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>
48 #include "command-line.h"
52 #include "dhcp-client.h"
53 #include "dynamic-string.h"
56 #include "learning-switch.h"
58 #include "mac-learning.h"
62 #include "poll-loop.h"
66 #include "vconn-ssl.h"
68 #include "vlog-socket.h"
71 #define THIS_MODULE VLM_secchan
73 /* Behavior when the connection to the controller fails. */
75 FAIL_OPEN, /* Act as learning switch. */
76 FAIL_CLOSED /* Drop all packets. */
79 /* Settings that may be configured by the user. */
81 /* Overall mode of operation. */
82 bool discovery; /* Discover the controller automatically? */
83 bool in_band; /* Connect to controller in-band? */
85 /* Related vconns and network devices. */
86 const char *nl_name; /* Local datapath (must be "nl:" vconn). */
87 char *of_name; /* ofX network device name. */
88 const char *controller_name; /* Controller (if not discovery mode). */
89 const char *listen_vconn_name; /* Listens for mgmt connections. */
91 /* Failure behavior. */
92 enum fail_mode fail_mode; /* Act as learning switch if no controller? */
93 int max_idle; /* Idle time for flows in fail-open mode. */
94 int probe_interval; /* # seconds idle before sending echo request. */
95 int max_backoff; /* Max # seconds between connection attempts. */
97 /* Discovery behavior. */
98 regex_t accept_controller_regex; /* Controller vconns to accept. */
99 const char *accept_controller_re; /* String version of regex. */
100 bool update_resolv_conf; /* Update /etc/resolv.conf? */
105 struct buffer *rxbuf;
112 #define HALF_REMOTE 1
113 struct half halves[2];
119 bool (*packet_cb)(struct relay *, int half, void *aux);
120 void (*periodic_cb)(void *aux);
124 static void parse_options(int argc, char *argv[], struct settings *);
125 static void usage(void) NO_RETURN;
127 static struct relay *relay_create(struct rconn *local, struct rconn *remote,
129 static struct relay *relay_accept(const struct settings *, struct vconn *);
130 static void relay_run(struct relay *, const struct hook[], size_t n_hooks);
131 static void relay_wait(struct relay *);
132 static void relay_destroy(struct relay *);
134 static struct hook make_hook(bool (*packet_cb)(struct relay *, int, void *),
135 void (*periodic_cb)(void *),
138 static struct discovery *discovery_init(const struct settings *);
139 static void discovery_question_connectivity(struct discovery *);
140 static bool discovery_run(struct discovery *, char **controller_name);
141 static void discovery_wait(struct discovery *);
143 static struct hook in_band_hook_create(const struct settings *);
144 static struct hook fail_open_hook_create(const struct settings *,
146 struct rconn *remote);
148 static void modify_dhcp_request(struct dhcp_msg *, void *aux);
149 static bool validate_dhcp_offer(const struct dhcp_msg *, void *aux);
152 main(int argc, char *argv[])
156 struct list relays = LIST_INITIALIZER(&relays);
158 struct hook hooks[3];
161 struct rconn *local_rconn, *remote_rconn;
162 struct vconn *listen_vconn;
163 struct relay *controller_relay;
164 struct discovery *discovery;
167 set_program_name(argv[0]);
168 register_fault_handlers();
171 parse_options(argc, argv, &s);
173 /* Start listening for management connections. */
174 if (s.listen_vconn_name) {
