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/6.1/sys/kern/uipc_domain.c 158179 2006-04-30 16:44:43Z 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/mbuf.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <sys/socketvar.h> 44 #include <sys/systm.h> 45 #include <vm/uma.h> 46 47 /* 48 * System initialization 49 * 50 * Note: domain initialization takes place on a per domain basis 51 * as a result of traversing a SYSINIT linker set. Most likely, 52 * each domain would want to call DOMAIN_SET(9) itself, which 53 * would cause the domain to be added just after domaininit() 54 * is called during startup. 55 * 56 * See DOMAIN_SET(9) for details on its use. 57 */ 58 59 static void domaininit(void *); 60 SYSINIT(domain, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, domaininit, NULL) 61 62 static void domainfinalize(void *); 63 SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize, 64 NULL) 65 66 static struct callout pffast_callout; 67 static struct callout pfslow_callout; 68 69 static void pffasttimo(void *); 70 static void pfslowtimo(void *); 71 72 struct domain *domains; /* registered protocol domains */ 73 int domain_init_status = 0; 74 struct mtx dom_mtx; /* domain list lock */ 75 MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF); 76 77 /* 78 * Dummy protocol specific user requests function pointer array. 79 * All functions return EOPNOTSUPP. 80 */ 81 struct pr_usrreqs nousrreqs = { 82 .pru_abort = pru_abort_notsupp, 83 .pru_accept = pru_accept_notsupp, 84 .pru_attach = pru_attach_notsupp, 85 .pru_bind = pru_bind_notsupp, 86 .pru_connect = pru_connect_notsupp, 87 .pru_connect2 = pru_connect2_notsupp, 88 .pru_control = pru_control_notsupp, 89 .pru_detach = pru_detach_notsupp, 90 .pru_disconnect = pru_disconnect_notsupp, 91 .pru_listen = pru_listen_notsupp, 92 .pru_peeraddr = pru_peeraddr_notsupp, 93 .pru_rcvd = pru_rcvd_notsupp, 94 .pru_rcvoob = pru_rcvoob_notsupp, 95 .pru_send = pru_send_notsupp, 96 .pru_sense = pru_sense_null, 97 .pru_shutdown = pru_shutdown_notsupp, 98 .pru_sockaddr = pru_sockaddr_notsupp, 99 .pru_sosend = pru_sosend_notsupp, 100 .pru_soreceive = pru_soreceive_notsupp, 101 .pru_sopoll = pru_sopoll_notsupp, 102 .pru_sosetlabel = pru_sosetlabel_null 103 }; 104 105 static void 106 protosw_init(struct protosw *pr) 107 { 108 struct pr_usrreqs *pu; 109 110 pu = pr->pr_usrreqs; 111 KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!", 112 pr->pr_domain->dom_name, 113 (int)(pr - pr->pr_domain->dom_protosw))); 114 115 #define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar) 116 DEFAULT(pu->pru_accept, pru_accept_notsupp); 117 DEFAULT(pu->pru_connect, pru_connect_notsupp); 118 DEFAULT(pu->pru_connect2, pru_connect2_notsupp); 119 DEFAULT(pu->pru_control, pru_control_notsupp); 120 DEFAULT(pu->pru_listen, pru_listen_notsupp); 121 DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp); 122 DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp); 123 DEFAULT(pu->pru_sense, pru_sense_null); 124 DEFAULT(pu->pru_sosend, sosend); 125 DEFAULT(pu->pru_soreceive, soreceive); 126 DEFAULT(pu->pru_sopoll, sopoll); 127 DEFAULT(pu->pru_sosetlabel, pru_sosetlabel_null); 128 #undef DEFAULT 129 if (pr->pr_init) 130 (*pr->pr_init)(); 131 } 132 133 /* 134 * Add a new protocol domain to the list of supported domains 135 * Note: you cant unload it again because a socket may be using it. 136 * XXX can't fail at this time. 137 */ 138 static void 139 net_init_domain(struct domain *dp) 140 { 141 struct protosw *pr; 142 143 if (dp->dom_init) 144 (*dp->dom_init)(); 145 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 146 protosw_init(pr); 147 /* 148 * update global information about maximums 149 */ 150 max_hdr = max_linkhdr + max_protohdr; 151 max_datalen = MHLEN - max_hdr; 152 if (max_datalen < 1) 153 panic("%s: max_datalen < 1", __func__); 154 } 155 156 /* 157 * Add a new protocol domain to the list of supported domains 158 * Note: you cant unload it again because a socket may be using it. 159 * XXX can't fail at this time. 160 */ 161 void 162 net_add_domain(void *data) 163 { 164 struct domain *dp; 165 166 dp = (struct domain *)data; 167 mtx_lock(&dom_mtx); 168 dp->dom_next = domains; 