ng_ether.c revision 185571
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 185571 2008-12-02 21:37:28Z bz $ 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#include <sys/vimage.h> 58 59#include <net/if.h> 60#include <net/if_dl.h> 61#include <net/if_types.h> 62#include <net/if_arp.h> 63#include <net/if_var.h> 64#include <net/ethernet.h> 65#include <net/if_bridgevar.h> 66#include <net/vnet.h> 67 68#include <netgraph/ng_message.h> 69#include <netgraph/netgraph.h> 70#include <netgraph/ng_parse.h> 71#include <netgraph/ng_ether.h> 72 73#define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph) 74 75/* Per-node private data */ 76struct private { 77 struct ifnet *ifp; /* associated interface */ 78 hook_p upper; /* upper hook connection */ 79 hook_p lower; /* lower hook connection */ 80 hook_p orphan; /* orphan hook connection */ 81 u_char autoSrcAddr; /* always overwrite source address */ 82 u_char promisc; /* promiscuous mode enabled */ 83 u_long hwassist; /* hardware checksum capabilities */ 84 u_int flags; /* flags e.g. really die */ 85}; 86typedef struct private *priv_p; 87 88/* Hook pointers used by if_ethersubr.c to callback to netgraph */ 89extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 90extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 91extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 92extern void (*ng_ether_attach_p)(struct ifnet *ifp); 93extern void (*ng_ether_detach_p)(struct ifnet *ifp); 94extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 95 96/* Functional hooks called from if_ethersubr.c */ 97static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 98static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 99static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 100static void ng_ether_attach(struct ifnet *ifp); 101static void ng_ether_detach(struct ifnet *ifp); 102static void ng_ether_link_state(struct ifnet *ifp, int state); 103 104/* Other functions */ 105static int ng_ether_rcv_lower(node_p node, struct mbuf *m); 106static int ng_ether_rcv_upper(node_p node, struct mbuf *m); 107 108/* Netgraph node methods */ 109static ng_constructor_t ng_ether_constructor; 110static ng_rcvmsg_t ng_ether_rcvmsg; 111static ng_shutdown_t ng_ether_shutdown; 112static ng_newhook_t ng_ether_newhook; 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 .rcvdata = ng_ether_rcvdata, 208 .disconnect = ng_ether_disconnect, 209 .cmdlist = ng_ether_cmdlist, 210}; 211NETGRAPH_INIT(ether, &ng_ether_typestruct); 212 213/****************************************************************** 214 ETHERNET FUNCTION HOOKS 215******************************************************************/ 216 217/* 218 * Handle a packet that has come in on an interface. We get to 219 * look at it here before any upper layer protocols do. 220 * 221 * NOTE: this function will get called at splimp() 222 */ 223static void 224ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 225{ 226 const node_p node = IFP2NG(ifp); 227 const priv_p priv = NG_NODE_PRIVATE(node); 228 int error; 229 230 /* If "lower" hook not connected, let packet continue */ 231 if (priv->lower == NULL) 232 return; 233 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 234} 235 236/* 237 * Handle a packet that has come in on an interface, and which 238 * does not match any of our known protocols (an ``orphan''). 