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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/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
40/* Reasonable defaults, I hope, based on tcp's defaults */
41long sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
42int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
43int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };
44
45#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(;;) {
71 switch (*str) {
72 case ' ':
73 case '\n':
74 case '\r':
75 case ':':
76 *str = 0;
77 /* Fallthrough */
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 */
89static 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 = cpu_to_le16((area << 10) | node);
131
132 return 0;
133}
134
135static int dn_node_address_handler(struct ctl_table *table, int write,
136 void __user *buffer,
137 size_t *lenp, loff_t *ppos)
138{
139 char addr[DN_ASCBUF_LEN];
140 size_t len;
141 __le16 dnaddr;
142
143 if (!*lenp || (*ppos && !write)) {
144 *lenp = 0;
145 return 0;
146 }
147
148 if (write) {
149 len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
150
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
171 dn_addr2asc(le16_to_cpu(decnet_address), addr);
172 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
186static int dn_def_dev_handler(struct ctl_table *table, int write,
187 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
209 dev = dev_get_by_name(&init_net, devname);
210 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 struct ctl_table dn_table[] = {
250 {
251 .procname = "node_address",
252 .maxlen = 7,
253 .mode = 0644,
254 .proc_handler = dn_node_address_handler,
255 },
256 {
257 .procname = "node_name",
258 .data = node_name,
259 .maxlen = 7,
260 .mode = 0644,
261 .proc_handler = proc_dostring,
262 },
263 {
264 .procname = "default_device",
265 .maxlen = 16,
266 .mode = 0644,
267 .proc_handler = dn_def_dev_handler,
268 },
269 {
270 .procname = "time_wait",
271 .data = &decnet_time_wait,
272 .maxlen = sizeof(int),
273 .mode = 0644,
274 .proc_handler = proc_dointvec_minmax,
275 .extra1 = &min_decnet_time_wait,
276 .extra2 = &max_decnet_time_wait
277 },
278 {
279 .procname = "dn_count",
280 .data = &decnet_dn_count,
281 .maxlen = sizeof(int),
282 .mode = 0644,
283 .proc_handler = proc_dointvec_minmax,
284 .extra1 = &min_state_count,
285 .extra2 = &max_state_count
286 },
287 {
288 .procname = "di_count",
289 .data = &decnet_di_count,
290 .maxlen = sizeof(int),
291 .mode = 0644,
292 .proc_handler = proc_dointvec_minmax,
293 .extra1 = &min_state_count,
294 .extra2 = &max_state_count
295 },
296 {
297 .procname = "dr_count",
298 .data = &decnet_dr_count,
299 .maxlen = sizeof(int),
300 .mode = 0644,
301 .proc_handler = proc_dointvec_minmax,
302 .extra1 = &min_state_count,
303 .extra2 = &max_state_count
304 },
305 {
306 .procname = "dst_gc_interval",
307 .data = &decnet_dst_gc_interval,
308 .maxlen = sizeof(int),
309 .mode = 0644,
310 .proc_handler = proc_dointvec_minmax,
311 .extra1 = &min_decnet_dst_gc_interval,
312 .extra2 = &max_decnet_dst_gc_interval
313 },
314 {
315 .procname = "no_fc_max_cwnd",
316 .data = &decnet_no_fc_max_cwnd,
317 .maxlen = sizeof(int),
318 .mode = 0644,
319 .proc_handler = proc_dointvec_minmax,
320 .extra1 = &min_decnet_no_fc_max_cwnd,
321 .extra2 = &max_decnet_no_fc_max_cwnd
322 },
323 {
324 .procname = "decnet_mem",
325 .data = &sysctl_decnet_mem,
326 .maxlen = sizeof(sysctl_decnet_mem),
327 .mode = 0644,
328 .proc_handler = proc_doulongvec_minmax
329 },
330 {
331 .procname = "decnet_rmem",
332 .data = &sysctl_decnet_rmem,
333 .maxlen = sizeof(sysctl_decnet_rmem),
334 .mode = 0644,
335 .proc_handler = proc_dointvec,
336 },
337 {
338 .procname = "decnet_wmem",
339 .data = &sysctl_decnet_wmem,
340 .maxlen = sizeof(sysctl_decnet_wmem),
341 .mode = 0644,
342 .proc_handler = proc_dointvec,
343 },
344 {
345 .procname = "debug",
