1 /*- 2 * Copyright (c) 1996-1999 Whistle Communications, Inc. 3 * All rights reserved. 4 * 5 * Subject to the following obligations and disclaimer of warranty, use and 6 * redistribution of this software, in source or object code forms, with or 7 * without modifications are expressly permitted by Whistle Communications; 8 * provided, however, that: 9 * 1. Any and all reproductions of the source or object code must include the 10 * copyright notice above and the following disclaimer of warranties; and 11 * 2. No rights are granted, in any manner or form, to use Whistle 12 * Communications, Inc. trademarks, including the mark "WHISTLE 13 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 14 * such appears in the above copyright notice or in the software. 15 * 16 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 17 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 18 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 19 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 21 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 22 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 23 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 24 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 25 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 26 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 27 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 28 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 32 * OF SUCH DAMAGE. 33 * 34 * Authors: Julian Elischer <julian@freebsd.org> 35 * Archie Cobbs <archie@freebsd.org> 36 * 37 * $FreeBSD$ 38 * $Whistle: ng_base.c,v 1.39 1999/01/28 23:54:53 julian Exp $ 39 */ 40 41 /* 42 * This file implements the base netgraph code. 43 */ 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/ctype.h> 48 #include <sys/hash.h> 49 #include <sys/kdb.h> 50 #include <sys/kernel.h> 51 #include <sys/kthread.h> 52 #include <sys/ktr.h> 53 #include <sys/limits.h> 54 #include <sys/lock.h> 55 #include <sys/malloc.h> 56 #include <sys/mbuf.h> 57 #include <sys/proc.h> 58 #include <sys/epoch.h> 59 #include <sys/queue.h> 60 #include <sys/refcount.h> 61 #include <sys/rwlock.h> 62 #include <sys/smp.h> 63 #include <sys/sysctl.h> 64 #include <sys/syslog.h> 65 #include <sys/unistd.h> 66 #include <machine/cpu.h> 67 #include <vm/uma.h> 68 69 #include <net/netisr.h> 70 #include <net/vnet.h> 71 72 #include <netgraph/ng_message.h> 73 #include <netgraph/netgraph.h> 74 #include <netgraph/ng_parse.h> 75 76 MODULE_VERSION(netgraph, NG_ABI_VERSION); 77 78 /* Mutex to protect topology events. */ 79 static struct rwlock ng_topo_lock; 80 #define TOPOLOGY_RLOCK() rw_rlock(&ng_topo_lock) 81 #define TOPOLOGY_RUNLOCK() rw_runlock(&ng_topo_lock) 82 #define TOPOLOGY_WLOCK() rw_wlock(&ng_topo_lock) 83 #define TOPOLOGY_WUNLOCK() rw_wunlock(&ng_topo_lock) 84 #define TOPOLOGY_NOTOWNED() rw_assert(&ng_topo_lock, RA_UNLOCKED) 85 86 #ifdef NETGRAPH_DEBUG 87 static struct mtx ng_nodelist_mtx; /* protects global node/hook lists */ 88 static struct mtx ngq_mtx; /* protects the queue item list */ 89 90 static SLIST_HEAD(, ng_node) ng_allnodes; 91 static LIST_HEAD(, ng_node) ng_freenodes; /* in debug, we never free() them */ 92 static SLIST_HEAD(, ng_hook) ng_allhooks; 93 static LIST_HEAD(, ng_hook) ng_freehooks; /* in debug, we never free() them */ 94 95 static void ng_dumpitems(void); 96 static void ng_dumpnodes(void); 97 static void ng_dumphooks(void); 98 99 #endif /* NETGRAPH_DEBUG */ 100 /* 101 * DEAD versions of the structures. 102 * In order to avoid races, it is sometimes necessary to point 103 * at SOMETHING even though theoretically, the current entity is 104 * INVALID. Use these to avoid these races. 105 */ 106 struct ng_type ng_deadtype = { 107 NG_ABI_VERSION, 108 "dead", 109 NULL, /* modevent */ 110 NULL, /* constructor */ 111 NULL, /* rcvmsg */ 112 NULL, /* shutdown */ 113 NULL, /* newhook */ 114 NULL, /* findhook */ 115 NULL, /* connect */ 116 NULL, /* rcvdata */ 117 NULL, /* disconnect */ 118 NULL, /* cmdlist */ 119 }; 120 121 struct ng_node ng_deadnode = { 122 "dead", 123 &ng_deadtype, 124 NGF_INVALID, 125 0, /* numhooks */ 126 NULL, /* private */ 127 0, /* ID */ 128 LIST_HEAD_INITIALIZER(ng_deadnode.nd_hooks), 129 {}, /* all_nodes list entry */ 130 {}, /* id hashtable list entry */ 131 { 0, 132 0, 133 {}, /* should never use! (should hang) */ 134 {}, /* workqueue entry */ 135 STAILQ_HEAD_INITIALIZER(ng_deadnode.nd_input_queue.queue), 136 }, 137 1, /* refs */ 138 NULL, /* vnet */ 139 #ifdef NETGRAPH_DEBUG 140 ND_MAGIC, 141 __FILE__, 142 __LINE__, 143 {NULL} 144 #endif /* NETGRAPH_DEBUG */ 145 }; 146 147 struct ng_hook ng_deadhook = { 148 "dead", 149 NULL, /* private */ 150 HK_INVALID | HK_DEAD, 151 0, /* undefined data link type */ 152 &ng_deadhook, /* Peer is self */ 153 &ng_deadnode, /* attached to deadnode */ 154 {}, /* hooks list */ 155 NULL, /* override rcvmsg() */ 156 NULL, /* override rcvdata() */ 157 1, /* refs always >= 1 */ 158 #ifdef NETGRAPH_DEBUG 159 HK_MAGIC, 160 __FILE__, 161 __LINE__, 162 {NULL} 163 #endif /* NETGRAPH_DEBUG */ 164 }; 165 166 /* 167 * END DEAD STRUCTURES 168 */ 169 /* List nodes with unallocated work */ 170 static STAILQ_HEAD(, ng_node) ng_worklist = STAILQ_HEAD_INITIALIZER(ng_worklist); 171 static struct mtx ng_worklist_mtx; /* MUST LOCK NODE FIRST */ 172 173 /* List of installed types */ 174 static LIST_HEAD(, ng_type) ng_typelist; 175 static struct rwlock ng_typelist_lock; 176 #define TYPELIST_RLOCK() rw_rlock(&ng_typelist_lock) 177 #define TYPELIST_RUNLOCK() rw_runlock(&ng_typelist_lock) 178 #define TYPELIST_WLOCK() rw_wlock(&ng_typelist_lock) 179 #define TYPELIST_WUNLOCK() rw_wunlock(&ng_typelist_lock) 180 181 /* Hash related definitions. */ 182 LIST_HEAD(nodehash, ng_node); 183 VNET_DEFINE_STATIC(struct nodehash *, ng_ID_hash); 184 VNET_DEFINE_STATIC(u_long, ng_ID_hmask); 185 VNET_DEFINE_STATIC(u_long, ng_nodes); 186 VNET_DEFINE_STATIC(struct nodehash *, ng_name_hash); 187 VNET_DEFINE_STATIC(u_long, ng_name_hmask); 188 VNET_DEFINE_STATIC(u_long, ng_named_nodes); 189 #define V_ng_ID_hash VNET(ng_ID_hash) 190 #define V_ng_ID_hmask VNET(ng_ID_hmask) 191 #define V_ng_nodes VNET(ng_nodes) 192 #define V_ng_name_hash VNET(ng_name_hash) 193 #define V_ng_name_hmask VNET(ng_name_hmask) 194 #define V_ng_named_nodes VNET(ng_named_nodes) 195 196 static struct rwlock ng_idhash_lock; 197 #define IDHASH_RLOCK() rw_rlock(&ng_idhash_lock) 198 #define IDHASH_RUNLOCK() rw_runlock(&ng_idhash_lock) 199 #define IDHASH_WLOCK() rw_wlock(&ng_idhash_lock) 200 #define IDHASH_WUNLOCK() rw_wunlock(&ng_idhash_lock) 201 202 /* Method to find a node.. used twice so do it here */ 203 #define NG_IDHASH_FN(ID) ((ID) % (V_ng_ID_hmask + 1)) 204 #define NG_IDHASH_FIND(ID, node) \ 205 do { \ 206 rw_assert(&ng_idhash_lock, RA_LOCKED); \ 207 LIST_FOREACH(node, &V_ng_ID_hash[NG_IDHASH_FN(ID)], \ 208 nd_idnodes) { \ 209 if (NG_NODE_IS_VALID(node) \ 210 && (NG_NODE_ID(node) == ID)) { \ 211 break; \ 212 } \ 213 } \ 214 } while (0) 215 216 static struct rwlock ng_namehash_lock; 217 #define NAMEHASH_RLOCK() rw_rlock(&ng_namehash_lock) 218 #define NAMEHASH_RUNLOCK() rw_runlock(&ng_namehash_lock) 219 #define NAMEHASH_WLOCK() rw_wlock(&ng_namehash_lock) 220 #define NAMEHASH_WUNLOCK() rw_wunlock(&ng_namehash_lock) 221 222 /* Internal functions */ 223 static int ng_add_hook(node_p node, const char *name, hook_p * hookp); 224 static int ng_generic_msg(node_p here, item_p item, hook_p lasthook); 225 static ng_ID_t ng_decodeidname(const char *name); 226 static int ngb_mod_event(module_t mod, int event, void *data); 227 static void ng_worklist_add(node_p node); 228 static void ngthread(void *); 229 static int ng_apply_item(node_p node, item_p item, int rw); 230 static void ng_flush_input_queue(node_p node); 231 static node_p ng_ID2noderef(ng_ID_t ID); 232 static int ng_con_nodes(item_p item, node_p node, const char *name, 233 node_p node2, const char *name2); 234 static int ng_con_part2(node_p node, item_p item, hook_p hook); 235 static int ng_con_part3(node_p node, item_p item, hook_p hook); 236 static int ng_mkpeer(node_p node, const char *name, const char *name2, 237 char *type); 238 static void ng_name_rehash(void); 239 static void ng_ID_rehash(void); 240 241 /* Imported, these used to be externally visible, some may go back. */ 242 void ng_destroy_hook(hook_p hook); 243 int ng_path2noderef(node_p here, const char *path, 244 node_p *dest, hook_p *lasthook); 245 int ng_make_node(const char *type, node_p *nodepp); 246 int ng_path_parse(char *addr, char **node, char **path, char **hook); 247 void ng_rmnode(node_p node, hook_p dummy1, void *dummy2, int dummy3); 248 void ng_unname(node_p node); 249 250 /* Our own netgraph malloc type */ 251 MALLOC_DEFINE(M_NETGRAPH, "netgraph", "netgraph structures and ctrl messages"); 252 MALLOC_DEFINE(M_NETGRAPH_MSG, "netgraph_msg", "netgraph name storage"); 253 static MALLOC_DEFINE(M_NETGRAPH_HOOK, "netgraph_hook", 254 "netgraph hook structures"); 255 static MALLOC_DEFINE(M_NETGRAPH_NODE, "netgraph_node", 256 "netgraph node structures"); 257 static MALLOC_DEFINE(M_NETGRAPH_ITEM, "netgraph_item", 258 "netgraph item structures"); 259 260 /* Should not be visible outside this file */ 261 262 #define _NG_ALLOC_HOOK(hook) \ 263 hook = malloc(sizeof(*hook), M_NETGRAPH_HOOK, M_NOWAIT | M_ZERO) 264 #define _NG_ALLOC_NODE(node) \ 265 node = malloc(sizeof(*node), M_NETGRAPH_NODE, M_NOWAIT | M_ZERO) 266 267 #define NG_QUEUE_LOCK_INIT(n) \ 268 mtx_init(&(n)->q_mtx, "ng_node", NULL, MTX_DEF) 269 #define NG_QUEUE_LOCK(n) \ 270 mtx_lock(&(n)->q_mtx) 271 #define NG_QUEUE_UNLOCK(n) \ 272 mtx_unlock(&(n)->q_mtx) 273 #define NG_WORKLIST_LOCK_INIT() \ 274 mtx_init(&ng_worklist_mtx, "ng_worklist", NULL, MTX_DEF) 275 #define NG_WORKLIST_LOCK() \ 276 mtx_lock(&ng_worklist_mtx) 277 #define NG_WORKLIST_UNLOCK() \ 278 mtx_unlock(&ng_worklist_mtx) 279 #define NG_WORKLIST_SLEEP() \ 280 mtx_sleep(&ng_worklist, &ng_worklist_mtx, PI_NET, "sleep", 0) 281 #define NG_WORKLIST_WAKEUP() \ 282 wakeup_one(&ng_worklist) 283 284 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 285 /* 286 * In debug mode: 287 * In an attempt to help track reference count screwups 288 * we do not free objects back to the malloc system, but keep them 289 * in a local cache where we can examine them and keep information safely 290 * after they have been freed. 291 * We use this scheme for nodes and hooks, and to some extent for items. 292 */ 293 static __inline hook_p 294 ng_alloc_hook(void) 295 { 296 hook_p hook; 297 SLIST_ENTRY(ng_hook) temp; 298 mtx_lock(&ng_nodelist_mtx); 299 hook = LIST_FIRST(&ng_freehooks); 300 if (hook) { 301 LIST_REMOVE(hook, hk_hooks); 302 bcopy(&hook->hk_all, &temp, sizeof(temp)); 303 bzero(hook, sizeof(struct ng_hook)); 304 bcopy(&temp, &hook->hk_all, sizeof(temp)); 305 mtx_unlock(&ng_nodelist_mtx); 306 hook->hk_magic = HK_MAGIC; 307 } else { 308 mtx_unlock(&ng_nodelist_mtx); 309 _NG_ALLOC_HOOK(hook); 310 if (hook) { 311 hook->hk_magic = HK_MAGIC; 312 mtx_lock(&ng_nodelist_mtx); 313 SLIST_INSERT_HEAD(&ng_allhooks, hook, hk_all); 314 mtx_unlock(&ng_nodelist_mtx); 315 } 316 } 317 return (hook); 318 } 319 320 static __inline node_p 321 ng_alloc_node(void) 322 { 323 node_p node; 324 SLIST_ENTRY(ng_node) temp; 325 mtx_lock(&ng_nodelist_mtx); 326 node = LIST_FIRST(&ng_freenodes); 327 if (node) { 328 LIST_REMOVE(node, nd_nodes); 329 bcopy(&node->nd_all, &temp, sizeof(temp)); 330 bzero(node, sizeof(struct ng_node)); 331 bcopy(&temp, &node->nd_all, sizeof(temp)); 332 mtx_unlock(&ng_nodelist_mtx); 333 node->nd_magic = ND_MAGIC; 334 } else { 335 mtx_unlock(&ng_nodelist_mtx); 336 _NG_ALLOC_NODE(node); 337 if (node) { 338 node->nd_magic = ND_MAGIC; 339 mtx_lock(&ng_nodelist_mtx); 340 SLIST_INSERT_HEAD(&ng_allnodes, node, nd_all); 341 mtx_unlock(&ng_nodelist_mtx); 342 } 343 } 344 return (node); 345 } 346 347 #define NG_ALLOC_HOOK(hook) do { (hook) = ng_alloc_hook(); } while (0) 348 #define NG_ALLOC_NODE(node) do { (node) = ng_alloc_node(); } while (0) 349 350 #define NG_FREE_HOOK(hook) \ 351 do { \ 352 mtx_lock(&ng_nodelist_mtx); \ 353 LIST_INSERT_HEAD(&ng_freehooks, hook, hk_hooks); \ 354 hook->hk_magic = 0; \ 355 mtx_unlock(&ng_nodelist_mtx); \ 356 } while (0) 357 358 #define NG_FREE_NODE(node) \ 359 do { \ 360 mtx_lock(&ng_nodelist_mtx); \ 361 LIST_INSERT_HEAD(&ng_freenodes, node, nd_nodes); \ 362 node->nd_magic = 0; \ 363 mtx_unlock(&ng_nodelist_mtx); \ 364 } while (0) 365 366 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 367 368 #define NG_ALLOC_HOOK(hook) _NG_ALLOC_HOOK(hook) 369 #define NG_ALLOC_NODE(node) _NG_ALLOC_NODE(node) 370 371 #define NG_FREE_HOOK(hook) do { free((hook), M_NETGRAPH_HOOK); } while (0) 372 #define NG_FREE_NODE(node) do { free((node), M_NETGRAPH_NODE); } while (0) 373 374 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 375 376 /* Set this to kdb_enter("X") to catch all errors as they occur */ 377 #ifndef TRAP_ERROR 378 #define TRAP_ERROR() 379 #endif 380 381 VNET_DEFINE_STATIC(ng_ID_t, nextID) = 1; 382 #define V_nextID VNET(nextID) 383 384 #ifdef INVARIANTS 385 #define CHECK_DATA_MBUF(m) do { \ 386 struct mbuf *n; \ 387 int total; \ 388 \ 389 M_ASSERTPKTHDR(m); \ 390 for (total = 0, n = (m); n != NULL; n = n->m_next) { \ 391 total += n->m_len; \ 392 if (n->m_nextpkt != NULL) \ 393 panic("%s: m_nextpkt", __func__); \ 394 } \ 395 \ 396 if ((m)->m_pkthdr.len != total) { \ 397 panic("%s: %d != %d", \ 398 __func__, (m)->m_pkthdr.len, total); \ 399 } \ 400 } while (0) 401 #else 402 #define CHECK_DATA_MBUF(m) 403 #endif 404 405 #define ERROUT(x) do { error = (x); goto done; } while (0) 406 407 /************************************************************************ 408 Parse type definitions for generic messages 409 ************************************************************************/ 410 411 /* Handy structure parse type defining macro */ 412 #define DEFINE_PARSE_STRUCT_TYPE(lo, up, args) \ 413 static const struct ng_parse_struct_field \ 414 ng_ ## lo ## _type_fields[] = NG_GENERIC_ ## up ## _INFO args; \ 415 static const struct ng_parse_type ng_generic_ ## lo ## _type = { \ 416 &ng_parse_struct_type, \ 417 &ng_ ## lo ## _type_fields \ 418 } 419 420 DEFINE_PARSE_STRUCT_TYPE(mkpeer, MKPEER, ()); 421 DEFINE_PARSE_STRUCT_TYPE(connect, CONNECT, ()); 