1 /* $NetBSD: udp_usrreq.c,v 1.168 2008/04/15 04:43:25 thorpej 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 1.168 2008/04/15 04:43:25 thorpej 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> /* XXX ipsecstat namespace */ 125 #include <netipsec/esp.h> 126 #ifdef INET6 127 #include <netipsec/ipsec6.h> 128 #endif 129 #endif /* FAST_IPSEC*/ 130 131 #ifdef IPSEC 132 #include <netinet6/ipsec.h> 133 #include <netinet6/esp.h> 134 #include <netkey/key.h> 135 #endif /*IPSEC*/ 136 137 #ifdef IPKDB 138 #include <ipkdb/ipkdb.h> 139 #endif 140 141 /* 142 * UDP protocol implementation. 143 * Per RFC 768, August, 1980. 144 */ 145 int udpcksum = 1; 146 int udp_do_loopback_cksum = 0; 147 148 struct inpcbtable udbtable; 149 150 percpu_t *udpstat_percpu; 151 152 #ifdef INET 153 #ifdef IPSEC_NAT_T 154 static int udp4_espinudp (struct mbuf **, int, struct sockaddr *, 155 struct socket *); 156 #endif 157 static void udp4_sendup (struct mbuf *, int, struct sockaddr *, 158 struct socket *); 159 static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, 160 struct mbuf **, int); 161 static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); 162 #endif 163 #ifdef INET6 164 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 165 struct socket *); 166 static int udp6_realinput (int, struct sockaddr_in6 *, 167 struct sockaddr_in6 *, struct mbuf *, int); 168 static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int); 169 #endif 170 #ifdef INET 171 static void udp_notify (struct inpcb *, int); 172 #endif 173 174 #ifndef UDBHASHSIZE 175 #define UDBHASHSIZE 128 176 #endif 177 int udbhashsize = UDBHASHSIZE; 178 179 #ifdef MBUFTRACE 180 struct mowner udp_mowner = MOWNER_INIT("udp", ""); 181 struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx"); 182 struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx"); 183 #endif 184 185 #ifdef UDP_CSUM_COUNTERS 186 #include <sys/device.h> 187 188 #if defined(INET) 189 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 190 NULL, "udp", "hwcsum bad"); 191 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 192 NULL, "udp", "hwcsum ok"); 193 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 194 NULL, "udp", "hwcsum data"); 195 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 196 NULL, "udp", "swcsum"); 197 198 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 199 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 200 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 201 EVCNT_ATTACH_STATIC(udp_swcsum); 202 #endif /* defined(INET) */ 203 204 #if defined(INET6) 205 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 206 NULL, "udp6", "hwcsum bad"); 207 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 208 NULL, "udp6", "hwcsum ok"); 209 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 210 NULL, "udp6", "hwcsum data"); 211 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 212 NULL, "udp6", "swcsum"); 213 214 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 215 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 216 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 217 EVCNT_ATTACH_STATIC(udp6_swcsum); 218 #endif /* defined(INET6) */ 219 220 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 221 222 #else 223 224 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 225 226 #endif /* UDP_CSUM_COUNTERS */ 227 228 void 229 udp_init(void) 230 { 231 232 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 233 234 MOWNER_ATTACH(&udp_tx_mowner); 235 MOWNER_ATTACH(&udp_rx_mowner); 236 MOWNER_ATTACH(&udp_mowner); 237 238 udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS); 239 } 240 241 /* 242 * Checksum extended UDP header and data. 243 */ 244 245 int 246 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 247 int iphlen, int len) 248 { 249 250 switch (af) { 251 #ifdef INET 252 case AF_INET: 253 return udp4_input_checksum(m, uh, iphlen, len); 254 #endif 255 #ifdef INET6 256 case AF_INET6: 257 return udp6_input_checksum(m, uh, iphlen, len); 258 #endif 259 } 260 #ifdef DIAGNOSTIC 261 panic("udp_input_checksum: unknown af %d", af); 262 #endif 263 /* NOTREACHED */ 264 return -1; 265 } 266 267 #ifdef INET 268 269 /* 270 * Checksum extended UDP header and data. 271 */ 272 273 static int 274 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 275 int iphlen, int len) 276 { 277 278 /* 279 * XXX it's better to record and check if this mbuf is 280 * already checked. 