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 1.17 2008/07/27 10:06:57 sephe 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, struct mbuf **mp);
  86 static void     ng_ether_input_orphan(struct ifnet *ifp,
  87                     struct mbuf *m, const struct ether_header *eh);
  88 static int      ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
  89 static void     ng_ether_attach(struct ifnet *ifp);
  90 static void     ng_ether_detach(struct ifnet *ifp);
  91
  92 /* Other functions */
  93 static void     ng_ether_input2(node_p node,
  94                     struct mbuf **mp, const struct ether_header *eh);
  95 static int      ng_ether_glueback_header(struct mbuf **mp,
  96                         const struct ether_header *eh);
  97 static int      ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
  98 static int      ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
  99
 100 /* Netgraph node methods */
 101 static ng_constructor_t ng_ether_constructor;
 102 static ng_rcvmsg_t      ng_ether_rcvmsg;
 103 static ng_shutdown_t    ng_ether_rmnode;
 104 static ng_newhook_t     ng_ether_newhook;
 105 static ng_rcvdata_t     ng_ether_rcvdata;
 106 static ng_disconnect_t  ng_ether_disconnect;
 107 static int              ng_ether_mod_event(module_t mod, int event, void *data);
 108
 109 /* Parse type for an Ethernet address */
 110 static ng_parse_t       ng_enaddr_parse;
 111 static ng_unparse_t     ng_enaddr_unparse;
 112 const struct ng_parse_type ng_ether_enaddr_type = {
 113         NULL,
 114         NULL,
 115         NULL,
 116         ng_enaddr_parse,
 117         ng_enaddr_unparse,
 118         NULL,                   /* no such thing as a "default" EN address */
 119         0
 120 };
 121
 122 /* List of commands and how to convert arguments to/from ASCII */
 123 static const struct ng_cmdlist ng_ether_cmdlist[] = {
 124         {
 125           NGM_ETHER_COOKIE,
 126           NGM_ETHER_GET_IFNAME,
 127           "getifname",
 128           NULL,
 129           &ng_parse_string_type
 130         },
 131         {
 132           NGM_ETHER_COOKIE,
 133           NGM_ETHER_GET_IFINDEX,
 134           "getifindex",
 135           NULL,
 136           &ng_parse_int32_type
 137         },
 138         {
 139           NGM_ETHER_COOKIE,
 140           NGM_ETHER_GET_ENADDR,
 141           "getenaddr",
 142           NULL,
 143           &ng_ether_enaddr_type
 144         },
 145         {
 146           NGM_ETHER_COOKIE,
 147           NGM_ETHER_SET_ENADDR,
 148           "setenaddr",
 149           &ng_ether_enaddr_type,
 150           NULL
 151         },
 152         {
 153           NGM_ETHER_COOKIE,
 154           NGM_ETHER_GET_PROMISC,
 155           "getpromisc",
 156           NULL,
 157           &ng_parse_int32_type
 158         },
 159         {
 160           NGM_ETHER_COOKIE,
 161           NGM_ETHER_SET_PROMISC,
 162           "setpromisc",
 163           &ng_parse_int32_type,
 164           NULL
 165         },
 166         {
 167           NGM_ETHER_COOKIE,
 168           NGM_ETHER_GET_AUTOSRC,
 169           "getautosrc",
 170           NULL,
 171           &ng_parse_int32_type
 172         },
 173         {
 174           NGM_ETHER_COOKIE,
 175           NGM_ETHER_SET_AUTOSRC,
 176           "setautosrc",
 177           &ng_parse_int32_type,
 178           NULL
 179         },
 180         { 0 }
 181 };
 182
 183 static struct ng_type ng_ether_typestruct = {
 184         NG_VERSION,
 185         NG_ETHER_NODE_TYPE,
 186         ng_ether_mod_event,
 187         ng_ether_constructor,
 188         ng_ether_rcvmsg,
 189         ng_ether_rmnode,
 190         ng_ether_newhook,
 191         NULL,
 192         NULL,
 193         ng_ether_rcvdata,
 194         ng_ether_rcvdata,
 195         ng_ether_disconnect,
 196         ng_ether_cmdlist,
 197 };
 198 NETGRAPH_INIT(ether, &ng_ether_typestruct);
 199
 200 /******************************************************************
 201                     ETHERNET FUNCTION HOOKS
 202 ******************************************************************/
 203
 204 /*
 205  * Handle a packet that has come in on an interface. We get to
 206  * look at it here before any upper layer protocols do.