422 DEFINE_PARSE_STRUCT_TYPE(name, NAME, ()); 423 DEFINE_PARSE_STRUCT_TYPE(rmhook, RMHOOK, ()); 424 DEFINE_PARSE_STRUCT_TYPE(nodeinfo, NODEINFO, ()); 425 DEFINE_PARSE_STRUCT_TYPE(typeinfo, TYPEINFO, ()); 426 DEFINE_PARSE_STRUCT_TYPE(linkinfo, LINKINFO, (&ng_generic_nodeinfo_type)); 427 428 /* Get length of an array when the length is stored as a 32 bit 429 value immediately preceding the array -- as with struct namelist 430 and struct typelist. */ 431 static int 432 ng_generic_list_getLength(const struct ng_parse_type *type, 433 const u_char *start, const u_char *buf) 434 { 435 return *((const u_int32_t *)(buf - 4)); 436 } 437 438 /* Get length of the array of struct linkinfo inside a struct hooklist */ 439 static int 440 ng_generic_linkinfo_getLength(const struct ng_parse_type *type, 441 const u_char *start, const u_char *buf) 442 { 443 const struct hooklist *hl = (const struct hooklist *)start; 444 445 return hl->nodeinfo.hooks; 446 } 447 448 /* Array type for a variable length array of struct namelist */ 449 static const struct ng_parse_array_info ng_nodeinfoarray_type_info = { 450 &ng_generic_nodeinfo_type, 451 &ng_generic_list_getLength 452 }; 453 static const struct ng_parse_type ng_generic_nodeinfoarray_type = { 454 &ng_parse_array_type, 455 &ng_nodeinfoarray_type_info 456 }; 457 458 /* Array type for a variable length array of struct typelist */ 459 static const struct ng_parse_array_info ng_typeinfoarray_type_info = { 460 &ng_generic_typeinfo_type, 461 &ng_generic_list_getLength 462 }; 463 static const struct ng_parse_type ng_generic_typeinfoarray_type = { 464 &ng_parse_array_type, 465 &ng_typeinfoarray_type_info 466 }; 467 468 /* Array type for array of struct linkinfo in struct hooklist */ 469 static const struct ng_parse_array_info ng_generic_linkinfo_array_type_info = { 470 &ng_generic_linkinfo_type, 471 &ng_generic_linkinfo_getLength 472 }; 473 static const struct ng_parse_type ng_generic_linkinfo_array_type = { 474 &ng_parse_array_type, 475 &ng_generic_linkinfo_array_type_info 476 }; 477 478 DEFINE_PARSE_STRUCT_TYPE(typelist, TYPELIST, (&ng_generic_typeinfoarray_type)); 479 DEFINE_PARSE_STRUCT_TYPE(hooklist, HOOKLIST, 480 (&ng_generic_nodeinfo_type, &ng_generic_linkinfo_array_type)); 481 DEFINE_PARSE_STRUCT_TYPE(listnodes, LISTNODES, 482 (&ng_generic_nodeinfoarray_type)); 483 484 /* List of commands and how to convert arguments to/from ASCII */ 485 static const struct ng_cmdlist ng_generic_cmds[] = { 486 { 487 NGM_GENERIC_COOKIE, 488 NGM_SHUTDOWN, 489 "shutdown", 490 NULL, 491 NULL 492 }, 493 { 494 NGM_GENERIC_COOKIE, 495 NGM_MKPEER, 496 "mkpeer", 497 &ng_generic_mkpeer_type, 498 NULL 499 }, 500 { 501 NGM_GENERIC_COOKIE, 502 NGM_CONNECT, 503 "connect", 504 &ng_generic_connect_type, 505 NULL 506 }, 507 { 508 NGM_GENERIC_COOKIE, 509 NGM_NAME, 510 "name", 511 &ng_generic_name_type, 512 NULL 513 }, 514 { 515 NGM_GENERIC_COOKIE, 516 NGM_RMHOOK, 517 "rmhook", 518 &ng_generic_rmhook_type, 519 NULL 520 }, 521 { 522 NGM_GENERIC_COOKIE, 523 NGM_NODEINFO, 524 "nodeinfo", 525 NULL, 526 &ng_generic_nodeinfo_type 527 }, 528 { 529 NGM_GENERIC_COOKIE, 530 NGM_LISTHOOKS, 531 "listhooks", 532 NULL, 533 &ng_generic_hooklist_type 534 }, 535 { 536 NGM_GENERIC_COOKIE, 537 NGM_LISTNAMES, 538 "listnames", 539 NULL, 540 &ng_generic_listnodes_type /* same as NGM_LISTNODES */ 541 }, 542 { 543 NGM_GENERIC_COOKIE, 544 NGM_LISTNODES, 545 "listnodes", 546 NULL, 547 &ng_generic_listnodes_type 548 }, 549 { 550 NGM_GENERIC_COOKIE, 551 NGM_LISTTYPES, 552 "listtypes", 553 NULL, 554 &ng_generic_typelist_type 555 }, 556 { 557 NGM_GENERIC_COOKIE, 558 NGM_TEXT_CONFIG, 559 "textconfig", 560 NULL, 561 &ng_parse_string_type 562 }, 563 { 564 NGM_GENERIC_COOKIE, 565 NGM_TEXT_STATUS, 566 "textstatus", 567 NULL, 568 &ng_parse_string_type 569 }, 570 { 571 NGM_GENERIC_COOKIE, 572 NGM_ASCII2BINARY, 573 "ascii2binary", 574 &ng_parse_ng_mesg_type, 575 &ng_parse_ng_mesg_type 576 }, 577 { 578 NGM_GENERIC_COOKIE, 579 NGM_BINARY2ASCII, 580 "binary2ascii", 581 &ng_parse_ng_mesg_type, 582 &ng_parse_ng_mesg_type 583 }, 584 { 0 } 585 }; 586 587 /************************************************************************ 588 Node routines 589 ************************************************************************/ 590 591 /* 592 * Instantiate a node of the requested type 593 */ 594 int 595 ng_make_node(const char *typename, node_p *nodepp) 596 { 597 struct ng_type *type; 598 int error; 599 600 /* Check that the type makes sense */ 601 if (typename == NULL) { 602 TRAP_ERROR(); 603 return (EINVAL); 604 } 605 606 /* Locate the node type. If we fail we return. Do not try to load 607 * module. 608 */ 609 if ((type = ng_findtype(typename)) == NULL) 610 return (ENXIO); 611 612 /* 613 * If we have a constructor, then make the node and 614 * call the constructor to do type specific initialisation. 615 */ 616 if (type->constructor != NULL) { 617 if ((error = ng_make_node_common(type, nodepp)) == 0) { 618 if ((error = ((*type->constructor)(*nodepp))) != 0) { 619 NG_NODE_UNREF(*nodepp); 620 } 621 } 622 } else { 623 /* 624 * Node has no constructor. We cannot ask for one 625 * to be made. It must be brought into existence by 626 * some external agency. The external agency should 627 * call ng_make_node_common() directly to get the 628 * netgraph part initialised. 629 */ 630 TRAP_ERROR(); 631 error = EINVAL; 632 } 633 return (error); 634 } 635 636 /* 637 * Generic node creation. Called by node initialisation for externally 638 * instantiated nodes (e.g. hardware, sockets, etc ). 639 * The returned node has a reference count of 1. 640 */ 641 int 642 ng_make_node_common(struct ng_type *type, node_p *nodepp) 643 { 644 node_p node; 645 646 /* Require the node type to have been already installed */ 647 if (ng_findtype(type->name) == NULL) { 648 TRAP_ERROR(); 649 return (EINVAL); 650 } 651 652 /* Make a node and try attach it to the type */ 653 NG_ALLOC_NODE(node); 654 if (node == NULL) { 655 TRAP_ERROR(); 656 return (ENOMEM); 657 } 658 node->nd_type = type; 659 #ifdef VIMAGE 660 node->nd_vnet = curvnet; 661 #endif 662 NG_NODE_REF(node); /* note reference */ 663 type->refs++; 664 665 NG_QUEUE_LOCK_INIT(&node->nd_input_queue); 666 STAILQ_INIT(&node->nd_input_queue.queue); 667 node->nd_input_queue.q_flags = 0; 668 669 /* Initialize hook list for new node */ 670 LIST_INIT(&node->nd_hooks); 671 672 /* Get an ID and put us in the hash chain. */ 673 IDHASH_WLOCK(); 674 for (;;) { /* wrap protection, even if silly */ 675 node_p node2 = NULL; 676 node->nd_ID = V_nextID++; /* 137/sec for 1 year before wrap */ 677 678 /* Is there a problem with the new number? */ 679 NG_IDHASH_FIND(node->nd_ID, node2); /* already taken? */ 680 if ((node->nd_ID != 0) && (node2 == NULL)) { 681 break; 682 } 683 } 684 V_ng_nodes++; 685 if (V_ng_nodes * 2 > V_ng_ID_hmask) 686 ng_ID_rehash(); 687 LIST_INSERT_HEAD(&V_ng_ID_hash[NG_IDHASH_FN(node->nd_ID)], node, 688 nd_idnodes); 689 IDHASH_WUNLOCK(); 690 691 /* Done */ 692 *nodepp = node; 693 return (0); 694 } 695 696 /* 697 * Forceably start the shutdown process on a node. Either call 698 * its shutdown method, or do the default shutdown if there is 699 * no type-specific method. 700 * 701 * We can only be called from a shutdown message, so we know we have 702 * a writer lock, and therefore exclusive access. It also means 703 * that we should not be on the work queue, but we check anyhow. 704 * 705 * Persistent node types must have a type-specific method which 706 * allocates a new node in which case, this one is irretrievably going away, 707 * or cleans up anything it needs, and just makes the node valid again, 708 * in which case we allow the node to survive. 709 * 710 * XXX We need to think of how to tell a persistent node that we 711 * REALLY need to go away because the hardware has gone or we 712 * are rebooting.... etc. 713 */ 714 void 715 ng_rmnode(node_p node, hook_p dummy1, void *dummy2, int dummy3) 716 { 717 hook_p hook; 718 719 /* Check if it's already shutting down */ 720 if ((node->nd_flags & NGF_CLOSING) != 0) 721 return; 722 723 if (node == &ng_deadnode) { 724 printf ("shutdown called on deadnode\n"); 725 return; 726 } 727 728 /* Add an extra reference so it doesn't go away during this */ 729 NG_NODE_REF(node); 730 731 /* 732 * Mark it invalid so any newcomers know not to try use it 733 * Also add our own mark so we can't recurse 734 * note that NGF_INVALID does not do this as it's also set during 735 * creation 736 */ 737 node->nd_flags |= NGF_INVALID|NGF_CLOSING; 738 739 /* If node has its pre-shutdown method, then call it first*/ 740 if (node->nd_type && node->nd_type->close) 741 (*node->nd_type->close)(node); 742 743 /* Notify all remaining connected nodes to disconnect */ 744 while ((hook = LIST_FIRST(&node->nd_hooks)) != NULL) 745 ng_destroy_hook(hook); 746 747 /* 748 * Drain the input queue forceably. 749 * it has no hooks so what's it going to do, bleed on someone? 750 * Theoretically we came here from a queue entry that was added 751 * Just before the queue was closed, so it should be empty anyway. 752 * Also removes us from worklist if needed. 753 */ 754 ng_flush_input_queue(node); 755 756 /* Ask the type if it has anything to do in this case */ 757 if (node->nd_type && node->nd_type->shutdown) { 758 (*node->nd_type->shutdown)(node); 759 if (NG_NODE_IS_VALID(node)) { 760 /* 761 * Well, blow me down if the node code hasn't declared 762 * that it doesn't want to die. 763 * Presumably it is a persistent node. 764 * If we REALLY want it to go away, 765 * e.g. hardware going away, 766 * Our caller should set NGF_REALLY_DIE in nd_flags. 767 */ 768 node->nd_flags &= ~(NGF_INVALID|NGF_CLOSING); 769 NG_NODE_UNREF(node); /* Assume they still have theirs */ 770 return; 771 } 772 } else { /* do the default thing */ 773 NG_NODE_UNREF(node); 774 } 775 776 ng_unname(node); /* basically a NOP these days */ 777 778 /* 779 * Remove extra reference, possibly the last 780 * Possible other holders of references may include 781 * timeout callouts, but theoretically the node's supposed to 782 * have cancelled them. Possibly hardware dependencies may 783 * force a driver to 'linger' with a reference. 784 */ 785 NG_NODE_UNREF(node); 786 } 787 788 /* 789 * Remove a reference to the node, possibly the last. 790 * deadnode always acts as it it were the last. 791 */ 792 void 793 ng_unref_node(node_p node) 794 { 795 796 if (node == &ng_deadnode) 797 return; 798 799 CURVNET_SET(node->nd_vnet); 800 801 if (refcount_release(&node->nd_refs)) { /* we were the last */ 802 803 node->nd_type->refs--; /* XXX maybe should get types lock? */ 804 NAMEHASH_WLOCK(); 805 if (NG_NODE_HAS_NAME(node)) { 806 V_ng_named_nodes--; 807 LIST_REMOVE(node, nd_nodes); 808 } 809 NAMEHASH_WUNLOCK(); 810 811 IDHASH_WLOCK(); 812 V_ng_nodes--; 813 LIST_REMOVE(node, nd_idnodes); 814 IDHASH_WUNLOCK(); 815 816 mtx_destroy(&node->nd_input_queue.q_mtx); 817 NG_FREE_NODE(node); 818 } 819 CURVNET_RESTORE(); 820 } 821 822 /************************************************************************ 823 Node ID handling 824 ************************************************************************/ 825 static node_p 826 ng_ID2noderef(ng_ID_t ID) 827 { 828 node_p node; 829 830 IDHASH_RLOCK(); 831 NG_IDHASH_FIND(ID, node); 832 if (node) 833 NG_NODE_REF(node); 834 IDHASH_RUNLOCK(); 835 return(node); 836 } 837 838 ng_ID_t 839 ng_node2ID(node_p node) 840 { 841 return (node ? NG_NODE_ID(node) : 0); 842 } 843 844 /************************************************************************ 845 Node name handling 846 ************************************************************************/ 847 848 /* 849 * Assign a node a name. 850 */ 851 int 852 ng_name_node(node_p node, const char *name) 853 { 854 uint32_t hash; 855 node_p node2; 856 int i; 857 858 /* Check the name is valid */ 859 for (i = 0; i < NG_NODESIZ; i++) { 860 if (name[i] == '\0' || name[i] == '.' || name[i] == ':') 861 break; 862 } 863 if (i == 0 || name[i] != '\0') { 864 TRAP_ERROR(); 865 return (EINVAL); 866 } 867 if (ng_decodeidname(name) != 0) { /* valid IDs not allowed here */ 868 TRAP_ERROR(); 869 return (EINVAL); 870 } 871 872 NAMEHASH_WLOCK(); 873 if (V_ng_named_nodes * 2 > V_ng_name_hmask) 874 ng_name_rehash(); 875 876 hash = hash32_str(name, HASHINIT) & V_ng_name_hmask; 877 /* Check the name isn't already being used. */ 878 LIST_FOREACH(node2, &V_ng_name_hash[hash], nd_nodes) 879 if (NG_NODE_IS_VALID(node2) && 880 (strcmp(NG_NODE_NAME(node2), name) == 0)) { 881 NAMEHASH_WUNLOCK(); 882 return (EADDRINUSE); 883 } 884 885 if (NG_NODE_HAS_NAME(node)) 886 LIST_REMOVE(node, nd_nodes); 887 else 888 V_ng_named_nodes++; 889 /* Copy it. */ 890 strlcpy(NG_NODE_NAME(node), name, NG_NODESIZ); 891 /* Update name hash. */ 892 LIST_INSERT_HEAD(&V_ng_name_hash[hash], node, nd_nodes); 893 NAMEHASH_WUNLOCK(); 894 895 return (0); 896 } 897 898 /* 899 * Find a node by absolute name. The name should NOT end with ':' 900 * The name "." means "this node" and "[xxx]" means "the node 901 * with ID (ie, at address) xxx". 902 * 903 * Returns the node if found, else NULL. 904 * Eventually should add something faster than a sequential search. 905 * Note it acquires a reference on the node so you can be sure it's still 906 * there. 907 */ 908 node_p 909 ng_name2noderef(node_p here, const char *name) 910 { 911 node_p node; 912 ng_ID_t temp; 913 int hash; 914 915 /* "." means "this node" */ 916 if (strcmp(name, ".") == 0) { 917 NG_NODE_REF(here); 918 return(here); 919 } 920 921 /* Check for name-by-ID */ 922 if ((temp = ng_decodeidname(name)) != 0) { 923 return (ng_ID2noderef(temp)); 924 } 925 926 /* Find node by name. */ 927 hash = hash32_str(name, HASHINIT) & V_ng_name_hmask; 928 NAMEHASH_RLOCK(); 929 LIST_FOREACH(node, &V_ng_name_hash[hash], nd_nodes) 930 if (NG_NODE_IS_VALID(node) && 931 (strcmp(NG_NODE_NAME(node), name) == 0)) { 932 NG_NODE_REF(node); 933 break; 934 } 935 NAMEHASH_RUNLOCK(); 936 937 return (node); 938 } 939 940 /* 941 * Decode an ID name, eg. "[f03034de]". Returns 0 if the 942 * string is not valid, otherwise returns the value. 