1 /* $NetBSD: udp6_usrreq.c,v 1.88 2009/09/16 15:23:05 pooka 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 1.88 2009/09/16 15:23:05 pooka 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 static void sysctl_net_inet6_udp6_setup(struct sysctllog **); 117 118 void 119 udp6_init(void) 120 { 121 122 sysctl_net_inet6_udp6_setup(NULL); 123 } 124 125 /* 126 * Notify a udp user of an asynchronous error; 127 * just wake up so that he can collect error status. 128 */ 129 static void 130 udp6_notify(struct in6pcb *in6p, int errno) 131 { 132 in6p->in6p_socket->so_error = errno; 133 sorwakeup(in6p->in6p_socket); 134 sowwakeup(in6p->in6p_socket); 135 } 136 137 void * 138 udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 139 { 140 struct udphdr uh; 141 struct ip6_hdr *ip6; 142 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 143 struct mbuf *m; 144 int off; 145 void *cmdarg; 146 struct ip6ctlparam *ip6cp = NULL; 147 const struct sockaddr_in6 *sa6_src = NULL; 148 void (*notify)(struct in6pcb *, int) = udp6_notify; 149 struct udp_portonly { 150 u_int16_t uh_sport; 151 u_int16_t uh_dport; 152 } *uhp; 153 154 if (sa->sa_family != AF_INET6 || 155 sa->sa_len != sizeof(struct sockaddr_in6)) 156 return NULL; 157 158 if ((unsigned)cmd >= PRC_NCMDS) 159 return NULL; 160 if (PRC_IS_REDIRECT(cmd)) 161 notify = in6_rtchange, d = NULL; 162 else if (cmd == PRC_HOSTDEAD) 163 d = NULL; 164 else if (cmd == PRC_MSGSIZE) { 165 /* special code is present, see below */ 166 notify = in6_rtchange; 167 } 168 else if (inet6ctlerrmap[cmd] == 0) 169 return NULL; 170 171 /* if the parameter is from icmp6, decode it. */ 172 if (d != NULL) { 173 ip6cp = (struct ip6ctlparam *)d; 174 m = ip6cp->ip6c_m; 175 ip6 = ip6cp->ip6c_ip6; 176 off = ip6cp->ip6c_off; 177 cmdarg = ip6cp->ip6c_cmdarg; 178 sa6_src = ip6cp->ip6c_src; 179 } else { 180 m = NULL; 181 ip6 = NULL; 182 cmdarg = NULL; 183 sa6_src = &sa6_any; 184 off = 0; 185 } 186 187 if (ip6) { 188 /* 189 * XXX: We assume that when IPV6 is non NULL, 190 * M and OFF are valid. 191 */ 192 193 /* check if we can safely examine src and dst ports */ 194 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 195 if (cmd == PRC_MSGSIZE) 196 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 197 return NULL; 198 } 199 200 memset(&uh, 0, sizeof(uh)); 201 m_copydata(m, off, sizeof(*uhp), (void *)&uh); 202 203 if (cmd == PRC_MSGSIZE) { 204 int valid = 0; 205 206 /* 207 * Check to see if we have a valid UDP socket 208 * corresponding to the address in the ICMPv6 message 209 * payload. 210 */ 211 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr, 212 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, 213 uh.uh_sport, 0)) 214 valid++; 215 #if 0 216 /* 217 * As the use of sendto(2) is fairly popular, 218 * we may want to allow non-connected pcb too. 219 * But it could be too weak against attacks... 220 * We should at least check if the local address (= s) 221 * is really ours. 222 */ 223 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr, 224 uh.uh_dport, 0)) 225 valid++; 226 #endif 227 228 /* 229 * Depending on the value of "valid" and routing table 230 * size (mtudisc_{hi,lo}wat), we will: 231 * - recalculate the new MTU and create the 232 * corresponding routing entry, or 233 * - ignore the MTU change notification. 234 */ 235 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 236 237 /* 238 * regardless of if we called 239 * icmp6_mtudisc_update(), we need to call 240 * in6_pcbnotify(), to notify path MTU change 241 * to the userland (RFC3542), because some 242 * unconnected sockets may share the same 243 * destination and want to know the path MTU. 244 */ 245 } 246 247 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, 248 (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 249 notify); 250 } else { 251 (void) in6_pcbnotify(&udbtable, sa, 0, 252 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 253 } 254 return NULL; 255 } 256 257 extern int udp6_sendspace; 258 extern int udp6_recvspace; 259 260 int 261 udp6_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr6, 262 struct mbuf *control, struct lwp *l) 263 { 264 struct in6pcb *in6p = sotoin6pcb(so); 265 int error = 0; 266 int s; 267 268 /* 269 * MAPPED_ADDR implementation info: 270 * Mapped addr support for PRU_CONTROL is not necessary. 271 * Because typical user of PRU_CONTROL is such as ifconfig, 272 * and they don't associate any addr to their socket. Then 273 * socket family is only hint about the PRU_CONTROL'ed address 274 * family, especially when getting addrs from kernel. 275 * So AF_INET socket need to be used to control AF_INET addrs, 276 * and AF_INET6 socket for AF_INET6 addrs. 