in6_pcb.c revision 1.1.2.3
1 /* 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * Copyright (c) 1982, 1986, 1991, 1993 32 * The Regents of the University of California. All rights reserved. 33 * 34 * Redistribution and use in source and binary forms, with or without 35 * modification, are permitted provided that the following conditions 36 * are met: 37 * 1. Redistributions of source code must retain the above copyright 38 * notice, this list of conditions and the following disclaimer. 39 * 2. Redistributions in binary form must reproduce the above copyright 40 * notice, this list of conditions and the following disclaimer in the 41 * documentation and/or other materials provided with the distribution. 42 * 3. All advertising materials mentioning features or use of this software 43 * must display the following acknowledgement: 44 * This product includes software developed by the University of 45 * California, Berkeley and its contributors. 46 * 4. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 63 */ 64 65 #ifdef __NetBSD__ /*XXX*/ 66 #include "opt_ipsec.h" 67 #endif 68 69 #include <sys/param.h> 70 #include <sys/systm.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/ioctl.h> 77 #include <sys/errno.h> 78 #include <sys/time.h> 79 #include <sys/proc.h> 80 81 #include <net/if.h> 82 #include <net/route.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/in_pcb.h> 89 #include <netinet6/ip6.h> 90 #include <netinet6/in6_pcb.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet6/nd6.h> 93 94 #ifndef __bsdi__ 95 #include "loop.h" 96 #endif 97 #ifdef __NetBSD__ 98 extern struct ifnet loif[NLOOP]; 99 #endif 100 #include "faith.h" 101 102 #ifdef IPSEC 103 #include <netinet6/ipsec.h> 104 #include <netkey/key.h> 105 #include <netkey/key_debug.h> 106 #endif /* IPSEC */ 107 108 struct in6_addr zeroin6_addr; 109 110 int 111 in6_pcballoc(so, head) 112 struct socket *so; 113 struct in6pcb *head; 114 { 115 struct in6pcb *in6p; 116 117 MALLOC(in6p, struct in6pcb *, sizeof(*in6p), M_PCB, M_NOWAIT); 118 if (in6p == NULL) 119 return(ENOBUFS); 120 bzero((caddr_t)in6p, sizeof(*in6p)); 121 in6p->in6p_head = head; 122 in6p->in6p_socket = so; 123 in6p->in6p_hops = -1; /* use kernel default */ 124 in6p->in6p_icmp6filt = NULL; 125 #if 0 126 insque(in6p, head); 127 #else 128 in6p->in6p_next = head->in6p_next; 129 head->in6p_next = in6p; 130 in6p->in6p_prev = head; 131 in6p->in6p_next->in6p_prev = in6p; 132 #endif 133 so->so_pcb = (caddr_t)in6p; 134 return(0); 135 } 136 137 int 138 in6_pcbbind(in6p, nam) 139 register struct in6pcb *in6p; 140 struct mbuf *nam; 141 { 142 struct socket *so = in6p->in6p_socket; 143 struct in6pcb *head = in6p->in6p_head; 144 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 145 struct proc *p = curproc; /* XXX */ 146 u_short lport = 0; 147 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 148 int error; 149 150 if (in6p->in6p_lport || !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 151 return(EINVAL); 152 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && 153 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 154 (so->so_options & SO_ACCEPTCONN) == 0)) 155 wild = IN6PLOOKUP_WILDCARD; 156 if (nam) { 157 sin6 = mtod(nam, struct sockaddr_in6 *); 158 if (nam->m_len != sizeof(*sin6)) 159 return(EINVAL); 160 /* 161 * We should check the family, but old programs 162 * incorrectly fail to intialize it. 163 */ 164 if (sin6->sin6_family != AF_INET6) 165 return(EAFNOSUPPORT); 166 167 /* 168 * If the scope of the destination is link-local, embed the 169 * interface index in the address. 