udp_usrreq.c revision 1.196
1 /* $NetBSD: udp_usrreq.c,v 1.196 2014/05/19 02:51:25 rmind 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 1.196 2014/05/19 02:51:25 rmind 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/once.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/errno.h> 81 #include <sys/stat.h> 82 #include <sys/systm.h> 83 #include <sys/proc.h> 84 #include <sys/domain.h> 85 #include <sys/sysctl.h> 86 87 #include <net/if.h> 88 #include <net/route.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_systm.h> 92 #include <netinet/in_var.h> 93 #include <netinet/ip.h> 94 #include <netinet/in_pcb.h> 95 #include <netinet/ip_var.h> 96 #include <netinet/ip_icmp.h> 97 #include <netinet/udp.h> 98 #include <netinet/udp_var.h> 99 #include <netinet/udp_private.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 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 /* 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 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 /* 179 * For send - really max datagram size; for receive - 40 1K datagrams. 180 */ 181 static int udp_sendspace = 9216; 182 static int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 183 184 #ifdef MBUFTRACE 185 struct mowner udp_mowner = MOWNER_INIT("udp", ""); 186 struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx"); 187 struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx"); 188 #endif 189 190 #ifdef UDP_CSUM_COUNTERS 191 #include <sys/device.h> 192 193 #if defined(INET) 194 struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 195 NULL, "udp", "hwcsum bad"); 196 struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 197 NULL, "udp", "hwcsum ok"); 198 struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 199 NULL, "udp", "hwcsum data"); 200 struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 201 NULL, "udp", "swcsum"); 202 203 EVCNT_ATTACH_STATIC(udp_hwcsum_bad); 204 EVCNT_ATTACH_STATIC(udp_hwcsum_ok); 205 EVCNT_ATTACH_STATIC(udp_hwcsum_data); 206 EVCNT_ATTACH_STATIC(udp_swcsum); 207 #endif /* defined(INET) */ 208 209 #if defined(INET6) 210 struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 211 NULL, "udp6", "hwcsum bad"); 212 struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 213 NULL, "udp6", "hwcsum ok"); 214 struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 215 NULL, "udp6", "hwcsum data"); 216 struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 217 NULL, "udp6", "swcsum"); 218 219 EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); 220 EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); 221 EVCNT_ATTACH_STATIC(udp6_hwcsum_data); 222 EVCNT_ATTACH_STATIC(udp6_swcsum); 223 #endif /* defined(INET6) */ 224 225 #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 226 227 #else 228 229 #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ 230 231 #endif /* UDP_CSUM_COUNTERS */ 232 233 static void sysctl_net_inet_udp_setup(struct sysctllog **); 234 235 static int 236 do_udpinit(void) 237 { 238 239 in_pcbinit(&udbtable, udbhashsize, udbhashsize); 240 udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS); 241 242 MOWNER_ATTACH(&udp_tx_mowner); 243 MOWNER_ATTACH(&udp_rx_mowner); 244 MOWNER_ATTACH(&udp_mowner); 245 246 return 0; 247 } 248 249 void 250 udp_init_common(void) 251 { 252 static ONCE_DECL(doudpinit); 253 254 RUN_ONCE(&doudpinit, do_udpinit); 255 } 256 257 void 258 udp_init(void) 259 { 260 261 sysctl_net_inet_udp_setup(NULL); 262 263 udp_init_common(); 264 } 265 266 /* 267 * Checksum extended UDP header and data. 268 */ 269 270 int 271 udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, 272 int iphlen, int len) 273 { 274 275 switch (af) { 276 #ifdef INET 277 case AF_INET: 278 return udp4_input_checksum(m, uh, iphlen, len); 279 #endif 280 #ifdef INET6 281 case AF_INET6: 282 return udp6_input_checksum(m, uh, iphlen, len); 283 #endif 284 } 285 #ifdef DIAGNOSTIC 286 panic("udp_input_checksum: unknown af %d", af); 287 #endif 288 /* NOTREACHED */ 289 return -1; 290 } 291 292 #ifdef INET 293 294 /* 295 * Checksum extended UDP header and data. 296 */ 297 298 static int 299 udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, 300 int iphlen, int len) 301 { 302 303 /* 304 * XXX it's better to record and check if this mbuf is 305 * already checked. 