ng_ether.c revision 87599
1 2/* 3 * ng_ether.c 4 * 5 * Copyright (c) 1996-2000 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Authors: Archie Cobbs <archie@freebsd.org> 38 * Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD: head/sys/netgraph/ng_ether.c 87599 2001-12-10 08:09:49Z obrien $ 41 */ 42 43/* 44 * ng_ether(4) netgraph node type 45 */ 46 47#include <sys/param.h> 48#include <sys/systm.h> 49#include <sys/kernel.h> 50#include <sys/malloc.h> 51#include <sys/mbuf.h> 52#include <sys/errno.h> 53#include <sys/syslog.h> 54#include <sys/socket.h> 55 56#include <net/if.h> 57#include <net/if_types.h> 58#include <net/if_arp.h> 59#include <net/if_var.h> 60#include <net/ethernet.h> 61 62#include <netgraph/ng_message.h> 63#include <netgraph/netgraph.h> 64#include <netgraph/ng_parse.h> 65#include <netgraph/ng_ether.h> 66 67#define IFP2AC(IFP) ((struct arpcom *)IFP) 68#define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph) 69 70/* Per-node private data */ 71struct private { 72 struct ifnet *ifp; /* associated interface */ 73 hook_p upper; /* upper hook connection */ 74 hook_p lower; /* lower OR orphan hook connection */ 75 u_char lowerOrphan; /* whether lower is lower or orphan */ 76 u_char autoSrcAddr; /* always overwrite source address */ 77 u_char promisc; /* promiscuous mode enabled */ 78 u_int flags; /* flags e.g. really die */ 79}; 80typedef struct private *priv_p; 81 82/* Functional hooks called from if_ethersubr.c */ 83static void ng_ether_input(struct ifnet *ifp, 84 struct mbuf **mp, struct ether_header *eh); 85static void ng_ether_input_orphan(struct ifnet *ifp, 86 struct mbuf *m, struct ether_header *eh); 87static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 88static void ng_ether_attach(struct ifnet *ifp); 89static void ng_ether_detach(struct ifnet *ifp); 90 91/* Other functions */ 92static void ng_ether_input2(node_p node, 93 struct mbuf **mp, struct ether_header *eh); 94static int ng_ether_glueback_header(struct mbuf **mp, 95 struct ether_header *eh); 96static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta); 97static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta); 98 99/* Netgraph node methods */ 100static ng_constructor_t ng_ether_constructor; 101static ng_rcvmsg_t ng_ether_rcvmsg; 102static ng_shutdown_t ng_ether_shutdown; 103static ng_newhook_t ng_ether_newhook; 104static ng_connect_t ng_ether_connect; 105static ng_rcvdata_t ng_ether_rcvdata; 106static ng_disconnect_t ng_ether_disconnect; 107static int ng_ether_mod_event(module_t mod, int event, void *data); 108 109/* Parse type for an Ethernet address */ 110static ng_parse_t ng_enaddr_parse; 111static ng_unparse_t ng_enaddr_unparse; 112const struct ng_parse_type ng_ether_enaddr_type = { 113 NULL, 114 NULL, 115 NULL, 116 ng_enaddr_parse, 117 ng_enaddr_unparse, 118 NULL, /* no such thing as a "default" EN address */ 119 0 120}; 121 122/* List of commands and how to convert arguments to/from ASCII */ 123static const struct ng_cmdlist ng_ether_cmdlist[] = { 124 { 125 NGM_ETHER_COOKIE, 126 NGM_ETHER_GET_IFNAME, 127 "getifname", 128 NULL, 129 &ng_parse_string_type 130 }, 131 { 132 NGM_ETHER_COOKIE, 133 NGM_ETHER_GET_IFINDEX, 134 "getifindex", 135 NULL, 136 &ng_parse_int32_type 137 }, 138 { 139 NGM_ETHER_COOKIE, 140 NGM_ETHER_GET_ENADDR, 141 "getenaddr", 142 NULL, 143 &ng_ether_enaddr_type 144 }, 145 { 146 NGM_ETHER_COOKIE, 147 NGM_ETHER_SET_ENADDR, 148 "setenaddr", 149 &ng_ether_enaddr_type, 150 NULL 151 }, 152 { 153 NGM_ETHER_COOKIE, 154 NGM_ETHER_GET_PROMISC, 155 "getpromisc", 156 NULL, 157 &ng_parse_int32_type 158 }, 159 { 160 NGM_ETHER_COOKIE, 161 NGM_ETHER_SET_PROMISC, 162 "setpromisc", 163 &ng_parse_int32_type, 164 NULL 165 }, 166 { 167 NGM_ETHER_COOKIE, 168 NGM_ETHER_GET_AUTOSRC, 169 "getautosrc", 170 NULL, 171 &ng_parse_int32_type 172 }, 173 { 174 NGM_ETHER_COOKIE, 175 NGM_ETHER_SET_AUTOSRC, 176 "setautosrc", 177 &ng_parse_int32_type, 178 NULL 179 }, 180 { 0 } 181}; 182 183static struct ng_type ng_ether_typestruct = { 184 NG_ABI_VERSION, 185 NG_ETHER_NODE_TYPE, 186 ng_ether_mod_event, 187 ng_ether_constructor, 188 ng_ether_rcvmsg, 189 ng_ether_shutdown, 190 ng_ether_newhook, 191 NULL, 192 ng_ether_connect, 193 ng_ether_rcvdata, 194 ng_ether_disconnect, 195 ng_ether_cmdlist, 196}; 197MODULE_VERSION(ng_ether, 1); 198NETGRAPH_INIT(ether, &ng_ether_typestruct); 199 200/****************************************************************** 201 ETHERNET FUNCTION HOOKS 202******************************************************************/ 203 204/* 205 * Handle a packet that has come in on an interface. We get to 206 * look at it here before any upper layer protocols do. 207 * 208 * NOTE: this function will get called at splimp() 209 */ 210static void 211ng_ether_input(struct ifnet *ifp, 212 struct mbuf **mp, struct ether_header *eh) 213{ 214 const node_p node = IFP2NG(ifp); 215 const priv_p priv = NG_NODE_PRIVATE(node); 216 217 /* If "lower" hook not connected, let packet continue */ 218 if (priv->lower == NULL || priv->lowerOrphan) 219 return; 220 ng_ether_input2(node, mp, eh); 221} 222 223/* 224 * Handle a packet that has come in on an interface, and which 225 * does not match any of our known protocols (an ``orphan''). 226 * 227 * NOTE: this function will get called at splimp() 228 */ 229static void 230ng_ether_input_orphan(struct ifnet *ifp, 231 struct mbuf *m, struct ether_header *eh) 232{ 233 const node_p node = IFP2NG(ifp); 234 const priv_p priv = NG_NODE_PRIVATE(node); 235 236 /* If "orphan" hook not connected, let packet continue */ 237 if (priv->lower == NULL || !priv->lowerOrphan) { 238 m_freem(m); 239 return; 240 } 241 ng_ether_input2(node, &m, eh); 242 if (m != NULL) 243 m_freem(m); 244} 245 246/* 247 * Handle a packet that has come in on an ethernet interface. 248 * The Ethernet header has already been detached from the mbuf, 249 * so we have to put it back. 250 * 251 * NOTE: this function will get called at splimp() 252 */ 253static void 254ng_ether_input2(node_p node, struct mbuf **mp, struct ether_header *eh) 255{ 256 const priv_p priv = NG_NODE_PRIVATE(node); 257 int error; 258 259 /* Glue Ethernet header back on */ 260 if ((error = ng_ether_glueback_header(mp, eh)) != 0) 261 return; 262 263 /* Send out lower/orphan hook */ 264 NG_SEND_DATA_ONLY(error, priv->lower, *mp); 265 *mp = NULL; 266} 267 268/* 269 * Handle a packet that is going out on an interface. 270 * The Ethernet header is already attached to the mbuf. 271 */ 272static int 273ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 274{ 275 const node_p node = IFP2NG(ifp); 276 const priv_p priv = NG_NODE_PRIVATE(node); 277 int error = 0; 278 279 /* If "upper" hook not connected, let packet continue */ 280 if (priv->upper == NULL) 281 return (0); 282 283 /* Send it out "upper" hook */ 284 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 285 return (error); 286} 287 288/* 289 * A new Ethernet interface has been attached. 