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  * Copyright 2001 The Aerospace Corporation.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions, and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions, and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of The Aerospace Corporation may not be used to endorse or
   16  *    promote products derived from this software.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  *
   31  * Copyright (c) 1996-2000 Whistle Communications, Inc.
   32  * All rights reserved.
   33  * 
   34  * Subject to the following obligations and disclaimer of warranty, use and
   35  * redistribution of this software, in source or object code forms, with or
   36  * without modifications are expressly permitted by Whistle Communications;
   37  * provided, however, that:
   38  * 1. Any and all reproductions of the source or object code must include the
   39  *    copyright notice above and the following disclaimer of warranties; and
   40  * 2. No rights are granted, in any manner or form, to use Whistle
   41  *    Communications, Inc. trademarks, including the mark "WHISTLE
   42  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   43  *    such appears in the above copyright notice or in the software.
   44  * 
   45  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   46  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   47  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   48  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   49  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   50  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   51  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   52  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   53  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   54  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   55  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   56  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   57  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   60  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   61  * OF SUCH DAMAGE.
   62  *
   63  * $FreeBSD: releng/5.3/sys/netgraph/ng_gif.c 136588 2004-10-16 08:43:07Z cvs2svn $
   64  */
   65 
   66 /*
   67  * ng_gif(4) netgraph node type
   68  */
   69 
   70 #include <sys/param.h>
   71 #include <sys/systm.h>
   72 #include <sys/kernel.h>
   73 #include <sys/malloc.h>
   74 #include <sys/mbuf.h>
   75 #include <sys/errno.h>
   76 #include <sys/syslog.h>
   77 #include <sys/socket.h>
   78 
   79 #include <net/if.h>
   80 #include <net/route.h>
   81 #include <net/if_types.h>
   82 #include <net/if_var.h>
   83 #include <net/if_gif.h>
   84 
   85 #include <netgraph/ng_message.h>
   86 #include <netgraph/netgraph.h>
   87 #include <netgraph/ng_parse.h>
   88 #include <netgraph/ng_gif.h>
   89 
   90 #define IFP2NG(ifp)  ((struct ng_node *)((struct gif_softc *)(ifp))->gif_netgraph)
   91 #define IFP2NG_SET(ifp, val)  (((struct gif_softc *)(ifp))->gif_netgraph = (val))
   92 
   93 /* Per-node private data */
   94 struct private {
   95         struct ifnet    *ifp;           /* associated interface */
   96         hook_p          lower;          /* lower OR orphan hook connection */
   97         u_char          lowerOrphan;    /* whether lower is lower or orphan */
   98 };
   99 typedef struct private *priv_p;
  100 
  101 /* Functional hooks called from if_gif.c */
  102 static void     ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af);
  103 static void     ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af);
  104 static void     ng_gif_attach(struct ifnet *ifp);
  105 static void     ng_gif_detach(struct ifnet *ifp); 
  106 
  107 /* Other functions */
  108 static void     ng_gif_input2(node_p node, struct mbuf **mp, int af);
  109 static int      ng_gif_glue_af(struct mbuf **mp, int af);
  110 static int      ng_gif_rcv_lower(node_p node, struct mbuf *m);
  111 
  112 /* Netgraph node methods */
