Linux/net/core/sysctl_net_core.c

  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>
 10 #include <linux/module.h>
 11 #include <linux/socket.h>
 12 #include <linux/netdevice.h>
 13 #include <linux/ratelimit.h>
 14 #include <linux/vmalloc.h>
 15 #include <linux/init.h>
 16 #include <linux/slab.h>
 17 #include <linux/kmemleak.h>
 18 
 19 #include <net/ip.h>
 20 #include <net/sock.h>
 21 #include <net/net_ratelimit.h>
 22 
 23 static int one = 1;
 24 
 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 
 41         orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
 42                                         lockdep_is_held(&sock_flow_mutex));
 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);
 74                         if (sock_table)
 75                                 static_key_slow_inc(&rps_needed);
 76                         if (orig_sock_table) {
 77                                 static_key_slow_dec(&rps_needed);
 78                                 synchronize_rcu();
 79                                 vfree(orig_sock_table);
 80                         }
 81                 }
 82         }
 83 
 84         mutex_unlock(&sock_flow_mutex);
 85 
 86         return ret;
 87 }
 88 #endif /* CONFIG_RPS */
 89 
 90 static struct ctl_table net_core_table[] = {
 91 #ifdef CONFIG_NET
 92         {
 93                 .procname       = "wmem_max",
 94                 .data           = &sysctl_wmem_max,
 95                 .maxlen         = sizeof(int),
 96                 .mode           = 0644,
 97                 .proc_handler   = proc_dointvec_minmax,
 98                 .extra1         = &one,
 99         },
100         {
101                 .procname       = "rmem_max",
102                 .data           = &sysctl_rmem_max,
103                 .maxlen         = sizeof(int),
104                 .mode           = 0644,
105                 .proc_handler   = proc_dointvec_minmax,
106                 .extra1         = &one,
107         },
108         {
109                 .procname       = "wmem_default",
110                 .data           = &sysctl_wmem_default,
111                 .maxlen         = sizeof(int),
112                 .mode           = 0644,
113                 .proc_handler   = proc_dointvec_minmax,
114                 .extra1         = &one,
115         },
116         {
117                 .procname       = "rmem_default",
118                 .data           = &sysctl_rmem_default,
119                 .maxlen         = sizeof(int),
120                 .mode           = 0644,
121                 .proc_handler   = proc_dointvec_minmax,
122                 .extra1         = &one,
123         },
124         {
125                 .procname       = "dev_weight",
126                 .data           = &weight_p,
127                 .maxlen         = sizeof(int),
128                 .mode           = 0644,
129                 .proc_handler   = proc_dointvec
130         },
131         {
132                 .procname       = "netdev_max_backlog",
133                 .data           = &netdev_max_backlog,
134                 .maxlen         = sizeof(int),
135                 .mode           = 0644,
136                 .proc_handler   = proc_dointvec
137         },
138 #ifdef CONFIG_BPF_JIT
139         {
140                 .procname       = "bpf_jit_enable",
141                 .data           = &bpf_jit_enable,
142                 .maxlen         = sizeof(int),
143                 .mode           = 0644,
144                 .proc_handler   = proc_dointvec
145         },
146 #endif
147         {
148                 .procname       = "netdev_tstamp_prequeue",
149                 .data           = &netdev_tstamp_prequeue,
150                 .maxlen         = sizeof(int),
151                 .mode           = 0644,
152                 .proc_handler   = proc_dointvec
153         },
154         {
155                 .procname       = "message_cost",
156                 .data           = &net_ratelimit_state.interval,
157                 .maxlen         = sizeof(int),
158                 .mode           = 0644,
159                 .proc_handler   = proc_dointvec_jiffies,
160         },
161         {
162                 .procname       = "message_burst",
163                 .data           = &net_ratelimit_state.burst,
164                 .maxlen         = sizeof(int),
165                 .mode           = 0644,
166                 .proc_handler   = proc_dointvec,
167         },
168         {
169                 .procname       = "optmem_max",
170                 .data           = &sysctl_optmem_max,
171                 .maxlen         = sizeof(int),
172                 .mode           = 0644,
173                 .proc_handler   = proc_dointvec
174         },
175 #ifdef CONFIG_RPS
176         {
177                 .procname       = "rps_sock_flow_entries",
178                 .maxlen         = sizeof(int),
179                 .mode           = 0644,
180                 .proc_handler   = rps_sock_flow_sysctl
181         },
182 #endif
183 #endif /* CONFIG_NET */
184         {
185                 .procname       = "netdev_budget",
186                 .data           = &netdev_budget,
187                 .maxlen         = sizeof(int),
188                 .mode           = 0644,
189                 .proc_handler   = proc_dointvec
190         },
191         {
192                 .procname       = "warnings",
193                 .data           = &net_msg_warn,
194                 .maxlen         = sizeof(int),
195                 .mode           = 0644,
196                 .proc_handler   = proc_dointvec
197         },
198         { }
199 };
200 
201 static struct ctl_table netns_core_table[] = {
202         {
203                 .procname       = "somaxconn",
204                 .data           = &init_net.core.sysctl_somaxconn,
205                 .maxlen         = sizeof(int),
206                 .mode           = 0644,
207                 .proc_handler   = proc_dointvec
208         },
209         { }
210 };
211 
212 static __net_init int sysctl_core_net_init(struct net *net)
213 {
214         struct ctl_table *tbl;
215 
216         net->core.sysctl_somaxconn = SOMAXCONN;
217 
218         tbl = netns_core_table;
219         if (!net_eq(net, &init_net)) {
220                 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
221                 if (tbl == NULL)
222                         goto err_dup;
223 
224                 tbl[0].data = &net->core.sysctl_somaxconn;
225 
226                 /* Don't export any sysctls to unprivileged users */
227                 if (net->user_ns != &init_user_ns) {
228                         tbl[0].procname = NULL;
229                 }
230         }
231 
232         net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
233         if (net->core.sysctl_hdr == NULL)
234                 goto err_reg;
235 
236         return 0;
237 
238 err_reg:
239         if (tbl != netns_core_table)
240                 kfree(tbl);
241 err_dup:
242         return -ENOMEM;
243 }
244 
245 static __net_exit void sysctl_core_net_exit(struct net *net)
246 {
247         struct ctl_table *tbl;
248 
249         tbl = net->core.sysctl_hdr->ctl_table_arg;
250         unregister_net_sysctl_table(net->core.sysctl_hdr);
251         BUG_ON(tbl == netns_core_table);
252         kfree(tbl);
253 }
254 
255 static __net_initdata struct pernet_operations sysctl_core_ops = {
256         .init = sysctl_core_net_init,
257         .exit = sysctl_core_net_exit,
258 };
259 
260 static __init int sysctl_core_init(void)
261 {
262         register_net_sysctl(&init_net, "net/core", net_core_table);
263         return register_pernet_subsys(&sysctl_core_ops);
264 }
265 
266 fs_initcall(sysctl_core_init);
267 

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