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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>
10#include <linux/module.h>
11#include <linux/socket.h>
12#include <linux/netdevice.h>
13#include <linux/ratelimit.h>
14#include <linux/vmalloc.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <linux/kmemleak.h>
18
19#include <net/ip.h>
20#include <net/sock.h>
21#include <net/net_ratelimit.h>
22#include <net/busy_poll.h>
23#include <net/pkt_sched.h>
24
25static int zero = 0;
26static int one = 1;
27static int ushort_max = USHRT_MAX;
28
29#ifdef CONFIG_RPS
30static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
31 void __user *buffer, size_t *lenp, loff_t *ppos)
32{
33 unsigned int orig_size, size;
34 int ret, i;
35 struct ctl_table tmp = {
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
45 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
46 lockdep_is_held(&sock_flow_mutex));
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);
78 if (sock_table)
79 static_key_slow_inc(&rps_needed);
80 if (orig_sock_table) {
81 static_key_slow_dec(&rps_needed);
82 synchronize_rcu();
83 vfree(orig_sock_table);
84 }
85 }
86 }
87
88 mutex_unlock(&sock_flow_mutex);
89
90 return ret;
91}
92#endif /* CONFIG_RPS */
93
94#ifdef CONFIG_NET_FLOW_LIMIT
95static DEFINE_MUTEX(flow_limit_update_mutex);
96
97static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
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_node(len, GFP_KERNEL,
126 cpu_to_node(i));
127 if (!cur) {
128 /* not unwinding previous changes */
129 ret = -ENOMEM;
130 goto write_unlock;
131 }
132 cur->num_buckets = netdev_flow_limit_table_len;
133 rcu_assign_pointer(sd->flow_limit, cur);
134 }
135 }
136write_unlock:
137 mutex_unlock(&flow_limit_update_mutex);
138 } else {
139 char kbuf[128];
140
141 if (*ppos || !*lenp) {
142 *lenp = 0;
143 goto done;
144 }
145
146 cpumask_clear(mask);
147 rcu_read_lock();
148 for_each_possible_cpu(i) {
149 sd = &per_cpu(softnet_data, i);
150 if (rcu_dereference(sd->flow_limit))
151 cpumask_set_cpu(i, mask);
152 }
153 rcu_read_unlock();
154
155 len = min(sizeof(kbuf) - 1, *lenp);
156 len = cpumask_scnprintf(kbuf, len, mask);
157 if (!len) {
158 *lenp = 0;
159 goto done;
160 }
161 if (len < *lenp)
162 kbuf[len++] = '\n';
163 if (copy_to_user(buffer, kbuf, len)) {
164 ret = -EFAULT;
165 goto done;
166 }
167 *lenp = len;
168 *ppos += len;
169 }
170
171done:
172 free_cpumask_var(mask);
173 return ret;
174}
175
176static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
177 void __user *buffer, size_t *lenp,
178 loff_t *ppos)
179{
180 unsigned int old, *ptr;
181 int ret;
182
183 mutex_lock(&flow_limit_update_mutex);
184
185 ptr = table->data;
186 old = *ptr;
187 ret = proc_dointvec(table, write, buffer, lenp, ppos);
188 if (!ret && write && !is_power_of_2(*ptr)) {
189 *ptr = old;
190 ret = -EINVAL;
191 }
192
193 mutex_unlock(&flow_limit_update_mutex);
194 return ret;
195}
196#endif /* CONFIG_NET_FLOW_LIMIT */
197
198#ifdef CONFIG_NET_SCHED
199static int set_default_qdisc(struct ctl_table *table, int write,
200 void __user *buffer, size_t *lenp, loff_t *ppos)
201{
202 char id[IFNAMSIZ];
203 struct ctl_table tbl = {
204 .data = id,
205 .maxlen = IFNAMSIZ,
206 };
207 int ret;
208
209 qdisc_get_default(id, IFNAMSIZ);
210
211 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
212 if (write && ret == 0)
213 ret = qdisc_set_default(id);
214 return ret;
215}
216#endif
217
218static struct ctl_table net_core_table[] = {
219#ifdef CONFIG_NET
220 {
221 .procname = "wmem_max",
222 .data = &sysctl_wmem_max,
