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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/filter.h>
10#include <linux/mm.h>
11#include <linux/sysctl.h>
12#include <linux/module.h>
13#include <linux/socket.h>
14#include <linux/netdevice.h>
15#include <linux/ratelimit.h>
16#include <linux/vmalloc.h>
17#include <linux/init.h>
18#include <linux/slab.h>
19#include <linux/sched/isolation.h>
20
21#include <net/ip.h>
22#include <net/sock.h>
23#include <net/net_ratelimit.h>
24#include <net/busy_poll.h>
25#include <net/pkt_sched.h>
26
27#include "dev.h"
28
29static int int_3600 = 3600;
30static int min_sndbuf = SOCK_MIN_SNDBUF;
31static int min_rcvbuf = SOCK_MIN_RCVBUF;
32static int max_skb_frags = MAX_SKB_FRAGS;
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#if IS_ENABLED(CONFIG_NET_FLOW_LIMIT) || IS_ENABLED(CONFIG_RPS)
50static void dump_cpumask(void *buffer, size_t *lenp, loff_t *ppos,
51 struct cpumask *mask)
52{
53 char kbuf[128];
54 int len;
55
56 if (*ppos || !*lenp) {
57 *lenp = 0;
58 return;
59 }
60
61 len = min(sizeof(kbuf) - 1, *lenp);
62 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
63 if (!len) {
64 *lenp = 0;
65 return;
66 }
67
68 if (len < *lenp)
69 kbuf[len++] = '\n';
70 memcpy(buffer, kbuf, len);
71 *lenp = len;
72 *ppos += len;
73}
74#endif
75
76#ifdef CONFIG_RPS
77
78static struct cpumask *rps_default_mask_cow_alloc(struct net *net)
79{
80 struct cpumask *rps_default_mask;
81
82 if (net->core.rps_default_mask)
83 return net->core.rps_default_mask;
84
85 rps_default_mask = kzalloc(cpumask_size(), GFP_KERNEL);
86 if (!rps_default_mask)
87 return NULL;
88
89 /* pairs with READ_ONCE in rx_queue_default_mask() */
90 WRITE_ONCE(net->core.rps_default_mask, rps_default_mask);
91 return rps_default_mask;
92}
93
94static int rps_default_mask_sysctl(struct ctl_table *table, int write,
95 void *buffer, size_t *lenp, loff_t *ppos)
96{
97 struct net *net = (struct net *)table->data;
98 int err = 0;
99
100 rtnl_lock();
101 if (write) {
102 struct cpumask *rps_default_mask = rps_default_mask_cow_alloc(net);
103
104 err = -ENOMEM;
105 if (!rps_default_mask)
106 goto done;
107
108 err = cpumask_parse(buffer, rps_default_mask);
109 if (err)
110 goto done;
111
112 err = rps_cpumask_housekeeping(rps_default_mask);
113 if (err)
114 goto done;
115 } else {
116 dump_cpumask(buffer, lenp, ppos,
117 net->core.rps_default_mask ? : cpu_none_mask);
118 }
119
120done:
121 rtnl_unlock();
122 return err;
123}
124
125static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
126 void *buffer, size_t *lenp, loff_t *ppos)
127{
128 unsigned int orig_size, size;
129 int ret, i;
130 struct ctl_table tmp = {
131 .data = &size,
132 .maxlen = sizeof(size),
133 .mode = table->mode
134 };
135 struct rps_sock_flow_table *orig_sock_table, *sock_table;
136 static DEFINE_MUTEX(sock_flow_mutex);
137
138 mutex_lock(&sock_flow_mutex);
139
140 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
141 lockdep_is_held(&sock_flow_mutex));
142 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
143
144 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
