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 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)uipc_domain.c 8.2 (Berkeley) 10/18/93 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/socket.h> 37 #include <sys/protosw.h> 38 #include <sys/domain.h> 39 #include <sys/eventhandler.h> 40 #include <sys/mbuf.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/mutex.h> 44 #include <sys/socketvar.h> 45 #include <sys/systm.h> 46 #include <vm/uma.h> 47 48 /* 49 * System initialization 50 * 51 * Note: domain initialization takes place on a per domain basis 52 * as a result of traversing a SYSINIT linker set. Most likely, 53 * each domain would want to call DOMAIN_SET(9) itself, which 54 * would cause the domain to be added just after domaininit() 55 * is called during startup. 56 * 57 * See DOMAIN_SET(9) for details on its use. 58 */ 59 60 static void domaininit(void *); 61 SYSINIT(domain, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, domaininit, NULL) 62 63 static void domainfinalize(void *); 64 SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize, 65 NULL) 66 67 static struct callout pffast_callout; 68 static struct callout pfslow_callout; 69 70 static void pffasttimo(void *); 71 static void pfslowtimo(void *); 72 73 struct domain *domains; /* registered protocol domains */ 74 int domain_init_status = 0; 75 struct mtx dom_mtx; /* domain list lock */ 76 MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF); 77 78 /* 79 * Dummy protocol specific user requests function pointer array. 80 * All functions return EOPNOTSUPP. 81 */ 82 struct pr_usrreqs nousrreqs = { 83 .pru_abort = pru_abort_notsupp, 84 .pru_accept = pru_accept_notsupp, 85 .pru_attach = pru_attach_notsupp, 86 .pru_bind = pru_bind_notsupp, 87 .pru_connect = pru_connect_notsupp, 88 .pru_connect2 = pru_connect2_notsupp, 89 .pru_control = pru_control_notsupp, 90 .pru_detach = pru_detach_notsupp, 91 .pru_disconnect = pru_disconnect_notsupp, 92 .pru_listen = pru_listen_notsupp, 93 .pru_peeraddr = pru_peeraddr_notsupp, 94 .pru_rcvd = pru_rcvd_notsupp, 95 .pru_rcvoob = pru_rcvoob_notsupp, 96 .pru_send = pru_send_notsupp, 97 .pru_sense = pru_sense_null, 98 .pru_shutdown = pru_shutdown_notsupp, 99 .pru_sockaddr = pru_sockaddr_notsupp, 100 .pru_sosend = pru_sosend_notsupp, 101 .pru_soreceive = pru_soreceive_notsupp, 102 .pru_sopoll = pru_sopoll_notsupp, 103 .pru_sosetlabel = pru_sosetlabel_null 104 }; 105 106 static void 107 protosw_init(struct protosw *pr) 108 { 109 struct pr_usrreqs *pu; 110 111 pu = pr->pr_usrreqs; 112 KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!", 113 pr->pr_domain->dom_name, 114 (int)(pr - pr->pr_domain->dom_protosw))); 115 116 #define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar) 117 DEFAULT(pu->pru_accept, pru_accept_notsupp); 118 DEFAULT(pu->pru_bind, pru_bind_notsupp); 119 DEFAULT(pu->pru_connect, pru_connect_notsupp); 120 DEFAULT(pu->pru_connect2, pru_connect2_notsupp); 121 DEFAULT(pu->pru_control, pru_control_notsupp); 122 DEFAULT(pu->pru_disconnect, pru_disconnect_notsupp); 123 DEFAULT(pu->pru_listen, pru_listen_notsupp); 124 DEFAULT(pu->pru_peeraddr, pru_peeraddr_notsupp); 125 DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp); 126 DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp); 127 DEFAULT(pu->pru_sense, pru_sense_null); 