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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#include <linux/hex.h>
21
22#include <net/ip.h>
23#include <net/sock.h>
24#include <net/net_ratelimit.h>
25#include <net/busy_poll.h>
26#include <net/pkt_sched.h>
27#include <net/hotdata.h>
28#include <net/proto_memory.h>
29#include <net/rps.h>
30
31#include "dev.h"
32#include "net-sysfs.h"
33
34static int int_3600 = 3600;
35static int min_sndbuf = SOCK_MIN_SNDBUF;
36static int min_rcvbuf = SOCK_MIN_RCVBUF;
37static int max_skb_frags = MAX_SKB_FRAGS;
38static int min_mem_pcpu_rsv = SK_MEMORY_PCPU_RESERVE;
39static int netdev_budget_usecs_min = 2 * USEC_PER_SEC / HZ;
40
41static int net_msg_warn; /* Unused, but still a sysctl */
42
43int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
44EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
45
46/* 0 - Keep current behavior:
47 * IPv4: inherit all current settings from init_net
48 * IPv6: reset all settings to default
49 * 1 - Both inherit all current settings from init_net
50 * 2 - Both reset all settings to default
51 * 3 - Both inherit all settings from current netns
52 */
53int sysctl_devconf_inherit_init_net __read_mostly;
54EXPORT_SYMBOL(sysctl_devconf_inherit_init_net);
55
56#if IS_ENABLED(CONFIG_NET_FLOW_LIMIT) || IS_ENABLED(CONFIG_RPS)
57static int dump_cpumask(void *buffer, size_t *lenp, loff_t *ppos,
58 struct cpumask *mask)
59{
60 char *kbuf;
61 int len;
62
63 if (*ppos || !*lenp) {
64 *lenp = 0;
65 return 0;
66 }
67
68 /* CPUs are displayed as a hex bitmap + a comma between each groups of 8
69 * nibbles (except the last one which has a newline instead).
70 * Guesstimate the buffer size at the group granularity level.
71 */
72 len = min(DIV_ROUND_UP(nr_cpumask_bits, 32) * (8 + 1), *lenp);
73 kbuf = kmalloc(len, GFP_KERNEL);
74 if (!kbuf) {
75 *lenp = 0;
76 return -ENOMEM;
77 }
78
79 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
80 if (!len) {
81 *lenp = 0;
82 goto free_buf;
83 }
84
85 /* scnprintf writes a trailing null char not counted in the returned
86 * length, override it with a newline.
87 */
88 kbuf[len++] = '\n';
89 memcpy(buffer, kbuf, len);
90 *lenp = len;
91 *ppos += len;
92
93free_buf:
94 kfree(kbuf);
95 return 0;
96}
97#endif
98
99#ifdef CONFIG_RPS
100
101DEFINE_MUTEX(rps_default_mask_mutex);
102
103static int rps_default_mask_sysctl(const struct ctl_table *table, int write,
104 void *buffer, size_t *lenp, loff_t *ppos)
105{
106 struct net *net = (struct net *)table->data;
107 struct cpumask *mask;
108 int err = 0;
109
110 mutex_lock(&rps_default_mask_mutex);
111 mask = net->core.rps_default_mask;
112 if (write) {
113 if (!mask) {
114 mask = kzalloc(cpumask_size(), GFP_KERNEL);
115 net->core.rps_default_mask = mask;
116 }
117 err = -ENOMEM;
118 if (!mask)
119 goto done;
120
121 err = cpumask_parse(buffer, mask);
122 if (err)
123 goto done;
124
125 err = rps_cpumask_housekeeping(mask);
126 if (err)
127 goto done;
128 } else {
129 err = dump_cpumask(buffer, lenp, ppos,
130 mask ?: cpu_none_mask);
131 }
132
133done:
134 mutex_unlock(&rps_default_mask_mutex);
