ng_ether.c revision 223469
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 * $FreeBSD: head/sys/netgraph/ng_ether.c 223469 2011-06-23 09:42:41Z glebius $ 43 */ 44 45/* 46 * ng_ether(4) netgraph node type 47 */ 48 49#include <sys/param.h> 50#include <sys/systm.h> 51#include <sys/kernel.h> 52#include <sys/malloc.h> 53#include <sys/mbuf.h> 54#include <sys/errno.h> 55#include <sys/proc.h> 56#include <sys/syslog.h> 57#include <sys/socket.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/ethernet.h> 65#include <net/if_bridgevar.h> 66#include <net/vnet.h> 67 68#include <netgraph/ng_message.h> 69#include <netgraph/netgraph.h> 70#include <netgraph/ng_parse.h> 71#include <netgraph/ng_ether.h> 72 73#define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph) 74 75/* Per-node private data */ 76struct private { 77 struct ifnet *ifp; /* associated interface */ 78 hook_p upper; /* upper hook connection */ 79 hook_p lower; /* lower hook connection */ 80 hook_p orphan; /* orphan hook connection */ 81 u_char autoSrcAddr; /* always overwrite source address */ 82 u_char promisc; /* promiscuous mode enabled */ 83 u_long hwassist; /* hardware checksum capabilities */ 84 u_int flags; /* flags e.g. really die */ 85}; 86typedef struct private *priv_p; 87 88/* Hook pointers used by if_ethersubr.c to callback to netgraph */ 89extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 90extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 91extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 92extern void (*ng_ether_attach_p)(struct ifnet *ifp); 93extern void (*ng_ether_detach_p)(struct ifnet *ifp); 94extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 95 96/* Functional hooks called from if_ethersubr.c */ 97static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 98static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 99static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 100static void ng_ether_attach(struct ifnet *ifp); 101static void ng_ether_detach(struct ifnet *ifp); 102static void ng_ether_link_state(struct ifnet *ifp, int state); 103 104/* Other functions */ 105static int ng_ether_rcv_lower(hook_p node, item_p item); 106static int ng_ether_rcv_upper(hook_p node, item_p item); 107 108/* Netgraph node methods */ 109static ng_constructor_t ng_ether_constructor; 110static ng_rcvmsg_t ng_ether_rcvmsg; 111static ng_shutdown_t ng_ether_shutdown; 112static ng_newhook_t ng_ether_newhook; 113static ng_rcvdata_t ng_ether_rcvdata; 114static ng_disconnect_t ng_ether_disconnect; 115static int ng_ether_mod_event(module_t mod, int event, void *data); 116 117/* List of commands and how to convert arguments to/from ASCII */ 118static const struct ng_cmdlist ng_ether_cmdlist[] = { 119 { 120 NGM_ETHER_COOKIE, 121 NGM_ETHER_GET_IFNAME, 122 "getifname", 123 NULL, 124 &ng_parse_string_type 125 }, 126 { 127 NGM_ETHER_COOKIE, 128 NGM_ETHER_GET_IFINDEX, 129 "getifindex", 130 NULL, 131 &ng_parse_int32_type 132 }, 133 { 134 NGM_ETHER_COOKIE, 135 NGM_ETHER_GET_ENADDR, 136 "getenaddr", 137 NULL, 138 &ng_parse_enaddr_type 139 }, 140 { 141 NGM_ETHER_COOKIE, 142 NGM_ETHER_SET_ENADDR, 143 "setenaddr", 144 &ng_parse_enaddr_type, 145 NULL 146 }, 147 { 148 NGM_ETHER_COOKIE, 149 NGM_ETHER_GET_PROMISC, 150 "getpromisc", 151 NULL, 152 &ng_parse_int32_type 153 }, 154 { 155 NGM_ETHER_COOKIE, 156 NGM_ETHER_SET_PROMISC, 157 "setpromisc", 158 &ng_parse_int32_type, 159 NULL 160 }, 161 { 162 NGM_ETHER_COOKIE, 163 NGM_ETHER_GET_AUTOSRC, 164 "getautosrc", 165 