syn_cache_respond
int syn_cache_respond(struct syn_cache *, struct mbuf *, uint64_t, int);
(void) syn_cache_respond(sc, NULL, now, do_ecn);
(void) syn_cache_respond(sc, m, now, do_ecn);
if (syn_cache_respond(sc, m, now, do_ecn) == 0) {
if (syn_cache_respond(sc, m, now, do_ecn) == 0) {