| 1 | /* $NetBSD: udp_usrreq.c,v 1.229 2016/11/18 06:50:04 knakahara 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 | /* |
| 64 | * UDP protocol implementation. |
| 65 | * Per RFC 768, August, 1980. |
| 66 | */ |
| 67 | |
| 68 | #include <sys/cdefs.h> |
| 69 | __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.229 2016/11/18 06:50:04 knakahara Exp $" ); |
| 70 | |
| 71 | #ifdef _KERNEL_OPT |
| 72 | #include "opt_inet.h" |
| 73 | #include "opt_compat_netbsd.h" |
| 74 | #include "opt_ipsec.h" |
| 75 | #include "opt_inet_csum.h" |
| 76 | #include "opt_ipkdb.h" |
| 77 | #include "opt_mbuftrace.h" |
| 78 | #include "opt_net_mpsafe.h" |
| 79 | #endif |
| 80 | |
| 81 | #include <sys/param.h> |
| 82 | #include <sys/mbuf.h> |
| 83 | #include <sys/once.h> |
| 84 | #include <sys/protosw.h> |
| 85 | #include <sys/socket.h> |
| 86 | #include <sys/socketvar.h> |
| 87 | #include <sys/systm.h> |
| 88 | #include <sys/proc.h> |
| 89 | #include <sys/domain.h> |
| 90 | #include <sys/sysctl.h> |
| 91 | |
| 92 | #include <net/if.h> |
| 93 | |
| 94 | #include <netinet/in.h> |
| 95 | #include <netinet/in_systm.h> |
| 96 | #include <netinet/in_var.h> |
| 97 | #include <netinet/ip.h> |
| 98 | #include <netinet/in_pcb.h> |
| 99 | #include <netinet/ip_var.h> |
| 100 | #include <netinet/ip_icmp.h> |
| 101 | #include <netinet/udp.h> |
| 102 | #include <netinet/udp_var.h> |
| 103 | #include <netinet/udp_private.h> |
| 104 | |
| 105 | #ifdef INET6 |
| 106 | #include <netinet/ip6.h> |
| 107 | #include <netinet/icmp6.h> |
| 108 | #include <netinet6/ip6_var.h> |
| 109 | #include <netinet6/ip6_private.h> |
| 110 | #include <netinet6/in6_pcb.h> |
| 111 | #include <netinet6/udp6_var.h> |
| 112 | #include <netinet6/udp6_private.h> |
| 113 | #endif |
| 114 | |
| 115 | #ifndef INET6 |
| 116 | /* always need ip6.h for IP6_EXTHDR_GET */ |
| 117 | #include <netinet/ip6.h> |
| 118 | #endif |
| 119 | |
| 120 | #ifdef IPSEC |
| 121 | #include <netipsec/ipsec.h> |
| 122 | #include <netipsec/ipsec_var.h> |
| 123 | #include <netipsec/ipsec_private.h> |
| 124 | #include <netipsec/esp.h> |
| 125 | #ifdef INET6 |
| 126 | #include <netipsec/ipsec6.h> |
| 127 | #endif |
| 128 | #endif /* IPSEC */ |
| 129 | |
| 130 | #ifdef COMPAT_50 |
| 131 | #include <compat/sys/socket.h> |
| 132 | #endif |
| 133 | |
| 134 | #ifdef IPKDB |
| 135 | #include <ipkdb/ipkdb.h> |
| 136 | #endif |
| 137 | |
| 138 | int udpcksum = 1; |
| 139 | int udp_do_loopback_cksum = 0; |
| 140 | |
| 141 | struct inpcbtable udbtable; |
| 142 | |
| 143 | percpu_t *udpstat_percpu; |
| 144 | |
| 145 | #ifdef INET |
| 146 | #ifdef IPSEC |
| 147 | static int udp4_espinudp (struct mbuf **, int, struct sockaddr *, |
| 148 | struct socket *); |
| 149 | #endif |
| 150 | static void udp4_sendup (struct mbuf *, int, struct sockaddr *, |
| 151 | struct socket *); |
| 152 | static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, |
| 153 | struct mbuf **, int); |
| 154 | static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); |
| 155 | #endif |
| 156 | #ifdef INET |
| 157 | static void udp_notify (struct inpcb *, int); |
| 158 | #endif |
| 159 | |
| 160 | #ifndef UDBHASHSIZE |
| 161 | #define UDBHASHSIZE 128 |
| 162 | #endif |
| 163 | int udbhashsize = UDBHASHSIZE; |
| 164 | |
| 165 | /* |
| 166 | * For send - really max datagram size; for receive - 40 1K datagrams. |
| 167 | */ |
| 168 | static int udp_sendspace = 9216; |
| 169 | static int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); |
| 170 | |
| 171 | #ifdef MBUFTRACE |
| 172 | struct mowner udp_mowner = MOWNER_INIT("udp" , "" ); |
| 173 | struct mowner udp_rx_mowner = MOWNER_INIT("udp" , "rx" ); |
| 174 | struct mowner udp_tx_mowner = MOWNER_INIT("udp" , "tx" ); |
| 175 | #endif |
| 176 | |
| 177 | #ifdef UDP_CSUM_COUNTERS |
| 178 | #include <sys/device.h> |
| 179 | |
| 180 | #if defined(INET) |
| 181 | struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 182 | NULL, "udp" , "hwcsum bad" ); |
| 183 | struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 184 | NULL, "udp" , "hwcsum ok" ); |
| 185 | struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 186 | NULL, "udp" , "hwcsum data" ); |
| 187 | struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 188 | NULL, "udp" , "swcsum" ); |
| 189 | |
| 190 | EVCNT_ATTACH_STATIC(udp_hwcsum_bad); |
| 191 | EVCNT_ATTACH_STATIC(udp_hwcsum_ok); |
| 192 | EVCNT_ATTACH_STATIC(udp_hwcsum_data); |
| 193 | EVCNT_ATTACH_STATIC(udp_swcsum); |
| 194 | #endif /* defined(INET) */ |
| 195 | |
| 196 | #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ |
| 197 | #else |
| 198 | #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ |
| 199 | #endif /* UDP_CSUM_COUNTERS */ |
| 200 | |
| 201 | static void sysctl_net_inet_udp_setup(struct sysctllog **); |
| 202 | |
| 203 | static int |
| 204 | do_udpinit(void) |
| 205 | { |
| 206 | |
| 207 | in_pcbinit(&udbtable, udbhashsize, udbhashsize); |
| 208 | udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS); |
| 209 | |
| 210 | MOWNER_ATTACH(&udp_tx_mowner); |
| 211 | MOWNER_ATTACH(&udp_rx_mowner); |
| 212 | MOWNER_ATTACH(&udp_mowner); |
| 213 | |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | void |
| 218 | udp_init_common(void) |
