From 19a83d36f9837e8bd27435ebb31564a717a5d15a Mon Sep 17 00:00:00 2001 From: Michal Kubecek Date: Thu, 17 Sep 2020 01:04:10 +0200 Subject: [PATCH] ethtool: add and use message type for tunnel info reply Tunnel offload info code uses ETHTOOL_MSG_TUNNEL_INFO_GET message type (cmd field in genetlink header) for replies to tunnel info netlink request, i.e. the same value as the request have. This is a problem because we are using two separate enums for userspace to kernel and kernel to userspace message types so that this ETHTOOL_MSG_TUNNEL_INFO_GET (28) collides with ETHTOOL_MSG_CABLE_TEST_TDR_NTF which is what message type 28 means for kernel to userspace messages. As the tunnel info request reached mainline in 5.9 merge window, we should still be able to fix the reply message type without breaking backward compatibility. Fixes: c7d759eb7b12 ("ethtool: add tunnel info interface") Signed-off-by: Michal Kubecek Reviewed-by: Jakub Kicinski Signed-off-by: David S. Miller --- Documentation/networking/ethtool-netlink.rst | 3 +++ include/uapi/linux/ethtool_netlink.h | 1 + net/ethtool/tunnels.c | 4 ++-- 3 files changed, 6 insertions(+), 2 deletions(-) diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst index d53bcb3..b5a7988 100644 --- a/Documentation/networking/ethtool-netlink.rst +++ b/Documentation/networking/ethtool-netlink.rst @@ -206,6 +206,7 @@ Userspace to kernel: ``ETHTOOL_MSG_TSINFO_GET`` get timestamping info ``ETHTOOL_MSG_CABLE_TEST_ACT`` action start cable test ``ETHTOOL_MSG_CABLE_TEST_TDR_ACT`` action start raw TDR cable test + ``ETHTOOL_MSG_TUNNEL_INFO_GET`` get tunnel offload info ===================================== ================================ Kernel to userspace: @@ -239,6 +240,7 @@ Kernel to userspace: ``ETHTOOL_MSG_TSINFO_GET_REPLY`` timestamping info ``ETHTOOL_MSG_CABLE_TEST_NTF`` Cable test results ``ETHTOOL_MSG_CABLE_TEST_TDR_NTF`` Cable test TDR results + ``ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY`` tunnel offload info ===================================== ================================= ``GET`` requests are sent by userspace applications to retrieve device @@ -1363,4 +1365,5 @@ are netlink only. ``ETHTOOL_SFECPARAM`` n/a n/a ''ETHTOOL_MSG_CABLE_TEST_ACT'' n/a ''ETHTOOL_MSG_CABLE_TEST_TDR_ACT'' + n/a ``ETHTOOL_MSG_TUNNEL_INFO_GET`` =================================== ===================================== diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h index 5dcd24c..72ba36b 100644 --- a/include/uapi/linux/ethtool_netlink.h +++ b/include/uapi/linux/ethtool_netlink.h @@ -79,6 +79,7 @@ enum { ETHTOOL_MSG_TSINFO_GET_REPLY, ETHTOOL_MSG_CABLE_TEST_NTF, ETHTOOL_MSG_CABLE_TEST_TDR_NTF, + ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY, /* add new constants above here */ __ETHTOOL_MSG_KERNEL_CNT, diff --git a/net/ethtool/tunnels.c b/net/ethtool/tunnels.c index 84f2328..d93bf2d 100644 --- a/net/ethtool/tunnels.c +++ b/net/ethtool/tunnels.c @@ -200,7 +200,7 @@ int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info) reply_len = ret + ethnl_reply_header_size(); rskb = ethnl_reply_init(reply_len, req_info.dev, - ETHTOOL_MSG_TUNNEL_INFO_GET, + ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY, ETHTOOL_A_TUNNEL_INFO_HEADER, info, &reply_payload); if (!rskb) { @@ -273,7 +273,7 @@ int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb) goto cont; ehdr = ethnl_dump_put(skb, cb, - ETHTOOL_MSG_TUNNEL_INFO_GET); + ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY); if (!ehdr) { ret = -EMSGSIZE; goto out; -- 2.7.4