Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1405 insertions, 0 deletions

diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
new file mode 100644
index 0000000000..5dc7767039
--- /dev/null
+++ b/tools/testing/vsock/vsock_test.c
@@ -0,0 +1,1405 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * vsock_test - vsock.ko test suite
+ *
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * Author: Stefan Hajnoczi <stefanha@redhat.com>
+ */
+
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <linux/kernel.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <time.h>
+#include <sys/mman.h>
+#include <poll.h>
+
+#include "timeout.h"
+#include "control.h"
+#include "util.h"
+
+static void test_stream_connection_reset(const struct test_opts *opts)
+{
+	union {
+		struct sockaddr sa;
+		struct sockaddr_vm svm;
+	} addr = {
+		.svm = {
+			.svm_family = AF_VSOCK,
+			.svm_port = 1234,
+			.svm_cid = opts->peer_cid,
+		},
+	};
+	int ret;
+	int fd;
+
+	fd = socket(AF_VSOCK, SOCK_STREAM, 0);
+
+	timeout_begin(TIMEOUT);
+	do {
+		ret = connect(fd, &addr.sa, sizeof(addr.svm));
+		timeout_check("connect");
+	} while (ret < 0 && errno == EINTR);
+	timeout_end();
+
+	if (ret != -1) {
+		fprintf(stderr, "expected connect(2) failure, got %d\n", ret);
+		exit(EXIT_FAILURE);
+	}
+	if (errno != ECONNRESET) {
+		fprintf(stderr, "unexpected connect(2) errno %d\n", errno);
+		exit(EXIT_FAILURE);
+	}
+
+	close(fd);
+}
+
+static void test_stream_bind_only_client(const struct test_opts *opts)
+{
+	union {
+		struct sockaddr sa;
+		struct sockaddr_vm svm;
+	} addr = {
+		.svm = {
+			.svm_family = AF_VSOCK,
+			.svm_port = 1234,
+			.svm_cid = opts->peer_cid,
+		},
+	};
+	int ret;
+	int fd;
+
+	/* Wait for the server to be ready */
+	control_expectln("BIND");
+
+	fd = socket(AF_VSOCK, SOCK_STREAM, 0);
+
+	timeout_begin(TIMEOUT);
+	do {
+		ret = connect(fd, &addr.sa, sizeof(addr.svm));
+		timeout_check("connect");
+	} while (ret < 0 && errno == EINTR);
+	timeout_end();
+
+	if (ret != -1) {
+		fprintf(stderr, "expected connect(2) failure, got %d\n", ret);
+		exit(EXIT_FAILURE);
+	}
+	if (errno != ECONNRESET) {
+		fprintf(stderr, "unexpected connect(2) errno %d\n", errno);
+		exit(EXIT_FAILURE);
+	}
+
+	/* Notify the server that the client has finished */
+	control_writeln("DONE");
+
+	close(fd);
+}
+
+static void test_stream_bind_only_server(const struct test_opts *opts)
+{
+	union {
+		struct sockaddr sa;
+		struct sockaddr_vm svm;
+	} addr = {
+		.svm = {
+			.svm_family = AF_VSOCK,
+			.svm_port = 1234,
+			.svm_cid = VMADDR_CID_ANY,
+		},
+	};
+	int fd;
+
+	fd = socket(AF_VSOCK, SOCK_STREAM, 0);
+
+	if (bind(fd, &addr.sa, sizeof(addr.svm)) < 0) {
+		perror("bind");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Notify the client that the server is ready */
+	control_writeln("BIND");
+
+	/* Wait for the client to finish */
+	control_expectln("DONE");
+
+	close(fd);
+}
+
+static void test_stream_client_close_client(const struct test_opts *opts)
+{
+	int fd;
+
+	fd = vsock_stream_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	send_byte(fd, 1, 0);
+	close(fd);
+}
+
+static void test_stream_client_close_server(const struct test_opts *opts)
+{
+	int fd;
+
+	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Wait for the remote to close the connection, before check
+	 * -EPIPE error on send.
+	 */
+	vsock_wait_remote_close(fd);
+
+	send_byte(fd, -EPIPE, 0);
+	recv_byte(fd, 1, 0);
+	recv_byte(fd, 0, 0);
+	close(fd);
+}
+
+static void test_stream_server_close_client(const struct test_opts *opts)
+{
+	int fd;
+
+	fd = vsock_stream_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Wait for the remote to close the connection, before check
+	 * -EPIPE error on send.
+	 */
+	vsock_wait_remote_close(fd);
+
+	send_byte(fd, -EPIPE, 0);
+	recv_byte(fd, 1, 0);
+	recv_byte(fd, 0, 0);
+	close(fd);
+}
+
+static void test_stream_server_close_server(const struct test_opts *opts)
+{
+	int fd;
+
+	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	send_byte(fd, 1, 0);
+	close(fd);
+}
+
+/* With the standard socket sizes, VMCI is able to support about 100
+ * concurrent stream connections.