281 */ 282 283 if (uh->uh_sum == 0) 284 return 0; 285 286 switch (m->m_pkthdr.csum_flags & 287 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 288 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 289 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 290 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 291 goto badcsum; 292 293 case M_CSUM_UDPv4|M_CSUM_DATA: { 294 u_int32_t hw_csum = m->m_pkthdr.csum_data; 295 296 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 297 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 298 const struct ip *ip = 299 mtod(m, const struct ip *); 300 301 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 302 ip->ip_dst.s_addr, 303 htons(hw_csum + len + IPPROTO_UDP)); 304 } 305 if ((hw_csum ^ 0xffff) != 0) 306 goto badcsum; 307 break; 308 } 309 310 case M_CSUM_UDPv4: 311 /* Checksum was okay. */ 312 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 313 break; 314 315 default: 316 /* 317 * Need to compute it ourselves. Maybe skip checksum 318 * on loopback interfaces. 319 */ 320 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 321 IFF_LOOPBACK) || 322 udp_do_loopback_cksum)) { 323 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 324 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 325 goto badcsum; 326 } 327 break; 328 } 329 330 return 0; 331 332 badcsum: 333 UDP_STATINC(UDP_STAT_BADSUM); 334 return -1; 335 } 336 337 void 338 udp_input(struct mbuf *m, ...) 339 { 340 va_list ap; 341 struct sockaddr_in src, dst; 342 struct ip *ip; 343 struct udphdr *uh; 344 int iphlen; 345 int len; 346 int n; 347 u_int16_t ip_len; 348 349 va_start(ap, m); 350 iphlen = va_arg(ap, int); 351 (void)va_arg(ap, int); /* ignore value, advance ap */ 352 va_end(ap); 353 354 MCLAIM(m, &udp_rx_mowner); 355 UDP_STATINC(UDP_STAT_IPACKETS); 356 357 /* 358 * Get IP and UDP header together in first mbuf. 359 */ 360 ip = mtod(m, struct ip *); 361 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 362 if (uh == NULL) { 363 UDP_STATINC(UDP_STAT_HDROPS); 364 return; 365 } 366 KASSERT(UDP_HDR_ALIGNED_P(uh)); 367 368 /* destination port of 0 is illegal, based on RFC768. */ 369 if (uh->uh_dport == 0) 370 goto bad; 371 372 /* 373 * Make mbuf data length reflect UDP length. 374 * If not enough data to reflect UDP length, drop. 375 */ 376 ip_len = ntohs(ip->ip_len); 377 len = ntohs((u_int16_t)uh->uh_ulen); 378 if (ip_len != iphlen + len) { 379 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 380 UDP_STATINC(UDP_STAT_BADLEN); 381 goto bad; 382 } 383 m_adj(m, iphlen + len - ip_len); 384 } 385 386 /* 387 * Checksum extended UDP header and data. 388 */ 389 if (udp4_input_checksum(m, uh, iphlen, len)) 390 goto badcsum; 391 392 /* construct source and dst sockaddrs. */ 393 sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport); 394 sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport); 395 396 if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { 397 UDP_STATINC(UDP_STAT_HDROPS); 398 return; 399 } 400 #ifdef INET6 401 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 402 struct sockaddr_in6 src6, dst6; 403 404 bzero(&src6, sizeof(src6)); 405 src6.sin6_family = AF_INET6; 406 src6.sin6_len = sizeof(struct sockaddr_in6); 407 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 408 bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], 409 sizeof(ip->ip_src)); 410 src6.sin6_port = uh->uh_sport; 411 bzero(&dst6, sizeof(dst6)); 412 dst6.sin6_family = AF_INET6; 413 dst6.sin6_len = sizeof(struct sockaddr_in6); 414 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 415 bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], 416 sizeof(ip->ip_dst)); 417 dst6.sin6_port = uh->uh_dport; 418 419 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 420 } 421 #endif 422 423 if (n == 0) { 424 if (m->m_flags & (M_BCAST | M_MCAST)) { 425 UDP_STATINC(UDP_STAT_NOPORTBCAST); 426 goto bad; 427 } 428 UDP_STATINC(UDP_STAT_NOPORT); 429 #ifdef IPKDB 430 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 431 m, iphlen + sizeof(struct udphdr), 432 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 433 /* 434 * It was a debugger connect packet, 435 * just drop it now 436 */ 437 goto bad; 438 } 439 #endif 440 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 441 m = NULL; 442 } 443 444 bad: 445 if (m) 446 m_freem(m); 447 return; 448 449 badcsum: 450 m_freem(m); 451 } 452 #endif 453 454 #ifdef INET6 455 static int 456 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 457 { 458 459 /* 460 * XXX it's better to record and check if this mbuf is 461 * already checked. 462 */ 463 464 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 465 goto good; 466 } 467 if (uh->uh_sum == 0) { 468 UDP6_STATINC(UDP6_STAT_NOSUM); 469 goto bad; 470 } 471 472 switch (m->m_pkthdr.csum_flags & 473 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 474 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 475 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 476 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 477 UDP6_STATINC(UDP6_STAT_BADSUM); 478 goto bad; 479 480 #if 0 /* notyet */ 481 case M_CSUM_UDPv6|M_CSUM_DATA: 482 #endif 483 484 case M_CSUM_UDPv6: 485 /* Checksum was okay. */ 486 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 487 break; 488 489 default: 490 /* 491 * Need to compute it ourselves. Maybe skip checksum 492 * on loopback interfaces. 