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; |
b1cb59cf AK |
27 | static int min_sndbuf = SOCK_MIN_SNDBUF; |
28 | static int min_rcvbuf = SOCK_MIN_RCVBUF; | |
5f74f82e | 29 | static int max_skb_frags = MAX_SKB_FRAGS; |
cdda8891 | 30 | |
ba7a46f1 JP |
31 | static int net_msg_warn; /* Unused, but still a sysctl */ |
32 | ||
fec5e652 | 33 | #ifdef CONFIG_RPS |
fe2c6338 | 34 | static int rps_sock_flow_sysctl(struct ctl_table *table, int write, |
fec5e652 TH |
35 | void __user *buffer, size_t *lenp, loff_t *ppos) |
36 | { | |
37 | unsigned int orig_size, size; | |
38 | int ret, i; | |
fe2c6338 | 39 | struct ctl_table tmp = { |
fec5e652 TH |
40 | .data = &size, |
41 | .maxlen = sizeof(size), | |
42 | .mode = table->mode | |
43 | }; | |
44 | struct rps_sock_flow_table *orig_sock_table, *sock_table; | |
45 | static DEFINE_MUTEX(sock_flow_mutex); | |
46 | ||
47 | mutex_lock(&sock_flow_mutex); | |
48 | ||
6e3f7faf ED |
49 | orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, |
50 | lockdep_is_held(&sock_flow_mutex)); | |
fec5e652 TH |
51 | size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0; |
52 | ||
53 | ret = proc_dointvec(&tmp, write, buffer, lenp, ppos); | |
54 | ||
55 | if (write) { | |
56 | if (size) { | |
93c1af6c | 57 | if (size > 1<<29) { |
fec5e652 TH |
58 | /* Enforce limit to prevent overflow */ |
59 | mutex_unlock(&sock_flow_mutex); | |
60 | return -EINVAL; | |
61 | } | |
62 | size = roundup_pow_of_two(size); | |
63 | if (size != orig_size) { | |
64 | sock_table = | |
65 | vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size)); | |
66 | if (!sock_table) { | |
67 | mutex_unlock(&sock_flow_mutex); | |
68 | return -ENOMEM; | |
69 | } | |
567e4b79 | 70 | rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1; |
fec5e652 TH |
71 | sock_table->mask = size - 1; |
72 | } else | |
73 | sock_table = orig_sock_table; | |
74 | ||
75 | for (i = 0; i < size; i++) | |
76 | sock_table->ents[i] = RPS_NO_CPU; | |
77 | } else | |
78 | sock_table = NULL; | |
79 | ||
80 | if (sock_table != orig_sock_table) { | |
81 | rcu_assign_pointer(rps_sock_flow_table, sock_table); | |
13bfff25 | 82 | if (sock_table) { |
c5905afb | 83 | static_key_slow_inc(&rps_needed); |
13bfff25 ED |
84 | static_key_slow_inc(&rfs_needed); |
85 | } | |
adc9300e | 86 | if (orig_sock_table) { |
c5905afb | 87 | static_key_slow_dec(&rps_needed); |
13bfff25 | 88 | static_key_slow_dec(&rfs_needed); |
adc9300e ED |
89 | synchronize_rcu(); |
90 | vfree(orig_sock_table); | |
91 | } | |
fec5e652 TH |
92 | } |
93 | } | |
94 | ||
95 | mutex_unlock(&sock_flow_mutex); | |
96 | ||
97 | return ret; | |
98 | } | |
99 | #endif /* CONFIG_RPS */ | |
100 | ||
99bbc707 WB |
101 | #ifdef CONFIG_NET_FLOW_LIMIT |
102 | static DEFINE_MUTEX(flow_limit_update_mutex); | |
103 | ||
fe2c6338 | 104 | static int flow_limit_cpu_sysctl(struct ctl_table *table, int write, |
99bbc707 WB |
105 | void __user *buffer, size_t *lenp, |
106 | loff_t *ppos) | |
107 | { | |
108 | struct sd_flow_limit *cur; | |
109 | struct softnet_data *sd; | |
110 | cpumask_var_t mask; | |
111 | int i, len, ret = 0; | |
