2 * Copyright (c) 2008, 2009, 2010 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef VCONN_PROVIDER_H
18 #define VCONN_PROVIDER_H 1
20 /* Provider interface to vconns, which provide a virtual connection to an
26 /* Active virtual connection to an OpenFlow device. */
28 /* Active virtual connection to an OpenFlow device.
30 * This structure should be treated as opaque by vconn implementations. */
32 struct vconn_class *class;
44 void vconn_init(struct vconn *, struct vconn_class *, int connect_status,
46 void vconn_set_remote_ip(struct vconn *, ovs_be32 remote_ip);
47 void vconn_set_remote_port(struct vconn *, ovs_be16 remote_port);
48 void vconn_set_local_ip(struct vconn *, ovs_be32 local_ip);
49 void vconn_set_local_port(struct vconn *, ovs_be16 local_port);
50 static inline void vconn_assert_class(const struct vconn *vconn,
51 const struct vconn_class *class)
53 assert(vconn->class == class);
57 /* Prefix for connection names, e.g. "nl", "tcp". */
60 /* Attempts to connect to an OpenFlow device. 'name' is the full
61 * connection name provided by the user, e.g. "tcp:1.2.3.4". This name is
62 * useful for error messages but must not be modified.
64 * 'suffix' is a copy of 'name' following the colon and may be modified.
65 * 'dscp' is the DSCP value that the new connection should use in the IP
68 * Returns 0 if successful, otherwise a positive errno value. If
69 * successful, stores a pointer to the new connection in '*vconnp'.
71 * The open function must not block waiting for a connection to complete.
72 * If the connection cannot be completed immediately, it should return
73 * EAGAIN (not EINPROGRESS, as returned by the connect system call) and
74 * continue the connection in the background. */
75 int (*open)(const char *name, char *suffix, struct vconn **vconnp,
78 /* Closes 'vconn' and frees associated memory. */
79 void (*close)(struct vconn *vconn);
81 /* Tries to complete the connection on 'vconn'. If 'vconn''s connection is
82 * complete, returns 0 if the connection was successful or a positive errno
83 * value if it failed. If the connection is still in progress, returns
86 * The connect function must not block waiting for the connection to
87 * complete; instead, it should return EAGAIN immediately. */
88 int (*connect)(struct vconn *vconn);
90 /* Tries to receive an OpenFlow message from 'vconn'. If successful,
91 * stores the received message into '*msgp' and returns 0. The caller is
92 * responsible for destroying the message with ofpbuf_delete(). On
93 * failure, returns a positive errno value and stores a null pointer into
96 * If the connection has been closed in the normal fashion, returns EOF.
98 * The recv function must not block waiting for a packet to arrive. If no
99 * packets have been received, it should return EAGAIN. */
100 int (*recv)(struct vconn *vconn, struct ofpbuf **msgp);
102 /* Tries to queue 'msg' for transmission on 'vconn'. If successful,
103 * returns 0, in which case ownership of 'msg' is transferred to the vconn.
104 * Success does not guarantee that 'msg' has been or ever will be delivered
105 * to the peer, only that it has been queued for transmission.
107 * Returns a positive errno value on failure, in which case the caller
108 * retains ownership of 'msg'.
110 * The send function must not block. If 'msg' cannot be immediately
111 * accepted for transmission, it should return EAGAIN. */
112 int (*send)(struct vconn *vconn, struct ofpbuf *msg);
114 /* Allows 'vconn' to perform maintenance activities, such as flushing
117 * May be null if 'vconn' doesn't have anything to do here. */
118 void (*run)(struct vconn *vconn);
120 /* Arranges for the poll loop to wake up when 'vconn' needs to perform
121 * maintenance activities.
123 * May be null if 'vconn' doesn't have anything to do here. */
124 void (*run_wait)(struct vconn *vconn);
126 /* Arranges for the poll loop to wake up when 'vconn' is ready to take an
127 * action of the given 'type'. */
128 void (*wait)(struct vconn *vconn, enum vconn_wait_type type);
131 /* Passive virtual connection to an OpenFlow device.
133 * This structure should be treated as opaque by vconn implementations. */
135 struct pvconn_class *class;
139 void pvconn_init(struct pvconn *, struct pvconn_class *, const char *name);
140 static inline void pvconn_assert_class(const struct pvconn *pvconn,
141 const struct pvconn_class *class)
143 assert(pvconn->class == class);
146 struct pvconn_class {
147 /* Prefix for connection names, e.g. "ptcp", "pssl". */
150 /* Attempts to start listening for OpenFlow connections. 'name' is the
151 * full connection name provided by the user, e.g. "ptcp:1234". This name
152 * is useful for error messages but must not be modified.
154 * 'suffix' is a copy of 'name' following the colon and may be modified.
155 * 'dscp' is the DSCP value that the new connection should use in the IP
158 * Returns 0 if successful, otherwise a positive errno value. If
159 * successful, stores a pointer to the new connection in '*pvconnp'.
161 * The listen function must not block. If the connection cannot be
162 * completed immediately, it should return EAGAIN (not EINPROGRESS, as
163 * returned by the connect system call) and continue the connection in the
165 int (*listen)(const char *name, char *suffix, struct pvconn **pvconnp,
168 /* Closes 'pvconn' and frees associated memory. */
169 void (*close)(struct pvconn *pvconn);
171 /* Tries to accept a new connection on 'pvconn'. If successful, stores the
172 * new connection in '*new_vconnp' and returns 0. Otherwise, returns a
173 * positive errno value.
175 * The accept function must not block waiting for a connection. If no
176 * connection is ready to be accepted, it should return EAGAIN. */
177 int (*accept)(struct pvconn *pvconn, struct vconn **new_vconnp);
179 /* Arranges for the poll loop to wake up when a connection is ready to be
180 * accepted on 'pvconn'. */
181 void (*wait)(struct pvconn *pvconn);
184 /* Active and passive vconn classes. */
185 extern struct vconn_class tcp_vconn_class;
186 extern struct pvconn_class ptcp_pvconn_class;
187 extern struct vconn_class unix_vconn_class;
188 extern struct pvconn_class punix_pvconn_class;
190 extern struct vconn_class ssl_vconn_class;
191 extern struct pvconn_class pssl_pvconn_class;
194 #endif /* vconn-provider.h */