sys/netgraph7/ng_gif_demux.c

   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: src/sys/netgraph/ng_gif_demux.c,v 1.10 2005/01/07 01:45:39 imp Exp $
  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  * recieved 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 "ng_message.h"
  87 #include "netgraph.h"
  88 #include "ng_parse.h"
  89 #include "ng_gif_demux.h"
  90
  91 #ifdef NG_SEPARATE_MALLOC
  92 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_IPX,       NG_GIF_DEMUX_HOOK_IPX   },
 110         { AF_ATM,       NG_GIF_DEMUX_HOOK_ATM   },
 111         { AF_NATM,      NG_GIF_DEMUX_HOOK_NATM  },
 112 };
 113 #define NUM_FAMILIES            NELEM(gFamilies)
 114
 115 /* Per-node private data */
 116 struct ng_gif_demux_private {
 117         node_p  node;                   /* Our netgraph node */
 118         hook_p  gif;                    /* The gif hook */
 119         hook_p  hooks[NUM_FAMILIES];    /* The protocol hooks */
 120 };
 121 typedef struct ng_gif_demux_private *priv_p;
 122
 123 /* Netgraph node methods */
 124 static ng_constructor_t ng_gif_demux_constructor;
 125 static ng_rcvmsg_t      ng_gif_demux_rcvmsg;
 126 static ng_shutdown_t    ng_gif_demux_shutdown;
 127 static ng_newhook_t     ng_gif_demux_newhook;
 128 static ng_rcvdata_t     ng_gif_demux_rcvdata;
 129 static ng_disconnect_t  ng_gif_demux_disconnect;
 130
 131 /* Helper stuff */
 132 static iffam_p  get_iffam_from_af(sa_family_t family);
 133 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 134 static iffam_p  get_iffam_from_name(const char *name);
 135 static hook_p   *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 136
 137 /******************************************************************
 138                     NETGRAPH PARSE TYPES
 139 ******************************************************************/
 140
 141 /* List of commands and how to convert arguments to/from ASCII */
 142 static const struct ng_cmdlist ng_gif_demux_cmdlist[] = {
 143         { 0 }
 144 };
 145
 146 /* Node type descriptor */
 147 static struct ng_type ng_gif_demux_typestruct = {
 148         .version =      NG_ABI_VERSION,
 149         .name =         NG_GIF_DEMUX_NODE_TYPE,
 150         .constructor =  ng_gif_demux_constructor,
 151         .rcvmsg =       ng_gif_demux_rcvmsg,
 152         .shutdown =     ng_gif_demux_shutdown,
 153         .newhook =      ng_gif_demux_newhook,
 154         .rcvdata =      ng_gif_demux_rcvdata,
 155         .disconnect =   ng_gif_demux_disconnect,
 156         .cmdlist =      ng_gif_demux_cmdlist,
 157 };
 158 NETGRAPH_INIT(gif_demux, &ng_gif_demux_typestruct);
 159
 160 /************************************************************************
 161                     HELPER STUFF
 162  ************************************************************************/
 163
 164 /*
 165  * Get the family descriptor from the family ID
 166  */
 167 static __inline iffam_p
 168 get_iffam_from_af(sa_family_t family)
 169 {
 170         iffam_p iffam;
 171         int k;
 172
 173         for (k = 0; k < NUM_FAMILIES; k++) {
 174                 iffam = &gFamilies[k];
 175                 if (iffam->family == family)
 176                         return (iffam);
 177         }
 178         return (NULL);
 179 }
 180
 181 /*
 182  * Get the family descriptor from the hook
 183  */
 184 static __inline iffam_p
 185 get_iffam_from_hook(priv_p priv, hook_p hook)
 186 {
 187         int k;
 188
 189         for (k = 0; k < NUM_FAMILIES; k++)
 190                 if (priv->hooks[k] == hook)
 191                         return (&gFamilies[k]);
 192         return (NULL);
 193 }
 194
 195 /*
 196  * Get the hook from the iffam descriptor
 197  */
 198
 199 static __inline hook_p *
 200 get_hook_from_iffam(priv_p priv, iffam_p iffam)
 201 {
 202         return (&priv->hooks[iffam - gFamilies]);
 203 }
 204
 205 /*
 206  * Get the iffam descriptor from the name
 207  */
 208 static __inline iffam_p
 209 get_iffam_from_name(const char *name)
 210 {
 211         iffam_p iffam;
 212         int k;
 213
 214         for (k = 0; k < NUM_FAMILIES; k++) {
 215                 iffam = &gFamilies[k];
 216                 if (!strcmp(iffam->hookname, name))
 217                         return (iffam);
 218         }
 219         return (NULL);
 220 }
 221
 222 /******************************************************************
 223                     NETGRAPH NODE METHODS
 224 ******************************************************************/
 225
 226 /*
 227  * Node constructor
 228  */
 229 static int
 230 ng_gif_demux_constructor(node_p node)
 231 {
 232         priv_p priv;
 233
 234         /* Allocate and initialize private info */
 235         priv = kmalloc(sizeof(*priv), M_NETGRAPH_GIF_DEMUX,
 236                        M_WAITOK | M_NULLOK | M_ZERO);
 237         if (priv == NULL)
 238                 return (ENOMEM);
 239         priv->node = node;
 240
 241         NG_NODE_SET_PRIVATE(node, priv);
 242
