1 /* $NetBSD: udp6_usrreq.c,v 1.86 2008/05/04 07:22:15 thorpej 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 1.86 2008/05/04 07:22:15 thorpej Exp $"); 66 67 #include <sys/param.h> 68 #include <sys/malloc.h> 69 #include <sys/mbuf.h> 70 #include <sys/protosw.h> 71 #include <sys/socket.h> 72 #include <sys/socketvar.h> 73 #include <sys/errno.h> 74 #include <sys/stat.h> 75 #include <sys/systm.h> 76 #include <sys/proc.h> 77 #include <sys/syslog.h> 78 #include <sys/sysctl.h> 79 80 #include <net/if.h> 81 #include <net/route.h> 82 #include <net/if_types.h> 83 84 #include <netinet/in.h> 85 #include <netinet/in_var.h> 86 #include <netinet/in_systm.h> 87 #include <netinet/ip.h> 88 #include <netinet/ip_var.h> 89 #include <netinet/in_pcb.h> 90 #include <netinet/udp.h> 91 #include <netinet/udp_var.h> 92 #include <netinet/ip6.h> 93 #include <netinet6/ip6_var.h> 94 #include <netinet6/in6_pcb.h> 95 #include <netinet/icmp6.h> 96 #include <netinet6/udp6_var.h> 97 #include <netinet6/udp6_private.h> 98 #include <netinet6/ip6protosw.h> 99 #include <netinet/in_offload.h> 100 101 #include "faith.h" 102 #if defined(NFAITH) && NFAITH > 0 103 #include <net/if_faith.h> 104 #endif 105 106 /* 107 * UDP protocol implementation. 108 * Per RFC 768, August, 1980. 109 */ 110 111 extern struct inpcbtable udbtable; 112 113 percpu_t *udp6stat_percpu; 114 115 static void udp6_notify(struct in6pcb *, int); 116 117 void 118 udp6_init(void) 119 { 120 /* initialization done in udp_init() due to initialization order */ 121 } 122 123 /* 124 * Notify a udp user of an asynchronous error; 125 * just wake up so that he can collect error status. 126 */ 127 static void 128 udp6_notify(struct in6pcb *in6p, int errno) 129 { 130 in6p->in6p_socket->so_error = errno; 131 sorwakeup(in6p->in6p_socket); 132 sowwakeup(in6p->in6p_socket); 133 } 134 135 void * 136 udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 137 { 138 struct udphdr uh; 139 struct ip6_hdr *ip6; 140 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 141 struct mbuf *m; 142 int off; 143 void *cmdarg; 144 struct ip6ctlparam *ip6cp = NULL; 145 const struct sockaddr_in6 *sa6_src = NULL; 146 void (*notify)(struct in6pcb *, int) = udp6_notify; 147 struct udp_portonly { 148 u_int16_t uh_sport; 149 u_int16_t uh_dport; 150 } *uhp; 151 152 if (sa->sa_family != AF_INET6 || 153 sa->sa_len != sizeof(struct sockaddr_in6)) 154 return NULL; 155 156 if ((unsigned)cmd >= PRC_NCMDS) 157 return NULL; 158 if (PRC_IS_REDIRECT(cmd)) 159 notify = in6_rtchange, d = NULL; 160 else if (cmd == PRC_HOSTDEAD) 161 d = NULL; 162 else if (cmd == PRC_MSGSIZE) { 163 /* special code is present, see below */ 164 notify = in6_rtchange; 165 } 166 else if (inet6ctlerrmap[cmd] == 0) 167 return NULL; 168 169 /* if the parameter is from icmp6, decode it. */ 170 if (d != NULL) { 171 ip6cp = (struct ip6ctlparam *)d; 172 m = ip6cp->ip6c_m; 173 ip6 = ip6cp->ip6c_ip6; 174 off = ip6cp->ip6c_off; 175 cmdarg = ip6cp->ip6c_cmdarg; 176 sa6_src = ip6cp->ip6c_src; 177 } else { 178 m = NULL; 179 ip6 = NULL; 180 cmdarg = NULL; 181 sa6_src = &sa6_any; 182 off = 0; 183 } 184 185 if (ip6) { 186 /* 187 * XXX: We assume that when IPV6 is non NULL, 188 * M and OFF are valid. 189 */ 190 191 /* check if we can safely examine src and dst ports */ 192 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 193 if (cmd == PRC_MSGSIZE) 194 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 195 return NULL; 196 } 197 198 bzero(&uh, sizeof(uh)); 199 m_copydata(m, off, sizeof(*uhp), (void *)&uh); 200 201 if (cmd == PRC_MSGSIZE) { 202 int valid = 0; 203 204 /* 205 * Check to see if we have a valid UDP socket 206 * corresponding to the address in the ICMPv6 message 207 * payload. 