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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> |
1da177e4 | 22 | |
cdda8891 | 23 | static int one = 1; |
24 | ||
fec5e652 TH |
25 | #ifdef CONFIG_RPS |
26 | static int rps_sock_flow_sysctl(ctl_table *table, int write, | |
27 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
28 | { | |
29 | unsigned int orig_size, size; | |
30 | int ret, i; | |
31 | ctl_table tmp = { | |
32 | .data = &size, | |
33 | .maxlen = sizeof(size), | |
34 | .mode = table->mode | |
35 | }; | |
36 | struct rps_sock_flow_table *orig_sock_table, *sock_table; | |
37 | static DEFINE_MUTEX(sock_flow_mutex); | |
38 | ||
39 | mutex_lock(&sock_flow_mutex); | |
40 | ||
6e3f7faf ED |
41 | orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, |
42 | lockdep_is_held(&sock_flow_mutex)); | |
fec5e652 TH |
43 | size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0; |
44 | ||
45 | ret = proc_dointvec(&tmp, write, buffer, lenp, ppos); | |
46 | ||
47 | if (write) { | |
48 | if (size) { | |
49 | if (size > 1<<30) { | |
50 | /* Enforce limit to prevent overflow */ | |
51 | mutex_unlock(&sock_flow_mutex); | |
52 | return -EINVAL; | |
53 | } | |
54 | size = roundup_pow_of_two(size); | |
55 | if (size != orig_size) { | |
56 | sock_table = | |
57 | vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size)); | |
58 | if (!sock_table) { | |
59 | mutex_unlock(&sock_flow_mutex); | |
60 | return -ENOMEM; | |
61 | } | |
62 | ||
63 | sock_table->mask = size - 1; | |
64 | } else | |
65 | sock_table = orig_sock_table; | |
66 | ||
67 | for (i = 0; i < size; i++) | |
68 | sock_table->ents[i] = RPS_NO_CPU; | |
69 | } else | |
70 | sock_table = NULL; | |
71 | ||
72 | if (sock_table != orig_sock_table) { | |
73 | rcu_assign_pointer(rps_sock_flow_table, sock_table); | |
adc9300e | 74 | if (sock_table) |
c5905afb | 75 | static_key_slow_inc(&rps_needed); |
adc9300e | 76 | if (orig_sock_table) { |
c5905afb | 77 | static_key_slow_dec(&rps_needed); |
adc9300e ED |
78 | synchronize_rcu(); |
79 | vfree(orig_sock_table); | |
80 | } | |
fec5e652 TH |
81 | } |
82 | } | |
83 | ||
84 | mutex_unlock(&sock_flow_mutex); | |
85 | ||
86 | return ret; | |
87 | } | |
88 | #endif /* CONFIG_RPS */ | |
89 | ||
99bbc707 WB |
90 | #ifdef CONFIG_NET_FLOW_LIMIT |
91 | static DEFINE_MUTEX(flow_limit_update_mutex); | |
92 | ||
93 | static int flow_limit_cpu_sysctl(ctl_table *table, int write, | |
94 | void __user *buffer, size_t *lenp, | |
95 | loff_t *ppos) | |
96 | { | |
97 | struct sd_flow_limit *cur; | |
98 | struct softnet_data *sd; | |
99 | cpumask_var_t mask; | |
100 | int i, len, ret = 0; | |
101 | ||
102 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) | |
103 | return -ENOMEM; | |
104 | ||
105 | if (write) { | |
106 | ret = cpumask_parse_user(buffer, *lenp, mask); | |
107 | if (ret) | |
108 | goto done; | |
109 | ||
