1 /* $Id: divert_procfs.c,v 1.11.6.2 2001/09/23 22:24:36 kai Exp $
3 * Filesystem handling for the diversion supplementary services.
5 * Copyright 1998 by Werner Cornelius (werner@isdn4linux.de)
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
12 #include <linux/module.h>
13 #include <linux/poll.h>
14 #include <linux/slab.h>
16 #include <linux/proc_fs.h>
20 #include <linux/sched.h>
21 #include <linux/isdnif.h>
22 #include <net/net_namespace.h>
23 #include <linux/mutex.h>
24 #include "isdn_divert.h"
27 /*********************************/
28 /* Variables for interface queue */
29 /*********************************/
30 ulong if_used = 0; /* number of interface users */
31 static DEFINE_MUTEX(isdn_divert_mutex);
32 static struct divert_info *divert_info_head = NULL; /* head of queue */
33 static struct divert_info *divert_info_tail = NULL; /* pointer to last entry */
34 static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
35 static wait_queue_head_t rd_queue;
37 /*********************************/
38 /* put an info buffer into queue */
39 /*********************************/
41 put_info_buffer(char *cp)
43 struct divert_info *ib;
52 if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
53 return; /* no memory */
54 strcpy(ib->info_start, cp); /* set output string */
56 spin_lock_irqsave(&divert_info_lock, flags);
57 ib->usage_cnt = if_used;
58 if (!divert_info_head)
59 divert_info_head = ib; /* new head */
61 divert_info_tail->next = ib; /* follows existing messages */
62 divert_info_tail = ib; /* new tail */
64 /* delete old entrys */
65 while (divert_info_head->next) {
66 if ((divert_info_head->usage_cnt <= 0) &&
67 (divert_info_head->next->usage_cnt <= 0)) {
68 ib = divert_info_head;
69 divert_info_head = divert_info_head->next;
73 } /* divert_info_head->next */
74 spin_unlock_irqrestore(&divert_info_lock, flags);
75 wake_up_interruptible(&(rd_queue));
76 } /* put_info_buffer */
80 /**********************************/
81 /* deflection device read routine */
82 /**********************************/
84 isdn_divert_read(struct file *file, char __user *buf, size_t count, loff_t *off)
86 struct divert_info *inf;
89 if (!*((struct divert_info **) file->private_data)) {
90 if (file->f_flags & O_NONBLOCK)
92 interruptible_sleep_on(&(rd_queue));
94 if (!(inf = *((struct divert_info **) file->private_data)))
97 inf->usage_cnt--; /* new usage count */
98 file->private_data = &inf->next; /* next structure */
99 if ((len = strlen(inf->info_start)) <= count) {
100 if (copy_to_user(buf, inf->info_start, len))
106 } /* isdn_divert_read */
108 /**********************************/
109 /* deflection device write routine */
110 /**********************************/
112 isdn_divert_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
115 } /* isdn_divert_write */
118 /***************************************/
119 /* select routines for various kernels */
120 /***************************************/
122 isdn_divert_poll(struct file *file, poll_table *wait)
124 unsigned int mask = 0;
126 poll_wait(file, &(rd_queue), wait);
127 /* mask = POLLOUT | POLLWRNORM; */
128 if (*((struct divert_info **) file->private_data)) {
129 mask |= POLLIN | POLLRDNORM;
132 } /* isdn_divert_poll */
138 isdn_divert_open(struct inode *ino, struct file *filep)
142 spin_lock_irqsave(&divert_info_lock, flags);
144 if (divert_info_head)
145 filep->private_data = &(divert_info_tail->next);
147 filep->private_data = &divert_info_head;
148 spin_unlock_irqrestore(&divert_info_lock, flags);
149 /* start_divert(); */
150 return nonseekable_open(ino, filep);
151 } /* isdn_divert_open */
153 /*******************/
155 /*******************/
157 isdn_divert_close(struct inode *ino, struct file *filep)
