Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet6/in6_pcb.c
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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 * $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1991, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD$"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipsec.h" 69 #include "opt_mac.h" 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/domain.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/sockio.h> 80 #include <sys/errno.h> 81 #include <sys/time.h> 82 #include <sys/priv.h> 83 #include <sys/proc.h> 84 #include <sys/jail.h> 85 86 #include <vm/uma.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/route.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <netinet/in_systm.h> 95 #include <netinet/tcp_var.h> 96 #include <netinet/ip6.h> 97 #include <netinet/ip_var.h> 98 #include <netinet6/ip6_var.h> 99 #include <netinet6/nd6.h> 100 #include <netinet/in_pcb.h> 101 #include <netinet6/in6_pcb.h> 102 #include <netinet6/scope6_var.h> 103 104 #include <security/mac/mac_framework.h> 105 106 struct in6_addr zeroin6_addr; 107 108 int 109 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam, 110 struct ucred *cred) 111 { 112 struct socket *so = inp->inp_socket; 113 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 114 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 115 u_short lport = 0; 116 int error, wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 117 118 INP_INFO_WLOCK_ASSERT(pcbinfo); 119 INP_WLOCK_ASSERT(inp); 120 121 if (!in6_ifaddr) /* XXX broken! */ 122 return (EADDRNOTAVAIL); 123 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 124 return (EINVAL); 125 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 126 wild = INPLOOKUP_WILDCARD; 127 if (nam == NULL) { 128 if ((error = prison_local_ip6(cred, &inp->in6p_laddr, 129 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0) 130 return (error); 131 } else { 132 sin6 = (struct sockaddr_in6 *)nam; 133 if (nam->sa_len != sizeof(*sin6)) 134 return (EINVAL); 135 /* 136 * family check. 137 */ 138 if (nam->sa_family != AF_INET6) 139 return (EAFNOSUPPORT); 140 141 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 142 return(error); 143 144 if ((error = prison_local_ip6(cred, &sin6->sin6_addr, 145 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0) 146 return (error); 147 148 lport = sin6->sin6_port; 149 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 150 /* 151 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 152 * allow compepte duplication of binding if 153 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 154 * and a multicast address is bound on both 155 * new and duplicated sockets. 156 */ 157 if (so->so_options & SO_REUSEADDR) 158 reuseport = SO_REUSEADDR|SO_REUSEPORT; 159 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 160 struct ifaddr *ia = NULL; 161 162 sin6->sin6_port = 0; /* yech... */ 163 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 164 return (EADDRNOTAVAIL); 165 166 /* 167 * XXX: bind to an anycast address might accidentally 168 * cause sending a packet with anycast source address. 169 * We should allow to bind to a deprecated address, since 170 * the application dares to use it. 171 */ 172 if (ia && 173 ((struct in6_ifaddr *)ia)->ia6_flags & 174 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 175 return (EADDRNOTAVAIL); 176 } 177 } 178 if (lport) { 179 struct inpcb *t; 180 181 /* GROSS */ 182 if (ntohs(lport) <= ipport_reservedhigh && 183 ntohs(lport) >= ipport_reservedlow && 184 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 185 0)) 186 return (EACCES); 187 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 188 priv_check_cred(inp->inp_cred, 189 PRIV_NETINET_REUSEPORT, 0) != 0) { 190 t = in6_pcblookup_local(pcbinfo, 191 &sin6->sin6_addr, lport, 192 INPLOOKUP_WILDCARD, cred); 193 if (t && 194 ((t->inp_flags & INP_TIMEWAIT) == 0) && 195 (so->so_type != SOCK_STREAM || 196 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 197 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 