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sys/netgraph/ng_ether.c
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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 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) (IFP2AC((ifp))->ac_netgraph) 72 73 /* Per-node private data */ 74 struct 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 }; 84 typedef struct private *priv_p; 85 86 /* Hook pointers used by if_ethersubr.c to callback to netgraph */ 87 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 88 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 89 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 90 extern void (*ng_ether_attach_p)(struct ifnet *ifp); 91 extern void (*ng_ether_detach_p)(struct ifnet *ifp); 92 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 93 94 /* Functional hooks called from if_ethersubr.c */ 95 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 96 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 97 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 98 static void ng_ether_attach(struct ifnet *ifp); 99 static void ng_ether_detach(struct ifnet *ifp); 100 static void ng_ether_link_state(struct ifnet *ifp, int state); 101 102 /* Other functions */ 103 static int ng_ether_rcv_lower(node_p node, struct mbuf *m); 104 static int ng_ether_rcv_upper(node_p node, struct mbuf *m); 105 106 /* Netgraph node methods */ 107 static ng_constructor_t ng_ether_constructor; 108 static ng_rcvmsg_t ng_ether_rcvmsg; 109 static ng_shutdown_t ng_ether_shutdown; 110 static ng_newhook_t ng_ether_newhook; 111 static ng_rcvdata_t ng_ether_rcvdata; 112 static ng_disconnect_t ng_ether_disconnect; 113 static int ng_ether_mod_event(module_t mod, int event, void *data); 114 115 /* List of commands and how to convert arguments to/from ASCII */ 116 static const struct ng_cmdlist ng_ether_cmdlist[] = { 117 { 118 NGM_ETHER_COOKIE, 119 NGM_ETHER_GET_IFNAME, 120 "getifname", 121 NULL, 122 &ng_parse_string_type 123 }, 124 { 125 NGM_ETHER_COOKIE, 126 NGM_ETHER_GET_IFINDEX, 127 "getifindex", 128 NULL, 129 &ng_parse_int32_type 130 }, 131 { 132 NGM_ETHER_COOKIE, 133 NGM_ETHER_GET_ENADDR, 134 "getenaddr", 135 NULL, 136 &ng_parse_enaddr_type 137 }, 138 { 139 NGM_ETHER_COOKIE, 140 NGM_ETHER_SET_ENADDR, 141 "setenaddr", 142 &ng_parse_enaddr_type, 143 NULL 144 }, 145 { 146 NGM_ETHER_COOKIE, 147 NGM_ETHER_GET_PROMISC, 148 "getpromisc", 149 NULL, 150 &ng_parse_int32_type 151 }, 152 { 153 NGM_ETHER_COOKIE, 154 NGM_ETHER_SET_PROMISC, 155 "setpromisc", 156 &ng_parse_int32_type, 157 NULL 158 }, 159 { 160 NGM_ETHER_COOKIE, 161 NGM_ETHER_GET_AUTOSRC, 162 "getautosrc", 163 NULL, 164 &ng_parse_int32_type 165 }, 166 { 167 NGM_ETHER_COOKIE, 168 NGM_ETHER_SET_AUTOSRC, 169 "setautosrc", 170 &ng_parse_int32_type, 171 NULL 172 }, 173 { 174 NGM_ETHER_COOKIE, 175 NGM_ETHER_ADD_MULTI, 176 "addmulti", 177 &ng_parse_enaddr_type, 178 NULL 179 }, 180 { 181 NGM_ETHER_COOKIE, 182 NGM_ETHER_DEL_MULTI, 183 "delmulti", 184 &ng_parse_enaddr_type, 185 NULL 186 }, 187 { 188 NGM_ETHER_COOKIE, 189 NGM_ETHER_DETACH, 190 "detach", 191 NULL, 192 NULL 193 }, 194 { 0 } 195 }; 196 197 static struct ng_type ng_ether_typestruct = { 198 .version = NG_ABI_VERSION, 199 .name = NG_ETHER_NODE_TYPE, 200 .mod_event = ng_ether_mod_event, 201 .constructor = ng_ether_constructor, 202 .rcvmsg = ng_ether_rcvmsg, 203 .shutdown = ng_ether_shutdown, 204 .newhook = ng_ether_newhook, 205 .rcvdata = ng_ether_rcvdata, 206 .disconnect = ng_ether_disconnect, 207 .cmdlist = ng_ether_cmdlist, 208 }; 209 NETGRAPH_INIT(ether, &ng_ether_typestruct); 210 211 /****************************************************************** 212 ETHERNET FUNCTION HOOKS 213 ******************************************************************/ 214 215 /* 216 * Handle a packet that has come in on an interface. We get to 217 * look at it here before any upper layer protocols do. 218 * 219 * NOTE: this function will get called at splimp() 220 */ 221 static void 222 ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 223 { 224 const node_p node = IFP2NG(ifp); 225 const priv_p priv = NG_NODE_PRIVATE(node); 226 int error; 227 228 /* If "lower" hook not connected, let packet continue */ 229 if (priv->lower == NULL) 230 return; 231 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 232 } 233 234 /* 235 * Handle a packet that has come in on an interface, and which 236 * does not match any of our known protocols (an ``orphan''). 237 * 238 * NOTE: this function will get called at splimp() 239 */ 240 static void 241 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 242 { 243 const node_p node = IFP2NG(ifp); 244 const priv_p priv = NG_NODE_PRIVATE(node); 245 int error; 246 247 /* If "orphan" hook not connected, discard packet */ 248 if (priv->orphan == NULL) { 249 m_freem(m); 250 return; 251 } 252 NG_SEND_DATA_ONLY(error, priv->orphan, m); 253 } 254 255 /* 256 * Handle a packet that is going out on an interface. 257 * The Ethernet header is already attached to the mbuf. 258 */ 259 static int 260 ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 261 { 262 const node_p node = IFP2NG(ifp); 263 const priv_p priv = NG_NODE_PRIVATE(node); 264 int error = 0; 265 266 /* If "upper" hook not connected, let packet continue */ 267 if (priv->upper == NULL) 268 return (0); 269 270 /* Send it out "upper" hook */ 271 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 272 return (error); 273 } 274 275 /* 276 * A new Ethernet interface has been attached. 277 * Create a new node for it, etc. 278 */ 279 static void 280 ng_ether_attach(struct ifnet *ifp) 281 { 282 priv_p priv; 283 node_p node; 284 285 /* Create node */ 286 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 287 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 288 log(LOG_ERR, "%s: can't %s for %s\n", 289 __func__, "create node", ifp->if_xname); 290 return; 291 } 292 293 /* Allocate private data */ 294 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 295 if (priv == NULL) { 296 log(LOG_ERR, "%s: can't %s for %s\n", 297 __func__, "allocate memory", ifp->if_xname); 298 NG_NODE_UNREF(node); 299 return; 300 } 301 NG_NODE_SET_PRIVATE(node, priv); 302 priv->ifp = ifp; 303 IFP2NG(ifp) = node; 304 priv->hwassist = ifp->if_hwassist; 305 306 /* Try to give the node the same name as the interface */ 307 if (ng_name_node(node, ifp->if_xname) != 0) { 308 log(LOG_WARNING, "%s: can't name node %s\n", 309 __func__, ifp->if_xname); 310 } 311 } 312 313 /* 314 * An Ethernet interface is being detached. 315 * REALLY Destroy its node. 316 */ 317 static void 318 ng_ether_detach(struct ifnet *ifp) 319 { 320 const node_p node = IFP2NG(ifp); 321 const priv_p priv = NG_NODE_PRIVATE(node); 322 323 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 324 /* 325 * We can't assume the ifnet is still around when we run shutdown 326 * So zap it now. XXX We HOPE that anything running at this time 327 * handles it (as it should in the non netgraph case). 328 */ 329 IFP2NG(ifp) = NULL; 330 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 331 ng_rmnode_self(node); /* remove all netgraph parts */ 332 } 333 334 /* 335 * Notify graph about link event. 336 * if_link_state_change() has already checked that the state has changed. 