2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2016 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.
22 #include <sys/types.h>
24 #include "fatal-signal.h"
25 #include "openvswitch/ofpbuf.h"
26 #include "openflow/openflow.h"
27 #include "openvswitch/poll-loop.h"
28 #include "socket-util.h"
31 #include "vconn-provider.h"
32 #include "openvswitch/vconn.h"
33 #include "openvswitch/vlog.h"
35 VLOG_DEFINE_THIS_MODULE(vconn_stream
);
37 /* Active stream socket vconn. */
42 struct stream
*stream
;
48 static const struct vconn_class stream_vconn_class
;
50 static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(10, 25);
52 static void vconn_stream_clear_txbuf(struct vconn_stream
*);
55 vconn_stream_new(struct stream
*stream
, int connect_status
,
56 uint32_t allowed_versions
)
58 struct vconn_stream
*s
;
60 s
= xmalloc(sizeof *s
);
61 vconn_init(&s
->vconn
, &stream_vconn_class
, connect_status
,
62 stream_get_name(stream
), allowed_versions
);
70 /* Creates a new vconn that will send and receive data on a stream named 'name'
71 * and stores a pointer to the vconn in '*vconnp'.
73 * Returns 0 if successful, otherwise a positive errno value. */
75 vconn_stream_open(const char *name
, uint32_t allowed_versions
,
76 char *suffix OVS_UNUSED
, struct vconn
**vconnp
, uint8_t dscp
)
78 struct stream
*stream
;
81 error
= stream_open_with_default_port(name
, OFP_PORT
, &stream
, dscp
);
83 error
= stream_connect(stream
);
84 if (!error
|| error
== EAGAIN
) {
85 *vconnp
= vconn_stream_new(stream
, error
, allowed_versions
);
94 static struct vconn_stream
*
95 vconn_stream_cast(struct vconn
*vconn
)
97 return CONTAINER_OF(vconn
, struct vconn_stream
, vconn
);
101 vconn_stream_close(struct vconn
*vconn
)
103 struct vconn_stream
*s
= vconn_stream_cast(vconn
);
105 if ((vconn
->error
== EPROTO
|| s
->n_packets
< 1) && s
->rxbuf
) {
106 stream_report_content(s
->rxbuf
->data
, s
->rxbuf
->size
, STREAM_OPENFLOW
,
107 &this_module
, vconn_get_name(vconn
));
110 stream_close(s
->stream
);
111 vconn_stream_clear_txbuf(s
);
112 ofpbuf_delete(s
->rxbuf
);
117 vconn_stream_connect(struct vconn
*vconn
)
119 struct vconn_stream
*s
= vconn_stream_cast(vconn
);
120 return stream_connect(s
->stream
);
124 vconn_stream_recv__(struct vconn_stream
*s
, int rx_len
)
126 struct ofpbuf
*rx
= s
->rxbuf
;
127 int want_bytes
, retval
;
129 want_bytes
= rx_len
- rx
->size
;
130 ofpbuf_prealloc_tailroom(rx
, want_bytes
);
131 retval
= stream_recv(s
->stream
, ofpbuf_tail(rx
), want_bytes
);
134 return retval
== want_bytes
? 0 : EAGAIN
;
135 } else if (retval
== 0) {
137 VLOG_ERR_RL(&rl
, "connection dropped mid-packet");
147 vconn_stream_recv(struct vconn
*vconn
, struct ofpbuf
**bufferp
)
149 struct vconn_stream
*s
= vconn_stream_cast(vconn
);
150 const struct ofp_header
*oh
;
153 /* Allocate new receive buffer if we don't have one. */
154 if (s
->rxbuf
== NULL
) {
155 s
->rxbuf
= ofpbuf_new(1564);
158 /* Read ofp_header. */
159 if (s
->rxbuf
->size
< sizeof(struct ofp_header
)) {
160 int retval
= vconn_stream_recv__(s
, sizeof(struct ofp_header
));
168 rx_len
= ntohs(oh
->length
);
169 if (rx_len
< sizeof(struct ofp_header
)) {
170 VLOG_ERR_RL(&rl
, "received too-short ofp_header (%d bytes)", rx_len
);
172 } else if (s
->rxbuf
->size
< rx_len
) {
173 int retval
= vconn_stream_recv__(s
, rx_len
);
186 vconn_stream_clear_txbuf(struct vconn_stream
*s
)
188 ofpbuf_delete(s
->txbuf
);
193 vconn_stream_send(struct vconn
*vconn
, struct ofpbuf
*buffer
)
195 struct vconn_stream
*s
= vconn_stream_cast(vconn
);
202 retval
= stream_send(s
->stream
, buffer
->data
, buffer
->size
);
203 if (retval
== buffer
->size
) {
204 ofpbuf_delete(buffer
);
206 } else if (retval
>= 0 || retval
== -EAGAIN
) {
209 ofpbuf_pull(buffer
, retval
);
218 vconn_stream_run(struct vconn
*vconn
)
220 struct vconn_stream
*s
= vconn_stream_cast(vconn
);
223 stream_run(s
->stream
);
228 retval
= stream_send(s
->stream
, s
->txbuf
->data
, s
->txbuf
->size
);
230 if (retval
!= -EAGAIN
) {
231 VLOG_ERR_RL(&rl
, "send: %s", ovs_strerror(-retval
));
232 vconn_stream_clear_txbuf(s
);
235 } else if (retval
> 0) {
236 ofpbuf_pull(s
->txbuf
, retval
);
237 if (!s
->txbuf
->size
) {
238 vconn_stream_clear_txbuf(s
);
245 vconn_stream_run_wait(struct vconn
*vconn
)
247 struct vconn_stream
*s
= vconn_stream_cast(vconn
);
249 stream_run_wait(s
->stream
);
251 stream_send_wait(s
->stream
);
256 vconn_stream_wait(struct vconn
*vconn
, enum vconn_wait_type wait
)
258 struct vconn_stream
*s
= vconn_stream_cast(vconn
);
261 stream_connect_wait(s
->stream
);
266 stream_send_wait(s
->stream
);
268 /* Nothing to do: need to drain txbuf first.
