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 * $FreeBSD$ 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 67 #include <netgraph/ng_message.h> 68 #include <netgraph/netgraph.h> 69 #include <netgraph/ng_parse.h> 70 #include <netgraph/ng_ether.h> 71 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 /* Hook pointers used by if_ethersubr.c to callback to netgraph */ 88 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 89 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 90 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 91 extern void (*ng_ether_attach_p)(struct ifnet *ifp); 92 extern void (*ng_ether_detach_p)(struct ifnet *ifp); 93 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 94 95 /* Functional hooks called from if_ethersubr.c */ 96 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 97 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 98 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 99 static void ng_ether_attach(struct ifnet *ifp); 100 static void ng_ether_detach(struct ifnet *ifp); 101 static void ng_ether_link_state(struct ifnet *ifp, int state); 102 103 /* Other functions */ 104 static int ng_ether_rcv_lower(node_p node, struct mbuf *m); 105 static int ng_ether_rcv_upper(node_p node, struct mbuf *m); 106 107 /* Netgraph node methods */ 108 static ng_constructor_t ng_ether_constructor; 109 static ng_rcvmsg_t ng_ether_rcvmsg; 110 static ng_shutdown_t ng_ether_shutdown; 111 static ng_newhook_t ng_ether_newhook; 112 static ng_rcvdata_t ng_ether_rcvdata; 113 static ng_disconnect_t ng_ether_disconnect; 114 static 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 */ 117 static 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 }; 197 198 static 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 .rcvdata = ng_ether_rcvdata, 207 .disconnect = ng_ether_disconnect, 208 .cmdlist = ng_ether_cmdlist, 209 }; 210 NETGRAPH_INIT(ether, &ng_ether_typestruct); 211 212 /****************************************************************** 213 ETHERNET FUNCTION HOOKS 214 ******************************************************************/ 215 216 /* 217 * Handle a packet that has come in on an interface. We get to 218 * look at it here before any upper layer protocols do. 219 * 220 * NOTE: this function will get called at splimp() 221 */ 222 static void 223 ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 224 { 225 const node_p node = IFP2NG(ifp); 226 const priv_p priv = NG_NODE_PRIVATE(node); 227 int error; 228 229 /* If "lower" hook not connected, let packet continue */ 230 if (priv->lower == NULL) 231 return; 232 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 233 } 234 235 /* 236 * Handle a packet that has come in on an interface, and which 237 * does not match any of our known protocols (an ``orphan''). 238 * 239 * NOTE: this function will get called at splimp() 240 */ 241 static void 242 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 243 { 244 const node_p node = IFP2NG(ifp); 245 const priv_p priv = NG_NODE_PRIVATE(node); 246 int error; 247 248 /* If "orphan" hook not connected, discard packet */ 249 if (priv->orphan == NULL) { 250 m_freem(m); 251 return; 252 } 253 NG_SEND_DATA_ONLY(error, priv->orphan, m); 254 } 255 256 /* 257 * Handle a packet that is going out on an interface. 258 * The Ethernet header is already attached to the mbuf. 259 */ 260 static int 261 ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 262 { 263 const node_p node = IFP2NG(ifp); 264 const priv_p priv = NG_NODE_PRIVATE(node); 265 int error = 0; 266 267 /* If "upper" hook not connected, let packet continue */ 268 if (priv->upper == NULL) 269 return (0); 270 271 /* Send it out "upper" hook */ 272 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 273 return (error); 274 } 275 276 /* 277 * A new Ethernet interface has been attached. 278 * Create a new node for it, etc. 279 */ 280 static void 281 ng_ether_attach(struct ifnet *ifp) 282 { 283 priv_p priv; 284 node_p node; 285 286 /* Create node */ 287 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 288 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 289 log(LOG_ERR, "%s: can't %s for %s\n", 290 __func__, "create node", ifp->if_xname); 291 return; 292 } 293 294 /* Allocate private data */ 295 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 296 if (priv == NULL) { 297 log(LOG_ERR, "%s: can't %s for %s\n", 298 __func__, "allocate memory", ifp->if_xname); 299 NG_NODE_UNREF(node); 300 return; 301 } 302 NG_NODE_SET_PRIVATE(node, priv); 303 priv->ifp = ifp; 304 IFP2NG(ifp) = node; 305 priv->hwassist = ifp->if_hwassist; 306 307 /* Try to give the node the same name as the interface */ 308 if (ng_name_node(node, ifp->if_xname) != 0) { 309 log(LOG_WARNING, "%s: can't name node %s\n", 310 __func__, ifp->if_xname); 311 } 312 } 313 314 /* 315 * An Ethernet interface is being detached. 316 * REALLY Destroy its node. 317 */ 318 static void 319 ng_ether_detach(struct ifnet *ifp) 320 { 321 const node_p node = IFP2NG(ifp); 322 const priv_p priv = NG_NODE_PRIVATE(node); 323 324 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 325 /* 326 * We can't assume the ifnet is still around when we run shutdown 327 * So zap it now. XXX We HOPE that anything running at this time 328 * handles it (as it should in the non netgraph case). 329 */ 330 IFP2NG(ifp) = NULL; 331 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 332 ng_rmnode_self(node); /* remove all netgraph parts */ 333 } 334 335 /* 336 * Notify graph about link event. 337 * if_link_state_change() has already checked that the state has changed. 