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sys/netinet/in_pcb.c
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1 /*- 2 * Copyright (c) 1982, 1986, 1991, 1993, 1995 3 * The Regents of the University of California. 4 * Copyright (c) 2007-2009 Robert N. M. Watson 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 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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 * @(#)in_pcb.c 8.4 (Berkeley) 5/24/95 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: releng/10.3/sys/netinet/in_pcb.c 291652 2015-12-02 17:26:37Z fabient $"); 40 41 #include "opt_ddb.h" 42 #include "opt_ipsec.h" 43 #include "opt_inet.h" 44 #include "opt_inet6.h" 45 #include "opt_pcbgroup.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/callout.h> 52 #include <sys/domain.h> 53 #include <sys/protosw.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/priv.h> 57 #include <sys/proc.h> 58 #include <sys/refcount.h> 59 #include <sys/jail.h> 60 #include <sys/kernel.h> 61 #include <sys/sysctl.h> 62 63 #ifdef DDB 64 #include <ddb/ddb.h> 65 #endif 66 67 #include <vm/uma.h> 68 69 #include <net/if.h> 70 #include <net/if_types.h> 71 #include <net/route.h> 72 #include <net/vnet.h> 73 74 #if defined(INET) || defined(INET6) 75 #include <netinet/in.h> 76 #include <netinet/in_pcb.h> 77 #include <netinet/ip_var.h> 78 #include <netinet/tcp_var.h> 79 #include <netinet/udp.h> 80 #include <netinet/udp_var.h> 81 #endif 82 #ifdef INET 83 #include <netinet/in_var.h> 84 #endif 85 #ifdef INET6 86 #include <netinet/ip6.h> 87 #include <netinet6/in6_pcb.h> 88 #include <netinet6/in6_var.h> 89 #include <netinet6/ip6_var.h> 90 #endif /* INET6 */ 91 92 93 #ifdef IPSEC 94 #include <netipsec/ipsec.h> 95 #include <netipsec/key.h> 96 #endif /* IPSEC */ 97 98 #include <security/mac/mac_framework.h> 99 100 static struct callout ipport_tick_callout; 101 102 /* 103 * These configure the range of local port addresses assigned to 104 * "unspecified" outgoing connections/packets/whatever. 105 */ 106 VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1; /* 1023 */ 107 VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART; /* 600 */ 108 VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST; /* 10000 */ 109 VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST; /* 65535 */ 110 VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO; /* 49152 */ 111 VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO; /* 65535 */ 112 113 /* 114 * Reserved ports accessible only to root. There are significant 115 * security considerations that must be accounted for when changing these, 116 * but the security benefits can be great. Please be careful. 117 */ 118 VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1; /* 1023 */ 119 VNET_DEFINE(int, ipport_reservedlow); 120 121 /* Variables dealing with random ephemeral port allocation. */ 122 VNET_DEFINE(int, ipport_randomized) = 1; /* user controlled via sysctl */ 123 VNET_DEFINE(int, ipport_randomcps) = 10; /* user controlled via sysctl */ 124 VNET_DEFINE(int, ipport_randomtime) = 45; /* user controlled via sysctl */ 125 VNET_DEFINE(int, ipport_stoprandom); /* toggled by ipport_tick */ 126 VNET_DEFINE(int, ipport_tcpallocs); 127 static VNET_DEFINE(int, ipport_tcplastcount); 128 129 #define V_ipport_tcplastcount VNET(ipport_tcplastcount) 130 131 static void in_pcbremlists(struct inpcb *inp); 132 #ifdef INET 133 static struct inpcb *in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, 134 struct in_addr faddr, u_int fport_arg, 135 struct in_addr laddr, u_int lport_arg, 136 int lookupflags, struct ifnet *ifp); 137 138 #define RANGECHK(var, min, max) \ 139 if ((var) < (min)) { (var) = (min); } \ 140 else if ((var) > (max)) { (var) = (max); } 141 142 static int 143 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS) 144 { 145 int error; 146 147 error = sysctl_handle_int(oidp, arg1, arg2, req); 148 if (error == 0) { 149 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1); 150 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1); 151 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX); 152 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX); 153 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX); 154 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX); 155 } 156 return (error); 157 } 158 159 #undef RANGECHK 160 161 static SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, 162 "IP Ports"); 163 164 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, 165 CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowfirstauto), 0, 166 &sysctl_net_ipport_check, "I", ""); 167 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, 168 CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowlastauto), 0, 169 &sysctl_net_ipport_check, "I", ""); 170 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, first, 171 CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_firstauto), 0, 172 &sysctl_net_ipport_check, "I", ""); 173 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, last, 174 CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lastauto), 0, 175 &sysctl_net_ipport_check, "I", ""); 176 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, 177 CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hifirstauto), 0, 178 &sysctl_net_ipport_check, "I", ""); 179 SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, 180 CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hilastauto), 0, 181 &sysctl_net_ipport_check, "I", ""); 182 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh, 183 CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedhigh), 0, ""); 184 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow, 185 CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, ""); 186 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW, 187 &VNET_NAME(ipport_randomized), 0, "Enable random port allocation"); 188 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW, 189 &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port " 190 "allocations before switching to a sequental one"); 191 SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW, 192 &VNET_NAME(ipport_randomtime), 0, 193 "Minimum time to keep sequental port " 194 "allocation before switching to a random one"); 195 #endif /* INET */ 196 197 /* 198 * in_pcb.c: manage the Protocol Control Blocks. 199 * 200 * NOTE: It is assumed that most of these functions will be called with 201 * the pcbinfo lock held, and often, the inpcb lock held, as these utility 202 * functions often modify hash chains or addresses in pcbs. 203 */ 204 205 /* 206 * Initialize an inpcbinfo -- we should be able to reduce the number of 207 * arguments in time. 208 */ 209 void 210 in_pcbinfo_init(struct inpcbinfo *pcbinfo, const char *name, 211 struct inpcbhead *listhead, int hash_nelements, int porthash_nelements, 212 char *inpcbzone_name, uma_init inpcbzone_init, uma_fini inpcbzone_fini, 213 uint32_t inpcbzone_flags, u_int hashfields) 214 { 215 216 INP_INFO_LOCK_INIT(pcbinfo, name); 217 INP_HASH_LOCK_INIT(pcbinfo, "pcbinfohash"); /* XXXRW: argument? */ 218 #ifdef VIMAGE 219 pcbinfo->ipi_vnet = curvnet; 220 #endif 221 pcbinfo->ipi_listhead = listhead; 222 LIST_INIT(pcbinfo->ipi_listhead); 223 pcbinfo->ipi_count = 0; 224 pcbinfo->ipi_hashbase = hashinit(hash_nelements, M_PCB, 225 &pcbinfo->ipi_hashmask); 226 pcbinfo->ipi_porthashbase = hashinit(porthash_nelements, M_PCB, 227 &pcbinfo->ipi_porthashmask); 228 #ifdef PCBGROUP 229 in_pcbgroup_init(pcbinfo, hashfields, hash_nelements); 230 #endif 231 pcbinfo->ipi_zone = uma_zcreate(inpcbzone_name, sizeof(struct inpcb), 232 NULL, NULL, inpcbzone_init, inpcbzone_fini, UMA_ALIGN_PTR, 233 inpcbzone_flags); 234 uma_zone_set_max(pcbinfo->ipi_zone, maxsockets); 235 uma_zone_set_warning(pcbinfo->ipi_zone, 236 "kern.ipc.maxsockets limit reached"); 237 } 238 239 /* 240 * Destroy an inpcbinfo. 241 */ 242 void 243 in_pcbinfo_destroy(struct inpcbinfo *pcbinfo) 244 { 245 246 KASSERT(pcbinfo->ipi_count == 0, 247 ("%s: ipi_count = %u", __func__, pcbinfo->ipi_count)); 248 249 hashdestroy(pcbinfo->ipi_hashbase, M_PCB, pcbinfo->ipi_hashmask); 250 hashdestroy(pcbinfo->ipi_porthashbase, M_PCB, 251 pcbinfo->ipi_porthashmask); 252 #ifdef PCBGROUP 253 in_pcbgroup_destroy(pcbinfo); 254 #endif 255 uma_zdestroy(pcbinfo->ipi_zone); 256 INP_HASH_LOCK_DESTROY(pcbinfo); 257 INP_INFO_LOCK_DESTROY(pcbinfo); 258 } 259 260 /* 261 * Allocate a PCB and associate it with the socket. 262 * On success return with the PCB locked. 