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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 * Copyright (c) 2010-2011 Juniper Networks, Inc. 4 * All rights reserved. 5 * 6 * Portions of this software were developed by Robert N. M. Watson under 7 * contract to Juniper Networks, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ 34 */ 35 36 /*- 37 * Copyright (c) 1982, 1986, 1991, 1993 38 * The Regents of the University of California. All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 4. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 65 */ 66 67 #include <sys/cdefs.h> 68 __FBSDID("$FreeBSD: releng/9.2/sys/netinet6/in6_pcb.c 253281 2013-07-12 18:54:47Z trociny $"); 69 70 #include "opt_inet.h" 71 #include "opt_inet6.h" 72 #include "opt_ipsec.h" 73 #include "opt_pcbgroup.h" 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/malloc.h> 78 #include <sys/mbuf.h> 79 #include <sys/domain.h> 80 #include <sys/protosw.h> 81 #include <sys/socket.h> 82 #include <sys/socketvar.h> 83 #include <sys/sockio.h> 84 #include <sys/errno.h> 85 #include <sys/time.h> 86 #include <sys/priv.h> 87 #include <sys/proc.h> 88 #include <sys/jail.h> 89 90 #include <vm/uma.h> 91 92 #include <net/if.h> 93 #include <net/if_types.h> 94 #include <net/route.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_var.h> 98 #include <netinet/in_systm.h> 99 #include <netinet/tcp_var.h> 100 #include <netinet/ip6.h> 101 #include <netinet/ip_var.h> 102 103 #include <netinet6/ip6_var.h> 104 #include <netinet6/nd6.h> 105 #include <netinet/in_pcb.h> 106 #include <netinet6/in6_pcb.h> 107 #include <netinet6/scope6_var.h> 108 109 struct in6_addr zeroin6_addr; 110 111 int 112 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam, 113 struct ucred *cred) 114 { 115 struct socket *so = inp->inp_socket; 116 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 117 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 118 u_short lport = 0; 119 int error, lookupflags = 0; 120 int reuseport = (so->so_options & SO_REUSEPORT); 121 122 INP_WLOCK_ASSERT(inp); 123 INP_HASH_WLOCK_ASSERT(pcbinfo); 124 125 if (TAILQ_EMPTY(&V_in6_ifaddrhead)) /* XXX broken! */ 126 return (EADDRNOTAVAIL); 127 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 128 return (EINVAL); 129 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 130 lookupflags = INPLOOKUP_WILDCARD; 131 if (nam == NULL) { 132 if ((error = prison_local_ip6(cred, &inp->in6p_laddr, 133 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0) 134 return (error); 135 } else { 136 sin6 = (struct sockaddr_in6 *)nam; 137 if (nam->sa_len != sizeof(*sin6)) 138 return (EINVAL); 139 /* 140 * family check. 141 */ 142 if (nam->sa_family != AF_INET6) 143 return (EAFNOSUPPORT); 144 145 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 146 return(error); 147 148 if ((error = prison_local_ip6(cred, &sin6->sin6_addr, 149 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0) 150 return (error); 151 152 lport = sin6->sin6_port; 153 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 154 /* 155 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 156 * allow compepte duplication of binding if 157 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 158 * and a multicast address is bound on both 159 * new and duplicated sockets. 160 */ 161 if (so->so_options & SO_REUSEADDR) 162 reuseport = SO_REUSEADDR|SO_REUSEPORT; 163 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 164 struct ifaddr *ifa; 165 166 sin6->sin6_port = 0; /* yech... */ 167 if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) == 168 NULL && 169 (inp->inp_flags & INP_BINDANY) == 0) { 170 return (EADDRNOTAVAIL); 171 } 172 173 /* 174 * XXX: bind to an anycast address might accidentally 175 * cause sending a packet with anycast source address. 