1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1991, 1993, 1995 5 * The Regents of the University of California. 6 * Copyright (c) 2007-2009 Robert N. M. Watson 7 * Copyright (c) 2010-2011 Juniper Networks, Inc. 8 * All rights reserved. 9 * 10 * Portions of this software were developed by Robert N. M. Watson under 11 * contract to Juniper Networks, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)in_pcb.c 8.4 (Berkeley) 5/24/95 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "opt_ddb.h" 44 #include "opt_ipsec.h" 45 #include "opt_inet.h" 46 #include "opt_inet6.h" 47 #include "opt_ratelimit.h" 48 #include "opt_pcbgroup.h" 49 #include "opt_rss.h" 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/lock.h> 54 #include <sys/malloc.h> 55 #include <sys/mbuf.h> 56 #include <sys/callout.h> 57 #include <sys/eventhandler.h> 58 #include <sys/domain.h> 59 #include <sys/protosw.h> 60 #include <sys/rmlock.h> 61 #include <sys/smp.h> 62 #include <sys/socket.h> 63 #include <sys/socketvar.h> 64 #include <sys/sockio.h> 65 #include <sys/priv.h> 66 #include <sys/proc.h> 67 #include <sys/refcount.h> 68 #include <sys/jail.h> 69 #include <sys/kernel.h> 70 #include <sys/sysctl.h> 71 72 #ifdef DDB 73 #include <ddb/ddb.h> 74 #endif 75 76 #include <vm/uma.h> 77 78 #include <net/if.h> 79 #include <net/if_var.h> 80 #include <net/if_types.h> 81 #include <net/if_llatbl.h> 82 #include <net/route.h> 83 #include <net/rss_config.h> 84 #include <net/vnet.h> 85 86 #if defined(INET) || defined(INET6) 87 #include <netinet/in.h> 88 #include <netinet/in_pcb.h> 89 #ifdef INET 90 #include <netinet/in_var.h> 91 #include <netinet/in_fib.h> 92 #endif 93 #include <netinet/ip_var.h> 94 #include <netinet/tcp_var.h> 95 #ifdef TCPHPTS 96 #include <netinet/tcp_hpts.h> 97 #endif 98 #include <netinet/udp.h> 99 #include <netinet/udp_var.h> 100 #ifdef INET6 101 #include <netinet/ip6.h> 102 #include <netinet6/in6_pcb.h> 103 #include <netinet6/in6_var.h> 104 #include <netinet6/ip6_var.h> 105 #endif /* INET6 */ 106 #include <net/route/nhop.h> 107 #endif 108 109 #include <netipsec/ipsec_support.h> 110 111 #include <security/mac/mac_framework.h> 112 113 #define INPCBLBGROUP_SIZMIN 8 114 #define INPCBLBGROUP_SIZMAX 256 115 116 static struct callout ipport_tick_callout; 117 118 /* 119 * These configure the range of local port addresses assigned to 120 * "unspecified" outgoing connections/packets/whatever. 121 */ 122 VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1; /* 1023 */ 123 VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART; /* 600 */ 124 VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST; /* 10000 */ 125 VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST; /* 65535 */ 126 VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO; /* 49152 */ 127 VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO; /* 65535 */ 128 129 /* 130 * Reserved ports accessible only to root. There are significant 131 * security considerations that must be accounted for when changing these, 132 * but the security benefits can be great. Please be careful. 133 */ 134 VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1; /* 1023 */ 135 VNET_DEFINE(int, ipport_reservedlow); 136 137 /* Variables dealing with random ephemeral port allocation. */ 138 VNET_DEFINE(int, ipport_randomized) = 1; /* user controlled via sysctl */ 139 VNET_DEFINE(int, ipport_randomcps) = 10; /* user controlled via sysctl */ 140 VNET_DEFINE(int, ipport_randomtime) = 45; /* user controlled via sysctl */ 141 VNET_DEFINE(int, ipport_stoprandom); /* toggled by ipport_tick */ 142 VNET_DEFINE(int, ipport_tcpallocs); 143 VNET_DEFINE_STATIC(int, ipport_tcplastcount); 144 145 #define V_ipport_tcplastcount VNET(ipport_tcplastcount) 146 147 static void in_pcbremlists(struct inpcb *inp); 148 #ifdef INET 149 static struct inpcb *in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, 150 struct in_addr faddr, u_int fport_arg, 151 struct in_addr laddr, u_int lport_arg, 152 int lookupflags, struct ifnet *ifp); 153 154 #define RANGECHK(var, min, max) \ 155 if ((var) < (min)) { (var) = (min); } \ 156 else if ((var) > (max)) { (var) = (max); } 157 158 static int 159 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS) 160 { 161 int error; 162 163 error = sysctl_handle_int(oidp, arg1, arg2, req); 164 if (error == 0) { 165 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1); 166 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1); 167 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX); 168 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX); 169 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX); 170 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX); 171 } 172 return (error); 173 } 174 175 #undef RANGECHK 176 177 static SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, 178 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 179 "IP Ports"); 180 181 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, 182 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 183 &VNET_NAME(ipport_lowfirstauto), 0, &sysctl_net_ipport_check, "I", 184 ""); 185 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, 186 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 187 &VNET_NAME(ipport_lowlastauto), 0, &sysctl_net_ipport_check, "I", 188 ""); 189 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, 190 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 191 &VNET_NAME(ipport_firstauto), 0, &sysctl_net_ipport_check, "I", 192 ""); 193 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, 194 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 195 &VNET_NAME(ipport_lastauto), 0, &sysctl_net_ipport_check, "I", 196 ""); 197 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, 198 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 199 &VNET_NAME(ipport_hifirstauto), 0, &sysctl_net_ipport_check, "I", 200 ""); 201 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, 202 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 203 &VNET_NAME(ipport_hilastauto), 0, &sysctl_net_ipport_check, "I", 204 ""); 205 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh, 206 CTLFLAG_VNET | CTLFLAG_RW | CTLFLAG_SECURE, 207 &VNET_NAME(ipport_reservedhigh), 0, ""); 208 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow, 209 CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, ""); 210 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomized, 211 CTLFLAG_VNET | CTLFLAG_RW, 212 &VNET_NAME(ipport_randomized), 0, "Enable random port allocation"); 213 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, 214 CTLFLAG_VNET | CTLFLAG_RW, 215 &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port " 216 "allocations before switching to a sequental one"); 217 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, 218 CTLFLAG_VNET | CTLFLAG_RW, 219 &VNET_NAME(ipport_randomtime), 0, 220 "Minimum time to keep sequental port " 221 "allocation before switching to a random one"); 222 223 #ifdef RATELIMIT 224 counter_u64_t rate_limit_active; 225 counter_u64_t rate_limit_alloc_fail; 226 counter_u64_t rate_limit_set_ok; 227 228 static SYSCTL_NODE(_net_inet_ip, OID_AUTO, rl, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 229 "IP Rate Limiting"); 230 SYSCTL_COUNTER_U64(_net_inet_ip_rl, OID_AUTO, active, CTLFLAG_RD, 231 &rate_limit_active, "Active rate limited connections"); 232 SYSCTL_COUNTER_U64(_net_inet_ip_rl, OID_AUTO, alloc_fail, CTLFLAG_RD, 233 &rate_limit_alloc_fail, "Rate limited connection failures"); 234 SYSCTL_COUNTER_U64(_net_inet_ip_rl, OID_AUTO, set_ok, CTLFLAG_RD, 235 &rate_limit_set_ok, "Rate limited setting succeeded"); 236 #endif /* RATELIMIT */ 237 238 #endif /* INET */ 239 240 /* 241 * in_pcb.c: manage the Protocol Control Blocks. 242 * 243 * NOTE: It is assumed that most of these functions will be called with 244 * the pcbinfo lock held, and often, the inpcb lock held, as these utility 245 * functions often modify hash chains or addresses in pcbs. 246 */ 247 248 static struct inpcblbgroup * 249 in_pcblbgroup_alloc(struct inpcblbgrouphead *hdr, u_char vflag, 250 uint16_t port, const union in_dependaddr *addr, int size) 251 { 252 struct inpcblbgroup *grp; 253 size_t bytes; 254 255 bytes = __offsetof(struct inpcblbgroup, il_inp[size]); 256 grp = malloc(bytes, M_PCB, M_ZERO | M_NOWAIT); 257 if (!grp) 258 return (NULL); 259 grp->il_vflag = vflag; 260 grp->il_lport = port; 261 grp->il_dependladdr = *addr; 262 grp->il_inpsiz = size; 263 CK_LIST_INSERT_HEAD(hdr, grp, il_list); 264 return (grp); 265 } 266 267 static void 268 in_pcblbgroup_free_deferred(epoch_context_t ctx) 269 { 270 struct inpcblbgroup *grp; 271 272 grp = __containerof(ctx, struct inpcblbgroup, il_epoch_ctx); 273 free(grp, M_PCB); 274 } 275 276 static void 277 in_pcblbgroup_free(struct inpcblbgroup *grp) 278 { 279 280 CK_LIST_REMOVE(grp, il_list); 281 NET_EPOCH_CALL(in_pcblbgroup_free_deferred, &grp->il_epoch_ctx); 282 } 283 284 static struct inpcblbgroup * 285 in_pcblbgroup_resize(struct inpcblbgrouphead *hdr, 286 struct inpcblbgroup *old_grp, int size) 287 { 288 struct inpcblbgroup *grp; 289 int i; 290 291 grp = in_pcblbgroup_alloc(hdr, old_grp->il_vflag, 292 old_grp->il_lport, &old_grp->il_dependladdr, size); 293 if (grp == NULL) 294 return (NULL); 295 296 KASSERT(old_grp->il_inpcnt < grp->il_inpsiz, 297 ("invalid new local group size %d and old local group count %d", 298 grp->il_inpsiz, old_grp->il_inpcnt)); 299 300 for (i = 0; i < old_grp->il_inpcnt; ++i) 301 grp->il_inp[i] = old_grp->il_inp[i]; 302 grp->il_inpcnt = old_grp->il_inpcnt; 303 in_pcblbgroup_free(old_grp); 304 return (grp); 305 } 306 307 /* 308 * PCB at index 'i' is removed from the group. Pull up the ones below il_inp[i] 309 * and shrink group if possible. 310 */ 311 static void 312 in_pcblbgroup_reorder(struct inpcblbgrouphead *hdr, struct inpcblbgroup **grpp, 313 int i) 314 { 315 struct inpcblbgroup *grp, *new_grp; 316 317 grp = *grpp; 318 for (; i + 1 < grp->il_inpcnt; ++i) 319 grp->il_inp[i] = grp->il_inp[i + 1]; 320 grp->il_inpcnt--; 321 322 if (grp->il_inpsiz > INPCBLBGROUP_SIZMIN && 323 grp->il_inpcnt <= grp->il_inpsiz / 4) { 324 /* Shrink this group. */ 325 new_grp = in_pcblbgroup_resize(hdr, grp, grp->il_inpsiz / 2); 326 if (new_grp != NULL) 327 *grpp = new_grp; 328 } 329 } 330 331 /* 332 * Add PCB to load balance group for SO_REUSEPORT_LB option. 333 */ 334 static int 335 in_pcbinslbgrouphash(struct inpcb *inp) 336 { 337 const static struct timeval interval = { 60, 0 }; 338 static struct timeval lastprint; 339 struct inpcbinfo *pcbinfo; 340 struct inpcblbgrouphead *hdr; 341 struct inpcblbgroup *grp; 342 uint32_t idx; 343 344 pcbinfo = inp->inp_pcbinfo; 345 346 INP_WLOCK_ASSERT(inp); 347 INP_HASH_WLOCK_ASSERT(pcbinfo); 348 349 /* 350 * Don't allow jailed socket to join local group. 351 */ 352 if (inp->inp_socket != NULL && jailed(inp->inp_socket->so_cred)) 353 return (0); 354 355 #ifdef INET6 356 /* 357 * Don't allow IPv4 mapped INET6 wild socket. 358 */ 359 if ((inp->inp_vflag & INP_IPV4) && 360 inp->inp_laddr.s_addr == INADDR_ANY && 361 INP_CHECK_SOCKAF(inp->inp_socket, AF_INET6)) { 362 return (0); 363 } 364 #endif 365 366 idx = INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_lbgrouphashmask); 367 hdr = &pcbinfo->ipi_lbgrouphashbase[idx]; 368 CK_LIST_FOREACH(grp, hdr, il_list) { 369 if (grp->il_vflag == inp->inp_vflag && 370 grp->il_lport == inp->inp_lport && 371 memcmp(&grp->il_dependladdr, 372 &inp->inp_inc.inc_ie.ie_dependladdr, 373 sizeof(grp->il_dependladdr)) == 0) 374 break; 375 } 376 if (grp == NULL) { 377 /* Create new load balance group. */ 378 grp = in_pcblbgroup_alloc(hdr, inp->inp_vflag, 379 inp->inp_lport, &inp->inp_inc.inc_ie.ie_dependladdr, 380 INPCBLBGROUP_SIZMIN); 381 if (grp == NULL) 382 return (ENOBUFS); 383 } else if (grp->il_inpcnt == grp->il_inpsiz) { 384 if (grp->il_inpsiz >= INPCBLBGROUP_SIZMAX) { 385 if (ratecheck(&lastprint, &interval)) 386 printf("lb group port %d, limit reached\n", 387 ntohs(grp->il_lport)); 388 return (0); 389 } 390 391 /* Expand this local group. */ 392 grp = in_pcblbgroup_resize(hdr, grp, grp->il_inpsiz * 2); 393 if (grp == NULL) 394 return (ENOBUFS); 395 } 396 397 KASSERT(grp->il_inpcnt < grp->il_inpsiz, 398 ("invalid local group size %d and count %d", grp->il_inpsiz, 399 grp->il_inpcnt)); 400 401 grp->il_inp[grp->il_inpcnt] = inp; 402 grp->il_inpcnt++; 403 return (0); 404 } 405 406 /* 407 * Remove PCB from load balance group. 