Commit | Line | Data |
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1da177e4 LT |
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> | |
1da177e4 | 10 | #include <linux/module.h> |
20380731 | 11 | #include <linux/socket.h> |
a37ae408 | 12 | #include <linux/netdevice.h> |
3fff4c42 | 13 | #include <linux/ratelimit.h> |
fec5e652 | 14 | #include <linux/vmalloc.h> |
33eb9cfc | 15 | #include <linux/init.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
7426a564 | 17 | #include <linux/kmemleak.h> |
3fff4c42 | 18 | |
63d819ca | 19 | #include <net/ip.h> |
20380731 | 20 | #include <net/sock.h> |
c5c177b4 | 21 | #include <net/net_ratelimit.h> |
076bb0c8 | 22 | #include <net/busy_poll.h> |
6da7c8fc | 23 | #include <net/pkt_sched.h> |
1da177e4 | 24 | |
5f671d6b | 25 | static int zero = 0; |
cdda8891 | 26 | static int one = 1; |
5f671d6b | 27 | static int ushort_max = USHRT_MAX; |
cdda8891 | 28 | |
fec5e652 | 29 | #ifdef CONFIG_RPS |
fe2c6338 | 30 | static int rps_sock_flow_sysctl(struct ctl_table *table, int write, |
fec5e652 TH |
31 | void __user *buffer, size_t *lenp, loff_t *ppos) |
32 | { | |
33 | unsigned int orig_size, size; | |
34 | int ret, i; | |
fe2c6338 | 35 | struct ctl_table tmp = { |
fec5e652 TH |
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 | ||
6e3f7faf ED |
45 | orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, |
46 | lockdep_is_held(&sock_flow_mutex)); | |
fec5e652 TH |
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); | |
adc9300e | 78 | if (sock_table) |
c5905afb | 79 | static_key_slow_inc(&rps_needed); |
adc9300e | 80 | if (orig_sock_table) { |
c5905afb | 81 | static_key_slow_dec(&rps_needed); |
adc9300e ED |
82 | synchronize_rcu(); |
83 | vfree(orig_sock_table); | |
84 | } | |
fec5e652 TH |
85 | } |
86 | } | |
87 | ||
88 | mutex_unlock(&sock_flow_mutex); | |
89 | ||
90 | return ret; | |
91 | } | |
92 | #endif /* CONFIG_RPS */ | |
93 | ||
99bbc707 WB |
94 | #ifdef CONFIG_NET_FLOW_LIMIT |
95 | static DEFINE_MUTEX(flow_limit_update_mutex); | |
96 | ||
fe2c6338 | 97 | static int flow_limit_cpu_sysctl(struct ctl_table *table, int write, |
99bbc707 WB |
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(len, GFP_KERNEL); | |
126 | if (!cur) { | |
127 | /* not unwinding previous changes */ | |
128 | ret = -ENOMEM; | |
129 | goto write_unlock; | |
130 | } | |
131 | cur->num_buckets = netdev_flow_limit_table_len; | |
132 | rcu_assign_pointer(sd->flow_limit, cur); | |
133 | } | |
134 | } | |
135 | write_unlock: | |
136 | mutex_unlock(&flow_limit_update_mutex); | |
137 | } else { | |
5f121b9a WB |
138 | char kbuf[128]; |
139 | ||
99bbc707 WB |
140 | if (*ppos || !*lenp) { |
141 | *lenp = 0; | |
142 | goto done; | |
143 | } | |
144 | ||
145 | cpumask_clear(mask); | |
146 | rcu_read_lock(); | |
147 | for_each_possible_cpu(i) { | |
148 | sd = &per_cpu(softnet_data, i); | |
149 | if (rcu_dereference(sd->flow_limit)) | |
150 | cpumask_set_cpu(i, mask); | |
151 | } | |
152 | rcu_read_unlock(); | |
153 | ||
5f121b9a WB |
154 | len = min(sizeof(kbuf) - 1, *lenp); |
