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: src/sys/netgraph/ng_ether.c,v 1.62 2007/03/20 00:36:10 bms Exp $ 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/if.h> 59 #include <net/if_dl.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 #include <net/bridge/if_bridgevar.h> 65 66 #include <netgraph7/ng_message.h> 67 #include <netgraph7/netgraph.h> 68 #include <netgraph7/ng_parse.h> 69 #include "ng_ether.h" 70 71 #define IFP2AC(ifp) ((struct arpcom *)ifp) 72 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph) 73 74 /* Per-node private data */ 75 struct private { 76 struct ifnet *ifp; /* associated interface */ 77 hook_p upper; /* upper hook connection */ 78 hook_p lower; /* lower hook connection */ 79 hook_p orphan; /* orphan hook connection */ 80 u_char autoSrcAddr; /* always overwrite source address */ 81 u_char promisc; /* promiscuous mode enabled */ 82 u_long hwassist; /* hardware checksum capabilities */ 83 u_int flags; /* flags e.g. really die */ 84 }; 85 typedef struct private *priv_p; 86 87 /* Functional hooks called from if_ethersubr.c */ 88 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 89 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 90 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 91 static void ng_ether_attach(struct ifnet *ifp); 92 static void ng_ether_detach(struct ifnet *ifp); 93 #if 0 94 static void ng_ether_link_state(struct ifnet *ifp, int state); 95 #endif 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_rcvdata_t ng_ether_rcvdata; 107 static ng_disconnect_t ng_ether_disconnect; 108 static int ng_ether_mod_event(module_t mod, int event, void *data); 109 110 /* List of commands and how to convert arguments to/from ASCII */ 111 static const struct ng_cmdlist ng_ether_cmdlist[] = { 112 { 113 NGM_ETHER_COOKIE, 114 NGM_ETHER_GET_IFNAME, 115 "getifname", 116 NULL, 117 &ng_parse_string_type 118 }, 119 { 120 NGM_ETHER_COOKIE, 121 NGM_ETHER_GET_IFINDEX, 122 "getifindex", 123 NULL, 124 &ng_parse_int32_type 125 }, 126 { 127 NGM_ETHER_COOKIE, 128 NGM_ETHER_GET_ENADDR, 129 "getenaddr", 130 NULL, 131 &ng_parse_enaddr_type 132 }, 133 { 134 NGM_ETHER_COOKIE, 135 NGM_ETHER_SET_ENADDR, 136 "setenaddr", 137 &ng_parse_enaddr_type, 138 NULL 139 }, 140 { 141 NGM_ETHER_COOKIE, 142 NGM_ETHER_GET_PROMISC, 143 "getpromisc", 144 NULL, 145 &ng_parse_int32_type 146 }, 147 { 148 NGM_ETHER_COOKIE, 149 NGM_ETHER_SET_PROMISC, 150 "setpromisc", 151 &ng_parse_int32_type, 152 NULL 153 }, 154 { 155 NGM_ETHER_COOKIE, 156 NGM_ETHER_GET_AUTOSRC, 157 "getautosrc", 158 NULL, 159 &ng_parse_int32_type 160 }, 161 { 162 NGM_ETHER_COOKIE, 163 NGM_ETHER_SET_AUTOSRC, 164 "setautosrc", 165 &ng_parse_int32_type, 166 NULL 167 }, 168 { 169 NGM_ETHER_COOKIE, 170 NGM_ETHER_ADD_MULTI, 171 "addmulti", 172 &ng_parse_enaddr_type, 173 NULL 174 }, 175 { 176 NGM_ETHER_COOKIE, 177 NGM_ETHER_DEL_MULTI, 178 "delmulti", 179 &ng_parse_enaddr_type, 180 NULL 181 }, 182 { 183 NGM_ETHER_COOKIE, 184 NGM_ETHER_DETACH, 185 "detach", 186 NULL, 187 NULL 188 }, 189 { 0 } 190 }; 191 192 static struct ng_type ng_ether_typestruct = { 193 .version = NG_ABI_VERSION, 194 .name = NG_ETHER_NODE_TYPE, 195 .mod_event = ng_ether_mod_event, 196 .constructor = ng_ether_constructor, 197 .rcvmsg = ng_ether_rcvmsg, 198 .shutdown = ng_ether_shutdown, 199 .newhook = ng_ether_newhook, 200 .rcvdata = ng_ether_rcvdata, 201 .disconnect = ng_ether_disconnect, 202 .cmdlist = ng_ether_cmdlist, 203 }; 204 NETGRAPH_INIT(ether, &ng_ether_typestruct); 205 206 /****************************************************************** 207 ETHERNET FUNCTION HOOKS 208 ******************************************************************/ 209 210 /* 211 * Handle a packet that has come in on an interface. We get to 212 * look at it here before any upper layer protocols do. 213 * 214 * NOTE: this function will get called at splimp() 215 */ 216 static void 217 ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 218 { 219 const node_p node = IFP2NG(ifp); 220 const priv_p priv = NG_NODE_PRIVATE(node); 221 int error; 222 223 /* If "lower" hook not connected, let packet continue */ 224 if (priv->lower == NULL) 225 return; 226 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 227 } 228 229 /* 230 * Handle a packet that has come in on an interface, and which 231 * does not match any of our known protocols (an ``orphan''). 