+ */
+#define MULTICONN_NFDS 100
+
+static void test_stream_multiconn_client(const struct test_opts *opts)
+{
+	int fds[MULTICONN_NFDS];
+	int i;
+
+	for (i = 0; i < MULTICONN_NFDS; i++) {
+		fds[i] = vsock_stream_connect(opts->peer_cid, 1234);
+		if (fds[i] < 0) {
+			perror("connect");
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	for (i = 0; i < MULTICONN_NFDS; i++) {
+		if (i % 2)
+			recv_byte(fds[i], 1, 0);
+		else
+			send_byte(fds[i], 1, 0);
+	}
+
+	for (i = 0; i < MULTICONN_NFDS; i++)
+		close(fds[i]);
+}
+
+static void test_stream_multiconn_server(const struct test_opts *opts)
+{
+	int fds[MULTICONN_NFDS];
+	int i;
+
+	for (i = 0; i < MULTICONN_NFDS; i++) {
+		fds[i] = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
+		if (fds[i] < 0) {
+			perror("accept");
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	for (i = 0; i < MULTICONN_NFDS; i++) {
+		if (i % 2)
+			send_byte(fds[i], 1, 0);
+		else
+			recv_byte(fds[i], 1, 0);
+	}
+
+	for (i = 0; i < MULTICONN_NFDS; i++)
+		close(fds[i]);
+}
+
+#define MSG_PEEK_BUF_LEN 64
+
+static void test_msg_peek_client(const struct test_opts *opts,
+				 bool seqpacket)
+{
+	unsigned char buf[MSG_PEEK_BUF_LEN];
+	ssize_t send_size;
+	int fd;
+	int i;
+
+	if (seqpacket)
+		fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+	else
+		fd = vsock_stream_connect(opts->peer_cid, 1234);
+
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	for (i = 0; i < sizeof(buf); i++)
+		buf[i] = rand() & 0xFF;
+
+	control_expectln("SRVREADY");
+
+	send_size = send(fd, buf, sizeof(buf), 0);
+
+	if (send_size < 0) {
+		perror("send");
+		exit(EXIT_FAILURE);
+	}
+
+	if (send_size != sizeof(buf)) {
+		fprintf(stderr, "Invalid send size %zi\n", send_size);
+		exit(EXIT_FAILURE);
+	}
+
+	close(fd);
+}
+
+static void test_msg_peek_server(const struct test_opts *opts,
+				 bool seqpacket)
+{
+	unsigned char buf_half[MSG_PEEK_BUF_LEN / 2];
+	unsigned char buf_normal[MSG_PEEK_BUF_LEN];
+	unsigned char buf_peek[MSG_PEEK_BUF_LEN];
+	ssize_t res;
+	int fd;
+
+	if (seqpacket)
+		fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+	else
+		fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
+
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Peek from empty socket. */
+	res = recv(fd, buf_peek, sizeof(buf_peek), MSG_PEEK | MSG_DONTWAIT);
+	if (res != -1) {
+		fprintf(stderr, "expected recv(2) failure, got %zi\n", res);
+		exit(EXIT_FAILURE);
+	}
+
+	if (errno != EAGAIN) {
+		perror("EAGAIN expected");
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("SRVREADY");
+
+	/* Peek part of data. */
+	res = recv(fd, buf_half, sizeof(buf_half), MSG_PEEK);
+	if (res != sizeof(buf_half)) {
+		fprintf(stderr, "recv(2) + MSG_PEEK, expected %zu, got %zi\n",
+			sizeof(buf_half), res);
+		exit(EXIT_FAILURE);
+	}
+
+	/* Peek whole data. */
+	res = recv(fd, buf_peek, sizeof(buf_peek), MSG_PEEK);
+	if (res != sizeof(buf_peek)) {
+		fprintf(stderr, "recv(2) + MSG_PEEK, expected %zu, got %zi\n",
+			sizeof(buf_peek), res);
+		exit(EXIT_FAILURE);
+	}
+
+	/* Compare partial and full peek. */
+	if (memcmp(buf_half, buf_peek, sizeof(buf_half))) {
+		fprintf(stderr, "Partial peek data mismatch\n");
+		exit(EXIT_FAILURE);
+	}
+
+	if (seqpacket) {
+		/* This type of socket supports MSG_TRUNC flag,
+		 * so check it with MSG_PEEK. We must get length
+		 * of the message.
