]> Git Repo - linux.git/blob - net/ipv4/sysctl_net_ipv4.c
drm/vc4: Run DRM default client setup
[linux.git] / net / ipv4 / sysctl_net_ipv4.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
4  *
5  * Begun April 1, 1996, Mike Shaver.
6  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
7  */
8
9 #include <linux/sysctl.h>
10 #include <linux/seqlock.h>
11 #include <linux/init.h>
12 #include <linux/slab.h>
13 #include <net/icmp.h>
14 #include <net/ip.h>
15 #include <net/ip_fib.h>
16 #include <net/tcp.h>
17 #include <net/udp.h>
18 #include <net/cipso_ipv4.h>
19 #include <net/ping.h>
20 #include <net/protocol.h>
21 #include <net/netevent.h>
22
23 static int tcp_retr1_max = 255;
24 static int ip_local_port_range_min[] = { 1, 1 };
25 static int ip_local_port_range_max[] = { 65535, 65535 };
26 static int tcp_adv_win_scale_min = -31;
27 static int tcp_adv_win_scale_max = 31;
28 static int tcp_app_win_max = 31;
29 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
30 static int tcp_min_snd_mss_max = 65535;
31 static int ip_privileged_port_min;
32 static int ip_privileged_port_max = 65535;
33 static int ip_ttl_min = 1;
34 static int ip_ttl_max = 255;
35 static int tcp_syn_retries_min = 1;
36 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
37 static int tcp_syn_linear_timeouts_max = MAX_TCP_SYNCNT;
38 static unsigned long ip_ping_group_range_min[] = { 0, 0 };
39 static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
40 static u32 u32_max_div_HZ = UINT_MAX / HZ;
41 static int one_day_secs = 24 * 3600;
42 static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
43         FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
44 static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024;
45 static unsigned int udp_child_hash_entries_max = UDP_HTABLE_SIZE_MAX;
46 static int tcp_plb_max_rounds = 31;
47 static int tcp_plb_max_cong_thresh = 256;
48
49 /* obsolete */
50 static int sysctl_tcp_low_latency __read_mostly;
51
52 /* Update system visible IP port range */
53 static void set_local_port_range(struct net *net, unsigned int low, unsigned int high)
54 {
55         bool same_parity = !((low ^ high) & 1);
56
57         if (same_parity && !net->ipv4.ip_local_ports.warned) {
58                 net->ipv4.ip_local_ports.warned = true;
59                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
60         }
61         WRITE_ONCE(net->ipv4.ip_local_ports.range, high << 16 | low);
62 }
63
64 /* Validate changes from /proc interface. */
65 static int ipv4_local_port_range(const struct ctl_table *table, int write,
66                                  void *buffer, size_t *lenp, loff_t *ppos)
67 {
68         struct net *net = table->data;
69         int ret;
70         int range[2];
71         struct ctl_table tmp = {
72                 .data = &range,
73                 .maxlen = sizeof(range),
74                 .mode = table->mode,
75                 .extra1 = &ip_local_port_range_min,
76                 .extra2 = &ip_local_port_range_max,
77         };
78
79         inet_get_local_port_range(net, &range[0], &range[1]);
80
81         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
82
83         if (write && ret == 0) {
84                 /* Ensure that the upper limit is not smaller than the lower,
85                  * and that the lower does not encroach upon the privileged
86                  * port limit.
87                  */
88                 if ((range[1] < range[0]) ||
89                     (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
90                         ret = -EINVAL;
91                 else
92                         set_local_port_range(net, range[0], range[1]);
93         }
94
95         return ret;
96 }
97
98 /* Validate changes from /proc interface. */
99 static int ipv4_privileged_ports(const struct ctl_table *table, int write,
100                                 void *buffer, size_t *lenp, loff_t *ppos)
101 {
102         struct net *net = container_of(table->data, struct net,
103             ipv4.sysctl_ip_prot_sock);
104         int ret;
105         int pports;
106         int range[2];
107         struct ctl_table tmp = {
108                 .data = &pports,
109                 .maxlen = sizeof(pports),
110                 .mode = table->mode,
111                 .extra1 = &ip_privileged_port_min,
112                 .extra2 = &ip_privileged_port_max,
113         };
114
115         pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
116
117         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
118
119         if (write && ret == 0) {
120                 inet_get_local_port_range(net, &range[0], &range[1]);
121                 /* Ensure that the local port range doesn't overlap with the
122                  * privileged port range.
123                  */
124                 if (range[0] < pports)
125                         ret = -EINVAL;
126                 else
127                         WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
128         }
129
130         return ret;
131 }
132
133 static void inet_get_ping_group_range_table(const struct ctl_table *table,
134                                             kgid_t *low, kgid_t *high)
135 {
136         kgid_t *data = table->data;
137         struct net *net =
138                 container_of(table->data, struct net, ipv4.ping_group_range.range);
139         unsigned int seq;
140         do {
141                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
142
143                 *low = data[0];
144                 *high = data[1];
145         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
146 }
147
148 /* Update system visible IP port range */
149 static void set_ping_group_range(const struct ctl_table *table,
150                                  kgid_t low, kgid_t high)
151 {
152         kgid_t *data = table->data;
153         struct net *net =
154                 container_of(table->data, struct net, ipv4.ping_group_range.range);
155         write_seqlock(&net->ipv4.ping_group_range.lock);
156         data[0] = low;
157         data[1] = high;
158         write_sequnlock(&net->ipv4.ping_group_range.lock);
159 }
160
161 /* Validate changes from /proc interface. */
162 static int ipv4_ping_group_range(const struct ctl_table *table, int write,
163                                  void *buffer, size_t *lenp, loff_t *ppos)
164 {
165         struct user_namespace *user_ns = current_user_ns();
166         int ret;
167         unsigned long urange[2];
168         kgid_t low, high;
169         struct ctl_table tmp = {
170                 .data = &urange,
171                 .maxlen = sizeof(urange),
172                 .mode = table->mode,
173                 .extra1 = &ip_ping_group_range_min,
174                 .extra2 = &ip_ping_group_range_max,
175         };
176
177         inet_get_ping_group_range_table(table, &low, &high);
178         urange[0] = from_kgid_munged(user_ns, low);
179         urange[1] = from_kgid_munged(user_ns, high);
180         ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
181
182         if (write && ret == 0) {
183                 low = make_kgid(user_ns, urange[0]);
184                 high = make_kgid(user_ns, urange[1]);
185                 if (!gid_valid(low) || !gid_valid(high))
186                         return -EINVAL;
187                 if (urange[1] < urange[0] || gid_lt(high, low)) {
188                         low = make_kgid(&init_user_ns, 1);
189                         high = make_kgid(&init_user_ns, 0);
190                 }
191                 set_ping_group_range(table, low, high);
192         }
193
194         return ret;
195 }
196
197 static int ipv4_fwd_update_priority(const struct ctl_table *table, int write,
198                                     void *buffer, size_t *lenp, loff_t *ppos)
199 {
200         struct net *net;
201         int ret;
202
203         net = container_of(table->data, struct net,
204                            ipv4.sysctl_ip_fwd_update_priority);
205         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
206         if (write && ret == 0)
207                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
208                                         net);
209
210         return ret;
211 }
212
213 static int proc_tcp_congestion_control(const struct ctl_table *ctl, int write,
