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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; |
fdadd049 DB |
31 | static long long_one __maybe_unused = 1; |
32 | static long long_max __maybe_unused = LONG_MAX; | |
cdda8891 | 33 | |
ba7a46f1 JP |
34 | static int net_msg_warn; /* Unused, but still a sysctl */ |
35 | ||
79134e6c ED |
36 | int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0; |
37 | EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net); | |
38 | ||
fec5e652 | 39 | #ifdef CONFIG_RPS |
fe2c6338 | 40 | static int rps_sock_flow_sysctl(struct ctl_table *table, int write, |
fec5e652 TH |
41 | void __user *buffer, size_t *lenp, loff_t *ppos) |
42 | { | |
43 | unsigned int orig_size, size; | |
44 | int ret, i; | |
fe2c6338 | 45 | struct ctl_table tmp = { |
fec5e652 TH |
46 | .data = &size, |
47 | .maxlen = sizeof(size), | |
48 | .mode = table->mode | |
49 | }; | |
50 | struct rps_sock_flow_table *orig_sock_table, *sock_table; | |
51 | static DEFINE_MUTEX(sock_flow_mutex); | |
52 | ||
53 | mutex_lock(&sock_flow_mutex); | |
54 | ||
6e3f7faf ED |
55 | orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, |
56 | lockdep_is_held(&sock_flow_mutex)); | |
fec5e652 TH |
57 | size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0; |
58 | ||
59 | ret = proc_dointvec(&tmp, write, buffer, lenp, ppos); | |
60 | ||
61 | if (write) { | |
62 | if (size) { | |
93c1af6c | 63 | if (size > 1<<29) { |
fec5e652 TH |
64 | /* Enforce limit to prevent overflow */ |
65 | mutex_unlock(&sock_flow_mutex); | |
66 | return -EINVAL; | |
67 | } | |
68 | size = roundup_pow_of_two(size); | |
69 | if (size != orig_size) { | |
70 | sock_table = | |
71 | vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size)); | |
72 | if (!sock_table) { | |
73 | mutex_unlock(&sock_flow_mutex); | |
74 | return -ENOMEM; | |
75 | } | |
567e4b79 | 76 | rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1; |
fec5e652 TH |
77 | sock_table->mask = size - 1; |
78 | } else | |
79 | sock_table = orig_sock_table; | |
80 | ||
81 | for (i = 0; i < size; i++) | |
82 | sock_table->ents[i] = RPS_NO_CPU; | |
83 | } else | |
84 | sock_table = NULL; | |
85 | ||
86 | if (sock_table != orig_sock_table) { | |
87 | rcu_assign_pointer(rps_sock_flow_table, sock_table); | |
13bfff25 | 88 | if (sock_table) { |
c5905afb | 89 | static_key_slow_inc(&rps_needed); |
13bfff25 ED |
90 | static_key_slow_inc(&rfs_needed); |
91 | } | |
adc9300e | 92 | if (orig_sock_table) { |
c5905afb | 93 | static_key_slow_dec(&rps_needed); |
13bfff25 | 94 | static_key_slow_dec(&rfs_needed); |
adc9300e ED |
95 | synchronize_rcu(); |
96 | vfree(orig_sock_table); | |
97 | } | |
fec5e652 TH |
98 | } |
99 | } | |
100 | ||
101 | mutex_unlock(&sock_flow_mutex); | |
102 | ||
103 | return ret; | |
104 | } | |
105 | #endif /* CONFIG_RPS */ | |
106 | ||
99bbc707 WB |
107 | #ifdef CONFIG_NET_FLOW_LIMIT |
108 | static DEFINE_MUTEX(flow_limit_update_mutex); | |
109 | ||
fe2c6338 | 110 | static int flow_limit_cpu_sysctl(struct ctl_table *table, int write, |
99bbc707 WB |
111 | void __user *buffer, size_t *lenp, |
112 | loff_t *ppos) | |
113 | { | |
114 | struct sd_flow_limit *cur; | |
115 | struct softnet_data *sd; | |
116 | cpumask_var_t mask; | |
117 | int i, len, ret = 0; | |
118 | ||
