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1 | /* |
2 | * Copyright (c) 2008, 2009 Nicira Networks. | |
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 | * |
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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 | ||
23 | #include <assert.h> | |
24 | #include "vconn.h" | |
25 | \f | |
26 | /* Active virtual connection to an OpenFlow device. */ | |
27 | ||
28 | /* Active virtual connection to an OpenFlow device. | |
29 | * | |
30 | * This structure should be treated as opaque by vconn implementations. */ | |
31 | struct vconn { | |
32 | struct vconn_class *class; | |
33 | int state; | |
34 | int error; | |
35 | int min_version; | |
36 | int version; | |
37 | uint32_t ip; | |
38 | char *name; | |
39 | bool reconnectable; | |
40 | }; | |
41 | ||
42 | void vconn_init(struct vconn *, struct vconn_class *, int connect_status, | |
43 | uint32_t ip, const char *name, bool reconnectable); | |
44 | static inline void vconn_assert_class(const struct vconn *vconn, | |
45 | const struct vconn_class *class) | |
46 | { | |
47 | assert(vconn->class == class); | |
48 | } | |
49 | ||
50 | struct vconn_class { | |
51 | /* Prefix for connection names, e.g. "nl", "tcp". */ | |
52 | const char *name; | |
53 | ||
54 | /* Attempts to connect to an OpenFlow device. 'name' is the full | |
55 | * connection name provided by the user, e.g. "tcp:1.2.3.4". This name is | |
56 | * useful for error messages but must not be modified. | |
57 | * | |
58 | * 'suffix' is a copy of 'name' following the colon and may be modified. | |
59 | * | |
60 | * Returns 0 if successful, otherwise a positive errno value. If | |
61 | * successful, stores a pointer to the new connection in '*vconnp'. | |
62 | * | |
63 | * The open function must not block waiting for a connection to complete. | |
64 | * If the connection cannot be completed immediately, it should return | |
65 | * EAGAIN (not EINPROGRESS, as returned by the connect system call) and | |
66 | * continue the connection in the background. */ | |
67 | int (*open)(const char *name, char *suffix, struct vconn **vconnp); | |
68 | ||
69 | /* Closes 'vconn' and frees associated memory. */ | |
70 | void (*close)(struct vconn *vconn); | |
71 | ||
72 | /* Tries to complete the connection on 'vconn'. If 'vconn''s connection is | |
73 | * complete, returns 0 if the connection was successful or a positive errno | |
74 | * value if it failed. If the connection is still in progress, returns | |
75 | * EAGAIN. | |
76 | * | |
77 | * The connect function must not block waiting for the connection to | |
78 | * complete; instead, it should return EAGAIN immediately. */ | |
79 | int (*connect)(struct vconn *vconn); | |
80 | ||
81 | /* Tries to receive an OpenFlow message from 'vconn'. If successful, | |
82 | * stores the received message into '*msgp' and returns 0. The caller is | |
83 | * responsible for destroying the message with ofpbuf_delete(). On | |
84 | * failure, returns a positive errno value and stores a null pointer into | |
85 | * '*msgp'. | |
86 | * | |
87 | * If the connection has been closed in the normal fashion, returns EOF. | |
88 | * | |
89 | * The recv function must not block waiting for a packet to arrive. If no | |
90 | * packets have been received, it should return EAGAIN. */ | |
91 | int (*recv)(struct vconn *vconn, struct ofpbuf **msgp); | |
92 | ||
93 | /* Tries to queue 'msg' for transmission on 'vconn'. If successful, | |
94 | * returns 0, in which case ownership of 'msg' is transferred to the vconn. | |
95 | * Success does not guarantee that 'msg' has been or ever will be delivered | |
96 | * to the peer, only that it has been queued for transmission. | |
97 | * | |
98 | * Returns a positive errno value on failure, in which case the caller | |
99 | * retains ownership of 'msg'. | |
100 | * | |
101 | * The send function must not block. If 'msg' cannot be immediately | |
102 | * accepted for transmission, it should return EAGAIN. */ | |
103 | int (*send)(struct vconn *vconn, struct ofpbuf *msg); | |
104 | ||
105 | /* Arranges for the poll loop to wake up when 'vconn' is ready to take an | |
106 | * action of the given 'type'. */ | |
107 | void (*wait)(struct vconn *vconn, enum vconn_wait_type type); | |
108 | }; | |
109 | \f | |
110 | /* Passive virtual connection to an OpenFlow device. | |
111 | * | |
112 | * This structure should be treated as opaque by vconn implementations. */ | |
113 | struct pvconn { | |
114 | struct pvconn_class *class; | |
115 | char *name; | |
116 | }; | |
117 | ||
118 | void pvconn_init(struct pvconn *, struct pvconn_class *, const char *name); | |
119 | static inline void pvconn_assert_class(const struct pvconn *pvconn, | |
120 | const struct pvconn_class *class) | |
121 | { | |
122 | assert(pvconn->class == class); | |
123 | } | |
124 | ||
125 | struct pvconn_class { | |
126 | /* Prefix for connection names, e.g. "ptcp", "pssl". */ | |
127 | const char *name; | |
128 | ||
129 | /* Attempts to start listening for OpenFlow connections. 'name' is the | |
130 | * full connection name provided by the user, e.g. "ptcp:1234". This name | |
131 | * is useful for error messages but must not be modified. | |
132 | * | |
133 | * 'suffix' is a copy of 'name' following the colon and may be modified. | |
134 | * | |
135 | * Returns 0 if successful, otherwise a positive errno value. If | |
136 | * successful, stores a pointer to the new connection in '*pvconnp'. | |
137 | * | |
138 | * The listen function must not block. If the connection cannot be | |
139 | * completed immediately, it should return EAGAIN (not EINPROGRESS, as | |
140 | * returned by the connect system call) and continue the connection in the | |
141 | * background. */ | |
142 | int (*listen)(const char *name, char *suffix, struct pvconn **pvconnp); | |
143 | ||
144 | /* Closes 'pvconn' and frees associated memory. */ | |
145 | void (*close)(struct pvconn *pvconn); | |
146 | ||
147 | /* Tries to accept a new connection on 'pvconn'. If successful, stores the | |
148 | * new connection in '*new_vconnp' and returns 0. Otherwise, returns a | |
149 | * positive errno value. | |
150 | * | |
151 | * The accept function must not block waiting for a connection. If no | |
152 | * connection is ready to be accepted, it should return EAGAIN. */ | |
153 | int (*accept)(struct pvconn *pvconn, struct vconn **new_vconnp); | |
154 | ||
155 | /* Arranges for the poll loop to wake up when a connection is ready to be | |
156 | * accepted on 'pvconn'. */ | |
157 | void (*wait)(struct pvconn *pvconn); | |
158 | }; | |
159 | ||
160 | /* Active and passive vconn classes. */ | |
161 | extern struct vconn_class tcp_vconn_class; | |
162 | extern struct pvconn_class ptcp_pvconn_class; | |
163 | extern struct vconn_class unix_vconn_class; | |
164 | extern struct pvconn_class punix_pvconn_class; | |
165 | #ifdef HAVE_OPENSSL | |
166 | extern struct vconn_class ssl_vconn_class; | |
167 | extern struct pvconn_class pssl_pvconn_class; | |
168 | #endif | |
169 | ||
170 | #endif /* vconn-provider.h */ |