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7e38017557
This patch enables fast retransmissions after one dupACK for TCP if the stream is identified as thin. This will reduce latencies for thin streams that are not able to trigger fast retransmissions due to high packet interarrival time. This mechanism is only active if enabled by iocontrol or syscontrol and the stream is identified as thin. Signed-off-by: Andreas Petlund <apetlund@simula.no> Signed-off-by: David S. Miller <davem@davemloft.net>
752 lines
17 KiB
C
752 lines
17 KiB
C
/*
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* sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
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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/igmp.h>
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#include <linux/inetdevice.h>
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#include <linux/seqlock.h>
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#include <linux/init.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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#include <net/udp.h>
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#include <net/cipso_ipv4.h>
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#include <net/inet_frag.h>
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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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/* Update system visible IP port range */
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static void set_local_port_range(int range[2])
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{
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write_seqlock(&sysctl_local_ports.lock);
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sysctl_local_ports.range[0] = range[0];
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sysctl_local_ports.range[1] = range[1];
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write_sequnlock(&sysctl_local_ports.lock);
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}
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/* Validate changes from /proc interface. */
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static int ipv4_local_port_range(ctl_table *table, int write,
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void __user *buffer,
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size_t *lenp, loff_t *ppos)
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{
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int ret;
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int range[2];
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ctl_table tmp = {
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.data = &range,
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.maxlen = sizeof(range),
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.mode = table->mode,
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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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inet_get_local_port_range(range, range + 1);
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ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
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if (write && ret == 0) {
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if (range[1] < range[0])
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ret = -EINVAL;
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else
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set_local_port_range(range);
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}
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return ret;
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}
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static int proc_tcp_congestion_control(ctl_table *ctl, int write,
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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, 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 proc_tcp_available_congestion_control(ctl_table *ctl,
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int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
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int ret;
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tbl.data = kmalloc(tbl.maxlen, GFP_USER);
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if (!tbl.data)
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return -ENOMEM;
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tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
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ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
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kfree(tbl.data);
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return ret;
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}
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static int proc_allowed_congestion_control(ctl_table *ctl,
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int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
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int ret;
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tbl.data = kmalloc(tbl.maxlen, GFP_USER);
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if (!tbl.data)
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return -ENOMEM;
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tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
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ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
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if (write && ret == 0)
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ret = tcp_set_allowed_congestion_control(tbl.data);
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kfree(tbl.data);
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return ret;
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}
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static struct ctl_table ipv4_table[] = {
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{
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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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.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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.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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.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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.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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.extra2 = &init_net,
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},
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{
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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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.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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.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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.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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.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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.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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.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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.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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},
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{
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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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.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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},
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{
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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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.extra2 = &tcp_retr1_max
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},
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{
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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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.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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},
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#ifdef CONFIG_SYN_COOKIES
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{
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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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.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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.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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.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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.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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.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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.procname = "ip_local_port_range",
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.data = &sysctl_local_ports.range,
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.maxlen = sizeof(sysctl_local_ports.range),
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.mode = 0644,
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.proc_handler = ipv4_local_port_range,
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},
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#ifdef CONFIG_IP_MULTICAST
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{
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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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.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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.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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.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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},
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{
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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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},
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{
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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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},
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{
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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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},
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{