119 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) | |
120 | return -ENOMEM; | |
121 | ||
122 | if (write) { | |
123 | ret = cpumask_parse_user(buffer, *lenp, mask); | |
124 | if (ret) | |
125 | goto done; | |
126 | ||
127 | mutex_lock(&flow_limit_update_mutex); | |
128 | len = sizeof(*cur) + netdev_flow_limit_table_len; | |
129 | for_each_possible_cpu(i) { | |
130 | sd = &per_cpu(softnet_data, i); | |
131 | cur = rcu_dereference_protected(sd->flow_limit, | |
132 | lockdep_is_held(&flow_limit_update_mutex)); | |
133 | if (cur && !cpumask_test_cpu(i, mask)) { | |
134 | RCU_INIT_POINTER(sd->flow_limit, NULL); | |
135 | synchronize_rcu(); | |
136 | kfree(cur); | |
137 | } else if (!cur && cpumask_test_cpu(i, mask)) { | |
5b59d467 ED |
138 | cur = kzalloc_node(len, GFP_KERNEL, |
139 | cpu_to_node(i)); | |
99bbc707 WB |
140 | if (!cur) { |
141 | /* not unwinding previous changes */ | |
142 | ret = -ENOMEM; | |
143 | goto write_unlock; | |
144 | } | |
145 | cur->num_buckets = netdev_flow_limit_table_len; | |
146 | rcu_assign_pointer(sd->flow_limit, cur); | |
147 | } | |
148 | } | |
149 | write_unlock: | |
150 | mutex_unlock(&flow_limit_update_mutex); | |
151 | } else { | |
5f121b9a WB |
152 | char kbuf[128]; |
153 | ||
99bbc707 WB |
154 | if (*ppos || !*lenp) { |
155 | *lenp = 0; | |
156 | goto done; | |
157 | } | |
158 | ||
159 | cpumask_clear(mask); | |
160 | rcu_read_lock(); | |
161 | for_each_possible_cpu(i) { | |
162 | sd = &per_cpu(softnet_data, i); | |
163 | if (rcu_dereference(sd->flow_limit)) | |
164 | cpumask_set_cpu(i, mask); | |
165 | } | |
166 | rcu_read_unlock(); | |
167 | ||
5f121b9a | 168 | len = min(sizeof(kbuf) - 1, *lenp); |
f0906827 | 169 | len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask)); |
5f121b9a WB |
170 | if (!len) { |
171 | *lenp = 0; | |
172 | goto done; | |
173 | } | |
174 | if (len < *lenp) | |
175 | kbuf[len++] = '\n'; | |
176 | if (copy_to_user(buffer, kbuf, len)) { | |
177 | ret = -EFAULT; | |
178 | goto done; | |
179 | } | |
180 | *lenp = len; | |
181 | *ppos += len; | |
99bbc707 WB |
182 | } |
183 | ||
184 | done: | |
185 | free_cpumask_var(mask); | |
186 | return ret; | |
187 | } | |
188 | ||
fe2c6338 | 189 | static int flow_limit_table_len_sysctl(struct ctl_table *table, int write, |
99bbc707 WB |
190 | void __user *buffer, size_t *lenp, |
191 | loff_t *ppos) | |
192 | { | |
193 | unsigned int old, *ptr; | |
194 | int ret; | |
195 | ||
196 | mutex_lock(&flow_limit_update_mutex); | |
197 | ||
198 | ptr = table->data; | |
199 | old = *ptr; | |
200 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
201 | if (!ret && write && !is_power_of_2(*ptr)) { | |
202 | *ptr = old; | |
203 | ret = -EINVAL; | |
204 | } | |
205 | ||
206 | mutex_unlock(&flow_limit_update_mutex); | |
207 | return ret; | |
208 | } | |
209 | #endif /* CONFIG_NET_FLOW_LIMIT */ | |
210 | ||
6da7c8fc | 211 | #ifdef CONFIG_NET_SCHED |
212 | static int set_default_qdisc(struct ctl_table *table, int write, | |
213 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
214 | { | |
215 | char id[IFNAMSIZ]; | |
216 | struct ctl_table tbl = { | |
217 | .data = id, | |
218 | .maxlen = IFNAMSIZ, | |
219 | }; | |
220 | int ret; | |
221 | ||
222 | qdisc_get_default(id, IFNAMSIZ); | |
223 | ||
224 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); | |