232 * 233 * NOTE: this function will get called at splimp() 234 */ 235 static void 236 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 237 { 238 const node_p node = IFP2NG(ifp); 239 const priv_p priv = NG_NODE_PRIVATE(node); 240 int error; 241 242 /* If "orphan" hook not connected, discard packet */ 243 if (priv->orphan == NULL) { 244 m_freem(m); 245 return; 246 } 247 NG_SEND_DATA_ONLY(error, priv->orphan, m); 248 } 249 250 /* 251 * Handle a packet that is going out on an interface. 252 * The Ethernet header is already attached to the mbuf. 253 */ 254 static int 255 ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 256 { 257 const node_p node = IFP2NG(ifp); 258 const priv_p priv = NG_NODE_PRIVATE(node); 259 int error = 0; 260 261 /* If "upper" hook not connected, let packet continue */ 262 if (priv->upper == NULL) 263 return (0); 264 265 /* Send it out "upper" hook */ 266 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 267 return (error); 268 } 269 270 /* 271 * A new Ethernet interface has been attached. 272 * Create a new node for it, etc. 273 */ 274 static void 275 ng_ether_attach(struct ifnet *ifp) 276 { 277 priv_p priv; 278 node_p node; 279 280 /* Create node */ 281 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 282 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 283 log(LOG_ERR, "%s: can't %s for %s\n", 284 __func__, "create node", ifp->if_xname); 285 return; 286 } 287 288 /* Allocate private data */ 289 priv = kmalloc(sizeof(*priv), M_NETGRAPH, 290 M_WAITOK | M_NULLOK | M_ZERO); 291 if (priv == NULL) { 292 log(LOG_ERR, "%s: can't %s for %s\n", 293 __func__, "allocate memory", ifp->if_xname); 294 NG_NODE_UNREF(node); 295 return; 296 } 297 NG_NODE_SET_PRIVATE(node, priv); 298 priv->ifp = ifp; 299 IFP2NG(ifp) = node; 300 priv->hwassist = ifp->if_hwassist; 301 302 /* Try to give the node the same name as the interface */ 303 if (ng_name_node(node, ifp->if_xname) != 0) { 304 log(LOG_WARNING, "%s: can't name node %s\n", 305 __func__, ifp->if_xname); 306 } 307 } 308 309 /* 310 * An Ethernet interface is being detached. 311 * REALLY Destroy its node. 312 */ 313 static void 314 ng_ether_detach(struct ifnet *ifp) 315 { 316 const node_p node = IFP2NG(ifp); 317 const priv_p priv = NG_NODE_PRIVATE(node); 318 319 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 320 /* 321 * We can't assume the ifnet is still around when we run shutdown 322 * So zap it now. XXX We HOPE that anything running at this time 323 * handles it (as it should in the non netgraph case). 324 */ 325 IFP2NG(ifp) = NULL; 326 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 327 ng_rmnode_self(node); /* remove all netgraph parts */ 328 } 329 330 #if 0 331 /* 332 * Notify graph about link event. 333 * if_link_state_change() has already checked that the state has changed. 334 */ 335 static void 336 ng_ether_link_state(struct ifnet *ifp, int state) 337 { 338 const node_p node = IFP2NG(ifp); 339 const priv_p priv = NG_NODE_PRIVATE(node); 340 struct ng_mesg *msg; 341 int cmd, dummy_error = 0; 342 343 if (priv->lower == NULL) 344 return; 345 346 if (state == LINK_STATE_UP) 347 cmd = NGM_LINK_IS_UP; 348 else if (state == LINK_STATE_DOWN) 349 cmd = NGM_LINK_IS_DOWN; 350 else 351 return; 352 353 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_WAITOK | M_NULLOK); 354 if (msg != NULL) 355 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 356 } 357 #endif 358 /****************************************************************** 359 NETGRAPH NODE METHODS 360 ******************************************************************/ 361 362 /* 363 * It is not possible or allowable to create a node of this type. 364 * Nodes get created when the interface is attached (or, when 365 * this node type's KLD is loaded). 