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 47 #include <net/vnet.h> 48 49 /* 50 * System initialization 51 * 52 * Note: domain initialization takes place on a per domain basis 53 * as a result of traversing a SYSINIT linker set. Most likely, 54 * each domain would want to call DOMAIN_SET(9) itself, which 55 * would cause the domain to be added just after domaininit() 56 * is called during startup. 57 * 58 * See DOMAIN_SET(9) for details on its use. 59 */ 60 61 static void domaininit(void *); 62 SYSINIT(domain, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, domaininit, NULL); 63 64 static void domainfinalize(void *); 65 SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize, 66 NULL); 67 68 static struct callout pffast_callout; 69 static struct callout pfslow_callout; 70 71 static void pffasttimo(void *); 72 static void pfslowtimo(void *); 73 74 struct domain *domains; /* registered protocol domains */ 75 int domain_init_status = 0; 76 static struct mtx dom_mtx; /* domain list lock */ 77 MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF); 78 79 /* 80 * Dummy protocol specific user requests function pointer array. 81 * All functions return EOPNOTSUPP. 82 */ 83 struct pr_usrreqs nousrreqs = { 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_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 }; 103 104 static void 105 protosw_init(struct protosw *pr) 106 { 107 struct pr_usrreqs *pu; 108 109 pu = pr->pr_usrreqs; 110 KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!", 111 pr->pr_domain->dom_name, 112 (int)(pr - pr->pr_domain->dom_protosw))); 113 114 /* 115 * Protocol switch methods fall into three categories: mandatory, 116 * mandatory but protosw_init() provides a default, and optional. 117 * 118 * For true protocols (i.e., pru_attach != NULL), KASSERT truly 119 * mandatory methods with no defaults, and initialize defaults for 120 * other mandatory methods if the protocol hasn't defined an 121 * implementation (NULL function pointer). 122 */ 123 #if 0 124 if (pu->pru_attach != NULL) { 125 KASSERT(pu->pru_abort != NULL, 126 ("protosw_init: %ssw[%d] pru_abort NULL", 127 pr->pr_domain->dom_name, 128 (int)(pr - pr->pr_domain->dom_protosw))); 129 KASSERT(pu->pru_send != NULL, 130 ("protosw_init: %ssw[%d] pru_send NULL", 131 pr->pr_domain->dom_name, 132 (int)(pr - pr->pr_domain->dom_protosw))); 133 } 134 #endif 135 136 #define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar) 137 DEFAULT(pu->pru_accept, pru_accept_notsupp); 138 DEFAULT(pu->pru_aio_queue, pru_aio_queue_notsupp); 139 DEFAULT(pu->pru_bind, pru_bind_notsupp); 140 DEFAULT(pu->pru_bindat, pru_bindat_notsupp); 141 DEFAULT(pu->pru_connect, pru_connect_notsupp); 142 DEFAULT(pu->pru_connect2, pru_connect2_notsupp); 143 DEFAULT(pu->pru_connectat, pru_connectat_notsupp); 144 DEFAULT(pu->pru_control, pru_control_notsupp); 145 DEFAULT(pu->pru_disconnect, pru_disconnect_notsupp); 146 DEFAULT(pu->pru_listen, pru_listen_notsupp); 147 DEFAULT(pu->pru_peeraddr, pru_peeraddr_notsupp); 148 DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp); 149 DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp); 150 DEFAULT(pu->pru_sense, pru_sense_null); 151 DEFAULT(pu->pru_shutdown, pru_shutdown_notsupp); 152 DEFAULT(pu->pru_sockaddr, pru_sockaddr_notsupp); 153 DEFAULT(pu->pru_sosend, sosend_generic); 154 DEFAULT(pu->pru_soreceive, soreceive_generic); 155 DEFAULT(pu->pru_sopoll, sopoll_generic); 156 DEFAULT(pu->pru_ready, pru_ready_notsupp); 157 #undef DEFAULT 158 if (pr->pr_init) 159 (*pr->pr_init)(); 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 domain_init(void *arg) 169 { 170 struct domain *dp = arg; 171 struct protosw *pr; 172 173 if (dp->dom_init) 174 (*dp->dom_init)(); 175 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 176 protosw_init(pr); 177 /* 178 * update global information about maximums 179 */ 180 max_hdr = max_linkhdr + max_protohdr; 181 max_datalen = MHLEN - max_hdr; 182 if (max_datalen < 1) 183 panic("%s: max_datalen < 1", __func__); 184 } 185 186 #ifdef VIMAGE 187 void 188 vnet_domain_init(void *arg) 189 { 190 191 /* Virtualized case