1 /* $NetBSD: udp6_usrreq.c,v 1.90 2011/09/24 17:22:14 christos Exp $ */ 2 /* $KAME: udp6_usrreq.c,v 1.86 2001/05/27 17:33:00 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1989, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.90 2011/09/24 17:22:14 christos Exp $"); 66 67 #include "opt_inet.h" 68 69 #include <sys/param.h> 70 #include <sys/malloc.h> 71 #include <sys/mbuf.h> 72 #include <sys/protosw.h> 73 #include <sys/socket.h> 74 #include <sys/socketvar.h> 75 #include <sys/errno.h> 76 #include <sys/stat.h> 77 #include <sys/systm.h> 78 #include <sys/proc.h> 79 #include <sys/syslog.h> 80 #include <sys/domain.h> 81 #include <sys/sysctl.h> 82 83 #include <net/if.h> 84 #include <net/route.h> 85 #include <net/if_types.h> 86 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet/in_systm.h> 90 #include <netinet/ip.h> 91 #include <netinet/ip_var.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet/udp.h> 94 #include <netinet/udp_var.h> 95 #include <netinet/rfc6056.h> 96 #include <netinet/ip6.h> 97 #include <netinet6/ip6_var.h> 98 #include <netinet6/in6_pcb.h> 99 #include <netinet/icmp6.h> 100 #include <netinet6/udp6_var.h> 101 #include <netinet6/udp6_private.h> 102 #include <netinet6/ip6protosw.h> 103 #include <netinet/in_offload.h> 104 105 #include "faith.h" 106 #if defined(NFAITH) && NFAITH > 0 107 #include <net/if_faith.h> 108 #endif 109 110 /* 111 * UDP protocol implementation. 112 * Per RFC 768, August, 1980. 113 */ 114 115 extern struct inpcbtable udbtable; 116 117 percpu_t *udp6stat_percpu; 118 119 static void udp6_notify(struct in6pcb *, int); 120 static void sysctl_net_inet6_udp6_setup(struct sysctllog **); 121 122 void 123 udp6_init(void) 124 { 125 126 sysctl_net_inet6_udp6_setup(NULL); 127 } 128 129 /* 130 * Notify a udp user of an asynchronous error; 131 * just wake up so that he can collect error status. 132 */ 133 static void 134 udp6_notify(struct in6pcb *in6p, int errno) 135 { 136 in6p->in6p_socket->so_error = errno; 137 sorwakeup(in6p->in6p_socket); 138 sowwakeup(in6p->in6p_socket); 139 } 140 141 void * 142 udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 143 { 144 struct udphdr uh; 145 struct ip6_hdr *ip6; 146 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 147 struct mbuf *m; 148 int off; 149 void *cmdarg; 150 struct ip6ctlparam *ip6cp = NULL; 151 const struct sockaddr_in6 *sa6_src = NULL; 152 void (*notify)(struct in6pcb *, int) = udp6_notify; 153 struct udp_portonly { 154 u_int16_t uh_sport; 155 u_int16_t uh_dport; 156 } *uhp; 157 158 if (sa->sa_family != AF_INET6 || 159 sa->sa_len != sizeof(struct sockaddr_in6)) 160 return NULL; 161 162 if ((unsigned)cmd >= PRC_NCMDS) 163 return NULL; 164 if (PRC_IS_REDIRECT(cmd)) 165 notify = in6_rtchange, d = NULL; 166 else if (cmd == PRC_HOSTDEAD) 167 d = NULL; 168 else if (cmd == PRC_MSGSIZE) { 169 /* special code is present, see below */ 170 notify = in6_rtchange; 171 } 172 else if (inet6ctlerrmap[cmd] == 0) 173 return NULL; 174 175 /* if the parameter is from icmp6, decode it. */ 176 if (d != NULL) { 177 ip6cp = (struct ip6ctlparam *)d; 178 m = ip6cp->ip6c_m; 179 ip6 = ip6cp->ip6c_ip6; 180 off = ip6cp->ip6c_off; 181 cmdarg = ip6cp->ip6c_cmdarg; 182 sa6_src = ip6cp->ip6c_src; 183 } else { 184 m = NULL; 185 ip6 = NULL; 186 cmdarg = NULL; 187 sa6_src = &sa6_any; 188 off = 0; 189 } 190 191 if (ip6) { 192 /* 193 * XXX: We assume that when IPV6 is non NULL, 194 * M and OFF are valid. 