[TCP]: Add tcp_available_congestion_control sysctl.
Create /proc/sys/net/ipv4/tcp_available_congestion_control
that reflects currently available TCP choices.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 15061b3..2e770f4 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -129,6 +129,23 @@
return ret;
}
+static int proc_tcp_available_congestion_control(ctl_table *ctl,
+ int write, struct file * filp,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
+ int ret;
+
+ tbl.data = kmalloc(tbl.maxlen, GFP_USER);
+ if (!tbl.data)
+ return -ENOMEM;
+ tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
+ ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
+ kfree(tbl.data);
+ return ret;
+}
+
ctl_table ipv4_table[] = {
{
.ctl_name = NET_IPV4_TCP_TIMESTAMPS,
@@ -731,6 +748,13 @@
.proc_handler = &proc_dointvec,
},
#endif /* CONFIG_NETLABEL */
+ {
+ .ctl_name = NET_TCP_AVAIL_CONG_CONTROL,
+ .procname = "tcp_available_congestion_control",
+ .maxlen = TCP_CA_BUF_MAX,
+ .mode = 0444,
+ .proc_handler = &proc_tcp_available_congestion_control,
+ },
{ .ctl_name = 0 }
};