400 lines
11 KiB
C
400 lines
11 KiB
C
/*
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* ng_gif_demux.c
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*/
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/*-
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* Copyright 2001 The Aerospace Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions, and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of The Aerospace Corporation may not be used to endorse or
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* promote products derived from this software.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* ng_gif_demux(4) netgraph node type
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*
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* Packets received on the "gif" hook have their type header removed
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* and are passed to the appropriate hook protocol hook. Packets
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* recieved on a protocol hook have a type header added back and are
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* passed out the gif hook. The currently supported protocol hooks are:
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/ctype.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/socket.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_parse.h>
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#include <netgraph/ng_gif_demux.h>
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#ifdef NG_SEPARATE_MALLOC
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MALLOC_DEFINE(M_NETGRAPH_GIF_DEMUX, "netgraph_gif_demux",
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"netgraph gif demux node");
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#else
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#define M_NETGRAPH_GIF_DEMUX M_NETGRAPH
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#endif
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/* This struct describes one address family */
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struct iffam {
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sa_family_t family; /* Address family */
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const char *hookname; /* Name for hook */
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};
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typedef const struct iffam *iffam_p;
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/* List of address families supported by our interface */
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const static struct iffam gFamilies[] = {
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{ AF_INET, NG_GIF_DEMUX_HOOK_INET },
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{ AF_INET6, NG_GIF_DEMUX_HOOK_INET6 },
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{ AF_APPLETALK, NG_GIF_DEMUX_HOOK_ATALK },
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{ AF_IPX, NG_GIF_DEMUX_HOOK_IPX },
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{ AF_ATM, NG_GIF_DEMUX_HOOK_ATM },
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{ AF_NATM, NG_GIF_DEMUX_HOOK_NATM },
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};
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#define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies))
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/* Per-node private data */
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struct ng_gif_demux_private {
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node_p node; /* Our netgraph node */
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hook_p gif; /* The gif hook */
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hook_p hooks[NUM_FAMILIES]; /* The protocol hooks */
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};
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typedef struct ng_gif_demux_private *priv_p;
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/* Netgraph node methods */
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static ng_constructor_t ng_gif_demux_constructor;
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static ng_rcvmsg_t ng_gif_demux_rcvmsg;
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static ng_shutdown_t ng_gif_demux_shutdown;
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static ng_newhook_t ng_gif_demux_newhook;
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static ng_rcvdata_t ng_gif_demux_rcvdata;
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static ng_disconnect_t ng_gif_demux_disconnect;
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/* Helper stuff */
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static iffam_p get_iffam_from_af(sa_family_t family);
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static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook);
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static iffam_p get_iffam_from_name(const char *name);
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static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam);
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/******************************************************************
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NETGRAPH PARSE TYPES
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******************************************************************/
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/* List of commands and how to convert arguments to/from ASCII */
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static const struct ng_cmdlist ng_gif_demux_cmdlist[] = {
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{ 0 }
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};
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/* Node type descriptor */
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static struct ng_type ng_gif_demux_typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_GIF_DEMUX_NODE_TYPE,
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.constructor = ng_gif_demux_constructor,
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.rcvmsg = ng_gif_demux_rcvmsg,
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.shutdown = ng_gif_demux_shutdown,
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.newhook = ng_gif_demux_newhook,
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.rcvdata = ng_gif_demux_rcvdata,
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.disconnect = ng_gif_demux_disconnect,
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.cmdlist = ng_gif_demux_cmdlist,
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};
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NETGRAPH_INIT(gif_demux, &ng_gif_demux_typestruct);
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/************************************************************************
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HELPER STUFF
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************************************************************************/
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/*
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* Get the family descriptor from the family ID
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*/
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static __inline iffam_p
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get_iffam_from_af(sa_family_t family)
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{
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iffam_p iffam;
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int k;
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for (k = 0; k < NUM_FAMILIES; k++) {
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iffam = &gFamilies[k];
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if (iffam->family == family)
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return (iffam);
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}
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return (NULL);
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}
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/*
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* Get the family descriptor from the hook
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*/
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static __inline iffam_p
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get_iffam_from_hook(priv_p priv, hook_p hook)
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{
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int k;
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for (k = 0; k < NUM_FAMILIES; k++)
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if (priv->hooks[k] == hook)
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return (&gFamilies[k]);
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return (NULL);
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}
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/*
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* Get the hook from the iffam descriptor
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*/
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static __inline hook_p *
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get_hook_from_iffam(priv_p priv, iffam_p iffam)
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{
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return (&priv->hooks[iffam - gFamilies]);
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}
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/*
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* Get the iffam descriptor from the name
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*/
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static __inline iffam_p
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get_iffam_from_name(const char *name)
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{
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iffam_p iffam;
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int k;
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for (k = 0; k < NUM_FAMILIES; k++) {
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iffam = &gFamilies[k];
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if (!strcmp(iffam->hookname, name))
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return (iffam);
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}
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return (NULL);
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}
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/******************************************************************
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NETGRAPH NODE METHODS
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******************************************************************/
