Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* -*- linux-c -*- |
| 2 | * sysctl_net_core.c: sysctl interface to net core subsystem. |
| 3 | * |
| 4 | * Begun April 1, 1996, Mike Shaver. |
| 5 | * Added /proc/sys/net/core directory entry (empty =) ). [MS] |
| 6 | */ |
| 7 | |
| 8 | #include <linux/mm.h> |
| 9 | #include <linux/sysctl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/module.h> |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 11 | #include <linux/socket.h> |
Pavel Emelyanov | a37ae40 | 2007-10-23 21:13:53 -0700 | [diff] [blame] | 12 | #include <linux/netdevice.h> |
Ingo Molnar | 3fff4c4 | 2009-09-22 16:18:09 +0200 | [diff] [blame] | 13 | #include <linux/ratelimit.h> |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 14 | #include <linux/vmalloc.h> |
Pavel Emelyanov | 33eb9cf | 2007-12-05 01:37:34 -0800 | [diff] [blame] | 15 | #include <linux/init.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/slab.h> |
Shan Wei | 7426a56 | 2012-04-18 18:05:46 +0000 | [diff] [blame] | 17 | #include <linux/kmemleak.h> |
Ingo Molnar | 3fff4c4 | 2009-09-22 16:18:09 +0200 | [diff] [blame] | 18 | |
Hannes Eder | 63d819c | 2009-02-25 10:32:14 +0000 | [diff] [blame] | 19 | #include <net/ip.h> |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 20 | #include <net/sock.h> |
David S. Miller | c5c177b | 2011-05-27 13:41:33 -0400 | [diff] [blame] | 21 | #include <net/net_ratelimit.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
bingtian.ly@taobao.com | cdda889 | 2013-01-23 20:35:28 +0000 | [diff] [blame] | 23 | static int one = 1; |
| 24 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 25 | #ifdef CONFIG_RPS |
| 26 | static int rps_sock_flow_sysctl(ctl_table *table, int write, |
| 27 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 28 | { |
| 29 | unsigned int orig_size, size; |
| 30 | int ret, i; |
| 31 | ctl_table tmp = { |
| 32 | .data = &size, |
| 33 | .maxlen = sizeof(size), |
| 34 | .mode = table->mode |
| 35 | }; |
| 36 | struct rps_sock_flow_table *orig_sock_table, *sock_table; |
| 37 | static DEFINE_MUTEX(sock_flow_mutex); |
| 38 | |
| 39 | mutex_lock(&sock_flow_mutex); |
| 40 | |
Eric Dumazet | 6e3f7fa | 2010-10-25 03:02:02 +0000 | [diff] [blame] | 41 | orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, |
| 42 | lockdep_is_held(&sock_flow_mutex)); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 43 | size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0; |
| 44 | |
| 45 | ret = proc_dointvec(&tmp, write, buffer, lenp, ppos); |
| 46 | |
| 47 | if (write) { |
| 48 | if (size) { |
| 49 | if (size > 1<<30) { |
| 50 | /* Enforce limit to prevent overflow */ |
| 51 | mutex_unlock(&sock_flow_mutex); |
| 52 | return -EINVAL; |
| 53 | } |
| 54 | size = roundup_pow_of_two(size); |
| 55 | if (size != orig_size) { |
| 56 | sock_table = |
| 57 | vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size)); |
| 58 | if (!sock_table) { |
| 59 | mutex_unlock(&sock_flow_mutex); |
| 60 | return -ENOMEM; |
| 61 | } |
| 62 | |
| 63 | sock_table->mask = size - 1; |
| 64 | } else |
| 65 | sock_table = orig_sock_table; |
| 66 | |
| 67 | for (i = 0; i < size; i++) |
| 68 | sock_table->ents[i] = RPS_NO_CPU; |
| 69 | } else |
| 70 | sock_table = NULL; |
| 71 | |
| 72 | if (sock_table != orig_sock_table) { |
| 73 | rcu_assign_pointer(rps_sock_flow_table, sock_table); |
