2 * ng_sppp.c Netgraph to Sppp module.
6 * Copyright (C) 2002-2004 Cronyx Engineering.
7 * Copyright (C) 2002-2004 Roman Kurakin <rik@cronyx.ru>
9 * This software is distributed with NO WARRANTIES, not even the implied
10 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 * Authors grant any other persons or organisations a permission to use,
13 * modify and redistribute this software in source and binary forms,
14 * as long as this message is kept with the software, all derivative
15 * works or modified versions.
17 * Cronyx Id: ng_sppp.c,v 1.1.2.10 2004/03/01 15:17:21 rik Exp $
19 #include <sys/cdefs.h>
20 __FBSDID("$FreeBSD$");
22 #include <sys/param.h>
23 #include <sys/systm.h>
24 #include <sys/errno.h>
25 #include <sys/kernel.h>
26 #include <sys/malloc.h>
28 #include <sys/errno.h>
29 #include <sys/sockio.h>
30 #include <sys/socket.h>
31 #include <sys/syslog.h>
32 #include <sys/libkern.h>
35 #include <net/if_var.h>
36 #include <net/if_types.h>
38 #include <net/if_sppp.h>
40 #include <netinet/in.h>
42 #include <netgraph/ng_message.h>
43 #include <netgraph/netgraph.h>
44 #include <netgraph/ng_parse.h>
45 #include <netgraph/ng_sppp.h>
47 #ifdef NG_SEPARATE_MALLOC
48 static MALLOC_DEFINE(M_NETGRAPH_SPPP, "netgraph_sppp", "netgraph sppp node");
50 #define M_NETGRAPH_SPPP M_NETGRAPH
53 /* Node private data */
54 struct ng_sppp_private {
55 struct ifnet *ifp; /* Our interface */
56 int unit; /* Interface unit number */
57 node_p node; /* Our netgraph node */
58 hook_p hook; /* Hook */
60 typedef struct ng_sppp_private *priv_p;
62 /* Interface methods */
63 static void ng_sppp_start (struct ifnet *ifp);
64 static int ng_sppp_ioctl (struct ifnet *ifp, u_long cmd, caddr_t data);
66 /* Netgraph methods */
67 static ng_constructor_t ng_sppp_constructor;
68 static ng_rcvmsg_t ng_sppp_rcvmsg;
69 static ng_shutdown_t ng_sppp_shutdown;
70 static ng_newhook_t ng_sppp_newhook;
71 static ng_rcvdata_t ng_sppp_rcvdata;
72 static ng_disconnect_t ng_sppp_disconnect;
74 /* List of commands and how to convert arguments to/from ASCII */
75 static const struct ng_cmdlist ng_sppp_cmds[] = {
86 /* Node type descriptor */
87 static struct ng_type typestruct = {
88 .version = NG_ABI_VERSION,
89 .name = NG_SPPP_NODE_TYPE,
90 .constructor = ng_sppp_constructor,
91 .rcvmsg = ng_sppp_rcvmsg,
92 .shutdown = ng_sppp_shutdown,
93 .newhook = ng_sppp_newhook,
94 .rcvdata = ng_sppp_rcvdata,
95 .disconnect = ng_sppp_disconnect,
96 .cmdlist = ng_sppp_cmds,
98 NETGRAPH_INIT(sppp, &typestruct);
100 MODULE_DEPEND (ng_sppp, sppp, 1, 1, 1);
102 /* We keep a bitmap indicating which unit numbers are free.
103 Zero means the unit number is free, one means it's taken. */
104 static unsigned char *ng_sppp_units = NULL;
105 static unsigned char ng_sppp_units_len = 0;
106 static unsigned char ng_units_in_use = 0;
109 * Find the first free unit number for a new interface.
110 * Increase the size of the unit bitmap as necessary.
113 ng_sppp_get_unit (int *unit)
118 for (index = 0; index < ng_sppp_units_len
119 && ng_sppp_units[index] == 0xFF; index++);
120 if (index == ng_sppp_units_len) { /* extend array */
121 unsigned char *newarray;
124 newlen = (2 * ng_sppp_units_len) + sizeof (*ng_sppp_units);
125 newarray = malloc (newlen * sizeof (*ng_sppp_units),
126 M_NETGRAPH_SPPP, M_WAITOK);
127 bcopy (ng_sppp_units, newarray,
128 ng_sppp_units_len * sizeof (*ng_sppp_units));
129 bzero (newarray + ng_sppp_units_len,
130 newlen - ng_sppp_units_len);
131 if (ng_sppp_units != NULL)
132 free (ng_sppp_units, M_NETGRAPH_SPPP);
133 ng_sppp_units = newarray;
134 ng_sppp_units_len = newlen;
136 mask = ng_sppp_units[index];
137 for (bit = 0; (mask & 1) != 0; bit++)
139 KASSERT ((bit >= 0 && bit < NBBY),
140 ("%s: word=%d bit=%d", __func__, ng_sppp_units[index], bit));
141 ng_sppp_units[index] |= (1 << bit);
142 *unit = (index * NBBY) + bit;
147 * Free a no longer needed unit number.