943 */ 944 static ng_ID_t 945 ng_decodeidname(const char *name) 946 { 947 const int len = strlen(name); 948 char *eptr; 949 u_long val; 950 951 /* Check for proper length, brackets, no leading junk */ 952 if ((len < 3) || (name[0] != '[') || (name[len - 1] != ']') || 953 (!isxdigit(name[1]))) 954 return ((ng_ID_t)0); 955 956 /* Decode number */ 957 val = strtoul(name + 1, &eptr, 16); 958 if ((eptr - name != len - 1) || (val == ULONG_MAX) || (val == 0)) 959 return ((ng_ID_t)0); 960 961 return ((ng_ID_t)val); 962 } 963 964 /* 965 * Remove a name from a node. This should only be called 966 * when shutting down and removing the node. 967 */ 968 void 969 ng_unname(node_p node) 970 { 971 } 972 973 /* 974 * Allocate a bigger name hash. 975 */ 976 static void 977 ng_name_rehash() 978 { 979 struct nodehash *new; 980 uint32_t hash; 981 u_long hmask; 982 node_p node, node2; 983 int i; 984 985 new = hashinit_flags((V_ng_name_hmask + 1) * 2, M_NETGRAPH_NODE, &hmask, 986 HASH_NOWAIT); 987 if (new == NULL) 988 return; 989 990 for (i = 0; i <= V_ng_name_hmask; i++) 991 LIST_FOREACH_SAFE(node, &V_ng_name_hash[i], nd_nodes, node2) { 992 #ifdef INVARIANTS 993 LIST_REMOVE(node, nd_nodes); 994 #endif 995 hash = hash32_str(NG_NODE_NAME(node), HASHINIT) & hmask; 996 LIST_INSERT_HEAD(&new[hash], node, nd_nodes); 997 } 998 999 hashdestroy(V_ng_name_hash, M_NETGRAPH_NODE, V_ng_name_hmask); 1000 V_ng_name_hash = new; 1001 V_ng_name_hmask = hmask; 1002 } 1003 1004 /* 1005 * Allocate a bigger ID hash. 1006 */ 1007 static void 1008 ng_ID_rehash() 1009 { 1010 struct nodehash *new; 1011 uint32_t hash; 1012 u_long hmask; 1013 node_p node, node2; 1014 int i; 1015 1016 new = hashinit_flags((V_ng_ID_hmask + 1) * 2, M_NETGRAPH_NODE, &hmask, 1017 HASH_NOWAIT); 1018 if (new == NULL) 1019 return; 1020 1021 for (i = 0; i <= V_ng_ID_hmask; i++) 1022 LIST_FOREACH_SAFE(node, &V_ng_ID_hash[i], nd_idnodes, node2) { 1023 #ifdef INVARIANTS 1024 LIST_REMOVE(node, nd_idnodes); 1025 #endif 1026 hash = (node->nd_ID % (hmask + 1)); 1027 LIST_INSERT_HEAD(&new[hash], node, nd_idnodes); 1028 } 1029 1030 hashdestroy(V_ng_ID_hash, M_NETGRAPH_NODE, V_ng_name_hmask); 1031 V_ng_ID_hash = new; 1032 V_ng_ID_hmask = hmask; 1033 } 1034 1035 /************************************************************************ 1036 Hook routines 1037 Names are not optional. Hooks are always connected, except for a 1038 brief moment within these routines. On invalidation or during creation 1039 they are connected to the 'dead' hook. 1040 ************************************************************************/ 1041 1042 /* 1043 * Remove a hook reference 1044 */ 1045 void 1046 ng_unref_hook(hook_p hook) 1047 { 1048 1049 if (hook == &ng_deadhook) 1050 return; 1051 1052 if (refcount_release(&hook->hk_refs)) { /* we were the last */ 1053 if (_NG_HOOK_NODE(hook)) /* it'll probably be ng_deadnode */ 1054 _NG_NODE_UNREF((_NG_HOOK_NODE(hook))); 1055 NG_FREE_HOOK(hook); 1056 } 1057 } 1058 1059 /* 1060 * Add an unconnected hook to a node. Only used internally. 1061 * Assumes node is locked. (XXX not yet true ) 1062 */ 1063 static int 1064 ng_add_hook(node_p node, const char *name, hook_p *hookp) 1065 { 1066 hook_p hook; 1067 int error = 0; 1068 1069 /* Check that the given name is good */ 1070 if (name == NULL) { 1071 TRAP_ERROR(); 1072 return (EINVAL); 1073 } 1074 if (ng_findhook(node, name) != NULL) { 1075 TRAP_ERROR(); 1076 return (EEXIST); 1077 } 1078 1079 /* Allocate the hook and link it up */ 1080 NG_ALLOC_HOOK(hook); 1081 if (hook == NULL) { 1082 TRAP_ERROR(); 1083 return (ENOMEM); 1084 } 1085 hook->hk_refs = 1; /* add a reference for us to return */ 1086 hook->hk_flags = HK_INVALID; 1087 hook->hk_peer = &ng_deadhook; /* start off this way */ 1088 hook->hk_node = node; 1089 NG_NODE_REF(node); /* each hook counts as a reference */ 1090 1091 /* Set hook name */ 1092 strlcpy(NG_HOOK_NAME(hook), name, NG_HOOKSIZ); 1093 1094 /* 1095 * Check if the node type code has something to say about it 1096 * If it fails, the unref of the hook will also unref the node. 1097 */ 1098 if (node->nd_type->newhook != NULL) { 1099 if ((error = (*node->nd_type->newhook)(node, hook, name))) { 1100 NG_HOOK_UNREF(hook); /* this frees the hook */ 1101 return (error); 1102 } 1103 } 1104 /* 1105 * The 'type' agrees so far, so go ahead and link it in. 1106 * We'll ask again later when we actually connect the hooks. 1107 */ 1108 LIST_INSERT_HEAD(&node->nd_hooks, hook, hk_hooks); 1109 node->nd_numhooks++; 1110 NG_HOOK_REF(hook); /* one for the node */ 1111 1112 if (hookp) 1113 *hookp = hook; 1114 return (0); 1115 } 1116 1117 /* 1118 * Find a hook 1119 * 1120 * Node types may supply their own optimized routines for finding 1121 * hooks. If none is supplied, we just do a linear search. 1122 * XXX Possibly we should add a reference to the hook? 1123 */ 1124 hook_p 1125 ng_findhook(node_p node, const char *name) 1126 { 1127 hook_p hook; 1128 1129 if (node->nd_type->findhook != NULL) 1130 return (*node->nd_type->findhook)(node, name); 1131 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 1132 if (NG_HOOK_IS_VALID(hook) && 1133 (strcmp(NG_HOOK_NAME(hook), name) == 0)) 1134 return (hook); 1135 } 1136 return (NULL); 1137 } 1138 1139 /* 1140 * Destroy a hook 1141 * 1142 * As hooks are always attached, this really destroys two hooks. 1143 * The one given, and the one attached to it. Disconnect the hooks 1144 * from each other first. We reconnect the peer hook to the 'dead' 1145 * hook so that it can still exist after we depart. We then 1146 * send the peer its own destroy message. This ensures that we only 1147 * interact with the peer's structures when it is locked processing that 1148 * message. We hold a reference to the peer hook so we are guaranteed that 1149 * the peer hook and node are still going to exist until 1150 * we are finished there as the hook holds a ref on the node. 1151 * We run this same code again on the peer hook, but that time it is already 1152 * attached to the 'dead' hook. 1153 * 1154 * This routine is called at all stages of hook creation 1155 * on error detection and must be able to handle any such stage. 1156 */ 1157 void 1158 ng_destroy_hook(hook_p hook) 1159 { 1160 hook_p peer; 1161 node_p node; 1162 1163 if (hook == &ng_deadhook) { /* better safe than sorry */ 1164 printf("ng_destroy_hook called on deadhook\n"); 1165 return; 1166 } 1167 1168 /* 1169 * Protect divorce process with mutex, to avoid races on 1170 * simultaneous disconnect. 1171 */ 1172 TOPOLOGY_WLOCK(); 1173 1174 hook->hk_flags |= HK_INVALID; 1175 1176 peer = NG_HOOK_PEER(hook); 1177 node = NG_HOOK_NODE(hook); 1178 1179 if (peer && (peer != &ng_deadhook)) { 1180 /* 1181 * Set the peer to point to ng_deadhook 1182 * from this moment on we are effectively independent it. 1183 * send it an rmhook message of its own. 1184 */ 1185 peer->hk_peer = &ng_deadhook; /* They no longer know us */ 1186 hook->hk_peer = &ng_deadhook; /* Nor us, them */ 1187 if (NG_HOOK_NODE(peer) == &ng_deadnode) { 1188 /* 1189 * If it's already divorced from a node, 1190 * just free it. 1191 */ 1192 TOPOLOGY_WUNLOCK(); 1193 } else { 1194 TOPOLOGY_WUNLOCK(); 1195 ng_rmhook_self(peer); /* Send it a surprise */ 1196 } 1197 NG_HOOK_UNREF(peer); /* account for peer link */ 1198 NG_HOOK_UNREF(hook); /* account for peer link */ 1199 } else 1200 TOPOLOGY_WUNLOCK(); 1201 1202 TOPOLOGY_NOTOWNED(); 1203 1204 /* 1205 * Remove the hook from the node's list to avoid possible recursion 1206 * in case the disconnection results in node shutdown. 1207 */ 1208 if (node == &ng_deadnode) { /* happens if called from ng_con_nodes() */ 1209 return; 1210 } 1211 LIST_REMOVE(hook, hk_hooks); 1212 node->nd_numhooks--; 1213 if (node->nd_type->disconnect) { 1214 /* 1215 * The type handler may elect to destroy the node so don't 1216 * trust its existence after this point. (except 1217 * that we still hold a reference on it. (which we 1218 * inherrited from the hook we are destroying) 1219 */ 1220 (*node->nd_type->disconnect) (hook); 1221 } 1222 1223 /* 1224 * Note that because we will point to ng_deadnode, the original node 1225 * is not decremented automatically so we do that manually. 1226 */ 1227 _NG_HOOK_NODE(hook) = &ng_deadnode; 1228 NG_NODE_UNREF(node); /* We no longer point to it so adjust count */ 1229 NG_HOOK_UNREF(hook); /* Account for linkage (in list) to node */ 1230 } 1231 1232 /* 1233 * Take two hooks on a node and merge the connection so that the given node 1234 * is effectively bypassed. 1235 */ 1236 int 1237 ng_bypass(hook_p hook1, hook_p hook2) 1238 { 1239 if (hook1->hk_node != hook2->hk_node) { 1240 TRAP_ERROR(); 1241 return (EINVAL); 1242 } 1243 TOPOLOGY_WLOCK(); 1244 if (NG_HOOK_NOT_VALID(hook1) || NG_HOOK_NOT_VALID(hook2)) { 1245 TOPOLOGY_WUNLOCK(); 1246 return (EINVAL); 1247 } 1248 hook1->hk_peer->hk_peer = hook2->hk_peer; 1249 hook2->hk_peer->hk_peer = hook1->hk_peer; 1250 1251 hook1->hk_peer = &ng_deadhook; 1252 hook2->hk_peer = &ng_deadhook; 1253 TOPOLOGY_WUNLOCK(); 1254 1255 NG_HOOK_UNREF(hook1); 1256 NG_HOOK_UNREF(hook2); 1257 1258 /* XXX If we ever cache methods on hooks update them as well */ 1259 ng_destroy_hook(hook1); 1260 ng_destroy_hook(hook2); 1261 return (0); 1262 } 1263 1264 /* 1265 * Install a new netgraph type 1266 */ 1267 int 1268 ng_newtype(struct ng_type *tp) 1269 { 1270 const size_t namelen = strlen(tp->name); 1271 1272 /* Check version and type name fields */ 1273 if ((tp->version != NG_ABI_VERSION) || (namelen == 0) || 1274 (namelen >= NG_TYPESIZ)) { 1275 TRAP_ERROR(); 1276 if (tp->version != NG_ABI_VERSION) { 1277 printf("Netgraph: Node type rejected. ABI mismatch. " 1278 "Suggest recompile\n"); 1279 } 1280 return (EINVAL); 1281 } 1282 1283 /* Check for name collision */ 1284 if (ng_findtype(tp->name) != NULL) { 1285 TRAP_ERROR(); 1286 return (EEXIST); 1287 } 1288 1289 /* Link in new type */ 1290 TYPELIST_WLOCK(); 1291 LIST_INSERT_HEAD(&ng_typelist, tp, types); 1292 tp->refs = 1; /* first ref is linked list */ 1293 TYPELIST_WUNLOCK(); 1294 return (0); 1295 } 1296 1297 /* 1298 * unlink a netgraph type 1299 * If no examples exist 1300 */ 1301 int 1302 ng_rmtype(struct ng_type *tp) 1303 { 1304 /* Check for name collision */ 1305 if (tp->refs != 1) { 1306 TRAP_ERROR(); 1307 return (EBUSY); 1308 } 1309 1310 /* Unlink type */ 1311 TYPELIST_WLOCK(); 1312 LIST_REMOVE(tp, types); 1313 TYPELIST_WUNLOCK(); 1314 return (0); 1315 } 1316 1317 /* 1318 * Look for a type of the name given 1319 */ 1320 struct ng_type * 1321 ng_findtype(const char *typename) 1322 { 1323 struct ng_type *type; 1324 1325 TYPELIST_RLOCK(); 1326 LIST_FOREACH(type, &ng_typelist, types) { 1327 if (strcmp(type->name, typename) == 0) 1328 break; 1329 } 1330 TYPELIST_RUNLOCK(); 1331 return (type); 1332 } 1333 1334 /************************************************************************ 1335 Composite routines 1336 ************************************************************************/ 1337 /* 1338 * Connect two nodes using the specified hooks, using queued functions. 1339 */ 1340 static int 1341 ng_con_part3(node_p node, item_p item, hook_p hook) 1342 { 1343 int error = 0; 1344 1345 /* 1346 * When we run, we know that the node 'node' is locked for us. 1347 * Our caller has a reference on the hook. 1348 * Our caller has a reference on the node. 1349 * (In this case our caller is ng_apply_item() ). 1350 * The peer hook has a reference on the hook. 1351 * We are all set up except for the final call to the node, and 1352 * the clearing of the INVALID flag. 1353 */ 1354 if (NG_HOOK_NODE(hook) == &ng_deadnode) { 1355 /* 1356 * The node must have been freed again since we last visited 1357 * here. ng_destry_hook() has this effect but nothing else does. 1358 * We should just release our references and 1359 * free anything we can think of. 1360 * Since we know it's been destroyed, and it's our caller 1361 * that holds the references, just return. 1362 */ 1363 ERROUT(ENOENT); 1364 } 1365 if (hook->hk_node->nd_type->connect) { 1366 if ((error = (*hook->hk_node->nd_type->connect) (hook))) { 1367 ng_destroy_hook(hook); /* also zaps peer */ 1368 printf("failed in ng_con_part3()\n"); 1369 ERROUT(error); 1370 } 1371 } 1372 /* 1373 * XXX this is wrong for SMP. Possibly we need 1374 * to separate out 'create' and 'invalid' flags. 1375 * should only set flags on hooks we have locked under our node. 1376 */ 1377 hook->hk_flags &= ~HK_INVALID; 1378 done: 1379 NG_FREE_ITEM(item); 1380 return (error); 1381 } 1382 1383 static int 1384 ng_con_part2(node_p node, item_p item, hook_p hook) 1385 { 1386 hook_p peer; 1387 int error = 0; 1388 1389 /* 1390 * When we run, we know that the node 'node' is locked for us. 1391 * Our caller has a reference on the hook. 1392 * Our caller has a reference on the node. 1393 * (In this case our caller is ng_apply_item() ). 1394 * The peer hook has a reference on the hook. 1395 * our node pointer points to the 'dead' node. 1396 * First check the hook name is unique. 1397 * Should not happen because we checked before queueing this. 1398 */ 1399 if (ng_findhook(node, NG_HOOK_NAME(hook)) != NULL) { 1400 TRAP_ERROR(); 1401 ng_destroy_hook(hook); /* should destroy peer too */ 1402 printf("failed in ng_con_part2()\n"); 1403 ERROUT(EEXIST); 1404 } 1405 /* 1406 * Check if the node type code has something to say about it 1407 * If it fails, the unref of the hook will also unref the attached node, 1408 * however since that node is 'ng_deadnode' this will do nothing. 1409 * The peer hook will also be destroyed. 1410 */ 1411 if (node->nd_type->newhook != NULL) { 1412 if ((error = (*node->nd_type->newhook)(node, hook, 1413 hook->hk_name))) { 1414 ng_destroy_hook(hook); /* should destroy peer too */ 1415 printf("failed in ng_con_part2()\n"); 1416 ERROUT(error); 1417 } 1418 } 1419 1420 /* 1421 * The 'type' agrees so far, so go ahead and link it in. 1422 * We'll ask again later when we actually connect the hooks. 1423 */ 1424 hook->hk_node = node; /* just overwrite ng_deadnode */ 1425 NG_NODE_REF(node); /* each hook counts as a reference */ 1426 LIST_INSERT_HEAD(&node->nd_hooks, hook, hk_hooks); 1427 node->nd_numhooks++; 1428 NG_HOOK_REF(hook); /* one for the node */ 1429 1430 /* 1431 * We now have a symmetrical situation, where both hooks have been 1432 * linked to their nodes, the newhook methods have been called 1433 * And the references are all correct. The hooks are still marked 1434 * as invalid, as we have not called the 'connect' methods 1435 * yet. 1436 * We can call the local one immediately as we have the 1437 * node locked, but we need to queue the remote one. 1438 */ 1439 if (hook->hk_node->nd_type->connect) { 1440 if ((error = (*hook->hk_node->nd_type->connect) (hook))) { 1441 ng_destroy_hook(hook); /* also zaps peer */ 1442 printf("failed in ng_con_part2(A)\n"); 1443 ERROUT(error); 1444 } 1445 } 1446 1447 /* 1448 * Acquire topo mutex to avoid race with ng_destroy_hook(). 