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1da177e4 LT |
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 | ||
1da177e4 | 12 | #include <linux/module.h> |
1da177e4 | 13 | #include <linux/poll.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
1da177e4 LT |
15 | #ifdef CONFIG_PROC_FS |
16 | #include <linux/proc_fs.h> | |
17 | #else | |
18 | #include <linux/fs.h> | |
19 | #endif | |
a99bbaf5 | 20 | #include <linux/sched.h> |
1da177e4 | 21 | #include <linux/isdnif.h> |
457c4cbc | 22 | #include <net/net_namespace.h> |
d79b6f4d | 23 | #include <linux/smp_lock.h> |
1da177e4 LT |
24 | #include "isdn_divert.h" |
25 | ||
26 | ||
27 | /*********************************/ | |
28 | /* Variables for interface queue */ | |
29 | /*********************************/ | |
30 | ulong if_used = 0; /* number of interface users */ | |
31 | static struct divert_info *divert_info_head = NULL; /* head of queue */ | |
32 | static struct divert_info *divert_info_tail = NULL; /* pointer to last entry */ | |
33 | static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */ | |
34 | static wait_queue_head_t rd_queue; | |
35 | ||
36 | /*********************************/ | |
37 | /* put an info buffer into queue */ | |
38 | /*********************************/ | |
39 | void | |
40 | put_info_buffer(char *cp) | |
41 | { | |
42 | struct divert_info *ib; | |
43 | unsigned long flags; | |
44 | ||
45 | if (if_used <= 0) | |
46 | return; | |
47 | if (!cp) | |
48 | return; | |
49 | if (!*cp) | |
50 | return; | |
5cbded58 | 51 | if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC))) |
1da177e4 LT |
52 | return; /* no memory */ |
53 | strcpy(ib->info_start, cp); /* set output string */ | |
54 | ib->next = NULL; | |
55 | spin_lock_irqsave( &divert_info_lock, flags ); | |
56 | ib->usage_cnt = if_used; | |
57 | if (!divert_info_head) | |
58 | divert_info_head = ib; /* new head */ | |
59 | else | |
60 | divert_info_tail->next = ib; /* follows existing messages */ | |
61 | divert_info_tail = ib; /* new tail */ | |
62 | ||
63 | /* delete old entrys */ | |
64 | while (divert_info_head->next) { | |
65 | if ((divert_info_head->usage_cnt <= 0) && | |
66 | (divert_info_head->next->usage_cnt <= 0)) { | |
67 | ib = divert_info_head; | |
68 | divert_info_head = divert_info_head->next; | |
69 | kfree(ib); | |
70 | } else | |
71 | break; | |
72 | } /* divert_info_head->next */ | |
73 | spin_unlock_irqrestore( &divert_info_lock, flags ); | |
74 | wake_up_interruptible(&(rd_queue)); | |
75 | } /* put_info_buffer */ | |
76 | ||
732781da CS |
77 | #ifdef CONFIG_PROC_FS |
78 | ||
1da177e4 LT |
79 | /**********************************/ |
80 | /* deflection device read routine */ | |
81 | /**********************************/ | |
82 | static ssize_t | |
83 | isdn_divert_read(struct file *file, char __user *buf, size_t count, loff_t * off) | |
84 | { | |
85 | struct divert_info *inf; | |
86 | int len; | |
87 | ||
88 | if (!*((struct divert_info **) file->private_data)) { | |
89 | if (file->f_flags & O_NONBLOCK) | |
90 | return -EAGAIN; | |
91 | interruptible_sleep_on(&(rd_queue)); | |
92 | } | |
93 | if (!(inf = *((struct divert_info **) file->private_data))) | |
94 | return (0); | |
95 | ||
96 | inf->usage_cnt--; /* new usage count */ | |
97 | file->private_data = &inf->next; /* next structure */ | |
98 | if ((len = strlen(inf->info_start)) <= count) { | |
99 | if (copy_to_user(buf, inf->info_start, len)) | |
100 | return -EFAULT; | |
101 | *off += len; | |
102 | return (len); | |
103 | } | |
104 | return (0); | |
105 | } /* isdn_divert_read */ | |
106 | ||
107 | /**********************************/ | |