Eric Dumazet | adc9300 | 2011-11-17 03:13:26 +0000 | [diff] [blame] | 74 | if (sock_table) |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 75 | static_key_slow_inc(&rps_needed); |
Eric Dumazet | adc9300 | 2011-11-17 03:13:26 +0000 | [diff] [blame] | 76 | if (orig_sock_table) { |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 77 | static_key_slow_dec(&rps_needed); |
Eric Dumazet | adc9300 | 2011-11-17 03:13:26 +0000 | [diff] [blame] | 78 | synchronize_rcu(); |
| 79 | vfree(orig_sock_table); |
| 80 | } |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 81 | } |
| 82 | } |
| 83 | |
| 84 | mutex_unlock(&sock_flow_mutex); |
| 85 | |
| 86 | return ret; |
| 87 | } |
| 88 | #endif /* CONFIG_RPS */ |
| 89 | |
Willem de Bruijn | 99bbc70 | 2013-05-20 04:02:32 +0000 | [diff] [blame^] | 90 | #ifdef CONFIG_NET_FLOW_LIMIT |
| 91 | static DEFINE_MUTEX(flow_limit_update_mutex); |
| 92 | |
| 93 | static int flow_limit_cpu_sysctl(ctl_table *table, int write, |
| 94 | void __user *buffer, size_t *lenp, |
| 95 | loff_t *ppos) |
| 96 | { |
| 97 | struct sd_flow_limit *cur; |
| 98 | struct softnet_data *sd; |
| 99 | cpumask_var_t mask; |
| 100 | int i, len, ret = 0; |
| 101 | |
| 102 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
| 103 | return -ENOMEM; |
| 104 | |
| 105 | if (write) { |
| 106 | ret = cpumask_parse_user(buffer, *lenp, mask); |
| 107 | if (ret) |
| 108 | goto done; |
| 109 | |
| 110 | mutex_lock(&flow_limit_update_mutex); |
| 111 | len = sizeof(*cur) + netdev_flow_limit_table_len; |
| 112 | for_each_possible_cpu(i) { |
| 113 | sd = &per_cpu(softnet_data, i); |
| 114 | cur = rcu_dereference_protected(sd->flow_limit, |
| 115 | lockdep_is_held(&flow_limit_update_mutex)); |
| 116 | if (cur && !cpumask_test_cpu(i, mask)) { |
| 117 | RCU_INIT_POINTER(sd->flow_limit, NULL); |
| 118 | synchronize_rcu(); |
| 119 | kfree(cur); |
| 120 | } else if (!cur && cpumask_test_cpu(i, mask)) { |
| 121 | cur = kzalloc(len, GFP_KERNEL); |
| 122 | if (!cur) { |
| 123 | /* not unwinding previous changes */ |
| 124 | ret = -ENOMEM; |
| 125 | goto write_unlock; |
| 126 | } |
| 127 | cur->num_buckets = netdev_flow_limit_table_len; |
| 128 | rcu_assign_pointer(sd->flow_limit, cur); |
| 129 | } |
| 130 | } |
| 131 | write_unlock: |
| 132 | mutex_unlock(&flow_limit_update_mutex); |
| 133 | } else { |
| 134 | if (*ppos || !*lenp) { |
| 135 | *lenp = 0; |
| 136 | goto done; |
| 137 | } |
| 138 | |
| 139 | cpumask_clear(mask); |
| 140 | rcu_read_lock(); |
| 141 | for_each_possible_cpu(i) { |
| 142 | sd = &per_cpu(softnet_data, i); |
| 143 | if (rcu_dereference(sd->flow_limit)) |
| 144 | cpumask_set_cpu(i, mask); |
| 145 | } |
| 146 | rcu_read_unlock(); |
| 147 | |
| 148 | len = cpumask_scnprintf(buffer, *lenp, mask); |
| 149 | *lenp = len + 1; |
| 150 | *ppos += len + 1; |
| 151 | } |
| 152 | |
| 153 | done: |
| 154 | free_cpumask_var(mask); |
| 155 | return ret; |
| 156 | } |
| 157 | |
| 158 | static int flow_limit_table_len_sysctl(ctl_table *table, int write, |
| 159 | void __user *buffer, size_t *lenp, |
| 160 | loff_t *ppos) |
| 161 | { |
| 162 | unsigned int old, *ptr; |
| 163 | int ret; |
| 164 | |
| 165 | mutex_lock(&flow_limit_update_mutex); |
| 166 | |
| 167 | ptr = table->data; |
| 168 | old = *ptr; |
| 169 | ret = proc_dointvec(table, write, buffer, lenp, ppos); |
| 170 | if (!ret && write && !is_power_of_2(*ptr)) { |
| 171 | *ptr = old; |
| 172 | ret = -EINVAL; |
| 173 | } |
| 174 | |
| 175 | mutex_unlock(&flow_limit_update_mutex); |