290 * Create a new node for it, etc. 291 */ 292static void 293ng_ether_attach(struct ifnet *ifp) 294{ 295 char name[IFNAMSIZ + 1]; 296 priv_p priv; 297 node_p node; 298 299 /* Create node */ 300 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 301 snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit); 302 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 303 log(LOG_ERR, "%s: can't %s for %s\n", 304 __func__, "create node", name); 305 return; 306 } 307 308 /* Allocate private data */ 309 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 310 if (priv == NULL) { 311 log(LOG_ERR, "%s: can't %s for %s\n", 312 __func__, "allocate memory", name); 313 NG_NODE_UNREF(node); 314 return; 315 } 316 NG_NODE_SET_PRIVATE(node, priv); 317 priv->ifp = ifp; 318 IFP2NG(ifp) = node; 319 priv->autoSrcAddr = 1; 320 321 /* Try to give the node the same name as the interface */ 322 if (ng_name_node(node, name) != 0) { 323 log(LOG_WARNING, "%s: can't name node %s\n", 324 __func__, name); 325 } 326} 327 328/* 329 * An Ethernet interface is being detached. 330 * REALLY Destroy its node. 331 */ 332static void 333ng_ether_detach(struct ifnet *ifp) 334{ 335 const node_p node = IFP2NG(ifp); 336 const priv_p priv = NG_NODE_PRIVATE(node); 337 338 if (node == NULL) /* no node (why not?), ignore */ 339 return; 340 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 341 /* 342 * We can't assume the ifnet is still around when we run shutdown 343 * So zap it now. XXX We HOPE that anything running at this time 344 * handles it (as it should in the non netgraph case). 345 */ 346 IFP2NG(ifp) = NULL; 347 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 348 ng_rmnode_self(node); /* remove all netgraph parts */ 349} 350 351/* 352 * Optimization for gluing the Ethernet header back onto 353 * the front of an incoming packet. 354 */ 355static int 356ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh) 357{ 358 struct mbuf *m = *mp; 359 uintfptr_t room; 360 int error = 0; 361 362 /* 363 * Possibly the header is already on the front. 364 * If this is the case so just move the markers back 365 * to re-include it. We lucked out. 366 * This allows us to avoid a yucky m_pullup 367 * in later nodes if it works. 368 */ 369 if (eh == mtod(m, struct ether_header *) - 1) { 370 m->m_len += sizeof(*eh); 371 m->m_data -= sizeof(*eh); 372 m->m_pkthdr.len += sizeof(*eh); 373 goto done; 374 } 375 376 /* 377 * Alternatively there may be room even though 378 * it is stored somewhere else. If so, copy it in. 379 * This only safe because we KNOW that this packet has 380 * just been generated by an ethernet card, so there are 381 * no aliases to the buffer (not so for outgoing packets). 382 * Nearly all ethernet cards will end up producing mbufs 383 * that fall into these cases. So we are not optimizing 384 * contorted cases. 385 */ 386 if ((m->m_flags & M_EXT) != 0) { 387 room = mtod(m, caddr_t) - m->m_ext.ext_buf; 388 if (room > m->m_ext.ext_size) /* garbage, fail immediately */ 389 room = 0; 390 } else 391 room = mtod(m, caddr_t) - m->m_pktdat; 392 393 /* 394 * If we have room, just copy it and adjust 395 */ 396 if (room >= sizeof(*eh)) { 397 m->m_len += sizeof(*eh); 398 m->m_data -= sizeof(*eh); 399 m->m_pkthdr.len += sizeof(*eh); 400 goto copy; 401 } 402 403 /* 404 * Doing anything more is likely to get more 405 * expensive than it's worth.. 406 * it's probable that everything else is in one 407 * big lump. The next node will do an m_pullup() 408 * for exactly the amount of data it needs and 409 * hopefully everything after that will not 410 * need one. So let's just use M_PREPEND. 