The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
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/8.1/sys/netgraph/ng_ether.c 208526 2010-05-25 02:36:06Z thompsa $
   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 
   59 #include <net/if.h>
   60 #include <net/if_dl.h>
   61 #include <net/if_types.h>
   62 #include <net/if_arp.h>
   63 #include <net/if_var.h>
   64 #include <net/ethernet.h>
   65 #include <net/if_bridgevar.h>
   66 #include <net/vnet.h>
   67 
   68 #include <netgraph/ng_message.h>
   69 #include <netgraph/netgraph.h>
   70 #include <netgraph/ng_parse.h>
   71 #include <netgraph/ng_ether.h>
   72 
   73 #define IFP2NG(ifp)  (IFP2AC((ifp))->ac_netgraph)
   74 
   75 /* Per-node private data */
   76 struct private {
   77         struct ifnet    *ifp;           /* associated interface */
   78         hook_p          upper;          /* upper hook connection */
   79         hook_p          lower;          /* lower hook connection */
   80         hook_p          orphan;         /* orphan hook connection */
   81         u_char          autoSrcAddr;    /* always overwrite source address */
   82         u_char          promisc;        /* promiscuous mode enabled */
   83         u_long          hwassist;       /* hardware checksum capabilities */
   84         u_int           flags;          /* flags e.g. really die */
   85 };
   86 typedef struct private *priv_p;
   87 
   88 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
   89 extern  void    (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
   90 extern  void    (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
   91 extern  int     (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
   92 extern  void    (*ng_ether_attach_p)(struct ifnet *ifp);
   93 extern  void    (*ng_ether_detach_p)(struct ifnet *ifp);
   94 extern  void    (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
   95 
   96 /* Functional hooks called from if_ethersubr.c */
   97 static void     ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
   98 static void     ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
   99 static int      ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
  100 static void     ng_ether_attach(struct ifnet *ifp);
  101 static void     ng_ether_detach(struct ifnet *ifp); 
  102 static void     ng_ether_link_state(struct ifnet *ifp, int state); 
  103 
  104 /* Other functions */
  105 static int      ng_ether_rcv_lower(hook_p node, item_p item);
  106 static int      ng_ether_rcv_upper(hook_p node, item_p item);
  107 
  108 /* Netgraph node methods */
  109 static ng_constructor_t ng_ether_constructor;
  110 static ng_rcvmsg_t      ng_ether_rcvmsg;
  111 static ng_shutdown_t    ng_ether_shutdown;
  112 static ng_newhook_t     ng_ether_newhook;
  113 static ng_rcvdata_t     ng_ether_rcvdata;
  114 static ng_disconnect_t  ng_ether_disconnect;
  115 static int              ng_ether_mod_event(module_t mod, int event, void *data);
  116 
  117 /* List of commands and how to convert arguments to/from ASCII */
  118 static const struct ng_cmdlist ng_ether_cmdlist[] = {
  119         {
  120           NGM_ETHER_COOKIE,
  121           NGM_ETHER_GET_IFNAME,
  122           "getifname",
  123           NULL,
  124           &ng_parse_string_type
  125         },
  126         {
  127           NGM_ETHER_COOKIE,
  128           NGM_ETHER_GET_IFINDEX,
  129           "getifindex",
  130           NULL,
  131           &ng_parse_int32_type
  132         },
  133         {
  134           NGM_ETHER_COOKIE,
  135           NGM_ETHER_GET_ENADDR,
  136           "getenaddr",
  137           NULL,
  138           &ng_parse_enaddr_type
  139         },
  140         {
  141           NGM_ETHER_COOKIE,
  142           NGM_ETHER_SET_ENADDR,
