *src4, *dst4; 710 struct inpcb_hdr *inph; 711 struct inpcb *inp; 712 struct mbuf *m = *mp; 713 714 rcvcnt = 0; 715 off += sizeof(struct udphdr); /* now, offset of payload */ 716 717 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 718 goto bad; 719 720 src4 = &src->sin_addr; 721 sport = &src->sin_port; 722 dst4 = &dst->sin_addr; 723 dport = &dst->sin_port; 724 725 if (IN_MULTICAST(dst4->s_addr) || 726 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 727 /* 728 * Deliver a multicast or broadcast datagram to *all* sockets 729 * for which the local and remote addresses and ports match 730 * those of the incoming datagram. This allows more than 731 * one process to receive multi/broadcasts on the same port. 732 * (This really ought to be done for unicast datagrams as 733 * well, but that would cause problems with existing 734 * applications that open both address-specific sockets and 735 * a wildcard socket listening to the same port -- they would 736 * end up receiving duplicates of every unicast datagram. 737 * Those applications open the multiple sockets to overcome an 738 * inadequacy of the UDP socket interface, but for backwards 739 * compatibility we avoid the problem here rather than 740 * fixing the interface. Maybe 4.5BSD will remedy this?) 741 */ 742 743 /* 744 * KAME note: traditionally we dropped udpiphdr from mbuf here. 745 * we need udpiphdr for IPsec processing so we do that later. 746 */ 747 /* 748 * Locate pcb(s) for datagram. 749 */ 750 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 751 inp = (struct inpcb *)inph; 752 if (inp->inp_af != AF_INET) 753 continue; 754 755 if (inp->inp_lport != *dport) 756 continue; 757 if (!in_nullhost(inp->inp_laddr)) { 758 if (!in_hosteq(inp->inp_laddr, *dst4)) 759 continue; 760 } 761 if (!in_nullhost(inp->inp_faddr)) { 762 if (!in_hosteq(inp->inp_faddr, *src4) || 763 inp->inp_fport != *sport) 764 continue; 765 } 766 767 udp4_sendup(m, off, (struct sockaddr *)src, 768 inp->inp_socket); 769 rcvcnt++; 770 771 /* 772 * Don't look for additional matches if this one does 773 * not have either the SO_REUSEPORT or SO_REUSEADDR 774 * socket options set. This heuristic avoids searching 775 * through all pcbs in the common case of a non-shared 776 * port. It assumes that an application will never 777 * clear these options after setting them. 778 */ 779 if ((inp->inp_socket->so_options & 780 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 781 break; 782 } 783 } else { 784 /* 785 * Locate pcb for datagram. 786 */ 787 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 788 if (inp == 0) { 789 ++udpstat.udps_pcbhashmiss; 790 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 791 if (inp == 0) 792 return rcvcnt; 793 } 794 795 #ifdef IPSEC_NAT_T 796 /* Handle ESP over UDP */ 797 if (inp->inp_flags & INP_ESPINUDP_ALL) { 798 struct sockaddr *sa = (struct sockaddr *)src; 799 800 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 801 case -1: /* Error, m was freeed */ 802 rcvcnt = -1; 803 goto bad; 804 break; 805 806 case 1: /* ESP over UDP */ 807 rcvcnt++; 808 goto bad; 809 break; 810 811 case 0: /* plain UDP */ 812 default: /* Unexpected */ 813 /* 814 * Normal UDP processing will take place 815 * m may have changed. 