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 1.17 2008/07/27 10:06:57 sephe 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 #include <sys/thread2.h> 57 58 #include <net/if.h> 59 #include <net/if_types.h> 60 #include <net/if_arp.h> 61 #include <net/if_var.h> 62 #include <net/ethernet.h> 63 64 #include <netgraph/ng_message.h> 65 #include <netgraph/netgraph.h> 66 #include <netgraph/ng_parse.h> 67 #include "ng_ether.h" 68 69 #define IFP2AC(IFP) ((struct arpcom *)IFP) 70 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph) 71 72 /* Per-node private data */ 73 struct private { 74 struct ifnet *ifp; /* associated interface */ 75 hook_p upper; /* upper hook connection */ 76 hook_p lower; /* lower OR orphan hook connection */ 77 u_char lowerOrphan; /* whether lower is lower or orphan */ 78 u_char autoSrcAddr; /* always overwrite source address */ 79 u_char promisc; /* promiscuous mode enabled */ 80 u_long hwassist; /* hardware checksum capabilities */ 81 }; 82 typedef struct private *priv_p; 83 84 /* Functional hooks called from if_ethersubr.c */ 85 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 86 static void ng_ether_input_orphan(struct ifnet *ifp, 87 struct mbuf *m, const 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, const struct ether_header *eh); 95 static int ng_ether_glueback_header(struct mbuf **mp, 96 const 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 static void 209 ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 210 { 211 const node_p node = IFP2NG(ifp); 212 const priv_p priv = node->private; 213 214 /* If "lower" hook not connected, let packet continue */ 215 if (priv->lower == NULL || priv->lowerOrphan) 216 return; 217 ng_ether_input2(node, mp, NULL); 218 } 219 220 /* 221 * Handle a packet that has come in on an interface, and which 222 * does not match any of our known protocols (an ``orphan''). 223 */ 224 static void 225 ng_ether_input_orphan(struct ifnet *ifp, 226 struct mbuf *m, const struct ether_header *eh) 227 { 228 const node_p node = IFP2NG(ifp); 229 const priv_p priv = node->private; 230 231 /* If "orphan" hook not connected, let packet continue */ 232 if (priv->lower == NULL || !priv->lowerOrphan) { 233 m_freem(m); 234 return; 235 } 236 ng_ether_input2(node, &m, eh); 237 if (m != NULL) 238 m_freem(m); 239 } 240 241 /* 242 * Handle a packet that has come in on an interface. 243 * The Ethernet header has already been detached from the mbuf, 244 * so we have to put it back. 245 * 246 * NOTE: this function will get called at splimp() 247 */ 248 static void 249 ng_ether_input2(node_p node, struct mbuf **mp, const struct ether_header *eh) 250 { 251 const priv_p priv = node->private; 252 meta_p meta = NULL; 253 int error; 254 255 /* Glue Ethernet header back on */ 256 if (eh != NULL && (error = ng_ether_glueback_header(mp, eh)) != 0) 257 return; 258 259 /* Send out lower/orphan hook */ 260 ng_queue_data(priv->lower, *mp, meta); 261 *mp = NULL; 262 } 263 264 /* 265 * Handle a packet that is going out on an interface. 266 * The Ethernet header is already attached to the mbuf. 267 */ 268 static int 269 ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 270 { 271 const node_p node = IFP2NG(ifp); 272 const priv_p priv = node->private; 273 meta_p meta = NULL; 274 int error = 0; 275 276 /* If "upper" hook not connected, let packet continue */ 277 if (priv->upper == NULL) 278 return (0); 279 280 /* Send it out "upper" hook */ 281 NG_SEND_DATA(error, priv->upper, *mp, meta); 282 *mp = NULL; 283 return (error); 284 } 285 286 /* 287 * A new Ethernet interface has been attached. 