170 */ 171 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) { 172 /* XXX boundary check is assumed to be already done. */ 173 /* XXX sin6_scope_id is weaker than advanced-api. */ 174 struct in6_pktinfo *pi; 175 if (in6p->in6p_outputopts && 176 (pi = in6p->in6p_outputopts->ip6po_pktinfo) && 177 pi->ipi6_ifindex) { 178 sin6->sin6_addr.s6_addr16[1] 179 = htons(pi->ipi6_ifindex); 180 } else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) 181 && in6p->in6p_moptions 182 && in6p->in6p_moptions->im6o_multicast_ifp) { 183 sin6->sin6_addr.s6_addr16[1] = 184 htons(in6p->in6p_moptions->im6o_multicast_ifp->if_index); 185 } else if (sin6->sin6_scope_id) { 186 /* boundary check */ 187 if (sin6->sin6_scope_id < 0 188 || if_index < sin6->sin6_scope_id) { 189 return ENXIO; /* XXX EINVAL? */ 190 } 191 sin6->sin6_addr.s6_addr16[1] 192 = htons(sin6->sin6_scope_id & 0xffff);/*XXX*/ 193 /* this must be cleared for ifa_ifwithaddr() */ 194 sin6->sin6_scope_id = 0; 195 } 196 } 197 198 lport = sin6->sin6_port; 199 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 200 /* 201 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 202 * allow compepte duplication of binding if 203 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 204 * and a multicast address is bound on both 205 * new and duplicated sockets. 206 */ 207 if (so->so_options & SO_REUSEADDR) 208 reuseport = SO_REUSEADDR|SO_REUSEPORT; 209 } else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 210 struct sockaddr_in sin; 211 212 bzero(&sin, sizeof(sin)); 213 sin.sin_len = sizeof(sin); 214 sin.sin_family = AF_INET; 215 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 216 sizeof(sin.sin_addr)); 217 if (ifa_ifwithaddr((struct sockaddr *)&sin) == 0) 218 return EADDRNOTAVAIL; 219 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 220 struct ifaddr *ia = NULL; 221 222 sin6->sin6_port = 0; /* yech... */ 223 #if defined(NFAITH) && NFAITH > 0 224 if ((in6p->in6p_flags & IN6P_FAITH) == 0 225 && (ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 226 #else 227 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 228 #endif 229 return(EADDRNOTAVAIL); 230 231 /* 232 * XXX: bind to an anycast address might accidentally 233 * cause sending a packet with anycast source address. 234 */ 235 if (ia && 236 ((struct in6_ifaddr *)ia)->ia6_flags & 237 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| 238 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { 239 return(EADDRNOTAVAIL); 240 } 241 } 242 if (lport) { 243 /* GROSS */ 244 if (ntohs(lport) < IPV6PORT_RESERVED && 245 (error = suser(p->p_ucred, &p->p_acflag))) 246 return(EACCES); 247 248 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 249 /* should check this but we can't ... */ 250 #if 0 251 struct inpcb *t; 252 253 t = in_pcblookup_bind(&tcbtable, 254 (struct in_addr *)&sin6->sin6_addr.s6_addr32[3], 255 lport); 256 if (t && (reuseport & t->inp_socket->so_options) == 0) 257 return EADDRINUSE; 258 #endif 259 } else { 260 struct in6pcb *t; 261 262 t = in6_pcblookup(head, &zeroin6_addr, 0, 263 &sin6->sin6_addr, lport, wild); 264 if (t && (reuseport & t->in6p_socket->so_options) == 0) 265 return(EADDRINUSE); 266 } 267 } 268 in6p->in6p_laddr = sin6->sin6_addr; 269 } 270 271 if (lport == 0) { 272 int e; 273 if ((e = in6_pcbsetport(&in6p->in6p_laddr, in6p)) != 0) 274 return(e); 275 } 276 else 277 in6p->in6p_lport = lport; 278 279 in6p->in6p_flowinfo = sin6 ? sin6->sin6_flowinfo : 0; /*XXX*/ 280 return(0); 281 } 282 283 /* 284 * Find an empty port and set it to the specified PCB. 285 * XXX IN6P_LOWPORT 286 */ 287 int 288 in6_pcbsetport(laddr, in6p) 289 struct in6_addr *laddr; 290 struct in6pcb *in6p; 291 { 292 struct socket *so = in6p->in6p_socket; 293 struct in6pcb *head = in6p->in6p_head; 294 u_short last_port, lport = 0; 295 int