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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* -*- linux-c -*- |
3 | * sysctl_net_core.c: sysctl interface to net core subsystem. | |
4 | * | |
5 | * Begun April 1, 1996, Mike Shaver. | |
6 | * Added /proc/sys/net/core directory entry (empty =) ). [MS] | |
7 | */ | |
8 | ||
9 | #include <linux/mm.h> | |
10 | #include <linux/sysctl.h> | |
1da177e4 | 11 | #include <linux/module.h> |
20380731 | 12 | #include <linux/socket.h> |
a37ae408 | 13 | #include <linux/netdevice.h> |
3fff4c42 | 14 | #include <linux/ratelimit.h> |
fec5e652 | 15 | #include <linux/vmalloc.h> |
33eb9cfc | 16 | #include <linux/init.h> |
5a0e3ad6 | 17 | #include <linux/slab.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; |
fa9dd599 | 27 | static int two __maybe_unused = 2; |
b1cb59cf AK |
28 | static int min_sndbuf = SOCK_MIN_SNDBUF; |
29 | static int min_rcvbuf = SOCK_MIN_RCVBUF; | |
5f74f82e | 30 | static int max_skb_frags = MAX_SKB_FRAGS; |
cdda8891 | 31 | |
ba7a46f1 JP |
32 | static int net_msg_warn; /* Unused, but still a sysctl */ |
33 | ||
79134e6c ED |
34 | int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0; |
35 | EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net); | |
36 | ||
fec5e652 | 37 | #ifdef CONFIG_RPS |
fe2c6338 | 38 | static int rps_sock_flow_sysctl(struct ctl_table *table, int write, |
fec5e652 TH |
39 | void __user *buffer, size_t *lenp, loff_t *ppos) |
40 | { | |
41 | unsigned int orig_size, size; | |
42 | int ret, i; | |
fe2c6338 | 43 | struct ctl_table tmp = { |
fec5e652 TH |
44 | .data = &size, |
45 | .maxlen = sizeof(size), | |
46 | .mode = table->mode | |
47 | }; | |
48 | struct rps_sock_flow_table *orig_sock_table, *sock_table; | |
49 | static DEFINE_MUTEX(sock_flow_mutex); | |
50 | ||
51 | mutex_lock(&sock_flow_mutex); | |
52 | ||
6e3f7faf ED |
53 | orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, |
54 | lockdep_is_held(&sock_flow_mutex)); | |
fec5e652 TH |
55 | size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0; |
56 | ||
57 | ret = proc_dointvec(&tmp, write, buffer, lenp, ppos); | |
58 | ||
59 | if (write) { | |
60 | if (size) { | |
93c1af6c | 61 | if (size > 1<<29) { |
fec5e652 TH |
62 | /* Enforce limit to prevent overflow */ |
63 | mutex_unlock(&sock_flow_mutex); | |
64 | return -EINVAL; | |
65 | } | |
66 | size = roundup_pow_of_two(size); | |
67 | if (size != orig_size) { | |
68 | sock_table = | |
69 | vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size)); | |
70 | if (!sock_table) { | |
71 | mutex_unlock(&sock_flow_mutex); | |
72 | return -ENOMEM; | |
73 | } | |
567e4b79 | 74 | rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1; |
fec5e652 TH |
75 | sock_table->mask = size - 1; |
76 | } else | |
77 | sock_table = orig_sock_table; | |
78 | ||
79 | for (i = 0; i < size; i++) | |
80 | sock_table->ents[i] = RPS_NO_CPU; | |
81 | } else | |
82 | sock_table = NULL; | |
83 | ||
84 | if (sock_table != orig_sock_table) { | |
85 | rcu_assign_pointer(rps_sock_flow_table, sock_table); | |
13bfff25 | 86 | if (sock_table) { |
c5905afb | 87 | static_key_slow_inc(&rps_needed); |
13bfff25 ED |
88 | static_key_slow_inc(&rfs_needed); |
89 | } | |
adc9300e | 90 | if (orig_sock_table) { |
c5905afb | 91 | static_key_slow_dec(&rps_needed); |
13bfff25 | 92 | static_key_slow_dec(&rfs_needed); |
