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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
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 | |
1f12bcc9 | 14 | * Steve Whitehouse - Memory buffer settings, like the tcp ones |
1da177e4 LT |
15 | * |
16 | */ | |
1da177e4 LT |
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 | ||
7c0f6ba6 | 26 | #include <linux/uaccess.h> |
1da177e4 LT |
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 | ||
1f12bcc9 | 41 | /* Reasonable defaults, I hope, based on tcp's defaults */ |
8d987e5c | 42 | long sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 }; |
1f12bcc9 SW |
43 | int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 }; |
44 | int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 }; | |
45 | ||
1da177e4 LT |
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(;;) { | |
06f8fe11 JP |
72 | switch (*str) { |
73 | case ' ': | |
74 | case '\n': | |
75 | case '\r': | |
76 | case ':': | |
77 | *str = 0; | |
78 | /* Fallthrough */ | |
79 | case 0: | |
80 | return; | |
1da177e4 LT |
81 | } |
82 | str++; | |
83 | } | |
84 | } | |
85 | ||
86 | /* | |
87 | * Simple routine to parse an ascii DECnet address | |
88 | * into a network order address. | |
89 | */ | |
c4ea94ab | 90 | static int parse_addr(__le16 *addr, char *str) |
1da177e4 | 91 | { |
c4ea94ab | 92 | __u16 area, node; |
1da177e4 LT |
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 | ||
c4106aa8 | 131 | *addr = cpu_to_le16((area << 10) | node); |
1da177e4 LT |
132 | |
133 | return 0; | |
134 | } | |
135 | ||
fe2c6338 | 136 | static int dn_node_address_handler(struct ctl_table *table, int write, |
1da177e4 LT |
137 | void __user *buffer, |
138 | size_t *lenp, loff_t *ppos) | |
139 | { | |
140 | char addr[DN_ASCBUF_LEN]; | |
141 | size_t len; | |
c4ea94ab | 142 | __le16 dnaddr; |
1da177e4 LT |
143 | |
144 | if (!*lenp || (*ppos && !write)) { | |
145 | *lenp = 0; | |
146 | return 0; | |
147 | } | |
148 | ||
149 | if (write) { | |
e57c624b | 150 | len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1); |
1da177e4 LT |
151 | |
152 | if (copy_from_user(addr, buffer, len)) | |
153 | return -EFAULT; | |
154 | ||
155 | addr[len] = 0; | |
156 | strip_it(addr); | |
157 | ||
158 | if (parse_addr(&dnaddr, addr)) | |
159 | return -EINVAL; | |
160 | ||
161 | dn_dev_devices_off(); | |
162 | ||
163 | decnet_address = dnaddr; | |
164 | ||
165 | dn_dev_devices_on(); | |
166 | ||
167 | *ppos += len; | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
c4106aa8 | 172 | dn_addr2asc(le16_to_cpu(decnet_address), addr); |
1da177e4 LT |
173 | len = strlen(addr); |
174 | addr[len++] = '\n'; | |
175 | ||
176 | if (len > *lenp) len = *lenp; | |
177 | ||
178 | if (copy_to_user(buffer, addr, len)) | |
179 | return -EFAULT; | |
180 | ||
181 | *lenp = len; | |
182 | *ppos += len; | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
fe2c6338 | 187 | static int dn_def_dev_handler(struct ctl_table *table, int write, |
1da177e4 LT |
188 | void __user *buffer, |
189 | size_t *lenp, loff_t *ppos) | |
190 | { | |
191 | size_t len; | |
192 | struct net_device *dev; | |
193 | char devname[17]; | |
194 | ||
195 | if (!*lenp || (*ppos && !write)) { | |
196 | *lenp = 0; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | if (write) { | |
201 | if (*lenp > 16) | |
202 | return -E2BIG; | |
203 | ||
204 | if (copy_from_user(devname, buffer, *lenp)) | |
205 | return -EFAULT; | |
206 | ||
207 | devname[*lenp] = 0; | |
208 | strip_it(devname); | |
209 | ||
881d966b | 210 | dev = dev_get_by_name(&init_net, devname); |
1da177e4 LT |
211 | if (dev == NULL) |
212 | return -ENODEV; | |
213 | ||
214 | if (dev->dn_ptr == NULL) { | |
215 | dev_put(dev); | |
216 | return -ENODEV; | |
217 | } | |
218 | ||
219 | if (dn_dev_set_default(dev, 1)) { | |
220 | dev_put(dev); | |
221 | return -ENODEV; | |
222 | } | |
223 | *ppos += *lenp; | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | dev = dn_dev_get_default(); | |
229 | if (dev == NULL) { | |
230 | *lenp = 0; | |
231 | return 0; | |
232 | } | |
233 | ||
234 | strcpy(devname, dev->name); | |
235 | dev_put(dev); | |
236 | len = strlen(devname); | |
237 | devname[len++] = '\n'; | |
238 | ||
239 | if (len > *lenp) len = *lenp; | |
240 | ||
241 | if (copy_to_user(buffer, devname, len)) | |
