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: src/sys/netgraph/ng_ether.c,v 1.2.2.13 2002/07/02 20:10:25 archie Exp $ 41 * $DragonFly: src/sys/netgraph/ether/ng_ether.c,v 1.3 2003/08/07 21:17:31 dillon Exp $ 42 */ 43 44 /* 45 * ng_ether(4) netgraph node type 46 */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/errno.h> 54 #include <sys/syslog.h> 55 #include <sys/socket.h> 56 57 #include <net/if.h> 58 #include <net/if_types.h> 59 #include <net/if_arp.h> 60 #include <net/if_var.h> 61 #include <net/ethernet.h> 62 63 #include <netgraph/ng_message.h> 64 #include <netgraph/netgraph.h> 65 #include <netgraph/ng_parse.h> 66 #include "ng_ether.h" 67 68 #define IFP2AC(IFP) ((struct arpcom *)IFP) 69 #define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph) 70 71 /* Per-node private data */ 72 struct private { 73 struct ifnet *ifp; /* associated interface */ 74 hook_p upper; /* upper hook connection */ 75 hook_p lower; /* lower OR orphan hook connection */ 76 u_char lowerOrphan; /* whether lower is lower or orphan */ 77 u_char autoSrcAddr; /* always overwrite source address */ 78 u_char promisc; /* promiscuous mode enabled */ 79 u_long hwassist; /* hardware checksum capabilities */ 80 }; 81 typedef struct private *priv_p; 82 83 /* Functional hooks called from if_ethersubr.c */ 84 static void ng_ether_input(struct ifnet *ifp, 85 struct mbuf **mp, struct ether_header *eh); 86 static void ng_ether_input_orphan(struct ifnet *ifp, 87 struct mbuf *m, struct ether_header *eh); 88 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 89 static void ng_ether_attach(struct ifnet *ifp); 90 static void ng_ether_detach(struct ifnet *ifp); 91 92 /* Other functions */ 93 static void ng_ether_input2(node_p node, 94 struct mbuf **mp, struct ether_header *eh); 95 static int ng_ether_glueback_header(struct mbuf **mp, 96 struct ether_header *eh); 97 static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta); 98 static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta); 99 100 /* Netgraph node methods */ 101 static ng_constructor_t ng_ether_constructor; 102 static ng_rcvmsg_t ng_ether_rcvmsg; 103 static ng_shutdown_t ng_ether_rmnode; 104 static ng_newhook_t ng_ether_newhook; 105 static ng_rcvdata_t ng_ether_rcvdata; 106 static ng_disconnect_t ng_ether_disconnect; 107 static int ng_ether_mod_event(module_t mod, int event, void *data); 108 109 /* Parse type for an Ethernet address */ 110 static ng_parse_t ng_enaddr_parse; 111 static ng_unparse_t ng_enaddr_unparse; 112 const struct ng_parse_type ng_ether_enaddr_type = { 113 NULL, 114 NULL, 115 NULL, 116 ng_enaddr_parse, 117 ng_enaddr_unparse, 118 NULL, /* no such thing as a "default" EN address */ 119 0 120 }; 121 122 /* List of commands and how to convert arguments to/from ASCII */ 123 static const struct ng_cmdlist ng_ether_cmdlist[] = { 124 { 125 NGM_ETHER_COOKIE, 126 NGM_ETHER_GET_IFNAME, 127 "getifname", 128 NULL, 129 &ng_parse_string_type 130 }, 131 { 132 NGM_ETHER_COOKIE, 133 NGM_ETHER_GET_IFINDEX, 134 "getifindex", 135 NULL, 136 &ng_parse_int32_type 137 }, 138 { 139 NGM_ETHER_COOKIE, 140 NGM_ETHER_GET_ENADDR, 141 "getenaddr", 142 NULL, 143 &ng_ether_enaddr_type 144 }, 145 { 146 NGM_ETHER_COOKIE, 147 NGM_ETHER_SET_ENADDR, 148 "setenaddr", 149 &ng_ether_enaddr_type, 150 NULL 151 }, 152 { 153 NGM_ETHER_COOKIE, 154 NGM_ETHER_GET_PROMISC, 155 "getpromisc", 156 NULL, 157 &ng_parse_int32_type 158 }, 159 { 160 NGM_ETHER_COOKIE, 161 NGM_ETHER_SET_PROMISC, 162 "setpromisc", 163 &ng_parse_int32_type, 164 NULL 165 }, 166 { 167 NGM_ETHER_COOKIE, 168 NGM_ETHER_GET_AUTOSRC, 169 "getautosrc", 170 NULL, 171 &ng_parse_int32_type 172 }, 173 { 174 NGM_ETHER_COOKIE, 175 