1449 */ 1450 TOPOLOGY_RLOCK(); 1451 peer = hook->hk_peer; 1452 if (peer == &ng_deadhook) { 1453 TOPOLOGY_RUNLOCK(); 1454 printf("failed in ng_con_part2(B)\n"); 1455 ng_destroy_hook(hook); 1456 ERROUT(ENOENT); 1457 } 1458 TOPOLOGY_RUNLOCK(); 1459 1460 if ((error = ng_send_fn2(peer->hk_node, peer, item, &ng_con_part3, 1461 NULL, 0, NG_REUSE_ITEM))) { 1462 printf("failed in ng_con_part2(C)\n"); 1463 ng_destroy_hook(hook); /* also zaps peer */ 1464 return (error); /* item was consumed. */ 1465 } 1466 hook->hk_flags &= ~HK_INVALID; /* need both to be able to work */ 1467 return (0); /* item was consumed. */ 1468 done: 1469 NG_FREE_ITEM(item); 1470 return (error); 1471 } 1472 1473 /* 1474 * Connect this node with another node. We assume that this node is 1475 * currently locked, as we are only called from an NGM_CONNECT message. 1476 */ 1477 static int 1478 ng_con_nodes(item_p item, node_p node, const char *name, 1479 node_p node2, const char *name2) 1480 { 1481 int error; 1482 hook_p hook; 1483 hook_p hook2; 1484 1485 if (ng_findhook(node2, name2) != NULL) { 1486 return(EEXIST); 1487 } 1488 if ((error = ng_add_hook(node, name, &hook))) /* gives us a ref */ 1489 return (error); 1490 /* Allocate the other hook and link it up */ 1491 NG_ALLOC_HOOK(hook2); 1492 if (hook2 == NULL) { 1493 TRAP_ERROR(); 1494 ng_destroy_hook(hook); /* XXX check ref counts so far */ 1495 NG_HOOK_UNREF(hook); /* including our ref */ 1496 return (ENOMEM); 1497 } 1498 hook2->hk_refs = 1; /* start with a reference for us. */ 1499 hook2->hk_flags = HK_INVALID; 1500 hook2->hk_peer = hook; /* Link the two together */ 1501 hook->hk_peer = hook2; 1502 NG_HOOK_REF(hook); /* Add a ref for the peer to each*/ 1503 NG_HOOK_REF(hook2); 1504 hook2->hk_node = &ng_deadnode; 1505 strlcpy(NG_HOOK_NAME(hook2), name2, NG_HOOKSIZ); 1506 1507 /* 1508 * Queue the function above. 1509 * Procesing continues in that function in the lock context of 1510 * the other node. 1511 */ 1512 if ((error = ng_send_fn2(node2, hook2, item, &ng_con_part2, NULL, 0, 1513 NG_NOFLAGS))) { 1514 printf("failed in ng_con_nodes(): %d\n", error); 1515 ng_destroy_hook(hook); /* also zaps peer */ 1516 } 1517 1518 NG_HOOK_UNREF(hook); /* Let each hook go if it wants to */ 1519 NG_HOOK_UNREF(hook2); 1520 return (error); 1521 } 1522 1523 /* 1524 * Make a peer and connect. 1525 * We assume that the local node is locked. 1526 * The new node probably doesn't need a lock until 1527 * it has a hook, because it cannot really have any work until then, 1528 * but we should think about it a bit more. 1529 * 1530 * The problem may come if the other node also fires up 1531 * some hardware or a timer or some other source of activation, 1532 * also it may already get a command msg via it's ID. 1533 * 1534 * We could use the same method as ng_con_nodes() but we'd have 1535 * to add ability to remove the node when failing. (Not hard, just 1536 * make arg1 point to the node to remove). 1537 * Unless of course we just ignore failure to connect and leave 1538 * an unconnected node? 1539 */ 1540 static int 1541 ng_mkpeer(node_p node, const char *name, const char *name2, char *type) 1542 { 1543 node_p node2; 1544 hook_p hook1, hook2; 1545 int error; 1546 1547 if ((error = ng_make_node(type, &node2))) { 1548 return (error); 1549 } 1550 1551 if ((error = ng_add_hook(node, name, &hook1))) { /* gives us a ref */ 1552 ng_rmnode(node2, NULL, NULL, 0); 1553 return (error); 1554 } 1555 1556 if ((error = ng_add_hook(node2, name2, &hook2))) { 1557 ng_rmnode(node2, NULL, NULL, 0); 1558 ng_destroy_hook(hook1); 1559 NG_HOOK_UNREF(hook1); 1560 return (error); 1561 } 1562 1563 /* 1564 * Actually link the two hooks together. 1565 */ 1566 hook1->hk_peer = hook2; 1567 hook2->hk_peer = hook1; 1568 1569 /* Each hook is referenced by the other */ 1570 NG_HOOK_REF(hook1); 1571 NG_HOOK_REF(hook2); 1572 1573 /* Give each node the opportunity to veto the pending connection */ 1574 if (hook1->hk_node->nd_type->connect) { 1575 error = (*hook1->hk_node->nd_type->connect) (hook1); 1576 } 1577 1578 if ((error == 0) && hook2->hk_node->nd_type->connect) { 1579 error = (*hook2->hk_node->nd_type->connect) (hook2); 1580 } 1581 1582 /* 1583 * drop the references we were holding on the two hooks. 1584 */ 1585 if (error) { 1586 ng_destroy_hook(hook2); /* also zaps hook1 */ 1587 ng_rmnode(node2, NULL, NULL, 0); 1588 } else { 1589 /* As a last act, allow the hooks to be used */ 1590 hook1->hk_flags &= ~HK_INVALID; 1591 hook2->hk_flags &= ~HK_INVALID; 1592 } 1593 NG_HOOK_UNREF(hook1); 1594 NG_HOOK_UNREF(hook2); 1595 return (error); 1596 } 1597 1598 /************************************************************************ 1599 Utility routines to send self messages 1600 ************************************************************************/ 1601 1602 /* Shut this node down as soon as everyone is clear of it */ 1603 /* Should add arg "immediately" to jump the queue */ 1604 int 1605 ng_rmnode_self(node_p node) 1606 { 1607 int error; 1608 1609 if (node == &ng_deadnode) 1610 return (0); 1611 node->nd_flags |= NGF_INVALID; 1612 if (node->nd_flags & NGF_CLOSING) 1613 return (0); 1614 1615 error = ng_send_fn(node, NULL, &ng_rmnode, NULL, 0); 1616 return (error); 1617 } 1618 1619 static void 1620 ng_rmhook_part2(node_p node, hook_p hook, void *arg1, int arg2) 1621 { 1622 ng_destroy_hook(hook); 1623 return ; 1624 } 1625 1626 int 1627 ng_rmhook_self(hook_p hook) 1628 { 1629 int error; 1630 node_p node = NG_HOOK_NODE(hook); 1631 1632 if (node == &ng_deadnode) 1633 return (0); 1634 1635 error = ng_send_fn(node, hook, &ng_rmhook_part2, NULL, 0); 1636 return (error); 1637 } 1638 1639 /*********************************************************************** 1640 * Parse and verify a string of the form: <NODE:><PATH> 1641 * 1642 * Such a string can refer to a specific node or a specific hook 1643 * on a specific node, depending on how you look at it. In the 1644 * latter case, the PATH component must not end in a dot. 1645 * 1646 * Both <NODE:> and <PATH> are optional. The <PATH> is a string 1647 * of hook names separated by dots. This breaks out the original 1648 * string, setting *nodep to "NODE" (or NULL if none) and *pathp 1649 * to "PATH" (or NULL if degenerate). Also, *hookp will point to 1650 * the final hook component of <PATH>, if any, otherwise NULL. 1651 * 1652 * This returns -1 if the path is malformed. The char ** are optional. 1653 ***********************************************************************/ 1654 int 1655 ng_path_parse(char *addr, char **nodep, char **pathp, char **hookp) 1656 { 1657 char *node, *path, *hook; 1658 int k; 1659 1660 /* 1661 * Extract absolute NODE, if any 1662 */ 1663 for (path = addr; *path && *path != ':'; path++); 1664 if (*path) { 1665 node = addr; /* Here's the NODE */ 1666 *path++ = '\0'; /* Here's the PATH */ 1667 1668 /* Node name must not be empty */ 1669 if (!*node) 1670 return -1; 1671 1672 /* A name of "." is OK; otherwise '.' not allowed */ 1673 if (strcmp(node, ".") != 0) { 1674 for (k = 0; node[k]; k++) 1675 if (node[k] == '.') 1676 return -1; 1677 } 1678 } else { 1679 node = NULL; /* No absolute NODE */ 1680 path = addr; /* Here's the PATH */ 1681 } 1682 1683 /* Snoop for illegal characters in PATH */ 1684 for (k = 0; path[k]; k++) 1685 if (path[k] == ':') 1686 return -1; 1687 1688 /* Check for no repeated dots in PATH */ 1689 for (k = 0; path[k]; k++) 1690 if (path[k] == '.' && path[k + 1] == '.') 1691 return -1; 1692 1693 /* Remove extra (degenerate) dots from beginning or end of PATH */ 1694 if (path[0] == '.') 1695 path++; 1696 if (*path && path[strlen(path) - 1] == '.') 1697 path[strlen(path) - 1] = 0; 1698 1699 /* If PATH has a dot, then we're not talking about a hook */ 1700 if (*path) { 1701 for (hook = path, k = 0; path[k]; k++) 1702 if (path[k] == '.') { 1703 hook = NULL; 1704 break; 1705 } 1706 } else 1707 path = hook = NULL; 1708 1709 /* Done */ 1710 if (nodep) 1711 *nodep = node; 1712 if (pathp) 1713 *pathp = path; 1714 if (hookp) 1715 *hookp = hook; 1716 return (0); 1717 } 1718 1719 /* 1720 * Given a path, which may be absolute or relative, and a starting node, 1721 * return the destination node. 1722 */ 1723 int 1724 ng_path2noderef(node_p here, const char *address, node_p *destp, 1725 hook_p *lasthook) 1726 { 1727 char fullpath[NG_PATHSIZ]; 1728 char *nodename, *path; 1729 node_p node, oldnode; 1730 1731 /* Initialize */ 1732 if (destp == NULL) { 1733 TRAP_ERROR(); 1734 return EINVAL; 1735 } 1736 *destp = NULL; 1737 1738 /* Make a writable copy of address for ng_path_parse() */ 1739 strncpy(fullpath, address, sizeof(fullpath) - 1); 1740 fullpath[sizeof(fullpath) - 1] = '\0'; 1741 1742 /* Parse out node and sequence of hooks */ 1743 if (ng_path_parse(fullpath, &nodename, &path, NULL) < 0) { 1744 TRAP_ERROR(); 1745 return EINVAL; 1746 } 1747 1748 /* 1749 * For an absolute address, jump to the starting node. 1750 * Note that this holds a reference on the node for us. 1751 * Don't forget to drop the reference if we don't need it. 1752 */ 1753 if (nodename) { 1754 node = ng_name2noderef(here, nodename); 1755 if (node == NULL) { 1756 TRAP_ERROR(); 1757 return (ENOENT); 1758 } 1759 } else { 1760 if (here == NULL) { 1761 TRAP_ERROR(); 1762 return (EINVAL); 1763 } 1764 node = here; 1765 NG_NODE_REF(node); 1766 } 1767 1768 if (path == NULL) { 1769 if (lasthook != NULL) 1770 *lasthook = NULL; 1771 *destp = node; 1772 return (0); 1773 } 1774 1775 /* 1776 * Now follow the sequence of hooks 1777 * 1778 * XXXGL: The path may demolish as we go the sequence, but if 1779 * we hold the topology mutex at critical places, then, I hope, 1780 * we would always have valid pointers in hand, although the 1781 * path behind us may no longer exist. 1782 */ 1783 for (;;) { 1784 hook_p hook; 1785 char *segment; 1786 1787 /* 1788 * Break out the next path segment. Replace the dot we just 1789 * found with a NUL; "path" points to the next segment (or the 1790 * NUL at the end). 1791 */ 1792 for (segment = path; *path != '\0'; path++) { 1793 if (*path == '.') { 1794 *path++ = '\0'; 1795 break; 1796 } 1797 } 1798 1799 /* We have a segment, so look for a hook by that name */ 1800 hook = ng_findhook(node, segment); 1801 1802 TOPOLOGY_WLOCK(); 1803 /* Can't get there from here... */ 1804 if (hook == NULL || NG_HOOK_PEER(hook) == NULL || 1805 NG_HOOK_NOT_VALID(hook) || 1806 NG_HOOK_NOT_VALID(NG_HOOK_PEER(hook))) { 1807 TRAP_ERROR(); 1808 NG_NODE_UNREF(node); 1809 TOPOLOGY_WUNLOCK(); 1810 return (ENOENT); 1811 } 1812 1813 /* 1814 * Hop on over to the next node 1815 * XXX 1816 * Big race conditions here as hooks and nodes go away 1817 * *** Idea.. store an ng_ID_t in each hook and use that 1818 * instead of the direct hook in this crawl? 1819 */ 1820 oldnode = node; 1821 if ((node = NG_PEER_NODE(hook))) 1822 NG_NODE_REF(node); /* XXX RACE */ 1823 NG_NODE_UNREF(oldnode); /* XXX another race */ 1824 if (NG_NODE_NOT_VALID(node)) { 1825 NG_NODE_UNREF(node); /* XXX more races */ 1826 TOPOLOGY_WUNLOCK(); 1827 TRAP_ERROR(); 1828 return (ENXIO); 1829 } 1830 1831 if (*path == '\0') { 1832 if (lasthook != NULL) { 1833 if (hook != NULL) { 1834 *lasthook = NG_HOOK_PEER(hook); 1835 NG_HOOK_REF(*lasthook); 1836 } else 1837 *lasthook = NULL; 1838 } 1839 TOPOLOGY_WUNLOCK(); 1840 *destp = node; 1841 return (0); 1842 } 1843 TOPOLOGY_WUNLOCK(); 1844 } 1845 } 1846 1847 /***************************************************************\ 1848 * Input queue handling. 1849 * All activities are submitted to the node via the input queue 1850 * which implements a multiple-reader/single-writer gate. 1851 * Items which cannot be handled immediately are queued. 1852 * 1853 * read-write queue locking inline functions * 1854 \***************************************************************/ 1855 1856 static __inline void ng_queue_rw(node_p node, item_p item, int rw); 1857 static __inline item_p ng_dequeue(node_p node, int *rw); 1858 static __inline item_p ng_acquire_read(node_p node, item_p item); 1859 static __inline item_p ng_acquire_write(node_p node, item_p item); 1860 static __inline void ng_leave_read(node_p node); 1861 static __inline void ng_leave_write(node_p node); 1862 1863 /* 1864 * Definition of the bits fields in the ng_queue flag word. 1865 * Defined here rather than in netgraph.h because no-one should fiddle 1866 * with them. 1867 * 1868 * The ordering here may be important! don't shuffle these. 1869 */ 1870 /*- 1871 Safety Barrier--------+ (adjustable to suit taste) (not used yet) 1872 | 1873 V 1874 +-------+-------+-------+-------+-------+-------+-------+-------+ 1875 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1876 | |A|c|t|i|v|e| |R|e|a|d|e|r| |C|o|u|n|t| | | | | | | | | |P|A| 1877 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |O|W| 1878 +-------+-------+-------+-------+-------+-------+-------+-------+ 1879 \___________________________ ____________________________/ | | 1880 V | | 1881 [active reader count] | | 1882 | | 1883 Operation Pending -------------------------------+ | 1884 | 1885 Active Writer ---------------------------------------+ 1886 1887 Node queue has such semantics: 1888 - All flags modifications are atomic. 1889 - Reader count can be incremented only if there is no writer or pending flags. 1890 As soon as this can't be done with single operation, it is implemented with 1891 spin loop and atomic_cmpset(). 1892 - Writer flag can be set only if there is no any bits set. 1893 It is implemented with atomic_cmpset(). 1894 - Pending flag can be set any time, but to avoid collision on queue processing 1895 all queue fields are protected by the mutex. 1896 - Queue processing thread reads queue holding the mutex, but releases it while 1897 processing. When queue is empty pending flag is removed. 