From 1a5b42ba858ba80bba81595cd75ac7ad9c0c965f Mon Sep 17 00:00:00 2001
From: Gao Feng <gfree.wind@gmail.com>
Date: Thu, 4 Aug 2022 23:04:21 +0800
Subject: [PATCH] net: bpf: Use the protocol's set_rcvlowat behavior if there
is one
The commit d1361840f8c5 ("tcp: fix SO_RCVLOWAT and RCVBUF autotuning")
add one new (struct proto_ops)->set_rcvlowat method so that a protocol
can override the default setsockopt(SO_RCVLOWAT) behavior.
The prior bpf codes don't check and invoke the protos's set_rcvlowat,
now correct it.
Signed-off-by: Gao Feng <gfree.wind@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/core/filter.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/core/filter.c b/net/core/filter.c
index 5669248aff25b..e8508aaafd27d 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5063,7 +5063,10 @@ static int __bpf_setsockopt(struct sock *sk, int level, int optname,
case SO_RCVLOWAT:
if (val < 0)
val = INT_MAX;
- WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
+ if (sk->sk_socket && sk->sk_socket->ops->set_rcvlowat)
+ ret = sk->sk_socket->ops->set_rcvlowat(sk, val);
+ else
+ WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
break;
case SO_MARK:
if (sk->sk_mark != val) {
--
GitLab