1 2/* 3 * ng_ether.c 4 */ 5 6/*- 7 * Copyright (c) 1996-2000 Whistle Communications, Inc. 8 * All rights reserved. 9 * 10 * Subject to the following obligations and disclaimer of warranty, use and 11 * redistribution of this software, in source or object code forms, with or 12 * without modifications are expressly permitted by Whistle Communications; 13 * provided, however, that: 14 * 1. Any and all reproductions of the source or object code must include the 15 * copyright notice above and the following disclaimer of warranties; and 16 * 2. No rights are granted, in any manner or form, to use Whistle 17 * Communications, Inc. trademarks, including the mark "WHISTLE 18 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 19 * such appears in the above copyright notice or in the software. 20 * 21 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 22 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 23 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 24 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 26 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 27 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 28 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 29 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 30 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 31 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 32 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 33 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 36 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 37 * OF SUCH DAMAGE. 38 * 39 * Authors: Archie Cobbs <archie@freebsd.org> 40 * Julian Elischer <julian@freebsd.org> 41 */ 42 43/* 44 * ng_ether(4) netgraph node type 45 */ 46 47#include <sys/param.h> 48#include <sys/eventhandler.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/proc.h> 55#include <sys/syslog.h> 56#include <sys/socket.h> 57#include <sys/taskqueue.h> 58 59#include <net/if.h> 60#include <net/if_dl.h> 61#include <net/if_types.h> 62#include <net/if_arp.h> 63#include <net/if_var.h> 64#include <net/if_private.h> 65#include <net/ethernet.h> 66#include <net/if_bridgevar.h> 67#include <net/vnet.h> 68 69#include <netgraph/ng_message.h> 70#include <netgraph/netgraph.h> 71#include <netgraph/ng_parse.h> 72#include <netgraph/ng_ether.h> 73 74MODULE_VERSION(ng_ether, 1); 75 76#define IFP2NG(ifp) ((ifp)->if_l2com) 77 78/* Per-node private data */ 79struct private { 80 struct ifnet *ifp; /* associated interface */ 81 hook_p upper; /* upper hook connection */ 82 hook_p lower; /* lower hook connection */ 83 hook_p orphan; /* orphan hook connection */ 84 u_char autoSrcAddr; /* always overwrite source address */ 85 u_char promisc; /* promiscuous mode enabled */ 86 u_long hwassist; /* hardware checksum capabilities */ 87 u_int flags; /* flags e.g. really die */ 88}; 89typedef struct private *priv_p; 90 91/* Hook pointers used by if_ethersubr.c to callback to netgraph */ 92extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 93extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 94extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 95extern void (*ng_ether_attach_p)(struct ifnet *ifp); 96extern void (*ng_ether_detach_p)(struct ifnet *ifp); 97extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 98 99/* Functional hooks called from if_ethersubr.c */ 100static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 101static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 102static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 103static void ng_ether_attach(struct ifnet *ifp); 104static void ng_ether_detach(struct ifnet *ifp); 105static void ng_ether_link_state(struct ifnet *ifp, int state); 106 107/* Other functions */ 108static int ng_ether_rcv_lower(hook_p node, item_p item); 109static int ng_ether_rcv_upper(hook_p node, item_p item); 110 111/* Netgraph node methods */ 112static