145
146 if (write) {
147 if (size) {
148 if (size > 1<<29) {
149 /* Enforce limit to prevent overflow */
150 mutex_unlock(&sock_flow_mutex);
151 return -EINVAL;
152 }
153 size = roundup_pow_of_two(size);
154 if (size != orig_size) {
155 sock_table =
156 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
157 if (!sock_table) {
158 mutex_unlock(&sock_flow_mutex);
159 return -ENOMEM;
160 }
161 rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
162 sock_table->mask = size - 1;
163 } else
164 sock_table = orig_sock_table;
165
166 for (i = 0; i < size; i++)
167 sock_table->ents[i] = RPS_NO_CPU;
168 } else
169 sock_table = NULL;
170
171 if (sock_table != orig_sock_table) {
172 rcu_assign_pointer(rps_sock_flow_table, sock_table);
173 if (sock_table) {
174 static_branch_inc(&rps_needed);
175 static_branch_inc(&rfs_needed);
176 }
177 if (orig_sock_table) {
178 static_branch_dec(&rps_needed);
179 static_branch_dec(&rfs_needed);
180 kvfree_rcu_mightsleep(orig_sock_table);
181 }
182 }
183 }
184
185 mutex_unlock(&sock_flow_mutex);
186
187 return ret;
188}
189#endif /* CONFIG_RPS */
190
191#ifdef CONFIG_NET_FLOW_LIMIT
192static DEFINE_MUTEX(flow_limit_update_mutex);
193
194static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
195 void *buffer, size_t *lenp, loff_t *ppos)
196{
197 struct sd_flow_limit *cur;
198 struct softnet_data *sd;
199 cpumask_var_t mask;
200 int i, len, ret = 0;
201
202 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
203 return -ENOMEM;
204
205 if (write) {
206 ret = cpumask_parse(buffer, mask);
207 if (ret)
208 goto done;
209
210 mutex_lock(&flow_limit_update_mutex);
211 len = sizeof(*cur) + netdev_flow_limit_table_len;
212 for_each_possible_cpu(i) {
213 sd = &per_cpu(softnet_data, i);
214 cur = rcu_dereference_protected(sd->flow_limit,
215 lockdep_is_held(&flow_limit_update_mutex));
216 if (cur && !cpumask_test_cpu(i, mask)) {
217 RCU_INIT_POINTER(sd->flow_limit, NULL);
218 kfree_rcu_mightsleep(cur);
219 } else if (!cur && cpumask_test_cpu(i, mask)) {
220 cur = kzalloc_node(len, GFP_KERNEL,
221 cpu_to_node(i));
222 if (!cur) {
223 /* not unwinding previous changes */
224 ret = -ENOMEM;
225 goto write_unlock;
226 }
227 cur->num_buckets = netdev_flow_limit_table_len;
228 rcu_assign_pointer(sd->flow_limit, cur);
229 }
230 }
231write_unlock:
232 mutex_unlock(&flow_limit_update_mutex);
233 } else {
234 cpumask_clear(mask);
235 rcu_read_lock();
236 for_each_possible_cpu(i) {
237 sd = &per_cpu(softnet_data, i);
238 if (rcu_dereference(sd->flow_limit))
239 cpumask_set_cpu(i, mask);
240 }
241 rcu_read_unlock();
242
243 dump_cpumask(buffer, lenp, ppos, mask);
244 }
245
246done:
247 free_cpumask_var(mask);
248 return ret;
249}
250
251static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
252 void *buffer, size_t *lenp, loff_t *ppos)
253{
254 unsigned int old, *ptr;
255 int ret;
256
257 mutex_lock(&flow_limit_update_mutex);
258
259 ptr = table->data;
260 old = *ptr;
261 ret = proc_dointvec(table, write, buffer, lenp, ppos);
262 if (!ret && write && !is_power_of_2(*ptr)) {
263 *ptr = old;
