udp6_usrreq.c revision 1.65
1 /* $NetBSD: udp6_usrreq.c,v 1.65 2005/03/09 05:07:19 atatat 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 1.65 2005/03/09 05:07:19 atatat 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 99 #include "faith.h" 100 #if defined(NFAITH) && NFAITH > 0 101 #include <net/if_faith.h> 102 #endif 103 104 /* 105 * UDP protocol inplementation. 106 * Per RFC 768, August, 1980. 107 */ 108 109 extern struct inpcbtable udbtable; 110 struct udp6stat udp6stat; 111 112 static void udp6_notify __P((struct in6pcb *, int)); 113 114 void 115 udp6_init() 116 { 117 /* initialization done in udp_input() due to initialization order */ 118 } 119 120 /* 121 * Notify a udp user of an asynchronous error; 122 * just wake up so that he can collect error status. 123 */ 124 static void 125 udp6_notify(in6p, errno) 126 struct in6pcb *in6p; 127 int errno; 128 { 129 in6p->in6p_socket->so_error = errno; 130 sorwakeup(in6p->in6p_socket); 131 sowwakeup(in6p->in6p_socket); 132 } 133 134 void 135 udp6_ctlinput(cmd, sa, d) 136 int cmd; 137 struct sockaddr *sa; 138 void *d; 139 { 140 struct udphdr uh; 141 struct ip6_hdr *ip6; 142 struct sockaddr_in6 *sa6 = (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) __P((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; 157 158 if ((unsigned)cmd >= PRC_NCMDS) 159 return; 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; 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; 198 } 199 200 bzero(&uh, sizeof(uh)); 201 m_copydata(m, off, sizeof(*uhp), (caddr_t)&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, (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 icmp6_mtudisc_update(), 239 * we need to call in6_pcbnotify(), to notify path 240 * MTU change to the userland (2292bis-02), because 241 * some unconnected sockets may share the same 242 * destination and want to know the path MTU. 243 */ 244 } 245 246 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, 247 (struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 248 notify); 249 } else { 250 (void) in6_pcbnotify(&udbtable, sa, 0, 251 (struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 252 } 253 } 254 255 extern int udp6_sendspace; 256 extern int udp6_recvspace; 257 258 int 259 udp6_usrreq(so, req, m, addr6, control, p) 260 struct socket *so; 261 int req; 262 struct mbuf *m, *addr6, *control; 263 struct proc *p; 264 { 265 struct in6pcb *in6p = sotoin6pcb(so); 266 int error = 0; 267 int s; 268 269 /* 270 * MAPPED_ADDR implementation info: 271 * Mapped addr support for PRU_CONTROL is not necessary. 272 * Because typical user of PRU_CONTROL is such as ifconfig, 273 * and they don't associate any addr to their socket. Then 274 * socket family is only hint about the PRU_CONTROL'ed address 275 * family, especially when getting addrs from kernel. 276 * So AF_INET socket need to be used to control AF_INET addrs, 277 * and AF_INET6 socket for AF_INET6 addrs. 278 */ 279 if (req == PRU_CONTROL) 280 return (in6_control(so, (u_long)m, (caddr_t)addr6, 281 (struct ifnet *)control, p)); 282 283 if (req == PRU_PURGEIF) { 284 in6_pcbpurgeif0(&udbtable, (struct ifnet *)control); 285 in6_purgeif((struct ifnet *)control); 286 in6_pcbpurgeif(&udbtable, (struct ifnet *)control); 287 return (0); 288 } 289 290 if (in6p == NULL && req != PRU_ATTACH) { 291 error = EINVAL; 292 goto release; 293 } 294 295 switch (req) { 296 case PRU_ATTACH: 297 /* 298 * MAPPED_ADDR implementation spec: 299 * Always attach for IPv6, 300 * and only when necessary for IPv4. 