| 219 | { |
| 220 | static ONCE_DECL(doudpinit); |
| 221 | |
| 222 | RUN_ONCE(&doudpinit, do_udpinit); |
| 223 | } |
| 224 | |
| 225 | void |
| 226 | udp_init(void) |
| 227 | { |
| 228 | |
| 229 | sysctl_net_inet_udp_setup(NULL); |
| 230 | |
| 231 | udp_init_common(); |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Checksum extended UDP header and data. |
| 236 | */ |
| 237 | |
| 238 | int |
| 239 | udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, |
| 240 | int iphlen, int len) |
| 241 | { |
| 242 | |
| 243 | switch (af) { |
| 244 | #ifdef INET |
| 245 | case AF_INET: |
| 246 | return udp4_input_checksum(m, uh, iphlen, len); |
| 247 | #endif |
| 248 | #ifdef INET6 |
| 249 | case AF_INET6: |
| 250 | return udp6_input_checksum(m, uh, iphlen, len); |
| 251 | #endif |
| 252 | } |
| 253 | #ifdef DIAGNOSTIC |
| 254 | panic("udp_input_checksum: unknown af %d" , af); |
| 255 | #endif |
| 256 | /* NOTREACHED */ |
| 257 | return -1; |
| 258 | } |
| 259 | |
| 260 | #ifdef INET |
| 261 | |
| 262 | /* |
| 263 | * Checksum extended UDP header and data. |
| 264 | */ |
| 265 | |
| 266 | static int |
| 267 | udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, |
| 268 | int iphlen, int len) |
| 269 | { |
| 270 | |
| 271 | /* |
| 272 | * XXX it's better to record and check if this mbuf is |
| 273 | * already checked. |
| 274 | */ |
| 275 | |
| 276 | if (uh->uh_sum == 0) |
| 277 | return 0; |
| 278 | |
| 279 | switch (m->m_pkthdr.csum_flags & |
| 280 | ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_UDPv4) | |
| 281 | M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { |
| 282 | case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: |
| 283 | UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); |
| 284 | goto badcsum; |
| 285 | |
| 286 | case M_CSUM_UDPv4|M_CSUM_DATA: { |
| 287 | u_int32_t hw_csum = m->m_pkthdr.csum_data; |
| 288 | |
| 289 | UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); |
| 290 | if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) { |
| 291 | const struct ip *ip = |
| 292 | mtod(m, const struct ip *); |
| 293 | |
| 294 | hw_csum = in_cksum_phdr(ip->ip_src.s_addr, |
| 295 | ip->ip_dst.s_addr, |
| 296 | htons(hw_csum + len + IPPROTO_UDP)); |
| 297 | } |
| 298 | if ((hw_csum ^ 0xffff) != 0) |
| 299 | goto badcsum; |
| 300 | break; |
| 301 | } |
| 302 | |
| 303 | case M_CSUM_UDPv4: |
| 304 | /* Checksum was okay. */ |
| 305 | UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); |
| 306 | break; |
| 307 | |
| 308 | default: |
| 309 | /* |
| 310 | * Need to compute it ourselves. Maybe skip checksum |
| 311 | * on loopback interfaces. |
| 312 | */ |
| 313 | if (__predict_true(!(m_get_rcvif_NOMPSAFE(m)->if_flags & |
| 314 | IFF_LOOPBACK) || |
| 315 | udp_do_loopback_cksum)) { |
| 316 | UDP_CSUM_COUNTER_INCR(&udp_swcsum); |
| 317 | if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) |
| 318 | goto badcsum; |
| 319 | } |
| 320 | break; |
| 321 | } |
| 322 | |
| 323 | return 0; |
| 324 | |
| 325 | badcsum: |
| 326 | UDP_STATINC(UDP_STAT_BADSUM); |
| 327 | return -1; |
| 328 | } |
| 329 | |
| 330 | void |
| 331 | udp_input(struct mbuf *m, ...) |
| 332 | { |
| 333 | va_list ap; |
| 334 | struct sockaddr_in src, dst; |
| 335 | struct ip *ip; |
| 336 | struct udphdr *uh; |
| 337 | int iphlen; |
| 338 | int len; |
| 339 | int n; |
| 340 | u_int16_t ip_len; |
| 341 | |
| 342 | va_start(ap, m); |
| 343 | iphlen = va_arg(ap, int); |
| 344 | (void)va_arg(ap, int); /* ignore value, advance ap */ |
| 345 | va_end(ap); |
| 346 | |
| 347 | MCLAIM(m, &udp_rx_mowner); |
| 348 | UDP_STATINC(UDP_STAT_IPACKETS); |
| 349 | |
| 350 | /* |
| 351 | * Get IP and UDP header together in first mbuf. |
| 352 | */ |
| 353 | ip = mtod(m, struct ip *); |
| 354 | IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); |
| 355 | if (uh == NULL) { |
| 356 | UDP_STATINC(UDP_STAT_HDROPS); |
| 357 | return; |
| 358 | } |
| 359 | /* |
| 360 | * Enforce alignment requirements that are violated in |
| 361 | * some cases, see kern/50766 for details. |
| 362 | */ |
| 363 | if (UDP_HDR_ALIGNED_P(uh) == 0) { |
| 364 | m = m_copyup(m, iphlen + sizeof(struct udphdr), 0); |
| 365 | if (m == NULL) { |
| 366 | UDP_STATINC(UDP_STAT_HDROPS); |
| 367 | return; |
| 368 | } |
| 369 | ip = mtod(m, struct ip *); |
| 370 | uh = (struct udphdr *)(mtod(m, char *) + iphlen); |
| 371 | } |
| 372 | KASSERT(UDP_HDR_ALIGNED_P(uh)); |
| 373 | |
| 374 | /* destination port of 0 is illegal, based on RFC768. */ |
| 375 | if (uh->uh_dport == 0) |
| 376 | goto bad; |
| 377 | |
| 378 | /* |
| 379 | * Make mbuf data length reflect UDP length. |
| 380 | * If not enough data to reflect UDP length, drop. |
| 381 | */ |
| 382 | ip_len = ntohs(ip->ip_len); |
| 383 | len = ntohs((u_int16_t)uh->uh_ulen); |
| 384 | if (ip_len != iphlen + len) { |
| 385 | if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { |
| 386 | UDP_STATINC(UDP_STAT_BADLEN); |
| 387 | goto bad; |
| 388 | } |
| 389 | m_adj(m, iphlen + len - ip_len); |
| 390 | } |
| 391 | |
| 392 | /* |
| 393 | * Checksum extended UDP header and data. |
| 394 | */ |
| 395 | if (udp4_input_checksum(m, uh, iphlen, len)) |
| 396 | goto badcsum; |
| 397 | |
| 398 | /* construct source and dst sockaddrs. */ |