+		 */
+		res = recv(fd, buf_half, sizeof(buf_half), MSG_PEEK |
+			   MSG_TRUNC);
+		if (res != sizeof(buf_peek)) {
+			fprintf(stderr,
+				"recv(2) + MSG_PEEK | MSG_TRUNC, exp %zu, got %zi\n",
+				sizeof(buf_half), res);
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	res = recv(fd, buf_normal, sizeof(buf_normal), 0);
+	if (res != sizeof(buf_normal)) {
+		fprintf(stderr, "recv(2), expected %zu, got %zi\n",
+			sizeof(buf_normal), res);
+		exit(EXIT_FAILURE);
+	}
+
+	/* Compare full peek and normal read. */
+	if (memcmp(buf_peek, buf_normal, sizeof(buf_peek))) {
+		fprintf(stderr, "Full peek data mismatch\n");
+		exit(EXIT_FAILURE);
+	}
+
+	close(fd);
+}
+
+static void test_stream_msg_peek_client(const struct test_opts *opts)
+{
+	return test_msg_peek_client(opts, false);
+}
+
+static void test_stream_msg_peek_server(const struct test_opts *opts)
+{
+	return test_msg_peek_server(opts, false);
+}
+
+#define SOCK_BUF_SIZE (2 * 1024 * 1024)
+#define MAX_MSG_PAGES 4
+
+static void test_seqpacket_msg_bounds_client(const struct test_opts *opts)
+{
+	unsigned long curr_hash;
+	size_t max_msg_size;
+	int page_size;
+	int msg_count;
+	int fd;
+
+	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Wait, until receiver sets buffer size. */
+	control_expectln("SRVREADY");
+
+	curr_hash = 0;
+	page_size = getpagesize();
+	max_msg_size = MAX_MSG_PAGES * page_size;
+	msg_count = SOCK_BUF_SIZE / max_msg_size;
+
+	for (int i = 0; i < msg_count; i++) {
+		ssize_t send_size;
+		size_t buf_size;
+		int flags;
+		void *buf;
+
+		/* Use "small" buffers and "big" buffers. */
+		if (i & 1)
+			buf_size = page_size +
+					(rand() % (max_msg_size - page_size));
+		else
+			buf_size = 1 + (rand() % page_size);
+
+		buf = malloc(buf_size);
+
+		if (!buf) {
+			perror("malloc");
+			exit(EXIT_FAILURE);
+		}
+
+		memset(buf, rand() & 0xff, buf_size);
+		/* Set at least one MSG_EOR + some random. */
+		if (i == (msg_count / 2) || (rand() & 1)) {
+			flags = MSG_EOR;
+			curr_hash++;
+		} else {
+			flags = 0;
+		}
+
+		send_size = send(fd, buf, buf_size, flags);
+
+		if (send_size < 0) {
+			perror("send");
+			exit(EXIT_FAILURE);
+		}
+
+		if (send_size != buf_size) {
+			fprintf(stderr, "Invalid send size\n");
+			exit(EXIT_FAILURE);
+		}
+
+		/*
+		 * Hash sum is computed at both client and server in
+		 * the same way:
+		 * H += hash('message data')
+		 * Such hash "controls" both data integrity and message
+		 * bounds. After data exchange, both sums are compared
+		 * using control socket, and if message bounds wasn't
+		 * broken - two values must be equal.
+		 */
+		curr_hash += hash_djb2(buf, buf_size);
+		free(buf);
+	}
+
+	control_writeln("SENDDONE");
+	control_writeulong(curr_hash);
+	close(fd);
+}
+
+static void test_seqpacket_msg_bounds_server(const struct test_opts *opts)
+{
+	unsigned long sock_buf_size;
+	unsigned long remote_hash;
+	unsigned long curr_hash;
+	int fd;
+	struct msghdr msg = {0};
+	struct iovec iov = {0};
+
+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	sock_buf_size = SOCK_BUF_SIZE;
+
+	if (setsockopt(fd, AF_VSOCK, SO_VM_SOCKETS_BUFFER_MAX_SIZE,
+		       &sock_buf_size, sizeof(sock_buf_size))) {
+		perror("setsockopt(SO_VM_SOCKETS_BUFFER_MAX_SIZE)");
+		exit(EXIT_FAILURE);
+	}
+
+	if (setsockopt(fd, AF_VSOCK, SO_VM_SOCKETS_BUFFER_SIZE,
+		       &sock_buf_size, sizeof(sock_buf_size))) {
+		perror("setsockopt(SO_VM_SOCKETS_BUFFER_SIZE)");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Ready to receive data. */
+	control_writeln("SRVREADY");
+	/* Wait, until peer sends whole data. */
+	control_expectln("SENDDONE");
+	iov.iov_len = MAX_MSG_PAGES * getpagesize();
+	iov.iov_base = malloc(iov.iov_len);
+	if (!iov.iov_base) {
+		perror("malloc");
+		exit(EXIT_FAILURE);
+	}
+
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	curr_hash = 0;
+
+	while (1) {
+		ssize_t recv_size;
