1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
4 *
5 * Begun April 1, 1996, Mike Shaver.
6 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
7 */
8
9 #include <linux/sysctl.h>
10 #include <linux/seqlock.h>
11 #include <linux/init.h>
12 #include <linux/slab.h>
13 #include <net/icmp.h>
14 #include <net/ip.h>
15 #include <net/ip_fib.h>
16 #include <net/tcp.h>
17 #include <net/udp.h>
18 #include <net/cipso_ipv4.h>
19 #include <net/ping.h>
20 #include <net/protocol.h>
21 #include <net/netevent.h>
22
23 static int tcp_retr1_max = 255;
24 static int ip_local_port_range_min[] = { 1, 1 };
25 static int ip_local_port_range_max[] = { 65535, 65535 };
26 static int tcp_adv_win_scale_min = -31;
27 static int tcp_adv_win_scale_max = 31;
28 static int tcp_app_win_max = 31;
29 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
30 static int tcp_min_snd_mss_max = 65535;
31 static int ip_privileged_port_min;
32 static int ip_privileged_port_max = 65535;
33 static int ip_ttl_min = 1;
34 static int ip_ttl_max = 255;
35 static int tcp_syn_retries_min = 1;
36 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
37 static int tcp_syn_linear_timeouts_max = MAX_TCP_SYNCNT;
38 static unsigned long ip_ping_group_range_min[] = { 0, 0 };
39 static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
40 static u32 u32_max_div_HZ = UINT_MAX / HZ;
41 static int one_day_secs = 24 * 3600;
42 static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
43 FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
44 static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024;
45 static unsigned int udp_child_hash_entries_max = UDP_HTABLE_SIZE_MAX;
46 static int tcp_plb_max_rounds = 31;
47 static int tcp_plb_max_cong_thresh = 256;
48
49 /* obsolete */
50 static int sysctl_tcp_low_latency __read_mostly;
51
52 /* Update system visible IP port range */
set_local_port_range(struct net * net,unsigned int low,unsigned int high)53 static void set_local_port_range(struct net *net, unsigned int low, unsigned int high)
54 {
55 bool same_parity = !((low ^ high) & 1);
56
57 if (same_parity && !net->ipv4.ip_local_ports.warned) {
58 net->ipv4.ip_local_ports.warned = true;
59 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
60 }
61 WRITE_ONCE(net->ipv4.ip_local_ports.range, high << 16 | low);
62 }
63
64 /* Validate changes from /proc interface. */
ipv4_local_port_range(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)65 static int ipv4_local_port_range(const struct ctl_table *table, int write,
66 void *buffer, size_t *lenp, loff_t *ppos)
67 {
68 struct net *net = table->data;
69 int ret;
70 int range[2];
71 struct ctl_table tmp = {
72 .data = &range,
73 .maxlen = sizeof(range),
74 .mode = table->mode,
75 .extra1 = &ip_local_port_range_min,
76 .extra2 = &ip_local_port_range_max,
77 };
78
79 inet_get_local_port_range(net, &range[0], &range[1]);
80
81 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
82
83 if (write && ret == 0) {
84 /* Ensure that the upper limit is not smaller than the lower,
85 * and that the lower does not encroach upon the privileged
86 * port limit.
87 */
88 if ((range[1] < range[0]) ||
89 (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
90 ret = -EINVAL;
91 else
92 set_local_port_range(net, range[0], range[1]);
93 }
94
95 return ret;
96 }
97
98 /* Validate changes from /proc interface. */
ipv4_privileged_ports(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)99 static int ipv4_privileged_ports(const struct ctl_table *table, int write,
100 void *buffer, size_t *lenp, loff_t *ppos)
101 {
102 struct net *net = container_of(table->data, struct net,
103 ipv4.sysctl_ip_prot_sock);
104 int ret;
105 int pports;
106 int range[2];
107 struct ctl_table tmp = {
108 .data = &pports,
109 .maxlen = sizeof(pports),
110 .mode = table->mode,
111 .extra1 = &ip_privileged_port_min,
112 .extra2 = &ip_privileged_port_max,
113 };
114
115 pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
116
117 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
118
119 if (write && ret == 0) {
120 inet_get_local_port_range(net, &range[0], &range[1]);
121 /* Ensure that the local port range doesn't overlap with the
122 * privileged port range.
123 */
124 if (range[0] < pports)
125 ret = -EINVAL;
126 else
127 WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
128 }
129
130 return ret;
131 }
132
inet_get_ping_group_range_table(const struct ctl_table * table,kgid_t * low,kgid_t * high)133 static void inet_get_ping_group_range_table(const struct ctl_table *table,
134 kgid_t *low, kgid_t *high)
135 {
136 kgid_t *data = table->data;
137 struct net *net =
138 container_of(table->data, struct net, ipv4.ping_group_range.range);
139 unsigned int seq;
140 do {
141 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
142
143 *low = data[0];
144 *high = data[1];
145 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
146 }
147
148 /* Update system visible IP port range */
set_ping_group_range(const struct ctl_table * table,kgid_t low,kgid_t high)149 static void set_ping_group_range(const struct ctl_table *table,
150 kgid_t low, kgid_t high)
151 {
152 kgid_t *data = table->data;
153 struct net *net =
154 container_of(table->data, struct net, ipv4.ping_group_range.range);
155 write_seqlock(&net->ipv4.ping_group_range.lock);
156 data[0] = low;
157 data[1] = high;
158 write_sequnlock(&net->ipv4.ping_group_range.lock);
159 }
160
161 /* Validate changes from /proc interface. */
ipv4_ping_group_range(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)162 static int ipv4_ping_group_range(const struct ctl_table *table, int write,
163 void *buffer, size_t *lenp, loff_t *ppos)
164 {
165 struct user_namespace *user_ns = current_user_ns();
166 int ret;
167 unsigned long urange[2];
168 kgid_t low, high;
169 struct ctl_table tmp = {
170 .data = &urange,
171 .maxlen = sizeof(urange),
172 .mode = table->mode,
173 .extra1 = &ip_ping_group_range_min,
174 .extra2 = &ip_ping_group_range_max,
175 };
176
177 inet_get_ping_group_range_table(table, &low, &high);
178 urange[0] = from_kgid_munged(user_ns, low);
179 urange[1] = from_kgid_munged(user_ns, high);
180 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
181
182 if (write && ret == 0) {
183 low = make_kgid(user_ns, urange[0]);
184 high = make_kgid(user_ns, urange[1]);
185 if (!gid_valid(low) || !gid_valid(high))
186 return -EINVAL;
187 if (urange[1] < urange[0] || gid_lt(high, low)) {
188 low = make_kgid(&init_user_ns, 1);
189 high = make_kgid(&init_user_ns, 0);
190 }
191 set_ping_group_range(table, low, high);
192 }
193
194 return ret;
195 }
196
ipv4_fwd_update_priority(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)197 static int ipv4_fwd_update_priority(const struct ctl_table *table, int write,
198 void *buffer, size_t *lenp, loff_t *ppos)
199 {
200 struct net *net;
201 int ret;
202
203 net = container_of(table->data, struct net,
204 ipv4.sysctl_ip_fwd_update_priority);
205 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
