skb_checksum_trimmed (9) Linux Manual Page
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.