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 1.40 1999/09/07 02:31:17 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 ip_masq.c */
  45 extern int sysctl_ip_masq_debug;
  46
  47 extern int sysctl_tcp_timestamps;
  48 extern int sysctl_tcp_window_scaling;
  49 extern int sysctl_tcp_sack;
  50 extern int sysctl_tcp_retrans_collapse;
  51 extern int sysctl_tcp_keepalive_time;
  52 extern int sysctl_tcp_keepalive_probes;
  53 extern int sysctl_tcp_retries1;
  54 extern int sysctl_tcp_retries2;
  55 extern int sysctl_tcp_fin_timeout;
  56 extern int sysctl_tcp_syncookies;
  57 extern int sysctl_tcp_syn_retries;
  58 extern int sysctl_tcp_stdurg;
  59 extern int sysctl_tcp_rfc1337;
  60 extern int sysctl_tcp_syn_taildrop;
  61 extern int sysctl_max_syn_backlog;
  62 extern int sysctl_tcp_tw_recycle;
  63
  64 /* From icmp.c */
  65 extern int sysctl_icmp_destunreach_time;
  66 extern int sysctl_icmp_timeexceed_time;
  67 extern int sysctl_icmp_paramprob_time;
  68 extern int sysctl_icmp_echoreply_time;
  69
  70 /* From igmp.c */
  71 extern int sysctl_igmp_max_memberships;
  72
  73 int tcp_retr1_max = 255;
  74
  75 struct ipv4_config ipv4_config;
  76
  77 extern ctl_table ipv4_route_table[];
  78
  79 #ifdef CONFIG_SYSCTL
  80
  81 static
  82 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
  83                         void *buffer, size_t *lenp)
  84 {
  85         int val = ipv4_devconf.forwarding;
  86         int ret;
  87
  88         ret = proc_dointvec(ctl, write, filp, buffer, lenp);
  89
  90         if (write && ipv4_devconf.forwarding != val)
  91                 inet_forward_change();
  92
  93         return ret;
  94 }
  95
  96 static int ipv4_sysctl_forward_strategy(ctl_table *table, int *name, int nlen,
  97                          void *oldval, size_t *oldlenp,
  98                          void *newval, size_t newlen,
  99                          void **context)
 100 {
 101         int new;
 102         if (newlen != sizeof(int))
 103                 return -EINVAL;
 104         if (get_user(new,(int *)newval))
 105                 return -EFAULT;
 106         if (new != ipv4_devconf.forwarding)
 107                 inet_forward_change();
 108         return 0; /* caller does change again and handles handles oldval */
 109 }
 110
 111 ctl_table ipv4_table[] = {
 112         {NET_IPV4_TCP_TIMESTAMPS, "tcp_timestamps",
 113          &sysctl_tcp_timestamps, sizeof(int), 0644, NULL,
 114          &proc_dointvec},
 115         {NET_IPV4_TCP_WINDOW_SCALING, "tcp_window_scaling",
 116          &sysctl_tcp_window_scaling, sizeof(int), 0644, NULL,
 117          &proc_dointvec},
 118         {NET_IPV4_TCP_SACK, "tcp_sack",
 119          &sysctl_tcp_sack, sizeof(int), 0644, NULL,
 120          &proc_dointvec},
 121         {NET_IPV4_TCP_RETRANS_COLLAPSE, "tcp_retrans_collapse",
 122          &sysctl_tcp_retrans_collapse, sizeof(int), 0644, NULL,
 123          &proc_dointvec},
 124         {NET_IPV4_FORWARD, "ip_forward",
 125          &ipv4_devconf.forwarding, sizeof(int), 0644, NULL,
 126          &ipv4_sysctl_forward,&ipv4_sysctl_forward_strategy},
 127         {NET_IPV4_DEFAULT_TTL, "ip_default_ttl",
 128          &ip_statistics.IpDefaultTTL, sizeof(int), 0644, NULL,
 129          &proc_dointvec},
 130         {NET_IPV4_AUTOCONFIG, "ip_autoconfig",
 131          &ipv4_config.autoconfig, sizeof(int), 0644, NULL,
 132          &proc_dointvec},
 133         {NET_IPV4_NO_PMTU_DISC, "ip_no_pmtu_disc",
 134          &ipv4_config.no_pmtu_disc, sizeof(int), 0644, NULL,
 135          &proc_dointvec},
 136         {NET_IPV4_TCP_SYN_RETRIES, "tcp_syn_retries",
 137          &sysctl_tcp_syn_retries, sizeof(int), 0644, NULL, &proc_dointvec},
 138         {NET_IPV4_IPFRAG_HIGH_THRESH, "ipfrag_high_thresh",
 139          &sysctl_ipfrag_high_thresh, sizeof(int), 0644, NULL, &proc_dointvec},
 140         {NET_IPV4_IPFRAG_LOW_THRESH, "ipfrag_low_thresh",
