rmnetctl/src/librmnetctl.c

/******************************************************************************

			L I B R M N E T C T L . C

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******************************************************************************/

/*!
* @file    librmnetctl.c
* @brief   rmnet control API's implementation file
*/

/*===========================================================================
			INCLUDE FILES
===========================================================================*/

#include <sys/socket.h>
#include <stdint.h>
#include <linux/netlink.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <linux/rtnetlink.h>
#include <linux/gen_stats.h>
#include <net/if.h>
#include <asm/types.h>
#include <linux/rmnet_data.h>
#include "librmnetctl_hndl.h"
#include "librmnetctl.h"

#ifdef USE_GLIB
#include <glib.h>
#define strlcpy g_strlcpy
#endif

#define RMNETCTL_SOCK_FLAG 0
#define ROOT_USER_ID 0
#define MIN_VALID_PROCESS_ID 0
#define MIN_VALID_SOCKET_FD 0
#define KERNEL_PROCESS_ID 0
#define UNICAST 0
#define MAX_BUF_SIZE sizeof(struct nlmsghdr) + sizeof(struct rmnet_nl_msg_s)
#define INGRESS_FLAGS_MASK   (RMNET_INGRESS_FIX_ETHERNET | \
			      RMNET_INGRESS_FORMAT_MAP | \
			      RMNET_INGRESS_FORMAT_DEAGGREGATION | \
			      RMNET_INGRESS_FORMAT_DEMUXING | \
			      RMNET_INGRESS_FORMAT_MAP_COMMANDS | \
			      RMNET_INGRESS_FORMAT_MAP_CKSUMV3 | \
			      RMNET_INGRESS_FORMAT_MAP_CKSUMV4)
#define EGRESS_FLAGS_MASK    (RMNET_EGRESS_FORMAT__RESERVED__ | \
			      RMNET_EGRESS_FORMAT_MAP | \
			      RMNET_EGRESS_FORMAT_AGGREGATION | \
			      RMNET_EGRESS_FORMAT_MUXING | \
			      RMNET_EGRESS_FORMAT_MAP_CKSUMV3 | \
			      RMNET_EGRESS_FORMAT_MAP_CKSUMV4)

#define min(a, b) (((a) < (b)) ? (a) : (b))
#define NLMSG_TAIL(nmsg) \
    ((struct rtattr *) (((char *)(nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))

#define NLMSG_DATA_SIZE  500

#define CHECK_MEMSCPY(x) ({if (x < 0 ){return RMNETCTL_LIB_ERR;}})

struct nlmsg {
	struct nlmsghdr nl_addr;
	struct ifinfomsg ifmsg;
	char data[NLMSG_DATA_SIZE];
};

struct rmnetctl_uplink_params {
	uint16_t byte_count;
	uint8_t packet_count;
	uint8_t features;
	uint32_t time_limit;
};

/* IFLA Attributes for the RT RmNet driver */
enum {
	RMNETCTL_IFLA_UNSPEC,
	RMNETCTL_IFLA_MUX_ID,
	RMNETCTL_IFLA_FLAGS,
	RMNETCTL_IFLA_DFC_QOS,
	RMNETCTL_IFLA_UPLINK_PARAMS,
	__RMNETCTL_IFLA_MAX,
};

/* Flow message types sent to DFC driver */
enum {
	/* Activate flow */
	RMNET_FLOW_MSG_ACTIVATE = 1,
	/* Delete flow */
	RMNET_FLOW_MSG_DEACTIVATE = 2,
	/* Legacy flow control */
	RMNET_FLOW_MSG_CONTROL = 3,
	/* Flow up */
	RMNET_FLOW_MSG_UP = 4,
	/* Flow down */
	RMNET_FLOW_MSG_DOWN = 5,
	/* Change ACK scaling */
	RMNET_FLOW_MSG_QMI_SCALE = 6,
	/* Change powersave workqueue polling freq */
	RMNET_FLOW_MSG_WDA_FREQ = 7,
};

/* 0 reserved, 1-15 for data, 16-30 for acks */
#define RMNETCTL_NUM_TX_QUEUES 31

/* This needs to be hardcoded here because some legacy linux systems
 * do not have this definition
 */
#define RMNET_IFLA_NUM_TX_QUEUES 31

/*===========================================================================
			LOCAL FUNCTION DEFINITIONS
===========================================================================*/
/* Helper functions
 * @brief helper function to implement a secure memcpy
 * @details take source and destination buffer size into
 *          considerations before copying
 * @param dst destination buffer
 * @param dst_size size of destination buffer
 * @param src source buffer
 * @param src_size size of source buffer
 * @return size of the smallest of two buffer
 */

static inline size_t memscpy(void *dst, size_t dst_size, const void *src,
			     size_t src_size) {
	size_t min_size = dst_size < src_size ? dst_size : src_size;
	memcpy(dst, src, min_size);
	return min_size;
}

/*
* @brief helper function to implement a secure memcpy
 * for a concatenating buffer where offset is kept
 * track of
 * @details take source and destination buffer size into
 *          considerations before copying
 * @param dst destination buffer
 * @param dst_size pointer used to decrement
 * @param src source buffer
 * @param src_size size of source buffer
 * @return size of the remaining buffer
 */


static inline int  memscpy_repeat(void* dst, size_t *dst_size,
	const void* src, size_t src_size)
{
	if( !dst_size || *dst_size <= src_size || !dst || !src)
		return RMNETCTL_LIB_ERR;
	else {
		*dst_size -= memscpy(dst, *dst_size, src, src_size);
	}
	return *dst_size;
}


/*!
* @brief Synchronous method to send and receive messages to and from the kernel
* using  netlink sockets
* @details Increments the transaction id for each message sent to the kernel.
* Sends the netlink message to the kernel and receives the response from the
* kernel.
* @param *hndl RmNet handle for this transaction
* @param request Message to be sent to the kernel
* @param response Message received from the kernel
* @return RMNETCTL_API_SUCCESS if successfully able to send and receive message
* from the kernel
* @return RMNETCTL_API_ERR_HNDL_INVALID if RmNet handle for the transaction was
* NULL
* @return RMNETCTL_API_ERR_REQUEST_NULL not enough memory to create buffer for
* sending the message
* @return RMNETCTL_API_ERR_MESSAGE_SEND if could not send the message to kernel
* @return RMNETCTL_API_ERR_MESSAGE_RECEIVE if could not receive message from the
* kernel
* @return RMNETCTL_API_ERR_MESSAGE_TYPE if the request and response type do not
* match
*/
static uint16_t rmnetctl_transact(rmnetctl_hndl_t *hndl,
			struct rmnet_nl_msg_s *request,
			struct rmnet_nl_msg_s *response) {
	uint8_t *request_buf, *response_buf;
	struct nlmsghdr *nlmsghdr_val;
	struct rmnet_nl_msg_s *rmnet_nl_msg_s_val;
	ssize_t bytes_read = -1, buffsize = MAX_BUF_SIZE - sizeof(struct nlmsghdr);
	uint16_t return_code = RMNETCTL_API_ERR_HNDL_INVALID;
	struct sockaddr_nl* __attribute__((__may_alias__)) saddr_ptr;
	request_buf = NULL;
	response_buf = NULL;
	nlmsghdr_val = NULL;
	rmnet_nl_msg_s_val = NULL;
	do {
	if (!hndl){
		break;
	}
	if (!request){
		return_code = RMNETCTL_API_ERR_REQUEST_NULL;
		break;
	}
	if (!response){
		return_code = RMNETCTL_API_ERR_RESPONSE_NULL;
		break;
	}
	request_buf = (uint8_t *)malloc(MAX_BUF_SIZE * sizeof(uint8_t));
	if (!request_buf){
		return_code = RMNETCTL_API_ERR_REQUEST_NULL;
		break;
	}

	response_buf = (uint8_t *)malloc(MAX_BUF_SIZE * sizeof(uint8_t));
	if (!response_buf) {
		return_code = RMNETCTL_API_ERR_RESPONSE_NULL;
		break;
	}

