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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#ifdef CONFIG_RPS
40static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
41 void __user *buffer, size_t *lenp, loff_t *ppos)
42{
43 unsigned int orig_size, size;
44 int ret, i;
45 struct ctl_table tmp = {
46 .data = &size,
47 .maxlen = sizeof(size),
48 .mode = table->mode
49 };
50 struct rps_sock_flow_table *orig_sock_table, *sock_table;
51 static DEFINE_MUTEX(sock_flow_mutex);
52
53 mutex_lock(&sock_flow_mutex);
54
55 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
56 lockdep_is_held(&sock_flow_mutex));
57 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
58
59 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
60
61 if (write) {
62 if (size) {
63 if (size > 1<<29) {
64
65 mutex_unlock(&sock_flow_mutex);
66 return -EINVAL;
67 }
68 size = roundup_pow_of_two(size);
69 if (size != orig_size) {
70 sock_table =
71 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
72 if (!sock_table) {
73 mutex_unlock(&sock_flow_mutex);
74 return -ENOMEM;
75 }
76 rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
77 sock_table->mask = size - 1;
78 } else
79 sock_table = orig_sock_table;
80
81 for (i = 0; i < size; i++)
82 sock_table->ents[i] = RPS_NO_CPU;
83 } else
84 sock_table = NULL;
85
86 if (sock_table != orig_sock_table) {
87 rcu_assign_pointer(rps_sock_flow_table, sock_table);
88 if (sock_table) {
89 static_key_slow_inc(&rps_needed);
90 static_key_slow_inc(&rfs_needed);
91 }
92 if (orig_sock_table) {
93 static_key_slow_dec(&rps_needed);
94 static_key_slow_dec(&rfs_needed);
95 synchronize_rcu();
96 vfree(orig_sock_table);
97 }
98 }
99 }
100
101 mutex_unlock(&sock_flow_mutex);
102
103 return ret;
104}
105#endif
106
107#ifdef CONFIG_NET_FLOW_LIMIT
108static DEFINE_MUTEX(flow_limit_update_mutex);
109
110static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
111 void __user *buffer, size_t *lenp,
112 loff_t *ppos)
113{
114 struct sd_flow_limit *cur;
115 struct softnet_data *sd;
116 cpumask_var_t mask;
117 int i, len, ret = 0;
118
119 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
120 return -ENOMEM;
121
122 if (write) {
123 ret = cpumask_parse_user(buffer, *lenp, mask);
124 if (ret)
125 goto done;
126
127 mutex_lock(&flow_limit_update_mutex);
128 len = sizeof(*cur) + netdev_flow_limit_table_len;
129 for_each_possible_cpu(i) {
130 sd = &per_cpu(softnet_data, i);
131 cur = rcu_dereference_protected(sd->flow_limit,
132 lockdep_is_held(&flow_limit_update_mutex));
133 if (cur && !cpumask_test_cpu(i, mask)) {
134 RCU_INIT_POINTER(sd->flow_limit, NULL);
135 synchronize_rcu();
136 kfree(cur);
137 } else if (!cur && cpumask_test_cpu(i, mask)) {
138 cur = kzalloc_node(len, GFP_KERNEL,
139 cpu_to_node(i));
140 if (!cur) {
141
142 ret = -ENOMEM;
143 goto write_unlock;
144 }
145 cur->num_buckets = netdev_flow_limit_table_len;
146 rcu_assign_pointer(sd->flow_limit, cur);
147 }
148 }
149write_unlock:
150 mutex_unlock(&flow_limit_update_mutex);
151 } else {
152 char kbuf[128];
153
154 if (*ppos || !*lenp) {
155 *lenp = 0;
156 goto done;
157 }
158
159 cpumask_clear(mask);
160 rcu_read_lock();
161 for_each_possible_cpu(i) {
162 sd = &per_cpu(softnet_data, i);
163 if (rcu_dereference(sd->flow_limit))
164 cpumask_set_cpu(i, mask);
165 }
166 rcu_read_unlock();
167
168 len = min(sizeof(kbuf) - 1, *lenp);
169 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
170 if (!len) {
