ng_ether.c revision 70784
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 70784 2001-01-08 05:34:06Z 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 = NG_NODE_PRIVATE(node); 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 = NG_NODE_PRIVATE(node); 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 = NG_NODE_PRIVATE(node); 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 = NG_NODE_PRIVATE(node); 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_NODE_UNREF(node); 312 return; 313 } 314 NG_NODE_SET_PRIVATE(node, 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 IFP2NG(ifp) = NULL; /* detach node from interface */ 340 priv = NG_NODE_PRIVATE(node); /* free node private info */ 341 bzero(priv, sizeof(*priv)); 342 FREE(priv, M_NETGRAPH); 343 NG_NODE_SET_PRIVATE(node, NULL); 344 NG_NODE_UNREF(node); /* free node itself */ 345} 346 347/* 348 * Optimization for gluing the Ethernet header back onto 349 * the front of an incoming packet. 350 */ 351static int 352ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh) 353{ 354 struct mbuf *m = *mp; 355 uintfptr_t room; 356 int error = 0; 357 358 /* 359 * Possibly the header is already on the front. 360 * If this is the case so just move the markers back 361 * to re-include it. We lucked out. 362 * This allows us to avoid a yucky m_pullup 363 * in later nodes if it works. 364 */ 365 if (eh == mtod(m, struct ether_header *) - 1) { 366 m->m_len += sizeof(*eh); 367 m->m_data -= sizeof(*eh); 368 m->m_pkthdr.len += sizeof(*eh); 369 goto done; 370 } 371 372 /* 373 * Alternatively there may be room even though 374 * it is stored somewhere else. If so, copy it in. 375 * This only safe because we KNOW that this packet has 376 * just been generated by an ethernet card, so there are 377 * no aliases to the buffer (not so for outgoing packets). 378 * Nearly all ethernet cards will end up producing mbufs 379 * that fall into these cases. So we are not optimizing 380 * contorted cases. 381 */ 382 if ((m->m_flags & M_EXT) != 0) { 383 room = mtod(m, caddr_t) - m->m_ext.ext_buf; 384 if (room > m->m_ext.ext_size) /* garbage, fail immediately */ 385 room = 0; 386 } else 387 room = mtod(m, caddr_t) - m->m_pktdat; 388 389 /* 390 * If we have room, just copy it and adjust 391 */ 392 if (room >= sizeof(*eh)) { 393 m->m_len += sizeof(*eh); 394 m->m_data -= sizeof(*eh); 395 m->m_pkthdr.len += sizeof(*eh); 396 goto copy; 397 } 398 399 /* 400 * Doing anything more is likely to get more 401 * expensive than it's worth.. 402 * it's probable that everything else is in one 403 * big lump. The next node will do an m_pullup() 404 * for exactly the amount of data it needs and 405 * hopefully everything after that will not 406 * need one. So let's just use M_PREPEND. 407 */ 408 M_PREPEND(m, sizeof (*eh), M_DONTWAIT); 409 if (m == NULL) { 410 error = ENOBUFS; 411 goto done; 412 } 413 414copy: 415 /* Copy header and return (possibly new) mbuf */ 416 bcopy((caddr_t)eh, mtod(m, struct ether_header *), sizeof(*eh)); 417done: 418 *mp = m; 419 return error; 420} 421 422/****************************************************************** 423 NETGRAPH NODE METHODS 424******************************************************************/ 425 426/* 427 * It is not possible or allowable to create a node of this type. 428 * Nodes get created when the interface is attached (or, when 429 * this node type's KLD is loaded). 