is no different -- call init functions. */ 192 domain_init(arg); 193 } 194 195 void 196 vnet_domain_uninit(void *arg) 197 { 198 struct domain *dp = arg; 199 200 if (dp->dom_destroy) 201 (*dp->dom_destroy)(); 202 } 203 #endif 204 205 /* 206 * Add a new protocol domain to the list of supported domains 207 * Note: you cant unload it again because a socket may be using it. 208 * XXX can't fail at this time. 209 */ 210 void 211 domain_add(void *data) 212 { 213 struct domain *dp; 214 215 dp = (struct domain *)data; 216 mtx_lock(&dom_mtx); 217 dp->dom_next = domains; 218 domains = dp; 219 220 KASSERT(domain_init_status >= 1, 221 ("attempt to domain_add(%s) before domaininit()", 222 dp->dom_name)); 223 #ifndef INVARIANTS 224 if (domain_init_status < 1) 225 printf("WARNING: attempt to domain_add(%s) before " 226 "domaininit()\n", dp->dom_name); 227 #endif 228 #ifdef notyet 229 KASSERT(domain_init_status < 2, 230 ("attempt to domain_add(%s) after domainfinalize()", 231 dp->dom_name)); 232 #else 233 if (domain_init_status >= 2) 234 printf("WARNING: attempt to domain_add(%s) after " 235 "domainfinalize()\n", dp->dom_name); 236 #endif 237 mtx_unlock(&dom_mtx); 238 } 239 240 /* ARGSUSED*/ 241 static void 242 domaininit(void *dummy) 243 { 244 245 if (max_linkhdr < 16) /* XXX */ 246 max_linkhdr = 16; 247 248 callout_init(&pffast_callout, 1); 249 callout_init(&pfslow_callout, 1); 250 251 mtx_lock(&dom_mtx); 252 KASSERT(domain_init_status == 0, ("domaininit called too late!")); 253 domain_init_status = 1; 254 mtx_unlock(&dom_mtx); 255 } 256 257 /* ARGSUSED*/ 258 static void 259 domainfinalize(void *dummy) 260 { 261 262 mtx_lock(&dom_mtx); 263 KASSERT(domain_init_status == 1, ("domainfinalize called too late!")); 264 domain_init_status = 2; 265 mtx_unlock(&dom_mtx); 266 267 callout_reset(&pffast_callout, 1, pffasttimo, NULL); 268 callout_reset(&pfslow_callout, 1, pfslowtimo, NULL); 269 } 270 271 struct domain * 272 pffinddomain(int family) 273 { 274 struct domain *dp; 275 276 for (dp = domains; dp != NULL; dp = dp->dom_next) 277 if (dp->dom_family == family) 278 return (dp); 279 return (NULL); 280 } 281 282 struct protosw * 283 pffindtype(int family, int type) 284 { 285 struct domain *dp; 286 struct protosw *pr; 287 288 dp = pffinddomain(family); 289 if (dp == NULL) 290 return (NULL); 291 292 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 293 if (pr->pr_type && pr->pr_type == type) 294 return (pr); 295 return (NULL); 296 } 297 298 struct protosw * 299 pffindproto(int family, int protocol, int type) 300 { 301 struct domain *dp; 302 struct protosw *pr; 303 struct protosw *maybe; 304 305 maybe = NULL; 306 if (family == 0) 307 return (NULL); 308 309 dp = pffinddomain(family); 310 if (dp == NULL) 311 return (NULL); 312 313 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 314 if ((pr->pr_protocol == protocol) && (pr->pr_type == type)) 315 return (pr); 316 317 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW && 318 pr->pr_protocol == 0 && maybe == NULL) 319 maybe = pr; 320 } 321 return (maybe); 322 } 323 324 /* 325 * The caller must make sure that the new protocol is fully set up and ready to 326 * accept requests before it is registered. 327 */ 328 int 329 pf_proto_register(int family, struct protosw *npr) 330 { 331 VNET_ITERATOR_DECL(vnet_iter); 332 struct domain *dp; 333 struct protosw *pr, *fpr; 334 335 /* Sanity checks. */ 336 if (family == 0) 337 return (EPFNOSUPPORT); 338 if (npr->pr_type == 0) 339 return (EPROTOTYPE); 340 if (npr->pr_protocol == 0) 341 return (EPROTONOSUPPORT); 342 if (npr->pr_usrreqs == NULL) 343 return (ENXIO); 344 345 /* Try to find the specified domain based on the family. */ 346 dp = pffinddomain(family); 347 if (dp == NULL) 348 return (EPFNOSUPPORT); 349 350 /* Initialize backpointer to struct domain. */ 351 npr->pr_domain = dp; 352 fpr = NULL; 353 354 /* 355 * Protect us against races when two protocol registrations for 356 * the same protocol happen at the same time. 357 */ 358 mtx_lock(&dom_mtx); 359 360 /* The new protocol must not yet exist. */ 361 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 362 if ((pr->pr_type == npr->pr_type) && 363 (pr->pr_protocol == npr->pr_protocol)) { 364 mtx_unlock(&dom_mtx); 365 return (EEXIST); /* XXX: Check only protocol? */ 366 } 367 /* While here, remember the first free spacer. */ 368 if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER)) 369 fpr = pr; 370 } 371 372 /* If no free spacer is found we can't add the new protocol. */ 373 if (fpr == NULL) { 374 mtx_unlock(&dom_mtx); 375 return (ENOMEM); 376 } 377 378 /* Copy the new struct protosw over the spacer. */ 379 bcopy(npr, fpr, sizeof(*fpr)); 380 381 /* Job is done, no more protection required. */ 382 mtx_unlock(&dom_mtx); 383 384 /* Initialize and activate the protocol. */ 385 VNET_LIST_RLOCK(); 386 VNET_FOREACH(vnet_iter) { 387 CURVNET_SET_QUIET(vnet_iter); 388 protosw_init(fpr); 389 CURVNET_RESTORE(); 390 } 391 VNET_LIST_RUNLOCK(); 392 393 return (0); 394 } 395 396 /* 397 * The caller must make sure the protocol and its functions correctly shut down 398 * all sockets and release all locks and memory references. 399 */ 400 int 401 pf_proto_unregister(int family, int protocol, int type) 402 { 403 struct domain *dp; 404 struct protosw *pr, *dpr; 405 406 /* Sanity checks. */ 407 if (family == 0) 408 return (EPFNOSUPPORT); 409 if (protocol == 0) 410 return (EPROTONOSUPPORT); 411 if (type == 0) 412 return (EPROTOTYPE); 413 414 /* Try to find the specified domain based on the family type. */ 415 dp = pffinddomain(family); 416 if (dp == NULL) 417 return (EPFNOSUPPORT); 418 419 dpr = NULL; 420 421 /* Lock out everyone else while we are manipulating the protosw. */ 422 mtx_lock(&dom_mtx); 423 424 /* The protocol must exist and only once. */ 425 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 426 if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) { 427 if (dpr != NULL) { 428 mtx_unlock(&dom_mtx); 429 return (EMLINK); /* Should not happen! */ 430 } else 431 dpr = pr; 432 } 433 } 434 435 /* Protocol does not exist. */ 436 if (dpr == NULL) { 437 mtx_unlock(&dom_mtx); 438 return (EPROTONOSUPPORT); 439 } 440 441 /* De-orbit the protocol and make the slot available again. */ 442 dpr->pr_type = 0; 443 dpr->pr_domain = dp; 444 dpr->pr_protocol = PROTO_SPACER; 445 dpr->pr_flags = 0; 446 dpr->pr_input = NULL; 447 dpr->pr_output = NULL; 448 dpr->pr_ctlinput = NULL; 449 dpr->pr_ctloutput = NULL; 450 dpr->pr_init = NULL; 451 dpr->pr_fasttimo = NULL; 452 dpr->pr_slowtimo = NULL; 453 dpr->pr_drain = NULL; 454 dpr->pr_usrreqs = &nousrreqs; 455 456 /* Job is done, not more protection required. */ 457 mtx_unlock(&dom_mtx); 458 459 return (0); 460 } 461 462 void 463 pfctlinput(int cmd, struct sockaddr *sa) 464 { 465 struct domain *dp; 466 struct protosw *pr; 467 468 for (dp = domains; dp; dp = dp->dom_next) 469 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 470 if (pr->pr_ctlinput) 471 (*pr->pr_ctlinput)(cmd, sa, (void *)0); 472 } 473 474 void 475 pfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam) 476 { 477 struct domain *dp; 478 struct protosw *pr; 479 480 if (!sa) 481 return; 482 for (dp = domains; dp; dp = dp->dom_next) { 483 /* 484 * the check must be made by xx_ctlinput() anyways, to 485 * make sure we use data item pointed to by ctlparam in 486 * correct way. the following check is made just for safety. 487 */ 488 if (dp->dom_family != sa->sa_family) 489 continue; 490 491 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 492 if (pr->pr_ctlinput) 493 (*pr->pr_ctlinput)(cmd, sa, ctlparam); 494 } 495 } 496 497 static void 498 pfslowtimo(void *arg) 499 { 500 struct domain *dp; 501 struct protosw *pr; 502 503 for (dp = domains; dp; dp = dp->dom_next) 504 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 505 if (pr->pr_slowtimo) 506 (*pr->pr_slowtimo)(); 507 callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL); 508 } 509 510 static void 511 pffasttimo(void *arg) 512 { 513 struct domain *dp; 514 struct protosw *pr; 515 516 for (dp = domains; dp; dp = dp->dom_next) 517 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 518 if (pr->pr_fasttimo) 519 (*pr->pr_fasttimo)(); 520 callout_reset(&pffast_callout, hz/5, pffasttimo, NULL); 521 } 522