  113 static ng_constructor_t ng_gif_constructor;
  114 static ng_rcvmsg_t      ng_gif_rcvmsg;
  115 static ng_shutdown_t    ng_gif_shutdown;
  116 static ng_newhook_t     ng_gif_newhook;
  117 static ng_connect_t     ng_gif_connect;
  118 static ng_rcvdata_t     ng_gif_rcvdata;
  119 static ng_disconnect_t  ng_gif_disconnect;
  120 static int              ng_gif_mod_event(module_t mod, int event, void *data);
  121 
  122 /* List of commands and how to convert arguments to/from ASCII */
  123 static const struct ng_cmdlist ng_gif_cmdlist[] = {
  124         {
  125           NGM_GIF_COOKIE,
  126           NGM_GIF_GET_IFNAME,
  127           "getifname",
  128           NULL,
  129           &ng_parse_string_type
  130         },
  131         {
  132           NGM_GIF_COOKIE,
  133           NGM_GIF_GET_IFINDEX,
  134           "getifindex",
  135           NULL,
  136           &ng_parse_int32_type
  137         },
  138         { 0 }
  139 };
  140 
  141 static struct ng_type ng_gif_typestruct = {
  142         .version =      NG_ABI_VERSION,
  143         .name =         NG_GIF_NODE_TYPE,
  144         .mod_event =    ng_gif_mod_event,
  145         .constructor =  ng_gif_constructor,
  146         .rcvmsg =       ng_gif_rcvmsg,
  147         .shutdown =     ng_gif_shutdown,
  148         .newhook =      ng_gif_newhook,
  149         .connect =      ng_gif_connect,
  150         .rcvdata =      ng_gif_rcvdata,
  151         .disconnect =   ng_gif_disconnect,
  152         .cmdlist =      ng_gif_cmdlist,
  153 };
  154 MODULE_VERSION(ng_gif, 1);
  155 MODULE_DEPEND(ng_gif, if_gif, 1,1,1);
  156 NETGRAPH_INIT(gif, &ng_gif_typestruct);
  157 
  158 /******************************************************************
  159                        GIF FUNCTION HOOKS
  160 ******************************************************************/
  161 
  162 /*
  163  * Handle a packet that has come in on an interface. We get to
  164  * look at it here before any upper layer protocols do.
  165  *
  166  * NOTE: this function will get called at splimp()
  167  */
  168 static void
  169 ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af)
  170 {
  171         const node_p node = IFP2NG(ifp);
  172         const priv_p priv = NG_NODE_PRIVATE(node);
  173 
  174         /* If "lower" hook not connected, let packet continue */
  175         if (priv->lower == NULL || priv->lowerOrphan)
  176                 return;
  177         ng_gif_input2(node, mp, af);
  178 }
  179 
  180 /*
  181  * Handle a packet that has come in on an interface, and which
  182  * does not match any of our known protocols (an ``orphan'').
  183  *
  184  * NOTE: this function will get called at splimp()
  185  */
  186 static void
  187 ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af)
  188 {
  189         const node_p node = IFP2NG(ifp);
  190         const priv_p priv = NG_NODE_PRIVATE(node);
  191 
  192         /* If "orphan" hook not connected, let packet continue */
  193         if (priv->lower == NULL || !priv->lowerOrphan) {
  194                 m_freem(m);
  195                 return;
  196         }
  197         ng_gif_input2(node, &m, af);
  198         if (m != NULL)
  199                 m_freem(m);
  200 }
  201 
  202 /*
  203  * Handle a packet that has come in on a gif interface.
  204  * Attach the address family to the mbuf for later use.
  205  *
  206  * NOTE: this function will get called at splimp()
  207  */
  208 static void
  209 ng_gif_input2(node_p node, struct mbuf **mp, int af)
  210 {
  211         const priv_p priv = NG_NODE_PRIVATE(node);
  212         int error;
  213 
  214         /* Glue address family on */
  215         if ((error = ng_gif_glue_af(mp, af)) != 0)
  216                 return;
  217 
  218         /* Send out lower/orphan hook */
  219         NG_SEND_DATA_ONLY(error, priv->lower, *mp);
  220         *mp = NULL;
  221 }
  222 
  223 /*
  224  * A new gif interface has been attached.
  225  * Create a new node for it, etc.
