udp_usrreq.c revision 1.183.2.1
1 /* $NetBSD: udp_usrreq.c,v 1.183.2.1 2012/04/17 00:08:41 yamt 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 1.183.2.1 2012/04/17 00:08:41 yamt 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 #include <netinet/rfc6056.h> 100 101 #ifdef INET6 102 #include <netinet/ip6.h> 103 #include <netinet/icmp6.h> 104 #include <netinet6/ip6_var.h> 105 #include <netinet6/ip6_private.h> 106 #include <netinet6/in6_pcb.h> 107 #include <netinet6/udp6_var.h> 108 #include <netinet6/udp6_private.h> 109 #include <netinet6/scope6_var.h> 110 #endif 111 112 #ifndef INET6 113 /* always need ip6.h for IP6_EXTHDR_GET */ 114 #include <netinet/ip6.h> 115 #endif 116 117 #include "faith.h" 118 #if defined(NFAITH) && NFAITH > 0 119 #include <net/if_faith.h> 120 #endif 121 122 #ifdef FAST_IPSEC 123 #include <netipsec/ipsec.h> 124 #include <netipsec/ipsec_var.h> 125 #include <netipsec/ipsec_private.h> 126 #include <netipsec/esp.h> 127 #ifdef INET6 128 #include <netipsec/ipsec6.h> 129 #endif 130 #endif /* FAST_IPSEC */ 131 132 #ifdef COMPAT_50 133 #include <compat/sys/socket.h> 134 #endif 135 136 #ifdef IPKDB 137 #include <ipkdb/ipkdb.h> 138 #endif 139 140 /* 141 * UDP protocol implementation. 142 * Per RFC 768, August, 1980. 143 */ 144 int udpcksum = 1; 145 int udp_do_loopback_cksum = 0; 146 147 struct inpcbtable udbtable; 148 149 percpu_t *udpstat_percpu; 150 151 #ifdef INET 152 #ifdef IPSEC_NAT_T 153 static int udp4_espinudp (struct mbuf **, int, struct sockaddr *, 154 struct socket *); 155 #endif 156 static void udp4_sendup (struct mbuf *, int, struct sockaddr *, 157 struct socket *); 158 static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, 159 struct mbuf **, int); 160 static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); 161 #endif 162 #ifdef INET6 163 static void udp6_sendup (struct mbuf *, int, struct sockaddr *, 164 struct socket *); 165 static int udp6_realinput (int, struct sockaddr_in6 *, 166 struct sockaddr_in6 *, struct mbuf *, int); 167 static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int); 168 #endif 169 #ifdef INET 170 static void udp_notify (struct inpcb *, int); 171 #endif 172 173 #ifndef UDBHASHSIZE 174 #define UDBHASHSIZE 128 175 #endif 176 int udbhashsize = UDBHASHSIZE; 177 178 #ifdef MBUFTRACE 179 struct mowner udp_mowner = MOWNER_INIT("udp", ""); 180 struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx"); 181 struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx"); 182 #endif 183 184 #ifdef UDP_CSUM_COUNTERS 185 #include <sys/device.h> 186 187 #if defined(INET) 188 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 189 NULL, "udp", "hwcsum bad"); 190 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 191 NULL, "udp", "hwcsum ok"); 192 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 193 NULL, "udp", "hwcsum data"); 194 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 195 NULL, "udp", "swcsum"); 196 197 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 198 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 199 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 200 EVCNT_ATTACH_STATIC(udp_swcsum); 201 #endif /* defined(INET) */ 202 203 #if defined(INET6) 204 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 205 NULL, "udp6", "hwcsum bad"); 206 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 207 NULL, "udp6", "hwcsum ok"); 208 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 209 NULL, "udp6", "hwcsum data"); 210 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 211 NULL, "udp6", "swcsum"); 212 213 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 214 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 215 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 216 EVCNT_ATTACH_STATIC(udp6_swcsum); 217 #endif /* defined(INET6) */ 218 219 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 220 221 #else 222 223 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 224 225 #endif /* UDP_CSUM_COUNTERS */ 226 227 static void sysctl_net_inet_udp_setup(struct sysctllog **); 228 229 void 230 udp_init(void) 231 { 232 233 sysctl_net_inet_udp_setup(NULL); 234 235 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 236 237 MOWNER_ATTACH(&udp_tx_mowner); 238 MOWNER_ATTACH(&udp_rx_mowner); 239 MOWNER_ATTACH(&udp_mowner); 240 241 #ifdef INET 242 udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS); 243 #endif 244 #ifdef INET6 245 udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS); 246 #endif 247 } 248 249 /* 250 * Checksum extended UDP header and data. 251 */ 252 253 int 254 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 255 int iphlen, int len) 256 { 257 258 switch (af) { 259 #ifdef INET 260 case AF_INET: 261 return udp4_input_checksum(m, uh, iphlen, len); 262 #endif 263 #ifdef INET6 264 case AF_INET6: 265 return udp6_input_checksum(m, uh, iphlen, len); 266 #endif 267 } 268 #ifdef DIAGNOSTIC 269 panic("udp_input_checksum: unknown af %d", af); 270 #endif 271 /* NOTREACHED */ 272 return -1; 273 } 274 275 #ifdef INET 276 277 /* 278 * Checksum extended UDP header and data. 279 */ 280 281 static int 282 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 283 int iphlen, int len) 284 { 285 286 /* 287 * XXX it's better to record and check if this mbuf is 288 * already checked. 