1 /* $FreeBSD$ */ 2 /* $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 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 #include "opt_inet.h" 66 #include "opt_inet6.h" 67 #include "opt_ipsec.h" 68 #include "opt_random_ip_id.h" 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/domain.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/sockio.h> 79 #include <sys/errno.h> 80 #include <sys/time.h> 81 #include <sys/proc.h> 82 #include <sys/jail.h> 83 84 #include <vm/uma.h> 85 86 #include <net/if.h> 87 #include <net/if_types.h> 88 #include <net/route.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet/in_systm.h> 93 #include <netinet/tcp_var.h> 94 #include <netinet/ip6.h> 95 #include <netinet/ip_var.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/nd6.h> 98 #include <netinet/in_pcb.h> 99 #include <netinet6/in6_pcb.h> 100 101 #ifdef IPSEC 102 #include <netinet6/ipsec.h> 103 #ifdef INET6 104 #include <netinet6/ipsec6.h> 105 #endif 106 #include <netinet6/ah.h> 107 #ifdef INET6 108 #include <netinet6/ah6.h> 109 #endif 110 #include <netkey/key.h> 111 #endif /* IPSEC */ 112 113 #ifdef FAST_IPSEC 114 #include <netipsec/ipsec.h> 115 #include <netipsec/ipsec6.h> 116 #include <netipsec/key.h> 117 #endif /* FAST_IPSEC */ 118 119 struct in6_addr zeroin6_addr; 120 121 int 122 in6_pcbbind(inp, nam, cred) 123 register struct inpcb *inp; 124 struct sockaddr *nam; 125 struct ucred *cred; 126 { 127 struct socket *so = inp->inp_socket; 128 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 129 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 130 u_short lport = 0; 131 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 132 133 if (!in6_ifaddr) /* XXX broken! */ 134 return (EADDRNOTAVAIL); 135 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 136 return (EINVAL); 137 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 138 wild = 1; 139 if (nam) { 140 sin6 = (struct sockaddr_in6 *)nam; 141 if (nam->sa_len != sizeof(*sin6)) 142 return (EINVAL); 143 /* 144 * family check. 145 */ 146 if (nam->sa_family != AF_INET6) 147 return (EAFNOSUPPORT); 148 149 /* KAME hack: embed scopeid */ 150 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 151 return EINVAL; 152 /* this must be cleared for ifa_ifwithaddr() */ 153 sin6->sin6_scope_id = 0; 154 155 lport = sin6->sin6_port; 156 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 157 /* 158 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 159 * allow compepte duplication of binding if 160 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 161 * and a multicast address is bound on both 162 * new and duplicated sockets. 163 */ 164 if (so->so_options & SO_REUSEADDR) 165 reuseport = SO_REUSEADDR|SO_REUSEPORT; 166 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 167 struct ifaddr *ia = NULL; 168 169 sin6->sin6_port = 0; /* yech... */ 170 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 171 return (EADDRNOTAVAIL); 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 (ia && 180 ((struct in6_ifaddr *)ia)->ia6_flags & 181 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 182 return (EADDRNOTAVAIL); 183 } 184 } 185 if (lport) { 186 struct inpcb *t; 187 188 /* GROSS */ 189 if (ntohs(lport) < IPV6PORT_RESERVED && 190 suser_cred(cred, PRISON_ROOT)) 191 return (EACCES); 192 if (so->so_cred->cr_uid != 0 && 193 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 194 t = in6_pcblookup_local(pcbinfo, 195 &sin6->sin6_addr, lport, 196 INPLOOKUP_WILDCARD); 197 if (t && (t->inp_vflag & INP_TIMEWAIT)) { 198 if ((!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 199 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 200 !