112 | ||
113 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) | |
114 | return -ENOMEM; | |
115 | ||
116 | if (write) { | |
117 | ret = cpumask_parse_user(buffer, *lenp, mask); | |
118 | if (ret) | |
119 | goto done; | |
120 | ||
121 | mutex_lock(&flow_limit_update_mutex); | |
122 | len = sizeof(*cur) + netdev_flow_limit_table_len; | |
123 | for_each_possible_cpu(i) { | |
124 | sd = &per_cpu(softnet_data, i); | |
125 | cur = rcu_dereference_protected(sd->flow_limit, | |
126 | lockdep_is_held(&flow_limit_update_mutex)); | |
127 | if (cur && !cpumask_test_cpu(i, mask)) { | |
128 | RCU_INIT_POINTER(sd->flow_limit, NULL); | |
129 | synchronize_rcu(); | |
130 | kfree(cur); | |
131 | } else if (!cur && cpumask_test_cpu(i, mask)) { | |
5b59d467 ED |
132 | cur = kzalloc_node(len, GFP_KERNEL, |
133 | cpu_to_node(i)); | |
99bbc707 WB |
134 | if (!cur) { |
135 | /* not unwinding previous changes */ | |
136 | ret = -ENOMEM; | |
137 | goto write_unlock; | |
138 | } | |
139 | cur->num_buckets = netdev_flow_limit_table_len; | |
140 | rcu_assign_pointer(sd->flow_limit, cur); | |
141 | } | |
142 | } | |
143 | write_unlock: | |
144 | mutex_unlock(&flow_limit_update_mutex); | |
145 | } else { | |
5f121b9a WB |
146 | char kbuf[128]; |
147 | ||
99bbc707 WB |
148 | if (*ppos || !*lenp) { |
149 | *lenp = 0; | |
150 | goto done; | |
151 | } | |
152 | ||
153 | cpumask_clear(mask); | |
154 | rcu_read_lock(); | |
155 | for_each_possible_cpu(i) { | |
156 | sd = &per_cpu(softnet_data, i); | |
157 | if (rcu_dereference(sd->flow_limit)) | |
158 | cpumask_set_cpu(i, mask); | |
159 | } | |
160 | rcu_read_unlock(); | |
161 | ||
5f121b9a | 162 | len = min(sizeof(kbuf) - 1, *lenp); |
f0906827 | 163 | len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask)); |
5f121b9a WB |
164 | if (!len) { |
165 | *lenp = 0; | |
166 | goto done; | |
167 | } | |
168 | if (len < *lenp) | |
169 | kbuf[len++] = '\n'; | |
170 | if (copy_to_user(buffer, kbuf, len)) { | |
171 | ret = -EFAULT; | |
172 | goto done; | |
173 | } | |
174 | *lenp = len; | |
175 | *ppos += len; | |
99bbc707 WB |
176 | } |
177 | ||
178 | done: | |
179 | free_cpumask_var(mask); | |
180 | return ret; | |
181 | } | |
182 | ||
fe2c6338 | 183 | static int flow_limit_table_len_sysctl(struct ctl_table *table, int write, |
99bbc707 WB |
184 | void __user *buffer, size_t *lenp, |
185 | loff_t *ppos) | |
186 | { | |
187 | unsigned int old, *ptr; | |
188 | int ret; | |
189 | ||
190 | mutex_lock(&flow_limit_update_mutex); | |
191 | ||
192 | ptr = table->data; | |
193 | old = *ptr; | |
194 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
195 | if (!ret && write && !is_power_of_2(*ptr)) { | |
196 | *ptr = old; | |
197 | ret = -EINVAL; | |
198 | } | |
199 | ||
200 | mutex_unlock(&flow_limit_update_mutex); | |
201 | return ret; | |
202 | } | |
203 | #endif /* CONFIG_NET_FLOW_LIMIT */ | |
204 | ||
6da7c8fc | 205 | #ifdef CONFIG_NET_SCHED |
206 | static int set_default_qdisc(struct ctl_table *table, int write, | |
207 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
208 | { | |
209 | char id[IFNAMSIZ]; | |
