ng_ether.c revision 69922
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 69922 2000-12-12 18:52:14Z 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_rmnode; 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_VERSION, 184 NG_ETHER_NODE_TYPE, 185 ng_ether_mod_event, 186 ng_ether_constructor, 187 ng_ether_rcvmsg, 188 ng_ether_rmnode, 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 meta_p meta = NULL; 276 int error = 0; 277 278 /* If "upper" hook not connected, let packet continue */ 279 if (priv->upper == NULL) 280 return (0); 281 282 /* Send it out "upper" hook */ 283 NG_SEND_DATA_RET(error, priv->upper, *mp, meta, NULL); 284 285 /* If we got a reflected packet back, handle it */ 286 if (error == 0 && *mp != NULL) { 287 error = ng_ether_rcv_upper(node, *mp, meta); 288 *mp = NULL; 289 } 290 return (error); 291} 292 293/* 294 * A new Ethernet interface has been attached. 295 * Create a new node for it, etc. 296 */ 297static void 298ng_ether_attach(struct ifnet *ifp) 299{ 300 char name[IFNAMSIZ + 1]; 301 priv_p priv; 302 node_p node; 303 304 /* Create node */ 305 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __FUNCTION__)); 306 snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit); 307 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 308 log(LOG_ERR, "%s: can't %s for %s\n", 309 __FUNCTION__, "create node", name); 310 return; 311 } 312 313 /* Allocate private data */ 314 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 315 if (priv == NULL) { 316 log(LOG_ERR, "%s: can't %s for %s\n", 317 __FUNCTION__, "allocate memory", name); 318 ng_unref(node); 319 return; 320 } 321 node->private = priv; 322 priv->ifp = ifp; 323 IFP2NG(ifp) = node; 324 priv->autoSrcAddr = 1; 325 326 /* Try to give the node the same name as the interface */ 327 if (ng_name_node(node, name) != 0) { 328 log(LOG_WARNING, "%s: can't name node %s\n", 329 __FUNCTION__, name); 330 } 331} 332 333/* 334 * An Ethernet interface is being detached. 335 * Destroy its node. 336 */ 337static void 338ng_ether_detach(struct ifnet *ifp) 339{ 340 const node_p node = IFP2NG(ifp); 341 priv_p priv; 342 343 if (node == NULL) /* no node (why not?), ignore */ 344 return; 345 ng_rmnode(node); /* break all links to other nodes */ 346 node->flags |= NG_INVALID; 347 ng_unname(node); /* free name (and its reference) */ 348 IFP2NG(ifp) = NULL; /* detach node from interface */ 349 priv = node->private; /* free node private info */ 350 bzero(priv, sizeof(*priv)); 351 FREE(priv, M_NETGRAPH); 352 node->private = NULL; 353 ng_unref(node); /* free node itself */ 354} 355 356/* 357 * Optimization for gluing the Ethernet header back onto 358 * the front of an incoming packet. 359 */ 360static int 361ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh) 362{ 363 struct mbuf *m = *mp; 364 uintfptr_t room; 365 int error = 0; 366 367 /* 368 * Possibly the header is already on the front. 369 * If this is the case so just move the markers back 370 * to re-include it. We lucked out. 371 * This allows us to avoid a yucky m_pullup 372 * in later nodes if it works. 373 */ 374 if (eh == mtod(m, struct ether_header *) - 1) { 375 m->m_len += sizeof(*eh); 376 m->m_data -= sizeof(*eh); 377 m->m_pkthdr.len += sizeof(*eh); 378 goto done; 379 } 380 381 /* 382 * Alternatively there may be room even though 383 * it is stored somewhere else. If so, copy it in. 384 * This only safe because we KNOW that this packet has 385 * just been generated by an ethernet card, so there are 386 * no aliases to the buffer (not so for outgoing packets). 