171 *lenp = 0;
172 goto done;
173 }
174 if (len < *lenp)
175 kbuf[len++] = '\n';
176 if (copy_to_user(buffer, kbuf, len)) {
177 ret = -EFAULT;
178 goto done;
179 }
180 *lenp = len;
181 *ppos += len;
182 }
183
184done:
185 free_cpumask_var(mask);
186 return ret;
187}
188
189static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
190 void __user *buffer, size_t *lenp,
191 loff_t *ppos)
192{
193 unsigned int old, *ptr;
194 int ret;
195
196 mutex_lock(&flow_limit_update_mutex);
197
198 ptr = table->data;
199 old = *ptr;
200 ret = proc_dointvec(table, write, buffer, lenp, ppos);
201 if (!ret && write && !is_power_of_2(*ptr)) {
202 *ptr = old;
203 ret = -EINVAL;
204 }
205
206 mutex_unlock(&flow_limit_update_mutex);
207 return ret;
208}
209#endif
210
211#ifdef CONFIG_NET_SCHED
212static int set_default_qdisc(struct ctl_table *table, int write,
213 void __user *buffer, size_t *lenp, loff_t *ppos)
214{
215 char id[IFNAMSIZ];
216 struct ctl_table tbl = {
217 .data = id,
218 .maxlen = IFNAMSIZ,
219 };
220 int ret;
221
222 qdisc_get_default(id, IFNAMSIZ);
223
224 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
225 if (write && ret == 0)
226 ret = qdisc_set_default(id);
227 return ret;
228}
229#endif
230
231static int proc_do_dev_weight(struct ctl_table *table, int write,
232 void __user *buffer, size_t *lenp, loff_t *ppos)
233{
234 int ret;
235
236 ret = proc_dointvec(table, write, buffer, lenp, ppos);
237 if (ret != 0)
238 return ret;
239
240 dev_rx_weight = weight_p * dev_weight_rx_bias;
241 dev_tx_weight = weight_p * dev_weight_tx_bias;
242
243 return ret;
244}
245
246static int proc_do_rss_key(struct ctl_table *table, int write,
247 void __user *buffer, size_t *lenp, loff_t *ppos)
248{
249 struct ctl_table fake_table;
250 char buf[NETDEV_RSS_KEY_LEN * 3];
251
252 snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
253 fake_table.data = buf;
254 fake_table.maxlen = sizeof(buf);
255 return proc_dostring(&fake_table, write, buffer, lenp, ppos);
256}
257
258#ifdef CONFIG_BPF_JIT
259static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
260 void __user *buffer, size_t *lenp,
261 loff_t *ppos)
262{
263 int ret, jit_enable = *(int *)table->data;
264 struct ctl_table tmp = *table;
265
266 if (write && !capable(CAP_SYS_ADMIN))
267 return -EPERM;
268
269 tmp.data = &jit_enable;
270 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
271 if (write && !ret) {
272 if (jit_enable < 2 ||
273 (jit_enable == 2 && bpf_dump_raw_ok())) {
274 *(int *)table->data = jit_enable;
275 if (jit_enable == 2)
276 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
277 } else {
278 ret = -EPERM;
279 }
280 }
281 return ret;
282}
283
284static int
285proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
286 void __user *buffer, size_t *lenp,
287 loff_t *ppos)
288{
289 if (!capable(CAP_SYS_ADMIN))
290 return -EPERM;
291
292 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
293}
294
295static int
296proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,
297 void __user *buffer, size_t *lenp,
298 loff_t *ppos)
299{
300 if (!capable(CAP_SYS_ADMIN))
301 return -EPERM;
302
303 return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
304}
305#endif
306
307static struct ctl_table net_core_table[] = {
308#ifdef CONFIG_NET
309 {
310 .procname = "wmem_max",
311 .data = &sysctl_wmem_max,
312 .maxlen = sizeof(int),
313 .mode = 0644,
314 .proc_handler = proc_dointvec_minmax,
315 .extra1 = &min_sndbuf,
316 },
