ng_ether.c revision 70700
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 70700 2001-01-06 00:46:47Z julian $ 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}; 79typedef struct private *priv_p; 80 81/* Functional hooks called from if_ethersubr.c */ 82static void ng_ether_input(struct ifnet *ifp, 83 struct mbuf **mp, struct ether_header *eh); 84static void ng_ether_input_orphan(struct ifnet *ifp, 85 struct mbuf *m, struct ether_header *eh); 86static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 87static void ng_ether_attach(struct ifnet *ifp); 88static void ng_ether_detach(struct ifnet *ifp); 89 90/* Other functions */ 91static void ng_ether_input2(node_p node, 92 struct mbuf **mp, struct ether_header *eh); 93static int ng_ether_glueback_header(struct mbuf **mp, 94 struct ether_header *eh); 95static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta); 96static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta); 97 98/* Netgraph node methods */ 99static ng_constructor_t ng_ether_constructor; 100static ng_rcvmsg_t ng_ether_rcvmsg; 101static ng_shutdown_t ng_ether_shutdown; 102static ng_newhook_t ng_ether_newhook; 103static ng_connect_t ng_ether_connect; 104static ng_rcvdata_t ng_ether_rcvdata; 105static ng_disconnect_t ng_ether_disconnect; 106static int ng_ether_mod_event(module_t mod, int event, void *data); 107 108/* Parse type for an Ethernet address */ 109static ng_parse_t ng_enaddr_parse; 110static ng_unparse_t ng_enaddr_unparse; 111const struct ng_parse_type ng_ether_enaddr_type = { 112 NULL, 113 NULL, 114 NULL, 115 ng_enaddr_parse, 116 ng_enaddr_unparse, 117 NULL, /* no such thing as a "default" EN address */ 118 0 119}; 120 121/* List of commands and how to convert arguments to/from ASCII */ 122static const struct ng_cmdlist ng_ether_cmdlist[] = { 123 { 124 NGM_ETHER_COOKIE, 125 NGM_ETHER_GET_IFNAME, 126 "getifname", 127 NULL, 128 &ng_parse_string_type 129 }, 130 { 131 NGM_ETHER_COOKIE, 132 NGM_ETHER_GET_IFINDEX, 133 "getifindex", 134 NULL, 135 &ng_parse_int32_type 136 }, 137 { 138 NGM_ETHER_COOKIE, 139 NGM_ETHER_GET_ENADDR, 140 "getenaddr", 141 NULL, 142 &ng_ether_enaddr_type 143 }, 144 { 145 NGM_ETHER_COOKIE, 146 NGM_ETHER_SET_ENADDR, 147 "setenaddr", 148 &ng_ether_enaddr_type, 149 NULL 150 }, 151 { 152 NGM_ETHER_COOKIE, 153 NGM_ETHER_GET_PROMISC, 154 "getpromisc", 155 NULL, 156 &ng_parse_int32_type 157 }, 158 { 159 NGM_ETHER_COOKIE, 160 NGM_ETHER_SET_PROMISC, 161 "setpromisc", 162 &ng_parse_int32_type, 163 NULL 164 }, 165 { 166 NGM_ETHER_COOKIE, 167 NGM_ETHER_GET_AUTOSRC, 168 "getautosrc", 169 NULL, 170 &ng_parse_int32_type 171 }, 172 { 173 NGM_ETHER_COOKIE, 174 NGM_ETHER_SET_AUTOSRC, 175 "setautosrc", 176 &ng_parse_int32_type, 177 NULL 178 }, 179 { 0 } 180}; 181 182static struct ng_type ng_ether_typestruct = { 183 NG_ABI_VERSION, 184 NG_ETHER_NODE_TYPE, 185 ng_ether_mod_event, 186 ng_ether_constructor, 187 ng_ether_rcvmsg, 188 ng_ether_shutdown, 189 ng_ether_newhook, 190 NULL, 191 ng_ether_connect, 192 ng_ether_rcvdata, 193 ng_ether_disconnect, 194 ng_ether_cmdlist, 195}; 196NETGRAPH_INIT(ether, &ng_ether_typestruct); 197 198/****************************************************************** 199 ETHERNET FUNCTION HOOKS 200******************************************************************/ 201 202/* 203 * Handle a packet that has come in on an interface. We get to 204 * look at it here before any upper layer protocols do. 205 * 206 * NOTE: this function will get called at splimp() 207 */ 208static void 209ng_ether_input(struct ifnet *ifp, 210 struct mbuf **mp, struct ether_header *eh) 211{ 212 const node_p node = IFP2NG(ifp); 213 const priv_p priv = node->private; 214 215 /* If "lower" hook not connected, let packet continue */ 216 if (priv->lower == NULL || priv->lowerOrphan) 217 return; 218 ng_ether_input2(node, mp, eh); 219} 220 221/* 222 * Handle a packet that has come in on an interface, and which 223 * does not match any of our known protocols (an ``orphan''). 