release/src/linux/linux/net/ipv4/sysctl_net_ipv4.c

   1 /*
   2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   3  *
   4  * $Id: sysctl_net_ipv4.c,v 1.1.1.4 2003/10/14 08:09:33 sparq Exp $
   5  *
   6  * Begun April 1, 1996, Mike Shaver.
   7  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   8  */
   9
  10 #include <linux/mm.h>
  11 #include <linux/sysctl.h>
  12 #include <linux/config.h>
  13 #include <net/snmp.h>
  14 #include <net/ip.h>
  15 #include <net/route.h>
  16 #include <net/tcp.h>
  17
  18 /* From af_inet.c */
  19 extern int sysctl_ip_nonlocal_bind;
  20
  21 /* From icmp.c */
  22 extern int sysctl_icmp_echo_ignore_all;
  23 extern int sysctl_icmp_echo_ignore_broadcasts;
  24 extern int sysctl_icmp_ignore_bogus_error_responses;
  25
  26 /* From ip_fragment.c */
  27 extern int sysctl_ipfrag_low_thresh;
  28 extern int sysctl_ipfrag_high_thresh;
  29 extern int sysctl_ipfrag_time;
  30
  31 /* From ip_output.c */
  32 extern int sysctl_ip_dynaddr;
  33
  34 /* From icmp.c */
  35 extern int sysctl_icmp_ratelimit;
  36 extern int sysctl_icmp_ratemask;
  37
  38 /* From igmp.c */
  39 extern int sysctl_igmp_max_memberships;
  40
  41 /* From inetpeer.c */
  42 extern int inet_peer_threshold;
  43 extern int inet_peer_minttl;
  44 extern int inet_peer_maxttl;
  45 extern int inet_peer_gc_mintime;
  46 extern int inet_peer_gc_maxtime;
  47
  48 #ifdef CONFIG_SYSCTL
  49 static int tcp_retr1_max = 255;
  50 static int ip_local_port_range_min[] = { 1, 1 };
  51 static int ip_local_port_range_max[] = { 65535, 65535 };
  52 #endif
  53
  54 struct ipv4_config ipv4_config;
  55
  56 extern ctl_table ipv4_route_table[];
  57
  58 #ifdef CONFIG_SYSCTL
  59
  60 static
  61 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
  62                         void *buffer, size_t *lenp)
  63 {
  64         int val = ipv4_devconf.forwarding;
  65         int ret;
  66
  67         ret = proc_dointvec(ctl, write, filp, buffer, lenp);
  68
  69         if (write && ipv4_devconf.forwarding != val)
  70                 inet_forward_change();
  71
  72         return ret;
  73 }
  74
  75 static int ipv4_sysctl_forward_strategy(ctl_table *table, int *name, int nlen,
  76                          void *oldval, size_t *oldlenp,
  77                          void *newval, size_t newlen,
  78                          void **context)
  79 {
  80         int new;
  81         if (newlen != sizeof(int))
  82                 return -EINVAL;
  83         if (get_user(new,(int *)newval))
  84                 return -EFAULT;
  85         if (new != ipv4_devconf.forwarding)
  86                 inet_forward_change();
  87         return 0; /* caller does change again and handles handles oldval */
  88 }
  89
  90 ctl_table ipv4_table[] = {
  91         {NET_IPV4_TCP_TIMESTAMPS, "tcp_timestamps",
  92          &sysctl_tcp_timestamps, sizeof(int), 0644, NULL,
