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.
39 #include <netinet/in.h>
44 #include "command-line.h"
48 #include "discovery.h"
50 #include "fail-open.h"
57 #include "port-watcher.h"
58 #include "poll-loop.h"
59 #include "ratelimit.h"
64 #include "stp-secchan.h"
68 #include "vconn-ssl.h"
70 #include "vlog-socket.h"
73 #define THIS_MODULE VLM_secchan
76 const struct hook_class *class;
82 size_t n_hooks, allocated_hooks;
85 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60);
87 static void parse_options(int argc, char *argv[], struct settings *);
88 static void usage(void) NO_RETURN;
90 static struct pvconn *open_passive_vconn(const char *name);
91 static struct vconn *accept_vconn(struct pvconn *pvconn);
93 static struct relay *relay_create(struct rconn *local, struct rconn *remote,
95 static struct relay *relay_accept(const struct settings *, struct pvconn *);
96 static void relay_run(struct relay *, struct secchan *);
97 static void relay_wait(struct relay *);
98 static void relay_destroy(struct relay *);
101 main(int argc, char *argv[])
105 struct list relays = LIST_INITIALIZER(&relays);
107 struct secchan secchan;
109 struct pvconn *monitor;
111 struct pvconn *listeners[MAX_MGMT];
114 struct rconn *local_rconn, *remote_rconn;
115 struct relay *controller_relay;
116 struct discovery *discovery;
117 struct switch_status *switch_status;
118 struct port_watcher *pw;
122 set_program_name(argv[0]);
123 register_fault_handlers();
126 parse_options(argc, argv, &s);
127 signal(SIGPIPE, SIG_IGN);
129 secchan.hooks = NULL;
131 secchan.allocated_hooks = 0;
133 /* Start listening for management and monitoring connections. */
135 for (i = 0; i < s.n_listeners; i++) {
136 listeners[n_listeners++] = open_passive_vconn(s.listener_names[i]);
138 monitor = s.monitor_name ? open_passive_vconn(s.monitor_name) : NULL;
140 /* Initialize switch status hook. */
141 switch_status_start(&secchan, &s, &switch_status);
143 /* Start listening for vlogconf requests. */
144 retval = vlog_server_listen(NULL, NULL);
146 ofp_fatal(retval, "Could not listen for vlog connections");
149 die_if_already_running();
152 VLOG_WARN("OpenFlow reference implementation version %s", VERSION);
153 VLOG_WARN("OpenFlow protocol version 0x%02x", OFP_VERSION);
155 /* Connect to datapath. */
156 local_rconn = rconn_create(0, s.max_backoff);
157 rconn_connect(local_rconn, s.dp_name);
158 switch_status_register_category(switch_status, "local",
159 rconn_status_cb, local_rconn);
161 /* Connect to controller. */
162 remote_rconn = rconn_create(s.probe_interval, s.max_backoff);
163 if (s.controller_name) {
164 retval = rconn_connect(remote_rconn, s.controller_name);
165 if (retval == EAFNOSUPPORT) {
166 ofp_fatal(0, "No support for %s vconn", s.controller_name);
169 switch_status_register_category(switch_status, "remote",
170 rconn_status_cb, remote_rconn);
172 /* Start relaying. */
173 controller_relay = relay_create(local_rconn, remote_rconn, false);
174 list_push_back(&relays, &controller_relay->node);
177 port_watcher_start(&secchan, local_rconn, remote_rconn, &pw);
178 discovery = s.discovery ? discovery_init(&s, pw, switch_status) : NULL;
180 snat_start(&secchan, pw);
183 stp_start(&secchan, &s, pw, local_rconn, remote_rconn);