	nlmsghdr_val = (struct nlmsghdr *)request_buf;
	rmnet_nl_msg_s_val = (struct rmnet_nl_msg_s *)NLMSG_DATA(request_buf);

	memset(request_buf, 0, MAX_BUF_SIZE*sizeof(uint8_t));
	memset(response_buf, 0, MAX_BUF_SIZE*sizeof(uint8_t));

	nlmsghdr_val->nlmsg_seq = hndl->transaction_id;
	nlmsghdr_val->nlmsg_pid = hndl->pid;
	nlmsghdr_val->nlmsg_len = MAX_BUF_SIZE;

	memscpy((void *)NLMSG_DATA(request_buf), buffsize, request,
	sizeof(struct rmnet_nl_msg_s));

	rmnet_nl_msg_s_val->crd = RMNET_NETLINK_MSG_COMMAND;
	hndl->transaction_id++;

	saddr_ptr = &hndl->dest_addr;
	socklen_t addrlen = sizeof(struct sockaddr_nl);
	if (sendto(hndl->netlink_fd,
			request_buf,
			MAX_BUF_SIZE,
			RMNETCTL_SOCK_FLAG,
			(struct sockaddr*)saddr_ptr,
			sizeof(struct sockaddr_nl)) < 0) {
		return_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		break;
	}

	saddr_ptr = &hndl->src_addr;
	bytes_read = recvfrom(hndl->netlink_fd,
			response_buf,
			MAX_BUF_SIZE,
			RMNETCTL_SOCK_FLAG,
			(struct sockaddr*)saddr_ptr,
			&addrlen);
	if (bytes_read < 0) {
		return_code = RMNETCTL_API_ERR_MESSAGE_RECEIVE;
		break;
	}
	buffsize = MAX_BUF_SIZE - sizeof(struct nlmsghdr);
	memscpy(response, buffsize, (void *)NLMSG_DATA(response_buf),
	sizeof(struct rmnet_nl_msg_s));
	if (sizeof(*response) < sizeof(struct rmnet_nl_msg_s)) {
		return_code = RMNETCTL_API_ERR_RESPONSE_NULL;
		break;
	}

	if (request->message_type != response->message_type) {
		return_code = RMNETCTL_API_ERR_MESSAGE_TYPE;
		break;
	}
	return_code = RMNETCTL_SUCCESS;
	} while(0);
	free(request_buf);
	free(response_buf);
	return return_code;
}

/*!
* @brief Static function to check the dev name
* @details Checks if the name is not NULL and if the name is less than the
* RMNET_MAX_STR_LEN
* @param dev_name Name of the device
* @return RMNETCTL_SUCCESS if successful
* @return RMNETCTL_INVALID_ARG if invalid arguments were passed to the API
*/
static inline int _rmnetctl_check_dev_name(const char *dev_name) {
	int return_code = RMNETCTL_INVALID_ARG;
	do {
	if (!dev_name)
		break;
	if (strlen(dev_name) >= RMNET_MAX_STR_LEN)
		break;
	return_code = RMNETCTL_SUCCESS;
	} while(0);
	return return_code;
}

/*!
* @brief Static function to check the string length after a copy
* @details Checks if the string length is not lesser than zero and lesser than
* RMNET_MAX_STR_LEN
* @param str_len length of the string after a copy
* @param error_code Status code of this operation
* @return RMNETCTL_SUCCESS if successful
* @return RMNETCTL_LIB_ERR if there was a library error. Check error_code
*/
static inline int _rmnetctl_check_len(size_t str_len, uint16_t *error_code) {
	int return_code = RMNETCTL_LIB_ERR;
	do {
	if (str_len > RMNET_MAX_STR_LEN) {
		*error_code = RMNETCTL_API_ERR_STRING_TRUNCATION;
		break;
	}
	return_code = RMNETCTL_SUCCESS;
	} while(0);
	return return_code;
}

/*!
* @brief Static function to check the response type
* @details Checks if the response type of this message was return code
* @param crd The crd field passed
* @param error_code Status code of this operation
* @return RMNETCTL_SUCCESS if successful
* @return RMNETCTL_LIB_ERR if there was a library error. Check error_code
*/
static inline int _rmnetctl_check_code(int crd, uint16_t *error_code) {
	int return_code = RMNETCTL_LIB_ERR;
	do {
	if (crd != RMNET_NETLINK_MSG_RETURNCODE) {
		*error_code = RMNETCTL_API_ERR_RETURN_TYPE;
		break;
	}
	return_code = RMNETCTL_SUCCESS;
	} while(0);
	return return_code;
}

/*!
* @brief Static function to check the response type
* @details Checks if the response type of this message was data
* @param crd The crd field passed
* @param error_code Status code of this operation
* @return RMNETCTL_SUCCESS if successful
* @return RMNETCTL_LIB_ERR if there was a library error. Check error_code
*/
static inline int _rmnetctl_check_data(int crd, uint16_t *error_code) {
	int return_code = RMNETCTL_LIB_ERR;
	do {
	if (crd != RMNET_NETLINK_MSG_RETURNDATA) {
		*error_code = RMNETCTL_API_ERR_RETURN_TYPE;
		break;
	}
	return_code = RMNETCTL_SUCCESS;
	} while(0);
	return return_code;
}

/*!
* @brief Static function to set the return value
* @details Checks if the error_code from the transaction is zero for a return
* code type message and sets the message type as RMNETCTL_SUCCESS
* @param crd The crd field passed
* @param error_code Status code of this operation
* @return RMNETCTL_SUCCESS if successful
* @return RMNETCTL_KERNEL_ERR if there was an error in the kernel.
* Check error_code
*/
static inline int _rmnetctl_set_codes(int error_val, uint16_t *error_code) {
	int return_code = RMNETCTL_KERNEL_ERR;
	if (error_val == RMNET_CONFIG_OK)
		return_code = RMNETCTL_SUCCESS;
	else
		*error_code = (uint16_t)error_val + RMNETCTL_KERNEL_FIRST_ERR;
	return return_code;
}

/*===========================================================================
				EXPOSED API
===========================================================================*/

int rmnetctl_init(rmnetctl_hndl_t **hndl, uint16_t *error_code)
{
	pid_t pid = 0;
	int netlink_fd = -1, return_code = RMNETCTL_LIB_ERR;
	struct sockaddr_nl* __attribute__((__may_alias__)) saddr_ptr;
	do {
	if ((!hndl) || (!error_code)){
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	*hndl = (rmnetctl_hndl_t *)malloc(sizeof(rmnetctl_hndl_t));
	if (!*hndl) {
		*error_code = RMNETCTL_API_ERR_HNDL_INVALID;
		break;
	}

	memset(*hndl, 0, sizeof(rmnetctl_hndl_t));

	pid = getpid();
	if (pid  < MIN_VALID_PROCESS_ID) {
		free(*hndl);
		*error_code = RMNETCTL_INIT_ERR_PROCESS_ID;
		break;
	}
	(*hndl)->pid = (uint32_t)pid;
	netlink_fd = socket(PF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, RMNET_NETLINK_PROTO);
	if (netlink_fd < MIN_VALID_SOCKET_FD) {
		free(*hndl);
		*error_code = RMNETCTL_INIT_ERR_NETLINK_FD;
		break;
	}

	(*hndl)->netlink_fd = netlink_fd;

	memset(&(*hndl)->src_addr, 0, sizeof(struct sockaddr_nl));

	(*hndl)->src_addr.nl_family = AF_NETLINK;
	(*hndl)->src_addr.nl_pid = (*hndl)->pid;

	saddr_ptr = &(*hndl)->src_addr;
	if (bind((*hndl)->netlink_fd,
		(struct sockaddr*)saddr_ptr,
		sizeof(struct sockaddr_nl)) < 0) {
		close((*hndl)->netlink_fd);
		free(*hndl);
		*error_code = RMNETCTL_INIT_ERR_BIND;
		break;
	}

	memset(&(*hndl)->dest_addr, 0, sizeof(struct sockaddr_nl));