223 .maxlen = sizeof(int),
224 .mode = 0644,
225 .proc_handler = proc_dointvec_minmax,
226 .extra1 = &one,
227 },
228 {
229 .procname = "rmem_max",
230 .data = &sysctl_rmem_max,
231 .maxlen = sizeof(int),
232 .mode = 0644,
233 .proc_handler = proc_dointvec_minmax,
234 .extra1 = &one,
235 },
236 {
237 .procname = "wmem_default",
238 .data = &sysctl_wmem_default,
239 .maxlen = sizeof(int),
240 .mode = 0644,
241 .proc_handler = proc_dointvec_minmax,
242 .extra1 = &one,
243 },
244 {
245 .procname = "rmem_default",
246 .data = &sysctl_rmem_default,
247 .maxlen = sizeof(int),
248 .mode = 0644,
249 .proc_handler = proc_dointvec_minmax,
250 .extra1 = &one,
251 },
252 {
253 .procname = "dev_weight",
254 .data = &weight_p,
255 .maxlen = sizeof(int),
256 .mode = 0644,
257 .proc_handler = proc_dointvec
258 },
259 {
260 .procname = "netdev_max_backlog",
261 .data = &netdev_max_backlog,
262 .maxlen = sizeof(int),
263 .mode = 0644,
264 .proc_handler = proc_dointvec
265 },
266#ifdef CONFIG_BPF_JIT
267 {
268 .procname = "bpf_jit_enable",
269 .data = &bpf_jit_enable,
270 .maxlen = sizeof(int),
271 .mode = 0644,
272 .proc_handler = proc_dointvec
273 },
274#endif
275 {
276 .procname = "netdev_tstamp_prequeue",
277 .data = &netdev_tstamp_prequeue,
278 .maxlen = sizeof(int),
279 .mode = 0644,
280 .proc_handler = proc_dointvec
281 },
282 {
283 .procname = "message_cost",
284 .data = &net_ratelimit_state.interval,
285 .maxlen = sizeof(int),
286 .mode = 0644,
287 .proc_handler = proc_dointvec_jiffies,
288 },
289 {
290 .procname = "message_burst",
291 .data = &net_ratelimit_state.burst,
292 .maxlen = sizeof(int),
293 .mode = 0644,
294 .proc_handler = proc_dointvec,
295 },
296 {
297 .procname = "optmem_max",
298 .data = &sysctl_optmem_max,
299 .maxlen = sizeof(int),
300 .mode = 0644,
301 .proc_handler = proc_dointvec
302 },
303#ifdef CONFIG_RPS
304 {
305 .procname = "rps_sock_flow_entries",
306 .maxlen = sizeof(int),
307 .mode = 0644,
308 .proc_handler = rps_sock_flow_sysctl
309 },
310#endif
311#ifdef CONFIG_NET_FLOW_LIMIT
312 {
313 .procname = "flow_limit_cpu_bitmap",
314 .mode = 0644,
315 .proc_handler = flow_limit_cpu_sysctl
316 },
317 {
318 .procname = "flow_limit_table_len",
319 .data = &netdev_flow_limit_table_len,
320 .maxlen = sizeof(int),
321 .mode = 0644,
322 .proc_handler = flow_limit_table_len_sysctl
323 },
324#endif /* CONFIG_NET_FLOW_LIMIT */
325#ifdef CONFIG_NET_RX_BUSY_POLL
326 {
327 .procname = "busy_poll",
328 .data = &sysctl_net_busy_poll,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec
332 },
333 {
334 .procname = "busy_read",
335 .data = &sysctl_net_busy_read,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec
339 },
340#endif
341#ifdef CONFIG_NET_SCHED
342 {
343 .procname = "default_qdisc",
344 .mode = 0644,
345 .maxlen = IFNAMSIZ,
346 .proc_handler = set_default_qdisc
347 },
348#endif
349#endif /* CONFIG_NET */
350 {
351 .procname = "netdev_budget",
352 .data = &netdev_budget,
353 .maxlen = sizeof(int),
354 .mode = 0644,
355 .proc_handler = proc_dointvec
356 },
357 {
358 .procname = "warnings",
359 .data = &net_msg_warn,
360 .maxlen = sizeof(int),
361 .mode = 0644,
362 .proc_handler = proc_dointvec
363 },
364 { }
365};
366
367static struct ctl_table netns_core_table[] = {
368 {
369 .procname = "somaxconn",
370 .data = &init_net.core.sysctl_somaxconn,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .extra1 = &zero,
374 .extra2 = &ushort_max,
375 .proc_handler = proc_dointvec_minmax
376 },
377 { }
378};
379
380static __net_init int sysctl_core_net_init(struct net *net)
381{
