Merge drm/drm-next into drm-intel-next-queued
[linux-2.6-microblaze.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/mm.h>
10 #include <linux/module.h>
11 #include <linux/sysctl.h>
12 #include <linux/igmp.h>
13 #include <linux/inetdevice.h>
14 #include <linux/seqlock.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/nsproxy.h>
18 #include <linux/swap.h>
19 #include <net/snmp.h>
20 #include <net/icmp.h>
21 #include <net/ip.h>
22 #include <net/route.h>
23 #include <net/tcp.h>
24 #include <net/udp.h>
25 #include <net/cipso_ipv4.h>
26 #include <net/inet_frag.h>
27 #include <net/ping.h>
28 #include <net/protocol.h>
29 #include <net/netevent.h>
30
31 static int two = 2;
32 static int four = 4;
33 static int thousand = 1000;
34 static int gso_max_segs = GSO_MAX_SEGS;
35 static int tcp_retr1_max = 255;
36 static int ip_local_port_range_min[] = { 1, 1 };
37 static int ip_local_port_range_max[] = { 65535, 65535 };
38 static int tcp_adv_win_scale_min = -31;
39 static int tcp_adv_win_scale_max = 31;
40 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
41 static int tcp_min_snd_mss_max = 65535;
42 static int ip_privileged_port_min;
43 static int ip_privileged_port_max = 65535;
44 static int ip_ttl_min = 1;
45 static int ip_ttl_max = 255;
46 static int tcp_syn_retries_min = 1;
47 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
48 static int ip_ping_group_range_min[] = { 0, 0 };
49 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
50 static int comp_sack_nr_max = 255;
51 static u32 u32_max_div_HZ = UINT_MAX / HZ;
52 static int one_day_secs = 24 * 3600;
53
54 /* obsolete */
55 static int sysctl_tcp_low_latency __read_mostly;
56
57 /* Update system visible IP port range */
58 static void set_local_port_range(struct net *net, int range[2])
59 {
60         bool same_parity = !((range[0] ^ range[1]) & 1);
61
62         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
63         if (same_parity && !net->ipv4.ip_local_ports.warned) {
64                 net->ipv4.ip_local_ports.warned = true;
65                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
66         }
67         net->ipv4.ip_local_ports.range[0] = range[0];
68         net->ipv4.ip_local_ports.range[1] = range[1];
69         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
70 }
71
72 /* Validate changes from /proc interface. */
73 static int ipv4_local_port_range(struct ctl_table *table, int write,
74                                  void *buffer, size_t *lenp, loff_t *ppos)
75 {
76         struct net *net =
77                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
78         int ret;
79         int range[2];
80         struct ctl_table tmp = {
81                 .data = &range,
82                 .maxlen = sizeof(range),
83                 .mode = table->mode,
84                 .extra1 = &ip_local_port_range_min,
85                 .extra2 = &ip_local_port_range_max,
86         };
87
88         inet_get_local_port_range(net, &range[0], &range[1]);
89
90         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
91
92         if (write && ret == 0) {
93                 /* Ensure that the upper limit is not smaller than the lower,
94                  * and that the lower does not encroach upon the privileged
95                  * port limit.
96                  */
97                 if ((range[1] < range[0]) ||
98                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
99                         ret = -EINVAL;
100                 else
101                         set_local_port_range(net, range);
102         }
103
104         return ret;
105 }
106
107 /* Validate changes from /proc interface. */
108 static int ipv4_privileged_ports(struct ctl_table *table, int write,
109                                 void *buffer, size_t *lenp, loff_t *ppos)
110 {
111         struct net *net = container_of(table->data, struct net,
112             ipv4.sysctl_ip_prot_sock);
113         int ret;
114         int pports;
115         int range[2];
116         struct ctl_table tmp = {
117                 .data = &pports,
118                 .maxlen = sizeof(pports),
119                 .mode = table->mode,
120                 .extra1 = &ip_privileged_port_min,
121                 .extra2 = &ip_privileged_port_max,
122         };
123
124         pports = net->ipv4.sysctl_ip_prot_sock;
125
126         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
127
128         if (write && ret == 0) {
129                 inet_get_local_port_range(net, &range[0], &range[1]);
130                 /* Ensure that the local port range doesn't overlap with the
131                  * privileged port range.
