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.
37 #include <netinet/in.h>
43 #include "ofp-print.h"
45 #include "poll-loop.h"
48 #define THIS_MODULE VLM_vconn
51 static struct vconn_class *vconn_classes[] = {
63 /* Check the validity of the vconn class structures. */
65 check_vconn_classes(void)
70 for (i = 0; i < ARRAY_SIZE(vconn_classes); i++) {
71 struct vconn_class *class = vconn_classes[i];
72 assert(class->name != NULL);
73 assert(class->open != NULL);
74 assert(class->close != NULL);
76 ? !class->recv && !class->send
77 : class->recv && class->send);
78 assert(class->wait != NULL);
83 /* Attempts to connect to an OpenFlow device. 'name' is a connection name in
84 * the form "TYPE:ARGS", where TYPE is the vconn class's name and ARGS are
85 * vconn class-specific.
87 * Returns 0 if successful, otherwise a positive errno value. If successful,
88 * stores a pointer to the new connection in '*vconnp', otherwise a null
91 vconn_open(const char *name, struct vconn **vconnp)
96 check_vconn_classes();
98 prefix_len = strcspn(name, ":");
99 if (prefix_len == strlen(name)) {
100 fatal(0, "`%s' not correct format for peer name", name);
102 for (i = 0; i < ARRAY_SIZE(vconn_classes); i++) {
103 struct vconn_class *class = vconn_classes[i];
104 if (strlen(class->name) == prefix_len
105 && !memcmp(class->name, name, prefix_len)) {
106 char *suffix_copy = xstrdup(name + prefix_len + 1);
107 int retval = class->open(name, suffix_copy, vconnp);
112 assert((*vconnp)->connect_status != EAGAIN
113 || (*vconnp)->class->connect);
118 fatal(0, "unknown peer type `%.*s'", (int) prefix_len, name);
123 vconn_open_block(const char *name, struct vconn **vconnp)
128 error = vconn_open(name, &vconn);
129 while (error == EAGAIN) {
130 vconn_connect_wait(vconn);
132 error = vconn_connect(vconn);
133 assert(error != EINPROGRESS);
144 /* Closes 'vconn'. */
146 vconn_close(struct vconn *vconn)
149 (vconn->class->close)(vconn);
153 /* Returns true if 'vconn' is a passive vconn, that is, its purpose is to
154 * wait for connections to arrive, not to transfer data. Returns false if
155 * 'vconn' is an active vconn, that is, its purpose is to transfer data, not
156 * to wait for new connections to arrive. */
158 vconn_is_passive(const struct vconn *vconn)
160 return vconn->class->accept != NULL;
163 /* Tries to complete the connection on 'vconn', which must be an active
164 * vconn. If 'vconn''s connection is complete, returns 0 if the connection
165 * was successful or a positive errno value if it failed. If the
166 * connection is still in progress, returns EAGAIN. */
168 vconn_connect(struct vconn *vconn)
170 if (vconn->connect_status == EAGAIN) {
171 vconn->connect_status = (vconn->class->connect)(vconn);
172 assert(vconn->connect_status != EINPROGRESS);
174 return vconn->connect_status;
177 /* Tries to accept a new connection on 'vconn', which must be a passive vconn.
178 * If successful, stores the new connection in '*new_vconn' and returns 0.
179 * Otherwise, returns a positive errno value.
181 * vconn_accept will not block waiting for a connection. If no connection is
182 * ready to be accepted, it returns EAGAIN immediately. */
184 vconn_accept(struct vconn *vconn, struct vconn **new_vconn)
188 retval = (vconn->class->accept)(vconn, new_vconn);
193 assert((*new_vconn)->connect_status != EAGAIN
194 || (*new_vconn)->class->connect);
199 /* Tries to receive an OpenFlow message from 'vconn', which must be an active
200 * vconn. If successful, stores the received message into '*msgp' and returns
201 * 0. The caller is responsible for destroying the message with
202 * buffer_delete(). On failure, returns a positive errno value and stores a
203 * null pointer into '*msgp'. On normal connection close, returns EOF.
205 * vconn_recv will not block waiting for a packet to arrive. If no packets
206 * have been received, it returns EAGAIN immediately. */
208 vconn_recv(struct vconn *vconn, struct buffer **msgp)
210 int retval = vconn_connect(vconn);
212 retval = (vconn->class->recv)(vconn, msgp);
213 if (VLOG_IS_DBG_ENABLED() && !retval) {
214 char *s = ofp_to_string((*msgp)->data, (*msgp)->size, 1);
215 VLOG_DBG("received: %s", s);
225 /* Tries to queue 'msg' for transmission on 'vconn', which must be an active
226 * vconn. If successful, returns 0, in which case ownership of 'msg' is
227 * transferred to the vconn. Success does not guarantee that 'msg' has been or
228 * ever will be delivered to the peer, only that it has been queued for
231 * Returns a positive errno value on failure, in which case the caller
232 * retains ownership of 'msg'.