1898 */ 1899 1900 #define WRITER_ACTIVE 0x00000001 1901 #define OP_PENDING 0x00000002 1902 #define READER_INCREMENT 0x00000004 1903 #define READER_MASK 0xfffffffc /* Not valid if WRITER_ACTIVE is set */ 1904 #define SAFETY_BARRIER 0x00100000 /* 128K items queued should be enough */ 1905 1906 /* Defines of more elaborate states on the queue */ 1907 /* Mask of bits a new read cares about */ 1908 #define NGQ_RMASK (WRITER_ACTIVE|OP_PENDING) 1909 1910 /* Mask of bits a new write cares about */ 1911 #define NGQ_WMASK (NGQ_RMASK|READER_MASK) 1912 1913 /* Test to decide if there is something on the queue. */ 1914 #define QUEUE_ACTIVE(QP) ((QP)->q_flags & OP_PENDING) 1915 1916 /* How to decide what the next queued item is. */ 1917 #define HEAD_IS_READER(QP) NGI_QUEUED_READER(STAILQ_FIRST(&(QP)->queue)) 1918 #define HEAD_IS_WRITER(QP) NGI_QUEUED_WRITER(STAILQ_FIRST(&(QP)->queue)) /* notused */ 1919 1920 /* Read the status to decide if the next item on the queue can now run. */ 1921 #define QUEUED_READER_CAN_PROCEED(QP) \ 1922 (((QP)->q_flags & (NGQ_RMASK & ~OP_PENDING)) == 0) 1923 #define QUEUED_WRITER_CAN_PROCEED(QP) \ 1924 (((QP)->q_flags & (NGQ_WMASK & ~OP_PENDING)) == 0) 1925 1926 /* Is there a chance of getting ANY work off the queue? */ 1927 #define NEXT_QUEUED_ITEM_CAN_PROCEED(QP) \ 1928 ((HEAD_IS_READER(QP)) ? QUEUED_READER_CAN_PROCEED(QP) : \ 1929 QUEUED_WRITER_CAN_PROCEED(QP)) 1930 1931 #define NGQRW_R 0 1932 #define NGQRW_W 1 1933 1934 #define NGQ2_WORKQ 0x00000001 1935 1936 /* 1937 * Taking into account the current state of the queue and node, possibly take 1938 * the next entry off the queue and return it. Return NULL if there was 1939 * nothing we could return, either because there really was nothing there, or 1940 * because the node was in a state where it cannot yet process the next item 1941 * on the queue. 1942 */ 1943 static __inline item_p 1944 ng_dequeue(node_p node, int *rw) 1945 { 1946 item_p item; 1947 struct ng_queue *ngq = &node->nd_input_queue; 1948 1949 /* This MUST be called with the mutex held. */ 1950 mtx_assert(&ngq->q_mtx, MA_OWNED); 1951 1952 /* If there is nothing queued, then just return. */ 1953 if (!QUEUE_ACTIVE(ngq)) { 1954 CTR4(KTR_NET, "%20s: node [%x] (%p) queue empty; " 1955 "queue flags 0x%lx", __func__, 1956 node->nd_ID, node, ngq->q_flags); 1957 return (NULL); 1958 } 1959 1960 /* 1961 * From here, we can assume there is a head item. 1962 * We need to find out what it is and if it can be dequeued, given 1963 * the current state of the node. 1964 */ 1965 if (HEAD_IS_READER(ngq)) { 1966 while (1) { 1967 long t = ngq->q_flags; 1968 if (t & WRITER_ACTIVE) { 1969 /* There is writer, reader can't proceed. */ 1970 CTR4(KTR_NET, "%20s: node [%x] (%p) queued " 1971 "reader can't proceed; queue flags 0x%lx", 1972 __func__, node->nd_ID, node, t); 1973 return (NULL); 1974 } 1975 if (atomic_cmpset_acq_int(&ngq->q_flags, t, 1976 t + READER_INCREMENT)) 1977 break; 1978 cpu_spinwait(); 1979 } 1980 /* We have got reader lock for the node. */ 1981 *rw = NGQRW_R; 1982 } else if (atomic_cmpset_acq_int(&ngq->q_flags, OP_PENDING, 1983 OP_PENDING + WRITER_ACTIVE)) { 1984 /* We have got writer lock for the node. */ 1985 *rw = NGQRW_W; 1986 } else { 1987 /* There is somebody other, writer can't proceed. */ 1988 CTR4(KTR_NET, "%20s: node [%x] (%p) queued writer can't " 1989 "proceed; queue flags 0x%lx", __func__, node->nd_ID, node, 1990 ngq->q_flags); 1991 return (NULL); 1992 } 1993 1994 /* 1995 * Now we dequeue the request (whatever it may be) and correct the 1996 * pending flags and the next and last pointers. 1997 */ 1998 item = STAILQ_FIRST(&ngq->queue); 1999 STAILQ_REMOVE_HEAD(&ngq->queue, el_next); 2000 if (STAILQ_EMPTY(&ngq->queue)) 2001 atomic_clear_int(&ngq->q_flags, OP_PENDING); 2002 CTR6(KTR_NET, "%20s: node [%x] (%p) returning item %p as %s; queue " 2003 "flags 0x%lx", __func__, node->nd_ID, node, item, *rw ? "WRITER" : 2004 "READER", ngq->q_flags); 2005 return (item); 2006 } 2007 2008 /* 2009 * Queue a packet to be picked up later by someone else. 2010 * If the queue could be run now, add node to the queue handler's worklist. 2011 */ 2012 static __inline void 2013 ng_queue_rw(node_p node, item_p item, int rw) 2014 { 2015 struct ng_queue *ngq = &node->nd_input_queue; 2016 if (rw == NGQRW_W) 2017 NGI_SET_WRITER(item); 2018 else 2019 NGI_SET_READER(item); 2020 item->depth = 1; 2021 2022 NG_QUEUE_LOCK(ngq); 2023 /* Set OP_PENDING flag and enqueue the item. */ 2024 atomic_set_int(&ngq->q_flags, OP_PENDING); 2025 STAILQ_INSERT_TAIL(&ngq->queue, item, el_next); 2026 2027 CTR5(KTR_NET, "%20s: node [%x] (%p) queued item %p as %s", __func__, 2028 node->nd_ID, node, item, rw ? "WRITER" : "READER" ); 2029 2030 /* 2031 * We can take the worklist lock with the node locked 2032 * BUT NOT THE REVERSE! 2033 */ 2034 if (NEXT_QUEUED_ITEM_CAN_PROCEED(ngq)) 2035 ng_worklist_add(node); 2036 NG_QUEUE_UNLOCK(ngq); 2037 } 2038 2039 /* Acquire reader lock on node. If node is busy, queue the packet. */ 2040 static __inline item_p 2041 ng_acquire_read(node_p node, item_p item) 2042 { 2043 KASSERT(node != &ng_deadnode, 2044 ("%s: working on deadnode", __func__)); 2045 2046 /* Reader needs node without writer and pending items. */ 2047 for (;;) { 2048 long t = node->nd_input_queue.q_flags; 2049 if (t & NGQ_RMASK) 2050 break; /* Node is not ready for reader. */ 2051 if (atomic_cmpset_acq_int(&node->nd_input_queue.q_flags, t, 2052 t + READER_INCREMENT)) { 2053 /* Successfully grabbed node */ 2054 CTR4(KTR_NET, "%20s: node [%x] (%p) acquired item %p", 2055 __func__, node->nd_ID, node, item); 2056 return (item); 2057 } 2058 cpu_spinwait(); 2059 } 2060 2061 /* Queue the request for later. */ 2062 ng_queue_rw(node, item, NGQRW_R); 2063 2064 return (NULL); 2065 } 2066 2067 /* Acquire writer lock on node. If node is busy, queue the packet. */ 2068 static __inline item_p 2069 ng_acquire_write(node_p node, item_p item) 2070 { 2071 KASSERT(node != &ng_deadnode, 2072 ("%s: working on deadnode", __func__)); 2073 2074 /* Writer needs completely idle node. */ 2075 if (atomic_cmpset_acq_int(&node->nd_input_queue.q_flags, 0, 2076 WRITER_ACTIVE)) { 2077 /* Successfully grabbed node */ 2078 CTR4(KTR_NET, "%20s: node [%x] (%p) acquired item %p", 2079 __func__, node->nd_ID, node, item); 2080 return (item); 2081 } 2082 2083 /* Queue the request for later. */ 2084 ng_queue_rw(node, item, NGQRW_W); 2085 2086 return (NULL); 2087 } 2088 2089 #if 0 2090 static __inline item_p 2091 ng_upgrade_write(node_p node, item_p item) 2092 { 2093 struct ng_queue *ngq = &node->nd_input_queue; 2094 KASSERT(node != &ng_deadnode, 2095 ("%s: working on deadnode", __func__)); 2096 2097 NGI_SET_WRITER(item); 2098 2099 NG_QUEUE_LOCK(ngq); 2100 2101 /* 2102 * There will never be no readers as we are there ourselves. 2103 * Set the WRITER_ACTIVE flags ASAP to block out fast track readers. 2104 * The caller we are running from will call ng_leave_read() 2105 * soon, so we must account for that. We must leave again with the 2106 * READER lock. If we find other readers, then 2107 * queue the request for later. However "later" may be rignt now 2108 * if there are no readers. We don't really care if there are queued 2109 * items as we will bypass them anyhow. 2110 */ 2111 atomic_add_int(&ngq->q_flags, WRITER_ACTIVE - READER_INCREMENT); 2112 if ((ngq->q_flags & (NGQ_WMASK & ~OP_PENDING)) == WRITER_ACTIVE) { 2113 NG_QUEUE_UNLOCK(ngq); 2114 2115 /* It's just us, act on the item. */ 2116 /* will NOT drop writer lock when done */ 2117 ng_apply_item(node, item, 0); 2118 2119 /* 2120 * Having acted on the item, atomically 2121 * downgrade back to READER and finish up. 2122 */ 2123 atomic_add_int(&ngq->q_flags, READER_INCREMENT - WRITER_ACTIVE); 2124 2125 /* Our caller will call ng_leave_read() */ 2126 return; 2127 } 2128 /* 2129 * It's not just us active, so queue us AT THE HEAD. 2130 * "Why?" I hear you ask. 2131 * Put us at the head of the queue as we've already been 2132 * through it once. If there is nothing else waiting, 2133 * set the correct flags. 2134 */ 2135 if (STAILQ_EMPTY(&ngq->queue)) { 2136 /* We've gone from, 0 to 1 item in the queue */ 2137 atomic_set_int(&ngq->q_flags, OP_PENDING); 2138 2139 CTR3(KTR_NET, "%20s: node [%x] (%p) set OP_PENDING", __func__, 2140 node->nd_ID, node); 2141 }; 2142 STAILQ_INSERT_HEAD(&ngq->queue, item, el_next); 2143 CTR4(KTR_NET, "%20s: node [%x] (%p) requeued item %p as WRITER", 2144 __func__, node->nd_ID, node, item ); 2145 2146 /* Reverse what we did above. That downgrades us back to reader */ 2147 atomic_add_int(&ngq->q_flags, READER_INCREMENT - WRITER_ACTIVE); 2148 if (QUEUE_ACTIVE(ngq) && NEXT_QUEUED_ITEM_CAN_PROCEED(ngq)) 2149 ng_worklist_add(node); 2150 NG_QUEUE_UNLOCK(ngq); 2151 2152 return; 2153 } 2154 #endif 2155 2156 /* Release reader lock. */ 2157 static __inline void 2158 ng_leave_read(node_p node) 2159 { 2160 atomic_subtract_rel_int(&node->nd_input_queue.q_flags, READER_INCREMENT); 2161 } 2162 2163 /* Release writer lock. */ 2164 static __inline void 2165 ng_leave_write(node_p node) 2166 { 2167 atomic_clear_rel_int(&node->nd_input_queue.q_flags, WRITER_ACTIVE); 2168 } 2169 2170 /* Purge node queue. Called on node shutdown. */ 2171 static void 2172 ng_flush_input_queue(node_p node) 2173 { 2174 struct ng_queue *ngq = &node->nd_input_queue; 2175 item_p item; 2176 2177 NG_QUEUE_LOCK(ngq); 2178 while ((item = STAILQ_FIRST(&ngq->queue)) != NULL) { 2179 STAILQ_REMOVE_HEAD(&ngq->queue, el_next); 2180 if (STAILQ_EMPTY(&ngq->queue)) 2181 atomic_clear_int(&ngq->q_flags, OP_PENDING); 2182 NG_QUEUE_UNLOCK(ngq); 2183 2184 /* If the item is supplying a callback, call it with an error */ 2185 if (item->apply != NULL) { 2186 if (item->depth == 1) 2187 item->apply->error = ENOENT; 2188 if (refcount_release(&item->apply->refs)) { 2189 (*item->apply->apply)(item->apply->context, 2190 item->apply->error); 2191 } 2192 } 2193 NG_FREE_ITEM(item); 2194 NG_QUEUE_LOCK(ngq); 2195 } 2196 NG_QUEUE_UNLOCK(ngq); 2197 } 2198 2199 /*********************************************************************** 2200 * Externally visible method for sending or queueing messages or data. 2201 ***********************************************************************/ 2202 2203 /* 2204 * The module code should have filled out the item correctly by this stage: 2205 * Common: 2206 * reference to destination node. 2207 * Reference to destination rcv hook if relevant. 2208 * apply pointer must be or NULL or reference valid struct ng_apply_info. 2209 * Data: 2210 * pointer to mbuf 2211 * Control_Message: 2212 * pointer to msg. 2213 * ID of original sender node. (return address) 2214 * Function: 2215 * Function pointer 2216 * void * argument 2217 * integer argument 2218 * 2219 * The nodes have several routines and macros to help with this task: 2220 */ 2221 2222 int 2223 ng_snd_item(item_p item, int flags) 2224 { 2225 hook_p hook; 2226 node_p node; 2227 int queue, rw; 2228 struct ng_queue *ngq; 2229 int error = 0; 2230 2231 /* We are sending item, so it must be present! */ 2232 KASSERT(item != NULL, ("ng_snd_item: item is NULL")); 2233 2234 #ifdef NETGRAPH_DEBUG 2235 _ngi_check(item, __FILE__, __LINE__); 2236 #endif 2237 2238 /* Item was sent once more, postpone apply() call. */ 2239 if (item->apply) 2240 refcount_acquire(&item->apply->refs); 2241 2242 node = NGI_NODE(item); 2243 /* Node is never optional. */ 2244 KASSERT(node != NULL, ("ng_snd_item: node is NULL")); 2245 2246 hook = NGI_HOOK(item); 2247 /* Valid hook and mbuf are mandatory for data. */ 2248 if ((item->el_flags & NGQF_TYPE) == NGQF_DATA) { 2249 KASSERT(hook != NULL, ("ng_snd_item: hook for data is NULL")); 2250 if (NGI_M(item) == NULL) 2251 ERROUT(EINVAL); 2252 CHECK_DATA_MBUF(NGI_M(item)); 2253 } 2254 2255 /* 2256 * If the item or the node specifies single threading, force 2257 * writer semantics. Similarly, the node may say one hook always 2258 * produces writers. These are overrides. 2259 */ 2260 if (((item->el_flags & NGQF_RW) == NGQF_WRITER) || 2261 (node->nd_flags & NGF_FORCE_WRITER) || 2262 (hook && (hook->hk_flags & HK_FORCE_WRITER))) { 2263 rw = NGQRW_W; 2264 } else { 2265 rw = NGQRW_R; 2266 } 2267 2268 /* 2269 * If sender or receiver requests queued delivery, or call graph 2270 * loops back from outbound to inbound path, or stack usage 2271 * level is dangerous - enqueue message. 2272 */ 2273 if ((flags & NG_QUEUE) || (hook && (hook->hk_flags & HK_QUEUE))) { 2274 queue = 1; 2275 } else if (hook && (hook->hk_flags & HK_TO_INBOUND) && 2276 curthread->td_ng_outbound) { 2277 queue = 1; 2278 } else { 2279 queue = 0; 2280 #ifdef GET_STACK_USAGE 2281 /* 2282 * Most of netgraph nodes have small stack consumption and 2283 * for them 25% of free stack space is more than enough. 2284 * Nodes/hooks with higher stack usage should be marked as 2285 * HI_STACK. For them 50% of stack will be guaranteed then. 2286 * XXX: Values 25% and 50% are completely empirical. 2287 */ 2288 size_t st, su, sl; 2289 GET_STACK_USAGE(st, su); 2290 sl = st - su; 2291 if ((sl * 4 < st) || ((sl * 2 < st) && 2292 ((node->nd_flags & NGF_HI_STACK) || (hook && 2293 (hook->hk_flags & HK_HI_STACK))))) 2294 queue = 1; 2295 #endif 2296 } 2297 2298 if (queue) { 2299 /* Put it on the queue for that node*/ 2300 ng_queue_rw(node, item, rw); 2301 return ((flags & NG_PROGRESS) ? EINPROGRESS : 0); 2302 } 2303 2304 /* 2305 * We already decided how we will be queueud or treated. 2306 * Try get the appropriate operating permission. 2307 */ 2308 if (rw == NGQRW_R) 2309 item = ng_acquire_read(node, item); 2310 else 2311 item = ng_acquire_write(node, item); 2312 2313 /* Item was queued while trying to get permission. */ 2314 if (item == NULL) 2315 return ((flags & NG_PROGRESS) ? EINPROGRESS : 0); 2316 2317 NGI_GET_NODE(item, node); /* zaps stored node */ 2318 2319 item->depth++; 2320 error = ng_apply_item(node, item, rw); /* drops r/w lock when done */ 2321 2322 /* If something is waiting on queue and ready, schedule it. */ 2323 ngq = &node->nd_input_queue; 2324 if (QUEUE_ACTIVE(ngq)) { 2325 NG_QUEUE_LOCK(ngq); 2326 if (QUEUE_ACTIVE(ngq) && NEXT_QUEUED_ITEM_CAN_PROCEED(ngq)) 2327 ng_worklist_add(node); 2328 NG_QUEUE_UNLOCK(ngq); 2329 } 2330 2331 /* 2332 * Node may go away as soon as we remove the reference. 2333 * Whatever we do, DO NOT access the node again! 