2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 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 "stream-provider.h"
21 #include <netinet/in.h>
26 #include "dynamic-string.h"
27 #include "fatal-signal.h"
30 #include "ofp-print.h"
32 #include "openflow/nicira-ext.h"
33 #include "openflow/openflow.h"
35 #include "poll-loop.h"
40 VLOG_DEFINE_THIS_MODULE(stream);
42 COVERAGE_DEFINE(pstream_open);
43 COVERAGE_DEFINE(stream_open);
45 /* State of an active stream.*/
47 SCS_CONNECTING, /* Underlying stream is not connected. */
48 SCS_CONNECTED, /* Connection established. */
49 SCS_DISCONNECTED /* Connection failed or connection closed. */
52 static const struct stream_class *stream_classes[] = {
60 static const struct pstream_class *pstream_classes[] = {
68 /* Check the validity of the stream class structures. */
70 check_stream_classes(void)
75 for (i = 0; i < ARRAY_SIZE(stream_classes); i++) {
76 const struct stream_class *class = stream_classes[i];
77 ovs_assert(class->name != NULL);
78 ovs_assert(class->open != NULL);
79 if (class->close || class->recv || class->send || class->run
80 || class->run_wait || class->wait) {
81 ovs_assert(class->close != NULL);
82 ovs_assert(class->recv != NULL);
83 ovs_assert(class->send != NULL);
84 ovs_assert(class->wait != NULL);
86 /* This class delegates to another one. */
90 for (i = 0; i < ARRAY_SIZE(pstream_classes); i++) {
91 const struct pstream_class *class = pstream_classes[i];
92 ovs_assert(class->name != NULL);
93 ovs_assert(class->listen != NULL);
94 if (class->close || class->accept || class->wait) {
95 ovs_assert(class->close != NULL);
96 ovs_assert(class->accept != NULL);
97 ovs_assert(class->wait != NULL);
99 /* This class delegates to another one. */
105 /* Prints information on active (if 'active') and passive (if 'passive')
106 * connection methods supported by the stream. */
108 stream_usage(const char *name, bool active, bool passive,
109 bool bootstrap OVS_UNUSED)
111 /* Really this should be implemented via callbacks into the stream
112 * providers, but that seems too heavy-weight to bother with at the
117 printf("Active %s connection methods:\n", name);
118 printf(" tcp:IP:PORT "
119 "PORT at remote IP\n");
121 printf(" ssl:IP:PORT "
122 "SSL PORT at remote IP\n");
125 "Unix domain socket named FILE\n");
129 printf("Passive %s connection methods:\n", name);
130 printf(" ptcp:PORT[:IP] "
131 "listen to TCP PORT on IP\n");
133 printf(" pssl:PORT[:IP] "
134 "listen for SSL on PORT on IP\n");
136 printf(" punix:FILE "
137 "listen on Unix domain socket FILE\n");
141 printf("PKI configuration (required to use SSL):\n"
142 " -p, --private-key=FILE file with private key\n"
143 " -c, --certificate=FILE file with certificate for private key\n"
144 " -C, --ca-cert=FILE file with peer CA certificate\n");
146 printf(" --bootstrap-ca-cert=FILE file with peer CA certificate "
147 "to read or create\n");
152 /* Given 'name', a stream name in the form "TYPE:ARGS", stores the class
153 * named "TYPE" into '*classp' and returns 0. Returns EAFNOSUPPORT and stores
154 * a null pointer into '*classp' if 'name' is in the wrong form or if no such
157 stream_lookup_class(const char *name, const struct stream_class **classp)
162 check_stream_classes();
165 prefix_len = strcspn(name, ":");
166 if (name[prefix_len] == '\0') {
169 for (i = 0; i < ARRAY_SIZE(stream_classes); i++) {
170 const struct stream_class *class = stream_classes[i];
171 if (strlen(class->name) == prefix_len
172 && !memcmp(class->name, name, prefix_len)) {
180 /* Returns 0 if 'name' is a stream name in the form "TYPE:ARGS" and TYPE is
181 * a supported stream type, otherwise EAFNOSUPPORT. */
183 stream_verify_name(const char *name)
185 const struct stream_class *class;
186 return stream_lookup_class(name, &class);
189 /* Attempts to connect a stream to a remote peer. 'name' is a connection name
190 * in the form "TYPE:ARGS", where TYPE is an active stream class's name and
191 * ARGS are stream class-specific.
