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sys/netinet6/in6_pcb.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * Copyright (c) 2010-2011 Juniper Networks, Inc. 6 * All rights reserved. 7 * 8 * Portions of this software were developed by Robert N. M. Watson under 9 * contract to Juniper Networks, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the project nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ 36 */ 37 38 /*- 39 * Copyright (c) 1982, 1986, 1991, 1993 40 * The Regents of the University of California. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 67 */ 68 69 #include <sys/cdefs.h> 70 __FBSDID("$FreeBSD$"); 71 72 #include "opt_inet.h" 73 #include "opt_inet6.h" 74 #include "opt_ipsec.h" 75 #include "opt_route.h" 76 #include "opt_rss.h" 77 78 #include <sys/hash.h> 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/malloc.h> 82 #include <sys/mbuf.h> 83 #include <sys/domain.h> 84 #include <sys/protosw.h> 85 #include <sys/socket.h> 86 #include <sys/socketvar.h> 87 #include <sys/sockio.h> 88 #include <sys/errno.h> 89 #include <sys/time.h> 90 #include <sys/priv.h> 91 #include <sys/proc.h> 92 #include <sys/jail.h> 93 94 #include <vm/uma.h> 95 96 #include <net/if.h> 97 #include <net/if_var.h> 98 #include <net/if_llatbl.h> 99 #include <net/if_types.h> 100 #include <net/route.h> 101 #include <net/route/nhop.h> 102 103 #include <netinet/in.h> 104 #include <netinet/in_var.h> 105 #include <netinet/in_systm.h> 106 #include <netinet/ip6.h> 107 #include <netinet/ip_var.h> 108 109 #include <netinet6/ip6_var.h> 110 #include <netinet6/nd6.h> 111 #include <netinet/in_pcb.h> 112 #include <netinet/in_pcb_var.h> 113 #include <netinet6/in6_pcb.h> 114 #include <netinet6/in6_fib.h> 115 #include <netinet6/scope6_var.h> 116 117 int 118 in6_pcbsetport(struct in6_addr *laddr, struct inpcb *inp, struct ucred *cred) 119 { 120 struct socket *so = inp->inp_socket; 121 u_int16_t lport = 0; 122 int error, lookupflags = 0; 123 #ifdef INVARIANTS 124 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 125 #endif 126 127 INP_WLOCK_ASSERT(inp); 128 INP_HASH_WLOCK_ASSERT(pcbinfo); 129 130 error = prison_local_ip6(cred, laddr, 131 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0)); 132 if (error) 133 return(error); 134 135 /* XXX: this is redundant when called from in6_pcbbind */ 136 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT|SO_REUSEPORT_LB)) == 0) 137 lookupflags = INPLOOKUP_WILDCARD; 138 139 inp->inp_flags |= INP_ANONPORT; 140 141 error = in_pcb_lport(inp, NULL, &lport, cred, lookupflags); 142 if (error != 0) 143 return (error); 144 145 inp->inp_lport = lport; 146 if (in_pcbinshash(inp) != 0) { 147 inp->in6p_laddr = in6addr_any; 148 inp->inp_lport = 0; 149 return (EAGAIN); 150 } 151 152 return (0); 153 } 154 155 int 156 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, 157 struct ucred *cred) 158 { 159 struct socket *so = inp->inp_socket; 160 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 161 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 162 u_short lport = 0; 163 int error, lookupflags = 0; 164 int reuseport = (so->so_options & SO_REUSEPORT); 165 166 /* 167 * XXX: Maybe we could let SO_REUSEPORT_LB set SO_REUSEPORT bit here 168 * so that we don't have to add to the (already messy) code below. 169 */ 170 int reuseport_lb = (so->so_options & SO_REUSEPORT_LB); 171 172 INP_WLOCK_ASSERT(inp); 173 INP_HASH_WLOCK_ASSERT(pcbinfo); 174 175 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 176 return (EINVAL); 177 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT|SO_REUSEPORT_LB)) == 0) 178 lookupflags = INPLOOKUP_WILDCARD; 179 if (nam == NULL) { 180 if ((error = prison_local_ip6(cred, &inp->in6p_laddr, 181 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0) 182 return (error); 183 } else { 184 sin6 = (struct sockaddr_in6 *)nam; 185 KASSERT(sin6->sin6_family == AF_INET6, 186 ("%s: invalid address family for %p", __func__, sin6)); 187 KASSERT(sin6->sin6_len == sizeof(*sin6), 188 ("%s: invalid address length for %p", __func__, sin6)); 189 190 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 191 return(error); 192 193 if ((error = prison_local_ip6(cred, &sin6->sin6_addr, 194 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0) 195 return (error); 196 197 lport = sin6->sin6_port; 198 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 199 /* 200 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 201 * allow compepte duplication of binding if 202 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 203 * and a multicast address is bound on both 204 * new and duplicated sockets. 