Merge branch 'linus'
[linux-2.6] / net / decnet / sysctl_net_decnet.c
1 /*
2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
3  *              operating system.  DECnet is implemented using the  BSD Socket
4  *              interface as the means of communication with the user level.
5  *
6  *              DECnet sysctl support functions
7  *
8  * Author:      Steve Whitehouse <SteveW@ACM.org>
9  *
10  *
11  * Changes:
12  * Steve Whitehouse - C99 changes and default device handling
13  * Steve Whitehouse - Memory buffer settings, like the tcp ones
14  *
15  */
16 #include <linux/config.h>
17 #include <linux/mm.h>
18 #include <linux/sysctl.h>
19 #include <linux/fs.h>
20 #include <linux/netdevice.h>
21 #include <linux/string.h>
22 #include <net/neighbour.h>
23 #include <net/dst.h>
24 #include <net/flow.h>
25
26 #include <asm/uaccess.h>
27
28 #include <net/dn.h>
29 #include <net/dn_dev.h>
30 #include <net/dn_route.h>
31
32
33 int decnet_debug_level;
34 int decnet_time_wait = 30;
35 int decnet_dn_count = 1;
36 int decnet_di_count = 3;
37 int decnet_dr_count = 3;
38 int decnet_log_martians = 1;
39 int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;
40
41 /* Reasonable defaults, I hope, based on tcp's defaults */
42 int sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
43 int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
44 int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };
45
46 #ifdef CONFIG_SYSCTL
47 extern int decnet_dst_gc_interval;
48 static int min_decnet_time_wait[] = { 5 };
49 static int max_decnet_time_wait[] = { 600 };
50 static int min_state_count[] = { 1 };
51 static int max_state_count[] = { NSP_MAXRXTSHIFT };
52 static int min_decnet_dst_gc_interval[] = { 1 };
53 static int max_decnet_dst_gc_interval[] = { 60 };
54 static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
55 static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
56 static char node_name[7] = "???";
57
58 static struct ctl_table_header *dn_table_header = NULL;
59
60 /*
61  * ctype.h :-)
62  */
63 #define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
64 #define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
65 #define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
66 #define ISALPHA(x) (ISLOWER(x) || ISUPPER(x))
67 #define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x))
68
69 static void strip_it(char *str)
70 {
71         for(;;) {
72                 switch(*str) {
73                         case ' ':
74                         case '\n':
75                         case '\r':
76                         case ':':
77                                 *str = 0;
78                         case 0:
79                                 return;
80                 }
81                 str++;
82         }
83 }
84
85 /*
86  * Simple routine to parse an ascii DECnet address
87  * into a network order address.
88  */
89 static int parse_addr(__le16 *addr, char *str)
90 {
91         __u16 area, node;
92
93         while(*str && !ISNUM(*str)) str++;
94
95         if (*str == 0)
96                 return -1;
97
98         area = (*str++ - '0');
99         if (ISNUM(*str)) {
100                 area *= 10;
101                 area += (*str++ - '0');
102         }
103
104         if (*str++ != '.')