 207  */
 208 static void
 209 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
 210 {
 211         const node_p node = IFP2NG(ifp);
 212         const priv_p priv = node->private;
 213
 214         /* If "lower" hook not connected, let packet continue */
 215         if (priv->lower == NULL || priv->lowerOrphan)
 216                 return;
 217         ng_ether_input2(node, mp, NULL);
 218 }
 219
 220 /*
 221  * Handle a packet that has come in on an interface, and which
 222  * does not match any of our known protocols (an ``orphan'').
 223  */
 224 static void
 225 ng_ether_input_orphan(struct ifnet *ifp,
 226         struct mbuf *m, const struct ether_header *eh)
 227 {
 228         const node_p node = IFP2NG(ifp);
 229         const priv_p priv = node->private;
 230
 231         /* If "orphan" hook not connected, let packet continue */
 232         if (priv->lower == NULL || !priv->lowerOrphan) {
 233                 m_freem(m);
 234                 return;
 235         }
 236         ng_ether_input2(node, &m, eh);
 237         if (m != NULL)
 238                 m_freem(m);
 239 }
 240
 241 /*
 242  * Handle a packet that has come in on an interface.
 243  * The Ethernet header has already been detached from the mbuf,
 244  * so we have to put it back.
 245  *
 246  * NOTE: this function will get called at splimp()
 247  */
 248 static void
 249 ng_ether_input2(node_p node, struct mbuf **mp, const struct ether_header *eh)
 250 {
 251         const priv_p priv = node->private;
 252         meta_p meta = NULL;
 253         int error;
 254
 255         /* Glue Ethernet header back on */
 256         if (eh != NULL && (error = ng_ether_glueback_header(mp, eh)) != 0)
 257                 return;
 258
 259         /* Send out lower/orphan hook */
 260         ng_queue_data(priv->lower, *mp, meta);
 261         *mp = NULL;
 262 }
 263
 264 /*
 265  * Handle a packet that is going out on an interface.
 266  * The Ethernet header is already attached to the mbuf.
 267  */
 268 static int
 269 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
 270 {
 271         const node_p node = IFP2NG(ifp);
 272         const priv_p priv = node->private;
 273         meta_p meta = NULL;
 274         int error = 0;
 275
 276         /* If "upper" hook not connected, let packet continue */
 277         if (priv->upper == NULL)
 278                 return (0);
 279
 280         /* Send it out "upper" hook */
 281         NG_SEND_DATA(error, priv->upper, *mp, meta);
 282         *mp = NULL;
 283         return (error);
 284 }
 285
 286 /*
 287  * A new Ethernet interface has been attached.
 288  * Create a new node for it, etc.
