udp6_usrreq.c revision 1.50
1 /* $NetBSD: udp6_usrreq.c,v 1.50 2001/10/29 07:02:36 simonb 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 "opt_ipsec.h" 69 70 #include <sys/param.h> 71 #include <sys/malloc.h> 72 #include <sys/mbuf.h> 73 #include <sys/protosw.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/errno.h> 77 #include <sys/stat.h> 78 #include <sys/systm.h> 79 #include <sys/proc.h> 80 #include <sys/syslog.h> 81 #include <sys/sysctl.h> 82 83 #include <net/if.h> 84 #include <net/route.h> 85 #include <net/if_types.h> 86 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet/in_systm.h> 90 #include <netinet/ip.h> 91 #include <netinet/ip_var.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet/udp.h> 94 #include <netinet/udp_var.h> 95 #include <netinet/ip6.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/in6_pcb.h> 98 #include <netinet/icmp6.h> 99 #include <netinet6/udp6_var.h> 100 #include <netinet6/ip6protosw.h> 101 102 #ifdef IPSEC 103 #include <netinet6/ipsec.h> 104 #endif /* IPSEC */ 105 106 #include "faith.h" 107 #if defined(NFAITH) && NFAITH > 0 108 #include <net/if_faith.h> 109 #endif 110 111 /* 112 * UDP protocol inplementation. 113 * Per RFC 768, August, 1980. 114 */ 115 116 struct in6pcb *udp6_last_in6pcb = &udb6; 117 118 static void udp6_detach __P((struct in6pcb *)); 119 static void udp6_notify __P((struct in6pcb *, int)); 120 121 void 122 udp6_init() 123 { 124 udb6.in6p_next = udb6.in6p_prev = &udb6; 125 } 126 127 /* 128 * Notify a udp user of an asynchronous error; 129 * just wake up so that he can collect error status. 130 */ 131 static void 132 udp6_notify(in6p, errno) 133 struct in6pcb *in6p; 134 int errno; 135 { 136 in6p->in6p_socket->so_error = errno; 137 sorwakeup(in6p->in6p_socket); 138 sowwakeup(in6p->in6p_socket); 139 } 140 141 void 142 udp6_ctlinput(cmd, sa, d) 143 int cmd; 144 struct sockaddr *sa; 145 void *d; 146 { 147 struct udphdr uh; 148 struct ip6_hdr *ip6; 149 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa; 150 struct mbuf *m; 151 int off; 152 void *cmdarg; 153 struct ip6ctlparam *ip6cp = NULL; 154 const struct sockaddr_in6 *sa6_src = NULL; 155 void (*notify) __P((struct in6pcb *, int)) = udp6_notify; 156 struct udp_portonly { 157 u_int16_t uh_sport; 158 u_int16_t uh_dport; 159 } *uhp; 160 161 if (sa->sa_family != AF_INET6 || 162 sa->sa_len != sizeof(struct sockaddr_in6)) 163 return; 164 165 if ((unsigned)cmd >= PRC_NCMDS) 166 return; 167 if (PRC_IS_REDIRECT(cmd)) 168 notify = in6_rtchange, d = NULL; 169 else if (cmd == PRC_HOSTDEAD) 170 d = NULL; 171 else if (cmd == PRC_MSGSIZE) { 172 /* special code is present, see below */ 173 notify = in6_rtchange; 174 } 175 else if (inet6ctlerrmap[cmd] == 0) 176 return; 177 178 /* if the parameter is from icmp6, decode it. */ 179 if (d != NULL) { 180 ip6cp = (struct ip6ctlparam *)d; 181 m = ip6cp->ip6c_m; 182 ip6 = ip6cp->ip6c_ip6; 183 off = ip6cp->ip6c_off; 184 cmdarg = ip6cp->ip6c_cmdarg; 185 sa6_src = ip6cp->ip6c_src; 186 } else { 187 m = NULL; 188 ip6 = NULL; 189 cmdarg = NULL; 190 sa6_src = &sa6_any; 191 } 192 193 if (ip6) { 194 /* 195 * XXX: We assume that when IPV6 is non NULL, 196 * M and OFF are valid. 