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: releng/6.2/sys/kern/uipc_domain.c 164286 2006-11-14 20:42:41Z cvs2svn $"); 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_connect, pru_connect_notsupp); 119 DEFAULT(pu->pru_connect2, pru_connect2_notsupp); 120 DEFAULT(pu->pru_control, pru_control_notsupp); 121 DEFAULT(pu->pru_listen, pru_listen_notsupp); 122 DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp); 123 DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp); 124 DEFAULT(pu->pru_sense, pru_sense_null); 125 DEFAULT(pu->pru_sosend, sosend); 126 DEFAULT(pu->pru_soreceive, soreceive); 127 DEFAULT(pu->pru_sopoll, sopoll); 128 DEFAULT(pu->pru_sosetlabel, pru_sosetlabel_null); 129 #undef DEFAULT 130 if (pr->pr_init) 131 (*pr->pr_init)(); 132 } 133 134 /* 135 * Add a new protocol domain to the list of supported domains 136 * Note: you cant unload it again because a socket may be using it. 137 * XXX can't fail at this time. 138 */ 139 static void 140 net_init_domain(struct domain *dp) 141 { 142 struct protosw *pr; 143 144 if (dp->dom_init) 145 (*dp->dom_init)(); 146 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 147 protosw_init(pr); 148 /* 149 * update global information about maximums 150 */ 151 max_hdr = max_linkhdr + max_protohdr; 152 max_datalen = MHLEN - max_hdr; 153 if (max_datalen < 1) 154 panic("%s: max_datalen < 1", __func__); 155 } 156 157 /* 158 * Add a new protocol domain to the list of supported domains 159 * Note: you cant unload it again because a socket may be using it. 160 * XXX can't fail at this time. 161 */ 162 void 163 net_add_domain(void *data) 164 { 165 struct domain *dp; 166 167 dp = (struct domain *)data; 168 mtx_lock(&dom_mtx); 169 dp->dom_next = domains; 170 domains = dp; 171 172 KASSERT(domain_init_status >= 1, 173 ("attempt to net_add_domain(%s) before domaininit()", 174 dp->dom_name)); 175 #ifndef INVARIANTS 176 if (domain_init_status < 1) 177 printf("WARNING: attempt to net_add_domain(%s) before " 178 "domaininit()\n", dp->dom_name); 179 #endif 180 #ifdef notyet 181 KASSERT(domain_init_status < 2, 182 ("attempt to net_add_domain(%s) after domainfinalize()", 183 dp->dom_name)); 184 #else 185 #ifdef DIAGNOSTIC 186 if (domain_init_status >= 2) 187 printf("WARNING: attempt to net_add_domain(%s) after " 188 "domainfinalize()\n", dp->dom_name); 189 #endif 190 #endif 191 mtx_unlock(&dom_mtx); 192 net_init_domain(dp); 193 } 194 195 static void 196 socket_zone_change(void *tag) 197 { 198 199 uma_zone_set_max(socket_zone, maxsockets); 200 } 201 202 /* ARGSUSED*/ 203 static void 204 domaininit(void *dummy) 205 { 206 /* 207 * Before we do any setup, make sure to initialize the 208 * zone allocator we get struct sockets from. 209 */ 210 211 socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL, 212 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 213 uma_zone_set_max(socket_zone, maxsockets); 214 EVENTHANDLER_REGISTER(maxsockets_change, socket_zone_change, NULL, 215 EVENTHANDLER_PRI_FIRST); 216 217 if (max_linkhdr < 16) /* XXX */ 218 max_linkhdr = 16; 219 220 if (debug_mpsafenet) { 221 callout_init(&pffast_callout, CALLOUT_MPSAFE); 222 callout_init(&pfslow_callout, CALLOUT_MPSAFE); 223 } else { 224 callout_init(&pffast_callout, 0); 225 callout_init(&pfslow_callout, 0); 226 } 227 228 mtx_lock(&dom_mtx); 229 KASSERT(domain_init_status == 0, ("domaininit called too late!")); 230 domain_init_status = 1; 231 mtx_unlock(&dom_mtx); 232 } 233 234 /* ARGSUSED*/ 235 static void 236 domainfinalize(void *dummy) 237 { 238 mtx_lock(&dom_mtx); 239 KASSERT(domain_init_status == 1, ("domainfinalize called too late!")); 240 domain_init_status = 2; 241 mtx_unlock(&dom_mtx); 242 243 callout_reset(&pffast_callout, 1, pffasttimo, NULL); 244 callout_reset(&pfslow_callout, 1, pfslowtimo, NULL); 245 } 246 247 struct protosw * 248 pffindtype(family, type) 249 int family; 250 int type; 251 { 252 register struct domain *dp; 253 register struct protosw *pr; 254 255 for (dp = domains; dp; dp = dp->dom_next) 256 if (dp->dom_family == family) 257 goto found; 258 return (0); 259 found: 260 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 261 if (pr->pr_type && pr->pr_type == type) 262 return (pr); 263 return (0); 264 } 265 266 struct protosw * 267 pffindproto(family, protocol, type) 268 int family; 269 int protocol; 270 int type; 271 { 272 register struct domain *dp; 273 register struct protosw *pr; 274 struct protosw *maybe = 0; 275 276 if (family == 0) 277 return (0); 278 for (dp = domains; dp; dp = dp->dom_next) 279 if (dp->dom_family == family) 280 goto found; 281 return (0); 282 found: 283 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 284 if ((pr->pr_protocol == protocol) && (pr->pr_type == type)) 285 return (pr); 286 287 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW && 288 pr->pr_protocol == 0 && maybe == (struct protosw *)0) 289 maybe = pr; 290 } 291 return (maybe); 292 } 293 294 /* 295 * The caller must make sure that the new protocol is fully set up and ready to 296 * accept requests before it is registered. 297 */ 298 int 299 pf_proto_register(family, npr) 300 int family; 301 struct protosw *npr; 302 { 303 struct domain *dp; 304 struct protosw *pr, *fpr; 305 306 /* Sanity checks. */ 307 if (family == 0) 308 return (EPFNOSUPPORT); 309 if (npr->pr_type == 0) 310 return (EPROTOTYPE); 311 if (npr->pr_protocol == 0) 312 return (EPROTONOSUPPORT); 313 if (npr->pr_usrreqs == NULL) 314 return (ENXIO); 315 316 /* Try to find the specified domain based on the family. */ 317 for (dp = domains; dp; dp = dp->dom_next) 318 if (dp->dom_family == family) 319 goto found; 320 return (EPFNOSUPPORT); 321 322 found: 323 /* Initialize backpointer to struct domain. */ 324 npr->pr_domain = dp; 325 fpr = NULL; 326 327 /* 328 * Protect us against races when two protocol registrations for 329 * the same protocol happen at the same time. 330 */ 331 mtx_lock(&Giant); 332 333 /* The new protocol must not yet exist. */ 334 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 335 if ((pr->pr_type == npr->pr_type) && 336 (pr->pr_protocol == npr->pr_protocol)) { 337 mtx_unlock(&Giant); 338 return (EEXIST); /* XXX: Check only protocol? */ 339 } 340 /* While here, remember the first free spacer. */ 341 if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER)) 342 fpr = pr; 343 } 344 345 /* If no free spacer is found we can't add the new protocol. */ 346 if (fpr == NULL) { 347 mtx_unlock(&Giant); 348 return (ENOMEM); 349 } 350 351 /* Copy the new struct protosw over the spacer. */ 352 bcopy(npr, fpr, sizeof(*fpr)); 353 354 /* Job is done, no more protection required. */ 355 mtx_unlock(&Giant); 356 357 /* Initialize and activate the protocol. */ 358 protosw_init(fpr); 359 360 return (0); 361 } 362 363 /* 364 * The caller must make sure the protocol and its functions correctly shut down 365 * all sockets and release all locks and memory references. 