sys/netgraph/ether/ng_ether.c

   1
   2 /*
   3  * ng_ether.c
   4  *
   5  * Copyright (c) 1996-2000 Whistle Communications, Inc.
   6  * All rights reserved.
   7  *
   8  * Subject to the following obligations and disclaimer of warranty, use and
   9  * redistribution of this software, in source or object code forms, with or
  10  * without modifications are expressly permitted by Whistle Communications;
  11  * provided, however, that:
  12  * 1. Any and all reproductions of the source or object code must include the
  13  *    copyright notice above and the following disclaimer of warranties; and
  14  * 2. No rights are granted, in any manner or form, to use Whistle
  15  *    Communications, Inc. trademarks, including the mark "WHISTLE
  16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
  17  *    such appears in the above copyright notice or in the software.
  18  *
  19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
  20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
  21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
  22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
  23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
  25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
  26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
  27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
  28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
  29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
  31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
  32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
  35  * OF SUCH DAMAGE.
  36  *
  37  * Authors: Archie Cobbs <archie@freebsd.org>
  38  *          Julian Elischer <julian@freebsd.org>
  39  *
  40  * $FreeBSD: src/sys/netgraph/ng_ether.c,v 1.2.2.13 2002/07/02 20:10:25 archie Exp $
  41  * $DragonFly: src/sys/netgraph/ether/ng_ether.c,v 1.11 2006/12/20 18:14:43 dillon Exp $
  42  */
  43
  44 /*
  45  * ng_ether(4) netgraph node type
  46  */
  47
  48 #include <sys/param.h>
  49 #include <sys/systm.h>
  50 #include <sys/kernel.h>
  51 #include <sys/malloc.h>
  52 #include <sys/mbuf.h>
  53 #include <sys/errno.h>
  54 #include <sys/syslog.h>
  55 #include <sys/socket.h>
  56 #include <sys/thread2.h>
  57
  58 #include <net/if.h>
  59 #include <net/if_types.h>
  60 #include <net/if_arp.h>
  61 #include <net/if_var.h>
  62 #include <net/ethernet.h>
  63
  64 #include <netgraph/ng_message.h>
  65 #include <netgraph/netgraph.h>
  66 #include <netgraph/ng_parse.h>
  67 #include "ng_ether.h"
  68
  69 #define IFP2AC(IFP)  ((struct arpcom *)IFP)
  70 #define IFP2NG(ifp)  (IFP2AC((ifp))->ac_netgraph)
  71
  72 /* Per-node private data */
  73 struct private {
  74         struct ifnet    *ifp;           /* associated interface */
  75         hook_p          upper;          /* upper hook connection */
  76         hook_p          lower;          /* lower OR orphan hook connection */
  77         u_char          lowerOrphan;    /* whether lower is lower or orphan */
  78         u_char          autoSrcAddr;    /* always overwrite source address */
  79         u_char          promisc;        /* promiscuous mode enabled */
  80         u_long          hwassist;       /* hardware checksum capabilities */
  81 };
  82 typedef struct private *priv_p;
  83
  84 /* Functional hooks called from if_ethersubr.c */
  85 static void     ng_ether_input(struct ifnet *ifp,
  86                     struct mbuf **mp, struct ether_header *eh);
  87 static void     ng_ether_input_orphan(struct ifnet *ifp,
  88                     struct mbuf *m, struct ether_header *eh);
  89 static int      ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
  90 static void     ng_ether_attach(struct ifnet *ifp);
  91 static void     ng_ether_detach(struct ifnet *ifp);
  92
  93 /* Other functions */
  94 static void     ng_ether_input2(node_p node,
  95                     struct mbuf **mp, struct ether_header *eh);
  96 static int      ng_ether_glueback_header(struct mbuf **mp,
  97                         struct ether_header *eh);
  98 static int      ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
  99 static int      ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
 100
 101 /* Netgraph node methods */
 102 static ng_constructor_t ng_ether_constructor;
 103 static ng_rcvmsg_t      ng_ether_rcvmsg;