224 * 225 * NOTE: this function will get called at splimp() 226 */ 227static void 228ng_ether_input_orphan(struct ifnet *ifp, 229 struct mbuf *m, struct ether_header *eh) 230{ 231 const node_p node = IFP2NG(ifp); 232 const priv_p priv = node->private; 233 234 /* If "orphan" hook not connected, let packet continue */ 235 if (priv->lower == NULL || !priv->lowerOrphan) { 236 m_freem(m); 237 return; 238 } 239 ng_ether_input2(node, &m, eh); 240 if (m != NULL) 241 m_freem(m); 242} 243 244/* 245 * Handle a packet that has come in on an ethernet interface. 246 * The Ethernet header has already been detached from the mbuf, 247 * so we have to put it back. 248 * 249 * NOTE: this function will get called at splimp() 250 */ 251static void 252ng_ether_input2(node_p node, struct mbuf **mp, struct ether_header *eh) 253{ 254 const priv_p priv = node->private; 255 int error; 256 257 /* Glue Ethernet header back on */ 258 if ((error = ng_ether_glueback_header(mp, eh)) != 0) 259 return; 260 261 /* Send out lower/orphan hook */ 262 NG_SEND_DATA_ONLY(error, priv->lower, *mp); 263 *mp = NULL; 264} 265 266/* 267 * Handle a packet that is going out on an interface. 268 * The Ethernet header is already attached to the mbuf. 269 */ 270static int 271ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 272{ 273 const node_p node = IFP2NG(ifp); 274 const priv_p priv = node->private; 275 int error = 0; 276 277 /* If "upper" hook not connected, let packet continue */ 278 if (priv->upper == NULL) 279 return (0); 280 281 /* Send it out "upper" hook */ 282 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 283 return (error); 284} 285 286/* 287 * A new Ethernet interface has been attached. 288 * Create a new node for it, etc. 289 */ 290static void 291ng_ether_attach(struct ifnet *ifp) 292{ 293 char name[IFNAMSIZ + 1]; 294 priv_p priv; 295 node_p node; 296 297 /* Create node */ 298 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __FUNCTION__)); 299 snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit); 300 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 301 log(LOG_ERR, "%s: can't %s for %s\n", 302 __FUNCTION__, "create node", name); 303 return; 304 } 305 306 /* Allocate private data */ 307 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 308 if (priv == NULL) { 309 log(LOG_ERR, "%s: can't %s for %s\n", 310 __FUNCTION__, "allocate memory", name); 311 ng_unref(node); 312 return; 313 } 314 node->private = priv; 315 priv->ifp = ifp; 316 IFP2NG(ifp) = node; 317 priv->autoSrcAddr = 1; 318 319 /* Try to give the node the same name as the interface */ 320 if (ng_name_node(node, name) != 0) { 321 log(LOG_WARNING, "%s: can't name node %s\n", 322 __FUNCTION__, name); 323 } 324} 325 326/* 327 * An Ethernet interface is being detached. 328 * Destroy its node. 329 */ 330static void 331ng_ether_detach(struct ifnet *ifp) 332{ 333 const node_p node = IFP2NG(ifp); 334 priv_p priv; 335 336 if (node == NULL) /* no node (why not?), ignore */ 337 return; 338 ng_rmnode_self(node); /* break all links to other nodes */ 339 node->flags |= NG_INVALID; 340 IFP2NG(ifp) = NULL; /* detach node from interface */ 341 priv = node->private; /* free node private info */ 342 bzero(priv, sizeof(*priv)); 343 FREE(priv, M_NETGRAPH); 344 node->private = NULL; 345 ng_unref(node); /* free node itself */ 346} 347 348/* 349 * Optimization for gluing the Ethernet header back onto 350 * the front of an incoming packet. 351 */ 352static int 353ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh) 354{ 355 struct mbuf *m = *mp; 356 uintfptr_t room; 357 int error = 0; 358 359 /* 360 * Possibly the header is already on the front. 361 * If this is the case so just move the markers back 362 * to re-include it. We lucked out. 363 * This allows us to avoid a yucky m_pullup 364 * in later nodes if it works. 