sctp_copy_mbufchain
m = sctp_copy_mbufchain(ca->m, NULL);
outchain = sctp_copy_mbufchain(chk->data,
outchain = sctp_copy_mbufchain(chk->data, outchain);
m = sctp_copy_mbufchain(chk->data, m);
m = sctp_copy_mbufchain(chk->data, m);
m = sctp_copy_mbufchain(fwd->data, m);