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
34 static int net_msg_warn; /* Unused, but still a sysctl */
35
36 int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
37 EXPORT_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 */
46 int sysctl_devconf_inherit_init_net __read_mostly;
47 EXPORT_SYMBOL(sysctl_devconf_inherit_init_net);
48
49 #if IS_ENABLED(CONFIG_NET_FLOW_LIMIT) || IS_ENABLED(CONFIG_RPS)
dump_cpumask(void * buffer,size_t * lenp,loff_t * ppos,struct cpumask * mask)50 static 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
rps_default_mask_cow_alloc(struct net * net)78 static 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
rps_default_mask_sysctl(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)94 static 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
120 done:
121 rtnl_unlock();
122 return err;
123 }
124
rps_sock_flow_sysctl(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)125 static 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
192 static DEFINE_MUTEX(flow_limit_update_mutex);
193
flow_limit_cpu_sysctl(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)194 static 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 }
231 write_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
246 done:
247 free_cpumask_var(mask);
248 return ret;
249 }
250
flow_limit_table_len_sysctl(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)251 static 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
set_default_qdisc(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)273 static 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
proc_do_dev_weight(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)292 static 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
proc_do_rss_key(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)310 static 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
proc_dointvec_minmax_bpf_enable(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)323 static 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
355 static int
proc_dointvec_minmax_bpf_restricted(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)356 proc_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
366 static int
proc_dolongvec_minmax_bpf_restricted(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)367 proc_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
377 static 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 = "optmem_max",
513 .data = &sysctl_optmem_max,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec
517 },
518 {
519 .procname = "tstamp_allow_data",
520 .data = &sysctl_tstamp_allow_data,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = proc_dointvec_minmax,
524 .extra1 = SYSCTL_ZERO,
525 .extra2 = SYSCTL_ONE
526 },
527 #ifdef CONFIG_RPS
528 {
529 .procname = "rps_sock_flow_entries",
530 .maxlen = sizeof(int),
531 .mode = 0644,
532 .proc_handler = rps_sock_flow_sysctl
533 },
534 #endif
535 #ifdef CONFIG_NET_FLOW_LIMIT
536 {
537 .procname = "flow_limit_cpu_bitmap",
538 .mode = 0644,
539 .proc_handler = flow_limit_cpu_sysctl
540 },
541 {
542 .procname = "flow_limit_table_len",
543 .data = &netdev_flow_limit_table_len,
544 .maxlen = sizeof(int),
545 .mode = 0644,
546 .proc_handler = flow_limit_table_len_sysctl
547 },
548 #endif /* CONFIG_NET_FLOW_LIMIT */
549 #ifdef CONFIG_NET_RX_BUSY_POLL
550 {
551 .procname = "busy_poll",
552 .data = &sysctl_net_busy_poll,
553 .maxlen = sizeof(unsigned int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec_minmax,
556 .extra1 = SYSCTL_ZERO,
557 },
558 {
559 .procname = "busy_read",
560 .data = &sysctl_net_busy_read,
561 .maxlen = sizeof(unsigned int),
562 .mode = 0644,
563 .proc_handler = proc_dointvec_minmax,
564 .extra1 = SYSCTL_ZERO,
565 },
566 #endif
567 #ifdef CONFIG_NET_SCHED
568 {
569 .procname = "default_qdisc",
570 .mode = 0644,
571 .maxlen = IFNAMSIZ,
572 .proc_handler = set_default_qdisc
573 },
574 #endif
575 {
576 .procname = "netdev_budget",
577 .data = &netdev_budget,
578 .maxlen = sizeof(int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec
581 },
582 {
583 .procname = "warnings",
584 .data = &net_msg_warn,
585 .maxlen = sizeof(int),
586 .mode = 0644,
587 .proc_handler = proc_dointvec
588 },
589 {
590 .procname = "max_skb_frags",
591 .data = &sysctl_max_skb_frags,
592 .maxlen = sizeof(int),