175 retval = vconn_open(s.listen_vconn_name, &listen_vconn);
176 if (retval && retval != EAGAIN) {
177 fatal(retval, "opening %s", s.listen_vconn_name);
179 if (!vconn_is_passive(listen_vconn)) {
180 fatal(0, "%s is not a passive vconn", s.listen_vconn_name);
186 /* Start controller discovery. */
187 discovery = s.discovery ? discovery_init(&s) : NULL;
189 /* Start listening for vlogconf requests. */
190 retval = vlog_server_listen(NULL, NULL);
192 fatal(retval, "Could not listen for vlog connections");
197 /* Connect to datapath. */
198 local_rconn = rconn_create(1, 0, s.max_backoff);
199 rconn_connect(local_rconn, s.nl_name);
201 /* Connect to controller. */
202 remote_rconn = rconn_create(1, s.probe_interval, s.max_backoff);
203 if (s.controller_name) {
204 retval = rconn_connect(remote_rconn, s.controller_name);
205 if (retval == EAFNOSUPPORT) {
206 fatal(0, "No support for %s vconn", s.controller_name);
210 /* Start relaying. */
211 controller_relay = relay_create(local_rconn, remote_rconn, false);
212 list_push_back(&relays, &controller_relay->node);
217 hooks[n_hooks++] = in_band_hook_create(&s);
219 if (s.fail_mode == FAIL_OPEN) {
220 hooks[n_hooks++] = fail_open_hook_create(&s,
221 local_rconn, remote_rconn);
223 assert(n_hooks <= ARRAY_SIZE(hooks));
230 LIST_FOR_EACH_SAFE (r, n, struct relay, node, &relays) {
231 relay_run(r, hooks, n_hooks);
235 struct relay *r = relay_accept(&s, listen_vconn);
239 list_push_back(&relays, &r->node);
242 for (i = 0; i < n_hooks; i++) {
243 if (hooks[i].periodic_cb) {
244 hooks[i].periodic_cb(hooks[i].aux);
248 char *controller_name;
249 if (rconn_is_connectivity_questionable(remote_rconn)) {
250 discovery_question_connectivity(discovery);
252 if (discovery_run(discovery, &controller_name)) {
253 if (controller_name) {
254 rconn_connect(remote_rconn, controller_name);
256 rconn_disconnect(remote_rconn);
261 /* Wait for something to happen. */
262 LIST_FOR_EACH (r, struct relay, node, &relays) {
266 vconn_accept_wait(listen_vconn);
269 discovery_wait(discovery);
278 make_hook(bool (*packet_cb)(struct relay *, int half, void *aux),
279 void (*periodic_cb)(void *aux),
283 h.packet_cb = packet_cb;
284 h.periodic_cb = periodic_cb;
289 /* OpenFlow message relaying. */
291 static struct relay *
292 relay_accept(const struct settings *s, struct vconn *listen_vconn)
294 struct vconn *new_remote, *new_local;
295 char *nl_name_without_subscription;
296 struct rconn *r1, *r2;
299 retval = vconn_accept(listen_vconn, &new_remote);
301 if (retval != EAGAIN) {
302 VLOG_WARN("accept failed (%s)", strerror(retval));
307 /* nl:123 or nl:123:1 opens a netlink connection to local datapath 123. We
308 * only accept the former syntax in main().
310 * nl:123:0 opens a netlink connection to local datapath 123 without
311 * obtaining a subscription for ofp_packet_in or ofp_flow_expired
313 nl_name_without_subscription = xasprintf("%s:0", s->nl_name);
314 retval = vconn_open(nl_name_without_subscription, &new_local);
316 VLOG_ERR("could not connect to %s (%s)",
317 nl_name_without_subscription, strerror(retval));
318 vconn_close(new_remote);
319 free(nl_name_without_subscription);
323 /* Create and return relay. */
324 r1 = rconn_create(1, 0, 0);
325 rconn_connect_unreliably(r1, nl_name_without_subscription, new_local);