214                                        void *buffer, size_t *lenp, loff_t *ppos)
215 {
216         struct net *net = container_of(ctl->data, struct net,
217                                        ipv4.tcp_congestion_control);
218         char val[TCP_CA_NAME_MAX];
219         struct ctl_table tbl = {
220                 .data = val,
221                 .maxlen = TCP_CA_NAME_MAX,
222         };
223         int ret;
224
225         tcp_get_default_congestion_control(net, val);
226
227         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
228         if (write && ret == 0)
229                 ret = tcp_set_default_congestion_control(net, val);
230         return ret;
231 }
232
233 static int proc_tcp_available_congestion_control(const struct ctl_table *ctl,
234                                                  int write, void *buffer,
235                                                  size_t *lenp, loff_t *ppos)
236 {
237         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
238         int ret;
239
240         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
241         if (!tbl.data)
242                 return -ENOMEM;
243         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
244         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
245         kfree(tbl.data);
246         return ret;
247 }
248
249 static int proc_allowed_congestion_control(const struct ctl_table *ctl,
250                                            int write, void *buffer,
251                                            size_t *lenp, loff_t *ppos)
252 {
253         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
254         int ret;
255
256         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
257         if (!tbl.data)
258                 return -ENOMEM;
259
260         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
261         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
262         if (write && ret == 0)
263                 ret = tcp_set_allowed_congestion_control(tbl.data);
264         kfree(tbl.data);
265         return ret;
266 }
267
268 static int sscanf_key(char *buf, __le32 *key)
269 {
270         u32 user_key[4];
271         int i, ret = 0;
272
273         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
274                    user_key + 2, user_key + 3) != 4) {
275                 ret = -EINVAL;
276         } else {
277                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
278                         key[i] = cpu_to_le32(user_key[i]);
279         }
280         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
281                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
282
283         return ret;
284 }
285
286 static int proc_tcp_fastopen_key(const struct ctl_table *table, int write,
287                                  void *buffer, size_t *lenp, loff_t *ppos)
288 {
289         struct net *net = container_of(table->data, struct net,
290             ipv4.sysctl_tcp_fastopen);
291         /* maxlen to print the list of keys in hex (*2), with dashes
292          * separating doublewords and a comma in between keys.
293          */
294         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
295                                             2 * TCP_FASTOPEN_KEY_MAX) +
296                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
297         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
298         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
299         char *backup_data;
300         int ret, i = 0, off = 0, n_keys;
301
302         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
303         if (!tbl.data)
304                 return -ENOMEM;
305
306         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
307         if (!n_keys) {
308                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
309                 n_keys = 1;
310         }
311
312         for (i = 0; i < n_keys * 4; i++)
313                 user_key[i] = le32_to_cpu(key[i]);
314
315         for (i = 0; i < n_keys; i++) {
316                 off += snprintf(tbl.data + off, tbl.maxlen - off,
317                                 "%08x-%08x-%08x-%08x",
318                                 user_key[i * 4],
319                                 user_key[i * 4 + 1],
320                                 user_key[i * 4 + 2],
321                                 user_key[i * 4 + 3]);
322
323                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
324                         break;
325
326                 if (i + 1 < n_keys)
327                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
328         }
329
330         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
331
332         if (write && ret == 0) {
333                 backup_data = strchr(tbl.data, ',');
334                 if (backup_data) {
335                         *backup_data = '\0';
336                         backup_data++;
337                 }
338                 if (sscanf_key(tbl.data, key)) {
339                         ret = -EINVAL;
340                         goto bad_key;
341                 }
342                 if (backup_data) {
343                         if (sscanf_key(backup_data, key + 4)) {
344                                 ret = -EINVAL;
345                                 goto bad_key;
346                         }
347                 }
348                 tcp_fastopen_reset_cipher(net, NULL, key,
349                                           backup_data ? key + 4 : NULL);
350         }
351
352 bad_key:
353         kfree(tbl.data);
354         return ret;
355 }
356
357 static int proc_tfo_blackhole_detect_timeout(const struct ctl_table *table,
358                                              int write, void *buffer,
359                                              size_t *lenp, loff_t *ppos)
360 {
361         struct net *net = container_of(table->data, struct net,
362             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
363         int ret;
364
365         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
366         if (write && ret == 0)
367                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
368
369         return ret;
370 }
371
372 static int proc_tcp_available_ulp(const struct ctl_table *ctl,
373                                   int write, void *buffer, size_t *lenp,
374                                   loff_t *ppos)
375 {
376         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
377         int ret;
378
379         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
380         if (!tbl.data)
381                 return -ENOMEM;
382         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
383         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
384         kfree(tbl.data);
385
386         return ret;
387 }
388
389 static int proc_tcp_ehash_entries(const struct ctl_table *table, int write,
390                                   void *buffer, size_t *lenp, loff_t *ppos)
391 {
392         struct net *net = container_of(table->data, struct net,
393                                        ipv4.sysctl_tcp_child_ehash_entries);
394         struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo;
395         int tcp_ehash_entries;
396         struct ctl_table tbl;
397
398         tcp_ehash_entries = hinfo->ehash_mask + 1;
399
400         /* A negative number indicates that the child netns
401          * shares the global ehash.
402          */
403         if (!net_eq(net, &init_net) && !hinfo->pernet)
404                 tcp_ehash_entries *= -1;
405
406         memset(&tbl, 0, sizeof(tbl));
407         tbl.data = &tcp_ehash_entries;
408         tbl.maxlen = sizeof(int);
409
410         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
411 }
412
413 static int proc_udp_hash_entries(const struct ctl_table *table, int write,
414                                  void *buffer, size_t *lenp, loff_t *ppos)
415 {
416         struct net *net = container_of(table->data, struct net,
417                                        ipv4.sysctl_udp_child_hash_entries);
418         int udp_hash_entries;
419         struct ctl_table tbl;
420
421         udp_hash_entries = net->ipv4.udp_table->mask + 1;
422
423         /* A negative number indicates that the child netns
424          * shares the global udp_table.
