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 1.43 2000/01/16 05:11:27 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 /*
  19  *      TCP configuration parameters
  20  */
  21
  22 #define TCP_PMTU_DISC   0x00000001      /* perform PMTU discovery         */
  23 #define TCP_CONG_AVOID  0x00000002      /* congestion avoidance algorithm */
  24 #define TCP_DELAY_ACKS  0x00000003      /* delayed ack stategy            */
  25
  26 #if 0
  27 static int boolean_min = 0;
  28 static int boolean_max = 1;
  29 #endif
  30
  31 /* From icmp.c */
  32 extern int sysctl_icmp_echo_ignore_all;
  33 extern int sysctl_icmp_echo_ignore_broadcasts;
  34 extern int sysctl_icmp_ignore_bogus_error_responses;
  35
  36 /* From ip_fragment.c */
  37 extern int sysctl_ipfrag_low_thresh;
  38 extern int sysctl_ipfrag_high_thresh;
  39 extern int sysctl_ipfrag_time;
  40
  41 /* From ip_output.c */
  42 extern int sysctl_ip_dynaddr;
  43
  44 /* From icmp.c */
  45 extern int sysctl_icmp_destunreach_time;
  46 extern int sysctl_icmp_timeexceed_time;
  47 extern int sysctl_icmp_paramprob_time;
  48 extern int sysctl_icmp_echoreply_time;
  49
  50 /* From igmp.c */
  51 extern int sysctl_igmp_max_memberships;
  52
  53 /* From inetpeer.c */
  54 extern int inet_peer_threshold;
  55 extern int inet_peer_minttl;
  56 extern int inet_peer_maxttl;
  57 extern int inet_peer_gc_mintime;
  58 extern int inet_peer_gc_maxtime;
  59
  60 int tcp_retr1_max = 255;
  61
  62 struct ipv4_config ipv4_config;
  63
  64 extern ctl_table ipv4_route_table[];
  65
  66 #ifdef CONFIG_SYSCTL
  67
  68 static
  69 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
  70                         void *buffer, size_t *lenp)
  71 {
  72         int val = ipv4_devconf.forwarding;
  73         int ret;
  74
  75         ret = proc_dointvec(ctl, write, filp, buffer, lenp);
  76
  77         if (write && ipv4_devconf.forwarding != val)
  78                 inet_forward_change();
  79
  80         return ret;
  81 }
  82
  83 static int ipv4_sysctl_forward_strategy(ctl_table *table, int *name, int nlen,
  84                          void *oldval, size_t *oldlenp,
  85                          void *newval, size_t newlen,
  86                          void **context)
  87 {
  88         int new;
  89         if (newlen != sizeof(int))
  90                 return -EINVAL;
  91         if (get_user(new,(int *)newval))
  92                 return -EFAULT;
  93         if (new != ipv4_devconf.forwarding)
  94                 inet_forward_change();
  95         return 0; /* caller does change again and handles handles oldval */
  96 }
  97
  98 ctl_table ipv4_table[] = {
  99         {NET_IPV4_TCP_TIMESTAMPS, "tcp_timestamps",
 100          &sysctl_tcp_timestamps, sizeof(int), 0644, NULL,
 101          &proc_dointvec},
 102         {NET_IPV4_TCP_WINDOW_SCALING, "tcp_window_scaling",
 103          &sysctl_tcp_window_scaling, sizeof(int), 0644, NULL,
 104          &proc_dointvec},
 105         {NET_IPV4_TCP_SACK, "tcp_sack",
 106          &sysctl_tcp_sack, sizeof(int), 0644, NULL,
 107          &proc_dointvec},
 108         {NET_IPV4_TCP_RETRANS_COLLAPSE, "tcp_retrans_collapse",
 109          &sysctl_tcp_retrans_collapse, sizeof(int), 0644, NULL,
