1 /* $NetBSD: udp_usrreq.c,v 1.173 2008/08/06 15:01:23 plunky 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 1.173 2008/08/06 15:01:23 plunky 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 #include <netinet/udp_private.h> 98 99 #ifdef INET6 100 #include <netinet/ip6.h> 101 #include <netinet/icmp6.h> 102 #include <netinet6/ip6_var.h> 103 #include <netinet6/ip6_private.h> 104 #include <netinet6/in6_pcb.h> 105 #include <netinet6/udp6_var.h> 106 #include <netinet6/udp6_private.h> 107 #include <netinet6/scope6_var.h> 108 #endif 109 110 #ifndef INET6 111 /* always need ip6.h for IP6_EXTHDR_GET */ 112 #include <netinet/ip6.h> 113 #endif 114 115 #include "faith.h" 116 #if defined(NFAITH) && NFAITH > 0 117 #include <net/if_faith.h> 118 #endif 119 120 #include <machine/stdarg.h> 121 122 #ifdef FAST_IPSEC 123 #include <netipsec/ipsec.h> 124 #include <netipsec/ipsec_var.h> 125 #include <netipsec/ipsec_private.h> 126 #include <netipsec/esp.h> 127 #ifdef INET6 128 #include <netipsec/ipsec6.h> 129 #endif 130 #endif /* FAST_IPSEC */ 131 132 #ifdef IPSEC 133 #include <netinet6/ipsec.h> 134 #include <netinet6/ipsec_private.h> 135 #include <netinet6/esp.h> 136 #include <netkey/key.h> 137 #endif /* IPSEC */ 138 139 #ifdef IPKDB 140 #include <ipkdb/ipkdb.h> 141 #endif 142 143 /* 144 * UDP protocol implementation. 145 * Per RFC 768, August, 1980. 146 */ 147 int udpcksum = 1; 148 int udp_do_loopback_cksum = 0; 149 150 struct inpcbtable udbtable; 151 152 percpu_t *udpstat_percpu; 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 = MOWNER_INIT("udp", ""); 183 struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx"); 184 struct mowner udp_tx_mowner = MOWNER_INIT("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 #ifdef INET 241 udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS); 242 #endif 243 #ifdef INET6 244 udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS); 245 #endif 246 } 247 248 /* 249 * Checksum extended UDP header and data. 250 */ 251 252 int 253 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 254 int iphlen, int len) 255 { 256 257 switch (af) { 258 #ifdef INET 259 case AF_INET: 260 return udp4_input_checksum(m, uh, iphlen, len); 261 #endif 262 #ifdef INET6 263 case AF_INET6: 264 return udp6_input_checksum(m, uh, iphlen, len); 265 #endif 266 } 267 #ifdef DIAGNOSTIC 268 panic("udp_input_checksum: unknown af %d", af); 269 #endif 270 /* NOTREACHED */ 271 return -1; 272 } 273 274 #ifdef INET 275 276 /* 277 * Checksum extended UDP header and data. 278 */ 279 280 static int 281 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 282 int iphlen, int len) 283 { 284 285 /* 286 * XXX it's better to record and check if this mbuf is 287 * already checked. 288 */ 289 290 if (uh->uh_sum == 0) 291 return 0; 292 293 switch (m->m_pkthdr.csum_flags & 294 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 295 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 296 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 297 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 298 goto badcsum; 299 300 case M_CSUM_UDPv4|M_CSUM_DATA: { 301 u_int32_t hw_csum = m->m_pkthdr.csum_data; 302 303 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 304 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 305 const struct ip *ip = 306 mtod(m, const struct ip *); 307 308 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 309 ip->ip_dst.s_addr, 310 htons(hw_csum + len + IPPROTO_UDP)); 311 } 312 if ((hw_csum ^ 0xffff) != 0) 313 goto badcsum; 314 break; 315 } 316 317 case M_CSUM_UDPv4: 318 /* Checksum was okay. */ 319 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 320 break; 321 322 default: 323 /* 324 * Need to compute it ourselves. Maybe skip checksum 325 * on loopback interfaces. 326 */ 327 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 328 IFF_LOOPBACK) || 329 udp_do_loopback_cksum)) { 330 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 331 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 332 goto badcsum; 333 } 334 break; 335 } 336 337 return 0; 338 339 badcsum: 340 UDP_STATINC(UDP_STAT_BADSUM); 341 return -1; 342 } 343 344 void 345 udp_input(struct mbuf *m, ...) 