ng_constructor_t ng_ether_constructor; 113static ng_rcvmsg_t ng_ether_rcvmsg; 114static ng_shutdown_t ng_ether_shutdown; 115static ng_newhook_t ng_ether_newhook; 116static ng_rcvdata_t ng_ether_rcvdata; 117static ng_disconnect_t ng_ether_disconnect; 118static int ng_ether_mod_event(module_t mod, int event, void *data); 119 120static eventhandler_tag ng_ether_ifnet_arrival_cookie; 121 122/* List of commands and how to convert arguments to/from ASCII */ 123static 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_parse_enaddr_type 144 }, 145 { 146 NGM_ETHER_COOKIE, 147 NGM_ETHER_SET_ENADDR, 148 "setenaddr", 149 &ng_parse_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 { 181 NGM_ETHER_COOKIE, 182 NGM_ETHER_ADD_MULTI, 183 "addmulti", 184 &ng_parse_enaddr_type, 185 NULL 186 }, 187 { 188 NGM_ETHER_COOKIE, 189 NGM_ETHER_DEL_MULTI, 190 "delmulti", 191 &ng_parse_enaddr_type, 192 NULL 193 }, 194 { 195 NGM_ETHER_COOKIE, 196 NGM_ETHER_DETACH, 197 "detach", 198 NULL, 199 NULL 200 }, 201 { 0 } 202}; 203 204static struct ng_type ng_ether_typestruct = { 205 .version = NG_ABI_VERSION, 206 .name = NG_ETHER_NODE_TYPE, 207 .mod_event = ng_ether_mod_event, 208 .constructor = ng_ether_constructor, 209 .rcvmsg = ng_ether_rcvmsg, 210 .shutdown = ng_ether_shutdown, 211 .newhook = ng_ether_newhook, 212 .rcvdata = ng_ether_rcvdata, 213 .disconnect = ng_ether_disconnect, 214 .cmdlist = ng_ether_cmdlist, 215}; 216NETGRAPH_INIT(ether, &ng_ether_typestruct); 217 218/****************************************************************** 219 UTILITY FUNCTIONS 220******************************************************************/ 221static void 222ng_ether_sanitize_ifname(const char *ifname, char *name) 223{ 224 int i; 225 226 for (i = 0; i < IFNAMSIZ; i++) { 227 if (ifname[i] == '.' || ifname[i] == ':') 228 name[i] = '_'; 229 else 230 name[i] = ifname[i]; 231 if (name[i] == '\0') 232 break; 233 } 234} 235 236/****************************************************************** 237 ETHERNET FUNCTION HOOKS 238******************************************************************/ 239 240/* 241 * Handle a packet that has come in on an interface. We get to 242 * look at it here before any upper layer protocols do. 243 */ 244static void 245ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 246{ 247 const node_p node = IFP2NG(ifp); 248 const priv_p priv = NG_NODE_PRIVATE(node); 249 int error; 250 251 /* If "lower" hook not connected, let packet continue */ 252 if (priv->lower == NULL) 253 return; 254 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 255} 256 257/* 258 * Handle a packet that has come in on an interface, and which 259 * does not match any of our known protocols (an ``orphan''). 260 */ 261static void 262ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 263{ 264 const node_p node = IFP2NG(ifp); 265 const priv_p priv = NG_NODE_PRIVATE(node); 266 int error; 267 268 /* If "orphan" hook not connected, discard packet */ 269 if (priv->orphan == NULL) { 270 m_freem(m); 271 return; 272 } 273 NG_SEND_DATA_ONLY(error, priv->orphan, m); 274} 275 276/* 277 * Handle a packet that is going out on an interface. 278 * The Ethernet header is already attached to the mbuf. 279 */ 280static int 281ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 282{ 283 const node_p node = IFP2NG(ifp); 284 const priv_p priv = NG_NODE_PRIVATE(node); 285 int error = 0; 286 287 /* If "upper" hook not connected, let packet continue */ 288 if (priv->upper == NULL) 289 return (0); 290 291 /* Send it out "upper" hook */ 292 NG_OUTBOUND_THREAD_REF(); 293 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 294 NG_OUTBOUND_THREAD_UNREF(); 295 return (error); 296} 297 298/* 299 * A new Ethernet interface has been attached. 300 * Create a new node for it, etc. 301 */ 302static void 303ng_ether_attach(struct ifnet *ifp) 304{ 305 char name[IFNAMSIZ]; 306 priv_p priv; 307 node_p node; 308 309 /* 310 * Do not create / attach an ether node to this ifnet if 311 * a netgraph node with the same name already exists. 