132                  */
133                 if (range[0] < pports)
134                         ret = -EINVAL;
135                 else
136                         net->ipv4.sysctl_ip_prot_sock = pports;
137         }
138
139         return ret;
140 }
141
142 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
143 {
144         kgid_t *data = table->data;
145         struct net *net =
146                 container_of(table->data, struct net, ipv4.ping_group_range.range);
147         unsigned int seq;
148         do {
149                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
150
151                 *low = data[0];
152                 *high = data[1];
153         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
154 }
155
156 /* Update system visible IP port range */
157 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
158 {
159         kgid_t *data = table->data;
160         struct net *net =
161                 container_of(table->data, struct net, ipv4.ping_group_range.range);
162         write_seqlock(&net->ipv4.ping_group_range.lock);
163         data[0] = low;
164         data[1] = high;
165         write_sequnlock(&net->ipv4.ping_group_range.lock);
166 }
167
168 /* Validate changes from /proc interface. */
169 static int ipv4_ping_group_range(struct ctl_table *table, int write,
170                                  void *buffer, size_t *lenp, loff_t *ppos)
171 {
172         struct user_namespace *user_ns = current_user_ns();
173         int ret;
174         gid_t urange[2];
175         kgid_t low, high;
176         struct ctl_table tmp = {
177                 .data = &urange,
178                 .maxlen = sizeof(urange),
179                 .mode = table->mode,
180                 .extra1 = &ip_ping_group_range_min,
181                 .extra2 = &ip_ping_group_range_max,
182         };
183
184         inet_get_ping_group_range_table(table, &low, &high);
185         urange[0] = from_kgid_munged(user_ns, low);
186         urange[1] = from_kgid_munged(user_ns, high);
187         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
188
189         if (write && ret == 0) {
190                 low = make_kgid(user_ns, urange[0]);
191                 high = make_kgid(user_ns, urange[1]);
192                 if (!gid_valid(low) || !gid_valid(high))
193                         return -EINVAL;
194                 if (urange[1] < urange[0] || gid_lt(high, low)) {
195                         low = make_kgid(&init_user_ns, 1);
196                         high = make_kgid(&init_user_ns, 0);
197                 }
198                 set_ping_group_range(table, low, high);
199         }
200
201         return ret;
202 }
203
204 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
205                                     void *buffer, size_t *lenp, loff_t *ppos)
206 {
207         struct net *net;
208         int ret;
209
210         net = container_of(table->data, struct net,
211                            ipv4.sysctl_ip_fwd_update_priority);
212         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
213         if (write && ret == 0)
214                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
215                                         net);
216
217         return ret;
218 }
219
220 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
221                                        void *buffer, size_t *lenp, loff_t *ppos)
222 {
223         struct net *net = container_of(ctl->data, struct net,
224                                        ipv4.tcp_congestion_control);
225         char val[TCP_CA_NAME_MAX];
226         struct ctl_table tbl = {
227                 .data = val,
228                 .maxlen = TCP_CA_NAME_MAX,
229         };
230         int ret;
231
232         tcp_get_default_congestion_control(net, val);
233
234         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
235         if (write && ret == 0)
236                 ret = tcp_set_default_congestion_control(net, val);
237         return ret;
238 }
239
240 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
241                                                  int write, void *buffer,
242                                                  size_t *lenp, loff_t *ppos)
243 {
244         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
245         int ret;
246
247         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
248         if (!tbl.data)
249                 return -ENOMEM;
250         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
251         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
252         kfree(tbl.data);
253         return ret;
254 }
255
256 static int proc_allowed_congestion_control(struct ctl_table *ctl,
257                                            int write, void *buffer,
258                                            size_t *lenp, loff_t *ppos)
259 {
260         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
261         int ret;
262
263         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
264         if (!tbl.data)
265                 return -ENOMEM;
266
267         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
268         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
269         if (write && ret == 0)
270                 ret = tcp_set_allowed_congestion_control(tbl.data);
271         kfree(tbl.data);
272         return ret;
273 }
274
275 static int sscanf_key(char *buf, __le32 *key)
276 {
277         u32 user_key[4];
278         int i, ret = 0;
279
280         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
281                    user_key + 2, user_key + 3) != 4) {
282                 ret = -EINVAL;
283         } else {
284                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
285                         key[i] = cpu_to_le32(user_key[i]);
286         }
287         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
288                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
289
290         return ret;
291 }
292
293 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
294                                  void *buffer, size_t *lenp, loff_t *ppos)
295 {
296         struct net *net = container_of(table->data, struct net,
297             ipv4.sysctl_tcp_fastopen);
298         /* maxlen to print the list of keys in hex (*2), with dashes
299          * separating doublewords and a comma in between keys.
300          */
301         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
302                                             2 * TCP_FASTOPEN_KEY_MAX) +
303                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
304         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
305         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
306         char *backup_data;
307         int ret, i = 0, off = 0, n_keys;
308
309         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
310         if (!tbl.data)
311                 return -ENOMEM;
312
313         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
314         if (!n_keys) {
315                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
316                 n_keys = 1;
317         }
318
319         for (i = 0; i < n_keys * 4; i++)
320                 user_key[i] = le32_to_cpu(key[i]);
321
322         for (i = 0; i < n_keys; i++) {
323                 off += snprintf(tbl.data + off, tbl.maxlen - off,
324                                 "%08x-%08x-%08x-%08x",
325                                 user_key[i * 4],
326                                 user_key[i * 4 + 1],
327                                 user_key[i * 4 + 2],
328                                 user_key[i * 4 + 3]);
329
330                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
331                         break;
332