346 { 347 va_list ap; 348 struct sockaddr_in src, dst; 349 struct ip *ip; 350 struct udphdr *uh; 351 int iphlen; 352 int len; 353 int n; 354 u_int16_t ip_len; 355 356 va_start(ap, m); 357 iphlen = va_arg(ap, int); 358 (void)va_arg(ap, int); /* ignore value, advance ap */ 359 va_end(ap); 360 361 MCLAIM(m, &udp_rx_mowner); 362 UDP_STATINC(UDP_STAT_IPACKETS); 363 364 /* 365 * Get IP and UDP header together in first mbuf. 366 */ 367 ip = mtod(m, struct ip *); 368 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 369 if (uh == NULL) { 370 UDP_STATINC(UDP_STAT_HDROPS); 371 return; 372 } 373 KASSERT(UDP_HDR_ALIGNED_P(uh)); 374 375 /* destination port of 0 is illegal, based on RFC768. */ 376 if (uh->uh_dport == 0) 377 goto bad; 378 379 /* 380 * Make mbuf data length reflect UDP length. 381 * If not enough data to reflect UDP length, drop. 382 */ 383 ip_len = ntohs(ip->ip_len); 384 len = ntohs((u_int16_t)uh->uh_ulen); 385 if (ip_len != iphlen + len) { 386 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 387 UDP_STATINC(UDP_STAT_BADLEN); 388 goto bad; 389 } 390 m_adj(m, iphlen + len - ip_len); 391 } 392 393 /* 394 * Checksum extended UDP header and data. 395 */ 396 if (udp4_input_checksum(m, uh, iphlen, len)) 397 goto badcsum; 398 399 /* construct source and dst sockaddrs. */ 400 sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport); 401 sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport); 402 403 if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { 404 UDP_STATINC(UDP_STAT_HDROPS); 405 return; 406 } 407 #ifdef INET6 408 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 409 struct sockaddr_in6 src6, dst6; 410 411 bzero(&src6, sizeof(src6)); 412 src6.sin6_family = AF_INET6; 413 src6.sin6_len = sizeof(struct sockaddr_in6); 414 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 415 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 416 sizeof(ip->ip_src)); 417 src6.sin6_port = uh->uh_sport; 418 bzero(&dst6, sizeof(dst6)); 419 dst6.sin6_family = AF_INET6; 420 dst6.sin6_len = sizeof(struct sockaddr_in6); 421 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 422 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 423 sizeof(ip->ip_dst)); 424 dst6.sin6_port = uh->uh_dport; 425 426 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 427 } 428 #endif 429 430 if (n == 0) { 431 if (m->m_flags & (M_BCAST | M_MCAST)) { 432 UDP_STATINC(UDP_STAT_NOPORTBCAST); 433 goto bad; 434 } 435 UDP_STATINC(UDP_STAT_NOPORT); 436 #ifdef IPKDB 437 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 438 m, iphlen + sizeof(struct udphdr), 439 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 440 /* 441 * It was a debugger connect packet, 442 * just drop it now 443 */ 444 goto bad; 445 } 446 #endif 447 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 448 m = NULL; 449 } 450 451 bad: 452 if (m) 453 m_freem(m); 454 return; 455 456 badcsum: 457 m_freem(m); 458 } 459 #endif 460 461 #ifdef INET6 462 static int 463 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 464 { 465 466 /* 467 * XXX it's better to record and check if this mbuf is 468 * already checked. 469 */ 470 471 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 472 goto good; 473 } 474 if (uh->uh_sum == 0) { 475 UDP6_STATINC(UDP6_STAT_NOSUM); 476 goto bad; 477 } 478 479 switch (m->m_pkthdr.csum_flags & 480 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 481 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 482 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 483 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 484 UDP6_STATINC(UDP6_STAT_BADSUM); 485 goto bad; 486 487 #if 0 /* notyet */ 488 case M_CSUM_UDPv6|M_CSUM_DATA: 489 #endif 490 491 case M_CSUM_UDPv6: 492 /* Checksum was okay. */ 493 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 494 break; 495 496 default: 497 /* 498 * Need to compute it ourselves. Maybe skip checksum 499 * on loopback interfaces. 