206 if (write && ret == 0)
207 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
208 net);
209
210 return ret;
211 }
212
proc_tcp_congestion_control(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)213 static int proc_tcp_congestion_control(const struct ctl_table *ctl, int write,
214 void *buffer, size_t *lenp, loff_t *ppos)
215 {
216 struct net *net = container_of(ctl->data, struct net,
217 ipv4.tcp_congestion_control);
218 char val[TCP_CA_NAME_MAX];
219 struct ctl_table tbl = {
220 .data = val,
221 .maxlen = TCP_CA_NAME_MAX,
222 };
223 int ret;
224
225 tcp_get_default_congestion_control(net, val);
226
227 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
228 if (write && ret == 0)
229 ret = tcp_set_default_congestion_control(net, val);
230 return ret;
231 }
232
proc_tcp_available_congestion_control(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)233 static int proc_tcp_available_congestion_control(const struct ctl_table *ctl,
234 int write, void *buffer,
235 size_t *lenp, loff_t *ppos)
236 {
237 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
238 int ret;
239
240 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
241 if (!tbl.data)
242 return -ENOMEM;
243 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
244 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
245 kfree(tbl.data);
246 return ret;
247 }
248
proc_allowed_congestion_control(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)249 static int proc_allowed_congestion_control(const struct ctl_table *ctl,
250 int write, void *buffer,
251 size_t *lenp, loff_t *ppos)
252 {
253 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
254 int ret;
255
256 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
257 if (!tbl.data)
258 return -ENOMEM;
259
260 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
261 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
262 if (write && ret == 0)
263 ret = tcp_set_allowed_congestion_control(tbl.data);
264 kfree(tbl.data);
265 return ret;
266 }
267
sscanf_key(char * buf,__le32 * key)268 static int sscanf_key(char *buf, __le32 *key)
269 {
270 u32 user_key[4];
271 int i, ret = 0;
272
273 if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
274 user_key + 2, user_key + 3) != 4) {
275 ret = -EINVAL;
276 } else {
277 for (i = 0; i < ARRAY_SIZE(user_key); i++)
278 key[i] = cpu_to_le32(user_key[i]);
279 }
280 pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
281 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
282
283 return ret;
284 }
285
proc_tcp_fastopen_key(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)286 static int proc_tcp_fastopen_key(const struct ctl_table *table, int write,
287 void *buffer, size_t *lenp, loff_t *ppos)
288 {
289 struct net *net = container_of(table->data, struct net,
290 ipv4.sysctl_tcp_fastopen);
291 /* maxlen to print the list of keys in hex (*2), with dashes
292 * separating doublewords and a comma in between keys.
293 */
294 struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
295 2 * TCP_FASTOPEN_KEY_MAX) +
296 (TCP_FASTOPEN_KEY_MAX * 5)) };
297 u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
298 __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
299 char *backup_data;
300 int ret, i = 0, off = 0, n_keys;
301
302 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
303 if (!tbl.data)
304 return -ENOMEM;
305
306 n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
307 if (!n_keys) {
308 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
309 n_keys = 1;
310 }
311
312 for (i = 0; i < n_keys * 4; i++)
313 user_key[i] = le32_to_cpu(key[i]);
314
315 for (i = 0; i < n_keys; i++) {
316 off += snprintf(tbl.data + off, tbl.maxlen - off,
317 "%08x-%08x-%08x-%08x",
318 user_key[i * 4],
319 user_key[i * 4 + 1],
320 user_key[i * 4 + 2],
321 user_key[i * 4 + 3]);
322
323 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
324 break;
325
326 if (i + 1 < n_keys)
327 off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
328 }
329
330 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
331
332 if (write && ret == 0) {
333 backup_data = strchr(tbl.data, ',');
334 if (backup_data) {
335 *backup_data = '\0';
336 backup_data++;
337 }
338 if (sscanf_key(tbl.data, key)) {
339 ret = -EINVAL;
340 goto bad_key;
341 }
342 if (backup_data) {
343 if (sscanf_key(backup_data, key + 4)) {
344 ret = -EINVAL;
345 goto bad_key;
346 }
347 }
348 tcp_fastopen_reset_cipher(net, NULL, key,
349 backup_data ? key + 4 : NULL);
350 }
351
352 bad_key:
353 kfree(tbl.data);
354 return ret;
355 }
356
proc_tfo_blackhole_detect_timeout(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)357 static int proc_tfo_blackhole_detect_timeout(const struct ctl_table *table,
358 int write, void *buffer,
359 size_t *lenp, loff_t *ppos)
360 {
361 struct net *net = container_of(table->data, struct net,
362 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
363 int ret;
364
365 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
366 if (write && ret == 0)
367 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
368
369 return ret;
370 }
371
proc_tcp_available_ulp(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)372 static int proc_tcp_available_ulp(const struct ctl_table *ctl,
373 int write, void *buffer, size_t *lenp,
374 loff_t *ppos)
375 {
376 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
377 int ret;
378
379 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
380 if (!tbl.data)
381 return -ENOMEM;
382 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
383 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
384 kfree(tbl.data);
385
386 return ret;
387 }
388
proc_tcp_ehash_entries(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)389 static int proc_tcp_ehash_entries(const struct ctl_table *table, int write,
390 void *buffer, size_t *lenp, loff_t *ppos)
391 {
392 struct net *net = container_of(table->data, struct net,
393 ipv4.sysctl_tcp_child_ehash_entries);
394 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo;
395 int tcp_ehash_entries;
396 struct ctl_table tbl;
397
398 tcp_ehash_entries = hinfo->ehash_mask + 1;
399
400 /* A negative number indicates that the child netns
401 * shares the global ehash.
402 */
403 if (!net_eq(net, &init_net) && !hinfo->pernet)
404 tcp_ehash_entries *= -1;
405
406 memset(&tbl, 0, sizeof(tbl));
407 tbl.data = &tcp_ehash_entries;
408 tbl.maxlen = sizeof(int);
409
410 return proc_dointvec(&tbl, write, buffer, lenp, ppos);
411 }
412
proc_udp_hash_entries(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)413 static int proc_udp_hash_entries(const struct ctl_table *table, int write,
414 void *buffer, size_t *lenp, loff_t *ppos)
415 {
416 struct net *net = container_of(table->data, struct net,
417 ipv4.sysctl_udp_child_hash_entries);
418 int udp_hash_entries;
419 struct ctl_table tbl;
420
421 udp_hash_entries = net->ipv4.udp_table->mask + 1;
422
423 /* A negative number indicates that the child netns
424 * shares the global udp_table.