wild = 0; 296 void *t; 297 298 /* XXX: this is redundant when called from in6_pcbbind */ 299 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && 300 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 301 (so->so_options & SO_ACCEPTCONN) == 0)) 302 wild = IN6PLOOKUP_WILDCARD; 303 304 /* value out of range */ 305 if (head->in6p_lport < IPV6PORT_ANONMIN) 306 head->in6p_lport = IPV6PORT_ANONMIN; 307 else if (head->in6p_lport > IPV6PORT_ANONMAX) 308 head->in6p_lport = IPV6PORT_ANONMIN; 309 last_port = head->in6p_lport; 310 goto startover; /*to randomize*/ 311 for (;;) { 312 lport = htons(head->in6p_lport); 313 if (IN6_IS_ADDR_V4MAPPED(laddr)) { 314 #if 0 315 t = in_pcblookup_bind(&tcbtable, 316 (struct in_addr *)&in6p->in6p_laddr.s6_addr32[3], 317 lport); 318 #else 319 t = NULL; 320 #endif 321 } else { 322 t = in6_pcblookup(head, &zeroin6_addr, 0, laddr, 323 lport, wild); 324 } 325 if (t == 0) 326 break; 327 startover: 328 if (head->in6p_lport >= IPV6PORT_ANONMAX) 329 head->in6p_lport = IPV6PORT_ANONMIN; 330 else 331 head->in6p_lport++; 332 if (head->in6p_lport == last_port) 333 return (EADDRINUSE); 334 } 335 336 in6p->in6p_lport = lport; 337 return(0); /* success */ 338 } 339 340 /* 341 * Connect from a socket to a specified address. 342 * Both address and port must be specified in argument sin6. 343 * If don't have a local address for this socket yet, 344 * then pick one. 345 */ 346 int 347 in6_pcbconnect(in6p, nam) 348 struct in6pcb *in6p; 349 struct mbuf *nam; 350 { 351 struct in6_addr *in6a = NULL; 352 struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *); 353 struct in6_pktinfo *pi; 354 struct ifnet *ifp = NULL; /* outgoing interface */ 355 int error = 0; 356 struct in6_addr mapped; 357 358 (void)&in6a; /* XXX fool gcc */ 359 360 if (nam->m_len != sizeof(*sin6)) 361 return(EINVAL); 362 if (sin6->sin6_family != AF_INET6) 363 return(EAFNOSUPPORT); 364 if (sin6->sin6_port == 0) 365 return(EADDRNOTAVAIL); 366 367 /* sanity check for mapped address case */ 368 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 369 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 370 in6p->in6p_laddr.s6_addr16[5] = htons(0xffff); 371 if (!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 372 return EINVAL; 373 } else { 374 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 375 return EINVAL; 376 } 377 378 /* 379 * If the scope of the destination is link-local, embed the interface 380 * index in the address. 381 */ 382 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) { 383 /* XXX boundary check is assumed to be already done. */ 384 /* XXX sin6_scope_id is weaker than advanced-api. */ 385 if (in6p->in6p_outputopts && 386 (pi = in6p->in6p_outputopts->ip6po_pktinfo) && 387 pi->ipi6_ifindex) { 388 sin6->sin6_addr.s6_addr16[1] = htons(pi->ipi6_ifindex); 389 ifp = ifindex2ifnet[pi->ipi6_ifindex]; 390 } 391 else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 392 in6p->in6p_moptions && 393 in6p->in6p_moptions->im6o_multicast_ifp) { 394 sin6->sin6_addr.s6_addr16[1] = 395 htons(in6p->in6p_moptions->im6o_multicast_ifp->if_index); 396 ifp = ifindex2ifnet[in6p->in6p_moptions->im6o_multicast_ifp->if_index]; 397 } else if (sin6->sin6_scope_id) { 398 /* boundary check */ 399 if (sin6->sin6_scope_id < 0 400 || if_index < sin6->sin6_scope_id) { 401 return ENXIO; /* XXX EINVAL? */ 402 } 403 sin6->sin6_addr.s6_addr16[1] 404 = htons(sin6->sin6_scope_id & 0xffff);/*XXX*/ 405 ifp = ifindex2ifnet[sin6->sin6_scope_id]; 406 } 407 } 408 409 /* Source address selection. */ 410 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 411 && in6p->in6p_laddr.s6_addr32[3] == 0) { 412 struct sockaddr_in sin, *sinp; 413 414 bzero(&sin, sizeof(sin)); 