2 * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #include "vconn-provider.h"
22 #include <netinet/in.h>
27 #include "dynamic-string.h"
28 #include "fatal-signal.h"
30 #include "ofp-errors.h"
31 #include "ofp-print.h"
34 #include "openflow/nicira-ext.h"
35 #include "openflow/openflow.h"
37 #include "poll-loop.h"
41 #include "socket-util.h"
43 VLOG_DEFINE_THIS_MODULE(vconn);
45 COVERAGE_DEFINE(vconn_open);
46 COVERAGE_DEFINE(vconn_received);
47 COVERAGE_DEFINE(vconn_sent);
49 /* State of an active vconn.*/
51 /* This is the ordinary progression of states. */
52 VCS_CONNECTING, /* Underlying vconn is not connected. */
53 VCS_SEND_HELLO, /* Waiting to send OFPT_HELLO message. */
54 VCS_RECV_HELLO, /* Waiting to receive OFPT_HELLO message. */
55 VCS_CONNECTED, /* Connection established. */
57 /* These states are entered only when something goes wrong. */
58 VCS_SEND_ERROR, /* Sending OFPT_ERROR message. */
59 VCS_DISCONNECTED /* Connection failed or connection closed. */
62 static struct vconn_class *vconn_classes[] = {
70 static struct pvconn_class *pvconn_classes[] = {
78 /* Rate limit for individual OpenFlow messages going over the vconn, output at
79 * DBG level. This is very high because, if these are enabled, it is because
80 * we really need to see them. */
81 static struct vlog_rate_limit ofmsg_rl = VLOG_RATE_LIMIT_INIT(600, 600);
83 /* Rate limit for OpenFlow message parse errors. These always indicate a bug
84 * in the peer and so there's not much point in showing a lot of them. */
85 static struct vlog_rate_limit bad_ofmsg_rl = VLOG_RATE_LIMIT_INIT(1, 5);
87 static int do_recv(struct vconn *, struct ofpbuf **);
88 static int do_send(struct vconn *, struct ofpbuf *);
90 /* Check the validity of the vconn class structures. */
92 check_vconn_classes(void)
97 for (i = 0; i < ARRAY_SIZE(vconn_classes); i++) {
98 struct vconn_class *class = vconn_classes[i];
99 assert(class->name != NULL);
100 assert(class->open != NULL);
101 if (class->close || class->recv || class->send
102 || class->run || class->run_wait || class->wait) {
103 assert(class->close != NULL);
104 assert(class->recv != NULL);
105 assert(class->send != NULL);
106 assert(class->wait != NULL);
108 /* This class delegates to another one. */
112 for (i = 0; i < ARRAY_SIZE(pvconn_classes); i++) {
113 struct pvconn_class *class = pvconn_classes[i];
114 assert(class->name != NULL);
115 assert(class->listen != NULL);
116 if (class->close || class->accept || class->wait) {
117 assert(class->close != NULL);
118 assert(class->accept != NULL);
119 assert(class->wait != NULL);
121 /* This class delegates to another one. */
127 /* Prints information on active (if 'active') and passive (if 'passive')
128 * connection methods supported by the vconn. If 'bootstrap' is true, also
129 * advertises options to bootstrap the CA certificate. */
131 vconn_usage(bool active, bool passive, bool bootstrap OVS_UNUSED)
133 /* Really this should be implemented via callbacks into the vconn
134 * providers, but that seems too heavy-weight to bother with at the
139 printf("Active OpenFlow connection methods:\n");
140 printf(" tcp:IP[:PORT] "
141 "PORT (default: %d) at remote IP\n", OFP_TCP_PORT);
143 printf(" ssl:IP[:PORT] "
144 "SSL PORT (default: %d) at remote IP\n", OFP_SSL_PORT);
146 printf(" unix:FILE Unix domain socket named FILE\n");
150 printf("Passive OpenFlow connection methods:\n");
151 printf(" ptcp:[PORT][:IP] "
152 "listen to TCP PORT (default: %d) on IP\n",
155 printf(" pssl:[PORT][:IP] "
156 "listen for SSL on PORT (default: %d) on IP\n",
159 printf(" punix:FILE "
160 "listen on Unix domain socket FILE\n");
164 printf("PKI configuration (required to use SSL):\n"
165 " -p, --private-key=FILE file with private key\n"
166 " -c, --certificate=FILE file with certificate for private key\n"
167 " -C, --ca-cert=FILE file with peer CA certificate\n");
169 printf(" --bootstrap-ca-cert=FILE file with peer CA certificate "
170 "to read or create\n");
175 /* Given 'name', a connection name in the form "TYPE:ARGS", stores the class
176 * named "TYPE" into '*classp' and returns 0. Returns EAFNOSUPPORT and stores
177 * a null pointer into '*classp' if 'name' is in the wrong form or if no such
180 vconn_lookup_class(const char *name, struct vconn_class **classp)
184 prefix_len = strcspn(name, ":");
185 if (name[prefix_len] != '\0') {
188 for (i = 0; i < ARRAY_SIZE(vconn_classes); i++) {
189 struct vconn_class *class = vconn_classes[i];
190 if (strlen(class->name) == prefix_len
191 && !memcmp(class->name, name, prefix_len)) {
202 /* Returns 0 if 'name' is a connection name in the form "TYPE:ARGS" and TYPE is
203 * a supported connection type, otherwise EAFNOSUPPORT. */
205 vconn_verify_name(const char *name)
207 struct vconn_class *class;
208 return vconn_lookup_class(name, &class);
211 /* Attempts to connect to an OpenFlow device. 'name' is a connection name in
212 * the form "TYPE:ARGS", where TYPE is an active vconn class's name and ARGS
213 * are vconn class-specific.