128 DEFAULT(pu->pru_shutdown, pru_shutdown_notsupp); 129 DEFAULT(pu->pru_sockaddr, pru_sockaddr_notsupp); 130 DEFAULT(pu->pru_sosend, sosend); 131 DEFAULT(pu->pru_soreceive, soreceive); 132 DEFAULT(pu->pru_sopoll, sopoll); 133 DEFAULT(pu->pru_sosetlabel, pru_sosetlabel_null); 134 #undef DEFAULT 135 if (pr->pr_init) 136 (*pr->pr_init)(); 137 } 138 139 /* 140 * Add a new protocol domain to the list of supported domains 141 * Note: you cant unload it again because a socket may be using it. 142 * XXX can't fail at this time. 143 */ 144 static void 145 net_init_domain(struct domain *dp) 146 { 147 struct protosw *pr; 148 149 if (dp->dom_init) 150 (*dp->dom_init)(); 151 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 152 protosw_init(pr); 153 /* 154 * update global information about maximums 155 */ 156 max_hdr = max_linkhdr + max_protohdr; 157 max_datalen = MHLEN - max_hdr; 158 if (max_datalen < 1) 159 panic("%s: max_datalen < 1", __func__); 160 } 161 162 /* 163 * Add a new protocol domain to the list of supported domains 164 * Note: you cant unload it again because a socket may be using it. 165 * XXX can't fail at this time. 166 */ 167 void 168 net_add_domain(void *data) 169 { 170 struct domain *dp; 171 172 dp = (struct domain *)data; 173 mtx_lock(&dom_mtx); 174 dp->dom_next = domains; 175 domains = dp; 176 177 KASSERT(domain_init_status >= 1, 178 ("attempt to net_add_domain(%s) before domaininit()", 179 dp->dom_name)); 180 #ifndef INVARIANTS 181 if (domain_init_status < 1) 182 printf("WARNING: attempt to net_add_domain(%s) before " 183 "domaininit()\n", dp->dom_name); 184 #endif 185 #ifdef notyet 186 KASSERT(domain_init_status < 2, 187 ("attempt to net_add_domain(%s) after domainfinalize()", 188 dp->dom_name)); 189 #else 190 #ifdef DIAGNOSTIC 191 if (domain_init_status >= 2) 192 printf("WARNING: attempt to net_add_domain(%s) after " 193 "domainfinalize()\n", dp->dom_name); 194 #endif 195 #endif 196 mtx_unlock(&dom_mtx); 197 net_init_domain(dp); 198 } 199 200 static void 201 socket_zone_change(void *tag) 202 { 203 204 uma_zone_set_max(socket_zone, maxsockets); 205 } 206 207 /* ARGSUSED*/ 208 static void 209 domaininit(void *dummy) 210 { 211 /* 212 * Before we do any setup, make sure to initialize the 213 * zone allocator we get struct sockets from. 214 */ 215 216 socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL, 217 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 218 uma_zone_set_max(socket_zone, maxsockets); 219 EVENTHANDLER_REGISTER(maxsockets_change, socket_zone_change, NULL, 220 EVENTHANDLER_PRI_FIRST); 221 222 if (max_linkhdr < 16) /* XXX */ 223 max_linkhdr = 16; 224 225 if (debug_mpsafenet) { 226 callout_init(&pffast_callout, CALLOUT_MPSAFE); 227 callout_init(&pfslow_callout, CALLOUT_MPSAFE); 228 } else { 229 callout_init(&pffast_callout, 0); 230 callout_init(&pfslow_callout, 0); 231 } 232 233 mtx_lock(&dom_mtx); 234 KASSERT(domain_init_status == 0, ("domaininit called too late!")); 235 domain_init_status = 1; 236 mtx_unlock(&dom_mtx); 237 } 238 239 /* ARGSUSED*/ 240 static void 241 domainfinalize(void *dummy) 242 { 243 mtx_lock(&dom_mtx); 244 KASSERT(domain_init_status == 1, ("domainfinalize called too late!")); 245 domain_init_status = 2; 246 mtx_unlock(&dom_mtx); 247 248 callout_reset(&pffast_callout, 