Root/
1 | /* -*- linux-c -*- |
2 | * sysctl_net_core.c: sysctl interface to net core subsystem. |
3 | * |
4 | * Begun April 1, 1996, Mike Shaver. |
5 | * Added /proc/sys/net/core directory entry (empty =) ). [MS] |
6 | */ |
7 | |
8 | #include <linux/mm.h> |
9 | #include <linux/sysctl.h> |
10 | #include <linux/module.h> |
11 | #include <linux/socket.h> |
12 | #include <linux/netdevice.h> |
13 | #include <linux/ratelimit.h> |
14 | #include <linux/vmalloc.h> |
15 | #include <linux/init.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/kmemleak.h> |
18 | |
19 | #include <net/ip.h> |
20 | #include <net/sock.h> |
21 | #include <net/net_ratelimit.h> |
22 | #include <net/busy_poll.h> |
23 | #include <net/pkt_sched.h> |
24 | |
25 | static int zero = 0; |
26 | static int one = 1; |
27 | static int ushort_max = USHRT_MAX; |
28 | |
29 | #ifdef CONFIG_RPS |
30 | static int rps_sock_flow_sysctl(struct ctl_table *table, int write, |
31 | void __user *buffer, size_t *lenp, loff_t *ppos) |
32 | { |
33 | unsigned int orig_size, size; |
34 | int ret, i; |
35 | struct ctl_table tmp = { |
36 | .data = &size, |
37 | .maxlen = sizeof(size), |
38 | .mode = table->mode |
39 | }; |
40 | struct rps_sock_flow_table *orig_sock_table, *sock_table; |
41 | static DEFINE_MUTEX(sock_flow_mutex); |
42 | |
43 | mutex_lock(&sock_flow_mutex); |
44 | |
45 | orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, |
46 | lockdep_is_held(&sock_flow_mutex)); |
47 | size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0; |
48 | |
49 | ret = proc_dointvec(&tmp, write, buffer, lenp, ppos); |
50 | |
51 | if (write) { |
52 | if (size) { |
53 | if (size > 1<<30) { |
54 | /* Enforce limit to prevent overflow */ |
55 | mutex_unlock(&sock_flow_mutex); |
56 | return -EINVAL; |
57 | } |
58 | size = roundup_pow_of_two(size); |
59 | if (size != orig_size) { |
60 | sock_table = |
61 | vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size)); |
62 | if (!sock_table) { |
63 | mutex_unlock(&sock_flow_mutex); |
64 | return -ENOMEM; |
65 | } |
66 | |
67 | sock_table->mask = size - 1; |
68 | } else |
69 | sock_table = orig_sock_table; |
70 | |
71 | for (i = 0; i < size; i++) |
72 | sock_table->ents[i] = RPS_NO_CPU; |
73 | } else |
74 | sock_table = NULL; |
75 | |
76 | if (sock_table != orig_sock_table) { |
77 | rcu_assign_pointer(rps_sock_flow_table, sock_table); |
78 | if (sock_table) |
79 | static_key_slow_inc(&rps_needed); |
80 | if (orig_sock_table) { |
81 | static_key_slow_dec(&rps_needed); |
82 | synchronize_rcu(); |
83 | vfree(orig_sock_table); |
84 | } |
85 | } |
86 | } |
87 | |
88 | mutex_unlock(&sock_flow_mutex); |
89 | |
90 | return ret; |
91 | } |
92 | #endif /* CONFIG_RPS */ |
93 | |
94 | #ifdef CONFIG_NET_FLOW_LIMIT |
95 | static DEFINE_MUTEX(flow_limit_update_mutex); |
96 | |
97 | static int flow_limit_cpu_sysctl(struct ctl_table *table, int write, |
98 | void __user *buffer, size_t *lenp, |
99 | loff_t *ppos) |
100 | { |
101 | struct sd_flow_limit *cur; |
102 | struct softnet_data *sd; |
103 | cpumask_var_t mask; |
