[openwrt/openwrt] kernel: enable SRv6 support by enabling lwtunnel

[LEDE Commits]

aparcar pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/a1a7f3274e0ed27511d45f62ee20281d8d57c7af

commit a1a7f3274e0ed27511d45f62ee20281d8d57c7af
Author: Nick Hainke <vincent at systemli.org>
AuthorDate: Sat Dec 12 11:23:54 2020 +0100

    kernel: enable SRv6 support by enabling lwtunnel
    
    Enable the ability to use segment routing based on IPv6. It allows the
    packet to specify a path that the packet should take through the
    network.
    
    Lwtunnel allow an easy encapsulation of a package. You can just install
    ip-full package and use it:
    
      ip -6 route add  2003::/64 dev eth0 encap seg6 mode encap \
        segs 2001::1,2002::2
    
    An IPv6 package looks like this:
      [IPv6 HDR][IPv6 RH][IPv6 HDR][Data...]
    
    Netifd support:
      https://git.openwrt.org/?p=project/netifd.git;
         a=commit;h=458b1a7e9473c150a40cae5d8be174f4bb03bd39
    
    Increases imagesize by 24.125 KiB. Therefore, only enable for devices
    with enough flash.
    
    Signed-off-by: Nick Hainke <vincent at systemli.org>
---
 config/Config-kernel.in         | 8 ++++++++
 target/linux/generic/config-5.4 | 1 -
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/config/Config-kernel.in b/config/Config-kernel.in
index e22fcf6382..858ee0cf60 100644
--- a/config/Config-kernel.in
+++ b/config/Config-kernel.in
@@ -975,6 +975,14 @@ if KERNEL_IPV6
 	config KERNEL_IPV6_PIMSM_V2
 		def_bool n
 
+	config KERNEL_IPV6_SEG6_LWTUNNEL
+		def_bool y if !SMALL_FLASH
+		help
+		  Using lwtunnel requires full-ip package.
+
+	config KERNEL_LWTUNNEL_BPF
+		def_bool n
+
 endif
 
 #
diff --git a/target/linux/generic/config-5.4 b/target/linux/generic/config-5.4
index 46bc731f04..9006c63ecf 100644
--- a/target/linux/generic/config-5.4
+++ b/target/linux/generic/config-5.4
@@ -2400,7 +2400,6 @@ CONFIG_IPV6_NDISC_NODETYPE=y
 # CONFIG_IPV6_ROUTER_PREF is not set
 # CONFIG_IPV6_ROUTE_INFO is not set
 # CONFIG_IPV6_SEG6_HMAC is not set
-# CONFIG_IPV6_SEG6_LWTUNNEL is not set
 # CONFIG_IPV6_SIT is not set
 # CONFIG_IPV6_SIT_6RD is not set
 # CONFIG_IPV6_TUNNEL is not set