1PSKB_EXPAND_HEAD(9)            Linux Networking            PSKB_EXPAND_HEAD(9)
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NAME

6       pskb_expand_head - reallocate header of sk_buff
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SYNOPSIS

9       int pskb_expand_head(struct sk_buff * skb, int nhead, int ntail,
10                            gfp_t gfp_mask);
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ARGUMENTS

13       skb
14           buffer to reallocate
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16       nhead
17           room to add at head
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19       ntail
20           room to add at tail
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22       gfp_mask
23           allocation priority
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DESCRIPTION

26       Expands (or creates identical copy, if nhead and ntail are zero) header
27       of skb.  sk_buff itself is not changed.  sk_buff MUST have reference
28       count of 1. Returns zero in the case of success or error, if expansion
29       failed. In the last case, sk_buff is not changed.
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31       All the pointers pointing into skb header may change and must be
32       reloaded after call to this function.
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35Kernel Hackers Manual 3.10         June 2019               PSKB_EXPAND_HEAD(9)
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