ipv4: fix multicast losses
[linux-2.6.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 <net/snmp.h>
18 #include <net/icmp.h>
19 #include <net/ip.h>
20 #include <net/route.h>
21 #include <net/tcp.h>
22 #include <net/udp.h>
23 #include <net/cipso_ipv4.h>
24 #include <net/inet_frag.h>
25 #include <net/ping.h>
26
27 static int zero;
28 static int tcp_retr1_max = 255;
29 static int ip_local_port_range_min[] = { 1, 1 };
30 static int ip_local_port_range_max[] = { 65535, 65535 };
31 static int tcp_adv_win_scale_min = -31;
32 static int tcp_adv_win_scale_max = 31;
33 static int ip_ttl_min = 1;
34 static int ip_ttl_max = 255;
35 static int ip_ping_group_range_min[] = { 0, 0 };
36 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
37
38 /* Update system visible IP port range */
39 static void set_local_port_range(int range[2])
40 {
41         write_seqlock(&sysctl_local_ports.lock);
42         sysctl_local_ports.range[0] = range[0];
43         sysctl_local_ports.range[1] = range[1];
44         write_sequnlock(&sysctl_local_ports.lock);
45 }
46
47 /* Validate changes from /proc interface. */
48 static int ipv4_local_port_range(ctl_table *table, int write,
49                                  void __user *buffer,
50                                  size_t *lenp, loff_t *ppos)
51 {
52         int ret;
53         int range[2];
54         ctl_table tmp = {
55                 .data = &range,
56                 .maxlen = sizeof(range),
57                 .mode = table->mode,
58                 .extra1 = &ip_local_port_range_min,
59                 .extra2 = &ip_local_port_range_max,
60         };
61
62         inet_get_local_port_range(range, range + 1);
63         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
64
65         if (write && ret == 0) {
66                 if (range[1] < range[0])
67                         ret = -EINVAL;
68                 else
69                         set_local_port_range(range);
70         }
71
72         return ret;
73 }
74
75
76 void inet_get_ping_group_range_table(struct ctl_table *table, gid_t *low, gid_t *high)
77 {
78         gid_t *data = table->data;
79         unsigned seq;
80         do {
81                 seq = read_seqbegin(&sysctl_local_ports.lock);
82
83                 *low = data[0];
84                 *high = data[1];
85         } while (read_seqretry(&sysctl_local_ports.lock, seq));
86 }
87
88 /* Update system visible IP port range */
89 static void set_ping_group_range(struct ctl_table *table, int range[2])
90 {
91         gid_t *data = table->data;
92         write_seqlock(&sysctl_local_ports.lock);
93         data[0] = range[0];
94         data[1] = range[1];
95         write_sequnlock(&sysctl_local_ports.lock);
96 }
97
98 /* Validate changes from /proc interface. */
99 static int ipv4_ping_group_range(ctl_table *table, int write,
100                                  void __user *buffer,
101                                  size_t *lenp, loff_t *ppos)
102 {
103         int ret;
104         gid_t range[2];
105         ctl_table tmp = {
106                 .data = &range,
107                 .maxlen = sizeof(range),
108                 .mode = table->mode,
109                 .extra1 = &ip_ping_group_range_min,
110                 .extra2 = &ip_ping_group_range_max,
111         };
112
113         inet_get_ping_group_range_table(table, range, range + 1);
114         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
115
116         if (write && ret == 0)
117                 set_ping_group_range(table, range);
118
119         return ret;
120 }
121
122 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
123                                        void __user *buffer, size_t *lenp, loff_t *ppos)
124 {
125         char val[TCP_CA_NAME_MAX];
126         ctl_table tbl = {
127                 .data = val,
128                 .maxlen = TCP_CA_NAME_MAX,
129         };
130         int ret;
131
132         tcp_get_default_congestion_control(val);
133
134         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
135         if (write && ret == 0)
136                 ret = tcp_set_default_congestion_control(val);
137         return ret;
138 }
139
140 static int proc_tcp_available_congestion_control(ctl_table *ctl,
141                                                  int write,
142                                                  void __user *buffer, size_t *lenp,
143                                                  loff_t *ppos)
144 {
145         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
146         int ret;
147
148         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
149         if (!tbl.data)
150                 return -ENOMEM;
151         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
