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#!/bin/bash -e
SETUP="*filter
:FORWARD ACCEPT [13:37]
-A FORWARD -c 1 2 -j ACCEPT
-A FORWARD -c 3 4 -j ACCEPT
COMMIT"
### -Z with index shall zero a single chain only
EXPECT="-P FORWARD ACCEPT -c 13 37
-A FORWARD -c 0 0 -j ACCEPT
-A FORWARD -c 3 4 -j ACCEPT"
$XT_MULTI iptables-restore --counters <<< "$SETUP"
$XT_MULTI iptables -Z FORWARD 1
diff -u <(echo "$EXPECT") <($XT_MULTI iptables -vS FORWARD)
### -Z without index shall zero the chain and all rules
EXPECT="-P FORWARD ACCEPT -c 0 0
-A FORWARD -c 0 0 -j ACCEPT
-A FORWARD -c 0 0 -j ACCEPT"
$XT_MULTI iptables -Z FORWARD
diff -u <(echo "$EXPECT") <($XT_MULTI iptables -vS FORWARD)
### prepare for live test
# iptables-nft will create output chain on demand, so make sure it exists
$XT_MULTI iptables -A OUTPUT -d 127.2.3.4 -j ACCEPT
# test runs in its own netns, lo is there but down by default
ip link set lo up
### pings (and pongs) hit OUTPUT policy, its counters must increase
get_pkt_counter() { # (CHAIN)
$XT_MULTI iptables -vS $1 | awk '/^-P '$1'/{print $5; exit}'
}
counter_inc_test() {
pkt_pre=$(get_pkt_counter OUTPUT)
ping -q -i 0.2 -c 3 127.0.0.1
pkt_post=$(get_pkt_counter OUTPUT)
[[ $pkt_post -gt $pkt_pre ]]
}
counter_inc_test
# iptables-nft-restore needed --counters to create chains with them
if [[ $XT_MULTI == *xtables-nft-multi ]]; then
$XT_MULTI iptables -F OUTPUT
$XT_MULTI iptables -X OUTPUT
$XT_MULTI iptables-restore <<EOF
*filter
:OUTPUT ACCEPT [0:0]
COMMIT
EOF
counter_inc_test
fi
### unrelated restore must not touch changing counters in kernel
# With legacy iptables, this works without --noflush even. With iptables-nft,
# ruleset is flushed though. Not sure which behaviour is actually correct. :)
pkt_pre=$pkt_post
$XT_MULTI iptables-restore --noflush <<EOF
*filter$(ping -i 0.2 -c 3 127.0.0.1 >/dev/null 2>&1)
COMMIT
EOF
nft list ruleset
pkt_post=$(get_pkt_counter OUTPUT)
[[ $pkt_post -eq $((pkt_pre + 6 )) ]]
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