198 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 199 (t->inp_socket->so_options & SO_REUSEPORT) 200 == 0) && (inp->inp_cred->cr_uid != 201 t->inp_cred->cr_uid)) 202 return (EADDRINUSE); 203 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 204 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 205 struct sockaddr_in sin; 206 207 in6_sin6_2_sin(&sin, sin6); 208 t = in_pcblookup_local(pcbinfo, 209 sin.sin_addr, lport, 210 INPLOOKUP_WILDCARD, cred); 211 if (t && 212 ((t->inp_flags & 213 INP_TIMEWAIT) == 0) && 214 (so->so_type != SOCK_STREAM || 215 ntohl(t->inp_faddr.s_addr) == 216 INADDR_ANY) && 217 (inp->inp_cred->cr_uid != 218 t->inp_cred->cr_uid)) 219 return (EADDRINUSE); 220 } 221 } 222 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 223 lport, wild, cred); 224 if (t && (reuseport & ((t->inp_flags & INP_TIMEWAIT) ? 225 intotw(t)->tw_so_options : 226 t->inp_socket->so_options)) == 0) 227 return (EADDRINUSE); 228 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 229 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 230 struct sockaddr_in sin; 231 232 in6_sin6_2_sin(&sin, sin6); 233 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 234 lport, wild, cred); 235 if (t && t->inp_flags & INP_TIMEWAIT) { 236 if ((reuseport & 237 intotw(t)->tw_so_options) == 0 && 238 (ntohl(t->inp_laddr.s_addr) != 239 INADDR_ANY || ((inp->inp_vflag & 240 INP_IPV6PROTO) == 241 (t->inp_vflag & INP_IPV6PROTO)))) 242 return (EADDRINUSE); 243 } 244 else if (t && 245 (reuseport & t->inp_socket->so_options) 246 == 0 && (ntohl(t->inp_laddr.s_addr) != 247 INADDR_ANY || INP_SOCKAF(so) == 248 INP_SOCKAF(t->inp_socket))) 249 return (EADDRINUSE); 250 } 251 } 252 inp->in6p_laddr = sin6->sin6_addr; 253 } 254 if (lport == 0) { 255 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) { 256 /* Undo an address bind that may have occurred. */ 257 inp->in6p_laddr = in6addr_any; 258 return (error); 259 } 260 } else { 261 inp->inp_lport = lport; 262 if (in_pcbinshash(inp) != 0) { 263 inp->in6p_laddr = in6addr_any; 264 inp->inp_lport = 0; 265 return (EAGAIN); 266 } 267 } 268 return (0); 269 } 270 271 /* 272 * Transform old in6_pcbconnect() into an inner subroutine for new 273 * in6_pcbconnect(): Do some validity-checking on the remote 274 * address (in mbuf 'nam') and then determine local host address 275 * (i.e., which interface) to use to access that remote host. 276 * 277 * This preserves definition of in6_pcbconnect(), while supporting a 278 * slightly different version for T/TCP. (This is more than 279 * a bit of a kludge, but cleaning up the internal interfaces would 280 * have forced minor changes in every protocol). 281 */ 282 int 283 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam, 284 struct in6_addr *plocal_addr6) 285 { 286 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 287 int error = 0; 288 struct ifnet *ifp = NULL; 289 int scope_ambiguous = 0; 290 struct in6_addr in6a; 291 292 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 293 INP_WLOCK_ASSERT(inp); 294 295 if (nam->sa_len != sizeof (*sin6)) 296 return (EINVAL); 297 if (sin6->sin6_family != AF_INET6) 298 return (EAFNOSUPPORT); 299 if (sin6->sin6_port == 0) 300 return (EADDRNOTAVAIL); 301 302 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 303 scope_ambiguous = 1; 304 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 305 return(error); 306 307 if (in6_ifaddr) { 308 /* 309 * If the destination address is UNSPECIFIED addr, 310 * use the loopback addr, e.g ::1. 311 */ 312 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 313 sin6->sin6_addr = in6addr_loopback; 314 } 315 if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0) 316 return (error); 317 318 error = in6_selectsrc(sin6, inp->in6p_outputopts, 319 inp, NULL, inp->inp_cred, &ifp, &in6a); 320 if (error) 321 return (error); 322 323 if (ifp && scope_ambiguous && 324 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 325 return(error); 326 } 327 328 /* 329 * Do not update this earlier, in case we return with an error. 