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85674625e0
Add a protocol spec for tcp_metrics, so that it's accessible via YNL.
Useful at the very least for testing fixes.
In this episode of "10,000 ways to complicate netlink" the metric
nest has defines which are off by 1. iproute2 does:
struct rtattr *m[TCP_METRIC_MAX + 1 + 1];
parse_rtattr_nested(m, TCP_METRIC_MAX + 1, a);
for (i = 0; i < TCP_METRIC_MAX + 1; i++) {
// ...
attr = m[i + 1];
This is too weird to support in YNL, add a new set of defines
with _correct_ values to the official kernel header.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
170 lines
3.6 KiB
YAML
170 lines
3.6 KiB
YAML
# SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
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name: tcp_metrics
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protocol: genetlink-legacy
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doc: |
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Management interface for TCP metrics.
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c-family-name: tcp-metrics-genl-name
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c-version-name: tcp-metrics-genl-version
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max-by-define: true
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kernel-policy: global
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definitions:
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-
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name: tcp-fastopen-cookie-max
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type: const
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value: 16
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attribute-sets:
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-
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name: tcp-metrics
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name-prefix: tcp-metrics-attr-
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attributes:
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-
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name: addr-ipv4
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type: u32
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byte-order: big-endian
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display-hint: ipv4
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-
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name: addr-ipv6
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type: binary
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checks:
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min-len: 16
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byte-order: big-endian
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display-hint: ipv6
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-
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name: age
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type: u64
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-
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name: tw-tsval
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type: u32
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doc: unused
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-
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name: tw-ts-stamp
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type: s32
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doc: unused
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-
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name: vals
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type: nest
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nested-attributes: metrics
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-
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name: fopen-mss
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type: u16
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-
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name: fopen-syn-drops
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type: u16
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-
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name: fopen-syn-drop-ts
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type: u64
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-
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name: fopen-cookie
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type: binary
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checks:
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min-len: tcp-fastopen-cookie-max
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-
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name: saddr-ipv4
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type: u32
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byte-order: big-endian
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display-hint: ipv4
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-
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name: saddr-ipv6
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type: binary
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checks:
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min-len: 16
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byte-order: big-endian
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display-hint: ipv6
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-
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name: pad
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type: pad
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-
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name: metrics
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# Intentionally don't define the name-prefix, see below.
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doc: |
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Attributes with metrics. Note that the values here do not match
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the TCP_METRIC_* defines in the kernel, because kernel defines
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are off-by one (e.g. rtt is defined as enum 0, while netlink carries
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attribute type 1).
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attributes:
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-
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name: rtt
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type: u32
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doc: |
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Round Trip Time (RTT), in msecs with 3 bits fractional
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(left-shift by 3 to get the msec value).
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-
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name: rttvar
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type: u32
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doc: |
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Round Trip Time VARiance (RTT), in msecs with 2 bits fractional
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(left-shift by 2 to get the msec value).
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-
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name: ssthresh
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type: u32
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doc: Slow Start THRESHold.
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-
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name: cwnd
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type: u32
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doc: Congestion Window.
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-
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name: reodering
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type: u32
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doc: Reodering metric.
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-
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name: rtt-us
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type: u32
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doc: |
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Round Trip Time (RTT), in usecs, with 3 bits fractional
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(left-shift by 3 to get the msec value).
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-
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name: rttvar-us
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type: u32
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doc: |
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Round Trip Time (RTT), in usecs, with 2 bits fractional
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(left-shift by 3 to get the msec value).
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operations:
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list:
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-
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name: get
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doc: Retrieve metrics.
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attribute-set: tcp-metrics
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dont-validate: [ strict, dump ]
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do:
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request: &sel_attrs
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attributes:
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- addr-ipv4
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- addr-ipv6
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- saddr-ipv4
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- saddr-ipv6
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reply: &all_attrs
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attributes:
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- addr-ipv4
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- addr-ipv6
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- saddr-ipv4
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- saddr-ipv6
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- age
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- vals
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- fopen-mss
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- fopen-syn-drops
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- fopen-syn-drop-ts
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- fopen-cookie
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dump:
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reply: *all_attrs
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-
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name: del
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doc: Delete metrics.
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attribute-set: tcp-metrics
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dont-validate: [ strict, dump ]
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flags: [ admin-perm ]
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do:
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request: *sel_attrs
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