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/5.2/sys/netgraph/ng_gif.c 121816 2003-10-31 18:32:15Z brooks $
   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 
   92 /* Per-node private data */
   93 struct private {
   94         struct ifnet    *ifp;           /* associated interface */
   95         hook_p          lower;          /* lower OR orphan hook connection */
   96         u_char          lowerOrphan;    /* whether lower is lower or orphan */
   97 };
   98 typedef struct private *priv_p;
   99 
  100 /* Functional hooks called from if_gif.c */
  101 static void     ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af);
  102 static void     ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af);
  103 static void     ng_gif_attach(struct ifnet *ifp);
  104 static void     ng_gif_detach(struct ifnet *ifp); 
  105 
  106 /* Other functions */
  107 static void     ng_gif_input2(node_p node, struct mbuf **mp, int af);
  108 static int      ng_gif_glue_af(struct mbuf **mp, int af);
  109 static int      ng_gif_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
  110 
  111 /* Netgraph node methods */
  112 static ng_constructor_t ng_gif_constructor;
  113 static ng_rcvmsg_t      ng_gif_rcvmsg;
  114 static ng_shutdown_t    ng_gif_shutdown;
  115 static ng_newhook_t     ng_gif_newhook;
  116 static ng_connect_t     ng_gif_connect;
  117 static ng_rcvdata_t     ng_gif_rcvdata;
  118 static ng_disconnect_t  ng_gif_disconnect;
  119 static int              ng_gif_mod_event(module_t mod, int event, void *data);
  120 
  121 /* List of commands and how to convert arguments to/from ASCII */
  122 static const struct ng_cmdlist ng_gif_cmdlist[] = {
  123         {
  124           NGM_GIF_COOKIE,
  125           NGM_GIF_GET_IFNAME,
  126           "getifname",
  127           NULL,
  128           &ng_parse_string_type
  129         },
  130         {
  131           NGM_GIF_COOKIE,
  132           NGM_GIF_GET_IFINDEX,
  133           "getifindex",
  134           NULL,
  135           &ng_parse_int32_type
  136         },
  137         { 0 }
  138 };
  139 
  140 static struct ng_type ng_gif_typestruct = {
  141         NG_ABI_VERSION,
  142         NG_GIF_NODE_TYPE,
  143         ng_gif_mod_event,
  144         ng_gif_constructor,
  145         ng_gif_rcvmsg,
  146         ng_gif_shutdown,
  147         ng_gif_newhook,
  148         NULL,
  149         ng_gif_connect,
  150         ng_gif_rcvdata,
  151         ng_gif_disconnect,
  152         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(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         const priv_p priv = NG_NODE_PRIVATE(node);
  269 
  270         if (node == NULL)               /* no node (why not?), ignore */
  271                 return;
  272         NG_NODE_REALLY_DIE(node);       /* Force real removal of node */
  273         /*
  274          * We can't assume the ifnet is still around when we run shutdown
  275          * So zap it now. XXX We HOPE that anything running at this time
  276          * handles it (as it should in the non netgraph case).
  277          */
  278         IFP2NG(ifp) = NULL;
  279         priv->ifp = NULL;       /* XXX race if interrupted an output packet */
  280         ng_rmnode_self(node);           /* remove all netgraph parts */
  281 }
  282 
  283 /*
  284  * Optimization for gluing the address family onto
  285  * the front of an incoming packet.
  286  */
  287 static int
  288 ng_gif_glue_af(struct mbuf **mp, int af)
  289 {
  290         struct mbuf *m = *mp;
  291         int error = 0;
  292         sa_family_t tmp_af;
  293 
  294         tmp_af = (sa_family_t) af;
  295 
  296         /*
  297          * XXX: should try to bring back some of the optimizations from
  298          * ng_ether.c
  299          */
  300 
  301         /*
  302          * Doing anything more is likely to get more
  303          * expensive than it's worth..
  304          * it's probable that everything else is in one
  305          * big lump. The next node will do an m_pullup()
  306          * for exactly the amount of data it needs and
  307          * hopefully everything after that will not
  308          * need one. So let's just use M_PREPEND.