593 .mode = 0644,
594 .proc_handler = proc_dointvec_minmax,
595 .extra1 = SYSCTL_ONE,
596 .extra2 = &max_skb_frags,
597 },
598 {
599 .procname = "netdev_budget_usecs",
600 .data = &netdev_budget_usecs,
601 .maxlen = sizeof(unsigned int),
602 .mode = 0644,
603 .proc_handler = proc_dointvec_minmax,
604 .extra1 = SYSCTL_ZERO,
605 },
606 {
607 .procname = "fb_tunnels_only_for_init_net",
608 .data = &sysctl_fb_tunnels_only_for_init_net,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = proc_dointvec_minmax,
612 .extra1 = SYSCTL_ZERO,
613 .extra2 = SYSCTL_TWO,
614 },
615 {
616 .procname = "devconf_inherit_init_net",
617 .data = &sysctl_devconf_inherit_init_net,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = proc_dointvec_minmax,
621 .extra1 = SYSCTL_ZERO,
622 .extra2 = SYSCTL_THREE,
623 },
624 {
625 .procname = "high_order_alloc_disable",
626 .data = &net_high_order_alloc_disable_key.key,
627 .maxlen = sizeof(net_high_order_alloc_disable_key),
628 .mode = 0644,
629 .proc_handler = proc_do_static_key,
630 },
631 {
632 .procname = "gro_normal_batch",
633 .data = &gro_normal_batch,
634 .maxlen = sizeof(unsigned int),
635 .mode = 0644,
636 .proc_handler = proc_dointvec_minmax,
637 .extra1 = SYSCTL_ONE,
638 },
639 {
640 .procname = "netdev_unregister_timeout_secs",
641 .data = &netdev_unregister_timeout_secs,
642 .maxlen = sizeof(unsigned int),
643 .mode = 0644,
644 .proc_handler = proc_dointvec_minmax,
645 .extra1 = SYSCTL_ONE,
646 .extra2 = &int_3600,
647 },
648 {
649 .procname = "skb_defer_max",
650 .data = &sysctl_skb_defer_max,
651 .maxlen = sizeof(unsigned int),
652 .mode = 0644,
653 .proc_handler = proc_dointvec_minmax,
654 .extra1 = SYSCTL_ZERO,
655 },
656 { }
657 };
658
659 static struct ctl_table netns_core_table[] = {
660 #if IS_ENABLED(CONFIG_RPS)
661 {
662 .procname = "rps_default_mask",
663 .data = &init_net,
664 .mode = 0644,
665 .proc_handler = rps_default_mask_sysctl
666 },
667 #endif
668 {
669 .procname = "somaxconn",
670 .data = &init_net.core.sysctl_somaxconn,
671 .maxlen = sizeof(int),
672 .mode = 0644,
673 .extra1 = SYSCTL_ZERO,
674 .proc_handler = proc_dointvec_minmax
675 },
676 {
677 .procname = "txrehash",
678 .data = &init_net.core.sysctl_txrehash,
679 .maxlen = sizeof(u8),
680 .mode = 0644,
681 .extra1 = SYSCTL_ZERO,
682 .extra2 = SYSCTL_ONE,
683 .proc_handler = proc_dou8vec_minmax,
684 },
685 { }
686 };
687
fb_tunnels_only_for_init_net_sysctl_setup(char * str)688 static int __init fb_tunnels_only_for_init_net_sysctl_setup(char *str)
689 {
690 /* fallback tunnels for initns only */
691 if (!strncmp(str, "initns", 6))
692 sysctl_fb_tunnels_only_for_init_net = 1;
693 /* no fallback tunnels anywhere */
694 else if (!strncmp(str, "none", 4))
695 sysctl_fb_tunnels_only_for_init_net = 2;
696
697 return 1;
698 }
699 __setup("fb_tunnels=", fb_tunnels_only_for_init_net_sysctl_setup);
700
sysctl_core_net_init(struct net * net)701 static __net_init int sysctl_core_net_init(struct net *net)
702 {
703 struct ctl_table *tbl, *tmp;
704
705 tbl = netns_core_table;
706 if (!net_eq(net, &init_net)) {
707 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
708 if (tbl == NULL)
709 goto err_dup;
710
711 for (tmp = tbl; tmp->procname; tmp++)
712 tmp->data += (char *)net - (char *)&init_net;
713 }
714
715 net->core.sysctl_hdr = register_net_sysctl_sz(net, "net/core", tbl,
716 ARRAY_SIZE(netns_core_table));
717 if (net->core.sysctl_hdr == NULL)
718 goto err_reg;
719
720 return 0;
721
722 err_reg:
723 if (tbl != netns_core_table)
724 kfree(tbl);
725 err_dup:
726 return -ENOMEM;
727 }
728
sysctl_core_net_exit(struct net * net)729 static __net_exit void sysctl_core_net_exit(struct net *net)
730 {
731 struct ctl_table *tbl;
732
733 tbl = net->core.sysctl_hdr->ctl_table_arg;
734 unregister_net_sysctl_table(net->core.sysctl_hdr);
735 BUG_ON(tbl == netns_core_table);
736 #if IS_ENABLED(CONFIG_RPS)
737 kfree(net->core.rps_default_mask);
738 #endif
739 kfree(tbl);
740 }
741
742 static __net_initdata struct pernet_operations sysctl_core_ops = {
743 .init = sysctl_core_net_init,
744 .exit = sysctl_core_net_exit,
745 };
746
sysctl_core_init(void)747 static __init int sysctl_core_init(void)
748 {
749 register_net_sysctl(&init_net, "net/core", net_core_table);
750 return register_pernet_subsys(&sysctl_core_ops);
751 }
752
753 fs_initcall(sysctl_core_init);
754