| 399 | sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport); |
| 400 | sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport); |
| 401 | |
| 402 | if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { |
| 403 | UDP_STATINC(UDP_STAT_HDROPS); |
| 404 | return; |
| 405 | } |
| 406 | if (m == NULL) { |
| 407 | /* |
| 408 | * packet has been processed by ESP stuff - |
| 409 | * e.g. dropped NAT-T-keep-alive-packet ... |
| 410 | */ |
| 411 | return; |
| 412 | } |
| 413 | ip = mtod(m, struct ip *); |
| 414 | #ifdef INET6 |
| 415 | if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { |
| 416 | struct sockaddr_in6 src6, dst6; |
| 417 | |
| 418 | memset(&src6, 0, sizeof(src6)); |
| 419 | src6.sin6_family = AF_INET6; |
| 420 | src6.sin6_len = sizeof(struct sockaddr_in6); |
| 421 | in6_in_2_v4mapin6(&ip->ip_src, &src6.sin6_addr); |
| 422 | src6.sin6_port = uh->uh_sport; |
| 423 | memset(&dst6, 0, sizeof(dst6)); |
| 424 | dst6.sin6_family = AF_INET6; |
| 425 | dst6.sin6_len = sizeof(struct sockaddr_in6); |
| 426 | in6_in_2_v4mapin6(&ip->ip_dst, &dst6.sin6_addr); |
| 427 | dst6.sin6_port = uh->uh_dport; |
| 428 | |
| 429 | n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); |
| 430 | } |
| 431 | #endif |
| 432 | |
| 433 | if (n == 0) { |
| 434 | if (m->m_flags & (M_BCAST | M_MCAST)) { |
| 435 | UDP_STATINC(UDP_STAT_NOPORTBCAST); |
| 436 | goto bad; |
| 437 | } |
| 438 | UDP_STATINC(UDP_STAT_NOPORT); |
| 439 | #ifdef IPKDB |
| 440 | if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, |
| 441 | m, iphlen + sizeof(struct udphdr), |
| 442 | m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { |
| 443 | /* |
| 444 | * It was a debugger connect packet, |
| 445 | * just drop it now |
| 446 | */ |
| 447 | goto bad; |
| 448 | } |
| 449 | #endif |
| 450 | icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); |
| 451 | m = NULL; |
| 452 | } |
| 453 | |
| 454 | bad: |
| 455 | if (m) |
| 456 | m_freem(m); |
| 457 | return; |
| 458 | |
| 459 | badcsum: |
| 460 | m_freem(m); |
| 461 | } |
| 462 | #endif |
| 463 | |
| 464 | #ifdef INET |
| 465 | static void |
| 466 | udp4_sendup(struct mbuf *m, int off /* offset of data portion */, |
| 467 | struct sockaddr *src, struct socket *so) |
| 468 | { |
| 469 | struct mbuf *opts = NULL; |
| 470 | struct mbuf *n; |
| 471 | struct inpcb *inp = NULL; |
| 472 | |
| 473 | if (!so) |
| 474 | return; |
| 475 | switch (so->so_proto->pr_domain->dom_family) { |
| 476 | case AF_INET: |
| 477 | inp = sotoinpcb(so); |
| 478 | break; |
| 479 | #ifdef INET6 |
| 480 | case AF_INET6: |
| 481 | break; |
| 482 | #endif |
| 483 | default: |
| 484 | return; |
| 485 | } |
| 486 | |
| 487 | #if defined(IPSEC) |
| 488 | /* check AH/ESP integrity. */ |
| 489 | if (ipsec_used && so != NULL && ipsec4_in_reject_so(m, so)) { |
| 490 | IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); |
| 491 | if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) |
| 492 | icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, |
| 493 | 0, 0); |
| 494 | return; |
| 495 | } |
| 496 | #endif /*IPSEC*/ |
| 497 | |
| 498 | if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { |
| 499 | if (inp && (inp->inp_flags & INP_CONTROLOPTS |
| 500 | #ifdef SO_OTIMESTAMP |
| 501 | || so->so_options & SO_OTIMESTAMP |
| 502 | #endif |
| 503 | || so->so_options & SO_TIMESTAMP)) { |
| 504 | struct ip *ip = mtod(n, struct ip *); |
| 505 | ip_savecontrol(inp, &opts, ip, n); |
| 506 | } |
| 507 | |
| 508 | m_adj(n, off); |
| 509 | if (sbappendaddr(&so->so_rcv, src, n, |
| 510 | opts) == 0) { |
| 511 | m_freem(n); |
| 512 | if (opts) |
| 513 | m_freem(opts); |
| 514 | so->so_rcv.sb_overflowed++; |
| 515 | UDP_STATINC(UDP_STAT_FULLSOCK); |
| 516 | } else |
| 517 | sorwakeup(so); |
| 518 | } |
| 519 | } |
| 520 | #endif |
| 521 | |
| 522 | #ifdef INET |
| 523 | static int |
| 524 | udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, |
| 525 | struct mbuf **mp, int off /* offset of udphdr */) |
| 526 | { |
| 527 | u_int16_t *sport, *dport; |
| 528 | int rcvcnt; |
| 529 | struct in_addr *src4, *dst4; |
| 530 | struct inpcb_hdr *inph; |
| 531 | struct inpcb *inp; |
| 532 | struct mbuf *m = *mp; |
| 533 | |
| 534 | rcvcnt = 0; |
| 535 | off += sizeof(struct udphdr); /* now, offset of payload */ |
| 536 | |
| 537 | if (src->sin_family != AF_INET || dst->sin_family != AF_INET) |
| 538 | goto bad; |
| 539 | |
| 540 | src4 = &src->sin_addr; |
| 541 | sport = &src->sin_port; |
| 542 | dst4 = &dst->sin_addr; |
| 543 | dport = &dst->sin_port; |
| 544 | |
| 545 | if (IN_MULTICAST(dst4->s_addr) || |
| 546 | in_broadcast(*dst4, m_get_rcvif_NOMPSAFE(m))) { |
| 547 | /* |
| 548 | * Deliver a multicast or broadcast datagram to *all* sockets |
| 549 | * for which the local and remote addresses and ports match |
| 550 | * those of the incoming datagram. This allows more than |
| 551 | * one process to receive multi/broadcasts on the same port. |
| 552 | * (This really ought to be done for unicast datagrams as |
| 553 | * well, but that would cause problems with existing |
| 554 | * applications that open both address-specific sockets and |
| 555 | * a wildcard socket listening to the same port -- they would |