500 */ 501 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 502 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 503 UDP6_STATINC(UDP6_STAT_BADSUM); 504 goto bad; 505 } 506 } 507 508 good: 509 return 0; 510 bad: 511 return -1; 512 } 513 514 int 515 udp6_input(struct mbuf **mp, int *offp, int proto) 516 { 517 struct mbuf *m = *mp; 518 int off = *offp; 519 struct sockaddr_in6 src, dst; 520 struct ip6_hdr *ip6; 521 struct udphdr *uh; 522 u_int32_t plen, ulen; 523 524 ip6 = mtod(m, struct ip6_hdr *); 525 526 #if defined(NFAITH) && 0 < NFAITH 527 if (faithprefix(&ip6->ip6_dst)) { 528 /* send icmp6 host unreach? */ 529 m_freem(m); 530 return IPPROTO_DONE; 531 } 532 #endif 533 534 UDP6_STATINC(UDP6_STAT_IPACKETS); 535 536 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 537 plen = m->m_pkthdr.len - off; 538 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 539 if (uh == NULL) { 540 IP6_STATINC(IP6_STAT_TOOSHORT); 541 return IPPROTO_DONE; 542 } 543 KASSERT(UDP_HDR_ALIGNED_P(uh)); 544 ulen = ntohs((u_short)uh->uh_ulen); 545 /* 546 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 547 * iff payload length > 0xffff. 548 */ 549 if (ulen == 0 && plen > 0xffff) 550 ulen = plen; 551 552 if (plen != ulen) { 553 UDP6_STATINC(UDP6_STAT_BADLEN); 554 goto bad; 555 } 556 557 /* destination port of 0 is illegal, based on RFC768. */ 558 if (uh->uh_dport == 0) 559 goto bad; 560 561 /* Be proactive about malicious use of IPv4 mapped address */ 562 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 563 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 564 /* XXX stat */ 565 goto bad; 566 } 567 568 /* 569 * Checksum extended UDP header and data. Maybe skip checksum 570 * on loopback interfaces. 571 */ 572 if (udp6_input_checksum(m, uh, off, ulen)) 573 goto bad; 574 575 /* 576 * Construct source and dst sockaddrs. 577 */ 578 bzero(&src, sizeof(src)); 579 src.sin6_family = AF_INET6; 580 src.sin6_len = sizeof(struct sockaddr_in6); 581 src.sin6_addr = ip6->ip6_src; 582 src.sin6_port = uh->uh_sport; 583 bzero(&dst, sizeof(dst)); 584 dst.sin6_family = AF_INET6; 585 dst.sin6_len = sizeof(struct sockaddr_in6); 586 dst.sin6_addr = ip6->ip6_dst; 587 dst.sin6_port = uh->uh_dport; 588 589 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 590 if (m->m_flags & M_MCAST) { 591 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 592 goto bad; 593 } 594 UDP6_STATINC(UDP6_STAT_NOPORT); 595 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 596 m = NULL; 597 } 598 599 bad: 600 if (m) 601 m_freem(m); 602 return IPPROTO_DONE; 603 } 604 #endif 605 606 #ifdef INET 607 static void 608 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 609 struct sockaddr *src, struct socket *so) 610 { 611 struct mbuf *opts = NULL; 612 struct mbuf *n; 613 struct inpcb *inp = NULL; 614 615 if (!so) 616 return; 617 switch (so->so_proto->pr_domain->dom_family) { 618 case AF_INET: 619 inp = sotoinpcb(so); 620 break; 621 #ifdef INET6 622 case AF_INET6: 623 break; 624 #endif 625 default: 626 return; 627 } 628 629 #if defined(IPSEC) || defined(FAST_IPSEC) 630 /* check AH/ESP integrity. */ 631 if (so != NULL && ipsec4_in_reject_so(m, so)) { 632 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 633 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 634 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 635 0, 0); 636 return; 637 } 638 #endif /*IPSEC*/ 639 640 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 641 if (inp && (inp->inp_flags & INP_CONTROLOPTS 642 || so->so_options & SO_TIMESTAMP)) { 643 struct ip *ip = mtod(n, struct ip *); 644 ip_savecontrol(inp, &opts, ip, n); 645 } 646 647 m_adj(n, off); 648 if (sbappendaddr(&so->so_rcv, src, n, 649 opts) == 0) { 650 m_freem(n); 651 if (opts) 652 m_freem(opts); 653 so->so_rcv.sb_overflowed++; 654 UDP_STATINC(UDP_STAT_FULLSOCK); 655 } else 656 sorwakeup(so); 657 } 658 } 659 #endif 660 661 #ifdef INET6 662 static void 663 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 664 struct sockaddr *src, struct socket *so) 665 { 666 struct mbuf *opts = NULL; 667 struct mbuf *n; 668 struct in6pcb *in6p = NULL; 669 670 if (!so) 671 return; 672 if (so->so_proto->pr_domain->dom_family != AF_INET6) 673 return; 674 in6p = sotoin6pcb(so); 675 676 #if defined(IPSEC) || defined(FAST_IPSEC) 677 /* check AH/ESP integrity. */ 678 if (so != NULL && ipsec6_in_reject_so(m, so)) { 679 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 680 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 681 icmp6_error(n, ICMP6_DST_UNREACH, 682 ICMP6_DST_UNREACH_ADMIN, 0); 683 return; 684 } 685 #endif /*IPSEC*/ 686 687 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 688 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 689 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 