[NET]: Make /proc/net per network namespace
[linux-2.6] / drivers / isdn / hysdn / hysdn_procconf.c
1 /* $Id: hysdn_procconf.c,v 1.8.6.4 2001/09/23 22:24:54 kai Exp $
2  *
3  * Linux driver for HYSDN cards, /proc/net filesystem dir and conf functions.
4  *
5  * written by Werner Cornelius (werner@titro.de) for Hypercope GmbH
6  *
7  * Copyright 1999  by Werner Cornelius (werner@titro.de)
8  *
9  * This software may be used and distributed according to the terms
10  * of the GNU General Public License, incorporated herein by reference.
11  *
12  */
13
14 #include <linux/module.h>
15 #include <linux/poll.h>
16 #include <linux/proc_fs.h>
17 #include <linux/pci.h>
18 #include <linux/smp_lock.h>
19 #include <net/net_namespace.h>
20
21 #include "hysdn_defs.h"
22
23 static char *hysdn_procconf_revision = "$Revision: 1.8.6.4 $";
24
25 #define INFO_OUT_LEN 80         /* length of info line including lf */
26
27 /********************************************************/
28 /* defines and data structure for conf write operations */
29 /********************************************************/
30 #define CONF_STATE_DETECT 0     /* waiting for detect */
31 #define CONF_STATE_CONF   1     /* writing config data */
32 #define CONF_STATE_POF    2     /* writing pof data */
33 #define CONF_LINE_LEN   255     /* 255 chars max */
34
35 struct conf_writedata {
36         hysdn_card *card;       /* card the device is connected to */
37         int buf_size;           /* actual number of bytes in the buffer */
38         int needed_size;        /* needed size when reading pof */
39         int state;              /* actual interface states from above constants */
40         unsigned char conf_line[CONF_LINE_LEN]; /* buffered conf line */
41         unsigned short channel;         /* active channel number */
42         unsigned char *pof_buffer;      /* buffer when writing pof */
43 };
44
45 /***********************************************************************/
46 /* process_line parses one config line and transfers it to the card if */
47 /* necessary.                                                          */
48 /* if the return value is negative an error occurred.                   */
49 /***********************************************************************/
50 static int
51 process_line(struct conf_writedata *cnf)
52 {
53         unsigned char *cp = cnf->conf_line;
54         int i;
55
56         if (cnf->card->debug_flags & LOG_CNF_LINE)
57                 hysdn_addlog(cnf->card, "conf line: %s", cp);
58
59         if (*cp == '-') {       /* option */
60                 cp++;           /* point to option char */
61
62                 if (*cp++ != 'c')
63                         return (0);     /* option unknown or used */
64                 i = 0;          /* start value for channel */
65                 while ((*cp <= '9') && (*cp >= '0'))
66                         i = i * 10 + *cp++ - '0';       /* get decimal number */
67                 if (i > 65535) {
68                         if (cnf->card->debug_flags & LOG_CNF_MISC)
69                                 hysdn_addlog(cnf->card, "conf channel invalid  %d", i);
70                         return (-ERR_INV_CHAN);         /* invalid channel */
71                 }
72                 cnf->channel = i & 0xFFFF;      /* set new channel number */
73                 return (0);     /* success */
74         }                       /* option */
75         if (*cp == '*') {       /* line to send */
76                 if (cnf->card->debug_flags & LOG_CNF_DATA)
77                         hysdn_addlog(cnf->card, "conf chan=%d %s", cnf->channel, cp);
78                 return (hysdn_tx_cfgline(cnf->card, cnf->conf_line + 1,
79                                          cnf->channel));        /* send the line without * */
80         }                       /* line to send */
81         return (0);
82 }                               /* process_line */
83
84 /***********************************/
85 /* conf file operations and tables */
86 /***********************************/
87
88 /****************************************************/
89 /* write conf file -> boot or send cfg line to card */
90 /****************************************************/
91 static ssize_t
92 hysdn_conf_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
93 {
94         struct conf_writedata *cnf;
95         int i;
96         unsigned char ch, *cp;
97
98         if (!count)
99                 return (0);     /* nothing to handle */
100
101         if (!(cnf = file->private_data))
102                 return (-EFAULT);       /* should never happen */
103
104         if (cnf->state == CONF_STATE_DETECT) {  /* auto detect cnf or pof data */
105                 if (copy_from_user(&ch, buf, 1))        /* get first char for detect */
106                         return (-EFAULT);
107
108                 if (ch == 0x1A) {
109                         /* we detected a pof file */
110                         if ((cnf->needed_size = pof_write_open(cnf->card, &cnf->pof_buffer)) <= 0)
111                                 return (cnf->needed_size);      /* an error occurred -> exit */
112                         cnf->buf_size = 0;      /* buffer is empty */
113                         cnf->state = CONF_STATE_POF;    /* new state */
