1 /* $NetBSD: udp_usrreq.c,v 1.187 2012/06/22 14:54:35 christos 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 1.187 2012/06/22 14:54:35 christos Exp $"); 65 66 #include "opt_inet.h" 67 #include "opt_compat_netbsd.h" 68 #include "opt_ipsec.h" 69 #include "opt_inet_csum.h" 70 #include "opt_ipkdb.h" 71 #include "opt_mbuftrace.h" 72 73 #include <sys/param.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/errno.h> 80 #include <sys/stat.h> 81 #include <sys/systm.h> 82 #include <sys/proc.h> 83 #include <sys/domain.h> 84 #include <sys/sysctl.h> 85 86 #include <net/if.h> 87 #include <net/route.h> 88 89 #include <netinet/in.h> 90 #include <netinet/in_systm.h> 91 #include <netinet/in_var.h> 92 #include <netinet/ip.h> 93 #include <netinet/in_pcb.h> 94 #include <netinet/ip_var.h> 95 #include <netinet/ip_icmp.h> 96 #include <netinet/udp.h> 97 #include <netinet/udp_var.h> 98 #include <netinet/udp_private.h> 99 100 #ifdef INET6 101 #include <netinet/ip6.h> 102 #include <netinet/icmp6.h> 103 #include <netinet6/ip6_var.h> 104 #include <netinet6/ip6_private.h> 105 #include <netinet6/in6_pcb.h> 106 #include <netinet6/udp6_var.h> 107 #include <netinet6/udp6_private.h> 108 #include <netinet6/scope6_var.h> 109 #endif 110 111 #ifndef INET6 112 /* always need ip6.h for IP6_EXTHDR_GET */ 113 #include <netinet/ip6.h> 114 #endif 115 116 #include "faith.h" 117 #if defined(NFAITH) && NFAITH > 0 118 #include <net/if_faith.h> 119 #endif 120 121 #ifdef FAST_IPSEC 122 #include <netipsec/ipsec.h> 123 #include <netipsec/ipsec_var.h> 124 #include <netipsec/ipsec_private.h> 125 #include <netipsec/esp.h> 126 #ifdef INET6 127 #include <netipsec/ipsec6.h> 128 #endif 129 #endif /* FAST_IPSEC */ 130 131 #ifdef COMPAT_50 132 #include <compat/sys/socket.h> 133 #endif 134 135 #ifdef IPKDB 136 #include <ipkdb/ipkdb.h> 137 #endif 138 139 /* 140 * UDP protocol implementation. 141 * Per RFC 768, August, 1980. 142 */ 143 int udpcksum = 1; 144 int udp_do_loopback_cksum = 0; 145 146 struct inpcbtable udbtable; 147 148 percpu_t *udpstat_percpu; 149 150 #ifdef INET 151 #ifdef IPSEC_NAT_T 152 static int udp4_espinudp (struct mbuf **, int, struct sockaddr *, 153 struct socket *); 154 #endif 155 static void udp4_sendup (struct mbuf *, int, struct sockaddr *, 156 struct socket *); 157 static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, 158 struct mbuf **, int); 159 static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); 160 #endif 161 #ifdef INET6 162 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 163 struct socket *); 164 static int udp6_realinput (int, struct sockaddr_in6 *, 165 struct sockaddr_in6 *, struct mbuf *, int); 166 static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int); 167 #endif 168 #ifdef INET 169 static void udp_notify (struct inpcb *, int); 170 #endif 171 172 #ifndef UDBHASHSIZE 173 #define UDBHASHSIZE 128 174 #endif 175 int udbhashsize = UDBHASHSIZE; 176 177 #ifdef MBUFTRACE 178 struct mowner udp_mowner = MOWNER_INIT("udp", ""); 179 struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx"); 180 struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx"); 181 #endif 182 183 #ifdef UDP_CSUM_COUNTERS 184 #include <sys/device.h> 185 186 #if defined(INET) 187 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 188 NULL, "udp", "hwcsum bad"); 189 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 190 NULL, "udp", "hwcsum ok"); 191 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 192 NULL, "udp", "hwcsum data"); 193 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 194 NULL, "udp", "swcsum"); 195 196 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 197 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 198 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 