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 * Copyright (c) 2021-2022 Gleb Smirnoff <glebius@FreeBSD.org> 9 * All rights reserved. 10 * 11 * Portions of this software were developed by Robert N. M. Watson under 12 * contract to Juniper Networks, Inc. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #include "opt_ddb.h" 41 #include "opt_ipsec.h" 42 #include "opt_inet.h" 43 #include "opt_inet6.h" 44 #include "opt_ratelimit.h" 45 #include "opt_route.h" 46 #include "opt_rss.h" 47 48 #include <sys/param.h> 49 #include <sys/hash.h> 50 #include <sys/systm.h> 51 #include <sys/libkern.h> 52 #include <sys/lock.h> 53 #include <sys/malloc.h> 54 #include <sys/mbuf.h> 55 #include <sys/eventhandler.h> 56 #include <sys/domain.h> 57 #include <sys/proc.h> 58 #include <sys/protosw.h> 59 #include <sys/smp.h> 60 #include <sys/smr.h> 61 #include <sys/socket.h> 62 #include <sys/socketvar.h> 63 #include <sys/sockio.h> 64 #include <sys/priv.h> 65 #include <sys/proc.h> 66 #include <sys/refcount.h> 67 #include <sys/jail.h> 68 #include <sys/kernel.h> 69 #include <sys/sysctl.h> 70 71 #ifdef DDB 72 #include <ddb/ddb.h> 73 #endif 74 75 #include <vm/uma.h> 76 #include <vm/vm.h> 77 78 #include <net/if.h> 79 #include <net/if_var.h> 80 #include <net/if_private.h> 81 #include <net/if_types.h> 82 #include <net/if_llatbl.h> 83 #include <net/route.h> 84 #include <net/rss_config.h> 85 #include <net/vnet.h> 86 87 #if defined(INET) || defined(INET6) 88 #include <netinet/in.h> 89 #include <netinet/in_pcb.h> 90 #include <netinet/in_pcb_var.h> 91 #include <netinet/tcp.h> 92 #ifdef INET 93 #include <netinet/in_var.h> 94 #include <netinet/in_fib.h> 95 #endif 96 #include <netinet/ip_var.h> 97 #ifdef INET6 98 #include <netinet/ip6.h> 99 #include <netinet6/in6_pcb.h> 100 #include <netinet6/in6_var.h> 101 #include <netinet6/ip6_var.h> 102 #endif /* INET6 */ 103 #include <net/route/nhop.h> 104 #endif 105 106 #include <netipsec/ipsec_support.h> 107 108 #include <security/mac/mac_framework.h> 109 110 #define INPCBLBGROUP_SIZMIN 8 111 #define INPCBLBGROUP_SIZMAX 256 112 113 #define INP_FREED 0x00000200 /* Went through in_pcbfree(). */ 114 #define INP_INLBGROUP 0x01000000 /* Inserted into inpcblbgroup. */ 115 116 /* 117 * These configure the range of local port addresses assigned to 118 * "unspecified" outgoing connections/packets/whatever. 119 */ 120 VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1; /* 1023 */ 121 VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART; /* 600 */ 122 VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST; /* 10000 */ 123 VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST; /* 65535 */ 124 VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO; /* 49152 */ 125 VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO; /* 65535 */ 126 127 /* 128 * Reserved ports accessible only to root. There are significant 129 * security considerations that must be accounted for when changing these, 130 * but the security benefits can be great. Please be careful. 131 */ 132 VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1; /* 1023 */ 133 VNET_DEFINE(int, ipport_reservedlow); 134 135 /* Enable random ephemeral port allocation by default. */ 136 VNET_DEFINE(int, ipport_randomized) = 1; 137 138 #ifdef INET 139 static struct inpcb *in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, 140 struct in_addr faddr, u_int fport_arg, 141 struct in_addr laddr, u_int lport_arg, 142 int lookupflags, uint8_t numa_domain); 143 144 #define RANGECHK(var, min, max) \ 145 if ((var) < (min)) { (var) = (min); } \ 146 else if ((var) > (max)) { (var) = (max); } 147 148 static int 149 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS) 150 { 151 int error; 152 153 error = sysctl_handle_int(oidp, arg1, arg2, req); 154 if (error == 0) { 155 RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1); 156 RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1); 157 RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX); 158 RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX); 159 RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX); 160 RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX); 161 } 162 return (error); 163 } 164 165 #undef RANGECHK 166 167 static SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, 168 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 169 "IP Ports"); 170 171 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, 172 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 173 &VNET_NAME(ipport_lowfirstauto), 0, &sysctl_net_ipport_check, "I", 174 ""); 175 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, 176 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 177 &VNET_NAME(ipport_lowlastauto), 0, &sysctl_net_ipport_check, "I", 178 ""); 179 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, 180 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 181 &VNET_NAME(ipport_firstauto), 0, &sysctl_net_ipport_check, "I", 182 ""); 183 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, 184 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 185 &VNET_NAME(ipport_lastauto), 0, &sysctl_net_ipport_check, "I", 186 ""); 187 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, 188 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 189 &VNET_NAME(ipport_hifirstauto), 0, &sysctl_net_ipport_check, "I", 190 ""); 191 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, 192 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 193 &VNET_NAME(ipport_hilastauto), 0, &sysctl_net_ipport_check, "I", 194 ""); 195 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh, 196 CTLFLAG_VNET | CTLFLAG_RW | CTLFLAG_SECURE, 197 &VNET_NAME(ipport_reservedhigh), 0, ""); 198 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow, 199 CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, ""); 200 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomized, 201 CTLFLAG_VNET | CTLFLAG_RW, 202 &VNET_NAME(ipport_randomized), 0, "Enable random port allocation"); 203 204 #ifdef RATELIMIT 205 counter_u64_t rate_limit_new; 206 counter_u64_t rate_limit_chg; 207 counter_u64_t rate_limit_active; 208 counter_u64_t rate_limit_alloc_fail; 209 counter_u64_t rate_limit_set_ok; 210 211 static SYSCTL_NODE(_net_inet_ip, OID_AUTO, rl, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 212 "IP Rate Limiting"); 213 SYSCTL_COUNTER_U64(_net_inet_ip_rl, OID_AUTO, active, CTLFLAG_RD, 214 &rate_limit_active, "Active rate limited connections"); 215 SYSCTL_COUNTER_U64(_net_inet_ip_rl, OID_AUTO, alloc_fail, CTLFLAG_RD, 216 &rate_limit_alloc_fail, "Rate limited connection failures"); 217 SYSCTL_COUNTER_U64(_net_inet_ip_rl, OID_AUTO, set_ok, CTLFLAG_RD, 218 &rate_limit_set_ok, "Rate limited setting succeeded"); 219 SYSCTL_COUNTER_U64(_net_inet_ip_rl, OID_AUTO, newrl, CTLFLAG_RD, 220 &rate_limit_new, "Total Rate limit new attempts"); 221 SYSCTL_COUNTER_U64(_net_inet_ip_rl, OID_AUTO, chgrl, CTLFLAG_RD, 222 &rate_limit_chg, "Total Rate limited change attempts"); 223 #endif /* RATELIMIT */ 224 225 #endif /* INET */ 226 227 VNET_DEFINE(uint32_t, in_pcbhashseed); 228 static void 229 in_pcbhashseed_init(void) 230 { 231 232 V_in_pcbhashseed = arc4random(); 233 } 234 VNET_SYSINIT(in_pcbhashseed_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, 235 in_pcbhashseed_init, 0); 236 237 #ifdef INET 238 VNET_DEFINE_STATIC(int, connect_inaddr_wild) = 1; 239 #define V_connect_inaddr_wild VNET(connect_inaddr_wild) 240 SYSCTL_INT(_net_inet_ip, OID_AUTO, connect_inaddr_wild, 241 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(connect_inaddr_wild), 0, 242 "Allow connecting to INADDR_ANY or INADDR_BROADCAST for connect(2)"); 243 #endif 244 245 static void in_pcbremhash(struct inpcb *); 246 247 /* 248 * in_pcb.c: manage the Protocol Control Blocks. 249 * 250 * NOTE: It is assumed that most of these functions will be called with 251 * the pcbinfo lock held, and often, the inpcb lock held, as these utility 252 * functions often modify hash chains or addresses in pcbs. 253 */ 254 255 static struct inpcblbgroup * 256 in_pcblbgroup_alloc(struct inpcblbgrouphead *hdr, struct ucred *cred, 257 u_char vflag, uint16_t port, const union in_dependaddr *addr, int size, 258 uint8_t numa_domain) 259 { 260 struct inpcblbgroup *grp; 261 size_t bytes; 262 263 bytes = __offsetof(struct inpcblbgroup, il_inp[size]); 264 grp = malloc(bytes, M_PCB, M_ZERO | M_NOWAIT); 265 if (grp == NULL) 266 return (NULL); 267 grp->il_cred = crhold(cred); 268 grp->il_vflag = vflag; 269 grp->il_lport = port; 270 grp->il_numa_domain = numa_domain; 271 grp->il_dependladdr = *addr; 272 grp->il_inpsiz = size; 273 CK_LIST_INSERT_HEAD(hdr, grp, il_list); 274 return (grp); 275 } 276 277 static void 278 in_pcblbgroup_free_deferred(epoch_context_t ctx) 279 { 280 struct inpcblbgroup *grp; 281 282 grp = __containerof(ctx, struct inpcblbgroup, il_epoch_ctx); 283 crfree(grp->il_cred); 284 free(grp, M_PCB); 285 } 286 287 static void 288 in_pcblbgroup_free(struct inpcblbgroup *grp) 289 { 290 291 CK_LIST_REMOVE(grp, il_list); 292 NET_EPOCH_CALL(in_pcblbgroup_free_deferred, &grp->il_epoch_ctx); 293 } 294 295 static struct inpcblbgroup * 296 in_pcblbgroup_resize(struct inpcblbgrouphead *hdr, 297 struct inpcblbgroup *old_grp, int size) 298 { 299 struct inpcblbgroup *grp; 300 int i; 301 302 grp = in_pcblbgroup_alloc(hdr, old_grp->il_cred, old_grp->il_vflag, 303 old_grp->il_lport, &old_grp->il_dependladdr, size, 304 old_grp->il_numa_domain); 305 if (grp == NULL) 306 return (NULL); 307 308 KASSERT(old_grp->il_inpcnt < grp->il_inpsiz, 309 ("invalid new local group size %d and old local group count %d", 310 grp->il_inpsiz, old_grp->il_inpcnt)); 311 312 for (i = 0; i < old_grp->il_inpcnt; ++i) 313 grp->il_inp[i] = old_grp->il_inp[i]; 314 grp->il_inpcnt = old_grp->il_inpcnt; 315 in_pcblbgroup_free(old_grp); 316 return (grp); 317 } 318 319 /* 320 * PCB at index 'i' is removed from the group. Pull up the ones below il_inp[i] 321 * and shrink group if possible. 322 */ 323 static void 324 in_pcblbgroup_reorder(struct inpcblbgrouphead *hdr, struct inpcblbgroup **grpp, 325 int i) 326 { 327 struct inpcblbgroup *grp, *new_grp; 328 329 grp = *grpp; 330 for (; i + 1 < grp->il_inpcnt; ++i) 331 grp->il_inp[i] = grp->il_inp[i + 1]; 332 grp->il_inpcnt--; 333 334 if (grp->il_inpsiz > INPCBLBGROUP_SIZMIN && 335 grp->il_inpcnt <= grp->il_inpsiz / 4) { 336 /* Shrink this group. */ 337 new_grp = in_pcblbgroup_resize(hdr, grp, grp->il_inpsiz / 2); 338 if (new_grp != NULL) 339 *grpp = new_grp; 340 } 341 } 342 343 /* 344 * Add PCB to load balance group for SO_REUSEPORT_LB option. 345 */ 346 static int 347 in_pcbinslbgrouphash(struct inpcb *inp, uint8_t numa_domain) 348 { 349 const static struct timeval interval = { 60, 0 }; 350 static struct timeval lastprint; 351 struct inpcbinfo *pcbinfo; 352 struct inpcblbgrouphead *hdr; 353 struct inpcblbgroup *grp; 354 uint32_t idx; 355 356 pcbinfo = inp->inp_pcbinfo; 357 358 INP_WLOCK_ASSERT(inp); 359 INP_HASH_WLOCK_ASSERT(pcbinfo); 360 361 #ifdef INET6 362 /* 363 * Don't allow IPv4 mapped INET6 wild socket. 364 */ 365 if ((inp->inp_vflag & INP_IPV4) && 366 inp->inp_laddr.s_addr == INADDR_ANY && 367 INP_CHECK_SOCKAF(inp->inp_socket, AF_INET6)) { 368 return (0); 369 } 370 #endif 371 372 idx = INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_lbgrouphashmask); 373 hdr = &pcbinfo->ipi_lbgrouphashbase[idx]; 374 CK_LIST_FOREACH(grp, hdr, il_list) { 375 if (grp->il_cred->cr_prison == inp->inp_cred->cr_prison && 376 grp->il_vflag == inp->inp_vflag && 377 grp->il_lport == inp->inp_lport && 378 grp->il_numa_domain == numa_domain && 379 memcmp(&grp->il_dependladdr, 380 &inp->inp_inc.inc_ie.ie_dependladdr, 381 sizeof(grp->il_dependladdr)) == 0) { 382 break; 383 } 384 } 385 if (grp == NULL) { 386 /* Create new load balance group. */ 387 grp = in_pcblbgroup_alloc(hdr, inp->inp_cred, inp->inp_vflag, 388 inp->inp_lport, &inp->inp_inc.inc_ie.ie_dependladdr, 389 INPCBLBGROUP_SIZMIN, numa_domain); 390 if (grp == NULL) 391 return (ENOBUFS); 392 } else if (grp->il_inpcnt == grp->il_inpsiz) { 393 if (grp->il_inpsiz >= INPCBLBGROUP_SIZMAX) { 394 if (ratecheck(&lastprint, &interval)) 395 printf("lb group port %d, limit reached\n", 396 ntohs(grp->il_lport)); 397 return (0); 398 } 399 400 /* Expand this local group. */ 401 grp = in_pcblbgroup_resize(hdr, grp, grp->il_inpsiz * 2); 402 if (grp == NULL) 403 return (ENOBUFS); 404 } 405 406 KASSERT(grp->il_inpcnt < grp->il_inpsiz, 407 ("invalid local group size %d and count %d", grp->il_inpsiz, 408 grp->il_inpcnt)); 409 410 grp->il_inp[grp->il_inpcnt] = inp; 411 grp->il_inpcnt++; 412 inp->inp_flags |= INP_INLBGROUP; 413 return (0); 414 } 415 416 /* 417 * Remove PCB from load balance group. 