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: stable/9/sys/netgraph/ng_ether.c 247886 2013-03-06 11:02:44Z avg $
   43  */
   44 
   45 /*
   46  * ng_ether(4) netgraph node type
   47  */
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/kernel.h>
   52 #include <sys/malloc.h>
   53 #include <sys/mbuf.h>
   54 #include <sys/errno.h>
   55 #include <sys/proc.h>
   56 #include <sys/syslog.h>
   57 #include <sys/socket.h>
   58 #include <sys/taskqueue.h>
   59 
   60 #include <net/if.h>
   61 #include <net/if_dl.h>
   62 #include <net/if_types.h>
   63 #include <net/if_arp.h>
   64 #include <net/if_var.h>
   65 #include <net/ethernet.h>
   66 #include <net/if_bridgevar.h>
   67 #include <net/vnet.h>
   68 
   69 #include <netgraph/ng_message.h>
   70 #include <netgraph/netgraph.h>
   71 #include <netgraph/ng_parse.h>
   72 #include <netgraph/ng_ether.h>
   73 
   74 MODULE_VERSION(ng_ether, 1);
   75 
   76 #define IFP2NG(ifp)  (IFP2AC((ifp))->ac_netgraph)
   77 
   78 /* Per-node private data */
   79 struct private {
   80         struct ifnet    *ifp;           /* associated interface */
   81         hook_p          upper;          /* upper hook connection */
   82         hook_p          lower;          /* lower hook connection */
   83         hook_p          orphan;         /* orphan hook connection */
   84         u_char          autoSrcAddr;    /* always overwrite source address */
   85         u_char          promisc;        /* promiscuous mode enabled */
   86         u_long          hwassist;       /* hardware checksum capabilities */
   87         u_int           flags;          /* flags e.g. really die */
   88 };
   89 typedef struct private *priv_p;
   90 
   91 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
   92 extern  void    (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
   93 extern  void    (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
   94 extern  int     (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
   95 extern  void    (*ng_ether_attach_p)(struct ifnet *ifp);
   96 extern  void    (*ng_ether_detach_p)(struct ifnet *ifp);
   97 extern  void    (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
   98 
   99 /* Functional hooks called from if_ethersubr.c */
  100 static void     ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
  101 static void     ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
  102 static int      ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
  103 static void     ng_ether_attach(struct ifnet *ifp);
  104 static void     ng_ether_detach(struct ifnet *ifp); 
  105 static void     ng_ether_link_state(struct ifnet *ifp, int state); 
  106 
  107 /* Other functions */
  108 static int      ng_ether_rcv_lower(hook_p node, item_p item);
  109 static int      ng_ether_rcv_upper(hook_p node, item_p item);
  110 
  111 /* Netgraph node methods */
  112 static ng_constructor_t ng_ether_constructor;
  113 static ng_rcvmsg_t      ng_ether_rcvmsg;
  114 static ng_shutdown_t    ng_ether_shutdown;
  115 static ng_newhook_t     ng_ether_newhook;
  116 static ng_rcvdata_t     ng_ether_rcvdata;
  117 static ng_disconnect_t  ng_ether_disconnect;
  118 static int              ng_ether_mod_event(module_t mod, int event, void *data);
  119 
  120 static eventhandler_tag ng_ether_ifnet_arrival_cookie;
  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_parse_enaddr_type
  144         },
  145         {
  146           NGM_ETHER_COOKIE,
  147           NGM_ETHER_SET_ENADDR,
  148           "setenaddr",
  149           &ng_parse_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         {
  181           NGM_ETHER_COOKIE,
  182           NGM_ETHER_ADD_MULTI,
  183           "addmulti",
  184           &ng_parse_enaddr_type,
  185           NULL
  186         },
  187         {
  188           NGM_ETHER_COOKIE,
  189           NGM_ETHER_DEL_MULTI,
  190           "delmulti",
  191           &ng_parse_enaddr_type,
  192           NULL
  193         },
  194         {
  195           NGM_ETHER_COOKIE,
  196           NGM_ETHER_DETACH,
  197           "detach",
