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