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"
49 #define THIS_MODULE VLM_vconn
52 static struct vconn_class *vconn_classes[] = {
64 /* Check the validity of the vconn class structures. */
66 check_vconn_classes(void)
71 for (i = 0; i < ARRAY_SIZE(vconn_classes); i++) {
72 struct vconn_class *class = vconn_classes[i];
73 assert(class->name != NULL);
74 assert(class->open != NULL);
75 assert(class->close != NULL);
77 ? !class->recv && !class->send
78 : class->recv && class->send);
79 assert(class->wait != NULL);
84 /* Prints information on active (if 'active') and passive (if 'passive')
85 * connection methods supported by the vconn. */
87 vconn_usage(bool active, bool passive)
89 /* Really this should be implemented via callbacks into the vconn
90 * providers, but that seems too heavy-weight to bother with at the
95 printf("Active OpenFlow connection methods:\n");
98 "local datapath DP_IDX\n");
100 printf(" tcp:HOST[:PORT] "
101 "PORT (default: %d) on remote TCP HOST\n", OFP_TCP_PORT);
103 printf(" ssl:HOST[:PORT] "
104 "SSL PORT (default: %d) on remote HOST\n", OFP_SSL_PORT);
109 printf("Passive OpenFlow connection methods:\n");
110 printf(" ptcp:[PORT] "
111 "listen to TCP PORT (default: %d)\n",
114 printf(" pssl:[PORT] "
115 "listen for SSL on PORT (default: %d)\n",
121 printf("PKI configuration (required to use SSL):\n"
122 " -p, --private-key=FILE file with private key\n"
123 " -c, --certificate=FILE file with certificate for private key\n"
124 " -C, --ca-cert=FILE file with peer CA certificate\n");
128 /* Attempts to connect to an OpenFlow device. 'name' is a connection name in
129 * the form "TYPE:ARGS", where TYPE is the vconn class's name and ARGS are
130 * vconn class-specific.
132 * Returns 0 if successful, otherwise a positive errno value. If successful,
133 * stores a pointer to the new connection in '*vconnp', otherwise a null
136 vconn_open(const char *name, struct vconn **vconnp)
141 check_vconn_classes();
143 prefix_len = strcspn(name, ":");
144 if (prefix_len == strlen(name)) {
145 fatal(0, "`%s' not correct format for peer name", name);
147 for (i = 0; i < ARRAY_SIZE(vconn_classes); i++) {
148 struct vconn_class *class = vconn_classes[i];
149 if (strlen(class->name) == prefix_len
150 && !memcmp(class->name, name, prefix_len)) {
151 char *suffix_copy = xstrdup(name + prefix_len + 1);
152 int retval = class->open(name, suffix_copy, vconnp);
157 assert((*vconnp)->connect_status != EAGAIN
158 || (*vconnp)->class->connect);
163 fatal(0, "unknown peer type `%.*s'", (int) prefix_len, name);
168 vconn_open_block(const char *name, struct vconn **vconnp)
173 error = vconn_open(name, &vconn);
174 while (error == EAGAIN) {
175 vconn_connect_wait(vconn);
177 error = vconn_connect(vconn);
178 assert(error != EINPROGRESS);
189 /* Closes 'vconn'. */
191 vconn_close(struct vconn *vconn)
194 (vconn->class->close)(vconn);
198 /* Returns true if 'vconn' is a passive vconn, that is, its purpose is to
199 * wait for connections to arrive, not to transfer data. Returns false if
200 * 'vconn' is an active vconn, that is, its purpose is to transfer data, not
201 * to wait for new connections to arrive. */
203 vconn_is_passive(const struct vconn *vconn)
205 return vconn->class->accept != NULL;
208 /* Returns the IP address of the peer, or 0 if the peer is not connected over
209 * an IP-based protocol or if its IP address is not yet known. */
211 vconn_get_ip(const struct vconn *vconn)
216 /* Tries to complete the connection on 'vconn', which must be an active
217 * vconn. If 'vconn''s connection is complete, returns 0 if the connection
218 * was successful or a positive errno value if it failed. If the
219 * connection is still in progress, returns EAGAIN. */
221 vconn_connect(struct vconn *vconn)
223 if (vconn->connect_status == EAGAIN) {
224 vconn->connect_status = (vconn->class->connect)(vconn);
225 assert(vconn->connect_status != EINPROGRESS);
227 return vconn->connect_status;
230 /* Tries to accept a new connection on 'vconn', which must be a passive vconn.
231 * If successful, stores the new connection in '*new_vconn' and returns 0.
232 * Otherwise, returns a positive errno value.