NULL, 166 &ng_parse_int32_type 167 }, 168 { 169 NGM_ETHER_COOKIE, 170 NGM_ETHER_SET_AUTOSRC, 171 "setautosrc", 172 &ng_parse_int32_type, 173 NULL 174 }, 175 { 176 NGM_ETHER_COOKIE, 177 NGM_ETHER_ADD_MULTI, 178 "addmulti", 179 &ng_parse_enaddr_type, 180 NULL 181 }, 182 { 183 NGM_ETHER_COOKIE, 184 NGM_ETHER_DEL_MULTI, 185 "delmulti", 186 &ng_parse_enaddr_type, 187 NULL 188 }, 189 { 190 NGM_ETHER_COOKIE, 191 NGM_ETHER_DETACH, 192 "detach", 193 NULL, 194 NULL 195 }, 196 { 0 } 197}; 198 199static struct ng_type ng_ether_typestruct = { 200 .version = NG_ABI_VERSION, 201 .name = NG_ETHER_NODE_TYPE, 202 .mod_event = ng_ether_mod_event, 203 .constructor = ng_ether_constructor, 204 .rcvmsg = ng_ether_rcvmsg, 205 .shutdown = ng_ether_shutdown, 206 .newhook = ng_ether_newhook, 207 .rcvdata = ng_ether_rcvdata, 208 .disconnect = ng_ether_disconnect, 209 .cmdlist = ng_ether_cmdlist, 210}; 211NETGRAPH_INIT(ether, &ng_ether_typestruct); 212 213/****************************************************************** 214 ETHERNET FUNCTION HOOKS 215******************************************************************/ 216 217/* 218 * Handle a packet that has come in on an interface. We get to 219 * look at it here before any upper layer protocols do. 220 * 221 * NOTE: this function will get called at splimp() 222 */ 223static void 224ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 225{ 226 const node_p node = IFP2NG(ifp); 227 const priv_p priv = NG_NODE_PRIVATE(node); 228 int error; 229 230 /* If "lower" hook not connected, let packet continue */ 231 if (priv->lower == NULL) 232 return; 233 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 234} 235 236/* 237 * Handle a packet that has come in on an interface, and which 238 * does not match any of our known protocols (an ``orphan''). 239 * 240 * NOTE: this function will get called at splimp() 241 */ 242static void 243ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 244{ 245 const node_p node = IFP2NG(ifp); 246 const priv_p priv = NG_NODE_PRIVATE(node); 247 int error; 248 249 /* If "orphan" hook not connected, discard packet */ 250 if (priv->orphan == NULL) { 251 m_freem(m); 252 return; 253 } 254 NG_SEND_DATA_ONLY(error, priv->orphan, m); 255} 256 257/* 258 * Handle a packet that is going out on an interface. 259 * The Ethernet header is already attached to the mbuf. 260 */ 261static int 262ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 263{ 264 const node_p node = IFP2NG(ifp); 265 const priv_p priv = NG_NODE_PRIVATE(node); 266 int error = 0; 267 268 /* If "upper" hook not connected, let packet continue */ 269 if (priv->upper == NULL) 270 return (0); 271 272 /* Send it out "upper" hook */ 273 NG_OUTBOUND_THREAD_REF(); 274 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 275 NG_OUTBOUND_THREAD_UNREF(); 276 return (error); 277} 278 279/* 280 * A new Ethernet interface has been attached. 281 * Create a new node for it, etc. 282 */ 283static void 284ng_ether_attach(struct ifnet *ifp) 285{ 286 priv_p priv; 287 node_p node; 288 289 /* 290 * Do not create / attach an ether node to this ifnet if 291 * a netgraph node with the same name already exists. 292 * This should prevent ether nodes to become attached to 293 * eiface nodes, which may be problematic due to naming 294 * clashes. 