263 */ 264 int 265 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo) 266 { 267 struct inpcb *inp; 268 int error; 269 270 INP_INFO_WLOCK_ASSERT(pcbinfo); 271 error = 0; 272 inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT); 273 if (inp == NULL) 274 return (ENOBUFS); 275 bzero(inp, inp_zero_size); 276 inp->inp_pcbinfo = pcbinfo; 277 inp->inp_socket = so; 278 inp->inp_cred = crhold(so->so_cred); 279 inp->inp_inc.inc_fibnum = so->so_fibnum; 280 #ifdef MAC 281 error = mac_inpcb_init(inp, M_NOWAIT); 282 if (error != 0) 283 goto out; 284 mac_inpcb_create(so, inp); 285 #endif 286 #ifdef IPSEC 287 error = ipsec_init_policy(so, &inp->inp_sp); 288 if (error != 0) { 289 #ifdef MAC 290 mac_inpcb_destroy(inp); 291 #endif 292 goto out; 293 } 294 #endif /*IPSEC*/ 295 #ifdef INET6 296 if (INP_SOCKAF(so) == AF_INET6) { 297 inp->inp_vflag |= INP_IPV6PROTO; 298 if (V_ip6_v6only) 299 inp->inp_flags |= IN6P_IPV6_V6ONLY; 300 } 301 #endif 302 LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list); 303 pcbinfo->ipi_count++; 304 so->so_pcb = (caddr_t)inp; 305 #ifdef INET6 306 if (V_ip6_auto_flowlabel) 307 inp->inp_flags |= IN6P_AUTOFLOWLABEL; 308 #endif 309 INP_WLOCK(inp); 310 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 311 refcount_init(&inp->inp_refcount, 1); /* Reference from inpcbinfo */ 312 #if defined(IPSEC) || defined(MAC) 313 out: 314 if (error != 0) { 315 crfree(inp->inp_cred); 316 uma_zfree(pcbinfo->ipi_zone, inp); 317 } 318 #endif 319 return (error); 320 } 321 322 #ifdef INET 323 int 324 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred) 325 { 326 int anonport, error; 327 328 INP_WLOCK_ASSERT(inp); 329 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 330 331 if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY) 332 return (EINVAL); 333 anonport = nam == NULL || ((struct sockaddr_in *)nam)->sin_port == 0; 334 error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr, 335 &inp->inp_lport, cred); 336 if (error) 337 return (error); 338 if (in_pcbinshash(inp) != 0) { 339 inp->inp_laddr.s_addr = INADDR_ANY; 340 inp->inp_lport = 0; 341 return (EAGAIN); 342 } 343 if (anonport) 344 inp->inp_flags |= INP_ANONPORT; 345 return (0); 346 } 347 #endif 348 349 #if defined(INET) || defined(INET6) 350 int 351 in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp, 352 struct ucred *cred, int lookupflags) 353 { 354 struct inpcbinfo *pcbinfo; 355 struct inpcb *tmpinp; 356 unsigned short *lastport; 357 int count, dorandom, error; 358 u_short aux, first, last, lport; 359 #ifdef INET 360 struct in_addr laddr; 361 #endif 362 363 pcbinfo = inp->inp_pcbinfo; 364 365 /* 366 * Because no actual state changes occur here, a global write lock on 367 * the pcbinfo isn't required. 368 */ 369 INP_LOCK_ASSERT(inp); 370 INP_HASH_LOCK_ASSERT(pcbinfo); 371 372 if (inp->inp_flags & INP_HIGHPORT) { 373 first = V_ipport_hifirstauto; /* sysctl */ 374 last = V_ipport_hilastauto; 375 lastport = &pcbinfo->ipi_lasthi; 376 } else if (inp->inp_flags & INP_LOWPORT) { 377 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0); 378 if (error) 379 return (error); 380 first = V_ipport_lowfirstauto; /* 1023 */ 381 last = V_ipport_lowlastauto; /* 600 */ 382 lastport = &pcbinfo->ipi_lastlow; 383 } else { 384 first = V_ipport_firstauto; /* sysctl */ 385 last = V_ipport_lastauto; 386 lastport = &pcbinfo->ipi_lastport; 387 } 388 /* 389 * For UDP(-Lite), use random port allocation as long as the user 390 * allows it. For TCP (and as of yet unknown) connections, 391 * use random port allocation only if the user allows it AND 392 * ipport_tick() allows it. 393 */ 394 if (V_ipport_randomized && 395 (!V_ipport_stoprandom || pcbinfo == &V_udbinfo || 396 pcbinfo == &V_ulitecbinfo)) 397 dorandom = 1; 398 else 399 dorandom = 0; 400 /* 401 * It makes no sense to do random port allocation if 402 * we have the only port available. 403 */ 404 if (first == last) 405 dorandom = 0; 406 /* Make sure to not include UDP(-Lite) packets in the count. */ 407 if (pcbinfo != &V_udbinfo || pcbinfo != &V_ulitecbinfo) 408 V_ipport_tcpallocs++; 409 /* 410 * Instead of having two loops further down counting up or down 411 * make sure that first is always <= last and go with only one 412 * code path implementing all logic. 413 */ 414 if (first > last) { 415 aux = first; 416 first = last; 417 last = aux; 418 } 419 420 #ifdef INET 421 /* Make the compiler happy. */ 422 laddr.s_addr = 0; 423 if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) { 424 KASSERT(laddrp != NULL, ("%s: laddrp NULL for v4 inp %p", 425 __func__, inp)); 426 laddr = *laddrp; 427 } 428 #endif 429 tmpinp = NULL; /* Make compiler happy. */ 430 lport = *lportp; 431 432 if (dorandom) 433 *lastport = first + (arc4random() % (last - first)); 434 435 count = last - first; 436 437 do { 438 if (count-- < 0) /* completely used? */ 439 return (EADDRNOTAVAIL); 440 ++*lastport; 441 if (*lastport < first || *lastport > last) 442 *lastport = first; 443 lport = htons(*lastport); 444 445 #ifdef INET6 446 if ((inp->inp_vflag & INP_IPV6) != 0) 447 tmpinp = in6_pcblookup_local(pcbinfo, 448 &inp->in6p_laddr, lport, lookupflags, cred); 449 #endif 450 #if defined(INET) && defined(INET6) 451 else 452 #endif 453 #ifdef INET 454 tmpinp = in_pcblookup_local(pcbinfo, laddr, 455 lport, lookupflags, cred); 456 #endif 457 } while (tmpinp != NULL); 458 459 #ifdef INET 460 if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) 461 laddrp->s_addr = laddr.s_addr; 462 #endif 463 *lportp = lport; 464 465 return (0); 466 } 467 468 /* 469 * Return cached socket options. 470 */ 471 short 472 inp_so_options(const struct inpcb *inp) 473 { 474 short so_options; 475 476 so_options = 0; 477 478 if ((inp->inp_flags2 & INP_REUSEPORT) != 0) 479 so_options |= SO_REUSEPORT; 480 if ((inp->inp_flags2 & INP_REUSEADDR) != 0) 481 so_options |= SO_REUSEADDR; 482 return (so_options); 483 } 484 #endif /* INET || INET6 */ 485 486 #ifdef INET 487 /* 488 * Set up a bind operation on a PCB, performing port allocation 489 * as required, but do not actually modify the PCB. Callers can 490 * either complete the bind by setting inp_laddr/inp_lport and 491 * calling in_pcbinshash(), or they can just use the resulting 492 * port and address to authorise the sending of a once-off packet. 493 * 494 * On error, the values of *laddrp and *lportp are not changed. 495 */ 496 int 497 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp, 498 u_short *lportp, struct ucred *cred) 499 { 500 struct socket *so = inp->inp_socket; 501 struct sockaddr_in *sin; 502 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 503 struct in_addr laddr; 504 u_short lport = 0; 505 int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT); 506 int error; 507 508 /* 509 * No state changes, so read locks are sufficient here. 510 */ 511 INP_LOCK_ASSERT(inp); 512 INP_HASH_LOCK_ASSERT(pcbinfo); 513 514 if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */ 515 return (EADDRNOTAVAIL); 516 laddr.s_addr = *laddrp; 517 if (nam != NULL && laddr.s_addr != INADDR_ANY) 518 return (EINVAL); 519 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 520 lookupflags = INPLOOKUP_WILDCARD; 521 if (nam == NULL) { 522 if ((error = prison_local_ip4(cred, &laddr)) != 0) 523 return (error); 524 } else { 525 sin = (struct sockaddr_in *)nam; 526 if (nam->sa_len != sizeof (*sin)) 527 return (EINVAL); 528 #ifdef notdef 529 /* 530 * We should check the family, but old programs 531 * incorrectly fail to initialize it. 532 */ 533 if (sin->sin_family != AF_INET) 534 return (EAFNOSUPPORT); 535 #endif 536 error = prison_local_ip4(cred, &sin->sin_addr); 537 if (error) 538 return (error); 539 if (sin->sin_port != *lportp) { 540 /* Don't allow the port to change. */ 541 if (*lportp != 0) 542 return (EINVAL); 543 lport = sin->sin_port; 544 } 545 /* NB: lport is left as 0 if the port isn't being changed. */ 546 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 547 /* 548 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 549 * allow complete duplication of binding if 550 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 551 * and a multicast address is bound on both 552 * new and duplicated sockets. 553 */ 554 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0) 555 reuseport = SO_REUSEADDR|SO_REUSEPORT; 556 } else if (sin->sin_addr.s_addr != INADDR_ANY) { 557 sin->sin_port = 0; /* yech... */ 558 bzero(&sin->sin_zero, sizeof(sin->sin_zero)); 559 /* 560 * Is the address a local IP address? 561 * If INP_BINDANY is set, then the socket may be bound 562 * to any endpoint address, local or not. 563 */ 564 if ((inp->inp_flags & INP_BINDANY) == 0 && 565 ifa_ifwithaddr_check((struct sockaddr *)sin) == 0) 566 return (EADDRNOTAVAIL); 567 } 568 laddr = sin->sin_addr; 569 if (lport) { 570 struct inpcb *t; 571 struct tcptw *tw; 572 573 /* GROSS */ 574 if (ntohs(lport) <= V_ipport_reservedhigh && 575 ntohs(lport) >= V_ipport_reservedlow && 576 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 577 0)) 578 return (EACCES); 579 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) && 580 priv_check_cred(inp->inp_cred, 581 PRIV_NETINET_REUSEPORT, 0) != 0) { 582 t = in_pcblookup_local(pcbinfo, sin->sin_addr, 583 lport, INPLOOKUP_WILDCARD, cred); 584 /* 585 * XXX 586 * This entire block sorely needs a rewrite. 