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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 two __maybe_unused = 2;
26static int min_sndbuf = SOCK_MIN_SNDBUF;
27static int min_rcvbuf = SOCK_MIN_RCVBUF;
28static int max_skb_frags = MAX_SKB_FRAGS;
29static long long_one __maybe_unused = 1;
30static long long_max __maybe_unused = LONG_MAX;
31
32static int net_msg_warn;
33
34int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
35EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
36
37#ifdef CONFIG_RPS
38static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
39 void __user *buffer, size_t *lenp, loff_t *ppos)
40{
41 unsigned int orig_size, size;
42 int ret, i;
43 struct ctl_table tmp = {
44 .data = &size,
45 .maxlen = sizeof(size),
46 .mode = table->mode
47 };
48 struct rps_sock_flow_table *orig_sock_table, *sock_table;
49 static DEFINE_MUTEX(sock_flow_mutex);
50
51 mutex_lock(&sock_flow_mutex);
52
53 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
54 lockdep_is_held(&sock_flow_mutex));
55 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
56
57 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
58
59 if (write) {
60 if (size) {
61 if (size > 1<<29) {
62
63 mutex_unlock(&sock_flow_mutex);
64 return -EINVAL;
65 }
66 size = roundup_pow_of_two(size);
67 if (size != orig_size) {
68 sock_table =
69 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
70 if (!sock_table) {
71 mutex_unlock(&sock_flow_mutex);
72 return -ENOMEM;
73 }
74 rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
75 sock_table->mask = size - 1;
76 } else
77 sock_table = orig_sock_table;
78
79 for (i = 0; i < size; i++)
80 sock_table->ents[i] = RPS_NO_CPU;
81 } else
82 sock_table = NULL;
83
84 if (sock_table != orig_sock_table) {
85 rcu_assign_pointer(rps_sock_flow_table, sock_table);
86 if (sock_table) {
87 static_branch_inc(&rps_needed);
88 static_branch_inc(&rfs_needed);
89 }
90 if (orig_sock_table) {
91 static_branch_dec(&rps_needed);
92 static_branch_dec(&rfs_needed);
93 synchronize_rcu();
94 vfree(orig_sock_table);
95 }
96 }
97 }
98
99 mutex_unlock(&sock_flow_mutex);
100
101 return ret;
102}
103#endif
104
105#ifdef CONFIG_NET_FLOW_LIMIT
106static DEFINE_MUTEX(flow_limit_update_mutex);
107
108static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
109 void __user *buffer, size_t *lenp,
110 loff_t *ppos)
111{
112 struct sd_flow_limit *cur;
113 struct softnet_data *sd;
114 cpumask_var_t mask;
115 int i, len, ret = 0;
116
117 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
118 return -ENOMEM;
119
120 if (write) {
121 ret = cpumask_parse_user(buffer, *lenp, mask);
122 if (ret)
123 goto done;
124
125 mutex_lock(&flow_limit_update_mutex);
126 len = sizeof(*cur) + netdev_flow_limit_table_len;
127 for_each_possible_cpu(i) {
128 sd = &per_cpu(softnet_data, i);
129 cur = rcu_dereference_protected(sd->flow_limit,
130 lockdep_is_held(&flow_limit_update_mutex));
131 if (cur && !cpumask_test_cpu(i, mask)) {
132 RCU_INIT_POINTER(sd->flow_limit, NULL);
133 synchronize_rcu();
134 kfree(cur);
135 } else if (!cur && cpumask_test_cpu(i, mask)) {
136 cur = kzalloc_node(len, GFP_KERNEL,
137 cpu_to_node(i));
138 if (!cur) {
139
140 ret = -ENOMEM;
141 goto write_unlock;
142 }
143 cur->num_buckets = netdev_flow_limit_table_len;
144 rcu_assign_pointer(sd->flow_limit, cur);
145 }
146 }
147write_unlock:
148 mutex_unlock(&flow_limit_update_mutex);
149 } else {
150 char kbuf[128];
151
152 if (*ppos || !*lenp) {
153 *lenp = 0;
154 goto done;
155 }
156
157 cpumask_clear(mask);