306 */ 307 308 if (uh->uh_sum == 0) 309 return 0; 310 311 switch (m->m_pkthdr.csum_flags & 312 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | 313 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 314 case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: 315 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); 316 goto badcsum; 317 318 case M_CSUM_UDPv4|M_CSUM_DATA: { 319 u_int32_t hw_csum = m->m_pkthdr.csum_data; 320 321 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); 322 if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { 323 const struct ip *ip = 324 mtod(m, const struct ip *); 325 326 hw_csum = in_cksum_phdr(ip->ip_src.s_addr, 327 ip->ip_dst.s_addr, 328 htons(hw_csum + len + IPPROTO_UDP)); 329 } 330 if ((hw_csum ^ 0xffff) != 0) 331 goto badcsum; 332 break; 333 } 334 335 case M_CSUM_UDPv4: 336 /* Checksum was okay. */ 337 UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); 338 break; 339 340 default: 341 /* 342 * Need to compute it ourselves. Maybe skip checksum 343 * on loopback interfaces. 344 */ 345 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 346 IFF_LOOPBACK) || 347 udp_do_loopback_cksum)) { 348 UDP_CSUM_COUNTER_INCR(&udp_swcsum); 349 if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) 350 goto badcsum; 351 } 352 break; 353 } 354 355 return 0; 356 357 badcsum: 358 UDP_STATINC(UDP_STAT_BADSUM); 359 return -1; 360 } 361 362 void 363 udp_input(struct mbuf *m, ...) 364 { 365 va_list ap; 366 struct sockaddr_in src, dst; 367 struct ip *ip; 368 struct udphdr *uh; 369 int iphlen; 370 int len; 371 int n; 372 u_int16_t ip_len; 373 374 va_start(ap, m); 375 iphlen = va_arg(ap, int); 376 (void)va_arg(ap, int); /* ignore value, advance ap */ 377 va_end(ap); 378 379 MCLAIM(m, &udp_rx_mowner); 380 UDP_STATINC(UDP_STAT_IPACKETS); 381 382 /* 383 * Get IP and UDP header together in first mbuf. 384 */ 385 ip = mtod(m, struct ip *); 386 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 387 if (uh == NULL) { 388 UDP_STATINC(UDP_STAT_HDROPS); 389 return; 390 } 391 KASSERT(UDP_HDR_ALIGNED_P(uh)); 392 393 /* destination port of 0 is illegal, based on RFC768. */ 394 if (uh->uh_dport == 0) 395 goto bad; 396 397 /* 398 * Make mbuf data length reflect UDP length. 399 * If not enough data to reflect UDP length, drop. 400 */ 401 ip_len = ntohs(ip->ip_len); 402 len = ntohs((u_int16_t)uh->uh_ulen); 403 if (ip_len != iphlen + len) { 404 if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { 405 UDP_STATINC(UDP_STAT_BADLEN); 406 goto bad; 407 } 408 m_adj(m, iphlen + len - ip_len); 409 } 410 411 /* 412 * Checksum extended UDP header and data. 413 */ 414 if (udp4_input_checksum(m, uh, iphlen, len)) 415 goto badcsum; 416 417 /* construct source and dst sockaddrs. */ 418 sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport); 419 sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport); 420 421 if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { 422 UDP_STATINC(UDP_STAT_HDROPS); 423 return; 424 } 425 if (m == NULL) { 426 /* 427 * packet has been processed by ESP stuff - 428 * e.g. dropped NAT-T-keep-alive-packet ... 429 */ 430 return; 431 } 432 ip = mtod(m, struct ip *); 433 #ifdef INET6 434 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { 435 struct sockaddr_in6 src6, dst6; 436 437 memset(&src6, 0, sizeof(src6)); 438 src6.sin6_family = AF_INET6; 439 src6.sin6_len = sizeof(struct sockaddr_in6); 440 src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; 441 memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src, 442 sizeof(ip->ip_src)); 443 src6.sin6_port = uh->uh_sport; 444 memset(&dst6, 0, sizeof(dst6)); 445 dst6.sin6_family = AF_INET6; 446 dst6.sin6_len = sizeof(struct sockaddr_in6); 447 dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; 448 memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst, 449 sizeof(ip->ip_dst)); 450 dst6.sin6_port = uh->uh_dport; 451 452 n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); 453 } 454 #endif 455 456 if (n == 0) { 457 if (m->m_flags & (M_BCAST | M_MCAST)) { 458 UDP_STATINC(UDP_STAT_NOPORTBCAST); 459 goto bad; 460 } 461 UDP_STATINC(UDP_STAT_NOPORT); 462 #ifdef IPKDB 463 if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, 464 m, iphlen + sizeof(struct udphdr), 465 m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { 466 /* 467 * It was a debugger connect packet, 468 * just drop it now 469 */ 470 goto bad; 471 } 472 #endif 473 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 474 m = NULL; 475 } 476 477 bad: 478 if (m) 479 m_freem(m); 480 return; 481 482 badcsum: 483 m_freem(m); 484 } 485 #endif 486 487 #ifdef INET6 488 static int 489 udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) 490 { 491 492 /* 493 * XXX it's better to record and check if this mbuf is 494 * already checked. 