135 return err;
136}
137
138static int rps_sock_flow_sysctl(const struct ctl_table *table, int write,
139 void *buffer, size_t *lenp, loff_t *ppos)
140{
141 struct rps_sock_flow_table *o_sock_table, *sock_table;
142 static DEFINE_MUTEX(sock_flow_mutex);
143 rps_tag_ptr o_tag_ptr, tag_ptr;
144 unsigned int orig_size, size;
145 struct ctl_table tmp = {
146 .data = &size,
147 .maxlen = sizeof(size),
148 .mode = table->mode
149 };
150 void *tofree = NULL;
151 int ret, i;
152 u8 log;
153
154 mutex_lock(&sock_flow_mutex);
155
156 o_tag_ptr = tag_ptr = net_hotdata.rps_sock_flow_table;
157
158 size = o_tag_ptr ? rps_tag_to_mask(o_tag_ptr) + 1 : 0;
159 o_sock_table = rps_tag_to_table(o_tag_ptr);
160 orig_size = size;
161
162 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
163
164 if (!write)
165 goto unlock;
166
167 if (size) {
168 if (size > 1<<29) {
169 /* Enforce limit to prevent overflow */
170 mutex_unlock(&sock_flow_mutex);
171 return -EINVAL;
172 }
173 sock_table = o_sock_table;
174 size = roundup_pow_of_two(size);
175 if (size != orig_size) {
176 sock_table = vmalloc_huge(size * sizeof(*sock_table),
177 GFP_KERNEL);
178 if (!sock_table) {
179 mutex_unlock(&sock_flow_mutex);
180 return -ENOMEM;
181 }
182 net_hotdata.rps_cpu_mask =
183 roundup_pow_of_two(nr_cpu_ids) - 1;
184 log = ilog2(size);
185 tag_ptr = (rps_tag_ptr)sock_table | log;
186 }
187
188 for (i = 0; i < size; i++)
189 sock_table[i].ent = RPS_NO_CPU;
190 } else {
191 sock_table = NULL;
192 tag_ptr = 0UL;
193 }
194 if (tag_ptr != o_tag_ptr) {
195 smp_store_release(&net_hotdata.rps_sock_flow_table, tag_ptr);
196 if (sock_table) {
197 static_branch_inc(&rps_needed);
198 static_branch_inc(&rfs_needed);
199 }
200 if (o_sock_table) {
201 static_branch_dec(&rps_needed);
202 static_branch_dec(&rfs_needed);
203 tofree = o_sock_table;
204 }
205 }
206
207unlock:
208 mutex_unlock(&sock_flow_mutex);
209
210 kvfree_rcu_mightsleep(tofree);
211 return ret;
212}
213#endif /* CONFIG_RPS */
214
215#ifdef CONFIG_NET_FLOW_LIMIT
216static DEFINE_MUTEX(flow_limit_update_mutex);
217
218static int flow_limit_cpu_sysctl(const struct ctl_table *table, int write,
219 void *buffer, size_t *lenp, loff_t *ppos)
220{
221 struct sd_flow_limit *cur;
222 struct softnet_data *sd;
223 cpumask_var_t mask;
224 int i, len, ret = 0;
225
226 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
227 return -ENOMEM;
228
229 if (write) {
230 ret = cpumask_parse(buffer, mask);
231 if (ret)
232 goto done;
233
234 mutex_lock(&flow_limit_update_mutex);
235 len = sizeof(*cur) + netdev_flow_limit_table_len;
236 for_each_possible_cpu(i) {
237 sd = &per_cpu(softnet_data, i);
238 cur = rcu_dereference_protected(sd->flow_limit,
239 lockdep_is_held(&flow_limit_update_mutex));
240 if (cur && !cpumask_test_cpu(i, mask)) {
241 RCU_INIT_POINTER(sd->flow_limit, NULL);
242 kfree_rcu(cur, rcu);
243 } else if (!cur && cpumask_test_cpu(i, mask)) {
244 cur = kzalloc_node(len, GFP_KERNEL,
245 cpu_to_node(i));
246 if (!cur) {
247 /* not unwinding previous changes */
248 ret = -ENOMEM;
249 goto write_unlock;
250 }
251 cur->log_buckets = ilog2(netdev_flow_limit_table_len);