425          */
426         if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table)
427                 udp_hash_entries *= -1;
428
429         memset(&tbl, 0, sizeof(tbl));
430         tbl.data = &udp_hash_entries;
431         tbl.maxlen = sizeof(int);
432
433         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
434 }
435
436 #ifdef CONFIG_IP_ROUTE_MULTIPATH
437 static int proc_fib_multipath_hash_policy(const struct ctl_table *table, int write,
438                                           void *buffer, size_t *lenp,
439                                           loff_t *ppos)
440 {
441         struct net *net = container_of(table->data, struct net,
442             ipv4.sysctl_fib_multipath_hash_policy);
443         int ret;
444
445         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
446         if (write && ret == 0)
447                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
448
449         return ret;
450 }
451
452 static int proc_fib_multipath_hash_fields(const struct ctl_table *table, int write,
453                                           void *buffer, size_t *lenp,
454                                           loff_t *ppos)
455 {
456         struct net *net;
457         int ret;
458
459         net = container_of(table->data, struct net,
460                            ipv4.sysctl_fib_multipath_hash_fields);
461         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
462         if (write && ret == 0)
463                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
464
465         return ret;
466 }
467
468 static u32 proc_fib_multipath_hash_rand_seed __ro_after_init;
469
470 static void proc_fib_multipath_hash_init_rand_seed(void)
471 {
472         get_random_bytes(&proc_fib_multipath_hash_rand_seed,
473                          sizeof(proc_fib_multipath_hash_rand_seed));
474 }
475
476 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed)
477 {
478         struct sysctl_fib_multipath_hash_seed new = {
479                 .user_seed = user_seed,
480                 .mp_seed = (user_seed ? user_seed :
481                             proc_fib_multipath_hash_rand_seed),
482         };
483
484         WRITE_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed, new);
485 }
486
487 static int proc_fib_multipath_hash_seed(const struct ctl_table *table, int write,
488                                         void *buffer, size_t *lenp,
489                                         loff_t *ppos)
490 {
491         struct sysctl_fib_multipath_hash_seed *mphs;
492         struct net *net = table->data;
493         struct ctl_table tmp;
494         u32 user_seed;
495         int ret;
496
497         mphs = &net->ipv4.sysctl_fib_multipath_hash_seed;
498         user_seed = mphs->user_seed;
499
500         tmp = *table;
501         tmp.data = &user_seed;
502
503         ret = proc_douintvec_minmax(&tmp, write, buffer, lenp, ppos);
504
505         if (write && ret == 0) {
506                 proc_fib_multipath_hash_set_seed(net, user_seed);
507                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
508         }
509
510         return ret;
511 }
512 #else
513
514 static void proc_fib_multipath_hash_init_rand_seed(void)
515 {
516 }
517
518 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed)
519 {
520 }
521
522 #endif
523
524 static struct ctl_table ipv4_table[] = {
525         {
526                 .procname       = "tcp_max_orphans",
527                 .data           = &sysctl_tcp_max_orphans,
528                 .maxlen         = sizeof(int),
529                 .mode           = 0644,
530                 .proc_handler   = proc_dointvec
531         },
532         {
533                 .procname       = "inet_peer_threshold",
534                 .data           = &inet_peer_threshold,
535                 .maxlen         = sizeof(int),
536                 .mode           = 0644,
537                 .proc_handler   = proc_dointvec
538         },
539         {
540                 .procname       = "inet_peer_minttl",
541                 .data           = &inet_peer_minttl,
542                 .maxlen         = sizeof(int),
543                 .mode           = 0644,
544                 .proc_handler   = proc_dointvec_jiffies,
545         },
546         {
547                 .procname       = "inet_peer_maxttl",
548                 .data           = &inet_peer_maxttl,
549                 .maxlen         = sizeof(int),
550                 .mode           = 0644,
551                 .proc_handler   = proc_dointvec_jiffies,
552         },
553         {
554                 .procname       = "tcp_mem",
555                 .maxlen         = sizeof(sysctl_tcp_mem),
556                 .data           = &sysctl_tcp_mem,
557                 .mode           = 0644,
558                 .proc_handler   = proc_doulongvec_minmax,
559         },
560         {
561                 .procname       = "tcp_low_latency",
562                 .data           = &sysctl_tcp_low_latency,
563                 .maxlen         = sizeof(int),
564                 .mode           = 0644,
565                 .proc_handler   = proc_dointvec
566         },
567 #ifdef CONFIG_NETLABEL
568         {
569                 .procname       = "cipso_cache_enable",
570                 .data           = &cipso_v4_cache_enabled,
571                 .maxlen         = sizeof(int),
572                 .mode           = 0644,
573                 .proc_handler   = proc_dointvec,
574         },
575         {
576                 .procname       = "cipso_cache_bucket_size",
577                 .data           = &cipso_v4_cache_bucketsize,
578                 .maxlen         = sizeof(int),
579                 .mode           = 0644,
580                 .proc_handler   = proc_dointvec,
581         },
582         {
583                 .procname       = "cipso_rbm_optfmt",
584                 .data           = &cipso_v4_rbm_optfmt,
585                 .maxlen         = sizeof(int),
586                 .mode           = 0644,
587                 .proc_handler   = proc_dointvec,
588         },
589         {
590                 .procname       = "cipso_rbm_strictvalid",
591                 .data           = &cipso_v4_rbm_strictvalid,
592                 .maxlen         = sizeof(int),
593                 .mode           = 0644,
594                 .proc_handler   = proc_dointvec,
595         },
596 #endif /* CONFIG_NETLABEL */
597         {
598                 .procname       = "tcp_available_ulp",
599                 .maxlen         = TCP_ULP_BUF_MAX,
600                 .mode           = 0444,
601                 .proc_handler   = proc_tcp_available_ulp,
602         },
603         {
604                 .procname       = "icmp_msgs_per_sec",
605                 .data           = &sysctl_icmp_msgs_per_sec,
606                 .maxlen         = sizeof(int),
607                 .mode           = 0644,
608                 .proc_handler   = proc_dointvec_minmax,
609                 .extra1         = SYSCTL_ZERO,
610         },
611         {
612                 .procname       = "icmp_msgs_burst",
613                 .data           = &sysctl_icmp_msgs_burst,
614                 .maxlen         = sizeof(int),
615                 .mode           = 0644,
616                 .proc_handler   = proc_dointvec_minmax,
617                 .extra1         = SYSCTL_ZERO,
618         },
619         {
620                 .procname       = "udp_mem",
621                 .data           = &sysctl_udp_mem,
622                 .maxlen         = sizeof(sysctl_udp_mem),
623                 .mode           = 0644,
624                 .proc_handler   = proc_doulongvec_minmax,
625         },
626         {
627                 .procname       = "fib_sync_mem",
628                 .data           = &sysctl_fib_sync_mem,
629                 .maxlen         = sizeof(sysctl_fib_sync_mem),
630                 .mode           = 0644,
631                 .proc_handler   = proc_douintvec_minmax,
632                 .extra1         = &sysctl_fib_sync_mem_min,
633                 .extra2         = &sysctl_fib_sync_mem_max,
634         },
635 };
636
637 static struct ctl_table ipv4_net_table[] = {
638         {
639                 .procname       = "tcp_max_tw_buckets",
640                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
641                 .maxlen         = sizeof(int),
642                 .mode           = 0644,
643                 .proc_handler   = proc_dointvec
644         },
645         {
646                 .procname       = "icmp_echo_ignore_all",
647                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
648                 .maxlen         = sizeof(u8),
649                 .mode           = 0644,
650                 .proc_handler   = proc_dou8vec_minmax,
651                 .extra1         = SYSCTL_ZERO,
652                 .extra2         = SYSCTL_ONE
653         },
654         {
655                 .procname       = "icmp_echo_enable_probe",
656                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
657                 .maxlen         = sizeof(u8),
658                 .mode           = 0644,
659                 .proc_handler   = proc_dou8vec_minmax,
660                 .extra1         = SYSCTL_ZERO,
661                 .extra2         = SYSCTL_ONE
662         },
663         {
664                 .procname       = "icmp_echo_ignore_broadcasts",
665                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
666                 .maxlen         = sizeof(u8),
