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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;
31static long long_one __maybe_unused = 1;
32static long long_max __maybe_unused = LONG_MAX;
33
34static int net_msg_warn;
35
36int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
37EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
38
39
40
41
42
43
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 __user *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
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 synchronize_rcu();
105 vfree(orig_sock_table);
106 }
107 }
108 }
109
110 mutex_unlock(&sock_flow_mutex);
111
112 return ret;
113}
114#endif
115
116#ifdef CONFIG_NET_FLOW_LIMIT
117static DEFINE_MUTEX(flow_limit_update_mutex);
118
119static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
120 void __user *buffer, size_t *lenp,
121 loff_t *ppos)
122{
123 struct sd_flow_limit *cur;
124 struct softnet_data *sd;
125 cpumask_var_t mask;
126 int i, len, ret = 0;
127
128 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
129 return -ENOMEM;
130
131 if (write) {
132 ret = cpumask_parse_user(buffer, *lenp, mask);
133 if (ret)
134 goto done;
135
136 mutex_lock(&flow_limit_update_mutex);
137 len = sizeof(*cur) + netdev_flow_limit_table_len;
138 for_each_possible_cpu(i) {
139 sd = &per_cpu(softnet_data, i);
140 cur = rcu_dereference_protected(sd->flow_limit,
141 lockdep_is_held(&flow_limit_update_mutex));
142 if (cur && !cpumask_test_cpu(i, mask)) {
143 RCU_INIT_POINTER(sd->flow_limit, NULL);
144 synchronize_rcu();
145 kfree(cur);
146 } else if (!cur && cpumask_test_cpu(i, mask)) {
147 cur = kzalloc_node(len, GFP_KERNEL,
148 cpu_to_node(i));
149 if (!cur) {
150
151 ret = -ENOMEM;
152 goto write_unlock;
153 }
154 cur->num_buckets = netdev_flow_limit_table_len;
155 rcu_assign_pointer(sd->flow_limit, cur);
156 }
157 }
158write_unlock:
159 mutex_unlock(&flow_limit_update_mutex);
160 } else {
161 char kbuf[128];
162
163 if (*ppos || !*lenp) {
164 *lenp = 0;
165 goto done;
166 }
167
168 cpumask_clear(mask);
169 rcu_read_lock();
170 for_each_possible_cpu(i) {
171 sd = &per_cpu(softnet_data, i);
172 if (rcu_dereference(sd->flow_limit))
173 cpumask_set_cpu(i, mask);
174 }
175 rcu_read_unlock();
176
177 len = min(sizeof(kbuf) - 1, *lenp);
178 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
179 if (!len) {
180 *lenp = 0;
181 goto done;
182 }
183 if (len < *lenp)
184 kbuf[len++] = '\n';
185 if (copy_to_user(buffer, kbuf, len)) {
186 ret = -EFAULT;
187 goto done;
188 }
189 *lenp = len;
190 *ppos += len;
191 }
192
193done:
194 free_cpumask_var(mask);
195 return ret;
196}
197
198static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
199 void __user *buffer, size_t *lenp,
200 loff_t *ppos)
201{
202 unsigned int old, *ptr;
203 int ret;
204
205 mutex_lock(&flow_limit_update_mutex);
206
207 ptr = table->data;
208 old = *ptr;
209 ret = proc_dointvec(table, write, buffer, lenp, ppos);
210 if (!ret && write && !is_power_of_2(*ptr)) {
211 *ptr = old;
212 ret = -EINVAL;
213 }
214
215 mutex_unlock(&flow_limit_update_mutex);
216 return ret;
217}
218#endif
219
220#ifdef CONFIG_NET_SCHED
221static int set_default_qdisc(struct ctl_table *table, int write,
222 void __user *buffer, size_t *lenp, loff_t *ppos)
223{
224 char id[IFNAMSIZ];
225 struct ctl_table tbl = {
226 .data = id,
227 .maxlen = IFNAMSIZ,
228 };
229 int ret;
230
231 qdisc_get_default(id, IFNAMSIZ);
232
233 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
234 if (write && ret == 0)
235 ret = qdisc_set_default(id);
236 return ret;
237}
238#endif
239
240static int proc_do_dev_weight(struct ctl_table *table, int write,
241 void __user *buffer, size_t *lenp, loff_t *ppos)
242{
243 int ret;
244
245 ret = proc_dointvec(table, write, buffer, lenp, ppos);
246 if (ret != 0)
247 return ret;
248
249 dev_rx_weight = weight_p * dev_weight_rx_bias;
250 dev_tx_weight = weight_p * dev_weight_tx_bias;
251
252 return ret;
253}
254
255static int proc_do_rss_key(struct ctl_table *table, int write,