2334 */ 2335 NG_NODE_UNREF(node); 2336 2337 return (error); 2338 2339 done: 2340 /* If was not sent, apply callback here. */ 2341 if (item->apply != NULL) { 2342 if (item->depth == 0 && error != 0) 2343 item->apply->error = error; 2344 if (refcount_release(&item->apply->refs)) { 2345 (*item->apply->apply)(item->apply->context, 2346 item->apply->error); 2347 } 2348 } 2349 2350 NG_FREE_ITEM(item); 2351 return (error); 2352 } 2353 2354 /* 2355 * We have an item that was possibly queued somewhere. 2356 * It should contain all the information needed 2357 * to run it on the appropriate node/hook. 2358 * If there is apply pointer and we own the last reference, call apply(). 2359 */ 2360 static int 2361 ng_apply_item(node_p node, item_p item, int rw) 2362 { 2363 hook_p hook; 2364 ng_rcvdata_t *rcvdata; 2365 ng_rcvmsg_t *rcvmsg; 2366 struct ng_apply_info *apply; 2367 int error = 0, depth; 2368 2369 /* Node and item are never optional. */ 2370 KASSERT(node != NULL, ("ng_apply_item: node is NULL")); 2371 KASSERT(item != NULL, ("ng_apply_item: item is NULL")); 2372 2373 NGI_GET_HOOK(item, hook); /* clears stored hook */ 2374 #ifdef NETGRAPH_DEBUG 2375 _ngi_check(item, __FILE__, __LINE__); 2376 #endif 2377 2378 apply = item->apply; 2379 depth = item->depth; 2380 2381 switch (item->el_flags & NGQF_TYPE) { 2382 case NGQF_DATA: 2383 /* 2384 * Check things are still ok as when we were queued. 2385 */ 2386 KASSERT(hook != NULL, ("ng_apply_item: hook for data is NULL")); 2387 if (NG_HOOK_NOT_VALID(hook) || 2388 NG_NODE_NOT_VALID(node)) { 2389 error = EIO; 2390 NG_FREE_ITEM(item); 2391 break; 2392 } 2393 /* 2394 * If no receive method, just silently drop it. 2395 * Give preference to the hook over-ride method. 2396 */ 2397 if ((!(rcvdata = hook->hk_rcvdata)) && 2398 (!(rcvdata = NG_HOOK_NODE(hook)->nd_type->rcvdata))) { 2399 error = 0; 2400 NG_FREE_ITEM(item); 2401 break; 2402 } 2403 error = (*rcvdata)(hook, item); 2404 break; 2405 case NGQF_MESG: 2406 if (hook && NG_HOOK_NOT_VALID(hook)) { 2407 /* 2408 * The hook has been zapped then we can't use it. 2409 * Immediately drop its reference. 2410 * The message may not need it. 2411 */ 2412 NG_HOOK_UNREF(hook); 2413 hook = NULL; 2414 } 2415 /* 2416 * Similarly, if the node is a zombie there is 2417 * nothing we can do with it, drop everything. 2418 */ 2419 if (NG_NODE_NOT_VALID(node)) { 2420 TRAP_ERROR(); 2421 error = EINVAL; 2422 NG_FREE_ITEM(item); 2423 break; 2424 } 2425 /* 2426 * Call the appropriate message handler for the object. 2427 * It is up to the message handler to free the message. 2428 * If it's a generic message, handle it generically, 2429 * otherwise call the type's message handler (if it exists). 2430 * XXX (race). Remember that a queued message may 2431 * reference a node or hook that has just been 2432 * invalidated. It will exist as the queue code 2433 * is holding a reference, but.. 2434 */ 2435 if ((NGI_MSG(item)->header.typecookie == NGM_GENERIC_COOKIE) && 2436 ((NGI_MSG(item)->header.flags & NGF_RESP) == 0)) { 2437 error = ng_generic_msg(node, item, hook); 2438 break; 2439 } 2440 if (((!hook) || (!(rcvmsg = hook->hk_rcvmsg))) && 2441 (!(rcvmsg = node->nd_type->rcvmsg))) { 2442 TRAP_ERROR(); 2443 error = 0; 2444 NG_FREE_ITEM(item); 2445 break; 2446 } 2447 error = (*rcvmsg)(node, item, hook); 2448 break; 2449 case NGQF_FN: 2450 case NGQF_FN2: 2451 /* 2452 * In the case of the shutdown message we allow it to hit 2453 * even if the node is invalid. 2454 */ 2455 if (NG_NODE_NOT_VALID(node) && 2456 NGI_FN(item) != &ng_rmnode) { 2457 TRAP_ERROR(); 2458 error = EINVAL; 2459 NG_FREE_ITEM(item); 2460 break; 2461 } 2462 /* Same is about some internal functions and invalid hook. */ 2463 if (hook && NG_HOOK_NOT_VALID(hook) && 2464 NGI_FN2(item) != &ng_con_part2 && 2465 NGI_FN2(item) != &ng_con_part3 && 2466 NGI_FN(item) != &ng_rmhook_part2) { 2467 TRAP_ERROR(); 2468 error = EINVAL; 2469 NG_FREE_ITEM(item); 2470 break; 2471 } 2472 2473 if ((item->el_flags & NGQF_TYPE) == NGQF_FN) { 2474 (*NGI_FN(item))(node, hook, NGI_ARG1(item), 2475 NGI_ARG2(item)); 2476 NG_FREE_ITEM(item); 2477 } else /* it is NGQF_FN2 */ 2478 error = (*NGI_FN2(item))(node, item, hook); 2479 break; 2480 } 2481 /* 2482 * We held references on some of the resources 2483 * that we took from the item. Now that we have 2484 * finished doing everything, drop those references. 2485 */ 2486 if (hook) 2487 NG_HOOK_UNREF(hook); 2488 2489 if (rw == NGQRW_R) 2490 ng_leave_read(node); 2491 else 2492 ng_leave_write(node); 2493 2494 /* Apply callback. */ 2495 if (apply != NULL) { 2496 if (depth == 1 && error != 0) 2497 apply->error = error; 2498 if (refcount_release(&apply->refs)) 2499 (*apply->apply)(apply->context, apply->error); 2500 } 2501 2502 return (error); 2503 } 2504 2505 /*********************************************************************** 2506 * Implement the 'generic' control messages 2507 ***********************************************************************/ 2508 static int 2509 ng_generic_msg(node_p here, item_p item, hook_p lasthook) 2510 { 2511 int error = 0; 2512 struct ng_mesg *msg; 2513 struct ng_mesg *resp = NULL; 2514 2515 NGI_GET_MSG(item, msg); 2516 if (msg->header.typecookie != NGM_GENERIC_COOKIE) { 2517 TRAP_ERROR(); 2518 error = EINVAL; 2519 goto out; 2520 } 2521 switch (msg->header.cmd) { 2522 case NGM_SHUTDOWN: 2523 ng_rmnode(here, NULL, NULL, 0); 2524 break; 2525 case NGM_MKPEER: 2526 { 2527 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data; 2528 2529 if (msg->header.arglen != sizeof(*mkp)) { 2530 TRAP_ERROR(); 2531 error = EINVAL; 2532 break; 2533 } 2534 mkp->type[sizeof(mkp->type) - 1] = '\0'; 2535 mkp->ourhook[sizeof(mkp->ourhook) - 1] = '\0'; 2536 mkp->peerhook[sizeof(mkp->peerhook) - 1] = '\0'; 2537 error = ng_mkpeer(here, mkp->ourhook, mkp->peerhook, mkp->type); 2538 break; 2539 } 2540 case NGM_CONNECT: 2541 { 2542 struct ngm_connect *const con = 2543 (struct ngm_connect *) msg->data; 2544 node_p node2; 2545 2546 if (msg->header.arglen != sizeof(*con)) { 2547 TRAP_ERROR(); 2548 error = EINVAL; 2549 break; 2550 } 2551 con->path[sizeof(con->path) - 1] = '\0'; 2552 con->ourhook[sizeof(con->ourhook) - 1] = '\0'; 2553 con->peerhook[sizeof(con->peerhook) - 1] = '\0'; 2554 /* Don't forget we get a reference.. */ 2555 error = ng_path2noderef(here, con->path, &node2, NULL); 2556 if (error) 2557 break; 2558 error = ng_con_nodes(item, here, con->ourhook, 2559 node2, con->peerhook); 2560 NG_NODE_UNREF(node2); 2561 break; 2562 } 2563 case NGM_NAME: 2564 { 2565 struct ngm_name *const nam = (struct ngm_name *) msg->data; 2566 2567 if (msg->header.arglen != sizeof(*nam)) { 2568 TRAP_ERROR(); 2569 error = EINVAL; 2570 break; 2571 } 2572 nam->name[sizeof(nam->name) - 1] = '\0'; 2573 error = ng_name_node(here, nam->name); 2574 break; 2575 } 2576 case NGM_RMHOOK: 2577 { 2578 struct ngm_rmhook *const rmh = (struct ngm_rmhook *) msg->data; 2579 hook_p hook; 2580 2581 if (msg->header.arglen != sizeof(*rmh)) { 2582 TRAP_ERROR(); 2583 error = EINVAL; 2584 break; 2585 } 2586 rmh->ourhook[sizeof(rmh->ourhook) - 1] = '\0'; 2587 if ((hook = ng_findhook(here, rmh->ourhook)) != NULL) 2588 ng_destroy_hook(hook); 2589 break; 2590 } 2591 case NGM_NODEINFO: 2592 { 2593 struct nodeinfo *ni; 2594 2595 NG_MKRESPONSE(resp, msg, sizeof(*ni), M_NOWAIT); 2596 if (resp == NULL) { 2597 error = ENOMEM; 2598 break; 2599 } 2600 2601 /* Fill in node info */ 2602 ni = (struct nodeinfo *) resp->data; 2603 if (NG_NODE_HAS_NAME(here)) 2604 strcpy(ni->name, NG_NODE_NAME(here)); 2605 strcpy(ni->type, here->nd_type->name); 2606 ni->id = ng_node2ID(here); 2607 ni->hooks = here->nd_numhooks; 2608 break; 2609 } 2610 case NGM_LISTHOOKS: 2611 { 2612 const int nhooks = here->nd_numhooks; 2613 struct hooklist *hl; 2614 struct nodeinfo *ni; 2615 hook_p hook; 2616 2617 /* Get response struct */ 2618 NG_MKRESPONSE(resp, msg, sizeof(*hl) + 2619 (nhooks * sizeof(struct linkinfo)), M_NOWAIT); 2620 if (resp == NULL) { 2621 error = ENOMEM; 2622 break; 2623 } 2624 hl = (struct hooklist *) resp->data; 2625 ni = &hl->nodeinfo; 2626 2627 /* Fill in node info */ 2628 if (NG_NODE_HAS_NAME(here)) 2629 strcpy(ni->name, NG_NODE_NAME(here)); 2630 strcpy(ni->type, here->nd_type->name); 2631 ni->id = ng_node2ID(here); 2632 2633 /* Cycle through the linked list of hooks */ 2634 ni->hooks = 0; 2635 LIST_FOREACH(hook, &here->nd_hooks, hk_hooks) { 2636 struct linkinfo *const link = &hl->link[ni->hooks]; 2637 2638 if (ni->hooks >= nhooks) { 2639 log(LOG_ERR, "%s: number of %s changed\n", 2640 __func__, "hooks"); 2641 break; 2642 } 2643 if (NG_HOOK_NOT_VALID(hook)) 2644 continue; 2645 strcpy(link->ourhook, NG_HOOK_NAME(hook)); 2646 strcpy(link->peerhook, NG_PEER_HOOK_NAME(hook)); 2647 if (NG_PEER_NODE_NAME(hook)[0] != '\0') 2648 strcpy(link->nodeinfo.name, 2649 NG_PEER_NODE_NAME(hook)); 2650 strcpy(link->nodeinfo.type, 2651 NG_PEER_NODE(hook)->nd_type->name); 2652 link->nodeinfo.id = ng_node2ID(NG_PEER_NODE(hook)); 2653 link->nodeinfo.hooks = NG_PEER_NODE(hook)->nd_numhooks; 2654 ni->hooks++; 2655 } 2656 break; 2657 } 2658 2659 case NGM_LISTNODES: 2660 { 2661 struct namelist *nl; 2662 node_p node; 2663 int i; 2664 2665 IDHASH_RLOCK(); 2666 /* Get response struct. */ 2667 NG_MKRESPONSE(resp, msg, sizeof(*nl) + 2668 (V_ng_nodes * sizeof(struct nodeinfo)), M_NOWAIT); 2669 if (resp == NULL) { 2670 IDHASH_RUNLOCK(); 2671 error = ENOMEM; 2672 break; 2673 } 2674 nl = (struct namelist *) resp->data; 2675 2676 /* Cycle through the lists of nodes. */ 2677 nl->numnames = 0; 2678 for (i = 0; i <= V_ng_ID_hmask; i++) { 2679 LIST_FOREACH(node, &V_ng_ID_hash[i], nd_idnodes) { 2680 struct nodeinfo *const np = 2681 &nl->nodeinfo[nl->numnames]; 2682 2683 if (NG_NODE_NOT_VALID(node)) 2684 continue; 2685 if (NG_NODE_HAS_NAME(node)) 2686 strcpy(np->name, NG_NODE_NAME(node)); 2687 strcpy(np->type, node->nd_type->name); 2688 np->id = ng_node2ID(node); 2689 np->hooks = node->nd_numhooks; 2690 KASSERT(nl->numnames < V_ng_nodes, 2691 ("%s: no space", __func__)); 2692 nl->numnames++; 2693 } 2694 } 2695 IDHASH_RUNLOCK(); 2696 break; 2697 } 2698 case NGM_LISTNAMES: 2699 { 2700 struct namelist *nl; 2701 node_p node; 2702 int i; 2703 2704 NAMEHASH_RLOCK(); 2705 /* Get response struct. */ 2706 NG_MKRESPONSE(resp, msg, sizeof(*nl) + 2707 (V_ng_named_nodes * sizeof(struct nodeinfo)), M_NOWAIT); 2708 if (resp == NULL) { 2709 NAMEHASH_RUNLOCK(); 2710 error = ENOMEM; 2711 break; 2712 } 2713 nl = (struct namelist *) resp->data; 2714 2715 /* Cycle through the lists of nodes. */ 2716 nl->numnames = 0; 2717 for (i = 0; i <= V_ng_name_hmask; i++) { 2718 LIST_FOREACH(node, &V_ng_name_hash[i], nd_nodes) { 2719 struct nodeinfo *const np = 2720 &nl->nodeinfo[nl->numnames]; 2721 2722 if (NG_NODE_NOT_VALID(node)) 2723 continue; 2724 strcpy(np->name, NG_NODE_NAME(node)); 2725 strcpy(np->type, node->nd_type->name); 2726 np->id = ng_node2ID(node); 2727 np->hooks = node->nd_numhooks; 2728 KASSERT(nl->numnames < V_ng_named_nodes, 2729 ("%s: no space", __func__)); 2730 nl->numnames++; 2731 } 2732 } 2733 NAMEHASH_RUNLOCK(); 2734 break; 2735 } 2736 2737 case NGM_LISTTYPES: 2738 { 2739 struct typelist *tl; 2740 struct ng_type *type; 2741 int num = 0; 2742 2743 TYPELIST_RLOCK(); 2744 /* Count number of types */ 2745 LIST_FOREACH(type, &ng_typelist, types) 2746 num++; 2747 2748 /* Get response struct */ 2749 NG_MKRESPONSE(resp, msg, sizeof(*tl) + 2750 (num * sizeof(struct typeinfo)), M_NOWAIT); 2751 if (resp == NULL) { 2752 TYPELIST_RUNLOCK(); 2753 error = ENOMEM; 2754 break; 2755 } 2756 tl = (struct typelist *) resp->data; 2757 2758 /* Cycle through the linked list of types */ 2759 tl->numtypes = 0; 2760 LIST_FOREACH(type, &ng_typelist, types) { 2761 struct typeinfo *const tp = &tl->typeinfo[tl->numtypes]; 2762 2763 strcpy(tp->type_name, type->name); 2764 tp->numnodes = type->refs - 1; /* don't count list */ 2765 KASSERT(tl->numtypes < num, ("%s: no space", __func__)); 2766 tl->numtypes++; 2767 } 2768 TYPELIST_RUNLOCK(); 2769 break; 2770 } 2771 2772 case NGM_BINARY2ASCII: 2773 { 2774 int bufSize = 20 * 1024; /* XXX hard coded constant */ 2775 const struct ng_parse_type *argstype; 2776 const struct ng_cmdlist *c; 2777 struct ng_mesg *binary, *ascii; 2778 2779 /* Data area must contain a valid netgraph message */ 2780 binary = (struct ng_mesg *)msg->data; 2781 if (msg->header.arglen < sizeof(struct ng_mesg) || 2782 (msg->header.arglen - sizeof(struct ng_mesg) < 2783 binary->header.arglen)) { 2784 TRAP_ERROR(); 2785 error = EINVAL; 2786 break; 2787 } 2788 2789 /* Get a response message with lots of room */ 2790 NG_MKRESPONSE(resp, msg, sizeof(*ascii) + bufSize, M_NOWAIT); 2791 if (resp == NULL) { 2792 error = ENOMEM; 2793 break; 2794 } 2795 ascii = (struct ng_mesg *)resp->data; 2796 2797 /* Copy binary message header to response message payload */ 2798 bcopy(binary, ascii, sizeof(*binary)); 2799 2800 /* Find command by matching typecookie and command number */ 2801 for (c = here->nd_type->cmdlist; c != NULL && c->name != NULL; 2802 c++) { 2803 if (binary->header.typecookie == c->cookie && 2804 binary->header.cmd == c->cmd) 2805 break; 2806 } 2807 if (c == NULL || c->name == NULL) { 2808 for (c = ng_generic_cmds; c->name != NULL; c++) { 2809 if (binary->header.typecookie == c->cookie && 2810 binary->header.cmd == c->cmd) 2811 break; 2812 } 2813 if (c->name == NULL) { 2814 NG_FREE_MSG(resp); 2815 error = ENOSYS; 2816 break; 2817 } 2818 } 2819 2820 /* Convert command name to ASCII */ 2821 snprintf(ascii->header.cmdstr, sizeof(ascii->header.cmdstr), 2822 "%s", c->name); 2823 2824 /* Convert command arguments to ASCII */ 2825 argstype = (binary->header.flags & NGF_RESP) ? 