816 */ 817 m = *mp; 818 break; 819 } 820 } 821 #endif 822 823 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 824 rcvcnt++; 825 } 826 827 bad: 828 return rcvcnt; 829 } 830 #endif 831 832 #ifdef INET6 833 static int 834 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 835 struct mbuf *m, int off) 836 { 837 u_int16_t sport, dport; 838 int rcvcnt; 839 struct in6_addr src6, *dst6; 840 const struct in_addr *dst4; 841 struct inpcb_hdr *inph; 842 struct in6pcb *in6p; 843 844 rcvcnt = 0; 845 off += sizeof(struct udphdr); /* now, offset of payload */ 846 847 if (af != AF_INET && af != AF_INET6) 848 goto bad; 849 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 850 goto bad; 851 852 src6 = src->sin6_addr; 853 if (sa6_recoverscope(src) != 0) { 854 /* XXX: should be impossible. */ 855 goto bad; 856 } 857 sport = src->sin6_port; 858 859 dport = dst->sin6_port; 860 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 861 dst6 = &dst->sin6_addr; 862 863 if (IN6_IS_ADDR_MULTICAST(dst6) || 864 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 865 /* 866 * Deliver a multicast or broadcast datagram to *all* sockets 867 * for which the local and remote addresses and ports match 868 * those of the incoming datagram. This allows more than 869 * one process to receive multi/broadcasts on the same port. 870 * (This really ought to be done for unicast datagrams as 871 * well, but that would cause problems with existing 872 * applications that open both address-specific sockets and 873 * a wildcard socket listening to the same port -- they would 874 * end up receiving duplicates of every unicast datagram. 875 * Those applications open the multiple sockets to overcome an 876 * inadequacy of the UDP socket interface, but for backwards 877 * compatibility we avoid the problem here rather than 878 * fixing the interface. Maybe 4.5BSD will remedy this?) 879 */ 880 881 /* 882 * KAME note: traditionally we dropped udpiphdr from mbuf here. 883 * we need udpiphdr for IPsec processing so we do that later. 884 */ 885 /* 886 * Locate pcb(s) for datagram. 887 */ 888 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 889 in6p = (struct in6pcb *)inph; 890 if (in6p->in6p_af != AF_INET6) 891 continue; 892 893 if (in6p->in6p_lport != dport) 894 continue; 895 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 896 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 897 dst6)) 898 continue; 899 } else { 900 if (IN6_IS_ADDR_V4MAPPED(dst6) && 901 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 902 continue; 903 } 904 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 905 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 906 &src6) || in6p->in6p_fport != sport) 907 continue; 908 } else { 909 if (IN6_IS_ADDR_V4MAPPED(&src6) && 910 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 911 continue; 912 } 913 914 udp6_sendup(m, off, (struct sockaddr *)src, 915 in6p->in6p_socket); 916 rcvcnt++; 917 918 /* 919 * Don't look for additional matches if this one does 920 * not have either the SO_REUSEPORT or SO_REUSEADDR 921 * socket options set. This heuristic avoids searching 922 * through all pcbs in the common case of a non-shared 923 * port. It assumes that an application will never 924 * clear these options after setting them. 925 */ 926 if ((in6p->in6p_socket->so_options & 927 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 928 break; 929 } 930 } else { 931 /* 932 * Locate pcb for datagram. 933 */ 934 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 935 dport, 0); 936 if (in6p == 0) { 937 ++udpstat.udps_pcbhashmiss; 938 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 939 if (in6p == 0) 940 return rcvcnt; 941 } 942 943 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 944 rcvcnt++; 945 } 946 947 bad: 948 return rcvcnt; 949 } 950 #endif 951 952 #ifdef INET 953 /* 954 * Notify a udp user of an asynchronous error; 955 * just wake up so that he can collect error status. 