104 | int i, len, ret = 0; |
105 | |
106 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
107 | return -ENOMEM; |
108 | |
109 | if (write) { |
110 | ret = cpumask_parse_user(buffer, *lenp, mask); |
111 | if (ret) |
112 | goto done; |
113 | |
114 | mutex_lock(&flow_limit_update_mutex); |
115 | len = sizeof(*cur) + netdev_flow_limit_table_len; |
116 | for_each_possible_cpu(i) { |
117 | sd = &per_cpu(softnet_data, i); |
118 | cur = rcu_dereference_protected(sd->flow_limit, |
119 | lockdep_is_held(&flow_limit_update_mutex)); |
120 | if (cur && !cpumask_test_cpu(i, mask)) { |
121 | RCU_INIT_POINTER(sd->flow_limit, NULL); |
122 | synchronize_rcu(); |
123 | kfree(cur); |
124 | } else if (!cur && cpumask_test_cpu(i, mask)) { |
125 | cur = kzalloc_node(len, GFP_KERNEL, |
126 | cpu_to_node(i)); |
127 | if (!cur) { |
128 | /* not unwinding previous changes */ |
129 | ret = -ENOMEM; |
130 | goto write_unlock; |
131 | } |
132 | cur->num_buckets = netdev_flow_limit_table_len; |
133 | rcu_assign_pointer(sd->flow_limit, cur); |
134 | } |
135 | } |
136 | write_unlock: |
137 | mutex_unlock(&flow_limit_update_mutex); |
138 | } else { |
139 | char kbuf[128]; |
140 | |
141 | if (*ppos || !*lenp) { |
142 | *lenp = 0; |
143 | goto done; |
144 | } |
145 | |
146 | cpumask_clear(mask); |
147 | rcu_read_lock(); |
148 | for_each_possible_cpu(i) { |
149 | sd = &per_cpu(softnet_data, i); |
150 | if (rcu_dereference(sd->flow_limit)) |
151 | cpumask_set_cpu(i, mask); |
152 | } |
153 | rcu_read_unlock(); |
154 | |
155 | len = min(sizeof(kbuf) - 1, *lenp); |
156 | len = cpumask_scnprintf(kbuf, len, mask); |
157 | if (!len) { |
158 | *lenp = 0; |
159 | goto done; |
160 | } |
161 | if (len < *lenp) |
162 | kbuf[len++] = '\n'; |
163 | if (copy_to_user(buffer, kbuf, len)) { |
164 | ret = -EFAULT; |
165 | goto done; |
166 | } |
167 | *lenp = len; |
168 | *ppos += len; |
169 | } |
170 | |
171 | done: |
172 | free_cpumask_var(mask); |
173 | return ret; |
174 | } |
175 | |
176 | static int flow_limit_table_len_sysctl(struct ctl_table *table, int write, |
177 | void __user *buffer, size_t *lenp, |
178 | loff_t *ppos) |
179 | { |
180 | unsigned int old, *ptr; |
181 | int ret; |
182 | |
183 | mutex_lock(&flow_limit_update_mutex); |
184 | |
185 | ptr = table->data; |
186 | old = *ptr; |
187 | ret = proc_dointvec(table, write, buffer, lenp, ppos); |
188 | if (!ret && write && !is_power_of_2(*ptr)) { |
189 | *ptr = old; |
190 | ret = -EINVAL; |
191 | } |
192 | |
193 | mutex_unlock(&flow_limit_update_mutex); |
194 | return ret; |
195 | } |
196 | #endif /* CONFIG_NET_FLOW_LIMIT */ |
197 | |
198 | #ifdef CONFIG_NET_SCHED |
199 | static int set_default_qdisc(struct ctl_table *table, int write, |
200 | void __user *buffer, size_t *lenp, loff_t *ppos) |
201 | { |
202 | char id[IFNAMSIZ]; |
203 | struct ctl_table tbl = { |
204 | .data = id, |
205 | .maxlen = IFNAMSIZ, |
206 | }; |
207 | int ret; |
208 | |
209 | qdisc_get_default(id, IFNAMSIZ); |
210 | |
211 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); |
212 | if (write && ret == 0) |