289 */ 290 291 if (uh->uh_sum == 0) 292 return 0; 293 294 switch (m->m_pkthdr.csum_flags & 295 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 296 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 297 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 298 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 299 goto badcsum; 300 301 case M_CSUM_UDPv4|M_CSUM_DATA: { 302 u_int32_t hw_csum = m->m_pkthdr.csum_data; 303 304 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 305 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 306 const struct ip *ip = 307 mtod(m, const struct ip *); 308 309 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 310 ip->ip_dst.s_addr, 311 htons(hw_csum + len + IPPROTO_UDP)); 312 } 313 if ((hw_csum ^ 0xffff) != 0) 314 goto badcsum; 315 break; 316 } 317 318 case M_CSUM_UDPv4: 319 /* Checksum was okay. */ 320 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 321 break; 322 323 default: 324 /* 325 * Need to compute it ourselves. Maybe skip checksum 326 * on loopback interfaces. 327 */ 328 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 329 IFF_LOOPBACK) || 330 udp_do_loopback_cksum)) { 331 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 332 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 333 goto badcsum; 334 } 335 break; 336 } 337 338 return 0; 339 340 badcsum: 341 UDP_STATINC(UDP_STAT_BADSUM); 342 return -1; 343 } 344 345 void 346 udp_input(struct mbuf *m, ...) 347 { 348 va_list ap; 349 struct sockaddr_in src, dst; 350 struct ip *ip; 351 struct udphdr *uh; 352 int iphlen; 353 int len; 354 int n; 355 u_int16_t ip_len; 356 357 va_start(ap, m); 358 iphlen = va_arg(ap, int); 359 (void)va_arg(ap, int); /* ignore value, advance ap */ 360 va_end(ap); 361 362 MCLAIM(m, &udp_rx_mowner); 363 UDP_STATINC(UDP_STAT_IPACKETS); 364 365 /* 366 * Get IP and UDP header together in first mbuf. 367 */ 368 ip = mtod(m, struct ip *); 369 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 370 if (uh == NULL) { 371 UDP_STATINC(UDP_STAT_HDROPS); 372 return; 373 } 374 KASSERT(UDP_HDR_ALIGNED_P(uh)); 375 376 /* destination port of 0 is illegal, based on RFC768. */ 377 if (uh->uh_dport == 0) 378 goto bad; 379 380 /* 381 * Make mbuf data length reflect UDP length. 382 * If not enough data to reflect UDP length, drop. 383 */ 384 ip_len = ntohs(ip->ip_len); 385 len = ntohs((u_int16_t)uh->uh_ulen); 386 if (ip_len != iphlen + len) { 387 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 388 UDP_STATINC(UDP_STAT_BADLEN); 389 goto bad; 390 } 391 m_adj(m, iphlen + len - ip_len); 392 } 393 394 /* 395 * Checksum extended UDP header and data. 396 */ 397 if (udp4_input_checksum(m, uh, iphlen, len)) 398 goto badcsum; 399 400 /* construct source and dst sockaddrs. */ 401 sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport); 402 sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport); 403 404 if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { 405 UDP_STATINC(UDP_STAT_HDROPS); 406 return; 407 } 408 #ifdef INET6 409 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 410 struct sockaddr_in6 src6, dst6; 411 412 memset(&src6, 0, sizeof(src6)); 413 src6.sin6_family = AF_INET6; 414 src6.sin6_len = sizeof(struct sockaddr_in6); 415 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 416 memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src, 417 sizeof(ip->ip_src)); 418 src6.sin6_port = uh->uh_sport; 419 memset(&dst6, 0, sizeof(dst6)); 420 dst6.sin6_family = AF_INET6; 421 dst6.sin6_len = sizeof(struct sockaddr_in6); 422 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 423 memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst, 424 sizeof(ip->ip_dst)); 425 dst6.sin6_port = uh->uh_dport; 426 427 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 428 } 429 #endif 430 431 if (n == 0) { 432 if (m->m_flags & (M_BCAST | M_MCAST)) { 433 UDP_STATINC(UDP_STAT_NOPORTBCAST); 434 goto bad; 435 } 436 UDP_STATINC(UDP_STAT_NOPORT); 437 #ifdef IPKDB 438 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 439 m, iphlen + sizeof(struct udphdr), 440 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 441 /* 442 * It was a debugger connect packet, 443 * just drop it now 444 */ 445 goto bad; 446 } 447 #endif 448 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 449 m = NULL; 450 } 451 452 bad: 453 if (m) 454 m_freem(m); 455 return; 456 457 badcsum: 458 m_freem(m); 459 } 460 #endif 461 462 #ifdef INET6 463 static int 464 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 465 { 466 467 /* 468 * XXX it's better to record and check if this mbuf is 469 * already checked. 