210 | struct ctl_table tbl = { | |
211 | .data = id, | |
212 | .maxlen = IFNAMSIZ, | |
213 | }; | |
214 | int ret; | |
215 | ||
216 | qdisc_get_default(id, IFNAMSIZ); | |
217 | ||
218 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); | |
219 | if (write && ret == 0) | |
220 | ret = qdisc_set_default(id); | |
221 | return ret; | |
222 | } | |
223 | #endif | |
224 | ||
960fb622 ED |
225 | static int proc_do_rss_key(struct ctl_table *table, int write, |
226 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
227 | { | |
228 | struct ctl_table fake_table; | |
229 | char buf[NETDEV_RSS_KEY_LEN * 3]; | |
230 | ||
231 | snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key); | |
232 | fake_table.data = buf; | |
233 | fake_table.maxlen = sizeof(buf); | |
234 | return proc_dostring(&fake_table, write, buffer, lenp, ppos); | |
235 | } | |
236 | ||
33eb9cfc | 237 | static struct ctl_table net_core_table[] = { |
1da177e4 LT |
238 | #ifdef CONFIG_NET |
239 | { | |
1da177e4 LT |
240 | .procname = "wmem_max", |
241 | .data = &sysctl_wmem_max, | |
242 | .maxlen = sizeof(int), | |
243 | .mode = 0644, | |
cdda8891 | 244 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 245 | .extra1 = &min_sndbuf, |
1da177e4 LT |
246 | }, |
247 | { | |
1da177e4 LT |
248 | .procname = "rmem_max", |
249 | .data = &sysctl_rmem_max, | |
250 | .maxlen = sizeof(int), | |
251 | .mode = 0644, | |
cdda8891 | 252 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 253 | .extra1 = &min_rcvbuf, |
1da177e4 LT |
254 | }, |
255 | { | |
1da177e4 LT |
256 | .procname = "wmem_default", |
257 | .data = &sysctl_wmem_default, | |
258 | .maxlen = sizeof(int), | |
259 | .mode = 0644, | |
cdda8891 | 260 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 261 | .extra1 = &min_sndbuf, |
1da177e4 LT |
262 | }, |
263 | { | |
1da177e4 LT |
264 | .procname = "rmem_default", |
265 | .data = &sysctl_rmem_default, | |
266 | .maxlen = sizeof(int), | |
267 | .mode = 0644, | |
cdda8891 | 268 | .proc_handler = proc_dointvec_minmax, |
b1cb59cf | 269 | .extra1 = &min_rcvbuf, |
1da177e4 LT |
270 | }, |
271 | { | |
1da177e4 LT |
272 | .procname = "dev_weight", |
273 | .data = &weight_p, | |
274 | .maxlen = sizeof(int), | |
275 | .mode = 0644, | |
6d9f239a | 276 | .proc_handler = proc_dointvec |
1da177e4 LT |
277 | }, |
278 | { | |
1da177e4 LT |
279 | .procname = "netdev_max_backlog", |
280 | .data = &netdev_max_backlog, | |
281 | .maxlen = sizeof(int), | |
282 | .mode = 0644, | |
6d9f239a | 283 | .proc_handler = proc_dointvec |
1da177e4 | 284 | }, |
960fb622 ED |
285 | { |
286 | .procname = "netdev_rss_key", | |
287 | .data = &netdev_rss_key, | |
288 | .maxlen = sizeof(int), | |
289 | .mode = 0444, | |
290 | .proc_handler = proc_do_rss_key, | |
291 | }, | |
0a14842f ED |
292 | #ifdef CONFIG_BPF_JIT |
293 | { | |
294 | .procname = "bpf_jit_enable", | |
295 | .data = &bpf_jit_enable, | |
296 | .maxlen = sizeof(int), | |
297 | .mode = 0644, | |
298 | .proc_handler = proc_dointvec | |
299 | }, | |
4f3446bb DB |
300 | # ifdef CONFIG_HAVE_EBPF_JIT |
301 | { | |
302 | .procname = "bpf_jit_harden", | |