  198           NULL,
  199           NULL
  200         },
  201         { 0 }
  202 };
  203 
  204 static struct ng_type ng_ether_typestruct = {
  205         .version =      NG_ABI_VERSION,
  206         .name =         NG_ETHER_NODE_TYPE,
  207         .mod_event =    ng_ether_mod_event,
  208         .constructor =  ng_ether_constructor,
  209         .rcvmsg =       ng_ether_rcvmsg,
  210         .shutdown =     ng_ether_shutdown,
  211         .newhook =      ng_ether_newhook,
  212         .rcvdata =      ng_ether_rcvdata,
  213         .disconnect =   ng_ether_disconnect,
  214         .cmdlist =      ng_ether_cmdlist,
  215 };
  216 NETGRAPH_INIT(ether, &ng_ether_typestruct);
  217 
  218 /******************************************************************
  219                     UTILITY FUNCTIONS
  220 ******************************************************************/
  221 static void
  222 ng_ether_sanitize_ifname(const char *ifname, char *name)
  223 {
  224         int i;
  225 
  226         for (i = 0; i < IFNAMSIZ; i++) {
  227                 if (ifname[i] == '.' || ifname[i] == ':')
  228                         name[i] = '_';
  229                 else
  230                         name[i] = ifname[i];
  231                 if (name[i] == '\0')
  232                         break;
  233         }
  234 }
  235 
  236 /******************************************************************
  237                     ETHERNET FUNCTION HOOKS
  238 ******************************************************************/
  239 
  240 /*
  241  * Handle a packet that has come in on an interface. We get to
  242  * look at it here before any upper layer protocols do.
  243  *
  244  * NOTE: this function will get called at splimp()
  245  */
  246 static void
  247 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
  248 {
  249         const node_p node = IFP2NG(ifp);
  250         const priv_p priv = NG_NODE_PRIVATE(node);
  251         int error;
  252 
  253         /* If "lower" hook not connected, let packet continue */
  254         if (priv->lower == NULL)
  255                 return;
  256         NG_SEND_DATA_ONLY(error, priv->lower, *mp);     /* sets *mp = NULL */
  257 }
  258 
  259 /*
  260  * Handle a packet that has come in on an interface, and which
  261  * does not match any of our known protocols (an ``orphan'').
  262  *
  263  * NOTE: this function will get called at splimp()
  264  */
  265 static void
  266 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
  267 {
  268         const node_p node = IFP2NG(ifp);
  269         const priv_p priv = NG_NODE_PRIVATE(node);
  270         int error;
  271 
  272         /* If "orphan" hook not connected, discard packet */
  273         if (priv->orphan == NULL) {
  274                 m_freem(m);
  275                 return;
  276         }
  277         NG_SEND_DATA_ONLY(error, priv->orphan, m);
  278 }
  279 
  280 /*
  281  * Handle a packet that is going out on an interface.
  282  * The Ethernet header is already attached to the mbuf.
  283  */
  284 static int
  285 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
  286 {
  287         const node_p node = IFP2NG(ifp);
  288         const priv_p priv = NG_NODE_PRIVATE(node);
  289         int error = 0;
  290 
  291         /* If "upper" hook not connected, let packet continue */
  292         if (priv->upper == NULL)
  293                 return (0);
  294 
  295         /* Send it out "upper" hook */
  296         NG_OUTBOUND_THREAD_REF();
  297         NG_SEND_DATA_ONLY(error, priv->upper, *mp);
  298         NG_OUTBOUND_THREAD_UNREF();
  299         return (error);
  300 }
  301 
  302 /*
  303  * A new Ethernet interface has been attached.
  304  * Create a new node for it, etc.
  305  */
  306 static void
  307 ng_ether_attach(struct ifnet *ifp)
  308 {
  309         char name[IFNAMSIZ];
  310         priv_p priv;
  311         node_p node;
  312 
  313         /*
  314          * Do not create / attach an ether node to this ifnet if
  315          * a netgraph node with the same name already exists.