+
+		recv_size = recvmsg(fd, &msg, 0);
+
+		if (!recv_size)
+			break;
+
+		if (recv_size < 0) {
+			perror("recvmsg");
+			exit(EXIT_FAILURE);
+		}
+
+		if (msg.msg_flags & MSG_EOR)
+			curr_hash++;
+
+		curr_hash += hash_djb2(msg.msg_iov[0].iov_base, recv_size);
+	}
+
+	free(iov.iov_base);
+	close(fd);
+	remote_hash = control_readulong();
+
+	if (curr_hash != remote_hash) {
+		fprintf(stderr, "Message bounds broken\n");
+		exit(EXIT_FAILURE);
+	}
+}
+
+#define MESSAGE_TRUNC_SZ 32
+static void test_seqpacket_msg_trunc_client(const struct test_opts *opts)
+{
+	int fd;
+	char buf[MESSAGE_TRUNC_SZ];
+
+	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	if (send(fd, buf, sizeof(buf), 0) != sizeof(buf)) {
+		perror("send failed");
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("SENDDONE");
+	close(fd);
+}
+
+static void test_seqpacket_msg_trunc_server(const struct test_opts *opts)
+{
+	int fd;
+	char buf[MESSAGE_TRUNC_SZ / 2];
+	struct msghdr msg = {0};
+	struct iovec iov = {0};
+
+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	control_expectln("SENDDONE");
+	iov.iov_base = buf;
+	iov.iov_len = sizeof(buf);
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	ssize_t ret = recvmsg(fd, &msg, MSG_TRUNC);
+
+	if (ret != MESSAGE_TRUNC_SZ) {
+		printf("%zi\n", ret);
+		perror("MSG_TRUNC doesn't work");
+		exit(EXIT_FAILURE);
+	}
+
+	if (!(msg.msg_flags & MSG_TRUNC)) {
+		fprintf(stderr, "MSG_TRUNC expected\n");
+		exit(EXIT_FAILURE);
+	}
+
+	close(fd);
+}
+
+static time_t current_nsec(void)
+{
+	struct timespec ts;
+
+	if (clock_gettime(CLOCK_REALTIME, &ts)) {
+		perror("clock_gettime(3) failed");
+		exit(EXIT_FAILURE);
+	}
+
+	return (ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
+}
+
+#define RCVTIMEO_TIMEOUT_SEC 1
+#define READ_OVERHEAD_NSEC 250000000 /* 0.25 sec */
+
+static void test_seqpacket_timeout_client(const struct test_opts *opts)
+{
+	int fd;
+	struct timeval tv;
+	char dummy;
+	time_t read_enter_ns;
+	time_t read_overhead_ns;
+
+	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	tv.tv_sec = RCVTIMEO_TIMEOUT_SEC;
+	tv.tv_usec = 0;
+
+	if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (void *)&tv, sizeof(tv)) == -1) {
+		perror("setsockopt(SO_RCVTIMEO)");
+		exit(EXIT_FAILURE);
+	}
+
+	read_enter_ns = current_nsec();
+
+	if (read(fd, &dummy, sizeof(dummy)) != -1) {
+		fprintf(stderr,
+			"expected 'dummy' read(2) failure\n");
+		exit(EXIT_FAILURE);
+	}
+
+	if (errno != EAGAIN) {
+		perror("EAGAIN expected");
+		exit(EXIT_FAILURE);
+	}
+
+	read_overhead_ns = current_nsec() - read_enter_ns -
+			1000000000ULL * RCVTIMEO_TIMEOUT_SEC;
+
+	if (read_overhead_ns > READ_OVERHEAD_NSEC) {
+		fprintf(stderr,
+			"too much time in read(2), %lu > %i ns\n",
+			read_overhead_ns, READ_OVERHEAD_NSEC);
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("WAITDONE");
+	close(fd);
+}
+
+static void test_seqpacket_timeout_server(const struct test_opts *opts)
+{
+	int fd;
+
+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	control_expectln("WAITDONE");
+	close(fd);
+}
+
+static void test_seqpacket_bigmsg_client(const struct test_opts *opts)
+{
+	unsigned long sock_buf_size;
+	ssize_t send_size;
+	socklen_t len;
+	void *data;
+	int fd;
+
+	len = sizeof(sock_buf_size);
+
+	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	if (getsockopt(fd, AF_VSOCK, SO_VM_SOCKETS_BUFFER_SIZE,
+		       &sock_buf_size, &len)) {
+		perror("getsockopt");
+		exit(EXIT_FAILURE);
+	}
+
+	sock_buf_size++;
+
+	data = malloc(sock_buf_size);
+	if (!data) {
+		perror("malloc");
+		exit(EXIT_FAILURE);
+	}
+
+	send_size = send(fd, data, sock_buf_size, 0);
+	if (send_size != -1) {
+		fprintf(stderr, "expected 'send(2)' failure, got %zi\n",
+			send_size);
+		exit(EXIT_FAILURE);
+	}
+
+	if (errno != EMSGSIZE) {
+		fprintf(stderr, "expected EMSGSIZE in 'errno', got %i\n",
+			errno);
