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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 return (error); 257 } else { 258 inp->inp_lport = lport; 259 if (in_pcbinshash(inp) != 0) { 260 inp->in6p_laddr = in6addr_any; 261 inp->inp_lport = 0; 262 return (EAGAIN); 263 } 264 } 265 return (0); 266 } 267 268 /* 269 * Transform old in6_pcbconnect() into an inner subroutine for new 270 * in6_pcbconnect(): Do some validity-checking on the remote 271 * address (in mbuf 'nam') and then determine local host address 272 * (i.e., which interface) to use to access that remote host. 273 * 274 * This preserves definition of in6_pcbconnect(), while supporting a 275 * slightly different version for T/TCP. (This is more than 276 * a bit of a kludge, but cleaning up the internal interfaces would 277 * have forced minor changes in every protocol). 278 */ 279 int 280 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam, 281 struct in6_addr **plocal_addr6) 282 { 283 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 284 int error = 0; 285 struct ifnet *ifp = NULL; 286 int scope_ambiguous = 0; 287 288 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 289 INP_WLOCK_ASSERT(inp); 290 291 if (nam->sa_len != sizeof (*sin6)) 292 return (EINVAL); 293 if (sin6->sin6_family != AF_INET6) 294 return (EAFNOSUPPORT); 295 if (sin6->sin6_port == 0) 296 return (EADDRNOTAVAIL); 297 298 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 299 scope_ambiguous = 1; 300 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 301 return(error); 302 303 if (in6_ifaddr) { 304 /* 305 * If the destination address is UNSPECIFIED addr, 306 * use the loopback addr, e.g ::1. 307 */ 308 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 309 sin6->sin6_addr = in6addr_loopback; 310 } 311 if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0) 312 return (error); 313 314 /* 315 * XXX: in6_selectsrc might replace the bound local address 316 * with the address specified by setsockopt(IPV6_PKTINFO). 317 * Is it the intended behavior? 318 */ 319 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 320 inp, NULL, 321 inp->inp_cred, 322 &ifp, &error); 323 if (ifp && scope_ambiguous && 324 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 325 return(error); 326 } 327 328 if (*plocal_addr6 == NULL) { 329 if (error == 0) 330 error = EADDRNOTAVAIL; 331 return (error); 332 } 333 /* 334 * Don't do pcblookup call here; return interface in 335 * plocal_addr6 336 * and exit to caller, that will do the lookup. 337 */ 338 339 return (0); 340 } 341 342 /* 343 * Outer subroutine: 344 * Connect from a socket to a specified address. 345 * Both address and port must be specified in argument sin. 346 * If don't have a local address for this socket yet, 347 * then pick one. 348 */ 349 int 350 in6_pcbconnect(register struct inpcb *inp, struct sockaddr *nam, 351 struct ucred *cred) 352 { 353 struct in6_addr *addr6; 354 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 355 int error; 356 357 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 358 INP_WLOCK_ASSERT(inp); 359 360 /* 361 * Call inner routine, to assign local interface address. 362 * in6_pcbladdr() may automatically fill in sin6_scope_id. 363 */ 364 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 365 return (error); 366 367 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 368 sin6->sin6_port, 369 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 370 ? addr6 : &inp->in6p_laddr, 371 inp->inp_lport, 0, NULL) != NULL) { 372 return (EADDRINUSE); 373 } 374 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 375 if (inp->inp_lport == 0) { 376 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 377 if (error) 378 return (error); 379 } 380 inp->in6p_laddr = *addr6; 381 } 382 inp->in6p_faddr = sin6->sin6_addr; 383 inp->inp_fport = sin6->sin6_port; 384 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 385 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 386 if (inp->inp_flags & IN6P_AUTOFLOWLABEL) 387 inp->inp_flow |= 388 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 389 390 in_pcbrehash(inp); 391 392 return (0); 393 } 394 395 void 396 in6_pcbdisconnect(struct inpcb *inp) 397 { 398 399 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 400 INP_WLOCK_ASSERT(inp); 401 402 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 403 inp->inp_fport = 0; 404 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 405 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 406 in_pcbrehash(inp); 407 } 408 409 struct sockaddr * 410 in6_sockaddr(in_port_t port, struct in6_addr *addr_p) 411 { 412 