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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 * $FreeBSD$ 43 */ 44 45 /* 46 * ng_ether(4) netgraph node type 47 */ 48 49 #include <sys/param.h> 50 #include <sys/eventhandler.h> 51 #include <sys/systm.h> 52 #include <sys/kernel.h> 53 #include <sys/malloc.h> 54 #include <sys/mbuf.h> 55 #include <sys/errno.h> 56 #include <sys/proc.h> 57 #include <sys/syslog.h> 58 #include <sys/socket.h> 59 #include <sys/taskqueue.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/vnet.h> 69 70 #include <netgraph/ng_message.h> 71 #include <netgraph/netgraph.h> 72 #include <netgraph/ng_parse.h> 73 #include <netgraph/ng_ether.h> 74 75 MODULE_VERSION(ng_ether, 1); 76 77 #define IFP2NG(ifp) ((ifp)->if_l2com) 78 79 /* Per-node private data */ 80 struct private { 81 struct ifnet *ifp; /* associated interface */ 82 hook_p upper; /* upper hook connection */ 83 hook_p lower; /* lower hook connection */ 84 hook_p orphan; /* orphan hook connection */ 85 u_char autoSrcAddr; /* always overwrite source address */ 86 u_char promisc; /* promiscuous mode enabled */ 87 u_long hwassist; /* hardware checksum capabilities */ 88 u_int flags; /* flags e.g. really die */ 89 }; 90 typedef struct private *priv_p; 91 92 /* Hook pointers used by if_ethersubr.c to callback to netgraph */ 93 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 94 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 95 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 96 extern void (*ng_ether_attach_p)(struct ifnet *ifp); 97 extern void (*ng_ether_detach_p)(struct ifnet *ifp); 98 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 99 100 /* Functional hooks called from if_ethersubr.c */ 101 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp); 102 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m); 103 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp); 104 static void ng_ether_attach(struct ifnet *ifp); 105 static void ng_ether_detach(struct ifnet *ifp); 106 static void ng_ether_link_state(struct ifnet *ifp, int state); 107 108 /* Other functions */ 109 static int ng_ether_rcv_lower(hook_p node, item_p item); 110 static int ng_ether_rcv_upper(hook_p node, item_p item); 111 112 /* Netgraph node methods */ 113 static ng_constructor_t ng_ether_constructor; 114 static ng_rcvmsg_t ng_ether_rcvmsg; 115 static ng_shutdown_t ng_ether_shutdown; 116 static ng_newhook_t ng_ether_newhook; 117 static ng_rcvdata_t ng_ether_rcvdata; 118 static ng_disconnect_t ng_ether_disconnect; 119 static int ng_ether_mod_event(module_t mod, int event, void *data); 120 121 static eventhandler_tag ng_ether_ifnet_arrival_cookie; 122 123 /* List of commands and how to convert arguments to/from ASCII */ 124 static const struct ng_cmdlist ng_ether_cmdlist[] = { 125 { 126 NGM_ETHER_COOKIE, 127 NGM_ETHER_GET_IFNAME, 128 "getifname", 129 NULL, 130 &ng_parse_string_type 131 }, 132 { 133 NGM_ETHER_COOKIE, 134 NGM_ETHER_GET_IFINDEX, 135 "getifindex", 136 NULL, 137 &ng_parse_int32_type 138 }, 139 { 140 NGM_ETHER_COOKIE, 141 NGM_ETHER_GET_ENADDR, 142 "getenaddr", 143 NULL, 144 &ng_parse_enaddr_type 145 }, 146 { 147 NGM_ETHER_COOKIE, 148 NGM_ETHER_SET_ENADDR, 149 "setenaddr", 150 &ng_parse_enaddr_type, 151 NULL 152 }, 153 { 154 NGM_ETHER_COOKIE, 155 NGM_ETHER_GET_PROMISC, 156 "getpromisc", 157 NULL, 158 &ng_parse_int32_type 159 }, 160 { 161 NGM_ETHER_COOKIE, 162 