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/10.2/sys/netgraph/ng_gif.c 243882 2012-12-05 08:04:20Z glebius $
   66  */
   67 
   68 /*
   69  * ng_gif(4) netgraph node type
   70  */
   71 #include <sys/param.h>
   72 #include <sys/systm.h>
   73 #include <sys/kernel.h>
   74 #include <sys/malloc.h>
   75 #include <sys/mbuf.h>
   76 #include <sys/errno.h>
   77 #include <sys/syslog.h>
   78 #include <sys/socket.h>
   79 
   80 #include <net/if.h>
   81 #include <net/route.h>
   82 #include <net/if_types.h>
   83 #include <net/if_var.h>
   84 #include <net/if_gif.h>
   85 #include <net/vnet.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 static void
  168 ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af)
  169 {
  170         const node_p node = IFP2NG(ifp);
  171         const priv_p priv = NG_NODE_PRIVATE(node);
  172 
  173         /* If "lower" hook not connected, let packet continue */
  174         if (priv->lower == NULL || priv->lowerOrphan)
  175                 return;
  176         ng_gif_input2(node, mp, af);
  177 }
  178 
  179 /*
  180  * Handle a packet that has come in on an interface, and which
  181  * does not match any of our known protocols (an ``orphan'').
  182  */
  183 static void
  184 ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af)
  185 {
  186         const node_p node = IFP2NG(ifp);
  187         const priv_p priv = NG_NODE_PRIVATE(node);
  188 
  189         /* If "orphan" hook not connected, let packet continue */
  190         if (priv->lower == NULL || !priv->lowerOrphan) {
  191                 m_freem(m);
  192                 return;
  193         }
  194         ng_gif_input2(node, &m, af);
  195         if (m != NULL)
  196                 m_freem(m);
  197 }
  198 
  199 /*
  200  * Handle a packet that has come in on a gif interface.
  201  * Attach the address family to the mbuf for later use.
  202  */
  203 static void
  204 ng_gif_input2(node_p node, struct mbuf **mp, int af)
  205 {
  206         const priv_p priv = NG_NODE_PRIVATE(node);
  207         int error;
  208 
  209         /* Glue address family on */
  210         if ((error = ng_gif_glue_af(mp, af)) != 0)
  211                 return;
  212 
  213         /* Send out lower/orphan hook */
  214         NG_SEND_DATA_ONLY(error, priv->lower, *mp);
  215         *mp = NULL;
  216 }
  217 
  218 /*
  219  * A new gif interface has been attached.
  220  * Create a new node for it, etc.
  221  */
  222 static void
  223 ng_gif_attach(struct ifnet *ifp)
  224 {
  225         priv_p priv;
  226         node_p node;
  227 
  228         /* Create node */
  229         KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
  230         if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) {
  231                 log(LOG_ERR, "%s: can't %s for %s\n",
  232                     __func__, "create node", ifp->if_xname);
  233                 return;
  234         }
  235 
  236         /* Allocate private data */
  237         priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  238         if (priv == NULL) {
  239                 log(LOG_ERR, "%s: can't %s for %s\n",
  240                     __func__, "allocate memory", ifp->if_xname);
  241                 NG_NODE_UNREF(node);
  242                 return;
  243         }
  244         NG_NODE_SET_PRIVATE(node, priv);
  245         priv->ifp = ifp;
  246         IFP2NG_SET(ifp, node);
  247 
  248         /* Try to give the node the same name as the interface */
  249         if (ng_name_node(node, ifp->if_xname) != 0) {
  250                 log(LOG_WARNING, "%s: can't name node %s\n",
  251                     __func__, ifp->if_xname);
  252         }
  253 }
  254 
  255 /*
  256  * An interface is being detached.
  257  * REALLY Destroy its node.
  258  */
  259 static void
  260 ng_gif_detach(struct ifnet *ifp)
  261 {
  262         const node_p node = IFP2NG(ifp);
  263         priv_p priv;
  264 
  265         if (node == NULL)               /* no node (why not?), ignore */
  266                 return;
  267         priv = NG_NODE_PRIVATE(node);
  268         NG_NODE_REALLY_DIE(node);       /* Force real removal of node */
  269         /*
  270          * We can't assume the ifnet is still around when we run shutdown
  271          * So zap it now. XXX We HOPE that anything running at this time
  272          * handles it (as it should in the non netgraph case).
  273          */
  274         IFP2NG_SET(ifp, NULL);
  275         priv->ifp = NULL;       /* XXX race if interrupted an output packet */
  276         ng_rmnode_self(node);           /* remove all netgraph parts */
  277 }
  278 
  279 /*
  280  * Optimization for gluing the address family onto
  281  * the front of an incoming packet.