152         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
153         kfree(tbl.data);
154         return ret;
155 }
156
157 static int proc_allowed_congestion_control(ctl_table *ctl,
158                                            int write,
159                                            void __user *buffer, size_t *lenp,
160                                            loff_t *ppos)
161 {
162         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
163         int ret;
164
165         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
166         if (!tbl.data)
167                 return -ENOMEM;
168
169         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
170         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
171         if (write && ret == 0)
172                 ret = tcp_set_allowed_congestion_control(tbl.data);
173         kfree(tbl.data);
174         return ret;
175 }
176
177 static struct ctl_table ipv4_table[] = {
178         {
179                 .procname       = "tcp_timestamps",
180                 .data           = &sysctl_tcp_timestamps,
181                 .maxlen         = sizeof(int),
182                 .mode           = 0644,
183                 .proc_handler   = proc_dointvec
184         },
185         {
186                 .procname       = "tcp_window_scaling",
187                 .data           = &sysctl_tcp_window_scaling,
188                 .maxlen         = sizeof(int),
189                 .mode           = 0644,
190                 .proc_handler   = proc_dointvec
191         },
192         {
193                 .procname       = "tcp_sack",
194                 .data           = &sysctl_tcp_sack,
195                 .maxlen         = sizeof(int),
196                 .mode           = 0644,
197                 .proc_handler   = proc_dointvec
198         },
199         {
200                 .procname       = "tcp_retrans_collapse",
201                 .data           = &sysctl_tcp_retrans_collapse,
202                 .maxlen         = sizeof(int),
203                 .mode           = 0644,
204                 .proc_handler   = proc_dointvec
205         },
206         {
207                 .procname       = "ip_default_ttl",
208                 .data           = &sysctl_ip_default_ttl,
209                 .maxlen         = sizeof(int),
210                 .mode           = 0644,
211                 .proc_handler   = proc_dointvec_minmax,
212                 .extra1         = &ip_ttl_min,
213                 .extra2         = &ip_ttl_max,
214         },
215         {
216                 .procname       = "ip_no_pmtu_disc",
217                 .data           = &ipv4_config.no_pmtu_disc,
218                 .maxlen         = sizeof(int),
219                 .mode           = 0644,
220                 .proc_handler   = proc_dointvec
221         },
222         {
223                 .procname       = "ip_nonlocal_bind",
224                 .data           = &sysctl_ip_nonlocal_bind,
225                 .maxlen         = sizeof(int),
226                 .mode           = 0644,
227                 .proc_handler   = proc_dointvec
228         },
229         {
230                 .procname       = "tcp_syn_retries",
231                 .data           = &sysctl_tcp_syn_retries,
232                 .maxlen         = sizeof(int),
233                 .mode           = 0644,
234                 .proc_handler   = proc_dointvec
235         },
236         {
237                 .procname       = "tcp_synack_retries",
238                 .data           = &sysctl_tcp_synack_retries,
239                 .maxlen         = sizeof(int),
240                 .mode           = 0644,
241                 .proc_handler   = proc_dointvec
242         },
243         {
244                 .procname       = "tcp_max_orphans",
245                 .data           = &sysctl_tcp_max_orphans,
246                 .maxlen         = sizeof(int),
247                 .mode           = 0644,
248                 .proc_handler   = proc_dointvec
249         },
250         {
251                 .procname       = "tcp_max_tw_buckets",
252                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
253                 .maxlen         = sizeof(int),
254                 .mode           = 0644,
255                 .proc_handler   = proc_dointvec
256         },
257         {
258                 .procname       = "ip_dynaddr",
259                 .data           = &sysctl_ip_dynaddr,
260                 .maxlen         = sizeof(int),
261                 .mode           = 0644,
262                 .proc_handler   = proc_dointvec
263         },
264         {
265                 .procname       = "tcp_keepalive_time",
