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1// SPDX-License-Identifier: GPL-2.0
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>
11#include <linux/module.h>
12#include <linux/socket.h>
13#include <linux/netdevice.h>
14#include <linux/ratelimit.h>
15#include <linux/vmalloc.h>
16#include <linux/init.h>
17#include <linux/slab.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 two = 2;
26static int three = 3;
27static int int_3600 = 3600;
28static int min_sndbuf = SOCK_MIN_SNDBUF;
29static int min_rcvbuf = SOCK_MIN_RCVBUF;
30static int max_skb_frags = MAX_SKB_FRAGS;
31static long long_one __maybe_unused = 1;
32static long long_max __maybe_unused = LONG_MAX;
33
34static int net_msg_warn; /* Unused, but still a sysctl */
35
36int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
37EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
38
39/* 0 - Keep current behavior:
40 * IPv4: inherit all current settings from init_net
41 * IPv6: reset all settings to default
42 * 1 - Both inherit all current settings from init_net
43 * 2 - Both reset all settings to default
44 * 3 - Both inherit all settings from current netns
45 */
46int sysctl_devconf_inherit_init_net __read_mostly;
47EXPORT_SYMBOL(sysctl_devconf_inherit_init_net);
48
49#ifdef CONFIG_RPS
50static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
51 void *buffer, size_t *lenp, loff_t *ppos)
52{
53 unsigned int orig_size, size;
54 int ret, i;
55 struct ctl_table tmp = {
56 .data = &size,
57 .maxlen = sizeof(size),
58 .mode = table->mode
59 };
60 struct rps_sock_flow_table *orig_sock_table, *sock_table;
61 static DEFINE_MUTEX(sock_flow_mutex);
62
63 mutex_lock(&sock_flow_mutex);
64
65 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
66 lockdep_is_held(&sock_flow_mutex));
67 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
68
69 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
70
71 if (write) {
72 if (size) {
73 if (size > 1<<29) {
74 /* Enforce limit to prevent overflow */
75 mutex_unlock(&sock_flow_mutex);
76 return -EINVAL;
77 }
78 size = roundup_pow_of_two(size);
79 if (size != orig_size) {
80 sock_table =
81 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
82 if (!sock_table) {
83 mutex_unlock(&sock_flow_mutex);
84 return -ENOMEM;
85 }
86 rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
87 sock_table->mask = size - 1;
88 } else
89 sock_table = orig_sock_table;
90
91 for (i = 0; i < size; i++)
92 sock_table->ents[i] = RPS_NO_CPU;
93 } else
94 sock_table = NULL;
95
96 if (sock_table != orig_sock_table) {
97 rcu_assign_pointer(rps_sock_flow_table, sock_table);
98 if (sock_table) {
99 static_branch_inc(&rps_needed);
100 static_branch_inc(&rfs_needed);
101 }
102 if (orig_sock_table) {
103 static_branch_dec(&rps_needed);
104 static_branch_dec(&rfs_needed);
105 synchronize_rcu();
106 vfree(orig_sock_table);
107 }
108 }
109 }
110
111 mutex_unlock(&sock_flow_mutex);
112
113 return ret;
114}
115#endif /* CONFIG_RPS */
116
117#ifdef CONFIG_NET_FLOW_LIMIT
118static DEFINE_MUTEX(flow_limit_update_mutex);
119
120static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
121 void *buffer, size_t *lenp, loff_t *ppos)
122{
123 struct sd_flow_limit *cur;
124 struct softnet_data *sd;
125 cpumask_var_t mask;
126 int i, len, ret = 0;
127
