// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2021 Samsung Electrnoics
 * Bongsu Jeon <bongsu.jeon@samsung.com>
 *
 * Test code for nci
 */

#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <pthread.h>
#include <linux/genetlink.h>
#include <sys/socket.h>
#include <linux/nfc.h>

#include "../kselftest_harness.h"

#define GENLMSG_DATA(glh)	((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
#define GENLMSG_PAYLOAD(glh)	(NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
#define NLA_DATA(na)		((void *)((char *)(na) + NLA_HDRLEN))
#define NLA_PAYLOAD(len)	((len) - NLA_HDRLEN)

#define MAX_MSG_SIZE	1024

#define IOCTL_GET_NCIDEV_IDX	0
#define VIRTUAL_NFC_PROTOCOLS	(NFC_PROTO_JEWEL_MASK | \
				 NFC_PROTO_MIFARE_MASK | \
				 NFC_PROTO_FELICA_MASK | \
				 NFC_PROTO_ISO14443_MASK | \
				 NFC_PROTO_ISO14443_B_MASK | \
				 NFC_PROTO_ISO15693_MASK)

const __u8 nci_reset_cmd[] = {0x20, 0x00, 0x01, 0x01};
const __u8 nci_init_cmd[] = {0x20, 0x01, 0x00};
const __u8 nci_rf_discovery_cmd[] = {0x21, 0x03, 0x09, 0x04, 0x00, 0x01,
				      0x01, 0x01, 0x02, 0x01, 0x06, 0x01};
const __u8 nci_init_cmd_v2[] = {0x20, 0x01, 0x02, 0x00, 0x00};
const __u8 nci_rf_disc_map_cmd[] = {0x21, 0x00, 0x07, 0x02, 0x04, 0x03,
				     0x02, 0x05, 0x03, 0x03};
const __u8 nci_rf_deact_cmd[] = {0x21, 0x06, 0x01, 0x00};
const __u8 nci_reset_rsp[] = {0x40, 0x00, 0x03, 0x00, 0x10, 0x01};
const __u8 nci_reset_rsp_v2[] = {0x40, 0x00, 0x01, 0x00};
const __u8 nci_reset_ntf[] = {0x60, 0x00, 0x09, 0x02, 0x01, 0x20, 0x0e,
			       0x04, 0x61, 0x00, 0x04, 0x02};
const __u8 nci_init_rsp[] = {0x40, 0x01, 0x14, 0x00, 0x02, 0x0e, 0x02,
			      0x00, 0x03, 0x01, 0x02, 0x03, 0x02, 0xc8,
			      0x00, 0xff, 0x10, 0x00, 0x0e, 0x12, 0x00,
			      0x00, 0x04};
const __u8 nci_init_rsp_v2[] = {0x40, 0x01, 0x1c, 0x00, 0x1a, 0x7e, 0x06,
				 0x00, 0x02, 0x92, 0x04, 0xff, 0xff, 0x01,
				 0x00, 0x40, 0x06, 0x00, 0x00, 0x01, 0x01,
				 0x00, 0x02, 0x00, 0x03, 0x01, 0x01, 0x06,
				 0x00, 0x80, 0x00};
const __u8 nci_rf_disc_map_rsp[] = {0x41, 0x00, 0x01, 0x00};
const __u8 nci_rf_disc_rsp[] = {0x41, 0x03, 0x01, 0x00};
const __u8 nci_rf_deact_rsp[] = {0x41, 0x06, 0x01, 0x00};

struct msgtemplate {
	struct nlmsghdr n;
	struct genlmsghdr g;
	char buf[MAX_MSG_SIZE];
};

static int create_nl_socket(void)
{
	int fd;
	struct sockaddr_nl local;

	fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
	if (fd < 0)
		return -1;

	memset(&local, 0, sizeof(local));
	local.nl_family = AF_NETLINK;

	if (bind(fd, (struct sockaddr *)&local, sizeof(local)) < 0)
		goto error;