 104 static ng_shutdown_t    ng_ether_rmnode;
 105 static ng_newhook_t     ng_ether_newhook;
 106 static ng_rcvdata_t     ng_ether_rcvdata;
 107 static ng_disconnect_t  ng_ether_disconnect;
 108 static int              ng_ether_mod_event(module_t mod, int event, void *data);
 109
 110 /* Parse type for an Ethernet address */
 111 static ng_parse_t       ng_enaddr_parse;
 112 static ng_unparse_t     ng_enaddr_unparse;
 113 const struct ng_parse_type ng_ether_enaddr_type = {
 114         NULL,
 115         NULL,
 116         NULL,
 117         ng_enaddr_parse,
 118         ng_enaddr_unparse,
 119         NULL,                   /* no such thing as a "default" EN address */
 120         0
 121 };
 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_ether_enaddr_type
 145         },
 146         {
 147           NGM_ETHER_COOKIE,
 148           NGM_ETHER_SET_ENADDR,
 149           "setenaddr",
 150           &ng_ether_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         { 0 }
 182 };
 183
 184 static struct ng_type ng_ether_typestruct = {
 185         NG_VERSION,
 186         NG_ETHER_NODE_TYPE,
 187         ng_ether_mod_event,
 188         ng_ether_constructor,
 189         ng_ether_rcvmsg,
 190         ng_ether_rmnode,
 191         ng_ether_newhook,
 192         NULL,
 193         NULL,
 194         ng_ether_rcvdata,
 195         ng_ether_rcvdata,
 196         ng_ether_disconnect,
 197         ng_ether_cmdlist,
 198 };
 199 NETGRAPH_INIT(ether, &ng_ether_typestruct);
 200
 201 /******************************************************************
 202                     ETHERNET FUNCTION HOOKS
 203 ******************************************************************/
 204
 205 /*
 206  * Handle a packet that has come in on an interface. We get to
 207  * look at it here before any upper layer protocols do.
 208  *
 209  * NOTE: this function will get called at splimp()
 210  */
 211 static void
 212 ng_ether_input(struct ifnet *ifp,
 213         struct mbuf **mp, struct ether_header *eh)
 214 {
 215         const node_p node = IFP2NG(ifp);
 216         const priv_p priv = node->private;
 217
 218         /* If "lower" hook not connected, let packet continue */
 219         if (priv->lower == NULL || priv->lowerOrphan)
 220                 return;
 221         ng_ether_input2(node, mp, eh);
 222 }
 223
 224 /*
 225  * Handle a packet that has come in on an interface, and which
 226  * does not match any of our known protocols (an ``orphan'').
 227  *
 228  * NOTE: this function will get called at splimp()
 229  */
 230 static void
 231 ng_ether_input_orphan(struct ifnet *ifp,
 232         struct mbuf *m, struct ether_header *eh)
 233 {
 234         const node_p node = IFP2NG(ifp);
 235         const priv_p priv = node->private;
 236
 237         /* If "orphan" hook not connected, let packet continue */
 238         if (priv->lower == NULL || !priv->lowerOrphan) {
 239                 m_freem(m);
 240                 return;
 241         }
 242         ng_ether_input2(node, &m, eh);
 243         if (m != NULL)
 244                 m_freem(m);
 245 }
 246
 247 /*
 248  * Handle a packet that has come in on an interface.
 249  * The Ethernet header has already been detached from the mbuf,
 250  * so we have to put it back.
 251  *
 252  * NOTE: this function will get called at splimp()
 253  */
 254 static void
 255 ng_ether_input2(node_p node, struct mbuf **mp, struct ether_header *eh)
 256 {
 257         const priv_p priv = node->private;
 258         meta_p meta = NULL;
 259         int error;
 260
 261         /* Glue Ethernet header back on */
 262         if ((error = ng_ether_glueback_header(mp, eh)) != 0)
 263                 return;
 264
 265         /* Send out lower/orphan hook */
 266         ng_queue_data(priv->lower, *mp, meta);
 267         *mp = NULL;
 268 }
 269
 270 /*
 271  * Handle a packet that is going out on an interface.
 272  * The Ethernet header is already attached to the mbuf.
 273  */
 274 static int
 275 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
 276 {
 277         const node_p node = IFP2NG(ifp);
 278         const priv_p priv = node->private;
 279         meta_p meta = NULL;
 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(error, priv->upper, *mp, meta);
 288         *mp = NULL;
 289         return (error);
 290 }
 291
 292 /*
 293  * A new Ethernet interface has been attached.
