From 35bfbc94070e480f350c868abc4ff9f77e7f2051 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Thu, 9 Nov 2006 16:36:36 -0800 Subject: [PATCH] [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 Signed-off-by: David S. Miller --- net/ipv4/tcp_cong.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c index 343d6197c9..5ca7723d07 100644 --- a/net/ipv4/tcp_cong.c +++ b/net/ipv4/tcp_cong.c @@ -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; -- 2.39.5