199 EVCNT_ATTACH_STATIC(udp_swcsum); 200 #endif /* defined(INET) */ 201 202 #if defined(INET6) 203 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 204 NULL, "udp6", "hwcsum bad"); 205 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 206 NULL, "udp6", "hwcsum ok"); 207 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 208 NULL, "udp6", "hwcsum data"); 209 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 210 NULL, "udp6", "swcsum"); 211 212 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 213 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 214 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 215 EVCNT_ATTACH_STATIC(udp6_swcsum); 216 #endif /* defined(INET6) */ 217 218 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 219 220 #else 221 222 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 223 224 #endif /* UDP_CSUM_COUNTERS */ 225 226 static void sysctl_net_inet_udp_setup(struct sysctllog **); 227 228 void 229 udp_init(void) 230 { 231 232 sysctl_net_inet_udp_setup(NULL); 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 memset(&src6, 0, 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 memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src, 416 sizeof(ip->ip_src)); 417 src6.sin6_port = uh->uh_sport; 418 memset(&dst6, 0, 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 memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst, 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 memset(&src, 0, 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 memset(&dst, 0, 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(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 #ifdef SO_OTIMESTAMP 643 || so->so_options & SO_OTIMESTAMP 644 #endif 645 || so->so_options & SO_TIMESTAMP)) { 646 struct ip *ip = mtod(n, struct ip *); 647 ip_savecontrol(inp, &opts, ip, n); 648 } 649 650 m_adj(n, off); 651 if (sbappendaddr(&so->so_rcv, src, n, 652 opts) == 0) { 653 m_freem(n); 654 if (opts) 655 m_freem(opts); 656 so->so_rcv.sb_overflowed++; 657 UDP_STATINC(UDP_STAT_FULLSOCK); 658 } else 659 sorwakeup(so); 660 } 661 } 662 #endif 663 664 #ifdef INET6 665 static void 666 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 667 struct sockaddr *src, struct socket *so) 668 { 669 struct mbuf *opts = NULL; 670 struct mbuf *n; 671 struct in6pcb *in6p = NULL; 672 673 if (!so) 674 return; 675 if (so->so_proto->pr_domain->dom_family != AF_INET6) 676 return; 677 in6p = sotoin6pcb(so); 678 679 #if defined(FAST_IPSEC) 680 /* check AH/ESP integrity. */ 681 if (so != NULL && ipsec6_in_reject_so(m, so)) { 682 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 683 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 684 icmp6_error(n, ICMP6_DST_UNREACH, 685 ICMP6_DST_UNREACH_ADMIN, 0); 686 return; 687 } 688 #endif /*IPSEC*/ 689 690 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 691 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 692 #ifdef SO_OTIMESTAMP 693 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 694 #endif 695 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 696 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 697 ip6_savecontrol(in6p, &opts, ip6, n); 698 } 699 700 m_adj(n, off); 701 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 702 m_freem(n); 703 if (opts) 704 m_freem(opts); 705 so->so_rcv.sb_overflowed++; 706 UDP6_STATINC(UDP6_STAT_FULLSOCK); 707 } else 708 sorwakeup(so); 709 } 710 } 711 #endif 712 713 #ifdef INET 714 static int 715 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 716 struct mbuf **mp, int off /* offset of udphdr */) 717 { 718 u_int16_t *sport, *dport; 719 int rcvcnt; 720 struct in_addr *src4, *dst4; 721 struct inpcb_hdr *inph; 722 struct inpcb *inp; 