The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_gif.c

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    1 /*
    2  * ng_gif.c
    3  */
    4 
    5 /*-
    6  * Copyright 2001 The Aerospace Corporation.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  *
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions, and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions, and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. The name of The Aerospace Corporation may not be used to endorse or
   18  *    promote products derived from this software.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *
   33  * Copyright (c) 1996-2000 Whistle Communications, Inc.
   34  * All rights reserved.
   35  * 
   36  * Subject to the following obligations and disclaimer of warranty, use and
   37  * redistribution of this software, in source or object code forms, with or
   38  * without modifications are expressly permitted by Whistle Communications;
   39  * provided, however, that:
   40  * 1. Any and all reproductions of the source or object code must include the
   41  *    copyright notice above and the following disclaimer of warranties; and
   42  * 2. No rights are granted, in any manner or form, to use Whistle
   43  *    Communications, Inc. trademarks, including the mark "WHISTLE
   44  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   45  *    such appears in the above copyright notice or in the software.
   46  * 
   47  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   48  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   49  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   50  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   51  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   52  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   53  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   54  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   55  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   56  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   57  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   58  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   59  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   60  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   61  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   62  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   63  * OF SUCH DAMAGE.
   64  *
   65  * $FreeBSD: releng/5.4/sys/netgraph/ng_gif.c 141090 2005-01-31 23:27:04Z imp $
   66  */
   67 
   68 /*
   69  * ng_gif(4) netgraph node type
   70  */
   71 
   72 #include <sys/param.h>
   73 #include <sys/systm.h>
   74 #include <sys/kernel.h>
   75 #include <sys/malloc.h>
   76 #include <sys/mbuf.h>
   77 #include <sys/errno.h>
   78 #include <sys/syslog.h>
   79 #include <sys/socket.h>
   80 
   81 #include <net/if.h>
   82 #include <net/route.h>
   83 #include <net/if_types.h>
   84 #include <net/if_var.h>
   85 #include <net/if_gif.h>
   86 
   87 #include <netgraph/ng_message.h>
   88 #include <netgraph/netgraph.h>
   89 #include <netgraph/ng_parse.h>
   90 #include <netgraph/ng_gif.h>
   91 
   92 #define IFP2NG(ifp)  ((struct ng_node *)((struct gif_softc *)(ifp))->gif_netgraph)
   93 #define IFP2NG_SET(ifp, val)  (((struct gif_softc *)(ifp))->gif_netgraph = (val))
   94 
   95 /* Per-node private data */
   96 struct private {
   97         struct ifnet    *ifp;           /* associated interface */
   98         hook_p          lower;          /* lower OR orphan hook connection */
   99         u_char          lowerOrphan;    /* whether lower is lower or orphan */
  100 };
  101 typedef struct private *priv_p;
  102 
  103 /* Functional hooks called from if_gif.c */
  104 static void     ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af);
  105 static void     ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af);
  106 static void     ng_gif_attach(struct ifnet *ifp);
  107 static void     ng_gif_detach(struct ifnet *ifp); 
  108 
  109 /* Other functions */
  110 static void     ng_gif_input2(node_p node, struct mbuf **mp, int af);
