ng_ether.c revision 139903
1 2/* 3 * ng_ether.c 4 */ 5 6/*- 7 * Copyright (c) 1996-2000 Whistle Communications, Inc. 8 * All rights reserved. 9 * 10 * Subject to the following obligations and disclaimer of warranty, use and 11 * redistribution of this software, in source or object code forms, with or 12 * without modifications are expressly permitted by Whistle Communications; 13 * provided, however, that: 14 * 1. Any and all reproductions of the source or object code must include the 15 * copyright notice above and the following disclaimer of warranties; and 16 * 2. No rights are granted, in any manner or form, to use Whistle 17 * Communications, Inc. trademarks, including the mark "WHISTLE 18 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 19 * such appears in the above copyright notice or in the software. 20 * 21 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 22 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 23 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 24 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 26 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 27 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 28 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 29 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 30 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 31 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 32 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 33 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 36 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 37 * OF SUCH DAMAGE. 38 * 39 * Authors: Archie Cobbs <archie@freebsd.org> 40 * Julian Elischer <julian@freebsd.org> 41 * 42 * $FreeBSD: head/sys/netgraph/ng_ether.c 139903 2005-01-08 12:42:03Z glebius $ 43 */ 44 45/* 46 * ng_ether(4) netgraph node type 47 */ 48 49#include <sys/param.h> 50#include <sys/systm.h> 51#include <sys/kernel.h> 52#include <sys/malloc.h> 53#include <sys/mbuf.h> 54#include <sys/errno.h> 55#include <sys/syslog.h> 56#include <sys/socket.h> 57 58#include <net/bridge.h> 59#include <net/if.h> 60#include <net/if_types.h> 61#include <net/if_arp.h> 62#include <net/if_var.h> 63#include <net/ethernet.h> 64 65#include <netgraph/ng_message.h> 66#include <netgraph/netgraph.h> 67#include <netgraph/ng_parse.h> 68#include <netgraph/ng_ether.h> 69 70#define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph) 71#define IFP2NG_SET(ifp, val) (((struct arpcom *)(ifp))->ac_netgraph = (val)) 72 73/* Per-node private data */ 74struct private { 75 struct ifnet *ifp; /* associated interface */ 76 hook_p upper; /* upper hook connection */ 77 hook_p lower; /* lower hook connection */ 78 hook_p orphan; /* orphan hook connection */ 79 u_char autoSrcAddr; /* always overwrite source address */ 80 u_char promisc; /* promiscuous mode enabled */ 81 u_long hwassist; /* hardware checksum capabilities */ 82 u_int flags; /* flags e.g. really die */ 83}; 84typedef struct private *priv_p; 85 86/* Hook pointers used by if_ethersubr.c to callback to netgraph */ 87extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 88extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 89extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 90extern void (*ng_ether_attach_p)(struct ifnet *ifp); 91extern void (*ng_ether_detach_p)(struct ifnet *ifp); 92extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 93 94/* Functional hooks called from if_ethersubr.c */ 95static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 96static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 97static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 98static void ng_ether_attach(struct ifnet *ifp); 99static void ng_ether_detach(struct ifnet *ifp); 100static void ng_ether_link_state(struct ifnet *ifp, int state); 101 102/* Other functions */ 103static int ng_ether_rcv_lower(node_p node, struct mbuf *m); 104static int ng_ether_rcv_upper(node_p node, struct mbuf *m); 105 