struct sockaddr_in6 *sin6; 413 414 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 415 bzero(sin6, sizeof *sin6); 416 sin6->sin6_family = AF_INET6; 417 sin6->sin6_len = sizeof(*sin6); 418 sin6->sin6_port = port; 419 sin6->sin6_addr = *addr_p; 420 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 421 422 return (struct sockaddr *)sin6; 423 } 424 425 struct sockaddr * 426 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p) 427 { 428 struct sockaddr_in sin; 429 struct sockaddr_in6 *sin6_p; 430 431 bzero(&sin, sizeof sin); 432 sin.sin_family = AF_INET; 433 sin.sin_len = sizeof(sin); 434 sin.sin_port = port; 435 sin.sin_addr = *addr_p; 436 437 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 438 M_WAITOK); 439 in6_sin_2_v4mapsin6(&sin, sin6_p); 440 441 return (struct sockaddr *)sin6_p; 442 } 443 444 int 445 in6_getsockaddr(struct socket *so, struct sockaddr **nam) 446 { 447 register struct inpcb *inp; 448 struct in6_addr addr; 449 in_port_t port; 450 451 inp = sotoinpcb(so); 452 KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL")); 453 454 INP_RLOCK(inp); 455 port = inp->inp_lport; 456 addr = inp->in6p_laddr; 457 INP_RUNLOCK(inp); 458 459 *nam = in6_sockaddr(port, &addr); 460 return 0; 461 } 462 463 int 464 in6_getpeeraddr(struct socket *so, struct sockaddr **nam) 465 { 466 struct inpcb *inp; 467 struct in6_addr addr; 468 in_port_t port; 469 470 inp = sotoinpcb(so); 471 KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL")); 472 473 INP_RLOCK(inp); 474 port = inp->inp_fport; 475 addr = inp->in6p_faddr; 476 INP_RUNLOCK(inp); 477 478 *nam = in6_sockaddr(port, &addr); 479 return 0; 480 } 481 482 int 483 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 484 { 485 struct inpcb *inp; 486 int error; 487 488 inp = sotoinpcb(so); 489 KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL")); 490 491 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 492 error = in_getsockaddr(so, nam); 493 if (error == 0) 494 in6_sin_2_v4mapsin6_in_sock(nam); 495 } else { 496 /* scope issues will be handled in in6_getsockaddr(). */ 497 error = in6_getsockaddr(so, nam); 498 } 499 500 return error; 501 } 502 503 int 504 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 505 { 506 struct inpcb *inp; 507 int error; 508 509 inp = sotoinpcb(so); 510 KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL")); 511 512 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 513 error = in_getpeeraddr(so, nam); 514 if (error == 0) 515 in6_sin_2_v4mapsin6_in_sock(nam); 516 } else 517 /* scope issues will be handled in in6_getpeeraddr(). */ 518 error = in6_getpeeraddr(so, nam); 519 520 return error; 521 } 522 523 /* 524 * Pass some notification to all connections of a protocol 525 * associated with address dst. The local address and/or port numbers 526 * may be specified to limit the search. The "usual action" will be 527 * taken, depending on the ctlinput cmd. The caller must filter any 528 * cmds that are uninteresting (e.g., no error in the map). 529 * Call the protocol specific routine (if any) to report 530 * any errors for each matching socket. 531 */ 532 void 533 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, 534 u_int fport_arg, const struct sockaddr *src, u_int lport_arg, 535 int cmd, void *cmdarg, 536 struct inpcb *(*notify)(struct inpcb *, int)) 537 { 538 struct inpcb *inp, *inp_temp; 539 struct sockaddr_in6 sa6_src, *sa6_dst; 540 u_short fport = fport_arg, lport = lport_arg; 541 u_int32_t flowinfo; 542 int errno; 543 544 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 545 return; 546 547 sa6_dst = (struct sockaddr_in6 *)dst; 548 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 549 return; 550 551 /* 552 * note that src can be NULL when we get notify by local fragmentation. 553 */ 554 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 555 flowinfo = sa6_src.sin6_flowinfo; 556 557 /* 558 * Redirects go to all references to the destination, 559 * and use in6_rtchange to invalidate the route cache. 560 * Dead host indications: also use in6_rtchange to invalidate 561 * the cache, and deliver the error to all the sockets. 562 * Otherwise, if we have knowledge of the local port and address, 563 * deliver only to that socket. 