  309          */
  310         M_PREPEND(m, sizeof (tmp_af), M_DONTWAIT);
  311         if (m == NULL) {
  312                 error = ENOBUFS;
  313                 goto done;
  314         }
  315 
  316 #if 0
  317 copy:
  318 #endif
  319         /* Copy header and return (possibly new) mbuf */
  320         *mtod(m, sa_family_t *) = tmp_af;
  321 #if 0
  322         bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af));
  323 #endif
  324 done:
  325         *mp = m;
  326         return error;
  327 }
  328 
  329 /******************************************************************
  330                     NETGRAPH NODE METHODS
  331 ******************************************************************/
  332 
  333 /*
  334  * It is not possible or allowable to create a node of this type.
  335  * Nodes get created when the interface is attached (or, when
  336  * this node type's KLD is loaded).
  337  */
  338 static int
  339 ng_gif_constructor(node_p node)
  340 {
  341         return (EINVAL);
  342 }
  343 
  344 /*
  345  * Check for attaching a new hook.
  346  */
  347 static  int
  348 ng_gif_newhook(node_p node, hook_p hook, const char *name)
  349 {
  350         const priv_p priv = NG_NODE_PRIVATE(node);
  351         u_char orphan = priv->lowerOrphan;
  352         hook_p *hookptr;
  353 
  354         /* Divert hook is an alias for lower */
  355         if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0)
  356                 name = NG_GIF_HOOK_LOWER;
  357 
  358         /* Which hook? */
  359         if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) {
  360                 hookptr = &priv->lower;
  361                 orphan = 0;
  362         } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) {
  363                 hookptr = &priv->lower;
  364                 orphan = 1;
  365         } else
  366                 return (EINVAL);
  367 
  368         /* Check if already connected (shouldn't be, but doesn't hurt) */
  369         if (*hookptr != NULL)
  370                 return (EISCONN);
  371 
  372         /* OK */
  373         *hookptr = hook;
  374         priv->lowerOrphan = orphan;
  375         return (0);
  376 }
  377 
  378 /*
  379  * Hooks are attached, adjust to force queueing.
  380  * We don't really care which hook it is.
  381  * they should all be queuing for outgoing data.
  382  */
  383 static  int
  384 ng_gif_connect(hook_p hook)
  385 {
  386         NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
  387         return (0);
  388 }
  389 
  390 /*
  391  * Receive an incoming control message.
  392  */
  393 static int
  394 ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook)
  395 {
  396         const priv_p priv = NG_NODE_PRIVATE(node);
  397         struct ng_mesg *resp = NULL;
  398         int error = 0;
  399         struct ng_mesg *msg;
  400 
  401         NGI_GET_MSG(item, msg);
  402         switch (msg->header.typecookie) {
  403         case NGM_GIF_COOKIE:
  404                 switch (msg->header.cmd) {
  405                 case NGM_GIF_GET_IFNAME:
  406                         NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
  407                         if (resp == NULL) {
  408                                 error = ENOMEM;
  409                                 break;
  410                         }
  411                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1);
  412                         break;
  413                 case NGM_GIF_GET_IFINDEX:
  414                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  415                         if (resp == NULL) {
  416                                 error = ENOMEM;
  417                                 break;
  418                         }
  419                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
  420                         break;
  421                 default:
  422                         error = EINVAL;
  423                         break;
  424                 }
  425                 break;
  426         default:
  427                 error = EINVAL;
  428                 break;
  429         }
  430         NG_RESPOND_MSG(error, node, item, resp);
  431         NG_FREE_MSG(msg);
  432         return (error);
  433 }
  434 
  435 /*
  436  * Receive data on a hook.
  437  */
  438 static int
  439 ng_gif_rcvdata(hook_p hook, item_p item)
  440 {
  441         const node_p node = NG_HOOK_NODE(hook);
  442         const priv_p priv = NG_NODE_PRIVATE(node);
  443         struct mbuf *m;
  444         meta_p meta;
  445 
  446         NGI_GET_M(item, m);
  447         NGI_GET_META(item, meta);
  448         NG_FREE_ITEM(item);
  449         if (hook == priv->lower)
  450                 return ng_gif_rcv_lower(node, m, meta);
  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, meta_p meta)
  459 {
  460         struct sockaddr dst;
  461         const priv_p priv = NG_NODE_PRIVATE(node);
  462 
  463         bzero(&dst, sizeof(dst));
  464 
  465         /* We don't process metadata. */
  466         NG_FREE_META(meta);
  467 
  468         /* Make sure header is fully pulled up */
  469         if (m->m_pkthdr.len < sizeof(sa_family_t)) {
  470                 NG_FREE_M(m);
  471                 return (EINVAL);
  472         }
  473         if (m->m_len < sizeof(sa_family_t)
  474             && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
  475                 return (ENOBUFS);
  476         }
  477 
  478         dst.sa_family = *mtod(m, sa_family_t *);
  479         m_adj(m, sizeof(sa_family_t));
  480 
  481         /* Send it on its way */
  482         /*
  483          * XXX: gif_output only uses dst for the family and passes the
  484          * fourth argument (rt) to in{,6}_gif_output which ignore it.