155 | len = cpumask_scnprintf(kbuf, len, mask); | |
156 | if (!len) { | |
157 | *lenp = 0; | |
158 | goto done; | |
159 | } | |
160 | if (len < *lenp) | |
161 | kbuf[len++] = '\n'; | |
162 | if (copy_to_user(buffer, kbuf, len)) { | |
163 | ret = -EFAULT; | |
164 | goto done; | |
165 | } | |
166 | *lenp = len; | |
167 | *ppos += len; | |
99bbc707 WB |
168 | } |
169 | ||
170 | done: | |
171 | free_cpumask_var(mask); | |
172 | return ret; | |
173 | } | |
174 | ||
fe2c6338 | 175 | static int flow_limit_table_len_sysctl(struct ctl_table *table, int write, |
99bbc707 WB |
176 | void __user *buffer, size_t *lenp, |
177 | loff_t *ppos) | |
178 | { | |
179 | unsigned int old, *ptr; | |
180 | int ret; | |
181 | ||
182 | mutex_lock(&flow_limit_update_mutex); | |
183 | ||
184 | ptr = table->data; | |
185 | old = *ptr; | |
186 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
187 | if (!ret && write && !is_power_of_2(*ptr)) { | |
188 | *ptr = old; | |
189 | ret = -EINVAL; | |
190 | } | |
191 | ||
192 | mutex_unlock(&flow_limit_update_mutex); | |
193 | return ret; | |
194 | } | |
195 | #endif /* CONFIG_NET_FLOW_LIMIT */ | |
196 | ||
6da7c8fc | 197 | #ifdef CONFIG_NET_SCHED |
198 | static int set_default_qdisc(struct ctl_table *table, int write, | |
199 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
200 | { | |
201 | char id[IFNAMSIZ]; | |
202 | struct ctl_table tbl = { | |
203 | .data = id, | |
204 | .maxlen = IFNAMSIZ, | |
205 | }; | |
206 | int ret; | |
207 | ||
208 | qdisc_get_default(id, IFNAMSIZ); | |
209 | ||
210 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); | |
211 | if (write && ret == 0) | |
212 | ret = qdisc_set_default(id); | |
213 | return ret; | |
214 | } | |
215 | #endif | |
216 | ||
33eb9cfc | 217 | static struct ctl_table net_core_table[] = { |
1da177e4 LT |
218 | #ifdef CONFIG_NET |
219 | { | |
1da177e4 LT |
220 | .procname = "wmem_max", |
221 | .data = &sysctl_wmem_max, | |
222 | .maxlen = sizeof(int), | |
223 | .mode = 0644, | |
cdda8891 | 224 | .proc_handler = proc_dointvec_minmax, |
225 | .extra1 = &one, | |
1da177e4 LT |
226 | }, |
227 | { | |
1da177e4 LT |
228 | .procname = "rmem_max", |
229 | .data = &sysctl_rmem_max, | |
230 | .maxlen = sizeof(int), | |
231 | .mode = 0644, | |
cdda8891 | 232 | .proc_handler = proc_dointvec_minmax, |
233 | .extra1 = &one, | |
1da177e4 LT |
234 | }, |
235 | { | |
1da177e4 LT |
236 | .procname = "wmem_default", |
237 | .data = &sysctl_wmem_default, | |
238 | .maxlen = sizeof(int), | |
239 | .mode = 0644, | |
cdda8891 | 240 | .proc_handler = proc_dointvec_minmax, |
241 | .extra1 = &one, | |
1da177e4 LT |
242 | }, |
243 | { | |
1da177e4 LT |
244 | .procname = "rmem_default", |
245 | .data = &sysctl_rmem_default, | |
246 | .maxlen = sizeof(int), | |
247 | .mode = 0644, | |
cdda8891 | 248 | .proc_handler = proc_dointvec_minmax, |
249 | .extra1 = &one, | |
1da177e4 LT |
250 | }, |
251 | { | |
1da177e4 LT |
252 | .procname = "dev_weight", |
253 | .data = &weight_p, | |
254 | .maxlen = sizeof(int), | |
