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

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    1 /*
    2  * ng_gif_demux.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) 1996-1999 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/11.1/sys/netgraph/ng_gif_demux.c 298813 2016-04-29 21:25:05Z pfg $
   66  */
   67 
   68 /*
   69  * ng_gif_demux(4) netgraph node type
   70  *
   71  * Packets received on the "gif" hook have their type header removed
   72  * and are passed to the appropriate hook protocol hook.  Packets
   73  * received on a protocol hook have a type header added back and are
   74  * passed out the gif hook. The currently supported protocol hooks are:
   75  */
   76 
   77 #include <sys/param.h>
   78 #include <sys/systm.h>
   79 #include <sys/kernel.h>
   80 #include <sys/malloc.h>
   81 #include <sys/ctype.h>
   82 #include <sys/mbuf.h>
   83 #include <sys/errno.h>
   84 #include <sys/socket.h>
   85 
   86 #include <netgraph/ng_message.h>
   87 #include <netgraph/netgraph.h>
   88 #include <netgraph/ng_parse.h>
   89 #include <netgraph/ng_gif_demux.h>
   90 
   91 #ifdef NG_SEPARATE_MALLOC
   92 static MALLOC_DEFINE(M_NETGRAPH_GIF_DEMUX, "netgraph_gif_demux",
   93     "netgraph gif demux node");
   94 #else
   95 #define M_NETGRAPH_GIF_DEMUX M_NETGRAPH
   96 #endif
   97 
   98 /* This struct describes one address family */
   99 struct iffam {
  100         sa_family_t     family;         /* Address family */
  101         const char      *hookname;      /* Name for hook */
  102 };
  103 typedef const struct iffam *iffam_p;
  104 
  105 /* List of address families supported by our interface */
  106 const static struct iffam gFamilies[] = {
  107         { AF_INET,      NG_GIF_DEMUX_HOOK_INET  },
  108         { AF_INET6,     NG_GIF_DEMUX_HOOK_INET6 },
  109         { AF_APPLETALK, NG_GIF_DEMUX_HOOK_ATALK },
  110         { AF_IPX,       NG_GIF_DEMUX_HOOK_IPX   },
  111         { AF_ATM,       NG_GIF_DEMUX_HOOK_ATM   },
  112         { AF_NATM,      NG_GIF_DEMUX_HOOK_NATM  },
  113 };
  114 #define NUM_FAMILIES            nitems(gFamilies)
  115 
  116 /* Per-node private data */
  117 struct ng_gif_demux_private {
  118         node_p  node;                   /* Our netgraph node */
  119         hook_p  gif;                    /* The gif hook */
  120         hook_p  hooks[NUM_FAMILIES];    /* The protocol hooks */
  121 };
  122 typedef struct ng_gif_demux_private *priv_p;
  123 
  124 /* Netgraph node methods */
  125 static ng_constructor_t ng_gif_demux_constructor;
  126 static ng_rcvmsg_t      ng_gif_demux_rcvmsg;
  127 static ng_shutdown_t    ng_gif_demux_shutdown;
  128 static ng_newhook_t     ng_gif_demux_newhook;
  129 static ng_rcvdata_t     ng_gif_demux_rcvdata;
  130 static ng_disconnect_t  ng_gif_demux_disconnect;
  131 
  132 /* Helper stuff */
  133 static iffam_p  get_iffam_from_af(sa_family_t family);
  134 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
  135 static iffam_p  get_iffam_from_name(const char *name);
  136 static hook_p   *get_hook_from_iffam(priv_p priv, iffam_p iffam);
  137 
  138 /******************************************************************
  139                     NETGRAPH PARSE TYPES
  140 ******************************************************************/
  141 
  142 /* List of commands and how to convert arguments to/from ASCII */
  143 static const struct ng_cmdlist ng_gif_demux_cmdlist[] = {
  144         { 0 }
  145 };
  146 
  147 /* Node type descriptor */
  148 static struct ng_type ng_gif_demux_typestruct = {
  149         .version =      NG_ABI_VERSION,
  150         .name =         NG_GIF_DEMUX_NODE_TYPE,
  151         .constructor =  ng_gif_demux_constructor,
  152         .rcvmsg =       ng_gif_demux_rcvmsg,
  153         .shutdown =     ng_gif_demux_shutdown,
  154         .newhook =      ng_gif_demux_newhook,