338 */ 339 static void 340 ng_ether_link_state(struct ifnet *ifp, int state) 341 { 342 const node_p node = IFP2NG(ifp); 343 const priv_p priv = NG_NODE_PRIVATE(node); 344 struct ng_mesg *msg; 345 int cmd, dummy_error = 0; 346 347 if (priv->lower == NULL) 348 return; 349 350 if (state == LINK_STATE_UP) 351 cmd = NGM_LINK_IS_UP; 352 else if (state == LINK_STATE_DOWN) 353 cmd = NGM_LINK_IS_DOWN; 354 else 355 return; 356 357 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 358 if (msg != NULL) 359 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 360 } 361 362 /****************************************************************** 363 NETGRAPH NODE METHODS 364 ******************************************************************/ 365 366 /* 367 * It is not possible or allowable to create a node of this type. 368 * Nodes get created when the interface is attached (or, when 369 * this node type's KLD is loaded). 370 */ 371 static int 372 ng_ether_constructor(node_p node) 373 { 374 return (EINVAL); 375 } 376 377 /* 378 * Check for attaching a new hook. 379 */ 380 static int 381 ng_ether_newhook(node_p node, hook_p hook, const char *name) 382 { 383 const priv_p priv = NG_NODE_PRIVATE(node); 384 hook_p *hookptr; 385 386 /* Divert hook is an alias for lower */ 387 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 388 name = NG_ETHER_HOOK_LOWER; 389 390 /* Which hook? */ 391 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 392 hookptr = &priv->upper; 393 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) 394 hookptr = &priv->lower; 395 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) 396 hookptr = &priv->orphan; 397 else 398 return (EINVAL); 399 400 /* Check if already connected (shouldn't be, but doesn't hurt) */ 401 if (*hookptr != NULL) 402 return (EISCONN); 403 404 /* Disable hardware checksums while 'upper' hook is connected */ 405 if (hookptr == &priv->upper) 406 priv->ifp->if_hwassist = 0; 407 408 /* OK */ 409 *hookptr = hook; 410 return (0); 411 } 412 413 /* 414 * Receive an incoming control message. 415 */ 416 static int 417 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 418 { 419 const priv_p priv = NG_NODE_PRIVATE(node); 420 struct ng_mesg *resp = NULL; 421 int error = 0; 422 struct ng_mesg *msg; 423 424 NGI_GET_MSG(item, msg); 425 switch (msg->header.typecookie) { 426 case NGM_ETHER_COOKIE: 427 switch (msg->header.cmd) { 428 case NGM_ETHER_GET_IFNAME: 429 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 430 if (resp == NULL) { 431 error = ENOMEM; 432 break; 433 } 434 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 435 break; 436 case NGM_ETHER_GET_IFINDEX: 437 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 438 if (resp == NULL) { 439 error = ENOMEM; 440 break; 441 } 442 *((u_int32_t *)resp->data) = priv->ifp->if_index; 443 break; 444 case NGM_ETHER_GET_ENADDR: 445 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 446 if (resp == NULL) { 447 error = ENOMEM; 448 break; 449 } 450 bcopy(IF_LLADDR(priv->ifp), 451 resp->data, ETHER_ADDR_LEN); 452 break; 453 case NGM_ETHER_SET_ENADDR: 454 { 455 if (msg->header.arglen != ETHER_ADDR_LEN) { 456 error = EINVAL; 457 break; 458 } 459 error = if_setlladdr(priv->ifp, 460 (u_char *)msg->data, ETHER_ADDR_LEN); 461 break; 462 } 463 case NGM_ETHER_GET_PROMISC: 464 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 465 if (resp == NULL) { 466 error = ENOMEM; 467 break; 468 } 469 *((u_int32_t *)resp->data) = priv->promisc; 470 break; 471 case NGM_ETHER_SET_PROMISC: 472 { 473 u_char want; 474 475 if (msg->header.arglen != sizeof(u_int32_t)) { 476 error = EINVAL; 477 break; 478 } 479 want = !!*((u_int32_t *)msg->data); 480 if (want ^ priv->promisc) { 481 if ((error = ifpromisc(priv->ifp, want)) != 0) 482 break; 483 priv->promisc = want; 484 } 485 break; 486 } 487 case NGM_ETHER_GET_AUTOSRC: 488 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 489 if (resp == NULL) { 490 error = ENOMEM; 491 break; 492 } 493 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 494 break; 495 case NGM_ETHER_SET_AUTOSRC: 496 if (msg->header.arglen != sizeof(u_int32_t)) { 497 error = EINVAL; 498 break; 499 } 500 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 501 break; 502 case NGM_ETHER_ADD_MULTI: 503 { 504 struct sockaddr_dl sa_dl; 505 struct ifmultiaddr *ifma; 506 507 if (msg->header.arglen != ETHER_ADDR_LEN) { 508 error = EINVAL; 509 break; 510 } 511 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 512 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 513 sa_dl.sdl_family = AF_LINK; 514 sa_dl.sdl_alen = ETHER_ADDR_LEN; 515 bcopy((void *)msg->data, LLADDR(&sa_dl), 516 ETHER_ADDR_LEN); 517 /* 518 * Netgraph is only permitted to join groups once 519 * via the if_addmulti() KPI, because it cannot hold 520 * struct ifmultiaddr * between calls. It may also 521 * lose a race while we check if the membership 522 * already exists. 523 */ 524 IF_ADDR_LOCK(priv->ifp); 525 ifma = if_findmulti(priv->ifp, 526 (struct sockaddr *)&sa_dl); 527 IF_ADDR_UNLOCK(priv->ifp); 528 if (ifma != NULL) { 529 error = EADDRINUSE; 530 } else { 531 error = if_addmulti(priv->ifp, 532 (struct sockaddr *)&sa_dl, &ifma); 533 } 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 */ 574 static int 575 ng_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 */ 597 static int 598 ng_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(IF_LLADDR(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 */ 640 static int 641 ng_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 */ 673 static int 674 ng_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 */ 703 static int 704 ng_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 */ 731 static int 732 ng_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, &V_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