diff options
Diffstat (limited to 'sys/netgraph/ng_gif_demux.c')
| -rw-r--r-- | sys/netgraph/ng_gif_demux.c | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/sys/netgraph/ng_gif_demux.c b/sys/netgraph/ng_gif_demux.c new file mode 100644 index 0000000..084cf57 --- /dev/null +++ b/sys/netgraph/ng_gif_demux.c @@ -0,0 +1,398 @@ +/* + * ng_gif_demux.c + * + * Copyright 2001 The Aerospace Corporation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * + * Copyright (c) 1996-1999 Whistle Communications, Inc. + * All rights reserved. + * + * Subject to the following obligations and disclaimer of warranty, use and + * redistribution of this software, in source or object code forms, with or + * without modifications are expressly permitted by Whistle Communications; + * provided, however, that: + * 1. Any and all reproductions of the source or object code must include the + * copyright notice above and the following disclaimer of warranties; and + * 2. No rights are granted, in any manner or form, to use Whistle + * Communications, Inc. trademarks, including the mark "WHISTLE + * COMMUNICATIONS" on advertising, endorsements, or otherwise except as + * such appears in the above copyright notice or in the software. + * + * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND + * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO + * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, + * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. + * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY + * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS + * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. + * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES + * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING + * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, + * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * ng_gif_demux(4) netgraph node type + * + * Packets received on the "gif" hook have their type header removed + * and are passed to the appropriate hook protocol hook. Packets + * recieved on a protocol hook have a type header added back and are + * passed out the gif hook. The currently supported protocol hooks are: + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/ctype.h> +#include <sys/mbuf.h> +#include <sys/errno.h> +#include <sys/socket.h> + +#include <netgraph/ng_message.h> +#include <netgraph/netgraph.h> +#include <netgraph/ng_parse.h> +#include <netgraph/ng_gif_demux.h> + +#ifdef NG_SEPARATE_MALLOC +MALLOC_DEFINE(M_NETGRAPH_GIF_DEMUX, "netgraph_gif_demux", + "netgraph gif demux node"); +#else +#define M_NETGRAPH_GIF_DEMUX M_NETGRAPH +#endif + +/* This struct describes one address family */ +struct iffam { + sa_family_t family; /* Address family */ + const char *hookname; /* Name for hook */ +}; +typedef const struct iffam *iffam_p; + +/* List of address families supported by our interface */ +const static struct iffam gFamilies[] = { + { AF_INET, NG_GIF_DEMUX_HOOK_INET }, + { AF_INET6, NG_GIF_DEMUX_HOOK_INET6 }, + { AF_APPLETALK, NG_GIF_DEMUX_HOOK_ATALK }, + { AF_IPX, NG_GIF_DEMUX_HOOK_IPX }, + { AF_ATM, NG_GIF_DEMUX_HOOK_ATM }, + { AF_NATM, NG_GIF_DEMUX_HOOK_NATM }, + { AF_NS, NG_GIF_DEMUX_HOOK_NS }, +}; +#define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) + +/* Per-node private data */ +struct ng_gif_demux_private { + node_p node; /* Our netgraph node */ + hook_p gif; /* The gif hook */ + hook_p hooks[NUM_FAMILIES]; /* The protocol hooks */ +}; +typedef struct ng_gif_demux_private *priv_p; + +/* Netgraph node methods */ +static ng_constructor_t ng_gif_demux_constructor; +static ng_rcvmsg_t ng_gif_demux_rcvmsg; +static ng_shutdown_t ng_gif_demux_shutdown; +static ng_newhook_t ng_gif_demux_newhook; +static ng_rcvdata_t ng_gif_demux_rcvdata; +static ng_disconnect_t ng_gif_demux_disconnect; + +/* Helper stuff */ +static iffam_p get_iffam_from_af(sa_family_t family); +static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); +static iffam_p get_iffam_from_name(const char *name); +static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); + +/****************************************************************** + NETGRAPH PARSE TYPES +******************************************************************/ + +/* List of commands and how to convert arguments to/from ASCII */ +static const struct ng_cmdlist ng_gif_demux_cmdlist[] = { + { 0 } +}; + +/* Node type descriptor */ +static struct ng_type ng_gif_demux_typestruct = { + NG_ABI_VERSION, + NG_GIF_DEMUX_NODE_TYPE, + NULL, + ng_gif_demux_constructor, + ng_gif_demux_rcvmsg, + ng_gif_demux_shutdown, + ng_gif_demux_newhook, + NULL, + NULL, + ng_gif_demux_rcvdata, + ng_gif_demux_disconnect, + ng_gif_demux_cmdlist, +}; +NETGRAPH_INIT(gif_demux, &ng_gif_demux_typestruct); + +/************************************************************************ + HELPER STUFF + ************************************************************************/ + +/* + * Get the family descriptor from the family ID + */ +static __inline__ iffam_p +get_iffam_from_af(sa_family_t family) +{ + iffam_p iffam; + int k; + + for (k = 0; k < NUM_FAMILIES; k++) { + iffam = &gFamilies[k]; + if (iffam->family == family) + return (iffam); + } + return (NULL); +} + +/* + * Get the family descriptor from the hook + */ +static __inline__ iffam_p +get_iffam_from_hook(priv_p priv, hook_p hook) +{ + int k; + + for (k = 0; k < NUM_FAMILIES; k++) + if (priv->hooks[k] == hook) + return (&gFamilies[k]); + return (NULL); +} + +/* + * Get the hook from the iffam descriptor + */ + +static __inline__ hook_p * +get_hook_from_iffam(priv_p priv, iffam_p iffam) +{ + return (&priv->hooks[iffam - gFamilies]); +} + +/* + * Get the iffam descriptor from the name + */ +static __inline__ iffam_p +get_iffam_from_name(const char *name) +{ + iffam_p iffam; + int k; + + for (k = 0; k < NUM_FAMILIES; k++) { + iffam = &gFamilies[k]; + if (!strcmp(iffam->hookname, name)) + return (iffam); + } + return (NULL); +} + +/****************************************************************** + NETGRAPH NODE METHODS +******************************************************************/ + +/* + * Node constructor + */ +static int +ng_gif_demux_constructor(node_p node) +{ + priv_p priv; + + /* Allocate and initialize private info */ + MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_GIF_DEMUX, + M_NOWAIT | M_ZERO); + if (priv == NULL) + return (ENOMEM); + priv->node = node; + + NG_NODE_SET_PRIVATE(node, priv); + + /* Done */ + return (0); +} + +/* + * Method for attaching a new hook + */ +static int +ng_gif_demux_newhook(node_p node, hook_p hook, const char *name) +{ + const priv_p priv = NG_NODE_PRIVATE(node); + iffam_p iffam; + hook_p *hookptr; + + if (strcmp(NG_GIF_DEMUX_HOOK_GIF, name) == 0) + hookptr = &priv->gif; + else { + iffam = get_iffam_from_name(name); + if (iffam == NULL) + return (EPFNOSUPPORT); + hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); + } + if (*hookptr != NULL) + return (EISCONN); + *hookptr = hook; + return (0); +} + +/* + * Receive a control message + */ +static int +ng_gif_demux_rcvmsg(node_p node, item_p item, hook_p lasthook) +{ + struct ng_mesg *resp = NULL; + int error = 0; + struct ng_mesg *msg; + + NGI_GET_MSG(item, msg); + switch (msg->header.typecookie) { + case NGM_GIF_DEMUX_COOKIE: + switch (msg->header.cmd) { + /* XXX: Add commands here. */ + default: + error = EINVAL; + break; + } + break; + default: + error = EINVAL; + break; + } + + /* Done */ + NG_RESPOND_MSG(error, node, item, resp); + NG_FREE_MSG(msg); + return (error); +} + +/* + * Receive data on a hook + */ +static int +ng_gif_demux_rcvdata(hook_p hook, item_p item) +{ + const node_p node = NG_HOOK_NODE(hook); + const priv_p priv = NG_NODE_PRIVATE(node); + iffam_p iffam; + hook_p outhook; + int error = 0; + struct mbuf *m; + + /* Pull the mbuf out of the item for processing. */ + NGI_GET_M(item, m); + + if (hook == priv->gif) { + /* + * Pull off the address family header and find the + * output hook. + */ + if (m->m_pkthdr.len < sizeof(sa_family_t)) { + NG_FREE_M(m); + NG_FREE_ITEM(item); + return (EINVAL); + } + if (m->m_len < sizeof(sa_family_t) + && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) { + NG_FREE_ITEM(item); + return (ENOBUFS); + } + iffam = get_iffam_from_af(*mtod(m, sa_family_t *)); + if (iffam == NULL) { + NG_FREE_M(m); + NG_FREE_ITEM(item); + return (EINVAL); + } + outhook = *get_hook_from_iffam(priv, iffam); + m_adj(m, sizeof(sa_family_t)); + } else { + /* + * Add address family header and set the output hook. + */ + iffam = get_iffam_from_hook(priv, hook); + M_PREPEND(m, sizeof (iffam->family), M_DONTWAIT); + if (m == NULL) { + NG_FREE_M(m); + NG_FREE_ITEM(item); + return (ENOBUFS); + } + bcopy(&iffam->family, mtod(m, sa_family_t *), + sizeof(iffam->family)); + outhook = priv->gif; + } + + /* Stuff the mbuf back in. */ + NGI_M(item) = m; + + /* Deliver packet */ + NG_FWD_ITEM_HOOK(error, item, outhook); + return (error); +} + +/* + * Shutdown node + */ +static int +ng_gif_demux_shutdown(node_p node) +{ + const priv_p priv = NG_NODE_PRIVATE(node); + + FREE(priv, M_NETGRAPH_GIF_DEMUX); + NG_NODE_SET_PRIVATE(node, NULL); + NG_NODE_UNREF(node); + return (0); +} + +/* + * Hook disconnection. + */ +static int +ng_gif_demux_disconnect(hook_p hook) +{ + const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); + iffam_p iffam; + + if (hook == priv->gif) + priv->gif = NULL; + else { + iffam = get_iffam_from_hook(priv, hook); + if (iffam == NULL) + panic(__FUNCTION__); + *get_hook_from_iffam(priv, iffam) = NULL; + } + + return (0); +} |