430 */ 431static int 432ng_ether_constructor(node_p node) 433{ 434 return (EINVAL); 435} 436 437/* 438 * Check for attaching a new hook. 439 */ 440static int 441ng_ether_newhook(node_p node, hook_p hook, const char *name) 442{ 443 const priv_p priv = NG_NODE_PRIVATE(node); 444 u_char orphan = priv->lowerOrphan; 445 hook_p *hookptr; 446 447 /* Divert hook is an alias for lower */ 448 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 449 name = NG_ETHER_HOOK_LOWER; 450 451 /* Which hook? */ 452 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 453 hookptr = &priv->upper; 454 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 455 hookptr = &priv->lower; 456 orphan = 0; 457 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 458 hookptr = &priv->lower; 459 orphan = 1; 460 } else 461 return (EINVAL); 462 463 /* Check if already connected (shouldn't be, but doesn't hurt) */ 464 if (*hookptr != NULL) 465 return (EISCONN); 466 467 /* OK */ 468 *hookptr = hook; 469 priv->lowerOrphan = orphan; 470 return (0); 471} 472 473/* 474 * Hooks are attached, adjust to force queueing. 475 * We don't really care which hook it is. 476 * they should all be queuing for outgoing data. 477 */ 478static int 479ng_ether_connect(hook_p hook) 480{ 481 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); 482 return (0); 483} 484 485/* 486 * Receive an incoming control message. 487 */ 488static int 489ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 490{ 491 const priv_p priv = NG_NODE_PRIVATE(node); 492 struct ng_mesg *resp = NULL; 493 int error = 0; 494 struct ng_mesg *msg; 495 496 NGI_GET_MSG(item, msg); 497 switch (msg->header.typecookie) { 498 case NGM_ETHER_COOKIE: 499 switch (msg->header.cmd) { 500 case NGM_ETHER_GET_IFNAME: 501 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT); 502 if (resp == NULL) { 503 error = ENOMEM; 504 break; 505 } 506 snprintf(resp->data, IFNAMSIZ + 1, 507 "%s%d", priv->ifp->if_name, priv->ifp->if_unit); 508 break; 509 case NGM_ETHER_GET_IFINDEX: 510 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 511 if (resp == NULL) { 512 error = ENOMEM; 513 break; 514 } 515 *((u_int32_t *)resp->data) = priv->ifp->if_index; 516 break; 517 case NGM_ETHER_GET_ENADDR: 518 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 519 if (resp == NULL) { 520 error = ENOMEM; 521 break; 522 } 523 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 524 resp->data, ETHER_ADDR_LEN); 525 break; 526 case NGM_ETHER_SET_ENADDR: 527 { 528 if (msg->header.arglen != ETHER_ADDR_LEN) { 529 error = EINVAL; 530 break; 531 } 532 error = if_setlladdr(priv->ifp, 533 (u_char *)msg->data, ETHER_ADDR_LEN); 534 break; 535 } 536 case NGM_ETHER_GET_PROMISC: 537 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 538 if (resp == NULL) { 539 error = ENOMEM; 540 break; 541 } 542 *((u_int32_t *)resp->data) = priv->promisc; 543 break; 544 case NGM_ETHER_SET_PROMISC: 545 { 546 u_char want; 547 548 if (msg->header.arglen != sizeof(u_int32_t)) { 549 error = EINVAL; 550 break; 551 } 552 want = !!*((u_int32_t *)msg->data); 553 if (want ^ priv->promisc) { 554 if ((error = ifpromisc(priv->ifp, want)) != 0) 555 break; 556 priv->promisc = want; 557 } 558 break; 559 } 560 case NGM_ETHER_GET_AUTOSRC: 561 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 562 if (resp == NULL) { 563 error = ENOMEM; 564 break; 565 } 566 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 567 break; 568 case NGM_ETHER_SET_AUTOSRC: 569 if (msg->header.arglen != sizeof(u_int32_t)) { 570 error = EINVAL; 571 break; 572 } 573 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 574 break; 575 default: 576 error = EINVAL; 577 break; 578 } 579 break; 580 default: 581 error = EINVAL; 582 break; 583 } 584 NG_RESPOND_MSG(error, node, item, resp); 585 NG_FREE_MSG(msg); 586 return (error); 587} 588 589/* 590 * Receive data on a hook. 591 */ 592static int 593ng_ether_rcvdata(hook_p hook, item_p item) 594{ 595 const node_p node = NG_HOOK_NODE(hook); 596 const priv_p priv = NG_NODE_PRIVATE(node); 597 struct mbuf *m; 598 meta_p meta; 599 600 NGI_GET_M(item, m); 601 NGI_GET_META(item, meta); 602 NG_FREE_ITEM(item); 