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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright Red Hat
*
* Largely derived from include/linux/tcp.h in the Linux kernel
*/
#ifndef TCP_INFO_H
#define TCP_INFO_H
/* struct tcp_info_linux - Information from Linux TCP_INFO getsockopt()
*
* Some fields returned by TCP_INFO have been there for ages and are shared with
* BSD. struct tcp_info from netinet/tcp.h has only those fields. There are
* also a many Linux specific extensions to the structure, which are only found
* in the linux/tcp.h version of struct tcp_info.
*
* We want to use some of those extension fields, when available. We can test
* for availability in the runtime kernel using the length returned from
* getsockopt(). However, we won't necessarily be compiled against the same
* kernel headers as we'll run with, so compiling directly against linux/tcp.h
* means wrapping every field access in an #ifdef whose #else does the same
* thing as when the field is missing at runtime. This rapidly gets messy.
*
* Instead we define here struct tcp_info_linux which includes all the Linux
* extensions that we want to use. This is taken from v6.11 of the kernel.
*/
struct tcp_info_linux {
uint8_t tcpi_state;
uint8_t tcpi_ca_state;
uint8_t tcpi_retransmits;
uint8_t tcpi_probes;
uint8_t tcpi_backoff;
uint8_t tcpi_options;
uint8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
uint8_t tcpi_delivery_rate_app_limited:1, tcpi_fastopen_client_fail:2;
uint32_t tcpi_rto;
uint32_t tcpi_ato;
uint32_t tcpi_snd_mss;
uint32_t tcpi_rcv_mss;
uint32_t tcpi_unacked;
uint32_t tcpi_sacked;
uint32_t tcpi_lost;
uint32_t tcpi_retrans;
uint32_t tcpi_fackets;
/* Times. */
uint32_t tcpi_last_data_sent;
uint32_t tcpi_last_ack_sent;
uint32_t tcpi_last_data_recv;
uint32_t tcpi_last_ack_recv;
/* Metrics. */
uint32_t tcpi_pmtu;
uint32_t tcpi_rcv_ssthresh;
uint32_t tcpi_rtt;
uint32_t tcpi_rttvar;
uint32_t tcpi_snd_ssthresh;
uint32_t tcpi_snd_cwnd;
uint32_t tcpi_advmss;
uint32_t tcpi_reordering;
uint32_t tcpi_rcv_rtt;
uint32_t tcpi_rcv_space;
uint32_t tcpi_total_retrans;
/* Linux extensions */
uint64_t tcpi_pacing_rate;
uint64_t tcpi_max_pacing_rate;
uint64_t tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */
uint64_t tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
uint32_t tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
uint32_t tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
uint32_t tcpi_notsent_bytes;
uint32_t tcpi_min_rtt;
uint32_t tcpi_data_segs_in; /* RFC4898 tcpEStatsDataSegsIn */
uint32_t tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */
uint64_t tcpi_delivery_rate;
uint64_t tcpi_busy_time; /* Time (usec) busy sending data */
uint64_t tcpi_rwnd_limited; /* Time (usec) limited by receive window */
uint64_t tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */
uint32_t tcpi_delivered;
uint32_t tcpi_delivered_ce;
uint64_t tcpi_bytes_sent; /* RFC4898 tcpEStatsPerfHCDataOctetsOut */
uint64_t tcpi_bytes_retrans; /* RFC4898 tcpEStatsPerfOctetsRetrans */
uint32_t tcpi_dsack_dups; /* RFC4898 tcpEStatsStackDSACKDups */
uint32_t tcpi_reord_seen; /* reordering events seen */
uint32_t tcpi_rcv_ooopack; /* Out-of-order packets received */
uint32_t tcpi_snd_wnd; /* peer's advertised receive window after
* scaling (bytes)
*/
uint32_t tcpi_rcv_wnd; /* local advertised receive window after
* scaling (bytes)
*/
uint32_t tcpi_rehash; /* PLB or timeout triggered rehash attempts */
uint16_t tcpi_total_rto; /* Total number of RTO timeouts, including
* SYN/SYN-ACK and recurring timeouts.
*/
uint16_t tcpi_total_rto_recoveries; /* Total number of RTO
* recoveries, including any
* unfinished recovery.
*/
uint32_t tcpi_total_rto_time; /* Total time spent in RTO recoveries
* in milliseconds, including any
* unfinished recovery.
*/
};
#endif /* TCP_INFO_H */
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