	(*hndl)->dest_addr.nl_family = AF_NETLINK;
	(*hndl)->dest_addr.nl_pid = KERNEL_PROCESS_ID;
	(*hndl)->dest_addr.nl_groups = UNICAST;

	return_code = RMNETCTL_SUCCESS;
	} while(0);
	return return_code;
}

void rmnetctl_cleanup(rmnetctl_hndl_t *hndl)
{
	if (!hndl)
		return;
	close(hndl->netlink_fd);
	free(hndl);
}

int rmnet_associate_network_device(rmnetctl_hndl_t *hndl,
				   const char *dev_name,
				   uint16_t *error_code,
				   uint8_t assoc_dev)
{
	struct rmnet_nl_msg_s request, response;
	size_t str_len = 0;
	int return_code = RMNETCTL_LIB_ERR;
	do {
	if ((!hndl) || (!error_code) || _rmnetctl_check_dev_name(dev_name) ||
		((assoc_dev != RMNETCTL_DEVICE_ASSOCIATE) &&
		(assoc_dev != RMNETCTL_DEVICE_UNASSOCIATE))) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	if (assoc_dev == RMNETCTL_DEVICE_ASSOCIATE)
		request.message_type = RMNET_NETLINK_ASSOCIATE_NETWORK_DEVICE;
	else
		request.message_type = RMNET_NETLINK_UNASSOCIATE_NETWORK_DEVICE;

	request.arg_length = RMNET_MAX_STR_LEN;
	str_len = strlcpy((char *)(request.data), dev_name, (size_t)RMNET_MAX_STR_LEN);
	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;
	if (_rmnetctl_check_code(response.crd, error_code) != RMNETCTL_SUCCESS)
		break;
	return_code = _rmnetctl_set_codes(response.return_code, error_code);
	} while(0);
	return return_code;
}

int rmnet_get_network_device_associated(rmnetctl_hndl_t *hndl,
					const char *dev_name,
					int *register_status,
					uint16_t *error_code) {
	struct rmnet_nl_msg_s request, response;
	size_t str_len = 0;
	int  return_code = RMNETCTL_LIB_ERR;
	do {
	if ((!hndl) || (!register_status) || (!error_code) ||
	_rmnetctl_check_dev_name(dev_name)) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	request.message_type = RMNET_NETLINK_GET_NETWORK_DEVICE_ASSOCIATED;

	request.arg_length = RMNET_MAX_STR_LEN;
	str_len = strlcpy((char *)(request.data), dev_name, RMNET_MAX_STR_LEN);
	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;

	if (_rmnetctl_check_data(response.crd, error_code)
		!= RMNETCTL_SUCCESS) {
		if (_rmnetctl_check_code(response.crd, error_code)
			== RMNETCTL_SUCCESS)
			return_code = _rmnetctl_set_codes(response.return_code,
							  error_code);
		break;
	}

	*register_status = response.return_code;
	return_code = RMNETCTL_SUCCESS;
	} while(0);
	return return_code;
}

int rmnet_set_link_egress_data_format(rmnetctl_hndl_t *hndl,
				      uint32_t egress_flags,
				      uint16_t agg_size,
				      uint16_t agg_count,
				      const char *dev_name,
				      uint16_t *error_code) {
	struct rmnet_nl_msg_s request, response;
	size_t str_len = 0;
	int  return_code = RMNETCTL_LIB_ERR;
	do {
	if ((!hndl) || (!error_code) || _rmnetctl_check_dev_name(dev_name) ||
	    ((~EGRESS_FLAGS_MASK) & egress_flags)) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	request.message_type = RMNET_NETLINK_SET_LINK_EGRESS_DATA_FORMAT;

	request.arg_length = RMNET_MAX_STR_LEN +
			 sizeof(uint32_t) + sizeof(uint16_t) + sizeof(uint16_t);
	str_len = strlcpy((char *)(request.data_format.dev),
			  dev_name,
			  RMNET_MAX_STR_LEN);
	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;

	request.data_format.flags = egress_flags;
	request.data_format.agg_size = agg_size;
	request.data_format.agg_count = agg_count;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;

	if (_rmnetctl_check_code(response.crd, error_code) != RMNETCTL_SUCCESS)
		break;

	return_code = _rmnetctl_set_codes(response.return_code, error_code);
	} while(0);
	return return_code;
}

int rmnet_get_link_egress_data_format(rmnetctl_hndl_t *hndl,
				      const char *dev_name,
				      uint32_t *egress_flags,
				      uint16_t *agg_size,
				      uint16_t *agg_count,
				      uint16_t *error_code) {
	struct rmnet_nl_msg_s request, response;
	size_t str_len = 0;
	int  return_code = RMNETCTL_LIB_ERR;
	do {
	if ((!hndl) || (!egress_flags) || (!agg_size) || (!agg_count) ||
	(!error_code) || _rmnetctl_check_dev_name(dev_name)) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}
	request.message_type = RMNET_NETLINK_GET_LINK_EGRESS_DATA_FORMAT;

	request.arg_length = RMNET_MAX_STR_LEN;
	str_len = strlcpy((char *)(request.data_format.dev),
			  dev_name,
			  RMNET_MAX_STR_LEN);
	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;

	if (_rmnetctl_check_data(response.crd, error_code)
		!= RMNETCTL_SUCCESS) {
		if (_rmnetctl_check_code(response.crd, error_code)
			== RMNETCTL_SUCCESS)
			return_code = _rmnetctl_set_codes(response.return_code,
							  error_code);
		break;
	}

	*egress_flags = response.data_format.flags;
	*agg_size = response.data_format.agg_size;
	*agg_count = response.data_format.agg_count;
	return_code = RMNETCTL_SUCCESS;
	} while(0);
	return return_code;
}

int rmnet_set_link_ingress_data_format_tailspace(rmnetctl_hndl_t *hndl,
						 uint32_t ingress_flags,
						 uint8_t  tail_spacing,
						 const char *dev_name,
						 uint16_t *error_code) {
	struct rmnet_nl_msg_s request, response;
	size_t str_len = 0;
	int  return_code = RMNETCTL_LIB_ERR;
	do {
	if ((!hndl) || (!error_code) || _rmnetctl_check_dev_name(dev_name) ||
	    ((~INGRESS_FLAGS_MASK) & ingress_flags)) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	request.message_type = RMNET_NETLINK_SET_LINK_INGRESS_DATA_FORMAT;

	request.arg_length = RMNET_MAX_STR_LEN +
	sizeof(uint32_t) + sizeof(uint16_t) + sizeof(uint16_t);
	str_len = strlcpy((char *)(request.data_format.dev),
			  dev_name,
			  RMNET_MAX_STR_LEN);
	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;
	request.data_format.flags = ingress_flags;
	request.data_format.tail_spacing = tail_spacing;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;

	if (_rmnetctl_check_code(response.crd, error_code) != RMNETCTL_SUCCESS)
		break;

	return_code = _rmnetctl_set_codes(response.return_code, error_code);
	} while(0);
	return return_code;
}

int rmnet_get_link_ingress_data_format_tailspace(rmnetctl_hndl_t *hndl,
						 const char *dev_name,
						 uint32_t *ingress_flags,
						 uint8_t  *tail_spacing,
						 uint16_t *error_code) {
	struct rmnet_nl_msg_s request, response;
	size_t str_len = 0;
	int  return_code = RMNETCTL_LIB_ERR;
	do {
	if ((!hndl) || (!error_code) ||
		_rmnetctl_check_dev_name(dev_name)) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	request.message_type = RMNET_NETLINK_GET_LINK_INGRESS_DATA_FORMAT;

	request.arg_length = RMNET_MAX_STR_LEN;
	str_len = strlcpy((char *)(request.data_format.dev),
			  dev_name,
			  RMNET_MAX_STR_LEN);
	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;