690 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 691 ip6_savecontrol(in6p, &opts, ip6, n); 692 } 693 694 m_adj(n, off); 695 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 696 m_freem(n); 697 if (opts) 698 m_freem(opts); 699 so->so_rcv.sb_overflowed++; 700 UDP6_STATINC(UDP6_STAT_FULLSOCK); 701 } else 702 sorwakeup(so); 703 } 704 } 705 #endif 706 707 #ifdef INET 708 static int 709 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 710 struct mbuf **mp, int off /* offset of udphdr */) 711 { 712 u_int16_t *sport, *dport; 713 int rcvcnt; 714 struct in_addr *src4, *dst4; 715 struct inpcb_hdr *inph; 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(inph, &udbtable.inpt_queue, inph_queue) { 756 inp = (struct inpcb *)inph; 757 if (inp->inp_af != AF_INET) 758 continue; 759 760 if (inp->inp_lport != *dport) 761 continue; 762 if (!in_nullhost(inp->inp_laddr)) { 763 if (!in_hosteq(inp->inp_laddr, *dst4)) 764 continue; 765 } 766 if (!in_nullhost(inp->inp_faddr)) { 767 if (!in_hosteq(inp->inp_faddr, *src4) || 768 inp->inp_fport != *sport) 769 continue; 770 } 771 772 udp4_sendup(m, off, (struct sockaddr *)src, 773 inp->inp_socket); 774 rcvcnt++; 775 776 /* 777 * Don't look for additional matches if this one does 778 * not have either the SO_REUSEPORT or SO_REUSEADDR 779 * socket options set. This heuristic avoids searching 780 * through all pcbs in the common case of a non-shared 781 * port. It assumes that an application will never 782 * clear these options after setting them. 783 */ 784 if ((inp->inp_socket->so_options & 785 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 786 break; 787 } 788 } else { 789 /* 790 * Locate pcb for datagram. 791 */ 792 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 793 if (inp == 0) { 794 UDP_STATINC(UDP_STAT_PCBHASHMISS); 795 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 796 if (inp == 0) 797 return rcvcnt; 798 } 799 800 #ifdef IPSEC_NAT_T 801 /* Handle ESP over UDP */ 802 if (inp->inp_flags & INP_ESPINUDP_ALL) { 803 struct sockaddr *sa = (struct sockaddr *)src; 804 805 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 806 case -1: /* Error, m was freeed */ 807 rcvcnt = -1; 808 goto bad; 809 break; 810 811 case 1: /* ESP over UDP */ 812 rcvcnt++; 813 goto bad; 814 break; 815 816 case 0: /* plain UDP */ 817 default: /* Unexpected */ 818 /* 819 * Normal UDP processing will take place 820 * m may have changed. 821 */ 822 m = *mp; 823 break; 824 } 825 } 826 #endif 827 828 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 829 rcvcnt++; 830 } 831 832 bad: 833 return rcvcnt; 834 } 835 #endif 836 837 #ifdef INET6 838 static int 839 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 840 struct mbuf *m, int off) 841 { 842 u_int16_t sport, dport; 843 int rcvcnt; 844 struct in6_addr src6, *dst6; 845 const struct in_addr *dst4; 846 struct inpcb_hdr *inph; 847 struct in6pcb *in6p; 848 849 rcvcnt = 0; 850 off += sizeof(struct udphdr); /* now, offset of payload */ 851 852 if (af != AF_INET && af != AF_INET6) 853 goto bad; 854 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 855 goto bad; 856 857 src6 = src->sin6_addr; 858 if (sa6_recoverscope(src) != 0) { 859 /* XXX: should be impossible. */ 860 goto bad; 861 } 862 sport = src->sin6_port; 863 864 dport = dst->sin6_port; 865 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 866 dst6 = &dst->sin6_addr; 867 868 if (IN6_IS_ADDR_MULTICAST(dst6) || 869 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 870 /* 871 * Deliver a multicast or broadcast datagram to *all* sockets 872 * for which the local and remote addresses and ports match 873 * those of the incoming datagram. This allows more than 874 * one process to receive multi/broadcasts on the same port. 875 * (This really ought to be done for unicast datagrams as 876 * well, but that would cause problems with existing 877 * applications that open both address-specific sockets and 878 * a wildcard socket listening to the same port -- they would 879 * end up receiving duplicates of every unicast datagram. 880 * Those applications open the multiple sockets to overcome an 881 * inadequacy of the UDP socket interface, but for backwards 882 * compatibility we avoid the problem here rather than 883 * fixing the interface. Maybe 4.5BSD will remedy this?) 884 */ 885 886 /* 887 * KAME note: traditionally we dropped udpiphdr from mbuf here. 888 * we need udpiphdr for IPsec processing so we do that later. 