587 */ 588 if (t && 589 ((t->inp_flags & INP_TIMEWAIT) == 0) && 590 (so->so_type != SOCK_STREAM || 591 ntohl(t->inp_faddr.s_addr) == INADDR_ANY) && 592 (ntohl(sin->sin_addr.s_addr) != INADDR_ANY || 593 ntohl(t->inp_laddr.s_addr) != INADDR_ANY || 594 (t->inp_flags2 & INP_REUSEPORT) == 0) && 595 (inp->inp_cred->cr_uid != 596 t->inp_cred->cr_uid)) 597 return (EADDRINUSE); 598 } 599 t = in_pcblookup_local(pcbinfo, sin->sin_addr, 600 lport, lookupflags, cred); 601 if (t && (t->inp_flags & INP_TIMEWAIT)) { 602 /* 603 * XXXRW: If an incpb has had its timewait 604 * state recycled, we treat the address as 605 * being in use (for now). This is better 606 * than a panic, but not desirable. 607 */ 608 tw = intotw(t); 609 if (tw == NULL || 610 (reuseport & tw->tw_so_options) == 0) 611 return (EADDRINUSE); 612 } else if (t && (reuseport & inp_so_options(t)) == 0) { 613 #ifdef INET6 614 if (ntohl(sin->sin_addr.s_addr) != 615 INADDR_ANY || 616 ntohl(t->inp_laddr.s_addr) != 617 INADDR_ANY || 618 (inp->inp_vflag & INP_IPV6PROTO) == 0 || 619 (t->inp_vflag & INP_IPV6PROTO) == 0) 620 #endif 621 return (EADDRINUSE); 622 } 623 } 624 } 625 if (*lportp != 0) 626 lport = *lportp; 627 if (lport == 0) { 628 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags); 629 if (error != 0) 630 return (error); 631 632 } 633 *laddrp = laddr.s_addr; 634 *lportp = lport; 635 return (0); 636 } 637 638 /* 639 * Connect from a socket to a specified address. 640 * Both address and port must be specified in argument sin. 641 * If don't have a local address for this socket yet, 642 * then pick one. 643 */ 644 int 645 in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam, 646 struct ucred *cred, struct mbuf *m) 647 { 648 u_short lport, fport; 649 in_addr_t laddr, faddr; 650 int anonport, error; 651 652 INP_WLOCK_ASSERT(inp); 653 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 654 655 lport = inp->inp_lport; 656 laddr = inp->inp_laddr.s_addr; 657 anonport = (lport == 0); 658 error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport, 659 NULL, cred); 660 if (error) 661 return (error); 662 663 /* Do the initial binding of the local address if required. */ 664 if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) { 665 inp->inp_lport = lport; 666 inp->inp_laddr.s_addr = laddr; 667 if (in_pcbinshash(inp) != 0) { 668 inp->inp_laddr.s_addr = INADDR_ANY; 669 inp->inp_lport = 0; 670 return (EAGAIN); 671 } 672 } 673 674 /* Commit the remaining changes. */ 675 inp->inp_lport = lport; 676 inp->inp_laddr.s_addr = laddr; 677 inp->inp_faddr.s_addr = faddr; 678 inp->inp_fport = fport; 679 in_pcbrehash_mbuf(inp, m); 680 681 if (anonport) 682 inp->inp_flags |= INP_ANONPORT; 683 return (0); 684 } 685 686 int 687 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred) 688 { 689 690 return (in_pcbconnect_mbuf(inp, nam, cred, NULL)); 691 } 692 693 /* 694 * Do proper source address selection on an unbound socket in case 695 * of connect. Take jails into account as well. 696 */ 697 int 698 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr, 699 struct ucred *cred) 700 { 701 struct ifaddr *ifa; 702 struct sockaddr *sa; 703 struct sockaddr_in *sin; 704 struct route sro; 705 int error; 706 707 KASSERT(laddr != NULL, ("%s: laddr NULL", __func__)); 708 709 /* 710 * Bypass source address selection and use the primary jail IP 711 * if requested. 712 */ 713 if (cred != NULL && !prison_saddrsel_ip4(cred, laddr)) 714 return (0); 715 716 error = 0; 717 bzero(&sro, sizeof(sro)); 718 719 sin = (struct sockaddr_in *)&sro.ro_dst; 720 sin->sin_family = AF_INET; 721 sin->sin_len = sizeof(struct sockaddr_in); 722 sin->sin_addr.s_addr = faddr->s_addr; 723 724 /* 725 * If route is known our src addr is taken from the i/f, 726 * else punt. 727 * 728 * Find out route to destination. 729 */ 730 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0) 731 in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum); 732 733 /* 734 * If we found a route, use the address corresponding to 735 * the outgoing interface. 736 * 737 * Otherwise assume faddr is reachable on a directly connected 738 * network and try to find a corresponding interface to take 739 * the source address from. 740 */ 741 if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) { 742 struct in_ifaddr *ia; 743 struct ifnet *ifp; 744 745 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin)); 746 if (ia == NULL) 747 ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0)); 748 if (ia == NULL) { 749 error = ENETUNREACH; 750 goto done; 751 } 752 753 if (cred == NULL || !prison_flag(cred, PR_IP4)) { 754 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 755 ifa_free(&ia->ia_ifa); 756 goto done; 757 } 758 759 ifp = ia->ia_ifp; 760 ifa_free(&ia->ia_ifa); 761 ia = NULL; 762 IF_ADDR_RLOCK(ifp); 763 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 764 765 sa = ifa->ifa_addr; 766 if (sa->sa_family != AF_INET) 767 continue; 768 sin = (struct sockaddr_in *)sa; 769 if (prison_check_ip4(cred, &sin->sin_addr) == 0) { 770 ia = (struct in_ifaddr *)ifa; 771 break; 772 } 773 } 774 if (ia != NULL) { 775 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 776 IF_ADDR_RUNLOCK(ifp); 777 goto done; 778 } 779 IF_ADDR_RUNLOCK(ifp); 780 781 /* 3. As a last resort return the 'default' jail address. */ 782 error = prison_get_ip4(cred, laddr); 783 goto done; 784 } 785 786 /* 787 * If the outgoing interface on the route found is not 788 * a loopback interface, use the address from that interface. 789 * In case of jails do those three steps: 790 * 1. check if the interface address belongs to the jail. If so use it. 791 * 2. check if we have any address on the outgoing interface 792 * belonging to this jail. If so use it. 793 * 3. as a last resort return the 'default' jail address. 794 */ 795 if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) { 796 struct in_ifaddr *ia; 797 struct ifnet *ifp; 798 799 /* If not jailed, use the default returned. */ 800 if (cred == NULL || !prison_flag(cred, PR_IP4)) { 801 ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa; 802 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 803 goto done; 804 } 805 806 /* Jailed. */ 807 /* 1. Check if the iface address belongs to the jail. */ 808 sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr; 809 if (prison_check_ip4(cred, &sin->sin_addr) == 0) { 810 ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa; 811 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 812 goto done; 813 } 814 815 /* 816 * 2. Check if we have any address on the outgoing interface 817 * belonging to this jail. 818 */ 819 ia = NULL; 820 ifp = sro.ro_rt->rt_ifp; 821 IF_ADDR_RLOCK(ifp); 822 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 823 sa = ifa->ifa_addr; 824 if (sa->sa_family != AF_INET) 825 continue; 826 sin = (struct sockaddr_in *)sa; 827 if (prison_check_ip4(cred, &sin->sin_addr) == 0) { 828 ia = (struct in_ifaddr *)ifa; 829 break; 830 } 831 } 832 if (ia != NULL) { 833 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 834 IF_ADDR_RUNLOCK(ifp); 835 goto done; 836 } 837 IF_ADDR_RUNLOCK(ifp); 838 839 /* 3. As a last resort return the 'default' jail address. */ 840 error = prison_get_ip4(cred, laddr); 841 goto done; 842 } 843 844 /* 845 * The outgoing interface is marked with 'loopback net', so a route 846 * to ourselves is here. 847 * Try to find the interface of the destination address and then 848 * take the address from there. That interface is not necessarily 849 * a loopback interface. 850 * In case of jails, check that it is an address of the jail 851 * and if we cannot find, fall back to the 'default' jail address. 852 */ 853 if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) { 854 struct sockaddr_in sain; 855 struct in_ifaddr *ia; 856 857 bzero(&sain, sizeof(struct sockaddr_in)); 858 sain.sin_family = AF_INET; 859 sain.sin_len = sizeof(struct sockaddr_in); 860 sain.sin_addr.s_addr = faddr->s_addr; 861 862 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain))); 863 if (ia == NULL) 864 ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0)); 865 if (ia == NULL) 866 ia = ifatoia(ifa_ifwithaddr(sintosa(&sain))); 867 868 if (cred == NULL || !prison_flag(cred, PR_IP4)) { 869 if (ia == NULL) { 870 error = ENETUNREACH; 871 goto done; 872 } 873 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 874 ifa_free(&ia->ia_ifa); 875 goto done; 876 } 877 878 /* Jailed. */ 879 if (ia != NULL) { 880 struct ifnet *ifp; 881 882 ifp = ia->ia_ifp; 883 ifa_free(&ia->ia_ifa); 884 ia = NULL; 885 IF_ADDR_RLOCK(ifp); 886 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 887 888 sa = ifa->ifa_addr; 889 if (sa->sa_family != AF_INET) 890 continue; 891 sin = (struct sockaddr_in *)sa; 892 if (prison_check_ip4(cred, 893 &sin->sin_addr) == 0) { 894 ia = (struct in_ifaddr *)ifa; 895 break; 896 } 897 } 898 if (ia != NULL) { 899 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 900 IF_ADDR_RUNLOCK(ifp); 901 goto done; 902 } 903 IF_ADDR_RUNLOCK(ifp); 904 } 905 906 /* 3. As a last resort return the 'default' jail address. */ 907 error = prison_get_ip4(cred, laddr); 908 goto done; 909 } 910 911 done: 912 if (sro.ro_rt != NULL) 913 RTFREE(sro.ro_rt); 914 return (error); 915 } 916 917 /* 918 * Set up for a connect from a socket to the specified address. 