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sys/netgraph/ng_ether.c
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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: releng/8.4/sys/netgraph/ng_ether.c 247885 2013-03-06 11:00:47Z avg $ 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 #include <sys/taskqueue.h> 59 60 #include <net/if.h> 61 #include <net/if_dl.h> 62 #include <net/if_types.h> 63 #include <net/if_arp.h> 64 #include <net/if_var.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 74 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph) 75 76 /* Per-node private data */ 77 struct private { 78 struct ifnet *ifp; /* associated interface */ 79 hook_p upper; /* upper hook connection */ 80 hook_p lower; /* lower hook connection */ 81 hook_p orphan; /* orphan hook connection */ 82 u_char autoSrcAddr; /* always overwrite source address */ 83 u_char promisc; /* promiscuous mode enabled */ 84 u_long hwassist; /* hardware checksum capabilities */ 85 u_int flags; /* flags e.g. really die */ 86 }; 87 typedef struct private *priv_p; 88 89 /* Hook pointers used by if_ethersubr.c to callback to netgraph */ 90 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 91 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 92 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 93 extern void (*ng_ether_attach_p)(struct ifnet *ifp); 94 extern void (*ng_ether_detach_p)(struct ifnet *ifp); 95 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 96 97 /* Functional hooks called from if_ethersubr.c */ 98 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 99 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 100 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 101 static void ng_ether_attach(struct ifnet *ifp); 102 static void ng_ether_detach(struct ifnet *ifp); 103 static void ng_ether_link_state(struct ifnet *ifp, int state); 104 105 /* Other functions */ 106 static int ng_ether_rcv_lower(hook_p node, item_p item); 107 static int ng_ether_rcv_upper(hook_p node, item_p item); 108 109 /* Netgraph node methods */ 110 static ng_constructor_t ng_ether_constructor; 111 static ng_rcvmsg_t ng_ether_rcvmsg; 112 static ng_shutdown_t ng_ether_shutdown; 113 static ng_newhook_t ng_ether_newhook; 114 static ng_rcvdata_t ng_ether_rcvdata; 115 static ng_disconnect_t ng_ether_disconnect; 116 static int ng_ether_mod_event(module_t mod, int event, void *data); 117 118 static eventhandler_tag ng_ether_ifnet_arrival_cookie; 119 120 /* List of commands and how to convert arguments to/from ASCII */ 121 static const struct ng_cmdlist ng_ether_cmdlist[] = { 122 { 123 NGM_ETHER_COOKIE, 124 NGM_ETHER_GET_IFNAME, 125 "getifname", 126 NULL, 127 &ng_parse_string_type 128 }, 129 { 130 NGM_ETHER_COOKIE, 131 NGM_ETHER_GET_IFINDEX, 132 "getifindex", 133 NULL, 134 &ng_parse_int32_type 135 }, 136 { 137 NGM_ETHER_COOKIE, 138 NGM_ETHER_GET_ENADDR, 139 "getenaddr", 140 NULL, 141 &ng_parse_enaddr_type 142 }, 143 { 144 NGM_ETHER_COOKIE, 145 NGM_ETHER_SET_ENADDR, 146 "setenaddr", 147 &ng_parse_enaddr_type, 148 NULL 149 }, 150 { 151 NGM_ETHER_COOKIE, 152 NGM_ETHER_GET_PROMISC, 153 "getpromisc", 154 NULL, 155 &ng_parse_int32_type 156 }, 157 { 158 NGM_ETHER_COOKIE, 159 NGM_ETHER_SET_PROMISC, 160 "setpromisc", 161 &ng_parse_int32_type, 162 NULL 163 }, 164 { 165 NGM_ETHER_COOKIE, 166 NGM_ETHER_GET_AUTOSRC, 167 "getautosrc", 168 NULL, 169 &ng_parse_int32_type 170 }, 171 { 172 NGM_ETHER_COOKIE, 173 NGM_ETHER_SET_AUTOSRC, 174 "setautosrc", 175 &ng_parse_int32_type, 176 NULL 177 }, 178 { 179 NGM_ETHER_COOKIE, 180 NGM_ETHER_ADD_MULTI, 181 "addmulti", 182 &ng_parse_enaddr_type, 183 NULL 184 }, 185 { 186 NGM_ETHER_COOKIE, 187 NGM_ETHER_DEL_MULTI, 188 "delmulti", 189 &ng_parse_enaddr_type, 190 