4 files changed, 42 insertions, 0 deletions

diff --git a/tools/testing/selftests/net/reuseport_bpf.c b/tools/testing/selftests/net/reuseport_bpf.c
index b6634d6da3d6..12e48b97b862 100644
--- a/tools/testing/selftests/net/reuseport_bpf.c
+++ b/tools/testing/selftests/net/reuseport_bpf.c
@@ -23,6 +23,7 @@
 #include <sys/socket.h>
 #include <sys/resource.h>
 #include <unistd.h>
+#include <sched.h>
 
 #include "kselftest.h"
 
@@ -455,8 +456,18 @@ static __attribute__((destructor)) void main_dtor(void)
 	setrlimit(RLIMIT_MEMLOCK, &rlim_old);
 }
 
+static void setup_netns(void)
+{
+	if (unshare(CLONE_NEWNET))
+		error(1, errno, "failed to unshare netns");
+	if (system("ip link set lo up"))
+		error(1, 0, "failed to bring up lo interface in netns");
+}
+
 int main(void)
 {
+	setup_netns();
+
 	fprintf(stderr, "---- IPv4 UDP ----\n");
 	/* NOTE: UDP socket lookups traverse a different code path when there
 	 * are > 10 sockets in a group.  Run the bpf test through both paths.
diff --git a/tools/testing/selftests/net/reuseport_bpf_cpu.c b/tools/testing/selftests/net/reuseport_bpf_cpu.c
index 2d646174729f..ddfe92f6597a 100644
--- a/tools/testing/selftests/net/reuseport_bpf_cpu.c
+++ b/tools/testing/selftests/net/reuseport_bpf_cpu.c
@@ -228,10 +228,20 @@ static void test(int *rcv_fd, int len, int family, int proto)
 		close(rcv_fd[cpu]);
 }
 
+static void setup_netns(void)
+{
+	if (unshare(CLONE_NEWNET))
+		error(1, errno, "failed to unshare netns");
+	if (system("ip link set lo up"))
+		error(1, 0, "failed to bring up lo interface in netns");
+}
+
 int main(void)
 {
 	int *rcv_fd, cpus;
 
+	setup_netns();
+
 	cpus = sysconf(_SC_NPROCESSORS_ONLN);
 	if (cpus <= 0)
 		error(1, errno, "failed counting cpus");
diff --git a/tools/testing/selftests/net/reuseport_bpf_numa.c b/tools/testing/selftests/net/reuseport_bpf_numa.c
index 2ffd957ffb15..8ec52fc5ef41 100644
--- a/tools/testing/selftests/net/reuseport_bpf_numa.c
+++ b/tools/testing/selftests/net/reuseport_bpf_numa.c
@@ -230,10 +230,20 @@ static void test(int *rcv_fd, int len, int family, int proto)
 		close(rcv_fd[node]);
 }
 
+static void setup_netns(void)
+{
+	if (unshare(CLONE_NEWNET))
+		error(1, errno, "failed to unshare netns");
+	if (system("ip link set lo up"))
+		error(1, 0, "failed to bring up lo interface in netns");
+}
+
 int main(void)
 {
 	int *rcv_fd, nodes;
 
+	setup_netns();
+
 	if (numa_available() < 0)
 		ksft_exit_skip("no numa api support\n");
 
diff --git a/tools/testing/selftests/net/reuseport_dualstack.c b/tools/testing/selftests/net/reuseport_dualstack.c
index fb7a59ed759e..0eaf739d0c85 100644
--- a/tools/testing/selftests/net/reuseport_dualstack.c
+++ b/tools/testing/selftests/net/reuseport_dualstack.c
@@ -25,6 +25,7 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <unistd.h>
+#include <sched.h>
 
 static const int PORT = 8888;
 
@@ -156,10 +157,20 @@ static void test(int *rcv_fds, int count, int proto)
 	close(epfd);
 }
 
+static void setup_netns(void)
+{
+	if (unshare(CLONE_NEWNET))
+		error(1, errno, "failed to unshare netns");
+	if (system("ip link set lo up"))
+		error(1, 0, "failed to bring up lo interface in netns");
+}
+
 int main(void)
 {
 	int rcv_fds[32], i;
 
+	setup_netns();
+
 	fprintf(stderr, "---- UDP IPv4 created before IPv6 ----\n");
 	build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 5);
 	build_rcv_fd(AF_INET6, SOCK_DGRAM, &(rcv_fds[5]), 5);