234 * vconn_accept will not block waiting for a connection. If no connection is
235 * ready to be accepted, it returns EAGAIN immediately. */
237 vconn_accept(struct vconn *vconn, struct vconn **new_vconn)
241 retval = (vconn->class->accept)(vconn, new_vconn);
246 assert((*new_vconn)->connect_status != EAGAIN
247 || (*new_vconn)->class->connect);
252 /* Tries to receive an OpenFlow message from 'vconn', which must be an active
253 * vconn. If successful, stores the received message into '*msgp' and returns
254 * 0. The caller is responsible for destroying the message with
255 * buffer_delete(). On failure, returns a positive errno value and stores a
256 * null pointer into '*msgp'. On normal connection close, returns EOF.
258 * vconn_recv will not block waiting for a packet to arrive. If no packets
259 * have been received, it returns EAGAIN immediately. */
261 vconn_recv(struct vconn *vconn, struct buffer **msgp)
263 int retval = vconn_connect(vconn);
265 retval = (vconn->class->recv)(vconn, msgp);
266 if (VLOG_IS_DBG_ENABLED() && !retval) {
267 char *s = ofp_to_string((*msgp)->data, (*msgp)->size, 1);
268 VLOG_DBG("received: %s", s);
278 /* Tries to queue 'msg' for transmission on 'vconn', which must be an active
279 * vconn. If successful, returns 0, in which case ownership of 'msg' is
280 * transferred to the vconn. Success does not guarantee that 'msg' has been or
281 * ever will be delivered to the peer, only that it has been queued for
284 * Returns a positive errno value on failure, in which case the caller
285 * retains ownership of 'msg'.
287 * vconn_send will not block. If 'msg' cannot be immediately accepted for
288 * transmission, it returns EAGAIN immediately. */
290 vconn_send(struct vconn *vconn, struct buffer *msg)
292 int retval = vconn_connect(vconn);
294 if (!VLOG_IS_DBG_ENABLED()) {
295 retval = (vconn->class->send)(vconn, msg);
297 char *s = ofp_to_string(msg->data, msg->size, 1);
298 retval = (vconn->class->send)(vconn, msg);
299 if (retval != EAGAIN) {
300 VLOG_DBG("sent (%s): %s", strerror(retval), s);
308 /* Same as vconn_send, except that it waits until 'msg' can be transmitted. */
310 vconn_send_block(struct vconn *vconn, struct buffer *msg)
313 while ((retval = vconn_send(vconn, msg)) == EAGAIN) {
314 vconn_send_wait(vconn);
315 VLOG_DBG("blocking on vconn send");
321 /* Same as vconn_recv, except that it waits until a message is received. */
323 vconn_recv_block(struct vconn *vconn, struct buffer **msgp)
326 while ((retval = vconn_recv(vconn, msgp)) == EAGAIN) {
327 vconn_recv_wait(vconn);
328 VLOG_DBG("blocking on vconn receive");
335 vconn_wait(struct vconn *vconn, enum vconn_wait_type wait)
339 assert(vconn_is_passive(vconn)
340 ? wait == WAIT_ACCEPT || wait == WAIT_CONNECT
341 : wait == WAIT_CONNECT || wait == WAIT_RECV || wait == WAIT_SEND);
343 connect_status = vconn_connect(vconn);
344 if (connect_status) {
345 if (connect_status == EAGAIN) {
348 poll_immediate_wake();
353 (vconn->class->wait)(vconn, wait);
357 vconn_connect_wait(struct vconn *vconn)
359 vconn_wait(vconn, WAIT_CONNECT);
363 vconn_accept_wait(struct vconn *vconn)
365 vconn_wait(vconn, WAIT_ACCEPT);
369 vconn_recv_wait(struct vconn *vconn)
371 vconn_wait(vconn, WAIT_RECV);
375 vconn_send_wait(struct vconn *vconn)
377 vconn_wait(vconn, WAIT_SEND);
380 /* Allocates and returns the first byte of a buffer 'openflow_len' bytes long,
381 * containing an OpenFlow header with the given 'type' and a random transaction
382 * id. Stores the new buffer in '*bufferp'. The caller must free the buffer
383 * when it is no longer needed. */
385 make_openflow(size_t openflow_len, uint8_t type, struct buffer **bufferp)
387 return make_openflow_xid(openflow_len, type, random_uint32(), bufferp);
390 /* Allocates and returns the first byte of a buffer 'openflow_len' bytes long,
391 * containing an OpenFlow header with the given 'type' and transaction id