366 */ 367 static int 368 ng_ether_constructor(node_p node) 369 { 370 return (EINVAL); 371 } 372 373 /* 374 * Check for attaching a new hook. 375 */ 376 static int 377 ng_ether_newhook(node_p node, hook_p hook, const char *name) 378 { 379 const priv_p priv = NG_NODE_PRIVATE(node); 380 hook_p *hookptr; 381 382 /* Divert hook is an alias for lower */ 383 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 384 name = NG_ETHER_HOOK_LOWER; 385 386 /* Which hook? */ 387 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 388 hookptr = &priv->upper; 389 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) 390 hookptr = &priv->lower; 391 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) 392 hookptr = &priv->orphan; 393 else 394 return (EINVAL); 395 396 /* Check if already connected (shouldn't be, but doesn't hurt) */ 397 if (*hookptr != NULL) 398 return (EISCONN); 399 400 /* Disable hardware checksums while 'upper' hook is connected */ 401 if (hookptr == &priv->upper) 402 priv->ifp->if_hwassist = 0; 403 404 /* OK */ 405 *hookptr = hook; 406 return (0); 407 } 408 409 /* 410 * Receive an incoming control message. 411 */ 412 static int 413 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 414 { 415 const priv_p priv = NG_NODE_PRIVATE(node); 416 struct ng_mesg *resp = NULL; 417 int error = 0; 418 struct ng_mesg *msg; 419 420 NGI_GET_MSG(item, msg); 421 switch (msg->header.typecookie) { 422 case NGM_ETHER_COOKIE: 423 switch (msg->header.cmd) { 424 case NGM_ETHER_GET_IFNAME: 425 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK); 426 if (resp == NULL) { 427 error = ENOMEM; 428 break; 429 } 430 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 431 break; 432 case NGM_ETHER_GET_IFINDEX: 433 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK); 434 if (resp == NULL) { 435 error = ENOMEM; 436 break; 437 } 438 *((u_int32_t *)resp->data) = priv->ifp->if_index; 439 break; 440 case NGM_ETHER_GET_ENADDR: 441 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_WAITOK | M_NULLOK); 442 if (resp == NULL) { 443 error = ENOMEM; 444 break; 445 } 446 bcopy(IF_LLADDR(priv->ifp), 447 resp->data, ETHER_ADDR_LEN); 448 break; 449 case NGM_ETHER_SET_ENADDR: 450 { 451 if (msg->header.arglen != ETHER_ADDR_LEN) { 452 error = EINVAL; 453 break; 454 } 455 error = if_setlladdr(priv->ifp, 456 (u_char *)msg->data, ETHER_ADDR_LEN); 457 break; 458 } 459 case NGM_ETHER_GET_PROMISC: 460 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK); 461 if (resp == NULL) { 462 error = ENOMEM; 463 break; 464 } 465 *((u_int32_t *)resp->data) = priv->promisc; 466 break; 467 case NGM_ETHER_SET_PROMISC: 468 { 469 u_char want; 470 471 if (msg->header.arglen != sizeof(u_int32_t)) { 472 error = EINVAL; 473 break; 474 } 475 want = !!*((u_int32_t *)msg->data); 476 if (want ^ priv->promisc) { 477 if ((error = ifpromisc(priv->ifp, want)) != 0) 478 break; 479 priv->promisc = want; 480 } 481 break; 482 } 483 case NGM_ETHER_GET_AUTOSRC: 484 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK); 485 if (resp == NULL) { 486 error = ENOMEM; 487 break; 488 } 489 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 490 break; 491 case NGM_ETHER_SET_AUTOSRC: 492 if (msg->header.arglen != sizeof(u_int32_t)) { 493 error = EINVAL; 494 break; 495 } 496 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 497 break; 498 #if 0 499 case NGM_ETHER_ADD_MULTI: 500 { 