252 rcu_assign_pointer(sd->flow_limit, cur);
253 }
254 }
255write_unlock:
256 mutex_unlock(&flow_limit_update_mutex);
257 } else {
258 cpumask_clear(mask);
259 rcu_read_lock();
260 for_each_possible_cpu(i) {
261 sd = &per_cpu(softnet_data, i);
262 if (rcu_dereference(sd->flow_limit))
263 cpumask_set_cpu(i, mask);
264 }
265 rcu_read_unlock();
266
267 ret = dump_cpumask(buffer, lenp, ppos, mask);
268 }
269
270done:
271 free_cpumask_var(mask);
272 return ret;
273}
274
275static int flow_limit_table_len_sysctl(const struct ctl_table *table, int write,
276 void *buffer, size_t *lenp, loff_t *ppos)
277{
278 unsigned int old, *ptr;
279 int ret;
280
281 mutex_lock(&flow_limit_update_mutex);
282
283 ptr = table->data;
284 old = *ptr;
285 ret = proc_dointvec(table, write, buffer, lenp, ppos);
286 if (!ret && write && !is_power_of_2(*ptr)) {
287 *ptr = old;
288 ret = -EINVAL;
289 }
290
291 mutex_unlock(&flow_limit_update_mutex);
292 return ret;
293}
294#endif /* CONFIG_NET_FLOW_LIMIT */
295
296#ifdef CONFIG_NET_SCHED
297static int set_default_qdisc(const struct ctl_table *table, int write,
298 void *buffer, size_t *lenp, loff_t *ppos)
299{
300 char id[IFNAMSIZ];
301 struct ctl_table tbl = {
302 .data = id,
303 .maxlen = IFNAMSIZ,
304 };
305 int ret;
306
307 qdisc_get_default(id, IFNAMSIZ);
308
309 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
310 if (write && ret == 0)
311 ret = qdisc_set_default(id);
312 return ret;
313}
314#endif
315
316static int proc_do_dev_weight(const struct ctl_table *table, int write,
317 void *buffer, size_t *lenp, loff_t *ppos)
318{
319 static DEFINE_MUTEX(dev_weight_mutex);
320 int ret, weight;
321
322 mutex_lock(&dev_weight_mutex);
323 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
324 if (!ret && write) {
325 weight = READ_ONCE(weight_p);
326 WRITE_ONCE(net_hotdata.dev_rx_weight, weight * dev_weight_rx_bias);
327 WRITE_ONCE(net_hotdata.dev_tx_weight, weight * dev_weight_tx_bias);
328 }
329 mutex_unlock(&dev_weight_mutex);
330
331 return ret;
332}
333
334static int proc_do_rss_key(const struct ctl_table *table, int write,
335 void *buffer, size_t *lenp, loff_t *ppos)
336{
337 char buf[NETDEV_RSS_KEY_LEN * 3];
338 struct ctl_table fake_table;
339 char *pos = buf;
340
341 for (int i = 0; i < NETDEV_RSS_KEY_LEN; i++) {
342 pos = hex_byte_pack(pos, netdev_rss_key[i]);
343 *pos++ = ':';
344 }
345 *(--pos) = 0;
346
347 fake_table.data = buf;
348 fake_table.maxlen = sizeof(buf);
349 return proc_dostring(&fake_table, write, buffer, lenp, ppos);
350}
351
352static int proc_do_skb_defer_max(const struct ctl_table *table, int write,
353 void *buffer, size_t *lenp, loff_t *ppos)
354{
355 static DEFINE_MUTEX(skb_defer_max_mutex);
356 int ret, oval, nval;
357
358 mutex_lock(&skb_defer_max_mutex);
359
360 oval = !net_hotdata.sysctl_skb_defer_max;
361 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
362 nval = !net_hotdata.sysctl_skb_defer_max;
363
364 if (nval != oval) {
365 if (nval)
366 static_branch_enable(&skb_defer_disable_key);
367 else
368 static_branch_disable(&skb_defer_disable_key);
369 }
370