312 * This should prevent ether nodes to become attached to 313 * eiface nodes, which may be problematic due to naming 314 * clashes. 315 */ 316 ng_ether_sanitize_ifname(ifp->if_xname, name); 317 if ((node = ng_name2noderef(NULL, name)) != NULL) { 318 NG_NODE_UNREF(node); 319 return; 320 } 321 322 /* Create node */ 323 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 324 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 325 log(LOG_ERR, "%s: can't %s for %s\n", 326 __func__, "create node", ifp->if_xname); 327 return; 328 } 329 330 /* Allocate private data */ 331 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 332 if (priv == NULL) { 333 log(LOG_ERR, "%s: can't %s for %s\n", 334 __func__, "allocate memory", ifp->if_xname); 335 NG_NODE_UNREF(node); 336 return; 337 } 338 NG_NODE_SET_PRIVATE(node, priv); 339 priv->ifp = ifp; 340 IFP2NG(ifp) = node; 341 priv->hwassist = ifp->if_hwassist; 342 343 /* Try to give the node the same name as the interface */ 344 if (ng_name_node(node, name) != 0) 345 log(LOG_WARNING, "%s: can't name node %s\n", __func__, name); 346} 347 348/* 349 * An Ethernet interface is being detached. 350 * REALLY Destroy its node. 351 */ 352static void 353ng_ether_detach(struct ifnet *ifp) 354{ 355 const node_p node = IFP2NG(ifp); 356 const priv_p priv = NG_NODE_PRIVATE(node); 357 358 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 359 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 360 /* 361 * We can't assume the ifnet is still around when we run shutdown 362 * So zap it now. XXX We HOPE that anything running at this time 363 * handles it (as it should in the non netgraph case). 364 */ 365 IFP2NG(ifp) = NULL; 366 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 367 ng_rmnode_self(node); /* remove all netgraph parts */ 368} 369 370/* 371 * Notify graph about link event. 372 * if_link_state_change() has already checked that the state has changed. 373 */ 374static void 375ng_ether_link_state(struct ifnet *ifp, int state) 376{ 377 const node_p node = IFP2NG(ifp); 378 const priv_p priv = NG_NODE_PRIVATE(node); 379 struct ng_mesg *msg; 380 int cmd, dummy_error = 0; 381 382 if (state == LINK_STATE_UP) 383 cmd = NGM_LINK_IS_UP; 384 else if (state == LINK_STATE_DOWN) 385 cmd = NGM_LINK_IS_DOWN; 386 else 387 return; 388 389 if (priv->lower != NULL) { 390 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 391 if (msg != NULL) 392 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 393 } 394 if (priv->orphan != NULL) { 395 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 396 if (msg != NULL) 397 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0); 398 } 399} 400 401/* 402 * Interface arrival notification handler. 403 * The notification is produced in two cases: 404 * o a new interface arrives 405 * o an existing interface got renamed 406 * Currently the first case is handled by ng_ether_attach via special 407 * hook ng_ether_attach_p. 408 */ 409static void 410ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp) 411{ 412 char name[IFNAMSIZ]; 413 node_p node; 414 415 /* Only ethernet interfaces are of interest. */ 416 if (ifp->if_type != IFT_ETHER && 417 ifp->if_type != IFT_L2VLAN && 418 ifp->if_type != IFT_BRIDGE) 419 return; 420 421 /* 422 * Just return if it's a new interface without an ng_ether companion. 423 */ 424 node = IFP2NG(ifp); 425 if (node == NULL) 426 return; 427 428 /* Try to give the node the same name as the new interface name */ 429 ng_ether_sanitize_ifname(ifp->if_xname, name); 430 if (ng_name_node(node, name) != 0) 431 log(LOG_WARNING, "%s: can't re-name node %s\n", __func__, name); 432} 433 434/****************************************************************** 435 NETGRAPH NODE METHODS 436******************************************************************/ 437 438/* 439 * It is not possible or allowable to create a node of this type. 440 * Nodes get created when the interface is attached (or, when 441 * this node type's KLD is loaded). 