Merge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[firefly-linux-kernel-4.4.55.git] / net / ipv4 / sysctl_net_ipv4.c
1 /*
2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
3  *
4  * Begun April 1, 1996, Mike Shaver.
5  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
6  */
7
8 #include <linux/mm.h>
9 #include <linux/module.h>
10 #include <linux/sysctl.h>
11 #include <linux/igmp.h>
12 #include <linux/inetdevice.h>
13 #include <linux/seqlock.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/nsproxy.h>
17 #include <linux/swap.h>
18 #include <net/snmp.h>
19 #include <net/icmp.h>
20 #include <net/ip.h>
21 #include <net/route.h>
22 #include <net/tcp.h>
23 #include <net/udp.h>
24 #include <net/cipso_ipv4.h>
25 #include <net/inet_frag.h>
26 #include <net/ping.h>
27 #include <net/tcp_memcontrol.h>
28
29 static int zero;
30 static int one = 1;
31 static int four = 4;
32 static int gso_max_segs = GSO_MAX_SEGS;
33 static int tcp_retr1_max = 255;
34 static int ip_local_port_range_min[] = { 1, 1 };
35 static int ip_local_port_range_max[] = { 65535, 65535 };
36 static int tcp_adv_win_scale_min = -31;
37 static int tcp_adv_win_scale_max = 31;
38 static int ip_ttl_min = 1;
39 static int ip_ttl_max = 255;
40 static int tcp_syn_retries_min = 1;
41 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
42 static int ip_ping_group_range_min[] = { 0, 0 };
43 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
44
45 /* Update system visible IP port range */
46 static void set_local_port_range(struct net *net, int range[2])
47 {
48         write_seqlock(&net->ipv4.ip_local_ports.lock);
49         net->ipv4.ip_local_ports.range[0] = range[0];
50         net->ipv4.ip_local_ports.range[1] = range[1];
51         write_sequnlock(&net->ipv4.ip_local_ports.lock);
52 }
53
54 /* Validate changes from /proc interface. */
55 static int ipv4_local_port_range(struct ctl_table *table, int write,
56                                  void __user *buffer,
57                                  size_t *lenp, loff_t *ppos)
58 {
59         struct net *net =
60                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
61         int ret;
62         int range[2];
63         struct ctl_table tmp = {
64                 .data = &range,
65                 .maxlen = sizeof(range),
66                 .mode = table->mode,
67                 .extra1 = &ip_local_port_range_min,
68                 .extra2 = &ip_local_port_range_max,
69         };
70
71         inet_get_local_port_range(net, &range[0], &range[1]);
72
73         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
74
75         if (write && ret == 0) {
76                 if (range[1] < range[0])
77                         ret = -EINVAL;
78                 else
79                         set_local_port_range(net, range);
80         }
81
82         return ret;
83 }
84
85
86 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
87 {
88         kgid_t *data = table->data;
89         struct net *net =
90                 container_of(table->data, struct net, ipv4.ping_group_range.range);
91         unsigned int seq;
92         do {
93                 seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
94
95                 *low = data[0];
96                 *high = data[1];
97         } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
98 }
99
100 /* Update system visible IP port range */
101 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
102 {
103         kgid_t *data = table->data;
104         struct net *net =
105                 container_of(table->data, struct net, ipv4.ping_group_range.range);
106         write_seqlock(&net->ipv4.ip_local_ports.lock);
107         data[0] = low;
108         data[1] = high;
109         write_sequnlock(&net->ipv4.ip_local_ports.lock);
110 }
111
112 /* Validate changes from /proc interface. */
113 static int ipv4_ping_group_range(struct ctl_table *table, int write,
114                                  void __user *buffer,
115                                  size_t *lenp, loff_t *ppos)
116 {
117         struct user_namespace *user_ns = current_user_ns();
118         int ret;
119         gid_t urange[2];
120         kgid_t low, high;
121         struct ctl_table tmp = {
122                 .data = &urange,
123                 .maxlen = sizeof(urange),
124                 .mode = table->mode,
125                 .extra1 = &ip_ping_group_range_min,
126                 .extra2 = &ip_ping_group_range_max,
127         };
128
129         inet_get_ping_group_range_table(table, &low, &high);
130         urange[0] = from_kgid_munged(user_ns, low);
131         urange[1] = from_kgid_munged(user_ns, high);
132         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
133
134         if (write && ret == 0) {
135                 low = make_kgid(user_ns, urange[0]);