301 */ 302 if (in6p != NULL) { 303 error = EINVAL; 304 break; 305 } 306 s = splsoftnet(); 307 error = in6_pcballoc(so, &udbtable); 308 splx(s); 309 if (error) 310 break; 311 error = soreserve(so, udp6_sendspace, udp6_recvspace); 312 if (error) 313 break; 314 in6p = sotoin6pcb(so); 315 in6p->in6p_cksum = -1; /* just to be sure */ 316 break; 317 318 case PRU_DETACH: 319 in6_pcbdetach(in6p); 320 break; 321 322 case PRU_BIND: 323 s = splsoftnet(); 324 error = in6_pcbbind(in6p, addr6, p); 325 splx(s); 326 break; 327 328 case PRU_LISTEN: 329 error = EOPNOTSUPP; 330 break; 331 332 case PRU_CONNECT: 333 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 334 error = EISCONN; 335 break; 336 } 337 s = splsoftnet(); 338 error = in6_pcbconnect(in6p, addr6); 339 splx(s); 340 if (error == 0) 341 soisconnected(so); 342 break; 343 344 case PRU_CONNECT2: 345 error = EOPNOTSUPP; 346 break; 347 348 case PRU_ACCEPT: 349 error = EOPNOTSUPP; 350 break; 351 352 case PRU_DISCONNECT: 353 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 354 error = ENOTCONN; 355 break; 356 } 357 s = splsoftnet(); 358 in6_pcbdisconnect(in6p); 359 bzero((caddr_t)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr)); 360 splx(s); 361 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 362 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ 363 break; 364 365 case PRU_SHUTDOWN: 366 socantsendmore(so); 367 break; 368 369 case PRU_SEND: 370 return (udp6_output(in6p, m, addr6, control, p)); 371 372 case PRU_ABORT: 373 soisdisconnected(so); 374 in6_pcbdetach(in6p); 375 break; 376 377 case PRU_SOCKADDR: 378 in6_setsockaddr(in6p, addr6); 379 break; 380 381 case PRU_PEERADDR: 382 in6_setpeeraddr(in6p, addr6); 383 break; 384 385 case PRU_SENSE: 386 /* 387 * stat: don't bother with a blocksize 388 */ 389 return (0); 390 391 case PRU_SENDOOB: 392 case PRU_FASTTIMO: 393 case PRU_SLOWTIMO: 394 case PRU_PROTORCV: 395 case PRU_PROTOSEND: 396 error = EOPNOTSUPP; 397 break; 398 399 case PRU_RCVD: 400 case PRU_RCVOOB: 401 return (EOPNOTSUPP); /* do not free mbuf's */ 402 403 default: 404 panic("udp6_usrreq"); 405 } 406 407 release: 408 if (control) 409 m_freem(control); 410 if (m) 411 m_freem(m); 412 return (error); 413 } 414 415 SYSCTL_SETUP(sysctl_net_inet6_udp6_setup, "sysctl net.inet6.udp6 subtree setup") 416 { 417 sysctl_createv(clog, 0, NULL, NULL, 418 CTLFLAG_PERMANENT, 419 CTLTYPE_NODE, "net", NULL, 420 NULL, 0, NULL, 0, 421 CTL_NET, CTL_EOL); 422 sysctl_createv(clog, 0, NULL, NULL, 423 CTLFLAG_PERMANENT, 424 CTLTYPE_NODE, "inet6", NULL, 425 NULL, 0, NULL, 0, 426 CTL_NET, PF_INET6, CTL_EOL); 427 sysctl_createv(clog, 0, NULL, NULL, 428 CTLFLAG_PERMANENT, 429 CTLTYPE_NODE, "udp6", 430 SYSCTL_DESCR("UDPv6 related settings"), 431 NULL, 0, NULL, 0, 432 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); 433 434 sysctl_createv(clog, 0, NULL, NULL, 435 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 436 CTLTYPE_INT, "sendspace", 437 SYSCTL_DESCR("Default UDP send buffer size"), 438 NULL, 0, &udp6_sendspace, 0, 439 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE, 440 CTL_EOL); 441 sysctl_createv(clog, 0, NULL, NULL, 442 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 443 CTLTYPE_INT, "recvspace", 444 SYSCTL_DESCR("Default UDP receive buffer size"), 445 NULL, 0, &udp6_recvspace, 0, 446 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE, 447 CTL_EOL); 448 sysctl_createv(clog, 0, NULL, NULL, 449 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 450 CTLTYPE_INT, "do_loopback_cksum", 451 SYSCTL_DESCR("Perform UDP checksum on loopback"), 452 NULL, 0, &udp_do_loopback_cksum, 0, 453 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM, 454 CTL_EOL); 455 sysctl_createv(clog, 0, NULL, NULL, 456 CTLFLAG_PERMANENT, 457 CTLTYPE_STRUCT, "pcblist", 458 SYSCTL_DESCR("UDP protocol control block list"), 459 sysctl_inpcblist, 0, &udbtable, 0, 460 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE, 461 CTL_EOL); 462 } 463
Indexes created Mon Sep 22 13:09:51 GMT 2025