ng_ether.c revision 96265
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 96265 2002-05-09 20:19:00Z archie $ 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_long hwassist; /* hardware checksum capabilities */ 79 u_int flags; /* flags e.g. really die */ 80}; 81typedef struct private *priv_p; 82 83/* Functional hooks called from if_ethersubr.c */ 84static void ng_ether_input(struct ifnet *ifp, 85 struct mbuf **mp, struct ether_header *eh); 86static void ng_ether_input_orphan(struct ifnet *ifp, 87 struct mbuf *m, struct ether_header *eh); 88static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 89static void ng_ether_attach(struct ifnet *ifp); 90static void ng_ether_detach(struct ifnet *ifp); 91 92/* Other functions */ 93static void ng_ether_input2(node_p node, 94 struct mbuf **mp, struct ether_header *eh); 95static int ng_ether_glueback_header(struct mbuf **mp, 96 struct ether_header *eh); 97static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta); 98static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta); 99 100/* Netgraph node methods */ 101static ng_constructor_t ng_ether_constructor; 102static ng_rcvmsg_t ng_ether_rcvmsg; 103static ng_shutdown_t ng_ether_shutdown; 104static ng_newhook_t ng_ether_newhook; 105static ng_connect_t ng_ether_connect; 106static ng_rcvdata_t ng_ether_rcvdata; 107static ng_disconnect_t ng_ether_disconnect; 108static int ng_ether_mod_event(module_t mod, int event, void *data); 109 110/* Parse type for an Ethernet address */ 111static ng_parse_t ng_enaddr_parse; 112static ng_unparse_t ng_enaddr_unparse; 113const struct ng_parse_type ng_ether_enaddr_type = { 114 NULL, 115 NULL, 116 NULL, 117 ng_enaddr_parse, 118 ng_enaddr_unparse, 119 NULL, /* no such thing as a "default" EN address */ 120 0 121}; 122 123/* List of commands and how to convert arguments to/from ASCII */ 124static const struct ng_cmdlist ng_ether_cmdlist[] = { 125 { 126 NGM_ETHER_COOKIE, 127 NGM_ETHER_GET_IFNAME, 128 "getifname", 129 NULL, 130 &ng_parse_string_type 131 }, 132 { 133 NGM_ETHER_COOKIE, 134 NGM_ETHER_GET_IFINDEX, 135 "getifindex", 136 NULL, 137 &ng_parse_int32_type 138 }, 139 { 140 NGM_ETHER_COOKIE, 141 NGM_ETHER_GET_ENADDR, 142 "getenaddr", 143 NULL, 144 &ng_ether_enaddr_type 145 }, 146 { 147 NGM_ETHER_COOKIE, 148 NGM_ETHER_SET_ENADDR, 149 "setenaddr", 150 &ng_ether_enaddr_type, 151 NULL 152 }, 153 { 154 NGM_ETHER_COOKIE, 155 NGM_ETHER_GET_PROMISC, 156 "getpromisc", 157 NULL, 158 &ng_parse_int32_type 159 }, 160 { 161 NGM_ETHER_COOKIE, 162 NGM_ETHER_SET_PROMISC, 163 "setpromisc", 164 &ng_parse_int32_type, 165 NULL 166 }, 167 { 168 NGM_ETHER_COOKIE, 169 NGM_ETHER_GET_AUTOSRC, 170 "getautosrc", 171 NULL, 172 &ng_parse_int32_type 173 }, 174 { 175 NGM_ETHER_COOKIE, 176 NGM_ETHER_SET_AUTOSRC, 177 "setautosrc", 178 &ng_parse_int32_type, 179 NULL 180 }, 181 { 0 } 182}; 183 184static struct ng_type ng_ether_typestruct = { 185 NG_ABI_VERSION, 186 NG_ETHER_NODE_TYPE, 187 ng_ether_mod_event, 188 ng_ether_constructor, 189 ng_ether_rcvmsg, 190 ng_ether_shutdown, 191 ng_ether_newhook, 192 NULL, 193 ng_ether_connect, 194 ng_ether_rcvdata, 195 ng_ether_disconnect, 196 ng_ether_cmdlist, 197}; 198MODULE_VERSION(ng_ether, 1); 199NETGRAPH_INIT(ether, &ng_ether_typestruct); 200 201/****************************************************************** 202 ETHERNET FUNCTION HOOKS 203******************************************************************/ 204 205/* 206 * Handle a