495 */ 496 497 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { 498 goto good; 499 } 500 if (uh->uh_sum == 0) { 501 UDP6_STATINC(UDP6_STAT_NOSUM); 502 goto bad; 503 } 504 505 switch (m->m_pkthdr.csum_flags & 506 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | 507 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { 508 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: 509 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); 510 UDP6_STATINC(UDP6_STAT_BADSUM); 511 goto bad; 512 513 #if 0 /* notyet */ 514 case M_CSUM_UDPv6|M_CSUM_DATA: 515 #endif 516 517 case M_CSUM_UDPv6: 518 /* Checksum was okay. */ 519 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); 520 break; 521 522 default: 523 /* 524 * Need to compute it ourselves. Maybe skip checksum 525 * on loopback interfaces. 526 */ 527 UDP_CSUM_COUNTER_INCR(&udp6_swcsum); 528 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { 529 UDP6_STATINC(UDP6_STAT_BADSUM); 530 goto bad; 531 } 532 } 533 534 good: 535 return 0; 536 bad: 537 return -1; 538 } 539 540 int 541 udp6_input(struct mbuf **mp, int *offp, int proto) 542 { 543 struct mbuf *m = *mp; 544 int off = *offp; 545 struct sockaddr_in6 src, dst; 546 struct ip6_hdr *ip6; 547 struct udphdr *uh; 548 u_int32_t plen, ulen; 549 550 ip6 = mtod(m, struct ip6_hdr *); 551 552 #if defined(NFAITH) && 0 < NFAITH 553 if (faithprefix(&ip6->ip6_dst)) { 554 /* send icmp6 host unreach? */ 555 m_freem(m); 556 return IPPROTO_DONE; 557 } 558 #endif 559 560 UDP6_STATINC(UDP6_STAT_IPACKETS); 561 562 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ 563 plen = m->m_pkthdr.len - off; 564 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); 565 if (uh == NULL) { 566 IP6_STATINC(IP6_STAT_TOOSHORT); 567 return IPPROTO_DONE; 568 } 569 KASSERT(UDP_HDR_ALIGNED_P(uh)); 570 ulen = ntohs((u_short)uh->uh_ulen); 571 /* 572 * RFC2675 section 4: jumbograms will have 0 in the UDP header field, 573 * iff payload length > 0xffff. 574 */ 575 if (ulen == 0 && plen > 0xffff) 576 ulen = plen; 577 578 if (plen != ulen) { 579 UDP6_STATINC(UDP6_STAT_BADLEN); 580 goto bad; 581 } 582 583 /* destination port of 0 is illegal, based on RFC768. */ 584 if (uh->uh_dport == 0) 585 goto bad; 586 587 /* Be proactive about malicious use of IPv4 mapped address */ 588 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 589 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 590 /* XXX stat */ 591 goto bad; 592 } 593 594 /* 595 * Checksum extended UDP header and data. Maybe skip checksum 596 * on loopback interfaces. 597 */ 598 if (udp6_input_checksum(m, uh, off, ulen)) 599 goto bad; 600 601 /* 602 * Construct source and dst sockaddrs. 603 */ 604 memset(&src, 0, sizeof(src)); 605 src.sin6_family = AF_INET6; 606 src.sin6_len = sizeof(struct sockaddr_in6); 607 src.sin6_addr = ip6->ip6_src; 608 src.sin6_port = uh->uh_sport; 609 memset(&dst, 0, sizeof(dst)); 610 dst.sin6_family = AF_INET6; 611 dst.sin6_len = sizeof(struct sockaddr_in6); 612 dst.sin6_addr = ip6->ip6_dst; 613 dst.sin6_port = uh->uh_dport; 614 615 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { 616 if (m->m_flags & M_MCAST) { 617 UDP6_STATINC(UDP6_STAT_NOPORTMCAST); 618 goto bad; 619 } 620 UDP6_STATINC(UDP6_STAT_NOPORT); 621 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 622 m = NULL; 623 } 624 625 bad: 626 if (m) 627 m_freem(m); 628 return IPPROTO_DONE; 629 } 630 #endif 631 632 #ifdef INET 633 static void 634 udp4_sendup(struct mbuf *m, int off /* offset of data portion */, 635 struct sockaddr *src, struct socket *so) 636 { 637 struct mbuf *opts = NULL; 638 struct mbuf *n; 639 struct inpcb *inp = NULL; 640 641 if (!so) 642 return; 643 switch (so->so_proto->pr_domain->dom_family) { 644 case AF_INET: 645 inp = sotoinpcb(so); 646 break; 647 #ifdef INET6 648 case AF_INET6: 649 break; 650 #endif 651 default: 652 return; 653 } 654 655 #if defined(IPSEC) 656 /* check AH/ESP integrity. */ 657 if (so != NULL && ipsec4_in_reject_so(m, so)) { 658 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 659 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 660 icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, 661 0, 0); 662 return; 663 } 664 #endif /*IPSEC*/ 665 666 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 667 if (inp && (inp->inp_flags & INP_CONTROLOPTS 668 #ifdef SO_OTIMESTAMP 669 || so->so_options & SO_OTIMESTAMP 670 #endif 671 || so->so_options & SO_TIMESTAMP)) { 672 struct ip *ip = mtod(n, struct ip *); 673 ip_savecontrol(inp, &opts, ip, n); 674 } 675 676 m_adj(n, off); 677 if (sbappendaddr(&so->so_rcv, src, n, 678 opts) == 0) { 679 m_freem(n); 680 if (opts) 681 m_freem(opts); 682 