442 */ 443static int 444ng_ether_constructor(node_p node) 445{ 446 return (EINVAL); 447} 448 449/* 450 * Check for attaching a new hook. 451 */ 452static int 453ng_ether_newhook(node_p node, hook_p hook, const char *name) 454{ 455 const priv_p priv = NG_NODE_PRIVATE(node); 456 hook_p *hookptr; 457 458 /* Divert hook is an alias for lower */ 459 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 460 name = NG_ETHER_HOOK_LOWER; 461 462 /* Which hook? */ 463 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) { 464 hookptr = &priv->upper; 465 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper); 466 NG_HOOK_SET_TO_INBOUND(hook); 467 } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 468 hookptr = &priv->lower; 469 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower); 470 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 471 hookptr = &priv->orphan; 472 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower); 473 } else 474 return (EINVAL); 475 476 /* Check if already connected (shouldn't be, but doesn't hurt) */ 477 if (*hookptr != NULL) 478 return (EISCONN); 479 480 /* Disable hardware checksums while 'upper' hook is connected */ 481 if (hookptr == &priv->upper) 482 priv->ifp->if_hwassist = 0; 483 NG_HOOK_HI_STACK(hook); 484 /* OK */ 485 *hookptr = hook; 486 return (0); 487} 488 489/* 490 * Receive an incoming control message. 491 */ 492static int 493ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 494{ 495 const priv_p priv = NG_NODE_PRIVATE(node); 496 struct ng_mesg *resp = NULL; 497 int error = 0; 498 struct ng_mesg *msg; 499 500 NGI_GET_MSG(item, msg); 501 switch (msg->header.typecookie) { 502 case NGM_ETHER_COOKIE: 503 switch (msg->header.cmd) { 504 case NGM_ETHER_GET_IFNAME: 505 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 506 if (resp == NULL) { 507 error = ENOMEM; 508 break; 509 } 510 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 511 break; 512 case NGM_ETHER_GET_IFINDEX: 513 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 514 if (resp == NULL) { 515 error = ENOMEM; 516 break; 517 } 518 *((u_int32_t *)resp->data) = priv->ifp->if_index; 519 break; 520 case NGM_ETHER_GET_ENADDR: 521 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 522 if (resp == NULL) { 523 error = ENOMEM; 524 break; 525 } 526 bcopy(IF_LLADDR(priv->ifp), 527 resp->data, ETHER_ADDR_LEN); 528 break; 529 case NGM_ETHER_SET_ENADDR: 530 { 531 if (msg->header.arglen != ETHER_ADDR_LEN) { 532 error = EINVAL; 533 break; 534 } 535 error = if_setlladdr(priv->ifp, 536 (u_char *)msg->data, ETHER_ADDR_LEN); 537 break; 538 } 539 case NGM_ETHER_GET_PROMISC: 540 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 541 if (resp == NULL) { 542 error = ENOMEM; 543 break; 544 } 545 *((u_int32_t *)resp->data) = priv->promisc; 546 break; 547 case NGM_ETHER_SET_PROMISC: 548 { 549 u_char want; 550 551 if (msg->header.arglen != sizeof(u_int32_t)) { 552 error = EINVAL; 553 break; 554 } 555 want = !!*((u_int32_t *)msg->data); 556 if (want ^ priv->promisc) { 557 if ((error = ifpromisc(priv->ifp, want)) != 0) 558 break; 559 priv->promisc = want; 560 } 561 break; 562 } 563 case NGM_ETHER_GET_AUTOSRC: 564 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 565 if (resp == NULL) { 566 error = ENOMEM; 567 break; 568 } 569 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 570 break; 571 case NGM_ETHER_SET_AUTOSRC: 572 if (msg->header.arglen != sizeof(u_int32_t)) { 573 error = EINVAL; 574 break; 575 } 576 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 577 break; 578 case NGM_ETHER_ADD_MULTI: 579 { 580 struct sockaddr_dl sa_dl; 581 struct epoch_tracker et; 582 struct ifmultiaddr *ifma; 583 584 if (msg->header.arglen != ETHER_ADDR_LEN) { 585 error = EINVAL; 586 break; 587 } 588 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 589 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 590 sa_dl.sdl_family = AF_LINK; 591 sa_dl.sdl_alen = ETHER_ADDR_LEN; 592 bcopy((void *)msg->data, LLADDR(&sa_dl), 593 ETHER_ADDR_LEN); 594 /* 595 * Netgraph is only permitted to join groups once 596 * via the if_addmulti() KPI, because it cannot hold 597 * struct ifmultiaddr * between calls. It may also 598 * lose a race while we check if the membership 599 * already exists. 