netdev - [PATCH bpf-next 05/14] bpf: net: Avoid do_ip_setsockopt() taking sk lock when called from bpf

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Date:   Tue, 26 Jul 2022 23:09:28 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, <kernel-team@...com>,
        Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH bpf-next 05/14] bpf: net: Avoid do_ip_setsockopt() taking sk lock when called from bpf

Similar to the earlier patch that avoids sock_setsockopt() from
taking sk lock when called from bpf.  This patch changes
do_ip_setsockopt() to use the {lock,release}_sock_sockopt().

Signed-off-by: Martin KaFai Lau <kafai@...com>
---
 net/ipv4/ip_sockglue.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index a8a323ecbb54..8271ad565a3a 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -944,7 +944,7 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname,
 	err = 0;
 	if (needs_rtnl)
 		rtnl_lock();
-	lock_sock(sk);
+	lock_sock_sockopt(sk, optval);
 
 	switch (optname) {
 	case IP_OPTIONS:
@@ -1368,13 +1368,13 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname,
 		err = -ENOPROTOOPT;
 		break;
 	}
-	release_sock(sk);
+	release_sock_sockopt(sk, optval);
 	if (needs_rtnl)
 		rtnl_unlock();
 	return err;
 
 e_inval:
-	release_sock(sk);
+	release_sock_sockopt(sk, optval);
 	if (needs_rtnl)
 		rtnl_unlock();
 	return -EINVAL;
-- 
2.30.2