[openwrt/openwrt] ds-lite: Add support for IPIP6(RFC2473) tunnel

[LEDE Commits]

981213 pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/21eeb45420cf12c6df9b39b619f6579b3ec32bb4

commit 21eeb45420cf12c6df9b39b619f6579b3ec32bb4
Author: Arayuki Mago <ms at missing233.com>
AuthorDate: Tue Feb 13 19:08:50 2024 +0900

    ds-lite: Add support for IPIP6(RFC2473) tunnel
    
    Add Generic Packet Tunneling in IPv6 Specification (RFC 2473) support.
    
    Signed-off-by: Arayuki Mago <ms at missing233.com>
    Signed-off-by: Chuanhong Guo <gch981213 at gmail.com>
---
 package/network/ipv6/ds-lite/Makefile        |  6 +--
 package/network/ipv6/ds-lite/files/dslite.sh | 67 +++++++++++++++++++++-------
 2 files changed, 53 insertions(+), 20 deletions(-)

diff --git a/package/network/ipv6/ds-lite/Makefile b/package/network/ipv6/ds-lite/Makefile
index 502da366a9..37c3449ab2 100644
--- a/package/network/ipv6/ds-lite/Makefile
+++ b/package/network/ipv6/ds-lite/Makefile
@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ds-lite
-PKG_RELEASE:=8
+PKG_RELEASE:=9
 PKG_LICENSE:=GPL-2.0
 
 include $(INCLUDE_DIR)/package.mk
@@ -17,13 +17,13 @@ define Package/ds-lite
   SECTION:=net
   CATEGORY:=Network
   DEPENDS:=@IPV6 +kmod-ip6-tunnel +resolveip
-  TITLE:=Dual-Stack Lite (DS-Lite) configuration support
+  TITLE:=IPv4 over IPv6 (RFC2473 and DS-Lite) configuration support
   MAINTAINER:=Steven Barth <steven at midlink.org>
   PKGARCH:=all
 endef
 
 define Package/ds-lite/description
-Provides support for Dual-Stack Lite in /etc/config/network.
+Provides support for IPv4 over IPv6 (RFC2473 and DS-Lite) in /etc/config/network.
 Refer to http://wiki.openwrt.org/doc/uci/network for
 configuration details.
 endef
diff --git a/package/network/ipv6/ds-lite/files/dslite.sh b/package/network/ipv6/ds-lite/files/dslite.sh
index 017963926d..325401b98b 100644
--- a/package/network/ipv6/ds-lite/files/dslite.sh
+++ b/package/network/ipv6/ds-lite/files/dslite.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
-# dslite.sh - IPv4-in-IPv6 tunnel backend
+# dslite.sh - IPv4-in-IPv6 tunnel backend for ipip6 and ds-lite
 # Copyright (c) 2013 OpenWrt.org
+# Copyright (c) 2013 Steven Barth <steven at midlink.org>
+# Copyright (c) 2021 Kenji Uno <ku at digitaldolphins.jp>
+# Copyright (c) 2024 Arayuki Mago <ms at missing233.com>
 
 [ -n "$INCLUDE_ONLY" ] || {
 	. /lib/functions.sh
@@ -9,10 +12,13 @@
 	init_proto "$@"
 }
 
-proto_dslite_setup() {
+tnl_setup() {
 	local cfg="$1"
 	local iface="$2"
-	local link="ds-$cfg"
+	local tnl_type="$3"
+	local ip4addr="$4"
+	local ip4gateway="$5"
+	local link="$tnl_type-$cfg"
 	local remoteip6
 
 	local mtu ttl peeraddr ip6addr tunlink zone weakif encaplimit
@@ -59,7 +65,7 @@ proto_dslite_setup() {
 
 	proto_init_update "$link" 1
 	proto_add_ipv4_route "0.0.0.0" 0
-	proto_add_ipv4_address "192.0.0.2" "" "" "192.0.0.1"
+	proto_add_ipv4_address "$ip4addr" "" "" "$ip4gateway"
 
 	proto_add_tunnel
 	json_add_string mode ipip6
@@ -76,23 +82,22 @@ proto_dslite_setup() {
 	proto_add_data
 	[ -n "$zone" ] && json_add_string zone "$zone"
 
-	json_add_array firewall
-	  json_add_object ""
-	    json_add_string type nat
-	    json_add_string target ACCEPT
-	  json_close_object
-	json_close_array
+	if [ "$tnl_type" = "ds" ]; then
+		json_add_array firewall
+			json_add_object ""
+				json_add_string type nat
+				json_add_string target ACCEPT
+			json_close_object
+		json_close_array
+	fi
+
 	proto_close_data
 
 	proto_send_update "$cfg"
 }
 
-proto_dslite_teardown() {
-	local cfg="$1"
-}
-
-proto_dslite_init_config() {
-	no_device=1             
+init_config() {
+	no_device=1
 	available=1
 
 	proto_config_add_string "ip6addr"
@@ -105,6 +110,34 @@ proto_dslite_init_config() {
 	proto_config_add_string "weakif"
 }
 
+proto_ipip6_init_config() {
+	init_config
+	proto_config_add_string "ip4ifaddr"
+}
+
+proto_ipip6_setup() {
+	local ip4ifaddr
+	json_get_vars ip4ifaddr
+	tnl_setup "$1" "$2" "ipip6" "$ip4ifaddr" "0.0.0.0"
+}
+
+proto_ipip6_teardown() {
+	local cfg="$1"
+}
+
+proto_dslite_init_config() {
+	init_config
+}
+
+proto_dslite_setup() {
+	tnl_setup "$1" "$2" "ds" "192.0.0.2" "192.0.0.1"
+}
+
+proto_dslite_teardown() {
+	local cfg="$1"
+}
+
 [ -n "$INCLUDE_ONLY" ] || {
-        add_protocol dslite
+	add_protocol ipip6
+	add_protocol dslite
 }