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/*
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* Node constructor
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*/
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static int
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ng_gif_demux_constructor(node_p node)
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{
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priv_p priv;
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/* Allocate and initialize private info */
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priv = malloc(sizeof(*priv), M_NETGRAPH_GIF_DEMUX,
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M_NOWAIT | M_ZERO);
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if (priv == NULL)
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return (ENOMEM);
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priv->node = node;
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NG_NODE_SET_PRIVATE(node, priv);
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/* Done */
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return (0);
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}
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/*
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* Method for attaching a new hook
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*/
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static int
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ng_gif_demux_newhook(node_p node, hook_p hook, const char *name)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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iffam_p iffam;
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hook_p *hookptr;
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if (strcmp(NG_GIF_DEMUX_HOOK_GIF, name) == 0)
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hookptr = &priv->gif;
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else {
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iffam = get_iffam_from_name(name);
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if (iffam == NULL)
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return (EPFNOSUPPORT);
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hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
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}
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if (*hookptr != NULL)
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return (EISCONN);
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*hookptr = hook;
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return (0);
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}
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/*
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* Receive a control message
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*/
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static int
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ng_gif_demux_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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struct ng_mesg *resp = NULL;
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int error = 0;
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struct ng_mesg *msg;
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NGI_GET_MSG(item, msg);
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switch (msg->header.typecookie) {
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case NGM_GIF_DEMUX_COOKIE:
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switch (msg->header.cmd) {
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/* XXX: Add commands here. */
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default:
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error = EINVAL;
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break;
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}
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break;
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default:
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error = EINVAL;
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break;
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}
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/* Done */
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NG_RESPOND_MSG(error, node, item, resp);
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NG_FREE_MSG(msg);
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return (error);
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}
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/*
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* Receive data on a hook
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*/
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static int
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ng_gif_demux_rcvdata(hook_p hook, item_p item)
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{
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const node_p node = NG_HOOK_NODE(hook);
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const priv_p priv = NG_NODE_PRIVATE(node);
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iffam_p iffam;
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hook_p outhook;
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int error = 0;
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struct mbuf *m;
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/* Pull the mbuf out of the item for processing. */
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NGI_GET_M(item, m);
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if (hook == priv->gif) {
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/*
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* Pull off the address family header and find the
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* output hook.
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*/
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if (m->m_pkthdr.len < sizeof(sa_family_t)) {
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NG_FREE_M(m);
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NG_FREE_ITEM(item);
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return (EINVAL);
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}
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if (m->m_len < sizeof(sa_family_t)
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&& (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
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NG_FREE_ITEM(item);
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return (ENOBUFS);
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}
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iffam = get_iffam_from_af(*mtod(m, sa_family_t *));
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if (iffam == NULL) {
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NG_FREE_M(m);
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NG_FREE_ITEM(item);
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return (EINVAL);
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}
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outhook = *get_hook_from_iffam(priv, iffam);
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m_adj(m, sizeof(sa_family_t));
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} else {
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/*
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* Add address family header and set the output hook.
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*/
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iffam = get_iffam_from_hook(priv, hook);
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M_PREPEND(m, sizeof (iffam->family), M_DONTWAIT);
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if (m == NULL) {
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NG_FREE_M(m);
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NG_FREE_ITEM(item);
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return (ENOBUFS);
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}
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bcopy(&iffam->family, mtod(m, sa_family_t *),
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sizeof(iffam->family));
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outhook = priv->gif;
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}
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/* Stuff the mbuf back in. */
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NGI_M(item) = m;
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/* Deliver packet */
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NG_FWD_ITEM_HOOK(error, item, outhook);
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return (error);
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}
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/*
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* Shutdown node
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*/
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static int
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ng_gif_demux_shutdown(node_p node)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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free(priv, M_NETGRAPH_GIF_DEMUX);
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NG_NODE_SET_PRIVATE(node, NULL);
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NG_NODE_UNREF(node);
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return (0);
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}
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/*
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* Hook disconnection.
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*/
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static int
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ng_gif_demux_disconnect(hook_p hook)
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{
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const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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iffam_p iffam;
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if (hook == priv->gif)
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priv->gif = NULL;
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else {
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iffam = get_iffam_from_hook(priv, hook);
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if (iffam == NULL)
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panic(__func__);
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*get_hook_from_iffam(priv, iffam) = NULL;
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}
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return (0);
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}
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