[PATCH] selftests/bpf: Fix connect4_prog tcp/socket header type conflict

[James Hilliard]

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 to avoid this conflict.

We also need to replace SOL_TCP with equivalent IPPROTO_TCP.

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@xxxxxxxxx>
---
 .../selftests/bpf/progs/connect4_prog.c       | 21 +++++++++----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/connect4_prog.c b/tools/testing/selftests/bpf/progs/connect4_prog.c
index b241932911db..0f68b8d756b3 100644
--- a/tools/testing/selftests/bpf/progs/connect4_prog.c
+++ b/tools/testing/selftests/bpf/progs/connect4_prog.c
@@ -7,8 +7,7 @@
 #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>
 
@@ -52,7 +51,7 @@ static __inline int verify_cc(struct bpf_sock_addr *ctx,
 	char buf[TCP_CA_NAME_MAX];
 	int i;
 
-	if (bpf_getsockopt(ctx, SOL_TCP, TCP_CONGESTION, &buf, sizeof(buf)))
+	if (bpf_getsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION, &buf, sizeof(buf)))
 		return 1;
 
 	for (i = 0; i < TCP_CA_NAME_MAX; i++) {
@@ -70,12 +69,12 @@ static __inline int set_cc(struct bpf_sock_addr *ctx)
 	char reno[TCP_CA_NAME_MAX] = "reno";
 	char cubic[TCP_CA_NAME_MAX] = "cubic";
 
-	if (bpf_setsockopt(ctx, SOL_TCP, TCP_CONGESTION, &reno, sizeof(reno)))
+	if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION, &reno, sizeof(reno)))
 		return 1;
 	if (verify_cc(ctx, reno))
 		return 1;
 
-	if (bpf_setsockopt(ctx, SOL_TCP, TCP_CONGESTION, &cubic, sizeof(cubic)))
+	if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION, &cubic, sizeof(cubic)))
 		return 1;
 	if (verify_cc(ctx, cubic))
 		return 1;
@@ -113,15 +112,15 @@ static __inline int set_keepalive(struct bpf_sock_addr *ctx)
 	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one)))
 		return 1;
 	if (ctx->type == SOCK_STREAM) {
-		if (bpf_setsockopt(ctx, SOL_TCP, TCP_KEEPIDLE, &one, sizeof(one)))
+		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_KEEPIDLE, &one, sizeof(one)))
 			return 1;
-		if (bpf_setsockopt(ctx, SOL_TCP, TCP_KEEPINTVL, &one, sizeof(one)))
+		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_KEEPINTVL, &one, sizeof(one)))
 			return 1;
-		if (bpf_setsockopt(ctx, SOL_TCP, TCP_KEEPCNT, &one, sizeof(one)))
+		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_KEEPCNT, &one, sizeof(one)))
 			return 1;
-		if (bpf_setsockopt(ctx, SOL_TCP, TCP_SYNCNT, &one, sizeof(one)))
+		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_SYNCNT, &one, sizeof(one)))
 			return 1;
-		if (bpf_setsockopt(ctx, SOL_TCP, TCP_USER_TIMEOUT, &one, sizeof(one)))
+		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_USER_TIMEOUT, &one, sizeof(one)))
 			return 1;
 	}
 	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_KEEPALIVE, &zero, sizeof(zero)))
@@ -135,7 +134,7 @@ static __inline int set_notsent_lowat(struct bpf_sock_addr *ctx)
 	int lowat = 65535;
 
 	if (ctx->type == SOCK_STREAM) {
-		if (bpf_setsockopt(ctx, SOL_TCP, TCP_NOTSENT_LOWAT, &lowat, sizeof(lowat)))
+		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_NOTSENT_LOWAT, &lowat, sizeof(lowat)))
 			return 1;
 	}
 
-- 
2.34.1