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selftest: af_unix: Add msg_oob.c.

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AF_UNIX's MSG_OOB functionality lacked thorough testing, and we found
some bizarre behaviour.

The new selftest validates every MSG_OOB operation against TCP as a
reference implementation.

This patch adds only a few tests with basic send() and recv() that
do not fail.

The following patches will add more test cases for SO_OOBINLINE, SIGURG,
EPOLLPRI, and SIOCATMARK.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Kuniyuki Iwashima 2024-06-24 18:36:36 -07:00 committed by Paolo Abeni
parent 7d139181a8
commit d098d77232
2 changed files with 221 additions and 1 deletions
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2
tools/testing/selftests/net/af_unix/Makefile
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@ -1,4 +1,4 @@
CFLAGS += $(KHDR_INCLUDES)
TEST_GEN_PROGS := diag_uid scm_pidfd scm_rights unix_connect
TEST_GEN_PROGS := diag_uid msg_oob scm_pidfd scm_rights unix_connect
include ../../lib.mk

220
tools/testing/selftests/net/af_unix/msg_oob.c Normal file
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@ -0,0 +1,220 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright Amazon.com Inc. or its affiliates. */
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include "../../kselftest_harness.h"
#define BUF_SZ 32
FIXTURE(msg_oob)
{
int fd[4]; /* 0: AF_UNIX sender
* 1: AF_UNIX receiver
* 2: TCP sender
* 3: TCP receiver
*/
};
static void create_unix_socketpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self)
{
int ret;
ret = socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0, self->fd);
ASSERT_EQ(ret, 0);
}
static void create_tcp_socketpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self)
{
struct sockaddr_in addr;
socklen_t addrlen;
int listen_fd;
int ret;
listen_fd = socket(AF_INET, SOCK_STREAM, 0);
ASSERT_GE(listen_fd, 0);
ret = listen(listen_fd, -1);
ASSERT_EQ(ret, 0);
addrlen = sizeof(addr);
ret = getsockname(listen_fd, (struct sockaddr *)&addr, &addrlen);
ASSERT_EQ(ret, 0);
self->fd[2] = socket(AF_INET, SOCK_STREAM, 0);
ASSERT_GE(self->fd[2], 0);
ret = connect(self->fd[2], (struct sockaddr *)&addr, addrlen);
ASSERT_EQ(ret, 0);
self->fd[3] = accept(listen_fd, (struct sockaddr *)&addr, &addrlen);
ASSERT_GE(self->fd[3], 0);
ret = fcntl(self->fd[3], F_SETFL, O_NONBLOCK);
ASSERT_EQ(ret, 0);
}
static void close_sockets(FIXTURE_DATA(msg_oob) *self)
{
int i;
for (i = 0; i < 4; i++)
close(self->fd[i]);
}
FIXTURE_SETUP(msg_oob)
{
create_unix_socketpair(_metadata, self);
create_tcp_socketpair(_metadata, self);
}
FIXTURE_TEARDOWN(msg_oob)
{
close_sockets(self);
}
static void __sendpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self,
const void *buf, size_t len, int flags)
{
int i, ret[2];
for (i = 0; i < 2; i++)
ret[i] = send(self->fd[i * 2], buf, len, flags);
ASSERT_EQ(ret[0], len);
ASSERT_EQ(ret[0], ret[1]);
}
static void __recvpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self,
const void *expected_buf, int expected_len,
int buf_len, int flags)
{
int i, ret[2], recv_errno[2], expected_errno = 0;
char recv_buf[2][BUF_SZ] = {};
ASSERT_GE(BUF_SZ, buf_len);
errno = 0;
for (i = 0; i < 2; i++) {
ret[i] = recv(self->fd[i * 2 + 1], recv_buf[i], buf_len, flags);
recv_errno[i] = errno;
}
if (expected_len < 0) {
expected_errno = -expected_len;
expected_len = -1;
}
if (ret[0] != expected_len || recv_errno[0] != expected_errno) {
TH_LOG("AF_UNIX :%s", ret[0] < 0 ? strerror(recv_errno[0]) : recv_buf[0]);
TH_LOG("Expected:%s", expected_errno ? strerror(expected_errno) : expected_buf);
ASSERT_EQ(ret[0], expected_len);
ASSERT_EQ(recv_errno[0], expected_errno);
}
if (ret[0] != ret[1] || recv_errno[0] != recv_errno[1]) {
TH_LOG("AF_UNIX :%s", ret[0] < 0 ? strerror(recv_errno[0]) : recv_buf[0]);
TH_LOG("TCP :%s", ret[1] < 0 ? strerror(recv_errno[1]) : recv_buf[1]);
ASSERT_EQ(ret[0], ret[1]);
ASSERT_EQ(recv_errno[0], recv_errno[1]);
}
if (expected_len >= 0) {
int cmp;
cmp = strncmp(expected_buf, recv_buf[0], expected_len);
if (cmp) {
TH_LOG("AF_UNIX :%s", ret[0] < 0 ? strerror(recv_errno[0]) : recv_buf[0]);
TH_LOG("Expected:%s", expected_errno ? strerror(expected_errno) : expected_buf);
ASSERT_EQ(cmp, 0);
}
cmp = strncmp(recv_buf[0], recv_buf[1], expected_len);
if (cmp) {
TH_LOG("AF_UNIX :%s", ret[0] < 0 ? strerror(recv_errno[0]) : recv_buf[0]);
TH_LOG("TCP :%s", ret[1] < 0 ? strerror(recv_errno[1]) : recv_buf[1]);
ASSERT_EQ(cmp, 0);
}
}
}
#define sendpair(buf, len, flags) \
__sendpair(_metadata, self, buf, len, flags)
#define recvpair(expected_buf, expected_len, buf_len, flags) \
__recvpair(_metadata, self, \
expected_buf, expected_len, buf_len, flags)
TEST_F(msg_oob, non_oob)
{
sendpair("x", 1, 0);
recvpair("", -EINVAL, 1, MSG_OOB);
}
TEST_F(msg_oob, oob)
{
sendpair("x", 1, MSG_OOB);
recvpair("x", 1, 1, MSG_OOB);
}
TEST_F(msg_oob, oob_drop)
{
sendpair("x", 1, MSG_OOB);
recvpair("", -EAGAIN, 1, 0); /* Drop OOB. */
recvpair("", -EINVAL, 1, MSG_OOB);
}
TEST_F(msg_oob, oob_ahead)
{
sendpair("hello", 5, MSG_OOB);
recvpair("o", 1, 1, MSG_OOB);
recvpair("hell", 4, 4, 0);
}
TEST_F(msg_oob, oob_break)
{
sendpair("hello", 5, MSG_OOB);
recvpair("hell", 4, 5, 0); /* Break at OOB even with enough buffer. */
recvpair("o", 1, 1, MSG_OOB);
}
TEST_F(msg_oob, oob_ahead_break)
{
sendpair("hello", 5, MSG_OOB);
sendpair("world", 5, 0);
recvpair("o", 1, 1, MSG_OOB);
recvpair("hell", 4, 9, 0); /* Break at OOB even after it's recv()ed. */
recvpair("world", 5, 5, 0);
}
TEST_F(msg_oob, oob_break_drop)
{
sendpair("hello", 5, MSG_OOB);
sendpair("world", 5, 0);
recvpair("hell", 4, 10, 0); /* Break at OOB even with enough buffer. */
recvpair("world", 5, 10, 0); /* Drop OOB and recv() the next skb. */
recvpair("", -EINVAL, 1, MSG_OOB);
}
TEST_HARNESS_MAIN