  143           "setenaddr",
  144           &ng_parse_enaddr_type,
  145           NULL
  146         },
  147         {
  148           NGM_ETHER_COOKIE,
  149           NGM_ETHER_GET_PROMISC,
  150           "getpromisc",
  151           NULL,
  152           &ng_parse_int32_type
  153         },
  154         {
  155           NGM_ETHER_COOKIE,
  156           NGM_ETHER_SET_PROMISC,
  157           "setpromisc",
  158           &ng_parse_int32_type,
  159           NULL
  160         },
  161         {
  162           NGM_ETHER_COOKIE,
  163           NGM_ETHER_GET_AUTOSRC,
  164           "getautosrc",
  165           NULL,
  166           &ng_parse_int32_type
  167         },
  168         {
  169           NGM_ETHER_COOKIE,
  170           NGM_ETHER_SET_AUTOSRC,
  171           "setautosrc",
  172           &ng_parse_int32_type,
  173           NULL
  174         },
  175         {
  176           NGM_ETHER_COOKIE,
  177           NGM_ETHER_ADD_MULTI,
  178           "addmulti",
  179           &ng_parse_enaddr_type,
  180           NULL
  181         },
  182         {
  183           NGM_ETHER_COOKIE,
  184           NGM_ETHER_DEL_MULTI,
  185           "delmulti",
  186           &ng_parse_enaddr_type,
  187           NULL
  188         },
  189         {
  190           NGM_ETHER_COOKIE,
  191           NGM_ETHER_DETACH,
  192           "detach",
  193           NULL,
  194           NULL
  195         },
  196         { 0 }
  197 };
  198 
  199 static struct ng_type ng_ether_typestruct = {
  200         .version =      NG_ABI_VERSION,
  201         .name =         NG_ETHER_NODE_TYPE,
  202         .mod_event =    ng_ether_mod_event,
  203         .constructor =  ng_ether_constructor,
  204         .rcvmsg =       ng_ether_rcvmsg,
  205         .shutdown =     ng_ether_shutdown,
  206         .newhook =      ng_ether_newhook,
  207         .rcvdata =      ng_ether_rcvdata,
  208         .disconnect =   ng_ether_disconnect,
  209         .cmdlist =      ng_ether_cmdlist,
  210 };
  211 NETGRAPH_INIT(ether, &ng_ether_typestruct);
  212 
  213 /******************************************************************
  214                     ETHERNET FUNCTION HOOKS
  215 ******************************************************************/
  216 
  217 /*
  218  * Handle a packet that has come in on an interface. We get to
  219  * look at it here before any upper layer protocols do.
  220  *
  221  * NOTE: this function will get called at splimp()
  222  */
  223 static void
  224 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
  225 {
  226         const node_p node = IFP2NG(ifp);
  227         const priv_p priv = NG_NODE_PRIVATE(node);
  228         int error;
  229 
  230         /* If "lower" hook not connected, let packet continue */
  231         if (priv->lower == NULL)
  232                 return;
  233         NG_SEND_DATA_ONLY(error, priv->lower, *mp);     /* sets *mp = NULL */
  234 }
  235 
  236 /*
  237  * Handle a packet that has come in on an interface, and which
  238  * does not match any of our known protocols (an ``orphan'').
  239  *
  240  * NOTE: this function will get called at splimp()
  241  */
  242 static void
  243 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
  244 {
  245         const node_p node = IFP2NG(ifp);
  246         const priv_p priv = NG_NODE_PRIVATE(node);
  247         int error;
  248 
  249         /* If "orphan" hook not connected, discard packet */
  250         if (priv->orphan == NULL) {
  251                 m_freem(m);
  252                 return;
  253         }
  254         NG_SEND_DATA_ONLY(error, priv->orphan, m);
  255 }
  256 
  257 /*
  258  * Handle a packet that is going out on an interface.
  259  * The Ethernet header is already attached to the mbuf.
