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                 .ctl_name       = NET_CORE_WMEM_MAX,
  21                 .procname       = "wmem_max",
  22                 .data           = &sysctl_wmem_max,
  23                 .maxlen         = sizeof(int),
  24                 .mode           = 0644,
  25                 .proc_handler   = proc_dointvec
  26         },
  27         {
  28                 .ctl_name       = NET_CORE_RMEM_MAX,
  29                 .procname       = "rmem_max",
  30                 .data           = &sysctl_rmem_max,
  31                 .maxlen         = sizeof(int),
  32                 .mode           = 0644,
  33                 .proc_handler   = proc_dointvec
  34         },
  35         {
  36                 .ctl_name       = NET_CORE_WMEM_DEFAULT,
  37                 .procname       = "wmem_default",
  38                 .data           = &sysctl_wmem_default,
  39                 .maxlen         = sizeof(int),
  40                 .mode           = 0644,
  41                 .proc_handler   = proc_dointvec
  42         },
  43         {
  44                 .ctl_name       = NET_CORE_RMEM_DEFAULT,
  45                 .procname       = "rmem_default",
  46                 .data           = &sysctl_rmem_default,
  47                 .maxlen         = sizeof(int),
  48                 .mode           = 0644,
  49                 .proc_handler   = proc_dointvec
  50         },
  51         {
  52                 .ctl_name       = NET_CORE_DEV_WEIGHT,
  53                 .procname       = "dev_weight",
  54                 .data           = &weight_p,
  55                 .maxlen         = sizeof(int),
  56                 .mode           = 0644,
  57                 .proc_handler   = proc_dointvec
  58         },
  59         {
  60                 .ctl_name       = NET_CORE_MAX_BACKLOG,
  61                 .procname       = "netdev_max_backlog",
  62                 .data           = &netdev_max_backlog,
  63                 .maxlen         = sizeof(int),
  64                 .mode           = 0644,
  65                 .proc_handler   = proc_dointvec
  66         },
  67         {
  68                 .ctl_name       = NET_CORE_MSG_COST,
  69                 .procname       = "message_cost",
  70                 .data           = &net_ratelimit_state.interval,
  71                 .maxlen         = sizeof(int),
  72                 .mode           = 0644,
  73                 .proc_handler   = proc_dointvec_jiffies,
  74                 .strategy       = sysctl_jiffies,
  75         },
  76         {
  77                 .ctl_name       = NET_CORE_MSG_BURST,
  78                 .procname       = "message_burst",
  79                 .data           = &net_ratelimit_state.burst,
  80                 .maxlen         = sizeof(int),
  81                 .mode           = 0644,
  82                 .proc_handler   = proc_dointvec,
  83         },
  84         {
  85                 .ctl_name       = NET_CORE_OPTMEM_MAX,
  86                 .procname       = "optmem_max",
  87                 .data           = &sysctl_optmem_max,
  88                 .maxlen         = sizeof(int),
  89                 .mode           = 0644,
  90                 .proc_handler   = proc_dointvec
  91         },
  92 #endif /* CONFIG_NET */
  93         {
  94                 .ctl_name       = NET_CORE_BUDGET,
  95                 .procname       = "netdev_budget",
  96                 .data           = &netdev_budget,
  97                 .maxlen         = sizeof(int),
  98                 .mode           = 0644,
  99                 .proc_handler   = proc_dointvec
 100         },
 101         {
 102                 .ctl_name       = NET_CORE_WARNINGS,
 103                 .procname       = "warnings",
 104                 .data           = &net_msg_warn,
 105                 .maxlen         = sizeof(int),
 106                 .mode           = 0644,
 107                 .proc_handler   = proc_dointvec
 108         },
 109         { .ctl_name = 0 }
 110 };
 111
 112 static struct ctl_table netns_core_table[] = {
 113         {
 114                 .ctl_name       = NET_CORE_SOMAXCONN,
 115                 .procname       = "somaxconn",
 116                 .data           = &init_net.core.sysctl_somaxconn,
 117                 .maxlen         = sizeof(int),
 118                 .mode           = 0644,
 119                 .proc_handler   = proc_dointvec
 120         },
 121         { .ctl_name = 0 }
 122 };
 123
 124 __net_initdata struct ctl_path net_core_path[] = {
 125         { .procname = "net", .ctl_name = CTL_NET, },
 126         { .procname = "core", .ctl_name = NET_CORE, },
 127         { },
 128 };
 129
 130 static __net_init int sysctl_core_net_init(struct net *net)
 131 {
 132         struct ctl_table *tbl;
 133
 134         net->core.sysctl_somaxconn = SOMAXCONN;
 135
 136         tbl = netns_core_table;
 137         if (net != &init_net) {
 138                 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
 139                 if (tbl == NULL)
 140                         goto err_dup;
 141
 142                 tbl[0].data = &net->core.sysctl_somaxconn;
 143         }
 144
 145         net->core.sysctl_hdr = register_net_sysctl_table(net,
 146                         net_core_path, tbl);
 147         if (net->core.sysctl_hdr == NULL)
 148                 goto err_reg;
 149
 150         return 0;
 151
 152 err_reg:
 153         if (tbl != netns_core_table)
 154                 kfree(tbl);
 155 err_dup:
 156         return -ENOMEM;
 157 }
 158
 159 static __net_exit void sysctl_core_net_exit(struct net *net)
 160 {
 161         struct ctl_table *tbl;
 162
 163         tbl = net->core.sysctl_hdr->ctl_table_arg;
 164         unregister_net_sysctl_table(net->core.sysctl_hdr);
 165         BUG_ON(tbl == netns_core_table);
 166         kfree(tbl);
 167 }
 168
 169 static __net_initdata struct pernet_operations sysctl_core_ops = {
 170         .init = sysctl_core_net_init,
 171         .exit = sysctl_core_net_exit,
 172 };
 173
 174 static __init int sysctl_core_init(void)
 175 {
 176         static struct ctl_table empty[1];
 177
 178         register_sysctl_paths(net_core_path, empty);
 179         register_net_sysctl_rotable(net_core_path, net_core_table);
 180         return register_pernet_subsys(&sysctl_core_ops);
 181 }
 182
 183 fs_initcall(sysctl_core_init);