Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/udp6_usrreq.c
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1 /* $NetBSD: udp6_usrreq.c,v 1.75 2006/07/23 22:06:13 ad 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 1.75 2006/07/23 22:06:13 ad 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 __P((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(in6p, errno) 127 struct in6pcb *in6p; 128 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(cmd, sa, d) 137 int cmd; 138 struct sockaddr *sa; 139 void *d; 140 { 141 struct udphdr uh; 142 struct ip6_hdr *ip6; 143 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa; 144 struct mbuf *m; 145 int off; 146 void *cmdarg; 147 struct ip6ctlparam *ip6cp = NULL; 148 const struct sockaddr_in6 *sa6_src = NULL; 149 void (*notify) __P((struct in6pcb *, int)) = udp6_notify; 150 struct udp_portonly { 151 u_int16_t uh_sport; 152 u_int16_t uh_dport; 153 } *uhp; 154 155 if (sa->sa_family != AF_INET6 || 156 sa->sa_len != sizeof(struct sockaddr_in6)) 157 return; 158 159 if ((unsigned)cmd >= PRC_NCMDS) 160 return; 161 if (PRC_IS_REDIRECT(cmd)) 162 notify = in6_rtchange, d = NULL; 163 else if (cmd == PRC_HOSTDEAD) 164 d = NULL; 165 else if (cmd == PRC_MSGSIZE) { 166 /* special code is present, see below */ 167 notify = in6_rtchange; 168 } 169 else if (inet6ctlerrmap[cmd] == 0) 170 return; 171 172 /* if the parameter is from icmp6, decode it. */ 173 if (d != NULL) { 174 ip6cp = (struct ip6ctlparam *)d; 175 m = ip6cp->ip6c_m; 176 ip6 = ip6cp->ip6c_ip6; 177 off = ip6cp->ip6c_off; 178 cmdarg = ip6cp->ip6c_cmdarg; 179 sa6_src = ip6cp->ip6c_src; 180 } else { 181 m = NULL; 182 ip6 = NULL; 183 cmdarg = NULL; 184 sa6_src = &sa6_any; 185 off = 0; 186 } 187 188 if (ip6) { 189 /* 190 * XXX: We assume that when IPV6 is non NULL, 191 * M and OFF are valid. 192 */ 193 194 /* check if we can safely examine src and dst ports */ 195 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 196 if (cmd == PRC_MSGSIZE) 197 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 198 return; 199 } 200 201 bzero(&uh, sizeof(uh)); 202 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 203 204 if (cmd == PRC_MSGSIZE) { 205 int valid = 0; 206 207 /* 208 * Check to see if we have a valid UDP socket 209 * corresponding to the address in the ICMPv6 message 210 * payload. 211 */ 212 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr, 213 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, 214 uh.uh_sport, 0)) 215 valid++; 216 #if 0 217 /* 218 * As the use of sendto(2) is fairly popular, 219 * we may want to allow non-connected pcb too. 220 * But it could be too weak against attacks... 221 * We should at least check if the local address (= s) 222 * is really ours. 223 */ 224 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr, 225 uh.uh_dport, 0)) 226 valid++; 227 #endif 228 229 /* 230 * Depending on the value of "valid" and routing table 231 * size (mtudisc_{hi,lo}wat), we will: 232 * - recalculate the new MTU and create the 233 * corresponding routing entry, or 234 * - ignore the MTU change notification. 235 */ 236 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 237 238 /* 239 * regardless of if we called 240 * icmp6_mtudisc_update(), we need to call 241 * in6_pcbnotify(), to notify path MTU change 242 * to the userland (RFC3542), because some 243 * unconnected sockets may share the same 244 * destination and want to know the path MTU. 245 */ 246 } 247 248 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, 249 (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 250 notify); 251 } else { 252 (void) in6_pcbnotify(&udbtable, sa, 0, 253 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 254 } 255 } 256 257 extern int udp6_sendspace; 258 extern int udp6_recvspace; 259 260 int 261 udp6_usrreq(so, req, m, addr6, control, l) 262 struct socket *so; 263 int req; 264 struct mbuf *m, *addr6, *control; 265 struct lwp *l; 266 { 267 struct in6pcb *in6p = sotoin6pcb(so); 268 int error = 0; 269 int s; 270 271 /* 272 * MAPPED_ADDR implementation info: 273 * Mapped addr support for PRU_CONTROL is not necessary. 