  316          * This should prevent ether nodes to become attached to
  317          * eiface nodes, which may be problematic due to naming
  318          * clashes.
  319          */
  320         if ((node = ng_name2noderef(NULL, ifp->if_xname)) != NULL) {
  321                 NG_NODE_UNREF(node);
  322                 return;
  323         }
  324 
  325         /* Create node */
  326         KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
  327         if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
  328                 log(LOG_ERR, "%s: can't %s for %s\n",
  329                     __func__, "create node", ifp->if_xname);
  330                 return;
  331         }
  332 
  333         /* Allocate private data */
  334         priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  335         if (priv == NULL) {
  336                 log(LOG_ERR, "%s: can't %s for %s\n",
  337                     __func__, "allocate memory", ifp->if_xname);
  338                 NG_NODE_UNREF(node);
  339                 return;
  340         }
  341         NG_NODE_SET_PRIVATE(node, priv);
  342         priv->ifp = ifp;
  343         IFP2NG(ifp) = node;
  344         priv->hwassist = ifp->if_hwassist;
  345 
  346         /* Try to give the node the same name as the interface */
  347         ng_ether_sanitize_ifname(ifp->if_xname, name);
  348         if (ng_name_node(node, name) != 0)
  349                 log(LOG_WARNING, "%s: can't name node %s\n", __func__, name);
  350 }
  351 
  352 /*
  353  * An Ethernet interface is being detached.
  354  * REALLY Destroy its node.
  355  */
  356 static void
  357 ng_ether_detach(struct ifnet *ifp)
  358 {
  359         const node_p node = IFP2NG(ifp);
  360         const priv_p priv = NG_NODE_PRIVATE(node);
  361 
  362         taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
  363         NG_NODE_REALLY_DIE(node);       /* Force real removal of node */
  364         /*
  365          * We can't assume the ifnet is still around when we run shutdown
  366          * So zap it now. XXX We HOPE that anything running at this time
  367          * handles it (as it should in the non netgraph case).
  368          */
  369         IFP2NG(ifp) = NULL;
  370         priv->ifp = NULL;       /* XXX race if interrupted an output packet */
  371         ng_rmnode_self(node);           /* remove all netgraph parts */
  372 }
  373 
  374 /*
  375  * Notify graph about link event.
  376  * if_link_state_change() has already checked that the state has changed.
  377  */
  378 static void
  379 ng_ether_link_state(struct ifnet *ifp, int state)
  380 {
  381         const node_p node = IFP2NG(ifp);
  382         const priv_p priv = NG_NODE_PRIVATE(node);
  383         struct ng_mesg *msg;
  384         int cmd, dummy_error = 0;
  385 
  386         if (state == LINK_STATE_UP)
  387                 cmd = NGM_LINK_IS_UP;
  388         else if (state == LINK_STATE_DOWN)
  389                 cmd = NGM_LINK_IS_DOWN;
  390         else
  391                 return;
  392 
  393         if (priv->lower != NULL) {
  394                 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
  395                 if (msg != NULL)
  396                         NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
  397         }
  398         if (priv->orphan != NULL) {
  399                 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
  400                 if (msg != NULL)
  401                         NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0);
  402         }
  403 }
  404 
  405 /*
  406  * Interface arrival notification handler.
  407  * The notification is produced in two cases:
  408  *  o a new interface arrives
  409  *  o an existing interface got renamed
  410  * Currently the first case is handled by ng_ether_attach via special
  411  * hook ng_ether_attach_p.
  412  */
  413 static void
  414 ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp)
  415 {
  416         char name[IFNAMSIZ];
  417         node_p node;
  418 
  419         /* Only ethernet interfaces are of interest. */
  420         if (ifp->if_type != IFT_ETHER
  421             && ifp->if_type != IFT_L2VLAN)
  422                 return;
  423 
  424         /*
  425          * Just return if it's a new interface without an ng_ether companion.