667                 .mode           = 0644,
668                 .proc_handler   = proc_dou8vec_minmax,
669                 .extra1         = SYSCTL_ZERO,
670                 .extra2         = SYSCTL_ONE
671         },
672         {
673                 .procname       = "icmp_ignore_bogus_error_responses",
674                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
675                 .maxlen         = sizeof(u8),
676                 .mode           = 0644,
677                 .proc_handler   = proc_dou8vec_minmax,
678                 .extra1         = SYSCTL_ZERO,
679                 .extra2         = SYSCTL_ONE
680         },
681         {
682                 .procname       = "icmp_errors_use_inbound_ifaddr",
683                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
684                 .maxlen         = sizeof(u8),
685                 .mode           = 0644,
686                 .proc_handler   = proc_dou8vec_minmax,
687                 .extra1         = SYSCTL_ZERO,
688                 .extra2         = SYSCTL_ONE
689         },
690         {
691                 .procname       = "icmp_ratelimit",
692                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
693                 .maxlen         = sizeof(int),
694                 .mode           = 0644,
695                 .proc_handler   = proc_dointvec_ms_jiffies,
696         },
697         {
698                 .procname       = "icmp_ratemask",
699                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
700                 .maxlen         = sizeof(int),
701                 .mode           = 0644,
702                 .proc_handler   = proc_dointvec
703         },
704         {
705                 .procname       = "ping_group_range",
706                 .data           = &init_net.ipv4.ping_group_range.range,
707                 .maxlen         = sizeof(gid_t)*2,
708                 .mode           = 0644,
709                 .proc_handler   = ipv4_ping_group_range,
710         },
711 #ifdef CONFIG_NET_L3_MASTER_DEV
712         {
713                 .procname       = "raw_l3mdev_accept",
714                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
715                 .maxlen         = sizeof(u8),
716                 .mode           = 0644,
717                 .proc_handler   = proc_dou8vec_minmax,
718                 .extra1         = SYSCTL_ZERO,
719                 .extra2         = SYSCTL_ONE,
720         },
721 #endif
722         {
723                 .procname       = "tcp_ecn",
724                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
725                 .maxlen         = sizeof(u8),
726                 .mode           = 0644,
727                 .proc_handler   = proc_dou8vec_minmax,
728                 .extra1         = SYSCTL_ZERO,
729                 .extra2         = SYSCTL_TWO,
730         },
731         {
732                 .procname       = "tcp_ecn_fallback",
733                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
734                 .maxlen         = sizeof(u8),
735                 .mode           = 0644,
736                 .proc_handler   = proc_dou8vec_minmax,
737                 .extra1         = SYSCTL_ZERO,
738                 .extra2         = SYSCTL_ONE,
739         },
740         {
741                 .procname       = "ip_dynaddr",
742                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
743                 .maxlen         = sizeof(u8),
744                 .mode           = 0644,
745                 .proc_handler   = proc_dou8vec_minmax,
746         },
747         {
748                 .procname       = "ip_early_demux",
749                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
750                 .maxlen         = sizeof(u8),
751                 .mode           = 0644,
752                 .proc_handler   = proc_dou8vec_minmax,
753         },
754         {
755                 .procname       = "udp_early_demux",
756                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
757                 .maxlen         = sizeof(u8),
758                 .mode           = 0644,
759                 .proc_handler   = proc_dou8vec_minmax,
760         },
761         {
762                 .procname       = "tcp_early_demux",
763                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
764                 .maxlen         = sizeof(u8),
765                 .mode           = 0644,
766                 .proc_handler   = proc_dou8vec_minmax,
767         },
768         {
769                 .procname       = "nexthop_compat_mode",
770                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
771                 .maxlen         = sizeof(u8),
772                 .mode           = 0644,
773                 .proc_handler   = proc_dou8vec_minmax,
774                 .extra1         = SYSCTL_ZERO,
775                 .extra2         = SYSCTL_ONE,
776         },
777         {
778                 .procname       = "ip_default_ttl",
779                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
780                 .maxlen         = sizeof(u8),
781                 .mode           = 0644,
782                 .proc_handler   = proc_dou8vec_minmax,
783                 .extra1         = &ip_ttl_min,
784                 .extra2         = &ip_ttl_max,
785         },
786         {
787                 .procname       = "ip_local_port_range",
788                 .maxlen         = 0,
789                 .data           = &init_net,
790                 .mode           = 0644,
791                 .proc_handler   = ipv4_local_port_range,
792         },
793         {
794                 .procname       = "ip_local_reserved_ports",
795                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
796                 .maxlen         = 65536,
797                 .mode           = 0644,
798                 .proc_handler   = proc_do_large_bitmap,
799         },
800         {
801                 .procname       = "ip_no_pmtu_disc",
802                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
803                 .maxlen         = sizeof(u8),
804                 .mode           = 0644,
805                 .proc_handler   = proc_dou8vec_minmax,
806         },
807         {
808                 .procname       = "ip_forward_use_pmtu",
809                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
810                 .maxlen         = sizeof(u8),
811                 .mode           = 0644,
812                 .proc_handler   = proc_dou8vec_minmax,
813         },
814         {
815                 .procname       = "ip_forward_update_priority",
816                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
817                 .maxlen         = sizeof(u8),
818                 .mode           = 0644,
819                 .proc_handler   = ipv4_fwd_update_priority,
820                 .extra1         = SYSCTL_ZERO,
821                 .extra2         = SYSCTL_ONE,
822         },
823         {
824                 .procname       = "ip_nonlocal_bind",
825                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
826                 .maxlen         = sizeof(u8),
827                 .mode           = 0644,
828                 .proc_handler   = proc_dou8vec_minmax,
829         },
830         {
831                 .procname       = "ip_autobind_reuse",
832                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
833                 .maxlen         = sizeof(u8),
834                 .mode           = 0644,
835                 .proc_handler   = proc_dou8vec_minmax,
836                 .extra1         = SYSCTL_ZERO,
837                 .extra2         = SYSCTL_ONE,
838         },
839         {
840                 .procname       = "fwmark_reflect",
841                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
842                 .maxlen         = sizeof(u8),
843                 .mode           = 0644,
844                 .proc_handler   = proc_dou8vec_minmax,
845         },
846         {
847                 .procname       = "tcp_fwmark_accept",
848                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
849                 .maxlen         = sizeof(u8),
850                 .mode           = 0644,
851                 .proc_handler   = proc_dou8vec_minmax,
852         },
853 #ifdef CONFIG_NET_L3_MASTER_DEV
854         {
855                 .procname       = "tcp_l3mdev_accept",
856                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
857                 .maxlen         = sizeof(u8),
858                 .mode           = 0644,
859                 .proc_handler   = proc_dou8vec_minmax,
860                 .extra1         = SYSCTL_ZERO,
861                 .extra2         = SYSCTL_ONE,
862         },
863 #endif
864         {
865                 .procname       = "tcp_mtu_probing",
866                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
867                 .maxlen         = sizeof(u8),
868                 .mode           = 0644,
869                 .proc_handler   = proc_dou8vec_minmax,
870         },
871         {
872                 .procname       = "tcp_base_mss",
873                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
874                 .maxlen         = sizeof(int),
875                 .mode           = 0644,
876                 .proc_handler   = proc_dointvec,
877         },
878         {
879                 .procname       = "tcp_min_snd_mss",
