udp6_usrreq.c revision 1.94
1 /* $NetBSD: udp6_usrreq.c,v 1.94 2014/05/18 14:46:16 rmind 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 1.94 2014/05/18 14:46:16 rmind 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/ip6.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/in6_pcb.h> 98 #include <netinet/icmp6.h> 99 #include <netinet6/udp6_var.h> 100 #include <netinet6/udp6_private.h> 101 #include <netinet6/ip6protosw.h> 102 #include <netinet/in_offload.h> 103 104 #include "faith.h" 105 #if defined(NFAITH) && NFAITH > 0 106 #include <net/if_faith.h> 107 #endif 108 109 /* 110 * UDP protocol implementation. 111 * Per RFC 768, August, 1980. 112 */ 113 114 extern struct inpcbtable udbtable; 115 116 percpu_t *udp6stat_percpu; 117 118 static void udp6_notify(struct in6pcb *, int); 119 static void sysctl_net_inet6_udp6_setup(struct sysctllog **); 120 121 void 122 udp6_init(void) 123 { 124 125 sysctl_net_inet6_udp6_setup(NULL); 126 udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS); 127 128 udp_init_common(); 129 } 130 131 /* 132 * Notify a udp user of an asynchronous error; 133 * just wake up so that he can collect error status. 134 */ 135 static void 136 udp6_notify(struct in6pcb *in6p, int errno) 137 { 138 in6p->in6p_socket->so_error = errno; 139 sorwakeup(in6p->in6p_socket); 140 sowwakeup(in6p->in6p_socket); 141 } 142 143 void * 144 udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 145 { 146 struct udphdr uh; 147 struct ip6_hdr *ip6; 148 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 149 struct mbuf *m; 150 int off; 151 void *cmdarg; 152 struct ip6ctlparam *ip6cp = NULL; 153 const struct sockaddr_in6 *sa6_src = NULL; 154 void (*notify)(struct in6pcb *, int) = udp6_notify; 155 struct udp_portonly { 156 u_int16_t uh_sport; 157 u_int16_t uh_dport; 158 } *uhp; 159 160 if (sa->sa_family != AF_INET6 || 161 sa->sa_len != sizeof(struct sockaddr_in6)) 162 return NULL; 163 164 if ((unsigned)cmd >= PRC_NCMDS) 165 return NULL; 166 if (PRC_IS_REDIRECT(cmd)) 167 notify = in6_rtchange, d = NULL; 168 else if (cmd == PRC_HOSTDEAD) 169 d = NULL; 170 else if (cmd == PRC_MSGSIZE) { 171 /* special code is present, see below */ 172 notify = in6_rtchange; 173 } 174 else if (inet6ctlerrmap[cmd] == 0) 175 return NULL; 176 177 /* if the parameter is from icmp6, decode it. */ 178 if (d != NULL) { 179 ip6cp = (struct ip6ctlparam *)d; 180 m = ip6cp->ip6c_m; 181 ip6 = ip6cp->ip6c_ip6; 182 off = ip6cp->ip6c_off; 183 cmdarg = ip6cp->ip6c_cmdarg; 184 sa6_src = ip6cp->ip6c_src; 185 } else { 186 m = NULL; 187 ip6 = NULL; 188 cmdarg = NULL; 189 sa6_src = &sa6_any; 190 off = 0; 191 } 192 193 if (ip6) { 194 /* 195 * XXX: We assume that when IPV6 is non NULL, 196 * M and OFF are valid. 197 */ 198 199 /* check if we can safely examine src and dst ports */ 200 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 201 if (cmd == PRC_MSGSIZE) 202 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 203 return NULL; 204 } 205 206 memset(&uh, 0, sizeof(uh)); 207 m_copydata(m, off, sizeof(*uhp), (void *)&uh); 208 209 if (cmd == PRC_MSGSIZE) { 210 int valid = 0; 211 212 /* 213 * Check to see if we have a valid UDP socket 214 * corresponding to the address in the ICMPv6 message 215 * payload. 216 */ 217 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr, 218 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, 219 uh.uh_sport, 0, 0)) 220 valid++; 221 #if 0 222 /* 223 * As the use of sendto(2) is fairly popular, 224 * we may want to allow non-connected pcb too. 225 * But it could be too weak against attacks... 