266                 .data           = &sysctl_tcp_keepalive_time,
267                 .maxlen         = sizeof(int),
268                 .mode           = 0644,
269                 .proc_handler   = proc_dointvec_jiffies,
270         },
271         {
272                 .procname       = "tcp_keepalive_probes",
273                 .data           = &sysctl_tcp_keepalive_probes,
274                 .maxlen         = sizeof(int),
275                 .mode           = 0644,
276                 .proc_handler   = proc_dointvec
277         },
278         {
279                 .procname       = "tcp_keepalive_intvl",
280                 .data           = &sysctl_tcp_keepalive_intvl,
281                 .maxlen         = sizeof(int),
282                 .mode           = 0644,
283                 .proc_handler   = proc_dointvec_jiffies,
284         },
285         {
286                 .procname       = "tcp_retries1",
287                 .data           = &sysctl_tcp_retries1,
288                 .maxlen         = sizeof(int),
289                 .mode           = 0644,
290                 .proc_handler   = proc_dointvec_minmax,
291                 .extra2         = &tcp_retr1_max
292         },
293         {
294                 .procname       = "tcp_retries2",
295                 .data           = &sysctl_tcp_retries2,
296                 .maxlen         = sizeof(int),
297                 .mode           = 0644,
298                 .proc_handler   = proc_dointvec
299         },
300         {
301                 .procname       = "tcp_fin_timeout",
302                 .data           = &sysctl_tcp_fin_timeout,
303                 .maxlen         = sizeof(int),
304                 .mode           = 0644,
305                 .proc_handler   = proc_dointvec_jiffies,
306         },
307 #ifdef CONFIG_SYN_COOKIES
308         {
309                 .procname       = "tcp_syncookies",
310                 .data           = &sysctl_tcp_syncookies,
311                 .maxlen         = sizeof(int),
312                 .mode           = 0644,
313                 .proc_handler   = proc_dointvec
314         },
315 #endif
316         {
317                 .procname       = "tcp_tw_recycle",
318                 .data           = &tcp_death_row.sysctl_tw_recycle,
319                 .maxlen         = sizeof(int),
320                 .mode           = 0644,
321                 .proc_handler   = proc_dointvec
322         },
323         {
324                 .procname       = "tcp_abort_on_overflow",
325                 .data           = &sysctl_tcp_abort_on_overflow,
326                 .maxlen         = sizeof(int),
327                 .mode           = 0644,
328                 .proc_handler   = proc_dointvec
329         },
330         {
331                 .procname       = "tcp_stdurg",
332                 .data           = &sysctl_tcp_stdurg,
333                 .maxlen         = sizeof(int),
334                 .mode           = 0644,
335                 .proc_handler   = proc_dointvec
336         },
337         {
338                 .procname       = "tcp_rfc1337",
339                 .data           = &sysctl_tcp_rfc1337,
340                 .maxlen         = sizeof(int),
341                 .mode           = 0644,
342                 .proc_handler   = proc_dointvec
343         },
344         {
345                 .procname       = "tcp_max_syn_backlog",
346                 .data           = &sysctl_max_syn_backlog,
347                 .maxlen         = sizeof(int),
348                 .mode           = 0644,
349                 .proc_handler   = proc_dointvec
350         },
351         {
352                 .procname       = "ip_local_port_range",
353                 .data           = &sysctl_local_ports.range,
354                 .maxlen         = sizeof(sysctl_local_ports.range),
355                 .mode           = 0644,
356                 .proc_handler   = ipv4_local_port_range,
357         },
358         {
359                 .procname       = "ip_local_reserved_ports",
360                 .data           = NULL, /* initialized in sysctl_ipv4_init */
361                 .maxlen         = 65536,
362                 .mode           = 0644,
363                 .proc_handler   = proc_do_large_bitmap,
364         },
365         {
366                 .procname       = "igmp_max_memberships",
367                 .data           = &sysctl_igmp_max_memberships,
368                 .maxlen         = sizeof(int),
369                 .mode           = 0644,
370                 .proc_handler   = proc_dointvec
371         },
372         {
373                 .procname       = "igmp_max_msf",
374                 .data           = &sysctl_igmp_max_msf,
375                 .maxlen         = sizeof(int),
