• WANG Cong's avatar
    net: clear skb->priority when forwarding to another netns · 08b4b8ea
    WANG Cong authored
    skb->priority can be set for two purposes:
    
    1) With respect to IP TOS field, which is computed by a mask.
    Ususally used for priority qdisc's (pfifo, prio etc.), on TX
    side (we only have ingress qdisc on RX side).
    
    2) Used as a classid or flowid, works in the same way with tc
    classid. What's more, this can even override the classid
    of tc filters.
    
    For case 1), it has been respected within its netns, I don't
    see any point of keeping it for another netns, especially
    when packets will be forwarded to Rx path (no matter from TX
    path or RX path).
    
    For case 2) we care, our applications run inside a netns,
    and we classify the packets by our own filters outside,
    If some application sets this priority, it could bypass
    our filters, therefore clear it when moving out of a netns,
    it makes no sense to bypass tc filters out of its netns.
    Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    08b4b8ea
dev.c 186 KB