 294  * Create a new node for it, etc.
 295  */
 296 static void
 297 ng_ether_attach(struct ifnet *ifp)
 298 {
 299         char name[IFNAMSIZ + 1];
 300         priv_p priv;
 301         node_p node;
 302
 303         /* Create node */
 304         KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
 305         strlcpy(name, ifp->if_xname, sizeof(name));
 306         if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
 307                 log(LOG_ERR, "%s: can't %s for %s\n",
 308                     __func__, "create node", name);
 309                 return;
 310         }
 311
 312         /* Allocate private data */
 313         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
 314         if (priv == NULL) {
 315                 log(LOG_ERR, "%s: can't %s for %s\n",
 316                     __func__, "allocate memory", name);
 317                 ng_unref(node);
 318                 return;
 319         }
 320         bzero(priv, sizeof(*priv));
 321         node->private = priv;
 322         priv->ifp = ifp;
 323         IFP2NG(ifp) = node;
 324         priv->autoSrcAddr = 1;
 325         priv->hwassist = ifp->if_hwassist;
 326
 327         /* Try to give the node the same name as the interface */
 328         if (ng_name_node(node, name) != 0) {
 329                 log(LOG_WARNING, "%s: can't name node %s\n",
 330                     __func__, name);
 331         }
 332 }
 333
 334 /*
 335  * An Ethernet interface is being detached.
 336  * Destroy its node.
 337  */
 338 static void
 339 ng_ether_detach(struct ifnet *ifp)
 340 {
 341         const node_p node = IFP2NG(ifp);
 342         priv_p priv;
 343
 344         if (node == NULL)               /* no node (why not?), ignore */
 345                 return;
 346         ng_rmnode(node);                /* break all links to other nodes */
 347         node->flags |= NG_INVALID;
 348         ng_unname(node);                /* free name (and its reference) */
 349         IFP2NG(ifp) = NULL;             /* detach node from interface */
 350         priv = node->private;           /* free node private info */
 351         bzero(priv, sizeof(*priv));
 352         FREE(priv, M_NETGRAPH);
 353         node->private = NULL;
 354         ng_unref(node);                 /* free node itself */
 355 }
 356
 357 /*
 358  * Optimization for gluing the Ethernet header back onto
 359  * the front of an incoming packet.
 360  */
 361 static int
 362 ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh)
 363 {
 364         struct mbuf *m = *mp;
 365         int error = 0;
 366
 367         /*
 368          * Optimize for the case where the header is already in place
 369          * at the front of the mbuf. This is actually quite likely
 370          * because many Ethernet drivers generate packets this way.
 371          */
 372         if (eh == mtod(m, struct ether_header *) - 1) {
 373                 m->m_len += sizeof(*eh);
 374                 m->m_data -= sizeof(*eh);
 375                 m->m_pkthdr.len += sizeof(*eh);
 376                 goto done;
 377         }
 378
 379         /* Prepend the header back onto the front of the mbuf */
 380         M_PREPEND(m, sizeof(*eh), MB_DONTWAIT);
 381         if (m == NULL) {
 382                 error = ENOBUFS;
 383                 goto done;
 384         }
 385
 386         /* Copy header into front of mbuf */
 387         bcopy(eh, mtod(m, void *), sizeof(*eh));
 388
 389 done:
 390         /* Done */
 391         *mp = m;
 392         return error;
 393 }
 394
 395 /******************************************************************
 396                     NETGRAPH NODE METHODS
 397 ******************************************************************/
 398
 399 /*
 400  * It is not possible or allowable to create a node of this type.
 401  * Nodes get created when the interface is attached (or, when
 402  * this node type's KLD is loaded).
 403  */
 404 static int
 405 ng_ether_constructor(node_p *nodep)
 406 {
 407         return (EINVAL);
 408 }
 409
 410 /*
 411  * Check for attaching a new hook.