326 free(nl_name_without_subscription);
328 r2 = rconn_create(1, 0, 0);
329 rconn_connect_unreliably(r2, "passive", new_remote);
331 return relay_create(r1, r2, true);
334 static struct relay *
335 relay_create(struct rconn *local, struct rconn *remote, bool is_mgmt_conn)
340 r = xmalloc(sizeof *r);
341 r->halves[HALF_LOCAL].rconn = local;
342 r->halves[HALF_REMOTE].rconn = remote;
343 for (i = 0; i < 2; i++) {
344 r->halves[i].rxbuf = NULL;
346 r->is_mgmt_conn = is_mgmt_conn;
351 relay_run(struct relay *r, const struct hook hooks[], size_t n_hooks)
356 for (i = 0; i < 2; i++) {
357 rconn_run(r->halves[i].rconn);
360 /* Limit the number of iterations to prevent other tasks from starving. */
361 for (iteration = 0; iteration < 50; iteration++) {
362 bool progress = false;
363 for (i = 0; i < 2; i++) {
364 struct half *this = &r->halves[i];
365 struct half *peer = &r->halves[!i];
368 this->rxbuf = rconn_recv(this->rconn);
370 const struct hook *h;
371 for (h = hooks; h < &hooks[n_hooks]; h++) {
372 if (h->packet_cb(r, i, h->aux)) {
373 buffer_delete(this->rxbuf);
383 int retval = rconn_send(peer->rconn, this->rxbuf);
384 if (retval != EAGAIN) {
388 buffer_delete(this->rxbuf);
399 if (r->is_mgmt_conn) {
400 for (i = 0; i < 2; i++) {
401 struct half *this = &r->halves[i];
402 if (!rconn_is_alive(this->rconn)) {
411 relay_wait(struct relay *r)
415 for (i = 0; i < 2; i++) {
416 struct half *this = &r->halves[i];
418 rconn_run_wait(this->rconn);
420 rconn_recv_wait(this->rconn);
426 relay_destroy(struct relay *r)
430 list_remove(&r->node);
431 for (i = 0; i < 2; i++) {
432 struct half *this = &r->halves[i];
433 rconn_destroy(this->rconn);
434 buffer_delete(this->rxbuf);
439 /* In-band control. */
441 struct in_band_data {
442 const struct settings *s;
443 struct mac_learning *ml;
444 struct netdev *of_device;
445 uint8_t mac[ETH_ADDR_LEN];
449 queue_tx(struct rconn *rc, struct buffer *b)
451 if (rconn_force_send(rc, b)) {
456 static const uint8_t *
457 get_controller_mac(struct netdev *netdev, struct rconn *controller)
459 static uint32_t ip, last_nonzero_ip;
460 static uint8_t mac[ETH_ADDR_LEN], last_nonzero_mac[ETH_ADDR_LEN];
461 static time_t next_refresh = 0;
463 uint32_t last_ip = ip;
465 time_t now = time(0);
467 ip = rconn_get_ip(controller);
468 if (last_ip != ip || !next_refresh || now >= next_refresh) {
471 /* Look up MAC address. */
472 memset(mac, 0, sizeof mac);
474 int retval = netdev_arp_lookup(netdev, ip, mac);
476 VLOG_DBG("cannot look up controller hw address ("IP_FMT"): %s",
477 IP_ARGS(&ip), strerror(retval));
480 have_mac = !eth_addr_is_zero(mac);
482 /* Log changes in IP, MAC addresses. */
483 if (ip && ip != last_nonzero_ip) {
484 VLOG_DBG("controller IP address changed from "IP_FMT
485 " to "IP_FMT, IP_ARGS(&last_nonzero_ip), IP_ARGS(&ip));
486 last_nonzero_ip = ip;
488 if (have_mac && memcmp(last_nonzero_mac, mac, ETH_ADDR_LEN)) {
489 VLOG_DBG("controller MAC address changed from "ETH_ADDR_FMT" to "
491 ETH_ADDR_ARGS(last_nonzero_mac), ETH_ADDR_ARGS(mac));
492 memcpy(last_nonzero_mac, mac, ETH_ADDR_LEN);
495 /* Schedule next refresh.
497 * If we have an IP address but not a MAC address, then refresh
498 * quickly, since we probably will get a MAC address soon (via ARP).
