udp_usrreq.c revision 1.191
1 /* $NetBSD: udp_usrreq.c,v 1.191 2013/11/23 14:20:21 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 1.191 2013/11/23 14:20:21 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 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 /* 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 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 if (m == NULL) { 408 /* 409 * packet has been processed by ESP stuff - 410 * e.g. dropped NAT-T-keep-alive-packet ... 411 */ 412 return; 413 } 414 ip = mtod(m, struct ip *); 415 #ifdef INET6 416 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 417 struct sockaddr_in6 src6, dst6; 418 419 memset(&src6, 0, sizeof(src6)); 420 src6.sin6_family = AF_INET6; 421 src6.sin6_len = sizeof(struct sockaddr_in6); 422 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 423 memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src, 424 sizeof(ip->ip_src)); 425 src6.sin6_port = uh->uh_sport; 426 memset(&dst6, 0, sizeof(dst6)); 427 dst6.sin6_family = AF_INET6; 428 dst6.sin6_len = sizeof(struct sockaddr_in6); 429 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 430 memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst, 431 sizeof(ip->ip_dst)); 432 dst6.sin6_port = uh->uh_dport; 433 434 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 435 } 436 #endif 437 438 if (n == 0) { 439 if (m->m_flags & (M_BCAST | M_MCAST)) { 440 UDP_STATINC(UDP_STAT_NOPORTBCAST); 441 goto bad; 442 } 443 UDP_STATINC(UDP_STAT_NOPORT); 444 #ifdef IPKDB 445 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 446 m, iphlen + sizeof(struct udphdr), 447 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 448 /* 449 * It was a debugger connect packet, 450 * just drop it now 451 */ 452 goto bad; 453 } 454 #endif 455 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 456 m = NULL; 457 } 458 459 bad: 460 if (m) 461 m_freem(m); 462 return; 463 464 badcsum: 465 m_freem(m); 466 } 467 #endif 468 469 #ifdef INET6 470 static int 471 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 472 { 473 474 /* 475 * XXX it's better to record and check if this mbuf is 476 * already checked. 477 */ 478 479 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 480 goto good; 481 } 482 if (uh->uh_sum == 0) { 483 UDP6_STATINC(UDP6_STAT_NOSUM); 484 goto bad; 485 } 486 487 switch (m->m_pkthdr.csum_flags & 488 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 489 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 490 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 491 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 492 UDP6_STATINC(UDP6_STAT_BADSUM); 493 goto bad; 494 495 #if 0 /* notyet */ 496 case M_CSUM_UDPv6|M_CSUM_DATA: 497 #endif 498 499 case M_CSUM_UDPv6: 500 /* Checksum was okay. */ 501 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 502 break; 503 504 default: 505 /* 506 * Need to compute it ourselves. Maybe skip checksum 507 * on loopback interfaces. 