106/* Netgraph node methods */ 107static ng_constructor_t ng_ether_constructor; 108static ng_rcvmsg_t ng_ether_rcvmsg; 109static ng_shutdown_t ng_ether_shutdown; 110static ng_newhook_t ng_ether_newhook; 111static ng_connect_t ng_ether_connect; 112static ng_rcvdata_t ng_ether_rcvdata; 113static ng_disconnect_t ng_ether_disconnect; 114static int ng_ether_mod_event(module_t mod, int event, void *data); 115 116/* List of commands and how to convert arguments to/from ASCII */ 117static const struct ng_cmdlist ng_ether_cmdlist[] = { 118 { 119 NGM_ETHER_COOKIE, 120 NGM_ETHER_GET_IFNAME, 121 "getifname", 122 NULL, 123 &ng_parse_string_type 124 }, 125 { 126 NGM_ETHER_COOKIE, 127 NGM_ETHER_GET_IFINDEX, 128 "getifindex", 129 NULL, 130 &ng_parse_int32_type 131 }, 132 { 133 NGM_ETHER_COOKIE, 134 NGM_ETHER_GET_ENADDR, 135 "getenaddr", 136 NULL, 137 &ng_parse_enaddr_type 138 }, 139 { 140 NGM_ETHER_COOKIE, 141 NGM_ETHER_SET_ENADDR, 142 "setenaddr", 143 &ng_parse_enaddr_type, 144 NULL 145 }, 146 { 147 NGM_ETHER_COOKIE, 148 NGM_ETHER_GET_PROMISC, 149 "getpromisc", 150 NULL, 151 &ng_parse_int32_type 152 }, 153 { 154 NGM_ETHER_COOKIE, 155 NGM_ETHER_SET_PROMISC, 156 "setpromisc", 157 &ng_parse_int32_type, 158 NULL 159 }, 160 { 161 NGM_ETHER_COOKIE, 162 NGM_ETHER_GET_AUTOSRC, 163 "getautosrc", 164 NULL, 165 &ng_parse_int32_type 166 }, 167 { 168 NGM_ETHER_COOKIE, 169 NGM_ETHER_SET_AUTOSRC, 170 "setautosrc", 171 &ng_parse_int32_type, 172 NULL 173 }, 174 { 0 } 175}; 176 177static struct ng_type ng_ether_typestruct = { 178 .version = NG_ABI_VERSION, 179 .name = NG_ETHER_NODE_TYPE, 180 .mod_event = ng_ether_mod_event, 181 .constructor = ng_ether_constructor, 182 .rcvmsg = ng_ether_rcvmsg, 183 .shutdown = ng_ether_shutdown, 184 .newhook = ng_ether_newhook, 185 .connect = ng_ether_connect, 186 .rcvdata = ng_ether_rcvdata, 187 .disconnect = ng_ether_disconnect, 188 .cmdlist = ng_ether_cmdlist, 189}; 190MODULE_VERSION(ng_ether, 1); 191NETGRAPH_INIT(ether, &ng_ether_typestruct); 192 193/****************************************************************** 194 ETHERNET FUNCTION HOOKS 195******************************************************************/ 196 197/* 198 * Handle a packet that has come in on an interface. We get to 199 * look at it here before any upper layer protocols do. 200 * 201 * NOTE: this function will get called at splimp() 202 */ 203static void 204ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 205{ 206 const node_p node = IFP2NG(ifp); 207 const priv_p priv = NG_NODE_PRIVATE(node); 208 int error; 209 210 /* If "lower" hook not connected, let packet continue */ 211 if (priv->lower == NULL) 212 return; 213 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 214} 215 216/* 217 * Handle a packet that has come in on an interface, and which 218 * does not match any of our known protocols (an ``orphan''). 219 * 220 * NOTE: this function will get called at splimp() 221 */ 222static void 223ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 224{ 225 const node_p node = IFP2NG(ifp); 226 const priv_p priv = NG_NODE_PRIVATE(node); 227 int error; 228 229 /* If "orphan" hook not connected, discard packet */ 230 if (priv->orphan == NULL) { 231 m_freem(m); 232 return; 233 } 234 NG_SEND_DATA_ONLY(error, priv->orphan, m); 235} 236 237/* 238 * Handle a packet that is going out on an interface. 239 * The Ethernet header is already attached to the mbuf. 240 */ 241static int 242ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 243{ 244 const node_p node = IFP2NG(ifp); 245 const priv_p priv = NG_NODE_PRIVATE(node); 246 int error = 0; 247 248 /* If "upper" hook not connected, let packet continue */ 249 if (priv->upper == NULL) 250 return (0); 251 252 /* Send it out "upper" hook */ 253 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 254 return (error); 255} 256 257/* 258 * A new Ethernet interface has been attached. 