[Buildroot] [PATCH 1/2] package/libnl: fix build with kernel < 4.15

Buildroot commit 0f2e9cc8784715bdf18e72c433fe9bece4537f85 bumped the
package from 3.11.0 to 3.12.0. This bump includes upstream commit
https://github.com/thom311/libnl/commit/9f8945251da404fb59778edc74be5775091e1f44
which added the usage of enums not present in older kernel versions.

The Gitlab pipelines caught the build errors with the defconfig
bootlin-aarch64-glibc-old:

lib/route/nh_encap_ila.c:50:19: error: ‘ILA_ATTR_IDENT_TYPE’ undeclared
 (first use in this function)
lib/route/nh_encap_ila.c:53:19: error: ‘ILA_ATTR_HOOK_TYPE’ undeclared
 (first use in this function)

Both enums were added to the Linux kernel in version 4.15:
https://github.com/torvalds/linux/commit/fddb231ebe647749782a9ebf11106a81f7168ba7
https://github.com/torvalds/linux/commit/70d5aef48a421a68bd9d1bf8f8267af406681580

Add upstream commit to fix the problem.

Signed-off-by: Bernd Kuhls <[email protected]>
---
Gitlab pipelines passed:
https://gitlab.com/bkuhls/buildroot/-/commits/929b31b2321208683f5f3e7a601fe75188c2ca32

 ...ude-linux-include-linux-header-ila.h.patch | 107 ++++++++++++++++++
 package/libnl/libnl.mk                        |   4 +
 2 files changed, 111 insertions(+)
 create mode 100644 package/libnl/0002-include-linux-include-linux-header-ila.h.patch

diff --git a/package/libnl/0002-include-linux-include-linux-header-ila.h.patch b/package/libnl/0002-include-linux-include-linux-header-ila.h.patch
new file mode 100644
index 0000000000..3270366dac
--- /dev/null
+++ b/package/libnl/0002-include-linux-include-linux-header-ila.h.patch
@@ -0,0 +1,107 @@
+From 49f8b364c9a6f6db4ab535f999386fecfa38241b Mon Sep 17 00:00:00 2001
+From: Thomas Haller <[email protected]>
+Date: Thu, 11 Dec 2025 22:27:07 +0100
+Subject: [PATCH] include/linux: include linux header "ila.h"
+
+Taken from v6.18 (7d0a66e4bb9081d75c82ec4957c50034cb0ea449).
+
+https://github.com/thom311/libnl/issues/447
+
+Upstream: https://github.com/thom311/libnl/commit/49f8b364c9a6f6db4ab535f999386fecfa38241b
+
+Signed-off-by: Bernd Kuhls <[email protected]>
+---
+ Makefile.am                       |  1 +
+ include/linux-private/linux/ila.h | 68 +++++++++++++++++++++++++++++++
+ 2 files changed, 69 insertions(+)
+ create mode 100644 include/linux-private/linux/ila.h
+
+diff --git a/Makefile.am b/Makefile.am
+index 2bd0c06e..e63e3112 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -278,6 +278,7 @@ noinst_HEADERS = \
+ 	include/linux-private/linux/if_packet.h \
+ 	include/linux-private/linux/if_tunnel.h \
+ 	include/linux-private/linux/if_vlan.h \
++	include/linux-private/linux/ila.h \
+ 	include/linux-private/linux/in.h \
+ 	include/linux-private/linux/in6.h \
+ 	include/linux-private/linux/in_route.h \
+diff --git a/include/linux-private/linux/ila.h b/include/linux-private/linux/ila.h
+new file mode 100644
+index 00000000..6a6c97cf
+--- /dev/null
++++ b/include/linux-private/linux/ila.h
+@@ -0,0 +1,68 @@
++/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
++/* ila.h - ILA Interface */
++
++#ifndef _LINUX_ILA_H
++#define _LINUX_ILA_H
++
++/* NETLINK_GENERIC related info */
++#define ILA_GENL_NAME		"ila"
++#define ILA_GENL_VERSION	0x1
++
++enum {
++	ILA_ATTR_UNSPEC,
++	ILA_ATTR_LOCATOR,			/* u64 */
++	ILA_ATTR_IDENTIFIER,			/* u64 */
++	ILA_ATTR_LOCATOR_MATCH,			/* u64 */
++	ILA_ATTR_IFINDEX,			/* s32 */
++	ILA_ATTR_DIR,				/* u32 */
++	ILA_ATTR_PAD,
++	ILA_ATTR_CSUM_MODE,			/* u8 */
++	ILA_ATTR_IDENT_TYPE,			/* u8 */
++	ILA_ATTR_HOOK_TYPE,			/* u8 */
++
++	__ILA_ATTR_MAX,
++};
++
++#define ILA_ATTR_MAX		(__ILA_ATTR_MAX - 1)
++
++enum {
++	ILA_CMD_UNSPEC,
++	ILA_CMD_ADD,
++	ILA_CMD_DEL,
++	ILA_CMD_GET,
++	ILA_CMD_FLUSH,
++
++	__ILA_CMD_MAX,
++};
++
++#define ILA_CMD_MAX	(__ILA_CMD_MAX - 1)
++
++#define ILA_DIR_IN	(1 << 0)
++#define ILA_DIR_OUT	(1 << 1)
++
++enum {
++	ILA_CSUM_ADJUST_TRANSPORT,
++	ILA_CSUM_NEUTRAL_MAP,
++	ILA_CSUM_NO_ACTION,
++	ILA_CSUM_NEUTRAL_MAP_AUTO,
++};
++
++enum {
++	ILA_ATYPE_IID = 0,
++	ILA_ATYPE_LUID,
++	ILA_ATYPE_VIRT_V4,
++	ILA_ATYPE_VIRT_UNI_V6,
++	ILA_ATYPE_VIRT_MULTI_V6,
++	ILA_ATYPE_NONLOCAL_ADDR,
++	ILA_ATYPE_RSVD_1,
++	ILA_ATYPE_RSVD_2,
++
++	ILA_ATYPE_USE_FORMAT = 32, /* Get type from type field in identifier */
++};
++
++enum {
++	ILA_HOOK_ROUTE_OUTPUT,
++	ILA_HOOK_ROUTE_INPUT,
++};
++
++#endif /* _LINUX_ILA_H */
+-- 
+2.47.3
+
diff --git a/package/libnl/libnl.mk b/package/libnl/libnl.mk
index 2dcb594141..5b79ea24a1 100644
--- a/package/libnl/libnl.mk
+++ b/package/libnl/libnl.mk
@@ -13,6 +13,10 @@ LIBNL_CPE_ID_VALID = YES
 LIBNL_INSTALL_STAGING = YES
 LIBNL_DEPENDENCIES = host-bison host-flex host-pkgconf
 
+# 0002-include-linux-include-linux-header-ila.h.patch
+LIBNL_AUTORECONF = YES
+HOST_LIBNL_AUTORECONF = YES
+
 HOST_LIBNL_DEPENDENCIES = host-bison host-flex host-pkgconf
 
 ifeq ($(BR2_PACKAGE_LIBNL_TOOLS),y)
-- 
2.47.3

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