425 */
426 if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table)
427 udp_hash_entries *= -1;
428
429 memset(&tbl, 0, sizeof(tbl));
430 tbl.data = &udp_hash_entries;
431 tbl.maxlen = sizeof(int);
432
433 return proc_dointvec(&tbl, write, buffer, lenp, ppos);
434 }
435
436 #ifdef CONFIG_IP_ROUTE_MULTIPATH
proc_fib_multipath_hash_policy(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)437 static int proc_fib_multipath_hash_policy(const struct ctl_table *table, int write,
438 void *buffer, size_t *lenp,
439 loff_t *ppos)
440 {
441 struct net *net = container_of(table->data, struct net,
442 ipv4.sysctl_fib_multipath_hash_policy);
443 int ret;
444
445 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
446 if (write && ret == 0)
447 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
448
449 return ret;
450 }
451
proc_fib_multipath_hash_fields(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)452 static int proc_fib_multipath_hash_fields(const struct ctl_table *table, int write,
453 void *buffer, size_t *lenp,
454 loff_t *ppos)
455 {
456 struct net *net;
457 int ret;
458
459 net = container_of(table->data, struct net,
460 ipv4.sysctl_fib_multipath_hash_fields);
461 ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
462 if (write && ret == 0)
463 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
464
465 return ret;
466 }
467
468 static u32 proc_fib_multipath_hash_rand_seed __ro_after_init;
469
proc_fib_multipath_hash_init_rand_seed(void)470 static void proc_fib_multipath_hash_init_rand_seed(void)
471 {
472 get_random_bytes(&proc_fib_multipath_hash_rand_seed,
473 sizeof(proc_fib_multipath_hash_rand_seed));
474 }
475
proc_fib_multipath_hash_set_seed(struct net * net,u32 user_seed)476 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed)
477 {
478 struct sysctl_fib_multipath_hash_seed new = {
479 .user_seed = user_seed,
480 .mp_seed = (user_seed ? user_seed :
481 proc_fib_multipath_hash_rand_seed),
482 };
483
484 WRITE_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed, new);
485 }
486
proc_fib_multipath_hash_seed(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)487 static int proc_fib_multipath_hash_seed(const struct ctl_table *table, int write,
488 void *buffer, size_t *lenp,
489 loff_t *ppos)
490 {
491 struct sysctl_fib_multipath_hash_seed *mphs;
492 struct net *net = table->data;
493 struct ctl_table tmp;
494 u32 user_seed;
495 int ret;
496
497 mphs = &net->ipv4.sysctl_fib_multipath_hash_seed;
498 user_seed = mphs->user_seed;
499
500 tmp = *table;
501 tmp.data = &user_seed;
502
503 ret = proc_douintvec_minmax(&tmp, write, buffer, lenp, ppos);
504
505 if (write && ret == 0) {
506 proc_fib_multipath_hash_set_seed(net, user_seed);
507 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
508 }
509
510 return ret;
511 }
512 #else
513
proc_fib_multipath_hash_init_rand_seed(void)514 static void proc_fib_multipath_hash_init_rand_seed(void)
515 {
516 }
517
proc_fib_multipath_hash_set_seed(struct net * net,u32 user_seed)518 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed)
519 {
520 }
521
522 #endif
523
524 static struct ctl_table ipv4_table[] = {
525 {
526 .procname = "tcp_max_orphans",
527 .data = &sysctl_tcp_max_orphans,
528 .maxlen = sizeof(int),
529 .mode = 0644,
530 .proc_handler = proc_dointvec
531 },
532 {
533 .procname = "inet_peer_threshold",
534 .data = &inet_peer_threshold,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec
538 },
539 {
540 .procname = "inet_peer_minttl",
541 .data = &inet_peer_minttl,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec_jiffies,
545 },
546 {
547 .procname = "inet_peer_maxttl",
548 .data = &inet_peer_maxttl,
549 .maxlen = sizeof(int),
550 .mode = 0644,
551 .proc_handler = proc_dointvec_jiffies,
552 },
553 {
554 .procname = "tcp_mem",
555 .maxlen = sizeof(sysctl_tcp_mem),
556 .data = &sysctl_tcp_mem,
557 .mode = 0644,
558 .proc_handler = proc_doulongvec_minmax,
559 },
560 {
561 .procname = "tcp_low_latency",
562 .data = &sysctl_tcp_low_latency,
563 .maxlen = sizeof(int),
564 .mode = 0644,
565 .proc_handler = proc_dointvec
566 },
567 #ifdef CONFIG_NETLABEL
568 {
569 .procname = "cipso_cache_enable",
570 .data = &cipso_v4_cache_enabled,
571 .maxlen = sizeof(int),
572 .mode = 0644,
573 .proc_handler = proc_dointvec,
574 },
575 {
576 .procname = "cipso_cache_bucket_size",
577 .data = &cipso_v4_cache_bucketsize,
578 .maxlen = sizeof(int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec,
581 },
582 {
583 .procname = "cipso_rbm_optfmt",
584 .data = &cipso_v4_rbm_optfmt,
585 .maxlen = sizeof(int),
586 .mode = 0644,
587 .proc_handler = proc_dointvec,
588 },
589 {
590 .procname = "cipso_rbm_strictvalid",
591 .data = &cipso_v4_rbm_strictvalid,
592 .maxlen = sizeof(int),
593 .mode = 0644,
594 .proc_handler = proc_dointvec,
595 },
596 #endif /* CONFIG_NETLABEL */
597 {
598 .procname = "tcp_available_ulp",
599 .maxlen = TCP_ULP_BUF_MAX,
600 .mode = 0444,
601 .proc_handler = proc_tcp_available_ulp,
602 },
603 {
604 .procname = "udp_mem",
605 .data = &sysctl_udp_mem,
606 .maxlen = sizeof(sysctl_udp_mem),
607 .mode = 0644,
608 .proc_handler = proc_doulongvec_minmax,
609 },
610 {
611 .procname = "fib_sync_mem",
612 .data = &sysctl_fib_sync_mem,
613 .maxlen = sizeof(sysctl_fib_sync_mem),
614 .mode = 0644,
615 .proc_handler = proc_douintvec_minmax,
616 .extra1 = &sysctl_fib_sync_mem_min,
617 .extra2 = &sysctl_fib_sync_mem_max,
618 },
619 };
620
621 static struct ctl_table ipv4_net_table[] = {
622 {
623 .procname = "tcp_max_tw_buckets",
624 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
625 .maxlen = sizeof(int),
626 .mode = 0644,
627 .proc_handler = proc_dointvec
628 },
629 {
630 .procname = "icmp_echo_ignore_all",
631 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
632 .maxlen = sizeof(u8),
633 .mode = 0644,
634 .proc_handler = proc_dou8vec_minmax,
635 .extra1 = SYSCTL_ZERO,
636 .extra2 = SYSCTL_ONE
637 },
638 {
639 .procname = "icmp_echo_enable_probe",
640 .data = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
641 .maxlen = sizeof(u8),
642 .mode = 0644,
643 .proc_handler = proc_dou8vec_minmax,