186 in_band_start(&secchan, &s, switch_status, pw, remote_rconn);
188 if (s.fail_mode == FAIL_OPEN) {
189 fail_open_start(&secchan, &s, switch_status,
190 local_rconn, remote_rconn);
193 rate_limit_start(&secchan, &s, switch_status,
194 local_rconn, remote_rconn);
196 if (s.command_acl[0]) {
197 executer_start(&secchan, &s);
205 LIST_FOR_EACH_SAFE (r, n, struct relay, node, &relays) {
206 relay_run(r, &secchan);
208 for (i = 0; i < n_listeners; i++) {
210 struct relay *r = relay_accept(&s, listeners[i]);
214 list_push_back(&relays, &r->node);
218 struct vconn *new = accept_vconn(monitor);
220 rconn_add_monitor(local_rconn, new);
223 for (i = 0; i < secchan.n_hooks; i++) {
224 if (secchan.hooks[i].class->periodic_cb) {
225 secchan.hooks[i].class->periodic_cb(secchan.hooks[i].aux);
229 char *controller_name;
230 if (rconn_is_connectivity_questionable(remote_rconn)) {
231 discovery_question_connectivity(discovery);
233 if (discovery_run(discovery, &controller_name)) {
234 if (controller_name) {
235 rconn_connect(remote_rconn, controller_name);
237 rconn_disconnect(remote_rconn);
242 /* Wait for something to happen. */
243 LIST_FOR_EACH (r, struct relay, node, &relays) {
246 for (i = 0; i < n_listeners; i++) {
247 pvconn_wait(listeners[i]);
250 pvconn_wait(monitor);
252 for (i = 0; i < secchan.n_hooks; i++) {
253 if (secchan.hooks[i].class->wait_cb) {
254 secchan.hooks[i].class->wait_cb(secchan.hooks[i].aux);
258 discovery_wait(discovery);
266 static struct pvconn *
267 open_passive_vconn(const char *name)
269 struct pvconn *pvconn;
272 retval = pvconn_open(name, &pvconn);
273 if (retval && retval != EAGAIN) {
274 ofp_fatal(retval, "opening %s", name);
279 static struct vconn *
280 accept_vconn(struct pvconn *pvconn)
285 retval = pvconn_accept(pvconn, OFP_VERSION, &new);
286 if (retval && retval != EAGAIN) {
287 VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval));
293 add_hook(struct secchan *secchan, const struct hook_class *class, void *aux)
297 if (secchan->n_hooks >= secchan->allocated_hooks) {
298 secchan->allocated_hooks = secchan->allocated_hooks * 2 + 1;
299 secchan->hooks = xrealloc(secchan->hooks,
300 (sizeof *secchan->hooks
301 * secchan->allocated_hooks));
303 hook = &secchan->hooks[secchan->n_hooks++];
308 struct ofp_packet_in *
309 get_ofp_packet_in(struct relay *r)
311 struct ofpbuf *msg = r->halves[HALF_LOCAL].rxbuf;
312 struct ofp_header *oh = msg->data;
313 if (oh->type == OFPT_PACKET_IN) {
314 if (msg->size >= offsetof (struct ofp_packet_in, data)) {
317 VLOG_WARN("packet too short (%zu bytes) for packet_in",
325 get_ofp_packet_eth_header(struct relay *r, struct ofp_packet_in **opip,
326 struct eth_header **ethp)
328 const int min_len = offsetof(struct ofp_packet_in, data) + ETH_HEADER_LEN;
329 struct ofp_packet_in *opi = get_ofp_packet_in(r);
330 if (opi && ntohs(opi->header.length) >= min_len) {
332 *ethp = (void *) opi->data;
338 /* OpenFlow message relaying. */
340 static struct relay *
341 relay_accept(const struct settings *s, struct pvconn *pvconn)
343 struct vconn *new_remote, *new_local;
344 struct rconn *r1, *r2;
349 new_remote = accept_vconn(pvconn);
354 if (sscanf(s->dp_name, "nl:%d", &nl_index) == 1) {
355 /* nl:123 or nl:123:1 opens a netlink connection to local datapath 123.