508 */ 509 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 510 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 511 UDP6_STATINC(UDP6_STAT_BADSUM); 512 goto bad; 513 } 514 } 515 516 good: 517 return 0; 518 bad: 519 return -1; 520 } 521 522 int 523 udp6_input(struct mbuf **mp, int *offp, int proto) 524 { 525 struct mbuf *m = *mp; 526 int off = *offp; 527 struct sockaddr_in6 src, dst; 528 struct ip6_hdr *ip6; 529 struct udphdr *uh; 530 u_int32_t plen, ulen; 531 532 ip6 = mtod(m, struct ip6_hdr *); 533 534 #if defined(NFAITH) && 0 < NFAITH 535 if (faithprefix(&ip6->ip6_dst)) { 536 /* send icmp6 host unreach? */ 537 m_freem(m); 538 return IPPROTO_DONE; 539 } 540 #endif 541 542 UDP6_STATINC(UDP6_STAT_IPACKETS); 543 544 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 545 plen = m->m_pkthdr.len - off; 546 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 547 if (uh == NULL) { 548 IP6_STATINC(IP6_STAT_TOOSHORT); 549 return IPPROTO_DONE; 550 } 551 KASSERT(UDP_HDR_ALIGNED_P(uh)); 552 ulen = ntohs((u_short)uh->uh_ulen); 553 /* 554 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 555 * iff payload length > 0xffff. 556 */ 557 if (ulen == 0 && plen > 0xffff) 558 ulen = plen; 559 560 if (plen != ulen) { 561 UDP6_STATINC(UDP6_STAT_BADLEN); 562 goto bad; 563 } 564 565 /* destination port of 0 is illegal, based on RFC768. */ 566 if (uh->uh_dport == 0) 567 goto bad; 568 569 /* Be proactive about malicious use of IPv4 mapped address */ 570 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 571 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 572 /* XXX stat */ 573 goto bad; 574 } 575 576 /* 577 * Checksum extended UDP header and data. Maybe skip checksum 578 * on loopback interfaces. 579 */ 580 if (udp6_input_checksum(m, uh, off, ulen)) 581 goto bad; 582 583 /* 584 * Construct source and dst sockaddrs. 585 */ 586 memset(&src, 0, sizeof(src)); 587 src.sin6_family = AF_INET6; 588 src.sin6_len = sizeof(struct sockaddr_in6); 589 src.sin6_addr = ip6->ip6_src; 590 src.sin6_port = uh->uh_sport; 591 memset(&dst, 0, sizeof(dst)); 592 dst.sin6_family = AF_INET6; 593 dst.sin6_len = sizeof(struct sockaddr_in6); 594 dst.sin6_addr = ip6->ip6_dst; 595 dst.sin6_port = uh->uh_dport; 596 597 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 598 if (m->m_flags & M_MCAST) { 599 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 600 goto bad; 601 } 602 UDP6_STATINC(UDP6_STAT_NOPORT); 603 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 604 m = NULL; 605 } 606 607 bad: 608 if (m) 609 m_freem(m); 610 return IPPROTO_DONE; 611 } 612 #endif 613 614 #ifdef INET 615 static void 616 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 617 struct sockaddr *src, struct socket *so) 618 { 619 struct mbuf *opts = NULL; 620 struct mbuf *n; 621 struct inpcb *inp = NULL; 622 623 if (!so) 624 return; 625 switch (so->so_proto->pr_domain->dom_family) { 626 case AF_INET: 627 inp = sotoinpcb(so); 628 break; 629 #ifdef INET6 630 case AF_INET6: 631 break; 632 #endif 633 default: 634 return; 635 } 636 637 #if defined(IPSEC) 638 /* check AH/ESP integrity. */ 639 if (so != NULL && ipsec4_in_reject_so(m, so)) { 640 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 641 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 642 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 643 0, 0); 644 return; 645 } 646 #endif /*IPSEC*/ 647 648 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 649 if (inp && (inp->inp_flags & INP_CONTROLOPTS 650 #ifdef SO_OTIMESTAMP 651 || so->so_options & SO_OTIMESTAMP 652 #endif 653 || so->so_options & SO_TIMESTAMP)) { 654 struct ip *ip = mtod(n, struct ip *); 655 ip_savecontrol(inp, &opts, ip, n); 656 } 657 658 m_adj(n, off); 659 if (sbappendaddr(&so->so_rcv, src, n, 660 opts) == 0) { 661 m_freem(n); 662 if (opts) 663 m_freem(opts); 664 so->so_rcv.sb_overflowed++; 665 UDP_STATINC(UDP_STAT_FULLSOCK); 666 } else 667 sorwakeup(so); 668 } 669 } 670 #endif 671 672 #ifdef INET6 673 static void 674 