408 */ 409 static void 410 in_pcbremlbgrouphash(struct inpcb *inp) 411 { 412 struct inpcbinfo *pcbinfo; 413 struct inpcblbgrouphead *hdr; 414 struct inpcblbgroup *grp; 415 int i; 416 417 pcbinfo = inp->inp_pcbinfo; 418 419 INP_WLOCK_ASSERT(inp); 420 INP_HASH_WLOCK_ASSERT(pcbinfo); 421 422 hdr = &pcbinfo->ipi_lbgrouphashbase[ 423 INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_lbgrouphashmask)]; 424 CK_LIST_FOREACH(grp, hdr, il_list) { 425 for (i = 0; i < grp->il_inpcnt; ++i) { 426 if (grp->il_inp[i] != inp) 427 continue; 428 429 if (grp->il_inpcnt == 1) { 430 /* We are the last, free this local group. */ 431 in_pcblbgroup_free(grp); 432 } else { 433 /* Pull up inpcbs, shrink group if possible. */ 434 in_pcblbgroup_reorder(hdr, &grp, i); 435 } 436 return; 437 } 438 } 439 } 440 441 /* 442 * Different protocols initialize their inpcbs differently - giving 443 * different name to the lock. But they all are disposed the same. 444 */ 445 static void 446 inpcb_fini(void *mem, int size) 447 { 448 struct inpcb *inp = mem; 449 450 INP_LOCK_DESTROY(inp); 451 } 452 453 /* 454 * Initialize an inpcbinfo -- we should be able to reduce the number of 455 * arguments in time. 456 */ 457 void 458 in_pcbinfo_init(struct inpcbinfo *pcbinfo, const char *name, 459 struct inpcbhead *listhead, int hash_nelements, int porthash_nelements, 460 char *inpcbzone_name, uma_init inpcbzone_init, u_int hashfields) 461 { 462 463 porthash_nelements = imin(porthash_nelements, IPPORT_MAX + 1); 464 465 INP_INFO_LOCK_INIT(pcbinfo, name); 466 INP_HASH_LOCK_INIT(pcbinfo, "pcbinfohash"); /* XXXRW: argument? */ 467 INP_LIST_LOCK_INIT(pcbinfo, "pcbinfolist"); 468 #ifdef VIMAGE 469 pcbinfo->ipi_vnet = curvnet; 470 #endif 471 pcbinfo->ipi_listhead = listhead; 472 CK_LIST_INIT(pcbinfo->ipi_listhead); 473 pcbinfo->ipi_count = 0; 474 pcbinfo->ipi_hashbase = hashinit(hash_nelements, M_PCB, 475 &pcbinfo->ipi_hashmask); 476 pcbinfo->ipi_porthashbase = hashinit(porthash_nelements, M_PCB, 477 &pcbinfo->ipi_porthashmask); 478 pcbinfo->ipi_lbgrouphashbase = hashinit(porthash_nelements, M_PCB, 479 &pcbinfo->ipi_lbgrouphashmask); 480 #ifdef PCBGROUP 481 in_pcbgroup_init(pcbinfo, hashfields, hash_nelements); 482 #endif 483 pcbinfo->ipi_zone = uma_zcreate(inpcbzone_name, sizeof(struct inpcb), 484 NULL, NULL, inpcbzone_init, inpcb_fini, UMA_ALIGN_PTR, 0); 485 uma_zone_set_max(pcbinfo->ipi_zone, maxsockets); 486 uma_zone_set_warning(pcbinfo->ipi_zone, 487 "kern.ipc.maxsockets limit reached"); 488 } 489 490 /* 491 * Destroy an inpcbinfo. 492 */ 493 void 494 in_pcbinfo_destroy(struct inpcbinfo *pcbinfo) 495 { 496 497 KASSERT(pcbinfo->ipi_count == 0, 498 ("%s: ipi_count = %u", __func__, pcbinfo->ipi_count)); 499 500 hashdestroy(pcbinfo->ipi_hashbase, M_PCB, pcbinfo->ipi_hashmask); 501 hashdestroy(pcbinfo->ipi_porthashbase, M_PCB, 502 pcbinfo->ipi_porthashmask); 503 hashdestroy(pcbinfo->ipi_lbgrouphashbase, M_PCB, 504 pcbinfo->ipi_lbgrouphashmask); 505 #ifdef PCBGROUP 506 in_pcbgroup_destroy(pcbinfo); 507 #endif 508 uma_zdestroy(pcbinfo->ipi_zone); 509 INP_LIST_LOCK_DESTROY(pcbinfo); 510 INP_HASH_LOCK_DESTROY(pcbinfo); 511 INP_INFO_LOCK_DESTROY(pcbinfo); 512 } 513 514 /* 515 * Allocate a PCB and associate it with the socket. 516 * On success return with the PCB locked. 517 */ 518 int 519 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo) 520 { 521 struct inpcb *inp; 522 int error; 523 524 error = 0; 525 inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT); 526 if (inp == NULL) 527 return (ENOBUFS); 528 bzero(&inp->inp_start_zero, inp_zero_size); 529 #ifdef NUMA 530 inp->inp_numa_domain = M_NODOM; 531 #endif 532 inp->inp_pcbinfo = pcbinfo; 533 inp->inp_socket = so; 534 inp->inp_cred = crhold(so->so_cred); 535 inp->inp_inc.inc_fibnum = so->so_fibnum; 536 #ifdef MAC 537 error = mac_inpcb_init(inp, M_NOWAIT); 538 if (error != 0) 539 goto out; 540 mac_inpcb_create(so, inp); 541 #endif 542 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 543 error = ipsec_init_pcbpolicy(inp); 544 if (error != 0) { 545 #ifdef MAC 546 mac_inpcb_destroy(inp); 547 #endif 548 goto out; 549 } 550 #endif /*IPSEC*/ 551 #ifdef INET6 552 if (INP_SOCKAF(so) == AF_INET6) { 553 inp->inp_vflag |= INP_IPV6PROTO; 554 if (V_ip6_v6only) 555 inp->inp_flags |= IN6P_IPV6_V6ONLY; 556 } 557 #endif 558 INP_WLOCK(inp); 559 INP_LIST_WLOCK(pcbinfo); 560 CK_LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list); 561 pcbinfo->ipi_count++; 562 so->so_pcb = (caddr_t)inp; 563 #ifdef INET6 564 if (V_ip6_auto_flowlabel) 565 inp->inp_flags |= IN6P_AUTOFLOWLABEL; 566 #endif 567 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 568 refcount_init(&inp->inp_refcount, 1); /* Reference from inpcbinfo */ 569 570 /* 571 * Routes in inpcb's can cache L2 as well; they are guaranteed 572 * to be cleaned up. 573 */ 574 inp->inp_route.ro_flags = RT_LLE_CACHE; 575 INP_LIST_WUNLOCK(pcbinfo); 576 #if defined(IPSEC) || defined(IPSEC_SUPPORT) || defined(MAC) 577 out: 578 if (error != 0) { 579 crfree(inp->inp_cred); 580 uma_zfree(pcbinfo->ipi_zone, inp); 581 } 582 #endif 583 return (error); 584 } 585 586 #ifdef INET 587 int 588 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred) 589 { 590 int anonport, error; 591 592 INP_WLOCK_ASSERT(inp); 593 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 594 595 if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY) 596 return (EINVAL); 597 anonport = nam == NULL || ((struct sockaddr_in *)nam)->sin_port == 0; 598 error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr, 599 &inp->inp_lport, cred); 600 if (error) 601 return (error); 602 if (in_pcbinshash(inp) != 0) { 603 inp->inp_laddr.s_addr = INADDR_ANY; 604 inp->inp_lport = 0; 605 return (EAGAIN); 606 } 607 if (anonport) 608 inp->inp_flags |= INP_ANONPORT; 609 return (0); 610 } 611 #endif 612 613 #if defined(INET) || defined(INET6) 614 /* 615 * Assign a local port like in_pcb_lport(), but also used with connect() 616 * and a foreign address and port. If fsa is non-NULL, choose a local port 617 * that is unused with those, otherwise one that is completely unused. 618 * lsa can be NULL for IPv6. 619 */ 620 int 621 in_pcb_lport_dest(struct inpcb *inp, struct sockaddr *lsa, u_short *lportp, 622 struct sockaddr *fsa, u_short fport, struct ucred *cred, int lookupflags) 623 { 624 struct inpcbinfo *pcbinfo; 625 struct inpcb *tmpinp; 626 unsigned short *lastport; 627 int count, dorandom, error; 628 u_short aux, first, last, lport; 629 #ifdef INET 630 struct in_addr laddr, faddr; 631 #endif 632 #ifdef INET6 633 struct in6_addr *laddr6, *faddr6; 634 #endif 635 636 pcbinfo = inp->inp_pcbinfo; 637 638 /* 639 * Because no actual state changes occur here, a global write lock on 640 * the pcbinfo isn't required. 641 */ 642 INP_LOCK_ASSERT(inp); 643 INP_HASH_LOCK_ASSERT(pcbinfo); 644 645 if (inp->inp_flags & INP_HIGHPORT) { 646 first = V_ipport_hifirstauto; /* sysctl */ 647 last = V_ipport_hilastauto; 648 lastport = &pcbinfo->ipi_lasthi; 649 } else if (inp->inp_flags & INP_LOWPORT) { 650 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT); 651 if (error) 652 return (error); 653 first = V_ipport_lowfirstauto; /* 1023 */ 654 last = V_ipport_lowlastauto; /* 600 */ 655 lastport = &pcbinfo->ipi_lastlow; 656 } else { 657 first = V_ipport_firstauto; /* sysctl */ 658 last = V_ipport_lastauto; 659 lastport = &pcbinfo->ipi_lastport; 660 } 661 /* 662 * For UDP(-Lite), use random port allocation as long as the user 663 * allows it. For TCP (and as of yet unknown) connections, 664 * use random port allocation only if the user allows it AND 665 * ipport_tick() allows it. 666 */ 667 if (V_ipport_randomized && 668 (!V_ipport_stoprandom || pcbinfo == &V_udbinfo || 669 pcbinfo == &V_ulitecbinfo)) 670 dorandom = 1; 671 else 672 dorandom = 0; 673 /* 674 * It makes no sense to do random port allocation if 675 * we have the only port available. 676 */ 677 if (first == last) 678 dorandom = 0; 679 /* Make sure to not include UDP(-Lite) packets in the count. */ 680 if (pcbinfo != &V_udbinfo || pcbinfo != &V_ulitecbinfo) 681 V_ipport_tcpallocs++; 682 /* 683 * Instead of having two loops further down counting up or down 684 * make sure that first is always <= last and go with only one 685 * code path implementing all logic. 686 */ 687 if (first > last) { 688 aux = first; 689 first = last; 690 last = aux; 691 } 692 693 #ifdef INET 694 laddr.s_addr = INADDR_ANY; 695 if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) { 696 if (lsa != NULL) 697 laddr = ((struct sockaddr_in *)lsa)->sin_addr; 698 if (fsa != NULL) 699 faddr = ((struct sockaddr_in *)fsa)->sin_addr; 700 } 701 #endif 702 #ifdef INET6 703 laddr6 = NULL; 704 if ((inp->inp_vflag & INP_IPV6) != 0) { 705 if (lsa != NULL) 706 laddr6 = &((struct sockaddr_in6 *)lsa)->sin6_addr; 707 if (fsa != NULL) 708 faddr6 = &((struct sockaddr_in6 *)fsa)->sin6_addr; 709 } 710 #endif 711 712 tmpinp = NULL; 713 lport = *lportp; 714 715 if (dorandom) 716 *lastport = first + (arc4random() % (last - first)); 717 718 count = last - first; 719 720 do { 721 if (count-- < 0) /* completely used? */ 722 return (EADDRNOTAVAIL); 723 ++*lastport; 724 if (*lastport < first || *lastport > last) 725 *lastport = first; 726 lport = htons(*lastport); 727 728 if (fsa != NULL) { 729 #ifdef INET 730 if (lsa->sa_family == AF_INET) { 731 tmpinp = in_pcblookup_hash_locked(pcbinfo, 732 faddr, fport, laddr, lport, lookupflags, 733 NULL); 734 } 735 #endif 736 #ifdef INET6 737 if (lsa->sa_family == AF_INET6) { 738 tmpinp = in6_pcblookup_hash_locked(pcbinfo, 739 faddr6, fport, laddr6, lport, lookupflags, 740 NULL); 741 } 742 #endif 743 } else { 744 #ifdef INET6 745 if ((inp->inp_vflag & INP_IPV6) != 0) 746 tmpinp = in6_pcblookup_local(pcbinfo, 747 &inp->in6p_laddr, lport, lookupflags, cred); 748 #endif 749 #if defined(INET) && defined(INET6) 750 else 751 #endif 752 #ifdef INET 753 tmpinp = in_pcblookup_local(pcbinfo, laddr, 754 lport, lookupflags, cred); 755 #endif 756 } 757 } while (tmpinp != NULL); 758 759 *lportp = lport; 760 761 return (0); 762 } 763 764 /* 765 * Select a local port (number) to use. 766 */ 767 int 768 in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp, 769 struct ucred *cred, int lookupflags) 770 { 771 struct sockaddr_in laddr; 772 773 if (laddrp) { 774 bzero(&laddr, sizeof(laddr)); 775 laddr.sin_family = AF_INET; 776 laddr.sin_addr = *laddrp; 777 } 778 return (in_pcb_lport_dest(inp, laddrp ? (struct sockaddr *) &laddr : 779 NULL, lportp, NULL, 0, cred, lookupflags)); 780 } 781 782 /* 783 * Return cached socket options. 784 */ 785 int 786 inp_so_options(const struct inpcb *inp) 787 { 788 int so_options; 789 790 so_options = 0; 791 792 if ((inp->inp_flags2 & INP_REUSEPORT_LB) != 0) 793 so_options |= SO_REUSEPORT_LB; 794 if ((inp->inp_flags2 & INP_REUSEPORT) != 0) 795 so_options |= SO_REUSEPORT; 796 if ((inp->inp_flags2 & INP_REUSEADDR) != 0) 797 so_options |= SO_REUSEADDR; 798 return (so_options); 799 } 800 #endif /* INET || INET6 */ 801 802 /* 803 * Check if a new BINDMULTI socket is allowed to be created. 804 * 805 * ni points to the new inp. 806 * oi points to the exisitng inp. 807 * 808 * This checks whether the existing inp also has BINDMULTI and 809 * whether the credentials match. 810 */ 811 int 812 in_pcbbind_check_bindmulti(const struct inpcb *ni, const struct inpcb *oi) 813 { 814 /* Check permissions match */ 815 if ((ni->inp_flags2 & INP_BINDMULTI) && 816 (ni->inp_cred->cr_uid != 817 oi->inp_cred->cr_uid)) 818 return (0); 819 820 /* Check the existing inp has BINDMULTI set */ 821 if ((ni->inp_flags2 & INP_BINDMULTI) && 822 ((oi->inp_flags2 & INP_BINDMULTI) == 0)) 823 return (0); 824 825 /* 826 * We're okay - either INP_BINDMULTI isn't set on ni, or 827 * it is and it matches the checks. 828 */ 829 return (1); 830 } 831 832 #ifdef INET 833 /* 834 * Set up a bind operation on a PCB, performing port allocation 835 * as required, but do not actually modify the PCB. Callers can 836 * either complete the bind by setting inp_laddr/inp_lport and 837 * calling in_pcbinshash(), or they can just use the resulting 838 * port and address to authorise the sending of a once-off packet. 839 * 840 * On error, the values of *laddrp and *lportp are not changed. 841 */ 842 int 843 in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp, 844 u_short *lportp, struct ucred *cred) 845 { 846 struct socket *so = inp->inp_socket; 847 struct sockaddr_in *sin; 848 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 849 struct in_addr laddr; 850 u_short lport = 0; 851 int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT); 852 int error; 853 854 /* 855 * XXX: Maybe we could let SO_REUSEPORT_LB set SO_REUSEPORT bit here 856 * so that we don't have to add to the (already messy) code below. 