110 | mutex_lock(&flow_limit_update_mutex); | |
111 | len = sizeof(*cur) + netdev_flow_limit_table_len; | |
112 | for_each_possible_cpu(i) { | |
113 | sd = &per_cpu(softnet_data, i); | |
114 | cur = rcu_dereference_protected(sd->flow_limit, | |
115 | lockdep_is_held(&flow_limit_update_mutex)); | |
116 | if (cur && !cpumask_test_cpu(i, mask)) { | |
117 | RCU_INIT_POINTER(sd->flow_limit, NULL); | |
118 | synchronize_rcu(); | |
119 | kfree(cur); | |
120 | } else if (!cur && cpumask_test_cpu(i, mask)) { | |
121 | cur = kzalloc(len, GFP_KERNEL); | |
122 | if (!cur) { | |
123 | /* not unwinding previous changes */ | |
124 | ret = -ENOMEM; | |
125 | goto write_unlock; | |
126 | } | |
127 | cur->num_buckets = netdev_flow_limit_table_len; | |
128 | rcu_assign_pointer(sd->flow_limit, cur); | |
129 | } | |
130 | } | |
131 | write_unlock: | |
132 | mutex_unlock(&flow_limit_update_mutex); | |
133 | } else { | |
134 | if (*ppos || !*lenp) { | |
135 | *lenp = 0; | |
136 | goto done; | |
137 | } | |
138 | ||
139 | cpumask_clear(mask); | |
140 | rcu_read_lock(); | |
141 | for_each_possible_cpu(i) { | |
142 | sd = &per_cpu(softnet_data, i); | |
143 | if (rcu_dereference(sd->flow_limit)) | |
144 | cpumask_set_cpu(i, mask); | |
145 | } | |
146 | rcu_read_unlock(); | |
147 | ||
148 | len = cpumask_scnprintf(buffer, *lenp, mask); | |
149 | *lenp = len + 1; | |
150 | *ppos += len + 1; | |
151 | } | |
152 | ||
153 | done: | |
154 | free_cpumask_var(mask); | |
155 | return ret; | |
156 | } | |
157 | ||
158 | static int flow_limit_table_len_sysctl(ctl_table *table, int write, | |
159 | void __user *buffer, size_t *lenp, | |
160 | loff_t *ppos) | |
161 | { | |
162 | unsigned int old, *ptr; | |
163 | int ret; | |
164 | ||
165 | mutex_lock(&flow_limit_update_mutex); | |
166 | ||
167 | ptr = table->data; | |
168 | old = *ptr; | |
169 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
170 | if (!ret && write && !is_power_of_2(*ptr)) { | |
171 | *ptr = old; | |
172 | ret = -EINVAL; | |
173 | } | |
174 | ||
175 | mutex_unlock(&flow_limit_update_mutex); | |
176 | return ret; | |
177 | } | |
178 | #endif /* CONFIG_NET_FLOW_LIMIT */ | |
179 | ||
33eb9cfc | 180 | static struct ctl_table net_core_table[] = { |
1da177e4 LT |
181 | #ifdef CONFIG_NET |
182 | { | |
1da177e4 LT |
183 | .procname = "wmem_max", |
184 | .data = &sysctl_wmem_max, | |
185 | .maxlen = sizeof(int), | |
186 | .mode = 0644, | |
cdda8891 | 187 | .proc_handler = proc_dointvec_minmax, |
188 | .extra1 = &one, | |
1da177e4 LT |
189 | }, |
190 | { | |
1da177e4 LT |
191 | .procname = "rmem_max", |
192 | .data = &sysctl_rmem_max, | |
193 | .maxlen = sizeof(int), | |
194 | .mode = 0644, | |
cdda8891 | 195 | .proc_handler = proc_dointvec_minmax, |
196 | .extra1 = &one, | |
1da177e4 LT |
197 | }, |
198 | { | |
1da177e4 LT |
199 | .procname = "wmem_default", |
200 | .data = &sysctl_wmem_default, | |