330 * 331 * XXX: this in6_selectsrc result might replace the bound local 332 * address with the address specified by setsockopt(IPV6_PKTINFO). 333 * Is it the intended behavior? 334 */ 335 *plocal_addr6 = in6a; 336 337 /* 338 * Don't do pcblookup call here; return interface in 339 * plocal_addr6 340 * and exit to caller, that will do the lookup. 341 */ 342 343 return (0); 344 } 345 346 /* 347 * Outer subroutine: 348 * Connect from a socket to a specified address. 349 * Both address and port must be specified in argument sin. 350 * If don't have a local address for this socket yet, 351 * then pick one. 352 */ 353 int 354 in6_pcbconnect(register struct inpcb *inp, struct sockaddr *nam, 355 struct ucred *cred) 356 { 357 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 358 struct in6_addr addr6; 359 int error; 360 361 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 362 INP_WLOCK_ASSERT(inp); 363 364 /* 365 * Call inner routine, to assign local interface address. 366 * in6_pcbladdr() may automatically fill in sin6_scope_id. 367 */ 368 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 369 return (error); 370 371 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 372 sin6->sin6_port, 373 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 374 ? &addr6 : &inp->in6p_laddr, 375 inp->inp_lport, 0, NULL) != NULL) { 376 return (EADDRINUSE); 377 } 378 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 379 if (inp->inp_lport == 0) { 380 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 381 if (error) 382 return (error); 383 } 384 inp->in6p_laddr = addr6; 385 } 386 inp->in6p_faddr = sin6->sin6_addr; 387 inp->inp_fport = sin6->sin6_port; 388 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 389 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 390 if (inp->inp_flags & IN6P_AUTOFLOWLABEL) 391 inp->inp_flow |= 392 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 393 394 in_pcbrehash(inp); 395 396 return (0); 397 } 398 399 void 400 in6_pcbdisconnect(struct inpcb *inp) 401 { 402 403 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 404 INP_WLOCK_ASSERT(inp); 405 406 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 407 inp->inp_fport = 0; 408 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 409 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 410 in_pcbrehash(inp); 411 } 412 413 struct sockaddr * 414 in6_sockaddr(in_port_t port, struct in6_addr *addr_p) 415 { 416 struct sockaddr_in6 *sin6; 417 418 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 419 bzero(sin6, sizeof *sin6); 420 sin6->sin6_family = AF_INET6; 421 sin6->sin6_len = sizeof(*sin6); 422 sin6->sin6_port = port; 423 sin6->sin6_addr = *addr_p; 424 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 425 426 return (struct sockaddr *)sin6; 427 } 428 429 struct sockaddr * 430 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p) 431 { 432 struct sockaddr_in sin; 433 struct sockaddr_in6 *sin6_p; 434 435 bzero(&sin, sizeof sin); 436 sin.sin_family = AF_INET; 437 sin.sin_len = sizeof(sin); 438 sin.sin_port = port; 439 sin.sin_addr = *addr_p; 440 441 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 442 M_WAITOK); 443 in6_sin_2_v4mapsin6(&sin, sin6_p); 444 445 return (struct sockaddr *)sin6_p; 446 } 447 448 int 449 in6_getsockaddr(struct socket *so, struct sockaddr **nam) 450 { 451 register struct inpcb *inp; 452 struct in6_addr addr; 453 in_port_t port; 454 455 inp = sotoinpcb(so); 456 KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL")); 457 458 INP_RLOCK(inp); 459 port = inp->inp_lport; 460 addr = inp->in6p_laddr; 461 INP_RUNLOCK(inp); 462 463 *nam = in6_sockaddr(port, &addr); 464 return 0; 465 } 466 467 int 468 in6_getpeeraddr(struct socket *so, struct sockaddr **nam) 469 { 470 struct inpcb *inp; 471 struct in6_addr addr; 472 in_port_t port; 473 474 inp = sotoinpcb(so); 475 KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL")); 476 477 INP_RLOCK(inp); 478 port = inp->inp_fport; 479 addr = inp->in6p_faddr; 480 INP_RUNLOCK(inp); 481 482 *nam = in6_sockaddr(port, &addr); 483 return 0; 484 } 485 486 int 487 