919 * On entry, *laddrp and *lportp should contain the current local 920 * address and port for the PCB; these are updated to the values 921 * that should be placed in inp_laddr and inp_lport to complete 922 * the connect. 923 * 924 * On success, *faddrp and *fportp will be set to the remote address 925 * and port. These are not updated in the error case. 926 * 927 * If the operation fails because the connection already exists, 928 * *oinpp will be set to the PCB of that connection so that the 929 * caller can decide to override it. In all other cases, *oinpp 930 * is set to NULL. 931 */ 932 int 933 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam, 934 in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp, 935 struct inpcb **oinpp, struct ucred *cred) 936 { 937 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 938 struct in_ifaddr *ia; 939 struct inpcb *oinp; 940 struct in_addr laddr, faddr; 941 u_short lport, fport; 942 int error; 943 944 /* 945 * Because a global state change doesn't actually occur here, a read 946 * lock is sufficient. 947 */ 948 INP_LOCK_ASSERT(inp); 949 INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo); 950 951 if (oinpp != NULL) 952 *oinpp = NULL; 953 if (nam->sa_len != sizeof (*sin)) 954 return (EINVAL); 955 if (sin->sin_family != AF_INET) 956 return (EAFNOSUPPORT); 957 if (sin->sin_port == 0) 958 return (EADDRNOTAVAIL); 959 laddr.s_addr = *laddrp; 960 lport = *lportp; 961 faddr = sin->sin_addr; 962 fport = sin->sin_port; 963 964 if (!TAILQ_EMPTY(&V_in_ifaddrhead)) { 965 /* 966 * If the destination address is INADDR_ANY, 967 * use the primary local address. 968 * If the supplied address is INADDR_BROADCAST, 969 * and the primary interface supports broadcast, 970 * choose the broadcast address for that interface. 971 */ 972 if (faddr.s_addr == INADDR_ANY) { 973 IN_IFADDR_RLOCK(); 974 faddr = 975 IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr; 976 IN_IFADDR_RUNLOCK(); 977 if (cred != NULL && 978 (error = prison_get_ip4(cred, &faddr)) != 0) 979 return (error); 980 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) { 981 IN_IFADDR_RLOCK(); 982 if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags & 983 IFF_BROADCAST) 984 faddr = satosin(&TAILQ_FIRST( 985 &V_in_ifaddrhead)->ia_broadaddr)->sin_addr; 986 IN_IFADDR_RUNLOCK(); 987 } 988 } 989 if (laddr.s_addr == INADDR_ANY) { 990 error = in_pcbladdr(inp, &faddr, &laddr, cred); 991 /* 992 * If the destination address is multicast and an outgoing 993 * interface has been set as a multicast option, prefer the 994 * address of that interface as our source address. 995 */ 996 if (IN_MULTICAST(ntohl(faddr.s_addr)) && 997 inp->inp_moptions != NULL) { 998 struct ip_moptions *imo; 999 struct ifnet *ifp; 1000 1001 imo = inp->inp_moptions; 1002 if (imo->imo_multicast_ifp != NULL) { 1003 ifp = imo->imo_multicast_ifp; 1004 IN_IFADDR_RLOCK(); 1005 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1006 if ((ia->ia_ifp == ifp) && 1007 (cred == NULL || 1008 prison_check_ip4(cred, 1009 &ia->ia_addr.sin_addr) == 0)) 1010 break; 1011 } 1012 if (ia == NULL) 1013 error = EADDRNOTAVAIL; 1014 else { 1015 laddr = ia->ia_addr.sin_addr; 1016 error = 0; 1017 } 1018 IN_IFADDR_RUNLOCK(); 1019 } 1020 } 1021 if (error) 1022 return (error); 1023 } 1024 oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, fport, 1025 laddr, lport, 0, NULL); 1026 if (oinp != NULL) { 1027 if (oinpp != NULL) 1028 *oinpp = oinp; 1029 return (EADDRINUSE); 1030 } 1031 if (lport == 0) { 1032 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport, 1033 cred); 1034 if (error) 1035 return (error); 1036 } 1037 *laddrp = laddr.s_addr; 1038 *lportp = lport; 1039 *faddrp = faddr.s_addr; 1040 *fportp = fport; 1041 return (0); 1042 } 1043 1044 void 1045 in_pcbdisconnect(struct inpcb *inp) 1046 { 1047 1048 INP_WLOCK_ASSERT(inp); 1049 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 1050 1051 inp->inp_faddr.s_addr = INADDR_ANY; 1052 inp->inp_fport = 0; 1053 in_pcbrehash(inp); 1054 } 1055 #endif /* INET */ 1056 1057 /* 1058 * in_pcbdetach() is responsibe for disassociating a socket from an inpcb. 1059 * For most protocols, this will be invoked immediately prior to calling 1060 * in_pcbfree(). However, with TCP the inpcb may significantly outlive the 1061 * socket, in which case in_pcbfree() is deferred. 1062 */ 1063 void 1064 in_pcbdetach(struct inpcb *inp) 1065 { 1066 1067 KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__)); 1068 1069 inp->inp_socket->so_pcb = NULL; 1070 inp->inp_socket = NULL; 1071 } 1072 1073 /* 1074 * in_pcbref() bumps the reference count on an inpcb in order to maintain 1075 * stability of an inpcb pointer despite the inpcb lock being released. This 1076 * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded, 1077 * but where the inpcb lock may already held, or when acquiring a reference 1078 * via a pcbgroup. 1079 * 1080 * in_pcbref() should be used only to provide brief memory stability, and 1081 * must always be followed by a call to INP_WLOCK() and in_pcbrele() to 1082 * garbage collect the inpcb if it has been in_pcbfree()'d from another 1083 * context. Until in_pcbrele() has returned that the inpcb is still valid, 1084 * lock and rele are the *only* safe operations that may be performed on the 1085 * inpcb. 1086 * 1087 * While the inpcb will not be freed, releasing the inpcb lock means that the 1088 * connection's state may change, so the caller should be careful to 1089 * revalidate any cached state on reacquiring the lock. Drop the reference 1090 * using in_pcbrele(). 1091 */ 1092 void 1093 in_pcbref(struct inpcb *inp) 1094 { 1095 1096 KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__)); 1097 1098 refcount_acquire(&inp->inp_refcount); 1099 } 1100 1101 /* 1102 * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to 1103 * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we 1104 * return a flag indicating whether or not the inpcb remains valid. If it is 1105 * valid, we return with the inpcb lock held. 1106 * 1107 * Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a 1108 * reference on an inpcb. Historically more work was done here (actually, in 1109 * in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the 1110 * need for the pcbinfo lock in in_pcbrele(). Deferring the free is entirely 1111 * about memory stability (and continued use of the write lock). 1112 */ 1113 int 1114 in_pcbrele_rlocked(struct inpcb *inp) 1115 { 1116 struct inpcbinfo *pcbinfo; 1117 1118 KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__)); 1119 1120 INP_RLOCK_ASSERT(inp); 1121 1122 if (refcount_release(&inp->inp_refcount) == 0) { 1123 /* 1124 * If the inpcb has been freed, let the caller know, even if 1125 * this isn't the last reference. 1126 */ 1127 if (inp->inp_flags2 & INP_FREED) { 1128 INP_RUNLOCK(inp); 1129 return (1); 1130 } 1131 return (0); 1132 } 1133 1134 KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__)); 1135 1136 INP_RUNLOCK(inp); 1137 pcbinfo = inp->inp_pcbinfo; 1138 uma_zfree(pcbinfo->ipi_zone, inp); 1139 return (1); 1140 } 1141 1142 int 1143 in_pcbrele_wlocked(struct inpcb *inp) 1144 { 1145 struct inpcbinfo *pcbinfo; 1146 1147 KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__)); 1148 1149 INP_WLOCK_ASSERT(inp); 1150 1151 if (refcount_release(&inp->inp_refcount) == 0) { 1152 /* 1153 * If the inpcb has been freed, let the caller know, even if 1154 * this isn't the last reference. 1155 */ 1156 if (inp->inp_flags2 & INP_FREED) { 1157 INP_WUNLOCK(inp); 1158 return (1); 1159 } 1160 return (0); 1161 } 1162 1163 KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__)); 1164 1165 INP_WUNLOCK(inp); 1166 pcbinfo = inp->inp_pcbinfo; 1167 uma_zfree(pcbinfo->ipi_zone, inp); 1168 return (1); 1169 } 1170 1171 /* 1172 * Temporary wrapper. 