This source file includes following definitions.
- rps_sock_flow_sysctl
- flow_limit_cpu_sysctl
- flow_limit_table_len_sysctl
- set_default_qdisc
- proc_do_dev_weight
- proc_do_rss_key
- proc_dointvec_minmax_bpf_enable
- proc_dointvec_minmax_bpf_restricted
- proc_dolongvec_minmax_bpf_restricted
- sysctl_core_net_init
- sysctl_core_net_exit
- sysctl_core_init
1
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7
8
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
25 static int two __maybe_unused = 2;
26 static int min_sndbuf = SOCK_MIN_SNDBUF;
27 static int min_rcvbuf = SOCK_MIN_RCVBUF;
28 static int max_skb_frags = MAX_SKB_FRAGS;
29 static long long_one __maybe_unused = 1;
30 static long long_max __maybe_unused = LONG_MAX;
31
32 static int net_msg_warn;
33
34 int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
35 EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
36
37
38
39
40
41
42
43 int sysctl_devconf_inherit_init_net __read_mostly;
44 EXPORT_SYMBOL(sysctl_devconf_inherit_init_net);
45
46 #ifdef CONFIG_RPS
47 static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
48 void __user *buffer, size_t *lenp, loff_t *ppos)
49 {
50 unsigned int orig_size, size;
51 int ret, i;
52 struct ctl_table tmp = {
53 .data = &size,
54 .maxlen = sizeof(size),
55 .mode = table->mode
56 };
57 struct rps_sock_flow_table *orig_sock_table, *sock_table;
58 static DEFINE_MUTEX(sock_flow_mutex);
59
60 mutex_lock(&sock_flow_mutex);
61
62 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
63 lockdep_is_held(&sock_flow_mutex));
64 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
65
66 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
67
68 if (write) {
69 if (size) {
70 if (size > 1<<29) {
71
72 mutex_unlock(&sock_flow_mutex);
73 return -EINVAL;
74 }
75 size = roundup_pow_of_two(size);
76 if (size != orig_size) {
77 sock_table =
78 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
79 if (!sock_table) {
80 mutex_unlock(&sock_flow_mutex);
81 return -ENOMEM;
82 }
83 rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
84 sock_table->mask = size - 1;
85 } else
86 sock_table = orig_sock_table;
87
88 for (i = 0; i < size; i++)
89 sock_table->ents[i] = RPS_NO_CPU;
90 } else
91 sock_table = NULL;
92
93 if (sock_table != orig_sock_table) {
94 rcu_assign_pointer(rps_sock_flow_table, sock_table);
95 if (sock_table) {
96 static_branch_inc(&rps_needed);
97 static_branch_inc(&rfs_needed);
98 }
99 if (orig_sock_table) {
100 static_branch_dec(&rps_needed);
101 static_branch_dec(&rfs_needed);
102 synchronize_rcu();
103 vfree(orig_sock_table);
104 }
105 }
106 }
107
108 mutex_unlock(&sock_flow_mutex);
109
110 return ret;
111 }
112 #endif
113
114 #ifdef CONFIG_NET_FLOW_LIMIT
115 static DEFINE_MUTEX(flow_limit_update_mutex);
116
117 static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
118 void __user *buffer, size_t *lenp,
119 loff_t *ppos)
120 {
121 struct sd_flow_limit *cur;
122 struct softnet_data *sd;
123 cpumask_var_t mask;
124 int i, len, ret = 0;
125
126 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
127 return -ENOMEM;
128
129 if (write) {
130 ret = cpumask_parse_user(buffer, *lenp, mask);
131 if (ret)
132 goto done;
133
134 mutex_lock(&flow_limit_update_mutex);
135 len = sizeof(*cur) + netdev_flow_limit_table_len;
136 for_each_possible_cpu(i) {
137 sd = &per_cpu(softnet_data, i);
138 cur = rcu_dereference_protected(sd->flow_limit,
139 lockdep_is_held(&flow_limit_update_mutex));
140 if (cur && !cpumask_test_cpu(i, mask)) {
141 RCU_INIT_POINTER(sd->flow_limit, NULL);
142 synchronize_rcu();
143 kfree(cur);
144 } else if (!cur && cpumask_test_cpu(i, mask)) {
145 cur = kzalloc_node(len, GFP_KERNEL,
146 cpu_to_node(i));
147 if (!cur) {
148
149 ret = -ENOMEM;
150 goto write_unlock;
151 }
152 cur->num_buckets = netdev_flow_limit_table_len;
153 rcu_assign_pointer(sd->flow_limit, cur);
154 }
155 }
156 write_unlock:
157 mutex_unlock(&flow_limit_update_mutex);
158 } else {
159 char kbuf[128];
160
161 if (*ppos || !*lenp) {
162 *lenp = 0;
163 goto done;
164 }
165
166 cpumask_clear(mask);
167 rcu_read_lock();
168 for_each_possible_cpu(i) {
169 sd = &per_cpu(softnet_data, i);
170 if (rcu_dereference(sd->flow_limit))
171 cpumask_set_cpu(i, mask);
172 }
173 rcu_read_unlock();
174
175 len = min(sizeof(kbuf) - 1, *lenp);
176 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
177 if (!len) {
178 *lenp = 0;
179 goto done;
180 }
181 if (len < *lenp)
182 kbuf[len++] = '\n';
183 if (copy_to_user(buffer, kbuf, len)) {
184 ret = -EFAULT;
185 goto done;
186 }
187 *lenp = len;
188 *ppos += len;
189 }
190
191 done:
192 free_cpumask_var(mask);
193 return ret;
194 }
195
196 static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
197 void __user *buffer, size_t *lenp,
198 loff_t *ppos)
199 {
200 unsigned int old, *ptr;
201 int ret;
202
203 mutex_lock(&flow_limit_update_mutex);
204
205 ptr = table->data;
206 old = *ptr;
207 ret = proc_dointvec(table, write, buffer, lenp, ppos);
208 if (!ret && write && !is_power_of_2(*ptr)) {
209 *ptr = old;