264 ret = -EINVAL;
265 }
266
267 mutex_unlock(&flow_limit_update_mutex);
268 return ret;
269}
270#endif /* CONFIG_NET_FLOW_LIMIT */
271
272#ifdef CONFIG_NET_SCHED
273static int set_default_qdisc(struct ctl_table *table, int write,
274 void *buffer, size_t *lenp, loff_t *ppos)
275{
276 char id[IFNAMSIZ];
277 struct ctl_table tbl = {
278 .data = id,
279 .maxlen = IFNAMSIZ,
280 };
281 int ret;
282
283 qdisc_get_default(id, IFNAMSIZ);
284
285 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
286 if (write && ret == 0)
287 ret = qdisc_set_default(id);
288 return ret;
289}
290#endif
291
292static int proc_do_dev_weight(struct ctl_table *table, int write,
293 void *buffer, size_t *lenp, loff_t *ppos)
294{
295 static DEFINE_MUTEX(dev_weight_mutex);
296 int ret, weight;
297
298 mutex_lock(&dev_weight_mutex);
299 ret = proc_dointvec(table, write, buffer, lenp, ppos);
300 if (!ret && write) {
301 weight = READ_ONCE(weight_p);
302 WRITE_ONCE(dev_rx_weight, weight * dev_weight_rx_bias);
303 WRITE_ONCE(dev_tx_weight, weight * dev_weight_tx_bias);
304 }
305 mutex_unlock(&dev_weight_mutex);
306
307 return ret;
308}
309
310static int proc_do_rss_key(struct ctl_table *table, int write,
311 void *buffer, size_t *lenp, loff_t *ppos)
312{
313 struct ctl_table fake_table;
314 char buf[NETDEV_RSS_KEY_LEN * 3];
315
316 snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
317 fake_table.data = buf;
318 fake_table.maxlen = sizeof(buf);
319 return proc_dostring(&fake_table, write, buffer, lenp, ppos);
320}
321
322#ifdef CONFIG_BPF_JIT
323static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
324 void *buffer, size_t *lenp,
325 loff_t *ppos)
326{
327 int ret, jit_enable = *(int *)table->data;
328 int min = *(int *)table->extra1;
329 int max = *(int *)table->extra2;
330 struct ctl_table tmp = *table;
331
332 if (write && !capable(CAP_SYS_ADMIN))
333 return -EPERM;
334
335 tmp.data = &jit_enable;
336 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
337 if (write && !ret) {
338 if (jit_enable < 2 ||
339 (jit_enable == 2 && bpf_dump_raw_ok(current_cred()))) {
340 *(int *)table->data = jit_enable;
341 if (jit_enable == 2)
342 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
343 } else {
344 ret = -EPERM;
345 }
346 }
347
348 if (write && ret && min == max)
349 pr_info_once("CONFIG_BPF_JIT_ALWAYS_ON is enabled, bpf_jit_enable is permanently set to 1.\n");
350
351 return ret;
352}
353
354# ifdef CONFIG_HAVE_EBPF_JIT
355static int
356proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
357 void *buffer, size_t *lenp, loff_t *ppos)
358{
359 if (!capable(CAP_SYS_ADMIN))
360 return -EPERM;
361
362 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
363}
364# endif /* CONFIG_HAVE_EBPF_JIT */
365
366static int
367proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,
368 void *buffer, size_t *lenp, loff_t *ppos)
369{
370 if (!capable(CAP_SYS_ADMIN))
371 return -EPERM;
372
373 return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
374}
375#endif
376
377static struct ctl_table net_core_table[] = {
378 {
379 .procname = "wmem_max",
380 .data = &sysctl_wmem_max,