packet that has come in on an interface. We get to 207 * look at it here before any upper layer protocols do. 208 * 209 * NOTE: this function will get called at splimp() 210 */ 211static void 212ng_ether_input(struct ifnet *ifp, 213 struct mbuf **mp, struct ether_header *eh) 214{ 215 const node_p node = IFP2NG(ifp); 216 const priv_p priv = NG_NODE_PRIVATE(node); 217 218 /* If "lower" hook not connected, let packet continue */ 219 if (priv->lower == NULL || priv->lowerOrphan) 220 return; 221 ng_ether_input2(node, mp, eh); 222} 223 224/* 225 * Handle a packet that has come in on an interface, and which 226 * does not match any of our known protocols (an ``orphan''). 227 * 228 * NOTE: this function will get called at splimp() 229 */ 230static void 231ng_ether_input_orphan(struct ifnet *ifp, 232 struct mbuf *m, struct ether_header *eh) 233{ 234 const node_p node = IFP2NG(ifp); 235 const priv_p priv = NG_NODE_PRIVATE(node); 236 237 /* If "orphan" hook not connected, let packet continue */ 238 if (priv->lower == NULL || !priv->lowerOrphan) { 239 m_freem(m); 240 return; 241 } 242 ng_ether_input2(node, &m, eh); 243 if (m != NULL) 244 m_freem(m); 245} 246 247/* 248 * Handle a packet that has come in on an ethernet interface. 249 * The Ethernet header has already been detached from the mbuf, 250 * so we have to put it back. 251 * 252 * NOTE: this function will get called at splimp() 253 */ 254static void 255ng_ether_input2(node_p node, struct mbuf **mp, struct ether_header *eh) 256{ 257 const priv_p priv = NG_NODE_PRIVATE(node); 258 int error; 259 260 /* Glue Ethernet header back on */ 261 if ((error = ng_ether_glueback_header(mp, eh)) != 0) 262 return; 263 264 /* Send out lower/orphan hook */ 265 NG_SEND_DATA_ONLY(error, priv->lower, *mp); 266 *mp = NULL; 267} 268 269/* 270 * Handle a packet that is going out on an interface. 271 * The Ethernet header is already attached to the mbuf. 272 */ 273static int 274ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 275{ 276 const node_p node = IFP2NG(ifp); 277 const priv_p priv = NG_NODE_PRIVATE(node); 278 int error = 0; 279 280 /* If "upper" hook not connected, let packet continue */ 281 if (priv->upper == NULL) 282 return (0); 283 284 /* Send it out "upper" hook */ 285 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 286 return (error); 287} 288 289/* 290 * A new Ethernet interface has been attached. 291 * Create a new node for it, etc. 292 */ 293static void 294ng_ether_attach(struct ifnet *ifp) 295{ 296 char name[IFNAMSIZ + 1]; 297 priv_p priv; 298 node_p node; 299 300 /* Create node */ 301 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 302 snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit); 303 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 304 log(LOG_ERR, "%s: can't %s for %s\n", 305 __func__, "create node", name); 306 return; 307 } 308 309 /* Allocate private data */ 310 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 311 if (priv == NULL) { 312 log(LOG_ERR, "%s: can't %s for %s\n", 313 __func__, "allocate memory", name); 314 NG_NODE_UNREF(node); 315 return; 316 } 317 NG_NODE_SET_PRIVATE(node, priv); 318 priv->ifp = ifp; 319 IFP2NG(ifp) = node; 320 priv->autoSrcAddr = 1; 321 priv->hwassist = ifp->if_hwassist; 322 323 /* Try to give the node the same name as the interface */ 324 if (ng_name_node(node, name) != 0) { 325 log(LOG_WARNING, "%s: can't name node %s\n", 326 __func__, name); 327 } 328} 329 330/* 331 * An Ethernet interface is being detached. 