337 */ 338 static void 339 ng_ether_link_state(struct ifnet *ifp, int state) 340 { 341 const node_p node = IFP2NG(ifp); 342 const priv_p priv = NG_NODE_PRIVATE(node); 343 struct ng_mesg *msg; 344 int cmd, dummy_error = 0; 345 346 if (priv->lower == NULL) 347 return; 348 349 if (state == LINK_STATE_UP) 350 cmd = NGM_LINK_IS_UP; 351 else if (state == LINK_STATE_DOWN) 352 cmd = NGM_LINK_IS_DOWN; 353 else 354 return; 355 356 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 357 if (msg != NULL) 358 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 359 } 360 361 /****************************************************************** 362 NETGRAPH NODE METHODS 363 ******************************************************************/ 364 365 /* 366 * It is not possible or allowable to create a node of this type. 367 * Nodes get created when the interface is attached (or, when 368 * this node type's KLD is loaded). 369 */ 370 static int 371 ng_ether_constructor(node_p node) 372 { 373 return (EINVAL); 374 } 375 376 /* 377 * Check for attaching a new hook. 378 */ 379 static int 380 ng_ether_newhook(node_p node, hook_p hook, const char *name) 381 { 382 const priv_p priv = NG_NODE_PRIVATE(node); 383 hook_p *hookptr; 384 385 /* Divert hook is an alias for lower */ 386 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 387 name = NG_ETHER_HOOK_LOWER; 388 389 /* Which hook? */ 390 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 391 hookptr = &priv->upper; 392 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) 393 hookptr = &priv->lower; 394 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) 395 hookptr = &priv->orphan; 396 else 397 return (EINVAL); 398 399 /* Check if already connected (shouldn't be, but doesn't hurt) */ 400 if (*hookptr != NULL) 401 return (EISCONN); 402 403 /* Disable hardware checksums while 'upper' hook is connected */ 404 if (hookptr == &priv->upper) 405 priv->ifp->if_hwassist = 0; 406 407 /* OK */ 408 *hookptr = hook; 409 return (0); 410 } 411 412 /* 413 * Receive an incoming control message. 414 */ 415 static int 416 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 417 { 418 const priv_p priv = NG_NODE_PRIVATE(node); 419 struct ng_mesg *resp = NULL; 420 int error = 0; 421 struct ng_mesg *msg; 422 423 NGI_GET_MSG(item, msg); 424 switch (msg->header.typecookie) { 425 case NGM_ETHER_COOKIE: 426 switch (msg->header.cmd) { 427 case NGM_ETHER_GET_IFNAME: 428 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 429 if (resp == NULL) { 430 error = ENOMEM; 431 break; 432 } 433 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 434 break; 435 case NGM_ETHER_GET_IFINDEX: 436 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 437 if (resp == NULL) { 438 error = ENOMEM; 439 break; 440 } 441 *((u_int32_t *)resp->data) = priv->ifp->if_index; 442 break; 443 case NGM_ETHER_GET_ENADDR: 444 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 445 if (resp == NULL) { 446 error = ENOMEM; 447 break; 448 } 449 bcopy(IF_LLADDR(priv->ifp), 450 resp->data, ETHER_ADDR_LEN); 451 break; 452 case NGM_ETHER_SET_ENADDR: 453 { 454 if (msg->header.arglen != ETHER_ADDR_LEN) { 455 error = EINVAL; 456 break; 457 } 458 error = if_setlladdr(priv->ifp, 459 (u_char *)msg->data, ETHER_ADDR_LEN); 460 break; 461 } 462 case NGM_ETHER_GET_PROMISC: 463 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 464 if (resp == NULL) { 465 error = ENOMEM; 466 break; 467 } 468 *((u_int32_t *)resp->data) = priv->promisc; 469 break; 470 case NGM_ETHER_SET_PROMISC: 471 { 472 u_char want; 473 474 if (msg->header.arglen != sizeof(u_int32_t)) { 475 error = EINVAL; 476 break; 477 } 478 want = !!