356 * nl:123:0 opens a netlink connection to local datapath 123 without
357 * obtaining a subscription for ofp_packet_in or ofp_flow_expired
358 * messages. That's what we want here; management connections should
359 * not receive those messages, at least by default. */
360 vconn_name = xasprintf("nl:%d:0", nl_index);
362 /* We don't have a way to specify not to subscribe to those messages
363 * for other transports. (That's a defect: really this should be in
364 * the OpenFlow protocol, not the Netlink transport). */
365 VLOG_WARN_RL(&rl, "new management connection will receive "
366 "asynchronous messages");
367 vconn_name = xstrdup(s->dp_name);
370 retval = vconn_open(vconn_name, OFP_VERSION, &new_local);
372 VLOG_ERR_RL(&rl, "could not connect to %s (%s)",
373 vconn_name, strerror(retval));
374 vconn_close(new_remote);
379 /* Create and return relay. */
380 r1 = rconn_create(0, 0);
381 rconn_connect_unreliably(r1, vconn_name, new_local);
384 r2 = rconn_create(0, 0);
385 rconn_connect_unreliably(r2, "passive", new_remote);
387 return relay_create(r1, r2, true);
390 static struct relay *
391 relay_create(struct rconn *local, struct rconn *remote, bool is_mgmt_conn)
393 struct relay *r = xcalloc(1, sizeof *r);
394 r->halves[HALF_LOCAL].rconn = local;
395 r->halves[HALF_REMOTE].rconn = remote;
396 r->is_mgmt_conn = is_mgmt_conn;
401 call_local_packet_cbs(struct secchan *secchan, struct relay *r)
403 const struct hook *h;
404 for (h = secchan->hooks; h < &secchan->hooks[secchan->n_hooks]; h++) {
405 bool (*cb)(struct relay *, void *aux) = h->class->local_packet_cb;
406 if (cb && (cb)(r, h->aux)) {
414 call_remote_packet_cbs(struct secchan *secchan, struct relay *r)
416 const struct hook *h;
417 for (h = secchan->hooks; h < &secchan->hooks[secchan->n_hooks]; h++) {
418 bool (*cb)(struct relay *, void *aux) = h->class->remote_packet_cb;
419 if (cb && (cb)(r, h->aux)) {
427 relay_run(struct relay *r, struct secchan *secchan)
432 for (i = 0; i < 2; i++) {
433 rconn_run(r->halves[i].rconn);
436 /* Limit the number of iterations to prevent other tasks from starving. */
437 for (iteration = 0; iteration < 50; iteration++) {
438 bool progress = false;
439 for (i = 0; i < 2; i++) {
440 struct half *this = &r->halves[i];
441 struct half *peer = &r->halves[!i];
444 this->rxbuf = rconn_recv(this->rconn);
445 if (this->rxbuf && (i == HALF_REMOTE || !r->is_mgmt_conn)) {
447 ? call_local_packet_cbs(secchan, r)
448 : call_remote_packet_cbs(secchan, r))
450 ofpbuf_delete(this->rxbuf);
458 if (this->rxbuf && !this->n_txq) {
459 int retval = rconn_send(peer->rconn, this->rxbuf,
461 if (retval != EAGAIN) {
465 ofpbuf_delete(this->rxbuf);
476 if (r->is_mgmt_conn) {
477 for (i = 0; i < 2; i++) {
478 struct half *this = &r->halves[i];
479 if (!rconn_is_alive(this->rconn)) {
488 relay_wait(struct relay *r)
492 for (i = 0; i < 2; i++) {
493 struct half *this = &r->halves[i];
495 rconn_run_wait(this->rconn);
497 rconn_recv_wait(this->rconn);
503 relay_destroy(struct relay *r)
507 list_remove(&r->node);
508 for (i = 0; i < 2; i++) {
509 struct half *this = &r->halves[i];
510 rconn_destroy(this->rconn);
511 ofpbuf_delete(this->rxbuf);
516 /* User interface. */
519 parse_options(int argc, char *argv[], struct settings *s)
522 OPT_ACCEPT_VCONN = UCHAR_MAX + 1,
524 OPT_INACTIVITY_PROBE,