295 */ 296 if ((node = ng_name2noderef(NULL, ifp->if_xname)) != NULL) { 297 NG_NODE_UNREF(node); 298 return; 299 } 300 301 /* Create node */ 302 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 303 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 304 log(LOG_ERR, "%s: can't %s for %s\n", 305 __func__, "create node", ifp->if_xname); 306 return; 307 } 308 309 /* Allocate private data */ 310 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 311 if (priv == NULL) { 312 log(LOG_ERR, "%s: can't %s for %s\n", 313 __func__, "allocate memory", ifp->if_xname); 314 NG_NODE_UNREF(node); 315 return; 316 } 317 NG_NODE_SET_PRIVATE(node, priv); 318 priv->ifp = ifp; 319 IFP2NG(ifp) = node; 320 priv->hwassist = ifp->if_hwassist; 321 322 /* Try to give the node the same name as the interface */ 323 if (ng_name_node(node, ifp->if_xname) != 0) { 324 log(LOG_WARNING, "%s: can't name node %s\n", 325 __func__, ifp->if_xname); 326 } 327} 328 329/* 330 * An Ethernet interface is being detached. 331 * REALLY Destroy its node. 332 */ 333static void 334ng_ether_detach(struct ifnet *ifp) 335{ 336 const node_p node = IFP2NG(ifp); 337 const priv_p priv = NG_NODE_PRIVATE(node); 338 339 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 340 /* 341 * We can't assume the ifnet is still around when we run shutdown 342 * So zap it now. XXX We HOPE that anything running at this time 343 * handles it (as it should in the non netgraph case). 344 */ 345 IFP2NG(ifp) = NULL; 346 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 347 ng_rmnode_self(node); /* remove all netgraph parts */ 348} 349 350/* 351 * Notify graph about link event. 352 * if_link_state_change() has already checked that the state has changed. 353 */ 354static void 355ng_ether_link_state(struct ifnet *ifp, int state) 356{ 357 const node_p node = IFP2NG(ifp); 358 const priv_p priv = NG_NODE_PRIVATE(node); 359 struct ng_mesg *msg; 360 int cmd, dummy_error = 0; 361 362 if (state == LINK_STATE_UP) 363 cmd = NGM_LINK_IS_UP; 364 else if (state == LINK_STATE_DOWN) 365 cmd = NGM_LINK_IS_DOWN; 366 else 367 return; 368 369 if (priv->lower != NULL) { 370 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 371 if (msg != NULL) 372 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 373 } 374 if (priv->orphan != NULL) { 375 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 376 if (msg != NULL) 377 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0); 378 } 379} 380 381/****************************************************************** 382 NETGRAPH NODE METHODS 383******************************************************************/ 384 385/* 386 * It is not possible or allowable to create a node of this type. 387 * Nodes get created when the interface is attached (or, when 388 * this node type's KLD is loaded). 389 */ 390static int 391ng_ether_constructor(node_p node) 392{ 393 return (EINVAL); 394} 395 396/* 397 * Check for attaching a new hook. 398 */ 399static int 400ng_ether_newhook(node_p node, hook_p hook, const char *name) 401{ 402 const priv_p priv = NG_NODE_PRIVATE(node); 403 hook_p *hookptr; 404 405 /* Divert hook is an alias for lower */ 406 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 407 name = NG_ETHER_HOOK_LOWER; 408 409 /* Which hook? */ 410 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) { 411 hookptr = &priv->upper; 412 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper); 413 NG_HOOK_SET_TO_INBOUND(hook); 414 } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 415 hookptr = &priv->lower; 416 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower); 417 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 418 hookptr = &priv->orphan; 419 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower); 420 } else 421 return (EINVAL); 422 423 /* Check if already connected (shouldn't be, but doesn't hurt) */ 424 if (*hookptr != NULL) 425 return (EISCONN); 426 427 /* Disable hardware checksums while 'upper' hook is connected */ 428 if (hookptr == &priv->upper) 429 priv->ifp->if_hwassist = 0; 430 NG_HOOK_HI_STACK(hook); 431 /* OK */ 432 *hookptr = hook; 433 return (0); 434} 435 436/* 437 * Receive an incoming control message. 