sctp_cwnd_log_req
struct sctp_cwnd_log_req *req;
size_limit = (m->m_len - sizeof(struct sctp_cwnd_log_req));
req = mtod(m, struct sctp_cwnd_log_req *);
m->m_len = (cnt_out * sizeof(struct sctp_cwnd_log_req)) + sizeof(struct sctp_cwnd_log_req);