NGM_ETHER_SET_PROMISC, 163 "setpromisc", 164 &ng_parse_int32_type, 165 NULL 166 }, 167 { 168 NGM_ETHER_COOKIE, 169 NGM_ETHER_GET_AUTOSRC, 170 "getautosrc", 171 NULL, 172 &ng_parse_int32_type 173 }, 174 { 175 NGM_ETHER_COOKIE, 176 NGM_ETHER_SET_AUTOSRC, 177 "setautosrc", 178 &ng_parse_int32_type, 179 NULL 180 }, 181 { 182 NGM_ETHER_COOKIE, 183 NGM_ETHER_ADD_MULTI, 184 "addmulti", 185 &ng_parse_enaddr_type, 186 NULL 187 }, 188 { 189 NGM_ETHER_COOKIE, 190 NGM_ETHER_DEL_MULTI, 191 "delmulti", 192 &ng_parse_enaddr_type, 193 NULL 194 }, 195 { 196 NGM_ETHER_COOKIE, 197 NGM_ETHER_DETACH, 198 "detach", 199 NULL, 200 NULL 201 }, 202 { 0 } 203 }; 204 205 static struct ng_type ng_ether_typestruct = { 206 .version = NG_ABI_VERSION, 207 .name = NG_ETHER_NODE_TYPE, 208 .mod_event = ng_ether_mod_event, 209 .constructor = ng_ether_constructor, 210 .rcvmsg = ng_ether_rcvmsg, 211 .shutdown = ng_ether_shutdown, 212 .newhook = ng_ether_newhook, 213 .rcvdata = ng_ether_rcvdata, 214 .disconnect = ng_ether_disconnect, 215 .cmdlist = ng_ether_cmdlist, 216 }; 217 NETGRAPH_INIT(ether, &ng_ether_typestruct); 218 219 /****************************************************************** 220 UTILITY FUNCTIONS 221 ******************************************************************/ 222 static void 223 ng_ether_sanitize_ifname(const char *ifname, char *name) 224 { 225 int i; 226 227 for (i = 0; i < IFNAMSIZ; i++) { 228 if (ifname[i] == '.' || ifname[i] == ':') 229 name[i] = '_'; 230 else 231 name[i] = ifname[i]; 232 if (name[i] == '\0') 233 break; 234 } 235 } 236 237 /****************************************************************** 238 ETHERNET FUNCTION HOOKS 239 ******************************************************************/ 240 241 /* 242 * Handle a packet that has come in on an interface. We get to 243 * look at it here before any upper layer protocols do. 244 */ 245 static void 246 ng_ether_input(struct ifnet *ifp, struct mbuf **mp) 247 { 248 const node_p node = IFP2NG(ifp); 249 const priv_p priv = NG_NODE_PRIVATE(node); 250 int error; 251 252 /* If "lower" hook not connected, let packet continue */ 253 if (priv->lower == NULL) 254 return; 255 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */ 256 } 257 258 /* 259 * Handle a packet that has come in on an interface, and which 260 * does not match any of our known protocols (an ``orphan''). 261 */ 262 static void 263 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m) 264 { 265 const node_p node = IFP2NG(ifp); 266 const priv_p priv = NG_NODE_PRIVATE(node); 267 int error; 268 269 /* If "orphan" hook not connected, discard packet */ 270 if (priv->orphan == NULL) { 271 m_freem(m); 272 return; 273 } 274 NG_SEND_DATA_ONLY(error, priv->orphan, m); 275 } 276 277 /* 278 * Handle a packet that is going out on an interface. 279 * The Ethernet header is already attached to the mbuf. 280 */ 281 static int 282 ng_ether_output(struct ifnet *ifp, struct mbuf **mp) 283 { 284 const node_p node = IFP2NG(ifp); 285 const priv_p priv = NG_NODE_PRIVATE(node); 286 int error = 0; 287 288 /* If "upper" hook not connected, let packet continue */ 289 if (priv->upper == NULL) 290 return (0); 291 292 /* Send it out "upper" hook */ 293 NG_OUTBOUND_THREAD_REF(); 294 NG_SEND_DATA_ONLY(error, priv->upper, *mp); 295 NG_OUTBOUND_THREAD_UNREF(); 296 return (error); 297 } 298 299 /* 300 * A new Ethernet interface has been attached. 