Blame view
Documentation/networking/tc-actions-env-rules.txt
893 Bytes
d892afe2c [NET]: Document s... |
1 |
|
25985edce Fix common misspe... |
2 |
The "environmental" rules for authors of any new tc actions are: |
d892afe2c [NET]: Document s... |
3 4 5 |
1) If you stealeth or borroweth any packet thou shalt be branching from the righteous path and thou shalt cloneth. |
d91958815 Documentation cle... |
6 7 |
For example if your action queues a packet to be processed later, or intentionally branches by redirecting a packet, then you need to |
d892afe2c [NET]: Document s... |
8 |
clone the packet. |
d91958815 Documentation cle... |
9 |
|
d892afe2c [NET]: Document s... |
10 11 |
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. |
d892afe2c [NET]: Document s... |
12 |
|
d91958815 Documentation cle... |
13 |
3) Dropping packets you don't own is a no-no. You simply return |
d892afe2c [NET]: Document s... |
14 |
TC_ACT_SHOT to the caller and they will drop it. |
25985edce Fix common misspe... |
15 |
The "environmental" rules for callers of actions (qdiscs etc) are: |
d892afe2c [NET]: Document s... |
16 |
|
d91958815 Documentation cle... |
17 |
*) Thou art responsible for freeing anything returned as being |
d892afe2c [NET]: Document s... |
18 |
TC_ACT_SHOT/STOLEN/QUEUED. If none of TC_ACT_SHOT/STOLEN/QUEUED is |
d91958815 Documentation cle... |
19 |
returned, then all is great and you don't need to do anything. |
d892afe2c [NET]: Document s... |
20 21 |
Post on netdev if something is unclear. |