NULL 191 }, 192 { 193 NGM_ETHER_COOKIE, 194 NGM_ETHER_DETACH, 195 "detach", 196 NULL, 197 NULL 198 }, 199 { 0 } 200 }; 201 202 static struct ng_type ng_ether_typestruct = { 203 .version = NG_ABI_VERSION, 204 .name = NG_ETHER_NODE_TYPE, 205 .mod_event = ng_ether_mod_event, 206 .constructor = ng_ether_constructor, 207 .rcvmsg = ng_ether_rcvmsg, 208 .shutdown = ng_ether_shutdown, 209 .newhook = ng_ether_newhook, 210 .rcvdata = ng_ether_rcvdata, 211 .disconnect = ng_ether_disconnect, 212 .cmdlist = ng_ether_cmdlist, 213 }; 214 NETGRAPH_INIT(ether, &ng_ether_typestruct); 215 216 /****************************************************************** 217 UTILITY FUNCTIONS 218 ******************************************************************/ 219 static void 220 ng_ether_sanitize_ifname(const char *ifname, char *name) 221 { 222 int i; 223 224 for (i = 0; i < IFNAMSIZ; i++) { 225 if (ifname[i] == '.' || ifname[i] == ':') 226 name[i] = '_'; 227 else 228 name[i] = ifname[i]; 229 if (name[i] == '\0') 230 break; 231 } 232 } 233 234 /****************************************************************** 235 ETHERNET FUNCTION HOOKS 236 ******************************************************************/ 237 238 /* 239 * Handle a packet that has come in on an interface. We get to 240 * look at it here before any upper layer protocols do. 241 * 242 * NOTE: this function will get called at splimp() 243 */ 244 static void 245 ng_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 * 261 * NOTE: this function will get called at splimp() 262 */ 263 static void 264 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 265 { 266 const node_p node = IFP2NG(ifp); 267 const priv_p priv = NG_NODE_PRIVATE(node); 268 int error; 269 270 /* If "orphan" hook not connected, discard packet */ 271 if (priv->orphan == NULL) { 272 m_freem(m); 273 return; 274 } 275 NG_SEND_DATA_ONLY(error, priv->orphan, m); 276 } 277 278 /* 279 * Handle a packet that is going out on an interface. 280 * The Ethernet header is already attached to the mbuf. 281 */ 282 static int 283 ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 284 { 285 const node_p node = IFP2NG(ifp); 286 const priv_p priv = NG_NODE_PRIVATE(node); 287 int error = 0; 288 289 /* If "upper" hook not connected, let packet continue */ 290 if (priv->upper == NULL) 291 return (0); 292 293 /* Send it out "upper" hook */ 294 NG_OUTBOUND_THREAD_REF(); 295 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 296 NG_OUTBOUND_THREAD_UNREF(); 297 return (error); 298 } 299 300 /* 301 * A new Ethernet interface has been attached. 302 * Create a new node for it, etc. 303 */ 304 static void 305 ng_ether_attach(struct ifnet *ifp) 306 { 307 char name[IFNAMSIZ]; 308 priv_p priv; 309 node_p node; 310 311 /* 312 * Do not create / attach an ether node to this ifnet if 313 * a netgraph node with the same name already exists. 314 * This should prevent ether nodes to become attached to 315 * eiface nodes, which may be problematic due to naming 316 * clashes. 317 */ 318 if ((node = ng_name2noderef(NULL, ifp->if_xname)) != NULL) { 319 NG_NODE_UNREF(node); 320 return; 321 } 322 323 /* Create node */ 324 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 325 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) { 326 log(LOG_ERR, "%s: can't %s for %s\n", 327 __func__, "create node", ifp->if_xname); 328 return; 329 } 330 331 /* Allocate private data */ 332 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 333 if (priv == NULL) { 334 log(LOG_ERR, "%s: can't %s for %s\n", 335 __func__, "allocate memory", ifp->if_xname); 336 NG_NODE_UNREF(node); 337 return; 338 } 339 NG_NODE_SET_PRIVATE(node, priv); 340 priv->ifp = ifp; 341 IFP2NG(ifp) = node; 342 priv->hwassist = ifp->if_hwassist; 343 344 /* Try to give the node the same name as the interface */ 345 ng_ether_sanitize_ifname(ifp->if_xname, name); 346 if (ng_name_node(node, name) != 0) 347 log(LOG_WARNING, "%s: can't name node %s\n", __func__, name); 348 } 349 350 /* 351 * An Ethernet interface is being detached. 