418 */ 419 static void 420 in_pcbremlbgrouphash(struct inpcb *inp) 421 { 422 struct inpcbinfo *pcbinfo; 423 struct inpcblbgrouphead *hdr; 424 struct inpcblbgroup *grp; 425 int i; 426 427 pcbinfo = inp->inp_pcbinfo; 428 429 INP_WLOCK_ASSERT(inp); 430 MPASS(inp->inp_flags & INP_INLBGROUP); 431 INP_HASH_WLOCK_ASSERT(pcbinfo); 432 433 hdr = &pcbinfo->ipi_lbgrouphashbase[ 434 INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_lbgrouphashmask)]; 435 CK_LIST_FOREACH(grp, hdr, il_list) { 436 for (i = 0; i < grp->il_inpcnt; ++i) { 437 if (grp->il_inp[i] != inp) 438 continue; 439 440 if (grp->il_inpcnt == 1) { 441 /* We are the last, free this local group. */ 442 in_pcblbgroup_free(grp); 443 } else { 444 /* Pull up inpcbs, shrink group if possible. */ 445 in_pcblbgroup_reorder(hdr, &grp, i); 446 } 447 inp->inp_flags &= ~INP_INLBGROUP; 448 return; 449 } 450 } 451 KASSERT(0, ("%s: did not find %p", __func__, inp)); 452 } 453 454 int 455 in_pcblbgroup_numa(struct inpcb *inp, int arg) 456 { 457 struct inpcbinfo *pcbinfo; 458 struct inpcblbgrouphead *hdr; 459 struct inpcblbgroup *grp; 460 int err, i; 461 uint8_t numa_domain; 462 463 switch (arg) { 464 case TCP_REUSPORT_LB_NUMA_NODOM: 465 numa_domain = M_NODOM; 466 break; 467 case TCP_REUSPORT_LB_NUMA_CURDOM: 468 numa_domain = PCPU_GET(domain); 469 break; 470 default: 471 if (arg < 0 || arg >= vm_ndomains) 472 return (EINVAL); 473 numa_domain = arg; 474 } 475 476 err = 0; 477 pcbinfo = inp->inp_pcbinfo; 478 INP_WLOCK_ASSERT(inp); 479 INP_HASH_WLOCK(pcbinfo); 480 hdr = &pcbinfo->ipi_lbgrouphashbase[ 481 INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_lbgrouphashmask)]; 482 CK_LIST_FOREACH(grp, hdr, il_list) { 483 for (i = 0; i < grp->il_inpcnt; ++i) { 484 if (grp->il_inp[i] != inp) 485 continue; 486 487 if (grp->il_numa_domain == numa_domain) { 488 goto abort_with_hash_wlock; 489 } 490 491 /* Remove it from the old group. */ 492 in_pcbremlbgrouphash(inp); 493 494 /* Add it to the new group based on numa domain. */ 495 in_pcbinslbgrouphash(inp, numa_domain); 496 goto abort_with_hash_wlock; 497 } 498 } 499 err = ENOENT; 500 abort_with_hash_wlock: 501 INP_HASH_WUNLOCK(pcbinfo); 502 return (err); 503 } 504 505 /* Make sure it is safe to use hashinit(9) on CK_LIST. */ 506 CTASSERT(sizeof(struct inpcbhead) == sizeof(LIST_HEAD(, inpcb))); 507 508 /* 509 * Initialize an inpcbinfo - a per-VNET instance of connections db. 510 */ 511 void 512 in_pcbinfo_init(struct inpcbinfo *pcbinfo, struct inpcbstorage *pcbstor, 513 u_int hash_nelements, u_int porthash_nelements) 514 { 515 516 mtx_init(&pcbinfo->ipi_lock, pcbstor->ips_infolock_name, NULL, MTX_DEF); 517 mtx_init(&pcbinfo->ipi_hash_lock, pcbstor->ips_hashlock_name, 518 NULL, MTX_DEF); 519 #ifdef VIMAGE 520 pcbinfo->ipi_vnet = curvnet; 521 #endif 522 CK_LIST_INIT(&pcbinfo->ipi_listhead); 523 pcbinfo->ipi_count = 0; 524 pcbinfo->ipi_hash_exact = hashinit(hash_nelements, M_PCB, 525 &pcbinfo->ipi_hashmask); 526 pcbinfo->ipi_hash_wild = hashinit(hash_nelements, M_PCB, 527 &pcbinfo->ipi_hashmask); 528 porthash_nelements = imin(porthash_nelements, IPPORT_MAX + 1); 529 pcbinfo->ipi_porthashbase = hashinit(porthash_nelements, M_PCB, 530 &pcbinfo->ipi_porthashmask); 531 pcbinfo->ipi_lbgrouphashbase = hashinit(porthash_nelements, M_PCB, 532 &pcbinfo->ipi_lbgrouphashmask); 533 pcbinfo->ipi_zone = pcbstor->ips_zone; 534 pcbinfo->ipi_portzone = pcbstor->ips_portzone; 535 pcbinfo->ipi_smr = uma_zone_get_smr(pcbinfo->ipi_zone); 536 } 537 538 /* 539 * Destroy an inpcbinfo. 540 */ 541 void 542 in_pcbinfo_destroy(struct inpcbinfo *pcbinfo) 543 { 544 545 KASSERT(pcbinfo->ipi_count == 0, 546 ("%s: ipi_count = %u", __func__, pcbinfo->ipi_count)); 547 548 hashdestroy(pcbinfo->ipi_hash_exact, M_PCB, pcbinfo->ipi_hashmask); 549 hashdestroy(pcbinfo->ipi_hash_wild, M_PCB, pcbinfo->ipi_hashmask); 550 hashdestroy(pcbinfo->ipi_porthashbase, M_PCB, 551 pcbinfo->ipi_porthashmask); 552 hashdestroy(pcbinfo->ipi_lbgrouphashbase, M_PCB, 553 pcbinfo->ipi_lbgrouphashmask); 554 mtx_destroy(&pcbinfo->ipi_hash_lock); 555 mtx_destroy(&pcbinfo->ipi_lock); 556 } 557 558 /* 559 * Initialize a pcbstorage - per protocol zones to allocate inpcbs. 560 */ 561 static void inpcb_fini(void *, int); 562 void 563 in_pcbstorage_init(void *arg) 564 { 565 struct inpcbstorage *pcbstor = arg; 566 567 pcbstor->ips_zone = uma_zcreate(pcbstor->ips_zone_name, 568 pcbstor->ips_size, NULL, NULL, pcbstor->ips_pcbinit, 569 inpcb_fini, UMA_ALIGN_CACHE, UMA_ZONE_SMR); 570 pcbstor->ips_portzone = uma_zcreate(pcbstor->ips_portzone_name, 571 sizeof(struct inpcbport), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 572 uma_zone_set_smr(pcbstor->ips_portzone, 573 uma_zone_get_smr(pcbstor->ips_zone)); 574 } 575 576 /* 577 * Destroy a pcbstorage - used by unloadable protocols. 578 */ 579 void 580 in_pcbstorage_destroy(void *arg) 581 { 582 struct inpcbstorage *pcbstor = arg; 583 584 uma_zdestroy(pcbstor->ips_zone); 585 uma_zdestroy(pcbstor->ips_portzone); 586 } 587 588 /* 589 * Allocate a PCB and associate it with the socket. 590 * On success return with the PCB locked. 591 */ 592 int 593 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo) 594 { 595 struct inpcb *inp; 596 #if defined(IPSEC) || defined(IPSEC_SUPPORT) || defined(MAC) 597 int error; 598 #endif 599 600 inp = uma_zalloc_smr(pcbinfo->ipi_zone, M_NOWAIT); 601 if (inp == NULL) 602 return (ENOBUFS); 603 bzero(&inp->inp_start_zero, inp_zero_size); 604 #ifdef NUMA 605 inp->inp_numa_domain = M_NODOM; 606 #endif 607 inp->inp_pcbinfo = pcbinfo; 608 inp->inp_socket = so; 609 inp->inp_cred = crhold(so->so_cred); 610 inp->inp_inc.inc_fibnum = so->so_fibnum; 611 #ifdef MAC 612 error = mac_inpcb_init(inp, M_NOWAIT); 613 if (error != 0) 614 goto out; 615 mac_inpcb_create(so, inp); 616 #endif 617 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 618 error = ipsec_init_pcbpolicy(inp); 619 if (error != 0) { 620 #ifdef MAC 621 mac_inpcb_destroy(inp); 622 #endif 623 goto out; 624 } 625 #endif /*IPSEC*/ 626 #ifdef INET6 627 if (INP_SOCKAF(so) == AF_INET6) { 628 inp->inp_vflag |= INP_IPV6PROTO | INP_IPV6; 629 if (V_ip6_v6only) 630 inp->inp_flags |= IN6P_IPV6_V6ONLY; 631 #ifdef INET 632 else 633 inp->inp_vflag |= INP_IPV4; 634 #endif 635 if (V_ip6_auto_flowlabel) 636 inp->inp_flags |= IN6P_AUTOFLOWLABEL; 637 inp->in6p_hops = -1; /* use kernel default */ 638 } 639 #endif 640 #if defined(INET) && defined(INET6) 641 else 642 #endif 643 #ifdef INET 644 inp->inp_vflag |= INP_IPV4; 645 #endif 646 inp->inp_smr = SMR_SEQ_INVALID; 647 648 /* 649 * Routes in inpcb's can cache L2 as well; they are guaranteed 650 * to be cleaned up. 651 */ 652 inp->inp_route.ro_flags = RT_LLE_CACHE; 653 refcount_init(&inp->inp_refcount, 1); /* Reference from socket. */ 654 INP_WLOCK(inp); 655 INP_INFO_WLOCK(pcbinfo); 656 pcbinfo->ipi_count++; 657 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 658 CK_LIST_INSERT_HEAD(&pcbinfo->ipi_listhead, inp, inp_list); 659 INP_INFO_WUNLOCK(pcbinfo); 660 so->so_pcb = inp; 661 662 return (0); 663 664 #if defined(IPSEC) || defined(IPSEC_SUPPORT) || defined(MAC) 665 out: 666 crfree(inp->inp_cred); 667 #ifdef INVARIANTS 668 inp->inp_cred = NULL; 669 #endif 670 uma_zfree_smr(pcbinfo->ipi_zone, inp); 671 return (error); 672 #endif 673 } 674 675 #ifdef INET 676 int 677 in_pcbbind(struct inpcb *inp, struct sockaddr_in *sin, struct ucred *cred) 678 { 679 int anonport, error; 680 681 KASSERT(sin == NULL || sin->sin_family == AF_INET, 682 ("%s: invalid address family for %p", __func__, sin)); 683 KASSERT(sin == NULL || sin->sin_len == sizeof(struct sockaddr_in), 684 ("%s: invalid address length for %p", __func__, sin)); 685 INP_WLOCK_ASSERT(inp); 686 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 687 688 if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY) 689 return (EINVAL); 690 anonport = sin == NULL || sin->sin_port == 0; 691 error = in_pcbbind_setup(inp, sin, &inp->inp_laddr.s_addr, 692 &inp->inp_lport, cred); 693 if (error) 694 return (error); 695 if (in_pcbinshash(inp) != 0) { 696 inp->inp_laddr.s_addr = INADDR_ANY; 697 inp->inp_lport = 0; 698 return (EAGAIN); 699 } 700 if (anonport) 701 inp->inp_flags |= INP_ANONPORT; 702 return (0); 703 } 704 #endif 705 706 #if defined(INET) || defined(INET6) 707 /* 708 * Assign a local port like in_pcb_lport(), but also used with connect() 709 * and a foreign address and port. If fsa is non-NULL, choose a local port 710 * that is unused with those, otherwise one that is completely unused. 711 * lsa can be NULL for IPv6. 712 */ 713 int 714 in_pcb_lport_dest(struct inpcb *inp, struct sockaddr *lsa, u_short *lportp, 715 struct sockaddr *fsa, u_short fport, struct ucred *cred, int lookupflags) 716 { 717 struct inpcbinfo *pcbinfo; 718 struct inpcb *tmpinp; 719 unsigned short *lastport; 720 int count, error; 721 u_short aux, first, last, lport; 722 #ifdef INET 723 struct in_addr laddr, faddr; 724 #endif 725 #ifdef INET6 726 struct in6_addr *laddr6, *faddr6; 727 #endif 728 729 pcbinfo = inp->inp_pcbinfo; 730 731 /* 732 * Because no actual state changes occur here, a global write lock on 733 * the pcbinfo isn't required. 734 */ 735 INP_LOCK_ASSERT(inp); 736 INP_HASH_LOCK_ASSERT(pcbinfo); 737 738 if (inp->inp_flags & INP_HIGHPORT) { 739 first = V_ipport_hifirstauto; /* sysctl */ 740 last = V_ipport_hilastauto; 741 lastport = &pcbinfo->ipi_lasthi; 742 } else if (inp->inp_flags & INP_LOWPORT) { 743 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT); 744 if (error) 745 return (error); 746 first = V_ipport_lowfirstauto; /* 1023 */ 747 last = V_ipport_lowlastauto; /* 600 */ 748 lastport = &pcbinfo->ipi_lastlow; 749 } else { 750 first = V_ipport_firstauto; /* sysctl */ 751 last = V_ipport_lastauto; 752 lastport = &pcbinfo->ipi_lastport; 753 } 754 755 /* 756 * Instead of having two loops further down counting up or down 757 * make sure that first is always <= last and go with only one 758 * code path implementing all logic. 759 */ 760 if (first > last) { 761 aux = first; 762 first = last; 763 last = aux; 764 } 765 766 #ifdef INET 767 laddr.s_addr = INADDR_ANY; /* used by INET6+INET below too */ 768 if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) { 769 if (lsa != NULL) 770 laddr = ((struct sockaddr_in *)lsa)->sin_addr; 771 if (fsa != NULL) 772 faddr = ((struct sockaddr_in *)fsa)->sin_addr; 773 } 774 #endif 775 #ifdef INET6 776 laddr6 = NULL; 777 if ((inp->inp_vflag & INP_IPV6) != 0) { 778 if (lsa != NULL) 779 laddr6 = &((struct sockaddr_in6 *)lsa)->sin6_addr; 780 if (fsa != NULL) 781 faddr6 = &((struct sockaddr_in6 *)fsa)->sin6_addr; 782 } 783 #endif 784 785 tmpinp = NULL; 786 lport = *lportp; 787 788 if (V_ipport_randomized) 789 *lastport = first + (arc4random() % (last - first)); 790 791 count = last - first; 792 793 do { 794 if (count-- < 0) /* completely used? */ 795 return (EADDRNOTAVAIL); 796 ++*lastport; 797 if (*lastport < first || *lastport > last) 798 *lastport = first; 799 lport = htons(*lastport); 800 801 if (fsa != NULL) { 802 #ifdef INET 803 if (lsa->sa_family == AF_INET) { 804 tmpinp = in_pcblookup_hash_locked(pcbinfo, 805 faddr, fport, laddr, lport, lookupflags, 806 M_NODOM); 807 } 808 #endif 809 #ifdef INET6 810 if (lsa->sa_family == AF_INET6) { 811 tmpinp = in6_pcblookup_hash_locked(pcbinfo, 812 faddr6, fport, laddr6, lport, lookupflags, 813 M_NODOM); 814 } 815 #endif 816 } else { 817 #ifdef INET6 818 if ((inp->inp_vflag & INP_IPV6) != 0) { 819 tmpinp = in6_pcblookup_local(pcbinfo, 820 &inp->in6p_laddr, lport, lookupflags, cred); 821 #ifdef INET 822 if (tmpinp == NULL && 823 (inp->inp_vflag & INP_IPV4)) 824 tmpinp = in_pcblookup_local(pcbinfo, 825 laddr, lport, lookupflags, cred); 826 #endif 827 } 828 #endif 829 #if defined(INET) && defined(INET6) 830 else 831 #endif 832 #ifdef INET 833 tmpinp = in_pcblookup_local(pcbinfo, laddr, 834 lport, lookupflags, cred); 835 #endif 836 } 837 } while (tmpinp != NULL); 838 839 *lportp = lport; 840 841 return (0); 842 } 843 844 /* 845 * Select a local port (number) to use. 846 */ 847 int 848 in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp, 849 struct ucred *cred, int lookupflags) 850 { 851 struct sockaddr_in laddr; 852 853 if (laddrp) { 854 bzero(&laddr, sizeof(laddr)); 855 laddr.sin_family = AF_INET; 856 laddr.sin_addr = *laddrp; 857 } 858 return (in_pcb_lport_dest(inp, laddrp ? (struct sockaddr *) &laddr : 859 NULL, lportp, NULL, 0, cred, lookupflags)); 860 } 861 #endif /* INET || INET6 */ 862 863 #ifdef INET 864 /* 865 * Set up a bind operation on a PCB, performing port allocation 866 * as required, but do not actually modify the PCB. Callers can 867 * either complete the bind by setting inp_laddr/inp_lport and 868 * calling in_pcbinshash(), or they can just use the resulting 869 * port and address to authorise the sending of a once-off packet. 870 * 871 * On error, the values of *laddrp and *lportp are not changed. 