857 */ 858 int reuseport_lb = (so->so_options & SO_REUSEPORT_LB); 859 860 /* 861 * No state changes, so read locks are sufficient here. 862 */ 863 INP_LOCK_ASSERT(inp); 864 INP_HASH_LOCK_ASSERT(pcbinfo); 865 866 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */ 867 return (EADDRNOTAVAIL); 868 laddr.s_addr = *laddrp; 869 if (nam != NULL && laddr.s_addr != INADDR_ANY) 870 return (EINVAL); 871 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT|SO_REUSEPORT_LB)) == 0) 872 lookupflags = INPLOOKUP_WILDCARD; 873 if (nam == NULL) { 874 if ((error = prison_local_ip4(cred, &laddr)) != 0) 875 return (error); 876 } else { 877 sin = (struct sockaddr_in *)nam; 878 if (nam->sa_len != sizeof (*sin)) 879 return (EINVAL); 880 #ifdef notdef 881 /* 882 * We should check the family, but old programs 883 * incorrectly fail to initialize it. 884 */ 885 if (sin->sin_family != AF_INET) 886 return (EAFNOSUPPORT); 887 #endif 888 error = prison_local_ip4(cred, &sin->sin_addr); 889 if (error) 890 return (error); 891 if (sin->sin_port != *lportp) { 892 /* Don't allow the port to change. */ 893 if (*lportp != 0) 894 return (EINVAL); 895 lport = sin->sin_port; 896 } 897 /* NB: lport is left as 0 if the port isn't being changed. */ 898 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 899 /* 900 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 901 * allow complete duplication of binding if 902 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 903 * and a multicast address is bound on both 904 * new and duplicated sockets. 905 */ 906 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0) 907 reuseport = SO_REUSEADDR|SO_REUSEPORT; 908 /* 909 * XXX: How to deal with SO_REUSEPORT_LB here? 910 * Treat same as SO_REUSEPORT for now. 911 */ 912 if ((so->so_options & 913 (SO_REUSEADDR|SO_REUSEPORT_LB)) != 0) 914 reuseport_lb = SO_REUSEADDR|SO_REUSEPORT_LB; 915 } else if (sin->sin_addr.s_addr != INADDR_ANY) { 916 sin->sin_port = 0; /* yech... */ 917 bzero(&sin->sin_zero, sizeof(sin->sin_zero)); 918 /* 919 * Is the address a local IP address? 920 * If INP_BINDANY is set, then the socket may be bound 921 * to any endpoint address, local or not. 922 */ 923 if ((inp->inp_flags & INP_BINDANY) == 0 && 924 ifa_ifwithaddr_check((struct sockaddr *)sin) == 0) 925 return (EADDRNOTAVAIL); 926 } 927 laddr = sin->sin_addr; 928 if (lport) { 929 struct inpcb *t; 930 struct tcptw *tw; 931 932 /* GROSS */ 933 if (ntohs(lport) <= V_ipport_reservedhigh && 934 ntohs(lport) >= V_ipport_reservedlow && 935 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT)) 936 return (EACCES); 937 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) && 938 priv_check_cred(inp->inp_cred, PRIV_NETINET_REUSEPORT) != 0) { 939 t = in_pcblookup_local(pcbinfo, sin->sin_addr, 940 lport, INPLOOKUP_WILDCARD, cred); 941 /* 942 * XXX 943 * This entire block sorely needs a rewrite. 944 */ 945 if (t && 946 ((inp->inp_flags2 & INP_BINDMULTI) == 0) && 947 ((t->inp_flags & INP_TIMEWAIT) == 0) && 948 (so->so_type != SOCK_STREAM || 949 ntohl(t->inp_faddr.s_addr) == INADDR_ANY) && 950 (ntohl(sin->sin_addr.s_addr) != INADDR_ANY || 951 ntohl(t->inp_laddr.s_addr) != INADDR_ANY || 952 (t->inp_flags2 & INP_REUSEPORT) || 953 (t->inp_flags2 & INP_REUSEPORT_LB) == 0) && 954 (inp->inp_cred->cr_uid != 955 t->inp_cred->cr_uid)) 956 return (EADDRINUSE); 957 958 /* 959 * If the socket is a BINDMULTI socket, then 960 * the credentials need to match and the 961 * original socket also has to have been bound 962 * with BINDMULTI. 963 */ 964 if (t && (! in_pcbbind_check_bindmulti(inp, t))) 965 return (EADDRINUSE); 966 } 967 t = in_pcblookup_local(pcbinfo, sin->sin_addr, 968 lport, lookupflags, cred); 969 if (t && (t->inp_flags & INP_TIMEWAIT)) { 970 /* 971 * XXXRW: If an incpb has had its timewait 972 * state recycled, we treat the address as 973 * being in use (for now). This is better 974 * than a panic, but not desirable. 975 */ 976 tw = intotw(t); 977 if (tw == NULL || 978 ((reuseport & tw->tw_so_options) == 0 && 979 (reuseport_lb & 980 tw->tw_so_options) == 0)) { 981 return (EADDRINUSE); 982 } 983 } else if (t && 984 ((inp->inp_flags2 & INP_BINDMULTI) == 0) && 985 (reuseport & inp_so_options(t)) == 0 && 986 (reuseport_lb & inp_so_options(t)) == 0) { 987 #ifdef INET6 988 if (ntohl(sin->sin_addr.s_addr) != 989 INADDR_ANY || 990 ntohl(t->inp_laddr.s_addr) != 991 INADDR_ANY || 992 (inp->inp_vflag & INP_IPV6PROTO) == 0 || 993 (t->inp_vflag & INP_IPV6PROTO) == 0) 994 #endif 995 return (EADDRINUSE); 996 if (t && (! in_pcbbind_check_bindmulti(inp, t))) 997 return (EADDRINUSE); 998 } 999 } 1000 } 1001 if (*lportp != 0) 1002 lport = *lportp; 1003 if (lport == 0) { 1004 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags); 1005 if (error != 0) 1006 return (error); 1007 } 1008 *laddrp = laddr.s_addr; 1009 *lportp = lport; 1010 return (0); 1011 } 1012 1013 /* 1014 * Connect from a socket to a specified address. 1015 * Both address and port must be specified in argument sin. 1016 * If don't have a local address for this socket yet, 1017 * then pick one. 1018 */ 1019 int 1020 in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam, 1021 struct ucred *cred, struct mbuf *m, bool rehash) 1022 { 1023 u_short lport, fport; 1024 in_addr_t laddr, faddr; 1025 int anonport, error; 1026 1027 INP_WLOCK_ASSERT(inp); 1028 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 1029 1030 lport = inp->inp_lport; 1031 laddr = inp->inp_laddr.s_addr; 1032 anonport = (lport == 0); 1033 error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport, 1034 NULL, cred); 1035 if (error) 1036 return (error); 1037 1038 /* Do the initial binding of the local address if required. */ 1039 if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) { 1040 KASSERT(rehash == true, 1041 ("Rehashing required for unbound inps")); 1042 inp->inp_lport = lport; 1043 inp->inp_laddr.s_addr = laddr; 1044 if (in_pcbinshash(inp) != 0) { 1045 inp->inp_laddr.s_addr = INADDR_ANY; 1046 inp->inp_lport = 0; 1047 return (EAGAIN); 1048 } 1049 } 1050 1051 /* Commit the remaining changes. */ 1052 inp->inp_lport = lport; 1053 inp->inp_laddr.s_addr = laddr; 1054 inp->inp_faddr.s_addr = faddr; 1055 inp->inp_fport = fport; 1056 if (rehash) { 1057 in_pcbrehash_mbuf(inp, m); 1058 } else { 1059 in_pcbinshash_mbuf(inp, m); 1060 } 1061 1062 if (anonport) 1063 inp->inp_flags |= INP_ANONPORT; 1064 return (0); 1065 } 1066 1067 int 1068 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred) 1069 { 1070 1071 return (in_pcbconnect_mbuf(inp, nam, cred, NULL, true)); 1072 } 1073 1074 /* 1075 * Do proper source address selection on an unbound socket in case 1076 * of connect. Take jails into account as well. 1077 */ 1078 int 1079 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr, 1080 struct ucred *cred) 1081 { 1082 struct ifaddr *ifa; 1083 struct sockaddr *sa; 1084 struct sockaddr_in *sin, dst; 1085 struct nhop_object *nh; 1086 int error; 1087 1088 NET_EPOCH_ASSERT(); 1089 KASSERT(laddr != NULL, ("%s: laddr NULL", __func__)); 1090 /* 1091 * Bypass source address selection and use the primary jail IP 1092 * if requested. 1093 */ 1094 if (cred != NULL && !prison_saddrsel_ip4(cred, laddr)) 1095 return (0); 1096 1097 error = 0; 1098 1099 nh = NULL; 1100 bzero(&dst, sizeof(dst)); 1101 sin = &dst; 1102 sin->sin_family = AF_INET; 1103 sin->sin_len = sizeof(struct sockaddr_in); 1104 sin->sin_addr.s_addr = faddr->s_addr; 1105 1106 /* 1107 * If route is known our src addr is taken from the i/f, 1108 * else punt. 1109 * 1110 * Find out route to destination. 1111 */ 1112 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0) 1113 nh = fib4_lookup(inp->inp_inc.inc_fibnum, *faddr, 1114 0, NHR_NONE, 0); 1115 1116 /* 1117 * If we found a route, use the address corresponding to 1118 * the outgoing interface. 1119 * 1120 * Otherwise assume faddr is reachable on a directly connected 1121 * network and try to find a corresponding interface to take 1122 * the source address from. 1123 */ 1124 if (nh == NULL || nh->nh_ifp == NULL) { 1125 struct in_ifaddr *ia; 1126 struct ifnet *ifp; 1127 1128 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin, 1129 inp->inp_socket->so_fibnum)); 1130 if (ia == NULL) { 1131 ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0, 1132 inp->inp_socket->so_fibnum)); 1133 } 1134 if (ia == NULL) { 1135 error = ENETUNREACH; 1136 goto done; 1137 } 1138 1139 if (cred == NULL || !prison_flag(cred, PR_IP4)) { 1140 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1141 goto done; 1142 } 1143 1144 ifp = ia->ia_ifp; 1145 ia = NULL; 1146 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1147 sa = ifa->ifa_addr; 1148 if (sa->sa_family != AF_INET) 1149 continue; 1150 sin = (struct sockaddr_in *)sa; 1151 if (prison_check_ip4(cred, &sin->sin_addr) == 0) { 1152 ia = (struct in_ifaddr *)ifa; 1153 break; 1154 } 1155 } 1156 if (ia != NULL) { 1157 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1158 goto done; 1159 } 1160 1161 /* 3. As a last resort return the 'default' jail address. */ 1162 error = prison_get_ip4(cred, laddr); 1163 goto done; 1164 } 1165 1166 /* 1167 * If the outgoing interface on the route found is not 1168 * a loopback interface, use the address from that interface. 1169 * In case of jails do those three steps: 1170 * 1. check if the interface address belongs to the jail. If so use it. 1171 * 2. check if we have any address on the outgoing interface 1172 * belonging to this jail. If so use it. 1173 * 3. as a last resort return the 'default' jail address. 1174 */ 1175 if ((nh->nh_ifp->if_flags & IFF_LOOPBACK) == 0) { 1176 struct in_ifaddr *ia; 1177 struct ifnet *ifp; 1178 1179 /* If not jailed, use the default returned. */ 1180 if (cred == NULL || !prison_flag(cred, PR_IP4)) { 1181 ia = (struct in_ifaddr *)nh->nh_ifa; 1182 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1183 goto done; 1184 } 1185 1186 /* Jailed. */ 1187 /* 1. Check if the iface address belongs to the jail. */ 1188 sin = (struct sockaddr_in *)nh->nh_ifa->ifa_addr; 1189 if (prison_check_ip4(cred, &sin->sin_addr) == 0) { 1190 ia = (struct in_ifaddr *)nh->nh_ifa; 1191 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1192 goto done; 1193 } 1194 1195 /* 1196 * 2. Check if we have any address on the outgoing interface 1197 * belonging to this jail. 1198 */ 1199 ia = NULL; 1200 ifp = nh->nh_ifp; 1201 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1202 sa = ifa->ifa_addr; 1203 if (sa->sa_family != AF_INET) 1204 continue; 1205 sin = (struct sockaddr_in *)sa; 1206 if (prison_check_ip4(cred, &sin->sin_addr) == 0) { 1207 ia = (struct in_ifaddr *)ifa; 1208 break; 1209 } 1210 } 1211 if (ia != NULL) { 1212 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1213 goto done; 1214 } 1215 1216 /* 3. As a last resort return the 'default' jail address. */ 1217 error = prison_get_ip4(cred, laddr); 1218 goto done; 1219 } 1220 1221 /* 1222 * The outgoing interface is marked with 'loopback net', so a route 1223 * to ourselves is here. 1224 * Try to find the interface of the destination address and then 1225 * take the address from there. That interface is not necessarily 1226 * a loopback interface. 1227 * In case of jails, check that it is an address of the jail 1228 * and if we cannot find, fall back to the 'default' jail address. 1229 */ 1230 if ((nh->nh_ifp->if_flags & IFF_LOOPBACK) != 0) { 1231 struct in_ifaddr *ia; 1232 1233 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&dst), 1234 inp->inp_socket->so_fibnum)); 1235 if (ia == NULL) 1236 ia = ifatoia(ifa_ifwithnet(sintosa(&dst), 0, 1237 inp->inp_socket->so_fibnum)); 1238 if (ia == NULL) 1239 ia = ifatoia(ifa_ifwithaddr(sintosa(&dst))); 1240 1241 if (cred == NULL || !prison_flag(cred, PR_IP4)) { 1242 if (ia == NULL) { 1243 error = ENETUNREACH; 1244 goto done; 1245 } 1246 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1247 goto done; 1248 } 1249 1250 /* Jailed. */ 1251 if (ia != NULL) { 1252 struct ifnet *ifp; 1253 1254 ifp = ia->ia_ifp; 1255 ia = NULL; 1256 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1257 sa = ifa->ifa_addr; 1258 if (sa->sa_family != AF_INET) 1259 continue; 1260 sin = (struct sockaddr_in *)sa; 1261 if (prison_check_ip4(cred, 1262 &sin->sin_addr) == 0) { 1263 ia = (struct in_ifaddr *)ifa; 1264 break; 1265 } 1266 } 1267 if (ia != NULL) { 1268 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1269 goto done; 1270 } 1271 } 1272 1273 /* 3. As a last resort return the 'default' jail address. */ 1274 error = prison_get_ip4(cred, laddr); 1275 goto done; 1276 } 1277 1278 done: 1279 return (error); 1280 } 1281 1282 /* 1283 * Set up for a connect from a socket to the specified address. 