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/init.h>
  14 #include <net/ip.h>
  15 #include <net/sock.h>
  16
  17 static struct ctl_table net_core_table[] = {
  18 #ifdef CONFIG_NET
  19         {
  20                 .procname       = "wmem_max",
  21                 .data           = &sysctl_wmem_max,
  22                 .maxlen         = sizeof(int),
  23                 .mode           = 0644,
  24                 .proc_handler   = proc_dointvec
  25         },
  26         {
  27                 .procname       = "rmem_max",
  28                 .data           = &sysctl_rmem_max,
  29                 .maxlen         = sizeof(int),
  30                 .mode           = 0644,
  31                 .proc_handler   = proc_dointvec
  32         },
  33         {
  34                 .procname       = "wmem_default",
  35                 .data           = &sysctl_wmem_default,
  36                 .maxlen         = sizeof(int),
  37                 .mode           = 0644,
  38                 .proc_handler   = proc_dointvec
  39         },
  40         {
  41                 .procname       = "rmem_default",
  42                 .data           = &sysctl_rmem_default,
  43                 .maxlen         = sizeof(int),
  44                 .mode           = 0644,
  45                 .proc_handler   = proc_dointvec
  46         },
  47         {
  48                 .procname       = "dev_weight",
  49                 .data           = &weight_p,
  50                 .maxlen         = sizeof(int),
  51                 .mode           = 0644,
  52                 .proc_handler   = proc_dointvec
  53         },
  54         {
  55                 .procname       = "netdev_max_backlog",
  56                 .data           = &netdev_max_backlog,
  57                 .maxlen         = sizeof(int),
  58                 .mode           = 0644,
  59                 .proc_handler   = proc_dointvec
  60         },
  61         {
  62                 .procname       = "message_cost",
  63                 .data           = &net_ratelimit_state.interval,
  64                 .maxlen         = sizeof(int),
  65                 .mode           = 0644,
  66                 .proc_handler   = proc_dointvec_jiffies,
  67         },
  68         {
  69                 .procname       = "message_burst",
  70                 .data           = &net_ratelimit_state.burst,
  71                 .maxlen         = sizeof(int),
  72                 .mode           = 0644,
  73                 .proc_handler   = proc_dointvec,
  74         },
  75         {
  76                 .procname       = "optmem_max",
  77                 .data           = &sysctl_optmem_max,
  78                 .maxlen         = sizeof(int),
  79                 .mode           = 0644,
  80                 .proc_handler   = proc_dointvec
  81         },
  82 #endif /* CONFIG_NET */
  83         {
  84                 .procname       = "netdev_budget",
  85                 .data           = &netdev_budget,
  86                 .maxlen         = sizeof(int),
  87                 .mode           = 0644,
  88                 .proc_handler   = proc_dointvec
  89         },
  90         {
  91                 .procname       = "warnings",
  92                 .data           = &net_msg_warn,
  93                 .maxlen         = sizeof(int),
  94                 .mode           = 0644,
  95                 .proc_handler   = proc_dointvec
  96         },
  97         { }
  98 };
  99
 100 static struct ctl_table netns_core_table[] = {
 101         {
 102                 .procname       = "somaxconn",
 103                 .data           = &init_net.core.sysctl_somaxconn,
 104                 .maxlen         = sizeof(int),
 105                 .mode           = 0644,
 106                 .proc_handler   = proc_dointvec
 107         },
 108         { }
 109 };
 110
 111 __net_initdata struct ctl_path net_core_path[] = {
 112         { .procname = "net", },
 113         { .procname = "core", },
 114         { },
 115 };
 116
 117 static __net_init int sysctl_core_net_init(struct net *net)
 118 {
 119         struct ctl_table *tbl;
 120
 121         net->core.sysctl_somaxconn = SOMAXCONN;
 122
 123         tbl = netns_core_table;
 124         if (net != &init_net) {
 125                 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
 126                 if (tbl == NULL)
 127                         goto err_dup;
 128
 129                 tbl[0].data = &net->core.sysctl_somaxconn;
 130         }
 131
 132         net->core.sysctl_hdr = register_net_sysctl_table(net,
 133                         net_core_path, tbl);
 134         if (net->core.sysctl_hdr == NULL)
 135                 goto err_reg;
 136
 137         return 0;
 138
 139 err_reg:
 140         if (tbl != netns_core_table)
 141                 kfree(tbl);
 142 err_dup:
 143         return -ENOMEM;
 144 }
 145
 146 static __net_exit void sysctl_core_net_exit(struct net *net)
 147 {
 148         struct ctl_table *tbl;
 149
 150         tbl = net->core.sysctl_hdr->ctl_table_arg;
 151         unregister_net_sysctl_table(net->core.sysctl_hdr);
 152         BUG_ON(tbl == netns_core_table);
 153         kfree(tbl);
 154 }
 155
 156 static __net_initdata struct pernet_operations sysctl_core_ops = {
 157         .init = sysctl_core_net_init,
 158         .exit = sysctl_core_net_exit,
 159 };
 160
 161 static __init int sysctl_core_init(void)
 162 {
 163         static struct ctl_table empty[1];
 164
 165         register_sysctl_paths(net_core_path, empty);
 166         register_net_sysctl_rotable(net_core_path, net_core_table);
 167         return register_pernet_subsys(&sysctl_core_ops);
 168 }
 169
 170 fs_initcall(sysctl_core_init);