Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netgraph/ng_ether.c
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1 2 /* 3 * ng_ether.c 4 * 5 * Copyright (c) 1996-2000 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Authors: Archie Cobbs <archie@freebsd.org> 38 * Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD: releng/5.3/sys/netgraph/ng_ether.c 136588 2004-10-16 08:43:07Z cvs2svn $ 41 */ 42 43 /* 44 * ng_ether(4) netgraph node type 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/errno.h> 53 #include <sys/syslog.h> 54 #include <sys/socket.h> 55 56 #include <net/if.h> 57 #include <net/if_types.h> 58 #include <net/if_arp.h> 59 #include <net/if_var.h> 60 #include <net/ethernet.h> 61 62 #include <netgraph/ng_message.h> 63 #include <netgraph/netgraph.h> 64 #include <netgraph/ng_parse.h> 65 #include <netgraph/ng_ether.h> 66 67 #define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph) 68 #define IFP2NG_SET(ifp, val) (((struct arpcom *)(ifp))->ac_netgraph = (val)) 69 70 /* Per-node private data */ 71 struct private { 72 struct ifnet *ifp; /* associated interface */ 73 hook_p upper; /* upper hook connection */ 74 hook_p lower; /* lower hook connection */ 75 hook_p orphan; /* orphan hook connection */ 76 u_char autoSrcAddr; /* always overwrite source address */ 77 u_char promisc; /* promiscuous mode enabled */ 78 u_long hwassist; /* hardware checksum capabilities */ 79 u_int flags; /* flags e.g. really die */ 80 }; 81 typedef struct private *priv_p; 82 83 /* Hook pointers used by if_ethersubr.c to callback to netgraph */ 84 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 85 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 86 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 87 extern void (*ng_ether_attach_p)(struct ifnet *ifp); 88 extern void (*ng_ether_detach_p)(struct ifnet *ifp); 89 90 /* Functional hooks called from if_ethersubr.c */ 91 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 92 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 93 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 94 static void ng_ether_attach(struct ifnet *ifp); 95 static void ng_ether_detach(struct ifnet *ifp); 96 97 /* Other functions */ 98 static int ng_ether_rcv_lower(node_p node, struct mbuf *m); 99 static int ng_ether_rcv_upper(node_p node, struct mbuf *m); 100 101 /* Netgraph node methods */ 102 static ng_constructor_t ng_ether_constructor; 103 static ng_rcvmsg_t ng_ether_rcvmsg; 104 static ng_shutdown_t ng_ether_shutdown; 105 static ng_newhook_t ng_ether_newhook; 106 static ng_connect_t ng_ether_connect; 107 static ng_rcvdata_t ng_ether_rcvdata; 108 static ng_disconnect_t ng_ether_disconnect; 109 static int ng_ether_mod_event(module_t mod, int event, void *data); 110 111 /* List of commands and how to convert arguments to/from ASCII */ 112 static const struct ng_cmdlist ng_ether_cmdlist[] = { 113 { 114 NGM_ETHER_COOKIE, 115 NGM_ETHER_GET_IFNAME, 116 "getifname", 117 NULL, 118 &ng_parse_string_type 119 }, 120 { 121 NGM_ETHER_COOKIE, 122 NGM_ETHER_GET_IFINDEX, 123 "getifindex", 124 NULL, 125 &ng_parse_int32_type 126 }, 127 { 128 NGM_ETHER_COOKIE, 129 NGM_ETHER_GET_ENADDR, 130 "getenaddr", 131 NULL, 132 &ng_parse_enaddr_type 133 }, 134 { 135 NGM_ETHER_COOKIE, 136 NGM_ETHER_SET_ENADDR, 137 "setenaddr", 138 &ng_parse_enaddr_type, 139 NULL 140 }, 141 { 142 NGM_ETHER_COOKIE, 143 NGM_ETHER_GET_PROMISC, 144 "getpromisc", 145 NULL, 146 &ng_parse_int32_type 147 }, 148 { 149 NGM_ETHER_COOKIE, 150 