Root/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/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(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(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 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
354static struct ctl_path dn_path[] = {
355    { .procname = "net", },
356    { .procname = "decnet", },
357    { }
358};
359
360void dn_register_sysctl(void)
361{
362    dn_table_header = register_sysctl_paths(dn_path, dn_table);
363}
364
365void dn_unregister_sysctl(void)
366{
367    unregister_sysctl_table(dn_table_header);
368}
369
370#else /* CONFIG_SYSCTL */
371void dn_unregister_sysctl(void)
372{
373}
374void dn_register_sysctl(void)
375{
376}
377
378#endif
379

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