193 * Returns 0 if successful, otherwise a positive errno value. If successful,
194 * stores a pointer to the new connection in '*streamp', otherwise a null
197 stream_open(const char *name, struct stream **streamp, uint8_t dscp)
199 const struct stream_class *class;
200 struct stream *stream;
204 COVERAGE_INC(stream_open);
206 /* Look up the class. */
207 error = stream_lookup_class(name, &class);
212 /* Call class's "open" function. */
213 suffix_copy = xstrdup(strchr(name, ':') + 1);
214 error = class->open(name, suffix_copy, &stream, dscp);
229 /* Blocks until a previously started stream connection attempt succeeds or
230 * fails. 'error' should be the value returned by stream_open() and 'streamp'
231 * should point to the stream pointer set by stream_open(). Returns 0 if
232 * successful, otherwise a positive errno value other than EAGAIN or
233 * EINPROGRESS. If successful, leaves '*streamp' untouched; on error, closes
234 * '*streamp' and sets '*streamp' to null.
237 * error = stream_open_block(stream_open("tcp:1.2.3.4:5", &stream), &stream);
240 stream_open_block(int error, struct stream **streamp)
242 struct stream *stream = *streamp;
247 while ((error = stream_connect(stream)) == EAGAIN) {
249 stream_run_wait(stream);
250 stream_connect_wait(stream);
253 ovs_assert(error != EINPROGRESS);
257 stream_close(stream);
265 /* Closes 'stream'. */
267 stream_close(struct stream *stream)
269 if (stream != NULL) {
270 char *name = stream->name;
271 (stream->class->close)(stream);
276 /* Returns the name of 'stream', that is, the string passed to
279 stream_get_name(const struct stream *stream)
281 return stream ? stream->name : "(null)";
285 scs_connecting(struct stream *stream)
287 int retval = (stream->class->connect)(stream);
288 ovs_assert(retval != EINPROGRESS);
290 stream->state = SCS_CONNECTED;
291 } else if (retval != EAGAIN) {
292 stream->state = SCS_DISCONNECTED;
293 stream->error = retval;
297 /* Tries to complete the connection on 'stream'. If 'stream''s connection is
298 * complete, returns 0 if the connection was successful or a positive errno
299 * value if it failed. If the connection is still in progress, returns
302 stream_connect(struct stream *stream)
304 enum stream_state last_state;
307 last_state = stream->state;
308 switch (stream->state) {
310 scs_connecting(stream);
316 case SCS_DISCONNECTED:
317 return stream->error;
322 } while (stream->state != last_state);
327 /* Tries to receive up to 'n' bytes from 'stream' into 'buffer', and returns:
329 * - If successful, the number of bytes received (between 1 and 'n').
331 * - On error, a negative errno value.
333 * - 0, if the connection has been closed in the normal fashion, or if 'n'
336 * The recv function will not block waiting for a packet to arrive. If no
337 * data have been received, it returns -EAGAIN immediately. */
339 stream_recv(struct stream *stream, void *buffer, size_t n)
341 int retval = stream_connect(stream);
342 return (retval ? -retval
344 : (stream->class->recv)(stream, buffer, n));
347 /* Tries to send up to 'n' bytes of 'buffer' on 'stream', and returns:
349 * - If successful, the number of bytes sent (between 1 and 'n'). 0 is
350 * only a valid return value if 'n' is 0.
352 * - On error, a negative errno value.
354 * The send function will not block. If no bytes can be immediately accepted
355 * for transmission, it returns -EAGAIN immediately. */
357 stream_send(struct stream *stream, const void *buffer, size_t n)
359 int retval = stream_connect(stream);
360 return (retval ? -retval
362 : (stream->class->send)(stream, buffer, n));
365 /* Allows 'stream' to perform maintenance activities, such as flushing
368 stream_run(struct stream *stream)
370 if (stream->class->run) {
371 (stream->class->run)(stream);
375 /* Arranges for the poll loop to wake up when 'stream' needs to perform
376 * maintenance activities. */
378 stream_run_wait(struct stream *stream)
380 if (stream->class->run_wait) {
381 (stream->class->run_wait)(stream);
385 /* Arranges for the poll loop to wake up when 'stream' is ready to take an
386 * action of the given 'type'. */
388 stream_wait(struct stream *stream, enum stream_wait_type wait)
390 ovs_assert(wait == STREAM_CONNECT || wait == STREAM_RECV
391 || wait == STREAM_SEND);
393 switch (stream->state) {
395 wait = STREAM_CONNECT;
398 case SCS_DISCONNECTED:
399 poll_immediate_wake();
402 (stream->class->wait)(stream, wait);
406 stream_connect_wait(struct stream *stream)
408 stream_wait(stream, STREAM_CONNECT);
412 stream_recv_wait(struct stream *stream)
414 stream_wait(stream, STREAM_RECV);
418 stream_send_wait(struct stream *stream)
420 stream_wait(stream, STREAM_SEND);
423 /* Given 'name', a pstream name in the form "TYPE:ARGS", stores the class
