tcpopt
static void tcp_dooptions(struct tcpopt *, u_char *, int, boolean_t,
tcp_dooptions(struct tcpopt *to, u_char *cp, int cnt, boolean_t is_syn,
struct tcpopt to; /* options in this segment */
tcp_sack_add_blocks(struct tcpcb *tp, struct tcpopt *to)
tcp_sack_update_scoreboard(struct tcpcb *tp, struct tcpopt *to)
syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
void tcp_sack_update_scoreboard(struct tcpcb *tp, struct tcpopt *to);
int syncache_add(struct in_conninfo *, struct tcpopt *,