381 .maxlen = sizeof(int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec_minmax,
384 .extra1 = &min_sndbuf,
385 },
386 {
387 .procname = "rmem_max",
388 .data = &sysctl_rmem_max,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec_minmax,
392 .extra1 = &min_rcvbuf,
393 },
394 {
395 .procname = "wmem_default",
396 .data = &sysctl_wmem_default,
397 .maxlen = sizeof(int),
398 .mode = 0644,
399 .proc_handler = proc_dointvec_minmax,
400 .extra1 = &min_sndbuf,
401 },
402 {
403 .procname = "rmem_default",
404 .data = &sysctl_rmem_default,
405 .maxlen = sizeof(int),
406 .mode = 0644,
407 .proc_handler = proc_dointvec_minmax,
408 .extra1 = &min_rcvbuf,
409 },
410 {
411 .procname = "dev_weight",
412 .data = &weight_p,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = proc_do_dev_weight,
416 },
417 {
418 .procname = "dev_weight_rx_bias",
419 .data = &dev_weight_rx_bias,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = proc_do_dev_weight,
423 },
424 {
425 .procname = "dev_weight_tx_bias",
426 .data = &dev_weight_tx_bias,
427 .maxlen = sizeof(int),
428 .mode = 0644,
429 .proc_handler = proc_do_dev_weight,
430 },
431 {
432 .procname = "netdev_max_backlog",
433 .data = &netdev_max_backlog,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = proc_dointvec
437 },
438 {
439 .procname = "netdev_rss_key",
440 .data = &netdev_rss_key,
441 .maxlen = sizeof(int),
442 .mode = 0444,
443 .proc_handler = proc_do_rss_key,
444 },
445#ifdef CONFIG_BPF_JIT
446 {
447 .procname = "bpf_jit_enable",
448 .data = &bpf_jit_enable,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec_minmax_bpf_enable,
452# ifdef CONFIG_BPF_JIT_ALWAYS_ON
453 .extra1 = SYSCTL_ONE,
454 .extra2 = SYSCTL_ONE,
455# else
456 .extra1 = SYSCTL_ZERO,
457 .extra2 = SYSCTL_TWO,
458# endif
459 },
460# ifdef CONFIG_HAVE_EBPF_JIT
461 {
462 .procname = "bpf_jit_harden",
463 .data = &bpf_jit_harden,
464 .maxlen = sizeof(int),
465 .mode = 0600,
466 .proc_handler = proc_dointvec_minmax_bpf_restricted,
467 .extra1 = SYSCTL_ZERO,
468 .extra2 = SYSCTL_TWO,
469 },
470 {
471 .procname = "bpf_jit_kallsyms",
472 .data = &bpf_jit_kallsyms,
473 .maxlen = sizeof(int),
474 .mode = 0600,
475 .proc_handler = proc_dointvec_minmax_bpf_restricted,
476 .extra1 = SYSCTL_ZERO,
477 .extra2 = SYSCTL_ONE,
478 },
479# endif
480 {
481 .procname = "bpf_jit_limit",
482 .data = &bpf_jit_limit,
483 .maxlen = sizeof(long),
484 .mode = 0600,
485 .proc_handler = proc_dolongvec_minmax_bpf_restricted,
486 .extra1 = SYSCTL_LONG_ONE,
487 .extra2 = &bpf_jit_limit_max,
488 },
489#endif
490 {
491 .procname = "netdev_tstamp_prequeue",
492 .data = &netdev_tstamp_prequeue,
493 .maxlen = sizeof(int),
494 .mode = 0644,
495 .proc_handler = proc_dointvec
496 },
497 {
498 .procname = "message_cost",
499 .data = &net_ratelimit_state.interval,
500 .maxlen = sizeof(int),
501 .mode = 0644,
502 .proc_handler = proc_dointvec_jiffies,
503 },
504 {
505 .procname = "message_burst",
506 .data = &net_ratelimit_state.burst,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec,
510 },
511 {
512 .procname = "tstamp_allow_data",