  93          &proc_dointvec},
  94         {NET_IPV4_TCP_WINDOW_SCALING, "tcp_window_scaling",
  95          &sysctl_tcp_window_scaling, sizeof(int), 0644, NULL,
  96          &proc_dointvec},
  97         {NET_IPV4_TCP_SACK, "tcp_sack",
  98          &sysctl_tcp_sack, sizeof(int), 0644, NULL,
  99          &proc_dointvec},
 100         {NET_IPV4_TCP_RETRANS_COLLAPSE, "tcp_retrans_collapse",
 101          &sysctl_tcp_retrans_collapse, sizeof(int), 0644, NULL,
 102          &proc_dointvec},
 103         {NET_IPV4_FORWARD, "ip_forward",
 104          &ipv4_devconf.forwarding, sizeof(int), 0644, NULL,
 105          &ipv4_sysctl_forward,&ipv4_sysctl_forward_strategy},
 106         {NET_IPV4_DEFAULT_TTL, "ip_default_ttl",
 107          &sysctl_ip_default_ttl, sizeof(int), 0644, NULL,
 108          &proc_dointvec},
 109         {NET_IPV4_AUTOCONFIG, "ip_autoconfig",
 110          &ipv4_config.autoconfig, sizeof(int), 0644, NULL,
 111          &proc_dointvec},
 112         {NET_IPV4_NO_PMTU_DISC, "ip_no_pmtu_disc",
 113          &ipv4_config.no_pmtu_disc, sizeof(int), 0644, NULL,
 114          &proc_dointvec},
 115         {NET_IPV4_NONLOCAL_BIND, "ip_nonlocal_bind",
 116          &sysctl_ip_nonlocal_bind, sizeof(int), 0644, NULL,
 117          &proc_dointvec},
 118         {NET_IPV4_TCP_SYN_RETRIES, "tcp_syn_retries",
 119          &sysctl_tcp_syn_retries, sizeof(int), 0644, NULL, &proc_dointvec},
 120         {NET_TCP_SYNACK_RETRIES, "tcp_synack_retries",
 121          &sysctl_tcp_synack_retries, sizeof(int), 0644, NULL, &proc_dointvec},
 122         {NET_TCP_MAX_ORPHANS, "tcp_max_orphans",
 123          &sysctl_tcp_max_orphans, sizeof(int), 0644, NULL, &proc_dointvec},
 124         {NET_TCP_MAX_TW_BUCKETS, "tcp_max_tw_buckets",
 125          &sysctl_tcp_max_tw_buckets, sizeof(int), 0644, NULL, &proc_dointvec},
 126         {NET_IPV4_IPFRAG_HIGH_THRESH, "ipfrag_high_thresh",
 127          &sysctl_ipfrag_high_thresh, sizeof(int), 0644, NULL, &proc_dointvec},
 128         {NET_IPV4_IPFRAG_LOW_THRESH, "ipfrag_low_thresh",
 129          &sysctl_ipfrag_low_thresh, sizeof(int), 0644, NULL, &proc_dointvec},
 130         {NET_IPV4_DYNADDR, "ip_dynaddr",
 131          &sysctl_ip_dynaddr, sizeof(int), 0644, NULL, &proc_dointvec},
 132         {NET_IPV4_IPFRAG_TIME, "ipfrag_time",
 133          &sysctl_ipfrag_time, sizeof(int), 0644, NULL, &proc_dointvec_jiffies,
 134          &sysctl_jiffies},
 135         {NET_IPV4_TCP_KEEPALIVE_TIME, "tcp_keepalive_time",
 136          &sysctl_tcp_keepalive_time, sizeof(int), 0644, NULL,
 137          &proc_dointvec_jiffies, &sysctl_jiffies},
 138         {NET_IPV4_TCP_KEEPALIVE_PROBES, "tcp_keepalive_probes",
 139          &sysctl_tcp_keepalive_probes, sizeof(int), 0644, NULL,
 140          &proc_dointvec},
 141         {NET_IPV4_TCP_KEEPALIVE_INTVL, "tcp_keepalive_intvl",
