net/llc/sysctl_net_llc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysctl_net_llc.c: sysctl interface to LLC net subsystem.
   4  *
   5  * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   6  */
   7
   8 #include <linux/mm.h>
   9 #include <linux/init.h>
  10 #include <linux/sysctl.h>
  11 #include <net/net_namespace.h>
  12 #include <net/llc.h>
  13
  14 #ifndef CONFIG_SYSCTL
  15 #error This file should not be compiled without CONFIG_SYSCTL defined
  16 #endif
  17
  18 static struct ctl_table llc2_timeout_table[] = {
  19         {
  20                 .procname       = "ack",
  21                 .data           = &sysctl_llc2_ack_timeout,
  22                 .maxlen         = sizeof(sysctl_llc2_ack_timeout),
  23                 .mode           = 0644,
  24                 .proc_handler   = proc_dointvec_jiffies,
  25         },
  26         {
  27                 .procname       = "busy",
  28                 .data           = &sysctl_llc2_busy_timeout,
  29                 .maxlen         = sizeof(sysctl_llc2_busy_timeout),
  30                 .mode           = 0644,
  31                 .proc_handler   = proc_dointvec_jiffies,
  32         },
  33         {
  34                 .procname       = "p",
  35                 .data           = &sysctl_llc2_p_timeout,
  36                 .maxlen         = sizeof(sysctl_llc2_p_timeout),
  37                 .mode           = 0644,
  38                 .proc_handler   = proc_dointvec_jiffies,
  39         },
  40         {
  41                 .procname       = "rej",
  42                 .data           = &sysctl_llc2_rej_timeout,
  43                 .maxlen         = sizeof(sysctl_llc2_rej_timeout),
  44                 .mode           = 0644,
  45                 .proc_handler   = proc_dointvec_jiffies,
  46         },
  47 };
  48
  49 static struct ctl_table_header *llc2_timeout_header;
  50 static struct ctl_table_header *llc_station_header;
  51
  52 int __init llc_sysctl_init(void)
  53 {
  54         struct ctl_table empty[1] = {};
  55         llc2_timeout_header = register_net_sysctl(&init_net, "net/llc/llc2/timeout", llc2_timeout_table);
  56         llc_station_header = register_net_sysctl_sz(&init_net, "net/llc/station", empty, 0);
  57
  58         if (!llc2_timeout_header || !llc_station_header) {
  59                 llc_sysctl_exit();
  60                 return -ENOMEM;
  61         }
  62         return 0;
  63 }
  64
  65 void llc_sysctl_exit(void)
  66 {
  67         if (llc2_timeout_header) {
  68                 unregister_net_sysctl_table(llc2_timeout_header);
  69                 llc2_timeout_header = NULL;
  70         }
  71         if (llc_station_header) {
  72                 unregister_net_sysctl_table(llc_station_header);
  73                 llc_station_header = NULL;
  74         }
  75 }