  260  */
  261 static int
  262 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
  263 {
  264         const node_p node = IFP2NG(ifp);
  265         const priv_p priv = NG_NODE_PRIVATE(node);
  266         int error = 0;
  267 
  268         /* If "upper" hook not connected, let packet continue */
  269         if (priv->upper == NULL)
  270                 return (0);
  271 
  272         /* Send it out "upper" hook */
  273         NG_OUTBOUND_THREAD_REF();
  274         NG_SEND_DATA_ONLY(error, priv->upper, *mp);
  275         NG_OUTBOUND_THREAD_UNREF();
  276         return (error);
  277 }
  278 
  279 /*
  280  * A new Ethernet interface has been attached.
  281  * Create a new node for it, etc.
  282  */
  283 static void
  284 ng_ether_attach(struct ifnet *ifp)
  285 {
  286         priv_p priv;
  287         node_p node;
  288 
  289         /*
  290          * Do not create / attach an ether node to this ifnet if
  291          * a netgraph node with the same name already exists.
  292          * This should prevent ether nodes to become attached to
  293          * eiface nodes, which may be problematic due to naming
  294          * clashes.
  295          */
  296         if ((node = ng_name2noderef(NULL, ifp->if_xname)) != NULL) {
  297                 NG_NODE_UNREF(node);
  298                 return;
  299         }
  300 
  301         /* Create node */
  302         KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
  303         if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
  304                 log(LOG_ERR, "%s: can't %s for %s\n",
  305                     __func__, "create node", ifp->if_xname);
  306                 return;
  307         }
  308 
  309         /* Allocate private data */
  310         priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  311         if (priv == NULL) {
  312                 log(LOG_ERR, "%s: can't %s for %s\n",
  313                     __func__, "allocate memory", ifp->if_xname);
  314                 NG_NODE_UNREF(node);
  315                 return;
  316         }
  317         NG_NODE_SET_PRIVATE(node, priv);
  318         priv->ifp = ifp;
  319         IFP2NG(ifp) = node;
  320         priv->hwassist = ifp->if_hwassist;
  321 
  322         /* Try to give the node the same name as the interface */
  323         if (ng_name_node(node, ifp->if_xname) != 0) {
  324                 log(LOG_WARNING, "%s: can't name node %s\n",
  325                     __func__, ifp->if_xname);
  326         }
  327 }
  328 
  329 /*
  330  * An Ethernet interface is being detached.
  331  * REALLY Destroy its node.
  332  */
  333 static void
  334 ng_ether_detach(struct ifnet *ifp)
  335 {
  336         const node_p node = IFP2NG(ifp);
  337         const priv_p priv = NG_NODE_PRIVATE(node);
  338 
  339         NG_NODE_REALLY_DIE(node);       /* Force real removal of node */
  340         /*
  341          * We can't assume the ifnet is still around when we run shutdown
  342          * So zap it now. XXX We HOPE that anything running at this time
  343          * handles it (as it should in the non netgraph case).
  344          */
  345         IFP2NG(ifp) = NULL;
  346         priv->ifp = NULL;       /* XXX race if interrupted an output packet */
  347         ng_rmnode_self(node);           /* remove all netgraph parts */
  348 }
  349 
  350 /*
  351  * Notify graph about link event.
  352  * if_link_state_change() has already checked that the state has changed.
  353  */
  354 static void
  355 ng_ether_link_state(struct ifnet *ifp, int state)
  356 {
  357         const node_p node = IFP2NG(ifp);
  358         const priv_p priv = NG_NODE_PRIVATE(node);
  359         struct ng_mesg *msg;
  360         int cmd, dummy_error = 0;
  361 
  362         if (state == LINK_STATE_UP)
  363                 cmd = NGM_LINK_IS_UP;
  364         else if (state == LINK_STATE_DOWN)
  365                 cmd = NGM_LINK_IS_DOWN;
  366         else
  367                 return;
  368 
  369         if (priv->lower != NULL) {
  370                 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
  371                 if (msg != NULL)
  372                         NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
  373         }
  374         if (priv->orphan != NULL) {
  375                 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
  376                 if (msg != NULL)
  377                         NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0);
  378         }
  379 }
  380 
  381 /******************************************************************
  382                     NETGRAPH NODE METHODS
  383 ******************************************************************/
  384 
  385 /*
  386  * It is not possible or allowable to create a node of this type.