1284 * On entry, *laddrp and *lportp should contain the current local 1285 * address and port for the PCB; these are updated to the values 1286 * that should be placed in inp_laddr and inp_lport to complete 1287 * the connect. 1288 * 1289 * On success, *faddrp and *fportp will be set to the remote address 1290 * and port. These are not updated in the error case. 1291 * 1292 * If the operation fails because the connection already exists, 1293 * *oinpp will be set to the PCB of that connection so that the 1294 * caller can decide to override it. In all other cases, *oinpp 1295 * is set to NULL. 1296 */ 1297 int 1298 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam, 1299 in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp, 1300 struct inpcb **oinpp, struct ucred *cred) 1301 { 1302 struct rm_priotracker in_ifa_tracker; 1303 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 1304 struct in_ifaddr *ia; 1305 struct inpcb *oinp; 1306 struct in_addr laddr, faddr; 1307 u_short lport, fport; 1308 int error; 1309 1310 /* 1311 * Because a global state change doesn't actually occur here, a read 1312 * lock is sufficient. 1313 */ 1314 NET_EPOCH_ASSERT(); 1315 INP_LOCK_ASSERT(inp); 1316 INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo); 1317 1318 if (oinpp != NULL) 1319 *oinpp = NULL; 1320 if (nam->sa_len != sizeof (*sin)) 1321 return (EINVAL); 1322 if (sin->sin_family != AF_INET) 1323 return (EAFNOSUPPORT); 1324 if (sin->sin_port == 0) 1325 return (EADDRNOTAVAIL); 1326 laddr.s_addr = *laddrp; 1327 lport = *lportp; 1328 faddr = sin->sin_addr; 1329 fport = sin->sin_port; 1330 1331 if (!CK_STAILQ_EMPTY(&V_in_ifaddrhead)) { 1332 /* 1333 * If the destination address is INADDR_ANY, 1334 * use the primary local address. 1335 * If the supplied address is INADDR_BROADCAST, 1336 * and the primary interface supports broadcast, 1337 * choose the broadcast address for that interface. 1338 */ 1339 if (faddr.s_addr == INADDR_ANY) { 1340 IN_IFADDR_RLOCK(&in_ifa_tracker); 1341 faddr = 1342 IA_SIN(CK_STAILQ_FIRST(&V_in_ifaddrhead))->sin_addr; 1343 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 1344 if (cred != NULL && 1345 (error = prison_get_ip4(cred, &faddr)) != 0) 1346 return (error); 1347 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) { 1348 IN_IFADDR_RLOCK(&in_ifa_tracker); 1349 if (CK_STAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags & 1350 IFF_BROADCAST) 1351 faddr = satosin(&CK_STAILQ_FIRST( 1352 &V_in_ifaddrhead)->ia_broadaddr)->sin_addr; 1353 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 1354 } 1355 } 1356 if (laddr.s_addr == INADDR_ANY) { 1357 error = in_pcbladdr(inp, &faddr, &laddr, cred); 1358 /* 1359 * If the destination address is multicast and an outgoing 1360 * interface has been set as a multicast option, prefer the 1361 * address of that interface as our source address. 1362 */ 1363 if (IN_MULTICAST(ntohl(faddr.s_addr)) && 1364 inp->inp_moptions != NULL) { 1365 struct ip_moptions *imo; 1366 struct ifnet *ifp; 1367 1368 imo = inp->inp_moptions; 1369 if (imo->imo_multicast_ifp != NULL) { 1370 ifp = imo->imo_multicast_ifp; 1371 IN_IFADDR_RLOCK(&in_ifa_tracker); 1372 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1373 if ((ia->ia_ifp == ifp) && 1374 (cred == NULL || 1375 prison_check_ip4(cred, 1376 &ia->ia_addr.sin_addr) == 0)) 1377 break; 1378 } 1379 if (ia == NULL) 1380 error = EADDRNOTAVAIL; 1381 else { 1382 laddr = ia->ia_addr.sin_addr; 1383 error = 0; 1384 } 1385 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 1386 } 1387 } 1388 if (error) 1389 return (error); 1390 } 1391 if (lport != 0) { 1392 oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, 1393 fport, laddr, lport, 0, NULL); 1394 if (oinp != NULL) { 1395 if (oinpp != NULL) 1396 *oinpp = oinp; 1397 return (EADDRINUSE); 1398 } 1399 } else { 1400 struct sockaddr_in lsin, fsin; 1401 1402 bzero(&lsin, sizeof(lsin)); 1403 bzero(&fsin, sizeof(fsin)); 1404 lsin.sin_family = AF_INET; 1405 lsin.sin_addr = laddr; 1406 fsin.sin_family = AF_INET; 1407 fsin.sin_addr = faddr; 1408 error = in_pcb_lport_dest(inp, (struct sockaddr *) &lsin, 1409 &lport, (struct sockaddr *)& fsin, fport, cred, 1410 INPLOOKUP_WILDCARD); 1411 if (error) 1412 return (error); 1413 } 1414 *laddrp = laddr.s_addr; 1415 *lportp = lport; 1416 *faddrp = faddr.s_addr; 1417 *fportp = fport; 1418 return (0); 1419 } 1420 1421 void 1422 in_pcbdisconnect(struct inpcb *inp) 1423 { 1424 1425 INP_WLOCK_ASSERT(inp); 1426 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 1427 1428 inp->inp_faddr.s_addr = INADDR_ANY; 1429 inp->inp_fport = 0; 1430 in_pcbrehash(inp); 1431 } 1432 #endif /* INET */ 1433 1434 /* 1435 * in_pcbdetach() is responsibe for disassociating a socket from an inpcb. 1436 * For most protocols, this will be invoked immediately prior to calling 1437 * in_pcbfree(). However, with TCP the inpcb may significantly outlive the 1438 * socket, in which case in_pcbfree() is deferred. 1439 */ 1440 void 1441 in_pcbdetach(struct inpcb *inp) 1442 { 1443 1444 KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__)); 1445 1446 #ifdef RATELIMIT 1447 if (inp->inp_snd_tag != NULL) 1448 in_pcbdetach_txrtlmt(inp); 1449 #endif 1450 inp->inp_socket->so_pcb = NULL; 1451 inp->inp_socket = NULL; 1452 } 1453 1454 /* 1455 * in_pcbref() bumps the reference count on an inpcb in order to maintain 1456 * stability of an inpcb pointer despite the inpcb lock being released. This 1457 * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded, 1458 * but where the inpcb lock may already held, or when acquiring a reference 1459 * via a pcbgroup. 1460 * 1461 * in_pcbref() should be used only to provide brief memory stability, and 1462 * must always be followed by a call to INP_WLOCK() and in_pcbrele() to 1463 * garbage collect the inpcb if it has been in_pcbfree()'d from another 1464 * context. Until in_pcbrele() has returned that the inpcb is still valid, 1465 * lock and rele are the *only* safe operations that may be performed on the 1466 * inpcb. 1467 * 1468 * While the inpcb will not be freed, releasing the inpcb lock means that the 1469 * connection's state may change, so the caller should be careful to 1470 * revalidate any cached state on reacquiring the lock. Drop the reference 1471 * using in_pcbrele(). 1472 */ 1473 void 1474 in_pcbref(struct inpcb *inp) 1475 { 1476 1477 KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__)); 1478 1479 refcount_acquire(&inp->inp_refcount); 1480 } 1481 1482 /* 1483 * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to 1484 * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we 1485 * return a flag indicating whether or not the inpcb remains valid. If it is 1486 * valid, we return with the inpcb lock held. 1487 * 1488 * Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a 1489 * reference on an inpcb. Historically more work was done here (actually, in 1490 * in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the 1491 * need for the pcbinfo lock in in_pcbrele(). Deferring the free is entirely 1492 * about memory stability (and continued use of the write lock). 1493 */ 1494 int 1495 in_pcbrele_rlocked(struct inpcb *inp) 1496 { 1497 struct inpcbinfo *pcbinfo; 1498 1499 KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__)); 1500 1501 INP_RLOCK_ASSERT(inp); 1502 1503 if (refcount_release(&inp->inp_refcount) == 0) { 1504 /* 1505 * If the inpcb has been freed, let the caller know, even if 1506 * this isn't the last reference. 1507 */ 1508 if (inp->inp_flags2 & INP_FREED) { 1509 INP_RUNLOCK(inp); 1510 return (1); 1511 } 1512 return (0); 1513 } 1514 1515 KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__)); 1516 #ifdef TCPHPTS 1517 if (inp->inp_in_hpts || inp->inp_in_input) { 1518 struct tcp_hpts_entry *hpts; 1519 /* 1520 * We should not be on the hpts at 1521 * this point in any form. we must 1522 * get the lock to be sure. 1523 */ 1524 hpts = tcp_hpts_lock(inp); 1525 if (inp->inp_in_hpts) 1526 panic("Hpts:%p inp:%p at free still on hpts", 1527 hpts, inp); 1528 mtx_unlock(&hpts->p_mtx); 1529 hpts = tcp_input_lock(inp); 1530 if (inp->inp_in_input) 1531 panic("Hpts:%p inp:%p at free still on input hpts", 1532 hpts, inp); 1533 mtx_unlock(&hpts->p_mtx); 1534 } 1535 #endif 1536 INP_RUNLOCK(inp); 1537 pcbinfo = inp->inp_pcbinfo; 1538 uma_zfree(pcbinfo->ipi_zone, inp); 1539 return (1); 1540 } 1541 1542 int 1543 in_pcbrele_wlocked(struct inpcb *inp) 1544 { 1545 struct inpcbinfo *pcbinfo; 1546 1547 KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__)); 1548 1549 INP_WLOCK_ASSERT(inp); 1550 1551 if (refcount_release(&inp->inp_refcount) == 0) { 1552 /* 1553 * If the inpcb has been freed, let the caller know, even if 1554 * this isn't the last reference. 1555 */ 1556 if (inp->inp_flags2 & INP_FREED) { 1557 INP_WUNLOCK(inp); 1558 return (1); 1559 } 1560 return (0); 1561 } 1562 1563 KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__)); 1564 #ifdef TCPHPTS 1565 if (inp->inp_in_hpts || inp->inp_in_input) { 1566 struct tcp_hpts_entry *hpts; 1567 /* 1568 * We should not be on the hpts at 1569 * this point in any form. we must 1570 * get the lock to be sure. 1571 */ 1572 hpts = tcp_hpts_lock(inp); 1573 if (inp->inp_in_hpts) 1574 panic("Hpts:%p inp:%p at free still on hpts", 1575 hpts, inp); 1576 mtx_unlock(&hpts->p_mtx); 1577 hpts = tcp_input_lock(inp); 1578 if (inp->inp_in_input) 1579 panic("Hpts:%p inp:%p at free still on input hpts", 1580 hpts, inp); 1581 mtx_unlock(&hpts->p_mtx); 1582 } 1583 #endif 1584 INP_WUNLOCK(inp); 1585 pcbinfo = inp->inp_pcbinfo; 1586 uma_zfree(pcbinfo->ipi_zone, inp); 1587 return (1); 1588 } 1589 1590 /* 1591 * Temporary wrapper. 1592 */ 1593 int 1594 in_pcbrele(struct inpcb *inp) 1595 { 1596 1597 return (in_pcbrele_wlocked(inp)); 1598 } 1599 1600 void 1601 in_pcblist_rele_rlocked(epoch_context_t ctx) 1602 { 1603 struct in_pcblist *il; 1604 struct inpcb *inp; 1605 struct inpcbinfo *pcbinfo; 1606 int i, n; 1607 1608 il = __containerof(ctx, struct in_pcblist, il_epoch_ctx); 1609 pcbinfo = il->il_pcbinfo; 1610 n = il->il_count; 1611 INP_INFO_WLOCK(pcbinfo); 1612 for (i = 0; i < n; i++) { 1613 inp = il->il_inp_list[i]; 1614 INP_RLOCK(inp); 1615 if (!in_pcbrele_rlocked(inp)) 1616 INP_RUNLOCK(inp); 1617 } 1618 INP_INFO_WUNLOCK(pcbinfo); 1619 free(il, M_TEMP); 1620 } 1621 1622 static void 1623 inpcbport_free(epoch_context_t ctx) 1624 { 1625 struct inpcbport *phd; 1626 1627 phd = __containerof(ctx, struct inpcbport, phd_epoch_ctx); 1628 free(phd, M_PCB); 1629 } 1630 1631 static void 1632 in_pcbfree_deferred(epoch_context_t ctx) 1633 { 1634 struct inpcb *inp; 1635 int released __unused; 1636 1637 inp = __containerof(ctx, struct inpcb, inp_epoch_ctx); 1638 1639 INP_WLOCK(inp); 1640 CURVNET_SET(inp->inp_vnet); 1641 #ifdef INET 1642 struct ip_moptions *imo = inp->inp_moptions; 1643 inp->inp_moptions = NULL; 1644 #endif 1645 /* XXXRW: Do as much as possible here. */ 1646 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1647 if (inp->inp_sp != NULL) 1648 ipsec_delete_pcbpolicy(inp); 1649 #endif 1650 #ifdef INET6 1651 struct ip6_moptions *im6o = NULL; 1652 if (inp->inp_vflag & INP_IPV6PROTO) { 1653 ip6_freepcbopts(inp->in6p_outputopts); 1654 im6o = inp->in6p_moptions; 1655 inp->in6p_moptions = NULL; 1656 } 1657 #endif 1658 if (inp->inp_options) 1659 (void)m_free(inp->inp_options); 1660 inp->inp_vflag = 0; 1661 crfree(inp->inp_cred); 1662 #ifdef MAC 1663 mac_inpcb_destroy(inp); 1664 #endif 1665 released = in_pcbrele_wlocked(inp); 1666 MPASS(released); 1667 #ifdef INET6 1668 ip6_freemoptions(im6o); 1669 #endif 1670 #ifdef INET 1671 inp_freemoptions(imo); 1672 #endif 1673 CURVNET_RESTORE(); 1674 } 1675 1676 /* 1677 * Unconditionally schedule an inpcb to be freed by decrementing its 1678 * reference count, which should occur only after the inpcb has been detached 1679 * from its socket. If another thread holds a temporary reference (acquired 1680 * using in_pcbref()) then the free is deferred until that reference is 1681 * released using in_pcbrele(), but the inpcb is still unlocked. Almost all 1682 * work, including removal from global lists, is done in this context, where 1683 * the pcbinfo lock is held. 1684 */ 1685 void 1686 in_pcbfree(struct inpcb *inp) 1687 { 1688 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 1689 1690 KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__)); 1691 KASSERT((inp->inp_flags2 & INP_FREED) == 0, 1692 ("%s: called twice for pcb %p", __func__, inp)); 1693 if (inp->inp_flags2 & INP_FREED) { 1694 INP_WUNLOCK(inp); 1695 return; 1696 } 1697 1698 INP_WLOCK_ASSERT(inp); 1699 INP_LIST_WLOCK(pcbinfo); 1700 in_pcbremlists(inp); 1701 INP_LIST_WUNLOCK(pcbinfo); 1702 RO_INVALIDATE_CACHE(&inp->inp_route); 1703 /* mark as destruction in progress */ 1704 inp->inp_flags2 |= INP_FREED; 1705 INP_WUNLOCK(inp); 1706 NET_EPOCH_CALL(in_pcbfree_deferred, &inp->inp_epoch_ctx); 1707 } 1708 1709 /* 1710 * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and 1711 * port reservation, and preventing it from being returned by inpcb lookups. 