tcpsinfo_t Structure

The tcpsinfo_t structure contains tcp state information.

typedef struct tcpsinfo {
        uintptr tcps_addr;
        int tcps_local;       /* is delivered locally, boolean */
        int tcps_active;       /* active open (from here), boolean */
        uint16_t tcps_lport;      /* local port */
        uint16_t tcps_rport;      /* remote port */
string tcps_laddr;		/* local address, as a string */
string tcps_raddr;		/* remote address, as a string */
int32_t tcps_state;/* TCP state. Use inline tcp_state_string[]to convert to string */
        uint32_t tcps_iss;     /* initial sequence # sent */
        uint32_t tcps_suna;     /* sequence # sent but unacked */
        uint32_t tcps_snxt;     /* next sequence # to send */
        uint32_t tcps_rack;     /* sequence # acked */
        uint32_t tcps_rnxt;     /* next sequence # expected */
        uint32_t tcps_swnd;     /* send window size */
        uint32_t tcps_snd_ws;   /* send window scaling */
        uint32_t tcps_rwnd;     /* receive window size */
        uint32_t tcps_rcv_ws;   /* receive window scaling */
	uint32_t tcps_cwnd;		/* congestion window */
	uint32_t tcps_cwnd_ssthresh;	/* threshold for congestion avoidance */
	uint32_t tcps_sack_fack;	/* SACK sequence # acked */
	uint32_t tcps_sack_snxt;	/* next SACK seq # for retransmission */
        uint32_t tcps_rto;              /* round-trip timeout, msec */
	uint32_t tcps_mss;		/* max segment size */
        int tcps_retransmit;            /* retransmit send event, boolean */
} tcpsinfo_t;

It may seem redundant to supply the local and remote ports and addresses here as well as in the tcpinfo_t below, but the tcp:::state-change probes do not have associated tcpinfo_t data, so in order to map the state change to a specific port, you require this data here.

Table 11-68 tcpsinfo_t Members

Member	Description
tcps_addr	Address of translated tcp_t *.
tcps_local	Local, boolean. 0: is not delivered locally and uses a physical network interface, 1: is delivered locally including loopback interfaces, such as lo0.
tcps_active	Active open, boolean. 0: TCP connection was created from a remote host, 1: TCP connection was created from this host.
tcps_lport	Local port associated with the TCP connection.
tcps_rport	Remote port associated with the TCP connection.
tcps_laddr	Local address associated with the TCP connection, as a string.
tcps_raddr	Remote address associated with the TCP connection, as a string.
tcps_state	The following states are available for a tcps_state member: TCP_STATE_CLOSED TCP_STATE_IDLE TCP_STATE_BOUND TCP_STATE_LISTEN TCP_STATE_SYN_SENT TCP_STATE_SYN_RECEIVED TCP_STATE_ESTABLISHED TCP_STATE_CLOSE_WAIT TCP_STATE_FIN_WAIT_1 TCP_STATE_CLOSING TCP_STATE_LAST_ACK TCP_STATE_FIN_WAIT_2 TCP_STATE_TIME_WAIT Use inline tcp_state_string[] to convert state to a string.
tcps_iss	Initial sequence number sent.
tcps_suna	Lowest sequence number for which you have sent data but not received acknowledgement.
tcps_snxt	Next sequence number to send. tcps_snxt - tcps_suna gives the number of bytes pending acknowledgement for the TCP connection.
tcps_rack	Highest sequence number for which you have received and sent acknowledgement.
tcps_rnxt	Next sequence number expected on receive side. tcps_rnxt - tcps_rack gives the number of bytes you have received but not yet acknowledged for the TCP connection.
tcps_swnd	TCP send window size.
tcps_snd_ws	TCP send window scale. tcps_swnd << tcp_snd_ws gives the scaled window size if window scaling options are in use.
tcps_rwnd	TCP receive window size.
tcps_rcv_ws	TCP receive window scale. tcps_rwnd << tcp_rcv_ws gives the scaled window size if window scaling options are in use.
tcps_cwnd	TCP congestion window size. tcps_cwnd_ssthresh TCP congestion window threshold. When the congestion window is greater than ssthresh, congestion avoidance begins.
tcps_cwnd_ssthresh	TCP congestion window threshold. When the congestion window is greater than ssthresh, congestion avoidance begins.
tcps_sack_fack	Highest SACK-acked sequence number.
tcps_sack_snxt	Next sequence num to be retransmitted using SACK.
tcps_rto	Round-trip timeout. If you do not receive acknowledgement of data sent tcps_rto msec ago, retransmit is required.
tcps_mss	Maximum segment size.
tcps_retransmit	Send is a retransmit, boolean. 1 for tcp:::send events that are retransmissions, 0 for tcp events that are not send events, and for send events that are not retransmissions.