513 .data = &sysctl_tstamp_allow_data,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec_minmax,
517 .extra1 = SYSCTL_ZERO,
518 .extra2 = SYSCTL_ONE
519 },
520#ifdef CONFIG_RPS
521 {
522 .procname = "rps_sock_flow_entries",
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = rps_sock_flow_sysctl
526 },
527#endif
528#ifdef CONFIG_NET_FLOW_LIMIT
529 {
530 .procname = "flow_limit_cpu_bitmap",
531 .mode = 0644,
532 .proc_handler = flow_limit_cpu_sysctl
533 },
534 {
535 .procname = "flow_limit_table_len",
536 .data = &netdev_flow_limit_table_len,
537 .maxlen = sizeof(int),
538 .mode = 0644,
539 .proc_handler = flow_limit_table_len_sysctl
540 },
541#endif /* CONFIG_NET_FLOW_LIMIT */
542#ifdef CONFIG_NET_RX_BUSY_POLL
543 {
544 .procname = "busy_poll",
545 .data = &sysctl_net_busy_poll,
546 .maxlen = sizeof(unsigned int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec_minmax,
549 .extra1 = SYSCTL_ZERO,
550 },
551 {
552 .procname = "busy_read",
553 .data = &sysctl_net_busy_read,
554 .maxlen = sizeof(unsigned int),
555 .mode = 0644,
556 .proc_handler = proc_dointvec_minmax,
557 .extra1 = SYSCTL_ZERO,
558 },
559#endif
560#ifdef CONFIG_NET_SCHED
561 {
562 .procname = "default_qdisc",
563 .mode = 0644,
564 .maxlen = IFNAMSIZ,
565 .proc_handler = set_default_qdisc
566 },
567#endif
568 {
569 .procname = "netdev_budget",
570 .data = &netdev_budget,
571 .maxlen = sizeof(int),
572 .mode = 0644,
573 .proc_handler = proc_dointvec
574 },
575 {
576 .procname = "warnings",
577 .data = &net_msg_warn,
578 .maxlen = sizeof(int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec
581 },
582 {
583 .procname = "max_skb_frags",
584 .data = &sysctl_max_skb_frags,
585 .maxlen = sizeof(int),
586 .mode = 0644,
587 .proc_handler = proc_dointvec_minmax,
588 .extra1 = SYSCTL_ONE,
589 .extra2 = &max_skb_frags,
590 },
591 {
592 .procname = "netdev_budget_usecs",
593 .data = &netdev_budget_usecs,
594 .maxlen = sizeof(unsigned int),
595 .mode = 0644,
596 .proc_handler = proc_dointvec_minmax,
597 .extra1 = SYSCTL_ZERO,
598 },
599 {
600 .procname = "fb_tunnels_only_for_init_net",
601 .data = &sysctl_fb_tunnels_only_for_init_net,
602 .maxlen = sizeof(int),
603 .mode = 0644,
604 .proc_handler = proc_dointvec_minmax,
605 .extra1 = SYSCTL_ZERO,
606 .extra2 = SYSCTL_TWO,
607 },
608 {
609 .procname = "devconf_inherit_init_net",
610 .data = &sysctl_devconf_inherit_init_net,
611 .maxlen = sizeof(int),
612 .mode = 0644,
613 .proc_handler = proc_dointvec_minmax,
614 .extra1 = SYSCTL_ZERO,
615 .extra2 = SYSCTL_THREE,
616 },
617 {
618 .procname = "high_order_alloc_disable",
619 .data = &net_high_order_alloc_disable_key.key,
620 .maxlen = sizeof(net_high_order_alloc_disable_key),
621 .mode = 0644,
622 .proc_handler = proc_do_static_key,
623 },
624 {
625 .procname = "gro_normal_batch",
626 .data = &gro_normal_batch,
627 .maxlen = sizeof(unsigned int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec_minmax,
630 .extra1 = SYSCTL_ONE,
631 },
632 {
633 .procname = "netdev_unregister_timeout_secs",
634 .data = &netdev_unregister_timeout_secs,
635 .maxlen = sizeof(unsigned int),