adc9300e ED |
93 | synchronize_rcu(); |
94 | vfree(orig_sock_table); | |
95 | } | |
fec5e652 TH |
96 | } |
97 | } | |
98 | ||
99 | mutex_unlock(&sock_flow_mutex); | |
100 | ||
101 | return ret; | |
102 | } | |
103 | #endif /* CONFIG_RPS */ | |
104 | ||
99bbc707 WB |
105 | #ifdef CONFIG_NET_FLOW_LIMIT |
106 | static DEFINE_MUTEX(flow_limit_update_mutex); | |
107 | ||
fe2c6338 | 108 | static int flow_limit_cpu_sysctl(struct ctl_table *table, int write, |
99bbc707 WB |
109 | void __user *buffer, size_t *lenp, |
110 | loff_t *ppos) | |
111 | { | |
112 | struct sd_flow_limit *cur; | |
113 | struct softnet_data *sd; | |
114 | cpumask_var_t mask; | |
115 | int i, len, ret = 0; | |
116 | ||
117 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) | |
118 | return -ENOMEM; | |
119 | ||
120 | if (write) { | |
121 | ret = cpumask_parse_user(buffer, *lenp, mask); | |
122 | if (ret) | |
123 | goto done; | |
124 | ||
125 | mutex_lock(&flow_limit_update_mutex); | |
126 | len = sizeof(*cur) + netdev_flow_limit_table_len; | |
127 | for_each_possible_cpu(i) { | |
128 | sd = &per_cpu(softnet_data, i); | |
129 | cur = rcu_dereference_protected(sd->flow_limit, | |
130 | lockdep_is_held(&flow_limit_update_mutex)); | |
131 | if (cur && !cpumask_test_cpu(i, mask)) { | |
132 | RCU_INIT_POINTER(sd->flow_limit, NULL); | |
133 | synchronize_rcu(); | |
134 | kfree(cur); | |
135 | } else if (!cur && cpumask_test_cpu(i, mask)) { | |
5b59d467 ED |
136 | cur = kzalloc_node(len, GFP_KERNEL, |
137 | cpu_to_node(i)); | |
99bbc707 WB |
138 | if (!cur) { |
139 | /* not unwinding previous changes */ | |
140 | ret = -ENOMEM; | |
141 | goto write_unlock; | |
142 | } | |
143 | cur->num_buckets = netdev_flow_limit_table_len; | |
144 | rcu_assign_pointer(sd->flow_limit, cur); | |
145 | } | |
146 | } | |
147 | write_unlock: | |
148 | mutex_unlock(&flow_limit_update_mutex); | |
149 | } else { | |
5f121b9a WB |
150 | char kbuf[128]; |
151 | ||
99bbc707 WB |
152 | if (*ppos || !*lenp) { |
153 | *lenp = 0; | |
154 | goto done; | |
155 | } | |
156 | ||
157 | cpumask_clear(mask); | |
158 | rcu_read_lock(); | |
159 | for_each_possible_cpu(i) { | |
160 | sd = &per_cpu(softnet_data, i); | |
161 | if (rcu_dereference(sd->flow_limit)) | |
162 | cpumask_set_cpu(i, mask); | |
163 | } | |
164 | rcu_read_unlock(); | |
165 | ||
5f121b9a | 166 | len = min(sizeof(kbuf) - 1, *lenp); |
f0906827 | 167 | len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask)); |
5f121b9a WB |
168 | if (!len) { |
169 | *lenp = 0; | |
170 | goto done; | |
171 | } | |
172 | if (len < *lenp) | |
173 | kbuf[len++] = '\n'; | |
174 | if (copy_to_user(buffer, kbuf, len)) { | |
175 | ret = -EFAULT; | |
176 | goto done; | |
177 | } | |
178 | *lenp = len; | |
179 | *ppos += len; | |
99bbc707 WB |
180 | } |
181 | ||
182 | done: | |
183 | free_cpumask_var(mask); | |
184 | return ret; | |
185 | } | |
186 | ||
fe2c6338 | 187 | static int flow_limit_table_len_sysctl(struct ctl_table *table, int write, |
99bbc707 WB |
188 | void __user *buffer, size_t *lenp, |
189 | loff_t *ppos) | |
190 | { | |
191 | unsigned int old, *ptr; | |
192 | int ret; | |
193 | ||
194 | mutex_lock(&flow_limit_update_mutex); | |
195 | ||
196 | ptr = table->data; | |
197 | old = *ptr; | |
198 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
199 | if (!ret && write && !is_power_of_2(*ptr)) { | |
