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Subject[PATCH v2] fix compile errors due to unsync linux/in6.h and netinet/in.h
I meet below compile errors:
"
In file included from test_tcpnotify_kern.c:12:
/usr/include/netinet/in.h:101:5: error: expected identifier
IPPROTO_HOPOPTS = 0, /* IPv6 Hop-by-Hop options. */
^
/usr/include/linux/in6.h:131:26: note: expanded from macro 'IPPROTO_HOPOPTS'
^
In file included from test_tcpnotify_kern.c:12:
/usr/include/netinet/in.h:103:5: error: expected identifier
IPPROTO_ROUTING = 43, /* IPv6 routing header. */
^
/usr/include/linux/in6.h:132:26: note: expanded from macro 'IPPROTO_ROUTING'
^
In file included from test_tcpnotify_kern.c:12:
/usr/include/netinet/in.h:105:5: error: expected identifier
IPPROTO_FRAGMENT = 44, /* IPv6 fragmentation header. */
^
/usr/include/linux/in6.h:133:26: note: expanded from macro 'IPPROTO_FRAGMENT'
"
The same compile errors are reported for test_tcpbpf_kern.c too.

My environment:
lsb_release -a:
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.6 LTS
Release: 16.04
Codename: xenial

dpkg -l | grep libc-dev:
ii libc-dev-bin 2.23-0ubuntu11 amd64 GNU C Library: Development binaries
ii linux-libc-dev:amd64 4.4.0-145.171 amd64 Linux Kernel Headers for development.

The reason is linux/in6.h and netinet/in.h aren't synchronous about how to
handle the same definitions, IPPROTO_HOPOPTS, etc.

This patch fixes the compile errors by moving <netinet/in.h> to before the
<linux/*.h>.

Signed-off-by: Wang YanQing <udknight@gmail.com>
---
Changes
v1-v2:
1:Rewrite the changelog.

tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c | 2 +-
tools/testing/selftests/bpf/progs/test_tcpnotify_kern.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c b/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c
index 74f73b3..c7c3240 100644
--- a/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c
+++ b/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#include <stddef.h>
#include <string.h>
+#include <netinet/in.h>
#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
@@ -9,7 +10,6 @@
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/tcp.h>
-#include <netinet/in.h>
#include "bpf_helpers.h"
#include "bpf_endian.h"
#include "test_tcpbpf.h"
diff --git a/tools/testing/selftests/bpf/progs/test_tcpnotify_kern.c b/tools/testing/selftests/bpf/progs/test_tcpnotify_kern.c
index edbca20..ec6db6e 100644
--- a/tools/testing/selftests/bpf/progs/test_tcpnotify_kern.c
+++ b/tools/testing/selftests/bpf/progs/test_tcpnotify_kern.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#include <stddef.h>
#include <string.h>
+#include <netinet/in.h>
#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
@@ -9,7 +10,6 @@
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/tcp.h>
-#include <netinet/in.h>
#include "bpf_helpers.h"
#include "bpf_endian.h"
#include "test_tcpnotify.h"
--
1.8.5.6.2.g3d8a54e.dirty
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