564 */ 565 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 566 fport = 0; 567 lport = 0; 568 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 569 570 if (cmd != PRC_HOSTDEAD) 571 notify = in6_rtchange; 572 } 573 errno = inet6ctlerrmap[cmd]; 574 INP_INFO_WLOCK(pcbinfo); 575 LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) { 576 INP_WLOCK(inp); 577 if ((inp->inp_vflag & INP_IPV6) == 0) { 578 INP_WUNLOCK(inp); 579 continue; 580 } 581 582 /* 583 * If the error designates a new path MTU for a destination 584 * and the application (associated with this socket) wanted to 585 * know the value, notify. Note that we notify for all 586 * disconnected sockets if the corresponding application 587 * wanted. This is because some UDP applications keep sending 588 * sockets disconnected. 589 * XXX: should we avoid to notify the value to TCP sockets? 590 */ 591 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 592 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 593 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 594 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 595 (u_int32_t *)cmdarg); 596 } 597 598 /* 599 * Detect if we should notify the error. If no source and 600 * destination ports are specifed, but non-zero flowinfo and 601 * local address match, notify the error. This is the case 602 * when the error is delivered with an encrypted buffer 603 * by ESP. Otherwise, just compare addresses and ports 604 * as usual. 605 */ 606 if (lport == 0 && fport == 0 && flowinfo && 607 inp->inp_socket != NULL && 608 flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) && 609 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 610 goto do_notify; 611 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 612 &sa6_dst->sin6_addr) || 613 inp->inp_socket == 0 || 614 (lport && inp->inp_lport != lport) || 615 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 616 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 617 &sa6_src.sin6_addr)) || 618 (fport && inp->inp_fport != fport)) { 619 INP_WUNLOCK(inp); 620 continue; 621 } 622 623 do_notify: 624 if (notify) { 625 if ((*notify)(inp, errno)) 626 INP_WUNLOCK(inp); 627 } else 628 INP_WUNLOCK(inp); 629 } 630 INP_INFO_WUNLOCK(pcbinfo); 631 } 632 633 /* 634 * Lookup a PCB based on the local address and port. 635 */ 636 struct inpcb * 637 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, 638 u_short lport, int wild_okay, struct ucred *cred) 639 { 640 register struct inpcb *inp; 641 int matchwild = 3, wildcard; 642 643 INP_INFO_WLOCK_ASSERT(pcbinfo); 644 645 if (!wild_okay) { 646 struct inpcbhead *head; 647 /* 648 * Look for an unconnected (wildcard foreign addr) PCB that 649 * matches the local address and port we're looking for. 650 */ 651 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 652 0, pcbinfo->ipi_hashmask)]; 653 LIST_FOREACH(inp, head, inp_hash) { 654 /* XXX inp locking */ 655 if ((inp->inp_vflag & INP_IPV6) == 0) 656 continue; 657 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 658 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 659 inp->inp_lport == lport) { 660 /* Found. */ 661 if (cred == NULL || 662 inp->inp_cred->cr_prison == cred->cr_prison) 663 return (inp); 664 } 665 } 666 /* 667 * Not found. 668 */ 669 return (NULL); 670 } else { 671 struct inpcbporthead *porthash; 672 struct inpcbport *phd; 673 struct inpcb *match = NULL; 674 /* 675 * Best fit PCB lookup. 676 * 677 * First see if this local port is in use by looking on the 678 * port hash list. 679 */ 680 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 681 pcbinfo->ipi_porthashmask)]; 682 LIST_FOREACH(phd, porthash, phd_hash) { 683 if (phd->phd_port == lport) 684 break; 685 } 686 if (phd != NULL) { 687 /* 688 * Port is in use by one or more PCBs. Look for best 689 * fit. 690 */ 691 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 692 wildcard = 0; 693 if (cred != NULL && 694 inp->inp_cred->cr_prison != cred->cr_prison) 695 continue; 696 /* XXX inp locking */ 697 if ((inp->inp_vflag & INP_IPV6) == 0) 698 continue; 699 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 700 wildcard++; 701 if (!IN6_IS_ADDR_UNSPECIFIED( 702 &inp->in6p_laddr)) { 703 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 704 wildcard++; 705 else if (!IN6_ARE_ADDR_EQUAL( 706 &inp->in6p_laddr, laddr)) 707 continue; 708 } else { 709 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 710 wildcard++; 711 } 712 if (wildcard < matchwild) { 713 match = inp; 714 matchwild = wildcard; 715 if (matchwild == 0) 716 break; 717 } 718 } 719 } 720 return (match); 721 } 722 } 723 724 void 725 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 726 { 727 struct inpcb *in6p; 728 struct ip6_moptions *im6o; 729 struct in6_multi_mship *imm, *nimm; 730 731 INP_INFO_RLOCK(pcbinfo); 732 LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) { 733 INP_WLOCK(in6p); 734 im6o = in6p->in6p_moptions; 735 if ((in6p->inp_vflag & INP_IPV6) && 736 im6o) { 737 /* 738 * Unselect the outgoing interface if it is being 739 * detached. 