200 | *ptr = old; | |
201 | ret = -EINVAL; | |
202 | } | |
203 | ||
204 | mutex_unlock(&flow_limit_update_mutex); | |
205 | return ret; | |
206 | } | |
207 | #endif /* CONFIG_NET_FLOW_LIMIT */ | |
208 | ||
6da7c8fc | 209 | #ifdef CONFIG_NET_SCHED |
210 | static int set_default_qdisc(struct ctl_table *table, int write, | |
211 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
212 | { | |
213 | char id[IFNAMSIZ]; | |
214 | struct ctl_table tbl = { | |
215 | .data = id, | |
216 | .maxlen = IFNAMSIZ, | |
217 | }; | |
218 | int ret; | |
219 | ||
220 | qdisc_get_default(id, IFNAMSIZ); | |
221 | ||
222 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); | |
223 | if (write && ret == 0) | |
224 | ret = qdisc_set_default(id); | |
225 | return ret; | |
226 | } | |
227 | #endif | |
228 | ||
3d48b53f MT |
229 | static int proc_do_dev_weight(struct ctl_table *table, int write, |
230 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
231 | { | |
232 | int ret; | |
233 | ||
234 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
235 | if (ret != 0) | |
236 | return ret; | |
237 | ||
238 | dev_rx_weight = weight_p * dev_weight_rx_bias; | |
239 | dev_tx_weight = weight_p * dev_weight_tx_bias; | |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
960fb622 ED |
244 | static int proc_do_rss_key(struct ctl_table *table, int write, |
245 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
246 | { | |
247 | struct ctl_table fake_table; | |
248 | char buf[NETDEV_RSS_KEY_LEN * 3]; | |
249 | ||
250 | snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key); | |
251 | fake_table.data = buf; | |
252 | fake_table.maxlen = sizeof(buf); | |
253 | return proc_dostring(&fake_table, write, buffer, lenp, ppos); | |
254 | } | |
255 | ||
2e4a3098 DB |
256 | #ifdef CONFIG_BPF_JIT |
257 | static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write, | |
258 | void __user *buffer, size_t *lenp, | |
259 | loff_t *ppos) | |
260 | { | |
261 | int ret, jit_enable = *(int *)table->data; | |
262 | struct ctl_table tmp = *table; | |
263 | ||
264 | if (write && !capable(CAP_SYS_ADMIN)) | |
265 | return -EPERM; | |
266 | ||
267 | tmp.data = &jit_enable; | |
268 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
269 | if (write && !ret) { | |
270 | if (jit_enable < 2 || | |
271 | (jit_enable == 2 && bpf_dump_raw_ok())) { | |
272 | *(int *)table->data = jit_enable; | |
273 | if (jit_enable == 2) | |
274 | pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n"); | |
275 | } else { | |
276 | ret = -EPERM; | |
277 | } | |
278 | } | |
279 | return ret; | |
280 | } | |
281 | ||
2e4a3098 DB |
282 | static int |
283 | proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write, | |
284 | void __user *buffer, size_t *lenp, | |
285 | loff_t *ppos) | |
286 | { | |
287 | if (!capable(CAP_SYS_ADMIN)) | |
288 | return -EPERM; | |
289 | ||
290 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
291 | } | |
2e4a3098 DB |
292 | #endif |
293 | ||
33eb9cfc | 294 | static struct ctl_table net_core_table[] = { |
1da177e4 LT |
295 | #ifdef CONFIG_NET |
296 | { | |
1da177e4 LT |
297 | .procname = "wmem_max", |
298 | .data = &sysctl_wmem_max, | |
299 | .maxlen = sizeof(int), | |
300 | .mode = 0644, | |
cdda8891 | 301 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 302 | .extra1 = &min_sndbuf, |
1da177e4 LT |
303 | }, |