411 */ 412 M_PREPEND(m, sizeof (*eh), M_DONTWAIT); 413 if (m == NULL) { 414 error = ENOBUFS; 415 goto done; 416 } 417 418copy: 419 /* Copy header and return (possibly new) mbuf */ 420 bcopy((caddr_t)eh, mtod(m, struct ether_header *), sizeof(*eh)); 421done: 422 *mp = m; 423 return error; 424} 425 426/****************************************************************** 427 NETGRAPH NODE METHODS 428******************************************************************/ 429 430/* 431 * It is not possible or allowable to create a node of this type. 432 * Nodes get created when the interface is attached (or, when 433 * this node type's KLD is loaded). 434 */ 435static int 436ng_ether_constructor(node_p node) 437{ 438 return (EINVAL); 439} 440 441/* 442 * Check for attaching a new hook. 443 */ 444static int 445ng_ether_newhook(node_p node, hook_p hook, const char *name) 446{ 447 const priv_p priv = NG_NODE_PRIVATE(node); 448 u_char orphan = priv->lowerOrphan; 449 hook_p *hookptr; 450 451 /* Divert hook is an alias for lower */ 452 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 453 name = NG_ETHER_HOOK_LOWER; 454 455 /* Which hook? */ 456 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 457 hookptr = &priv->upper; 458 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 459 hookptr = &priv->lower; 460 orphan = 0; 461 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 462 hookptr = &priv->lower; 463 orphan = 1; 464 } else 465 return (EINVAL); 466 467 /* Check if already connected (shouldn't be, but doesn't hurt) */ 468 if (*hookptr != NULL) 469 return (EISCONN); 470 471 /* OK */ 472 *hookptr = hook; 473 priv->lowerOrphan = orphan; 474 return (0); 475} 476 477/* 478 * Hooks are attached, adjust to force queueing. 479 * We don't really care which hook it is. 480 * they should all be queuing for outgoing data. 481 */ 482static int 483ng_ether_connect(hook_p hook) 484{ 485 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); 486 return (0); 487} 488 489/* 490 * Receive an incoming control message. 491 */ 492static int 493ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 494{ 495 const priv_p priv = NG_NODE_PRIVATE(node); 496 struct ng_mesg *resp = NULL; 497 int error = 0; 498 struct ng_mesg *msg; 499 500 NGI_GET_MSG(item, msg); 501 switch (msg->header.typecookie) { 502 case NGM_ETHER_COOKIE: 503 switch (msg->header.cmd) { 504 case NGM_ETHER_GET_IFNAME: 505 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT); 506 if (resp == NULL) { 507 error = ENOMEM; 508 break; 509 } 510 snprintf(resp->data, IFNAMSIZ + 1, 511 "%s%d", priv->ifp->if_name, priv->ifp->if_unit); 512 break; 513 case NGM_ETHER_GET_IFINDEX: 514 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 515 if (resp == NULL) { 516 error = ENOMEM; 517 break; 518 } 519 *((u_int32_t *)resp->data) = priv->ifp->if_index; 520 break; 521 case NGM_ETHER_GET_ENADDR: 522 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 523 if (resp == NULL) { 524 error = ENOMEM; 525 break; 526 } 527 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 528 resp->data, ETHER_ADDR_LEN); 529 break; 530 case NGM_ETHER_SET_ENADDR: 531 { 532 if (msg->header.arglen != ETHER_ADDR_LEN) { 533 error = EINVAL; 534 break; 535 } 536 error = if_setlladdr(priv->ifp, 537 (u_char *)msg->data, ETHER_ADDR_LEN); 538 break; 539 } 540 case NGM_ETHER_GET_PROMISC: 541 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 542 if (resp == NULL) { 543 error = ENOMEM; 544 break; 545 } 546 *((u_int32_t *)resp->data) = priv->promisc; 547 break; 548 case NGM_ETHER_SET_PROMISC: 549 { 550 u_char want; 551 552 if (msg->header.arglen != sizeof(u_int32_t)) { 553 error = EINVAL; 554 break; 555 } 556 want = !!