205 */ 206 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0) 207 reuseport = SO_REUSEADDR|SO_REUSEPORT; 208 /* 209 * XXX: How to deal with SO_REUSEPORT_LB here? 210 * Treat same as SO_REUSEPORT for now. 211 */ 212 if ((so->so_options & 213 (SO_REUSEADDR|SO_REUSEPORT_LB)) != 0) 214 reuseport_lb = SO_REUSEADDR|SO_REUSEPORT_LB; 215 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 216 struct epoch_tracker et; 217 struct ifaddr *ifa; 218 219 sin6->sin6_port = 0; /* yech... */ 220 NET_EPOCH_ENTER(et); 221 if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) == 222 NULL && 223 (inp->inp_flags & INP_BINDANY) == 0) { 224 NET_EPOCH_EXIT(et); 225 return (EADDRNOTAVAIL); 226 } 227 228 /* 229 * XXX: bind to an anycast address might accidentally 230 * cause sending a packet with anycast source address. 231 * We should allow to bind to a deprecated address, since 232 * the application dares to use it. 233 */ 234 if (ifa != NULL && 235 ((struct in6_ifaddr *)ifa)->ia6_flags & 236 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 237 NET_EPOCH_EXIT(et); 238 return (EADDRNOTAVAIL); 239 } 240 NET_EPOCH_EXIT(et); 241 } 242 if (lport) { 243 struct inpcb *t; 244 245 /* GROSS */ 246 if (ntohs(lport) <= V_ipport_reservedhigh && 247 ntohs(lport) >= V_ipport_reservedlow && 248 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT)) 249 return (EACCES); 250 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 251 priv_check_cred(inp->inp_cred, PRIV_NETINET_REUSEPORT) != 0) { 252 t = in6_pcblookup_local(pcbinfo, 253 &sin6->sin6_addr, lport, 254 INPLOOKUP_WILDCARD, cred); 255 if (t && 256 ((inp->inp_flags2 & INP_BINDMULTI) == 0) && 257 (so->so_type != SOCK_STREAM || 258 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 259 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 260 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 261 (t->inp_flags2 & INP_REUSEPORT) || 262 (t->inp_flags2 & INP_REUSEPORT_LB) == 0) && 263 (inp->inp_cred->cr_uid != 264 t->inp_cred->cr_uid)) 265 return (EADDRINUSE); 266 267 /* 268 * If the socket is a BINDMULTI socket, then 269 * the credentials need to match and the 270 * original socket also has to have been bound 271 * with BINDMULTI. 272 */ 273 if (t && (! in_pcbbind_check_bindmulti(inp, t))) 274 return (EADDRINUSE); 275 276 #ifdef INET 277 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 278 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 279 struct sockaddr_in sin; 280 281 in6_sin6_2_sin(&sin, sin6); 282 t = in_pcblookup_local(pcbinfo, 283 sin.sin_addr, lport, 284 INPLOOKUP_WILDCARD, cred); 285 if (t && 286 ((inp->inp_flags2 & INP_BINDMULTI) == 0) && 287 (so->so_type != SOCK_STREAM || 288 ntohl(t->inp_faddr.s_addr) == 289 INADDR_ANY) && 290 (inp->inp_cred->cr_uid != 291 t->inp_cred->cr_uid)) 292 return (EADDRINUSE); 293 294 if (t && (! in_pcbbind_check_bindmulti(inp, t))) 295 return (EADDRINUSE); 296 } 297 #endif 298 } 299 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 300 lport, lookupflags, cred); 301 if (t && (reuseport & inp_so_options(t)) == 0 && 302 (reuseport_lb & inp_so_options(t)) == 0) { 303 return (EADDRINUSE); 304 } 305 #ifdef INET 306 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 307 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 308 struct sockaddr_in sin; 309 310 in6_sin6_2_sin(&sin, sin6); 311 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 312 lport, lookupflags, cred); 313 if (t && 314 (reuseport & inp_so_options(t)) == 0 && 315 (reuseport_lb & inp_so_options(t)) == 0 && 316 (ntohl(t->inp_laddr.s_addr) != INADDR_ANY || 317 (t->inp_vflag & INP_IPV6PROTO) != 0)) { 318 return (EADDRINUSE); 319 } 320 } 321 #endif 322 } 323 inp->in6p_laddr = sin6->sin6_addr; 324 } 325 if (lport == 0) { 326 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) { 327 /* Undo an address bind that may have occurred. */ 328 inp->in6p_laddr = in6addr_any; 329 return (error); 330 } 331 } else { 332 inp->inp_lport = lport; 333 if (in_pcbinshash(inp) != 0) { 334 inp->in6p_laddr = in6addr_any; 335 inp->inp_lport = 0; 336 return (EAGAIN); 337 } 338 } 339 return (0); 340 } 341 342 /* 343 * Transform old in6_pcbconnect() into an inner subroutine for new 344 * in6_pcbconnect(): Do some validity-checking on the remote 345 * address (in mbuf 'nam') and then determine local host address 346 * (i.e., which interface) to use to access that remote host. 347 * 348 * This preserves definition of in6_pcbconnect(), while supporting a 349 * slightly different version for T/TCP. (This is more than 350 * a bit of a kludge, but cleaning up the internal interfaces would 351 * have forced minor changes in every protocol). 352 */ 353 static int 354 in6_pcbladdr(struct inpcb *inp, struct sockaddr_in6 *sin6, 355 struct in6_addr *plocal_addr6) 356 { 357 int error = 0; 358 int scope_ambiguous = 0; 359 struct in6_addr in6a; 360 struct epoch_tracker et; 361 362 INP_WLOCK_ASSERT(inp); 363 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); /* XXXRW: why? */ 364 365 if (sin6->sin6_port == 0) 366 return (EADDRNOTAVAIL); 367 368 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 369 scope_ambiguous = 1; 370 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 371 return(error); 372 373 if (!CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) { 374 /* 375 * If the destination address is UNSPECIFIED addr, 376 * use the loopback addr, e.g ::1. 377 */ 378 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 379 sin6->sin6_addr = in6addr_loopback; 380 } 381 if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0) 382 return (error); 383 384 NET_EPOCH_ENTER(et); 385 error = in6_selectsrc_socket(sin6, inp->in6p_outputopts, 386 inp, inp->inp_cred, scope_ambiguous, &in6a, NULL); 387 NET_EPOCH_EXIT(et); 388 if (error) 389 return (error); 390 391 /* 392 * Do not update this earlier, in case we return with an error. 393 * 394 * XXX: this in6_selectsrc_socket result might replace the bound local 395 * address with the address specified by setsockopt(IPV6_PKTINFO). 396 * Is it the intended behavior? 397 */ 398 *plocal_addr6 = in6a; 399 400 /* 401 * Don't do pcblookup call here; return interface in 402 * plocal_addr6 403 * and exit to caller, that will do the lookup. 404 */ 405 406 return (0); 407 } 408 409 /* 410 * Outer subroutine: 411 * Connect from a socket to a specified address. 412 * Both address and port must be specified in argument sin. 413 * If don't have a local address for this socket yet, 414 * then pick one. 415 */ 416 int 417 in6_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam, 418 struct ucred *cred, struct mbuf *m, bool rehash) 419 { 420 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 421 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 422 struct sockaddr_in6 laddr6; 423 int error; 424 425 KASSERT(sin6->sin6_family == AF_INET6, 426 ("%s: invalid address family for %p", __func__, sin6)); 427 KASSERT(sin6->sin6_len == sizeof(*sin6), 428 ("%s: invalid address length for %p", __func__, sin6)); 429 430 bzero(&laddr6, sizeof(laddr6)); 431 laddr6.sin6_family = AF_INET6; 432 433 INP_WLOCK_ASSERT(inp); 434 INP_HASH_WLOCK_ASSERT(pcbinfo); 435 436 #ifdef ROUTE_MPATH 437 if (CALC_FLOWID_OUTBOUND) { 438 uint32_t hash_type, hash_val; 439 440 hash_val = fib6_calc_software_hash(&inp->in6p_laddr, 441 &sin6->sin6_addr, 0, sin6->sin6_port, 442 inp->inp_socket->so_proto->pr_protocol, &hash_type); 443 inp->inp_flowid = hash_val; 444 inp->inp_flowtype = hash_type; 445 } 446 #endif 447 /* 448 * Call inner routine, to assign local interface address. 