BUILD_SKB - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Linux Networking

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NAMEbuild_skb − build a network buffer

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SYNOPSISstruct sk_buff * build_skb(void * data);

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ARGUMENTSdata data buffer provided by caller

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DESCRIPTIONAllocate a new sk_buff​. Caller provides space holding head and skb_shared_info​. data must have been allocated by kmalloc The return is the new skb buffer​. On a failure the return is NULL, and data is not freed​.

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NOTESBefore IO, driver allocates only data buffer where NIC put incoming frame Driver should add room at head (NET_SKB_PAD) and MUST add room at tail (SKB_DATA_ALIGN(skb_shared_info)) After IO, driver calls build_skb, to allocate sk_buff and populate it before giving packet to stack​. RX rings only contains data buffers, not full skbs​.

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