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fix: check either ip_tables or nf_tables #577

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Merged
vvoland merged 1 commit into from
Sep 4, 2026
+19 −3
Merged

fix: check either ip_tables or nf_tables #577

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22 changes: 19 additions & 3 deletions rootless-install.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -157,7 +157,8 @@ yum -y install shadow-utils46-newxidmap"
fi

# iptables dependency check
if [ -z "$SKIP_IPTABLES" ] && ! command -v iptables >/dev/null 2>&1 && [ ! -f /sbin/iptables ] && [ ! -f /usr/sbin/iptables ]; then
iptables_command=$(PATH=$PATH:/sbin:/usr/sbin command -v iptables 2> /dev/null) || :
if [ -z "$SKIP_IPTABLES" ] && [ -z "$iptables_command" ]; then
if command -v apt-get >/dev/null 2>&1; then
INSTRUCTIONS="${INSTRUCTIONS}
apt-get -y install iptables"
Expand All @@ -171,9 +172,24 @@ dnf -y install iptables"
fi

# ip_tables module dependency check
if [ -z "$SKIP_IPTABLES" ] && ! lsmod | grep ip_tables >/dev/null 2>&1 && ! grep -q ip_tables "/lib/modules/$(uname -r)/modules.builtin"; then
#
# some systems use nf_tables instead of ip_tables
# so we set nf_tables as the default and check iptables --version
# to find out if client is using nf_tables
# note that iptables --version doesn't check currently loaded
# modules, it just outputs what it was compiled for
# we do not check further to avoid complex logic
#
# https://github.com/moby/moby/blob/864598f8c2677189e308eb4a3b3c0dd41fc06599/contrib/dockerd-rootless-setuptool.sh
# uses the same logic
iptables_module="nf_tables"
if [ -z "$SKIP_IPTABLES" ] && [ -n "$iptables_command" ] && "$iptables_command" --version | grep -q "legacy"; then
iptables_module="ip_tables"
fi

if [ -z "$SKIP_IPTABLES" ] && ! lsmod | grep -q "$iptables_module" && ! grep -q "$iptables_module" "/lib/modules/$(uname -r)/modules.builtin"; then
INSTRUCTIONS="${INSTRUCTIONS}
modprobe ip_tables"
modprobe $iptables_module"
fi

# debian requires setting unprivileged_userns_clone
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