365 */ 366 if (eh == mtod(m, struct ether_header *) - 1) { 367 m->m_len += sizeof(*eh); 368 m->m_data -= sizeof(*eh); 369 m->m_pkthdr.len += sizeof(*eh); 370 goto done; 371 } 372 373 /* 374 * Alternatively there may be room even though 375 * it is stored somewhere else. If so, copy it in. 376 * This only safe because we KNOW that this packet has 377 * just been generated by an ethernet card, so there are 378 * no aliases to the buffer (not so for outgoing packets). 379 * Nearly all ethernet cards will end up producing mbufs 380 * that fall into these cases. So we are not optimizing 381 * contorted cases. 382 */ 383 if ((m->m_flags & M_EXT) != 0) { 384 room = mtod(m, caddr_t) - m->m_ext.ext_buf; 385 if (room > m->m_ext.ext_size) /* garbage, fail immediately */ 386 room = 0; 387 } else 388 room = mtod(m, caddr_t) - m->m_pktdat; 389 390 /* 391 * If we have room, just copy it and adjust 392 */ 393 if (room >= sizeof(*eh)) { 394 m->m_len += sizeof(*eh); 395 m->m_data -= sizeof(*eh); 396 m->m_pkthdr.len += sizeof(*eh); 397 goto copy; 398 } 399 400 /* 401 * Doing anything more is likely to get more 402 * expensive than it's worth.. 403 * it's probable that everything else is in one 404 * big lump. The next node will do an m_pullup() 405 * for exactly the amount of data it needs and 406 * hopefully everything after that will not 407 * need one. So let's just use M_PREPEND. 408 */ 409 M_PREPEND(m, sizeof (*eh), M_DONTWAIT); 410 if (m == NULL) { 411 error = ENOBUFS; 412 goto done; 413 } 414 415copy: 416 /* Copy header and return (possibly new) mbuf */ 417 bcopy((caddr_t)eh, mtod(m, struct ether_header *), sizeof(*eh)); 418done: 419 *mp = m; 420 return error; 421} 422 423/****************************************************************** 424 NETGRAPH NODE METHODS 425******************************************************************/ 426 427/* 428 * It is not possible or allowable to create a node of this type. 429 * Nodes get created when the interface is attached (or, when 430 * this node type's KLD is loaded). 431 */ 432static int 433ng_ether_constructor(node_p node) 434{ 435 return (EINVAL); 436} 437 438/* 439 * Check for attaching a new hook. 440 */ 441static int 442ng_ether_newhook(node_p node, hook_p hook, const char *name) 443{ 444 const priv_p priv = node->private; 445 u_char orphan = priv->lowerOrphan; 446 hook_p *hookptr; 447 448 /* Divert hook is an alias for lower */ 449 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 450 name = NG_ETHER_HOOK_LOWER; 451 452 /* Which hook? */ 453 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 454 hookptr = &priv->upper; 455 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 456 hookptr = &priv->lower; 457 orphan = 0; 458 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 459 hookptr = &priv->lower; 460 orphan = 1; 461 } else 462 return (EINVAL); 463 464 /* Check if already connected (shouldn't be, but doesn't hurt) */ 465 if (*hookptr != NULL) 466 return (EISCONN); 467 468 /* OK */ 469 *hookptr = hook; 470 priv->lowerOrphan = orphan; 471 return (0); 472} 473 474/* 475 * Hooks are attached, adjust to force queueing. 476 * We don't really care which hook it is. 477 * they should all be queuing for outgoing data. 478 */ 479static int 480ng_ether_connect(hook_p hook) 481{ 482 hook->peer->flags |= HK_QUEUE; 483 return (0); 484} 485 486/* 487 * Receive an incoming control message. 