449 * in6_pcbladdr() may automatically fill in sin6_scope_id. 450 */ 451 if ((error = in6_pcbladdr(inp, sin6, &laddr6.sin6_addr)) != 0) 452 return (error); 453 454 if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr, 455 sin6->sin6_port, 456 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 457 ? &laddr6.sin6_addr : &inp->in6p_laddr, 458 inp->inp_lport, 0, NULL, M_NODOM) != NULL) { 459 return (EADDRINUSE); 460 } 461 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 462 if (inp->inp_lport == 0) { 463 /* 464 * rehash was required to be true in the past for 465 * this case; retain that convention. However, 466 * we now call in_pcb_lport_dest rather than 467 * in6_pcbbind; the former does not insert into 468 * the hash table, the latter does. Change rehash 469 * to false to do the in_pcbinshash below. 470 */ 471 KASSERT(rehash == true, 472 ("Rehashing required for unbound inps")); 473 rehash = false; 474 error = in_pcb_lport_dest(inp, 475 (struct sockaddr *) &laddr6, &inp->inp_lport, 476 (struct sockaddr *) sin6, sin6->sin6_port, cred, 477 INPLOOKUP_WILDCARD); 478 if (error) 479 return (error); 480 } 481 inp->in6p_laddr = laddr6.sin6_addr; 482 } 483 inp->in6p_faddr = sin6->sin6_addr; 484 inp->inp_fport = sin6->sin6_port; 485 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 486 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 487 if (inp->inp_flags & IN6P_AUTOFLOWLABEL) 488 inp->inp_flow |= 489 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 490 491 if (rehash) { 492 in_pcbrehash(inp); 493 } else { 494 in_pcbinshash(inp); 495 } 496 497 return (0); 498 } 499 500 int 501 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred) 502 { 503 504 return (in6_pcbconnect_mbuf(inp, nam, cred, NULL, true)); 505 } 506 507 void 508 in6_pcbdisconnect(struct inpcb *inp) 509 { 510 511 INP_WLOCK_ASSERT(inp); 512 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 513 514 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 515 inp->inp_fport = 0; 516 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 517 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 518 in_pcbrehash(inp); 519 } 520 521 struct sockaddr * 522 in6_sockaddr(in_port_t port, struct in6_addr *addr_p) 523 { 524 struct sockaddr_in6 *sin6; 525 526 sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK); 527 bzero(sin6, sizeof *sin6); 528 sin6->sin6_family = AF_INET6; 529 sin6->sin6_len = sizeof(*sin6); 530 sin6->sin6_port = port; 531 sin6->sin6_addr = *addr_p; 532 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 533 534 return (struct sockaddr *)sin6; 535 } 536 537 struct sockaddr * 538 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p) 539 { 540 struct sockaddr_in sin; 541 struct sockaddr_in6 *sin6_p; 542 543 bzero(&sin, sizeof sin); 544 sin.sin_family = AF_INET; 545 sin.sin_len = sizeof(sin); 546 sin.sin_port = port; 547 sin.sin_addr = *addr_p; 548 549 sin6_p = malloc(sizeof *sin6_p, M_SONAME, 550 M_WAITOK); 551 in6_sin_2_v4mapsin6(&sin, sin6_p); 552 553 return (struct sockaddr *)sin6_p; 554 } 555 556 int 557 in6_getsockaddr(struct socket *so, struct sockaddr **nam) 558 { 559 struct inpcb *inp; 560 struct in6_addr addr; 561 in_port_t port; 562 563 inp = sotoinpcb(so); 564 KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL")); 565 566 INP_RLOCK(inp); 567 port = inp->inp_lport; 568 addr = inp->in6p_laddr; 569 INP_RUNLOCK(inp); 570 571 *nam = in6_sockaddr(port, &addr); 572 return 0; 573 } 574 575 int 576 in6_getpeeraddr(struct socket *so, struct sockaddr **nam) 577 { 578 struct inpcb *inp; 579 struct in6_addr addr; 580 in_port_t port; 581 582 inp = sotoinpcb(so); 583 KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL")); 584 585 INP_RLOCK(inp); 586 port = inp->inp_fport; 587 addr = inp->in6p_faddr; 588 INP_RUNLOCK(inp); 589 590 *nam = in6_sockaddr(port, &addr); 591 return 0; 592 } 593 594 int 595 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 596 { 597 struct inpcb *inp; 598 int error; 599 600 inp = sotoinpcb(so); 601 KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL")); 602 603 #ifdef INET 604 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 605 error = in_getsockaddr(so, nam); 606 if (error == 0) 607 in6_sin_2_v4mapsin6_in_sock(nam); 608 } else 609 #endif 610 { 611 /* scope issues will be handled in in6_getsockaddr(). */ 612 error = in6_getsockaddr(so, nam); 613 } 614 615 return error; 616 } 617 618 int 619 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 620 { 621 struct inpcb *inp; 622 int error; 623 624 inp = sotoinpcb(so); 625 KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL")); 626 627 #ifdef INET 628 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 629 error = in_getpeeraddr(so, nam); 630 if (error == 0) 631 in6_sin_2_v4mapsin6_in_sock(nam); 632 } else 633 #endif 634 /* scope issues will be handled in in6_getpeeraddr(). */ 635 error = in6_getpeeraddr(so, nam); 636 637 return error; 638 } 639 640 /* 641 * Pass some notification to all connections of a protocol 642 * associated with address dst. The local address and/or port numbers 643 * may be specified to limit the search. The "usual action" will be 644 * taken, depending on the ctlinput cmd. The caller must filter any 645 * cmds that are uninteresting (e.g., no error in the map). 646 * Call the protocol specific routine (if any) to report 647 * any errors for each matching socket. 648 */ 649 static bool 650 inp_match6(const struct inpcb *inp, void *v __unused) 651 { 652 653 return ((inp->inp_vflag & INP_IPV6) != 0); 654 } 655 656 void 657 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr_in6 *sa6_dst, 658 u_int fport_arg, const struct sockaddr_in6 *src, u_int lport_arg, 659 int errno, void *cmdarg, 660 struct inpcb *(*notify)(struct inpcb *, int)) 661 { 662 struct inpcb_iterator inpi = INP_ITERATOR(pcbinfo, INPLOOKUP_WLOCKPCB, 663 inp_match6, NULL); 664 struct inpcb *inp; 665 struct sockaddr_in6 sa6_src; 666 u_short fport = fport_arg, lport = lport_arg; 667 u_int32_t flowinfo; 668 669 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 670 return; 671 672 /* 673 * note that src can be NULL when we get notify by local fragmentation. 674 */ 675 sa6_src = (src == NULL) ? sa6_any : *src; 676 flowinfo = sa6_src.sin6_flowinfo; 677 678 while ((inp = inp_next(&inpi)) != NULL) { 679 INP_WLOCK_ASSERT(inp); 680 /* 681 * If the error designates a new path MTU for a destination 682 * and the application (associated with this socket) wanted to 683 * know the value, notify. 684 * XXX: should we avoid to notify the value to TCP sockets? 685 */ 686 if (errno == EMSGSIZE && cmdarg != NULL) 687 ip6_notify_pmtu(inp, sa6_dst, *(uint32_t *)cmdarg); 688 689 /* 690 * Detect if we should notify the error. If no source and 691 * destination ports are specified, but non-zero flowinfo and 692 * local address match, notify the error. This is the case 693 * when the error is delivered with an encrypted buffer 694 * by ESP. Otherwise, just compare addresses and ports 695 * as usual. 696 */ 697 if (lport == 0 && fport == 0 && flowinfo && 698 inp->inp_socket != NULL && 699 flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) && 700 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 701 goto do_notify; 702 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 703 &sa6_dst->sin6_addr) || 704 inp->inp_socket == 0 || 705 (lport && inp->inp_lport != lport) || 706 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 707 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 708 &sa6_src.sin6_addr)) || 709 (fport && inp->inp_fport != fport)) { 710 continue; 711 } 712 713 do_notify: 714 if (notify) 715 (*notify)(inp, errno); 716 } 717 } 718 719 /* 720 * Lookup a PCB based on the local address and port. Caller must hold the 721 * hash lock. No inpcb locks or references are acquired. 