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 488 { 489 struct inpcb *inp; 490 int error; 491 492 inp = sotoinpcb(so); 493 KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL")); 494 495 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 496 error = in_getsockaddr(so, nam); 497 if (error == 0) 498 in6_sin_2_v4mapsin6_in_sock(nam); 499 } else { 500 /* scope issues will be handled in in6_getsockaddr(). */ 501 error = in6_getsockaddr(so, nam); 502 } 503 504 return error; 505 } 506 507 int 508 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 509 { 510 struct inpcb *inp; 511 int error; 512 513 inp = sotoinpcb(so); 514 KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL")); 515 516 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 517 error = in_getpeeraddr(so, nam); 518 if (error == 0) 519 in6_sin_2_v4mapsin6_in_sock(nam); 520 } else 521 /* scope issues will be handled in in6_getpeeraddr(). */ 522 error = in6_getpeeraddr(so, nam); 523 524 return error; 525 } 526 527 /* 528 * Pass some notification to all connections of a protocol 529 * associated with address dst. The local address and/or port numbers 530 * may be specified to limit the search. The "usual action" will be 531 * taken, depending on the ctlinput cmd. The caller must filter any 532 * cmds that are uninteresting (e.g., no error in the map). 533 * Call the protocol specific routine (if any) to report 534 * any errors for each matching socket. 535 */ 536 void 537 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, 538 u_int fport_arg, const struct sockaddr *src, u_int lport_arg, 539 int cmd, void *cmdarg, 540 struct inpcb *(*notify)(struct inpcb *, int)) 541 { 542 struct inpcb *inp, *inp_temp; 543 struct sockaddr_in6 sa6_src, *sa6_dst; 544 u_short fport = fport_arg, lport = lport_arg; 545 u_int32_t flowinfo; 546 int errno; 547 548 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 549 return; 550 551 sa6_dst = (struct sockaddr_in6 *)dst; 552 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 553 return; 554 555 /* 556 * note that src can be NULL when we get notify by local fragmentation. 557 */ 558 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 559 flowinfo = sa6_src.sin6_flowinfo; 560 561 /* 562 * Redirects go to all references to the destination, 563 * and use in6_rtchange to invalidate the route cache. 564 * Dead host indications: also use in6_rtchange to invalidate 565 * the cache, and deliver the error to all the sockets. 566 * Otherwise, if we have knowledge of the local port and address, 567 * deliver only to that socket. 568 */ 569 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 570 fport = 0; 571 lport = 0; 572 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 573 574 if (cmd != PRC_HOSTDEAD) 575 notify = in6_rtchange; 576 } 577 errno = inet6ctlerrmap[cmd]; 578 INP_INFO_WLOCK(pcbinfo); 579 LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) { 580 INP_WLOCK(inp); 581 if ((inp->inp_vflag & INP_IPV6) == 0) { 582 INP_WUNLOCK(inp); 583 continue; 584 } 585 586 /* 587 * If the error designates a new path MTU for a destination 588 * and the application (associated with this socket) wanted to 589 * know the value, notify. Note that we notify for all 590 * disconnected sockets if the corresponding application 591 * wanted. This is because some UDP applications keep sending 592 * sockets disconnected. 593 * XXX: should we avoid to notify the value to TCP sockets? 594 */ 595 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 596 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 597 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 598 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 599 (u_int32_t *)cmdarg); 600 } 601 602 /* 603 * Detect if we should notify the error. If no source and 604 * destination ports are specifed, but non-zero flowinfo and 605 * local address match, notify the error. This is the case 606 * when the error is delivered with an encrypted buffer 607 * by ESP. Otherwise, just compare addresses and ports 608 * as usual. 