tailscale: update to 1.36.0

- Update tailscale to version 1.36.0
 - Patch iptables support

Tailscale does not (yet) support nftables.
Tailscale allows running with --netfilter=off allowing
end-user to create his own firewall rules, but this
affects only tailscale cli, not tailscaled daemon, so
connection cannot be made without error telling that
tailscaled was unable to determine execute iptables
for determining it's version.

There is a work-around for those who do not want
nft-iptables compatibility package; they can create
a script to /usr/bin/iptables which responds to
--version argument and echos fake version string
and on any other arguments or no arguments, just exits.

After this procedure and starting tailscale cli with
netfilter off- it works. Openwrt has moved on to
nftables, so iptables manipulation seems unnecessary.
Especially for other reasons, on Openwrt, firewall
should be configured on it's own, because firewall
rules made by other software, such as tailscale,
loose their firewalling rules when firewall restarts.

So I patched it to allow "fake" iptables pointing
to executable /bin/false and ignoring version
request. And I also set cli to default to
netfilter off setting.

If still end-user wants to use iptables, this
patch does not make it impossible; just install
iptables, or nft-iptables, and run tailscale
with argument --netfilter=on and it works out
as it did before, tailscaled daemon still
matches with iptables if it is found in $PATH.

Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>

net/tailscale/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=tailscale
-PKG_VERSION:=1.32.3
+PKG_VERSION:=1.36.0
 PKG_RELEASE:=1
 
 PKG_SOURCE:=tailscale-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://codeload.github.com/tailscale/tailscale/tar.gz/v$(PKG_VERSION)?
-PKG_HASH:=4cf88a1d754240ce71b29d3a65ca480091ad9c614ac99c541cef6fdaf0585dd4
+PKG_HASH:=25b293a7e65d7b962f0c56454d66fa56c89c3aa995467218f24efa335b924c76
 
 PKG_MAINTAINER:=Jan Pavlinec <jan.pavlinec1@gmail.com>
 PKG_LICENSE:=BSD-3-Clause
@@ -61,24 +61,44 @@ endef
 
 Package/tailscaled/description:=$(Package/tailscale/description)
 
+define Package/tailscaled/conffiles
+/etc/config/tailscale
+/etc/tailscale/tailscaled.state
+endef
+
+GO_IPTABLES_VERSION:=0.6.0
+GO_IPTABLES_FILE:=$(PKG_NAME)-go-iptables-$(GO_IPTABLES_VERSION).tar.gz
+
+define Download/go-iptables
+  URL:=https://codeload.github.com/coreos/go-iptables/tar.gz/v$(GO_IPTABLES_VERSION)?
+  URL_FILE:=$(GO_IPTABLES_FILE)
+  FILE:=$(GO_IPTABLES_FILE)
+  HASH:=a784cc17fcb17879f073eae47bc4c2e899f59f6906dac5a0aa7a9cc9f95ea66d
+endef
+
+define Build/Prepare
+	$(PKG_UNPACK)
+	[ ! -d ./src/ ] || $(CP) ./src/. $(PKG_BUILD_DIR)
+	$(eval $(call Download,go-iptables))
+	( \
+		mkdir -p $(PKG_BUILD_DIR)/patched/ ; \
+		gzip -dc $(DL_DIR)/$(GO_IPTABLES_FILE) | $(HOST_TAR) -C $(PKG_BUILD_DIR)/patched $(TAR_OPTIONS) ; \
+		mv $(PKG_BUILD_DIR)/patched/go-iptables-$(GO_IPTABLES_VERSION) $(PKG_BUILD_DIR)/patched/go-iptables ; \
+	)
+	$(Build/Patch)
+endef
+
 define Package/tailscale/install
 	$(INSTALL_DIR) $(1)/usr/sbin
 	$(INSTALL_BIN) $(GO_PKG_BUILD_BIN_DIR)/tailscale $(1)/usr/sbin
 endef
 
 define Package/tailscaled/install
-	$(INSTALL_DIR) $(1)/usr/sbin
+	$(INSTALL_DIR) $(1)/usr/sbin $(1)/etc/init.d $(1)/etc/config
 	$(INSTALL_BIN) $(GO_PKG_BUILD_BIN_DIR)/tailscaled $(1)/usr/sbin
-	$(INSTALL_DIR) $(1)/etc/init.d/
 	$(INSTALL_BIN) ./files//tailscale.init $(1)/etc/init.d/tailscale
-	$(INSTALL_DIR) $(1)/etc/config/
 	$(INSTALL_DATA) ./files//tailscale.conf $(1)/etc/config/tailscale
 endef
 
