ng_ether.c revision 150636
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 150636 2005-09-27 18:10:43Z mlaier $ 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 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 *)IFP2AC((ifp))->ac_netgraph) 71#define IFP2NG_SET(ifp, val) (IFP2AC((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 { 175 NGM_ETHER_COOKIE, 176 NGM_ETHER_ADD_MULTI, 177 "addmulti", 178 &ng_parse_enaddr_type, 179 NULL 180 }, 181 { 182 NGM_ETHER_COOKIE, 183 NGM_ETHER_DEL_MULTI, 184 "delmulti", 185 &ng_parse_enaddr_type, 186 NULL 187 }, 188 { 189 NGM_ETHER_COOKIE, 190 NGM_ETHER_DETACH, 191 "detach", 192 NULL, 193 NULL 194 }, 195 { 0 } 196}; 197 198static struct ng_type ng_ether_typestruct = { 199 .version = NG_ABI_VERSION, 200 .name = NG_ETHER_NODE_TYPE, 201 .mod_event = ng_ether_mod_event, 202 .constructor = ng_ether_constructor, 203 .rcvmsg = ng_ether_rcvmsg, 204 .shutdown = ng_ether_shutdown, 205 .newhook = ng_ether_newhook, 206 .connect = ng_ether_connect, 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 MALLOC(priv, priv_p, 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_SET(ifp, node); 306 priv->autoSrcAddr = 1; 307 priv->hwassist = ifp->if_hwassist; 308 309 /* Try to give the node the same name as the interface */ 310 if (ng_name_node(node, ifp->if_xname) != 0) { 311 log(LOG_WARNING, "%s: can't name node %s\n", 312 __func__, ifp->if_xname); 313 } 314} 315 316/* 317 * An Ethernet interface is being detached. 318 * REALLY Destroy its node. 319 */ 320static void 321ng_ether_detach(struct ifnet *ifp) 322{ 323 const node_p node = IFP2NG(ifp); 324 const priv_p priv = NG_NODE_PRIVATE(node); 325 326 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 327 /* 328 * We can't assume the ifnet is still around when we run shutdown 329 * So zap it now. XXX We HOPE that anything running at this time 330 * handles it (as it should in the non netgraph case). 331 */ 332 IFP2NG_SET(ifp, NULL); 333 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 334 ng_rmnode_self(node); /* remove all netgraph parts */ 335} 336 337/* 338 * Notify graph about link event. 339 * if_link_state_change() has already checked that the state has changed. 340 */ 341static void 342ng_ether_link_state(struct ifnet *ifp, int state) 343{ 344 const node_p node = IFP2NG(ifp); 345 const priv_p priv = NG_NODE_PRIVATE(node); 346 struct ng_mesg *msg; 347 int cmd, dummy_error = 0; 348 349 if (priv->lower == NULL) 350 return; 351 352 if (state == LINK_STATE_UP) 353 cmd = NGM_LINK_IS_UP; 354 else if (state == LINK_STATE_DOWN) 355 cmd = NGM_LINK_IS_DOWN; 356 else 357 return; 358 359 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 360 if (msg != NULL) 361 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 362} 363 364/****************************************************************** 365 NETGRAPH NODE METHODS 366******************************************************************/ 367 368/* 369 * It is not possible or allowable to create a node of this type. 370 * Nodes get created when the interface is attached (or, when 371 * this node type's KLD is loaded). 372 */ 373static int 374ng_ether_constructor(node_p node) 375{ 376 return (EINVAL); 377} 378 379/* 380 * Check for attaching a new hook. 381 */ 382static int 383ng_ether_newhook(node_p node, hook_p hook, const char *name) 384{ 385 const priv_p priv = NG_NODE_PRIVATE(node); 386 hook_p *hookptr; 387 388 /* Divert hook is an alias for lower */ 389 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 390 name = NG_ETHER_HOOK_LOWER; 391 392 /* Which hook? */ 393 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 394 hookptr = &priv->upper; 395 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) 396 hookptr = &priv->lower; 397 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) 398 hookptr = &priv->orphan; 399 else 400 return (EINVAL); 401 402 /* Check if already connected (shouldn't be, but doesn't hurt) */ 403 if (*hookptr != NULL) 404 return (EISCONN); 405 406 /* Disable hardware checksums while 'upper' hook is connected */ 407 if (hookptr == &priv->upper) 408 priv->ifp->if_hwassist = 0; 409 410 /* OK */ 411 *hookptr = hook; 412 return (0); 413} 414 415/* 416 * Hooks are attached, adjust to force queueing. 417 * We don't really care which hook it is. 418 * they should all be queuing for outgoing data. 419 */ 420static int 421ng_ether_connect(hook_p hook) 422{ 423 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); 424 return (0); 425} 426 427/* 428 * Receive an incoming control message. 