	if (_rmnetctl_check_data(response.crd, error_code)
		!= RMNETCTL_SUCCESS) {
		if (_rmnetctl_check_code(response.crd, error_code)
			== RMNETCTL_SUCCESS)
			return_code = _rmnetctl_set_codes(response.return_code,
							  error_code);
		break;
	}

	if (ingress_flags)
		*ingress_flags = response.data_format.flags;

	if (tail_spacing)
		*tail_spacing = response.data_format.tail_spacing;

	return_code = RMNETCTL_SUCCESS;
	} while(0);
	return return_code;
}

int rmnet_set_logical_ep_config(rmnetctl_hndl_t *hndl,
				int32_t ep_id,
				uint8_t operating_mode,
				const char *dev_name,
				const char *next_dev,
				uint16_t *error_code) {
	struct rmnet_nl_msg_s request, response;
	size_t str_len = 0;
	int return_code = RMNETCTL_LIB_ERR;
	do {
	if ((!hndl) || ((ep_id < -1) || (ep_id > 31)) || (!error_code) ||
		_rmnetctl_check_dev_name(dev_name) ||
		_rmnetctl_check_dev_name(next_dev) ||
		operating_mode >= RMNET_EPMODE_LENGTH) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	request.message_type = RMNET_NETLINK_SET_LOGICAL_EP_CONFIG;

	request.arg_length = RMNET_MAX_STR_LEN +
	RMNET_MAX_STR_LEN + sizeof(int32_t) + sizeof(uint8_t);
	str_len = strlcpy((char *)(request.local_ep_config.dev),
			  dev_name,
			  RMNET_MAX_STR_LEN);
	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;

	str_len = strlcpy((char *)(request.local_ep_config.next_dev),
			  next_dev,
			  RMNET_MAX_STR_LEN);
	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;
	request.local_ep_config.ep_id = ep_id;
	request.local_ep_config.operating_mode = operating_mode;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;
	if (_rmnetctl_check_code(response.crd, error_code) != RMNETCTL_SUCCESS)
		break;

	return_code = _rmnetctl_set_codes(response.return_code, error_code);
	} while(0);
	return return_code;
}

int rmnet_unset_logical_ep_config(rmnetctl_hndl_t *hndl,
				  int32_t ep_id,
				  const char *dev_name,
				  uint16_t *error_code) {
	struct rmnet_nl_msg_s request, response;
	size_t str_len = 0;
	int return_code = RMNETCTL_LIB_ERR;
	do {

	if ((!hndl) || ((ep_id < -1) || (ep_id > 31)) || (!error_code) ||
		_rmnetctl_check_dev_name(dev_name)) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	request.message_type = RMNET_NETLINK_UNSET_LOGICAL_EP_CONFIG;

	request.arg_length = RMNET_MAX_STR_LEN + sizeof(int32_t);
	str_len = strlcpy((char *)(request.local_ep_config.dev),
			  dev_name,
			  RMNET_MAX_STR_LEN);

	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;

	request.local_ep_config.ep_id = ep_id;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;
	if (_rmnetctl_check_code(response.crd, error_code) != RMNETCTL_SUCCESS)
		break;

	return_code = _rmnetctl_set_codes(response.return_code, error_code);
	} while(0);

	return return_code;
}

int rmnet_get_logical_ep_config(rmnetctl_hndl_t *hndl,
				int32_t ep_id,
				const char *dev_name,
				uint8_t *operating_mode,
				char **next_dev,
				uint32_t next_dev_len,
				uint16_t *error_code) {
	struct rmnet_nl_msg_s request, response;
	size_t str_len = 0;
	int return_code = RMNETCTL_LIB_ERR;
	do {
	if ((!hndl) || (!operating_mode) || (!error_code) || ((ep_id < -1) ||
	    (ep_id > 31)) || _rmnetctl_check_dev_name(dev_name) || (!next_dev)
	    || (0 == next_dev_len)) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	request.message_type = RMNET_NETLINK_GET_LOGICAL_EP_CONFIG;

	request.arg_length = RMNET_MAX_STR_LEN + sizeof(int32_t);
	str_len = strlcpy((char *)(request.local_ep_config.dev),
			  dev_name,
			  RMNET_MAX_STR_LEN);
	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;

	request.local_ep_config.ep_id = ep_id;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;

	if (_rmnetctl_check_data(response.crd, error_code)
		!= RMNETCTL_SUCCESS) {
		if (_rmnetctl_check_code(response.crd, error_code)
			== RMNETCTL_SUCCESS)
			return_code = _rmnetctl_set_codes(response.return_code,
							  error_code);
		break;
	}

	str_len = strlcpy(*next_dev,
			  (char *)(response.local_ep_config.next_dev),
			  min(RMNET_MAX_STR_LEN, next_dev_len));
	if (_rmnetctl_check_len(str_len, error_code) != RMNETCTL_SUCCESS)
		break;

	*operating_mode = response.local_ep_config.operating_mode;
	return_code = RMNETCTL_SUCCESS;
	} while(0);
	return return_code;
}

int rmnet_new_vnd_prefix(rmnetctl_hndl_t *hndl,
			 uint32_t id,
			 uint16_t *error_code,
			 uint8_t new_vnd,
			 const char *prefix)
{
	struct rmnet_nl_msg_s request, response;
	int return_code = RMNETCTL_LIB_ERR;
	size_t str_len = 0;
	do {
	if ((!hndl) || (!error_code) ||
	((new_vnd != RMNETCTL_NEW_VND) && (new_vnd != RMNETCTL_FREE_VND))) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	memset(request.vnd.vnd_name, 0, RMNET_MAX_STR_LEN);
	if (new_vnd ==  RMNETCTL_NEW_VND) {
		if (prefix) {
			request.message_type =RMNET_NETLINK_NEW_VND_WITH_PREFIX;
			str_len = strlcpy((char *)request.vnd.vnd_name,
					  prefix, RMNET_MAX_STR_LEN);
			if (_rmnetctl_check_len(str_len, error_code)
						!= RMNETCTL_SUCCESS)
				break;
		} else {
			request.message_type = RMNET_NETLINK_NEW_VND;
		}
	} else {
		request.message_type = RMNET_NETLINK_FREE_VND;
	}

	request.arg_length = sizeof(uint32_t);
	request.vnd.id = id;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;
	if (_rmnetctl_check_code(response.crd, error_code) != RMNETCTL_SUCCESS)
		break;

	return_code = _rmnetctl_set_codes(response.return_code, error_code);
	} while(0);
	return return_code;
}

int rmnet_new_vnd_name(rmnetctl_hndl_t *hndl,
			 uint32_t id,
			 uint16_t *error_code,
			 const char *prefix)
{
	struct rmnet_nl_msg_s request, response;
	int return_code = RMNETCTL_LIB_ERR;
	size_t str_len = 0;
	do {
	if ((!hndl) || (!error_code)) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	memset(request.vnd.vnd_name, 0, RMNET_MAX_STR_LEN);
		if (prefix) {
			request.message_type =RMNET_NETLINK_NEW_VND_WITH_NAME;
			str_len = strlcpy((char *)request.vnd.vnd_name,
					  prefix, RMNET_MAX_STR_LEN);
			if (_rmnetctl_check_len(str_len, error_code)
						!= RMNETCTL_SUCCESS)
				break;
		} else {
			request.message_type = RMNET_NETLINK_NEW_VND;
		}

	request.arg_length = sizeof(uint32_t);
	request.vnd.id = id;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;
	if (_rmnetctl_check_code(response.crd, error_code) != RMNETCTL_SUCCESS)
		break;

	return_code = _rmnetctl_set_codes(response.return_code, error_code);
	} while(0);
	return return_code;
}

int rmnet_new_vnd(rmnetctl_hndl_t *hndl,
		  uint32_t id,
		  uint16_t *error_code,
		  uint8_t new_vnd)
{
	return rmnet_new_vnd_prefix(hndl, id, error_code, new_vnd, 0);
}

int rmnet_get_vnd_name(rmnetctl_hndl_t *hndl,
		       uint32_t id,
		       uint16_t *error_code,
		       char *buf,
		       uint32_t buflen)
{
	struct rmnet_nl_msg_s request, response;
	uint32_t str_len;
	int return_code = RMNETCTL_LIB_ERR;
	do {
	if ((!hndl) || (!error_code) || (!buf) || (0 == buflen)) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}

	request.message_type = RMNET_NETLINK_GET_VND_NAME;
	request.arg_length = sizeof(uint32_t);
	request.vnd.id = id;