259 * Create a new node for it, etc. 260 */ 261static void 262ng_ether_attach(struct ifnet *ifp) 263{ 264 priv_p priv; 265 node_p node; 266 267 /* Create node */ 268 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 269 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 270 log(LOG_ERR, "%s: can't %s for %s\n", 271 __func__, "create node", ifp->if_xname); 272 return; 273 } 274 275 /* Allocate private data */ 276 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 277 if (priv == NULL) { 278 log(LOG_ERR, "%s: can't %s for %s\n", 279 __func__, "allocate memory", ifp->if_xname); 280 NG_NODE_UNREF(node); 281 return; 282 } 283 NG_NODE_SET_PRIVATE(node, priv); 284 priv->ifp = ifp; 285 IFP2NG_SET(ifp, node); 286 priv->autoSrcAddr = 1; 287 priv->hwassist = ifp->if_hwassist; 288 289 /* Try to give the node the same name as the interface */ 290 if (ng_name_node(node, ifp->if_xname) != 0) { 291 log(LOG_WARNING, "%s: can't name node %s\n", 292 __func__, ifp->if_xname); 293 } 294} 295 296/* 297 * An Ethernet interface is being detached. 298 * REALLY Destroy its node. 299 */ 300static void 301ng_ether_detach(struct ifnet *ifp) 302{ 303 const node_p node = IFP2NG(ifp); 304 const priv_p priv = NG_NODE_PRIVATE(node); 305 306 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 307 /* 308 * We can't assume the ifnet is still around when we run shutdown 309 * So zap it now. XXX We HOPE that anything running at this time 310 * handles it (as it should in the non netgraph case). 311 */ 312 IFP2NG_SET(ifp, NULL); 313 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 314 ng_rmnode_self(node); /* remove all netgraph parts */ 315} 316 317/* 318 * Notify graph about link event. 319 * if_link_state_change() has already checked that the state has changed. 320 */ 321static void 322ng_ether_link_state(struct ifnet *ifp, int state) 323{ 324 const node_p node = IFP2NG(ifp); 325 const priv_p priv = NG_NODE_PRIVATE(node); 326 struct ng_mesg *msg; 327 int cmd, dummy_error = 0; 328 329 if (priv->lower == NULL) 330 return; 331 332 if (state == LINK_STATE_UP) 333 cmd = NGM_LINK_IS_UP; 334 else if (state == LINK_STATE_DOWN) 335 cmd = NGM_LINK_IS_DOWN; 336 else 337 return; 338 339 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 340 if (msg != NULL) 341 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 342} 343 344/****************************************************************** 345 NETGRAPH NODE METHODS 346******************************************************************/ 347 348/* 349 * It is not possible or allowable to create a node of this type. 350 * Nodes get created when the interface is attached (or, when 351 * this node type's KLD is loaded). 352 */ 353static int 354ng_ether_constructor(node_p node) 355{ 356 return (EINVAL); 357} 358 359/* 360 * Check for attaching a new hook. 361 */ 362static int 363ng_ether_newhook(node_p node, hook_p hook, const char *name) 364{ 365 const priv_p priv = NG_NODE_PRIVATE(node); 366 hook_p *hookptr; 367 368 /* Divert hook is an alias for lower */ 369 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 370 name = NG_ETHER_HOOK_LOWER; 371 372 /* Which hook? */ 373 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 374 hookptr = &priv->upper; 375 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) 376 hookptr = &priv->lower; 377 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) 378 hookptr = &priv->orphan; 379 else 380 return (EINVAL); 381 382 /* Check if already connected (shouldn't be, but doesn't hurt) */ 383 if (*hookptr != NULL) 384 return (EISCONN); 385 386 /* Disable hardware checksums while 'upper' hook is connected */ 387 if (hookptr == &priv->upper) 388 priv->ifp->if_hwassist = 0; 389 390 /* OK */ 391 *hookptr = hook; 392 return (0); 393} 394 395/* 396 * Hooks are attached, adjust to force queueing. 397 * We don't really care which hook it is. 398 * they should all be queuing for outgoing data. 399 */ 400static int 401ng_ether_connect(hook_p hook) 402{ 403 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); 404 return (0); 405} 406 407/* 408 * Receive an incoming control message. 