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
10 * charge, to any person obtaining a copy of this Software to deal in
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>
44 #include "openflow/openflow.h"
45 #include "poll-loop.h"
46 #include "socket-util.h"
48 #include "vconn-provider.h"
52 #define THIS_MODULE VLM_vconn_stream
54 /* Active stream socket vconn. */
62 struct poll_waiter *tx_waiter;
65 static struct vconn_class stream_vconn_class;
67 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25);
69 static void stream_clear_txbuf(struct stream_vconn *);
72 new_stream_vconn(const char *name, int fd, int connect_status,
73 uint32_t ip, struct vconn **vconnp)
75 struct stream_vconn *s;
77 s = xmalloc(sizeof *s);
78 vconn_init(&s->vconn, &stream_vconn_class, connect_status, ip, name);
87 static struct stream_vconn *
88 stream_vconn_cast(struct vconn *vconn)
90 vconn_assert_class(vconn, &stream_vconn_class);
91 return CONTAINER_OF(vconn, struct stream_vconn, vconn);
95 stream_close(struct vconn *vconn)
97 struct stream_vconn *s = stream_vconn_cast(vconn);
98 poll_cancel(s->tx_waiter);
99 stream_clear_txbuf(s);
100 ofpbuf_delete(s->rxbuf);
106 stream_connect(struct vconn *vconn)
108 struct stream_vconn *s = stream_vconn_cast(vconn);
109 return check_connection_completion(s->fd);
113 stream_recv(struct vconn *vconn, struct ofpbuf **bufferp)
115 struct stream_vconn *s = stream_vconn_cast(vconn);
120 if (s->rxbuf == NULL) {
121 s->rxbuf = ofpbuf_new(1564);
126 if (sizeof(struct ofp_header) > rx->size) {
127 want_bytes = sizeof(struct ofp_header) - rx->size;
129 struct ofp_header *oh = rx->data;
130 size_t length = ntohs(oh->length);
131 if (length < sizeof(struct ofp_header)) {
132 VLOG_ERR_RL(&rl, "received too-short ofp_header (%zu bytes)",
136 want_bytes = length - rx->size;
143 ofpbuf_prealloc_tailroom(rx, want_bytes);
145 retval = read(s->fd, ofpbuf_tail(rx), want_bytes);
148 if (retval == want_bytes) {
149 if (rx->size > sizeof(struct ofp_header)) {
158 } else if (retval == 0) {
160 VLOG_ERR_RL(&rl, "connection dropped mid-packet");
171 stream_clear_txbuf(struct stream_vconn *s)
173 ofpbuf_delete(s->txbuf);
179 stream_do_tx(int fd UNUSED, short int revents UNUSED, void *vconn_)
181 struct vconn *vconn = vconn_;
182 struct stream_vconn *s = stream_vconn_cast(vconn);
183 ssize_t n = write(s->fd, s->txbuf->data, s->txbuf->size);
185 if (errno != EAGAIN) {
186 VLOG_ERR_RL(&rl, "send: %s", strerror(errno));
187 stream_clear_txbuf(s);
191 ofpbuf_pull(s->txbuf, n);
192 if (!s->txbuf->size) {
193 stream_clear_txbuf(s);
197 s->tx_waiter = poll_fd_callback(s->fd, POLLOUT, stream_do_tx, vconn);
201 stream_send(struct vconn *vconn, struct ofpbuf *buffer)
203 struct stream_vconn *s = stream_vconn_cast(vconn);
210 retval = write(s->fd, buffer->data, buffer->size);
211 if (retval == buffer->size) {
212 ofpbuf_delete(buffer);
214 } else if (retval >= 0 || errno == EAGAIN) {
217 ofpbuf_pull(buffer, retval);
219 s->tx_waiter = poll_fd_callback(s->fd, POLLOUT, stream_do_tx, vconn);
227 stream_wait(struct vconn *vconn, enum vconn_wait_type wait)
229 struct stream_vconn *s = stream_vconn_cast(vconn);
232 poll_fd_wait(s->fd, POLLOUT);
237 poll_fd_wait(s->fd, POLLOUT);
239 /* Nothing to do: need to drain txbuf first. */
244 poll_fd_wait(s->fd, POLLIN);
252 static struct vconn_class stream_vconn_class = {
255 stream_close, /* close */
256 stream_connect, /* connect */
257 stream_recv, /* recv */
258 stream_send, /* send */
259 stream_wait, /* wait */
262 /* Passive stream socket vconn. */
264 struct pstream_pvconn
266 struct pvconn pvconn;
268 int (*accept_cb)(int fd, const struct sockaddr *, size_t sa_len,
272 static struct pvconn_class pstream_pvconn_class;
274 static struct pstream_pvconn *
275 pstream_pvconn_cast(struct pvconn *pvconn)
277 pvconn_assert_class(pvconn, &pstream_pvconn_class);
278 return CONTAINER_OF(pvconn, struct pstream_pvconn, pvconn);
282 new_pstream_pvconn(const char *name, int fd,
283 int (*accept_cb)(int fd, const struct sockaddr *,
284 size_t sa_len, struct vconn **),
285 struct pvconn **pvconnp)
287 struct pstream_pvconn *ps;
290 retval = set_nonblocking(fd);
296 if (listen(fd, 10) < 0) {
298 VLOG_ERR("%s: listen: %s", name, strerror(error));
303 ps = xmalloc(sizeof *ps);
304 pvconn_init(&ps->pvconn, &pstream_pvconn_class, name);
306 ps->accept_cb = accept_cb;
307 *pvconnp = &ps->pvconn;
312 pstream_close(struct pvconn *pvconn)
314 struct pstream_pvconn *ps = pstream_pvconn_cast(pvconn);
320 pstream_accept(struct pvconn *pvconn, struct vconn **new_vconnp)
322 struct pstream_pvconn *ps = pstream_pvconn_cast(pvconn);
323 struct sockaddr_storage ss;
324 socklen_t ss_len = sizeof ss;
328 new_fd = accept(ps->fd, (struct sockaddr *) &ss, &ss_len);
331 if (retval != EAGAIN) {
332 VLOG_DBG_RL(&rl, "accept: %s", strerror(retval));
337 retval = set_nonblocking(new_fd);
343 return ps->accept_cb(new_fd, (const struct sockaddr *) &ss, ss_len,
348 pstream_wait(struct pvconn *pvconn)
350 struct pstream_pvconn *ps = pstream_pvconn_cast(pvconn);
351 poll_fd_wait(ps->fd, POLLIN);
354 static struct pvconn_class pstream_pvconn_class = {