Family tcp_metrics netlink specification

Summary

Management interface for TCP metrics.

Operations

get

Retrieve metrics.

attribute-set:

tcp-metrics

dont-validate:

[‘strict’, ‘dump’]

do:

request

attributes:

[addr-ipv4, addr-ipv6, saddr-ipv4, saddr-ipv6]

reply

attributes:

[addr-ipv4, addr-ipv6, saddr-ipv4, saddr-ipv6, age, vals, fopen-mss, fopen-syn-drops, fopen-syn-drop-ts, fopen-cookie]

dump:

reply

attributes:

[addr-ipv4, addr-ipv6, saddr-ipv4, saddr-ipv6, age, vals, fopen-mss, fopen-syn-drops, fopen-syn-drop-ts, fopen-cookie]

del

Delete metrics.

attribute-set:

tcp-metrics

dont-validate:

[‘strict’, ‘dump’]

flags:

[admin-perm]

do:

request

attributes:

[addr-ipv4, addr-ipv6, saddr-ipv4, saddr-ipv6]

Definitions

tcp-fastopen-cookie-max

type:

const

value:

16

Attribute sets

tcp-metrics

addr-ipv4 (u32)

byte-order:

big-endian

display-hint:

ipv4

addr-ipv6 (binary)

byte-order:

big-endian

display-hint:

ipv6

age (u64)

tw-tsval (u32)

doc:

unused

tw-ts-stamp (s32)

doc:

unused

vals (nest)

nested-attributes:

metrics

fopen-mss (u16)

fopen-syn-drops (u16)

fopen-syn-drop-ts (u64)

fopen-cookie (binary)

saddr-ipv4 (u32)

byte-order:

big-endian

display-hint:

ipv4

saddr-ipv6 (binary)

byte-order:

big-endian

display-hint:

ipv6

pad (pad)

metrics

rtt (u32)

doc:

Round Trip Time (RTT), in msecs with 3 bits fractional (left-shift by 3 to get the msec value).

rttvar (u32)

doc:

Round Trip Time VARiance (RTT), in msecs with 2 bits fractional (left-shift by 2 to get the msec value).

ssthresh (u32)

doc:

Slow Start THRESHold.

cwnd (u32)

doc:

Congestion Window.

reodering (u32)

doc:

Reodering metric.

rtt-us (u32)

doc:

Round Trip Time (RTT), in usecs, with 3 bits fractional (left-shift by 3 to get the msec value).

rttvar-us (u32)

doc:

Round Trip Time (RTT), in usecs, with 2 bits fractional (left-shift by 3 to get the msec value).