| 556 | * end up receiving duplicates of every unicast datagram. |
| 557 | * Those applications open the multiple sockets to overcome an |
| 558 | * inadequacy of the UDP socket interface, but for backwards |
| 559 | * compatibility we avoid the problem here rather than |
| 560 | * fixing the interface. Maybe 4.5BSD will remedy this?) |
| 561 | */ |
| 562 | |
| 563 | /* |
| 564 | * KAME note: traditionally we dropped udpiphdr from mbuf here. |
| 565 | * we need udpiphdr for IPsec processing so we do that later. |
| 566 | */ |
| 567 | /* |
| 568 | * Locate pcb(s) for datagram. |
| 569 | */ |
| 570 | TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { |
| 571 | inp = (struct inpcb *)inph; |
| 572 | if (inp->inp_af != AF_INET) |
| 573 | continue; |
| 574 | |
| 575 | if (inp->inp_lport != *dport) |
| 576 | continue; |
| 577 | if (!in_nullhost(inp->inp_laddr)) { |
| 578 | if (!in_hosteq(inp->inp_laddr, *dst4)) |
| 579 | continue; |
| 580 | } |
| 581 | if (!in_nullhost(inp->inp_faddr)) { |
| 582 | if (!in_hosteq(inp->inp_faddr, *src4) || |
| 583 | inp->inp_fport != *sport) |
| 584 | continue; |
| 585 | } |
| 586 | |
| 587 | udp4_sendup(m, off, (struct sockaddr *)src, |
| 588 | inp->inp_socket); |
| 589 | rcvcnt++; |
| 590 | |
| 591 | /* |
| 592 | * Don't look for additional matches if this one does |
| 593 | * not have either the SO_REUSEPORT or SO_REUSEADDR |
| 594 | * socket options set. This heuristic avoids searching |
| 595 | * through all pcbs in the common case of a non-shared |
| 596 | * port. It assumes that an application will never |
| 597 | * clear these options after setting them. |
| 598 | */ |
| 599 | if ((inp->inp_socket->so_options & |
| 600 | (SO_REUSEPORT|SO_REUSEADDR)) == 0) |
| 601 | break; |
| 602 | } |
| 603 | } else { |
| 604 | /* |
| 605 | * Locate pcb for datagram. |
| 606 | */ |
| 607 | inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, |
| 608 | *dport, 0); |
| 609 | if (inp == 0) { |
| 610 | UDP_STATINC(UDP_STAT_PCBHASHMISS); |
| 611 | inp = in_pcblookup_bind(&udbtable, *dst4, *dport); |
| 612 | if (inp == 0) |
| 613 | return rcvcnt; |
| 614 | } |
| 615 | |
| 616 | #ifdef IPSEC |
| 617 | /* Handle ESP over UDP */ |
| 618 | if (inp->inp_flags & INP_ESPINUDP_ALL) { |
| 619 | struct sockaddr *sa = (struct sockaddr *)src; |
| 620 | |
| 621 | switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { |
| 622 | case -1: /* Error, m was freeed */ |
| 623 | rcvcnt = -1; |
| 624 | goto bad; |
| 625 | break; |
| 626 | |
| 627 | case 1: /* ESP over UDP */ |
| 628 | rcvcnt++; |
| 629 | goto bad; |
| 630 | break; |
| 631 | |
| 632 | case 0: /* plain UDP */ |
| 633 | default: /* Unexpected */ |
| 634 | /* |
| 635 | * Normal UDP processing will take place |
| 636 | * m may have changed. |
| 637 | */ |
| 638 | m = *mp; |
| 639 | break; |
| 640 | } |
| 641 | } |
| 642 | #endif |
| 643 | |
| 644 | /* |
| 645 | * Check the minimum TTL for socket. |
| 646 | */ |
| 647 | if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl) |
| 648 | goto bad; |
| 649 | |
| 650 | udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); |
| 651 | rcvcnt++; |
| 652 | } |
| 653 | |
| 654 | bad: |
| 655 | return rcvcnt; |
| 656 | } |
| 657 | #endif |
| 658 | |
| 659 | #ifdef INET |
| 660 | /* |
| 661 | * Notify a udp user of an asynchronous error; |
| 662 | * just wake up so that he can collect error status. |
| 663 | */ |
| 664 | static void |
| 665 | udp_notify(struct inpcb *inp, int errno) |
| 666 | { |
| 667 | inp->inp_socket->so_error = errno; |
| 668 | sorwakeup(inp->inp_socket); |
| 669 | sowwakeup(inp->inp_socket); |
| 670 | } |
| 671 | |
| 672 | void * |
| 673 | udp_ctlinput(int cmd, const struct sockaddr *sa, void *v) |
| 674 | { |
| 675 | struct ip *ip = v; |
| 676 | struct udphdr *uh; |
| 677 | void (*notify)(struct inpcb *, int) = udp_notify; |
| 678 | int errno; |
| 679 | |
| 680 | if (sa->sa_family != AF_INET |
| 681 | || sa->sa_len != sizeof(struct sockaddr_in)) |
| 682 | return NULL; |
| 683 | if ((unsigned)cmd >= PRC_NCMDS) |
| 684 | return NULL; |
| 685 | errno = inetctlerrmap[cmd]; |
| 686 | if (PRC_IS_REDIRECT(cmd)) |
| 687 | notify = in_rtchange, ip = 0; |
| 688 | else if (cmd == PRC_HOSTDEAD) |
| 689 | ip = 0; |
| 690 | else if (errno == 0) |
| 691 | return NULL; |
| 692 | if (ip) { |
| 693 | uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2)); |
| 694 | in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport, |
| 695 | ip->ip_src, uh->uh_sport, errno, notify); |
| 696 | |
| 697 | /* XXX mapped address case */ |
| 698 | } else |
| 699 | in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno, |
| 700 | notify); |
| 701 | return NULL; |
| 702 | } |
| 703 | |
| 704 | int |
| 705 | udp_ctloutput(int op, struct socket *so, struct sockopt *sopt) |
| 706 | { |
| 707 | int s; |
| 708 | int error = 0; |
| 709 | struct inpcb *inp; |
| 710 | int family; |
| 711 | int optval; |
| 712 | |
| 713 | family = so->so_proto->pr_domain->dom_family; |
| 714 | |
| 715 | s = splsoftnet(); |
| 716 | switch (family) { |
| 717 | #ifdef INET |
| 718 | case PF_INET: |
| 719 | if (sopt->sopt_level != IPPROTO_UDP) { |
| 720 | error = ip_ctloutput(op, so, sopt); |
| 721 | goto end; |
| 722 | } |
| 723 | break; |
| 724 | #endif |
