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.
41 #include <sys/types.h>
42 #include <netinet/in.h>
43 #include <netinet/tcp.h>
48 #include "socket-util.h"
51 #include "ofp-print.h"
53 #include "poll-loop.h"
56 #define THIS_MODULE VLM_vconn_tcp
66 struct poll_waiter *tx_waiter;
70 new_tcp_vconn(const char *name, int fd, int connect_status,
71 const struct sockaddr_in *sin, struct vconn **vconnp)
73 struct tcp_vconn *tcp;
77 retval = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
79 VLOG_ERR("%s: setsockopt(TCP_NODELAY): %s", name, strerror(errno));
84 tcp = xmalloc(sizeof *tcp);
85 tcp->vconn.class = &tcp_vconn_class;
86 tcp->vconn.connect_status = connect_status;
87 tcp->vconn.ip = sin->sin_addr.s_addr;
90 tcp->tx_waiter = NULL;
92 *vconnp = &tcp->vconn;
96 static struct tcp_vconn *
97 tcp_vconn_cast(struct vconn *vconn)
99 assert(vconn->class == &tcp_vconn_class);
100 return CONTAINER_OF(vconn, struct tcp_vconn, vconn);
105 tcp_open(const char *name, char *suffix, struct vconn **vconnp)
108 const char *host_name;
109 const char *port_string;
110 struct sockaddr_in sin;
114 /* Glibc 2.7 has a bug in strtok_r when compiling with optimization that
115 * can cause segfaults here:
116 * http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
117 * Using "::" instead of the obvious ":" works around it. */
118 host_name = strtok_r(suffix, "::", &save_ptr);
119 port_string = strtok_r(NULL, "::", &save_ptr);
121 error(0, "%s: bad peer name format", name);
125 memset(&sin, 0, sizeof sin);
126 sin.sin_family = AF_INET;
127 if (lookup_ip(host_name, &sin.sin_addr)) {
130 sin.sin_port = htons(port_string ? atoi(port_string) : OFP_TCP_PORT);
132 fd = socket(AF_INET, SOCK_STREAM, 0);
134 VLOG_ERR("%s: socket: %s", name, strerror(errno));
138 retval = set_nonblocking(fd);
144 retval = connect(fd, (struct sockaddr *) &sin, sizeof sin);
146 if (errno == EINPROGRESS) {
147 return new_tcp_vconn(name, fd, EAGAIN, &sin, vconnp);
150 VLOG_ERR("%s: connect: %s", name, strerror(error));
155 return new_tcp_vconn(name, fd, 0, &sin, vconnp);
160 tcp_close(struct vconn *vconn)
162 struct tcp_vconn *tcp = tcp_vconn_cast(vconn);
163 poll_cancel(tcp->tx_waiter);
169 tcp_connect(struct vconn *vconn)
171 struct tcp_vconn *tcp = tcp_vconn_cast(vconn);
172 return check_connection_completion(tcp->fd);
176 tcp_recv(struct vconn *vconn, struct buffer **bufferp)
178 struct tcp_vconn *tcp = tcp_vconn_cast(vconn);
183 if (tcp->rxbuf == NULL) {
184 tcp->rxbuf = buffer_new(1564);
189 if (sizeof(struct ofp_header) > rx->size) {
190 want_bytes = sizeof(struct ofp_header) - rx->size;
192 struct ofp_header *oh = rx->data;
193 size_t length = ntohs(oh->length);
194 if (length < sizeof(struct ofp_header)) {
195 VLOG_ERR("received too-short ofp_header (%zu bytes)", length);
198 want_bytes = length - rx->size;
205 buffer_prealloc_tailroom(rx, want_bytes);
207 retval = read(tcp->fd, buffer_tail(rx), want_bytes);
210 if (retval == want_bytes) {
211 if (rx->size > sizeof(struct ofp_header)) {
220 } else if (retval == 0) {
222 VLOG_ERR("connection dropped mid-packet");
228 return retval ? errno : EAGAIN;
233 tcp_clear_txbuf(struct tcp_vconn *tcp)
235 buffer_delete(tcp->txbuf);
237 tcp->tx_waiter = NULL;