956 */ 957 static void 958 udp_notify(struct inpcb *inp, int errno) 959 { 960 inp->inp_socket->so_error = errno; 961 sorwakeup(inp->inp_socket); 962 sowwakeup(inp->inp_socket); 963 } 964 965 void * 966 udp_ctlinput(int cmd, struct sockaddr *sa, void *v) 967 { 968 struct ip *ip = v; 969 struct udphdr *uh; 970 void (*notify)(struct inpcb *, int) = udp_notify; 971 int errno; 972 973 if (sa->sa_family != AF_INET 974 || sa->sa_len != sizeof(struct sockaddr_in)) 975 return NULL; 976 if ((unsigned)cmd >= PRC_NCMDS) 977 return NULL; 978 errno = inetctlerrmap[cmd]; 979 if (PRC_IS_REDIRECT(cmd)) 980 notify = in_rtchange, ip = 0; 981 else if (cmd == PRC_HOSTDEAD) 982 ip = 0; 983 else if (errno == 0) 984 return NULL; 985 if (ip) { 986 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 987 in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, 988 ip->ip_src, uh->uh_sport, errno, notify); 989 990 /* XXX mapped address case */ 991 } else 992 in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, 993 notify); 994 return NULL; 995 } 996 997 int 998 udp_ctloutput(int op, struct socket *so, int level, int optname, 999 struct mbuf **mp) 1000 { 1001 int s; 1002 int error = 0; 1003 struct mbuf *m; 1004 struct inpcb *inp; 1005 int family; 1006 1007 family = so->so_proto->pr_domain->dom_family; 1008 1009 s = splsoftnet(); 1010 switch (family) { 1011 #ifdef INET 1012 case PF_INET: 1013 if (level != IPPROTO_UDP) { 1014 error = ip_ctloutput(op, so, level, optname, mp); 1015 goto end; 1016 } 1017 break; 1018 #endif 1019 #ifdef INET6 1020 case PF_INET6: 1021 if (level != IPPROTO_UDP) { 1022 error = ip6_ctloutput(op, so, level, optname, mp); 1023 goto end; 1024 } 1025 break; 1026 #endif 1027 default: 1028 error = EAFNOSUPPORT; 1029 goto end; 1030 } 1031 1032 1033 switch (op) { 1034 case PRCO_SETOPT: 1035 m = *mp; 1036 inp = sotoinpcb(so); 1037 1038 switch (optname) { 1039 case UDP_ENCAP: 1040 if (m == NULL || m->m_len < sizeof (int)) { 1041 error = EINVAL; 1042 break; 1043 } 1044 1045 switch(*mtod(m, int *)) { 1046 #ifdef IPSEC_NAT_T 1047 case 0: 1048 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1049 break; 1050 1051 case UDP_ENCAP_ESPINUDP: 1052 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1053 inp->inp_flags |= INP_ESPINUDP; 1054 break; 1055 1056 case UDP_ENCAP_ESPINUDP_NON_IKE: 1057 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1058 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1059 break; 1060 #endif 1061 default: 1062 error = EINVAL; 1063 break; 1064 } 1065 break; 1066 1067 default: 1068 error = ENOPROTOOPT; 1069 break; 1070 } 1071 if (m != NULL) { 1072 m_free(m); 1073 } 1074 break; 1075 1076 default: 1077 error = EINVAL; 1078 break; 1079 } 1080 1081 end: 1082 splx(s); 1083 return error; 1084 } 1085 1086 1087 int 1088 udp_output(struct mbuf *m, ...) 1089 { 1090 struct inpcb *inp; 1091 struct udpiphdr *ui; 1092 struct route *ro; 1093 int len = m->m_pkthdr.len; 1094 int error = 0; 1095 va_list ap; 1096 1097 MCLAIM(m, &udp_tx_mowner); 1098 va_start(ap, m); 1099 inp = va_arg(ap, struct inpcb *); 1100 va_end(ap); 1101 1102 /* 1103 * Calculate data length and get a mbuf 1104 * for UDP and IP headers. 1105 */ 1106 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1107 if (m == 0) { 1108 error = ENOBUFS; 1109 goto release; 1110 } 1111 1112 /* 1113 * Compute the packet length of the IP header, and 1114 * punt if the length looks bogus. 1115 */ 1116 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1117 error = EMSGSIZE; 1118 goto release; 1119 } 1120 1121 /* 1122 * Fill in mbuf with extended UDP header 1123 * and addresses and length put into network format. 