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 675 struct sockaddr *src, struct socket *so) 676 { 677 struct mbuf *opts = NULL; 678 struct mbuf *n; 679 struct in6pcb *in6p = NULL; 680 681 if (!so) 682 return; 683 if (so->so_proto->pr_domain->dom_family != AF_INET6) 684 return; 685 in6p = sotoin6pcb(so); 686 687 #if defined(IPSEC) 688 /* check AH/ESP integrity. */ 689 if (so != NULL && ipsec6_in_reject_so(m, so)) { 690 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 691 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 692 icmp6_error(n, ICMP6_DST_UNREACH, 693 ICMP6_DST_UNREACH_ADMIN, 0); 694 return; 695 } 696 #endif /*IPSEC*/ 697 698 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 699 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 700 #ifdef SO_OTIMESTAMP 701 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 702 #endif 703 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 704 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 705 ip6_savecontrol(in6p, &opts, ip6, n); 706 } 707 708 m_adj(n, off); 709 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 710 m_freem(n); 711 if (opts) 712 m_freem(opts); 713 so->so_rcv.sb_overflowed++; 714 UDP6_STATINC(UDP6_STAT_FULLSOCK); 715 } else 716 sorwakeup(so); 717 } 718 } 719 #endif 720 721 #ifdef INET 722 static int 723 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 724 struct mbuf **mp, int off /* offset of udphdr */) 725 { 726 u_int16_t *sport, *dport; 727 int rcvcnt; 728 struct in_addr *src4, *dst4; 729 struct inpcb_hdr *inph; 730 struct inpcb *inp; 731 struct mbuf *m = *mp; 732 733 rcvcnt = 0; 734 off += sizeof(struct udphdr); /* now, offset of payload */ 735 736 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 737 goto bad; 738 739 src4 = &src->sin_addr; 740 sport = &src->sin_port; 741 dst4 = &dst->sin_addr; 742 dport = &dst->sin_port; 743 744 if (IN_MULTICAST(dst4->s_addr) || 745 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 746 /* 747 * Deliver a multicast or broadcast datagram to *all* sockets 748 * for which the local and remote addresses and ports match 749 * those of the incoming datagram. This allows more than 750 * one process to receive multi/broadcasts on the same port. 751 * (This really ought to be done for unicast datagrams as 752 * well, but that would cause problems with existing 753 * applications that open both address-specific sockets and 754 * a wildcard socket listening to the same port -- they would 755 * end up receiving duplicates of every unicast datagram. 756 * Those applications open the multiple sockets to overcome an 757 * inadequacy of the UDP socket interface, but for backwards 758 * compatibility we avoid the problem here rather than 759 * fixing the interface. Maybe 4.5BSD will remedy this?) 760 */ 761 762 /* 763 * KAME note: traditionally we dropped udpiphdr from mbuf here. 764 * we need udpiphdr for IPsec processing so we do that later. 765 */ 766 /* 767 * Locate pcb(s) for datagram. 