382 struct ctl_table *tbl;
383
384 net->core.sysctl_somaxconn = SOMAXCONN;
385
386 tbl = netns_core_table;
387 if (!net_eq(net, &init_net)) {
388 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
389 if (tbl == NULL)
390 goto err_dup;
391
392 tbl[0].data = &net->core.sysctl_somaxconn;
393
394 /* Don't export any sysctls to unprivileged users */
395 if (net->user_ns != &init_user_ns) {
396 tbl[0].procname = NULL;
397 }
398 }
399
400 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
401 if (net->core.sysctl_hdr == NULL)
402 goto err_reg;
403
404 return 0;
405
406err_reg:
407 if (tbl != netns_core_table)
408 kfree(tbl);
409err_dup:
410 return -ENOMEM;
411}
412
413static __net_exit void sysctl_core_net_exit(struct net *net)
414{
415 struct ctl_table *tbl;
416
417 tbl = net->core.sysctl_hdr->ctl_table_arg;
418 unregister_net_sysctl_table(net->core.sysctl_hdr);
419 BUG_ON(tbl == netns_core_table);
420 kfree(tbl);
421}
422
423static __net_initdata struct pernet_operations sysctl_core_ops = {
424 .init = sysctl_core_net_init,
425 .exit = sysctl_core_net_exit,
426};
427
428static __init int sysctl_core_init(void)
429{
430 register_net_sysctl(&init_net, "net/core", net_core_table);
431 return register_pernet_subsys(&sysctl_core_ops);
432}
433
434fs_initcall(sysctl_core_init);
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>
10#include <linux/module.h>
11#include <linux/socket.h>
12#include <linux/netdevice.h>
13#include <linux/ratelimit.h>
14#include <linux/vmalloc.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17
18#include <net/ip.h>
19#include <net/sock.h>
20#include <net/net_ratelimit.h>
21
22#ifdef CONFIG_RPS
23static int rps_sock_flow_sysctl(ctl_table *table, int write,
24 void __user *buffer, size_t *lenp, loff_t *ppos)
25{
26 unsigned int orig_size, size;
27 int ret, i;
28 ctl_table tmp = {
29 .data = &size,
30 .maxlen = sizeof(size),
31 .mode = table->mode
32 };
33 struct rps_sock_flow_table *orig_sock_table, *sock_table;
34 static DEFINE_MUTEX(sock_flow_mutex);
35
36 mutex_lock(&sock_flow_mutex);
37
38 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
39 lockdep_is_held(&sock_flow_mutex));
40 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
41
42 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
43
44 if (write) {
45 if (size) {
46 if (size > 1<<30) {
47 /* Enforce limit to prevent overflow */
48 mutex_unlock(&sock_flow_mutex);
49 return -EINVAL;
50 }
51 size = roundup_pow_of_two(size);
52 if (size != orig_size) {
53 sock_table =
54 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
55 if (!sock_table) {
56 mutex_unlock(&sock_flow_mutex);
57 return -ENOMEM;
58 }
59
60 sock_table->mask = size - 1;
61 } else
62 sock_table = orig_sock_table;
63
64 for (i = 0; i < size; i++)
65 sock_table->ents[i] = RPS_NO_CPU;
66 } else
67 sock_table = NULL;
68
69 if (sock_table != orig_sock_table) {
70 rcu_assign_pointer(rps_sock_flow_table, sock_table);
71 synchronize_rcu();
72 vfree(orig_sock_table);
73 }
74 }
75
76 mutex_unlock(&sock_flow_mutex);
77
78 return ret;
79}
80#endif /* CONFIG_RPS */
81
82static struct ctl_table net_core_table[] = {
83#ifdef CONFIG_NET
84 {
85 .procname = "wmem_max",
86 .data = &sysctl_wmem_max,
87 .maxlen = sizeof(int),
88 .mode = 0644,
89 .proc_handler = proc_dointvec
90 },
91 {
92 .procname = "rmem_max",
93 .data = &sysctl_rmem_max,
94 .maxlen = sizeof(int),
95 .mode = 0644,
96 .proc_handler = proc_dointvec
97 },
98 {
99 .procname = "wmem_default",
100 .data = &sysctl_wmem_default,
101 .maxlen = sizeof(int),
102 .mode = 0644,
103 .proc_handler = proc_dointvec
