utilities/ovs-controller.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
   3  *
   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:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17 #include <config.h>
  18
  19 #include <errno.h>
  20 #include <getopt.h>
  21 #include <limits.h>
  22 #include <signal.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26
  27 #include "command-line.h"
  28 #include "compiler.h"
  29 #include "daemon.h"
  30 #include "learning-switch.h"
  31 #include "ofp-parse.h"
  32 #include "ofp-version-opt.h"
  33 #include "ofpbuf.h"
  34 #include "openflow/openflow.h"
  35 #include "poll-loop.h"
  36 #include "rconn.h"
  37 #include "simap.h"
  38 #include "stream-ssl.h"
  39 #include "timeval.h"
  40 #include "unixctl.h"
  41 #include "util.h"
  42 #include "vconn.h"
  43 #include "vlog.h"
  44 #include "socket-util.h"
  45 #include "ofp-util.h"
  46
  47 VLOG_DEFINE_THIS_MODULE(controller);
  48
  49 #define MAX_SWITCHES 16
  50 #define MAX_LISTENERS 16
  51
  52 struct switch_ {
  53     struct lswitch *lswitch;
  54 };
  55
  56 /* -H, --hub: Learn the ports on which MAC addresses appear? */
  57 static bool learn_macs = true;
  58
  59 /* -n, --noflow: Set up flows?  (If not, every packet is processed at the
  60  * controller.) */
  61 static bool set_up_flows = true;
  62
  63 /* -N, --normal: Use "NORMAL" action instead of explicit port? */
  64 static bool action_normal = false;
  65
  66 /* -w, --wildcard: 0 to disable wildcard flow entries, an OFPFW10_* bitmask to
  67  * enable specific wildcards, or UINT32_MAX to use the default wildcards. */
  68 static uint32_t wildcards = 0;
  69
  70 /* --max-idle: Maximum idle time, in seconds, before flows expire. */
  71 static int max_idle = 60;
  72
  73 /* --mute: If true, accept connections from switches but do not reply to any
  74  * of their messages (for debugging fail-open mode). */
  75 static bool mute = false;
  76
  77 /* -q, --queue: default OpenFlow queue, none if UINT32_MAX. */
  78 static uint32_t default_queue = UINT32_MAX;
  79
  80 /* -Q, --port-queue: map from port name to port number. */
  81 static struct simap port_queues = SIMAP_INITIALIZER(&port_queues);
  82
  83 /* --with-flows: Flows to send to switch. */
  84 static struct ofputil_flow_mod *default_flows;
  85 static size_t n_default_flows;
  86
  87 /* --unixctl: Name of unixctl socket, or null to use the default. */
  88 static char *unixctl_path = NULL;
  89
  90 static void new_switch(struct switch_ *, struct vconn *);
  91 static void parse_options(int argc, char *argv[]);
  92 static void usage(void) NO_RETURN;
  93
  94 int
  95 main(int argc, char *argv[])
  96 {
  97     struct unixctl_server *unixctl;
  98     struct switch_ switches[MAX_SWITCHES];
  99     struct pvconn *listeners[MAX_LISTENERS];
 100     int n_switches, n_listeners;
 101     int retval;
 102     int i;
 103
 104     proctitle_init(argc, argv);
 105     set_program_name(argv[0]);
 106     parse_options(argc, argv);
 107     signal(SIGPIPE, SIG_IGN);
 108
 109     if (argc - optind < 1) {
 110         ovs_fatal(0, "at least one vconn argument required; "
 111                   "use --help for usage");
 112     }
 113
 114     n_switches = n_listeners = 0;
 115     for (i = optind; i < argc; i++) {
 116         const char *name = argv[i];
 117         struct vconn *vconn;
 118
 119         retval = vconn_open(name, get_allowed_ofp_versions(), DSCP_DEFAULT,
 120                             &vconn);
 121         if (!retval) {
 122             if (n_switches >= MAX_SWITCHES) {
 123                 ovs_fatal(0, "max %d switch connections", n_switches);
 124             }
 125             new_switch(&switches[n_switches++], vconn);
 126             continue;
 127         } else if (retval == EAFNOSUPPORT) {
 128             struct pvconn *pvconn;
 129             retval = pvconn_open(name, get_allowed_ofp_versions(),
 130                                  DSCP_DEFAULT, &pvconn);
 131             if (!retval) {
 132                 if (n_listeners >= MAX_LISTENERS) {
 133                     ovs_fatal(0, "max %d passive connections", n_listeners);
 134                 }
 135                 listeners[n_listeners++] = pvconn;
 136             }
 137         }
 138         if (retval) {
 139             VLOG_ERR("%s: connect: %s", name, strerror(retval));
 140         }
 141     }
 142     if (n_switches == 0 && n_listeners == 0) {
