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 * $FreeBSD$ 43 */ 44 45 /* 46 * ng_ether(4) netgraph node type 47 */ 48 49 #include "opt_route.h" 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/kernel.h> 54 #include <sys/malloc.h> 55 #include <sys/mbuf.h> 56 #include <sys/errno.h> 57 #include <sys/syslog.h> 58 #include <sys/socket.h> 59 #include <sys/vimage.h> 60 61 #include <net/if.h> 62 #include <net/if_dl.h> 63 #include <net/if_types.h> 64 #include <net/if_arp.h> 65 #include <net/if_var.h> 66 #include <net/ethernet.h> 67 #include <net/if_bridgevar.h> 68 #include <net/route.h> 69 #include <net/vnet.h> 70 71 #include <netgraph/ng_message.h> 72 #include <netgraph/netgraph.h> 73 #include <netgraph/ng_parse.h> 74 #include <netgraph/ng_ether.h> 75 76 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph) 77 78 static vnet_attach_fn ng_ether_iattach; 79 80 #ifndef VIMAGE_GLOBALS 81 static vnet_modinfo_t vnet_ng_ether_modinfo = { 82 .vmi_id = VNET_MOD_NG_ETHER, 83 .vmi_name = "ng_ether", 84 .vmi_dependson = VNET_MOD_NETGRAPH, 85 .vmi_iattach = ng_ether_iattach, 86 }; 87 #endif 88 89 /* Per-node private data */ 90 struct private { 91 struct ifnet *ifp; /* associated interface */ 92 hook_p upper; /* upper hook connection */ 93 hook_p lower; /* lower hook connection */ 94 hook_p orphan; /* orphan hook connection */ 95 u_char autoSrcAddr; /* always overwrite source address */ 96 u_char promisc; /* promiscuous mode enabled */ 97 u_long hwassist; /* hardware checksum capabilities */ 98 u_int flags; /* flags e.g. really die */ 99 }; 100 typedef struct private *priv_p; 101 102 /* Hook pointers used by if_ethersubr.c to callback to netgraph */ 103 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 104 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 105 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 106 extern void (*ng_ether_attach_p)(struct ifnet *ifp); 107 extern void (*ng_ether_detach_p)(struct ifnet *ifp); 108 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 109 110 /* Functional hooks called from if_ethersubr.c */ 111 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 112 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 113 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 114 static void ng_ether_attach(struct ifnet *ifp); 115 static void ng_ether_detach(struct ifnet *ifp); 116 static void ng_ether_link_state(struct ifnet *ifp, int state); 117 118 /* Other functions */ 119 static int ng_ether_rcv_lower(hook_p node, item_p item); 120 static int ng_ether_rcv_upper(hook_p node, item_p item); 121 122 /* Netgraph node methods */ 123 static ng_constructor_t ng_ether_constructor; 124 static ng_rcvmsg_t ng_ether_rcvmsg; 125 static ng_shutdown_t ng_ether_shutdown; 126 static ng_newhook_t ng_ether_newhook; 127 static ng_rcvdata_t ng_ether_rcvdata; 128 static ng_disconnect_t ng_ether_disconnect; 129 static int ng_ether_mod_event(module_t mod, int event, void *data); 130 131 /* List of commands and how to convert arguments to/from ASCII */ 132 static const struct ng_cmdlist ng_ether_cmdlist[] = { 133 { 134 NGM_ETHER_COOKIE, 135 NGM_ETHER_GET_IFNAME, 136 "getifname", 137 NULL, 138 &ng_parse_string_type 139 }, 140 { 141 NGM_ETHER_COOKIE, 142 NGM_ETHER_GET_IFINDEX, 143 "getifindex", 144 NULL, 145 &ng_parse_int32_type 146 }, 147 { 148 NGM_ETHER_COOKIE, 149 NGM_ETHER_GET_ENADDR, 150 "getenaddr", 151 NULL, 152 &ng_parse_enaddr_type 153 }, 154 { 155 NGM_ETHER_COOKIE, 156 NGM_ETHER_SET_ENADDR, 