213 | ret = qdisc_set_default(id); |
214 | return ret; |
215 | } |
216 | #endif |
217 | |
218 | static struct ctl_table net_core_table[] = { |
219 | #ifdef CONFIG_NET |
220 | { |
221 | .procname = "wmem_max", |
222 | .data = &sysctl_wmem_max, |
223 | .maxlen = sizeof(int), |
224 | .mode = 0644, |
225 | .proc_handler = proc_dointvec_minmax, |
226 | .extra1 = &one, |
227 | }, |
228 | { |
229 | .procname = "rmem_max", |
230 | .data = &sysctl_rmem_max, |
231 | .maxlen = sizeof(int), |
232 | .mode = 0644, |
233 | .proc_handler = proc_dointvec_minmax, |
234 | .extra1 = &one, |
235 | }, |
236 | { |
237 | .procname = "wmem_default", |
238 | .data = &sysctl_wmem_default, |
239 | .maxlen = sizeof(int), |
240 | .mode = 0644, |
241 | .proc_handler = proc_dointvec_minmax, |
242 | .extra1 = &one, |
243 | }, |
244 | { |
245 | .procname = "rmem_default", |
246 | .data = &sysctl_rmem_default, |
247 | .maxlen = sizeof(int), |
248 | .mode = 0644, |
249 | .proc_handler = proc_dointvec_minmax, |
250 | .extra1 = &one, |
251 | }, |
252 | { |
253 | .procname = "dev_weight", |
254 | .data = &weight_p, |
255 | .maxlen = sizeof(int), |
256 | .mode = 0644, |
257 | .proc_handler = proc_dointvec |
258 | }, |
259 | { |
260 | .procname = "netdev_max_backlog", |
261 | .data = &netdev_max_backlog, |
262 | .maxlen = sizeof(int), |
263 | .mode = 0644, |
264 | .proc_handler = proc_dointvec |
265 | }, |
266 | #ifdef CONFIG_BPF_JIT |
267 | { |
268 | .procname = "bpf_jit_enable", |
269 | .data = &bpf_jit_enable, |
270 | .maxlen = sizeof(int), |
271 | .mode = 0644, |
272 | .proc_handler = proc_dointvec |
273 | }, |
274 | #endif |
275 | { |
276 | .procname = "netdev_tstamp_prequeue", |
277 | .data = &netdev_tstamp_prequeue, |
278 | .maxlen = sizeof(int), |
279 | .mode = 0644, |
280 | .proc_handler = proc_dointvec |
281 | }, |
282 | { |
283 | .procname = "message_cost", |
284 | .data = &net_ratelimit_state.interval, |
285 | .maxlen = sizeof(int), |
286 | .mode = 0644, |
287 | .proc_handler = proc_dointvec_jiffies, |
288 | }, |
289 | { |
290 | .procname = "message_burst", |
291 | .data = &net_ratelimit_state.burst, |
292 | .maxlen = sizeof(int), |
293 | .mode = 0644, |
294 | .proc_handler = proc_dointvec, |
295 | }, |
296 | { |
297 | .procname = "optmem_max", |
298 | .data = &sysctl_optmem_max, |
299 | .maxlen = sizeof(int), |
300 | .mode = 0644, |
301 | .proc_handler = proc_dointvec |
302 | }, |
303 | #ifdef CONFIG_RPS |
304 | { |
305 | .procname = "rps_sock_flow_entries", |
306 | .maxlen = sizeof(int), |
307 | .mode = 0644, |
308 | .proc_handler = rps_sock_flow_sysctl |
309 | }, |
310 | #endif |
311 | #ifdef CONFIG_NET_FLOW_LIMIT |
312 | { |
313 | .procname = "flow_limit_cpu_bitmap", |
314 | .mode = 0644, |
315 | .proc_handler = flow_limit_cpu_sysctl |
316 | }, |
317 | { |
318 | .procname = "flow_limit_table_len", |
319 | .data = &netdev_flow_limit_table_len, |
320 | .maxlen = sizeof(int), |
321 | .mode = 0644, |
322 | .proc_handler = flow_limit_table_len_sysctl |
323 | }, |
324 | #endif /* CONFIG_NET_FLOW_LIMIT */ |
325 | #ifdef CONFIG_NET_RX_BUSY_POLL |