NGM_ETHER_SET_AUTOSRC, 176 "setautosrc", 177 &ng_parse_int32_type, 178 NULL 179 }, 180 { 0 } 181 }; 182 183 static struct ng_type ng_ether_typestruct = { 184 NG_VERSION, 185 NG_ETHER_NODE_TYPE, 186 ng_ether_mod_event, 187 ng_ether_constructor, 188 ng_ether_rcvmsg, 189 ng_ether_rmnode, 190 ng_ether_newhook, 191 NULL, 192 NULL, 193 ng_ether_rcvdata, 194 ng_ether_rcvdata, 195 ng_ether_disconnect, 196 ng_ether_cmdlist, 197 }; 198 NETGRAPH_INIT(ether, &ng_ether_typestruct); 199 200 /****************************************************************** 201 ETHERNET FUNCTION HOOKS 202 ******************************************************************/ 203 204 /* 205 * Handle a packet that has come in on an interface. We get to 206 * look at it here before any upper layer protocols do. 207 * 208 * NOTE: this function will get called at splimp() 209 */ 210 static void 211 ng_ether_input(struct ifnet *ifp, 212 struct mbuf **mp, struct ether_header *eh) 213 { 214 const node_p node = IFP2NG(ifp); 215 const priv_p priv = node->private; 216 217 /* If "lower" hook not connected, let packet continue */ 218 if (priv->lower == NULL || priv->lowerOrphan) 219 return; 220 ng_ether_input2(node, mp, eh); 221 } 222 223 /* 224 * Handle a packet that has come in on an interface, and which 225 * does not match any of our known protocols (an ``orphan''). 226 * 227 * NOTE: this function will get called at splimp() 228 */ 229 static void 230 ng_ether_input_orphan(struct ifnet *ifp, 231 struct mbuf *m, struct ether_header *eh) 232 { 233 const node_p node = IFP2NG(ifp); 234 const priv_p priv = node->private; 235 236 /* If "orphan" hook not connected, let packet continue */ 237 if (priv->lower == NULL || !priv->lowerOrphan) { 238 m_freem(m); 239 return; 240 } 241 ng_ether_input2(node, &m, eh); 242 if (m != NULL) 243 m_freem(m); 244 } 245 246 /* 247 * Handle a packet that has come in on an interface. 248 * The Ethernet header has already been detached from the mbuf, 249 * so we have to put it back. 250 * 251 * NOTE: this function will get called at splimp() 252 */ 253 static void 254 ng_ether_input2(node_p node, struct mbuf **mp, struct ether_header *eh) 255 { 256 const priv_p priv = node->private; 257 meta_p meta = NULL; 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 (void)ng_queue_data(priv->lower, *mp, meta); 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 */ 273 static int 274 ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 275 { 276 const node_p node = IFP2NG(ifp); 277 const priv_p priv = node->private; 278 meta_p meta = NULL; 279 int error = 0; 280 281 /* If "upper" hook not connected, let packet continue */ 282 if (priv->upper == NULL) 283 return (0); 284 285 /* Send it out "upper" hook */ 286 NG_SEND_DATA(error, priv->upper, *mp, meta); 287 *mp = NULL; 288 return (error); 289 } 290 291 /* 292 * A new Ethernet interface has been attached. 293 * Create a new node for it, etc. 294 */ 295 static void 296 ng_ether_attach(struct ifnet *ifp) 297 { 298 char name[IFNAMSIZ + 1]; 299 priv_p priv; 300 node_p node; 301 302 /* Create node */ 303 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __FUNCTION__)); 304 snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit); 305 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 306 log(LOG_ERR, "%s: can't %s for %s\n", 307 __FUNCTION__, "create node", name); 308 return; 309 } 310 311 /* Allocate private data */ 312 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT); 313 if (priv == NULL) { 314 log(LOG_ERR, "%s: can't %s for %s\n", 315 __FUNCTION__, "allocate memory", name); 316 ng_unref(node); 317 return; 318 } 319 bzero(priv, sizeof(*priv)); 320 node->private = priv; 