157 "setenaddr", 158 &ng_parse_enaddr_type, 159 NULL 160 }, 161 { 162 NGM_ETHER_COOKIE, 163 NGM_ETHER_GET_PROMISC, 164 "getpromisc", 165 NULL, 166 &ng_parse_int32_type 167 }, 168 { 169 NGM_ETHER_COOKIE, 170 NGM_ETHER_SET_PROMISC, 171 "setpromisc", 172 &ng_parse_int32_type, 173 NULL 174 }, 175 { 176 NGM_ETHER_COOKIE, 177 NGM_ETHER_GET_AUTOSRC, 178 "getautosrc", 179 NULL, 180 &ng_parse_int32_type 181 }, 182 { 183 NGM_ETHER_COOKIE, 184 NGM_ETHER_SET_AUTOSRC, 185 "setautosrc", 186 &ng_parse_int32_type, 187 NULL 188 }, 189 { 190 NGM_ETHER_COOKIE, 191 NGM_ETHER_ADD_MULTI, 192 "addmulti", 193 &ng_parse_enaddr_type, 194 NULL 195 }, 196 { 197 NGM_ETHER_COOKIE, 198 NGM_ETHER_DEL_MULTI, 199 "delmulti", 200 &ng_parse_enaddr_type, 201 NULL 202 }, 203 { 204 NGM_ETHER_COOKIE, 205 NGM_ETHER_DETACH, 206 "detach", 207 NULL, 208 NULL 209 }, 210 { 0 } 211 }; 212 213 static struct ng_type ng_ether_typestruct = { 214 .version = NG_ABI_VERSION, 215 .name = NG_ETHER_NODE_TYPE, 216 .mod_event = ng_ether_mod_event, 217 .constructor = ng_ether_constructor, 218 .rcvmsg = ng_ether_rcvmsg, 219 .shutdown = ng_ether_shutdown, 220 .newhook = ng_ether_newhook, 221 .rcvdata = ng_ether_rcvdata, 222 .disconnect = ng_ether_disconnect, 223 .cmdlist = ng_ether_cmdlist, 224 }; 225 NETGRAPH_INIT(ether, &ng_ether_typestruct); 226 227 /****************************************************************** 228 ETHERNET FUNCTION HOOKS 229 ******************************************************************/ 230 231 /* 232 * Handle a packet that has come in on an interface. We get to 233 * look at it here before any upper layer protocols do. 234 * 235 * NOTE: this function will get called at splimp() 236 */ 237 static void 238 ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 239 { 240 const node_p node = IFP2NG(ifp); 241 const priv_p priv = NG_NODE_PRIVATE(node); 242 int error; 243 244 /* If "lower" hook not connected, let packet continue */ 245 if (priv->lower == NULL) 246 return; 247 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 248 } 249 250 /* 251 * Handle a packet that has come in on an interface, and which 252 * does not match any of our known protocols (an ``orphan''). 253 * 254 * NOTE: this function will get called at splimp() 255 */ 256 static void 257 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 258 { 259 const node_p node = IFP2NG(ifp); 260 const priv_p priv = NG_NODE_PRIVATE(node); 261 int error; 262 263 /* If "orphan" hook not connected, discard packet */ 264 if (priv->orphan == NULL) { 265 m_freem(m); 266 return; 267 } 268 NG_SEND_DATA_ONLY(error, priv->orphan, m); 269 } 270 271 /* 272 * Handle a packet that is going out on an interface. 273 * The Ethernet header is already attached to the mbuf. 274 */ 275 static int 276 ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 277 { 278 const node_p node = IFP2NG(ifp); 279 const priv_p priv = NG_NODE_PRIVATE(node); 280 int error = 0; 281 282 /* If "upper" hook not connected, let packet continue */ 283 if (priv->upper == NULL) 284 return (0); 285 286 /* Send it out "upper" hook */ 287 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 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 priv_p priv; 299 node_p node; 300 301 /* 302 * Do not create / attach an ether node to this ifnet if 303 * a netgraph node with the same name already exists. 304 * This should prevent ether nodes to become attached to 305 * eiface nodes, which may be problematic due to naming 306 * clashes. 