723 struct mbuf *m = *mp; 724 725 rcvcnt = 0; 726 off += sizeof(struct udphdr); /* now, offset of payload */ 727 728 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 729 goto bad; 730 731 src4 = &src->sin_addr; 732 sport = &src->sin_port; 733 dst4 = &dst->sin_addr; 734 dport = &dst->sin_port; 735 736 if (IN_MULTICAST(dst4->s_addr) || 737 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 738 /* 739 * Deliver a multicast or broadcast datagram to *all* sockets 740 * for which the local and remote addresses and ports match 741 * those of the incoming datagram. This allows more than 742 * one process to receive multi/broadcasts on the same port. 743 * (This really ought to be done for unicast datagrams as 744 * well, but that would cause problems with existing 745 * applications that open both address-specific sockets and 746 * a wildcard socket listening to the same port -- they would 747 * end up receiving duplicates of every unicast datagram. 748 * Those applications open the multiple sockets to overcome an 749 * inadequacy of the UDP socket interface, but for backwards 750 * compatibility we avoid the problem here rather than 751 * fixing the interface. Maybe 4.5BSD will remedy this?) 752 */ 753 754 /* 755 * KAME note: traditionally we dropped udpiphdr from mbuf here. 756 * we need udpiphdr for IPsec processing so we do that later. 757 */ 758 /* 759 * Locate pcb(s) for datagram. 760 */ 761 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 762 inp = (struct inpcb *)inph; 763 if (inp->inp_af != AF_INET) 764 continue; 765 766 if (inp->inp_lport != *dport) 767 continue; 768 if (!in_nullhost(inp->inp_laddr)) { 769 if (!in_hosteq(inp->inp_laddr, *dst4)) 770 continue; 771 } 772 if (!in_nullhost(inp->inp_faddr)) { 773 if (!in_hosteq(inp->inp_faddr, *src4) || 774 inp->inp_fport != *sport) 775 continue; 776 } 777 778 udp4_sendup(m, off, (struct sockaddr *)src, 779 inp->inp_socket); 780 rcvcnt++; 781 782 /* 783 * Don't look for additional matches if this one does 784 * not have either the SO_REUSEPORT or SO_REUSEADDR 785 * socket options set. This heuristic avoids searching 786 * through all pcbs in the common case of a non-shared 787 * port. It assumes that an application will never 788 * clear these options after setting them. 789 */ 790 if ((inp->inp_socket->so_options & 791 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 792 break; 793 } 794 } else { 795 /* 796 * Locate pcb for datagram. 797 */ 798 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, 799 *dport, 0); 800 if (inp == 0) { 801 UDP_STATINC(UDP_STAT_PCBHASHMISS); 802 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 803 if (inp == 0) 804 return rcvcnt; 805 } 806 807 #ifdef IPSEC_NAT_T 808 /* Handle ESP over UDP */ 809 if (inp->inp_flags & INP_ESPINUDP_ALL) { 810 struct sockaddr *sa = (struct sockaddr *)src; 811 812 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 813 case -1: /* Error, m was freeed */ 814 rcvcnt = -1; 815 goto bad; 816 break; 817 818 case 1: /* ESP over UDP */ 819 rcvcnt++; 820 goto bad; 821 break; 822 823 case 0: /* plain UDP */ 824 default: /* Unexpected */ 825 /* 826 * Normal UDP processing will take place 827 * m may have changed. 828 */ 829 m = *mp; 830 break; 831 } 832 } 833 #endif 834 835 /* 836 * Check the minimum TTL for socket. 