136                 high = make_kgid(user_ns, urange[1]);
137                 if (!gid_valid(low) || !gid_valid(high) ||
138                     (urange[1] < urange[0]) || gid_lt(high, low)) {
139                         low = make_kgid(&init_user_ns, 1);
140                         high = make_kgid(&init_user_ns, 0);
141                 }
142                 set_ping_group_range(table, low, high);
143         }
144
145         return ret;
146 }
147
148 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
149                                        void __user *buffer, size_t *lenp, loff_t *ppos)
150 {
151         char val[TCP_CA_NAME_MAX];
152         struct ctl_table tbl = {
153                 .data = val,
154                 .maxlen = TCP_CA_NAME_MAX,
155         };
156         int ret;
157
158         tcp_get_default_congestion_control(val);
159
160         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
161         if (write && ret == 0)
162                 ret = tcp_set_default_congestion_control(val);
163         return ret;
164 }
165
166 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
167                                                  int write,
168                                                  void __user *buffer, size_t *lenp,
169                                                  loff_t *ppos)
170 {
171         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
172         int ret;
173
174         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
175         if (!tbl.data)
176                 return -ENOMEM;
177         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
178         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
179         kfree(tbl.data);
180         return ret;
181 }
182
183 static int proc_allowed_congestion_control(struct ctl_table *ctl,
184                                            int write,
185                                            void __user *buffer, size_t *lenp,
186                                            loff_t *ppos)
187 {
188         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
189         int ret;
190
191         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
192         if (!tbl.data)
193                 return -ENOMEM;
194
195         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
196         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
197         if (write && ret == 0)
198                 ret = tcp_set_allowed_congestion_control(tbl.data);
199         kfree(tbl.data);
200         return ret;
201 }
202
203 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
204                                  void __user *buffer, size_t *lenp,
205                                  loff_t *ppos)
206 {
207         struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
208         struct tcp_fastopen_context *ctxt;
209         int ret;
210         u32  user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
211
212         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
213         if (!tbl.data)
214                 return -ENOMEM;
215
216         rcu_read_lock();
217         ctxt = rcu_dereference(tcp_fastopen_ctx);
218         if (ctxt)
219                 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
220         else
221                 memset(user_key, 0, sizeof(user_key));
222         rcu_read_unlock();
223
224         snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
225                 user_key[0], user_key[1], user_key[2], user_key[3]);
226         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
227
228         if (write && ret == 0) {
229                 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
230                            user_key + 2, user_key + 3) != 4) {
231                         ret = -EINVAL;
232                         goto bad_key;
233                 }
234                 /* Generate a dummy secret but don't publish it. This
235                  * is needed so we don't regenerate a new key on the
236                  * first invocation of tcp_fastopen_cookie_gen
237                  */
238                 tcp_fastopen_init_key_once(false);
239                 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
240         }
241
242 bad_key:
243         pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
244                user_key[0], user_key[1], user_key[2], user_key[3],
245                (char *)tbl.data, ret);
246         kfree(tbl.data);
247         return ret;
248 }
249
250 static struct ctl_table ipv4_table[] = {
251         {
252                 .procname       = "tcp_timestamps",
253                 .data           = &sysctl_tcp_timestamps,
254                 .maxlen         = sizeof(int),
