Linux kernel: Network packet generator

これも、前から知ってはいたのだが、改めてmake menuconfigしていて再認識した。

各種テスト用にやってみるか。

Network packet generator
CONFIG_NET_PKTGEN
This module will inject preconfigured packets, at a configurable
rate, out of a given interface.  It is used for network interface
stress testing and performance analysis.  If you don't understand
what was just said, you don't need it: say N.
Documentation on how to use the packet generator can be found
at .

$ more pktgen.txt
How to use the Linux packet generator module.
1. Enable CONFIG_NET_PKTGEN to compile and build pktgen.o, install it
in the place where insmod may find it.
2. Cut script "ipg" (see below).
3. Edit script to set preferred device and destination IP address.
3a.  Create more scripts for different interfaces.  Up to thirty-two
pktgen processes can be configured and run at once by using the
32 /proc/net/pktgen/pg* files.
4. Run in shell: ". ipg"
5. After this two commands are defined:
A. "pg" to start generator and to get results.
B. "pgset" to change generator parameters. F.e.
pgset "multiskb 1"      use multiple SKBs for packet generation
pgset "multiskb 0"      use single SKB for all transmits
pgset "pkt_size 9014"   sets packet size to 9014
pgset "frags 5"         packet will consist of 5 fragments
pgset "count 200000"    sets number of packets to send, set to zero
for continious sends untill explicitly
stopped.
pgset "ipg 5000"        sets artificial gap inserted between packets
to 5000 nanoseconds
pgset "dst 10.0.0.1"    sets IP destination address
(BEWARE! This generator is very aggressive!)
pgset "dst_min 10.0.0.1"            Same as dst
pgset "dst_max 10.0.0.254"          Set the maximum destination IP.
pgset "src_min 10.0.0.1"            Set the minimum (or only) source IP.
pgset "src_max 10.0.0.254"          Set the maximum source IP.
pgset "dstmac 00:00:00:00:00:00"    sets MAC destination address
pgset "srcmac 00:00:00:00:00:00"    sets MAC source address
pgset "src_mac_count 1" Sets the number of MACs we'll range through.  The
'minimum' MAC is what you set with srcmac.
pgset "dst_mac_count 1" Sets the number of MACs we'll range through.  The
'minimum' MAC is what you set with dstmac.
pgset "flag [name]"     Set a flag to determine behaviour.  Current flags
are: IPSRC_RND #IP Source is random (between min/max),
IPDST_RND, UDPSRC_RND,
UDPDST_RND, MACSRC_RND, MACDST_RND
pgset "udp_src_min 9"   set UDP source port min, If < udp_src_max, then
cycle through the port range.
pgset "udp_src_max 9"   set UDP source port max.
pgset "udp_dst_min 9"   set UDP destination port min, If < udp_dst_max, then
cycle through the port range.
pgset "udp_dst_max 9"   set UDP destination port max.
pgset stop              aborts injection
Also, ^C aborts generator.
---- cut here
#! /bin/sh
modprobe pktgen
PGDEV=/proc/net/pktgen/pg0
function pgset() {
local result
echo $1 > $PGDEV
result=`cat $PGDEV | fgrep "Result: OK:"`
if [ "$result" = "" ]; then
cat $PGDEV | fgrep Result:
fi
}
function pg() {
echo inject > $PGDEV
cat $PGDEV
}
pgset "odev eth0"
pgset "dst 0.0.0.0"
---- cut here