225 | if (write && ret == 0) | |
226 | ret = qdisc_set_default(id); | |
227 | return ret; | |
228 | } | |
229 | #endif | |
230 | ||
3d48b53f MT |
231 | static int proc_do_dev_weight(struct ctl_table *table, int write, |
232 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
233 | { | |
234 | int ret; | |
235 | ||
236 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
237 | if (ret != 0) | |
238 | return ret; | |
239 | ||
240 | dev_rx_weight = weight_p * dev_weight_rx_bias; | |
241 | dev_tx_weight = weight_p * dev_weight_tx_bias; | |
242 | ||
243 | return ret; | |
244 | } | |
245 | ||
960fb622 ED |
246 | static int proc_do_rss_key(struct ctl_table *table, int write, |
247 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
248 | { | |
249 | struct ctl_table fake_table; | |
250 | char buf[NETDEV_RSS_KEY_LEN * 3]; | |
251 | ||
252 | snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key); | |
253 | fake_table.data = buf; | |
254 | fake_table.maxlen = sizeof(buf); | |
255 | return proc_dostring(&fake_table, write, buffer, lenp, ppos); | |
256 | } | |
257 | ||
2e4a3098 DB |
258 | #ifdef CONFIG_BPF_JIT |
259 | static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write, | |
260 | void __user *buffer, size_t *lenp, | |
261 | loff_t *ppos) | |
262 | { | |
263 | int ret, jit_enable = *(int *)table->data; | |
264 | struct ctl_table tmp = *table; | |
265 | ||
266 | if (write && !capable(CAP_SYS_ADMIN)) | |
267 | return -EPERM; | |
268 | ||
269 | tmp.data = &jit_enable; | |
270 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
271 | if (write && !ret) { | |
272 | if (jit_enable < 2 || | |
273 | (jit_enable == 2 && bpf_dump_raw_ok())) { | |
274 | *(int *)table->data = jit_enable; | |
275 | if (jit_enable == 2) | |
276 | pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n"); | |
277 | } else { | |
278 | ret = -EPERM; | |
279 | } | |
280 | } | |
281 | return ret; | |
282 | } | |
283 | ||
2e4a3098 DB |
284 | static int |
285 | proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write, | |
286 | void __user *buffer, size_t *lenp, | |
287 | loff_t *ppos) | |
288 | { | |
289 | if (!capable(CAP_SYS_ADMIN)) | |
290 | return -EPERM; | |
291 | ||
292 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
293 | } | |
fdadd049 DB |
294 | |
295 | static int | |
296 | proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write, | |
297 | void __user *buffer, size_t *lenp, | |
298 | loff_t *ppos) | |
299 | { | |
300 | if (!capable(CAP_SYS_ADMIN)) | |
301 | return -EPERM; | |
302 | ||
303 | return proc_doulongvec_minmax(table, write, buffer, lenp, ppos); | |
304 | } | |
2e4a3098 DB |
305 | #endif |
306 | ||
33eb9cfc | 307 | static struct ctl_table net_core_table[] = { |
1da177e4 LT |
308 | #ifdef CONFIG_NET |
309 | { | |
1da177e4 LT |
310 | .procname = "wmem_max", |
311 | .data = &sysctl_wmem_max, | |
312 | .maxlen = sizeof(int), | |
313 | .mode = 0644, | |
cdda8891 | 314 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 315 | .extra1 = &min_sndbuf, |
1da177e4 LT |
316 | }, |
317 | { | |
1da177e4 LT |
318 | .procname = "rmem_max", |
319 | .data = &sysctl_rmem_max, | |
320 | .maxlen = sizeof(int), | |
321 | .mode = 0644, | |
cdda8891 | 322 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 323 | .extra1 = &min_rcvbuf, |