239 * 240 * NOTE: this function will get called at splimp() 241 */ 242static void 243ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 244{ 245 const node_p node = IFP2NG(ifp); 246 const priv_p priv = NG_NODE_PRIVATE(node); 247 int error; 248 249 /* If "orphan" hook not connected, discard packet */ 250 if (priv->orphan == NULL) { 251 m_freem(m); 252 return; 253 } 254 NG_SEND_DATA_ONLY(error, priv->orphan, m); 255} 256 257/* 258 * Handle a packet that is going out on an interface. 259 * The Ethernet header is already attached to the mbuf. 260 */ 261static int 262ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 263{ 264 const node_p node = IFP2NG(ifp); 265 const priv_p priv = NG_NODE_PRIVATE(node); 266 int error = 0; 267 268 /* If "upper" hook not connected, let packet continue */ 269 if (priv->upper == NULL) 270 return (0); 271 272 /* Send it out "upper" hook */ 273 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 274 return (error); 275} 276 277/* 278 * A new Ethernet interface has been attached. 279 * Create a new node for it, etc. 280 */ 281static void 282ng_ether_attach(struct ifnet *ifp) 283{ 284 priv_p priv; 285 node_p node; 286 287 /* Create node */ 288 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 289 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 290 log(LOG_ERR, "%s: can't %s for %s\n", 291 __func__, "create node", ifp->if_xname); 292 return; 293 } 294 295 /* Allocate private data */ 296 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 297 if (priv == NULL) { 298 log(LOG_ERR, "%s: can't %s for %s\n", 299 __func__, "allocate memory", ifp->if_xname); 300 NG_NODE_UNREF(node); 301 return; 302 } 303 NG_NODE_SET_PRIVATE(node, priv); 304 priv->ifp = ifp; 305 IFP2NG(ifp) = node; 306 priv->hwassist = ifp->if_hwassist; 307 308 /* Try to give the node the same name as the interface */ 309 if (ng_name_node(node, ifp->if_xname) != 0) { 310 log(LOG_WARNING, "%s: can't name node %s\n", 311 __func__, ifp->if_xname); 312 } 313} 314 315/* 316 * An Ethernet interface is being detached. 317 * REALLY Destroy its node. 318 */ 319static void 320ng_ether_detach(struct ifnet *ifp) 321{ 322 const node_p node = IFP2NG(ifp); 323 const priv_p priv = NG_NODE_PRIVATE(node); 324 325 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 326 /* 327 * We can't assume the ifnet is still around when we run shutdown 328 * So zap it now. XXX We HOPE that anything running at this time 329 * handles it (as it should in the non netgraph case). 330 */ 331 IFP2NG(ifp) = NULL; 332 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 333 ng_rmnode_self(node); /* remove all netgraph parts */ 334} 335 336/* 337 * Notify graph about link event. 338 * if_link_state_change() has already checked that the state has changed. 339 */ 340static void 341ng_ether_link_state(struct ifnet *ifp, int state) 342{ 343 const node_p node = IFP2NG(ifp); 344 const priv_p priv = NG_NODE_PRIVATE(node); 345 struct ng_mesg *msg; 346 int cmd, dummy_error = 0; 347 348 if (priv->lower == NULL) 349 return; 350 351 if (state == LINK_STATE_UP) 352 cmd = NGM_LINK_IS_UP; 353 else if (state == LINK_STATE_DOWN) 354 cmd = NGM_LINK_IS_DOWN; 355 else 356 return; 357 358 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 359 if (msg != NULL) 360 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 361} 362 363/****************************************************************** 364 NETGRAPH NODE METHODS 365******************************************************************/ 366 367/* 368 * It is not possible or allowable to create a node of this type. 369 * Nodes get created when the interface is attached (or, when 370 * this node type's KLD is loaded). 