303 | .data = &bpf_jit_harden, | |
304 | .maxlen = sizeof(int), | |
305 | .mode = 0600, | |
306 | .proc_handler = proc_dointvec, | |
307 | }, | |
308 | # endif | |
0a14842f | 309 | #endif |
3b098e2d ED |
310 | { |
311 | .procname = "netdev_tstamp_prequeue", | |
312 | .data = &netdev_tstamp_prequeue, | |
313 | .maxlen = sizeof(int), | |
314 | .mode = 0644, | |
315 | .proc_handler = proc_dointvec | |
316 | }, | |
1da177e4 | 317 | { |
1da177e4 | 318 | .procname = "message_cost", |
717115e1 | 319 | .data = &net_ratelimit_state.interval, |
1da177e4 LT |
320 | .maxlen = sizeof(int), |
321 | .mode = 0644, | |
6d9f239a | 322 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
323 | }, |
324 | { | |
1da177e4 | 325 | .procname = "message_burst", |
717115e1 | 326 | .data = &net_ratelimit_state.burst, |
1da177e4 LT |
327 | .maxlen = sizeof(int), |
328 | .mode = 0644, | |
6d9f239a | 329 | .proc_handler = proc_dointvec, |
1da177e4 LT |
330 | }, |
331 | { | |
1da177e4 LT |
332 | .procname = "optmem_max", |
333 | .data = &sysctl_optmem_max, | |
334 | .maxlen = sizeof(int), | |
335 | .mode = 0644, | |
6d9f239a | 336 | .proc_handler = proc_dointvec |
1da177e4 | 337 | }, |
b245be1f WB |
338 | { |
339 | .procname = "tstamp_allow_data", | |
340 | .data = &sysctl_tstamp_allow_data, | |
341 | .maxlen = sizeof(int), | |
342 | .mode = 0644, | |
343 | .proc_handler = proc_dointvec_minmax, | |
344 | .extra1 = &zero, | |
345 | .extra2 = &one | |
346 | }, | |
fec5e652 TH |
347 | #ifdef CONFIG_RPS |
348 | { | |
349 | .procname = "rps_sock_flow_entries", | |
350 | .maxlen = sizeof(int), | |
351 | .mode = 0644, | |
352 | .proc_handler = rps_sock_flow_sysctl | |
353 | }, | |
354 | #endif | |
99bbc707 WB |
355 | #ifdef CONFIG_NET_FLOW_LIMIT |
356 | { | |
357 | .procname = "flow_limit_cpu_bitmap", | |
358 | .mode = 0644, | |
359 | .proc_handler = flow_limit_cpu_sysctl | |
360 | }, | |
361 | { | |
362 | .procname = "flow_limit_table_len", | |
363 | .data = &netdev_flow_limit_table_len, | |
364 | .maxlen = sizeof(int), | |
365 | .mode = 0644, | |
366 | .proc_handler = flow_limit_table_len_sysctl | |
367 | }, | |
368 | #endif /* CONFIG_NET_FLOW_LIMIT */ | |
e0d1095a | 369 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 370 | { |
64b0dc51 ET |
371 | .procname = "busy_poll", |
372 | .data = &sysctl_net_busy_poll, | |
eb6db622 | 373 | .maxlen = sizeof(unsigned int), |
06021292 | 374 | .mode = 0644, |
eb6db622 | 375 | .proc_handler = proc_dointvec |
06021292 | 376 | }, |
2d48d67f | 377 | { |
64b0dc51 ET |
378 | .procname = "busy_read", |
379 | .data = &sysctl_net_busy_read, | |
2d48d67f ET |
380 | .maxlen = sizeof(unsigned int), |
381 | .mode = 0644, | |
382 | .proc_handler = proc_dointvec | |
383 | }, | |
6da7c8fc | 384 | #endif |
385 | #ifdef CONFIG_NET_SCHED | |
386 | { | |
387 | .procname = "default_qdisc", | |
388 | .mode = 0644, | |
389 | .maxlen = IFNAMSIZ, | |
390 | .proc_handler = set_default_qdisc | |
391 | }, | |
06021292 | 392 | #endif |
1da177e4 | 393 | #endif /* CONFIG_NET */ |
51b0bded | 394 | { |
51b0bded SH |
395 | .procname = "netdev_budget", |
396 | .data = &netdev_budget, | |