  387  * Nodes get created when the interface is attached (or, when
  388  * this node type's KLD is loaded).
  389  */
  390 static int
  391 ng_ether_constructor(node_p node)
  392 {
  393         return (EINVAL);
  394 }
  395 
  396 /*
  397  * Check for attaching a new hook.
  398  */
  399 static  int
  400 ng_ether_newhook(node_p node, hook_p hook, const char *name)
  401 {
  402         const priv_p priv = NG_NODE_PRIVATE(node);
  403         hook_p *hookptr;
  404 
  405         /* Divert hook is an alias for lower */
  406         if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
  407                 name = NG_ETHER_HOOK_LOWER;
  408 
  409         /* Which hook? */
  410         if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) {
  411                 hookptr = &priv->upper;
  412                 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper);
  413                 NG_HOOK_SET_TO_INBOUND(hook);
  414         } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
  415                 hookptr = &priv->lower;
  416                 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
  417         } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
  418                 hookptr = &priv->orphan;
  419                 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
  420         } else
  421                 return (EINVAL);
  422 
  423         /* Check if already connected (shouldn't be, but doesn't hurt) */
  424         if (*hookptr != NULL)
  425                 return (EISCONN);
  426 
  427         /* Disable hardware checksums while 'upper' hook is connected */
  428         if (hookptr == &priv->upper)
  429                 priv->ifp->if_hwassist = 0;
  430         NG_HOOK_HI_STACK(hook);
  431         /* OK */
  432         *hookptr = hook;
  433         return (0);
  434 }
  435 
  436 /*
  437  * Receive an incoming control message.
  438  */
  439 static int
  440 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
  441 {
  442         const priv_p priv = NG_NODE_PRIVATE(node);
  443         struct ng_mesg *resp = NULL;
  444         int error = 0;
  445         struct ng_mesg *msg;
  446 
  447         NGI_GET_MSG(item, msg);
  448         switch (msg->header.typecookie) {
  449         case NGM_ETHER_COOKIE:
  450                 switch (msg->header.cmd) {
  451                 case NGM_ETHER_GET_IFNAME:
  452                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  453                         if (resp == NULL) {
  454                                 error = ENOMEM;
  455                                 break;
  456                         }
  457                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
  458                         break;
  459                 case NGM_ETHER_GET_IFINDEX:
  460                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  461                         if (resp == NULL) {
  462                                 error = ENOMEM;
  463                                 break;
  464                         }
  465                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
  466                         break;
  467                 case NGM_ETHER_GET_ENADDR:
  468                         NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
  469                         if (resp == NULL) {
  470                                 error = ENOMEM;
  471                                 break;
  472                         }
  473                         bcopy(IF_LLADDR(priv->ifp),
  474                             resp->data, ETHER_ADDR_LEN);
  475                         break;
  476                 case NGM_ETHER_SET_ENADDR:
  477                     {
  478                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  479                                 error = EINVAL;
  480                                 break;
  481                         }
  482                         error = if_setlladdr(priv->ifp,
  483                             (u_char *)msg->data, ETHER_ADDR_LEN);
  484                         EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp);
  485                         break;
  486                     }
  487                 case NGM_ETHER_GET_PROMISC:
  488                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  489                         if (resp == NULL) {
  490                                 error = ENOMEM;
  491                                 break;
  492                         }
  493                         *((u_int32_t *)resp->data) = priv->promisc;
  494                         break;
  495                 case NGM_ETHER_SET_PROMISC:
  496                     {
  497                         u_char want;
  498 
  499                         if (msg->header.arglen != sizeof(u_int32_t)) {