so->so_rcv.sb_overflowed++; 683 UDP_STATINC(UDP_STAT_FULLSOCK); 684 } else 685 sorwakeup(so); 686 } 687 } 688 #endif 689 690 #ifdef INET6 691 static void 692 udp6_sendup(struct mbuf *m, int off /* offset of data portion */, 693 struct sockaddr *src, struct socket *so) 694 { 695 struct mbuf *opts = NULL; 696 struct mbuf *n; 697 struct in6pcb *in6p = NULL; 698 699 if (!so) 700 return; 701 if (so->so_proto->pr_domain->dom_family != AF_INET6) 702 return; 703 in6p = sotoin6pcb(so); 704 705 #if defined(IPSEC) 706 /* check AH/ESP integrity. */ 707 if (so != NULL && ipsec6_in_reject_so(m, so)) { 708 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 709 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) 710 icmp6_error(n, ICMP6_DST_UNREACH, 711 ICMP6_DST_UNREACH_ADMIN, 0); 712 return; 713 } 714 #endif /*IPSEC*/ 715 716 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 717 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS 718 #ifdef SO_OTIMESTAMP 719 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 720 #endif 721 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { 722 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); 723 ip6_savecontrol(in6p, &opts, ip6, n); 724 } 725 726 m_adj(n, off); 727 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { 728 m_freem(n); 729 if (opts) 730 m_freem(opts); 731 so->so_rcv.sb_overflowed++; 732 UDP6_STATINC(UDP6_STAT_FULLSOCK); 733 } else 734 sorwakeup(so); 735 } 736 } 737 #endif 738 739 #ifdef INET 740 static int 741 udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, 742 struct mbuf **mp, int off /* offset of udphdr */) 743 { 744 u_int16_t *sport, *dport; 745 int rcvcnt; 746 struct in_addr *src4, *dst4; 747 struct inpcb_hdr *inph; 748 struct inpcb *inp; 749 struct mbuf *m = *mp; 750 751 rcvcnt = 0; 752 off += sizeof(struct udphdr); /* now, offset of payload */ 753 754 if (src->sin_family != AF_INET || dst->sin_family != AF_INET) 755 goto bad; 756 757 src4 = &src->sin_addr; 758 sport = &src->sin_port; 759 dst4 = &dst->sin_addr; 760 dport = &dst->sin_port; 761 762 if (IN_MULTICAST(dst4->s_addr) || 763 in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 764 /* 765 * Deliver a multicast or broadcast datagram to *all* sockets 766 * for which the local and remote addresses and ports match 767 * those of the incoming datagram. This allows more than 768 * one process to receive multi/broadcasts on the same port. 769 * (This really ought to be done for unicast datagrams as 770 * well, but that would cause problems with existing 771 * applications that open both address-specific sockets and 772 * a wildcard socket listening to the same port -- they would 773 * end up receiving duplicates of every unicast datagram. 774 * Those applications open the multiple sockets to overcome an 775 * inadequacy of the UDP socket interface, but for backwards 776 * compatibility we avoid the problem here rather than 777 * fixing the interface. Maybe 4.5BSD will remedy this?) 778 */ 779 780 /* 781 * KAME note: traditionally we dropped udpiphdr from mbuf here. 782 * we need udpiphdr for IPsec processing so we do that later. 783 */ 784 /* 785 * Locate pcb(s) for datagram. 786 */ 787 TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 788 inp = (struct inpcb *)inph; 789 if (inp->inp_af != AF_INET) 790 continue; 791 792 if (inp->inp_lport != *dport) 793 continue; 794 if (!in_nullhost(inp->inp_laddr)) { 795 if (!in_hosteq(inp->inp_laddr, *dst4)) 796 continue; 797 } 798 if (!in_nullhost(inp->inp_faddr)) { 799 if (!in_hosteq(inp->inp_faddr, *src4) || 800 inp->inp_fport != *sport) 801 continue; 802 } 803 804 udp4_sendup(m, off, (struct sockaddr *)src, 805 inp->inp_socket); 806 rcvcnt++; 807 808 /* 809 * Don't look for additional matches if this one does 810 * not have either the SO_REUSEPORT or SO_REUSEADDR 811 * socket options set. This heuristic avoids searching 812 * through all pcbs in the common case of a non-shared 813 * port. It assumes that an application will never 814 * clear these options after setting them. 815 */ 816 if ((inp->inp_socket->so_options & 817 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 818 break; 819 } 820 } else { 821 /* 822 * Locate pcb for datagram. 823 */ 824 inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, 825 *dport, 0); 826 if (inp == 0) { 827 UDP_STATINC(UDP_STAT_PCBHASHMISS); 828 inp = in_pcblookup_bind(&udbtable, *dst4, *dport); 829 if (inp == 0) 830 return rcvcnt; 831 } 832 833 #ifdef IPSEC 834 /* Handle ESP over UDP */ 835 if (inp->inp_flags & INP_ESPINUDP_ALL) { 836 struct sockaddr *sa = (struct sockaddr *)src; 837 838 switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { 839 case -1: /* Error, m was freeed */ 840 rcvcnt = -1; 841 goto bad; 842 break; 843 844 case 1: /* ESP over UDP */ 845 rcvcnt++; 846 goto bad; 847 break; 848 849 case 0: /* plain UDP */ 850 default: /* Unexpected */ 851 /* 852 * Normal UDP processing will take place 853 * m may have changed. 