  282  */
  283 static int
  284 ng_gif_glue_af(struct mbuf **mp, int af)
  285 {
  286         struct mbuf *m = *mp;
  287         int error = 0;
  288         sa_family_t tmp_af;
  289 
  290         tmp_af = (sa_family_t) af;
  291 
  292         /*
  293          * XXX: should try to bring back some of the optimizations from
  294          * ng_ether.c
  295          */
  296 
  297         /*
  298          * Doing anything more is likely to get more
  299          * expensive than it's worth..
  300          * it's probable that everything else is in one
  301          * big lump. The next node will do an m_pullup()
  302          * for exactly the amount of data it needs and
  303          * hopefully everything after that will not
  304          * need one. So let's just use M_PREPEND.
  305          */
  306         M_PREPEND(m, sizeof (tmp_af), M_NOWAIT);
  307         if (m == NULL) {
  308                 error = ENOBUFS;
  309                 goto done;
  310         }
  311 
  312 #if 0
  313 copy:
  314 #endif
  315         /* Copy header and return (possibly new) mbuf */
  316         *mtod(m, sa_family_t *) = tmp_af;
  317 #if 0
  318         bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af));
  319 #endif
  320 done:
  321         *mp = m;
  322         return error;
  323 }
  324 
  325 /******************************************************************
  326                     NETGRAPH NODE METHODS
  327 ******************************************************************/
  328 
  329 /*
  330  * It is not possible or allowable to create a node of this type.
  331  * Nodes get created when the interface is attached (or, when
  332  * this node type's KLD is loaded).
  333  */
  334 static int
  335 ng_gif_constructor(node_p node)
  336 {
  337         return (EINVAL);
  338 }
  339 
  340 /*
  341  * Check for attaching a new hook.
  342  */
  343 static  int
  344 ng_gif_newhook(node_p node, hook_p hook, const char *name)
  345 {
  346         const priv_p priv = NG_NODE_PRIVATE(node);
  347         u_char orphan = priv->lowerOrphan;
  348         hook_p *hookptr;
  349 
  350         /* Divert hook is an alias for lower */
  351         if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0)
  352                 name = NG_GIF_HOOK_LOWER;
  353 
  354         /* Which hook? */
  355         if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) {
  356                 hookptr = &priv->lower;
  357                 orphan = 0;
  358         } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) {
  359                 hookptr = &priv->lower;
  360                 orphan = 1;
  361         } else
  362                 return (EINVAL);
  363 
  364         /* Check if already connected (shouldn't be, but doesn't hurt) */
  365         if (*hookptr != NULL)
  366                 return (EISCONN);
  367 
  368         /* OK */
  369         *hookptr = hook;
  370         priv->lowerOrphan = orphan;
  371         return (0);
  372 }
  373 
  374 /*
  375  * Hooks are attached, adjust to force queueing.
  376  * We don't really care which hook it is.
  377  * they should all be queuing for outgoing data.
  378  */
  379 static  int
  380 ng_gif_connect(hook_p hook)
  381 {
  382         NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
  383         return (0);
  384 }
  385 
  386 /*
  387  * Receive an incoming control message.
  388  */
  389 static int
  390 ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook)
  391 {
  392         const priv_p priv = NG_NODE_PRIVATE(node);
  393         struct ng_mesg *resp = NULL;
  394         int error = 0;
  395         struct ng_mesg *msg;
  396 
  397         NGI_GET_MSG(item, msg);
  398         switch (msg->header.typecookie) {
  399         case NGM_GIF_COOKIE:
  400                 switch (msg->header.cmd) {
  401                 case NGM_GIF_GET_IFNAME:
  402                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  403                         if (resp == NULL) {
  404                                 error = ENOMEM;
  405                                 break;
  406                         }
  407                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
  408                         break;
  409                 case NGM_GIF_GET_IFINDEX:
  410                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  411                         if (resp == NULL) {
  412                                 error = ENOMEM;
  413                                 break;
  414                         }
  415                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
  416                         break;
  417                 default:
  418                         error = EINVAL;
  419                         break;
  420                 }
  421                 break;
  422         default:
  423                 error = EINVAL;
  424                 break;
  425         }
  426         NG_RESPOND_MSG(error, node, item, resp);
  427         NG_FREE_MSG(msg);
  428         return (error);
  429 }
  430 
  431 /*
  432  * Receive data on a hook.