371 mutex_unlock(&skb_defer_max_mutex);
372 return ret;
373}
374
375#ifdef CONFIG_BPF_JIT
376static int proc_dointvec_minmax_bpf_enable(const struct ctl_table *table, int write,
377 void *buffer, size_t *lenp,
378 loff_t *ppos)
379{
380 int ret, jit_enable = *(int *)table->data;
381 int min = *(int *)table->extra1;
382 int max = *(int *)table->extra2;
383 struct ctl_table tmp = *table;
384
385 if (write && !capable(CAP_SYS_ADMIN))
386 return -EPERM;
387
388 tmp.data = &jit_enable;
389 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
390 if (write && !ret) {
391 if (jit_enable < 2 ||
392 (jit_enable == 2 && bpf_dump_raw_ok(current_cred()))) {
393 *(int *)table->data = jit_enable;
394 if (jit_enable == 2)
395 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
396 } else {
397 ret = -EPERM;
398 }
399 }
400
401 if (write && ret && min == max)
402 pr_info_once("CONFIG_BPF_JIT_ALWAYS_ON is enabled, bpf_jit_enable is permanently set to 1.\n");
403
404 return ret;
405}
406
407# ifdef CONFIG_HAVE_EBPF_JIT
408static int
409proc_dointvec_minmax_bpf_restricted(const struct ctl_table *table, int write,
410 void *buffer, size_t *lenp, loff_t *ppos)
411{
412 if (!capable(CAP_SYS_ADMIN))
413 return -EPERM;
414
415 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
416}
417# endif /* CONFIG_HAVE_EBPF_JIT */
418
419static int
420proc_dolongvec_minmax_bpf_restricted(const struct ctl_table *table, int write,
421 void *buffer, size_t *lenp, loff_t *ppos)
422{
423 if (!capable(CAP_SYS_ADMIN))
424 return -EPERM;
425
426 return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
427}
428#endif
429
430static struct ctl_table net_core_table[] = {
431 {
432 .procname = "mem_pcpu_rsv",
433 .data = &net_hotdata.sysctl_mem_pcpu_rsv,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = proc_dointvec_minmax,
437 .extra1 = &min_mem_pcpu_rsv,
438 },
439 {
440 .procname = "dev_weight",
441 .data = &weight_p,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_do_dev_weight,
445 .extra1 = SYSCTL_ONE,
446 },
447 {
448 .procname = "dev_weight_rx_bias",
449 .data = &dev_weight_rx_bias,
450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = proc_do_dev_weight,
453 .extra1 = SYSCTL_ONE,
454 },
455 {
456 .procname = "dev_weight_tx_bias",
457 .data = &dev_weight_tx_bias,
458 .maxlen = sizeof(int),
459 .mode = 0644,
460 .proc_handler = proc_do_dev_weight,
461 .extra1 = SYSCTL_ONE,
462 },
463 {
464 .procname = "netdev_max_backlog",
465 .data = &net_hotdata.max_backlog,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec
469 },
470 {
471 .procname = "qdisc_max_burst",
472 .data = &net_hotdata.qdisc_max_burst,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec
476 },
477 {
478 .procname = "netdev_rss_key",
479 .data = &netdev_rss_key,
480 .maxlen = sizeof(int),
481 .mode = 0444,
482 .proc_handler = proc_do_rss_key,
483 },
484#ifdef CONFIG_BPF_JIT
485 {
486 .procname = "bpf_jit_enable",
487 .data = &bpf_jit_enable,
488 .maxlen = sizeof(int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec_minmax_bpf_enable,
491# ifdef CONFIG_BPF_JIT_ALWAYS_ON
492 .extra1 = SYSCTL_ONE,
