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69 * ng_gif_demux(4) netgraph node type
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:
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>
83 #include <sys/errno.h>
84 #include <sys/socket.h>
86 #include <netgraph/ng_message.h>
87 #include <netgraph/netgraph.h>
88 #include <netgraph/ng_parse.h>
89 #include <netgraph/ng_gif_demux.h>
91 #ifdef NG_SEPARATE_MALLOC
92 static MALLOC_DEFINE(M_NETGRAPH_GIF_DEMUX, "netgraph_gif_demux",
93 "netgraph gif demux node");
95 #define M_NETGRAPH_GIF_DEMUX M_NETGRAPH
98 /* This struct describes one address family */
100 sa_family_t family; /* Address family */
101 const char *hookname; /* Name for hook */
103 typedef const struct iffam *iffam_p;
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 },
114 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies))
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 */
122 typedef struct ng_gif_demux_private *priv_p;
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;
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);
138 /******************************************************************
140 ******************************************************************/
142 /* List of commands and how to convert arguments to/from ASCII */
143 static const struct ng_cmdlist ng_gif_demux_cmdlist[] = {
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,
159 NETGRAPH_INIT(gif_demux, &ng_gif_demux_typestruct);
161 /************************************************************************
163 ************************************************************************/
166 * Get the family descriptor from the family ID
168 static __inline iffam_p
169 get_iffam_from_af(sa_family_t family)
174 for (k = 0; k < NUM_FAMILIES; k++) {
175 iffam = &gFamilies[k];
176 if (iffam->family == family)
183 * Get the family descriptor from the hook
185 static __inline iffam_p
186 get_iffam_from_hook(priv_p priv, hook_p hook)
190 for (k = 0; k < NUM_FAMILIES; k++)
191 if (priv->hooks[k] == hook)
192 return (&gFamilies[k]);
197 * Get the hook from the iffam descriptor
200 static __inline hook_p *
201 get_hook_from_iffam(priv_p priv, iffam_p iffam)
203 return (&priv->hooks[iffam - gFamilies]);
207 * Get the iffam descriptor from the name
209 static __inline iffam_p
210 get_iffam_from_name(const char *name)
215 for (k = 0; k < NUM_FAMILIES; k++) {
216 iffam = &gFamilies[k];
217 if (!strcmp(iffam->hookname, name))
223 /******************************************************************
224 NETGRAPH NODE METHODS
225 ******************************************************************/
231 ng_gif_demux_constructor(node_p node)
235 /* Allocate and initialize private info */
236 priv = malloc(sizeof(*priv), M_NETGRAPH_GIF_DEMUX, M_WAITOK | M_ZERO);
239 NG_NODE_SET_PRIVATE(node, priv);
246 * Method for attaching a new hook
249 ng_gif_demux_newhook(node_p node, hook_p hook, const char *name)
251 const priv_p priv = NG_NODE_PRIVATE(node);
255 if (strcmp(NG_GIF_DEMUX_HOOK_GIF, name) == 0)
256 hookptr = &priv->gif;
258 iffam = get_iffam_from_name(name);
260 return (EPFNOSUPPORT);
261 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
263 if (*hookptr != NULL)
270 * Receive a control message
273 ng_gif_demux_rcvmsg(node_p node, item_p item, hook_p lasthook)
275 struct ng_mesg *resp = NULL;
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. */
295 NG_RESPOND_MSG(error, node, item, resp);
301 * Receive data on a hook
304 ng_gif_demux_rcvdata(hook_p hook, item_p item)
306 const node_p node = NG_HOOK_NODE(hook);
307 const priv_p priv = NG_NODE_PRIVATE(node);
313 /* Pull the mbuf out of the item for processing. */
316 if (hook == priv->gif) {
318 * Pull off the address family header and find the
321 if (m->m_pkthdr.len < sizeof(sa_family_t)) {
326 if (m->m_len < sizeof(sa_family_t)
327 && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
331 iffam = get_iffam_from_af(*mtod(m, sa_family_t *));
337 outhook = *get_hook_from_iffam(priv, iffam);
338 m_adj(m, sizeof(sa_family_t));
341 * Add address family header and set the output hook.
343 iffam = get_iffam_from_hook(priv, hook);
344 M_PREPEND(m, sizeof (iffam->family), M_DONTWAIT);
350 bcopy(&iffam->family, mtod(m, sa_family_t *),
351 sizeof(iffam->family));
355 /* Stuff the mbuf back in. */
359 NG_FWD_ITEM_HOOK(error, item, outhook);
367 ng_gif_demux_shutdown(node_p node)
369 const priv_p priv = NG_NODE_PRIVATE(node);
371 free(priv, M_NETGRAPH_GIF_DEMUX);
372 NG_NODE_SET_PRIVATE(node, NULL);
378 * Hook disconnection.
381 ng_gif_demux_disconnect(hook_p hook)
383 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
386 if (hook == priv->gif)
389 iffam = get_iffam_from_hook(priv, hook);
391 panic("%s", __func__);
392 *get_hook_from_iffam(priv, iffam) = NULL;