158 rcu_read_lock();
159 for_each_possible_cpu(i) {
160 sd = &per_cpu(softnet_data, i);
161 if (rcu_dereference(sd->flow_limit))
162 cpumask_set_cpu(i, mask);
163 }
164 rcu_read_unlock();
165
166 len = min(sizeof(kbuf) - 1, *lenp);
167 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
168 if (!len) {
169 *lenp = 0;
170 goto done;
171 }
172 if (len < *lenp)
173 kbuf[len++] = '\n';
174 if (copy_to_user(buffer, kbuf, len)) {
175 ret = -EFAULT;
176 goto done;
177 }
178 *lenp = len;
179 *ppos += len;
180 }
181
182done:
183 free_cpumask_var(mask);
184 return ret;
185}
186
187static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
188 void __user *buffer, size_t *lenp,
189 loff_t *ppos)
190{
191 unsigned int old, *ptr;
192 int ret;
193
194 mutex_lock(&flow_limit_update_mutex);
195
196 ptr = table->data;
197 old = *ptr;
198 ret = proc_dointvec(table, write, buffer, lenp, ppos);
199 if (!ret && write && !is_power_of_2(*ptr)) {
200 *ptr = old;
201 ret = -EINVAL;
202 }
203
204 mutex_unlock(&flow_limit_update_mutex);
205 return ret;
206}
207#endif
208
209#ifdef CONFIG_NET_SCHED
210static int set_default_qdisc(struct ctl_table *table, int write,
211 void __user *buffer, size_t *lenp, loff_t *ppos)
212{
213 char id[IFNAMSIZ];
214 struct ctl_table tbl = {
215 .data = id,
216 .maxlen = IFNAMSIZ,
217 };
218 int ret;
219
220 qdisc_get_default(id, IFNAMSIZ);
221
222 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
223 if (write && ret == 0)
224 ret = qdisc_set_default(id);
225 return ret;
226}
227#endif
228
229static int proc_do_dev_weight(struct ctl_table *table, int write,
230 void __user *buffer, size_t *lenp, loff_t *ppos)
231{
232 int ret;
233
234 ret = proc_dointvec(table, write, buffer, lenp, ppos);
235 if (ret != 0)
236 return ret;
237
238 dev_rx_weight = weight_p * dev_weight_rx_bias;
239 dev_tx_weight = weight_p * dev_weight_tx_bias;
240
241 return ret;
242}
243
244static int proc_do_rss_key(struct ctl_table *table, int write,
245 void __user *buffer, size_t *lenp, loff_t *ppos)
246{
247 struct ctl_table fake_table;
248 char buf[NETDEV_RSS_KEY_LEN * 3];
249
250 snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
251 fake_table.data = buf;
252 fake_table.maxlen = sizeof(buf);
253 return proc_dostring(&fake_table, write, buffer, lenp, ppos);
254}
255
256#ifdef CONFIG_BPF_JIT
257static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
258 void __user *buffer, size_t *lenp,
259 loff_t *ppos)
260{
261 int ret, jit_enable = *(int *)table->data;
262 struct ctl_table tmp = *table;
263
264 if (write && !capable(CAP_SYS_ADMIN))
265 return -EPERM;
266
267 tmp.data = &jit_enable;
268 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
269 if (write && !ret) {
270 if (jit_enable < 2 ||
271 (jit_enable == 2 && bpf_dump_raw_ok())) {
272 *(int *)table->data = jit_enable;
273 if (jit_enable == 2)
274 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
275 } else {
276 ret = -EPERM;
277 }
278 }
279 return ret;
280}
281
282static int
283proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
284 void __user *buffer, size_t *lenp,
285 loff_t *ppos)
286{
287 if (!capable(CAP_SYS_ADMIN))
288 return -EPERM;
289
290 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
291}
292
293static int
294proc_dolongvec_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_doulongvec_minmax(table, write, buffer, lenp, ppos);
302}
303#endif
304
305static struct ctl_table net_core_table[] = {
306#ifdef CONFIG_NET
307 {
308 .procname = "wmem_max",
309 .data = &sysctl_wmem_max,