326 | { |
327 | .procname = "busy_poll", |
328 | .data = &sysctl_net_busy_poll, |
329 | .maxlen = sizeof(unsigned int), |
330 | .mode = 0644, |
331 | .proc_handler = proc_dointvec |
332 | }, |
333 | { |
334 | .procname = "busy_read", |
335 | .data = &sysctl_net_busy_read, |
336 | .maxlen = sizeof(unsigned int), |
337 | .mode = 0644, |
338 | .proc_handler = proc_dointvec |
339 | }, |
340 | #endif |
341 | #ifdef CONFIG_NET_SCHED |
342 | { |
343 | .procname = "default_qdisc", |
344 | .mode = 0644, |
345 | .maxlen = IFNAMSIZ, |
346 | .proc_handler = set_default_qdisc |
347 | }, |
348 | #endif |
349 | #endif /* CONFIG_NET */ |
350 | { |
351 | .procname = "netdev_budget", |
352 | .data = &netdev_budget, |
353 | .maxlen = sizeof(int), |
354 | .mode = 0644, |
355 | .proc_handler = proc_dointvec |
356 | }, |
357 | { |
358 | .procname = "warnings", |
359 | .data = &net_msg_warn, |
360 | .maxlen = sizeof(int), |
361 | .mode = 0644, |
362 | .proc_handler = proc_dointvec |
363 | }, |
364 | { } |
365 | }; |
366 | |
367 | static struct ctl_table netns_core_table[] = { |
368 | { |
369 | .procname = "somaxconn", |
370 | .data = &init_net.core.sysctl_somaxconn, |
371 | .maxlen = sizeof(int), |
372 | .mode = 0644, |
373 | .extra1 = &zero, |
374 | .extra2 = &ushort_max, |
375 | .proc_handler = proc_dointvec_minmax |
376 | }, |
377 | { } |
378 | }; |
379 | |
380 | static __net_init int sysctl_core_net_init(struct net *net) |
381 | { |
382 | struct ctl_table *tbl; |
383 | |
384 | net->core.sysctl_somaxconn = SOMAXCONN; |
385 | |
386 | tbl = netns_core_table; |
387 | if (!net_eq(net, &init_net)) { |
388 | tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); |
389 | if (tbl == NULL) |
390 | goto err_dup; |
391 | |
392 | tbl[0].data = &net->core.sysctl_somaxconn; |
393 | |
394 | /* Don't export any sysctls to unprivileged users */ |
395 | if (net->user_ns != &init_user_ns) { |
396 | tbl[0].procname = NULL; |
397 | } |
398 | } |
399 | |
400 | net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl); |
401 | if (net->core.sysctl_hdr == NULL) |
402 | goto err_reg; |
403 | |
404 | return 0; |
405 | |
406 | err_reg: |
407 | if (tbl != netns_core_table) |
408 | kfree(tbl); |
409 | err_dup: |
410 | return -ENOMEM; |
411 | } |
412 | |
413 | static __net_exit void sysctl_core_net_exit(struct net *net) |
414 | { |
415 | struct ctl_table *tbl; |
416 | |
417 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
418 | unregister_net_sysctl_table(net->core.sysctl_hdr); |
419 | BUG_ON(tbl == netns_core_table); |
420 | kfree(tbl); |
421 | } |
422 | |
423 | static __net_initdata struct pernet_operations sysctl_core_ops = { |
424 | .init = sysctl_core_net_init, |
425 | .exit = sysctl_core_net_exit, |
426 | }; |
427 | |
428 | static __init int sysctl_core_init(void) |
429 | { |
430 | register_net_sysctl(&init_net, "net/core", net_core_table); |
431 | return register_pernet_subsys(&sysctl_core_ops); |
432 | } |
433 | |
434 | fs_initcall(sysctl_core_init); |
435 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9