366 */ 367 int 368 pf_proto_unregister(family, protocol, type) 369 int family; 370 int protocol; 371 int type; 372 { 373 struct domain *dp; 374 struct protosw *pr, *dpr; 375 376 /* Sanity checks. */ 377 if (family == 0) 378 return (EPFNOSUPPORT); 379 if (protocol == 0) 380 return (EPROTONOSUPPORT); 381 if (type == 0) 382 return (EPROTOTYPE); 383 384 /* Try to find the specified domain based on the family type. */ 385 for (dp = domains; dp; dp = dp->dom_next) 386 if (dp->dom_family == family) 387 goto found; 388 return (EPFNOSUPPORT); 389 390 found: 391 dpr = NULL; 392 393 /* Lock out everyone else while we are manipulating the protosw. */ 394 mtx_lock(&Giant); 395 396 /* The protocol must exist and only once. */ 397 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 398 if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) { 399 if (dpr != NULL) { 400 mtx_unlock(&Giant); 401 return (EMLINK); /* Should not happen! */ 402 } else 403 dpr = pr; 404 } 405 } 406 407 /* Protocol does not exist. */ 408 if (dpr == NULL) { 409 mtx_unlock(&Giant); 410 return (EPROTONOSUPPORT); 411 } 412 413 /* De-orbit the protocol and make the slot available again. */ 414 dpr->pr_type = 0; 415 dpr->pr_domain = dp; 416 dpr->pr_protocol = PROTO_SPACER; 417 dpr->pr_flags = 0; 418 dpr->pr_input = NULL; 419 dpr->pr_output = NULL; 420 dpr->pr_ctlinput = NULL; 421 dpr->pr_ctloutput = NULL; 422 dpr->pr_ousrreq = NULL; 423 dpr->pr_init = NULL; 424 dpr->pr_fasttimo = NULL; 425 dpr->pr_slowtimo = NULL; 426 dpr->pr_drain = NULL; 427 dpr->pr_usrreqs = &nousrreqs; 428 429 /* Job is done, not more protection required. */ 430 mtx_unlock(&Giant); 431 432 return (0); 433 } 434 435 void 436 pfctlinput(cmd, sa) 437 int cmd; 438 struct sockaddr *sa; 439 { 440 register struct domain *dp; 441 register struct protosw *pr; 442 443 for (dp = domains; dp; dp = dp->dom_next) 444 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 445 if (pr->pr_ctlinput) 446 (*pr->pr_ctlinput)(cmd, sa, (void *)0); 447 } 448 449 void 450 pfctlinput2(cmd, sa, ctlparam) 451 int cmd; 452 struct sockaddr *sa; 453 void *ctlparam; 454 { 455 struct domain *dp; 456 struct protosw *pr; 457 458 if (!sa) 459 return; 460 for (dp = domains; dp; dp = dp->dom_next) { 461 /* 462 * the check must be made by xx_ctlinput() anyways, to 463 * make sure we use data item pointed to by ctlparam in 464 * correct way. the following check is made just for safety. 465 */ 466 if (dp->dom_family != sa->sa_family) 467 continue; 468 469 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 470 if (pr->pr_ctlinput) 471 (*pr->pr_ctlinput)(cmd, sa, ctlparam); 472 } 473 } 474 475 static void 476 pfslowtimo(arg) 477 void *arg; 478 { 479 register struct domain *dp; 480 register struct protosw *pr; 481 482 NET_ASSERT_GIANT(); 483 484 for (dp = domains; dp; dp = dp->dom_next) 485 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 486 if (pr->pr_slowtimo) 487 (*pr->pr_slowtimo)(); 488 callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL); 489 } 490 491 static void 492 pffasttimo(arg) 493 void *arg; 494 { 495 register struct domain *dp; 496 register struct protosw *pr; 497 498 NET_ASSERT_GIANT(); 499 500 for (dp = domains; dp; dp = dp->dom_next) 501 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 502 if (pr->pr_fasttimo) 503 (*pr->pr_fasttimo)(); 504 callout_reset(&pffast_callout, hz/5, pffasttimo, NULL); 505 }
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