415 sin.sin_len = sizeof(sin); 416 sin.sin_family = AF_INET; 417 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 418 sizeof(sin.sin_addr)); 419 sinp = in_selectsrc(&sin, (struct route *)&in6p->in6p_route, 420 in6p->in6p_socket->so_options, NULL, &error); 421 if (sinp == 0) { 422 if (error == 0) 423 error = EADDRNOTAVAIL; 424 return(error); 425 } 426 bzero(&mapped, sizeof(mapped)); 427 mapped.s6_addr16[5] = htons(0xffff); 428 bcopy(&sinp->sin_addr, &mapped.s6_addr32[3], sizeof(sinp->sin_addr)); 429 in6a = &mapped; 430 } else { 431 /* 432 * XXX: in6_selectsrc might replace the bound local address 433 * with the address specified by setsockopt(IPV6_PKTINFO). 434 * Is it the intended behavior? 435 */ 436 in6a = in6_selectsrc(sin6, in6p->in6p_outputopts, 437 in6p->in6p_moptions, 438 &in6p->in6p_route, 439 &in6p->in6p_laddr, &error); 440 if (in6a == 0) { 441 if (error == 0) 442 error = EADDRNOTAVAIL; 443 return(error); 444 } 445 } 446 if (in6p->in6p_route.ro_rt) 447 ifp = in6p->in6p_route.ro_rt->rt_ifp; 448 449 in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp); 450 451 if (in6_pcblookup(in6p->in6p_head, 452 &sin6->sin6_addr, 453 sin6->sin6_port, 454 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ? 455 in6a : &in6p->in6p_laddr, 456 in6p->in6p_lport, 457 0)) 458 return(EADDRINUSE); 459 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) 460 || (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 461 && in6p->in6p_laddr.s6_addr32[3] == 0)) { 462 if (in6p->in6p_lport == 0) 463 (void)in6_pcbbind(in6p, (struct mbuf *)0); 464 in6p->in6p_laddr = *in6a; 465 } 466 in6p->in6p_faddr = sin6->sin6_addr; 467 in6p->in6p_fport = sin6->sin6_port; 468 /* 469 * xxx kazu flowlabel is necessary for connect? 470 * but if this line is missing, the garbage value remains. 471 */ 472 in6p->in6p_flowinfo = sin6->sin6_flowinfo; 473 return(0); 474 } 475 476 /* 477 * Return an IPv6 address, which is the most appropriate for given 478 * destination and user specified options. 479 * If necessary, this function lookups the routing table and return 480 * an entry to the caller for later use. 481 */ 482 struct in6_addr * 483 in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp) 484 struct sockaddr_in6 *dstsock; 485 struct ip6_pktopts *opts; 486 struct ip6_moptions *mopts; 487 struct route_in6 *ro; 488 struct in6_addr *laddr; 489 int *errorp; 490 { 491 struct in6_addr *dst; 492 struct in6_ifaddr *ia6 = 0; 493 struct in6_pktinfo *pi = NULL; 494 495 dst = &dstsock->sin6_addr; 496 *errorp = 0; 497 498 /* 499 * If the source address is explicitly specified by the caller, 500 * use it. 501 */ 502 if (opts && (pi = opts->ip6po_pktinfo) && 503 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) 504 return(&pi->ipi6_addr); 505 506 /* 507 * If the source address is not specified but the socket(if any) 508 * is already bound, use the bound address. 509 */ 510 if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) 511 return(laddr); 512 513 /* 514 * If the caller doesn't specify the source address but 515 * the outgoing interface, use an address associated with 516 * the interface. 517 */ 518 if (pi && pi->ipi6_ifindex) { 519 /* XXX boundary check is assumed to be already done. */ 520 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex], 521 dst); 522 if (ia6 == 0) { 523 *errorp = EADDRNOTAVAIL; 524 return(0); 525 } 526 return(&satosin6(&ia6->ia_addr)->sin6_addr); 527 } 528 529 /* 530 * If the destination address is a link-local unicast address or 531 * a multicast address, and if the outgoing interface is specified 532 * by the sin6_scope_id filed, use an address associated with the 533 * interface. 