| 725 | #ifdef INET6 |
| 726 | case PF_INET6: |
| 727 | if (sopt->sopt_level != IPPROTO_UDP) { |
| 728 | error = ip6_ctloutput(op, so, sopt); |
| 729 | goto end; |
| 730 | } |
| 731 | break; |
| 732 | #endif |
| 733 | default: |
| 734 | error = EAFNOSUPPORT; |
| 735 | goto end; |
| 736 | } |
| 737 | |
| 738 | |
| 739 | switch (op) { |
| 740 | case PRCO_SETOPT: |
| 741 | inp = sotoinpcb(so); |
| 742 | |
| 743 | switch (sopt->sopt_name) { |
| 744 | case UDP_ENCAP: |
| 745 | error = sockopt_getint(sopt, &optval); |
| 746 | if (error) |
| 747 | break; |
| 748 | |
| 749 | switch(optval) { |
| 750 | case 0: |
| 751 | inp->inp_flags &= ~INP_ESPINUDP_ALL; |
| 752 | break; |
| 753 | |
| 754 | case UDP_ENCAP_ESPINUDP: |
| 755 | inp->inp_flags &= ~INP_ESPINUDP_ALL; |
| 756 | inp->inp_flags |= INP_ESPINUDP; |
| 757 | break; |
| 758 | |
| 759 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
| 760 | inp->inp_flags &= ~INP_ESPINUDP_ALL; |
| 761 | inp->inp_flags |= INP_ESPINUDP_NON_IKE; |
| 762 | break; |
| 763 | default: |
| 764 | error = EINVAL; |
| 765 | break; |
| 766 | } |
| 767 | break; |
| 768 | |
| 769 | default: |
| 770 | error = ENOPROTOOPT; |
| 771 | break; |
| 772 | } |
| 773 | break; |
| 774 | |
| 775 | default: |
| 776 | error = EINVAL; |
| 777 | break; |
| 778 | } |
| 779 | |
| 780 | end: |
| 781 | splx(s); |
| 782 | return error; |
| 783 | } |
| 784 | |
| 785 | |
| 786 | int |
| 787 | udp_output(struct mbuf *m, struct inpcb *inp) |
| 788 | { |
| 789 | struct udpiphdr *ui; |
| 790 | struct route *ro; |
| 791 | int len = m->m_pkthdr.len; |
| 792 | int error = 0; |
| 793 | |
| 794 | MCLAIM(m, &udp_tx_mowner); |
| 795 | |
| 796 | /* |
| 797 | * Calculate data length and get a mbuf |
| 798 | * for UDP and IP headers. |
| 799 | */ |
| 800 | M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); |
| 801 | if (m == 0) { |
| 802 | error = ENOBUFS; |
| 803 | goto release; |
| 804 | } |
| 805 | |
| 806 | /* |
| 807 | * Compute the packet length of the IP header, and |
| 808 | * punt if the length looks bogus. |
| 809 | */ |
| 810 | if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { |
| 811 | error = EMSGSIZE; |
| 812 | goto release; |
| 813 | } |
| 814 | |
| 815 | /* |
| 816 | * Fill in mbuf with extended UDP header |
| 817 | * and addresses and length put into network format. |
| 818 | */ |
| 819 | ui = mtod(m, struct udpiphdr *); |
| 820 | ui->ui_pr = IPPROTO_UDP; |
| 821 | ui->ui_src = inp->inp_laddr; |
| 822 | ui->ui_dst = inp->inp_faddr; |
| 823 | ui->ui_sport = inp->inp_lport; |
| 824 | ui->ui_dport = inp->inp_fport; |
| 825 | ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); |
| 826 | |
| 827 | ro = &inp->inp_route; |
| 828 | |
| 829 | /* |
| 830 | * Set up checksum and output datagram. |
| 831 | */ |
| 832 | if (udpcksum) { |
| 833 | /* |
| 834 | * XXX Cache pseudo-header checksum part for |
| 835 | * XXX "connected" UDP sockets. |
| 836 | */ |
| 837 | ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, |
| 838 | ui->ui_dst.s_addr, htons((u_int16_t)len + |
| 839 | sizeof(struct udphdr) + IPPROTO_UDP)); |
| 840 | m->m_pkthdr.csum_flags = M_CSUM_UDPv4; |
| 841 | m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); |
| 842 | } else |
| 843 | ui->ui_sum = 0; |
| 844 | ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); |
| 845 | ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ |
| 846 | ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ |
| 847 | UDP_STATINC(UDP_STAT_OPACKETS); |
| 848 | |
| 849 | return (ip_output(m, inp->inp_options, ro, |
| 850 | inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), |
| 851 | inp->inp_moptions, inp->inp_socket)); |
| 852 | |
| 853 | release: |
| 854 | m_freem(m); |
| 855 | return (error); |
| 856 | } |
| 857 | |
| 858 | static int |
| 859 | udp_attach(struct socket *so, int proto) |
| 860 | { |
| 861 | struct inpcb *inp; |
| 862 | int error; |
| 863 | |
| 864 | KASSERT(sotoinpcb(so) == NULL); |
| 865 | |
| 866 | /* Assign the lock (must happen even if we will error out). */ |
| 867 | sosetlock(so); |
| 868 | |
| 869 | #ifdef MBUFTRACE |
| 870 | so->so_mowner = &udp_mowner; |
| 871 | so->so_rcv.sb_mowner = &udp_rx_mowner; |
| 872 | so->so_snd.sb_mowner = &udp_tx_mowner; |
| 873 | #endif |
| 874 | if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { |
| 875 | error = soreserve(so, udp_sendspace, udp_recvspace); |
| 876 | if (error) { |
| 877 | return error; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | error = in_pcballoc(so, &udbtable); |
| 882 | if (error) { |
| 883 | return error; |
| 884 | } |
| 885 | inp = sotoinpcb(so); |
| 886 | inp->inp_ip.ip_ttl = ip_defttl; |
| 887 | KASSERT(solocked(so)); |
| 888 | |
| 889 | return error; |
| 890 | } |
| 891 | |
| 892 | static void |
| 893 | udp_detach(struct socket *so) |
| 894 | { |
| 895 | struct inpcb *inp; |
| 896 | |
| 897 | KASSERT(solocked(so)); |
| 898 | inp = sotoinpcb(so); |
| 899 | KASSERT(inp != NULL); |
| 900 | in_pcbdetach(inp); |
| 901 | } |
| 902 | |
| 903 | static int |
| 904 | udp_accept(struct socket *so, struct sockaddr *nam) |
| 905 | { |
| 906 | KASSERT(solocked(so)); |
| 907 | |
| 908 | panic("udp_accept" ); |
| 909 | |
| 910 | return EOPNOTSUPP; |
| 911 | } |