499 * Otherwise, we can afford to wait a little while. */
500 next_refresh = now + (!ip || have_mac ? 10 : 1);
502 return !eth_addr_is_zero(mac) ? mac : NULL;
506 is_controller_mac(const uint8_t mac[ETH_ADDR_LEN],
507 const uint8_t *controller_mac)
509 return controller_mac && eth_addr_equals(mac, controller_mac);
513 in_band_packet_cb(struct relay *r, int half, void *in_band_)
515 struct in_band_data *in_band = in_band_;
516 struct rconn *rc = r->halves[HALF_LOCAL].rconn;
517 struct buffer *msg = r->halves[HALF_LOCAL].rxbuf;
518 struct ofp_packet_in *opi;
519 struct ofp_header *oh;
520 size_t pkt_ofs, pkt_len;
523 uint16_t in_port, out_port;
524 const uint8_t *controller_mac;
526 if (half != HALF_LOCAL || r->is_mgmt_conn) {
531 if (oh->type != OFPT_PACKET_IN) {
534 if (msg->size < offsetof (struct ofp_packet_in, data)) {
535 VLOG_WARN("packet too short (%zu bytes) for packet_in", msg->size);
539 /* Extract flow data from 'opi' into 'flow'. */
541 in_port = ntohs(opi->in_port);
542 pkt_ofs = offsetof(struct ofp_packet_in, data);
543 pkt_len = ntohs(opi->header.length) - pkt_ofs;
544 pkt.data = opi->data;
546 flow_extract(&pkt, in_port, &flow);
548 /* Deal with local stuff. */
549 controller_mac = get_controller_mac(in_band->of_device,
550 r->halves[HALF_REMOTE].rconn);
551 if (in_port == OFPP_LOCAL) {
552 /* Sent by secure channel. */
553 out_port = mac_learning_lookup(in_band->ml, flow.dl_dst);
554 } else if (eth_addr_equals(flow.dl_dst, in_band->mac)) {
555 /* Sent to secure channel. */
556 out_port = OFPP_LOCAL;
557 if (mac_learning_learn(in_band->ml, flow.dl_src, in_port)) {
558 VLOG_DBG("learned that "ETH_ADDR_FMT" is on port %"PRIu16,
559 ETH_ADDR_ARGS(flow.dl_src), in_port);
561 } else if (flow.dl_type == htons(ETH_TYPE_ARP)
562 && eth_addr_is_broadcast(flow.dl_dst)
563 && is_controller_mac(flow.dl_src, controller_mac)) {
564 /* ARP sent by controller. */
565 out_port = OFPP_FLOOD;
566 } else if (is_controller_mac(flow.dl_dst, controller_mac)
567 && in_port == mac_learning_lookup(in_band->ml,
569 /* Drop controller traffic that arrives on the controller port. */
570 queue_tx(rc, make_add_flow(&flow, ntohl(opi->buffer_id),
571 in_band->s->max_idle, 0));
577 if (out_port != OFPP_FLOOD) {
578 /* The output port is known, so add a new flow. */
579 queue_tx(rc, make_add_simple_flow(&flow, ntohl(opi->buffer_id),
580 out_port, in_band->s->max_idle));
582 /* If the switch didn't buffer the packet, we need to send a copy. */
583 if (ntohl(opi->buffer_id) == UINT32_MAX) {
584 queue_tx(rc, make_unbuffered_packet_out(&pkt, in_port, out_port));
587 /* We don't know that MAC. Send along the packet without setting up a
590 if (ntohl(opi->buffer_id) == UINT32_MAX) {
591 b = make_unbuffered_packet_out(&pkt, in_port, out_port);
593 b = make_buffered_packet_out(ntohl(opi->buffer_id),
602 in_band_hook_create(const struct settings *s)
604 struct in_band_data *in_band;
607 in_band = xmalloc(sizeof *in_band);
609 in_band->ml = mac_learning_create();
610 retval = netdev_open(s->of_name, NETDEV_ETH_TYPE_NONE,
611 &in_band->of_device);
613 fatal(retval, "Could not open %s device", s->of_name);
615 memcpy(in_band->mac, netdev_get_etheraddr(in_band->of_device),