169 domains = dp; 170 171 KASSERT(domain_init_status >= 1, 172 ("attempt to net_add_domain(%s) before domaininit()", 173 dp->dom_name)); 174 #ifndef INVARIANTS 175 if (domain_init_status < 1) 176 printf("WARNING: attempt to net_add_domain(%s) before " 177 "domaininit()\n", dp->dom_name); 178 #endif 179 #ifdef notyet 180 KASSERT(domain_init_status < 2, 181 ("attempt to net_add_domain(%s) after domainfinalize()", 182 dp->dom_name)); 183 #else 184 #ifdef DIAGNOSTIC 185 if (domain_init_status >= 2) 186 printf("WARNING: attempt to net_add_domain(%s) after " 187 "domainfinalize()\n", dp->dom_name); 188 #endif 189 #endif 190 mtx_unlock(&dom_mtx); 191 net_init_domain(dp); 192 } 193 194 /* ARGSUSED*/ 195 static void 196 domaininit(void *dummy) 197 { 198 /* 199 * Before we do any setup, make sure to initialize the 200 * zone allocator we get struct sockets from. 201 */ 202 203 socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL, 204 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 205 uma_zone_set_max(socket_zone, maxsockets); 206 207 if (max_linkhdr < 16) /* XXX */ 208 max_linkhdr = 16; 209 210 if (debug_mpsafenet) { 211 callout_init(&pffast_callout, CALLOUT_MPSAFE); 212 callout_init(&pfslow_callout, CALLOUT_MPSAFE); 213 } else { 214 callout_init(&pffast_callout, 0); 215 callout_init(&pfslow_callout, 0); 216 } 217 218 mtx_lock(&dom_mtx); 219 KASSERT(domain_init_status == 0, ("domaininit called too late!")); 220 domain_init_status = 1; 221 mtx_unlock(&dom_mtx); 222 } 223 224 /* ARGSUSED*/ 225 static void 226 domainfinalize(void *dummy) 227 { 228 mtx_lock(&dom_mtx); 229 KASSERT(domain_init_status == 1, ("domainfinalize called too late!")); 230 domain_init_status = 2; 231 mtx_unlock(&dom_mtx); 232 233 callout_reset(&pffast_callout, 1, pffasttimo, NULL); 234 callout_reset(&pfslow_callout, 1, pfslowtimo, NULL); 235 } 236 237 struct protosw * 238 pffindtype(family, type) 239 int family; 240 int type; 241 { 242 register struct domain *dp; 243 register struct protosw *pr; 244 245 for (dp = domains; dp; dp = dp->dom_next) 246 if (dp->dom_family == family) 247 goto found; 248 return (0); 249 found: 250 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 251 if (pr->pr_type && pr->pr_type == type) 252 return (pr); 253 return (0); 254 } 255 256 struct protosw * 257 pffindproto(family, protocol, type) 258 int family; 259 int protocol; 260 int type; 261 { 262 register struct domain *dp; 263 register struct protosw *pr; 264 struct protosw *maybe = 0; 265 266 if (family == 0) 267 return (0); 268 for (dp = domains; dp; dp = dp->dom_next) 269 if (dp->dom_family == family) 270 goto found; 271 return (0); 272 found: 273 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 274 if ((pr->pr_protocol == protocol) && (pr->pr_type == type)) 275 return (pr); 276 277 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW && 278 pr->pr_protocol == 0 && maybe == (struct protosw *)0) 279 maybe = pr; 280 } 281 return (maybe); 282 } 283 284 /* 285 * The caller must make sure that the new protocol is fully set up and ready to 286 * accept requests before it is registered. 287 */ 288 int 289 pf_proto_register(family, npr) 290 int family; 291 struct protosw *npr; 292 { 293 struct domain *dp; 294 struct protosw *pr, *fpr; 295 296 /* Sanity checks. */ 297 if (family == 0) 298 return (EPFNOSUPPORT); 299 if (npr->pr_type == 0) 300 return (EPROTOTYPE); 301 if (npr->pr_protocol == 0) 302 return (EPROTONOSUPPORT); 303 if (npr->pr_usrreqs == NULL) 304 return (ENXIO); 305 306 /* Try to find the specified domain based on the family. */ 307 for (dp = domains; dp; dp = dp->dom_next) 308 if (dp->dom_family == family) 309 goto found; 310 return (EPFNOSUPPORT); 311 312 found: 313 /* Initialize backpointer to struct domain. */ 314 npr->pr_domain = dp; 315 fpr = NULL; 316 317 /* 318 * Protect us against races when two protocol registrations for 319 * the same protocol happen at the same time. 320 */ 321 mtx_lock(&Giant); 322 323 /* The new protocol must not yet exist. */ 324 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 325 if ((pr->pr_type == npr->pr_type) && 326 (pr->pr_protocol == npr->pr_protocol)) { 327 mtx_unlock(&Giant); 328 return (EEXIST); /* XXX: