drm/amdgpu/vg20:Restruct uvd to support multiple uvds
[muen/linux.git] / net / core / sysctl_net_core.c
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/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 zero = 0;
26 static int one = 1;
27 static int two __maybe_unused = 2;
28 static int min_sndbuf = SOCK_MIN_SNDBUF;
29 static int min_rcvbuf = SOCK_MIN_RCVBUF;
30 static int max_skb_frags = MAX_SKB_FRAGS;
31
32 static int net_msg_warn;        /* Unused, but still a sysctl */
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 #ifdef CONFIG_RPS
38 static 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                                 /* Enforce limit to prevent overflow */
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_key_slow_inc(&rps_needed);
88                                 static_key_slow_inc(&rfs_needed);
89                         }
90                         if (orig_sock_table) {
91                                 static_key_slow_dec(&rps_needed);
92                                 static_key_slow_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 /* CONFIG_RPS */
104
105 #ifdef CONFIG_NET_FLOW_LIMIT
106 static DEFINE_MUTEX(flow_limit_update_mutex);
107
108 static 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                                         /* not unwinding previous changes */
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                 }
147 write_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
182 done:
183         free_cpumask_var(mask);
184         return ret;
185 }
186
187 static 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 /* CONFIG_NET_FLOW_LIMIT */
208
209 #ifdef CONFIG_NET_SCHED
210 static 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
229 static 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
244 static 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
257 static 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
282 # ifdef CONFIG_HAVE_EBPF_JIT
283 static int
284 proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
285                                     void __user *buffer, size_t *lenp,
286                                     loff_t *ppos)
287 {
288         if (!capable(CAP_SYS_ADMIN))
289                 return -EPERM;
290
291         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
292 }
293 # endif
294 #endif
295
296 static struct ctl_table net_core_table[] = {
297 #ifdef CONFIG_NET
298         {
299                 .procname       = "wmem_max",
300                 .data           = &sysctl_wmem_max,
301                 .maxlen         = sizeof(int),
302                 .mode           = 0644,
303                 .proc_handler   = proc_dointvec_minmax,
304                 .extra1         = &min_sndbuf,
305         },
306         {
307                 .procname       = "rmem_max",
308                 .data           = &sysctl_rmem_max,
309                 .maxlen         = sizeof(int),
310                 .mode           = 0644,
311                 .proc_handler   = proc_dointvec_minmax,
312                 .extra1         = &min_rcvbuf,
313         },
314         {
315                 .procname       = "wmem_default",
316                 .data           = &sysctl_wmem_default,
317                 .maxlen         = sizeof(int),
318                 .mode           = 0644,
319                 .proc_handler   = proc_dointvec_minmax,
320                 .extra1         = &min_sndbuf,
321         },
322         {
323                 .procname       = "rmem_default",
324                 .data           = &sysctl_rmem_default,
325                 .maxlen         = sizeof(int),
326                 .mode           = 0644,
327                 .proc_handler   = proc_dointvec_minmax,
328                 .extra1         = &min_rcvbuf,
329         },
330         {
331                 .procname       = "dev_weight",
332                 .data           = &weight_p,
333                 .maxlen         = sizeof(int),
334                 .mode           = 0644,
335                 .proc_handler   = proc_do_dev_weight,
336         },
337         {
338                 .procname       = "dev_weight_rx_bias",
339                 .data           = &dev_weight_rx_bias,
340                 .maxlen         = sizeof(int),
341                 .mode           = 0644,
342                 .proc_handler   = proc_do_dev_weight,
343         },
344         {
345                 .procname       = "dev_weight_tx_bias",
346                 .data           = &dev_weight_tx_bias,
347                 .maxlen         = sizeof(int),
348                 .mode           = 0644,
349                 .proc_handler   = proc_do_dev_weight,