215 * The vconn will automatically negotiate an OpenFlow protocol version
216 * acceptable to both peers on the connection. The version negotiated will be
217 * no lower than 'min_version' and no higher than OFP10_VERSION.
219 * Returns 0 if successful, otherwise a positive errno value. If successful,
220 * stores a pointer to the new connection in '*vconnp', otherwise a null
223 vconn_open(const char *name, int min_version, struct vconn **vconnp,
226 struct vconn_class *class;
231 COVERAGE_INC(vconn_open);
232 check_vconn_classes();
234 /* Look up the class. */
235 error = vconn_lookup_class(name, &class);
240 /* Call class's "open" function. */
241 suffix_copy = xstrdup(strchr(name, ':') + 1);
242 error = class->open(name, suffix_copy, &vconn, dscp);
249 assert(vconn->state != VCS_CONNECTING || vconn->class->connect);
250 vconn->min_version = min_version;
259 /* Allows 'vconn' to perform maintenance activities, such as flushing output
262 vconn_run(struct vconn *vconn)
264 if (vconn->class->run) {
265 (vconn->class->run)(vconn);
269 /* Arranges for the poll loop to wake up when 'vconn' needs to perform
270 * maintenance activities. */
272 vconn_run_wait(struct vconn *vconn)
274 if (vconn->class->run_wait) {
275 (vconn->class->run_wait)(vconn);
280 vconn_open_block(const char *name, int min_version, struct vconn **vconnp)
287 error = vconn_open(name, min_version, &vconn, DSCP_DEFAULT);
289 while ((error = vconn_connect(vconn)) == EAGAIN) {
291 vconn_run_wait(vconn);
292 vconn_connect_wait(vconn);
295 assert(error != EINPROGRESS);
307 /* Closes 'vconn'. */
309 vconn_close(struct vconn *vconn)
312 char *name = vconn->name;
313 (vconn->class->close)(vconn);
318 /* Returns the name of 'vconn', that is, the string passed to vconn_open(). */
320 vconn_get_name(const struct vconn *vconn)
325 /* Returns the IP address of the peer, or 0 if the peer is not connected over
326 * an IP-based protocol or if its IP address is not yet known. */
328 vconn_get_remote_ip(const struct vconn *vconn)
330 return vconn->remote_ip;
333 /* Returns the transport port of the peer, or 0 if the connection does not
334 * contain a port or if the port is not yet known. */
336 vconn_get_remote_port(const struct vconn *vconn)
338 return vconn->remote_port;
341 /* Returns the IP address used to connect to the peer, or 0 if the
342 * connection is not an IP-based protocol or if its IP address is not
345 vconn_get_local_ip(const struct vconn *vconn)
347 return vconn->local_ip;
350 /* Returns the transport port used to connect to the peer, or 0 if the
351 * connection does not contain a port or if the port is not yet known. */
353 vconn_get_local_port(const struct vconn *vconn)
355 return vconn->local_port;
358 /* Returns the OpenFlow version negotiated with the peer, or -1 if version
359 * negotiation is not yet complete.
