selftests: netfilter: nft_concat_range.sh: add datapath check for map fill bug

commit 0935ee6 ("selftests: netfilter: add test case for recent mismatch bug")
added a regression check for incorrect initial fill of the result map
that was fixed with 791a615 ("netfilter: nf_set_pipapo: fix initial map fill").

The test used 'nft get element', i.e., control plane checks for
match/nomatch results.

The control plane however doesn't use avx2 version, so we need to
send+match packets.

As the additional packet match/nomatch is slow, don't do this for
every element added/removed: add and use maybe_send_(no)match
helpers and use them.

Signed-off-by: Florian Westphal <[email protected]>
Reviewed-by: Stefano Brivio <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>

Author: Florian Westphal

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

@@ -378,7 +378,7 @@ display		net,port,proto
 type_spec	ipv4_addr . inet_service . inet_proto
 chain_spec	ip daddr . udp dport . meta l4proto
 dst		addr4 port proto
-src
+src		 
 start		1
 count		9
 src_delta	9
@@ -1269,6 +1269,42 @@ send_nomatch() {
 	fi
 }
 
+maybe_send_nomatch() {
+	local elem="$1"
+	local what="$4"
+
+	[ $((RANDOM%20)) -gt 0 ] && return
+
+	dst_addr4="$2"
+	dst_port="$3"
+	send_udp
+
+	if [ "$(count_packets_nomatch)" != "0" ]; then
+		err "Packet to $dst_addr4:$dst_port did match $what"
+		err "$(nft -a list ruleset)"
+		return 1
+	fi
+}
+
+maybe_send_match() {
+	local elem="$1"
+	local what="$4"
+
+	[ $((RANDOM%20)) -gt 0 ] && return
+
+	dst_addr4="$2"
+	dst_port="$3"
+	send_udp
+
+	if [ "$(count_packets "{ $elem }")" != "1" ]; then
+		err "Packet to $dst_addr4:$dst_port did not match $what"
+		err "$(nft -a list ruleset)"
+		return 1
+	fi
+	nft reset counter inet filter test >/dev/null
+	nft reset element inet filter test "{ $elem }" >/dev/null
+}
+
 # Correctness test template:
 # - add ranged element, check that packets match it
 # - check that packets outside range don't match it
@@ -1776,39 +1812,55 @@ test_bug_net_port_proto_match() {
 	range_size=1
 	for i in $(seq 1 10); do
 		for j in $(seq 1 20) ; do
-			elem=$(printf "10.%d.%d.0/24 . %d1-%d0 . 6-17 " ${i} ${j} ${i} "$((i+1))")
+			local dport=$j
+
+			elem=$(printf "10.%d.%d.0/24 . %d-%d0 . 6-17 " ${i} ${j} ${dport} "$((dport+1))")
+
+			# too slow, do not test all addresses
+			maybe_send_nomatch "$elem" $(printf "10.%d.%d.1" $i $j) $(printf "%d1" $((dport+1))) "before add" || return 1
 
 			nft "add element inet filter test { $elem }" || return 1
+
+			maybe_send_match "$elem" $(printf "10.%d.%d.1" $i $j) $(printf "%d" $dport) "after add" || return 1
+
 			nft "get element inet filter test { $elem }" | grep -q "$elem"
 			if [ $? -ne 0 ];then
 				local got=$(nft "get element inet filter test { $elem }")
 				err "post-add: should have returned $elem but got $got"
 				return 1
 			fi
+
+			maybe_send_nomatch "$elem" $(printf "10.%d.%d.1" $i $j) $(printf "%d1" $((dport+1))) "out-of-range" || return 1
 		done
 	done
 
 	# recheck after set was filled
 	for i in $(seq 1 10); do
 		for j in $(seq 1 20) ; do
-			elem=$(printf "10.%d.%d.0/24 . %d1-%d0 . 6-17 " ${i} ${j} ${i} "$((i+1))")
+			local dport=$j
+
+			elem=$(printf "10.%d.%d.0/24 . %d-%d0 . 6-17 " ${i} ${j} ${dport} "$((dport+1))")
 
 			nft "get element inet filter test { $elem }" | grep -q "$elem"
 			if [ $? -ne 0 ];then
 				local got=$(nft "get element inet filter test { $elem }")
 				err "post-fill: should have returned $elem but got $got"
 				return 1
 			fi
+
+			maybe_send_match "$elem" $(printf "10.%d.%d.1" $i $j) $(printf "%d" $dport) "recheck" || return 1
+			maybe_send_nomatch "$elem" $(printf "10.%d.%d.1" $i $j) $(printf "%d1" $((dport+1))) "recheck out-of-range" || return 1
 		done
 	done
 
 	# random del and re-fetch
 	for i in $(seq 1 10); do
 		for j in $(seq 1 20) ; do
 			local rnd=$((RANDOM%10))
+			local dport=$j
 			local got=""
 
-			elem=$(printf "10.%d.%d.0/24 . %d1-%d0 . 6-17 " ${i} ${j} ${i} "$((i+1))")
+			elem=$(printf "10.%d.%d.0/24 . %d-%d0 . 6-17 " ${i} ${j} ${dport} "$((dport+1))")
 			if [ $rnd -gt 0 ];then
 				continue
 			fi
@@ -1819,6 +1871,8 @@ test_bug_net_port_proto_match() {
 				err "post-delete: query for $elem returned $got instead of error."
 				return 1
 			fi
+
+			maybe_send_nomatch "$elem" $(printf "10.%d.%d.1" $i $j) $(printf "%d" $dport) "match after deletion" || return 1
 		done
 	done