880                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
881                 .maxlen         = sizeof(int),
882                 .mode           = 0644,
883                 .proc_handler   = proc_dointvec_minmax,
884                 .extra1         = &tcp_min_snd_mss_min,
885                 .extra2         = &tcp_min_snd_mss_max,
886         },
887         {
888                 .procname       = "tcp_mtu_probe_floor",
889                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
890                 .maxlen         = sizeof(int),
891                 .mode           = 0644,
892                 .proc_handler   = proc_dointvec_minmax,
893                 .extra1         = &tcp_min_snd_mss_min,
894                 .extra2         = &tcp_min_snd_mss_max,
895         },
896         {
897                 .procname       = "tcp_probe_threshold",
898                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
899                 .maxlen         = sizeof(int),
900                 .mode           = 0644,
901                 .proc_handler   = proc_dointvec,
902         },
903         {
904                 .procname       = "tcp_probe_interval",
905                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
906                 .maxlen         = sizeof(u32),
907                 .mode           = 0644,
908                 .proc_handler   = proc_douintvec_minmax,
909                 .extra2         = &u32_max_div_HZ,
910         },
911         {
912                 .procname       = "igmp_link_local_mcast_reports",
913                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
914                 .maxlen         = sizeof(u8),
915                 .mode           = 0644,
916                 .proc_handler   = proc_dou8vec_minmax,
917         },
918         {
919                 .procname       = "igmp_max_memberships",
920                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
921                 .maxlen         = sizeof(int),
922                 .mode           = 0644,
923                 .proc_handler   = proc_dointvec
924         },
925         {
926                 .procname       = "igmp_max_msf",
927                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
928                 .maxlen         = sizeof(int),
929                 .mode           = 0644,
930                 .proc_handler   = proc_dointvec
931         },
932 #ifdef CONFIG_IP_MULTICAST
933         {
934                 .procname       = "igmp_qrv",
935                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
936                 .maxlen         = sizeof(int),
937                 .mode           = 0644,
938                 .proc_handler   = proc_dointvec_minmax,
939                 .extra1         = SYSCTL_ONE
940         },
941 #endif
942         {
943                 .procname       = "tcp_congestion_control",
944                 .data           = &init_net.ipv4.tcp_congestion_control,
945                 .mode           = 0644,
946                 .maxlen         = TCP_CA_NAME_MAX,
947                 .proc_handler   = proc_tcp_congestion_control,
948         },
949         {
950                 .procname       = "tcp_available_congestion_control",
951                 .maxlen         = TCP_CA_BUF_MAX,
952                 .mode           = 0444,
953                 .proc_handler   = proc_tcp_available_congestion_control,
954         },
955         {
956                 .procname       = "tcp_allowed_congestion_control",
957                 .maxlen         = TCP_CA_BUF_MAX,
958                 .mode           = 0644,
959                 .proc_handler   = proc_allowed_congestion_control,
960         },
961         {
962                 .procname       = "tcp_keepalive_time",
963                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
964                 .maxlen         = sizeof(int),
965                 .mode           = 0644,
966                 .proc_handler   = proc_dointvec_jiffies,
967         },
968         {
969                 .procname       = "tcp_keepalive_probes",
970                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
971                 .maxlen         = sizeof(u8),
972                 .mode           = 0644,
973                 .proc_handler   = proc_dou8vec_minmax,
974         },
975         {
976                 .procname       = "tcp_keepalive_intvl",
977                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
978                 .maxlen         = sizeof(int),
979                 .mode           = 0644,
980                 .proc_handler   = proc_dointvec_jiffies,
981         },
982         {
983                 .procname       = "tcp_syn_retries",
984                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
985                 .maxlen         = sizeof(u8),
986                 .mode           = 0644,
987                 .proc_handler   = proc_dou8vec_minmax,
988                 .extra1         = &tcp_syn_retries_min,
989                 .extra2         = &tcp_syn_retries_max
990         },
991         {
992                 .procname       = "tcp_synack_retries",
993                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
994                 .maxlen         = sizeof(u8),
995                 .mode           = 0644,
996                 .proc_handler   = proc_dou8vec_minmax,
997         },
998 #ifdef CONFIG_SYN_COOKIES
999         {
1000                 .procname       = "tcp_syncookies",
1001                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
1002                 .maxlen         = sizeof(u8),
1003                 .mode           = 0644,
1004                 .proc_handler   = proc_dou8vec_minmax,
1005         },
1006 #endif
1007         {
1008                 .procname       = "tcp_migrate_req",
1009                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
1010                 .maxlen         = sizeof(u8),
1011                 .mode           = 0644,
1012                 .proc_handler   = proc_dou8vec_minmax,
1013                 .extra1         = SYSCTL_ZERO,
1014                 .extra2         = SYSCTL_ONE
1015         },
1016         {
1017                 .procname       = "tcp_reordering",
1018                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
1019                 .maxlen         = sizeof(int),
1020                 .mode           = 0644,
1021                 .proc_handler   = proc_dointvec
1022         },
1023         {
1024                 .procname       = "tcp_retries1",
1025                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
1026                 .maxlen         = sizeof(u8),
1027                 .mode           = 0644,
1028                 .proc_handler   = proc_dou8vec_minmax,
1029                 .extra2         = &tcp_retr1_max
1030         },
1031         {
1032                 .procname       = "tcp_retries2",
1033                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
1034                 .maxlen         = sizeof(u8),
1035                 .mode           = 0644,
1036                 .proc_handler   = proc_dou8vec_minmax,
1037         },
1038         {
1039                 .procname       = "tcp_orphan_retries",
1040                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
1041                 .maxlen         = sizeof(u8),
1042                 .mode           = 0644,
1043                 .proc_handler   = proc_dou8vec_minmax,
1044         },
1045         {
1046                 .procname       = "tcp_fin_timeout",
1047                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
1048                 .maxlen         = sizeof(int),
1049                 .mode           = 0644,
1050                 .proc_handler   = proc_dointvec_jiffies,
1051         },
1052         {
1053                 .procname       = "tcp_notsent_lowat",
1054                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1055                 .maxlen         = sizeof(unsigned int),
1056                 .mode           = 0644,
1057                 .proc_handler   = proc_douintvec,
1058         },
1059         {
1060                 .procname       = "tcp_tw_reuse",
1061                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
1062                 .maxlen         = sizeof(u8),
1063                 .mode           = 0644,
1064                 .proc_handler   = proc_dou8vec_minmax,
1065                 .extra1         = SYSCTL_ZERO,
1066                 .extra2         = SYSCTL_TWO,
1067         },
1068         {
1069                 .procname       = "tcp_max_syn_backlog",
1070                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1071                 .maxlen         = sizeof(int),
1072                 .mode           = 0644,
1073                 .proc_handler   = proc_dointvec
1074         },
1075         {
1076                 .procname       = "tcp_fastopen",
1077                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1078                 .maxlen         = sizeof(int),
1079                 .mode           = 0644,
1080                 .proc_handler   = proc_dointvec,
1081         },
1082         {
1083                 .procname       = "tcp_fastopen_key",
1084                 .mode           = 0600,
1085                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1086                 /* maxlen to print the list of keys in hex (*2), with dashes
1087                  * separating doublewords and a comma in between keys.