493 */ 494 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 495 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 496 UDP6_STATINC(UDP6_STAT_BADSUM); 497 goto bad; 498 } 499 } 500 501 good: 502 return 0; 503 bad: 504 return -1; 505 } 506 507 int 508 udp6_input(struct mbuf **mp, int *offp, int proto) 509 { 510 struct mbuf *m = *mp; 511 int off = *offp; 512 struct sockaddr_in6 src, dst; 513 struct ip6_hdr *ip6; 514 struct udphdr *uh; 515 u_int32_t plen, ulen; 516 517 ip6 = mtod(m, struct ip6_hdr *); 518 519 #if defined(NFAITH) && 0 < NFAITH 520 if (faithprefix(&ip6->ip6_dst)) { 521 /* send icmp6 host unreach? */ 522 m_freem(m); 523 return IPPROTO_DONE; 524 } 525 #endif 526 527 UDP6_STATINC(UDP6_STAT_IPACKETS); 528 529 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 530 plen = m->m_pkthdr.len - off; 531 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 532 if (uh == NULL) { 533 IP6_STATINC(IP6_STAT_TOOSHORT); 534 return IPPROTO_DONE; 535 } 536 KASSERT(UDP_HDR_ALIGNED_P(uh)); 537 ulen = ntohs((u_short)uh->uh_ulen); 538 /* 539 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 540 * iff payload length > 0xffff. 541 */ 542 if (ulen == 0 && plen > 0xffff) 543 ulen = plen; 544 545 if (plen != ulen) { 546 UDP6_STATINC(UDP6_STAT_BADLEN); 547 goto bad; 548 } 549 550 /* destination port of 0 is illegal, based on RFC768. */ 551 if (uh->uh_dport == 0) 552 goto bad; 553 554 /* Be proactive about malicious use of IPv4 mapped address */ 555 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 556 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 557 /* XXX stat */ 558 goto bad; 559 } 560 561 /* 562 * Checksum extended UDP header and data. Maybe skip checksum 563 * on loopback interfaces. 564 */ 565 if (udp6_input_checksum(m, uh, off, ulen)) 566 goto bad; 567 568 /* 569 * Construct source and dst sockaddrs. 570 */ 571 bzero(&src, sizeof(src)); 572 src.sin6_family = AF_INET6; 573 src.sin6_len = sizeof(struct sockaddr_in6); 574 src.sin6_addr = ip6->ip6_src; 575 src.sin6_port = uh->uh_sport; 576 bzero(&dst, sizeof(dst)); 577 dst.sin6_family = AF_INET6; 578 dst.sin6_len = sizeof(struct sockaddr_in6); 579 dst.sin6_addr = ip6->ip6_dst; 580 dst.sin6_port = uh->uh_dport; 581 582 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 583 if (m->m_flags & M_MCAST) { 584 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 585 goto bad; 586 } 587 UDP6_STATINC(UDP6_STAT_NOPORT); 588 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 589 m = NULL; 590 } 591 592 bad: 593 if (m) 594 m_freem(m); 595 return IPPROTO_DONE; 596 } 597 #endif 598 599 #ifdef INET 600 static void 601 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 602 struct sockaddr *src, struct socket *so) 603 { 604 struct mbuf *opts = NULL; 605 struct mbuf *n; 606 struct inpcb *inp = NULL; 607 608 if (!so) 609 return; 610 switch (so->so_proto->pr_domain->dom_family) { 611 case AF_INET: 612 inp = sotoinpcb(so); 613 break; 614 #ifdef INET6 615 case AF_INET6: 616 break; 617 #endif 618 default: 619 return; 620 } 621 622 #if defined(IPSEC) || defined(FAST_IPSEC) 623 /* check AH/ESP integrity. */ 624 if (so != NULL && ipsec4_in_reject_so(m, so)) { 625 ipsecstat.in_polvio++; 626 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 627 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 628 0, 0); 629 return; 630 } 631 #endif /*IPSEC*/ 632 633 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 634 if (inp && (inp->inp_flags & INP_CONTROLOPTS 635 || so->so_options & SO_TIMESTAMP)) { 636 struct ip *ip = mtod(n, struct ip *); 637 ip_savecontrol(inp, &opts, ip, n); 638 } 639 640 m_adj(n, off); 641 if (sbappendaddr(&so->so_rcv, src, n, 642 opts) == 0) { 643 m_freem(n); 644 if (opts) 645 m_freem(opts); 646 so->so_rcv.sb_overflowed++; 647 UDP_STATINC(UDP_STAT_FULLSOCK); 648 } else 649 sorwakeup(so); 650 } 651 } 652 #endif 653 654 #ifdef INET6 655 static void 656 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 657 struct sockaddr *src, struct socket *so) 658 { 659 struct mbuf *opts = NULL; 660 struct mbuf *n; 661 struct in6pcb *in6p = NULL; 662 663 if (!so) 664 return; 665 if (so->so_proto->pr_domain->dom_family != AF_INET6) 666 return; 667 in6p = sotoin6pcb(so); 668 669 #if defined(IPSEC) || defined(FAST_IPSEC) 670 /* check AH/ESP integrity. */ 671 if (so != NULL && ipsec6_in_reject_so(m, so)) { 672 ipsec6stat.in_polvio++; 673 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 674 