333                 if (i + 1 < n_keys)
334                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
335         }
336
337         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
338
339         if (write && ret == 0) {
340                 backup_data = strchr(tbl.data, ',');
341                 if (backup_data) {
342                         *backup_data = '\0';
343                         backup_data++;
344                 }
345                 if (sscanf_key(tbl.data, key)) {
346                         ret = -EINVAL;
347                         goto bad_key;
348                 }
349                 if (backup_data) {
350                         if (sscanf_key(backup_data, key + 4)) {
351                                 ret = -EINVAL;
352                                 goto bad_key;
353                         }
354                 }
355                 tcp_fastopen_reset_cipher(net, NULL, key,
356                                           backup_data ? key + 4 : NULL);
357         }
358
359 bad_key:
360         kfree(tbl.data);
361         return ret;
362 }
363
364 static void proc_configure_early_demux(int enabled, int protocol)
365 {
366         struct net_protocol *ipprot;
367 #if IS_ENABLED(CONFIG_IPV6)
368         struct inet6_protocol *ip6prot;
369 #endif
370
371         rcu_read_lock();
372
373         ipprot = rcu_dereference(inet_protos[protocol]);
374         if (ipprot)
375                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
376                                                 NULL;
377
378 #if IS_ENABLED(CONFIG_IPV6)
379         ip6prot = rcu_dereference(inet6_protos[protocol]);
380         if (ip6prot)
381                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
382                                                  NULL;
383 #endif
384         rcu_read_unlock();
385 }
386
387 static int proc_tcp_early_demux(struct ctl_table *table, int write,
388                                 void *buffer, size_t *lenp, loff_t *ppos)
389 {
390         int ret = 0;
391
392         ret = proc_dointvec(table, write, buffer, lenp, ppos);
393
394         if (write && !ret) {
395                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
396
397                 proc_configure_early_demux(enabled, IPPROTO_TCP);
398         }
399
400         return ret;
401 }
402
403 static int proc_udp_early_demux(struct ctl_table *table, int write,
404                                 void *buffer, size_t *lenp, loff_t *ppos)
405 {
406         int ret = 0;
407
408         ret = proc_dointvec(table, write, buffer, lenp, ppos);
409
410         if (write && !ret) {
411                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
412
413                 proc_configure_early_demux(enabled, IPPROTO_UDP);
414         }
415
416         return ret;
417 }
418
419 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
420                                              int write, void *buffer,
421                                              size_t *lenp, loff_t *ppos)
422 {
423         struct net *net = container_of(table->data, struct net,
424             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
425         int ret;
426
427         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
428         if (write && ret == 0)
429                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
430
431         return ret;
432 }
433
434 static int proc_tcp_available_ulp(struct ctl_table *ctl,
435                                   int write, void *buffer, size_t *lenp,
436                                   loff_t *ppos)
437 {
438         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
439         int ret;
440
441         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
442         if (!tbl.data)
443                 return -ENOMEM;
444         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
445         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
446         kfree(tbl.data);
447
448         return ret;
449 }
450
451 #ifdef CONFIG_IP_ROUTE_MULTIPATH
452 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
453                                           void *buffer, size_t *lenp,
454                                           loff_t *ppos)
455 {
456         struct net *net = container_of(table->data, struct net,
457             ipv4.sysctl_fib_multipath_hash_policy);
458         int ret;
459
460         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
461         if (write && ret == 0)
462                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
463
464         return ret;
465 }
466 #endif
467
468 static struct ctl_table ipv4_table[] = {
469         {
470                 .procname       = "tcp_max_orphans",
471                 .data           = &sysctl_tcp_max_orphans,
472                 .maxlen         = sizeof(int),
473                 .mode           = 0644,
474                 .proc_handler   = proc_dointvec
475         },
476         {
477                 .procname       = "inet_peer_threshold",
478                 .data           = &inet_peer_threshold,
479                 .maxlen         = sizeof(int),
480                 .mode           = 0644,
481                 .proc_handler   = proc_dointvec
482         },
483         {
484                 .procname       = "inet_peer_minttl",
485                 .data           = &inet_peer_minttl,
486                 .maxlen         = sizeof(int),
487                 .mode           = 0644,
488                 .proc_handler   = proc_dointvec_jiffies,
489         },
490         {
491                 .procname       = "inet_peer_maxttl",
492                 .data           = &inet_peer_maxttl,
493                 .maxlen         = sizeof(int),
494                 .mode           = 0644,
495                 .proc_handler   = proc_dointvec_jiffies,
496         },
497         {
498                 .procname       = "tcp_mem",
499                 .maxlen         = sizeof(sysctl_tcp_mem),
500                 .data           = &sysctl_tcp_mem,
501                 .mode           = 0644,
502                 .proc_handler   = proc_doulongvec_minmax,
503         },
504         {
505                 .procname       = "tcp_low_latency",
506                 .data           = &sysctl_tcp_low_latency,
507                 .maxlen         = sizeof(int),
508                 .mode           = 0644,
509                 .proc_handler   = proc_dointvec
510         },
511 #ifdef CONFIG_NETLABEL
512         {
513                 .procname       = "cipso_cache_enable",
514                 .data           = &cipso_v4_cache_enabled,
515                 .maxlen         = sizeof(int),
516                 .mode           = 0644,
517                 .proc_handler   = proc_dointvec,
518         },
519         {
520                 .procname       = "cipso_cache_bucket_size",
521                 .data           = &cipso_v4_cache_bucketsize,
522                 .maxlen         = sizeof(int),
523                 .mode           = 0644,
524                 .proc_handler   = proc_dointvec,
525         },
526         {
527                 .procname       = "cipso_rbm_optfmt",
528                 .data           = &cipso_v4_rbm_optfmt,
529                 .maxlen         = sizeof(int),
530                 .mode           = 0644,
531                 .proc_handler   = proc_dointvec,
532         },
533         {
534                 .procname       = "cipso_rbm_strictvalid",
535                 .data           = &cipso_v4_rbm_strictvalid,
536                 .maxlen         = sizeof(int),
537                 .mode           = 0644,
538                 .proc_handler   = proc_dointvec,
539         },
540 #endif /* CONFIG_NETLABEL */
541         {
542                 .procname       = "tcp_available_ulp",