	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
		!= RMNETCTL_SUCCESS)
		break;

	if (_rmnetctl_check_data(response.crd, error_code)
		!= RMNETCTL_SUCCESS) {
		if (_rmnetctl_check_code(response.crd, error_code)
			== RMNETCTL_SUCCESS)
			return_code = _rmnetctl_set_codes(response.return_code,
							  error_code);
		break;
	}

	str_len = (uint32_t)strlcpy(buf,
			  (char *)(response.vnd.vnd_name),
			  buflen);
	if (str_len >= buflen) {
		*error_code = RMNETCTL_API_ERR_STRING_TRUNCATION;
		break;
	}

	return_code = RMNETCTL_SUCCESS;
	} while (0);
	return return_code;
}

int rmnet_add_del_vnd_tc_flow(rmnetctl_hndl_t *hndl,
			      uint32_t id,
			      uint32_t map_flow_id,
			      uint32_t tc_flow_id,
			      uint8_t set_flow,
			      uint16_t *error_code) {
	struct rmnet_nl_msg_s request, response;
	int return_code = RMNETCTL_LIB_ERR;
	do {
	if ((!hndl) || (!error_code) || ((set_flow != RMNETCTL_ADD_FLOW) &&
	    (set_flow != RMNETCTL_DEL_FLOW))) {
		return_code = RMNETCTL_INVALID_ARG;
		break;
	}
	if (set_flow ==  RMNETCTL_ADD_FLOW)
		request.message_type = RMNET_NETLINK_ADD_VND_TC_FLOW;
	else
		request.message_type = RMNET_NETLINK_DEL_VND_TC_FLOW;

	request.arg_length = (sizeof(uint32_t))*3;
	request.flow_control.id = id;
	request.flow_control.map_flow_id = map_flow_id;
	request.flow_control.tc_flow_id = tc_flow_id;

	if ((*error_code = rmnetctl_transact(hndl, &request, &response))
	!= RMNETCTL_SUCCESS)
		break;
	if (_rmnetctl_check_code(response.crd, error_code) != RMNETCTL_SUCCESS)
		break;
	return_code = _rmnetctl_set_codes(response.return_code, error_code);
	} while(0);
	return return_code;
}

/*
 *                       NEW DRIVER API
 */

 /* @brief Add a Routing Attribute to a Netlink message
  * @param *req The Netlink message we're adding to
  * @param *reqsize The remaining space within the Netlink message
  * @param type The type of the RTA to add
  * @param len The length of the RTA data to add
  * @param *data A pointer to the RTA data to add
  * @return RMNETCTL_LIB_ERR if there is not enough space to add the RTA
  * @return RMNETCTL_SUCCESS if we added the RTA successfully
  */
static int rta_put(struct nlmsg *req, size_t *reqsize, int type, int len,
		   void *data)
{
	struct rtattr *attr = NLMSG_TAIL(&req->nl_addr);

	attr->rta_type = type;
	attr->rta_len = RTA_LENGTH(len);
	CHECK_MEMSCPY(memscpy_repeat(RTA_DATA(attr), reqsize, data, len));
	req->nl_addr.nlmsg_len = NLMSG_ALIGN(req->nl_addr.nlmsg_len) +
				 RTA_ALIGN(attr->rta_len);

	return RMNETCTL_SUCCESS;
}

/* @brief Add an RTA to the Netlink message with a u16 data
 * @param *req The Netlink message
 * @param *reqsize The remainins space within the Netlink message
 * @param type The type of the RTA to add
 * @param data The data of the RTA
 * @rteturn RMNETCTL_LIB_ERR if there is not enough space to add the RTA
 * @return RMNETCTL_SUCCESS if we added the RTA successfully
 */
static int rta_put_u16(struct nlmsg *req, size_t *reqsize, int type,
		       uint16_t data)
{
	return rta_put(req, reqsize, type, sizeof(data), &data);
}

/* @brief Add an RTA to the Netlink message with a u32 data
 * @param *req The Netlink message
 * @param *reqsize The remainins space within the Netlink message
 * @param type The type of the RTA to add
 * @param data The data of the RTA
 * @rteturn RMNETCTL_LIB_ERR if there is not enough space to add the RTA
 * @return RMNETCTL_SUCCESS if we added the RTA successfully
 */
static int rta_put_u32(struct nlmsg *req, size_t *reqsize, int type,
		       uint32_t data)
{
	return rta_put(req, reqsize, type, sizeof(data), &data);
}

/* @brief Add an RTA to the Netlink message with string data
 * @param *req The Netlink message
 * @param *reqsize The remainins space within the Netlink message
 * @param type The type of the RTA to add
 * @param *data The data of the RTA
 * @rteturn RMNETCTL_LIB_ERR if there is not enough space to add the RTA
 * @return RMNETCTL_SUCCESS if we added the RTA successfully
 */
static int rta_put_string(struct nlmsg *req, size_t *reqsize, int type,
			  char *data)
{
	return rta_put(req, reqsize, type, strlen(data) + 1, data);
}

/* @brief Start a nested RTA within the Netlink message
 * @param *req The Netlink message
 * @param *reqsize The remainins space within the Netlink message
 * @param type The type of the RTA to add
 * @param **start A pointer where we store the start of the ensted attribute
 * @rteturn RMNETCTL_LIB_ERR if there is not enough space to add the RTA
 * @return RMNETCTL_SUCCESS if we added the RTA successfully
 */
static int rta_nested_start(struct nlmsg *req, size_t *reqsize, int type,
			    struct rtattr **start)
{
	*start = NLMSG_TAIL(&req->nl_addr);
	return rta_put(req, reqsize, type, 0, NULL);
}

/* @brief End a nested RTA previously started with rta_nested_start
 * @param *req The Netlink message
 * @param *start The start of the nested RTA, as provided by rta_nested_start
 */
static void rta_nested_end(struct nlmsg *req, struct rtattr *start)
{
	start->rta_len = (char *)NLMSG_TAIL(&req->nl_addr) - (char *)start;
}

static void rta_parse(struct rtattr **tb, int maxtype, struct rtattr *head,
		      int len)
{
	struct rtattr *rta;

	memset(tb, 0, sizeof(struct rtattr *) * maxtype);
	for (rta = head; RTA_OK(rta, len);
	     rta = RTA_NEXT(rta, len)) {
		__u16 type = rta->rta_type & NLA_TYPE_MASK;

		if (type > 0 && type <= maxtype)
			tb[type] = rta;
	}
}

static struct rtattr *rta_find(struct rtattr *rta, int attrlen, uint16_t type)
{
	for (; RTA_OK(rta, attrlen); rta = RTA_NEXT(rta, attrlen)) {
		if (rta->rta_type == (type & NLA_TYPE_MASK))
			return rta;
	}

	return NULL;
}

/* @brief Fill a Netlink messages with the necessary common RTAs for creating a
 * RTM_NEWLINK message for creating or changing rmnet devices.
 * @param *req The netlink message
 * @param *reqsize The remaining space within the Netlink message
 * @param devindex The ifindex of the physical device
 * @param *vndname The name of the rmnet device
 * @param index The MUX ID of the rmnet device
 * @param flagconfig The dataformat flags for the rmnet device
 * @return RMNETCTL_LIB_ERR if there is not enough space to add all RTAs
 * @return RMNETCTL_SUCCESS if everything was added successfully
 */
static int rmnet_fill_newlink_msg(struct nlmsg *req, size_t *reqsize,
				  unsigned int devindex, char *vndname,
				  uint8_t index, uint32_t flagconfig)
{
	struct rtattr *linkinfo, *datainfo;
	struct ifla_vlan_flags flags;
	int rc;