837 */ 838 if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl) 839 goto bad; 840 841 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 842 rcvcnt++; 843 } 844 845 bad: 846 return rcvcnt; 847 } 848 #endif 849 850 #ifdef INET6 851 static int 852 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 853 struct mbuf *m, int off) 854 { 855 u_int16_t sport, dport; 856 int rcvcnt; 857 struct in6_addr src6, *dst6; 858 const struct in_addr *dst4; 859 struct inpcb_hdr *inph; 860 struct in6pcb *in6p; 861 862 rcvcnt = 0; 863 off += sizeof(struct udphdr); /* now, offset of payload */ 864 865 if (af != AF_INET && af != AF_INET6) 866 goto bad; 867 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 868 goto bad; 869 870 src6 = src->sin6_addr; 871 if (sa6_recoverscope(src) != 0) { 872 /* XXX: should be impossible. */ 873 goto bad; 874 } 875 sport = src->sin6_port; 876 877 dport = dst->sin6_port; 878 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 879 dst6 = &dst->sin6_addr; 880 881 if (IN6_IS_ADDR_MULTICAST(dst6) || 882 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 883 /* 884 * Deliver a multicast or broadcast datagram to *all* sockets 885 * for which the local and remote addresses and ports match 886 * those of the incoming datagram. This allows more than 887 * one process to receive multi/broadcasts on the same port. 888 * (This really ought to be done for unicast datagrams as 889 * well, but that would cause problems with existing 890 * applications that open both address-specific sockets and 891 * a wildcard socket listening to the same port -- they would 892 * end up receiving duplicates of every unicast datagram. 893 * Those applications open the multiple sockets to overcome an 894 * inadequacy of the UDP socket interface, but for backwards 895 * compatibility we avoid the problem here rather than 896 * fixing the interface. Maybe 4.5BSD will remedy this?) 897 */ 898 899 /* 900 * KAME note: traditionally we dropped udpiphdr from mbuf here. 901 * we need udpiphdr for IPsec processing so we do that later. 902 */ 903 /* 904 * Locate pcb(s) for datagram. 905 */ 906 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 907 in6p = (struct in6pcb *)inph; 908 if (in6p->in6p_af != AF_INET6) 909 continue; 910 911 if (in6p->in6p_lport != dport) 912 continue; 913 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 914 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 915 dst6)) 916 continue; 917 } else { 918 if (IN6_IS_ADDR_V4MAPPED(dst6) && 919 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 920 continue; 921 } 922 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 923 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 924 &src6) || in6p->in6p_fport != sport) 925 continue; 926 } else { 927 if (IN6_IS_ADDR_V4MAPPED(&src6) && 928 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 929 continue; 930 } 931 932 udp6_sendup(m, off, (struct sockaddr *)src, 933 in6p->in6p_socket); 934 rcvcnt++; 935 936 /* 937 * Don't look for additional matches if this one does 938 * not have either the SO_REUSEPORT or SO_REUSEADDR 939 * socket options set. This heuristic avoids searching 940 * through all pcbs in the common case of a non-shared 941 * port. It assumes that an application will never 942 * clear these options after setting them. 943 */ 944 if ((in6p->in6p_socket->so_options & 945 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 946 break; 947 } 948 } else { 949 /* 950 * Locate pcb for datagram. 951 */ 952 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 953 dport, 0, 0); 954 if (in6p == 0) { 955 UDP_STATINC(UDP_STAT_PCBHASHMISS); 956 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 957 if (in6p == 0) 958 return rcvcnt; 959 } 960 961 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 962 rcvcnt++; 963 } 964 965 bad: 966 return rcvcnt; 967 } 968 #endif 969 970 #ifdef INET 971 /* 972 * Notify a udp user of an asynchronous error; 973 * just wake up so that he can collect error status. 