(intotw(t)->tw_so_options & SO_REUSEPORT)) 201 && so->so_cred->cr_uid != 202 intotw(t)->tw_cred->cr_uid) 203 return (EADDRINUSE); 204 } else if (t && 205 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 206 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 207 (t->inp_socket->so_options & SO_REUSEPORT) 208 == 0) && (so->so_cred->cr_uid != 209 t->inp_socket->so_cred->cr_uid)) 210 return (EADDRINUSE); 211 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 212 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 213 struct sockaddr_in sin; 214 215 in6_sin6_2_sin(&sin, sin6); 216 t = in_pcblookup_local(pcbinfo, 217 sin.sin_addr, lport, 218 INPLOOKUP_WILDCARD); 219 if (t && (t->inp_vflag & INP_TIMEWAIT)) { 220 if (so->so_cred->cr_uid != 221 intotw(t)->tw_cred->cr_uid && 222 (ntohl(t->inp_laddr.s_addr) != 223 INADDR_ANY || 224 ((inp->inp_vflag & 225 INP_IPV6PROTO) == 226 (t->inp_vflag & 227 INP_IPV6PROTO)))) 228 return (EADDRINUSE); 229 } else if (t && 230 (so->so_cred->cr_uid != 231 t->inp_socket->so_cred->cr_uid) && 232 (ntohl(t->inp_laddr.s_addr) != 233 INADDR_ANY || 234 INP_SOCKAF(so) == 235 INP_SOCKAF(t->inp_socket))) 236 return (EADDRINUSE); 237 } 238 } 239 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 240 lport, wild); 241 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ? 242 intotw(t)->tw_so_options : 243 t->inp_socket->so_options)) == 0) 244 return (EADDRINUSE); 245 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 246 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 247 struct sockaddr_in sin; 248 249 in6_sin6_2_sin(&sin, sin6); 250 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 251 lport, wild); 252 if (t && t->inp_vflag & INP_TIMEWAIT) { 253 if ((reuseport & 254 intotw(t)->tw_so_options) == 0 && 255 (ntohl(t->inp_laddr.s_addr) != 256 INADDR_ANY || ((inp->inp_vflag & 257 INP_IPV6PROTO) == 258 (t->inp_vflag & INP_IPV6PROTO)))) 259 return (EADDRINUSE); 260 } 261 else if (t && 262 (reuseport & t->inp_socket->so_options) 263 == 0 && (ntohl(t->inp_laddr.s_addr) != 264 INADDR_ANY || INP_SOCKAF(so) == 265 INP_SOCKAF(t->inp_socket))) 266 return (EADDRINUSE); 267 } 268 } 269 inp->in6p_laddr = sin6->sin6_addr; 270 } 271 if (lport == 0) { 272 int e; 273 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) 274 return (e); 275 } 276 else { 277 inp->inp_lport = lport; 278 if (in_pcbinshash(inp) != 0) { 279 inp->in6p_laddr = in6addr_any; 280 inp->inp_lport = 0; 281 return (EAGAIN); 282 } 283 } 284 return (0); 285 } 286 287 /* 288 * Transform old in6_pcbconnect() into an inner subroutine for new 289 * in6_pcbconnect(): Do some validity-checking on the remote 290 * address (in mbuf 'nam') and then determine local host address 291 * (i.e., which interface) to use to access that remote host. 292 * 293 * This preserves definition of in6_pcbconnect(), while supporting a 294 * slightly different version for T/TCP. (This is more than 295 * a bit of a kludge, but cleaning up the internal interfaces would 296 * have forced minor changes in every protocol). 297 */ 298 299 int 300 in6_pcbladdr(inp, nam, plocal_addr6) 301 register struct inpcb *inp; 302 struct sockaddr *nam; 303 struct in6_addr **plocal_addr6; 304 { 305 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 306 struct ifnet *ifp = NULL; 307 int error = 0; 308 309 if (nam->sa_len != sizeof (*sin6)) 310 return (EINVAL); 311 if (sin6->sin6_family != AF_INET6) 312 return (EAFNOSUPPORT); 313 if (sin6->sin6_port == 0) 314 return (EADDRNOTAVAIL); 315 316 /* KAME hack: embed scopeid */ 317 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 318 return EINVAL; 319 320 if (in6_ifaddr) { 321 /* 322 * If the destination address is UNSPECIFIED addr, 323 * use the loopback addr, e.g ::1. 324 */ 325 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 326 sin6->sin6_addr = in6addr_loopback; 327 } 328 { 329 /* 330 * XXX: in6_selectsrc might replace the bound local address 331 * with the address specified by setsockopt(IPV6_PKTINFO). 332 * Is it the intended behavior? 333 */ 334 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 335 inp->in6p_moptions, NULL, 336 &inp->in6p_laddr, &error); 337 if (*plocal_addr6 == 0) { 338 if (error == 0) 339 error = EADDRNOTAVAIL; 340 return (error); 341 } 342 /* 343 * Don't do pcblookup call here; return interface in 344 * plocal_addr6 345 * and exit to caller, that will do the lookup. 346 */ 347 } 348 return (0); 349 } 350 351 /* 352 * Outer subroutine: 353 * Connect from a socket to a specified address. 