-define Package/tailscaled/conffiles
-/etc/config/tailscale
-/etc/tailscale/tailscaled.state
-endef
-
 $(eval $(call BuildPackage,tailscale))
 $(eval $(call BuildPackage,tailscaled))

net/tailscale/README.md

@@ -25,4 +25,9 @@ Run command and finish device registration with the given URL.
 tailscale up
 ```
 
+If you are running with nftables, it is not supported by tailscale,
+so disable it and configure firewall by yourself and add argument
+--netfilter-mode off
+to tailscale up command to disable iptables use.
+
 After that, you should see your router in tailscale admin page.

net/tailscale/patches/010-fake_iptables.patch

@@ -0,0 +1,53 @@
+--- a/go.mod
++++ b/go.mod
+@@ -2,6 +2,8 @@ module tailscale.com
+ 
+ go 1.19
+ 
++replace github.com/coreos/go-iptables => ./patched/go-iptables
++
+ require (
+ 	filippo.io/mkcert v1.4.3
+ 	github.com/Microsoft/go-winio v0.6.0
+--- a/patched/go-iptables/iptables/iptables.go
++++ b/patched/go-iptables/iptables/iptables.go
+@@ -149,12 +149,39 @@ func New(opts ...option) (*IPTables, err
+ 	return ipt, nil
+ }
+ 
++func NewFake(opts ...option) (*IPTables, error) {
++
++	ipt := &IPTables{
++		path:		   "/bin/false",
++		proto:		   ProtocolIPv4,
++		hasCheck:	   false,
++		hasWait:	   false,
++		waitSupportSecond: false,
++		hasRandomFully:	   false,
++		v1:		   0,
++		v2:		   0,
++		v3:		   0,
++		mode:		   "legacy",
++		timeout:	   0,
++	}
++
++	for _, opt := range opts {
++		opt(ipt)
++	}
++
++	return ipt, nil
++}
++
+ // New creates a new IPTables for the given proto.
+ // The proto will determine which command is used, either "iptables" or "ip6tables".
+ func NewWithProtocol(proto Protocol) (*IPTables, error) {
+ 	return New(IPFamily(proto), Timeout(0))
+ }
+ 
++func NewFakeWithProtocol(proto Protocol) (*IPTables, error) {
++	return NewFake(IPFamily(proto), Timeout(0))
++}
++
+ // Proto returns the protocol used by this IPTables.
+ func (ipt *IPTables) Proto() Protocol {
+ 	return ipt.proto

net/tailscale/patches/020-tailscaled_fake_iptables.patch

@@ -0,0 +1,32 @@
+--- a/wgengine/router/router_linux.go
++++ b/wgengine/router/router_linux.go
+@@ -129,7 +129,7 @@ func newUserspaceRouter(logf logger.Logf
+ 
+ 	ipt4, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
+ 	if err != nil {
+-		return nil, err
++		ipt4, err = iptables.NewFakeWithProtocol(iptables.ProtocolIPv4)
+ 	}
+ 
+ 	v6err := checkIPv6(logf)
+@@ -148,7 +148,7 @@ func newUserspaceRouter(logf logger.Logf
+ 		// if unavailable. We want that to be a non-fatal error.
+ 		ipt6, err = iptables.NewWithProtocol(iptables.ProtocolIPv6)
+ 		if err != nil {
+-			return nil, err
++			ipt6, err = iptables.NewFakeWithProtocol(iptables.ProtocolIPv6)
+ 		}
+ 	}
+ 
+@@ -1635,11 +1635,6 @@ func checkIPv6(logf logger.Logf) error {
+ 		return fmt.Errorf("kernel doesn't support IPv6 policy routing: %w", err)
+ 	}
+ 
+-	// Some distros ship ip6tables separately from iptables.
+-	if _, err := exec.LookPath("ip6tables"); err != nil {
+-		return err
+-	}
+-
+ 	return nil
+ }
+ 

net/tailscale/patches/030-default_to_netfilter_off.patch

@@ -0,0 +1,11 @@
+--- a/cmd/tailscale/cli/up.go
++++ b/cmd/tailscale/cli/up.go
+@@ -143,7 +143,7 @@ func defaultNetfilterMode() string {
+ 	if distro.Get() == distro.Synology {
+ 		return "off"
+ 	}
+-	return "on"
++	return "off"
+ }
+ 
+ type upArgsT struct {

net/tailscale/test.sh

@@ -1,8 +1,10 @@
 #!/bin/sh
-if command -v tailscale; then
-    tailscale version | grep "$2" || exit 1
-fi
 
-if command -v tailscaled; then
-    tailscaled -version | grep "$2"
-fi
+case "$1" in
+	tailscale)
+		tailscale version | grep "$2"
+		;;
+	tailscaled)
+		tailscaled -version | grep "$2"
+		;;
+esac