872 */ 873 int 874 in_pcbbind_setup(struct inpcb *inp, struct sockaddr_in *sin, in_addr_t *laddrp, 875 u_short *lportp, struct ucred *cred) 876 { 877 struct socket *so = inp->inp_socket; 878 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 879 struct in_addr laddr; 880 u_short lport = 0; 881 int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT); 882 int error; 883 884 /* 885 * XXX: Maybe we could let SO_REUSEPORT_LB set SO_REUSEPORT bit here 886 * so that we don't have to add to the (already messy) code below. 887 */ 888 int reuseport_lb = (so->so_options & SO_REUSEPORT_LB); 889 890 /* 891 * No state changes, so read locks are sufficient here. 892 */ 893 INP_LOCK_ASSERT(inp); 894 INP_HASH_LOCK_ASSERT(pcbinfo); 895 896 laddr.s_addr = *laddrp; 897 if (sin != NULL && laddr.s_addr != INADDR_ANY) 898 return (EINVAL); 899 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT|SO_REUSEPORT_LB)) == 0) 900 lookupflags = INPLOOKUP_WILDCARD; 901 if (sin == NULL) { 902 if ((error = prison_local_ip4(cred, &laddr)) != 0) 903 return (error); 904 } else { 905 KASSERT(sin->sin_family == AF_INET, 906 ("%s: invalid family for address %p", __func__, sin)); 907 KASSERT(sin->sin_len == sizeof(*sin), 908 ("%s: invalid length for address %p", __func__, sin)); 909 910 error = prison_local_ip4(cred, &sin->sin_addr); 911 if (error) 912 return (error); 913 if (sin->sin_port != *lportp) { 914 /* Don't allow the port to change. */ 915 if (*lportp != 0) 916 return (EINVAL); 917 lport = sin->sin_port; 918 } 919 /* NB: lport is left as 0 if the port isn't being changed. */ 920 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 921 /* 922 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 923 * allow complete duplication of binding if 924 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 925 * and a multicast address is bound on both 926 * new and duplicated sockets. 927 */ 928 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0) 929 reuseport = SO_REUSEADDR|SO_REUSEPORT; 930 /* 931 * XXX: How to deal with SO_REUSEPORT_LB here? 932 * Treat same as SO_REUSEPORT for now. 933 */ 934 if ((so->so_options & 935 (SO_REUSEADDR|SO_REUSEPORT_LB)) != 0) 936 reuseport_lb = SO_REUSEADDR|SO_REUSEPORT_LB; 937 } else if (sin->sin_addr.s_addr != INADDR_ANY) { 938 sin->sin_port = 0; /* yech... */ 939 bzero(&sin->sin_zero, sizeof(sin->sin_zero)); 940 /* 941 * Is the address a local IP address? 942 * If INP_BINDANY is set, then the socket may be bound 943 * to any endpoint address, local or not. 944 */ 945 if ((inp->inp_flags & INP_BINDANY) == 0 && 946 ifa_ifwithaddr_check((struct sockaddr *)sin) == 0) 947 return (EADDRNOTAVAIL); 948 } 949 laddr = sin->sin_addr; 950 if (lport) { 951 struct inpcb *t; 952 953 /* GROSS */ 954 if (ntohs(lport) <= V_ipport_reservedhigh && 955 ntohs(lport) >= V_ipport_reservedlow && 956 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT)) 957 return (EACCES); 958 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) && 959 priv_check_cred(inp->inp_cred, PRIV_NETINET_REUSEPORT) != 0) { 960 t = in_pcblookup_local(pcbinfo, sin->sin_addr, 961 lport, INPLOOKUP_WILDCARD, cred); 962 /* 963 * XXX 964 * This entire block sorely needs a rewrite. 965 */ 966 if (t != NULL && 967 (so->so_type != SOCK_STREAM || 968 ntohl(t->inp_faddr.s_addr) == INADDR_ANY) && 969 (ntohl(sin->sin_addr.s_addr) != INADDR_ANY || 970 ntohl(t->inp_laddr.s_addr) != INADDR_ANY || 971 (t->inp_socket->so_options & SO_REUSEPORT) || 972 (t->inp_socket->so_options & SO_REUSEPORT_LB) == 0) && 973 (inp->inp_cred->cr_uid != 974 t->inp_cred->cr_uid)) 975 return (EADDRINUSE); 976 } 977 t = in_pcblookup_local(pcbinfo, sin->sin_addr, 978 lport, lookupflags, cred); 979 if (t != NULL && (reuseport & t->inp_socket->so_options) == 0 && 980 (reuseport_lb & t->inp_socket->so_options) == 0) { 981 #ifdef INET6 982 if (ntohl(sin->sin_addr.s_addr) != 983 INADDR_ANY || 984 ntohl(t->inp_laddr.s_addr) != 985 INADDR_ANY || 986 (inp->inp_vflag & INP_IPV6PROTO) == 0 || 987 (t->inp_vflag & INP_IPV6PROTO) == 0) 988 #endif 989 return (EADDRINUSE); 990 } 991 } 992 } 993 if (*lportp != 0) 994 lport = *lportp; 995 if (lport == 0) { 996 error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags); 997 if (error != 0) 998 return (error); 999 } 1000 *laddrp = laddr.s_addr; 1001 *lportp = lport; 1002 return (0); 1003 } 1004 1005 /* 1006 * Connect from a socket to a specified address. 1007 * Both address and port must be specified in argument sin. 1008 * If don't have a local address for this socket yet, 1009 * then pick one. 1010 */ 1011 int 1012 in_pcbconnect(struct inpcb *inp, struct sockaddr_in *sin, struct ucred *cred, 1013 bool rehash __unused) 1014 { 1015 u_short lport, fport; 1016 in_addr_t laddr, faddr; 1017 int anonport, error; 1018 1019 INP_WLOCK_ASSERT(inp); 1020 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 1021 KASSERT(in_nullhost(inp->inp_faddr), 1022 ("%s: inp is already connected", __func__)); 1023 1024 lport = inp->inp_lport; 1025 laddr = inp->inp_laddr.s_addr; 1026 anonport = (lport == 0); 1027 error = in_pcbconnect_setup(inp, sin, &laddr, &lport, &faddr, &fport, 1028 cred); 1029 if (error) 1030 return (error); 1031 1032 inp->inp_faddr.s_addr = faddr; 1033 inp->inp_fport = fport; 1034 1035 /* Do the initial binding of the local address if required. */ 1036 if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) { 1037 inp->inp_lport = lport; 1038 inp->inp_laddr.s_addr = laddr; 1039 if (in_pcbinshash(inp) != 0) { 1040 inp->inp_laddr.s_addr = inp->inp_faddr.s_addr = 1041 INADDR_ANY; 1042 inp->inp_lport = inp->inp_fport = 0; 1043 return (EAGAIN); 1044 } 1045 } else { 1046 inp->inp_lport = lport; 1047 inp->inp_laddr.s_addr = laddr; 1048 if ((inp->inp_flags & INP_INHASHLIST) != 0) 1049 in_pcbrehash(inp); 1050 else 1051 in_pcbinshash(inp); 1052 } 1053 1054 if (anonport) 1055 inp->inp_flags |= INP_ANONPORT; 1056 return (0); 1057 } 1058 1059 /* 1060 * Do proper source address selection on an unbound socket in case 1061 * of connect. Take jails into account as well. 1062 */ 1063 int 1064 in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr, 1065 struct ucred *cred) 1066 { 1067 struct ifaddr *ifa; 1068 struct sockaddr *sa; 1069 struct sockaddr_in *sin, dst; 1070 struct nhop_object *nh; 1071 int error; 1072 1073 NET_EPOCH_ASSERT(); 1074 KASSERT(laddr != NULL, ("%s: laddr NULL", __func__)); 1075 1076 /* 1077 * Bypass source address selection and use the primary jail IP 1078 * if requested. 1079 */ 1080 if (!prison_saddrsel_ip4(cred, laddr)) 1081 return (0); 1082 1083 error = 0; 1084 1085 nh = NULL; 1086 bzero(&dst, sizeof(dst)); 1087 sin = &dst; 1088 sin->sin_family = AF_INET; 1089 sin->sin_len = sizeof(struct sockaddr_in); 1090 sin->sin_addr.s_addr = faddr->s_addr; 1091 1092 /* 1093 * If route is known our src addr is taken from the i/f, 1094 * else punt. 1095 * 1096 * Find out route to destination. 1097 */ 1098 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0) 1099 nh = fib4_lookup(inp->inp_inc.inc_fibnum, *faddr, 1100 0, NHR_NONE, 0); 1101 1102 /* 1103 * If we found a route, use the address corresponding to 1104 * the outgoing interface. 1105 * 1106 * Otherwise assume faddr is reachable on a directly connected 1107 * network and try to find a corresponding interface to take 1108 * the source address from. 1109 */ 1110 if (nh == NULL || nh->nh_ifp == NULL) { 1111 struct in_ifaddr *ia; 1112 struct ifnet *ifp; 1113 1114 ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin, 1115 inp->inp_socket->so_fibnum)); 1116 if (ia == NULL) { 1117 ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0, 1118 inp->inp_socket->so_fibnum)); 1119 } 1120 if (ia == NULL) { 1121 error = ENETUNREACH; 1122 goto done; 1123 } 1124 1125 if (!prison_flag(cred, PR_IP4)) { 1126 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1127 goto done; 1128 } 1129 1130 ifp = ia->ia_ifp; 1131 ia = NULL; 1132 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1133 sa = ifa->ifa_addr; 1134 if (sa->sa_family != AF_INET) 1135 continue; 1136 sin = (struct sockaddr_in *)sa; 1137 if (prison_check_ip4(cred, &sin->sin_addr) == 0) { 1138 ia = (struct in_ifaddr *)ifa; 1139 break; 1140 } 1141 } 1142 if (ia != NULL) { 1143 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1144 goto done; 1145 } 1146 1147 /* 3. As a last resort return the 'default' jail address. */ 1148 error = prison_get_ip4(cred, laddr); 1149 goto done; 1150 } 1151 1152 /* 1153 * If the outgoing interface on the route found is not 1154 * a loopback interface, use the address from that interface. 1155 * In case of jails do those three steps: 1156 * 1. check if the interface address belongs to the jail. If so use it. 1157 * 2. check if we have any address on the outgoing interface 1158 * belonging to this jail. If so use it. 1159 * 3. as a last resort return the 'default' jail address. 1160 */ 1161 if ((nh->nh_ifp->if_flags & IFF_LOOPBACK) == 0) { 1162 struct in_ifaddr *ia; 1163 struct ifnet *ifp; 1164 1165 /* If not jailed, use the default returned. */ 1166 if (!prison_flag(cred, PR_IP4)) { 1167 ia = (struct in_ifaddr *)nh->nh_ifa; 1168 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1169 goto done; 1170 } 1171 1172 /* Jailed. */ 1173 /* 1. Check if the iface address belongs to the jail. */ 1174 sin = (struct sockaddr_in *)nh->nh_ifa->ifa_addr; 1175 if (prison_check_ip4(cred, &sin->sin_addr) == 0) { 1176 ia = (struct in_ifaddr *)nh->nh_ifa; 1177 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1178 goto done; 1179 } 1180 1181 /* 1182 * 2. Check if we have any address on the outgoing interface 1183 * belonging to this jail. 1184 */ 1185 ia = NULL; 1186 ifp = nh->nh_ifp; 1187 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1188 sa = ifa->ifa_addr; 1189 if (sa->sa_family != AF_INET) 1190 continue; 1191 sin = (struct sockaddr_in *)sa; 1192 if (prison_check_ip4(cred, &sin->sin_addr) == 0) { 1193 ia = (struct in_ifaddr *)ifa; 1194 break; 1195 } 1196 } 1197 if (ia != NULL) { 1198 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1199 goto done; 1200 } 1201 1202 /* 3. As a last resort return the 'default' jail address. */ 1203 error = prison_get_ip4(cred, laddr); 1204 goto done; 1205 } 1206 1207 /* 1208 * The outgoing interface is marked with 'loopback net', so a route 1209 * to ourselves is here. 1210 * Try to find the interface of the destination address and then 1211 * take the address from there. That interface is not necessarily 1212 * a loopback interface. 1213 * In case of jails, check that it is an address of the jail 1214 * and if we cannot find, fall back to the 'default' jail address. 1215 */ 1216 if ((nh->nh_ifp->if_flags & IFF_LOOPBACK) != 0) { 1217 struct in_ifaddr *ia; 1218 1219 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&dst), 1220 inp->inp_socket->so_fibnum)); 1221 if (ia == NULL) 1222 ia = ifatoia(ifa_ifwithnet(sintosa(&dst), 0, 1223 inp->inp_socket->so_fibnum)); 1224 if (ia == NULL) 1225 ia = ifatoia(ifa_ifwithaddr(sintosa(&dst))); 1226 1227 if (!prison_flag(cred, PR_IP4)) { 1228 if (ia == NULL) { 1229 error = ENETUNREACH; 1230 goto done; 1231 } 1232 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1233 goto done; 1234 } 1235 1236 /* Jailed. */ 1237 if (ia != NULL) { 1238 struct ifnet *ifp; 1239 1240 ifp = ia->ia_ifp; 1241 ia = NULL; 1242 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1243 sa = ifa->ifa_addr; 1244 if (sa->sa_family != AF_INET) 1245 continue; 1246 sin = (struct sockaddr_in *)sa; 1247 if (prison_check_ip4(cred, 1248 &sin->sin_addr) == 0) { 1249 ia = (struct in_ifaddr *)ifa; 1250 break; 1251 } 1252 } 1253 if (ia != NULL) { 1254 laddr->s_addr = ia->ia_addr.sin_addr.s_addr; 1255 goto done; 1256 } 1257 } 1258 1259 /* 3. As a last resort return the 'default' jail address. */ 1260 error = prison_get_ip4(cred, laddr); 1261 goto done; 1262 } 1263 1264 done: 1265 if (error == 0 && laddr->s_addr == INADDR_ANY) 1266 return (EHOSTUNREACH); 1267 return (error); 1268 } 1269 1270 /* 1271 * Set up for a connect from a socket to the specified address. 1272 * On entry, *laddrp and *lportp should contain the current local 1273 * address and port for the PCB; these are updated to the values 1274 * that should be placed in inp_laddr and inp_lport to complete 1275 * the connect. 1276 * 1277 * On success, *faddrp and *fportp will be set to the remote address 1278 * and port. These are not updated in the error case. 1279 */ 1280 int 1281 in_pcbconnect_setup(struct inpcb *inp, struct sockaddr_in *sin, 1282 in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp, 1283 struct ucred *cred) 1284 { 1285 struct in_ifaddr *ia; 1286 struct in_addr laddr, faddr; 1287 u_short lport, fport; 1288 int error; 1289 1290 KASSERT(sin->sin_family == AF_INET, 1291 ("%s: invalid address family for %p", __func__, sin)); 1292 KASSERT(sin->sin_len == sizeof(*sin), 1293 ("%s: invalid address length for %p", __func__, sin)); 1294 1295 /* 1296 * Because a global state change doesn't actually occur here, a read 1297 * lock is sufficient. 