	/* Set up link attr with devindex as data */
	rc = rta_put_u32(req, reqsize, IFLA_LINK, devindex);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	rc = rta_put_string(req, reqsize, IFLA_IFNAME, vndname);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	/* Set up info kind RMNET that has linkinfo and type */
	rc = rta_nested_start(req, reqsize, IFLA_LINKINFO, &linkinfo);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	rc = rta_put_string(req, reqsize, IFLA_INFO_KIND, "rmnet");
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	rc = rta_nested_start(req, reqsize, IFLA_INFO_DATA, &datainfo);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	rc = rta_put_u16(req, reqsize, RMNETCTL_IFLA_MUX_ID, index);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	if (flagconfig != 0) {
		flags.mask = flagconfig;
		flags.flags = flagconfig;

		rc = rta_put(req, reqsize, RMNETCTL_IFLA_FLAGS, sizeof(flags),
			     &flags);
		if (rc != RMNETCTL_SUCCESS)
			return rc;
	}

	rta_nested_end(req, datainfo);
	rta_nested_end(req, linkinfo);

	return RMNETCTL_SUCCESS;
}

/* @brief Add all necessary RTA elements to a Netlink message suitable for
 * sending to the DFC driver
 * @param *req The Netlink message
 * @param *reqsize The remaining space in the Netlink message
 * @param devindex The ifindex of the real physical device
 * @param *vndname The name of the VND we're modifying
 * @param *flowinfo The parameters sent to the DFC driver
 * @return RMENTCTL_LIB_ERR if there is not enough space to add the RTAs
 * @return RMNETCTL_SUCCESS if everything was added successfully
 */
static int rmnet_fill_flow_msg(struct nlmsg *req, size_t *reqsize,
			       unsigned int devindex, char *vndname,
			       struct tcmsg *flowinfo)
{
	struct rtattr *linkinfo, *datainfo;
	int rc;

	/* Set up link attr with devindex as data */
	rc = rta_put_u32(req, reqsize, IFLA_LINK, devindex);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	rc = rta_put_string(req, reqsize, IFLA_IFNAME, vndname);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	/* Set up IFLA info kind RMNET that has linkinfo and type */
	rc = rta_nested_start(req, reqsize, IFLA_LINKINFO, &linkinfo);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	rc = rta_put_string(req, reqsize, IFLA_INFO_KIND, "rmnet");
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	rc = rta_nested_start(req, reqsize, IFLA_INFO_DATA, &datainfo);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	rc = rta_put(req, reqsize, RMNETCTL_IFLA_DFC_QOS, sizeof(*flowinfo),
		     flowinfo);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	rta_nested_end(req, datainfo);
	rta_nested_end(req, linkinfo);

	return RMNETCTL_SUCCESS;
}

/* @brief Synchronous method to receive messages to and from the kernel
 * using netlink sockets
 * @details Receives the ack response from the kernel.
 * @param *hndl RmNet handle for this transaction
 * @param *error_code Error code if transaction fails
 * @return RMNETCTL_API_SUCCESS if successfully able to send and receive message
 * from the kernel
 * @return RMNETCTL_API_ERR_HNDL_INVALID if RmNet handle for the transaction was
 * NULL
 * @return RMNETCTL_API_ERR_MESSAGE_RECEIVE if could not receive message from
 * the kernel
 * @return RMNETCTL_API_ERR_MESSAGE_TYPE if the response type does not
 * match
 */
static int rmnet_get_ack(rmnetctl_hndl_t *hndl, uint16_t *error_code)
{
	struct nlack {
		struct nlmsghdr ackheader;
		struct nlmsgerr ackdata;
		char   data[256];

	} ack;
	int i;

	if (!hndl || !error_code)
		return RMNETCTL_INVALID_ARG;

	if ((i = recv(hndl->netlink_fd, &ack, sizeof(ack), 0)) < 0) {
		*error_code = errno;
		return RMNETCTL_API_ERR_MESSAGE_RECEIVE;
	}

	/*Ack should always be NLMSG_ERROR type*/
	if (ack.ackheader.nlmsg_type == NLMSG_ERROR) {
		if (ack.ackdata.error == 0) {
			*error_code = RMNETCTL_API_SUCCESS;
			return RMNETCTL_SUCCESS;
		} else {
			*error_code = -ack.ackdata.error;
			return RMNETCTL_KERNEL_ERR;
		}
	}

	*error_code = RMNETCTL_API_ERR_RETURN_TYPE;
	return RMNETCTL_API_FIRST_ERR;
}

/*
 *                       EXPOSED NEW DRIVER API
 */
int rtrmnet_ctl_init(rmnetctl_hndl_t **hndl, uint16_t *error_code)
{
	struct sockaddr_nl __attribute__((__may_alias__)) *saddr_ptr;
	int netlink_fd = -1;
	pid_t pid = 0;

	if (!hndl || !error_code)
		return RMNETCTL_INVALID_ARG;

	*hndl = (rmnetctl_hndl_t *)malloc(sizeof(rmnetctl_hndl_t));
	if (!*hndl) {
		*error_code = RMNETCTL_API_ERR_HNDL_INVALID;
		return RMNETCTL_LIB_ERR;
	}

	memset(*hndl, 0, sizeof(rmnetctl_hndl_t));

	pid = getpid();
	if (pid  < MIN_VALID_PROCESS_ID) {
		free(*hndl);
		*error_code = RMNETCTL_INIT_ERR_PROCESS_ID;
		return RMNETCTL_LIB_ERR;
	}
	(*hndl)->pid = KERNEL_PROCESS_ID;
	netlink_fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
	if (netlink_fd < MIN_VALID_SOCKET_FD) {
		free(*hndl);
		*error_code = RMNETCTL_INIT_ERR_NETLINK_FD;
		return RMNETCTL_LIB_ERR;
	}

	(*hndl)->netlink_fd = netlink_fd;

	memset(&(*hndl)->src_addr, 0, sizeof(struct sockaddr_nl));

	(*hndl)->src_addr.nl_family = AF_NETLINK;
	(*hndl)->src_addr.nl_pid = (*hndl)->pid;

	saddr_ptr = &(*hndl)->src_addr;
	if (bind((*hndl)->netlink_fd,
		(struct sockaddr *)saddr_ptr,
		sizeof(struct sockaddr_nl)) < 0) {
		close((*hndl)->netlink_fd);
		free(*hndl);
		*error_code = RMNETCTL_INIT_ERR_BIND;
		return RMNETCTL_LIB_ERR;
	}

	memset(&(*hndl)->dest_addr, 0, sizeof(struct sockaddr_nl));

	(*hndl)->dest_addr.nl_family = AF_NETLINK;
	(*hndl)->dest_addr.nl_pid = KERNEL_PROCESS_ID;
	(*hndl)->dest_addr.nl_groups = UNICAST;

	return RMNETCTL_SUCCESS;
}

int rtrmnet_ctl_deinit(rmnetctl_hndl_t *hndl)
{
	if (!hndl)
		return RMNETCTL_SUCCESS;

	close(hndl->netlink_fd);
	free(hndl);

	return RMNETCTL_SUCCESS;
}

int rtrmnet_ctl_newvnd(rmnetctl_hndl_t *hndl, char *devname, char *vndname,
		       uint16_t *error_code, uint8_t  index,
		       uint32_t flagconfig)
{
	unsigned int devindex = 0;
	struct nlmsg req;
	size_t reqsize;
	int rc;

	if (!hndl || !devname || !vndname || !error_code ||
	   _rmnetctl_check_dev_name(vndname) || _rmnetctl_check_dev_name(devname))
		return RMNETCTL_INVALID_ARG;

	memset(&req, 0, sizeof(req));
	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL |
				  NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of devname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
	rc = rta_put_u32(&req, &reqsize, RMNET_IFLA_NUM_TX_QUEUES,
			 RMNETCTL_NUM_TX_QUEUES);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	rc = rmnet_fill_newlink_msg(&req, &reqsize, devindex, vndname, index,
				    flagconfig);
	if (rc != RMNETCTL_SUCCESS)
		return rc;

