/**
* Add qdisc
* @arg sk Netlink socket
* @arg qdisc Qdisc to add
* @arg flags Additional netlink message flags
*
* Builds a \c RTM_NEWQDISC netlink message requesting the addition
* of a new qdisc and sends the message to the kernel. The configuration
* of the qdisc is derived from the attributes of the specified qdisc.
*
* The following flags may be specified:
* - \c NLM_F_CREATE: Create qdisc if it does not exist, otherwise
* -NLE_OBJ_NOTFOUND is returned.
* - \c NLM_F_REPLACE: If another qdisc is already attached to the
* parent, replace it even if the handles mismatch.
* - \c NLM_F_EXCL: Return -NLE_EXISTS if a qdisc with matching
* handle exists already.
*
* Existing qdiscs with matching handles will be updated, unless the
* flag \c NLM_F_EXCL is specified. If their handles do not match, the
* error -NLE_EXISTS is returned unless the flag \c NLM_F_REPLACE is
* specified in which case the existing qdisc is replaced with the new
* one. If no matching qdisc exists, it will be created if the flag
* \c NLM_F_CREATE is set, otherwise the error -NLE_OBJ_NOTFOUND is
* returned.
*
* After sending, the function will wait for the ACK or an eventual
* error message to be received and will therefore block until the
* operation has been completed.
*
* @note Disabling auto-ack (nl_socket_disable_auto_ack()) will cause
* this function to return immediately after sending. In this case,
* it is the responsibility of the caller to handle any error
* messages returned.
*
* @return 0 on success or a negative error code.
*/
int rtnl_qdisc_add(struct nl_sock *sk, struct rtnl_qdisc *qdisc, int flags)
{
struct nl_msg *msg;
int err;
if ((err = rtnl_qdisc_build_add_request(qdisc, flags, &msg)) < 0)
return err;
return nl_send_sync(sk, msg);
}
/**
* Add a new qdisc
* @arg sk Netlink socket.
* @arg qdisc qdisc to delete
* @arg flags additional netlink message flags
*
* Builds a netlink message by calling rtnl_qdisc_build_add_request(),
* sends the request to the kernel and waits for the ACK to be
* received and thus blocks until the request has been processed.
*
* Common message flags used:
* - NLM_F_REPLACE - replace a potential existing qdisc
*
* @return 0 on success or a negative error code
*/
int rtnl_qdisc_add(struct nl_sock *sk, struct rtnl_qdisc *qdisc,
int flags)
{
struct nl_msg *msg;
int err;
if ((err = rtnl_qdisc_build_add_request(qdisc, flags, &msg)) < 0)
return err;
err = nl_send_auto_complete(sk, msg);
nlmsg_free(msg);
if (err < 0)
return err;
return wait_for_ack(sk);
}