1124 */ 1125 ui = mtod(m, struct udpiphdr *); 1126 ui->ui_pr = IPPROTO_UDP; 1127 ui->ui_src = inp->inp_laddr; 1128 ui->ui_dst = inp->inp_faddr; 1129 ui->ui_sport = inp->inp_lport; 1130 ui->ui_dport = inp->inp_fport; 1131 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1132 1133 ro = &inp->inp_route; 1134 1135 /* 1136 * Set up checksum and output datagram. 1137 */ 1138 if (udpcksum) { 1139 /* 1140 * XXX Cache pseudo-header checksum part for 1141 * XXX "connected" UDP sockets. 1142 */ 1143 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1144 ui->ui_dst.s_addr, htons((u_int16_t)len + 1145 sizeof(struct udphdr) + IPPROTO_UDP)); 1146 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1147 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1148 } else 1149 ui->ui_sum = 0; 1150 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1151 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1152 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1153 udpstat.udps_opackets++; 1154 1155 return (ip_output(m, inp->inp_options, ro, 1156 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1157 inp->inp_moptions, inp->inp_socket)); 1158 1159 release: 1160 m_freem(m); 1161 return (error); 1162 } 1163 1164 int udp_sendspace = 9216; /* really max datagram size */ 1165 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1166 /* 40 1K datagrams */ 1167 1168 /*ARGSUSED*/ 1169 int 1170 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1171 struct mbuf *control, struct lwp *l) 1172 { 1173 struct inpcb *inp; 1174 int s; 1175 int error = 0; 1176 1177 if (req == PRU_CONTROL) 1178 return (in_control(so, (long)m, (caddr_t)nam, 1179 (struct ifnet *)control, l)); 1180 1181 s = splsoftnet(); 1182 1183 if (req == PRU_PURGEIF) { 1184 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1185 in_purgeif((struct ifnet *)control); 1186 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1187 splx(s); 1188 return (0); 1189 } 1190 1191 inp = sotoinpcb(so); 1192 #ifdef DIAGNOSTIC 1193 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1194 panic("udp_usrreq: unexpected control mbuf"); 1195 #endif 1196 if (inp == 0 && req != PRU_ATTACH) { 1197 error = EINVAL; 1198 goto release; 1199 } 1200 1201 /* 1202 * Note: need to block udp_input while changing 1203 * the udp pcb queue and/or pcb addresses. 1204 */ 1205 switch (req) { 1206 1207 case PRU_ATTACH: 1208 if (inp != 0) { 1209 error = EISCONN; 1210 break; 1211 } 1212 #ifdef MBUFTRACE 1213 so->so_mowner = &udp_mowner; 1214 so->so_rcv.sb_mowner = &udp_rx_mowner; 1215 so->so_snd.sb_mowner = &udp_tx_mowner; 1216 #endif 1217 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1218 error = soreserve(so, udp_sendspace, udp_recvspace); 1219 if (error) 1220 break; 1221 } 1222 error = in_pcballoc(so, &udbtable); 1223 if (error) 1224 break; 1225 inp = sotoinpcb(so); 1226 inp->inp_ip.ip_ttl = ip_defttl; 1227 break; 1228 1229 case PRU_DETACH: 1230 in_pcbdetach(inp); 1231 break; 1232 1233 case PRU_BIND: 1234 error = in_pcbbind(inp, nam, l); 1235 break; 1236 1237 case PRU_LISTEN: 1238 error = EOPNOTSUPP; 1239 break; 1240 1241 case PRU_CONNECT: 1242 error = in_pcbconnect(inp, nam, l); 1243 if (error) 1244 break; 1245 soisconnected(so); 1246 break; 1247 1248 case PRU_CONNECT2: 1249 error = EOPNOTSUPP; 1250 break; 1251 1252 case PRU_DISCONNECT: 1253 /*soisdisconnected(so);*/ 1254 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1255 in_pcbdisconnect(inp); 1256 inp->inp_laddr = zeroin_addr; /* XXX */ 1257 in_pcbstate(inp, INP_BOUND); /* XXX */ 1258 break; 1259 1260 case PRU_SHUTDOWN: 1261 socantsendmore(so); 1262 break; 1263 1264 case PRU_RCVD: 1265 error = EOPNOTSUPP; 1266 break; 1267 1268 case PRU_SEND: 1269 if (control && control->m_len) { 1270 m_freem(control); 1271 m_freem(m); 1272 error = EINVAL; 1273 break; 1274 } 1275 { 1276 struct in_addr laddr; /* XXX */ 1277 1278 if (nam) { 1279 laddr = inp->inp_laddr; /* XXX */ 1280 if ((so->so_state & SS_ISCONNECTED) != 0) { 1281 error = EISCONN; 1282 goto die; 1283 } 1284 error = in_pcbconnect(inp, nam, l); 1285 if (error) 1286 goto die; 1287 } else { 1288 if ((so->so_state & SS_ISCONNECTED) == 0) { 1289 error = ENOTCONN; 1290 goto die; 1291 } 1292 } 1293 error = udp_output(m, inp); 1294 m = NULL; 1295 if (nam) { 1296 in_pcbdisconnect(inp); 1297 inp->inp_laddr = laddr; /* XXX */ 1298 in_pcbstate(inp, INP_BOUND); /* XXX */ 1299 } 1300 die: 1301 if (m) 1302 m_freem(m); 1303 } 1304 break; 1305 1306 case PRU_SENSE: 1307 /* 1308 * stat: don't bother with a blocksize. 1309 */ 1310 splx(s); 1311 return (0); 1312 1313 case PRU_RCVOOB: 1314 error = EOPNOTSUPP; 1315 break; 1316 1317 case PRU_SENDOOB: 1318 m_freem(control); 1319 m_freem(m); 1320 error = EOPNOTSUPP; 1321 break; 1322 1323 case PRU_SOCKADDR: 1324 in_setsockaddr(inp, nam); 1325 break; 1326 1327 case PRU_PEERADDR: 1328 in_setpeeraddr(inp, nam); 1329 break; 1330 1331 default: 1332 panic("udp_usrreq"); 1333 } 1334 1335 release: 1336 splx(s); 1337 return (error); 1338 } 1339 1340 /* 1341 * Sysctl for udp variables. 1342 */ 1343 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1344 { 1345 1346 sysctl_createv(clog, 0, NULL, NULL, 1347 CTLFLAG_PERMANENT, 1348 CTLTYPE_NODE, "net", NULL, 1349 NULL, 0, NULL, 0, 1350 CTL_NET, CTL_EOL); 1351 sysctl_createv(clog, 0, NULL, NULL, 1352 CTLFLAG_PERMANENT, 1353 CTLTYPE_NODE, "inet", NULL, 1354 NULL, 0, NULL, 0, 1355 CTL_NET, PF_INET, CTL_EOL); 1356 sysctl_createv(clog, 0, NULL, NULL, 1357 CTLFLAG_PERMANENT, 1358 CTLTYPE_NODE, "udp", 1359 SYSCTL_DESCR("UDPv4 related settings"), 1360 NULL, 0, NULL, 0, 1361 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1362 1363 sysctl_createv(clog, 0, NULL, NULL, 1364 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1365 CTLTYPE_INT, "checksum", 1366 SYSCTL_DESCR("Compute UDP checksums"), 1367 NULL, 0, &udpcksum, 0, 1368 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1369 CTL_EOL); 1370 sysctl_createv(clog, 0, NULL, NULL, 1371 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1372 CTLTYPE_INT, "sendspace", 1373 SYSCTL_DESCR("Default UDP send buffer size"), 1374 NULL, 0, &udp_sendspace, 0, 1375 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1376 CTL_EOL); 1377 sysctl_createv(clog, 0, NULL, NULL, 1378 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1379 CTLTYPE_INT, "recvspace", 1380 SYSCTL_DESCR("Default UDP receive buffer size"), 1381 NULL, 0, &udp_recvspace, 0, 1382 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1383 CTL_EOL); 1384 sysctl_createv(clog, 0, NULL, NULL, 1385 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1386 CTLTYPE_INT, "do_loopback_cksum", 1387 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1388 NULL, 0, &udp_do_loopback_cksum, 0, 1389 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1390 CTL_EOL); 1391 sysctl_createv(clog, 0, NULL, NULL, 1392 CTLFLAG_PERMANENT, 1393 CTLTYPE_STRUCT, "pcblist", 1394 SYSCTL_DESCR("UDP protocol control block list"), 1395 sysctl_inpcblist, 0, &udbtable, 0, 1396 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1397 CTL_EOL); 1398 sysctl_createv(clog, 0, NULL, NULL, 1399 CTLFLAG_PERMANENT, 1400 CTLTYPE_STRUCT, "stats", 1401 SYSCTL_DESCR("UDP statistics"), 1402 NULL, 0, &udpstat, sizeof(udpstat), 1403 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1404 CTL_EOL); 1405 } 1406 #endif 1407 1408 #if (defined INET && defined IPSEC_NAT_T) 1409 /* 1410 * Returns: 1411 * 1 if the packet was processed 1412 * 0 if normal UDP processing