+#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
+#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
+#define TCP_MAXSEG 0x02 /* set maximum segment size */
+#define TCP_NOPUSH 0x04 /* don't push last block of write */
+#define TCP_NOOPT 0x08 /* don't use TCP options */
+#define TCP_KEEPALIVE 0x10 /* idle time used when SO_KEEPALIVE is enabled */
+#define TCP_CONNECTIONTIMEOUT 0x20 /* connection timeout */
+#define PERSIST_TIMEOUT 0x40 /* time after which a connection in
+ * persist timeout will terminate.
+ * see draft-ananth-tcpm-persist-02.txt
+ */
+#define TCP_RXT_CONNDROPTIME 0x80 /* time after which tcp retransmissions will be
+ * stopped and the connection will be dropped
+ */
+#define TCP_RXT_FINDROP 0x100 /* when this option is set, drop a connection
+ * after retransmitting the FIN 3 times. It will
+ * prevent holding too many mbufs in socket
+ * buffer queues.
+ */
+#define TCP_KEEPINTVL 0x101 /* interval between keepalives */
+#define TCP_KEEPCNT 0x102 /* number of keepalives before close */
+#define TCP_SENDMOREACKS 0x103 /* always ack every other packet */
+#define TCP_ENABLE_ECN 0x104 /* Enable ECN on a connection */
+#define TCP_FASTOPEN 0x105 /* Enable/Disable TCP Fastopen on this socket */
+#define TCP_CONNECTION_INFO 0x106 /* State of TCP connection */
+
+#ifdef PRIVATE
+#define TCP_INFO 0x200 /* retrieve tcp_info structure */
+#define TCP_MEASURE_SND_BW 0x202 /* Measure sender's bandwidth for this connection */
+#endif /* PRIVATE */
+
+
+#define TCP_NOTSENT_LOWAT 0x201 /* Low water mark for TCP unsent data */
+
+#ifdef PRIVATE
+#define TCP_MEASURE_BW_BURST 0x203 /* Burst size to use for bandwidth measurement */
+#define TCP_PEER_PID 0x204 /* Lookup pid of the process we're connected to */
+#define TCP_ADAPTIVE_READ_TIMEOUT 0x205 /* Read timeout used as a multiple of RTT */
+/*
+ * Enable message delivery on a socket, this feature is currently unsupported and
+ * is subjected to change in future.
+ */
+#define TCP_ENABLE_MSGS 0x206
+#define TCP_ADAPTIVE_WRITE_TIMEOUT 0x207 /* Write timeout used as a multiple of RTT */
+#define TCP_NOTIMEWAIT 0x208 /* Avoid going into time-wait */
+#define TCP_DISABLE_BLACKHOLE_DETECTION 0x209 /* disable PMTU blackhole detection */
+#define TCP_ECN_MODE 0x210 /* fine grain control for A/B testing */
+
+#define ECN_MODE_DEFAULT 0x0 /* per interface or system wide default */
+#define ECN_MODE_ENABLE 0x1 /* force enable ECN on connection */
+#define ECN_MODE_DISABLE 0x2 /* force disable ECN on connection */
+
+/*
+ * The TCP_INFO socket option is a private API and is subject to change
+ */
+#pragma pack(4)
+
+#define TCPI_OPT_TIMESTAMPS 0x01
+#define TCPI_OPT_SACK 0x02
+#define TCPI_OPT_WSCALE 0x04
+#define TCPI_OPT_ECN 0x08
+
+#define TCPI_FLAG_LOSSRECOVERY 0x01 /* Currently in loss recovery */
+
+struct tcp_conn_status {
+ unsigned int probe_activated : 1;
+ unsigned int write_probe_failed : 1;
+ unsigned int read_probe_failed : 1;
+ unsigned int conn_probe_failed : 1;
+};
+
+/*
+ * Add new fields to this structure at the end only. This will preserve
+ * binary compatibility.