332 * REALLY Destroy its node. 333 */ 334static void 335ng_ether_detach(struct ifnet *ifp) 336{ 337 const node_p node = IFP2NG(ifp); 338 const priv_p priv = NG_NODE_PRIVATE(node); 339 340 if (node == NULL) /* no node (why not?), ignore */ 341 return; 342 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 343 /* 344 * We can't assume the ifnet is still around when we run shutdown 345 * So zap it now. XXX We HOPE that anything running at this time 346 * handles it (as it should in the non netgraph case). 347 */ 348 IFP2NG(ifp) = NULL; 349 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 350 ng_rmnode_self(node); /* remove all netgraph parts */ 351} 352 353/* 354 * Optimization for gluing the Ethernet header back onto 355 * the front of an incoming packet. 356 */ 357static int 358ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh) 359{ 360 struct mbuf *m = *mp; 361 uintfptr_t room; 362 int error = 0; 363 364 /* 365 * Possibly the header is already on the front. 366 * If this is the case so just move the markers back 367 * to re-include it. We lucked out. 368 * This allows us to avoid a yucky m_pullup 369 * in later nodes if it works. 370 */ 371 if (eh == mtod(m, struct ether_header *) - 1) { 372 m->m_len += sizeof(*eh); 373 m->m_data -= sizeof(*eh); 374 m->m_pkthdr.len += sizeof(*eh); 375 goto done; 376 } 377 378 /* 379 * Alternatively there may be room even though 380 * it is stored somewhere else. If so, copy it in. 381 * This only safe because we KNOW that this packet has 382 * just been generated by an ethernet card, so there are 383 * no aliases to the buffer (not so for outgoing packets). 384 * Nearly all ethernet cards will end up producing mbufs 385 * that fall into these cases. So we are not optimizing 386 * contorted cases. 387 */ 388 if ((m->m_flags & M_EXT) != 0) { 389 room = mtod(m, caddr_t) - m->m_ext.ext_buf; 390 if (room > m->m_ext.ext_size) /* garbage, fail immediately */ 391 room = 0; 392 } else 393 room = mtod(m, caddr_t) - m->m_pktdat; 394 395 /* 396 * If we have room, just copy it and adjust 397 */ 398 if (room >= sizeof(*eh)) { 399 m->m_len += sizeof(*eh); 400 m->m_data -= sizeof(*eh); 401 m->m_pkthdr.len += sizeof(*eh); 402 goto copy; 403 } 404 405 /* 406 * Doing anything more is likely to get more 407 * expensive than it's worth.. 408 * it's probable that everything else is in one 409 * big lump. The next node will do an m_pullup() 410 * for exactly the amount of data it needs and 411 * hopefully everything after that will not 412 * need one. So let's just use M_PREPEND. 413 */ 414 M_PREPEND(m, sizeof (*eh), M_DONTWAIT); 415 if (m == NULL) { 416 error = ENOBUFS; 417 goto done; 418 } 419 420copy: 421 /* Copy header and return (possibly new) mbuf */ 422 bcopy((caddr_t)eh, mtod(m, struct ether_header *), sizeof(*eh)); 423done: 424 *mp = m; 425 return error; 426} 427 428/****************************************************************** 429 NETGRAPH NODE METHODS 430******************************************************************/ 431 432/* 433 * It is not possible or allowable to create a node of this type. 434 * Nodes get created when the interface is attached (or, when 435 * this node type's KLD is loaded). 