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/*
* Copyright (c) 2008, 2009, 2010, 2012, 2013 Nicira, 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 VCONN_PROVIDER_H
#define VCONN_PROVIDER_H 1
/* Provider interface to vconns, which provide a virtual connection to an
* OpenFlow device. */
#include "vconn.h"
#include "util.h"
#include "openflow/openflow-common.h"
/* Active virtual connection to an OpenFlow device. */
/* Active virtual connection to an OpenFlow device.
*
* This structure should be treated as opaque by vconn implementations. */
struct vconn {
const struct vconn_class *class;
int state;
int error;
/* OpenFlow versions. */
uint32_t allowed_versions; /* Bitmap of versions we will accept. */
uint32_t peer_versions; /* Peer's bitmap of versions it will accept. */
enum ofp_version version; /* Negotiated version (or 0). */
bool recv_any_version; /* True to receive a message of any version. */
char *name;
};
void vconn_init(struct vconn *, const struct vconn_class *, int connect_status,
const char *name, uint32_t allowed_versions);
void vconn_free_data(struct vconn *vconn);
static inline void vconn_assert_class(const struct vconn *vconn,
const struct vconn_class *class)
{
ovs_assert(vconn->class == class);
}
struct vconn_class {
/* Prefix for connection names, e.g. "nl", "tcp". */
const char *name;
/* Attempts to connect to an OpenFlow device. 'name' is the full
* connection name provided by the user, e.g. "tcp:1.2.3.4". This name is
* useful for error messages but must not be modified.
*
* 'allowed_versions' is the OpenFlow versions that may be
* negotiated for a connection.
*
* 'suffix' is a copy of 'name' following the colon and may be modified.
* 'dscp' is the DSCP value that the new connection should use in the IP
* packets it sends.
*
* Returns 0 if successful, otherwise a positive errno value. If
* successful, stores a pointer to the new connection in '*vconnp'.
*
* The open function must not block waiting for a connection to complete.
* If the connection cannot be completed immediately, it should return
* EAGAIN (not EINPROGRESS, as returned by the connect system call) and
* continue the connection in the background. */
int (*open)(const char *name, uint32_t allowed_versions,
char *suffix, struct vconn **vconnp, uint8_t dscp);
/* Closes 'vconn' and frees associated memory. */
void (*close)(struct vconn *vconn);
/* Tries to complete the connection on 'vconn'. If 'vconn''s connection is
* complete, returns 0 if the connection was successful or a positive errno
* value if it failed. If the connection is still in progress, returns
* EAGAIN.
*
* The connect function must not block waiting for the connection to
* complete; instead, it should return EAGAIN immediately. */
int (*connect)(struct vconn *vconn);
/* Tries to receive an OpenFlow message from 'vconn'. If successful,
* stores the received message into '*msgp' and returns 0. The caller is
* responsible for destroying the message with ofpbuf_delete(). On
* failure, returns a positive errno value and stores a null pointer into
* '*msgp'.
*
* If the connection has been closed in the normal fashion, returns EOF.
*
* The recv function must not block waiting for a packet to arrive. If no
* packets have been received, it should return EAGAIN. */
int (*recv)(struct vconn *vconn, struct ofpbuf **msgp);
/* Tries to queue 'msg' for transmission on 'vconn'. If successful,
* returns 0, in which case ownership of 'msg' is transferred to the vconn.
* Success does not guarantee that 'msg' has been or ever will be delivered
* to the peer, only that it has been queued for transmission.
*
* Returns a positive errno value on failure, in which case the caller
* retains ownership of 'msg'.
*
* The send function must not block. If 'msg' cannot be immediately
* accepted for transmission, it should return EAGAIN. */
int (*send)(struct vconn *vconn, struct ofpbuf *msg);
/* Allows 'vconn' to perform maintenance activities, such as flushing
* output buffers.
*
* May be null if 'vconn' doesn't have anything to do here. */
void (*run)(struct vconn *vconn);
/* Arranges for the poll loop to wake up when 'vconn' needs to perform
* maintenance activities.
*
* May be null if 'vconn' doesn't have anything to do here. */
void (*run_wait)(struct vconn *vconn);
/* Arranges for the poll loop to wake up when 'vconn' is ready to take an
* action of the given 'type'. */
void (*wait)(struct vconn *vconn, enum vconn_wait_type type);
};
/* Passive virtual connection to an OpenFlow device.
*
* This structure should be treated as opaque by vconn implementations. */
struct pvconn {
const struct pvconn_class *class;
char *name;
uint32_t allowed_versions;
};
void pvconn_init(struct pvconn *pvconn, const struct pvconn_class *class,
const char *name, uint32_t allowed_versions);
static inline void pvconn_assert_class(const struct pvconn *pvconn,
const struct pvconn_class *class)
{
ovs_assert(pvconn->class == class);
}
struct pvconn_class {
/* Prefix for connection names, e.g. "ptcp", "pssl". */
const char *name;
/* Attempts to start listening for OpenFlow connections. 'name' is the
* full connection name provided by the user, e.g. "ptcp:1234". This name
* is useful for error messages but must not be modified.
*
* 'allowed_versions' is the OpenFlow protocol versions that may
* be negotiated for a session.
*
* 'suffix' is a copy of 'name' following the colon and may be modified.
* 'dscp' is the DSCP value that the new connection should use in the IP
* packets it sends.
*
* Returns 0 if successful, otherwise a positive errno value. If
* successful, stores a pointer to the new connection in '*pvconnp'.
*
* The listen function must not block. If the connection cannot be
* completed immediately, it should return EAGAIN (not EINPROGRESS, as
* returned by the connect system call) and continue the connection in the
* background. */
int (*listen)(const char *name, uint32_t allowed_versions,
char *suffix, struct pvconn **pvconnp, uint8_t dscp);
/* Closes 'pvconn' and frees associated memory. */
void (*close)(struct pvconn *pvconn);
/* Tries to accept a new connection on 'pvconn'. If successful, stores the
* new connection in '*new_vconnp' and returns 0. Otherwise, returns a
* positive errno value.
*
* The accept function must not block waiting for a connection. If no
* connection is ready to be accepted, it should return EAGAIN. */
int (*accept)(struct pvconn *pvconn, struct vconn **new_vconnp);
/* Arranges for the poll loop to wake up when a connection is ready to be
* accepted on 'pvconn'. */
void (*wait)(struct pvconn *pvconn);
};
/* Active and passive vconn classes. */
extern const struct vconn_class tcp_vconn_class;
extern const struct pvconn_class ptcp_pvconn_class;
extern const struct vconn_class unix_vconn_class;
extern const struct pvconn_class punix_pvconn_class;
#ifdef HAVE_OPENSSL
extern const struct vconn_class ssl_vconn_class;
extern const struct pvconn_class pssl_pvconn_class;
#endif
#endif /* vconn-provider.h */
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