387 * Nearly all ethernet cards will end up producing mbufs 388 * that fall into these cases. So we are not optimizing 389 * contorted cases. 390 */ 391 if ((m->m_flags & M_EXT) != 0) { 392 room = mtod(m, caddr_t) - m->m_ext.ext_buf; 393 if (room > m->m_ext.ext_size) /* garbage, fail immediately */ 394 room = 0; 395 } else 396 room = mtod(m, caddr_t) - m->m_pktdat; 397 398 /* 399 * If we have room, just copy it and adjust 400 */ 401 if (room >= sizeof(*eh)) { 402 m->m_len += sizeof(*eh); 403 m->m_data -= sizeof(*eh); 404 m->m_pkthdr.len += sizeof(*eh); 405 goto copy; 406 } 407 408 /* 409 * Doing anything more is likely to get more 410 * expensive than it's worth.. 411 * it's probable that everything else is in one 412 * big lump. The next node will do an m_pullup() 413 * for exactly the amount of data it needs and 414 * hopefully everything after that will not 415 * need one. So let's just use M_PREPEND. 416 */ 417 M_PREPEND(m, sizeof (*eh), M_DONTWAIT); 418 if (m == NULL) { 419 error = ENOBUFS; 420 goto done; 421 } 422 423copy: 424 /* Copy header and return (possibly new) mbuf */ 425 bcopy((caddr_t)eh, mtod(m, struct ether_header *), sizeof(*eh)); 426done: 427 *mp = m; 428 return error; 429} 430 431/****************************************************************** 432 NETGRAPH NODE METHODS 433******************************************************************/ 434 435/* 436 * It is not possible or allowable to create a node of this type. 437 * Nodes get created when the interface is attached (or, when 438 * this node type's KLD is loaded). 439 */ 440static int 441ng_ether_constructor(node_p *nodep) 442{ 443 return (EINVAL); 444} 445 446/* 447 * Check for attaching a new hook. 448 */ 449static int 450ng_ether_newhook(node_p node, hook_p hook, const char *name) 451{ 452 const priv_p priv = node->private; 453 u_char orphan = priv->lowerOrphan; 454 hook_p *hookptr; 455 456 /* Divert hook is an alias for lower */ 457 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 458 name = NG_ETHER_HOOK_LOWER; 459 460 /* Which hook? */ 461 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 462 hookptr = &priv->upper; 463 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 464 hookptr = &priv->lower; 465 orphan = 0; 466 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 467 hookptr = &priv->lower; 468 orphan = 1; 469 } else 470 return (EINVAL); 471 472 /* Check if already connected (shouldn't be, but doesn't hurt) */ 473 if (*hookptr != NULL) 474 return (EISCONN); 475 476 /* OK */ 477 *hookptr = hook; 478 priv->lowerOrphan = orphan; 479 return (0); 480} 481 482/* 483 * Hooks are attached, adjust to force queueing. 484 * We don't really care which hook it is. 485 * they should all be queuing for outgoing data. 486 */ 487static int 488ng_ether_connect(hook_p hook) 489{ 490 hook->peer->flags |= HK_QUEUE; 491 return (0); 492} 493 494/* 495 * Receive an incoming control message. 496 */ 497static int 498ng_ether_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 499 struct ng_mesg **rptr, hook_p lasthook) 500{ 501 const priv_p priv = node->private; 502 struct ng_mesg *resp = NULL; 503 int error = 0; 504 505 switch (msg->header.typecookie) { 506 case NGM_ETHER_COOKIE: 507 switch (msg->header.cmd) { 508 case NGM_ETHER_GET_IFNAME: 509 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT); 510 if (resp == NULL) { 511 error = ENOMEM; 512 break; 513 } 514 snprintf(resp->data, IFNAMSIZ + 1, 515 "%s%d", priv->ifp->if_name, priv->ifp->if_unit); 516 break; 517 case NGM_ETHER_GET_IFINDEX: 518 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 519 if (resp == NULL) { 520 error = ENOMEM; 521 break; 522 } 523 *((u_int32_t *)resp->data) = priv->ifp->if_index; 524 break; 525 case NGM_ETHER_GET_ENADDR: 526 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 527 if (resp == NULL) { 528 error = ENOMEM; 529 break; 530 } 531 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 532 resp->data, ETHER_ADDR_LEN); 533 break; 534 case NGM_ETHER_SET_ENADDR: 535 { 536 if (msg->header.arglen != ETHER_ADDR_LEN) { 537 error = EINVAL; 538 break; 539 } 540 error = if_setlladdr(priv->ifp, 541 (u_char *)msg->data, ETHER_ADDR_LEN); 542 break; 543 } 544 case NGM_ETHER_GET_PROMISC: 545 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 546 if (resp == NULL) { 547 error = ENOMEM; 548 break; 549 } 550 *((u_int32_t *)resp->data) = priv->promisc; 551 break; 552 case NGM_ETHER_SET_PROMISC: 553 { 554 u_char want; 555 556 if (msg->header.arglen != sizeof(u_int32_t)) { 557 error = EINVAL; 558 break; 559 } 560 want = !!*((u_int32_t *)msg->data); 561 if (want ^ priv->promisc) { 562 if ((error = ifpromisc(priv->ifp, want)) != 0) 563 break; 564 priv->promisc = want; 565 } 566 break; 567 } 568 case NGM_ETHER_GET_AUTOSRC: 569 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 570 if (resp == NULL) { 571 error = ENOMEM; 572 break; 573 } 574 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 575 break; 576 case NGM_ETHER_SET_AUTOSRC: 577 if (msg->header.arglen != sizeof(u_int32_t)) { 578 error = EINVAL; 579 break; 580 } 581 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 582 break; 583 default: 584 error = EINVAL; 585 break; 586 } 587 break; 588 default: 589 error = EINVAL; 590 break; 591 } 592 if (rptr) 593 *rptr = resp; 594 else if (resp != NULL) 595 FREE(resp, M_NETGRAPH); 596 FREE(msg, M_NETGRAPH); 597 return (error); 598} 599 600/* 601 * Receive data on a hook. 602 */ 603static int 604ng_ether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta, 605 struct mbuf **ret_m, meta_p *ret_meta, struct ng_mesg **resp) 606{ 607 const node_p node = hook->node; 608 const priv_p priv = node->private; 609 610 if (hook == priv->lower) 611 return ng_ether_rcv_lower(node, m, meta); 612 if (hook == priv->upper) 613 return ng_ether_rcv_upper(node, m, meta); 614 panic("%s: weird hook", __FUNCTION__); 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 = node->private; 624 625 /* Make sure header is fully pulled up */ 626 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 627 NG_FREE_DATA(m, meta); 628 return (EINVAL); 629 } 630 if (m->m_len < sizeof(struct ether_header) 631 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 632 NG_FREE_META(meta); 633 return (ENOBUFS); 634 } 635 636 /* Drop in the MAC address if desired */ 637 if (priv->autoSrcAddr) { 638 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 639 mtod(m, struct ether_header *)->ether_shost, 640 ETHER_ADDR_LEN); 641 } 642 643 /* Send it on its way */ 644 NG_FREE_META(meta); 645 return ether_output_frame(priv->ifp, m); 646} 647 648/* 649 * Handle an mbuf received on the "upper" hook. 650 */ 651static int 652ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta) 653{ 654 const priv_p priv = node->private; 655 struct ether_header *eh; 656 657 /* Check length and pull off header */ 658 if (m->m_pkthdr.len < sizeof(*eh)) { 659 NG_FREE_DATA(m, meta); 660 return (EINVAL); 661 } 662 if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL) { 663 NG_FREE_META(meta); 664 return (ENOBUFS); 665 } 666 eh = mtod(m, struct ether_header *); 667 m->m_data += sizeof(*eh); 668 m->m_len -= sizeof(*eh); 669 m->m_pkthdr.len -= sizeof(*eh); 670 m->m_pkthdr.rcvif = priv->ifp; 671 672 /* Route packet back in */ 673 