  500                                 error = EINVAL;
  501                                 break;
  502                         }
  503                         want = !!*((u_int32_t *)msg->data);
  504                         if (want ^ priv->promisc) {
  505                                 if ((error = ifpromisc(priv->ifp, want)) != 0)
  506                                         break;
  507                                 priv->promisc = want;
  508                         }
  509                         break;
  510                     }
  511                 case NGM_ETHER_GET_AUTOSRC:
  512                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  513                         if (resp == NULL) {
  514                                 error = ENOMEM;
  515                                 break;
  516                         }
  517                         *((u_int32_t *)resp->data) = priv->autoSrcAddr;
  518                         break;
  519                 case NGM_ETHER_SET_AUTOSRC:
  520                         if (msg->header.arglen != sizeof(u_int32_t)) {
  521                                 error = EINVAL;
  522                                 break;
  523                         }
  524                         priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
  525                         break;
  526                 case NGM_ETHER_ADD_MULTI:
  527                     {
  528                         struct sockaddr_dl sa_dl;
  529                         struct ifmultiaddr *ifma;
  530 
  531                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  532                                 error = EINVAL;
  533                                 break;
  534                         }
  535                         bzero(&sa_dl, sizeof(struct sockaddr_dl));
  536                         sa_dl.sdl_len = sizeof(struct sockaddr_dl);
  537                         sa_dl.sdl_family = AF_LINK;
  538                         sa_dl.sdl_alen = ETHER_ADDR_LEN;
  539                         bcopy((void *)msg->data, LLADDR(&sa_dl),
  540                             ETHER_ADDR_LEN);
  541                         /*
  542                          * Netgraph is only permitted to join groups once
  543                          * via the if_addmulti() KPI, because it cannot hold
  544                          * struct ifmultiaddr * between calls. It may also
  545                          * lose a race while we check if the membership
  546                          * already exists.
  547                          */
  548                         if_maddr_rlock(priv->ifp);
  549                         ifma = if_findmulti(priv->ifp,
  550                             (struct sockaddr *)&sa_dl);
  551                         if_maddr_runlock(priv->ifp);
  552                         if (ifma != NULL) {
  553                                 error = EADDRINUSE;
  554                         } else {
  555                                 error = if_addmulti(priv->ifp,
  556                                     (struct sockaddr *)&sa_dl, &ifma);
  557                         }
  558                         break;
  559                     }
  560                 case NGM_ETHER_DEL_MULTI:
  561                     {
  562                         struct sockaddr_dl sa_dl;
  563 
  564                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  565                                 error = EINVAL;
  566                                 break;
  567                         }
  568                         bzero(&sa_dl, sizeof(struct sockaddr_dl));
  569                         sa_dl.sdl_len = sizeof(struct sockaddr_dl);
  570                         sa_dl.sdl_family = AF_LINK;
  571                         sa_dl.sdl_alen = ETHER_ADDR_LEN;
  572                         bcopy((void *)msg->data, LLADDR(&sa_dl),
  573                             ETHER_ADDR_LEN);
  574                         error = if_delmulti(priv->ifp,
  575                             (struct sockaddr *)&sa_dl);
  576                         break;
  577                     }
  578                 case NGM_ETHER_DETACH:
  579                         ng_ether_detach(priv->ifp);
  580                         break;
  581                 default:
  582                         error = EINVAL;
  583                         break;
  584                 }
  585                 break;
  586         default:
  587                 error = EINVAL;
  588                 break;
  589         }
  590         NG_RESPOND_MSG(error, node, item, resp);
  591         NG_FREE_MSG(msg);
  592         return (error);
  593 }
  594 
  595 /*
  596  * Receive data on a hook.
  597  * Since we use per-hook recveive methods this should never be called.