376                 .mode           = 0644,
377                 .proc_handler   = proc_dointvec
378         },
379         {
380                 .procname       = "inet_peer_threshold",
381                 .data           = &inet_peer_threshold,
382                 .maxlen         = sizeof(int),
383                 .mode           = 0644,
384                 .proc_handler   = proc_dointvec
385         },
386         {
387                 .procname       = "inet_peer_minttl",
388                 .data           = &inet_peer_minttl,
389                 .maxlen         = sizeof(int),
390                 .mode           = 0644,
391                 .proc_handler   = proc_dointvec_jiffies,
392         },
393         {
394                 .procname       = "inet_peer_maxttl",
395                 .data           = &inet_peer_maxttl,
396                 .maxlen         = sizeof(int),
397                 .mode           = 0644,
398                 .proc_handler   = proc_dointvec_jiffies,
399         },
400         {
401                 .procname       = "inet_peer_gc_mintime",
402                 .data           = &inet_peer_gc_mintime,
403                 .maxlen         = sizeof(int),
404                 .mode           = 0644,
405                 .proc_handler   = proc_dointvec_jiffies,
406         },
407         {
408                 .procname       = "inet_peer_gc_maxtime",
409                 .data           = &inet_peer_gc_maxtime,
410                 .maxlen         = sizeof(int),
411                 .mode           = 0644,
412                 .proc_handler   = proc_dointvec_jiffies,
413         },
414         {
415                 .procname       = "tcp_orphan_retries",
416                 .data           = &sysctl_tcp_orphan_retries,
417                 .maxlen         = sizeof(int),
418                 .mode           = 0644,
419                 .proc_handler   = proc_dointvec
420         },
421         {
422                 .procname       = "tcp_fack",
423                 .data           = &sysctl_tcp_fack,
424                 .maxlen         = sizeof(int),
425                 .mode           = 0644,
426                 .proc_handler   = proc_dointvec
427         },
428         {
429                 .procname       = "tcp_reordering",
430                 .data           = &sysctl_tcp_reordering,
431                 .maxlen         = sizeof(int),
432                 .mode           = 0644,
433                 .proc_handler   = proc_dointvec
434         },
435         {
436                 .procname       = "tcp_ecn",
437                 .data           = &sysctl_tcp_ecn,
438                 .maxlen         = sizeof(int),
439                 .mode           = 0644,
440                 .proc_handler   = proc_dointvec
441         },
442         {
443                 .procname       = "tcp_dsack",
444                 .data           = &sysctl_tcp_dsack,
445                 .maxlen         = sizeof(int),
446                 .mode           = 0644,
447                 .proc_handler   = proc_dointvec
448         },
449         {
450                 .procname       = "tcp_mem",
451                 .data           = &sysctl_tcp_mem,
452                 .maxlen         = sizeof(sysctl_tcp_mem),
453                 .mode           = 0644,
454                 .proc_handler   = proc_doulongvec_minmax
455         },
456         {
457                 .procname       = "tcp_wmem",
458                 .data           = &sysctl_tcp_wmem,
459                 .maxlen         = sizeof(sysctl_tcp_wmem),
460                 .mode           = 0644,
461                 .proc_handler   = proc_dointvec
462         },
463         {
464                 .procname       = "tcp_rmem",
465                 .data           = &sysctl_tcp_rmem,
466                 .maxlen         = sizeof(sysctl_tcp_rmem),
467                 .mode           = 0644,
468                 .proc_handler   = proc_dointvec
469         },
470         {
471                 .procname       = "tcp_app_win",
472                 .data           = &sysctl_tcp_app_win,
473                 .maxlen         = sizeof(int),
474                 .mode           = 0644,
475                 .proc_handler   = proc_dointvec
476         },
477         {
478                 .procname       = "tcp_adv_win_scale",
479                 .data           = &sysctl_tcp_adv_win_scale,
480                 .maxlen         = sizeof(int),
481                 .mode           = 0644,
482                 .proc_handler   = proc_dointvec_minmax,
483                 .extra1         = &tcp_adv_win_scale_min,
484                 .extra2         = &tcp_adv_win_scale_max,
485         },
486         {
487                 .procname       = "tcp_tw_reuse",