114                 } else {
115                         /* conf data has been detected */
116                         cnf->buf_size = 0;      /* buffer is empty */
117                         cnf->state = CONF_STATE_CONF;   /* requested conf data write */
118                         if (cnf->card->state != CARD_STATE_RUN)
119                                 return (-ERR_NOT_BOOTED);
120                         cnf->conf_line[CONF_LINE_LEN - 1] = 0;  /* limit string length */
121                         cnf->channel = 4098;    /* default channel for output */
122                 }
123         }                       /* state was auto detect */
124         if (cnf->state == CONF_STATE_POF) {     /* pof write active */
125                 i = cnf->needed_size - cnf->buf_size;   /* bytes still missing for write */
126                 if (i <= 0)
127                         return (-EINVAL);       /* size error handling pof */
128
129                 if (i < count)
130                         count = i;      /* limit requested number of bytes */
131                 if (copy_from_user(cnf->pof_buffer + cnf->buf_size, buf, count))
132                         return (-EFAULT);       /* error while copying */
133                 cnf->buf_size += count;
134
135                 if (cnf->needed_size == cnf->buf_size) {
136                         cnf->needed_size = pof_write_buffer(cnf->card, cnf->buf_size);  /* write data */
137                         if (cnf->needed_size <= 0) {
138                                 cnf->card->state = CARD_STATE_BOOTERR;  /* show boot error */
139                                 return (cnf->needed_size);      /* an error occurred */
140                         }
141                         cnf->buf_size = 0;      /* buffer is empty again */
142                 }
143         }
144         /* pof write active */
145         else {                  /* conf write active */
146
147                 if (cnf->card->state != CARD_STATE_RUN) {
148                         if (cnf->card->debug_flags & LOG_CNF_MISC)
149                                 hysdn_addlog(cnf->card, "cnf write denied -> not booted");
150                         return (-ERR_NOT_BOOTED);
151                 }
152                 i = (CONF_LINE_LEN - 1) - cnf->buf_size;        /* bytes available in buffer */
153                 if (i > 0) {
154                         /* copy remaining bytes into buffer */
155
156                         if (count > i)
157                                 count = i;      /* limit transfer */
158                         if (copy_from_user(cnf->conf_line + cnf->buf_size, buf, count))
159                                 return (-EFAULT);       /* error while copying */
160
161                         i = count;      /* number of chars in buffer */
162                         cp = cnf->conf_line + cnf->buf_size;
163                         while (i) {
164                                 /* search for end of line */
165                                 if ((*cp < ' ') && (*cp != 9))
166                                         break;  /* end of line found */
167                                 cp++;
168                                 i--;
169                         }       /* search for end of line */
170
171                         if (i) {
172                                 /* delimiter found */
173                                 *cp++ = 0;      /* string termination */
174                                 count -= (i - 1);       /* subtract remaining bytes from count */
175                                 while ((i) && (*cp < ' ') && (*cp != 9)) {
176                                         i--;    /* discard next char */
177                                         count++;        /* mark as read */
178                                         cp++;   /* next char */
179                                 }
180                                 cnf->buf_size = 0;      /* buffer is empty after transfer */
181                                 if ((i = process_line(cnf)) < 0)        /* handle the line */
182                                         count = i;      /* return the error */
183                         }
184                         /* delimiter found */
185                         else {
186                                 cnf->buf_size += count;         /* add chars to string */
187                                 if (cnf->buf_size >= CONF_LINE_LEN - 1) {
188                                         if (cnf->card->debug_flags & LOG_CNF_MISC)
189                                                 hysdn_addlog(cnf->card, "cnf line too long %d chars pos %d", cnf->buf_size, count);
190                                         return (-ERR_CONF_LONG);
191                                 }
192                         }       /* not delimited */
193
194                 }
195                 /* copy remaining bytes into buffer */
196                 else {
197                         if (cnf->card->debug_flags & LOG_CNF_MISC)
198                                 hysdn_addlog(cnf->card, "cnf line too long");
199                         return (-ERR_CONF_LONG);
200                 }
201         }                       /* conf write active */
202
203         return (count);
