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| 2 |
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| 3 | struct sk_buff
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| 4 | ==============
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| 5 |
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| 6 | :c:type:`sk_buff` is the main networking structure representing
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| 7 | a packet.
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| 8 |
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| 9 | Basic sk_buff geometry
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| 10 | ----------------------
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| 11 |
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| 12 | .. kernel-doc:: include/linux/skbuff.h
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| 13 | :doc: Basic sk_buff geometry
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| 14 |
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| 15 | Shared skbs and skb clones
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| 16 | --------------------------
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| 17 |
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| 18 | :c:member:`sk_buff.users` is a simple refcount allowing multiple entities
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| 19 | to keep a struct sk_buff alive. skbs with a ``sk_buff.users != 1`` are referred
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| 20 | to as shared skbs (see skb_shared()).
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| 21 |
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| 22 | skb_clone() allows for fast duplication of skbs. None of the data buffers
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| 23 | get copied, but caller gets a new metadata struct (struct sk_buff).
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| 24 | &skb_shared_info.refcount indicates the number of skbs pointing at the same
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| 25 | packet data (i.e. clones).
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| 26 |
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| 27 | dataref and headerless skbs
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| 28 | ---------------------------
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| 29 |
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| 30 | .. kernel-doc:: include/linux/skbuff.h
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| 31 | :doc: dataref and headerless skbs
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