  155         .rcvdata =      ng_gif_demux_rcvdata,
  156         .disconnect =   ng_gif_demux_disconnect,
  157         .cmdlist =      ng_gif_demux_cmdlist,
  158 };
  159 NETGRAPH_INIT(gif_demux, &ng_gif_demux_typestruct);
  160 
  161 /************************************************************************
  162                     HELPER STUFF
  163  ************************************************************************/
  164 
  165 /*
  166  * Get the family descriptor from the family ID
  167  */
  168 static __inline iffam_p
  169 get_iffam_from_af(sa_family_t family)
  170 {
  171         iffam_p iffam;
  172         int k;
  173 
  174         for (k = 0; k < NUM_FAMILIES; k++) {
  175                 iffam = &gFamilies[k];
  176                 if (iffam->family == family)
  177                         return (iffam);
  178         }
  179         return (NULL);
  180 }
  181 
  182 /*
  183  * Get the family descriptor from the hook
  184  */
  185 static __inline iffam_p
  186 get_iffam_from_hook(priv_p priv, hook_p hook)
  187 {
  188         int k;
  189 
  190         for (k = 0; k < NUM_FAMILIES; k++)
  191                 if (priv->hooks[k] == hook)
  192                         return (&gFamilies[k]);
  193         return (NULL);
  194 }
  195 
  196 /*
  197  * Get the hook from the iffam descriptor
  198  */
  199 
  200 static __inline hook_p *
  201 get_hook_from_iffam(priv_p priv, iffam_p iffam)
  202 {
  203         return (&priv->hooks[iffam - gFamilies]);
  204 }
  205 
  206 /*
  207  * Get the iffam descriptor from the name
  208  */
  209 static __inline iffam_p
  210 get_iffam_from_name(const char *name)
  211 {
  212         iffam_p iffam;
  213         int k;
  214 
  215         for (k = 0; k < NUM_FAMILIES; k++) {
  216                 iffam = &gFamilies[k];
  217                 if (!strcmp(iffam->hookname, name))
  218                         return (iffam);
  219         }
  220         return (NULL);
  221 }
  222 
  223 /******************************************************************
  224                     NETGRAPH NODE METHODS
  225 ******************************************************************/
  226 
  227 /*
  228  * Node constructor
  229  */
  230 static int
  231 ng_gif_demux_constructor(node_p node)
  232 {
  233         priv_p priv;
  234 
  235         /* Allocate and initialize private info */
  236         priv = malloc(sizeof(*priv), M_NETGRAPH_GIF_DEMUX, M_WAITOK | M_ZERO);
  237         priv->node = node;
  238 
  239         NG_NODE_SET_PRIVATE(node, priv);
  240 
  241         /* Done */
  242         return (0);
  243 }
  244 
  245 /*
  246  * Method for attaching a new hook
  247  */
  248 static  int
  249 ng_gif_demux_newhook(node_p node, hook_p hook, const char *name)
  250 {
  251         const priv_p priv = NG_NODE_PRIVATE(node);
  252         iffam_p iffam;
  253         hook_p *hookptr;
  254 
  255         if (strcmp(NG_GIF_DEMUX_HOOK_GIF, name) == 0)
  256                 hookptr = &priv->gif;
  257         else {
  258                 iffam = get_iffam_from_name(name);
  259                 if (iffam == NULL)
  260                         return (EPFNOSUPPORT);
  261                 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
  262         }
  263         if (*hookptr != NULL)
  264                 return (EISCONN);
  265         *hookptr = hook;
  266         return (0);
  267 }
  268 
  269 /*
  270  * Receive a control message
  271  */
  272 static int
  273 ng_gif_demux_rcvmsg(node_p node, item_p item, hook_p lasthook)
  274 {
  275         struct ng_mesg *resp = NULL;
  276         int error = 0;
  277         struct ng_mesg *msg;
  278 
  279         NGI_GET_MSG(item, msg);
  280         switch (msg->header.typecookie) {
  281         case NGM_GIF_DEMUX_COOKIE:
  282                 switch (msg->header.cmd) {
  283                 /* XXX: Add commands here. */