392 * 'xid'. Stores the new buffer in '*bufferp'. The caller must free the
393 * buffer when it is no longer needed. */
395 make_openflow_xid(size_t openflow_len, uint8_t type, uint32_t xid,
396 struct buffer **bufferp)
398 struct buffer *buffer;
399 struct ofp_header *oh;
401 assert(openflow_len >= sizeof *oh);
402 assert(openflow_len <= UINT16_MAX);
403 buffer = *bufferp = buffer_new(openflow_len);
404 oh = buffer_put_uninit(buffer, openflow_len);
405 memset(oh, 0, openflow_len);
406 oh->version = OFP_VERSION;
408 oh->length = htons(openflow_len);
413 /* Updates the 'length' field of the OpenFlow message in 'buffer' to
416 update_openflow_length(struct buffer *buffer)
418 struct ofp_header *oh = buffer_at_assert(buffer, 0, sizeof *oh);
419 oh->length = htons(buffer->size);
423 make_add_simple_flow(const struct flow *flow,
424 uint32_t buffer_id, uint16_t out_port, uint16_t max_idle)
426 struct ofp_flow_mod *ofm;
427 size_t size = sizeof *ofm + sizeof ofm->actions[0];
428 struct buffer *out = buffer_new(size);
429 ofm = buffer_put_uninit(out, size);
430 memset(ofm, 0, size);
431 ofm->header.version = OFP_VERSION;
432 ofm->header.type = OFPT_FLOW_MOD;
433 ofm->header.length = htons(size);
434 ofm->match.wildcards = htons(0);
435 ofm->match.in_port = flow->in_port;
436 memcpy(ofm->match.dl_src, flow->dl_src, sizeof ofm->match.dl_src);
437 memcpy(ofm->match.dl_dst, flow->dl_dst, sizeof ofm->match.dl_dst);
438 ofm->match.dl_vlan = flow->dl_vlan;
439 ofm->match.dl_type = flow->dl_type;
440 ofm->match.nw_src = flow->nw_src;
441 ofm->match.nw_dst = flow->nw_dst;
442 ofm->match.nw_proto = flow->nw_proto;
443 ofm->match.tp_src = flow->tp_src;
444 ofm->match.tp_dst = flow->tp_dst;
445 ofm->command = htons(OFPFC_ADD);
446 ofm->max_idle = htons(max_idle);
447 ofm->buffer_id = htonl(buffer_id);
448 ofm->actions[0].type = htons(OFPAT_OUTPUT);
449 ofm->actions[0].arg.output.max_len = htons(0);
450 ofm->actions[0].arg.output.port = htons(out_port);
455 make_unbuffered_packet_out(const struct buffer *packet,
456 uint16_t in_port, uint16_t out_port)
458 struct ofp_packet_out *opo;
459 size_t size = sizeof *opo + packet->size;
460 struct buffer *out = buffer_new(size);
461 opo = buffer_put_uninit(out, size);
462 memset(opo, 0, sizeof *opo);
463 opo->header.version = OFP_VERSION;
464 opo->header.type = OFPT_PACKET_OUT;
465 opo->header.length = htons(size);
466 opo->buffer_id = htonl(UINT32_MAX);
467 opo->in_port = htons(in_port);
468 opo->out_port = htons(out_port);
469 memcpy(opo->u.data, packet->data, packet->size);
474 make_buffered_packet_out(uint32_t buffer_id,
475 uint16_t in_port, uint16_t out_port)
477 struct ofp_packet_out *opo;
478 size_t size = sizeof *opo + sizeof opo->u.actions[0];
479 struct buffer *out = buffer_new(size);
480 opo = buffer_put_uninit(out, size);
481 memset(opo, 0, size);
482 opo->header.version = OFP_VERSION;
483 opo->header.type = OFPT_PACKET_OUT;
484 opo->header.length = htons(size);
485 opo->buffer_id = htonl(buffer_id);
486 opo->in_port = htons(in_port);
487 opo->out_port = htons(out_port);
488 opo->u.actions[0].type = htons(OFPAT_OUTPUT);
489 opo->u.actions[0].arg.output.max_len = htons(0);
490 opo->u.actions[0].arg.output.port = htons(out_port);
494 /* Creates and returns an OFPT_ECHO_REQUEST message with an empty payload. */
496 make_echo_request(void)
498 struct ofp_header *rq;
499 struct buffer *out = buffer_new(sizeof *rq);
500 rq = buffer_put_uninit(out, sizeof *rq);
501 rq->version = OFP_VERSION;
502 rq->type = OFPT_ECHO_REQUEST;
503 rq->length = htons(sizeof *rq);
508 /* Creates and returns an OFPT_ECHO_REPLY message matching the
509 * OFPT_ECHO_REQUEST message in 'rq'. */
511 make_echo_reply(const struct ofp_header *rq)
513 size_t size = ntohs(rq->length);
514 struct buffer *out = buffer_new(size);
515 struct ofp_header *reply = buffer_put(out, rq, size);
516 reply->type = OFPT_ECHO_REPLY;