150 ng_sppp_free_unit (int unit)
156 KASSERT (index < ng_sppp_units_len,
157 ("%s: unit=%d len=%d", __func__, unit, ng_sppp_units_len));
158 KASSERT ((ng_sppp_units[index] & (1 << bit)) != 0,
159 ("%s: unit=%d is free", __func__, unit));
160 ng_sppp_units[index] &= ~(1 << bit);
163 if (ng_units_in_use == 0) {
164 free (ng_sppp_units, M_NETGRAPH_SPPP);
165 ng_sppp_units_len = 0;
166 ng_sppp_units = NULL;
170 /************************************************************************
172 ************************************************************************/
175 * Process an ioctl for the interface
178 ng_sppp_ioctl (struct ifnet *ifp, u_long command, caddr_t data)
182 error = sppp_ioctl (ifp, command, data);
190 * This routine should never be called
194 ng_sppp_start (struct ifnet *ifp)
198 priv_p priv = ifp->if_softc;
200 /* Check interface flags */
202 * This has side effects. It is not good idea to stop sending if we
203 * are not UP. If we are not running we still want to send LCP term
206 /* if (!((ifp->if_flags & IFF_UP) && */
207 /* (ifp->if_drv_flags & IFF_DRV_RUNNING))) { */
211 if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
217 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
219 while ((m = sppp_dequeue (ifp)) != NULL) {
221 len = m->m_pkthdr.len;
223 NG_SEND_DATA_ONLY (error, priv->hook, m);
226 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
230 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
233 /************************************************************************
235 ************************************************************************/
238 * Constructor for a node
241 ng_sppp_constructor (node_p node)
247 /* Allocate node and interface private structures */
248 priv = malloc(sizeof(*priv), M_NETGRAPH_SPPP, M_WAITOK | M_ZERO);
250 ifp = if_alloc(IFT_PPP);
252 free (priv, M_NETGRAPH_SPPP);
257 /* Link them together */
258 ifp->if_softc = priv;
261 /* Get an interface unit number */
262 ng_sppp_get_unit(&priv->unit);
264 /* Link together node and private info */
265 NG_NODE_SET_PRIVATE (node, priv);
268 /* Initialize interface structure */
269 if_initname (SP2IFP(pp), NG_SPPP_IFACE_NAME, priv->unit);
270 ifp->if_start = ng_sppp_start;
271 ifp->if_ioctl = ng_sppp_ioctl;
272 ifp->if_flags = (IFF_POINTOPOINT|IFF_MULTICAST);
274 /* Give this node the same name as the interface (if possible) */
275 if (ng_name_node(node, SP2IFP(pp)->if_xname) != 0)
276 log (LOG_WARNING, "%s: can't acquire netgraph name\n",
277 SP2IFP(pp)->if_xname);
279 /* Attach the interface */
282 bpfattach (ifp, DLT_NULL, sizeof(u_int32_t));
289 * Give our ok for a hook to be added
292 ng_sppp_newhook (node_p node, hook_p hook, const char *name)
294 priv_p priv = NG_NODE_PRIVATE (node);
296 if (strcmp (name, NG_SPPP_HOOK_DOWNSTREAM) != 0)
303 NG_HOOK_SET_PRIVATE (hook, priv);
309 * Receive a control message
312 ng_sppp_rcvmsg (node_p node, item_p item, hook_p lasthook)
314 const priv_p priv = NG_NODE_PRIVATE (node);
315 struct ng_mesg *msg = NULL;
316 struct ng_mesg *resp = NULL;
317 struct sppp *const pp = IFP2SP(priv->ifp);
320 NGI_GET_MSG (item, msg);
321 switch (msg->header.typecookie) {
322 case NGM_SPPP_COOKIE:
323 switch (msg->header.cmd) {
324 case NGM_SPPP_GET_IFNAME:
325 NG_MKRESPONSE (resp, msg, IFNAMSIZ, M_NOWAIT);
330 strlcpy(resp->data, SP2IFP(pp)->if_xname, IFNAMSIZ);
342 NG_RESPOND_MSG (error, node, item, resp);
348 * Recive data from a hook. Pass the packet to the correct input routine.
351 ng_sppp_rcvdata (hook_p hook, item_p item)
354 const priv_p priv = NG_NODE_PRIVATE (NG_HOOK_NODE (hook));
355 struct sppp *const pp = IFP2SP(priv->ifp);
360 KASSERT (m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__));
361 if ((SP2IFP(pp)->if_flags & IFF_UP) == 0) {
366 /* Update interface stats */
367 if_inc_counter(SP2IFP(pp), IFCOUNTER_IPACKETS, 1);
369 /* Note receiving interface */
370 m->m_pkthdr.rcvif = SP2IFP(pp);
372 /* Berkeley packet filter */
373 BPF_MTAP (SP2IFP(pp), m);
376 sppp_input (SP2IFP(pp), m);
381 * Shutdown and remove the node and its associated interface.
384 ng_sppp_shutdown (node_p node)
386 const priv_p priv = NG_NODE_PRIVATE(node);
387 /* Detach from the packet filter list of interfaces. */
388 bpfdetach (priv->ifp);
389 sppp_detach (priv->ifp);
390 if_detach (priv->ifp);
392 ng_sppp_free_unit (priv->unit);
393 free (priv, M_NETGRAPH_SPPP);
394 NG_NODE_SET_PRIVATE (node, NULL);
395 NG_NODE_UNREF (node);
400 * Hook disconnection.
403 ng_sppp_disconnect (hook_p hook)
405 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));