Family tcp_metrics netlink specification¶
Summary¶
Management interface for TCP metrics.
Operations¶
get¶
Retrieve metrics.
- attribute-set:
- 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:
- dont-validate:
[‘strict’, ‘dump’]
- flags:
[
admin-perm]- do:
- request
- attributes:
[
addr-ipv4,addr-ipv6,saddr-ipv4,saddr-ipv6]
Definitions¶
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:
fopen-mss (u16)¶
fopen-syn-drops (u16)¶
fopen-syn-drop-ts (u64)¶
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).