The Design and Implementation of the FreeBSD Operating System, Second Edition
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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/7.4/sys/netgraph/ng_gif.c 147256 2005-06-10 16:49:24Z brooks $
   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->if_softc))->gif_netgraph)
   93 #define IFP2NG_SET(ifp, val)  (((struct gif_softc *)(ifp->if_softc))->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_DEPEND(ng_gif, if_gif, 1,1,1);
  157 NETGRAPH_INIT(gif, &ng_gif_typestruct);
  158 
  159 /******************************************************************
  160                        GIF FUNCTION HOOKS
  161 ******************************************************************/
  162 
  163 /*
  164  * Handle a packet that has come in on an interface. We get to
  165  * look at it here before any upper layer protocols do.
  166  *
  167  * NOTE: this function will get called at splimp()
  168  */
  169 static void
  170 ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af)
  171 {
  172         const node_p node = IFP2NG(ifp);
  173         const priv_p priv = NG_NODE_PRIVATE(node);
  174 
  175         /* If "lower" hook not connected, let packet continue */
  176         if (priv->lower == NULL || priv->lowerOrphan)
  177                 return;
  178         ng_gif_input2(node, mp, af);
  179 }
  180 
  181 /*
  182  * Handle a packet that has come in on an interface, and which
  183  * does not match any of our known protocols (an ``orphan'').
  184  *
  185  * NOTE: this function will get called at splimp()
  186  */
  187 static void
  188 ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af)
  189 {
  190         const node_p node = IFP2NG(ifp);
  191         const priv_p priv = NG_NODE_PRIVATE(node);
  192 
  193         /* If "orphan" hook not connected, let packet continue */
  194         if (priv->lower == NULL || !priv->lowerOrphan) {
  195                 m_freem(m);
  196                 return;
  197         }
  198         ng_gif_input2(node, &m, af);
  199         if (m != NULL)
  200                 m_freem(m);
  201 }
  202 
  203 /*
  204  * Handle a packet that has come in on a gif interface.
  205  * Attach the address family to the mbuf for later use.
  206  *
  207  * NOTE: this function will get called at splimp()
  208  */
  209 static void
  210 ng_gif_input2(node_p node, struct mbuf **mp, int af)
  211 {
  212         const priv_p priv = NG_NODE_PRIVATE(node);
  213         int error;
  214 
  215         /* Glue address family on */
  216         if ((error = ng_gif_glue_af(mp, af)) != 0)
  217                 return;
  218 
  219         /* Send out lower/orphan hook */
  220         NG_SEND_DATA_ONLY(error, priv->lower, *mp);
  221         *mp = NULL;
  222 }
  223 
  224 /*
  225  * A new gif interface has been attached.
  226  * Create a new node for it, etc.
  227  */
  228 static void
  229 ng_gif_attach(struct ifnet *ifp)
  230 {
  231         priv_p priv;
  232         node_p node;
  233 
  234         /* Create node */
  235         KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
  236         if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) {
  237                 log(LOG_ERR, "%s: can't %s for %s\n",
  238                     __func__, "create node", ifp->if_xname);
  239                 return;
  240         }
  241 
  242         /* Allocate private data */
  243         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  244         if (priv == NULL) {
  245                 log(LOG_ERR, "%s: can't %s for %s\n",
  246                     __func__, "allocate memory", ifp->if_xname);
  247                 NG_NODE_UNREF(node);
  248                 return;
  249         }
  250         NG_NODE_SET_PRIVATE(node, priv);
  251         priv->ifp = ifp;
  252         IFP2NG_SET(ifp, node);
  253 
  254         /* Try to give the node the same name as the interface */
  255         if (ng_name_node(node, ifp->if_xname) != 0) {
  256                 log(LOG_WARNING, "%s: can't name node %s\n",
  257                     __func__, ifp->if_xname);
  258         }
  259 }
  260 
  261 /*
  262  * An interface is being detached.
  263  * REALLY Destroy its node.
  264  */
  265 static void
  266 ng_gif_detach(struct ifnet *ifp)
  267 {
  268         const node_p node = IFP2NG(ifp);
  269         priv_p priv;
  270 
  271         if (node == NULL)               /* no node (why not?), ignore */
  272                 return;
  273         priv = NG_NODE_PRIVATE(node);
  274         NG_NODE_REALLY_DIE(node);       /* Force real removal of node */
  275         /*
  276          * We can't assume the ifnet is still around when we run shutdown
  277          * So zap it now. XXX We HOPE that anything running at this time
  278          * handles it (as it should in the non netgraph case).
  279          */
  280         IFP2NG_SET(ifp, NULL);
  281         priv->ifp = NULL;       /* XXX race if interrupted an output packet */
  282         ng_rmnode_self(node);           /* remove all netgraph parts */
  283 }
  284 
  285 /*
  286  * Optimization for gluing the address family onto
  287  * the front of an incoming packet.
