ng_ether.c revision 152001
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 152001 2005-11-03 07:46:04Z ru $ 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/if_bridgevar.h> 65 66#include <netgraph/ng_message.h> 67#include <netgraph/netgraph.h> 68#include <netgraph/ng_parse.h> 69#include <netgraph/ng_ether.h> 70 71#define IFP2NG(ifp) ((struct ng_node *)IFP2AC((ifp))->ac_netgraph) 72#define IFP2NG_SET(ifp, val) (IFP2AC((ifp))->ac_netgraph = (val)) 73 74/* Per-node private data */ 75struct 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}; 85typedef struct private *priv_p; 86 87/* Hook pointers used by if_ethersubr.c to callback to netgraph */ 88extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 89extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 90extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 91extern void (*ng_ether_attach_p)(struct ifnet *ifp); 92extern void (*ng_ether_detach_p)(struct ifnet *ifp); 93extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 94 95/* Functional hooks called from if_ethersubr.c */ 96static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 97static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 98static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 99static void ng_ether_attach(struct ifnet *ifp); 100static void ng_ether_detach(struct ifnet *ifp); 101static void ng_ether_link_state(struct ifnet *ifp, int state); 102 103/* Other functions */ 104static int ng_ether_rcv_lower(node_p node, struct mbuf *m); 105static int ng_ether_rcv_upper(node_p node, struct mbuf *m); 106 107/* Netgraph node methods */ 108static ng_constructor_t ng_ether_constructor; 109static ng_rcvmsg_t ng_ether_rcvmsg; 110static ng_shutdown_t ng_ether_shutdown; 111static ng_newhook_t ng_ether_newhook; 112static ng_connect_t ng_ether_connect; 113static ng_rcvdata_t ng_ether_rcvdata; 114static ng_disconnect_t ng_ether_disconnect; 115static int ng_ether_mod_event(module_t mod, int event, void *data); 116 117/* List of commands and how to convert arguments to/from ASCII */ 118static const struct ng_cmdlist ng_ether_cmdlist[] = { 119 { 120 NGM_ETHER_COOKIE, 121 NGM_ETHER_GET_IFNAME, 122 "getifname", 123 NULL, 124 &ng_parse_string_type 125 }, 126 { 127 NGM_ETHER_COOKIE, 128 NGM_ETHER_GET_IFINDEX, 129 "getifindex", 130 NULL, 131 &ng_parse_int32_type 132 }, 133 { 134 NGM_ETHER_COOKIE, 135 NGM_ETHER_GET_ENADDR, 136 "getenaddr", 137 NULL, 138 &ng_parse_enaddr_type 139 }, 140 { 141 NGM_ETHER_COOKIE, 142 NGM_ETHER_SET_ENADDR, 143 "setenaddr", 144 &ng_parse_enaddr_type, 145 NULL 146 }, 147 { 148 NGM_ETHER_COOKIE, 149 NGM_ETHER_GET_PROMISC, 150 "getpromisc", 151 NULL, 152 &ng_parse_int32_type 153 }, 154 { 155 NGM_ETHER_COOKIE, 156 NGM_ETHER_SET_PROMISC, 157 "setpromisc", 158 &ng_parse_int32_type, 159 NULL 160 }, 161 { 162 NGM_ETHER_COOKIE, 163 NGM_ETHER_GET_AUTOSRC, 164 "getautosrc", 165 NULL, 166 &ng_parse_int32_type 167 }, 168 { 169 NGM_ETHER_COOKIE, 170 NGM_ETHER_SET_AUTOSRC, 171 "setautosrc", 172 &ng_parse_int32_type, 173 NULL 174 }, 175 { 176 NGM_ETHER_COOKIE, 177 NGM_ETHER_ADD_MULTI, 178 "addmulti", 179 &ng_parse_enaddr_type, 180 NULL 181 }, 182 { 183 NGM_ETHER_COOKIE, 184 NGM_ETHER_DEL_MULTI, 185 "delmulti", 186 &ng_parse_enaddr_type, 187 NULL 188 }, 189 { 190 NGM_ETHER_COOKIE, 191 NGM_ETHER_DETACH, 192 "detach", 193 NULL, 194 NULL 195 }, 196 { 0 } 197}; 198 199static struct ng_type ng_ether_typestruct = { 200 .version = NG_ABI_VERSION, 201 .name = NG_ETHER_NODE_TYPE, 202 .mod_event = ng_ether_mod_event, 203 .constructor = ng_ether_constructor, 204 .rcvmsg = ng_ether_rcvmsg, 205 .shutdown = ng_ether_shutdown, 206 .newhook = ng_ether_newhook, 207 .connect = ng_ether_connect, 208 .rcvdata = ng_ether_rcvdata, 209 .disconnect = ng_ether_disconnect, 210 .cmdlist = ng_ether_cmdlist, 211}; 212NETGRAPH_INIT(ether, &ng_ether_typestruct); 213 214/****************************************************************** 215 ETHERNET FUNCTION HOOKS 216******************************************************************/ 217 218/* 219 * Handle a packet that has come in on an interface. We get to 220 * look at it here before any upper layer protocols do. 221 * 222 * NOTE: this function will get called at splimp() 223 */ 224static void 225ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 226{ 227 const node_p node = IFP2NG(ifp); 228 const priv_p priv = NG_NODE_PRIVATE(node); 229 int error; 230 231 /* If "lower" hook not connected, let packet continue */ 232 if (priv->lower == NULL) 233 return; 234 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 235} 236 237/* 238 * Handle a packet that has come in on an interface, and which 239 * does not match any of our known protocols (an ``orphan''). 240 * 241 * NOTE: this function will get called at splimp() 242 */ 243static void 244ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 245{ 246 const node_p node = IFP2NG(ifp); 247 const priv_p priv = NG_NODE_PRIVATE(node); 248 int error; 249 250 /* If "orphan" hook not connected, discard packet */ 251 if (priv->orphan == NULL) { 252 m_freem(m); 253 return; 254 } 255 NG_SEND_DATA_ONLY(error, priv->orphan, m); 256} 257 258/* 259 * Handle a packet that is going out on an interface. 260 * The Ethernet header is already attached to the mbuf. 261 */ 262static int 263ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 264{ 265 const node_p node = IFP2NG(ifp); 266 const priv_p priv = NG_NODE_PRIVATE(node); 267 int error = 0; 268 269 /* If "upper" hook not connected, let packet continue */ 270 if (priv->upper == NULL) 271 return (0); 272 273 /* Send it out "upper" hook */ 274 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 275 return (error); 276} 277 278/* 279 * A new Ethernet interface has been attached. 280 * Create a new node for it, etc. 281 */ 282static void 283ng_ether_attach(struct ifnet *ifp) 284{ 285 priv_p priv; 286 node_p node; 287 288 /* Create node */ 289 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 290 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 291 log(LOG_ERR, "%s: can't %s for %s\n", 292 __func__, "create node", ifp->if_xname); 293 return; 294 } 295 296 /* Allocate private data */ 297 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 298 if (priv == NULL) { 299 log(LOG_ERR, "%s: can't %s for %s\n", 300 __func__, "allocate memory", ifp->if_xname); 301 NG_NODE_UNREF(node); 302 return; 303 } 304 NG_NODE_SET_PRIVATE(node, priv); 305 priv->ifp = ifp; 306 IFP2NG_SET(ifp, node); 307 priv->autoSrcAddr = 1; 308 priv->hwassist = ifp->if_hwassist; 309 310 /* Try to give the node the same name as the interface */ 311 if (ng_name_node(node, ifp->if_xname) != 0) { 312 log(LOG_WARNING, "%s: can't name node %s\n", 313 __func__, ifp->if_xname); 314 } 315} 316 317/* 318 * An Ethernet interface is being detached. 319 * REALLY Destroy its node. 320 */ 321static void 322ng_ether_detach(struct ifnet *ifp) 323{ 324 const node_p node = IFP2NG(ifp); 325 const priv_p priv = NG_NODE_PRIVATE(node); 326 327 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 328 /* 329 * We can't assume the ifnet is still around when we run shutdown 330 * So zap it now. XXX We HOPE that anything running at this time 331 * handles it (as it should in the non netgraph case). 332 */ 333 IFP2NG_SET(ifp, NULL); 334 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 335 ng_rmnode_self(node); /* remove all netgraph parts */ 336} 337 338/* 339 * Notify graph about link event. 