543                 .maxlen         = TCP_ULP_BUF_MAX,
544                 .mode           = 0444,
545                 .proc_handler   = proc_tcp_available_ulp,
546         },
547         {
548                 .procname       = "icmp_msgs_per_sec",
549                 .data           = &sysctl_icmp_msgs_per_sec,
550                 .maxlen         = sizeof(int),
551                 .mode           = 0644,
552                 .proc_handler   = proc_dointvec_minmax,
553                 .extra1         = SYSCTL_ZERO,
554         },
555         {
556                 .procname       = "icmp_msgs_burst",
557                 .data           = &sysctl_icmp_msgs_burst,
558                 .maxlen         = sizeof(int),
559                 .mode           = 0644,
560                 .proc_handler   = proc_dointvec_minmax,
561                 .extra1         = SYSCTL_ZERO,
562         },
563         {
564                 .procname       = "udp_mem",
565                 .data           = &sysctl_udp_mem,
566                 .maxlen         = sizeof(sysctl_udp_mem),
567                 .mode           = 0644,
568                 .proc_handler   = proc_doulongvec_minmax,
569         },
570         {
571                 .procname       = "fib_sync_mem",
572                 .data           = &sysctl_fib_sync_mem,
573                 .maxlen         = sizeof(sysctl_fib_sync_mem),
574                 .mode           = 0644,
575                 .proc_handler   = proc_douintvec_minmax,
576                 .extra1         = &sysctl_fib_sync_mem_min,
577                 .extra2         = &sysctl_fib_sync_mem_max,
578         },
579         {
580                 .procname       = "tcp_rx_skb_cache",
581                 .data           = &tcp_rx_skb_cache_key.key,
582                 .mode           = 0644,
583                 .proc_handler   = proc_do_static_key,
584         },
585         {
586                 .procname       = "tcp_tx_skb_cache",
587                 .data           = &tcp_tx_skb_cache_key.key,
588                 .mode           = 0644,
589                 .proc_handler   = proc_do_static_key,
590         },
591         { }
592 };
593
594 static struct ctl_table ipv4_net_table[] = {
595         {
596                 .procname       = "icmp_echo_ignore_all",
597                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
598                 .maxlen         = sizeof(int),
599                 .mode           = 0644,
600                 .proc_handler   = proc_dointvec
601         },
602         {
603                 .procname       = "icmp_echo_ignore_broadcasts",
604                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
605                 .maxlen         = sizeof(int),
606                 .mode           = 0644,
607                 .proc_handler   = proc_dointvec
608         },
609         {
610                 .procname       = "icmp_ignore_bogus_error_responses",
611                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
612                 .maxlen         = sizeof(int),
613                 .mode           = 0644,
614                 .proc_handler   = proc_dointvec
615         },
616         {
617                 .procname       = "icmp_errors_use_inbound_ifaddr",
618                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
619                 .maxlen         = sizeof(int),
620                 .mode           = 0644,
621                 .proc_handler   = proc_dointvec
622         },
623         {
624                 .procname       = "icmp_ratelimit",
625                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
626                 .maxlen         = sizeof(int),
627                 .mode           = 0644,
628                 .proc_handler   = proc_dointvec_ms_jiffies,
629         },
630         {
631                 .procname       = "icmp_ratemask",
632                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
633                 .maxlen         = sizeof(int),
634                 .mode           = 0644,
635                 .proc_handler   = proc_dointvec
636         },
637         {
638                 .procname       = "ping_group_range",
639                 .data           = &init_net.ipv4.ping_group_range.range,
640                 .maxlen         = sizeof(gid_t)*2,
641                 .mode           = 0644,
642                 .proc_handler   = ipv4_ping_group_range,
643         },
644 #ifdef CONFIG_NET_L3_MASTER_DEV
645         {
646                 .procname       = "raw_l3mdev_accept",
647                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
648                 .maxlen         = sizeof(int),
649                 .mode           = 0644,
650                 .proc_handler   = proc_dointvec_minmax,
651                 .extra1         = SYSCTL_ZERO,
652                 .extra2         = SYSCTL_ONE,
653         },
654 #endif
655         {
656                 .procname       = "tcp_ecn",
657                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
658                 .maxlen         = sizeof(int),
659                 .mode           = 0644,
660                 .proc_handler   = proc_dointvec
661         },
662         {
663                 .procname       = "tcp_ecn_fallback",
664                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
665                 .maxlen         = sizeof(int),
666                 .mode           = 0644,
667                 .proc_handler   = proc_dointvec
668         },
669         {
670                 .procname       = "ip_dynaddr",
671                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
672                 .maxlen         = sizeof(int),
673                 .mode           = 0644,
674                 .proc_handler   = proc_dointvec
675         },
676         {
677                 .procname       = "ip_early_demux",
678                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
679                 .maxlen         = sizeof(int),
680                 .mode           = 0644,
681                 .proc_handler   = proc_dointvec
682         },
683         {
684                 .procname       = "udp_early_demux",
685                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
686                 .maxlen         = sizeof(int),
687                 .mode           = 0644,
688                 .proc_handler   = proc_udp_early_demux
689         },
690         {
691                 .procname       = "tcp_early_demux",
692                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
693                 .maxlen         = sizeof(int),
694                 .mode           = 0644,
695                 .proc_handler   = proc_tcp_early_demux
696         },
697         {
698                 .procname       = "nexthop_compat_mode",
699                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
700                 .maxlen         = sizeof(int),
701                 .mode           = 0644,
702                 .proc_handler   = proc_dointvec_minmax,
703                 .extra1         = SYSCTL_ZERO,
704                 .extra2         = SYSCTL_ONE,
705         },
706         {
707                 .procname       = "ip_default_ttl",
708                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
709                 .maxlen         = sizeof(int),
710                 .mode           = 0644,
711                 .proc_handler   = proc_dointvec_minmax,
712                 .extra1         = &ip_ttl_min,
713                 .extra2         = &ip_ttl_max,
714         },
715         {
716                 .procname       = "ip_local_port_range",
717                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
718                 .data           = &init_net.ipv4.ip_local_ports.range,
719                 .mode           = 0644,