974 */ 975 static void 976 udp_notify(struct inpcb *inp, int errno) 977 { 978 inp->inp_socket->so_error = errno; 979 sorwakeup(inp->inp_socket); 980 sowwakeup(inp->inp_socket); 981 } 982 983 void * 984 udp_ctlinput(int cmd, const struct sockaddr *sa, void *v) 985 { 986 struct ip *ip = v; 987 struct udphdr *uh; 988 void (*notify)(struct inpcb *, int) = udp_notify; 989 int errno; 990 991 if (sa->sa_family != AF_INET 992 || sa->sa_len != sizeof(struct sockaddr_in)) 993 return NULL; 994 if ((unsigned)cmd >= PRC_NCMDS) 995 return NULL; 996 errno = inetctlerrmap[cmd]; 997 if (PRC_IS_REDIRECT(cmd)) 998 notify = in_rtchange, ip = 0; 999 else if (cmd == PRC_HOSTDEAD) 1000 ip = 0; 1001 else if (errno == 0) 1002 return NULL; 1003 if (ip) { 1004 uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2)); 1005 in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport, 1006 ip->ip_src, uh->uh_sport, errno, notify); 1007 1008 /* XXX mapped address case */ 1009 } else 1010 in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno, 1011 notify); 1012 return NULL; 1013 } 1014 1015 int 1016 udp_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1017 { 1018 int s; 1019 int error = 0; 1020 struct inpcb *inp; 1021 int family; 1022 int optval; 1023 1024 family = so->so_proto->pr_domain->dom_family; 1025 1026 s = splsoftnet(); 1027 switch (family) { 1028 #ifdef INET 1029 case PF_INET: 1030 if (sopt->sopt_level != IPPROTO_UDP) { 1031 error = ip_ctloutput(op, so, sopt); 1032 goto end; 1033 } 1034 break; 1035 #endif 1036 #ifdef INET6 1037 case PF_INET6: 1038 if (sopt->sopt_level != IPPROTO_UDP) { 1039 error = ip6_ctloutput(op, so, sopt); 1040 goto end; 1041 } 1042 break; 1043 #endif 1044 default: 1045 error = EAFNOSUPPORT; 1046 goto end; 1047 } 1048 1049 1050 switch (op) { 1051 case PRCO_SETOPT: 1052 inp = sotoinpcb(so); 1053 1054 switch (sopt->sopt_name) { 1055 case UDP_ENCAP: 1056 error = sockopt_getint(sopt, &optval); 1057 if (error) 1058 break; 1059 1060 switch(optval) { 1061 #ifdef IPSEC_NAT_T 1062 case 0: 1063 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1064 break; 1065 1066 case UDP_ENCAP_ESPINUDP: 1067 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1068 inp->inp_flags |= INP_ESPINUDP; 1069 break; 1070 1071 case UDP_ENCAP_ESPINUDP_NON_IKE: 1072 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1073 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1074 break; 1075 #endif 1076 default: 1077 error = EINVAL; 1078 break; 1079 } 1080 break; 1081 1082 default: 1083 error = ENOPROTOOPT; 1084 break; 1085 } 1086 break; 1087 1088 default: 1089 error = EINVAL; 1090 break; 1091 } 1092 1093 end: 1094 splx(s); 1095 return error; 1096 } 1097 1098 1099 int 1100 udp_output(struct mbuf *m, ...) 1101 { 1102 struct inpcb *inp; 1103 struct udpiphdr *ui; 1104 struct route *ro; 1105 int len = m->m_pkthdr.len; 1106 int error = 0; 1107 va_list ap; 1108 1109 MCLAIM(m, &udp_tx_mowner); 1110 va_start(ap, m); 1111 inp = va_arg(ap, struct inpcb *); 1112 va_end(ap); 1113 1114 /* 1115 * Calculate data length and get a mbuf 1116 * for UDP and IP headers. 1117 */ 1118 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1119 if (m == 0) { 1120 error = ENOBUFS; 1121 goto release; 1122 } 1123 1124 /* 1125 * Compute the packet length of the IP header, and 1126 * punt if the length looks bogus. 1127 */ 1128 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1129 error = EMSGSIZE; 1130 goto release; 1131 } 1132 1133 /* 1134 * Fill in mbuf with extended UDP header 1135 * and addresses and length put into network format. 1136 */ 1137 ui = mtod(m, struct udpiphdr *); 1138 ui->ui_pr = IPPROTO_UDP; 1139 ui->ui_src = inp->inp_laddr; 1140 ui->ui_dst = inp->inp_faddr; 1141 ui->ui_sport = inp->inp_lport; 1142 ui->ui_dport = inp->inp_fport; 1143 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1144 1145 ro = &inp->inp_route; 1146 1147 /* 1148 * Set up checksum and output datagram. 