176 * We should allow to bind to a deprecated address, since 177 * the application dares to use it. 178 */ 179 if (ifa != NULL && 180 ((struct in6_ifaddr *)ifa)->ia6_flags & 181 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 182 ifa_free(ifa); 183 return (EADDRNOTAVAIL); 184 } 185 if (ifa != NULL) 186 ifa_free(ifa); 187 } 188 if (lport) { 189 struct inpcb *t; 190 struct tcptw *tw; 191 192 /* GROSS */ 193 if (ntohs(lport) <= V_ipport_reservedhigh && 194 ntohs(lport) >= V_ipport_reservedlow && 195 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 196 0)) 197 return (EACCES); 198 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 199 priv_check_cred(inp->inp_cred, 200 PRIV_NETINET_REUSEPORT, 0) != 0) { 201 t = in6_pcblookup_local(pcbinfo, 202 &sin6->sin6_addr, lport, 203 INPLOOKUP_WILDCARD, cred); 204 if (t && 205 ((t->inp_flags & INP_TIMEWAIT) == 0) && 206 (so->so_type != SOCK_STREAM || 207 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 208 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 209 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 210 (t->inp_flags2 & INP_REUSEPORT) == 0) && 211 (inp->inp_cred->cr_uid != 212 t->inp_cred->cr_uid)) 213 return (EADDRINUSE); 214 #ifdef INET 215 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 216 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 217 struct sockaddr_in sin; 218 219 in6_sin6_2_sin(&sin, sin6); 220 t = in_pcblookup_local(pcbinfo, 221 sin.sin_addr, lport, 222 INPLOOKUP_WILDCARD, cred); 223 if (t && 224 ((t->inp_flags & 225 INP_TIMEWAIT) == 0) && 226 (so->so_type != SOCK_STREAM || 227 ntohl(t->inp_faddr.s_addr) == 228 INADDR_ANY) && 229 (inp->inp_cred->cr_uid != 230 t->inp_cred->cr_uid)) 231 return (EADDRINUSE); 232 } 233 #endif 234 } 235 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 236 lport, lookupflags, cred); 237 if (t && (t->inp_flags & INP_TIMEWAIT)) { 238 /* 239 * XXXRW: If an incpb has had its timewait 240 * state recycled, we treat the address as 241 * being in use (for now). This is better 242 * than a panic, but not desirable. 243 */ 244 tw = intotw(t); 245 if (tw == NULL || 246 (reuseport & tw->tw_so_options) == 0) 247 return (EADDRINUSE); 248 } else if (t && (reuseport & inp_so_options(t)) == 0) { 249 return (EADDRINUSE); 250 } 251 #ifdef INET 252 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 253 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 254 struct sockaddr_in sin; 255 256 in6_sin6_2_sin(&sin, sin6); 257 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 258 lport, lookupflags, cred); 259 if (t && t->inp_flags & INP_TIMEWAIT) { 260 tw = intotw(t); 261 if (tw == NULL) 262 return (EADDRINUSE); 263 if ((reuseport & tw->tw_so_options) == 0 264 && (ntohl(t->inp_laddr.s_addr) != 265 INADDR_ANY || ((inp->inp_vflag & 266 INP_IPV6PROTO) == 267 (t->inp_vflag & INP_IPV6PROTO)))) 268 return (EADDRINUSE); 269 } else if (t && 270 (reuseport & inp_so_options(t)) == 0 && 271 (ntohl(t->inp_laddr.s_addr) != INADDR_ANY || 272 (t->inp_vflag & INP_IPV6PROTO) != 0)) 273 return (EADDRINUSE); 274 } 275 #endif 276 } 277 inp->in6p_laddr = sin6->sin6_addr; 278 } 279 if (lport == 0) { 280 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) { 281 /* Undo an address bind that may have occurred. */ 282 inp->in6p_laddr = in6addr_any; 283 return (error); 284 } 285 } else { 286 inp->inp_lport = lport; 287 if (in_pcbinshash(inp) != 0) { 288 inp->in6p_laddr = in6addr_any; 289 inp->inp_lport = 0; 290 return (EAGAIN); 291 } 292 } 293 return (0); 294 } 295 296 /* 297 * Transform old in6_pcbconnect() into an inner subroutine for new 298 * in6_pcbconnect(): Do some validity-checking on the remote 299 * address (in mbuf 'nam') and then determine local host address 300 * (i.e., which interface) to use to access that remote host. 301 * 302 * This preserves definition of in6_pcbconnect(), while supporting a 303 * slightly different version for T/TCP. (This is more than 304 * a bit of a kludge, but cleaning up the internal interfaces would 305 * have forced minor changes in every protocol). 