  288  */
  289 static int
  290 ng_gif_glue_af(struct mbuf **mp, int af)
  291 {
  292         struct mbuf *m = *mp;
  293         int error = 0;
  294         sa_family_t tmp_af;
  295 
  296         tmp_af = (sa_family_t) af;
  297 
  298         /*
  299          * XXX: should try to bring back some of the optimizations from
  300          * ng_ether.c
  301          */
  302 
  303         /*
  304          * Doing anything more is likely to get more
  305          * expensive than it's worth..
  306          * it's probable that everything else is in one
  307          * big lump. The next node will do an m_pullup()
  308          * for exactly the amount of data it needs and
  309          * hopefully everything after that will not
  310          * need one. So let's just use M_PREPEND.
  311          */
  312         M_PREPEND(m, sizeof (tmp_af), M_DONTWAIT);
  313         if (m == NULL) {
  314                 error = ENOBUFS;
  315                 goto done;
  316         }
  317 
  318 #if 0
  319 copy:
  320 #endif
  321         /* Copy header and return (possibly new) mbuf */
  322         *mtod(m, sa_family_t *) = tmp_af;
  323 #if 0
  324         bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af));
  325 #endif
  326 done:
  327         *mp = m;
  328         return error;
  329 }
  330 
  331 /******************************************************************
  332                     NETGRAPH NODE METHODS
  333 ******************************************************************/
  334 
  335 /*
  336  * It is not possible or allowable to create a node of this type.
  337  * Nodes get created when the interface is attached (or, when
  338  * this node type's KLD is loaded).
  339  */
  340 static int
  341 ng_gif_constructor(node_p node)
  342 {
  343         return (EINVAL);
  344 }
  345 
  346 /*
  347  * Check for attaching a new hook.
  348  */
  349 static  int
  350 ng_gif_newhook(node_p node, hook_p hook, const char *name)
  351 {
  352         const priv_p priv = NG_NODE_PRIVATE(node);
  353         u_char orphan = priv->lowerOrphan;
  354         hook_p *hookptr;
  355 
  356         /* Divert hook is an alias for lower */
  357         if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0)
  358                 name = NG_GIF_HOOK_LOWER;
  359 
  360         /* Which hook? */
  361         if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) {
  362                 hookptr = &priv->lower;
  363                 orphan = 0;
  364         } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) {
  365                 hookptr = &priv->lower;
  366                 orphan = 1;
  367         } else
  368                 return (EINVAL);
  369 
  370         /* Check if already connected (shouldn't be, but doesn't hurt) */
  371         if (*hookptr != NULL)
  372                 return (EISCONN);
  373 
  374         /* OK */
  375         *hookptr = hook;
  376         priv->lowerOrphan = orphan;
  377         return (0);
  378 }
  379 
  380 /*
  381  * Hooks are attached, adjust to force queueing.
  382  * We don't really care which hook it is.
  383  * they should all be queuing for outgoing data.
  384  */
  385 static  int
  386 ng_gif_connect(hook_p hook)
  387 {
  388         NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
  389         return (0);
  390 }
  391 
  392 /*
  393  * Receive an incoming control message.
  394  */
  395 static int
  396 ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook)
  397 {
  398         const priv_p priv = NG_NODE_PRIVATE(node);
  399         struct ng_mesg *resp = NULL;
  400         int error = 0;
  401         struct ng_mesg *msg;
  402 
  403         NGI_GET_MSG(item, msg);
  404         switch (msg->header.typecookie) {
  405         case NGM_GIF_COOKIE:
  406                 switch (msg->header.cmd) {
  407                 case NGM_GIF_GET_IFNAME:
  408                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  409                         if (resp == NULL) {
  410                                 error = ENOMEM;
  411                                 break;
  412                         }
  413                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
  414                         break;
  415                 case NGM_GIF_GET_IFINDEX:
  416                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  417                         if (resp == NULL) {
  418                                 error = ENOMEM;
  419                                 break;
  420                         }
  421                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
  422                         break;
  423                 default:
  424                         error = EINVAL;
  425                         break;
  426                 }
  427                 break;
  428         default:
  429                 error = EINVAL;
  430                 break;
  431         }
  432         NG_RESPOND_MSG(error, node, item, resp);
  433         NG_FREE_MSG(msg);
  434         return (error);
  435 }
  436 
  437 /*
  438  * Receive data on a hook.
  439  */
  440 static int
  441 ng_gif_rcvdata(hook_p hook, item_p item)
  442 {
  443         const node_p node = NG_HOOK_NODE(hook);
  444         const priv_p priv = NG_NODE_PRIVATE(node);
  445         struct mbuf *m;
  446 
  447         NGI_GET_M(item, m);
  448         NG_FREE_ITEM(item);
  449 
  450         if (hook == priv->lower)
  451                 return ng_gif_rcv_lower(node, m);
  452         panic("%s: weird hook", __func__);
  453 }
  454 
  455 /*
  456  * Handle an mbuf received on the "lower" hook.
