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From 7f5707d93a62cf7474d94e038188a0a8ae2924e7 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Wed, 19 May 2021 13:12:48 +0200
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Subject: [PATCH] doc: nft.8: Extend monitor description by trace
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Briefly describe 'nft monitor trace' command functionality.
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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(cherry picked from commit 2acf8b2caea19d8abd46d475a908f8d6afb33aa0)
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---
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doc/nft.txt | 25 ++++++++++++++++++++++---
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1 file changed, 22 insertions(+), 3 deletions(-)
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diff --git a/doc/nft.txt b/doc/nft.txt
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index 2642d8903787f..7b3c70d82a127 100644
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--- a/doc/nft.txt
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+++ b/doc/nft.txt
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@@ -805,13 +805,26 @@ These are some additional commands included in nft.
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MONITOR
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~~~~~~~~
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The monitor command allows you to listen to Netlink events produced by the
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-nf_tables subsystem, related to creation and deletion of objects. When they
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+nf_tables subsystem. These are either related to creation and deletion of
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+objects or to packets for which *meta nftrace* was enabled. When they
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occur, nft will print to stdout the monitored events in either JSON or
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native nft format. +
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-To filter events related to a concrete object, use one of the keywords 'tables', 'chains', 'sets', 'rules', 'elements', 'ruleset'. +
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+[verse]
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+____
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+*monitor* [*new* | *destroy*] 'MONITOR_OBJECT'
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+*monitor* *trace*
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+
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+'MONITOR_OBJECT' := *tables* | *chains* | *sets* | *rules* | *elements* | *ruleset*
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+____
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-To filter events related to a concrete action, use keyword 'new' or 'destroy'.
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+To filter events related to a concrete object, use one of the keywords in
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+'MONITOR_OBJECT'.
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+
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+To filter events related to a concrete action, use keyword *new* or *destroy*.
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+
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+The second form of invocation takes no further options and exclusively prints
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+events generated for packets with *nftrace* enabled.
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Hit ^C to finish the monitor operation.
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@@ -835,6 +848,12 @@ Hit ^C to finish the monitor operation.
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% nft monitor ruleset
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---------------------
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+.Trace incoming packets from host 10.0.0.1
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+------------------------------------------
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+% nft add rule filter input ip saddr 10.0.0.1 meta nftrace set 1
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+% nft monitor trace
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+------------------------------------------
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+
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ERROR REPORTING
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---------------
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When an error is detected, nft shows the line(s) containing the error, the
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--
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2.33.0
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