352 * REALLY Destroy its node. 353 */ 354 static void 355 ng_ether_detach(struct ifnet *ifp) 356 { 357 const node_p node = IFP2NG(ifp); 358 const priv_p priv = NG_NODE_PRIVATE(node); 359 360 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 361 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 362 /* 363 * We can't assume the ifnet is still around when we run shutdown 364 * So zap it now. XXX We HOPE that anything running at this time 365 * handles it (as it should in the non netgraph case). 366 */ 367 IFP2NG(ifp) = NULL; 368 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 369 ng_rmnode_self(node); /* remove all netgraph parts */ 370 } 371 372 /* 373 * Notify graph about link event. 374 * if_link_state_change() has already checked that the state has changed. 375 */ 376 static void 377 ng_ether_link_state(struct ifnet *ifp, int state) 378 { 379 const node_p node = IFP2NG(ifp); 380 const priv_p priv = NG_NODE_PRIVATE(node); 381 struct ng_mesg *msg; 382 int cmd, dummy_error = 0; 383 384 if (state == LINK_STATE_UP) 385 cmd = NGM_LINK_IS_UP; 386 else if (state == LINK_STATE_DOWN) 387 cmd = NGM_LINK_IS_DOWN; 388 else 389 return; 390 391 if (priv->lower != NULL) { 392 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 393 if (msg != NULL) 394 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 395 } 396 if (priv->orphan != NULL) { 397 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 398 if (msg != NULL) 399 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0); 400 } 401 } 402 403 /* 404 * Interface arrival notification handler. 405 * The notification is produced in two cases: 406 * o a new interface arrives 407 * o an existing interface got renamed 408 * Currently the first case is handled by ng_ether_attach via special 409 * hook ng_ether_attach_p. 410 */ 411 static void 412 ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp) 413 { 414 char name[IFNAMSIZ]; 415 node_p node; 416 417 /* Only ethernet interfaces are of interest. */ 418 if (ifp->if_type != IFT_ETHER 419 && ifp->if_type != IFT_L2VLAN) 420 return; 421 422 /* 423 * Just return if it's a new interface without an ng_ether companion. 424 */ 425 node = IFP2NG(ifp); 426 if (node == NULL) 427 return; 428 429 /* Try to give the node the same name as the new interface name */ 430 ng_ether_sanitize_ifname(ifp->if_xname, name); 431 if (ng_name_node(node, name) != 0) 432 log(LOG_WARNING, "%s: can't re-name node %s\n", __func__, name); 433 } 434 435 /****************************************************************** 436 NETGRAPH NODE METHODS 437 ******************************************************************/ 438 439 /* 440 * It is not possible or allowable to create a node of this type. 441 * Nodes get created when the interface is attached (or, when 442 * this node type's KLD is loaded). 443 */ 444 static int 445 ng_ether_constructor(node_p node) 446 { 447 return (EINVAL); 448 } 449 450 /* 451 * Check for attaching a new hook. 452 */ 453 static int 454 ng_ether_newhook(node_p node, hook_p hook, const char *name) 455 { 456 const priv_p priv = NG_NODE_PRIVATE(node); 457 hook_p *hookptr; 458 459 /* Divert hook is an alias for lower */ 460 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0) 461 name = NG_ETHER_HOOK_LOWER; 462 463 /* Which hook? */ 464 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) { 465 hookptr = &priv->upper; 466 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper); 467 