NGM_ETHER_SET_PROMISC, 151 "setpromisc", 152 &ng_parse_int32_type, 153 NULL 154 }, 155 { 156 NGM_ETHER_COOKIE, 157 NGM_ETHER_GET_AUTOSRC, 158 "getautosrc", 159 NULL, 160 &ng_parse_int32_type 161 }, 162 { 163 NGM_ETHER_COOKIE, 164 NGM_ETHER_SET_AUTOSRC, 165 "setautosrc", 166 &ng_parse_int32_type, 167 NULL 168 }, 169 { 0 } 170 }; 171 172 static struct ng_type ng_ether_typestruct = { 173 .version = NG_ABI_VERSION, 174 .name = NG_ETHER_NODE_TYPE, 175 .mod_event = ng_ether_mod_event, 176 .constructor = ng_ether_constructor, 177 .rcvmsg = ng_ether_rcvmsg, 178 .shutdown = ng_ether_shutdown, 179 .newhook = ng_ether_newhook, 180 .connect = ng_ether_connect, 181 .rcvdata = ng_ether_rcvdata, 182 .disconnect = ng_ether_disconnect, 183 .cmdlist = ng_ether_cmdlist, 184 }; 185 MODULE_VERSION(ng_ether, 1); 186 NETGRAPH_INIT(ether, &ng_ether_typestruct); 187 188 /****************************************************************** 189 ETHERNET FUNCTION HOOKS 190 ******************************************************************/ 191 192 /* 193 * Handle a packet that has come in on an interface. We get to 194 * look at it here before any upper layer protocols do. 195 * 196 * NOTE: this function will get called at splimp() 197 */ 198 static void 199 ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 200 { 201 const node_p node = IFP2NG(ifp); 202 const priv_p priv = NG_NODE_PRIVATE(node); 203 int error; 204 205 /* If "lower" hook not connected, let packet continue */ 206 if (priv->lower == NULL) 207 return; 208 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 209 } 210 211 /* 212 * Handle a packet that has come in on an interface, and which 213 * does not match any of our known protocols (an ``orphan''). 214 * 215 * NOTE: this function will get called at splimp() 216 */ 217 static void 218 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 219 { 220 const node_p node = IFP2NG(ifp); 221 const priv_p priv = NG_NODE_PRIVATE(node); 222 int error; 223 224 /* If "orphan" hook not connected, discard packet */ 225 if (priv->orphan == NULL) { 226 m_freem(m); 227 return; 228 } 229 NG_SEND_DATA_ONLY(error, priv->orphan, m); 230 } 231 232 /* 233 * Handle a packet that is going out on an interface. 234 * The Ethernet header is already attached to the mbuf. 235 */ 236 static int 237 ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 238 { 239 const node_p node = IFP2NG(ifp); 240 const priv_p priv = NG_NODE_PRIVATE(node); 241 int error = 0; 242 243 /* If "upper" hook not connected, let packet continue */ 244 if (priv->upper == NULL) 245 return (0); 246 247 /* Send it out "upper" hook */ 248 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 249 return (error); 250 } 251 252 /* 253 * A new Ethernet interface has been attached. 254 * Create a new node for it, etc. 255 */ 256 static void 257 ng_ether_attach(struct ifnet *ifp) 258 { 259 priv_p priv; 260 node_p node; 261 262 /* Create node */ 263 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 264 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 265 log(LOG_ERR, "%s: can't %s for %s\n", 266 __func__, "create node", ifp->if_xname); 267 return; 268 } 269 270 /* Allocate private data */ 271 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 272 if (priv == NULL) { 273 log(LOG_ERR, "%s: can't %s for %s\n", 274 __func__, "allocate memory", ifp->if_xname); 275 NG_NODE_UNREF(node); 276 return; 277 } 278 NG_NODE_SET_PRIVATE(node, priv); 279 priv->ifp = ifp; 280 IFP2NG_SET(ifp, node); 281 priv->autoSrcAddr = 1; 282 priv->hwassist = ifp->if_hwassist; 283 284 /* Try to give the node the same name as the interface */ 285 if (ng_name_node(node, ifp->if_xname) != 0) { 286 log(LOG_WARNING, "%s: can't name node %s\n", 287 __func__, ifp->if_xname); 288 } 289 } 290 291 /* 292 * An Ethernet interface is being detached. 