1088                  */
1089                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1090                                    2 * TCP_FASTOPEN_KEY_MAX) +
1091                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1092                 .proc_handler   = proc_tcp_fastopen_key,
1093         },
1094         {
1095                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1096                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1097                 .maxlen         = sizeof(int),
1098                 .mode           = 0644,
1099                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1100                 .extra1         = SYSCTL_ZERO,
1101         },
1102 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1103         {
1104                 .procname       = "fib_multipath_use_neigh",
1105                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1106                 .maxlen         = sizeof(u8),
1107                 .mode           = 0644,
1108                 .proc_handler   = proc_dou8vec_minmax,
1109                 .extra1         = SYSCTL_ZERO,
1110                 .extra2         = SYSCTL_ONE,
1111         },
1112         {
1113                 .procname       = "fib_multipath_hash_policy",
1114                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1115                 .maxlen         = sizeof(u8),
1116                 .mode           = 0644,
1117                 .proc_handler   = proc_fib_multipath_hash_policy,
1118                 .extra1         = SYSCTL_ZERO,
1119                 .extra2         = SYSCTL_THREE,
1120         },
1121         {
1122                 .procname       = "fib_multipath_hash_fields",
1123                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1124                 .maxlen         = sizeof(u32),
1125                 .mode           = 0644,
1126                 .proc_handler   = proc_fib_multipath_hash_fields,
1127                 .extra1         = SYSCTL_ONE,
1128                 .extra2         = &fib_multipath_hash_fields_all_mask,
1129         },
1130         {
1131                 .procname       = "fib_multipath_hash_seed",
1132                 .data           = &init_net,
1133                 .maxlen         = sizeof(u32),
1134                 .mode           = 0644,
1135                 .proc_handler   = proc_fib_multipath_hash_seed,
1136         },
1137 #endif
1138         {
1139                 .procname       = "ip_unprivileged_port_start",
1140                 .maxlen         = sizeof(int),
1141                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1142                 .mode           = 0644,
1143                 .proc_handler   = ipv4_privileged_ports,
1144         },
1145 #ifdef CONFIG_NET_L3_MASTER_DEV
1146         {
1147                 .procname       = "udp_l3mdev_accept",
1148                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1149                 .maxlen         = sizeof(u8),
1150                 .mode           = 0644,
1151                 .proc_handler   = proc_dou8vec_minmax,
1152                 .extra1         = SYSCTL_ZERO,
1153                 .extra2         = SYSCTL_ONE,
1154         },
1155 #endif
1156         {
1157                 .procname       = "tcp_sack",
1158                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1159                 .maxlen         = sizeof(u8),
1160                 .mode           = 0644,
1161                 .proc_handler   = proc_dou8vec_minmax,
1162         },
1163         {
1164                 .procname       = "tcp_window_scaling",
1165                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1166                 .maxlen         = sizeof(u8),
1167                 .mode           = 0644,
1168                 .proc_handler   = proc_dou8vec_minmax,
1169         },
1170         {
1171                 .procname       = "tcp_timestamps",
1172                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1173                 .maxlen         = sizeof(u8),
1174                 .mode           = 0644,
1175                 .proc_handler   = proc_dou8vec_minmax,
1176         },
1177         {
1178                 .procname       = "tcp_early_retrans",
1179                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1180                 .maxlen         = sizeof(u8),
1181                 .mode           = 0644,
1182                 .proc_handler   = proc_dou8vec_minmax,
1183                 .extra1         = SYSCTL_ZERO,
1184                 .extra2         = SYSCTL_FOUR,
1185         },
1186         {
1187                 .procname       = "tcp_recovery",
1188                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1189                 .maxlen         = sizeof(u8),
1190                 .mode           = 0644,
1191                 .proc_handler   = proc_dou8vec_minmax,
1192         },
1193         {
1194                 .procname       = "tcp_thin_linear_timeouts",
1195                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1196                 .maxlen         = sizeof(u8),
1197                 .mode           = 0644,
1198                 .proc_handler   = proc_dou8vec_minmax,
1199         },
1200         {
1201                 .procname       = "tcp_slow_start_after_idle",
1202                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1203                 .maxlen         = sizeof(u8),
1204                 .mode           = 0644,
1205                 .proc_handler   = proc_dou8vec_minmax,
1206         },
1207         {
1208                 .procname       = "tcp_retrans_collapse",
1209                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1210                 .maxlen         = sizeof(u8),
1211                 .mode           = 0644,
1212                 .proc_handler   = proc_dou8vec_minmax,
1213         },
1214         {
1215                 .procname       = "tcp_stdurg",
1216                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1217                 .maxlen         = sizeof(u8),
1218                 .mode           = 0644,
1219                 .proc_handler   = proc_dou8vec_minmax,
1220         },
1221         {
1222                 .procname       = "tcp_rfc1337",
1223                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1224                 .maxlen         = sizeof(u8),
1225                 .mode           = 0644,
1226                 .proc_handler   = proc_dou8vec_minmax,
1227         },
1228         {
1229                 .procname       = "tcp_abort_on_overflow",
1230                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1231                 .maxlen         = sizeof(u8),
1232                 .mode           = 0644,
1233                 .proc_handler   = proc_dou8vec_minmax,
1234         },
1235         {
1236                 .procname       = "tcp_fack",
1237                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1238                 .maxlen         = sizeof(u8),
1239                 .mode           = 0644,
1240                 .proc_handler   = proc_dou8vec_minmax,
1241         },
1242         {
1243                 .procname       = "tcp_max_reordering",
1244                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1245                 .maxlen         = sizeof(int),
1246                 .mode           = 0644,
1247                 .proc_handler   = proc_dointvec
1248         },
1249         {
1250                 .procname       = "tcp_dsack",
1251                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1252                 .maxlen         = sizeof(u8),
1253                 .mode           = 0644,
1254                 .proc_handler   = proc_dou8vec_minmax,
1255         },
1256         {
1257                 .procname       = "tcp_app_win",
1258                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1259                 .maxlen         = sizeof(u8),
1260                 .mode           = 0644,
1261                 .proc_handler   = proc_dou8vec_minmax,
1262                 .extra1         = SYSCTL_ZERO,
1263                 .extra2         = &tcp_app_win_max,
1264         },
1265         {
1266                 .procname       = "tcp_adv_win_scale",
1267                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1268                 .maxlen         = sizeof(int),
1269                 .mode           = 0644,
1270                 .proc_handler   = proc_dointvec_minmax,
1271                 .extra1         = &tcp_adv_win_scale_min,
1272                 .extra2         = &tcp_adv_win_scale_max,
1273         },
1274         {
1275                 .procname       = "tcp_frto",
