Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/uipc_domain.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)uipc_domain.c 8.2 (Berkeley) 10/18/93 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/socket.h> 39 #include <sys/protosw.h> 40 #include <sys/domain.h> 41 #include <sys/eventhandler.h> 42 #include <sys/epoch.h> 43 #include <sys/mbuf.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/mutex.h> 47 #include <sys/socketvar.h> 48 #include <sys/systm.h> 49 50 #include <net/vnet.h> 51 52 /* 53 * System initialization 54 * 55 * Note: domain initialization takes place on a per domain basis 56 * as a result of traversing a SYSINIT linker set. Most likely, 57 * each domain would want to call DOMAIN_SET(9) itself, which 58 * would cause the domain to be added just after domaininit() 59 * is called during startup. 60 * 61 * See DOMAIN_SET(9) for details on its use. 62 */ 63 64 static void domaininit(void *); 65 SYSINIT(domain, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, domaininit, NULL); 66 67 static void domainfinalize(void *); 68 SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize, 69 NULL); 70 71 static struct callout pffast_callout; 72 static struct callout pfslow_callout; 73 74 static void pffasttimo(void *); 75 static void pfslowtimo(void *); 76 77 struct domain *domains; /* registered protocol domains */ 78 int domain_init_status = 0; 79 static struct mtx dom_mtx; /* domain list lock */ 80 MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF); 81 82 /* 83 * Dummy protocol specific user requests function pointer array. 84 * All functions return EOPNOTSUPP. 85 */ 86 struct pr_usrreqs nousrreqs = { 87 .pru_accept = pru_accept_notsupp, 88 .pru_attach = pru_attach_notsupp, 89 .pru_bind = pru_bind_notsupp, 90 .pru_connect = pru_connect_notsupp, 91 .pru_connect2 = pru_connect2_notsupp, 92 .pru_control = pru_control_notsupp, 93 .pru_disconnect = pru_disconnect_notsupp, 94 .pru_listen = pru_listen_notsupp, 95 .pru_peeraddr = pru_peeraddr_notsupp, 96 .pru_rcvd = pru_rcvd_notsupp, 97 .pru_rcvoob = pru_rcvoob_notsupp, 98 .pru_send = pru_send_notsupp, 99 .pru_sense = pru_sense_null, 100 .pru_shutdown = pru_shutdown_notsupp, 101 .pru_sockaddr = pru_sockaddr_notsupp, 102 .pru_sosend = pru_sosend_notsupp, 103 .pru_soreceive = pru_soreceive_notsupp, 104 .pru_sopoll = pru_sopoll_notsupp, 105 }; 106 107 static void 108 protosw_init(struct protosw *pr) 109 { 110 struct pr_usrreqs *pu; 111 112 pu = pr->pr_usrreqs; 113 KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!", 114 pr->pr_domain->dom_name, 115 (int)(pr - pr->pr_domain->dom_protosw))); 116 117 /* 118 * Protocol switch methods fall into three categories: mandatory, 119 * mandatory but protosw_init() provides a default, and optional. 120 * 121 * For true protocols (i.e., pru_attach != NULL), KASSERT truly 122 * mandatory methods with no defaults, and initialize defaults for 123 * other mandatory methods if the protocol hasn't defined an 124 * implementation (NULL function pointer). 