429 */ 430static int 431ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 432{ 433 const priv_p priv = NG_NODE_PRIVATE(node); 434 struct ng_mesg *resp = NULL; 435 int error = 0; 436 struct ng_mesg *msg; 437 438 NGI_GET_MSG(item, msg); 439 switch (msg->header.typecookie) { 440 case NGM_ETHER_COOKIE: 441 switch (msg->header.cmd) { 442 case NGM_ETHER_GET_IFNAME: 443 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 444 if (resp == NULL) { 445 error = ENOMEM; 446 break; 447 } 448 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 449 break; 450 case NGM_ETHER_GET_IFINDEX: 451 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 452 if (resp == NULL) { 453 error = ENOMEM; 454 break; 455 } 456 *((u_int32_t *)resp->data) = priv->ifp->if_index; 457 break; 458 case NGM_ETHER_GET_ENADDR: 459 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 460 if (resp == NULL) { 461 error = ENOMEM; 462 break; 463 } 464 bcopy(IFP2ENADDR(priv->ifp), 465 resp->data, ETHER_ADDR_LEN); 466 break; 467 case NGM_ETHER_SET_ENADDR: 468 { 469 if (msg->header.arglen != ETHER_ADDR_LEN) { 470 error = EINVAL; 471 break; 472 } 473 error = if_setlladdr(priv->ifp, 474 (u_char *)msg->data, ETHER_ADDR_LEN); 475 break; 476 } 477 case NGM_ETHER_GET_PROMISC: 478 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 479 if (resp == NULL) { 480 error = ENOMEM; 481 break; 482 } 483 *((u_int32_t *)resp->data) = priv->promisc; 484 break; 485 case NGM_ETHER_SET_PROMISC: 486 { 487 u_char want; 488 489 if (msg->header.arglen != sizeof(u_int32_t)) { 490 error = EINVAL; 491 break; 492 } 493 want = !!*((u_int32_t *)msg->data); 494 if (want ^ priv->promisc) { 495 if ((error = ifpromisc(priv->ifp, want)) != 0) 496 break; 497 priv->promisc = want; 498 } 499 break; 500 } 501 case NGM_ETHER_GET_AUTOSRC: 502 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 503 if (resp == NULL) { 504 error = ENOMEM; 505 break; 506 } 507 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 508 break; 509 case NGM_ETHER_SET_AUTOSRC: 510 if (msg->header.arglen != sizeof(u_int32_t)) { 511 error = EINVAL; 512 break; 513 } 514 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 515 break; 516 case NGM_ETHER_ADD_MULTI: 517 { 518 struct sockaddr_dl sa_dl; 519 struct ifmultiaddr *ifm; 520 521 if (msg->header.arglen != ETHER_ADDR_LEN) { 522 error = EINVAL; 523 break; 524 } 525 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 526 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 527 sa_dl.sdl_family = AF_LINK; 528 sa_dl.sdl_alen = ETHER_ADDR_LEN; 529 bcopy((void *)msg->data, LLADDR(&sa_dl), 530 ETHER_ADDR_LEN); 531 error = if_addmulti(priv->ifp, 532 (struct sockaddr *)&sa_dl, &ifm); 533 break; 534 } 535 case NGM_ETHER_DEL_MULTI: 536 { 537 struct sockaddr_dl sa_dl; 538 539 if (msg->header.arglen != ETHER_ADDR_LEN) { 540 error = EINVAL; 541 break; 542 } 543 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 544 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 545 sa_dl.sdl_family = AF_LINK; 546 sa_dl.sdl_alen = ETHER_ADDR_LEN; 547 bcopy((void *)msg->data, LLADDR(&sa_dl), 548 ETHER_ADDR_LEN); 549 error = if_delmulti(priv->ifp, 550 (struct sockaddr *)&sa_dl); 551 break; 552 } 553 case NGM_ETHER_DETACH: 554 ng_ether_detach(priv->ifp); 555 break; 556 default: 557 error = EINVAL; 558 break; 559 } 560 break; 561 default: 562 error = EINVAL; 563 break; 564 } 565 NG_RESPOND_MSG(error, node, item, resp); 566 NG_FREE_MSG(msg); 567 return (error); 568} 569 570/* 571 * Receive data on a hook. 572 */ 573static int 574ng_ether_rcvdata(hook_p hook, item_p item) 575{ 576 const node_p node = NG_HOOK_NODE(hook); 577 const priv_p priv = NG_NODE_PRIVATE(node); 578 struct mbuf *m; 579 580 NGI_GET_M(item, m); 581 NG_FREE_ITEM(item); 582 583 if (hook == priv->lower || hook == priv->orphan) 584 return ng_ether_rcv_lower(node, m); 585 if (hook == priv->upper) 586 return ng_ether_rcv_upper(node, m); 587 panic("%s: weird hook", __func__); 588#ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */ 589 return (0); 590#endif 591} 592 593/* 594 * Handle an mbuf received on the "lower" or "orphan" hook. 595 */ 596static int 597ng_ether_rcv_lower(node_p node, struct mbuf *m) 598{ 599 const priv_p priv = NG_NODE_PRIVATE(node); 600 struct ifnet *const ifp = priv->ifp; 601 602 /* Check whether interface is ready for packets */ 603 if (!