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>
15 #include <linux/proc_fs.h>
19 #include <linux/sched.h>
20 #include <linux/isdnif.h>
21 #include <net/net_namespace.h>
22 #include "isdn_divert.h"
25 /*********************************/
26 /* Variables for interface queue */
27 /*********************************/
28 ulong if_used = 0; /* number of interface users */
29 static struct divert_info *divert_info_head = NULL; /* head of queue */
30 static struct divert_info *divert_info_tail = NULL; /* pointer to last entry */
31 static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
32 static wait_queue_head_t rd_queue;
34 /*********************************/
35 /* put an info buffer into queue */
36 /*********************************/
38 put_info_buffer(char *cp)
40 struct divert_info *ib;
49 if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
50 return; /* no memory */
51 strcpy(ib->info_start, cp); /* set output string */
53 spin_lock_irqsave( &divert_info_lock, flags );
54 ib->usage_cnt = if_used;
55 if (!divert_info_head)
56 divert_info_head = ib; /* new head */
58 divert_info_tail->next = ib; /* follows existing messages */
59 divert_info_tail = ib; /* new tail */
61 /* delete old entrys */
62 while (divert_info_head->next) {
63 if ((divert_info_head->usage_cnt <= 0) &&
64 (divert_info_head->next->usage_cnt <= 0)) {
65 ib = divert_info_head;
66 divert_info_head = divert_info_head->next;
70 } /* divert_info_head->next */
71 spin_unlock_irqrestore( &divert_info_lock, flags );
72 wake_up_interruptible(&(rd_queue));
73 } /* put_info_buffer */
77 /**********************************/
78 /* deflection device read routine */
79 /**********************************/
81 isdn_divert_read(struct file *file, char __user *buf, size_t count, loff_t * off)
83 struct divert_info *inf;
86 if (!*((struct divert_info **) file->private_data)) {
87 if (file->f_flags & O_NONBLOCK)
89 interruptible_sleep_on(&(rd_queue));
91 if (!(inf = *((struct divert_info **) file->private_data)))
94 inf->usage_cnt--; /* new usage count */
95 file->private_data = &inf->next; /* next structure */
96 if ((len = strlen(inf->info_start)) <= count) {
97 if (copy_to_user(buf, inf->info_start, len))
103 } /* isdn_divert_read */
105 /**********************************/
106 /* deflection device write routine */
107 /**********************************/
109 isdn_divert_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
112 } /* isdn_divert_write */
115 /***************************************/
116 /* select routines for various kernels */
117 /***************************************/
119 isdn_divert_poll(struct file *file, poll_table * wait)
121 unsigned int mask = 0;
123 poll_wait(file, &(rd_queue), wait);
124 /* mask = POLLOUT | POLLWRNORM; */
125 if (*((struct divert_info **) file->private_data)) {
126 mask |= POLLIN | POLLRDNORM;
129 } /* isdn_divert_poll */
135 isdn_divert_open(struct inode *ino, struct file *filep)
139 spin_lock_irqsave( &divert_info_lock, flags );
141 if (divert_info_head)
142 filep->private_data = &(divert_info_tail->next);
144 filep->private_data = &divert_info_head;
145 spin_unlock_irqrestore( &divert_info_lock, flags );
146 /* start_divert(); */
147 return nonseekable_open(ino, filep);
148 } /* isdn_divert_open */
150 /*******************/
152 /*******************/
154 isdn_divert_close(struct inode *ino, struct file *filep)
156 struct divert_info *inf;
159 spin_lock_irqsave( &divert_info_lock, flags );
161 inf = *((struct divert_info **) filep->private_data);
167 while (divert_info_head) {
168 inf = divert_info_head;
169 divert_info_head = divert_info_head->next;
172 spin_unlock_irqrestore( &divert_info_lock, flags );
174 } /* isdn_divert_close */
180 isdn_divert_ioctl(struct inode *inode, struct file *file,
189 if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
194 dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */
198 if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
203 cp = divert_if.drv_to_name(dioctl.getid.drvid);
208 strcpy(dioctl.getid.drvnam, cp);
212 if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
214 dioctl.getsetrule.rule = *rulep; /* copy data */
218 if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
220 spin_lock_irqsave(&divert_lock, flags);
221 *rulep = dioctl.getsetrule.rule; /* copy data */
222 spin_unlock_irqrestore(&divert_lock, flags);
223 return (0); /* no copy required */
227 return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
231 return (deleterule(dioctl.getsetrule.ruleidx));
235 return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
236 dioctl.fwd_ctrl.callid,
237 dioctl.fwd_ctrl.to_nr));
242 if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
243 return (-EINVAL); /* invalid driver */
244 if ((i = cf_command(dioctl.cf_ctrl.drvid,
245 (cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
246 dioctl.cf_ctrl.cfproc,
248 dioctl.cf_ctrl.service,
249 dioctl.cf_ctrl.fwd_nr,
250 &dioctl.cf_ctrl.procid)))
257 return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
258 } /* isdn_divert_ioctl */
260 static const struct file_operations isdn_fops =
262 .owner = THIS_MODULE,
264 .read = isdn_divert_read,
265 .write = isdn_divert_write,
266 .poll = isdn_divert_poll,
267 .ioctl = isdn_divert_ioctl,
268 .open = isdn_divert_open,
269 .release = isdn_divert_close,
272 /****************************/
273 /* isdn subdir in /proc/net */
274 /****************************/
275 static struct proc_dir_entry *isdn_proc_entry = NULL;
276 static struct proc_dir_entry *isdn_divert_entry = NULL;
277 #endif /* CONFIG_PROC_FS */
279 /***************************************************************************/
280 /* divert_dev_init must be called before the proc filesystem may be used */
281 /***************************************************************************/
283 divert_dev_init(void)
286 init_waitqueue_head(&rd_queue);
288 #ifdef CONFIG_PROC_FS
289 isdn_proc_entry = proc_mkdir("isdn", init_net.proc_net);
290 if (!isdn_proc_entry)
292 isdn_divert_entry = proc_create("divert", S_IFREG | S_IRUGO,
293 isdn_proc_entry, &isdn_fops);
294 if (!isdn_divert_entry) {
295 remove_proc_entry("isdn", init_net.proc_net);
298 #endif /* CONFIG_PROC_FS */
301 } /* divert_dev_init */
303 /***************************************************************************/
304 /* divert_dev_deinit must be called before leaving isdn when included as */
306 /***************************************************************************/
308 divert_dev_deinit(void)
311 #ifdef CONFIG_PROC_FS
312 remove_proc_entry("divert", isdn_proc_entry);
313 remove_proc_entry("isdn", init_net.proc_net);
314 #endif /* CONFIG_PROC_FS */
317 } /* divert_dev_deinit */