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("CLISENT");
+
+	free(data);
+	close(fd);
+}
+
+static void test_seqpacket_bigmsg_server(const struct test_opts *opts)
+{
+	int fd;
+
+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	control_expectln("CLISENT");
+
+	close(fd);
+}
+
+#define BUF_PATTERN_1 'a'
+#define BUF_PATTERN_2 'b'
+
+static void test_seqpacket_invalid_rec_buffer_client(const struct test_opts *opts)
+{
+	int fd;
+	unsigned char *buf1;
+	unsigned char *buf2;
+	int buf_size = getpagesize() * 3;
+
+	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	buf1 = malloc(buf_size);
+	if (!buf1) {
+		perror("'malloc()' for 'buf1'");
+		exit(EXIT_FAILURE);
+	}
+
+	buf2 = malloc(buf_size);
+	if (!buf2) {
+		perror("'malloc()' for 'buf2'");
+		exit(EXIT_FAILURE);
+	}
+
+	memset(buf1, BUF_PATTERN_1, buf_size);
+	memset(buf2, BUF_PATTERN_2, buf_size);
+
+	if (send(fd, buf1, buf_size, 0) != buf_size) {
+		perror("send failed");
+		exit(EXIT_FAILURE);
+	}
+
+	if (send(fd, buf2, buf_size, 0) != buf_size) {
+		perror("send failed");
+		exit(EXIT_FAILURE);
+	}
+
+	close(fd);
+}
+
+static void test_seqpacket_invalid_rec_buffer_server(const struct test_opts *opts)
+{
+	int fd;
+	unsigned char *broken_buf;
+	unsigned char *valid_buf;
+	int page_size = getpagesize();
+	int buf_size = page_size * 3;
+	ssize_t res;
+	int prot = PROT_READ | PROT_WRITE;
+	int flags = MAP_PRIVATE | MAP_ANONYMOUS;
+	int i;
+
+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Setup first buffer. */
+	broken_buf = mmap(NULL, buf_size, prot, flags, -1, 0);
+	if (broken_buf == MAP_FAILED) {
+		perror("mmap for 'broken_buf'");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Unmap "hole" in buffer. */
+	if (munmap(broken_buf + page_size, page_size)) {
+		perror("'broken_buf' setup");
+		exit(EXIT_FAILURE);
+	}
+
+	valid_buf = mmap(NULL, buf_size, prot, flags, -1, 0);
+	if (valid_buf == MAP_FAILED) {
+		perror("mmap for 'valid_buf'");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Try to fill buffer with unmapped middle. */
+	res = read(fd, broken_buf, buf_size);
+	if (res != -1) {
+		fprintf(stderr,
+			"expected 'broken_buf' read(2) failure, got %zi\n",
+			res);
+		exit(EXIT_FAILURE);
+	}
+
+	if (errno != EFAULT) {
+		perror("unexpected errno of 'broken_buf'");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Try to fill valid buffer. */
+	res = read(fd, valid_buf, buf_size);
+	if (res < 0) {
+		perror("unexpected 'valid_buf' read(2) failure");
+		exit(EXIT_FAILURE);
+	}
+
+	if (res != buf_size) {
+		fprintf(stderr,
+			"invalid 'valid_buf' read(2), expected %i, got %zi\n",
+			buf_size, res);
+		exit(EXIT_FAILURE);
+	}
+
+	for (i = 0; i < buf_size; i++) {
+		if (valid_buf[i] != BUF_PATTERN_2) {
+			fprintf(stderr,
+				"invalid pattern for 'valid_buf' at %i, expected %hhX, got %hhX\n",
+				i, BUF_PATTERN_2, valid_buf[i]);
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	/* Unmap buffers. */
+	munmap(broken_buf, page_size);
+	munmap(broken_buf + page_size * 2, page_size);
+	munmap(valid_buf, buf_size);
+	close(fd);
+}
+
+#define RCVLOWAT_BUF_SIZE 128
+
+static void test_stream_poll_rcvlowat_server(const struct test_opts *opts)
+{
+	int fd;
+	int i;
+
+	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Send 1 byte. */
+	send_byte(fd, 1, 0);
+
+	control_writeln("SRVSENT");
+
+	/* Wait until client is ready to receive rest of data. */
+	control_expectln("CLNSENT");
+
+	for (i = 0; i < RCVLOWAT_BUF_SIZE - 1; i++)
+		send_byte(fd, 1, 0);
+
+	/* Keep socket in active state. */
+	control_expectln("POLLDONE");
+
+	close(fd);
+}
+
+static void test_stream_poll_rcvlowat_client(const struct test_opts *opts)
+{
+	unsigned long lowat_val = RCVLOWAT_BUF_SIZE;
+	char buf[RCVLOWAT_BUF_SIZE];
+	struct pollfd fds;
+	ssize_t read_res;
+	short poll_flags;
+	int fd;
+
+	fd = vsock_stream_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	if (setsockopt(fd, SOL_SOCKET, SO_RCVLOWAT,