242 | return -EFAULT; | |
243 | ||
244 | *lenp = len; | |
245 | *ppos += len; | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
fe2c6338 | 250 | static struct ctl_table dn_table[] = { |
1da177e4 | 251 | { |
429eb0fa YH |
252 | .procname = "node_address", |
253 | .maxlen = 7, | |
254 | .mode = 0644, | |
1da177e4 | 255 | .proc_handler = dn_node_address_handler, |
1da177e4 LT |
256 | }, |
257 | { | |
1da177e4 | 258 | .procname = "node_name", |
429eb0fa | 259 | .data = node_name, |
1da177e4 LT |
260 | .maxlen = 7, |
261 | .mode = 0644, | |
6d9f239a | 262 | .proc_handler = proc_dostring, |
1da177e4 LT |
263 | }, |
264 | { | |
429eb0fa YH |
265 | .procname = "default_device", |
266 | .maxlen = 16, | |
1da177e4 LT |
267 | .mode = 0644, |
268 | .proc_handler = dn_def_dev_handler, | |
1da177e4 LT |
269 | }, |
270 | { | |
1da177e4 LT |
271 | .procname = "time_wait", |
272 | .data = &decnet_time_wait, | |
273 | .maxlen = sizeof(int), | |
274 | .mode = 0644, | |
6d9f239a | 275 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
276 | .extra1 = &min_decnet_time_wait, |
277 | .extra2 = &max_decnet_time_wait | |
278 | }, | |
279 | { | |
1da177e4 LT |
280 | .procname = "dn_count", |
281 | .data = &decnet_dn_count, | |
282 | .maxlen = sizeof(int), | |
283 | .mode = 0644, | |
6d9f239a | 284 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
285 | .extra1 = &min_state_count, |
286 | .extra2 = &max_state_count | |
287 | }, | |
288 | { | |
1da177e4 LT |
289 | .procname = "di_count", |
290 | .data = &decnet_di_count, | |
291 | .maxlen = sizeof(int), | |
292 | .mode = 0644, | |
6d9f239a | 293 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
294 | .extra1 = &min_state_count, |
295 | .extra2 = &max_state_count | |
296 | }, | |
297 | { | |
1da177e4 LT |
298 | .procname = "dr_count", |
299 | .data = &decnet_dr_count, | |
300 | .maxlen = sizeof(int), | |
301 | .mode = 0644, | |
6d9f239a | 302 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
303 | .extra1 = &min_state_count, |
304 | .extra2 = &max_state_count | |
305 | }, | |
306 | { | |
1da177e4 LT |
307 | .procname = "dst_gc_interval", |
308 | .data = &decnet_dst_gc_interval, | |
309 | .maxlen = sizeof(int), | |
310 | .mode = 0644, | |
6d9f239a | 311 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
312 | .extra1 = &min_decnet_dst_gc_interval, |
313 | .extra2 = &max_decnet_dst_gc_interval | |
314 | }, | |
315 | { | |
1da177e4 LT |
316 | .procname = "no_fc_max_cwnd", |
317 | .data = &decnet_no_fc_max_cwnd, | |
318 | .maxlen = sizeof(int), | |
319 | .mode = 0644, | |
6d9f239a | 320 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
321 | .extra1 = &min_decnet_no_fc_max_cwnd, |
322 | .extra2 = &max_decnet_no_fc_max_cwnd | |
323 | }, | |
1f12bcc9 | 324 | { |
429eb0fa YH |
325 | .procname = "decnet_mem", |
326 | .data = &sysctl_decnet_mem, | |
327 | .maxlen = sizeof(sysctl_decnet_mem), | |
328 | .mode = 0644, | |
8d987e5c | 329 | .proc_handler = proc_doulongvec_minmax |
429eb0fa YH |
330 | }, |
331 | { | |
429eb0fa YH |
332 | .procname = "decnet_rmem", |
333 | .data = &sysctl_decnet_rmem, | |
334 | .maxlen = sizeof(sysctl_decnet_rmem), | |
335 | .mode = 0644, | |
6d9f239a | 336 | .proc_handler = proc_dointvec, |
429eb0fa YH |
337 | }, |
338 | { | |
429eb0fa YH |
339 | .procname = "decnet_wmem", |
340 | .data = &sysctl_decnet_wmem, | |
341 | .maxlen = sizeof(sysctl_decnet_wmem), | |
342 | .mode = 0644, | |
6d9f239a | 343 | .proc_handler = proc_dointvec, |
429eb0fa | 344 | }, |
1da177e4 | 345 | { |
1da177e4 LT |
346 | .procname = "debug", |
347 | .data = &decnet_debug_level, | |
348 | .maxlen = sizeof(int), | |
349 | .mode = 0644, | |
6d9f239a | 350 | .proc_handler = proc_dointvec, |
1da177e4 | 351 | }, |
f8572d8f | 352 | { } |
1da177e4 LT |
353 | }; |
354 | ||
1da177e4 LT |
355 | void dn_register_sysctl(void) |
356 | { | |
9bdcc88f | 357 | dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table); |
1da177e4 LT |
358 | } |
359 | ||
360 | void dn_unregister_sysctl(void) | |
361 | { | |
5dd3df10 | 362 | unregister_net_sysctl_table(dn_table_header); |
1da177e4 LT |
363 | } |
364 | ||
365 | #else /* CONFIG_SYSCTL */ | |
366 | void dn_unregister_sysctl(void) | |
367 | { | |
368 | } | |
369 | void dn_register_sysctl(void) | |
370 | { | |
371 | } | |
372 | ||
373 | #endif |