mirror of https://gitee.com/openkylin/linux.git
707 lines
16 KiB
C
707 lines
16 KiB
C
/*
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* sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
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*
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* $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
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*
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* Begun April 1, 1996, Mike Shaver.
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* Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
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*/
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/sysctl.h>
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#include <linux/config.h>
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#include <linux/igmp.h>
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#include <linux/inetdevice.h>
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#include <net/snmp.h>
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#include <net/icmp.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <net/tcp.h>
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/* From af_inet.c */
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extern int sysctl_ip_nonlocal_bind;
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#ifdef CONFIG_SYSCTL
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static int zero;
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static int tcp_retr1_max = 255;
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static int ip_local_port_range_min[] = { 1, 1 };
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static int ip_local_port_range_max[] = { 65535, 65535 };
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#endif
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struct ipv4_config ipv4_config;
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#ifdef CONFIG_SYSCTL
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static
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int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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int val = ipv4_devconf.forwarding;
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int ret;
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ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
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if (write && ipv4_devconf.forwarding != val)
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inet_forward_change();
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return ret;
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}
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static int ipv4_sysctl_forward_strategy(ctl_table *table,
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int __user *name, int nlen,
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void __user *oldval, size_t __user *oldlenp,
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void __user *newval, size_t newlen,
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void **context)
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{
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int *valp = table->data;
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int new;
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if (!newval || !newlen)
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return 0;
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if (newlen != sizeof(int))
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return -EINVAL;
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if (get_user(new, (int __user *)newval))
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return -EFAULT;
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if (new == *valp)
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return 0;
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if (oldval && oldlenp) {
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size_t len;
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if (get_user(len, oldlenp))
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return -EFAULT;
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if (len) {
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if (len > table->maxlen)
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len = table->maxlen;
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if (copy_to_user(oldval, valp, len))
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return -EFAULT;
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if (put_user(len, oldlenp))
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return -EFAULT;
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}
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}
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*valp = new;
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inet_forward_change();
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return 1;
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}
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static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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char val[TCP_CA_NAME_MAX];
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ctl_table tbl = {
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.data = val,
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.maxlen = TCP_CA_NAME_MAX,
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};
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int ret;
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tcp_get_default_congestion_control(val);
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ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
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if (write && ret == 0)
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ret = tcp_set_default_congestion_control(val);
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return ret;
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}
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static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
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int nlen, void __user *oldval,
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size_t __user *oldlenp,
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void __user *newval, size_t newlen,
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void **context)
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{
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char val[TCP_CA_NAME_MAX];
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ctl_table tbl = {
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.data = val,
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.maxlen = TCP_CA_NAME_MAX,
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};
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int ret;
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tcp_get_default_congestion_control(val);
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ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
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context);
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if (ret == 0 && newval && newlen)
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ret = tcp_set_default_congestion_control(val);
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return ret;
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}
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ctl_table ipv4_table[] = {
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{
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.ctl_name = NET_IPV4_TCP_TIMESTAMPS,
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.procname = "tcp_timestamps",
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.data = &sysctl_tcp_timestamps,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_TCP_WINDOW_SCALING,
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.procname = "tcp_window_scaling",
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.data = &sysctl_tcp_window_scaling,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_TCP_SACK,
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.procname = "tcp_sack",
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.data = &sysctl_tcp_sack,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_TCP_RETRANS_COLLAPSE,
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.procname = "tcp_retrans_collapse",
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.data = &sysctl_tcp_retrans_collapse,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_FORWARD,