*((u_int32_t *)msg->data); 479 if (want ^ priv->promisc) { 480 if ((error = ifpromisc(priv->ifp, want)) != 0) 481 break; 482 priv->promisc = want; 483 } 484 break; 485 } 486 case NGM_ETHER_GET_AUTOSRC: 487 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 488 if (resp == NULL) { 489 error = ENOMEM; 490 break; 491 } 492 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 493 break; 494 case NGM_ETHER_SET_AUTOSRC: 495 if (msg->header.arglen != sizeof(u_int32_t)) { 496 error = EINVAL; 497 break; 498 } 499 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 500 break; 501 case NGM_ETHER_ADD_MULTI: 502 { 503 struct sockaddr_dl sa_dl; 504 struct ifmultiaddr *ifma; 505 506 if (msg->header.arglen != ETHER_ADDR_LEN) { 507 error = EINVAL; 508 break; 509 } 510 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 511 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 512 sa_dl.sdl_family = AF_LINK; 513 sa_dl.sdl_alen = ETHER_ADDR_LEN; 514 bcopy((void *)msg->data, LLADDR(&sa_dl), 515 ETHER_ADDR_LEN); 516 /* 517 * Netgraph is only permitted to join groups once 518 * via the if_addmulti() KPI, because it cannot hold 519 * struct ifmultiaddr * between calls. It may also 520 * lose a race while we check if the membership 521 * already exists. 522 */ 523 IF_ADDR_LOCK(priv->ifp); 524 ifma = if_findmulti(priv->ifp, 525 (struct sockaddr *)&sa_dl); 526 IF_ADDR_UNLOCK(priv->ifp); 527 if (ifma != NULL) { 528 error = EADDRINUSE; 529 } else { 530 error = if_addmulti(priv->ifp, 531 (struct sockaddr *)&sa_dl, &ifma); 532 } 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 */ 573 static int 574 ng_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 */ 596 static int 597 ng_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(IF_LLADDR(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 */ 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(ifp, m); 659 if (m == NULL) 660 return (0); 661 } 662 663 /* Route packet back in */ 664 ether_demux(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 FREE(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 int s; 736 737 s = splnet(); 738 switch (event) { 739 case MOD_LOAD: 740 741 /* Register function hooks */ 742 if (ng_ether_attach_p != NULL) { 743 error = EEXIST; 744 break; 745 } 746 ng_ether_attach_p = ng_ether_attach; 747 ng_ether_detach_p = ng_ether_detach; 748 ng_ether_output_p = ng_ether_output; 749 ng_ether_input_p = ng_ether_input; 750 ng_ether_input_orphan_p = ng_ether_input_orphan; 751 ng_ether_link_state_p = ng_ether_link_state; 752 753 /* Create nodes for any already-existing Ethernet interfaces */ 754 IFNET_RLOCK(); 755 TAILQ_FOREACH(ifp, &ifnet, if_link) { 756 if (ifp->if_type == IFT_ETHER 757 || ifp->if_type == IFT_L2VLAN) 758 ng_ether_attach(ifp); 759 } 760 IFNET_RUNLOCK(); 761 break; 762 763 case MOD_UNLOAD: 764 765 /* 766 * Note that the base code won't try to unload us until 767 * all nodes have been removed, and that can't happen 768 * until all Ethernet interfaces are removed. In any 769 * case, we know there are no nodes left if the action 770 * is MOD_UNLOAD, so there's no need to detach any nodes. 771 */ 772 773 /* Unregister function hooks */ 774 ng_ether_attach_p = NULL; 775 ng_ether_detach_p = NULL; 776 ng_ether_output_p = NULL; 777 ng_ether_input_p = NULL; 778 ng_ether_input_orphan_p = NULL; 779 ng_ether_link_state_p = NULL; 780 break; 781 782 default: 783 error = EOPNOTSUPP; 784 break; 785 } 786 splx(s); 787 return (error); 788 } 789
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