 142          &sysctl_tcp_keepalive_intvl, sizeof(int), 0644, NULL,
 143          &proc_dointvec_jiffies, &sysctl_jiffies},
 144         {NET_IPV4_TCP_RETRIES1, "tcp_retries1",
 145          &sysctl_tcp_retries1, sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 146          &sysctl_intvec, NULL, NULL, &tcp_retr1_max},
 147         {NET_IPV4_TCP_RETRIES2, "tcp_retries2",
 148          &sysctl_tcp_retries2, sizeof(int), 0644, NULL, &proc_dointvec},
 149         {NET_IPV4_TCP_FIN_TIMEOUT, "tcp_fin_timeout",
 150          &sysctl_tcp_fin_timeout, sizeof(int), 0644, NULL,
 151          &proc_dointvec_jiffies, &sysctl_jiffies},
 152 #ifdef CONFIG_SYN_COOKIES
 153         {NET_TCP_SYNCOOKIES, "tcp_syncookies",
 154          &sysctl_tcp_syncookies, sizeof(int), 0644, NULL, &proc_dointvec},
 155 #endif
 156         {NET_TCP_TW_RECYCLE, "tcp_tw_recycle",
 157          &sysctl_tcp_tw_recycle, sizeof(int), 0644, NULL, &proc_dointvec},
 158         {NET_TCP_ABORT_ON_OVERFLOW, "tcp_abort_on_overflow",
 159          &sysctl_tcp_abort_on_overflow, sizeof(int), 0644, NULL, &proc_dointvec},
 160         {NET_TCP_STDURG, "tcp_stdurg", &sysctl_tcp_stdurg,
 161          sizeof(int), 0644, NULL, &proc_dointvec},
 162         {NET_TCP_RFC1337, "tcp_rfc1337", &sysctl_tcp_rfc1337,
 163          sizeof(int), 0644, NULL, &proc_dointvec},
 164         {NET_TCP_MAX_SYN_BACKLOG, "tcp_max_syn_backlog", &sysctl_max_syn_backlog,
 165          sizeof(int), 0644, NULL, &proc_dointvec},
 166         {NET_IPV4_LOCAL_PORT_RANGE, "ip_local_port_range",
 167          &sysctl_local_port_range, sizeof(sysctl_local_port_range), 0644,
 168          NULL, &proc_dointvec_minmax, &sysctl_intvec, NULL,
 169          ip_local_port_range_min, ip_local_port_range_max },
 170         {NET_IPV4_ICMP_ECHO_IGNORE_ALL, "icmp_echo_ignore_all",
 171          &sysctl_icmp_echo_ignore_all, sizeof(int), 0644, NULL,
 172          &proc_dointvec},
 173         {NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS, "icmp_echo_ignore_broadcasts",
 174          &sysctl_icmp_echo_ignore_broadcasts, sizeof(int), 0644, NULL,
 175          &proc_dointvec},
 176         {NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES, "icmp_ignore_bogus_error_responses",
 177          &sysctl_icmp_ignore_bogus_error_responses, sizeof(int), 0644, NULL,
 178          &proc_dointvec},
 179         {NET_IPV4_ROUTE, "route", NULL, 0, 0555, ipv4_route_table},
 180 #ifdef CONFIG_IP_MULTICAST
 181         {NET_IPV4_IGMP_MAX_MEMBERSHIPS, "igmp_max_memberships",
 182          &sysctl_igmp_max_memberships, sizeof(int), 0644, NULL, &proc_dointvec},
 183 #endif
 184         {NET_IPV4_INET_PEER_THRESHOLD, "inet_peer_threshold",
 185          &inet_peer_threshold, sizeof(int), 0644, NULL, &proc_dointvec},
 186         {NET_IPV4_INET_PEER_MINTTL, "inet_peer_minttl",
 187          &inet_peer_minttl, sizeof(int), 0644, NULL,