470 */ 471 472 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 473 goto good; 474 } 475 if (uh->uh_sum == 0) { 476 UDP6_STATINC(UDP6_STAT_NOSUM); 477 goto bad; 478 } 479 480 switch (m->m_pkthdr.csum_flags & 481 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 482 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 483 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 484 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 485 UDP6_STATINC(UDP6_STAT_BADSUM); 486 goto bad; 487 488 #if 0 /* notyet */ 489 case M_CSUM_UDPv6|M_CSUM_DATA: 490 #endif 491 492 case M_CSUM_UDPv6: 493 /* Checksum was okay. */ 494 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 495 break; 496 497 default: 498 /* 499 * Need to compute it ourselves. Maybe skip checksum 500 * on loopback interfaces. 501 */ 502 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 503 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 504 UDP6_STATINC(UDP6_STAT_BADSUM); 505 goto bad; 506 } 507 } 508 509 good: 510 return 0; 511 bad: 512 return -1; 513 } 514 515 int 516 udp6_input(struct mbuf **mp, int *offp, int proto) 517 { 518 struct mbuf *m = *mp; 519 int off = *offp; 520 struct sockaddr_in6 src, dst; 521 struct ip6_hdr *ip6; 522 struct udphdr *uh; 523 u_int32_t plen, ulen; 524 525 ip6 = mtod(m, struct ip6_hdr *); 526 527 #if defined(NFAITH) && 0 < NFAITH 528 if (faithprefix(&ip6->ip6_dst)) { 529 /* send icmp6 host unreach? */ 530 m_freem(m); 531 return IPPROTO_DONE; 532 } 533 #endif 534 535 UDP6_STATINC(UDP6_STAT_IPACKETS); 536 537 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 538 plen = m->m_pkthdr.len - off; 539 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 540 if (uh == NULL) { 541 IP6_STATINC(IP6_STAT_TOOSHORT); 542 return IPPROTO_DONE; 543 } 544 KASSERT(UDP_HDR_ALIGNED_P(uh)); 545 ulen = ntohs((u_short)uh->uh_ulen); 546 /* 547 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 548 * iff payload length > 0xffff. 549 */ 550 if (ulen == 0 && plen > 0xffff) 551 ulen = plen; 552 553 if (plen != ulen) { 554 UDP6_STATINC(UDP6_STAT_BADLEN); 555 goto bad; 556 } 557 558 /* destination port of 0 is illegal, based on RFC768. */ 559 if (uh->uh_dport == 0) 560 goto bad; 561 562 /* Be proactive about malicious use of IPv4 mapped address */ 563 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 564 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 565 /* XXX stat */ 566 goto bad; 567 } 568 569 /* 570 * Checksum extended UDP header and data. Maybe skip checksum 571 * on loopback interfaces. 572 */ 573 if (udp6_input_checksum(m, uh, off, ulen)) 574 goto bad; 575 576 /* 577 * Construct source and dst sockaddrs. 578 */ 579 memset(&src, 0, sizeof(src)); 580 src.sin6_family = AF_INET6; 581 src.sin6_len = sizeof(struct sockaddr_in6); 582 src.sin6_addr = ip6->ip6_src; 583 src.sin6_port = uh->uh_sport; 584 memset(&dst, 0, sizeof(dst)); 585 dst.sin6_family = AF_INET6; 586 dst.sin6_len = sizeof(struct sockaddr_in6); 587 dst.sin6_addr = ip6->ip6_dst; 588 dst.sin6_port = uh->uh_dport; 589 590 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 591 if (m->m_flags & M_MCAST) { 592 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 593 goto bad; 594 } 595 UDP6_STATINC(UDP6_STAT_NOPORT); 596 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 597 m = NULL; 598 } 599 600 bad: 601 if (m) 602 m_freem(m); 603 return IPPROTO_DONE; 604 } 605 #endif 606 607 #ifdef INET 608 static void 609 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 610 struct sockaddr *src, struct socket *so) 611 { 612 struct mbuf *opts = NULL; 613 struct mbuf *n; 614 struct inpcb *inp = NULL; 615 616 if (!so) 617 return; 618 switch (so->so_proto->pr_domain->dom_family) { 619 case AF_INET: 620 inp = sotoinpcb(so); 621 break; 622 #ifdef INET6 623 case AF_INET6: 624 break; 625 #endif 626 default: 627 return; 628 } 629 630 #if defined(FAST_IPSEC) 631 /* check AH/ESP integrity. */ 632 if (so != NULL && ipsec4_in_reject_so(m, so)) { 633 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 634 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 635 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 636 0, 0); 637 return; 638 } 639 #endif /*IPSEC*/ 640 641 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 642 if (inp && (inp->inp_flags & INP_CONTROLOPTS 643 #ifdef SO_OTIMESTAMP 644 || so->so_options & SO_OTIMESTAMP 645 #endif 646 || so->so_options & SO_TIMESTAMP)) { 647 struct ip *ip = mtod(n, struct ip *); 648 ip_savecontrol(inp, &opts, ip, n); 649 } 650 651 m_adj(n, off); 652 if (sbappendaddr(&so->so_rcv, src, n, 653 opts) == 0) { 654 m_freem(n); 655 if (opts) 656 m_freem(opts); 657 so->so_rcv.sb_overflowed++; 658 UDP_STATINC(UDP_STAT_FULLSOCK); 659 } else 660 sorwakeup(so); 661 } 662 } 663 #endif 664 665 #ifdef INET6 666 static void 667 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 668 struct sockaddr *src, struct socket *so) 669 { 670 struct mbuf *opts = NULL; 671 struct mbuf *n; 672 struct in6pcb *in6p = NULL; 673 674 if (!so) 675 return; 