skb_copy_expand (9) - Linux Man Pages
skb_copy_expand: copy and expand sk_buff
skb_copy_expand - copy and expand sk_buff
struct sk_buff * skb_copy_expand(const struct sk_buff
*skb, int newheadroom, int newtailroom, gfp_t gfp_mask);
- buffer to copy
- new free bytes at head
- new free bytes at tail
- allocation priority
Make a copy of both an sk_buff and its data and while doing so allocate additional space.
This is used when the caller wishes to modify the data and needs a private copy of the data to alter as well as more space for new fields. Returns NULL on failure or the pointer to the buffer on success. The returned buffer has a reference count of 1.