[PATCH bpf-next v2 1/5] samples: bpf: force IPv4 in ping

[Jakub Kicinski <jakub.kicinski@xxxxxxxxxxxxx>]

ping localhost may default of IPv6 on modern systems, but
samples are trying to only parse IPv4.  Force IPv4.

samples/bpf/tracex1_user.c doesn't interpret the packet so
we don't care which IP version will be used there.

Signed-off-by: Jakub Kicinski <jakub.kicinski@xxxxxxxxxxxxx>
Reviewed-by: Quentin Monnet <quentin.monnet@xxxxxxxxxxxxx>
Acked-by: Andrii Nakryiko <andriin@xxxxxx>
---
 samples/bpf/sock_example.c | 2 +-
 samples/bpf/sockex1_user.c | 2 +-
 samples/bpf/sockex2_user.c | 2 +-
 samples/bpf/sockex3_user.c | 2 +-
 samples/bpf/tracex2_user.c | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/samples/bpf/sock_example.c b/samples/bpf/sock_example.c
index 60ec467c78ab..00aae1d33fca 100644
--- a/samples/bpf/sock_example.c
+++ b/samples/bpf/sock_example.c
@@ -99,7 +99,7 @@ int main(void)
 {
 	FILE *f;
 
-	f = popen("ping -c5 localhost", "r");
+	f = popen("ping -4 -c5 localhost", "r");
 	(void)f;
 
 	return test_sock();
diff --git a/samples/bpf/sockex1_user.c b/samples/bpf/sockex1_user.c
index 93ec01c56104..be8ba5686924 100644
--- a/samples/bpf/sockex1_user.c
+++ b/samples/bpf/sockex1_user.c
@@ -26,7 +26,7 @@ int main(int ac, char **argv)
 	assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
 			  sizeof(prog_fd[0])) == 0);
 
-	f = popen("ping -c5 localhost", "r");
+	f = popen("ping -4 -c5 localhost", "r");
 	(void) f;
 
 	for (i = 0; i < 5; i++) {
diff --git a/samples/bpf/sockex2_user.c b/samples/bpf/sockex2_user.c
index 1d5c6e9a6d27..125ee6efc913 100644
--- a/samples/bpf/sockex2_user.c
+++ b/samples/bpf/sockex2_user.c
@@ -34,7 +34,7 @@ int main(int ac, char **argv)
 	assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
 			  sizeof(prog_fd[0])) == 0);
 
-	f = popen("ping -c5 localhost", "r");
+	f = popen("ping -4 -c5 localhost", "r");
 	(void) f;
 
 	for (i = 0; i < 5; i++) {
diff --git a/samples/bpf/sockex3_user.c b/samples/bpf/sockex3_user.c
index 9d02e0404719..bbb1cd0666a9 100644
--- a/samples/bpf/sockex3_user.c
+++ b/samples/bpf/sockex3_user.c
@@ -58,7 +58,7 @@ int main(int argc, char **argv)
 			  sizeof(__u32)) == 0);
 
 	if (argc > 1)
-		f = popen("ping -c5 localhost", "r");
+		f = popen("ping -4 -c5 localhost", "r");
 	else
 		f = popen("netperf -l 4 localhost", "r");
 	(void) f;
diff --git a/samples/bpf/tracex2_user.c b/samples/bpf/tracex2_user.c
index 1a81e6a5c2ea..c9544a4ce61a 100644
--- a/samples/bpf/tracex2_user.c
+++ b/samples/bpf/tracex2_user.c
@@ -131,7 +131,7 @@ int main(int ac, char **argv)
 	signal(SIGTERM, int_exit);
 
 	/* start 'ping' in the background to have some kfree_skb events */
-	f = popen("ping -c5 localhost", "r");
+	f = popen("ping -4 -c5 localhost", "r");
 	(void) f;
 
 	/* start 'dd' in the background to have plenty of 'write' syscalls */
-- 
2.19.2