BUILD_SKB(9) Linux Networking BUILD_SKB(9)

NAME build_skb - build a network buffer

SYNOPSIS struct sk_buff * build_skb(void * data);

ARGUMENTS data data buffer provided by caller

DESCRIPTION Allocate 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.

NOTES Before 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.

COPYRIGHT Kernel Hackers Manual 2.6. September 2014 BUILD_SKB(9)