854 */ 855 m = *mp; 856 break; 857 } 858 } 859 #endif 860 861 /* 862 * Check the minimum TTL for socket. 863 */ 864 if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl) 865 goto bad; 866 867 udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); 868 rcvcnt++; 869 } 870 871 bad: 872 return rcvcnt; 873 } 874 #endif 875 876 #ifdef INET6 877 static int 878 udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, 879 struct mbuf *m, int off) 880 { 881 u_int16_t sport, dport; 882 int rcvcnt; 883 struct in6_addr src6, *dst6; 884 const struct in_addr *dst4; 885 struct inpcb_hdr *inph; 886 struct in6pcb *in6p; 887 888 rcvcnt = 0; 889 off += sizeof(struct udphdr); /* now, offset of payload */ 890 891 if (af != AF_INET && af != AF_INET6) 892 goto bad; 893 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) 894 goto bad; 895 896 src6 = src->sin6_addr; 897 if (sa6_recoverscope(src) != 0) { 898 /* XXX: should be impossible. */ 899 goto bad; 900 } 901 sport = src->sin6_port; 902 903 dport = dst->sin6_port; 904 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; 905 dst6 = &dst->sin6_addr; 906 907 if (IN6_IS_ADDR_MULTICAST(dst6) || 908 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { 909 /* 910 * Deliver a multicast or broadcast datagram to *all* sockets 911 * for which the local and remote addresses and ports match 912 * those of the incoming datagram. This allows more than 913 * one process to receive multi/broadcasts on the same port. 914 * (This really ought to be done for unicast datagrams as 915 * well, but that would cause problems with existing 916 * applications that open both address-specific sockets and 917 * a wildcard socket listening to the same port -- they would 918 * end up receiving duplicates of every unicast datagram. 919 * Those applications open the multiple sockets to overcome an 920 * inadequacy of the UDP socket interface, but for backwards 921 * compatibility we avoid the problem here rather than 922 * fixing the interface. Maybe 4.5BSD will remedy this?) 923 */ 924 925 /* 926 * KAME note: traditionally we dropped udpiphdr from mbuf here. 927 * we need udpiphdr for IPsec processing so we do that later. 928 */ 929 /* 930 * Locate pcb(s) for datagram. 931 */ 932 TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { 933 in6p = (struct in6pcb *)inph; 934 if (in6p->in6p_af != AF_INET6) 935 continue; 936 937 if (in6p->in6p_lport != dport) 938 continue; 939 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 940 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 941 dst6)) 942 continue; 943 } else { 944 if (IN6_IS_ADDR_V4MAPPED(dst6) && 945 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 946 continue; 947 } 948 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 949 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 950 &src6) || in6p->in6p_fport != sport) 951 continue; 952 } else { 953 if (IN6_IS_ADDR_V4MAPPED(&src6) && 954 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 955 continue; 956 } 957 958 udp6_sendup(m, off, (struct sockaddr *)src, 959 in6p->in6p_socket); 960 rcvcnt++; 961 962 /* 963 * Don't look for additional matches if this one does 964 * not have either the SO_REUSEPORT or SO_REUSEADDR 965 * socket options set. This heuristic avoids searching 966 * through all pcbs in the common case of a non-shared 967 * port. It assumes that an application will never 968 * clear these options after setting them. 969 */ 970 if ((in6p->in6p_socket->so_options & 971 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 972 break; 973 } 974 } else { 975 /* 976 * Locate pcb for datagram. 977 */ 978 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6, 979 dport, 0, 0); 980 if (in6p == 0) { 981 UDP_STATINC(UDP_STAT_PCBHASHMISS); 982 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0); 983 if (in6p == 0) 984 return rcvcnt; 985 } 986 987 udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); 988 rcvcnt++; 989 } 990 991 bad: 992 return rcvcnt; 993 } 994 #endif 995 996 #ifdef INET 997 /* 998 * Notify a udp user of an asynchronous error; 999 * just wake up so that he can collect error status. 