*((u_int32_t *)msg->data); 557 if (want ^ priv->promisc) { 558 if ((error = ifpromisc(priv->ifp, want)) != 0) 559 break; 560 priv->promisc = want; 561 } 562 break; 563 } 564 case NGM_ETHER_GET_AUTOSRC: 565 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 566 if (resp == NULL) { 567 error = ENOMEM; 568 break; 569 } 570 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 571 break; 572 case NGM_ETHER_SET_AUTOSRC: 573 if (msg->header.arglen != sizeof(u_int32_t)) { 574 error = EINVAL; 575 break; 576 } 577 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 578 break; 579 default: 580 error = EINVAL; 581 break; 582 } 583 break; 584 default: 585 error = EINVAL; 586 break; 587 } 588 NG_RESPOND_MSG(error, node, item, resp); 589 NG_FREE_MSG(msg); 590 return (error); 591} 592 593/* 594 * Receive data on a hook. 595 */ 596static int 597ng_ether_rcvdata(hook_p hook, item_p item) 598{ 599 const node_p node = NG_HOOK_NODE(hook); 600 const priv_p priv = NG_NODE_PRIVATE(node); 601 struct mbuf *m; 602 meta_p meta; 603 604 NGI_GET_M(item, m); 605 NGI_GET_META(item, meta); 606 NG_FREE_ITEM(item); 607 if (hook == priv->lower) 608 return ng_ether_rcv_lower(node, m, meta); 609 if (hook == priv->upper) 610 return ng_ether_rcv_upper(node, m, meta); 611 panic("%s: weird hook", __func__); 612#ifdef RESTARTABLE_PANICS /* so we don;t get an error msg in LINT */ 613 return NULL; 614#endif 615} 616 617/* 618 * Handle an mbuf received on the "lower" hook. 619 */ 620static int 621ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta) 622{ 623 const priv_p priv = NG_NODE_PRIVATE(node); 624 625 /* Make sure header is fully pulled up */ 626 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 627 NG_FREE_M(m); 628 NG_FREE_META(meta); 629 return (EINVAL); 630 } 631 if (m->m_len < sizeof(struct ether_header) 632 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 633 NG_FREE_META(meta); 634 return (ENOBUFS); 635 } 636 637 /* Drop in the MAC address if desired */ 638 if (priv->autoSrcAddr) { 639 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 640 mtod(m, struct ether_header *)->ether_shost, 641 ETHER_ADDR_LEN); 642 } 643 644 /* Send it on its way */ 645 NG_FREE_META(meta); 646 return ether_output_frame(priv->ifp, m); 647} 648 649/* 650 * Handle an mbuf received on the "upper" hook. 651 */ 652static int 653ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta) 654{ 655 const priv_p priv = NG_NODE_PRIVATE(node); 656 struct ether_header *eh; 657 658 /* Check length and pull off header */ 659 if (m->m_pkthdr.len < sizeof(*eh)) { 660 NG_FREE_M(m); 661 NG_FREE_META(meta); 662 return (EINVAL); 663 } 664 if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL) { 665 NG_FREE_META(meta); 666 return (ENOBUFS); 667 } 668 eh = mtod(m, struct ether_header *); 669 m->m_data += sizeof(*eh); 670 m->m_len -= sizeof(*eh); 671 m->m_pkthdr.len -= sizeof(*eh); 672 m->m_pkthdr.rcvif = priv->ifp; 673 674 /* Route packet back in */ 675 NG_FREE_META(meta); 676 ether_demux(priv->ifp, eh, m); 677 return (0); 678} 679 680/* 681 * Shutdown node. This resets the node but does not remove it 682 * unless the REALLY_DIE flag is set. 683 */ 684static int 685ng_ether_shutdown(node_p node) 686{ 687 const priv_p priv = NG_NODE_PRIVATE(node); 688 689 if (priv->promisc) { /* disable promiscuous mode */ 690 (void)ifpromisc(priv->ifp, 0); 691 priv->promisc = 0; 692 } 693 if (node->nd_flags & NG_REALLY_DIE) { 694 /* 695 * WE came here because the ethernet card is being unloaded, 696 * so stop being persistant. 697 * Actually undo all the things we did on creation. 