255                 .mode           = 0644,
256                 .proc_handler   = proc_dointvec
257         },
258         {
259                 .procname       = "tcp_window_scaling",
260                 .data           = &sysctl_tcp_window_scaling,
261                 .maxlen         = sizeof(int),
262                 .mode           = 0644,
263                 .proc_handler   = proc_dointvec
264         },
265         {
266                 .procname       = "tcp_sack",
267                 .data           = &sysctl_tcp_sack,
268                 .maxlen         = sizeof(int),
269                 .mode           = 0644,
270                 .proc_handler   = proc_dointvec
271         },
272         {
273                 .procname       = "tcp_retrans_collapse",
274                 .data           = &sysctl_tcp_retrans_collapse,
275                 .maxlen         = sizeof(int),
276                 .mode           = 0644,
277                 .proc_handler   = proc_dointvec
278         },
279         {
280                 .procname       = "ip_default_ttl",
281                 .data           = &sysctl_ip_default_ttl,
282                 .maxlen         = sizeof(int),
283                 .mode           = 0644,
284                 .proc_handler   = proc_dointvec_minmax,
285                 .extra1         = &ip_ttl_min,
286                 .extra2         = &ip_ttl_max,
287         },
288         {
289                 .procname       = "tcp_syn_retries",
290                 .data           = &sysctl_tcp_syn_retries,
291                 .maxlen         = sizeof(int),
292                 .mode           = 0644,
293                 .proc_handler   = proc_dointvec_minmax,
294                 .extra1         = &tcp_syn_retries_min,
295                 .extra2         = &tcp_syn_retries_max
296         },
297         {
298                 .procname       = "tcp_synack_retries",
299                 .data           = &sysctl_tcp_synack_retries,
300                 .maxlen         = sizeof(int),
301                 .mode           = 0644,
302                 .proc_handler   = proc_dointvec
303         },
304         {
305                 .procname       = "tcp_max_orphans",
306                 .data           = &sysctl_tcp_max_orphans,
307                 .maxlen         = sizeof(int),
308                 .mode           = 0644,
309                 .proc_handler   = proc_dointvec
310         },
311         {
312                 .procname       = "tcp_max_tw_buckets",
313                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
314                 .maxlen         = sizeof(int),
315                 .mode           = 0644,
316                 .proc_handler   = proc_dointvec
317         },
318         {
319                 .procname       = "ip_early_demux",
320                 .data           = &sysctl_ip_early_demux,
321                 .maxlen         = sizeof(int),
322                 .mode           = 0644,
323                 .proc_handler   = proc_dointvec
324         },
325         {
326                 .procname       = "ip_dynaddr",
327                 .data           = &sysctl_ip_dynaddr,
328                 .maxlen         = sizeof(int),
329                 .mode           = 0644,
330                 .proc_handler   = proc_dointvec
331         },
332         {
333                 .procname       = "tcp_keepalive_time",
334                 .data           = &sysctl_tcp_keepalive_time,
335                 .maxlen         = sizeof(int),
336                 .mode           = 0644,
337                 .proc_handler   = proc_dointvec_jiffies,
338         },
339         {
340                 .procname       = "tcp_keepalive_probes",
341                 .data           = &sysctl_tcp_keepalive_probes,
342                 .maxlen         = sizeof(int),
343                 .mode           = 0644,
344                 .proc_handler   = proc_dointvec
345         },
346         {
347                 .procname       = "tcp_keepalive_intvl",
348                 .data           = &sysctl_tcp_keepalive_intvl,
349                 .maxlen         = sizeof(int),
350                 .mode           = 0644,
351                 .proc_handler   = proc_dointvec_jiffies,
352         },
353         {
354                 .procname       = "tcp_retries1",
355                 .data           = &sysctl_tcp_retries1,
356                 .maxlen         = sizeof(int),
357                 .mode           = 0644,
358                 .proc_handler   = proc_dointvec_minmax,
359                 .extra2         = &tcp_retr1_max
360         },
361         {
362                 .procname       = "tcp_retries2",
363                 .data           = &sysctl_tcp_retries2,
364                 .maxlen         = sizeof(int),
365                 .mode           = 0644,