269 * vconn_stream_run_wait() will arrange to wake up when there room
270 * to send data, so there's no point in calling poll_fd_wait()
271 * redundantly here. */
276 stream_recv_wait(s
->stream
);
284 /* Passive stream socket vconn. */
286 struct pvconn_pstream
288 struct pvconn pvconn
;
289 struct pstream
*pstream
;
292 static const struct pvconn_class pstream_pvconn_class
;
294 static struct pvconn_pstream
*
295 pvconn_pstream_cast(struct pvconn
*pvconn
)
297 return CONTAINER_OF(pvconn
, struct pvconn_pstream
, pvconn
);
300 /* Creates a new pvconn named 'name' that will accept new connections using
301 * pstream_accept() and stores a pointer to the pvconn in '*pvconnp'.
303 * Returns 0 if successful, otherwise a positive errno value. (The current
304 * implementation never fails.) */
306 pvconn_pstream_listen(const char *name
, uint32_t allowed_versions
,
307 char *suffix OVS_UNUSED
, struct pvconn
**pvconnp
,
310 struct pvconn_pstream
*ps
;
311 struct pstream
*pstream
;
314 error
= pstream_open_with_default_port(name
, OFP_PORT
, &pstream
, dscp
);
319 ps
= xmalloc(sizeof *ps
);
320 pvconn_init(&ps
->pvconn
, &pstream_pvconn_class
, name
, allowed_versions
);
321 ps
->pstream
= pstream
;
322 *pvconnp
= &ps
->pvconn
;
327 pvconn_pstream_close(struct pvconn
*pvconn
)
329 struct pvconn_pstream
*ps
= pvconn_pstream_cast(pvconn
);
330 pstream_close(ps
->pstream
);
335 pvconn_pstream_accept(struct pvconn
*pvconn
, struct vconn
**new_vconnp
)
337 struct pvconn_pstream
*ps
= pvconn_pstream_cast(pvconn
);
338 struct stream
*stream
;
341 error
= pstream_accept(ps
->pstream
, &stream
);
343 if (error
!= EAGAIN
) {
344 VLOG_DBG_RL(&rl
, "%s: accept: %s",
345 pstream_get_name(ps
->pstream
), ovs_strerror(error
));
350 *new_vconnp
= vconn_stream_new(stream
, 0, pvconn
->allowed_versions
);
355 pvconn_pstream_wait(struct pvconn
*pvconn
)
357 struct pvconn_pstream
*ps
= pvconn_pstream_cast(pvconn
);
358 pstream_wait(ps
->pstream
);
361 /* Stream-based vconns and pvconns. */
363 #define STREAM_INIT(NAME) \
367 vconn_stream_close, \
368 vconn_stream_connect, \
372 vconn_stream_run_wait, \
376 #define PSTREAM_INIT(NAME) \
379 pvconn_pstream_listen, \
380 pvconn_pstream_close, \
381 pvconn_pstream_accept, \
382 pvconn_pstream_wait \
385 static const struct vconn_class stream_vconn_class
= STREAM_INIT("stream");
386 static const struct pvconn_class pstream_pvconn_class
= PSTREAM_INIT("pstream");
388 const struct vconn_class tcp_vconn_class
= STREAM_INIT("tcp");
389 const struct pvconn_class ptcp_pvconn_class
= PSTREAM_INIT("ptcp");
391 const struct vconn_class unix_vconn_class
= STREAM_INIT("unix");
392 const struct pvconn_class punix_pvconn_class
= PSTREAM_INIT("punix");
395 const struct vconn_class ssl_vconn_class
= STREAM_INIT("ssl");
396 const struct pvconn_class pssl_pvconn_class
= PSTREAM_INIT("pssl");