208 */ 209 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr, 210 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, 211 uh.uh_sport, 0)) 212 valid++; 213 #if 0 214 /* 215 * As the use of sendto(2) is fairly popular, 216 * we may want to allow non-connected pcb too. 217 * But it could be too weak against attacks... 218 * We should at least check if the local address (= s) 219 * is really ours. 220 */ 221 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr, 222 uh.uh_dport, 0)) 223 valid++; 224 #endif 225 226 /* 227 * Depending on the value of "valid" and routing table 228 * size (mtudisc_{hi,lo}wat), we will: 229 * - recalculate the new MTU and create the 230 * corresponding routing entry, or 231 * - ignore the MTU change notification. 232 */ 233 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 234 235 /* 236 * regardless of if we called 237 * icmp6_mtudisc_update(), we need to call 238 * in6_pcbnotify(), to notify path MTU change 239 * to the userland (RFC3542), because some 240 * unconnected sockets may share the same 241 * destination and want to know the path MTU. 242 */ 243 } 244 245 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, 246 (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 247 notify); 248 } else { 249 (void) in6_pcbnotify(&udbtable, sa, 0, 250 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 251 } 252 return NULL; 253 } 254 255 extern int udp6_sendspace; 256 extern int udp6_recvspace; 257 258 int 259 udp6_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr6, 260 struct mbuf *control, struct lwp *l) 261 { 262 struct in6pcb *in6p = sotoin6pcb(so); 263 int error = 0; 264 int s; 265 266 /* 267 * MAPPED_ADDR implementation info: 268 * Mapped addr support for PRU_CONTROL is not necessary. 269 * Because typical user of PRU_CONTROL is such as ifconfig, 270 * and they don't associate any addr to their socket. Then 271 * socket family is only hint about the PRU_CONTROL'ed address 272 * family, especially when getting addrs from kernel. 273 * So AF_INET socket need to be used to control AF_INET addrs, 274 * and AF_INET6 socket for AF_INET6 addrs. 275 */ 276 if (req == PRU_CONTROL) 277 return in6_control(so, (u_long)m, (void *)addr6, 278 (struct ifnet *)control, l); 279 280 if (req == PRU_PURGEIF) { 281 mutex_enter(softnet_lock); 282 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control); 283 in6_purgeif((struct ifnet *)control); 284 in6_pcbpurgeif(&udbtable, (struct ifnet *)control); 285 mutex_exit(softnet_lock); 286 return 0; 287 } 288 289 if (req == PRU_ATTACH) 290 sosetlock(so); 291 else if (in6p == NULL) { 292 error = EINVAL; 293 goto release; 294 } 295 296 switch (req) { 297 case PRU_ATTACH: 298 /* 299 * MAPPED_ADDR implementation spec: 300 * Always attach for IPv6, 301 * and only when necessary for IPv4. 302 */ 303 if (in6p != NULL) { 304 error = EINVAL; 305 break; 306 } 307 s = splsoftnet(); 308 error = in6_pcballoc(so, &udbtable); 309 splx(s); 310 if (error) 311 break; 312 error = soreserve(so, udp6_sendspace, udp6_recvspace); 313 if (error) 314 break; 315 in6p = sotoin6pcb(so); 316 in6p->in6p_cksum = -1; /* just to be sure */ 317 break; 318 319 case PRU_DETACH: 320 in6_pcbdetach(in6p); 321 break; 322 323 case PRU_BIND: 324 s = splsoftnet(); 325 error = in6_pcbbind(in6p, addr6, l); 326 splx(s); 327 break; 328 329 case PRU_CONNECT: 330 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 331 error = EISCONN; 332 break; 333 } 334 s = splsoftnet(); 335 error = in6_pcbconnect(in6p, addr6, l); 336 splx(s); 337 if (error == 0) 338 soisconnected(so); 339 break; 340 341 case