 188          &proc_dointvec_jiffies, &sysctl_jiffies},
 189         {NET_IPV4_INET_PEER_MAXTTL, "inet_peer_maxttl",
 190          &inet_peer_maxttl, sizeof(int), 0644, NULL,
 191          &proc_dointvec_jiffies, &sysctl_jiffies},
 192         {NET_IPV4_INET_PEER_GC_MINTIME, "inet_peer_gc_mintime",
 193          &inet_peer_gc_mintime, sizeof(int), 0644, NULL,
 194          &proc_dointvec_jiffies, &sysctl_jiffies},
 195         {NET_IPV4_INET_PEER_GC_MAXTIME, "inet_peer_gc_maxtime",
 196          &inet_peer_gc_maxtime, sizeof(int), 0644, NULL,
 197          &proc_dointvec_jiffies, &sysctl_jiffies},
 198         {NET_TCP_ORPHAN_RETRIES, "tcp_orphan_retries",
 199          &sysctl_tcp_orphan_retries, sizeof(int), 0644, NULL, &proc_dointvec},
 200         {NET_TCP_FACK, "tcp_fack",
 201          &sysctl_tcp_fack, sizeof(int), 0644, NULL, &proc_dointvec},
 202         {NET_TCP_REORDERING, "tcp_reordering",
 203          &sysctl_tcp_reordering, sizeof(int), 0644, NULL, &proc_dointvec},
 204         {NET_TCP_ECN, "tcp_ecn",
 205          &sysctl_tcp_ecn, sizeof(int), 0644, NULL, &proc_dointvec},
 206         {NET_TCP_DSACK, "tcp_dsack",
 207          &sysctl_tcp_dsack, sizeof(int), 0644, NULL, &proc_dointvec},
 208         {NET_TCP_MEM, "tcp_mem",
 209          &sysctl_tcp_mem, sizeof(sysctl_tcp_mem), 0644, NULL, &proc_dointvec},
 210         {NET_TCP_WMEM, "tcp_wmem",
 211          &sysctl_tcp_wmem, sizeof(sysctl_tcp_wmem), 0644, NULL, &proc_dointvec},
 212         {NET_TCP_RMEM, "tcp_rmem",
 213          &sysctl_tcp_rmem, sizeof(sysctl_tcp_rmem), 0644, NULL, &proc_dointvec},
 214         {NET_TCP_APP_WIN, "tcp_app_win",
 215          &sysctl_tcp_app_win, sizeof(int), 0644, NULL, &proc_dointvec},
 216         {NET_TCP_ADV_WIN_SCALE, "tcp_adv_win_scale",
 217          &sysctl_tcp_adv_win_scale, sizeof(int), 0644, NULL, &proc_dointvec},
 218         {NET_IPV4_ICMP_RATELIMIT, "icmp_ratelimit",
 219          &sysctl_icmp_ratelimit, sizeof(int), 0644, NULL, &proc_dointvec},
 220         {NET_IPV4_ICMP_RATEMASK, "icmp_ratemask",
 221          &sysctl_icmp_ratemask, sizeof(int), 0644, NULL, &proc_dointvec},
 222         {NET_TCP_TW_REUSE, "tcp_tw_reuse",
 223          &sysctl_tcp_tw_reuse, sizeof(int), 0644, NULL, &proc_dointvec},
 224         {NET_TCP_VEGAS, "tcp_vegas_cong_avoid",
 225          &sysctl_tcp_vegas_cong_avoid, sizeof(int), 0644, NULL,
 226          &proc_dointvec},
 227         {NET_TCP_VEGAS_ALPHA, "tcp_vegas_alpha",
 228          &sysctl_tcp_vegas_alpha, sizeof(int), 0644, NULL,
 229          &proc_dointvec},
 230         {NET_TCP_VEGAS_BETA, "tcp_vegas_beta",
 231          &sysctl_tcp_vegas_beta, sizeof(int), 0644, NULL,
 232          &proc_dointvec},
 233         {NET_TCP_VEGAS_GAMMA, "tcp_vegas_gamma",
 234          &sysctl_tcp_vegas_gamma, sizeof(int), 0644, NULL,
 235          &proc_dointvec},
 236         {0}
 237 };
 238
 239 #endif /* CONFIG_SYSCTL */