722 */ 723 struct inpcb * 724 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, 725 u_short lport, int lookupflags, struct ucred *cred) 726 { 727 struct inpcb *inp; 728 int matchwild = 3, wildcard; 729 730 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0, 731 ("%s: invalid lookup flags %d", __func__, lookupflags)); 732 733 INP_HASH_LOCK_ASSERT(pcbinfo); 734 735 if ((lookupflags & INPLOOKUP_WILDCARD) == 0) { 736 struct inpcbhead *head; 737 /* 738 * Look for an unconnected (wildcard foreign addr) PCB that 739 * matches the local address and port we're looking for. 740 */ 741 head = &pcbinfo->ipi_hashbase[INP_PCBHASH_WILD(lport, 742 pcbinfo->ipi_hashmask)]; 743 CK_LIST_FOREACH(inp, head, inp_hash) { 744 /* XXX inp locking */ 745 if ((inp->inp_vflag & INP_IPV6) == 0) 746 continue; 747 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 748 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 749 inp->inp_lport == lport) { 750 /* Found. */ 751 if (prison_equal_ip6(cred->cr_prison, 752 inp->inp_cred->cr_prison)) 753 return (inp); 754 } 755 } 756 /* 757 * Not found. 758 */ 759 return (NULL); 760 } else { 761 struct inpcbporthead *porthash; 762 struct inpcbport *phd; 763 struct inpcb *match = NULL; 764 /* 765 * Best fit PCB lookup. 766 * 767 * First see if this local port is in use by looking on the 768 * port hash list. 769 */ 770 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 771 pcbinfo->ipi_porthashmask)]; 772 CK_LIST_FOREACH(phd, porthash, phd_hash) { 773 if (phd->phd_port == lport) 774 break; 775 } 776 if (phd != NULL) { 777 /* 778 * Port is in use by one or more PCBs. Look for best 779 * fit. 780 */ 781 CK_LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 782 wildcard = 0; 783 if (!prison_equal_ip6(cred->cr_prison, 784 inp->inp_cred->cr_prison)) 785 continue; 786 /* XXX inp locking */ 787 if ((inp->inp_vflag & INP_IPV6) == 0) 788 continue; 789 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 790 wildcard++; 791 if (!IN6_IS_ADDR_UNSPECIFIED( 792 &inp->in6p_laddr)) { 793 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 794 wildcard++; 795 else if (!IN6_ARE_ADDR_EQUAL( 796 &inp->in6p_laddr, laddr)) 797 continue; 798 } else { 799 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 800 wildcard++; 801 } 802 if (wildcard < matchwild) { 803 match = inp; 804 matchwild = wildcard; 805 if (matchwild == 0) 806 break; 807 } 808 } 809 } 810 return (match); 811 } 812 } 813 814 static bool 815 in6_multi_match(const struct inpcb *inp, void *v __unused) 816 { 817 818 if ((inp->inp_vflag & INP_IPV6) && inp->in6p_moptions != NULL) 819 return (true); 820 else 821 return (false); 822 } 823 824 void 825 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 826 { 827 struct inpcb_iterator inpi = INP_ITERATOR(pcbinfo, INPLOOKUP_RLOCKPCB, 828 in6_multi_match, NULL); 829 struct inpcb *inp; 830 struct in6_multi *inm; 831 struct in6_mfilter *imf; 832 struct ip6_moptions *im6o; 833 834 IN6_MULTI_LOCK_ASSERT(); 835 836 while ((inp = inp_next(&inpi)) != NULL) { 837 INP_RLOCK_ASSERT(inp); 838 839 im6o = inp->in6p_moptions; 840 /* 841 * Unselect the outgoing ifp for multicast if it 842 * is being detached. 843 */ 844 if (im6o->im6o_multicast_ifp == ifp) 845 im6o->im6o_multicast_ifp = NULL; 846 /* 847 * Drop multicast group membership if we joined 848 * through the interface being detached. 849 */ 850 restart: 851 IP6_MFILTER_FOREACH(imf, &im6o->im6o_head) { 852 if ((inm = imf->im6f_in6m) == NULL) 853 continue; 854 if (inm->in6m_ifp != ifp) 855 continue; 856 ip6_mfilter_remove(&im6o->im6o_head, imf); 857 in6_leavegroup_locked(inm, NULL); 858 ip6_mfilter_free(imf); 859 goto restart; 860 } 861 } 862 } 863 864 /* 865 * Check for alternatives when higher level complains 866 * about service problems. For now, invalidate cached 867 * routing information. If the route was created dynamically 868 * (by a redirect), time to try a default gateway again. 