644 .extra1 = SYSCTL_ZERO,
645 .extra2 = SYSCTL_ONE
646 },
647 {
648 .procname = "icmp_echo_ignore_broadcasts",
649 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
650 .maxlen = sizeof(u8),
651 .mode = 0644,
652 .proc_handler = proc_dou8vec_minmax,
653 .extra1 = SYSCTL_ZERO,
654 .extra2 = SYSCTL_ONE
655 },
656 {
657 .procname = "icmp_ignore_bogus_error_responses",
658 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
659 .maxlen = sizeof(u8),
660 .mode = 0644,
661 .proc_handler = proc_dou8vec_minmax,
662 .extra1 = SYSCTL_ZERO,
663 .extra2 = SYSCTL_ONE
664 },
665 {
666 .procname = "icmp_errors_use_inbound_ifaddr",
667 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
668 .maxlen = sizeof(u8),
669 .mode = 0644,
670 .proc_handler = proc_dou8vec_minmax,
671 .extra1 = SYSCTL_ZERO,
672 .extra2 = SYSCTL_ONE
673 },
674 {
675 .procname = "icmp_ratelimit",
676 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
677 .maxlen = sizeof(int),
678 .mode = 0644,
679 .proc_handler = proc_dointvec_ms_jiffies,
680 },
681 {
682 .procname = "icmp_ratemask",
683 .data = &init_net.ipv4.sysctl_icmp_ratemask,
684 .maxlen = sizeof(int),
685 .mode = 0644,
686 .proc_handler = proc_dointvec
687 },
688 {
689 .procname = "icmp_msgs_per_sec",
690 .data = &init_net.ipv4.sysctl_icmp_msgs_per_sec,
691 .maxlen = sizeof(int),
692 .mode = 0644,
693 .proc_handler = proc_dointvec_minmax,
694 .extra1 = SYSCTL_ZERO,
695 },
696 {
697 .procname = "icmp_msgs_burst",
698 .data = &init_net.ipv4.sysctl_icmp_msgs_burst,
699 .maxlen = sizeof(int),
700 .mode = 0644,
701 .proc_handler = proc_dointvec_minmax,
702 .extra1 = SYSCTL_ZERO,
703 },
704 {
705 .procname = "ping_group_range",
706 .data = &init_net.ipv4.ping_group_range.range,
707 .maxlen = sizeof(gid_t)*2,
708 .mode = 0644,
709 .proc_handler = ipv4_ping_group_range,
710 },
711 #ifdef CONFIG_NET_L3_MASTER_DEV
712 {
713 .procname = "raw_l3mdev_accept",
714 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept,
715 .maxlen = sizeof(u8),
716 .mode = 0644,
717 .proc_handler = proc_dou8vec_minmax,
718 .extra1 = SYSCTL_ZERO,
719 .extra2 = SYSCTL_ONE,
720 },
721 #endif
722 {
723 .procname = "tcp_ecn",
724 .data = &init_net.ipv4.sysctl_tcp_ecn,
725 .maxlen = sizeof(u8),
726 .mode = 0644,
727 .proc_handler = proc_dou8vec_minmax,
728 .extra1 = SYSCTL_ZERO,
729 .extra2 = SYSCTL_TWO,
730 },
731 {
732 .procname = "tcp_ecn_fallback",
733 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
734 .maxlen = sizeof(u8),
735 .mode = 0644,
736 .proc_handler = proc_dou8vec_minmax,
737 .extra1 = SYSCTL_ZERO,
738 .extra2 = SYSCTL_ONE,
739 },
740 {
741 .procname = "ip_dynaddr",
742 .data = &init_net.ipv4.sysctl_ip_dynaddr,
743 .maxlen = sizeof(u8),
744 .mode = 0644,
745 .proc_handler = proc_dou8vec_minmax,
746 },
747 {
748 .procname = "ip_early_demux",
749 .data = &init_net.ipv4.sysctl_ip_early_demux,
750 .maxlen = sizeof(u8),
751 .mode = 0644,
752 .proc_handler = proc_dou8vec_minmax,
753 },
754 {
755 .procname = "udp_early_demux",
756 .data = &init_net.ipv4.sysctl_udp_early_demux,
757 .maxlen = sizeof(u8),
758 .mode = 0644,
759 .proc_handler = proc_dou8vec_minmax,
760 },
761 {
762 .procname = "tcp_early_demux",
763 .data = &init_net.ipv4.sysctl_tcp_early_demux,
764 .maxlen = sizeof(u8),
765 .mode = 0644,
766 .proc_handler = proc_dou8vec_minmax,
767 },
768 {
769 .procname = "nexthop_compat_mode",
770 .data = &init_net.ipv4.sysctl_nexthop_compat_mode,
771 .maxlen = sizeof(u8),
772 .mode = 0644,
773 .proc_handler = proc_dou8vec_minmax,
774 .extra1 = SYSCTL_ZERO,
775 .extra2 = SYSCTL_ONE,
776 },
777 {
778 .procname = "ip_default_ttl",
779 .data = &init_net.ipv4.sysctl_ip_default_ttl,
780 .maxlen = sizeof(u8),
781 .mode = 0644,
782 .proc_handler = proc_dou8vec_minmax,
783 .extra1 = &ip_ttl_min,
784 .extra2 = &ip_ttl_max,
785 },
786 {
787 .procname = "ip_local_port_range",
788 .maxlen = 0,
789 .data = &init_net,
790 .mode = 0644,
791 .proc_handler = ipv4_local_port_range,
792 },
793 {
794 .procname = "ip_local_reserved_ports",
795 .data = &init_net.ipv4.sysctl_local_reserved_ports,
796 .maxlen = 65536,
797 .mode = 0644,
798 .proc_handler = proc_do_large_bitmap,
799 },
800 {
801 .procname = "ip_no_pmtu_disc",
802 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
803 .maxlen = sizeof(u8),
804 .mode = 0644,
805 .proc_handler = proc_dou8vec_minmax,
806 },
807 {
808 .procname = "ip_forward_use_pmtu",
809 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
810 .maxlen = sizeof(u8),
811 .mode = 0644,
812 .proc_handler = proc_dou8vec_minmax,
813 },
814 {
815 .procname = "ip_forward_update_priority",
816 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
817 .maxlen = sizeof(u8),
818 .mode = 0644,
819 .proc_handler = ipv4_fwd_update_priority,
820 .extra1 = SYSCTL_ZERO,
821 .extra2 = SYSCTL_ONE,
822 },
823 {
824 .procname = "ip_nonlocal_bind",
825 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
826 .maxlen = sizeof(u8),
827 .mode = 0644,
828 .proc_handler = proc_dou8vec_minmax,
829 },
830 {
831 .procname = "ip_autobind_reuse",
832 .data = &init_net.ipv4.sysctl_ip_autobind_reuse,
833 .maxlen = sizeof(u8),
834 .mode = 0644,
835 .proc_handler = proc_dou8vec_minmax,
836 .extra1 = SYSCTL_ZERO,
837 .extra2 = SYSCTL_ONE,
838 },
839 {
840 .procname = "fwmark_reflect",
841 .data = &init_net.ipv4.sysctl_fwmark_reflect,
842 .maxlen = sizeof(u8),
843 .mode = 0644,
844 .proc_handler = proc_dou8vec_minmax,
845 },
846 {
847 .procname = "tcp_fwmark_accept",
848 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
849 .maxlen = sizeof(u8),
850 .mode = 0644,
851 .proc_handler = proc_dou8vec_minmax,
852 },
853 #ifdef CONFIG_NET_L3_MASTER_DEV
854 {
855 .procname = "tcp_l3mdev_accept",
856 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
857 .maxlen = sizeof(u8),
858 .mode = 0644,
859 .proc_handler = proc_dou8vec_minmax,
860 .extra1 = SYSCTL_ZERO,
861 .extra2 = SYSCTL_ONE,
862 },
863 #endif
864 {
865 .procname = "tcp_mtu_probing",
866 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
867 .maxlen = sizeof(u8),
868 .mode = 0644,
869 .proc_handler = proc_dou8vec_minmax,