+		       &lowat_val, sizeof(lowat_val))) {
+		perror("setsockopt(SO_RCVLOWAT)");
+		exit(EXIT_FAILURE);
+	}
+
+	control_expectln("SRVSENT");
+
+	/* At this point, server sent 1 byte. */
+	fds.fd = fd;
+	poll_flags = POLLIN | POLLRDNORM;
+	fds.events = poll_flags;
+
+	/* Try to wait for 1 sec. */
+	if (poll(&fds, 1, 1000) < 0) {
+		perror("poll");
+		exit(EXIT_FAILURE);
+	}
+
+	/* poll() must return nothing. */
+	if (fds.revents) {
+		fprintf(stderr, "Unexpected poll result %hx\n",
+			fds.revents);
+		exit(EXIT_FAILURE);
+	}
+
+	/* Tell server to send rest of data. */
+	control_writeln("CLNSENT");
+
+	/* Poll for data. */
+	if (poll(&fds, 1, 10000) < 0) {
+		perror("poll");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Only these two bits are expected. */
+	if (fds.revents != poll_flags) {
+		fprintf(stderr, "Unexpected poll result %hx\n",
+			fds.revents);
+		exit(EXIT_FAILURE);
+	}
+
+	/* Use MSG_DONTWAIT, if call is going to wait, EAGAIN
+	 * will be returned.
+	 */
+	read_res = recv(fd, buf, sizeof(buf), MSG_DONTWAIT);
+	if (read_res != RCVLOWAT_BUF_SIZE) {
+		fprintf(stderr, "Unexpected recv result %zi\n",
+			read_res);
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("POLLDONE");
+
+	close(fd);
+}
+
+#define INV_BUF_TEST_DATA_LEN 512
+
+static void test_inv_buf_client(const struct test_opts *opts, bool stream)
+{
+	unsigned char data[INV_BUF_TEST_DATA_LEN] = {0};
+	ssize_t ret;
+	int fd;
+
+	if (stream)
+		fd = vsock_stream_connect(opts->peer_cid, 1234);
+	else
+		fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	control_expectln("SENDDONE");
+
+	/* Use invalid buffer here. */
+	ret = recv(fd, NULL, sizeof(data), 0);
+	if (ret != -1) {
+		fprintf(stderr, "expected recv(2) failure, got %zi\n", ret);
+		exit(EXIT_FAILURE);
+	}
+
+	if (errno != EFAULT) {
+		fprintf(stderr, "unexpected recv(2) errno %d\n", errno);
+		exit(EXIT_FAILURE);
+	}
+
+	ret = recv(fd, data, sizeof(data), MSG_DONTWAIT);
+
+	if (stream) {
+		/* For SOCK_STREAM we must continue reading. */
+		if (ret != sizeof(data)) {
+			fprintf(stderr, "expected recv(2) success, got %zi\n", ret);
+			exit(EXIT_FAILURE);
+		}
+		/* Don't check errno in case of success. */
+	} else {
+		/* For SOCK_SEQPACKET socket's queue must be empty. */
+		if (ret != -1) {
+			fprintf(stderr, "expected recv(2) failure, got %zi\n", ret);
+			exit(EXIT_FAILURE);
+		}
+
+		if (errno != EAGAIN) {
+			fprintf(stderr, "unexpected recv(2) errno %d\n", errno);
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	control_writeln("DONE");
+
+	close(fd);
+}
+
+static void test_inv_buf_server(const struct test_opts *opts, bool stream)
+{
+	unsigned char data[INV_BUF_TEST_DATA_LEN] = {0};
+	ssize_t res;
+	int fd;
+
+	if (stream)
+		fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
+	else
+		fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	res = send(fd, data, sizeof(data), 0);
+	if (res != sizeof(data)) {
+		fprintf(stderr, "unexpected send(2) result %zi\n", res);
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("SENDDONE");
+
+	control_expectln("DONE");
+
+	close(fd);
+}
+
+static void test_stream_inv_buf_client(const struct test_opts *opts)
+{
+	test_inv_buf_client(opts, true);
+}
+
+static void test_stream_inv_buf_server(const struct test_opts *opts)
+{
+	test_inv_buf_server(opts, true);
+}
+
+static void test_seqpacket_inv_buf_client(const struct test_opts *opts)
+{
+	test_inv_buf_client(opts, false);
+}
+
+static void test_seqpacket_inv_buf_server(const struct test_opts *opts)
+{
+	test_inv_buf_server(opts, false);
+}
+
+#define HELLO_STR "HELLO"
+#define WORLD_STR "WORLD"
+
+static void test_stream_virtio_skb_merge_client(const struct test_opts *opts)
+{
+	ssize_t res;
+	int fd;
+
+	fd = vsock_stream_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Send first skbuff. */