1000 */ 1001 static void 1002 udp_notify(struct inpcb *inp, int errno) 1003 { 1004 inp->inp_socket->so_error = errno; 1005 sorwakeup(inp->inp_socket); 1006 sowwakeup(inp->inp_socket); 1007 } 1008 1009 void * 1010 udp_ctlinput(int cmd, const struct sockaddr *sa, void *v) 1011 { 1012 struct ip *ip = v; 1013 struct udphdr *uh; 1014 void (*notify)(struct inpcb *, int) = udp_notify; 1015 int errno; 1016 1017 if (sa->sa_family != AF_INET 1018 || sa->sa_len != sizeof(struct sockaddr_in)) 1019 return NULL; 1020 if ((unsigned)cmd >= PRC_NCMDS) 1021 return NULL; 1022 errno = inetctlerrmap[cmd]; 1023 if (PRC_IS_REDIRECT(cmd)) 1024 notify = in_rtchange, ip = 0; 1025 else if (cmd == PRC_HOSTDEAD) 1026 ip = 0; 1027 else if (errno == 0) 1028 return NULL; 1029 if (ip) { 1030 uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2)); 1031 in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport, 1032 ip->ip_src, uh->uh_sport, errno, notify); 1033 1034 /* XXX mapped address case */ 1035 } else 1036 in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno, 1037 notify); 1038 return NULL; 1039 } 1040 1041 int 1042 udp_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1043 { 1044 int s; 1045 int error = 0; 1046 struct inpcb *inp; 1047 int family; 1048 int optval; 1049 1050 family = so->so_proto->pr_domain->dom_family; 1051 1052 s = splsoftnet(); 1053 switch (family) { 1054 #ifdef INET 1055 case PF_INET: 1056 if (sopt->sopt_level != IPPROTO_UDP) { 1057 error = ip_ctloutput(op, so, sopt); 1058 goto end; 1059 } 1060 break; 1061 #endif 1062 #ifdef INET6 1063 case PF_INET6: 1064 if (sopt->sopt_level != IPPROTO_UDP) { 1065 error = ip6_ctloutput(op, so, sopt); 1066 goto end; 1067 } 1068 break; 1069 #endif 1070 default: 1071 error = EAFNOSUPPORT; 1072 goto end; 1073 } 1074 1075 1076 switch (op) { 1077 case PRCO_SETOPT: 1078 inp = sotoinpcb(so); 1079 1080 switch (sopt->sopt_name) { 1081 case UDP_ENCAP: 1082 error = sockopt_getint(sopt, &optval); 1083 if (error) 1084 break; 1085 1086 switch(optval) { 1087 case 0: 1088 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1089 break; 1090 1091 case UDP_ENCAP_ESPINUDP: 1092 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1093 inp->inp_flags |= INP_ESPINUDP; 1094 break; 1095 1096 case UDP_ENCAP_ESPINUDP_NON_IKE: 1097 inp->inp_flags &= ~INP_ESPINUDP_ALL; 1098 inp->inp_flags |= INP_ESPINUDP_NON_IKE; 1099 break; 1100 default: 1101 error = EINVAL; 1102 break; 1103 } 1104 break; 1105 1106 default: 1107 error = ENOPROTOOPT; 1108 break; 1109 } 1110 break; 1111 1112 default: 1113 error = EINVAL; 1114 break; 1115 } 1116 1117 end: 1118 splx(s); 1119 return error; 1120 } 1121 1122 1123 int 1124 udp_output(struct mbuf *m, ...) 1125 { 1126 struct inpcb *inp; 1127 struct udpiphdr *ui; 1128 struct route *ro; 1129 int len = m->m_pkthdr.len; 1130 int error = 0; 1131 va_list ap; 1132 1133 MCLAIM(m, &udp_tx_mowner); 1134 va_start(ap, m); 1135 inp = va_arg(ap, struct inpcb *); 1136 va_end(ap); 1137 1138 /* 1139 * Calculate data length and get a mbuf 1140 * for UDP and IP headers. 1141 */ 1142 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 1143 if (m == 0) { 1144 error = ENOBUFS; 1145 goto release; 1146 } 1147 1148 /* 1149 * Compute the packet length of the IP header, and 1150 * punt if the length looks bogus. 1151 */ 1152 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1153 error = EMSGSIZE; 1154 goto release; 1155 } 1156 1157 /* 1158 * Fill in mbuf with extended UDP header 1159 * and addresses and length put into network format. 1160 */ 1161 ui = mtod(m, struct udpiphdr *); 1162 ui->ui_pr = IPPROTO_UDP; 1163 ui->ui_src = inp->inp_laddr; 1164 ui->ui_dst = inp->inp_faddr; 1165 ui->ui_sport = inp->inp_lport; 1166 ui->ui_dport = inp->inp_fport; 1167 ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); 1168 1169 ro = &inp->inp_route; 1170 1171 /* 1172 * Set up checksum and output datagram. 1173 */ 1174 if (udpcksum) { 1175 /* 1176 * XXX Cache pseudo-header checksum part for 1177 * XXX "connected" UDP sockets. 