 143         ovs_fatal(0, "no active or passive switch connections");
 144     }
 145
 146     daemonize_start();
 147
 148     retval = unixctl_server_create(unixctl_path, &unixctl);
 149     if (retval) {
 150         exit(EXIT_FAILURE);
 151     }
 152
 153     daemonize_complete();
 154
 155     while (n_switches > 0 || n_listeners > 0) {
 156         /* Accept connections on listening vconns. */
 157         for (i = 0; i < n_listeners && n_switches < MAX_SWITCHES; ) {
 158             struct vconn *new_vconn;
 159
 160             retval = pvconn_accept(listeners[i], &new_vconn);
 161             if (!retval || retval == EAGAIN) {
 162                 if (!retval) {
 163                     new_switch(&switches[n_switches++], new_vconn);
 164                 }
 165                 i++;
 166             } else {
 167                 pvconn_close(listeners[i]);
 168                 listeners[i] = listeners[--n_listeners];
 169             }
 170         }
 171
 172         /* Do some switching work.  . */
 173         for (i = 0; i < n_switches; ) {
 174             struct switch_ *this = &switches[i];
 175             lswitch_run(this->lswitch);
 176             if (lswitch_is_alive(this->lswitch)) {
 177                 i++;
 178             } else {
 179                 lswitch_destroy(this->lswitch);
 180                 switches[i] = switches[--n_switches];
 181             }
 182         }
 183
 184         unixctl_server_run(unixctl);
 185
 186         /* Wait for something to happen. */
 187         if (n_switches < MAX_SWITCHES) {
 188             for (i = 0; i < n_listeners; i++) {
 189                 pvconn_wait(listeners[i]);
 190             }
 191         }
 192         for (i = 0; i < n_switches; i++) {
 193             struct switch_ *sw = &switches[i];
 194             lswitch_wait(sw->lswitch);
 195         }
 196         unixctl_server_wait(unixctl);
 197         poll_block();
 198     }
 199
 200     return 0;
 201 }
 202
 203 static void
 204 new_switch(struct switch_ *sw, struct vconn *vconn)
 205 {
 206     struct lswitch_config cfg;
 207     struct rconn *rconn;
 208
 209     rconn = rconn_create(60, 0, DSCP_DEFAULT, get_allowed_ofp_versions());
 210     rconn_connect_unreliably(rconn, vconn, NULL);
 211
 212     cfg.mode = (action_normal ? LSW_NORMAL
 213                 : learn_macs ? LSW_LEARN
 214                 : LSW_FLOOD);
 215     cfg.wildcards = wildcards;
 216     cfg.max_idle = set_up_flows ? max_idle : -1;
 217     cfg.default_flows = default_flows;
 218     cfg.n_default_flows = n_default_flows;
 219     cfg.default_queue = default_queue;
 220     cfg.port_queues = &port_queues;
 221     cfg.mute = mute;
 222     sw->lswitch = lswitch_create(rconn, &cfg);
 223 }
 224
 225 static void
 226 add_port_queue(char *s)
 227 {
 228     char *save_ptr = NULL;
 229     char *port_name;
 230     char *queue_id;
 231
 232     port_name = strtok_r(s, ":", &save_ptr);
 233     queue_id = strtok_r(NULL, "", &save_ptr);
 234     if (!queue_id) {
 235         ovs_fatal(0, "argument to -Q or --port-queue should take the form "
 236                   "\"<port-name>:<queue-id>\"");
 237     }
 238
 239     if (!simap_put(&port_queues, port_name, atoi(queue_id))) {
 240         ovs_fatal(0, "<port-name> arguments for -Q or --port-queue must "
 241                   "be unique");
 242     }
 243 }
 244
 245 static void
 246 parse_options(int argc, char *argv[])
 247 {
 248     enum {
 249         OPT_MAX_IDLE = UCHAR_MAX + 1,
 250         OPT_PEER_CA_CERT,
 251         OPT_MUTE,
 252         OPT_WITH_FLOWS,
 253         OPT_UNIXCTL,
 254         VLOG_OPTION_ENUMS,
 255         DAEMON_OPTION_ENUMS,
 256         OFP_VERSION_OPTION_ENUMS
 257     };
 258     static struct option long_options[] = {
 259         {"hub",         no_argument, NULL, 'H'},
 260         {"noflow",      no_argument, NULL, 'n'},
 261         {"normal",      no_argument, NULL, 'N'},
 262         {"wildcards",   optional_argument, NULL, 'w'},
 263         {"max-idle",    required_argument, NULL, OPT_MAX_IDLE},
 264         {"mute",        no_argument, NULL, OPT_MUTE},
 265         {"queue",       required_argument, NULL, 'q'},
 266         {"port-queue",  required_argument, NULL, 'Q'},
 267         {"with-flows",  required_argument, NULL, OPT_WITH_FLOWS},
 268         {"unixctl",     required_argument, NULL, OPT_UNIXCTL},