| 176 | return ret; |
| 177 | } |
| 178 | #endif /* CONFIG_NET_FLOW_LIMIT */ |
| 179 | |
Pavel Emelyanov | 33eb9cf | 2007-12-05 01:37:34 -0800 | [diff] [blame] | 180 | static struct ctl_table net_core_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | #ifdef CONFIG_NET |
| 182 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | .procname = "wmem_max", |
| 184 | .data = &sysctl_wmem_max, |
| 185 | .maxlen = sizeof(int), |
| 186 | .mode = 0644, |
bingtian.ly@taobao.com | cdda889 | 2013-01-23 20:35:28 +0000 | [diff] [blame] | 187 | .proc_handler = proc_dointvec_minmax, |
| 188 | .extra1 = &one, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | }, |
| 190 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | .procname = "rmem_max", |
| 192 | .data = &sysctl_rmem_max, |
| 193 | .maxlen = sizeof(int), |
| 194 | .mode = 0644, |
bingtian.ly@taobao.com | cdda889 | 2013-01-23 20:35:28 +0000 | [diff] [blame] | 195 | .proc_handler = proc_dointvec_minmax, |
| 196 | .extra1 = &one, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | }, |
| 198 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | .procname = "wmem_default", |
| 200 | .data = &sysctl_wmem_default, |
| 201 | .maxlen = sizeof(int), |
| 202 | .mode = 0644, |
bingtian.ly@taobao.com | cdda889 | 2013-01-23 20:35:28 +0000 | [diff] [blame] | 203 | .proc_handler = proc_dointvec_minmax, |
| 204 | .extra1 = &one, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | }, |
| 206 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | .procname = "rmem_default", |
| 208 | .data = &sysctl_rmem_default, |
| 209 | .maxlen = sizeof(int), |
| 210 | .mode = 0644, |
bingtian.ly@taobao.com | cdda889 | 2013-01-23 20:35:28 +0000 | [diff] [blame] | 211 | .proc_handler = proc_dointvec_minmax, |
| 212 | .extra1 = &one, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | }, |
| 214 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | .procname = "dev_weight", |
| 216 | .data = &weight_p, |
| 217 | .maxlen = sizeof(int), |
| 218 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 219 | .proc_handler = proc_dointvec |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | }, |
| 221 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | .procname = "netdev_max_backlog", |
| 223 | .data = &netdev_max_backlog, |
| 224 | .maxlen = sizeof(int), |
| 225 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 226 | .proc_handler = proc_dointvec |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | }, |
Eric Dumazet | 0a14842 | 2011-04-20 09:27:32 +0000 | [diff] [blame] | 228 | #ifdef CONFIG_BPF_JIT |
| 229 | { |
| 230 | .procname = "bpf_jit_enable", |
| 231 | .data = &bpf_jit_enable, |
| 232 | .maxlen = sizeof(int), |
| 233 | .mode = 0644, |
| 234 | .proc_handler = proc_dointvec |
| 235 | }, |
| 236 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | { |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 238 | .procname = "netdev_tstamp_prequeue", |
| 239 | .data = &netdev_tstamp_prequeue, |
| 240 | .maxlen = sizeof(int), |
| 241 | .mode = 0644, |
| 242 | .proc_handler = proc_dointvec |
| 243 | }, |
| 244 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | .procname = "message_cost", |
Dave Young | 717115e | 2008-07-25 01:45:58 -0700 | [diff] [blame] | 246 | .data = &net_ratelimit_state.interval, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | .maxlen = sizeof(int), |