2826 c->respType : c->mesgType; 2827 if (argstype == NULL) { 2828 *ascii->data = '\0'; 2829 } else { 2830 if ((error = ng_unparse(argstype, 2831 (u_char *)binary->data, 2832 ascii->data, bufSize)) != 0) { 2833 NG_FREE_MSG(resp); 2834 break; 2835 } 2836 } 2837 2838 /* Return the result as struct ng_mesg plus ASCII string */ 2839 bufSize = strlen(ascii->data) + 1; 2840 ascii->header.arglen = bufSize; 2841 resp->header.arglen = sizeof(*ascii) + bufSize; 2842 break; 2843 } 2844 2845 case NGM_ASCII2BINARY: 2846 { 2847 int bufSize = 20 * 1024; /* XXX hard coded constant */ 2848 const struct ng_cmdlist *c; 2849 const struct ng_parse_type *argstype; 2850 struct ng_mesg *ascii, *binary; 2851 int off = 0; 2852 2853 /* Data area must contain at least a struct ng_mesg + '\0' */ 2854 ascii = (struct ng_mesg *)msg->data; 2855 if ((msg->header.arglen < sizeof(*ascii) + 1) || 2856 (ascii->header.arglen < 1) || 2857 (msg->header.arglen < sizeof(*ascii) + 2858 ascii->header.arglen)) { 2859 TRAP_ERROR(); 2860 error = EINVAL; 2861 break; 2862 } 2863 ascii->data[ascii->header.arglen - 1] = '\0'; 2864 2865 /* Get a response message with lots of room */ 2866 NG_MKRESPONSE(resp, msg, sizeof(*binary) + bufSize, M_NOWAIT); 2867 if (resp == NULL) { 2868 error = ENOMEM; 2869 break; 2870 } 2871 binary = (struct ng_mesg *)resp->data; 2872 2873 /* Copy ASCII message header to response message payload */ 2874 bcopy(ascii, binary, sizeof(*ascii)); 2875 2876 /* Find command by matching ASCII command string */ 2877 for (c = here->nd_type->cmdlist; 2878 c != NULL && c->name != NULL; c++) { 2879 if (strcmp(ascii->header.cmdstr, c->name) == 0) 2880 break; 2881 } 2882 if (c == NULL || c->name == NULL) { 2883 for (c = ng_generic_cmds; c->name != NULL; c++) { 2884 if (strcmp(ascii->header.cmdstr, c->name) == 0) 2885 break; 2886 } 2887 if (c->name == NULL) { 2888 NG_FREE_MSG(resp); 2889 error = ENOSYS; 2890 break; 2891 } 2892 } 2893 2894 /* Convert command name to binary */ 2895 binary->header.cmd = c->cmd; 2896 binary->header.typecookie = c->cookie; 2897 2898 /* Convert command arguments to binary */ 2899 argstype = (binary->header.flags & NGF_RESP) ? 2900 c->respType : c->mesgType; 2901 if (argstype == NULL) { 2902 bufSize = 0; 2903 } else { 2904 if ((error = ng_parse(argstype, ascii->data, &off, 2905 (u_char *)binary->data, &bufSize)) != 0) { 2906 NG_FREE_MSG(resp); 2907 break; 2908 } 2909 } 2910 2911 /* Return the result */ 2912 binary->header.arglen = bufSize; 2913 resp->header.arglen = sizeof(*binary) + bufSize; 2914 break; 2915 } 2916 2917 case NGM_TEXT_CONFIG: 2918 case NGM_TEXT_STATUS: 2919 /* 2920 * This one is tricky as it passes the command down to the 2921 * actual node, even though it is a generic type command. 2922 * This means we must assume that the item/msg is already freed 2923 * when control passes back to us. 2924 */ 2925 if (here->nd_type->rcvmsg != NULL) { 2926 NGI_MSG(item) = msg; /* put it back as we found it */ 2927 return((*here->nd_type->rcvmsg)(here, item, lasthook)); 2928 } 2929 /* Fall through if rcvmsg not supported */ 2930 default: 2931 TRAP_ERROR(); 2932 error = EINVAL; 2933 } 2934 /* 2935 * Sometimes a generic message may be statically allocated 2936 * to avoid problems with allocating when in tight memory situations. 2937 * Don't free it if it is so. 2938 * I break them apart here, because erros may cause a free if the item 2939 * in which case we'd be doing it twice. 2940 * they are kept together above, to simplify freeing. 2941 */ 2942 out: 2943 NG_RESPOND_MSG(error, here, item, resp); 2944 NG_FREE_MSG(msg); 2945 return (error); 2946 } 2947 2948 /************************************************************************ 2949 Queue element get/free routines 2950 ************************************************************************/ 2951 2952 uma_zone_t ng_qzone; 2953 uma_zone_t ng_qdzone; 2954 static int numthreads = 0; /* number of queue threads */ 2955 static int maxalloc = 4096;/* limit the damage of a leak */ 2956 static int maxdata = 4096; /* limit the damage of a DoS */ 2957 2958 SYSCTL_INT(_net_graph, OID_AUTO, threads, CTLFLAG_RDTUN, &numthreads, 2959 0, "Number of queue processing threads"); 2960 SYSCTL_INT(_net_graph, OID_AUTO, maxalloc, CTLFLAG_RDTUN, &maxalloc, 2961 0, "Maximum number of non-data queue items to allocate"); 2962 SYSCTL_INT(_net_graph, OID_AUTO, maxdata, CTLFLAG_RDTUN, &maxdata, 2963 0, "Maximum number of data queue items to allocate"); 2964 2965 #ifdef NETGRAPH_DEBUG 2966 static TAILQ_HEAD(, ng_item) ng_itemlist = TAILQ_HEAD_INITIALIZER(ng_itemlist); 2967 static int allocated; /* number of items malloc'd */ 2968 #endif 2969 2970 /* 2971 * Get a queue entry. 2972 * This is usually called when a packet first enters netgraph. 2973 * By definition, this is usually from an interrupt, or from a user. 2974 * Users are not so important, but try be quick for the times that it's 2975 * an interrupt. 2976 */ 2977 static __inline item_p 2978 ng_alloc_item(int type, int flags) 2979 { 2980 item_p item; 2981 2982 KASSERT(((type & ~NGQF_TYPE) == 0), 2983 ("%s: incorrect item type: %d", __func__, type)); 2984 2985 item = uma_zalloc((type == NGQF_DATA) ? ng_qdzone : ng_qzone, 2986 ((flags & NG_WAITOK) ? M_WAITOK : M_NOWAIT) | M_ZERO); 2987 2988 if (item) { 2989 item->el_flags = type; 2990 #ifdef NETGRAPH_DEBUG 2991 mtx_lock(&ngq_mtx); 2992 TAILQ_INSERT_TAIL(&ng_itemlist, item, all); 2993 allocated++; 2994 mtx_unlock(&ngq_mtx); 2995 #endif 2996 } 2997 2998 return (item); 2999 } 3000 3001 /* 3002 * Release a queue entry 3003 */ 3004 void 3005 ng_free_item(item_p item) 3006 { 3007 /* 3008 * The item may hold resources on its own. We need to free 3009 * these before we can free the item. What they are depends upon 3010 * what kind of item it is. it is important that nodes zero 3011 * out pointers to resources that they remove from the item 3012 * or we release them again here. 3013 */ 3014 switch (item->el_flags & NGQF_TYPE) { 3015 case NGQF_DATA: 3016 /* If we have an mbuf still attached.. */ 3017 NG_FREE_M(_NGI_M(item)); 3018 break; 3019 case NGQF_MESG: 3020 _NGI_RETADDR(item) = 0; 3021 NG_FREE_MSG(_NGI_MSG(item)); 3022 break; 3023 case NGQF_FN: 3024 case NGQF_FN2: 3025 /* nothing to free really, */ 3026 _NGI_FN(item) = NULL; 3027 _NGI_ARG1(item) = NULL; 3028 _NGI_ARG2(item) = 0; 3029 break; 3030 } 3031 /* If we still have a node or hook referenced... */ 3032 _NGI_CLR_NODE(item); 3033 _NGI_CLR_HOOK(item); 3034 3035 #ifdef NETGRAPH_DEBUG 3036 mtx_lock(&ngq_mtx); 3037 TAILQ_REMOVE(&ng_itemlist, item, all); 3038 allocated--; 3039 mtx_unlock(&ngq_mtx); 3040 #endif 3041 uma_zfree(((item->el_flags & NGQF_TYPE) == NGQF_DATA) ? 3042 ng_qdzone : ng_qzone, item); 3043 } 3044 3045 /* 3046 * Change type of the queue entry. 3047 * Possibly reallocates it from another UMA zone. 3048 */ 3049 static __inline item_p 3050 ng_realloc_item(item_p pitem, int type, int flags) 3051 { 3052 item_p item; 3053 int from, to; 3054 3055 KASSERT((pitem != NULL), ("%s: can't reallocate NULL", __func__)); 3056 KASSERT(((type & ~NGQF_TYPE) == 0), 3057 ("%s: incorrect item type: %d", __func__, type)); 3058 3059 from = ((pitem->el_flags & NGQF_TYPE) == NGQF_DATA); 3060 to = (type == NGQF_DATA); 3061 if (from != to) { 3062 /* If reallocation is required do it and copy item. */ 3063 if ((item = ng_alloc_item(type, flags)) == NULL) { 3064 ng_free_item(pitem); 3065 return (NULL); 3066 } 3067 *item = *pitem; 3068 ng_free_item(pitem); 3069 } else 3070 item = pitem; 3071 item->el_flags = (item->el_flags & ~NGQF_TYPE) | type; 3072 3073 return (item); 3074 } 3075 3076 /************************************************************************ 3077 Module routines 3078 ************************************************************************/ 3079 3080 /* 3081 * Handle the loading/unloading of a netgraph node type module 3082 */ 3083 int 3084 ng_mod_event(module_t mod, int event, void *data) 3085 { 3086 struct ng_type *const type = data; 3087 int error = 0; 3088 3089 switch (event) { 3090 case MOD_LOAD: 3091 3092 /* Register new netgraph node type */ 3093 if ((error = ng_newtype(type)) != 0) 3094 break; 3095 3096 /* Call type specific code */ 3097 if (type->mod_event != NULL) 3098 if ((error = (*type->mod_event)(mod, event, data))) { 3099 TYPELIST_WLOCK(); 3100 type->refs--; /* undo it */ 3101 LIST_REMOVE(type, types); 3102 TYPELIST_WUNLOCK(); 3103 } 3104 break; 3105 3106 case MOD_UNLOAD: 3107 if (type->refs > 1) { /* make sure no nodes exist! */ 3108 error = EBUSY; 3109 } else { 3110 if (type->refs == 0) /* failed load, nothing to undo */ 3111 break; 3112 if (type->mod_event != NULL) { /* check with type */ 3113 error = (*type->mod_event)(mod, event, data); 3114 if (error != 0) /* type refuses.. */ 3115 break; 3116 } 3117 TYPELIST_WLOCK(); 3118 LIST_REMOVE(type, types); 3119 TYPELIST_WUNLOCK(); 3120 } 3121 break; 3122 3123 default: 3124 if (type->mod_event != NULL) 3125 error = (*type->mod_event)(mod, event, data); 3126 else 3127 error = EOPNOTSUPP; /* XXX ? */ 3128 break; 3129 } 3130 return (error); 3131 } 3132 3133 static void 3134 vnet_netgraph_init(const void *unused __unused) 3135 { 3136 3137 /* We start with small hashes, but they can grow. */ 3138 V_ng_ID_hash = hashinit(16, M_NETGRAPH_NODE, &V_ng_ID_hmask); 3139 V_ng_name_hash = hashinit(16, M_NETGRAPH_NODE, &V_ng_name_hmask); 3140 } 3141 VNET_SYSINIT(vnet_netgraph_init, SI_SUB_NETGRAPH, SI_ORDER_FIRST, 3142 vnet_netgraph_init, NULL); 3143 3144 #ifdef VIMAGE 3145 static void 3146 vnet_netgraph_uninit(const void *unused __unused) 3147 { 3148 node_p node = NULL, last_killed = NULL; 3149 int i; 3150 3151 do { 3152 /* Find a node to kill */ 3153 IDHASH_RLOCK(); 3154 for (i = 0; i <= V_ng_ID_hmask; i++) { 3155 LIST_FOREACH(node, &V_ng_ID_hash[i], nd_idnodes) { 3156 if (node != &ng_deadnode) { 3157 NG_NODE_REF(node); 3158 break; 3159 } 3160 } 3161 if (node != NULL) 3162 break; 3163 } 3164 IDHASH_RUNLOCK(); 3165 3166 /* Attempt to kill it only if it is a regular node */ 3167 if (node != NULL) { 3168 if (node == last_killed) { 3169 if (node->nd_flags & NGF_REALLY_DIE) 3170 panic("ng node %s won't die", 3171 node->nd_name); 3172 /* The node persisted itself. Try again. */ 3173 node->nd_flags |= NGF_REALLY_DIE; 3174 } 3175 ng_rmnode(node, NULL, NULL, 0); 3176 NG_NODE_UNREF(node); 3177 last_killed = node; 3178 } 3179 } while (node != NULL); 3180 3181 hashdestroy(V_ng_name_hash, M_NETGRAPH_NODE, V_ng_name_hmask); 3182 hashdestroy(V_ng_ID_hash, M_NETGRAPH_NODE, V_ng_ID_hmask); 3183 } 3184 VNET_SYSUNINIT(vnet_netgraph_uninit, SI_SUB_NETGRAPH, SI_ORDER_FIRST, 3185 vnet_netgraph_uninit, NULL); 3186 #endif /* VIMAGE */ 3187 3188 /* 3189 * Handle loading and unloading for this code. 3190 * The only thing we need to link into is the NETISR strucure. 3191 */ 3192 static int 3193 ngb_mod_event(module_t mod, int event, void *data) 3194 { 3195 struct proc *p; 3196 struct thread *td; 3197 int i, error = 0; 3198 3199 switch (event) { 3200 case MOD_LOAD: 3201 /* Initialize everything. */ 3202 NG_WORKLIST_LOCK_INIT(); 3203 rw_init(&ng_typelist_lock, "netgraph types"); 3204 rw_init(&ng_idhash_lock, "netgraph idhash"); 3205 rw_init(&ng_namehash_lock, "netgraph namehash"); 3206 rw_init(&ng_topo_lock, "netgraph topology mutex"); 3207 #ifdef NETGRAPH_DEBUG 3208 mtx_init(&ng_nodelist_mtx, "netgraph nodelist mutex", NULL, 3209 MTX_DEF); 3210 mtx_init(&ngq_mtx, "netgraph item list mutex", NULL, 3211 MTX_DEF); 3212 #endif 3213 ng_qzone = uma_zcreate("NetGraph items", sizeof(struct ng_item), 3214 NULL, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0); 3215 uma_zone_set_max(ng_qzone, maxalloc); 3216 ng_qdzone = uma_zcreate("NetGraph data items", 3217 sizeof(struct ng_item), NULL, NULL, NULL, NULL, 3218 UMA_ALIGN_CACHE, 0); 3219 uma_zone_set_max(ng_qdzone, maxdata); 3220 /* Autoconfigure number of threads. */ 3221 if (numthreads <= 0) 3222 numthreads = mp_ncpus; 3223 /* Create threads. */ 3224 p = NULL; /* start with no process */ 3225 for (i = 0; i < numthreads; i++) { 3226 if (kproc_kthread_add(ngthread, NULL, &p, &td, 3227 RFHIGHPID, 0, "ng_queue", "ng_queue%d", i)) { 3228 numthreads = i; 3229 break; 3230 } 3231 } 3232 break; 3233 case MOD_UNLOAD: 3234 /* You can't unload it because an interface may be using it. */ 3235 error = EBUSY; 3236 break; 3237 default: 3238 error = EOPNOTSUPP; 3239 break; 3240 } 3241 return (error); 3242 } 3243 3244 static moduledata_t netgraph_mod = { 3245 "netgraph", 3246 ngb_mod_event, 3247 (NULL) 3248 }; 3249 DECLARE_MODULE(netgraph, netgraph_mod, SI_SUB_NETGRAPH, SI_ORDER_FIRST); 3250 SYSCTL_NODE(_net, OID_AUTO, graph, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 3251 "netgraph Family"); 3252 SYSCTL_INT(_net_graph, OID_AUTO, abi_version, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, NG_ABI_VERSION,""); 3253 SYSCTL_INT(_net_graph, OID_AUTO, msg_version, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, NG_VERSION, ""); 3254 3255 #ifdef NETGRAPH_DEBUG 3256 void 3257 dumphook (hook_p hook, char *file, int line) 3258 { 3259 printf("hook: name %s, %d refs, Last touched:\n", 3260 _NG_HOOK_NAME(hook), hook->hk_refs); 3261 printf(" Last active @ %s, line %d\n", 3262 hook->lastfile, hook->lastline); 3263 if (line) { 3264 printf(" problem discovered at file %s, line %d\n", file, line); 3265 #ifdef KDB 3266 kdb_backtrace(); 3267 #endif 3268 } 3269 } 3270 3271 void 3272 dumpnode(node_p node, char *file, int line) 3273 { 3274 printf("node: ID [%x]: type '%s', %d hooks, flags 0x%x, %d refs, %s:\n", 3275 _NG_NODE_ID(node), node->nd_type->name, 3276 node->nd_numhooks, node->nd_flags, 3277 node->nd_refs, node->nd_name); 3278 printf(" Last active @ %s, line %d\n", 3279 node->lastfile, node->lastline); 3280 if (line) { 3281 printf(" problem discovered at file %s, line %d\n", file, line); 3282 #ifdef KDB 3283 kdb_backtrace(); 3284 #endif 3285 } 3286 } 3287 3288 void 3289 dumpitem(item_p item, char *file, int line) 3290 { 3291 printf(" ACTIVE item, last used at %s, line %d", 3292 item->lastfile, item->lastline); 3293 switch(item->el_flags & NGQF_TYPE) { 3294 case NGQF_DATA: 3295 printf(" - [data]\n"); 3296 break; 3297 case NGQF_MESG: 3298 printf(" - retaddr[%d]:\n", _NGI_RETADDR(item)); 3299 break; 3300 case NGQF_FN: 3301 printf(" - fn@%p (%p, %p, %p, %d (%x))\n", 3302 _NGI_FN(item), 3303 _NGI_NODE(item), 3304 _NGI_HOOK(item), 3305 item->body.fn.fn_arg1, 3306 item->body.fn.fn_arg2, 3307 item->body.fn.fn_arg2); 3308 break; 3309 case NGQF_FN2: 3310 printf(" - fn2@%p (%p, %p, %p, %d (%x))\n", 3311 _NGI_FN2(item), 3312 _NGI_NODE(item), 3313 _NGI_HOOK(item), 3314 item->body.fn.fn_arg1, 3315 item->body.fn.fn_arg2, 3316 item->body.fn.fn_arg2); 3317 break; 3318 } 3319 if (line) { 3320 printf(" problem discovered at file %s, line %d\n", file, line); 3321 if (_NGI_NODE(item)) { 3322 printf("node %p ([%x])\n", 3323 _NGI_NODE(item), ng_node2ID(_NGI_NODE(item))); 3324 } 3325 } 3326 } 3327 3328 static void 3329 ng_dumpitems(void) 