105                 return -1;
106
107         if (!ISNUM(*str))
108                 return -1;
109
110         node = *str++ - '0';
111         if (ISNUM(*str)) {
112                 node *= 10;
113                 node += (*str++ - '0');
114         }
115         if (ISNUM(*str)) {
116                 node *= 10;
117                 node += (*str++ - '0');
118         }
119         if (ISNUM(*str)) {
120                 node *= 10;
121                 node += (*str++ - '0');
122         }
123
124         if ((node > 1023) || (area > 63))
125                 return -1;
126
127         if (INVALID_END_CHAR(*str))
128                 return -1;
129
130         *addr = dn_htons((area << 10) | node);
131
132         return 0;
133 }
134
135
136 static int dn_node_address_strategy(ctl_table *table, int __user *name, int nlen,
137                                 void __user *oldval, size_t __user *oldlenp,
138                                 void __user *newval, size_t newlen,
139                                 void **context)
140 {
141         size_t len;
142         __le16 addr;
143
144         if (oldval && oldlenp) {
145                 if (get_user(len, oldlenp))
146                         return -EFAULT;
147                 if (len) {
148                         if (len != sizeof(unsigned short))
149                                 return -EINVAL;
150                         if (put_user(decnet_address, (__le16 __user *)oldval))
151                                 return -EFAULT;
152                 }
153         }
154         if (newval && newlen) {
155                 if (newlen != sizeof(unsigned short))
156                         return -EINVAL;
157                 if (get_user(addr, (__le16 __user *)newval))
158                         return -EFAULT;
159
160                 dn_dev_devices_off();
161
162                 decnet_address = addr;
163
164                 dn_dev_devices_on();
165         }
166         return 0;
167 }
168
169 static int dn_node_address_handler(ctl_table *table, int write, 
170                                 struct file *filp,
171                                 void __user *buffer,
172                                 size_t *lenp, loff_t *ppos)
173 {
174         char addr[DN_ASCBUF_LEN];
175         size_t len;
176         __le16 dnaddr;
177
178         if (!*lenp || (*ppos && !write)) {
179                 *lenp = 0;
180                 return 0;
181         }
182
183         if (write) {
184                 int len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
185
186                 if (copy_from_user(addr, buffer, len))
187                         return -EFAULT;
188
189                 addr[len] = 0;
190                 strip_it(addr);
191
192                 if (parse_addr(&dnaddr, addr))
193                         return -EINVAL;
194
195                 dn_dev_devices_off();
196
197                 decnet_address = dnaddr;
198
199                 dn_dev_devices_on();
200
201                 *ppos += len;
202
203                 return 0;
204         }
205
206         dn_addr2asc(dn_ntohs(decnet_address), addr);
207         len = strlen(addr);
208         addr[len++] = '\n';
209
210         if (len > *lenp) len = *lenp;
211
212         if (copy_to_user(buffer, addr, len))
213                 return -EFAULT;
214
215         *lenp = len;
216         *ppos += len;
217
218         return 0;
219 }
220
221
222 static int dn_def_dev_strategy(ctl_table *table, int __user *name, int nlen,
223                                 void __user *oldval, size_t __user *oldlenp,
224                                 void __user *newval, size_t newlen,
225                                 void **context)
226 {
227         size_t len;
228         struct net_device *dev;
229         char devname[17];
230         size_t namel;
231         int rv = 0;
232
233         devname[0] = 0;
234
235         if (oldval && oldlenp) {
236                 if (get_user(len, oldlenp))
237                         return -EFAULT;
238                 if (len) {
239                         dev = dn_dev_get_default();
240                         if (dev) {
241                                 strcpy(devname, dev->name);
242                                 dev_put(dev);
243                         }
244
245                         namel = strlen(devname) + 1;
246                         if (len > namel) len = namel;   
247
248                         if (copy_to_user(oldval, devname, len))
