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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> |
1da177e4 LT |
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> | |
457c4cbc | 20 | #include <net/net_namespace.h> |
1da177e4 LT |
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; | |
5cbded58 | 48 | if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC))) |
1da177e4 LT |
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 | ||
732781da CS |
74 | #ifdef CONFIG_PROC_FS |
75 | ||
1da177e4 LT |
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 | ||
2b8693c0 | 259 | static const struct file_operations isdn_fops = |
1da177e4 LT |
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 | |
457c4cbc | 288 | isdn_proc_entry = proc_mkdir("isdn", init_net.proc_net); |
1da177e4 LT |
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) { | |
457c4cbc | 293 | remove_proc_entry("isdn", init_net.proc_net); |
1da177e4 LT |
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); | |
457c4cbc | 313 | remove_proc_entry("isdn", init_net.proc_net); |
1da177e4 LT |
314 | #endif /* CONFIG_PROC_FS */ |
315 | ||
316 | return (0); | |
317 | } /* divert_dev_deinit */ |