1173 */ 1174 int 1175 in_pcbrele(struct inpcb *inp) 1176 { 1177 1178 return (in_pcbrele_wlocked(inp)); 1179 } 1180 1181 /* 1182 * Unconditionally schedule an inpcb to be freed by decrementing its 1183 * reference count, which should occur only after the inpcb has been detached 1184 * from its socket. If another thread holds a temporary reference (acquired 1185 * using in_pcbref()) then the free is deferred until that reference is 1186 * released using in_pcbrele(), but the inpcb is still unlocked. Almost all 1187 * work, including removal from global lists, is done in this context, where 1188 * the pcbinfo lock is held. 1189 */ 1190 void 1191 in_pcbfree(struct inpcb *inp) 1192 { 1193 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 1194 1195 KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__)); 1196 1197 INP_INFO_WLOCK_ASSERT(pcbinfo); 1198 INP_WLOCK_ASSERT(inp); 1199 1200 /* XXXRW: Do as much as possible here. */ 1201 #ifdef IPSEC 1202 if (inp->inp_sp != NULL) 1203 ipsec_delete_pcbpolicy(inp); 1204 #endif 1205 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 1206 in_pcbremlists(inp); 1207 #ifdef INET6 1208 if (inp->inp_vflag & INP_IPV6PROTO) { 1209 ip6_freepcbopts(inp->in6p_outputopts); 1210 if (inp->in6p_moptions != NULL) 1211 ip6_freemoptions(inp->in6p_moptions); 1212 } 1213 #endif 1214 if (inp->inp_options) 1215 (void)m_free(inp->inp_options); 1216 #ifdef INET 1217 if (inp->inp_moptions != NULL) 1218 inp_freemoptions(inp->inp_moptions); 1219 #endif 1220 inp->inp_vflag = 0; 1221 inp->inp_flags2 |= INP_FREED; 1222 crfree(inp->inp_cred); 1223 #ifdef MAC 1224 mac_inpcb_destroy(inp); 1225 #endif 1226 if (!in_pcbrele_wlocked(inp)) 1227 INP_WUNLOCK(inp); 1228 } 1229 1230 /* 1231 * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and 1232 * port reservation, and preventing it from being returned by inpcb lookups. 1233 * 1234 * It is used by TCP to mark an inpcb as unused and avoid future packet 1235 * delivery or event notification when a socket remains open but TCP has 1236 * closed. This might occur as a result of a shutdown()-initiated TCP close 1237 * or a RST on the wire, and allows the port binding to be reused while still 1238 * maintaining the invariant that so_pcb always points to a valid inpcb until 1239 * in_pcbdetach(). 1240 * 1241 * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by 1242 * in_pcbnotifyall() and in_pcbpurgeif0()? 1243 */ 1244 void 1245 in_pcbdrop(struct inpcb *inp) 1246 { 1247 1248 INP_WLOCK_ASSERT(inp); 1249 1250 /* 1251 * XXXRW: Possibly we should protect the setting of INP_DROPPED with 1252 * the hash lock...? 1253 */ 1254 inp->inp_flags |= INP_DROPPED; 1255 if (inp->inp_flags & INP_INHASHLIST) { 1256 struct inpcbport *phd = inp->inp_phd; 1257 1258 INP_HASH_WLOCK(inp->inp_pcbinfo); 1259 LIST_REMOVE(inp, inp_hash); 1260 LIST_REMOVE(inp, inp_portlist); 1261 if (LIST_FIRST(&phd->phd_pcblist) == NULL) { 1262 LIST_REMOVE(phd, phd_hash); 1263 free(phd, M_PCB); 1264 } 1265 INP_HASH_WUNLOCK(inp->inp_pcbinfo); 1266 inp->inp_flags &= ~INP_INHASHLIST; 1267 #ifdef PCBGROUP 1268 in_pcbgroup_remove(inp); 1269 #endif 1270 } 1271 } 1272 1273 #ifdef INET 1274 /* 1275 * Common routines to return the socket addresses associated with inpcbs. 1276 */ 1277 struct sockaddr * 1278 in_sockaddr(in_port_t port, struct in_addr *addr_p) 1279 { 1280 struct sockaddr_in *sin; 1281 1282 sin = malloc(sizeof *sin, M_SONAME, 1283 M_WAITOK | M_ZERO); 1284 sin->sin_family = AF_INET; 1285 sin->sin_len = sizeof(*sin); 1286 sin->sin_addr = *addr_p; 1287 sin->sin_port = port; 1288 1289 return (struct sockaddr *)sin; 1290 } 1291 1292 int 1293 in_getsockaddr(struct socket *so, struct sockaddr **nam) 1294 { 1295 struct inpcb *inp; 1296 struct in_addr addr; 1297 in_port_t port; 1298 1299 inp = sotoinpcb(so); 1300 KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL")); 1301 1302 INP_RLOCK(inp); 1303 port = inp->inp_lport; 1304 addr = inp->inp_laddr; 1305 INP_RUNLOCK(inp); 1306 1307 *nam = in_sockaddr(port, &addr); 1308 return 0; 1309 } 1310 1311 int 1312 in_getpeeraddr(struct socket *so, struct sockaddr **nam) 1313 { 1314 struct inpcb *inp; 1315 struct in_addr addr; 1316 in_port_t port; 1317 1318 inp = sotoinpcb(so); 1319 KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL")); 1320 1321 INP_RLOCK(inp); 1322 port = inp->inp_fport; 1323 addr = inp->inp_faddr; 1324 INP_RUNLOCK(inp); 1325 1326 *nam = in_sockaddr(port, &addr); 1327 return 0; 1328 } 1329 1330 void 1331 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno, 1332 struct inpcb *(*notify)(struct inpcb *, int)) 1333 { 1334 struct inpcb *inp, *inp_temp; 1335 1336 INP_INFO_WLOCK(pcbinfo); 1337 LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) { 1338 INP_WLOCK(inp); 1339 #ifdef INET6 1340 if ((inp->inp_vflag & INP_IPV4) == 0) { 1341 INP_WUNLOCK(inp); 1342 continue; 1343 } 1344 #endif 1345 if (inp->inp_faddr.s_addr != faddr.s_addr || 1346 inp->inp_socket == NULL) { 1347 INP_WUNLOCK(inp); 1348 continue; 1349 } 1350 if ((*notify)(inp, errno)) 1351 INP_WUNLOCK(inp); 1352 } 1353 INP_INFO_WUNLOCK(pcbinfo); 1354 } 1355 1356 void 1357 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 1358 { 1359 struct inpcb *inp; 1360 struct ip_moptions *imo; 1361 int i, gap; 1362 1363 INP_INFO_RLOCK(pcbinfo); 1364 LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) { 1365 INP_WLOCK(inp); 1366 imo = inp->inp_moptions; 1367 if ((inp->inp_vflag & INP_IPV4) && 1368 imo != NULL) { 1369 /* 1370 * Unselect the outgoing interface if it is being 1371 * detached. 1372 */ 1373 if (imo->imo_multicast_ifp == ifp) 1374 imo->imo_multicast_ifp = NULL; 1375 1376 /* 1377 * Drop multicast group membership if we joined 1378 * through the interface being detached. 1379 */ 1380 for (i = 0, gap = 0; i < imo->imo_num_memberships; 1381 i++) { 1382 if (imo->imo_membership[i]->inm_ifp == ifp) { 1383 in_delmulti(imo->imo_membership[i]); 1384 gap++; 1385 } else if (gap != 0) 1386 imo->imo_membership[i - gap] = 1387 imo->imo_membership[i]; 1388 } 1389 imo->imo_num_memberships -= gap; 1390 } 1391 INP_WUNLOCK(inp); 1392 } 1393 INP_INFO_RUNLOCK(pcbinfo); 1394 } 1395 1396 /* 1397 * Lookup a PCB based on the local address and port. Caller must hold the 1398 * hash lock. No inpcb locks or references are acquired. 1399 */ 1400 #define INP_LOOKUP_MAPPED_PCB_COST 3 1401 struct inpcb * 1402 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr, 1403 u_short lport, int lookupflags, struct ucred *cred) 1404 { 1405 struct inpcb *inp; 1406 #ifdef INET6 1407 int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST; 1408 #else 1409 int matchwild = 3; 1410 #endif 1411 int wildcard; 1412 1413 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0, 1414 ("%s: invalid lookup flags %d", __func__, lookupflags)); 1415 1416 INP_HASH_LOCK_ASSERT(pcbinfo); 1417 1418 if ((lookupflags & INPLOOKUP_WILDCARD) == 0) { 1419 struct inpcbhead *head; 1420 /* 1421 * Look for an unconnected (wildcard foreign addr) PCB that 1422 * matches the local address and port we're looking for. 1423 */ 1424 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 1425 0, pcbinfo->ipi_hashmask)]; 1426 LIST_FOREACH(inp, head, inp_hash) { 1427 #ifdef INET6 1428 /* XXX inp locking */ 1429 if ((inp->inp_vflag & INP_IPV4) == 0) 1430 continue; 1431 #endif 1432 if (inp->inp_faddr.s_addr == INADDR_ANY && 1433 inp->inp_laddr.s_addr == laddr.s_addr && 1434 inp->inp_lport == lport) { 1435 /* 1436 * Found? 1437 */ 1438 if (cred == NULL || 1439 prison_equal_ip4(cred->cr_prison, 1440 inp->inp_cred->cr_prison)) 1441 return (inp); 1442 } 1443 } 1444 /* 1445 * Not found. 1446 */ 1447 return (NULL); 1448 } else { 1449 struct inpcbporthead *porthash; 1450 struct inpcbport *phd; 1451 struct inpcb *match = NULL; 1452 /* 1453 * Best fit PCB lookup. 1454 * 1455 * First see if this local port is in use by looking on the 1456 * port hash list. 1457 */ 1458 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 1459 pcbinfo->ipi_porthashmask)]; 1460 LIST_FOREACH(phd, porthash, phd_hash) { 1461 if (phd->phd_port == lport) 1462 break; 1463 } 1464 if (phd != NULL) { 1465 /* 1466 * Port is in use by one or more PCBs. Look for best 1467 * fit. 1468 */ 1469 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 1470 wildcard = 0; 1471 if (cred != NULL && 1472 !prison_equal_ip4(inp->inp_cred->cr_prison, 1473 cred->cr_prison)) 1474 continue; 1475 #ifdef INET6 1476 /* XXX inp locking */ 1477 if ((inp->inp_vflag & INP_IPV4) == 0) 1478 continue; 1479 /* 1480 * We never select the PCB that has 1481 * INP_IPV6 flag and is bound to :: if 1482 * we have another PCB which is bound 1483 * to 0.0.0.0. If a PCB has the 1484 * INP_IPV6 flag, then we set its cost 1485 * higher than IPv4 only PCBs. 1486 * 1487 * Note that the case only happens 1488 * when a socket is bound to ::, under 1489 * the condition that the use of the 1490 * mapped address is allowed. 