534 * XXX: We're now trying to define more specific semantics of 535 * sin6_scope_id field, so this part will be rewritten in 536 * the near future. 537 */ 538 if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) && 539 dstsock->sin6_scope_id) { 540 /* 541 * I'm not sure if boundary check for scope_id is done 542 * somewhere... 543 */ 544 if (dstsock->sin6_scope_id < 0 || 545 if_index < dstsock->sin6_scope_id) { 546 *errorp = ENXIO; /* XXX: better error? */ 547 return(0); 548 } 549 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id], 550 dst); 551 if (ia6 == 0) { 552 *errorp = EADDRNOTAVAIL; 553 return(0); 554 } 555 return(&satosin6(&ia6->ia_addr)->sin6_addr); 556 } 557 558 /* 559 * If the destination address is a multicast address and 560 * the outgoing interface for the address is specified 561 * by the caller, use an address associated with the interface. 562 * There is a sanity check here; if the destination has node-local 563 * scope, the outgoing interfacde should be a loopback address. 564 * Even if the outgoing interface is not specified, we also 565 * choose a loopback interface as the outgoing interface. 566 */ 567 if (IN6_IS_ADDR_MULTICAST(dst)) { 568 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL; 569 #ifdef __bsdi__ 570 extern struct ifnet loif; 571 #endif 572 573 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) { 574 #ifdef __bsdi__ 575 ifp = &loif; 576 #else 577 ifp = &loif[0]; 578 #endif 579 } 580 581 if (ifp) { 582 ia6 = in6_ifawithscope(ifp, dst); 583 if (ia6 == 0) { 584 *errorp = EADDRNOTAVAIL; 585 return(0); 586 } 587 return(&satosin6(&ia6->ia_addr)->sin6_addr); 588 } 589 } 590 591 /* 592 * If the next hop address for the packet is specified 593 * by caller, use an address associated with the route 594 * to the next hop. 595 */ 596 { 597 struct sockaddr_in6 *sin6_next; 598 struct rtentry *rt; 599 600 if (opts && opts->ip6po_nexthop) { 601 sin6_next = satosin6(opts->ip6po_nexthop); 602 rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL); 603 if (rt) { 604 ia6 = in6_ifawithscope(rt->rt_ifp, dst); 605 if (ia6 == 0) 606 ia6 = ifatoia6(rt->rt_ifa); 607 } 608 if (ia6 == 0) { 609 *errorp = EADDRNOTAVAIL; 610 return(0); 611 } 612 return(&satosin6(&ia6->ia_addr)->sin6_addr); 613 } 614 } 615 616 /* 617 * If route is known or can be allocated now, 618 * our src addr is taken from the i/f, else punt. 619 */ 620 if (ro) { 621 if (ro->ro_rt && 622 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) { 623 RTFREE(ro->ro_rt); 624 ro->ro_rt = (struct rtentry *)0; 625 } 626 if (ro->ro_rt == (struct rtentry *)0 || 627 ro->ro_rt->rt_ifp == (struct ifnet *)0) { 628 /* No route yet, so try to acquire one */ 629 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6)); 630 ro->ro_dst.sin6_family = AF_INET6; 631 ro->ro_dst.sin6_len = sizeof(struct sockaddr_in6); 632 ro->ro_dst.sin6_addr = *dst; 633 if (IN6_IS_ADDR_MULTICAST(dst)) { 634 #ifdef __FreeBSD__ 635 ro->ro_rt = rtalloc1(&((struct route *)ro) 636 ->ro_dst, 0, 0UL); 637 #endif /*__FreeBSD__*/ 638 #if defined(__bsdi__) || defined(__NetBSD__) 639 ro->ro_rt = rtalloc1(&((struct route *)ro) 640 ->ro_dst, 0); 641 #endif /*__bsdi__*/ 642 } else { 643 #ifdef __FreeBSD__ 644 rtcalloc((struct route *)ro); 645 #else 646 rtalloc((struct route *)ro); 647 #endif 648 } 649 } 650 651 /* 652 * in_pcbconnect() checks out IFF_LOOPBACK to skip using 653 * the address. But we don't know why it does so. 654 * It is necessary to ensure the scope even for lo0 655 * so doesn't check out IFF_LOOPBACK. 656 */ 657 658 if (ro->ro_rt) { 659 ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst); 660 if (ia6 == 0) /* xxx scope error ?