1da177e4 LT |
324 | }, |
325 | { | |
1da177e4 LT |
326 | .procname = "wmem_default", |
327 | .data = &sysctl_wmem_default, | |
328 | .maxlen = sizeof(int), | |
329 | .mode = 0644, | |
cdda8891 | 330 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 331 | .extra1 = &min_sndbuf, |
1da177e4 LT |
332 | }, |
333 | { | |
1da177e4 LT |
334 | .procname = "rmem_default", |
335 | .data = &sysctl_rmem_default, | |
336 | .maxlen = sizeof(int), | |
337 | .mode = 0644, | |
cdda8891 | 338 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 339 | .extra1 = &min_rcvbuf, |
1da177e4 LT |
340 | }, |
341 | { | |
1da177e4 LT |
342 | .procname = "dev_weight", |
343 | .data = &weight_p, | |
344 | .maxlen = sizeof(int), | |
345 | .mode = 0644, | |
3d48b53f MT |
346 | .proc_handler = proc_do_dev_weight, |
347 | }, | |
348 | { | |
349 | .procname = "dev_weight_rx_bias", | |
350 | .data = &dev_weight_rx_bias, | |
351 | .maxlen = sizeof(int), | |
352 | .mode = 0644, | |
353 | .proc_handler = proc_do_dev_weight, | |
354 | }, | |
355 | { | |
356 | .procname = "dev_weight_tx_bias", | |
357 | .data = &dev_weight_tx_bias, | |
358 | .maxlen = sizeof(int), | |
359 | .mode = 0644, | |
360 | .proc_handler = proc_do_dev_weight, | |
1da177e4 LT |
361 | }, |
362 | { | |
1da177e4 LT |
363 | .procname = "netdev_max_backlog", |
364 | .data = &netdev_max_backlog, | |
365 | .maxlen = sizeof(int), | |
366 | .mode = 0644, | |
6d9f239a | 367 | .proc_handler = proc_dointvec |
1da177e4 | 368 | }, |
960fb622 ED |
369 | { |
370 | .procname = "netdev_rss_key", | |
371 | .data = &netdev_rss_key, | |
372 | .maxlen = sizeof(int), | |
373 | .mode = 0444, | |
374 | .proc_handler = proc_do_rss_key, | |
375 | }, | |
0a14842f ED |
376 | #ifdef CONFIG_BPF_JIT |
377 | { | |
378 | .procname = "bpf_jit_enable", | |
379 | .data = &bpf_jit_enable, | |
380 | .maxlen = sizeof(int), | |
381 | .mode = 0644, | |
2e4a3098 | 382 | .proc_handler = proc_dointvec_minmax_bpf_enable, |
fa9dd599 | 383 | # ifdef CONFIG_BPF_JIT_ALWAYS_ON |
290af866 AS |
384 | .extra1 = &one, |
385 | .extra2 = &one, | |
fa9dd599 DB |
386 | # else |
387 | .extra1 = &zero, | |
388 | .extra2 = &two, | |
389 | # endif | |
0a14842f | 390 | }, |
4f3446bb DB |
391 | # ifdef CONFIG_HAVE_EBPF_JIT |
392 | { | |
393 | .procname = "bpf_jit_harden", | |
394 | .data = &bpf_jit_harden, | |
395 | .maxlen = sizeof(int), | |
396 | .mode = 0600, | |
2e4a3098 | 397 | .proc_handler = proc_dointvec_minmax_bpf_restricted, |
fa9dd599 DB |
398 | .extra1 = &zero, |
399 | .extra2 = &two, | |
4f3446bb | 400 | }, |
74451e66 DB |
401 | { |
402 | .procname = "bpf_jit_kallsyms", | |
403 | .data = &bpf_jit_kallsyms, | |
404 | .maxlen = sizeof(int), | |
405 | .mode = 0600, | |
2e4a3098 | 406 | .proc_handler = proc_dointvec_minmax_bpf_restricted, |
fa9dd599 DB |
407 | .extra1 = &zero, |
408 | .extra2 = &one, | |
74451e66 | 409 | }, |
4f3446bb | 410 | # endif |
ede95a63 DB |
411 | { |
412 | .procname = "bpf_jit_limit", | |
413 | .data = &bpf_jit_limit, | |
fdadd049 | 414 | .maxlen = sizeof(long), |
ede95a63 | 415 | .mode = 0600, |
fdadd049 DB |
416 | .proc_handler = proc_dolongvec_minmax_bpf_restricted, |
417 | .extra1 = &long_one, | |
418 | .extra2 = &long_max, | |
ede95a63 | 419 | }, |
0a14842f | 420 | #endif |
3b098e2d ED |
421 | { |