488 */ 489static int 490ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 491{ 492 const priv_p priv = node->private; 493 struct ng_mesg *resp = NULL; 494 int error = 0; 495 struct ng_mesg *msg; 496 497 NGI_GET_MSG(item, msg); 498 switch (msg->header.typecookie) { 499 case NGM_ETHER_COOKIE: 500 switch (msg->header.cmd) { 501 case NGM_ETHER_GET_IFNAME: 502 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT); 503 if (resp == NULL) { 504 error = ENOMEM; 505 break; 506 } 507 snprintf(resp->data, IFNAMSIZ + 1, 508 "%s%d", priv->ifp->if_name, priv->ifp->if_unit); 509 break; 510 case NGM_ETHER_GET_IFINDEX: 511 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 512 if (resp == NULL) { 513 error = ENOMEM; 514 break; 515 } 516 *((u_int32_t *)resp->data) = priv->ifp->if_index; 517 break; 518 case NGM_ETHER_GET_ENADDR: 519 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 520 if (resp == NULL) { 521 error = ENOMEM; 522 break; 523 } 524 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 525 resp->data, ETHER_ADDR_LEN); 526 break; 527 case NGM_ETHER_SET_ENADDR: 528 { 529 if (msg->header.arglen != ETHER_ADDR_LEN) { 530 error = EINVAL; 531 break; 532 } 533 error = if_setlladdr(priv->ifp, 534 (u_char *)msg->data, ETHER_ADDR_LEN); 535 break; 536 } 537 case NGM_ETHER_GET_PROMISC: 538 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 539 if (resp == NULL) { 540 error = ENOMEM; 541 break; 542 } 543 *((u_int32_t *)resp->data) = priv->promisc; 544 break; 545 case NGM_ETHER_SET_PROMISC: 546 { 547 u_char want; 548 549 if (msg->header.arglen != sizeof(u_int32_t)) { 550 error = EINVAL; 551 break; 552 } 553 want = !!*((u_int32_t *)msg->data); 554 if (want ^ priv->promisc) { 555 if ((error = ifpromisc(priv->ifp, want)) != 0) 556 break; 557 priv->promisc = want; 558 } 559 break; 560 } 561 case NGM_ETHER_GET_AUTOSRC: 562 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 563 if (resp == NULL) { 564 error = ENOMEM; 565 break; 566 } 567 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 568 break; 569 case NGM_ETHER_SET_AUTOSRC: 570 if (msg->header.arglen != sizeof(u_int32_t)) { 571 error = EINVAL; 572 break; 573 } 574 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 575 break; 576 default: 577 error = EINVAL; 578 break; 579 } 580 break; 581 default: 582 error = EINVAL; 583 break; 584 } 585 NG_RESPOND_MSG(error, node, item, resp); 586 NG_FREE_MSG(msg); 587 return (error); 588} 589 590/* 591 * Receive data on a hook. 592 */ 593static int 594ng_ether_rcvdata(hook_p hook, item_p item) 595{ 596 const node_p node = hook->node; 597 const priv_p priv = node->private; 598 struct mbuf *m; 599 meta_p meta; 600 601 NGI_GET_M(item, m); 602 NGI_GET_META(item, meta); 603 NG_FREE_ITEM(item); 604 if (hook == priv->lower) 605 return ng_ether_rcv_lower(node, m, meta); 606 if (hook == priv->upper) 607 return ng_ether_rcv_upper(node, m, meta); 608 panic("%s: weird hook", __FUNCTION__); 609} 610 611/* 612 * Handle an mbuf received on the "lower" hook. 613 */ 614static int 615ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta) 616{ 617 const priv_p priv = node->private; 618 619 /* Make sure header is fully pulled up */ 620 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 621 NG_FREE_M(m); 622 NG_FREE_META(meta); 623 return (EINVAL); 624 } 625 if (m->m_len < sizeof(struct ether_header) 626 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 627 NG_FREE_META(meta); 628 return (ENOBUFS); 629 } 630 631 /* Drop in the MAC address if desired */ 632 if (priv->autoSrcAddr) { 633 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 634 mtod(m, struct ether_header *)->ether_shost, 635 ETHER_ADDR_LEN); 636 } 637 638 /* Send it on its way */ 639 NG_FREE_META(meta); 640 return ether_output_frame(priv->ifp, m); 641} 642 643/* 644 * Handle an mbuf received on the "upper" hook. 645 */ 646static int 647ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta) 648{ 649 const priv_p priv = node->private; 650 struct ether_header *eh; 651 652 /* Check length and pull off header */ 653 if (m->m_pkthdr.len < sizeof(*eh)) { 654 NG_FREE_M(m); 655 NG_FREE_META(meta); 656 return (EINVAL); 657 } 658 if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL) { 659 NG_FREE_META(meta); 660 return (ENOBUFS); 661 } 662 eh = mtod(m, struct ether_header *); 663 m->m_data += sizeof(*eh); 664 m->m_len -= sizeof(*eh); 665 m->m_pkthdr.len -= sizeof(*eh); 666 m->m_pkthdr.rcvif = priv->ifp; 667 668 /* Route packet back in */ 669 NG_FREE_META(meta); 670 ether_demux(priv->ifp, eh, m); 671 return (0); 672} 673 674/* 675 * Shutdown node. This resets the node but does not remove it. 676 * Actually it produces a new node. XXX The problem is what to do when 677 * the node really DOES need to go away, 678 * or if our re-make of the node fails. 