424 * named "TYPE" into '*classp' and returns 0. Returns EAFNOSUPPORT and stores
425 * a null pointer into '*classp' if 'name' is in the wrong form or if no such
428 pstream_lookup_class(const char *name, const struct pstream_class **classp)
433 check_stream_classes();
436 prefix_len = strcspn(name, ":");
437 if (name[prefix_len] == '\0') {
440 for (i = 0; i < ARRAY_SIZE(pstream_classes); i++) {
441 const struct pstream_class *class = pstream_classes[i];
442 if (strlen(class->name) == prefix_len
443 && !memcmp(class->name, name, prefix_len)) {
451 /* Returns 0 if 'name' is a pstream name in the form "TYPE:ARGS" and TYPE is
452 * a supported pstream type, otherwise EAFNOSUPPORT. */
454 pstream_verify_name(const char *name)
456 const struct pstream_class *class;
457 return pstream_lookup_class(name, &class);
460 /* Returns 1 if the stream or pstream specified by 'name' needs periodic probes
461 * to verify connectivity. For [p]streams which need probes, it can take a
462 * long time to notice the connection has been dropped. Returns 0 if the
463 * stream or pstream does not need probes, and -1 if 'name' is not valid. */
465 stream_or_pstream_needs_probes(const char *name)
467 const struct pstream_class *pclass;
468 const struct stream_class *class;
470 if (!stream_lookup_class(name, &class)) {
471 return class->needs_probes;
472 } else if (!pstream_lookup_class(name, &pclass)) {
473 return pclass->needs_probes;
479 /* Attempts to start listening for remote stream connections. 'name' is a
480 * connection name in the form "TYPE:ARGS", where TYPE is an passive stream
481 * class's name and ARGS are stream class-specific.
483 * Returns 0 if successful, otherwise a positive errno value. If successful,
484 * stores a pointer to the new connection in '*pstreamp', otherwise a null
487 pstream_open(const char *name, struct pstream **pstreamp, uint8_t dscp)
489 const struct pstream_class *class;
490 struct pstream *pstream;
494 COVERAGE_INC(pstream_open);
496 /* Look up the class. */
497 error = pstream_lookup_class(name, &class);
502 /* Call class's "open" function. */
503 suffix_copy = xstrdup(strchr(name, ':') + 1);
504 error = class->listen(name, suffix_copy, &pstream, dscp);
519 /* Returns the name that was used to open 'pstream'. The caller must not
520 * modify or free the name. */
522 pstream_get_name(const struct pstream *pstream)
524 return pstream->name;
527 /* Closes 'pstream'. */
529 pstream_close(struct pstream *pstream)
531 if (pstream != NULL) {
532 char *name = pstream->name;
533 (pstream->class->close)(pstream);
538 /* Tries to accept a new connection on 'pstream'. If successful, stores the
539 * new connection in '*new_stream' and returns 0. Otherwise, returns a
540 * positive errno value.
542 * pstream_accept() will not block waiting for a connection. If no connection
543 * is ready to be accepted, it returns EAGAIN immediately. */
545 pstream_accept(struct pstream *pstream, struct stream **new_stream)
547 int retval = (pstream->class->accept)(pstream, new_stream);
551 ovs_assert((*new_stream)->state != SCS_CONNECTING
552 || (*new_stream)->class->connect);
557 /* Tries to accept a new connection on 'pstream'. If successful, stores the
558 * new connection in '*new_stream' and returns 0. Otherwise, returns a
559 * positive errno value.
561 * pstream_accept_block() blocks until a connection is ready or until an error
562 * occurs. It will not return EAGAIN. */
564 pstream_accept_block(struct pstream *pstream, struct stream **new_stream)
569 while ((error = pstream_accept(pstream, new_stream)) == EAGAIN) {
570 pstream_wait(pstream);
580 pstream_wait(struct pstream *pstream)
582 (pstream->class->wait)(pstream);
586 pstream_set_dscp(struct pstream *pstream, uint8_t dscp)
588 if (pstream->class->set_dscp) {
589 return pstream->class->set_dscp(pstream, dscp);
594 /* Returns the transport port on which 'pstream' is listening, or 0 if the
595 * concept doesn't apply. */
597 pstream_get_bound_port(const struct pstream *pstream)
599 return pstream->bound_port;
602 /* Initializes 'stream' as a new stream named 'name', implemented via 'class'.
603 * The initial connection status, supplied as 'connect_status', is interpreted
606 * - 0: 'stream' is connected. Its 'send' and 'recv' functions may be
607 * called in the normal fashion.
609 * - EAGAIN: 'stream' is trying to complete a connection. Its 'connect'
610 * function should be called to complete the connection.
612 * - Other positive errno values indicate that the connection failed with
613 * the specified error.
615 * After calling this function, stream_close() must be used to destroy
616 * 'stream', otherwise resources will be leaked.
