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 1.50 2001/10/20 00:00:11 davem 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 extern int sysctl_ipfrag_secret_interval;
  31
  32 /* From ip_output.c */
  33 extern int sysctl_ip_dynaddr;
  34
  35 /* From icmp.c */
  36 extern int sysctl_icmp_ratelimit;
  37 extern int sysctl_icmp_ratemask;
  38
  39 /* From igmp.c */
  40 extern int sysctl_igmp_max_memberships;
  41 extern int sysctl_igmp_max_msf;
  42
  43 /* From inetpeer.c */
  44 extern int inet_peer_threshold;
  45 extern int inet_peer_minttl;
  46 extern int inet_peer_maxttl;
  47 extern int inet_peer_gc_mintime;
  48 extern int inet_peer_gc_maxtime;
  49
  50 #ifdef CONFIG_SYSCTL
  51 static int tcp_retr1_max = 255;
  52 static int ip_local_port_range_min[] = { 1, 1 };
  53 static int ip_local_port_range_max[] = { 65535, 65535 };
  54 #endif
  55
  56 /* From tcp_input.c */
  57 extern int sysctl_tcp_westwood;
  58
  59 struct ipv4_config ipv4_config;
  60
  61 extern ctl_table ipv4_route_table[];
  62
  63 #ifdef CONFIG_SYSCTL
  64
  65 static
  66 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
  67                         void *buffer, size_t *lenp)
  68 {
  69         int val = ipv4_devconf.forwarding;
  70         int ret;
  71
  72         ret = proc_dointvec(ctl, write, filp, buffer, lenp);
  73
  74         if (write && ipv4_devconf.forwarding != val)
  75                 inet_forward_change(ipv4_devconf.forwarding);
  76
  77         return ret;
  78 }
  79
  80 static int ipv4_sysctl_forward_strategy(ctl_table *table, int *name, int nlen,
  81                          void *oldval, size_t *oldlenp,
  82                          void *newval, size_t newlen,
  83                          void **context)
  84 {
  85         int new;
  86         if (newlen != sizeof(int))
  87                 return -EINVAL;
  88         if (get_user(new,(int *)newval))
  89                 return -EFAULT;
  90         if (new != ipv4_devconf.forwarding)
  91                 inet_forward_change(new);
  92         return 0; /* caller does change again and handles handles oldval */
  93 }
  94
  95 ctl_table ipv4_table[] = {
  96         {NET_IPV4_TCP_TIMESTAMPS, "tcp_timestamps",
  97          &sysctl_tcp_timestamps, sizeof(int), 0644, NULL,
  98          &proc_dointvec},
  99         {NET_IPV4_TCP_WINDOW_SCALING, "tcp_window_scaling",
 100          &sysctl_tcp_window_scaling, sizeof(int), 0644, NULL,
 101          &proc_dointvec},
 102         {NET_IPV4_TCP_SACK, "tcp_sack",
 103          &sysctl_tcp_sack, sizeof(int), 0644, NULL,
 104          &proc_dointvec},
 105         {NET_IPV4_TCP_RETRANS_COLLAPSE, "tcp_retrans_collapse",
 106          &sysctl_tcp_retrans_collapse, sizeof(int), 0644, NULL,
 107          &proc_dointvec},
 108         {NET_IPV4_FORWARD, "ip_forward",
 109          &ipv4_devconf.forwarding, sizeof(int), 0644, NULL,
 110          &ipv4_sysctl_forward,&ipv4_sysctl_forward_strategy},
 111         {NET_IPV4_DEFAULT_TTL, "ip_default_ttl",
 112          &sysctl_ip_default_ttl, sizeof(int), 0644, NULL,
 113          &proc_dointvec},
 114         {NET_IPV4_AUTOCONFIG, "ip_autoconfig",
 115          &ipv4_config.autoconfig, sizeof(int), 0644, NULL,