306 */ 307 int 308 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam, 309 struct in6_addr *plocal_addr6) 310 { 311 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 312 int error = 0; 313 struct ifnet *ifp = NULL; 314 int scope_ambiguous = 0; 315 struct in6_addr in6a; 316 317 INP_WLOCK_ASSERT(inp); 318 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); /* XXXRW: why? */ 319 320 if (nam->sa_len != sizeof (*sin6)) 321 return (EINVAL); 322 if (sin6->sin6_family != AF_INET6) 323 return (EAFNOSUPPORT); 324 if (sin6->sin6_port == 0) 325 return (EADDRNOTAVAIL); 326 327 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 328 scope_ambiguous = 1; 329 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 330 return(error); 331 332 if (!TAILQ_EMPTY(&V_in6_ifaddrhead)) { 333 /* 334 * If the destination address is UNSPECIFIED addr, 335 * use the loopback addr, e.g ::1. 336 */ 337 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 338 sin6->sin6_addr = in6addr_loopback; 339 } 340 if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0) 341 return (error); 342 343 error = in6_selectsrc(sin6, inp->in6p_outputopts, 344 inp, NULL, inp->inp_cred, &ifp, &in6a); 345 if (error) 346 return (error); 347 348 if (ifp && scope_ambiguous && 349 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 350 return(error); 351 } 352 353 /* 354 * Do not update this earlier, in case we return with an error. 355 * 356 * XXX: this in6_selectsrc result might replace the bound local 357 * address with the address specified by setsockopt(IPV6_PKTINFO). 358 * Is it the intended behavior? 359 */ 360 *plocal_addr6 = in6a; 361 362 /* 363 * Don't do pcblookup call here; return interface in 364 * plocal_addr6 365 * and exit to caller, that will do the lookup. 366 */ 367 368 return (0); 369 } 370 371 /* 372 * Outer subroutine: 373 * Connect from a socket to a specified address. 374 * Both address and port must be specified in argument sin. 375 * If don't have a local address for this socket yet, 376 * then pick one. 377 */ 378 int 379 in6_pcbconnect_mbuf(register struct inpcb *inp, struct sockaddr *nam, 380 struct ucred *cred, struct mbuf *m) 381 { 382 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 383 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 384 struct in6_addr addr6; 385 int error; 386 387 INP_WLOCK_ASSERT(inp); 388 INP_HASH_WLOCK_ASSERT(pcbinfo); 389 390 /* 391 * Call inner routine, to assign local interface address. 392 * in6_pcbladdr() may automatically fill in sin6_scope_id. 393 */ 394 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 395 return (error); 396 397 if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr, 398 sin6->sin6_port, 399 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 400 ? &addr6 : &inp->in6p_laddr, 401 inp->inp_lport, 0, NULL) != NULL) { 402 return (EADDRINUSE); 403 } 404 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 405 if (inp->inp_lport == 0) { 406 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 407 if (error) 408 return (error); 409 } 410 inp->in6p_laddr = addr6; 411 } 412 inp->in6p_faddr = sin6->sin6_addr; 413 inp->inp_fport = sin6->sin6_port; 414 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 415 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 416 if (inp->inp_flags & IN6P_AUTOFLOWLABEL) 417 inp->inp_flow |= 418 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 419 420 in_pcbrehash_mbuf(inp, m); 421 422 return (0); 423 } 424 425 int 426 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred) 427 { 428 429 return (in6_pcbconnect_mbuf(inp, nam, cred, NULL)); 430 } 431 432 void 433 in6_pcbdisconnect(struct inpcb *inp) 434 { 435 436 INP_WLOCK_ASSERT(inp); 437 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 438 439 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 440 inp->inp_fport = 0; 441 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 442 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 443 in_pcbrehash(inp); 444 } 445 446 struct sockaddr * 447 in6_sockaddr(in_port_t port, struct in6_addr *addr_p) 448 { 449 struct sockaddr_in6 *sin6; 450 451 sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK); 452 bzero(sin6, sizeof *sin6); 453 sin6->sin6_family = AF_INET6; 454 sin6->sin6_len = sizeof(*sin6); 455 sin6->sin6_port = port; 456 sin6->sin6_addr = *addr_p; 457 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 458 459 return (struct sockaddr *)sin6; 460 } 461 462 struct sockaddr * 463 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p) 464 { 465 struct