354 * Both address and port must be specified in argument sin. 355 * If don't have a local address for this socket yet, 356 * then pick one. 357 */ 358 int 359 in6_pcbconnect(inp, nam, cred) 360 register struct inpcb *inp; 361 struct sockaddr *nam; 362 struct ucred *cred; 363 { 364 struct in6_addr *addr6; 365 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 366 int error; 367 368 /* 369 * Call inner routine, to assign local interface address. 370 * in6_pcbladdr() may automatically fill in sin6_scope_id. 371 */ 372 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 373 return (error); 374 375 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 376 sin6->sin6_port, 377 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 378 ? addr6 : &inp->in6p_laddr, 379 inp->inp_lport, 0, NULL) != NULL) { 380 return (EADDRINUSE); 381 } 382 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 383 if (inp->inp_lport == 0) { 384 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 385 if (error) 386 return (error); 387 } 388 inp->in6p_laddr = *addr6; 389 } 390 inp->in6p_faddr = sin6->sin6_addr; 391 inp->inp_fport = sin6->sin6_port; 392 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 393 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 394 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 395 inp->in6p_flowinfo |= 396 #ifdef RANDOM_IP_ID 397 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 398 #else 399 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 400 #endif 401 402 in_pcbrehash(inp); 403 #ifdef IPSEC 404 if (inp->inp_socket->so_type == SOCK_STREAM) 405 ipsec_pcbconn(inp->inp_sp); 406 #endif 407 return (0); 408 } 409 410 void 411 in6_pcbdisconnect(inp) 412 struct inpcb *inp; 413 { 414 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 415 inp->inp_fport = 0; 416 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 417 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 418 in_pcbrehash(inp); 419 #ifdef IPSEC 420 ipsec_pcbdisconn(inp->inp_sp); 421 #endif 422 if (inp->inp_socket->so_state & SS_NOFDREF) 423 in6_pcbdetach(inp); 424 } 425 426 void 427 in6_pcbdetach(inp) 428 struct inpcb *inp; 429 { 430 struct socket *so = inp->inp_socket; 431 struct inpcbinfo *ipi = inp->inp_pcbinfo; 432 433 #if defined(IPSEC) || defined(FAST_IPSEC) 434 if (inp->in6p_sp != NULL) 435 ipsec6_delete_pcbpolicy(inp); 436 #endif /* IPSEC */ 437 inp->inp_gencnt = ++ipi->ipi_gencnt; 438 in_pcbremlists(inp); 439 440 if (so) { 441 so->so_pcb = NULL; 442 sotryfree(so); 443 } 444 445 ip6_freepcbopts(inp->in6p_outputopts); 446 ip6_freemoptions(inp->in6p_moptions); 447 /* Check and free IPv4 related resources in case of mapped addr */ 448 if (inp->inp_options) 449 (void)m_free(inp->inp_options); 450 ip_freemoptions(inp->inp_moptions); 451 inp->inp_vflag = 0; 452 INP_LOCK_DESTROY(inp); 453 uma_zfree(ipi->ipi_zone, inp); 454 } 455 456 struct sockaddr * 457 in6_sockaddr(port, addr_p) 458 in_port_t port; 459 struct in6_addr *addr_p; 460 { 461 struct sockaddr_in6 *sin6; 462 463 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 464 bzero(sin6, sizeof *sin6); 465 sin6->sin6_family = AF_INET6; 466 sin6->sin6_len = sizeof(*sin6); 467 sin6->sin6_port = port; 468 sin6->sin6_addr = *addr_p; 469 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 470 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 471 else 472 sin6->sin6_scope_id = 0; /*XXX*/ 473 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 474 sin6->sin6_addr.s6_addr16[1] = 0; 475 476 return (struct sockaddr *)sin6; 477 } 478 479 struct sockaddr * 480 in6_v4mapsin6_sockaddr(port, addr_p) 481 in_port_t port; 482 struct in_addr *addr_p; 483 { 484 struct sockaddr_in sin; 485 struct sockaddr_in6 *sin6_p; 486 487 bzero(&sin, sizeof sin); 488 sin.sin_family = AF_INET; 489 sin.sin_len = sizeof(sin); 490 sin.sin_port = port; 491 sin.sin_addr = *addr_p; 492 493 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 494 M_WAITOK); 495 in6_sin_2_v4mapsin6(&sin, sin6_p); 496 497 return (struct sockaddr *)sin6_p; 498 } 499 500 /* 501 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 502 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 503 * in struct pr_usrreqs, so that protocols can just reference then directly 504 * without the need for a wrapper function. The socket must have a valid 505 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 506 * except through a kernel programming error, so it is acceptable to panic 507 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 508 * because there actually /is/ a programming error somewhere... XXX) 509 */ 510 int 511 in6_setsockaddr(so, nam) 512 struct socket *so; 513 struct sockaddr **nam; 514 { 515 int s; 516 register struct inpcb *inp; 517 struct in6_addr addr; 518 in_port_t port; 519 520 s = splnet(); 521 inp = sotoinpcb(so); 522 if (!inp) { 523 splx(s); 524 return EINVAL; 525 } 526 port = inp->inp_lport; 527 addr = inp->in6p_laddr; 528 splx(s); 529 530 *nam = in6_sockaddr(port, &addr); 531 return 0; 532 } 533 534 int 535 in6_setpeeraddr(so, nam) 536 struct socket *so; 537 struct sockaddr **nam; 538 { 539 int s; 540 struct inpcb *inp; 541 struct in6_addr addr; 542 in_port_t port; 543 544 s = splnet(); 545 inp = sotoinpcb(so); 546 if (!inp) { 547 splx(s); 548 return EINVAL; 549 } 550 port = inp->inp_fport; 551 addr = inp->in6p_faddr; 552 splx(s); 553 554 *nam = in6_sockaddr(port, &addr); 555 return 0; 556 } 557 558 int 559 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 560 { 561 struct inpcb *inp = sotoinpcb(so); 562 int error; 563 564 if (inp == NULL) 565 return EINVAL; 566 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 567 error = in_setsockaddr(so, nam, &tcbinfo); 568 if (error == 0) 569 in6_sin_2_v4mapsin6_in_sock(nam); 570 } else { 571 /* scope issues will be handled in in6_setsockaddr(). */ 572 error = in6_setsockaddr(so, nam); 573 } 574 575 return error; 576 } 577 578 int 579 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 580 { 581 struct inpcb *inp = sotoinpcb(so); 582 int error; 583 584 if (inp == NULL) 585 return EINVAL; 586 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 587 error = in_setpeeraddr(so, nam, &tcbinfo); 588 if (error == 0) 589 in6_sin_2_v4mapsin6_in_sock(nam); 590 } else 591 /* scope issues will be handled in in6_setpeeraddr(). */ 592 error = in6_setpeeraddr(so, nam); 593 594 return error; 595 } 596 597 /* 598 * Pass some notification to all connections of a protocol 599 * associated with address dst. The local address and/or port numbers 600 * may be specified to limit the search. The "usual action" will be 601 * taken, depending on the ctlinput cmd. The caller must filter any 602 * cmds that are uninteresting (e.g., no error in the map). 603 * Call the protocol specific routine (if any) to report 604 * any errors for each matching socket. 605 * 606 * Must be called at splnet. 607 */ 608 void 609 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 610 struct inpcbhead *head; 611 struct sockaddr *dst; 612 const struct sockaddr *src; 613 u_int fport_arg, lport_arg; 614 int cmd; 615 void *cmdarg; 616 struct inpcb *(*notify) __P((struct inpcb *, int)); 617 { 618 struct inpcb *inp, *ninp; 619 struct sockaddr_in6 sa6_src, *sa6_dst; 620 u_short fport = fport_arg, lport = lport_arg; 621 u_int32_t flowinfo; 622 int errno, s; 623 624 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 625 return; 626 627 sa6_dst = (struct sockaddr_in6 *)dst; 628 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 629 return; 630 631 /* 632 * note that src can be NULL when we get notify by local fragmentation. 633 */ 634 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 635 flowinfo = sa6_src.sin6_flowinfo; 636 637 /* 638 * Redirects go to all references to the destination, 639 * and use in6_rtchange to invalidate the route cache. 640 * Dead host indications: also use in6_rtchange to invalidate 641 * the cache, and deliver the error to all the sockets. 642 * Otherwise, if we have knowledge of the local port and address, 643 * deliver only to that socket. 