310 .maxlen = sizeof(int),
311 .mode = 0644,
312 .proc_handler = proc_dointvec_minmax,
313 .extra1 = &min_sndbuf,
314 },
315 {
316 .procname = "rmem_max",
317 .data = &sysctl_rmem_max,
318 .maxlen = sizeof(int),
319 .mode = 0644,
320 .proc_handler = proc_dointvec_minmax,
321 .extra1 = &min_rcvbuf,
322 },
323 {
324 .procname = "wmem_default",
325 .data = &sysctl_wmem_default,
326 .maxlen = sizeof(int),
327 .mode = 0644,
328 .proc_handler = proc_dointvec_minmax,
329 .extra1 = &min_sndbuf,
330 },
331 {
332 .procname = "rmem_default",
333 .data = &sysctl_rmem_default,
334 .maxlen = sizeof(int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec_minmax,
337 .extra1 = &min_rcvbuf,
338 },
339 {
340 .procname = "dev_weight",
341 .data = &weight_p,
342 .maxlen = sizeof(int),
343 .mode = 0644,
344 .proc_handler = proc_do_dev_weight,
345 },
346 {
347 .procname = "dev_weight_rx_bias",
348 .data = &dev_weight_rx_bias,
349 .maxlen = sizeof(int),
350 .mode = 0644,
351 .proc_handler = proc_do_dev_weight,
352 },
353 {
354 .procname = "dev_weight_tx_bias",
355 .data = &dev_weight_tx_bias,
356 .maxlen = sizeof(int),
357 .mode = 0644,
358 .proc_handler = proc_do_dev_weight,
359 },
360 {
361 .procname = "netdev_max_backlog",
362 .data = &netdev_max_backlog,
363 .maxlen = sizeof(int),
364 .mode = 0644,
365 .proc_handler = proc_dointvec
366 },
367 {
368 .procname = "netdev_rss_key",
369 .data = &netdev_rss_key,
370 .maxlen = sizeof(int),
371 .mode = 0444,
372 .proc_handler = proc_do_rss_key,
373 },
374#ifdef CONFIG_BPF_JIT
375 {
376 .procname = "bpf_jit_enable",
377 .data = &bpf_jit_enable,
378 .maxlen = sizeof(int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec_minmax_bpf_enable,
381# ifdef CONFIG_BPF_JIT_ALWAYS_ON
382 .extra1 = SYSCTL_ONE,
383 .extra2 = SYSCTL_ONE,
384# else
385 .extra1 = SYSCTL_ZERO,
386 .extra2 = &two,
387# endif
388 },
389# ifdef CONFIG_HAVE_EBPF_JIT
390 {
391 .procname = "bpf_jit_harden",
392 .data = &bpf_jit_harden,
393 .maxlen = sizeof(int),
394 .mode = 0600,
395 .proc_handler = proc_dointvec_minmax_bpf_restricted,
396 .extra1 = SYSCTL_ZERO,
397 .extra2 = &two,
398 },
399 {
400 .procname = "bpf_jit_kallsyms",
401 .data = &bpf_jit_kallsyms,
402 .maxlen = sizeof(int),
403 .mode = 0600,
404 .proc_handler = proc_dointvec_minmax_bpf_restricted,
405 .extra1 = SYSCTL_ZERO,
406 .extra2 = SYSCTL_ONE,
407 },
408# endif
409 {
410 .procname = "bpf_jit_limit",
411 .data = &bpf_jit_limit,
412 .maxlen = sizeof(long),
413 .mode = 0600,
414 .proc_handler = proc_dolongvec_minmax_bpf_restricted,
415 .extra1 = &long_one,
416 .extra2 = &long_max,
417 },
418#endif
419 {
420 .procname = "netdev_tstamp_prequeue",
421 .data = &netdev_tstamp_prequeue,
422 .maxlen = sizeof(int),
423 .mode = 0644,
424 .proc_handler = proc_dointvec
425 },
426 {
427 .procname = "message_cost",
428 .data = &net_ratelimit_state.interval,
429 .maxlen = sizeof(int),
430 .mode = 0644,
431 .proc_handler = proc_dointvec_jiffies,
432 },
433 {
434 .procname = "message_burst",
435 .data = &net_ratelimit_state.burst,
436 .maxlen = sizeof(int),
437 .mode = 0644,
438 .proc_handler = proc_dointvec,
439 },
440 {
441 .procname = "optmem_max",
442 .data = &sysctl_optmem_max,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec
446 },
447 {
448 .procname = "tstamp_allow_data",
449 .data = &sysctl_tstamp_allow_data,
450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = proc_dointvec_minmax,
453 .extra1 = SYSCTL_ZERO,
454 .extra2 = SYSCTL_ONE
455 },
456#ifdef CONFIG_RPS
457 {
458 .procname = "rps_sock_flow_entries",