1298 */ 1299 NET_EPOCH_ASSERT(); 1300 INP_LOCK_ASSERT(inp); 1301 INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo); 1302 1303 if (sin->sin_port == 0) 1304 return (EADDRNOTAVAIL); 1305 laddr.s_addr = *laddrp; 1306 lport = *lportp; 1307 faddr = sin->sin_addr; 1308 fport = sin->sin_port; 1309 #ifdef ROUTE_MPATH 1310 if (CALC_FLOWID_OUTBOUND) { 1311 uint32_t hash_val, hash_type; 1312 1313 hash_val = fib4_calc_software_hash(laddr, faddr, 0, fport, 1314 inp->inp_socket->so_proto->pr_protocol, &hash_type); 1315 1316 inp->inp_flowid = hash_val; 1317 inp->inp_flowtype = hash_type; 1318 } 1319 #endif 1320 if (V_connect_inaddr_wild && !CK_STAILQ_EMPTY(&V_in_ifaddrhead)) { 1321 /* 1322 * If the destination address is INADDR_ANY, 1323 * use the primary local address. 1324 * If the supplied address is INADDR_BROADCAST, 1325 * and the primary interface supports broadcast, 1326 * choose the broadcast address for that interface. 1327 */ 1328 if (faddr.s_addr == INADDR_ANY) { 1329 faddr = 1330 IA_SIN(CK_STAILQ_FIRST(&V_in_ifaddrhead))->sin_addr; 1331 if ((error = prison_get_ip4(cred, &faddr)) != 0) 1332 return (error); 1333 } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) { 1334 if (CK_STAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags & 1335 IFF_BROADCAST) 1336 faddr = satosin(&CK_STAILQ_FIRST( 1337 &V_in_ifaddrhead)->ia_broadaddr)->sin_addr; 1338 } 1339 } else if (faddr.s_addr == INADDR_ANY) { 1340 return (ENETUNREACH); 1341 } 1342 if (laddr.s_addr == INADDR_ANY) { 1343 error = in_pcbladdr(inp, &faddr, &laddr, cred); 1344 /* 1345 * If the destination address is multicast and an outgoing 1346 * interface has been set as a multicast option, prefer the 1347 * address of that interface as our source address. 1348 */ 1349 if (IN_MULTICAST(ntohl(faddr.s_addr)) && 1350 inp->inp_moptions != NULL) { 1351 struct ip_moptions *imo; 1352 struct ifnet *ifp; 1353 1354 imo = inp->inp_moptions; 1355 if (imo->imo_multicast_ifp != NULL) { 1356 ifp = imo->imo_multicast_ifp; 1357 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1358 if (ia->ia_ifp == ifp && 1359 prison_check_ip4(cred, 1360 &ia->ia_addr.sin_addr) == 0) 1361 break; 1362 } 1363 if (ia == NULL) 1364 error = EADDRNOTAVAIL; 1365 else { 1366 laddr = ia->ia_addr.sin_addr; 1367 error = 0; 1368 } 1369 } 1370 } 1371 if (error) 1372 return (error); 1373 } 1374 1375 if (lport != 0) { 1376 if (in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, 1377 fport, laddr, lport, 0, M_NODOM) != NULL) 1378 return (EADDRINUSE); 1379 } else { 1380 struct sockaddr_in lsin, fsin; 1381 1382 bzero(&lsin, sizeof(lsin)); 1383 bzero(&fsin, sizeof(fsin)); 1384 lsin.sin_family = AF_INET; 1385 lsin.sin_addr = laddr; 1386 fsin.sin_family = AF_INET; 1387 fsin.sin_addr = faddr; 1388 error = in_pcb_lport_dest(inp, (struct sockaddr *) &lsin, 1389 &lport, (struct sockaddr *)& fsin, fport, cred, 1390 INPLOOKUP_WILDCARD); 1391 if (error) 1392 return (error); 1393 } 1394 *laddrp = laddr.s_addr; 1395 *lportp = lport; 1396 *faddrp = faddr.s_addr; 1397 *fportp = fport; 1398 return (0); 1399 } 1400 1401 void 1402 in_pcbdisconnect(struct inpcb *inp) 1403 { 1404 1405 INP_WLOCK_ASSERT(inp); 1406 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 1407 KASSERT(inp->inp_smr == SMR_SEQ_INVALID, 1408 ("%s: inp %p was already disconnected", __func__, inp)); 1409 1410 in_pcbremhash_locked(inp); 1411 1412 /* See the comment in in_pcbinshash(). */ 1413 inp->inp_smr = smr_advance(inp->inp_pcbinfo->ipi_smr); 1414 inp->inp_laddr.s_addr = INADDR_ANY; 1415 inp->inp_faddr.s_addr = INADDR_ANY; 1416 inp->inp_fport = 0; 1417 } 1418 #endif /* INET */ 1419 1420 /* 1421 * inpcb hash lookups are protected by SMR section. 1422 * 1423 * Once desired pcb has been found, switching from SMR section to a pcb 1424 * lock is performed with inp_smr_lock(). We can not use INP_(W|R)LOCK 1425 * here because SMR is a critical section. 1426 * In 99%+ cases inp_smr_lock() would obtain the lock immediately. 1427 */ 1428 void 1429 inp_lock(struct inpcb *inp, const inp_lookup_t lock) 1430 { 1431 1432 lock == INPLOOKUP_RLOCKPCB ? 1433 rw_rlock(&inp->inp_lock) : rw_wlock(&inp->inp_lock); 1434 } 1435 1436 void 1437 inp_unlock(struct inpcb *inp, const inp_lookup_t lock) 1438 { 1439 1440 lock == INPLOOKUP_RLOCKPCB ? 1441 rw_runlock(&inp->inp_lock) : rw_wunlock(&inp->inp_lock); 1442 } 1443 1444 int 1445 inp_trylock(struct inpcb *inp, const inp_lookup_t lock) 1446 { 1447 1448 return (lock == INPLOOKUP_RLOCKPCB ? 1449 rw_try_rlock(&inp->inp_lock) : rw_try_wlock(&inp->inp_lock)); 1450 } 1451 1452 static inline bool 1453 _inp_smr_lock(struct inpcb *inp, const inp_lookup_t lock, const int ignflags) 1454 { 1455 1456 MPASS(lock == INPLOOKUP_RLOCKPCB || lock == INPLOOKUP_WLOCKPCB); 1457 SMR_ASSERT_ENTERED(inp->inp_pcbinfo->ipi_smr); 1458 1459 if (__predict_true(inp_trylock(inp, lock))) { 1460 if (__predict_false(inp->inp_flags & ignflags)) { 1461 smr_exit(inp->inp_pcbinfo->ipi_smr); 1462 inp_unlock(inp, lock); 1463 return (false); 1464 } 1465 smr_exit(inp->inp_pcbinfo->ipi_smr); 1466 return (true); 1467 } 1468 1469 if (__predict_true(refcount_acquire_if_not_zero(&inp->inp_refcount))) { 1470 smr_exit(inp->inp_pcbinfo->ipi_smr); 1471 inp_lock(inp, lock); 1472 if (__predict_false(in_pcbrele(inp, lock))) 1473 return (false); 1474 /* 1475 * inp acquired through refcount & lock for sure didn't went 1476 * through uma_zfree(). However, it may have already went 1477 * through in_pcbfree() and has another reference, that 1478 * prevented its release by our in_pcbrele(). 1479 */ 1480 if (__predict_false(inp->inp_flags & ignflags)) { 1481 inp_unlock(inp, lock); 1482 return (false); 1483 } 1484 return (true); 1485 } else { 1486 smr_exit(inp->inp_pcbinfo->ipi_smr); 1487 return (false); 1488 } 1489 } 1490 1491 bool 1492 inp_smr_lock(struct inpcb *inp, const inp_lookup_t lock) 1493 { 1494 1495 /* 1496 * in_pcblookup() family of functions ignore not only freed entries, 1497 * that may be found due to lockless access to the hash, but dropped 1498 * entries, too. 1499 */ 1500 return (_inp_smr_lock(inp, lock, INP_FREED | INP_DROPPED)); 1501 } 1502 1503 /* 1504 * inp_next() - inpcb hash/list traversal iterator 1505 * 1506 * Requires initialized struct inpcb_iterator for context. 1507 * The structure can be initialized with INP_ITERATOR() or INP_ALL_ITERATOR(). 1508 * 1509 * - Iterator can have either write-lock or read-lock semantics, that can not 1510 * be changed later. 1511 * - Iterator can iterate either over all pcbs list (INP_ALL_LIST), or through 1512 * a single hash slot. Note: only rip_input() does the latter. 1513 * - Iterator may have optional bool matching function. The matching function 1514 * will be executed for each inpcb in the SMR context, so it can not acquire 1515 * locks and can safely access only immutable fields of inpcb. 1516 * 1517 * A fresh initialized iterator has NULL inpcb in its context and that 1518 * means that inp_next() call would return the very first inpcb on the list 1519 * locked with desired semantic. In all following calls the context pointer 1520 * shall hold the current inpcb pointer. The KPI user is not supposed to 1521 * unlock the current inpcb! Upon end of traversal inp_next() will return NULL 1522 * and write NULL to its context. After end of traversal an iterator can be 1523 * reused. 1524 * 1525 * List traversals have the following features/constraints: 1526 * - New entries won't be seen, as they are always added to the head of a list. 1527 * - Removed entries won't stop traversal as long as they are not added to 1528 * a different list. This is violated by in_pcbrehash(). 1529 */ 1530 #define II_LIST_FIRST(ipi, hash) \ 1531 (((hash) == INP_ALL_LIST) ? \ 1532 CK_LIST_FIRST(&(ipi)->ipi_listhead) : \ 1533 CK_LIST_FIRST(&(ipi)->ipi_hash_exact[(hash)])) 1534 #define II_LIST_NEXT(inp, hash) \ 1535 (((hash) == INP_ALL_LIST) ? \ 1536 CK_LIST_NEXT((inp), inp_list) : \ 1537 CK_LIST_NEXT((inp), inp_hash_exact)) 1538 #define II_LOCK_ASSERT(inp, lock) \ 1539 rw_assert(&(inp)->inp_lock, \ 1540 (lock) == INPLOOKUP_RLOCKPCB ? RA_RLOCKED : RA_WLOCKED ) 1541 struct inpcb * 1542 inp_next(struct inpcb_iterator *ii) 1543 { 1544 const struct inpcbinfo *ipi = ii->ipi; 1545 inp_match_t *match = ii->match; 1546 void *ctx = ii->ctx; 1547 inp_lookup_t lock = ii->lock; 1548 int hash = ii->hash; 1549 struct inpcb *inp; 1550 1551 if (ii->inp == NULL) { /* First call. */ 1552 smr_enter(ipi->ipi_smr); 1553 /* This is unrolled CK_LIST_FOREACH(). */ 1554 for (inp = II_LIST_FIRST(ipi, hash); 1555 inp != NULL; 1556 inp = II_LIST_NEXT(inp, hash)) { 1557 if (match != NULL && (match)(inp, ctx) == false) 1558 continue; 1559 if (__predict_true(_inp_smr_lock(inp, lock, INP_FREED))) 1560 break; 1561 else { 1562 smr_enter(ipi->ipi_smr); 1563 MPASS(inp != II_LIST_FIRST(ipi, hash)); 1564 inp = II_LIST_FIRST(ipi, hash); 1565 if (inp == NULL) 1566 break; 1567 } 1568 } 1569 1570 if (inp == NULL) 1571 smr_exit(ipi->ipi_smr); 1572 else 1573 ii->inp = inp; 1574 1575 return (inp); 1576 } 1577 1578 /* Not a first call. */ 1579 smr_enter(ipi->ipi_smr); 1580 restart: 1581 inp = ii->inp; 1582 II_LOCK_ASSERT(inp, lock); 1583 next: 1584 inp = II_LIST_NEXT(inp, hash); 1585 if (inp == NULL) { 1586 smr_exit(ipi->ipi_smr); 1587 goto found; 1588 } 1589 1590 if (match != NULL && (match)(inp, ctx) == false) 1591 goto next; 1592 1593 if (__predict_true(inp_trylock(inp, lock))) { 1594 if (__predict_false(inp->inp_flags & INP_FREED)) { 1595 /* 1596 * Entries are never inserted in middle of a list, thus 1597 * as long as we are in SMR, we can continue traversal. 1598 * Jump to 'restart' should yield in the same result, 1599 * but could produce unnecessary looping. Could this 1600 * looping be unbound? 1601 */ 1602 inp_unlock(inp, lock); 1603 goto next; 1604 } else { 1605 smr_exit(ipi->ipi_smr); 1606 goto found; 1607 } 1608 } 1609 1610 /* 1611 * Can't obtain lock immediately, thus going hard. Once we exit the 1612 * SMR section we can no longer jump to 'next', and our only stable 1613 * anchoring point is ii->inp, which we keep locked for this case, so 1614 * we jump to 'restart'. 1615 */ 1616 if (__predict_true(refcount_acquire_if_not_zero(&inp->inp_refcount))) { 1617 smr_exit(ipi->ipi_smr); 1618 inp_lock(inp, lock); 1619 if (__predict_false(in_pcbrele(inp, lock))) { 1620 smr_enter(ipi->ipi_smr); 1621 goto restart; 1622 } 1623 /* 1624 * See comment in inp_smr_lock(). 1625 */ 1626 if (__predict_false(inp->inp_flags & INP_FREED)) { 1627 inp_unlock(inp, lock); 1628 smr_enter(ipi->ipi_smr); 1629 goto restart; 1630 } 1631 } else 1632 goto next; 1633 1634 found: 1635 inp_unlock(ii->inp, lock); 1636 ii->inp = inp; 1637 1638 return (ii->inp); 1639 } 1640 1641 /* 1642 * in_pcbref() bumps the reference count on an inpcb in order to maintain 1643 * stability of an inpcb pointer despite the inpcb lock being released or 1644 * SMR section exited. 1645 * 1646 * To free a reference later in_pcbrele_(r|w)locked() must be performed. 1647 */ 1648 void 1649 in_pcbref(struct inpcb *inp) 1650 { 1651 u_int old __diagused; 1652 1653 old = refcount_acquire(&inp->inp_refcount); 1654 KASSERT(old > 0, ("%s: refcount 0", __func__)); 1655 } 1656 1657 /* 1658 * Drop a refcount on an inpcb elevated using in_pcbref(), potentially 1659 * freeing the pcb, if the reference was very last. 1660 */ 1661 bool 1662 in_pcbrele_rlocked(struct inpcb *inp) 1663 { 1664 1665 INP_RLOCK_ASSERT(inp); 1666 1667 if (!refcount_release(&inp->inp_refcount)) 1668 return (false); 1669 1670 MPASS(inp->inp_flags & INP_FREED); 1671 MPASS(inp->inp_socket == NULL); 1672 crfree(inp->inp_cred); 1673 #ifdef INVARIANTS 1674 inp->inp_cred = NULL; 1675 #endif 1676 INP_RUNLOCK(inp); 1677 uma_zfree_smr(inp->inp_pcbinfo->ipi_zone, inp); 1678 return (true); 1679 } 1680 1681 bool 1682 in_pcbrele_wlocked(struct inpcb *inp) 1683 { 1684 1685 INP_WLOCK_ASSERT(inp); 1686 1687 if (!refcount_release(&inp->inp_refcount)) 1688 return (false); 1689 1690 MPASS(inp->inp_flags & INP_FREED); 1691 MPASS(inp->inp_socket == NULL); 1692 crfree(inp->inp_cred); 1693 #ifdef INVARIANTS 1694 inp->inp_cred = NULL; 1695 #endif 1696 INP_WUNLOCK(inp); 1697 uma_zfree_smr(inp->inp_pcbinfo->ipi_zone, inp); 1698 return (true); 1699 } 1700 1701 bool 1702 in_pcbrele(struct inpcb *inp, const inp_lookup_t lock) 1703 { 1704 1705 return (lock == INPLOOKUP_RLOCKPCB ? 1706 in_pcbrele_rlocked(inp) : in_pcbrele_wlocked(inp)); 1707 } 1708 1709 /* 1710 * Unconditionally schedule an inpcb to be freed by decrementing its 1711 * reference count, which should occur only after the inpcb has been detached 1712 * from its socket. If another thread holds a temporary reference (acquired 1713 * using in_pcbref()) then the free is deferred until that reference is 1714 * released using in_pcbrele_(r|w)locked(), but the inpcb is still unlocked. 