  426          */
  427         node = IFP2NG(ifp);
  428         if (node == NULL)
  429                 return;
  430 
  431         /* Try to give the node the same name as the new interface name */
  432         ng_ether_sanitize_ifname(ifp->if_xname, name);
  433         if (ng_name_node(node, name) != 0)
  434                 log(LOG_WARNING, "%s: can't re-name node %s\n", __func__, name);
  435 }
  436 
  437 /******************************************************************
  438                     NETGRAPH NODE METHODS
  439 ******************************************************************/
  440 
  441 /*
  442  * It is not possible or allowable to create a node of this type.
  443  * Nodes get created when the interface is attached (or, when
  444  * this node type's KLD is loaded).
  445  */
  446 static int
  447 ng_ether_constructor(node_p node)
  448 {
  449         return (EINVAL);
  450 }
  451 
  452 /*
  453  * Check for attaching a new hook.
  454  */
  455 static  int
  456 ng_ether_newhook(node_p node, hook_p hook, const char *name)
  457 {
  458         const priv_p priv = NG_NODE_PRIVATE(node);
  459         hook_p *hookptr;
  460 
  461         /* Divert hook is an alias for lower */
  462         if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
  463                 name = NG_ETHER_HOOK_LOWER;
  464 
  465         /* Which hook? */
  466         if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) {
  467                 hookptr = &priv->upper;
  468                 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper);
  469                 NG_HOOK_SET_TO_INBOUND(hook);
  470         } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
  471                 hookptr = &priv->lower;
  472                 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
  473         } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
  474                 hookptr = &priv->orphan;
  475                 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
  476         } else
  477                 return (EINVAL);
  478 
  479         /* Check if already connected (shouldn't be, but doesn't hurt) */
  480         if (*hookptr != NULL)
  481                 return (EISCONN);
  482 
  483         /* Disable hardware checksums while 'upper' hook is connected */
  484         if (hookptr == &priv->upper)
  485                 priv->ifp->if_hwassist = 0;
  486         NG_HOOK_HI_STACK(hook);
  487         /* OK */
  488         *hookptr = hook;
  489         return (0);
  490 }
  491 
  492 /*
  493  * Receive an incoming control message.
  494  */
  495 static int
  496 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
  497 {
  498         const priv_p priv = NG_NODE_PRIVATE(node);
  499         struct ng_mesg *resp = NULL;
  500         int error = 0;
  501         struct ng_mesg *msg;
  502 
  503         NGI_GET_MSG(item, msg);
  504         switch (msg->header.typecookie) {
  505         case NGM_ETHER_COOKIE:
  506                 switch (msg->header.cmd) {
  507                 case NGM_ETHER_GET_IFNAME:
  508                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  509                         if (resp == NULL) {
  510                                 error = ENOMEM;
  511                                 break;
  512                         }
  513                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
  514                         break;
  515                 case NGM_ETHER_GET_IFINDEX:
  516                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  517                         if (resp == NULL) {
  518                                 error = ENOMEM;
  519                                 break;
  520                         }
  521                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
  522                         break;
  523                 case NGM_ETHER_GET_ENADDR:
  524                         NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
  525                         if (resp == NULL) {
  526                                 error = ENOMEM;
  527                                 break;
  528                         }
  529                         bcopy(IF_LLADDR(priv->ifp),
  530                             resp->data, ETHER_ADDR_LEN);
  531                         break;
  532                 case NGM_ETHER_SET_ENADDR:
  533                     {
  534                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  535                                 error = EINVAL;
  536                                 break;
  537                         }
  538                         error = if_setlladdr(priv->ifp,
  539                             (u_char *)msg->data, ETHER_ADDR_LEN);
  540                         EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp);
  541                         break;
  542                     }
  543                 case NGM_ETHER_GET_PROMISC:
  544                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  545                         if (resp == NULL) {
  546                                 error = ENOMEM;