307 */ 308 if ((node = ng_name2noderef(NULL, ifp->if_xname)) != NULL) { 309 NG_NODE_UNREF(node); 310 return; 311 } 312 313 /* Create node */ 314 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 315 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 316 log(LOG_ERR, "%s: can't %s for %s\n", 317 __func__, "create node", ifp->if_xname); 318 return; 319 } 320 321 /* Allocate private data */ 322 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 323 if (priv == NULL) { 324 log(LOG_ERR, "%s: can't %s for %s\n", 325 __func__, "allocate memory", ifp->if_xname); 326 NG_NODE_UNREF(node); 327 return; 328 } 329 NG_NODE_SET_PRIVATE(node, priv); 330 priv->ifp = ifp; 331 IFP2NG(ifp) = node; 332 priv->hwassist = ifp->if_hwassist; 333 334 /* Try to give the node the same name as the interface */ 335 if (ng_name_node(node, ifp->if_xname) != 0) { 336 log(LOG_WARNING, "%s: can't name node %s\n", 337 __func__, ifp->if_xname); 338 } 339 } 340 341 /* 342 * An Ethernet interface is being detached. 343 * REALLY Destroy its node. 344 */ 345 static void 346 ng_ether_detach(struct ifnet *ifp) 347 { 348 const node_p node = IFP2NG(ifp); 349 const priv_p priv = NG_NODE_PRIVATE(node); 350 351 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 352 /* 353 * We can't assume the ifnet is still around when we run shutdown 354 * So zap it now. XXX We HOPE that anything running at this time 355 * handles it (as it should in the non netgraph case). 356 */ 357 IFP2NG(ifp) = NULL; 358 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 359 ng_rmnode_self(node); /* remove all netgraph parts */ 360 } 361 362 /* 363 * Notify graph about link event. 364 * if_link_state_change() has already checked that the state has changed. 365 */ 366 static void 367 ng_ether_link_state(struct ifnet *ifp, int state) 368 { 369 const node_p node = IFP2NG(ifp); 370 const priv_p priv = NG_NODE_PRIVATE(node); 371 struct ng_mesg *msg; 372 int cmd, dummy_error = 0; 373 374 if (priv->lower == NULL) 375 return; 376 377 if (state == LINK_STATE_UP) 378 cmd = NGM_LINK_IS_UP; 379 else if (state == LINK_STATE_DOWN) 380 cmd = NGM_LINK_IS_DOWN; 381 else 382 return; 383 384 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 385 if (msg != NULL) 386 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 387 } 388 389 /****************************************************************** 390 NETGRAPH NODE METHODS 391 ******************************************************************/ 392 393 /* 394 * It is not possible or allowable to create a node of this type. 395 * Nodes get created when the interface is attached (or, when 396 * this node type's KLD is loaded). 397 */ 398 static int 399 ng_ether_constructor(node_p node) 400 { 401 return (EINVAL); 402 } 403 404 /* 405 * Check for attaching a new hook. 406 */ 407 static int 408 ng_ether_newhook(node_p node, hook_p hook, const char *name) 409 { 410 const priv_p priv = NG_NODE_PRIVATE(node); 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 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper); 421 } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 422 hookptr = &priv->lower; 423 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower); 424 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 425 hookptr = &priv->orphan; 426 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower); 427 } else 428 return (EINVAL); 429 430 /* Check if already connected (shouldn't be, but doesn't hurt) */ 431 if (*hookptr != NULL) 432 return (EISCONN); 433 434 /* Disable hardware checksums while 'upper' hook is connected */ 435 if (hookptr == &priv->upper) 436 priv->ifp->if_hwassist = 0; 437 438 /* OK */ 439 *hookptr = hook; 440 return (0); 441 } 442 443 /* 444 * Receive an incoming control message. 