340 * if_link_state_change() has already checked that the state has changed. 341 */ 342static void 343ng_ether_link_state(struct ifnet *ifp, int state) 344{ 345 const node_p node = IFP2NG(ifp); 346 const priv_p priv = NG_NODE_PRIVATE(node); 347 struct ng_mesg *msg; 348 int cmd, dummy_error = 0; 349 350 if (priv->lower == NULL) 351 return; 352 353 if (state == LINK_STATE_UP) 354 cmd = NGM_LINK_IS_UP; 355 else if (state == LINK_STATE_DOWN) 356 cmd = NGM_LINK_IS_DOWN; 357 else 358 return; 359 360 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 361 if (msg != NULL) 362 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 363} 364 365/****************************************************************** 366 NETGRAPH NODE METHODS 367******************************************************************/ 368 369/* 370 * It is not possible or allowable to create a node of this type. 371 * Nodes get created when the interface is attached (or, when 372 * this node type's KLD is loaded). 373 */ 374static int 375ng_ether_constructor(node_p node) 376{ 377 return (EINVAL); 378} 379 380/* 381 * Check for attaching a new hook. 382 */ 383static int 384ng_ether_newhook(node_p node, hook_p hook, const char *name) 385{ 386 const priv_p priv = NG_NODE_PRIVATE(node); 387 hook_p *hookptr; 388 389 /* Divert hook is an alias for lower */ 390 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 391 name = NG_ETHER_HOOK_LOWER; 392 393 /* Which hook? */ 394 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 395 hookptr = &priv->upper; 396 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) 397 hookptr = &priv->lower; 398 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) 399 hookptr = &priv->orphan; 400 else 401 return (EINVAL); 402 403 /* Check if already connected (shouldn't be, but doesn't hurt) */ 404 if (*hookptr != NULL) 405 return (EISCONN); 406 407 /* Disable hardware checksums while 'upper' hook is connected */ 408 if (hookptr == &priv->upper) 409 priv->ifp->if_hwassist = 0; 410 411 /* OK */ 412 *hookptr = hook; 413 return (0); 414} 415 416/* 417 * Hooks are attached, adjust to force queueing. 418 * We don't really care which hook it is. 419 * they should all be queuing for outgoing data. 420 */ 421static int 422ng_ether_connect(hook_p hook) 423{ 424 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); 425 return (0); 426} 427 428/* 429 * Receive an incoming control message. 430 */ 431static int 432ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 433{ 434 const priv_p priv = NG_NODE_PRIVATE(node); 435 struct ng_mesg *resp = NULL; 436 int error = 0; 437 struct ng_mesg *msg; 438 439 NGI_GET_MSG(item, msg); 440 switch (msg->header.typecookie) { 441 case NGM_ETHER_COOKIE: 442 switch (msg->header.cmd) { 443 case NGM_ETHER_GET_IFNAME: 444 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 445 if (resp == NULL) { 446 error = ENOMEM; 447 break; 448 } 449 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 450 break; 451 case NGM_ETHER_GET_IFINDEX: 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->ifp->if_index; 458 break; 459 case NGM_ETHER_GET_ENADDR: 460 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 461 if (resp == NULL) { 462 error = ENOMEM; 463 break; 464 } 465 bcopy(IFP2ENADDR(priv->ifp), 466 resp->data, ETHER_ADDR_LEN); 467 break; 468 case NGM_ETHER_SET_ENADDR: 469 { 470 if (msg->header.arglen != ETHER_ADDR_LEN) { 471 error = EINVAL; 472 break; 473 } 474 error = if_setlladdr(priv->ifp, 475 (u_char *)msg->data, ETHER_ADDR_LEN); 476 break; 477 } 478 case NGM_ETHER_GET_PROMISC: 479 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 480 if (resp == NULL) { 481 error = ENOMEM; 482 break; 483 } 484 *((u_int32_t *)resp->data) = priv->promisc; 485 break; 486 case NGM_ETHER_SET_PROMISC: 487 { 488 u_char want; 489 490 if (msg->header.arglen != sizeof(u_int32_t)) { 491 error = EINVAL; 492 break; 493 } 494 want = !!