1712 * 1713 * It is used by TCP to mark an inpcb as unused and avoid future packet 1714 * delivery or event notification when a socket remains open but TCP has 1715 * closed. This might occur as a result of a shutdown()-initiated TCP close 1716 * or a RST on the wire, and allows the port binding to be reused while still 1717 * maintaining the invariant that so_pcb always points to a valid inpcb until 1718 * in_pcbdetach(). 1719 * 1720 * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by 1721 * in_pcbnotifyall() and in_pcbpurgeif0()? 1722 */ 1723 void 1724 in_pcbdrop(struct inpcb *inp) 1725 { 1726 1727 INP_WLOCK_ASSERT(inp); 1728 #ifdef INVARIANTS 1729 if (inp->inp_socket != NULL && inp->inp_ppcb != NULL) 1730 MPASS(inp->inp_refcount > 1); 1731 #endif 1732 1733 /* 1734 * XXXRW: Possibly we should protect the setting of INP_DROPPED with 1735 * the hash lock...? 1736 */ 1737 inp->inp_flags |= INP_DROPPED; 1738 if (inp->inp_flags & INP_INHASHLIST) { 1739 struct inpcbport *phd = inp->inp_phd; 1740 1741 INP_HASH_WLOCK(inp->inp_pcbinfo); 1742 in_pcbremlbgrouphash(inp); 1743 CK_LIST_REMOVE(inp, inp_hash); 1744 CK_LIST_REMOVE(inp, inp_portlist); 1745 if (CK_LIST_FIRST(&phd->phd_pcblist) == NULL) { 1746 CK_LIST_REMOVE(phd, phd_hash); 1747 NET_EPOCH_CALL(inpcbport_free, &phd->phd_epoch_ctx); 1748 } 1749 INP_HASH_WUNLOCK(inp->inp_pcbinfo); 1750 inp->inp_flags &= ~INP_INHASHLIST; 1751 #ifdef PCBGROUP 1752 in_pcbgroup_remove(inp); 1753 #endif 1754 } 1755 } 1756 1757 #ifdef INET 1758 /* 1759 * Common routines to return the socket addresses associated with inpcbs. 1760 */ 1761 struct sockaddr * 1762 in_sockaddr(in_port_t port, struct in_addr *addr_p) 1763 { 1764 struct sockaddr_in *sin; 1765 1766 sin = malloc(sizeof *sin, M_SONAME, 1767 M_WAITOK | M_ZERO); 1768 sin->sin_family = AF_INET; 1769 sin->sin_len = sizeof(*sin); 1770 sin->sin_addr = *addr_p; 1771 sin->sin_port = port; 1772 1773 return (struct sockaddr *)sin; 1774 } 1775 1776 int 1777 in_getsockaddr(struct socket *so, struct sockaddr **nam) 1778 { 1779 struct inpcb *inp; 1780 struct in_addr addr; 1781 in_port_t port; 1782 1783 inp = sotoinpcb(so); 1784 KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL")); 1785 1786 INP_RLOCK(inp); 1787 port = inp->inp_lport; 1788 addr = inp->inp_laddr; 1789 INP_RUNLOCK(inp); 1790 1791 *nam = in_sockaddr(port, &addr); 1792 return 0; 1793 } 1794 1795 int 1796 in_getpeeraddr(struct socket *so, struct sockaddr **nam) 1797 { 1798 struct inpcb *inp; 1799 struct in_addr addr; 1800 in_port_t port; 1801 1802 inp = sotoinpcb(so); 1803 KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL")); 1804 1805 INP_RLOCK(inp); 1806 port = inp->inp_fport; 1807 addr = inp->inp_faddr; 1808 INP_RUNLOCK(inp); 1809 1810 *nam = in_sockaddr(port, &addr); 1811 return 0; 1812 } 1813 1814 void 1815 in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno, 1816 struct inpcb *(*notify)(struct inpcb *, int)) 1817 { 1818 struct inpcb *inp, *inp_temp; 1819 1820 INP_INFO_WLOCK(pcbinfo); 1821 CK_LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) { 1822 INP_WLOCK(inp); 1823 #ifdef INET6 1824 if ((inp->inp_vflag & INP_IPV4) == 0) { 1825 INP_WUNLOCK(inp); 1826 continue; 1827 } 1828 #endif 1829 if (inp->inp_faddr.s_addr != faddr.s_addr || 1830 inp->inp_socket == NULL) { 1831 INP_WUNLOCK(inp); 1832 continue; 1833 } 1834 if ((*notify)(inp, errno)) 1835 INP_WUNLOCK(inp); 1836 } 1837 INP_INFO_WUNLOCK(pcbinfo); 1838 } 1839 1840 void 1841 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 1842 { 1843 struct inpcb *inp; 1844 struct in_multi *inm; 1845 struct in_mfilter *imf; 1846 struct ip_moptions *imo; 1847 1848 INP_INFO_WLOCK(pcbinfo); 1849 CK_LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) { 1850 INP_WLOCK(inp); 1851 imo = inp->inp_moptions; 1852 if ((inp->inp_vflag & INP_IPV4) && 1853 imo != NULL) { 1854 /* 1855 * Unselect the outgoing interface if it is being 1856 * detached. 1857 */ 1858 if (imo->imo_multicast_ifp == ifp) 1859 imo->imo_multicast_ifp = NULL; 1860 1861 /* 1862 * Drop multicast group membership if we joined 1863 * through the interface being detached. 1864 * 1865 * XXX This can all be deferred to an epoch_call 1866 */ 1867 restart: 1868 IP_MFILTER_FOREACH(imf, &imo->imo_head) { 1869 if ((inm = imf->imf_inm) == NULL) 1870 continue; 1871 if (inm->inm_ifp != ifp) 1872 continue; 1873 ip_mfilter_remove(&imo->imo_head, imf); 1874 IN_MULTI_LOCK_ASSERT(); 1875 in_leavegroup_locked(inm, NULL); 1876 ip_mfilter_free(imf); 1877 goto restart; 1878 } 1879 } 1880 INP_WUNLOCK(inp); 1881 } 1882 INP_INFO_WUNLOCK(pcbinfo); 1883 } 1884 1885 /* 1886 * Lookup a PCB based on the local address and port. Caller must hold the 1887 * hash lock. No inpcb locks or references are acquired. 1888 */ 1889 #define INP_LOOKUP_MAPPED_PCB_COST 3 1890 struct inpcb * 1891 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr, 1892 u_short lport, int lookupflags, struct ucred *cred) 1893 { 1894 struct inpcb *inp; 1895 #ifdef INET6 1896 int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST; 1897 #else 1898 int matchwild = 3; 1899 #endif 1900 int wildcard; 1901 1902 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0, 1903 ("%s: invalid lookup flags %d", __func__, lookupflags)); 1904 1905 INP_HASH_LOCK_ASSERT(pcbinfo); 1906 1907 if ((lookupflags & INPLOOKUP_WILDCARD) == 0) { 1908 struct inpcbhead *head; 1909 /* 1910 * Look for an unconnected (wildcard foreign addr) PCB that 1911 * matches the local address and port we're looking for. 1912 */ 1913 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 1914 0, pcbinfo->ipi_hashmask)]; 1915 CK_LIST_FOREACH(inp, head, inp_hash) { 1916 #ifdef INET6 1917 /* XXX inp locking */ 1918 if ((inp->inp_vflag & INP_IPV4) == 0) 1919 continue; 1920 #endif 1921 if (inp->inp_faddr.s_addr == INADDR_ANY && 1922 inp->inp_laddr.s_addr == laddr.s_addr && 1923 inp->inp_lport == lport) { 1924 /* 1925 * Found? 1926 */ 1927 if (cred == NULL || 1928 prison_equal_ip4(cred->cr_prison, 1929 inp->inp_cred->cr_prison)) 1930 return (inp); 1931 } 1932 } 1933 /* 1934 * Not found. 1935 */ 1936 return (NULL); 1937 } else { 1938 struct inpcbporthead *porthash; 1939 struct inpcbport *phd; 1940 struct inpcb *match = NULL; 1941 /* 1942 * Best fit PCB lookup. 1943 * 1944 * First see if this local port is in use by looking on the 1945 * port hash list. 1946 */ 1947 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 1948 pcbinfo->ipi_porthashmask)]; 1949 CK_LIST_FOREACH(phd, porthash, phd_hash) { 1950 if (phd->phd_port == lport) 1951 break; 1952 } 1953 if (phd != NULL) { 1954 /* 1955 * Port is in use by one or more PCBs. Look for best 1956 * fit. 1957 */ 1958 CK_LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 1959 wildcard = 0; 1960 if (cred != NULL && 1961 !prison_equal_ip4(inp->inp_cred->cr_prison, 1962 cred->cr_prison)) 1963 continue; 1964 #ifdef INET6 1965 /* XXX inp locking */ 1966 if ((inp->inp_vflag & INP_IPV4) == 0) 1967 continue; 1968 /* 1969 * We never select the PCB that has 1970 * INP_IPV6 flag and is bound to :: if 1971 * we have another PCB which is bound 1972 * to 0.0.0.0. If a PCB has the 1973 * INP_IPV6 flag, then we set its cost 1974 * higher than IPv4 only PCBs. 1975 * 1976 * Note that the case only happens 1977 * when a socket is bound to ::, under 1978 * the condition that the use of the 1979 * mapped address is allowed. 1980 */ 1981 if ((inp->inp_vflag & INP_IPV6) != 0) 1982 wildcard += INP_LOOKUP_MAPPED_PCB_COST; 1983 #endif 1984 if (inp->inp_faddr.s_addr != INADDR_ANY) 1985 wildcard++; 1986 if (inp->inp_laddr.s_addr != INADDR_ANY) { 1987 if (laddr.s_addr == INADDR_ANY) 1988 wildcard++; 1989 else if (inp->inp_laddr.s_addr != laddr.s_addr) 1990 continue; 1991 } else { 1992 if (laddr.s_addr != INADDR_ANY) 1993 wildcard++; 1994 } 1995 if (wildcard < matchwild) { 1996 match = inp; 1997 matchwild = wildcard; 1998 if (matchwild == 0) 1999 break; 2000 } 2001 } 2002 } 2003 return (match); 2004 } 2005 } 2006 #undef INP_LOOKUP_MAPPED_PCB_COST 2007 2008 static struct inpcb * 2009 in_pcblookup_lbgroup(const struct inpcbinfo *pcbinfo, 2010 const struct in_addr *laddr, uint16_t lport, const struct in_addr *faddr, 2011 uint16_t fport, int lookupflags) 2012 { 2013 struct inpcb *local_wild; 2014 const struct inpcblbgrouphead *hdr; 2015 struct inpcblbgroup *grp; 2016 uint32_t idx; 2017 2018 INP_HASH_LOCK_ASSERT(pcbinfo); 2019 2020 hdr = &pcbinfo->ipi_lbgrouphashbase[ 2021 INP_PCBPORTHASH(lport, pcbinfo->ipi_lbgrouphashmask)]; 2022 2023 /* 2024 * Order of socket selection: 2025 * 1. non-wild. 2026 * 2. wild (if lookupflags contains INPLOOKUP_WILDCARD). 2027 * 2028 * NOTE: 2029 * - Load balanced group does not contain jailed sockets 2030 * - Load balanced group does not contain IPv4 mapped INET6 wild sockets 2031 */ 2032 local_wild = NULL; 2033 CK_LIST_FOREACH(grp, hdr, il_list) { 2034 #ifdef INET6 2035 if (!(grp->il_vflag & INP_IPV4)) 2036 continue; 2037 #endif 2038 if (grp->il_lport != lport) 2039 continue; 2040 2041 idx = INP_PCBLBGROUP_PKTHASH(faddr->s_addr, lport, fport) % 2042 grp->il_inpcnt; 2043 if (grp->il_laddr.s_addr == laddr->s_addr) 2044 return (grp->il_inp[idx]); 2045 if (grp->il_laddr.s_addr == INADDR_ANY && 2046 (lookupflags & INPLOOKUP_WILDCARD) != 0) 2047 local_wild = grp->il_inp[idx]; 2048 } 2049 return (local_wild); 2050 } 2051 2052 #ifdef PCBGROUP 2053 /* 2054 * Lookup PCB in hash list, using pcbgroup tables. 2055 */ 2056 static struct inpcb * 2057 in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup, 2058 struct in_addr faddr, u_int fport_arg, struct in_addr laddr, 2059 u_int lport_arg, int lookupflags, struct ifnet *ifp) 2060 { 2061 struct inpcbhead *head; 2062 struct inpcb *inp, *tmpinp; 2063 u_short fport = fport_arg, lport = lport_arg; 2064 bool locked; 2065 2066 /* 2067 * First look for an exact match. 2068 */ 2069 tmpinp = NULL; 2070 INP_GROUP_LOCK(pcbgroup); 2071 head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, 2072 pcbgroup->ipg_hashmask)]; 2073 CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) { 2074 #ifdef INET6 2075 /* XXX inp locking */ 2076 if ((inp->inp_vflag & INP_IPV4) == 0) 2077 continue; 2078 #endif 2079 if (inp->inp_faddr.s_addr == faddr.s_addr && 2080 inp->inp_laddr.s_addr == laddr.s_addr && 2081 inp->inp_fport == fport && 2082 inp->inp_lport == lport) { 2083 /* 2084 * XXX We should be able to directly return 2085 * the inp here, without any checks. 2086 * Well unless both bound with SO_REUSEPORT? 2087 */ 2088 if (prison_flag(inp->inp_cred, PR_IP4)) 2089 goto found; 2090 if (tmpinp == NULL) 2091 tmpinp = inp; 2092 } 2093 } 2094 if (tmpinp != NULL) { 2095 inp = tmpinp; 2096 goto found; 2097 } 2098 2099 #ifdef RSS 2100 /* 2101 * For incoming connections, we may wish to do a wildcard 2102 * match for an RSS-local socket. 2103 */ 2104 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 2105 struct inpcb *local_wild = NULL, *local_exact = NULL; 2106 #ifdef INET6 2107 struct inpcb *local_wild_mapped = NULL; 2108 #endif 2109 struct inpcb *jail_wild = NULL; 2110 struct inpcbhead *head; 2111 int injail; 2112 2113 /* 2114 * Order of socket selection - we always prefer jails. 