195 */ 196 197 /* check if we can safely examine src and dst ports */ 198 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 199 if (cmd == PRC_MSGSIZE) 200 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 201 return NULL; 202 } 203 204 memset(&uh, 0, sizeof(uh)); 205 m_copydata(m, off, sizeof(*uhp), (void *)&uh); 206 207 if (cmd == PRC_MSGSIZE) { 208 int valid = 0; 209 210 /* 211 * Check to see if we have a valid UDP socket 212 * corresponding to the address in the ICMPv6 message 213 * payload. 214 */ 215 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr, 216 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, 217 uh.uh_sport, 0, 0)) 218 valid++; 219 #if 0 220 /* 221 * As the use of sendto(2) is fairly popular, 222 * we may want to allow non-connected pcb too. 223 * But it could be too weak against attacks... 224 * We should at least check if the local address (= s) 225 * is really ours. 226 */ 227 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr, 228 uh.uh_dport, 0)) 229 valid++; 230 #endif 231 232 /* 233 * Depending on the value of "valid" and routing table 234 * size (mtudisc_{hi,lo}wat), we will: 235 * - recalculate the new MTU and create the 236 * corresponding routing entry, or 237 * - ignore the MTU change notification. 238 */ 239 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 240 241 /* 242 * regardless of if we called 243 * icmp6_mtudisc_update(), we need to call 244 * in6_pcbnotify(), to notify path MTU change 245 * to the userland (RFC3542), because some 246 * unconnected sockets may share the same 247 * destination and want to know the path MTU. 248 */ 249 } 250 251 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, 252 (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 253 notify); 254 } else { 255 (void) in6_pcbnotify(&udbtable, sa, 0, 256 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 257 } 258 return NULL; 259 } 260 261 int 262 udp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 263 { 264 int s; 265 int error = 0; 266 struct inpcb *inp; 267 int family; 268 int optval; 269 270 family = so->so_proto->pr_domain->dom_family; 271 272 s = splsoftnet(); 273 switch (family) { 274 #ifdef INET 275 case PF_INET: 276 if (sopt->sopt_level != IPPROTO_UDP) { 277 error = ip_ctloutput(op, so, sopt); 278 goto end; 279 } 280 break; 281 #endif 282 #ifdef INET6 283 case PF_INET6: 284 if (sopt->sopt_level != IPPROTO_UDP) { 285 error = ip6_ctloutput(op, so, sopt); 286 goto end; 287 } 288 break; 289 #endif 290 default: 291 error = EAFNOSUPPORT; 292 goto end; 293 } 294 295 switch (op) { 296 case PRCO_SETOPT: 297 inp = sotoinpcb(so); 298 299 switch (sopt->sopt_name) { 300 case UDP_RFC6056ALGO: 301 error = sockopt_getint(sopt, &optval); 302 if (error) 303 break; 304 305 error = rfc6056_algo_index_select( 306 (struct inpcb_hdr *)inp, optval); 307 break; 308 309 default: 310 error = ENOPROTOOPT; 311 break; 312 } 313 break; 314 315 default: 316 error = EINVAL; 317 break; 318 } 319 320 end: 321 splx(s); 322 return error; 323 } 324 325 326 extern int udp6_sendspace; 327 extern int udp6_recvspace; 328 329 int 330 udp6_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr6, 331 struct mbuf *control, struct lwp *l) 332 { 333 struct in6pcb *in6p = sotoin6pcb(so); 334 int error = 0; 335 int s; 336 337 /* 338 * MAPPED_ADDR implementation info: 339 * Mapped addr support for PRU_CONTROL is not necessary. 