  111 static int      ng_gif_glue_af(struct mbuf **mp, int af);
  112 static int      ng_gif_rcv_lower(node_p node, struct mbuf *m);
  113 
  114 /* Netgraph node methods */
  115 static ng_constructor_t ng_gif_constructor;
  116 static ng_rcvmsg_t      ng_gif_rcvmsg;
  117 static ng_shutdown_t    ng_gif_shutdown;
  118 static ng_newhook_t     ng_gif_newhook;
  119 static ng_connect_t     ng_gif_connect;
  120 static ng_rcvdata_t     ng_gif_rcvdata;
  121 static ng_disconnect_t  ng_gif_disconnect;
  122 static int              ng_gif_mod_event(module_t mod, int event, void *data);
  123 
  124 /* List of commands and how to convert arguments to/from ASCII */
  125 static const struct ng_cmdlist ng_gif_cmdlist[] = {
  126         {
  127           NGM_GIF_COOKIE,
  128           NGM_GIF_GET_IFNAME,
  129           "getifname",
  130           NULL,
  131           &ng_parse_string_type
  132         },
  133         {
  134           NGM_GIF_COOKIE,
  135           NGM_GIF_GET_IFINDEX,
  136           "getifindex",
  137           NULL,
  138           &ng_parse_int32_type
  139         },
  140         { 0 }
  141 };
  142 
  143 static struct ng_type ng_gif_typestruct = {
  144         .version =      NG_ABI_VERSION,
  145         .name =         NG_GIF_NODE_TYPE,
  146         .mod_event =    ng_gif_mod_event,
  147         .constructor =  ng_gif_constructor,
  148         .rcvmsg =       ng_gif_rcvmsg,
  149         .shutdown =     ng_gif_shutdown,
  150         .newhook =      ng_gif_newhook,
  151         .connect =      ng_gif_connect,
  152         .rcvdata =      ng_gif_rcvdata,
  153         .disconnect =   ng_gif_disconnect,
  154         .cmdlist =      ng_gif_cmdlist,
  155 };
  156 MODULE_VERSION(ng_gif, 1);
  157 MODULE_DEPEND(ng_gif, if_gif, 1,1,1);
  158 NETGRAPH_INIT(gif, &ng_gif_typestruct);
  159 
  160 /******************************************************************
  161                        GIF FUNCTION HOOKS
  162 ******************************************************************/
  163 
  164 /*
  165  * Handle a packet that has come in on an interface. We get to
  166  * look at it here before any upper layer protocols do.
  167  *
  168  * NOTE: this function will get called at splimp()
  169  */
  170 static void
  171 ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af)
  172 {
  173         const node_p node = IFP2NG(ifp);
  174         const priv_p priv = NG_NODE_PRIVATE(node);
  175 
  176         /* If "lower" hook not connected, let packet continue */
  177         if (priv->lower == NULL || priv->lowerOrphan)
  178                 return;
  179         ng_gif_input2(node, mp, af);
  180 }
  181 
  182 /*
  183  * Handle a packet that has come in on an interface, and which
  184  * does not match any of our known protocols (an ``orphan'').
  185  *
  186  * NOTE: this function will get called at splimp()
  187  */
  188 static void
  189 ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af)
  190 {
  191         const node_p node = IFP2NG(ifp);
  192         const priv_p priv = NG_NODE_PRIVATE(node);
  193 
  194         /* If "orphan" hook not connected, let packet continue */
  195         if (priv->lower == NULL || !priv->lowerOrphan) {
  196                 m_freem(m);
  197                 return;
  198         }
  199         ng_gif_input2(node, &m, af);
  200         if (m != NULL)
  201                 m_freem(m);
  202 }
  203 
  204 /*
  205  * Handle a packet that has come in on a gif interface.
  206  * Attach the address family to the mbuf for later use.
  207  *
  208  * NOTE: this function will get called at splimp()
  209  */
  210 static void
  211 ng_gif_input2(node_p node, struct mbuf **mp, int af)
  212 {
  213         const priv_p priv = NG_NODE_PRIVATE(node);
  214         int error;
  215 
  216         /* Glue address family on */
  217         if ((error = ng_gif_glue_af(mp, af)) != 0)
  218                 return;
  219 
  220         /* Send out lower/orphan hook */
  221         NG_SEND_DATA_ONLY(error, priv->lower, *mp);
  222         *mp = NULL;
  223 }
  224 
  225 /*
  226  * A new gif interface has been attached.
  227  * Create a new node for it, etc.