768 */ 769 TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 770 inp = (struct inpcb *)inph; 771 if (inp->inp_af != AF_INET) 772 continue; 773 774 if (inp->inp_lport != *dport) 775 continue; 776 if (!in_nullhost(inp->inp_laddr)) { 777 if (!in_hosteq(inp->inp_laddr, *dst4)) 778 continue; 779 } 780 if (!in_nullhost(inp->inp_faddr)) { 781 if (!in_hosteq(inp->inp_faddr, *src4) || 782 inp->inp_fport != *sport) 783 continue; 784 } 785 786 udp4_sendup(m, off, (struct sockaddr *)src, 787 inp->inp_socket); 788 rcvcnt++; 789 790 /* 791 * Don't look for additional matches if this one does 792 * not have either the SO_REUSEPORT or SO_REUSEADDR 793 * socket options set. This heuristic avoids searching 794 * through all pcbs in the common case of a non-shared 795 * port. It assumes that an application will never 796 * clear these options after setting them. 797 */ 798 if ((inp->inp_socket->so_options & 799 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 800 break; 801 } 802 } else { 803 /* 804 * Locate pcb for datagram. 805 */ 806 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, 807 *dport, 0); 808 if (inp == 0) { 809 UDP_STATINC(UDP_STAT_PCBHASHMISS); 810 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 811 if (inp == 0) 812 return rcvcnt; 813 } 814 815 #ifdef IPSEC 816 /* Handle ESP over UDP */ 817 if (inp->inp_flags & INP_ESPINUDP_ALL) { 818 struct sockaddr *sa = (struct sockaddr *)src; 819 820 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 821 case -1: /* Error, m was freeed */ 822 rcvcnt = -1; 823 goto bad; 824 break; 825 826 case 1: /* ESP over UDP */ 827 rcvcnt++; 828 goto bad; 829 break; 830 831 case 0: /* plain UDP */ 832 default: /* Unexpected */ 833 /* 834 * Normal UDP processing will take place 835 * m may have changed. 836 */ 837 m = *mp; 838 break; 839 } 840 } 841 #endif 842 843 /* 844 * Check the minimum TTL for socket. 845 */ 846 if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl) 847 goto bad; 848 849 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 850 rcvcnt++; 851 } 852 853 bad: 854 return rcvcnt; 855 } 856 #endif 857 858 #ifdef INET6 859 static int 860 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 861 struct mbuf *m, int off) 862 { 863 u_int16_t sport, dport; 864 int rcvcnt; 865 struct in6_addr src6, *dst6; 866 const struct in_addr *dst4; 867 struct inpcb_hdr *inph; 868 struct in6pcb *in6p; 869 870 rcvcnt = 0; 871 off += sizeof(struct udphdr); /* now, offset of payload */ 872 873 if (af != AF_INET && af != AF_INET6) 874 goto bad; 875 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 876 goto bad; 877 878 src6 = src->sin6_addr; 879 if (sa6_recoverscope(src) != 0) { 880 /* XXX: should be impossible. */ 881 goto bad; 882 } 883 sport = src->sin6_port; 884 885 dport = dst->sin6_port; 886 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 887 dst6 = &dst->sin6_addr; 888 889 if (IN6_IS_ADDR_MULTICAST(dst6) || 890 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 891 /* 892 * Deliver a multicast or broadcast datagram to *all* sockets 893 * for which the local and remote addresses and ports match 894 * those of the incoming datagram. This allows more than 895 * one process to receive multi/broadcasts on the same port. 896 * (This really ought to be done for unicast datagrams as 897 * well, but that would cause problems with existing 898 * applications that open both address-specific sockets and 899 * a wildcard socket listening to the same port -- they would 900 * end up receiving duplicates of every unicast datagram. 901 * Those applications open the multiple sockets to overcome an 902 * inadequacy of the UDP socket interface, but for backwards 903 * compatibility we avoid the problem here rather than 904 * fixing the interface. Maybe 4.5BSD will remedy this?) 905 */ 906 907 /* 908 * KAME note: traditionally we dropped udpiphdr from mbuf here. 909 * we need udpiphdr for IPsec processing so we do that later. 910 */ 911 /* 912 * Locate pcb(s) for datagram. 