870 },
871 {
872 .procname = "tcp_base_mss",
873 .data = &init_net.ipv4.sysctl_tcp_base_mss,
874 .maxlen = sizeof(int),
875 .mode = 0644,
876 .proc_handler = proc_dointvec,
877 },
878 {
879 .procname = "tcp_min_snd_mss",
880 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss,
881 .maxlen = sizeof(int),
882 .mode = 0644,
883 .proc_handler = proc_dointvec_minmax,
884 .extra1 = &tcp_min_snd_mss_min,
885 .extra2 = &tcp_min_snd_mss_max,
886 },
887 {
888 .procname = "tcp_mtu_probe_floor",
889 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
890 .maxlen = sizeof(int),
891 .mode = 0644,
892 .proc_handler = proc_dointvec_minmax,
893 .extra1 = &tcp_min_snd_mss_min,
894 .extra2 = &tcp_min_snd_mss_max,
895 },
896 {
897 .procname = "tcp_probe_threshold",
898 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
899 .maxlen = sizeof(int),
900 .mode = 0644,
901 .proc_handler = proc_dointvec,
902 },
903 {
904 .procname = "tcp_probe_interval",
905 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
906 .maxlen = sizeof(u32),
907 .mode = 0644,
908 .proc_handler = proc_douintvec_minmax,
909 .extra2 = &u32_max_div_HZ,
910 },
911 {
912 .procname = "igmp_link_local_mcast_reports",
913 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
914 .maxlen = sizeof(u8),
915 .mode = 0644,
916 .proc_handler = proc_dou8vec_minmax,
917 },
918 {
919 .procname = "igmp_max_memberships",
920 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
921 .maxlen = sizeof(int),
922 .mode = 0644,
923 .proc_handler = proc_dointvec
924 },
925 {
926 .procname = "igmp_max_msf",
927 .data = &init_net.ipv4.sysctl_igmp_max_msf,
928 .maxlen = sizeof(int),
929 .mode = 0644,
930 .proc_handler = proc_dointvec
931 },
932 #ifdef CONFIG_IP_MULTICAST
933 {
934 .procname = "igmp_qrv",
935 .data = &init_net.ipv4.sysctl_igmp_qrv,
936 .maxlen = sizeof(int),
937 .mode = 0644,
938 .proc_handler = proc_dointvec_minmax,
939 .extra1 = SYSCTL_ONE
940 },
941 #endif
942 {
943 .procname = "tcp_congestion_control",
944 .data = &init_net.ipv4.tcp_congestion_control,
945 .mode = 0644,
946 .maxlen = TCP_CA_NAME_MAX,
947 .proc_handler = proc_tcp_congestion_control,
948 },
949 {
950 .procname = "tcp_available_congestion_control",
951 .maxlen = TCP_CA_BUF_MAX,
952 .mode = 0444,
953 .proc_handler = proc_tcp_available_congestion_control,
954 },
955 {
956 .procname = "tcp_allowed_congestion_control",
957 .maxlen = TCP_CA_BUF_MAX,
958 .mode = 0644,
959 .proc_handler = proc_allowed_congestion_control,
960 },
961 {
962 .procname = "tcp_keepalive_time",
963 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
964 .maxlen = sizeof(int),
965 .mode = 0644,
966 .proc_handler = proc_dointvec_jiffies,
967 },
968 {
969 .procname = "tcp_keepalive_probes",
970 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
971 .maxlen = sizeof(u8),
972 .mode = 0644,
973 .proc_handler = proc_dou8vec_minmax,
974 },
975 {
976 .procname = "tcp_keepalive_intvl",
977 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
978 .maxlen = sizeof(int),
979 .mode = 0644,
980 .proc_handler = proc_dointvec_jiffies,
981 },
982 {
983 .procname = "tcp_syn_retries",
984 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
985 .maxlen = sizeof(u8),
986 .mode = 0644,
987 .proc_handler = proc_dou8vec_minmax,
988 .extra1 = &tcp_syn_retries_min,
989 .extra2 = &tcp_syn_retries_max
990 },
991 {
992 .procname = "tcp_synack_retries",
993 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
994 .maxlen = sizeof(u8),
995 .mode = 0644,
996 .proc_handler = proc_dou8vec_minmax,
997 },
998 #ifdef CONFIG_SYN_COOKIES
999 {
1000 .procname = "tcp_syncookies",
1001 .data = &init_net.ipv4.sysctl_tcp_syncookies,
1002 .maxlen = sizeof(u8),
1003 .mode = 0644,
1004 .proc_handler = proc_dou8vec_minmax,
1005 },
1006 #endif
1007 {
1008 .procname = "tcp_migrate_req",
1009 .data = &init_net.ipv4.sysctl_tcp_migrate_req,
1010 .maxlen = sizeof(u8),
1011 .mode = 0644,
1012 .proc_handler = proc_dou8vec_minmax,
1013 .extra1 = SYSCTL_ZERO,
1014 .extra2 = SYSCTL_ONE
1015 },
1016 {
1017 .procname = "tcp_reordering",
1018 .data = &init_net.ipv4.sysctl_tcp_reordering,
1019 .maxlen = sizeof(int),
1020 .mode = 0644,
1021 .proc_handler = proc_dointvec
1022 },
1023 {
1024 .procname = "tcp_retries1",
1025 .data = &init_net.ipv4.sysctl_tcp_retries1,
1026 .maxlen = sizeof(u8),
1027 .mode = 0644,
1028 .proc_handler = proc_dou8vec_minmax,
1029 .extra2 = &tcp_retr1_max
1030 },
1031 {
1032 .procname = "tcp_retries2",
1033 .data = &init_net.ipv4.sysctl_tcp_retries2,
1034 .maxlen = sizeof(u8),
1035 .mode = 0644,
1036 .proc_handler = proc_dou8vec_minmax,
1037 },
1038 {
1039 .procname = "tcp_orphan_retries",
1040 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
1041 .maxlen = sizeof(u8),
1042 .mode = 0644,
1043 .proc_handler = proc_dou8vec_minmax,
1044 },
1045 {
1046 .procname = "tcp_fin_timeout",
1047 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
1048 .maxlen = sizeof(int),
1049 .mode = 0644,
1050 .proc_handler = proc_dointvec_jiffies,
1051 },
1052 {
1053 .procname = "tcp_notsent_lowat",
1054 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1055 .maxlen = sizeof(unsigned int),
1056 .mode = 0644,
1057 .proc_handler = proc_douintvec,
1058 },
1059 {
1060 .procname = "tcp_tw_reuse",
1061 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
1062 .maxlen = sizeof(u8),
1063 .mode = 0644,
1064 .proc_handler = proc_dou8vec_minmax,
1065 .extra1 = SYSCTL_ZERO,
1066 .extra2 = SYSCTL_TWO,
1067 },
1068 {
1069 .procname = "tcp_max_syn_backlog",
1070 .data = &init_net.ipv4.sysctl_max_syn_backlog,
1071 .maxlen = sizeof(int),
1072 .mode = 0644,
1073 .proc_handler = proc_dointvec
1074 },
1075 {
1076 .procname = "tcp_fastopen",
1077 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1078 .maxlen = sizeof(int),
1079 .mode = 0644,
1080 .proc_handler = proc_dointvec,
1081 },
1082 {
1083 .procname = "tcp_fastopen_key",
1084 .mode = 0600,
1085 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1086 /* maxlen to print the list of keys in hex (*2), with dashes
1087 * separating doublewords and a comma in between keys.