| 248 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 249 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | }, |
| 251 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | .procname = "message_burst", |
Dave Young | 717115e | 2008-07-25 01:45:58 -0700 | [diff] [blame] | 253 | .data = &net_ratelimit_state.burst, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | .maxlen = sizeof(int), |
| 255 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 256 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | }, |
| 258 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | .procname = "optmem_max", |
| 260 | .data = &sysctl_optmem_max, |
| 261 | .maxlen = sizeof(int), |
| 262 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 263 | .proc_handler = proc_dointvec |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | }, |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 265 | #ifdef CONFIG_RPS |
| 266 | { |
| 267 | .procname = "rps_sock_flow_entries", |
| 268 | .maxlen = sizeof(int), |
| 269 | .mode = 0644, |
| 270 | .proc_handler = rps_sock_flow_sysctl |
| 271 | }, |
| 272 | #endif |
Willem de Bruijn | 99bbc70 | 2013-05-20 04:02:32 +0000 | [diff] [blame^] | 273 | #ifdef CONFIG_NET_FLOW_LIMIT |
| 274 | { |
| 275 | .procname = "flow_limit_cpu_bitmap", |
| 276 | .mode = 0644, |
| 277 | .proc_handler = flow_limit_cpu_sysctl |
| 278 | }, |
| 279 | { |
| 280 | .procname = "flow_limit_table_len", |
| 281 | .data = &netdev_flow_limit_table_len, |
| 282 | .maxlen = sizeof(int), |
| 283 | .mode = 0644, |
| 284 | .proc_handler = flow_limit_table_len_sysctl |
| 285 | }, |
| 286 | #endif /* CONFIG_NET_FLOW_LIMIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | #endif /* CONFIG_NET */ |
| 288 | { |
Stephen Hemminger | 51b0bde | 2005-06-23 20:14:40 -0700 | [diff] [blame] | 289 | .procname = "netdev_budget", |
| 290 | .data = &netdev_budget, |
| 291 | .maxlen = sizeof(int), |
| 292 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 293 | .proc_handler = proc_dointvec |
Stephen Hemminger | 51b0bde | 2005-06-23 20:14:40 -0700 | [diff] [blame] | 294 | }, |
Stephen Hemminger | a2a316f | 2007-03-08 20:41:08 -0800 | [diff] [blame] | 295 | { |
Stephen Hemminger | a2a316f | 2007-03-08 20:41:08 -0800 | [diff] [blame] | 296 | .procname = "warnings", |
| 297 | .data = &net_msg_warn, |
| 298 | .maxlen = sizeof(int), |
| 299 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 300 | .proc_handler = proc_dointvec |
Stephen Hemminger | a2a316f | 2007-03-08 20:41:08 -0800 | [diff] [blame] | 301 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 302 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | }; |
Pavel Emelyanov | 33eb9cf | 2007-12-05 01:37:34 -0800 | [diff] [blame] | 304 | |
Pavel Emelyanov | d5a4502 | 2008-05-19 13:49:52 -0700 | [diff] [blame] | 305 | static struct ctl_table netns_core_table[] = { |
| 306 | { |
Pavel Emelyanov | d5a4502 | 2008-05-19 13:49:52 -0700 | [diff] [blame] | 307 | .procname = "somaxconn", |
| 308 | .data = &init_net.core.sysctl_somaxconn, |
| 309 | .maxlen = sizeof(int), |
| 310 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 311 | .proc_handler = proc_dointvec |
Pavel Emelyanov | d5a4502 | 2008-05-19 13:49:52 -0700 | [diff] [blame] | 312 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 313 | { } |
Pavel Emelyanov | d5a4502 | 2008-05-19 13:49:52 -0700 | [diff] [blame] | 314 | }; |
| 315 | |