304 | { | |
1da177e4 LT |
305 | .procname = "rmem_max", |
306 | .data = &sysctl_rmem_max, | |
307 | .maxlen = sizeof(int), | |
308 | .mode = 0644, | |
cdda8891 | 309 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 310 | .extra1 = &min_rcvbuf, |
1da177e4 LT |
311 | }, |
312 | { | |
1da177e4 LT |
313 | .procname = "wmem_default", |
314 | .data = &sysctl_wmem_default, | |
315 | .maxlen = sizeof(int), | |
316 | .mode = 0644, | |
cdda8891 | 317 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 318 | .extra1 = &min_sndbuf, |
1da177e4 LT |
319 | }, |
320 | { | |
1da177e4 LT |
321 | .procname = "rmem_default", |
322 | .data = &sysctl_rmem_default, | |
323 | .maxlen = sizeof(int), | |
324 | .mode = 0644, | |
cdda8891 | 325 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 326 | .extra1 = &min_rcvbuf, |
1da177e4 LT |
327 | }, |
328 | { | |
1da177e4 LT |
329 | .procname = "dev_weight", |
330 | .data = &weight_p, | |
331 | .maxlen = sizeof(int), | |
332 | .mode = 0644, | |
3d48b53f MT |
333 | .proc_handler = proc_do_dev_weight, |
334 | }, | |
335 | { | |
336 | .procname = "dev_weight_rx_bias", | |
337 | .data = &dev_weight_rx_bias, | |
338 | .maxlen = sizeof(int), | |
339 | .mode = 0644, | |
340 | .proc_handler = proc_do_dev_weight, | |
341 | }, | |
342 | { | |
343 | .procname = "dev_weight_tx_bias", | |
344 | .data = &dev_weight_tx_bias, | |
345 | .maxlen = sizeof(int), | |
346 | .mode = 0644, | |
347 | .proc_handler = proc_do_dev_weight, | |
1da177e4 LT |
348 | }, |
349 | { | |
1da177e4 LT |
350 | .procname = "netdev_max_backlog", |
351 | .data = &netdev_max_backlog, | |
352 | .maxlen = sizeof(int), | |
353 | .mode = 0644, | |
6d9f239a | 354 | .proc_handler = proc_dointvec |
1da177e4 | 355 | }, |
960fb622 ED |
356 | { |
357 | .procname = "netdev_rss_key", | |
358 | .data = &netdev_rss_key, | |
359 | .maxlen = sizeof(int), | |
360 | .mode = 0444, | |
361 | .proc_handler = proc_do_rss_key, | |
362 | }, | |
0a14842f ED |
363 | #ifdef CONFIG_BPF_JIT |
364 | { | |
365 | .procname = "bpf_jit_enable", | |
366 | .data = &bpf_jit_enable, | |
367 | .maxlen = sizeof(int), | |
368 | .mode = 0644, | |
2e4a3098 | 369 | .proc_handler = proc_dointvec_minmax_bpf_enable, |
fa9dd599 | 370 | # ifdef CONFIG_BPF_JIT_ALWAYS_ON |
290af866 AS |
371 | .extra1 = &one, |
372 | .extra2 = &one, | |
fa9dd599 DB |
373 | # else |
374 | .extra1 = &zero, | |
375 | .extra2 = &two, | |
376 | # endif | |
0a14842f | 377 | }, |
4f3446bb DB |
378 | # ifdef CONFIG_HAVE_EBPF_JIT |
379 | { | |
380 | .procname = "bpf_jit_harden", | |
381 | .data = &bpf_jit_harden, | |
382 | .maxlen = sizeof(int), | |
383 | .mode = 0600, | |
2e4a3098 | 384 | .proc_handler = proc_dointvec_minmax_bpf_restricted, |
fa9dd599 DB |
385 | .extra1 = &zero, |
386 | .extra2 = &two, | |
4f3446bb | 387 | }, |
74451e66 DB |
388 | { |
389 | .procname = "bpf_jit_kallsyms", | |
390 | .data = &bpf_jit_kallsyms, | |
391 | .maxlen = sizeof(int), | |
392 | .mode = 0600, | |
2e4a3098 | 393 | .proc_handler = proc_dointvec_minmax_bpf_restricted, |
fa9dd599 DB |
394 | .extra1 = &zero, |
395 | .extra2 = &one, | |
74451e66 | 396 | }, |
4f3446bb | 397 | # endif |
ede95a63 DB |
398 | { |
399 | .procname = "bpf_jit_limit", | |
400 | .data = &bpf_jit_limit, | |
401 | .maxlen = sizeof(int), | |
402 | .mode = 0600, | |
403 | .proc_handler = proc_dointvec_minmax_bpf_restricted, | |