128 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
129 return -ENOMEM;
130
131 if (write) {
132 ret = cpumask_parse(buffer, mask);
133 if (ret)
134 goto done;
135
136 mutex_lock(&flow_limit_update_mutex);
137 len = sizeof(*cur) + netdev_flow_limit_table_len;
138 for_each_possible_cpu(i) {
139 sd = &per_cpu(softnet_data, i);
140 cur = rcu_dereference_protected(sd->flow_limit,
141 lockdep_is_held(&flow_limit_update_mutex));
142 if (cur && !cpumask_test_cpu(i, mask)) {
143 RCU_INIT_POINTER(sd->flow_limit, NULL);
144 synchronize_rcu();
145 kfree(cur);
146 } else if (!cur && cpumask_test_cpu(i, mask)) {
147 cur = kzalloc_node(len, GFP_KERNEL,
148 cpu_to_node(i));
149 if (!cur) {
150 /* not unwinding previous changes */
151 ret = -ENOMEM;
152 goto write_unlock;
153 }
154 cur->num_buckets = netdev_flow_limit_table_len;
155 rcu_assign_pointer(sd->flow_limit, cur);
156 }
157 }
158write_unlock:
159 mutex_unlock(&flow_limit_update_mutex);
160 } else {
161 char kbuf[128];
162
163 if (*ppos || !*lenp) {
164 *lenp = 0;
165 goto done;
166 }
167
168 cpumask_clear(mask);
169 rcu_read_lock();
170 for_each_possible_cpu(i) {
171 sd = &per_cpu(softnet_data, i);
172 if (rcu_dereference(sd->flow_limit))
173 cpumask_set_cpu(i, mask);
174 }
175 rcu_read_unlock();
176
177 len = min(sizeof(kbuf) - 1, *lenp);
178 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
179 if (!len) {
180 *lenp = 0;
181 goto done;
182 }
183 if (len < *lenp)
184 kbuf[len++] = '\n';
185 memcpy(buffer, kbuf, len);
186 *lenp = len;
187 *ppos += len;
188 }
189
190done:
191 free_cpumask_var(mask);
192 return ret;
193}
194
195static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
196 void *buffer, size_t *lenp, loff_t *ppos)
197{
198 unsigned int old, *ptr;
199 int ret;
200
201 mutex_lock(&flow_limit_update_mutex);
202
203 ptr = table->data;
204 old = *ptr;
205 ret = proc_dointvec(table, write, buffer, lenp, ppos);
206 if (!ret && write && !is_power_of_2(*ptr)) {
207 *ptr = old;
208 ret = -EINVAL;
209 }
210
211 mutex_unlock(&flow_limit_update_mutex);
212 return ret;
213}
214#endif /* CONFIG_NET_FLOW_LIMIT */
215
216#ifdef CONFIG_NET_SCHED
217static int set_default_qdisc(struct ctl_table *table, int write,
218 void *buffer, size_t *lenp, loff_t *ppos)
219{
220 char id[IFNAMSIZ];
221 struct ctl_table tbl = {
222 .data = id,
223 .maxlen = IFNAMSIZ,
224 };
225 int ret;
226
227 qdisc_get_default(id, IFNAMSIZ);
228
229 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
230 if (write && ret == 0)
231 ret = qdisc_set_default(id);
232 return ret;
233}
234#endif
235
236static int proc_do_dev_weight(struct ctl_table *table, int write,
237 void *buffer, size_t *lenp, loff_t *ppos)
238{
239 int ret;
240
241 ret = proc_dointvec(table, write, buffer, lenp, ppos);
242 if (ret != 0)
243 return ret;
244
245 dev_rx_weight = weight_p * dev_weight_rx_bias;
246 dev_tx_weight = weight_p * dev_weight_tx_bias;
247
248 return ret;
249}
250
251static int proc_do_rss_key(struct ctl_table *table, int write,
252 void *buffer, size_t *lenp, loff_t *ppos)
253{
254 struct ctl_table fake_table;
255 char buf[NETDEV_RSS_KEY_LEN * 3];
256
257 snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
258 fake_table.data = buf;
259 fake_table.maxlen = sizeof(buf);
260 return proc_dostring(&fake_table, write, buffer, lenp, ppos);
261}
262
263#ifdef CONFIG_BPF_JIT
