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[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: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -113,7 +113,7 @@ int tcp_set_default_congestion_control(const char *name)
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spin_lock(&tcp_cong_list_lock);
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ca = tcp_ca_find(name);
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#ifdef CONFIG_KMOD
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if (!ca) {
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if (!ca && capable(CAP_SYS_MODULE)) {
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spin_unlock(&tcp_cong_list_lock);
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request_module("tcp_%s", name);
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@ -236,9 +236,19 @@ int tcp_set_congestion_control(struct sock *sk, const char *name)
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rcu_read_lock();
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ca = tcp_ca_find(name);
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/* no change asking for existing value */
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if (ca == icsk->icsk_ca_ops)
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goto out;
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#ifdef CONFIG_KMOD
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/* not found attempt to autoload module */
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if (!ca && capable(CAP_SYS_MODULE)) {
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rcu_read_unlock();
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request_module("tcp_%s", name);
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rcu_read_lock();
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ca = tcp_ca_find(name);
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}
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#endif
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if (!ca)
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err = -ENOENT;
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