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.procname = "ip_forward",
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.data = &ipv4_devconf.forwarding,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &ipv4_sysctl_forward,
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.strategy = &ipv4_sysctl_forward_strategy
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},
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{
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.ctl_name = NET_IPV4_DEFAULT_TTL,
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.procname = "ip_default_ttl",
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.data = &sysctl_ip_default_ttl,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &ipv4_doint_and_flush,
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.strategy = &ipv4_doint_and_flush_strategy,
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},
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{
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.ctl_name = NET_IPV4_NO_PMTU_DISC,
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.procname = "ip_no_pmtu_disc",
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.data = &ipv4_config.no_pmtu_disc,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_NONLOCAL_BIND,
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.procname = "ip_nonlocal_bind",
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.data = &sysctl_ip_nonlocal_bind,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_TCP_SYN_RETRIES,
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.procname = "tcp_syn_retries",
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.data = &sysctl_tcp_syn_retries,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_TCP_SYNACK_RETRIES,
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.procname = "tcp_synack_retries",
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.data = &sysctl_tcp_synack_retries,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_TCP_MAX_ORPHANS,
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.procname = "tcp_max_orphans",
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.data = &sysctl_tcp_max_orphans,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_TCP_MAX_TW_BUCKETS,
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.procname = "tcp_max_tw_buckets",
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.data = &tcp_death_row.sysctl_max_tw_buckets,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_IPFRAG_HIGH_THRESH,
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.procname = "ipfrag_high_thresh",
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.data = &sysctl_ipfrag_high_thresh,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_IPFRAG_LOW_THRESH,
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.procname = "ipfrag_low_thresh",
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.data = &sysctl_ipfrag_low_thresh,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_DYNADDR,
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.procname = "ip_dynaddr",
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.data = &sysctl_ip_dynaddr,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_IPFRAG_TIME,
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.procname = "ipfrag_time",
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.data = &sysctl_ipfrag_time,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_jiffies,
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.strategy = &sysctl_jiffies
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},
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{
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.ctl_name = NET_IPV4_TCP_KEEPALIVE_TIME,
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.procname = "tcp_keepalive_time",
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.data = &sysctl_tcp_keepalive_time,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_jiffies,
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.strategy = &sysctl_jiffies
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},
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{
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.ctl_name = NET_IPV4_TCP_KEEPALIVE_PROBES,
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.procname = "tcp_keepalive_probes",
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.data = &sysctl_tcp_keepalive_probes,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_TCP_KEEPALIVE_INTVL,
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.procname = "tcp_keepalive_intvl",
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.data = &sysctl_tcp_keepalive_intvl,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_jiffies,
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.strategy = &sysctl_jiffies
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},
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{
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.ctl_name = NET_IPV4_TCP_RETRIES1,
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.procname = "tcp_retries1",
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.data = &sysctl_tcp_retries1,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.strategy = &sysctl_intvec,
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.extra2 = &tcp_retr1_max
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},
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{
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.ctl_name = NET_IPV4_TCP_RETRIES2,
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.procname = "tcp_retries2",
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.data = &sysctl_tcp_retries2,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_TCP_FIN_TIMEOUT,
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.procname = "tcp_fin_timeout",
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.data = &sysctl_tcp_fin_timeout,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_jiffies,
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.strategy = &sysctl_jiffies
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},
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#ifdef CONFIG_SYN_COOKIES
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{
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.ctl_name = NET_TCP_SYNCOOKIES,
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.procname = "tcp_syncookies",
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.data = &sysctl_tcp_syncookies,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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#endif
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{
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.ctl_name = NET_TCP_TW_RECYCLE,
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.procname = "tcp_tw_recycle",
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.data = &tcp_death_row.sysctl_tw_recycle,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_TCP_ABORT_ON_OVERFLOW,
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.procname = "tcp_abort_on_overflow",
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.data = &sysctl_tcp_abort_on_overflow,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_TCP_STDURG,
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.procname = "tcp_stdurg",
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.data = &sysctl_tcp_stdurg,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_TCP_RFC1337,
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.procname = "tcp_rfc1337",
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.data = &sysctl_tcp_rfc1337,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_TCP_MAX_SYN_BACKLOG,
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.procname = "tcp_max_syn_backlog",
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.data = &sysctl_max_syn_backlog,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_LOCAL_PORT_RANGE,
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.procname = "ip_local_port_range",
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.data = &sysctl_local_port_range,
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.maxlen = sizeof(sysctl_local_port_range),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.strategy = &sysctl_intvec,
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.extra1 = ip_local_port_range_min,
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.extra2 = ip_local_port_range_max
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},
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{
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.ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