361 * A vconn that has successfully connected (that is, vconn_connect() or
362 * vconn_send() or vconn_recv() has returned 0) always negotiated a version. */
364 vconn_get_version(const struct vconn *vconn)
366 return vconn->version;
370 vcs_connecting(struct vconn *vconn)
372 int retval = (vconn->class->connect)(vconn);
373 assert(retval != EINPROGRESS);
375 vconn->state = VCS_SEND_HELLO;
376 } else if (retval != EAGAIN) {
377 vconn->state = VCS_DISCONNECTED;
378 vconn->error = retval;
383 vcs_send_hello(struct vconn *vconn)
388 make_openflow(sizeof(struct ofp_header), OFPT_HELLO, &b);
389 retval = do_send(vconn, b);
391 vconn->state = VCS_RECV_HELLO;
394 if (retval != EAGAIN) {
395 vconn->state = VCS_DISCONNECTED;
396 vconn->error = retval;
402 vcs_recv_hello(struct vconn *vconn)
407 retval = do_recv(vconn, &b);
409 struct ofp_header *oh = b->data;
411 if (oh->type == OFPT_HELLO) {
412 if (b->size > sizeof *oh) {
413 struct ds msg = DS_EMPTY_INITIALIZER;
414 ds_put_format(&msg, "%s: extra-long hello:\n", vconn->name);
415 ds_put_hex_dump(&msg, b->data, b->size, 0, true);
416 VLOG_WARN_RL(&bad_ofmsg_rl, "%s", ds_cstr(&msg));
420 vconn->version = MIN(OFP10_VERSION, oh->version);
421 if (vconn->version < vconn->min_version) {
422 VLOG_WARN_RL(&bad_ofmsg_rl,
423 "%s: version negotiation failed: we support "
424 "versions 0x%02x to 0x%02x inclusive but peer "
425 "supports no later than version 0x%02"PRIx8,
426 vconn->name, vconn->min_version, OFP10_VERSION,
428 vconn->state = VCS_SEND_ERROR;
430 VLOG_DBG("%s: negotiated OpenFlow version 0x%02x "
431 "(we support versions 0x%02x to 0x%02x inclusive, "
432 "peer no later than version 0x%02"PRIx8")",
433 vconn->name, vconn->version, vconn->min_version,
434 OFP10_VERSION, oh->version);
435 vconn->state = VCS_CONNECTED;
440 char *s = ofp_to_string(b->data, b->size, 1);
441 VLOG_WARN_RL(&bad_ofmsg_rl,
442 "%s: received message while expecting hello: %s",
450 if (retval != EAGAIN) {
451 vconn->state = VCS_DISCONNECTED;
452 vconn->error = retval == EOF ? ECONNRESET : retval;
457 vcs_send_error(struct vconn *vconn)
463 snprintf(s, sizeof s, "We support versions 0x%02x to 0x%02x inclusive but "
464 "you support no later than version 0x%02"PRIx8".",
465 vconn->min_version, OFP10_VERSION, vconn->version);
466 b = ofperr_encode_hello(OFPERR_OFPHFC_INCOMPATIBLE,
467 ofperr_domain_from_version(vconn->version), s);
468 retval = do_send(vconn, b);
472 if (retval != EAGAIN) {
473 vconn->state = VCS_DISCONNECTED;
474 vconn->error = retval ? retval : EPROTO;
478 /* Tries to complete the connection on 'vconn'. If 'vconn''s connection is
479 * complete, returns 0 if the connection was successful or a positive errno
480 * value if it failed. If the connection is still in progress, returns
483 vconn_connect(struct vconn *vconn)
485 enum vconn_state last_state;
487 assert(vconn->min_version > 0);
489 last_state = vconn->state;
490 switch (vconn->state) {
492 vcs_connecting(vconn);
496 vcs_send_hello(vconn);
500 vcs_recv_hello(vconn);
507 vcs_send_error(vconn);
510 case VCS_DISCONNECTED:
516 } while (vconn->state != last_state);
521 /* Tries to receive an OpenFlow message from 'vconn'. If successful, stores
522 * the received message into '*msgp' and returns 0. The caller is responsible
523 * for destroying the message with ofpbuf_delete(). On failure, returns a
524 * positive errno value and stores a null pointer into '*msgp'. On normal
525 * connection close, returns EOF.
