Man page 9 : skb_prepare_seq_read

skb_prepare_seq_read - Prepare a sequential read of skb data

void skb_prepare_seq_read(struct sk_buff *  skb , unsigned int  from , unsigned int  to , struct skb_seq_state *  st );

skb
    the buffer to read

from
    lower offset of data to be read

to
    upper offset of data to be read

st
    state variable

Initializes the specified state variable. Must be called before invoking skb_seq_read for the first time.