913 */ 914 TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 915 in6p = (struct in6pcb *)inph; 916 if (in6p->in6p_af != AF_INET6) 917 continue; 918 919 if (in6p->in6p_lport != dport) 920 continue; 921 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 922 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 923 dst6)) 924 continue; 925 } else { 926 if (IN6_IS_ADDR_V4MAPPED(dst6) && 927 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 928 continue; 929 } 930 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 931 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 932 &src6) || in6p->in6p_fport != sport) 933 continue; 934 } else { 935 if (IN6_IS_ADDR_V4MAPPED(&src6) && 936 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 937 continue; 938 } 939 940 udp6_sendup(m, off, (struct sockaddr *)src, 941 in6p->in6p_socket); 942 rcvcnt++; 943 944 /* 945 * Don't look for additional matches if this one does 946 * not have either the SO_REUSEPORT or SO_REUSEADDR 947 * socket options set. This heuristic avoids searching 948 * through all pcbs in the common case of a non-shared 949 * port. It assumes that an application will never 950 * clear these options after setting them. 951 */ 952 if ((in6p->in6p_socket->so_options & 953 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 954 break; 955 } 956 } else { 957 /* 958 * Locate pcb for datagram. 959 */ 960 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 961 dport, 0, 0); 962 if (in6p == 0) { 963 UDP_STATINC(UDP_STAT_PCBHASHMISS); 964 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 965 if (in6p == 0) 966 return rcvcnt; 967 } 968 969 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 970 rcvcnt++; 971 } 972 973 bad: 974 return rcvcnt; 975 } 976 #endif 977 978 #ifdef INET 979 /* 980 * Notify a udp user of an asynchronous error; 981 * just wake up so that he can collect error status. 982 */ 983 static void 984 udp_notify(struct inpcb *inp, int errno) 985 { 986 inp->inp_socket->so_error = errno; 987 sorwakeup(inp->inp_socket); 988 sowwakeup(inp->inp_socket); 989 } 990 991 void * 992 udp_ctlinput(int cmd, const struct sockaddr *sa, void *v) 993 { 994 struct ip *ip = v; 995 struct udphdr *uh; 996 void (*notify)(struct inpcb *, int) = udp_notify; 997 int errno; 998 999 if (sa->sa_family != AF_INET 1000 || sa->sa_len != sizeof(struct sockaddr_in)) 1001 return NULL; 1002 if ((unsigned)cmd >= PRC_NCMDS) 1003 return NULL; 1004 errno = inetctlerrmap[cmd]; 1005 if (PRC_IS_REDIRECT(cmd)) 1006 notify = in_rtchange, ip = 0; 1007 else if (cmd == PRC_HOSTDEAD) 1008 ip = 0; 1009 else if (errno == 0) 1010 return NULL; 1011 if (ip) { 1012 uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2)); 1013 in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport, 1014 ip->ip_src, uh->uh_sport, errno, notify); 1015 1016 /* XXX mapped address case */ 1017 } else 1018 in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno, 1019 notify); 1020 return NULL; 1021 } 1022 1023 int 1024 udp_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1025 { 1026 int s; 1027 int error = 0; 1028 struct inpcb *inp; 1029 int family; 1030 int optval; 1031 1032 family = so->so_proto->pr_domain->dom_family; 1033 1034 s = splsoftnet(); 1035 switch (family) { 1036 #ifdef INET 1037 case PF_INET: 1038 if (sopt->sopt_level != IPPROTO_UDP) { 1039 error = ip_ctloutput(op, so, sopt); 1040 goto end; 1041 } 1042 break; 1043 #endif 1044 #ifdef INET6 1045 case PF_INET6: 1046 if (sopt->sopt_level != IPPROTO_UDP) { 1047 error = ip6_ctloutput(op, so, sopt); 1048 goto end; 1049 } 1050 break; 1051 #endif 1052 default: 1053 error = EAFNOSUPPORT; 1054 goto end; 1055 } 1056 1057 1058 switch (op) { 1059 case PRCO_SETOPT: 1060 inp = sotoinpcb(so); 1061 1062 switch (sopt->sopt_name) { 1063 case UDP_ENCAP: 1064 error = sockopt_getint(sopt, &optval); 1065 if (error) 1066 break; 1067 1068 switch(optval) { 1069 case 0: 1070 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1071 break; 1072 1073 case UDP_ENCAP_ESPINUDP: 1074 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1075 inp->inp_flags |= INP_ESPINUDP; 1076 break; 1077 1078 case UDP_ENCAP_ESPINUDP_NON_IKE: 1079 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1080 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1081 break; 1082 default: 1083 error = EINVAL; 1084 break; 1085 } 1086 break; 1087 1088 default: 1089 error = ENOPROTOOPT; 1090 break; 1091 } 1092 break; 1093 1094 default: 1095 error = EINVAL; 1096 break; 1097 } 1098 1099 end: 1100 splx(s); 1101 return error; 1102 } 1103 1104 1105 int 1106 udp_output(struct mbuf *m, ...) 1107 { 1108 struct inpcb *inp; 1109 struct udpiphdr *ui; 1110 struct route *ro; 1111 int len = m->m_pkthdr.len; 1112 int error = 0; 1113 va_list ap; 1114 1115 MCLAIM(m, &udp_tx_mowner); 1116 va_start(ap, m); 1117 inp = va_arg(ap, struct inpcb *); 1118 va_end(ap); 1119 1120 /* 1121 * Calculate data length and get a mbuf 1122 * for UDP and IP headers. 1123 */ 1124 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1125 if (m == 0) { 1126 error = ENOBUFS; 1127 goto release; 1128 } 1129 1130 /* 1131 * Compute the packet length of the IP header, and 1132 * punt if the length looks bogus. 1133 */ 1134 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1135 error = EMSGSIZE; 1136 goto release; 1137 } 1138 1139 /* 1140 * Fill in mbuf with extended UDP header 1141 * and addresses and length put into network format. 1142 */ 1143 ui = mtod(m, struct udpiphdr *); 1144 ui->ui_pr = IPPROTO_UDP; 1145 ui->ui_src = inp->inp_laddr; 1146 ui->ui_dst = inp->inp_faddr; 1147 ui->ui_sport = inp->inp_lport; 1148 ui->ui_dport = inp->inp_fport; 1149 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1150 1151 ro = &inp->inp_route; 1152 1153 /* 1154 * Set up checksum and output datagram. 1155 */ 1156 if (udpcksum) { 1157 /* 1158 * XXX Cache pseudo-header checksum part for 1159 * XXX "connected" UDP sockets. 1160 */ 1161 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1162 ui->ui_dst.s_addr, htons((u_int16_t)len + 1163 sizeof(struct udphdr) + IPPROTO_UDP)); 1164 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1165 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1166 } else 1167 ui->ui_sum = 0; 1168 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1169 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1170 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1171 UDP_STATINC(UDP_STAT_OPACKETS); 1172 1173 return (ip_output(m, inp->inp_options, ro, 1174 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1175 inp->inp_moptions, inp->inp_socket)); 1176 1177 release: 1178 m_freem(m); 1179 return (error); 1180 } 1181 1182 int udp_sendspace = 9216; /* really max datagram size */ 1183 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1184 /* 40 1K datagrams */ 1185 1186 /*ARGSUSED*/ 1187 int 1188 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1189 struct mbuf *control, struct lwp *l) 1190 { 1191 struct inpcb *inp; 1192 int s; 