288 * Create a new node for it, etc. 289 */ 290 static void 291 ng_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?", __func__)); 299 strlcpy(name, ifp->if_xname, sizeof(name)); 300 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 301 log(LOG_ERR, "%s: can't %s for %s\n", 302 __func__, "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 __func__, "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 priv->hwassist = ifp->if_hwassist; 319 320 /* Try to give the node the same name as the interface */ 321 if (ng_name_node(node, name) != 0) { 322 log(LOG_WARNING, "%s: can't name node %s\n", 323 __func__, name); 324 } 325 } 326 327 /* 328 * An Ethernet interface is being detached. 329 * Destroy its node. 330 */ 331 static void 332 ng_ether_detach(struct ifnet *ifp) 333 { 334 const node_p node = IFP2NG(ifp); 335 priv_p priv; 336 337 if (node == NULL) /* no node (why not?), ignore */ 338 return; 339 ng_rmnode(node); /* break all links to other nodes */ 340 node->flags |= NG_INVALID; 341 ng_unname(node); /* free name (and its reference) */ 342 IFP2NG(ifp) = NULL; /* detach node from interface */ 343 priv = node->private; /* free node private info */ 344 bzero(priv, sizeof(*priv)); 345 FREE(priv, M_NETGRAPH); 346 node->private = NULL; 347 ng_unref(node); /* free node itself */ 348 } 349 350 /* 351 * Optimization for gluing the Ethernet header back onto 352 * the front of an incoming packet. 353 */ 354 static int 355 ng_ether_glueback_header(struct mbuf **mp, const struct ether_header *eh) 356 { 357 struct mbuf *m = *mp; 358 int error = 0; 359 360 /* 361 * Optimize for the case where the header is already in place 362 * at the front of the mbuf. This is actually quite likely 363 * because many Ethernet drivers generate packets this way. 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 /* Prepend the header back onto the front of the mbuf */ 373 M_PREPEND(m, sizeof(*eh), MB_DONTWAIT); 374 if (m == NULL) { 375 error = ENOBUFS; 376 goto done; 377 } 378 379 /* Copy header into front of mbuf */ 380 bcopy(eh, mtod(m, void *), sizeof(*eh)); 381 382 done: 383 /* Done */ 384 *mp = m; 385 return error; 386 } 387 388 /****************************************************************** 389 NETGRAPH NODE METHODS 390 ******************************************************************/ 391 392 /* 393 * It is not possible or allowable to create a node of this type. 394 * Nodes get created when the interface is attached (or, when 395 * this node type's KLD is loaded). 396 */ 397 static int 398 ng_ether_constructor(node_p *nodep) 399 { 400 return (EINVAL); 401 } 402 403 /* 404 * Check for attaching a new hook. 405 */ 406 static int 407 ng_ether_newhook(node_p node, hook_p hook, const char *name) 408 { 409 const priv_p priv = node->private; 410 u_char orphan = priv->lowerOrphan; 411 hook_p *hookptr; 412 413 /* Divert hook is an alias for lower */ 414 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 415 name = NG_ETHER_HOOK_LOWER; 416 417 /* Which hook? */ 418 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) 419 hookptr = &priv->upper; 420 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 421 hookptr = &priv->lower; 422 orphan = 0; 423 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 424 hookptr = &priv->lower; 425 orphan = 1; 426 } else 427 return (EINVAL); 428 429 /* Check if already connected (shouldn't be, but doesn't hurt) */ 430 if (*hookptr != NULL) 431 return (EISCONN); 432 433 /* Disable hardware checksums while 'upper' hook is connected */ 434 if (hookptr == &priv->upper) 435 priv->ifp->if_hwassist = 0; 436 437 /* OK */ 438 *hookptr = hook; 439 priv->lowerOrphan = orphan; 440 return (0); 441 } 442 443 /* 444 * Receive an incoming control message. 