2115 * 1. jailed, non-wild. 2116 * 2. jailed, wild. 2117 * 3. non-jailed, non-wild. 2118 * 4. non-jailed, wild. 2119 */ 2120 2121 head = &pcbgroup->ipg_hashbase[INP_PCBHASH(INADDR_ANY, 2122 lport, 0, pcbgroup->ipg_hashmask)]; 2123 CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) { 2124 #ifdef INET6 2125 /* XXX inp locking */ 2126 if ((inp->inp_vflag & INP_IPV4) == 0) 2127 continue; 2128 #endif 2129 if (inp->inp_faddr.s_addr != INADDR_ANY || 2130 inp->inp_lport != lport) 2131 continue; 2132 2133 injail = prison_flag(inp->inp_cred, PR_IP4); 2134 if (injail) { 2135 if (prison_check_ip4(inp->inp_cred, 2136 &laddr) != 0) 2137 continue; 2138 } else { 2139 if (local_exact != NULL) 2140 continue; 2141 } 2142 2143 if (inp->inp_laddr.s_addr == laddr.s_addr) { 2144 if (injail) 2145 goto found; 2146 else 2147 local_exact = inp; 2148 } else if (inp->inp_laddr.s_addr == INADDR_ANY) { 2149 #ifdef INET6 2150 /* XXX inp locking, NULL check */ 2151 if (inp->inp_vflag & INP_IPV6PROTO) 2152 local_wild_mapped = inp; 2153 else 2154 #endif 2155 if (injail) 2156 jail_wild = inp; 2157 else 2158 local_wild = inp; 2159 } 2160 } /* LIST_FOREACH */ 2161 2162 inp = jail_wild; 2163 if (inp == NULL) 2164 inp = local_exact; 2165 if (inp == NULL) 2166 inp = local_wild; 2167 #ifdef INET6 2168 if (inp == NULL) 2169 inp = local_wild_mapped; 2170 #endif 2171 if (inp != NULL) 2172 goto found; 2173 } 2174 #endif 2175 2176 /* 2177 * Then look for a wildcard match, if requested. 2178 */ 2179 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 2180 struct inpcb *local_wild = NULL, *local_exact = NULL; 2181 #ifdef INET6 2182 struct inpcb *local_wild_mapped = NULL; 2183 #endif 2184 struct inpcb *jail_wild = NULL; 2185 struct inpcbhead *head; 2186 int injail; 2187 2188 /* 2189 * Order of socket selection - we always prefer jails. 2190 * 1. jailed, non-wild. 2191 * 2. jailed, wild. 2192 * 3. non-jailed, non-wild. 2193 * 4. non-jailed, wild. 2194 */ 2195 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport, 2196 0, pcbinfo->ipi_wildmask)]; 2197 CK_LIST_FOREACH(inp, head, inp_pcbgroup_wild) { 2198 #ifdef INET6 2199 /* XXX inp locking */ 2200 if ((inp->inp_vflag & INP_IPV4) == 0) 2201 continue; 2202 #endif 2203 if (inp->inp_faddr.s_addr != INADDR_ANY || 2204 inp->inp_lport != lport) 2205 continue; 2206 2207 injail = prison_flag(inp->inp_cred, PR_IP4); 2208 if (injail) { 2209 if (prison_check_ip4(inp->inp_cred, 2210 &laddr) != 0) 2211 continue; 2212 } else { 2213 if (local_exact != NULL) 2214 continue; 2215 } 2216 2217 if (inp->inp_laddr.s_addr == laddr.s_addr) { 2218 if (injail) 2219 goto found; 2220 else 2221 local_exact = inp; 2222 } else if (inp->inp_laddr.s_addr == INADDR_ANY) { 2223 #ifdef INET6 2224 /* XXX inp locking, NULL check */ 2225 if (inp->inp_vflag & INP_IPV6PROTO) 2226 local_wild_mapped = inp; 2227 else 2228 #endif 2229 if (injail) 2230 jail_wild = inp; 2231 else 2232 local_wild = inp; 2233 } 2234 } /* LIST_FOREACH */ 2235 inp = jail_wild; 2236 if (inp == NULL) 2237 inp = local_exact; 2238 if (inp == NULL) 2239 inp = local_wild; 2240 #ifdef INET6 2241 if (inp == NULL) 2242 inp = local_wild_mapped; 2243 #endif 2244 if (inp != NULL) 2245 goto found; 2246 } /* if (lookupflags & INPLOOKUP_WILDCARD) */ 2247 INP_GROUP_UNLOCK(pcbgroup); 2248 return (NULL); 2249 2250 found: 2251 if (lookupflags & INPLOOKUP_WLOCKPCB) 2252 locked = INP_TRY_WLOCK(inp); 2253 else if (lookupflags & INPLOOKUP_RLOCKPCB) 2254 locked = INP_TRY_RLOCK(inp); 2255 else 2256 panic("%s: locking bug", __func__); 2257 if (__predict_false(locked && (inp->inp_flags2 & INP_FREED))) { 2258 if (lookupflags & INPLOOKUP_WLOCKPCB) 2259 INP_WUNLOCK(inp); 2260 else 2261 INP_RUNLOCK(inp); 2262 return (NULL); 2263 } else if (!locked) 2264 in_pcbref(inp); 2265 INP_GROUP_UNLOCK(pcbgroup); 2266 if (!locked) { 2267 if (lookupflags & INPLOOKUP_WLOCKPCB) { 2268 INP_WLOCK(inp); 2269 if (in_pcbrele_wlocked(inp)) 2270 return (NULL); 2271 } else { 2272 INP_RLOCK(inp); 2273 if (in_pcbrele_rlocked(inp)) 2274 return (NULL); 2275 } 2276 } 2277 #ifdef INVARIANTS 2278 if (lookupflags & INPLOOKUP_WLOCKPCB) 2279 INP_WLOCK_ASSERT(inp); 2280 else 2281 INP_RLOCK_ASSERT(inp); 2282 #endif 2283 return (inp); 2284 } 2285 #endif /* PCBGROUP */ 2286 2287 /* 2288 * Lookup PCB in hash list, using pcbinfo tables. This variation assumes 2289 * that the caller has locked the hash list, and will not perform any further 2290 * locking or reference operations on either the hash list or the connection. 2291 */ 2292 static struct inpcb * 2293 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr, 2294 u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags, 2295 struct ifnet *ifp) 2296 { 2297 struct inpcbhead *head; 2298 struct inpcb *inp, *tmpinp; 2299 u_short fport = fport_arg, lport = lport_arg; 2300 2301 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0, 2302 ("%s: invalid lookup flags %d", __func__, lookupflags)); 2303 INP_HASH_LOCK_ASSERT(pcbinfo); 2304 2305 /* 2306 * First look for an exact match. 2307 */ 2308 tmpinp = NULL; 2309 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, 2310 pcbinfo->ipi_hashmask)]; 2311 CK_LIST_FOREACH(inp, head, inp_hash) { 2312 #ifdef INET6 2313 /* XXX inp locking */ 2314 if ((inp->inp_vflag & INP_IPV4) == 0) 2315 continue; 2316 #endif 2317 if (inp->inp_faddr.s_addr == faddr.s_addr && 2318 inp->inp_laddr.s_addr == laddr.s_addr && 2319 inp->inp_fport == fport && 2320 inp->inp_lport == lport) { 2321 /* 2322 * XXX We should be able to directly return 2323 * the inp here, without any checks. 2324 * Well unless both bound with SO_REUSEPORT? 2325 */ 2326 if (prison_flag(inp->inp_cred, PR_IP4)) 2327 return (inp); 2328 if (tmpinp == NULL) 2329 tmpinp = inp; 2330 } 2331 } 2332 if (tmpinp != NULL) 2333 return (tmpinp); 2334 2335 /* 2336 * Then look in lb group (for wildcard match). 2337 */ 2338 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 2339 inp = in_pcblookup_lbgroup(pcbinfo, &laddr, lport, &faddr, 2340 fport, lookupflags); 2341 if (inp != NULL) 2342 return (inp); 2343 } 2344 2345 /* 2346 * Then look for a wildcard match, if requested. 2347 */ 2348 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 2349 struct inpcb *local_wild = NULL, *local_exact = NULL; 2350 #ifdef INET6 2351 struct inpcb *local_wild_mapped = NULL; 2352 #endif 2353 struct inpcb *jail_wild = NULL; 2354 int injail; 2355 2356 /* 2357 * Order of socket selection - we always prefer jails. 2358 * 1. jailed, non-wild. 2359 * 2. jailed, wild. 2360 * 3. non-jailed, non-wild. 2361 * 4. non-jailed, wild. 2362 */ 2363 2364 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 2365 0, pcbinfo->ipi_hashmask)]; 2366 CK_LIST_FOREACH(inp, head, inp_hash) { 2367 #ifdef INET6 2368 /* XXX inp locking */ 2369 if ((inp->inp_vflag & INP_IPV4) == 0) 2370 continue; 2371 #endif 2372 if (inp->inp_faddr.s_addr != INADDR_ANY || 2373 inp->inp_lport != lport) 2374 continue; 2375 2376 injail = prison_flag(inp->inp_cred, PR_IP4); 2377 if (injail) { 2378 if (prison_check_ip4(inp->inp_cred, 2379 &laddr) != 0) 2380 continue; 2381 } else { 2382 if (local_exact != NULL) 2383 continue; 2384 } 2385 2386 if (inp->inp_laddr.s_addr == laddr.s_addr) { 2387 if (injail) 2388 return (inp); 2389 else 2390 local_exact = inp; 2391 } else if (inp->inp_laddr.s_addr == INADDR_ANY) { 2392 #ifdef INET6 2393 /* XXX inp locking, NULL check */ 2394 if (inp->inp_vflag & INP_IPV6PROTO) 2395 local_wild_mapped = inp; 2396 else 2397 #endif 2398 if (injail) 2399 jail_wild = inp; 2400 else 2401 local_wild = inp; 2402 } 2403 } /* LIST_FOREACH */ 2404 if (jail_wild != NULL) 2405 return (jail_wild); 2406 if (local_exact != NULL) 2407 return (local_exact); 2408 if (local_wild != NULL) 2409 return (local_wild); 2410 #ifdef INET6 2411 if (local_wild_mapped != NULL) 2412 return (local_wild_mapped); 2413 #endif 2414 } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */ 2415 2416 return (NULL); 2417 } 2418 2419 /* 2420 * Lookup PCB in hash list, using pcbinfo tables. This variation locks the 2421 * hash list lock, and will return the inpcb locked (i.e., requires 2422 * INPLOOKUP_LOCKPCB). 2423 */ 2424 static struct inpcb * 2425 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr, 2426 u_int fport, struct in_addr laddr, u_int lport, int lookupflags, 2427 struct ifnet *ifp) 2428 { 2429 struct inpcb *inp; 2430 2431 inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport, 2432 (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp); 2433 if (inp != NULL) { 2434 if (lookupflags & INPLOOKUP_WLOCKPCB) { 2435 INP_WLOCK(inp); 2436 if (__predict_false(inp->inp_flags2 & INP_FREED)) { 2437 INP_WUNLOCK(inp); 2438 inp = NULL; 2439 } 2440 } else if (lookupflags & INPLOOKUP_RLOCKPCB) { 2441 INP_RLOCK(inp); 2442 if (__predict_false(inp->inp_flags2 & INP_FREED)) { 2443 INP_RUNLOCK(inp); 2444 inp = NULL; 2445 } 2446 } else 2447 panic("%s: locking bug", __func__); 2448 #ifdef INVARIANTS 2449 if (inp != NULL) { 2450 if (lookupflags & INPLOOKUP_WLOCKPCB) 2451 INP_WLOCK_ASSERT(inp); 2452 else 2453 INP_RLOCK_ASSERT(inp); 2454 } 2455 #endif 2456 } 2457 2458 return (inp); 2459 } 2460 2461 /* 2462 * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf 2463 * from which a pre-calculated hash value may be extracted. 2464 * 2465 * Possibly more of this logic should be in in_pcbgroup.c. 2466 */ 2467 struct inpcb * 2468 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport, 2469 struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp) 2470 { 2471 #if defined(PCBGROUP) && !defined(RSS) 2472 struct inpcbgroup *pcbgroup; 2473 #endif 2474 2475 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0, 2476 ("%s: invalid lookup flags %d", __func__, lookupflags)); 2477 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0, 2478 ("%s: LOCKPCB not set", __func__)); 2479 2480 /* 2481 * When not using RSS, use connection groups in preference to the 2482 * reservation table when looking up 4-tuples. When using RSS, just 2483 * use the reservation table, due to the cost of the Toeplitz hash 2484 * in software. 2485 * 2486 * XXXRW: This policy belongs in the pcbgroup code, as in principle 2487 * we could be doing RSS with a non-Toeplitz hash that is affordable 2488 * in software. 2489 */ 2490 #if defined(PCBGROUP) && !defined(RSS) 2491 if (in_pcbgroup_enabled(pcbinfo)) { 2492 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr, 2493 fport); 2494 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport, 2495 laddr, lport, lookupflags, ifp)); 2496 } 2497 #endif 2498 return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport, 2499 lookupflags, ifp)); 2500 } 2501 2502 struct inpcb * 2503 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr, 2504 u_int fport, struct in_addr laddr, u_int lport, int lookupflags, 2505 struct ifnet *ifp, struct mbuf *m) 2506 { 2507 #ifdef PCBGROUP 2508 struct inpcbgroup *pcbgroup; 2509 #endif 2510 2511 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0, 2512 ("%s: invalid lookup flags %d", __func__, lookupflags)); 2513 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0, 2514 ("%s: LOCKPCB not set", __func__)); 2515 2516 #ifdef PCBGROUP 2517 /* 2518 * If we can use a hardware-generated hash to look up the connection 2519 * group, use that connection group to find the inpcb. Otherwise 2520 * fall back on a software hash -- or the reservation table if we're 2521 * using RSS. 2522 * 2523 * XXXRW: As above, that policy belongs in the pcbgroup code. 2524 */ 2525 if (in_pcbgroup_enabled(pcbinfo) && 2526 !(M_HASHTYPE_TEST(m, M_HASHTYPE_NONE))) { 2527 pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m), 2528 m->m_pkthdr.flowid); 2529 if (pcbgroup != NULL) 2530 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, 2531 fport, laddr, lport, lookupflags, ifp)); 2532 #ifndef RSS 2533 pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr, 2534 fport); 2535 return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport, 2536 laddr, lport, lookupflags, ifp)); 2537 #endif 2538 } 2539 #endif 2540 return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport, 2541 lookupflags, ifp)); 2542 } 2543 #endif /* INET */ 2544 2545 /* 2546 * Insert PCB onto various hash lists. 2547 */ 2548 static int 2549 in_pcbinshash_internal(struct inpcb *inp, struct mbuf *m) 2550 { 2551 struct inpcbhead *pcbhash; 2552 struct inpcbporthead *pcbporthash; 2553 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 2554 struct inpcbport *phd; 2555 u_int32_t hashkey_faddr; 2556 int so_options; 2557 2558 INP_WLOCK_ASSERT(inp); 2559 INP_HASH_WLOCK_ASSERT(pcbinfo); 2560 2561 KASSERT((inp->inp_flags & INP_INHASHLIST) == 0, 2562 ("in_pcbinshash: INP_INHASHLIST")); 2563 2564 #ifdef INET6 2565 if (inp->inp_vflag & INP_IPV6) 2566 hashkey_faddr = INP6_PCBHASHKEY(&inp->in6p_faddr); 2567 else 2568 #endif 2569 hashkey_faddr = inp->inp_faddr.s_addr; 2570 2571 pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr, 2572 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)]; 2573 2574 pcbporthash = &pcbinfo->ipi_porthashbase[ 2575 INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)]; 2576 2577 /* 2578 * Add entry to load balance group. 