2 * Copyright (c) 2008, 2009, 2010, 2011 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.
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 VLOG_DEFINE_THIS_MODULE(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, uint8_t dscp)
83 struct stream *stream;
86 error = stream_open_with_default_ports(name, OFP_TCP_PORT, OFP_SSL_PORT,
89 error = stream_connect(stream);
90 if (!error || error == EAGAIN) {
91 *vconnp = vconn_stream_new(stream, error);
100 static struct vconn_stream *
101 vconn_stream_cast(struct vconn *vconn)
103 return CONTAINER_OF(vconn, struct vconn_stream, vconn);
107 vconn_stream_close(struct vconn *vconn)
109 struct vconn_stream *s = vconn_stream_cast(vconn);
111 if ((vconn->error == EPROTO || s->n_packets < 1) && s->rxbuf) {
112 stream_report_content(s->rxbuf->data, s->rxbuf->size, STREAM_OPENFLOW,
113 THIS_MODULE, vconn_get_name(vconn));
116 stream_close(s->stream);
117 vconn_stream_clear_txbuf(s);
118 ofpbuf_delete(s->rxbuf);
123 vconn_stream_connect(struct vconn *vconn)
125 struct vconn_stream *s = vconn_stream_cast(vconn);
126 return stream_connect(s->stream);
130 vconn_stream_recv__(struct vconn_stream *s, int rx_len)
132 struct ofpbuf *rx = s->rxbuf;
133 int want_bytes, retval;
135 want_bytes = rx_len - rx->size;
136 ofpbuf_prealloc_tailroom(rx, want_bytes);
137 retval = stream_recv(s->stream, ofpbuf_tail(rx), want_bytes);
140 return retval == want_bytes ? 0 : EAGAIN;
141 } else if (retval == 0) {
143 VLOG_ERR_RL(&rl, "connection dropped mid-packet");
153 vconn_stream_recv(struct vconn *vconn, struct ofpbuf **bufferp)
155 struct vconn_stream *s = vconn_stream_cast(vconn);
156 const struct ofp_header *oh;
159 /* Allocate new receive buffer if we don't have one. */
160 if (s->rxbuf == NULL) {
161 s->rxbuf = ofpbuf_new(1564);
164 /* Read ofp_header. */
165 if (s->rxbuf->size < sizeof(struct ofp_header)) {
166 int retval = vconn_stream_recv__(s, sizeof(struct ofp_header));
174 rx_len = ntohs(oh->length);
175 if (rx_len < sizeof(struct ofp_header)) {
176 VLOG_ERR_RL(&rl, "received too-short ofp_header (%d bytes)", rx_len);
178 } else if (s->rxbuf->size < rx_len) {
179 int retval = vconn_stream_recv__(s, rx_len);
192 vconn_stream_clear_txbuf(struct vconn_stream *s)
194 ofpbuf_delete(s->txbuf);
199 vconn_stream_send(struct vconn *vconn, struct ofpbuf *buffer)
201 struct vconn_stream *s = vconn_stream_cast(vconn);
208 retval = stream_send(s->stream, buffer->data, buffer->size);
209 if (retval == buffer->size) {
210 ofpbuf_delete(buffer);
212 } else if (retval >= 0 || retval == -EAGAIN) {
213 leak_checker_claim(buffer);
216 ofpbuf_pull(buffer, retval);
225 vconn_stream_run(struct vconn *vconn)
227 struct vconn_stream *s = vconn_stream_cast(vconn);
230 stream_run(s->stream);
235 retval = stream_send(s->stream, s->txbuf->data, s->txbuf->size);
237 if (retval != -EAGAIN) {
238 VLOG_ERR_RL(&rl, "send: %s", strerror(-retval));
239 vconn_stream_clear_txbuf(s);
242 } else if (retval > 0) {
243 ofpbuf_pull(s->txbuf, retval);
244 if (!s->txbuf->size) {
245 vconn_stream_clear_txbuf(s);
252 vconn_stream_run_wait(struct vconn *vconn)
254 struct vconn_stream *s = vconn_stream_cast(vconn);
256 stream_run_wait(s->stream);
258 stream_send_wait(s->stream);
263 vconn_stream_wait(struct vconn *vconn, enum vconn_wait_type wait)
265 struct vconn_stream *s = vconn_stream_cast(vconn);
268 stream_connect_wait(s->stream);
273 stream_send_wait(s->stream);
275 /* Nothing to do: need to drain txbuf first.
276 * vconn_stream_run_wait() will arrange to wake up when there room
277 * to send data, so there's no point in calling poll_fd_wait()
278 * redundantly here. */
283 stream_recv_wait(s->stream);
291 /* Passive stream socket vconn. */
293 struct pvconn_pstream
295 struct pvconn pvconn;
296 struct pstream *pstream;
299 static struct pvconn_class pstream_pvconn_class;
301 static struct pvconn_pstream *
302 pvconn_pstream_cast(struct pvconn *pvconn)
304 return CONTAINER_OF(pvconn, struct pvconn_pstream, pvconn);
307 /* Creates a new pvconn named 'name' that will accept new connections using
308 * pstream_accept() and stores a pointer to the pvconn in '*pvconnp'.
310 * Returns 0 if successful, otherwise a positive errno value. (The current
311 * implementation never fails.) */
313 pvconn_pstream_listen(const char *name, char *suffix OVS_UNUSED,
314 struct pvconn **pvconnp, uint8_t dscp)
316 struct pvconn_pstream *ps;
317 struct pstream *pstream;
320 error = pstream_open_with_default_ports(name, OFP_TCP_PORT, OFP_SSL_PORT,
326 ps = xmalloc(sizeof *ps);
327 pvconn_init(&ps->pvconn, &pstream_pvconn_class, name);
328 ps->pstream = pstream;
329 *pvconnp = &ps->pvconn;
334 pvconn_pstream_close(struct pvconn *pvconn)
336 struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
337 pstream_close(ps->pstream);
342 pvconn_pstream_accept(struct pvconn *pvconn, struct vconn **new_vconnp)
344 struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
345 struct stream *stream;
348 error = pstream_accept(ps->pstream, &stream);
350 if (error != EAGAIN) {
351 VLOG_DBG_RL(&rl, "%s: accept: %s",
352 pstream_get_name(ps->pstream), strerror(error));
357 *new_vconnp = vconn_stream_new(stream, 0);
362 pvconn_pstream_wait(struct pvconn *pvconn)
364 struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
365 pstream_wait(ps->pstream);
368 /* Stream-based vconns and pvconns. */
370 #define STREAM_INIT(NAME) \
374 vconn_stream_close, \
375 vconn_stream_connect, \
379 vconn_stream_run_wait, \
383 #define PSTREAM_INIT(NAME) \
386 pvconn_pstream_listen, \
387 pvconn_pstream_close, \
388 pvconn_pstream_accept, \
389 pvconn_pstream_wait \
392 static struct vconn_class stream_vconn_class = STREAM_INIT("stream");
393 static struct pvconn_class pstream_pvconn_class = PSTREAM_INIT("pstream");
395 struct vconn_class tcp_vconn_class = STREAM_INIT("tcp");
396 struct pvconn_class ptcp_pvconn_class = PSTREAM_INIT("ptcp");
398 struct vconn_class unix_vconn_class = STREAM_INIT("unix");
399 struct pvconn_class punix_pvconn_class = PSTREAM_INIT("punix");
402 struct vconn_class ssl_vconn_class = STREAM_INIT("ssl");
403 struct pvconn_class pssl_pvconn_class = PSTREAM_INIT("pssl");