  433  */
  434 static int
  435 ng_gif_rcvdata(hook_p hook, item_p item)
  436 {
  437         const node_p node = NG_HOOK_NODE(hook);
  438         const priv_p priv = NG_NODE_PRIVATE(node);
  439         struct mbuf *m;
  440 
  441         NGI_GET_M(item, m);
  442         NG_FREE_ITEM(item);
  443 
  444         if (hook == priv->lower)
  445                 return ng_gif_rcv_lower(node, m);
  446         panic("%s: weird hook", __func__);
  447 }
  448 
  449 /*
  450  * Handle an mbuf received on the "lower" hook.
  451  */
  452 static int
  453 ng_gif_rcv_lower(node_p node, struct mbuf *m)
  454 {
  455         struct sockaddr dst;
  456         const priv_p priv = NG_NODE_PRIVATE(node);
  457 
  458         bzero(&dst, sizeof(dst));
  459 
  460         /* Make sure header is fully pulled up */
  461         if (m->m_pkthdr.len < sizeof(sa_family_t)) {
  462                 NG_FREE_M(m);
  463                 return (EINVAL);
  464         }
  465         if (m->m_len < sizeof(sa_family_t)
  466             && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
  467                 return (ENOBUFS);
  468         }
  469 
  470         dst.sa_family = *mtod(m, sa_family_t *);
  471         m_adj(m, sizeof(sa_family_t));
  472 
  473         /* Send it on its way */
  474         /*
  475          * XXX: gif_output only uses dst for the family and passes the
  476          * fourth argument (rt) to in{,6}_gif_output which ignore it.
  477          * If this changes ng_gif will probably break.
  478          */
  479         return gif_output(priv->ifp, m, &dst, NULL);
  480 }
  481 
  482 /*
  483  * Shutdown node. This resets the node but does not remove it
  484  * unless the REALLY_DIE flag is set.
  485  */
  486 static int
  487 ng_gif_shutdown(node_p node)
  488 {
  489         const priv_p priv = NG_NODE_PRIVATE(node);
  490 
  491         if (node->nd_flags & NGF_REALLY_DIE) {
  492                 /*
  493                  * WE came here because the gif interface is being destroyed,
  494                  * so stop being persistant.
  495                  * Actually undo all the things we did on creation.
  496                  * Assume the ifp has already been freed.
  497                  */
  498                 NG_NODE_SET_PRIVATE(node, NULL);
  499                 free(priv, M_NETGRAPH);         
  500                 NG_NODE_UNREF(node);    /* free node itself */
  501                 return (0);
  502         }
  503         NG_NODE_REVIVE(node);           /* Signal ng_rmnode we are persisant */
  504         return (0);
  505 }
  506 
  507 /*
  508  * Hook disconnection.
  509  */
  510 static int
  511 ng_gif_disconnect(hook_p hook)
  512 {
  513         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  514 
  515         if (hook == priv->lower) {
  516                 priv->lower = NULL;
  517                 priv->lowerOrphan = 0;
  518         } else 
  519                 panic("%s: weird hook", __func__);
  520         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  521             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  522                 ng_rmnode_self(NG_HOOK_NODE(hook));     /* reset node */
  523 
  524         return (0);
  525 }
  526 
  527 /******************************************************************
  528                         INITIALIZATION
  529 ******************************************************************/
  530 
  531 /*
  532  * Handle loading and unloading for this node type.
  533  */
  534 static int
  535 ng_gif_mod_event(module_t mod, int event, void *data)
  536 {
  537         VNET_ITERATOR_DECL(vnet_iter);
  538         struct ifnet *ifp;
  539         int error = 0;
  540 
  541         switch (event) {
  542         case MOD_LOAD:
  543 
  544                 /* Register function hooks */
  545                 if (ng_gif_attach_p != NULL) {
  546                         error = EEXIST;
  547                         break;
  548                 }
  549                 ng_gif_attach_p = ng_gif_attach;
  550                 ng_gif_detach_p = ng_gif_detach;
  551                 ng_gif_input_p = ng_gif_input;
  552                 ng_gif_input_orphan_p = ng_gif_input_orphan;
  553 
  554                 /* Create nodes for any already-existing gif interfaces */
  555                 VNET_LIST_RLOCK();
  556                 IFNET_RLOCK();
  557                 VNET_FOREACH(vnet_iter) {
  558                         CURVNET_SET_QUIET(vnet_iter); /* XXX revisit quiet */
  559                         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
  560                                 if (ifp->if_type == IFT_GIF)
  561                                         ng_gif_attach(ifp);
  562                         }
  563                         CURVNET_RESTORE();
  564                 }
  565                 IFNET_RUNLOCK();
  566                 VNET_LIST_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         return (error);
  593 }
  594 

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