317 {
318 .procname = "rmem_max",
319 .data = &sysctl_rmem_max,
320 .maxlen = sizeof(int),
321 .mode = 0644,
322 .proc_handler = proc_dointvec_minmax,
323 .extra1 = &min_rcvbuf,
324 },
325 {
326 .procname = "wmem_default",
327 .data = &sysctl_wmem_default,
328 .maxlen = sizeof(int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec_minmax,
331 .extra1 = &min_sndbuf,
332 },
333 {
334 .procname = "rmem_default",
335 .data = &sysctl_rmem_default,
336 .maxlen = sizeof(int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec_minmax,
339 .extra1 = &min_rcvbuf,
340 },
341 {
342 .procname = "dev_weight",
343 .data = &weight_p,
344 .maxlen = sizeof(int),
345 .mode = 0644,
346 .proc_handler = proc_do_dev_weight,
347 },
348 {
349 .procname = "dev_weight_rx_bias",
350 .data = &dev_weight_rx_bias,
351 .maxlen = sizeof(int),
352 .mode = 0644,
353 .proc_handler = proc_do_dev_weight,
354 },
355 {
356 .procname = "dev_weight_tx_bias",
357 .data = &dev_weight_tx_bias,
358 .maxlen = sizeof(int),
359 .mode = 0644,
360 .proc_handler = proc_do_dev_weight,
361 },
362 {
363 .procname = "netdev_max_backlog",
364 .data = &netdev_max_backlog,
365 .maxlen = sizeof(int),
366 .mode = 0644,
367 .proc_handler = proc_dointvec
368 },
369 {
370 .procname = "netdev_rss_key",
371 .data = &netdev_rss_key,
372 .maxlen = sizeof(int),
373 .mode = 0444,
374 .proc_handler = proc_do_rss_key,
375 },
376#ifdef CONFIG_BPF_JIT
377 {
378 .procname = "bpf_jit_enable",
379 .data = &bpf_jit_enable,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec_minmax_bpf_enable,
383# ifdef CONFIG_BPF_JIT_ALWAYS_ON
384 .extra1 = &one,
385 .extra2 = &one,
386# else
387 .extra1 = &zero,
388 .extra2 = &two,
389# endif
390 },
391# ifdef CONFIG_HAVE_EBPF_JIT
392 {
393 .procname = "bpf_jit_harden",
394 .data = &bpf_jit_harden,
395 .maxlen = sizeof(int),
396 .mode = 0600,
397 .proc_handler = proc_dointvec_minmax_bpf_restricted,
398 .extra1 = &zero,
399 .extra2 = &two,
400 },
401 {
402 .procname = "bpf_jit_kallsyms",
403 .data = &bpf_jit_kallsyms,
404 .maxlen = sizeof(int),
405 .mode = 0600,
406 .proc_handler = proc_dointvec_minmax_bpf_restricted,
407 .extra1 = &zero,
408 .extra2 = &one,
409 },
410# endif
411 {
412 .procname = "bpf_jit_limit",
413 .data = &bpf_jit_limit,
414 .maxlen = sizeof(long),
415 .mode = 0600,
416 .proc_handler = proc_dolongvec_minmax_bpf_restricted,
417 .extra1 = &long_one,
418 .extra2 = &long_max,
419 },
420#endif
421 {
422 .procname = "netdev_tstamp_prequeue",
423 .data = &netdev_tstamp_prequeue,
424 .maxlen = sizeof(int),
425 .mode = 0644,
426 .proc_handler = proc_dointvec
427 },
428 {
429 .procname = "message_cost",
430 .data = &net_ratelimit_state.interval,
431 .maxlen = sizeof(int),
432 .mode = 0644,
433 .proc_handler = proc_dointvec_jiffies,
434 },
435 {
436 .procname = "message_burst",
437 .data = &net_ratelimit_state.burst,
438 .maxlen = sizeof(int),
439 .mode = 0644,
440 .proc_handler = proc_dointvec,
441 },
442 {
443 .procname = "optmem_max",
444 .data = &sysctl_optmem_max,
445 .maxlen = sizeof(int),
446 .mode = 0644,
447 .proc_handler = proc_dointvec
448 },
449 {
450 .procname = "tstamp_allow_data",
451 .data = &sysctl_tstamp_allow_data,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec_minmax,
455 .extra1 = &zero,
456 .extra2 = &one
457 },
458#ifdef CONFIG_RPS
459 {
460 .procname = "rps_sock_flow_entries",
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = rps_sock_flow_sysctl
464 },
465#endif