234 * vconn_send will not block. If 'msg' cannot be immediately accepted for
235 * transmission, it returns EAGAIN immediately. */
237 vconn_send(struct vconn *vconn, struct buffer *msg)
239 int retval = vconn_connect(vconn);
241 if (!VLOG_IS_DBG_ENABLED()) {
242 retval = (vconn->class->send)(vconn, msg);
244 char *s = ofp_to_string(msg->data, msg->size, 1);
245 retval = (vconn->class->send)(vconn, msg);
246 if (retval != EAGAIN) {
247 VLOG_DBG("sent (%s): %s", strerror(retval), s);
255 /* Same as vconn_send, except that it waits until 'msg' can be transmitted. */
257 vconn_send_block(struct vconn *vconn, struct buffer *msg)
260 while ((retval = vconn_send(vconn, msg)) == EAGAIN) {
261 vconn_send_wait(vconn);
268 vconn_wait(struct vconn *vconn, enum vconn_wait_type wait)
272 assert(vconn_is_passive(vconn)
273 ? wait == WAIT_ACCEPT || wait == WAIT_CONNECT
274 : wait == WAIT_CONNECT || wait == WAIT_RECV || wait == WAIT_SEND);
276 connect_status = vconn_connect(vconn);
277 if (connect_status) {
278 if (connect_status == EAGAIN) {
281 poll_immediate_wake();
286 (vconn->class->wait)(vconn, wait);
290 vconn_connect_wait(struct vconn *vconn)
292 vconn_wait(vconn, WAIT_CONNECT);
296 vconn_accept_wait(struct vconn *vconn)
298 vconn_wait(vconn, WAIT_ACCEPT);
302 vconn_recv_wait(struct vconn *vconn)
304 vconn_wait(vconn, WAIT_RECV);
308 vconn_send_wait(struct vconn *vconn)
310 vconn_wait(vconn, WAIT_SEND);
314 make_add_simple_flow(const struct flow *flow,
315 uint32_t buffer_id, uint16_t out_port)
317 struct ofp_flow_mod *ofm;
318 size_t size = sizeof *ofm + sizeof ofm->actions[0];
319 struct buffer *out = buffer_new(size);
320 ofm = buffer_put_uninit(out, size);
321 memset(ofm, 0, size);
322 ofm->header.version = OFP_VERSION;
323 ofm->header.type = OFPT_FLOW_MOD;
324 ofm->header.length = htons(size);
325 ofm->match.wildcards = htons(0);
326 ofm->match.in_port = flow->in_port;
327 memcpy(ofm->match.dl_src, flow->dl_src, sizeof ofm->match.dl_src);
328 memcpy(ofm->match.dl_dst, flow->dl_dst, sizeof ofm->match.dl_dst);
329 ofm->match.dl_vlan = flow->dl_vlan;
330 ofm->match.dl_type = flow->dl_type;
331 ofm->match.nw_src = flow->nw_src;
332 ofm->match.nw_dst = flow->nw_dst;
333 ofm->match.nw_proto = flow->nw_proto;
334 ofm->match.tp_src = flow->tp_src;
335 ofm->match.tp_dst = flow->tp_dst;
336 ofm->command = htons(OFPFC_ADD);
337 ofm->max_idle = htons(60);
338 ofm->buffer_id = htonl(buffer_id);
339 ofm->group_id = htonl(0);
340 ofm->actions[0].type = htons(OFPAT_OUTPUT);
341 ofm->actions[0].arg.output.max_len = htons(0);
342 ofm->actions[0].arg.output.port = htons(out_port);
347 make_unbuffered_packet_out(const struct buffer *packet,
348 uint16_t in_port, uint16_t out_port)
350 struct ofp_packet_out *opo;
351 size_t size = sizeof *opo + packet->size;
352 struct buffer *out = buffer_new(size);
353 opo = buffer_put_uninit(out, size);
354 memset(opo, 0, sizeof *opo);
355 opo->header.version = OFP_VERSION;
356 opo->header.type = OFPT_PACKET_OUT;
357 opo->header.length = htons(size);
358 opo->buffer_id = htonl(UINT32_MAX);
359 opo->in_port = htons(in_port);
360 opo->out_port = htons(out_port);
361 memcpy(opo->u.data, packet->data, packet->size);
366 make_buffered_packet_out(uint32_t buffer_id,
367 uint16_t in_port, uint16_t out_port)
369 struct ofp_packet_out *opo;
370 size_t size = sizeof *opo + sizeof opo->u.actions[0];
371 struct buffer *out = buffer_new(size);
372 opo = buffer_put_uninit(out, size);
373 memset(opo, 0, size);
374 opo->header.version = OFP_VERSION;
375 opo->header.type = OFPT_PACKET_OUT;
376 opo->header.length = htons(size);
377 opo->buffer_id = htonl(buffer_id);
378 opo->in_port = htons(in_port);
379 opo->out_port = htons(out_port);
380 opo->u.actions[0].type = htons(OFPAT_OUTPUT);
381 opo->u.actions[0].arg.output.max_len = htons(0);
382 opo->u.actions[0].arg.output.port = htons(out_port);