2579 * Only do this if SO_REUSEPORT_LB is set. 2580 */ 2581 so_options = inp_so_options(inp); 2582 if (so_options & SO_REUSEPORT_LB) { 2583 int ret = in_pcbinslbgrouphash(inp); 2584 if (ret) { 2585 /* pcb lb group malloc fail (ret=ENOBUFS). */ 2586 return (ret); 2587 } 2588 } 2589 2590 /* 2591 * Go through port list and look for a head for this lport. 2592 */ 2593 CK_LIST_FOREACH(phd, pcbporthash, phd_hash) { 2594 if (phd->phd_port == inp->inp_lport) 2595 break; 2596 } 2597 /* 2598 * If none exists, malloc one and tack it on. 2599 */ 2600 if (phd == NULL) { 2601 phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT); 2602 if (phd == NULL) { 2603 return (ENOBUFS); /* XXX */ 2604 } 2605 bzero(&phd->phd_epoch_ctx, sizeof(struct epoch_context)); 2606 phd->phd_port = inp->inp_lport; 2607 CK_LIST_INIT(&phd->phd_pcblist); 2608 CK_LIST_INSERT_HEAD(pcbporthash, phd, phd_hash); 2609 } 2610 inp->inp_phd = phd; 2611 CK_LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist); 2612 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 2613 inp->inp_flags |= INP_INHASHLIST; 2614 #ifdef PCBGROUP 2615 if (m != NULL) { 2616 in_pcbgroup_update_mbuf(inp, m); 2617 } else { 2618 in_pcbgroup_update(inp); 2619 } 2620 #endif 2621 return (0); 2622 } 2623 2624 int 2625 in_pcbinshash(struct inpcb *inp) 2626 { 2627 2628 return (in_pcbinshash_internal(inp, NULL)); 2629 } 2630 2631 int 2632 in_pcbinshash_mbuf(struct inpcb *inp, struct mbuf *m) 2633 { 2634 2635 return (in_pcbinshash_internal(inp, m)); 2636 } 2637 2638 /* 2639 * Move PCB to the proper hash bucket when { faddr, fport } have been 2640 * changed. NOTE: This does not handle the case of the lport changing (the 2641 * hashed port list would have to be updated as well), so the lport must 2642 * not change after in_pcbinshash() has been called. 2643 */ 2644 void 2645 in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m) 2646 { 2647 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 2648 struct inpcbhead *head; 2649 u_int32_t hashkey_faddr; 2650 2651 INP_WLOCK_ASSERT(inp); 2652 INP_HASH_WLOCK_ASSERT(pcbinfo); 2653 2654 KASSERT(inp->inp_flags & INP_INHASHLIST, 2655 ("in_pcbrehash: !INP_INHASHLIST")); 2656 2657 #ifdef INET6 2658 if (inp->inp_vflag & INP_IPV6) 2659 hashkey_faddr = INP6_PCBHASHKEY(&inp->in6p_faddr); 2660 else 2661 #endif 2662 hashkey_faddr = inp->inp_faddr.s_addr; 2663 2664 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr, 2665 inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)]; 2666 2667 CK_LIST_REMOVE(inp, inp_hash); 2668 CK_LIST_INSERT_HEAD(head, inp, inp_hash); 2669 2670 #ifdef PCBGROUP 2671 if (m != NULL) 2672 in_pcbgroup_update_mbuf(inp, m); 2673 else 2674 in_pcbgroup_update(inp); 2675 #endif 2676 } 2677 2678 void 2679 in_pcbrehash(struct inpcb *inp) 2680 { 2681 2682 in_pcbrehash_mbuf(inp, NULL); 2683 } 2684 2685 /* 2686 * Remove PCB from various lists. 2687 */ 2688 static void 2689 in_pcbremlists(struct inpcb *inp) 2690 { 2691 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 2692 2693 INP_WLOCK_ASSERT(inp); 2694 INP_LIST_WLOCK_ASSERT(pcbinfo); 2695 2696 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 2697 if (inp->inp_flags & INP_INHASHLIST) { 2698 struct inpcbport *phd = inp->inp_phd; 2699 2700 INP_HASH_WLOCK(pcbinfo); 2701 2702 /* XXX: Only do if SO_REUSEPORT_LB set? */ 2703 in_pcbremlbgrouphash(inp); 2704 2705 CK_LIST_REMOVE(inp, inp_hash); 2706 CK_LIST_REMOVE(inp, inp_portlist); 2707 if (CK_LIST_FIRST(&phd->phd_pcblist) == NULL) { 2708 CK_LIST_REMOVE(phd, phd_hash); 2709 NET_EPOCH_CALL(inpcbport_free, &phd->phd_epoch_ctx); 2710 } 2711 INP_HASH_WUNLOCK(pcbinfo); 2712 inp->inp_flags &= ~INP_INHASHLIST; 2713 } 2714 CK_LIST_REMOVE(inp, inp_list); 2715 pcbinfo->ipi_count--; 2716 #ifdef PCBGROUP 2717 in_pcbgroup_remove(inp); 2718 #endif 2719 } 2720 2721 /* 2722 * Check for alternatives when higher level complains 2723 * about service problems. For now, invalidate cached 2724 * routing information. If the route was created dynamically 2725 * (by a redirect), time to try a default gateway again. 2726 */ 2727 void 2728 in_losing(struct inpcb *inp) 2729 { 2730 2731 RO_INVALIDATE_CACHE(&inp->inp_route); 2732 return; 2733 } 2734 2735 /* 2736 * A set label operation has occurred at the socket layer, propagate the 2737 * label change into the in_pcb for the socket. 2738 */ 2739 void 2740 in_pcbsosetlabel(struct socket *so) 2741 { 2742 #ifdef MAC 2743 struct inpcb *inp; 2744 2745 inp = sotoinpcb(so); 2746 KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL")); 2747 2748 INP_WLOCK(inp); 2749 SOCK_LOCK(so); 2750 mac_inpcb_sosetlabel(so, inp); 2751 SOCK_UNLOCK(so); 2752 INP_WUNLOCK(inp); 2753 #endif 2754 } 2755 2756 /* 2757 * ipport_tick runs once per second, determining if random port allocation 2758 * should be continued. If more than ipport_randomcps ports have been 2759 * allocated in the last second, then we return to sequential port 2760 * allocation. We return to random allocation only once we drop below 2761 * ipport_randomcps for at least ipport_randomtime seconds. 2762 */ 2763 static void 2764 ipport_tick(void *xtp) 2765 { 2766 VNET_ITERATOR_DECL(vnet_iter); 2767 2768 VNET_LIST_RLOCK_NOSLEEP(); 2769 VNET_FOREACH(vnet_iter) { 2770 CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */ 2771 if (V_ipport_tcpallocs <= 2772 V_ipport_tcplastcount + V_ipport_randomcps) { 2773 if (V_ipport_stoprandom > 0) 2774 V_ipport_stoprandom--; 2775 } else 2776 V_ipport_stoprandom = V_ipport_randomtime; 2777 V_ipport_tcplastcount = V_ipport_tcpallocs; 2778 CURVNET_RESTORE(); 2779 } 2780 VNET_LIST_RUNLOCK_NOSLEEP(); 2781 callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL); 2782 } 2783 2784 static void 2785 ip_fini(void *xtp) 2786 { 2787 2788 callout_stop(&ipport_tick_callout); 2789 } 2790 2791 /* 2792 * The ipport_callout should start running at about the time we attach the 2793 * inet or inet6 domains. 2794 */ 2795 static void 2796 ipport_tick_init(const void *unused __unused) 2797 { 2798 2799 /* Start ipport_tick. */ 2800 callout_init(&ipport_tick_callout, 1); 2801 callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL); 2802 EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL, 2803 SHUTDOWN_PRI_DEFAULT); 2804 } 2805 SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 2806 ipport_tick_init, NULL); 2807 2808 void 2809 inp_wlock(struct inpcb *inp) 2810 { 2811 2812 INP_WLOCK(inp); 2813 } 2814 2815 void 2816 inp_wunlock(struct inpcb *inp) 2817 { 2818 2819 INP_WUNLOCK(inp); 2820 } 2821 2822 void 2823 inp_rlock(struct inpcb *inp) 2824 { 2825 2826 INP_RLOCK(inp); 2827 } 2828 2829 void 2830 inp_runlock(struct inpcb *inp) 2831 { 2832 2833 INP_RUNLOCK(inp); 2834 } 2835 2836 #ifdef INVARIANT_SUPPORT 2837 void 2838 inp_lock_assert(struct inpcb *inp) 2839 { 2840 2841 INP_WLOCK_ASSERT(inp); 2842 } 2843 2844 void 2845 inp_unlock_assert(struct inpcb *inp) 2846 { 2847 2848 INP_UNLOCK_ASSERT(inp); 2849 } 2850 #endif 2851 2852 void 2853 inp_apply_all(void (*func)(struct inpcb *, void *), void *arg) 2854 { 2855 struct inpcb *inp; 2856 2857 INP_INFO_WLOCK(&V_tcbinfo); 2858 CK_LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) { 2859 INP_WLOCK(inp); 2860 func(inp, arg); 2861 INP_WUNLOCK(inp); 2862 } 2863 INP_INFO_WUNLOCK(&V_tcbinfo); 2864 } 2865 2866 struct socket * 2867 inp_inpcbtosocket(struct inpcb *inp) 2868 { 2869 2870 INP_WLOCK_ASSERT(inp); 2871 return (inp->inp_socket); 2872 } 2873 2874 struct tcpcb * 2875 inp_inpcbtotcpcb(struct inpcb *inp) 2876 { 2877 2878 INP_WLOCK_ASSERT(inp); 2879 return ((struct tcpcb *)inp->inp_ppcb); 2880 } 2881 2882 int 2883 inp_ip_tos_get(const struct inpcb *inp) 2884 { 2885 2886 return (inp->inp_ip_tos); 2887 } 2888 2889 void 2890 inp_ip_tos_set(struct inpcb *inp, int val) 2891 { 2892 2893 inp->inp_ip_tos = val; 2894 } 2895 2896 void 2897 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp, 2898 uint32_t *faddr, uint16_t *fp) 2899 { 2900 2901 INP_LOCK_ASSERT(inp); 2902 *laddr = inp->inp_laddr.s_addr; 2903 *faddr = inp->inp_faddr.s_addr; 2904 *lp = inp->inp_lport; 2905 *fp = inp->inp_fport; 2906 } 2907 2908 struct inpcb * 2909 so_sotoinpcb(struct socket *so) 2910 { 2911 2912 return (sotoinpcb(so)); 2913 } 2914 2915 struct tcpcb * 2916 so_sototcpcb(struct socket *so) 2917 { 2918 2919 return (sototcpcb(so)); 2920 } 2921 2922 /* 2923 * Create an external-format (``xinpcb'') structure using the information in 2924 * the kernel-format in_pcb structure pointed to by inp. This is done to 2925 * reduce the spew of irrelevant information over this interface, to isolate 2926 * user code from changes in the kernel structure, and potentially to provide 2927 * information-hiding if we decide that some of this information should be 2928 * hidden from users. 2929 */ 2930 void 2931 in_pcbtoxinpcb(const struct inpcb *inp, struct xinpcb *xi) 2932 { 2933 2934 bzero(xi, sizeof(*xi)); 2935 xi->xi_len = sizeof(struct xinpcb); 2936 if (inp->inp_socket) 2937 sotoxsocket(inp->inp_socket, &xi->xi_socket); 2938 bcopy(&inp->inp_inc, &xi->inp_inc, sizeof(struct in_conninfo)); 2939 xi->inp_gencnt = inp->inp_gencnt; 2940 xi->inp_ppcb = (uintptr_t)inp->inp_ppcb; 2941 xi->inp_flow = inp->inp_flow; 2942 xi->inp_flowid = inp->inp_flowid; 2943 xi->inp_flowtype = inp->inp_flowtype; 2944 xi->inp_flags = inp->inp_flags; 2945 xi->inp_flags2 = inp->inp_flags2; 2946 xi->inp_rss_listen_bucket = inp->inp_rss_listen_bucket; 2947 xi->in6p_cksum = inp->in6p_cksum; 2948 xi->in6p_hops = inp->in6p_hops; 2949 xi->inp_ip_tos = inp->inp_ip_tos; 2950 xi->inp_vflag = inp->inp_vflag; 2951 xi->inp_ip_ttl = inp->inp_ip_ttl; 2952 xi->inp_ip_p = inp->inp_ip_p; 2953 xi->inp_ip_minttl = inp->inp_ip_minttl; 2954 } 2955 2956 #ifdef DDB 2957 static void 2958 db_print_indent(int indent) 2959 { 2960 int i; 2961 2962 for (i = 0; i < indent; i++) 2963 db_printf(" "); 2964 } 2965 2966 static void 2967 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent) 2968 { 2969 char faddr_str[48], laddr_str[48]; 2970 2971 db_print_indent(indent); 2972 db_printf("%s at %p\n", name, inc); 2973 2974 indent += 2; 2975 2976 #ifdef INET6 2977 if (inc->inc_flags & INC_ISIPV6) { 2978 /* IPv6. */ 2979 ip6_sprintf(laddr_str, &inc->inc6_laddr); 2980 ip6_sprintf(faddr_str, &inc->inc6_faddr); 2981 } else 2982 #endif 2983 { 2984 /* IPv4. */ 2985 inet_ntoa_r(inc->inc_laddr, laddr_str); 2986 inet_ntoa_r(inc->inc_faddr, faddr_str); 2987 } 2988 db_print_indent(indent); 2989 db_printf("inc_laddr %s inc_lport %u\n", laddr_str, 2990 ntohs(inc->inc_lport)); 2991 db_print_indent(indent); 2992 db_printf("inc_faddr %s inc_fport %u\n", faddr_str, 2993 ntohs(inc->inc_fport)); 2994 } 2995 2996 static void 2997 db_print_inpflags(int inp_flags) 2998 { 2999 int comma; 3000 3001 comma = 0; 3002 if (inp_flags & INP_RECVOPTS) { 3003 db_printf("%sINP_RECVOPTS", comma ? ", " : ""); 3004 comma = 1; 3005 } 3006 if (inp_flags & INP_RECVRETOPTS) { 3007 db_printf("%sINP_RECVRETOPTS", comma ? ", " : ""); 3008 comma = 1; 3009 } 3010 if (inp_flags & INP_RECVDSTADDR) { 3011 db_printf("%sINP_RECVDSTADDR", comma ? ", " : ""); 3012 comma = 1; 3013 } 3014 if (inp_flags & INP_ORIGDSTADDR) { 3015 db_printf("%sINP_ORIGDSTADDR", comma ? ", " : ""); 3016 comma = 1; 3017 } 3018 if (inp_flags & INP_HDRINCL) { 3019 db_printf("%sINP_HDRINCL", comma ? ", " : ""); 3020 comma = 1; 3021 } 3022 if (inp_flags & INP_HIGHPORT) { 3023 db_printf("%sINP_HIGHPORT", comma ? ", " : ""); 3024 comma = 1; 3025 } 3026 if (inp_flags & INP_LOWPORT) { 3027 db_printf("%sINP_LOWPORT", comma ? ", " : ""); 3028 comma = 1; 3029 } 3030 if (inp_flags & INP_ANONPORT) { 3031 db_printf("%sINP_ANONPORT", comma ? ", " : ""); 3032 comma = 1; 3033 } 3034 if (inp_flags & INP_RECVIF) { 3035 db_printf("%sINP_RECVIF", comma ? ", " : ""); 3036 comma = 1; 3037 } 3038 if (inp_flags & INP_MTUDISC) { 3039 db_printf("%sINP_MTUDISC", comma ? ", " : ""); 3040 comma = 1; 3041 } 3042 if (inp_flags & INP_RECVTTL) { 3043 db_printf("%sINP_RECVTTL", comma ? ", " : ""); 3044 comma = 1; 3045 } 3046 if (inp_flags & INP_DONTFRAG) { 3047 db_printf("%sINP_DONTFRAG", comma ? ", " : ""); 3048 comma = 1; 3049 } 3050 if (inp_flags & INP_RECVTOS) { 3051 db_printf("%sINP_RECVTOS", comma ? ", " : ""); 3052 comma = 1; 3053 } 3054 if (inp_flags & IN6P_IPV6_V6ONLY) { 3055 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : ""); 3056 comma = 1; 3057 } 3058 if (inp_flags & IN6P_PKTINFO) { 3059 db_printf("%sIN6P_PKTINFO", comma ? ", " : ""); 3060 comma = 1; 3061 } 3062 if (inp_flags & IN6P_HOPLIMIT) { 3063 