1149 */ 1150 if (udpcksum) { 1151 /* 1152 * XXX Cache pseudo-header checksum part for 1153 * XXX "connected" UDP sockets. 1154 */ 1155 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1156 ui->ui_dst.s_addr, htons((u_int16_t)len + 1157 sizeof(struct udphdr) + IPPROTO_UDP)); 1158 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1159 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1160 } else 1161 ui->ui_sum = 0; 1162 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1163 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1164 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1165 UDP_STATINC(UDP_STAT_OPACKETS); 1166 1167 return (ip_output(m, inp->inp_options, ro, 1168 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1169 inp->inp_moptions, inp->inp_socket)); 1170 1171 release: 1172 m_freem(m); 1173 return (error); 1174 } 1175 1176 int udp_sendspace = 9216; /* really max datagram size */ 1177 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1178 /* 40 1K datagrams */ 1179 1180 /*ARGSUSED*/ 1181 int 1182 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1183 struct mbuf *control, struct lwp *l) 1184 { 1185 struct inpcb *inp; 1186 int s; 1187 int error = 0; 1188 1189 if (req == PRU_CONTROL) 1190 return (in_control(so, (long)m, (void *)nam, 1191 (struct ifnet *)control, l)); 1192 1193 s = splsoftnet(); 1194 1195 if (req == PRU_PURGEIF) { 1196 mutex_enter(softnet_lock); 1197 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1198 in_purgeif((struct ifnet *)control); 1199 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1200 mutex_exit(softnet_lock); 1201 splx(s); 1202 return (0); 1203 } 1204 1205 inp = sotoinpcb(so); 1206 #ifdef DIAGNOSTIC 1207 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1208 panic("udp_usrreq: unexpected control mbuf"); 1209 #endif 1210 if (req == PRU_ATTACH) { 1211 sosetlock(so); 1212 } else if (inp == 0) { 1213 error = EINVAL; 1214 goto release; 1215 } 1216 1217 /* 1218 * Note: need to block udp_input while changing 1219 * the udp pcb queue and/or pcb addresses. 1220 */ 1221 switch (req) { 1222 1223 case PRU_ATTACH: 1224 if (inp != 0) { 1225 error = EISCONN; 1226 break; 1227 } 1228 #ifdef MBUFTRACE 1229 so->so_mowner = &udp_mowner; 1230 so->so_rcv.sb_mowner = &udp_rx_mowner; 1231 so->so_snd.sb_mowner = &udp_tx_mowner; 1232 #endif 1233 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1234 error = soreserve(so, udp_sendspace, udp_recvspace); 1235 if (error) 1236 break; 1237 } 1238 error = in_pcballoc(so, &udbtable); 1239 if (error) 1240 break; 1241 inp = sotoinpcb(so); 1242 inp->inp_ip.ip_ttl = ip_defttl; 1243 break; 1244 1245 case PRU_DETACH: 1246 in_pcbdetach(inp); 1247 break; 1248 1249 case PRU_BIND: 1250 error = in_pcbbind(inp, nam, l); 1251 break; 1252 1253 case PRU_LISTEN: 1254 error = EOPNOTSUPP; 1255 break; 1256 1257 case PRU_CONNECT: 1258 error = in_pcbconnect(inp, nam, l); 1259 if (error) 1260 break; 1261 soisconnected(so); 1262 break; 1263 1264 case PRU_CONNECT2: 1265 error = EOPNOTSUPP; 1266 break; 1267 1268 case PRU_DISCONNECT: 1269 /*soisdisconnected(so);*/ 1270 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1271 in_pcbdisconnect(inp); 1272 inp->inp_laddr = zeroin_addr; /* XXX */ 1273 in_pcbstate(inp, INP_BOUND); /* XXX */ 1274 break; 1275 1276 case PRU_SHUTDOWN: 1277 socantsendmore(so); 1278 break; 1279 1280 case PRU_RCVD: 1281 error = EOPNOTSUPP; 1282 break; 1283 1284 case PRU_SEND: 1285 if (control && control->m_len) { 1286 m_freem(control); 1287 m_freem(m); 1288 error = EINVAL; 1289 break; 1290 } 1291 { 1292 struct in_addr laddr; /* XXX */ 1293 1294 memset(&laddr, 0, sizeof laddr); 1295 if (nam) { 1296 laddr = inp->inp_laddr; /* XXX */ 1297 if ((so->so_state & SS_ISCONNECTED) != 0) { 1298 error = EISCONN; 1299 goto die; 1300 } 1301 error = in_pcbconnect(inp, nam, l); 1302 if (error) 1303 goto die; 1304 } else { 1305 if ((so->so_state & SS_ISCONNECTED) == 0) { 1306 error = ENOTCONN; 1307 goto die; 1308 } 1309 } 1310 error = udp_output(m, inp); 1311 m = NULL; 1312 if (nam) { 1313 in_pcbdisconnect(inp); 1314 inp->inp_laddr = laddr; /* XXX */ 1315 in_pcbstate(inp, INP_BOUND); /* XXX */ 1316 } 1317 die: 1318 if (m) 1319 m_freem(m); 1320 } 1321 break; 1322 1323 case PRU_SENSE: 1324 /* 1325 * stat: don't bother with a blocksize. 