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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
20#include <net/ip.h>
21#include <net/sock.h>
22#include <net/net_ratelimit.h>
23#include <net/busy_poll.h>
24#include <net/pkt_sched.h>
25
26#include "dev.h"
27
28static int int_3600 = 3600;
29static int min_sndbuf = SOCK_MIN_SNDBUF;
30static int min_rcvbuf = SOCK_MIN_RCVBUF;
31static int max_skb_frags = MAX_SKB_FRAGS;
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 kvfree_rcu(orig_sock_table);
105 }
106 }
107 }
108
109 mutex_unlock(&sock_flow_mutex);
110
111 return ret;
112}
113#endif /* CONFIG_RPS */
114
115#ifdef CONFIG_NET_FLOW_LIMIT
116static DEFINE_MUTEX(flow_limit_update_mutex);
117
118static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
119 void *buffer, size_t *lenp, loff_t *ppos)
120{
121 struct sd_flow_limit *cur;
122 struct softnet_data *sd;
123 cpumask_var_t mask;
124 int i, len, ret = 0;
125
126 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
127 return -ENOMEM;
128
129 if (write) {
130 ret = cpumask_parse(buffer, mask);
131 if (ret)
132 goto done;
133
134 mutex_lock(&flow_limit_update_mutex);
135 len = sizeof(*cur) + netdev_flow_limit_table_len;
136 for_each_possible_cpu(i) {
137 sd = &per_cpu(softnet_data, i);
138 cur = rcu_dereference_protected(sd->flow_limit,
139 lockdep_is_held(&flow_limit_update_mutex));
140 if (cur && !cpumask_test_cpu(i, mask)) {
141 RCU_INIT_POINTER(sd->flow_limit, NULL);
142 kfree_rcu(cur);
143 } else if (!cur && cpumask_test_cpu(i, mask)) {
144 cur = kzalloc_node(len, GFP_KERNEL,
145 cpu_to_node(i));
146 if (!cur) {
147 /* not unwinding previous changes */
148 ret = -ENOMEM;
149 goto write_unlock;
150 }
151 cur->num_buckets = netdev_flow_limit_table_len;
152 rcu_assign_pointer(sd->flow_limit, cur);
153 }
154 }
155write_unlock:
156 mutex_unlock(&flow_limit_update_mutex);
157 } else {
158 char kbuf[128];
159
160 if (*ppos || !*lenp) {
161 *lenp = 0;
162 goto done;
163 }
164
165 cpumask_clear(mask);
166 rcu_read_lock();
167 for_each_possible_cpu(i) {
168 sd = &per_cpu(softnet_data, i);
169 if (rcu_dereference(sd->flow_limit))
170 cpumask_set_cpu(i, mask);
171 }
172 rcu_read_unlock();
173
174 len = min(sizeof(kbuf) - 1, *lenp);
175 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
176 if (!len) {
177 *lenp = 0;
178 goto done;
179 }
180 if (len < *lenp)
181 kbuf[len++] = '\n';
182 memcpy(buffer, kbuf, len);
183 *lenp = len;
184 *ppos += len;
185 }
186
187done:
188 free_cpumask_var(mask);
189 return ret;
190}
191
192static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
193 void *buffer, size_t *lenp, loff_t *ppos)
194{
195 unsigned int old, *ptr;
196 int ret;
197
198 mutex_lock(&flow_limit_update_mutex);
199
200 ptr = table->data;
201 old = *ptr;
202 ret = proc_dointvec(table, write, buffer, lenp, ppos);
203 if (!ret && write && !is_power_of_2(*ptr)) {
204 *ptr = old;
205 ret = -EINVAL;
206 }
207
208 mutex_unlock(&flow_limit_update_mutex);
209 return ret;
210}
211#endif /* CONFIG_NET_FLOW_LIMIT */
212
213#ifdef CONFIG_NET_SCHED
214static int set_default_qdisc(struct ctl_table *table, int write,
215 void *buffer, size_t *lenp, loff_t *ppos)
216{
217 char id[IFNAMSIZ];
218 struct ctl_table tbl = {
219 .data = id,
220 .maxlen = IFNAMSIZ,
221 };
222 int ret;
223
224 qdisc_get_default(id, IFNAMSIZ);
225
226 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
227 if (write && ret == 0)
228 ret = qdisc_set_default(id);
229 return ret;
230}
231#endif
232
233static int proc_do_dev_weight(struct ctl_table *table, int write,