 116          &proc_dointvec},
 117         {NET_IPV4_NO_PMTU_DISC, "ip_no_pmtu_disc",
 118          &ipv4_config.no_pmtu_disc, sizeof(int), 0644, NULL,
 119          &proc_dointvec},
 120         {NET_IPV4_NONLOCAL_BIND, "ip_nonlocal_bind",
 121          &sysctl_ip_nonlocal_bind, sizeof(int), 0644, NULL,
 122          &proc_dointvec},
 123         {NET_IPV4_TCP_SYN_RETRIES, "tcp_syn_retries",
 124          &sysctl_tcp_syn_retries, sizeof(int), 0644, NULL, &proc_dointvec},
 125         {NET_TCP_SYNACK_RETRIES, "tcp_synack_retries",
 126          &sysctl_tcp_synack_retries, sizeof(int), 0644, NULL, &proc_dointvec},
 127         {NET_TCP_MAX_ORPHANS, "tcp_max_orphans",
 128          &sysctl_tcp_max_orphans, sizeof(int), 0644, NULL, &proc_dointvec},
 129         {NET_TCP_MAX_TW_BUCKETS, "tcp_max_tw_buckets",
 130          &sysctl_tcp_max_tw_buckets, sizeof(int), 0644, NULL, &proc_dointvec},
 131         {NET_IPV4_IPFRAG_HIGH_THRESH, "ipfrag_high_thresh",
 132          &sysctl_ipfrag_high_thresh, sizeof(int), 0644, NULL, &proc_dointvec},
 133         {NET_IPV4_IPFRAG_LOW_THRESH, "ipfrag_low_thresh",
 134          &sysctl_ipfrag_low_thresh, sizeof(int), 0644, NULL, &proc_dointvec},
 135         {NET_IPV4_DYNADDR, "ip_dynaddr",
 136          &sysctl_ip_dynaddr, sizeof(int), 0644, NULL, &proc_dointvec},
 137         {NET_IPV4_IPFRAG_TIME, "ipfrag_time",
 138          &sysctl_ipfrag_time, sizeof(int), 0644, NULL, &proc_dointvec_jiffies,
 139          &sysctl_jiffies},
 140         {NET_IPV4_TCP_KEEPALIVE_TIME, "tcp_keepalive_time",
 141          &sysctl_tcp_keepalive_time, sizeof(int), 0644, NULL,
 142          &proc_dointvec_jiffies, &sysctl_jiffies},
 143         {NET_IPV4_TCP_KEEPALIVE_PROBES, "tcp_keepalive_probes",
 144          &sysctl_tcp_keepalive_probes, sizeof(int), 0644, NULL,
 145          &proc_dointvec},
 146         {NET_IPV4_TCP_KEEPALIVE_INTVL, "tcp_keepalive_intvl",
 147          &sysctl_tcp_keepalive_intvl, sizeof(int), 0644, NULL,
 148          &proc_dointvec_jiffies, &sysctl_jiffies},
 149         {NET_IPV4_TCP_RETRIES1, "tcp_retries1",
 150          &sysctl_tcp_retries1, sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 151          &sysctl_intvec, NULL, NULL, &tcp_retr1_max},
 152         {NET_IPV4_TCP_RETRIES2, "tcp_retries2",
 153          &sysctl_tcp_retries2, sizeof(int), 0644, NULL, &proc_dointvec},
 154         {NET_IPV4_TCP_FIN_TIMEOUT, "tcp_fin_timeout",
 155          &sysctl_tcp_fin_timeout, sizeof(int), 0644, NULL,
 156          &proc_dointvec_jiffies, &sysctl_jiffies},
 157 #ifdef CONFIG_SYN_COOKIES
 158         {NET_TCP_SYNCOOKIES, "tcp_syncookies",
 159          &sysctl_tcp_syncookies, sizeof(int), 0644, NULL, &proc_dointvec},
 160 #endif
 161         {NET_TCP_TW_RECYCLE, "tcp_tw_recycle",
 162          &sysctl_tcp_tw_recycle, sizeof(int), 0644, NULL, &proc_dointvec},
 163         {NET_TCP_ABORT_ON_OVERFLOW, "tcp_abort_on_overflow",
 164          &sysctl_tcp_abort_on_overflow, sizeof(int), 0644, NULL, &proc_dointvec},
 165         {NET_TCP_STDURG, "tcp_stdurg", &sysctl_tcp_stdurg,
 166          sizeof(int), 0644, NULL, &proc_dointvec},
 167         {NET_TCP_RFC1337, "tcp_rfc1337", &sysctl_tcp_rfc1337,
 168          sizeof(int), 0644, NULL, &proc_dointvec},