493 .extra2 = SYSCTL_ONE,
494# else
495 .extra1 = SYSCTL_ZERO,
496 .extra2 = SYSCTL_TWO,
497# endif
498 },
499# ifdef CONFIG_HAVE_EBPF_JIT
500 {
501 .procname = "bpf_jit_harden",
502 .data = &bpf_jit_harden,
503 .maxlen = sizeof(int),
504 .mode = 0600,
505 .proc_handler = proc_dointvec_minmax_bpf_restricted,
506 .extra1 = SYSCTL_ZERO,
507 .extra2 = SYSCTL_TWO,
508 },
509 {
510 .procname = "bpf_jit_kallsyms",
511 .data = &bpf_jit_kallsyms,
512 .maxlen = sizeof(int),
513 .mode = 0600,
514 .proc_handler = proc_dointvec_minmax_bpf_restricted,
515 .extra1 = SYSCTL_ZERO,
516 .extra2 = SYSCTL_ONE,
517 },
518# endif
519 {
520 .procname = "bpf_jit_limit",
521 .data = &bpf_jit_limit,
522 .maxlen = sizeof(long),
523 .mode = 0600,
524 .proc_handler = proc_dolongvec_minmax_bpf_restricted,
525 .extra1 = SYSCTL_LONG_ONE,
526 .extra2 = &bpf_jit_limit_max,
527 },
528#endif
529 {
530 .procname = "netdev_tstamp_prequeue",
531 .data = &net_hotdata.tstamp_prequeue,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = proc_dointvec
535 },
536 {
537 .procname = "message_cost",
538 .data = &net_ratelimit_state.interval,
539 .maxlen = sizeof(int),
540 .mode = 0644,
541 .proc_handler = proc_dointvec_jiffies,
542 },
543 {
544 .procname = "message_burst",
545 .data = &net_ratelimit_state.burst,
546 .maxlen = sizeof(int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec,
549 },
550#ifdef CONFIG_RPS
551 {
552 .procname = "rps_sock_flow_entries",
553 .maxlen = sizeof(int),
554 .mode = 0644,
555 .proc_handler = rps_sock_flow_sysctl
556 },
557#endif
558#ifdef CONFIG_NET_FLOW_LIMIT
559 {
560 .procname = "flow_limit_cpu_bitmap",
561 .mode = 0644,
562 .proc_handler = flow_limit_cpu_sysctl
563 },
564 {
565 .procname = "flow_limit_table_len",
566 .data = &netdev_flow_limit_table_len,
567 .maxlen = sizeof(int),
568 .mode = 0644,
569 .proc_handler = flow_limit_table_len_sysctl
570 },
571#endif /* CONFIG_NET_FLOW_LIMIT */
572#ifdef CONFIG_NET_RX_BUSY_POLL
573 {
574 .procname = "busy_poll",
575 .data = &sysctl_net_busy_poll,
576 .maxlen = sizeof(unsigned int),
577 .mode = 0644,
578 .proc_handler = proc_dointvec_minmax,
579 .extra1 = SYSCTL_ZERO,
580 },
581 {
582 .procname = "busy_read",
583 .data = &sysctl_net_busy_read,
584 .maxlen = sizeof(unsigned int),
585 .mode = 0644,
586 .proc_handler = proc_dointvec_minmax,
587 .extra1 = SYSCTL_ZERO,
588 },
589#endif
590#ifdef CONFIG_NET_SCHED
591 {
592 .procname = "default_qdisc",
593 .mode = 0644,
594 .maxlen = IFNAMSIZ,
595 .proc_handler = set_default_qdisc
596 },
597#endif
598 {
599 .procname = "netdev_budget",
600 .data = &net_hotdata.netdev_budget,
601 .maxlen = sizeof(int),
602 .mode = 0644,
603 .proc_handler = proc_dointvec
604 },
605 {
606 .procname = "warnings",
607 .data = &net_msg_warn,
608 .maxlen = sizeof(int),
609 .mode = 0644,
610 .proc_handler = proc_dointvec
611 },
612 {
613 .procname = "max_skb_frags",
614 .data = &net_hotdata.sysctl_max_skb_frags,
615 .maxlen = sizeof(int),
616 .mode = 0644,
617 .proc_handler = proc_dointvec_minmax,
618 .extra1 = SYSCTL_ONE,
619 .extra2 = &max_skb_frags,
620 },
621 {
622 .procname = "netdev_budget_usecs",