204 }                               /* hysdn_conf_write */
205
206 /*******************************************/
207 /* read conf file -> output card info data */
208 /*******************************************/
209 static ssize_t
210 hysdn_conf_read(struct file *file, char __user *buf, size_t count, loff_t * off)
211 {
212         char *cp;
213         int i;
214
215         if (file->f_mode & FMODE_READ) {
216                 if (!(cp = file->private_data))
217                         return (-EFAULT);       /* should never happen */
218                 i = strlen(cp); /* get total string length */
219                 if (*off < i) {
220                         /* still bytes to transfer */
221                         cp += *off;     /* point to desired data offset */
222                         i -= *off;      /* remaining length */
223                         if (i > count)
224                                 i = count;      /* limit length to transfer */
225                         if (copy_to_user(buf, cp, i))
226                                 return (-EFAULT);       /* copy error */
227                         *off += i;      /* adjust offset */
228                 } else
229                         return (0);
230         } else
231                 return (-EPERM);        /* no permission to read */
232
233         return (i);
234 }                               /* hysdn_conf_read */
235
236 /******************/
237 /* open conf file */
238 /******************/
239 static int
240 hysdn_conf_open(struct inode *ino, struct file *filep)
241 {
242         hysdn_card *card;
243         struct proc_dir_entry *pd;
244         struct conf_writedata *cnf;
245         char *cp, *tmp;
246
247         /* now search the addressed card */
248         lock_kernel();
249         card = card_root;
250         while (card) {
251                 pd = card->procconf;
252                 if (pd == PDE(ino))
253                         break;
254                 card = card->next;      /* search next entry */
255         }
256         if (!card) {
257                 unlock_kernel();
258                 return (-ENODEV);       /* device is unknown/invalid */
259         }
260         if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
261                 hysdn_addlog(card, "config open for uid=%d gid=%d mode=0x%x",
262                              filep->f_uid, filep->f_gid, filep->f_mode);
263
264         if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
265                 /* write only access -> write boot file or conf line */
266
267                 if (!(cnf = kmalloc(sizeof(struct conf_writedata), GFP_KERNEL))) {
268                         unlock_kernel();
269                         return (-EFAULT);
270                 }
271                 cnf->card = card;
272                 cnf->buf_size = 0;      /* nothing buffered */
273                 cnf->state = CONF_STATE_DETECT;         /* start auto detect */
274                 filep->private_data = cnf;
275
276         } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
277                 /* read access -> output card info data */
278
279                 if (!(tmp = kmalloc(INFO_OUT_LEN * 2 + 2, GFP_KERNEL))) {
280                         unlock_kernel();
281                         return (-EFAULT);       /* out of memory */
282                 }
283                 filep->private_data = tmp;      /* start of string */
284
285                 /* first output a headline */
286                 sprintf(tmp, "id bus slot type irq iobase dp-mem     b-chans fax-chans state device");
287                 cp = tmp;       /* start of string */
288                 while (*cp)
289                         cp++;
290                 while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN)
291                         *cp++ = ' ';
292                 *cp++ = '\n';
293
294                 /* and now the data */
295                 sprintf(cp, "%d  %3d %4d %4d %3d 0x%04x 0x%08lx %7d %9d %3d   %s",
296                         card->myid,
297                         card->bus,
298                         PCI_SLOT(card->devfn),
299                         card->brdtype,
300                         card->irq,
301                         card->iobase,
302                         card->membase,
303                         card->bchans,
304                         card->faxchans,
305                         card->state,
306                         hysdn_net_getname(card));
307                 while (*cp)
308                         cp++;
309                 while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN)
310                         *cp++ = ' ';
311                 *cp++ = '\n';
312                 *cp = 0;        /* end of string */
313         } else {                /* simultaneous read/write access forbidden ! */
314                 unlock_kernel();
315                 return (-EPERM);        /* no permission this time */
316         }
317         unlock_kernel();
318         return nonseekable_open(ino, filep);
319 }                               /* hysdn_conf_open */
320
321 /***************************/
322 /* close a config file.    */
323 /***************************/
324 static int
325 hysdn_conf_close(struct inode *ino, struct file *filep)