293 * REALLY Destroy its node. 294 */ 295 static void 296 ng_ether_detach(struct ifnet *ifp) 297 { 298 const node_p node = IFP2NG(ifp); 299 const priv_p priv = NG_NODE_PRIVATE(node); 300 301 if (node == NULL) /* no node (why not?), ignore */ 302 return; 303 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 304 /* 305 * We can't assume the ifnet is still around when we run shutdown 306 * So zap it now. XXX We HOPE that anything running at this time 307 * handles it (as it should in the non netgraph case). 308 */ 309 IFP2NG_SET(ifp, NULL); 310 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 311 ng_rmnode_self(node); /* remove all netgraph parts */ 312 } 313 314 /****************************************************************** 315 NETGRAPH NODE METHODS 316 ******************************************************************/ 317 318 /* 319 * It is not possible or allowable to create a node of this type. 320 * Nodes get created when the interface is attached (or, when 321 * this node type's KLD is loaded). 322 */ 323 static int 324 ng_ether_constructor(node_p node) 325 { 326 return (EINVAL); 327 } 328 329 /* 330 * Check for attaching a new hook. 331 */ 332 static int 333 ng_ether_newhook(node_p node, hook_p hook, const char *name) 334 { 335 const priv_p priv = NG_NODE_PRIVATE(node); 336 hook_p *hookptr; 337 338 /* Divert hook is an alias for lower */ 339 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 340 name = NG_ETHER_HOOK_LOWER; 341 342 /* Which hook? */ 343 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 344 hookptr = &priv->upper; 345 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) 346 hookptr = &priv->lower; 347 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) 348 hookptr = &priv->orphan; 349 else 350 return (EINVAL); 351 352 /* Check if already connected (shouldn't be, but doesn't hurt) */ 353 if (*hookptr != NULL) 354 return (EISCONN); 355 356 /* Disable hardware checksums while 'upper' hook is connected */ 357 if (hookptr == &priv->upper) 358 priv->ifp->if_hwassist = 0; 359 360 /* OK */ 361 *hookptr = hook; 362 return (0); 363 } 364 365 /* 366 * Hooks are attached, adjust to force queueing. 367 * We don't really care which hook it is. 368 * they should all be queuing for outgoing data. 369 */ 370 static int 371 ng_ether_connect(hook_p hook) 372 { 373 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); 374 return (0); 375 } 376 377 /* 378 * Receive an incoming control message. 379 */ 380 static int 381 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 382 { 383 const priv_p priv = NG_NODE_PRIVATE(node); 384 struct ng_mesg *resp = NULL; 385 int error = 0; 386 struct ng_mesg *msg; 387 388 NGI_GET_MSG(item, msg); 389 switch (msg->header.typecookie) { 390 case NGM_ETHER_COOKIE: 391 switch (msg->header.cmd) { 392 case NGM_ETHER_GET_IFNAME: 393 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT); 394 if (resp == NULL) { 395 error = ENOMEM; 396 break; 397 } 398 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1); 399 break; 400 case NGM_ETHER_GET_IFINDEX: 401 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 402 if (resp == NULL) { 403 error = ENOMEM; 404 break; 405 } 406 *((u_int32_t *)resp->data) = priv->ifp->if_index; 407 break; 408 case NGM_ETHER_GET_ENADDR: 409 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 410 if (resp == NULL) { 411 error = ENOMEM; 412 break; 413 } 414 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 415 resp->data, ETHER_ADDR_LEN); 416 break; 417 case NGM_ETHER_SET_ENADDR: 418 { 419 if (msg->header.arglen != ETHER_ADDR_LEN) { 420 error = EINVAL; 421 break; 422 } 423 error = if_setlladdr(priv->ifp, 424 (u_char *)msg->data, ETHER_ADDR_LEN); 425 break; 426 } 427 case NGM_ETHER_GET_PROMISC: 428 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 429 if (resp == NULL) { 430 error = ENOMEM; 431 break; 432 } 433 *((u_int32_t *)resp->data) = priv->promisc; 434 break; 435 case NGM_ETHER_SET_PROMISC: 436 { 437 u_char want; 438 439 if (msg->header.arglen != sizeof(u_int32_t)) { 440 error = EINVAL; 441 break; 442 } 443 want = !!*((u_int32_t *)msg->data); 444 if (want ^ priv->promisc) { 445 if ((error = ifpromisc(priv->ifp, want)) != 0) 446 break; 447 priv->promisc = want; 448 } 449 break; 450 } 451 case NGM_ETHER_GET_AUTOSRC: 452 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 453 if (resp == NULL) { 454 error = ENOMEM; 455 break; 456 } 457 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 458 break; 459 case NGM_ETHER_SET_AUTOSRC: 460 if (msg->header.arglen != sizeof(u_int32_t)) { 461 error = EINVAL; 462 break; 463 } 464 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 465 break; 466 default: 467 error = EINVAL; 468 break; 469 } 470 break; 471 default: 472 error = EINVAL; 473 break; 474 } 475 NG_RESPOND_MSG(error, node, item, resp); 476 NG_FREE_MSG(msg); 477 return (error); 478 } 479 480 /* 481 * Receive data on a hook. 482 */ 483 static int 484 ng_ether_rcvdata(hook_p hook, item_p item) 485 { 486 const node_p node = NG_HOOK_NODE(hook); 487 const priv_p priv = NG_NODE_PRIVATE(node); 488 struct mbuf *m; 489 490 NGI_GET_M(item, m); 491 NG_FREE_ITEM(item); 492 493 if (hook == priv->lower || hook == priv->orphan) 494 return ng_ether_rcv_lower(node, m); 495 if (hook == priv->upper) 496 return ng_ether_rcv_upper(node, m); 497 panic("%s: weird hook", __func__); 498 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */ 499 return NULL; 500 #endif 501 } 502 503 /* 504 * Handle an mbuf received on the "lower" or "orphan" hook. 505 */ 506 static int 507 ng_ether_rcv_lower(node_p node, struct mbuf *m) 508 { 509 const priv_p priv = NG_NODE_PRIVATE(node); 510 struct ifnet *const ifp = priv->ifp; 511 512 /* Check whether interface is ready for packets */ 513 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 514 NG_FREE_M(m); 515 return (ENETDOWN); 516 } 517 518 /* Make sure header is fully pulled up */ 519 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 520 NG_FREE_M(m); 521 return (EINVAL); 522 } 523 if (m->m_len < sizeof(struct ether_header) 524 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 525 return (ENOBUFS); 526 527 /* Drop in the MAC address if desired */ 528 if (priv->autoSrcAddr) { 529 530 /* Make the mbuf writable if it's not already */ 531 if (!M_WRITABLE(m) 532 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 533 return (ENOBUFS); 534 535 /* Overwrite source MAC address */ 536 bcopy((IFP2AC(ifp))->ac_enaddr, 537 mtod(m, struct ether_header *)->ether_shost, 538 ETHER_ADDR_LEN); 539 } 540 541 /* Send it on its way */ 542 return ether_output_frame(ifp, m); 543 } 544 545 /* 546 * Handle an mbuf received on the "upper" hook. 547 */ 548 static int 549 