sctp_compute_cksum
val = sctp_compute_cksum(skb, sctphoff);
sctph->checksum = sctp_compute_cksum(skb, sctphoff);
if (sh->checksum != sctp_compute_cksum(skb, dataoff)) {
hdr->checksum = sctp_compute_cksum(skb, hdroff);
sh->checksum = sctp_compute_cksum(skb, offset);
old_correct_csum = sctp_compute_cksum(skb, sctphoff);
new_csum = sctp_compute_cksum(skb, sctphoff);
sctph->checksum = sctp_compute_cksum(skb,
__le32 val = sctp_compute_cksum(skb, 0);
return sctp_compute_cksum(skb, skb_transport_offset(skb));
sh->checksum = sctp_compute_cksum(head, 0);