	return fd;
error:
	close(fd);
	return -1;
}

static int send_cmd_mt_nla(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
			   __u8 genl_cmd, int nla_num, __u16 nla_type[],
			   void *nla_data[], int nla_len[])
{
	struct sockaddr_nl nladdr;
	struct msgtemplate msg;
	struct nlattr *na;
	int cnt, prv_len;
	int r, buflen;
	char *buf;

	msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
	msg.n.nlmsg_type = nlmsg_type;
	msg.n.nlmsg_flags = NLM_F_REQUEST;
	msg.n.nlmsg_seq = 0;
	msg.n.nlmsg_pid = nlmsg_pid;
	msg.g.cmd = genl_cmd;
	msg.g.version = 0x1;

	prv_len = 0;
	for (cnt = 0; cnt < nla_num; cnt++) {
		na = (struct nlattr *)(GENLMSG_DATA(&msg) + prv_len);
		na->nla_type = nla_type[cnt];
		na->nla_len = nla_len[cnt] + NLA_HDRLEN;

		if (nla_len > 0)
			memcpy(NLA_DATA(na), nla_data[cnt], nla_len[cnt]);

		msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
		prv_len = na->nla_len;
	}

	buf = (char *)&msg;
	buflen = msg.n.nlmsg_len;
	memset(&nladdr, 0, sizeof(nladdr));
	nladdr.nl_family = AF_NETLINK;

	while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *)&nladdr,
			   sizeof(nladdr))) < buflen) {
		if (r > 0) {
			buf += r;
			buflen -= r;
		} else if (errno != EAGAIN) {
			return -1;
		}
	}
	return 0;
}

static int send_get_nfc_family(int sd, __u32 pid)
{
	__u16 nla_get_family_type = CTRL_ATTR_FAMILY_NAME;
	void *nla_get_family_data;
	int nla_get_family_len;
	char family_name[100];

	nla_get_family_len = strlen(NFC_GENL_NAME) + 1;
	strcpy(family_name, NFC_GENL_NAME);
	nla_get_family_data = family_name;

	return send_cmd_mt_nla(sd, GENL_ID_CTRL, pid, CTRL_CMD_GETFAMILY,
				1, &nla_get_family_type,
				&nla_get_family_data, &nla_get_family_len);
}

static int get_family_id(int sd, __u32 pid)
{
	struct {
		struct nlmsghdr n;
		struct genlmsghdr g;
		char buf[512];
	} ans;
	struct nlattr *na;
	int rep_len;
	__u16 id;
	int rc;

	rc = send_get_nfc_family(sd, pid);

	if (rc < 0)
		return 0;

	rep_len = recv(sd, &ans, sizeof(ans), 0);

	if (ans.n.nlmsg_type == NLMSG_ERROR || rep_len < 0 ||
	    !NLMSG_OK(&ans.n, rep_len))
		return 0;

	na = (struct nlattr *)GENLMSG_DATA(&ans);
	na = (struct nlattr *)((char *)na + NLA_ALIGN(na->nla_len));
	if (na->nla_type == CTRL_ATTR_FAMILY_ID)
		id = *(__u16 *)NLA_DATA(na);

	return id;
}

static int send_cmd_with_idx(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
			     __u8 genl_cmd, int dev_id)
{
	__u16 nla_type = NFC_ATTR_DEVICE_INDEX;
	void *nla_data = &dev_id;
	int nla_len = 4;

	return send_cmd_mt_nla(sd, nlmsg_type, nlmsg_pid, genl_cmd, 1,
				&nla_type, &nla_data, &nla_len);
}

static int get_nci_devid(int sd, __u16 fid, __u32 pid, int dev_id, struct msgtemplate *msg)
{
	int rc, rep_len;

	rc = send_cmd_with_idx(sd, fid, pid, NFC_CMD_GET_DEVICE, dev_id);
	if (rc < 0) {
		rc = -1;
		goto error;
	}

	rep_len = recv(sd, msg, sizeof(*msg), 0);
	if (rep_len < 0) {
		rc = -2;
		goto error;
	}