 289  */
 290 static void
 291 ng_ether_attach(struct ifnet *ifp)
 292 {
 293         char name[IFNAMSIZ + 1];
 294         priv_p priv;
 295         node_p node;
 296
 297         /* Create node */
 298         KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
 299         strlcpy(name, ifp->if_xname, sizeof(name));
 300         if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
 301                 log(LOG_ERR, "%s: can't %s for %s\n",
 302                     __func__, "create node", name);
 303                 return;
 304         }
 305
 306         /* Allocate private data */
 307         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
 308         if (priv == NULL) {
 309                 log(LOG_ERR, "%s: can't %s for %s\n",
 310                     __func__, "allocate memory", name);
 311                 ng_unref(node);
 312                 return;
 313         }
 314         node->private = priv;
 315         priv->ifp = ifp;
 316         IFP2NG(ifp) = node;
 317         priv->autoSrcAddr = 1;
 318         priv->hwassist = ifp->if_hwassist;
 319
 320         /* Try to give the node the same name as the interface */
 321         if (ng_name_node(node, name) != 0) {
 322                 log(LOG_WARNING, "%s: can't name node %s\n",
 323                     __func__, name);
 324         }
 325 }
 326
 327 /*
 328  * An Ethernet interface is being detached.
 329  * Destroy its node.
 330  */
 331 static void
 332 ng_ether_detach(struct ifnet *ifp)
 333 {
 334         const node_p node = IFP2NG(ifp);
 335         priv_p priv;
 336
 337         if (node == NULL)               /* no node (why not?), ignore */
 338                 return;
 339         ng_rmnode(node);                /* break all links to other nodes */
 340         node->flags |= NG_INVALID;
 341         ng_unname(node);                /* free name (and its reference) */
 342         IFP2NG(ifp) = NULL;             /* detach node from interface */
 343         priv = node->private;           /* free node private info */
 344         bzero(priv, sizeof(*priv));
 345         FREE(priv, M_NETGRAPH);
 346         node->private = NULL;
 347         ng_unref(node);                 /* free node itself */
 348 }
 349
 350 /*
 351  * Optimization for gluing the Ethernet header back onto
 352  * the front of an incoming packet.
 353  */
 354 static int
 355 ng_ether_glueback_header(struct mbuf **mp, const struct ether_header *eh)
 356 {
 357         struct mbuf *m = *mp;
 358         int error = 0;
 359
 360         /*
 361          * Optimize for the case where the header is already in place
 362          * at the front of the mbuf. This is actually quite likely
 363          * because many Ethernet drivers generate packets this way.
 364          */
 365         if (eh == mtod(m, struct ether_header *) - 1) {
 366                 m->m_len += sizeof(*eh);
 367                 m->m_data -= sizeof(*eh);
 368                 m->m_pkthdr.len += sizeof(*eh);
 369                 goto done;
 370         }
 371
 372         /* Prepend the header back onto the front of the mbuf */
 373         M_PREPEND(m, sizeof(*eh), MB_DONTWAIT);
 374         if (m == NULL) {
 375                 error = ENOBUFS;
 376                 goto done;
 377         }
 378
 379         /* Copy header into front of mbuf */
 380         bcopy(eh, mtod(m, void *), sizeof(*eh));
 381
 382 done:
 383         /* Done */
 384         *mp = m;
 385         return error;
 386 }
 387
 388 /******************************************************************
 389                     NETGRAPH NODE METHODS
 390 ******************************************************************/
 391
 392 /*
 393  * It is not possible or allowable to create a node of this type.
 394  * Nodes get created when the interface is attached (or, when
 395  * this node type's KLD is loaded).
 396  */
 397 static int
 398 ng_ether_constructor(node_p *nodep)
 399 {
 400         return (EINVAL);
 401 }
 402
 403 /*
 404  * Check for attaching a new hook.
 405  */
 406 static  int
 407 ng_ether_newhook(node_p node, hook_p hook, const char *name)
 408 {
 409         const priv_p priv = node->private;
 410         u_char orphan = priv->lowerOrphan;
 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         else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
 421                 hookptr = &priv->lower;
 422                 orphan = 0;
 423         } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
 424                 hookptr = &priv->lower;
 425                 orphan = 1;
 426         } else
 427                 return (EINVAL);
 428
 429         /* Check if already connected (shouldn't be, but doesn't hurt) */
 430         if (*hookptr != NULL)
 431                 return (EISCONN);
 432
 433         /* Disable hardware checksums while 'upper' hook is connected */
 434         if (hookptr == &priv->upper)
 435                 priv->ifp->if_hwassist = 0;
 436
 437         /* OK */
 438         *hookptr = hook;
 439         priv->lowerOrphan = orphan;
 440         return (0);
 441 }
 442
 443 /*
 444  * Receive an incoming control message.