  547                                 break;
  548                         }
  549                         *((u_int32_t *)resp->data) = priv->promisc;
  550                         break;
  551                 case NGM_ETHER_SET_PROMISC:
  552                     {
  553                         u_char want;
  554 
  555                         if (msg->header.arglen != sizeof(u_int32_t)) {
  556                                 error = EINVAL;
  557                                 break;
  558                         }
  559                         want = !!*((u_int32_t *)msg->data);
  560                         if (want ^ priv->promisc) {
  561                                 if ((error = ifpromisc(priv->ifp, want)) != 0)
  562                                         break;
  563                                 priv->promisc = want;
  564                         }
  565                         break;
  566                     }
  567                 case NGM_ETHER_GET_AUTOSRC:
  568                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  569                         if (resp == NULL) {
  570                                 error = ENOMEM;
  571                                 break;
  572                         }
  573                         *((u_int32_t *)resp->data) = priv->autoSrcAddr;
  574                         break;
  575                 case NGM_ETHER_SET_AUTOSRC:
  576                         if (msg->header.arglen != sizeof(u_int32_t)) {
  577                                 error = EINVAL;
  578                                 break;
  579                         }
  580                         priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
  581                         break;
  582                 case NGM_ETHER_ADD_MULTI:
  583                     {
  584                         struct sockaddr_dl sa_dl;
  585                         struct ifmultiaddr *ifma;
  586 
  587                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  588                                 error = EINVAL;
  589                                 break;
  590                         }
  591                         bzero(&sa_dl, sizeof(struct sockaddr_dl));
  592                         sa_dl.sdl_len = sizeof(struct sockaddr_dl);
  593                         sa_dl.sdl_family = AF_LINK;
  594                         sa_dl.sdl_alen = ETHER_ADDR_LEN;
  595                         bcopy((void *)msg->data, LLADDR(&sa_dl),
  596                             ETHER_ADDR_LEN);
  597                         /*
  598                          * Netgraph is only permitted to join groups once
  599                          * via the if_addmulti() KPI, because it cannot hold
  600                          * struct ifmultiaddr * between calls. It may also
  601                          * lose a race while we check if the membership
  602                          * already exists.
  603                          */
  604                         if_maddr_rlock(priv->ifp);
  605                         ifma = if_findmulti(priv->ifp,
  606                             (struct sockaddr *)&sa_dl);
  607                         if_maddr_runlock(priv->ifp);
  608                         if (ifma != NULL) {
  609                                 error = EADDRINUSE;
  610                         } else {
  611                                 error = if_addmulti(priv->ifp,
  612                                     (struct sockaddr *)&sa_dl, &ifma);
  613                         }
  614                         break;
  615                     }
  616                 case NGM_ETHER_DEL_MULTI:
  617                     {
  618                         struct sockaddr_dl sa_dl;
  619 
  620                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  621                                 error = EINVAL;
  622                                 break;
  623                         }
  624                         bzero(&sa_dl, sizeof(struct sockaddr_dl));
  625                         sa_dl.sdl_len = sizeof(struct sockaddr_dl);
  626                         sa_dl.sdl_family = AF_LINK;
  627                         sa_dl.sdl_alen = ETHER_ADDR_LEN;
  628                         bcopy((void *)msg->data, LLADDR(&sa_dl),
  629                             ETHER_ADDR_LEN);
  630                         error = if_delmulti(priv->ifp,
  631                             (struct sockaddr *)&sa_dl);
  632                         break;
  633                     }
  634                 case NGM_ETHER_DETACH:
  635                         ng_ether_detach(priv->ifp);
  636                         break;
  637                 default:
  638                         error = EINVAL;
  639                         break;
  640                 }
  641                 break;
  642         default:
  643                 error = EINVAL;
  644                 break;
  645         }
  646         NG_RESPOND_MSG(error, node, item, resp);
  647         NG_FREE_MSG(msg);
  648         return (error);
  649 }
  650 
  651 /*
  652  * Receive data on a hook.
  653  * Since we use per-hook recveive methods this should never be called.