889 */ 890 /* 891 * Locate pcb(s) for datagram. 892 */ 893 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 894 in6p = (struct in6pcb *)inph; 895 if (in6p->in6p_af != AF_INET6) 896 continue; 897 898 if (in6p->in6p_lport != dport) 899 continue; 900 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 901 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 902 dst6)) 903 continue; 904 } else { 905 if (IN6_IS_ADDR_V4MAPPED(dst6) && 906 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 907 continue; 908 } 909 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 910 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 911 &src6) || in6p->in6p_fport != sport) 912 continue; 913 } else { 914 if (IN6_IS_ADDR_V4MAPPED(&src6) && 915 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 916 continue; 917 } 918 919 udp6_sendup(m, off, (struct sockaddr *)src, 920 in6p->in6p_socket); 921 rcvcnt++; 922 923 /* 924 * Don't look for additional matches if this one does 925 * not have either the SO_REUSEPORT or SO_REUSEADDR 926 * socket options set. This heuristic avoids searching 927 * through all pcbs in the common case of a non-shared 928 * port. It assumes that an application will never 929 * clear these options after setting them. 930 */ 931 if ((in6p->in6p_socket->so_options & 932 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 933 break; 934 } 935 } else { 936 /* 937 * Locate pcb for datagram. 938 */ 939 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 940 dport, 0); 941 if (in6p == 0) { 942 UDP_STATINC(UDP_STAT_PCBHASHMISS); 943 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 944 if (in6p == 0) 945 return rcvcnt; 946 } 947 948 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 949 rcvcnt++; 950 } 951 952 bad: 953 return rcvcnt; 954 } 955 #endif 956 957 #ifdef INET 958 /* 959 * Notify a udp user of an asynchronous error; 960 * just wake up so that he can collect error status. 961 */ 962 static void 963 udp_notify(struct inpcb *inp, int errno) 964 { 965 inp->inp_socket->so_error = errno; 966 sorwakeup(inp->inp_socket); 967 sowwakeup(inp->inp_socket); 968 } 969 970 void * 971 udp_ctlinput(int cmd, const struct sockaddr *sa, void *v) 972 { 973 struct ip *ip = v; 974 struct udphdr *uh; 975 void (*notify)(struct inpcb *, int) = udp_notify; 976 int errno; 977 978 if (sa->sa_family != AF_INET 979 || sa->sa_len != sizeof(struct sockaddr_in)) 980 return NULL; 981 if ((unsigned)cmd >= PRC_NCMDS) 982 return NULL; 983 errno = inetctlerrmap[cmd]; 984 if (PRC_IS_REDIRECT(cmd)) 985 notify = in_rtchange, ip = 0; 986 else if (cmd == PRC_HOSTDEAD) 987 ip = 0; 988 else if (errno == 0) 989 return NULL; 990 if (ip) { 991 uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2)); 992 in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport, 993 ip->ip_src, uh->uh_sport, errno, notify); 994 995 /* XXX mapped address case */ 996 } else 997 in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno, 998 notify); 999 return NULL; 1000 } 1001 1002 int 1003 udp_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1004 { 1005 int s; 1006 int error = 0; 1007 struct inpcb *inp; 1008 int family; 1009 int optval; 1010 1011 family = so->so_proto->pr_domain->dom_family; 1012 1013 s = splsoftnet(); 1014 switch (family) { 1015 #ifdef INET 1016 case PF_INET: 1017 if (sopt->sopt_level != IPPROTO_UDP) { 1018 error = ip_ctloutput(op, so, sopt); 1019 goto end; 1020 } 1021 break; 1022 #endif 1023 #ifdef INET6 1024 case PF_INET6: 1025 if (sopt->sopt_level != IPPROTO_UDP) { 1026 error = ip6_ctloutput(op, so, sopt); 1027 goto end; 1028 } 1029 break; 1030 #endif 1031 default: 1032 error = EAFNOSUPPORT; 1033 goto end; 1034 } 1035 1036 1037 switch (op) { 1038 case PRCO_SETOPT: 1039 inp = sotoinpcb(so); 1040 1041 switch (sopt->sopt_name) { 1042 case UDP_ENCAP: 1043 error = sockopt_getint(sopt, &optval); 1044 if (error) 1045 break; 1046 1047 switch(optval) { 1048 #ifdef IPSEC_NAT_T 1049 case 0: 1050 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1051 break; 1052 1053 case UDP_ENCAP_ESPINUDP: 1054 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1055 inp->inp_flags |= INP_ESPINUDP; 1056 break; 1057 1058 case UDP_ENCAP_ESPINUDP_NON_IKE: 1059 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1060 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1061 break; 1062 #endif 1063 default: 1064 error = EINVAL; 1065 break; 1066 } 1067 break; 1068 1069 default: 1070 error = ENOPROTOOPT; 1071 break; 1072 } 1073 break; 1074 1075 default: 1076 error = EINVAL; 1077 break; 1078 } 1079 1080 end: 1081 splx(s); 1082 return error; 1083 } 1084 1085 1086 int 1087 udp_output(struct mbuf *m, ...) 