679 */ 680static int 681ng_ether_shutdown(node_p node) 682{ 683 char name[IFNAMSIZ + 1]; 684 const priv_p priv = node->private; 685 686 if (priv->promisc) { /* disable promiscuous mode */ 687 (void)ifpromisc(priv->ifp, 0); 688 priv->promisc = 0; 689 } 690 ng_unref(node); 691 snprintf(name, sizeof(name), "%s%d", priv->ifp->if_name, priv->ifp->if_unit); 692 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 693 log(LOG_ERR, "%s: can't %s for %s\n", 694 __FUNCTION__, "create node", name); 695 return (ENOMEM); 696 } 697 698 /* Allocate private data */ 699 node->private = priv; 700 IFP2NG(priv->ifp) = node; 701 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 702 703 /* Try to give the node the same name as the interface */ 704 if (ng_name_node(node, name) != 0) { 705 log(LOG_WARNING, "%s: can't name node %s\n", 706 __FUNCTION__, name); 707 } 708 return (0); 709} 710 711/* 712 * Hook disconnection. 713 */ 714static int 715ng_ether_disconnect(hook_p hook) 716{ 717 const priv_p priv = hook->node->private; 718 719 if (hook == priv->upper) 720 priv->upper = NULL; 721 else if (hook == priv->lower) { 722 priv->lower = NULL; 723 priv->lowerOrphan = 0; 724 } else 725 panic("%s: weird hook", __FUNCTION__); 726 if ((hook->node->numhooks == 0) 727 && ((hook->node->flags & NG_INVALID) == 0)) 728 ng_rmnode_self(hook->node); /* reset node */ 729 return (0); 730} 731 732static int 733ng_enaddr_parse(const struct ng_parse_type *type, 734 const char *s, int *const off, const u_char *const start, 735 u_char *const buf, int *const buflen) 736{ 737 char *eptr; 738 u_long val; 739 int i; 740 741 if (*buflen < ETHER_ADDR_LEN) 742 return (ERANGE); 743 for (i = 0; i < ETHER_ADDR_LEN; i++) { 744 val = strtoul(s + *off, &eptr, 16); 745 if (val > 0xff || eptr == s + *off) 746 return (EINVAL); 747 buf[i] = (u_char)val; 748 *off = (eptr - s); 749 if (i < ETHER_ADDR_LEN - 1) { 750 if (*eptr != ':') 751 return (EINVAL); 752 (*off)++; 753 } 754 } 755 *buflen = ETHER_ADDR_LEN; 756 return (0); 757} 758 759static int 760ng_enaddr_unparse(const struct ng_parse_type *type, 761 const u_char *data, int *off, char *cbuf, int cbuflen) 762{ 763 int len; 764 765 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x", 766 data[*off], data[*off + 1], data[*off + 2], 767 data[*off + 3], data[*off + 4], data[*off + 5]); 768 if (len >= cbuflen) 769 return (ERANGE); 770 *off += ETHER_ADDR_LEN; 771 return (0); 772} 773 774/****************************************************************** 775 INITIALIZATION 776******************************************************************/ 777 778/* 779 * Handle loading and unloading for this node type. 780 */ 781static int 782ng_ether_mod_event(module_t mod, int event, void *data) 783{ 784 struct ifnet *ifp; 785 int error = 0; 786 int s; 787 788 s = splnet(); 789 switch (event) { 790 case MOD_LOAD: 791 792 /* Register function hooks */ 793 if (ng_ether_attach_p != NULL) { 794 error = EEXIST; 795 break; 796 } 797 ng_ether_attach_p = ng_ether_attach; 798 ng_ether_detach_p = ng_ether_detach; 799 ng_ether_output_p = ng_ether_output; 800 ng_ether_input_p = ng_ether_input; 801 ng_ether_input_orphan_p = ng_ether_input_orphan; 802 803 /* Create nodes for any already-existing Ethernet interfaces */ 804 TAILQ_FOREACH(ifp, &ifnet, if_link) { 805 if (ifp->if_type == IFT_ETHER) 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