609 */ 610 if (lport == 0 && fport == 0 && flowinfo && 611 inp->inp_socket != NULL && 612 flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) && 613 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 614 goto do_notify; 615 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 616 &sa6_dst->sin6_addr) || 617 inp->inp_socket == 0 || 618 (lport && inp->inp_lport != lport) || 619 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 620 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 621 &sa6_src.sin6_addr)) || 622 (fport && inp->inp_fport != fport)) { 623 INP_WUNLOCK(inp); 624 continue; 625 } 626 627 do_notify: 628 if (notify) { 629 if ((*notify)(inp, errno)) 630 INP_WUNLOCK(inp); 631 } else 632 INP_WUNLOCK(inp); 633 } 634 INP_INFO_WUNLOCK(pcbinfo); 635 } 636 637 /* 638 * Lookup a PCB based on the local address and port. 639 */ 640 struct inpcb * 641 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, 642 u_short lport, int wild_okay, struct ucred *cred) 643 { 644 register struct inpcb *inp; 645 int matchwild = 3, wildcard; 646 647 INP_INFO_WLOCK_ASSERT(pcbinfo); 648 649 if (!wild_okay) { 650 struct inpcbhead *head; 651 /* 652 * Look for an unconnected (wildcard foreign addr) PCB that 653 * matches the local address and port we're looking for. 654 */ 655 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 656 0, pcbinfo->ipi_hashmask)]; 657 LIST_FOREACH(inp, head, inp_hash) { 658 /* XXX inp locking */ 659 if ((inp->inp_vflag & INP_IPV6) == 0) 660 continue; 661 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 662 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 663 inp->inp_lport == lport) { 664 /* Found. */ 665 if (cred == NULL || 666 inp->inp_cred->cr_prison == cred->cr_prison) 667 return (inp); 668 } 669 } 670 /* 671 * Not found. 672 */ 673 return (NULL); 674 } else { 675 struct inpcbporthead *porthash; 676 struct inpcbport *phd; 677 struct inpcb *match = NULL; 678 /* 679 * Best fit PCB lookup. 680 * 681 * First see if this local port is in use by looking on the 682 * port hash list. 683 */ 684 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 685 pcbinfo->ipi_porthashmask)]; 686 LIST_FOREACH(phd, porthash, phd_hash) { 687 if (phd->phd_port == lport) 688 break; 689 } 690 if (phd != NULL) { 691 /* 692 * Port is in use by one or more PCBs. Look for best 693 * fit. 694 */ 695 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 696 wildcard = 0; 697 if (cred != NULL && 698 inp->inp_cred->cr_prison != cred->cr_prison) 699 continue; 700 /* XXX inp locking */ 701 if ((inp->inp_vflag & INP_IPV6) == 0) 702 continue; 703 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 704 wildcard++; 705 if (!IN6_IS_ADDR_UNSPECIFIED( 706 &inp->in6p_laddr)) { 707 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 708 wildcard++; 709 else if (!IN6_ARE_ADDR_EQUAL( 710 &inp->in6p_laddr, laddr)) 711 continue; 712 } else { 713 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 714 wildcard++; 715 } 716 if (wildcard < matchwild) { 717 match = inp; 718 matchwild = wildcard; 719 if (matchwild == 0) 720 break; 721 } 722 } 723 } 724 return (match); 725 } 726 } 727 728 void 729 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 730 { 731 struct inpcb *in6p; 732 struct ip6_moptions *im6o; 733 struct in6_multi_mship *imm, *nimm; 734 735 INP_INFO_RLOCK(pcbinfo); 736 LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) { 737 INP_WLOCK(in6p); 738 im6o = in6p->in6p_moptions; 739 if ((in6p->inp_vflag & INP_IPV6) && 740 im6o) { 741 /* 742 * Unselect the outgoing interface if it is being 743 * detached. 744 */ 745 if (im6o->im6o_multicast_ifp == ifp) 746 im6o->im6o_multicast_ifp = NULL; 747 748 /* 749 * Drop multicast group membership if we joined 750 * through the interface being detached. 751 * XXX controversial - is it really legal for kernel 752 * to force this? 753 */ 754 for (imm = im6o->im6o_memberships.lh_first; 755 imm != NULL; imm = nimm) { 756 nimm = imm->i6mm_chain.le_next; 757 if (imm->i6mm_maddr->in6m_ifp == ifp) { 758 LIST_REMOVE(imm, i6mm_chain); 759 in6_delmulti(imm->i6mm_maddr); 760 free(imm, M_IP6MADDR); 761 } 762 } 763 } 764 INP_WUNLOCK(in6p); 765 } 766 INP_INFO_RUNLOCK(pcbinfo); 767 } 768 769 /* 770 * Check for alternatives when higher level complains 771 * about service problems. For now, invalidate cached 772 * routing information. If the route was created dynamically 773 * (by a redirect), time to try a default gateway again. 