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From: Baruch Siach <baruch@tkos.co.il>
Date: Fri, 16 Nov 2018 09:30:33 +0200
Subject: [PATCH] include: fix build with kernel headers before 4.2
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Commit 672accf1530 (include: update kernel netfilter header files)
updated linux/netfilter.h and brought with it the update from kernel
commit a263653ed798 (netfilter: don't pull include/linux/netfilter.h
from netns headers). This triggers conflict of headers that is fixed in
kernel commit 279c6c7fa64f (api: fix compatibility of linux/in.h with
netinet/in.h) included in kernel version 4.2. For earlier kernel headers
we need a workaround that prevents the headers conflict.
Fixes the following build failure:
In file included from .../sysroot/usr/include/netinet/ip.h:25:0,
from ../include/libiptc/ipt_kernel_headers.h:8,
from ../include/libiptc/libiptc.h:6,
from libip4tc.c:29:
.../sysroot/usr/include/linux/in.h:26:3: error: redeclaration of enumerator ‘IPPROTO_IP’
IPPROTO_IP = 0, /* Dummy protocol for TCP */
^
.../sysroot/usr/include/netinet/in.h:33:5: note: previous definition of ‘IPPROTO_IP’ was here
IPPROTO_IP = 0, /* Dummy protocol for TCP. */
^~~~~~~~~~
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Florian Westphal <fw@strlen.de>
---
include/linux/netfilter.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index c3f087ac680c..bacf8cd92116 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -3,7 +3,9 @@
#include <linux/types.h>
+#ifndef _NETINET_IN_H
#include <linux/in.h>
+#endif
#include <linux/in6.h>
#include <limits.h>
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