623 .data = &net_hotdata.netdev_budget_usecs,
624 .maxlen = sizeof(unsigned int),
625 .mode = 0644,
626 .proc_handler = proc_dointvec_minmax,
627 .extra1 = &netdev_budget_usecs_min,
628 },
629 {
630 .procname = "fb_tunnels_only_for_init_net",
631 .data = &sysctl_fb_tunnels_only_for_init_net,
632 .maxlen = sizeof(int),
633 .mode = 0644,
634 .proc_handler = proc_dointvec_minmax,
635 .extra1 = SYSCTL_ZERO,
636 .extra2 = SYSCTL_TWO,
637 },
638 {
639 .procname = "devconf_inherit_init_net",
640 .data = &sysctl_devconf_inherit_init_net,
641 .maxlen = sizeof(int),
642 .mode = 0644,
643 .proc_handler = proc_dointvec_minmax,
644 .extra1 = SYSCTL_ZERO,
645 .extra2 = SYSCTL_THREE,
646 },
647 {
648 .procname = "high_order_alloc_disable",
649 .data = &net_high_order_alloc_disable_key.key,
650 .maxlen = sizeof(net_high_order_alloc_disable_key),
651 .mode = 0644,
652 .proc_handler = proc_do_static_key,
653 },
654 {
655 .procname = "gro_normal_batch",
656 .data = &net_hotdata.gro_normal_batch,
657 .maxlen = sizeof(unsigned int),
658 .mode = 0644,
659 .proc_handler = proc_dointvec_minmax,
660 .extra1 = SYSCTL_ONE,
661 },
662 {
663 .procname = "netdev_unregister_timeout_secs",
664 .data = &netdev_unregister_timeout_secs,
665 .maxlen = sizeof(unsigned int),
666 .mode = 0644,
667 .proc_handler = proc_dointvec_minmax,
668 .extra1 = SYSCTL_ONE,
669 .extra2 = &int_3600,
670 },
671 {
672 .procname = "skb_defer_max",
673 .data = &net_hotdata.sysctl_skb_defer_max,
674 .maxlen = sizeof(unsigned int),
675 .mode = 0644,
676 .proc_handler = proc_do_skb_defer_max,
677 .extra1 = SYSCTL_ZERO,
678 },
679};
680
681static const struct ctl_table netns_core_table[] = {
682#if IS_ENABLED(CONFIG_RPS)
683 {
684 .procname = "rps_default_mask",
685 .data = &init_net,
686 .mode = 0644,
687 .proc_handler = rps_default_mask_sysctl
688 },
689#endif
690 {
691 .procname = "somaxconn",
692 .data = &init_net.core.sysctl_somaxconn,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .extra1 = SYSCTL_ZERO,
696 .proc_handler = proc_dointvec_minmax
697 },
698 {
699 .procname = "optmem_max",
700 .data = &init_net.core.sysctl_optmem_max,
701 .maxlen = sizeof(int),
702 .mode = 0644,
703 .extra1 = SYSCTL_ZERO,
704 .proc_handler = proc_dointvec_minmax
705 },
706 {
707 .procname = "txrehash",
708 .data = &init_net.core.sysctl_txrehash,
709 .maxlen = sizeof(u8),
710 .mode = 0644,
711 .extra1 = SYSCTL_ZERO,
712 .extra2 = SYSCTL_ONE,
713 .proc_handler = proc_dou8vec_minmax,
714 },
715 {
716 .procname = "txq_reselection_ms",
717 .data = &init_net.core.sysctl_txq_reselection,
718 .maxlen = sizeof(int),
719 .mode = 0644,
720 .proc_handler = proc_dointvec_ms_jiffies,
721 },
722 {
723 .procname = "tstamp_allow_data",
724 .data = &init_net.core.sysctl_tstamp_allow_data,
725 .maxlen = sizeof(u8),
726 .mode = 0644,
727 .proc_handler = proc_dou8vec_minmax,
728 .extra1 = SYSCTL_ZERO,
729 .extra2 = SYSCTL_ONE
730 },
731 {
732 .procname = "bypass_prot_mem",
733 .data = &init_net.core.sysctl_bypass_prot_mem,
734 .maxlen = sizeof(u8),
735 .mode = 0644,
736 .proc_handler = proc_dou8vec_minmax,
737 .extra1 = SYSCTL_ZERO,