527 * vconn_recv will not block waiting for a packet to arrive. If no packets
528 * have been received, it returns EAGAIN immediately. */
530 vconn_recv(struct vconn *vconn, struct ofpbuf **msgp)
532 int retval = vconn_connect(vconn);
534 retval = do_recv(vconn, msgp);
540 do_recv(struct vconn *vconn, struct ofpbuf **msgp)
542 int retval = (vconn->class->recv)(vconn, msgp);
544 struct ofp_header *oh;
546 COVERAGE_INC(vconn_received);
547 if (VLOG_IS_DBG_ENABLED()) {
548 char *s = ofp_to_string((*msgp)->data, (*msgp)->size, 1);
549 VLOG_DBG_RL(&ofmsg_rl, "%s: received: %s", vconn->name, s);
553 oh = ofpbuf_at_assert(*msgp, 0, sizeof *oh);
554 if ((oh->version != vconn->version || oh->version == 0)
555 && oh->type != OFPT_HELLO
556 && oh->type != OFPT_ERROR
557 && oh->type != OFPT_ECHO_REQUEST
558 && oh->type != OFPT_ECHO_REPLY
559 && oh->type != OFPT_VENDOR)
561 if (vconn->version == 0) {
562 VLOG_ERR_RL(&bad_ofmsg_rl,
563 "%s: received OpenFlow message type %"PRIu8" "
564 "before version negotiation complete",
565 vconn->name, oh->type);
567 VLOG_ERR_RL(&bad_ofmsg_rl,
568 "%s: received OpenFlow version 0x%02"PRIx8" "
570 vconn->name, oh->version, vconn->version);
572 ofpbuf_delete(*msgp);
582 /* Tries to queue 'msg' for transmission on 'vconn'. If successful, returns 0,
583 * in which case ownership of 'msg' is transferred to the vconn. Success does
584 * not guarantee that 'msg' has been or ever will be delivered to the peer,
585 * only that it has been queued for transmission.
587 * Returns a positive errno value on failure, in which case the caller
588 * retains ownership of 'msg'.
590 * vconn_send will not block. If 'msg' cannot be immediately accepted for
591 * transmission, it returns EAGAIN immediately. */
593 vconn_send(struct vconn *vconn, struct ofpbuf *msg)
595 int retval = vconn_connect(vconn);
597 retval = do_send(vconn, msg);
603 do_send(struct vconn *vconn, struct ofpbuf *msg)
607 assert(msg->size >= sizeof(struct ofp_header));
608 assert(((struct ofp_header *) msg->data)->length == htons(msg->size));
609 if (!VLOG_IS_DBG_ENABLED()) {
610 COVERAGE_INC(vconn_sent);
611 retval = (vconn->class->send)(vconn, msg);
613 char *s = ofp_to_string(msg->data, msg->size, 1);
614 retval = (vconn->class->send)(vconn, msg);
615 if (retval != EAGAIN) {
616 VLOG_DBG_RL(&ofmsg_rl, "%s: sent (%s): %s",
617 vconn->name, strerror(retval), s);
624 /* Same as vconn_send, except that it waits until 'msg' can be transmitted. */
626 vconn_send_block(struct vconn *vconn, struct ofpbuf *msg)
632 while ((retval = vconn_send(vconn, msg)) == EAGAIN) {
634 vconn_run_wait(vconn);
635 vconn_send_wait(vconn);
641 /* Same as vconn_recv, except that it waits until a message is received. */
643 vconn_recv_block(struct vconn *vconn, struct ofpbuf **msgp)
649 while ((retval = vconn_recv(vconn, msgp)) == EAGAIN) {
651 vconn_run_wait(vconn);
652 vconn_recv_wait(vconn);
658 /* Waits until a message with a transaction ID matching 'xid' is recived on
659 * 'vconn'. Returns 0 if successful, in which case the reply is stored in
660 * '*replyp' for the caller to examine and free. Otherwise returns a positive
661 * errno value, or EOF, and sets '*replyp' to null.
663 * 'request' is always destroyed, regardless of the return value. */
665 vconn_recv_xid(struct vconn *vconn, ovs_be32 xid, struct ofpbuf **replyp)
669 struct ofpbuf *reply;
672 error = vconn_recv_block(vconn, &reply);
677 recv_xid = ((struct ofp_header *) reply->data)->xid;
678 if (xid == recv_xid) {
683 VLOG_DBG_RL(&bad_ofmsg_rl, "%s: received reply with xid %08"PRIx32
684 " != expected %08"PRIx32,
685 vconn->name, ntohl(recv_xid), ntohl(xid));
686 ofpbuf_delete(reply);
690 /* Sends 'request' to 'vconn' and blocks until it receives a reply with a
691 * matching transaction ID. Returns 0 if successful, in which case the reply
692 * is stored in '*replyp' for the caller to examine and free. Otherwise
693 * returns a positive errno value, or EOF, and sets '*replyp' to null.