618 return make_hook(in_band_packet_cb, NULL, in_band);
621 /* Fail open support. */
623 struct fail_open_data {
624 const struct settings *s;
625 struct rconn *local_rconn;
626 struct rconn *remote_rconn;
627 struct lswitch *lswitch;
628 int last_disconn_secs;
631 /* Causes 'r' to enter or leave fail-open mode, if appropriate. */
633 fail_open_periodic_cb(void *fail_open_)
635 struct fail_open_data *fail_open = fail_open_;
639 disconn_secs = rconn_disconnected_duration(fail_open->remote_rconn);
640 open = disconn_secs >= fail_open->s->probe_interval * 3;
641 if (open != (fail_open->lswitch != NULL)) {
643 VLOG_WARN("No longer in fail-open mode");
644 lswitch_destroy(fail_open->lswitch);
645 fail_open->lswitch = NULL;
647 VLOG_WARN("Could not connect to controller for %d seconds, "
648 "failing open", disconn_secs);
649 fail_open->lswitch = lswitch_create(fail_open->local_rconn, true,
650 fail_open->s->max_idle);
651 fail_open->last_disconn_secs = disconn_secs;
653 } else if (open && disconn_secs > fail_open->last_disconn_secs + 60) {
654 VLOG_WARN("Still in fail-open mode after %d seconds disconnected "
655 "from controller", disconn_secs);
656 fail_open->last_disconn_secs = disconn_secs;
661 fail_open_packet_cb(struct relay *r, int half, void *fail_open_)
663 struct fail_open_data *fail_open = fail_open_;
664 if (half != HALF_LOCAL || r->is_mgmt_conn || !fail_open->lswitch) {
667 lswitch_process_packet(fail_open->lswitch, fail_open->local_rconn,
668 r->halves[HALF_LOCAL].rxbuf);
669 rconn_run(fail_open->local_rconn);
675 fail_open_hook_create(const struct settings *s, struct rconn *local_rconn,
676 struct rconn *remote_rconn)
678 struct fail_open_data *fail_open = xmalloc(sizeof *fail_open);
680 fail_open->local_rconn = local_rconn;
681 fail_open->remote_rconn = remote_rconn;
682 fail_open->lswitch = NULL;
683 return make_hook(fail_open_packet_cb, fail_open_periodic_cb, fail_open);
686 /* Controller discovery. */
690 const struct settings *s;
691 struct dhclient *dhcp;
692 bool ever_successful;
695 static struct discovery *
696 discovery_init(const struct settings *s)
698 struct netdev *netdev;
700 struct dhclient *dhcp;
703 /* Bring ofX network device up. */
704 retval = netdev_open(s->of_name, NETDEV_ETH_TYPE_NONE, &netdev);
706 fatal(retval, "Could not open %s device", s->of_name);
708 retval = netdev_turn_flags_on(netdev, NETDEV_UP, true);
710 fatal(retval, "Could not bring %s device up", s->of_name);
712 netdev_close(netdev);
714 /* Initialize DHCP client. */
715 retval = dhclient_create(s->of_name, modify_dhcp_request,
716 validate_dhcp_offer, (void *) s, &dhcp);
718 fatal(retval, "Failed to initialize DHCP client");
720 dhclient_init(dhcp, 0);
722 d = xmalloc(sizeof *d);
725 d->ever_successful = false;
730 discovery_question_connectivity(struct discovery *d)
732 dhclient_force_renew(d->dhcp, 15);
736 discovery_run(struct discovery *d, char **controller_name)
738 dhclient_run(d->dhcp);
739 if (!dhclient_changed(d->dhcp)) {
743 dhclient_configure_netdev(d->dhcp);
744 if (d->s->update_resolv_conf) {
745 dhclient_update_resolv_conf(d->dhcp);
748 if (dhclient_is_bound(d->dhcp)) {