	if (msg->n.nlmsg_type == NLMSG_ERROR ||
	    !NLMSG_OK(&msg->n, rep_len)) {
		rc = -3;
		goto error;
	}

	return 0;
error:
	return rc;
}

static __u8 get_dev_enable_state(struct msgtemplate *msg)
{
	struct nlattr *na;
	int rep_len;
	int len;

	rep_len = GENLMSG_PAYLOAD(&msg->n);
	na = (struct nlattr *)GENLMSG_DATA(msg);
	len = 0;

	while (len < rep_len) {
		len += NLA_ALIGN(na->nla_len);
		if (na->nla_type == NFC_ATTR_DEVICE_POWERED)
			return *(char *)NLA_DATA(na);
		na = (struct nlattr *)(GENLMSG_DATA(msg) + len);
	}

	return rep_len;
}

FIXTURE(NCI) {
	int virtual_nci_fd;
	bool open_state;
	int dev_idex;
	bool isNCI2;
	int proto;
	__u32 pid;
	__u16 fid;
	int sd;
};

FIXTURE_VARIANT(NCI) {
	bool isNCI2;
};

FIXTURE_VARIANT_ADD(NCI, NCI1_0) {
	.isNCI2 = false,
};

FIXTURE_VARIANT_ADD(NCI, NCI2_0) {
	.isNCI2 = true,
};

static void *virtual_dev_open(void *data)
{
	char buf[258];
	int dev_fd;
	int len;

	dev_fd = *(int *)data;

	while ((len = read(dev_fd, buf, 258)) == 0)
		;
	if (len <= 0)
		goto error;
	if (len != sizeof(nci_reset_cmd))
		goto error;
	if (memcmp(nci_reset_cmd, buf, len))
		goto error;
	write(dev_fd, nci_reset_rsp, sizeof(nci_reset_rsp));

	while ((len = read(dev_fd, buf, 258)) == 0)
		;
	if (len <= 0)
		goto error;
	if (len != sizeof(nci_init_cmd))
		goto error;
	if (memcmp(nci_init_cmd, buf, len))
		goto error;
	write(dev_fd, nci_init_rsp, sizeof(nci_init_rsp));

	while ((len = read(dev_fd, buf, 258)) == 0)
		;
	if (len <= 0)
		goto error;
	if (len != sizeof(nci_rf_disc_map_cmd))
		goto error;
	if (memcmp(nci_rf_disc_map_cmd, buf, len))
		goto error;
	write(dev_fd, nci_rf_disc_map_rsp, sizeof(nci_rf_disc_map_rsp));

	return (void *)0;
error:
	return (void *)-1;
}

static void *virtual_dev_open_v2(void *data)
{
	char buf[258];
	int dev_fd;
	int len;

	dev_fd = *(int *)data;

	while ((len = read(dev_fd, buf, 258)) == 0)
		;
	if (len <= 0)
		goto error;
	if (len != sizeof(nci_reset_cmd))
		goto error;
	if (memcmp(nci_reset_cmd, buf, len))
		goto error;
	write(dev_fd, nci_reset_rsp_v2, sizeof(nci_reset_rsp_v2));
	write(dev_fd, nci_reset_ntf, sizeof(nci_reset_ntf));

	while ((len = read(dev_fd, buf, 258)) == 0)
		;
	if (len <= 0)
		goto error;
	if (len != sizeof(nci_init_cmd_v2))
		goto error;
	if (memcmp(nci_init_cmd_v2, buf, len))
		goto error;
	write(dev_fd, nci_init_rsp_v2, sizeof(nci_init_rsp_v2));

	while ((len = read(dev_fd, buf, 258)) == 0)
		;
	if (len <= 0)
		goto error;
	if (len != sizeof(nci_rf_disc_map_cmd))
		goto error;
	if (memcmp(nci_rf_disc_map_cmd, buf, len))
		goto error;
	write(dev_fd, nci_rf_disc_map_rsp, sizeof(nci_rf_disc_map_rsp));