  226  */
  227 static void
  228 ng_gif_attach(struct ifnet *ifp)
  229 {
  230         priv_p priv;
  231         node_p node;
  232 
  233         /* Create node */
  234         KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
  235         if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) {
  236                 log(LOG_ERR, "%s: can't %s for %s\n",
  237                     __func__, "create node", ifp->if_xname);
  238                 return;
  239         }
  240 
  241         /* Allocate private data */
  242         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  243         if (priv == NULL) {
  244                 log(LOG_ERR, "%s: can't %s for %s\n",
  245                     __func__, "allocate memory", ifp->if_xname);
  246                 NG_NODE_UNREF(node);
  247                 return;
  248         }
  249         NG_NODE_SET_PRIVATE(node, priv);
  250         priv->ifp = ifp;
  251         IFP2NG_SET(ifp, node);
  252 
  253         /* Try to give the node the same name as the interface */
  254         if (ng_name_node(node, ifp->if_xname) != 0) {
  255                 log(LOG_WARNING, "%s: can't name node %s\n",
  256                     __func__, ifp->if_xname);
  257         }
  258 }
  259 
  260 /*
  261  * An interface is being detached.
  262  * REALLY Destroy its node.
  263  */
  264 static void
  265 ng_gif_detach(struct ifnet *ifp)
  266 {
  267         const node_p node = IFP2NG(ifp);
  268         priv_p priv;
  269 
  270         if (node == NULL)               /* no node (why not?), ignore */
  271                 return;
  272         priv = NG_NODE_PRIVATE(node);
  273         NG_NODE_REALLY_DIE(node);       /* Force real removal of node */
  274         /*
  275          * We can't assume the ifnet is still around when we run shutdown
  276          * So zap it now. XXX We HOPE that anything running at this time
  277          * handles it (as it should in the non netgraph case).
  278          */
  279         IFP2NG_SET(ifp, NULL);
  280         priv->ifp = NULL;       /* XXX race if interrupted an output packet */
  281         ng_rmnode_self(node);           /* remove all netgraph parts */
  282 }
  283 
  284 /*
  285  * Optimization for gluing the address family onto
  286  * the front of an incoming packet.
  287  */
  288 static int
  289 ng_gif_glue_af(struct mbuf **mp, int af)
  290 {
  291         struct mbuf *m = *mp;
  292         int error = 0;
  293         sa_family_t tmp_af;
  294 
  295         tmp_af = (sa_family_t) af;
  296 
  297         /*
  298          * XXX: should try to bring back some of the optimizations from
  299          * ng_ether.c
  300          */
  301 
  302         /*
  303          * Doing anything more is likely to get more
  304          * expensive than it's worth..
  305          * it's probable that everything else is in one
  306          * big lump. The next node will do an m_pullup()
  307          * for exactly the amount of data it needs and
  308          * hopefully everything after that will not
  309          * need one. So let's just use M_PREPEND.
  310          */
  311         M_PREPEND(m, sizeof (tmp_af), M_DONTWAIT);
  312         if (m == NULL) {
  313                 error = ENOBUFS;
  314                 goto done;
  315         }
  316 
  317 #if 0
  318 copy:
  319 #endif
  320         /* Copy header and return (possibly new) mbuf */
  321         *mtod(m, sa_family_t *) = tmp_af;
  322 #if 0
  323         bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af));
  324 #endif
  325 done:
  326         *mp = m;
  327         return error;
  328 }
  329 
  330 /******************************************************************
  331                     NETGRAPH NODE METHODS
  332 ******************************************************************/
  333 
  334 /*
  335  * It is not possible or allowable to create a node of this type.
  336  * Nodes get created when the interface is attached (or, when
  337  * this node type's KLD is loaded).
  338  */
  339 static int
  340 ng_gif_constructor(node_p node)
  341 {
  342         return (EINVAL);
  343 }
  344 
  345 /*
  346  * Check for attaching a new hook.
