1 /* $NetBSD: udp6_usrreq.c,v 1.80 2007/11/14 22:58:27 dyoung 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 1.80 2007/11/14 22:58:27 dyoung 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/ip6protosw.h> 98 #include <netinet/in_offload.h> 99 100 #include "faith.h" 101 #if defined(NFAITH) && NFAITH > 0 102 #include <net/if_faith.h> 103 #endif 104 105 /* 106 * UDP protocol implementation. 107 * Per RFC 768, August, 1980. 108 */ 109 110 extern struct inpcbtable udbtable; 111 struct udp6stat udp6stat; 112 113 static void udp6_notify(struct in6pcb *, int); 114 115 void 116 udp6_init() 117 { 118 /* initialization done in udp_input() due to initialization order */ 119 } 120 121 /* 122 * Notify a udp user of an asynchronous error; 123 * just wake up so that he can collect error status. 124 */ 125 static void 126 udp6_notify(struct in6pcb *in6p, int errno) 127 { 128 in6p->in6p_socket->so_error = errno; 129 sorwakeup(in6p->in6p_socket); 130 sowwakeup(in6p->in6p_socket); 131 } 132 133 void 134 udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 135 { 136 struct udphdr uh; 137 struct ip6_hdr *ip6; 138 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 139 struct mbuf *m; 140 int off; 141 void *cmdarg; 142 struct ip6ctlparam *ip6cp = NULL; 143 const struct sockaddr_in6 *sa6_src = NULL; 144 void (*notify)(struct in6pcb *, int) = udp6_notify; 145 struct udp_portonly { 146 u_int16_t uh_sport; 147 u_int16_t uh_dport; 148 } *uhp; 149 150 if (sa->sa_family != AF_INET6 || 151 sa->sa_len != sizeof(struct sockaddr_in6)) 152 return; 153 154 if ((unsigned)cmd >= PRC_NCMDS) 155 return; 156 if (PRC_IS_REDIRECT(cmd)) 157 notify = in6_rtchange, d = NULL; 158 else if (cmd == PRC_HOSTDEAD) 159 d = NULL; 160 else if (cmd == PRC_MSGSIZE) { 161 /* special code is present, see below */ 162 notify = in6_rtchange; 163 } 164 else if (inet6ctlerrmap[cmd] == 0) 165 return; 166 167 /* if the parameter is from icmp6, decode it. */ 168 if (d != NULL) { 169 ip6cp = (struct ip6ctlparam *)d; 170 m = ip6cp->ip6c_m; 171 ip6 = ip6cp->ip6c_ip6; 172 off = ip6cp->ip6c_off; 173 cmdarg = ip6cp->ip6c_cmdarg; 174 sa6_src = ip6cp->ip6c_src; 175 } else { 176 m = NULL; 177 ip6 = NULL; 178 cmdarg = NULL; 179 sa6_src = &sa6_any; 180 off = 0; 181 } 182 183 if (ip6) { 184 /* 185 * XXX: We assume that when IPV6 is non NULL, 186 * M and OFF are valid. 187 */ 188 189 /* check if we can safely examine src and dst ports */ 190 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 191 if (cmd == PRC_MSGSIZE) 192 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 193 return; 194 } 195 196 bzero(&uh, sizeof(uh)); 197 m_copydata(m, off, sizeof(*uhp), (void *)&uh); 198 199 if (cmd == PRC_MSGSIZE) { 200 int valid = 0; 201 202 /* 203 * Check to see if we have a valid UDP socket 204 * corresponding to the address in the ICMPv6 message 205 * payload. 206 */ 207 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr, 208 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, 209 uh.uh_sport, 0)) 210 valid++; 211 #if 0 212 /* 213 * As the use of sendto(2) is fairly popular, 214 * we may want to allow non-connected pcb too. 215 * But it could be too weak against attacks... 216 * We should at least check if the local address (= s) 217 * is really ours. 218 */ 219 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr, 220 uh.uh_dport, 0)) 221 valid++; 222 #endif 223 224 /* 225 * Depending on the value of "valid" and routing table 226 * size (mtudisc_{hi,lo}wat), we will: 227 * - recalculate the new MTU and create the 228 * corresponding routing entry, or 229 * - ignore the MTU change notification. 230 */ 231 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 232 233 /* 234 * regardless of if we called 235 * icmp6_mtudisc_update(), we need to call 236 * in6_pcbnotify(), to notify path MTU change 237 * to the userland (RFC3542), because some 238 * unconnected sockets may share the same 239 * destination and want to know the path MTU. 240 */ 241 } 242 243 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, 244 (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 245 notify); 246 } else { 247 (void) in6_pcbnotify(&udbtable, sa, 0, 248 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 249 } 250 } 251 252 extern int udp6_sendspace; 253 extern int udp6_recvspace; 254 255 int 256 udp6_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr6, 257 struct mbuf *control, struct lwp *l) 258 { 259 struct in6pcb *in6p = sotoin6pcb(so); 260 int error = 0; 261 int s; 262 263 /* 264 * MAPPED_ADDR implementation info: 265 * Mapped addr support for PRU_CONTROL is not necessary. 266 * Because typical user of PRU_CONTROL is such as ifconfig, 267 * and they don't associate any addr to their socket. Then 268 * socket family is only hint about the PRU_CONTROL'ed address 269 * family, especially when getting addrs from kernel. 