2 * Copyright (c) 2008, 2009, 2010 Nicira Networks.
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.
23 #include <sys/types.h>
25 #include "fatal-signal.h"
26 #include "leak-checker.h"
28 #include "openflow/openflow.h"
29 #include "poll-loop.h"
30 #include "socket-util.h"
33 #include "vconn-provider.h"
37 #define THIS_MODULE VLM_vconn_stream
39 /* Active stream socket vconn. */
44 struct stream *stream;
50 static struct vconn_class stream_vconn_class;
52 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25);
54 static void vconn_stream_clear_txbuf(struct vconn_stream *);
57 vconn_stream_new(struct stream *stream, int connect_status)
59 struct vconn_stream *s;
61 s = xmalloc(sizeof *s);
62 vconn_init(&s->vconn, &stream_vconn_class, connect_status,
63 stream_get_name(stream));
68 s->vconn.remote_ip = stream_get_remote_ip(stream);
69 s->vconn.remote_port = stream_get_remote_port(stream);
70 s->vconn.local_ip = stream_get_local_ip(stream);
71 s->vconn.local_port = stream_get_local_port(stream);
75 /* Creates a new vconn that will send and receive data on a stream named 'name'
76 * and stores a pointer to the vconn in '*vconnp'.
78 * Returns 0 if successful, otherwise a positive errno value. */
80 vconn_stream_open(const char *name, char *suffix OVS_UNUSED,
81 struct vconn **vconnp)
83 struct stream *stream;
86 error = stream_open_with_default_ports(name, OFP_TCP_PORT, OFP_SSL_PORT,
89 if (error && error != EAGAIN) {
93 *vconnp = vconn_stream_new(stream, error);
97 static struct vconn_stream *
98 vconn_stream_cast(struct vconn *vconn)
100 return CONTAINER_OF(vconn, struct vconn_stream, vconn);
104 vconn_stream_close(struct vconn *vconn)
106 struct vconn_stream *s = vconn_stream_cast(vconn);
108 if ((vconn->error == EPROTO || s->n_packets < 1) && s->rxbuf) {
109 stream_report_content(s->rxbuf->data, s->rxbuf->size, STREAM_OPENFLOW,
110 THIS_MODULE, vconn_get_name(vconn));
113 stream_close(s->stream);
114 vconn_stream_clear_txbuf(s);
115 ofpbuf_delete(s->rxbuf);
120 vconn_stream_connect(struct vconn *vconn)
122 struct vconn_stream *s = vconn_stream_cast(vconn);
123 return stream_connect(s->stream);
127 vconn_stream_recv__(struct vconn_stream *s, int rx_len)
129 struct ofpbuf *rx = s->rxbuf;
130 int want_bytes, retval;
132 want_bytes = rx_len - rx->size;
133 ofpbuf_prealloc_tailroom(rx, want_bytes);
134 retval = stream_recv(s->stream, ofpbuf_tail(rx), want_bytes);
137 return retval == want_bytes ? 0 : EAGAIN;
138 } else if (retval == 0) {
140 VLOG_ERR_RL(&rl, "connection dropped mid-packet");
150 vconn_stream_recv(struct vconn *vconn, struct ofpbuf **bufferp)
152 struct vconn_stream *s = vconn_stream_cast(vconn);
153 const struct ofp_header *oh;
156 /* Allocate new receive buffer if we don't have one. */
157 if (s->rxbuf == NULL) {
158 s->rxbuf = ofpbuf_new(1564);
161 /* Read ofp_header. */
162 if (s->rxbuf->size < sizeof(struct ofp_header)) {
163 int retval = vconn_stream_recv__(s, sizeof(struct ofp_header));
171 rx_len = ntohs(oh->length);
172 if (rx_len < sizeof(struct ofp_header)) {
173 VLOG_ERR_RL(&rl, "received too-short ofp_header (%zu bytes)",
176 } else if (s->rxbuf->size < rx_len) {
177 int retval = vconn_stream_recv__(s, rx_len);
190 vconn_stream_clear_txbuf(struct vconn_stream *s)
192 ofpbuf_delete(s->txbuf);
197 vconn_stream_send(struct vconn *vconn, struct ofpbuf *buffer)
199 struct vconn_stream *s = vconn_stream_cast(vconn);
206 retval = stream_send(s->stream, buffer->data, buffer->size);
207 if (retval == buffer->size) {
208 ofpbuf_delete(buffer);
210 } else if (retval >= 0 || retval == -EAGAIN) {
211 leak_checker_claim(buffer);
214 ofpbuf_pull(buffer, retval);
223 vconn_stream_run(struct vconn *vconn)
225 struct vconn_stream *s = vconn_stream_cast(vconn);
232 retval = stream_send(s->stream, s->txbuf->data, s->txbuf->size);
234 if (retval != -EAGAIN) {
235 VLOG_ERR_RL(&rl, "send: %s", strerror(-retval));
236 vconn_stream_clear_txbuf(s);
239 } else if (retval > 0) {
240 ofpbuf_pull(s->txbuf, retval);
241 if (!s->txbuf->size) {
242 vconn_stream_clear_txbuf(s);
249 vconn_stream_run_wait(struct vconn *vconn)
251 struct vconn_stream *s = vconn_stream_cast(vconn);
254 stream_send_wait(s->stream);
259 vconn_stream_wait(struct vconn *vconn, enum vconn_wait_type wait)
261 struct vconn_stream *s = vconn_stream_cast(vconn);
264 stream_connect_wait(s->stream);
269 stream_send_wait(s->stream);
271 /* Nothing to do: need to drain txbuf first.