301 * Create a new node for it, etc. 302 */ 303 static void 304 ng_ether_attach(struct ifnet *ifp) 305 { 306 char name[IFNAMSIZ]; 307 priv_p priv; 308 node_p node; 309 310 /* 311 * Do not create / attach an ether node to this ifnet if 312 * a netgraph node with the same name already exists. 313 * This should prevent ether nodes to become attached to 314 * eiface nodes, which may be problematic due to naming 315 * clashes. 316 */ 317 ng_ether_sanitize_ifname(ifp->if_xname, name); 318 if ((node = ng_name2noderef(NULL, name)) != 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 if (ng_name_node(node, name) != 0) 346 log(LOG_WARNING, "%s: can't name node %s\n", __func__, name); 347 } 348 349 /* 350 * An Ethernet interface is being detached. 351 * REALLY Destroy its node. 352 */ 353 static void 354 ng_ether_detach(struct ifnet *ifp) 355 { 356 const node_p node = IFP2NG(ifp); 357 const priv_p priv = NG_NODE_PRIVATE(node); 358 359 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 360 NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 361 /* 362 * We can't assume the ifnet is still around when we run shutdown 363 * So zap it now. XXX We HOPE that anything running at this time 364 * handles it (as it should in the non netgraph case). 365 */ 366 IFP2NG(ifp) = NULL; 367 priv->ifp = NULL; /* XXX race if interrupted an output packet */ 368 ng_rmnode_self(node); /* remove all netgraph parts */ 369 } 370 371 /* 372 * Notify graph about link event. 373 * if_link_state_change() has already checked that the state has changed. 374 */ 375 static void 376 ng_ether_link_state(struct ifnet *ifp, int state) 377 { 378 const node_p node = IFP2NG(ifp); 379 const priv_p priv = NG_NODE_PRIVATE(node); 380 struct ng_mesg *msg; 381 int cmd, dummy_error = 0; 382 383 if (state == LINK_STATE_UP) 384 cmd = NGM_LINK_IS_UP; 385 else if (state == LINK_STATE_DOWN) 386 cmd = NGM_LINK_IS_DOWN; 387 else 388 return; 389 390 if (priv->lower != NULL) { 391 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 392 if (msg != NULL) 393 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0); 394 } 395 if (priv->orphan != NULL) { 396 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 397 if (msg != NULL) 398 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0); 399 } 400 } 401 402 /* 403 * Interface arrival notification handler. 404 * The notification is produced in two cases: 405 * o a new interface arrives 406 * o an existing interface got renamed 407 * Currently the first case is handled by ng_ether_attach via special 408 * hook ng_ether_attach_p. 409 */ 410 static void 411 ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp) 412 { 413 char name[IFNAMSIZ]; 414 node_p node; 415 416 /* Only ethernet interfaces are of interest. */ 417 if (ifp->if_type != IFT_ETHER && 418 ifp->if_type != IFT_L2VLAN && 419 ifp->if_type != IFT_BRIDGE) 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 break; 539 } 540 case NGM_ETHER_GET_PROMISC: 541 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 542 if (resp == NULL) { 543 error = ENOMEM; 544 break; 545 } 546 *((u_int32_t *)resp->data) = priv->promisc; 547 break; 548 case NGM_ETHER_SET_PROMISC: 549 { 550 u_char want; 551 552 if (msg->header.arglen != sizeof(u_int32_t)) { 553 error = EINVAL; 554 break; 555 } 556 want = !!