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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
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);
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 min_sndbuf = SOCK_MIN_SNDBUF;
28static int min_rcvbuf = SOCK_MIN_RCVBUF;
29static int max_skb_frags = MAX_SKB_FRAGS;
30
31static int net_msg_warn; /* Unused, but still a sysctl */
32
33#ifdef CONFIG_RPS
34static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
35 void __user *buffer, size_t *lenp, loff_t *ppos)
36{
37 unsigned int orig_size, size;
38 int ret, i;
39 struct ctl_table tmp = {
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
49 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
50 lockdep_is_held(&sock_flow_mutex));
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) {
57 if (size > 1<<29) {
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 }
70 rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
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);
82 if (sock_table) {
83 static_key_slow_inc(&rps_needed);
84 static_key_slow_inc(&rfs_needed);
85 }
86 if (orig_sock_table) {
87 static_key_slow_dec(&rps_needed);
88 static_key_slow_dec(&rfs_needed);
89 synchronize_rcu();
90 vfree(orig_sock_table);
91 }
92 }
93 }
94
95 mutex_unlock(&sock_flow_mutex);
96
97 return ret;
98}
99#endif /* CONFIG_RPS */
100
101#ifdef CONFIG_NET_FLOW_LIMIT
102static DEFINE_MUTEX(flow_limit_update_mutex);
103
104static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
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)) {
132 cur = kzalloc_node(len, GFP_KERNEL,
133 cpu_to_node(i));
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 }
143write_unlock:
144 mutex_unlock(&flow_limit_update_mutex);
145 } else {
146 char kbuf[128];
147
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
162 len = min(sizeof(kbuf) - 1, *lenp);
163 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
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;
176 }
177
178done:
179 free_cpumask_var(mask);
180 return ret;
181}
182
183static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
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
205#ifdef CONFIG_NET_SCHED
206static 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
225static 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
237static struct ctl_table net_core_table[] = {
238#ifdef CONFIG_NET
239 {
240 .procname = "wmem_max",
241 .data = &sysctl_wmem_max,
242 .maxlen = sizeof(int),
243 .mode = 0644,
244 .proc_handler = proc_dointvec_minmax,
245 .extra1 = &min_sndbuf,
246 },
247 {
248 .procname = "rmem_max",
249 .data = &sysctl_rmem_max,
250 .maxlen = sizeof(int),
251 .mode = 0644,
252 .proc_handler = proc_dointvec_minmax,
253 .extra1 = &min_rcvbuf,
254 },
255 {
256 .procname = "wmem_default",
257 .data = &sysctl_wmem_default,
258 .maxlen = sizeof(int),
259 .mode = 0644,
260 .proc_handler = proc_dointvec_minmax,
261 .extra1 = &min_sndbuf,
262 },
263 {
264 .procname = "rmem_default",
265 .data = &sysctl_rmem_default,
266 .maxlen = sizeof(int),
267 .mode = 0644,
268 .proc_handler = proc_dointvec_minmax,
269 .extra1 = &min_rcvbuf,
270 },
271 {
272 .procname = "dev_weight",
273 .data = &weight_p,
274 .maxlen = sizeof(int),
275 .mode = 0644,
276 .proc_handler = proc_dointvec
277 },
278 {
279 .procname = "netdev_max_backlog",
280 .data = &netdev_max_backlog,
281 .maxlen = sizeof(int),
282 .mode = 0644,
283 .proc_handler = proc_dointvec
284 },
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 },
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 },
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
309#endif
310 {
311 .procname = "netdev_tstamp_prequeue",
312 .data = &netdev_tstamp_prequeue,
313 .maxlen = sizeof(int),
314 .mode = 0644,
315 .proc_handler = proc_dointvec
316 },
317 {
318 .procname = "message_cost",
319 .data = &net_ratelimit_state.interval,
320 .maxlen = sizeof(int),
321 .mode = 0644,
322 .proc_handler = proc_dointvec_jiffies,
323 },
324 {
325 .procname = "message_burst",
326 .data = &net_ratelimit_state.burst,
327 .maxlen = sizeof(int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec,
330 },
331 {
332 .procname = "optmem_max",
333 .data = &sysctl_optmem_max,
334 .maxlen = sizeof(int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec
337 },
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 },
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
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 */
369#ifdef CONFIG_NET_RX_BUSY_POLL
370 {
371 .procname = "busy_poll",
372 .data = &sysctl_net_busy_poll,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec
376 },
377 {
378 .procname = "busy_read",
379 .data = &sysctl_net_busy_read,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec
383 },
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 },
392#endif
393#endif /* CONFIG_NET */
394 {
395 .procname = "netdev_budget",
396 .data = &netdev_budget,
397 .maxlen = sizeof(int),
398 .mode = 0644,
399 .proc_handler = proc_dointvec
400 },
401 {
402 .procname = "warnings",
403 .data = &net_msg_warn,
404 .maxlen = sizeof(int),
405 .mode = 0644,
406 .proc_handler = proc_dointvec
407 },
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 },
417 { }
418};
419
420static struct ctl_table netns_core_table[] = {
421 {
422 .procname = "somaxconn",
423 .data = &init_net.core.sysctl_somaxconn,
424 .maxlen = sizeof(int),
425 .mode = 0644,
426 .extra1 = &zero,
427 .proc_handler = proc_dointvec_minmax
428 },
429 { }
430};
431
432static __net_init int sysctl_core_net_init(struct net *net)
433{
434 struct ctl_table *tbl;
435
436 net->core.sysctl_somaxconn = SOMAXCONN;
437
438 tbl = netns_core_table;
439 if (!net_eq(net, &init_net)) {
440 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
441 if (tbl == NULL)
442 goto err_dup;
443
444 tbl[0].data = &net->core.sysctl_somaxconn;
445
446 /* Don't export any sysctls to unprivileged users */
447 if (net->user_ns != &init_user_ns) {
448 tbl[0].procname = NULL;
449 }
450 }
451
452 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
453 if (net->core.sysctl_hdr == NULL)
454 goto err_reg;
455
456 return 0;
457
458err_reg:
459 if (tbl != netns_core_table)
460 kfree(tbl);
461err_dup:
462 return -ENOMEM;
463}
464
465static __net_exit void sysctl_core_net_exit(struct net *net)
466{
467 struct ctl_table *tbl;
468
469 tbl = net->core.sysctl_hdr->ctl_table_arg;
470 unregister_net_sysctl_table(net->core.sysctl_hdr);
471 BUG_ON(tbl == netns_core_table);
472 kfree(tbl);
473}
474
475static __net_initdata struct pernet_operations sysctl_core_ops = {
476 .init = sysctl_core_net_init,
477 .exit = sysctl_core_net_exit,
478};
479
480static __init int sysctl_core_init(void)
481{
482 register_net_sysctl(&init_net, "net/core", net_core_table);
483 return register_pernet_subsys(&sysctl_core_ops);
484}
485
486fs_initcall(sysctl_core_init);