*/ 661 ia6 = ifatoia6(ro->ro_rt->rt_ifa); 662 } 663 #if 0 664 /* 665 * xxx The followings are necessary? (kazu) 666 * I don't think so. 667 * It's for SO_DONTROUTE option in IPv4.(jinmei) 668 */ 669 if (ia6 == 0) { 670 struct sockaddr_in6 sin6 = {sizeof(sin6), AF_INET6, 0}; 671 672 sin6->sin6_addr = *dst; 673 674 ia6 = ifatoia6(ifa_ifwithdstaddr(sin6tosa(&sin6))); 675 if (ia6 == 0) 676 ia6 = ifatoia6(ifa_ifwithnet(sin6tosa(&sin6))); 677 if (ia6 == 0) 678 return(0); 679 return(&satosin6(&ia6->ia_addr)->sin6_addr); 680 } 681 #endif /* 0 */ 682 if (ia6 == 0) { 683 *errorp = EHOSTUNREACH; /* no route */ 684 return(0); 685 } 686 return(&satosin6(&ia6->ia_addr)->sin6_addr); 687 } 688 689 *errorp = EADDRNOTAVAIL; 690 return(0); 691 } 692 693 /* 694 * Default hop limit selection. The precedence is as follows: 695 * 1. Hoplimit valued specified via ioctl. 696 * 2. (If the outgoing interface is detected) the current 697 * hop limit of the interface specified by router advertisement. 698 * 3. The system default hoplimit. 699 */ 700 int 701 in6_selecthlim(in6p, ifp) 702 struct in6pcb *in6p; 703 struct ifnet *ifp; 704 { 705 if (in6p && in6p->in6p_hops >= 0) 706 return(in6p->in6p_hops); 707 else if (ifp) 708 return(nd_ifinfo[ifp->if_index].chlim); 709 else 710 return(ip6_defhlim); 711 } 712 713 void 714 in6_pcbdisconnect(in6p) 715 struct in6pcb *in6p; 716 { 717 bzero((caddr_t)&in6p->in6p_faddr, sizeof(in6p->in6p_faddr)); 718 in6p->in6p_fport = 0; 719 if (in6p->in6p_socket->so_state & SS_NOFDREF) 720 in6_pcbdetach(in6p); 721 } 722 723 void 724 in6_pcbdetach(in6p) 725 struct in6pcb *in6p; 726 { 727 struct socket *so = in6p->in6p_socket; 728 729 #ifdef IPSEC 730 ipsec6_delete_pcbpolicy(in6p); 731 #endif /* IPSEC */ 732 sotoin6pcb(so) = 0; 733 sofree(so); 734 if (in6p->in6p_options) 735 m_freem(in6p->in6p_options); 736 if (in6p->in6p_outputopts) { 737 if (in6p->in6p_outputopts->ip6po_rthdr && 738 in6p->in6p_outputopts->ip6po_route.ro_rt) 739 RTFREE(in6p->in6p_outputopts->ip6po_route.ro_rt); 740 if (in6p->in6p_outputopts->ip6po_m) 741 (void)m_free(in6p->in6p_outputopts->ip6po_m); 742 free(in6p->in6p_outputopts, M_IP6OPT); 743 } 744 if (in6p->in6p_route.ro_rt) 745 rtfree(in6p->in6p_route.ro_rt); 746 ip6_freemoptions(in6p->in6p_moptions); 747 #if 0 748 remque(in6p); 749 #else 750 in6p->in6p_next->in6p_prev = in6p->in6p_prev; 751 in6p->in6p_prev->in6p_next = in6p->in6p_next; 752 in6p->in6p_prev = NULL; 753 #endif 754 FREE(in6p, M_PCB); 755 } 756 757 void 758 in6_setsockaddr(in6p, nam) 759 struct in6pcb *in6p; 760 struct mbuf *nam; 761 { 762 struct sockaddr_in6 *sin6; 763 764 nam->m_len = sizeof(*sin6); 765 sin6 = mtod(nam, struct sockaddr_in6 *); 766 bzero((caddr_t)sin6, sizeof(*sin6)); 767 sin6->sin6_family = AF_INET6; 768 sin6->sin6_len = sizeof(struct sockaddr_in6); 769 sin6->sin6_port = in6p->in6p_lport; 770 sin6->sin6_addr = in6p->in6p_laddr; 771 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 772 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 773 else 774 sin6->sin6_scope_id = 0; /*XXX*/ 775 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 776 sin6->sin6_addr.s6_addr16[1] = 0; 777 } 778 779 void 780 in6_setpeeraddr(in6p, nam) 781 struct in6pcb *in6p; 782 struct mbuf *nam; 783 { 784 struct sockaddr_in6 *sin6; 785 786 nam->m_len = sizeof(*sin6); 787 sin6 = mtod(nam, struct sockaddr_in6 *); 788 bzero((caddr_t)sin6, sizeof(*sin6)); 789 sin6->sin6_family = AF_INET6; 790 sin6->sin6_len = sizeof(struct sockaddr_in6); 791 sin6->sin6_port = in6p->in6p_fport; 792 sin6->sin6_addr = in6p->in6p_faddr; 793 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 794 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 795 else 796 sin6->sin6_scope_id = 0; /*XXX*/ 797 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 798 sin6->sin6_addr.s6_addr16[1] = 0; 799 } 800 801 /* 802 * Pass some notification to all connections of a protocol 803 * associated with address dst. The local address and/or port numbers 804 * may be specified to limit the search. The "usual action" will be 805 * taken, depending on the ctlinput cmd. The caller must filter any 806 * cmds that are uninteresting (e.g., no error in the map). 