| 912 | |
| 913 | static int |
| 914 | udp_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) |
| 915 | { |
| 916 | struct inpcb *inp = sotoinpcb(so); |
| 917 | struct sockaddr_in *sin = (struct sockaddr_in *)nam; |
| 918 | int error = 0; |
| 919 | int s; |
| 920 | |
| 921 | KASSERT(solocked(so)); |
| 922 | KASSERT(inp != NULL); |
| 923 | KASSERT(nam != NULL); |
| 924 | |
| 925 | s = splsoftnet(); |
| 926 | error = in_pcbbind(inp, sin, l); |
| 927 | splx(s); |
| 928 | |
| 929 | return error; |
| 930 | } |
| 931 | |
| 932 | static int |
| 933 | udp_listen(struct socket *so, struct lwp *l) |
| 934 | { |
| 935 | KASSERT(solocked(so)); |
| 936 | |
| 937 | return EOPNOTSUPP; |
| 938 | } |
| 939 | |
| 940 | static int |
| 941 | udp_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) |
| 942 | { |
| 943 | struct inpcb *inp = sotoinpcb(so); |
| 944 | int error = 0; |
| 945 | int s; |
| 946 | |
| 947 | KASSERT(solocked(so)); |
| 948 | KASSERT(inp != NULL); |
| 949 | KASSERT(nam != NULL); |
| 950 | |
| 951 | s = splsoftnet(); |
| 952 | error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l); |
| 953 | if (! error) |
| 954 | soisconnected(so); |
| 955 | splx(s); |
| 956 | return error; |
| 957 | } |
| 958 | |
| 959 | static int |
| 960 | udp_connect2(struct socket *so, struct socket *so2) |
| 961 | { |
| 962 | KASSERT(solocked(so)); |
| 963 | |
| 964 | return EOPNOTSUPP; |
| 965 | } |
| 966 | |
| 967 | static int |
| 968 | udp_disconnect(struct socket *so) |
| 969 | { |
| 970 | struct inpcb *inp = sotoinpcb(so); |
| 971 | int s; |
| 972 | |
| 973 | KASSERT(solocked(so)); |
| 974 | KASSERT(inp != NULL); |
| 975 | |
| 976 | s = splsoftnet(); |
| 977 | /*soisdisconnected(so);*/ |
| 978 | so->so_state &= ~SS_ISCONNECTED; /* XXX */ |
| 979 | in_pcbdisconnect(inp); |
| 980 | inp->inp_laddr = zeroin_addr; /* XXX */ |
| 981 | in_pcbstate(inp, INP_BOUND); /* XXX */ |
| 982 | splx(s); |
| 983 | |
| 984 | return 0; |
| 985 | } |
| 986 | |
| 987 | static int |
| 988 | udp_shutdown(struct socket *so) |
| 989 | { |
| 990 | int s; |
| 991 | |
| 992 | KASSERT(solocked(so)); |
| 993 | |
| 994 | s = splsoftnet(); |
| 995 | socantsendmore(so); |
| 996 | splx(s); |
| 997 | |
| 998 | return 0; |
| 999 | } |
| 1000 | |
| 1001 | static int |
| 1002 | udp_abort(struct socket *so) |
| 1003 | { |
| 1004 | KASSERT(solocked(so)); |
| 1005 | |
| 1006 | panic("udp_abort" ); |
| 1007 | |
| 1008 | return EOPNOTSUPP; |
| 1009 | } |
| 1010 | |
| 1011 | static int |
| 1012 | udp_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp) |
| 1013 | { |
| 1014 | return in_control(so, cmd, nam, ifp); |
| 1015 | } |
| 1016 | |
| 1017 | static int |
| 1018 | udp_stat(struct socket *so, struct stat *ub) |
| 1019 | { |
| 1020 | KASSERT(solocked(so)); |
| 1021 | |
| 1022 | /* stat: don't bother with a blocksize. */ |
| 1023 | return 0; |
| 1024 | } |
| 1025 | |
| 1026 | static int |
| 1027 | udp_peeraddr(struct socket *so, struct sockaddr *nam) |
| 1028 | { |
| 1029 | int s; |
| 1030 | |
| 1031 | KASSERT(solocked(so)); |
| 1032 | KASSERT(sotoinpcb(so) != NULL); |
| 1033 | KASSERT(nam != NULL); |
| 1034 | |
| 1035 | s = splsoftnet(); |
| 1036 | in_setpeeraddr(sotoinpcb(so), (struct sockaddr_in *)nam); |
| 1037 | splx(s); |
| 1038 | |
| 1039 | return 0; |
| 1040 | } |
| 1041 | |
| 1042 | static int |
| 1043 | udp_sockaddr(struct socket *so, struct sockaddr *nam) |
| 1044 | { |
| 1045 | int s; |
| 1046 | |
| 1047 | KASSERT(solocked(so)); |
| 1048 | KASSERT(sotoinpcb(so) != NULL); |
| 1049 | KASSERT(nam != NULL); |
| 1050 | |
| 1051 | s = splsoftnet(); |
| 1052 | in_setsockaddr(sotoinpcb(so), (struct sockaddr_in *)nam); |
| 1053 | splx(s); |
| 1054 | |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
| 1058 | static int |
| 1059 | udp_rcvd(struct socket *so, int flags, struct lwp *l) |
| 1060 | { |
| 1061 | KASSERT(solocked(so)); |
| 1062 | |
| 1063 | return EOPNOTSUPP; |
| 1064 | } |
| 1065 | |
| 1066 | static int |
| 1067 | udp_recvoob(struct socket *so, struct mbuf *m, int flags) |
| 1068 | { |
| 1069 | KASSERT(solocked(so)); |
| 1070 | |
| 1071 | return EOPNOTSUPP; |
| 1072 | } |
| 1073 | |
| 1074 | static int |
| 1075 | udp_send(struct socket *so, struct mbuf *m, struct sockaddr *nam, |
| 1076 | struct mbuf *control, struct lwp *l) |
| 1077 | { |
| 1078 | struct inpcb *inp = sotoinpcb(so); |
| 1079 | int error = 0; |
| 1080 | struct in_addr laddr; /* XXX */ |
| 1081 | int s; |
| 1082 | |
| 1083 | KASSERT(solocked(so)); |
| 1084 | KASSERT(inp != NULL); |
| 1085 | KASSERT(m != NULL); |
| 1086 | |
| 1087 | if (control && control->m_len) { |
| 1088 | m_freem(control); |
| 1089 | m_freem(m); |
| 1090 | return EINVAL; |
| 1091 | } |
| 1092 | |
| 1093 | memset(&laddr, 0, sizeof laddr); |
| 1094 | |
| 1095 | s = splsoftnet(); |
| 1096 | if (nam) { |
| 1097 | laddr = inp->inp_laddr; /* XXX */ |
| 1098 | if ((so->so_state & SS_ISCONNECTED) != 0) { |
| 1099 | error = EISCONN; |
| 1100 | goto die; |
| 1101 | } |
| 1102 | error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l); |
| 1103 | if (error) |
| 1104 | goto die; |
| 1105 | } else { |
| 1106 | if ((so->so_state & SS_ISCONNECTED) == 0) { |
| 1107 | error = ENOTCONN; |
| 1108 | goto die; |
| 1109 | } |