264static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
265 void *buffer, size_t *lenp,
266 loff_t *ppos)
267{
268 int ret, jit_enable = *(int *)table->data;
269 struct ctl_table tmp = *table;
270
271 if (write && !capable(CAP_SYS_ADMIN))
272 return -EPERM;
273
274 tmp.data = &jit_enable;
275 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
276 if (write && !ret) {
277 if (jit_enable < 2 ||
278 (jit_enable == 2 && bpf_dump_raw_ok(current_cred()))) {
279 *(int *)table->data = jit_enable;
280 if (jit_enable == 2)
281 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
282 } else {
283 ret = -EPERM;
284 }
285 }
286 return ret;
287}
288
289# ifdef CONFIG_HAVE_EBPF_JIT
290static int
291proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
292 void *buffer, size_t *lenp, loff_t *ppos)
293{
294 if (!capable(CAP_SYS_ADMIN))
295 return -EPERM;
296
297 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
298}
299# endif /* CONFIG_HAVE_EBPF_JIT */
300
301static int
302proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,
303 void *buffer, size_t *lenp, loff_t *ppos)
304{
305 if (!capable(CAP_SYS_ADMIN))
306 return -EPERM;
307
308 return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
309}
310#endif
311
312static struct ctl_table net_core_table[] = {
313 {
314 .procname = "wmem_max",
315 .data = &sysctl_wmem_max,
316 .maxlen = sizeof(int),
317 .mode = 0644,
318 .proc_handler = proc_dointvec_minmax,
319 .extra1 = &min_sndbuf,
320 },
321 {
322 .procname = "rmem_max",
323 .data = &sysctl_rmem_max,
324 .maxlen = sizeof(int),
325 .mode = 0644,
326 .proc_handler = proc_dointvec_minmax,
327 .extra1 = &min_rcvbuf,
328 },
329 {
330 .procname = "wmem_default",
331 .data = &sysctl_wmem_default,
332 .maxlen = sizeof(int),
333 .mode = 0644,
334 .proc_handler = proc_dointvec_minmax,
335 .extra1 = &min_sndbuf,
336 },
337 {
338 .procname = "rmem_default",
339 .data = &sysctl_rmem_default,
340 .maxlen = sizeof(int),
341 .mode = 0644,
342 .proc_handler = proc_dointvec_minmax,
343 .extra1 = &min_rcvbuf,
344 },
345 {
346 .procname = "dev_weight",
347 .data = &weight_p,
348 .maxlen = sizeof(int),
349 .mode = 0644,
350 .proc_handler = proc_do_dev_weight,
351 },
352 {
353 .procname = "dev_weight_rx_bias",
354 .data = &dev_weight_rx_bias,
355 .maxlen = sizeof(int),
356 .mode = 0644,
357 .proc_handler = proc_do_dev_weight,
358 },
359 {
360 .procname = "dev_weight_tx_bias",
361 .data = &dev_weight_tx_bias,
362 .maxlen = sizeof(int),
363 .mode = 0644,
364 .proc_handler = proc_do_dev_weight,
365 },
366 {
367 .procname = "netdev_max_backlog",
368 .data = &netdev_max_backlog,
369 .maxlen = sizeof(int),
370 .mode = 0644,
371 .proc_handler = proc_dointvec
372 },
373 {
374 .procname = "netdev_rss_key",
375 .data = &netdev_rss_key,
376 .maxlen = sizeof(int),
377 .mode = 0444,
378 .proc_handler = proc_do_rss_key,
379 },
380#ifdef CONFIG_BPF_JIT
381 {
382 .procname = "bpf_jit_enable",
383 .data = &bpf_jit_enable,
384 .maxlen = sizeof(int),
385 .mode = 0644,
386 .proc_handler = proc_dointvec_minmax_bpf_enable,
387# ifdef CONFIG_BPF_JIT_ALWAYS_ON
388 .extra1 = SYSCTL_ONE,
389 .extra2 = SYSCTL_ONE,
390# else
391 .extra1 = SYSCTL_ZERO,
392 .extra2 = &two,
393# endif
394 },
395# ifdef CONFIG_HAVE_EBPF_JIT
396 {
397 .procname = "bpf_jit_harden",
398 .data = &bpf_jit_harden,