  228  */
  229 static void
  230 ng_gif_attach(struct ifnet *ifp)
  231 {
  232         priv_p priv;
  233         node_p node;
  234 
  235         /* Create node */
  236         KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
  237         if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) {
  238                 log(LOG_ERR, "%s: can't %s for %s\n",
  239                     __func__, "create node", ifp->if_xname);
  240                 return;
  241         }
  242 
  243         /* Allocate private data */
  244         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  245         if (priv == NULL) {
  246                 log(LOG_ERR, "%s: can't %s for %s\n",
  247                     __func__, "allocate memory", ifp->if_xname);
  248                 NG_NODE_UNREF(node);
  249                 return;
  250         }
  251         NG_NODE_SET_PRIVATE(node, priv);
  252         priv->ifp = ifp;
  253         IFP2NG_SET(ifp, node);
  254 
  255         /* Try to give the node the same name as the interface */
  256         if (ng_name_node(node, ifp->if_xname) != 0) {
  257                 log(LOG_WARNING, "%s: can't name node %s\n",
  258                     __func__, ifp->if_xname);
  259         }
  260 }
  261 
  262 /*
  263  * An interface is being detached.
  264  * REALLY Destroy its node.
  265  */
  266 static void
  267 ng_gif_detach(struct ifnet *ifp)
  268 {
  269         const node_p node = IFP2NG(ifp);
  270         priv_p priv;
  271 
  272         if (node == NULL)               /* no node (why not?), ignore */
  273                 return;
  274         priv = NG_NODE_PRIVATE(node);
  275         NG_NODE_REALLY_DIE(node);       /* Force real removal of node */
  276         /*
  277          * We can't assume the ifnet is still around when we run shutdown
  278          * So zap it now. XXX We HOPE that anything running at this time
  279          * handles it (as it should in the non netgraph case).
  280          */
  281         IFP2NG_SET(ifp, NULL);
  282         priv->ifp = NULL;       /* XXX race if interrupted an output packet */
  283         ng_rmnode_self(node);           /* remove all netgraph parts */
  284 }
  285 
  286 /*
  287  * Optimization for gluing the address family onto
  288  * the front of an incoming packet.
  289  */
  290 static int
  291 ng_gif_glue_af(struct mbuf **mp, int af)
  292 {
  293         struct mbuf *m = *mp;
  294         int error = 0;
  295         sa_family_t tmp_af;
  296 
  297         tmp_af = (sa_family_t) af;
  298 
  299         /*
  300          * XXX: should try to bring back some of the optimizations from
  301          * ng_ether.c
  302          */
  303 
  304         /*
  305          * Doing anything more is likely to get more
  306          * expensive than it's worth..
  307          * it's probable that everything else is in one
  308          * big lump. The next node will do an m_pullup()
  309          * for exactly the amount of data it needs and
  310          * hopefully everything after that will not
  311          * need one. So let's just use M_PREPEND.
  312          */
  313         M_PREPEND(m, sizeof (tmp_af), M_DONTWAIT);
  314         if (m == NULL) {
  315                 error = ENOBUFS;
  316                 goto done;
  317         }
  318 
  319 #if 0
  320 copy:
  321 #endif
  322         /* Copy header and return (possibly new) mbuf */
  323         *mtod(m, sa_family_t *) = tmp_af;
  324 #if 0
  325         bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af));
  326 #endif
  327 done:
  328         *mp = m;
  329         return error;
  330 }
  331 
  332 /******************************************************************
  333                     NETGRAPH NODE METHODS
  334 ******************************************************************/
  335 
  336 /*
  337  * It is not possible or allowable to create a node of this type.
  338  * Nodes get created when the interface is attached (or, when
  339  * this node type's KLD is loaded).
  340  */
  341 static int
  342 ng_gif_constructor(node_p node)
  343 {
  344         return (EINVAL);
  345 }
  346 
  347 /*
  348  * Check for attaching a new hook.