422 | .procname = "netdev_tstamp_prequeue", | |
423 | .data = &netdev_tstamp_prequeue, | |
424 | .maxlen = sizeof(int), | |
425 | .mode = 0644, | |
426 | .proc_handler = proc_dointvec | |
427 | }, | |
1da177e4 | 428 | { |
1da177e4 | 429 | .procname = "message_cost", |
717115e1 | 430 | .data = &net_ratelimit_state.interval, |
1da177e4 LT |
431 | .maxlen = sizeof(int), |
432 | .mode = 0644, | |
6d9f239a | 433 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
434 | }, |
435 | { | |
1da177e4 | 436 | .procname = "message_burst", |
717115e1 | 437 | .data = &net_ratelimit_state.burst, |
1da177e4 LT |
438 | .maxlen = sizeof(int), |
439 | .mode = 0644, | |
6d9f239a | 440 | .proc_handler = proc_dointvec, |
1da177e4 LT |
441 | }, |
442 | { | |
1da177e4 LT |
443 | .procname = "optmem_max", |
444 | .data = &sysctl_optmem_max, | |
445 | .maxlen = sizeof(int), | |
446 | .mode = 0644, | |
6d9f239a | 447 | .proc_handler = proc_dointvec |
1da177e4 | 448 | }, |
b245be1f WB |
449 | { |
450 | .procname = "tstamp_allow_data", | |
451 | .data = &sysctl_tstamp_allow_data, | |
452 | .maxlen = sizeof(int), | |
453 | .mode = 0644, | |
454 | .proc_handler = proc_dointvec_minmax, | |
455 | .extra1 = &zero, | |
456 | .extra2 = &one | |
457 | }, | |
fec5e652 TH |
458 | #ifdef CONFIG_RPS |
459 | { | |
460 | .procname = "rps_sock_flow_entries", | |
461 | .maxlen = sizeof(int), | |
462 | .mode = 0644, | |
463 | .proc_handler = rps_sock_flow_sysctl | |
464 | }, | |
465 | #endif | |
99bbc707 WB |
466 | #ifdef CONFIG_NET_FLOW_LIMIT |
467 | { | |
468 | .procname = "flow_limit_cpu_bitmap", | |
469 | .mode = 0644, | |
470 | .proc_handler = flow_limit_cpu_sysctl | |
471 | }, | |
472 | { | |
473 | .procname = "flow_limit_table_len", | |
474 | .data = &netdev_flow_limit_table_len, | |
475 | .maxlen = sizeof(int), | |
476 | .mode = 0644, | |
477 | .proc_handler = flow_limit_table_len_sysctl | |
478 | }, | |
479 | #endif /* CONFIG_NET_FLOW_LIMIT */ | |
e0d1095a | 480 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 481 | { |
64b0dc51 ET |
482 | .procname = "busy_poll", |
483 | .data = &sysctl_net_busy_poll, | |
eb6db622 | 484 | .maxlen = sizeof(unsigned int), |
06021292 | 485 | .mode = 0644, |
95f25521 AD |
486 | .proc_handler = proc_dointvec_minmax, |
487 | .extra1 = &zero, | |
06021292 | 488 | }, |
2d48d67f | 489 | { |
64b0dc51 ET |
490 | .procname = "busy_read", |
491 | .data = &sysctl_net_busy_read, | |
2d48d67f ET |
492 | .maxlen = sizeof(unsigned int), |
493 | .mode = 0644, | |
95f25521 AD |
494 | .proc_handler = proc_dointvec_minmax, |
495 | .extra1 = &zero, | |
2d48d67f | 496 | }, |
6da7c8fc | 497 | #endif |
498 | #ifdef CONFIG_NET_SCHED | |
499 | { | |
500 | .procname = "default_qdisc", | |
501 | .mode = 0644, | |
502 | .maxlen = IFNAMSIZ, | |
503 | .proc_handler = set_default_qdisc | |
504 | }, | |
06021292 | 505 | #endif |
1da177e4 | 506 | #endif /* CONFIG_NET */ |
51b0bded | 507 | { |
51b0bded SH |
508 | .procname = "netdev_budget", |
509 | .data = &netdev_budget, | |
510 | .maxlen = sizeof(int), | |
511 | .mode = 0644, | |
6d9f239a | 512 | .proc_handler = proc_dointvec |
51b0bded | 513 | }, |
a2a316fd | 514 | { |
a2a316fd SH |
515 | .procname = "warnings", |
516 | .data = &net_msg_warn, | |
517 | .maxlen = sizeof(int), | |
518 | .mode = 0644, | |
