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mptcp: pm: netlink: announce server-side flag

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Now that the 'flags' attribute is used, it seems interesting to add one
flag for 'server-side', a boolean value.

This is duplicating the info from the dedicated 'server-side' attribute,
but it will be deprecated in the next commit, and removed in a few
versions.

Reviewed-by: Geliang Tang <geliang@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20250919-net-next-mptcp-server-side-flag-v1-2-a97a5d561a8b@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Matthieu Baerts (NGI0) 2025-09-19 14:08:59 +02:00 committed by Jakub Kicinski
parent c9809f03c1
commit 3d7ae91107
2 changed files with 8 additions and 4 deletions
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1
include/uapi/linux/mptcp.h
View File

@ -32,6 +32,7 @@
#define MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED _BITUL(1)
#define MPTCP_PM_EV_FLAG_DENY_JOIN_ID0 _BITUL(0)
#define MPTCP_PM_EV_FLAG_SERVER_SIDE _BITUL(1)
#define MPTCP_PM_ADDR_FLAG_SIGNAL (1 << 0)
#define MPTCP_PM_ADDR_FLAG_SUBFLOW (1 << 1)

11
net/mptcp/pm_netlink.c
View File

@ -413,10 +413,13 @@ static int mptcp_event_created(struct sk_buff *skb,
if (err)
return err;
/* only set when it is the server side */
if (READ_ONCE(msk->pm.server_side) &&
nla_put_u8(skb, MPTCP_ATTR_SERVER_SIDE, 1))
return -EMSGSIZE;
if (READ_ONCE(msk->pm.server_side)) {
flags |= MPTCP_PM_EV_FLAG_SERVER_SIDE;
/* only set when it is the server side */
if (nla_put_u8(skb, MPTCP_ATTR_SERVER_SIDE, 1))
return -EMSGSIZE;
}
if (READ_ONCE(msk->pm.remote_deny_join_id0))
flags |= MPTCP_PM_EV_FLAG_DENY_JOIN_ID0;