1088 */
1089 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
1090 2 * TCP_FASTOPEN_KEY_MAX) +
1091 (TCP_FASTOPEN_KEY_MAX * 5)),
1092 .proc_handler = proc_tcp_fastopen_key,
1093 },
1094 {
1095 .procname = "tcp_fastopen_blackhole_timeout_sec",
1096 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1097 .maxlen = sizeof(int),
1098 .mode = 0644,
1099 .proc_handler = proc_tfo_blackhole_detect_timeout,
1100 .extra1 = SYSCTL_ZERO,
1101 },
1102 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1103 {
1104 .procname = "fib_multipath_use_neigh",
1105 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1106 .maxlen = sizeof(u8),
1107 .mode = 0644,
1108 .proc_handler = proc_dou8vec_minmax,
1109 .extra1 = SYSCTL_ZERO,
1110 .extra2 = SYSCTL_ONE,
1111 },
1112 {
1113 .procname = "fib_multipath_hash_policy",
1114 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1115 .maxlen = sizeof(u8),
1116 .mode = 0644,
1117 .proc_handler = proc_fib_multipath_hash_policy,
1118 .extra1 = SYSCTL_ZERO,
1119 .extra2 = SYSCTL_THREE,
1120 },
1121 {
1122 .procname = "fib_multipath_hash_fields",
1123 .data = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1124 .maxlen = sizeof(u32),
1125 .mode = 0644,
1126 .proc_handler = proc_fib_multipath_hash_fields,
1127 .extra1 = SYSCTL_ONE,
1128 .extra2 = &fib_multipath_hash_fields_all_mask,
1129 },
1130 {
1131 .procname = "fib_multipath_hash_seed",
1132 .data = &init_net,
1133 .maxlen = sizeof(u32),
1134 .mode = 0644,
1135 .proc_handler = proc_fib_multipath_hash_seed,
1136 },
1137 #endif
1138 {
1139 .procname = "ip_unprivileged_port_start",
1140 .maxlen = sizeof(int),
1141 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1142 .mode = 0644,
1143 .proc_handler = ipv4_privileged_ports,
1144 },
1145 #ifdef CONFIG_NET_L3_MASTER_DEV
1146 {
1147 .procname = "udp_l3mdev_accept",
1148 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1149 .maxlen = sizeof(u8),
1150 .mode = 0644,
1151 .proc_handler = proc_dou8vec_minmax,
1152 .extra1 = SYSCTL_ZERO,
1153 .extra2 = SYSCTL_ONE,
1154 },
1155 #endif
1156 {
1157 .procname = "tcp_sack",
1158 .data = &init_net.ipv4.sysctl_tcp_sack,
1159 .maxlen = sizeof(u8),
1160 .mode = 0644,
1161 .proc_handler = proc_dou8vec_minmax,
1162 },
1163 {
1164 .procname = "tcp_window_scaling",
1165 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
1166 .maxlen = sizeof(u8),
1167 .mode = 0644,
1168 .proc_handler = proc_dou8vec_minmax,
1169 },
1170 {
1171 .procname = "tcp_timestamps",
1172 .data = &init_net.ipv4.sysctl_tcp_timestamps,
1173 .maxlen = sizeof(u8),
1174 .mode = 0644,
1175 .proc_handler = proc_dou8vec_minmax,
1176 },
1177 {
1178 .procname = "tcp_early_retrans",
1179 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
1180 .maxlen = sizeof(u8),
1181 .mode = 0644,
1182 .proc_handler = proc_dou8vec_minmax,
1183 .extra1 = SYSCTL_ZERO,
1184 .extra2 = SYSCTL_FOUR,
1185 },
1186 {
1187 .procname = "tcp_recovery",
1188 .data = &init_net.ipv4.sysctl_tcp_recovery,
1189 .maxlen = sizeof(u8),
1190 .mode = 0644,
1191 .proc_handler = proc_dou8vec_minmax,
1192 },
1193 {
1194 .procname = "tcp_thin_linear_timeouts",
1195 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1196 .maxlen = sizeof(u8),
1197 .mode = 0644,
1198 .proc_handler = proc_dou8vec_minmax,
1199 },
1200 {
1201 .procname = "tcp_slow_start_after_idle",
1202 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1203 .maxlen = sizeof(u8),
1204 .mode = 0644,
1205 .proc_handler = proc_dou8vec_minmax,
1206 },
1207 {
1208 .procname = "tcp_retrans_collapse",
1209 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1210 .maxlen = sizeof(u8),
1211 .mode = 0644,
1212 .proc_handler = proc_dou8vec_minmax,
1213 },
1214 {
1215 .procname = "tcp_stdurg",
1216 .data = &init_net.ipv4.sysctl_tcp_stdurg,
1217 .maxlen = sizeof(u8),
1218 .mode = 0644,
1219 .proc_handler = proc_dou8vec_minmax,
1220 },
1221 {
1222 .procname = "tcp_rfc1337",
1223 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1224 .maxlen = sizeof(u8),
1225 .mode = 0644,
1226 .proc_handler = proc_dou8vec_minmax,
1227 },
1228 {
1229 .procname = "tcp_abort_on_overflow",
1230 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1231 .maxlen = sizeof(u8),
1232 .mode = 0644,
1233 .proc_handler = proc_dou8vec_minmax,
1234 },
1235 {
1236 .procname = "tcp_fack",
1237 .data = &init_net.ipv4.sysctl_tcp_fack,
1238 .maxlen = sizeof(u8),
1239 .mode = 0644,
1240 .proc_handler = proc_dou8vec_minmax,
1241 },
1242 {
1243 .procname = "tcp_max_reordering",
1244 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1245 .maxlen = sizeof(int),
1246 .mode = 0644,
1247 .proc_handler = proc_dointvec
1248 },
1249 {
1250 .procname = "tcp_dsack",
1251 .data = &init_net.ipv4.sysctl_tcp_dsack,
1252 .maxlen = sizeof(u8),
1253 .mode = 0644,
1254 .proc_handler = proc_dou8vec_minmax,
1255 },
1256 {
1257 .procname = "tcp_app_win",
1258 .data = &init_net.ipv4.sysctl_tcp_app_win,
1259 .maxlen = sizeof(u8),
1260 .mode = 0644,
1261 .proc_handler = proc_dou8vec_minmax,
1262 .extra1 = SYSCTL_ZERO,
1263 .extra2 = &tcp_app_win_max,
1264 },
1265 {
1266 .procname = "tcp_adv_win_scale",
1267 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1268 .maxlen = sizeof(int),
1269 .mode = 0644,
1270 .proc_handler = proc_dointvec_minmax,
1271 .extra1 = &tcp_adv_win_scale_min,
1272 .extra2 = &tcp_adv_win_scale_max,
1273 },
1274 {
1275 .procname = "tcp_frto",
1276 .data = &init_net.ipv4.sysctl_tcp_frto,
1277 .maxlen = sizeof(u8),
1278 .mode = 0644,
1279 .proc_handler = proc_dou8vec_minmax,