321 priv->ifp = ifp; 322 IFP2NG(ifp) = node; 323 priv->autoSrcAddr = 1; 324 priv->hwassist = ifp->if_hwassist; 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 */ 337 static void 338 ng_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 */ 360 static int 361 ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh) 362 { 363 struct mbuf *m = *mp; 364 int error = 0; 365 366 /* 367 * Optimize for the case where the header is already in place 368 * at the front of the mbuf. This is actually quite likely 369 * because many Ethernet drivers generate packets this way. 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 /* Prepend the header back onto the front of the mbuf */ 379 M_PREPEND(m, sizeof(*eh), M_DONTWAIT); 380 if (m == NULL) { 381 error = ENOBUFS; 382 goto done; 383 } 384 385 /* Copy header into front of mbuf */ 386 bcopy(eh, mtod(m, void *), sizeof(*eh)); 387 388 done: 389 /* Done */ 390 *mp = m; 391 return error; 392 } 393 394 /****************************************************************** 395 NETGRAPH NODE METHODS 396 ******************************************************************/ 397 398 /* 399 * It is not possible or allowable to create a node of this type. 400 * Nodes get created when the interface is attached (or, when 401 * this node type's KLD is loaded). 402 */ 403 static int 404 ng_ether_constructor(node_p *nodep) 405 { 406 return (EINVAL); 407 } 408 409 /* 410 * Check for attaching a new hook. 411 */ 412 static int 413 ng_ether_newhook(node_p node, hook_p hook, const char *name) 414 { 415 const priv_p priv = node->private; 416 u_char orphan = priv->lowerOrphan; 417 hook_p *hookptr; 418 419 /* Divert hook is an alias for lower */ 420 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 421 name = NG_ETHER_HOOK_LOWER; 422 423 /* Which hook? */ 424 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 425 hookptr = &priv->upper; 426 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 427 hookptr = &priv->lower; 428 orphan = 0; 429 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 430 hookptr = &priv->lower; 431 orphan = 1; 432 } else 433 return (EINVAL); 434 435 /* Check if already connected (shouldn't be, but doesn't hurt) */ 436 if (*hookptr != NULL) 437 return (EISCONN); 438 439 /* Disable hardware checksums while 'upper' hook is connected */ 440 if (hookptr == &priv->upper) 441 priv->ifp->if_hwassist = 0; 442 443 /* OK */ 444 *hookptr = hook; 445 priv->lowerOrphan = orphan; 446 return (0); 447 } 448 449 /* 450 * Receive an incoming control message. 451 */ 452 static int 453 ng_ether_rcvmsg(node_p node, struct ng_mesg *msg, 454 const char *retaddr, struct ng_mesg **rptr) 455 { 456 const priv_p priv = node->private; 457 struct ng_mesg *resp = NULL; 458 int error = 0; 459 460 switch (msg->header.typecookie) { 461 case NGM_ETHER_COOKIE: 462 switch (msg->header.cmd) { 463 case NGM_ETHER_GET_IFNAME: 464 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT); 465 if (resp == NULL) { 466 error = ENOMEM; 467 break; 468 } 469 snprintf(resp->data, IFNAMSIZ + 1, 470 "%s%d", priv->ifp->if_name, priv->ifp->if_unit); 471 break; 472 case NGM_ETHER_GET_IFINDEX: 473 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 474 if (resp == NULL) { 475 error = ENOMEM; 476 break; 477 } 478 *((u_int32_t *)resp->data) = priv->ifp->if_index; 479 break; 480 case NGM_ETHER_GET_ENADDR: 481 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 482 if (resp == NULL) { 483 error = ENOMEM; 484 break; 485 } 486 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 487 resp->data, ETHER_ADDR_LEN); 488 break; 489 case NGM_ETHER_SET_ENADDR: 490 { 491 if (msg->header.arglen != ETHER_ADDR_LEN) { 492 error = EINVAL; 493 break; 494 } 495 error = if_setlladdr(priv->ifp, 496 (u_char *)msg->data, ETHER_ADDR_LEN); 497 break; 498 } 499 case NGM_ETHER_GET_PROMISC: 500 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 501 if (resp == NULL) { 502 error = ENOMEM; 503 break; 504 } 505 *((u_int32_t *)resp->data) = priv->promisc; 506 break; 507 case NGM_ETHER_SET_PROMISC: 508 { 509 u_char want; 510 511 if (msg->header.arglen != sizeof(u_int32_t)) { 512 error = EINVAL; 513 break; 514 } 515 want = !!