350         },
351         {
352                 .procname       = "netdev_max_backlog",
353                 .data           = &netdev_max_backlog,
354                 .maxlen         = sizeof(int),
355                 .mode           = 0644,
356                 .proc_handler   = proc_dointvec
357         },
358         {
359                 .procname       = "netdev_rss_key",
360                 .data           = &netdev_rss_key,
361                 .maxlen         = sizeof(int),
362                 .mode           = 0444,
363                 .proc_handler   = proc_do_rss_key,
364         },
365 #ifdef CONFIG_BPF_JIT
366         {
367                 .procname       = "bpf_jit_enable",
368                 .data           = &bpf_jit_enable,
369                 .maxlen         = sizeof(int),
370                 .mode           = 0644,
371                 .proc_handler   = proc_dointvec_minmax_bpf_enable,
372 # ifdef CONFIG_BPF_JIT_ALWAYS_ON
373                 .extra1         = &one,
374                 .extra2         = &one,
375 # else
376                 .extra1         = &zero,
377                 .extra2         = &two,
378 # endif
379         },
380 # ifdef CONFIG_HAVE_EBPF_JIT
381         {
382                 .procname       = "bpf_jit_harden",
383                 .data           = &bpf_jit_harden,
384                 .maxlen         = sizeof(int),
385                 .mode           = 0600,
386                 .proc_handler   = proc_dointvec_minmax_bpf_restricted,
387                 .extra1         = &zero,
388                 .extra2         = &two,
389         },
390         {
391                 .procname       = "bpf_jit_kallsyms",
392                 .data           = &bpf_jit_kallsyms,
393                 .maxlen         = sizeof(int),
394                 .mode           = 0600,
395                 .proc_handler   = proc_dointvec_minmax_bpf_restricted,
396                 .extra1         = &zero,
397                 .extra2         = &one,
398         },
399 # endif
400 #endif
401         {
402                 .procname       = "netdev_tstamp_prequeue",
403                 .data           = &netdev_tstamp_prequeue,
404                 .maxlen         = sizeof(int),
405                 .mode           = 0644,
406                 .proc_handler   = proc_dointvec
407         },
408         {
409                 .procname       = "message_cost",
410                 .data           = &net_ratelimit_state.interval,
411                 .maxlen         = sizeof(int),
412                 .mode           = 0644,
413                 .proc_handler   = proc_dointvec_jiffies,
414         },
415         {
416                 .procname       = "message_burst",
417                 .data           = &net_ratelimit_state.burst,
418                 .maxlen         = sizeof(int),
419                 .mode           = 0644,
420                 .proc_handler   = proc_dointvec,
421         },
422         {
423                 .procname       = "optmem_max",
424                 .data           = &sysctl_optmem_max,
425                 .maxlen         = sizeof(int),
426                 .mode           = 0644,
427                 .proc_handler   = proc_dointvec
428         },
429         {
430                 .procname       = "tstamp_allow_data",
431                 .data           = &sysctl_tstamp_allow_data,
432                 .maxlen         = sizeof(int),
433                 .mode           = 0644,
434                 .proc_handler   = proc_dointvec_minmax,
435                 .extra1         = &zero,
436                 .extra2         = &one
437         },
438 #ifdef CONFIG_RPS
439         {
440                 .procname       = "rps_sock_flow_entries",
441                 .maxlen         = sizeof(int),
442                 .mode           = 0644,
443                 .proc_handler   = rps_sock_flow_sysctl
444         },
445 #endif
446 #ifdef CONFIG_NET_FLOW_LIMIT
447         {
448                 .procname       = "flow_limit_cpu_bitmap",
449                 .mode           = 0644,
450                 .proc_handler   = flow_limit_cpu_sysctl
451         },
452         {
453                 .procname       = "flow_limit_table_len",
454                 .data           = &netdev_flow_limit_table_len,
455                 .maxlen         = sizeof(int),
456                 .mode           = 0644,
457                 .proc_handler   = flow_limit_table_len_sysctl
458         },
459 #endif /* CONFIG_NET_FLOW_LIMIT */
460 #ifdef CONFIG_NET_RX_BUSY_POLL
461         {
462                 .procname       = "busy_poll",
463                 .data           = &sysctl_net_busy_poll,
464                 .maxlen         = sizeof(unsigned int),