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : ""); 3064 comma = 1; 3065 } 3066 if (inp_flags & IN6P_HOPOPTS) { 3067 db_printf("%sIN6P_HOPOPTS", comma ? ", " : ""); 3068 comma = 1; 3069 } 3070 if (inp_flags & IN6P_DSTOPTS) { 3071 db_printf("%sIN6P_DSTOPTS", comma ? ", " : ""); 3072 comma = 1; 3073 } 3074 if (inp_flags & IN6P_RTHDR) { 3075 db_printf("%sIN6P_RTHDR", comma ? ", " : ""); 3076 comma = 1; 3077 } 3078 if (inp_flags & IN6P_RTHDRDSTOPTS) { 3079 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : ""); 3080 comma = 1; 3081 } 3082 if (inp_flags & IN6P_TCLASS) { 3083 db_printf("%sIN6P_TCLASS", comma ? ", " : ""); 3084 comma = 1; 3085 } 3086 if (inp_flags & IN6P_AUTOFLOWLABEL) { 3087 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : ""); 3088 comma = 1; 3089 } 3090 if (inp_flags & INP_TIMEWAIT) { 3091 db_printf("%sINP_TIMEWAIT", comma ? ", " : ""); 3092 comma = 1; 3093 } 3094 if (inp_flags & INP_ONESBCAST) { 3095 db_printf("%sINP_ONESBCAST", comma ? ", " : ""); 3096 comma = 1; 3097 } 3098 if (inp_flags & INP_DROPPED) { 3099 db_printf("%sINP_DROPPED", comma ? ", " : ""); 3100 comma = 1; 3101 } 3102 if (inp_flags & INP_SOCKREF) { 3103 db_printf("%sINP_SOCKREF", comma ? ", " : ""); 3104 comma = 1; 3105 } 3106 if (inp_flags & IN6P_RFC2292) { 3107 db_printf("%sIN6P_RFC2292", comma ? ", " : ""); 3108 comma = 1; 3109 } 3110 if (inp_flags & IN6P_MTU) { 3111 db_printf("IN6P_MTU%s", comma ? ", " : ""); 3112 comma = 1; 3113 } 3114 } 3115 3116 static void 3117 db_print_inpvflag(u_char inp_vflag) 3118 { 3119 int comma; 3120 3121 comma = 0; 3122 if (inp_vflag & INP_IPV4) { 3123 db_printf("%sINP_IPV4", comma ? ", " : ""); 3124 comma = 1; 3125 } 3126 if (inp_vflag & INP_IPV6) { 3127 db_printf("%sINP_IPV6", comma ? ", " : ""); 3128 comma = 1; 3129 } 3130 if (inp_vflag & INP_IPV6PROTO) { 3131 db_printf("%sINP_IPV6PROTO", comma ? ", " : ""); 3132 comma = 1; 3133 } 3134 } 3135 3136 static void 3137 db_print_inpcb(struct inpcb *inp, const char *name, int indent) 3138 { 3139 3140 db_print_indent(indent); 3141 db_printf("%s at %p\n", name, inp); 3142 3143 indent += 2; 3144 3145 db_print_indent(indent); 3146 db_printf("inp_flow: 0x%x\n", inp->inp_flow); 3147 3148 db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent); 3149 3150 db_print_indent(indent); 3151 db_printf("inp_ppcb: %p inp_pcbinfo: %p inp_socket: %p\n", 3152 inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket); 3153 3154 db_print_indent(indent); 3155 db_printf("inp_label: %p inp_flags: 0x%x (", 3156 inp->inp_label, inp->inp_flags); 3157 db_print_inpflags(inp->inp_flags); 3158 db_printf(")\n"); 3159 3160 db_print_indent(indent); 3161 db_printf("inp_sp: %p inp_vflag: 0x%x (", inp->inp_sp, 3162 inp->inp_vflag); 3163 db_print_inpvflag(inp->inp_vflag); 3164 db_printf(")\n"); 3165 3166 db_print_indent(indent); 3167 db_printf("inp_ip_ttl: %d inp_ip_p: %d inp_ip_minttl: %d\n", 3168 inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl); 3169 3170 db_print_indent(indent); 3171 #ifdef INET6 3172 if (inp->inp_vflag & INP_IPV6) { 3173 db_printf("in6p_options: %p in6p_outputopts: %p " 3174 "in6p_moptions: %p\n", inp->in6p_options, 3175 inp->in6p_outputopts, inp->in6p_moptions); 3176 db_printf("in6p_icmp6filt: %p in6p_cksum %d " 3177 "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum, 3178 inp->in6p_hops); 3179 } else 3180 #endif 3181 { 3182 db_printf("inp_ip_tos: %d inp_ip_options: %p " 3183 "inp_ip_moptions: %p\n", inp->inp_ip_tos, 3184 inp->inp_options, inp->inp_moptions); 3185 } 3186 3187 db_print_indent(indent); 3188 db_printf("inp_phd: %p inp_gencnt: %ju\n", inp->inp_phd, 3189 (uintmax_t)inp->inp_gencnt); 3190 } 3191 3192 DB_SHOW_COMMAND(inpcb, db_show_inpcb) 3193 { 3194 struct inpcb *inp; 3195 3196 if (!have_addr) { 3197 db_printf("usage: show inpcb <addr>\n"); 3198 return; 3199 } 3200 inp = (struct inpcb *)addr; 3201 3202 db_print_inpcb(inp, "inpcb", 0); 3203 } 3204 #endif /* DDB */ 3205 3206 #ifdef RATELIMIT 3207 /* 3208 * Modify TX rate limit based on the existing "inp->inp_snd_tag", 3209 * if any. 3210 */ 3211 int 3212 in_pcbmodify_txrtlmt(struct inpcb *inp, uint32_t max_pacing_rate) 3213 { 3214 union if_snd_tag_modify_params params = { 3215 .rate_limit.max_rate = max_pacing_rate, 3216 .rate_limit.flags = M_NOWAIT, 3217 }; 3218 struct m_snd_tag *mst; 3219 struct ifnet *ifp; 3220 int error; 3221 3222 mst = inp->inp_snd_tag; 3223 if (mst == NULL) 3224 return (EINVAL); 3225 3226 ifp = mst->ifp; 3227 if (ifp == NULL) 3228 return (EINVAL); 3229 3230 if (ifp->if_snd_tag_modify == NULL) { 3231 error = EOPNOTSUPP; 3232 } else { 3233 error = ifp->if_snd_tag_modify(mst, ¶ms); 3234 } 3235 return (error); 3236 } 3237 3238 /* 3239 * Query existing TX rate limit based on the existing 3240 * "inp->inp_snd_tag", if any. 3241 */ 3242 int 3243 in_pcbquery_txrtlmt(struct inpcb *inp, uint32_t *p_max_pacing_rate) 3244 { 3245 union if_snd_tag_query_params params = { }; 3246 struct m_snd_tag *mst; 3247 struct ifnet *ifp; 3248 int error; 3249 3250 mst = inp->inp_snd_tag; 3251 if (mst == NULL) 3252 return (EINVAL); 3253 3254 ifp = mst->ifp; 3255 if (ifp == NULL) 3256 return (EINVAL); 3257 3258 if (ifp->if_snd_tag_query == NULL) { 3259 error = EOPNOTSUPP; 3260 } else { 3261 error = ifp->if_snd_tag_query(mst, ¶ms); 3262 if (error == 0 && p_max_pacing_rate != NULL) 3263 *p_max_pacing_rate = params.rate_limit.max_rate; 3264 } 3265 return (error); 3266 } 3267 3268 /* 3269 * Query existing TX queue level based on the existing 3270 * "inp->inp_snd_tag", if any. 3271 */ 3272 int 3273 in_pcbquery_txrlevel(struct inpcb *inp, uint32_t *p_txqueue_level) 3274 { 3275 union if_snd_tag_query_params params = { }; 3276 struct m_snd_tag *mst; 3277 struct ifnet *ifp; 3278 int error; 3279 3280 mst = inp->inp_snd_tag; 3281 if (mst == NULL) 3282 return (EINVAL); 3283 3284 ifp = mst->ifp; 3285 if (ifp == NULL) 3286 return (EINVAL); 3287 3288 if (ifp->if_snd_tag_query == NULL) 3289 return (EOPNOTSUPP); 3290 3291 error = ifp->if_snd_tag_query(mst, ¶ms); 3292 if (error == 0 && p_txqueue_level != NULL) 3293 *p_txqueue_level = params.rate_limit.queue_level; 3294 return (error); 3295 } 3296 3297 /* 3298 * Allocate a new TX rate limit send tag from the network interface 3299 * given by the "ifp" argument and save it in "inp->inp_snd_tag": 3300 */ 3301 int 3302 in_pcbattach_txrtlmt(struct inpcb *inp, struct ifnet *ifp, 3303 uint32_t flowtype, uint32_t flowid, uint32_t max_pacing_rate, struct m_snd_tag **st) 3304 3305 { 3306 union if_snd_tag_alloc_params params = { 3307 .rate_limit.hdr.type = (max_pacing_rate == -1U) ? 3308 IF_SND_TAG_TYPE_UNLIMITED : IF_SND_TAG_TYPE_RATE_LIMIT, 3309 .rate_limit.hdr.flowid = flowid, 3310 .rate_limit.hdr.flowtype = flowtype, 3311 .rate_limit.hdr.numa_domain = inp->inp_numa_domain, 3312 .rate_limit.max_rate = max_pacing_rate, 3313 .rate_limit.flags = M_NOWAIT, 3314 }; 3315 int error; 3316 3317 INP_WLOCK_ASSERT(inp); 3318 3319 if (*st != NULL) 3320 return (EINVAL); 3321 3322 if (ifp->if_snd_tag_alloc == NULL) { 3323 error = EOPNOTSUPP; 3324 } else { 3325 error = ifp->if_snd_tag_alloc(ifp, ¶ms, &inp->inp_snd_tag); 3326 3327 #ifdef INET 3328 if (error == 0) { 3329 counter_u64_add(rate_limit_set_ok, 1); 3330 counter_u64_add(rate_limit_active, 1); 3331 } else 3332 counter_u64_add(rate_limit_alloc_fail, 1); 3333 #endif 3334 } 3335 return (error); 3336 } 3337 3338 void 3339 in_pcbdetach_tag(struct ifnet *ifp, struct m_snd_tag *mst) 3340 { 3341 if (ifp == NULL) 3342 return; 3343 3344 /* 3345 * If the device was detached while we still had reference(s) 3346 * on the ifp, we assume if_snd_tag_free() was replaced with 3347 * stubs. 3348 */ 3349 ifp->if_snd_tag_free(mst); 3350 3351 /* release reference count on network interface */ 3352 if_rele(ifp); 3353 #ifdef INET 3354 counter_u64_add(rate_limit_active, -1); 3355 #endif 3356 } 3357 3358 /* 3359 * Free an existing TX rate limit tag based on the "inp->inp_snd_tag", 3360 * if any: 3361 */ 3362 void 3363 in_pcbdetach_txrtlmt(struct inpcb *inp) 3364 { 3365 struct m_snd_tag *mst; 3366 3367 INP_WLOCK_ASSERT(inp); 3368 3369 mst = inp->inp_snd_tag; 3370 inp->inp_snd_tag = NULL; 3371 3372 if (mst == NULL) 3373 return; 3374 3375 m_snd_tag_rele(mst); 3376 } 3377 3378 int 3379 in_pcboutput_txrtlmt_locked(struct inpcb *inp, struct ifnet *ifp, struct mbuf *mb, uint32_t max_pacing_rate) 3380 { 3381 int error; 3382 3383 /* 3384 * If the existing send tag is for the wrong interface due to 3385 * a route change, first drop the existing tag. Set the 3386 * CHANGED flag so that we will keep trying to allocate a new 3387 * tag if we fail to allocate one this time. 3388 */ 3389 if (inp->inp_snd_tag != NULL && inp->inp_snd_tag->ifp != ifp) { 3390 in_pcbdetach_txrtlmt(inp); 3391 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 3392 } 3393 3394 /* 3395 * NOTE: When attaching to a network interface a reference is 3396 * made to ensure the network interface doesn't go away until 3397 * all ratelimit connections are gone. The network interface 3398 * pointers compared below represent valid network interfaces, 3399 * except when comparing towards NULL. 3400 */ 3401 if (max_pacing_rate == 0 && inp->inp_snd_tag == NULL) { 3402 error = 0; 3403 } else if (!(ifp->if_capenable & IFCAP_TXRTLMT)) { 3404 if (inp->inp_snd_tag != NULL) 3405 in_pcbdetach_txrtlmt(inp); 3406 error = 0; 3407 } else if (inp->inp_snd_tag == NULL) { 3408 /* 3409 * In order to utilize packet pacing with RSS, we need 3410 * to wait until there is a valid RSS hash before we 3411 * can proceed: 3412 */ 3413 if (M_HASHTYPE_GET(mb) == M_HASHTYPE_NONE) { 3414 error = EAGAIN; 3415 } else { 3416 error = in_pcbattach_txrtlmt(inp, ifp, M_HASHTYPE_GET(mb), 3417 mb->m_pkthdr.flowid, max_pacing_rate, &inp->inp_snd_tag); 3418 } 3419 } else { 3420 error = in_pcbmodify_txrtlmt(inp, max_pacing_rate); 3421 } 3422 if (error == 0 || error == EOPNOTSUPP) 3423 inp->inp_flags2 &= ~INP_RATE_LIMIT_CHANGED; 3424 3425 return (error); 3426 } 3427 3428 /* 3429 * This function should be called when the INP_RATE_LIMIT_CHANGED flag 3430 * is set in the fast path and will attach/detach/modify the TX rate 3431 * limit send tag based on the socket's so_max_pacing_rate value. 3432 */ 3433 void 3434 in_pcboutput_txrtlmt(struct inpcb *inp, struct ifnet *ifp, struct mbuf *mb) 3435 { 3436 struct socket *socket; 3437 uint32_t max_pacing_rate; 3438 bool did_upgrade; 3439 int error; 3440 3441 if (inp == NULL) 3442 return; 3443 3444 socket = inp->inp_socket; 3445 if (socket == NULL) 3446 return; 3447 3448 if (!INP_WLOCKED(inp)) { 3449 /* 3450 * NOTE: If the write locking fails, we need to bail 3451 * out and use the non-ratelimited ring for the 3452 * transmit until there is a new chance to get the 3453 * write lock. 3454 */ 3455 if (!INP_TRY_UPGRADE(inp)) 3456 return; 3457 did_upgrade = 1; 3458 } else { 3459 did_upgrade = 0; 3460 } 3461 3462 /* 3463 * NOTE: The so_max_pacing_rate value is read unlocked, 3464 * because atomic updates are not required since the variable 3465 * is checked at every mbuf we send. It is assumed that the 3466 * variable read itself will be atomic. 3467 */ 3468 max_pacing_rate = socket->so_max_pacing_rate; 3469 3470 error = in_pcboutput_txrtlmt_locked(inp, ifp, mb, max_pacing_rate); 3471 3472 if (did_upgrade) 3473 INP_DOWNGRADE(inp); 3474 } 3475 3476 /* 3477 * Track route changes for TX rate limiting. 3478 */ 3479 void 3480 in_pcboutput_eagain(struct inpcb *inp) 3481 { 3482 bool did_upgrade; 3483 3484 if (inp == NULL) 3485 return; 3486 3487 if (inp->inp_snd_tag == NULL) 3488 return; 3489 3490 if (!INP_WLOCKED(inp)) { 3491 /* 3492 * NOTE: If the write locking fails, we need to bail 3493 * out and use the non-ratelimited ring for the 3494 * transmit until there is a new chance to get the 3495 * write lock. 3496 */ 3497 if (!INP_TRY_UPGRADE(inp)) 3498 return; 3499 did_upgrade = 1; 3500 } else { 3501 did_upgrade = 0; 3502 } 3503 3504 /* detach rate limiting */ 3505 in_pcbdetach_txrtlmt(inp); 3506 3507 /* make sure new mbuf send tag allocation is made */ 3508 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 3509 3510 if (did_upgrade) 3511 INP_DOWNGRADE(inp); 3512 } 3513 3514 #ifdef INET 3515 static void 3516 rl_init(void *st) 3517 { 3518 rate_limit_active = counter_u64_alloc(M_WAITOK); 3519 rate_limit_alloc_fail = counter_u64_alloc(M_WAITOK); 3520 rate_limit_set_ok = counter_u64_alloc(M_WAITOK); 3521 } 3522 3523 SYSINIT(rl, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, rl_init, NULL); 3524 #endif 3525 #endif /* RATELIMIT */ 3526