277 */ 278 if (req == PRU_CONTROL) 279 return in6_control(so, (u_long)m, (void *)addr6, 280 (struct ifnet *)control, l); 281 282 if (req == PRU_PURGEIF) { 283 mutex_enter(softnet_lock); 284 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control); 285 in6_purgeif((struct ifnet *)control); 286 in6_pcbpurgeif(&udbtable, (struct ifnet *)control); 287 mutex_exit(softnet_lock); 288 return 0; 289 } 290 291 if (req == PRU_ATTACH) 292 sosetlock(so); 293 else if (in6p == NULL) { 294 error = EINVAL; 295 goto release; 296 } 297 298 switch (req) { 299 case PRU_ATTACH: 300 /* 301 * MAPPED_ADDR implementation spec: 302 * Always attach for IPv6, 303 * and only when necessary for IPv4. 304 */ 305 if (in6p != NULL) { 306 error = EINVAL; 307 break; 308 } 309 s = splsoftnet(); 310 error = in6_pcballoc(so, &udbtable); 311 splx(s); 312 if (error) 313 break; 314 error = soreserve(so, udp6_sendspace, udp6_recvspace); 315 if (error) 316 break; 317 in6p = sotoin6pcb(so); 318 in6p->in6p_cksum = -1; /* just to be sure */ 319 break; 320 321 case PRU_DETACH: 322 in6_pcbdetach(in6p); 323 break; 324 325 case PRU_BIND: 326 s = splsoftnet(); 327 error = in6_pcbbind(in6p, addr6, l); 328 splx(s); 329 break; 330 331 case PRU_CONNECT: 332 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 333 error = EISCONN; 334 break; 335 } 336 s = splsoftnet(); 337 error = in6_pcbconnect(in6p, addr6, l); 338 splx(s); 339 if (error == 0) 340 soisconnected(so); 341 break; 342 343 case PRU_DISCONNECT: 344 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 345 error = ENOTCONN; 346 break; 347 } 348 s = splsoftnet(); 349 in6_pcbdisconnect(in6p); 350 memset((void *)&in6p->in6p_laddr, 0, sizeof(in6p->in6p_laddr)); 351 splx(s); 352 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 353 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 354 break; 355 356 case PRU_SHUTDOWN: 357 socantsendmore(so); 358 break; 359 360 case PRU_SEND: 361 s = splsoftnet(); 362 error = udp6_output(in6p, m, addr6, control, l); 363 splx(s); 364 return error; 365 366 case PRU_ABORT: 367 soisdisconnected(so); 368 in6_pcbdetach(in6p); 369 break; 370 371 case PRU_SOCKADDR: 372 in6_setsockaddr(in6p, addr6); 373 break; 374 375 case PRU_PEERADDR: 376 in6_setpeeraddr(in6p, addr6); 377 break; 378 379 case PRU_SENSE: 380 /* 381 * stat: don't bother with a blocksize 382 */ 383 return 0; 384 385 case PRU_LISTEN: 386 case PRU_CONNECT2: 387 case PRU_ACCEPT: 388 case PRU_SENDOOB: 389 case PRU_FASTTIMO: 390 case PRU_SLOWTIMO: 391 case PRU_PROTORCV: 392 case PRU_PROTOSEND: 393 error = EOPNOTSUPP; 394 break; 395 396 case PRU_RCVD: 397 case PRU_RCVOOB: 398 return EOPNOTSUPP; /* do not free mbuf's */ 399 400 default: 401 panic("udp6_usrreq"); 402 } 403 404 release: 405 if (control != NULL) 406 m_freem(control); 407 if (m != NULL) 408 m_freem(m); 409 return error; 410 } 411 412 static int 413 sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS) 414 { 415 416 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS)); 417 } 418 419 static void 420 sysctl_net_inet6_udp6_setup(struct sysctllog **clog) 421 { 422 sysctl_createv(clog, 0, NULL, NULL, 423 CTLFLAG_PERMANENT, 424 CTLTYPE_NODE, "net", NULL, 425 NULL, 0, NULL, 0, 426 CTL_NET, CTL_EOL); 427 sysctl_createv(clog, 0, NULL, NULL, 428 CTLFLAG_PERMANENT, 429 CTLTYPE_NODE, "inet6", NULL, 430 NULL, 0, NULL, 0, 431 CTL_NET, PF_INET6, CTL_EOL); 432 sysctl_createv(clog, 0, NULL, NULL, 433 CTLFLAG_PERMANENT, 434 CTLTYPE_NODE, "udp6", 435 SYSCTL_DESCR("UDPv6 related settings"), 436 NULL, 0, NULL, 0, 437 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 438 439 sysctl_createv(clog, 0, NULL, NULL, 440 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 441 CTLTYPE_INT, "sendspace", 442 SYSCTL_DESCR("Default UDP send buffer size"), 443 NULL, 0, &udp6_sendspace, 0, 444 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 445 CTL_EOL); 446 sysctl_createv(clog, 0, NULL, NULL, 447 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 448 CTLTYPE_INT, "recvspace", 449 SYSCTL_DESCR("Default UDP receive buffer size"), 450 NULL, 0, &udp6_recvspace, 0, 451 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 452 CTL_EOL); 453 sysctl_createv(clog, 0, NULL, NULL, 454 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 455 CTLTYPE_INT, "do_loopback_cksum", 456 SYSCTL_DESCR("Perform UDP checksum on loopback"), 457 NULL, 0, &udp_do_loopback_cksum, 0, 458 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 459 CTL_EOL); 460 sysctl_createv(clog, 0, NULL, NULL, 461 CTLFLAG_PERMANENT, 462 CTLTYPE_STRUCT, "pcblist", 463 SYSCTL_DESCR("UDP protocol control block list"), 464 sysctl_inpcblist, 0, &udbtable, 0, 465 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 466 CTL_EOL); 467 sysctl_createv(clog, 0, NULL, NULL, 468 CTLFLAG_PERMANENT, 469 CTLTYPE_STRUCT, "stats", 470 SYSCTL_DESCR("UDPv6 statistics"), 471 sysctl_net_inet6_udp6_stats, 0, NULL, 0, 472 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 473 CTL_EOL); 474 } 475 476 void 477 udp6_statinc(u_int stat) 478 { 479 480 KASSERT(stat < UDP6_NSTATS); 481 UDP6_STATINC(stat); 482 } 483