501 struct sockaddr_dl sa_dl; 502 struct ifmultiaddr *ifma; 503 504 if (msg->header.arglen != ETHER_ADDR_LEN) { 505 error = EINVAL; 506 break; 507 } 508 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 509 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 510 sa_dl.sdl_family = AF_LINK; 511 sa_dl.sdl_alen = ETHER_ADDR_LEN; 512 bcopy((void *)msg->data, LLADDR(&sa_dl), 513 ETHER_ADDR_LEN); 514 /* 515 * Netgraph is only permitted to join groups once 516 * via the if_addmulti() KPI, because it cannot hold 517 * struct ifmultiaddr * between calls. It may also 518 * lose a race while we check if the membership 519 * already exists. 520 */ 521 IF_ADDR_LOCK(priv->ifp); 522 ifma = if_findmulti(priv->ifp, 523 (struct sockaddr *)&sa_dl); 524 IF_ADDR_UNLOCK(priv->ifp); 525 if (ifma != NULL) { 526 error = EADDRINUSE; 527 } else { 528 error = if_addmulti(priv->ifp, 529 (struct sockaddr *)&sa_dl, &ifma); 530 } 531 break; 532 } 533 #endif 534 case NGM_ETHER_DEL_MULTI: 535 { 536 struct sockaddr_dl sa_dl; 537 538 if (msg->header.arglen != ETHER_ADDR_LEN) { 539 error = EINVAL; 540 break; 541 } 542 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 543 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 544 sa_dl.sdl_family = AF_LINK; 545 sa_dl.sdl_alen = ETHER_ADDR_LEN; 546 bcopy((void *)msg->data, LLADDR(&sa_dl), 547 ETHER_ADDR_LEN); 548 error = if_delmulti(priv->ifp, 549 (struct sockaddr *)&sa_dl); 550 break; 551 } 552 case NGM_ETHER_DETACH: 553 ng_ether_detach(priv->ifp); 554 break; 555 default: 556 error = EINVAL; 557 break; 558 } 559 break; 560 default: 561 error = EINVAL; 562 break; 563 } 564 NG_RESPOND_MSG(error, node, item, resp); 565 NG_FREE_MSG(msg); 566 return (error); 567 } 568 569 /* 570 * Receive data on a hook. 571 */ 572 static int 573 ng_ether_rcvdata(hook_p hook, item_p item) 574 { 575 const node_p node = NG_HOOK_NODE(hook); 576 const priv_p priv = NG_NODE_PRIVATE(node); 577 struct mbuf *m; 578 579 NGI_GET_M(item, m); 580 NG_FREE_ITEM(item); 581 582 if (hook == priv->lower || hook == priv->orphan) 583 return ng_ether_rcv_lower(node, m); 584 if (hook == priv->upper) 585 return ng_ether_rcv_upper(node, m); 586 panic("%s: weird hook", __func__); 587 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */ 588 return (0); 589 #endif 590 } 591 592 /* 593 * Handle an mbuf received on the "lower" or "orphan" hook. 594 */ 595 static int 596 ng_ether_rcv_lower(node_p node, struct mbuf *m) 597 { 598 const priv_p priv = NG_NODE_PRIVATE(node); 599 struct ifnet *const ifp = priv->ifp; 600 601 /* Check whether interface is ready for packets */ 602 if (!((ifp->if_flags & IFF_UP) && 603 (ifp->if_flags & IFF_RUNNING))) { 604 NG_FREE_M(m); 605 return (ENETDOWN); 606 } 607 608 /* Make sure header is fully pulled up */ 609 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 610 NG_FREE_M(m); 611 return (EINVAL); 612 } 613 if (m->m_len < sizeof(struct ether_header) 614 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 615 return (ENOBUFS); 616 617 /* Drop in the MAC address if desired */ 618 if (priv->autoSrcAddr) { 619 620 /* Make the mbuf writable if it's not already */ 621 if (!M_WRITABLE(m) 622 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 623 return (ENOBUFS); 624 625 /* Overwrite source MAC address */ 626 bcopy(IF_LLADDR(ifp), 627 mtod(m, struct ether_header *)->ether_shost, 628 ETHER_ADDR_LEN); 629 } 630 631 /* Send it on its way */ 632 return ether_output_frame(ifp, m); 633 } 634 635 /* 636 * Handle an mbuf received on the "upper" hook. 637 */ 638 extern struct mbuf *bridge_input_p(struct ifnet *, struct mbuf *); 639 static int 640 ng_ether_rcv_upper(node_p node, struct mbuf *m) 641 { 642 const priv_p priv = NG_NODE_PRIVATE(node); 643 struct ifnet *ifp = priv->ifp; 644 645 /* Check length and pull off header */ 646 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 