529 OPT_BOOTSTRAP_CA_CERT,
538 static struct option long_options[] = {
539 {"accept-vconn", required_argument, 0, OPT_ACCEPT_VCONN},
540 {"no-resolv-conf", no_argument, 0, OPT_NO_RESOLV_CONF},
541 {"fail", required_argument, 0, 'F'},
542 {"inactivity-probe", required_argument, 0, OPT_INACTIVITY_PROBE},
543 {"max-idle", required_argument, 0, OPT_MAX_IDLE},
544 {"max-backoff", required_argument, 0, OPT_MAX_BACKOFF},
545 {"listen", required_argument, 0, 'l'},
546 {"monitor", required_argument, 0, 'm'},
547 {"rate-limit", optional_argument, 0, OPT_RATE_LIMIT},
548 {"burst-limit", required_argument, 0, OPT_BURST_LIMIT},
549 {"stp", no_argument, 0, OPT_STP},
550 {"no-stp", no_argument, 0, OPT_NO_STP},
551 {"out-of-band", no_argument, 0, OPT_OUT_OF_BAND},
552 {"in-band", no_argument, 0, OPT_IN_BAND},
553 {"command-acl", required_argument, 0, OPT_COMMAND_ACL},
554 {"command-dir", required_argument, 0, OPT_COMMAND_DIR},
555 {"verbose", optional_argument, 0, 'v'},
556 {"help", no_argument, 0, 'h'},
557 {"version", no_argument, 0, 'V'},
561 VCONN_SSL_LONG_OPTIONS
562 {"bootstrap-ca-cert", required_argument, 0, OPT_BOOTSTRAP_CA_CERT},
566 char *short_options = long_options_to_short_options(long_options);
567 char *accept_re = NULL;
570 /* Set defaults that we can figure out before parsing options. */
572 s->monitor_name = NULL;
573 s->fail_mode = FAIL_OPEN;
575 s->probe_interval = 15;
577 s->update_resolv_conf = true;
580 s->enable_stp = false;
583 s->command_dir = xasprintf("%s/commands", ofp_pkgdatadir);
587 c = getopt_long(argc, argv, short_options, long_options, NULL);
593 case OPT_ACCEPT_VCONN:
594 accept_re = optarg[0] == '^' ? optarg : xasprintf("^%s", optarg);
597 case OPT_NO_RESOLV_CONF:
598 s->update_resolv_conf = false;
602 if (!strcmp(optarg, "open")) {
603 s->fail_mode = FAIL_OPEN;
604 } else if (!strcmp(optarg, "closed")) {
605 s->fail_mode = FAIL_CLOSED;
607 ofp_fatal(0, "-f or --fail argument must be \"open\" "
612 case OPT_INACTIVITY_PROBE:
613 s->probe_interval = atoi(optarg);
614 if (s->probe_interval < 5) {
615 ofp_fatal(0, "--inactivity-probe argument must be at least 5");
620 if (!strcmp(optarg, "permanent")) {
621 s->max_idle = OFP_FLOW_PERMANENT;
623 s->max_idle = atoi(optarg);
624 if (s->max_idle < 1 || s->max_idle > 65535) {
625 ofp_fatal(0, "--max-idle argument must be between 1 and "
626 "65535 or the word 'permanent'");
631 case OPT_MAX_BACKOFF:
632 s->max_backoff = atoi(optarg);
633 if (s->max_backoff < 1) {
634 ofp_fatal(0, "--max-backoff argument must be at least 1");
635 } else if (s->max_backoff > 3600) {
636 s->max_backoff = 3600;
642 s->rate_limit = atoi(optarg);
643 if (s->rate_limit < 1) {
644 ofp_fatal(0, "--rate-limit argument must be at least 1");
647 s->rate_limit = 1000;
651 case OPT_BURST_LIMIT:
652 s->burst_limit = atoi(optarg);
653 if (s->burst_limit < 1) {
654 ofp_fatal(0, "--burst-limit argument must be at least 1");
659 s->enable_stp = true;
663 s->enable_stp = false;
666 case OPT_OUT_OF_BAND:
674 case OPT_COMMAND_ACL:
675 s->command_acl = (s->command_acl[0]
676 ? xasprintf("%s,%s", s->command_acl, optarg)
680 case OPT_COMMAND_DIR:
681 s->command_dir = optarg;
685 if (s->n_listeners >= MAX_MGMT) {
687 "-l or --listen may be specified at most %d times",
690 s->listener_names[s->n_listeners++] = optarg;
694 if (s->monitor_name) {