sockaddr_in sin; 466 struct sockaddr_in6 *sin6_p; 467 468 bzero(&sin, sizeof sin); 469 sin.sin_family = AF_INET; 470 sin.sin_len = sizeof(sin); 471 sin.sin_port = port; 472 sin.sin_addr = *addr_p; 473 474 sin6_p = malloc(sizeof *sin6_p, M_SONAME, 475 M_WAITOK); 476 in6_sin_2_v4mapsin6(&sin, sin6_p); 477 478 return (struct sockaddr *)sin6_p; 479 } 480 481 int 482 in6_getsockaddr(struct socket *so, struct sockaddr **nam) 483 { 484 register struct inpcb *inp; 485 struct in6_addr addr; 486 in_port_t port; 487 488 inp = sotoinpcb(so); 489 KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL")); 490 491 INP_RLOCK(inp); 492 port = inp->inp_lport; 493 addr = inp->in6p_laddr; 494 INP_RUNLOCK(inp); 495 496 *nam = in6_sockaddr(port, &addr); 497 return 0; 498 } 499 500 int 501 in6_getpeeraddr(struct socket *so, struct sockaddr **nam) 502 { 503 struct inpcb *inp; 504 struct in6_addr addr; 505 in_port_t port; 506 507 inp = sotoinpcb(so); 508 KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL")); 509 510 INP_RLOCK(inp); 511 port = inp->inp_fport; 512 addr = inp->in6p_faddr; 513 INP_RUNLOCK(inp); 514 515 *nam = in6_sockaddr(port, &addr); 516 return 0; 517 } 518 519 int 520 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 521 { 522 struct inpcb *inp; 523 int error; 524 525 inp = sotoinpcb(so); 526 KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL")); 527 528 #ifdef INET 529 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 530 error = in_getsockaddr(so, nam); 531 if (error == 0) 532 in6_sin_2_v4mapsin6_in_sock(nam); 533 } else 534 #endif 535 { 536 /* scope issues will be handled in in6_getsockaddr(). */ 537 error = in6_getsockaddr(so, nam); 538 } 539 540 return error; 541 } 542 543 int 544 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 545 { 546 struct inpcb *inp; 547 int error; 548 549 inp = sotoinpcb(so); 550 KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL")); 551 552 #ifdef INET 553 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 554 error = in_getpeeraddr(so, nam); 555 if (error == 0) 556 in6_sin_2_v4mapsin6_in_sock(nam); 557 } else 558 #endif 559 /* scope issues will be handled in in6_getpeeraddr(). */ 560 error = in6_getpeeraddr(so, nam); 561 562 return error; 563 } 564 565 /* 566 * Pass some notification to all connections of a protocol 567 * associated with address dst. The local address and/or port numbers 568 * may be specified to limit the search. The "usual action" will be 569 * taken, depending on the ctlinput cmd. The caller must filter any 570 * cmds that are uninteresting (e.g., no error in the map). 571 * Call the protocol specific routine (if any) to report 572 * any errors for each matching socket. 573 */ 574 void 575 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, 576 u_int fport_arg, const struct sockaddr *src, u_int lport_arg, 577 int cmd, void *cmdarg, 578 struct inpcb *(*notify)(struct inpcb *, int)) 579 { 580 struct inpcb *inp, *inp_temp; 581 struct sockaddr_in6 sa6_src, *sa6_dst; 582 u_short fport = fport_arg, lport = lport_arg; 583 u_int32_t flowinfo; 584 int errno; 585 586 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 587 return; 588 589 sa6_dst = (struct sockaddr_in6 *)dst; 590 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 591 return; 592 593 /* 594 * note that src can be NULL when we get notify by local fragmentation. 595 */ 596 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 597 flowinfo = sa6_src.sin6_flowinfo; 598 599 /* 600 * Redirects go to all references to the destination, 601 * and use in6_rtchange to invalidate the route cache. 602 * Dead host indications: also use in6_rtchange to invalidate 603 * the cache, and deliver the error to all the sockets. 604 * Otherwise, if we have knowledge of the local port and address, 605 * deliver only to that socket. 