NG_FREE_META(meta); 674 ether_demux(priv->ifp, eh, m); 675 return (0); 676} 677 678/* 679 * Shutdown node. This resets the node but does not remove it. 680 */ 681static int 682ng_ether_rmnode(node_p node) 683{ 684 const priv_p priv = node->private; 685 686 ng_cutlinks(node); 687 node->flags &= ~NG_INVALID; /* bounce back to life */ 688 if (priv->promisc) { /* disable promiscuous mode */ 689 (void)ifpromisc(priv->ifp, 0); 690 priv->promisc = 0; 691 } 692 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 693 return (0); 694} 695 696/* 697 * Hook disconnection. 698 */ 699static int 700ng_ether_disconnect(hook_p hook) 701{ 702 const priv_p priv = hook->node->private; 703 704 if (hook == priv->upper) 705 priv->upper = NULL; 706 else if (hook == priv->lower) { 707 priv->lower = NULL; 708 priv->lowerOrphan = 0; 709 } else 710 panic("%s: weird hook", __FUNCTION__); 711 if (hook->node->numhooks == 0) 712 ng_rmnode(hook->node); /* reset node */ 713 return (0); 714} 715 716static int 717ng_enaddr_parse(const struct ng_parse_type *type, 718 const char *s, int *const off, const u_char *const start, 719 u_char *const buf, int *const buflen) 720{ 721 char *eptr; 722 u_long val; 723 int i; 724 725 if (*buflen < ETHER_ADDR_LEN) 726 return (ERANGE); 727 for (i = 0; i < ETHER_ADDR_LEN; i++) { 728 val = strtoul(s + *off, &eptr, 16); 729 if (val > 0xff || eptr == s + *off) 730 return (EINVAL); 731 buf[i] = (u_char)val; 732 *off = (eptr - s); 733 if (i < ETHER_ADDR_LEN - 1) { 734 if (*eptr != ':') 735 return (EINVAL); 736 (*off)++; 737 } 738 } 739 *buflen = ETHER_ADDR_LEN; 740 return (0); 741} 742 743static int 744ng_enaddr_unparse(const struct ng_parse_type *type, 745 const u_char *data, int *off, char *cbuf, int cbuflen) 746{ 747 int len; 748 749 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x", 750 data[*off], data[*off + 1], data[*off + 2], 751 data[*off + 3], data[*off + 4], data[*off + 5]); 752 if (len >= cbuflen) 753 return (ERANGE); 754 *off += ETHER_ADDR_LEN; 755 return (0); 756} 757 758/****************************************************************** 759 INITIALIZATION 760******************************************************************/ 761 762/* 763 * Handle loading and unloading for this node type. 764 */ 765static int 766ng_ether_mod_event(module_t mod, int event, void *data) 767{ 768 struct ifnet *ifp; 769 int error = 0; 770 int s; 771 772 s = splnet(); 773 switch (event) { 774 case MOD_LOAD: 775 776 /* Register function hooks */ 777 if (ng_ether_attach_p != NULL) { 778 error = EEXIST; 779 break; 780 } 781 ng_ether_attach_p = ng_ether_attach; 782 ng_ether_detach_p = ng_ether_detach; 783 ng_ether_output_p = ng_ether_output; 784 ng_ether_input_p = ng_ether_input; 785 ng_ether_input_orphan_p = ng_ether_input_orphan; 786 787 /* Create nodes for any already-existing Ethernet interfaces */ 788 TAILQ_FOREACH(ifp, &ifnet, if_link) { 789 if (ifp->if_type == IFT_ETHER) 790 ng_ether_attach(ifp); 791 } 792 break; 793 794 case MOD_UNLOAD: 795 796 /* 797 * Note that the base code won't try to unload us until 798 * all nodes have been removed, and that can't happen 799 * until all Ethernet interfaces are removed. In any 800 * case, we know there are no nodes left if the action 801 * is MOD_UNLOAD, so there's no need to detach any nodes. 802 */ 803 804 /* Unregister function hooks */ 805 ng_ether_attach_p = NULL; 806 ng_ether_detach_p = NULL; 807 ng_ether_output_p = NULL; 808 ng_ether_input_p = NULL; 809 ng_ether_input_orphan_p = NULL; 810 break; 811 812 default: 813 error = EOPNOTSUPP; 814 break; 815 } 816 splx(s); 817 return (error); 818} 819 820