  598  */
  599 static int
  600 ng_ether_rcvdata(hook_p hook, item_p item)
  601 {
  602         NG_FREE_ITEM(item);
  603 
  604         panic("%s: weird hook", __func__);
  605 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */
  606         return (0);
  607 #endif
  608 }
  609 
  610 /*
  611  * Handle an mbuf received on the "lower" or "orphan" hook.
  612  */
  613 static int
  614 ng_ether_rcv_lower(hook_p hook, item_p item)
  615 {
  616         struct mbuf *m;
  617         const node_p node = NG_HOOK_NODE(hook);
  618         const priv_p priv = NG_NODE_PRIVATE(node);
  619         struct ifnet *const ifp = priv->ifp;
  620 
  621         NGI_GET_M(item, m);
  622         NG_FREE_ITEM(item);
  623 
  624         /* Check whether interface is ready for packets */
  625 
  626         if (!((ifp->if_flags & IFF_UP) &&
  627             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  628                 NG_FREE_M(m);
  629                 return (ENETDOWN);
  630         }
  631 
  632         /* Make sure header is fully pulled up */
  633         if (m->m_pkthdr.len < sizeof(struct ether_header)) {
  634                 NG_FREE_M(m);
  635                 return (EINVAL);
  636         }
  637         if (m->m_len < sizeof(struct ether_header)
  638             && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
  639                 return (ENOBUFS);
  640 
  641         /* Drop in the MAC address if desired */
  642         if (priv->autoSrcAddr) {
  643 
  644                 /* Make the mbuf writable if it's not already */
  645                 if (!M_WRITABLE(m)
  646                     && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
  647                         return (ENOBUFS);
  648 
  649                 /* Overwrite source MAC address */
  650                 bcopy(IF_LLADDR(ifp),
  651                     mtod(m, struct ether_header *)->ether_shost,
  652                     ETHER_ADDR_LEN);
  653         }
  654 
  655         /* Send it on its way */
  656         return ether_output_frame(ifp, m);
  657 }
  658 
  659 /*
  660  * Handle an mbuf received on the "upper" hook.
  661  */
  662 static int
  663 ng_ether_rcv_upper(hook_p hook, item_p item)
  664 {
  665         struct mbuf *m;
  666         const node_p node = NG_HOOK_NODE(hook);
  667         const priv_p priv = NG_NODE_PRIVATE(node);
  668         struct ifnet *ifp = priv->ifp;
  669 
  670         NGI_GET_M(item, m);
  671         NG_FREE_ITEM(item);
  672 
  673         /* Check length and pull off header */
  674         if (m->m_pkthdr.len < sizeof(struct ether_header)) {
  675                 NG_FREE_M(m);
  676                 return (EINVAL);
  677         }
  678         if (m->m_len < sizeof(struct ether_header) &&
  679             (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
  680                 return (ENOBUFS);
  681 
  682         m->m_pkthdr.rcvif = ifp;
  683 
  684         /* Pass the packet to the bridge, it may come back to us */
  685         if (ifp->if_bridge) {
  686                 BRIDGE_INPUT(ifp, m);
  687                 if (m == NULL)
  688                         return (0);
  689         }
  690 
  691         /* Route packet back in */
  692         ether_demux(ifp, m);
  693         return (0);
  694 }
  695 
  696 /*
  697  * Shutdown node. This resets the node but does not remove it
  698  * unless the REALLY_DIE flag is set.
  699  */
  700 static int
  701 ng_ether_shutdown(node_p node)
  702 {
  703         const priv_p priv = NG_NODE_PRIVATE(node);
  704 
  705         if (node->nd_flags & NGF_REALLY_DIE) {
  706                 /*
  707                  * WE came here because the ethernet card is being unloaded,
  708                  * so stop being persistant.
  709                  * Actually undo all the things we did on creation.
  710                  * Assume the ifp has already been freed.