606 */ 607 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 608 fport = 0; 609 lport = 0; 610 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 611 612 if (cmd != PRC_HOSTDEAD) 613 notify = in6_rtchange; 614 } 615 errno = inet6ctlerrmap[cmd]; 616 INP_INFO_WLOCK(pcbinfo); 617 LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) { 618 INP_WLOCK(inp); 619 if ((inp->inp_vflag & INP_IPV6) == 0) { 620 INP_WUNLOCK(inp); 621 continue; 622 } 623 624 /* 625 * If the error designates a new path MTU for a destination 626 * and the application (associated with this socket) wanted to 627 * know the value, notify. Note that we notify for all 628 * disconnected sockets if the corresponding application 629 * wanted. This is because some UDP applications keep sending 630 * sockets disconnected. 631 * XXX: should we avoid to notify the value to TCP sockets? 632 */ 633 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 634 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 635 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 636 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 637 (u_int32_t *)cmdarg); 638 } 639 640 /* 641 * Detect if we should notify the error. If no source and 642 * destination ports are specifed, but non-zero flowinfo and 643 * local address match, notify the error. This is the case 644 * when the error is delivered with an encrypted buffer 645 * by ESP. Otherwise, just compare addresses and ports 646 * as usual. 647 */ 648 if (lport == 0 && fport == 0 && flowinfo && 649 inp->inp_socket != NULL && 650 flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) && 651 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 652 goto do_notify; 653 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 654 &sa6_dst->sin6_addr) || 655 inp->inp_socket == 0 || 656 (lport && inp->inp_lport != lport) || 657 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 658 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 659 &sa6_src.sin6_addr)) || 660 (fport && inp->inp_fport != fport)) { 661 INP_WUNLOCK(inp); 662 continue; 663 } 664 665 do_notify: 666 if (notify) { 667 if ((*notify)(inp, errno)) 668 INP_WUNLOCK(inp); 669 } else 670 INP_WUNLOCK(inp); 671 } 672 INP_INFO_WUNLOCK(pcbinfo); 673 } 674 675 /* 676 * Lookup a PCB based on the local address and port. Caller must hold the 677 * hash lock. No inpcb locks or references are acquired. 678 */ 679 struct inpcb * 680 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, 681 u_short lport, int lookupflags, struct ucred *cred) 682 { 683 register struct inpcb *inp; 684 int matchwild = 3, wildcard; 685 686 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0, 687 ("%s: invalid lookup flags %d", __func__, lookupflags)); 688 689 INP_HASH_WLOCK_ASSERT(pcbinfo); 690 691 if ((lookupflags & INPLOOKUP_WILDCARD) == 0) { 692 struct inpcbhead *head; 693 /* 694 * Look for an unconnected (wildcard foreign addr) PCB that 695 * matches the local address and port we're looking for. 696 */ 697 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 698 0, pcbinfo->ipi_hashmask)]; 699 LIST_FOREACH(inp, head, inp_hash) { 700 /* XXX inp locking */ 701 if ((inp->inp_vflag & INP_IPV6) == 0) 702 continue; 703 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 704 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 705 inp->inp_lport == lport) { 706 /* Found. */ 707 if (cred == NULL || 708 prison_equal_ip6(cred->cr_prison, 709 inp->inp_cred->cr_prison)) 710 return (inp); 711 } 712 } 713 /* 714 * Not found. 715 */ 716 return (NULL); 717 } else { 718 struct inpcbporthead *porthash; 719 struct inpcbport *phd; 720 struct inpcb *match = NULL; 721 /* 722 * Best fit PCB lookup. 723 * 724 * First see if this local port is in use by looking on the 725 * port hash list. 726 */ 727 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 728 pcbinfo->ipi_porthashmask)]; 729 LIST_FOREACH(phd, porthash, phd_hash) { 730 if (phd->phd_port == lport) 731 break; 732 } 733 if (phd != NULL) { 734 /* 735 * Port is in use by one or more PCBs. Look for best 736 * fit. 737 */ 738 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 739 wildcard = 0; 740 if (cred != NULL && 741 !prison_equal_ip6(cred->cr_prison, 742 inp->inp_cred->cr_prison)) 743 continue; 744 /* XXX inp locking */ 745 if ((inp->inp_vflag & INP_IPV6) == 0) 746 continue; 747 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 748 wildcard++; 749 if (!IN6_IS_ADDR_UNSPECIFIED( 750 &inp->in6p_laddr)) { 751 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 752 wildcard++; 753 else if (!IN6_ARE_ADDR_EQUAL( 754 &inp->in6p_laddr, laddr)) 755 continue; 756 } else { 757 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 758 wildcard++; 759 } 760 if (wildcard < matchwild) { 761 match = inp; 762 matchwild = wildcard; 763 if (matchwild == 0) 764 break; 765 } 766 } 767 } 768 return (match); 769 } 770 } 771 772 void 773 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 774 { 775 struct inpcb *in6p; 776 struct ip6_moptions *im6o; 777 int i, gap; 778 779 INP_INFO_RLOCK(pcbinfo); 780 LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) { 781 INP_WLOCK(in6p); 782 im6o = in6p->in6p_moptions; 783 if ((in6p->inp_vflag & INP_IPV6) && im6o != NULL) { 784 /* 785 * Unselect the outgoing ifp for multicast if it 786 * is being detached. 787 */ 788 if (im6o->im6o_multicast_ifp == ifp) 789 im6o->im6o_multicast_ifp = NULL; 790 /* 791 * Drop multicast group membership if we joined 792 * through the interface being detached. 793 */ 794 gap = 0; 795 for (i = 0; i < im6o->im6o_num_memberships; i++) { 796 if (im6o->im6o_membership[i]->in6m_ifp == 797 ifp) { 798 in6_mc_leave(im6o->im6o_membership[i], 799 NULL); 800 gap++; 801 } else if (gap != 0) { 802 im6o->im6o_membership[i - gap] = 803 im6o->im6o_membership[i]; 804 } 805 } 806 im6o->im6o_num_memberships -= gap; 807 } 808 INP_WUNLOCK(in6p); 809 } 810 INP_INFO_RUNLOCK(pcbinfo); 811 } 812 813 /* 814 * Check for alternatives when higher level complains 815 * about service problems. For now, invalidate cached 816 * routing information. If the route was created dynamically 817 * (by a redirect), time to try a default gateway again. 818 */ 819 void 820 in6_losing(struct inpcb *in6p) 821 { 822 823 /* 824 * We don't store route pointers in the routing table anymore 825 */ 826 return; 827 } 828 829 /* 830 * After a routing change, flush old routing 831 * and allocate a (hopefully) better one. 832 */ 833 struct inpcb * 834 in6_rtchange(struct inpcb *inp, int errno) 835 { 836 /* 837 * We don't store route pointers in the routing table anymore 838 */ 839 return inp; 840 } 841 842 #ifdef PCBGROUP 843 /* 844 * Lookup PCB in hash list, using pcbgroup tables. 845 */ 846 static struct inpcb * 847 in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup, 848 struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr, 849 u_int lport_arg, int lookupflags, struct ifnet *ifp) 850 { 851 struct inpcbhead *head; 852 struct inpcb *inp, *tmpinp; 853 u_short fport = fport_arg, lport = lport_arg; 854 int faith; 855 856 if (faithprefix_p != NULL) 857 faith = (*faithprefix_p)(laddr); 858 else 859 faith = 0; 860 861 /* 862 * First look for an exact match. 863 */ 864 tmpinp = NULL; 865 INP_GROUP_LOCK(pcbgroup); 866 head = &pcbgroup->ipg_hashbase[ 867 INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport, 868 pcbgroup->ipg_hashmask)]; 869 LIST_FOREACH(inp, head, inp_pcbgrouphash) { 870 /* XXX inp locking */ 871 if ((inp->inp_vflag & INP_IPV6) == 0) 872 continue; 873 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 874 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 875 inp->inp_fport == fport && 876 inp->inp_lport == lport) { 877 /* 878 * XXX We should be able to directly return 879 * the inp here, without any checks. 880 * Well unless both bound with SO_REUSEPORT? 881 */ 882 if (prison_flag(inp->inp_cred, PR_IP6)) 883 goto found; 884 if (tmpinp == NULL) 885 tmpinp = inp; 886 } 887 } 888 if (tmpinp != NULL) { 889 inp = tmpinp; 890 goto found; 891 } 892 893 /* 894 * Then look for a wildcard match, if requested. 895 */ 896 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 897 struct inpcb *local_wild = NULL, *local_exact = NULL; 898 struct inpcb *jail_wild = NULL; 899 int injail; 900 901 /* 902 * Order of socket selection - we always prefer jails. 