249                                 return -EFAULT;
250
251                         if (put_user(len, oldlenp))
252                                 return -EFAULT;
253                 }
254         }
255
256         if (newval && newlen) {
257                 if (newlen > 16)
258                         return -E2BIG;
259
260                 if (copy_from_user(devname, newval, newlen))
261                         return -EFAULT;
262
263                 devname[newlen] = 0;
264
265                 dev = dev_get_by_name(devname);
266                 if (dev == NULL)
267                         return -ENODEV;
268
269                 rv = -ENODEV;
270                 if (dev->dn_ptr != NULL) {
271                         rv = dn_dev_set_default(dev, 1);
272                         if (rv)
273                                 dev_put(dev);
274                 }
275         }
276
277         return rv;
278 }
279
280
281 static int dn_def_dev_handler(ctl_table *table, int write, 
282                                 struct file * filp,
283                                 void __user *buffer,
284                                 size_t *lenp, loff_t *ppos)
285 {
286         size_t len;
287         struct net_device *dev;
288         char devname[17];
289
290         if (!*lenp || (*ppos && !write)) {
291                 *lenp = 0;
292                 return 0;
293         }
294
295         if (write) {
296                 if (*lenp > 16)
297                         return -E2BIG;
298
299                 if (copy_from_user(devname, buffer, *lenp))
300                         return -EFAULT;
301
302                 devname[*lenp] = 0;
303                 strip_it(devname);
304
305                 dev = dev_get_by_name(devname);
306                 if (dev == NULL)
307                         return -ENODEV;
308
309                 if (dev->dn_ptr == NULL) {
310                         dev_put(dev);
311                         return -ENODEV;
312                 }
313
314                 if (dn_dev_set_default(dev, 1)) {
315                         dev_put(dev);
316                         return -ENODEV;
317                 }
318                 *ppos += *lenp;
319
320                 return 0;
321         }
322
323         dev = dn_dev_get_default();
324         if (dev == NULL) {
325                 *lenp = 0;
326                 return 0;
327         }
328
329         strcpy(devname, dev->name);
330         dev_put(dev);
331         len = strlen(devname);
332         devname[len++] = '\n';
333
334         if (len > *lenp) len = *lenp;
335
336         if (copy_to_user(buffer, devname, len))
337                 return -EFAULT;
338
339         *lenp = len;
340         *ppos += len;
341
342         return 0;
343 }
344
345 static ctl_table dn_table[] = {
346         {
347                 .ctl_name = NET_DECNET_NODE_ADDRESS, 
348                 .procname = "node_address", 
349                 .maxlen = 7, 
350                 .mode = 0644, 
351                 .proc_handler = dn_node_address_handler,
352                 .strategy = dn_node_address_strategy,
353         },
354         {
355                 .ctl_name = NET_DECNET_NODE_NAME,
356                 .procname = "node_name",
357                 .data = node_name, 
358                 .maxlen = 7,
359                 .mode = 0644,
360                 .proc_handler = &proc_dostring,
361                 .strategy = &sysctl_string,
362         },
363         {
364                 .ctl_name = NET_DECNET_DEFAULT_DEVICE,
365                 .procname = "default_device", 
366                 .maxlen = 16, 
367                 .mode = 0644,
368                 .proc_handler = dn_def_dev_handler,
369                 .strategy = dn_def_dev_strategy,
370         },
371         {
372                 .ctl_name = NET_DECNET_TIME_WAIT,
373                 .procname = "time_wait",
374                 .data = &decnet_time_wait,
375                 .maxlen = sizeof(int),
376                 .mode = 0644,
377                 .proc_handler = &proc_dointvec_minmax,
378                 .strategy = &sysctl_intvec,
379                 .extra1 = &min_decnet_time_wait,
380                 .extra2 = &max_decnet_time_wait
381         },
382         {
383                 .ctl_name = NET_DECNET_DN_COUNT,
384                 .procname = "dn_count",
385                 .data = &decnet_dn_count,
386                 .maxlen = sizeof(int),
