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65 * $FreeBSD: src/sys/netgraph/ng_gif.c,v 1.19 2005/06/10 16:49:21 brooks Exp $
66 * $DragonFly: src/sys/netgraph7/ng_gif.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
70 * ng_gif(4) netgraph node type
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/kernel.h>
76 #include <sys/malloc.h>
78 #include <sys/errno.h>
79 #include <sys/syslog.h>
80 #include <sys/socket.h>
83 #include <net/route.h>
84 #include <net/if_types.h>
85 #include <net/if_var.h>
86 #include <net/if_gif.h>
88 #include "ng_message.h"
93 #define IFP2NG(ifp) ((struct ng_node *)((struct gif_softc *)(ifp->if_softc))->gif_netgraph)
94 #define IFP2NG_SET(ifp, val) (((struct gif_softc *)(ifp->if_softc))->gif_netgraph = (val))
96 /* Per-node private data */
98 struct ifnet *ifp; /* associated interface */
99 hook_p lower; /* lower OR orphan hook connection */
100 u_char lowerOrphan; /* whether lower is lower or orphan */
102 typedef struct private *priv_p;
104 /* Functional hooks called from if_gif.c */
105 static void ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af);
106 static void ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af);
107 static void ng_gif_attach(struct ifnet *ifp);
108 static void ng_gif_detach(struct ifnet *ifp);
110 /* Other functions */
111 static void ng_gif_input2(node_p node, struct mbuf **mp, int af);
112 static int ng_gif_glue_af(struct mbuf **mp, int af);
113 static int ng_gif_rcv_lower(node_p node, struct mbuf *m);
115 /* Netgraph node methods */
116 static ng_constructor_t ng_gif_constructor;
117 static ng_rcvmsg_t ng_gif_rcvmsg;
118 static ng_shutdown_t ng_gif_shutdown;
119 static ng_newhook_t ng_gif_newhook;
120 static ng_connect_t ng_gif_connect;
121 static ng_rcvdata_t ng_gif_rcvdata;
122 static ng_disconnect_t ng_gif_disconnect;
123 static int ng_gif_mod_event(module_t mod, int event, void *data);
125 /* List of commands and how to convert arguments to/from ASCII */
126 static const struct ng_cmdlist ng_gif_cmdlist[] = {
132 &ng_parse_string_type
144 static struct ng_type ng_gif_typestruct = {
145 .version = NG_ABI_VERSION,
146 .name = NG_GIF_NODE_TYPE,
147 .mod_event = ng_gif_mod_event,
148 .constructor = ng_gif_constructor,
149 .rcvmsg = ng_gif_rcvmsg,
150 .shutdown = ng_gif_shutdown,
151 .newhook = ng_gif_newhook,
152 .connect = ng_gif_connect,
153 .rcvdata = ng_gif_rcvdata,
154 .disconnect = ng_gif_disconnect,
155 .cmdlist = ng_gif_cmdlist,
157 MODULE_DEPEND(ng_gif, if_gif, 1,1,1);
158 NETGRAPH_INIT(gif, &ng_gif_typestruct);
160 /******************************************************************
162 ******************************************************************/
165 * Handle a packet that has come in on an interface. We get to
166 * look at it here before any upper layer protocols do.
168 * NOTE: this function will get called at splimp()
171 ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af)
173 const node_p node = IFP2NG(ifp);
174 const priv_p priv = NG_NODE_PRIVATE(node);
176 /* If "lower" hook not connected, let packet continue */
177 if (priv->lower == NULL || priv->lowerOrphan)
179 ng_gif_input2(node, mp, af);
183 * Handle a packet that has come in on an interface, and which
184 * does not match any of our known protocols (an ``orphan'').
186 * NOTE: this function will get called at splimp()
189 ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af)
191 const node_p node = IFP2NG(ifp);
192 const priv_p priv = NG_NODE_PRIVATE(node);
194 /* If "orphan" hook not connected, let packet continue */
195 if (priv->lower == NULL || !priv->lowerOrphan) {
199 ng_gif_input2(node, &m, af);
205 * Handle a packet that has come in on a gif interface.