695 ofp_fatal(0, "-m or --monitor may only be specified once");
697 s->monitor_name = optarg;
704 printf("%s "VERSION" compiled "__DATE__" "__TIME__"\n", argv[0]);
707 DAEMON_OPTION_HANDLERS
712 VCONN_SSL_OPTION_HANDLERS
714 case OPT_BOOTSTRAP_CA_CERT:
715 vconn_ssl_set_ca_cert_file(optarg, true);
730 if (argc < 1 || argc > 2) {
731 ofp_fatal(0, "need one or two non-option arguments; "
732 "use --help for usage");
735 /* Local and remote vconns. */
736 s->dp_name = argv[0];
737 s->controller_name = argc > 1 ? xstrdup(argv[1]) : NULL;
739 /* Set accept_controller_regex. */
741 accept_re = vconn_ssl_is_configured() ? "^ssl:.*" : ".*";
743 retval = regcomp(&s->accept_controller_regex, accept_re,
744 REG_NOSUB | REG_EXTENDED);
746 size_t length = regerror(retval, &s->accept_controller_regex, NULL, 0);
747 char *buffer = xmalloc(length);
748 regerror(retval, &s->accept_controller_regex, buffer, length);
749 ofp_fatal(0, "%s: %s", accept_re, buffer);
751 s->accept_controller_re = accept_re;
753 /* Mode of operation. */
754 s->discovery = s->controller_name == NULL;
755 if (s->discovery && !s->in_band) {
756 ofp_fatal(0, "Cannot perform discovery with out-of-band control");
761 if (s->rate_limit < 100) {
762 VLOG_WARN("Rate limit set to unusually low value %d",
765 if (!s->burst_limit) {
766 s->burst_limit = s->rate_limit / 4;
768 s->burst_limit = MAX(s->burst_limit, 1);
769 s->burst_limit = MIN(s->burst_limit, INT_MAX / 1000);
776 printf("%s: secure channel, a relay for OpenFlow messages.\n"
777 "usage: %s [OPTIONS] nl:DP_IDX [CONTROLLER]\n"
778 "where nl:DP_IDX is a datapath that has been added with dpctl.\n"
779 "CONTROLLER is an active OpenFlow connection method; if it is\n"
780 "omitted, then secchan performs controller discovery.\n",
781 program_name, program_name);
782 vconn_usage(true, true, true);
783 printf("\nController discovery options:\n"
784 " --accept-vconn=REGEX accept matching discovered controllers\n"
785 " --no-resolv-conf do not update /etc/resolv.conf\n"
786 "\nNetworking options:\n"
787 " -F, --fail=open|closed when controller connection fails:\n"
788 " closed: drop all packets\n"
789 " open (default): act as learning switch\n"
790 " --inactivity-probe=SECS time between inactivity probes\n"
791 " --max-idle=SECS max idle for flows set up by secchan\n"
792 " --max-backoff=SECS max time between controller connection\n"
793 " attempts (default: 15 seconds)\n"
794 " -l, --listen=METHOD allow management connections on METHOD\n"
795 " (a passive OpenFlow connection method)\n"
796 " -m, --monitor=METHOD copy traffic to/from kernel to METHOD\n"
797 " (a passive OpenFlow connection method)\n"
798 " --out-of-band controller connection is out-of-band\n"
799 " --stp enable 802.1D Spanning Tree Protocol\n"
800 " --no-stp disable 802.1D Spanning Tree Protocol\n"
801 "\nRate-limiting of \"packet-in\" messages to the controller:\n"
802 " --rate-limit[=PACKETS] max rate, in packets/s (default: 1000)\n"
803 " --burst-limit=BURST limit on packet credit for idle time\n"
804 "\nRemote command execution options:\n"
805 " --command-acl=[!]GLOB[,[!]GLOB...] set allowed/denied commands\n"
806 " --command-dir=DIR set command dir (default: %s/commands)\n",
810 printf("\nOther options:\n"
811 " -h, --help display this help message\n"
812 " -V, --version display version information\n");