234 void *buffer, size_t *lenp, loff_t *ppos)
235{
236 static DEFINE_MUTEX(dev_weight_mutex);
237 int ret, weight;
238
239 mutex_lock(&dev_weight_mutex);
240 ret = proc_dointvec(table, write, buffer, lenp, ppos);
241 if (!ret && write) {
242 weight = READ_ONCE(weight_p);
243 WRITE_ONCE(dev_rx_weight, weight * dev_weight_rx_bias);
244 WRITE_ONCE(dev_tx_weight, weight * dev_weight_tx_bias);
245 }
246 mutex_unlock(&dev_weight_mutex);
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 int min = *(int *)table->extra1;
270 int max = *(int *)table->extra2;
271 struct ctl_table tmp = *table;
272
273 if (write && !capable(CAP_SYS_ADMIN))
274 return -EPERM;
275
276 tmp.data = &jit_enable;
277 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
278 if (write && !ret) {
279 if (jit_enable < 2 ||
280 (jit_enable == 2 && bpf_dump_raw_ok(current_cred()))) {
281 *(int *)table->data = jit_enable;
282 if (jit_enable == 2)
283 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
284 } else {
285 ret = -EPERM;
286 }
287 }
288
289 if (write && ret && min == max)
290 pr_info_once("CONFIG_BPF_JIT_ALWAYS_ON is enabled, bpf_jit_enable is permanently set to 1.\n");
291
292 return ret;
293}
294
295# ifdef CONFIG_HAVE_EBPF_JIT
296static int
297proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
298 void *buffer, size_t *lenp, loff_t *ppos)
299{
300 if (!capable(CAP_SYS_ADMIN))
301 return -EPERM;
302
303 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
304}
305# endif /* CONFIG_HAVE_EBPF_JIT */
306
307static int
308proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,
309 void *buffer, size_t *lenp, loff_t *ppos)
310{
311 if (!capable(CAP_SYS_ADMIN))
312 return -EPERM;
313
314 return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
315}
316#endif
317
318static struct ctl_table net_core_table[] = {
319 {
320 .procname = "wmem_max",
321 .data = &sysctl_wmem_max,
322 .maxlen = sizeof(int),
323 .mode = 0644,
324 .proc_handler = proc_dointvec_minmax,
325 .extra1 = &min_sndbuf,
326 },
327 {
328 .procname = "rmem_max",
329 .data = &sysctl_rmem_max,
330 .maxlen = sizeof(int),
331 .mode = 0644,
332 .proc_handler = proc_dointvec_minmax,
333 .extra1 = &min_rcvbuf,
334 },
335 {
336 .procname = "wmem_default",
337 .data = &sysctl_wmem_default,
338 .maxlen = sizeof(int),
339 .mode = 0644,
340 .proc_handler = proc_dointvec_minmax,
341 .extra1 = &min_sndbuf,
342 },
343 {
344 .procname = "rmem_default",
345 .data = &sysctl_rmem_default,
346 .maxlen = sizeof(int),
347 .mode = 0644,
348 .proc_handler = proc_dointvec_minmax,
349 .extra1 = &min_rcvbuf,
350 },
351 {
352 .procname = "dev_weight",
353 .data = &weight_p,
354 .maxlen = sizeof(int),
355 .mode = 0644,
356 .proc_handler = proc_do_dev_weight,
357 },
358 {
359 .procname = "dev_weight_rx_bias",
360 .data = &dev_weight_rx_bias,
361 .maxlen = sizeof(int),
362 .mode = 0644,
363 .proc_handler = proc_do_dev_weight,
364 },
365 {
366 .procname = "dev_weight_tx_bias",
367 .data = &dev_weight_tx_bias,
368 .maxlen = sizeof(int),
369 .mode = 0644,
370 .proc_handler = proc_do_dev_weight,
371 },
372 {
373 .procname = "netdev_max_backlog",
374 .data = &netdev_max_backlog,
375 .maxlen = sizeof(int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec
378 },
379 {
380 .procname = "netdev_rss_key",
381 .data = &netdev_rss_key,
382 .maxlen = sizeof(int),
383 .mode = 0444,
384 .proc_handler = proc_do_rss_key,
385 },
386#ifdef CONFIG_BPF_JIT
387 {
388 .procname = "bpf_jit_enable",
389 .data = &bpf_jit_enable,
390 .maxlen = sizeof(int),
391 .mode = 0644,
