1 /* $Id: divert_procfs.c,v 1.11.6.2 2001/09/23 22:24:36 kai Exp $
2 *
3 * Filesystem handling for the diversion supplementary services.
4 *
5 * Copyright 1998 by Werner Cornelius (werner@isdn4linux.de)
6 *
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
9 *
10 */
11
12 #include <linux/module.h>
13 #include <linux/poll.h>
14 #ifdef CONFIG_PROC_FS
15 #include <linux/proc_fs.h>
16 #else
17 #include <linux/fs.h>
18 #endif
19 #include <linux/isdnif.h>
20 #include <net/net_namespace.h>
21 #include "isdn_divert.h"
22
23
24 /*********************************/
25 /* Variables for interface queue */
26 /*********************************/
27 ulong if_used = 0; /* number of interface users */
28 static struct divert_info *divert_info_head = NULL; /* head of queue */
29 static struct divert_info *divert_info_tail = NULL; /* pointer to last entry */
30 static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
31 static wait_queue_head_t rd_queue;
32
33 /*********************************/
34 /* put an info buffer into queue */
35 /*********************************/
36 void
37 put_info_buffer(char *cp)
38 {
39 struct divert_info *ib;
40 unsigned long flags;
41
42 if (if_used <= 0)
43 return;
44 if (!cp)
45 return;
46 if (!*cp)
47 return;
48 if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
49 return; /* no memory */
50 strcpy(ib->info_start, cp); /* set output string */
51 ib->next = NULL;
52 spin_lock_irqsave( &divert_info_lock, flags );
53 ib->usage_cnt = if_used;
54 if (!divert_info_head)
55 divert_info_head = ib; /* new head */
56 else
57 divert_info_tail->next = ib; /* follows existing messages */
58 divert_info_tail = ib; /* new tail */
59
60 /* delete old entrys */
61 while (divert_info_head->next) {
62 if ((divert_info_head->usage_cnt <= 0) &&
63 (divert_info_head->next->usage_cnt <= 0)) {
64 ib = divert_info_head;
65 divert_info_head = divert_info_head->next;
66 kfree(ib);
67 } else
68 break;
69 } /* divert_info_head->next */
70 spin_unlock_irqrestore( &divert_info_lock, flags );
71 wake_up_interruptible(&(rd_queue));
72 } /* put_info_buffer */
73
74 #ifdef CONFIG_PROC_FS
75
76 /**********************************/
77 /* deflection device read routine */
78 /**********************************/
79 static ssize_t
80 isdn_divert_read(struct file *file, char __user *buf, size_t count, loff_t * off)
81 {
82 struct divert_info *inf;
83 int len;
84
85 if (!*((struct divert_info **) file->private_data)) {
86 if (file->f_flags & O_NONBLOCK)
87 return -EAGAIN;
88 interruptible_sleep_on(&(rd_queue));
89 }
90 if (!(inf = *((struct divert_info **) file->private_data)))
91 return (0);
92
93 inf->usage_cnt--; /* new usage count */
94 file->private_data = &inf->next; /* next structure */
95 if ((len = strlen(inf->info_start)) <= count) {
96 if (copy_to_user(buf, inf->info_start, len))
97 return -EFAULT;
98 *off += len;
99 return (len);
100 }
101 return (0);
102 } /* isdn_divert_read */
103
104 /**********************************/
105 /* deflection device write routine */
106 /**********************************/
107 static ssize_t
108 isdn_divert_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
109 {
110 return (-ENODEV);
111 } /* isdn_divert_write */
112
113
114 /***************************************/
115 /* select routines for various kernels */
116 /***************************************/
117 static unsigned int
118 isdn_divert_poll(struct file *file, poll_table * wait)
119 {
120 unsigned int mask = 0;
121
122 poll_wait(file, &(rd_queue), wait);
123 /* mask = POLLOUT | POLLWRNORM; */
124 if (*((struct divert_info **) file->private_data)) {
125 mask |= POLLIN | POLLRDNORM;
126 }
127 return mask;
128 } /* isdn_divert_poll */
129
130 /****************/
131 /* Open routine */
132 /****************/
133 static int
134 isdn_divert_open(struct inode *ino, struct file *filep)
135 {
136 unsigned long flags;
137
138 spin_lock_irqsave( &divert_info_lock, flags );
139 if_used++;
140 if (divert_info_head)
141 filep->private_data = &(divert_info_tail->next);
142 else
143 filep->private_data = &divert_info_head;
144 spin_unlock_irqrestore( &divert_info_lock, flags );
145 /* start_divert(); */
146 return nonseekable_open(ino, filep);
147 } /* isdn_divert_open */
148
149 /*******************/
150 /* close routine */
151 /*******************/
152 static int
153 isdn_divert_close(struct inode *ino, struct file *filep)
154 {
155 struct divert_info *inf;
156 unsigned long flags;
157