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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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.procname = "tcp_fack",
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.data = &sysctl_tcp_fack,
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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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.procname = "tcp_reordering",
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.data = &sysctl_tcp_reordering,
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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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.procname = "tcp_ecn",
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.data = &sysctl_tcp_ecn,
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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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.procname = "tcp_dsack",
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.data = &sysctl_tcp_dsack,
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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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.procname = "tcp_mem",
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.data = &sysctl_tcp_mem,
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.maxlen = sizeof(sysctl_tcp_mem),
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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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.procname = "tcp_wmem",
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.data = &sysctl_tcp_wmem,
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.maxlen = sizeof(sysctl_tcp_wmem),
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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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.procname = "tcp_rmem",
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.data = &sysctl_tcp_rmem,
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.maxlen = sizeof(sysctl_tcp_rmem),
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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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.procname = "tcp_app_win",
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.data = &sysctl_tcp_app_win,
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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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.procname = "tcp_adv_win_scale",
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.data = &sysctl_tcp_adv_win_scale,
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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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.procname = "tcp_tw_reuse",
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.data = &sysctl_tcp_tw_reuse,
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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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.procname = "tcp_frto",
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.data = &sysctl_tcp_frto,
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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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.procname = "tcp_frto_response",
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.data = &sysctl_tcp_frto_response,
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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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.procname = "tcp_low_latency",
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.data = &sysctl_tcp_low_latency,
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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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.procname = "tcp_no_metrics_save",
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.data = &sysctl_tcp_nometrics_save,
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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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.procname = "tcp_moderate_rcvbuf",
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.data = &sysctl_tcp_moderate_rcvbuf,
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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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.procname = "tcp_tso_win_divisor",
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.data = &sysctl_tcp_tso_win_divisor,
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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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.procname = "tcp_congestion_control",
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.mode = 0644,
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.maxlen = TCP_CA_NAME_MAX,
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.proc_handler = proc_tcp_congestion_control,
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},
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{
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.procname = "tcp_abc",
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.data = &sysctl_tcp_abc,
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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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.procname = "tcp_mtu_probing",
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.data = &sysctl_tcp_mtu_probing,
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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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.procname = "tcp_base_mss",
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.data = &sysctl_tcp_base_mss,
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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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.procname = "tcp_workaround_signed_windows",
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.data = &sysctl_tcp_workaround_signed_windows,
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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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#ifdef CONFIG_NET_DMA
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{
|
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.procname = "tcp_dma_copybreak",
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.data = &sysctl_tcp_dma_copybreak,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "tcp_slow_start_after_idle",
|
|
.data = &sysctl_tcp_slow_start_after_idle,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
#ifdef CONFIG_NETLABEL
|
|
{
|
|
.procname = "cipso_cache_enable",
|
|
.data = &cipso_v4_cache_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "cipso_cache_bucket_size",
|
|
.data = &cipso_v4_cache_bucketsize,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "cipso_rbm_optfmt",
|
|
.data = &cipso_v4_rbm_optfmt,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "cipso_rbm_strictvalid",
|
|
.data = &cipso_v4_rbm_strictvalid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif /* CONFIG_NETLABEL */
|
|
{
|
|
.procname = "tcp_available_congestion_control",
|
|
.maxlen = TCP_CA_BUF_MAX,
|
|
.mode = 0444,
|
|
.proc_handler = proc_tcp_available_congestion_control,
|
|
},
|
|
{
|
|
.procname = "tcp_allowed_congestion_control",
|
|
.maxlen = TCP_CA_BUF_MAX,
|
|
.mode = 0644,
|
|
.proc_handler = proc_allowed_congestion_control,
|
|
},
|
|
{
|
|
.procname = "tcp_max_ssthresh",
|
|
.data = &sysctl_tcp_max_ssthresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_cookie_size",
|
|
.data = &sysctl_tcp_cookie_size,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_thin_linear_timeouts",
|
|
.data = &sysctl_tcp_thin_linear_timeouts,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_thin_dupack",
|
|
.data = &sysctl_tcp_thin_dupack,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "udp_mem",
|
|
.data = &sysctl_udp_mem,
|
|
.maxlen = sizeof(sysctl_udp_mem),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero
|
|
},
|
|
{
|
|
.procname = "udp_rmem_min",
|
|
.data = &sysctl_udp_rmem_min,
|
|
.maxlen = sizeof(sysctl_udp_rmem_min),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero
|
|
},
|
|
{
|
|
.procname = "udp_wmem_min",
|
|
.data = &sysctl_udp_wmem_min,
|
|
.maxlen = sizeof(sysctl_udp_wmem_min),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table ipv4_net_table[] = {
|
|
{
|
|
.procname = "icmp_echo_ignore_all",
|
|
.data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "icmp_echo_ignore_broadcasts",
|
|
.data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "icmp_ignore_bogus_error_responses",
|
|
.data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "icmp_errors_use_inbound_ifaddr",
|
|
.data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "icmp_ratelimit",
|
|
.data = &init_net.ipv4.sysctl_icmp_ratelimit,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_ms_jiffies,
|
|
},
|
|
{
|
|
.procname = "icmp_ratemask",
|
|
.data = &init_net.ipv4.sysctl_icmp_ratemask,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "rt_cache_rebuild_count",
|
|
.data = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{ }
|
|
};
|
|
|
|
struct ctl_path net_ipv4_ctl_path[] = {
|
|
{ .procname = "net", },
|
|
{ .procname = "ipv4", },
|
|
{ },
|
|
};
|
|
EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
|
|
|
|
static __net_init int ipv4_sysctl_init_net(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = ipv4_net_table;
|
|
if (!net_eq(net, &init_net)) {
|
|
table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
|
|
if (table == NULL)
|
|
goto err_alloc;
|
|
|
|
table[0].data =
|
|
&net->ipv4.sysctl_icmp_echo_ignore_all;
|
|
table[1].data =
|
|
&net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
|
|
table[2].data =
|
|
&net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
|
|
table[3].data =
|
|
&net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
|
|
table[4].data =
|
|
&net->ipv4.sysctl_icmp_ratelimit;
|
|
table[5].data =
|
|
&net->ipv4.sysctl_icmp_ratemask;
|
|
table[6].data =
|
|
&net->ipv4.sysctl_rt_cache_rebuild_count;
|
|
}
|
|
|
|
net->ipv4.sysctl_rt_cache_rebuild_count = 4;
|
|
|
|
net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
|
|
net_ipv4_ctl_path, table);
|
|
if (net->ipv4.ipv4_hdr == NULL)
|
|
goto err_reg;
|
|
|
|
return 0;
|
|
|
|
err_reg:
|
|
if (!net_eq(net, &init_net))
|
|
kfree(table);
|
|
err_alloc:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static __net_exit void ipv4_sysctl_exit_net(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = net->ipv4.ipv4_hdr->ctl_table_arg;
|
|
unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
|
|
kfree(table);
|
|
}
|
|
|
|
static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
|
|
.init = ipv4_sysctl_init_net,
|
|
.exit = ipv4_sysctl_exit_net,
|
|
};
|
|
|
|
static __init int sysctl_ipv4_init(void)
|
|
{
|
|
struct ctl_table_header *hdr;
|
|
|
|
hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
|
|
if (hdr == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (register_pernet_subsys(&ipv4_sysctl_ops)) {
|
|
unregister_sysctl_table(hdr);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
__initcall(sysctl_ipv4_init);
|