/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef UTIL_H
#define UTIL_H

#include <sys/socket.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/vm_sockets.h>

/* All known vsock transports, see callers of vsock_core_register() */
#define KNOWN_TRANSPORTS(x)             \
        x(LOOPBACK, "loopback")         \
        x(VIRTIO, "virtio")             \
        x(VHOST, "vhost")               \
        x(VMCI, "vmci")                 \
        x(HYPERV, "hvs")

enum transport {
        TRANSPORT_COUNTER_BASE = __COUNTER__ + 1,
        #define x(name, symbol)         \
                TRANSPORT_##name = BIT(__COUNTER__ - TRANSPORT_COUNTER_BASE),
        KNOWN_TRANSPORTS(x)
        TRANSPORT_NUM = __COUNTER__ - TRANSPORT_COUNTER_BASE,
        #undef x
};

static const char * const transport_ksyms[] = {
        #define x(name, symbol) " " symbol "_transport",
        KNOWN_TRANSPORTS(x)
        #undef x
};

static_assert(ARRAY_SIZE(transport_ksyms) == TRANSPORT_NUM);
static_assert(BITS_PER_TYPE(int) >= TRANSPORT_NUM);

#define TRANSPORTS_G2H   (TRANSPORT_VIRTIO | TRANSPORT_VMCI | TRANSPORT_HYPERV)
#define TRANSPORTS_H2G   (TRANSPORT_VHOST | TRANSPORT_VMCI)
#define TRANSPORTS_LOCAL (TRANSPORT_LOOPBACK)

/* Tests can either run as the client or the server */
enum test_mode {
        TEST_MODE_UNSET,
        TEST_MODE_CLIENT,
        TEST_MODE_SERVER
};

#define DEFAULT_PEER_PORT       1234

/* Test runner options */
struct test_opts {
        enum test_mode mode;
        unsigned int peer_cid;
        unsigned int peer_port;
};

/* A test case definition.  Test functions must print failures to stderr and
 * terminate with exit(EXIT_FAILURE).
 */
struct test_case {
        const char *name; /* human-readable name */

        /* Called when test mode is TEST_MODE_CLIENT */
        void (*run_client)(const struct test_opts *opts);

        /* Called when test mode is TEST_MODE_SERVER */
        void (*run_server)(const struct test_opts *opts);

        bool skip;
};

void init_signals(void);
unsigned int parse_cid(const char *str);
unsigned int parse_port(const char *str);
int vsock_connect_fd(int fd, unsigned int cid, unsigned int port);
int vsock_connect(unsigned int cid, unsigned int port, int type);
int vsock_accept(unsigned int cid, unsigned int port,
                 struct sockaddr_vm *clientaddrp, int type);
int vsock_stream_connect(unsigned int cid, unsigned int port);
int vsock_bind_try(unsigned int cid, unsigned int port, int type);
int vsock_bind(unsigned int cid, unsigned int port, int type);
int vsock_bind_connect(unsigned int cid, unsigned int port,
                       unsigned int bind_port, int type);
int vsock_seqpacket_connect(unsigned int cid, unsigned int port);
int vsock_stream_accept(unsigned int cid, unsigned int port,
                        struct sockaddr_vm *clientaddrp);
int vsock_stream_listen(unsigned int cid, unsigned int port);
int vsock_seqpacket_accept(unsigned int cid, unsigned int port,
                           struct sockaddr_vm *clientaddrp);
void vsock_wait_remote_close(int fd);
bool vsock_ioctl_int(int fd, unsigned long op, int expected);
bool vsock_wait_sent(int fd);
void send_buf(int fd, const void *buf, size_t len, int flags,
              ssize_t expected_ret);
void recv_buf(int fd, void *buf, size_t len, int flags, ssize_t expected_ret);
void send_byte(int fd, int expected_ret, int flags);
void recv_byte(int fd, int expected_ret, int flags);
void run_tests(const struct test_case *test_cases,
               const struct test_opts *opts);
void list_tests(const struct test_case *test_cases);
void skip_test(struct test_case *test_cases, size_t test_cases_len,
               const char *test_id_str);
void pick_test(struct test_case *test_cases, size_t test_cases_len,
               const char *test_id_str);
unsigned long hash_djb2(const void *data, size_t len);
size_t iovec_bytes(const struct iovec *iov, size_t iovnum);
unsigned long iovec_hash_djb2(const struct iovec *iov, size_t iovnum);
struct iovec *alloc_test_iovec(const struct iovec *test_iovec, int iovnum);
void free_test_iovec(const struct iovec *test_iovec,
                     struct iovec *iovec, int iovnum);
void setsockopt_ull_check(int fd, int level, int optname,
                          unsigned long long val, char const *errmsg);
void setsockopt_int_check(int fd, int level, int optname, int val,
                          char const *errmsg);
void setsockopt_timeval_check(int fd, int level, int optname,
                              struct timeval val, char const *errmsg);
void enable_so_zerocopy_check(int fd);
void enable_so_linger(int fd, int timeout);
int get_transports(void);
#endif /* UTIL_H */