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}

int rtrmnet_ctl_delvnd(rmnetctl_hndl_t *hndl, char *vndname,
		       uint16_t *error_code)
{
	unsigned int devindex = 0;
	struct nlmsg req;

	if (!hndl || !vndname || !error_code)
		return RMNETCTL_INVALID_ARG;

	memset(&req, 0, sizeof(req));
	req.nl_addr.nlmsg_type = RTM_DELLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of vndname*/
	devindex = if_nametoindex(vndname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	/* Setup index attribute */
	req.ifmsg.ifi_index = devindex;
	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}


int rtrmnet_ctl_changevnd(rmnetctl_hndl_t *hndl, char *devname, char *vndname,
			  uint16_t *error_code, uint8_t  index,
			  uint32_t flagconfig)
{
	struct nlmsg req;
	unsigned int devindex = 0;
	size_t reqsize;
	int rc;

	memset(&req, 0, sizeof(req));

	if (!hndl || !devname || !vndname || !error_code ||
	    _rmnetctl_check_dev_name(vndname) || _rmnetctl_check_dev_name(devname))
		return RMNETCTL_INVALID_ARG;

	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of devname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	rc = rmnet_fill_newlink_msg(&req, &reqsize, devindex, vndname, index,
				    flagconfig);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}

int rtrmnet_ctl_getvnd(rmnetctl_hndl_t *hndl, char *vndname,
		       uint16_t *error_code, uint16_t *mux_id,
		       uint32_t *flagconfig, uint8_t *agg_count,
		       uint16_t *agg_size, uint32_t *agg_time,
		       uint8_t *features)
{
	struct nlmsg req;
	struct nlmsghdr *resp;
	struct rtattr *attrs, *linkinfo, *datainfo;
	struct rtattr *tb[__RMNETCTL_IFLA_MAX];
	unsigned int devindex = 0;
	int resp_len;

	memset(&req, 0, sizeof(req));

	if (!hndl || !vndname || !error_code || !(mux_id || flagconfig) ||
	    _rmnetctl_check_dev_name(vndname))
		return RMNETCTL_INVALID_ARG;

	req.nl_addr.nlmsg_type = RTM_GETLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of vndname */
	devindex = if_nametoindex(vndname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	req.ifmsg.ifi_index = devindex;
	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	resp_len = recv(hndl->netlink_fd, NULL, 0, MSG_PEEK | MSG_TRUNC);
	if (resp_len < 0) {
		*error_code = errno;
		return RMNETCTL_API_ERR_MESSAGE_RECEIVE;
	}

	resp = malloc((size_t)resp_len);
	if (!resp) {
		*error_code = errno;
		return RMNETCTL_LIB_ERR;
	}

	resp_len = recv(hndl->netlink_fd, (char *)resp, (size_t)resp_len, 0);
	if (resp_len < 0) {
		*error_code = errno;
		free(resp);
		return RMNETCTL_API_ERR_MESSAGE_RECEIVE;
	}

	/* Parse out the RT attributes */
	attrs = (struct rtattr *)((char *)NLMSG_DATA(resp) +
				  NLMSG_ALIGN(sizeof(req.ifmsg)));
	linkinfo = rta_find(attrs, NLMSG_PAYLOAD(resp, sizeof(req.ifmsg)),
			    IFLA_LINKINFO);
	if (!linkinfo) {
		free(resp);
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return RMNETCTL_KERNEL_ERR;
	}

	datainfo = rta_find(RTA_DATA(linkinfo), RTA_PAYLOAD(linkinfo),
			    IFLA_INFO_DATA);
	if (!datainfo) {
		free(resp);
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return RMNETCTL_KERNEL_ERR;
	}

	/* Parse all the rmnet-specific information from the kernel */
	rta_parse(tb, __RMNETCTL_IFLA_MAX, RTA_DATA(datainfo),
		  RTA_PAYLOAD(datainfo));
	if (tb[RMNETCTL_IFLA_MUX_ID] && mux_id)
		*mux_id = *((uint16_t *)RTA_DATA(tb[RMNETCTL_IFLA_MUX_ID]));
	if (tb[RMNETCTL_IFLA_FLAGS] && flagconfig) {
		struct ifla_vlan_flags *flags;

		flags = (struct ifla_vlan_flags *)
			 RTA_DATA(tb[RMNETCTL_IFLA_FLAGS]);
		*flagconfig = flags->flags;
	}
	if (tb[RMNETCTL_IFLA_UPLINK_PARAMS]) {
		struct rmnetctl_uplink_params *ul_agg;

		ul_agg = (struct rmnetctl_uplink_params *)
			 RTA_DATA(tb[RMNETCTL_IFLA_UPLINK_PARAMS]);

		if (agg_size)
			*agg_size = ul_agg->byte_count;

		if (agg_count)
			*agg_count = ul_agg->packet_count;

		if (features)
			*features = ul_agg->features;

		if (agg_time)
			*agg_time = ul_agg->time_limit;
	}

	free(resp);
	return RMNETCTL_API_SUCCESS;
}

int rtrmnet_ctl_bridgevnd(rmnetctl_hndl_t *hndl, char *devname, char *vndname,
			  uint16_t *error_code)
{
	unsigned int devindex = 0, vndindex = 0;
	struct nlmsg req;
	size_t reqsize;
	int rc;

	if (!hndl || !vndname || !devname || !error_code || _rmnetctl_check_dev_name(vndname))
		return RMNETCTL_INVALID_ARG;

	memset(&req, 0, sizeof(req));
	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of vndname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	vndindex = if_nametoindex(vndname);
	if (vndindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	/* Setup index attribute */
	req.ifmsg.ifi_index = devindex;
	rc = rta_put_u32(&req, &reqsize, IFLA_MASTER, vndindex);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}

int rtrmnet_set_uplink_aggregation_params(rmnetctl_hndl_t *hndl,
					  char *devname,
					  char *vndname,
					  uint8_t packet_count,
					  uint16_t byte_count,
					  uint32_t time_limit,
					  uint8_t features,
					  uint16_t *error_code)
{
	struct nlmsg req;
	struct rmnetctl_uplink_params uplink_params;
	struct rtattr *linkinfo, *datainfo;
	unsigned int devindex = 0;
	size_t reqsize;
	int rc;

	memset(&req, 0, sizeof(req));
	memset(&uplink_params, 0, sizeof(uplink_params));

	if (!hndl || !devname || !error_code ||_rmnetctl_check_dev_name(devname) ||
		_rmnetctl_check_dev_name(vndname))
		return RMNETCTL_INVALID_ARG;

	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of devname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	/* Set up link attr with devindex as data */
	rc = rta_put_u32(&req, &reqsize, IFLA_LINK, devindex);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	rc = rta_put_string(&req, &reqsize, IFLA_IFNAME, vndname);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	/* Set up IFLA info kind RMNET that has linkinfo and type */
	rc = rta_nested_start(&req, &reqsize, IFLA_LINKINFO, &linkinfo);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	rc = rta_put_string(&req, &reqsize, IFLA_INFO_KIND, "rmnet");
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	rc = rta_nested_start(&req, &reqsize, IFLA_INFO_DATA, &datainfo);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	uplink_params.byte_count = byte_count;
	uplink_params.packet_count = packet_count;
	uplink_params.features = features;
	uplink_params.time_limit = time_limit;
	rc = rta_put(&req, &reqsize, RMNETCTL_IFLA_UPLINK_PARAMS,
		     sizeof(uplink_params), &uplink_params);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	rta_nested_end(&req, datainfo);
	rta_nested_end(&req, linkinfo);

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);