869 */ 870 void 871 in6_losing(struct inpcb *inp) 872 { 873 874 RO_INVALIDATE_CACHE(&inp->inp_route6); 875 } 876 877 /* 878 * After a routing change, flush old routing 879 * and allocate a (hopefully) better one. 880 */ 881 struct inpcb * 882 in6_rtchange(struct inpcb *inp, int errno __unused) 883 { 884 885 RO_INVALIDATE_CACHE(&inp->inp_route6); 886 return inp; 887 } 888 889 static bool 890 in6_pcblookup_lb_numa_match(const struct inpcblbgroup *grp, int domain) 891 { 892 return (domain == M_NODOM || domain == grp->il_numa_domain); 893 } 894 895 static struct inpcb * 896 in6_pcblookup_lbgroup(const struct inpcbinfo *pcbinfo, 897 const struct in6_addr *laddr, uint16_t lport, const struct in6_addr *faddr, 898 uint16_t fport, int lookupflags, uint8_t domain) 899 { 900 const struct inpcblbgrouphead *hdr; 901 struct inpcblbgroup *grp; 902 struct inpcblbgroup *jail_exact, *jail_wild, *local_exact, *local_wild; 903 904 INP_HASH_LOCK_ASSERT(pcbinfo); 905 906 hdr = &pcbinfo->ipi_lbgrouphashbase[ 907 INP_PCBPORTHASH(lport, pcbinfo->ipi_lbgrouphashmask)]; 908 909 /* 910 * Search for an LB group match based on the following criteria: 911 * - prefer jailed groups to non-jailed groups 912 * - prefer exact source address matches to wildcard matches 913 * - prefer groups bound to the specified NUMA domain 914 */ 915 jail_exact = jail_wild = local_exact = local_wild = NULL; 916 CK_LIST_FOREACH(grp, hdr, il_list) { 917 bool injail; 918 919 #ifdef INET 920 if (!(grp->il_vflag & INP_IPV6)) 921 continue; 922 #endif 923 if (grp->il_lport != lport) 924 continue; 925 926 injail = prison_flag(grp->il_cred, PR_IP6) != 0; 927 if (injail && prison_check_ip6_locked(grp->il_cred->cr_prison, 928 laddr) != 0) 929 continue; 930 931 if (IN6_ARE_ADDR_EQUAL(&grp->il6_laddr, laddr)) { 932 if (injail) { 933 jail_exact = grp; 934 if (in6_pcblookup_lb_numa_match(grp, domain)) 935 /* This is a perfect match. */ 936 goto out; 937 } else if (local_exact == NULL || 938 in6_pcblookup_lb_numa_match(grp, domain)) { 939 local_exact = grp; 940 } 941 } else if (IN6_IS_ADDR_UNSPECIFIED(&grp->il6_laddr) && 942 (lookupflags & INPLOOKUP_WILDCARD) != 0) { 943 if (injail) { 944 if (jail_wild == NULL || 945 in6_pcblookup_lb_numa_match(grp, domain)) 946 jail_wild = grp; 947 } else if (local_wild == NULL || 948 in6_pcblookup_lb_numa_match(grp, domain)) { 949 local_wild = grp; 950 } 951 } 952 } 953 954 if (jail_exact != NULL) 955 grp = jail_exact; 956 else if (jail_wild != NULL) 957 grp = jail_wild; 958 else if (local_exact != NULL) 959 grp = local_exact; 960 else 961 grp = local_wild; 962 if (grp == NULL) 963 return (NULL); 964 out: 965 return (grp->il_inp[INP6_PCBLBGROUP_PKTHASH(faddr, lport, fport) % 966 grp->il_inpcnt]); 967 } 968 969 /* 970 * Lookup PCB in hash list. Used in in_pcb.c as well as here. 971 */ 972 struct inpcb * 973 in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 974 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, 975 int lookupflags, struct ifnet *ifp, uint8_t numa_domain) 976 { 977 struct inpcbhead *head; 978 struct inpcb *inp, *tmpinp; 979 u_short fport = fport_arg, lport = lport_arg; 980 981 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0, 982 ("%s: invalid lookup flags %d", __func__, lookupflags)); 983 984 INP_HASH_LOCK_ASSERT(pcbinfo); 985 986 /* 987 * First look for an exact match. 988 */ 989 tmpinp = NULL; 990 head = &pcbinfo->ipi_hashbase[INP6_PCBHASH(faddr, lport, fport, 991 pcbinfo->ipi_hashmask)]; 992 CK_LIST_FOREACH(inp, head, inp_hash) { 993 /* XXX inp locking */ 994 if ((inp->inp_vflag & INP_IPV6) == 0) 995 continue; 996 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 997 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 998 inp->inp_fport == fport && 999 inp->inp_lport == lport) { 1000 /* 1001 * XXX We should be able to directly return 1002 * the inp here, without any checks. 1003 * Well unless both bound with SO_REUSEPORT? 1004 */ 1005 if (prison_flag(inp->inp_cred, PR_IP6)) 1006 return (inp); 1007 if (tmpinp == NULL) 1008 tmpinp = inp; 1009 } 1010 } 1011 if (tmpinp != NULL) 1012 return (tmpinp); 1013 1014 /* 1015 * Then look for a wildcard match, if requested. 