436 */ 437static int 438ng_ether_constructor(node_p node) 439{ 440 return (EINVAL); 441} 442 443/* 444 * Check for attaching a new hook. 445 */ 446static int 447ng_ether_newhook(node_p node, hook_p hook, const char *name) 448{ 449 const priv_p priv = NG_NODE_PRIVATE(node); 450 u_char orphan = priv->lowerOrphan; 451 hook_p *hookptr; 452 453 /* Divert hook is an alias for lower */ 454 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 455 name = NG_ETHER_HOOK_LOWER; 456 457 /* Which hook? */ 458 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 459 hookptr = &priv->upper; 460 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 461 hookptr = &priv->lower; 462 orphan = 0; 463 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 464 hookptr = &priv->lower; 465 orphan = 1; 466 } else 467 return (EINVAL); 468 469 /* Check if already connected (shouldn't be, but doesn't hurt) */ 470 if (*hookptr != NULL) 471 return (EISCONN); 472 473 /* Disable hardware checksums while 'upper' hook is connected */ 474 if (hookptr == &priv->upper) 475 priv->ifp->if_hwassist = 0; 476 477 /* OK */ 478 *hookptr = hook; 479 priv->lowerOrphan = orphan; 480 return (0); 481} 482 483/* 484 * Hooks are attached, adjust to force queueing. 485 * We don't really care which hook it is. 486 * they should all be queuing for outgoing data. 487 */ 488static int 489ng_ether_connect(hook_p hook) 490{ 491 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); 492 return (0); 493} 494 495/* 496 * Receive an incoming control message. 497 */ 498static int 499ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 500{ 501 const priv_p priv = NG_NODE_PRIVATE(node); 502 struct ng_mesg *resp = NULL; 503 int error = 0; 504 struct ng_mesg *msg; 505 506 NGI_GET_MSG(item, msg); 507 switch (msg->header.typecookie) { 508 case NGM_ETHER_COOKIE: 509 switch (msg->header.cmd) { 510 case NGM_ETHER_GET_IFNAME: 511 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT); 512 if (resp == NULL) { 513 error = ENOMEM; 514 break; 515 } 516 snprintf(resp->data, IFNAMSIZ + 1, 517 "%s%d", priv->ifp->if_name, priv->ifp->if_unit); 518 break; 519 case NGM_ETHER_GET_IFINDEX: 520 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 521 if (resp == NULL) { 522 error = ENOMEM; 523 break; 524 } 525 *((u_int32_t *)resp->data) = priv->ifp->if_index; 526 break; 527 case NGM_ETHER_GET_ENADDR: 528 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 529 if (resp == NULL) { 530 error = ENOMEM; 531 break; 532 } 533 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 534 resp->data, ETHER_ADDR_LEN); 535 break; 536 case NGM_ETHER_SET_ENADDR: 537 { 538 if (msg->header.arglen != ETHER_ADDR_LEN) { 539 error = EINVAL; 540 break; 541 } 542 error = if_setlladdr(priv->ifp, 543 (u_char *)msg->data, ETHER_ADDR_LEN); 544 break; 545 } 546 case NGM_ETHER_GET_PROMISC: 547 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 548 if (resp == NULL) { 549 error = ENOMEM; 550 break; 551 } 552 *((u_int32_t *)resp->data) = priv->promisc; 553 break; 554 case NGM_ETHER_SET_PROMISC: 555 { 556 u_char want; 557 558 if (msg->header.arglen != sizeof(u_int32_t)) { 559 error = EINVAL; 560 break; 561 } 562 want = !!