366                 .proc_handler   = proc_dointvec
367         },
368         {
369                 .procname       = "tcp_fin_timeout",
370                 .data           = &sysctl_tcp_fin_timeout,
371                 .maxlen         = sizeof(int),
372                 .mode           = 0644,
373                 .proc_handler   = proc_dointvec_jiffies,
374         },
375 #ifdef CONFIG_SYN_COOKIES
376         {
377                 .procname       = "tcp_syncookies",
378                 .data           = &sysctl_tcp_syncookies,
379                 .maxlen         = sizeof(int),
380                 .mode           = 0644,
381                 .proc_handler   = proc_dointvec
382         },
383 #endif
384         {
385                 .procname       = "tcp_fastopen",
386                 .data           = &sysctl_tcp_fastopen,
387                 .maxlen         = sizeof(int),
388                 .mode           = 0644,
389                 .proc_handler   = proc_dointvec,
390         },
391         {
392                 .procname       = "tcp_fastopen_key",
393                 .mode           = 0600,
394                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
395                 .proc_handler   = proc_tcp_fastopen_key,
396         },
397         {
398                 .procname       = "tcp_tw_recycle",
399                 .data           = &tcp_death_row.sysctl_tw_recycle,
400                 .maxlen         = sizeof(int),
401                 .mode           = 0644,
402                 .proc_handler   = proc_dointvec
403         },
404         {
405                 .procname       = "tcp_abort_on_overflow",
406                 .data           = &sysctl_tcp_abort_on_overflow,
407                 .maxlen         = sizeof(int),
408                 .mode           = 0644,
409                 .proc_handler   = proc_dointvec
410         },
411         {
412                 .procname       = "tcp_stdurg",
413                 .data           = &sysctl_tcp_stdurg,
414                 .maxlen         = sizeof(int),
415                 .mode           = 0644,
416                 .proc_handler   = proc_dointvec
417         },
418         {
419                 .procname       = "tcp_rfc1337",
420                 .data           = &sysctl_tcp_rfc1337,
421                 .maxlen         = sizeof(int),
422                 .mode           = 0644,
423                 .proc_handler   = proc_dointvec
424         },
425         {
426                 .procname       = "tcp_max_syn_backlog",
427                 .data           = &sysctl_max_syn_backlog,
428                 .maxlen         = sizeof(int),
429                 .mode           = 0644,
430                 .proc_handler   = proc_dointvec
431         },
432         {
433                 .procname       = "igmp_max_memberships",
434                 .data           = &sysctl_igmp_max_memberships,
435                 .maxlen         = sizeof(int),
436                 .mode           = 0644,
437                 .proc_handler   = proc_dointvec
438         },
439         {
440                 .procname       = "igmp_max_msf",
441                 .data           = &sysctl_igmp_max_msf,
442                 .maxlen         = sizeof(int),
443                 .mode           = 0644,
444                 .proc_handler   = proc_dointvec
445         },
446 #ifdef CONFIG_IP_MULTICAST
447         {
448                 .procname       = "igmp_qrv",
449                 .data           = &sysctl_igmp_qrv,
450                 .maxlen         = sizeof(int),
451                 .mode           = 0644,
452                 .proc_handler   = proc_dointvec_minmax,
453                 .extra1         = &one
454         },
455 #endif
456         {
457                 .procname       = "inet_peer_threshold",
458                 .data           = &inet_peer_threshold,
459                 .maxlen         = sizeof(int),
460                 .mode           = 0644,
461                 .proc_handler   = proc_dointvec
462         },
463         {
464                 .procname       = "inet_peer_minttl",
465                 .data           = &inet_peer_minttl,
466                 .maxlen         = sizeof(int),
467                 .mode           = 0644,
468                 .proc_handler   = proc_dointvec_jiffies,
469         },
470         {
471                 .procname       = "inet_peer_maxttl",
472                 .data           = &inet_peer_maxttl,
473                 .maxlen         = sizeof(int),
474                 .mode           = 0644,
475                 .proc_handler   = proc_dointvec_jiffies,
476         },
477         {
478                 .procname       = "tcp_orphan_retries",
479                 .data           = &sysctl_tcp_orphan_retries,
480                 .maxlen         = sizeof(int),