ng_ether_rcv_upper(node_p node, struct mbuf *m) 550 { 551 const priv_p priv = NG_NODE_PRIVATE(node); 552 553 m->m_pkthdr.rcvif = priv->ifp; 554 555 /* Route packet back in */ 556 ether_demux(priv->ifp, m); 557 return (0); 558 } 559 560 /* 561 * Shutdown node. This resets the node but does not remove it 562 * unless the REALLY_DIE flag is set. 563 */ 564 static int 565 ng_ether_shutdown(node_p node) 566 { 567 const priv_p priv = NG_NODE_PRIVATE(node); 568 569 if (node->nd_flags & NGF_REALLY_DIE) { 570 /* 571 * WE came here because the ethernet card is being unloaded, 572 * so stop being persistant. 573 * Actually undo all the things we did on creation. 574 * Assume the ifp has already been freed. 575 */ 576 NG_NODE_SET_PRIVATE(node, NULL); 577 FREE(priv, M_NETGRAPH); 578 NG_NODE_UNREF(node); /* free node itself */ 579 return (0); 580 } 581 if (priv->promisc) { /* disable promiscuous mode */ 582 (void)ifpromisc(priv->ifp, 0); 583 priv->promisc = 0; 584 } 585 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 586 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 587 588 return (0); 589 } 590 591 /* 592 * Hook disconnection. 593 */ 594 static int 595 ng_ether_disconnect(hook_p hook) 596 { 597 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 598 599 if (hook == priv->upper) { 600 priv->upper = NULL; 601 if (priv->ifp != NULL) /* restore h/w csum */ 602 priv->ifp->if_hwassist = priv->hwassist; 603 } else if (hook == priv->lower) 604 priv->lower = NULL; 605 else if (hook == priv->orphan) 606 priv->orphan = NULL; 607 else 608 panic("%s: weird hook", __func__); 609 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 610 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 611 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 612 return (0); 613 } 614 615 /****************************************************************** 616 INITIALIZATION 617 ******************************************************************/ 618 619 /* 620 * Handle loading and unloading for this node type. 621 */ 622 static int 623 ng_ether_mod_event(module_t mod, int event, void *data) 624 { 625 struct ifnet *ifp; 626 int error = 0; 627 int s; 628 629 s = splnet(); 630 switch (event) { 631 case MOD_LOAD: 632 633 /* Register function hooks */ 634 if (ng_ether_attach_p != NULL) { 635 error = EEXIST; 636 break; 637 } 638 ng_ether_attach_p = ng_ether_attach; 639 ng_ether_detach_p = ng_ether_detach; 640 ng_ether_output_p = ng_ether_output; 641 ng_ether_input_p = ng_ether_input; 642 ng_ether_input_orphan_p = ng_ether_input_orphan; 643 644 /* Create nodes for any already-existing Ethernet interfaces */ 645 IFNET_RLOCK(); 646 TAILQ_FOREACH(ifp, &ifnet, if_link) { 647 if (ifp->if_type == IFT_ETHER 648 || ifp->if_type == IFT_L2VLAN) 649 ng_ether_attach(ifp); 650 } 651 IFNET_RUNLOCK(); 652 break; 653 654 case MOD_UNLOAD: 655 656 /* 657 * Note that the base code won't try to unload us until 658 * all nodes have been removed, and that can't happen 659 * until all Ethernet interfaces are removed. In any 660 * case, we know there are no nodes left if the action 661 * is MOD_UNLOAD, so there's no need to detach any nodes. 662 */ 663 664 /* Unregister function hooks */ 665 ng_ether_attach_p = NULL; 666 ng_ether_detach_p = NULL; 667 ng_ether_output_p = NULL; 668 ng_ether_input_p = NULL; 669 ng_ether_input_orphan_p = NULL; 670 break; 671 672 default: 673 error = EOPNOTSUPP; 674 break; 675 } 676 splx(s); 677 return (error); 678 } 679
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