should take place 1413 * -1 if an error occurent and m was freed 1414 */ 1415 static int 1416 udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src, 1417 struct socket *so) 1418 { 1419 size_t len; 1420 caddr_t data; 1421 struct inpcb *inp; 1422 size_t skip = 0; 1423 size_t minlen; 1424 size_t iphdrlen; 1425 struct ip *ip; 1426 struct mbuf *n; 1427 struct m_tag *tag; 1428 struct udphdr *udphdr; 1429 u_int16_t sport, dport; 1430 struct mbuf *m = *mp; 1431 1432 /* 1433 * Collapse the mbuf chain if the first mbuf is too short 1434 * The longest case is: UDP + non ESP marker + ESP 1435 */ 1436 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1437 if (minlen > m->m_pkthdr.len) 1438 minlen = m->m_pkthdr.len; 1439 1440 if (m->m_len < minlen) { 1441 if ((*mp = m_pullup(m, minlen)) == NULL) { 1442 printf("udp4_espinudp: m_pullup failed\n"); 1443 return -1; 1444 } 1445 m = *mp; 1446 } 1447 1448 len = m->m_len - off; 1449 data = mtod(m, caddr_t) + off; 1450 inp = sotoinpcb(so); 1451 1452 /* Ignore keepalive packets */ 1453 if ((len == 1) && (data[0] == '\xff')) { 1454 return 1; 1455 } 1456 1457 /* 1458 * Check that the payload is long enough to hold 1459 * an ESP header and compute the length of encapsulation 1460 * header to remove 1461 */ 1462 if (inp->inp_flags & INP_ESPINUDP) { 1463 u_int32_t *st = (u_int32_t *)data; 1464 1465 if ((len <= sizeof(struct esp)) || (*st == 0)) 1466 return 0; /* Normal UDP processing */ 1467 1468 skip = sizeof(struct udphdr); 1469 } 1470 1471 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1472 u_int32_t *st = (u_int32_t *)data; 1473 1474 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1475 || ((st[0] | st[1]) != 0)) 1476 return 0; /* Normal UDP processing */ 1477 1478 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1479 } 1480 1481 /* 1482 * Get the UDP ports. They are handled in network 1483 * order everywhere in IPSEC_NAT_T code. 1484 */ 1485 udphdr = (struct udphdr *)(data - skip); 1486 sport = udphdr->uh_sport; 1487 dport = udphdr->uh_dport; 1488 1489 /* 1490 * Remove the UDP header (and possibly the non ESP marker) 1491 * IP header lendth is iphdrlen 1492 * Before: 1493 * <--- off ---> 1494 * +----+------+-----+ 1495 * | IP | UDP | ESP | 1496 * +----+------+-----+ 1497 * <-skip-> 1498 * After: 1499 * +----+-----+ 1500 * | IP | ESP | 1501 * +----+-----+ 1502 * <-skip-> 1503 */ 1504 iphdrlen = off - sizeof(struct udphdr); 1505 memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen); 1506 m_adj(m, skip); 1507 1508 ip = mtod(m, struct ip *); 1509 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1510 ip->ip_p = IPPROTO_ESP; 1511 1512 /* 1513 * Copy the mbuf to avoid multiple free, as both 1514 * esp4_input (which we call) and udp_input (which 1515 * called us) free the mbuf. 1516 */ 1517 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1518 printf("udp4_espinudp: m_dup failed\n"); 1519 return 0; 1520 } 1521 1522 /* 1523 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1524 * the source UDP port. This is required if we want 1525 * to select the right SPD for multiple hosts behind 1526 * same NAT 1527 */ 1528 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1529 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1530 printf("udp4_espinudp: m_tag_get failed\n"); 1531 m_freem(n); 1532 return 0; 1533 } 1534 ((u_int16_t *)(tag + 1))[0] = sport; 1535 ((u_int16_t *)(tag + 1))[1] = dport; 1536 m_tag_prepend(n, tag); 1537 1538 #ifdef FAST_IPSEC 1539 ipsec4_common_input(n, iphdrlen); 1540 #else 1541 esp4_input(n, iphdrlen); 1542 #endif 1543 1544 /* We handled it, it shoudln't be handled by UDP */ 1545 return 1; 1546 } 1547 #endif 1548