[bpf-next PATCH] bpf, selftests: use ::1 for localhost in tcp_server.py

Using localhost requires the host to have a /etc/hosts file with that
specific line in it. By default my dev box did not, they used
ip6-localhost, so the test was failing. To fix remove the need for any
/etc/hosts and use ::1.

I could just add the line, but this seems easier.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
---
 tools/testing/selftests/bpf/tcp_client.py |    2 +-
 tools/testing/selftests/bpf/tcp_server.py |    2 +-
 tools/testing/selftests/bpf/test_netcnt.c |    4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/bpf/tcp_client.py b/tools/testing/selftests/bpf/tcp_client.py
index a53ed58..bfff82b 100755
--- a/tools/testing/selftests/bpf/tcp_client.py
+++ b/tools/testing/selftests/bpf/tcp_client.py

@@ -34,7 +34,7 @@ serverPort = int(sys.argv[1])
 # create active socket
 sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
 try:
-    sock.connect(('localhost', serverPort))
+    sock.connect(('::1', serverPort))
 except socket.error as e:
     sys.exit(1)
 

diff --git a/tools/testing/selftests/bpf/tcp_server.py b/tools/testing/selftests/bpf/tcp_server.py
index 0ca60d1..42ab888 100755
--- a/tools/testing/selftests/bpf/tcp_server.py
+++ b/tools/testing/selftests/bpf/tcp_server.py

@@ -38,7 +38,7 @@ serverSocket = None
 # create passive socket
 serverSocket = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
 
-try: serverSocket.bind(('localhost', 0))
+try: serverSocket.bind(('::1', 0))
 except socket.error as msg:
     print('bind fails: ' + str(msg))
 

diff --git a/tools/testing/selftests/bpf/test_netcnt.c b/tools/testing/selftests/bpf/test_netcnt.c
index c1da540..7a68c90 100644
--- a/tools/testing/selftests/bpf/test_netcnt.c
+++ b/tools/testing/selftests/bpf/test_netcnt.c

@@ -82,9 +82,9 @@ int main(int argc, char **argv)
 	}
 
 	if (system("which ping6 &>/dev/null") == 0)
-		assert(!system("ping6 localhost -c 10000 -f -q > /dev/null"));
+		assert(!system("ping6 ::1 -c 10000 -f -q > /dev/null"));
 	else
-		assert(!system("ping -6 localhost -c 10000 -f -q > /dev/null"));
+		assert(!system("ping -6 ::1 -c 10000 -f -q > /dev/null"));
 
 	if (bpf_prog_query(cgroup_fd, BPF_CGROUP_INET_EGRESS, 0, NULL, NULL,
 			   &prog_cnt)) {

On Tue, Jul 28, 2020 at 7:40 AM John Fastabend [off-list ref] wrote:

Using localhost requires the host to have a /etc/hosts file with that
specific line in it. By default my dev box did not, they used
ip6-localhost, so the test was failing. To fix remove the need for any
/etc/hosts and use ::1.

I could just add the line, but this seems easier.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>

Acked-by: Song Liu <redacted>

On Tue, Jul 28, 2020 at 7:40 AM John Fastabend [off-list ref] wrote:

Using localhost requires the host to have a /etc/hosts file with that
specific line in it. By default my dev box did not, they used
ip6-localhost, so the test was failing. To fix remove the need for any
/etc/hosts and use ::1.

I could just add the line, but this seems easier.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
---

Makes sense.

Acked-by: Andrii Nakryiko <redacted>

 tools/testing/selftests/bpf/tcp_client.py |    2 +-
 tools/testing/selftests/bpf/tcp_server.py |    2 +-
 tools/testing/selftests/bpf/test_netcnt.c |    4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

[...]

On 7/28/20 4:39 PM, John Fastabend wrote:

Using localhost requires the host to have a /etc/hosts file with that
specific line in it. By default my dev box did not, they used
ip6-localhost, so the test was failing. To fix remove the need for any
/etc/hosts and use ::1.

I could just add the line, but this seems easier.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>

Applied, thanks!