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Message-ID: <20250702223606.1054680-8-kuniyu@google.com>
Date: Wed, 2 Jul 2025 22:35:19 +0000
From: Kuniyuki Iwashima <kuniyu@...gle.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>,
Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: [PATCH v1 net-next 7/7] selftest: af_unix: Add test for SO_INQ.
Let's add a simple test to check the basic functionality of SO_INQ.
The test does the following:
1. Create socketpair in self->fd[]
2. Enable SO_INQ
3. Send data via self->fd[0]
4. Receive data from self->fd[1]
5. Compare the SCM_INQ cmsg with ioctl(SIOCINQ)
Signed-off-by: Kuniyuki Iwashima <kuniyu@...gle.com>
---
tools/testing/selftests/net/.gitignore | 1 +
tools/testing/selftests/net/af_unix/Makefile | 2 +-
tools/testing/selftests/net/af_unix/scm_inq.c | 125 ++++++++++++++++++
3 files changed, 127 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/net/af_unix/scm_inq.c
diff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftests/net/.gitignore
index c6dd2a335cf4..47c293c2962f 100644
--- a/tools/testing/selftests/net/.gitignore
+++ b/tools/testing/selftests/net/.gitignore
@@ -34,6 +34,7 @@ reuseport_bpf_numa
reuseport_dualstack
rxtimestamp
sctp_hello
+scm_inq
scm_pidfd
scm_rights
sk_bind_sendto_listen
diff --git a/tools/testing/selftests/net/af_unix/Makefile b/tools/testing/selftests/net/af_unix/Makefile
index 50584479540b..a4b61c6d0290 100644
--- a/tools/testing/selftests/net/af_unix/Makefile
+++ b/tools/testing/selftests/net/af_unix/Makefile
@@ -1,4 +1,4 @@
CFLAGS += $(KHDR_INCLUDES)
-TEST_GEN_PROGS := diag_uid msg_oob scm_pidfd scm_rights unix_connect
+TEST_GEN_PROGS := diag_uid msg_oob scm_inq scm_pidfd scm_rights unix_connect
include ../../lib.mk
diff --git a/tools/testing/selftests/net/af_unix/scm_inq.c b/tools/testing/selftests/net/af_unix/scm_inq.c
new file mode 100644
index 000000000000..9d22561e7b8f
--- /dev/null
+++ b/tools/testing/selftests/net/af_unix/scm_inq.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright 2025 Google LLC */
+
+#include <linux/sockios.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include "../../kselftest_harness.h"
+
+#define NR_CHUNKS 100
+#define MSG_LEN 256
+
+struct scm_inq {
+ struct cmsghdr cmsghdr;
+ int inq;
+};
+
+FIXTURE(scm_inq)
+{
+ int fd[2];
+};
+
+FIXTURE_VARIANT(scm_inq)
+{
+ int type;
+};
+
+FIXTURE_VARIANT_ADD(scm_inq, stream)
+{
+ .type = SOCK_STREAM,
+};
+
+FIXTURE_VARIANT_ADD(scm_inq, dgram)
+{
+ .type = SOCK_DGRAM,
+};
+
+FIXTURE_VARIANT_ADD(scm_inq, seqpacket)
+{
+ .type = SOCK_SEQPACKET,
+};
+
+FIXTURE_SETUP(scm_inq)
+{
+ int err;
+
+ err = socketpair(AF_UNIX, variant->type | SOCK_NONBLOCK, 0, self->fd);
+ ASSERT_EQ(0, err);
+}
+
+FIXTURE_TEARDOWN(scm_inq)
+{
+ close(self->fd[0]);
+ close(self->fd[1]);
+}
+
+static void send_chunks(struct __test_metadata *_metadata,
+ FIXTURE_DATA(scm_inq) *self)
+{
+ char buf[MSG_LEN] = {};
+ int i, ret;
+
+ for (i = 0; i < NR_CHUNKS; i++) {
+ ret = send(self->fd[0], buf, sizeof(buf), 0);
+ ASSERT_EQ(sizeof(buf), ret);
+ }
+}
+
+static void recv_chunks(struct __test_metadata *_metadata,
+ FIXTURE_DATA(scm_inq) *self)
+{
+ struct msghdr msg = {};
+ struct iovec iov = {};
+ struct scm_inq cmsg;
+ char buf[MSG_LEN];
+ int i, ret;
+ int inq;
+
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = &cmsg;
+ msg.msg_controllen = CMSG_SPACE(sizeof(cmsg.inq));
+
+ iov.iov_base = buf;
+ iov.iov_len = sizeof(buf);
+
+ for (i = 0; i < NR_CHUNKS; i++) {
+ memset(buf, 0, sizeof(buf));
+ memset(&cmsg, 0, sizeof(cmsg));
+
+ ret = recvmsg(self->fd[1], &msg, 0);
+ ASSERT_EQ(MSG_LEN, ret);
+ ASSERT_NE(NULL, CMSG_FIRSTHDR(&msg));
+ ASSERT_EQ(CMSG_LEN(sizeof(cmsg.inq)), cmsg.cmsghdr.cmsg_len);
+ ASSERT_EQ(SOL_SOCKET, cmsg.cmsghdr.cmsg_level);
+ ASSERT_EQ(SCM_INQ, cmsg.cmsghdr.cmsg_type);
+
+ ret = ioctl(self->fd[1], SIOCINQ, &inq);
+ ASSERT_EQ(0, ret);
+ ASSERT_EQ(cmsg.inq, inq);
+ }
+}
+
+TEST_F(scm_inq, basic)
+{
+ int err, inq;
+
+ err = setsockopt(self->fd[1], SOL_SOCKET, SO_INQ, &(int){1}, sizeof(int));
+ if (variant->type != SOCK_STREAM) {
+ ASSERT_EQ(-ENOPROTOOPT, -errno);
+ return;
+ }
+
+ ASSERT_EQ(0, err);
+
+ err = ioctl(self->fd[1], SIOCINQ, &inq);
+ ASSERT_EQ(0, err);
+ ASSERT_EQ(0, inq);
+
+ send_chunks(_metadata, self);
+ recv_chunks(_metadata, self);
+}
+
+TEST_HARNESS_MAIN
--
2.50.0.727.gbf7dc18ff4-goog
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