+	res = send(fd, HELLO_STR, strlen(HELLO_STR), 0);
+	if (res != strlen(HELLO_STR)) {
+		fprintf(stderr, "unexpected send(2) result %zi\n", res);
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("SEND0");
+	/* Peer reads part of first skbuff. */
+	control_expectln("REPLY0");
+
+	/* Send second skbuff, it will be appended to the first. */
+	res = send(fd, WORLD_STR, strlen(WORLD_STR), 0);
+	if (res != strlen(WORLD_STR)) {
+		fprintf(stderr, "unexpected send(2) result %zi\n", res);
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("SEND1");
+	/* Peer reads merged skbuff packet. */
+	control_expectln("REPLY1");
+
+	close(fd);
+}
+
+static void test_stream_virtio_skb_merge_server(const struct test_opts *opts)
+{
+	unsigned char buf[64];
+	ssize_t res;
+	int fd;
+
+	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	control_expectln("SEND0");
+
+	/* Read skbuff partially. */
+	res = recv(fd, buf, 2, 0);
+	if (res != 2) {
+		fprintf(stderr, "expected recv(2) returns 2 bytes, got %zi\n", res);
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("REPLY0");
+	control_expectln("SEND1");
+
+	res = recv(fd, buf + 2, sizeof(buf) - 2, 0);
+	if (res != 8) {
+		fprintf(stderr, "expected recv(2) returns 8 bytes, got %zi\n", res);
+		exit(EXIT_FAILURE);
+	}
+
+	res = recv(fd, buf, sizeof(buf) - 8 - 2, MSG_DONTWAIT);
+	if (res != -1) {
+		fprintf(stderr, "expected recv(2) failure, got %zi\n", res);
+		exit(EXIT_FAILURE);
+	}
+
+	if (memcmp(buf, HELLO_STR WORLD_STR, strlen(HELLO_STR WORLD_STR))) {
+		fprintf(stderr, "pattern mismatch\n");
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("REPLY1");
+
+	close(fd);
+}
+
+static void test_seqpacket_msg_peek_client(const struct test_opts *opts)
+{
+	return test_msg_peek_client(opts, true);
+}
+
+static void test_seqpacket_msg_peek_server(const struct test_opts *opts)
+{
+	return test_msg_peek_server(opts, true);
+}
+
+static struct test_case test_cases[] = {
+	{
+		.name = "SOCK_STREAM connection reset",
+		.run_client = test_stream_connection_reset,
+	},
+	{
+		.name = "SOCK_STREAM bind only",
+		.run_client = test_stream_bind_only_client,
+		.run_server = test_stream_bind_only_server,
+	},
+	{
+		.name = "SOCK_STREAM client close",
+		.run_client = test_stream_client_close_client,
+		.run_server = test_stream_client_close_server,
+	},
+	{
+		.name = "SOCK_STREAM server close",
+		.run_client = test_stream_server_close_client,
+		.run_server = test_stream_server_close_server,
+	},
+	{
+		.name = "SOCK_STREAM multiple connections",
+		.run_client = test_stream_multiconn_client,
+		.run_server = test_stream_multiconn_server,
+	},
+	{
+		.name = "SOCK_STREAM MSG_PEEK",
+		.run_client = test_stream_msg_peek_client,
+		.run_server = test_stream_msg_peek_server,
+	},
+	{
+		.name = "SOCK_SEQPACKET msg bounds",
+		.run_client = test_seqpacket_msg_bounds_client,
+		.run_server = test_seqpacket_msg_bounds_server,
+	},
+	{
+		.name = "SOCK_SEQPACKET MSG_TRUNC flag",
+		.run_client = test_seqpacket_msg_trunc_client,
+		.run_server = test_seqpacket_msg_trunc_server,
+	},
+	{
+		.name = "SOCK_SEQPACKET timeout",
+		.run_client = test_seqpacket_timeout_client,
+		.run_server = test_seqpacket_timeout_server,
+	},
+	{
+		.name = "SOCK_SEQPACKET invalid receive buffer",
+		.run_client = test_seqpacket_invalid_rec_buffer_client,
+		.run_server = test_seqpacket_invalid_rec_buffer_server,
+	},
+	{
+		.name = "SOCK_STREAM poll() + SO_RCVLOWAT",
+		.run_client = test_stream_poll_rcvlowat_client,
+		.run_server = test_stream_poll_rcvlowat_server,
+	},
+	{
+		.name = "SOCK_SEQPACKET big message",
+		.run_client = test_seqpacket_bigmsg_client,
+		.run_server = test_seqpacket_bigmsg_server,
+	},
+	{
+		.name = "SOCK_STREAM test invalid buffer",
+		.run_client = test_stream_inv_buf_client,
+		.run_server = test_stream_inv_buf_server,
+	},
+	{
+		.name = "SOCK_SEQPACKET test invalid buffer",