445 */ 446 static int 447 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 448 { 449 const priv_p priv = NG_NODE_PRIVATE(node); 450 struct ng_mesg *resp = NULL; 451 int error = 0; 452 struct ng_mesg *msg; 453 454 NGI_GET_MSG(item, msg); 455 switch (msg->header.typecookie) { 456 case NGM_ETHER_COOKIE: 457 switch (msg->header.cmd) { 458 case NGM_ETHER_GET_IFNAME: 459 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 460 if (resp == NULL) { 461 error = ENOMEM; 462 break; 463 } 464 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 465 break; 466 case NGM_ETHER_GET_IFINDEX: 467 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 468 if (resp == NULL) { 469 error = ENOMEM; 470 break; 471 } 472 *((u_int32_t *)resp->data) = priv->ifp->if_index; 473 break; 474 case NGM_ETHER_GET_ENADDR: 475 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 476 if (resp == NULL) { 477 error = ENOMEM; 478 break; 479 } 480 bcopy(IF_LLADDR(priv->ifp), 481 resp->data, ETHER_ADDR_LEN); 482 break; 483 case NGM_ETHER_SET_ENADDR: 484 { 485 if (msg->header.arglen != ETHER_ADDR_LEN) { 486 error = EINVAL; 487 break; 488 } 489 error = if_setlladdr(priv->ifp, 490 (u_char *)msg->data, ETHER_ADDR_LEN); 491 break; 492 } 493 case NGM_ETHER_GET_PROMISC: 494 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 495 if (resp == NULL) { 496 error = ENOMEM; 497 break; 498 } 499 *((u_int32_t *)resp->data) = priv->promisc; 500 break; 501 case NGM_ETHER_SET_PROMISC: 502 { 503 u_char want; 504 505 if (msg->header.arglen != sizeof(u_int32_t)) { 506 error = EINVAL; 507 break; 508 } 509 want = !!*((u_int32_t *)msg->data); 510 if (want ^ priv->promisc) { 511 if ((error = ifpromisc(priv->ifp, want)) != 0) 512 break; 513 priv->promisc = want; 514 } 515 break; 516 } 517 case NGM_ETHER_GET_AUTOSRC: 518 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 519 if (resp == NULL) { 520 error = ENOMEM; 521 break; 522 } 523 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 524 break; 525 case NGM_ETHER_SET_AUTOSRC: 526 if (msg->header.arglen != sizeof(u_int32_t)) { 527 error = EINVAL; 528 break; 529 } 530 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 531 break; 532 case NGM_ETHER_ADD_MULTI: 533 { 534 struct sockaddr_dl sa_dl; 535 struct ifmultiaddr *ifma; 536 537 if (msg->header.arglen != ETHER_ADDR_LEN) { 538 error = EINVAL; 539 break; 540 } 541 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 542 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 543 sa_dl.sdl_family = AF_LINK; 544 sa_dl.sdl_alen = ETHER_ADDR_LEN; 545 bcopy((void *)msg->data, LLADDR(&sa_dl), 546 ETHER_ADDR_LEN); 547 /* 548 * Netgraph is only permitted to join groups once 549 * via the if_addmulti() KPI, because it cannot hold 550 * struct ifmultiaddr * between calls. It may also 551 * lose a race while we check if the membership 552 * already exists. 