201 | .maxlen = sizeof(int), | |
202 | .mode = 0644, | |
cdda8891 | 203 | .proc_handler = proc_dointvec_minmax, |
204 | .extra1 = &one, | |
1da177e4 LT |
205 | }, |
206 | { | |
1da177e4 LT |
207 | .procname = "rmem_default", |
208 | .data = &sysctl_rmem_default, | |
209 | .maxlen = sizeof(int), | |
210 | .mode = 0644, | |
cdda8891 | 211 | .proc_handler = proc_dointvec_minmax, |
212 | .extra1 = &one, | |
1da177e4 LT |
213 | }, |
214 | { | |
1da177e4 LT |
215 | .procname = "dev_weight", |
216 | .data = &weight_p, | |
217 | .maxlen = sizeof(int), | |
218 | .mode = 0644, | |
6d9f239a | 219 | .proc_handler = proc_dointvec |
1da177e4 LT |
220 | }, |
221 | { | |
1da177e4 LT |
222 | .procname = "netdev_max_backlog", |
223 | .data = &netdev_max_backlog, | |
224 | .maxlen = sizeof(int), | |
225 | .mode = 0644, | |
6d9f239a | 226 | .proc_handler = proc_dointvec |
1da177e4 | 227 | }, |
0a14842f ED |
228 | #ifdef CONFIG_BPF_JIT |
229 | { | |
230 | .procname = "bpf_jit_enable", | |
231 | .data = &bpf_jit_enable, | |
232 | .maxlen = sizeof(int), | |
233 | .mode = 0644, | |
234 | .proc_handler = proc_dointvec | |
235 | }, | |
236 | #endif | |
3b098e2d ED |
237 | { |
238 | .procname = "netdev_tstamp_prequeue", | |
239 | .data = &netdev_tstamp_prequeue, | |
240 | .maxlen = sizeof(int), | |
241 | .mode = 0644, | |
242 | .proc_handler = proc_dointvec | |
243 | }, | |
1da177e4 | 244 | { |
1da177e4 | 245 | .procname = "message_cost", |
717115e1 | 246 | .data = &net_ratelimit_state.interval, |
1da177e4 LT |
247 | .maxlen = sizeof(int), |
248 | .mode = 0644, | |
6d9f239a | 249 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
250 | }, |
251 | { | |
1da177e4 | 252 | .procname = "message_burst", |
717115e1 | 253 | .data = &net_ratelimit_state.burst, |
1da177e4 LT |
254 | .maxlen = sizeof(int), |
255 | .mode = 0644, | |
6d9f239a | 256 | .proc_handler = proc_dointvec, |
1da177e4 LT |
257 | }, |
258 | { | |
1da177e4 LT |
259 | .procname = "optmem_max", |
260 | .data = &sysctl_optmem_max, | |
261 | .maxlen = sizeof(int), | |
262 | .mode = 0644, | |
6d9f239a | 263 | .proc_handler = proc_dointvec |
1da177e4 | 264 | }, |
fec5e652 TH |
265 | #ifdef CONFIG_RPS |
266 | { | |
267 | .procname = "rps_sock_flow_entries", | |
268 | .maxlen = sizeof(int), | |
269 | .mode = 0644, | |
270 | .proc_handler = rps_sock_flow_sysctl | |
271 | }, | |
272 | #endif | |
99bbc707 WB |
273 | #ifdef CONFIG_NET_FLOW_LIMIT |
274 | { | |
275 | .procname = "flow_limit_cpu_bitmap", | |
276 | .mode = 0644, | |
277 | .proc_handler = flow_limit_cpu_sysctl | |
278 | }, | |
279 | { | |
280 | .procname = "flow_limit_table_len", | |
281 | .data = &netdev_flow_limit_table_len, | |
282 | .maxlen = sizeof(int), | |
283 | .mode = 0644, | |
284 | .proc_handler = flow_limit_table_len_sysctl | |
285 | }, | |
286 | #endif /* CONFIG_NET_FLOW_LIMIT */ | |
1da177e4 | 287 | #endif /* CONFIG_NET */ |