1326 */ 1327 splx(s); 1328 return (0); 1329 1330 case PRU_RCVOOB: 1331 error = EOPNOTSUPP; 1332 break; 1333 1334 case PRU_SENDOOB: 1335 m_freem(control); 1336 m_freem(m); 1337 error = EOPNOTSUPP; 1338 break; 1339 1340 case PRU_SOCKADDR: 1341 in_setsockaddr(inp, nam); 1342 break; 1343 1344 case PRU_PEERADDR: 1345 in_setpeeraddr(inp, nam); 1346 break; 1347 1348 default: 1349 panic("udp_usrreq"); 1350 } 1351 1352 release: 1353 splx(s); 1354 return (error); 1355 } 1356 1357 static int 1358 sysctl_net_inet_udp_stats(SYSCTLFN_ARGS) 1359 { 1360 1361 return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS)); 1362 } 1363 1364 /* 1365 * Sysctl for udp variables. 1366 */ 1367 static void 1368 sysctl_net_inet_udp_setup(struct sysctllog **clog) 1369 { 1370 sysctl_createv(clog, 0, NULL, NULL, 1371 CTLFLAG_PERMANENT, 1372 CTLTYPE_NODE, "net", NULL, 1373 NULL, 0, NULL, 0, 1374 CTL_NET, CTL_EOL); 1375 sysctl_createv(clog, 0, NULL, NULL, 1376 CTLFLAG_PERMANENT, 1377 CTLTYPE_NODE, "inet", NULL, 1378 NULL, 0, NULL, 0, 1379 CTL_NET, PF_INET, CTL_EOL); 1380 sysctl_createv(clog, 0, NULL, NULL, 1381 CTLFLAG_PERMANENT, 1382 CTLTYPE_NODE, "udp", 1383 SYSCTL_DESCR("UDPv4 related settings"), 1384 NULL, 0, NULL, 0, 1385 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1386 1387 sysctl_createv(clog, 0, NULL, NULL, 1388 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1389 CTLTYPE_INT, "checksum", 1390 SYSCTL_DESCR("Compute UDP checksums"), 1391 NULL, 0, &udpcksum, 0, 1392 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1393 CTL_EOL); 1394 sysctl_createv(clog, 0, NULL, NULL, 1395 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1396 CTLTYPE_INT, "sendspace", 1397 SYSCTL_DESCR("Default UDP send buffer size"), 1398 NULL, 0, &udp_sendspace, 0, 1399 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1400 CTL_EOL); 1401 sysctl_createv(clog, 0, NULL, NULL, 1402 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1403 CTLTYPE_INT, "recvspace", 1404 SYSCTL_DESCR("Default UDP receive buffer size"), 1405 NULL, 0, &udp_recvspace, 0, 1406 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1407 CTL_EOL); 1408 sysctl_createv(clog, 0, NULL, NULL, 1409 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1410 CTLTYPE_INT, "do_loopback_cksum", 1411 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1412 NULL, 0, &udp_do_loopback_cksum, 0, 1413 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1414 CTL_EOL); 1415 sysctl_createv(clog, 0, NULL, NULL, 1416 CTLFLAG_PERMANENT, 1417 CTLTYPE_STRUCT, "pcblist", 1418 SYSCTL_DESCR("UDP protocol control block list"), 1419 sysctl_inpcblist, 0, &udbtable, 0, 1420 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1421 CTL_EOL); 1422 sysctl_createv(clog, 0, NULL, NULL, 1423 CTLFLAG_PERMANENT, 1424 CTLTYPE_STRUCT, "stats", 1425 SYSCTL_DESCR("UDP statistics"), 1426 sysctl_net_inet_udp_stats, 0, NULL, 0, 1427 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1428 CTL_EOL); 1429 } 1430 #endif 1431 1432 void 1433 udp_statinc(u_int stat) 1434 { 1435 1436 KASSERT(stat < UDP_NSTATS); 1437 UDP_STATINC(stat); 1438 } 1439 1440 #if (defined INET && defined IPSEC_NAT_T) 1441 /* 1442 * Returns: 1443 * 1 if the packet