553 */ 554 IF_ADDR_LOCK(priv->ifp); 555 ifma = if_findmulti(priv->ifp, 556 (struct sockaddr *)&sa_dl); 557 IF_ADDR_UNLOCK(priv->ifp); 558 if (ifma != NULL) { 559 error = EADDRINUSE; 560 } else { 561 error = if_addmulti(priv->ifp, 562 (struct sockaddr *)&sa_dl, &ifma); 563 } 564 break; 565 } 566 case NGM_ETHER_DEL_MULTI: 567 { 568 struct sockaddr_dl sa_dl; 569 570 if (msg->header.arglen != ETHER_ADDR_LEN) { 571 error = EINVAL; 572 break; 573 } 574 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 575 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 576 sa_dl.sdl_family = AF_LINK; 577 sa_dl.sdl_alen = ETHER_ADDR_LEN; 578 bcopy((void *)msg->data, LLADDR(&sa_dl), 579 ETHER_ADDR_LEN); 580 error = if_delmulti(priv->ifp, 581 (struct sockaddr *)&sa_dl); 582 break; 583 } 584 case NGM_ETHER_DETACH: 585 ng_ether_detach(priv->ifp); 586 break; 587 default: 588 error = EINVAL; 589 break; 590 } 591 break; 592 default: 593 error = EINVAL; 594 break; 595 } 596 NG_RESPOND_MSG(error, node, item, resp); 597 NG_FREE_MSG(msg); 598 return (error); 599 } 600 601 /* 602 * Receive data on a hook. 603 * Since we use per-hook recveive methods this should never be called. 604 */ 605 static int 606 ng_ether_rcvdata(hook_p hook, item_p item) 607 { 608 NG_FREE_ITEM(item); 609 610 panic("%s: weird hook", __func__); 611 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */ 612 return (0); 613 #endif 614 } 615 616 /* 617 * Handle an mbuf received on the "lower" or "orphan" hook. 618 */ 619 static int 620 ng_ether_rcv_lower(hook_p hook, item_p item) 621 { 622 struct mbuf *m; 623 const node_p node = NG_HOOK_NODE(hook); 624 const priv_p priv = NG_NODE_PRIVATE(node); 625 struct ifnet *const ifp = priv->ifp; 626 627 NGI_GET_M(item, m); 628 NG_FREE_ITEM(item); 629 630 /* Check whether interface is ready for packets */ 631 632 if (!((ifp->if_flags & IFF_UP) && 633 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 634 NG_FREE_M(m); 635 return (ENETDOWN); 636 } 637 638 /* Make sure header is fully pulled up */ 639 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 640 NG_FREE_M(m); 641 return (EINVAL); 642 } 643 if (m->m_len < sizeof(struct ether_header) 644 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 645 return (ENOBUFS); 646 647 /* Drop in the MAC address if desired */ 648 if (priv->autoSrcAddr) { 649 650 /* Make the mbuf writable if it's not already */ 651 if (!M_WRITABLE(m) 652 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 653 return (ENOBUFS); 654 655 /* Overwrite source MAC address */ 656 bcopy(IF_LLADDR(ifp), 657 mtod(m, struct ether_header *)->ether_shost, 658 ETHER_ADDR_LEN); 659 } 660 661 /* Send it on its way */ 662 return ether_output_frame(ifp, m); 663 } 664 665 /* 666 * Handle an mbuf received on the "upper" hook. 667 */ 668 static int 669 ng_ether_rcv_upper(hook_p hook, item_p item) 670 { 671 struct mbuf *m; 672 const node_p node = NG_HOOK_NODE(hook); 673 const priv_p priv = NG_NODE_PRIVATE(node); 674 struct ifnet *ifp = priv->ifp; 675 676 NGI_GET_M(item, m); 677 NG_FREE_ITEM(item); 678 679 /* Check length and pull off header */ 680 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 681 NG_FREE_M(m); 682 return (EINVAL); 683 } 684 if (m->m_len < sizeof(struct ether_header) && 685 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 686 return (ENOBUFS); 687 688 m->m_pkthdr.rcvif = ifp; 689 690 /* Pass the packet to the bridge, it may come back to us */ 691 if (ifp->if_bridge) { 692 BRIDGE_INPUT(ifp, m); 693 if (m == NULL) 694 return (0); 695 } 696 697 /* Route packet back in */ 698 ether_demux(ifp, m); 699 return (0); 700 } 701 702 /* 703 * Shutdown node. This resets the node but does not remove it 704 * unless the REALLY_DIE flag is set. 705 */ 706 static int 707 ng_ether_shutdown(node_p node) 708 { 709 const priv_p priv = NG_NODE_PRIVATE(node); 710 711 if (node->nd_flags & NGF_REALLY_DIE) { 712 /* 713 * WE came here because the ethernet card is being unloaded, 714 * so stop being persistant. 