  347  */
  348 static  int
  349 ng_gif_newhook(node_p node, hook_p hook, const char *name)
  350 {
  351         const priv_p priv = NG_NODE_PRIVATE(node);
  352         u_char orphan = priv->lowerOrphan;
  353         hook_p *hookptr;
  354 
  355         /* Divert hook is an alias for lower */
  356         if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0)
  357                 name = NG_GIF_HOOK_LOWER;
  358 
  359         /* Which hook? */
  360         if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) {
  361                 hookptr = &priv->lower;
  362                 orphan = 0;
  363         } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) {
  364                 hookptr = &priv->lower;
  365                 orphan = 1;
  366         } else
  367                 return (EINVAL);
  368 
  369         /* Check if already connected (shouldn't be, but doesn't hurt) */
  370         if (*hookptr != NULL)
  371                 return (EISCONN);
  372 
  373         /* OK */
  374         *hookptr = hook;
  375         priv->lowerOrphan = orphan;
  376         return (0);
  377 }
  378 
  379 /*
  380  * Hooks are attached, adjust to force queueing.
  381  * We don't really care which hook it is.
  382  * they should all be queuing for outgoing data.
  383  */
  384 static  int
  385 ng_gif_connect(hook_p hook)
  386 {
  387         NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
  388         return (0);
  389 }
  390 
  391 /*
  392  * Receive an incoming control message.
  393  */
  394 static int
  395 ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook)
  396 {
  397         const priv_p priv = NG_NODE_PRIVATE(node);
  398         struct ng_mesg *resp = NULL;
  399         int error = 0;
  400         struct ng_mesg *msg;
  401 
  402         NGI_GET_MSG(item, msg);
  403         switch (msg->header.typecookie) {
  404         case NGM_GIF_COOKIE:
  405                 switch (msg->header.cmd) {
  406                 case NGM_GIF_GET_IFNAME:
  407                         NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
  408                         if (resp == NULL) {
  409                                 error = ENOMEM;
  410                                 break;
  411                         }
  412                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1);
  413                         break;
  414                 case NGM_GIF_GET_IFINDEX:
  415                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  416                         if (resp == NULL) {
  417                                 error = ENOMEM;
  418                                 break;
  419                         }
  420                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
  421                         break;
  422                 default:
  423                         error = EINVAL;
  424                         break;
  425                 }
  426                 break;
  427         default:
  428                 error = EINVAL;
  429                 break;
  430         }
  431         NG_RESPOND_MSG(error, node, item, resp);
  432         NG_FREE_MSG(msg);
  433         return (error);
  434 }
  435 
  436 /*
  437  * Receive data on a hook.
  438  */
  439 static int
  440 ng_gif_rcvdata(hook_p hook, item_p item)
  441 {
  442         const node_p node = NG_HOOK_NODE(hook);
  443         const priv_p priv = NG_NODE_PRIVATE(node);
  444         struct mbuf *m;
  445 
  446         NGI_GET_M(item, m);
  447         NG_FREE_ITEM(item);
  448 
  449         if (hook == priv->lower)
  450                 return ng_gif_rcv_lower(node, m);
  451         panic("%s: weird hook", __func__);
  452 }
  453 
  454 /*
  455  * Handle an mbuf received on the "lower" hook.
  456  */
  457 static int
  458 ng_gif_rcv_lower(node_p node, struct mbuf *m)
  459 {
  460         struct sockaddr dst;
  461         const priv_p priv = NG_NODE_PRIVATE(node);
  462 
  463         bzero(&dst, sizeof(dst));
  464 
  465         /* Make sure header is fully pulled up */
  466         if (m->m_pkthdr.len < sizeof(sa_family_t)) {
  467                 NG_FREE_M(m);
  468                 return (EINVAL);
  469         }
  470         if (m->m_len < sizeof(sa_family_t)
  471             && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
  472                 return (ENOBUFS);
  473         }
  474 
  475         dst.sa_family = *mtod(m, sa_family_t *);
  476         m_adj(m, sizeof(sa_family_t));
  477 
  478         /* Send it on its way */
  479         /*
  480          * XXX: gif_output only uses dst for the family and passes the
  481          * fourth argument (rt) to in{,6}_gif_output which ignore it.