  349  */
  350 static  int
  351 ng_gif_newhook(node_p node, hook_p hook, const char *name)
  352 {
  353         const priv_p priv = NG_NODE_PRIVATE(node);
  354         u_char orphan = priv->lowerOrphan;
  355         hook_p *hookptr;
  356 
  357         /* Divert hook is an alias for lower */
  358         if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0)
  359                 name = NG_GIF_HOOK_LOWER;
  360 
  361         /* Which hook? */
  362         if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) {
  363                 hookptr = &priv->lower;
  364                 orphan = 0;
  365         } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) {
  366                 hookptr = &priv->lower;
  367                 orphan = 1;
  368         } else
  369                 return (EINVAL);
  370 
  371         /* Check if already connected (shouldn't be, but doesn't hurt) */
  372         if (*hookptr != NULL)
  373                 return (EISCONN);
  374 
  375         /* OK */
  376         *hookptr = hook;
  377         priv->lowerOrphan = orphan;
  378         return (0);
  379 }
  380 
  381 /*
  382  * Hooks are attached, adjust to force queueing.
  383  * We don't really care which hook it is.
  384  * they should all be queuing for outgoing data.
  385  */
  386 static  int
  387 ng_gif_connect(hook_p hook)
  388 {
  389         NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
  390         return (0);
  391 }
  392 
  393 /*
  394  * Receive an incoming control message.
  395  */
  396 static int
  397 ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook)
  398 {
  399         const priv_p priv = NG_NODE_PRIVATE(node);
  400         struct ng_mesg *resp = NULL;
  401         int error = 0;
  402         struct ng_mesg *msg;
  403 
  404         NGI_GET_MSG(item, msg);
  405         switch (msg->header.typecookie) {
  406         case NGM_GIF_COOKIE:
  407                 switch (msg->header.cmd) {
  408                 case NGM_GIF_GET_IFNAME:
  409                         NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
  410                         if (resp == NULL) {
  411                                 error = ENOMEM;
  412                                 break;
  413                         }
  414                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1);
  415                         break;
  416                 case NGM_GIF_GET_IFINDEX:
  417                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  418                         if (resp == NULL) {
  419                                 error = ENOMEM;
  420                                 break;
  421                         }
  422                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
  423                         break;
  424                 default:
  425                         error = EINVAL;
  426                         break;
  427                 }
  428                 break;
  429         default:
  430                 error = EINVAL;
  431                 break;
  432         }
  433         NG_RESPOND_MSG(error, node, item, resp);
  434         NG_FREE_MSG(msg);
  435         return (error);
  436 }
  437 
  438 /*
  439  * Receive data on a hook.
  440  */
  441 static int
  442 ng_gif_rcvdata(hook_p hook, item_p item)
  443 {
  444         const node_p node = NG_HOOK_NODE(hook);
  445         const priv_p priv = NG_NODE_PRIVATE(node);
  446         struct mbuf *m;
  447 
  448         NGI_GET_M(item, m);
  449         NG_FREE_ITEM(item);
  450 
  451         if (hook == priv->lower)
  452                 return ng_gif_rcv_lower(node, m);
  453         panic("%s: weird hook", __func__);
  454 }
  455 
  456 /*
  457  * Handle an mbuf received on the "lower" hook.
  458  */
  459 static int
  460 ng_gif_rcv_lower(node_p node, struct mbuf *m)
  461 {
  462         struct sockaddr dst;
  463         const priv_p priv = NG_NODE_PRIVATE(node);
  464 
  465         bzero(&dst, sizeof(dst));
  466 
  467         /* Make sure header is fully pulled up */
  468         if (m->m_pkthdr.len < sizeof(sa_family_t)) {
  469                 NG_FREE_M(m);
  470                 return (EINVAL);
  471         }
  472         if (m->m_len < sizeof(sa_family_t)
  473             && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
  474                 return (ENOBUFS);
  475         }
  476 
  477         dst.sa_family = *mtod(m, sa_family_t *);
  478         m_adj(m, sizeof(sa_family_t));
  479 
  480         /* Send it on its way */
  481         /*
  482          * XXX: gif_output only uses dst for the family and passes the
  483          * fourth argument (rt) to in{,6}_gif_output which ignore it.
