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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// 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 __maybe_unused = 2;
26static int three = 3;
27static int min_sndbuf = SOCK_MIN_SNDBUF;
28static int min_rcvbuf = SOCK_MIN_RCVBUF;
29static int max_skb_frags = MAX_SKB_FRAGS;
30static long long_one __maybe_unused = 1;
31static long long_max __maybe_unused = LONG_MAX;
32
33static int net_msg_warn; /* Unused, but still a sysctl */
34
35int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
36EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
37
38/* 0 - Keep current behavior:
39 * IPv4: inherit all current settings from init_net
40 * IPv6: reset all settings to default
41 * 1 - Both inherit all current settings from init_net
42 * 2 - Both reset all settings to default
43 * 3 - Both inherit all settings from current netns
44 */
45int sysctl_devconf_inherit_init_net __read_mostly;
46EXPORT_SYMBOL(sysctl_devconf_inherit_init_net);
47
48#ifdef CONFIG_RPS
49static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
50 void *buffer, size_t *lenp, loff_t *ppos)
51{
52 unsigned int orig_size, size;
53 int ret, i;
54 struct ctl_table tmp = {
55 .data = &size,
56 .maxlen = sizeof(size),
57 .mode = table->mode
58 };
59 struct rps_sock_flow_table *orig_sock_table, *sock_table;
60 static DEFINE_MUTEX(sock_flow_mutex);
61
62 mutex_lock(&sock_flow_mutex);
63
64 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
65 lockdep_is_held(&sock_flow_mutex));
66 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
67
68 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
69
70 if (write) {
71 if (size) {
72 if (size > 1<<29) {
73 /* Enforce limit to prevent overflow */
74 mutex_unlock(&sock_flow_mutex);
75 return -EINVAL;
76 }
77 size = roundup_pow_of_two(size);
78 if (size != orig_size) {
79 sock_table =
80 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
81 if (!sock_table) {
82 mutex_unlock(&sock_flow_mutex);
83 return -ENOMEM;
84 }
85 rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
86 sock_table->mask = size - 1;
87 } else
88 sock_table = orig_sock_table;
89
90 for (i = 0; i < size; i++)
91 sock_table->ents[i] = RPS_NO_CPU;
92 } else
93 sock_table = NULL;
94
95 if (sock_table != orig_sock_table) {
96 rcu_assign_pointer(rps_sock_flow_table, sock_table);
97 if (sock_table) {
98 static_branch_inc(&rps_needed);
99 static_branch_inc(&rfs_needed);
100 }
101 if (orig_sock_table) {
102 static_branch_dec(&rps_needed);
103 static_branch_dec(&rfs_needed);
104 synchronize_rcu();
105 vfree(orig_sock_table);
106 }
107 }
108 }
109
110 mutex_unlock(&sock_flow_mutex);
111
112 return ret;
113}
114#endif /* CONFIG_RPS */
115
116#ifdef CONFIG_NET_FLOW_LIMIT
117static DEFINE_MUTEX(flow_limit_update_mutex);
118
119static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
120 void *buffer, size_t *lenp, loff_t *ppos)
121{
122 struct sd_flow_limit *cur;
123 struct softnet_data *sd;
124 cpumask_var_t mask;
125 int i, len, ret = 0;
126
127 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
128 return -ENOMEM;
129
130 if (write) {
131 ret = cpumask_parse(buffer, mask);
132 if (ret)
133 goto done;
134
135 mutex_lock(&flow_limit_update_mutex);
136 len = sizeof(*cur) + netdev_flow_limit_table_len;
137 for_each_possible_cpu(i) {
138 sd = &per_cpu(softnet_data, i);
139 cur = rcu_dereference_protected(sd->flow_limit,
140 lockdep_is_held(&flow_limit_update_mutex));
141 if (cur && !cpumask_test_cpu(i, mask)) {
142 RCU_INIT_POINTER(sd->flow_limit, NULL);
143 synchronize_rcu();
144 kfree(cur);
145 } else if (!cur && cpumask_test_cpu(i, mask)) {