774 */ 775 void 776 in6_losing(struct inpcb *in6p) 777 { 778 779 /* 780 * We don't store route pointers in the routing table anymore 781 */ 782 return; 783 } 784 785 /* 786 * After a routing change, flush old routing 787 * and allocate a (hopefully) better one. 788 */ 789 struct inpcb * 790 in6_rtchange(struct inpcb *inp, int errno) 791 { 792 /* 793 * We don't store route pointers in the routing table anymore 794 */ 795 return inp; 796 } 797 798 /* 799 * Lookup PCB in hash list. 800 */ 801 struct inpcb * 802 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 803 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, int wildcard, 804 struct ifnet *ifp) 805 { 806 struct inpcbhead *head; 807 struct inpcb *inp, *tmpinp; 808 u_short fport = fport_arg, lport = lport_arg; 809 int faith; 810 811 INP_INFO_LOCK_ASSERT(pcbinfo); 812 813 if (faithprefix_p != NULL) 814 faith = (*faithprefix_p)(laddr); 815 else 816 faith = 0; 817 818 /* 819 * First look for an exact match. 820 */ 821 tmpinp = NULL; 822 head = &pcbinfo->ipi_hashbase[ 823 INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport, 824 pcbinfo->ipi_hashmask)]; 825 LIST_FOREACH(inp, head, inp_hash) { 826 /* XXX inp locking */ 827 if ((inp->inp_vflag & INP_IPV6) == 0) 828 continue; 829 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 830 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 831 inp->inp_fport == fport && 832 inp->inp_lport == lport) { 833 /* 834 * XXX We should be able to directly return 835 * the inp here, without any checks. 836 * Well unless both bound with SO_REUSEPORT? 837 */ 838 if (jailed(inp->inp_cred)) 839 return (inp); 840 if (tmpinp == NULL) 841 tmpinp = inp; 842 } 843 } 844 if (tmpinp != NULL) 845 return (tmpinp); 846 847 /* 848 * Then look for a wildcard match, if requested. 849 */ 850 if (wildcard == INPLOOKUP_WILDCARD) { 851 struct inpcb *local_wild = NULL, *local_exact = NULL; 852 struct inpcb *jail_wild = NULL; 853 int injail; 854 855 /* 856 * Order of socket selection - we always prefer jails. 857 * 1. jailed, non-wild. 858 * 2. jailed, wild. 859 * 3. non-jailed, non-wild. 860 * 4. non-jailed, wild. 861 */ 862 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 863 0, pcbinfo->ipi_hashmask)]; 864 LIST_FOREACH(inp, head, inp_hash) { 865 /* XXX inp locking */ 866 if ((inp->inp_vflag & INP_IPV6) == 0) 867 continue; 868 869 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 870 inp->inp_lport != lport) { 871 continue; 872 } 873 874 /* XXX inp locking */ 875 if (faith && (inp->inp_flags & INP_FAITH) == 0) 876 continue; 877 878 injail = jailed(inp->inp_cred); 879 if (injail) { 880 if (prison_check_ip6(inp->inp_cred, 881 laddr) != 0) 882 continue; 883 } else { 884 if (local_exact != NULL) 885 continue; 886 } 887 888 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) { 889 if (injail) 890 return (inp); 891 else 892 local_exact = inp; 893 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 894 if (injail) 895 jail_wild = inp; 896 else 897 local_wild = inp; 898 } 899 } /* LIST_FOREACH */ 900 901 if (jail_wild != NULL) 902 return (jail_wild); 903 if (local_exact != NULL) 904 return (local_exact); 905 if (local_wild != NULL) 906 return (local_wild); 907 } /* if (wildcard == INPLOOKUP_WILDCARD) */ 908 909 /* 910 * Not found. 911 */ 912 return (NULL); 913 } 914 915 void 916 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 917 { 918 struct ip6_hdr *ip; 919 920 ip = mtod(m, struct ip6_hdr *); 921 bzero(sin6, sizeof(*sin6)); 922 sin6->sin6_len = sizeof(*sin6); 923 sin6->sin6_family = AF_INET6; 924 sin6->sin6_addr = ip->ip6_src; 925 926 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 927 928 return; 929 }
Cache object: 53186dfa76e894ae4da46faaf0346886
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