197 */ 198 199 /* check if we can safely examine src and dst ports */ 200 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 201 if (cmd == PRC_MSGSIZE) 202 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 203 return; 204 } 205 206 bzero(&uh, sizeof(uh)); 207 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 208 209 if (cmd == PRC_MSGSIZE) { 210 int valid = 0; 211 212 /* 213 * Check to see if we have a valid UDP socket 214 * corresponding to the address in the ICMPv6 message 215 * payload. 216 */ 217 if (in6_pcblookup_connect(&udb6, &sa6->sin6_addr, 218 uh.uh_dport, (struct in6_addr *)&sa6_src->sin6_addr, 219 uh.uh_sport, 0)) 220 valid++; 221 #if 0 222 /* 223 * As the use of sendto(2) is fairly popular, 224 * we may want to allow non-connected pcb too. 225 * But it could be too weak against attacks... 226 * We should at least check if the local address (= s) 227 * is really ours. 228 */ 229 else if (in6_pcblookup_bind(&udb6, &sa6->sin6_addr, 230 uh.uh_dport, 0)) 231 valid++; 232 #endif 233 234 /* 235 * Depending on the value of "valid" and routing table 236 * size (mtudisc_{hi,lo}wat), we will: 237 * - recalculate the new MTU and create the 238 * corresponding routing entry, or 239 * - ignore the MTU change notification. 240 */ 241 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 242 243 /* 244 * regardless of if we called icmp6_mtudisc_update(), 245 * we need to call in6_pcbnotify(), to notify path 246 * MTU change to the userland (2292bis-02), because 247 * some unconnected sockets may share the same 248 * destination and want to know the path MTU. 249 */ 250 } 251 252 (void) in6_pcbnotify(&udb6, sa, uh.uh_dport, 253 (struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 254 notify); 255 } else { 256 (void) in6_pcbnotify(&udb6, sa, 0, (struct sockaddr *)sa6_src, 257 0, cmd, cmdarg, notify); 258 } 259 } 260 261 extern int udp6_sendspace; 262 extern int udp6_recvspace; 263 264 int 265 udp6_usrreq(so, req, m, addr6, control, p) 266 struct socket *so; 267 int req; 268 struct mbuf *m, *addr6, *control; 269 struct proc *p; 270 { 271 struct in6pcb *in6p = sotoin6pcb(so); 272 int error = 0; 273 int s; 274 275 /* 276 * MAPPED_ADDR implementation info: 277 * Mapped addr support for PRU_CONTROL is not necessary. 278 * Because typical user of PRU_CONTROL is such as ifconfig, 279 * and they don't associate any addr to their socket. Then 280 * socket family is only hint about the PRU_CONTROL'ed address 281 * family, especially when getting addrs from kernel. 282 * So AF_INET socket need to be used to control AF_INET addrs, 283 * and AF_INET6 socket for AF_INET6 addrs. 284 */ 285 if (req == PRU_CONTROL) 286 return(in6_control(so, (u_long)m, (caddr_t)addr6, 287 (struct ifnet *)control, p)); 288 289 if (req == PRU_PURGEIF) { 290 in6_pcbpurgeif0(&udb6, (struct ifnet *)control); 291 in6_purgeif((struct ifnet *)control); 292 in6_pcbpurgeif(&udb6, (struct ifnet *)control); 293 return (0); 294 } 295 296 if (in6p == NULL && req != PRU_ATTACH) { 297 error = EINVAL; 298 goto release; 299 } 300 301 switch (req) { 302 case PRU_ATTACH: 303 /* 304 * MAPPED_ADDR implementation spec: 305 * Always attach for IPv6, 306 * and only when necessary for IPv4. 