387                 .mode = 0644,
388                 .proc_handler = &proc_dointvec_minmax,
389                 .strategy = &sysctl_intvec,
390                 .extra1 = &min_state_count,
391                 .extra2 = &max_state_count
392         },
393         {
394                 .ctl_name = NET_DECNET_DI_COUNT,
395                 .procname = "di_count",
396                 .data = &decnet_di_count,
397                 .maxlen = sizeof(int),
398                 .mode = 0644,
399                 .proc_handler = &proc_dointvec_minmax,
400                 .strategy = &sysctl_intvec,
401                 .extra1 = &min_state_count,
402                 .extra2 = &max_state_count
403         },
404         {
405                 .ctl_name = NET_DECNET_DR_COUNT,
406                 .procname = "dr_count",
407                 .data = &decnet_dr_count,
408                 .maxlen = sizeof(int),
409                 .mode = 0644,
410                 .proc_handler = &proc_dointvec_minmax,
411                 .strategy = &sysctl_intvec,
412                 .extra1 = &min_state_count,
413                 .extra2 = &max_state_count
414         },
415         {
416                 .ctl_name = NET_DECNET_DST_GC_INTERVAL,
417                 .procname = "dst_gc_interval",
418                 .data = &decnet_dst_gc_interval,
419                 .maxlen = sizeof(int),
420                 .mode = 0644,
421                 .proc_handler = &proc_dointvec_minmax,
422                 .strategy = &sysctl_intvec,
423                 .extra1 = &min_decnet_dst_gc_interval,
424                 .extra2 = &max_decnet_dst_gc_interval
425         },
426         {
427                 .ctl_name = NET_DECNET_NO_FC_MAX_CWND,
428                 .procname = "no_fc_max_cwnd",
429                 .data = &decnet_no_fc_max_cwnd,
430                 .maxlen = sizeof(int),
431                 .mode = 0644,
432                 .proc_handler = &proc_dointvec_minmax,
433                 .strategy = &sysctl_intvec,
434                 .extra1 = &min_decnet_no_fc_max_cwnd,
435                 .extra2 = &max_decnet_no_fc_max_cwnd
436         },
437        {
438                 .ctl_name = NET_DECNET_MEM,
439                 .procname = "decnet_mem",
440                 .data = &sysctl_decnet_mem,
441                 .maxlen = sizeof(sysctl_decnet_mem),
442                 .mode = 0644,
443                 .proc_handler = &proc_dointvec,
444                 .strategy = &sysctl_intvec,
445         },
446         {
447                 .ctl_name = NET_DECNET_RMEM,
448                 .procname = "decnet_rmem",
449                 .data = &sysctl_decnet_rmem,
450                 .maxlen = sizeof(sysctl_decnet_rmem),
451                 .mode = 0644,
452                 .proc_handler = &proc_dointvec,
453                 .strategy = &sysctl_intvec,
454         },
455         {
456                 .ctl_name = NET_DECNET_WMEM,
457                 .procname = "decnet_wmem",
458                 .data = &sysctl_decnet_wmem,
459                 .maxlen = sizeof(sysctl_decnet_wmem),
460                 .mode = 0644,
461                 .proc_handler = &proc_dointvec,
462                 .strategy = &sysctl_intvec,
463         },
464         {
465                 .ctl_name = NET_DECNET_DEBUG_LEVEL,
466                 .procname = "debug",
467                 .data = &decnet_debug_level,
468                 .maxlen = sizeof(int),
469                 .mode = 0644,
470                 .proc_handler = &proc_dointvec,
471                 .strategy = &sysctl_intvec,
472         },
473         {0}
474 };
475
476 static ctl_table dn_dir_table[] = {
477         {
478                 .ctl_name = NET_DECNET, 
479                 .procname = "decnet", 
480                 .mode = 0555, 
481                 .child = dn_table},
482         {0}
483 };
484
485 static ctl_table dn_root_table[] = {
486         {
487                 .ctl_name = CTL_NET, 
488                 .procname = "net", 
489                 .mode = 0555, 
490                 .child = dn_dir_table
491         },
492         {0}
493 };
494
495 void dn_register_sysctl(void)
496 {
497         dn_table_header = register_sysctl_table(dn_root_table, 1);
498 }
499
500 void dn_unregister_sysctl(void)
501 {
502         unregister_sysctl_table(dn_table_header);
503 }
504
505 #else  /* CONFIG_SYSCTL */
506 void dn_unregister_sysctl(void)
507 {
508 }
509 void dn_register_sysctl(void)
510 {
511 }
512
513 #endif