749 *controller_name = dhcp_msg_get_string(dhclient_get_config(d->dhcp),
750 DHCP_CODE_OFP_CONTROLLER_VCONN);
751 VLOG_WARN("%s: discovered controller", *controller_name);
752 d->ever_successful = true;
753 } else if (controller_name) {
754 *controller_name = NULL;
755 if (d->ever_successful) {
756 VLOG_WARN("discovered controller no longer available");
763 discovery_wait(struct discovery *d)
765 dhclient_wait(d->dhcp);
769 modify_dhcp_request(struct dhcp_msg *msg, void *aux)
771 dhcp_msg_put_string(msg, DHCP_CODE_VENDOR_CLASS, "OpenFlow");
775 validate_dhcp_offer(const struct dhcp_msg *msg, void *s_)
777 const struct settings *s = s_;
781 vconn_name = dhcp_msg_get_string(msg, DHCP_CODE_OFP_CONTROLLER_VCONN);
783 VLOG_WARN("rejecting DHCP offer missing controller vconn");
786 accept = !regexec(&s->accept_controller_regex, vconn_name, 0, NULL, 0);
788 VLOG_WARN("rejecting controller vconn that fails to match %s",
789 s->accept_controller_re);
795 /* User interface. */
798 parse_options(int argc, char *argv[], struct settings *s)
801 OPT_ACCEPT_VCONN = UCHAR_MAX + 1,
803 OPT_INACTIVITY_PROBE,
807 static struct option long_options[] = {
808 {"accept-vconn", required_argument, 0, OPT_ACCEPT_VCONN},
809 {"no-resolv-conf", no_argument, 0, OPT_NO_RESOLV_CONF},
810 {"fail", required_argument, 0, 'f'},
811 {"inactivity-probe", required_argument, 0, OPT_INACTIVITY_PROBE},
812 {"max-idle", required_argument, 0, OPT_MAX_IDLE},
813 {"max-backoff", required_argument, 0, OPT_MAX_BACKOFF},
814 {"listen", required_argument, 0, 'l'},
815 {"detach", no_argument, 0, 'D'},
816 {"pidfile", optional_argument, 0, 'P'},
817 {"verbose", optional_argument, 0, 'v'},
818 {"help", no_argument, 0, 'h'},
819 {"version", no_argument, 0, 'V'},
820 VCONN_SSL_LONG_OPTIONS
823 char *short_options = long_options_to_short_options(long_options);
824 char *accept_re = NULL;
827 /* Set defaults that we can figure out before parsing options. */
828 s->listen_vconn_name = NULL;
829 s->fail_mode = FAIL_OPEN;
831 s->probe_interval = 15;
833 s->update_resolv_conf = true;
837 c = getopt_long(argc, argv, short_options, long_options, NULL);
843 case OPT_ACCEPT_VCONN:
844 accept_re = optarg[0] == '^' ? optarg : xasprintf("^%s", optarg);
847 case OPT_NO_RESOLV_CONF:
848 s->update_resolv_conf = false;
852 if (!strcmp(optarg, "open")) {
853 s->fail_mode = FAIL_OPEN;
854 } else if (!strcmp(optarg, "closed")) {
855 s->fail_mode = FAIL_CLOSED;
858 "-f or --fail argument must be \"open\" or \"closed\"");
862 case OPT_INACTIVITY_PROBE:
863 s->probe_interval = atoi(optarg);
864 if (s->probe_interval < 5) {
865 fatal(0, "--inactivity-probe argument must be at least 5");
870 if (!strcmp(optarg, "permanent")) {
871 s->max_idle = OFP_FLOW_PERMANENT;
873 s->max_idle = atoi(optarg);
874 if (s->max_idle < 1 || s->max_idle > 65535) {
875 fatal(0, "--max-idle argument must be between 1 and "
876 "65535 or the word 'permanent'");
881 case OPT_MAX_BACKOFF:
882 s->max_backoff = atoi(optarg);
883 if (s->max_backoff < 1) {
884 fatal(0, "--max-backoff argument must be at least 1");
885 } else if (s->max_backoff > 3600) {
886 s->max_backoff = 3600;
899 if (s->listen_vconn_name) {