481                 .mode           = 0644,
482                 .proc_handler   = proc_dointvec
483         },
484         {
485                 .procname       = "tcp_fack",
486                 .data           = &sysctl_tcp_fack,
487                 .maxlen         = sizeof(int),
488                 .mode           = 0644,
489                 .proc_handler   = proc_dointvec
490         },
491         {
492                 .procname       = "tcp_reordering",
493                 .data           = &sysctl_tcp_reordering,
494                 .maxlen         = sizeof(int),
495                 .mode           = 0644,
496                 .proc_handler   = proc_dointvec
497         },
498         {
499                 .procname       = "tcp_dsack",
500                 .data           = &sysctl_tcp_dsack,
501                 .maxlen         = sizeof(int),
502                 .mode           = 0644,
503                 .proc_handler   = proc_dointvec
504         },
505         {
506                 .procname       = "tcp_mem",
507                 .maxlen         = sizeof(sysctl_tcp_mem),
508                 .data           = &sysctl_tcp_mem,
509                 .mode           = 0644,
510                 .proc_handler   = proc_doulongvec_minmax,
511         },
512         {
513                 .procname       = "tcp_wmem",
514                 .data           = &sysctl_tcp_wmem,
515                 .maxlen         = sizeof(sysctl_tcp_wmem),
516                 .mode           = 0644,
517                 .proc_handler   = proc_dointvec_minmax,
518                 .extra1         = &one,
519         },
520         {
521                 .procname       = "tcp_notsent_lowat",
522                 .data           = &sysctl_tcp_notsent_lowat,
523                 .maxlen         = sizeof(sysctl_tcp_notsent_lowat),
524                 .mode           = 0644,
525                 .proc_handler   = proc_dointvec,
526         },
527         {
528                 .procname       = "tcp_rmem",
529                 .data           = &sysctl_tcp_rmem,
530                 .maxlen         = sizeof(sysctl_tcp_rmem),
531                 .mode           = 0644,
532                 .proc_handler   = proc_dointvec_minmax,
533                 .extra1         = &one,
534         },
535         {
536                 .procname       = "tcp_app_win",
537                 .data           = &sysctl_tcp_app_win,
538                 .maxlen         = sizeof(int),
539                 .mode           = 0644,
540                 .proc_handler   = proc_dointvec
541         },
542         {
543                 .procname       = "tcp_adv_win_scale",
544                 .data           = &sysctl_tcp_adv_win_scale,
545                 .maxlen         = sizeof(int),
546                 .mode           = 0644,
547                 .proc_handler   = proc_dointvec_minmax,
548                 .extra1         = &tcp_adv_win_scale_min,
549                 .extra2         = &tcp_adv_win_scale_max,
550         },
551         {
552                 .procname       = "tcp_tw_reuse",
553                 .data           = &sysctl_tcp_tw_reuse,
554                 .maxlen         = sizeof(int),
555                 .mode           = 0644,
556                 .proc_handler   = proc_dointvec
557         },
558         {
559                 .procname       = "tcp_frto",
560                 .data           = &sysctl_tcp_frto,
561                 .maxlen         = sizeof(int),
562                 .mode           = 0644,
563                 .proc_handler   = proc_dointvec
564         },
565         {
566                 .procname       = "tcp_low_latency",
567                 .data           = &sysctl_tcp_low_latency,
568                 .maxlen         = sizeof(int),
569                 .mode           = 0644,
570                 .proc_handler   = proc_dointvec
571         },
572         {
573                 .procname       = "tcp_no_metrics_save",
574                 .data           = &sysctl_tcp_nometrics_save,
575                 .maxlen         = sizeof(int),
576                 .mode           = 0644,
577                 .proc_handler   = proc_dointvec,
578         },
579         {
580                 .procname       = "tcp_moderate_rcvbuf",
581                 .data           = &sysctl_tcp_moderate_rcvbuf,
582                 .maxlen         = sizeof(int),
583                 .mode           = 0644,
584                 .proc_handler   = proc_dointvec,
585         },
586         {
587                 .procname       = "tcp_tso_win_divisor",
588                 .data           = &sysctl_tcp_tso_win_divisor,
589                 .maxlen         = sizeof(int),
590                 .mode           = 0644,
591                 .proc_handler   = proc_dointvec,
592         },