397 | .maxlen = sizeof(int), | |
398 | .mode = 0644, | |
6d9f239a | 399 | .proc_handler = proc_dointvec |
51b0bded | 400 | }, |
a2a316fd | 401 | { |
a2a316fd SH |
402 | .procname = "warnings", |
403 | .data = &net_msg_warn, | |
404 | .maxlen = sizeof(int), | |
405 | .mode = 0644, | |
6d9f239a | 406 | .proc_handler = proc_dointvec |
a2a316fd | 407 | }, |
5f74f82e HWR |
408 | { |
409 | .procname = "max_skb_frags", | |
410 | .data = &sysctl_max_skb_frags, | |
411 | .maxlen = sizeof(int), | |
412 | .mode = 0644, | |
413 | .proc_handler = proc_dointvec_minmax, | |
414 | .extra1 = &one, | |
415 | .extra2 = &max_skb_frags, | |
416 | }, | |
f8572d8f | 417 | { } |
1da177e4 | 418 | }; |
33eb9cfc | 419 | |
d5a4502e PE |
420 | static struct ctl_table netns_core_table[] = { |
421 | { | |
d5a4502e PE |
422 | .procname = "somaxconn", |
423 | .data = &init_net.core.sysctl_somaxconn, | |
424 | .maxlen = sizeof(int), | |
425 | .mode = 0644, | |
5f671d6b | 426 | .extra1 = &zero, |
5f671d6b | 427 | .proc_handler = proc_dointvec_minmax |
d5a4502e | 428 | }, |
f8572d8f | 429 | { } |
d5a4502e PE |
430 | }; |
431 | ||
024626e3 | 432 | static __net_init int sysctl_core_net_init(struct net *net) |
33eb9cfc | 433 | { |
d5a4502e | 434 | struct ctl_table *tbl; |
024626e3 | 435 | |
8efa6e93 | 436 | net->core.sysctl_somaxconn = SOMAXCONN; |
b8e1f9b5 | 437 | |
d5a4502e | 438 | tbl = netns_core_table; |
09ad9bc7 | 439 | if (!net_eq(net, &init_net)) { |
d5a4502e | 440 | tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); |
024626e3 PE |
441 | if (tbl == NULL) |
442 | goto err_dup; | |
443 | ||
d5a4502e | 444 | tbl[0].data = &net->core.sysctl_somaxconn; |
464dc801 EB |
445 | |
446 | /* Don't export any sysctls to unprivileged users */ | |
447 | if (net->user_ns != &init_user_ns) { | |
448 | tbl[0].procname = NULL; | |
449 | } | |
024626e3 PE |
450 | } |
451 | ||
ec8f23ce | 452 | net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl); |
8efa6e93 | 453 | if (net->core.sysctl_hdr == NULL) |
024626e3 | 454 | goto err_reg; |
33eb9cfc | 455 | |
024626e3 PE |
456 | return 0; |
457 | ||
458 | err_reg: | |
d5a4502e | 459 | if (tbl != netns_core_table) |
024626e3 PE |
460 | kfree(tbl); |
461 | err_dup: | |
462 | return -ENOMEM; | |
463 | } | |
464 | ||
465 | static __net_exit void sysctl_core_net_exit(struct net *net) | |
466 | { | |
467 | struct ctl_table *tbl; | |
468 | ||
8efa6e93 PE |
469 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
470 | unregister_net_sysctl_table(net->core.sysctl_hdr); | |
d5a4502e | 471 | BUG_ON(tbl == netns_core_table); |
024626e3 PE |
472 | kfree(tbl); |
473 | } | |
474 | ||
475 | static __net_initdata struct pernet_operations sysctl_core_ops = { | |
476 | .init = sysctl_core_net_init, | |
477 | .exit = sysctl_core_net_exit, | |
478 | }; | |
479 | ||
480 | static __init int sysctl_core_init(void) | |
481 | { | |
43444757 | 482 | register_net_sysctl(&init_net, "net/core", net_core_table); |
024626e3 | 483 | return register_pernet_subsys(&sysctl_core_ops); |
33eb9cfc PE |
484 | } |
485 | ||
b27aeadb | 486 | fs_initcall(sysctl_core_init); |