udp6_usrreq.c revision 1.54
1 /* $NetBSD: udp6_usrreq.c,v 1.54 2003/06/28 14:22:12 darrenr 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. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 66 */ 67 68 #include <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.54 2003/06/28 14:22:12 darrenr Exp $"); 70 71 #include "opt_ipsec.h" 72 73 #include <sys/param.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/errno.h> 80 #include <sys/stat.h> 81 #include <sys/systm.h> 82 #include <sys/proc.h> 83 #include <sys/syslog.h> 84 #include <sys/sysctl.h> 85 86 #include <net/if.h> 87 #include <net/route.h> 88 #include <net/if_types.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet/in_systm.h> 93 #include <netinet/ip.h> 94 #include <netinet/ip_var.h> 95 #include <netinet/in_pcb.h> 96 #include <netinet/udp.h> 97 #include <netinet/udp_var.h> 98 #include <netinet/ip6.h> 99 #include <netinet6/ip6_var.h> 100 #include <netinet6/in6_pcb.h> 101 #include <netinet/icmp6.h> 102 #include <netinet6/udp6_var.h> 103 #include <netinet6/ip6protosw.h> 104 105 #ifdef IPSEC 106 #include <netinet6/ipsec.h> 107 #endif /* IPSEC */ 108 109 #include "faith.h" 110 #if defined(NFAITH) && NFAITH > 0 111 #include <net/if_faith.h> 112 #endif 113 114 /* 115 * UDP protocol inplementation. 116 * Per RFC 768, August, 1980. 117 */ 118 119 struct in6pcb udb6; 120 struct in6pcb *udp6_last_in6pcb = &udb6; 121 struct udp6stat udp6stat; 122 123 static void udp6_detach __P((struct in6pcb *)); 124 static void udp6_notify __P((struct in6pcb *, int)); 125 126 void 127 udp6_init() 128 { 129 udb6.in6p_next = udb6.in6p_prev = &udb6; 130 } 131 132 /* 133 * Notify a udp user of an asynchronous error; 134 * just wake up so that he can collect error status. 135 */ 136 static void 137 udp6_notify(in6p, errno) 138 struct in6pcb *in6p; 139 int errno; 140 { 141 in6p->in6p_socket->so_error = errno; 142 sorwakeup(in6p->in6p_socket); 143 sowwakeup(in6p->in6p_socket); 144 } 145 146 void 147 udp6_ctlinput(cmd, sa, d) 148 int cmd; 149 struct sockaddr *sa; 150 void *d; 151 { 152 struct udphdr uh; 153 struct ip6_hdr *ip6; 154 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa; 155 struct mbuf *m; 156 int off; 157 void *cmdarg; 158 struct ip6ctlparam *ip6cp = NULL; 159 const struct sockaddr_in6 *sa6_src = NULL; 160 void (*notify) __P((struct in6pcb *, int)) = udp6_notify; 161 struct udp_portonly { 162 u_int16_t uh_sport; 163 u_int16_t uh_dport; 164 } *uhp; 165 166 if (sa->sa_family != AF_INET6 || 167 sa->sa_len != sizeof(struct sockaddr_in6)) 168 return; 169 170 if ((unsigned)cmd >= PRC_NCMDS) 171 return; 172 if (PRC_IS_REDIRECT(cmd)) 173 notify = in6_rtchange, d = NULL; 174 else if (cmd == PRC_HOSTDEAD) 175 d = NULL; 176 else if (cmd == PRC_MSGSIZE) { 177 /* special code is present, see below */ 178 notify = in6_rtchange; 179 } 180 else if (inet6ctlerrmap[cmd] == 0) 181 return; 182 183 /* if the parameter is from icmp6, decode it. */ 184 if (d != NULL) { 185 ip6cp = (struct ip6ctlparam *)d; 186 m = ip6cp->ip6c_m; 187 ip6 = ip6cp->ip6c_ip6; 188 off = ip6cp->ip6c_off; 189 cmdarg = ip6cp->ip6c_cmdarg; 190 sa6_src = ip6cp->ip6c_src; 191 } else { 192 m = NULL; 193 ip6 = NULL; 194 cmdarg = NULL; 195 sa6_src = &sa6_any; 196 } 197 198 if (ip6) { 199 /* 200 * XXX: We assume that when IPV6 is non NULL, 201 * M and OFF are valid. 