---
title: tcp_connection_info
framework: Kernel
role: symbol
platforms: [macOS 10.11+]
path: kernel/tcp_connection_info
---

# tcp_connection_info

## Declaration

```occ
struct tcp_connection_info {
    ...
};
```

## Topics

### Instance Properties

- [tcpi_flags](kernel/tcp_connection_info/1562010-tcpi_flags.md)
- [tcpi_maxseg](kernel/tcp_connection_info/1561947-tcpi_maxseg.md)
- [tcpi_options](kernel/tcp_connection_info/1561987-tcpi_options.md)
- [tcpi_rcv_wnd](kernel/tcp_connection_info/1562056-tcpi_rcv_wnd.md)
- [tcpi_rcv_wscale](kernel/tcp_connection_info/1561988-tcpi_rcv_wscale.md)
- [tcpi_rto](kernel/tcp_connection_info/1561952-tcpi_rto.md)
- [tcpi_rttcur](kernel/tcp_connection_info/1561959-tcpi_rttcur.md)
- [tcpi_rttvar](kernel/tcp_connection_info/1562009-tcpi_rttvar.md)
- [tcpi_rxbytes](kernel/tcp_connection_info/1562000-tcpi_rxbytes.md)
- [tcpi_rxoutoforderbytes](kernel/tcp_connection_info/1562055-tcpi_rxoutoforderbytes.md)
- [tcpi_rxpackets](kernel/tcp_connection_info/1561995-tcpi_rxpackets.md)
- [tcpi_snd_cwnd](kernel/tcp_connection_info/1562053-tcpi_snd_cwnd.md)
- [tcpi_snd_sbbytes](kernel/tcp_connection_info/1562016-tcpi_snd_sbbytes.md)
- [tcpi_snd_ssthresh](kernel/tcp_connection_info/1562003-tcpi_snd_ssthresh.md)
- [tcpi_snd_wnd](kernel/tcp_connection_info/1562043-tcpi_snd_wnd.md)
- [tcpi_snd_wscale](kernel/tcp_connection_info/1561999-tcpi_snd_wscale.md)
- [tcpi_srtt](kernel/tcp_connection_info/1561991-tcpi_srtt.md)
- [tcpi_state](kernel/tcp_connection_info/1562011-tcpi_state.md)
- [tcpi_tfo_cookie_invalid](kernel/tcp_connection_info/1562006-tcpi_tfo_cookie_invalid.md)
- [tcpi_tfo_cookie_rcv](kernel/tcp_connection_info/1561974-tcpi_tfo_cookie_rcv.md)
- [tcpi_tfo_cookie_req](kernel/tcp_connection_info/1561981-tcpi_tfo_cookie_req.md)
- [tcpi_tfo_cookie_req_rcv](kernel/tcp_connection_info/1561945-tcpi_tfo_cookie_req_rcv.md)
- [tcpi_tfo_cookie_sent](kernel/tcp_connection_info/1561960-tcpi_tfo_cookie_sent.md)
- [tcpi_tfo_syn_data_acked](kernel/tcp_connection_info/1561967-tcpi_tfo_syn_data_acked.md)
- [tcpi_tfo_syn_data_rcv](kernel/tcp_connection_info/1562002-tcpi_tfo_syn_data_rcv.md)
- [tcpi_tfo_syn_data_sent](kernel/tcp_connection_info/1562036-tcpi_tfo_syn_data_sent.md)
- [tcpi_tfo_syn_loss](kernel/tcp_connection_info/1561976-tcpi_tfo_syn_loss.md)
- [tcpi_txbytes](kernel/tcp_connection_info/1561963-tcpi_txbytes.md)
- [tcpi_txpackets](kernel/tcp_connection_info/1562012-tcpi_txpackets.md)
- [tcpi_txretransmitbytes](kernel/tcp_connection_info/1561996-tcpi_txretransmitbytes.md)
- [tcpi_tfo_cookie_wrong](kernel/tcp_connection_info/1643356-tcpi_tfo_cookie_wrong.md)
- [tcpi_tfo_heuristics_disable](kernel/tcp_connection_info/1643357-tcpi_tfo_heuristics_disable.md)
- [tcpi_tfo_no_cookie_rcv](kernel/tcp_connection_info/1643359-tcpi_tfo_no_cookie_rcv.md)
- [tcpi_tfo_recv_blackhole](kernel/tcp_connection_info/1643360-tcpi_tfo_recv_blackhole.md)
- [tcpi_tfo_send_blackhole](kernel/tcp_connection_info/1643358-tcpi_tfo_send_blackhole.md)
- [tcpi_txretransmitpackets](kernel/tcp_connection_info/2823952-tcpi_txretransmitpackets.md)
- [tcpi_tfo_onebyte_proxy](kernel/tcp_connection_info/2921515-tcpi_tfo_onebyte_proxy.md)