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/*
* Copyright (c) 2017 Red Hat Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef NETNSID_H
#define NETNSID_H 1
#include <stdbool.h>
#ifdef HAVE_LINUX_NET_NAMESPACE_H
#include <linux/net_namespace.h>
#endif
/*
* The network namespace ID is a positive number that identifies the namespace
* which the netlink message was sent. It is used to identify if a received
* message belongs to a port attached to the bridge.
*
* There are three port states listed below:
* UNSET: A port in this state means that it could be either in same network
* namespace as the daemon (LOCAL) or in another namespace (ID). Any operation
* on a port in this state that requires the ID will trigger a query to the
* kernel to find out in which namespace the port currently is.
*
* LOCAL: A port in this state means that it is in the same network namespace
* as the daemons.
*
* ID: A port that is not LOCAL and not UNSET has a valid positive (zero
* included) remote namespace ID.
*
* Possible state changes:
*
* Initial port's state: UNSET.
*
* UNSET -> LOCAL: The daemon queries the kernel and finds that it's in the
* same network namespace as the daemon or the API is not available (older
* kernels).
*
* LOCAL -> UNSET: The kernel sends a deregistering netlink message which
* unsets the port. It happens when the port is removed (or moved to another
* network namespace).
*
* UNSET -> ID: The daemon queries the kernel and finds that the port is
* in a specific network namespace with ID assigned.
*
* ID -> UNSET: When it receives a deregistering netlink message from that
* namespace indicating the device is being removed (or moved to another
* network namespace).
*/
#ifdef NETNSA_NSID_NOT_ASSIGNED
#define NETNSID_LOCAL NETNSA_NSID_NOT_ASSIGNED
#else
#define NETNSID_LOCAL -1
#endif
#define NETNSID_UNSET (NETNSID_LOCAL - 1)
/* Prototypes */
static inline void netnsid_set_local(int *nsid);
static inline bool netnsid_is_local(int nsid);
static inline void netnsid_unset(int *nsid);
static inline bool netnsid_is_unset(int nsid);
static inline bool netnsid_is_remote(int nsid);
static inline void netnsid_set(int *nsid, int id);
static inline bool netnsid_eq(int nsid1, int nsid2);
/* Functions */
static inline void
netnsid_set_local(int *nsid)
{
*nsid = NETNSID_LOCAL;
}
static inline bool
netnsid_is_local(int nsid)
{
return nsid == NETNSID_LOCAL;
}
static inline void
netnsid_unset(int *nsid)
{
*nsid = NETNSID_UNSET;
}
static inline bool
netnsid_is_unset(int nsid)
{
return nsid == NETNSID_UNSET;
}
static inline bool
netnsid_is_remote(int nsid)
{
if (netnsid_is_unset(nsid) || netnsid_is_local(nsid)) {
return false;
}
return true;
}
static inline void
netnsid_set(int *nsid, int id)
{
/* The kernel only sends positive numbers for valid IDs. */
if (id != NETNSID_LOCAL) {
ovs_assert(id >= 0);
}
*nsid = id;
}
static inline bool
netnsid_eq(int nsid1, int nsid2)
{
if (netnsid_is_unset(nsid1) || netnsid_is_unset(nsid2)) {
return false;
}
if (nsid1 == nsid2) {
return true;
}
return false;
}
#endif
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