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.
38 #include <netinet/in.h>
44 #include "ofp-print.h"
46 #include "poll-loop.h"
50 #define THIS_MODULE VLM_vconn
53 static struct vconn_class *vconn_classes[] = {
65 /* Check the validity of the vconn class structures. */
67 check_vconn_classes(void)
72 for (i = 0; i < ARRAY_SIZE(vconn_classes); i++) {
73 struct vconn_class *class = vconn_classes[i];
74 assert(class->name != NULL);
75 assert(class->open != NULL);
76 assert(class->close != NULL);
78 ? !class->recv && !class->send
79 : class->recv && class->send);
80 assert(class->wait != NULL);
85 /* Prints information on active (if 'active') and passive (if 'passive')
86 * connection methods supported by the vconn. */
88 vconn_usage(bool active, bool passive)
90 /* Really this should be implemented via callbacks into the vconn
91 * providers, but that seems too heavy-weight to bother with at the
96 printf("Active OpenFlow connection methods:\n");
99 "local datapath DP_IDX\n");
101 printf(" tcp:HOST[:PORT] "
102 "PORT (default: %d) on remote TCP HOST\n", OFP_TCP_PORT);
104 printf(" ssl:HOST[:PORT] "
105 "SSL PORT (default: %d) on remote HOST\n", OFP_SSL_PORT);
110 printf("Passive OpenFlow connection methods:\n");
111 printf(" ptcp:[PORT] "
112 "listen to TCP PORT (default: %d)\n",
115 printf(" pssl:[PORT] "
116 "listen for SSL on PORT (default: %d)\n",
122 printf("PKI configuration (required to use SSL):\n"
123 " -p, --private-key=FILE file with private key\n"
124 " -c, --certificate=FILE file with certificate for private key\n"
125 " -C, --ca-cert=FILE file with peer CA certificate\n");
129 /* Attempts to connect to an OpenFlow device. 'name' is a connection name in
130 * the form "TYPE:ARGS", where TYPE is the vconn class's name and ARGS are
131 * vconn class-specific.
133 * Returns 0 if successful, otherwise a positive errno value. If successful,
134 * stores a pointer to the new connection in '*vconnp', otherwise a null
137 vconn_open(const char *name, struct vconn **vconnp)
142 check_vconn_classes();
144 prefix_len = strcspn(name, ":");
145 if (prefix_len == strlen(name)) {
146 fatal(0, "`%s' not correct format for peer name", name);
148 for (i = 0; i < ARRAY_SIZE(vconn_classes); i++) {
149 struct vconn_class *class = vconn_classes[i];
150 if (strlen(class->name) == prefix_len
151 && !memcmp(class->name, name, prefix_len)) {
152 char *suffix_copy = xstrdup(name + prefix_len + 1);
153 int retval = class->open(name, suffix_copy, vconnp);
158 assert((*vconnp)->connect_status != EAGAIN
159 || (*vconnp)->class->connect);
164 fatal(0, "unknown peer type `%.*s'", (int) prefix_len, name);
169 vconn_open_block(const char *name, struct vconn **vconnp)
174 error = vconn_open(name, &vconn);
175 while (error == EAGAIN) {
176 vconn_connect_wait(vconn);
178 error = vconn_connect(vconn);
179 assert(error != EINPROGRESS);
190 /* Closes 'vconn'. */
192 vconn_close(struct vconn *vconn)
195 (vconn->class->close)(vconn);
199 /* Returns true if 'vconn' is a passive vconn, that is, its purpose is to
200 * wait for connections to arrive, not to transfer data. Returns false if
201 * 'vconn' is an active vconn, that is, its purpose is to transfer data, not
202 * to wait for new connections to arrive. */
204 vconn_is_passive(const struct vconn *vconn)
206 return vconn->class->accept != NULL;
209 /* Returns the IP address of the peer, or 0 if the peer is not connected over
210 * an IP-based protocol or if its IP address is not yet known. */
212 vconn_get_ip(const struct vconn *vconn)
217 /* Tries to complete the connection on 'vconn', which must be an active
218 * vconn. If 'vconn''s connection is complete, returns 0 if the connection
219 * was successful or a positive errno value if it failed. If the
220 * connection is still in progress, returns EAGAIN. */
222 vconn_connect(struct vconn *vconn)
224 if (vconn->connect_status == EAGAIN) {
225 vconn->connect_status = (vconn->class->connect)(vconn);
226 assert(vconn->connect_status != EINPROGRESS);
228 return vconn->connect_status;
231 /* Tries to accept a new connection on 'vconn', which must be a passive vconn.
232 * If successful, stores the new connection in '*new_vconn' and returns 0.
233 * Otherwise, returns a positive errno value.
235 * vconn_accept will not block waiting for a connection. If no connection is
236 * ready to be accepted, it returns EAGAIN immediately. */
238 vconn_accept(struct vconn *vconn, struct vconn **new_vconn)
242 retval = (vconn->class->accept)(vconn, new_vconn);
247 assert((*new_vconn)->connect_status != EAGAIN
248 || (*new_vconn)->class->connect);
253 /* Tries to receive an OpenFlow message from 'vconn', which must be an active
254 * vconn. If successful, stores the received message into '*msgp' and returns
255 * 0. The caller is responsible for destroying the message with
256 * buffer_delete(). On failure, returns a positive errno value and stores a
257 * null pointer into '*msgp'. On normal connection close, returns EOF.