270 * So AF_INET socket need to be used to control AF_INET addrs, 271 * and AF_INET6 socket for AF_INET6 addrs. 272 */ 273 if (req == PRU_CONTROL) 274 return in6_control(so, (u_long)m, (void *)addr6, 275 (struct ifnet *)control, l); 276 277 if (req == PRU_PURGEIF) { 278 s = splsoftnet(); 279 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control); 280 in6_purgeif((struct ifnet *)control); 281 in6_pcbpurgeif(&udbtable, (struct ifnet *)control); 282 splx(s); 283 return 0; 284 } 285 286 if (in6p == NULL && req != PRU_ATTACH) { 287 error = EINVAL; 288 goto release; 289 } 290 291 switch (req) { 292 case PRU_ATTACH: 293 /* 294 * MAPPED_ADDR implementation spec: 295 * Always attach for IPv6, 296 * and only when necessary for IPv4. 297 */ 298 if (in6p != NULL) { 299 error = EINVAL; 300 break; 301 } 302 s = splsoftnet(); 303 error = in6_pcballoc(so, &udbtable); 304 splx(s); 305 if (error) 306 break; 307 error = soreserve(so, udp6_sendspace, udp6_recvspace); 308 if (error) 309 break; 310 in6p = sotoin6pcb(so); 311 in6p->in6p_cksum = -1; /* just to be sure */ 312 break; 313 314 case PRU_DETACH: 315 in6_pcbdetach(in6p); 316 break; 317 318 case PRU_BIND: 319 s = splsoftnet(); 320 error = in6_pcbbind(in6p, addr6, l); 321 splx(s); 322 break; 323 324 case PRU_CONNECT: 325 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 326 error = EISCONN; 327 break; 328 } 329 s = splsoftnet(); 330 error = in6_pcbconnect(in6p, addr6, l); 331 splx(s); 332 if (error == 0) 333 soisconnected(so); 334 break; 335 336 case PRU_DISCONNECT: 337 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 338 error = ENOTCONN; 339 break; 340 } 341 s = splsoftnet(); 342 in6_pcbdisconnect(in6p); 343 bzero((void *)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr)); 344 splx(s); 345 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 346 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 347 break; 348 349 case PRU_SHUTDOWN: 350 socantsendmore(so); 351 break; 352 353 case PRU_SEND: 354 s = splsoftnet(); 355 error = udp6_output(in6p, m, addr6, control, l); 356 splx(s); 357 return error; 358 359 case PRU_ABORT: 360 soisdisconnected(so); 361 in6_pcbdetach(in6p); 362 break; 363 364 case PRU_SOCKADDR: 365 in6_setsockaddr(in6p, addr6); 366 break; 367 368 case PRU_PEERADDR: 369 in6_setpeeraddr(in6p, addr6); 370 break; 371 372 case PRU_SENSE: 373 /* 374 * stat: don't bother with a blocksize 375 */ 376 return 0; 377 378 case PRU_LISTEN: 379 case PRU_CONNECT2: 380 case PRU_ACCEPT: 381 case PRU_SENDOOB: 382 case PRU_FASTTIMO: 383 case PRU_SLOWTIMO: 384 case PRU_PROTORCV: 385 case PRU_PROTOSEND: 386 error = EOPNOTSUPP; 387 break; 388 389 case PRU_RCVD: 390 case PRU_RCVOOB: 391 return EOPNOTSUPP; /* do not free mbuf's */ 392 393 default: 394 panic("udp6_usrreq"); 395 } 396 397 release: 398 if (control != NULL) 399 m_freem(control); 400 if (m != NULL) 401 m_freem(m); 402 return error; 403 } 404 405 SYSCTL_SETUP(sysctl_net_inet6_udp6_setup, "sysctl net.inet6.udp6 subtree setup") 406 { 407 sysctl_createv(clog, 0, NULL, NULL, 408 CTLFLAG_PERMANENT, 409 CTLTYPE_NODE, "net", NULL, 410 NULL, 0, NULL, 0, 411 CTL_NET, CTL_EOL); 412 sysctl_createv(clog, 0, NULL, NULL, 413 CTLFLAG_PERMANENT, 414 CTLTYPE_NODE, "inet6", NULL, 415 NULL, 0, NULL, 0, 416 CTL_NET, PF_INET6, CTL_EOL); 417 sysctl_createv(clog, 0, NULL, NULL, 418 CTLFLAG_PERMANENT, 419 CTLTYPE_NODE, "udp6", 420 SYSCTL_DESCR("UDPv6 related settings"), 421 NULL, 0, NULL, 0, 422 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 423 424 sysctl_createv(clog, 0, NULL, NULL, 425 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 426 CTLTYPE_INT, "sendspace", 427 SYSCTL_DESCR("Default UDP send buffer size"), 428 NULL, 0, &udp6_sendspace, 0, 429 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 430 CTL_EOL); 431 sysctl_createv(clog, 0, NULL, NULL, 432 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 433 CTLTYPE_INT, "recvspace", 434 SYSCTL_DESCR("Default UDP receive buffer size"), 435 NULL, 0, &udp6_recvspace, 0, 436 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 437 CTL_EOL); 438 sysctl_createv(clog, 0, NULL, NULL, 439 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 440 CTLTYPE_INT, "do_loopback_cksum", 441 SYSCTL_DESCR("Perform UDP checksum on loopback"), 442 NULL, 0, &udp_do_loopback_cksum, 0, 443 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 444 CTL_EOL); 445 sysctl_createv(clog, 0, NULL, NULL, 446 CTLFLAG_PERMANENT, 447 CTLTYPE_STRUCT, "pcblist", 448 SYSCTL_DESCR("UDP protocol control block list"), 449 sysctl_inpcblist, 0, &udbtable, 0, 450 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 451 CTL_EOL); 452 sysctl_createv(clog, 0, NULL, NULL, 453 CTLFLAG_PERMANENT, 454 CTLTYPE_STRUCT, "stats", 455 SYSCTL_DESCR("UDPv6 statistics"), 456 NULL, 0, &udp6stat, sizeof(udp6stat), 457 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 458 CTL_EOL); 459 } 460