+ */
+struct tcp_info {
+ u_int8_t tcpi_state; /* TCP FSM state. */
+ u_int8_t tcpi_options; /* Options enabled on conn. */
+ u_int8_t tcpi_snd_wscale; /* RFC1323 send shift value. */
+ u_int8_t tcpi_rcv_wscale; /* RFC1323 recv shift value. */
+
+ u_int32_t tcpi_flags; /* extra flags (TCPI_FLAG_xxx) */
+
+ u_int32_t tcpi_rto; /* Retransmission timeout in milliseconds */
+ u_int32_t tcpi_snd_mss; /* Max segment size for send. */
+ u_int32_t tcpi_rcv_mss; /* Max segment size for receive. */
+
+ u_int32_t tcpi_rttcur; /* Most recent value of RTT */
+ u_int32_t tcpi_srtt; /* Smoothed RTT */
+ u_int32_t tcpi_rttvar; /* RTT variance */
+ u_int32_t tcpi_rttbest; /* Best RTT we've seen */
+
+ u_int32_t tcpi_snd_ssthresh; /* Slow start threshold. */
+ u_int32_t tcpi_snd_cwnd; /* Send congestion window. */
+
+ u_int32_t tcpi_rcv_space; /* Advertised recv window. */
+
+ u_int32_t tcpi_snd_wnd; /* Advertised send window. */
+ u_int32_t tcpi_snd_nxt; /* Next egress seqno */
+ u_int32_t tcpi_rcv_nxt; /* Next ingress seqno */
+
+ int32_t tcpi_last_outif; /* if_index of interface used to send last */
+ u_int32_t tcpi_snd_sbbytes; /* bytes in snd buffer including data inflight */
+
+ u_int64_t tcpi_txpackets __attribute__((aligned(8))); /* total packets sent */
+ u_int64_t tcpi_txbytes __attribute__((aligned(8)));
+ /* total bytes sent */
+ u_int64_t tcpi_txretransmitbytes __attribute__((aligned(8)));
+ /* total bytes retransmitted */
+ u_int64_t tcpi_txunacked __attribute__((aligned(8)));
+ /* current number of bytes not acknowledged */
+ u_int64_t tcpi_rxpackets __attribute__((aligned(8))); /* total packets received */
+ u_int64_t tcpi_rxbytes __attribute__((aligned(8)));
+ /* total bytes received */
+ u_int64_t tcpi_rxduplicatebytes __attribute__((aligned(8)));
+ /* total duplicate bytes received */
+ u_int64_t tcpi_rxoutoforderbytes __attribute__((aligned(8)));
+ /* total out of order bytes received */
+ u_int64_t tcpi_snd_bw __attribute__((aligned(8))); /* measured send bandwidth in bits/sec */
+ u_int8_t tcpi_synrexmits; /* Number of syn retransmits before connect */
+ u_int8_t tcpi_unused1;
+ u_int16_t tcpi_unused2;
+ u_int64_t tcpi_cell_rxpackets __attribute((aligned(8))); /* packets received over cellular */
+ u_int64_t tcpi_cell_rxbytes __attribute((aligned(8))); /* bytes received over cellular */
+ u_int64_t tcpi_cell_txpackets __attribute((aligned(8))); /* packets transmitted over cellular */
+ u_int64_t tcpi_cell_txbytes __attribute((aligned(8))); /* bytes transmitted over cellular */
+ u_int64_t tcpi_wifi_rxpackets __attribute((aligned(8))); /* packets received over Wi-Fi */
+ u_int64_t tcpi_wifi_rxbytes __attribute((aligned(8))); /* bytes received over Wi-Fi */
+ u_int64_t tcpi_wifi_txpackets __attribute((aligned(8))); /* packets transmitted over Wi-Fi */
+ u_int64_t tcpi_wifi_txbytes __attribute((aligned(8))); /* bytes transmitted over Wi-Fi */
+ u_int64_t tcpi_wired_rxpackets __attribute((aligned(8))); /* packets received over Wired */
+ u_int64_t tcpi_wired_rxbytes __attribute((aligned(8))); /* bytes received over Wired */