399 .maxlen = sizeof(int),
400 .mode = 0600,
401 .proc_handler = proc_dointvec_minmax_bpf_restricted,
402 .extra1 = SYSCTL_ZERO,
403 .extra2 = &two,
404 },
405 {
406 .procname = "bpf_jit_kallsyms",
407 .data = &bpf_jit_kallsyms,
408 .maxlen = sizeof(int),
409 .mode = 0600,
410 .proc_handler = proc_dointvec_minmax_bpf_restricted,
411 .extra1 = SYSCTL_ZERO,
412 .extra2 = SYSCTL_ONE,
413 },
414# endif
415 {
416 .procname = "bpf_jit_limit",
417 .data = &bpf_jit_limit,
418 .maxlen = sizeof(long),
419 .mode = 0600,
420 .proc_handler = proc_dolongvec_minmax_bpf_restricted,
421 .extra1 = &long_one,
422 .extra2 = &long_max,
423 },
424#endif
425 {
426 .procname = "netdev_tstamp_prequeue",
427 .data = &netdev_tstamp_prequeue,
428 .maxlen = sizeof(int),
429 .mode = 0644,
430 .proc_handler = proc_dointvec
431 },
432 {
433 .procname = "message_cost",
434 .data = &net_ratelimit_state.interval,
435 .maxlen = sizeof(int),
436 .mode = 0644,
437 .proc_handler = proc_dointvec_jiffies,
438 },
439 {
440 .procname = "message_burst",
441 .data = &net_ratelimit_state.burst,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec,
445 },
446 {
447 .procname = "optmem_max",
448 .data = &sysctl_optmem_max,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec
452 },
453 {
454 .procname = "tstamp_allow_data",
455 .data = &sysctl_tstamp_allow_data,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec_minmax,
459 .extra1 = SYSCTL_ZERO,
460 .extra2 = SYSCTL_ONE
461 },
462#ifdef CONFIG_RPS
463 {
464 .procname = "rps_sock_flow_entries",
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = rps_sock_flow_sysctl
468 },
469#endif
470#ifdef CONFIG_NET_FLOW_LIMIT
471 {
472 .procname = "flow_limit_cpu_bitmap",
473 .mode = 0644,
474 .proc_handler = flow_limit_cpu_sysctl
475 },
476 {
477 .procname = "flow_limit_table_len",
478 .data = &netdev_flow_limit_table_len,
479 .maxlen = sizeof(int),
480 .mode = 0644,
481 .proc_handler = flow_limit_table_len_sysctl
482 },
483#endif /* CONFIG_NET_FLOW_LIMIT */
484#ifdef CONFIG_NET_RX_BUSY_POLL
485 {
486 .procname = "busy_poll",
487 .data = &sysctl_net_busy_poll,
488 .maxlen = sizeof(unsigned int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec_minmax,
491 .extra1 = SYSCTL_ZERO,
492 },
493 {
494 .procname = "busy_read",
495 .data = &sysctl_net_busy_read,
496 .maxlen = sizeof(unsigned int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec_minmax,
499 .extra1 = SYSCTL_ZERO,
500 },
501#endif
502#ifdef CONFIG_NET_SCHED
503 {
504 .procname = "default_qdisc",
505 .mode = 0644,
506 .maxlen = IFNAMSIZ,
507 .proc_handler = set_default_qdisc
508 },
509#endif
510 {
511 .procname = "netdev_budget",
512 .data = &netdev_budget,
513 .maxlen = sizeof(int),
514 .mode = 0644,
515 .proc_handler = proc_dointvec
516 },
517 {
518 .procname = "warnings",
519 .data = &net_msg_warn,
520 .maxlen = sizeof(int),
521 .mode = 0644,
522 .proc_handler = proc_dointvec
523 },
524 {
525 .procname = "max_skb_frags",
526 .data = &sysctl_max_skb_frags,
527 .maxlen = sizeof(int),
528 .mode = 0644,
529 .proc_handler = proc_dointvec_minmax,
530 .extra1 = SYSCTL_ONE,
531 .extra2 = &max_skb_frags,
532 },
533 {
534 .procname = "netdev_budget_usecs",
535 .data = &netdev_budget_usecs,
536 .maxlen = sizeof(unsigned int),
537 .mode = 0644,
538 .proc_handler = proc_dointvec_minmax,