+		.run_client = test_seqpacket_inv_buf_client,
+		.run_server = test_seqpacket_inv_buf_server,
+	},
+	{
+		.name = "SOCK_STREAM virtio skb merge",
+		.run_client = test_stream_virtio_skb_merge_client,
+		.run_server = test_stream_virtio_skb_merge_server,
+	},
+	{
+		.name = "SOCK_SEQPACKET MSG_PEEK",
+		.run_client = test_seqpacket_msg_peek_client,
+		.run_server = test_seqpacket_msg_peek_server,
+	},
+	{},
+};
+
+static const char optstring[] = "";
+static const struct option longopts[] = {
+	{
+		.name = "control-host",
+		.has_arg = required_argument,
+		.val = 'H',
+	},
+	{
+		.name = "control-port",
+		.has_arg = required_argument,
+		.val = 'P',
+	},
+	{
+		.name = "mode",
+		.has_arg = required_argument,
+		.val = 'm',
+	},
+	{
+		.name = "peer-cid",
+		.has_arg = required_argument,
+		.val = 'p',
+	},
+	{
+		.name = "list",
+		.has_arg = no_argument,
+		.val = 'l',
+	},
+	{
+		.name = "skip",
+		.has_arg = required_argument,
+		.val = 's',
+	},
+	{
+		.name = "help",
+		.has_arg = no_argument,
+		.val = '?',
+	},
+	{},
+};
+
+static void usage(void)
+{
+	fprintf(stderr, "Usage: vsock_test [--help] [--control-host=<host>] --control-port=<port> --mode=client|server --peer-cid=<cid> [--list] [--skip=<test_id>]\n"
+		"\n"
+		"  Server: vsock_test --control-port=1234 --mode=server --peer-cid=3\n"
+		"  Client: vsock_test --control-host=192.168.0.1 --control-port=1234 --mode=client --peer-cid=2\n"
+		"\n"
+		"Run vsock.ko tests.  Must be launched in both guest\n"
+		"and host.  One side must use --mode=client and\n"
+		"the other side must use --mode=server.\n"
+		"\n"
+		"A TCP control socket connection is used to coordinate tests\n"
+		"between the client and the server.  The server requires a\n"
+		"listen address and the client requires an address to\n"
+		"connect to.\n"
+		"\n"
+		"The CID of the other side must be given with --peer-cid=<cid>.\n"
+		"\n"
+		"Options:\n"
+		"  --help                 This help message\n"
+		"  --control-host <host>  Server IP address to connect to\n"
+		"  --control-port <port>  Server port to listen on/connect to\n"
+		"  --mode client|server   Server or client mode\n"
+		"  --peer-cid <cid>       CID of the other side\n"
+		"  --list                 List of tests that will be executed\n"
+		"  --skip <test_id>       Test ID to skip;\n"
+		"                         use multiple --skip options to skip more tests\n"
+		);
+	exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv)
+{
+	const char *control_host = NULL;
+	const char *control_port = NULL;
+	struct test_opts opts = {
+		.mode = TEST_MODE_UNSET,
+		.peer_cid = VMADDR_CID_ANY,
+	};
+
+	srand(time(NULL));
+	init_signals();
+
+	for (;;) {
+		int opt = getopt_long(argc, argv, optstring, longopts, NULL);
+
+		if (opt == -1)
+			break;
+
+		switch (opt) {
+		case 'H':
+			control_host = optarg;
+			break;
+		case 'm':
+			if (strcmp(optarg, "client") == 0)
+				opts.mode = TEST_MODE_CLIENT;
+			else if (strcmp(optarg, "server") == 0)
+				opts.mode = TEST_MODE_SERVER;
+			else {
+				fprintf(stderr, "--mode must be \"client\" or \"server\"\n");
+				return EXIT_FAILURE;
+			}
+			break;
+		case 'p':
+			opts.peer_cid = parse_cid(optarg);
+			break;
+		case 'P':
+			control_port = optarg;
+			break;
+		case 'l':
+			list_tests(test_cases);
+			break;
+		case 's':
+			skip_test(test_cases, ARRAY_SIZE(test_cases) - 1,
+				  optarg);
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	}
+
+	if (!control_port)
+		usage();
+	if (opts.mode == TEST_MODE_UNSET)
+		usage();
+	if (opts.peer_cid == VMADDR_CID_ANY)
+		usage();
+
+	if (!control_host) {
+		if (opts.mode != TEST_MODE_SERVER)
+			usage();
+		control_host = "0.0.0.0";
+	}
+
+	control_init(control_host, control_port,
+		     opts.mode == TEST_MODE_SERVER);
+
+	run_tests(test_cases, &opts);
+
+	control_cleanup();
+	return EXIT_SUCCESS;
+}