488                 .data           = &sysctl_tcp_tw_reuse,
489                 .maxlen         = sizeof(int),
490                 .mode           = 0644,
491                 .proc_handler   = proc_dointvec
492         },
493         {
494                 .procname       = "tcp_frto",
495                 .data           = &sysctl_tcp_frto,
496                 .maxlen         = sizeof(int),
497                 .mode           = 0644,
498                 .proc_handler   = proc_dointvec
499         },
500         {
501                 .procname       = "tcp_frto_response",
502                 .data           = &sysctl_tcp_frto_response,
503                 .maxlen         = sizeof(int),
504                 .mode           = 0644,
505                 .proc_handler   = proc_dointvec
506         },
507         {
508                 .procname       = "tcp_low_latency",
509                 .data           = &sysctl_tcp_low_latency,
510                 .maxlen         = sizeof(int),
511                 .mode           = 0644,
512                 .proc_handler   = proc_dointvec
513         },
514         {
515                 .procname       = "tcp_no_metrics_save",
516                 .data           = &sysctl_tcp_nometrics_save,
517                 .maxlen         = sizeof(int),
518                 .mode           = 0644,
519                 .proc_handler   = proc_dointvec,
520         },
521         {
522                 .procname       = "tcp_moderate_rcvbuf",
523                 .data           = &sysctl_tcp_moderate_rcvbuf,
524                 .maxlen         = sizeof(int),
525                 .mode           = 0644,
526                 .proc_handler   = proc_dointvec,
527         },
528         {
529                 .procname       = "tcp_tso_win_divisor",
530                 .data           = &sysctl_tcp_tso_win_divisor,
531                 .maxlen         = sizeof(int),
532                 .mode           = 0644,
533                 .proc_handler   = proc_dointvec,
534         },
535         {
536                 .procname       = "tcp_congestion_control",
537                 .mode           = 0644,
538                 .maxlen         = TCP_CA_NAME_MAX,
539                 .proc_handler   = proc_tcp_congestion_control,
540         },
541         {
542                 .procname       = "tcp_abc",
543                 .data           = &sysctl_tcp_abc,
544                 .maxlen         = sizeof(int),
545                 .mode           = 0644,
546                 .proc_handler   = proc_dointvec,
547         },
548         {
549                 .procname       = "tcp_mtu_probing",
550                 .data           = &sysctl_tcp_mtu_probing,
551                 .maxlen         = sizeof(int),
552                 .mode           = 0644,
553                 .proc_handler   = proc_dointvec,
554         },
555         {
556                 .procname       = "tcp_base_mss",
557                 .data           = &sysctl_tcp_base_mss,
558                 .maxlen         = sizeof(int),
559                 .mode           = 0644,
560                 .proc_handler   = proc_dointvec,
561         },
562         {
563                 .procname       = "tcp_workaround_signed_windows",
564                 .data           = &sysctl_tcp_workaround_signed_windows,
565                 .maxlen         = sizeof(int),
566                 .mode           = 0644,
567                 .proc_handler   = proc_dointvec
568         },
569 #ifdef CONFIG_NET_DMA
570         {
571                 .procname       = "tcp_dma_copybreak",
572                 .data           = &sysctl_tcp_dma_copybreak,
573                 .maxlen         = sizeof(int),
574                 .mode           = 0644,
575                 .proc_handler   = proc_dointvec
576         },
577 #endif
578         {
579                 .procname       = "tcp_slow_start_after_idle",
580                 .data           = &sysctl_tcp_slow_start_after_idle,
581                 .maxlen         = sizeof(int),
582                 .mode           = 0644,
583                 .proc_handler   = proc_dointvec
584         },
585 #ifdef CONFIG_NETLABEL
586         {
587                 .procname       = "cipso_cache_enable",
588                 .data           = &cipso_v4_cache_enabled,
589                 .maxlen         = sizeof(int),
590                 .mode           = 0644,
591                 .proc_handler   = proc_dointvec,
592         },
593         {
594                 .procname       = "cipso_cache_bucket_size",
595                 .data           = &cipso_v4_cache_bucketsize,
596                 .maxlen         = sizeof(int),
597                 .mode           = 0644,
598                 .proc_handler   = proc_dointvec,
599         },
