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67 * ng_gif(4) netgraph node type
70 #include <sys/param.h>
71 #include <sys/systm.h>
72 #include <sys/kernel.h>
73 #include <sys/malloc.h>
75 #include <sys/errno.h>
76 #include <sys/syslog.h>
77 #include <sys/socket.h>
80 #include <net/route.h>
81 #include <net/if_types.h>
82 #include <net/if_var.h>
83 #include <net/if_gif.h>
85 #include <netgraph/ng_message.h>
86 #include <netgraph/netgraph.h>
87 #include <netgraph/ng_parse.h>
88 #include <netgraph/ng_gif.h>
90 #define IFP2NG(ifp) ((struct ng_node *)((struct gif_softc *)(ifp))->gif_netgraph)
92 /* Per-node private data */
94 struct ifnet *ifp; /* associated interface */
95 hook_p lower; /* lower OR orphan hook connection */
96 u_char lowerOrphan; /* whether lower is lower or orphan */
98 typedef struct private *priv_p;
100 /* Functional hooks called from if_gif.c */
101 static void ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af);
102 static void ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af);
103 static void ng_gif_attach(struct ifnet *ifp);
104 static void ng_gif_detach(struct ifnet *ifp);
106 /* Other functions */
107 static void ng_gif_input2(node_p node, struct mbuf **mp, int af);
108 static int ng_gif_glue_af(struct mbuf **mp, int af);
109 static int ng_gif_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
111 /* Netgraph node methods */
112 static ng_constructor_t ng_gif_constructor;
113 static ng_rcvmsg_t ng_gif_rcvmsg;
114 static ng_shutdown_t ng_gif_shutdown;
115 static ng_newhook_t ng_gif_newhook;
116 static ng_connect_t ng_gif_connect;
117 static ng_rcvdata_t ng_gif_rcvdata;
118 static ng_disconnect_t ng_gif_disconnect;
119 static int ng_gif_mod_event(module_t mod, int event, void *data);
121 /* List of commands and how to convert arguments to/from ASCII */
122 static const struct ng_cmdlist ng_gif_cmdlist[] = {
128 &ng_parse_string_type
140 static struct ng_type ng_gif_typestruct = {
154 MODULE_VERSION(ng_gif, 1);
155 MODULE_DEPEND(ng_gif, if_gif, 1,1,1);
156 NETGRAPH_INIT(gif, &ng_gif_typestruct);
158 /******************************************************************
160 ******************************************************************/
163 * Handle a packet that has come in on an interface. We get to
164 * look at it here before any upper layer protocols do.
166 * NOTE: this function will get called at splimp()
169 ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af)
171 const node_p node = IFP2NG(ifp);
172 const priv_p priv = NG_NODE_PRIVATE(node);
174 /* If "lower" hook not connected, let packet continue */
175 if (priv->lower == NULL || priv->lowerOrphan)
177 ng_gif_input2(node, mp, af);
181 * Handle a packet that has come in on an interface, and which
182 * does not match any of our known protocols (an ``orphan'').
184 * NOTE: this function will get called at splimp()
187 ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af)
189 const node_p node = IFP2NG(ifp);
190 const priv_p priv = NG_NODE_PRIVATE(node);
192 /* If "orphan" hook not connected, let packet continue */
193 if (priv->lower == NULL || !priv->lowerOrphan) {
197 ng_gif_input2(node, &m, af);
203 * Handle a packet that has come in on a gif interface.
204 * Attach the address family to the mbuf for later use.
206 * NOTE: this function will get called at splimp()
209 ng_gif_input2(node_p node, struct mbuf **mp, int af)
211 const priv_p priv = NG_NODE_PRIVATE(node);
214 /* Glue address family on */
215 if ((error = ng_gif_glue_af(mp, af)) != 0)
218 /* Send out lower/orphan hook */
219 NG_SEND_DATA_ONLY(error, priv->lower, *mp);
224 * A new gif interface has been attached.
225 * Create a new node for it, etc.
228 ng_gif_attach(struct ifnet *ifp)
234 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
235 if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) {
236 log(LOG_ERR, "%s: can't %s for %s\n",
237 __func__, "create node", ifp->if_xname);
241 /* Allocate private data */
242 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
244 log(LOG_ERR, "%s: can't %s for %s\n",
245 __func__, "allocate memory", ifp->if_xname);
249 NG_NODE_SET_PRIVATE(node, priv);
253 /* Try to give the node the same name as the interface */
254 if (ng_name_node(node, ifp->if_xname) != 0) {
255 log(LOG_WARNING, "%s: can't name node %s\n",
256 __func__, ifp->if_xname);
261 * An interface is being detached.
262 * REALLY Destroy its node.
265 ng_gif_detach(struct ifnet *ifp)
267 const node_p node = IFP2NG(ifp);
270 if (node == NULL) /* no node (why not?), ignore */
272 priv = NG_NODE_PRIVATE(node);
273 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
275 * We can't assume the ifnet is still around when we run shutdown
276 * So zap it now. XXX We HOPE that anything running at this time
277 * handles it (as it should in the non netgraph case).
280 priv->ifp = NULL; /* XXX race if interrupted an output packet */
281 ng_rmnode_self(node); /* remove all netgraph parts */
285 * Optimization for gluing the address family onto
286 * the front of an incoming packet.
289 ng_gif_glue_af(struct mbuf **mp, int af)
291 struct mbuf *m = *mp;
295 tmp_af = (sa_family_t) af;
298 * XXX: should try to bring back some of the optimizations from
303 * Doing anything more is likely to get more
304 * expensive than it's worth..