593         {
594                 .procname       = "tcp_congestion_control",
595                 .mode           = 0644,
596                 .maxlen         = TCP_CA_NAME_MAX,
597                 .proc_handler   = proc_tcp_congestion_control,
598         },
599         {
600                 .procname       = "tcp_mtu_probing",
601                 .data           = &sysctl_tcp_mtu_probing,
602                 .maxlen         = sizeof(int),
603                 .mode           = 0644,
604                 .proc_handler   = proc_dointvec,
605         },
606         {
607                 .procname       = "tcp_base_mss",
608                 .data           = &sysctl_tcp_base_mss,
609                 .maxlen         = sizeof(int),
610                 .mode           = 0644,
611                 .proc_handler   = proc_dointvec,
612         },
613         {
614                 .procname       = "tcp_workaround_signed_windows",
615                 .data           = &sysctl_tcp_workaround_signed_windows,
616                 .maxlen         = sizeof(int),
617                 .mode           = 0644,
618                 .proc_handler   = proc_dointvec
619         },
620         {
621                 .procname       = "tcp_limit_output_bytes",
622                 .data           = &sysctl_tcp_limit_output_bytes,
623                 .maxlen         = sizeof(int),
624                 .mode           = 0644,
625                 .proc_handler   = proc_dointvec
626         },
627         {
628                 .procname       = "tcp_challenge_ack_limit",
629                 .data           = &sysctl_tcp_challenge_ack_limit,
630                 .maxlen         = sizeof(int),
631                 .mode           = 0644,
632                 .proc_handler   = proc_dointvec
633         },
634         {
635                 .procname       = "tcp_slow_start_after_idle",
636                 .data           = &sysctl_tcp_slow_start_after_idle,
637                 .maxlen         = sizeof(int),
638                 .mode           = 0644,
639                 .proc_handler   = proc_dointvec
640         },
641 #ifdef CONFIG_NETLABEL
642         {
643                 .procname       = "cipso_cache_enable",
644                 .data           = &cipso_v4_cache_enabled,
645                 .maxlen         = sizeof(int),
646                 .mode           = 0644,
647                 .proc_handler   = proc_dointvec,
648         },
649         {
650                 .procname       = "cipso_cache_bucket_size",
651                 .data           = &cipso_v4_cache_bucketsize,
652                 .maxlen         = sizeof(int),
653                 .mode           = 0644,
654                 .proc_handler   = proc_dointvec,
655         },
656         {
657                 .procname       = "cipso_rbm_optfmt",
658                 .data           = &cipso_v4_rbm_optfmt,
659                 .maxlen         = sizeof(int),
660                 .mode           = 0644,
661                 .proc_handler   = proc_dointvec,
662         },
663         {
664                 .procname       = "cipso_rbm_strictvalid",
665                 .data           = &cipso_v4_rbm_strictvalid,
666                 .maxlen         = sizeof(int),
667                 .mode           = 0644,
668                 .proc_handler   = proc_dointvec,
669         },
670 #endif /* CONFIG_NETLABEL */
671         {
672                 .procname       = "tcp_available_congestion_control",
673                 .maxlen         = TCP_CA_BUF_MAX,
674                 .mode           = 0444,
675                 .proc_handler   = proc_tcp_available_congestion_control,
676         },
677         {
678                 .procname       = "tcp_allowed_congestion_control",
679                 .maxlen         = TCP_CA_BUF_MAX,
680                 .mode           = 0644,
681                 .proc_handler   = proc_allowed_congestion_control,
682         },
683         {
684                 .procname       = "tcp_thin_linear_timeouts",
685                 .data           = &sysctl_tcp_thin_linear_timeouts,
686                 .maxlen         = sizeof(int),
687                 .mode           = 0644,
688                 .proc_handler   = proc_dointvec
689         },
690         {
691                 .procname       = "tcp_thin_dupack",
692                 .data           = &sysctl_tcp_thin_dupack,
693                 .maxlen         = sizeof(int),
694                 .mode           = 0644,
695                 .proc_handler   = proc_dointvec
696         },
697         {
698                 .procname       = "tcp_early_retrans",
699                 .data           = &sysctl_tcp_early_retrans,
700                 .maxlen         = sizeof(int),
701                 .mode           = 0644,
702                 .proc_handler   = proc_dointvec_minmax,