159 struct divert_info *inf;
162 spin_lock_irqsave(&divert_info_lock, flags);
164 inf = *((struct divert_info **) filep->private_data);
170 while (divert_info_head) {
171 inf = divert_info_head;
172 divert_info_head = divert_info_head->next;
175 spin_unlock_irqrestore(&divert_info_lock, flags);
177 } /* isdn_divert_close */
182 static int isdn_divert_ioctl_unlocked(struct file *file, uint cmd, ulong arg)
190 if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
195 dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */
199 if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
204 cp = divert_if.drv_to_name(dioctl.getid.drvid);
209 strcpy(dioctl.getid.drvnam, cp);
213 if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
215 dioctl.getsetrule.rule = *rulep; /* copy data */
219 if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
221 spin_lock_irqsave(&divert_lock, flags);
222 *rulep = dioctl.getsetrule.rule; /* copy data */
223 spin_unlock_irqrestore(&divert_lock, flags);
224 return (0); /* no copy required */
228 return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
232 return (deleterule(dioctl.getsetrule.ruleidx));
236 return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
237 dioctl.fwd_ctrl.callid,
238 dioctl.fwd_ctrl.to_nr));
243 if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
244 return (-EINVAL); /* invalid driver */
245 if (strnlen(dioctl.cf_ctrl.msn, sizeof(dioctl.cf_ctrl.msn)) ==
246 sizeof(dioctl.cf_ctrl.msn))
248 if (strnlen(dioctl.cf_ctrl.fwd_nr, sizeof(dioctl.cf_ctrl.fwd_nr)) ==
249 sizeof(dioctl.cf_ctrl.fwd_nr))
251 if ((i = cf_command(dioctl.cf_ctrl.drvid,
252 (cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
253 dioctl.cf_ctrl.cfproc,
255 dioctl.cf_ctrl.service,
256 dioctl.cf_ctrl.fwd_nr,
257 &dioctl.cf_ctrl.procid)))
264 return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
265 } /* isdn_divert_ioctl */
267 static long isdn_divert_ioctl(struct file *file, uint cmd, ulong arg)
271 mutex_lock(&isdn_divert_mutex);
272 ret = isdn_divert_ioctl_unlocked(file, cmd, arg);
273 mutex_unlock(&isdn_divert_mutex);
278 static const struct file_operations isdn_fops =
280 .owner = THIS_MODULE,
282 .read = isdn_divert_read,
283 .write = isdn_divert_write,
284 .poll = isdn_divert_poll,
285 .unlocked_ioctl = isdn_divert_ioctl,
286 .open = isdn_divert_open,
287 .release = isdn_divert_close,
290 /****************************/
291 /* isdn subdir in /proc/net */
292 /****************************/
293 static struct proc_dir_entry *isdn_proc_entry = NULL;
294 static struct proc_dir_entry *isdn_divert_entry = NULL;
295 #endif /* CONFIG_PROC_FS */
297 /***************************************************************************/
298 /* divert_dev_init must be called before the proc filesystem may be used */
299 /***************************************************************************/
301 divert_dev_init(void)
304 init_waitqueue_head(&rd_queue);
306 #ifdef CONFIG_PROC_FS
307 isdn_proc_entry = proc_mkdir("isdn", init_net.proc_net);
308 if (!isdn_proc_entry)
310 isdn_divert_entry = proc_create("divert", S_IFREG | S_IRUGO,
311 isdn_proc_entry, &isdn_fops);
312 if (!isdn_divert_entry) {
313 remove_proc_entry("isdn", init_net.proc_net);
316 #endif /* CONFIG_PROC_FS */
319 } /* divert_dev_init */
321 /***************************************************************************/
322 /* divert_dev_deinit must be called before leaving isdn when included as */
324 /***************************************************************************/
326 divert_dev_deinit(void)
329 #ifdef CONFIG_PROC_FS
330 remove_proc_entry("divert", isdn_proc_entry);
331 remove_proc_entry("isdn", init_net.proc_net);
332 #endif /* CONFIG_PROC_FS */
335 } /* divert_dev_deinit */