392 .proc_handler = proc_dointvec_minmax_bpf_enable,
393# ifdef CONFIG_BPF_JIT_ALWAYS_ON
394 .extra1 = SYSCTL_ONE,
395 .extra2 = SYSCTL_ONE,
396# else
397 .extra1 = SYSCTL_ZERO,
398 .extra2 = SYSCTL_TWO,
399# endif
400 },
401# ifdef CONFIG_HAVE_EBPF_JIT
402 {
403 .procname = "bpf_jit_harden",
404 .data = &bpf_jit_harden,
405 .maxlen = sizeof(int),
406 .mode = 0600,
407 .proc_handler = proc_dointvec_minmax_bpf_restricted,
408 .extra1 = SYSCTL_ZERO,
409 .extra2 = SYSCTL_TWO,
410 },
411 {
412 .procname = "bpf_jit_kallsyms",
413 .data = &bpf_jit_kallsyms,
414 .maxlen = sizeof(int),
415 .mode = 0600,
416 .proc_handler = proc_dointvec_minmax_bpf_restricted,
417 .extra1 = SYSCTL_ZERO,
418 .extra2 = SYSCTL_ONE,
419 },
420# endif
421 {
422 .procname = "bpf_jit_limit",
423 .data = &bpf_jit_limit,
424 .maxlen = sizeof(long),
425 .mode = 0600,
426 .proc_handler = proc_dolongvec_minmax_bpf_restricted,
427 .extra1 = SYSCTL_LONG_ONE,
428 .extra2 = &bpf_jit_limit_max,
429 },
430#endif
431 {
432 .procname = "netdev_tstamp_prequeue",
433 .data = &netdev_tstamp_prequeue,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = proc_dointvec
437 },
438 {
439 .procname = "message_cost",
440 .data = &net_ratelimit_state.interval,
441 .maxlen = sizeof(int),
442 .mode = 0644,
443 .proc_handler = proc_dointvec_jiffies,
444 },
445 {
446 .procname = "message_burst",
447 .data = &net_ratelimit_state.burst,
448 .maxlen = sizeof(int),
449 .mode = 0644,
450 .proc_handler = proc_dointvec,
451 },
452 {
453 .procname = "optmem_max",
454 .data = &sysctl_optmem_max,
455 .maxlen = sizeof(int),
456 .mode = 0644,
457 .proc_handler = proc_dointvec
458 },
459 {
460 .procname = "tstamp_allow_data",
461 .data = &sysctl_tstamp_allow_data,
462 .maxlen = sizeof(int),
463 .mode = 0644,
464 .proc_handler = proc_dointvec_minmax,
465 .extra1 = SYSCTL_ZERO,
466 .extra2 = SYSCTL_ONE
467 },
468#ifdef CONFIG_RPS
469 {
470 .procname = "rps_sock_flow_entries",
471 .maxlen = sizeof(int),
472 .mode = 0644,
473 .proc_handler = rps_sock_flow_sysctl
474 },
475#endif
476#ifdef CONFIG_NET_FLOW_LIMIT
477 {
478 .procname = "flow_limit_cpu_bitmap",
479 .mode = 0644,
480 .proc_handler = flow_limit_cpu_sysctl
481 },
482 {
483 .procname = "flow_limit_table_len",
484 .data = &netdev_flow_limit_table_len,
485 .maxlen = sizeof(int),
486 .mode = 0644,
487 .proc_handler = flow_limit_table_len_sysctl
488 },
489#endif /* CONFIG_NET_FLOW_LIMIT */
490#ifdef CONFIG_NET_RX_BUSY_POLL
491 {
492 .procname = "busy_poll",
493 .data = &sysctl_net_busy_poll,
494 .maxlen = sizeof(unsigned int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec_minmax,
497 .extra1 = SYSCTL_ZERO,
498 },
499 {
500 .procname = "busy_read",
501 .data = &sysctl_net_busy_read,
502 .maxlen = sizeof(unsigned int),
503 .mode = 0644,
504 .proc_handler = proc_dointvec_minmax,
505 .extra1 = SYSCTL_ZERO,
506 },
507#endif
508#ifdef CONFIG_NET_SCHED
509 {
510 .procname = "default_qdisc",
511 .mode = 0644,
512 .maxlen = IFNAMSIZ,
513 .proc_handler = set_default_qdisc
514 },
515#endif
516 {
517 .procname = "netdev_budget",
518 .data = &netdev_budget,
519 .maxlen = sizeof(int),
520 .mode = 0644,
521 .proc_handler = proc_dointvec
522 },
523 {
524 .procname = "warnings",
525 .data = &net_msg_warn,
526 .maxlen = sizeof(int),
527 .mode = 0644,
528 .proc_handler = proc_dointvec
529 },
530 {
531 .procname = "max_skb_frags",
532 .data = &sysctl_max_skb_frags,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = proc_dointvec_minmax,
536 .extra1 = SYSCTL_ONE,
537 .extra2 = &max_skb_frags,
538 },
539 {
540 .procname = "netdev_budget_usecs",
