1 files changed, 52 insertions, 0 deletions

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 2e770f45d829..dfcf47f10f88 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -146,6 +146,50 @@ static int proc_tcp_available_congestion_control(ctl_table *ctl,
         return ret;
 }
 
+static int proc_allowed_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_allowed_congestion_control(tbl.data, tbl.maxlen);
+        ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
+        if (write && ret == 0)
+                ret = tcp_set_allowed_congestion_control(tbl.data);
+        kfree(tbl.data);
+        return ret;
+}
+
+static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
+                                               int nlen, void __user *oldval,
+                                               size_t __user *oldlenp,
+                                               void __user *newval, size_t newlen,
+                                               void **context)
+{
+        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, tbl.maxlen);
+        ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
+                            context);
+        if (ret == 0 && newval && newlen)
+                ret = tcp_set_allowed_congestion_control(tbl.data);
+        kfree(tbl.data);
+
+        return ret;
+
+}
+
 ctl_table ipv4_table[] = {
         {
                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
@@ -755,6 +799,14 @@ ctl_table ipv4_table[] = {
                 .mode           = 0444,
                 .proc_handler   = &proc_tcp_available_congestion_control,
         },
+        {
+                .ctl_name       = NET_TCP_ALLOWED_CONG_CONTROL,
+                .procname       = "tcp_allowed_congestion_control",
+                .maxlen         = TCP_CA_BUF_MAX,
+                .mode           = 0644,
+                .proc_handler   = &proc_allowed_congestion_control,
+                .strategy       = &strategy_allowed_congestion_control,
+        },
         { .ctl_name = 0 }
 };