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = rps_sock_flow_sysctl
462 },
463#endif
464#ifdef CONFIG_NET_FLOW_LIMIT
465 {
466 .procname = "flow_limit_cpu_bitmap",
467 .mode = 0644,
468 .proc_handler = flow_limit_cpu_sysctl
469 },
470 {
471 .procname = "flow_limit_table_len",
472 .data = &netdev_flow_limit_table_len,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = flow_limit_table_len_sysctl
476 },
477#endif
478#ifdef CONFIG_NET_RX_BUSY_POLL
479 {
480 .procname = "busy_poll",
481 .data = &sysctl_net_busy_poll,
482 .maxlen = sizeof(unsigned int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec_minmax,
485 .extra1 = SYSCTL_ZERO,
486 },
487 {
488 .procname = "busy_read",
489 .data = &sysctl_net_busy_read,
490 .maxlen = sizeof(unsigned int),
491 .mode = 0644,
492 .proc_handler = proc_dointvec_minmax,
493 .extra1 = SYSCTL_ZERO,
494 },
495#endif
496#ifdef CONFIG_NET_SCHED
497 {
498 .procname = "default_qdisc",
499 .mode = 0644,
500 .maxlen = IFNAMSIZ,
501 .proc_handler = set_default_qdisc
502 },
503#endif
504#endif
505 {
506 .procname = "netdev_budget",
507 .data = &netdev_budget,
508 .maxlen = sizeof(int),
509 .mode = 0644,
510 .proc_handler = proc_dointvec
511 },
512 {
513 .procname = "warnings",
514 .data = &net_msg_warn,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec
518 },
519 {
520 .procname = "max_skb_frags",
521 .data = &sysctl_max_skb_frags,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec_minmax,
525 .extra1 = SYSCTL_ONE,
526 .extra2 = &max_skb_frags,
527 },
528 {
529 .procname = "netdev_budget_usecs",
530 .data = &netdev_budget_usecs,
531 .maxlen = sizeof(unsigned int),
532 .mode = 0644,
533 .proc_handler = proc_dointvec_minmax,
534 .extra1 = SYSCTL_ZERO,
535 },
536 {
537 .procname = "fb_tunnels_only_for_init_net",
538 .data = &sysctl_fb_tunnels_only_for_init_net,
539 .maxlen = sizeof(int),
540 .mode = 0644,
541 .proc_handler = proc_dointvec_minmax,
542 .extra1 = SYSCTL_ZERO,
543 .extra2 = SYSCTL_ONE,
544 },
545 { }
546};
547
548static struct ctl_table netns_core_table[] = {
549 {
550 .procname = "somaxconn",
551 .data = &init_net.core.sysctl_somaxconn,
552 .maxlen = sizeof(int),
553 .mode = 0644,
554 .extra1 = SYSCTL_ZERO,
555 .proc_handler = proc_dointvec_minmax
556 },
557 { }
558};
559
560static __net_init int sysctl_core_net_init(struct net *net)
561{
562 struct ctl_table *tbl;
563
564 tbl = netns_core_table;
565 if (!net_eq(net, &init_net)) {
566 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
567 if (tbl == NULL)
568 goto err_dup;
569
570 tbl[0].data = &net->core.sysctl_somaxconn;
571
572
573 if (net->user_ns != &init_user_ns) {
574 tbl[0].procname = NULL;
575 }
576 }
577
578 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
579 if (net->core.sysctl_hdr == NULL)
580 goto err_reg;
581
582 return 0;
583
584err_reg:
585 if (tbl != netns_core_table)
586 kfree(tbl);
587err_dup:
588 return -ENOMEM;
589}
590
591static __net_exit void sysctl_core_net_exit(struct net *net)
592{
593 struct ctl_table *tbl;
594
595 tbl = net->core.sysctl_hdr->ctl_table_arg;
596 unregister_net_sysctl_table(net->core.sysctl_hdr);
597 BUG_ON(tbl == netns_core_table);
598 kfree(tbl);
599}
600
601static __net_initdata struct pernet_operations sysctl_core_ops = {
602 .init = sysctl_core_net_init,
603 .exit = sysctl_core_net_exit,
604};
605
606static __init int sysctl_core_init(void)
607{
608 register_net_sysctl(&init_net, "net/core", net_core_table);
609 return register_pernet_subsys(&sysctl_core_ops);
610}
611
612fs_initcall(sysctl_core_init);
613