676 if (so->so_proto->pr_domain->dom_family != AF_INET6) 677 return; 678 in6p = sotoin6pcb(so); 679 680 #if defined(FAST_IPSEC) 681 /* check AH/ESP integrity. */ 682 if (so != NULL && ipsec6_in_reject_so(m, so)) { 683 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 684 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 685 icmp6_error(n, ICMP6_DST_UNREACH, 686 ICMP6_DST_UNREACH_ADMIN, 0); 687 return; 688 } 689 #endif /*IPSEC*/ 690 691 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 692 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 693 #ifdef SO_OTIMESTAMP 694 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 695 #endif 696 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 697 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 698 ip6_savecontrol(in6p, &opts, ip6, n); 699 } 700 701 m_adj(n, off); 702 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 703 m_freem(n); 704 if (opts) 705 m_freem(opts); 706 so->so_rcv.sb_overflowed++; 707 UDP6_STATINC(UDP6_STAT_FULLSOCK); 708 } else 709 sorwakeup(so); 710 } 711 } 712 #endif 713 714 #ifdef INET 715 static int 716 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 717 struct mbuf **mp, int off /* offset of udphdr */) 718 { 719 u_int16_t *sport, *dport; 720 int rcvcnt; 721 struct in_addr *src4, *dst4; 722 struct inpcb_hdr *inph; 723 struct inpcb *inp; 724 struct mbuf *m = *mp; 725 726 rcvcnt = 0; 727 off += sizeof(struct udphdr); /* now, offset of payload */ 728 729 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 730 goto bad; 731 732 src4 = &src->sin_addr; 733 sport = &src->sin_port; 734 dst4 = &dst->sin_addr; 735 dport = &dst->sin_port; 736 737 if (IN_MULTICAST(dst4->s_addr) || 738 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 739 /* 740 * Deliver a multicast or broadcast datagram to *all* sockets 741 * for which the local and remote addresses and ports match 742 * those of the incoming datagram. This allows more than 743 * one process to receive multi/broadcasts on the same port. 744 * (This really ought to be done for unicast datagrams as 745 * well, but that would cause problems with existing 746 * applications that open both address-specific sockets and 747 * a wildcard socket listening to the same port -- they would 748 * end up receiving duplicates of every unicast datagram. 749 * Those applications open the multiple sockets to overcome an 750 * inadequacy of the UDP socket interface, but for backwards 751 * compatibility we avoid the problem here rather than 752 * fixing the interface. Maybe 4.5BSD will remedy this?) 753 */ 754 755 /* 756 * KAME note: traditionally we dropped udpiphdr from mbuf here. 757 * we need udpiphdr for IPsec processing so we do that later. 758 */ 759 /* 760 * Locate pcb(s) for datagram. 761 */ 762 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 763 inp = (struct inpcb *)inph; 764 if (inp->inp_af != AF_INET) 765 continue; 766 767 if (inp->inp_lport != *dport) 768 continue; 769 if (!in_nullhost(inp->inp_laddr)) { 770 if (!in_hosteq(inp->inp_laddr, *dst4)) 771 continue; 772 } 773 if (!in_nullhost(inp->inp_faddr)) { 774 if (!in_hosteq(inp->inp_faddr, *src4) || 775 inp->inp_fport != *sport) 776 continue; 777 } 778 779 udp4_sendup(m, off, (struct sockaddr *)src, 780 inp->inp_socket); 781 rcvcnt++; 782 783 /* 784 * Don't look for additional matches if this one does 785 * not have either the SO_REUSEPORT or SO_REUSEADDR 786 * socket options set. This heuristic avoids searching 787 * through all pcbs in the common case of a non-shared 788 * port. It assumes that an application will never 789 * clear these options after setting them. 790 */ 791 if ((inp->inp_socket->so_options & 792 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 793 break; 794 } 795 } else { 796 /* 797 * Locate pcb for datagram. 798 */ 799 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, 800 *dport, 0); 801 if (inp == 0) { 802 UDP_STATINC(UDP_STAT_PCBHASHMISS); 803 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 804 if (inp == 0) 805 return rcvcnt; 806 } 807 808 #ifdef IPSEC_NAT_T 809 /* Handle ESP over UDP */ 810 if (inp->inp_flags & INP_ESPINUDP_ALL) { 811 struct sockaddr *sa = (struct sockaddr *)src; 812 813 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 814 case -1: /* Error, m was freeed */ 815 rcvcnt = -1; 816 goto bad; 817 break; 818 819 case 1: /* ESP over UDP */ 820 rcvcnt++; 821 goto bad; 822 break; 823 824 case 0: /* plain UDP */ 825 default: /* Unexpected */ 826 /* 827 * Normal UDP processing will take place 828 * m may have changed. 829 */ 830 m = *mp; 831 break; 832 } 833 } 834 #endif 835 836 /* 837 * Check the minimum TTL for socket. 