541 .data = &netdev_budget_usecs,
542 .maxlen = sizeof(unsigned int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec_minmax,
545 .extra1 = SYSCTL_ZERO,
546 },
547 {
548 .procname = "fb_tunnels_only_for_init_net",
549 .data = &sysctl_fb_tunnels_only_for_init_net,
550 .maxlen = sizeof(int),
551 .mode = 0644,
552 .proc_handler = proc_dointvec_minmax,
553 .extra1 = SYSCTL_ZERO,
554 .extra2 = SYSCTL_TWO,
555 },
556 {
557 .procname = "devconf_inherit_init_net",
558 .data = &sysctl_devconf_inherit_init_net,
559 .maxlen = sizeof(int),
560 .mode = 0644,
561 .proc_handler = proc_dointvec_minmax,
562 .extra1 = SYSCTL_ZERO,
563 .extra2 = SYSCTL_THREE,
564 },
565 {
566 .procname = "high_order_alloc_disable",
567 .data = &net_high_order_alloc_disable_key.key,
568 .maxlen = sizeof(net_high_order_alloc_disable_key),
569 .mode = 0644,
570 .proc_handler = proc_do_static_key,
571 },
572 {
573 .procname = "gro_normal_batch",
574 .data = &gro_normal_batch,
575 .maxlen = sizeof(unsigned int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec_minmax,
578 .extra1 = SYSCTL_ONE,
579 },
580 {
581 .procname = "netdev_unregister_timeout_secs",
582 .data = &netdev_unregister_timeout_secs,
583 .maxlen = sizeof(unsigned int),
584 .mode = 0644,
585 .proc_handler = proc_dointvec_minmax,
586 .extra1 = SYSCTL_ONE,
587 .extra2 = &int_3600,
588 },
589 {
590 .procname = "skb_defer_max",
591 .data = &sysctl_skb_defer_max,
592 .maxlen = sizeof(unsigned int),
593 .mode = 0644,
594 .proc_handler = proc_dointvec_minmax,
595 .extra1 = SYSCTL_ZERO,
596 },
597 { }
598};
599
600static struct ctl_table netns_core_table[] = {
601 {
602 .procname = "somaxconn",
603 .data = &init_net.core.sysctl_somaxconn,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .extra1 = SYSCTL_ZERO,
607 .proc_handler = proc_dointvec_minmax
608 },
609 {
610 .procname = "txrehash",
611 .data = &init_net.core.sysctl_txrehash,
612 .maxlen = sizeof(u8),
613 .mode = 0644,
614 .extra1 = SYSCTL_ZERO,
615 .extra2 = SYSCTL_ONE,
616 .proc_handler = proc_dou8vec_minmax,
617 },
618 { }
619};
620
621static int __init fb_tunnels_only_for_init_net_sysctl_setup(char *str)
622{
623 /* fallback tunnels for initns only */
624 if (!strncmp(str, "initns", 6))
625 sysctl_fb_tunnels_only_for_init_net = 1;
626 /* no fallback tunnels anywhere */
627 else if (!strncmp(str, "none", 4))
628 sysctl_fb_tunnels_only_for_init_net = 2;
629
630 return 1;
631}
632__setup("fb_tunnels=", fb_tunnels_only_for_init_net_sysctl_setup);
633
634static __net_init int sysctl_core_net_init(struct net *net)
635{
636 struct ctl_table *tbl, *tmp;
637
638 tbl = netns_core_table;
639 if (!net_eq(net, &init_net)) {
640 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
641 if (tbl == NULL)
642 goto err_dup;
643
644 for (tmp = tbl; tmp->procname; tmp++)
645 tmp->data += (char *)net - (char *)&init_net;
646
647 /* Don't export any sysctls to unprivileged users */
648 if (net->user_ns != &init_user_ns) {
649 tbl[0].procname = NULL;
650 }
651 }
652
653 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
654 if (net->core.sysctl_hdr == NULL)
655 goto err_reg;
656
657 return 0;
658
659err_reg:
660 if (tbl != netns_core_table)
661 kfree(tbl);
662err_dup:
663 return -ENOMEM;
664}
665
666static __net_exit void sysctl_core_net_exit(struct net *net)
667{
668 struct ctl_table *tbl;
669
670 tbl = net->core.sysctl_hdr->ctl_table_arg;
671 unregister_net_sysctl_table(net->core.sysctl_hdr);
672 BUG_ON(tbl == netns_core_table);
673 kfree(tbl);
674}
675
676static __net_initdata struct pernet_operations sysctl_core_ops = {