1193 int error = 0; 1194 1195 if (req == PRU_CONTROL) 1196 return (in_control(so, (long)m, (void *)nam, 1197 (struct ifnet *)control, l)); 1198 1199 s = splsoftnet(); 1200 1201 if (req == PRU_PURGEIF) { 1202 mutex_enter(softnet_lock); 1203 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1204 in_purgeif((struct ifnet *)control); 1205 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1206 mutex_exit(softnet_lock); 1207 splx(s); 1208 return (0); 1209 } 1210 1211 inp = sotoinpcb(so); 1212 #ifdef DIAGNOSTIC 1213 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1214 panic("udp_usrreq: unexpected control mbuf"); 1215 #endif 1216 if (req == PRU_ATTACH) { 1217 sosetlock(so); 1218 } else if (inp == 0) { 1219 error = EINVAL; 1220 goto release; 1221 } 1222 1223 /* 1224 * Note: need to block udp_input while changing 1225 * the udp pcb queue and/or pcb addresses. 1226 */ 1227 switch (req) { 1228 1229 case PRU_ATTACH: 1230 if (inp != 0) { 1231 error = EISCONN; 1232 break; 1233 } 1234 #ifdef MBUFTRACE 1235 so->so_mowner = &udp_mowner; 1236 so->so_rcv.sb_mowner = &udp_rx_mowner; 1237 so->so_snd.sb_mowner = &udp_tx_mowner; 1238 #endif 1239 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1240 error = soreserve(so, udp_sendspace, udp_recvspace); 1241 if (error) 1242 break; 1243 } 1244 error = in_pcballoc(so, &udbtable); 1245 if (error) 1246 break; 1247 inp = sotoinpcb(so); 1248 inp->inp_ip.ip_ttl = ip_defttl; 1249 break; 1250 1251 case PRU_DETACH: 1252 in_pcbdetach(inp); 1253 break; 1254 1255 case PRU_BIND: 1256 error = in_pcbbind(inp, nam, l); 1257 break; 1258 1259 case PRU_LISTEN: 1260 error = EOPNOTSUPP; 1261 break; 1262 1263 case PRU_CONNECT: 1264 error = in_pcbconnect(inp, nam, l); 1265 if (error) 1266 break; 1267 soisconnected(so); 1268 break; 1269 1270 case PRU_CONNECT2: 1271 error = EOPNOTSUPP; 1272 break; 1273 1274 case PRU_DISCONNECT: 1275 /*soisdisconnected(so);*/ 1276 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1277 in_pcbdisconnect(inp); 1278 inp->inp_laddr = zeroin_addr; /* XXX */ 1279 in_pcbstate(inp, INP_BOUND); /* XXX */ 1280 break; 1281 1282 case PRU_SHUTDOWN: 1283 socantsendmore(so); 1284 break; 1285 1286 case PRU_RCVD: 1287 error = EOPNOTSUPP; 1288 break; 1289 1290 case PRU_SEND: 1291 if (control && control->m_len) { 1292 m_freem(control); 1293 m_freem(m); 1294 error = EINVAL; 1295 break; 1296 } 1297 { 1298 struct in_addr laddr; /* XXX */ 1299 1300 memset(&laddr, 0, sizeof laddr); 1301 if (nam) { 1302 laddr = inp->inp_laddr; /* XXX */ 1303 if ((so->so_state & SS_ISCONNECTED) != 0) { 1304 error = EISCONN; 1305 goto die; 1306 } 1307 error = in_pcbconnect(inp, nam, l); 1308 if (error) 1309 goto die; 1310 } else { 1311 if ((so->so_state & SS_ISCONNECTED) == 0) { 1312 error = ENOTCONN; 1313 goto die; 1314 } 1315 } 1316 error = udp_output(m, inp); 1317 m = NULL; 1318 if (nam) { 1319 in_pcbdisconnect(inp); 1320 inp->inp_laddr = laddr; /* XXX */ 1321 in_pcbstate(inp, INP_BOUND); /* XXX */ 1322 } 1323 die: 1324 if (m) 1325 m_freem(m); 1326 } 1327 break; 1328 1329 case PRU_SENSE: 1330 /* 1331 * stat: don't bother with a blocksize. 1332 */ 1333 splx(s); 1334 return (0); 1335 1336 case PRU_RCVOOB: 1337 error = EOPNOTSUPP; 1338 break; 1339 1340 case PRU_SENDOOB: 1341 m_freem(control); 1342 m_freem(m); 1343 error = EOPNOTSUPP; 1344 break; 1345 1346 case PRU_SOCKADDR: 1347 in_setsockaddr(inp, nam); 1348 break; 1349 1350 case PRU_PEERADDR: 1351 in_setpeeraddr(inp, nam); 1352 break; 1353 1354 default: 1355 panic("udp_usrreq"); 1356 } 1357 1358 release: 1359 splx(s); 1360 return (error); 1361 } 1362 1363 static int 1364 sysctl_net_inet_udp_stats(SYSCTLFN_ARGS) 1365 { 1366 1367 return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS)); 1368 } 1369 1370 /* 1371 * Sysctl for udp variables. 