linux-kernel - [PATCH v2] selftests/bpf: Fix connect4_prog tcp/socket header type conflict

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Date:   Mon, 29 Aug 2022 09:47:09 -0600
From:   James Hilliard <james.hilliard1@...il.com>
To:     bpf@...r.kernel.org
Cc:     James Hilliard <james.hilliard1@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Mykola Lysenko <mykolal@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] selftests/bpf: Fix connect4_prog tcp/socket header type conflict

There is a potential for us to hit a type conflict when including
netinet/tcp.h and sys/socket.h, we can replace both of these includes
with linux/tcp.h and bpf_tcp_helpers.h to avoid this conflict.

Fixes the following error:
In file included from /usr/include/netinet/tcp.h:91,
                 from progs/connect4_prog.c:11:
/home/buildroot/opt/cross/lib/gcc/bpf/13.0.0/include/stdint.h:34:23: error: conflicting types for 'int8_t'; have 'char'
   34 | typedef __INT8_TYPE__ int8_t;
      |                       ^~~~~~
In file included from /usr/include/x86_64-linux-gnu/sys/types.h:155,
                 from /usr/include/x86_64-linux-gnu/bits/socket.h:29,
                 from /usr/include/x86_64-linux-gnu/sys/socket.h:33,
                 from progs/connect4_prog.c:10:
/usr/include/x86_64-linux-gnu/bits/stdint-intn.h:24:18: note: previous declaration of 'int8_t' with type 'int8_t' {aka 'signed char'}
   24 | typedef __int8_t int8_t;
      |                  ^~~~~~
/home/buildroot/opt/cross/lib/gcc/bpf/13.0.0/include/stdint.h:43:24: error: conflicting types for 'int64_t'; have 'long int'
   43 | typedef __INT64_TYPE__ int64_t;
      |                        ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/stdint-intn.h:27:19: note: previous declaration of 'int64_t' with type 'int64_t' {aka 'long long int'}
   27 | typedef __int64_t int64_t;
      |                   ^~~~~~~

Signed-off-by: James Hilliard <james.hilliard1@...il.com>
---
Changes v1 -> v2:
  - use bpf_tcp_helpers.h so we can use SOL_TCP
---
 tools/testing/selftests/bpf/progs/connect4_prog.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/connect4_prog.c b/tools/testing/selftests/bpf/progs/connect4_prog.c
index b241932911db..23d85f5027d3 100644
--- a/tools/testing/selftests/bpf/progs/connect4_prog.c
+++ b/tools/testing/selftests/bpf/progs/connect4_prog.c
@@ -7,13 +7,13 @@
 #include <linux/bpf.h>
 #include <linux/in.h>
 #include <linux/in6.h>
-#include <sys/socket.h>
-#include <netinet/tcp.h>
+#include <linux/tcp.h>
 #include <linux/if.h>
 #include <errno.h>
 
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_endian.h>
+#include "bpf_tcp_helpers.h"
 
 #define SRC_REWRITE_IP4		0x7f000004U
 #define DST_REWRITE_IP4		0x7f000001U
-- 
2.34.1