  711                  */
  712                 NG_NODE_SET_PRIVATE(node, NULL);
  713                 free(priv, M_NETGRAPH);         
  714                 NG_NODE_UNREF(node);    /* free node itself */
  715                 return (0);
  716         }
  717         if (priv->promisc) {            /* disable promiscuous mode */
  718                 (void)ifpromisc(priv->ifp, 0);
  719                 priv->promisc = 0;
  720         }
  721         priv->autoSrcAddr = 1;          /* reset auto-src-addr flag */
  722         NG_NODE_REVIVE(node);           /* Signal ng_rmnode we are persisant */
  723 
  724         return (0);
  725 }
  726 
  727 /*
  728  * Hook disconnection.
  729  */
  730 static int
  731 ng_ether_disconnect(hook_p hook)
  732 {
  733         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  734 
  735         if (hook == priv->upper) {
  736                 priv->upper = NULL;
  737                 if (priv->ifp != NULL)          /* restore h/w csum */
  738                         priv->ifp->if_hwassist = priv->hwassist;
  739         } else if (hook == priv->lower)
  740                 priv->lower = NULL;
  741         else if (hook == priv->orphan)
  742                 priv->orphan = NULL;
  743         else
  744                 panic("%s: weird hook", __func__);
  745         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  746         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  747                 ng_rmnode_self(NG_HOOK_NODE(hook));     /* reset node */
  748         return (0);
  749 }
  750 
  751 /******************************************************************
  752                         INITIALIZATION
  753 ******************************************************************/
  754 
  755 /*
  756  * Handle loading and unloading for this node type.
  757  */
  758 static int
  759 ng_ether_mod_event(module_t mod, int event, void *data)
  760 {
  761         int error = 0;
  762         int s;
  763 
  764         s = splnet();
  765         switch (event) {
  766         case MOD_LOAD:
  767 
  768                 /* Register function hooks */
  769                 if (ng_ether_attach_p != NULL) {
  770                         error = EEXIST;
  771                         break;
  772                 }
  773                 ng_ether_attach_p = ng_ether_attach;
  774                 ng_ether_detach_p = ng_ether_detach;
  775                 ng_ether_output_p = ng_ether_output;
  776                 ng_ether_input_p = ng_ether_input;
  777                 ng_ether_input_orphan_p = ng_ether_input_orphan;
  778                 ng_ether_link_state_p = ng_ether_link_state;
  779 
  780                 break;
  781 
  782         case MOD_UNLOAD:
  783 
  784                 /*
  785                  * Note that the base code won't try to unload us until
  786                  * all nodes have been removed, and that can't happen
  787                  * until all Ethernet interfaces are removed. In any
  788                  * case, we know there are no nodes left if the action
  789                  * is MOD_UNLOAD, so there's no need to detach any nodes.
  790                  */
  791 
  792                 /* Unregister function hooks */
  793                 ng_ether_attach_p = NULL;
  794                 ng_ether_detach_p = NULL;
  795                 ng_ether_output_p = NULL;
  796                 ng_ether_input_p = NULL;
  797                 ng_ether_input_orphan_p = NULL;
  798                 ng_ether_link_state_p = NULL;
  799                 break;
  800 
  801         default:
  802                 error = EOPNOTSUPP;
  803                 break;
  804         }
  805         splx(s);
  806         return (error);
  807 }
  808 
  809 static void
  810 vnet_ng_ether_init(const void *unused)
  811 {
  812         struct ifnet *ifp;
  813 
  814         /* If module load was rejected, don't attach to vnets. */
  815         if (ng_ether_attach_p != ng_ether_attach)
  816                 return;
  817 
  818         /* Create nodes for any already-existing Ethernet interfaces. */
  819         IFNET_RLOCK();
  820         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
  821                 if (ifp->if_type == IFT_ETHER
  822                     || ifp->if_type == IFT_L2VLAN)
  823                         ng_ether_attach(ifp);
  824         }
  825         IFNET_RUNLOCK();
  826 }
  827 VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  828     vnet_ng_ether_init, NULL);

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