158 spin_lock_irqsave( &divert_info_lock, flags );
159 if_used--;
160 inf = *((struct divert_info **) filep->private_data);
161 while (inf) {
162 inf->usage_cnt--;
163 inf = inf->next;
164 }
165 if (if_used <= 0)
166 while (divert_info_head) {
167 inf = divert_info_head;
168 divert_info_head = divert_info_head->next;
169 kfree(inf);
170 }
171 spin_unlock_irqrestore( &divert_info_lock, flags );
172 return (0);
173 } /* isdn_divert_close */
174
175 /*********/
176 /* IOCTL */
177 /*********/
178 static int
179 isdn_divert_ioctl(struct inode *inode, struct file *file,
180 uint cmd, ulong arg)
181 {
182 divert_ioctl dioctl;
183 int i;
184 unsigned long flags;
185 divert_rule *rulep;
186 char *cp;
187
188 if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
189 return -EFAULT;
190
191 switch (cmd) {
192 case IIOCGETVER:
193 dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */
194 break;
195
196 case IIOCGETDRV:
197 if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
198 return (-EINVAL);
199 break;
200
201 case IIOCGETNAM:
202 cp = divert_if.drv_to_name(dioctl.getid.drvid);
203 if (!cp)
204 return (-EINVAL);
205 if (!*cp)
206 return (-EINVAL);
207 strcpy(dioctl.getid.drvnam, cp);
208 break;
209
210 case IIOCGETRULE:
211 if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
212 return (-EINVAL);
213 dioctl.getsetrule.rule = *rulep; /* copy data */
214 break;
215
216 case IIOCMODRULE:
217 if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
218 return (-EINVAL);
219 spin_lock_irqsave(&divert_lock, flags);
220 *rulep = dioctl.getsetrule.rule; /* copy data */
221 spin_unlock_irqrestore(&divert_lock, flags);
222 return (0); /* no copy required */
223 break;
224
225 case IIOCINSRULE:
226 return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
227 break;
228
229 case IIOCDELRULE:
230 return (deleterule(dioctl.getsetrule.ruleidx));
231 break;
232
233 case IIOCDODFACT:
234 return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
235 dioctl.fwd_ctrl.callid,
236 dioctl.fwd_ctrl.to_nr));
237
238 case IIOCDOCFACT:
239 case IIOCDOCFDIS:
240 case IIOCDOCFINT:
241 if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
242 return (-EINVAL); /* invalid driver */
243 if ((i = cf_command(dioctl.cf_ctrl.drvid,
244 (cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
245 dioctl.cf_ctrl.cfproc,
246 dioctl.cf_ctrl.msn,
247 dioctl.cf_ctrl.service,
248 dioctl.cf_ctrl.fwd_nr,
249 &dioctl.cf_ctrl.procid)))
250 return (i);
251 break;
252
253 default:
254 return (-EINVAL);
255 } /* switch cmd */
256 return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
257 } /* isdn_divert_ioctl */
258
259 static const struct file_operations isdn_fops =
260 {
261 .owner = THIS_MODULE,
262 .llseek = no_llseek,
263 .read = isdn_divert_read,
264 .write = isdn_divert_write,
265 .poll = isdn_divert_poll,
266 .ioctl = isdn_divert_ioctl,
267 .open = isdn_divert_open,
268 .release = isdn_divert_close,
269 };
270
271 /****************************/
272 /* isdn subdir in /proc/net */
273 /****************************/
274 static struct proc_dir_entry *isdn_proc_entry = NULL;
275 static struct proc_dir_entry *isdn_divert_entry = NULL;
276 #endif /* CONFIG_PROC_FS */
277
278 /***************************************************************************/
279 /* divert_dev_init must be called before the proc filesystem may be used */
280 /***************************************************************************/
281 int
282 divert_dev_init(void)
283 {
284
285 init_waitqueue_head(&rd_queue);
286
287 #ifdef CONFIG_PROC_FS
288 isdn_proc_entry = proc_mkdir("isdn", init_net.proc_net);
289 if (!isdn_proc_entry)
290 return (-1);
291 isdn_divert_entry = create_proc_entry("divert", S_IFREG | S_IRUGO, isdn_proc_entry);
292 if (!isdn_divert_entry) {
293 remove_proc_entry("isdn", init_net.proc_net);
294 return (-1);
295 }
296 isdn_divert_entry->proc_fops = &isdn_fops;
297 isdn_divert_entry->owner = THIS_MODULE;
298 #endif /* CONFIG_PROC_FS */
299
300 return (0);
301 } /* divert_dev_init */
302
303 /***************************************************************************/
304 /* divert_dev_deinit must be called before leaving isdn when included as */
305 /* a module. */
306 /***************************************************************************/
307 int
308 divert_dev_deinit(void)
309 {
310
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 */
315
316 return (0);
317 } /* divert_dev_deinit */
318
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