346 .data = &decnet_debug_level,
347 .maxlen = sizeof(int),
348 .mode = 0644,
349 .proc_handler = proc_dointvec,
350 },
351 { }
352};
353
354void dn_register_sysctl(void)
355{
356 dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table);
357}
358
359void dn_unregister_sysctl(void)
360{
361 unregister_net_sysctl_table(dn_table_header);
362}
363
364#else /* CONFIG_SYSCTL */
365void dn_unregister_sysctl(void)
366{
367}
368void dn_register_sysctl(void)
369{
370}
371
372#endif
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * DECnet sysctl support functions
8 *
9 * Author: Steve Whitehouse <SteveW@ACM.org>
10 *
11 *
12 * Changes:
13 * Steve Whitehouse - C99 changes and default device handling
14 * Steve Whitehouse - Memory buffer settings, like the tcp ones
15 *
16 */
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 <linux/uaccess.h>
27
28#include <net/dn.h>
29#include <net/dn_dev.h>
30#include <net/dn_route.h>
31
32
33int decnet_debug_level;
34int decnet_time_wait = 30;
35int decnet_dn_count = 1;
36int decnet_di_count = 3;
37int decnet_dr_count = 3;
38int decnet_log_martians = 1;
39int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;
40
41/* Reasonable defaults, I hope, based on tcp's defaults */
42long sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
43int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
44int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };
45
46#ifdef CONFIG_SYSCTL
47extern int decnet_dst_gc_interval;
48static int min_decnet_time_wait[] = { 5 };
49static int max_decnet_time_wait[] = { 600 };
50static int min_state_count[] = { 1 };
51static int max_state_count[] = { NSP_MAXRXTSHIFT };
52static int min_decnet_dst_gc_interval[] = { 1 };
53static int max_decnet_dst_gc_interval[] = { 60 };
54static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
55static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
56static char node_name[7] = "???";
57
58static 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
69static 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 fallthrough;
79 case 0:
80 return;
81 }
82 str++;
83 }
84}
85
86/*
87 * Simple routine to parse an ascii DECnet address
88 * into a network order address.
89 */
90static int parse_addr(__le16 *addr, char *str)
91{
92 __u16 area, node;
93
94 while(*str && !ISNUM(*str)) str++;
95
96 if (*str == 0)
97 return -1;
98
99 area = (*str++ - '0');
100 if (ISNUM(*str)) {
101 area *= 10;
102 area += (*str++ - '0');
103 }
104
105 if (*str++ != '.')
106 return -1;
107
108 if (!ISNUM(*str))
109 return -1;
110
111 node = *str++ - '0';
112 if (ISNUM(*str)) {
113 node *= 10;
114 node += (*str++ - '0');
115 }
116 if (ISNUM(*str)) {
117 node *= 10;
118 node += (*str++ - '0');
119 }
120 if (ISNUM(*str)) {
121 node *= 10;
122 node += (*str++ - '0');
123 }
124
125 if ((node > 1023) || (area > 63))
126 return -1;
127
128 if (INVALID_END_CHAR(*str))
129 return -1;
130
131 *addr = cpu_to_le16((area << 10) | node);
132
133 return 0;
134}
135
136static int dn_node_address_handler(struct ctl_table *table, int write,
137 void *buffer, size_t *lenp, loff_t *ppos)
138{
139 char addr[DN_ASCBUF_LEN];
140 size_t len;
141 __le16 dnaddr;
142
143 if (!*lenp || (*ppos && !write)) {
144 *lenp = 0;
145 return 0;
146 }
147
148 if (write) {
149 len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
150 memcpy(addr, buffer, len);
151 addr[len] = 0;
152 strip_it(addr);
153
154 if (parse_addr(&dnaddr, addr))
155 return -EINVAL;
156
157 dn_dev_devices_off();
158
159 decnet_address = dnaddr;
160
161 dn_dev_devices_on();
162
163 *ppos += len;
164
165 return 0;
166 }
167
168 dn_addr2asc(le16_to_cpu(decnet_address), addr);
169 len = strlen(addr);
170 addr[len++] = '\n';
171
172 if (len > *lenp)
173 len = *lenp;
174 memcpy(buffer, addr, len);
175 *lenp = len;
176 *ppos += len;
177
178 return 0;
179}
180