146 cur = kzalloc_node(len, GFP_KERNEL,
147 cpu_to_node(i));
148 if (!cur) {
149 /* not unwinding previous changes */
150 ret = -ENOMEM;
151 goto write_unlock;
152 }
153 cur->num_buckets = netdev_flow_limit_table_len;
154 rcu_assign_pointer(sd->flow_limit, cur);
155 }
156 }
157write_unlock:
158 mutex_unlock(&flow_limit_update_mutex);
159 } else {
160 char kbuf[128];
161
162 if (*ppos || !*lenp) {
163 *lenp = 0;
164 goto done;
165 }
166
167 cpumask_clear(mask);
168 rcu_read_lock();
169 for_each_possible_cpu(i) {
170 sd = &per_cpu(softnet_data, i);
171 if (rcu_dereference(sd->flow_limit))
172 cpumask_set_cpu(i, mask);
173 }
174 rcu_read_unlock();
175
176 len = min(sizeof(kbuf) - 1, *lenp);
177 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
178 if (!len) {
179 *lenp = 0;
180 goto done;
181 }
182 if (len < *lenp)
183 kbuf[len++] = '\n';
184 memcpy(buffer, kbuf, len);
185 *lenp = len;
186 *ppos += len;
187 }
188
189done:
190 free_cpumask_var(mask);
191 return ret;
192}
193
194static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
195 void *buffer, size_t *lenp, loff_t *ppos)
196{
197 unsigned int old, *ptr;
198 int ret;
199
200 mutex_lock(&flow_limit_update_mutex);
201
202 ptr = table->data;
203 old = *ptr;
204 ret = proc_dointvec(table, write, buffer, lenp, ppos);
205 if (!ret && write && !is_power_of_2(*ptr)) {
206 *ptr = old;
207 ret = -EINVAL;
208 }
209
210 mutex_unlock(&flow_limit_update_mutex);
211 return ret;
212}
213#endif /* CONFIG_NET_FLOW_LIMIT */
214
215#ifdef CONFIG_NET_SCHED
216static int set_default_qdisc(struct ctl_table *table, int write,
217 void *buffer, size_t *lenp, loff_t *ppos)
218{
219 char id[IFNAMSIZ];
220 struct ctl_table tbl = {
221 .data = id,
222 .maxlen = IFNAMSIZ,
223 };
224 int ret;
225
226 qdisc_get_default(id, IFNAMSIZ);
227
228 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
229 if (write && ret == 0)
230 ret = qdisc_set_default(id);
231 return ret;
232}
233#endif
234
235static int proc_do_dev_weight(struct ctl_table *table, int write,
236 void *buffer, size_t *lenp, loff_t *ppos)
237{
238 int ret;
239
240 ret = proc_dointvec(table, write, buffer, lenp, ppos);
241 if (ret != 0)
242 return ret;
243
244 dev_rx_weight = weight_p * dev_weight_rx_bias;
245 dev_tx_weight = weight_p * dev_weight_tx_bias;
246
247 return ret;
248}
249
250static int proc_do_rss_key(struct ctl_table *table, int write,
251 void *buffer, size_t *lenp, loff_t *ppos)
252{
253 struct ctl_table fake_table;
254 char buf[NETDEV_RSS_KEY_LEN * 3];
255
256 snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
257 fake_table.data = buf;
258 fake_table.maxlen = sizeof(buf);
259 return proc_dostring(&fake_table, write, buffer, lenp, ppos);
260}
261
262#ifdef CONFIG_BPF_JIT
263static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
264 void *buffer, size_t *lenp,
265 loff_t *ppos)
266{
267 int ret, jit_enable = *(int *)table->data;
268 struct ctl_table tmp = *table;
269
270 if (write && !capable(CAP_SYS_ADMIN))
271 return -EPERM;
272
273 tmp.data = &jit_enable;
274 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
275 if (write && !ret) {
276 if (jit_enable < 2 ||
277 (jit_enable == 2 && bpf_dump_raw_ok(current_cred()))) {
278 *(int *)table->data = jit_enable;
279 if (jit_enable == 2)
280 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
281 } else {
282 ret = -EPERM;
283 }
284 }
285 return ret;
286}
287
288# ifdef CONFIG_HAVE_EBPF_JIT
289static int
290proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
291 void *buffer, size_t *lenp, loff_t *ppos)
292{
293 if (!capable(CAP_SYS_ADMIN))
294 return -EPERM;
295
296 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