539 .extra1 = SYSCTL_ZERO,
540 },
541 {
542 .procname = "fb_tunnels_only_for_init_net",
543 .data = &sysctl_fb_tunnels_only_for_init_net,
544 .maxlen = sizeof(int),
545 .mode = 0644,
546 .proc_handler = proc_dointvec_minmax,
547 .extra1 = SYSCTL_ZERO,
548 .extra2 = &two,
549 },
550 {
551 .procname = "devconf_inherit_init_net",
552 .data = &sysctl_devconf_inherit_init_net,
553 .maxlen = sizeof(int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec_minmax,
556 .extra1 = SYSCTL_ZERO,
557 .extra2 = &three,
558 },
559 {
560 .procname = "high_order_alloc_disable",
561 .data = &net_high_order_alloc_disable_key.key,
562 .maxlen = sizeof(net_high_order_alloc_disable_key),
563 .mode = 0644,
564 .proc_handler = proc_do_static_key,
565 },
566 {
567 .procname = "gro_normal_batch",
568 .data = &gro_normal_batch,
569 .maxlen = sizeof(unsigned int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec_minmax,
572 .extra1 = SYSCTL_ONE,
573 },
574 {
575 .procname = "netdev_unregister_timeout_secs",
576 .data = &netdev_unregister_timeout_secs,
577 .maxlen = sizeof(unsigned int),
578 .mode = 0644,
579 .proc_handler = proc_dointvec_minmax,
580 .extra1 = SYSCTL_ONE,
581 .extra2 = &int_3600,
582 },
583 { }
584};
585
586static struct ctl_table netns_core_table[] = {
587 {
588 .procname = "somaxconn",
589 .data = &init_net.core.sysctl_somaxconn,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .extra1 = SYSCTL_ZERO,
593 .proc_handler = proc_dointvec_minmax
594 },
595 { }
596};
597
598static int __init fb_tunnels_only_for_init_net_sysctl_setup(char *str)
599{
600 /* fallback tunnels for initns only */
601 if (!strncmp(str, "initns", 6))
602 sysctl_fb_tunnels_only_for_init_net = 1;
603 /* no fallback tunnels anywhere */
604 else if (!strncmp(str, "none", 4))
605 sysctl_fb_tunnels_only_for_init_net = 2;
606
607 return 1;
608}
609__setup("fb_tunnels=", fb_tunnels_only_for_init_net_sysctl_setup);
610
611static __net_init int sysctl_core_net_init(struct net *net)
612{
613 struct ctl_table *tbl;
614
615 tbl = netns_core_table;
616 if (!net_eq(net, &init_net)) {
617 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
618 if (tbl == NULL)
619 goto err_dup;
620
621 tbl[0].data = &net->core.sysctl_somaxconn;
622
623 /* Don't export any sysctls to unprivileged users */
624 if (net->user_ns != &init_user_ns) {
625 tbl[0].procname = NULL;
626 }
627 }
628
629 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
630 if (net->core.sysctl_hdr == NULL)
631 goto err_reg;
632
633 return 0;
634
635err_reg:
636 if (tbl != netns_core_table)
637 kfree(tbl);
638err_dup:
639 return -ENOMEM;
640}
641
642static __net_exit void sysctl_core_net_exit(struct net *net)
643{
644 struct ctl_table *tbl;
645
646 tbl = net->core.sysctl_hdr->ctl_table_arg;
647 unregister_net_sysctl_table(net->core.sysctl_hdr);
648 BUG_ON(tbl == netns_core_table);
649 kfree(tbl);
650}
651
652static __net_initdata struct pernet_operations sysctl_core_ops = {
653 .init = sysctl_core_net_init,
654 .exit = sysctl_core_net_exit,
655};
656
657static __init int sysctl_core_init(void)
658{
659 register_net_sysctl(&init_net, "net/core", net_core_table);
660 return register_pernet_subsys(&sysctl_core_ops);
661}
662
663fs_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 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);