udp6_usrreq.c revision 1.49
1 /* $NetBSD: udp6_usrreq.c,v 1.49 2001/10/24 06:36:39 itojun 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 82 #include <net/if.h> 83 #include <net/route.h> 84 #include <net/if_types.h> 85 86 #include <netinet/in.h> 87 #include <netinet/in_var.h> 88 #include <netinet/in_systm.h> 89 #include <netinet/ip.h> 90 #include <netinet/ip_var.h> 91 #include <netinet/in_pcb.h> 92 #include <netinet/udp.h> 93 #include <netinet/udp_var.h> 94 #include <netinet/ip6.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/in6_pcb.h> 97 #include <netinet/icmp6.h> 98 #include <netinet6/udp6_var.h> 99 #include <netinet6/ip6protosw.h> 100 101 #ifdef IPSEC 102 #include <netinet6/ipsec.h> 103 #endif /* IPSEC */ 104 105 #include "faith.h" 106 #if defined(NFAITH) && NFAITH > 0 107 #include <net/if_faith.h> 108 #endif 109 110 /* 111 * UDP protocol inplementation. 112 * Per RFC 768, August, 1980. 113 */ 114 115 struct in6pcb *udp6_last_in6pcb = &udb6; 116 117 static void udp6_detach __P((struct in6pcb *)); 118 static void udp6_notify __P((struct in6pcb *, int)); 119 120 void 121 udp6_init() 122 { 123 udb6.in6p_next = udb6.in6p_prev = &udb6; 124 } 125 126 /* 127 * Notify a udp user of an asynchronous error; 128 * just wake up so that he can collect error status. 129 */ 130 static void 131 udp6_notify(in6p, errno) 132 struct in6pcb *in6p; 133 int errno; 134 { 135 in6p->in6p_socket->so_error = errno; 136 sorwakeup(in6p->in6p_socket); 137 sowwakeup(in6p->in6p_socket); 138 } 139 140 void 141 udp6_ctlinput(cmd, sa, d) 142 int cmd; 143 struct sockaddr *sa; 144 void *d; 145 { 146 struct udphdr uh; 147 struct ip6_hdr *ip6; 148 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa; 149 struct mbuf *m; 150 int off; 151 void *cmdarg; 152 struct ip6ctlparam *ip6cp = NULL; 153 const struct sockaddr_in6 *sa6_src = NULL; 154 void (*notify) __P((struct in6pcb *, int)) = udp6_notify; 155 struct udp_portonly { 156 u_int16_t uh_sport; 157 u_int16_t uh_dport; 158 } *uhp; 159 160 if (sa->sa_family != AF_INET6 || 161 sa->sa_len != sizeof(struct sockaddr_in6)) 162 return; 163 164 if ((unsigned)cmd >= PRC_NCMDS) 165 return; 166 if (PRC_IS_REDIRECT(cmd)) 167 notify = in6_rtchange, d = NULL; 168 else if (cmd == PRC_HOSTDEAD) 169 d = NULL; 170 else if (cmd == PRC_MSGSIZE) { 171 /* special code is present, see below */ 172 notify = in6_rtchange; 173 } 174 else if (inet6ctlerrmap[cmd] == 0) 175 return; 176 177 /* if the parameter is from icmp6, decode it. */ 178 if (d != NULL) { 179 ip6cp = (struct ip6ctlparam *)d; 180 m = ip6cp->ip6c_m; 181 ip6 = ip6cp->ip6c_ip6; 182 off = ip6cp->ip6c_off; 183 cmdarg = ip6cp->ip6c_cmdarg; 184 sa6_src = ip6cp->ip6c_src; 185 } else { 186 m = NULL; 187 ip6 = NULL; 188 cmdarg = NULL; 189 sa6_src = &sa6_any; 190 } 191 192 if (ip6) { 193 /* 194 * XXX: We assume that when IPV6 is non NULL, 195 * M and OFF are valid. 