*((u_int32_t *)msg->data); 557 if (want ^ priv->promisc) { 558 if ((error = ifpromisc(priv->ifp, want)) != 0) 559 break; 560 priv->promisc = want; 561 } 562 break; 563 } 564 case NGM_ETHER_GET_AUTOSRC: 565 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 566 if (resp == NULL) { 567 error = ENOMEM; 568 break; 569 } 570 *((u_int32_t *)resp->data) = priv->autoSrcAddr; 571 break; 572 case NGM_ETHER_SET_AUTOSRC: 573 if (msg->header.arglen != sizeof(u_int32_t)) { 574 error = EINVAL; 575 break; 576 } 577 priv->autoSrcAddr = !!*((u_int32_t *)msg->data); 578 break; 579 case NGM_ETHER_ADD_MULTI: 580 { 581 struct sockaddr_dl sa_dl; 582 struct epoch_tracker et; 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 NET_EPOCH_ENTER(et); 603 ifma = if_findmulti(priv->ifp, 604 (struct sockaddr *)&sa_dl); 605 NET_EPOCH_EXIT(et); 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 } 660 661 /* 662 * Handle an mbuf received on the "lower" or "orphan" hook. 663 */ 664 static int 665 ng_ether_rcv_lower(hook_p hook, item_p item) 666 { 667 struct mbuf *m; 668 const node_p node = NG_HOOK_NODE(hook); 669 const priv_p priv = NG_NODE_PRIVATE(node); 670 struct ifnet *const ifp = priv->ifp; 671 672 NGI_GET_M(item, m); 673 NG_FREE_ITEM(item); 674 675 /* Check whether interface is ready for packets */ 676 677 if (!((ifp->if_flags & IFF_UP) && 678 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 679 NG_FREE_M(m); 680 return (ENETDOWN); 681 } 682 683 /* Make sure header is fully pulled up */ 684 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 685 NG_FREE_M(m); 686 return (EINVAL); 687 } 688 if (m->m_len < sizeof(struct ether_header) 689 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 690 return (ENOBUFS); 691 692 /* Drop in the MAC address if desired */ 693 if (priv->autoSrcAddr) { 694 /* Make the mbuf writable if it's not already */ 695 if (!M_WRITABLE(m) 696 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 697 return (ENOBUFS); 698 699 /* Overwrite source MAC address */ 700 bcopy(IF_LLADDR(ifp), 701 mtod(m, struct ether_header *)->ether_shost, 702 ETHER_ADDR_LEN); 703 } 704 705 /* Send it on its way */ 706 return ether_output_frame(ifp, m); 707 } 708 709 /* 710 * Handle an mbuf received on the "upper" hook. 711 */ 712 static int 713 ng_ether_rcv_upper(hook_p hook, item_p item) 714 { 715 struct mbuf *m; 716 const node_p node = NG_HOOK_NODE(hook); 717 const priv_p priv = NG_NODE_PRIVATE(node); 718 struct ifnet *ifp = priv->ifp; 719 720 NGI_GET_M(item, m); 721 NG_FREE_ITEM(item); 722 723 /* Check length and pull off header */ 724 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 725 NG_FREE_M(m); 726 return (EINVAL); 727 } 728 if (m->m_len < sizeof(struct ether_header) && 729 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) 730 return (ENOBUFS); 731 732 m->m_pkthdr.rcvif = ifp; 733 734 /* Pass the packet to the bridge, it may come back to us */ 735 if (ifp->if_bridge) { 736 BRIDGE_INPUT(ifp, m); 737 if (m == NULL) 738 return (0); 739 } 740 741 /* Route packet back in */ 742 ether_demux(ifp, m); 743 return (0); 744 } 745 746 /* 747 * Shutdown node. This resets the node but does not remove it 748 * unless the REALLY_DIE flag is set. 749 */ 750 static int 751 ng_ether_shutdown(node_p node) 752 { 753 const priv_p priv = NG_NODE_PRIVATE(node); 754 755 if (node->nd_flags & NGF_REALLY_DIE) { 756 /* 757 * The ifnet is going away, perhaps because the driver was 758 * unloaded or its vnet is being torn down. 759 */ 760 NG_NODE_SET_PRIVATE(node, NULL); 761 if (priv->ifp != NULL) 762 IFP2NG(priv->ifp) = NULL; 763 free(priv, M_NETGRAPH); 764 NG_NODE_UNREF(node); /* free node itself */ 765 return (0); 766 } 767 if (priv->promisc) { /* disable promiscuous mode */ 768 (void)ifpromisc(priv->ifp, 0); 769 priv->promisc = 0; 770 } 771 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 772 773 return (0); 774 } 775 776 /* 777 * Hook disconnection. 