 445  */
 446 static int
 447 ng_ether_rcvmsg(node_p node, struct ng_mesg *msg,
 448         const char *retaddr, struct ng_mesg **rptr)
 449 {
 450         const priv_p priv = node->private;
 451         struct ng_mesg *resp = NULL;
 452         int error = 0;
 453
 454         switch (msg->header.typecookie) {
 455         case NGM_ETHER_COOKIE:
 456                 switch (msg->header.cmd) {
 457                 case NGM_ETHER_GET_IFNAME:
 458                         NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
 459                         if (resp == NULL) {
 460                                 error = ENOMEM;
 461                                 break;
 462                         }
 463                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
 464                         break;
 465                 case NGM_ETHER_GET_IFINDEX:
 466                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
 467                         if (resp == NULL) {
 468                                 error = ENOMEM;
 469                                 break;
 470                         }
 471                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
 472                         break;
 473                 case NGM_ETHER_GET_ENADDR:
 474                         NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
 475                         if (resp == NULL) {
 476                                 error = ENOMEM;
 477                                 break;
 478                         }
 479                         bcopy((IFP2AC(priv->ifp))->ac_enaddr,
 480                             resp->data, ETHER_ADDR_LEN);
 481                         break;
 482                 case NGM_ETHER_SET_ENADDR:
 483                     {
 484                         if (msg->header.arglen != ETHER_ADDR_LEN) {
 485                                 error = EINVAL;
 486                                 break;
 487                         }
 488                         error = if_setlladdr(priv->ifp,
 489                             (u_char *)msg->data, ETHER_ADDR_LEN);
 490                         break;
 491                     }
 492                 case NGM_ETHER_GET_PROMISC:
 493                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
 494                         if (resp == NULL) {
 495                                 error = ENOMEM;
 496                                 break;
 497                         }
 498                         *((u_int32_t *)resp->data) = priv->promisc;
 499                         break;
 500                 case NGM_ETHER_SET_PROMISC:
 501                     {
 502                         u_char want;
 503
 504                         if (msg->header.arglen != sizeof(u_int32_t)) {
 505                                 error = EINVAL;
 506                                 break;
 507                         }
 508                         want = !!*((u_int32_t *)msg->data);
 509                         if (want ^ priv->promisc) {
 510                                 if ((error = ifpromisc(priv->ifp, want)) != 0)
 511                                         break;
 512                                 priv->promisc = want;
 513                         }
 514                         break;
 515                     }
 516                 case NGM_ETHER_GET_AUTOSRC:
 517                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
 518                         if (resp == NULL) {
 519                                 error = ENOMEM;
 520                                 break;
 521                         }
 522                         *((u_int32_t *)resp->data) = priv->autoSrcAddr;
 523                         break;
 524                 case NGM_ETHER_SET_AUTOSRC:
 525                         if (msg->header.arglen != sizeof(u_int32_t)) {
 526                                 error = EINVAL;
 527                                 break;
 528                         }
 529                         priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
 530                         break;
 531                 default:
 532                         error = EINVAL;
 533                         break;
 534                 }
 535                 break;
 536         default:
 537                 error = EINVAL;
 538                 break;
 539         }
 540         if (rptr)
 541                 *rptr = resp;
 542         else if (resp != NULL)
 543                 FREE(resp, M_NETGRAPH);
 544         FREE(msg, M_NETGRAPH);
 545         return (error);
 546 }
 547
 548 /*
 549  * Receive data on a hook.