NG_HOOK_SET_TO_INBOUND(hook); 468 } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) { 469 hookptr = &priv->lower; 470 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower); 471 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) { 472 hookptr = &priv->orphan; 473 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower); 474 } else 475 return (EINVAL); 476 477 /* Check if already connected (shouldn't be, but doesn't hurt) */ 478 if (*hookptr != NULL) 479 return (EISCONN); 480 481 /* Disable hardware checksums while 'upper' hook is connected */ 482 if (hookptr == &priv->upper) 483 priv->ifp->if_hwassist = 0; 484 NG_HOOK_HI_STACK(hook); 485 /* OK */ 486 *hookptr = hook; 487 return (0); 488 } 489 490 /* 491 * Receive an incoming control message. 492 */ 493 static int 494 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook) 495 { 496 const priv_p priv = NG_NODE_PRIVATE(node); 497 struct ng_mesg *resp = NULL; 498 int error = 0; 499 struct ng_mesg *msg; 500 501 NGI_GET_MSG(item, msg); 502 switch (msg->header.typecookie) { 503 case NGM_ETHER_COOKIE: 504 switch (msg->header.cmd) { 505 case NGM_ETHER_GET_IFNAME: 506 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 507 if (resp == NULL) { 508 error = ENOMEM; 509 break; 510 } 511 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 512 break; 513 case NGM_ETHER_GET_IFINDEX: 514 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 515 if (resp == NULL) { 516 error = ENOMEM; 517 break; 518 } 519 *((u_int32_t *)resp->data) = priv->ifp->if_index; 520 break; 521 case NGM_ETHER_GET_ENADDR: 522 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT); 523 if (resp == NULL) { 524 error = ENOMEM; 525 break; 526 } 527 bcopy(IF_LLADDR(priv->ifp), 528 resp->data, ETHER_ADDR_LEN); 529 break; 530 case NGM_ETHER_SET_ENADDR: 531 { 532 if (msg->header.arglen != ETHER_ADDR_LEN) { 533 error = EINVAL; 534 break; 535 } 536 error = if_setlladdr(priv->ifp, 537 (u_char *)msg->data, ETHER_ADDR_LEN); 538 EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp); 539 break; 540 } 541 case NGM_ETHER_GET_PROMISC: 542 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 543 if (resp == NULL) { 544 error = ENOMEM; 545 break; 546 } 547 *((u_int32_t *)resp->data) = priv->promisc; 548 break; 549 case NGM_ETHER_SET_PROMISC: 550 { 551 u_char want; 552 553 if (msg->header.arglen != sizeof(u_int32_t)) { 554 error = EINVAL; 555 break; 556 } 557 want = !!*((u_int32_t *)msg->data); 558 if (want ^ priv->promisc) { 559 if ((error = ifpromisc(priv->ifp, want)) != 0) 560 break; 561 priv->promisc = want; 562 } 563 break; 564 } 565 case NGM_ETHER_GET_AUTOSRC: 566 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 567 if (resp == NULL) { 568 error = ENOMEM; 569 break; 570 } 571 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 572 break; 573 case NGM_ETHER_SET_AUTOSRC: 574 if (msg->header.arglen != sizeof(u_int32_t)) { 575 error = EINVAL; 576 break; 577 } 578 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 579 break; 580 case NGM_ETHER_ADD_MULTI: 581 { 582 struct sockaddr_dl sa_dl; 583 struct ifmultiaddr *ifma; 584 585 if (msg->header.arglen != ETHER_ADDR_LEN) { 586 error = EINVAL; 587 break; 588 } 589 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 590 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 591 sa_dl.sdl_family = AF_LINK; 592 sa_dl.sdl_alen = ETHER_ADDR_LEN; 593 bcopy((void *)msg->data, LLADDR(&sa_dl), 594 ETHER_ADDR_LEN); 595 /* 596 * Netgraph is only permitted to join groups once 597 * via the if_addmulti() KPI, because it cannot hold 598 * struct ifmultiaddr * between calls. It may also 599 * lose a race while we check if the membership 600 * already exists. 