677 .init = sysctl_core_net_init,
678 .exit = sysctl_core_net_exit,
679};
680
681static __init int sysctl_core_init(void)
682{
683 register_net_sysctl(&init_net, "net/core", net_core_table);
684 return register_pernet_subsys(&sysctl_core_ops);
685}
686
687fs_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 zero = 0;
26static int one = 1;
27static int two __maybe_unused = 2;
28static int min_sndbuf = SOCK_MIN_SNDBUF;
29static int min_rcvbuf = SOCK_MIN_RCVBUF;
30static int max_skb_frags = MAX_SKB_FRAGS;
31
32static int net_msg_warn; /* Unused, but still a sysctl */
33
34int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
35EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
36
37#ifdef CONFIG_RPS
38static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
39 void __user *buffer, size_t *lenp, loff_t *ppos)
40{
41 unsigned int orig_size, size;
42 int ret, i;
43 struct ctl_table tmp = {
44 .data = &size,
45 .maxlen = sizeof(size),
46 .mode = table->mode
47 };
48 struct rps_sock_flow_table *orig_sock_table, *sock_table;
49 static DEFINE_MUTEX(sock_flow_mutex);
50
51 mutex_lock(&sock_flow_mutex);
52
53 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
54 lockdep_is_held(&sock_flow_mutex));
55 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
56
57 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
58
59 if (write) {
60 if (size) {
61 if (size > 1<<29) {
62 /* Enforce limit to prevent overflow */
63 mutex_unlock(&sock_flow_mutex);
64 return -EINVAL;
65 }
66 size = roundup_pow_of_two(size);
67 if (size != orig_size) {
68 sock_table =
69 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
70 if (!sock_table) {
71 mutex_unlock(&sock_flow_mutex);
72 return -ENOMEM;
73 }
74 rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
75 sock_table->mask = size - 1;
76 } else
77 sock_table = orig_sock_table;
78
79 for (i = 0; i < size; i++)
80 sock_table->ents[i] = RPS_NO_CPU;
81 } else
82 sock_table = NULL;
83
84 if (sock_table != orig_sock_table) {
85 rcu_assign_pointer(rps_sock_flow_table, sock_table);
86 if (sock_table) {
87 static_key_slow_inc(&rps_needed);
88 static_key_slow_inc(&rfs_needed);
89 }
90 if (orig_sock_table) {
91 static_key_slow_dec(&rps_needed);
92 static_key_slow_dec(&rfs_needed);
93 synchronize_rcu();
94 vfree(orig_sock_table);
95 }
96 }
97 }
98
99 mutex_unlock(&sock_flow_mutex);
100
101 return ret;
102}
103#endif /* CONFIG_RPS */
104
105#ifdef CONFIG_NET_FLOW_LIMIT
106static DEFINE_MUTEX(flow_limit_update_mutex);
107
108static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
109 void __user *buffer, size_t *lenp,
110 loff_t *ppos)
111{
112 struct sd_flow_limit *cur;
113 struct softnet_data *sd;
114 cpumask_var_t mask;
115 int i, len, ret = 0;
116
117 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
118 return -ENOMEM;
119
120 if (write) {
121 ret = cpumask_parse_user(buffer, *lenp, mask);
122 if (ret)
123 goto done;
124
125 mutex_lock(&flow_limit_update_mutex);
126 len = sizeof(*cur) + netdev_flow_limit_table_len;
127 for_each_possible_cpu(i) {
128 sd = &per_cpu(softnet_data, i);
129 cur = rcu_dereference_protected(sd->flow_limit,
130 lockdep_is_held(&flow_limit_update_mutex));
131 if (cur && !cpumask_test_cpu(i, mask)) {
132 RCU_INIT_POINTER(sd->flow_limit, NULL);
133 synchronize_rcu();
134 kfree(cur);
135 } else if (!cur && cpumask_test_cpu(i, mask)) {
136 cur = kzalloc_node(len, GFP_KERNEL,
137 cpu_to_node(i));
138 if (!cur) {
139 /* not unwinding previous changes */
140 ret = -ENOMEM;
141 goto write_unlock;
142 }