 169         {NET_TCP_MAX_SYN_BACKLOG, "tcp_max_syn_backlog", &sysctl_max_syn_backlog,
 170          sizeof(int), 0644, NULL, &proc_dointvec},
 171         {NET_IPV4_LOCAL_PORT_RANGE, "ip_local_port_range",
 172          &sysctl_local_port_range, sizeof(sysctl_local_port_range), 0644,
 173          NULL, &proc_dointvec_minmax, &sysctl_intvec, NULL,
 174          ip_local_port_range_min, ip_local_port_range_max },
 175         {NET_IPV4_ICMP_ECHO_IGNORE_ALL, "icmp_echo_ignore_all",
 176          &sysctl_icmp_echo_ignore_all, sizeof(int), 0644, NULL,
 177          &proc_dointvec},
 178         {NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS, "icmp_echo_ignore_broadcasts",
 179          &sysctl_icmp_echo_ignore_broadcasts, sizeof(int), 0644, NULL,
 180          &proc_dointvec},
 181         {NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES, "icmp_ignore_bogus_error_responses",
 182          &sysctl_icmp_ignore_bogus_error_responses, sizeof(int), 0644, NULL,
 183          &proc_dointvec},
 184         {NET_IPV4_ROUTE, "route", NULL, 0, 0555, ipv4_route_table},
 185 #ifdef CONFIG_IP_MULTICAST
 186         {NET_IPV4_IGMP_MAX_MEMBERSHIPS, "igmp_max_memberships",
 187          &sysctl_igmp_max_memberships, sizeof(int), 0644, NULL, &proc_dointvec},
 188 #endif
 189         {NET_IPV4_IGMP_MAX_MSF, "igmp_max_msf",
 190          &sysctl_igmp_max_msf, sizeof(int), 0644, NULL, &proc_dointvec},
 191         {NET_IPV4_INET_PEER_THRESHOLD, "inet_peer_threshold",
 192          &inet_peer_threshold, sizeof(int), 0644, NULL, &proc_dointvec},
 193         {NET_IPV4_INET_PEER_MINTTL, "inet_peer_minttl",
 194          &inet_peer_minttl, sizeof(int), 0644, NULL,
 195          &proc_dointvec_jiffies, &sysctl_jiffies},
 196         {NET_IPV4_INET_PEER_MAXTTL, "inet_peer_maxttl",
 197          &inet_peer_maxttl, sizeof(int), 0644, NULL,
 198          &proc_dointvec_jiffies, &sysctl_jiffies},
 199         {NET_IPV4_INET_PEER_GC_MINTIME, "inet_peer_gc_mintime",
 200          &inet_peer_gc_mintime, sizeof(int), 0644, NULL,
 201          &proc_dointvec_jiffies, &sysctl_jiffies},
 202         {NET_IPV4_INET_PEER_GC_MAXTIME, "inet_peer_gc_maxtime",
 203          &inet_peer_gc_maxtime, sizeof(int), 0644, NULL,
 204          &proc_dointvec_jiffies, &sysctl_jiffies},
 205         {NET_TCP_ORPHAN_RETRIES, "tcp_orphan_retries",
 206          &sysctl_tcp_orphan_retries, sizeof(int), 0644, NULL, &proc_dointvec},
 207         {NET_TCP_FACK, "tcp_fack",
 208          &sysctl_tcp_fack, sizeof(int), 0644, NULL, &proc_dointvec},
 209         {NET_TCP_REORDERING, "tcp_reordering",
 210          &sysctl_tcp_reordering, sizeof(int), 0644, NULL, &proc_dointvec},
 211         {NET_TCP_ECN, "tcp_ecn",
 212          &sysctl_tcp_ecn, sizeof(int), 0644, NULL, &proc_dointvec},
 213         {NET_TCP_DSACK, "tcp_dsack",
 214          &sysctl_tcp_dsack, sizeof(int), 0644, NULL, &proc_dointvec},
 215         {NET_TCP_MEM, "tcp_mem",
 216          &sysctl_tcp_mem, sizeof(sysctl_tcp_mem), 0644, NULL, &proc_dointvec},
 217         {NET_TCP_WMEM, "tcp_wmem",
 218          &sysctl_tcp_wmem, sizeof(sysctl_tcp_wmem), 0644, NULL, &proc_dointvec},
 219         {NET_TCP_RMEM, "tcp_rmem",