838 */ 839 if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl) 840 goto bad; 841 842 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 843 rcvcnt++; 844 } 845 846 bad: 847 return rcvcnt; 848 } 849 #endif 850 851 #ifdef INET6 852 static int 853 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 854 struct mbuf *m, int off) 855 { 856 u_int16_t sport, dport; 857 int rcvcnt; 858 struct in6_addr src6, *dst6; 859 const struct in_addr *dst4; 860 struct inpcb_hdr *inph; 861 struct in6pcb *in6p; 862 863 rcvcnt = 0; 864 off += sizeof(struct udphdr); /* now, offset of payload */ 865 866 if (af != AF_INET && af != AF_INET6) 867 goto bad; 868 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 869 goto bad; 870 871 src6 = src->sin6_addr; 872 if (sa6_recoverscope(src) != 0) { 873 /* XXX: should be impossible. */ 874 goto bad; 875 } 876 sport = src->sin6_port; 877 878 dport = dst->sin6_port; 879 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 880 dst6 = &dst->sin6_addr; 881 882 if (IN6_IS_ADDR_MULTICAST(dst6) || 883 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 884 /* 885 * Deliver a multicast or broadcast datagram to *all* sockets 886 * for which the local and remote addresses and ports match 887 * those of the incoming datagram. This allows more than 888 * one process to receive multi/broadcasts on the same port. 889 * (This really ought to be done for unicast datagrams as 890 * well, but that would cause problems with existing 891 * applications that open both address-specific sockets and 892 * a wildcard socket listening to the same port -- they would 893 * end up receiving duplicates of every unicast datagram. 894 * Those applications open the multiple sockets to overcome an 895 * inadequacy of the UDP socket interface, but for backwards 896 * compatibility we avoid the problem here rather than 897 * fixing the interface. Maybe 4.5BSD will remedy this?) 898 */ 899 900 /* 901 * KAME note: traditionally we dropped udpiphdr from mbuf here. 902 * we need udpiphdr for IPsec processing so we do that later. 903 */ 904 /* 905 * Locate pcb(s) for datagram. 906 */ 907 CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 908 in6p = (struct in6pcb *)inph; 909 if (in6p->in6p_af != AF_INET6) 910 continue; 911 912 if (in6p->in6p_lport != dport) 913 continue; 914 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 915 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 916 dst6)) 917 continue; 918 } else { 919 if (IN6_IS_ADDR_V4MAPPED(dst6) && 920 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 921 continue; 922 } 923 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 924 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 925 &src6) || in6p->in6p_fport != sport) 926 continue; 927 } else { 928 if (IN6_IS_ADDR_V4MAPPED(&src6) && 929 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 930 continue; 931 } 932 933 udp6_sendup(m, off, (struct sockaddr *)src, 934 in6p->in6p_socket); 935 rcvcnt++; 936 937 /* 938 * Don't look for additional matches if this one does 939 * not have either the SO_REUSEPORT or SO_REUSEADDR 940 * socket options set. This heuristic avoids searching 941 * through all pcbs in the common case of a non-shared 942 * port. It assumes that an application will never 943 * clear these options after setting them. 944 */ 945 if ((in6p->in6p_socket->so_options & 946 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 947 break; 948 } 949 } else { 950 /* 951 * Locate pcb for datagram. 952 */ 953 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 954 dport, 0, 0); 955 if (in6p == 0) { 956 UDP_STATINC(UDP_STAT_PCBHASHMISS); 957 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 958 if (in6p == 0) 959 return rcvcnt; 960 } 961 962 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 963 rcvcnt++; 964 } 965 966 bad: 967 return rcvcnt; 968 } 969 #endif 970 971 #ifdef INET 972 /* 973 * Notify a udp user of an asynchronous error; 974 * just wake up so that he can collect error status. 975 */ 976 static void 977 udp_notify(struct inpcb *inp, int errno) 978 { 979 inp->inp_socket->so_error = errno; 980 sorwakeup(inp->inp_socket); 981 sowwakeup(inp->inp_socket); 982 } 983 984 void * 985 udp_ctlinput(int cmd, const struct sockaddr *sa, void *v) 986 { 987 struct ip *ip = v; 988 struct udphdr *uh; 989 void (*notify)(struct inpcb *, int) = udp_notify; 990 int errno; 991 992 if (sa->sa_family != AF_INET 993 || sa->sa_len != sizeof(struct sockaddr_in)) 994 return NULL; 995 if ((unsigned)cmd >= PRC_NCMDS) 996 return NULL; 997 errno = inetctlerrmap[cmd]; 998 if (PRC_IS_REDIRECT(cmd)) 999 notify = in_rtchange, ip = 0; 1000 else if (cmd == PRC_HOSTDEAD) 1001 ip = 0; 1002 else if (errno == 0) 1003 return NULL; 1004 if (ip) { 1005 uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2)); 1006 in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport, 1007 ip->ip_src, uh->uh_sport, errno, notify); 1008 1009 /* XXX mapped address case */ 1010 } else 1011 in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno, 1012 notify); 1013 return NULL; 1014 } 1015 1016 int 1017 udp_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1018 { 1019 int s; 1020 int error = 0; 1021 struct inpcb *inp; 1022 int family; 1023 int optval; 1024 1025 family = so->so_proto->pr_domain->dom_family; 