icmp6_error(n, ICMP6_DST_UNREACH, 675 ICMP6_DST_UNREACH_ADMIN, 0); 676 return; 677 } 678 #endif /*IPSEC*/ 679 680 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 681 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 682 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 683 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 684 ip6_savecontrol(in6p, &opts, ip6, n); 685 } 686 687 m_adj(n, off); 688 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 689 m_freem(n); 690 if (opts) 691 m_freem(opts); 692 so->so_rcv.sb_overflowed++; 693 UDP6_STATINC(UDP6_STAT_FULLSOCK); 694 } else 695 sorwakeup(so); 696 } 697 } 698 #endif 699 700 #ifdef INET 701 static int 702 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 703 struct mbuf **mp, int off /* offset of udphdr */) 704 { 705 u_int16_t *sport, *dport; 706 int rcvcnt; 707 struct in_addr *src4, *dst4; 708 struct inpcb_hdr *inph; 709 struct inpcb *inp; 710 struct mbuf *m = *mp; 711 712 rcvcnt = 0; 713 off += sizeof(struct udphdr); /* now, offset of payload */ 714 715 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 716 goto bad; 717 718 src4 = &src->sin_addr; 719 sport = &src->sin_port; 720 dst4 = &dst->sin_addr; 721 dport = &dst->sin_port; 722 723 if (IN_MULTICAST(dst4->s_addr) || 724 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 725 /* 726 * Deliver a multicast or broadcast datagram to *all* sockets 727 * for which the local and remote addresses and ports match 728 * those of the incoming datagram. This allows more than 729 * one process to receive multi/broadcasts on the same port. 730 * (This really ought to be done for unicast datagrams as 731 * well, but that would cause problems with existing 732 * applications that open both address-specific sockets and 733 * a wildcard socket listening to the same port -- they would 734 * end up receiving duplicates of every unicast datagram. 735 * Those applications open the multiple sockets to overcome an 736 * inadequacy of the UDP socket interface, but for backwards 737 * compatibility we avoid the problem here rather than 738 * fixing the interface. Maybe 4.5BSD will remedy this?) 739 */ 740 741 /* 742 * KAME note: traditionally we dropped udpiphdr from mbuf here. 743 * we need udpiphdr for IPsec processing so we do that later. 744 */ 745 /* 746 * Locate pcb(s) for datagram. 747 */ 748 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 749 inp = (struct inpcb *)inph; 750 if (inp->inp_af != AF_INET) 751 continue; 752 753 if (inp->inp_lport != *dport) 754 continue; 755 if (!in_nullhost(inp->inp_laddr)) { 756 if (!in_hosteq(inp->inp_laddr, *dst4)) 757 continue; 758 } 759 if (!in_nullhost(inp->inp_faddr)) { 760 if (!in_hosteq(inp->inp_faddr, *src4) || 761 inp->inp_fport != *sport) 762 continue; 763 } 764 765 udp4_sendup(m, off, (struct sockaddr *)src, 766 inp->inp_socket); 767 rcvcnt++; 768 769 /* 770 * Don't look for additional matches if this one does 771 * not have either the SO_REUSEPORT or SO_REUSEADDR 772 * socket options set. This heuristic avoids searching 773 * through all pcbs in the common case of a non-shared 774 * port. It assumes that an application will never 775 * clear these options after setting them. 776 */ 777 if ((inp->inp_socket->so_options & 778 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 779 break; 780 } 781 } else { 782 /* 783 * Locate pcb for datagram. 784 */ 785 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); 786 if (inp == 0) { 787 UDP_STATINC(UDP_STAT_PCBHASHMISS); 788 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 789 if (inp == 0) 790 return rcvcnt; 791 } 792 793 #ifdef IPSEC_NAT_T 794 /* Handle ESP over UDP */ 795 if (inp->inp_flags & INP_ESPINUDP_ALL) { 796 struct sockaddr *sa = (struct sockaddr *)src; 797 798 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 799 case -1: /* Error, m was freeed */ 800 rcvcnt = -1; 801 goto bad; 802 break; 803 804 case 1: /* ESP over UDP */ 805 rcvcnt++; 806 goto bad; 807 break; 808 809 case 0: /* plain UDP */ 810 default: /* Unexpected */ 811 /* 812 * Normal UDP processing will take place 813 * m may have changed. 