259 * vconn_recv will not block waiting for a packet to arrive. If no packets
260 * have been received, it returns EAGAIN immediately. */
262 vconn_recv(struct vconn *vconn, struct buffer **msgp)
264 int retval = vconn_connect(vconn);
266 retval = (vconn->class->recv)(vconn, msgp);
267 if (VLOG_IS_DBG_ENABLED() && !retval) {
268 char *s = ofp_to_string((*msgp)->data, (*msgp)->size, 1);
269 VLOG_DBG("received: %s", s);
279 /* Tries to queue 'msg' for transmission on 'vconn', which must be an active
280 * vconn. If successful, returns 0, in which case ownership of 'msg' is
281 * transferred to the vconn. Success does not guarantee that 'msg' has been or
282 * ever will be delivered to the peer, only that it has been queued for
285 * Returns a positive errno value on failure, in which case the caller
286 * retains ownership of 'msg'.
288 * vconn_send will not block. If 'msg' cannot be immediately accepted for
289 * transmission, it returns EAGAIN immediately. */
291 vconn_send(struct vconn *vconn, struct buffer *msg)
293 int retval = vconn_connect(vconn);
295 if (!VLOG_IS_DBG_ENABLED()) {
296 retval = (vconn->class->send)(vconn, msg);
298 char *s = ofp_to_string(msg->data, msg->size, 1);
299 retval = (vconn->class->send)(vconn, msg);
300 if (retval != EAGAIN) {
301 VLOG_DBG("sent (%s): %s", strerror(retval), s);
309 /* Same as vconn_send, except that it waits until 'msg' can be transmitted. */
311 vconn_send_block(struct vconn *vconn, struct buffer *msg)
314 while ((retval = vconn_send(vconn, msg)) == EAGAIN) {
315 vconn_send_wait(vconn);
316 VLOG_DBG("blocking on vconn send");
322 /* Same as vconn_recv, except that it waits until a message is received. */
324 vconn_recv_block(struct vconn *vconn, struct buffer **msgp)
327 while ((retval = vconn_recv(vconn, msgp)) == EAGAIN) {
328 vconn_recv_wait(vconn);
329 VLOG_DBG("blocking on vconn receive");
335 /* Sends 'request' to 'vconn' and blocks until it receives a reply with a
336 * matching transaction ID. Returns 0 if successful, in which case the reply
337 * is stored in '*replyp' for the caller to examine and free. Otherwise
338 * returns a positive errno value, or EOF, and sets '*replyp' to null.
340 * 'request' is always destroyed, regardless of the return value. */
342 vconn_transact(struct vconn *vconn, struct buffer *request,
343 struct buffer **replyp)
345 uint32_t send_xid = ((struct ofp_header *) request->data)->xid;
349 error = vconn_send_block(vconn, request);
351 buffer_delete(request);
356 struct buffer *reply;
358 error = vconn_recv_block(vconn, &reply);
362 recv_xid = ((struct ofp_header *) reply->data)->xid;
363 if (send_xid == recv_xid) {
368 VLOG_DBG("received reply with xid %08"PRIx32" != expected %08"PRIx32,
370 buffer_delete(reply);
375 vconn_wait(struct vconn *vconn, enum vconn_wait_type wait)
379 assert(vconn_is_passive(vconn)
380 ? wait == WAIT_ACCEPT || wait == WAIT_CONNECT
381 : wait == WAIT_CONNECT || wait == WAIT_RECV || wait == WAIT_SEND);
383 connect_status = vconn_connect(vconn);
384 if (connect_status) {
385 if (connect_status == EAGAIN) {
388 poll_immediate_wake();
393 (vconn->class->wait)(vconn, wait);
397 vconn_connect_wait(struct vconn *vconn)
399 vconn_wait(vconn, WAIT_CONNECT);
403 vconn_accept_wait(struct vconn *vconn)
405 vconn_wait(vconn, WAIT_ACCEPT);
409 vconn_recv_wait(struct vconn *vconn)
411 vconn_wait(vconn, WAIT_RECV);
415 vconn_send_wait(struct vconn *vconn)
417 vconn_wait(vconn, WAIT_SEND);
420 /* Allocates and returns the first byte of a buffer 'openflow_len' bytes long,
421 * containing an OpenFlow header with the given 'type' and a random transaction
422 * id. Stores the new buffer in '*bufferp'. The caller must free the buffer
423 * when it is no longer needed. */
425 make_openflow(size_t openflow_len, uint8_t type, struct buffer **bufferp)
427 return make_openflow_xid(openflow_len, type, random_uint32(), bufferp);
430 /* Allocates and returns the first byte of a buffer 'openflow_len' bytes long,