*((u_int32_t *)msg->data); 563 if (want ^ priv->promisc) { 564 if ((error = ifpromisc(priv->ifp, want)) != 0) 565 break; 566 priv->promisc = want; 567 } 568 break; 569 } 570 case NGM_ETHER_GET_AUTOSRC: 571 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 572 if (resp == NULL) { 573 error = ENOMEM; 574 break; 575 } 576 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 577 break; 578 case NGM_ETHER_SET_AUTOSRC: 579 if (msg->header.arglen != sizeof(u_int32_t)) { 580 error = EINVAL; 581 break; 582 } 583 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 584 break; 585 default: 586 error = EINVAL; 587 break; 588 } 589 break; 590 default: 591 error = EINVAL; 592 break; 593 } 594 NG_RESPOND_MSG(error, node, item, resp); 595 NG_FREE_MSG(msg); 596 return (error); 597} 598 599/* 600 * Receive data on a hook. 601 */ 602static int 603ng_ether_rcvdata(hook_p hook, item_p item) 604{ 605 const node_p node = NG_HOOK_NODE(hook); 606 const priv_p priv = NG_NODE_PRIVATE(node); 607 struct mbuf *m; 608 meta_p meta; 609 610 NGI_GET_M(item, m); 611 NGI_GET_META(item, meta); 612 NG_FREE_ITEM(item); 613 if (hook == priv->lower) 614 return ng_ether_rcv_lower(node, m, meta); 615 if (hook == priv->upper) 616 return ng_ether_rcv_upper(node, m, meta); 617 panic("%s: weird hook", __func__); 618#ifdef RESTARTABLE_PANICS /* so we don;t get an error msg in LINT */ 619 return NULL; 620#endif 621} 622 623/* 624 * Handle an mbuf received on the "lower" hook. 625 */ 626static int 627ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta) 628{ 629 const priv_p priv = NG_NODE_PRIVATE(node); 630 struct ifnet *const ifp = priv->ifp; 631 632 /* Check whether interface is ready for packets */ 633 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 634 NG_FREE_M(m); 635 NG_FREE_META(meta); 636 return (ENETDOWN); 637 } 638 639 /* Make sure header is fully pulled up */ 640 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 641 NG_FREE_M(m); 642 NG_FREE_META(meta); 643 return (EINVAL); 644 } 645 if (m->m_len < sizeof(struct ether_header) 646 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 647 NG_FREE_META(meta); 648 return (ENOBUFS); 649 } 650 651 /* Drop in the MAC address if desired */ 652 if (priv->autoSrcAddr) { 653 bcopy((IFP2AC(ifp))->ac_enaddr, 654 mtod(m, struct ether_header *)->ether_shost, 655 ETHER_ADDR_LEN); 656 } 657 658 /* Send it on its way */ 659 NG_FREE_META(meta); 660 return ether_output_frame(ifp, m); 661} 662 663/* 664 * Handle an mbuf received on the "upper" hook. 665 */ 666static int 667ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta) 668{ 669 const priv_p priv = NG_NODE_PRIVATE(node); 670 struct ether_header *eh; 671 672 /* Check length and pull off header */ 673 if (m->m_pkthdr.len < sizeof(*eh)) { 674 NG_FREE_M(m); 675 NG_FREE_META(meta); 676 return (EINVAL); 677 } 678 if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL) { 679 NG_FREE_META(meta); 680 return (ENOBUFS); 681 } 682 eh = mtod(m, struct ether_header *); 683 m->m_data += sizeof(*eh); 684 m->m_len -= sizeof(*eh); 685 m->m_pkthdr.len -= sizeof(*eh); 686 m->m_pkthdr.rcvif = priv->ifp; 687 688 /* Route packet back in */ 689 NG_FREE_META(meta); 690 ether_demux(priv->ifp, eh, m); 691 return (0); 692} 693 694/* 695 * Shutdown node. This resets the node but does not remove it 696 * unless the REALLY_DIE flag is set. 697 */ 698static int 699ng_ether_shutdown(node_p node) 700{ 701 const priv_p priv = NG_NODE_PRIVATE(node); 702 703 if (priv->promisc) { /* disable promiscuous mode */ 704 (void)ifpromisc(priv->ifp, 0); 705 priv->promisc = 0; 706 } 707 if (node->nd_flags & NG_REALLY_DIE) { 708 /* 709 * WE came here because the ethernet card is being unloaded, 710 * so stop being persistant. 711 * Actually undo all the things we did on creation. 712 * Assume the ifp has already been freed. 