814 */ 815 m = *mp; 816 break; 817 } 818 } 819 #endif 820 821 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 822 rcvcnt++; 823 } 824 825 bad: 826 return rcvcnt; 827 } 828 #endif 829 830 #ifdef INET6 831 static int 832 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 833 struct mbuf *m, int off) 834 { 835 u_int16_t sport, dport; 836 int rcvcnt; 837 struct in6_addr src6, *dst6; 838 const struct in_addr *dst4; 839 struct inpcb_hdr *inph; 840 struct in6pcb *in6p; 841 842 rcvcnt = 0; 843 off += sizeof(struct udphdr); /* now, offset of payload */ 844 845 if (af != AF_INET && af != AF_INET6) 846 goto bad; 847 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 848 goto bad; 849 850 src6 = src->sin6_addr; 851 if (sa6_recoverscope(src) != 0) { 852 /* XXX: should be impossible. */ 853 goto bad; 854 } 855 sport = src->sin6_port; 856 857 dport = dst->sin6_port; 858 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 859 dst6 = &dst->sin6_addr; 860 861 if (IN6_IS_ADDR_MULTICAST(dst6) || 862 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 863 /* 864 * Deliver a multicast or broadcast datagram to *all* sockets 865 * for which the local and remote addresses and ports match 866 * those of the incoming datagram. This allows more than 867 * one process to receive multi/broadcasts on the same port. 868 * (This really ought to be done for unicast datagrams as 869 * well, but that would cause problems with existing 870 * applications that open both address-specific sockets and 871 * a wildcard socket listening to the same port -- they would 872 * end up receiving duplicates of every unicast datagram. 873 * Those applications open the multiple sockets to overcome an 874 * inadequacy of the UDP socket interface, but for backwards 875 * compatibility we avoid the problem here rather than 876 * fixing the interface. Maybe 4.5BSD will remedy this?) 877 */ 878 879 /* 880 * KAME note: traditionally we dropped udpiphdr from mbuf here. 881 * we need udpiphdr for IPsec processing so we do that later. 882 */ 883 /* 884 * Locate pcb(s) for datagram. 885 */ 886 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 887 in6p = (struct in6pcb *)inph; 888 if (in6p->in6p_af != AF_INET6) 889 continue; 890 891 if (in6p->in6p_lport != dport) 892 continue; 893 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 894 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 895 dst6)) 896 continue; 897 } else { 898 if (IN6_IS_ADDR_V4MAPPED(dst6) && 899 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 900 continue; 901 } 902 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 903 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 904 &src6) || in6p->in6p_fport != sport) 905 continue; 906 } else { 907 if (IN6_IS_ADDR_V4MAPPED(&src6) && 908 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 909 continue; 910 } 911 912 udp6_sendup(m, off, (struct sockaddr *)src, 913 in6p->in6p_socket); 914 rcvcnt++; 915 916 /* 917 * Don't look for additional matches if this one does 918 * not have either the SO_REUSEPORT or SO_REUSEADDR 919 * socket options set. This heuristic avoids searching 920 * through all pcbs in the common case of a non-shared 921 * port. It assumes that an application will never 922 * clear these options after setting them. 923 */ 924 if ((in6p->in6p_socket->so_options & 925 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 926 break; 927 } 928 } else { 929 /* 930 * Locate pcb for datagram. 931 */ 932 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 933 dport, 0); 934 if (in6p == 0) { 935 UDP_STATINC(UDP_STAT_PCBHASHMISS); 936 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 937 if (in6p == 0) 938 return rcvcnt; 939 } 940 941 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 942 rcvcnt++; 943 } 944 945 bad: 946 return rcvcnt; 947 } 948 #endif 949 950 #ifdef INET 951 /* 952 * Notify a udp user of an asynchronous error; 953 * just wake up so that he can collect error status. 954 */ 955 static void 956 udp_notify(struct inpcb *inp, int errno) 957 { 958 inp->inp_socket->so_error = errno; 959 sorwakeup(inp->inp_socket); 960 sowwakeup(inp->inp_socket); 961 } 962 963 void * 964 udp_ctlinput(int cmd, const struct sockaddr *sa, void *v) 965 { 966 struct ip *ip = v; 967 struct udphdr *uh; 968 void (*notify)(struct inpcb *, int) = udp_notify; 969 int errno; 970 971 if (sa->sa_family != AF_INET 972 || sa->sa_len != sizeof(struct sockaddr_in)) 973 return NULL; 974 if ((unsigned)cmd >= PRC_NCMDS) 975 return NULL; 976 errno = inetctlerrmap[cmd]; 977 if (PRC_IS_REDIRECT(cmd)) 978 notify = in_rtchange, ip = 0; 979 else if (cmd == PRC_HOSTDEAD) 980 ip = 0; 981 else if (errno == 0) 982 return NULL; 983 if (ip) { 984 uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2)); 985 in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport, 986 ip->ip_src, uh->uh_sport, errno, notify); 987 988 /* XXX mapped address case */ 989 } else 990 in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno, 991 notify); 992 return NULL; 993 } 994 995 int 996 udp_ctloutput(int op, struct socket *so, int level, int optname, 997 struct mbuf **mp) 998 { 999 int s; 1000 int error = 0; 1001 struct mbuf *m; 1002 struct inpcb *inp; 1003 int family; 1004 1005 family = so->so_proto->pr_domain->dom_family; 1006 1007 s = splsoftnet(); 1008 switch (family) { 1009 #ifdef INET 1010 case PF_INET: 1011 if (level != IPPROTO_UDP) { 1012 error = ip_ctloutput(op, so, level, optname, mp); 1013 goto end; 1014 } 1015 break; 1016 #endif 1017 #ifdef INET6 1018 case PF_INET6: 1019 if (level != IPPROTO_UDP) { 1020 error = ip6_ctloutput(op, so, level, optname, mp); 1021 goto end; 1022 } 1023 break; 1024 #endif 1025 default: 1026 error = EAFNOSUPPORT; 1027 goto end; 1028 } 1029 1030 1031 switch (op) { 1032 case PRCO_SETOPT: 1033 m = *mp; 1034 inp = sotoinpcb(so); 1035 1036 switch (optname) { 1037 case UDP_ENCAP: 1038 if (m == NULL || m->m_len != sizeof(int)) { 1039 error = EINVAL; 1040 break; 1041 } 1042 1043 switch(*mtod(m, int *)) { 1044 #ifdef IPSEC_NAT_T 1045 case 0: 1046 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1047 break; 1048 1049 case UDP_ENCAP_ESPINUDP: 1050 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1051 inp->inp_flags |= INP_ESPINUDP; 1052 break; 1053 1054 case UDP_ENCAP_ESPINUDP_NON_IKE: 1055 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1056 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1057 break; 1058 #endif 1059 default: 1060 error = EINVAL; 1061 break; 1062 } 1063 break; 1064 1065 default: 1066 error = ENOPROTOOPT; 1067 break; 1068 } 1069 if (m != NULL) { 1070 m_free(m); 1071 } 1072 break; 1073 1074 default: 1075 error = EINVAL; 1076 break; 1077 } 1078 1079 end: 1080 splx(s); 1081 return error; 1082 } 1083 1084 1085 int 1086 udp_output(struct mbuf *m, ...) 1087 { 1088 struct inpcb *inp; 1089 struct udpiphdr *ui; 1090 struct route *ro; 1091 int len = m->m_pkthdr.len; 1092 int error = 0; 1093 va_list ap; 1094 1095 MCLAIM(m, &udp_tx_mowner); 1096 va_start(ap, m); 1097 inp = va_arg(ap, struct inpcb *); 1098 va_end(ap); 1099 1100 /* 1101 * Calculate data length and get a mbuf 1102 * for UDP and IP headers. 1103 */ 1104 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1105 if (m == 0) { 1106 error = ENOBUFS; 1107 goto release; 1108 } 1109 1110 /* 1111 * Compute the packet length of the IP header, and 1112 * punt if the length looks bogus. 1113 */ 1114 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1115 error = EMSGSIZE; 1116 goto release; 1117 } 1118 1119 /* 1120 * Fill in mbuf with extended UDP header 1121 * and addresses and length put into network format. 1122 */ 1123 ui = mtod(m, struct udpiphdr *); 1124 ui->ui_pr = IPPROTO_UDP; 1125 ui->ui_src = inp->inp_laddr; 1126 ui->ui_dst = inp->inp_faddr; 1127 ui->ui_sport = inp->inp_lport; 1128 ui->ui_dport = inp->inp_fport; 1129 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1130 1131 ro = &inp->inp_route; 1132 1133 /* 1134 * Set up checksum and output datagram. 1135 */ 1136 if (udpcksum) { 1137 /* 1138 * XXX Cache pseudo-header checksum part for 1139 * XXX "connected" UDP sockets. 1140 */ 1141 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1142 ui->ui_dst.s_addr, htons((u_int16_t)len + 1143 sizeof(struct udphdr) + IPPROTO_UDP)); 1144 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1145 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1146 } else 1147 ui->ui_sum = 0; 1148 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1149 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1150 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1151 UDP_STATINC(UDP_STAT_OPACKETS); 1152 1153 return (ip_output(m, inp->inp_options, ro, 1154 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1155 inp->inp_moptions, inp->inp_socket)); 1156 1157 release: 1158 m_freem(m); 1159 return (error); 1160 } 1161 1162 int udp_sendspace = 9216; /* really max datagram size */ 1163 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1164 /* 40 1K datagrams */ 1165 1166 /*ARGSUSED*/ 1167 int 1168 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1169 struct mbuf *control, struct lwp *l) 1170 { 1171 struct inpcb *inp; 1172 int s; 1173 int error = 0; 1174 1175 if (req == PRU_CONTROL) 1176 return (in_control(so, (long)m, (void *)nam, 1177 (struct ifnet *)control, l)); 1178 1179 s = splsoftnet(); 1180 1181 if (req == PRU_PURGEIF) { 1182 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1183 in_purgeif((struct ifnet *)control); 1184 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1185 splx(s); 1186 return (0); 1187 } 1188 1189 inp = sotoinpcb(so); 1190 #ifdef DIAGNOSTIC 1191 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1192 panic("udp_usrreq: unexpected control mbuf"); 1193 #endif 1194 if (inp == 0 && req != PRU_ATTACH) { 1195 error = EINVAL; 1196 goto release; 1197 } 1198 1199 /* 1200 * Note: need to block udp_input while changing 1201 * the udp pcb queue and/or pcb addresses. 