selftest: Add test for bind() conflicts.

The test checks if (IPv4, IPv6) address pair properly conflict or not.

  * IPv4
    * 0.0.0.0
    * 127.0.0.1

  * IPv6
    * ::
    * ::1

If the IPv6 address is [::], the second bind() always fails.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftests/net/.gitignore
index a6911ca..80f06aa 100644 (file)
--- a/tools/testing/selftests/net/.gitignore
+++ b/tools/testing/selftests/net/.gitignore
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 bind_bhash
 bind_timewait
+bind_wildcard
 csum
 cmsg_sender
 diag_uid

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index 6cd8993..80fbfe0 100644 (file)
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -80,6 +80,7 @@ TEST_GEN_FILES += sctp_hello
 TEST_GEN_FILES += csum
 TEST_GEN_FILES += nat6to4.o
 TEST_GEN_FILES += ip_local_port_range
+TEST_GEN_FILES += bind_wildcard
 
 TEST_FILES := settings
 

diff --git a/tools/testing/selftests/net/bind_wildcard.c b/tools/testing/selftests/net/bind_wildcard.c
new file mode 100644 (file)
index 0000000..58edfc1
--- /dev/null
+++ b/tools/testing/selftests/net/bind_wildcard.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright Amazon.com Inc. or its affiliates. */
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include "../kselftest_harness.h"
+
+FIXTURE(bind_wildcard)
+{
+       struct sockaddr_in addr4;
+       struct sockaddr_in6 addr6;
+       int expected_errno;
+};
+
+FIXTURE_VARIANT(bind_wildcard)
+{
+       const __u32 addr4_const;
+       const struct in6_addr *addr6_const;
+};
+
+FIXTURE_VARIANT_ADD(bind_wildcard, v4_any_v6_any)
+{
+       .addr4_const = INADDR_ANY,
+       .addr6_const = &in6addr_any,
+};
+
+FIXTURE_VARIANT_ADD(bind_wildcard, v4_any_v6_local)
+{
+       .addr4_const = INADDR_ANY,
+       .addr6_const = &in6addr_loopback,
+};
+
+FIXTURE_VARIANT_ADD(bind_wildcard, v4_local_v6_any)
+{
+       .addr4_const = INADDR_LOOPBACK,
+       .addr6_const = &in6addr_any,
+};
+
+FIXTURE_VARIANT_ADD(bind_wildcard, v4_local_v6_local)
+{
+       .addr4_const = INADDR_LOOPBACK,
+       .addr6_const = &in6addr_loopback,
+};
+
+FIXTURE_SETUP(bind_wildcard)
+{
+       self->addr4.sin_family = AF_INET;
+       self->addr4.sin_port = htons(0);
+       self->addr4.sin_addr.s_addr = htonl(variant->addr4_const);
+
+       self->addr6.sin6_family = AF_INET6;
+       self->addr6.sin6_port = htons(0);
+       self->addr6.sin6_addr = *variant->addr6_const;
+
+       if (variant->addr6_const == &in6addr_any)
+               self->expected_errno = EADDRINUSE;
+       else
+               self->expected_errno = 0;
+}
+
+FIXTURE_TEARDOWN(bind_wildcard)
+{
+}
+
+void bind_sockets(struct __test_metadata *_metadata,
+                 FIXTURE_DATA(bind_wildcard) *self,
+                 struct sockaddr *addr1, socklen_t addrlen1,
+                 struct sockaddr *addr2, socklen_t addrlen2)
+{
+       int fd[2];
+       int ret;
+
+       fd[0] = socket(addr1->sa_family, SOCK_STREAM, 0);
+       ASSERT_GT(fd[0], 0);
+
+       ret = bind(fd[0], addr1, addrlen1);
+       ASSERT_EQ(ret, 0);
+
+       ret = getsockname(fd[0], addr1, &addrlen1);
+       ASSERT_EQ(ret, 0);
+
+       ((struct sockaddr_in *)addr2)->sin_port = ((struct sockaddr_in *)addr1)->sin_port;
+
+       fd[1] = socket(addr2->sa_family, SOCK_STREAM, 0);
+       ASSERT_GT(fd[1], 0);
+
+       ret = bind(fd[1], addr2, addrlen2);
+       if (self->expected_errno) {
+               ASSERT_EQ(ret, -1);
+               ASSERT_EQ(errno, self->expected_errno);
+       } else {
+               ASSERT_EQ(ret, 0);
+       }
+
+       close(fd[1]);
+       close(fd[0]);
+}
+
+TEST_F(bind_wildcard, v4_v6)
+{
+       bind_sockets(_metadata, self,
+                    (struct sockaddr *)&self->addr4, sizeof(self->addr6),
+                    (struct sockaddr *)&self->addr6, sizeof(self->addr6));
+}
+
+TEST_F(bind_wildcard, v6_v4)
+{
+       bind_sockets(_metadata, self,
+                    (struct sockaddr *)&self->addr6, sizeof(self->addr6),
+                    (struct sockaddr *)&self->addr4, sizeof(self->addr4));
+}
+
+TEST_HARNESS_MAIN