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