SKB_PARTIAL_CSUM_SET - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Linux Networking

NAMEskb_partial_csum_set − set up and verify partial csum values for packet

SYNOPSISbool skb_partial_csum_set(struct sk_buff * skb, u16 start, u16 off);

ARGUMENTSskb the skb to set start the number of bytes after skb−>data to start checksumming​. off the offset from start to place the checksum​.

DESCRIPTIONFor untrusted partially−checksummed packets, we need to make sure the values for skb−>csum_start and skb−>csum_offset are valid so we don´t oops​. This function checks and sets those values and skb−>ip_summed: if this returns false you should drop the packet​.

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