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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Steven Whitehouse1f12bcc2005-12-05 13:42:06 -080013 * Steve Whitehouse - Memory buffer settings, like the tcp ones
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 *
15 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/mm.h>
17#include <linux/sysctl.h>
18#include <linux/fs.h>
19#include <linux/netdevice.h>
20#include <linux/string.h>
21#include <net/neighbour.h>
22#include <net/dst.h>
23#include <net/flow.h>
24
25#include <asm/uaccess.h>
26
27#include <net/dn.h>
28#include <net/dn_dev.h>
29#include <net/dn_route.h>
30
31
32int decnet_debug_level;
33int decnet_time_wait = 30;
34int decnet_dn_count = 1;
35int decnet_di_count = 3;
36int decnet_dr_count = 3;
37int decnet_log_martians = 1;
38int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;
39
Steven Whitehouse1f12bcc2005-12-05 13:42:06 -080040/* Reasonable defaults, I hope, based on tcp's defaults */
Eric Dumazet8d987e52010-11-09 23:24:26 +000041long sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
Steven Whitehouse1f12bcc2005-12-05 13:42:06 -080042int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
43int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#ifdef CONFIG_SYSCTL
46extern int decnet_dst_gc_interval;
47static int min_decnet_time_wait[] = { 5 };
48static int max_decnet_time_wait[] = { 600 };
49static int min_state_count[] = { 1 };
50static int max_state_count[] = { NSP_MAXRXTSHIFT };
51static int min_decnet_dst_gc_interval[] = { 1 };
52static int max_decnet_dst_gc_interval[] = { 60 };
53static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
54static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
55static char node_name[7] = "???";
56
57static struct ctl_table_header *dn_table_header = NULL;
58
59/*
60 * ctype.h :-)
61 */
62#define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
63#define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
64#define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
65#define ISALPHA(x) (ISLOWER(x) || ISUPPER(x))
66#define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x))
67
68static void strip_it(char *str)
69{
70 for(;;) {
Joe Perches06f8fe12011-07-01 09:43:03 +000071 switch (*str) {
72 case ' ':
73 case '\n':
74 case '\r':
75 case ':':
76 *str = 0;
77 /* Fallthrough */
78 case 0:
79 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 }
81 str++;
82 }
83}
84
85/*
86 * Simple routine to parse an ascii DECnet address
87 * into a network order address.
88 */
Steven Whitehousec4ea94a2006-03-20 22:42:39 -080089static int parse_addr(__le16 *addr, char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
Steven Whitehousec4ea94a2006-03-20 22:42:39 -080091 __u16 area, node;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
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
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800130 *addr = cpu_to_le16((area << 10) | node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
132 return 0;
133}
134
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900135static int dn_node_address_handler(ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 void __user *buffer,
137 size_t *lenp, loff_t *ppos)
138{
139 char addr[DN_ASCBUF_LEN];
140 size_t len;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800141 __le16 dnaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143 if (!*lenp || (*ppos && !write)) {
144 *lenp = 0;
145 return 0;
146 }
147
148 if (write) {
Hannes Edere57c6242009-02-25 10:32:39 +0000149 len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 if (copy_from_user(addr, buffer, len))
152 return -EFAULT;
153
154 addr[len] = 0;
155 strip_it(addr);
156
157 if (parse_addr(&dnaddr, addr))
158 return -EINVAL;
159
160 dn_dev_devices_off();
161
162 decnet_address = dnaddr;
163
164 dn_dev_devices_on();
165
166 *ppos += len;
167
168 return 0;
169 }
170
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800171 dn_addr2asc(le16_to_cpu(decnet_address), addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 len = strlen(addr);
173 addr[len++] = '\n';
174
175 if (len > *lenp) len = *lenp;
176
177 if (copy_to_user(buffer, addr, len))
178 return -EFAULT;
179
180 *lenp = len;
181 *ppos += len;
182
183 return 0;
184}
185
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900186static int dn_def_dev_handler(ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 void __user *buffer,
188 size_t *lenp, loff_t *ppos)
189{
190 size_t len;
191 struct net_device *dev;
192 char devname[17];
193
194 if (!*lenp || (*ppos && !write)) {
195 *lenp = 0;
196 return 0;
197 }
198
199 if (write) {
200 if (*lenp > 16)
201 return -E2BIG;
202
203 if (copy_from_user(devname, buffer, *lenp))
204 return -EFAULT;
205
206 devname[*lenp] = 0;
207 strip_it(devname);
208
Eric W. Biederman881d9662007-09-17 11:56:21 -0700209 dev = dev_get_by_name(&init_net, devname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 if (dev == NULL)
211 return -ENODEV;
212
213 if (dev->dn_ptr == NULL) {
214 dev_put(dev);
215 return -ENODEV;
216 }
217
218 if (dn_dev_set_default(dev, 1)) {
219 dev_put(dev);
220 return -ENODEV;
221 }
222 *ppos += *lenp;
223
224 return 0;
225 }
226