1491 */ 1492 if ((inp->inp_vflag & INP_IPV6) != 0) 1493 wildcard += INP_LOOKUP_MAPPED_PCB_COST; 1494 #endif 1495 if (inp->inp_faddr.s_addr != INADDR_ANY) 1496 wildcard++; 1497 if (inp->inp_laddr.s_addr != INADDR_ANY) { 1498 if (laddr.s_addr == INADDR_ANY) 1499 wildcard++; 1500 else if (inp->inp_laddr.s_addr != laddr.s_addr) 1501 continue; 1502 } else { 1503 if (laddr.s_addr != INADDR_ANY) 1504 wildcard++; 1505 } 1506 if (wildcard < matchwild) { 1507 match = inp; 1508 matchwild = wildcard; 1509 if (matchwild == 0) 1510 break; 1511 } 1512 } 1513 } 1514 return (match); 1515 } 1516 } 1517 #undef INP_LOOKUP_MAPPED_PCB_COST 1518 1519 #ifdef PCBGROUP 1520 /* 1521 * Lookup PCB in hash list, using pcbgroup tables. 1522 */ 1523 static struct inpcb * 1524 in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup, 1525 struct in_addr faddr, u_int fport_arg, struct in_addr laddr, 1526 u_int lport_arg, int lookupflags, struct ifnet *ifp) 1527 { 1528 struct inpcbhead *head; 1529 struct inpcb *inp, *tmpinp; 1530 u_short fport = fport_arg, lport = lport_arg; 1531 1532 /* 1533 * First look for an exact match. 1534 */ 1535 tmpinp = NULL; 1536 INP_GROUP_LOCK(pcbgroup); 1537 head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, 1538 pcbgroup->ipg_hashmask)]; 1539 LIST_FOREACH(inp, head, inp_pcbgrouphash) { 1540 #ifdef INET6 1541 /* XXX inp locking */ 1542 if ((inp->inp_vflag & INP_IPV4) == 0) 1543 continue; 1544 #endif 1545 if (inp->inp_faddr.s_addr == faddr.s_addr && 1546 inp->inp_laddr.s_addr == laddr.s_addr && 1547 inp->inp_fport == fport && 1548 inp->inp_lport == lport) { 1549 /* 1550 * XXX We should be able to directly return 1551 * the inp here, without any checks. 1552 * Well unless both bound with SO_REUSEPORT? 1553 */ 1554 if (prison_flag(inp->inp_cred, PR_IP4)) 1555 goto found; 1556 if (tmpinp == NULL) 1557 tmpinp = inp; 1558 } 1559 } 1560 if (tmpinp != NULL) { 1561 inp = tmpinp; 1562 goto found; 1563 } 1564 1565 /* 1566 * Then look for a wildcard match, if requested. 1567 */ 1568 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 1569 struct inpcb *local_wild = NULL, *local_exact = NULL; 1570 #ifdef INET6 1571 struct inpcb *local_wild_mapped = NULL; 1572 #endif 1573 struct inpcb *jail_wild = NULL; 1574 struct inpcbhead *head; 1575 int injail; 1576 1577 /* 1578 * Order of socket selection - we always prefer jails. 1579 * 1. jailed, non-wild. 1580 * 2. jailed, wild. 1581 * 3. non-jailed, non-wild. 1582 * 4. non-jailed, wild. 1583 */ 1584 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport, 1585 0, pcbinfo->ipi_wildmask)]; 1586 LIST_FOREACH(inp, head, inp_pcbgroup_wild) { 1587 #ifdef INET6 1588 /* XXX inp locking */ 1589 if ((inp->inp_vflag & INP_IPV4) == 0) 1590 continue; 1591 #endif 1592 if (inp->inp_faddr.s_addr != INADDR_ANY || 1593 inp->inp_lport != lport) 1594 continue; 1595 1596 /* XXX inp locking */ 1597 if (ifp && ifp->if_type == IFT_FAITH && 1598 (inp->inp_flags & INP_FAITH) == 0) 1599 continue; 1600 1601 injail = prison_flag(inp->inp_cred, PR_IP4); 1602 if (injail) { 1603 if (prison_check_ip4(inp->inp_cred, 1604 &laddr) != 0) 1605 continue; 1606 } else { 1607 if (local_exact != NULL) 1608 continue; 1609 } 1610 1611 if (inp->inp_laddr.s_addr == laddr.s_addr) { 1612 if (injail) 1613 goto found; 1614 else 1615 local_exact = inp; 1616 } else if (inp->inp_laddr.s_addr == INADDR_ANY) { 1617 #ifdef INET6 1618 /* XXX inp locking, NULL check */ 1619 if (inp->inp_vflag & INP_IPV6PROTO) 1620 local_wild_mapped = inp; 1621 else 1622 #endif 1623 if (injail) 1624 jail_wild = inp; 1625 else 1626 local_wild = inp; 1627 } 1628 } /* LIST_FOREACH */ 1629 inp = jail_wild; 1630 if (inp == NULL) 1631 inp = local_exact; 1632 if (inp == NULL) 1633 inp = local_wild; 1634 #ifdef INET6 1635 if (inp == NULL) 1636 inp = local_wild_mapped; 1637 #endif 1638 if (inp != NULL) 1639 goto found; 1640 } /* if (lookupflags & INPLOOKUP_WILDCARD) */ 1641 INP_GROUP_UNLOCK(pcbgroup); 1642 return (NULL); 1643 1644 found: 1645 in_pcbref(inp); 1646 INP_GROUP_UNLOCK(pcbgroup); 1647 if (lookupflags & INPLOOKUP_WLOCKPCB) { 1648 INP_WLOCK(inp); 1649 if (in_pcbrele_wlocked(inp)) 1650 return (NULL); 1651 } else if (lookupflags & INPLOOKUP_RLOCKPCB) { 1652 INP_RLOCK(inp); 1653 if (in_pcbrele_rlocked(inp)) 1654 return (NULL); 1655 } else 1656 panic("%s: locking bug", __func__); 1657 return (inp); 1658 } 1659 #endif /* PCBGROUP */ 1660 1661 /* 1662 * Lookup PCB in hash list, using pcbinfo tables. This variation assumes 1663 * that the caller has locked the hash list, and will not perform any further 1664 * locking or reference operations on either the hash list or the connection. 1665 */ 1666 static struct inpcb * 1667 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr, 1668 u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags, 1669 struct ifnet *ifp) 1670 { 1671 struct inpcbhead *head; 1672 struct inpcb *inp, *tmpinp; 1673 u_short fport = fport_arg, lport = lport_arg; 1674 1675 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0, 1676 ("%s: invalid lookup flags %d", __func__, lookupflags)); 1677 1678 INP_HASH_LOCK_ASSERT(pcbinfo); 1679 1680 /* 1681 * First look for an exact match. 1682 */ 1683 tmpinp = NULL; 1684 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, 1685 pcbinfo->ipi_hashmask)]; 1686 LIST_FOREACH(inp, head, inp_hash) { 1687 #ifdef INET6 1688 /* XXX inp locking */ 1689 if ((inp->inp_vflag & INP_IPV4) == 0) 1690 continue; 1691 #endif 1692 if (inp->inp_faddr.s_addr == faddr.s_addr && 1693 inp->inp_laddr.s_addr == laddr.s_addr && 1694 inp->inp_fport == fport && 1695 inp->inp_lport == lport) { 1696 /* 1697 * XXX We should be able to directly return 1698 * the inp here, without any checks. 1699 * Well unless both bound with SO_REUSEPORT? 1700 */ 1701 if (prison_flag(inp->inp_cred, PR_IP4)) 1702 return (inp); 1703 if (tmpinp == NULL) 1704 tmpinp = inp; 1705 } 1706 } 1707 if (tmpinp != NULL) 1708 return (tmpinp); 1709 1710 /* 1711 * Then look for a wildcard match, if requested. 1712 */ 1713 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 1714 struct inpcb *local_wild = NULL, *local_exact = NULL; 1715 #ifdef INET6 1716 struct inpcb *local_wild_mapped = NULL; 1717 #endif 1718 struct inpcb *jail_wild = NULL; 1719 int injail; 1720 1721 /* 1722 * Order of socket selection - we always prefer jails. 1723 * 1. jailed, non-wild. 1724 * 2. jailed, wild. 1725 * 3. non-jailed, non-wild. 1726 * 4. non-jailed, wild. 1727 */ 1728 1729 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 1730 0, pcbinfo->ipi_hashmask)]; 1731 LIST_FOREACH(inp, head, inp_hash) { 1732 #ifdef INET6 1733 /* XXX inp locking */ 1734 if ((inp->inp_vflag & INP_IPV4) == 0) 1735 continue; 1736 #endif 1737 if (inp->inp_faddr.s_addr != INADDR_ANY || 1738 inp->inp_lport != lport) 1739 continue; 1740 1741 /* XXX inp locking */ 1742 if (ifp && ifp->if_type == IFT_FAITH && 1743 (inp->inp_flags & INP_FAITH) == 0) 1744 continue; 1745 1746 injail = prison_flag(inp->inp_cred, PR_IP4); 1747 if (injail) { 1748 if (prison_check_ip4(inp->inp_cred, 1749 &laddr) != 0) 1750 continue; 1751 } else { 1752 if (local_exact != NULL) 1753 continue; 1754 } 1755 1756 if (inp->inp_laddr.s_addr == laddr.s_addr) { 1757 if (injail) 1758 return (inp); 1759 else 1760 local_exact = inp; 1761 } else if (inp->inp_laddr.s_addr == INADDR_ANY) { 1762 #ifdef INET6 1763 /* XXX inp locking, NULL check */ 1764 if (inp->inp_vflag & INP_IPV6PROTO) 1765 local_wild_mapped = inp; 1766 else 1767 #endif 1768 if (injail) 1769 jail_wild = inp; 1770 else 1771 local_wild = inp; 1772 } 1773 } /* LIST_FOREACH */ 1774 if (jail_wild != NULL) 1775 return (jail_wild); 1776 if (local_exact != NULL) 1777 return (local_exact); 1778 if (local_wild != NULL) 1779 return (local_wild); 1780 #ifdef INET6 1781 if (local_wild_mapped != NULL) 1782 return (local_wild_mapped); 1783 #endif 1784 } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */ 1785 1786 return (NULL); 1787 } 1788 1789 /* 1790 * Lookup PCB in hash list, using pcbinfo tables. This variation locks the 1791 * hash list lock, and will return the inpcb locked (i.e., requires 1792 * INPLOOKUP_LOCKPCB). 1793 */ 1794 static struct inpcb * 1795 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr, 1796 u_int fport, struct in_addr laddr, u_int lport, int lookupflags, 1797 struct ifnet *ifp) 1798 { 1799 struct inpcb *inp; 1800 1801 INP_HASH_RLOCK(pcbinfo); 1802 inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport, 1803 (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp); 1804 if (inp != NULL) { 1805 in_pcbref(inp); 1806 INP_HASH_RUNLOCK(pcbinfo); 1807 if (lookupflags & INPLOOKUP_WLOCKPCB) { 1808 INP_WLOCK(inp); 1809 if (in_pcbrele_wlocked(inp)) 1810 return (NULL); 1811 } else if (lookupflags & INPLOOKUP_RLOCKPCB) { 1812 INP_RLOCK(inp); 1813 if (in_pcbrele_rlocked(inp)) 1814 return (NULL); 1815 } else 1816 panic("%s: locking bug", __func__); 1817 } else 1818 INP_HASH_RUNLOCK(pcbinfo); 1819 return (inp); 1820 } 1821 1822 /* 1823 * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf 1824 * from which a pre-calculated hash value may be extracted. 