695 * 'request' should be an OpenFlow request that requires a reply. Otherwise,
696 * if there is no reply, this function can end up blocking forever (or until
697 * the peer drops the connection).
699 * 'request' is always destroyed, regardless of the return value. */
701 vconn_transact(struct vconn *vconn, struct ofpbuf *request,
702 struct ofpbuf **replyp)
704 ovs_be32 send_xid = ((struct ofp_header *) request->data)->xid;
708 error = vconn_send_block(vconn, request);
710 ofpbuf_delete(request);
712 return error ? error : vconn_recv_xid(vconn, send_xid, replyp);
715 /* Sends 'request' followed by a barrier request to 'vconn', then blocks until
716 * it receives a reply to the barrier. If successful, stores the reply to
717 * 'request' in '*replyp', if one was received, and otherwise NULL, then
718 * returns 0. Otherwise returns a positive errno value, or EOF, and sets
721 * This function is useful for sending an OpenFlow request that doesn't
722 * ordinarily include a reply but might report an error in special
725 * 'request' is always destroyed, regardless of the return value. */
727 vconn_transact_noreply(struct vconn *vconn, struct ofpbuf *request,
728 struct ofpbuf **replyp)
730 ovs_be32 request_xid;
731 ovs_be32 barrier_xid;
732 struct ofpbuf *barrier;
738 request_xid = ((struct ofp_header *) request->data)->xid;
739 error = vconn_send_block(vconn, request);
741 ofpbuf_delete(request);
746 barrier = ofputil_encode_barrier_request();
747 barrier_xid = ((struct ofp_header *) barrier->data)->xid;
748 error = vconn_send_block(vconn, barrier);
750 ofpbuf_delete(barrier);
759 error = vconn_recv_block(vconn, &msg);
761 ofpbuf_delete(*replyp);
766 msg_xid = ((struct ofp_header *) msg->data)->xid;
767 if (msg_xid == request_xid) {
769 VLOG_WARN_RL(&bad_ofmsg_rl, "%s: duplicate replies with "
770 "xid %08"PRIx32, vconn->name, ntohl(msg_xid));
771 ofpbuf_delete(*replyp);
776 if (msg_xid == barrier_xid) {
779 VLOG_DBG_RL(&bad_ofmsg_rl, "%s: reply with xid %08"PRIx32
780 " != expected %08"PRIx32" or %08"PRIx32,
781 vconn->name, ntohl(msg_xid),
782 ntohl(request_xid), ntohl(barrier_xid));
788 /* vconn_transact_noreply() for a list of "struct ofpbuf"s, sent one by one.
789 * All of the requests on 'requests' are always destroyed, regardless of the
792 vconn_transact_multiple_noreply(struct vconn *vconn, struct list *requests,
793 struct ofpbuf **replyp)
795 struct ofpbuf *request, *next;
797 LIST_FOR_EACH_SAFE (request, next, list_node, requests) {
800 list_remove(&request->list_node);
802 error = vconn_transact_noreply(vconn, request, replyp);
803 if (error || *replyp) {
804 ofpbuf_list_delete(requests);
814 vconn_wait(struct vconn *vconn, enum vconn_wait_type wait)
816 assert(wait == WAIT_CONNECT || wait == WAIT_RECV || wait == WAIT_SEND);
818 switch (vconn->state) {
835 case VCS_DISCONNECTED:
836 poll_immediate_wake();
839 (vconn->class->wait)(vconn, wait);
843 vconn_connect_wait(struct vconn *vconn)
845 vconn_wait(vconn, WAIT_CONNECT);
849 vconn_recv_wait(struct vconn *vconn)
851 vconn_wait(vconn, WAIT_RECV);
855 vconn_send_wait(struct vconn *vconn)
857 vconn_wait(vconn, WAIT_SEND);
860 /* Given 'name', a connection name in the form "TYPE:ARGS", stores the class
861 * named "TYPE" into '*classp' and returns 0. Returns EAFNOSUPPORT and stores
862 * a null pointer into '*classp' if 'name' is in the wrong form or if no such
865 pvconn_lookup_class(const char *name, struct pvconn_class **classp)
869 prefix_len = strcspn(name, ":");
870 if (name[prefix_len] != '\0') {
873 for (i = 0; i < ARRAY_SIZE(pvconn_classes); i++) {
874 struct pvconn_class *class = pvconn_classes[i];
875 if (strlen(class->name) == prefix_len
876 && !memcmp(class->name, name, prefix_len)) {
887 /* Returns 0 if 'name' is a connection name in the form "TYPE:ARGS" and TYPE is
888 * a supported connection type, otherwise EAFNOSUPPORT. */
890 pvconn_verify_name(const char *name)
892 struct pvconn_class *class;
893 return pvconn_lookup_class(name, &class);
896 /* Attempts to start listening for OpenFlow connections. 'name' is a
897 * connection name in the form "TYPE:ARGS", where TYPE is an passive vconn
898 * class's name and ARGS are vconn class-specific.
