1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
73  * take and shift over by 1 minus the value (1-8).
135 #define SEGQ_EMPTY(tp) TAILQ_EMPTY(&(tp)->t_segq)
151 	uint64_t end;		/* End if not open-range req */
176  *  - sendmap
177  *  - timers
178  *  - rack_times
202  * is unfilled. This may mean that a time is off by a micro-second
231 #define SNDMAP_TLP		0x000080/* segment sent as tail-loss-probe */
311 #define	t_zero_size	(sizeof(struct tcpcb) - \
330 #define	HPTS_CPU_NONE	((uint16_t)-1)
354 	uint32_t snd_cwnd;		/* congestion-controlled window */
365 	int	t_srtt;			/* smoothed round-trip time */
366 	int	t_rttvar;		/* variance in round-trip time */
390 	tcp_seq	snd_recover;		/* for use in NewReno Fast Recovery */
406 	u_int	t_pmtud_saved_maxseg;	/* pre-blackhole MSS */
416 	int	t_sndzerowin;		/* zero-window updates sent */
428 	int	t_rcvoopack;		/* out-of-order packets received */
443 	int64_t	t_pacing_rate;		/* bytes / sec, -1 => unlimited */
448 	struct statsblob *t_stats;	/* Per-connection stats */
465 	/* TCP Fast Open */
477 	} t_tfo_cookie;			/* TCP Fast Open cookie to send */
554  * you return non-zero (an error number) to say no you can't.
585  * of the condtion (ptr == &tp->t_fb_ptr) will be
593  * TCP_QUERY_SENDMAP - Query of outstanding data.
594  * TCP_QUERY_TIMERS_UP	- Query about running timers.
595  * TCP_SUPPORTED_LRO - Declaration in req_param of 
598  * TCP_QUERY_RACK_TIMES	- Enquire about various timestamps
609  * stack does not communicate via chg messages that it too does,
659 #define	tptoinpcb(tp)	(&(tp)->t_inpcb)
660 #define	tptosocket(tp)	(tp)->t_inpcb.inp_socket
676 	rv = tp->t_fb->tfb_tcp_output(tp);  in tcp_output()
678 		KASSERT(tp->t_fb->tfb_flags & TCP_FUNC_OUTPUT_CANDROP,  in tcp_output()
680 		    tp->t_fb->tfb_tcp_block_name, tp));  in tcp_output()
681 		tp = tcp_drop(tp, -rv);  in tcp_output()
702 	rv = tp->t_fb->tfb_tcp_output(tp);  in tcp_output_unlock()
704 		KASSERT(tp->t_fb->tfb_flags & TCP_FUNC_OUTPUT_CANDROP,  in tcp_output_unlock()
706 		    tp->t_fb->tfb_tcp_block_name, tp));  in tcp_output_unlock()
707 		rv = -rv;  in tcp_output_unlock()
734 	rv = tp->t_fb->tfb_tcp_output(tp);  in tcp_output_nodrop()
735 	KASSERT(rv >= 0 || tp->t_fb->tfb_flags & TCP_FUNC_OUTPUT_CANDROP,  in tcp_output_nodrop()
737 	    tp->t_fb->tfb_tcp_block_name, tp));  in tcp_output_nodrop()
754                 tcp_output_retval = -tcp_output_retval;  in tcp_unlock_or_drop()
767 	return ((ack - tp->snd_una) / tp->t_maxseg +  in tcp_packets_this_ack()
768 		((((ack - tp->snd_una) % tp->t_maxseg) != 0) ? 1 : 0));  in tcp_packets_this_ack()
799 #define	TF_FASTRECOVERY	0x00100000	/* in NewReno Fast Recovery */
800 #define	TF_WASFRECOVERY	0x00200000	/* was in NewReno Fast Recovery */
810 #define	TF_FASTOPEN	0x80000000	/* TCP Fast Open indication */
824 #define	BYTES_THIS_ACK(tp, th)	(th->th_ack - tp->snd_una)
838 #define	TF2_LOG_AUTO		0x00000008 /* Session is auto-logging. */
840 #define	TF2_ECN_PERMIT		0x00000020 /* connection ECN-ready */
873 #define	TOF_SIGNATURE	0x0040		/* TCP-MD5 signature option (RFC2385) */
875 #define	TOF_FASTOPEN	0x0100		/* TCP Fast Open (TFO) cookie */
880 	u_char		*to_signature;	/* pointer to the TCP-MD5 signature */
892 #define	TO_SYN		0x01		/* parse SYN-only options */
900 	uint32_t	hc_sendpipe;	/* outbound delay-bandwidth product */
901 	uint32_t	hc_recvpipe;	/* inbound delay-bandwidth product */
909  * The smoothed round-trip time and estimated variance
912  * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
928  * 1 extra tick because of +-1/2 tick uncertainty in the
937  * fast networks.
940 	max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT))  \
941 	  + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
973 	uint64_t tcps_sndacks;		/* ack-only packets sent */
976 	uint64_t tcps_sndwinup;		/* window update-only packets sent */
986 	uint64_t tcps_rcvduppack;	/* duplicate-only packets received */
987 	uint64_t tcps_rcvdupbyte;	/* duplicate-only bytes received */
989 	uint64_t tcps_rcvpartdupbyte;	/* dup. bytes in part-dup. packets */
990 	uint64_t tcps_rcvoopack;	/* out-of-order packets received */
991 	uint64_t tcps_rcvoobyte;	/* out-of-order bytes received */
1022 	uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
1076 	uint64_t tcps_tw_recycles;	/* Times time-wait was recycled. */
1077 	uint64_t tcps_tw_resets;	/* Times time-wait sent a reset. */
1078 	uint64_t tcps_tw_responds;	/* Times time-wait sent a valid ack. */
1081 	uint64_t tcps_ace_nect;		/* ACE SYN packet with Non-ECT */
1115  * In-kernel consumers can use these accessor macros directly to update
1144 #define	TCPSTATES_DEC(state)	counter_u64_add(V_tcps_states[state], -1)
1169  * TCB structure exported to user-land via sysctl(3).
1175  * (s) - used by userland utilities in src
1176  * (p) - used by utilities in ports
1177  * (3) - is known to be used by third party software not in ports
1178  * (n) - no known usage
1223  * TCP function information (name-to-id mapping, aliases, and refcnt)
1224  * exported to user-land via sysctl(3).
1236 #define	TCPCTL_DO_RFC1323	1	/* use RFC-1323 extensions */
1569 	tp->t_flags2 &= ~(TF2_SUPPORTS_MBUFQ|  in tcp_lro_features_off()
1580 	th->th_seq = ntohl(th->th_seq);  in tcp_fields_to_host()
1581 	th->th_ack = ntohl(th->th_ack);  in tcp_fields_to_host()
1582 	th->th_win = ntohs(th->th_win);  in tcp_fields_to_host()
1583 	th->th_urp = ntohs(th->th_urp);  in tcp_fields_to_host()
1590 	th->th_seq = htonl(th->th_seq);  in tcp_fields_to_net()
1591 	th->th_ack = htonl(th->th_ack);  in tcp_fields_to_net()
1592 	th->th_win = htons(th->th_win);  in tcp_fields_to_net()
1593 	th->th_urp = htons(th->th_urp);  in tcp_fields_to_net()