6d9f239a | 519 | .proc_handler = proc_dointvec |
a2a316fd | 520 | }, |
5f74f82e HWR |
521 | { |
522 | .procname = "max_skb_frags", | |
523 | .data = &sysctl_max_skb_frags, | |
524 | .maxlen = sizeof(int), | |
525 | .mode = 0644, | |
526 | .proc_handler = proc_dointvec_minmax, | |
527 | .extra1 = &one, | |
528 | .extra2 = &max_skb_frags, | |
529 | }, | |
7acf8a1e MW |
530 | { |
531 | .procname = "netdev_budget_usecs", | |
532 | .data = &netdev_budget_usecs, | |
533 | .maxlen = sizeof(unsigned int), | |
534 | .mode = 0644, | |
535 | .proc_handler = proc_dointvec_minmax, | |
536 | .extra1 = &zero, | |
537 | }, | |
79134e6c ED |
538 | { |
539 | .procname = "fb_tunnels_only_for_init_net", | |
540 | .data = &sysctl_fb_tunnels_only_for_init_net, | |
541 | .maxlen = sizeof(int), | |
542 | .mode = 0644, | |
543 | .proc_handler = proc_dointvec_minmax, | |
544 | .extra1 = &zero, | |
545 | .extra2 = &one, | |
546 | }, | |
f8572d8f | 547 | { } |
1da177e4 | 548 | }; |
33eb9cfc | 549 | |
d5a4502e PE |
550 | static struct ctl_table netns_core_table[] = { |
551 | { | |
d5a4502e PE |
552 | .procname = "somaxconn", |
553 | .data = &init_net.core.sysctl_somaxconn, | |
554 | .maxlen = sizeof(int), | |
555 | .mode = 0644, | |
5f671d6b | 556 | .extra1 = &zero, |
5f671d6b | 557 | .proc_handler = proc_dointvec_minmax |
d5a4502e | 558 | }, |
f8572d8f | 559 | { } |
d5a4502e PE |
560 | }; |
561 | ||
024626e3 | 562 | static __net_init int sysctl_core_net_init(struct net *net) |
33eb9cfc | 563 | { |
d5a4502e | 564 | struct ctl_table *tbl; |
024626e3 | 565 | |
d5a4502e | 566 | tbl = netns_core_table; |
09ad9bc7 | 567 | if (!net_eq(net, &init_net)) { |
d5a4502e | 568 | tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); |
024626e3 PE |
569 | if (tbl == NULL) |
570 | goto err_dup; | |
571 | ||
d5a4502e | 572 | tbl[0].data = &net->core.sysctl_somaxconn; |
464dc801 EB |
573 | |
574 | /* Don't export any sysctls to unprivileged users */ | |
575 | if (net->user_ns != &init_user_ns) { | |
576 | tbl[0].procname = NULL; | |
577 | } | |
024626e3 PE |
578 | } |
579 | ||
ec8f23ce | 580 | net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl); |
8efa6e93 | 581 | if (net->core.sysctl_hdr == NULL) |
024626e3 | 582 | goto err_reg; |
33eb9cfc | 583 | |
024626e3 PE |
584 | return 0; |
585 | ||
586 | err_reg: | |
d5a4502e | 587 | if (tbl != netns_core_table) |
024626e3 PE |
588 | kfree(tbl); |
589 | err_dup: | |
590 | return -ENOMEM; | |
591 | } | |
592 | ||
593 | static __net_exit void sysctl_core_net_exit(struct net *net) | |
594 | { | |
595 | struct ctl_table *tbl; | |
596 | ||
8efa6e93 PE |
597 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
598 | unregister_net_sysctl_table(net->core.sysctl_hdr); | |
d5a4502e | 599 | BUG_ON(tbl == netns_core_table); |
024626e3 PE |
600 | kfree(tbl); |
601 | } | |
602 | ||
603 | static __net_initdata struct pernet_operations sysctl_core_ops = { | |
604 | .init = sysctl_core_net_init, | |
605 | .exit = sysctl_core_net_exit, | |
606 | }; | |
607 | ||
608 | static __init int sysctl_core_init(void) | |
609 | { | |
43444757 | 610 | register_net_sysctl(&init_net, "net/core", net_core_table); |
024626e3 | 611 | return register_pernet_subsys(&sysctl_core_ops); |
33eb9cfc PE |
612 | } |
613 | ||
b27aeadb | 614 | fs_initcall(sysctl_core_init); |