307 */ 308 if (in6p != NULL) { 309 error = EINVAL; 310 break; 311 } 312 s = splsoftnet(); 313 error = in6_pcballoc(so, &udb6); 314 splx(s); 315 if (error) 316 break; 317 error = soreserve(so, udp6_sendspace, udp6_recvspace); 318 if (error) 319 break; 320 in6p = sotoin6pcb(so); 321 in6p->in6p_cksum = -1; /* just to be sure */ 322 break; 323 324 case PRU_DETACH: 325 udp6_detach(in6p); 326 break; 327 328 case PRU_BIND: 329 s = splsoftnet(); 330 error = in6_pcbbind(in6p, addr6, p); 331 splx(s); 332 break; 333 334 case PRU_LISTEN: 335 error = EOPNOTSUPP; 336 break; 337 338 case PRU_CONNECT: 339 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 340 error = EISCONN; 341 break; 342 } 343 s = splsoftnet(); 344 error = in6_pcbconnect(in6p, addr6); 345 if (ip6_auto_flowlabel) { 346 in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 347 in6p->in6p_flowinfo |= 348 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 349 } 350 splx(s); 351 if (error == 0) 352 soisconnected(so); 353 break; 354 355 case PRU_CONNECT2: 356 error = EOPNOTSUPP; 357 break; 358 359 case PRU_ACCEPT: 360 error = EOPNOTSUPP; 361 break; 362 363 case PRU_DISCONNECT: 364 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 365 error = ENOTCONN; 366 break; 367 } 368 s = splsoftnet(); 369 in6_pcbdisconnect(in6p); 370 bzero((caddr_t)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr)); 371 splx(s); 372 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 373 break; 374 375 case PRU_SHUTDOWN: 376 socantsendmore(so); 377 break; 378 379 case PRU_SEND: 380 return(udp6_output(in6p, m, addr6, control, p)); 381 382 case PRU_ABORT: 383 soisdisconnected(so); 384 udp6_detach(in6p); 385 break; 386 387 case PRU_SOCKADDR: 388 in6_setsockaddr(in6p, addr6); 389 break; 390 391 case PRU_PEERADDR: 392 in6_setpeeraddr(in6p, addr6); 393 break; 394 395 case PRU_SENSE: 396 /* 397 * stat: don't bother with a blocksize 398 */ 399 return(0); 400 401 case PRU_SENDOOB: 402 case PRU_FASTTIMO: 403 case PRU_SLOWTIMO: 404 case PRU_PROTORCV: 405 case PRU_PROTOSEND: 406 error = EOPNOTSUPP; 407 break; 408 409 case PRU_RCVD: 410 case PRU_RCVOOB: 411 return(EOPNOTSUPP); /* do not free mbuf's */ 412 413 default: 414 panic("udp6_usrreq"); 415 } 416 417 release: 418 if (control) 419 m_freem(control); 420 if (m) 421 m_freem(m); 422 return(error); 423 } 424 425 static void 426 udp6_detach(in6p) 427 struct in6pcb *in6p; 428 { 429 int s = splsoftnet(); 430 431 if (in6p == udp6_last_in6pcb) 432 udp6_last_in6pcb = &udb6; 433 in6_pcbdetach(in6p); 434 splx(s); 435 } 436 437 int 438 udp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 439 int *name; 440 u_int namelen; 441 void *oldp; 442 size_t *oldlenp; 443 void *newp; 444 size_t newlen; 445 { 446 /* All sysctl names at this level are terminal. */ 447 if (namelen != 1) 448 return ENOTDIR; 449 450 switch (name[0]) { 451 452 case UDP6CTL_SENDSPACE: 453 return sysctl_int(oldp, oldlenp, newp, newlen, 454 &udp6_sendspace); 455 case UDP6CTL_RECVSPACE: 456 return sysctl_int(oldp, oldlenp, newp, newlen, 457 &udp6_recvspace); 458 default: 459 return ENOPROTOOPT; 460 } 461 /* NOTREACHED */ 462 } 463
Indexes created Mon Sep 22 13:09:51 GMT 2025