206 * Attach the address family to the mbuf for later use.
208 * NOTE: this function will get called at splimp()
211 ng_gif_input2(node_p node, struct mbuf **mp, int af)
213 const priv_p priv = NG_NODE_PRIVATE(node);
216 /* Glue address family on */
217 if ((error = ng_gif_glue_af(mp, af)) != 0)
220 /* Send out lower/orphan hook */
221 NG_SEND_DATA_ONLY(error, priv->lower, *mp);
226 * A new gif interface has been attached.
227 * Create a new node for it, etc.
230 ng_gif_attach(struct ifnet *ifp)
236 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
237 if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) {
238 log(LOG_ERR, "%s: can't %s for %s\n",
239 __func__, "create node", ifp->if_xname);
243 /* Allocate private data */
244 priv = kmalloc(sizeof(*priv), M_NETGRAPH,
245 M_WAITOK | M_NULLOK | M_ZERO);
247 log(LOG_ERR, "%s: can't %s for %s\n",
248 __func__, "allocate memory", ifp->if_xname);
252 NG_NODE_SET_PRIVATE(node, priv);
254 IFP2NG_SET(ifp, node);
256 /* Try to give the node the same name as the interface */
257 if (ng_name_node(node, ifp->if_xname) != 0) {
258 log(LOG_WARNING, "%s: can't name node %s\n",
259 __func__, ifp->if_xname);
264 * An interface is being detached.
265 * REALLY Destroy its node.
268 ng_gif_detach(struct ifnet *ifp)
270 const node_p node = IFP2NG(ifp);
273 if (node == NULL) /* no node (why not?), ignore */
275 priv = NG_NODE_PRIVATE(node);
276 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
278 * We can't assume the ifnet is still around when we run shutdown
279 * So zap it now. XXX We HOPE that anything running at this time
280 * handles it (as it should in the non netgraph case).
282 IFP2NG_SET(ifp, NULL);
283 priv->ifp = NULL; /* XXX race if interrupted an output packet */
284 ng_rmnode_self(node); /* remove all netgraph parts */
288 * Optimization for gluing the address family onto
289 * the front of an incoming packet.
292 ng_gif_glue_af(struct mbuf **mp, int af)
294 struct mbuf *m = *mp;
298 tmp_af = (sa_family_t) af;
301 * XXX: should try to bring back some of the optimizations from
306 * Doing anything more is likely to get more
307 * expensive than it's worth..
308 * it's probable that everything else is in one
309 * big lump. The next node will do an m_pullup()
310 * for exactly the amount of data it needs and
311 * hopefully everything after that will not
312 * need one. So let's just use M_PREPEND.
314 M_PREPEND(m, sizeof (tmp_af), MB_DONTWAIT);
323 /* Copy header and return (possibly new) mbuf */
324 *mtod(m, sa_family_t *) = tmp_af;
326 bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af));
333 /******************************************************************
334 NETGRAPH NODE METHODS
335 ******************************************************************/
338 * It is not possible or allowable to create a node of this type.
339 * Nodes get created when the interface is attached (or, when
340 * this node type's KLD is loaded).
343 ng_gif_constructor(node_p node)
349 * Check for attaching a new hook.
352 ng_gif_newhook(node_p node, hook_p hook, const char *name)
354 const priv_p priv = NG_NODE_PRIVATE(node);
355 u_char orphan = priv->lowerOrphan;
358 /* Divert hook is an alias for lower */
359 if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0)
360 name = NG_GIF_HOOK_LOWER;
363 if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) {
364 hookptr = &priv->lower;
366 } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) {
367 hookptr = &priv->lower;
372 /* Check if already connected (shouldn't be, but doesn't hurt) */
373 if (*hookptr != NULL)
378 priv->lowerOrphan = orphan;
383 * Hooks are attached, adjust to force queueing.
384 * We don't really care which hook it is.