241 tcp_do_tx(int fd UNUSED, short int revents UNUSED, void *vconn_)
243 struct vconn *vconn = vconn_;
244 struct tcp_vconn *tcp = tcp_vconn_cast(vconn);
245 ssize_t n = write(tcp->fd, tcp->txbuf->data, tcp->txbuf->size);
247 if (errno != EAGAIN) {
248 VLOG_ERR("send: %s", strerror(errno));
249 tcp_clear_txbuf(tcp);
253 buffer_pull(tcp->txbuf, n);
254 if (!tcp->txbuf->size) {
255 tcp_clear_txbuf(tcp);
259 tcp->tx_waiter = poll_fd_callback(tcp->fd, POLLOUT, tcp_do_tx, vconn);
263 tcp_send(struct vconn *vconn, struct buffer *buffer)
265 struct tcp_vconn *tcp = tcp_vconn_cast(vconn);
272 retval = write(tcp->fd, buffer->data, buffer->size);
273 if (retval == buffer->size) {
274 buffer_delete(buffer);
276 } else if (retval >= 0 || errno == EAGAIN) {
279 buffer_pull(buffer, retval);
281 tcp->tx_waiter = poll_fd_callback(tcp->fd, POLLOUT, tcp_do_tx, vconn);
289 tcp_wait(struct vconn *vconn, enum vconn_wait_type wait)
291 struct tcp_vconn *tcp = tcp_vconn_cast(vconn);
294 poll_fd_wait(tcp->fd, POLLOUT);
299 poll_fd_wait(tcp->fd, POLLOUT);
301 /* Nothing to do: need to drain txbuf first. */
306 poll_fd_wait(tcp->fd, POLLIN);
314 struct vconn_class tcp_vconn_class = {
318 .connect = tcp_connect,
332 static struct ptcp_vconn *
333 ptcp_vconn_cast(struct vconn *vconn)
335 assert(vconn->class == &ptcp_vconn_class);
336 return CONTAINER_OF(vconn, struct ptcp_vconn, vconn);
340 ptcp_open(const char *name, char *suffix, struct vconn **vconnp)
342 struct sockaddr_in sin;
343 struct ptcp_vconn *ptcp;
346 unsigned int yes = 1;
348 fd = socket(AF_INET, SOCK_STREAM, 0);
350 VLOG_ERR("%s: socket: %s", name, strerror(errno));
354 if ( setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,&yes,sizeof(yes)) < 0) {
355 VLOG_ERR("%s: setsockopt::SO_REUSEADDR: %s", name, strerror(errno));
360 memset(&sin, 0, sizeof sin);
361 sin.sin_family = AF_INET;
362 sin.sin_addr.s_addr = htonl(INADDR_ANY);
363 sin.sin_port = htons(atoi(suffix) ? atoi(suffix) : OFP_TCP_PORT);
364 retval = bind(fd, (struct sockaddr *) &sin, sizeof sin);
367 VLOG_ERR("%s: bind: %s", name, strerror(error));
372 retval = listen(fd, 10);
375 VLOG_ERR("%s: listen: %s", name, strerror(error));
380 retval = set_nonblocking(fd);
386 ptcp = xmalloc(sizeof *ptcp);
387 ptcp->vconn.class = &ptcp_vconn_class;
388 ptcp->vconn.connect_status = 0;
390 *vconnp = &ptcp->vconn;
395 ptcp_close(struct vconn *vconn)
397 struct ptcp_vconn *ptcp = ptcp_vconn_cast(vconn);
403 ptcp_accept(struct vconn *vconn, struct vconn **new_vconnp)
405 struct ptcp_vconn *ptcp = ptcp_vconn_cast(vconn);
406 struct sockaddr_in sin;
407 socklen_t sin_len = sizeof sin;
412 new_fd = accept(ptcp->fd, &sin, &sin_len);
415 if (error != EAGAIN) {
416 VLOG_DBG("accept: %s", strerror(error));
421 error = set_nonblocking(new_fd);
427 sprintf(name, "tcp:"IP_FMT, IP_ARGS(&sin.sin_addr));
428 if (sin.sin_port != htons(OFP_TCP_PORT)) {
429 sprintf(strchr(name, '\0'), ":%"PRIu16, ntohs(sin.sin_port));
431 return new_tcp_vconn(name, new_fd, 0, &sin, new_vconnp);
435 ptcp_wait(struct vconn *vconn, enum vconn_wait_type wait)
437 struct ptcp_vconn *ptcp = ptcp_vconn_cast(vconn);
438 assert(wait == WAIT_ACCEPT);
439 poll_fd_wait(ptcp->fd, POLLIN);
442 struct vconn_class ptcp_vconn_class = {
446 .accept = ptcp_accept,