1026 1027 s = splsoftnet(); 1028 switch (family) { 1029 #ifdef INET 1030 case PF_INET: 1031 if (sopt->sopt_level != IPPROTO_UDP) { 1032 error = ip_ctloutput(op, so, sopt); 1033 goto end; 1034 } 1035 break; 1036 #endif 1037 #ifdef INET6 1038 case PF_INET6: 1039 if (sopt->sopt_level != IPPROTO_UDP) { 1040 error = ip6_ctloutput(op, so, sopt); 1041 goto end; 1042 } 1043 break; 1044 #endif 1045 default: 1046 error = EAFNOSUPPORT; 1047 goto end; 1048 } 1049 1050 1051 switch (op) { 1052 case PRCO_SETOPT: 1053 inp = sotoinpcb(so); 1054 1055 switch (sopt->sopt_name) { 1056 case UDP_ENCAP: 1057 error = sockopt_getint(sopt, &optval); 1058 if (error) 1059 break; 1060 1061 switch(optval) { 1062 #ifdef IPSEC_NAT_T 1063 case 0: 1064 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1065 break; 1066 1067 case UDP_ENCAP_ESPINUDP: 1068 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1069 inp->inp_flags |= INP_ESPINUDP; 1070 break; 1071 1072 case UDP_ENCAP_ESPINUDP_NON_IKE: 1073 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1074 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1075 break; 1076 #endif 1077 default: 1078 error = EINVAL; 1079 break; 1080 } 1081 break; 1082 1083 case UDP_RFC6056ALGO: 1084 error = sockopt_getint(sopt, &optval); 1085 if (error) 1086 break; 1087 1088 error = rfc6056_algo_index_select( 1089 (struct inpcb_hdr *)inp, optval); 1090 break; 1091 1092 default: 1093 error = ENOPROTOOPT; 1094 break; 1095 } 1096 break; 1097 1098 default: 1099 error = EINVAL; 1100 break; 1101 } 1102 1103 end: 1104 splx(s); 1105 return error; 1106 } 1107 1108 1109 int 1110 udp_output(struct mbuf *m, ...) 1111 { 1112 struct inpcb *inp; 1113 struct udpiphdr *ui; 1114 struct route *ro; 1115 int len = m->m_pkthdr.len; 1116 int error = 0; 1117 va_list ap; 1118 1119 MCLAIM(m, &udp_tx_mowner); 1120 va_start(ap, m); 1121 inp = va_arg(ap, struct inpcb *); 1122 va_end(ap); 1123 1124 /* 1125 * Calculate data length and get a mbuf 1126 * for UDP and IP headers. 1127 */ 1128 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1129 if (m == 0) { 1130 error = ENOBUFS; 1131 goto release; 1132 } 1133 1134 /* 1135 * Compute the packet length of the IP header, and 1136 * punt if the length looks bogus. 1137 */ 1138 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1139 error = EMSGSIZE; 1140 goto release; 1141 } 1142 1143 /* 1144 * Fill in mbuf with extended UDP header 1145 * and addresses and length put into network format. 1146 */ 1147 ui = mtod(m, struct udpiphdr *); 1148 ui->ui_pr = IPPROTO_UDP; 1149 ui->ui_src = inp->inp_laddr; 1150 ui->ui_dst = inp->inp_faddr; 1151 ui->ui_sport = inp->inp_lport; 1152 ui->ui_dport = inp->inp_fport; 1153 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1154 1155 ro = &inp->inp_route; 1156 1157 /* 1158 * Set up checksum and output datagram. 1159 */ 1160 if (udpcksum) { 1161 /* 1162 * XXX Cache pseudo-header checksum part for 1163 * XXX "connected" UDP sockets. 1164 */ 1165 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1166 ui->ui_dst.s_addr, htons((u_int16_t)len + 1167 sizeof(struct udphdr) + IPPROTO_UDP)); 1168 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1169 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1170 } else 1171 ui->ui_sum = 0; 1172 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1173 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1174 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1175 UDP_STATINC(UDP_STAT_OPACKETS); 1176 1177 return (ip_output(m, inp->inp_options, ro, 1178 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1179 inp->inp_moptions, inp->inp_socket)); 1180 1181 release: 1182 m_freem(m); 1183 return (error); 1184 } 1185 1186 int udp_sendspace = 9216; /* really max datagram size */ 1187 int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 1188 /* 40 1K datagrams */ 1189 1190 /*ARGSUSED*/ 1191 int 1192 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1193 struct mbuf *control, struct lwp *l) 1194 { 1195 struct inpcb *inp; 1196 int s; 1197 int error = 0; 1198 1199 if (req == PRU_CONTROL) 1200 return (in_control(so, (long)m, (void *)nam, 1201 (struct ifnet *)control, l)); 1202 1203 s = splsoftnet(); 1204 1205 if (req == PRU_PURGEIF) { 1206 mutex_enter(softnet_lock); 1207 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1208 in_purgeif((struct ifnet *)control); 1209 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1210 mutex_exit(softnet_lock); 1211 splx(s); 1212 return (0); 1213 } 1214 1215 inp = sotoinpcb(so); 1216 #ifdef DIAGNOSTIC 1217 if (req != PRU_SEND && req != PRU_SENDOOB && control) 1218 panic("udp_usrreq: unexpected control mbuf"); 1219 #endif 1220 if (req == PRU_ATTACH) { 1221 sosetlock(so); 1222 } else if (inp == 0) { 1223 error = EINVAL; 1224 goto release; 1225 } 1226 1227 /* 1228 * Note: need to block udp_input while changing 1229 * the udp pcb queue and/or pcb addresses. 