108 | /* deflection device write routine */ | |
109 | /**********************************/ | |
110 | static ssize_t | |
111 | isdn_divert_write(struct file *file, const char __user *buf, size_t count, loff_t * off) | |
112 | { | |
113 | return (-ENODEV); | |
114 | } /* isdn_divert_write */ | |
115 | ||
116 | ||
117 | /***************************************/ | |
118 | /* select routines for various kernels */ | |
119 | /***************************************/ | |
120 | static unsigned int | |
121 | isdn_divert_poll(struct file *file, poll_table * wait) | |
122 | { | |
123 | unsigned int mask = 0; | |
124 | ||
125 | poll_wait(file, &(rd_queue), wait); | |
126 | /* mask = POLLOUT | POLLWRNORM; */ | |
127 | if (*((struct divert_info **) file->private_data)) { | |
128 | mask |= POLLIN | POLLRDNORM; | |
129 | } | |
130 | return mask; | |
131 | } /* isdn_divert_poll */ | |
132 | ||
133 | /****************/ | |
134 | /* Open routine */ | |
135 | /****************/ | |
136 | static int | |
137 | isdn_divert_open(struct inode *ino, struct file *filep) | |
138 | { | |
139 | unsigned long flags; | |
140 | ||
141 | spin_lock_irqsave( &divert_info_lock, flags ); | |
142 | if_used++; | |
143 | if (divert_info_head) | |
144 | filep->private_data = &(divert_info_tail->next); | |
145 | else | |
146 | filep->private_data = &divert_info_head; | |
147 | spin_unlock_irqrestore( &divert_info_lock, flags ); | |
148 | /* start_divert(); */ | |
149 | return nonseekable_open(ino, filep); | |
150 | } /* isdn_divert_open */ | |
151 | ||
152 | /*******************/ | |
153 | /* close routine */ | |
154 | /*******************/ | |
155 | static int | |
156 | isdn_divert_close(struct inode *ino, struct file *filep) | |
157 | { | |
158 | struct divert_info *inf; | |
159 | unsigned long flags; | |
160 | ||
161 | spin_lock_irqsave( &divert_info_lock, flags ); | |
162 | if_used--; | |
163 | inf = *((struct divert_info **) filep->private_data); | |
164 | while (inf) { | |
165 | inf->usage_cnt--; | |
166 | inf = inf->next; | |
167 | } | |
168 | if (if_used <= 0) | |
169 | while (divert_info_head) { | |
170 | inf = divert_info_head; | |
171 | divert_info_head = divert_info_head->next; | |
172 | kfree(inf); | |
173 | } | |
174 | spin_unlock_irqrestore( &divert_info_lock, flags ); | |
175 | return (0); | |
176 | } /* isdn_divert_close */ | |
177 | ||
178 | /*********/ | |
179 | /* IOCTL */ | |
180 | /*********/ | |
d79b6f4d | 181 | static int isdn_divert_ioctl_unlocked(struct file *file, uint cmd, ulong arg) |
1da177e4 LT |
182 | { |
183 | divert_ioctl dioctl; | |
184 | int i; | |
185 | unsigned long flags; | |
186 | divert_rule *rulep; | |
187 | char *cp; | |
188 | ||
189 | if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl))) | |
190 | return -EFAULT; | |
191 | ||
192 | switch (cmd) { | |
193 | case IIOCGETVER: | |
194 | dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */ | |
195 | break; | |
196 | ||
197 | case IIOCGETDRV: | |
198 | if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0) | |
199 | return (-EINVAL); | |
200 | break; | |
201 | ||
202 | case IIOCGETNAM: | |
203 | cp = divert_if.drv_to_name(dioctl.getid.drvid); | |
204 | if (!cp) | |
205 | return (-EINVAL); | |
206 | if (!*cp) | |
207 | return (-EINVAL); | |
208 | strcpy(dioctl.getid.drvnam, cp); | |
209 | break; | |
210 | ||
211 | case IIOCGETRULE: | |
212 | if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx))) | |
213 | return (-EINVAL); | |
214 | dioctl.getsetrule.rule = *rulep; /* copy data */ | |
215 | break; | |
216 | ||
217 | case IIOCMODRULE: | |
218 | if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx))) | |
219 | return (-EINVAL); | |