143 cur->num_buckets = netdev_flow_limit_table_len;
144 rcu_assign_pointer(sd->flow_limit, cur);
145 }
146 }
147write_unlock:
148 mutex_unlock(&flow_limit_update_mutex);
149 } else {
150 char kbuf[128];
151
152 if (*ppos || !*lenp) {
153 *lenp = 0;
154 goto done;
155 }
156
157 cpumask_clear(mask);
158 rcu_read_lock();
159 for_each_possible_cpu(i) {
160 sd = &per_cpu(softnet_data, i);
161 if (rcu_dereference(sd->flow_limit))
162 cpumask_set_cpu(i, mask);
163 }
164 rcu_read_unlock();
165
166 len = min(sizeof(kbuf) - 1, *lenp);
167 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
168 if (!len) {
169 *lenp = 0;
170 goto done;
171 }
172 if (len < *lenp)
173 kbuf[len++] = '\n';
174 if (copy_to_user(buffer, kbuf, len)) {
175 ret = -EFAULT;
176 goto done;
177 }
178 *lenp = len;
179 *ppos += len;
180 }
181
182done:
183 free_cpumask_var(mask);
184 return ret;
185}
186
187static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
188 void __user *buffer, size_t *lenp,
189 loff_t *ppos)
190{
191 unsigned int old, *ptr;
192 int ret;
193
194 mutex_lock(&flow_limit_update_mutex);
195
196 ptr = table->data;
197 old = *ptr;
198 ret = proc_dointvec(table, write, buffer, lenp, ppos);
199 if (!ret && write && !is_power_of_2(*ptr)) {
200 *ptr = old;
201 ret = -EINVAL;
202 }
203
204 mutex_unlock(&flow_limit_update_mutex);
205 return ret;
206}
207#endif /* CONFIG_NET_FLOW_LIMIT */
208
209#ifdef CONFIG_NET_SCHED
210static int set_default_qdisc(struct ctl_table *table, int write,
211 void __user *buffer, size_t *lenp, loff_t *ppos)
212{
213 char id[IFNAMSIZ];
214 struct ctl_table tbl = {
215 .data = id,
216 .maxlen = IFNAMSIZ,
217 };
218 int ret;
219
220 qdisc_get_default(id, IFNAMSIZ);
221
222 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
223 if (write && ret == 0)
224 ret = qdisc_set_default(id);
225 return ret;
226}
227#endif
228
229static int proc_do_dev_weight(struct ctl_table *table, int write,
230 void __user *buffer, size_t *lenp, loff_t *ppos)
231{
232 int ret;
233
234 ret = proc_dointvec(table, write, buffer, lenp, ppos);
235 if (ret != 0)
236 return ret;
237
238 dev_rx_weight = weight_p * dev_weight_rx_bias;
239 dev_tx_weight = weight_p * dev_weight_tx_bias;
240
241 return ret;
242}
243
244static int proc_do_rss_key(struct ctl_table *table, int write,
245 void __user *buffer, size_t *lenp, loff_t *ppos)
246{
247 struct ctl_table fake_table;
248 char buf[NETDEV_RSS_KEY_LEN * 3];
249
250 snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
251 fake_table.data = buf;
252 fake_table.maxlen = sizeof(buf);
253 return proc_dostring(&fake_table, write, buffer, lenp, ppos);
254}
255
256#ifdef CONFIG_BPF_JIT
257static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
258 void __user *buffer, size_t *lenp,
259 loff_t *ppos)
260{
261 int ret, jit_enable = *(int *)table->data;
262 struct ctl_table tmp = *table;
263
264 if (write && !capable(CAP_SYS_ADMIN))
265 return -EPERM;
266
267 tmp.data = &jit_enable;
268 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
269 if (write && !ret) {
270 if (jit_enable < 2 ||
271 (jit_enable == 2 && bpf_dump_raw_ok())) {
272 *(int *)table->data = jit_enable;
273 if (jit_enable == 2)
274 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
275 } else {
276 ret = -EPERM;
277 }
278 }
279 return ret;
280}
281
282# ifdef CONFIG_HAVE_EBPF_JIT
283static int
284proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
285 void __user *buffer, size_t *lenp,
286 loff_t *ppos)
287{
288 if (!capable(CAP_SYS_ADMIN))
289 return -EPERM;
290
291 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