600         {
601                 .procname       = "cipso_rbm_optfmt",
602                 .data           = &cipso_v4_rbm_optfmt,
603                 .maxlen         = sizeof(int),
604                 .mode           = 0644,
605                 .proc_handler   = proc_dointvec,
606         },
607         {
608                 .procname       = "cipso_rbm_strictvalid",
609                 .data           = &cipso_v4_rbm_strictvalid,
610                 .maxlen         = sizeof(int),
611                 .mode           = 0644,
612                 .proc_handler   = proc_dointvec,
613         },
614 #endif /* CONFIG_NETLABEL */
615         {
616                 .procname       = "tcp_available_congestion_control",
617                 .maxlen         = TCP_CA_BUF_MAX,
618                 .mode           = 0444,
619                 .proc_handler   = proc_tcp_available_congestion_control,
620         },
621         {
622                 .procname       = "tcp_allowed_congestion_control",
623                 .maxlen         = TCP_CA_BUF_MAX,
624                 .mode           = 0644,
625                 .proc_handler   = proc_allowed_congestion_control,
626         },
627         {
628                 .procname       = "tcp_max_ssthresh",
629                 .data           = &sysctl_tcp_max_ssthresh,
630                 .maxlen         = sizeof(int),
631                 .mode           = 0644,
632                 .proc_handler   = proc_dointvec,
633         },
634         {
635                 .procname       = "tcp_cookie_size",
636                 .data           = &sysctl_tcp_cookie_size,
637                 .maxlen         = sizeof(int),
638                 .mode           = 0644,
639                 .proc_handler   = proc_dointvec
640         },
641         {
642                 .procname       = "tcp_thin_linear_timeouts",
643                 .data           = &sysctl_tcp_thin_linear_timeouts,
644                 .maxlen         = sizeof(int),
645                 .mode           = 0644,
646                 .proc_handler   = proc_dointvec
647         },
648         {
649                 .procname       = "tcp_thin_dupack",
650                 .data           = &sysctl_tcp_thin_dupack,
651                 .maxlen         = sizeof(int),
652                 .mode           = 0644,
653                 .proc_handler   = proc_dointvec
654         },
655         {
656                 .procname       = "udp_mem",
657                 .data           = &sysctl_udp_mem,
658                 .maxlen         = sizeof(sysctl_udp_mem),
659                 .mode           = 0644,
660                 .proc_handler   = proc_doulongvec_minmax,
661         },
662         {
663                 .procname       = "udp_rmem_min",
664                 .data           = &sysctl_udp_rmem_min,
665                 .maxlen         = sizeof(sysctl_udp_rmem_min),
666                 .mode           = 0644,
667                 .proc_handler   = proc_dointvec_minmax,
668                 .extra1         = &zero
669         },
670         {
671                 .procname       = "udp_wmem_min",
672                 .data           = &sysctl_udp_wmem_min,
673                 .maxlen         = sizeof(sysctl_udp_wmem_min),
674                 .mode           = 0644,
675                 .proc_handler   = proc_dointvec_minmax,
676                 .extra1         = &zero
677         },
678         { }
679 };
680
681 static struct ctl_table ipv4_net_table[] = {
682         {
683                 .procname       = "icmp_echo_ignore_all",
684                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
685                 .maxlen         = sizeof(int),
686                 .mode           = 0644,
687                 .proc_handler   = proc_dointvec
688         },
689         {
690                 .procname       = "icmp_echo_ignore_broadcasts",
691                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
692                 .maxlen         = sizeof(int),
693                 .mode           = 0644,
694                 .proc_handler   = proc_dointvec
695         },
696         {
697                 .procname       = "icmp_ignore_bogus_error_responses",
698                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
699                 .maxlen         = sizeof(int),
700                 .mode           = 0644,
701                 .proc_handler   = proc_dointvec
702         },
703         {
704                 .procname       = "icmp_errors_use_inbound_ifaddr",
705                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
706                 .maxlen         = sizeof(int),
707                 .mode           = 0644,
708                 .proc_handler   = proc_dointvec