1372 */ 1373 static void 1374 sysctl_net_inet_udp_setup(struct sysctllog **clog) 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) 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 m_tag *tag; 1465 struct udphdr *udphdr; 1466 u_int16_t sport, dport; 1467 struct mbuf *m = *mp; 1468 1469 /* 1470 * Collapse the mbuf chain if the first mbuf is too short 1471 * The longest case is: UDP + non ESP marker + ESP 1472 */ 1473 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1474 if (minlen > m->m_pkthdr.len) 1475 minlen = m->m_pkthdr.len; 1476 1477 if (m->m_len < minlen) { 1478 if ((*mp = m_pullup(m, minlen)) == NULL) { 1479 printf("udp4_espinudp: m_pullup failed\n"); 1480 return -1; 1481 } 1482 m = *mp; 1483 } 1484 1485 len = m->m_len - off; 1486 data = mtod(m, char *) + off; 1487 inp = sotoinpcb(so); 1488 1489 /* Ignore keepalive packets */ 1490 if ((len == 1) && (*(unsigned char *)data == 0xff)) { 1491 m_free(m); 1492 *mp = NULL; /* avoid any further processiong by caller ... */ 1493 return 1; 1494 } 1495 1496 /* 1497 * Check that the payload is long enough to hold 1498 * an ESP header and compute the length of encapsulation 1499 * header to remove 1500 */ 1501 if (inp->inp_flags & INP_ESPINUDP) { 1502 u_int32_t *st = (u_int32_t *)data; 1503 1504 if ((len <= sizeof(struct esp)) || (*st == 0)) 1505 return 0; /* Normal UDP processing */ 1506 1507 skip = sizeof(struct udphdr); 1508 } 1509 1510 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1511 u_int32_t *st = (u_int32_t *)data; 1512 1513 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1514 || ((st[0] | st[1]) != 0)) 1515 return 0; /* Normal UDP processing */ 1516 1517 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1518 } 1519 1520 /* 1521 * Get the UDP ports. They are handled in network 1522 * order everywhere in IPSEC_NAT_T code. 1523 */ 1524 udphdr = (struct udphdr *)((char *)data - skip); 1525 sport = udphdr->uh_sport; 1526 dport = udphdr->uh_dport; 1527 1528 /* 1529 * Remove the UDP header (and possibly the non ESP marker) 1530 * IP header lendth is iphdrlen 1531 * Before: 1532 * <--- off ---> 1533 * +----+------+-----+ 1534 * | IP | UDP | ESP | 1535 * +----+------+-----+ 1536 * <-skip-> 1537 * After: 1538 * +----+-----+ 1539 * | IP | ESP | 1540 * +----+-----+ 1541 * <-skip-> 1542 */ 1543 iphdrlen = off - sizeof(struct udphdr); 1544 memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen); 1545 m_adj(m, skip); 1546 1547 ip = mtod(m, struct ip *); 1548 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1549 ip->ip_p = IPPROTO_ESP; 1550 1551 /* 1552 * We have modified the packet - it is now ESP, so we should not 1553 * return to UDP processing ... 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(m); 1564 return -1; 1565 } 1566 ((u_int16_t *)(tag + 1))[0] = sport; 1567 ((u_int16_t *)(tag + 1))[1] = dport; 1568 m_tag_prepend(m, tag); 1569 1570 #ifdef IPSEC 1571 ipsec4_common_input(m, iphdrlen, IPPROTO_ESP); 1572 #else 1573 esp4_input(m, iphdrlen); 1574 #endif 1575 1576 /* We handled it, it shouldn't be handled by UDP */ 1577 *mp = NULL; /* avoid free by caller ... */ 1578 return 1; 1579 } 1580 #endif 1581
Indexes created Mon Sep 22 13:09:51 GMT 2025