385 * they should all be queuing for outgoing data.
388 ng_gif_connect(hook_p hook)
390 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
395 * Receive an incoming control message.
398 ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook)
400 const priv_p priv = NG_NODE_PRIVATE(node);
401 struct ng_mesg *resp = NULL;
405 NGI_GET_MSG(item, msg);
406 switch (msg->header.typecookie) {
408 switch (msg->header.cmd) {
409 case NGM_GIF_GET_IFNAME:
410 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
415 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
417 case NGM_GIF_GET_IFINDEX:
418 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK);
423 *((u_int32_t *)resp->data) = priv->ifp->if_index;
434 NG_RESPOND_MSG(error, node, item, resp);
440 * Receive data on a hook.
443 ng_gif_rcvdata(hook_p hook, item_p item)
445 const node_p node = NG_HOOK_NODE(hook);
446 const priv_p priv = NG_NODE_PRIVATE(node);
452 if (hook == priv->lower)
453 return ng_gif_rcv_lower(node, m);
454 panic("%s: weird hook", __func__);
458 * Handle an mbuf received on the "lower" hook.
461 ng_gif_rcv_lower(node_p node, struct mbuf *m)
464 const priv_p priv = NG_NODE_PRIVATE(node);
466 bzero(&dst, sizeof(dst));
468 /* Make sure header is fully pulled up */
469 if (m->m_pkthdr.len < sizeof(sa_family_t)) {
473 if (m->m_len < sizeof(sa_family_t)
474 && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
478 dst.sa_family = *mtod(m, sa_family_t *);
479 m_adj(m, sizeof(sa_family_t));
481 /* Send it on its way */
483 * XXX: gif_output only uses dst for the family and passes the
484 * fourth argument (rt) to in{,6}_gif_output which ignore it.
485 * If this changes ng_gif will probably break.
487 return gif_output(priv->ifp, m, &dst, NULL);
491 * Shutdown node. This resets the node but does not remove it
492 * unless the REALLY_DIE flag is set.
495 ng_gif_shutdown(node_p node)
497 const priv_p priv = NG_NODE_PRIVATE(node);
499 if (node->nd_flags & NGF_REALLY_DIE) {
501 * WE came here because the gif interface is being destroyed,
502 * so stop being persistant.
503 * Actually undo all the things we did on creation.
504 * Assume the ifp has already been freed.
506 NG_NODE_SET_PRIVATE(node, NULL);
507 kfree(priv, M_NETGRAPH);
508 NG_NODE_UNREF(node); /* free node itself */
511 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
516 * Hook disconnection.
519 ng_gif_disconnect(hook_p hook)
521 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
523 if (hook == priv->lower) {
525 priv->lowerOrphan = 0;
527 panic("%s: weird hook", __func__);
528 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
529 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
530 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
535 /******************************************************************
537 ******************************************************************/
540 * Handle loading and unloading for this node type.
543 ng_gif_mod_event(module_t mod, int event, void *data)
553 /* Register function hooks */
554 if (ng_gif_attach_p != NULL) {
558 ng_gif_attach_p = ng_gif_attach;
559 ng_gif_detach_p = ng_gif_detach;
560 ng_gif_input_p = ng_gif_input;
561 ng_gif_input_orphan_p = ng_gif_input_orphan;
563 /* Create nodes for any already-existing gif interfaces */
565 TAILQ_FOREACH(ifp, &ifnet, if_link) {
566 if (ifp->if_type == IFT_GIF)
575 * Note that the base code won't try to unload us until
576 * all nodes have been removed, and that can't happen
577 * until all gif interfaces are destroyed. In any
578 * case, we know there are no nodes left if the action
579 * is MOD_UNLOAD, so there's no need to detach any nodes.
581 * XXX: what about manual unloads?!?
584 /* Unregister function hooks */
585 ng_gif_attach_p = NULL;
586 ng_gif_detach_p = NULL;
587 ng_gif_input_p = NULL;
588 ng_gif_input_orphan_p = NULL;