X-Git-Url: http://git.ozo.com/?a=blobdiff_plain;f=bcp38%2Ffiles%2Frun.sh;fp=bcp38%2Ffiles%2Frun.sh;h=33ec5313dcebd328d6e9185ea8e49a37af36db97;hb=fd30ce0fc565a08a3091c983f6de018a42d8c344;hp=0000000000000000000000000000000000000000;hpb=0af5c75f79529e6d0e242c55fb0b17f536c19e5e;p=lede-routing%2F.git

diff --git a/bcp38/files/run.sh b/bcp38/files/run.sh
new file mode 100755
index 0000000..33ec531
--- /dev/null
+++ b/bcp38/files/run.sh
@@ -0,0 +1,96 @@
+#!/bin/sh
+
+STOP=$1
+IPSET_NAME=bcp38-ipv4
+IPTABLES_CHAIN=BCP38
+
+. /lib/functions.sh
+
+config_load bcp38
+
+add_bcp38_rule()
+{
+	local subnet="$1"
+	local action="$2"
+
+	if [ "$action" == "nomatch" ]; then
+		ipset add "$IPSET_NAME" "$subnet" nomatch
+	else
+		ipset add "$IPSET_NAME" "$subnet"
+	fi
+}
+
+detect_upstream()
+{
+	local interface="$1"
+
+	subnets=$(ip route show dev "$interface"  | grep 'scope link' | awk '{print $1}')
+	for subnet in $subnets; do
+		# ipset test doesn't work for subnets, so strip out the subnet part
+		# and test for that; add as exception if there's a match
+		addr=$(echo $subnet | sed 's|/[0-9]\+$||')
+		ipset test "$IPSET_NAME" $addr 2>/dev/null && add_bcp38_rule $subnet nomatch
+	done
+}
+
+run() {
+    	local section="$1"
+    	local enabled
+	local interface
+	local detect_upstream
+	config_get_bool enabled "$section" enabled 0
+	config_get interface "$section" interface
+	config_get detect_upstream "$section" detect_upstream
+
+	if [ "$enabled" -eq "1" -a -n "$interface" -a -z "$STOP" ] ; then
+		setup_ipset
+		setup_iptables "$interface"
+		config_list_foreach "$section" match add_bcp38_rule match
+		config_list_foreach "$section" nomatch add_bcp38_rule nomatch
+		[ "$detect_upstream" -eq "1" ] && detect_upstream "$interface"
+	fi
+	exit 0
+}
+
+setup_ipset()
+{
+	ipset create "$IPSET_NAME" hash:net family ipv4
+	ipset flush "$IPSET_NAME"
+}
+
+setup_iptables()
+{
+	local interface="$1"
+	iptables -N "$IPTABLES_CHAIN" 2>/dev/null
+	iptables -F "$IPTABLES_CHAIN" 2>/dev/null
+
+	iptables -I output_rule -j "$IPTABLES_CHAIN"
+	iptables -I input_rule -j "$IPTABLES_CHAIN"
+	iptables -I forwarding_rule -j "$IPTABLES_CHAIN"
+
+	# always accept DHCP traffic
+	iptables -A "$IPTABLES_CHAIN" -p udp --dport 67:68 --sport 67:68 -j RETURN
+	iptables -A "$IPTABLES_CHAIN" -o "$interface" -m set --match-set "$IPSET_NAME" dst -j REJECT --reject-with icmp-net-unreachable
+	iptables -A "$IPTABLES_CHAIN" -i "$interface" -m set --match-set "$IPSET_NAME" src -j DROP
+}
+
+destroy_ipset()
+{
+	ipset flush "$IPSET_NAME" 2>/dev/null
+	ipset destroy "$IPSET_NAME" 2>/dev/null
+}
+
+destroy_iptables()
+{
+	iptables -D output_rule -j "$IPTABLES_CHAIN" 2>/dev/null
+	iptables -D input_rule -j "$IPTABLES_CHAIN" 2>/dev/null
+	iptables -D forwarding_rule -j "$IPTABLES_CHAIN" 2>/dev/null
+	iptables -F "$IPTABLES_CHAIN" 2>/dev/null
+	iptables -X "$IPTABLES_CHAIN" 2>/dev/null
+}
+
+destroy_iptables
+destroy_ipset
+config_foreach run bcp38
+
+exit 0