When seg6.h is included in a user space program that also includes
netinet/in.h, it results in multiple definitions of structures such as
struct in6_addr. Recent glibc versions have a workaround that consists in
defining __USE_KERNEL_IPV6_DEFS to prevent duplicates. However, such a
program will fail to compile with older glibc versions.
This patch ensures that including seg6.h will work in any case.
Fixes: ea3ebc73b46fbdb049dafd47543bb22efaa09c8e ("uapi: fix linux/seg6.h and
linux/seg6_iptunnel.h userspace compilation errors")
Reported-by: Daniel Borkmann <dan...@iogearbox.net>
Signed-off-by: David Lebrun <david.leb...@uclouvain.be>
---
include/uapi/linux/seg6.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/uapi/linux/seg6.h b/include/uapi/linux/seg6.h
index 7278511..52b8f46 100644
--- a/include/uapi/linux/seg6.h
+++ b/include/uapi/linux/seg6.h
@@ -15,7 +15,16 @@
#define _UAPI_LINUX_SEG6_H
#include <linux/types.h>
+
+#ifdef __KERNEL__
#include <linux/in6.h> /* For struct in6_addr. */
+#else
+#ifdef __USE_KERNEL_IPV6_DEFS
+#include <linux/in6.h>
+#else
+#include <netinet/in.h>
+#endif
+#endif
/*
* SRH
--
2.10.2