1178 */ 1179 ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, 1180 ui->ui_dst.s_addr, htons((u_int16_t)len + 1181 sizeof(struct udphdr) + IPPROTO_UDP)); 1182 m->m_pkthdr.csum_flags = M_CSUM_UDPv4; 1183 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1184 } else 1185 ui->ui_sum = 0; 1186 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1187 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ 1188 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ 1189 UDP_STATINC(UDP_STAT_OPACKETS); 1190 1191 return (ip_output(m, inp->inp_options, ro, 1192 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 1193 inp->inp_moptions, inp->inp_socket)); 1194 1195 release: 1196 m_freem(m); 1197 return (error); 1198 } 1199 1200 static int 1201 udp_attach(struct socket *so, int proto) 1202 { 1203 struct inpcb *inp; 1204 int error; 1205 1206 KASSERT(sotoinpcb(so) == NULL); 1207 1208 /* Assign the lock (must happen even if we will error out). */ 1209 sosetlock(so); 1210 1211 #ifdef MBUFTRACE 1212 so->so_mowner = &udp_mowner; 1213 so->so_rcv.sb_mowner = &udp_rx_mowner; 1214 so->so_snd.sb_mowner = &udp_tx_mowner; 1215 #endif 1216 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1217 error = soreserve(so, udp_sendspace, udp_recvspace); 1218 if (error) { 1219 return error; 1220 } 1221 } 1222 1223 error = in_pcballoc(so, &udbtable); 1224 if (error) { 1225 return error; 1226 } 1227 inp = sotoinpcb(so); 1228 inp->inp_ip.ip_ttl = ip_defttl; 1229 KASSERT(solocked(so)); 1230 1231 return error; 1232 } 1233 1234 static void 1235 udp_detach(struct socket *so) 1236 { 1237 struct inpcb *inp; 1238 1239 KASSERT(solocked(so)); 1240 inp = sotoinpcb(so); 1241 KASSERT(inp != NULL); 1242 in_pcbdetach(inp); 1243 } 1244 1245 static int 1246 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 1247 struct mbuf *control, struct lwp *l) 1248 { 1249 struct inpcb *inp; 1250 int s, error = 0; 1251 1252 KASSERT(req != PRU_ATTACH); 1253 KASSERT(req != PRU_DETACH); 1254 1255 if (req == PRU_CONTROL) { 1256 return in_control(so, (long)m, (void *)nam, 1257 (struct ifnet *)control, l); 1258 } 1259 s = splsoftnet(); 1260 if (req == PRU_PURGEIF) { 1261 mutex_enter(softnet_lock); 1262 in_pcbpurgeif0(&udbtable, (struct ifnet *)control); 1263 in_purgeif((struct ifnet *)control); 1264 in_pcbpurgeif(&udbtable, (struct ifnet *)control); 1265 mutex_exit(softnet_lock); 1266 splx(s); 1267 return 0; 1268 } 1269 1270 KASSERT(solocked(so)); 1271 inp = sotoinpcb(so); 1272 1273 KASSERT(!control || (req == PRU_SEND || req == PRU_SENDOOB)); 1274 if (inp == NULL) { 1275 splx(s); 1276 return EINVAL; 1277 } 1278 1279 /* 1280 * Note: need to block udp_input while changing 1281 * the udp pcb queue and/or pcb addresses. 1282 */ 1283 switch (req) { 1284 case PRU_BIND: 1285 error = in_pcbbind(inp, nam, l); 1286 break; 1287 1288 case PRU_LISTEN: 1289 error = EOPNOTSUPP; 1290 break; 1291 1292 case PRU_CONNECT: 1293 error = in_pcbconnect(inp, nam, l); 1294 if (error) 1295 break; 1296 soisconnected(so); 1297 break; 1298 1299 case PRU_CONNECT2: 1300 error = EOPNOTSUPP; 1301 break; 1302 1303 case PRU_DISCONNECT: 1304 /*soisdisconnected(so);*/ 1305 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1306 in_pcbdisconnect(inp); 1307 inp->inp_laddr = zeroin_addr; /* XXX */ 1308 in_pcbstate(inp, INP_BOUND); /* XXX */ 1309 break; 1310 1311 case PRU_SHUTDOWN: 1312 socantsendmore(so); 1313 break; 1314 1315 case PRU_RCVD: 1316 error = EOPNOTSUPP; 1317 break; 1318 1319 case PRU_SEND: 1320 if (control && control->m_len) { 1321 m_freem(control); 1322 m_freem(m); 1323 error = EINVAL; 1324 break; 1325 } 1326 { 1327 struct in_addr laddr; /* XXX */ 1328 1329 memset(&laddr, 0, sizeof laddr); 1330 if (nam) { 1331 laddr = inp->inp_laddr; /* XXX */ 1332 if ((so->so_state & SS_ISCONNECTED) != 0) { 1333 error = EISCONN; 1334 goto die; 1335 } 1336 error = in_pcbconnect(inp, nam, l); 1337 if (error) 1338 goto die; 1339 } else { 1340 if ((so->so_state & SS_ISCONNECTED) == 0) { 1341 error = ENOTCONN; 1342 goto die; 1343 } 1344 } 1345 error = udp_output(m, inp); 1346 m = NULL; 1347 if (nam) { 1348 in_pcbdisconnect(inp); 1349 inp->inp_laddr = laddr; /* XXX */ 1350 in_pcbstate(inp, INP_BOUND); /* XXX */ 1351 } 1352 die: 1353 if (m) 1354 m_freem(m); 1355 } 1356 break; 1357 1358 case PRU_SENSE: 1359 /* 1360 * stat: don't bother with a blocksize. 1361 */ 1362 splx(s); 1363 return (0); 1364 1365 case PRU_RCVOOB: 1366 error = EOPNOTSUPP; 1367 break; 1368 1369 case PRU_SENDOOB: 1370 m_freem(control); 1371 m_freem(m); 1372 error = EOPNOTSUPP; 1373 break; 1374 1375 case PRU_SOCKADDR: 1376 in_setsockaddr(inp, nam); 1377 break; 1378 1379 case PRU_PEERADDR: 1380 in_setpeeraddr(inp, nam); 1381 break; 1382 1383 default: 1384 panic("udp_usrreq"); 1385 } 1386 splx(s); 1387 1388 return error; 1389 } 1390 1391 static int 1392 sysctl_net_inet_udp_stats(SYSCTLFN_ARGS) 1393 { 1394 1395 return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS)); 1396 } 1397 1398 /* 1399 * Sysctl for udp variables. 