51b0bded | 288 | { |
51b0bded SH |
289 | .procname = "netdev_budget", |
290 | .data = &netdev_budget, | |
291 | .maxlen = sizeof(int), | |
292 | .mode = 0644, | |
6d9f239a | 293 | .proc_handler = proc_dointvec |
51b0bded | 294 | }, |
a2a316fd | 295 | { |
a2a316fd SH |
296 | .procname = "warnings", |
297 | .data = &net_msg_warn, | |
298 | .maxlen = sizeof(int), | |
299 | .mode = 0644, | |
6d9f239a | 300 | .proc_handler = proc_dointvec |
a2a316fd | 301 | }, |
f8572d8f | 302 | { } |
1da177e4 | 303 | }; |
33eb9cfc | 304 | |
d5a4502e PE |
305 | static struct ctl_table netns_core_table[] = { |
306 | { | |
d5a4502e PE |
307 | .procname = "somaxconn", |
308 | .data = &init_net.core.sysctl_somaxconn, | |
309 | .maxlen = sizeof(int), | |
310 | .mode = 0644, | |
6d9f239a | 311 | .proc_handler = proc_dointvec |
d5a4502e | 312 | }, |
f8572d8f | 313 | { } |
d5a4502e PE |
314 | }; |
315 | ||
024626e3 | 316 | static __net_init int sysctl_core_net_init(struct net *net) |
33eb9cfc | 317 | { |
d5a4502e | 318 | struct ctl_table *tbl; |
024626e3 | 319 | |
8efa6e93 | 320 | net->core.sysctl_somaxconn = SOMAXCONN; |
b8e1f9b5 | 321 | |
d5a4502e | 322 | tbl = netns_core_table; |
09ad9bc7 | 323 | if (!net_eq(net, &init_net)) { |
d5a4502e | 324 | tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); |
024626e3 PE |
325 | if (tbl == NULL) |
326 | goto err_dup; | |
327 | ||
d5a4502e | 328 | tbl[0].data = &net->core.sysctl_somaxconn; |
464dc801 EB |
329 | |
330 | /* Don't export any sysctls to unprivileged users */ | |
331 | if (net->user_ns != &init_user_ns) { | |
332 | tbl[0].procname = NULL; | |
333 | } | |
024626e3 PE |
334 | } |
335 | ||
ec8f23ce | 336 | net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl); |
8efa6e93 | 337 | if (net->core.sysctl_hdr == NULL) |
024626e3 | 338 | goto err_reg; |
33eb9cfc | 339 | |
024626e3 PE |
340 | return 0; |
341 | ||
342 | err_reg: | |
d5a4502e | 343 | if (tbl != netns_core_table) |
024626e3 PE |
344 | kfree(tbl); |
345 | err_dup: | |
346 | return -ENOMEM; | |
347 | } | |
348 | ||
349 | static __net_exit void sysctl_core_net_exit(struct net *net) | |
350 | { | |
351 | struct ctl_table *tbl; | |
352 | ||
8efa6e93 PE |
353 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
354 | unregister_net_sysctl_table(net->core.sysctl_hdr); | |
d5a4502e | 355 | BUG_ON(tbl == netns_core_table); |
024626e3 PE |
356 | kfree(tbl); |
357 | } | |
358 | ||
359 | static __net_initdata struct pernet_operations sysctl_core_ops = { | |
360 | .init = sysctl_core_net_init, | |
361 | .exit = sysctl_core_net_exit, | |
362 | }; | |
363 | ||
364 | static __init int sysctl_core_init(void) | |
365 | { | |
43444757 | 366 | register_net_sysctl(&init_net, "net/core", net_core_table); |
024626e3 | 367 | return register_pernet_subsys(&sysctl_core_ops); |
33eb9cfc PE |
368 | } |
369 | ||
b27aeadb | 370 | fs_initcall(sysctl_core_init); |