  485          * If this changes ng_gif will probably break.
  486          */
  487         return gif_output(priv->ifp, m, &dst, NULL);
  488 }
  489 
  490 /*
  491  * Shutdown node. This resets the node but does not remove it
  492  * unless the REALLY_DIE flag is set.
  493  */
  494 static int
  495 ng_gif_shutdown(node_p node)
  496 {
  497         const priv_p priv = NG_NODE_PRIVATE(node);
  498 
  499         if (node->nd_flags & NG_REALLY_DIE) {
  500                 /*
  501                  * WE came here because the gif interface is being destroyed,
  502                  * so stop being persistant.
  503                  * Actually undo all the things we did on creation.
  504                  * Assume the ifp has already been freed.
  505                  */
  506                 NG_NODE_SET_PRIVATE(node, NULL);
  507                 FREE(priv, M_NETGRAPH);         
  508                 NG_NODE_UNREF(node);    /* free node itself */
  509                 return (0);
  510         }
  511         node->nd_flags &= ~NG_INVALID;  /* Signal ng_rmnode we are persisant */
  512         return (0);
  513 }
  514 
  515 /*
  516  * Hook disconnection.
  517  */
  518 static int
  519 ng_gif_disconnect(hook_p hook)
  520 {
  521         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  522 
  523         if (hook == priv->lower) {
  524                 priv->lower = NULL;
  525                 priv->lowerOrphan = 0;
  526         } else 
  527                 panic("%s: weird hook", __func__);
  528         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  529             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  530                 ng_rmnode_self(NG_HOOK_NODE(hook));     /* reset node */
  531 
  532         return (0);
  533 }
  534 
  535 /******************************************************************
  536                         INITIALIZATION
  537 ******************************************************************/
  538 
  539 /*
  540  * Handle loading and unloading for this node type.
  541  */
  542 static int
  543 ng_gif_mod_event(module_t mod, int event, void *data)
  544 {
  545         struct ifnet *ifp;
  546         int error = 0;
  547         int s;
  548 
  549         s = splnet();
  550         switch (event) {
  551         case MOD_LOAD:
  552 
  553                 /* Register function hooks */
  554                 if (ng_gif_attach_p != NULL) {
  555                         error = EEXIST;
  556                         break;
  557                 }
  558                 ng_gif_attach_p = ng_gif_attach;
  559                 ng_gif_detach_p = ng_gif_detach;
  560                 ng_gif_input_p = ng_gif_input;
  561                 ng_gif_input_orphan_p = ng_gif_input_orphan;
  562 
  563                 /* Create nodes for any already-existing gif interfaces */
  564                 IFNET_RLOCK();
  565                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
  566                         if (ifp->if_type == IFT_GIF)
  567                                 ng_gif_attach(ifp);
  568                 }
  569                 IFNET_RUNLOCK();
  570                 break;
  571 
  572         case MOD_UNLOAD:
  573 
  574                 /*
  575                  * Note that the base code won't try to unload us until
  576                  * all nodes have been removed, and that can't happen
  577                  * until all gif interfaces are destroyed. In any
  578                  * case, we know there are no nodes left if the action
  579                  * is MOD_UNLOAD, so there's no need to detach any nodes.
  580                  *
  581                  * XXX: what about manual unloads?!?
  582                  */
  583 
  584                 /* Unregister function hooks */
  585                 ng_gif_attach_p = NULL;
  586                 ng_gif_detach_p = NULL;
  587                 ng_gif_input_p = NULL;
  588                 ng_gif_input_orphan_p = NULL;
  589                 break;
  590 
  591         default:
  592                 error = EOPNOTSUPP;
  593                 break;
  594         }
  595         splx(s);
  596         return (error);
  597 }
  598 

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