 269         {"help",        no_argument, NULL, 'h'},
 270         DAEMON_LONG_OPTIONS,
 271         OFP_VERSION_LONG_OPTIONS,
 272         VLOG_LONG_OPTIONS,
 273         STREAM_SSL_LONG_OPTIONS,
 274         {"peer-ca-cert", required_argument, NULL, OPT_PEER_CA_CERT},
 275         {NULL, 0, NULL, 0},
 276     };
 277     char *short_options = long_options_to_short_options(long_options);
 278
 279     for (;;) {
 280         int indexptr;
 281         int c;
 282
 283         c = getopt_long(argc, argv, short_options, long_options, &indexptr);
 284         if (c == -1) {
 285             break;
 286         }
 287
 288         switch (c) {
 289         case 'H':
 290             learn_macs = false;
 291             break;
 292
 293         case 'n':
 294             set_up_flows = false;
 295             break;
 296
 297         case OPT_MUTE:
 298             mute = true;
 299             break;
 300
 301         case 'N':
 302             action_normal = true;
 303             break;
 304
 305         case 'w':
 306             wildcards = optarg ? strtol(optarg, NULL, 16) : UINT32_MAX;
 307             break;
 308
 309         case OPT_MAX_IDLE:
 310             if (!strcmp(optarg, "permanent")) {
 311                 max_idle = OFP_FLOW_PERMANENT;
 312             } else {
 313                 max_idle = atoi(optarg);
 314                 if (max_idle < 1 || max_idle > 65535) {
 315                     ovs_fatal(0, "--max-idle argument must be between 1 and "
 316                               "65535 or the word 'permanent'");
 317                 }
 318             }
 319             break;
 320
 321         case 'q':
 322             default_queue = atoi(optarg);
 323             break;
 324
 325         case 'Q':
 326             add_port_queue(optarg);
 327             break;
 328
 329         case OPT_WITH_FLOWS:
 330             parse_ofp_flow_mod_file(optarg, OFPFC_ADD, &default_flows,
 331                                     &n_default_flows);
 332             break;
 333
 334         case OPT_UNIXCTL:
 335             unixctl_path = optarg;
 336             break;
 337
 338         case 'h':
 339             usage();
 340
 341         VLOG_OPTION_HANDLERS
 342         OFP_VERSION_OPTION_HANDLERS
 343         DAEMON_OPTION_HANDLERS
 344
 345         STREAM_SSL_OPTION_HANDLERS
 346
 347         case OPT_PEER_CA_CERT:
 348             stream_ssl_set_peer_ca_cert_file(optarg);
 349             break;
 350
 351         case '?':
 352             exit(EXIT_FAILURE);
 353
 354         default:
 355             abort();
 356         }
 357     }
 358     free(short_options);
 359
 360     if (!simap_is_empty(&port_queues) || default_queue != UINT32_MAX) {
 361         if (action_normal) {
 362             ovs_error(0, "queue IDs are incompatible with -N or --normal; "
 363                       "not using OFPP_NORMAL");
 364             action_normal = false;
 365         }
 366
 367         if (!learn_macs) {
 368             ovs_error(0, "queue IDs are incompatible with -H or --hub; "
 369                       "not acting as hub");
 370             learn_macs = true;
 371         }
 372     }
 373 }
 374
 375 static void
 376 usage(void)
 377 {
 378     printf("%s: OpenFlow controller\n"
 379            "usage: %s [OPTIONS] METHOD\n"
 380            "where METHOD is any OpenFlow connection method.\n",
 381            program_name, program_name);
 382     vconn_usage(true, true, false);
 383     daemon_usage();
 384     ofp_version_usage();
 385     vlog_usage();
 386     printf("\nOther options:\n"
 387            "  -H, --hub               act as hub instead of learning switch\n"
 388            "  -n, --noflow            pass traffic, but don't add flows\n"
 389            "  --max-idle=SECS         max idle time for new flows\n"
 390            "  -N, --normal            use OFPP_NORMAL action\n"
 391            "  -w, --wildcards[=MASK]  wildcard (specified) bits in flows\n"
 392            "  -q, --queue=QUEUE-ID    OpenFlow queue ID to use for output\n"
 393            "  -Q PORT-NAME:QUEUE-ID   use QUEUE-ID for frames from PORT-NAME\n"
 394            "  --with-flows FILE       use the flows from FILE\n"
 395            "  --unixctl=SOCKET        override default control socket name\n"
 396            "  -h, --help              display this help message\n"
 397            "  -V, --version           display version information\n");
 398     exit(EXIT_SUCCESS);
 399 }