	return (void *)0;
error:
	return (void *)-1;
}

FIXTURE_SETUP(NCI)
{
	struct msgtemplate msg;
	pthread_t thread_t;
	int status;
	int rc;

	self->open_state = false;
	self->proto = VIRTUAL_NFC_PROTOCOLS;
	self->isNCI2 = variant->isNCI2;

	self->sd = create_nl_socket();
	ASSERT_NE(self->sd, -1);

	self->pid = getpid();
	self->fid = get_family_id(self->sd, self->pid);
	ASSERT_NE(self->fid, -1);

	self->virtual_nci_fd = open("/dev/virtual_nci", O_RDWR);
	ASSERT_GT(self->virtual_nci_fd, -1);

	rc = ioctl(self->virtual_nci_fd, IOCTL_GET_NCIDEV_IDX, &self->dev_idex);
	ASSERT_EQ(rc, 0);

	rc = get_nci_devid(self->sd, self->fid, self->pid, self->dev_idex, &msg);
	ASSERT_EQ(rc, 0);
	EXPECT_EQ(get_dev_enable_state(&msg), 0);

	if (self->isNCI2)
		rc = pthread_create(&thread_t, NULL, virtual_dev_open_v2,
				    (void *)&self->virtual_nci_fd);
	else
		rc = pthread_create(&thread_t, NULL, virtual_dev_open,
				    (void *)&self->virtual_nci_fd);
	ASSERT_GT(rc, -1);

	rc = send_cmd_with_idx(self->sd, self->fid, self->pid,
			       NFC_CMD_DEV_UP, self->dev_idex);
	EXPECT_EQ(rc, 0);

	pthread_join(thread_t, (void **)&status);
	ASSERT_EQ(status, 0);
	self->open_state = true;
}

static void *virtual_deinit(void *data)
{
	char buf[258];
	int dev_fd;
	int len;

	dev_fd = *(int *)data;

	while ((len = read(dev_fd, buf, 258)) == 0)
		;
	if (len <= 0)
		goto error;
	if (len != sizeof(nci_reset_cmd))
		goto error;
	if (memcmp(nci_reset_cmd, buf, len))
		goto error;
	write(dev_fd, nci_reset_rsp, sizeof(nci_reset_rsp));

	return (void *)0;
error:
	return (void *)-1;
}

static void *virtual_deinit_v2(void *data)
{
	char buf[258];
	int dev_fd;
	int len;

	dev_fd = *(int *)data;

	while ((len = read(dev_fd, buf, 258)) == 0)
		;
	if (len <= 0)
		goto error;
	if (len != sizeof(nci_reset_cmd))
		goto error;
	if (memcmp(nci_reset_cmd, buf, len))
		goto error;
	write(dev_fd, nci_reset_rsp_v2, sizeof(nci_reset_rsp_v2));
	write(dev_fd, nci_reset_ntf, sizeof(nci_reset_ntf));

	return (void *)0;
error:
	return (void *)-1;
}

FIXTURE_TEARDOWN(NCI)
{
	pthread_t thread_t;
	int status;
	int rc;

	if (self->open_state) {
		if (self->isNCI2)
			rc = pthread_create(&thread_t, NULL,
					    virtual_deinit_v2,
					    (void *)&self->virtual_nci_fd);
		else
			rc = pthread_create(&thread_t, NULL, virtual_deinit,
					    (void *)&self->virtual_nci_fd);