445 */ 446 static int 447 ng_ether_rcvmsg(node_p node, struct ng_mesg *msg, 448 const char *retaddr, struct ng_mesg **rptr) 449 { 450 const priv_p priv = node->private; 451 struct ng_mesg *resp = NULL; 452 int error = 0; 453 454 switch (msg->header.typecookie) { 455 case NGM_ETHER_COOKIE: 456 switch (msg->header.cmd) { 457 case NGM_ETHER_GET_IFNAME: 458 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT); 459 if (resp == NULL) { 460 error = ENOMEM; 461 break; 462 } 463 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 464 break; 465 case NGM_ETHER_GET_IFINDEX: 466 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 467 if (resp == NULL) { 468 error = ENOMEM; 469 break; 470 } 471 *((u_int32_t *)resp->data) = priv->ifp->if_index; 472 break; 473 case NGM_ETHER_GET_ENADDR: 474 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 475 if (resp == NULL) { 476 error = ENOMEM; 477 break; 478 } 479 bcopy((IFP2AC(priv->ifp))->ac_enaddr, 480 resp->data, ETHER_ADDR_LEN); 481 break; 482 case NGM_ETHER_SET_ENADDR: 483 { 484 if (msg->header.arglen != ETHER_ADDR_LEN) { 485 error = EINVAL; 486 break; 487 } 488 error = if_setlladdr(priv->ifp, 489 (u_char *)msg->data, ETHER_ADDR_LEN); 490 break; 491 } 492 case NGM_ETHER_GET_PROMISC: 493 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 494 if (resp == NULL) { 495 error = ENOMEM; 496 break; 497 } 498 *((u_int32_t *)resp->data) = priv->promisc; 499 break; 500 case NGM_ETHER_SET_PROMISC: 501 { 502 u_char want; 503 504 if (msg->header.arglen != sizeof(u_int32_t)) { 505 error = EINVAL; 506 break; 507 } 508 want = !!*((u_int32_t *)msg->data); 509 if (want ^ priv->promisc) { 510 if ((error = ifpromisc(priv->ifp, want)) != 0) 511 break; 512 priv->promisc = want; 513 } 514 break; 515 } 516 case NGM_ETHER_GET_AUTOSRC: 517 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 518 if (resp == NULL) { 519 error = ENOMEM; 520 break; 521 } 522 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 523 break; 524 case NGM_ETHER_SET_AUTOSRC: 525 if (msg->header.arglen != sizeof(u_int32_t)) { 526 error = EINVAL; 527 break; 528 } 529 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 530 break; 531 default: 532 error = EINVAL; 533 break; 534 } 535 break; 536 default: 537 error = EINVAL; 538 break; 539 } 540 if (rptr) 541 *rptr = resp; 542 else if (resp != NULL) 543 FREE(resp, M_NETGRAPH); 544 FREE(msg, M_NETGRAPH); 545 return (error); 546 } 547 548 /* 549 * Receive data on a hook. 550 */ 551 static int 552 ng_ether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 553 { 554 const node_p node = hook->node; 555 const priv_p priv = node->private; 556 557 if (hook == priv->lower) 558 return ng_ether_rcv_lower(node, m, meta); 559 if (hook == priv->upper) 560 return ng_ether_rcv_upper(node, m, meta); 561 panic("%s: weird hook", __func__); 562 } 563 564 /* 565 * Handle an mbuf received on the "lower" hook. 566 */ 567 static int 568 ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta) 569 { 570 const priv_p priv = node->private; 571 struct ifnet *const ifp = priv->ifp; 572 int error; 573 574 /* Discard meta info */ 575 NG_FREE_META(meta); 576 577 /* Check whether interface is ready for packets */ 578 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 579 m_freem(m); 580 return (ENETDOWN); 581 } 582 583 /* Make sure header is fully pulled up */ 584 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 585 m_freem(m); 586 return (EINVAL); 587 } 588 if (m->m_len < sizeof(struct ether_header) 589 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 590 return (ENOBUFS); 591 592 /* Drop in the MAC address if desired */ 593 if (priv->autoSrcAddr) { 594 595 /* Make the mbuf writable if it's not already */ 596 if (!M_WRITABLE(m) 597 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 598 return (ENOBUFS); 599 600 /* Overwrite source MAC address */ 601 bcopy((IFP2AC(ifp))->ac_enaddr, 602 mtod(m, struct ether_header *)->ether_shost, 603 ETHER_ADDR_LEN); 604 } 605 606 /* Send it on its way */ 607 error = ether_output_frame(ifp, m); 608 return (error); 609 } 610 611 /* 612 * Handle an mbuf received on the "upper" hook. 613 */ 614 static int 615 ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta) 616 { 617 const priv_p priv = node->private; 618 619 /* Discard meta info */ 620 NG_FREE_META(meta); 621 622 /* Check length and pull off header */ 623 if (m->m_pkthdr.len < ETHER_HDR_LEN) { 624 m_freem(m); 625 return (EINVAL); 626 } 627 if (m->m_len < ETHER_HDR_LEN && 628 (m = m_pullup(m, ETHER_HDR_LEN)) == NULL) 629 return (ENOBUFS); 630 631 m->m_pkthdr.rcvif = priv->ifp; 632 633 /* 634 * XXX 635 * Since frame processing is run in netisr0, 636 * 'm' may _not_ even on its target CPU. 637 */ 638 /* Route packet back in */ 639 ether_demux_oncpu(priv->ifp, m); 640 return (0); 641 } 642 643 /* 644 * Shutdown node. This resets the node but does not remove it. 645 */ 646 static int 647 ng_ether_rmnode(node_p node) 648 { 649 const priv_p priv = node->private; 650 651 ng_cutlinks(node); 652 node->flags &= ~NG_INVALID; /* bounce back to life */ 653 if (priv->promisc) { /* disable promiscuous mode */ 654 ifpromisc(priv->ifp, 0); 655 priv->promisc = 0; 656 } 657 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 658 return (0); 659 } 660 661 /* 662 * Hook disconnection. 663 */ 664 static int 665 ng_ether_disconnect(hook_p hook) 666 { 667 const priv_p priv = hook->node->private; 668 669 if (hook == priv->upper) { 670 priv->upper = NULL; 671 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */ 672 } else if (hook == priv->lower) { 673 priv->lower = NULL; 674 priv->lowerOrphan = 0; 675 } else 676 panic("%s: weird hook", __func__); 677 if (hook->node->numhooks == 0) 678 ng_rmnode(hook->node); /* reset node */ 679 return (0); 680 } 681 682 static int 683 ng_enaddr_parse(const struct ng_parse_type *type, 684 const char *s, int *const off, const u_char *const start, 685 u_char *const buf, int *const buflen) 686 { 687 char *eptr; 688 u_long val; 689 int i; 690 691 if (*buflen < ETHER_ADDR_LEN) 692 return (ERANGE); 693 for (i = 0; i < ETHER_ADDR_LEN; i++) { 694 val = strtoul(s + *off, &eptr, 16); 695 if (val > 0xff || eptr == s + *off) 696 return (EINVAL); 697 buf[i] = (u_char)val; 698 *off = (eptr - s); 699 if (i < ETHER_ADDR_LEN - 1) { 700 if (*eptr != ':') 701 return (EINVAL); 702 (*off)++; 703 } 704 } 705 *buflen = ETHER_ADDR_LEN; 706 return (0); 707 } 708 709 static int 710 ng_enaddr_unparse(const struct ng_parse_type *type, 711 const u_char *data, int *off, char *cbuf, int cbuflen) 712 { 713 int len; 714 715 len = ksnprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x", 716 data[*off], data[*off + 1], data[*off + 2], 717 data[*off + 3], data[*off + 4], data[*off + 5]); 718 if (len >= cbuflen) 719 return (ERANGE); 720 *off += ETHER_ADDR_LEN; 721 return (0); 722 } 723 724 /****************************************************************** 725 INITIALIZATION 726 ******************************************************************/ 727 728 /* 729 * Handle loading and unloading for this node type. 730 */ 731 static int 732 ng_ether_mod_event(module_t mod, int event, void *data) 733 { 734 struct ifnet *ifp; 735 int error = 0; 736 737 crit_enter(); 738 switch (event) { 739 case MOD_LOAD: 740 741 /* Register function hooks */ 742 if (ng_ether_attach_p != NULL) { 743 error = EEXIST; 744 break; 745 } 746 ng_ether_attach_p = ng_ether_attach; 747 ng_ether_detach_p = ng_ether_detach; 748 ng_ether_output_p = ng_ether_output; 749 ng_ether_input_p = ng_ether_input; 750 ng_ether_input_orphan_p = ng_ether_input_orphan; 751 752 /* Create nodes for any already-existing Ethernet interfaces */ 753 TAILQ_FOREACH(ifp, &ifnet, if_link) { 754 if (ifp->if_type == IFT_ETHER || 755 ifp->if_type == IFT_L2VLAN) 756 ng_ether_attach(ifp); 757 } 758 break; 759 760 case MOD_UNLOAD: 761 762 /* 763 * Note that the base code won't try to unload us until 764 * all nodes have been removed, and that can't happen 765 * until all Ethernet interfaces are removed. In any 766 * case, we know there are no nodes left if the action 767 * is MOD_UNLOAD, so there's no need to detach any nodes. 768 */ 769 770 /* Unregister function hooks */ 771 ng_ether_attach_p = NULL; 772 ng_ether_detach_p = NULL; 773 ng_ether_output_p = NULL; 774 ng_ether_input_p = NULL; 775 ng_ether_input_orphan_p = NULL; 776 break; 777 778 default: 779 error = EOPNOTSUPP; 780 break; 781 } 782 crit_exit(); 783 return (error); 784 } 785 786