Commit c59d72d0 authored by Florian Westphal's avatar Florian Westphal Committed by Jakub Kicinski
Browse files

selftests: netfilter: nft_flowtable.sh: make first pass deterministic 



The CI occasionaly encounters a failing test run.  Example:
 # PASS: ipsec tunnel mode for ns1/ns2
 # re-run with random mtus: -o 10966 -l 19499 -r 31322
 # PASS: flow offloaded for ns1/ns2
[..]
 # FAIL: ipsec tunnel ... counter 1157059 exceeds expected value 878489

This script will re-exec itself, on the second run, random MTUs are
chosen for the involved links.  This is done so we can cover different
combinations (large mtu on client, small on server, link has lowest
mtu, etc).

Furthermore, file size is random, even for the first run.

Rework this script and always use the same file size on initial run so
that at least the first round can be expected to have reproducible
behavior.

Second round will use random mtu/filesize.

Raise the failure limit to that of the file size, this should avoid all
errneous test errors.  Currently, first fin will remove the offload, so if
one peer is already closing remaining data is handled by classic path,
which result in larger-than-expected counter and a test failure.

Given packet path also counts tcp/ip headers, in case offload is
completely broken this test will still fail (as expected).

The test counter limit could be made more strict again in the future
once flowtable can keep a connection in offloaded state until FINs
in both directions were seen.

Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Reviewed-by: default avatarSimon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241022152324.13554-1-fw@strlen.de


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 7515e37b

tools/testing/selftests/net/netfilter/nft_flowtable.sh

+21 −18
Original line number Diff line number Diff line
@@ -71,6 +71,8 @@ omtu=9000 
lmtu=1500

rmtu=2000



filesize=$((2 * 1024 * 1024))



usage(){

	echo "nft_flowtable.sh [OPTIONS]"

	echo
@@ -81,12 +83,13 @@ usage(){ 
	exit 1

}



while getopts "o:l:r:" o

while getopts "o:l:r:s:" o

do

	case $o in

		o) omtu=$OPTARG;;

		l) lmtu=$OPTARG;;

		r) rmtu=$OPTARG;;

		s) filesize=$OPTARG;;

		*) usage;;

	esac

done
@@ -217,18 +220,10 @@ ns2out=$(mktemp) 


make_file()

{

	name=$1



	SIZE=$((RANDOM % (1024 * 128)))

	SIZE=$((SIZE + (1024 * 8)))

	TSIZE=$((SIZE * 1024))



	dd if=/dev/urandom of="$name" bs=1024 count=$SIZE 2> /dev/null

	name="$1"

	sz="$2"



	SIZE=$((RANDOM % 1024))

	SIZE=$((SIZE + 128))

	TSIZE=$((TSIZE + SIZE))

	dd if=/dev/urandom conf=notrunc of="$name" bs=1 count=$SIZE 2> /dev/null

	head -c "$sz" < /dev/urandom > "$name"

}



check_counters()
@@ -246,18 +241,18 @@ check_counters() 
	local fs

	fs=$(du -sb "$nsin")

	local max_orig=${fs%%/*}

	local max_repl=$((max_orig/4))

	local max_repl=$((max_orig))



	# flowtable fastpath should bypass normal routing one, i.e. the counters in forward hook

	# should always be lower than the size of the transmitted file (max_orig).

	if [ "$orig_cnt" -gt "$max_orig" ];then

		echo "FAIL: $what: original counter $orig_cnt exceeds expected value $max_orig" 1>&2

		echo "FAIL: $what: original counter $orig_cnt exceeds expected value $max_orig, reply counter $repl_cnt" 1>&2

		ret=1

		ok=0

	fi



	if [ "$repl_cnt" -gt $max_repl ];then

		echo "FAIL: $what: reply counter $repl_cnt exceeds expected value $max_repl" 1>&2

		echo "FAIL: $what: reply counter $repl_cnt exceeds expected value $max_repl, original counter $orig_cnt" 1>&2

		ret=1

		ok=0

	fi
@@ -455,7 +450,7 @@ test_tcp_forwarding_nat() 
	return $lret

}



make_file "$nsin"

make_file "$nsin" "$filesize"



# First test:

# No PMTU discovery, nsr1 is expected to fragment packets from ns1 to ns2 as needed.
@@ -664,8 +659,16 @@ if [ "$1" = "" ]; then 
	l=$(((RANDOM%mtu) + low))

	r=$(((RANDOM%mtu) + low))



	echo "re-run with random mtus: -o $o -l $l -r $r"

	$0 -o "$o" -l "$l" -r "$r"

	MINSIZE=$((2 *  1000 * 1000))

	MAXSIZE=$((64 * 1000 * 1000))



	filesize=$(((RANDOM * RANDOM) % MAXSIZE))

	if [ "$filesize" -lt "$MINSIZE" ]; then

		filesize=$((filesize+MINSIZE))

	fi



	echo "re-run with random mtus and file size: -o $o -l $l -r $r -s $filesize"

	$0 -o "$o" -l "$l" -r "$r" -s "$filesize"

fi



exit $ret