| 1110 | } |
| 1111 | error = udp_output(m, inp); |
| 1112 | m = NULL; |
| 1113 | if (nam) { |
| 1114 | in_pcbdisconnect(inp); |
| 1115 | inp->inp_laddr = laddr; /* XXX */ |
| 1116 | in_pcbstate(inp, INP_BOUND); /* XXX */ |
| 1117 | } |
| 1118 | die: |
| 1119 | if (m) |
| 1120 | m_freem(m); |
| 1121 | |
| 1122 | splx(s); |
| 1123 | return error; |
| 1124 | } |
| 1125 | |
| 1126 | static int |
| 1127 | udp_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) |
| 1128 | { |
| 1129 | KASSERT(solocked(so)); |
| 1130 | |
| 1131 | m_freem(m); |
| 1132 | m_freem(control); |
| 1133 | |
| 1134 | return EOPNOTSUPP; |
| 1135 | } |
| 1136 | |
| 1137 | static int |
| 1138 | udp_purgeif(struct socket *so, struct ifnet *ifp) |
| 1139 | { |
| 1140 | int s; |
| 1141 | |
| 1142 | s = splsoftnet(); |
| 1143 | #ifndef NET_MPSAFE |
| 1144 | mutex_enter(softnet_lock); |
| 1145 | #endif |
| 1146 | in_pcbpurgeif0(&udbtable, ifp); |
| 1147 | in_purgeif(ifp); |
| 1148 | in_pcbpurgeif(&udbtable, ifp); |
| 1149 | #ifndef NET_MPSAFE |
| 1150 | mutex_exit(softnet_lock); |
| 1151 | #endif |
| 1152 | splx(s); |
| 1153 | |
| 1154 | return 0; |
| 1155 | } |
| 1156 | |
| 1157 | static int |
| 1158 | sysctl_net_inet_udp_stats(SYSCTLFN_ARGS) |
| 1159 | { |
| 1160 | |
| 1161 | return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS)); |
| 1162 | } |
| 1163 | |
| 1164 | /* |
| 1165 | * Sysctl for udp variables. |
| 1166 | */ |
| 1167 | static void |
| 1168 | sysctl_net_inet_udp_setup(struct sysctllog **clog) |
| 1169 | { |
| 1170 | |
| 1171 | sysctl_createv(clog, 0, NULL, NULL, |
| 1172 | CTLFLAG_PERMANENT, |
| 1173 | CTLTYPE_NODE, "inet" , NULL, |
| 1174 | NULL, 0, NULL, 0, |
| 1175 | CTL_NET, PF_INET, CTL_EOL); |
| 1176 | sysctl_createv(clog, 0, NULL, NULL, |
| 1177 | CTLFLAG_PERMANENT, |
| 1178 | CTLTYPE_NODE, "udp" , |
| 1179 | SYSCTL_DESCR("UDPv4 related settings" ), |
| 1180 | NULL, 0, NULL, 0, |
| 1181 | CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); |
| 1182 | |
| 1183 | sysctl_createv(clog, 0, NULL, NULL, |
| 1184 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1185 | CTLTYPE_INT, "checksum" , |
| 1186 | SYSCTL_DESCR("Compute UDP checksums" ), |
| 1187 | NULL, 0, &udpcksum, 0, |
| 1188 | CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, |
| 1189 | CTL_EOL); |
| 1190 | sysctl_createv(clog, 0, NULL, NULL, |
| 1191 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1192 | CTLTYPE_INT, "sendspace" , |
| 1193 | SYSCTL_DESCR("Default UDP send buffer size" ), |
| 1194 | NULL, 0, &udp_sendspace, 0, |
| 1195 | CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, |
| 1196 | CTL_EOL); |
| 1197 | sysctl_createv(clog, 0, NULL, NULL, |
| 1198 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1199 | CTLTYPE_INT, "recvspace" , |
| 1200 | SYSCTL_DESCR("Default UDP receive buffer size" ), |
| 1201 | NULL, 0, &udp_recvspace, 0, |
| 1202 | CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, |
| 1203 | CTL_EOL); |
| 1204 | sysctl_createv(clog, 0, NULL, NULL, |
| 1205 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1206 | CTLTYPE_INT, "do_loopback_cksum" , |
| 1207 | SYSCTL_DESCR("Perform UDP checksum on loopback" ), |
| 1208 | NULL, 0, &udp_do_loopback_cksum, 0, |
| 1209 | CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, |
| 1210 | CTL_EOL); |
| 1211 | sysctl_createv(clog, 0, NULL, NULL, |
| 1212 | CTLFLAG_PERMANENT, |
| 1213 | CTLTYPE_STRUCT, "pcblist" , |
| 1214 | SYSCTL_DESCR("UDP protocol control block list" ), |
| 1215 | sysctl_inpcblist, 0, &udbtable, 0, |
| 1216 | CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, |
| 1217 | CTL_EOL); |
| 1218 | sysctl_createv(clog, 0, NULL, NULL, |
| 1219 | CTLFLAG_PERMANENT, |
| 1220 | CTLTYPE_STRUCT, "stats" , |
| 1221 | SYSCTL_DESCR("UDP statistics" ), |
| 1222 | sysctl_net_inet_udp_stats, 0, NULL, 0, |
| 1223 | CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, |
| 1224 | CTL_EOL); |
| 1225 | } |
| 1226 | #endif |
| 1227 | |
| 1228 | void |
| 1229 | udp_statinc(u_int stat) |
| 1230 | { |
| 1231 | |
| 1232 | KASSERT(stat < UDP_NSTATS); |
| 1233 | UDP_STATINC(stat); |
| 1234 | } |
| 1235 | |
| 1236 | #if defined(INET) && defined(IPSEC) |
| 1237 | /* |
| 1238 | * Returns: |
| 1239 | * 1 if the packet was processed |
| 1240 | * 0 if normal UDP processing should take place |
| 1241 | * -1 if an error occurent and m was freed |
| 1242 | */ |
| 1243 | static int |
| 1244 | udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src, |
| 1245 | struct socket *so) |
| 1246 | { |
| 1247 | size_t len; |
| 1248 | void *data; |
| 1249 | struct inpcb *inp; |
| 1250 | size_t skip = 0; |
| 1251 | size_t minlen; |
| 1252 | size_t iphdrlen; |
| 1253 | struct ip *ip; |
| 1254 | struct m_tag *tag; |
| 1255 | struct udphdr *udphdr; |
| 1256 | u_int16_t sport, dport; |
| 1257 | struct mbuf *m = *mp; |
| 1258 | |
| 1259 | /* |
| 1260 | * Collapse the mbuf chain if the first mbuf is too short |
| 1261 | * The longest case is: UDP + non ESP marker + ESP |
| 1262 | */ |
| 1263 | minlen = off + sizeof(u_int64_t) + sizeof(struct esp); |
| 1264 | if (minlen > m->m_pkthdr.len) |
| 1265 | minlen = m->m_pkthdr.len; |
| 1266 | |
| 1267 | if (m->m_len < minlen) { |
| 1268 | if ((*mp = m_pullup(m, minlen)) == NULL) { |