 220          &sysctl_tcp_rmem, sizeof(sysctl_tcp_rmem), 0644, NULL, &proc_dointvec},
 221         {NET_TCP_APP_WIN, "tcp_app_win",
 222          &sysctl_tcp_app_win, sizeof(int), 0644, NULL, &proc_dointvec},
 223         {NET_TCP_ADV_WIN_SCALE, "tcp_adv_win_scale",
 224          &sysctl_tcp_adv_win_scale, sizeof(int), 0644, NULL, &proc_dointvec},
 225         {NET_IPV4_ICMP_RATELIMIT, "icmp_ratelimit",
 226          &sysctl_icmp_ratelimit, sizeof(int), 0644, NULL, &proc_dointvec},
 227         {NET_IPV4_ICMP_RATEMASK, "icmp_ratemask",
 228          &sysctl_icmp_ratemask, sizeof(int), 0644, NULL, &proc_dointvec},
 229         {NET_IPV4_IPFRAG_SECRET_INTERVAL, "ipfrag_secret_interval",
 230         &sysctl_ipfrag_secret_interval, sizeof(int), 0644, NULL, &proc_dointvec_jiffies,
 231         &sysctl_jiffies},
 232         {NET_TCP_TW_REUSE, "tcp_tw_reuse",
 233          &sysctl_tcp_tw_reuse, sizeof(int), 0644, NULL, &proc_dointvec},
 234         {NET_TCP_FRTO, "tcp_frto",
 235          &sysctl_tcp_frto, sizeof(int), 0644, NULL, &proc_dointvec},
 236         {NET_TCP_LOW_LATENCY, "tcp_low_latency",
 237          &sysctl_tcp_low_latency, sizeof(int), 0644, NULL, &proc_dointvec},
 238         {NET_IPV4_IPFRAG_SECRET_INTERVAL, "ipfrag_secret_interval",
 239          &sysctl_ipfrag_secret_interval, sizeof(int), 0644, NULL, &proc_dointvec_jiffies,
 240          &sysctl_jiffies},
 241         {NET_TCP_WESTWOOD, "tcp_westwood",
 242          &sysctl_tcp_westwood, sizeof(int), 0644, NULL,
 243          &proc_dointvec},
 244         {NET_TCP_NO_METRICS_SAVE, "tcp_no_metrics_save",
 245          &sysctl_tcp_nometrics_save, sizeof(int), 0644, NULL,
 246          &proc_dointvec},
 247         {NET_TCP_VEGAS, "tcp_vegas_cong_avoid",
 248          &sysctl_tcp_vegas_cong_avoid, sizeof(int), 0644, NULL,
 249          &proc_dointvec},
 250         {NET_TCP_VEGAS_ALPHA, "tcp_vegas_alpha",
 251          &sysctl_tcp_vegas_alpha, sizeof(int), 0644, NULL,
 252          &proc_dointvec},
 253         {NET_TCP_VEGAS_BETA, "tcp_vegas_beta",
 254          &sysctl_tcp_vegas_beta, sizeof(int), 0644, NULL,
 255          &proc_dointvec},
 256         {NET_TCP_VEGAS_GAMMA, "tcp_vegas_gamma",
 257          &sysctl_tcp_vegas_gamma, sizeof(int), 0644, NULL,
 258          &proc_dointvec},
 259         {NET_TCP_BIC, "tcp_bic",
 260          &sysctl_tcp_bic, sizeof(int), 0644, NULL,
 261          &proc_dointvec},
 262         {NET_TCP_BIC_FAST_CONVERGENCE, "tcp_bic_fast_convergence",
 263          &sysctl_tcp_bic_fast_convergence, sizeof(int), 0644, NULL,
 264          &proc_dointvec},
 265         {NET_TCP_BIC_LOW_WINDOW, "tcp_bic_low_window",
 266          &sysctl_tcp_bic_low_window, sizeof(int), 0644, NULL,
 267          &proc_dointvec},
 268         {NET_TCP_DEFAULT_WIN_SCALE, "tcp_default_win_scale",
 269          &sysctl_tcp_default_win_scale, sizeof(int), 0644, NULL,
 270          &proc_dointvec},
 271         {NET_TCP_MODERATE_RCVBUF, "tcp_moderate_rcvbuf",
 272          &sysctl_tcp_moderate_rcvbuf, sizeof(int), 0644, NULL,
 273          &proc_dointvec},
 274         {NET_TCP_BIC_BETA, "tcp_bic_beta",
 275          &sysctl_tcp_bic_beta, sizeof(int), 0644, NULL,
 276          &proc_dointvec},
 277         {0}
 278 };
 279
 280 #endif /* CONFIG_SYSCTL */