  284                 default:
  285                         error = EINVAL;
  286                         break;
  287                 }
  288                 break;
  289         default:
  290                 error = EINVAL;
  291                 break;
  292         }
  293 
  294         /* Done */
  295         NG_RESPOND_MSG(error, node, item, resp);
  296         NG_FREE_MSG(msg);
  297         return (error);
  298 }
  299 
  300 /*
  301  * Receive data on a hook
  302  */
  303 static int
  304 ng_gif_demux_rcvdata(hook_p hook, item_p item)
  305 {
  306         const node_p node = NG_HOOK_NODE(hook);
  307         const priv_p priv = NG_NODE_PRIVATE(node);
  308         iffam_p iffam;
  309         hook_p outhook;
  310         int error = 0;
  311         struct mbuf *m;
  312 
  313         /* Pull the mbuf out of the item for processing. */
  314         NGI_GET_M(item, m);
  315 
  316         if (hook == priv->gif) {
  317                 /*
  318                  * Pull off the address family header and find the
  319                  * output hook.
  320                  */
  321                 if (m->m_pkthdr.len < sizeof(sa_family_t)) {
  322                         NG_FREE_M(m);
  323                         NG_FREE_ITEM(item);
  324                         return (EINVAL);
  325                 }
  326                 if (m->m_len < sizeof(sa_family_t)
  327                     && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
  328                         NG_FREE_ITEM(item);
  329                         return (ENOBUFS);
  330                 }
  331                 iffam = get_iffam_from_af(*mtod(m, sa_family_t *));
  332                 if (iffam == NULL) {
  333                         NG_FREE_M(m);
  334                         NG_FREE_ITEM(item);
  335                         return (EINVAL);
  336                 }
  337                 outhook = *get_hook_from_iffam(priv, iffam);
  338                 m_adj(m, sizeof(sa_family_t));
  339         } else {
  340                 /*
  341                  * Add address family header and set the output hook.
  342                  */
  343                 iffam = get_iffam_from_hook(priv, hook);
  344                 M_PREPEND(m, sizeof (iffam->family), M_NOWAIT);
  345                 if (m == NULL) {
  346                         NG_FREE_M(m);
  347                         NG_FREE_ITEM(item);
  348                         return (ENOBUFS);
  349                 }
  350                 bcopy(&iffam->family, mtod(m, sa_family_t *),
  351                     sizeof(iffam->family));
  352                 outhook = priv->gif;
  353         }
  354 
  355         /* Stuff the mbuf back in. */
  356         NGI_M(item) = m;
  357 
  358         /* Deliver packet */
  359         NG_FWD_ITEM_HOOK(error, item, outhook);
  360         return (error);
  361 }
  362 
  363 /*
  364  * Shutdown node
  365  */
  366 static int
  367 ng_gif_demux_shutdown(node_p node)
  368 {
  369         const priv_p priv = NG_NODE_PRIVATE(node);
  370 
  371         free(priv, M_NETGRAPH_GIF_DEMUX);
  372         NG_NODE_SET_PRIVATE(node, NULL);
  373         NG_NODE_UNREF(node);
  374         return (0);
  375 }
  376 
  377 /*
  378  * Hook disconnection.
  379  */
  380 static int
  381 ng_gif_demux_disconnect(hook_p hook)
  382 {
  383         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  384         iffam_p iffam;
  385 
  386         if (hook == priv->gif)
  387                 priv->gif = NULL;
  388         else {
  389                 iffam = get_iffam_from_hook(priv, hook);
  390                 if (iffam == NULL)
  391                         panic("%s", __func__);
  392                 *get_hook_from_iffam(priv, iffam) = NULL;
  393         }
  394 
  395         return (0);
  396 }

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