720                 .proc_handler   = ipv4_local_port_range,
721         },
722         {
723                 .procname       = "ip_local_reserved_ports",
724                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
725                 .maxlen         = 65536,
726                 .mode           = 0644,
727                 .proc_handler   = proc_do_large_bitmap,
728         },
729         {
730                 .procname       = "ip_no_pmtu_disc",
731                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
732                 .maxlen         = sizeof(int),
733                 .mode           = 0644,
734                 .proc_handler   = proc_dointvec
735         },
736         {
737                 .procname       = "ip_forward_use_pmtu",
738                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
739                 .maxlen         = sizeof(int),
740                 .mode           = 0644,
741                 .proc_handler   = proc_dointvec,
742         },
743         {
744                 .procname       = "ip_forward_update_priority",
745                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
746                 .maxlen         = sizeof(int),
747                 .mode           = 0644,
748                 .proc_handler   = ipv4_fwd_update_priority,
749                 .extra1         = SYSCTL_ZERO,
750                 .extra2         = SYSCTL_ONE,
751         },
752         {
753                 .procname       = "ip_nonlocal_bind",
754                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
755                 .maxlen         = sizeof(int),
756                 .mode           = 0644,
757                 .proc_handler   = proc_dointvec
758         },
759         {
760                 .procname       = "ip_autobind_reuse",
761                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
762                 .maxlen         = sizeof(int),
763                 .mode           = 0644,
764                 .proc_handler   = proc_dointvec_minmax,
765                 .extra1         = SYSCTL_ZERO,
766                 .extra2         = SYSCTL_ONE,
767         },
768         {
769                 .procname       = "fwmark_reflect",
770                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
771                 .maxlen         = sizeof(int),
772                 .mode           = 0644,
773                 .proc_handler   = proc_dointvec,
774         },
775         {
776                 .procname       = "tcp_fwmark_accept",
777                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
778                 .maxlen         = sizeof(int),
779                 .mode           = 0644,
780                 .proc_handler   = proc_dointvec,
781         },
782 #ifdef CONFIG_NET_L3_MASTER_DEV
783         {
784                 .procname       = "tcp_l3mdev_accept",
785                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
786                 .maxlen         = sizeof(int),
787                 .mode           = 0644,
788                 .proc_handler   = proc_dointvec_minmax,
789                 .extra1         = SYSCTL_ZERO,
790                 .extra2         = SYSCTL_ONE,
791         },
792 #endif
793         {
794                 .procname       = "tcp_mtu_probing",
795                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
796                 .maxlen         = sizeof(int),
797                 .mode           = 0644,
798                 .proc_handler   = proc_dointvec,
799         },
800         {
801                 .procname       = "tcp_base_mss",
802                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
803                 .maxlen         = sizeof(int),
804                 .mode           = 0644,
805                 .proc_handler   = proc_dointvec,
806         },
807         {
808                 .procname       = "tcp_min_snd_mss",
809                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
810                 .maxlen         = sizeof(int),
811                 .mode           = 0644,
812                 .proc_handler   = proc_dointvec_minmax,
813                 .extra1         = &tcp_min_snd_mss_min,
814                 .extra2         = &tcp_min_snd_mss_max,
815         },
816         {
817                 .procname       = "tcp_mtu_probe_floor",
818                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
819                 .maxlen         = sizeof(int),
820                 .mode           = 0644,
821                 .proc_handler   = proc_dointvec_minmax,
822                 .extra1         = &tcp_min_snd_mss_min,
823                 .extra2         = &tcp_min_snd_mss_max,
824         },
825         {
826                 .procname       = "tcp_probe_threshold",
827                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
828                 .maxlen         = sizeof(int),
829                 .mode           = 0644,
830                 .proc_handler   = proc_dointvec,
831         },
832         {
833                 .procname       = "tcp_probe_interval",
834                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
835                 .maxlen         = sizeof(u32),
836                 .mode           = 0644,
837                 .proc_handler   = proc_douintvec_minmax,
838                 .extra2         = &u32_max_div_HZ,
839         },
840         {
841                 .procname       = "igmp_link_local_mcast_reports",
842                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
843                 .maxlen         = sizeof(int),
844                 .mode           = 0644,
845                 .proc_handler   = proc_dointvec
846         },
847         {
848                 .procname       = "igmp_max_memberships",
849                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
850                 .maxlen         = sizeof(int),
851                 .mode           = 0644,
852                 .proc_handler   = proc_dointvec
853         },
854         {
855                 .procname       = "igmp_max_msf",
856                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
857                 .maxlen         = sizeof(int),
858                 .mode           = 0644,
859                 .proc_handler   = proc_dointvec
860         },
861 #ifdef CONFIG_IP_MULTICAST
862         {
863                 .procname       = "igmp_qrv",
864                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
865                 .maxlen         = sizeof(int),
866                 .mode           = 0644,
867                 .proc_handler   = proc_dointvec_minmax,
868                 .extra1         = SYSCTL_ONE
869         },
870 #endif
871         {
872                 .procname       = "tcp_congestion_control",
873                 .data           = &init_net.ipv4.tcp_congestion_control,
874                 .mode           = 0644,
875                 .maxlen         = TCP_CA_NAME_MAX,
876                 .proc_handler   = proc_tcp_congestion_control,
877         },
878         {
879                 .procname       = "tcp_available_congestion_control",
880                 .maxlen         = TCP_CA_BUF_MAX,
881                 .mode           = 0444,
882                 .proc_handler   = proc_tcp_available_congestion_control,
883         },
884         {
885                 .procname       = "tcp_allowed_congestion_control",
886                 .maxlen         = TCP_CA_BUF_MAX,
887                 .mode           = 0644,
888                 .proc_handler   = proc_allowed_congestion_control,
889         },
890         {
891                 .procname       = "tcp_keepalive_time",
892                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
893                 .maxlen         = sizeof(int),
894                 .mode           = 0644,