272 * vconn_stream_run_wait() will arrange to wake up when there room
273 * to send data, so there's no point in calling poll_fd_wait()
274 * redundantly here. */
279 stream_recv_wait(s->stream);
287 /* Passive stream socket vconn. */
289 struct pvconn_pstream
291 struct pvconn pvconn;
292 struct pstream *pstream;
295 static struct pvconn_class pstream_pvconn_class;
297 static struct pvconn_pstream *
298 pvconn_pstream_cast(struct pvconn *pvconn)
300 return CONTAINER_OF(pvconn, struct pvconn_pstream, pvconn);
303 /* Creates a new pvconn named 'name' that will accept new connections using
304 * pstream_accept() and stores a pointer to the pvconn in '*pvconnp'.
306 * Returns 0 if successful, otherwise a positive errno value. (The current
307 * implementation never fails.) */
309 pvconn_pstream_listen(const char *name, char *suffix OVS_UNUSED,
310 struct pvconn **pvconnp)
312 struct pvconn_pstream *ps;
313 struct pstream *pstream;
316 error = pstream_open_with_default_ports(name, OFP_TCP_PORT, OFP_SSL_PORT,
322 ps = xmalloc(sizeof *ps);
323 pvconn_init(&ps->pvconn, &pstream_pvconn_class, name);
324 ps->pstream = pstream;
325 *pvconnp = &ps->pvconn;
330 pvconn_pstream_close(struct pvconn *pvconn)
332 struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
333 pstream_close(ps->pstream);
338 pvconn_pstream_accept(struct pvconn *pvconn, struct vconn **new_vconnp)
340 struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
341 struct stream *stream;
344 error = pstream_accept(ps->pstream, &stream);
346 if (error != EAGAIN) {
347 VLOG_DBG_RL(&rl, "%s: accept: %s",
348 pstream_get_name(ps->pstream), strerror(error));
353 *new_vconnp = vconn_stream_new(stream, 0);
358 pvconn_pstream_wait(struct pvconn *pvconn)
360 struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
361 pstream_wait(ps->pstream);
364 /* Stream-based vconns and pvconns. */
366 #define DEFINE_VCONN_STREAM_CLASS(NAME) \
367 struct vconn_class NAME##_vconn_class = { \
370 vconn_stream_close, \
371 vconn_stream_connect, \
375 vconn_stream_run_wait, \
379 #define DEFINE_PVCONN_STREAM_CLASS(NAME) \
380 struct pvconn_class NAME##_pvconn_class = { \
382 pvconn_pstream_listen, \
383 pvconn_pstream_close, \
384 pvconn_pstream_accept, \
385 pvconn_pstream_wait \
388 static DEFINE_VCONN_STREAM_CLASS(stream);
389 static DEFINE_PVCONN_STREAM_CLASS(pstream);
391 DEFINE_VCONN_STREAM_CLASS(tcp);
392 DEFINE_PVCONN_STREAM_CLASS(ptcp);
394 DEFINE_VCONN_STREAM_CLASS(unix);
395 DEFINE_PVCONN_STREAM_CLASS(punix);
398 DEFINE_VCONN_STREAM_CLASS(ssl);
399 DEFINE_PVCONN_STREAM_CLASS(pssl);