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   1 /*
   2  * linux/net/sunrpc/sysctl.c
   3  *
   4  * Sysctl interface to sunrpc module.
   5  *
   6  * I would prefer to register the sunrpc table below sys/net, but that's
   7  * impossible at the moment.
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/linkage.h>
  12 #include <linux/ctype.h>
  13 #include <linux/fs.h>
  14 #include <linux/sysctl.h>
  15 #include <linux/module.h>
  16
  17 #include <asm/uaccess.h>
  18 #include <linux/sunrpc/types.h>
  19 #include <linux/sunrpc/sched.h>
  20 #include <linux/sunrpc/stats.h>
  21 #include <linux/sunrpc/xprt.h>
  22
  23 /*
  24  * Declare the debug flags here
  25  */
  26 unsigned int    rpc_debug;
  27 unsigned int    nfs_debug;
  28 unsigned int    nfsd_debug;
  29 unsigned int    nlm_debug;
  30
  31 #ifdef RPC_DEBUG
  32
  33 static struct ctl_table_header *sunrpc_table_header;
  34 static ctl_table                sunrpc_table[];
  35
  36 void
  37 rpc_register_sysctl(void)
  38 {
  39         if (!sunrpc_table_header) {
  40                 sunrpc_table_header = register_sysctl_table(sunrpc_table, 1);
  41 #ifdef CONFIG_PROC_FS
  42                 if (sunrpc_table[0].de)
  43                         sunrpc_table[0].de->owner = THIS_MODULE;
  44 #endif
  45         }
  46
  47 }
  48
  49 void
  50 rpc_unregister_sysctl(void)
  51 {
  52         if (sunrpc_table_header) {
  53                 unregister_sysctl_table(sunrpc_table_header);
  54                 sunrpc_table_header = NULL;
  55         }
  56 }
  57
  58 static int
  59 proc_dodebug(ctl_table *table, int write, struct file *file,
  60                                 void __user *buffer, size_t *lenp, loff_t *ppos)
  61 {
  62         char            tmpbuf[20], c, *s;
  63         char __user *p;
  64         unsigned int    value;
  65         size_t          left, len;
  66
  67         if ((*ppos && !write) || !*lenp) {
  68                 *lenp = 0;
  69                 return 0;
  70         }
  71
  72         left = *lenp;
  73
  74         if (write) {
  75                 if (!access_ok(VERIFY_READ, buffer, left))
  76                         return -EFAULT;
  77                 p = buffer;
  78                 while (left && __get_user(c, p) >= 0 && isspace(c))
  79                         left--, p++;
  80                 if (!left)
  81                         goto done;
  82
  83                 if (left > sizeof(tmpbuf) - 1)
  84                         return -EINVAL;
  85                 if (copy_from_user(tmpbuf, p, left))
  86                         return -EFAULT;
  87                 tmpbuf[left] = '\0';
  88
  89                 for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)
  90                         value = 10 * value + (*s - '0');
  91                 if (*s && !isspace(*s))
  92                         return -EINVAL;
  93                 while (left && isspace(*s))
  94                         left--, s++;
  95                 *(unsigned int *) table->data = value;
  96                 /* Display the RPC tasks on writing to rpc_debug */
  97                 if (table->ctl_name == CTL_RPCDEBUG) {
  98                         rpc_show_tasks();
  99                 }
 100         } else {
 101                 if (!access_ok(VERIFY_WRITE, buffer, left))
 102                         return -EFAULT;
 103                 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
 104                 if (len > left)
 105                         len = left;
 106                 if (__copy_to_user(buffer, tmpbuf, len))
 107                         return -EFAULT;
 108                 if ((left -= len) > 0) {
 109                         if (put_user('\n', (char __user *)buffer + len))
 110                                 return -EFAULT;
 111                         left--;
 112                 }
 113         }
 114
 115 done:
 116         *lenp -= left;
 117         *ppos += *lenp;
 118         return 0;
 119 }
 120
 121
 122 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
 123 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
