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    Subject[PATCH AUTOSEL 4.18 22/76] mac80211: mesh: fix HWMP sequence numbering to follow standard
    Date
    From: Yuan-Chi Pang <fu3mo6goo@gmail.com>

    [ Upstream commit 1f631c3201fe5491808df143d8fcba81b3197ffd ]

    IEEE 802.11-2016 14.10.8.3 HWMP sequence numbering says:
    If it is a target mesh STA, it shall update its own HWMP SN to
    maximum (current HWMP SN, target HWMP SN in the PREQ element) + 1
    immediately before it generates a PREP element in response to a
    PREQ element.

    Signed-off-by: Yuan-Chi Pang <fu3mo6goo@gmail.com>
    Signed-off-by: Johannes Berg <johannes.berg@intel.com>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    ---
    net/mac80211/mesh_hwmp.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
    index 35ad3983ae4b..daf9db3c8f24 100644
    --- a/net/mac80211/mesh_hwmp.c
    +++ b/net/mac80211/mesh_hwmp.c
    @@ -572,6 +572,10 @@ static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
    forward = false;
    reply = true;
    target_metric = 0;
    +
    + if (SN_GT(target_sn, ifmsh->sn))
    + ifmsh->sn = target_sn;
    +
    if (time_after(jiffies, ifmsh->last_sn_update +
    net_traversal_jiffies(sdata)) ||
    time_before(jiffies, ifmsh->last_sn_update)) {
    --
    2.17.1
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