371 */ 372static int 373ng_ether_constructor(node_p node) 374{ 375 return (EINVAL); 376} 377 378/* 379 * Check for attaching a new hook. 380 */ 381static int 382ng_ether_newhook(node_p node, hook_p hook, const char *name) 383{ 384 const priv_p priv = NG_NODE_PRIVATE(node); 385 hook_p *hookptr; 386 387 /* Divert hook is an alias for lower */ 388 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 389 name = NG_ETHER_HOOK_LOWER; 390 391 /* Which hook? */ 392 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 393 hookptr = &priv->upper; 394 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) 395 hookptr = &priv->lower; 396 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) 397 hookptr = &priv->orphan; 398 else 399 return (EINVAL); 400 401 /* Check if already connected (shouldn't be, but doesn't hurt) */ 402 if (*hookptr != NULL) 403 return (EISCONN); 404 405 /* Disable hardware checksums while 'upper' hook is connected */ 406 if (hookptr == &priv->upper) 407 priv->ifp->if_hwassist = 0; 408 409 /* OK */ 410 *hookptr = hook; 411 return (0); 412} 413 414/* 415 * Receive an incoming control message. 416 */ 417static int 418ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 419{ 420 const priv_p priv = NG_NODE_PRIVATE(node); 421 struct ng_mesg *resp = NULL; 422 int error = 0; 423 struct ng_mesg *msg; 424 425 NGI_GET_MSG(item, msg); 426 switch (msg->header.typecookie) { 427 case NGM_ETHER_COOKIE: 428 switch (msg->header.cmd) { 429 case NGM_ETHER_GET_IFNAME: 430 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 431 if (resp == NULL) { 432 error = ENOMEM; 433 break; 434 } 435 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 436 break; 437 case NGM_ETHER_GET_IFINDEX: 438 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 439 if (resp == NULL) { 440 error = ENOMEM; 441 break; 442 } 443 *((u_int32_t *)resp->data) = priv->ifp->if_index; 444 break; 445 case NGM_ETHER_GET_ENADDR: 446 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 447 if (resp == NULL) { 448 error = ENOMEM; 449 break; 450 } 451 bcopy(IF_LLADDR(priv->ifp), 452 resp->data, ETHER_ADDR_LEN); 453 break; 454 case NGM_ETHER_SET_ENADDR: 455 { 456 if (msg->header.arglen != ETHER_ADDR_LEN) { 457 error = EINVAL; 458 break; 459 } 460 error = if_setlladdr(priv->ifp, 461 (u_char *)msg->data, ETHER_ADDR_LEN); 462 break; 463 } 464 case NGM_ETHER_GET_PROMISC: 465 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 466 if (resp == NULL) { 467 error = ENOMEM; 468 break; 469 } 470 *((u_int32_t *)resp->data) = priv->promisc; 471 break; 472 case NGM_ETHER_SET_PROMISC: 473 { 474 u_char want; 475 476 if (msg->header.arglen != sizeof(u_int32_t)) { 477 error = EINVAL; 478 break; 479 } 480 want = !!*((u_int32_t *)msg->data); 481 if (want ^ priv->promisc) { 482 if ((error = ifpromisc(priv->ifp, want)) != 0) 483 break; 484 priv->promisc = want; 485 } 486 break; 487 } 488 case NGM_ETHER_GET_AUTOSRC: 489 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 490 if (resp == NULL) { 491 error = ENOMEM; 492 break; 493 } 494 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 495 break; 496 case NGM_ETHER_SET_AUTOSRC: 497 if (msg->header.arglen != sizeof(u_int32_t)) { 498 error = EINVAL; 499 break; 500 } 501 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 502 break; 503 case NGM_ETHER_ADD_MULTI: 504 { 505 struct sockaddr_dl sa_dl; 506 struct ifmultiaddr *ifma; 507 508 if (msg->header.arglen != ETHER_ADDR_LEN) { 509 error = EINVAL; 510 break; 511 } 512 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 513 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 514 sa_dl.sdl_family = AF_LINK; 515 sa_dl.sdl_alen = ETHER_ADDR_LEN; 516 bcopy((void *)msg->data, LLADDR(&sa_dl), 517 ETHER_ADDR_LEN); 518 /* 519 * Netgraph is only permitted to join groups once 520 * via the if_addmulti() KPI, because it cannot hold 521 * struct ifmultiaddr * between calls. It may also 522 * lose a race while we check if the membership 523 * already exists. 