807 * Call the protocol specific routine (if any) to report 808 * any errors for each matching socket. 809 * 810 * Must be called at splsoftnet. 811 */ 812 int 813 in6_pcbnotify(head, dst, fport_arg, laddr6, lport_arg, cmd, notify) 814 struct in6pcb *head; 815 struct sockaddr *dst; 816 u_int fport_arg, lport_arg; 817 struct in6_addr *laddr6; 818 int cmd; 819 void (*notify) __P((struct in6pcb *, int)); 820 { 821 struct in6pcb *in6p, *oin6p; 822 struct in6_addr faddr6; 823 u_short fport = fport_arg, lport = lport_arg; 824 int errno; 825 int nmatch = 0; 826 827 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 828 return 0; 829 faddr6 = ((struct sockaddr_in6 *)dst)->sin6_addr; 830 if (IN6_IS_ADDR_UNSPECIFIED(&faddr6)) 831 return 0; 832 833 /* 834 * Redirects go to all references to the destination, 835 * and use in_rtchange to invalidate the route cache. 836 * Dead host indications: notify all references to the destination. 837 * Otherwise, if we have knowledge of the local port and address, 838 * deliver only to that socket. 839 */ 840 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 841 fport = 0; 842 lport = 0; 843 bzero((caddr_t)laddr6, sizeof(*laddr6)); 844 if (cmd != PRC_HOSTDEAD) 845 notify = in6_rtchange; 846 } 847 if (notify == NULL) 848 return 0; 849 errno = inet6ctlerrmap[cmd]; 850 for (in6p = head->in6p_next; in6p != head;) { 851 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,&faddr6) || 852 in6p->in6p_socket == 0 || 853 (lport && in6p->in6p_lport != lport) || 854 (!IN6_IS_ADDR_UNSPECIFIED(laddr6) && 855 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) || 856 (fport && in6p->in6p_fport != fport)) { 857 in6p = in6p->in6p_next; 858 continue; 859 } 860 oin6p = in6p; 861 in6p = in6p->in6p_next; 862 (*notify)(oin6p, errno); 863 nmatch++; 864 } 865 return nmatch; 866 } 867 868 /* 869 * Check for alternatives when higher level complains 870 * about service problems. For now, invalidate cached 871 * routing information. If the route was created dynamically 872 * (by a redirect), time to try a default gateway again. 873 */ 874 void 875 in6_losing(in6p) 876 struct in6pcb *in6p; 877 { 878 struct rtentry *rt; 879 struct rt_addrinfo info; 880 881 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 882 in6p->in6p_route.ro_rt = 0; 883 bzero((caddr_t)&info, sizeof(info)); 884 info.rti_info[RTAX_DST] = 885 (struct sockaddr *)&in6p->in6p_route.ro_dst; 886 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 887 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 888 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 889 if (rt->rt_flags & RTF_DYNAMIC) 890 (void)rtrequest(RTM_DELETE, rt_key(rt), 891 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 892 (struct rtentry **)0); 893 else 894 /* 895 * A new route can be allocated 896 * the next time output is attempted. 897 */ 898 rtfree(rt); 899 } 900 } 901 902 /* 903 * After a routing change, flush old routing 904 * and allocate a (hopefully) better one. 905 */ 906 void 907 in6_rtchange(in6p, errno) 908 struct in6pcb *in6p; 909 int errno; 910 { 911 if (in6p->in6p_route.ro_rt) { 912 rtfree(in6p->in6p_route.ro_rt); 913 in6p->in6p_route.ro_rt = 0; 914 /* 915 * A new route can be allocated the next time 916 * output is attempted. 