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mptcp: pm: userspace: flags: clearer msg if no remote addr

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Since its introduction in commit 892f396c8e ("mptcp: netlink: issue
MP_PRIO signals from userspace PMs"), it was mandatory to specify the
remote address, because of the 'if (rem->addr.family == AF_UNSPEC)'
check done later one.

In theory, this attribute can be optional, but it sounds better to be
precise to avoid sending the MP_PRIO on the wrong subflow, e.g. if there
are multiple subflows attached to the same local ID. This can be relaxed
later on if there is a need to act on multiple subflows with one
command.

For the moment, the check to see if attr_rem is NULL can be removed,
because mptcp_pm_parse_entry() will do this check as well, no need to do
that differently here.

Reviewed-by: Geliang Tang <geliang@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Matthieu Baerts (NGI0) 2025-02-07 14:59:20 +01:00 committed by Paolo Abeni
parent a9d71b5de7
commit 58b21309f9
1 changed files with 3 additions and 5 deletions
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8
net/mptcp/pm_userspace.c
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@ -580,11 +580,9 @@ int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info)
if (ret < 0)
goto set_flags_err;
if (attr_rem) {
ret = mptcp_pm_parse_entry(attr_rem, info, false, &rem);
if (ret < 0)
goto set_flags_err;
}
ret = mptcp_pm_parse_entry(attr_rem, info, false, &rem);
if (ret < 0)
goto set_flags_err;
if (loc.addr.family == AF_UNSPEC ||
rem.addr.family == AF_UNSPEC) {