895                 .proc_handler   = proc_dointvec_jiffies,
896         },
897         {
898                 .procname       = "tcp_keepalive_probes",
899                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
900                 .maxlen         = sizeof(int),
901                 .mode           = 0644,
902                 .proc_handler   = proc_dointvec
903         },
904         {
905                 .procname       = "tcp_keepalive_intvl",
906                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
907                 .maxlen         = sizeof(int),
908                 .mode           = 0644,
909                 .proc_handler   = proc_dointvec_jiffies,
910         },
911         {
912                 .procname       = "tcp_syn_retries",
913                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
914                 .maxlen         = sizeof(int),
915                 .mode           = 0644,
916                 .proc_handler   = proc_dointvec_minmax,
917                 .extra1         = &tcp_syn_retries_min,
918                 .extra2         = &tcp_syn_retries_max
919         },
920         {
921                 .procname       = "tcp_synack_retries",
922                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
923                 .maxlen         = sizeof(int),
924                 .mode           = 0644,
925                 .proc_handler   = proc_dointvec
926         },
927 #ifdef CONFIG_SYN_COOKIES
928         {
929                 .procname       = "tcp_syncookies",
930                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
931                 .maxlen         = sizeof(int),
932                 .mode           = 0644,
933                 .proc_handler   = proc_dointvec
934         },
935 #endif
936         {
937                 .procname       = "tcp_reordering",
938                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
939                 .maxlen         = sizeof(int),
940                 .mode           = 0644,
941                 .proc_handler   = proc_dointvec
942         },
943         {
944                 .procname       = "tcp_retries1",
945                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
946                 .maxlen         = sizeof(int),
947                 .mode           = 0644,
948                 .proc_handler   = proc_dointvec_minmax,
949                 .extra2         = &tcp_retr1_max
950         },
951         {
952                 .procname       = "tcp_retries2",
953                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
954                 .maxlen         = sizeof(int),
955                 .mode           = 0644,
956                 .proc_handler   = proc_dointvec
957         },
958         {
959                 .procname       = "tcp_orphan_retries",
960                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
961                 .maxlen         = sizeof(int),
962                 .mode           = 0644,
963                 .proc_handler   = proc_dointvec
964         },
965         {
966                 .procname       = "tcp_fin_timeout",
967                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
968                 .maxlen         = sizeof(int),
969                 .mode           = 0644,
970                 .proc_handler   = proc_dointvec_jiffies,
971         },
972         {
973                 .procname       = "tcp_notsent_lowat",
974                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
975                 .maxlen         = sizeof(unsigned int),
976                 .mode           = 0644,
977                 .proc_handler   = proc_douintvec,
978         },
979         {
980                 .procname       = "tcp_tw_reuse",
981                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
982                 .maxlen         = sizeof(int),
983                 .mode           = 0644,
984                 .proc_handler   = proc_dointvec_minmax,
985                 .extra1         = SYSCTL_ZERO,
986                 .extra2         = &two,
987         },
988         {
989                 .procname       = "tcp_max_tw_buckets",
990                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
991                 .maxlen         = sizeof(int),
992                 .mode           = 0644,
993                 .proc_handler   = proc_dointvec
994         },
995         {
996                 .procname       = "tcp_max_syn_backlog",
997                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
998                 .maxlen         = sizeof(int),
999                 .mode           = 0644,
1000                 .proc_handler   = proc_dointvec
1001         },
1002         {
1003                 .procname       = "tcp_fastopen",
1004                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1005                 .maxlen         = sizeof(int),
1006                 .mode           = 0644,
1007                 .proc_handler   = proc_dointvec,
1008         },
1009         {
1010                 .procname       = "tcp_fastopen_key",
1011                 .mode           = 0600,
1012                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1013                 /* maxlen to print the list of keys in hex (*2), with dashes
1014                  * separating doublewords and a comma in between keys.
1015                  */
1016                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1017                                    2 * TCP_FASTOPEN_KEY_MAX) +
1018                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1019                 .proc_handler   = proc_tcp_fastopen_key,
1020         },
1021         {
1022                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1023                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1024                 .maxlen         = sizeof(int),
1025                 .mode           = 0644,
1026                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1027                 .extra1         = SYSCTL_ZERO,
1028         },
1029 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1030         {
1031                 .procname       = "fib_multipath_use_neigh",
1032                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1033                 .maxlen         = sizeof(int),
1034                 .mode           = 0644,
1035                 .proc_handler   = proc_dointvec_minmax,
1036                 .extra1         = SYSCTL_ZERO,
1037                 .extra2         = SYSCTL_ONE,
1038         },
1039         {
1040                 .procname       = "fib_multipath_hash_policy",
1041                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1042                 .maxlen         = sizeof(int),
1043                 .mode           = 0644,
1044                 .proc_handler   = proc_fib_multipath_hash_policy,
1045                 .extra1         = SYSCTL_ZERO,
1046                 .extra2         = &two,
1047         },
1048 #endif
1049         {
1050                 .procname       = "ip_unprivileged_port_start",
1051                 .maxlen         = sizeof(int),
1052                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1053                 .mode           = 0644,
1054                 .proc_handler   = ipv4_privileged_ports,
1055         },
1056 #ifdef CONFIG_NET_L3_MASTER_DEV
1057         {
1058                 .procname       = "udp_l3mdev_accept",
1059                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1060                 .maxlen         = sizeof(int),
1061                 .mode           = 0644,
1062                 .proc_handler   = proc_dointvec_minmax,
1063                 .extra1         = SYSCTL_ZERO,
1064                 .extra2         = SYSCTL_ONE,