196 */ 197 198 /* check if we can safely examine src and dst ports */ 199 if (m->m_pkthdr.len < off + sizeof(*uhp)) { 200 if (cmd == PRC_MSGSIZE) 201 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 202 return; 203 } 204 205 bzero(&uh, sizeof(uh)); 206 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 207 208 if (cmd == PRC_MSGSIZE) { 209 int valid = 0; 210 211 /* 212 * Check to see if we have a valid UDP socket 213 * corresponding to the address in the ICMPv6 message 214 * payload. 215 */ 216 if (in6_pcblookup_connect(&udb6, &sa6->sin6_addr, 217 uh.uh_dport, (struct in6_addr *)&sa6_src->sin6_addr, 218 uh.uh_sport, 0)) 219 valid++; 220 #if 0 221 /* 222 * As the use of sendto(2) is fairly popular, 223 * we may want to allow non-connected pcb too. 224 * But it could be too weak against attacks... 225 * We should at least check if the local address (= s) 226 * is really ours. 227 */ 228 else if (in6_pcblookup_bind(&udb6, &sa6->sin6_addr, 229 uh.uh_dport, 0)) 230 valid++; 231 #endif 232 233 /* 234 * Depending on the value of "valid" and routing table 235 * size (mtudisc_{hi,lo}wat), we will: 236 * - recalculate the new MTU and create the 237 * corresponding routing entry, or 238 * - ignore the MTU change notification. 239 */ 240 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 241 242 /* 243 * regardless of if we called icmp6_mtudisc_update(), 244 * we need to call in6_pcbnotify(), to notify path 245 * MTU change to the userland (2292bis-02), because 246 * some unconnected sockets may share the same 247 * destination and want to know the path MTU. 248 */ 249 } 250 251 (void) in6_pcbnotify(&udb6, sa, uh.uh_dport, 252 (struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, 253 notify); 254 } else { 255 (void) in6_pcbnotify(&udb6, sa, 0, (struct sockaddr *)sa6_src, 256 0, cmd, cmdarg, notify); 257 } 258 } 259 260 extern int udp6_sendspace; 261 extern int udp6_recvspace; 262 263 int 264 udp6_usrreq(so, req, m, addr6, control, p) 265 struct socket *so; 266 int req; 267 struct mbuf *m, *addr6, *control; 268 struct proc *p; 269 { 270 struct in6pcb *in6p = sotoin6pcb(so); 271 int error = 0; 272 int s; 273 274 /* 275 * MAPPED_ADDR implementation info: 276 * Mapped addr support for PRU_CONTROL is not necessary. 277 * Because typical user of PRU_CONTROL is such as ifconfig, 278 * and they don't associate any addr to their socket. Then 279 * socket family is only hint about the PRU_CONTROL'ed address 280 * family, especially when getting addrs from kernel. 281 * So AF_INET socket need to be used to control AF_INET addrs, 282 * and AF_INET6 socket for AF_INET6 addrs. 283 */ 284 if (req == PRU_CONTROL) 285 return(in6_control(so, (u_long)m, (caddr_t)addr6, 286 (struct ifnet *)control, p)); 287 288 if (req == PRU_PURGEIF) { 289 in6_pcbpurgeif0(&udb6, (struct ifnet *)control); 290 in6_purgeif((struct ifnet *)control); 291 in6_pcbpurgeif(&udb6, (struct ifnet *)control); 292 return (0); 293 } 294 295 if (in6p == NULL && req != PRU_ATTACH) { 296 error = EINVAL; 297 goto release; 298 } 299 300 switch (req) { 301 case PRU_ATTACH: 302 /* 303 * MAPPED_ADDR implementation spec: 304 * Always attach for IPv6, 305 * and only when necessary for IPv4. 