1715 * Almost all work, including removal from global lists, is done in this 1716 * context, where the pcbinfo lock is held. 1717 */ 1718 void 1719 in_pcbfree(struct inpcb *inp) 1720 { 1721 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 1722 #ifdef INET 1723 struct ip_moptions *imo; 1724 #endif 1725 #ifdef INET6 1726 struct ip6_moptions *im6o; 1727 #endif 1728 1729 INP_WLOCK_ASSERT(inp); 1730 KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__)); 1731 KASSERT((inp->inp_flags & INP_FREED) == 0, 1732 ("%s: called twice for pcb %p", __func__, inp)); 1733 1734 /* 1735 * in_pcblookup_local() and in6_pcblookup_local() may return an inpcb 1736 * from the hash without acquiring inpcb lock, they rely on the hash 1737 * lock, thus in_pcbremhash() should be the first action. 1738 */ 1739 if (inp->inp_flags & INP_INHASHLIST) 1740 in_pcbremhash(inp); 1741 INP_INFO_WLOCK(pcbinfo); 1742 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 1743 pcbinfo->ipi_count--; 1744 CK_LIST_REMOVE(inp, inp_list); 1745 INP_INFO_WUNLOCK(pcbinfo); 1746 1747 #ifdef RATELIMIT 1748 if (inp->inp_snd_tag != NULL) 1749 in_pcbdetach_txrtlmt(inp); 1750 #endif 1751 inp->inp_flags |= INP_FREED; 1752 inp->inp_socket->so_pcb = NULL; 1753 inp->inp_socket = NULL; 1754 1755 RO_INVALIDATE_CACHE(&inp->inp_route); 1756 #ifdef MAC 1757 mac_inpcb_destroy(inp); 1758 #endif 1759 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1760 if (inp->inp_sp != NULL) 1761 ipsec_delete_pcbpolicy(inp); 1762 #endif 1763 #ifdef INET 1764 if (inp->inp_options) 1765 (void)m_free(inp->inp_options); 1766 DEBUG_POISON_POINTER(inp->inp_options); 1767 imo = inp->inp_moptions; 1768 DEBUG_POISON_POINTER(inp->inp_moptions); 1769 #endif 1770 #ifdef INET6 1771 if (inp->inp_vflag & INP_IPV6PROTO) { 1772 ip6_freepcbopts(inp->in6p_outputopts); 1773 DEBUG_POISON_POINTER(inp->in6p_outputopts); 1774 im6o = inp->in6p_moptions; 1775 DEBUG_POISON_POINTER(inp->in6p_moptions); 1776 } else 1777 im6o = NULL; 1778 #endif 1779 1780 if (__predict_false(in_pcbrele_wlocked(inp) == false)) { 1781 INP_WUNLOCK(inp); 1782 } 1783 #ifdef INET6 1784 ip6_freemoptions(im6o); 1785 #endif 1786 #ifdef INET 1787 inp_freemoptions(imo); 1788 #endif 1789 } 1790 1791 /* 1792 * Different protocols initialize their inpcbs differently - giving 1793 * different name to the lock. But they all are disposed the same. 1794 */ 1795 static void 1796 inpcb_fini(void *mem, int size) 1797 { 1798 struct inpcb *inp = mem; 1799 1800 INP_LOCK_DESTROY(inp); 1801 } 1802 1803 /* 1804 * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and 1805 * port reservation, and preventing it from being returned by inpcb lookups. 1806 * 1807 * It is used by TCP to mark an inpcb as unused and avoid future packet 1808 * delivery or event notification when a socket remains open but TCP has 1809 * closed. This might occur as a result of a shutdown()-initiated TCP close 1810 * or a RST on the wire, and allows the port binding to be reused while still 1811 * maintaining the invariant that so_pcb always points to a valid inpcb until 1812 * in_pcbdetach(). 1813 * 1814 * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by 1815 * in_pcbpurgeif0()? 1816 */ 1817 void 1818 in_pcbdrop(struct inpcb *inp) 1819 { 1820 1821 INP_WLOCK_ASSERT(inp); 1822 1823 inp->inp_flags |= INP_DROPPED; 1824 if (inp->inp_flags & INP_INHASHLIST) 1825 in_pcbremhash(inp); 1826 } 1827 1828 #ifdef INET 1829 /* 1830 * Common routines to return the socket addresses associated with inpcbs. 1831 */ 1832 int 1833 in_getsockaddr(struct socket *so, struct sockaddr *sa) 1834 { 1835 struct inpcb *inp; 1836 1837 inp = sotoinpcb(so); 1838 KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL")); 1839 1840 *(struct sockaddr_in *)sa = (struct sockaddr_in ){ 1841 .sin_len = sizeof(struct sockaddr_in), 1842 .sin_family = AF_INET, 1843 .sin_port = inp->inp_lport, 1844 .sin_addr = inp->inp_laddr, 1845 }; 1846 1847 return (0); 1848 } 1849 1850 int 1851 in_getpeeraddr(struct socket *so, struct sockaddr *sa) 1852 { 1853 struct inpcb *inp; 1854 1855 inp = sotoinpcb(so); 1856 KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL")); 1857 1858 *(struct sockaddr_in *)sa = (struct sockaddr_in ){ 1859 .sin_len = sizeof(struct sockaddr_in), 1860 .sin_family = AF_INET, 1861 .sin_port = inp->inp_fport, 1862 .sin_addr = inp->inp_faddr, 1863 }; 1864 1865 return (0); 1866 } 1867 1868 static bool 1869 inp_v4_multi_match(const struct inpcb *inp, void *v __unused) 1870 { 1871 1872 if ((inp->inp_vflag & INP_IPV4) && inp->inp_moptions != NULL) 1873 return (true); 1874 else 1875 return (false); 1876 } 1877 1878 void 1879 in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 1880 { 1881 struct inpcb_iterator inpi = INP_ITERATOR(pcbinfo, INPLOOKUP_WLOCKPCB, 1882 inp_v4_multi_match, NULL); 1883 struct inpcb *inp; 1884 struct in_multi *inm; 1885 struct in_mfilter *imf; 1886 struct ip_moptions *imo; 1887 1888 IN_MULTI_LOCK_ASSERT(); 1889 1890 while ((inp = inp_next(&inpi)) != NULL) { 1891 INP_WLOCK_ASSERT(inp); 1892 1893 imo = inp->inp_moptions; 1894 /* 1895 * Unselect the outgoing interface if it is being 1896 * detached. 1897 */ 1898 if (imo->imo_multicast_ifp == ifp) 1899 imo->imo_multicast_ifp = NULL; 1900 1901 /* 1902 * Drop multicast group membership if we joined 1903 * through the interface being detached. 1904 * 1905 * XXX This can all be deferred to an epoch_call 1906 */ 1907 restart: 1908 IP_MFILTER_FOREACH(imf, &imo->imo_head) { 1909 if ((inm = imf->imf_inm) == NULL) 1910 continue; 1911 if (inm->inm_ifp != ifp) 1912 continue; 1913 ip_mfilter_remove(&imo->imo_head, imf); 1914 in_leavegroup_locked(inm, NULL); 1915 ip_mfilter_free(imf); 1916 goto restart; 1917 } 1918 } 1919 } 1920 1921 /* 1922 * Lookup a PCB based on the local address and port. Caller must hold the 1923 * hash lock. No inpcb locks or references are acquired. 1924 */ 1925 #define INP_LOOKUP_MAPPED_PCB_COST 3 1926 struct inpcb * 1927 in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr, 1928 u_short lport, int lookupflags, struct ucred *cred) 1929 { 1930 struct inpcb *inp; 1931 #ifdef INET6 1932 int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST; 1933 #else 1934 int matchwild = 3; 1935 #endif 1936 int wildcard; 1937 1938 KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0, 1939 ("%s: invalid lookup flags %d", __func__, lookupflags)); 1940 INP_HASH_LOCK_ASSERT(pcbinfo); 1941 1942 if ((lookupflags & INPLOOKUP_WILDCARD) == 0) { 1943 struct inpcbhead *head; 1944 /* 1945 * Look for an unconnected (wildcard foreign addr) PCB that 1946 * matches the local address and port we're looking for. 1947 */ 1948 head = &pcbinfo->ipi_hash_wild[INP_PCBHASH_WILD(lport, 1949 pcbinfo->ipi_hashmask)]; 1950 CK_LIST_FOREACH(inp, head, inp_hash_wild) { 1951 #ifdef INET6 1952 /* XXX inp locking */ 1953 if ((inp->inp_vflag & INP_IPV4) == 0) 1954 continue; 1955 #endif 1956 if (inp->inp_faddr.s_addr == INADDR_ANY && 1957 inp->inp_laddr.s_addr == laddr.s_addr && 1958 inp->inp_lport == lport) { 1959 /* 1960 * Found? 1961 */ 1962 if (prison_equal_ip4(cred->cr_prison, 1963 inp->inp_cred->cr_prison)) 1964 return (inp); 1965 } 1966 } 1967 /* 1968 * Not found. 1969 */ 1970 return (NULL); 1971 } else { 1972 struct inpcbporthead *porthash; 1973 struct inpcbport *phd; 1974 struct inpcb *match = NULL; 1975 /* 1976 * Best fit PCB lookup. 1977 * 1978 * First see if this local port is in use by looking on the 1979 * port hash list. 1980 */ 1981 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 1982 pcbinfo->ipi_porthashmask)]; 1983 CK_LIST_FOREACH(phd, porthash, phd_hash) { 1984 if (phd->phd_port == lport) 1985 break; 1986 } 1987 if (phd != NULL) { 1988 /* 1989 * Port is in use by one or more PCBs. Look for best 1990 * fit. 1991 */ 1992 CK_LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 1993 wildcard = 0; 1994 if (!prison_equal_ip4(inp->inp_cred->cr_prison, 1995 cred->cr_prison)) 1996 continue; 1997 #ifdef INET6 1998 /* XXX inp locking */ 1999 if ((inp->inp_vflag & INP_IPV4) == 0) 2000 continue; 2001 /* 2002 * We never select the PCB that has 2003 * INP_IPV6 flag and is bound to :: if 2004 * we have another PCB which is bound 2005 * to 0.0.0.0. If a PCB has the 2006 * INP_IPV6 flag, then we set its cost 2007 * higher than IPv4 only PCBs. 2008 * 2009 * Note that the case only happens 2010 * when a socket is bound to ::, under 2011 * the condition that the use of the 2012 * mapped address is allowed. 2013 */ 2014 if ((inp->inp_vflag & INP_IPV6) != 0) 2015 wildcard += INP_LOOKUP_MAPPED_PCB_COST; 2016 #endif 2017 if (inp->inp_faddr.s_addr != INADDR_ANY) 2018 wildcard++; 2019 if (inp->inp_laddr.s_addr != INADDR_ANY) { 2020 if (laddr.s_addr == INADDR_ANY) 2021 wildcard++; 2022 else if (inp->inp_laddr.s_addr != laddr.s_addr) 2023 continue; 2024 } else { 2025 if (laddr.s_addr != INADDR_ANY) 2026 wildcard++; 2027 } 2028 if (wildcard < matchwild) { 2029 match = inp; 2030 matchwild = wildcard; 2031 if (matchwild == 0) 2032 break; 2033 } 2034 } 2035 } 2036 return (match); 2037 } 2038 } 2039 #undef INP_LOOKUP_MAPPED_PCB_COST 2040 2041 static bool 2042 in_pcblookup_lb_numa_match(const struct inpcblbgroup *grp, int domain) 2043 { 2044 return (domain == M_NODOM || domain == grp->il_numa_domain); 2045 } 2046 2047 static struct inpcb * 2048 in_pcblookup_lbgroup(const struct inpcbinfo *pcbinfo, 2049 const struct in_addr *faddr, uint16_t fport, const struct in_addr *laddr, 2050 uint16_t lport, int domain) 2051 { 2052 const struct inpcblbgrouphead *hdr; 2053 struct inpcblbgroup *grp; 2054 struct inpcblbgroup *jail_exact, *jail_wild, *local_exact, *local_wild; 2055 2056 INP_HASH_LOCK_ASSERT(pcbinfo); 2057 2058 hdr = &pcbinfo->ipi_lbgrouphashbase[ 2059 INP_PCBPORTHASH(lport, pcbinfo->ipi_lbgrouphashmask)]; 2060 2061 /* 2062 * Search for an LB group match based on the following criteria: 2063 * - prefer jailed groups to non-jailed groups 2064 * - prefer exact source address matches to wildcard matches 2065 * - prefer groups bound to the specified NUMA domain 2066 */ 2067 jail_exact = jail_wild = local_exact = local_wild = NULL; 2068 CK_LIST_FOREACH(grp, hdr, il_list) { 2069 bool injail; 2070 2071 #ifdef INET6 2072 if (!(grp->il_vflag & INP_IPV4)) 2073 continue; 2074 #endif 2075 if (grp->il_lport != lport) 2076 continue; 2077 2078 injail = prison_flag(grp->il_cred, PR_IP4) != 0; 2079 if (injail && prison_check_ip4_locked(grp->il_cred->cr_prison, 2080 laddr) != 0) 2081 continue; 2082 2083 if (grp->il_laddr.s_addr == laddr->s_addr) { 2084 if (injail) { 2085 jail_exact = grp; 2086 if (in_pcblookup_lb_numa_match(grp, domain)) 2087 /* This is a perfect match. */ 2088 goto out; 2089 } else if (local_exact == NULL || 2090 in_pcblookup_lb_numa_match(grp, domain)) { 2091 local_exact = grp; 2092 } 2093 } else if (grp->il_laddr.s_addr == INADDR_ANY) { 2094 if (injail) { 2095 if (jail_wild == NULL || 2096 in_pcblookup_lb_numa_match(grp, domain)) 2097 jail_wild = grp; 2098 } else if (local_wild == NULL || 2099 in_pcblookup_lb_numa_match(grp, domain)) { 2100 local_wild = grp; 2101 } 2102 } 2103 } 2104 2105 if (jail_exact != NULL) 2106 grp = jail_exact; 2107 else if (jail_wild != NULL) 2108 grp = jail_wild; 2109 else if (local_exact != NULL) 2110 grp = local_exact; 2111 else 2112 grp = local_wild; 2113 if (grp == NULL) 2114 return (NULL); 2115 out: 2116 return (grp->il_inp[INP_PCBLBGROUP_PKTHASH(faddr, lport, fport) % 2117 grp->il_inpcnt]); 2118 } 2119 2120 static bool 2121 in_pcblookup_exact_match(const struct inpcb *inp, struct in_addr faddr, 2122 u_short fport, struct in_addr laddr, u_short lport) 2123 { 2124 #ifdef INET6 2125 /* XXX inp locking */ 2126 if ((inp->inp_vflag & INP_IPV4) == 0) 2127 return (false); 2128 #endif 2129 if (inp->inp_faddr.s_addr == faddr.s_addr && 2130 inp->inp_laddr.s_addr == laddr.s_addr && 2131 inp->inp_fport == fport && 2132 inp->inp_lport == lport) 2133 return (true); 2134 return (false); 2135 } 2136 2137 static struct inpcb * 2138 in_pcblookup_hash_exact(struct inpcbinfo *pcbinfo, struct in_addr faddr, 2139 u_short fport, struct in_addr laddr, u_short lport) 2140 { 2141 struct inpcbhead *head; 2142 struct inpcb *inp; 2143 2144 INP_HASH_LOCK_ASSERT(pcbinfo); 2145 2146 head = &pcbinfo->ipi_hash_exact[INP_PCBHASH(&faddr, lport, fport, 2147 pcbinfo->ipi_hashmask)]; 2148 CK_LIST_FOREACH(inp, head, inp_hash_exact) { 2149 if (in_pcblookup_exact_match(inp, faddr, fport, laddr, lport)) 2150 return (inp); 2151 } 2152 return (NULL); 2153 } 2154 2155 typedef enum { 2156 INPLOOKUP_MATCH_NONE = 0, 2157 INPLOOKUP_MATCH_WILD = 1, 2158 INPLOOKUP_MATCH_LADDR = 2, 2159 } inp_lookup_match_t; 2160 2161 static inp_lookup_match_t 2162 in_pcblookup_wild_match(const struct inpcb *inp, struct in_addr laddr, 2163 u_short lport) 2164 { 2165 #ifdef INET6 2166 /* XXX inp locking */ 2167 if ((inp->inp_vflag & INP_IPV4) == 0) 2168 return (INPLOOKUP_MATCH_NONE); 2169 #endif 2170 if (inp->inp_faddr.s_addr != INADDR_ANY || inp->inp_lport != lport) 2171 return (INPLOOKUP_MATCH_NONE); 2172 if (inp->inp_laddr.s_addr == INADDR_ANY) 2173 return (INPLOOKUP_MATCH_WILD); 2174 if (inp->inp_laddr.s_addr == laddr.s_addr) 2175 return (INPLOOKUP_MATCH_LADDR); 2176 return (INPLOOKUP_MATCH_NONE); 2177 } 2178 2179 #define INP_LOOKUP_AGAIN ((struct inpcb *)(uintptr_t)-1) 2180 2181 static struct inpcb * 2182 in_pcblookup_hash_wild_smr(struct inpcbinfo *pcbinfo, struct in_addr faddr, 2183 u_short fport, struct in_addr laddr, u_short lport, 2184 const inp_lookup_t lockflags) 2185 { 2186 struct inpcbhead *head; 2187 struct inpcb *inp; 2188 2189 KASSERT(SMR_ENTERED(pcbinfo->ipi_smr), 2190 ("%s: not in SMR read section", __func__)); 2191 2192 head = &pcbinfo->ipi_hash_wild[INP_PCBHASH_WILD(lport, 2193 pcbinfo->ipi_hashmask)]; 2194 CK_LIST_FOREACH(inp, head, inp_hash_wild) { 2195 inp_lookup_match_t match; 2196 2197 match = in_pcblookup_wild_match(inp, laddr, lport); 2198 if (match == INPLOOKUP_MATCH_NONE) 2199 continue; 2200 2201 if (__predict_true(inp_smr_lock(inp, lockflags))) { 2202 match = in_pcblookup_wild_match(inp, laddr, lport); 2203 if (match != INPLOOKUP_MATCH_NONE && 2204 prison_check_ip4_locked(inp->inp_cred->cr_prison, 2205 &laddr) == 0) 2206 return (inp); 2207 inp_unlock(inp, lockflags); 2208 } 2209 2210 /* 2211 * The matching socket disappeared out from under us. Fall back 2212 * to a serialized lookup. 