340 * Because typical user of PRU_CONTROL is such as ifconfig, 341 * and they don't associate any addr to their socket. Then 342 * socket family is only hint about the PRU_CONTROL'ed address 343 * family, especially when getting addrs from kernel. 344 * So AF_INET socket need to be used to control AF_INET addrs, 345 * and AF_INET6 socket for AF_INET6 addrs. 346 */ 347 if (req == PRU_CONTROL) 348 return in6_control(so, (u_long)m, (void *)addr6, 349 (struct ifnet *)control, l); 350 351 if (req == PRU_PURGEIF) { 352 mutex_enter(softnet_lock); 353 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control); 354 in6_purgeif((struct ifnet *)control); 355 in6_pcbpurgeif(&udbtable, (struct ifnet *)control); 356 mutex_exit(softnet_lock); 357 return 0; 358 } 359 360 if (req == PRU_ATTACH) 361 sosetlock(so); 362 else if (in6p == NULL) { 363 error = EINVAL; 364 goto release; 365 } 366 367 switch (req) { 368 case PRU_ATTACH: 369 /* 370 * MAPPED_ADDR implementation spec: 371 * Always attach for IPv6, 372 * and only when necessary for IPv4. 373 */ 374 if (in6p != NULL) { 375 error = EINVAL; 376 break; 377 } 378 s = splsoftnet(); 379 error = in6_pcballoc(so, &udbtable); 380 splx(s); 381 if (error) 382 break; 383 error = soreserve(so, udp6_sendspace, udp6_recvspace); 384 if (error) 385 break; 386 in6p = sotoin6pcb(so); 387 in6p->in6p_cksum = -1; /* just to be sure */ 388 break; 389 390 case PRU_DETACH: 391 in6_pcbdetach(in6p); 392 break; 393 394 case PRU_BIND: 395 s = splsoftnet(); 396 error = in6_pcbbind(in6p, addr6, l); 397 splx(s); 398 break; 399 400 case PRU_CONNECT: 401 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 402 error = EISCONN; 403 break; 404 } 405 s = splsoftnet(); 406 error = in6_pcbconnect(in6p, addr6, l); 407 splx(s); 408 if (error == 0) 409 soisconnected(so); 410 break; 411 412 case PRU_DISCONNECT: 413 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 414 error = ENOTCONN; 415 break; 416 } 417 s = splsoftnet(); 418 in6_pcbdisconnect(in6p); 419 memset((void *)&in6p->in6p_laddr, 0, sizeof(in6p->in6p_laddr)); 420 splx(s); 421 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 422 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 423 break; 424 425 case PRU_SHUTDOWN: 426 socantsendmore(so); 427 break; 428 429 case PRU_SEND: 430 s = splsoftnet(); 431 error = udp6_output(in6p, m, addr6, control, l); 432 splx(s); 433 return error; 434 435 case PRU_ABORT: 436 soisdisconnected(so); 437 in6_pcbdetach(in6p); 438 break; 439 440 case PRU_SOCKADDR: 441 in6_setsockaddr(in6p, addr6); 442 break; 443 444 case PRU_PEERADDR: 445 in6_setpeeraddr(in6p, addr6); 446 break; 447 448 case PRU_SENSE: 449 /* 450 * stat: don't bother with a blocksize 451 */ 452 return 0; 453 454 case PRU_LISTEN: 455 case PRU_CONNECT2: 456 case PRU_ACCEPT: 457 case PRU_SENDOOB: 458 case PRU_FASTTIMO: 459 case PRU_SLOWTIMO: 460 case PRU_PROTORCV: 461 case PRU_PROTOSEND: 462 error = EOPNOTSUPP; 463 break; 464 465 case PRU_RCVD: 466 case PRU_RCVOOB: 467 return