1276                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1277                 .maxlen         = sizeof(u8),
1278                 .mode           = 0644,
1279                 .proc_handler   = proc_dou8vec_minmax,
1280         },
1281         {
1282                 .procname       = "tcp_no_metrics_save",
1283                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1284                 .maxlen         = sizeof(u8),
1285                 .mode           = 0644,
1286                 .proc_handler   = proc_dou8vec_minmax,
1287         },
1288         {
1289                 .procname       = "tcp_no_ssthresh_metrics_save",
1290                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1291                 .maxlen         = sizeof(u8),
1292                 .mode           = 0644,
1293                 .proc_handler   = proc_dou8vec_minmax,
1294                 .extra1         = SYSCTL_ZERO,
1295                 .extra2         = SYSCTL_ONE,
1296         },
1297         {
1298                 .procname       = "tcp_moderate_rcvbuf",
1299                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1300                 .maxlen         = sizeof(u8),
1301                 .mode           = 0644,
1302                 .proc_handler   = proc_dou8vec_minmax,
1303         },
1304         {
1305                 .procname       = "tcp_tso_win_divisor",
1306                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1307                 .maxlen         = sizeof(u8),
1308                 .mode           = 0644,
1309                 .proc_handler   = proc_dou8vec_minmax,
1310         },
1311         {
1312                 .procname       = "tcp_workaround_signed_windows",
1313                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1314                 .maxlen         = sizeof(u8),
1315                 .mode           = 0644,
1316                 .proc_handler   = proc_dou8vec_minmax,
1317         },
1318         {
1319                 .procname       = "tcp_limit_output_bytes",
1320                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1321                 .maxlen         = sizeof(int),
1322                 .mode           = 0644,
1323                 .proc_handler   = proc_dointvec
1324         },
1325         {
1326                 .procname       = "tcp_challenge_ack_limit",
1327                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1328                 .maxlen         = sizeof(int),
1329                 .mode           = 0644,
1330                 .proc_handler   = proc_dointvec
1331         },
1332         {
1333                 .procname       = "tcp_min_tso_segs",
1334                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1335                 .maxlen         = sizeof(u8),
1336                 .mode           = 0644,
1337                 .proc_handler   = proc_dou8vec_minmax,
1338                 .extra1         = SYSCTL_ONE,
1339         },
1340         {
1341                 .procname       = "tcp_tso_rtt_log",
1342                 .data           = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1343                 .maxlen         = sizeof(u8),
1344                 .mode           = 0644,
1345                 .proc_handler   = proc_dou8vec_minmax,
1346         },
1347         {
1348                 .procname       = "tcp_min_rtt_wlen",
1349                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1350                 .maxlen         = sizeof(int),
1351                 .mode           = 0644,
1352                 .proc_handler   = proc_dointvec_minmax,
1353                 .extra1         = SYSCTL_ZERO,
1354                 .extra2         = &one_day_secs
1355         },
1356         {
1357                 .procname       = "tcp_autocorking",
1358                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1359                 .maxlen         = sizeof(u8),
1360                 .mode           = 0644,
1361                 .proc_handler   = proc_dou8vec_minmax,
1362                 .extra1         = SYSCTL_ZERO,
1363                 .extra2         = SYSCTL_ONE,
1364         },
1365         {
1366                 .procname       = "tcp_invalid_ratelimit",
1367                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1368                 .maxlen         = sizeof(int),
1369                 .mode           = 0644,
1370                 .proc_handler   = proc_dointvec_ms_jiffies,
1371         },
1372         {
1373                 .procname       = "tcp_pacing_ss_ratio",
1374                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1375                 .maxlen         = sizeof(int),
1376                 .mode           = 0644,
1377                 .proc_handler   = proc_dointvec_minmax,
1378                 .extra1         = SYSCTL_ZERO,
1379                 .extra2         = SYSCTL_ONE_THOUSAND,
1380         },
1381         {
1382                 .procname       = "tcp_pacing_ca_ratio",
1383                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1384                 .maxlen         = sizeof(int),
1385                 .mode           = 0644,
1386                 .proc_handler   = proc_dointvec_minmax,
1387                 .extra1         = SYSCTL_ZERO,
1388                 .extra2         = SYSCTL_ONE_THOUSAND,
1389         },
1390         {
1391                 .procname       = "tcp_wmem",
1392                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1393                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1394                 .mode           = 0644,
1395                 .proc_handler   = proc_dointvec_minmax,
1396                 .extra1         = SYSCTL_ONE,
1397         },
1398         {
1399                 .procname       = "tcp_rmem",
1400                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1401                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1402                 .mode           = 0644,
1403                 .proc_handler   = proc_dointvec_minmax,
1404                 .extra1         = SYSCTL_ONE,
1405         },
1406         {
1407                 .procname       = "tcp_comp_sack_delay_ns",
1408                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1409                 .maxlen         = sizeof(unsigned long),
1410                 .mode           = 0644,
1411                 .proc_handler   = proc_doulongvec_minmax,
1412         },
1413         {
1414                 .procname       = "tcp_comp_sack_slack_ns",
1415                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1416                 .maxlen         = sizeof(unsigned long),
1417                 .mode           = 0644,
1418                 .proc_handler   = proc_doulongvec_minmax,
1419         },
1420         {
1421                 .procname       = "tcp_comp_sack_nr",
1422                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1423                 .maxlen         = sizeof(u8),
1424                 .mode           = 0644,
1425                 .proc_handler   = proc_dou8vec_minmax,
1426                 .extra1         = SYSCTL_ZERO,
1427         },
1428         {
1429                 .procname       = "tcp_backlog_ack_defer",
1430                 .data           = &init_net.ipv4.sysctl_tcp_backlog_ack_defer,
1431                 .maxlen         = sizeof(u8),
1432                 .mode           = 0644,
1433                 .proc_handler   = proc_dou8vec_minmax,
1434                 .extra1         = SYSCTL_ZERO,
1435                 .extra2         = SYSCTL_ONE,
1436         },
1437         {
1438                 .procname       = "tcp_reflect_tos",
1439                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1440                 .maxlen         = sizeof(u8),
1441                 .mode           = 0644,
1442                 .proc_handler   = proc_dou8vec_minmax,
1443                 .extra1         = SYSCTL_ZERO,
1444                 .extra2         = SYSCTL_ONE,
1445         },
1446         {
1447                 .procname       = "tcp_ehash_entries",
1448                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1449                 .mode           = 0444,
1450                 .proc_handler   = proc_tcp_ehash_entries,
1451         },
1452         {
1453                 .procname       = "tcp_child_ehash_entries",
1454                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1455                 .maxlen         = sizeof(unsigned int),
1456                 .mode           = 0644,
1457                 .proc_handler   = proc_douintvec_minmax,
1458                 .extra1         = SYSCTL_ZERO,