600 */ 601 NET_EPOCH_ENTER(et); 602 ifma = if_findmulti(priv->ifp, 603 (struct sockaddr *)&sa_dl); 604 NET_EPOCH_EXIT(et); 605 if (ifma != NULL) { 606 error = EADDRINUSE; 607 } else { 608 error = if_addmulti(priv->ifp, 609 (struct sockaddr *)&sa_dl, &ifma); 610 } 611 break; 612 } 613 case NGM_ETHER_DEL_MULTI: 614 { 615 struct sockaddr_dl sa_dl; 616 617 if (msg->header.arglen != ETHER_ADDR_LEN) { 618 error = EINVAL; 619 break; 620 } 621 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 622 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 623 sa_dl.sdl_family = AF_LINK; 624 sa_dl.sdl_alen = ETHER_ADDR_LEN; 625 bcopy((void *)msg->data, LLADDR(&sa_dl), 626 ETHER_ADDR_LEN); 627 error = if_delmulti(priv->ifp, 628 (struct sockaddr *)&sa_dl); 629 break; 630 } 631 case NGM_ETHER_DETACH: 632 ng_ether_detach(priv->ifp); 633 break; 634 default: 635 error = EINVAL; 636 break; 637 } 638 break; 639 default: 640 error = EINVAL; 641 break; 642 } 643 NG_RESPOND_MSG(error, node, item, resp); 644 NG_FREE_MSG(msg); 645 return (error); 646} 647 648/* 649 * Receive data on a hook. 650 * Since we use per-hook recveive methods this should never be called. 651 */ 652static int 653ng_ether_rcvdata(hook_p hook, item_p item) 654{ 655 NG_FREE_ITEM(item); 656 657 panic("%s: weird hook", __func__); 658} 659 660/* 661 * Handle an mbuf received on the "lower" or "orphan" hook. 662 */ 663static int 664ng_ether_rcv_lower(hook_p hook, item_p item) 665{ 666 struct mbuf *m; 667 const node_p node = NG_HOOK_NODE(hook); 668 const priv_p priv = NG_NODE_PRIVATE(node); 669 struct ifnet *const ifp = priv->ifp; 670 671 NGI_GET_M(item, m); 672 NG_FREE_ITEM(item); 673 674 /* Check whether interface is ready for packets */ 675 676 if (!((ifp->if_flags & IFF_UP) && 677 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 678 NG_FREE_M(m); 679 return (ENETDOWN); 680 } 681 682 /* Make sure header is fully pulled up */ 683 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 684 NG_FREE_M(m); 685 return (EINVAL); 686 } 687 if (m->m_len < sizeof(struct ether_header) 688 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 689 return (ENOBUFS); 690 691 /* Drop in the MAC address if desired */ 692 if (priv->autoSrcAddr) { 693 /* Make the mbuf writable if it's not already */ 694 if (!M_WRITABLE(m) 695 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 696 return (ENOBUFS); 697 698 /* Overwrite source MAC address */ 699 bcopy(IF_LLADDR(ifp), 700 mtod(m, struct ether_header *)->ether_shost, 701 ETHER_ADDR_LEN); 702 } 703 704 /* Send it on its way */ 705 return ether_output_frame(ifp, m); 706} 707 708/* 709 * Handle an mbuf received on the "upper" hook. 710 */ 711static int 712ng_ether_rcv_upper(hook_p hook, item_p item) 713{ 714 struct mbuf *m; 715 const node_p node = NG_HOOK_NODE(hook); 716 const priv_p priv = NG_NODE_PRIVATE(node); 717 struct ifnet *ifp = priv->ifp; 718 719 NGI_GET_M(item, m); 720 NG_FREE_ITEM(item); 721 722 /* Check length and pull off header */ 723 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 724 NG_FREE_M(m); 725 return (EINVAL); 726 } 727 if (m->m_len < sizeof(struct ether_header) && 728 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 729 return (ENOBUFS); 730 731 m->m_pkthdr.rcvif = ifp; 732 733 /* Pass the packet to the bridge, it may come back to us */ 734 if (ifp->if_bridge) { 