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/sock.h>
  15
  16 static struct ctl_table net_core_table[] = {
  17 #ifdef CONFIG_NET
  18         {
  19                 .ctl_name       = NET_CORE_WMEM_MAX,
  20                 .procname       = "wmem_max",
  21                 .data           = &sysctl_wmem_max,
  22                 .maxlen         = sizeof(int),
  23                 .mode           = 0644,
  24                 .proc_handler   = proc_dointvec
  25         },
  26         {
  27                 .ctl_name       = NET_CORE_RMEM_MAX,
  28                 .procname       = "rmem_max",
  29                 .data           = &sysctl_rmem_max,
  30                 .maxlen         = sizeof(int),
  31                 .mode           = 0644,
  32                 .proc_handler   = proc_dointvec
  33         },
  34         {
  35                 .ctl_name       = NET_CORE_WMEM_DEFAULT,
  36                 .procname       = "wmem_default",
  37                 .data           = &sysctl_wmem_default,
  38                 .maxlen         = sizeof(int),
  39                 .mode           = 0644,
  40                 .proc_handler   = proc_dointvec
  41         },
  42         {
  43                 .ctl_name       = NET_CORE_RMEM_DEFAULT,
  44                 .procname       = "rmem_default",
  45                 .data           = &sysctl_rmem_default,
  46                 .maxlen         = sizeof(int),
  47                 .mode           = 0644,
  48                 .proc_handler   = proc_dointvec
  49         },
  50         {
  51                 .ctl_name       = NET_CORE_DEV_WEIGHT,
  52                 .procname       = "dev_weight",
  53                 .data           = &weight_p,
  54                 .maxlen         = sizeof(int),
  55                 .mode           = 0644,
  56                 .proc_handler   = proc_dointvec
  57         },
  58         {
  59                 .ctl_name       = NET_CORE_MAX_BACKLOG,
  60                 .procname       = "netdev_max_backlog",
  61                 .data           = &netdev_max_backlog,
  62                 .maxlen         = sizeof(int),
  63                 .mode           = 0644,
  64                 .proc_handler   = proc_dointvec
  65         },
  66         {
  67                 .ctl_name       = NET_CORE_MSG_COST,
  68                 .procname       = "message_cost",
  69                 .data           = &net_ratelimit_state.interval,
  70                 .maxlen         = sizeof(int),
  71                 .mode           = 0644,
  72                 .proc_handler   = proc_dointvec_jiffies,
  73                 .strategy       = sysctl_jiffies,
  74         },
  75         {
  76                 .ctl_name       = NET_CORE_MSG_BURST,
  77                 .procname       = "message_burst",
  78                 .data           = &net_ratelimit_state.burst,
  79                 .maxlen         = sizeof(int),
  80                 .mode           = 0644,
  81                 .proc_handler   = proc_dointvec,
  82         },
  83         {
  84                 .ctl_name       = NET_CORE_OPTMEM_MAX,
  85                 .procname       = "optmem_max",
  86                 .data           = &sysctl_optmem_max,
  87                 .maxlen         = sizeof(int),
  88                 .mode           = 0644,
  89                 .proc_handler   = proc_dointvec
  90         },
  91 #endif /* CONFIG_NET */
  92         {
  93                 .ctl_name       = NET_CORE_BUDGET,
  94                 .procname       = "netdev_budget",
  95                 .data           = &netdev_budget,
  96                 .maxlen         = sizeof(int),
  97                 .mode           = 0644,
  98                 .proc_handler   = proc_dointvec
  99         },
 100         {
 101                 .ctl_name       = NET_CORE_WARNINGS,
 102                 .procname       = "warnings",
 103                 .data           = &net_msg_warn,
 104                 .maxlen         = sizeof(int),
 105                 .mode           = 0644,
 106                 .proc_handler   = proc_dointvec
 107         },
 108         { .ctl_name = 0 }
 109 };
 110
 111 static struct ctl_table netns_core_table[] = {
 112         {
 113                 .ctl_name       = NET_CORE_SOMAXCONN,
 114                 .procname       = "somaxconn",
 115                 .data           = &init_net.core.sysctl_somaxconn,
 116                 .maxlen         = sizeof(int),
 117                 .mode           = 0644,
 118                 .proc_handler   = proc_dointvec
 119         },
 120         { .ctl_name = 0 }
 121 };
 122
 123 __net_initdata struct ctl_path net_core_path[] = {
 124         { .procname = "net", .ctl_name = CTL_NET, },
 125         { .procname = "core", .ctl_name = NET_CORE, },
 126         { },
 127 };
 128
 129 static __net_init int sysctl_core_net_init(struct net *net)
 130 {
 131         struct ctl_table *tbl;
 132
 133         net->core.sysctl_somaxconn = SOMAXCONN;
 134
 135         tbl = netns_core_table;
 136         if (net != &init_net) {
 137                 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
 138                 if (tbl == NULL)
 139                         goto err_dup;
 140
 141                 tbl[0].data = &net->core.sysctl_somaxconn;
 142         }
 143
 144         net->core.sysctl_hdr = register_net_sysctl_table(net,
 145                         net_core_path, tbl);
 146         if (net->core.sysctl_hdr == NULL)
 147                 goto err_reg;
 148
 149         return 0;
 150
 151 err_reg:
 152         if (tbl != netns_core_table)
 153                 kfree(tbl);
 154 err_dup:
 155         return -ENOMEM;
 156 }
 157
 158 static __net_exit void sysctl_core_net_exit(struct net *net)
 159 {
 160         struct ctl_table *tbl;
 161
 162         tbl = net->core.sysctl_hdr->ctl_table_arg;
 163         unregister_net_sysctl_table(net->core.sysctl_hdr);
 164         BUG_ON(tbl == netns_core_table);
 165         kfree(tbl);
 166 }
 167
 168 static __net_initdata struct pernet_operations sysctl_core_ops = {
 169         .init = sysctl_core_net_init,
 170         .exit = sysctl_core_net_exit,
 171 };
 172
 173 static __init int sysctl_core_init(void)
 174 {
 175         static struct ctl_table empty[1];
 176
 177         register_sysctl_paths(net_core_path, empty);
 178         register_net_sysctl_rotable(net_core_path, net_core_table);
 179         return register_pernet_subsys(&sysctl_core_ops);
 180 }
 181
 182 fs_initcall(sysctl_core_init);