Function tap_nlattr_add

dpdk/drivers/net/tap/tap_netlink.c:294–307

* Append a netlink attribute to a message. * * @param[in, out] nh * The netlink message to parse, received from the kernel. * @param[in] type * The type of attribute to append. * @param[in] data_len * The length of the data to append. * @param[in] data * The data to append. */

 *   The data to append.
 */
void
tap_nlattr_add(struct nlmsghdr *nh, unsigned short type,
	   unsigned int data_len, const void *data)
{
	/* see man 3 rtnetlink */
	struct rtattr *rta;

	rta = (struct rtattr *)NLMSG_TAIL(nh);
	rta->rta_len = RTA_LENGTH(data_len);
	rta->rta_type = type;
	if (data_len > 0)
		memcpy(RTA_DATA(rta), data, data_len);
	nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(rta->rta_len);
}

/**
 * Append a uint8_t netlink attribute to a message.