601 */ 602 if_maddr_rlock(priv->ifp); 603 ifma = if_findmulti(priv->ifp, 604 (struct sockaddr *)&sa_dl); 605 if_maddr_runlock(priv->ifp); 606 if (ifma != NULL) { 607 error = EADDRINUSE; 608 } else { 609 error = if_addmulti(priv->ifp, 610 (struct sockaddr *)&sa_dl, &ifma); 611 } 612 break; 613 } 614 case NGM_ETHER_DEL_MULTI: 615 { 616 struct sockaddr_dl sa_dl; 617 618 if (msg->header.arglen != ETHER_ADDR_LEN) { 619 error = EINVAL; 620 break; 621 } 622 bzero(&sa_dl, sizeof(struct sockaddr_dl)); 623 sa_dl.sdl_len = sizeof(struct sockaddr_dl); 624 sa_dl.sdl_family = AF_LINK; 625 sa_dl.sdl_alen = ETHER_ADDR_LEN; 626 bcopy((void *)msg->data, LLADDR(&sa_dl), 627 ETHER_ADDR_LEN); 628 error = if_delmulti(priv->ifp, 629 (struct sockaddr *)&sa_dl); 630 break; 631 } 632 case NGM_ETHER_DETACH: 633 ng_ether_detach(priv->ifp); 634 break; 635 default: 636 error = EINVAL; 637 break; 638 } 639 break; 640 default: 641 error = EINVAL; 642 break; 643 } 644 NG_RESPOND_MSG(error, node, item, resp); 645 NG_FREE_MSG(msg); 646 return (error); 647 } 648 649 /* 650 * Receive data on a hook. 651 * Since we use per-hook recveive methods this should never be called. 652 */ 653 static int 654 ng_ether_rcvdata(hook_p hook, item_p item) 655 { 656 NG_FREE_ITEM(item); 657 658 panic("%s: weird hook", __func__); 659 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */ 660 return (0); 661 #endif 662 } 663 664 /* 665 * Handle an mbuf received on the "lower" or "orphan" hook. 666 */ 667 static int 668 ng_ether_rcv_lower(hook_p hook, item_p item) 669 { 670 struct mbuf *m; 671 const node_p node = NG_HOOK_NODE(hook); 672 const priv_p priv = NG_NODE_PRIVATE(node); 673 struct ifnet *const ifp = priv->ifp; 674 675 NGI_GET_M(item, m); 676 NG_FREE_ITEM(item); 677 678 /* Check whether interface is ready for packets */ 679 680 if (!((ifp->if_flags & IFF_UP) && 681 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 682 NG_FREE_M(m); 683 return (ENETDOWN); 684 } 685 686 /* Make sure header is fully pulled up */ 687 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 688 NG_FREE_M(m); 689 return (EINVAL); 690 } 691 if (m->m_len < sizeof(struct ether_header) 692 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 693 return (ENOBUFS); 694 695 /* Drop in the MAC address if desired */ 696 if (priv->autoSrcAddr) { 697 698 /* Make the mbuf writable if it's not already */ 699 if (!M_WRITABLE(m) 700 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 701 return (ENOBUFS); 702 703 /* Overwrite source MAC address */ 704 bcopy(IF_LLADDR(ifp), 705 mtod(m, struct ether_header *)->ether_shost, 706 ETHER_ADDR_LEN); 707 } 708 709 /* Send it on its way */ 710 return ether_output_frame(ifp, m); 711 } 712 713 /* 714 * Handle an mbuf received on the "upper" hook. 715 */ 716 static int 717 ng_ether_rcv_upper(hook_p hook, item_p item) 718 { 719 struct mbuf *m; 720 const node_p node = NG_HOOK_NODE(hook); 721 const priv_p priv = NG_NODE_PRIVATE(node); 722 struct ifnet *ifp = priv->ifp; 723 724 NGI_GET_M(item, m); 725 NG_FREE_ITEM(item); 726 727 /* Check length and pull off header */ 728 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 729 NG_FREE_M(m); 730 return (EINVAL); 731 } 732 if (m->m_len < sizeof(struct ether_header) && 733 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 734 return (ENOBUFS); 735 736 m->m_pkthdr.rcvif = ifp; 737 738 /* Pass the packet to the bridge, it may come back to us */ 739 if (ifp->if_bridge) { 740 BRIDGE_INPUT(ifp, m); 741 if (m == NULL) 742 return (0); 743 } 744 745 /* Route packet back in */ 746 ether_demux(ifp, m); 747 return (0); 748 } 749 750 /* 751 * Shutdown node. This resets the node but does not remove it 752 * unless the REALLY_DIE flag is set. 753 */ 754 static int 755 ng_ether_shutdown(node_p node) 756 { 757 const priv_p priv = NG_NODE_PRIVATE(node); 758 759 if (node->nd_flags & NGF_REALLY_DIE) { 760 /* 761 * WE came here because the ethernet card is being unloaded, 762 * so stop being persistant. 