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064af421 | 1 | /* |
4766ce7a | 2 | * Copyright (c) 2008, 2009, 2010, 2012, 2013 Nicira, Inc. |
064af421 | 3 | * |
a14bc59f BP |
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: | |
064af421 | 7 | * |
a14bc59f BP |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * | |
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. | |
064af421 BP |
15 | */ |
16 | ||
17 | #ifndef VCONN_PROVIDER_H | |
18 | #define VCONN_PROVIDER_H 1 | |
19 | ||
20 | /* Provider interface to vconns, which provide a virtual connection to an | |
21 | * OpenFlow device. */ | |
22 | ||
064af421 | 23 | #include "vconn.h" |
cb22974d | 24 | #include "util.h" |
2e3fa633 | 25 | #include "openflow/openflow-common.h" |
064af421 BP |
26 | \f |
27 | /* Active virtual connection to an OpenFlow device. */ | |
28 | ||
29 | /* Active virtual connection to an OpenFlow device. | |
30 | * | |
31 | * This structure should be treated as opaque by vconn implementations. */ | |
32 | struct vconn { | |
5b712636 | 33 | const struct vconn_class *class; |
064af421 BP |
34 | int state; |
35 | int error; | |
4766ce7a BP |
36 | |
37 | /* OpenFlow versions. */ | |
38 | uint32_t allowed_versions; /* Bitmap of versions we will accept. */ | |
39 | uint32_t peer_versions; /* Peer's bitmap of versions it will accept. */ | |
40 | enum ofp_version version; /* Negotiated version (or 0). */ | |
41 | bool recv_any_version; /* True to receive a message of any version. */ | |
42 | ||
064af421 | 43 | char *name; |
064af421 BP |
44 | }; |
45 | ||
5b712636 | 46 | void vconn_init(struct vconn *, const struct vconn_class *, int connect_status, |
7a25bd99 SH |
47 | const char *name, uint32_t allowed_versions); |
48 | void vconn_free_data(struct vconn *vconn); | |
064af421 BP |
49 | static inline void vconn_assert_class(const struct vconn *vconn, |
50 | const struct vconn_class *class) | |
51 | { | |
cb22974d | 52 | ovs_assert(vconn->class == class); |
064af421 BP |
53 | } |
54 | ||
55 | struct vconn_class { | |
56 | /* Prefix for connection names, e.g. "nl", "tcp". */ | |
57 | const char *name; | |
58 | ||
59 | /* Attempts to connect to an OpenFlow device. 'name' is the full | |
60 | * connection name provided by the user, e.g. "tcp:1.2.3.4". This name is | |
61 | * useful for error messages but must not be modified. | |
62 | * | |
76033fbe | 63 | * 'allowed_versions' is the OpenFlow versions that may be |
7a25bd99 SH |
64 | * negotiated for a connection. |
65 | * | |
064af421 | 66 | * 'suffix' is a copy of 'name' following the colon and may be modified. |
f125905c | 67 | * 'dscp' is the DSCP value that the new connection should use in the IP |
ef8a3d14 | 68 | * packets it sends. |
064af421 BP |
69 | * |
70 | * Returns 0 if successful, otherwise a positive errno value. If | |
71 | * successful, stores a pointer to the new connection in '*vconnp'. | |
72 | * | |
73 | * The open function must not block waiting for a connection to complete. | |
74 | * If the connection cannot be completed immediately, it should return | |
75 | * EAGAIN (not EINPROGRESS, as returned by the connect system call) and | |
76 | * continue the connection in the background. */ | |
7a25bd99 SH |
77 | int (*open)(const char *name, uint32_t allowed_versions, |
78 | char *suffix, struct vconn **vconnp, uint8_t dscp); | |
064af421 BP |
79 | |
80 | /* Closes 'vconn' and frees associated memory. */ | |
81 | void (*close)(struct vconn *vconn); | |
82 | ||
83 | /* Tries to complete the connection on 'vconn'. If 'vconn''s connection is | |
84 | * complete, returns 0 if the connection was successful or a positive errno | |
85 | * value if it failed. If the connection is still in progress, returns | |
86 | * EAGAIN. | |
87 | * | |
88 | * The connect function must not block waiting for the connection to | |
89 | * complete; instead, it should return EAGAIN immediately. */ | |
90 | int (*connect)(struct vconn *vconn); | |
91 | ||
92 | /* Tries to receive an OpenFlow message from 'vconn'. If successful, | |
93 | * stores the received message into '*msgp' and returns 0. The caller is | |
94 | * responsible for destroying the message with ofpbuf_delete(). On | |
95 | * failure, returns a positive errno value and stores a null pointer into | |
96 | * '*msgp'. | |
97 | * | |
98 | * If the connection has been closed in the normal fashion, returns EOF. | |
99 | * | |
100 | * The recv function must not block waiting for a packet to arrive. If no | |
101 | * packets have been received, it should return EAGAIN. */ | |
102 | int (*recv)(struct vconn *vconn, struct ofpbuf **msgp); | |
103 | ||
104 | /* Tries to queue 'msg' for transmission on 'vconn'. If successful, | |