  654  */
  655 static int
  656 ng_ether_rcvdata(hook_p hook, item_p item)
  657 {
  658         NG_FREE_ITEM(item);
  659 
  660         panic("%s: weird hook", __func__);
  661 }
  662 
  663 /*
  664  * Handle an mbuf received on the "lower" or "orphan" hook.
  665  */
  666 static int
  667 ng_ether_rcv_lower(hook_p hook, item_p item)
  668 {
  669         struct mbuf *m;
  670         const node_p node = NG_HOOK_NODE(hook);
  671         const priv_p priv = NG_NODE_PRIVATE(node);
  672         struct ifnet *const ifp = priv->ifp;
  673 
  674         NGI_GET_M(item, m);
  675         NG_FREE_ITEM(item);
  676 
  677         /* Check whether interface is ready for packets */
  678 
  679         if (!((ifp->if_flags & IFF_UP) &&
  680             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  681                 NG_FREE_M(m);
  682                 return (ENETDOWN);
  683         }
  684 
  685         /* Make sure header is fully pulled up */
  686         if (m->m_pkthdr.len < sizeof(struct ether_header)) {
  687                 NG_FREE_M(m);
  688                 return (EINVAL);
  689         }
  690         if (m->m_len < sizeof(struct ether_header)
  691             && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
  692                 return (ENOBUFS);
  693 
  694         /* Drop in the MAC address if desired */
  695         if (priv->autoSrcAddr) {
  696 
  697                 /* Make the mbuf writable if it's not already */
  698                 if (!M_WRITABLE(m)
  699                     && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
  700                         return (ENOBUFS);
  701 
  702                 /* Overwrite source MAC address */
  703                 bcopy(IF_LLADDR(ifp),
  704                     mtod(m, struct ether_header *)->ether_shost,
  705                     ETHER_ADDR_LEN);
  706         }
  707 
  708         /* Send it on its way */
  709         return ether_output_frame(ifp, m);
  710 }
  711 
  712 /*
  713  * Handle an mbuf received on the "upper" hook.
  714  */
  715 static int
  716 ng_ether_rcv_upper(hook_p hook, item_p item)
  717 {
  718         struct mbuf *m;
  719         const node_p node = NG_HOOK_NODE(hook);
  720         const priv_p priv = NG_NODE_PRIVATE(node);
  721         struct ifnet *ifp = priv->ifp;
  722 
  723         NGI_GET_M(item, m);
  724         NG_FREE_ITEM(item);
  725 
  726         /* Check length and pull off header */
  727         if (m->m_pkthdr.len < sizeof(struct ether_header)) {
  728                 NG_FREE_M(m);
  729                 return (EINVAL);
  730         }
  731         if (m->m_len < sizeof(struct ether_header) &&
  732             (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
  733                 return (ENOBUFS);
  734 
  735         m->m_pkthdr.rcvif = ifp;
  736 
  737         /* Pass the packet to the bridge, it may come back to us */
  738         if (ifp->if_bridge) {
  739                 BRIDGE_INPUT(ifp, m);
  740                 if (m == NULL)
  741                         return (0);
  742         }
  743 
  744         /* Route packet back in */
  745         ether_demux(ifp, m);
  746         return (0);
  747 }
  748 
  749 /*
  750  * Shutdown node. This resets the node but does not remove it
  751  * unless the REALLY_DIE flag is set.
  752  */
  753 static int
  754 ng_ether_shutdown(node_p node)
  755 {
  756         const priv_p priv = NG_NODE_PRIVATE(node);
  757 
  758         if (node->nd_flags & NGF_REALLY_DIE) {
  759                 /*
  760                  * WE came here because the ethernet card is being unloaded,
  761                  * so stop being persistant.
  762                  * Actually undo all the things we did on creation.
  763                  * Assume the ifp has already been freed.