		ASSERT_GT(rc, -1);
		rc = send_cmd_with_idx(self->sd, self->fid, self->pid,
				       NFC_CMD_DEV_DOWN, self->dev_idex);
		EXPECT_EQ(rc, 0);

		pthread_join(thread_t, (void **)&status);
		ASSERT_EQ(status, 0);
	}

	close(self->sd);
	close(self->virtual_nci_fd);
	self->open_state = false;
}

TEST_F(NCI, init)
{
	struct msgtemplate msg;
	int rc;

	rc = get_nci_devid(self->sd, self->fid, self->pid, self->dev_idex,
			   &msg);
	ASSERT_EQ(rc, 0);
	EXPECT_EQ(get_dev_enable_state(&msg), 1);
}

static void *virtual_poll_start(void *data)
{
	char buf[258];
	int dev_fd;
	int len;

	dev_fd = *(int *)data;

	while ((len = read(dev_fd, buf, 258)) == 0)
		;
	if (len <= 0)
		goto error;
	if (len != sizeof(nci_rf_discovery_cmd))
		goto error;
	if (memcmp(nci_rf_discovery_cmd, buf, len))
		goto error;
	write(dev_fd, nci_rf_disc_rsp, sizeof(nci_rf_disc_rsp))
		;

	return (void *)0;
error:
	return (void *)-1;
}

static void *virtual_poll_stop(void *data)
{
	char buf[258];
	int dev_fd;
	int len;

	dev_fd = *(int *)data;

	while ((len = read(dev_fd, buf, 258)) == 0)
		;
	if (len <= 0)
		goto error;
	if (len != sizeof(nci_rf_deact_cmd))
		goto error;
	if (memcmp(nci_rf_deact_cmd, buf, len))
		goto error;
	write(dev_fd, nci_rf_deact_rsp, sizeof(nci_rf_deact_rsp));

	return (void *)0;
error:
	return (void *)-1;
}

TEST_F(NCI, start_poll)
{
	__u16 nla_start_poll_type[2] = {NFC_ATTR_DEVICE_INDEX,
					 NFC_ATTR_PROTOCOLS};
	void *nla_start_poll_data[2] = {&self->dev_idex, &self->proto};
	int nla_start_poll_len[2] = {4, 4};
	pthread_t thread_t;
	int status;
	int rc;

	rc = pthread_create(&thread_t, NULL, virtual_poll_start,
			    (void *)&self->virtual_nci_fd);
	ASSERT_GT(rc, -1);

	rc = send_cmd_mt_nla(self->sd, self->fid, self->pid,
			     NFC_CMD_START_POLL, 2, nla_start_poll_type,
			     nla_start_poll_data, nla_start_poll_len);
	EXPECT_EQ(rc, 0);

	pthread_join(thread_t, (void **)&status);
	ASSERT_EQ(status, 0);

	rc = pthread_create(&thread_t, NULL, virtual_poll_stop,
			    (void *)&self->virtual_nci_fd);
	ASSERT_GT(rc, -1);

	rc = send_cmd_with_idx(self->sd, self->fid, self->pid,
			       NFC_CMD_STOP_POLL, self->dev_idex);
	EXPECT_EQ(rc, 0);

	pthread_join(thread_t, (void **)&status);
	ASSERT_EQ(status, 0);
}

TEST_F(NCI, deinit)
{
	struct msgtemplate msg;
	pthread_t thread_t;
	int status;
	int rc;

	rc = get_nci_devid(self->sd, self->fid, self->pid, self->dev_idex,
			   &msg);
	ASSERT_EQ(rc, 0);
	EXPECT_EQ(get_dev_enable_state(&msg), 1);

	if (self->isNCI2)
		rc = pthread_create(&thread_t, NULL, virtual_deinit_v2,
				    (void *)&self->virtual_nci_fd);
	else
		rc = pthread_create(&thread_t, NULL, virtual_deinit,
				    (void *)&self->virtual_nci_fd);
	ASSERT_GT(rc, -1);

	rc = send_cmd_with_idx(self->sd, self->fid, self->pid,
			       NFC_CMD_DEV_DOWN, self->dev_idex);
	EXPECT_EQ(rc, 0);

	pthread_join(thread_t, (void **)&status);
	self->open_state = 0;
	ASSERT_EQ(status, 0);

	rc = get_nci_devid(self->sd, self->fid, self->pid, self->dev_idex,
			   &msg);
	ASSERT_EQ(rc, 0);
	EXPECT_EQ(get_dev_enable_state(&msg), 0);
}

TEST_HARNESS_MAIN