1 /* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
4 * We are making the OpenFlow specification and associated documentation
5 * (Software) available for public use and benefit with the expectation
6 * that others will use, modify and enhance the Software and contribute
7 * those enhancements back to the community. However, since we would
8 * like to make the Software available for broadest use, with as few
9 * restrictions as possible permission is hereby granted, free of
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11 * the Software under the copyrights without restriction, including
12 * without limitation the rights to use, copy, modify, merge, publish,
13 * distribute, sublicense, and/or sell copies of the Software, and to
14 * permit persons to whom the Software is furnished to do so, subject to
15 * the following conditions:
17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
24 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
25 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
26 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 * The name and trademarks of copyright holder(s) may NOT be used in
30 * advertising or publicity pertaining to the Software or any
31 * derivatives without specific, written prior permission.
35 #include "vconn-stream.h"
41 #include <sys/types.h>
46 #include "poll-loop.h"
47 #include "socket-util.h"
51 #define THIS_MODULE VLM_vconn_stream
53 /* Active stream socket vconn. */
61 struct poll_waiter *tx_waiter;
64 static struct vconn_class stream_vconn_class;
66 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25);
69 new_stream_vconn(const char *name, int fd, int connect_status,
70 uint32_t ip, struct vconn **vconnp)
72 struct stream_vconn *s;
74 s = xmalloc(sizeof *s);
75 s->vconn.class = &stream_vconn_class;
76 s->vconn.connect_status = connect_status;
86 static struct stream_vconn *
87 stream_vconn_cast(struct vconn *vconn)
89 assert(vconn->class == &stream_vconn_class);
90 return CONTAINER_OF(vconn, struct stream_vconn, vconn);
94 stream_close(struct vconn *vconn)
96 struct stream_vconn *s = stream_vconn_cast(vconn);
97 poll_cancel(s->tx_waiter);
103 stream_connect(struct vconn *vconn)
105 struct stream_vconn *s = stream_vconn_cast(vconn);
106 return check_connection_completion(s->fd);
110 stream_recv(struct vconn *vconn, struct buffer **bufferp)
112 struct stream_vconn *s = stream_vconn_cast(vconn);
117 if (s->rxbuf == NULL) {
118 s->rxbuf = buffer_new(1564);
123 if (sizeof(struct ofp_header) > rx->size) {
124 want_bytes = sizeof(struct ofp_header) - rx->size;
126 struct ofp_header *oh = rx->data;
127 size_t length = ntohs(oh->length);
128 if (length < sizeof(struct ofp_header)) {
129 VLOG_ERR_RL(&rl, "received too-short ofp_header (%zu bytes)",
133 want_bytes = length - rx->size;
140 buffer_prealloc_tailroom(rx, want_bytes);
142 retval = read(s->fd, buffer_tail(rx), want_bytes);
145 if (retval == want_bytes) {
146 if (rx->size > sizeof(struct ofp_header)) {
155 } else if (retval == 0) {
157 VLOG_ERR_RL(&rl, "connection dropped mid-packet");
163 return retval ? errno : EAGAIN;
168 stream_clear_txbuf(struct stream_vconn *s)
170 buffer_delete(s->txbuf);
176 stream_do_tx(int fd UNUSED, short int revents UNUSED, void *vconn_)
178 struct vconn *vconn = vconn_;
179 struct stream_vconn *s = stream_vconn_cast(vconn);
180 ssize_t n = write(s->fd, s->txbuf->data, s->txbuf->size);
182 if (errno != EAGAIN) {
183 VLOG_ERR_RL(&rl, "send: %s", strerror(errno));
184 stream_clear_txbuf(s);
188 buffer_pull(s->txbuf, n);
189 if (!s->txbuf->size) {
190 stream_clear_txbuf(s);
194 s->tx_waiter = poll_fd_callback(s->fd, POLLOUT, stream_do_tx, vconn);
198 stream_send(struct vconn *vconn, struct buffer *buffer)
200 struct stream_vconn *s = stream_vconn_cast(vconn);
207 retval = write(s->fd, buffer->data, buffer->size);
208 if (retval == buffer->size) {
209 buffer_delete(buffer);
211 } else if (retval >= 0 || errno == EAGAIN) {
214 buffer_pull(buffer, retval);
216 s->tx_waiter = poll_fd_callback(s->fd, POLLOUT, stream_do_tx, vconn);
224 stream_wait(struct vconn *vconn, enum vconn_wait_type wait)
226 struct stream_vconn *s = stream_vconn_cast(vconn);
229 poll_fd_wait(s->fd, POLLOUT);
234 poll_fd_wait(s->fd, POLLOUT);
236 /* Nothing to do: need to drain txbuf first. */
241 poll_fd_wait(s->fd, POLLIN);
249 static struct vconn_class stream_vconn_class = {
251 .close = stream_close,
252 .connect = stream_connect,
258 /* Passive stream socket vconn. */
264 int (*accept_cb)(int fd, const struct sockaddr *, size_t sa_len,
268 static struct vconn_class pstream_vconn_class;
270 static struct pstream_vconn *
271 pstream_vconn_cast(struct vconn *vconn)
273 assert(vconn->class == &pstream_vconn_class);
274 return CONTAINER_OF(vconn, struct pstream_vconn, vconn);
278 new_pstream_vconn(const char *name, int fd,
279 int (*accept_cb)(int fd, const struct sockaddr *,
280 size_t sa_len, struct vconn **),
281 struct vconn **vconnp)
283 struct pstream_vconn *ps;
286 retval = set_nonblocking(fd);
292 if (listen(fd, 10) < 0) {
294 VLOG_ERR("%s: listen: %s", name, strerror(error));
299 ps = xmalloc(sizeof *ps);
300 ps->vconn.class = &pstream_vconn_class;
301 ps->vconn.connect_status = 0;
303 ps->accept_cb = accept_cb;
304 *vconnp = &ps->vconn;
309 pstream_close(struct vconn *vconn)
311 struct pstream_vconn *ps = pstream_vconn_cast(vconn);
317 pstream_accept(struct vconn *vconn, struct vconn **new_vconnp)
319 struct pstream_vconn *ps = pstream_vconn_cast(vconn);
320 struct sockaddr_storage ss;
321 socklen_t ss_len = sizeof ss;
325 new_fd = accept(ps->fd, (struct sockaddr *) &ss, &ss_len);
328 if (retval != EAGAIN) {
329 VLOG_DBG_RL(&rl, "accept: %s", strerror(retval));
334 retval = set_nonblocking(new_fd);
340 return ps->accept_cb(new_fd, (const struct sockaddr *) &ss, ss_len,
345 pstream_wait(struct vconn *vconn, enum vconn_wait_type wait)
347 struct pstream_vconn *ps = pstream_vconn_cast(vconn);
348 assert(wait == WAIT_ACCEPT);
349 poll_fd_wait(ps->fd, POLLIN);
352 static struct vconn_class pstream_vconn_class = {
354 .close = pstream_close,
355 .accept = pstream_accept,