305 * it's probable that everything else is in one
306 * big lump. The next node will do an m_pullup()
307 * for exactly the amount of data it needs and
308 * hopefully everything after that will not
309 * need one. So let's just use M_PREPEND.
311 M_PREPEND(m, sizeof (tmp_af), M_DONTWAIT);
320 /* Copy header and return (possibly new) mbuf */
321 *mtod(m, sa_family_t *) = tmp_af;
323 bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af));
330 /******************************************************************
331 NETGRAPH NODE METHODS
332 ******************************************************************/
335 * It is not possible or allowable to create a node of this type.
336 * Nodes get created when the interface is attached (or, when
337 * this node type's KLD is loaded).
340 ng_gif_constructor(node_p node)
346 * Check for attaching a new hook.
349 ng_gif_newhook(node_p node, hook_p hook, const char *name)
351 const priv_p priv = NG_NODE_PRIVATE(node);
352 u_char orphan = priv->lowerOrphan;
355 /* Divert hook is an alias for lower */
356 if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0)
357 name = NG_GIF_HOOK_LOWER;
360 if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) {
361 hookptr = &priv->lower;
363 } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) {
364 hookptr = &priv->lower;
369 /* Check if already connected (shouldn't be, but doesn't hurt) */
370 if (*hookptr != NULL)
375 priv->lowerOrphan = orphan;
380 * Hooks are attached, adjust to force queueing.
381 * We don't really care which hook it is.
382 * they should all be queuing for outgoing data.
385 ng_gif_connect(hook_p hook)
387 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
392 * Receive an incoming control message.
395 ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook)
397 const priv_p priv = NG_NODE_PRIVATE(node);
398 struct ng_mesg *resp = NULL;
402 NGI_GET_MSG(item, msg);
403 switch (msg->header.typecookie) {
405 switch (msg->header.cmd) {
406 case NGM_GIF_GET_IFNAME:
407 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
412 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1);
414 case NGM_GIF_GET_IFINDEX:
415 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
420 *((u_int32_t *)resp->data) = priv->ifp->if_index;
431 NG_RESPOND_MSG(error, node, item, resp);
437 * Receive data on a hook.
440 ng_gif_rcvdata(hook_p hook, item_p item)
442 const node_p node = NG_HOOK_NODE(hook);
443 const priv_p priv = NG_NODE_PRIVATE(node);
448 NGI_GET_META(item, meta);
450 if (hook == priv->lower)
451 return ng_gif_rcv_lower(node, m, meta);
452 panic("%s: weird hook", __func__);
456 * Handle an mbuf received on the "lower" hook.
459 ng_gif_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
462 const priv_p priv = NG_NODE_PRIVATE(node);
464 bzero(&dst, sizeof(dst));
466 /* We don't process metadata. */
469 /* Make sure header is fully pulled up */
470 if (m->m_pkthdr.len < sizeof(sa_family_t)) {
474 if (m->m_len < sizeof(sa_family_t)
475 && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
479 dst.sa_family = *mtod(m, sa_family_t *);
480 m_adj(m, sizeof(sa_family_t));
482 /* Send it on its way */
484 * XXX: gif_output only uses dst for the family and passes the
485 * fourth argument (rt) to in{,6}_gif_output which ignore it.
486 * If this changes ng_gif will probably break.
488 return gif_output(priv->ifp, m, &dst, NULL);
492 * Shutdown node. This resets the node but does not remove it
493 * unless the REALLY_DIE flag is set.
496 ng_gif_shutdown(node_p node)
498 const priv_p priv = NG_NODE_PRIVATE(node);
500 if (node->nd_flags & NG_REALLY_DIE) {
502 * WE came here because the gif interface is being destroyed,
503 * so stop being persistant.
504 * Actually undo all the things we did on creation.
505 * Assume the ifp has already been freed.
507 NG_NODE_SET_PRIVATE(node, NULL);
508 FREE(priv, M_NETGRAPH);
509 NG_NODE_UNREF(node); /* free node itself */
512 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */
517 * Hook disconnection.
520 ng_gif_disconnect(hook_p hook)
522 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
524 if (hook == priv->lower) {
526 priv->lowerOrphan = 0;
528 panic("%s: weird hook", __func__);
529 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
530 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
531 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
536 /******************************************************************
538 ******************************************************************/
541 * Handle loading and unloading for this node type.
544 ng_gif_mod_event(module_t mod, int event, void *data)
554 /* Register function hooks */
555 if (ng_gif_attach_p != NULL) {
559 ng_gif_attach_p = ng_gif_attach;
560 ng_gif_detach_p = ng_gif_detach;
561 ng_gif_input_p = ng_gif_input;
562 ng_gif_input_orphan_p = ng_gif_input_orphan;
564 /* Create nodes for any already-existing gif interfaces */
566 TAILQ_FOREACH(ifp, &ifnet, if_link) {
567 if (ifp->if_type == IFT_GIF)
576 * Note that the base code won't try to unload us until
577 * all nodes have been removed, and that can't happen
578 * until all gif interfaces are destroyed. In any
579 * case, we know there are no nodes left if the action
580 * is MOD_UNLOAD, so there's no need to detach any nodes.
582 * XXX: what about manual unloads?!?
585 /* Unregister function hooks */
586 ng_gif_attach_p = NULL;
587 ng_gif_detach_p = NULL;
588 ng_gif_input_p = NULL;
589 ng_gif_input_orphan_p = NULL;