 412  */
 413 static  int
 414 ng_ether_newhook(node_p node, hook_p hook, const char *name)
 415 {
 416         const priv_p priv = node->private;
 417         u_char orphan = priv->lowerOrphan;
 418         hook_p *hookptr;
 419
 420         /* Divert hook is an alias for lower */
 421         if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
 422                 name = NG_ETHER_HOOK_LOWER;
 423
 424         /* Which hook? */
 425         if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
 426                 hookptr = &priv->upper;
 427         else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
 428                 hookptr = &priv->lower;
 429                 orphan = 0;
 430         } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
 431                 hookptr = &priv->lower;
 432                 orphan = 1;
 433         } else
 434                 return (EINVAL);
 435
 436         /* Check if already connected (shouldn't be, but doesn't hurt) */
 437         if (*hookptr != NULL)
 438                 return (EISCONN);
 439
 440         /* Disable hardware checksums while 'upper' hook is connected */
 441         if (hookptr == &priv->upper)
 442                 priv->ifp->if_hwassist = 0;
 443
 444         /* OK */
 445         *hookptr = hook;
 446         priv->lowerOrphan = orphan;
 447         return (0);
 448 }
 449
 450 /*
 451  * Receive an incoming control message.
 452  */
 453 static int
 454 ng_ether_rcvmsg(node_p node, struct ng_mesg *msg,
 455         const char *retaddr, struct ng_mesg **rptr)
 456 {
 457         const priv_p priv = node->private;
 458         struct ng_mesg *resp = NULL;
 459         int error = 0;
 460
 461         switch (msg->header.typecookie) {
 462         case NGM_ETHER_COOKIE:
 463                 switch (msg->header.cmd) {
 464                 case NGM_ETHER_GET_IFNAME:
 465                         NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
 466                         if (resp == NULL) {
 467                                 error = ENOMEM;
 468                                 break;
 469                         }
 470                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
 471                         break;
 472                 case NGM_ETHER_GET_IFINDEX:
 473                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
 474                         if (resp == NULL) {
 475                                 error = ENOMEM;
 476                                 break;
 477                         }
 478                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
 479                         break;
 480                 case NGM_ETHER_GET_ENADDR:
 481                         NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
 482                         if (resp == NULL) {
 483                                 error = ENOMEM;
 484                                 break;
 485                         }
 486                         bcopy((IFP2AC(priv->ifp))->ac_enaddr,
 487                             resp->data, ETHER_ADDR_LEN);
 488                         break;
 489                 case NGM_ETHER_SET_ENADDR:
 490                     {
 491                         if (msg->header.arglen != ETHER_ADDR_LEN) {
 492                                 error = EINVAL;
 493                                 break;
 494                         }
 495                         error = if_setlladdr(priv->ifp,
 496                             (u_char *)msg->data, ETHER_ADDR_LEN);
 497                         break;
 498                     }
 499                 case NGM_ETHER_GET_PROMISC:
 500                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
 501                         if (resp == NULL) {
 502                                 error = ENOMEM;
 503                                 break;
 504                         }
 505                         *((u_int32_t *)resp->data) = priv->promisc;
 506                         break;
 507                 case NGM_ETHER_SET_PROMISC:
 508                     {
 509                         u_char want;
 510
 511                         if (msg->header.arglen != sizeof(u_int32_t)) {
 512                                 error = EINVAL;
 513                                 break;
 514                         }
 515                         want = !!*((u_int32_t *)msg->data);
 516                         if (want ^ priv->promisc) {
 517                                 if ((error = ifpromisc(priv->ifp, want)) != 0)
 518                                         break;
 519                                 priv->promisc = want;
 520                         }
 521                         break;
 522                     }
 523                 case NGM_ETHER_GET_AUTOSRC:
 524                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
 525                         if (resp == NULL) {
 526                                 error = ENOMEM;
 527                                 break;
 528                         }
 529                         *((u_int32_t *)resp->data) = priv->autoSrcAddr;
 530                         break;
 531                 case NGM_ETHER_SET_AUTOSRC:
 532                         if (msg->header.arglen != sizeof(u_int32_t)) {
 533                                 error = EINVAL;
 534                                 break;
 535                         }
 536                         priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
 537                         break;
 538                 default:
 539                         error = EINVAL;
 540                         break;
 541                 }
 542                 break;
 543         default:
 544                 error = EINVAL;
 545                 break;
 546         }
 547         if (rptr)
 548                 *rptr = resp;
 549         else if (resp != NULL)
 550                 FREE(resp, M_NETGRAPH);
 551         FREE(msg, M_NETGRAPH);
 552         return (error);
 553 }
 554
 555 /*
 556  * Receive data on a hook.