900 fatal(0, "-l or --listen may be only specified once");
902 s->listen_vconn_name = optarg;
909 printf("%s "VERSION" compiled "__DATE__" "__TIME__"\n", argv[0]);
913 vlog_set_verbosity(optarg);
916 VCONN_SSL_OPTION_HANDLERS
929 if (argc < 1 || argc > 2) {
930 fatal(0, "need one or two non-option arguments; use --help for usage");
933 /* Local and remote vconns. */
934 s->nl_name = argv[0];
935 if (strncmp(s->nl_name, "nl:", 3)
936 || strlen(s->nl_name) < 4
937 || s->nl_name[strspn(s->nl_name + 3, "0123456789") + 3]) {
938 fatal(0, "%s: argument is not of the form \"nl:DP_IDX\"", s->nl_name);
940 s->of_name = xasprintf("of%s", s->nl_name + 3);
941 s->controller_name = argc > 1 ? xstrdup(argv[1]) : NULL;
943 /* Set accept_controller_regex. */
945 accept_re = vconn_ssl_is_configured() ? "^ssl:.*" : ".*";
947 retval = regcomp(&s->accept_controller_regex, accept_re,
948 REG_NOSUB | REG_EXTENDED);
950 size_t length = regerror(retval, &s->accept_controller_regex, NULL, 0);
951 char *buffer = xmalloc(length);
952 regerror(retval, &s->accept_controller_regex, buffer, length);
953 fatal(0, "%s: %s", accept_re, buffer);
955 s->accept_controller_re = accept_re;
957 /* Mode of operation. */
958 s->discovery = s->controller_name == NULL;
962 enum netdev_flags flags;
963 struct netdev *netdev;
965 retval = netdev_open(s->of_name, NETDEV_ETH_TYPE_NONE, &netdev);
967 fatal(retval, "Could not open %s device", s->of_name);
970 retval = netdev_get_flags(netdev, &flags);
972 fatal(retval, "Could not get flags for %s device", s->of_name);
975 s->in_band = (flags & NETDEV_UP) != 0;
976 if (s->in_band && netdev_get_in6(netdev, NULL)) {
977 VLOG_WARN("Ignoring IPv6 address on %s device: IPv6 not supported",
981 netdev_close(netdev);
988 printf("%s: secure channel, a relay for OpenFlow messages.\n"
989 "usage: %s [OPTIONS] nl:DP_IDX [CONTROLLER]\n"
990 "where nl:DP_IDX is a datapath that has been added with dpctl.\n"
991 "CONTROLLER is an active OpenFlow connection method; if it is\n"
992 "omitted, then secchan performs controller discovery.\n",
993 program_name, program_name);
994 vconn_usage(true, true);
995 printf("\nController discovery options:\n"
996 " --accept-vconn=REGEX accept matching discovered controllers\n"
997 " --no-resolv-conf do not update /etc/resolv.conf\n"
998 "\nNetworking options:\n"
999 " -f, --fail=open|closed when controller connection fails:\n"
1000 " closed: drop all packets\n"
1001 " open (default): act as learning switch\n"
1002 " --inactivity-probe=SECS time between inactivity probes\n"
1003 " --max-idle=SECS max idle for flows set up by secchan\n"
1004 " --max-backoff=SECS max time between controller connection\n"
1005 " attempts (default: 15 seconds)\n"
1006 " -l, --listen=METHOD allow management connections on METHOD\n"
1007 " (a passive OpenFlow connection method)\n"
1008 "\nOther options:\n"
1009 " -D, --detach run in background as daemon\n"
1010 " -P, --pidfile[=FILE] create pidfile (default: %s/secchan.pid)\n"
1011 " -v, --verbose=MODULE[:FACILITY[:LEVEL]] set logging levels\n"
1012 " -v, --verbose set maximum verbosity level\n"
1013 " -h, --help display this help message\n"
1014 " -V, --version display version information\n",