1088 { 1089 struct inpcb *inp; 1090 struct udpiphdr *ui; 1091 struct route *ro; 1092 int len = m->m_pkthdr.len; 1093 int error = 0; 1094 va_list ap; 1095 1096 MCLAIM(m, &udp_tx_mowner); 1097 va_start(ap, m); 1098 inp = va_arg(ap, struct inpcb *); 1099 va_end(ap); 1100 1101 /* 1102 * Calculate data length and get a mbuf 1103 * for UDP and IP headers. 1104 */ 1105 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1106 if (m == 0) { 1107 error = ENOBUFS; 1108 goto release; 1109 } 1110 1111 /* 1112 * Compute the packet length of the IP header, and 1113 * punt if the length looks bogus. 1114 */ 1115 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1116 error = EMSGSIZE; 1117 goto release; 1118 } 1119 1120 /* 1121 * Fill in mbuf with extended UDP header 1122 * and addresses and length put into network format. 1123 */ 1124 ui = mtod(m, struct udpiphdr *); 1125 ui->ui_pr = IPPROTO_UDP; 1126 ui->ui_src = inp->inp_laddr; 1127 ui->ui_dst = inp->inp_faddr; 1128 ui->ui_sport = inp->inp_lport; 1129 ui->ui_dport = inp->inp_fport; 1130 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1131 1132 ro = &inp->inp_route; 1133 1134 /* 1135 * Set up checksum and output datagram. 1136 */ 1137 if (udpcksum) { 1138 /* 1139 * XXX Cache pseudo-header checksum part for 1140 * XXX "connected" UDP sockets. 1141 */ 1142 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1143 ui->ui_dst.s_addr, htons((u_int16_t)len + 1144 sizeof(struct udphdr) + IPPROTO_UDP)); 1145 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1146 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1147 } else 1148 ui->ui_sum = 0; 1149 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1150 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1151 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1152 UDP_STATINC(UDP_STAT_OPACKETS); 1153 1154 return (ip_output(m, inp->inp_options, ro, 1155 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1156 inp->inp_moptions, inp->inp_socket)); 1157 1158 release: 1159 m_freem(m); 1160 return (error); 1161 } 1162 1163 int udp_sendspace = 9216; /* really max datagram size */ 1164 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1165 /* 40 1K datagrams */ 1166 1167 /*ARGSUSED*/ 1168 int 1169 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1170 struct mbuf *control, struct lwp *l) 1171 { 1172 struct inpcb *inp; 1173 int s; 1174 int error = 0; 1175 1176 if (req == PRU_CONTROL) 1177 return (in_control(so, (long)m, (void *)nam, 1178 (struct ifnet *)control, l)); 1179 1180 s = splsoftnet(); 1181 1182 if (req == PRU_PURGEIF) { 1183 mutex_enter(softnet_lock); 1184 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1185 in_purgeif((struct ifnet *)control); 1186 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1187 mutex_exit(softnet_lock); 1188 splx(s); 1189 return (0); 1190 } 1191 1192 inp = sotoinpcb(so); 1193 #ifdef DIAGNOSTIC 1194 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1195 panic("udp_usrreq: unexpected control mbuf"); 1196 #endif 1197 if (req == PRU_ATTACH) { 1198 sosetlock(so); 1199 } else if (inp == 0) { 1200 error = EINVAL; 1201 goto release; 1202 } 1203 1204 /* 1205 * Note: need to block udp_input while changing 1206 * the udp pcb queue and/or pcb addresses. 