715 * Actually undo all the things we did on creation. 716 * Assume the ifp has already been freed. 717 */ 718 NG_NODE_SET_PRIVATE(node, NULL); 719 free(priv, M_NETGRAPH); 720 NG_NODE_UNREF(node); /* free node itself */ 721 return (0); 722 } 723 if (priv->promisc) { /* disable promiscuous mode */ 724 (void)ifpromisc(priv->ifp, 0); 725 priv->promisc = 0; 726 } 727 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 728 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 729 730 return (0); 731 } 732 733 /* 734 * Hook disconnection. 735 */ 736 static int 737 ng_ether_disconnect(hook_p hook) 738 { 739 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 740 741 if (hook == priv->upper) { 742 priv->upper = NULL; 743 if (priv->ifp != NULL) /* restore h/w csum */ 744 priv->ifp->if_hwassist = priv->hwassist; 745 } else if (hook == priv->lower) 746 priv->lower = NULL; 747 else if (hook == priv->orphan) 748 priv->orphan = NULL; 749 else 750 panic("%s: weird hook", __func__); 751 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 752 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 753 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 754 return (0); 755 } 756 757 /****************************************************************** 758 INITIALIZATION 759 ******************************************************************/ 760 761 /* 762 * Handle loading and unloading for this node type. 763 */ 764 static int 765 ng_ether_mod_event(module_t mod, int event, void *data) 766 { 767 int error = 0; 768 int s; 769 770 s = splnet(); 771 switch (event) { 772 case MOD_LOAD: 773 774 /* Register function hooks */ 775 if (ng_ether_attach_p != NULL) { 776 error = EEXIST; 777 break; 778 } 779 ng_ether_attach_p = ng_ether_attach; 780 ng_ether_detach_p = ng_ether_detach; 781 ng_ether_output_p = ng_ether_output; 782 ng_ether_input_p = ng_ether_input; 783 ng_ether_input_orphan_p = ng_ether_input_orphan; 784 ng_ether_link_state_p = ng_ether_link_state; 785 786 #ifndef VIMAGE_GLOBALS 787 vnet_mod_register(&vnet_ng_ether_modinfo); 788 #else 789 error = ng_ether_iattach(NULL); 790 #endif 791 break; 792 793 case MOD_UNLOAD: 794 795 /* 796 * Note that the base code won't try to unload us until 797 * all nodes have been removed, and that can't happen 798 * until all Ethernet interfaces are removed. In any 799 * case, we know there are no nodes left if the action 800 * is MOD_UNLOAD, so there's no need to detach any nodes. 801 */ 802 803 #ifndef VIMAGE_GLOBALS 804 vnet_mod_deregister(&vnet_ng_ether_modinfo); 805 #endif 806 807 /* Unregister function hooks */ 808 ng_ether_attach_p = NULL; 809 ng_ether_detach_p = NULL; 810 ng_ether_output_p = NULL; 811 ng_ether_input_p = NULL; 812 ng_ether_input_orphan_p = NULL; 813 ng_ether_link_state_p = NULL; 814 break; 815 816 default: 817 error = EOPNOTSUPP; 818 break; 819 } 820 splx(s); 821 return (error); 822 } 823 824 static int ng_ether_iattach(const void *unused) 825 { 826 INIT_VNET_NET(curvnet); 827 struct ifnet *ifp; 828 829 /* Create nodes for any already-existing Ethernet interfaces. */ 830 IFNET_RLOCK(); 831 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 832 if (ifp->if_type == IFT_ETHER 833 || ifp->if_type == IFT_L2VLAN) 834 ng_ether_attach(ifp); 835 } 836 IFNET_RUNLOCK(); 837 838 return (0); 839 } 840