900 * Returns 0 if successful, otherwise a positive errno value. If successful,
901 * stores a pointer to the new connection in '*pvconnp', otherwise a null
904 pvconn_open(const char *name, struct pvconn **pvconnp, uint8_t dscp)
906 struct pvconn_class *class;
907 struct pvconn *pvconn;
911 check_vconn_classes();
913 /* Look up the class. */
914 error = pvconn_lookup_class(name, &class);
919 /* Call class's "open" function. */
920 suffix_copy = xstrdup(strchr(name, ':') + 1);
921 error = class->listen(name, suffix_copy, &pvconn, dscp);
936 /* Returns the name that was used to open 'pvconn'. The caller must not
937 * modify or free the name. */
939 pvconn_get_name(const struct pvconn *pvconn)
944 /* Closes 'pvconn'. */
946 pvconn_close(struct pvconn *pvconn)
948 if (pvconn != NULL) {
949 char *name = pvconn->name;
950 (pvconn->class->close)(pvconn);
955 /* Tries to accept a new connection on 'pvconn'. If successful, stores the new
956 * connection in '*new_vconn' and returns 0. Otherwise, returns a positive
959 * The new vconn will automatically negotiate an OpenFlow protocol version
960 * acceptable to both peers on the connection. The version negotiated will be
961 * no lower than 'min_version' and no higher than OFP10_VERSION.
963 * pvconn_accept() will not block waiting for a connection. If no connection
964 * is ready to be accepted, it returns EAGAIN immediately. */
966 pvconn_accept(struct pvconn *pvconn, int min_version, struct vconn **new_vconn)
968 int retval = (pvconn->class->accept)(pvconn, new_vconn);
972 assert((*new_vconn)->state != VCS_CONNECTING
973 || (*new_vconn)->class->connect);
974 (*new_vconn)->min_version = min_version;
980 pvconn_wait(struct pvconn *pvconn)
982 (pvconn->class->wait)(pvconn);
985 /* Initializes 'vconn' as a new vconn named 'name', implemented via 'class'.
986 * The initial connection status, supplied as 'connect_status', is interpreted
989 * - 0: 'vconn' is connected. Its 'send' and 'recv' functions may be
990 * called in the normal fashion.
992 * - EAGAIN: 'vconn' is trying to complete a connection. Its 'connect'
993 * function should be called to complete the connection.
995 * - Other positive errno values indicate that the connection failed with
996 * the specified error.
998 * After calling this function, vconn_close() must be used to destroy 'vconn',
999 * otherwise resources will be leaked.
1001 * The caller retains ownership of 'name'. */
1003 vconn_init(struct vconn *vconn, struct vconn_class *class, int connect_status,
1006 vconn->class = class;
1007 vconn->state = (connect_status == EAGAIN ? VCS_CONNECTING
1008 : !connect_status ? VCS_SEND_HELLO
1009 : VCS_DISCONNECTED);
1010 vconn->error = connect_status;
1012 vconn->min_version = 0;
1013 vconn->remote_ip = 0;
1014 vconn->remote_port = 0;
1015 vconn->local_ip = 0;
1016 vconn->local_port = 0;
1017 vconn->name = xstrdup(name);
1018 assert(vconn->state != VCS_CONNECTING || class->connect);
1022 vconn_set_remote_ip(struct vconn *vconn, ovs_be32 ip)
1024 vconn->remote_ip = ip;
1028 vconn_set_remote_port(struct vconn *vconn, ovs_be16 port)
1030 vconn->remote_port = port;
1034 vconn_set_local_ip(struct vconn *vconn, ovs_be32 ip)
1036 vconn->local_ip = ip;
1040 vconn_set_local_port(struct vconn *vconn, ovs_be16 port)
1042 vconn->local_port = port;
1046 pvconn_init(struct pvconn *pvconn, struct pvconn_class *class,
1049 pvconn->class = class;
1050 pvconn->name = xstrdup(name);