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  • Jamal Hadi Salim's avatar
    net sched ife action: Introduce skb tcindex metadata encap decap · 408fbc22
    Jamal Hadi Salim authored
    
    
    Sample use case of how this is encoded:
    user space via tuntap (or a connected VM/Machine/container)
    encodes the tcindex TLV.
    
    Sample use case of decoding:
    IFE action decodes it and the skb->tc_index is then used to classify.
    So something like this for encoded ICMP packets:
    
    .. first decode then reclassify... skb->tcindex will be set
    sudo $TC filter add dev $ETH parent ffff: prio 2 protocol 0xbeef \
    u32 match u32 0 0 flowid 1:1 \
    action ife decode reclassify
    
    ...next match the decode icmp packet...
    sudo $TC filter add dev $ETH parent ffff: prio 4 protocol ip \
    u32 match ip protocol 1 0xff flowid 1:1 \
    action continue
    
    ... last classify it using the tcindex classifier and do someaction..
    sudo $TC filter add dev $ETH parent ffff: prio 5 protocol ip \
    handle 0x11 tcindex classid 1:1 \
    action blah..
    
    Signed-off-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    408fbc22