438 */ 439static int 440ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 441{ 442 const priv_p priv = NG_NODE_PRIVATE(node); 443 struct ng_mesg *resp = NULL; 444 int error = 0; 445 struct ng_mesg *msg; 446 447 NGI_GET_MSG(item, msg); 448 switch (msg->header.typecookie) { 449 case NGM_ETHER_COOKIE: 450 switch (msg->header.cmd) { 451 case NGM_ETHER_GET_IFNAME: 452 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 453 if (resp == NULL) { 454 error = ENOMEM; 455 break; 456 } 457 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 458 break; 459 case NGM_ETHER_GET_IFINDEX: 460 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 461 if (resp == NULL) { 462 error = ENOMEM; 463 break; 464 } 465 *((u_int32_t *)resp->data) = priv->ifp->if_index; 466 break; 467 case NGM_ETHER_GET_ENADDR: 468 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 469 if (resp == NULL) { 470 error = ENOMEM; 471 break; 472 } 473 bcopy(IF_LLADDR(priv->ifp), 474 resp->data, ETHER_ADDR_LEN); 475 break; 476 case NGM_ETHER_SET_ENADDR: 477 { 478 if (msg->header.arglen != ETHER_ADDR_LEN) { 479 error = EINVAL; 480 break; 481 } 482 error = if_setlladdr(priv->ifp, 483 (u_char *)msg->data, ETHER_ADDR_LEN); 484 EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp); 485 break; 486 } 487 case NGM_ETHER_GET_PROMISC: 488 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 489 if (resp == NULL) { 490 error = ENOMEM; 491 break; 492 } 493 *((u_int32_t *)resp->data) = priv->promisc; 494 break; 495 case NGM_ETHER_SET_PROMISC: 496 { 497 u_char want; 498 499 if (msg->header.arglen != sizeof(u_int32_t)) { 500 error = EINVAL; 501 break; 502 } 503 want = !!*((u_int32_t *)msg->data); 504 if (want ^ priv->promisc) { 505 if ((error = ifpromisc(priv->ifp, want)) != 0) 506 break; 507 priv->promisc = want; 508 } 509 break; 510 } 511 case NGM_ETHER_GET_AUTOSRC: 512 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 513 if (resp == NULL) { 514 error = ENOMEM; 515 break; 516 } 517 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 518 break; 519 case NGM_ETHER_SET_AUTOSRC: 520 if (msg->header.arglen != sizeof(u_int32_t)) { 521 error = EINVAL; 522 break; 523 } 524 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 525 break; 526 case NGM_ETHER_ADD_MULTI: 527 { 528 struct sockaddr_dl sa_dl; 529 struct ifmultiaddr *ifma; 530 531 if (msg->header.arglen != ETHER_ADDR_LEN) { 532 error = EINVAL; 533 break; 534 } 535 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 536 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 537 sa_dl.sdl_family = AF_LINK; 538 sa_dl.sdl_alen = ETHER_ADDR_LEN; 539 bcopy((void *)msg->data, LLADDR(&sa_dl), 540 ETHER_ADDR_LEN); 541 /* 542 * Netgraph is only permitted to join groups once 543 * via the if_addmulti() KPI, because it cannot hold 544 * struct ifmultiaddr * between calls. It may also 545 * lose a race while we check if the membership 546 * already exists. 