1280 },
1281 {
1282 .procname = "tcp_no_metrics_save",
1283 .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
1284 .maxlen = sizeof(u8),
1285 .mode = 0644,
1286 .proc_handler = proc_dou8vec_minmax,
1287 },
1288 {
1289 .procname = "tcp_no_ssthresh_metrics_save",
1290 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1291 .maxlen = sizeof(u8),
1292 .mode = 0644,
1293 .proc_handler = proc_dou8vec_minmax,
1294 .extra1 = SYSCTL_ZERO,
1295 .extra2 = SYSCTL_ONE,
1296 },
1297 {
1298 .procname = "tcp_moderate_rcvbuf",
1299 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1300 .maxlen = sizeof(u8),
1301 .mode = 0644,
1302 .proc_handler = proc_dou8vec_minmax,
1303 },
1304 {
1305 .procname = "tcp_tso_win_divisor",
1306 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1307 .maxlen = sizeof(u8),
1308 .mode = 0644,
1309 .proc_handler = proc_dou8vec_minmax,
1310 },
1311 {
1312 .procname = "tcp_workaround_signed_windows",
1313 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1314 .maxlen = sizeof(u8),
1315 .mode = 0644,
1316 .proc_handler = proc_dou8vec_minmax,
1317 },
1318 {
1319 .procname = "tcp_limit_output_bytes",
1320 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1321 .maxlen = sizeof(int),
1322 .mode = 0644,
1323 .proc_handler = proc_dointvec
1324 },
1325 {
1326 .procname = "tcp_challenge_ack_limit",
1327 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1328 .maxlen = sizeof(int),
1329 .mode = 0644,
1330 .proc_handler = proc_dointvec
1331 },
1332 {
1333 .procname = "tcp_min_tso_segs",
1334 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1335 .maxlen = sizeof(u8),
1336 .mode = 0644,
1337 .proc_handler = proc_dou8vec_minmax,
1338 .extra1 = SYSCTL_ONE,
1339 },
1340 {
1341 .procname = "tcp_tso_rtt_log",
1342 .data = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1343 .maxlen = sizeof(u8),
1344 .mode = 0644,
1345 .proc_handler = proc_dou8vec_minmax,
1346 },
1347 {
1348 .procname = "tcp_min_rtt_wlen",
1349 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1350 .maxlen = sizeof(int),
1351 .mode = 0644,
1352 .proc_handler = proc_dointvec_minmax,
1353 .extra1 = SYSCTL_ZERO,
1354 .extra2 = &one_day_secs
1355 },
1356 {
1357 .procname = "tcp_autocorking",
1358 .data = &init_net.ipv4.sysctl_tcp_autocorking,
1359 .maxlen = sizeof(u8),
1360 .mode = 0644,
1361 .proc_handler = proc_dou8vec_minmax,
1362 .extra1 = SYSCTL_ZERO,
1363 .extra2 = SYSCTL_ONE,
1364 },
1365 {
1366 .procname = "tcp_invalid_ratelimit",
1367 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1368 .maxlen = sizeof(int),
1369 .mode = 0644,
1370 .proc_handler = proc_dointvec_ms_jiffies,
1371 },
1372 {
1373 .procname = "tcp_pacing_ss_ratio",
1374 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1375 .maxlen = sizeof(int),
1376 .mode = 0644,
1377 .proc_handler = proc_dointvec_minmax,
1378 .extra1 = SYSCTL_ZERO,
1379 .extra2 = SYSCTL_ONE_THOUSAND,
1380 },
1381 {
1382 .procname = "tcp_pacing_ca_ratio",
1383 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1384 .maxlen = sizeof(int),
1385 .mode = 0644,
1386 .proc_handler = proc_dointvec_minmax,
1387 .extra1 = SYSCTL_ZERO,
1388 .extra2 = SYSCTL_ONE_THOUSAND,
1389 },
1390 {
1391 .procname = "tcp_wmem",
1392 .data = &init_net.ipv4.sysctl_tcp_wmem,
1393 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1394 .mode = 0644,
1395 .proc_handler = proc_dointvec_minmax,
1396 .extra1 = SYSCTL_ONE,
1397 },
1398 {
1399 .procname = "tcp_rmem",
1400 .data = &init_net.ipv4.sysctl_tcp_rmem,
1401 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1402 .mode = 0644,
1403 .proc_handler = proc_dointvec_minmax,
1404 .extra1 = SYSCTL_ONE,
1405 },
1406 {
1407 .procname = "tcp_comp_sack_delay_ns",
1408 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1409 .maxlen = sizeof(unsigned long),
1410 .mode = 0644,
1411 .proc_handler = proc_doulongvec_minmax,
1412 },
1413 {
1414 .procname = "tcp_comp_sack_slack_ns",
1415 .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1416 .maxlen = sizeof(unsigned long),
1417 .mode = 0644,
1418 .proc_handler = proc_doulongvec_minmax,
1419 },
1420 {
1421 .procname = "tcp_comp_sack_nr",
1422 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1423 .maxlen = sizeof(u8),
1424 .mode = 0644,
1425 .proc_handler = proc_dou8vec_minmax,
1426 .extra1 = SYSCTL_ZERO,
1427 },
1428 {
1429 .procname = "tcp_backlog_ack_defer",
1430 .data = &init_net.ipv4.sysctl_tcp_backlog_ack_defer,
1431 .maxlen = sizeof(u8),
1432 .mode = 0644,
1433 .proc_handler = proc_dou8vec_minmax,
1434 .extra1 = SYSCTL_ZERO,
1435 .extra2 = SYSCTL_ONE,
1436 },
1437 {
1438 .procname = "tcp_reflect_tos",
1439 .data = &init_net.ipv4.sysctl_tcp_reflect_tos,
1440 .maxlen = sizeof(u8),
1441 .mode = 0644,
1442 .proc_handler = proc_dou8vec_minmax,
1443 .extra1 = SYSCTL_ZERO,
1444 .extra2 = SYSCTL_ONE,
1445 },
1446 {
1447 .procname = "tcp_ehash_entries",
1448 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1449 .mode = 0444,
1450 .proc_handler = proc_tcp_ehash_entries,
1451 },
1452 {
1453 .procname = "tcp_child_ehash_entries",
1454 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1455 .maxlen = sizeof(unsigned int),
1456 .mode = 0644,
1457 .proc_handler = proc_douintvec_minmax,
1458 .extra1 = SYSCTL_ZERO,
1459 .extra2 = &tcp_child_ehash_entries_max,
1460 },
1461 {
1462 .procname = "udp_hash_entries",
1463 .data = &init_net.ipv4.sysctl_udp_child_hash_entries,
1464 .mode = 0444,
1465 .proc_handler = proc_udp_hash_entries,
1466 },
1467 {