227 dev = dn_dev_get_default();
228 if (dev == NULL) {
229 *lenp = 0;
230 return 0;
231 }
232
233 strcpy(devname, dev->name);
234 dev_put(dev);
235 len = strlen(devname);
236 devname[len++] = '\n';
237
238 if (len > *lenp) len = *lenp;
239
240 if (copy_to_user(buffer, devname, len))
241 return -EFAULT;
242
243 *lenp = len;
244 *ppos += len;
245
246 return 0;
247}
248
249static ctl_table dn_table[] = {
250 {
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900251 .procname = "node_address",
252 .maxlen = 7,
253 .mode = 0644,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 .proc_handler = dn_node_address_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 },
256 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 .procname = "node_name",
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900258 .data = node_name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 .maxlen = 7,
260 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800261 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 },
263 {
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900264 .procname = "default_device",
265 .maxlen = 16,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 .mode = 0644,
267 .proc_handler = dn_def_dev_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 },
269 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 .procname = "time_wait",
271 .data = &decnet_time_wait,
272 .maxlen = sizeof(int),
273 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800274 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 .extra1 = &min_decnet_time_wait,
276 .extra2 = &max_decnet_time_wait
277 },
278 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 .procname = "dn_count",
280 .data = &decnet_dn_count,
281 .maxlen = sizeof(int),
282 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800283 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 .extra1 = &min_state_count,
285 .extra2 = &max_state_count
286 },
287 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 .procname = "di_count",
289 .data = &decnet_di_count,
290 .maxlen = sizeof(int),
291 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800292 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 .extra1 = &min_state_count,
294 .extra2 = &max_state_count
295 },
296 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 .procname = "dr_count",
298 .data = &decnet_dr_count,
299 .maxlen = sizeof(int),
300 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800301 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 .extra1 = &min_state_count,
303 .extra2 = &max_state_count
304 },
305 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 .procname = "dst_gc_interval",
307 .data = &decnet_dst_gc_interval,
308 .maxlen = sizeof(int),
309 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800310 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 .extra1 = &min_decnet_dst_gc_interval,
312 .extra2 = &max_decnet_dst_gc_interval
313 },
314 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 .procname = "no_fc_max_cwnd",
316 .data = &decnet_no_fc_max_cwnd,
317 .maxlen = sizeof(int),
318 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800319 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 .extra1 = &min_decnet_no_fc_max_cwnd,
321 .extra2 = &max_decnet_no_fc_max_cwnd
322 },
Steven Whitehouse1f12bcc2005-12-05 13:42:06 -0800323 {
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900324 .procname = "decnet_mem",
325 .data = &sysctl_decnet_mem,
326 .maxlen = sizeof(sysctl_decnet_mem),
327 .mode = 0644,
Eric Dumazet8d987e52010-11-09 23:24:26 +0000328 .proc_handler = proc_doulongvec_minmax
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900329 },
330 {
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900331 .procname = "decnet_rmem",
332 .data = &sysctl_decnet_rmem,
333 .maxlen = sizeof(sysctl_decnet_rmem),
334 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800335 .proc_handler = proc_dointvec,
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900336 },
337 {
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900338 .procname = "decnet_wmem",
339 .data = &sysctl_decnet_wmem,
340 .maxlen = sizeof(sysctl_decnet_wmem),
341 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800342 .proc_handler = proc_dointvec,
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900343 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 .procname = "debug",
346 .data = &decnet_debug_level,
347 .maxlen = sizeof(int),
348 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800349 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 },
Eric W. Biedermanf8572d82009-11-05 13:32:03 -0800351 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352};
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354void dn_register_sysctl(void)
355{
Eric W. Biederman9bdcc882012-04-19 13:40:37 +0000356 dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358
359void dn_unregister_sysctl(void)
360{
Eric W. Biederman5dd3df12012-04-19 13:24:33 +0000361 unregister_net_sysctl_table(dn_table_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362}
363
364#else /* CONFIG_SYSCTL */
365void dn_unregister_sysctl(void)
366{
367}
368void dn_register_sysctl(void)
369{
370}
371
372#endif