1230 */ 1231 switch (req) { 1232 1233 case PRU_ATTACH: 1234 if (inp != 0) { 1235 error = EISCONN; 1236 break; 1237 } 1238 #ifdef MBUFTRACE 1239 so->so_mowner = &udp_mowner; 1240 so->so_rcv.sb_mowner = &udp_rx_mowner; 1241 so->so_snd.sb_mowner = &udp_tx_mowner; 1242 #endif 1243 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1244 error = soreserve(so, udp_sendspace, udp_recvspace); 1245 if (error) 1246 break; 1247 } 1248 error = in_pcballoc(so, &udbtable); 1249 if (error) 1250 break; 1251 inp = sotoinpcb(so); 1252 inp->inp_ip.ip_ttl = ip_defttl; 1253 break; 1254 1255 case PRU_DETACH: 1256 in_pcbdetach(inp); 1257 break; 1258 1259 case PRU_BIND: 1260 error = in_pcbbind(inp, nam, l); 1261 break; 1262 1263 case PRU_LISTEN: 1264 error = EOPNOTSUPP; 1265 break; 1266 1267 case PRU_CONNECT: 1268 error = in_pcbconnect(inp, nam, l); 1269 if (error) 1270 break; 1271 soisconnected(so); 1272 break; 1273 1274 case PRU_CONNECT2: 1275 error = EOPNOTSUPP; 1276 break; 1277 1278 case PRU_DISCONNECT: 1279 /*soisdisconnected(so);*/ 1280 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1281 in_pcbdisconnect(inp); 1282 inp->inp_laddr = zeroin_addr; /* XXX */ 1283 in_pcbstate(inp, INP_BOUND); /* XXX */ 1284 break; 1285 1286 case PRU_SHUTDOWN: 1287 socantsendmore(so); 1288 break; 1289 1290 case PRU_RCVD: 1291 error = EOPNOTSUPP; 1292 break; 1293 1294 case PRU_SEND: 1295 if (control && control->m_len) { 1296 m_freem(control); 1297 m_freem(m); 1298 error = EINVAL; 1299 break; 1300 } 1301 { 1302 struct in_addr laddr; /* XXX */ 1303 1304 memset(&laddr, 0, sizeof laddr); 1305 if (nam) { 1306 laddr = inp->inp_laddr; /* XXX */ 1307 if ((so->so_state & SS_ISCONNECTED) != 0) { 1308 error = EISCONN; 1309 goto die; 1310 } 1311 error = in_pcbconnect(inp, nam, l); 1312 if (error) 1313 goto die; 1314 } else { 1315 if ((so->so_state & SS_ISCONNECTED) == 0) { 1316 error = ENOTCONN; 1317 goto die; 1318 } 1319 } 1320 error = udp_output(m, inp); 1321 m = NULL; 1322 if (nam) { 1323 in_pcbdisconnect(inp); 1324 inp->inp_laddr = laddr; /* XXX */ 1325 in_pcbstate(inp, INP_BOUND); /* XXX */ 1326 } 1327 die: 1328 if (m) 1329 m_freem(m); 1330 } 1331 break; 1332 1333 case PRU_SENSE: 1334 /* 1335 * stat: don't bother with a blocksize. 1336 */ 1337 splx(s); 1338 return (0); 1339 1340 case PRU_RCVOOB: 1341 error = EOPNOTSUPP; 1342 break; 1343 1344 case PRU_SENDOOB: 1345 m_freem(control); 1346 m_freem(m); 1347 error = EOPNOTSUPP; 1348 break; 1349 1350 case PRU_SOCKADDR: 1351 in_setsockaddr(inp, nam); 1352 break; 1353 1354 case PRU_PEERADDR: 1355 in_setpeeraddr(inp, nam); 1356 break; 1357 1358 default: 1359 panic("udp_usrreq"); 1360 } 1361 1362 release: 1363 splx(s); 1364 return (error); 1365 } 1366 1367 static int 1368 sysctl_net_inet_udp_stats(SYSCTLFN_ARGS) 1369 { 1370 1371 return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS)); 1372 } 1373 1374 /* 1375 * Sysctl for udp variables. 1376 */ 1377 static void 1378 sysctl_net_inet_udp_setup(struct sysctllog **clog) 1379 { 1380 const struct sysctlnode *rfc6056_node; 1381 1382 sysctl_createv(clog, 0, NULL, NULL, 1383 CTLFLAG_PERMANENT, 1384 CTLTYPE_NODE, "net", NULL, 1385 NULL, 0, NULL, 0, 1386 CTL_NET, CTL_EOL); 1387 sysctl_createv(clog, 0, NULL, NULL, 1388 CTLFLAG_PERMANENT, 1389 CTLTYPE_NODE, "inet", NULL, 1390 NULL, 0, NULL, 0, 1391 CTL_NET, PF_INET, CTL_EOL); 1392 sysctl_createv(clog, 0, NULL, NULL, 1393 CTLFLAG_PERMANENT, 1394 CTLTYPE_NODE, "udp", 1395 SYSCTL_DESCR("UDPv4 related settings"), 1396 NULL, 0, NULL, 0, 1397 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1398 1399 sysctl_createv(clog, 0, NULL, NULL, 1400 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1401 CTLTYPE_INT, "checksum", 1402 SYSCTL_DESCR("Compute UDP checksums"), 1403 NULL, 0, &udpcksum, 0, 1404 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1405 CTL_EOL); 1406 sysctl_createv(clog, 0, NULL, NULL, 1407 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1408 CTLTYPE_INT, "sendspace", 1409 SYSCTL_DESCR("Default UDP send buffer size"), 1410 NULL, 0, &udp_sendspace, 0, 1411 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1412 CTL_EOL); 1413 sysctl_createv(clog, 0, NULL, NULL, 1414 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1415 CTLTYPE_INT, "recvspace", 1416 SYSCTL_DESCR("Default UDP receive buffer size"), 1417 NULL, 0, &udp_recvspace, 0, 1418 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1419 CTL_EOL); 1420 sysctl_createv(clog, 0, NULL, NULL, 1421 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1422 CTLTYPE_INT, "do_loopback_cksum", 1423 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1424 NULL, 0, &udp_do_loopback_cksum, 0, 1425 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1426 CTL_EOL); 1427 sysctl_createv(clog, 0, NULL, NULL, 1428 CTLFLAG_PERMANENT, 1429 CTLTYPE_STRUCT, "pcblist", 1430 SYSCTL_DESCR("UDP protocol control block list"), 1431 sysctl_inpcblist, 0, &udbtable, 0, 1432 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1433 CTL_EOL); 1434 sysctl_createv(clog, 0, NULL, NULL, 1435 CTLFLAG_PERMANENT, 1436 