*((u_int32_t *)msg->data); 516 if (want ^ priv->promisc) { 517 if ((error = ifpromisc(priv->ifp, want)) != 0) 518 break; 519 priv->promisc = want; 520 } 521 break; 522 } 523 case NGM_ETHER_GET_AUTOSRC: 524 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 525 if (resp == NULL) { 526 error = ENOMEM; 527 break; 528 } 529 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 530 break; 531 case NGM_ETHER_SET_AUTOSRC: 532 if (msg->header.arglen != sizeof(u_int32_t)) { 533 error = EINVAL; 534 break; 535 } 536 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 537 break; 538 default: 539 error = EINVAL; 540 break; 541 } 542 break; 543 default: 544 error = EINVAL; 545 break; 546 } 547 if (rptr) 548 *rptr = resp; 549 else if (resp != NULL) 550 FREE(resp, M_NETGRAPH); 551 FREE(msg, M_NETGRAPH); 552 return (error); 553 } 554 555 /* 556 * Receive data on a hook. 557 */ 558 static int 559 ng_ether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 560 { 561 const node_p node = hook->node; 562 const priv_p priv = node->private; 563 564 if (hook == priv->lower) 565 return ng_ether_rcv_lower(node, m, meta); 566 if (hook == priv->upper) 567 return ng_ether_rcv_upper(node, m, meta); 568 panic("%s: weird hook", __FUNCTION__); 569 } 570 571 /* 572 * Handle an mbuf received on the "lower" hook. 573 */ 574 static int 575 ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta) 576 { 577 const priv_p priv = node->private; 578 struct ifnet *const ifp = priv->ifp; 579 580 /* Discard meta info */ 581 NG_FREE_META(meta); 582 583 /* Check whether interface is ready for packets */ 584 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 585 m_freem(m); 586 return (ENETDOWN); 587 } 588 589 /* Make sure header is fully pulled up */ 590 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 591 m_freem(m); 592 return (EINVAL); 593 } 594 if (m->m_len < sizeof(struct ether_header) 595 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 596 return (ENOBUFS); 597 598 /* Drop in the MAC address if desired */ 599 if (priv->autoSrcAddr) { 600 601 /* Make the mbuf writable if it's not already */ 602 if (!M_WRITABLE(m) 603 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 604 return (ENOBUFS); 605 606 /* Overwrite source MAC address */ 607 bcopy((IFP2AC(ifp))->ac_enaddr, 608 mtod(m, struct ether_header *)->ether_shost, 609 ETHER_ADDR_LEN); 610 } 611 612 /* Send it on its way */ 613 return ether_output_frame(ifp, m); 614 } 615 616 /* 617 * Handle an mbuf received on the "upper" hook. 618 */ 619 static int 620 ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta) 621 { 622 const priv_p priv = node->private; 623 struct ether_header *eh; 624 625 /* Discard meta info */ 626 NG_FREE_META(meta); 627 628 /* Check length and pull off header */ 629 if (m->m_pkthdr.len < sizeof(*eh)) { 630 m_freem(m); 631 return (EINVAL); 632 } 633 if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL) 634 return (ENOBUFS); 635 eh = mtod(m, struct ether_header *); 636 m->m_data += sizeof(*eh); 637 m->m_len -= sizeof(*eh); 638 m->m_pkthdr.len -= sizeof(*eh); 639 m->m_pkthdr.rcvif = priv->ifp; 640 641 /* Route packet back in */ 642 ether_demux(priv->ifp, eh, m); 643 return (0); 644 } 645 646 /* 647 * Shutdown node. This resets the node but does not remove it. 648 */ 649 static int 650 ng_ether_rmnode(node_p node) 651 { 652 const priv_p priv = node->private; 653 654 ng_cutlinks(node); 655 node->flags &= ~NG_INVALID; /* bounce back to life */ 656 if (priv->promisc) { /* disable promiscuous mode */ 657 (void)ifpromisc(priv->ifp, 0); 658 priv->promisc = 0; 659 } 660 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 661 return (0); 662 } 663 664 /* 665 * Hook disconnection. 