104 },
105 {
106 .procname = "rmem_default",
107 .data = &sysctl_rmem_default,
108 .maxlen = sizeof(int),
109 .mode = 0644,
110 .proc_handler = proc_dointvec
111 },
112 {
113 .procname = "dev_weight",
114 .data = &weight_p,
115 .maxlen = sizeof(int),
116 .mode = 0644,
117 .proc_handler = proc_dointvec
118 },
119 {
120 .procname = "netdev_max_backlog",
121 .data = &netdev_max_backlog,
122 .maxlen = sizeof(int),
123 .mode = 0644,
124 .proc_handler = proc_dointvec
125 },
126#ifdef CONFIG_BPF_JIT
127 {
128 .procname = "bpf_jit_enable",
129 .data = &bpf_jit_enable,
130 .maxlen = sizeof(int),
131 .mode = 0644,
132 .proc_handler = proc_dointvec
133 },
134#endif
135 {
136 .procname = "netdev_tstamp_prequeue",
137 .data = &netdev_tstamp_prequeue,
138 .maxlen = sizeof(int),
139 .mode = 0644,
140 .proc_handler = proc_dointvec
141 },
142 {
143 .procname = "message_cost",
144 .data = &net_ratelimit_state.interval,
145 .maxlen = sizeof(int),
146 .mode = 0644,
147 .proc_handler = proc_dointvec_jiffies,
148 },
149 {
150 .procname = "message_burst",
151 .data = &net_ratelimit_state.burst,
152 .maxlen = sizeof(int),
153 .mode = 0644,
154 .proc_handler = proc_dointvec,
155 },
156 {
157 .procname = "optmem_max",
158 .data = &sysctl_optmem_max,
159 .maxlen = sizeof(int),
160 .mode = 0644,
161 .proc_handler = proc_dointvec
162 },
163#ifdef CONFIG_RPS
164 {
165 .procname = "rps_sock_flow_entries",
166 .maxlen = sizeof(int),
167 .mode = 0644,
168 .proc_handler = rps_sock_flow_sysctl
169 },
170#endif
171#endif /* CONFIG_NET */
172 {
173 .procname = "netdev_budget",
174 .data = &netdev_budget,
175 .maxlen = sizeof(int),
176 .mode = 0644,
177 .proc_handler = proc_dointvec
178 },
179 {
180 .procname = "warnings",
181 .data = &net_msg_warn,
182 .maxlen = sizeof(int),
183 .mode = 0644,
184 .proc_handler = proc_dointvec
185 },
186 { }
187};
188
189static struct ctl_table netns_core_table[] = {
190 {
191 .procname = "somaxconn",
192 .data = &init_net.core.sysctl_somaxconn,
193 .maxlen = sizeof(int),
194 .mode = 0644,
195 .proc_handler = proc_dointvec
196 },
197 { }
198};
199
200__net_initdata struct ctl_path net_core_path[] = {
201 { .procname = "net", },
202 { .procname = "core", },
203 { },
204};
205
206static __net_init int sysctl_core_net_init(struct net *net)
207{
208 struct ctl_table *tbl;
209
210 net->core.sysctl_somaxconn = SOMAXCONN;
211
212 tbl = netns_core_table;
213 if (!net_eq(net, &init_net)) {
214 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
215 if (tbl == NULL)
216 goto err_dup;
217
218 tbl[0].data = &net->core.sysctl_somaxconn;
219 }
220
221 net->core.sysctl_hdr = register_net_sysctl_table(net,
222 net_core_path, tbl);
223 if (net->core.sysctl_hdr == NULL)
224 goto err_reg;
225
226 return 0;
227
228err_reg:
229 if (tbl != netns_core_table)
230 kfree(tbl);
231err_dup:
232 return -ENOMEM;
233}
234
235static __net_exit void sysctl_core_net_exit(struct net *net)
236{
237 struct ctl_table *tbl;
238
239 tbl = net->core.sysctl_hdr->ctl_table_arg;
240 unregister_net_sysctl_table(net->core.sysctl_hdr);
241 BUG_ON(tbl == netns_core_table);
242 kfree(tbl);
243}
244
245static __net_initdata struct pernet_operations sysctl_core_ops = {
246 .init = sysctl_core_net_init,
247 .exit = sysctl_core_net_exit,
248};
249
250static __init int sysctl_core_init(void)
251{
252 static struct ctl_table empty[1];
253
254 register_sysctl_paths(net_core_path, empty);
255 register_net_sysctl_rotable(net_core_path, net_core_table);
256 return register_pernet_subsys(&sysctl_core_ops);
257}
258
259fs_initcall(sysctl_core_init);