 550  */
 551 static int
 552 ng_ether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
 553 {
 554         const node_p node = hook->node;
 555         const priv_p priv = node->private;
 556
 557         if (hook == priv->lower)
 558                 return ng_ether_rcv_lower(node, m, meta);
 559         if (hook == priv->upper)
 560                 return ng_ether_rcv_upper(node, m, meta);
 561         panic("%s: weird hook", __func__);
 562 }
 563
 564 /*
 565  * Handle an mbuf received on the "lower" hook.
 566  */
 567 static int
 568 ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
 569 {
 570         const priv_p priv = node->private;
 571         struct ifnet *const ifp = priv->ifp;
 572         int error;
 573
 574         /* Discard meta info */
 575         NG_FREE_META(meta);
 576
 577         /* Check whether interface is ready for packets */
 578         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
 579                 m_freem(m);
 580                 return (ENETDOWN);
 581         }
 582
 583         /* Make sure header is fully pulled up */
 584         if (m->m_pkthdr.len < sizeof(struct ether_header)) {
 585                 m_freem(m);
 586                 return (EINVAL);
 587         }
 588         if (m->m_len < sizeof(struct ether_header)
 589             && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
 590                 return (ENOBUFS);
 591
 592         /* Drop in the MAC address if desired */
 593         if (priv->autoSrcAddr) {
 594
 595                 /* Make the mbuf writable if it's not already */
 596                 if (!M_WRITABLE(m)
 597                     && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
 598                         return (ENOBUFS);
 599
 600                 /* Overwrite source MAC address */
 601                 bcopy((IFP2AC(ifp))->ac_enaddr,
 602                     mtod(m, struct ether_header *)->ether_shost,
 603                     ETHER_ADDR_LEN);
 604         }
 605
 606         /* Send it on its way */
 607         error = ether_output_frame(ifp, m);
 608         return (error);
 609 }
 610
 611 /*
 612  * Handle an mbuf received on the "upper" hook.
 613  */
 614 static int
 615 ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
 616 {
 617         const priv_p priv = node->private;
 618
 619         /* Discard meta info */
 620         NG_FREE_META(meta);
 621
 622         /* Check length and pull off header */
 623         if (m->m_pkthdr.len < ETHER_HDR_LEN) {
 624                 m_freem(m);
 625                 return (EINVAL);
 626         }
 627         if (m->m_len < ETHER_HDR_LEN &&
 628             (m = m_pullup(m, ETHER_HDR_LEN)) == NULL)
 629                 return (ENOBUFS);
 630
 631         m->m_pkthdr.rcvif = priv->ifp;
 632
 633         /*
 634          * XXX
 635          * Since frame processing is run in netisr0,
 636          * 'm' may _not_ even on its target CPU.
 637          */
 638         /* Route packet back in */
 639         ether_demux_oncpu(priv->ifp, m);
 640         return (0);
 641 }
 642
 643 /*
 644  * Shutdown node. This resets the node but does not remove it.
 645  */
 646 static int
 647 ng_ether_rmnode(node_p node)
 648 {
 649         const priv_p priv = node->private;
 650
 651         ng_cutlinks(node);
 652         node->flags &= ~NG_INVALID;     /* bounce back to life */
 653         if (priv->promisc) {            /* disable promiscuous mode */
 654                 ifpromisc(priv->ifp, 0);
 655                 priv->promisc = 0;
 656         }
 657         priv->autoSrcAddr = 1;          /* reset auto-src-addr flag */
 658         return (0);
 659 }
 660
 661 /*
 662  * Hook disconnection.