  764                  */
  765                 NG_NODE_SET_PRIVATE(node, NULL);
  766                 free(priv, M_NETGRAPH);         
  767                 NG_NODE_UNREF(node);    /* free node itself */
  768                 return (0);
  769         }
  770         if (priv->promisc) {            /* disable promiscuous mode */
  771                 (void)ifpromisc(priv->ifp, 0);
  772                 priv->promisc = 0;
  773         }
  774         NG_NODE_REVIVE(node);           /* Signal ng_rmnode we are persisant */
  775 
  776         return (0);
  777 }
  778 
  779 /*
  780  * Hook disconnection.
  781  */
  782 static int
  783 ng_ether_disconnect(hook_p hook)
  784 {
  785         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  786 
  787         if (hook == priv->upper) {
  788                 priv->upper = NULL;
  789                 if (priv->ifp != NULL)          /* restore h/w csum */
  790                         priv->ifp->if_hwassist = priv->hwassist;
  791         } else if (hook == priv->lower)
  792                 priv->lower = NULL;
  793         else if (hook == priv->orphan)
  794                 priv->orphan = NULL;
  795         else
  796                 panic("%s: weird hook", __func__);
  797         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  798         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  799                 ng_rmnode_self(NG_HOOK_NODE(hook));     /* reset node */
  800         return (0);
  801 }
  802 
  803 /******************************************************************
  804                         INITIALIZATION
  805 ******************************************************************/
  806 
  807 /*
  808  * Handle loading and unloading for this node type.
  809  */
  810 static int
  811 ng_ether_mod_event(module_t mod, int event, void *data)
  812 {
  813         int error = 0;
  814         int s;
  815 
  816         s = splnet();
  817         switch (event) {
  818         case MOD_LOAD:
  819 
  820                 /* Register function hooks */
  821                 if (ng_ether_attach_p != NULL) {
  822                         error = EEXIST;
  823                         break;
  824                 }
  825                 ng_ether_attach_p = ng_ether_attach;
  826                 ng_ether_detach_p = ng_ether_detach;
  827                 ng_ether_output_p = ng_ether_output;
  828                 ng_ether_input_p = ng_ether_input;
  829                 ng_ether_input_orphan_p = ng_ether_input_orphan;
  830                 ng_ether_link_state_p = ng_ether_link_state;
  831 
  832                 ng_ether_ifnet_arrival_cookie =
  833                     EVENTHANDLER_REGISTER(ifnet_arrival_event,
  834                     ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY);
  835                 break;
  836 
  837         case MOD_UNLOAD:
  838 
  839                 /*
  840                  * Note that the base code won't try to unload us until
  841                  * all nodes have been removed, and that can't happen
  842                  * until all Ethernet interfaces are removed. In any
  843                  * case, we know there are no nodes left if the action
  844                  * is MOD_UNLOAD, so there's no need to detach any nodes.
  845                  */
  846 
  847                 EVENTHANDLER_DEREGISTER(ifnet_arrival_event,
  848                     ng_ether_ifnet_arrival_cookie);
  849 
  850                 /* Unregister function hooks */
  851                 ng_ether_attach_p = NULL;
  852                 ng_ether_detach_p = NULL;
  853                 ng_ether_output_p = NULL;
  854                 ng_ether_input_p = NULL;
  855                 ng_ether_input_orphan_p = NULL;
  856                 ng_ether_link_state_p = NULL;
  857                 break;
  858 
  859         default:
  860                 error = EOPNOTSUPP;
  861                 break;
  862         }
  863         splx(s);
  864         return (error);
  865 }
  866 
  867 static void
  868 vnet_ng_ether_init(const void *unused)
  869 {
  870         struct ifnet *ifp;
  871 
  872         /* If module load was rejected, don't attach to vnets. */
  873         if (ng_ether_attach_p != ng_ether_attach)
  874                 return;
  875 
  876         /* Create nodes for any already-existing Ethernet interfaces. */
  877         IFNET_RLOCK();
  878         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
  879                 if (ifp->if_type == IFT_ETHER
  880                     || ifp->if_type == IFT_L2VLAN)
  881                         ng_ether_attach(ifp);
  882         }
  883         IFNET_RUNLOCK();
  884 }
  885 VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  886     vnet_ng_ether_init, NULL);

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