}

int rtrmnet_activate_flow(rmnetctl_hndl_t *hndl,
			  char *devname,
			  char *vndname,
			  uint8_t bearer_id,
			  uint32_t flow_id,
			  int ip_type,
			  uint32_t tcm_handle,
			  uint16_t *error_code)
{
	struct tcmsg  flowinfo;
	struct nlmsg req;
	unsigned int devindex = 0;
	size_t reqsize =0;
	int rc;

	memset(&req, 0, sizeof(req));
	memset(&flowinfo, 0, sizeof(flowinfo));


	if (!hndl || !devname || !error_code ||_rmnetctl_check_dev_name(devname) ||
		_rmnetctl_check_dev_name(vndname))
		return RMNETCTL_INVALID_ARG;

	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of devname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	flowinfo.tcm_handle = tcm_handle;
	flowinfo.tcm_family = RMNET_FLOW_MSG_ACTIVATE;
	flowinfo.tcm__pad1 = bearer_id;
	flowinfo.tcm_ifindex = ip_type;
	flowinfo.tcm_parent = flow_id;

	rc = rmnet_fill_flow_msg(&req, &reqsize, devindex, vndname, &flowinfo);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}


int rtrmnet_delete_flow(rmnetctl_hndl_t *hndl,
			  char *devname,
			  char *vndname,
			  uint8_t bearer_id,
			  uint32_t flow_id,
			  int ip_type,
			  uint16_t *error_code)
{
	struct tcmsg  flowinfo;
	struct nlmsg req;
	unsigned int devindex = 0;
	size_t reqsize;
	int rc;

	memset(&req, 0, sizeof(req));
	memset(&flowinfo, 0, sizeof(flowinfo));

	if (!hndl || !devname || !error_code ||_rmnetctl_check_dev_name(devname) ||
		_rmnetctl_check_dev_name(vndname))
		return RMNETCTL_INVALID_ARG;

	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of devname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	flowinfo.tcm_family = RMNET_FLOW_MSG_DEACTIVATE;
	flowinfo.tcm_ifindex = ip_type;
	flowinfo.tcm__pad1 = bearer_id;
	flowinfo.tcm_parent = flow_id;

	rc = rmnet_fill_flow_msg(&req, &reqsize, devindex, vndname, &flowinfo);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}

int rtrmnet_control_flow(rmnetctl_hndl_t *hndl,
			  char *devname,
			  char *vndname,
			  uint8_t bearer_id,
			  uint16_t sequence,
			  uint32_t grantsize,
			  uint8_t ack,
			  uint16_t *error_code)
{
	struct tcmsg  flowinfo;
	struct nlmsg req;
	unsigned int devindex = 0;
	size_t reqsize;
	int rc;

	memset(&req, 0, sizeof(req));
	memset(&flowinfo, 0, sizeof(flowinfo));

	if (!hndl || !devname || !error_code ||_rmnetctl_check_dev_name(devname) ||
		_rmnetctl_check_dev_name(vndname))
		return RMNETCTL_INVALID_ARG;

	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of devname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	flowinfo.tcm_family = RMNET_FLOW_MSG_CONTROL;
	flowinfo.tcm__pad1 = bearer_id;
	flowinfo.tcm__pad2 = sequence;
	flowinfo.tcm_parent = ack;
	flowinfo.tcm_info = grantsize;

	rc = rmnet_fill_flow_msg(&req, &reqsize, devindex, vndname, &flowinfo);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}


int rtrmnet_flow_state_up(rmnetctl_hndl_t *hndl,
			  char *devname,
			  char *vndname,
			  uint32_t instance,
			  uint32_t ep_type,
			  uint32_t ifaceid,
			  int flags,
			  uint16_t *error_code)
{
	struct tcmsg  flowinfo;
	struct nlmsg req;
	unsigned int devindex = 0;
	size_t reqsize;
	int rc;

	memset(&req, 0, sizeof(req));
	memset(&flowinfo, 0, sizeof(flowinfo));

	if (!hndl || !devname || !error_code ||_rmnetctl_check_dev_name(devname) ||
		_rmnetctl_check_dev_name(vndname))
		return RMNETCTL_INVALID_ARG;

	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of devname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	flowinfo.tcm_handle = instance;
	flowinfo.tcm_family = RMNET_FLOW_MSG_UP;
	flowinfo.tcm_ifindex = flags;
	flowinfo.tcm_parent = ifaceid;
	flowinfo.tcm_info = ep_type;

	rc = rmnet_fill_flow_msg(&req, &reqsize, devindex, vndname, &flowinfo);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}


int rtrmnet_flow_state_down(rmnetctl_hndl_t *hndl,
			  char *devname,
			  char *vndname,
			  uint32_t instance,
			  uint16_t *error_code)
{
	struct tcmsg  flowinfo;
	struct nlmsg req;
	unsigned int devindex = 0;
	size_t reqsize;
	int rc;

	memset(&req, 0, sizeof(req));
	memset(&flowinfo, 0, sizeof(flowinfo));

	if (!hndl || !devname || !error_code ||_rmnetctl_check_dev_name(devname) ||
		_rmnetctl_check_dev_name(vndname))
		return RMNETCTL_INVALID_ARG;

	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of devname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	flowinfo.tcm_handle = instance;
	flowinfo.tcm_family = RMNET_FLOW_MSG_DOWN;

	rc = rmnet_fill_flow_msg(&req, &reqsize, devindex, vndname, &flowinfo);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}

int rtrmnet_set_qmi_scale(rmnetctl_hndl_t *hndl,
			  char *devname,
			  char *vndname,
			  uint32_t scale,
			  uint16_t *error_code)
{
	struct tcmsg  flowinfo;
	struct nlmsg req;
	unsigned int devindex = 0;
	size_t reqsize;
	int rc;

	memset(&req, 0, sizeof(req));
	memset(&flowinfo, 0, sizeof(flowinfo));

	if (!hndl || !devname || !error_code ||_rmnetctl_check_dev_name(devname) ||
		_rmnetctl_check_dev_name(vndname) || !scale)
		return RMNETCTL_INVALID_ARG;

	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of devname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	flowinfo.tcm_ifindex = scale;
	flowinfo.tcm_family = RMNET_FLOW_MSG_QMI_SCALE;

	rc = rmnet_fill_flow_msg(&req, &reqsize, devindex, vndname, &flowinfo);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}

int rtrmnet_set_wda_freq(rmnetctl_hndl_t *hndl,
			 char *devname,
			 char *vndname,
			 uint32_t freq,
			 uint16_t *error_code)
{
	struct tcmsg  flowinfo;
	struct nlmsg req;
	unsigned int devindex = 0;
	size_t reqsize;
	int rc;

	memset(&req, 0, sizeof(req));
	memset(&flowinfo, 0, sizeof(flowinfo));

	if (!hndl || !devname || !error_code ||_rmnetctl_check_dev_name(devname) ||
		_rmnetctl_check_dev_name(vndname))
		return RMNETCTL_INVALID_ARG;

	reqsize = NLMSG_DATA_SIZE - sizeof(struct rtattr);
	req.nl_addr.nlmsg_type = RTM_NEWLINK;
	req.nl_addr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.nl_addr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nl_addr.nlmsg_seq = hndl->transaction_id;
	hndl->transaction_id++;

	/* Get index of devname*/
	devindex = if_nametoindex(devname);
	if (devindex == 0) {
		*error_code = errno;
		return RMNETCTL_KERNEL_ERR;
	}

	flowinfo.tcm_ifindex = freq;
	flowinfo.tcm_family = RMNET_FLOW_MSG_WDA_FREQ;

	rc = rmnet_fill_flow_msg(&req, &reqsize, devindex, vndname, &flowinfo);
	if (rc != RMNETCTL_SUCCESS) {
		*error_code = RMNETCTL_API_ERR_RTA_FAILURE;
		return rc;
	}

	if (send(hndl->netlink_fd, &req, req.nl_addr.nlmsg_len, 0) < 0) {
		*error_code = RMNETCTL_API_ERR_MESSAGE_SEND;
		return RMNETCTL_LIB_ERR;
	}

	return rmnet_get_ack(hndl, error_code);
}