 141          &sysctl_ipfrag_low_thresh, sizeof(int), 0644, NULL, &proc_dointvec},
 142         {NET_IPV4_DYNADDR, "ip_dynaddr",
 143          &sysctl_ip_dynaddr, sizeof(int), 0644, NULL, &proc_dointvec},
 144         {NET_IPV4_IPFRAG_TIME, "ipfrag_time",
 145          &sysctl_ipfrag_time, sizeof(int), 0644, NULL, &proc_dointvec_jiffies,
 146          &sysctl_jiffies},
 147         {NET_IPV4_TCP_KEEPALIVE_TIME, "tcp_keepalive_time",
 148          &sysctl_tcp_keepalive_time, sizeof(int), 0644, NULL,
 149          &proc_dointvec_jiffies, &sysctl_jiffies},
 150         {NET_IPV4_TCP_KEEPALIVE_PROBES, "tcp_keepalive_probes",
 151          &sysctl_tcp_keepalive_probes, sizeof(int), 0644, NULL,
 152          &proc_dointvec},
 153         {NET_IPV4_TCP_KEEPALIVE_INTVL, "tcp_keepalive_intvl",
 154          &sysctl_tcp_keepalive_intvl, sizeof(int), 0644, NULL,
 155          &proc_dointvec_jiffies, &sysctl_jiffies},
 156         {NET_IPV4_TCP_RETRIES1, "tcp_retries1",
 157          &sysctl_tcp_retries1, sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 158          &sysctl_intvec, NULL, NULL, &tcp_retr1_max},
 159         {NET_IPV4_TCP_RETRIES2, "tcp_retries2",
 160          &sysctl_tcp_retries2, sizeof(int), 0644, NULL, &proc_dointvec},
 161         {NET_IPV4_TCP_FIN_TIMEOUT, "tcp_fin_timeout",
 162          &sysctl_tcp_fin_timeout, sizeof(int), 0644, NULL,
 163          &proc_dointvec_jiffies, &sysctl_jiffies},
 164 #ifdef CONFIG_SYN_COOKIES
 165         {NET_TCP_SYNCOOKIES, "tcp_syncookies",
 166          &sysctl_tcp_syncookies, sizeof(int), 0644, NULL, &proc_dointvec},
 167 #endif
 168 #ifdef CONFIG_TCP_TW_RECYCLE
 169         {NET_TCP_TW_RECYCLE, "tcp_tw_recycle",
 170          &sysctl_tcp_tw_recycle, sizeof(int), 0644, NULL, &proc_dointvec},
 171 #endif
 172         {NET_TCP_STDURG, "tcp_stdurg", &sysctl_tcp_stdurg,
 173          sizeof(int), 0644, NULL, &proc_dointvec},
 174         {NET_TCP_RFC1337, "tcp_rfc1337", &sysctl_tcp_rfc1337,
 175          sizeof(int), 0644, NULL, &proc_dointvec},
 176         {NET_TCP_MAX_SYN_BACKLOG, "tcp_max_syn_backlog", &sysctl_max_syn_backlog,
 177          sizeof(int), 0644, NULL, &proc_dointvec},
 178         {NET_IPV4_LOCAL_PORT_RANGE, "ip_local_port_range",
 179          &sysctl_local_port_range, sizeof(sysctl_local_port_range), 0644,
 180          NULL, &proc_dointvec},
 181         {NET_IPV4_ICMP_ECHO_IGNORE_ALL, "icmp_echo_ignore_all",
 182          &sysctl_icmp_echo_ignore_all, sizeof(int), 0644, NULL,
 183          &proc_dointvec},
 184         {NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS, "icmp_echo_ignore_broadcasts",
 185          &sysctl_icmp_echo_ignore_broadcasts, sizeof(int), 0644, NULL,
 186          &proc_dointvec},
 187         {NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES, "icmp_ignore_bogus_error_responses",
 188          &sysctl_icmp_ignore_bogus_error_responses, sizeof(int), 0644, NULL,
 189          &proc_dointvec},
 190         {NET_IPV4_ICMP_DESTUNREACH_RATE, "icmp_destunreach_rate",
 191          &sysctl_icmp_destunreach_time, sizeof(int), 0644, NULL, &proc_dointvec},
 192         {NET_IPV4_ICMP_TIMEEXCEED_RATE, "icmp_timeexceed_rate",
 193          &sysctl_icmp_timeexceed_time, sizeof(int), 0644, NULL, &proc_dointvec},
 194         {NET_IPV4_ICMP_PARAMPROB_RATE, "icmp_paramprob_rate",
 195          &sysctl_icmp_paramprob_time, sizeof(int), 0644, NULL, &proc_dointvec},
 196         {NET_IPV4_ICMP_ECHOREPLY_RATE, "icmp_echoreply_rate",
 197          &sysctl_icmp_echoreply_time, sizeof(int), 0644, NULL, &proc_dointvec},
 198         {NET_IPV4_ROUTE, "route", NULL, 0, 0555, ipv4_route_table},
 199 #ifdef CONFIG_IP_MULTICAST
 200         {NET_IPV4_IGMP_MAX_MEMBERSHIPS, "igmp_max_memberships",
 201          &sysctl_igmp_max_memberships, sizeof(int), 0644, NULL, &proc_dointvec},
 202 #endif
 203         {0}
 204 };
 205
 206 #endif /* CONFIG_SYSCTL */