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/init.h>
  15
  16 #include <net/ip.h>
  17 #include <net/sock.h>
  18
  19 static struct ctl_table net_core_table[] = {
  20 #ifdef CONFIG_NET
  21         {
  22                 .ctl_name       = NET_CORE_WMEM_MAX,
  23                 .procname       = "wmem_max",
  24                 .data           = &sysctl_wmem_max,
  25                 .maxlen         = sizeof(int),
  26                 .mode           = 0644,
  27                 .proc_handler   = proc_dointvec
  28         },
  29         {
  30                 .ctl_name       = NET_CORE_RMEM_MAX,
  31                 .procname       = "rmem_max",
  32                 .data           = &sysctl_rmem_max,
  33                 .maxlen         = sizeof(int),
  34                 .mode           = 0644,
  35                 .proc_handler   = proc_dointvec
  36         },
  37         {
  38                 .ctl_name       = NET_CORE_WMEM_DEFAULT,
  39                 .procname       = "wmem_default",
  40                 .data           = &sysctl_wmem_default,
  41                 .maxlen         = sizeof(int),
  42                 .mode           = 0644,
  43                 .proc_handler   = proc_dointvec
  44         },
  45         {
  46                 .ctl_name       = NET_CORE_RMEM_DEFAULT,
  47                 .procname       = "rmem_default",
  48                 .data           = &sysctl_rmem_default,
  49                 .maxlen         = sizeof(int),
  50                 .mode           = 0644,
  51                 .proc_handler   = proc_dointvec
  52         },
  53         {
  54                 .ctl_name       = NET_CORE_DEV_WEIGHT,
  55                 .procname       = "dev_weight",
  56                 .data           = &weight_p,
  57                 .maxlen         = sizeof(int),
  58                 .mode           = 0644,
  59                 .proc_handler   = proc_dointvec
  60         },
  61         {
  62                 .ctl_name       = NET_CORE_MAX_BACKLOG,
  63                 .procname       = "netdev_max_backlog",
  64                 .data           = &netdev_max_backlog,
  65                 .maxlen         = sizeof(int),
  66                 .mode           = 0644,
  67                 .proc_handler   = proc_dointvec
  68         },
  69         {
  70                 .ctl_name       = NET_CORE_MSG_COST,
  71                 .procname       = "message_cost",
  72                 .data           = &net_ratelimit_state.interval,
  73                 .maxlen         = sizeof(int),
  74                 .mode           = 0644,
  75                 .proc_handler   = proc_dointvec_jiffies,
  76                 .strategy       = sysctl_jiffies,
  77         },
  78         {
  79                 .ctl_name       = NET_CORE_MSG_BURST,
  80                 .procname       = "message_burst",
  81                 .data           = &net_ratelimit_state.burst,
  82                 .maxlen         = sizeof(int),
  83                 .mode           = 0644,
  84                 .proc_handler   = proc_dointvec,
  85         },
  86         {
  87                 .ctl_name       = NET_CORE_OPTMEM_MAX,
  88                 .procname       = "optmem_max",
  89                 .data           = &sysctl_optmem_max,
  90                 .maxlen         = sizeof(int),
  91                 .mode           = 0644,
  92                 .proc_handler   = proc_dointvec
  93         },
  94 #endif /* CONFIG_NET */
  95         {
  96                 .ctl_name       = NET_CORE_BUDGET,
  97                 .procname       = "netdev_budget",
  98                 .data           = &netdev_budget,
  99                 .maxlen         = sizeof(int),
 100                 .mode           = 0644,
 101                 .proc_handler   = proc_dointvec
 102         },
 103         {
 104                 .ctl_name       = NET_CORE_WARNINGS,
 105                 .procname       = "warnings",
 106                 .data           = &net_msg_warn,
 107                 .maxlen         = sizeof(int),
 108                 .mode           = 0644,
 109                 .proc_handler   = proc_dointvec
 110         },
 111         { .ctl_name = 0 }
 112 };
 113
 114 static struct ctl_table netns_core_table[] = {
 115         {
 116                 .ctl_name       = NET_CORE_SOMAXCONN,
 117                 .procname       = "somaxconn",
 118                 .data           = &init_net.core.sysctl_somaxconn,
 119                 .maxlen         = sizeof(int),
 120                 .mode           = 0644,
 121                 .proc_handler   = proc_dointvec
 122         },
 123         { .ctl_name = 0 }
 124 };
 125
 126 __net_initdata struct ctl_path net_core_path[] = {
 127         { .procname = "net", .ctl_name = CTL_NET, },
 128         { .procname = "core", .ctl_name = NET_CORE, },
 129         { },
 130 };
 131
 132 static __net_init int sysctl_core_net_init(struct net *net)
 133 {
 134         struct ctl_table *tbl;
 135
 136         net->core.sysctl_somaxconn = SOMAXCONN;
 137
 138         tbl = netns_core_table;
 139         if (net != &init_net) {
 140                 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
 141                 if (tbl == NULL)
 142                         goto err_dup;
 143
 144                 tbl[0].data = &net->core.sysctl_somaxconn;
 145         }
 146
 147         net->core.sysctl_hdr = register_net_sysctl_table(net,
 148                         net_core_path, tbl);
 149         if (net->core.sysctl_hdr == NULL)
 150                 goto err_reg;
 151
 152         return 0;
 153
 154 err_reg:
 155         if (tbl != netns_core_table)
 156                 kfree(tbl);
 157 err_dup:
 158         return -ENOMEM;
 159 }
 160
 161 static __net_exit void sysctl_core_net_exit(struct net *net)
 162 {
 163         struct ctl_table *tbl;
 164
 165         tbl = net->core.sysctl_hdr->ctl_table_arg;
 166         unregister_net_sysctl_table(net->core.sysctl_hdr);
 167         BUG_ON(tbl == netns_core_table);
 168         kfree(tbl);
 169 }
 170
 171 static __net_initdata struct pernet_operations sysctl_core_ops = {
 172         .init = sysctl_core_net_init,
 173         .exit = sysctl_core_net_exit,
 174 };
 175
 176 static __init int sysctl_core_init(void)
 177 {
 178         static struct ctl_table empty[1];
 179
 180         register_sysctl_paths(net_core_path, empty);
 181         register_net_sysctl_rotable(net_core_path, net_core_table);
 182         return register_pernet_subsys(&sysctl_core_ops);
 183 }
 184
 185 fs_initcall(sysctl_core_init);