274 * Because typical user of PRU_CONTROL is such as ifconfig, 275 * and they don't associate any addr to their socket. Then 276 * socket family is only hint about the PRU_CONTROL'ed address 277 * family, especially when getting addrs from kernel. 278 * So AF_INET socket need to be used to control AF_INET addrs, 279 * and AF_INET6 socket for AF_INET6 addrs. 280 */ 281 if (req == PRU_CONTROL) 282 return (in6_control(so, (u_long)m, (caddr_t)addr6, 283 (struct ifnet *)control, l)); 284 285 if (req == PRU_PURGEIF) { 286 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control); 287 in6_purgeif((struct ifnet *)control); 288 in6_pcbpurgeif(&udbtable, (struct ifnet *)control); 289 return (0); 290 } 291 292 if (in6p == NULL && req != PRU_ATTACH) { 293 error = EINVAL; 294 goto release; 295 } 296 297 switch (req) { 298 case PRU_ATTACH: 299 /* 300 * MAPPED_ADDR implementation spec: 301 * Always attach for IPv6, 302 * and only when necessary for IPv4. 303 */ 304 if (in6p != NULL) { 305 error = EINVAL; 306 break; 307 } 308 s = splsoftnet(); 309 error = in6_pcballoc(so, &udbtable); 310 splx(s); 311 if (error) 312 break; 313 error = soreserve(so, udp6_sendspace, udp6_recvspace); 314 if (error) 315 break; 316 in6p = sotoin6pcb(so); 317 in6p->in6p_cksum = -1; /* just to be sure */ 318 break; 319 320 case PRU_DETACH: 321 in6_pcbdetach(in6p); 322 break; 323 324 case PRU_BIND: 325 s = splsoftnet(); 326 error = in6_pcbbind(in6p, addr6, l); 327 splx(s); 328 break; 329 330 case PRU_LISTEN: 331 error = EOPNOTSUPP; 332 break; 333 334 case PRU_CONNECT: 335 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 336 error = EISCONN; 337 break; 338 } 339 s = splsoftnet(); 340 error = in6_pcbconnect(in6p, addr6, l); 341 splx(s); 342 if (error == 0) 343 soisconnected(so); 344 break; 345 346 case PRU_CONNECT2: 347 error = EOPNOTSUPP; 348 break; 349 350 case PRU_ACCEPT: 351 error = EOPNOTSUPP; 352 break; 353 354 case PRU_DISCONNECT: 355 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 356 error = ENOTCONN; 357 break; 358 } 359 s = splsoftnet(); 360 in6_pcbdisconnect(in6p); 361 bzero((caddr_t)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr)); 362 splx(s); 363 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 364 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 365 break; 366 367 case PRU_SHUTDOWN: 368 socantsendmore(so); 369 break; 370 371 case PRU_SEND: 372 return (udp6_output(in6p, m, addr6, control, l)); 373 374 case PRU_ABORT: 375 soisdisconnected(so); 376 in6_pcbdetach(in6p); 377 break; 378 379 case PRU_SOCKADDR: 380 in6_setsockaddr(in6p, addr6); 381 break; 382 383 case PRU_PEERADDR: 384 in6_setpeeraddr(in6p, addr6); 385 break; 386 387 case PRU_SENSE: 388 /* 389 * stat: don't bother with a blocksize 390 */ 391 return (0); 392 393 case PRU_SENDOOB: 394 case PRU_FASTTIMO: 395 case PRU_SLOWTIMO: 396 case PRU_PROTORCV: 397 case PRU_PROTOSEND: 398 error = EOPNOTSUPP; 399 break; 400 401 case PRU_RCVD: 402 case PRU_RCVOOB: 403 return (EOPNOTSUPP); /* do not free mbuf's */ 404 405 default: 406 panic("udp6_usrreq"); 407 } 408 409 release: 410 if (control) 411 m_freem(control); 412 if (m) 413 m_freem(m); 414 return (error); 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 NULL, 0, &udp6stat, sizeof(udp6stat), 469 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, 470 CTL_EOL); 471 }
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