524 */ 525 IF_ADDR_LOCK(priv->ifp); 526 ifma = if_findmulti(priv->ifp, 527 (struct sockaddr *)&sa_dl); 528 IF_ADDR_UNLOCK(priv->ifp); 529 if (ifma != NULL) { 530 error = EADDRINUSE; 531 } else { 532 error = if_addmulti(priv->ifp, 533 (struct sockaddr *)&sa_dl, &ifma); 534 } 535 break; 536 } 537 case NGM_ETHER_DEL_MULTI: 538 { 539 struct sockaddr_dl sa_dl; 540 541 if (msg->header.arglen != ETHER_ADDR_LEN) { 542 error = EINVAL; 543 break; 544 } 545 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 546 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 547 sa_dl.sdl_family = AF_LINK; 548 sa_dl.sdl_alen = ETHER_ADDR_LEN; 549 bcopy((void *)msg->data, LLADDR(&sa_dl), 550 ETHER_ADDR_LEN); 551 error = if_delmulti(priv->ifp, 552 (struct sockaddr *)&sa_dl); 553 break; 554 } 555 case NGM_ETHER_DETACH: 556 ng_ether_detach(priv->ifp); 557 break; 558 default: 559 error = EINVAL; 560 break; 561 } 562 break; 563 default: 564 error = EINVAL; 565 break; 566 } 567 NG_RESPOND_MSG(error, node, item, resp); 568 NG_FREE_MSG(msg); 569 return (error); 570} 571 572/* 573 * Receive data on a hook. 574 */ 575static int 576ng_ether_rcvdata(hook_p hook, item_p item) 577{ 578 const node_p node = NG_HOOK_NODE(hook); 579 const priv_p priv = NG_NODE_PRIVATE(node); 580 struct mbuf *m; 581 582 NGI_GET_M(item, m); 583 NG_FREE_ITEM(item); 584 585 if (hook == priv->lower || hook == priv->orphan) 586 return ng_ether_rcv_lower(node, m); 587 if (hook == priv->upper) 588 return ng_ether_rcv_upper(node, m); 589 panic("%s: weird hook", __func__); 590#ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */ 591 return (0); 592#endif 593} 594 595/* 596 * Handle an mbuf received on the "lower" or "orphan" hook. 597 */ 598static int 599ng_ether_rcv_lower(node_p node, struct mbuf *m) 600{ 601 const priv_p priv = NG_NODE_PRIVATE(node); 602 struct ifnet *const ifp = priv->ifp; 603 604 /* Check whether interface is ready for packets */ 605 if (!((ifp->if_flags & IFF_UP) && 606 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 607 NG_FREE_M(m); 608 return (ENETDOWN); 609 } 610 611 /* Make sure header is fully pulled up */ 612 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 613 NG_FREE_M(m); 614 return (EINVAL); 615 } 616 if (m->m_len < sizeof(struct ether_header) 617 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 618 return (ENOBUFS); 619 620 /* Drop in the MAC address if desired */ 621 if (priv->autoSrcAddr) { 622 623 /* Make the mbuf writable if it's not already */ 624 if (!M_WRITABLE(m) 625 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 626 return (ENOBUFS); 627 628 /* Overwrite source MAC address */ 629 bcopy(IF_LLADDR(ifp), 630 mtod(m, struct ether_header *)->ether_shost, 631 ETHER_ADDR_LEN); 632 } 633 634 /* Send it on its way */ 635 return ether_output_frame(ifp, m); 636} 637 638/* 639 * Handle an mbuf received on the "upper" hook. 640 */ 641static int 642ng_ether_rcv_upper(node_p node, struct mbuf *m) 643{ 644 const priv_p priv = NG_NODE_PRIVATE(node); 645 struct ifnet *ifp = priv->ifp; 646 647 /* Check length and pull off header */ 648 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 649 NG_FREE_M(m); 650 return (EINVAL); 651 } 652 if (m->m_len < sizeof(struct ether_header) && 653 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 654 return (ENOBUFS); 655 656 