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Commit 35bfbc94 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

[TCP]: Allow autoloading of congestion control via setsockopt. 



If user has permision to load modules, then autoload then attempt
autoload of TCP congestion module.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ce7bc3bf

net/ipv4/tcp_cong.c

+11 −1
Original line number Diff line number Diff line
@@ -113,7 +113,7 @@ int tcp_set_default_congestion_control(const char *name) 
	spin_lock(&tcp_cong_list_lock);

	ca = tcp_ca_find(name);

#ifdef CONFIG_KMOD

	if (!ca) {

	if (!ca && capable(CAP_SYS_MODULE)) {

		spin_unlock(&tcp_cong_list_lock);



		request_module("tcp_%s", name);
@@ -236,9 +236,19 @@ int tcp_set_congestion_control(struct sock *sk, const char *name) 


	rcu_read_lock();

	ca = tcp_ca_find(name);

	/* no change asking for existing value */

	if (ca == icsk->icsk_ca_ops)

		goto out;



#ifdef CONFIG_KMOD

	/* not found attempt to autoload module */

	if (!ca && capable(CAP_SYS_MODULE)) {

		rcu_read_unlock();

		request_module("tcp_%s", name);

		rcu_read_lock();

		ca = tcp_ca_find(name);

	}

#endif

	if (!ca)

		err = -ENOENT;