 110          &proc_dointvec},
 111         {NET_IPV4_FORWARD, "ip_forward",
 112          &ipv4_devconf.forwarding, sizeof(int), 0644, NULL,
 113          &ipv4_sysctl_forward,&ipv4_sysctl_forward_strategy},
 114         {NET_IPV4_DEFAULT_TTL, "ip_default_ttl",
 115          &sysctl_ip_default_ttl, sizeof(int), 0644, NULL,
 116          &proc_dointvec},
 117         {NET_IPV4_AUTOCONFIG, "ip_autoconfig",
 118          &ipv4_config.autoconfig, sizeof(int), 0644, NULL,
 119          &proc_dointvec},
 120         {NET_IPV4_NO_PMTU_DISC, "ip_no_pmtu_disc",
 121          &ipv4_config.no_pmtu_disc, 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},
 174         {NET_IPV4_ICMP_ECHO_IGNORE_ALL, "icmp_echo_ignore_all",
 175          &sysctl_icmp_echo_ignore_all, sizeof(int), 0644, NULL,
 176          &proc_dointvec},
 177         {NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS, "icmp_echo_ignore_broadcasts",
 178          &sysctl_icmp_echo_ignore_broadcasts, sizeof(int), 0644, NULL,
 179          &proc_dointvec},
 180         {NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES, "icmp_ignore_bogus_error_responses",
 181          &sysctl_icmp_ignore_bogus_error_responses, sizeof(int), 0644, NULL,
 182          &proc_dointvec},
 183         {NET_IPV4_ICMP_DESTUNREACH_RATE, "icmp_destunreach_rate",
 184          &sysctl_icmp_destunreach_time, sizeof(int), 0644, NULL, &proc_dointvec},
 185         {NET_IPV4_ICMP_TIMEEXCEED_RATE, "icmp_timeexceed_rate",
 186          &sysctl_icmp_timeexceed_time, sizeof(int), 0644, NULL, &proc_dointvec},
 187         {NET_IPV4_ICMP_PARAMPROB_RATE, "icmp_paramprob_rate",
 188          &sysctl_icmp_paramprob_time, sizeof(int), 0644, NULL, &proc_dointvec},
 189         {NET_IPV4_ICMP_ECHOREPLY_RATE, "icmp_echoreply_rate",
 190          &sysctl_icmp_echoreply_time, sizeof(int), 0644, NULL, &proc_dointvec},
 191         {NET_IPV4_ROUTE, "route", NULL, 0, 0555, ipv4_route_table},
 192 #ifdef CONFIG_IP_MULTICAST
 193         {NET_IPV4_IGMP_MAX_MEMBERSHIPS, "igmp_max_memberships",
 194          &sysctl_igmp_max_memberships, sizeof(int), 0644, NULL, &proc_dointvec},
 195 #endif
 196         {NET_IPV4_INET_PEER_THRESHOLD, "inet_peer_threshold",
 197          &inet_peer_threshold, sizeof(int), 0644, NULL, &proc_dointvec},
 198         {NET_IPV4_INET_PEER_MINTTL, "inet_peer_minttl",
 199          &inet_peer_minttl, sizeof(int), 0644, NULL,
 200          &proc_dointvec_jiffies, &sysctl_jiffies},
 201         {NET_IPV4_INET_PEER_MAXTTL, "inet_peer_maxttl",
 202          &inet_peer_maxttl, sizeof(int), 0644, NULL,
 203          &proc_dointvec_jiffies, &sysctl_jiffies},
 204         {NET_IPV4_INET_PEER_GC_MINTIME, "inet_peer_gc_mintime",
 205          &inet_peer_gc_mintime, sizeof(int), 0644, NULL,
 206          &proc_dointvec_jiffies, &sysctl_jiffies},
 207         {NET_IPV4_INET_PEER_GC_MAXTIME, "inet_peer_gc_maxtime",
 208          &inet_peer_gc_maxtime, sizeof(int), 0644, NULL,
 209          &proc_dointvec_jiffies, &sysctl_jiffies},
 210         {NET_TCP_ORPHAN_RETRIES, "tcp_orphan_retries",
 211          &sysctl_tcp_orphan_retries, sizeof(int), 0644, NULL, &proc_dointvec},
 212         {0}
 213 };
 214
 215 #endif /* CONFIG_SYSCTL */