202 */ 203 204 /* check if we can safely examine src and dst ports */ 205 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 206 if (cmd == PRC_MSGSIZE) 207 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 208 return; 209 } 210 211 bzero(&uh, sizeof(uh)); 212 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 213 214 if (cmd == PRC_MSGSIZE) { 215 int valid = 0; 216 217 /* 218 * Check to see if we have a valid UDP socket 219 * corresponding to the address in the ICMPv6 message 220 * payload. 221 */ 222 if (in6_pcblookup_connect(&udb6, &sa6->sin6_addr, 223 uh.uh_dport, (struct in6_addr *)&sa6_src->sin6_addr, 224 uh.uh_sport, 0)) 225 valid++; 226 #if 0 227 /* 228 * As the use of sendto(2) is fairly popular, 229 * we may want to allow non-connected pcb too. 230 * But it could be too weak against attacks... 231 * We should at least check if the local address (= s) 232 * is really ours. 233 */ 234 else if (in6_pcblookup_bind(&udb6, &sa6->sin6_addr, 235 uh.uh_dport, 0)) 236 valid++; 237 #endif 238 239 /* 240 * Depending on the value of "valid" and routing table 241 * size (mtudisc_{hi,lo}wat), we will: 242 * - recalculate the new MTU and create the 243 * corresponding routing entry, or 244 * - ignore the MTU change notification. 245 */ 246 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 247 248 /* 249 * regardless of if we called icmp6_mtudisc_update(), 250 * we need to call in6_pcbnotify(), to notify path 251 * MTU change to the userland (2292bis-02), because 252 * some unconnected sockets may share the same 253 * destination and want to know the path MTU. 254 */ 255 } 256 257 (void) in6_pcbnotify(&udb6, sa, uh.uh_dport, 258 (struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 259 notify); 260 } else { 261 (void) in6_pcbnotify(&udb6, sa, 0, (struct sockaddr *)sa6_src, 262 0, cmd, cmdarg, notify); 263 } 264 } 265 266 extern int udp6_sendspace; 267 extern int udp6_recvspace; 268 269 int 270 udp6_usrreq(so, req, m, addr6, control, l) 271 struct socket *so; 272 int req; 273 struct mbuf *m, *addr6, *control; 274 struct lwp *l; 275 { 276 struct in6pcb *in6p = sotoin6pcb(so); 277 struct proc *p; 278 int error = 0; 279 int s; 280 281 p = l ? l->l_proc : NULL; 282 /* 283 * MAPPED_ADDR implementation info: 284 * Mapped addr support for PRU_CONTROL is not necessary. 285 * Because typical user of PRU_CONTROL is such as ifconfig, 286 * and they don't associate any addr to their socket. Then 287 * socket family is only hint about the PRU_CONTROL'ed address 288 * family, especially when getting addrs from kernel. 289 * So AF_INET socket need to be used to control AF_INET addrs, 290 * and AF_INET6 socket for AF_INET6 addrs. 291 */ 292 if (req == PRU_CONTROL) 293 return (in6_control(so, (u_long)m, (caddr_t)addr6, 294 (struct ifnet *)control, p)); 295 296 if (req == PRU_PURGEIF) { 297 in6_pcbpurgeif0(&udb6, (struct ifnet *)control); 298 in6_purgeif((struct ifnet *)control); 299 in6_pcbpurgeif(&udb6, (struct ifnet *)control); 300 return (0); 301 } 302 303 if (in6p == NULL && req != PRU_ATTACH) { 304 error = EINVAL; 305 goto release; 306 } 307 308 switch (req) { 309 case PRU_ATTACH: 310 /* 311 * MAPPED_ADDR implementation spec: 312 * Always attach for IPv6, 313 * and only when necessary for IPv4. 