 243         /* Done */
 244         return (0);
 245 }
 246
 247 /*
 248  * Method for attaching a new hook
 249  */
 250 static  int
 251 ng_gif_demux_newhook(node_p node, hook_p hook, const char *name)
 252 {
 253         const priv_p priv = NG_NODE_PRIVATE(node);
 254         iffam_p iffam;
 255         hook_p *hookptr;
 256
 257         if (strcmp(NG_GIF_DEMUX_HOOK_GIF, name) == 0)
 258                 hookptr = &priv->gif;
 259         else {
 260                 iffam = get_iffam_from_name(name);
 261                 if (iffam == NULL)
 262                         return (EPFNOSUPPORT);
 263                 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
 264         }
 265         if (*hookptr != NULL)
 266                 return (EISCONN);
 267         *hookptr = hook;
 268         return (0);
 269 }
 270
 271 /*
 272  * Receive a control message
 273  */
 274 static int
 275 ng_gif_demux_rcvmsg(node_p node, item_p item, hook_p lasthook)
 276 {
 277         struct ng_mesg *resp = NULL;
 278         int error = 0;
 279         struct ng_mesg *msg;
 280
 281         NGI_GET_MSG(item, msg);
 282         switch (msg->header.typecookie) {
 283         case NGM_GIF_DEMUX_COOKIE:
 284                 switch (msg->header.cmd) {
 285                 /* XXX: Add commands here. */
 286                 default:
 287                         error = EINVAL;
 288                         break;
 289                 }
 290                 break;
 291         default:
 292                 error = EINVAL;
 293                 break;
 294         }
 295
 296         /* Done */
 297         NG_RESPOND_MSG(error, node, item, resp);
 298         NG_FREE_MSG(msg);
 299         return (error);
 300 }
 301
 302 /*
 303  * Receive data on a hook
 304  */
 305 static int
 306 ng_gif_demux_rcvdata(hook_p hook, item_p item)
 307 {
 308         const node_p node = NG_HOOK_NODE(hook);
 309         const priv_p priv = NG_NODE_PRIVATE(node);
 310         iffam_p iffam;
 311         hook_p outhook;
 312         int error = 0;
 313         struct mbuf *m;
 314
 315         /* Pull the mbuf out of the item for processing. */
 316         NGI_GET_M(item, m);
 317
 318         if (hook == priv->gif) {
 319                 /*
 320                  * Pull off the address family header and find the
 321                  * output hook.
 322                  */
 323                 if (m->m_pkthdr.len < sizeof(sa_family_t)) {
 324                         NG_FREE_M(m);
 325                         NG_FREE_ITEM(item);
 326                         return (EINVAL);
 327                 }
 328                 if (m->m_len < sizeof(sa_family_t)
 329                     && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
 330                         NG_FREE_ITEM(item);
 331                         return (ENOBUFS);
 332                 }
 333                 iffam = get_iffam_from_af(*mtod(m, sa_family_t *));
 334                 if (iffam == NULL) {
 335                         NG_FREE_M(m);
 336                         NG_FREE_ITEM(item);
 337                         return (EINVAL);
 338                 }
 339                 outhook = *get_hook_from_iffam(priv, iffam);
 340                 m_adj(m, sizeof(sa_family_t));
 341         } else {
 342                 /*
 343                  * Add address family header and set the output hook.
 344                  */
 345                 iffam = get_iffam_from_hook(priv, hook);
 346                 M_PREPEND(m, sizeof (iffam->family), M_NOWAIT);
 347                 if (m == NULL) {
 348                         NG_FREE_M(m);
 349                         NG_FREE_ITEM(item);
 350                         return (ENOBUFS);
 351                 }
 352                 bcopy(&iffam->family, mtod(m, sa_family_t *),
 353                     sizeof(iffam->family));
 354                 outhook = priv->gif;
 355         }
 356
 357         /* Stuff the mbuf back in. */
 358         NGI_M(item) = m;
 359
 360         /* Deliver packet */
 361         NG_FWD_ITEM_HOOK(error, item, outhook);
 362         return (error);
 363 }
 364
 365 /*
 366  * Shutdown node
 367  */
 368 static int
 369 ng_gif_demux_shutdown(node_p node)
 370 {
 371         const priv_p priv = NG_NODE_PRIVATE(node);
 372
 373         kfree(priv, M_NETGRAPH_GIF_DEMUX);
 374         NG_NODE_SET_PRIVATE(node, NULL);
 375         NG_NODE_UNREF(node);
 376         return (0);
 377 }
 378
 379 /*
 380  * Hook disconnection.
 381  */
 382 static int
 383 ng_gif_demux_disconnect(hook_p hook)
 384 {
 385         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 386         iffam_p iffam;
 387
 388         if (hook == priv->gif)
 389                 priv->gif = NULL;
 390         else {
 391                 iffam = get_iffam_from_hook(priv, hook);
 392                 if (iffam == NULL)
 393                         panic(__func__);
 394                 *get_hook_from_iffam(priv, iffam) = NULL;
 395         }
 396
 397         return (0);
 398 }