431 * containing an OpenFlow header with the given 'type' and transaction id
432 * 'xid'. Stores the new buffer in '*bufferp'. The caller must free the
433 * buffer when it is no longer needed. */
435 make_openflow_xid(size_t openflow_len, uint8_t type, uint32_t xid,
436 struct buffer **bufferp)
438 struct buffer *buffer;
439 struct ofp_header *oh;
441 assert(openflow_len >= sizeof *oh);
442 assert(openflow_len <= UINT16_MAX);
443 buffer = *bufferp = buffer_new(openflow_len);
444 oh = buffer_put_uninit(buffer, openflow_len);
445 memset(oh, 0, openflow_len);
446 oh->version = OFP_VERSION;
448 oh->length = htons(openflow_len);
453 /* Updates the 'length' field of the OpenFlow message in 'buffer' to
456 update_openflow_length(struct buffer *buffer)
458 struct ofp_header *oh = buffer_at_assert(buffer, 0, sizeof *oh);
459 oh->length = htons(buffer->size);
463 make_add_simple_flow(const struct flow *flow,
464 uint32_t buffer_id, uint16_t out_port, uint16_t max_idle)
466 struct ofp_flow_mod *ofm;
467 size_t size = sizeof *ofm + sizeof ofm->actions[0];
468 struct buffer *out = buffer_new(size);
469 ofm = buffer_put_uninit(out, size);
470 memset(ofm, 0, size);
471 ofm->header.version = OFP_VERSION;
472 ofm->header.type = OFPT_FLOW_MOD;
473 ofm->header.length = htons(size);
474 ofm->match.wildcards = htons(0);
475 ofm->match.in_port = flow->in_port;
476 memcpy(ofm->match.dl_src, flow->dl_src, sizeof ofm->match.dl_src);
477 memcpy(ofm->match.dl_dst, flow->dl_dst, sizeof ofm->match.dl_dst);
478 ofm->match.dl_vlan = flow->dl_vlan;
479 ofm->match.dl_type = flow->dl_type;
480 ofm->match.nw_src = flow->nw_src;
481 ofm->match.nw_dst = flow->nw_dst;
482 ofm->match.nw_proto = flow->nw_proto;
483 ofm->match.tp_src = flow->tp_src;
484 ofm->match.tp_dst = flow->tp_dst;
485 ofm->command = htons(OFPFC_ADD);
486 ofm->max_idle = htons(max_idle);
487 ofm->buffer_id = htonl(buffer_id);
488 ofm->actions[0].type = htons(OFPAT_OUTPUT);
489 ofm->actions[0].arg.output.max_len = htons(0);
490 ofm->actions[0].arg.output.port = htons(out_port);
495 make_unbuffered_packet_out(const struct buffer *packet,
496 uint16_t in_port, uint16_t out_port)
498 struct ofp_packet_out *opo;
499 size_t size = sizeof *opo + packet->size;
500 struct buffer *out = buffer_new(size);
501 opo = buffer_put_uninit(out, size);
502 memset(opo, 0, sizeof *opo);
503 opo->header.version = OFP_VERSION;
504 opo->header.type = OFPT_PACKET_OUT;
505 opo->header.length = htons(size);
506 opo->buffer_id = htonl(UINT32_MAX);
507 opo->in_port = htons(in_port);
508 opo->out_port = htons(out_port);
509 memcpy(opo->u.data, packet->data, packet->size);
514 make_buffered_packet_out(uint32_t buffer_id,
515 uint16_t in_port, uint16_t out_port)
517 struct ofp_packet_out *opo;
518 size_t size = sizeof *opo + sizeof opo->u.actions[0];
519 struct buffer *out = buffer_new(size);
520 opo = buffer_put_uninit(out, size);
521 memset(opo, 0, size);
522 opo->header.version = OFP_VERSION;
523 opo->header.type = OFPT_PACKET_OUT;
524 opo->header.length = htons(size);
525 opo->buffer_id = htonl(buffer_id);
526 opo->in_port = htons(in_port);
527 opo->out_port = htons(out_port);
528 opo->u.actions[0].type = htons(OFPAT_OUTPUT);
529 opo->u.actions[0].arg.output.max_len = htons(0);
530 opo->u.actions[0].arg.output.port = htons(out_port);
534 /* Creates and returns an OFPT_ECHO_REQUEST message with an empty payload. */
536 make_echo_request(void)
538 struct ofp_header *rq;
539 struct buffer *out = buffer_new(sizeof *rq);
540 rq = buffer_put_uninit(out, sizeof *rq);
541 rq->version = OFP_VERSION;
542 rq->type = OFPT_ECHO_REQUEST;
543 rq->length = htons(sizeof *rq);
548 /* Creates and returns an OFPT_ECHO_REPLY message matching the
549 * OFPT_ECHO_REQUEST message in 'rq'. */
551 make_echo_reply(const struct ofp_header *rq)
553 size_t size = ntohs(rq->length);
554 struct buffer *out = buffer_new(size);
555 struct ofp_header *reply = buffer_put(out, rq, size);
556 reply->type = OFPT_ECHO_REPLY;