1, pffasttimo, NULL); 249 callout_reset(&pfslow_callout, 1, pfslowtimo, NULL); 250 } 251 252 struct protosw * 253 pffindtype(family, type) 254 int family; 255 int type; 256 { 257 register struct domain *dp; 258 register struct protosw *pr; 259 260 for (dp = domains; dp; dp = dp->dom_next) 261 if (dp->dom_family == family) 262 goto found; 263 return (0); 264 found: 265 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 266 if (pr->pr_type && pr->pr_type == type) 267 return (pr); 268 return (0); 269 } 270 271 struct protosw * 272 pffindproto(family, protocol, type) 273 int family; 274 int protocol; 275 int type; 276 { 277 register struct domain *dp; 278 register struct protosw *pr; 279 struct protosw *maybe = 0; 280 281 if (family == 0) 282 return (0); 283 for (dp = domains; dp; dp = dp->dom_next) 284 if (dp->dom_family == family) 285 goto found; 286 return (0); 287 found: 288 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 289 if ((pr->pr_protocol == protocol) && (pr->pr_type == type)) 290 return (pr); 291 292 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW && 293 pr->pr_protocol == 0 && maybe == (struct protosw *)0) 294 maybe = pr; 295 } 296 return (maybe); 297 } 298 299 /* 300 * The caller must make sure that the new protocol is fully set up and ready to 301 * accept requests before it is registered. 302 */ 303 int 304 pf_proto_register(family, npr) 305 int family; 306 struct protosw *npr; 307 { 308 struct domain *dp; 309 struct protosw *pr, *fpr; 310 311 /* Sanity checks. */ 312 if (family == 0) 313 return (EPFNOSUPPORT); 314 if (npr->pr_type == 0) 315 return (EPROTOTYPE); 316 if (npr->pr_protocol == 0) 317 return (EPROTONOSUPPORT); 318 if (npr->pr_usrreqs == NULL) 319 return (ENXIO); 320 321 /* Try to find the specified domain based on the family. */ 322 for (dp = domains; dp; dp = dp->dom_next) 323 if (dp->dom_family == family) 324 goto found; 325 return (EPFNOSUPPORT); 326 327 found: 328 /* Initialize backpointer to struct domain. */ 329 npr->pr_domain = dp; 330 fpr = NULL; 331 332 /* 333 * Protect us against races when two protocol registrations for 334 * the same protocol happen at the same time. 335 */ 336 mtx_lock(&Giant); 337 338 /* The new protocol must not yet exist. */ 339 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 340 if ((pr->pr_type == npr->pr_type) && 341 (pr->pr_protocol == npr->pr_protocol)) { 342 mtx_unlock(&Giant); 343 return (EEXIST); /* XXX: Check only protocol? */ 344 } 345 /* While here, remember the first free spacer. */ 346 if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER)) 347 fpr = pr; 348 } 349 350 /* If no free spacer is found we can't add the new protocol. */ 351 if (fpr == NULL) { 352 mtx_unlock(&Giant); 353 return (ENOMEM); 354 } 355 356 /* Copy the new struct protosw over the spacer. */ 357 bcopy(npr, fpr, sizeof(*fpr)); 358 359 /* Job is done, no more protection required. */ 360 mtx_unlock(&Giant); 361 362 /* Initialize and activate the protocol. */ 363 protosw_init(fpr); 364 365 return (0); 366 } 367 368 /* 369 * The caller must make sure the protocol and its functions correctly shut down 370 * all sockets and release all locks and memory references. 