465                 .mode           = 0644,
466                 .proc_handler   = proc_dointvec_minmax,
467                 .extra1         = &zero,
468         },
469         {
470                 .procname       = "busy_read",
471                 .data           = &sysctl_net_busy_read,
472                 .maxlen         = sizeof(unsigned int),
473                 .mode           = 0644,
474                 .proc_handler   = proc_dointvec_minmax,
475                 .extra1         = &zero,
476         },
477 #endif
478 #ifdef CONFIG_NET_SCHED
479         {
480                 .procname       = "default_qdisc",
481                 .mode           = 0644,
482                 .maxlen         = IFNAMSIZ,
483                 .proc_handler   = set_default_qdisc
484         },
485 #endif
486 #endif /* CONFIG_NET */
487         {
488                 .procname       = "netdev_budget",
489                 .data           = &netdev_budget,
490                 .maxlen         = sizeof(int),
491                 .mode           = 0644,
492                 .proc_handler   = proc_dointvec
493         },
494         {
495                 .procname       = "warnings",
496                 .data           = &net_msg_warn,
497                 .maxlen         = sizeof(int),
498                 .mode           = 0644,
499                 .proc_handler   = proc_dointvec
500         },
501         {
502                 .procname       = "max_skb_frags",
503                 .data           = &sysctl_max_skb_frags,
504                 .maxlen         = sizeof(int),
505                 .mode           = 0644,
506                 .proc_handler   = proc_dointvec_minmax,
507                 .extra1         = &one,
508                 .extra2         = &max_skb_frags,
509         },
510         {
511                 .procname       = "netdev_budget_usecs",
512                 .data           = &netdev_budget_usecs,
513                 .maxlen         = sizeof(unsigned int),
514                 .mode           = 0644,
515                 .proc_handler   = proc_dointvec_minmax,
516                 .extra1         = &zero,
517         },
518         {
519                 .procname       = "fb_tunnels_only_for_init_net",
520                 .data           = &sysctl_fb_tunnels_only_for_init_net,
521                 .maxlen         = sizeof(int),
522                 .mode           = 0644,
523                 .proc_handler   = proc_dointvec_minmax,
524                 .extra1         = &zero,
525                 .extra2         = &one,
526         },
527         { }
528 };
529
530 static struct ctl_table netns_core_table[] = {
531         {
532                 .procname       = "somaxconn",
533                 .data           = &init_net.core.sysctl_somaxconn,
534                 .maxlen         = sizeof(int),
535                 .mode           = 0644,
536                 .extra1         = &zero,
537                 .proc_handler   = proc_dointvec_minmax
538         },
539         { }
540 };
541
542 static __net_init int sysctl_core_net_init(struct net *net)
543 {
544         struct ctl_table *tbl;
545
546         tbl = netns_core_table;
547         if (!net_eq(net, &init_net)) {
548                 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
549                 if (tbl == NULL)
550                         goto err_dup;
551
552                 tbl[0].data = &net->core.sysctl_somaxconn;
553
554                 /* Don't export any sysctls to unprivileged users */
555                 if (net->user_ns != &init_user_ns) {
556                         tbl[0].procname = NULL;
557                 }
558         }
559
560         net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
561         if (net->core.sysctl_hdr == NULL)
562                 goto err_reg;
563
564         return 0;
565
566 err_reg:
567         if (tbl != netns_core_table)
568                 kfree(tbl);
569 err_dup:
570         return -ENOMEM;
571 }
572
573 static __net_exit void sysctl_core_net_exit(struct net *net)
574 {
575         struct ctl_table *tbl;
576
577         tbl = net->core.sysctl_hdr->ctl_table_arg;
578         unregister_net_sysctl_table(net->core.sysctl_hdr);
579         BUG_ON(tbl == netns_core_table);
580         kfree(tbl);
581 }
582
583 static __net_initdata struct pernet_operations sysctl_core_ops = {
584         .init = sysctl_core_net_init,
585         .exit = sysctl_core_net_exit,
586 };
587
588 static __init int sysctl_core_init(void)
589 {
590         register_net_sysctl(&init_net, "net/core", net_core_table);
591         return register_pernet_subsys(&sysctl_core_ops);
592 }
593
594 fs_initcall(sysctl_core_init);