net/xfrm/xfrm_sysctl.c

   1 #include <linux/sysctl.h>
   2 #include <linux/slab.h>
   3 #include <net/net_namespace.h>
   4 #include <net/xfrm.h>
   5
   6 static void __net_init __xfrm_sysctl_init(struct net *net)
   7 {
   8         net->xfrm.sysctl_aevent_etime = XFRM_AE_ETIME;
   9         net->xfrm.sysctl_aevent_rseqth = XFRM_AE_SEQT_SIZE;
  10         net->xfrm.sysctl_larval_drop = 1;
  11         net->xfrm.sysctl_acq_expires = 30;
  12 }
  13
  14 #ifdef CONFIG_SYSCTL
  15 static struct ctl_table xfrm_table[] = {
  16         {
  17                 .procname       = "xfrm_aevent_etime",
  18                 .maxlen         = sizeof(u32),
  19                 .mode           = 0644,
  20                 .proc_handler   = proc_dointvec
  21         },
  22         {
  23                 .procname       = "xfrm_aevent_rseqth",
  24                 .maxlen         = sizeof(u32),
  25                 .mode           = 0644,
  26                 .proc_handler   = proc_dointvec
  27         },
  28         {
  29                 .procname       = "xfrm_larval_drop",
  30                 .maxlen         = sizeof(int),
  31                 .mode           = 0644,
  32                 .proc_handler   = proc_dointvec
  33         },
  34         {
  35                 .procname       = "xfrm_acq_expires",
  36                 .maxlen         = sizeof(int),
  37                 .mode           = 0644,
  38                 .proc_handler   = proc_dointvec
  39         },
  40         {}
  41 };
  42
  43 int __net_init xfrm_sysctl_init(struct net *net)
  44 {
  45         struct ctl_table *table;
  46
  47         __xfrm_sysctl_init(net);
  48
  49         table = kmemdup(xfrm_table, sizeof(xfrm_table), GFP_KERNEL);
  50         if (!table)
  51                 goto out_kmemdup;
  52         table[0].data = &net->xfrm.sysctl_aevent_etime;
  53         table[1].data = &net->xfrm.sysctl_aevent_rseqth;
  54         table[2].data = &net->xfrm.sysctl_larval_drop;
  55         table[3].data = &net->xfrm.sysctl_acq_expires;
  56
  57         /* Don't export sysctls to unprivileged users */
  58         if (net->user_ns != &init_user_ns)
  59                 table[0].procname = NULL;
  60
  61         net->xfrm.sysctl_hdr = register_net_sysctl(net, "net/core", table);
  62         if (!net->xfrm.sysctl_hdr)
  63                 goto out_register;
  64         return 0;
  65
  66 out_register:
  67         kfree(table);
  68 out_kmemdup:
  69         return -ENOMEM;
  70 }
  71
  72 void __net_exit xfrm_sysctl_fini(struct net *net)
  73 {
  74         struct ctl_table *table;
  75
  76         table = net->xfrm.sysctl_hdr->ctl_table_arg;
  77         unregister_net_sysctl_table(net->xfrm.sysctl_hdr);
  78         kfree(table);
  79 }
  80 #else
  81 int __net_init xfrm_sysctl_init(struct net *net)
  82 {
  83         __xfrm_sysctl_init(net);
  84         return 0;
  85 }
  86 #endif