371 */ 372 int 373 pf_proto_unregister(family, protocol, type) 374 int family; 375 int protocol; 376 int type; 377 { 378 struct domain *dp; 379 struct protosw *pr, *dpr; 380 381 /* Sanity checks. */ 382 if (family == 0) 383 return (EPFNOSUPPORT); 384 if (protocol == 0) 385 return (EPROTONOSUPPORT); 386 if (type == 0) 387 return (EPROTOTYPE); 388 389 /* Try to find the specified domain based on the family type. */ 390 for (dp = domains; dp; dp = dp->dom_next) 391 if (dp->dom_family == family) 392 goto found; 393 return (EPFNOSUPPORT); 394 395 found: 396 dpr = NULL; 397 398 /* Lock out everyone else while we are manipulating the protosw. */ 399 mtx_lock(&Giant); 400 401 /* The protocol must exist and only once. */ 402 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 403 if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) { 404 if (dpr != NULL) { 405 mtx_unlock(&Giant); 406 return (EMLINK); /* Should not happen! */ 407 } else 408 dpr = pr; 409 } 410 } 411 412 /* Protocol does not exist. */ 413 if (dpr == NULL) { 414 mtx_unlock(&Giant); 415 return (EPROTONOSUPPORT); 416 } 417 418 /* De-orbit the protocol and make the slot available again. */ 419 dpr->pr_type = 0; 420 dpr->pr_domain = dp; 421 dpr->pr_protocol = PROTO_SPACER; 422 dpr->pr_flags = 0; 423 dpr->pr_input = NULL; 424 dpr->pr_output = NULL; 425 dpr->pr_ctlinput = NULL; 426 dpr->pr_ctloutput = NULL; 427 dpr->pr_ousrreq = NULL; 428 dpr->pr_init = NULL; 429 dpr->pr_fasttimo = NULL; 430 dpr->pr_slowtimo = NULL; 431 dpr->pr_drain = NULL; 432 dpr->pr_usrreqs = &nousrreqs; 433 434 /* Job is done, not more protection required. */ 435 mtx_unlock(&Giant); 436 437 return (0); 438 } 439 440 void 441 pfctlinput(cmd, sa) 442 int cmd; 443 struct sockaddr *sa; 444 { 445 register struct domain *dp; 446 register struct protosw *pr; 447 448 for (dp = domains; dp; dp = dp->dom_next) 449 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 450 if (pr->pr_ctlinput) 451 (*pr->pr_ctlinput)(cmd, sa, (void *)0); 452 } 453 454 void 455 pfctlinput2(cmd, sa, ctlparam) 456 int cmd; 457 struct sockaddr *sa; 458 void *ctlparam; 459 { 460 struct domain *dp; 461 struct protosw *pr; 462 463 if (!sa) 464 return; 465 for (dp = domains; dp; dp = dp->dom_next) { 466 /* 467 * the check must be made by xx_ctlinput() anyways, to 468 * make sure we use data item pointed to by ctlparam in 469 * correct way. the following check is made just for safety. 470 */ 471 if (dp->dom_family != sa->sa_family) 472 continue; 473 474 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 475 if (pr->pr_ctlinput) 476 (*pr->pr_ctlinput)(cmd, sa, ctlparam); 477 } 478 } 479 480 static void 481 pfslowtimo(arg) 482 void *arg; 483 { 484 register struct domain *dp; 485 register struct protosw *pr; 486 487 NET_ASSERT_GIANT(); 488 489 for (dp = domains; dp; dp = dp->dom_next) 490 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 491 if (pr->pr_slowtimo) 492 (*pr->pr_slowtimo)(); 493 callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL); 494 } 495 496 static void 497 pffasttimo(arg) 498 void *arg; 499 { 500 register struct domain *dp; 501 register struct protosw *pr; 502 503 NET_ASSERT_GIANT(); 504 505 for (dp = domains; dp; dp = dp->dom_next) 506 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 507 if (pr->pr_fasttimo) 508 (*pr->pr_fasttimo)(); 509 callout_reset(&pffast_callout, hz/5, pffasttimo, NULL); 510 }
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