From a97f29e69b11276cc18793cd696614c367ffc806 Mon Sep 17 00:00:00 2001
From: Phil Sutter <psutter@redhat.com>
Date: Wed, 30 Mar 2016 16:43:19 +0200
Subject: [PATCH] man: Add a man page for the simple action
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1275426
Upstream Status: iproute2.git commit ebf9933bb3d5c
commit ebf9933bb3d5c6a869edb7405f7a4759862409ab
Author: Phil Sutter <phil@nwl.cc>
Date: Fri Mar 4 13:11:42 2016 +0100
man: Add a man page for the simple action
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
man/man8/tc-simple.8 | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
create mode 100644 man/man8/tc-simple.8
diff --git a/man/man8/tc-simple.8 b/man/man8/tc-simple.8
new file mode 100644
index 0000000..2206dc3
--- /dev/null
+++ b/man/man8/tc-simple.8
@@ -0,0 +1,76 @@
+.TH "Simple action in tc" 8 "12 Jan 2015" "iproute2" "Linux"
+
+.SH NAME
+simple - basic example action
+.SH SYNOPSIS
+.in +8
+.ti -8
+.BR tc " ... " "action simple"
+.I STRING
+.SH DESCRIPTION
+This is a pedagogical example rather than an actually useful action. Upon every access, it prints the given
+.I STRING
+which may be of arbitrary length.
+.SH OPTIONS
+.TP
+.I STRING
+The actual string to print.
+.SH EXAMPLES
+The following example makes the kernel yell "Incoming ICMP!" every time it sees
+an incoming ICMP on eth0. Steps are:
+.IP 1) 4
+Add an ingress qdisc point to eth0
+.IP 2) 4
+Start a chain on ingress of eth0 that first matches ICMP then invokes the
+simple action to shout.
+.IP 3) 4
+display stats and show that no packet has been seen by the action
+.IP 4) 4
+Send one ping packet to google (expect to receive a response back)
+.IP 5) 4
+grep the logs to see the logged message
+.IP 6) 4
+display stats again and observe increment by 1
+
+.RE
+.EX
+ hadi@noma1:$ tc qdisc add dev eth0 ingress
+ hadi@noma1:$tc filter add dev eth0 parent ffff: protocol ip prio 5 \\
+ u32 match ip protocol 1 0xff flowid 1:1 action simple "Incoming ICMP"
+
+ hadi@noma1:$ sudo tc -s filter ls dev eth0 parent ffff:
+ filter protocol ip pref 5 u32
+ filter protocol ip pref 5 u32 fh 800: ht divisor 1
+ filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
+ match 00010000/00ff0000 at 8
+ action order 1: Simple <Incoming ICMP>
+ index 4 ref 1 bind 1 installed 29 sec used 29 sec
+ Action statistics:
+ Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
+ backlog 0b 0p requeues 0
+
+
+ hadi@noma1$ ping -c 1 www.google.ca
+ PING www.google.ca (74.125.225.120) 56(84) bytes of data.
+ 64 bytes from ord08s08-in-f24.1e100.net (74.125.225.120): icmp_req=1 ttl=53 time=31.3 ms
+
+ --- www.google.ca ping statistics ---
+ 1 packets transmitted, 1 received, 0% packet loss, time 0ms
+ rtt min/avg/max/mdev = 31.316/31.316/31.316/0.000 ms
+
+ hadi@noma1$ dmesg | grep simple
+ [135354.473951] simple: Incoming ICMP_1
+
+ hadi@noma1$ sudo tc/tc -s filter ls dev eth0 parent ffff:
+ filter protocol ip pref 5 u32
+ filter protocol ip pref 5 u32 fh 800: ht divisor 1
+ filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
+ match 00010000/00ff0000 at 8
+ action order 1: Simple <Incoming ICMP>
+ index 4 ref 1 bind 1 installed 206 sec used 67 sec
+ Action statistics:
+ Sent 84 bytes 1 pkt (dropped 0, overlimits 0 requeues 0)
+ backlog 0b 0p requeues 0
+.EE
+.SH SEE ALSO
+.BR tc (8)
--
1.8.3.1