 557  */
 558 static int
 559 ng_ether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
 560 {
 561         const node_p node = hook->node;
 562         const priv_p priv = node->private;
 563
 564         if (hook == priv->lower)
 565                 return ng_ether_rcv_lower(node, m, meta);
 566         if (hook == priv->upper)
 567                 return ng_ether_rcv_upper(node, m, meta);
 568         panic("%s: weird hook", __func__);
 569 }
 570
 571 /*
 572  * Handle an mbuf received on the "lower" hook.
 573  */
 574 static int
 575 ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
 576 {
 577         const priv_p priv = node->private;
 578         struct ifnet *const ifp = priv->ifp;
 579         int error;
 580
 581         /* Discard meta info */
 582         NG_FREE_META(meta);
 583
 584         /* Check whether interface is ready for packets */
 585         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
 586                 m_freem(m);
 587                 return (ENETDOWN);
 588         }
 589
 590         /* Make sure header is fully pulled up */
 591         if (m->m_pkthdr.len < sizeof(struct ether_header)) {
 592                 m_freem(m);
 593                 return (EINVAL);
 594         }
 595         if (m->m_len < sizeof(struct ether_header)
 596             && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
 597                 return (ENOBUFS);
 598
 599         /* Drop in the MAC address if desired */
 600         if (priv->autoSrcAddr) {
 601
 602                 /* Make the mbuf writable if it's not already */
 603                 if (!M_WRITABLE(m)
 604                     && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
 605                         return (ENOBUFS);
 606
 607                 /* Overwrite source MAC address */
 608                 bcopy((IFP2AC(ifp))->ac_enaddr,
 609                     mtod(m, struct ether_header *)->ether_shost,
 610                     ETHER_ADDR_LEN);
 611         }
 612
 613         /* Send it on its way */
 614         lwkt_serialize_enter(ifp->if_serializer);
 615         error = ether_output_frame(ifp, m);
 616         lwkt_serialize_exit(ifp->if_serializer);
 617
 618         return (error);
 619 }
 620
 621 /*
 622  * Handle an mbuf received on the "upper" hook.
 623  */
 624 static int
 625 ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
 626 {
 627         const priv_p priv = node->private;
 628         struct ether_header *eh;
 629
 630         /* Discard meta info */
 631         NG_FREE_META(meta);
 632
 633         /* Check length and pull off header */
 634         if (m->m_pkthdr.len < sizeof(*eh)) {
 635                 m_freem(m);
 636                 return (EINVAL);
 637         }
 638         if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL)
 639                 return (ENOBUFS);
 640         eh = mtod(m, struct ether_header *);
 641         m->m_data += sizeof(*eh);
 642         m->m_len -= sizeof(*eh);
 643         m->m_pkthdr.len -= sizeof(*eh);
 644         m->m_pkthdr.rcvif = priv->ifp;
 645
 646         /* Route packet back in */
 647         lwkt_serialize_enter(priv->ifp->if_serializer);
 648         ether_demux(priv->ifp, eh, m);
 649         lwkt_serialize_exit(priv->ifp->if_serializer);
 650         return (0);
 651 }
 652
 653 /*
 654  * Shutdown node. This resets the node but does not remove it.
 655  */
 656 static int
 657 ng_ether_rmnode(node_p node)
 658 {
 659         const priv_p priv = node->private;
 660
 661         ng_cutlinks(node);
 662         node->flags &= ~NG_INVALID;     /* bounce back to life */
 663         if (priv->promisc) {            /* disable promiscuous mode */
 664                 ifpromisc(priv->ifp, 0);
 665                 priv->promisc = 0;
 666         }
 667         priv->autoSrcAddr = 1;          /* reset auto-src-addr flag */
 668         return (0);
 669 }
 670
 671 /*
 672  * Hook disconnection.