1207 */ 1208 switch (req) { 1209 1210 case PRU_ATTACH: 1211 if (inp != 0) { 1212 error = EISCONN; 1213 break; 1214 } 1215 #ifdef MBUFTRACE 1216 so->so_mowner = &udp_mowner; 1217 so->so_rcv.sb_mowner = &udp_rx_mowner; 1218 so->so_snd.sb_mowner = &udp_tx_mowner; 1219 #endif 1220 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1221 error = soreserve(so, udp_sendspace, udp_recvspace); 1222 if (error) 1223 break; 1224 } 1225 error = in_pcballoc(so, &udbtable); 1226 if (error) 1227 break; 1228 inp = sotoinpcb(so); 1229 inp->inp_ip.ip_ttl = ip_defttl; 1230 break; 1231 1232 case PRU_DETACH: 1233 in_pcbdetach(inp); 1234 break; 1235 1236 case PRU_BIND: 1237 error = in_pcbbind(inp, nam, l); 1238 break; 1239 1240 case PRU_LISTEN: 1241 error = EOPNOTSUPP; 1242 break; 1243 1244 case PRU_CONNECT: 1245 error = in_pcbconnect(inp, nam, l); 1246 if (error) 1247 break; 1248 soisconnected(so); 1249 break; 1250 1251 case PRU_CONNECT2: 1252 error = EOPNOTSUPP; 1253 break; 1254 1255 case PRU_DISCONNECT: 1256 /*soisdisconnected(so);*/ 1257 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1258 in_pcbdisconnect(inp); 1259 inp->inp_laddr = zeroin_addr; /* XXX */ 1260 in_pcbstate(inp, INP_BOUND); /* XXX */ 1261 break; 1262 1263 case PRU_SHUTDOWN: 1264 socantsendmore(so); 1265 break; 1266 1267 case PRU_RCVD: 1268 error = EOPNOTSUPP; 1269 break; 1270 1271 case PRU_SEND: 1272 if (control && control->m_len) { 1273 m_freem(control); 1274 m_freem(m); 1275 error = EINVAL; 1276 break; 1277 } 1278 { 1279 struct in_addr laddr; /* XXX */ 1280 1281 if (nam) { 1282 laddr = inp->inp_laddr; /* XXX */ 1283 if ((so->so_state & SS_ISCONNECTED) != 0) { 1284 error = EISCONN; 1285 goto die; 1286 } 1287 error = in_pcbconnect(inp, nam, l); 1288 if (error) 1289 goto die; 1290 } else { 1291 if ((so->so_state & SS_ISCONNECTED) == 0) { 1292 error = ENOTCONN; 1293 goto die; 1294 } 1295 } 1296 error = udp_output(m, inp); 1297 m = NULL; 1298 if (nam) { 1299 in_pcbdisconnect(inp); 1300 inp->inp_laddr = laddr; /* XXX */ 1301 in_pcbstate(inp, INP_BOUND); /* XXX */ 1302 } 1303 die: 1304 if (m) 1305 m_freem(m); 1306 } 1307 break; 1308 1309 case PRU_SENSE: 1310 /* 1311 * stat: don't bother with a blocksize. 1312 */ 1313 splx(s); 1314 return (0); 1315 1316 case PRU_RCVOOB: 1317 error = EOPNOTSUPP; 1318 break; 1319 1320 case PRU_SENDOOB: 1321 m_freem(control); 1322 m_freem(m); 1323 error = EOPNOTSUPP; 1324 break; 1325 1326 case PRU_SOCKADDR: 1327 in_setsockaddr(inp, nam); 1328 break; 1329 1330 case PRU_PEERADDR: 1331 in_setpeeraddr(inp, nam); 1332 break; 1333 1334 default: 1335 panic("udp_usrreq"); 1336 } 1337 1338 release: 1339 splx(s); 1340 return (error); 1341 } 1342 1343 static int 1344 sysctl_net_inet_udp_stats(SYSCTLFN_ARGS) 1345 { 1346 1347 return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS)); 1348 } 1349 1350 /* 1351 * Sysctl for udp variables. 1352 */ 1353 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1354 { 1355 1356 sysctl_createv(clog, 0, NULL, NULL, 1357 CTLFLAG_PERMANENT, 1358 CTLTYPE_NODE, "net", NULL, 1359 NULL, 0, NULL, 0, 1360 CTL_NET, CTL_EOL); 1361 sysctl_createv(clog, 0, NULL, NULL, 1362 CTLFLAG_PERMANENT, 1363 CTLTYPE_NODE, "inet", NULL, 1364 NULL, 0, NULL, 0, 1365 CTL_NET, PF_INET, CTL_EOL); 1366 sysctl_createv(clog, 0, NULL, NULL, 1367 CTLFLAG_PERMANENT, 1368 CTLTYPE_NODE, "udp", 1369 SYSCTL_DESCR("UDPv4 related settings"), 1370 NULL, 0, NULL, 0, 1371 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1372 1373 sysctl_createv(clog, 0, NULL, NULL, 1374 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1375 CTLTYPE_INT, "checksum", 1376 SYSCTL_DESCR("Compute UDP checksums"), 1377 NULL, 0, &udpcksum, 0, 1378 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1379 CTL_EOL); 1380 sysctl_createv(clog, 0, NULL, NULL, 1381 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1382 CTLTYPE_INT, "sendspace", 1383 SYSCTL_DESCR("Default UDP send buffer size"), 1384 NULL, 0, &udp_sendspace, 0, 1385 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1386 CTL_EOL); 1387 sysctl_createv(clog, 0, NULL, NULL, 1388 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1389 CTLTYPE_INT, "recvspace", 1390 SYSCTL_DESCR("Default UDP receive buffer size"), 1391 NULL, 0, &udp_recvspace, 0, 1392 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1393 CTL_EOL); 1394 sysctl_createv(clog, 0, NULL, NULL, 1395 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1396 CTLTYPE_INT, "do_loopback_cksum", 1397 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1398 NULL, 0, &udp_do_loopback_cksum, 0, 1399 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1400 CTL_EOL); 1401 sysctl_createv(clog, 0, NULL, NULL, 1402 CTLFLAG_PERMANENT, 1403 CTLTYPE_STRUCT, "pcblist", 1404 SYSCTL_DESCR("UDP protocol control block list"), 1405 sysctl_inpcblist, 0, &udbtable, 0, 1406 