1065         },
1066 #endif
1067         {
1068                 .procname       = "tcp_sack",
1069                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1070                 .maxlen         = sizeof(int),
1071                 .mode           = 0644,
1072                 .proc_handler   = proc_dointvec
1073         },
1074         {
1075                 .procname       = "tcp_window_scaling",
1076                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1077                 .maxlen         = sizeof(int),
1078                 .mode           = 0644,
1079                 .proc_handler   = proc_dointvec
1080         },
1081         {
1082                 .procname       = "tcp_timestamps",
1083                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1084                 .maxlen         = sizeof(int),
1085                 .mode           = 0644,
1086                 .proc_handler   = proc_dointvec
1087         },
1088         {
1089                 .procname       = "tcp_early_retrans",
1090                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1091                 .maxlen         = sizeof(int),
1092                 .mode           = 0644,
1093                 .proc_handler   = proc_dointvec_minmax,
1094                 .extra1         = SYSCTL_ZERO,
1095                 .extra2         = &four,
1096         },
1097         {
1098                 .procname       = "tcp_recovery",
1099                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1100                 .maxlen         = sizeof(int),
1101                 .mode           = 0644,
1102                 .proc_handler   = proc_dointvec,
1103         },
1104         {
1105                 .procname       = "tcp_thin_linear_timeouts",
1106                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1107                 .maxlen         = sizeof(int),
1108                 .mode           = 0644,
1109                 .proc_handler   = proc_dointvec
1110         },
1111         {
1112                 .procname       = "tcp_slow_start_after_idle",
1113                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1114                 .maxlen         = sizeof(int),
1115                 .mode           = 0644,
1116                 .proc_handler   = proc_dointvec
1117         },
1118         {
1119                 .procname       = "tcp_retrans_collapse",
1120                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1121                 .maxlen         = sizeof(int),
1122                 .mode           = 0644,
1123                 .proc_handler   = proc_dointvec
1124         },
1125         {
1126                 .procname       = "tcp_stdurg",
1127                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1128                 .maxlen         = sizeof(int),
1129                 .mode           = 0644,
1130                 .proc_handler   = proc_dointvec
1131         },
1132         {
1133                 .procname       = "tcp_rfc1337",
1134                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1135                 .maxlen         = sizeof(int),
1136                 .mode           = 0644,
1137                 .proc_handler   = proc_dointvec
1138         },
1139         {
1140                 .procname       = "tcp_abort_on_overflow",
1141                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1142                 .maxlen         = sizeof(int),
1143                 .mode           = 0644,
1144                 .proc_handler   = proc_dointvec
1145         },
1146         {
1147                 .procname       = "tcp_fack",
1148                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1149                 .maxlen         = sizeof(int),
1150                 .mode           = 0644,
1151                 .proc_handler   = proc_dointvec
1152         },
1153         {
1154                 .procname       = "tcp_max_reordering",
1155                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1156                 .maxlen         = sizeof(int),
1157                 .mode           = 0644,
1158                 .proc_handler   = proc_dointvec
1159         },
1160         {
1161                 .procname       = "tcp_dsack",
1162                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1163                 .maxlen         = sizeof(int),
1164                 .mode           = 0644,
1165                 .proc_handler   = proc_dointvec
1166         },
1167         {
1168                 .procname       = "tcp_app_win",
1169                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1170                 .maxlen         = sizeof(int),
1171                 .mode           = 0644,
1172                 .proc_handler   = proc_dointvec
1173         },
1174         {
1175                 .procname       = "tcp_adv_win_scale",
1176                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1177                 .maxlen         = sizeof(int),
1178                 .mode           = 0644,
1179                 .proc_handler   = proc_dointvec_minmax,
1180                 .extra1         = &tcp_adv_win_scale_min,
1181                 .extra2         = &tcp_adv_win_scale_max,
1182         },
1183         {
1184                 .procname       = "tcp_frto",
1185                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1186                 .maxlen         = sizeof(int),
1187                 .mode           = 0644,
1188                 .proc_handler   = proc_dointvec
1189         },
1190         {
1191                 .procname       = "tcp_no_metrics_save",
1192                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1193                 .maxlen         = sizeof(int),
1194                 .mode           = 0644,
1195                 .proc_handler   = proc_dointvec,
1196         },
1197         {
1198                 .procname       = "tcp_no_ssthresh_metrics_save",
1199                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1200                 .maxlen         = sizeof(int),
1201                 .mode           = 0644,
1202                 .proc_handler   = proc_dointvec_minmax,
1203                 .extra1         = SYSCTL_ZERO,
1204                 .extra2         = SYSCTL_ONE,
1205         },
1206         {
1207                 .procname       = "tcp_moderate_rcvbuf",
1208                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1209                 .maxlen         = sizeof(int),
1210                 .mode           = 0644,
1211                 .proc_handler   = proc_dointvec,
1212         },
1213         {
1214                 .procname       = "tcp_tso_win_divisor",
1215                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1216                 .maxlen         = sizeof(int),
1217                 .mode           = 0644,
1218                 .proc_handler   = proc_dointvec,
1219         },
1220         {
1221                 .procname       = "tcp_workaround_signed_windows",
1222                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1223                 .maxlen         = sizeof(int),
1224                 .mode           = 0644,
1225                 .proc_handler   = proc_dointvec
1226         },
1227         {
1228                 .procname       = "tcp_limit_output_bytes",
1229                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1230                 .maxlen         = sizeof(int),
1231                 .mode           = 0644,
1232                 .proc_handler   = proc_dointvec
1233         },
1234         {
1235                 .procname       = "tcp_challenge_ack_limit",
1236                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1237                 .maxlen         = sizeof(int),
1238                 .mode           = 0644,