713 */ 714 NG_NODE_SET_PRIVATE(node, NULL); 715 FREE(priv, M_NETGRAPH); 716 NG_NODE_UNREF(node); /* free node itself */ 717 return (0); 718 } 719 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 720 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */ 721 return (0); 722} 723 724/* 725 * Hook disconnection. 726 */ 727static int 728ng_ether_disconnect(hook_p hook) 729{ 730 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 731 732 if (hook == priv->upper) { 733 priv->upper = NULL; 734 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */ 735 } else if (hook == priv->lower) { 736 priv->lower = NULL; 737 priv->lowerOrphan = 0; 738 } else 739 panic("%s: weird hook", __func__); 740 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 741 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 742 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 743 return (0); 744} 745 746static int 747ng_enaddr_parse(const struct ng_parse_type *type, 748 const char *s, int *const off, const u_char *const start, 749 u_char *const buf, int *const buflen) 750{ 751 char *eptr; 752 u_long val; 753 int i; 754 755 if (*buflen < ETHER_ADDR_LEN) 756 return (ERANGE); 757 for (i = 0; i < ETHER_ADDR_LEN; i++) { 758 val = strtoul(s + *off, &eptr, 16); 759 if (val > 0xff || eptr == s + *off) 760 return (EINVAL); 761 buf[i] = (u_char)val; 762 *off = (eptr - s); 763 if (i < ETHER_ADDR_LEN - 1) { 764 if (*eptr != ':') 765 return (EINVAL); 766 (*off)++; 767 } 768 } 769 *buflen = ETHER_ADDR_LEN; 770 return (0); 771} 772 773static int 774ng_enaddr_unparse(const struct ng_parse_type *type, 775 const u_char *data, int *off, char *cbuf, int cbuflen) 776{ 777 int len; 778 779 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x", 780 data[*off], data[*off + 1], data[*off + 2], 781 data[*off + 3], data[*off + 4], data[*off + 5]); 782 if (len >= cbuflen) 783 return (ERANGE); 784 *off += ETHER_ADDR_LEN; 785 return (0); 786} 787 788/****************************************************************** 789 INITIALIZATION 790******************************************************************/ 791 792/* 793 * Handle loading and unloading for this node type. 794 */ 795static int 796ng_ether_mod_event(module_t mod, int event, void *data) 797{ 798 struct ifnet *ifp; 799 int error = 0; 800 int s; 801 802 s = splnet(); 803 switch (event) { 804 case MOD_LOAD: 805 806 /* Register function hooks */ 807 if (ng_ether_attach_p != NULL) { 808 error = EEXIST; 809 break; 810 } 811 ng_ether_attach_p = ng_ether_attach; 812 ng_ether_detach_p = ng_ether_detach; 813 ng_ether_output_p = ng_ether_output; 814 ng_ether_input_p = ng_ether_input; 815 ng_ether_input_orphan_p = ng_ether_input_orphan; 816 817 /* Create nodes for any already-existing Ethernet interfaces */ 818 TAILQ_FOREACH(ifp, &ifnet, if_link) { 819 if (ifp->if_type == IFT_ETHER 820 || ifp->if_type == IFT_L2VLAN) 821 ng_ether_attach(ifp); 822 } 823 break; 824 825 case MOD_UNLOAD: 826 827 /* 828 * Note that the base code won't try to unload us until 829 * all nodes have been removed, and that can't happen 830 * until all Ethernet interfaces are removed. In any 831 * case, we know there are no nodes left if the action 832 * is MOD_UNLOAD, so there's no need to detach any nodes. 833 */ 834 835 /* Unregister function hooks */ 836 ng_ether_attach_p = NULL; 837 ng_ether_detach_p = NULL; 838 ng_ether_output_p = NULL; 839 ng_ether_input_p = NULL; 840 ng_ether_input_orphan_p = NULL; 841 break; 842 843 default: 844 error = EOPNOTSUPP; 845 break; 846 } 847 splx(s); 848 return (error); 849} 850 851