703                 .extra1         = &zero,
704                 .extra2         = &four,
705         },
706         {
707                 .procname       = "tcp_min_tso_segs",
708                 .data           = &sysctl_tcp_min_tso_segs,
709                 .maxlen         = sizeof(int),
710                 .mode           = 0644,
711                 .proc_handler   = proc_dointvec_minmax,
712                 .extra1         = &zero,
713                 .extra2         = &gso_max_segs,
714         },
715         {
716                 .procname       = "tcp_autocorking",
717                 .data           = &sysctl_tcp_autocorking,
718                 .maxlen         = sizeof(int),
719                 .mode           = 0644,
720                 .proc_handler   = proc_dointvec_minmax,
721                 .extra1         = &zero,
722                 .extra2         = &one,
723         },
724         {
725                 .procname       = "icmp_msgs_per_sec",
726                 .data           = &sysctl_icmp_msgs_per_sec,
727                 .maxlen         = sizeof(int),
728                 .mode           = 0644,
729                 .proc_handler   = proc_dointvec_minmax,
730                 .extra1         = &zero,
731         },
732         {
733                 .procname       = "icmp_msgs_burst",
734                 .data           = &sysctl_icmp_msgs_burst,
735                 .maxlen         = sizeof(int),
736                 .mode           = 0644,
737                 .proc_handler   = proc_dointvec_minmax,
738                 .extra1         = &zero,
739         },
740         {
741                 .procname       = "udp_mem",
742                 .data           = &sysctl_udp_mem,
743                 .maxlen         = sizeof(sysctl_udp_mem),
744                 .mode           = 0644,
745                 .proc_handler   = proc_doulongvec_minmax,
746         },
747         {
748                 .procname       = "udp_rmem_min",
749                 .data           = &sysctl_udp_rmem_min,
750                 .maxlen         = sizeof(sysctl_udp_rmem_min),
751                 .mode           = 0644,
752                 .proc_handler   = proc_dointvec_minmax,
753                 .extra1         = &one
754         },
755         {
756                 .procname       = "udp_wmem_min",
757                 .data           = &sysctl_udp_wmem_min,
758                 .maxlen         = sizeof(sysctl_udp_wmem_min),
759                 .mode           = 0644,
760                 .proc_handler   = proc_dointvec_minmax,
761                 .extra1         = &one
762         },
763         { }
764 };
765
766 static struct ctl_table ipv4_net_table[] = {
767         {
768                 .procname       = "icmp_echo_ignore_all",
769                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
770                 .maxlen         = sizeof(int),
771                 .mode           = 0644,
772                 .proc_handler   = proc_dointvec
773         },
774         {
775                 .procname       = "icmp_echo_ignore_broadcasts",
776                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
777                 .maxlen         = sizeof(int),
778                 .mode           = 0644,
779                 .proc_handler   = proc_dointvec
780         },
781         {
782                 .procname       = "icmp_ignore_bogus_error_responses",
783                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
784                 .maxlen         = sizeof(int),
785                 .mode           = 0644,
786                 .proc_handler   = proc_dointvec
787         },
788         {
789                 .procname       = "icmp_errors_use_inbound_ifaddr",
790                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
791                 .maxlen         = sizeof(int),
792                 .mode           = 0644,
793                 .proc_handler   = proc_dointvec
794         },
795         {
796                 .procname       = "icmp_ratelimit",
797                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
798                 .maxlen         = sizeof(int),
799                 .mode           = 0644,
800                 .proc_handler   = proc_dointvec_ms_jiffies,
801         },
802         {
803                 .procname       = "icmp_ratemask",
804                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
805                 .maxlen         = sizeof(int),
806                 .mode           = 0644,
807                 .proc_handler   = proc_dointvec
808         },
809         {
810                 .procname       = "ping_group_range",
811                 .data           = &init_net.ipv4.ping_group_range.range,
812                 .maxlen         = sizeof(gid_t)*2,
