1
2The "environmental" rules for authors of any new tc actions are:
3
41) If you stealeth or borroweth any packet thou shalt be branching
5from the righteous path and thou shalt cloneth.
6
7For example if your action queues a packet to be processed later,
8or intentionally branches by redirecting a packet, then you need to
9clone the packet.
10
112) If you munge any packet thou shalt call pskb_expand_head in the case
12someone else is referencing the skb. After that you "own" the skb.
13
143) Dropping packets you don't own is a no-no. You simply return
15TC_ACT_SHOT to the caller and they will drop it.
16
17The "environmental" rules for callers of actions (qdiscs etc) are:
18
19*) Thou art responsible for freeing anything returned as being
20TC_ACT_SHOT/STOLEN/QUEUED. If none of TC_ACT_SHOT/STOLEN/QUEUED is
21returned, then all is great and you don't need to do anything.
22
23Post on netdev if something is unclear.
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