*((u_int32_t *)msg->data); 495 if (want ^ priv->promisc) { 496 if ((error = ifpromisc(priv->ifp, want)) != 0) 497 break; 498 priv->promisc = want; 499 } 500 break; 501 } 502 case NGM_ETHER_GET_AUTOSRC: 503 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 504 if (resp == NULL) { 505 error = ENOMEM; 506 break; 507 } 508 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 509 break; 510 case NGM_ETHER_SET_AUTOSRC: 511 if (msg->header.arglen != sizeof(u_int32_t)) { 512 error = EINVAL; 513 break; 514 } 515 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 516 break; 517 case NGM_ETHER_ADD_MULTI: 518 { 519 struct sockaddr_dl sa_dl; 520 struct ifmultiaddr *ifm; 521 522 if (msg->header.arglen != ETHER_ADDR_LEN) { 523 error = EINVAL; 524 break; 525 } 526 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 527 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 528 sa_dl.sdl_family = AF_LINK; 529 sa_dl.sdl_alen = ETHER_ADDR_LEN; 530 bcopy((void *)msg->data, LLADDR(&sa_dl), 531 ETHER_ADDR_LEN); 532 error = if_addmulti(priv->ifp, 533 (struct sockaddr *)&sa_dl, &ifm); 534 break; 535 } 536 case NGM_ETHER_DEL_MULTI: 537 { 538 struct sockaddr_dl sa_dl; 539 540 if (msg->header.arglen != ETHER_ADDR_LEN) { 541 error = EINVAL; 542 break; 543 } 544 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 545 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 546 sa_dl.sdl_family = AF_LINK; 547 sa_dl.sdl_alen = ETHER_ADDR_LEN; 548 bcopy((void *)msg->data, LLADDR(&sa_dl), 549 ETHER_ADDR_LEN); 550 error = if_delmulti(priv->ifp, 551 (struct sockaddr *)&sa_dl); 552 break; 553 } 554 case NGM_ETHER_DETACH: 555 ng_ether_detach(priv->ifp); 556 break; 557 default: 558 error = EINVAL; 559 break; 560 } 561 break; 562 default: 563 error = EINVAL; 564 break; 565 } 566 NG_RESPOND_MSG(error, node, item, resp); 567 NG_FREE_MSG(msg); 568 return (error); 569} 570 571/* 572 * Receive data on a hook. 573 */ 574static int 575ng_ether_rcvdata(hook_p hook, item_p item) 576{ 577 const node_p node = NG_HOOK_NODE(hook); 578 const priv_p priv = NG_NODE_PRIVATE(node); 579 struct mbuf *m; 580 581 NGI_GET_M(item, m); 582 NG_FREE_ITEM(item); 583 584 if (hook == priv->lower || hook == priv->orphan) 585 return ng_ether_rcv_lower(node, m); 586 if (hook == priv->upper) 587 return ng_ether_rcv_upper(node, m); 588 panic("%s: weird hook", __func__); 589#ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */ 590 return (0); 591#endif 592} 593 594/* 595 * Handle an mbuf received on the "lower" or "orphan" hook. 596 */ 597static int 598ng_ether_rcv_lower(node_p node, struct mbuf *m) 599{ 600 const priv_p priv = NG_NODE_PRIVATE(node); 601 struct ifnet *const ifp = priv->ifp; 602 603 /* Check whether interface is ready for packets */ 604 if (!((ifp->if_flags & IFF_UP) && 605 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 606 NG_FREE_M(m); 607 return (ENETDOWN); 608 } 609 610 /* Make sure header is fully pulled up */ 611 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 612 NG_FREE_M(m); 613 return (EINVAL); 614 } 615 if (m->m_len < sizeof(struct ether_header) 616 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 617 return (ENOBUFS); 618 619 /* Drop in the MAC address if desired */ 620 if (priv->autoSrcAddr) { 621 622 /* Make the mbuf writable if it's not already */ 623 if (!M_WRITABLE(m) 624 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 625 return (ENOBUFS); 626 627 /* Overwrite source MAC address */ 628 bcopy(IFP2ENADDR(ifp), 629 mtod(m, struct ether_header *)->ether_shost, 630 ETHER_ADDR_LEN); 631 } 632 633 /* Send it on its way */ 634 return ether_output_frame(ifp, m); 635} 636 637/* 638 * Handle an mbuf received on the "upper" hook. 639 */ 640static int 641ng_ether_rcv_upper(node_p node, struct mbuf *m) 642{ 643 const priv_p priv = NG_NODE_PRIVATE(node); 644 struct ifnet *ifp = priv->ifp; 645 646 /* Check length and pull off header */ 647 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 648 NG_FREE_M(m); 649 return (EINVAL); 650 } 651 if (m->m_len < sizeof(struct ether_header) && 652 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 653 return (ENOBUFS); 654 655 m->m_pkthdr.rcvif = ifp; 656 657 /* Pass the packet to the bridge, it may come back to us */ 658 if (ifp->if_bridge) { 659 BRIDGE_INPUT(ifp, m); 660 if (m == NULL) 661 return (0); 662 } 663 664 /* Route packet back in */ 665 ether_demux(ifp, m); 666 return (0); 667} 668 669/* 670 * Shutdown node. This resets the node but does not remove it 671 * unless the REALLY_DIE flag is set. 672 */ 673static int 674ng_ether_shutdown(node_p node) 675{ 676 const priv_p priv = NG_NODE_PRIVATE(node); 677 678 if (node->nd_flags & NGF_REALLY_DIE) { 679 /* 680 * WE came here because the ethernet card is being unloaded, 681 * so stop being persistant. 682 * Actually undo all the things we did on creation. 683 * Assume the ifp has already been freed. 684 */ 685 NG_NODE_SET_PRIVATE(node, NULL); 686 FREE(priv, M_NETGRAPH); 687 NG_NODE_UNREF(node); /* free node itself */ 688 return (0); 689 } 690 if (priv->promisc) { /* disable promiscuous mode */ 691 (void)ifpromisc(priv->ifp, 0); 692 priv->promisc = 0; 693 } 694 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 695 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 696 697 return (0); 698} 699 700/* 701 * Hook disconnection. 702 */ 703static int 704ng_ether_disconnect(hook_p hook) 705{ 706 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 707 708 if (hook == priv->upper) { 709 priv->upper = NULL; 710 if (priv->ifp != NULL) /* restore h/w csum */ 711 priv->ifp->if_hwassist = priv->hwassist; 712 } else if (hook == priv->lower) 713 priv->lower = NULL; 714 else if (hook == priv->orphan) 715 priv->orphan = NULL; 716 else 717 panic("%s: weird hook", __func__); 718 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 719 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 720 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 721 return (0); 722} 723 724/****************************************************************** 725 INITIALIZATION 726******************************************************************/ 727 728/* 729 * Handle loading and unloading for this node type. 730 */ 731static int 732ng_ether_mod_event(module_t mod, int event, void *data) 733{ 734 struct ifnet *ifp; 735 int error = 0; 736 int s; 737 738 s = splnet(); 739 switch (event) { 740 case MOD_LOAD: 741 742 /* Register function hooks */ 743 if (ng_ether_attach_p != NULL) { 744 error = EEXIST; 745 break; 746 } 747 ng_ether_attach_p = ng_ether_attach; 748 ng_ether_detach_p = ng_ether_detach; 749 ng_ether_output_p = ng_ether_output; 750 ng_ether_input_p = ng_ether_input; 751 ng_ether_input_orphan_p = ng_ether_input_orphan; 752 ng_ether_link_state_p = ng_ether_link_state; 753 754 /* Create nodes for any already-existing Ethernet interfaces */ 755 IFNET_RLOCK(); 756 TAILQ_FOREACH(ifp, &ifnet, if_link) { 757 if (ifp->if_type == IFT_ETHER 758 || ifp->if_type == IFT_L2VLAN) 759 ng_ether_attach(ifp); 760 } 761 IFNET_RUNLOCK(); 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 ng_ether_link_state_p = NULL; 781 break; 782 783 default: 784 error = EOPNOTSUPP; 785 break; 786 } 787 splx(s); 788 return (error); 789} 790 791