813                 .mode           = 0644,
814                 .proc_handler   = ipv4_ping_group_range,
815         },
816         {
817                 .procname       = "tcp_ecn",
818                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
819                 .maxlen         = sizeof(int),
820                 .mode           = 0644,
821                 .proc_handler   = proc_dointvec
822         },
823         {
824                 .procname       = "ip_local_port_range",
825                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
826                 .data           = &init_net.ipv4.ip_local_ports.range,
827                 .mode           = 0644,
828                 .proc_handler   = ipv4_local_port_range,
829         },
830         {
831                 .procname       = "ip_local_reserved_ports",
832                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
833                 .maxlen         = 65536,
834                 .mode           = 0644,
835                 .proc_handler   = proc_do_large_bitmap,
836         },
837         {
838                 .procname       = "ip_no_pmtu_disc",
839                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
840                 .maxlen         = sizeof(int),
841                 .mode           = 0644,
842                 .proc_handler   = proc_dointvec
843         },
844         {
845                 .procname       = "ip_forward_use_pmtu",
846                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
847                 .maxlen         = sizeof(int),
848                 .mode           = 0644,
849                 .proc_handler   = proc_dointvec,
850         },
851         {
852                 .procname       = "ip_nonlocal_bind",
853                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
854                 .maxlen         = sizeof(int),
855                 .mode           = 0644,
856                 .proc_handler   = proc_dointvec
857         },
858         {
859                 .procname       = "fwmark_reflect",
860                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
861                 .maxlen         = sizeof(int),
862                 .mode           = 0644,
863                 .proc_handler   = proc_dointvec,
864         },
865         {
866                 .procname       = "tcp_fwmark_accept",
867                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
868                 .maxlen         = sizeof(int),
869                 .mode           = 0644,
870                 .proc_handler   = proc_dointvec,
871         },
872         { }
873 };
874
875 static __net_init int ipv4_sysctl_init_net(struct net *net)
876 {
877         struct ctl_table *table;
878
879         table = ipv4_net_table;
880         if (!net_eq(net, &init_net)) {
881                 int i;
882
883                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
884                 if (table == NULL)
885                         goto err_alloc;
886
887                 /* Update the variables to point into the current struct net */
888                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
889                         table[i].data += (void *)net - (void *)&init_net;
890         }
891
892         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
893         if (net->ipv4.ipv4_hdr == NULL)
894                 goto err_reg;
895
896         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
897         if (!net->ipv4.sysctl_local_reserved_ports)
898                 goto err_ports;
899
900         return 0;
901
902 err_ports:
903         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
904 err_reg:
905         if (!net_eq(net, &init_net))
906                 kfree(table);
907 err_alloc:
908         return -ENOMEM;
909 }
910
911 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
912 {
913         struct ctl_table *table;
914
915         kfree(net->ipv4.sysctl_local_reserved_ports);
916         table = net->ipv4.ipv4_hdr->ctl_table_arg;
917         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
918         kfree(table);
919 }
920
921 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
922         .init = ipv4_sysctl_init_net,
923         .exit = ipv4_sysctl_exit_net,
924 };
925
926 static __init int sysctl_ipv4_init(void)
927 {
928         struct ctl_table_header *hdr;
929
930         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
931         if (hdr == NULL)
932                 return -ENOMEM;
933
934         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
935                 unregister_net_sysctl_table(hdr);
936                 return -ENOMEM;
937         }
938
939         return 0;
940 }
941
942 __initcall(sysctl_ipv4_init);