778 */ 779 static int 780 ng_ether_disconnect(hook_p hook) 781 { 782 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 783 784 if (hook == priv->upper) { 785 priv->upper = NULL; 786 if (priv->ifp != NULL) /* restore h/w csum */ 787 priv->ifp->if_hwassist = priv->hwassist; 788 } else if (hook == priv->lower) 789 priv->lower = NULL; 790 else if (hook == priv->orphan) 791 priv->orphan = NULL; 792 else 793 panic("%s: weird hook", __func__); 794 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 795 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 796 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 797 return (0); 798 } 799 800 /****************************************************************** 801 INITIALIZATION 802 ******************************************************************/ 803 804 /* 805 * Handle loading and unloading for this node type. 806 */ 807 static int 808 ng_ether_mod_event(module_t mod, int event, void *data) 809 { 810 int error = 0; 811 812 switch (event) { 813 case MOD_LOAD: 814 815 /* Register function hooks */ 816 if (ng_ether_attach_p != NULL) { 817 error = EEXIST; 818 break; 819 } 820 ng_ether_attach_p = ng_ether_attach; 821 ng_ether_detach_p = ng_ether_detach; 822 ng_ether_output_p = ng_ether_output; 823 ng_ether_input_p = ng_ether_input; 824 ng_ether_input_orphan_p = ng_ether_input_orphan; 825 ng_ether_link_state_p = ng_ether_link_state; 826 827 ng_ether_ifnet_arrival_cookie = 828 EVENTHANDLER_REGISTER(ifnet_arrival_event, 829 ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY); 830 break; 831 832 case MOD_UNLOAD: 833 834 /* 835 * Note that the base code won't try to unload us until 836 * all nodes have been removed, and that can't happen 837 * until all Ethernet interfaces are removed. In any 838 * case, we know there are no nodes left if the action 839 * is MOD_UNLOAD, so there's no need to detach any nodes. 840 */ 841 842 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, 843 ng_ether_ifnet_arrival_cookie); 844 845 /* Unregister function hooks */ 846 ng_ether_attach_p = NULL; 847 ng_ether_detach_p = NULL; 848 ng_ether_output_p = NULL; 849 ng_ether_input_p = NULL; 850 ng_ether_input_orphan_p = NULL; 851 ng_ether_link_state_p = NULL; 852 break; 853 854 default: 855 error = EOPNOTSUPP; 856 break; 857 } 858 return (error); 859 } 860 861 static void 862 vnet_ng_ether_init(const void *unused) 863 { 864 struct ifnet *ifp; 865 866 /* If module load was rejected, don't attach to vnets. */ 867 if (ng_ether_attach_p != ng_ether_attach) 868 return; 869 870 /* Create nodes for any already-existing Ethernet interfaces. */ 871 IFNET_RLOCK(); 872 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 873 if (ifp->if_type == IFT_ETHER || 874 ifp->if_type == IFT_L2VLAN || 875 ifp->if_type == IFT_BRIDGE) 876 ng_ether_attach(ifp); 877 } 878 IFNET_RUNLOCK(); 879 } 880 VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 881 vnet_ng_ether_init, NULL);
Cache object: 18389e5986e83ead8ab9e838b9922ddd
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