 124 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
 125 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
 126
 127 static ctl_table debug_table[] = {
 128         {
 129                 .ctl_name       = CTL_RPCDEBUG,
 130                 .procname       = "rpc_debug",
 131                 .data           = &rpc_debug,
 132                 .maxlen         = sizeof(int),
 133                 .mode           = 0644,
 134                 .proc_handler   = &proc_dodebug
 135         },
 136         {
 137                 .ctl_name       = CTL_NFSDEBUG,
 138                 .procname       = "nfs_debug",
 139                 .data           = &nfs_debug,
 140                 .maxlen         = sizeof(int),
 141                 .mode           = 0644,
 142                 .proc_handler   = &proc_dodebug
 143         },
 144         {
 145                 .ctl_name       = CTL_NFSDDEBUG,
 146                 .procname       = "nfsd_debug",
 147                 .data           = &nfsd_debug,
 148                 .maxlen         = sizeof(int),
 149                 .mode           = 0644,
 150                 .proc_handler   = &proc_dodebug
 151         },
 152         {
 153                 .ctl_name       = CTL_NLMDEBUG,
 154                 .procname       = "nlm_debug",
 155                 .data           = &nlm_debug,
 156                 .maxlen         = sizeof(int),
 157                 .mode           = 0644,
 158                 .proc_handler   = &proc_dodebug
 159         },
 160         {
 161                 .ctl_name       = CTL_SLOTTABLE_UDP,
 162                 .procname       = "udp_slot_table_entries",
 163                 .data           = &xprt_udp_slot_table_entries,
 164                 .maxlen         = sizeof(unsigned int),
 165                 .mode           = 0644,
 166                 .proc_handler   = &proc_dointvec_minmax,
 167                 .strategy       = &sysctl_intvec,
 168                 .extra1         = &min_slot_table_size,
 169                 .extra2         = &max_slot_table_size
 170         },
 171         {
 172                 .ctl_name       = CTL_SLOTTABLE_TCP,
 173                 .procname       = "tcp_slot_table_entries",
 174                 .data           = &xprt_tcp_slot_table_entries,
 175                 .maxlen         = sizeof(unsigned int),
 176                 .mode           = 0644,
 177                 .proc_handler   = &proc_dointvec_minmax,
 178                 .strategy       = &sysctl_intvec,
 179                 .extra1         = &min_slot_table_size,
 180                 .extra2         = &max_slot_table_size
 181         },
 182         {
 183                 .ctl_name       = CTL_MIN_RESVPORT,
 184                 .procname       = "min_resvport",
 185                 .data           = &xprt_min_resvport,
 186                 .maxlen         = sizeof(unsigned int),
 187                 .mode           = 0644,
 188                 .proc_handler   = &proc_dointvec_minmax,
 189                 .strategy       = &sysctl_intvec,
 190                 .extra1         = &xprt_min_resvport_limit,
 191                 .extra2         = &xprt_max_resvport_limit
 192         },
 193         {
 194                 .ctl_name       = CTL_MAX_RESVPORT,
 195                 .procname       = "max_resvport",
 196                 .data           = &xprt_max_resvport,
 197                 .maxlen         = sizeof(unsigned int),
 198                 .mode           = 0644,
 199                 .proc_handler   = &proc_dointvec_minmax,
 200                 .strategy       = &sysctl_intvec,
 201                 .extra1         = &xprt_min_resvport_limit,
 202                 .extra2         = &xprt_max_resvport_limit
 203         },
 204         { .ctl_name = 0 }
 205 };
 206
 207 static ctl_table sunrpc_table[] = {
 208         {
 209                 .ctl_name       = CTL_SUNRPC,
 210                 .procname       = "sunrpc",
 211                 .mode           = 0555,
 212                 .child          = debug_table
 213         },
 214         { .ctl_name = 0 }
 215 };
 216
 217 #endif