2213 */ 2214 return (INP_LOOKUP_AGAIN); 2215 } 2216 return (NULL); 2217 } 2218 2219 static struct inpcb * 2220 in_pcblookup_hash_wild_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr, 2221 u_short fport, struct in_addr laddr, u_short lport) 2222 { 2223 struct inpcbhead *head; 2224 struct inpcb *inp, *local_wild, *local_exact, *jail_wild; 2225 #ifdef INET6 2226 struct inpcb *local_wild_mapped; 2227 #endif 2228 2229 INP_HASH_LOCK_ASSERT(pcbinfo); 2230 2231 /* 2232 * Order of socket selection - we always prefer jails. 2233 * 1. jailed, non-wild. 2234 * 2. jailed, wild. 2235 * 3. non-jailed, non-wild. 2236 * 4. non-jailed, wild. 2237 */ 2238 head = &pcbinfo->ipi_hash_wild[INP_PCBHASH_WILD(lport, 2239 pcbinfo->ipi_hashmask)]; 2240 local_wild = local_exact = jail_wild = NULL; 2241 #ifdef INET6 2242 local_wild_mapped = NULL; 2243 #endif 2244 CK_LIST_FOREACH(inp, head, inp_hash_wild) { 2245 inp_lookup_match_t match; 2246 bool injail; 2247 2248 match = in_pcblookup_wild_match(inp, laddr, lport); 2249 if (match == INPLOOKUP_MATCH_NONE) 2250 continue; 2251 2252 injail = prison_flag(inp->inp_cred, PR_IP4) != 0; 2253 if (injail) { 2254 if (prison_check_ip4_locked(inp->inp_cred->cr_prison, 2255 &laddr) != 0) 2256 continue; 2257 } else { 2258 if (local_exact != NULL) 2259 continue; 2260 } 2261 2262 if (match == INPLOOKUP_MATCH_LADDR) { 2263 if (injail) 2264 return (inp); 2265 local_exact = inp; 2266 } else { 2267 #ifdef INET6 2268 /* XXX inp locking, NULL check */ 2269 if (inp->inp_vflag & INP_IPV6PROTO) 2270 local_wild_mapped = inp; 2271 else 2272 #endif 2273 if (injail) 2274 jail_wild = inp; 2275 else 2276 local_wild = inp; 2277 } 2278 } 2279 if (jail_wild != NULL) 2280 return (jail_wild); 2281 if (local_exact != NULL) 2282 return (local_exact); 2283 if (local_wild != NULL) 2284 return (local_wild); 2285 #ifdef INET6 2286 if (local_wild_mapped != NULL) 2287 return (local_wild_mapped); 2288 #endif 2289 return (NULL); 2290 } 2291 2292 /* 2293 * Lookup PCB in hash list, using pcbinfo tables. This variation assumes 2294 * that the caller has either locked the hash list, which usually happens 2295 * for bind(2) operations, or is in SMR section, which happens when sorting 2296 * out incoming packets. 2297 */ 2298 static struct inpcb * 2299 in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr, 2300 u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags, 2301 uint8_t numa_domain) 2302 { 2303 struct inpcb *inp; 2304 const u_short fport = fport_arg, lport = lport_arg; 2305 2306 KASSERT((lookupflags & ~INPLOOKUP_WILDCARD) == 0, 2307 ("%s: invalid lookup flags %d", __func__, lookupflags)); 2308 KASSERT(faddr.s_addr != INADDR_ANY, 2309 ("%s: invalid foreign address", __func__)); 2310 KASSERT(laddr.s_addr != INADDR_ANY, 2311 ("%s: invalid local address", __func__)); 2312 INP_HASH_WLOCK_ASSERT(pcbinfo); 2313 2314 inp = in_pcblookup_hash_exact(pcbinfo, faddr, fport, laddr, lport); 2315 if (inp != NULL) 2316 return (inp); 2317 2318 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 2319 inp = in_pcblookup_lbgroup(pcbinfo, &faddr, fport, 2320 &laddr, lport, numa_domain); 2321 if (inp == NULL) { 2322 inp = in_pcblookup_hash_wild_locked(pcbinfo, faddr, 2323 fport, laddr, lport); 2324 } 2325 } 2326 2327 return (inp); 2328 } 2329 2330 static struct inpcb * 2331 in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr, 2332 u_int fport, struct in_addr laddr, u_int lport, int lookupflags, 2333 uint8_t numa_domain) 2334 { 2335 struct inpcb *inp; 2336 const inp_lookup_t lockflags = lookupflags & INPLOOKUP_LOCKMASK; 2337 2338 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0, 2339 ("%s: LOCKPCB not set", __func__)); 2340 2341 INP_HASH_WLOCK(pcbinfo); 2342 inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport, 2343 lookupflags & ~INPLOOKUP_LOCKMASK, numa_domain); 2344 if (inp != NULL && !inp_trylock(inp, lockflags)) { 2345 in_pcbref(inp); 2346 INP_HASH_WUNLOCK(pcbinfo); 2347 inp_lock(inp, lockflags); 2348 if (in_pcbrele(inp, lockflags)) 2349 /* XXX-MJ or retry until we get a negative match? */ 2350 inp = NULL; 2351 } else { 2352 INP_HASH_WUNLOCK(pcbinfo); 2353 } 2354 return (inp); 2355 } 2356 2357 static struct inpcb * 2358 in_pcblookup_hash_smr(struct inpcbinfo *pcbinfo, struct in_addr faddr, 2359 u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags, 2360 uint8_t numa_domain) 2361 { 2362 struct inpcb *inp; 2363 const inp_lookup_t lockflags = lookupflags & INPLOOKUP_LOCKMASK; 2364 const u_short fport = fport_arg, lport = lport_arg; 2365 2366 KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0, 2367 ("%s: invalid lookup flags %d", __func__, lookupflags)); 2368 KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0, 2369 ("%s: LOCKPCB not set", __func__)); 2370 2371 smr_enter(pcbinfo->ipi_smr); 2372 inp = in_pcblookup_hash_exact(pcbinfo, faddr, fport, laddr, lport); 2373 if (inp != NULL) { 2374 if (__predict_true(inp_smr_lock(inp, lockflags))) { 2375 /* 2376 * Revalidate the 4-tuple, the socket could have been 2377 * disconnected. 2378 */ 2379 if (__predict_true(in_pcblookup_exact_match(inp, 2380 faddr, fport, laddr, lport))) 2381 return (inp); 2382 inp_unlock(inp, lockflags); 2383 } 2384 2385 /* 2386 * We failed to lock the inpcb, or its connection state changed 2387 * out from under us. Fall back to a precise search. 2388 */ 2389 return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport, 2390 lookupflags, numa_domain)); 2391 } 2392 2393 if ((lookupflags & INPLOOKUP_WILDCARD) != 0) { 2394 inp = in_pcblookup_lbgroup(pcbinfo, &faddr, fport, 2395 &laddr, lport, numa_domain); 2396 if (inp != NULL) { 2397 if (__predict_true(inp_smr_lock(inp, lockflags))) { 2398 if (__predict_true(in_pcblookup_wild_match(inp, 2399 laddr, lport) != INPLOOKUP_MATCH_NONE)) 2400 return (inp); 2401 inp_unlock(inp, lockflags); 2402 } 2403 inp = INP_LOOKUP_AGAIN; 2404 } else { 2405 inp = in_pcblookup_hash_wild_smr(pcbinfo, faddr, fport, 2406 laddr, lport, lockflags); 2407 } 2408 if (inp == INP_LOOKUP_AGAIN) { 2409 return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, 2410 lport, lookupflags, numa_domain)); 2411 } 2412 } 2413 2414 if (inp == NULL) 2415 smr_exit(pcbinfo->ipi_smr); 2416 2417 return (inp); 2418 } 2419 2420 /* 2421 * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf 2422 * from which a pre-calculated hash value may be extracted. 2423 */ 2424 struct inpcb * 2425 in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport, 2426 struct in_addr laddr, u_int lport, int lookupflags, 2427 struct ifnet *ifp __unused) 2428 { 2429 return (in_pcblookup_hash_smr(pcbinfo, faddr, fport, laddr, lport, 2430 lookupflags, M_NODOM)); 2431 } 2432 2433 struct inpcb * 2434 in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr, 2435 u_int fport, struct in_addr laddr, u_int lport, int lookupflags, 2436 struct ifnet *ifp __unused, struct mbuf *m) 2437 { 2438 return (in_pcblookup_hash_smr(pcbinfo, faddr, fport, laddr, lport, 2439 lookupflags, m->m_pkthdr.numa_domain)); 2440 } 2441 #endif /* INET */ 2442 2443 static bool 2444 in_pcbjailed(const struct inpcb *inp, unsigned int flag) 2445 { 2446 return (prison_flag(inp->inp_cred, flag) != 0); 2447 } 2448 2449 /* 2450 * Insert the PCB into a hash chain using ordering rules which ensure that 2451 * in_pcblookup_hash_wild_*() always encounter the highest-ranking PCB first. 2452 * 2453 * Specifically, keep jailed PCBs in front of non-jailed PCBs, and keep PCBs 2454 * with exact local addresses ahead of wildcard PCBs. Unbound v4-mapped v6 PCBs 2455 * always appear last no matter whether they are jailed. 2456 */ 2457 static void 2458 _in_pcbinshash_wild(struct inpcbhead *pcbhash, struct inpcb *inp) 2459 { 2460 struct inpcb *last; 2461 bool bound, injail; 2462 2463 INP_LOCK_ASSERT(inp); 2464 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 2465 2466 last = NULL; 2467 bound = inp->inp_laddr.s_addr != INADDR_ANY; 2468 if (!bound && (inp->inp_vflag & INP_IPV6PROTO) != 0) { 2469 CK_LIST_FOREACH(last, pcbhash, inp_hash_wild) { 2470 if (CK_LIST_NEXT(last, inp_hash_wild) == NULL) { 2471 CK_LIST_INSERT_AFTER(last, inp, inp_hash_wild); 2472 return; 2473 } 2474 } 2475 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash_wild); 2476 return; 2477 } 2478 2479 injail = in_pcbjailed(inp, PR_IP4); 2480 if (!injail) { 2481 CK_LIST_FOREACH(last, pcbhash, inp_hash_wild) { 2482 if (!in_pcbjailed(last, PR_IP4)) 2483 break; 2484 if (CK_LIST_NEXT(last, inp_hash_wild) == NULL) { 2485 CK_LIST_INSERT_AFTER(last, inp, inp_hash_wild); 2486 return; 2487 } 2488 } 2489 } else if (!CK_LIST_EMPTY(pcbhash) && 2490 !in_pcbjailed(CK_LIST_FIRST(pcbhash), PR_IP4)) { 2491 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash_wild); 2492 return; 2493 } 2494 if (!bound) { 2495 CK_LIST_FOREACH_FROM(last, pcbhash, inp_hash_wild) { 2496 if (last->inp_laddr.s_addr == INADDR_ANY) 2497 break; 2498 if (CK_LIST_NEXT(last, inp_hash_wild) == NULL) { 2499 CK_LIST_INSERT_AFTER(last, inp, inp_hash_wild); 2500 return; 2501 } 2502 } 2503 } 2504 if (last == NULL) 2505 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash_wild); 2506 else 2507 CK_LIST_INSERT_BEFORE(last, inp, inp_hash_wild); 2508 } 2509 2510 #ifdef INET6 2511 /* 2512 * See the comment above _in_pcbinshash_wild(). 2513 */ 2514 static void 2515 _in6_pcbinshash_wild(struct inpcbhead *pcbhash, struct inpcb *inp) 2516 { 2517 struct inpcb *last; 2518 bool bound, injail; 2519 2520 INP_LOCK_ASSERT(inp); 2521 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 2522 2523 last = NULL; 2524 bound = !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr); 2525 injail = in_pcbjailed(inp, PR_IP6); 2526 if (!injail) { 2527 CK_LIST_FOREACH(last, pcbhash, inp_hash_wild) { 2528 if (!in_pcbjailed(last, PR_IP6)) 2529 break; 2530 if (CK_LIST_NEXT(last, inp_hash_wild) == NULL) { 2531 CK_LIST_INSERT_AFTER(last, inp, inp_hash_wild); 2532 return; 2533 } 2534 } 2535 } else if (!CK_LIST_EMPTY(pcbhash) && 2536 !in_pcbjailed(CK_LIST_FIRST(pcbhash), PR_IP6)) { 2537 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash_wild); 2538 return; 2539 } 2540 if (!bound) { 2541 CK_LIST_FOREACH_FROM(last, pcbhash, inp_hash_wild) { 2542 if (IN6_IS_ADDR_UNSPECIFIED(&last->in6p_laddr)) 2543 break; 2544 if (CK_LIST_NEXT(last, inp_hash_wild) == NULL) { 2545 CK_LIST_INSERT_AFTER(last, inp, inp_hash_wild); 2546 return; 2547 } 2548 } 2549 } 2550 if (last == NULL) 2551 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash_wild); 2552 else 2553 CK_LIST_INSERT_BEFORE(last, inp, inp_hash_wild); 2554 } 2555 #endif 2556 2557 /* 2558 * Insert PCB onto various hash lists. 2559 */ 2560 int 2561 in_pcbinshash(struct inpcb *inp) 2562 { 2563 struct inpcbhead *pcbhash; 2564 struct inpcbporthead *pcbporthash; 2565 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 2566 struct inpcbport *phd; 2567 uint32_t hash; 2568 bool connected; 2569 2570 INP_WLOCK_ASSERT(inp); 2571 INP_HASH_WLOCK_ASSERT(pcbinfo); 2572 KASSERT((inp->inp_flags & INP_INHASHLIST) == 0, 2573 ("in_pcbinshash: INP_INHASHLIST")); 2574 2575 #ifdef INET6 2576 if (inp->inp_vflag & INP_IPV6) { 2577 hash = INP6_PCBHASH(&inp->in6p_faddr, inp->inp_lport, 2578 inp->inp_fport, pcbinfo->ipi_hashmask); 2579 connected = !