was processed 1444 * 0 if normal UDP processing should take place 1445 * -1 if an error occurent and m was freed 1446 */ 1447 static int 1448 udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src, 1449 struct socket *so) 1450 { 1451 size_t len; 1452 void *data; 1453 struct inpcb *inp; 1454 size_t skip = 0; 1455 size_t minlen; 1456 size_t iphdrlen; 1457 struct ip *ip; 1458 struct mbuf *n; 1459 struct m_tag *tag; 1460 struct udphdr *udphdr; 1461 u_int16_t sport, dport; 1462 struct mbuf *m = *mp; 1463 1464 /* 1465 * Collapse the mbuf chain if the first mbuf is too short 1466 * The longest case is: UDP + non ESP marker + ESP 1467 */ 1468 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1469 if (minlen > m->m_pkthdr.len) 1470 minlen = m->m_pkthdr.len; 1471 1472 if (m->m_len < minlen) { 1473 if ((*mp = m_pullup(m, minlen)) == NULL) { 1474 printf("udp4_espinudp: m_pullup failed\n"); 1475 return -1; 1476 } 1477 m = *mp; 1478 } 1479 1480 len = m->m_len - off; 1481 data = mtod(m, char *) + off; 1482 inp = sotoinpcb(so); 1483 1484 /* Ignore keepalive packets */ 1485 if ((len == 1) && (*(unsigned char *)data == 0xff)) { 1486 return 1; 1487 } 1488 1489 /* 1490 * Check that the payload is long enough to hold 1491 * an ESP header and compute the length of encapsulation 1492 * header to remove 1493 */ 1494 if (inp->inp_flags & INP_ESPINUDP) { 1495 u_int32_t *st = (u_int32_t *)data; 1496 1497 if ((len <= sizeof(struct esp)) || (*st == 0)) 1498 return 0; /* Normal UDP processing */ 1499 1500 skip = sizeof(struct udphdr); 1501 } 1502 1503 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1504 u_int32_t *st = (u_int32_t *)data; 1505 1506 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1507 || ((st[0] | st[1]) != 0)) 1508 return 0; /* Normal UDP processing */ 1509 1510 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1511 } 1512 1513 /* 1514 * Get the UDP ports. They are handled in network 1515 * order everywhere in IPSEC_NAT_T code. 1516 */ 1517 udphdr = (struct udphdr *)((char *)data - skip); 1518 sport = udphdr->uh_sport; 1519 dport = udphdr->uh_dport; 1520 1521 /* 1522 * Remove the UDP header (and possibly the non ESP marker) 1523 * IP header lendth is iphdrlen 1524 * Before: 1525 * <--- off ---> 1526 * +----+------+-----+ 1527 * | IP | UDP | ESP | 1528 * +----+------+-----+ 1529 * <-skip-> 1530 * After: 1531 * +----+-----+ 1532 * | IP | ESP | 1533 * +----+-----+ 1534 * <-skip-> 1535 */ 1536 iphdrlen = off - sizeof(struct udphdr); 1537 memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen); 1538 m_adj(m, skip); 1539 1540 ip = mtod(m, struct ip *); 1541 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1542 ip->ip_p = IPPROTO_ESP; 1543 1544 /* 1545 * Copy the mbuf to avoid multiple free, as both 1546 * esp4_input (which we call) and udp_input (which 1547 * called us) free the mbuf. 1548 */ 1549 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1550 printf("udp4_espinudp: m_dup failed\n"); 1551 return 0; 1552 } 1553 1554 /* 1555 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1556 * the source UDP port. This is required if we want 1557 * to select the right SPD for multiple hosts behind 1558 * same NAT 1559 */ 1560 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1561 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1562 printf("udp4_espinudp: m_tag_get failed\n"); 1563 m_freem(n); 1564 return 0; 1565 } 1566 ((u_int16_t *)(tag + 1))[0] = sport; 1567 ((u_int16_t *)(tag + 1))[1] = dport; 1568 m_tag_prepend(n, tag); 1569 1570 #ifdef FAST_IPSEC 1571 ipsec4_common_input(n, iphdrlen, IPPROTO_ESP); 1572 #else 1573 esp4_input(n, iphdrlen); 1574 #endif 1575 1576 /* We handled it, it shouldn't be handled by UDP */ 1577 return 1; 1578 } 1579 #endif 1580