1202 */ 1203 switch (req) { 1204 1205 case PRU_ATTACH: 1206 if (inp != 0) { 1207 error = EISCONN; 1208 break; 1209 } 1210 #ifdef MBUFTRACE 1211 so->so_mowner = &udp_mowner; 1212 so->so_rcv.sb_mowner = &udp_rx_mowner; 1213 so->so_snd.sb_mowner = &udp_tx_mowner; 1214 #endif 1215 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1216 error = soreserve(so, udp_sendspace, udp_recvspace); 1217 if (error) 1218 break; 1219 } 1220 error = in_pcballoc(so, &udbtable); 1221 if (error) 1222 break; 1223 inp = sotoinpcb(so); 1224 inp->inp_ip.ip_ttl = ip_defttl; 1225 break; 1226 1227 case PRU_DETACH: 1228 in_pcbdetach(inp); 1229 break; 1230 1231 case PRU_BIND: 1232 error = in_pcbbind(inp, nam, l); 1233 break; 1234 1235 case PRU_LISTEN: 1236 error = EOPNOTSUPP; 1237 break; 1238 1239 case PRU_CONNECT: 1240 error = in_pcbconnect(inp, nam, l); 1241 if (error) 1242 break; 1243 soisconnected(so); 1244 break; 1245 1246 case PRU_CONNECT2: 1247 error = EOPNOTSUPP; 1248 break; 1249 1250 case PRU_DISCONNECT: 1251 /*soisdisconnected(so);*/ 1252 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1253 in_pcbdisconnect(inp); 1254 inp->inp_laddr = zeroin_addr; /* XXX */ 1255 in_pcbstate(inp, INP_BOUND); /* XXX */ 1256 break; 1257 1258 case PRU_SHUTDOWN: 1259 socantsendmore(so); 1260 break; 1261 1262 case PRU_RCVD: 1263 error = EOPNOTSUPP; 1264 break; 1265 1266 case PRU_SEND: 1267 if (control && control->m_len) { 1268 m_freem(control); 1269 m_freem(m); 1270 error = EINVAL; 1271 break; 1272 } 1273 { 1274 struct in_addr laddr; /* XXX */ 1275 1276 if (nam) { 1277 laddr = inp->inp_laddr; /* XXX */ 1278 if ((so->so_state & SS_ISCONNECTED) != 0) { 1279 error = EISCONN; 1280 goto die; 1281 } 1282 error = in_pcbconnect(inp, nam, l); 1283 if (error) 1284 goto die; 1285 } else { 1286 if ((so->so_state & SS_ISCONNECTED) == 0) { 1287 error = ENOTCONN; 1288 goto die; 1289 } 1290 } 1291 error = udp_output(m, inp); 1292 m = NULL; 1293 if (nam) { 1294 in_pcbdisconnect(inp); 1295 inp->inp_laddr = laddr; /* XXX */ 1296 in_pcbstate(inp, INP_BOUND); /* XXX */ 1297 } 1298 die: 1299 if (m) 1300 m_freem(m); 1301 } 1302 break; 1303 1304 case PRU_SENSE: 1305 /* 1306 * stat: don't bother with a blocksize. 1307 */ 1308 splx(s); 1309 return (0); 1310 1311 case PRU_RCVOOB: 1312 error = EOPNOTSUPP; 1313 break; 1314 1315 case PRU_SENDOOB: 1316 m_freem(control); 1317 m_freem(m); 1318 error = EOPNOTSUPP; 1319 break; 1320 1321 case PRU_SOCKADDR: 1322 in_setsockaddr(inp, nam); 1323 break; 1324 1325 case PRU_PEERADDR: 1326 in_setpeeraddr(inp, nam); 1327 break; 1328 1329 default: 1330 panic("udp_usrreq"); 1331 } 1332 1333 release: 1334 splx(s); 1335 return (error); 1336 } 1337 1338 static void 1339 udpstat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci) 1340 { 1341 uint64_t *udpsc = v1; 1342 uint64_t *udps = v2; 1343 u_int i; 1344 1345 for (i = 0; i < UDP_NSTATS; i++) 1346 udps[i] += udpsc[i]; 1347 } 1348 1349 static void 1350 udpstat_convert_to_user(uint64_t *udps) 1351 { 1352 1353 memset(udps, 0, sizeof(uint64_t) * UDP_NSTATS); 1354 percpu_foreach(udpstat_percpu, udpstat_convert_to_user_cb, udps); 1355 } 1356 1357 static int 1358 sysctl_net_inet_udp_stats(SYSCTLFN_ARGS) 1359 { 1360 struct sysctlnode node; 1361 uint64_t udps[UDP_NSTATS]; 1362 1363 udpstat_convert_to_user(udps); 1364 node = *rnode; 1365 node.sysctl_data = udps; 1366 node.sysctl_size = sizeof(udps); 1367 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 1368 } 1369 1370 /* 1371 * Sysctl for udp variables. 1372 */ 1373 SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") 1374 { 1375 1376 sysctl_createv(clog, 0, NULL, NULL, 1377 CTLFLAG_PERMANENT, 1378 CTLTYPE_NODE, "net", NULL, 1379 NULL, 0, NULL, 0, 1380 CTL_NET, CTL_EOL); 1381 sysctl_createv(clog, 0, NULL, NULL, 1382 CTLFLAG_PERMANENT, 1383 CTLTYPE_NODE, "inet", NULL, 1384 NULL, 0, NULL, 0, 1385 CTL_NET, PF_INET, CTL_EOL); 1386 sysctl_createv(clog, 0, NULL, NULL, 1387 CTLFLAG_PERMANENT, 1388 CTLTYPE_NODE, "udp", 1389 SYSCTL_DESCR("UDPv4 related settings"), 1390 NULL, 0, NULL, 0, 1391 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1392 1393 sysctl_createv(clog, 0, NULL, NULL, 1394 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1395 CTLTYPE_INT, "checksum", 1396 SYSCTL_DESCR("Compute UDP checksums"), 1397 NULL, 0, &udpcksum, 0, 1398 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1399 CTL_EOL); 1400 sysctl_createv(clog, 0, NULL, NULL, 1401 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1402 CTLTYPE_INT, "sendspace", 1403 SYSCTL_DESCR("Default UDP send buffer size"), 1404 NULL, 0, &udp_sendspace, 0, 1405 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1406 CTL_EOL); 1407 sysctl_createv(clog, 0, NULL, NULL, 1408 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1409 CTLTYPE_INT, "recvspace", 1410 SYSCTL_DESCR("Default UDP receive buffer size"), 1411 NULL, 0, &udp_recvspace, 0, 1412 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1413 CTL_EOL); 1414 sysctl_createv(clog, 0, NULL, NULL, 1415 