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr); 2580 } else 2581 #endif 2582 { 2583 hash = INP_PCBHASH(&inp->inp_faddr, inp->inp_lport, 2584 inp->inp_fport, pcbinfo->ipi_hashmask); 2585 connected = !in_nullhost(inp->inp_faddr); 2586 } 2587 2588 if (connected) 2589 pcbhash = &pcbinfo->ipi_hash_exact[hash]; 2590 else 2591 pcbhash = &pcbinfo->ipi_hash_wild[hash]; 2592 2593 pcbporthash = &pcbinfo->ipi_porthashbase[ 2594 INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)]; 2595 2596 /* 2597 * Add entry to load balance group. 2598 * Only do this if SO_REUSEPORT_LB is set. 2599 */ 2600 if ((inp->inp_socket->so_options & SO_REUSEPORT_LB) != 0) { 2601 int error = in_pcbinslbgrouphash(inp, M_NODOM); 2602 if (error != 0) 2603 return (error); 2604 } 2605 2606 /* 2607 * Go through port list and look for a head for this lport. 2608 */ 2609 CK_LIST_FOREACH(phd, pcbporthash, phd_hash) { 2610 if (phd->phd_port == inp->inp_lport) 2611 break; 2612 } 2613 2614 /* 2615 * If none exists, malloc one and tack it on. 2616 */ 2617 if (phd == NULL) { 2618 phd = uma_zalloc_smr(pcbinfo->ipi_portzone, M_NOWAIT); 2619 if (phd == NULL) { 2620 if ((inp->inp_flags & INP_INLBGROUP) != 0) 2621 in_pcbremlbgrouphash(inp); 2622 return (ENOMEM); 2623 } 2624 phd->phd_port = inp->inp_lport; 2625 CK_LIST_INIT(&phd->phd_pcblist); 2626 CK_LIST_INSERT_HEAD(pcbporthash, phd, phd_hash); 2627 } 2628 inp->inp_phd = phd; 2629 CK_LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist); 2630 2631 /* 2632 * The PCB may have been disconnected in the past. Before we can safely 2633 * make it visible in the hash table, we must wait for all readers which 2634 * may be traversing this PCB to finish. 2635 */ 2636 if (inp->inp_smr != SMR_SEQ_INVALID) { 2637 smr_wait(pcbinfo->ipi_smr, inp->inp_smr); 2638 inp->inp_smr = SMR_SEQ_INVALID; 2639 } 2640 2641 if (connected) 2642 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash_exact); 2643 else { 2644 #ifdef INET6 2645 if ((inp->inp_vflag & INP_IPV6) != 0) 2646 _in6_pcbinshash_wild(pcbhash, inp); 2647 else 2648 #endif 2649 _in_pcbinshash_wild(pcbhash, inp); 2650 } 2651 inp->inp_flags |= INP_INHASHLIST; 2652 2653 return (0); 2654 } 2655 2656 void 2657 in_pcbremhash_locked(struct inpcb *inp) 2658 { 2659 struct inpcbport *phd = inp->inp_phd; 2660 2661 INP_WLOCK_ASSERT(inp); 2662 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 2663 MPASS(inp->inp_flags & INP_INHASHLIST); 2664 2665 if ((inp->inp_flags & INP_INLBGROUP) != 0) 2666 in_pcbremlbgrouphash(inp); 2667 #ifdef INET6 2668 if (inp->inp_vflag & INP_IPV6) { 2669 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 2670 CK_LIST_REMOVE(inp, inp_hash_wild); 2671 else 2672 CK_LIST_REMOVE(inp, inp_hash_exact); 2673 } else 2674 #endif 2675 { 2676 if (in_nullhost(inp->inp_faddr)) 2677 CK_LIST_REMOVE(inp, inp_hash_wild); 2678 else 2679 CK_LIST_REMOVE(inp, inp_hash_exact); 2680 } 2681 CK_LIST_REMOVE(inp, inp_portlist); 2682 if (CK_LIST_FIRST(&phd->phd_pcblist) == NULL) { 2683 CK_LIST_REMOVE(phd, phd_hash); 2684 uma_zfree_smr(inp->inp_pcbinfo->ipi_portzone, phd); 2685 } 2686 inp->inp_flags &= ~INP_INHASHLIST; 2687 } 2688 2689 static void 2690 in_pcbremhash(struct inpcb *inp) 2691 { 2692 INP_HASH_WLOCK(inp->inp_pcbinfo); 2693 in_pcbremhash_locked(inp); 2694 INP_HASH_WUNLOCK(inp->inp_pcbinfo); 2695 } 2696 2697 /* 2698 * Move PCB to the proper hash bucket when { faddr, fport } have been 2699 * changed. NOTE: This does not handle the case of the lport changing (the 2700 * hashed port list would have to be updated as well), so the lport must 2701 * not change after in_pcbinshash() has been called. 2702 */ 2703 void 2704 in_pcbrehash(struct inpcb *inp) 2705 { 2706 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 2707 struct inpcbhead *head; 2708 uint32_t hash; 2709 bool connected; 2710 2711 INP_WLOCK_ASSERT(inp); 2712 INP_HASH_WLOCK_ASSERT(pcbinfo); 2713 KASSERT(inp->inp_flags & INP_INHASHLIST, 2714 ("%s: !INP_INHASHLIST", __func__)); 2715 KASSERT(inp->inp_smr == SMR_SEQ_INVALID, 2716 ("%s: inp was disconnected", __func__)); 2717 2718 #ifdef INET6 2719 if (inp->inp_vflag & INP_IPV6) { 2720 hash = INP6_PCBHASH(&inp->in6p_faddr, inp->inp_lport, 2721 inp->inp_fport, pcbinfo->ipi_hashmask); 2722 connected = !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr); 2723 } else 2724 #endif 2725 { 2726 hash = INP_PCBHASH(&inp->inp_faddr, inp->inp_lport, 2727 inp->inp_fport, pcbinfo->ipi_hashmask); 2728 connected = !in_nullhost(inp->inp_faddr); 2729 } 2730 2731 /* 2732 * When rehashing, the caller must ensure that either the new or the old 2733 * foreign address was unspecified. 2734 */ 2735 if (connected) 2736 CK_LIST_REMOVE(inp, inp_hash_wild); 2737 else 2738 CK_LIST_REMOVE(inp, inp_hash_exact); 2739 2740 if (connected) { 2741 head = &pcbinfo->ipi_hash_exact[hash]; 2742 CK_LIST_INSERT_HEAD(head, inp, inp_hash_exact); 2743 } else { 2744 head = &pcbinfo->ipi_hash_wild[hash]; 2745 CK_LIST_INSERT_HEAD(head, inp, inp_hash_wild); 2746 } 2747 } 2748 2749 /* 2750 * Check for alternatives when higher level complains 2751 * about service problems. For now, invalidate cached 2752 * routing information. If the route was created dynamically 2753 * (by a redirect), time to try a default gateway again. 2754 */ 2755 void 2756 in_losing(struct inpcb *inp) 2757 { 2758 2759 RO_INVALIDATE_CACHE(&inp->inp_route); 2760 return; 2761 } 2762 2763 /* 2764 * A set label operation has occurred at the socket layer, propagate the 2765 * label change into the in_pcb for the socket. 2766 */ 2767 void 2768 in_pcbsosetlabel(struct socket *so) 2769 { 2770 #ifdef MAC 2771 struct inpcb *inp; 2772 2773 inp = sotoinpcb(so); 2774 KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL")); 2775 2776 INP_WLOCK(inp); 2777 SOCK_LOCK(so); 2778 mac_inpcb_sosetlabel(so, inp); 2779 SOCK_UNLOCK(so); 2780 INP_WUNLOCK(inp); 2781 #endif 2782 } 2783 2784 void 2785 inp_wlock(struct inpcb *inp) 2786 { 2787 2788 INP_WLOCK(inp); 2789 } 2790 2791 void 2792 inp_wunlock(struct inpcb *inp) 2793 { 2794 2795 INP_WUNLOCK(inp); 2796 } 2797 2798 void 2799 inp_rlock(struct inpcb *inp) 2800 { 2801 2802 INP_RLOCK(inp); 2803 } 2804 2805 void 2806 inp_runlock(struct inpcb *inp) 2807 { 2808 2809 INP_RUNLOCK(inp); 2810 } 2811 2812 #ifdef INVARIANT_SUPPORT 2813 void 2814 inp_lock_assert(struct inpcb *inp) 2815 { 2816 2817 INP_WLOCK_ASSERT(inp); 2818 } 2819 2820 void 2821 inp_unlock_assert(struct inpcb *inp) 2822 { 2823 2824 INP_UNLOCK_ASSERT(inp); 2825 } 2826 #endif 2827 2828 void 2829 inp_apply_all(struct inpcbinfo *pcbinfo, 2830 void (*func)(struct inpcb *, void *), void *arg) 2831 { 2832 struct inpcb_iterator inpi = INP_ALL_ITERATOR(pcbinfo, 2833 INPLOOKUP_WLOCKPCB); 2834 struct inpcb *inp; 2835 2836 while ((inp = inp_next(&inpi)) != NULL) 2837 func(inp, arg); 2838 } 2839 2840 struct socket * 2841 inp_inpcbtosocket(struct inpcb *inp) 2842 { 2843 2844 INP_WLOCK_ASSERT(inp); 2845 return (inp->inp_socket); 2846 } 2847 2848 void 2849 inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp, 2850 uint32_t *faddr, uint16_t *fp) 2851 { 2852 2853 INP_LOCK_ASSERT(inp); 2854 *laddr = inp->inp_laddr.s_addr; 2855 *faddr = inp->inp_faddr.s_addr; 2856 *lp = inp->inp_lport; 2857 *fp = inp->inp_fport; 2858 } 2859 2860 /* 2861 * Create an external-format (``xinpcb'') structure using the information in 2862 * the kernel-format in_pcb structure pointed to by inp. This is done to 2863 * reduce the spew of irrelevant information over this interface, to isolate 2864 * user code from changes in the kernel structure, and potentially to provide 2865 * information-hiding if we decide that some of this information should be 2866 * hidden from users. 2867 */ 2868 void 2869 in_pcbtoxinpcb(const struct inpcb *inp, struct xinpcb *xi) 2870 { 2871 2872 bzero(xi, sizeof(*xi)); 2873 xi->xi_len = sizeof(struct xinpcb); 2874 if (inp->inp_socket) 2875 sotoxsocket(inp->inp_socket, &xi->xi_socket); 2876 bcopy(&inp->inp_inc, &xi->inp_inc, sizeof(struct in_conninfo)); 2877 xi->inp_gencnt = inp->inp_gencnt; 2878 xi->inp_flow = inp->inp_flow; 2879 xi->inp_flowid = inp->inp_flowid; 2880 xi->inp_flowtype = inp->inp_flowtype; 2881 xi->inp_flags = inp->inp_flags; 2882 xi->inp_flags2 = inp->inp_flags2; 2883 xi->in6p_cksum = inp->in6p_cksum; 2884 xi->in6p_hops = inp->in6p_hops; 2885 xi->inp_ip_tos = inp->inp_ip_tos; 2886 xi->inp_vflag = inp->inp_vflag; 2887 xi->inp_ip_ttl = inp->inp_ip_ttl; 2888 xi->inp_ip_p = inp->inp_ip_p; 2889 xi->inp_ip_minttl = inp->inp_ip_minttl; 2890 } 2891 2892 int 2893 sysctl_setsockopt(SYSCTL_HANDLER_ARGS, struct inpcbinfo *pcbinfo, 2894 int (*ctloutput_set)(struct inpcb *, struct sockopt *)) 2895 { 2896 struct sockopt sopt; 2897 struct inpcb_iterator inpi = INP_ALL_ITERATOR(pcbinfo, 2898 INPLOOKUP_WLOCKPCB); 2899 struct inpcb *inp; 2900 struct sockopt_parameters *params; 2901 struct socket *so; 2902 int error; 2903 char buf[1024]; 2904 2905 if (req->oldptr != NULL || req->oldlen != 0) 2906 return (EINVAL); 2907 if (req->newptr == NULL) 2908 return (EPERM); 2909 if (req->newlen > sizeof(buf)) 2910 return (ENOMEM); 2911 error = SYSCTL_IN(req, buf, req->newlen); 2912 if (error != 0) 2913 return (error); 2914 if (req->newlen < sizeof(struct sockopt_parameters)) 2915 return (EINVAL); 2916 params = (struct sockopt_parameters *)buf; 2917 sopt.sopt_level = params->sop_level; 2918 sopt.sopt_name = params->sop_optname; 2919 sopt.sopt_dir = SOPT_SET; 2920 sopt.sopt_val = params->sop_optval; 2921 sopt.sopt_valsize = req->newlen - sizeof(struct sockopt_parameters); 2922 sopt.sopt_td = NULL; 2923 #ifdef INET6 2924 if (params->sop_inc.inc_flags & INC_ISIPV6) { 2925 if (IN6_IS_SCOPE_LINKLOCAL(¶ms->sop_inc.inc6_laddr)) 2926 params->sop_inc.inc6_laddr.s6_addr16[1] = 2927 htons(params->sop_inc.inc6_zoneid & 0xffff); 2928 if (IN6_IS_SCOPE_LINKLOCAL(¶ms->sop_inc.inc6_faddr)) 2929 params->sop_inc.inc6_faddr.s6_addr16[1] = 2930 htons(params->sop_inc.inc6_zoneid & 0xffff); 2931 } 2932 #endif 2933 if (params->sop_inc.inc_lport != htons(0) && 2934 params->sop_inc.inc_fport != htons(0)) { 2935 #ifdef INET6 2936 if (params->sop_inc.inc_flags & INC_ISIPV6) 2937 inpi.hash = INP6_PCBHASH( 2938 ¶ms->sop_inc.inc6_faddr, 2939 params->sop_inc.inc_lport, 2940 params->sop_inc.inc_fport, 2941 pcbinfo->ipi_hashmask); 2942 else 2943 #endif 2944 inpi.hash = INP_PCBHASH( 2945 ¶ms->sop_inc.inc_faddr, 2946 params->sop_inc.inc_lport, 2947 params->sop_inc.inc_fport, 2948 pcbinfo->ipi_hashmask); 2949 } 2950 while ((inp = inp_next(&inpi)) != NULL) 2951 if (inp->inp_gencnt == params->sop_id) { 2952 if (inp->inp_flags & INP_DROPPED) { 2953 INP_WUNLOCK(inp); 2954 return (ECONNRESET); 2955 } 2956 so = inp->inp_socket; 2957 KASSERT(so != NULL, ("inp_socket == NULL")); 2958 soref(so); 2959 if (params->sop_level == SOL_SOCKET) { 2960 INP_WUNLOCK(inp); 2961 error = sosetopt(so, &sopt); 2962 } else 2963 error = (*ctloutput_set)(inp, &sopt); 2964 sorele(so); 2965 break; 2966 } 2967 if (inp == NULL) 2968 error = ESRCH; 2969 return (error); 2970 } 2971 2972 #ifdef DDB 2973 static void 2974 db_print_indent(int indent) 2975 { 2976 int i; 2977 2978 for (i = 0; i < indent; i++) 2979 db_printf(" "); 2980 } 2981 2982 static void 2983 db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent) 2984 { 2985 char faddr_str[48], laddr_str[48]; 2986 2987 db_print_indent(indent); 2988 db_printf("%s at %p\n", name, inc); 2989 2990 indent += 2; 2991 2992 #ifdef INET6 2993 if (inc->inc_flags & INC_ISIPV6) { 2994 /* IPv6. */ 2995 ip6_sprintf(laddr_str, &inc->inc6_laddr); 2996 ip6_sprintf(faddr_str, &inc->inc6_faddr); 2997 } else 2998 #endif 2999 { 3000 /* IPv4. */ 3001 inet_ntoa_r(inc->inc_laddr, laddr_str); 3002 inet_ntoa_r(inc->inc_faddr, faddr_str); 3003 } 3004 db_print_indent(indent); 3005 db_printf("inc_laddr %s inc_lport %u\n", laddr_str, 3006 ntohs(inc->inc_lport)); 3007 db_print_indent(indent); 3008 db_printf("inc_faddr %s inc_fport %u\n", faddr_str, 3009 ntohs(inc->inc_fport)); 3010 } 3011 3012 static void 3013 db_print_inpflags(int inp_flags) 3014 { 3015 int comma; 3016 3017 comma = 0; 3018 if (inp_flags & INP_RECVOPTS) { 3019 db_printf("%sINP_RECVOPTS", comma ? ", " : ""); 3020 comma = 1; 3021 } 3022 if (inp_flags & INP_RECVRETOPTS) { 3023 db_printf("%sINP_RECVRETOPTS", comma ? ", " : ""); 3024 comma = 1; 3025 } 3026 if (inp_flags & INP_RECVDSTADDR) { 3027 db_printf("%sINP_RECVDSTADDR", comma ? ", " : ""); 3028 comma = 1; 3029 } 3030 if (inp_flags & INP_ORIGDSTADDR) { 3031 db_printf("%sINP_ORIGDSTADDR", comma ? ", " : ""); 3032 comma = 1; 3033 } 3034 if (inp_flags & INP_HDRINCL) { 3035 db_printf("%sINP_HDRINCL", comma ? ", " : ""); 3036 comma = 1; 3037 } 3038 if (inp_flags & INP_HIGHPORT) { 3039 db_printf("%sINP_HIGHPORT", comma ? ", " : ""); 3040 comma = 1; 3041 } 3042 if (inp_flags & INP_LOWPORT) { 3043 db_printf("%sINP_LOWPORT", comma ? ", " : ""); 3044 comma = 1; 3045 } 3046 if (inp_flags & INP_ANONPORT) { 3047 