292}
293# endif
294#endif
295
296static struct ctl_table net_core_table[] = {
297#ifdef CONFIG_NET
298 {
299 .procname = "wmem_max",
300 .data = &sysctl_wmem_max,
301 .maxlen = sizeof(int),
302 .mode = 0644,
303 .proc_handler = proc_dointvec_minmax,
304 .extra1 = &min_sndbuf,
305 },
306 {
307 .procname = "rmem_max",
308 .data = &sysctl_rmem_max,
309 .maxlen = sizeof(int),
310 .mode = 0644,
311 .proc_handler = proc_dointvec_minmax,
312 .extra1 = &min_rcvbuf,
313 },
314 {
315 .procname = "wmem_default",
316 .data = &sysctl_wmem_default,
317 .maxlen = sizeof(int),
318 .mode = 0644,
319 .proc_handler = proc_dointvec_minmax,
320 .extra1 = &min_sndbuf,
321 },
322 {
323 .procname = "rmem_default",
324 .data = &sysctl_rmem_default,
325 .maxlen = sizeof(int),
326 .mode = 0644,
327 .proc_handler = proc_dointvec_minmax,
328 .extra1 = &min_rcvbuf,
329 },
330 {
331 .procname = "dev_weight",
332 .data = &weight_p,
333 .maxlen = sizeof(int),
334 .mode = 0644,
335 .proc_handler = proc_do_dev_weight,
336 },
337 {
338 .procname = "dev_weight_rx_bias",
339 .data = &dev_weight_rx_bias,
340 .maxlen = sizeof(int),
341 .mode = 0644,
342 .proc_handler = proc_do_dev_weight,
343 },
344 {
345 .procname = "dev_weight_tx_bias",
346 .data = &dev_weight_tx_bias,
347 .maxlen = sizeof(int),
348 .mode = 0644,
349 .proc_handler = proc_do_dev_weight,
350 },
351 {
352 .procname = "netdev_max_backlog",
353 .data = &netdev_max_backlog,
354 .maxlen = sizeof(int),
355 .mode = 0644,
356 .proc_handler = proc_dointvec
357 },
358 {
359 .procname = "netdev_rss_key",
360 .data = &netdev_rss_key,
361 .maxlen = sizeof(int),
362 .mode = 0444,
363 .proc_handler = proc_do_rss_key,
364 },
365#ifdef CONFIG_BPF_JIT
366 {
367 .procname = "bpf_jit_enable",
368 .data = &bpf_jit_enable,
369 .maxlen = sizeof(int),
370 .mode = 0644,
371 .proc_handler = proc_dointvec_minmax_bpf_enable,
372# ifdef CONFIG_BPF_JIT_ALWAYS_ON
373 .extra1 = &one,
374 .extra2 = &one,
375# else
376 .extra1 = &zero,
377 .extra2 = &two,
378# endif
379 },
380# ifdef CONFIG_HAVE_EBPF_JIT
381 {
382 .procname = "bpf_jit_harden",
383 .data = &bpf_jit_harden,
384 .maxlen = sizeof(int),
385 .mode = 0600,
386 .proc_handler = proc_dointvec_minmax_bpf_restricted,
387 .extra1 = &zero,
388 .extra2 = &two,
389 },
390 {
391 .procname = "bpf_jit_kallsyms",
392 .data = &bpf_jit_kallsyms,
393 .maxlen = sizeof(int),
394 .mode = 0600,
395 .proc_handler = proc_dointvec_minmax_bpf_restricted,
396 .extra1 = &zero,
397 .extra2 = &one,
398 },
399# endif
400#endif
401 {
402 .procname = "netdev_tstamp_prequeue",
403 .data = &netdev_tstamp_prequeue,
404 .maxlen = sizeof(int),
405 .mode = 0644,
406 .proc_handler = proc_dointvec
407 },
408 {
409 .procname = "message_cost",
410 .data = &net_ratelimit_state.interval,
411 .maxlen = sizeof(int),
412 .mode = 0644,
413 .proc_handler = proc_dointvec_jiffies,
414 },
415 {
416 .procname = "message_burst",
417 .data = &net_ratelimit_state.burst,
418 .maxlen = sizeof(int),
419 .mode = 0644,
420 .proc_handler = proc_dointvec,
421 },
422 {
423 .procname = "optmem_max",
424 .data = &sysctl_optmem_max,
425 .maxlen = sizeof(int),
426 .mode = 0644,
427 .proc_handler = proc_dointvec
428 },
429 {
430 .procname = "tstamp_allow_data",
431 .data = &sysctl_tstamp_allow_data,
432 .maxlen = sizeof(int),
433 .mode = 0644,
434 .proc_handler = proc_dointvec_minmax,
435 .extra1 = &zero,
436 .extra2 = &one
437 },
438#ifdef CONFIG_RPS
439 {
440 .procname = "rps_sock_flow_entries",
441 .maxlen = sizeof(int),
442 .mode = 0644,
443 .proc_handler = rps_sock_flow_sysctl