903 * 1. jailed, non-wild. 904 * 2. jailed, wild. 905 * 3. non-jailed, non-wild. 906 * 4. non-jailed, wild. 907 */ 908 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport, 909 0, pcbinfo->ipi_wildmask)]; 910 LIST_FOREACH(inp, head, inp_pcbgroup_wild) { 911 /* XXX inp locking */ 912 if ((inp->inp_vflag & INP_IPV6) == 0) 913 continue; 914 915 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 916 inp->inp_lport != lport) { 917 continue; 918 } 919 920 /* XXX inp locking */ 921 if (faith && (inp->inp_flags & INP_FAITH) == 0) 922 continue; 923 924 injail = prison_flag(inp->inp_cred, PR_IP6); 925 if (injail) { 926 if (prison_check_ip6(inp->inp_cred, 927 laddr) != 0) 928 continue; 929 } else { 930 if (local_exact != NULL) 931 continue; 932 } 933 934 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) { 935 if (injail) 936 goto found; 937 else 938 local_exact = inp; 939 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 940 if (injail) 941 jail_wild = inp; 942 else 943 local_wild = inp; 944 } 945 } /* LIST_FOREACH */ 946 947 inp = jail_wild; 948 if (inp == NULL) 949 inp = jail_wild; 950 if (inp == NULL) 951 inp = local_exact; 952 if (inp == NULL) 953 inp = local_wild; 954 if (inp != NULL) 955 goto found; 956 } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */ 957 INP_GROUP_UNLOCK(pcbgroup); 958 return (NULL); 959 960 found: 961 in_pcbref(inp); 962 INP_GROUP_UNLOCK(pcbgroup); 963 if (lookupflags & INPLOOKUP_WLOCKPCB) { 964 INP_WLOCK(inp); 965 if (in_pcbrele_wlocked(inp)) 966 return (NULL); 967 } else if (lookupflags & INPLOOKUP_RLOCKPCB) { 968 INP_RLOCK(inp); 969 if (in_pcbrele_rlocked(inp)) 970 return (NULL); 971 } else 972 panic("%s: locking buf", __func__); 973 return (inp); 974 } 975 #endif /* PCBGROUP */ 976 977 /* 978 * Lookup PCB in hash list. 979 */ 980 struct inpcb * 981 in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 982 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, 983 int lookupflags, struct ifnet *ifp) 984 { 985 struct inpcbhead *head; 986 struct inpcb *inp, *tmpinp; 987 u_short fport = fport_arg, lport = lport_arg; 988 int faith; 989 990 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0, 991 ("%s: invalid lookup flags %d", __func__, lookupflags)); 992 993 INP_HASH_LOCK_ASSERT(pcbinfo); 994 995 if (faithprefix_p != NULL) 996 faith = (*faithprefix_p)(laddr); 997 else 998 faith = 0; 999 1000 /* 1001 * First look for an exact match. 1002 */ 1003 tmpinp = NULL; 1004 head = &pcbinfo->ipi_hashbase[ 1005 INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport, 1006 pcbinfo->ipi_hashmask)]; 1007 LIST_FOREACH(inp, head, inp_hash) { 1008 /* XXX inp locking */ 1009 if ((inp->inp_vflag & INP_IPV6) == 0) 1010 continue; 1011 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 1012 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 1013 inp->inp_fport == fport && 1014 inp->inp_lport == lport) { 1015 /* 1016 * XXX We should be able to directly return 1017 * the inp here, without any checks. 1018 * Well unless both bound with SO_REUSEPORT? 1019 */ 1020 if (prison_flag(inp->inp_cred, PR_IP6)) 1021 return (inp); 1022 if (tmpinp == NULL) 1023 tmpinp = inp; 1024 } 1025 } 1026 if (tmpinp != NULL) 1027 return (tmpinp); 1028 1029 /* 1030 * Then look for a wildcard match, if requested. 1031 */ 1032 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 1033 struct inpcb *local_wild = NULL, *local_exact = NULL; 1034 struct inpcb *jail_wild = NULL; 1035 int injail; 1036 1037 /* 1038 * Order of socket selection - we always prefer jails. 1039 * 1. jailed, non-wild. 1040 * 2. jailed, wild. 1041 * 3. non-jailed, non-wild. 1042 * 4. non-jailed, wild. 1043 */ 1044 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 1045 0, pcbinfo->ipi_hashmask)]; 1046 LIST_FOREACH(inp, head, inp_hash) { 1047 /* XXX inp locking */ 1048 if ((inp->inp_vflag & INP_IPV6) == 0) 1049 continue; 1050 1051 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 1052 inp->inp_lport != lport) { 1053 continue; 1054 } 1055 1056 /* XXX inp locking */ 1057 if (faith && (inp->inp_flags & INP_FAITH) == 0) 1058 continue; 1059 1060 injail = prison_flag(inp->inp_cred, PR_IP6); 1061 if (injail) { 1062 if (prison_check_ip6(inp->inp_cred, 1063 laddr) != 0) 1064 continue; 1065 } else { 1066 if (local_exact != NULL) 1067 continue; 1068 } 1069 1070 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) { 1071 if (injail) 1072 return (inp); 1073 else 1074 local_exact = inp; 1075 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 1076 if (injail) 1077 jail_wild = inp; 1078 else 1079 local_wild = inp; 1080 } 1081 } /* LIST_FOREACH */ 1082 1083 if (jail_wild != NULL) 1084 return (jail_wild); 1085 if (local_exact != NULL) 1086 return (local_exact); 1087 if (local_wild != NULL) 1088 return (local_wild); 1089 } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */ 1090 1091 /* 1092 * Not found. 