From: Kishen Maloor Date: Mon, 2 May 2022 20:52:36 +0000 (-0700) Subject: mptcp: expose server_side attribute in MPTCP netlink events X-Git-Tag: for-5.19/block-exec-2022-06-02~49^2~196^2~1 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=41b3c69bf9414375319290c59f198ff5c71d273f;p=linux-2.6-block.git mptcp: expose server_side attribute in MPTCP netlink events This change records the 'server_side' attribute of MPTCP_EVENT_CREATED and MPTCP_EVENT_ESTABLISHED events to inform their recipient about the Client/Server role of the running MPTCP application. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/246 Acked-by: Paolo Abeni Signed-off-by: Kishen Maloor Signed-off-by: Mat Martineau Signed-off-by: Jakub Kicinski --- diff --git a/include/uapi/linux/mptcp.h b/include/uapi/linux/mptcp.h index 9690efedb5fa..e41ea01a94bb 100644 --- a/include/uapi/linux/mptcp.h +++ b/include/uapi/linux/mptcp.h @@ -188,6 +188,7 @@ enum mptcp_event_attr { MPTCP_ATTR_IF_IDX, /* s32 */ MPTCP_ATTR_RESET_REASON,/* u32 */ MPTCP_ATTR_RESET_FLAGS, /* u32 */ + MPTCP_ATTR_SERVER_SIDE, /* u8 */ __MPTCP_ATTR_AFTER_LAST }; diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index eeaa96bcae6c..a4430c576ce9 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -1985,6 +1985,9 @@ static int mptcp_event_created(struct sk_buff *skb, if (err) return err; + if (nla_put_u8(skb, MPTCP_ATTR_SERVER_SIDE, READ_ONCE(msk->pm.server_side))) + return -EMSGSIZE; + return mptcp_event_add_subflow(skb, ssk); }