547 */ 548 if_maddr_rlock(priv->ifp); 549 ifma = if_findmulti(priv->ifp, 550 (struct sockaddr *)&sa_dl); 551 if_maddr_runlock(priv->ifp); 552 if (ifma != NULL) { 553 error = EADDRINUSE; 554 } else { 555 error = if_addmulti(priv->ifp, 556 (struct sockaddr *)&sa_dl, &ifma); 557 } 558 break; 559 } 560 case NGM_ETHER_DEL_MULTI: 561 { 562 struct sockaddr_dl sa_dl; 563 564 if (msg->header.arglen != ETHER_ADDR_LEN) { 565 error = EINVAL; 566 break; 567 } 568 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 569 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 570 sa_dl.sdl_family = AF_LINK; 571 sa_dl.sdl_alen = ETHER_ADDR_LEN; 572 bcopy((void *)msg->data, LLADDR(&sa_dl), 573 ETHER_ADDR_LEN); 574 error = if_delmulti(priv->ifp, 575 (struct sockaddr *)&sa_dl); 576 break; 577 } 578 case NGM_ETHER_DETACH: 579 ng_ether_detach(priv->ifp); 580 break; 581 default: 582 error = EINVAL; 583 break; 584 } 585 break; 586 default: 587 error = EINVAL; 588 break; 589 } 590 NG_RESPOND_MSG(error, node, item, resp); 591 NG_FREE_MSG(msg); 592 return (error); 593} 594 595/* 596 * Receive data on a hook. 597 * Since we use per-hook recveive methods this should never be called. 598 */ 599static int 600ng_ether_rcvdata(hook_p hook, item_p item) 601{ 602 NG_FREE_ITEM(item); 603 604 panic("%s: weird hook", __func__); 605#ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */ 606 return (0); 607#endif 608} 609 610/* 611 * Handle an mbuf received on the "lower" or "orphan" hook. 612 */ 613static int 614ng_ether_rcv_lower(hook_p hook, item_p item) 615{ 616 struct mbuf *m; 617 const node_p node = NG_HOOK_NODE(hook); 618 const priv_p priv = NG_NODE_PRIVATE(node); 619 struct ifnet *const ifp = priv->ifp; 620 621 NGI_GET_M(item, m); 622 NG_FREE_ITEM(item); 623 624 /* Check whether interface is ready for packets */ 625 626 if (!((ifp->if_flags & IFF_UP) && 627 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 628 NG_FREE_M(m); 629 return (ENETDOWN); 630 } 631 632 /* Make sure header is fully pulled up */ 633 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 634 NG_FREE_M(m); 635 return (EINVAL); 636 } 637 if (m->m_len < sizeof(struct ether_header) 638 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 639 return (ENOBUFS); 640 641 /* Drop in the MAC address if desired */ 642 if (priv->autoSrcAddr) { 643 644 /* Make the mbuf writable if it's not already */ 645 if (!M_WRITABLE(m) 646 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 647 return (ENOBUFS); 648 649 /* Overwrite source MAC address */ 650 bcopy(IF_LLADDR(ifp), 651 mtod(m, struct ether_header *)->ether_shost, 652 ETHER_ADDR_LEN); 653 } 654 655 /* Send it on its way */ 656 return ether_output_frame(ifp, m); 657} 658 659/* 660 * Handle an mbuf received on the "upper" hook. 661 */ 662static int 663ng_ether_rcv_upper(hook_p hook, item_p item) 664{ 665 struct mbuf *m; 666 const node_p node = NG_HOOK_NODE(hook); 667 const priv_p priv = NG_NODE_PRIVATE(node); 668 struct ifnet *ifp = priv->ifp; 669 670 NGI_GET_M(item, m); 671 NG_FREE_ITEM(item); 672 673 /* Check length and pull off header */ 674 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 675 NG_FREE_M(m); 676 return (EINVAL); 677 } 678 if (m->m_len < sizeof(struct ether_header) && 679 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 680 return (ENOBUFS); 681 682 m->m_pkthdr.rcvif = ifp; 683 684 /* Pass the packet to the bridge, it may come back to us */ 685 if (ifp->if_bridge) { 686 BRIDGE_INPUT(ifp, m); 687 if (m == NULL) 688 return (0); 689 } 690 691 /* Route packet back in */ 692 ether_demux(ifp, m); 693 return (0); 694} 695 696/* 697 * Shutdown node. This resets the node but does not remove it 698 * unless the REALLY_DIE flag is set. 699 */ 700static int 701ng_ether_shutdown(node_p node) 702{ 703 const priv_p priv = NG_NODE_PRIVATE(node); 704 705 if (node->nd_flags & NGF_REALLY_DIE) { 706 /* 707 * WE came here because the ethernet card is being unloaded, 708 * so stop being persistant. 