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1407 CTL_EOL); 1408 sysctl_createv(clog, 0, NULL, NULL, 1409 CTLFLAG_PERMANENT, 1410 CTLTYPE_STRUCT, "stats", 1411 SYSCTL_DESCR("UDP statistics"), 1412 sysctl_net_inet_udp_stats, 0, NULL, 0, 1413 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1414 CTL_EOL); 1415 } 1416 #endif 1417 1418 void 1419 udp_statinc(u_int stat) 1420 { 1421 1422 KASSERT(stat < UDP_NSTATS); 1423 UDP_STATINC(stat); 1424 } 1425 1426 #if (defined INET && defined IPSEC_NAT_T) 1427 /* 1428 * Returns: 1429 * 1 if the packet was processed 1430 * 0 if normal UDP processing should take place 1431 * -1 if an error occurent and m was freed 1432 */ 1433 static int 1434 udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src, 1435 struct socket *so) 1436 { 1437 size_t len; 1438 void *data; 1439 struct inpcb *inp; 1440 size_t skip = 0; 1441 size_t minlen; 1442 size_t iphdrlen; 1443 struct ip *ip; 1444 struct mbuf *n; 1445 struct m_tag *tag; 1446 struct udphdr *udphdr; 1447 u_int16_t sport, dport; 1448 struct mbuf *m = *mp; 1449 1450 /* 1451 * Collapse the mbuf chain if the first mbuf is too short 1452 * The longest case is: UDP + non ESP marker + ESP 1453 */ 1454 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1455 if (minlen > m->m_pkthdr.len) 1456 minlen = m->m_pkthdr.len; 1457 1458 if (m->m_len < minlen) { 1459 if ((*mp = m_pullup(m, minlen)) == NULL) { 1460 printf("udp4_espinudp: m_pullup failed\n"); 1461 return -1; 1462 } 1463 m = *mp; 1464 } 1465 1466 len = m->m_len - off; 1467 data = mtod(m, char *) + off; 1468 inp = sotoinpcb(so); 1469 1470 /* Ignore keepalive packets */ 1471 if ((len == 1) && (*(unsigned char *)data == 0xff)) { 1472 return 1; 1473 } 1474 1475 /* 1476 * Check that the payload is long enough to hold 1477 * an ESP header and compute the length of encapsulation 1478 * header to remove 1479 */ 1480 if (inp->inp_flags & INP_ESPINUDP) { 1481 u_int32_t *st = (u_int32_t *)data; 1482 1483 if ((len <= sizeof(struct esp)) || (*st == 0)) 1484 return 0; /* Normal UDP processing */ 1485 1486 skip = sizeof(struct udphdr); 1487 } 1488 1489 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1490 u_int32_t *st = (u_int32_t *)data; 1491 1492 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1493 || ((st[0] | st[1]) != 0)) 1494 return 0; /* Normal UDP processing */ 1495 1496 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1497 } 1498 1499 /* 1500 * Get the UDP ports. They are handled in network 1501 * order everywhere in IPSEC_NAT_T code. 1502 */ 1503 udphdr = (struct udphdr *)((char *)data - skip); 1504 sport = udphdr->uh_sport; 1505 dport = udphdr->uh_dport; 1506 1507 /* 1508 * Remove the UDP header (and possibly the non ESP marker) 1509 * IP header lendth is iphdrlen 1510 * Before: 1511 * <--- off ---> 1512 * +----+------+-----+ 1513 * | IP | UDP | ESP | 1514 * +----+------+-----+ 1515 * <-skip-> 1516 * After: 1517 * +----+-----+ 1518 * | IP | ESP | 1519 * +----+-----+ 1520 * <-skip-> 1521 */ 1522 iphdrlen = off - sizeof(struct udphdr); 1523 memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen); 1524 m_adj(m, skip); 1525 1526 ip = mtod(m, struct ip *); 1527 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1528 ip->ip_p = IPPROTO_ESP; 1529 1530 /* 1531 * Copy the mbuf to avoid multiple free, as both 1532 * esp4_input (which we call) and udp_input (which 1533 * called us) free the mbuf. 1534 */ 1535 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1536 printf("udp4_espinudp: m_dup failed\n"); 1537 return 0; 1538 } 1539 1540 /* 1541 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1542 * the source UDP port. This is required if we want 1543 * to select the right SPD for multiple hosts behind 1544 * same NAT 1545 */ 1546 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1547 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1548 printf("udp4_espinudp: m_tag_get failed\n"); 1549 m_freem(n); 1550 return 0; 1551 } 1552 ((u_int16_t *)(tag + 1))[0] = sport; 1553 ((u_int16_t *)(tag + 1))[1] = dport; 1554 m_tag_prepend(n, tag); 1555 1556 #ifdef FAST_IPSEC 1557 ipsec4_common_input(n, iphdrlen, IPPROTO_ESP); 1558 #else 1559 esp4_input(n, iphdrlen); 1560 #endif 1561 1562 /* We handled it, it shoudln't be handled by UDP */ 1563 return 1; 1564 } 1565 #endif 1566