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.procname = "icmp_echo_ignore_all",
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.data = &sysctl_icmp_echo_ignore_all,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
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.procname = "icmp_echo_ignore_broadcasts",
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.data = &sysctl_icmp_echo_ignore_broadcasts,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
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.procname = "icmp_ignore_bogus_error_responses",
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.data = &sysctl_icmp_ignore_bogus_error_responses,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
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.procname = "icmp_errors_use_inbound_ifaddr",
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.data = &sysctl_icmp_errors_use_inbound_ifaddr,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_ROUTE,
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.procname = "route",
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.maxlen = 0,
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.mode = 0555,
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.child = ipv4_route_table
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},
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#ifdef CONFIG_IP_MULTICAST
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{
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.ctl_name = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
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.procname = "igmp_max_memberships",
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.data = &sysctl_igmp_max_memberships,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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#endif
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{
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.ctl_name = NET_IPV4_IGMP_MAX_MSF,
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.procname = "igmp_max_msf",
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.data = &sysctl_igmp_max_msf,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_INET_PEER_THRESHOLD,
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.procname = "inet_peer_threshold",
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.data = &inet_peer_threshold,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_IPV4_INET_PEER_MINTTL,
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.procname = "inet_peer_minttl",
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.data = &inet_peer_minttl,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_jiffies,
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.strategy = &sysctl_jiffies
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},
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{
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.ctl_name = NET_IPV4_INET_PEER_MAXTTL,
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.procname = "inet_peer_maxttl",
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.data = &inet_peer_maxttl,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_jiffies,
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.strategy = &sysctl_jiffies
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},
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{
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.ctl_name = NET_IPV4_INET_PEER_GC_MINTIME,
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.procname = "inet_peer_gc_mintime",
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.data = &inet_peer_gc_mintime,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_jiffies,
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.strategy = &sysctl_jiffies
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},
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{
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.ctl_name = NET_IPV4_INET_PEER_GC_MAXTIME,
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.procname = "inet_peer_gc_maxtime",
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.data = &inet_peer_gc_maxtime,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_jiffies,
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.strategy = &sysctl_jiffies
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},
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{
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.ctl_name = NET_TCP_ORPHAN_RETRIES,
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.procname = "tcp_orphan_retries",
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.data = &sysctl_tcp_orphan_retries,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = NET_TCP_FACK,
|
|
.procname = "tcp_fack",
|
|
.data = &sysctl_tcp_fack,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_REORDERING,
|
|
.procname = "tcp_reordering",
|
|
.data = &sysctl_tcp_reordering,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_ECN,
|
|
.procname = "tcp_ecn",
|
|
.data = &sysctl_tcp_ecn,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_DSACK,
|
|
.procname = "tcp_dsack",
|
|
.data = &sysctl_tcp_dsack,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_MEM,
|
|
.procname = "tcp_mem",
|
|
.data = &sysctl_tcp_mem,
|
|
.maxlen = sizeof(sysctl_tcp_mem),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_WMEM,
|
|
.procname = "tcp_wmem",
|
|
.data = &sysctl_tcp_wmem,
|
|
.maxlen = sizeof(sysctl_tcp_wmem),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_RMEM,
|
|
.procname = "tcp_rmem",
|
|
.data = &sysctl_tcp_rmem,
|
|
.maxlen = sizeof(sysctl_tcp_rmem),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_APP_WIN,
|
|
.procname = "tcp_app_win",
|
|
.data = &sysctl_tcp_app_win,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_ADV_WIN_SCALE,
|
|
.procname = "tcp_adv_win_scale",
|
|
.data = &sysctl_tcp_adv_win_scale,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ICMP_RATELIMIT,
|
|
.procname = "icmp_ratelimit",
|
|
.data = &sysctl_icmp_ratelimit,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ICMP_RATEMASK,
|
|
.procname = "icmp_ratemask",
|
|
.data = &sysctl_icmp_ratemask,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_TW_REUSE,
|
|
.procname = "tcp_tw_reuse",
|
|
.data = &sysctl_tcp_tw_reuse,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_FRTO,
|
|
.procname = "tcp_frto",
|
|
.data = &sysctl_tcp_frto,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_LOW_LATENCY,
|
|
.procname = "tcp_low_latency",
|
|
.data = &sysctl_tcp_low_latency,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_IPFRAG_SECRET_INTERVAL,
|
|
.procname = "ipfrag_secret_interval",
|
|
.data = &sysctl_ipfrag_secret_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_IPFRAG_MAX_DIST,
|
|
.procname = "ipfrag_max_dist",
|
|
.data = &sysctl_ipfrag_max_dist,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.extra1 = &zero
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_NO_METRICS_SAVE,
|
|
.procname = "tcp_no_metrics_save",
|
|
.data = &sysctl_tcp_nometrics_save,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_MODERATE_RCVBUF,
|
|
.procname = "tcp_moderate_rcvbuf",
|
|
.data = &sysctl_tcp_moderate_rcvbuf,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_TSO_WIN_DIVISOR,
|
|
.procname = "tcp_tso_win_divisor",
|
|
.data = &sysctl_tcp_tso_win_divisor,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_CONG_CONTROL,
|
|
.procname = "tcp_congestion_control",
|
|
.mode = 0644,
|
|
.maxlen = TCP_CA_NAME_MAX,
|
|
.proc_handler = &proc_tcp_congestion_control,
|
|
.strategy = &sysctl_tcp_congestion_control,
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_ABC,
|
|
.procname = "tcp_abc",
|
|
.data = &sysctl_tcp_abc,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_MTU_PROBING,
|
|
.procname = "tcp_mtu_probing",
|
|
.data = &sysctl_tcp_mtu_probing,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_TCP_BASE_MSS,
|
|
.procname = "tcp_base_mss",
|
|
.data = &sysctl_tcp_base_mss,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
|
|
.procname = "tcp_workaround_signed_windows",
|
|
.data = &sysctl_tcp_workaround_signed_windows,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
#ifdef CONFIG_NET_DMA
|
|
{
|
|
.ctl_name = NET_TCP_DMA_COPYBREAK,
|
|
.procname = "tcp_dma_copybreak",
|
|
.data = &sysctl_tcp_dma_copybreak,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
#endif
|
|
{
|
|
.ctl_name = NET_TCP_SLOW_START_AFTER_IDLE,
|
|
.procname = "tcp_slow_start_after_idle",
|
|
.data = &sysctl_tcp_slow_start_after_idle,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{ .ctl_name = 0 }
|
|
};
|
|
|
|
#endif /* CONFIG_SYSCTL */
|
|
|
|
EXPORT_SYMBOL(ipv4_config);
|