255 | .mode = 0644, | |
6d9f239a | 256 | .proc_handler = proc_dointvec |
1da177e4 LT |
257 | }, |
258 | { | |
1da177e4 LT |
259 | .procname = "netdev_max_backlog", |
260 | .data = &netdev_max_backlog, | |
261 | .maxlen = sizeof(int), | |
262 | .mode = 0644, | |
6d9f239a | 263 | .proc_handler = proc_dointvec |
1da177e4 | 264 | }, |
0a14842f ED |
265 | #ifdef CONFIG_BPF_JIT |
266 | { | |
267 | .procname = "bpf_jit_enable", | |
268 | .data = &bpf_jit_enable, | |
269 | .maxlen = sizeof(int), | |
270 | .mode = 0644, | |
271 | .proc_handler = proc_dointvec | |
272 | }, | |
273 | #endif | |
3b098e2d ED |
274 | { |
275 | .procname = "netdev_tstamp_prequeue", | |
276 | .data = &netdev_tstamp_prequeue, | |
277 | .maxlen = sizeof(int), | |
278 | .mode = 0644, | |
279 | .proc_handler = proc_dointvec | |
280 | }, | |
1da177e4 | 281 | { |
1da177e4 | 282 | .procname = "message_cost", |
717115e1 | 283 | .data = &net_ratelimit_state.interval, |
1da177e4 LT |
284 | .maxlen = sizeof(int), |
285 | .mode = 0644, | |
6d9f239a | 286 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
287 | }, |
288 | { | |
1da177e4 | 289 | .procname = "message_burst", |
717115e1 | 290 | .data = &net_ratelimit_state.burst, |
1da177e4 LT |
291 | .maxlen = sizeof(int), |
292 | .mode = 0644, | |
6d9f239a | 293 | .proc_handler = proc_dointvec, |
1da177e4 LT |
294 | }, |
295 | { | |
1da177e4 LT |
296 | .procname = "optmem_max", |
297 | .data = &sysctl_optmem_max, | |
298 | .maxlen = sizeof(int), | |
299 | .mode = 0644, | |
6d9f239a | 300 | .proc_handler = proc_dointvec |
1da177e4 | 301 | }, |
fec5e652 TH |
302 | #ifdef CONFIG_RPS |
303 | { | |
304 | .procname = "rps_sock_flow_entries", | |
305 | .maxlen = sizeof(int), | |
306 | .mode = 0644, | |
307 | .proc_handler = rps_sock_flow_sysctl | |
308 | }, | |
309 | #endif | |
99bbc707 WB |
310 | #ifdef CONFIG_NET_FLOW_LIMIT |
311 | { | |
312 | .procname = "flow_limit_cpu_bitmap", | |
313 | .mode = 0644, | |
314 | .proc_handler = flow_limit_cpu_sysctl | |
315 | }, | |
316 | { | |
317 | .procname = "flow_limit_table_len", | |
318 | .data = &netdev_flow_limit_table_len, | |
319 | .maxlen = sizeof(int), | |
320 | .mode = 0644, | |
321 | .proc_handler = flow_limit_table_len_sysctl | |
322 | }, | |
323 | #endif /* CONFIG_NET_FLOW_LIMIT */ | |
e0d1095a | 324 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 325 | { |
64b0dc51 ET |
326 | .procname = "busy_poll", |
327 | .data = &sysctl_net_busy_poll, | |
eb6db622 | 328 | .maxlen = sizeof(unsigned int), |
06021292 | 329 | .mode = 0644, |
eb6db622 | 330 | .proc_handler = proc_dointvec |
06021292 | 331 | }, |
2d48d67f | 332 | { |
64b0dc51 ET |
333 | .procname = "busy_read", |
334 | .data = &sysctl_net_busy_read, | |
2d48d67f ET |
335 | .maxlen = sizeof(unsigned int), |
336 | .mode = 0644, | |
337 | .proc_handler = proc_dointvec | |
338 | }, | |
6da7c8fc | 339 | #endif |
340 | #ifdef CONFIG_NET_SCHED | |
341 | { | |
342 | .procname = "default_qdisc", | |
343 | .mode = 0644, | |
344 | .maxlen = IFNAMSIZ, | |
345 | .proc_handler = set_default_qdisc | |