297}
298# endif /* CONFIG_HAVE_EBPF_JIT */
299
300static int
301proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,
302 void *buffer, size_t *lenp, loff_t *ppos)
303{
304 if (!capable(CAP_SYS_ADMIN))
305 return -EPERM;
306
307 return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
308}
309#endif
310
311static struct ctl_table net_core_table[] = {
312#ifdef CONFIG_NET
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#endif /* CONFIG_NET */
511 {
512 .procname = "netdev_budget",
513 .data = &netdev_budget,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec
517 },
518 {
519 .procname = "warnings",
520 .data = &net_msg_warn,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = proc_dointvec
524 },
525 {
526 .procname = "max_skb_frags",
527 .data = &sysctl_max_skb_frags,
528 .maxlen = sizeof(int),
529 .mode = 0644,
530 .proc_handler = proc_dointvec_minmax,
531 .extra1 = SYSCTL_ONE,
532 .extra2 = &max_skb_frags,
533 },
534 {
535 .procname = "netdev_budget_usecs",
536 .data = &netdev_budget_usecs,
537 .maxlen = sizeof(unsigned int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec_minmax,
540 .extra1 = SYSCTL_ZERO,
541 },
542 {
543 .procname = "fb_tunnels_only_for_init_net",
544 .data = &sysctl_fb_tunnels_only_for_init_net,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec_minmax,
548 .extra1 = SYSCTL_ZERO,
549 .extra2 = SYSCTL_ONE,
550 },
551 {
552 .procname = "devconf_inherit_init_net",
553 .data = &sysctl_devconf_inherit_init_net,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 .proc_handler = proc_dointvec_minmax,
557 .extra1 = SYSCTL_ZERO,
558 .extra2 = &three,
559 },
560 {
561 .procname = "high_order_alloc_disable",
562 .data = &net_high_order_alloc_disable_key.key,
563 .maxlen = sizeof(net_high_order_alloc_disable_key),
564 .mode = 0644,
565 .proc_handler = proc_do_static_key,
566 },
567 {
568 .procname = "gro_normal_batch",
569 .data = &gro_normal_batch,
570 .maxlen = sizeof(unsigned int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec_minmax,
573 .extra1 = SYSCTL_ONE,
574 },
575 { }
576};
577
578static struct ctl_table netns_core_table[] = {
579 {
580 .procname = "somaxconn",
581 .data = &init_net.core.sysctl_somaxconn,
582 .maxlen = sizeof(int),
583 .mode = 0644,
584 .extra1 = SYSCTL_ZERO,
585 .proc_handler = proc_dointvec_minmax
586 },
587 { }
588};
589
590static __net_init int sysctl_core_net_init(struct net *net)
591{
592 struct ctl_table *tbl;
593
594 tbl = netns_core_table;
595 if (!net_eq(net, &init_net)) {
596 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
597 if (tbl == NULL)
598 goto err_dup;
599
600 tbl[0].data = &net->core.sysctl_somaxconn;
601
602 /* Don't export any sysctls to unprivileged users */
603 if (net->user_ns != &init_user_ns) {
604 tbl[0].procname = NULL;
605 }
606 }
607
608 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
609 if (net->core.sysctl_hdr == NULL)
610 goto err_reg;
611
612 return 0;
613
614err_reg:
615 if (tbl != netns_core_table)
616 kfree(tbl);
617err_dup:
618 return -ENOMEM;
619}
620
621static __net_exit void sysctl_core_net_exit(struct net *net)
622{
623 struct ctl_table *tbl;
624
625 tbl = net->core.sysctl_hdr->ctl_table_arg;
626 unregister_net_sysctl_table(net->core.sysctl_hdr);
627 BUG_ON(tbl == netns_core_table);
628 kfree(tbl);
629}
630
631static __net_initdata struct pernet_operations sysctl_core_ops = {
632 .init = sysctl_core_net_init,
633 .exit = sysctl_core_net_exit,
634};
635
636static __init int sysctl_core_init(void)
637{
638 register_net_sysctl(&init_net, "net/core", net_core_table);
639 return register_pernet_subsys(&sysctl_core_ops);
640}
641
642fs_initcall(sysctl_core_init);