 673  */
 674 static int
 675 ng_ether_disconnect(hook_p hook)
 676 {
 677         const priv_p priv = hook->node->private;
 678
 679         if (hook == priv->upper) {
 680                 priv->upper = NULL;
 681                 priv->ifp->if_hwassist = priv->hwassist;  /* restore h/w csum */
 682         } else if (hook == priv->lower) {
 683                 priv->lower = NULL;
 684                 priv->lowerOrphan = 0;
 685         } else
 686                 panic("%s: weird hook", __func__);
 687         if (hook->node->numhooks == 0)
 688                 ng_rmnode(hook->node);  /* reset node */
 689         return (0);
 690 }
 691
 692 static int
 693 ng_enaddr_parse(const struct ng_parse_type *type,
 694         const char *s, int *const off, const u_char *const start,
 695         u_char *const buf, int *const buflen)
 696 {
 697         char *eptr;
 698         u_long val;
 699         int i;
 700
 701         if (*buflen < ETHER_ADDR_LEN)
 702                 return (ERANGE);
 703         for (i = 0; i < ETHER_ADDR_LEN; i++) {
 704                 val = strtoul(s + *off, &eptr, 16);
 705                 if (val > 0xff || eptr == s + *off)
 706                         return (EINVAL);
 707                 buf[i] = (u_char)val;
 708                 *off = (eptr - s);
 709                 if (i < ETHER_ADDR_LEN - 1) {
 710                         if (*eptr != ':')
 711                                 return (EINVAL);
 712                         (*off)++;
 713                 }
 714         }
 715         *buflen = ETHER_ADDR_LEN;
 716         return (0);
 717 }
 718
 719 static int
 720 ng_enaddr_unparse(const struct ng_parse_type *type,
 721         const u_char *data, int *off, char *cbuf, int cbuflen)
 722 {
 723         int len;
 724
 725         len = ksnprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
 726             data[*off], data[*off + 1], data[*off + 2],
 727             data[*off + 3], data[*off + 4], data[*off + 5]);
 728         if (len >= cbuflen)
 729                 return (ERANGE);
 730         *off += ETHER_ADDR_LEN;
 731         return (0);
 732 }
 733
 734 /******************************************************************
 735                         INITIALIZATION
 736 ******************************************************************/
 737
 738 /*
 739  * Handle loading and unloading for this node type.
 740  */
 741 static int
 742 ng_ether_mod_event(module_t mod, int event, void *data)
 743 {
 744         struct ifnet *ifp;
 745         int error = 0;
 746
 747         crit_enter();
 748         switch (event) {
 749         case MOD_LOAD:
 750
 751                 /* Register function hooks */
 752                 if (ng_ether_attach_p != NULL) {
 753                         error = EEXIST;
 754                         break;
 755                 }
 756                 ng_ether_attach_p = ng_ether_attach;
 757                 ng_ether_detach_p = ng_ether_detach;
 758                 ng_ether_output_p = ng_ether_output;
 759                 ng_ether_input_p = ng_ether_input;
 760                 ng_ether_input_orphan_p = ng_ether_input_orphan;
 761
 762                 /* Create nodes for any already-existing Ethernet interfaces */
 763                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
 764                         if (ifp->if_type == IFT_ETHER ||
 765                             ifp->if_type == IFT_L2VLAN)
 766                                 ng_ether_attach(ifp);
 767                 }
 768                 break;
 769
 770         case MOD_UNLOAD:
 771
 772                 /*
 773                  * Note that the base code won't try to unload us until
 774                  * all nodes have been removed, and that can't happen
 775                  * until all Ethernet interfaces are removed. In any
 776                  * case, we know there are no nodes left if the action
 777                  * is MOD_UNLOAD, so there's no need to detach any nodes.
 778                  */
 779
 780                 /* Unregister function hooks */
 781                 ng_ether_attach_p = NULL;
 782                 ng_ether_detach_p = NULL;
 783                 ng_ether_output_p = NULL;
 784                 ng_ether_input_p = NULL;
 785                 ng_ether_input_orphan_p = NULL;
 786                 break;
 787
 788         default:
 789                 error = EOPNOTSUPP;
 790                 break;
 791         }
 792         crit_exit();
 793         return (error);
 794 }
 795