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