738 .extra2 = SYSCTL_ONE
739 },
740 /* sysctl_core_net_init() will set the values after this
741 * to readonly in network namespaces
742 */
743 {
744 .procname = "wmem_max",
745 .data = &sysctl_wmem_max,
746 .maxlen = sizeof(int),
747 .mode = 0644,
748 .proc_handler = proc_dointvec_minmax,
749 .extra1 = &min_sndbuf,
750 },
751 {
752 .procname = "rmem_max",
753 .data = &sysctl_rmem_max,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = proc_dointvec_minmax,
757 .extra1 = &min_rcvbuf,
758 },
759 {
760 .procname = "wmem_default",
761 .data = &sysctl_wmem_default,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = proc_dointvec_minmax,
765 .extra1 = &min_sndbuf,
766 },
767 {
768 .procname = "rmem_default",
769 .data = &sysctl_rmem_default,
770 .maxlen = sizeof(int),
771 .mode = 0644,
772 .proc_handler = proc_dointvec_minmax,
773 .extra1 = &min_rcvbuf,
774 },
775};
776
777static int __init fb_tunnels_only_for_init_net_sysctl_setup(char *str)
778{
779 /* fallback tunnels for initns only */
780 if (!strncmp(str, "initns", 6))
781 sysctl_fb_tunnels_only_for_init_net = 1;
782 /* no fallback tunnels anywhere */
783 else if (!strncmp(str, "none", 4))
784 sysctl_fb_tunnels_only_for_init_net = 2;
785
786 return 1;
787}
788__setup("fb_tunnels=", fb_tunnels_only_for_init_net_sysctl_setup);
789
790static const struct ctl_table *netns_core_table_dup(struct net *net)
791{
792 size_t table_size = ARRAY_SIZE(netns_core_table);
793 struct ctl_table *tbl;
794 int i;
795
796 tbl = kmemdup(netns_core_table, sizeof(netns_core_table), GFP_KERNEL);
797 if (!tbl)
798 return NULL;
799
800 for (i = 0; i < table_size; ++i) {
801 if (tbl[i].data == &sysctl_wmem_max)
802 break;
803
804 tbl[i].data += (char *)net - (char *)&init_net;
805 }
806 for (; i < table_size; ++i)
807 tbl[i].mode &= ~0222;
808
809 return tbl;
810}
811
812static __net_init int sysctl_core_net_init(struct net *net)
813{
814 size_t table_size = ARRAY_SIZE(netns_core_table);
815 const struct ctl_table *tbl;
816
817 tbl = netns_core_table;
818 if (!net_eq(net, &init_net)) {
819 tbl = netns_core_table_dup(net);
820 if (tbl == NULL)
821 goto err_dup;
822 }
823
824 net->core.sysctl_hdr = register_net_sysctl_sz(net, "net/core", tbl, table_size);
825 if (net->core.sysctl_hdr == NULL)
826 goto err_reg;
827
828 return 0;
829
830err_reg:
831 if (tbl != netns_core_table)
832 kfree(tbl);
833err_dup:
834 return -ENOMEM;
835}
836
837static __net_exit void sysctl_core_net_exit(struct net *net)
838{
839 const struct ctl_table *tbl;
840
841 tbl = net->core.sysctl_hdr->ctl_table_arg;
842 unregister_net_sysctl_table(net->core.sysctl_hdr);
843 BUG_ON(tbl == netns_core_table);
844#if IS_ENABLED(CONFIG_RPS)
845 kfree(net->core.rps_default_mask);
846#endif
847 kfree(tbl);
848}
849
850static __net_initdata struct pernet_operations sysctl_core_ops = {
851 .init = sysctl_core_net_init,
852 .exit = sysctl_core_net_exit,
853};
854
855static __init int sysctl_core_init(void)
856{
857 register_net_sysctl(&init_net, "net/core", net_core_table);
858 return register_pernet_subsys(&sysctl_core_ops);
859}
860
861fs_initcall(sysctl_core_init);