linux-kernel - udp: Add support for getsockopt(..., ..., UDP

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Message-id: <5AFF0F2A-96FD-40D6-9CE6-74F7CE8CEB4F@apple.com>
Date:   Thu, 25 Mar 2021 19:50:31 +0100
From:   Norman Maurer <norman_maurer@...le.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, dsahern@...nel.org
Subject: udp: Add support for getsockopt(..., ..., UDP_GRO, ..., ...);

Support for UDP_GRO was added in the past but the implementation for
getsockopt was missed which did lead to an error when we tried to
retrieve the setting for UDP_GRO. This patch adds the missing switch
case for UDP_GRO

Fixes: e20cf8d3f1f7 ("udp: implement GRO for plain UDP sockets.")
Signed-off-by: Norman Maurer <norman_maurer@...le.com>
---
 net/ipv4/udp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 4a0478b17243..99d743eb9dc4 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2754,6 +2754,10 @@ int udp_lib_getsockopt(struct sock *sk, int level, int optname,
 		val = up->gso_size;
 		break;

+	case UDP_GRO:
+		val = up->gro_enabled;
+		break;
+
 	/* The following two cannot be changed on UDP sockets, the return is
 	 * always 0 (which corresponds to the full checksum coverage of UDP). */
 	case UDPLITE_SEND_CSCOV:
--
2.29.2