Pavel Emelyanov | 024626e | 2007-12-08 00:09:24 -0800 | [diff] [blame] | 316 | static __net_init int sysctl_core_net_init(struct net *net) |
| 317 | { |
Pavel Emelyanov | d5a4502 | 2008-05-19 13:49:52 -0700 | [diff] [blame] | 318 | struct ctl_table *tbl; |
Pavel Emelyanov | 024626e | 2007-12-08 00:09:24 -0800 | [diff] [blame] | 319 | |
Pavel Emelyanov | 8efa6e9 | 2008-03-31 19:41:14 -0700 | [diff] [blame] | 320 | net->core.sysctl_somaxconn = SOMAXCONN; |
Pavel Emelyanov | b8e1f9b | 2007-12-08 00:12:33 -0800 | [diff] [blame] | 321 | |
Pavel Emelyanov | d5a4502 | 2008-05-19 13:49:52 -0700 | [diff] [blame] | 322 | tbl = netns_core_table; |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 323 | if (!net_eq(net, &init_net)) { |
Pavel Emelyanov | d5a4502 | 2008-05-19 13:49:52 -0700 | [diff] [blame] | 324 | tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); |
Pavel Emelyanov | 024626e | 2007-12-08 00:09:24 -0800 | [diff] [blame] | 325 | if (tbl == NULL) |
| 326 | goto err_dup; |
| 327 | |
Pavel Emelyanov | d5a4502 | 2008-05-19 13:49:52 -0700 | [diff] [blame] | 328 | tbl[0].data = &net->core.sysctl_somaxconn; |
Eric W. Biederman | 464dc80 | 2012-11-16 03:02:59 +0000 | [diff] [blame] | 329 | |
| 330 | /* Don't export any sysctls to unprivileged users */ |
| 331 | if (net->user_ns != &init_user_ns) { |
| 332 | tbl[0].procname = NULL; |
| 333 | } |
Pavel Emelyanov | 024626e | 2007-12-08 00:09:24 -0800 | [diff] [blame] | 334 | } |
| 335 | |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 336 | net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl); |
Pavel Emelyanov | 8efa6e9 | 2008-03-31 19:41:14 -0700 | [diff] [blame] | 337 | if (net->core.sysctl_hdr == NULL) |
Pavel Emelyanov | 024626e | 2007-12-08 00:09:24 -0800 | [diff] [blame] | 338 | goto err_reg; |
| 339 | |
| 340 | return 0; |
| 341 | |
| 342 | err_reg: |
Pavel Emelyanov | d5a4502 | 2008-05-19 13:49:52 -0700 | [diff] [blame] | 343 | if (tbl != netns_core_table) |
Pavel Emelyanov | 024626e | 2007-12-08 00:09:24 -0800 | [diff] [blame] | 344 | kfree(tbl); |
| 345 | err_dup: |
| 346 | return -ENOMEM; |
| 347 | } |
| 348 | |
| 349 | static __net_exit void sysctl_core_net_exit(struct net *net) |
| 350 | { |
| 351 | struct ctl_table *tbl; |
| 352 | |
Pavel Emelyanov | 8efa6e9 | 2008-03-31 19:41:14 -0700 | [diff] [blame] | 353 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
| 354 | unregister_net_sysctl_table(net->core.sysctl_hdr); |
Pavel Emelyanov | d5a4502 | 2008-05-19 13:49:52 -0700 | [diff] [blame] | 355 | BUG_ON(tbl == netns_core_table); |
Pavel Emelyanov | 024626e | 2007-12-08 00:09:24 -0800 | [diff] [blame] | 356 | kfree(tbl); |
| 357 | } |
| 358 | |
| 359 | static __net_initdata struct pernet_operations sysctl_core_ops = { |
| 360 | .init = sysctl_core_net_init, |
| 361 | .exit = sysctl_core_net_exit, |
| 362 | }; |
| 363 | |
Pavel Emelyanov | 33eb9cf | 2007-12-05 01:37:34 -0800 | [diff] [blame] | 364 | static __init int sysctl_core_init(void) |
| 365 | { |
Eric W. Biederman | 4344475 | 2012-04-19 13:22:55 +0000 | [diff] [blame] | 366 | register_net_sysctl(&init_net, "net/core", net_core_table); |
Pavel Emelyanov | 024626e | 2007-12-08 00:09:24 -0800 | [diff] [blame] | 367 | return register_pernet_subsys(&sysctl_core_ops); |
Pavel Emelyanov | 33eb9cf | 2007-12-05 01:37:34 -0800 | [diff] [blame] | 368 | } |
| 369 | |
Alexey Dobriyan | b27aead | 2008-11-25 18:00:48 -0800 | [diff] [blame] | 370 | fs_initcall(sysctl_core_init); |