618 * The caller retains ownership of 'name'. */
620 stream_init(struct stream *stream, const struct stream_class *class,
621 int connect_status, const char *name)
623 memset(stream, 0, sizeof *stream);
624 stream->class = class;
625 stream->state = (connect_status == EAGAIN ? SCS_CONNECTING
626 : !connect_status ? SCS_CONNECTED
628 stream->error = connect_status;
629 stream->name = xstrdup(name);
630 ovs_assert(stream->state != SCS_CONNECTING || class->connect);
634 pstream_init(struct pstream *pstream, const struct pstream_class *class,
637 memset(pstream, 0, sizeof *pstream);
638 pstream->class = class;
639 pstream->name = xstrdup(name);
643 pstream_set_bound_port(struct pstream *pstream, ovs_be16 port)
645 pstream->bound_port = port;
649 count_fields(const char *s_)
651 char *s, *field, *save_ptr;
656 for (field = strtok_r(s, ":", &save_ptr); field != NULL;
657 field = strtok_r(NULL, ":", &save_ptr)) {
665 /* Like stream_open(), but the port defaults to 'default_port' if no port
666 * number is given. */
668 stream_open_with_default_port(const char *name_,
669 uint16_t default_port,
670 struct stream **streamp,
676 if ((!strncmp(name_, "tcp:", 4) || !strncmp(name_, "ssl:", 4))
677 && count_fields(name_) < 3) {
678 if (default_port == OFP_OLD_PORT) {
679 VLOG_WARN_ONCE("The default OpenFlow port number will change "
680 "from %d to %d in a future release",
681 OFP_OLD_PORT, OFP_PORT);
682 } else if (default_port == OVSDB_OLD_PORT) {
683 VLOG_WARN_ONCE("The default OVSDB port number will change "
684 "from %d to %d in a future release",
685 OVSDB_OLD_PORT, OVSDB_PORT);
687 name = xasprintf("%s:%d", name_, default_port);
689 name = xstrdup(name_);
691 error = stream_open(name, streamp, dscp);
697 /* Like pstream_open(), but port defaults to 'default_port' if no port
698 * number is given. */
700 pstream_open_with_default_port(const char *name_,
701 uint16_t default_port,
702 struct pstream **pstreamp,
708 if ((!strncmp(name_, "ptcp:", 5) || !strncmp(name_, "pssl:", 5))
709 && count_fields(name_) < 2) {
710 name = xasprintf("%s%d", name_, default_port);
712 name = xstrdup(name_);
714 error = pstream_open(name, pstreamp, dscp);
721 * This function extracts IP address and port from the target string.
723 * - On success, function returns true and fills *sin structure with port
724 * and IP address. If port was absent in target string then it will use
725 * corresponding default port value.
726 * - On error, function returns false and *sin contains garbage.
729 stream_parse_target_with_default_port(const char *target,
730 uint16_t default_port,
731 struct sockaddr_in *sin)
733 return ((!strncmp(target, "tcp:", 4) || !strncmp(target, "ssl:", 4))
734 && inet_parse_active(target + 4, default_port, sin));
737 /* Attempts to guess the content type of a stream whose first few bytes were
738 * the 'size' bytes of 'data'. */
739 static enum stream_content_type
740 stream_guess_content(const uint8_t *data, ssize_t size)
743 #define PAIR(A, B) (((A) << 8) | (B))
744 switch (PAIR(data[0], data[1])) {
745 case PAIR(0x16, 0x03): /* Handshake, version 3. */
748 return STREAM_JSONRPC;
749 case PAIR(OFP10_VERSION, 0 /* OFPT_HELLO */):
750 return STREAM_OPENFLOW;
754 return STREAM_UNKNOWN;
757 /* Returns a string represenation of 'type'. */
759 stream_content_type_to_string(enum stream_content_type type)
769 case STREAM_OPENFLOW:
777 /* Attempts to guess the content type of a stream whose first few bytes were
778 * the 'size' bytes of 'data'. If this is done successfully, and the guessed
779 * content type is other than 'expected_type', then log a message in vlog
780 * module 'module', naming 'stream_name' as the source, explaining what
781 * content was expected and what was actually received. */
783 stream_report_content(const void *data, ssize_t size,
784 enum stream_content_type expected_type,
785 struct vlog_module *module, const char *stream_name)
787 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);
788 enum stream_content_type actual_type;
790 actual_type = stream_guess_content(data, size);
791 if (actual_type != expected_type && actual_type != STREAM_UNKNOWN) {
792 vlog_rate_limit(module, VLL_WARN, &rl,
793 "%s: received %s data on %s channel",
795 stream_content_type_to_string(actual_type),
796 stream_content_type_to_string(expected_type));