346 | }, | |
06021292 | 347 | #endif |
1da177e4 | 348 | #endif /* CONFIG_NET */ |
51b0bded | 349 | { |
51b0bded SH |
350 | .procname = "netdev_budget", |
351 | .data = &netdev_budget, | |
352 | .maxlen = sizeof(int), | |
353 | .mode = 0644, | |
6d9f239a | 354 | .proc_handler = proc_dointvec |
51b0bded | 355 | }, |
a2a316fd | 356 | { |
a2a316fd SH |
357 | .procname = "warnings", |
358 | .data = &net_msg_warn, | |
359 | .maxlen = sizeof(int), | |
360 | .mode = 0644, | |
6d9f239a | 361 | .proc_handler = proc_dointvec |
a2a316fd | 362 | }, |
f8572d8f | 363 | { } |
1da177e4 | 364 | }; |
33eb9cfc | 365 | |
d5a4502e PE |
366 | static struct ctl_table netns_core_table[] = { |
367 | { | |
d5a4502e PE |
368 | .procname = "somaxconn", |
369 | .data = &init_net.core.sysctl_somaxconn, | |
370 | .maxlen = sizeof(int), | |
371 | .mode = 0644, | |
5f671d6b RG |
372 | .extra1 = &zero, |
373 | .extra2 = &ushort_max, | |
374 | .proc_handler = proc_dointvec_minmax | |
d5a4502e | 375 | }, |
f8572d8f | 376 | { } |
d5a4502e PE |
377 | }; |
378 | ||
024626e3 | 379 | static __net_init int sysctl_core_net_init(struct net *net) |
33eb9cfc | 380 | { |
d5a4502e | 381 | struct ctl_table *tbl; |
024626e3 | 382 | |
8efa6e93 | 383 | net->core.sysctl_somaxconn = SOMAXCONN; |
b8e1f9b5 | 384 | |
d5a4502e | 385 | tbl = netns_core_table; |
09ad9bc7 | 386 | if (!net_eq(net, &init_net)) { |
d5a4502e | 387 | tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); |
024626e3 PE |
388 | if (tbl == NULL) |
389 | goto err_dup; | |
390 | ||
d5a4502e | 391 | tbl[0].data = &net->core.sysctl_somaxconn; |
464dc801 EB |
392 | |
393 | /* Don't export any sysctls to unprivileged users */ | |
394 | if (net->user_ns != &init_user_ns) { | |
395 | tbl[0].procname = NULL; | |
396 | } | |
024626e3 PE |
397 | } |
398 | ||
ec8f23ce | 399 | net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl); |
8efa6e93 | 400 | if (net->core.sysctl_hdr == NULL) |
024626e3 | 401 | goto err_reg; |
33eb9cfc | 402 | |
024626e3 PE |
403 | return 0; |
404 | ||
405 | err_reg: | |
d5a4502e | 406 | if (tbl != netns_core_table) |
024626e3 PE |
407 | kfree(tbl); |
408 | err_dup: | |
409 | return -ENOMEM; | |
410 | } | |
411 | ||
412 | static __net_exit void sysctl_core_net_exit(struct net *net) | |
413 | { | |
414 | struct ctl_table *tbl; | |
415 | ||
8efa6e93 PE |
416 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
417 | unregister_net_sysctl_table(net->core.sysctl_hdr); | |
d5a4502e | 418 | BUG_ON(tbl == netns_core_table); |
024626e3 PE |
419 | kfree(tbl); |
420 | } | |
421 | ||
422 | static __net_initdata struct pernet_operations sysctl_core_ops = { | |
423 | .init = sysctl_core_net_init, | |
424 | .exit = sysctl_core_net_exit, | |
425 | }; | |
426 | ||
427 | static __init int sysctl_core_init(void) | |
428 | { | |
43444757 | 429 | register_net_sysctl(&init_net, "net/core", net_core_table); |
024626e3 | 430 | return register_pernet_subsys(&sysctl_core_ops); |
33eb9cfc PE |
431 | } |
432 | ||
b27aeadb | 433 | fs_initcall(sysctl_core_init); |