  484          * If this changes ng_gif will probably break.
  485          */
  486         return gif_output(priv->ifp, m, &dst, NULL);
  487 }
  488 
  489 /*
  490  * Shutdown node. This resets the node but does not remove it
  491  * unless the REALLY_DIE flag is set.
  492  */
  493 static int
  494 ng_gif_shutdown(node_p node)
  495 {
  496         const priv_p priv = NG_NODE_PRIVATE(node);
  497 
  498         if (node->nd_flags & NGF_REALLY_DIE) {
  499                 /*
  500                  * WE came here because the gif interface is being destroyed,
  501                  * so stop being persistant.
  502                  * Actually undo all the things we did on creation.
  503                  * Assume the ifp has already been freed.
  504                  */
  505                 NG_NODE_SET_PRIVATE(node, NULL);
  506                 FREE(priv, M_NETGRAPH);         
  507                 NG_NODE_UNREF(node);    /* free node itself */
  508                 return (0);
  509         }
  510         NG_NODE_REVIVE(node);           /* Signal ng_rmnode we are persisant */
  511         return (0);
  512 }
  513 
  514 /*
  515  * Hook disconnection.
  516  */
  517 static int
  518 ng_gif_disconnect(hook_p hook)
  519 {
  520         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  521 
  522         if (hook == priv->lower) {
  523                 priv->lower = NULL;
  524                 priv->lowerOrphan = 0;
  525         } else 
  526                 panic("%s: weird hook", __func__);
  527         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  528             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  529                 ng_rmnode_self(NG_HOOK_NODE(hook));     /* reset node */
  530 
  531         return (0);
  532 }
  533 
  534 /******************************************************************
  535                         INITIALIZATION
  536 ******************************************************************/
  537 
  538 /*
  539  * Handle loading and unloading for this node type.
  540  */
  541 static int
  542 ng_gif_mod_event(module_t mod, int event, void *data)
  543 {
  544         struct ifnet *ifp;
  545         int error = 0;
  546         int s;
  547 
  548         s = splnet();
  549         switch (event) {
  550         case MOD_LOAD:
  551 
  552                 /* Register function hooks */
  553                 if (ng_gif_attach_p != NULL) {
  554                         error = EEXIST;
  555                         break;
  556                 }
  557                 ng_gif_attach_p = ng_gif_attach;
  558                 ng_gif_detach_p = ng_gif_detach;
  559                 ng_gif_input_p = ng_gif_input;
  560                 ng_gif_input_orphan_p = ng_gif_input_orphan;
  561 
  562                 /* Create nodes for any already-existing gif interfaces */
  563                 IFNET_RLOCK();
  564                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
  565                         if (ifp->if_type == IFT_GIF)
  566                                 ng_gif_attach(ifp);
  567                 }
  568                 IFNET_RUNLOCK();
  569                 break;
  570 
  571         case MOD_UNLOAD:
  572 
  573                 /*
  574                  * Note that the base code won't try to unload us until
  575                  * all nodes have been removed, and that can't happen
  576                  * until all gif interfaces are destroyed. In any
  577                  * case, we know there are no nodes left if the action
  578                  * is MOD_UNLOAD, so there's no need to detach any nodes.
  579                  *
  580                  * XXX: what about manual unloads?!?
  581                  */
  582 
  583                 /* Unregister function hooks */
  584                 ng_gif_attach_p = NULL;
  585                 ng_gif_detach_p = NULL;
  586                 ng_gif_input_p = NULL;
  587                 ng_gif_input_orphan_p = NULL;
  588                 break;
  589 
  590         default:
  591                 error = EOPNOTSUPP;
  592                 break;
  593         }
  594         splx(s);
  595         return (error);
  596 }
  597 

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