256 void __user *buffer, size_t *lenp, loff_t *ppos)
257{
258 struct ctl_table fake_table;
259 char buf[NETDEV_RSS_KEY_LEN * 3];
260
261 snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
262 fake_table.data = buf;
263 fake_table.maxlen = sizeof(buf);
264 return proc_dostring(&fake_table, write, buffer, lenp, ppos);
265}
266
267#ifdef CONFIG_BPF_JIT
268static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
269 void __user *buffer, size_t *lenp,
270 loff_t *ppos)
271{
272 int ret, jit_enable = *(int *)table->data;
273 struct ctl_table tmp = *table;
274
275 if (write && !capable(CAP_SYS_ADMIN))
276 return -EPERM;
277
278 tmp.data = &jit_enable;
279 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
280 if (write && !ret) {
281 if (jit_enable < 2 ||
282 (jit_enable == 2 && bpf_dump_raw_ok())) {
283 *(int *)table->data = jit_enable;
284 if (jit_enable == 2)
285 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
286 } else {
287 ret = -EPERM;
288 }
289 }
290 return ret;
291}
292
293static int
294proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
295 void __user *buffer, size_t *lenp,
296 loff_t *ppos)
297{
298 if (!capable(CAP_SYS_ADMIN))
299 return -EPERM;
300
301 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
302}
303
304static int
305proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,
306 void __user *buffer, size_t *lenp,
307 loff_t *ppos)
308{
309 if (!capable(CAP_SYS_ADMIN))
310 return -EPERM;
311
312 return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
313}
314#endif
315
316static struct ctl_table net_core_table[] = {
317#ifdef CONFIG_NET
318 {
319 .procname = "wmem_max",
320 .data = &sysctl_wmem_max,
321 .maxlen = sizeof(int),
322 .mode = 0644,
323 .proc_handler = proc_dointvec_minmax,
324 .extra1 = &min_sndbuf,
325 },
326 {
327 .procname = "rmem_max",
328 .data = &sysctl_rmem_max,
329 .maxlen = sizeof(int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec_minmax,
332 .extra1 = &min_rcvbuf,
333 },
334 {
335 .procname = "wmem_default",
336 .data = &sysctl_wmem_default,
337 .maxlen = sizeof(int),
338 .mode = 0644,
339 .proc_handler = proc_dointvec_minmax,
340 .extra1 = &min_sndbuf,
341 },
342 {
343 .procname = "rmem_default",
344 .data = &sysctl_rmem_default,
345 .maxlen = sizeof(int),
346 .mode = 0644,
347 .proc_handler = proc_dointvec_minmax,
348 .extra1 = &min_rcvbuf,
349 },
350 {
351 .procname = "dev_weight",
352 .data = &weight_p,
353 .maxlen = sizeof(int),
354 .mode = 0644,
355 .proc_handler = proc_do_dev_weight,
356 },
357 {
358 .procname = "dev_weight_rx_bias",
359 .data = &dev_weight_rx_bias,
360 .maxlen = sizeof(int),
361 .mode = 0644,
362 .proc_handler = proc_do_dev_weight,
363 },
364 {
365 .procname = "dev_weight_tx_bias",
366 .data = &dev_weight_tx_bias,
367 .maxlen = sizeof(int),
368 .mode = 0644,
369 .proc_handler = proc_do_dev_weight,
370 },
371 {
372 .procname = "netdev_max_backlog",
373 .data = &netdev_max_backlog,
374 .maxlen = sizeof(int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec
377 },
378 {
379 .procname = "netdev_rss_key",
380 .data = &netdev_rss_key,
381 .maxlen = sizeof(int),
382 .mode = 0444,
383 .proc_handler = proc_do_rss_key,
384 },
385#ifdef CONFIG_BPF_JIT
386 {
387 .procname = "bpf_jit_enable",
388 .data = &bpf_jit_enable,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec_minmax_bpf_enable,
392# ifdef CONFIG_BPF_JIT_ALWAYS_ON
393 .extra1 = &one,
394 .extra2 = &one,
395# else
396 .extra1 = &zero,
397 .extra2 = &two,
398# endif
399 },
400# ifdef CONFIG_HAVE_EBPF_JIT
401 {
402 .procname = "bpf_jit_harden",
403 .data = &bpf_jit_harden,
404 .maxlen = sizeof(int),
405 .mode = 0600,
406 .proc_handler = proc_dointvec_minmax_bpf_restricted,
407 .extra1 = &zero,
408 .extra2 = &two,
409 },
410 {
411 .procname = "bpf_jit_kallsyms",
412 .data = &bpf_jit_kallsyms,
413 .maxlen = sizeof(int),
414 .mode = 0600,
415 .proc_handler = proc_dointvec_minmax_bpf_restricted,
416 .extra1 = &zero,
417 .extra2 = &one,
418 },
419# endif
420 {
421 .procname = "bpf_jit_limit",