1239                 .proc_handler   = proc_dointvec
1240         },
1241         {
1242                 .procname       = "tcp_min_tso_segs",
1243                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1244                 .maxlen         = sizeof(int),
1245                 .mode           = 0644,
1246                 .proc_handler   = proc_dointvec_minmax,
1247                 .extra1         = SYSCTL_ONE,
1248                 .extra2         = &gso_max_segs,
1249         },
1250         {
1251                 .procname       = "tcp_min_rtt_wlen",
1252                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1253                 .maxlen         = sizeof(int),
1254                 .mode           = 0644,
1255                 .proc_handler   = proc_dointvec_minmax,
1256                 .extra1         = SYSCTL_ZERO,
1257                 .extra2         = &one_day_secs
1258         },
1259         {
1260                 .procname       = "tcp_autocorking",
1261                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1262                 .maxlen         = sizeof(int),
1263                 .mode           = 0644,
1264                 .proc_handler   = proc_dointvec_minmax,
1265                 .extra1         = SYSCTL_ZERO,
1266                 .extra2         = SYSCTL_ONE,
1267         },
1268         {
1269                 .procname       = "tcp_invalid_ratelimit",
1270                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1271                 .maxlen         = sizeof(int),
1272                 .mode           = 0644,
1273                 .proc_handler   = proc_dointvec_ms_jiffies,
1274         },
1275         {
1276                 .procname       = "tcp_pacing_ss_ratio",
1277                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1278                 .maxlen         = sizeof(int),
1279                 .mode           = 0644,
1280                 .proc_handler   = proc_dointvec_minmax,
1281                 .extra1         = SYSCTL_ZERO,
1282                 .extra2         = &thousand,
1283         },
1284         {
1285                 .procname       = "tcp_pacing_ca_ratio",
1286                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1287                 .maxlen         = sizeof(int),
1288                 .mode           = 0644,
1289                 .proc_handler   = proc_dointvec_minmax,
1290                 .extra1         = SYSCTL_ZERO,
1291                 .extra2         = &thousand,
1292         },
1293         {
1294                 .procname       = "tcp_wmem",
1295                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1296                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1297                 .mode           = 0644,
1298                 .proc_handler   = proc_dointvec_minmax,
1299                 .extra1         = SYSCTL_ONE,
1300         },
1301         {
1302                 .procname       = "tcp_rmem",
1303                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1304                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1305                 .mode           = 0644,
1306                 .proc_handler   = proc_dointvec_minmax,
1307                 .extra1         = SYSCTL_ONE,
1308         },
1309         {
1310                 .procname       = "tcp_comp_sack_delay_ns",
1311                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1312                 .maxlen         = sizeof(unsigned long),
1313                 .mode           = 0644,
1314                 .proc_handler   = proc_doulongvec_minmax,
1315         },
1316         {
1317                 .procname       = "tcp_comp_sack_slack_ns",
1318                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1319                 .maxlen         = sizeof(unsigned long),
1320                 .mode           = 0644,
1321                 .proc_handler   = proc_doulongvec_minmax,
1322         },
1323         {
1324                 .procname       = "tcp_comp_sack_nr",
1325                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1326                 .maxlen         = sizeof(int),
1327                 .mode           = 0644,
1328                 .proc_handler   = proc_dointvec_minmax,
1329                 .extra1         = SYSCTL_ZERO,
1330                 .extra2         = &comp_sack_nr_max,
1331         },
1332         {
1333                 .procname       = "tcp_reflect_tos",
1334                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1335                 .maxlen         = sizeof(int),
1336                 .mode           = 0644,
1337                 .proc_handler   = proc_dointvec_minmax,
1338                 .extra1         = SYSCTL_ZERO,
1339                 .extra2         = SYSCTL_ONE,
1340         },
1341         {
1342                 .procname       = "udp_rmem_min",
1343                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1344                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1345                 .mode           = 0644,
1346                 .proc_handler   = proc_dointvec_minmax,
1347                 .extra1         = SYSCTL_ONE
1348         },
1349         {
1350                 .procname       = "udp_wmem_min",
1351                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1352                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1353                 .mode           = 0644,
1354                 .proc_handler   = proc_dointvec_minmax,
1355                 .extra1         = SYSCTL_ONE
1356         },
1357         { }
1358 };
1359
1360 static __net_init int ipv4_sysctl_init_net(struct net *net)
1361 {
1362         struct ctl_table *table;
1363
1364         table = ipv4_net_table;
1365         if (!net_eq(net, &init_net)) {
1366                 int i;
1367
1368                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1369                 if (!table)
1370                         goto err_alloc;
1371
1372                 /* Update the variables to point into the current struct net */
1373                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1374                         table[i].data += (void *)net - (void *)&init_net;
1375         }
1376
1377         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1378         if (!net->ipv4.ipv4_hdr)
1379                 goto err_reg;
1380
1381         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1382         if (!net->ipv4.sysctl_local_reserved_ports)
1383                 goto err_ports;
1384
1385         return 0;
1386
1387 err_ports:
1388         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1389 err_reg:
1390         if (!net_eq(net, &init_net))
1391                 kfree(table);
1392 err_alloc:
1393         return -ENOMEM;
1394 }
1395
1396 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1397 {
1398         struct ctl_table *table;
1399
1400         kfree(net->ipv4.sysctl_local_reserved_ports);
1401         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1402         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1403         kfree(table);
1404 }
1405
1406 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1407         .init = ipv4_sysctl_init_net,
1408         .exit = ipv4_sysctl_exit_net,
1409 };
1410
1411 static __init int sysctl_ipv4_init(void)
1412 {
1413         struct ctl_table_header *hdr;
1414
1415         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1416         if (!hdr)
1417                 return -ENOMEM;
1418
1419         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1420                 unregister_net_sysctl_table(hdr);
1421                 return -ENOMEM;
1422         }
1423
1424         return 0;
1425 }
1426
1427 __initcall(sysctl_ipv4_init);