210 ret = -EINVAL;
211 }
212
213 mutex_unlock(&flow_limit_update_mutex);
214 return ret;
215 }
216 #endif
217
218 #ifdef CONFIG_NET_SCHED
219 static int set_default_qdisc(struct ctl_table *table, int write,
220 void __user *buffer, size_t *lenp, loff_t *ppos)
221 {
222 char id[IFNAMSIZ];
223 struct ctl_table tbl = {
224 .data = id,
225 .maxlen = IFNAMSIZ,
226 };
227 int ret;
228
229 qdisc_get_default(id, IFNAMSIZ);
230
231 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
232 if (write && ret == 0)
233 ret = qdisc_set_default(id);
234 return ret;
235 }
236 #endif
237
238 static int proc_do_dev_weight(struct ctl_table *table, int write,
239 void __user *buffer, size_t *lenp, loff_t *ppos)
240 {
241 int ret;
242
243 ret = proc_dointvec(table, write, buffer, lenp, ppos);
244 if (ret != 0)
245 return ret;
246
247 dev_rx_weight = weight_p * dev_weight_rx_bias;
248 dev_tx_weight = weight_p * dev_weight_tx_bias;
249
250 return ret;
251 }
252
253 static int proc_do_rss_key(struct ctl_table *table, int write,
254 void __user *buffer, size_t *lenp, loff_t *ppos)
255 {
256 struct ctl_table fake_table;
257 char buf[NETDEV_RSS_KEY_LEN * 3];
258
259 snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
260 fake_table.data = buf;
261 fake_table.maxlen = sizeof(buf);
262 return proc_dostring(&fake_table, write, buffer, lenp, ppos);
263 }
264
265 #ifdef CONFIG_BPF_JIT
266 static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
267 void __user *buffer, size_t *lenp,
268 loff_t *ppos)
269 {
270 int ret, jit_enable = *(int *)table->data;
271 struct ctl_table tmp = *table;
272
273 if (write && !capable(CAP_SYS_ADMIN))
274 return -EPERM;
275
276 tmp.data = &jit_enable;
277 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
278 if (write && !ret) {
279 if (jit_enable < 2 ||
280 (jit_enable == 2 && bpf_dump_raw_ok())) {
281 *(int *)table->data = jit_enable;
282 if (jit_enable == 2)
283 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
284 } else {
285 ret = -EPERM;
286 }
287 }
288 return ret;
289 }
290
291 # ifdef CONFIG_HAVE_EBPF_JIT
292 static int
293 proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
294 void __user *buffer, size_t *lenp,
295 loff_t *ppos)
296 {
297 if (!capable(CAP_SYS_ADMIN))
298 return -EPERM;
299
300 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
301 }
302 # endif
303
304 static int
305 proc_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
316 static 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 = SYSCTL_ONE,
394 .extra2 = SYSCTL_ONE,
395 # else
396 .extra1 = SYSCTL_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 = SYSCTL_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 = SYSCTL_ZERO,
417 .extra2 = SYSCTL_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 = SYSCTL_ZERO,
465 .extra2 = SYSCTL_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 = SYSCTL_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 = SYSCTL_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 = SYSCTL_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 = SYSCTL_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 = SYSCTL_ZERO,
554 .extra2 = SYSCTL_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 = SYSCTL_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 .procname = "gro_normal_batch",
574 .data = &gro_normal_batch,
575 .maxlen = sizeof(unsigned int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec_minmax,
578 .extra1 = SYSCTL_ONE,
579 },
580 { }
581 };
582
583 static struct ctl_table netns_core_table[] = {
584 {
585 .procname = "somaxconn",
586 .data = &init_net.core.sysctl_somaxconn,
587 .maxlen = sizeof(int),
588 .mode = 0644,
589 .extra1 = SYSCTL_ZERO,
590 .proc_handler = proc_dointvec_minmax
591 },
592 { }
593 };
594
595 static __net_init int sysctl_core_net_init(struct net *net)
596 {
597 struct ctl_table *tbl;
598
599 tbl = netns_core_table;
600 if (!net_eq(net, &init_net)) {
601 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
602 if (tbl == NULL)
603 goto err_dup;
604
605 tbl[0].data = &net->core.sysctl_somaxconn;
606
607
608 if (net->user_ns != &init_user_ns) {
609 tbl[0].procname = NULL;
610 }
611 }
612
613 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
614 if (net->core.sysctl_hdr == NULL)
615 goto err_reg;
616
617 return 0;
618
619 err_reg:
620 if (tbl != netns_core_table)
621 kfree(tbl);
622 err_dup:
623 return -ENOMEM;
624 }
625
626 static __net_exit void sysctl_core_net_exit(struct net *net)
627 {
628 struct ctl_table *tbl;
629
630 tbl = net->core.sysctl_hdr->ctl_table_arg;
631 unregister_net_sysctl_table(net->core.sysctl_hdr);
632 BUG_ON(tbl == netns_core_table);
633 kfree(tbl);
634 }
635
636 static __net_initdata struct pernet_operations sysctl_core_ops = {
637 .init = sysctl_core_net_init,
638 .exit = sysctl_core_net_exit,
639 };
640
641 static __init int sysctl_core_init(void)
642 {
643 register_net_sysctl(&init_net, "net/core", net_core_table);
644 return register_pernet_subsys(&sysctl_core_ops);
645 }
646
647 fs_initcall(sysctl_core_init);