314 */ 315 if (in6p != NULL) { 316 error = EINVAL; 317 break; 318 } 319 s = splsoftnet(); 320 error = in6_pcballoc(so, &udb6); 321 splx(s); 322 if (error) 323 break; 324 error = soreserve(so, udp6_sendspace, udp6_recvspace); 325 if (error) 326 break; 327 in6p = sotoin6pcb(so); 328 in6p->in6p_cksum = -1; /* just to be sure */ 329 break; 330 331 case PRU_DETACH: 332 udp6_detach(in6p); 333 break; 334 335 case PRU_BIND: 336 s = splsoftnet(); 337 error = in6_pcbbind(in6p, addr6, p); 338 splx(s); 339 break; 340 341 case PRU_LISTEN: 342 error = EOPNOTSUPP; 343 break; 344 345 case PRU_CONNECT: 346 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 347 error = EISCONN; 348 break; 349 } 350 s = splsoftnet(); 351 error = in6_pcbconnect(in6p, addr6); 352 if (ip6_auto_flowlabel) { 353 in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 354 in6p->in6p_flowinfo |= 355 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 356 } 357 splx(s); 358 if (error == 0) 359 soisconnected(so); 360 break; 361 362 case PRU_CONNECT2: 363 error = EOPNOTSUPP; 364 break; 365 366 case PRU_ACCEPT: 367 error = EOPNOTSUPP; 368 break; 369 370 case PRU_DISCONNECT: 371 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 372 error = ENOTCONN; 373 break; 374 } 375 s = splsoftnet(); 376 in6_pcbdisconnect(in6p); 377 bzero((caddr_t)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr)); 378 splx(s); 379 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 380 break; 381 382 case PRU_SHUTDOWN: 383 socantsendmore(so); 384 break; 385 386 case PRU_SEND: 387 return (udp6_output(in6p, m, addr6, control, p)); 388 389 case PRU_ABORT: 390 soisdisconnected(so); 391 udp6_detach(in6p); 392 break; 393 394 case PRU_SOCKADDR: 395 in6_setsockaddr(in6p, addr6); 396 break; 397 398 case PRU_PEERADDR: 399 in6_setpeeraddr(in6p, addr6); 400 break; 401 402 case PRU_SENSE: 403 /* 404 * stat: don't bother with a blocksize 405 */ 406 return (0); 407 408 case PRU_SENDOOB: 409 case PRU_FASTTIMO: 410 case PRU_SLOWTIMO: 411 case PRU_PROTORCV: 412 case PRU_PROTOSEND: 413 error = EOPNOTSUPP; 414 break; 415 416 case PRU_RCVD: 417 case PRU_RCVOOB: 418 return (EOPNOTSUPP); /* do not free mbuf's */ 419 420 default: 421 panic("udp6_usrreq"); 422 } 423 424 release: 425 if (control) 426 m_freem(control); 427 if (m) 428 m_freem(m); 429 return (error); 430 } 431 432 static void 433 udp6_detach(in6p) 434 struct in6pcb *in6p; 435 { 436 int s = splsoftnet(); 437 438 if (in6p == udp6_last_in6pcb) 439 udp6_last_in6pcb = &udb6; 440 in6_pcbdetach(in6p); 441 splx(s); 442 } 443 444 int 445 udp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 446 int *name; 447 u_int namelen; 448 void *oldp; 449 size_t *oldlenp; 450 void *newp; 451 size_t newlen; 452 { 453 /* All sysctl names at this level are terminal. */ 454 if (namelen != 1) 455 return ENOTDIR; 456 457 switch (name[0]) { 458 459 case UDP6CTL_SENDSPACE: 460 return sysctl_int(oldp, oldlenp, newp, newlen, 461 &udp6_sendspace); 462 case UDP6CTL_RECVSPACE: 463 return sysctl_int(oldp, oldlenp, newp, newlen, 464 &udp6_recvspace); 465 default: 466 return ENOPROTOOPT; 467 } 468 /* NOTREACHED */ 469 } 470
Indexes created Mon Sep 29 21:09:56 GMT 2025