740 */ 741 if (im6o->im6o_multicast_ifp == ifp) 742 im6o->im6o_multicast_ifp = NULL; 743 744 /* 745 * Drop multicast group membership if we joined 746 * through the interface being detached. 747 * XXX controversial - is it really legal for kernel 748 * to force this? 749 */ 750 for (imm = im6o->im6o_memberships.lh_first; 751 imm != NULL; imm = nimm) { 752 nimm = imm->i6mm_chain.le_next; 753 if (imm->i6mm_maddr->in6m_ifp == ifp) { 754 LIST_REMOVE(imm, i6mm_chain); 755 in6_delmulti(imm->i6mm_maddr); 756 free(imm, M_IP6MADDR); 757 } 758 } 759 } 760 INP_WUNLOCK(in6p); 761 } 762 INP_INFO_RUNLOCK(pcbinfo); 763 } 764 765 /* 766 * Check for alternatives when higher level complains 767 * about service problems. For now, invalidate cached 768 * routing information. If the route was created dynamically 769 * (by a redirect), time to try a default gateway again. 770 */ 771 void 772 in6_losing(struct inpcb *in6p) 773 { 774 775 /* 776 * We don't store route pointers in the routing table anymore 777 */ 778 return; 779 } 780 781 /* 782 * After a routing change, flush old routing 783 * and allocate a (hopefully) better one. 784 */ 785 struct inpcb * 786 in6_rtchange(struct inpcb *inp, int errno) 787 { 788 /* 789 * We don't store route pointers in the routing table anymore 790 */ 791 return inp; 792 } 793 794 /* 795 * Lookup PCB in hash list. 796 */ 797 struct inpcb * 798 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 799 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, int wildcard, 800 struct ifnet *ifp) 801 { 802 struct inpcbhead *head; 803 struct inpcb *inp, *tmpinp; 804 u_short fport = fport_arg, lport = lport_arg; 805 int faith; 806 807 INP_INFO_LOCK_ASSERT(pcbinfo); 808 809 if (faithprefix_p != NULL) 810 faith = (*faithprefix_p)(laddr); 811 else 812 faith = 0; 813 814 /* 815 * First look for an exact match. 816 */ 817 tmpinp = NULL; 818 head = &pcbinfo->ipi_hashbase[ 819 INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport, 820 pcbinfo->ipi_hashmask)]; 821 LIST_FOREACH(inp, head, inp_hash) { 822 /* XXX inp locking */ 823 if ((inp->inp_vflag & INP_IPV6) == 0) 824 continue; 825 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 826 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 827 inp->inp_fport == fport && 828 inp->inp_lport == lport) { 829 /* 830 * XXX We should be able to directly return 831 * the inp here, without any checks. 832 * Well unless both bound with SO_REUSEPORT? 833 */ 834 if (jailed(inp->inp_cred)) 835 return (inp); 836 if (tmpinp == NULL) 837 tmpinp = inp; 838 } 839 } 840 if (tmpinp != NULL) 841 return (tmpinp); 842 843 /* 844 * Then look for a wildcard match, if requested. 845 */ 846 if (wildcard == INPLOOKUP_WILDCARD) { 847 struct inpcb *local_wild = NULL, *local_exact = NULL; 848 struct inpcb *jail_wild = NULL; 849 int injail; 850 851 /* 852 * Order of socket selection - we always prefer jails. 853 * 1. jailed, non-wild. 854 * 2. jailed, wild. 855 * 3. non-jailed, non-wild. 856 * 4. non-jailed, wild. 857 */ 858 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 859 0, pcbinfo->ipi_hashmask)]; 860 LIST_FOREACH(inp, head, inp_hash) { 861 /* XXX inp locking */ 862 if ((inp->inp_vflag & INP_IPV6) == 0) 863 continue; 864 865 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 866 inp->inp_lport != lport) { 867 continue; 868 } 869 870 /* XXX inp locking */ 871 if (faith && (inp->inp_flags & INP_FAITH) == 0) 872 continue; 873 874 injail = jailed(inp->inp_cred); 875 if (injail) { 876 if (prison_check_ip6(inp->inp_cred, 877 laddr) != 0) 878 continue; 879 } else { 880 if (local_exact != NULL) 881 continue; 882 } 883 884 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) { 885 if (injail) 886 return (inp); 887 else 888 local_exact = inp; 889 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 890 if (injail) 891 jail_wild = inp; 892 else 893 local_wild = inp; 894 } 895 } /* LIST_FOREACH */ 896 897 if (jail_wild != NULL) 898 return (jail_wild); 899 if (local_exact != NULL) 900 return (local_exact); 901 if (local_wild != NULL) 902 return (local_wild); 903 } /* if (wildcard == INPLOOKUP_WILDCARD) */ 904 905 /* 906 * Not found. 907 */ 908 return (NULL); 909 } 910 911 void 912 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 913 { 914 struct ip6_hdr *ip; 915 916 ip = mtod(m, struct ip6_hdr *); 917 bzero(sin6, sizeof(*sin6)); 918 sin6->sin6_len = sizeof(*sin6); 919 sin6->sin6_family = AF_INET6; 920 sin6->sin6_addr = ip->ip6_src; 921 922 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 923 924 return; 925 }
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