+ u_int64_t tcpi_wired_txpackets __attribute((aligned(8))); /* packets transmitted over Wired */
+ u_int64_t tcpi_wired_txbytes __attribute((aligned(8))); /* bytes transmitted over Wired */
+ struct tcp_conn_status tcpi_connstatus; /* status of connection probes */
+
+ u_int16_t /* Client-side information */
+ tcpi_tfo_cookie_req:1, /* Cookie requested? */
+ tcpi_tfo_cookie_rcv:1, /* Cookie received? */
+ tcpi_tfo_syn_loss:1, /* Fallback to reg. TCP after SYN-loss */
+ tcpi_tfo_syn_data_sent:1, /* SYN+data has been sent out */
+ tcpi_tfo_syn_data_acked:1, /* SYN+data has been fully acknowledged */
+ /* And the following are for server-side information (must be set on the listener socket) */
+ tcpi_tfo_syn_data_rcv:1, /* Server received SYN+data with a valid cookie */
+ tcpi_tfo_cookie_req_rcv:1, /* Server received cookie-request */
+ tcpi_tfo_cookie_sent:1, /* Server announced cookie */
+ tcpi_tfo_cookie_invalid:1; /* Server received an invalid cookie */
+
+ u_int16_t tcpi_ecn_client_setup:1, /* Attempted ECN setup from client side */
+ tcpi_ecn_server_setup:1, /* Attempted ECN setup from server side */
+ tcpi_ecn_success:1, /* peer negotiated ECN */
+ tcpi_ecn_lost_syn:1, /* Lost SYN with ECN setup */
+ tcpi_ecn_lost_synack:1, /* Lost SYN-ACK with ECN setup */
+ tcpi_local_peer:1, /* Local to the host or the subnet */
+ tcpi_if_cell:1, /* Interface is cellular */
+ tcpi_if_wifi:1; /* Interface is WiFi */
+
+ u_int32_t tcpi_ecn_recv_ce; /* Packets received with CE */
+ u_int32_t tcpi_ecn_recv_cwr; /* Packets received with CWR */
+
+ u_int32_t tcpi_rcvoopack; /* out-of-order packets received */
+ u_int32_t tcpi_pawsdrop; /* segments dropped due to PAWS */
+ u_int32_t tcpi_sack_recovery_episode; /* SACK recovery episodes */
+ u_int32_t tcpi_reordered_pkts; /* packets reorderd */
+ u_int32_t tcpi_dsack_sent; /* Sent DSACK notification */
+ u_int32_t tcpi_dsack_recvd; /* Received a valid DSACK option */
+ u_int32_t tcpi_flowhash; /* Unique id for the connection */
+};
+
+struct tcp_measure_bw_burst {
+ u_int32_t min_burst_size; /* Minimum number of packets to use */
+ u_int32_t max_burst_size; /* Maximum number of packets to use */
+};
+
+/*
+ * Note that IPv6 link local addresses should have the appropriate scope ID
+ */
+
+struct info_tuple {
+ u_int8_t itpl_proto;
+ union {
+ struct sockaddr _itpl_sa;
+ struct sockaddr_in _itpl_sin;
+ struct sockaddr_in6 _itpl_sin6;
+ } itpl_localaddr;
+ union {
+ struct sockaddr _itpl_sa;
+ struct sockaddr_in _itpl_sin;
+ struct sockaddr_in6 _itpl_sin6;
+ } itpl_remoteaddr;
+};
+
+#define itpl_local_sa itpl_localaddr._itpl_sa
+#define itpl_local_sin itpl_localaddr._itpl_sin
+#define itpl_local_sin6 itpl_localaddr._itpl_sin6
+#define itpl_remote_sa itpl_remoteaddr._itpl_sa
+#define itpl_remote_sin itpl_remoteaddr._itpl_sin
+#define itpl_remote_sin6 itpl_remoteaddr._itpl_sin6
+
+/*
+ * TCP connection info auxiliary data (CIAUX_TCP)
+ *
+ * Do not add new fields to this structure, just add them to tcp_info
+ * structure towards the end. This will preserve binary compatibility.