  457  */
  458 static int
  459 ng_gif_rcv_lower(node_p node, struct mbuf *m)
  460 {
  461         struct sockaddr dst;
  462         const priv_p priv = NG_NODE_PRIVATE(node);
  463 
  464         bzero(&dst, sizeof(dst));
  465 
  466         /* Make sure header is fully pulled up */
  467         if (m->m_pkthdr.len < sizeof(sa_family_t)) {
  468                 NG_FREE_M(m);
  469                 return (EINVAL);
  470         }
  471         if (m->m_len < sizeof(sa_family_t)
  472             && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
  473                 return (ENOBUFS);
  474         }
  475 
  476         dst.sa_family = *mtod(m, sa_family_t *);
  477         m_adj(m, sizeof(sa_family_t));
  478 
  479         /* Send it on its way */
  480         /*
  481          * XXX: gif_output only uses dst for the family and passes the
  482          * fourth argument (rt) to in{,6}_gif_output which ignore it.
  483          * If this changes ng_gif will probably break.
  484          */
  485         return gif_output(priv->ifp, m, &dst, NULL);
  486 }
  487 
  488 /*
  489  * Shutdown node. This resets the node but does not remove it
  490  * unless the REALLY_DIE flag is set.
  491  */
  492 static int
  493 ng_gif_shutdown(node_p node)
  494 {
  495         const priv_p priv = NG_NODE_PRIVATE(node);
  496 
  497         if (node->nd_flags & NGF_REALLY_DIE) {
  498                 /*
  499                  * WE came here because the gif interface is being destroyed,
  500                  * so stop being persistant.
  501                  * Actually undo all the things we did on creation.
  502                  * Assume the ifp has already been freed.
  503                  */
  504                 NG_NODE_SET_PRIVATE(node, NULL);
  505                 FREE(priv, M_NETGRAPH);         
  506                 NG_NODE_UNREF(node);    /* free node itself */
  507                 return (0);
  508         }
  509         NG_NODE_REVIVE(node);           /* Signal ng_rmnode we are persisant */
  510         return (0);
  511 }
  512 
  513 /*
  514  * Hook disconnection.
  515  */
  516 static int
  517 ng_gif_disconnect(hook_p hook)
  518 {
  519         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  520 
  521         if (hook == priv->lower) {
  522                 priv->lower = NULL;
  523                 priv->lowerOrphan = 0;
  524         } else 
  525                 panic("%s: weird hook", __func__);
  526         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  527             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  528                 ng_rmnode_self(NG_HOOK_NODE(hook));     /* reset node */
  529 
  530         return (0);
  531 }
  532 
  533 /******************************************************************
  534                         INITIALIZATION
  535 ******************************************************************/
  536 
  537 /*
  538  * Handle loading and unloading for this node type.
  539  */
  540 static int
  541 ng_gif_mod_event(module_t mod, int event, void *data)
  542 {
  543         struct ifnet *ifp;
  544         int error = 0;
  545         int s;
  546 
  547         s = splnet();
  548         switch (event) {
  549         case MOD_LOAD:
  550 
  551                 /* Register function hooks */
  552                 if (ng_gif_attach_p != NULL) {
  553                         error = EEXIST;
  554                         break;
  555                 }
  556                 ng_gif_attach_p = ng_gif_attach;
  557                 ng_gif_detach_p = ng_gif_detach;
  558                 ng_gif_input_p = ng_gif_input;
  559                 ng_gif_input_orphan_p = ng_gif_input_orphan;
  560 
  561                 /* Create nodes for any already-existing gif interfaces */
  562                 IFNET_RLOCK();
  563                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
  564                         if (ifp->if_type == IFT_GIF)
  565                                 ng_gif_attach(ifp);
  566                 }
  567                 IFNET_RUNLOCK();
  568                 break;
  569 
  570         case MOD_UNLOAD:
  571 
  572                 /*
  573                  * Note that the base code won't try to unload us until
  574                  * all nodes have been removed, and that can't happen
  575                  * until all gif interfaces are destroyed. In any
  576                  * case, we know there are no nodes left if the action
  577                  * is MOD_UNLOAD, so there's no need to detach any nodes.
  578                  *
  579                  * XXX: what about manual unloads?!?
  580                  */
  581 
  582                 /* Unregister function hooks */
  583                 ng_gif_attach_p = NULL;
  584                 ng_gif_detach_p = NULL;
  585                 ng_gif_input_p = NULL;
  586                 ng_gif_input_orphan_p = NULL;
  587                 break;
  588 
  589         default:
  590                 error = EOPNOTSUPP;
  591                 break;
  592         }
  593         splx(s);
  594         return (error);
  595 }
  596 

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