306 */ 307 if (in6p != NULL) { 308 error = EINVAL; 309 break; 310 } 311 s = splsoftnet(); 312 error = in6_pcballoc(so, &udb6); 313 splx(s); 314 if (error) 315 break; 316 error = soreserve(so, udp6_sendspace, udp6_recvspace); 317 if (error) 318 break; 319 in6p = sotoin6pcb(so); 320 in6p->in6p_cksum = -1; /* just to be sure */ 321 break; 322 323 case PRU_DETACH: 324 udp6_detach(in6p); 325 break; 326 327 case PRU_BIND: 328 s = splsoftnet(); 329 error = in6_pcbbind(in6p, addr6, p); 330 splx(s); 331 break; 332 333 case PRU_LISTEN: 334 error = EOPNOTSUPP; 335 break; 336 337 case PRU_CONNECT: 338 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 339 error = EISCONN; 340 break; 341 } 342 s = splsoftnet(); 343 error = in6_pcbconnect(in6p, addr6); 344 if (ip6_auto_flowlabel) { 345 in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 346 in6p->in6p_flowinfo |= 347 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 348 } 349 splx(s); 350 if (error == 0) 351 soisconnected(so); 352 break; 353 354 case PRU_CONNECT2: 355 error = EOPNOTSUPP; 356 break; 357 358 case PRU_ACCEPT: 359 error = EOPNOTSUPP; 360 break; 361 362 case PRU_DISCONNECT: 363 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 364 error = ENOTCONN; 365 break; 366 } 367 s = splsoftnet(); 368 in6_pcbdisconnect(in6p); 369 bzero((caddr_t)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr)); 370 splx(s); 371 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 372 break; 373 374 case PRU_SHUTDOWN: 375 socantsendmore(so); 376 break; 377 378 case PRU_SEND: 379 return(udp6_output(in6p, m, addr6, control, p)); 380 381 case PRU_ABORT: 382 soisdisconnected(so); 383 udp6_detach(in6p); 384 break; 385 386 case PRU_SOCKADDR: 387 in6_setsockaddr(in6p, addr6); 388 break; 389 390 case PRU_PEERADDR: 391 in6_setpeeraddr(in6p, addr6); 392 break; 393 394 case PRU_SENSE: 395 /* 396 * stat: don't bother with a blocksize 397 */ 398 return(0); 399 400 case PRU_SENDOOB: 401 case PRU_FASTTIMO: 402 case PRU_SLOWTIMO: 403 case PRU_PROTORCV: 404 case PRU_PROTOSEND: 405 error = EOPNOTSUPP; 406 break; 407 408 case PRU_RCVD: 409 case PRU_RCVOOB: 410 return(EOPNOTSUPP); /* do not free mbuf's */ 411 412 default: 413 panic("udp6_usrreq"); 414 } 415 416 release: 417 if (control) 418 m_freem(control); 419 if (m) 420 m_freem(m); 421 return(error); 422 } 423 424 static void 425 udp6_detach(in6p) 426 struct in6pcb *in6p; 427 { 428 int s = splsoftnet(); 429 430 if (in6p == udp6_last_in6pcb) 431 udp6_last_in6pcb = &udb6; 432 in6_pcbdetach(in6p); 433 splx(s); 434 } 435 436 #include <uvm/uvm_extern.h> 437 #include <sys/sysctl.h> 438 439 int 440 udp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 441 int *name; 442 u_int namelen; 443 void *oldp; 444 size_t *oldlenp; 445 void *newp; 446 size_t newlen; 447 { 448 /* All sysctl names at this level are terminal. */ 449 if (namelen != 1) 450 return ENOTDIR; 451 452 switch (name[0]) { 453 454 case UDP6CTL_SENDSPACE: 455 return sysctl_int(oldp, oldlenp, newp, newlen, 456 &udp6_sendspace); 457 case UDP6CTL_RECVSPACE: 458 return sysctl_int(oldp, oldlenp, newp, newlen, 459 &udp6_recvspace); 460 default: 461 return ENOPROTOOPT; 462 } 463 /* NOTREACHED */ 464 } 465
Indexes created Tue Sep 23 02:09:52 GMT 2025