917 */ 918 } 919 } 920 921 struct in6pcb * 922 in6_pcblookup(head, faddr6, fport_arg, laddr6, lport_arg, flags) 923 struct in6pcb *head; 924 struct in6_addr *faddr6, *laddr6; 925 u_int fport_arg, lport_arg; 926 int flags; 927 { 928 struct in6pcb *in6p, *match = 0; 929 int matchwild = 3, wildcard; 930 u_short fport = fport_arg, lport = lport_arg; 931 932 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 933 if (in6p->in6p_lport != lport) 934 continue; 935 wildcard = 0; 936 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 937 if (IN6_IS_ADDR_UNSPECIFIED(laddr6)) 938 wildcard++; 939 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 940 continue; 941 } else { 942 if (!IN6_IS_ADDR_UNSPECIFIED(laddr6)) 943 wildcard++; 944 } 945 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 946 if (IN6_IS_ADDR_UNSPECIFIED(faddr6)) 947 wildcard++; 948 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6) 949 || in6p->in6p_fport != fport) 950 continue; 951 } else { 952 if (!IN6_IS_ADDR_UNSPECIFIED(faddr6)) 953 wildcard++; 954 } 955 if (wildcard && (flags & IN6PLOOKUP_WILDCARD) == 0) 956 continue; 957 if (wildcard < matchwild) { 958 match = in6p; 959 matchwild = wildcard; 960 if (matchwild == 0) 961 break; 962 } 963 } 964 return(match); 965 } 966 967 #ifndef TCP6 968 struct rtentry * 969 in6_pcbrtentry(in6p) 970 struct in6pcb *in6p; 971 { 972 struct route_in6 *ro; 973 974 ro = &in6p->in6p_route; 975 976 if (ro->ro_rt == NULL) { 977 /* 978 * No route yet, so try to acquire one. 979 */ 980 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 981 bzero(&ro->ro_dst, sizeof(ro->ro_dst)); 982 ro->ro_dst.sin6_family = AF_INET6; 983 ro->ro_dst.sin6_len = sizeof(struct sockaddr_in6); 984 satosin6(&ro->ro_dst)->sin6_addr = in6p->in6p_faddr; 985 rtalloc((struct route *)ro); 986 } 987 } 988 return (ro->ro_rt); 989 } 990 991 struct in6pcb * 992 in6_pcblookup_connect(head, faddr6, fport_arg, laddr6, lport_arg, faith) 993 struct in6pcb *head; 994 struct in6_addr *faddr6, *laddr6; 995 u_int fport_arg, lport_arg; 996 int faith; 997 { 998 struct in6pcb *in6p; 999 u_short fport = fport_arg, lport = lport_arg; 1000 1001 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 1002 #if defined(NFAITH) && NFAITH > 0 1003 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 1004 continue; 1005 #endif 1006 /* find exact match on both source and dest */ 1007 if (in6p->in6p_fport != fport) 1008 continue; 1009 if (in6p->in6p_lport != lport) 1010 continue; 1011 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 1012 continue; 1013 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6)) 1014 continue; 1015 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1016 continue; 1017 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 1018 continue; 1019 return in6p; 1020 } 1021 return NULL; 1022 } 1023 1024 struct in6pcb * 1025 in6_pcblookup_bind(head, laddr6, lport_arg, faith) 1026 struct in6pcb *head; 1027 struct in6_addr *laddr6; 1028 u_int lport_arg; 1029 int faith; 1030 { 1031 struct in6pcb *in6p, *match; 1032 u_short lport = lport_arg; 1033 1034 match = NULL; 1035 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 1036 /* 1037 * find destination match. exact match is preferred 1038 * against wildcard match. 1039 */ 1040 #if defined(NFAITH) && NFAITH > 0 1041 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 1042 continue; 1043 #endif 1044 if (in6p->in6p_fport != 0) 1045 continue; 1046 if (in6p->in6p_lport != lport) 1047 continue; 1048 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1049 match = in6p; 1050 else if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 1051 return in6p; 1052 } 1053 return match; 1054 } 1055 #endif 1056
Indexes created Wed Oct 22 06:10:02 GMT 2025