1093 */ 1094 return (NULL); 1095 } 1096 1097 /* 1098 * Lookup PCB in hash list, using pcbinfo tables. This variation locks the 1099 * hash list lock, and will return the inpcb locked (i.e., requires 1100 * INPLOOKUP_LOCKPCB). 1101 */ 1102 static struct inpcb * 1103 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 1104 u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags, 1105 struct ifnet *ifp) 1106 { 1107 struct inpcb *inp; 1108 1109 INP_HASH_RLOCK(pcbinfo); 1110 inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport, 1111 (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp); 1112 if (inp != NULL) { 1113 in_pcbref(inp); 1114 INP_HASH_RUNLOCK(pcbinfo); 1115 if (lookupflags & INPLOOKUP_WLOCKPCB) { 1116 INP_WLOCK(inp); 1117 if (in_pcbrele_wlocked(inp)) 1118 return (NULL); 1119 } else if (lookupflags & INPLOOKUP_RLOCKPCB) { 1120 INP_RLOCK(inp); 1121 if (in_pcbrele_rlocked(inp)) 1122 return (NULL); 1123 } else 1124 panic("%s: locking bug", __func__); 1125 } else 1126 INP_HASH_RUNLOCK(pcbinfo); 1127 return (inp); 1128 } 1129 1130 /* 1131 * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf 1132 * from which a pre-calculated hash value may be extracted. 1133 * 1134 * Possibly more of this logic should be in in6_pcbgroup.c. 1135 */ 1136 struct inpcb * 1137 in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport, 1138 struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp) 1139 { 1140 #if defined(PCBGROUP) 1141 struct inpcbgroup *pcbgroup; 1142 #endif 1143 1144 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0, 1145 ("%s: invalid lookup flags %d", __func__, lookupflags)); 1146 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0, 1147 ("%s: LOCKPCB not set", __func__)); 1148 1149 #if defined(PCBGROUP) 1150 if (in_pcbgroup_enabled(pcbinfo)) { 1151 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr, 1152 fport); 1153 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport, 1154 laddr, lport, lookupflags, ifp)); 1155 } 1156 #endif 1157 return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport, 1158 lookupflags, ifp)); 1159 } 1160 1161 struct inpcb * 1162 in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 1163 u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags, 1164 struct ifnet *ifp, struct mbuf *m) 1165 { 1166 #ifdef PCBGROUP 1167 struct inpcbgroup *pcbgroup; 1168 #endif 1169 1170 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0, 1171 ("%s: invalid lookup flags %d", __func__, lookupflags)); 1172 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0, 1173 ("%s: LOCKPCB not set", __func__)); 1174 1175 #ifdef PCBGROUP 1176 if (in_pcbgroup_enabled(pcbinfo)) { 1177 pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m), 1178 m->m_pkthdr.flowid); 1179 if (pcbgroup != NULL) 1180 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, 1181 fport, laddr, lport, lookupflags, ifp)); 1182 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr, 1183 fport); 1184 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport, 1185 laddr, lport, lookupflags, ifp)); 1186 } 1187 #endif 1188 return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport, 1189 lookupflags, ifp)); 1190 } 1191 1192 void 1193 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 1194 { 1195 struct ip6_hdr *ip; 1196 1197 ip = mtod(m, struct ip6_hdr *); 1198 bzero(sin6, sizeof(*sin6)); 1199 sin6->sin6_len = sizeof(*sin6); 1200 sin6->sin6_family = AF_INET6; 1201 sin6->sin6_addr = ip->ip6_src; 1202 1203 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 1204 1205 return; 1206 }
Cache object: 83aed0c90977f3b2d61b219cbc515999
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