666 */ 667 static int 668 ng_ether_disconnect(hook_p hook) 669 { 670 const priv_p priv = hook->node->private; 671 672 if (hook == priv->upper) { 673 priv->upper = NULL; 674 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */ 675 } else if (hook == priv->lower) { 676 priv->lower = NULL; 677 priv->lowerOrphan = 0; 678 } else 679 panic("%s: weird hook", __FUNCTION__); 680 if (hook->node->numhooks == 0) 681 ng_rmnode(hook->node); /* reset node */ 682 return (0); 683 } 684 685 static int 686 ng_enaddr_parse(const struct ng_parse_type *type, 687 const char *s, int *const off, const u_char *const start, 688 u_char *const buf, int *const buflen) 689 { 690 char *eptr; 691 u_long val; 692 int i; 693 694 if (*buflen < ETHER_ADDR_LEN) 695 return (ERANGE); 696 for (i = 0; i < ETHER_ADDR_LEN; i++) { 697 val = strtoul(s + *off, &eptr, 16); 698 if (val > 0xff || eptr == s + *off) 699 return (EINVAL); 700 buf[i] = (u_char)val; 701 *off = (eptr - s); 702 if (i < ETHER_ADDR_LEN - 1) { 703 if (*eptr != ':') 704 return (EINVAL); 705 (*off)++; 706 } 707 } 708 *buflen = ETHER_ADDR_LEN; 709 return (0); 710 } 711 712 static int 713 ng_enaddr_unparse(const struct ng_parse_type *type, 714 const u_char *data, int *off, char *cbuf, int cbuflen) 715 { 716 int len; 717 718 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x", 719 data[*off], data[*off + 1], data[*off + 2], 720 data[*off + 3], data[*off + 4], data[*off + 5]); 721 if (len >= cbuflen) 722 return (ERANGE); 723 *off += ETHER_ADDR_LEN; 724 return (0); 725 } 726 727 /****************************************************************** 728 INITIALIZATION 729 ******************************************************************/ 730 731 /* 732 * Handle loading and unloading for this node type. 733 */ 734 static int 735 ng_ether_mod_event(module_t mod, int event, void *data) 736 { 737 struct ifnet *ifp; 738 int error = 0; 739 int s; 740 741 s = splnet(); 742 switch (event) { 743 case MOD_LOAD: 744 745 /* Register function hooks */ 746 if (ng_ether_attach_p != NULL) { 747 error = EEXIST; 748 break; 749 } 750 ng_ether_attach_p = ng_ether_attach; 751 ng_ether_detach_p = ng_ether_detach; 752 ng_ether_output_p = ng_ether_output; 753 ng_ether_input_p = ng_ether_input; 754 ng_ether_input_orphan_p = ng_ether_input_orphan; 755 756 /* Create nodes for any already-existing Ethernet interfaces */ 757 TAILQ_FOREACH(ifp, &ifnet, if_link) { 758 if (ifp->if_type == IFT_ETHER || 759 ifp->if_type == IFT_L2VLAN) 760 ng_ether_attach(ifp); 761 } 762 break; 763 764 case MOD_UNLOAD: 765 766 /* 767 * Note that the base code won't try to unload us until 768 * all nodes have been removed, and that can't happen 769 * until all Ethernet interfaces are removed. In any 770 * case, we know there are no nodes left if the action 771 * is MOD_UNLOAD, so there's no need to detach any nodes. 772 */ 773 774 /* Unregister function hooks */ 775 ng_ether_attach_p = NULL; 776 ng_ether_detach_p = NULL; 777 ng_ether_output_p = NULL; 778 ng_ether_input_p = NULL; 779 ng_ether_input_orphan_p = NULL; 780 break; 781 782 default: 783 error = EOPNOTSUPP; 784 break; 785 } 786 splx(s); 787 return (error); 788 } 789 790