326 {
327         hysdn_card *card;
328         struct conf_writedata *cnf;
329         int retval = 0;
330         struct proc_dir_entry *pd;
331
332         lock_kernel();
333         /* search the addressed card */
334         card = card_root;
335         while (card) {
336                 pd = card->procconf;
337                 if (pd == PDE(ino))
338                         break;
339                 card = card->next;      /* search next entry */
340         }
341         if (!card) {
342                 unlock_kernel();
343                 return (-ENODEV);       /* device is unknown/invalid */
344         }
345         if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
346                 hysdn_addlog(card, "config close for uid=%d gid=%d mode=0x%x",
347                              filep->f_uid, filep->f_gid, filep->f_mode);
348
349         if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
350                 /* write only access -> write boot file or conf line */
351                 if (filep->private_data) {
352                         cnf = filep->private_data;
353
354                         if (cnf->state == CONF_STATE_POF)
355                                 retval = pof_write_close(cnf->card);    /* close the pof write */
356                         kfree(filep->private_data);     /* free allocated memory for buffer */
357
358                 }               /* handle write private data */
359         } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
360                 /* read access -> output card info data */
361
362                 kfree(filep->private_data);     /* release memory */
363         }
364         unlock_kernel();
365         return (retval);
366 }                               /* hysdn_conf_close */
367
368 /******************************************************/
369 /* table for conf filesystem functions defined above. */
370 /******************************************************/
371 static const struct file_operations conf_fops =
372 {
373         .llseek         = no_llseek,
374         .read           = hysdn_conf_read,
375         .write          = hysdn_conf_write,
376         .open           = hysdn_conf_open,
377         .release        = hysdn_conf_close,                                       
378 };
379
380 /*****************************/
381 /* hysdn subdir in /proc/net */
382 /*****************************/
383 struct proc_dir_entry *hysdn_proc_entry = NULL;
384
385 /*******************************************************************************/
386 /* hysdn_procconf_init is called when the module is loaded and after the cards */
387 /* have been detected. The needed proc dir and card config files are created.  */
388 /* The log init is called at last.                                             */
389 /*******************************************************************************/
390 int
391 hysdn_procconf_init(void)
392 {
393         hysdn_card *card;
394         unsigned char conf_name[20];
395
396         hysdn_proc_entry = proc_mkdir(PROC_SUBDIR_NAME, init_net.proc_net);
397         if (!hysdn_proc_entry) {
398                 printk(KERN_ERR "HYSDN: unable to create hysdn subdir\n");
399                 return (-1);
400         }
401         card = card_root;       /* point to first card */
402         while (card) {
403
404                 sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid);
405                 if ((card->procconf = (void *) create_proc_entry(conf_name,
406                                              S_IFREG | S_IRUGO | S_IWUSR,
407                                             hysdn_proc_entry)) != NULL) {
408                         ((struct proc_dir_entry *) card->procconf)->proc_fops = &conf_fops;
409                         ((struct proc_dir_entry *) card->procconf)->owner = THIS_MODULE;
410                         hysdn_proclog_init(card);       /* init the log file entry */
411                 }
412                 card = card->next;      /* next entry */
413         }
414
415         printk(KERN_NOTICE "HYSDN: procfs Rev. %s initialised\n", hysdn_getrev(hysdn_procconf_revision));
416         return (0);
417 }                               /* hysdn_procconf_init */
418
419 /*************************************************************************************/
420 /* hysdn_procconf_release is called when the module is unloaded and before the cards */
421 /* resources are released. The module counter is assumed to be 0 !                   */
422 /*************************************************************************************/
423 void
424 hysdn_procconf_release(void)
425 {
426         hysdn_card *card;
427         unsigned char conf_name[20];
428
429         card = card_root;       /* start with first card */
430         while (card) {
431
432                 sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid);
433                 if (card->procconf)
434                         remove_proc_entry(conf_name, hysdn_proc_entry);
435
436                 hysdn_proclog_release(card);    /* init the log file entry */
437
438                 card = card->next;      /* point to next card */
439         }
440
441         remove_proc_entry(PROC_SUBDIR_NAME, init_net.proc_net);
442 }