CTLTYPE_STRUCT, "stats", 1437 SYSCTL_DESCR("UDP statistics"), 1438 sysctl_net_inet_udp_stats, 0, NULL, 0, 1439 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1440 CTL_EOL); 1441 /* RFC6056 subtree */ 1442 sysctl_createv(clog, 0, NULL, &rfc6056_node, 1443 CTLFLAG_PERMANENT, 1444 CTLTYPE_NODE, "rfc6056", 1445 SYSCTL_DESCR("RFC 6056"), 1446 NULL, 0, NULL, 0, 1447 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, CTL_EOL); 1448 sysctl_createv(clog, 0, &rfc6056_node, NULL, 1449 CTLFLAG_PERMANENT, 1450 CTLTYPE_STRING, "available", 1451 SYSCTL_DESCR("RFC 6056 available algorithms"), 1452 sysctl_rfc6056_available, 0, NULL, RFC6056_MAXLEN, 1453 CTL_CREATE, CTL_EOL); 1454 sysctl_createv(clog, 0, &rfc6056_node, NULL, 1455 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1456 CTLTYPE_STRING, "selected", 1457 SYSCTL_DESCR("RFC 6056 selected algorithm"), 1458 sysctl_rfc6056_selected, 0, NULL, RFC6056_MAXLEN, 1459 CTL_CREATE, CTL_EOL); 1460 } 1461 #endif 1462 1463 void 1464 udp_statinc(u_int stat) 1465 { 1466 1467 KASSERT(stat < UDP_NSTATS); 1468 UDP_STATINC(stat); 1469 } 1470 1471 #if (defined INET && defined IPSEC_NAT_T) 1472 /* 1473 * Returns: 1474 * 1 if the packet was processed 1475 * 0 if normal UDP processing should take place 1476 * -1 if an error occurent and m was freed 1477 */ 1478 static int 1479 udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src, 1480 struct socket *so) 1481 { 1482 size_t len; 1483 void *data; 1484 struct inpcb *inp; 1485 size_t skip = 0; 1486 size_t minlen; 1487 size_t iphdrlen; 1488 struct ip *ip; 1489 struct mbuf *n; 1490 struct m_tag *tag; 1491 struct udphdr *udphdr; 1492 u_int16_t sport, dport; 1493 struct mbuf *m = *mp; 1494 1495 /* 1496 * Collapse the mbuf chain if the first mbuf is too short 1497 * The longest case is: UDP + non ESP marker + ESP 1498 */ 1499 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1500 if (minlen > m->m_pkthdr.len) 1501 minlen = m->m_pkthdr.len; 1502 1503 if (m->m_len < minlen) { 1504 if ((*mp = m_pullup(m, minlen)) == NULL) { 1505 printf("udp4_espinudp: m_pullup failed\n"); 1506 return -1; 1507 } 1508 m = *mp; 1509 } 1510 1511 len = m->m_len - off; 1512 data = mtod(m, char *) + off; 1513 inp = sotoinpcb(so); 1514 1515 /* Ignore keepalive packets */ 1516 if ((len == 1) && (*(unsigned char *)data == 0xff)) { 1517 return 1; 1518 } 1519 1520 /* 1521 * Check that the payload is long enough to hold 1522 * an ESP header and compute the length of encapsulation 1523 * header to remove 1524 */ 1525 if (inp->inp_flags & INP_ESPINUDP) { 1526 u_int32_t *st = (u_int32_t *)data; 1527 1528 if ((len <= sizeof(struct esp)) || (*st == 0)) 1529 return 0; /* Normal UDP processing */ 1530 1531 skip = sizeof(struct udphdr); 1532 } 1533 1534 if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { 1535 u_int32_t *st = (u_int32_t *)data; 1536 1537 if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) 1538 || ((st[0] | st[1]) != 0)) 1539 return 0; /* Normal UDP processing */ 1540 1541 skip = sizeof(struct udphdr) + sizeof(u_int64_t); 1542 } 1543 1544 /* 1545 * Get the UDP ports. They are handled in network 1546 * order everywhere in IPSEC_NAT_T code. 1547 */ 1548 udphdr = (struct udphdr *)((char *)data - skip); 1549 sport = udphdr->uh_sport; 1550 dport = udphdr->uh_dport; 1551 1552 /* 1553 * Remove the UDP header (and possibly the non ESP marker) 1554 * IP header lendth is iphdrlen 1555 * Before: 1556 * <--- off ---> 1557 * +----+------+-----+ 1558 * | IP | UDP | ESP | 1559 * +----+------+-----+ 1560 * <-skip-> 1561 * After: 1562 * +----+-----+ 1563 * | IP | ESP | 1564 * +----+-----+ 1565 * <-skip-> 1566 */ 1567 iphdrlen = off - sizeof(struct udphdr); 1568 memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen); 1569 m_adj(m, skip); 1570 1571 ip = mtod(m, struct ip *); 1572 ip->ip_len = htons(ntohs(ip->ip_len) - skip); 1573 ip->ip_p = IPPROTO_ESP; 1574 1575 /* 1576 * Copy the mbuf to avoid multiple free, as both 1577 * esp4_input (which we call) and udp_input (which 1578 * called us) free the mbuf. 1579 */ 1580 if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 1581 printf("udp4_espinudp: m_dup failed\n"); 1582 return 0; 1583 } 1584 1585 /* 1586 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1587 * the source UDP port. This is required if we want 1588 * to select the right SPD for multiple hosts behind 1589 * same NAT 1590 */ 1591 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1592 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1593 printf("udp4_espinudp: m_tag_get failed\n"); 1594 m_freem(n); 1595 return 0; 1596 } 1597 ((u_int16_t *)(tag + 1))[0] = sport; 1598 ((u_int16_t *)(tag + 1))[1] = dport; 1599 m_tag_prepend(n, tag); 1600 1601 #ifdef FAST_IPSEC 1602 ipsec4_common_input(n, iphdrlen, IPPROTO_ESP); 1603 #else 1604 esp4_input(n, iphdrlen); 1605 #endif 1606 1607 /* We handled it, it shouldn't be handled by UDP */ 1608 return 1; 1609 } 1610 #endif 1611
Indexes created Fri Sep 26 20:09:58 GMT 2025