709 * Actually undo all the things we did on creation. 710 * Assume the ifp has already been freed. 711 */ 712 NG_NODE_SET_PRIVATE(node, NULL); 713 free(priv, M_NETGRAPH); 714 NG_NODE_UNREF(node); /* free node itself */ 715 return (0); 716 } 717 if (priv->promisc) { /* disable promiscuous mode */ 718 (void)ifpromisc(priv->ifp, 0); 719 priv->promisc = 0; 720 } 721 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 722 723 return (0); 724} 725 726/* 727 * Hook disconnection. 728 */ 729static int 730ng_ether_disconnect(hook_p hook) 731{ 732 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 733 734 if (hook == priv->upper) { 735 priv->upper = NULL; 736 if (priv->ifp != NULL) /* restore h/w csum */ 737 priv->ifp->if_hwassist = priv->hwassist; 738 } else if (hook == priv->lower) 739 priv->lower = NULL; 740 else if (hook == priv->orphan) 741 priv->orphan = NULL; 742 else 743 panic("%s: weird hook", __func__); 744 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 745 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 746 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 747 return (0); 748} 749 750/****************************************************************** 751 INITIALIZATION 752******************************************************************/ 753 754/* 755 * Handle loading and unloading for this node type. 756 */ 757static int 758ng_ether_mod_event(module_t mod, int event, void *data) 759{ 760 int error = 0; 761 int s; 762 763 s = splnet(); 764 switch (event) { 765 case MOD_LOAD: 766 767 /* Register function hooks */ 768 if (ng_ether_attach_p != NULL) { 769 error = EEXIST; 770 break; 771 } 772 ng_ether_attach_p = ng_ether_attach; 773 ng_ether_detach_p = ng_ether_detach; 774 ng_ether_output_p = ng_ether_output; 775 ng_ether_input_p = ng_ether_input; 776 ng_ether_input_orphan_p = ng_ether_input_orphan; 777 ng_ether_link_state_p = ng_ether_link_state; 778 779 break; 780 781 case MOD_UNLOAD: 782 783 /* 784 * Note that the base code won't try to unload us until 785 * all nodes have been removed, and that can't happen 786 * until all Ethernet interfaces are removed. In any 787 * case, we know there are no nodes left if the action 788 * is MOD_UNLOAD, so there's no need to detach any nodes. 789 */ 790 791 /* Unregister function hooks */ 792 ng_ether_attach_p = NULL; 793 ng_ether_detach_p = NULL; 794 ng_ether_output_p = NULL; 795 ng_ether_input_p = NULL; 796 ng_ether_input_orphan_p = NULL; 797 ng_ether_link_state_p = NULL; 798 break; 799 800 default: 801 error = EOPNOTSUPP; 802 break; 803 } 804 splx(s); 805 return (error); 806} 807 808static void 809vnet_ng_ether_init(const void *unused) 810{ 811 struct ifnet *ifp; 812 813 /* If module load was rejected, don't attach to vnets. */ 814 if (ng_ether_attach_p != ng_ether_attach) 815 return; 816 817 /* Create nodes for any already-existing Ethernet interfaces. */ 818 IFNET_RLOCK(); 819 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 820 if (ifp->if_type == IFT_ETHER 821 || ifp->if_type == IFT_L2VLAN) 822 ng_ether_attach(ifp); 823 } 824 IFNET_RUNLOCK(); 825} 826VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 827 vnet_ng_ether_init, NULL); 828