603 if (hook == priv->lower) 604 return ng_ether_rcv_lower(node, m, meta); 605 if (hook == priv->upper) 606 return ng_ether_rcv_upper(node, m, meta); 607 panic("%s: weird hook", __FUNCTION__); 608} 609 610/* 611 * Handle an mbuf received on the "lower" hook. 612 */ 613static int 614ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta) 615{ 616 const priv_p priv = NG_NODE_PRIVATE(node); 617 618 /* Make sure header is fully pulled up */ 619 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 620 NG_FREE_M(m); 621 NG_FREE_META(meta); 622 return (EINVAL); 623 } 624 if (m->m_len < sizeof(struct ether_header) 625 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 626 NG_FREE_META(meta); 627 return (ENOBUFS); 628 } 629 630 /* Drop in the MAC address if desired */ 631 if (priv->autoSrcAddr) { 632 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 633 mtod(m, struct ether_header *)->ether_shost, 634 ETHER_ADDR_LEN); 635 } 636 637 /* Send it on its way */ 638 NG_FREE_META(meta); 639 return ether_output_frame(priv->ifp, m); 640} 641 642/* 643 * Handle an mbuf received on the "upper" hook. 644 */ 645static int 646ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta) 647{ 648 const priv_p priv = NG_NODE_PRIVATE(node); 649 struct ether_header *eh; 650 651 /* Check length and pull off header */ 652 if (m->m_pkthdr.len < sizeof(*eh)) { 653 NG_FREE_M(m); 654 NG_FREE_META(meta); 655 return (EINVAL); 656 } 657 if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL) { 658 NG_FREE_META(meta); 659 return (ENOBUFS); 660 } 661 eh = mtod(m, struct ether_header *); 662 m->m_data += sizeof(*eh); 663 m->m_len -= sizeof(*eh); 664 m->m_pkthdr.len -= sizeof(*eh); 665 m->m_pkthdr.rcvif = priv->ifp; 666 667 /* Route packet back in */ 668 NG_FREE_META(meta); 669 ether_demux(priv->ifp, eh, m); 670 return (0); 671} 672 673/* 674 * Shutdown node. This resets the node but does not remove it. 675 * Actually it produces a new node. XXX The problem is what to do when 676 * the node really DOES need to go away, 677 * or if our re-make of the node fails. 678 */ 679static int 680ng_ether_shutdown(node_p node) 681{ 682 char name[IFNAMSIZ + 1]; 683 const priv_p priv = NG_NODE_PRIVATE(node); 684 685 if (priv->promisc) { /* disable promiscuous mode */ 686 (void)ifpromisc(priv->ifp, 0); 687 priv->promisc = 0; 688 } 689 NG_NODE_UNREF(node); 690 snprintf(name, sizeof(name), "%s%d", priv->ifp->if_name, priv->ifp->if_unit); 691 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 692 log(LOG_ERR, "%s: can't %s for %s\n", 693 __FUNCTION__, "create node", name); 694 return (ENOMEM); 695 } 696 697 /* Allocate private data */ 698 NG_NODE_SET_PRIVATE(node, priv); 699 IFP2NG(priv->ifp) = node; 700 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 701 702 /* Try to give the node the same name as the interface */ 703 if (ng_name_node(node, name) != 0) { 704 log(LOG_WARNING, "%s: can't name node %s\n", 705 __FUNCTION__, name); 706 } 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", __FUNCTION__); 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 ng_ether_attach(ifp); 806 } 807 break; 808 809 case MOD_UNLOAD: 810 811 /* 812 * Note that the base code won't try to unload us until 813 * all nodes have been removed, and that can't happen 814 * until all Ethernet interfaces are removed. In any 815 * case, we know there are no nodes left if the action 816 * is MOD_UNLOAD, so there's no need to detach any nodes. 817 */ 818 819 /* Unregister function hooks */ 820 ng_ether_attach_p = NULL; 821 ng_ether_detach_p = NULL; 822 ng_ether_output_p = NULL; 823 ng_ether_input_p = NULL; 824 ng_ether_input_orphan_p = NULL; 825 break; 826 827 default: 828 error = EOPNOTSUPP; 829 break; 830 } 831 splx(s); 832 return (error); 833} 834 835