409 */ 410static int 411ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 412{ 413 const priv_p priv = NG_NODE_PRIVATE(node); 414 struct ng_mesg *resp = NULL; 415 int error = 0; 416 struct ng_mesg *msg; 417 418 NGI_GET_MSG(item, msg); 419 switch (msg->header.typecookie) { 420 case NGM_ETHER_COOKIE: 421 switch (msg->header.cmd) { 422 case NGM_ETHER_GET_IFNAME: 423 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT); 424 if (resp == NULL) { 425 error = ENOMEM; 426 break; 427 } 428 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1); 429 break; 430 case NGM_ETHER_GET_IFINDEX: 431 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 432 if (resp == NULL) { 433 error = ENOMEM; 434 break; 435 } 436 *((u_int32_t *)resp->data) = priv->ifp->if_index; 437 break; 438 case NGM_ETHER_GET_ENADDR: 439 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 440 if (resp == NULL) { 441 error = ENOMEM; 442 break; 443 } 444 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 445 resp->data, ETHER_ADDR_LEN); 446 break; 447 case NGM_ETHER_SET_ENADDR: 448 { 449 if (msg->header.arglen != ETHER_ADDR_LEN) { 450 error = EINVAL; 451 break; 452 } 453 error = if_setlladdr(priv->ifp, 454 (u_char *)msg->data, ETHER_ADDR_LEN); 455 break; 456 } 457 case NGM_ETHER_GET_PROMISC: 458 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 459 if (resp == NULL) { 460 error = ENOMEM; 461 break; 462 } 463 *((u_int32_t *)resp->data) = priv->promisc; 464 break; 465 case NGM_ETHER_SET_PROMISC: 466 { 467 u_char want; 468 469 if (msg->header.arglen != sizeof(u_int32_t)) { 470 error = EINVAL; 471 break; 472 } 473 want = !!*((u_int32_t *)msg->data); 474 if (want ^ priv->promisc) { 475 if ((error = ifpromisc(priv->ifp, want)) != 0) 476 break; 477 priv->promisc = want; 478 } 479 break; 480 } 481 case NGM_ETHER_GET_AUTOSRC: 482 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 483 if (resp == NULL) { 484 error = ENOMEM; 485 break; 486 } 487 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 488 break; 489 case NGM_ETHER_SET_AUTOSRC: 490 if (msg->header.arglen != sizeof(u_int32_t)) { 491 error = EINVAL; 492 break; 493 } 494 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 495 break; 496 default: 497 error = EINVAL; 498 break; 499 } 500 break; 501 default: 502 error = EINVAL; 503 break; 504 } 505 NG_RESPOND_MSG(error, node, item, resp); 506 NG_FREE_MSG(msg); 507 return (error); 508} 509 510/* 511 * Receive data on a hook. 512 */ 513static int 514ng_ether_rcvdata(hook_p hook, item_p item) 515{ 516 const node_p node = NG_HOOK_NODE(hook); 517 const priv_p priv = NG_NODE_PRIVATE(node); 518 struct mbuf *m; 519 520 NGI_GET_M(item, m); 521 NG_FREE_ITEM(item); 522 523 if (hook == priv->lower || hook == priv->orphan) 524 return ng_ether_rcv_lower(node, m); 525 if (hook == priv->upper) 526 return ng_ether_rcv_upper(node, m); 527 panic("%s: weird hook", __func__); 528#ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */ 529 return (0); 530#endif 531} 532 533/* 534 * Handle an mbuf received on the "lower" or "orphan" hook. 535 */ 536static int 537ng_ether_rcv_lower(node_p node, struct mbuf *m) 538{ 539 const priv_p priv = NG_NODE_PRIVATE(node); 540 struct ifnet *const ifp = priv->ifp; 541 542 /* Check whether interface is ready for packets */ 543 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 544 NG_FREE_M(m); 545 return (ENETDOWN); 546 } 547 548 /* Make sure header is fully pulled up */ 549 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 550 NG_FREE_M(m); 551 return (EINVAL); 552 } 553 if (m->m_len < sizeof(struct ether_header) 554 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 555 return (ENOBUFS); 556 557 /* Drop in the MAC address if desired */ 558 if (priv->autoSrcAddr) { 559 560 /* Make the mbuf writable if it's not already */ 561 if (!M_WRITABLE(m) 562 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 563 return (ENOBUFS); 564 565 /* Overwrite source MAC address */ 566 bcopy((IFP2AC(ifp))->ac_enaddr, 567 mtod(m, struct ether_header *)->ether_shost, 568 ETHER_ADDR_LEN); 569 } 570 571 /* Send it on its way */ 572 return ether_output_frame(ifp, m); 573} 574 575/* 576 * Handle an mbuf received on the "upper" hook. 577 */ 578static int 579ng_ether_rcv_upper(node_p node, struct mbuf *m) 580{ 581 const priv_p priv = NG_NODE_PRIVATE(node); 582 583 m->m_pkthdr.rcvif = priv->ifp; 584 585 if (BDG_ACTIVE(priv->ifp) ) 586 if ((m = bridge_in_ptr(priv->ifp, m)) == NULL) 587 return (0); 588 589 /* Route packet back in */ 590 ether_demux(priv->ifp, m); 591 return (0); 592} 593 594/* 595 * Shutdown node. This resets the node but does not remove it 596 * unless the REALLY_DIE flag is set. 597 */ 598static int 599ng_ether_shutdown(node_p node) 600{ 601 const priv_p priv = NG_NODE_PRIVATE(node); 602 603 if (node->nd_flags & NGF_REALLY_DIE) { 604 /* 605 * WE came here because the ethernet card is being unloaded, 606 * so stop being persistant. 607 * Actually undo all the things we did on creation. 608 * Assume the ifp has already been freed. 609 */ 610 NG_NODE_SET_PRIVATE(node, NULL); 611 FREE(priv, M_NETGRAPH); 612 NG_NODE_UNREF(node); /* free node itself */ 613 return (0); 614 } 615 if (priv->promisc) { /* disable promiscuous mode */ 616 (void)ifpromisc(priv->ifp, 0); 617 priv->promisc = 0; 618 } 619 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 620 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 621 622 return (0); 623} 624 625/* 626 * Hook disconnection. 627 */ 628static int 629ng_ether_disconnect(hook_p hook) 630{ 631 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 632 633 if (hook == priv->upper) { 634 priv->upper = NULL; 635 if (priv->ifp != NULL) /* restore h/w csum */ 636 priv->ifp->if_hwassist = priv->hwassist; 637 } else if (hook == priv->lower) 638 priv->lower = NULL; 639 else if (hook == priv->orphan) 640 priv->orphan = NULL; 641 else 642 panic("%s: weird hook", __func__); 643 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 644 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 645 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 646 return (0); 647} 648 649/****************************************************************** 650 INITIALIZATION 651******************************************************************/ 652 653/* 654 * Handle loading and unloading for this node type. 655 */ 656static int 657ng_ether_mod_event(module_t mod, int event, void *data) 658{ 659 struct ifnet *ifp; 660 int error = 0; 661 int s; 662 663 s = splnet(); 664 switch (event) { 665 case MOD_LOAD: 666 667 /* Register function hooks */ 668 if (ng_ether_attach_p != NULL) { 669 error = EEXIST; 670 break; 671 } 672 ng_ether_attach_p = ng_ether_attach; 673 ng_ether_detach_p = ng_ether_detach; 674 ng_ether_output_p = ng_ether_output; 675 ng_ether_input_p = ng_ether_input; 676 ng_ether_input_orphan_p = ng_ether_input_orphan; 677 ng_ether_link_state_p = ng_ether_link_state; 678 679 /* Create nodes for any already-existing Ethernet interfaces */ 680 IFNET_RLOCK(); 681 TAILQ_FOREACH(ifp, &ifnet, if_link) { 682 if (ifp->if_type == IFT_ETHER 683 || ifp->if_type == IFT_L2VLAN) 684 ng_ether_attach(ifp); 685 } 686 IFNET_RUNLOCK(); 687 break; 688 689 case MOD_UNLOAD: 690 691 /* 692 * Note that the base code won't try to unload us until 693 * all nodes have been removed, and that can't happen 694 * until all Ethernet interfaces are removed. In any 695 * case, we know there are no nodes left if the action 696 * is MOD_UNLOAD, so there's no need to detach any nodes. 697 */ 698 699 /* Unregister function hooks */ 700 ng_ether_attach_p = NULL; 701 ng_ether_detach_p = NULL; 702 ng_ether_output_p = NULL; 703 ng_ether_input_p = NULL; 704 ng_ether_input_orphan_p = NULL; 705 ng_ether_link_state_p = NULL; 706 break; 707 708 default: 709 error = EOPNOTSUPP; 710 break; 711 } 712 splx(s); 713 return (error); 714} 715 716