404 | .extra1 = &one, | |
405 | }, | |
0a14842f | 406 | #endif |
3b098e2d ED |
407 | { |
408 | .procname = "netdev_tstamp_prequeue", | |
409 | .data = &netdev_tstamp_prequeue, | |
410 | .maxlen = sizeof(int), | |
411 | .mode = 0644, | |
412 | .proc_handler = proc_dointvec | |
413 | }, | |
1da177e4 | 414 | { |
1da177e4 | 415 | .procname = "message_cost", |
717115e1 | 416 | .data = &net_ratelimit_state.interval, |
1da177e4 LT |
417 | .maxlen = sizeof(int), |
418 | .mode = 0644, | |
6d9f239a | 419 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
420 | }, |
421 | { | |
1da177e4 | 422 | .procname = "message_burst", |
717115e1 | 423 | .data = &net_ratelimit_state.burst, |
1da177e4 LT |
424 | .maxlen = sizeof(int), |
425 | .mode = 0644, | |
6d9f239a | 426 | .proc_handler = proc_dointvec, |
1da177e4 LT |
427 | }, |
428 | { | |
1da177e4 LT |
429 | .procname = "optmem_max", |
430 | .data = &sysctl_optmem_max, | |
431 | .maxlen = sizeof(int), | |
432 | .mode = 0644, | |
6d9f239a | 433 | .proc_handler = proc_dointvec |
1da177e4 | 434 | }, |
b245be1f WB |
435 | { |
436 | .procname = "tstamp_allow_data", | |
437 | .data = &sysctl_tstamp_allow_data, | |
438 | .maxlen = sizeof(int), | |
439 | .mode = 0644, | |
440 | .proc_handler = proc_dointvec_minmax, | |
441 | .extra1 = &zero, | |
442 | .extra2 = &one | |
443 | }, | |
fec5e652 TH |
444 | #ifdef CONFIG_RPS |
445 | { | |
446 | .procname = "rps_sock_flow_entries", | |
447 | .maxlen = sizeof(int), | |
448 | .mode = 0644, | |
449 | .proc_handler = rps_sock_flow_sysctl | |
450 | }, | |
451 | #endif | |
99bbc707 WB |
452 | #ifdef CONFIG_NET_FLOW_LIMIT |
453 | { | |
454 | .procname = "flow_limit_cpu_bitmap", | |
455 | .mode = 0644, | |
456 | .proc_handler = flow_limit_cpu_sysctl | |
457 | }, | |
458 | { | |
459 | .procname = "flow_limit_table_len", | |
460 | .data = &netdev_flow_limit_table_len, | |
461 | .maxlen = sizeof(int), | |
462 | .mode = 0644, | |
463 | .proc_handler = flow_limit_table_len_sysctl | |
464 | }, | |
465 | #endif /* CONFIG_NET_FLOW_LIMIT */ | |
e0d1095a | 466 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 467 | { |
64b0dc51 ET |
468 | .procname = "busy_poll", |
469 | .data = &sysctl_net_busy_poll, | |
eb6db622 | 470 | .maxlen = sizeof(unsigned int), |
06021292 | 471 | .mode = 0644, |
95f25521 AD |
472 | .proc_handler = proc_dointvec_minmax, |
473 | .extra1 = &zero, | |
06021292 | 474 | }, |
2d48d67f | 475 | { |
64b0dc51 ET |
476 | .procname = "busy_read", |
477 | .data = &sysctl_net_busy_read, | |
2d48d67f ET |
478 | .maxlen = sizeof(unsigned int), |
479 | .mode = 0644, | |
95f25521 AD |
480 | .proc_handler = proc_dointvec_minmax, |
481 | .extra1 = &zero, | |
2d48d67f | 482 | }, |
6da7c8fc | 483 | #endif |
484 | #ifdef CONFIG_NET_SCHED | |
485 | { | |
486 | .procname = "default_qdisc", | |
487 | .mode = 0644, | |
488 | .maxlen = IFNAMSIZ, | |
489 | .proc_handler = set_default_qdisc | |
490 | }, | |
06021292 | 491 | #endif |
1da177e4 | 492 | #endif /* CONFIG_NET */ |
51b0bded | 493 | { |
51b0bded SH |
494 | .procname = "netdev_budget", |
495 | .data = &netdev_budget, | |
496 | .maxlen = sizeof(int), | |
497 | .mode = 0644, | |
6d9f239a | 498 | .proc_handler = proc_dointvec |
51b0bded | 499 | }, |
a2a316fd | 500 | { |
a2a316fd SH |
501 | .procname = "warnings", |
502 | .data = &net_msg_warn, | |