644 */ 645 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 646 fport = 0; 647 lport = 0; 648 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 649 650 if (cmd != PRC_HOSTDEAD) 651 notify = in6_rtchange; 652 } 653 errno = inet6ctlerrmap[cmd]; 654 s = splnet(); 655 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 656 ninp = LIST_NEXT(inp, inp_list); 657 658 if ((inp->inp_vflag & INP_IPV6) == 0) 659 continue; 660 661 /* 662 * If the error designates a new path MTU for a destination 663 * and the application (associated with this socket) wanted to 664 * know the value, notify. Note that we notify for all 665 * disconnected sockets if the corresponding application 666 * wanted. This is because some UDP applications keep sending 667 * sockets disconnected. 668 * XXX: should we avoid to notify the value to TCP sockets? 669 */ 670 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 671 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 672 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 673 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 674 (u_int32_t *)cmdarg); 675 } 676 677 /* 678 * Detect if we should notify the error. If no source and 679 * destination ports are specifed, but non-zero flowinfo and 680 * local address match, notify the error. This is the case 681 * when the error is delivered with an encrypted buffer 682 * by ESP. Otherwise, just compare addresses and ports 683 * as usual. 684 */ 685 if (lport == 0 && fport == 0 && flowinfo && 686 inp->inp_socket != NULL && 687 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 688 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 689 goto do_notify; 690 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 691 &sa6_dst->sin6_addr) || 692 inp->inp_socket == 0 || 693 (lport && inp->inp_lport != lport) || 694 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 695 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 696 &sa6_src.sin6_addr)) || 697 (fport && inp->inp_fport != fport)) 698 continue; 699 700 do_notify: 701 if (notify) 702 (*notify)(inp, errno); 703 } 704 splx(s); 705 } 706 707 /* 708 * Lookup a PCB based on the local address and port. 709 */ 710 struct inpcb * 711 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 712 struct inpcbinfo *pcbinfo; 713 struct in6_addr *laddr; 714 u_int lport_arg; 715 int wild_okay; 716 { 717 register struct inpcb *inp; 718 int matchwild = 3, wildcard; 719 u_short lport = lport_arg; 720 721 if (!wild_okay) { 722 struct inpcbhead *head; 723 /* 724 * Look for an unconnected (wildcard foreign addr) PCB that 725 * matches the local address and port we're looking for. 726 */ 727 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 728 pcbinfo->hashmask)]; 729 LIST_FOREACH(inp, head, inp_hash) { 730 if ((inp->inp_vflag & INP_IPV6) == 0) 731 continue; 732 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 733 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 734 inp->inp_lport == lport) { 735 /* 736 * Found. 737 */ 738 return (inp); 739 } 740 } 741 /* 742 * Not found. 743 */ 744 return (NULL); 745 } else { 746 struct inpcbporthead *porthash; 747 struct inpcbport *phd; 748 struct inpcb *match = NULL; 749 /* 750 * Best fit PCB lookup. 751 * 752 * First see if this local port is in use by looking on the 753 * port hash list. 754 */ 755 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 756 pcbinfo->porthashmask)]; 757 LIST_FOREACH(phd, porthash, phd_hash) { 758 if (phd->phd_port == lport) 759 break; 760 } 761 if (phd != NULL) { 762 /* 763 * Port is in use by one or more PCBs. Look for best 764 * fit. 765 */ 766 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 767 wildcard = 0; 768 if ((inp->inp_vflag & INP_IPV6) == 0) 769 continue; 770 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 771 wildcard++; 772 if (!IN6_IS_ADDR_UNSPECIFIED( 773 &inp->in6p_laddr)) { 774 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 775 wildcard++; 776 else if (!IN6_ARE_ADDR_EQUAL( 777 &inp->in6p_laddr, laddr)) 778 continue; 779 } else { 780 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 