SKB_CHECKSUM_TRIMMED(9)

NAME
skb_checksum_trimmed - validate checksum of an skb

SYNOPSIS

struct sk_buff * skb_checksum_trimmed(struct sk_buff * skb, unsigned int transport_len, __sum16(*skb_chkf) (struct sk_buff *skb));

ARGUMENTS

skb
    the skb to check

transport_len
    the data length beyond the network header

skb_chkf
    checksum function to use

DESCRIPTION

Applies the given checksum function skb_chkf to the provided skb. Returns a checked and maybe trimmed skb. Returns NULL on error.

If the skb has data beyond the given transport length, then a trimmed & cloned skb is checked and returned.

Caller needs to set the skb transport header and free any returned skb if it differs from the provided skb.

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