647 NG_FREE_M(m); 648 return (EINVAL); 649 } 650 if (m->m_len < sizeof(struct ether_header) && 651 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 652 return (ENOBUFS); 653 654 m->m_pkthdr.rcvif = ifp; 655 656 /* Pass the packet to the bridge, it may come back to us */ 657 if (ifp->if_bridge) { 658 bridge_input_p(ifp, m); 659 if (m == NULL) 660 return (0); 661 } 662 663 /* Route packet back in */ 664 ether_demux_oncpu(ifp, m); 665 return (0); 666 } 667 668 /* 669 * Shutdown node. This resets the node but does not remove it 670 * unless the REALLY_DIE flag is set. 671 */ 672 static int 673 ng_ether_shutdown(node_p node) 674 { 675 const priv_p priv = NG_NODE_PRIVATE(node); 676 677 if (node->nd_flags & NGF_REALLY_DIE) { 678 /* 679 * WE came here because the ethernet card is being unloaded, 680 * so stop being persistant. 681 * Actually undo all the things we did on creation. 682 * Assume the ifp has already been freed. 683 */ 684 NG_NODE_SET_PRIVATE(node, NULL); 685 kfree(priv, M_NETGRAPH); 686 NG_NODE_UNREF(node); /* free node itself */ 687 return (0); 688 } 689 if (priv->promisc) { /* disable promiscuous mode */ 690 (void)ifpromisc(priv->ifp, 0); 691 priv->promisc = 0; 692 } 693 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 694 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 695 696 return (0); 697 } 698 699 /* 700 * Hook disconnection. 701 */ 702 static int 703 ng_ether_disconnect(hook_p hook) 704 { 705 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 706 707 if (hook == priv->upper) { 708 priv->upper = NULL; 709 if (priv->ifp != NULL) /* restore h/w csum */ 710 priv->ifp->if_hwassist = priv->hwassist; 711 } else if (hook == priv->lower) 712 priv->lower = NULL; 713 else if (hook == priv->orphan) 714 priv->orphan = NULL; 715 else 716 panic("%s: weird hook", __func__); 717 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 718 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 719 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 720 return (0); 721 } 722 723 /****************************************************************** 724 INITIALIZATION 725 ******************************************************************/ 726 727 /* 728 * Handle loading and unloading for this node type. 729 */ 730 static int 731 ng_ether_mod_event(module_t mod, int event, void *data) 732 { 733 struct ifnet *ifp; 734 int error = 0; 735 736 crit_enter(); 737 switch (event) { 738 case MOD_LOAD: 739 740 /* Register function hooks */ 741 if (ng_ether_attach_p != NULL) { 742 error = EEXIST; 743 break; 744 } 745 ng_ether_attach_p = ng_ether_attach; 746 ng_ether_detach_p = ng_ether_detach; 747 ng_ether_output_p = ng_ether_output; 748 ng_ether_input_p = ng_ether_input; 749 ng_ether_input_orphan_p = ng_ether_input_orphan; 750 #if 0 751 ng_ether_link_state_p = ng_ether_link_state; 752 #endif 753 754 /* Create nodes for any already-existing Ethernet interfaces */ 755 ifnet_lock(); 756 TAILQ_FOREACH(ifp, &ifnetlist, if_link) { 757 if (ifp->if_type == IFT_ETHER 758 || ifp->if_type == IFT_L2VLAN) 759 ng_ether_attach(ifp); 760 } 761 ifnet_unlock(); 762 break; 763 764 case MOD_UNLOAD: 765 766 /* 767 * Note that the base code won't try to unload us until 768 * all nodes have been removed, and that can't happen 769 * until all Ethernet interfaces are removed. In any 770 * case, we know there are no nodes left if the action 771 * is MOD_UNLOAD, so there's no need to detach any nodes. 772 */ 773 774 /* Unregister function hooks */ 775 ng_ether_attach_p = NULL; 776 ng_ether_detach_p = NULL; 777 ng_ether_output_p = NULL; 778 ng_ether_input_p = NULL; 779 ng_ether_input_orphan_p = NULL; 780 #if 0 781 ng_ether_link_state_p = NULL; 782 #endif 783 break; 784 785 default: 786 error = EOPNOTSUPP; 787 break; 788 } 789 crit_exit(); 790 return (error); 791 } 792 793