466#ifdef CONFIG_NET_FLOW_LIMIT
467 {
468 .procname = "flow_limit_cpu_bitmap",
469 .mode = 0644,
470 .proc_handler = flow_limit_cpu_sysctl
471 },
472 {
473 .procname = "flow_limit_table_len",
474 .data = &netdev_flow_limit_table_len,
475 .maxlen = sizeof(int),
476 .mode = 0644,
477 .proc_handler = flow_limit_table_len_sysctl
478 },
479#endif
480#ifdef CONFIG_NET_RX_BUSY_POLL
481 {
482 .procname = "busy_poll",
483 .data = &sysctl_net_busy_poll,
484 .maxlen = sizeof(unsigned int),
485 .mode = 0644,
486 .proc_handler = proc_dointvec_minmax,
487 .extra1 = &zero,
488 },
489 {
490 .procname = "busy_read",
491 .data = &sysctl_net_busy_read,
492 .maxlen = sizeof(unsigned int),
493 .mode = 0644,
494 .proc_handler = proc_dointvec_minmax,
495 .extra1 = &zero,
496 },
497#endif
498#ifdef CONFIG_NET_SCHED
499 {
500 .procname = "default_qdisc",
501 .mode = 0644,
502 .maxlen = IFNAMSIZ,
503 .proc_handler = set_default_qdisc
504 },
505#endif
506#endif
507 {
508 .procname = "netdev_budget",
509 .data = &netdev_budget,
510 .maxlen = sizeof(int),
511 .mode = 0644,
512 .proc_handler = proc_dointvec
513 },
514 {
515 .procname = "warnings",
516 .data = &net_msg_warn,
517 .maxlen = sizeof(int),
518 .mode = 0644,
519 .proc_handler = proc_dointvec
520 },
521 {
522 .procname = "max_skb_frags",
523 .data = &sysctl_max_skb_frags,
524 .maxlen = sizeof(int),
525 .mode = 0644,
526 .proc_handler = proc_dointvec_minmax,
527 .extra1 = &one,
528 .extra2 = &max_skb_frags,
529 },
530 {
531 .procname = "netdev_budget_usecs",
532 .data = &netdev_budget_usecs,
533 .maxlen = sizeof(unsigned int),
534 .mode = 0644,
535 .proc_handler = proc_dointvec_minmax,
536 .extra1 = &zero,
537 },
538 {
539 .procname = "fb_tunnels_only_for_init_net",
540 .data = &sysctl_fb_tunnels_only_for_init_net,
541 .maxlen = sizeof(int),
542 .mode = 0644,
543 .proc_handler = proc_dointvec_minmax,
544 .extra1 = &zero,
545 .extra2 = &one,
546 },
547 { }
548};
549
550static struct ctl_table netns_core_table[] = {
551 {
552 .procname = "somaxconn",
553 .data = &init_net.core.sysctl_somaxconn,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 .extra1 = &zero,
557 .proc_handler = proc_dointvec_minmax
558 },
559 { }
560};
561
562static __net_init int sysctl_core_net_init(struct net *net)
563{
564 struct ctl_table *tbl;
565
566 tbl = netns_core_table;
567 if (!net_eq(net, &init_net)) {
568 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
569 if (tbl == NULL)
570 goto err_dup;
571
572 tbl[0].data = &net->core.sysctl_somaxconn;
573
574
575 if (net->user_ns != &init_user_ns) {
576 tbl[0].procname = NULL;
577 }
578 }
579
580 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
581 if (net->core.sysctl_hdr == NULL)
582 goto err_reg;
583
584 return 0;
585
586err_reg:
587 if (tbl != netns_core_table)
588 kfree(tbl);
589err_dup:
590 return -ENOMEM;
591}
592
593static __net_exit void sysctl_core_net_exit(struct net *net)
594{
595 struct ctl_table *tbl;
596
597 tbl = net->core.sysctl_hdr->ctl_table_arg;
598 unregister_net_sysctl_table(net->core.sysctl_hdr);
599 BUG_ON(tbl == netns_core_table);
600 kfree(tbl);
601}
602
603static __net_initdata struct pernet_operations sysctl_core_ops = {
604 .init = sysctl_core_net_init,
605 .exit = sysctl_core_net_exit,
606};
607
608static __init int sysctl_core_init(void)
609{
610 register_net_sysctl(&init_net, "net/core", net_core_table);
611 return register_pernet_subsys(&sysctl_core_ops);
612}
613
614fs_initcall(sysctl_core_init);
615