Check only protocol? */ 329 } 330 /* While here, remember the first free spacer. */ 331 if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER)) 332 fpr = pr; 333 } 334 335 /* If no free spacer is found we can't add the new protocol. */ 336 if (fpr == NULL) { 337 mtx_unlock(&Giant); 338 return (ENOMEM); 339 } 340 341 /* Copy the new struct protosw over the spacer. */ 342 bcopy(npr, fpr, sizeof(*fpr)); 343 344 /* Job is done, no more protection required. */ 345 mtx_unlock(&Giant); 346 347 /* Initialize and activate the protocol. */ 348 protosw_init(fpr); 349 350 return (0); 351 } 352 353 /* 354 * The caller must make sure the protocol and its functions correctly shut down 355 * all sockets and release all locks and memory references. 356 */ 357 int 358 pf_proto_unregister(family, protocol, type) 359 int family; 360 int protocol; 361 int type; 362 { 363 struct domain *dp; 364 struct protosw *pr, *dpr; 365 366 /* Sanity checks. */ 367 if (family == 0) 368 return (EPFNOSUPPORT); 369 if (protocol == 0) 370 return (EPROTONOSUPPORT); 371 if (type == 0) 372 return (EPROTOTYPE); 373 374 /* Try to find the specified domain based on the family type. */ 375 for (dp = domains; dp; dp = dp->dom_next) 376 if (dp->dom_family == family) 377 goto found; 378 return (EPFNOSUPPORT); 379 380 found: 381 dpr = NULL; 382 383 /* Lock out everyone else while we are manipulating the protosw. */ 384 mtx_lock(&Giant); 385 386 /* The protocol must exist and only once. */ 387 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 388 if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) { 389 if (dpr != NULL) { 390 mtx_unlock(&Giant); 391 return (EMLINK); /* Should not happen! */ 392 } else 393 dpr = pr; 394 } 395 } 396 397 /* Protocol does not exist. */ 398 if (dpr == NULL) { 399 mtx_unlock(&Giant); 400 return (EPROTONOSUPPORT); 401 } 402 403 /* De-orbit the protocol and make the slot available again. */ 404 dpr->pr_type = 0; 405 dpr->pr_domain = dp; 406 dpr->pr_protocol = PROTO_SPACER; 407 dpr->pr_flags = 0; 408 dpr->pr_input = NULL; 409 dpr->pr_output = NULL; 410 dpr->pr_ctlinput = NULL; 411 dpr->pr_ctloutput = NULL; 412 dpr->pr_ousrreq = NULL; 413 dpr->pr_init = NULL; 414 dpr->pr_fasttimo = NULL; 415 dpr->pr_slowtimo = NULL; 416 dpr->pr_drain = NULL; 417 dpr->pr_usrreqs = &nousrreqs; 418 419 /* Job is done, not more protection required. */ 420 mtx_unlock(&Giant); 421 422 return (0); 423 } 424 425 void 426 pfctlinput(cmd, sa) 427 int cmd; 428 struct sockaddr *sa; 429 { 430 register struct domain *dp; 431 register struct protosw *pr; 432 433 for (dp = domains; dp; dp = dp->dom_next) 434 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 435 if (pr->pr_ctlinput) 436 (*pr->pr_ctlinput)(cmd, sa, (void *)0); 437 } 438 439 void 440 pfctlinput2(cmd, sa, ctlparam) 441 int cmd; 442 struct sockaddr *sa; 443 void *ctlparam; 444 { 445 struct domain *dp; 446 struct protosw *pr; 447 448 if (!sa) 449 return; 450 for (dp = domains; dp; dp = dp->dom_next) { 451 /* 452 * the check must be made by xx_ctlinput() anyways, to 453 * make sure we use data item pointed to by ctlparam in 454 * correct way. the following check is made just for safety. 455 */ 456 if (dp->dom_family != sa->sa_family) 457 continue; 458 459 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 460 if (pr->pr_ctlinput) 461 (*pr->pr_ctlinput)(cmd, sa, ctlparam); 462 } 463 } 464 465 static void 466 pfslowtimo(arg) 467 void *arg; 468 { 469 register struct domain *dp; 470 register struct protosw *pr; 471 472 NET_ASSERT_GIANT(); 473 474 for (dp = domains; dp; dp = dp->dom_next) 475 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 476 if (pr->pr_slowtimo) 477 (*pr->pr_slowtimo)(); 478 callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL); 479 } 480 481 static void 482 pffasttimo(arg) 483 void *arg; 484 { 485 register struct domain *dp; 486 register struct protosw *pr; 487 488 NET_ASSERT_GIANT(); 489 490 for (dp = domains; dp; dp = dp->dom_next) 491 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 492 if (pr->pr_fasttimo) 493 (*pr->pr_fasttimo)(); 494 callout_reset(&pffast_callout, hz/5, pffasttimo, NULL); 495 }
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