skb_copy_expand
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## Name

skb_copy_expand — copy and expand sk_buff

## Synopsis

`struct sk_buff * skb_copy_expand (` | const struct sk_buff * | skb,
| int | newheadroom,
| int | newtailroom,
| gfp_t | gfp_mask`)`;

## Arguments

`skb`

  buffer to copy

`newheadroom`

  new free bytes at head

`newtailroom`

  new free bytes at tail

`gfp_mask`

  allocation priority

## Description

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.

You must pass `GFP_ATOMIC` as the allocation priority if this function is called from an interrupt.

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