1016 */ 1017 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 1018 struct inpcb *local_wild = NULL, *local_exact = NULL; 1019 struct inpcb *jail_wild = NULL; 1020 int injail; 1021 1022 /* 1023 * First see if an LB group matches the request before scanning 1024 * all sockets on this port. 1025 */ 1026 inp = in6_pcblookup_lbgroup(pcbinfo, laddr, lport, faddr, 1027 fport, lookupflags, numa_domain); 1028 if (inp != NULL) 1029 return (inp); 1030 1031 /* 1032 * Order of socket selection - we always prefer jails. 1033 * 1. jailed, non-wild. 1034 * 2. jailed, wild. 1035 * 3. non-jailed, non-wild. 1036 * 4. non-jailed, wild. 1037 */ 1038 head = &pcbinfo->ipi_hashbase[INP_PCBHASH_WILD(lport, 1039 pcbinfo->ipi_hashmask)]; 1040 CK_LIST_FOREACH(inp, head, inp_hash) { 1041 /* XXX inp locking */ 1042 if ((inp->inp_vflag & INP_IPV6) == 0) 1043 continue; 1044 1045 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 1046 inp->inp_lport != lport) { 1047 continue; 1048 } 1049 1050 injail = prison_flag(inp->inp_cred, PR_IP6); 1051 if (injail) { 1052 if (prison_check_ip6_locked( 1053 inp->inp_cred->cr_prison, laddr) != 0) 1054 continue; 1055 } else { 1056 if (local_exact != NULL) 1057 continue; 1058 } 1059 1060 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) { 1061 if (injail) 1062 return (inp); 1063 else 1064 local_exact = inp; 1065 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 1066 if (injail) 1067 jail_wild = inp; 1068 else 1069 local_wild = inp; 1070 } 1071 } /* LIST_FOREACH */ 1072 1073 if (jail_wild != NULL) 1074 return (jail_wild); 1075 if (local_exact != NULL) 1076 return (local_exact); 1077 if (local_wild != NULL) 1078 return (local_wild); 1079 } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */ 1080 1081 /* 1082 * Not found. 1083 */ 1084 return (NULL); 1085 } 1086 1087 /* 1088 * Lookup PCB in hash list, using pcbinfo tables. This variation locks the 1089 * hash list lock, and will return the inpcb locked (i.e., requires 1090 * INPLOOKUP_LOCKPCB). 1091 */ 1092 static struct inpcb * 1093 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 1094 u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags, 1095 struct ifnet *ifp, uint8_t numa_domain) 1096 { 1097 struct inpcb *inp; 1098 1099 smr_enter(pcbinfo->ipi_smr); 1100 inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport, 1101 lookupflags & INPLOOKUP_WILDCARD, ifp, numa_domain); 1102 if (inp != NULL) { 1103 if (__predict_false(inp_smr_lock(inp, 1104 (lookupflags & INPLOOKUP_LOCKMASK)) == false)) 1105 inp = NULL; 1106 } else 1107 smr_exit(pcbinfo->ipi_smr); 1108 1109 return (inp); 1110 } 1111 1112 /* 1113 * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf 1114 * from which a pre-calculated hash value may be extracted. 1115 */ 1116 struct inpcb * 1117 in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport, 1118 struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp) 1119 { 1120 1121 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0, 1122 ("%s: invalid lookup flags %d", __func__, lookupflags)); 1123 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0, 1124 ("%s: LOCKPCB not set", __func__)); 1125 1126 return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport, 1127 lookupflags, ifp, M_NODOM)); 1128 } 1129 1130 struct inpcb * 1131 in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 1132 u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags, 1133 struct ifnet *ifp, struct mbuf *m) 1134 { 1135 1136 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0, 1137 ("%s: invalid lookup flags %d", __func__, lookupflags)); 1138 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0, 1139 ("%s: LOCKPCB not set", __func__)); 1140 1141 return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport, 1142 lookupflags, ifp, m->m_pkthdr.numa_domain)); 1143 } 1144 1145 void 1146 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m, int srcordst) 1147 { 1148 struct ip6_hdr *ip; 1149 1150 ip = mtod(m, struct ip6_hdr *); 1151 bzero(sin6, sizeof(*sin6)); 1152 sin6->sin6_len = sizeof(*sin6); 1153 sin6->sin6_family = AF_INET6; 1154 sin6->sin6_addr = srcordst ? ip->ip6_dst : ip->ip6_src; 1155 1156 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 1157 1158 return; 1159 }
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