EOPNOTSUPP; /* do not free mbuf's */ 468 469 default: 470 panic("udp6_usrreq"); 471 } 472 473 release: 474 if (control != NULL) 475 m_freem(control); 476 if (m != NULL) 477 m_freem(m); 478 return error; 479 } 480 481 static int 482 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 483 { 484 485 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 486 } 487 488 static void 489 sysctl_net_inet6_udp6_setup(struct sysctllog **clog) 490 { 491 const struct sysctlnode *rfc6056_node; 492 493 sysctl_createv(clog, 0, NULL, NULL, 494 CTLFLAG_PERMANENT, 495 CTLTYPE_NODE, "net", NULL, 496 NULL, 0, NULL, 0, 497 CTL_NET, CTL_EOL); 498 sysctl_createv(clog, 0, NULL, NULL, 499 CTLFLAG_PERMANENT, 500 CTLTYPE_NODE, "inet6", NULL, 501 NULL, 0, NULL, 0, 502 CTL_NET, PF_INET6, CTL_EOL); 503 sysctl_createv(clog, 0, NULL, NULL, 504 CTLFLAG_PERMANENT, 505 CTLTYPE_NODE, "udp6", 506 SYSCTL_DESCR("UDPv6 related settings"), 507 NULL, 0, NULL, 0, 508 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 509 510 sysctl_createv(clog, 0, NULL, NULL, 511 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 512 CTLTYPE_INT, "sendspace", 513 SYSCTL_DESCR("Default UDP send buffer size"), 514 NULL, 0, &udp6_sendspace, 0, 515 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 516 CTL_EOL); 517 sysctl_createv(clog, 0, NULL, NULL, 518 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 519 CTLTYPE_INT, "recvspace", 520 SYSCTL_DESCR("Default UDP receive buffer size"), 521 NULL, 0, &udp6_recvspace, 0, 522 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 523 CTL_EOL); 524 sysctl_createv(clog, 0, NULL, NULL, 525 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 526 CTLTYPE_INT, "do_loopback_cksum", 527 SYSCTL_DESCR("Perform UDP checksum on loopback"), 528 NULL, 0, &udp_do_loopback_cksum, 0, 529 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 530 CTL_EOL); 531 sysctl_createv(clog, 0, NULL, NULL, 532 CTLFLAG_PERMANENT, 533 CTLTYPE_STRUCT, "pcblist", 534 SYSCTL_DESCR("UDP protocol control block list"), 535 sysctl_inpcblist, 0, &udbtable, 0, 536 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 537 CTL_EOL); 538 sysctl_createv(clog, 0, NULL, NULL, 539 CTLFLAG_PERMANENT, 540 CTLTYPE_STRUCT, "stats", 541 SYSCTL_DESCR("UDPv6 statistics"), 542 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 543 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 544 CTL_EOL); 545 /* RFC6056 subtree */ 546 sysctl_createv(clog, 0, NULL, &rfc6056_node, 547 CTLFLAG_PERMANENT, 548 CTLTYPE_NODE, "rfc6056", 549 SYSCTL_DESCR("RFC 6056"), 550 NULL, 0, NULL, 0, 551 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, CTL_EOL); 552 sysctl_createv(clog, 0, &rfc6056_node, NULL, 553 CTLFLAG_PERMANENT, 554 CTLTYPE_STRING, "available", 555 SYSCTL_DESCR("RFC 6056 available algorithms"), 556 sysctl_rfc6056_available, 0, NULL, RFC6056_MAXLEN, 557 CTL_CREATE, CTL_EOL); 558 sysctl_createv(clog, 0, &rfc6056_node, NULL, 559 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 560 CTLTYPE_STRING, "selected", 561 SYSCTL_DESCR("RFC 6056 selected algorithm"), 562 sysctl_rfc6056_selected6, 0, NULL, RFC6056_MAXLEN, 563 CTL_CREATE, CTL_EOL); 564 } 565 566 void 567 udp6_statinc(u_int stat) 568 { 569 570 KASSERT(stat < UDP6_NSTATS); 571 UDP6_STATINC(stat); 572 } 573