735 BRIDGE_INPUT(ifp, m); 736 if (m == NULL) 737 return (0); 738 } 739 740 /* Route packet back in */ 741 ether_demux(ifp, m); 742 return (0); 743} 744 745/* 746 * Shutdown node. This resets the node but does not remove it 747 * unless the REALLY_DIE flag is set. 748 */ 749static int 750ng_ether_shutdown(node_p node) 751{ 752 const priv_p priv = NG_NODE_PRIVATE(node); 753 754 if (node->nd_flags & NGF_REALLY_DIE) { 755 /* 756 * The ifnet is going away, perhaps because the driver was 757 * unloaded or its vnet is being torn down. 758 */ 759 NG_NODE_SET_PRIVATE(node, NULL); 760 if (priv->ifp != NULL) 761 IFP2NG(priv->ifp) = NULL; 762 free(priv, M_NETGRAPH); 763 NG_NODE_UNREF(node); /* free node itself */ 764 return (0); 765 } 766 if (priv->promisc) { /* disable promiscuous mode */ 767 (void)ifpromisc(priv->ifp, 0); 768 priv->promisc = 0; 769 } 770 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 771 772 return (0); 773} 774 775/* 776 * Hook disconnection. 777 */ 778static int 779ng_ether_disconnect(hook_p hook) 780{ 781 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 782 783 if (hook == priv->upper) { 784 priv->upper = NULL; 785 if (priv->ifp != NULL) /* restore h/w csum */ 786 priv->ifp->if_hwassist = priv->hwassist; 787 } else if (hook == priv->lower) 788 priv->lower = NULL; 789 else if (hook == priv->orphan) 790 priv->orphan = NULL; 791 else 792 panic("%s: weird hook", __func__); 793 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 794 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 795 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 796 return (0); 797} 798 799/****************************************************************** 800 INITIALIZATION 801******************************************************************/ 802 803/* 804 * Handle loading and unloading for this node type. 805 */ 806static int 807ng_ether_mod_event(module_t mod, int event, void *data) 808{ 809 int error = 0; 810 811 switch (event) { 812 case MOD_LOAD: 813 814 /* Register function hooks */ 815 if (ng_ether_attach_p != NULL) { 816 error = EEXIST; 817 break; 818 } 819 ng_ether_attach_p = ng_ether_attach; 820 ng_ether_detach_p = ng_ether_detach; 821 ng_ether_output_p = ng_ether_output; 822 ng_ether_input_p = ng_ether_input; 823 ng_ether_input_orphan_p = ng_ether_input_orphan; 824 ng_ether_link_state_p = ng_ether_link_state; 825 826 ng_ether_ifnet_arrival_cookie = 827 EVENTHANDLER_REGISTER(ifnet_arrival_event, 828 ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY); 829 break; 830 831 case MOD_UNLOAD: 832 833 /* 834 * Note that the base code won't try to unload us until 835 * all nodes have been removed, and that can't happen 836 * until all Ethernet interfaces are removed. In any 837 * case, we know there are no nodes left if the action 838 * is MOD_UNLOAD, so there's no need to detach any nodes. 839 */ 840 841 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, 842 ng_ether_ifnet_arrival_cookie); 843 844 /* Unregister function hooks */ 845 ng_ether_attach_p = NULL; 846 ng_ether_detach_p = NULL; 847 ng_ether_output_p = NULL; 848 ng_ether_input_p = NULL; 849 ng_ether_input_orphan_p = NULL; 850 ng_ether_link_state_p = NULL; 851 break; 852 853 default: 854 error = EOPNOTSUPP; 855 break; 856 } 857 return (error); 858} 859 860static void 861vnet_ng_ether_init(const void *unused) 862{ 863 struct ifnet *ifp; 864 865 /* If module load was rejected, don't attach to vnets. */ 866 if (ng_ether_attach_p != ng_ether_attach) 867 return; 868 869 /* Create nodes for any already-existing Ethernet interfaces. */ 870 IFNET_RLOCK(); 871 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 872 if (ifp->if_type == IFT_ETHER || 873 ifp->if_type == IFT_L2VLAN || 874 ifp->if_type == IFT_BRIDGE) 875 ng_ether_attach(ifp); 876 } 877 IFNET_RUNLOCK(); 878} 879VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 880 vnet_ng_ether_init, NULL); 881