503 | .maxlen = sizeof(int), | |
504 | .mode = 0644, | |
6d9f239a | 505 | .proc_handler = proc_dointvec |
a2a316fd | 506 | }, |
5f74f82e HWR |
507 | { |
508 | .procname = "max_skb_frags", | |
509 | .data = &sysctl_max_skb_frags, | |
510 | .maxlen = sizeof(int), | |
511 | .mode = 0644, | |
512 | .proc_handler = proc_dointvec_minmax, | |
513 | .extra1 = &one, | |
514 | .extra2 = &max_skb_frags, | |
515 | }, | |
7acf8a1e MW |
516 | { |
517 | .procname = "netdev_budget_usecs", | |
518 | .data = &netdev_budget_usecs, | |
519 | .maxlen = sizeof(unsigned int), | |
520 | .mode = 0644, | |
521 | .proc_handler = proc_dointvec_minmax, | |
522 | .extra1 = &zero, | |
523 | }, | |
79134e6c ED |
524 | { |
525 | .procname = "fb_tunnels_only_for_init_net", | |
526 | .data = &sysctl_fb_tunnels_only_for_init_net, | |
527 | .maxlen = sizeof(int), | |
528 | .mode = 0644, | |
529 | .proc_handler = proc_dointvec_minmax, | |
530 | .extra1 = &zero, | |
531 | .extra2 = &one, | |
532 | }, | |
f8572d8f | 533 | { } |
1da177e4 | 534 | }; |
33eb9cfc | 535 | |
d5a4502e PE |
536 | static struct ctl_table netns_core_table[] = { |
537 | { | |
d5a4502e PE |
538 | .procname = "somaxconn", |
539 | .data = &init_net.core.sysctl_somaxconn, | |
540 | .maxlen = sizeof(int), | |
541 | .mode = 0644, | |
5f671d6b | 542 | .extra1 = &zero, |
5f671d6b | 543 | .proc_handler = proc_dointvec_minmax |
d5a4502e | 544 | }, |
f8572d8f | 545 | { } |
d5a4502e PE |
546 | }; |
547 | ||
024626e3 | 548 | static __net_init int sysctl_core_net_init(struct net *net) |
33eb9cfc | 549 | { |
d5a4502e | 550 | struct ctl_table *tbl; |
024626e3 | 551 | |
d5a4502e | 552 | tbl = netns_core_table; |
09ad9bc7 | 553 | if (!net_eq(net, &init_net)) { |
d5a4502e | 554 | tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); |
024626e3 PE |
555 | if (tbl == NULL) |
556 | goto err_dup; | |
557 | ||
d5a4502e | 558 | tbl[0].data = &net->core.sysctl_somaxconn; |
464dc801 EB |
559 | |
560 | /* Don't export any sysctls to unprivileged users */ | |
561 | if (net->user_ns != &init_user_ns) { | |
562 | tbl[0].procname = NULL; | |
563 | } | |
024626e3 PE |
564 | } |
565 | ||
ec8f23ce | 566 | net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl); |
8efa6e93 | 567 | if (net->core.sysctl_hdr == NULL) |
024626e3 | 568 | goto err_reg; |
33eb9cfc | 569 | |
024626e3 PE |
570 | return 0; |
571 | ||
572 | err_reg: | |
d5a4502e | 573 | if (tbl != netns_core_table) |
024626e3 PE |
574 | kfree(tbl); |
575 | err_dup: | |
576 | return -ENOMEM; | |
577 | } | |
578 | ||
579 | static __net_exit void sysctl_core_net_exit(struct net *net) | |
580 | { | |
581 | struct ctl_table *tbl; | |
582 | ||
8efa6e93 PE |
583 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
584 | unregister_net_sysctl_table(net->core.sysctl_hdr); | |
d5a4502e | 585 | BUG_ON(tbl == netns_core_table); |
024626e3 PE |
586 | kfree(tbl); |
587 | } | |
588 | ||
589 | static __net_initdata struct pernet_operations sysctl_core_ops = { | |
590 | .init = sysctl_core_net_init, | |
591 | .exit = sysctl_core_net_exit, | |
592 | }; | |
593 | ||
594 | static __init int sysctl_core_init(void) | |
595 | { | |
43444757 | 596 | register_net_sysctl(&init_net, "net/core", net_core_table); |
024626e3 | 597 | return register_pernet_subsys(&sysctl_core_ops); |
33eb9cfc PE |
598 | } |
599 | ||
b27aeadb | 600 | fs_initcall(sysctl_core_init); |