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67 * ng_gif_demux(4) netgraph node type
69 * Packets received on the "gif" hook have their type header removed
70 * and are passed to the appropriate hook protocol hook. Packets
71 * recieved on a protocol hook have a type header added back and are
72 * passed out the gif hook. The currently supported protocol hooks are:
75 #include <sys/param.h>
76 #include <sys/systm.h>
77 #include <sys/kernel.h>
78 #include <sys/malloc.h>
79 #include <sys/ctype.h>
81 #include <sys/errno.h>
82 #include <sys/socket.h>
84 #include <netgraph/ng_message.h>
85 #include <netgraph/netgraph.h>
86 #include <netgraph/ng_parse.h>
87 #include <netgraph/ng_gif_demux.h>
89 #ifdef NG_SEPARATE_MALLOC
90 MALLOC_DEFINE(M_NETGRAPH_GIF_DEMUX, "netgraph_gif_demux",
91 "netgraph gif demux node");
93 #define M_NETGRAPH_GIF_DEMUX M_NETGRAPH
96 /* This struct describes one address family */
98 sa_family_t family; /* Address family */
99 const char *hookname; /* Name for hook */
101 typedef const struct iffam *iffam_p;
103 /* List of address families supported by our interface */
104 const static struct iffam gFamilies[] = {
105 { AF_INET, NG_GIF_DEMUX_HOOK_INET },
106 { AF_INET6, NG_GIF_DEMUX_HOOK_INET6 },
107 { AF_APPLETALK, NG_GIF_DEMUX_HOOK_ATALK },
108 { AF_IPX, NG_GIF_DEMUX_HOOK_IPX },
109 { AF_ATM, NG_GIF_DEMUX_HOOK_ATM },
110 { AF_NATM, NG_GIF_DEMUX_HOOK_NATM },
111 { AF_NS, NG_GIF_DEMUX_HOOK_NS },
113 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies))
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 */
121 typedef struct ng_gif_demux_private *priv_p;
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;
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);
137 /******************************************************************
139 ******************************************************************/
141 /* List of commands and how to convert arguments to/from ASCII */
142 static const struct ng_cmdlist ng_gif_demux_cmdlist[] = {
146 /* Node type descriptor */
147 static struct ng_type ng_gif_demux_typestruct = {
149 NG_GIF_DEMUX_NODE_TYPE,
151 ng_gif_demux_constructor,
153 ng_gif_demux_shutdown,
154 ng_gif_demux_newhook,
157 ng_gif_demux_rcvdata,
158 ng_gif_demux_disconnect,
159 ng_gif_demux_cmdlist,
161 NETGRAPH_INIT(gif_demux, &ng_gif_demux_typestruct);
163 /************************************************************************
165 ************************************************************************/
168 * Get the family descriptor from the family ID
170 static __inline__ iffam_p
171 get_iffam_from_af(sa_family_t family)
176 for (k = 0; k < NUM_FAMILIES; k++) {
177 iffam = &gFamilies[k];
178 if (iffam->family == family)
185 * Get the family descriptor from the hook
187 static __inline__ iffam_p
188 get_iffam_from_hook(priv_p priv, hook_p hook)
192 for (k = 0; k < NUM_FAMILIES; k++)
193 if (priv->hooks[k] == hook)
194 return (&gFamilies[k]);
199 * Get the hook from the iffam descriptor
202 static __inline__ hook_p *
203 get_hook_from_iffam(priv_p priv, iffam_p iffam)
205 return (&priv->hooks[iffam - gFamilies]);
209 * Get the iffam descriptor from the name
211 static __inline__ iffam_p
212 get_iffam_from_name(const char *name)
217 for (k = 0; k < NUM_FAMILIES; k++) {
218 iffam = &gFamilies[k];
219 if (!strcmp(iffam->hookname, name))
225 /******************************************************************
226 NETGRAPH NODE METHODS
227 ******************************************************************/
233 ng_gif_demux_constructor(node_p node)
237 /* Allocate and initialize private info */
238 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_GIF_DEMUX,
244 NG_NODE_SET_PRIVATE(node, priv);
251 * Method for attaching a new hook
254 ng_gif_demux_newhook(node_p node, hook_p hook, const char *name)
256 const priv_p priv = NG_NODE_PRIVATE(node);
260 if (strcmp(NG_GIF_DEMUX_HOOK_GIF, name) == 0)
261 hookptr = &priv->gif;
263 iffam = get_iffam_from_name(name);
265 return (EPFNOSUPPORT);
266 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
268 if (*hookptr != NULL)
275 * Receive a control message
278 ng_gif_demux_rcvmsg(node_p node, item_p item, hook_p lasthook)
280 struct ng_mesg *resp = NULL;
284 NGI_GET_MSG(item, msg);
285 switch (msg->header.typecookie) {
286 case NGM_GIF_DEMUX_COOKIE:
287 switch (msg->header.cmd) {
288 /* XXX: Add commands here. */
300 NG_RESPOND_MSG(error, node, item, resp);
306 * Receive data on a hook
309 ng_gif_demux_rcvdata(hook_p hook, item_p item)
311 const node_p node = NG_HOOK_NODE(hook);
312 const priv_p priv = NG_NODE_PRIVATE(node);
318 /* Pull the mbuf out of the item for processing. */
321 if (hook == priv->gif) {
323 * Pull off the address family header and find the
326 if (m->m_pkthdr.len < sizeof(sa_family_t)) {
331 if (m->m_len < sizeof(sa_family_t)
332 && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
336 iffam = get_iffam_from_af(*mtod(m, sa_family_t *));
342 outhook = *get_hook_from_iffam(priv, iffam);
343 m_adj(m, sizeof(sa_family_t));
346 * Add address family header and set the output hook.
348 iffam = get_iffam_from_hook(priv, hook);
349 M_PREPEND(m, sizeof (iffam->family), M_DONTWAIT);
355 bcopy(&iffam->family, mtod(m, sa_family_t *),
356 sizeof(iffam->family));
360 /* Stuff the mbuf back in. */
364 NG_FWD_ITEM_HOOK(error, item, outhook);
372 ng_gif_demux_shutdown(node_p node)
374 const priv_p priv = NG_NODE_PRIVATE(node);
376 FREE(priv, M_NETGRAPH_GIF_DEMUX);
377 NG_NODE_SET_PRIVATE(node, NULL);
383 * Hook disconnection.
386 ng_gif_demux_disconnect(hook_p hook)
388 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
391 if (hook == priv->gif)
394 iffam = get_iffam_from_hook(priv, hook);
397 *get_hook_from_iffam(priv, iffam) = NULL;