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	#define SCF_NOOPT 0x01 /* no TCP options */			#define SCF_NOOPT 0x01 /* no TCP options */
	#define SCF_WINSCALE 0x02 /* negotiated window scaling */			#define SCF_WINSCALE 0x02 /* negotiated window scaling */
	#define SCF_TIMESTAMP 0x04 /* negotiated timestamps */			#define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
	/* MSS is implicit */			/* MSS is implicit */
	#define SCF_UNREACH 0x10 /* icmp unreachable received */			#define SCF_UNREACH 0x10 /* icmp unreachable received */
	#define SCF_SIGNATURE 0x20 /* send MD5 digests */			#define SCF_SIGNATURE 0x20 /* send MD5 digests */
	#define SCF_SACK 0x80 /* send SACK option */			#define SCF_SACK 0x80 /* send SACK option */
	#define SCF_ECN 0x100 /* send ECN setup packet */			#define SCF_ECN 0x100 /* send ECN setup packet */
				#define SCF_ACE_N 0x200 /* send ACE non-ECT setup */
				#define SCF_ACE_0 0x400 /* send ACE ECT0 setup */
				#define SCF_ACE_1 0x800 /* send ACE ECT1 setup */
				#define SCF_ACE_CE 0x1000 /* send ACE CE setup */

	struct syncache_head {			struct syncache_head {
	struct mtx sch_mtx;			struct mtx sch_mtx;
	TAILQ_HEAD(sch_head, syncache) sch_bucket;			TAILQ_HEAD(sch_head, syncache) sch_bucket;
	struct callout sch_timer;			struct callout sch_timer;
	int sch_nextc;			int sch_nextc;
	u_int sch_length;			u_int sch_length;
	struct tcp_syncache *sch_sc;			struct tcp_syncache *sch_sc;
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