m->m_pkthdr.rcvif = ifp; 657 658 /* Pass the packet to the bridge, it may come back to us */ 659 if (ifp->if_bridge) { 660 BRIDGE_INPUT(ifp, m); 661 if (m == NULL) 662 return (0); 663 } 664 665 /* Route packet back in */ 666 ether_demux(ifp, m); 667 return (0); 668} 669 670/* 671 * Shutdown node. This resets the node but does not remove it 672 * unless the REALLY_DIE flag is set. 673 */ 674static int 675ng_ether_shutdown(node_p node) 676{ 677 const priv_p priv = NG_NODE_PRIVATE(node); 678 679 if (node->nd_flags & NGF_REALLY_DIE) { 680 /* 681 * WE came here because the ethernet card is being unloaded, 682 * so stop being persistant. 683 * Actually undo all the things we did on creation. 684 * Assume the ifp has already been freed. 685 */ 686 NG_NODE_SET_PRIVATE(node, NULL); 687 free(priv, M_NETGRAPH); 688 NG_NODE_UNREF(node); /* free node itself */ 689 return (0); 690 } 691 if (priv->promisc) { /* disable promiscuous mode */ 692 (void)ifpromisc(priv->ifp, 0); 693 priv->promisc = 0; 694 } 695 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 696 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 697 698 return (0); 699} 700 701/* 702 * Hook disconnection. 703 */ 704static int 705ng_ether_disconnect(hook_p hook) 706{ 707 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 708 709 if (hook == priv->upper) { 710 priv->upper = NULL; 711 if (priv->ifp != NULL) /* restore h/w csum */ 712 priv->ifp->if_hwassist = priv->hwassist; 713 } else if (hook == priv->lower) 714 priv->lower = NULL; 715 else if (hook == priv->orphan) 716 priv->orphan = NULL; 717 else 718 panic("%s: weird hook", __func__); 719 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 720 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 721 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 722 return (0); 723} 724 725/****************************************************************** 726 INITIALIZATION 727******************************************************************/ 728 729/* 730 * Handle loading and unloading for this node type. 731 */ 732static int 733ng_ether_mod_event(module_t mod, int event, void *data) 734{ 735 struct ifnet *ifp; 736 int error = 0; 737 int s; 738 739 s = splnet(); 740 switch (event) { 741 case MOD_LOAD: 742 743 /* Register function hooks */ 744 if (ng_ether_attach_p != NULL) { 745 error = EEXIST; 746 break; 747 } 748 ng_ether_attach_p = ng_ether_attach; 749 ng_ether_detach_p = ng_ether_detach; 750 ng_ether_output_p = ng_ether_output; 751 ng_ether_input_p = ng_ether_input; 752 ng_ether_input_orphan_p = ng_ether_input_orphan; 753 ng_ether_link_state_p = ng_ether_link_state; 754 755 /* Create nodes for any already-existing Ethernet interfaces */ 756 IFNET_RLOCK(); 757 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 758 if (ifp->if_type == IFT_ETHER 759 || ifp->if_type == IFT_L2VLAN) 760 ng_ether_attach(ifp); 761 } 762 IFNET_RUNLOCK(); 763 break; 764 765 case MOD_UNLOAD: 766 767 /* 768 * Note that the base code won't try to unload us until 769 * all nodes have been removed, and that can't happen 770 * until all Ethernet interfaces are removed. In any 771 * case, we know there are no nodes left if the action 772 * is MOD_UNLOAD, so there's no need to detach any nodes. 773 */ 774 775 /* Unregister function hooks */ 776 ng_ether_attach_p = NULL; 777 ng_ether_detach_p = NULL; 778 ng_ether_output_p = NULL; 779 ng_ether_input_p = NULL; 780 ng_ether_input_orphan_p = NULL; 781 ng_ether_link_state_p = NULL; 782 break; 783 784 default: 785 error = EOPNOTSUPP; 786 break; 787 } 788 splx(s); 789 return (error); 790} 791 792