db_printf("%sINP_ANONPORT", comma ? ", " : ""); 3048 comma = 1; 3049 } 3050 if (inp_flags & INP_RECVIF) { 3051 db_printf("%sINP_RECVIF", comma ? ", " : ""); 3052 comma = 1; 3053 } 3054 if (inp_flags & INP_MTUDISC) { 3055 db_printf("%sINP_MTUDISC", comma ? ", " : ""); 3056 comma = 1; 3057 } 3058 if (inp_flags & INP_RECVTTL) { 3059 db_printf("%sINP_RECVTTL", comma ? ", " : ""); 3060 comma = 1; 3061 } 3062 if (inp_flags & INP_DONTFRAG) { 3063 db_printf("%sINP_DONTFRAG", comma ? ", " : ""); 3064 comma = 1; 3065 } 3066 if (inp_flags & INP_RECVTOS) { 3067 db_printf("%sINP_RECVTOS", comma ? ", " : ""); 3068 comma = 1; 3069 } 3070 if (inp_flags & IN6P_IPV6_V6ONLY) { 3071 db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : ""); 3072 comma = 1; 3073 } 3074 if (inp_flags & IN6P_PKTINFO) { 3075 db_printf("%sIN6P_PKTINFO", comma ? ", " : ""); 3076 comma = 1; 3077 } 3078 if (inp_flags & IN6P_HOPLIMIT) { 3079 db_printf("%sIN6P_HOPLIMIT", comma ? ", " : ""); 3080 comma = 1; 3081 } 3082 if (inp_flags & IN6P_HOPOPTS) { 3083 db_printf("%sIN6P_HOPOPTS", comma ? ", " : ""); 3084 comma = 1; 3085 } 3086 if (inp_flags & IN6P_DSTOPTS) { 3087 db_printf("%sIN6P_DSTOPTS", comma ? ", " : ""); 3088 comma = 1; 3089 } 3090 if (inp_flags & IN6P_RTHDR) { 3091 db_printf("%sIN6P_RTHDR", comma ? ", " : ""); 3092 comma = 1; 3093 } 3094 if (inp_flags & IN6P_RTHDRDSTOPTS) { 3095 db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : ""); 3096 comma = 1; 3097 } 3098 if (inp_flags & IN6P_TCLASS) { 3099 db_printf("%sIN6P_TCLASS", comma ? ", " : ""); 3100 comma = 1; 3101 } 3102 if (inp_flags & IN6P_AUTOFLOWLABEL) { 3103 db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : ""); 3104 comma = 1; 3105 } 3106 if (inp_flags & INP_ONESBCAST) { 3107 db_printf("%sINP_ONESBCAST", comma ? ", " : ""); 3108 comma = 1; 3109 } 3110 if (inp_flags & INP_DROPPED) { 3111 db_printf("%sINP_DROPPED", comma ? ", " : ""); 3112 comma = 1; 3113 } 3114 if (inp_flags & INP_SOCKREF) { 3115 db_printf("%sINP_SOCKREF", comma ? ", " : ""); 3116 comma = 1; 3117 } 3118 if (inp_flags & IN6P_RFC2292) { 3119 db_printf("%sIN6P_RFC2292", comma ? ", " : ""); 3120 comma = 1; 3121 } 3122 if (inp_flags & IN6P_MTU) { 3123 db_printf("IN6P_MTU%s", comma ? ", " : ""); 3124 comma = 1; 3125 } 3126 } 3127 3128 static void 3129 db_print_inpvflag(u_char inp_vflag) 3130 { 3131 int comma; 3132 3133 comma = 0; 3134 if (inp_vflag & INP_IPV4) { 3135 db_printf("%sINP_IPV4", comma ? ", " : ""); 3136 comma = 1; 3137 } 3138 if (inp_vflag & INP_IPV6) { 3139 db_printf("%sINP_IPV6", comma ? ", " : ""); 3140 comma = 1; 3141 } 3142 if (inp_vflag & INP_IPV6PROTO) { 3143 db_printf("%sINP_IPV6PROTO", comma ? ", " : ""); 3144 comma = 1; 3145 } 3146 } 3147 3148 static void 3149 db_print_inpcb(struct inpcb *inp, const char *name, int indent) 3150 { 3151 3152 db_print_indent(indent); 3153 db_printf("%s at %p\n", name, inp); 3154 3155 indent += 2; 3156 3157 db_print_indent(indent); 3158 db_printf("inp_flow: 0x%x\n", inp->inp_flow); 3159 3160 db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent); 3161 3162 db_print_indent(indent); 3163 db_printf("inp_label: %p inp_flags: 0x%x (", 3164 inp->inp_label, inp->inp_flags); 3165 db_print_inpflags(inp->inp_flags); 3166 db_printf(")\n"); 3167 3168 db_print_indent(indent); 3169 db_printf("inp_sp: %p inp_vflag: 0x%x (", inp->inp_sp, 3170 inp->inp_vflag); 3171 db_print_inpvflag(inp->inp_vflag); 3172 db_printf(")\n"); 3173 3174 db_print_indent(indent); 3175 db_printf("inp_ip_ttl: %d inp_ip_p: %d inp_ip_minttl: %d\n", 3176 inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl); 3177 3178 db_print_indent(indent); 3179 #ifdef INET6 3180 if (inp->inp_vflag & INP_IPV6) { 3181 db_printf("in6p_options: %p in6p_outputopts: %p " 3182 "in6p_moptions: %p\n", inp->in6p_options, 3183 inp->in6p_outputopts, inp->in6p_moptions); 3184 db_printf("in6p_icmp6filt: %p in6p_cksum %d " 3185 "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum, 3186 inp->in6p_hops); 3187 } else 3188 #endif 3189 { 3190 db_printf("inp_ip_tos: %d inp_ip_options: %p " 3191 "inp_ip_moptions: %p\n", inp->inp_ip_tos, 3192 inp->inp_options, inp->inp_moptions); 3193 } 3194 3195 db_print_indent(indent); 3196 db_printf("inp_phd: %p inp_gencnt: %ju\n", inp->inp_phd, 3197 (uintmax_t)inp->inp_gencnt); 3198 } 3199 3200 DB_SHOW_COMMAND(inpcb, db_show_inpcb) 3201 { 3202 struct inpcb *inp; 3203 3204 if (!have_addr) { 3205 db_printf("usage: show inpcb <addr>\n"); 3206 return; 3207 } 3208 inp = (struct inpcb *)addr; 3209 3210 db_print_inpcb(inp, "inpcb", 0); 3211 } 3212 #endif /* DDB */ 3213 3214 #ifdef RATELIMIT 3215 /* 3216 * Modify TX rate limit based on the existing "inp->inp_snd_tag", 3217 * if any. 3218 */ 3219 int 3220 in_pcbmodify_txrtlmt(struct inpcb *inp, uint32_t max_pacing_rate) 3221 { 3222 union if_snd_tag_modify_params params = { 3223 .rate_limit.max_rate = max_pacing_rate, 3224 .rate_limit.flags = M_NOWAIT, 3225 }; 3226 struct m_snd_tag *mst; 3227 int error; 3228 3229 mst = inp->inp_snd_tag; 3230 if (mst == NULL) 3231 return (EINVAL); 3232 3233 if (mst->sw->snd_tag_modify == NULL) { 3234 error = EOPNOTSUPP; 3235 } else { 3236 error = mst->sw->snd_tag_modify(mst, ¶ms); 3237 } 3238 return (error); 3239 } 3240 3241 /* 3242 * Query existing TX rate limit based on the existing 3243 * "inp->inp_snd_tag", if any. 3244 */ 3245 int 3246 in_pcbquery_txrtlmt(struct inpcb *inp, uint32_t *p_max_pacing_rate) 3247 { 3248 union if_snd_tag_query_params params = { }; 3249 struct m_snd_tag *mst; 3250 int error; 3251 3252 mst = inp->inp_snd_tag; 3253 if (mst == NULL) 3254 return (EINVAL); 3255 3256 if (mst->sw->snd_tag_query == NULL) { 3257 error = EOPNOTSUPP; 3258 } else { 3259 error = mst->sw->snd_tag_query(mst, ¶ms); 3260 if (error == 0 && p_max_pacing_rate != NULL) 3261 *p_max_pacing_rate = params.rate_limit.max_rate; 3262 } 3263 return (error); 3264 } 3265 3266 /* 3267 * Query existing TX queue level based on the existing 3268 * "inp->inp_snd_tag", if any. 3269 */ 3270 int 3271 in_pcbquery_txrlevel(struct inpcb *inp, uint32_t *p_txqueue_level) 3272 { 3273 union if_snd_tag_query_params params = { }; 3274 struct m_snd_tag *mst; 3275 int error; 3276 3277 mst = inp->inp_snd_tag; 3278 if (mst == NULL) 3279 return (EINVAL); 3280 3281 if (mst->sw->snd_tag_query == NULL) 3282 return (EOPNOTSUPP); 3283 3284 error = mst->sw->snd_tag_query(mst, ¶ms); 3285 if (error == 0 && p_txqueue_level != NULL) 3286 *p_txqueue_level = params.rate_limit.queue_level; 3287 return (error); 3288 } 3289 3290 /* 3291 * Allocate a new TX rate limit send tag from the network interface 3292 * given by the "ifp" argument and save it in "inp->inp_snd_tag": 3293 */ 3294 int 3295 in_pcbattach_txrtlmt(struct inpcb *inp, struct ifnet *ifp, 3296 uint32_t flowtype, uint32_t flowid, uint32_t max_pacing_rate, struct m_snd_tag **st) 3297 3298 { 3299 union if_snd_tag_alloc_params params = { 3300 .rate_limit.hdr.type = (max_pacing_rate == -1U) ? 3301 IF_SND_TAG_TYPE_UNLIMITED : IF_SND_TAG_TYPE_RATE_LIMIT, 3302 .rate_limit.hdr.flowid = flowid, 3303 .rate_limit.hdr.flowtype = flowtype, 3304 .rate_limit.hdr.numa_domain = inp->inp_numa_domain, 3305 .rate_limit.max_rate = max_pacing_rate, 3306 .rate_limit.flags = M_NOWAIT, 3307 }; 3308 int error; 3309 3310 INP_WLOCK_ASSERT(inp); 3311 3312 /* 3313 * If there is already a send tag, or the INP is being torn 3314 * down, allocating a new send tag is not allowed. Else send 3315 * tags may leak. 3316 */ 3317 if (*st != NULL || (inp->inp_flags & INP_DROPPED) != 0) 3318 return (EINVAL); 3319 3320 error = m_snd_tag_alloc(ifp, ¶ms, st); 3321 #ifdef INET 3322 if (error == 0) { 3323 counter_u64_add(rate_limit_set_ok, 1); 3324 counter_u64_add(rate_limit_active, 1); 3325 } else if (error != EOPNOTSUPP) 3326 counter_u64_add(rate_limit_alloc_fail, 1); 3327 #endif 3328 return (error); 3329 } 3330 3331 void 3332 in_pcbdetach_tag(struct m_snd_tag *mst) 3333 { 3334 3335 m_snd_tag_rele(mst); 3336 #ifdef INET 3337 counter_u64_add(rate_limit_active, -1); 3338 #endif 3339 } 3340 3341 /* 3342 * Free an existing TX rate limit tag based on the "inp->inp_snd_tag", 3343 * if any: 3344 */ 3345 void 3346 in_pcbdetach_txrtlmt(struct inpcb *inp) 3347 { 3348 struct m_snd_tag *mst; 3349 3350 INP_WLOCK_ASSERT(inp); 3351 3352 mst = inp->inp_snd_tag; 3353 inp->inp_snd_tag = NULL; 3354 3355 if (mst == NULL) 3356 return; 3357 3358 m_snd_tag_rele(mst); 3359 #ifdef INET 3360 counter_u64_add(rate_limit_active, -1); 3361 #endif 3362 } 3363 3364 int 3365 in_pcboutput_txrtlmt_locked(struct inpcb *inp, struct ifnet *ifp, struct mbuf *mb, uint32_t max_pacing_rate) 3366 { 3367 int error; 3368 3369 /* 3370 * If the existing send tag is for the wrong interface due to 3371 * a route change, first drop the existing tag. Set the 3372 * CHANGED flag so that we will keep trying to allocate a new 3373 * tag if we fail to allocate one this time. 3374 */ 3375 if (inp->inp_snd_tag != NULL && inp->inp_snd_tag->ifp != ifp) { 3376 in_pcbdetach_txrtlmt(inp); 3377 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 3378 } 3379 3380 /* 3381 * NOTE: When attaching to a network interface a reference is 3382 * made to ensure the network interface doesn't go away until 3383 * all ratelimit connections are gone. The network interface 3384 * pointers compared below represent valid network interfaces, 3385 * except when comparing towards NULL. 3386 */ 3387 if (max_pacing_rate == 0 && inp->inp_snd_tag == NULL) { 3388 error = 0; 3389 } else if (!(ifp->if_capenable & IFCAP_TXRTLMT)) { 3390 if (inp->inp_snd_tag != NULL) 3391 in_pcbdetach_txrtlmt(inp); 3392 error = 0; 3393 } else if (inp->inp_snd_tag == NULL) { 3394 /* 3395 * In order to utilize packet pacing with RSS, we need 3396 * to wait until there is a valid RSS hash before we 3397 * can proceed: 3398 */ 3399 if (M_HASHTYPE_GET(mb) == M_HASHTYPE_NONE) { 3400 error = EAGAIN; 3401 } else { 3402 error = in_pcbattach_txrtlmt(inp, ifp, M_HASHTYPE_GET(mb), 3403 mb->m_pkthdr.flowid, max_pacing_rate, &inp->inp_snd_tag); 3404 } 3405 } else { 3406 error = in_pcbmodify_txrtlmt(inp, max_pacing_rate); 3407 } 3408 if (error == 0 || error == EOPNOTSUPP) 3409 inp->inp_flags2 &= ~INP_RATE_LIMIT_CHANGED; 3410 3411 return (error); 3412 } 3413 3414 /* 3415 * This function should be called when the INP_RATE_LIMIT_CHANGED flag 3416 * is set in the fast path and will attach/detach/modify the TX rate 3417 * limit send tag based on the socket's so_max_pacing_rate value. 3418 */ 3419 void 3420 in_pcboutput_txrtlmt(struct inpcb *inp, struct ifnet *ifp, struct mbuf *mb) 3421 { 3422 struct socket *socket; 3423 uint32_t max_pacing_rate; 3424 bool did_upgrade; 3425 3426 if (inp == NULL) 3427 return; 3428 3429 socket = inp->inp_socket; 3430 if (socket == NULL) 3431 return; 3432 3433 if (!INP_WLOCKED(inp)) { 3434 /* 3435 * NOTE: If the write locking fails, we need to bail 3436 * out and use the non-ratelimited ring for the 3437 * transmit until there is a new chance to get the 3438 * write lock. 3439 */ 3440 if (!INP_TRY_UPGRADE(inp)) 3441 return; 3442 did_upgrade = 1; 3443 } else { 3444 did_upgrade = 0; 3445 } 3446 3447 /* 3448 * NOTE: The so_max_pacing_rate value is read unlocked, 3449 * because atomic updates are not required since the variable 3450 * is checked at every mbuf we send. It is assumed that the 3451 * variable read itself will be atomic. 3452 */ 3453 max_pacing_rate = socket->so_max_pacing_rate; 3454 3455 in_pcboutput_txrtlmt_locked(inp, ifp, mb, max_pacing_rate); 3456 3457 if (did_upgrade) 3458 INP_DOWNGRADE(inp); 3459 } 3460 3461 /* 3462 * Track route changes for TX rate limiting. 3463 */ 3464 void 3465 in_pcboutput_eagain(struct inpcb *inp) 3466 { 3467 bool did_upgrade; 3468 3469 if (inp == NULL) 3470 return; 3471 3472 if (inp->inp_snd_tag == NULL) 3473 return; 3474 3475 if (!INP_WLOCKED(inp)) { 3476 /* 3477 * NOTE: If the write locking fails, we need to bail 3478 * out and use the non-ratelimited ring for the 3479 * transmit until there is a new chance to get the 3480 * write lock. 3481 */ 3482 if (!INP_TRY_UPGRADE(inp)) 3483 return; 3484 did_upgrade = 1; 3485 } else { 3486 did_upgrade = 0; 3487 } 3488 3489 /* detach rate limiting */ 3490 in_pcbdetach_txrtlmt(inp); 3491 3492 /* make sure new mbuf send tag allocation is made */ 3493 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 3494 3495 if (did_upgrade) 3496 INP_DOWNGRADE(inp); 3497 } 3498 3499 #ifdef INET 3500 static void 3501 rl_init(void *st) 3502 { 3503 rate_limit_new = counter_u64_alloc(M_WAITOK); 3504 rate_limit_chg = counter_u64_alloc(M_WAITOK); 3505 rate_limit_active = counter_u64_alloc(M_WAITOK); 3506 rate_limit_alloc_fail = counter_u64_alloc(M_WAITOK); 3507 rate_limit_set_ok = counter_u64_alloc(M_WAITOK); 3508 } 3509 3510 SYSINIT(rl, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, rl_init, NULL); 3511 #endif 3512 #endif /* RATELIMIT */ 3513