| 1269 | printf("udp4_espinudp: m_pullup failed\n" ); |
| 1270 | return -1; |
| 1271 | } |
| 1272 | m = *mp; |
| 1273 | } |
| 1274 | |
| 1275 | len = m->m_len - off; |
| 1276 | data = mtod(m, char *) + off; |
| 1277 | inp = sotoinpcb(so); |
| 1278 | |
| 1279 | /* Ignore keepalive packets */ |
| 1280 | if ((len == 1) && (*(unsigned char *)data == 0xff)) { |
| 1281 | m_free(m); |
| 1282 | *mp = NULL; /* avoid any further processiong by caller ... */ |
| 1283 | return 1; |
| 1284 | } |
| 1285 | |
| 1286 | /* |
| 1287 | * Check that the payload is long enough to hold |
| 1288 | * an ESP header and compute the length of encapsulation |
| 1289 | * header to remove |
| 1290 | */ |
| 1291 | if (inp->inp_flags & INP_ESPINUDP) { |
| 1292 | u_int32_t *st = (u_int32_t *)data; |
| 1293 | |
| 1294 | if ((len <= sizeof(struct esp)) || (*st == 0)) |
| 1295 | return 0; /* Normal UDP processing */ |
| 1296 | |
| 1297 | skip = sizeof(struct udphdr); |
| 1298 | } |
| 1299 | |
| 1300 | if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { |
| 1301 | u_int32_t *st = (u_int32_t *)data; |
| 1302 | |
| 1303 | if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) |
| 1304 | || ((st[0] | st[1]) != 0)) |
| 1305 | return 0; /* Normal UDP processing */ |
| 1306 | |
| 1307 | skip = sizeof(struct udphdr) + sizeof(u_int64_t); |
| 1308 | } |
| 1309 | |
| 1310 | /* |
| 1311 | * Get the UDP ports. They are handled in network |
| 1312 | * order everywhere in IPSEC_NAT_T code. |
| 1313 | */ |
| 1314 | udphdr = (struct udphdr *)((char *)data - skip); |
| 1315 | sport = udphdr->uh_sport; |
| 1316 | dport = udphdr->uh_dport; |
| 1317 | |
| 1318 | /* |
| 1319 | * Remove the UDP header (and possibly the non ESP marker) |
| 1320 | * IP header lendth is iphdrlen |
| 1321 | * Before: |
| 1322 | * <--- off ---> |
| 1323 | * +----+------+-----+ |
| 1324 | * | IP | UDP | ESP | |
| 1325 | * +----+------+-----+ |
| 1326 | * <-skip-> |
| 1327 | * After: |
| 1328 | * +----+-----+ |
| 1329 | * | IP | ESP | |
| 1330 | * +----+-----+ |
| 1331 | * <-skip-> |
| 1332 | */ |
| 1333 | iphdrlen = off - sizeof(struct udphdr); |
| 1334 | memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen); |
| 1335 | m_adj(m, skip); |
| 1336 | |
| 1337 | ip = mtod(m, struct ip *); |
| 1338 | ip->ip_len = htons(ntohs(ip->ip_len) - skip); |
| 1339 | ip->ip_p = IPPROTO_ESP; |
| 1340 | |
| 1341 | /* |
| 1342 | * We have modified the packet - it is now ESP, so we should not |
| 1343 | * return to UDP processing ... |
| 1344 | * |
| 1345 | * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember |
| 1346 | * the source UDP port. This is required if we want |
| 1347 | * to select the right SPD for multiple hosts behind |
| 1348 | * same NAT |
| 1349 | */ |
| 1350 | if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, |
| 1351 | sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { |
| 1352 | printf("udp4_espinudp: m_tag_get failed\n" ); |
| 1353 | m_freem(m); |
| 1354 | return -1; |
| 1355 | } |
| 1356 | ((u_int16_t *)(tag + 1))[0] = sport; |
| 1357 | ((u_int16_t *)(tag + 1))[1] = dport; |
| 1358 | m_tag_prepend(m, tag); |
| 1359 | |
| 1360 | if (ipsec_used) |
| 1361 | ipsec4_common_input(m, iphdrlen, IPPROTO_ESP); |
| 1362 | /* XXX: else */ |
| 1363 | |
| 1364 | /* We handled it, it shouldn't be handled by UDP */ |
| 1365 | *mp = NULL; /* avoid free by caller ... */ |
| 1366 | return 1; |
| 1367 | } |
| 1368 | #endif |
| 1369 | |
| 1370 | PR_WRAP_USRREQS(udp) |
| 1371 | #define udp_attach udp_attach_wrapper |
| 1372 | #define udp_detach udp_detach_wrapper |
| 1373 | #define udp_accept udp_accept_wrapper |
| 1374 | #define udp_bind udp_bind_wrapper |
| 1375 | #define udp_listen udp_listen_wrapper |
| 1376 | #define udp_connect udp_connect_wrapper |
| 1377 | #define udp_connect2 udp_connect2_wrapper |
| 1378 | #define udp_disconnect udp_disconnect_wrapper |
| 1379 | #define udp_shutdown udp_shutdown_wrapper |
| 1380 | #define udp_abort udp_abort_wrapper |
| 1381 | #define udp_ioctl udp_ioctl_wrapper |
| 1382 | #define udp_stat udp_stat_wrapper |
| 1383 | #define udp_peeraddr udp_peeraddr_wrapper |
| 1384 | #define udp_sockaddr udp_sockaddr_wrapper |
| 1385 | #define udp_rcvd udp_rcvd_wrapper |
| 1386 | #define udp_recvoob udp_recvoob_wrapper |
| 1387 | #define udp_send udp_send_wrapper |
| 1388 | #define udp_sendoob udp_sendoob_wrapper |
| 1389 | #define udp_purgeif udp_purgeif_wrapper |
| 1390 | |
| 1391 | const struct pr_usrreqs udp_usrreqs = { |
| 1392 | .pr_attach = udp_attach, |
| 1393 | .pr_detach = udp_detach, |
| 1394 | .pr_accept = udp_accept, |
| 1395 | .pr_bind = udp_bind, |
| 1396 | .pr_listen = udp_listen, |
| 1397 | .pr_connect = udp_connect, |
| 1398 | .pr_connect2 = udp_connect2, |
| 1399 | .pr_disconnect = udp_disconnect, |
| 1400 | .pr_shutdown = udp_shutdown, |
| 1401 | .pr_abort = udp_abort, |
| 1402 | .pr_ioctl = udp_ioctl, |
| 1403 | .pr_stat = udp_stat, |
| 1404 | .pr_peeraddr = udp_peeraddr, |
| 1405 | .pr_sockaddr = udp_sockaddr, |
| 1406 | .pr_rcvd = udp_rcvd, |
| 1407 | .pr_recvoob = udp_recvoob, |
| 1408 | .pr_send = udp_send, |
| 1409 | .pr_sendoob = udp_sendoob, |
| 1410 | .pr_purgeif = udp_purgeif, |
| 1411 | }; |
| 1412 | |