1400 */ 1401 static void 1402 sysctl_net_inet_udp_setup(struct sysctllog **clog) 1403 { 1404 1405 sysctl_createv(clog, 0, NULL, NULL, 1406 CTLFLAG_PERMANENT, 1407 CTLTYPE_NODE, "inet", NULL, 1408 NULL, 0, NULL, 0, 1409 CTL_NET, PF_INET, CTL_EOL); 1410 sysctl_createv(clog, 0, NULL, NULL, 1411 CTLFLAG_PERMANENT, 1412 CTLTYPE_NODE, "udp", 1413 SYSCTL_DESCR("UDPv4 related settings"), 1414 NULL, 0, NULL, 0, 1415 CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); 1416 1417 sysctl_createv(clog, 0, NULL, NULL, 1418 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1419 CTLTYPE_INT, "checksum", 1420 SYSCTL_DESCR("Compute UDP checksums"), 1421 NULL, 0, &udpcksum, 0, 1422 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, 1423 CTL_EOL); 1424 sysctl_createv(clog, 0, NULL, NULL, 1425 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1426 CTLTYPE_INT, "sendspace", 1427 SYSCTL_DESCR("Default UDP send buffer size"), 1428 NULL, 0, &udp_sendspace, 0, 1429 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, 1430 CTL_EOL); 1431 sysctl_createv(clog, 0, NULL, NULL, 1432 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1433 CTLTYPE_INT, "recvspace", 1434 SYSCTL_DESCR("Default UDP receive buffer size"), 1435 NULL, 0, &udp_recvspace, 0, 1436 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, 1437 CTL_EOL); 1438 sysctl_createv(clog, 0, NULL, NULL, 1439 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1440 CTLTYPE_INT, "do_loopback_cksum", 1441 SYSCTL_DESCR("Perform UDP checksum on loopback"), 1442 NULL, 0, &udp_do_loopback_cksum, 0, 1443 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, 1444 CTL_EOL); 1445 sysctl_createv(clog, 0, NULL, NULL, 1446 CTLFLAG_PERMANENT, 1447 CTLTYPE_STRUCT, "pcblist", 1448 SYSCTL_DESCR("UDP protocol control block list"), 1449 sysctl_inpcblist, 0, &udbtable, 0, 1450 CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, 1451 CTL_EOL); 1452 sysctl_createv(clog, 0, NULL, NULL, 1453 CTLFLAG_PERMANENT, 1454 CTLTYPE_STRUCT, "stats", 1455 SYSCTL_DESCR("UDP statistics"), 1456 sysctl_net_inet_udp_stats, 0, NULL, 0, 1457 CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, 1458 CTL_EOL); 1459 } 1460 #endif 1461 1462 void 1463 udp_statinc(u_int stat) 1464 { 1465 1466 KASSERT(stat < UDP_NSTATS); 1467 UDP_STATINC(stat); 1468 } 1469 1470 #if defined(INET) && defined(IPSEC) 1471 /* 1472 * Returns: 1473 * 1 if the packet was processed 1474 * 0 if normal UDP processing should take place 1475 * -1 if an error occurent and m was freed 1476 */ 1477 static int 1478 udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src, 1479 struct socket *so) 1480 { 1481 size_t len; 1482 void *data; 1483 struct inpcb *inp; 1484 size_t skip = 0; 1485 size_t minlen; 1486 size_t iphdrlen; 1487 struct ip *ip; 1488 struct m_tag *tag; 1489 struct udphdr *udphdr; 1490 u_int16_t sport, dport; 1491 struct mbuf *m = *mp; 1492 1493 /* 1494 * Collapse the mbuf chain if the first mbuf is too short 1495 * The longest case is: UDP + non ESP marker + ESP 1496 */ 1497 minlen = off + sizeof(u_int64_t) + sizeof(struct esp); 1498 if (minlen > m->m_pkthdr.len) 1499 minlen = m->m_pkthdr.len; 1500 1501 if (m->m_len < minlen) { 1502 if ((*mp = m_pullup(m, minlen)) == NULL) { 1503 printf("udp4_espinudp: m_pullup failed\n"); 1504 return -1; 1505 } 1506 m = *mp; 1507 } 1508 1509 len = m->m_len - off; 1510 data = mtod(m, char *) + off; 1511 inp = sotoinpcb(so); 1512 1513 /* Ignore keepalive packets */ 1514 if ((len == 1) && (*(unsigned char *)data == 0xff)) { 1515 m_free(m); 1516 *mp = NULL; /* avoid any further processiong by caller ... */ 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 * We have modified the packet - it is now ESP, so we should not 1577 * return to UDP processing ... 1578 * 1579 * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1580 * the source UDP port. This is required if we want 1581 * to select the right SPD for multiple hosts behind 1582 * same NAT 1583 */ 1584 if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1585 sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { 1586 printf("udp4_espinudp: m_tag_get failed\n"); 1587 m_freem(m); 1588 return -1; 1589 } 1590 ((u_int16_t *)(tag + 1))[0] = sport; 1591 ((u_int16_t *)(tag + 1))[1] = dport; 1592 m_tag_prepend(m, tag); 1593 1594 #ifdef IPSEC 1595 ipsec4_common_input(m, iphdrlen, IPPROTO_ESP); 1596 #else 1597 esp4_input(m, iphdrlen); 1598 #endif 1599 1600 /* We handled it, it shouldn't be handled by UDP */ 1601 *mp = NULL; /* avoid free by caller ... */ 1602 return 1; 1603 } 1604 #endif 1605 1606 PR_WRAP_USRREQ(udp_usrreq) 1607 1608 #define udp_usrreq udp_usrreq_wrapper 1609 1610 const struct pr_usrreqs udp_usrreqs = { 1611 .pr_attach = udp_attach, 1612 .pr_detach = udp_detach, 1613 .pr_generic = udp_usrreq, 1614 }; 1615
Indexes created Sun Sep 21 20:09:37 GMT 2025