763 * Actually undo all the things we did on creation. 764 * Assume the ifp has already been freed. 765 */ 766 NG_NODE_SET_PRIVATE(node, NULL); 767 free(priv, M_NETGRAPH); 768 NG_NODE_UNREF(node); /* free node itself */ 769 return (0); 770 } 771 if (priv->promisc) { /* disable promiscuous mode */ 772 (void)ifpromisc(priv->ifp, 0); 773 priv->promisc = 0; 774 } 775 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */ 776 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 777 778 return (0); 779 } 780 781 /* 782 * Hook disconnection. 783 */ 784 static int 785 ng_ether_disconnect(hook_p hook) 786 { 787 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 788 789 if (hook == priv->upper) { 790 priv->upper = NULL; 791 if (priv->ifp != NULL) /* restore h/w csum */ 792 priv->ifp->if_hwassist = priv->hwassist; 793 } else if (hook == priv->lower) 794 priv->lower = NULL; 795 else if (hook == priv->orphan) 796 priv->orphan = NULL; 797 else 798 panic("%s: weird hook", __func__); 799 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 800 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 801 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 802 return (0); 803 } 804 805 /****************************************************************** 806 INITIALIZATION 807 ******************************************************************/ 808 809 /* 810 * Handle loading and unloading for this node type. 811 */ 812 static int 813 ng_ether_mod_event(module_t mod, int event, void *data) 814 { 815 int error = 0; 816 int s; 817 818 s = splnet(); 819 switch (event) { 820 case MOD_LOAD: 821 822 /* Register function hooks */ 823 if (ng_ether_attach_p != NULL) { 824 error = EEXIST; 825 break; 826 } 827 ng_ether_attach_p = ng_ether_attach; 828 ng_ether_detach_p = ng_ether_detach; 829 ng_ether_output_p = ng_ether_output; 830 ng_ether_input_p = ng_ether_input; 831 ng_ether_input_orphan_p = ng_ether_input_orphan; 832 ng_ether_link_state_p = ng_ether_link_state; 833 834 ng_ether_ifnet_arrival_cookie = 835 EVENTHANDLER_REGISTER(ifnet_arrival_event, 836 ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY); 837 break; 838 839 case MOD_UNLOAD: 840 841 /* 842 * Note that the base code won't try to unload us until 843 * all nodes have been removed, and that can't happen 844 * until all Ethernet interfaces are removed. In any 845 * case, we know there are no nodes left if the action 846 * is MOD_UNLOAD, so there's no need to detach any nodes. 847 */ 848 849 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, 850 ng_ether_ifnet_arrival_cookie); 851 852 /* Unregister function hooks */ 853 ng_ether_attach_p = NULL; 854 ng_ether_detach_p = NULL; 855 ng_ether_output_p = NULL; 856 ng_ether_input_p = NULL; 857 ng_ether_input_orphan_p = NULL; 858 ng_ether_link_state_p = NULL; 859 break; 860 861 default: 862 error = EOPNOTSUPP; 863 break; 864 } 865 splx(s); 866 return (error); 867 } 868 869 static void 870 vnet_ng_ether_init(const void *unused) 871 { 872 struct ifnet *ifp; 873 874 /* If module load was rejected, don't attach to vnets. */ 875 if (ng_ether_attach_p != ng_ether_attach) 876 return; 877 878 /* Create nodes for any already-existing Ethernet interfaces. */ 879 IFNET_RLOCK(); 880 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 881 if (ifp->if_type == IFT_ETHER 882 || ifp->if_type == IFT_L2VLAN) 883 ng_ether_attach(ifp); 884 } 885 IFNET_RUNLOCK(); 886 } 887 VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 888 vnet_ng_ether_init, NULL);
Cache object: de16445738aee2bea9ddd3366af8e3bc
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