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 "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;
};

/* Uplink Aggregation contexts for the RT RmNet driver */
enum {
	RMNETCTL_DEFAULT_UL_AGG_STATE,
	RMNETCTL_LL_UL_AGG_STATE,
	RMNETCTL_MAX_UL_AGG_STATE,
};

/* 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_UPLINK_STATE_ID,
	__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,
	/* Change underlying transport channel */
	RMNET_FLOW_MSG_CHANNEL_SWITCH = 8,
};

/* 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 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) >= IFNAMSIZ)
		break;
	return_code = RMNETCTL_SUCCESS;
	} while(0);
	return return_code;
}

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

/*
 *                       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 u8 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_u8(struct nlmsg *req, size_t *reqsize, int type,
		      uint8_t data)
{
	return rta_put(req, reqsize, type, sizeof(data), &data);
}

/* @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 Fill a Netlink messages with the necessary common RTAs for creating a
 * RTM_NEWLINK message that configures the uplink aggregation parameters
 * @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 packet_count The max packet count
 * @param byte_count The max byte count
 * @param time_limit The max time limit
 * @param features The enabled aggregatin features
 * @param state_id The aggregation state to configure
 * @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_ul_agg_msg(struct nlmsg *req, size_t *reqsize,
				 unsigned int devindex, char *vndname,
				 uint8_t packet_count, uint16_t byte_count,
				 uint32_t time_limit, uint8_t features,
				 uint8_t state_id)
{
	struct rmnetctl_uplink_params uplink_params;
	struct rtattr *linkinfo, *datainfo;
	int rc;

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

	/* 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;

	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)
		return rc;

	if (state_id != RMNETCTL_DEFAULT_UL_AGG_STATE) {
		rc = rta_put_u8(req, reqsize, RMNETCTL_IFLA_UPLINK_STATE_ID,
				state_id);
		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
 * @param flowlen The length of the flowinfo parameter in bytes
 * @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,
			       char *flowinfo, size_t flowlen)
{
	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, flowlen,
		     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;
	socklen_t addr_len = sizeof(struct sockaddr_nl);

	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));

	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;

	(*hndl)->src_addr.nl_family = AF_NETLINK;
	(*hndl)->src_addr.nl_pid = 0; /* auto assign */

	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;
	}

	/* Get assigned port_id */
	if (!getsockname(netlink_fd, (struct sockaddr *)saddr_ptr, &addr_len))
		(*hndl)->pid = (*hndl)->src_addr.nl_pid;

	(*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;

	if (hndl->llc_hndl)
		rtrmnet_ctl_deinit(hndl->llc_hndl);

	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;
	unsigned int devindex = 0;
	size_t reqsize;
	int rc;

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

	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;
	}

	rc = rmnet_fill_ul_agg_msg(&req, &reqsize, devindex, vndname,
				   packet_count, byte_count, time_limit,
				   features, RMNETCTL_DEFAULT_UL_AGG_STATE);
	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_ll_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;
	unsigned int devindex = 0;
	size_t reqsize;
	int rc;

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

	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;
	}

	rc = rmnet_fill_ul_agg_msg(&req, &reqsize, devindex, vndname,
				   packet_count, byte_count, time_limit,
				   features, RMNETCTL_LL_UL_AGG_STATE);
	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_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,
				 (char *)&flowinfo, sizeof(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,
				 (char *)&flowinfo,sizeof(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,
				 (char *)&flowinfo, sizeof(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,
				 (char *)&flowinfo, sizeof(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,
				 (char *)&flowinfo, sizeof(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,
				 (char *)&flowinfo, sizeof(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,
				 (char *)&flowinfo, sizeof(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_change_bearer_channel(rmnetctl_hndl_t *hndl,
				  char *devname,
				  char *vndname,
				  uint8_t switch_type,
				  uint32_t flags,
				  uint8_t num_bearers,
				  uint8_t *bearers,
				  uint16_t *error_code)
{
	struct nlmsg req;
	struct {
		struct tcmsg tcm;
		uint8_t data[16]; /* Max number of bearers */
	} flowinfo;
	unsigned int devindex;
	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) || num_bearers > 16 || !bearers)
		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;
	}

	/* Create 2nd hndl to receive LLC status */
	if ((flags & RMNETCTL_LL_MASK_ACK) && !hndl->llc_hndl) {
		rc = rtrmnet_ctl_init(&hndl->llc_hndl, error_code);
		if (rc != RMNETCTL_SUCCESS) {
			hndl->llc_hndl = NULL;
			return rc;
		}
	}

	/* Fill the flow information */
	flowinfo.tcm.tcm_family = RMNET_FLOW_MSG_CHANNEL_SWITCH;
	flowinfo.tcm.tcm__pad1 = switch_type;
	flowinfo.tcm.tcm__pad2 = num_bearers;
	flowinfo.tcm.tcm_info = flags;
	memscpy(flowinfo.data, 16, bearers, num_bearers);
	/* DFC needs this to send the ACK back to LLC socket specifically */
	if (hndl->llc_hndl) {
		flowinfo.tcm.tcm_ifindex = hndl->llc_hndl->netlink_fd;
		flowinfo.tcm.tcm_handle = hndl->llc_hndl->pid;
		flowinfo.tcm.tcm_parent = hndl->transaction_id--;
	}

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

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

	/* Initial ACK: The kernel got the message */
	return rmnet_get_ack(hndl, error_code);
}

int rtrmnet_get_ll_ack(rmnetctl_hndl_t *hndl,
		       struct rmnetctl_ll_ack *ll_ack,
		       uint16_t *error_code)
{
	struct nlack {
		struct nlmsghdr ackheader;
		struct nlmsgerr ackdata;

	} ack;
	int i;

	if (!hndl || !hndl->llc_hndl || !ll_ack || !error_code)
		return RMNETCTL_INVALID_ARG;

	if ((i = recv(hndl->llc_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) {
			ll_ack->bearer_id =
				(uint8_t)ack.ackdata.msg.nlmsg_type;
			ll_ack->status_code =
				(uint8_t)ack.ackdata.msg.nlmsg_flags;
			ll_ack->current_ch =
				(uint8_t)ack.ackdata.msg.nlmsg_seq;
			*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;
}

static const char *rmnetctl_ll_status_text[] = {
        "Error",
        "Success",
        "Switched to Default",
        "Switched to LL",
        "Temporary Failure",
        "Permanent Failure"
};

const char *rtrmnet_ll_status_to_text(uint8_t status)
{
	if (status == LL_STATUS_TIMEOUT)
		return "Time out";

	if (status == LL_STATUS_NO_EFFECT)
		return "No Effect";

	if (status < sizeof(rmnetctl_ll_status_text) /
		     sizeof(rmnetctl_ll_status_text[0]))
		return rmnetctl_ll_status_text[status];

	return "Unknown";
}