1468 .procname = "udp_child_hash_entries",
1469 .data = &init_net.ipv4.sysctl_udp_child_hash_entries,
1470 .maxlen = sizeof(unsigned int),
1471 .mode = 0644,
1472 .proc_handler = proc_douintvec_minmax,
1473 .extra1 = SYSCTL_ZERO,
1474 .extra2 = &udp_child_hash_entries_max,
1475 },
1476 {
1477 .procname = "udp_rmem_min",
1478 .data = &init_net.ipv4.sysctl_udp_rmem_min,
1479 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1480 .mode = 0644,
1481 .proc_handler = proc_dointvec_minmax,
1482 .extra1 = SYSCTL_ONE
1483 },
1484 {
1485 .procname = "udp_wmem_min",
1486 .data = &init_net.ipv4.sysctl_udp_wmem_min,
1487 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1488 .mode = 0644,
1489 .proc_handler = proc_dointvec_minmax,
1490 .extra1 = SYSCTL_ONE
1491 },
1492 {
1493 .procname = "fib_notify_on_flag_change",
1494 .data = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1495 .maxlen = sizeof(u8),
1496 .mode = 0644,
1497 .proc_handler = proc_dou8vec_minmax,
1498 .extra1 = SYSCTL_ZERO,
1499 .extra2 = SYSCTL_TWO,
1500 },
1501 {
1502 .procname = "tcp_plb_enabled",
1503 .data = &init_net.ipv4.sysctl_tcp_plb_enabled,
1504 .maxlen = sizeof(u8),
1505 .mode = 0644,
1506 .proc_handler = proc_dou8vec_minmax,
1507 .extra1 = SYSCTL_ZERO,
1508 .extra2 = SYSCTL_ONE,
1509 },
1510 {
1511 .procname = "tcp_plb_idle_rehash_rounds",
1512 .data = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds,
1513 .maxlen = sizeof(u8),
1514 .mode = 0644,
1515 .proc_handler = proc_dou8vec_minmax,
1516 .extra2 = &tcp_plb_max_rounds,
1517 },
1518 {
1519 .procname = "tcp_plb_rehash_rounds",
1520 .data = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds,
1521 .maxlen = sizeof(u8),
1522 .mode = 0644,
1523 .proc_handler = proc_dou8vec_minmax,
1524 .extra2 = &tcp_plb_max_rounds,
1525 },
1526 {
1527 .procname = "tcp_plb_suspend_rto_sec",
1528 .data = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec,
1529 .maxlen = sizeof(u8),
1530 .mode = 0644,
1531 .proc_handler = proc_dou8vec_minmax,
1532 },
1533 {
1534 .procname = "tcp_plb_cong_thresh",
1535 .data = &init_net.ipv4.sysctl_tcp_plb_cong_thresh,
1536 .maxlen = sizeof(int),
1537 .mode = 0644,
1538 .proc_handler = proc_dointvec_minmax,
1539 .extra1 = SYSCTL_ZERO,
1540 .extra2 = &tcp_plb_max_cong_thresh,
1541 },
1542 {
1543 .procname = "tcp_syn_linear_timeouts",
1544 .data = &init_net.ipv4.sysctl_tcp_syn_linear_timeouts,
1545 .maxlen = sizeof(u8),
1546 .mode = 0644,
1547 .proc_handler = proc_dou8vec_minmax,
1548 .extra1 = SYSCTL_ZERO,
1549 .extra2 = &tcp_syn_linear_timeouts_max,
1550 },
1551 {
1552 .procname = "tcp_shrink_window",
1553 .data = &init_net.ipv4.sysctl_tcp_shrink_window,
1554 .maxlen = sizeof(u8),
1555 .mode = 0644,
1556 .proc_handler = proc_dou8vec_minmax,
1557 .extra1 = SYSCTL_ZERO,
1558 .extra2 = SYSCTL_ONE,
1559 },
1560 {
1561 .procname = "tcp_pingpong_thresh",
1562 .data = &init_net.ipv4.sysctl_tcp_pingpong_thresh,
1563 .maxlen = sizeof(u8),
1564 .mode = 0644,
1565 .proc_handler = proc_dou8vec_minmax,
1566 .extra1 = SYSCTL_ONE,
1567 },
1568 {
1569 .procname = "tcp_rto_min_us",
1570 .data = &init_net.ipv4.sysctl_tcp_rto_min_us,
1571 .maxlen = sizeof(int),
1572 .mode = 0644,
1573 .proc_handler = proc_dointvec_minmax,
1574 .extra1 = SYSCTL_ONE,
1575 },
1576 };
1577
ipv4_sysctl_init_net(struct net * net)1578 static __net_init int ipv4_sysctl_init_net(struct net *net)
1579 {
1580 size_t table_size = ARRAY_SIZE(ipv4_net_table);
1581 struct ctl_table *table;
1582
1583 table = ipv4_net_table;
1584 if (!net_eq(net, &init_net)) {
1585 int i;
1586
1587 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1588 if (!table)
1589 goto err_alloc;
1590
1591 for (i = 0; i < table_size; i++) {
1592 if (table[i].data) {
1593 /* Update the variables to point into
1594 * the current struct net
1595 */
1596 table[i].data += (void *)net - (void *)&init_net;
1597 } else {
1598 /* Entries without data pointer are global;
1599 * Make them read-only in non-init_net ns
1600 */
1601 table[i].mode &= ~0222;
1602 }
1603 }
1604 }
1605
1606 net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table,
1607 table_size);
1608 if (!net->ipv4.ipv4_hdr)
1609 goto err_reg;
1610
1611 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1612 if (!net->ipv4.sysctl_local_reserved_ports)
1613 goto err_ports;
1614
1615 proc_fib_multipath_hash_set_seed(net, 0);
1616
1617 return 0;
1618
1619 err_ports:
1620 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1621 err_reg:
1622 if (!net_eq(net, &init_net))
1623 kfree(table);
1624 err_alloc:
1625 return -ENOMEM;
1626 }
1627
ipv4_sysctl_exit_net(struct net * net)1628 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1629 {
1630 const struct ctl_table *table;
1631
1632 kfree(net->ipv4.sysctl_local_reserved_ports);
1633 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1634 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1635 kfree(table);
1636 }
1637
1638 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1639 .init = ipv4_sysctl_init_net,
1640 .exit = ipv4_sysctl_exit_net,
1641 };
1642
sysctl_ipv4_init(void)1643 static __init int sysctl_ipv4_init(void)
1644 {
1645 struct ctl_table_header *hdr;
1646
1647 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1648 if (!hdr)
1649 return -ENOMEM;
1650
1651 proc_fib_multipath_hash_init_rand_seed();
1652
1653 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1654 unregister_net_sysctl_table(hdr);
1655 return -ENOMEM;
1656 }
1657
1658 return 0;
1659 }
1660
1661 __initcall(sysctl_ipv4_init);
1662