  482          * If this changes ng_gif will probably break.
  483          */
  484         return gif_output(priv->ifp, m, &dst, NULL);
  485 }
  486 
  487 /*
  488  * Shutdown node. This resets the node but does not remove it
  489  * unless the REALLY_DIE flag is set.
  490  */
  491 static int
  492 ng_gif_shutdown(node_p node)
  493 {
  494         const priv_p priv = NG_NODE_PRIVATE(node);
  495 
  496         if (node->nd_flags & NGF_REALLY_DIE) {
  497                 /*
  498                  * WE came here because the gif interface is being destroyed,
  499                  * so stop being persistant.
  500                  * Actually undo all the things we did on creation.
  501                  * Assume the ifp has already been freed.
  502                  */
  503                 NG_NODE_SET_PRIVATE(node, NULL);
  504                 FREE(priv, M_NETGRAPH);         
  505                 NG_NODE_UNREF(node);    /* free node itself */
  506                 return (0);
  507         }
  508         NG_NODE_REVIVE(node);           /* Signal ng_rmnode we are persisant */
  509         return (0);
  510 }
  511 
  512 /*
  513  * Hook disconnection.
  514  */
  515 static int
  516 ng_gif_disconnect(hook_p hook)
  517 {
  518         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  519 
  520         if (hook == priv->lower) {
  521                 priv->lower = NULL;
  522                 priv->lowerOrphan = 0;
  523         } else 
  524                 panic("%s: weird hook", __func__);
  525         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  526             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  527                 ng_rmnode_self(NG_HOOK_NODE(hook));     /* reset node */
  528 
  529         return (0);
  530 }
  531 
  532 /******************************************************************
  533                         INITIALIZATION
  534 ******************************************************************/
  535 
  536 /*
  537  * Handle loading and unloading for this node type.
  538  */
  539 static int
  540 ng_gif_mod_event(module_t mod, int event, void *data)
  541 {
  542         struct ifnet *ifp;
  543         int error = 0;
  544         int s;
  545 
  546         s = splnet();
  547         switch (event) {
  548         case MOD_LOAD:
  549 
  550                 /* Register function hooks */
  551                 if (ng_gif_attach_p != NULL) {
  552                         error = EEXIST;
  553                         break;
  554                 }
  555                 ng_gif_attach_p = ng_gif_attach;
  556                 ng_gif_detach_p = ng_gif_detach;
  557                 ng_gif_input_p = ng_gif_input;
  558                 ng_gif_input_orphan_p = ng_gif_input_orphan;
  559 
  560                 /* Create nodes for any already-existing gif interfaces */
  561                 IFNET_RLOCK();
  562                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
  563                         if (ifp->if_type == IFT_GIF)
  564                                 ng_gif_attach(ifp);
  565                 }
  566                 IFNET_RUNLOCK();
  567                 break;
  568 
  569         case MOD_UNLOAD:
  570 
  571                 /*
  572                  * Note that the base code won't try to unload us until
  573                  * all nodes have been removed, and that can't happen
  574                  * until all gif interfaces are destroyed. In any
  575                  * case, we know there are no nodes left if the action
  576                  * is MOD_UNLOAD, so there's no need to detach any nodes.
  577                  *
  578                  * XXX: what about manual unloads?!?
  579                  */
  580 
  581                 /* Unregister function hooks */
  582                 ng_gif_attach_p = NULL;
  583                 ng_gif_detach_p = NULL;
  584                 ng_gif_input_p = NULL;
  585                 ng_gif_input_orphan_p = NULL;
  586                 break;
  587 
  588         default:
  589                 error = EOPNOTSUPP;
  590                 break;
  591         }
  592         splx(s);
  593         return (error);
  594 }
  595 

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