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1416 CTLTYPE_INT, "do_loopback_cksum", 1417 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1418 NULL, 0, &udp_do_loopback_cksum, 0, 1419 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1420 CTL_EOL); 1421 sysctl_createv(clog, 0, NULL, NULL, 1422 CTLFLAG_PERMANENT, 1423 CTLTYPE_STRUCT, "pcblist", 1424 SYSCTL_DESCR("UDP protocol control block list"), 1425 sysctl_inpcblist, 0, &udbtable, 0, 1426 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1427 CTL_EOL); 1428 sysctl_createv(clog, 0, NULL, NULL, 1429 CTLFLAG_PERMANENT, 1430 CTLTYPE_STRUCT, "stats", 1431 SYSCTL_DESCR("UDP statistics"), 1432 sysctl_net_inet_udp_stats, 0, NULL, 0, 1433 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1434 CTL_EOL); 1435 } 1436 #endif 1437 1438 void 1439 udp_statinc(u_int stat) 1440 { 1441 1442 KASSERT(stat < UDP_NSTATS); 1443 UDP_STATINC(stat); 1444 } 1445 1446 #if (defined INET && defined IPSEC_NAT_T) 1447 /* 1448 * Returns: 1449 * 1 if the packet was processed 1450 * 0 if normal UDP processing should take place 1451 * -1 if an error occurent and m was freed 1452 */ 1453 static int 1454 udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src, 1455 struct socket *so) 1456 { 1457 size_t len; 1458 void *data; 1459 struct inpcb *inp; 1460 size_t skip = 0; 1461 size_t minlen; 1462 size_t iphdrlen; 1463 struct ip *ip; 1464 struct mbuf *n; 1465 struct m_tag *tag; 1466 struct udphdr *udphdr; 1467 u_int16_t sport, dport; 1468 struct mbuf *m = *mp; 1469 1470 /* 1471 * Collapse the mbuf chain if the first mbuf is too short 1472 * The longest case is: UDP + non ESP marker + ESP 1473 */ 1474 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1475 if (minlen > m->m_pkthdr.len) 1476 minlen = m->m_pkthdr.len; 1477 1478 if (m->m_len < minlen) { 1479 if ((*mp = m_pullup(m, minlen)) == NULL) { 1480 printf("udp4_espinudp: m_pullup failed\n"); 1481 return -1; 1482 } 1483 m = *mp; 1484 } 1485 1486 len = m->m_len - off; 1487 data = mtod(m, char *) + off; 1488 inp = sotoinpcb(so); 1489 1490 /* Ignore keepalive packets */ 1491 if ((len == 1) && (*(unsigned char *)data == 0xff)) { 1492 return 1; 1493 } 1494 1495 /* 1496 * Check that the payload is long enough to hold 1497 * an ESP header and compute the length of encapsulation 1498 * header to remove 1499 */ 1500 if (inp->inp_flags & INP_ESPINUDP) { 1501 u_int32_t *st = (u_int32_t *)data; 1502 1503 if ((len <= sizeof(struct esp)) || (*st == 0)) 1504 return 0; /* Normal UDP processing */ 1505 1506 skip = sizeof(struct udphdr); 1507 } 1508 1509 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1510 u_int32_t *st = (u_int32_t *)data; 1511 1512 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1513 || ((st[0] | st[1]) != 0)) 1514 return 0; /* Normal UDP processing */ 1515 1516 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1517 } 1518 1519 /* 1520 * Get the UDP ports. They are handled in network 1521 * order everywhere in IPSEC_NAT_T code. 1522 */ 1523 udphdr = (struct udphdr *)((char *)data - skip); 1524 sport = udphdr->uh_sport; 1525 dport = udphdr->uh_dport; 1526 1527 /* 1528 * Remove the UDP header (and possibly the non ESP marker) 1529 * IP header lendth is iphdrlen 1530 * Before: 1531 * <--- off ---> 1532 * +----+------+-----+ 1533 * | IP | UDP | ESP | 1534 * +----+------+-----+ 1535 * <-skip-> 1536 * After: 1537 * +----+-----+ 1538 * | IP | ESP | 1539 * +----+-----+ 1540 * <-skip-> 1541 */ 1542 iphdrlen = off - sizeof(struct udphdr); 1543 memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen); 1544 m_adj(m, skip); 1545 1546 ip = mtod(m, struct ip *); 1547 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1548 ip->ip_p = IPPROTO_ESP; 1549 1550 /* 1551 * Copy the mbuf to avoid multiple free, as both 1552 * esp4_input (which we call) and udp_input (which 1553 * called us) free the mbuf. 1554 */ 1555 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1556 printf("udp4_espinudp: m_dup failed\n"); 1557 return 0; 1558 } 1559 1560 /* 1561 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1562 * the source UDP port. This is required if we want 1563 * to select the right SPD for multiple hosts behind 1564 * same NAT 1565 */ 1566 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1567 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1568 printf("udp4_espinudp: m_tag_get failed\n"); 1569 m_freem(n); 1570 return 0; 1571 } 1572 ((u_int16_t *)(tag + 1))[0] = sport; 1573 ((u_int16_t *)(tag + 1))[1] = dport; 1574 m_tag_prepend(n, tag); 1575 1576 #ifdef FAST_IPSEC 1577 ipsec4_common_input(n, iphdrlen, IPPROTO_ESP); 1578 #else 1579 esp4_input(n, iphdrlen); 1580 #endif 1581 1582 /* We handled it, it shoudln't be handled by UDP */ 1583 return 1; 1584 } 1585 #endif 1586