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wg-quick: linux: add support for nft and prefer it

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If nft(8) is installed, use it. These rules should be identical to the
iptables-restore(8) ones, with the advantage that cleanup is easy
because we use custom table names.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2019-12-10 16:37:34 +01:00
parent bc8bf54185
commit 17c78d31c2
1 changed files with 39 additions and 20 deletions
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37
src/wg-quick/linux.bash
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@ -95,7 +95,7 @@ add_if() {
del_if() {
local table
[[ $HAVE_SET_DNS -eq 0 ]] || unset_dns
[[ $HAVE_SET_IPTABLES -eq 0 ]] || remove_iptables
[[ $HAVE_SET_FIREWALL -eq 0 ]] || remove_firewall
if [[ -z $TABLE || $TABLE == auto ]] && get_fwmark table && [[ $(wg show "$INTERFACE" allowed-ips) =~ /0(\ |$'\n'|$) ]]; then
while [[ $(ip -4 rule show 2>/dev/null) == *"lookup $table"* ]]; do
cmd ip -4 rule delete table $table
@ -181,7 +181,14 @@ get_fwmark() {
return 0
}
remove_iptables() {
remove_firewall() {
if type -p nft >/dev/null; then
local table nftcmd
while read -r table; do
[[ $table == *" wg-quick-$INTERFACE" ]] && printf -v nftcmd '%sdelete %s\n' "$nftcmd" "$table"
done < <(nft list tables 2>/dev/null)
[[ -z $nftcmd ]] || echo -n "$nftcmd" | cmd nft -f -
else
local line iptables found restore
for iptables in iptables ip6tables; do
restore="" found=0
@ -192,11 +199,12 @@ remove_iptables() {
done < <($iptables-save 2>/dev/null)
[[ $found -ne 1 ]] || echo -n "$restore" | cmd $iptables-restore -n
done
fi
}
HAVE_SET_IPTABLES=0
HAVE_SET_FIREWALL=0
add_default() {
local table proto i iptables
local table i
if ! get_fwmark table; then
table=51820
while [[ -n $(ip -4 route show table $table 2>/dev/null) || -n $(ip -6 route show table $table 2>/dev/null) ]]; do
@ -204,21 +212,32 @@ add_default() {
done
cmd wg set "$INTERFACE" fwmark $table
fi
proto=-4 iptables=iptables
[[ $1 == *:* ]] && proto=-6 iptables=ip6tables
local proto=-4 iptables=iptables pf=ip
[[ $1 == *:* ]] && proto=-6 iptables=ip6tables pf=ip6
cmd ip $proto route add "$1" dev "$INTERFACE" table $table
cmd ip $proto rule add not fwmark $table table $table
cmd ip $proto rule add table main suppress_prefixlength 0
local marker="-m comment --comment \"wg-quick(8) rule for $INTERFACE\"" restore=$'*raw\n'
local marker="-m comment --comment \"wg-quick(8) rule for $INTERFACE\"" restore=$'*raw\n' nftable="wg-quick-$INTERFACE" nftcmd
printf -v nftcmd '%sadd table %s %s\n' "$nftcmd" "$pf" "$nftable"
printf -v nftcmd '%sadd chain %s %s preraw { type filter hook prerouting priority raw; }\n' "$nftcmd" "$pf" "$nftable"
printf -v nftcmd '%sadd chain %s %s premangle { type filter hook prerouting priority mangle; }\n' "$nftcmd" "$pf" "$nftable"
printf -v nftcmd '%sadd chain %s %s postmangle { type filter hook postrouting priority mangle; }\n' "$nftcmd" "$pf" "$nftable"
for i in "${ADDRESSES[@]}"; do
[[ ( $proto == -4 && $i != *:* ) || ( $proto == -6 && $i == *:* ) ]] || continue
printf -v restore '%s-I PREROUTING ! -i %s -d %s -m addrtype ! --src-type LOCAL -j DROP %s\n' "$restore" "$INTERFACE" "${i%/*}" "$marker"
printf -v nftcmd '%sadd rule %s %s preraw iifname != %s %s daddr %s fib saddr type != local drop\n' "$nftcmd" "$pf" "$nftable" "$INTERFACE" "$pf" "${i%/*}"
done
printf -v restore '%sCOMMIT\n*mangle\n-I POSTROUTING -m mark --mark %d -p udp -j CONNMARK --save-mark %s\n-I PREROUTING -p udp -j CONNMARK --restore-mark %s\nCOMMIT\n' "$restore" $table "$marker" "$marker"
printf -v nftcmd '%sadd rule %s %s postmangle meta l4proto udp mark %d ct mark set mark \n' "$nftcmd" "$pf" "$nftable" $table
printf -v nftcmd '%sadd rule %s %s premangle meta l4proto udp meta mark set ct mark \n' "$nftcmd" "$pf" "$nftable"
[[ $proto == -4 ]] && cmd sysctl -q net.ipv4.conf.all.src_valid_mark=1
if type -p nft >/dev/null; then
echo -n "$nftcmd" | cmd nft -f -
else
echo -n "$restore" | cmd $iptables-restore -n
HAVE_SET_IPTABLES=1
fi
HAVE_SET_FIREWALL=1
return 0
}
@ -323,7 +342,7 @@ cmd_down() {
[[ $SAVE_CONFIG -eq 0 ]] || save_config
del_if
unset_dns || true
remove_iptables || true
remove_firewall || true
execute_hooks "${POST_DOWN[@]}"
}