105 | * returns 0, in which case ownership of 'msg' is transferred to the vconn. | |
106 | * Success does not guarantee that 'msg' has been or ever will be delivered | |
107 | * to the peer, only that it has been queued for transmission. | |
108 | * | |
109 | * Returns a positive errno value on failure, in which case the caller | |
110 | * retains ownership of 'msg'. | |
111 | * | |
112 | * The send function must not block. If 'msg' cannot be immediately | |
113 | * accepted for transmission, it should return EAGAIN. */ | |
114 | int (*send)(struct vconn *vconn, struct ofpbuf *msg); | |
115 | ||
60cb3eb8 BP |
116 | /* Allows 'vconn' to perform maintenance activities, such as flushing |
117 | * output buffers. | |
118 | * | |
119 | * May be null if 'vconn' doesn't have anything to do here. */ | |
120 | void (*run)(struct vconn *vconn); | |
121 | ||
122 | /* Arranges for the poll loop to wake up when 'vconn' needs to perform | |
123 | * maintenance activities. | |
124 | * | |
125 | * May be null if 'vconn' doesn't have anything to do here. */ | |
126 | void (*run_wait)(struct vconn *vconn); | |
127 | ||
064af421 BP |
128 | /* Arranges for the poll loop to wake up when 'vconn' is ready to take an |
129 | * action of the given 'type'. */ | |
130 | void (*wait)(struct vconn *vconn, enum vconn_wait_type type); | |
131 | }; | |
132 | \f | |
133 | /* Passive virtual connection to an OpenFlow device. | |
134 | * | |
135 | * This structure should be treated as opaque by vconn implementations. */ | |
136 | struct pvconn { | |
5b712636 | 137 | const struct pvconn_class *class; |
064af421 | 138 | char *name; |
7a25bd99 | 139 | uint32_t allowed_versions; |
064af421 BP |
140 | }; |
141 | ||
5b712636 | 142 | void pvconn_init(struct pvconn *pvconn, const struct pvconn_class *class, |
7a25bd99 | 143 | const char *name, uint32_t allowed_versions); |
064af421 BP |
144 | static inline void pvconn_assert_class(const struct pvconn *pvconn, |
145 | const struct pvconn_class *class) | |
146 | { | |
cb22974d | 147 | ovs_assert(pvconn->class == class); |
064af421 BP |
148 | } |
149 | ||
150 | struct pvconn_class { | |
151 | /* Prefix for connection names, e.g. "ptcp", "pssl". */ | |
152 | const char *name; | |
153 | ||
154 | /* Attempts to start listening for OpenFlow connections. 'name' is the | |
155 | * full connection name provided by the user, e.g. "ptcp:1234". This name | |
156 | * is useful for error messages but must not be modified. | |
157 | * | |
7a25bd99 SH |
158 | * 'allowed_versions' is the OpenFlow protocol versions that may |
159 | * be negotiated for a session. | |
160 | * | |
064af421 | 161 | * 'suffix' is a copy of 'name' following the colon and may be modified. |
f125905c | 162 | * 'dscp' is the DSCP value that the new connection should use in the IP |
ef8a3d14 | 163 | * packets it sends. |
064af421 BP |
164 | * |
165 | * Returns 0 if successful, otherwise a positive errno value. If | |
166 | * successful, stores a pointer to the new connection in '*pvconnp'. | |
167 | * | |
168 | * The listen function must not block. If the connection cannot be | |
169 | * completed immediately, it should return EAGAIN (not EINPROGRESS, as | |
170 | * returned by the connect system call) and continue the connection in the | |
171 | * background. */ | |
7a25bd99 SH |
172 | int (*listen)(const char *name, uint32_t allowed_versions, |
173 | char *suffix, struct pvconn **pvconnp, uint8_t dscp); | |
064af421 BP |
174 | |
175 | /* Closes 'pvconn' and frees associated memory. */ | |
176 | void (*close)(struct pvconn *pvconn); | |
177 | ||
178 | /* Tries to accept a new connection on 'pvconn'. If successful, stores the | |
179 | * new connection in '*new_vconnp' and returns 0. Otherwise, returns a | |
180 | * positive errno value. | |
181 | * | |
182 | * The accept function must not block waiting for a connection. If no | |
183 | * connection is ready to be accepted, it should return EAGAIN. */ | |
184 | int (*accept)(struct pvconn *pvconn, struct vconn **new_vconnp); | |
185 | ||
186 | /* Arranges for the poll loop to wake up when a connection is ready to be | |
187 | * accepted on 'pvconn'. */ | |
188 | void (*wait)(struct pvconn *pvconn); | |
189 | }; | |
190 | ||
191 | /* Active and passive vconn classes. */ | |
5b712636 BP |
192 | extern const struct vconn_class tcp_vconn_class; |
193 | extern const struct pvconn_class ptcp_pvconn_class; | |
194 | extern const struct vconn_class unix_vconn_class; | |
195 | extern const struct pvconn_class punix_pvconn_class; | |
064af421 | 196 | #ifdef HAVE_OPENSSL |
5b712636 BP |
197 | extern const struct vconn_class ssl_vconn_class; |
198 | extern const struct pvconn_class pssl_pvconn_class; | |
064af421 BP |
199 | #endif |
200 | ||
201 | #endif /* vconn-provider.h */ |