636 .mode = 0644,
637 .proc_handler = proc_dointvec_minmax,
638 .extra1 = SYSCTL_ONE,
639 .extra2 = &int_3600,
640 },
641 {
642 .procname = "skb_defer_max",
643 .data = &sysctl_skb_defer_max,
644 .maxlen = sizeof(unsigned int),
645 .mode = 0644,
646 .proc_handler = proc_dointvec_minmax,
647 .extra1 = SYSCTL_ZERO,
648 },
649 { }
650};
651
652static struct ctl_table netns_core_table[] = {
653#if IS_ENABLED(CONFIG_RPS)
654 {
655 .procname = "rps_default_mask",
656 .data = &init_net,
657 .mode = 0644,
658 .proc_handler = rps_default_mask_sysctl
659 },
660#endif
661 {
662 .procname = "somaxconn",
663 .data = &init_net.core.sysctl_somaxconn,
664 .maxlen = sizeof(int),
665 .mode = 0644,
666 .extra1 = SYSCTL_ZERO,
667 .proc_handler = proc_dointvec_minmax
668 },
669 {
670 .procname = "optmem_max",
671 .data = &init_net.core.sysctl_optmem_max,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .extra1 = SYSCTL_ZERO,
675 .proc_handler = proc_dointvec_minmax
676 },
677 {
678 .procname = "txrehash",
679 .data = &init_net.core.sysctl_txrehash,
680 .maxlen = sizeof(u8),
681 .mode = 0644,
682 .extra1 = SYSCTL_ZERO,
683 .extra2 = SYSCTL_ONE,
684 .proc_handler = proc_dou8vec_minmax,
685 },
686 { }
687};
688
689static int __init fb_tunnels_only_for_init_net_sysctl_setup(char *str)
690{
691 /* fallback tunnels for initns only */
692 if (!strncmp(str, "initns", 6))
693 sysctl_fb_tunnels_only_for_init_net = 1;
694 /* no fallback tunnels anywhere */
695 else if (!strncmp(str, "none", 4))
696 sysctl_fb_tunnels_only_for_init_net = 2;
697
698 return 1;
699}
700__setup("fb_tunnels=", fb_tunnels_only_for_init_net_sysctl_setup);
701
702static __net_init int sysctl_core_net_init(struct net *net)
703{
704 struct ctl_table *tbl, *tmp;
705
706 tbl = netns_core_table;
707 if (!net_eq(net, &init_net)) {
708 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
709 if (tbl == NULL)
710 goto err_dup;
711
712 for (tmp = tbl; tmp->procname; tmp++)
713 tmp->data += (char *)net - (char *)&init_net;
714 }
715
716 net->core.sysctl_hdr = register_net_sysctl_sz(net, "net/core", tbl,
717 ARRAY_SIZE(netns_core_table));
718 if (net->core.sysctl_hdr == NULL)
719 goto err_reg;
720
721 return 0;
722
723err_reg:
724 if (tbl != netns_core_table)
725 kfree(tbl);
726err_dup:
727 return -ENOMEM;
728}
729
730static __net_exit void sysctl_core_net_exit(struct net *net)
731{
732 struct ctl_table *tbl;
733
734 tbl = net->core.sysctl_hdr->ctl_table_arg;
735 unregister_net_sysctl_table(net->core.sysctl_hdr);
736 BUG_ON(tbl == netns_core_table);
737#if IS_ENABLED(CONFIG_RPS)
738 kfree(net->core.rps_default_mask);
739#endif
740 kfree(tbl);
741}
742
743static __net_initdata struct pernet_operations sysctl_core_ops = {
744 .init = sysctl_core_net_init,
745 .exit = sysctl_core_net_exit,
746};
747
748static __init int sysctl_core_init(void)
749{
750 register_net_sysctl(&init_net, "net/core", net_core_table);
751 return register_pernet_subsys(&sysctl_core_ops);
752}
753
754fs_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 = 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);