444 },
445#endif
446#ifdef CONFIG_NET_FLOW_LIMIT
447 {
448 .procname = "flow_limit_cpu_bitmap",
449 .mode = 0644,
450 .proc_handler = flow_limit_cpu_sysctl
451 },
452 {
453 .procname = "flow_limit_table_len",
454 .data = &netdev_flow_limit_table_len,
455 .maxlen = sizeof(int),
456 .mode = 0644,
457 .proc_handler = flow_limit_table_len_sysctl
458 },
459#endif /* CONFIG_NET_FLOW_LIMIT */
460#ifdef CONFIG_NET_RX_BUSY_POLL
461 {
462 .procname = "busy_poll",
463 .data = &sysctl_net_busy_poll,
464 .maxlen = sizeof(unsigned int),
465 .mode = 0644,
466 .proc_handler = proc_dointvec_minmax,
467 .extra1 = &zero,
468 },
469 {
470 .procname = "busy_read",
471 .data = &sysctl_net_busy_read,
472 .maxlen = sizeof(unsigned int),
473 .mode = 0644,
474 .proc_handler = proc_dointvec_minmax,
475 .extra1 = &zero,
476 },
477#endif
478#ifdef CONFIG_NET_SCHED
479 {
480 .procname = "default_qdisc",
481 .mode = 0644,
482 .maxlen = IFNAMSIZ,
483 .proc_handler = set_default_qdisc
484 },
485#endif
486#endif /* CONFIG_NET */
487 {
488 .procname = "netdev_budget",
489 .data = &netdev_budget,
490 .maxlen = sizeof(int),
491 .mode = 0644,
492 .proc_handler = proc_dointvec
493 },
494 {
495 .procname = "warnings",
496 .data = &net_msg_warn,
497 .maxlen = sizeof(int),
498 .mode = 0644,
499 .proc_handler = proc_dointvec
500 },
501 {
502 .procname = "max_skb_frags",
503 .data = &sysctl_max_skb_frags,
504 .maxlen = sizeof(int),
505 .mode = 0644,
506 .proc_handler = proc_dointvec_minmax,
507 .extra1 = &one,
508 .extra2 = &max_skb_frags,
509 },
510 {
511 .procname = "netdev_budget_usecs",
512 .data = &netdev_budget_usecs,
513 .maxlen = sizeof(unsigned int),
514 .mode = 0644,
515 .proc_handler = proc_dointvec_minmax,
516 .extra1 = &zero,
517 },
518 {
519 .procname = "fb_tunnels_only_for_init_net",
520 .data = &sysctl_fb_tunnels_only_for_init_net,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = proc_dointvec_minmax,
524 .extra1 = &zero,
525 .extra2 = &one,
526 },
527 { }
528};
529
530static struct ctl_table netns_core_table[] = {
531 {
532 .procname = "somaxconn",
533 .data = &init_net.core.sysctl_somaxconn,
534 .maxlen = sizeof(int),
535 .mode = 0644,
536 .extra1 = &zero,
537 .proc_handler = proc_dointvec_minmax
538 },
539 { }
540};
541
542static __net_init int sysctl_core_net_init(struct net *net)
543{
544 struct ctl_table *tbl;
545
546 tbl = netns_core_table;
547 if (!net_eq(net, &init_net)) {
548 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
549 if (tbl == NULL)
550 goto err_dup;
551
552 tbl[0].data = &net->core.sysctl_somaxconn;
553
554 /* Don't export any sysctls to unprivileged users */
555 if (net->user_ns != &init_user_ns) {
556 tbl[0].procname = NULL;
557 }
558 }
559
560 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
561 if (net->core.sysctl_hdr == NULL)
562 goto err_reg;
563
564 return 0;
565
566err_reg:
567 if (tbl != netns_core_table)
568 kfree(tbl);
569err_dup:
570 return -ENOMEM;
571}
572
573static __net_exit void sysctl_core_net_exit(struct net *net)
574{
575 struct ctl_table *tbl;
576
577 tbl = net->core.sysctl_hdr->ctl_table_arg;
578 unregister_net_sysctl_table(net->core.sysctl_hdr);
579 BUG_ON(tbl == netns_core_table);
580 kfree(tbl);
581}
582
583static __net_initdata struct pernet_operations sysctl_core_ops = {
584 .init = sysctl_core_net_init,
585 .exit = sysctl_core_net_exit,
586};
587
588static __init int sysctl_core_init(void)
589{
590 register_net_sysctl(&init_net, "net/core", net_core_table);
591 return register_pernet_subsys(&sysctl_core_ops);
592}
593
594fs_initcall(sysctl_core_init);