226 * We should at least check if the local address (= s) 227 * is really ours. 228 */ 229 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr, 230 uh.uh_dport, 0)) 231 valid++; 232 #endif 233 234 /* 235 * Depending on the value of "valid" and routing table 236 * size (mtudisc_{hi,lo}wat), we will: 237 * - recalculate the new MTU and create the 238 * corresponding routing entry, or 239 * - ignore the MTU change notification. 240 */ 241 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 242 243 /* 244 * regardless of if we called 245 * icmp6_mtudisc_update(), we need to call 246 * in6_pcbnotify(), to notify path MTU change 247 * to the userland (RFC3542), because some 248 * unconnected sockets may share the same 249 * destination and want to know the path MTU. 250 */ 251 } 252 253 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, 254 (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 255 notify); 256 } else { 257 (void) in6_pcbnotify(&udbtable, sa, 0, 258 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 259 } 260 return NULL; 261 } 262 263 int 264 udp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 265 { 266 int s; 267 int error = 0; 268 int family; 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 error = EINVAL; 295 296 end: 297 splx(s); 298 return error; 299 } 300 301 302 extern int udp6_sendspace; 303 extern int udp6_recvspace; 304 305 int 306 udp6_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr6, 307 struct mbuf *control, struct lwp *l) 308 { 309 struct in6pcb *in6p = sotoin6pcb(so); 310 int error = 0; 311 int s; 312 313 /* 314 * MAPPED_ADDR implementation info: 315 * Mapped addr support for PRU_CONTROL is not necessary. 316 * Because typical user of PRU_CONTROL is such as ifconfig, 317 * and they don't associate any addr to their socket. Then 318 * socket family is only hint about the PRU_CONTROL'ed address 319 * family, especially when getting addrs from kernel. 320 * So AF_INET socket need to be used to control AF_INET addrs, 321 * and AF_INET6 socket for AF_INET6 addrs. 322 */ 323 if (req == PRU_CONTROL) 324 return in6_control(so, (u_long)m, (void *)addr6, 325 (struct ifnet *)control, l); 326 327 if (req == PRU_PURGEIF) { 328 mutex_enter(softnet_lock); 329 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control); 330 in6_purgeif((struct ifnet *)control); 331 in6_pcbpurgeif(&udbtable, (struct ifnet *)control); 332 mutex_exit(softnet_lock); 333 return 0; 334 } 335 336 if (req == PRU_ATTACH) 337 sosetlock(so); 338 else if (in6p == NULL) { 339 error = EINVAL; 340 goto release; 341 } 342 343 switch (req) { 344 case PRU_ATTACH: 345 /* 346 * MAPPED_ADDR implementation spec: 347 * Always attach for IPv6, 348 * and only when necessary for IPv4. 349 */ 350 if (in6p != NULL) { 351 error = EINVAL; 352 break; 353 } 354 s = splsoftnet(); 355 error = in6_pcballoc(so, &udbtable); 356 splx(s); 357 if (error) 358 break; 359 error = soreserve(so, udp6_sendspace, udp6_recvspace); 360 if (error) 361 break; 362 in6p = sotoin6pcb(so); 363 in6p->in6p_cksum = -1; /* just to be sure */ 364 break; 365 366 case PRU_DETACH: 367 in6_pcbdetach(in6p); 368 break; 369 370 case PRU_BIND: 371 s = splsoftnet(); 372 error = in6_pcbbind(in6p, addr6, l); 373 splx(s); 374 break; 375 376 case PRU_CONNECT: 377 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 378 error = EISCONN; 379 break; 380 } 381 s = splsoftnet(); 382 error = in6_pcbconnect(in6p, addr6, l); 383 splx(s); 384 if (error == 0) 385 soisconnected(so); 386 break; 387 388 case PRU_DISCONNECT: 389 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 390 error = ENOTCONN; 391 break; 392 } 393 s = splsoftnet(); 394 in6_pcbdisconnect(in6p); 395 memset((void *)&in6p->in6p_laddr, 0, sizeof(in6p->in6p_laddr)); 396 splx(s); 397 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 398 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 399 break; 400 401 case PRU_SHUTDOWN: 402 socantsendmore(so); 403 break; 404 405 case PRU_SEND: 406 s = splsoftnet(); 407 error = udp6_output(in6p, m, addr6, control, l); 408 splx(s); 409 return error; 410 411 case PRU_ABORT: 412 soisdisconnected(so); 413 in6_pcbdetach(in6p); 414 break; 415 416 case PRU_SOCKADDR: 417 in6_setsockaddr(in6p, addr6); 418 break; 419 420 case PRU_PEERADDR: 421 in6_setpeeraddr(in6p, addr6); 422 break; 423 424 case PRU_SENSE: 425 /* 426 * stat: don't bother with a blocksize 427 */ 428 return 0; 429 430 case PRU_LISTEN: 431 case PRU_CONNECT2: 432 case PRU_ACCEPT: 433 case PRU_SENDOOB: 434 case PRU_FASTTIMO: 435 case PRU_SLOWTIMO: 436 case PRU_PROTORCV: 437 case PRU_PROTOSEND: 438 error = EOPNOTSUPP; 439 break; 440 441 case PRU_RCVD: 442 case PRU_RCVOOB: 443 return EOPNOTSUPP; /* do not free mbuf's */ 444 445 default: 446 panic("udp6_usrreq"); 447 } 448 449 release: 450 if (control != NULL) 451 m_freem(control); 452 if (m != NULL) 453 m_freem(m); 454 return error; 455 } 456 457 static int 458 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 459 { 460 461 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 462 } 463 464 static void 465 sysctl_net_inet6_udp6_setup(struct sysctllog **clog) 466 { 467 468 sysctl_createv(clog, 0, NULL, NULL, 469 CTLFLAG_PERMANENT, 470 CTLTYPE_NODE, "inet6", NULL, 471 NULL, 0, NULL, 0, 472 CTL_NET, PF_INET6, CTL_EOL); 473 sysctl_createv(clog, 0, NULL, NULL, 474 CTLFLAG_PERMANENT, 475 CTLTYPE_NODE, "udp6", 476 SYSCTL_DESCR("UDPv6 related settings"), 477 NULL, 0, NULL, 0, 478 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 479 480 sysctl_createv(clog, 0, NULL, NULL, 481 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 482 CTLTYPE_INT, "sendspace", 483 SYSCTL_DESCR("Default UDP send buffer size"), 484 NULL, 0, &udp6_sendspace, 0, 485 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 486 CTL_EOL); 487 sysctl_createv(clog, 0, NULL, NULL, 488 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 489 CTLTYPE_INT, "recvspace", 490 SYSCTL_DESCR("Default UDP receive buffer size"), 491 NULL, 0, &udp6_recvspace, 0, 492 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 493 CTL_EOL); 494 sysctl_createv(clog, 0, NULL, NULL, 495 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 496 CTLTYPE_INT, "do_loopback_cksum", 497 SYSCTL_DESCR("Perform UDP checksum on loopback"), 498 NULL, 0, &udp_do_loopback_cksum, 0, 499 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 500 CTL_EOL); 501 sysctl_createv(clog, 0, NULL, NULL, 502 CTLFLAG_PERMANENT, 503 CTLTYPE_STRUCT, "pcblist", 504 SYSCTL_DESCR("UDP protocol control block list"), 505 sysctl_inpcblist, 0, &udbtable, 0, 506 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 507 CTL_EOL); 508 sysctl_createv(clog, 0, NULL, NULL, 509 CTLFLAG_PERMANENT, 510 CTLTYPE_STRUCT, "stats", 511 SYSCTL_DESCR("UDPv6 statistics"), 512 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 513 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 514 CTL_EOL); 515 } 516 517 void 518 udp6_statinc(u_int stat) 519 { 520 521 KASSERT(stat < UDP6_NSTATS); 522 UDP6_STATINC(stat); 523 } 524 525 PR_WRAP_USRREQ(udp6_usrreq) 526 527 #define udp6_usrreq udp6_usrreq_wrapper 528 529 const struct pr_usrreqs udp6_usrreqs = { 530 .pr_generic = udp6_usrreq, 531 }; 532
Indexes created Wed Sep 24 15:09:51 GMT 2025