698 * Assume the ifp has already been freed. 699 */ 700 NG_NODE_SET_PRIVATE(node, NULL); 701 FREE(priv, M_NETGRAPH); 702 NG_NODE_UNREF(node); /* free node itself */ 703 return (0); 704 } 705 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 706 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */ 707 return (0); 708} 709 710/* 711 * Hook disconnection. 712 */ 713static int 714ng_ether_disconnect(hook_p hook) 715{ 716 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 717 718 if (hook == priv->upper) 719 priv->upper = NULL; 720 else if (hook == priv->lower) { 721 priv->lower = NULL; 722 priv->lowerOrphan = 0; 723 } else 724 panic("%s: weird hook", __func__); 725 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 726 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 727 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 728 return (0); 729} 730 731static int 732ng_enaddr_parse(const struct ng_parse_type *type, 733 const char *s, int *const off, const u_char *const start, 734 u_char *const buf, int *const buflen) 735{ 736 char *eptr; 737 u_long val; 738 int i; 739 740 if (*buflen < ETHER_ADDR_LEN) 741 return (ERANGE); 742 for (i = 0; i < ETHER_ADDR_LEN; i++) { 743 val = strtoul(s + *off, &eptr, 16); 744 if (val > 0xff || eptr == s + *off) 745 return (EINVAL); 746 buf[i] = (u_char)val; 747 *off = (eptr - s); 748 if (i < ETHER_ADDR_LEN - 1) { 749 if (*eptr != ':') 750 return (EINVAL); 751 (*off)++; 752 } 753 } 754 *buflen = ETHER_ADDR_LEN; 755 return (0); 756} 757 758static int 759ng_enaddr_unparse(const struct ng_parse_type *type, 760 const u_char *data, int *off, char *cbuf, int cbuflen) 761{ 762 int len; 763 764 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x", 765 data[*off], data[*off + 1], data[*off + 2], 766 data[*off + 3], data[*off + 4], data[*off + 5]); 767 if (len >= cbuflen) 768 return (ERANGE); 769 *off += ETHER_ADDR_LEN; 770 return (0); 771} 772 773/****************************************************************** 774 INITIALIZATION 775******************************************************************/ 776 777/* 778 * Handle loading and unloading for this node type. 779 */ 780static int 781ng_ether_mod_event(module_t mod, int event, void *data) 782{ 783 struct ifnet *ifp; 784 int error = 0; 785 int s; 786 787 s = splnet(); 788 switch (event) { 789 case MOD_LOAD: 790 791 /* Register function hooks */ 792 if (ng_ether_attach_p != NULL) { 793 error = EEXIST; 794 break; 795 } 796 ng_ether_attach_p = ng_ether_attach; 797 ng_ether_detach_p = ng_ether_detach; 798 ng_ether_output_p = ng_ether_output; 799 ng_ether_input_p = ng_ether_input; 800 ng_ether_input_orphan_p = ng_ether_input_orphan; 801 802 /* Create nodes for any already-existing Ethernet interfaces */ 803 TAILQ_FOREACH(ifp, &ifnet, if_link) { 804 if (ifp->if_type == IFT_ETHER 805 || ifp->if_type == IFT_L2VLAN) 806 ng_ether_attach(ifp); 807 } 808 break; 809 810 case MOD_UNLOAD: 811 812 /* 813 * Note that the base code won't try to unload us until 814 * all nodes have been removed, and that can't happen 815 * until all Ethernet interfaces are removed. In any 816 * case, we know there are no nodes left if the action 817 * is MOD_UNLOAD, so there's no need to detach any nodes. 818 */ 819 820 /* Unregister function hooks */ 821 ng_ether_attach_p = NULL; 822 ng_ether_detach_p = NULL; 823 ng_ether_output_p = NULL; 824 ng_ether_input_p = NULL; 825 ng_ether_input_orphan_p = NULL; 826 break; 827 828 default: 829 error = EOPNOTSUPP; 830 break; 831 } 832 splx(s); 833 return (error); 834} 835 836