3330 { 3331 item_p item; 3332 int i = 1; 3333 TAILQ_FOREACH(item, &ng_itemlist, all) { 3334 printf("[%d] ", i++); 3335 dumpitem(item, NULL, 0); 3336 } 3337 } 3338 3339 static void 3340 ng_dumpnodes(void) 3341 { 3342 node_p node; 3343 int i = 1; 3344 mtx_lock(&ng_nodelist_mtx); 3345 SLIST_FOREACH(node, &ng_allnodes, nd_all) { 3346 printf("[%d] ", i++); 3347 dumpnode(node, NULL, 0); 3348 } 3349 mtx_unlock(&ng_nodelist_mtx); 3350 } 3351 3352 static void 3353 ng_dumphooks(void) 3354 { 3355 hook_p hook; 3356 int i = 1; 3357 mtx_lock(&ng_nodelist_mtx); 3358 SLIST_FOREACH(hook, &ng_allhooks, hk_all) { 3359 printf("[%d] ", i++); 3360 dumphook(hook, NULL, 0); 3361 } 3362 mtx_unlock(&ng_nodelist_mtx); 3363 } 3364 3365 static int 3366 sysctl_debug_ng_dump_items(SYSCTL_HANDLER_ARGS) 3367 { 3368 int error; 3369 int val; 3370 int i; 3371 3372 val = allocated; 3373 i = 1; 3374 error = sysctl_handle_int(oidp, &val, 0, req); 3375 if (error != 0 || req->newptr == NULL) 3376 return (error); 3377 if (val == 42) { 3378 ng_dumpitems(); 3379 ng_dumpnodes(); 3380 ng_dumphooks(); 3381 } 3382 return (0); 3383 } 3384 3385 SYSCTL_PROC(_debug, OID_AUTO, ng_dump_items, 3386 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, sizeof(int), 3387 sysctl_debug_ng_dump_items, "I", 3388 "Number of allocated items"); 3389 #endif /* NETGRAPH_DEBUG */ 3390 3391 /*********************************************************************** 3392 * Worklist routines 3393 **********************************************************************/ 3394 /* 3395 * Pick a node off the list of nodes with work, 3396 * try get an item to process off it. Remove the node from the list. 3397 */ 3398 static void 3399 ngthread(void *arg) 3400 { 3401 for (;;) { 3402 struct epoch_tracker et; 3403 node_p node; 3404 3405 /* Get node from the worklist. */ 3406 NG_WORKLIST_LOCK(); 3407 while ((node = STAILQ_FIRST(&ng_worklist)) == NULL) 3408 NG_WORKLIST_SLEEP(); 3409 STAILQ_REMOVE_HEAD(&ng_worklist, nd_input_queue.q_work); 3410 NG_WORKLIST_UNLOCK(); 3411 CURVNET_SET(node->nd_vnet); 3412 CTR3(KTR_NET, "%20s: node [%x] (%p) taken off worklist", 3413 __func__, node->nd_ID, node); 3414 /* 3415 * We have the node. We also take over the reference 3416 * that the list had on it. 3417 * Now process as much as you can, until it won't 3418 * let you have another item off the queue. 3419 * All this time, keep the reference 3420 * that lets us be sure that the node still exists. 3421 * Let the reference go at the last minute. 3422 */ 3423 NET_EPOCH_ENTER(et); 3424 for (;;) { 3425 item_p item; 3426 int rw; 3427 3428 NG_QUEUE_LOCK(&node->nd_input_queue); 3429 item = ng_dequeue(node, &rw); 3430 if (item == NULL) { 3431 node->nd_input_queue.q_flags2 &= ~NGQ2_WORKQ; 3432 NG_QUEUE_UNLOCK(&node->nd_input_queue); 3433 break; /* go look for another node */ 3434 } else { 3435 NG_QUEUE_UNLOCK(&node->nd_input_queue); 3436 NGI_GET_NODE(item, node); /* zaps stored node */ 3437 ng_apply_item(node, item, rw); 3438 NG_NODE_UNREF(node); 3439 } 3440 } 3441 NET_EPOCH_EXIT(et); 3442 NG_NODE_UNREF(node); 3443 CURVNET_RESTORE(); 3444 } 3445 } 3446 3447 /* 3448 * XXX 3449 * It's posible that a debugging NG_NODE_REF may need 3450 * to be outside the mutex zone 3451 */ 3452 static void 3453 ng_worklist_add(node_p node) 3454 { 3455 3456 mtx_assert(&node->nd_input_queue.q_mtx, MA_OWNED); 3457 3458 if ((node->nd_input_queue.q_flags2 & NGQ2_WORKQ) == 0) { 3459 /* 3460 * If we are not already on the work queue, 3461 * then put us on. 3462 */ 3463 node->nd_input_queue.q_flags2 |= NGQ2_WORKQ; 3464 NG_NODE_REF(node); /* XXX safe in mutex? */ 3465 NG_WORKLIST_LOCK(); 3466 STAILQ_INSERT_TAIL(&ng_worklist, node, nd_input_queue.q_work); 3467 NG_WORKLIST_UNLOCK(); 3468 CTR3(KTR_NET, "%20s: node [%x] (%p) put on worklist", __func__, 3469 node->nd_ID, node); 3470 NG_WORKLIST_WAKEUP(); 3471 } else { 3472 CTR3(KTR_NET, "%20s: node [%x] (%p) already on worklist", 3473 __func__, node->nd_ID, node); 3474 } 3475 } 3476 3477 /*********************************************************************** 3478 * Externally useable functions to set up a queue item ready for sending 3479 ***********************************************************************/ 3480 3481 #ifdef NETGRAPH_DEBUG 3482 #define ITEM_DEBUG_CHECKS \ 3483 do { \ 3484 if (NGI_NODE(item) ) { \ 3485 printf("item already has node"); \ 3486 kdb_enter(KDB_WHY_NETGRAPH, "has node"); \ 3487 NGI_CLR_NODE(item); \ 3488 } \ 3489 if (NGI_HOOK(item) ) { \ 3490 printf("item already has hook"); \ 3491 kdb_enter(KDB_WHY_NETGRAPH, "has hook"); \ 3492 NGI_CLR_HOOK(item); \ 3493 } \ 3494 } while (0) 3495 #else 3496 #define ITEM_DEBUG_CHECKS 3497 #endif 3498 3499 /* 3500 * Put mbuf into the item. 3501 * Hook and node references will be removed when the item is dequeued. 3502 * (or equivalent) 3503 * (XXX) Unsafe because no reference held by peer on remote node. 3504 * remote node might go away in this timescale. 3505 * We know the hooks can't go away because that would require getting 3506 * a writer item on both nodes and we must have at least a reader 3507 * here to be able to do this. 3508 * Note that the hook loaded is the REMOTE hook. 3509 * 3510 * This is possibly in the critical path for new data. 3511 */ 3512 item_p 3513 ng_package_data(struct mbuf *m, int flags) 3514 { 3515 item_p item; 3516 3517 if ((item = ng_alloc_item(NGQF_DATA, flags)) == NULL) { 3518 NG_FREE_M(m); 3519 return (NULL); 3520 } 3521 ITEM_DEBUG_CHECKS; 3522 item->el_flags |= NGQF_READER; 3523 NGI_M(item) = m; 3524 return (item); 3525 } 3526 3527 /* 3528 * Allocate a queue item and put items into it.. 3529 * Evaluate the address as this will be needed to queue it and 3530 * to work out what some of the fields should be. 3531 * Hook and node references will be removed when the item is dequeued. 3532 * (or equivalent) 3533 */ 3534 item_p 3535 ng_package_msg(struct ng_mesg *msg, int flags) 3536 { 3537 item_p item; 3538 3539 if ((item = ng_alloc_item(NGQF_MESG, flags)) == NULL) { 3540 NG_FREE_MSG(msg); 3541 return (NULL); 3542 } 3543 ITEM_DEBUG_CHECKS; 3544 /* Messages items count as writers unless explicitly exempted. */ 3545 if (msg->header.cmd & NGM_READONLY) 3546 item->el_flags |= NGQF_READER; 3547 else 3548 item->el_flags |= NGQF_WRITER; 3549 /* 3550 * Set the current lasthook into the queue item 3551 */ 3552 NGI_MSG(item) = msg; 3553 NGI_RETADDR(item) = 0; 3554 return (item); 3555 } 3556 3557 #define SET_RETADDR(item, here, retaddr) \ 3558 do { /* Data or fn items don't have retaddrs */ \ 3559 if ((item->el_flags & NGQF_TYPE) == NGQF_MESG) { \ 3560 if (retaddr) { \ 3561 NGI_RETADDR(item) = retaddr; \ 3562 } else { \ 3563 /* \ 3564 * The old return address should be ok. \ 3565 * If there isn't one, use the address \ 3566 * here. \ 3567 */ \ 3568 if (NGI_RETADDR(item) == 0) { \ 3569 NGI_RETADDR(item) \ 3570 = ng_node2ID(here); \ 3571 } \ 3572 } \ 3573 } \ 3574 } while (0) 3575 3576 int 3577 ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr) 3578 { 3579 hook_p peer; 3580 node_p peernode; 3581 ITEM_DEBUG_CHECKS; 3582 /* 3583 * Quick sanity check.. 3584 * Since a hook holds a reference on its node, once we know 3585 * that the peer is still connected (even if invalid,) we know 3586 * that the peer node is present, though maybe invalid. 3587 */ 3588 TOPOLOGY_RLOCK(); 3589 if ((hook == NULL) || NG_HOOK_NOT_VALID(hook) || 3590 NG_HOOK_NOT_VALID(peer = NG_HOOK_PEER(hook)) || 3591 NG_NODE_NOT_VALID(peernode = NG_PEER_NODE(hook))) { 3592 NG_FREE_ITEM(item); 3593 TRAP_ERROR(); 3594 TOPOLOGY_RUNLOCK(); 3595 return (ENETDOWN); 3596 } 3597 3598 /* 3599 * Transfer our interest to the other (peer) end. 3600 */ 3601 NG_HOOK_REF(peer); 3602 NG_NODE_REF(peernode); 3603 NGI_SET_HOOK(item, peer); 3604 NGI_SET_NODE(item, peernode); 3605 SET_RETADDR(item, here, retaddr); 3606 3607 TOPOLOGY_RUNLOCK(); 3608 3609 return (0); 3610 } 3611 3612 int 3613 ng_address_path(node_p here, item_p item, const char *address, ng_ID_t retaddr) 3614 { 3615 node_p dest = NULL; 3616 hook_p hook = NULL; 3617 int error; 3618 3619 ITEM_DEBUG_CHECKS; 3620 /* 3621 * Note that ng_path2noderef increments the reference count 3622 * on the node for us if it finds one. So we don't have to. 3623 */ 3624 error = ng_path2noderef(here, address, &dest, &hook); 3625 if (error) { 3626 NG_FREE_ITEM(item); 3627 return (error); 3628 } 3629 NGI_SET_NODE(item, dest); 3630 if (hook) 3631 NGI_SET_HOOK(item, hook); 3632 3633 SET_RETADDR(item, here, retaddr); 3634 return (0); 3635 } 3636 3637 int 3638 ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr) 3639 { 3640 node_p dest; 3641 3642 ITEM_DEBUG_CHECKS; 3643 /* 3644 * Find the target node. 3645 */ 3646 dest = ng_ID2noderef(ID); /* GETS REFERENCE! */ 3647 if (dest == NULL) { 3648 NG_FREE_ITEM(item); 3649 TRAP_ERROR(); 3650 return(EINVAL); 3651 } 3652 /* Fill out the contents */ 3653 NGI_SET_NODE(item, dest); 3654 NGI_CLR_HOOK(item); 3655 SET_RETADDR(item, here, retaddr); 3656 return (0); 3657 } 3658 3659 /* 3660 * special case to send a message to self (e.g. destroy node) 3661 * Possibly indicate an arrival hook too. 3662 * Useful for removing that hook :-) 3663 */ 3664 item_p 3665 ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg) 3666 { 3667 item_p item; 3668 3669 /* 3670 * Find the target node. 3671 * If there is a HOOK argument, then use that in preference 3672 * to the address. 3673 */ 3674 if ((item = ng_alloc_item(NGQF_MESG, NG_NOFLAGS)) == NULL) { 3675 NG_FREE_MSG(msg); 3676 return (NULL); 3677 } 3678 3679 /* Fill out the contents */ 3680 item->el_flags |= NGQF_WRITER; 3681 NG_NODE_REF(here); 3682 NGI_SET_NODE(item, here); 3683 if (hook) { 3684 NG_HOOK_REF(hook); 3685 NGI_SET_HOOK(item, hook); 3686 } 3687 NGI_MSG(item) = msg; 3688 NGI_RETADDR(item) = ng_node2ID(here); 3689 return (item); 3690 } 3691 3692 /* 3693 * Send ng_item_fn function call to the specified node. 3694 */ 3695 3696 int 3697 ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, void * arg1, int arg2) 3698 { 3699 3700 return ng_send_fn1(node, hook, fn, arg1, arg2, NG_NOFLAGS); 3701 } 3702 3703 int 3704 ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn, void * arg1, int arg2, 3705 int flags) 3706 { 3707 item_p item; 3708 3709 if ((item = ng_alloc_item(NGQF_FN, flags)) == NULL) { 3710 return (ENOMEM); 3711 } 3712 item->el_flags |= NGQF_WRITER; 3713 NG_NODE_REF(node); /* and one for the item */ 3714 NGI_SET_NODE(item, node); 3715 if (hook) { 3716 NG_HOOK_REF(hook); 3717 NGI_SET_HOOK(item, hook); 3718 } 3719 NGI_FN(item) = fn; 3720 NGI_ARG1(item) = arg1; 3721 NGI_ARG2(item) = arg2; 3722 return(ng_snd_item(item, flags)); 3723 } 3724 3725 /* 3726 * Send ng_item_fn2 function call to the specified node. 3727 * 3728 * If an optional pitem parameter is supplied, its apply 3729 * callback will be copied to the new item. If also NG_REUSE_ITEM 3730 * flag is set, no new item will be allocated, but pitem will 3731 * be used. 3732 */ 3733 int 3734 ng_send_fn2(node_p node, hook_p hook, item_p pitem, ng_item_fn2 *fn, void *arg1, 3735 int arg2, int flags) 3736 { 3737 item_p item; 3738 3739 KASSERT((pitem != NULL || (flags & NG_REUSE_ITEM) == 0), 3740 ("%s: NG_REUSE_ITEM but no pitem", __func__)); 3741 3742 /* 3743 * Allocate a new item if no supplied or 3744 * if we can't use supplied one. 3745 */ 3746 if (pitem == NULL || (flags & NG_REUSE_ITEM) == 0) { 3747 if ((item = ng_alloc_item(NGQF_FN2, flags)) == NULL) 3748 return (ENOMEM); 3749 if (pitem != NULL) 3750 item->apply = pitem->apply; 3751 } else { 3752 if ((item = ng_realloc_item(pitem, NGQF_FN2, flags)) == NULL) 3753 return (ENOMEM); 3754 } 3755 3756 item->el_flags = (item->el_flags & ~NGQF_RW) | NGQF_WRITER; 3757 NG_NODE_REF(node); /* and one for the item */ 3758 NGI_SET_NODE(item, node); 3759 if (hook) { 3760 NG_HOOK_REF(hook); 3761 NGI_SET_HOOK(item, hook); 3762 } 3763 NGI_FN2(item) = fn; 3764 NGI_ARG1(item) = arg1; 3765 NGI_ARG2(item) = arg2; 3766 return(ng_snd_item(item, flags)); 3767 } 3768 3769 /* 3770 * Official timeout routines for Netgraph nodes. 3771 */ 3772 static void 3773 ng_callout_trampoline(void *arg) 3774 { 3775 struct epoch_tracker et; 3776 item_p item = arg; 3777 3778 NET_EPOCH_ENTER(et); 3779 CURVNET_SET(NGI_NODE(item)->nd_vnet); 3780 ng_snd_item(item, 0); 3781 CURVNET_RESTORE(); 3782 NET_EPOCH_EXIT(et); 3783 } 3784 3785 int 3786 ng_callout(struct callout *c, node_p node, hook_p hook, int ticks, 3787 ng_item_fn *fn, void * arg1, int arg2) 3788 { 3789 item_p item, oitem; 3790 3791 if ((item = ng_alloc_item(NGQF_FN, NG_NOFLAGS)) == NULL) 3792 return (ENOMEM); 3793 3794 item->el_flags |= NGQF_WRITER; 3795 NG_NODE_REF(node); /* and one for the item */ 3796 NGI_SET_NODE(item, node); 3797 if (hook) { 3798 NG_HOOK_REF(hook); 3799 NGI_SET_HOOK(item, hook); 3800 } 3801 NGI_FN(item) = fn; 3802 NGI_ARG1(item) = arg1; 3803 NGI_ARG2(item) = arg2; 3804 oitem = c->c_arg; 3805 if (callout_reset(c, ticks, &ng_callout_trampoline, item) == 1 && 3806 oitem != NULL) 3807 NG_FREE_ITEM(oitem); 3808 return (0); 3809 } 3810 3811 /* A special modified version of callout_stop() */ 3812 int 3813 ng_uncallout(struct callout *c, node_p node) 3814 { 3815 item_p item; 3816 int rval; 3817 3818 KASSERT(c != NULL, ("ng_uncallout: NULL callout")); 3819 KASSERT(node != NULL, ("ng_uncallout: NULL node")); 3820 3821 rval = callout_stop(c); 3822 item = c->c_arg; 3823 /* Do an extra check */ 3824 if ((rval > 0) && (c->c_func == &ng_callout_trampoline) && 3825 (item != NULL) && (NGI_NODE(item) == node)) { 3826 /* 3827 * We successfully removed it from the queue before it ran 3828 * So now we need to unreference everything that was 3829 * given extra references. (NG_FREE_ITEM does this). 3830 */ 3831 NG_FREE_ITEM(item); 3832 } 3833 c->c_arg = NULL; 3834 3835 /* 3836 * Callers only want to know if the callout was cancelled and 3837 * not draining or stopped. 3838 */ 3839 return (rval > 0); 3840 } 3841 3842 /* 3843 * Set the address, if none given, give the node here. 3844 */ 3845 void 3846 ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr) 3847 { 3848 if (retaddr) { 3849 NGI_RETADDR(item) = retaddr; 3850 } else { 3851 /* 3852 * The old return address should be ok. 3853 * If there isn't one, use the address here. 3854 */ 3855 NGI_RETADDR(item) = ng_node2ID(here); 3856 } 3857 } 3858