1825 * 1826 * Possibly more of this logic should be in in_pcbgroup.c. 1827 */ 1828 struct inpcb * 1829 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport, 1830 struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp) 1831 { 1832 #if defined(PCBGROUP) 1833 struct inpcbgroup *pcbgroup; 1834 #endif 1835 1836 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0, 1837 ("%s: invalid lookup flags %d", __func__, lookupflags)); 1838 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0, 1839 ("%s: LOCKPCB not set", __func__)); 1840 1841 #if defined(PCBGROUP) 1842 if (in_pcbgroup_enabled(pcbinfo)) { 1843 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr, 1844 fport); 1845 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport, 1846 laddr, lport, lookupflags, ifp)); 1847 } 1848 #endif 1849 return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport, 1850 lookupflags, ifp)); 1851 } 1852 1853 struct inpcb * 1854 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr, 1855 u_int fport, struct in_addr laddr, u_int lport, int lookupflags, 1856 struct ifnet *ifp, struct mbuf *m) 1857 { 1858 #ifdef PCBGROUP 1859 struct inpcbgroup *pcbgroup; 1860 #endif 1861 1862 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0, 1863 ("%s: invalid lookup flags %d", __func__, lookupflags)); 1864 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0, 1865 ("%s: LOCKPCB not set", __func__)); 1866 1867 #ifdef PCBGROUP 1868 if (in_pcbgroup_enabled(pcbinfo)) { 1869 pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m), 1870 m->m_pkthdr.flowid); 1871 if (pcbgroup != NULL) 1872 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, 1873 fport, laddr, lport, lookupflags, ifp)); 1874 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr, 1875 fport); 1876 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport, 1877 laddr, lport, lookupflags, ifp)); 1878 } 1879 #endif 1880 return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport, 1881 lookupflags, ifp)); 1882 } 1883 #endif /* INET */ 1884 1885 /* 1886 * Insert PCB onto various hash lists. 1887 */ 1888 static int 1889 in_pcbinshash_internal(struct inpcb *inp, int do_pcbgroup_update) 1890 { 1891 struct inpcbhead *pcbhash; 1892 struct inpcbporthead *pcbporthash; 1893 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 1894 struct inpcbport *phd; 1895 u_int32_t hashkey_faddr; 1896 1897 INP_WLOCK_ASSERT(inp); 1898 INP_HASH_WLOCK_ASSERT(pcbinfo); 1899 1900 KASSERT((inp->inp_flags & INP_INHASHLIST) == 0, 1901 ("in_pcbinshash: INP_INHASHLIST")); 1902 1903 #ifdef INET6 1904 if (inp->inp_vflag & INP_IPV6) 1905 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */; 1906 else 1907 #endif 1908 hashkey_faddr = inp->inp_faddr.s_addr; 1909 1910 pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr, 1911 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)]; 1912 1913 pcbporthash = &pcbinfo->ipi_porthashbase[ 1914 INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)]; 1915 1916 /* 1917 * Go through port list and look for a head for this lport. 1918 */ 1919 LIST_FOREACH(phd, pcbporthash, phd_hash) { 1920 if (phd->phd_port == inp->inp_lport) 1921 break; 1922 } 1923 /* 1924 * If none exists, malloc one and tack it on. 1925 */ 1926 if (phd == NULL) { 1927 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT); 1928 if (phd == NULL) { 1929 return (ENOBUFS); /* XXX */ 1930 } 1931 phd->phd_port = inp->inp_lport; 1932 LIST_INIT(&phd->phd_pcblist); 1933 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash); 1934 } 1935 inp->inp_phd = phd; 1936 LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist); 1937 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 1938 inp->inp_flags |= INP_INHASHLIST; 1939 #ifdef PCBGROUP 1940 if (do_pcbgroup_update) 1941 in_pcbgroup_update(inp); 1942 #endif 1943 return (0); 1944 } 1945 1946 /* 1947 * For now, there are two public interfaces to insert an inpcb into the hash 1948 * lists -- one that does update pcbgroups, and one that doesn't. The latter 1949 * is used only in the TCP syncache, where in_pcbinshash is called before the 1950 * full 4-tuple is set for the inpcb, and we don't want to install in the 1951 * pcbgroup until later. 1952 * 1953 * XXXRW: This seems like a misfeature. in_pcbinshash should always update 1954 * connection groups, and partially initialised inpcbs should not be exposed 1955 * to either reservation hash tables or pcbgroups. 1956 */ 1957 int 1958 in_pcbinshash(struct inpcb *inp) 1959 { 1960 1961 return (in_pcbinshash_internal(inp, 1)); 1962 } 1963 1964 int 1965 in_pcbinshash_nopcbgroup(struct inpcb *inp) 1966 { 1967 1968 return (in_pcbinshash_internal(inp, 0)); 1969 } 1970 1971 /* 1972 * Move PCB to the proper hash bucket when { faddr, fport } have been 1973 * changed. NOTE: This does not handle the case of the lport changing (the 1974 * hashed port list would have to be updated as well), so the lport must 1975 * not change after in_pcbinshash() has been called. 1976 */ 1977 void 1978 in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m) 1979 { 1980 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 1981 struct inpcbhead *head; 1982 u_int32_t hashkey_faddr; 1983 1984 INP_WLOCK_ASSERT(inp); 1985 INP_HASH_WLOCK_ASSERT(pcbinfo); 1986 1987 KASSERT(inp->inp_flags & INP_INHASHLIST, 1988 ("in_pcbrehash: !INP_INHASHLIST")); 1989 1990 #ifdef INET6 1991 if (inp->inp_vflag & INP_IPV6) 1992 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */; 1993 else 1994 #endif 1995 hashkey_faddr = inp->inp_faddr.s_addr; 1996 1997 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr, 1998 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)]; 1999 2000 LIST_REMOVE(inp, inp_hash); 2001 LIST_INSERT_HEAD(head, inp, inp_hash); 2002 2003 #ifdef PCBGROUP 2004 if (m != NULL) 2005 in_pcbgroup_update_mbuf(inp, m); 2006 else 2007 in_pcbgroup_update(inp); 2008 #endif 2009 } 2010 2011 void 2012 in_pcbrehash(struct inpcb *inp) 2013 { 2014 2015 in_pcbrehash_mbuf(inp, NULL); 2016 } 2017 2018 /* 2019 * Remove PCB from various lists. 2020 */ 2021 static void 2022 in_pcbremlists(struct inpcb *inp) 2023 { 2024 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 2025 2026 INP_INFO_WLOCK_ASSERT(pcbinfo); 2027 INP_WLOCK_ASSERT(inp); 2028 2029 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 2030 if (inp->inp_flags & INP_INHASHLIST) { 2031 struct inpcbport *phd = inp->inp_phd; 2032 2033 INP_HASH_WLOCK(pcbinfo); 2034 LIST_REMOVE(inp, inp_hash); 2035 LIST_REMOVE(inp, inp_portlist); 2036 if (LIST_FIRST(&phd->phd_pcblist) == NULL) { 2037 LIST_REMOVE(phd, phd_hash); 2038 free(phd, M_PCB); 2039 } 2040 INP_HASH_WUNLOCK(pcbinfo); 2041 inp->inp_flags &= ~INP_INHASHLIST; 2042 } 2043 LIST_REMOVE(inp, inp_list); 2044 pcbinfo->ipi_count--; 2045 #ifdef PCBGROUP 2046 in_pcbgroup_remove(inp); 2047 #endif 2048 } 2049 2050 /* 2051 * A set label operation has occurred at the socket layer, propagate the 2052 * label change into the in_pcb for the socket. 2053 */ 2054 void 2055 in_pcbsosetlabel(struct socket *so) 2056 { 2057 #ifdef MAC 2058 struct inpcb *inp; 2059 2060 inp = sotoinpcb(so); 2061 KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL")); 2062 2063 INP_WLOCK(inp); 2064 SOCK_LOCK(so); 2065 mac_inpcb_sosetlabel(so, inp); 2066 SOCK_UNLOCK(so); 2067 INP_WUNLOCK(inp); 2068 #endif 2069 } 2070 2071 /* 2072 * ipport_tick runs once per second, determining if random port allocation 2073 * should be continued. If more than ipport_randomcps ports have been 2074 * allocated in the last second, then we return to sequential port 2075 * allocation. We return to random allocation only once we drop below 2076 * ipport_randomcps for at least ipport_randomtime seconds. 2077 */ 2078 static void 2079 ipport_tick(void *xtp) 2080 { 2081 VNET_ITERATOR_DECL(vnet_iter); 2082 2083 VNET_LIST_RLOCK_NOSLEEP(); 2084 VNET_FOREACH(vnet_iter) { 2085 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */ 2086 if (V_ipport_tcpallocs <= 2087 V_ipport_tcplastcount + V_ipport_randomcps) { 2088 if (V_ipport_stoprandom > 0) 2089 V_ipport_stoprandom--; 2090 } else 2091 V_ipport_stoprandom = V_ipport_randomtime; 2092 V_ipport_tcplastcount = V_ipport_tcpallocs; 2093 CURVNET_RESTORE(); 2094 } 2095 VNET_LIST_RUNLOCK_NOSLEEP(); 2096 callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL); 2097 } 2098 2099 static void 2100 ip_fini(void *xtp) 2101 { 2102 2103 callout_stop(&ipport_tick_callout); 2104 } 2105 2106 /* 2107 * The ipport_callout should start running at about the time we attach the 2108 * inet or inet6 domains. 