PRU_DISCONNECT: 342 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 343 error = ENOTCONN; 344 break; 345 } 346 s = splsoftnet(); 347 in6_pcbdisconnect(in6p); 348 bzero((void *)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr)); 349 splx(s); 350 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 351 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 352 break; 353 354 case PRU_SHUTDOWN: 355 socantsendmore(so); 356 break; 357 358 case PRU_SEND: 359 s = splsoftnet(); 360 error = udp6_output(in6p, m, addr6, control, l); 361 splx(s); 362 return error; 363 364 case PRU_ABORT: 365 soisdisconnected(so); 366 in6_pcbdetach(in6p); 367 break; 368 369 case PRU_SOCKADDR: 370 in6_setsockaddr(in6p, addr6); 371 break; 372 373 case PRU_PEERADDR: 374 in6_setpeeraddr(in6p, addr6); 375 break; 376 377 case PRU_SENSE: 378 /* 379 * stat: don't bother with a blocksize 380 */ 381 return 0; 382 383 case PRU_LISTEN: 384 case PRU_CONNECT2: 385 case PRU_ACCEPT: 386 case PRU_SENDOOB: 387 case PRU_FASTTIMO: 388 case PRU_SLOWTIMO: 389 case PRU_PROTORCV: 390 case PRU_PROTOSEND: 391 error = EOPNOTSUPP; 392 break; 393 394 case PRU_RCVD: 395 case PRU_RCVOOB: 396 return EOPNOTSUPP; /* do not free mbuf's */ 397 398 default: 399 panic("udp6_usrreq"); 400 } 401 402 release: 403 if (control != NULL) 404 m_freem(control); 405 if (m != NULL) 406 m_freem(m); 407 return error; 408 } 409 410 static int 411 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 412 { 413 414 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 415 } 416 417 SYSCTL_SETUP(sysctl_net_inet6_udp6_setup, "sysctl net.inet6.udp6 subtree setup") 418 { 419 sysctl_createv(clog, 0, NULL, NULL, 420 CTLFLAG_PERMANENT, 421 CTLTYPE_NODE, "net", NULL, 422 NULL, 0, NULL, 0, 423 CTL_NET, CTL_EOL); 424 sysctl_createv(clog, 0, NULL, NULL, 425 CTLFLAG_PERMANENT, 426 CTLTYPE_NODE, "inet6", NULL, 427 NULL, 0, NULL, 0, 428 CTL_NET, PF_INET6, CTL_EOL); 429 sysctl_createv(clog, 0, NULL, NULL, 430 CTLFLAG_PERMANENT, 431 CTLTYPE_NODE, "udp6", 432 SYSCTL_DESCR("UDPv6 related settings"), 433 NULL, 0, NULL, 0, 434 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 435 436 sysctl_createv(clog, 0, NULL, NULL, 437 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 438 CTLTYPE_INT, "sendspace", 439 SYSCTL_DESCR("Default UDP send buffer size"), 440 NULL, 0, &udp6_sendspace, 0, 441 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 442 CTL_EOL); 443 sysctl_createv(clog, 0, NULL, NULL, 444 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 445 CTLTYPE_INT, "recvspace", 446 SYSCTL_DESCR("Default UDP receive buffer size"), 447 NULL, 0, &udp6_recvspace, 0, 448 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 449 CTL_EOL); 450 sysctl_createv(clog, 0, NULL, NULL, 451 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 452 CTLTYPE_INT, "do_loopback_cksum", 453 SYSCTL_DESCR("Perform UDP checksum on loopback"), 454 NULL, 0, &udp_do_loopback_cksum, 0, 455 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 456 CTL_EOL); 457 sysctl_createv(clog, 0, NULL, NULL, 458 CTLFLAG_PERMANENT, 459 CTLTYPE_STRUCT, "pcblist", 460 SYSCTL_DESCR("UDP protocol control block list"), 461 sysctl_inpcblist, 0, &udbtable, 0, 462 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 463 CTL_EOL); 464 sysctl_createv(clog, 0, NULL, NULL, 465 CTLFLAG_PERMANENT, 466 CTLTYPE_STRUCT, "stats", 467 SYSCTL_DESCR("UDPv6 statistics"), 468 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 469 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 470 CTL_EOL); 471 } 472 473 void 474 udp6_statinc(u_int stat) 475 { 476 477 KASSERT(stat < UDP6_NSTATS); 478 UDP6_STATINC(stat); 479 } 480