 663  */
 664 static int
 665 ng_ether_disconnect(hook_p hook)
 666 {
 667         const priv_p priv = hook->node->private;
 668
 669         if (hook == priv->upper) {
 670                 priv->upper = NULL;
 671                 priv->ifp->if_hwassist = priv->hwassist;  /* restore h/w csum */
 672         } else if (hook == priv->lower) {
 673                 priv->lower = NULL;
 674                 priv->lowerOrphan = 0;
 675         } else
 676                 panic("%s: weird hook", __func__);
 677         if (hook->node->numhooks == 0)
 678                 ng_rmnode(hook->node);  /* reset node */
 679         return (0);
 680 }
 681
 682 static int
 683 ng_enaddr_parse(const struct ng_parse_type *type,
 684         const char *s, int *const off, const u_char *const start,
 685         u_char *const buf, int *const buflen)
 686 {
 687         char *eptr;
 688         u_long val;
 689         int i;
 690
 691         if (*buflen < ETHER_ADDR_LEN)
 692                 return (ERANGE);
 693         for (i = 0; i < ETHER_ADDR_LEN; i++) {
 694                 val = strtoul(s + *off, &eptr, 16);
 695                 if (val > 0xff || eptr == s + *off)
 696                         return (EINVAL);
 697                 buf[i] = (u_char)val;
 698                 *off = (eptr - s);
 699                 if (i < ETHER_ADDR_LEN - 1) {
 700                         if (*eptr != ':')
 701                                 return (EINVAL);
 702                         (*off)++;
 703                 }
 704         }
 705         *buflen = ETHER_ADDR_LEN;
 706         return (0);
 707 }
 708
 709 static int
 710 ng_enaddr_unparse(const struct ng_parse_type *type,
 711         const u_char *data, int *off, char *cbuf, int cbuflen)
 712 {
 713         int len;
 714
 715         len = ksnprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
 716             data[*off], data[*off + 1], data[*off + 2],
 717             data[*off + 3], data[*off + 4], data[*off + 5]);
 718         if (len >= cbuflen)
 719                 return (ERANGE);
 720         *off += ETHER_ADDR_LEN;
 721         return (0);
 722 }
 723
 724 /******************************************************************
 725                         INITIALIZATION
 726 ******************************************************************/
 727
 728 /*
 729  * Handle loading and unloading for this node type.
 730  */
 731 static int
 732 ng_ether_mod_event(module_t mod, int event, void *data)
 733 {
 734         struct ifnet *ifp;
 735         int error = 0;
 736
 737         crit_enter();
 738         switch (event) {
 739         case MOD_LOAD:
 740
 741                 /* Register function hooks */
 742                 if (ng_ether_attach_p != NULL) {
 743                         error = EEXIST;
 744                         break;
 745                 }
 746                 ng_ether_attach_p = ng_ether_attach;
 747                 ng_ether_detach_p = ng_ether_detach;
 748                 ng_ether_output_p = ng_ether_output;
 749                 ng_ether_input_p = ng_ether_input;
 750                 ng_ether_input_orphan_p = ng_ether_input_orphan;
 751
 752                 /* Create nodes for any already-existing Ethernet interfaces */
 753                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
 754                         if (ifp->if_type == IFT_ETHER ||
 755                             ifp->if_type == IFT_L2VLAN)
 756                                 ng_ether_attach(ifp);
 757                 }
 758                 break;
 759
 760         case MOD_UNLOAD:
 761
 762                 /*
 763                  * Note that the base code won't try to unload us until
 764                  * all nodes have been removed, and that can't happen
 765                  * until all Ethernet interfaces are removed. In any
 766                  * case, we know there are no nodes left if the action
 767                  * is MOD_UNLOAD, so there's no need to detach any nodes.
 768                  */
 769
 770                 /* Unregister function hooks */
 771                 ng_ether_attach_p = NULL;
 772                 ng_ether_detach_p = NULL;
 773                 ng_ether_output_p = NULL;
 774                 ng_ether_input_p = NULL;
 775                 ng_ether_input_orphan_p = NULL;
 776                 break;
 777
 778         default:
 779                 error = EOPNOTSUPP;
 780                 break;
 781         }
 782         crit_exit();
 783         return (error);
 784 }
 785