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 */ | |
224 | break; | |
225 | ||
226 | case IIOCINSRULE: | |
227 | return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule)); | |
228 | break; | |
229 | ||
230 | case IIOCDELRULE: | |
231 | return (deleterule(dioctl.getsetrule.ruleidx)); | |
232 | break; | |
233 | ||
234 | case IIOCDODFACT: | |
235 | return (deflect_extern_action(dioctl.fwd_ctrl.subcmd, | |
236 | dioctl.fwd_ctrl.callid, | |
237 | dioctl.fwd_ctrl.to_nr)); | |
238 | ||
239 | case IIOCDOCFACT: | |
240 | case IIOCDOCFDIS: | |
241 | case IIOCDOCFINT: | |
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, | |
247 | dioctl.cf_ctrl.msn, | |
248 | dioctl.cf_ctrl.service, | |
249 | dioctl.cf_ctrl.fwd_nr, | |
250 | &dioctl.cf_ctrl.procid))) | |
251 | return (i); | |
252 | break; | |
253 | ||
254 | default: | |
255 | return (-EINVAL); | |
256 | } /* switch cmd */ | |
257 | return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0; | |
258 | } /* isdn_divert_ioctl */ | |
259 | ||
d79b6f4d FW |
260 | static long isdn_divert_ioctl(struct file *file, uint cmd, ulong arg) |
261 | { | |
262 | long ret; | |
263 | ||
264 | lock_kernel(); | |
265 | ret = isdn_divert_ioctl_unlocked(file, cmd, arg); | |
266 | unlock_kernel(); | |
267 | ||
268 | return ret; | |
269 | } | |
270 | ||
2b8693c0 | 271 | static const struct file_operations isdn_fops = |
1da177e4 LT |
272 | { |
273 | .owner = THIS_MODULE, | |
274 | .llseek = no_llseek, | |
275 | .read = isdn_divert_read, | |
276 | .write = isdn_divert_write, | |
277 | .poll = isdn_divert_poll, | |
d79b6f4d | 278 | .unlocked_ioctl = isdn_divert_ioctl, |
1da177e4 LT |
279 | .open = isdn_divert_open, |
280 | .release = isdn_divert_close, | |
281 | }; | |
282 | ||
283 | /****************************/ | |
284 | /* isdn subdir in /proc/net */ | |
285 | /****************************/ | |
286 | static struct proc_dir_entry *isdn_proc_entry = NULL; | |
287 | static struct proc_dir_entry *isdn_divert_entry = NULL; | |
288 | #endif /* CONFIG_PROC_FS */ | |
289 | ||
290 | /***************************************************************************/ | |
291 | /* divert_dev_init must be called before the proc filesystem may be used */ | |
292 | /***************************************************************************/ | |
293 | int | |
294 | divert_dev_init(void) | |
295 | { | |
296 | ||
297 | init_waitqueue_head(&rd_queue); | |
298 | ||
299 | #ifdef CONFIG_PROC_FS | |
457c4cbc | 300 | isdn_proc_entry = proc_mkdir("isdn", init_net.proc_net); |
1da177e4 LT |
301 | if (!isdn_proc_entry) |
302 | return (-1); | |
ac41cfd1 DL |
303 | isdn_divert_entry = proc_create("divert", S_IFREG | S_IRUGO, |
304 | isdn_proc_entry, &isdn_fops); | |
1da177e4 | 305 | if (!isdn_divert_entry) { |
457c4cbc | 306 | remove_proc_entry("isdn", init_net.proc_net); |
1da177e4 LT |
307 | return (-1); |
308 | } | |
1da177e4 LT |
309 | #endif /* CONFIG_PROC_FS */ |
310 | ||
311 | return (0); | |
312 | } /* divert_dev_init */ | |
313 | ||
314 | /***************************************************************************/ | |
315 | /* divert_dev_deinit must be called before leaving isdn when included as */ | |
316 | /* a module. */ | |
317 | /***************************************************************************/ | |
318 | int | |
319 | divert_dev_deinit(void) | |
320 | { | |
321 | ||
322 | #ifdef CONFIG_PROC_FS | |
323 | remove_proc_entry("divert", isdn_proc_entry); | |
457c4cbc | 324 | remove_proc_entry("isdn", init_net.proc_net); |
1da177e4 LT |
325 | #endif /* CONFIG_PROC_FS */ |
326 | ||
327 | return (0); | |
328 | } /* divert_dev_deinit */ |