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 #include <net/xfrm.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_msg_cost,
  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_msg_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 #ifdef CONFIG_XFRM
  93         {
  94                 .ctl_name       = NET_CORE_AEVENT_ETIME,
  95                 .procname       = "xfrm_aevent_etime",
  96                 .data           = &sysctl_xfrm_aevent_etime,
  97                 .maxlen         = sizeof(u32),
  98                 .mode           = 0644,
  99                 .proc_handler   = &proc_dointvec
 100         },
 101         {
 102                 .ctl_name       = NET_CORE_AEVENT_RSEQTH,
 103                 .procname       = "xfrm_aevent_rseqth",
 104                 .data           = &sysctl_xfrm_aevent_rseqth,
 105                 .maxlen         = sizeof(u32),
 106                 .mode           = 0644,
 107                 .proc_handler   = &proc_dointvec
 108         },
 109         {
 110                 .ctl_name       = CTL_UNNUMBERED,
 111                 .procname       = "xfrm_larval_drop",
 112                 .data           = &sysctl_xfrm_larval_drop,
 113                 .maxlen         = sizeof(int),
 114                 .mode           = 0644,
 115                 .proc_handler   = &proc_dointvec
 116         },
 117         {
 118                 .ctl_name       = CTL_UNNUMBERED,
 119                 .procname       = "xfrm_acq_expires",
 120                 .data           = &sysctl_xfrm_acq_expires,
 121                 .maxlen         = sizeof(int),
 122                 .mode           = 0644,
 123                 .proc_handler   = &proc_dointvec
 124         },
 125 #endif /* CONFIG_XFRM */
 126 #endif /* CONFIG_NET */
 127         {
 128                 .ctl_name       = NET_CORE_SOMAXCONN,
 129                 .procname       = "somaxconn",
 130                 .data           = &init_net.core.sysctl_somaxconn,
 131                 .maxlen         = sizeof(int),
 132                 .mode           = 0644,
 133                 .proc_handler   = &proc_dointvec
 134         },
 135         {
 136                 .ctl_name       = NET_CORE_BUDGET,
 137                 .procname       = "netdev_budget",
 138                 .data           = &netdev_budget,
 139                 .maxlen         = sizeof(int),
 140                 .mode           = 0644,
 141                 .proc_handler   = &proc_dointvec
 142         },
 143         {
 144                 .ctl_name       = NET_CORE_WARNINGS,
 145                 .procname       = "warnings",
 146                 .data           = &net_msg_warn,
 147                 .maxlen         = sizeof(int),
 148                 .mode           = 0644,
 149                 .proc_handler   = &proc_dointvec
 150         },
 151         { .ctl_name = 0 }
 152 };
 153
 154 static __net_initdata struct ctl_path net_core_path[] = {
 155         { .procname = "net", .ctl_name = CTL_NET, },
 156         { .procname = "core", .ctl_name = NET_CORE, },
 157         { },
 158 };
 159
 160 static __net_init int sysctl_core_net_init(struct net *net)
 161 {
 162         struct ctl_table *tbl, *tmp;
 163
 164         net->core.sysctl_somaxconn = SOMAXCONN;
 165
 166         tbl = net_core_table;
 167         if (net != &init_net) {
 168                 tbl = kmemdup(tbl, sizeof(net_core_table), GFP_KERNEL);
 169                 if (tbl == NULL)
 170                         goto err_dup;
 171
 172                 for (tmp = tbl; tmp->procname; tmp++) {
 173                         if (tmp->data >= (void *)&init_net &&
 174                                         tmp->data < (void *)(&init_net + 1))
 175                                 tmp->data += (char *)net - (char *)&init_net;
 176                         else
 177                                 tmp->mode &= ~0222;
 178                 }
 179         }
 180
 181         net->core.sysctl_hdr = register_net_sysctl_table(net,
 182                         net_core_path, tbl);
 183         if (net->core.sysctl_hdr == NULL)
 184                 goto err_reg;
 185
 186         return 0;
 187
 188 err_reg:
 189         if (tbl != net_core_table)
 190                 kfree(tbl);
 191 err_dup:
 192         return -ENOMEM;
 193 }
 194
 195 static __net_exit void sysctl_core_net_exit(struct net *net)
 196 {
 197         struct ctl_table *tbl;
 198
 199         tbl = net->core.sysctl_hdr->ctl_table_arg;
 200         unregister_net_sysctl_table(net->core.sysctl_hdr);
 201         BUG_ON(tbl == net_core_table);
 202         kfree(tbl);
 203 }
 204
 205 static __net_initdata struct pernet_operations sysctl_core_ops = {
 206         .init = sysctl_core_net_init,
 207         .exit = sysctl_core_net_exit,
 208 };
 209
 210 static __init int sysctl_core_init(void)
 211 {
 212         return register_pernet_subsys(&sysctl_core_ops);
 213 }
 214
 215 __initcall(sysctl_core_init);