422 .data = &bpf_jit_limit,
423 .maxlen = sizeof(long),
424 .mode = 0600,
425 .proc_handler = proc_dolongvec_minmax_bpf_restricted,
426 .extra1 = &long_one,
427 .extra2 = &long_max,
428 },
429#endif
430 {
431 .procname = "netdev_tstamp_prequeue",
432 .data = &netdev_tstamp_prequeue,
433 .maxlen = sizeof(int),
434 .mode = 0644,
435 .proc_handler = proc_dointvec
436 },
437 {
438 .procname = "message_cost",
439 .data = &net_ratelimit_state.interval,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec_jiffies,
443 },
444 {
445 .procname = "message_burst",
446 .data = &net_ratelimit_state.burst,
447 .maxlen = sizeof(int),
448 .mode = 0644,
449 .proc_handler = proc_dointvec,
450 },
451 {
452 .procname = "optmem_max",
453 .data = &sysctl_optmem_max,
454 .maxlen = sizeof(int),
455 .mode = 0644,
456 .proc_handler = proc_dointvec
457 },
458 {
459 .procname = "tstamp_allow_data",
460 .data = &sysctl_tstamp_allow_data,
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = proc_dointvec_minmax,
464 .extra1 = &zero,
465 .extra2 = &one
466 },
467#ifdef CONFIG_RPS
468 {
469 .procname = "rps_sock_flow_entries",
470 .maxlen = sizeof(int),
471 .mode = 0644,
472 .proc_handler = rps_sock_flow_sysctl
473 },
474#endif
475#ifdef CONFIG_NET_FLOW_LIMIT
476 {
477 .procname = "flow_limit_cpu_bitmap",
478 .mode = 0644,
479 .proc_handler = flow_limit_cpu_sysctl
480 },
481 {
482 .procname = "flow_limit_table_len",
483 .data = &netdev_flow_limit_table_len,
484 .maxlen = sizeof(int),
485 .mode = 0644,
486 .proc_handler = flow_limit_table_len_sysctl
487 },
488#endif
489#ifdef CONFIG_NET_RX_BUSY_POLL
490 {
491 .procname = "busy_poll",
492 .data = &sysctl_net_busy_poll,
493 .maxlen = sizeof(unsigned int),
494 .mode = 0644,
495 .proc_handler = proc_dointvec_minmax,
496 .extra1 = &zero,
497 },
498 {
499 .procname = "busy_read",
500 .data = &sysctl_net_busy_read,
501 .maxlen = sizeof(unsigned int),
502 .mode = 0644,
503 .proc_handler = proc_dointvec_minmax,
504 .extra1 = &zero,
505 },
506#endif
507#ifdef CONFIG_NET_SCHED
508 {
509 .procname = "default_qdisc",
510 .mode = 0644,
511 .maxlen = IFNAMSIZ,
512 .proc_handler = set_default_qdisc
513 },
514#endif
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 = &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 = &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 = &zero,
554 .extra2 = &one,
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 = &zero,
563 .extra2 = &two,
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};
574
575static struct ctl_table netns_core_table[] = {
576 {
577 .procname = "somaxconn",
578 .data = &init_net.core.sysctl_somaxconn,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .extra1 = &zero,
582 .proc_handler = proc_dointvec_minmax
583 },
584 { }
585};
586
587static __net_init int sysctl_core_net_init(struct net *net)
588{
589 struct ctl_table *tbl;
590
591 tbl = netns_core_table;
592 if (!net_eq(net, &init_net)) {
593 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
594 if (tbl == NULL)
595 goto err_dup;
596
597 tbl[0].data = &net->core.sysctl_somaxconn;
598
599
600 if (net->user_ns != &init_user_ns) {
601 tbl[0].procname = NULL;
602 }
603 }
604
605 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
606 if (net->core.sysctl_hdr == NULL)
607 goto err_reg;
608
609 return 0;
610
611err_reg:
612 if (tbl != netns_core_table)
613 kfree(tbl);
614err_dup:
615 return -ENOMEM;
616}
617
618static __net_exit void sysctl_core_net_exit(struct net *net)
619{
620 struct ctl_table *tbl;
621
622 tbl = net->core.sysctl_hdr->ctl_table_arg;
623 unregister_net_sysctl_table(net->core.sysctl_hdr);
624 BUG_ON(tbl == netns_core_table);
625 kfree(tbl);
626}
627
628static __net_initdata struct pernet_operations sysctl_core_ops = {
629 .init = sysctl_core_net_init,
630 .exit = sysctl_core_net_exit,
631};
632
633static __init int sysctl_core_init(void)
634{
635 register_net_sysctl(&init_net, "net/core", net_core_table);
636 return register_pernet_subsys(&sysctl_core_ops);
637}
638
639fs_initcall(sysctl_core_init);
640
