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