709         },
710         {
711                 .procname       = "icmp_ratelimit",
712                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
713                 .maxlen         = sizeof(int),
714                 .mode           = 0644,
715                 .proc_handler   = proc_dointvec_ms_jiffies,
716         },
717         {
718                 .procname       = "icmp_ratemask",
719                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
720                 .maxlen         = sizeof(int),
721                 .mode           = 0644,
722                 .proc_handler   = proc_dointvec
723         },
724         {
725                 .procname       = "rt_cache_rebuild_count",
726                 .data           = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
727                 .maxlen         = sizeof(int),
728                 .mode           = 0644,
729                 .proc_handler   = proc_dointvec
730         },
731         {
732                 .procname       = "ping_group_range",
733                 .data           = &init_net.ipv4.sysctl_ping_group_range,
734                 .maxlen         = sizeof(init_net.ipv4.sysctl_ping_group_range),
735                 .mode           = 0644,
736                 .proc_handler   = ipv4_ping_group_range,
737         },
738         { }
739 };
740
741 struct ctl_path net_ipv4_ctl_path[] = {
742         { .procname = "net", },
743         { .procname = "ipv4", },
744         { },
745 };
746 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
747
748 static __net_init int ipv4_sysctl_init_net(struct net *net)
749 {
750         struct ctl_table *table;
751
752         table = ipv4_net_table;
753         if (!net_eq(net, &init_net)) {
754                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
755                 if (table == NULL)
756                         goto err_alloc;
757
758                 table[0].data =
759                         &net->ipv4.sysctl_icmp_echo_ignore_all;
760                 table[1].data =
761                         &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
762                 table[2].data =
763                         &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
764                 table[3].data =
765                         &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
766                 table[4].data =
767                         &net->ipv4.sysctl_icmp_ratelimit;
768                 table[5].data =
769                         &net->ipv4.sysctl_icmp_ratemask;
770                 table[6].data =
771                         &net->ipv4.sysctl_rt_cache_rebuild_count;
772                 table[7].data =
773                         &net->ipv4.sysctl_ping_group_range;
774
775         }
776
777         /*
778          * Sane defaults - nobody may create ping sockets.
779          * Boot scripts should set this to distro-specific group.
780          */
781         net->ipv4.sysctl_ping_group_range[0] = 1;
782         net->ipv4.sysctl_ping_group_range[1] = 0;
783
784         net->ipv4.sysctl_rt_cache_rebuild_count = 4;
785
786         net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
787                         net_ipv4_ctl_path, table);
788         if (net->ipv4.ipv4_hdr == NULL)
789                 goto err_reg;
790
791         return 0;
792
793 err_reg:
794         if (!net_eq(net, &init_net))
795                 kfree(table);
796 err_alloc:
797         return -ENOMEM;
798 }
799
800 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
801 {
802         struct ctl_table *table;
803
804         table = net->ipv4.ipv4_hdr->ctl_table_arg;
805         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
806         kfree(table);
807 }
808
809 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
810         .init = ipv4_sysctl_init_net,
811         .exit = ipv4_sysctl_exit_net,
812 };
813
814 static __init int sysctl_ipv4_init(void)
815 {
816         struct ctl_table_header *hdr;
817         struct ctl_table *i;
818
819         for (i = ipv4_table; i->procname; i++) {
820                 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
821                         i->data = sysctl_local_reserved_ports;
822                         break;
823                 }
824         }
825         if (!i->procname)
826                 return -EINVAL;
827
828         hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
829         if (hdr == NULL)
830                 return -ENOMEM;
831
832         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
833                 unregister_sysctl_table(hdr);
834                 return -ENOMEM;
835         }
836
837         return 0;
838 }
839
840 __initcall(sysctl_ipv4_init);