781 wildcard++; 782 } 783 if (wildcard < matchwild) { 784 match = inp; 785 matchwild = wildcard; 786 if (matchwild == 0) { 787 break; 788 } 789 } 790 } 791 } 792 return (match); 793 } 794 } 795 796 void 797 in6_pcbpurgeif0(head, ifp) 798 struct in6pcb *head; 799 struct ifnet *ifp; 800 { 801 struct in6pcb *in6p; 802 struct ip6_moptions *im6o; 803 struct in6_multi_mship *imm, *nimm; 804 805 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 806 im6o = in6p->in6p_moptions; 807 if ((in6p->inp_vflag & INP_IPV6) && 808 im6o) { 809 /* 810 * Unselect the outgoing interface if it is being 811 * detached. 812 */ 813 if (im6o->im6o_multicast_ifp == ifp) 814 im6o->im6o_multicast_ifp = NULL; 815 816 /* 817 * Drop multicast group membership if we joined 818 * through the interface being detached. 819 * XXX controversial - is it really legal for kernel 820 * to force this? 821 */ 822 for (imm = im6o->im6o_memberships.lh_first; 823 imm != NULL; imm = nimm) { 824 nimm = imm->i6mm_chain.le_next; 825 if (imm->i6mm_maddr->in6m_ifp == ifp) { 826 LIST_REMOVE(imm, i6mm_chain); 827 in6_delmulti(imm->i6mm_maddr); 828 free(imm, M_IPMADDR); 829 } 830 } 831 } 832 } 833 } 834 835 /* 836 * Check for alternatives when higher level complains 837 * about service problems. For now, invalidate cached 838 * routing information. If the route was created dynamically 839 * (by a redirect), time to try a default gateway again. 840 */ 841 void 842 in6_losing(in6p) 843 struct inpcb *in6p; 844 { 845 /* 846 * We don't store route pointers in the routing table anymore 847 */ 848 return; 849 } 850 851 /* 852 * After a routing change, flush old routing 853 * and allocate a (hopefully) better one. 854 */ 855 struct inpcb * 856 in6_rtchange(inp, errno) 857 struct inpcb *inp; 858 int errno; 859 { 860 /* 861 * We don't store route pointers in the routing table anymore 862 */ 863 return inp; 864 } 865 866 /* 867 * Lookup PCB in hash list. 868 */ 869 struct inpcb * 870 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 871 struct inpcbinfo *pcbinfo; 872 struct in6_addr *faddr, *laddr; 873 u_int fport_arg, lport_arg; 874 int wildcard; 875 struct ifnet *ifp; 876 { 877 struct inpcbhead *head; 878 register struct inpcb *inp; 879 u_short fport = fport_arg, lport = lport_arg; 880 int faith; 881 882 if (faithprefix_p != NULL) 883 faith = (*faithprefix_p)(laddr); 884 else 885 faith = 0; 886 887 /* 888 * First look for an exact match. 889 */ 890 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 891 lport, fport, 892 pcbinfo->hashmask)]; 893 LIST_FOREACH(inp, head, inp_hash) { 894 if ((inp->inp_vflag & INP_IPV6) == 0) 895 continue; 896 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 897 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 898 inp->inp_fport == fport && 899 inp->inp_lport == lport) { 900 /* 901 * Found. 902 */ 903 return (inp); 904 } 905 } 906 if (wildcard) { 907 struct inpcb *local_wild = NULL; 908 909 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 910 pcbinfo->hashmask)]; 911 LIST_FOREACH(inp, head, inp_hash) { 912 if ((inp->inp_vflag & INP_IPV6) == 0) 913 continue; 914 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 915 inp->inp_lport == lport) { 916 if (faith && (inp->inp_flags & INP_FAITH) == 0) 917 continue; 918 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 919 laddr)) 920 return (inp); 921 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 922 local_wild = inp; 923 } 924 } 925 return (local_wild); 926 } 927 928 /* 929 * Not found. 930 */ 931 return (NULL); 932 } 933 934 void 935 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 936 { 937 struct ip6_hdr *ip; 938 939 ip = mtod(m, struct ip6_hdr *); 940 bzero(sin6, sizeof(*sin6)); 941 sin6->sin6_len = sizeof(*sin6); 942 sin6->sin6_family = AF_INET6; 943 sin6->sin6_addr = ip->ip6_src; 944 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 945 sin6->sin6_addr.s6_addr16[1] = 0; 946 sin6->sin6_scope_id = 947 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 948 ? m->m_pkthdr.rcvif->if_index : 0; 949 950 return; 951 } 952