((ifp->if_flags & IFF_UP) && 604 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 605 NG_FREE_M(m); 606 return (ENETDOWN); 607 } 608 609 /* Make sure header is fully pulled up */ 610 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 611 NG_FREE_M(m); 612 return (EINVAL); 613 } 614 if (m->m_len < sizeof(struct ether_header) 615 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 616 return (ENOBUFS); 617 618 /* Drop in the MAC address if desired */ 619 if (priv->autoSrcAddr) { 620 621 /* Make the mbuf writable if it's not already */ 622 if (!M_WRITABLE(m) 623 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 624 return (ENOBUFS); 625 626 /* Overwrite source MAC address */ 627 bcopy(IFP2ENADDR(ifp), 628 mtod(m, struct ether_header *)->ether_shost, 629 ETHER_ADDR_LEN); 630 } 631 632 /* Send it on its way */ 633 return ether_output_frame(ifp, m); 634} 635 636/* 637 * Handle an mbuf received on the "upper" hook. 638 */ 639static int 640ng_ether_rcv_upper(node_p node, struct mbuf *m) 641{ 642 const priv_p priv = NG_NODE_PRIVATE(node); 643 644 m->m_pkthdr.rcvif = priv->ifp; 645 646 /* XXX: if_bridge hook here? */ 647 648 /* Route packet back in */ 649 ether_demux(priv->ifp, m); 650 return (0); 651} 652 653/* 654 * Shutdown node. This resets the node but does not remove it 655 * unless the REALLY_DIE flag is set. 656 */ 657static int 658ng_ether_shutdown(node_p node) 659{ 660 const priv_p priv = NG_NODE_PRIVATE(node); 661 662 if (node->nd_flags & NGF_REALLY_DIE) { 663 /* 664 * WE came here because the ethernet card is being unloaded, 665 * so stop being persistant. 666 * Actually undo all the things we did on creation. 667 * Assume the ifp has already been freed. 668 */ 669 NG_NODE_SET_PRIVATE(node, NULL); 670 FREE(priv, M_NETGRAPH); 671 NG_NODE_UNREF(node); /* free node itself */ 672 return (0); 673 } 674 if (priv->promisc) { /* disable promiscuous mode */ 675 (void)ifpromisc(priv->ifp, 0); 676 priv->promisc = 0; 677 } 678 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 679 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 680 681 return (0); 682} 683 684/* 685 * Hook disconnection. 686 */ 687static int 688ng_ether_disconnect(hook_p hook) 689{ 690 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 691 692 if (hook == priv->upper) { 693 priv->upper = NULL; 694 if (priv->ifp != NULL) /* restore h/w csum */ 695 priv->ifp->if_hwassist = priv->hwassist; 696 } else if (hook == priv->lower) 697 priv->lower = NULL; 698 else if (hook == priv->orphan) 699 priv->orphan = NULL; 700 else 701 panic("%s: weird hook", __func__); 702 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 703 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 704 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 705 return (0); 706} 707 708/****************************************************************** 709 INITIALIZATION 710******************************************************************/ 711 712/* 713 * Handle loading and unloading for this node type. 714 */ 715static int 716ng_ether_mod_event(module_t mod, int event, void *data) 717{ 718 struct ifnet *ifp; 719 int error = 0; 720 int s; 721 722 s = splnet(); 723 switch (event) { 724 case MOD_LOAD: 725 726 /* Register function hooks */ 727 if (ng_ether_attach_p != NULL) { 728 error = EEXIST; 729 break; 730 } 731 ng_ether_attach_p = ng_ether_attach; 732 ng_ether_detach_p = ng_ether_detach; 733 ng_ether_output_p = ng_ether_output; 734 ng_ether_input_p = ng_ether_input; 735 ng_ether_input_orphan_p = ng_ether_input_orphan; 736 ng_ether_link_state_p = ng_ether_link_state; 737 738 /* Create nodes for any already-existing Ethernet interfaces */ 739 IFNET_RLOCK(); 740 TAILQ_FOREACH(ifp, &ifnet, if_link) { 741 if (ifp->if_type == IFT_ETHER 742 || ifp->if_type == IFT_L2VLAN) 743 ng_ether_attach(ifp); 744 } 745 IFNET_RUNLOCK(); 746 break; 747 748 case MOD_UNLOAD: 749 750 /* 751 * Note that the base code won't try to unload us until 752 * all nodes have been removed, and that can't happen 753 * until all Ethernet interfaces are removed. In any 754 * case, we know there are no nodes left if the action 755 * is MOD_UNLOAD, so there's no need to detach any nodes. 756 */ 757 758 /* Unregister function hooks */ 759 ng_ether_attach_p = NULL; 760 ng_ether_detach_p = NULL; 761 ng_ether_output_p = NULL; 762 ng_ether_input_p = NULL; 763 ng_ether_input_orphan_p = NULL; 764 ng_ether_link_state_p = NULL; 765 break; 766 767 default: 768 error = EOPNOTSUPP; 769 break; 770 } 771 splx(s); 772 return (error); 773} 774 775