181static int dn_def_dev_handler(struct ctl_table *table, int write,
182 void *buffer, size_t *lenp, loff_t *ppos)
183{
184 size_t len;
185 struct net_device *dev;
186 char devname[17];
187
188 if (!*lenp || (*ppos && !write)) {
189 *lenp = 0;
190 return 0;
191 }
192
193 if (write) {
194 if (*lenp > 16)
195 return -E2BIG;
196
197 memcpy(devname, buffer, *lenp);
198 devname[*lenp] = 0;
199 strip_it(devname);
200
201 dev = dev_get_by_name(&init_net, devname);
202 if (dev == NULL)
203 return -ENODEV;
204
205 if (dev->dn_ptr == NULL) {
206 dev_put(dev);
207 return -ENODEV;
208 }
209
210 if (dn_dev_set_default(dev, 1)) {
211 dev_put(dev);
212 return -ENODEV;
213 }
214 *ppos += *lenp;
215
216 return 0;
217 }
218
219 dev = dn_dev_get_default();
220 if (dev == NULL) {
221 *lenp = 0;
222 return 0;
223 }
224
225 strcpy(devname, dev->name);
226 dev_put(dev);
227 len = strlen(devname);
228 devname[len++] = '\n';
229
230 if (len > *lenp) len = *lenp;
231
232 memcpy(buffer, devname, len);
233 *lenp = len;
234 *ppos += len;
235
236 return 0;
237}
238
239static struct ctl_table dn_table[] = {
240 {
241 .procname = "node_address",
242 .maxlen = 7,
243 .mode = 0644,
244 .proc_handler = dn_node_address_handler,
245 },
246 {
247 .procname = "node_name",
248 .data = node_name,
249 .maxlen = 7,
250 .mode = 0644,
251 .proc_handler = proc_dostring,
252 },
253 {
254 .procname = "default_device",
255 .maxlen = 16,
256 .mode = 0644,
257 .proc_handler = dn_def_dev_handler,
258 },
259 {
260 .procname = "time_wait",
261 .data = &decnet_time_wait,
262 .maxlen = sizeof(int),
263 .mode = 0644,
264 .proc_handler = proc_dointvec_minmax,
265 .extra1 = &min_decnet_time_wait,
266 .extra2 = &max_decnet_time_wait
267 },
268 {
269 .procname = "dn_count",
270 .data = &decnet_dn_count,
271 .maxlen = sizeof(int),
272 .mode = 0644,
273 .proc_handler = proc_dointvec_minmax,
274 .extra1 = &min_state_count,
275 .extra2 = &max_state_count
276 },
277 {
278 .procname = "di_count",
279 .data = &decnet_di_count,
280 .maxlen = sizeof(int),
281 .mode = 0644,
282 .proc_handler = proc_dointvec_minmax,
283 .extra1 = &min_state_count,
284 .extra2 = &max_state_count
285 },
286 {
287 .procname = "dr_count",
288 .data = &decnet_dr_count,
289 .maxlen = sizeof(int),
290 .mode = 0644,
291 .proc_handler = proc_dointvec_minmax,
292 .extra1 = &min_state_count,
293 .extra2 = &max_state_count
294 },
295 {
296 .procname = "dst_gc_interval",
297 .data = &decnet_dst_gc_interval,
298 .maxlen = sizeof(int),
299 .mode = 0644,
300 .proc_handler = proc_dointvec_minmax,
301 .extra1 = &min_decnet_dst_gc_interval,
302 .extra2 = &max_decnet_dst_gc_interval
303 },
304 {
305 .procname = "no_fc_max_cwnd",
306 .data = &decnet_no_fc_max_cwnd,
307 .maxlen = sizeof(int),
308 .mode = 0644,
309 .proc_handler = proc_dointvec_minmax,
310 .extra1 = &min_decnet_no_fc_max_cwnd,
311 .extra2 = &max_decnet_no_fc_max_cwnd
312 },
313 {
314 .procname = "decnet_mem",
315 .data = &sysctl_decnet_mem,
316 .maxlen = sizeof(sysctl_decnet_mem),
317 .mode = 0644,
318 .proc_handler = proc_doulongvec_minmax
319 },
320 {
321 .procname = "decnet_rmem",
322 .data = &sysctl_decnet_rmem,
323 .maxlen = sizeof(sysctl_decnet_rmem),
324 .mode = 0644,
325 .proc_handler = proc_dointvec,
326 },
327 {
328 .procname = "decnet_wmem",
329 .data = &sysctl_decnet_wmem,
330 .maxlen = sizeof(sysctl_decnet_wmem),
331 .mode = 0644,
332 .proc_handler = proc_dointvec,
333 },
334 {
335 .procname = "debug",
336 .data = &decnet_debug_level,
337 .maxlen = sizeof(int),
338 .mode = 0644,
339 .proc_handler = proc_dointvec,
340 },
341 { }
342};
343
344void dn_register_sysctl(void)
345{
346 dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table);
347}
348
349void dn_unregister_sysctl(void)
350{
351 unregister_net_sysctl_table(dn_table_header);
352}
353
354#else /* CONFIG_SYSCTL */
355void dn_unregister_sysctl(void)
356{
357}
358void dn_register_sysctl(void)
359{
360}
361
362#endif