Based on kernel version
5.7.10. Page generated on
2020-07-23 22:17 EST.
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The "environmental" rules for authors of any new tc actions are: 1) If you stealeth or borroweth any packet thou shalt be branching from the righteous path and thou shalt cloneth. For example if your action queues a packet to be processed later, or intentionally branches by redirecting a packet, then you need to clone the packet. 2) If you munge any packet thou shalt call pskb_expand_head in the case someone else is referencing the skb. After that you "own" the skb. 3) Dropping packets you don't own is a no-no. You simply return TC_ACT_SHOT to the caller and they will drop it. The "environmental" rules for callers of actions (qdiscs etc) are: *) Thou art responsible for freeing anything returned as being TC_ACT_SHOT/STOLEN/QUEUED. If none of TC_ACT_SHOT/STOLEN/QUEUED is returned, then all is great and you don't need to do anything. Post on netdev if something is unclear.