2109 */ 2110 static void 2111 ipport_tick_init(const void *unused __unused) 2112 { 2113 2114 /* Start ipport_tick. */ 2115 callout_init(&ipport_tick_callout, CALLOUT_MPSAFE); 2116 callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL); 2117 EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL, 2118 SHUTDOWN_PRI_DEFAULT); 2119 } 2120 SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 2121 ipport_tick_init, NULL); 2122 2123 void 2124 inp_wlock(struct inpcb *inp) 2125 { 2126 2127 INP_WLOCK(inp); 2128 } 2129 2130 void 2131 inp_wunlock(struct inpcb *inp) 2132 { 2133 2134 INP_WUNLOCK(inp); 2135 } 2136 2137 void 2138 inp_rlock(struct inpcb *inp) 2139 { 2140 2141 INP_RLOCK(inp); 2142 } 2143 2144 void 2145 inp_runlock(struct inpcb *inp) 2146 { 2147 2148 INP_RUNLOCK(inp); 2149 } 2150 2151 #ifdef INVARIANTS 2152 void 2153 inp_lock_assert(struct inpcb *inp) 2154 { 2155 2156 INP_WLOCK_ASSERT(inp); 2157 } 2158 2159 void 2160 inp_unlock_assert(struct inpcb *inp) 2161 { 2162 2163 INP_UNLOCK_ASSERT(inp); 2164 } 2165 #endif 2166 2167 void 2168 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg) 2169 { 2170 struct inpcb *inp; 2171 2172 INP_INFO_RLOCK(&V_tcbinfo); 2173 LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) { 2174 INP_WLOCK(inp); 2175 func(inp, arg); 2176 INP_WUNLOCK(inp); 2177 } 2178 INP_INFO_RUNLOCK(&V_tcbinfo); 2179 } 2180 2181 struct socket * 2182 inp_inpcbtosocket(struct inpcb *inp) 2183 { 2184 2185 INP_WLOCK_ASSERT(inp); 2186 return (inp->inp_socket); 2187 } 2188 2189 struct tcpcb * 2190 inp_inpcbtotcpcb(struct inpcb *inp) 2191 { 2192 2193 INP_WLOCK_ASSERT(inp); 2194 return ((struct tcpcb *)inp->inp_ppcb); 2195 } 2196 2197 int 2198 inp_ip_tos_get(const struct inpcb *inp) 2199 { 2200 2201 return (inp->inp_ip_tos); 2202 } 2203 2204 void 2205 inp_ip_tos_set(struct inpcb *inp, int val) 2206 { 2207 2208 inp->inp_ip_tos = val; 2209 } 2210 2211 void 2212 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp, 2213 uint32_t *faddr, uint16_t *fp) 2214 { 2215 2216 INP_LOCK_ASSERT(inp); 2217 *laddr = inp->inp_laddr.s_addr; 2218 *faddr = inp->inp_faddr.s_addr; 2219 *lp = inp->inp_lport; 2220 *fp = inp->inp_fport; 2221 } 2222 2223 struct inpcb * 2224 so_sotoinpcb(struct socket *so) 2225 { 2226 2227 return (sotoinpcb(so)); 2228 } 2229 2230 struct tcpcb * 2231 so_sototcpcb(struct socket *so) 2232 { 2233 2234 return (sototcpcb(so)); 2235 } 2236 2237 #ifdef DDB 2238 static void 2239 db_print_indent(int indent) 2240 { 2241 int i; 2242 2243 for (i = 0; i < indent; i++) 2244 db_printf(" "); 2245 } 2246 2247 static void 2248 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent) 2249 { 2250 char faddr_str[48], laddr_str[48]; 2251 2252 db_print_indent(indent); 2253 db_printf("%s at %p\n", name, inc); 2254 2255 indent += 2; 2256 2257 #ifdef INET6 2258 if (inc->inc_flags & INC_ISIPV6) { 2259 /* IPv6. */ 2260 ip6_sprintf(laddr_str, &inc->inc6_laddr); 2261 ip6_sprintf(faddr_str, &inc->inc6_faddr); 2262 } else 2263 #endif 2264 { 2265 /* IPv4. */ 2266 inet_ntoa_r(inc->inc_laddr, laddr_str); 2267 inet_ntoa_r(inc->inc_faddr, faddr_str); 2268 } 2269 db_print_indent(indent); 2270 db_printf("inc_laddr %s inc_lport %u\n", laddr_str, 2271 ntohs(inc->inc_lport)); 2272 db_print_indent(indent); 2273 db_printf("inc_faddr %s inc_fport %u\n", faddr_str, 2274 ntohs(inc->inc_fport)); 2275 } 2276 2277 static void 2278 db_print_inpflags(int inp_flags) 2279 { 2280 int comma; 2281 2282 comma = 0; 2283 if (inp_flags & INP_RECVOPTS) { 2284 db_printf("%sINP_RECVOPTS", comma ? ", " : ""); 2285 comma = 1; 2286 } 2287 if (inp_flags & INP_RECVRETOPTS) { 2288 db_printf("%sINP_RECVRETOPTS", comma ? ", " : ""); 2289 comma = 1; 2290 } 2291 if (inp_flags & INP_RECVDSTADDR) { 2292 db_printf("%sINP_RECVDSTADDR", comma ? ", " : ""); 2293 comma = 1; 2294 } 2295 if (inp_flags & INP_HDRINCL) { 2296 db_printf("%sINP_HDRINCL", comma ? ", " : ""); 2297 comma = 1; 2298 } 2299 if (inp_flags & INP_HIGHPORT) { 2300 db_printf("%sINP_HIGHPORT", comma ? ", " : ""); 2301 comma = 1; 2302 } 2303 if (inp_flags & INP_LOWPORT) { 2304 db_printf("%sINP_LOWPORT", comma ? ", " : ""); 2305 comma = 1; 2306 } 2307 if (inp_flags & INP_ANONPORT) { 2308 db_printf("%sINP_ANONPORT", comma ? ", " : ""); 2309 comma = 1; 2310 } 2311 if (inp_flags & INP_RECVIF) { 2312 db_printf("%sINP_RECVIF", comma ? ", " : ""); 2313 comma = 1; 2314 } 2315 if (inp_flags & INP_MTUDISC) { 2316 db_printf("%sINP_MTUDISC", comma ? ", " : ""); 2317 comma = 1; 2318 } 2319 if (inp_flags & INP_FAITH) { 2320 db_printf("%sINP_FAITH", comma ? ", " : ""); 2321 comma = 1; 2322 } 2323 if (inp_flags & INP_RECVTTL) { 2324 db_printf("%sINP_RECVTTL", comma ? ", " : ""); 2325 comma = 1; 2326 } 2327 if (inp_flags & INP_DONTFRAG) { 2328 db_printf("%sINP_DONTFRAG", comma ? ", " : ""); 2329 comma = 1; 2330 } 2331 if (inp_flags & INP_RECVTOS) { 2332 db_printf("%sINP_RECVTOS", comma ? ", " : ""); 2333 comma = 1; 2334 } 2335 if (inp_flags & IN6P_IPV6_V6ONLY) { 2336 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : ""); 2337 comma = 1; 2338 } 2339 if (inp_flags & IN6P_PKTINFO) { 2340 db_printf("%sIN6P_PKTINFO", comma ? ", " : ""); 2341 comma = 1; 2342 } 2343 if (inp_flags & IN6P_HOPLIMIT) { 2344 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : ""); 2345 comma = 1; 2346 } 2347 if (inp_flags & IN6P_HOPOPTS) { 2348 db_printf("%sIN6P_HOPOPTS", comma ? ", " : ""); 2349 comma = 1; 2350 } 2351 if (inp_flags & IN6P_DSTOPTS) { 2352 db_printf("%sIN6P_DSTOPTS", comma ? ", " : ""); 2353 comma = 1; 2354 } 2355 if (inp_flags & IN6P_RTHDR) { 2356 db_printf("%sIN6P_RTHDR", comma ? ", " : ""); 2357 comma = 1; 2358 } 2359 if (inp_flags & IN6P_RTHDRDSTOPTS) { 2360 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : ""); 2361 comma = 1; 2362 } 2363 if (inp_flags & IN6P_TCLASS) { 2364 db_printf("%sIN6P_TCLASS", comma ? ", " : ""); 2365 comma = 1; 2366 } 2367 if (inp_flags & IN6P_AUTOFLOWLABEL) { 2368 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : ""); 2369 comma = 1; 2370 } 2371 if (inp_flags & INP_TIMEWAIT) { 2372 db_printf("%sINP_TIMEWAIT", comma ? ", " : ""); 2373 comma = 1; 2374 } 2375 if (inp_flags & INP_ONESBCAST) { 2376 db_printf("%sINP_ONESBCAST", comma ? ", " : ""); 2377 comma = 1; 2378 } 2379 if (inp_flags & INP_DROPPED) { 2380 db_printf("%sINP_DROPPED", comma ? ", " : ""); 2381 comma = 1; 2382 } 2383 if (inp_flags & INP_SOCKREF) { 2384 db_printf("%sINP_SOCKREF", comma ? ", " : ""); 2385 comma = 1; 2386 } 2387 if (inp_flags & IN6P_RFC2292) { 2388 db_printf("%sIN6P_RFC2292", comma ? ", " : ""); 2389 comma = 1; 2390 } 2391 if (inp_flags & IN6P_MTU) { 2392 db_printf("IN6P_MTU%s", comma ? ", " : ""); 2393 comma = 1; 2394 } 2395 } 2396 2397 static void 2398 db_print_inpvflag(u_char inp_vflag) 2399 { 2400 int comma; 2401 2402 comma = 0; 2403 if (inp_vflag & INP_IPV4) { 2404 db_printf("%sINP_IPV4", comma ? ", " : ""); 2405 comma = 1; 2406 } 2407 if (inp_vflag & INP_IPV6) { 2408 db_printf("%sINP_IPV6", comma ? ", " : ""); 2409 comma = 1; 2410 } 2411 if (inp_vflag & INP_IPV6PROTO) { 2412 db_printf("%sINP_IPV6PROTO", comma ? ", " : ""); 2413 comma = 1; 2414 } 2415 } 2416 2417 static void 2418 db_print_inpcb(struct inpcb *inp, const char *name, int indent) 2419 { 2420 2421 db_print_indent(indent); 2422 db_printf("%s at %p\n", name, inp); 2423 2424 indent += 2; 2425 2426 db_print_indent(indent); 2427 db_printf("inp_flow: 0x%x\n", inp->inp_flow); 2428 2429 db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent); 2430 2431 db_print_indent(indent); 2432 db_printf("inp_ppcb: %p inp_pcbinfo: %p inp_socket: %p\n", 2433 inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket); 2434 2435 db_print_indent(indent); 2436 db_printf("inp_label: %p inp_flags: 0x%x (", 2437 inp->inp_label, inp->inp_flags); 2438 db_print_inpflags(inp->inp_flags); 2439 db_printf(")\n"); 2440 2441 db_print_indent(indent); 2442 db_printf("inp_sp: %p inp_vflag: 0x%x (", inp->inp_sp, 2443 inp->inp_vflag); 2444 db_print_inpvflag(inp->inp_vflag); 2445 db_printf(")\n"); 2446 2447 db_print_indent(indent); 2448 db_printf("inp_ip_ttl: %d inp_ip_p: %d inp_ip_minttl: %d\n", 2449 inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl); 2450 2451 db_print_indent(indent); 2452 #ifdef INET6 2453 if (inp->inp_vflag & INP_IPV6) { 2454 db_printf("in6p_options: %p in6p_outputopts: %p " 2455 "in6p_moptions: %p\n", inp->in6p_options, 2456 inp->in6p_outputopts, inp->in6p_moptions); 2457 db_printf("in6p_icmp6filt: %p in6p_cksum %d " 2458 "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum, 2459 inp->in6p_hops); 2460 } else 2461 #endif 2462 { 2463 db_printf("inp_ip_tos: %d inp_ip_options: %p " 2464 "inp_ip_moptions: %p\n", inp->inp_ip_tos, 2465 inp->inp_options, inp->inp_moptions); 2466 } 2467 2468 db_print_indent(indent); 2469 db_printf("inp_phd: %p inp_gencnt: %ju\n", inp->inp_phd, 2470 (uintmax_t)inp->inp_gencnt); 2471 } 2472 2473 DB_SHOW_COMMAND(inpcb, db_show_inpcb) 2474 { 2475 struct inpcb *inp; 2476 2477 if (!have_addr) { 2478 db_printf("usage: show inpcb <addr>\n"); 2479 return; 2480 } 2481 inp = (struct inpcb *)addr; 2482 2483 db_print_inpcb(inp, "inpcb", 0); 2484 } 2485 #endif /* DDB */
Cache object: 2908b7a515c5459486e3032c71e468e2
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