skb_checksum_trimmed9
Validate checksum of an skb
Usage
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
Overview
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.