125 */ 126 #if 0 127 if (pu->pru_attach != NULL) { 128 KASSERT(pu->pru_abort != NULL, 129 ("protosw_init: %ssw[%d] pru_abort NULL", 130 pr->pr_domain->dom_name, 131 (int)(pr - pr->pr_domain->dom_protosw))); 132 KASSERT(pu->pru_send != NULL, 133 ("protosw_init: %ssw[%d] pru_send NULL", 134 pr->pr_domain->dom_name, 135 (int)(pr - pr->pr_domain->dom_protosw))); 136 } 137 #endif 138 139 #define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar) 140 DEFAULT(pu->pru_accept, pru_accept_notsupp); 141 DEFAULT(pu->pru_aio_queue, pru_aio_queue_notsupp); 142 DEFAULT(pu->pru_bind, pru_bind_notsupp); 143 DEFAULT(pu->pru_bindat, pru_bindat_notsupp); 144 DEFAULT(pu->pru_connect, pru_connect_notsupp); 145 DEFAULT(pu->pru_connect2, pru_connect2_notsupp); 146 DEFAULT(pu->pru_connectat, pru_connectat_notsupp); 147 DEFAULT(pu->pru_control, pru_control_notsupp); 148 DEFAULT(pu->pru_disconnect, pru_disconnect_notsupp); 149 DEFAULT(pu->pru_listen, pru_listen_notsupp); 150 DEFAULT(pu->pru_peeraddr, pru_peeraddr_notsupp); 151 DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp); 152 DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp); 153 DEFAULT(pu->pru_sense, pru_sense_null); 154 DEFAULT(pu->pru_shutdown, pru_shutdown_notsupp); 155 DEFAULT(pu->pru_sockaddr, pru_sockaddr_notsupp); 156 DEFAULT(pu->pru_sosend, sosend_generic); 157 DEFAULT(pu->pru_soreceive, soreceive_generic); 158 DEFAULT(pu->pru_sopoll, sopoll_generic); 159 DEFAULT(pu->pru_ready, pru_ready_notsupp); 160 #undef DEFAULT 161 if (pr->pr_init) 162 (*pr->pr_init)(); 163 } 164 165 /* 166 * Add a new protocol domain to the list of supported domains 167 * Note: you cant unload it again because a socket may be using it. 168 * XXX can't fail at this time. 169 */ 170 void 171 domain_init(void *arg) 172 { 173 struct domain *dp = arg; 174 struct protosw *pr; 175 176 if (dp->dom_init) 177 (*dp->dom_init)(); 178 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 179 protosw_init(pr); 180 /* 181 * update global information about maximums 182 */ 183 max_hdr = max_linkhdr + max_protohdr; 184 max_datalen = MHLEN - max_hdr; 185 if (max_datalen < 1) 186 panic("%s: max_datalen < 1", __func__); 187 } 188 189 #ifdef VIMAGE 190 void 191 vnet_domain_init(void *arg) 192 { 193 194 /* Virtualized case is no different -- call init functions. */ 195 domain_init(arg); 196 } 197 198 void 199 vnet_domain_uninit(void *arg) 200 { 201 struct domain *dp = arg; 202 203 if (dp->dom_destroy) 204 (*dp->dom_destroy)(); 205 } 206 #endif 207 208 /* 209 * Add a new protocol domain to the list of supported domains 210 * Note: you cant unload it again because a socket may be using it. 211 * XXX can't fail at this time. 212 */ 213 void 214 domain_add(void *data) 215 { 216 struct domain *dp; 217 218 dp = (struct domain *)data; 219 mtx_lock(&dom_mtx); 220 dp->dom_next = domains; 221 domains = dp; 222 223 KASSERT(domain_init_status >= 1, 224 ("attempt to domain_add(%s) before domaininit()", 225 dp->dom_name)); 226 #ifndef INVARIANTS 227 if (domain_init_status < 1) 228 printf("WARNING: attempt to domain_add(%s) before " 229 "domaininit()\n", dp->dom_name); 230 #endif 231 #ifdef notyet 232 KASSERT(domain_init_status < 2, 233 ("attempt to domain_add(%s) after domainfinalize()", 234 dp->dom_name)); 235 #else 236 if (domain_init_status >= 2) 237 printf("WARNING: attempt to domain_add(%s) after " 238 "domainfinalize()\n", dp->dom_name); 239 #endif 240 mtx_unlock(&dom_mtx); 241 } 242 243 /* ARGSUSED*/ 244 static void 245 domaininit(void *dummy) 246 { 247 248 if (max_linkhdr < 16) /* XXX */ 249 max_linkhdr = 16; 250 251 callout_init(&pffast_callout, 1); 252 callout_init(&pfslow_callout, 1); 253 254 mtx_lock(&dom_mtx); 255 KASSERT(domain_init_status == 0, ("domaininit called too late!")); 256 domain_init_status = 1; 257 mtx_unlock(&dom_mtx); 258 } 259 260 /* ARGSUSED*/ 261 static void 262 domainfinalize(void *dummy) 263 { 264 265 mtx_lock(&dom_mtx); 266 KASSERT(domain_init_status == 1, ("domainfinalize called too late!")); 267 domain_init_status = 2; 268 mtx_unlock(&dom_mtx); 269 270 callout_reset(&pffast_callout, 1, pffasttimo, NULL); 271 callout_reset(&pfslow_callout, 1, pfslowtimo, NULL); 272 } 273 274 struct domain * 275 pffinddomain(int family) 276 { 277 struct domain *dp; 278 279 for (dp = domains; dp != NULL; dp = dp->dom_next) 280 if (dp->dom_family == family) 281 return (dp); 282 return (NULL); 283 } 284 285 struct protosw * 286 pffindtype(int family, int type) 287 { 288 struct domain *dp; 289 struct protosw *pr; 290 291 dp = pffinddomain(family); 292 if (dp == NULL) 293 return (NULL); 294 295 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 296 if (pr->pr_type && pr->pr_type == type) 297 return (pr); 298 return (NULL); 299 } 300 301 struct protosw * 302 pffindproto(int family, int protocol, int type) 303 { 304 struct domain *dp; 305 struct protosw *pr; 306 struct protosw *maybe; 307 308 maybe = NULL; 309 if (family == 0) 310 return (NULL); 311 312 dp = pffinddomain(family); 313 if (dp == NULL) 314 return (NULL); 315 316 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 317 if ((pr->pr_protocol == protocol) && (pr->pr_type == type)) 318 return (pr); 319 320 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW && 321 pr->pr_protocol == 0 && maybe == NULL) 322 maybe = pr; 323 } 324 return (maybe); 325 } 326 327 /* 328 * The caller must make sure that the new protocol is fully set up and ready to 329 * accept requests before it is registered. 330 */ 331 int 332 pf_proto_register(int family, struct protosw *npr) 333 { 334 VNET_ITERATOR_DECL(vnet_iter); 335 struct domain *dp; 336 struct protosw *pr, *fpr; 337 338 /* Sanity checks. */ 339 if (family == 0) 340 return (EPFNOSUPPORT); 341 if (npr->pr_type == 0) 342 return (EPROTOTYPE); 343 if (npr->pr_protocol == 0) 344 return (EPROTONOSUPPORT); 345 if (npr->pr_usrreqs == NULL) 346 return (ENXIO); 347 348 /* Try to find the specified domain based on the family. */ 349 dp = pffinddomain(family); 350 if (dp == NULL) 351 return (EPFNOSUPPORT); 352 353 /* Initialize backpointer to struct domain. */ 354 npr->pr_domain = dp; 355 fpr = NULL; 356 357 /* 358 * Protect us against races when two protocol registrations for 359 * the same protocol happen at the same time. 360 */ 361 mtx_lock(&dom_mtx); 362 363 /* The new protocol must not yet exist. */ 364 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 365 if ((pr->pr_type == npr->pr_type) && 366 (pr->pr_protocol == npr->pr_protocol)) { 367 mtx_unlock(&dom_mtx); 368 return (EEXIST); /* XXX: Check only protocol? */ 369 } 370 /* While here, remember the first free spacer. */ 371 if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER)) 372 fpr = pr; 373 } 374 375 /* If no free spacer is found we can't add the new protocol. */ 376 if (fpr == NULL) { 377 mtx_unlock(&dom_mtx); 378 return (ENOMEM); 379 } 