1459                 .extra2         = &tcp_child_ehash_entries_max,
1460         },
1461         {
1462                 .procname       = "udp_hash_entries",
1463                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1464                 .mode           = 0444,
1465                 .proc_handler   = proc_udp_hash_entries,
1466         },
1467         {
1468                 .procname       = "udp_child_hash_entries",
1469                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1470                 .maxlen         = sizeof(unsigned int),
1471                 .mode           = 0644,
1472                 .proc_handler   = proc_douintvec_minmax,
1473                 .extra1         = SYSCTL_ZERO,
1474                 .extra2         = &udp_child_hash_entries_max,
1475         },
1476         {
1477                 .procname       = "udp_rmem_min",
1478                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1479                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1480                 .mode           = 0644,
1481                 .proc_handler   = proc_dointvec_minmax,
1482                 .extra1         = SYSCTL_ONE
1483         },
1484         {
1485                 .procname       = "udp_wmem_min",
1486                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1487                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1488                 .mode           = 0644,
1489                 .proc_handler   = proc_dointvec_minmax,
1490                 .extra1         = SYSCTL_ONE
1491         },
1492         {
1493                 .procname       = "fib_notify_on_flag_change",
1494                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1495                 .maxlen         = sizeof(u8),
1496                 .mode           = 0644,
1497                 .proc_handler   = proc_dou8vec_minmax,
1498                 .extra1         = SYSCTL_ZERO,
1499                 .extra2         = SYSCTL_TWO,
1500         },
1501         {
1502                 .procname       = "tcp_plb_enabled",
1503                 .data           = &init_net.ipv4.sysctl_tcp_plb_enabled,
1504                 .maxlen         = sizeof(u8),
1505                 .mode           = 0644,
1506                 .proc_handler   = proc_dou8vec_minmax,
1507                 .extra1         = SYSCTL_ZERO,
1508                 .extra2         = SYSCTL_ONE,
1509         },
1510         {
1511                 .procname       = "tcp_plb_idle_rehash_rounds",
1512                 .data           = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds,
1513                 .maxlen         = sizeof(u8),
1514                 .mode           = 0644,
1515                 .proc_handler   = proc_dou8vec_minmax,
1516                 .extra2         = &tcp_plb_max_rounds,
1517         },
1518         {
1519                 .procname       = "tcp_plb_rehash_rounds",
1520                 .data           = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds,
1521                 .maxlen         = sizeof(u8),
1522                 .mode           = 0644,
1523                 .proc_handler   = proc_dou8vec_minmax,
1524                 .extra2         = &tcp_plb_max_rounds,
1525         },
1526         {
1527                 .procname       = "tcp_plb_suspend_rto_sec",
1528                 .data           = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec,
1529                 .maxlen         = sizeof(u8),
1530                 .mode           = 0644,
1531                 .proc_handler   = proc_dou8vec_minmax,
1532         },
1533         {
1534                 .procname       = "tcp_plb_cong_thresh",
1535                 .data           = &init_net.ipv4.sysctl_tcp_plb_cong_thresh,
1536                 .maxlen         = sizeof(int),
1537                 .mode           = 0644,
1538                 .proc_handler   = proc_dointvec_minmax,
1539                 .extra1         = SYSCTL_ZERO,
1540                 .extra2         = &tcp_plb_max_cong_thresh,
1541         },
1542         {
1543                 .procname       = "tcp_syn_linear_timeouts",
1544                 .data           = &init_net.ipv4.sysctl_tcp_syn_linear_timeouts,
1545                 .maxlen         = sizeof(u8),
1546                 .mode           = 0644,
1547                 .proc_handler   = proc_dou8vec_minmax,
1548                 .extra1         = SYSCTL_ZERO,
1549                 .extra2         = &tcp_syn_linear_timeouts_max,
1550         },
1551         {
1552                 .procname       = "tcp_shrink_window",
1553                 .data           = &init_net.ipv4.sysctl_tcp_shrink_window,
1554                 .maxlen         = sizeof(u8),
1555                 .mode           = 0644,
1556                 .proc_handler   = proc_dou8vec_minmax,
1557                 .extra1         = SYSCTL_ZERO,
1558                 .extra2         = SYSCTL_ONE,
1559         },
1560         {
1561                 .procname       = "tcp_pingpong_thresh",
1562                 .data           = &init_net.ipv4.sysctl_tcp_pingpong_thresh,
1563                 .maxlen         = sizeof(u8),
1564                 .mode           = 0644,
1565                 .proc_handler   = proc_dou8vec_minmax,
1566                 .extra1         = SYSCTL_ONE,
1567         },
1568         {
1569                 .procname       = "tcp_rto_min_us",
1570                 .data           = &init_net.ipv4.sysctl_tcp_rto_min_us,
1571                 .maxlen         = sizeof(int),
1572                 .mode           = 0644,
1573                 .proc_handler   = proc_dointvec_minmax,
1574                 .extra1         = SYSCTL_ONE,
1575         },
1576 };
1577
1578 static __net_init int ipv4_sysctl_init_net(struct net *net)
1579 {
1580         size_t table_size = ARRAY_SIZE(ipv4_net_table);
1581         struct ctl_table *table;
1582
1583         table = ipv4_net_table;
1584         if (!net_eq(net, &init_net)) {
1585                 int i;
1586
1587                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1588                 if (!table)
1589                         goto err_alloc;
1590
1591                 for (i = 0; i < table_size; i++) {
1592                         if (table[i].data) {
1593                                 /* Update the variables to point into
1594                                  * the current struct net
1595                                  */
1596                                 table[i].data += (void *)net - (void *)&init_net;
1597                         } else {
1598                                 /* Entries without data pointer are global;
1599                                  * Make them read-only in non-init_net ns
1600                                  */
1601                                 table[i].mode &= ~0222;
1602                         }
1603                 }
1604         }
1605
1606         net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table,
1607                                                     table_size);
1608         if (!net->ipv4.ipv4_hdr)
1609                 goto err_reg;
1610
1611         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1612         if (!net->ipv4.sysctl_local_reserved_ports)
1613                 goto err_ports;
1614
1615         proc_fib_multipath_hash_set_seed(net, 0);
1616
1617         return 0;
1618
1619 err_ports:
1620         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1621 err_reg:
1622         if (!net_eq(net, &init_net))
1623                 kfree(table);
1624 err_alloc:
1625         return -ENOMEM;
1626 }
1627
1628 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1629 {
1630         const struct ctl_table *table;
1631
1632         kfree(net->ipv4.sysctl_local_reserved_ports);
1633         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1634         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1635         kfree(table);
1636 }
1637
1638 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1639         .init = ipv4_sysctl_init_net,
1640         .exit = ipv4_sysctl_exit_net,
1641 };
1642
1643 static __init int sysctl_ipv4_init(void)
1644 {
1645         struct ctl_table_header *hdr;
1646
1647         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1648         if (!hdr)
1649                 return -ENOMEM;
1650
1651         proc_fib_multipath_hash_init_rand_seed();
1652
1653         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1654                 unregister_net_sysctl_table(hdr);
1655                 return -ENOMEM;
1656         }
1657
1658         return 0;
1659 }
1660
1661 __initcall(sysctl_ipv4_init);
This page took 0.129244 seconds and 4 git commands to generate.