+ */
+typedef struct conninfo_tcp {
+ pid_t tcpci_peer_pid; /* loopback peer PID if > 0 */
+ struct tcp_info tcpci_tcp_info; /* TCP info */
+} conninfo_tcp_t;
+
+#pragma pack()
+
+#endif /* PRIVATE */
+
+struct tcp_connection_info {
+ u_int8_t tcpi_state; /* connection state */
+ u_int8_t tcpi_snd_wscale; /* Window scale for send window */
+ u_int8_t tcpi_rcv_wscale; /* Window scale for receive window */
+ u_int8_t __pad1;
+ u_int32_t tcpi_options; /* TCP options supported */
+#define TCPCI_OPT_TIMESTAMPS 0x00000001 /* Timestamps enabled */
+#define TCPCI_OPT_SACK 0x00000002 /* SACK enabled */
+#define TCPCI_OPT_WSCALE 0x00000004 /* Window scaling enabled */
+#define TCPCI_OPT_ECN 0x00000008 /* ECN enabled */
+ u_int32_t tcpi_flags; /* flags */
+#define TCPCI_FLAG_LOSSRECOVERY 0x00000001
+#define TCPCI_FLAG_REORDERING_DETECTED 0x00000002
+ u_int32_t tcpi_rto; /* retransmit timeout in ms */
+ u_int32_t tcpi_maxseg; /* maximum segment size supported */
+ u_int32_t tcpi_snd_ssthresh; /* slow start threshold in bytes */
+ u_int32_t tcpi_snd_cwnd; /* send congestion window in bytes */
+ u_int32_t tcpi_snd_wnd; /* send widnow in bytes */
+ u_int32_t tcpi_snd_sbbytes; /* bytes in send socket buffer, including in-flight data */
+ u_int32_t tcpi_rcv_wnd; /* receive window in bytes*/
+ u_int32_t tcpi_rttcur; /* most recent RTT in ms */
+ u_int32_t tcpi_srtt; /* average RTT in ms */
+ u_int32_t tcpi_rttvar; /* RTT variance */
+ u_int32_t
+ /* Client-side information */
+ tcpi_tfo_cookie_req:1, /* Cookie requested? */
+ tcpi_tfo_cookie_rcv:1, /* Cookie received? */
+ tcpi_tfo_syn_loss:1, /* Fallback to reg. TCP after SYN-loss */
+ tcpi_tfo_syn_data_sent:1, /* SYN+data has been sent out */
+ tcpi_tfo_syn_data_acked:1, /* SYN+data has been fully acknowledged */
+ /* And the following are for server-side information (must be set on the listener socket) */
+ tcpi_tfo_syn_data_rcv:1, /* Server received SYN+data with a valid cookie */
+ tcpi_tfo_cookie_req_rcv:1, /* Server received cookie-request */
+ tcpi_tfo_cookie_sent:1, /* Server announced cookie */
+ tcpi_tfo_cookie_invalid:1, /* Server received an invalid cookie */
+ __pad2:23;
+ u_int64_t tcpi_txpackets __attribute__((aligned(8)));
+ u_int64_t tcpi_txbytes __attribute__((aligned(8)));
+ u_int64_t tcpi_txretransmitbytes __attribute__((aligned(8)));
+ u_int64_t tcpi_rxpackets __attribute__((aligned(8)));
+ u_int64_t tcpi_rxbytes __attribute__((aligned(8)));
+ u_int64_t tcpi_rxoutoforderbytes __attribute__((aligned(8)));
+};
+#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */
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