380 381 /* Copy the new struct protosw over the spacer. */ 382 bcopy(npr, fpr, sizeof(*fpr)); 383 384 /* Job is done, no more protection required. */ 385 mtx_unlock(&dom_mtx); 386 387 /* Initialize and activate the protocol. */ 388 VNET_LIST_RLOCK(); 389 VNET_FOREACH(vnet_iter) { 390 CURVNET_SET_QUIET(vnet_iter); 391 protosw_init(fpr); 392 CURVNET_RESTORE(); 393 } 394 VNET_LIST_RUNLOCK(); 395 396 return (0); 397 } 398 399 /* 400 * The caller must make sure the protocol and its functions correctly shut down 401 * all sockets and release all locks and memory references. 402 */ 403 int 404 pf_proto_unregister(int family, int protocol, int type) 405 { 406 struct domain *dp; 407 struct protosw *pr, *dpr; 408 409 /* Sanity checks. */ 410 if (family == 0) 411 return (EPFNOSUPPORT); 412 if (protocol == 0) 413 return (EPROTONOSUPPORT); 414 if (type == 0) 415 return (EPROTOTYPE); 416 417 /* Try to find the specified domain based on the family type. */ 418 dp = pffinddomain(family); 419 if (dp == NULL) 420 return (EPFNOSUPPORT); 421 422 dpr = NULL; 423 424 /* Lock out everyone else while we are manipulating the protosw. */ 425 mtx_lock(&dom_mtx); 426 427 /* The protocol must exist and only once. */ 428 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 429 if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) { 430 if (dpr != NULL) { 431 mtx_unlock(&dom_mtx); 432 return (EMLINK); /* Should not happen! */ 433 } else 434 dpr = pr; 435 } 436 } 437 438 /* Protocol does not exist. */ 439 if (dpr == NULL) { 440 mtx_unlock(&dom_mtx); 441 return (EPROTONOSUPPORT); 442 } 443 444 /* De-orbit the protocol and make the slot available again. */ 445 dpr->pr_type = 0; 446 dpr->pr_domain = dp; 447 dpr->pr_protocol = PROTO_SPACER; 448 dpr->pr_flags = 0; 449 dpr->pr_input = NULL; 450 dpr->pr_output = NULL; 451 dpr->pr_ctlinput = NULL; 452 dpr->pr_ctloutput = NULL; 453 dpr->pr_init = NULL; 454 dpr->pr_fasttimo = NULL; 455 dpr->pr_slowtimo = NULL; 456 dpr->pr_drain = NULL; 457 dpr->pr_usrreqs = &nousrreqs; 458 459 /* Job is done, not more protection required. */ 460 mtx_unlock(&dom_mtx); 461 462 return (0); 463 } 464 465 void 466 pfctlinput(int cmd, struct sockaddr *sa) 467 { 468 struct domain *dp; 469 struct protosw *pr; 470 471 for (dp = domains; dp; dp = dp->dom_next) 472 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 473 if (pr->pr_ctlinput) 474 (*pr->pr_ctlinput)(cmd, sa, (void *)0); 475 } 476 477 static void 478 pfslowtimo(void *arg) 479 { 480 struct epoch_tracker et; 481 struct domain *dp; 482 struct protosw *pr; 483 484 NET_EPOCH_ENTER(et); 485 for (dp = domains; dp; dp = dp->dom_next) 486 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 487 if (pr->pr_slowtimo) 488 (*pr->pr_slowtimo)(); 489 NET_EPOCH_EXIT(et); 490 callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL); 491 } 492 493 static void 494 pffasttimo(void *arg) 495 { 496 struct epoch_tracker et; 497 struct domain *dp; 498 struct protosw *pr; 499 500 NET_EPOCH_ENTER(et); 501 for (dp = domains; dp; dp = dp->dom_next) 502 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 503 if (pr->pr_fasttimo) 504 (*pr->pr_fasttimo)(); 505 NET_EPOCH_EXIT(et); 506 callout_reset(&pffast_callout, hz/5, pffasttimo, NULL); 507 }
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