utilities/ovs-controller.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010 Nicira Networks.
   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 <string.h>
  25
  26 #include "command-line.h"
  27 #include "compiler.h"
  28 #include "daemon.h"
  29 #include "learning-switch.h"
  30 #include "ofpbuf.h"
  31 #include "openflow/openflow.h"
  32 #include "poll-loop.h"
  33 #include "rconn.h"
  34 #include "stream-ssl.h"
  35 #include "timeval.h"
  36 #include "unixctl.h"
  37 #include "util.h"
  38 #include "vconn.h"
  39
  40 #include "vlog.h"
  41 #define THIS_MODULE VLM_controller
  42
  43 #define MAX_SWITCHES 16
  44 #define MAX_LISTENERS 16
  45
  46 struct switch_ {
  47     struct lswitch *lswitch;
  48     struct rconn *rconn;
  49 };
  50
  51 /* Learn the ports on which MAC addresses appear? */
  52 static bool learn_macs = true;
  53
  54 /* Set up flows?  (If not, every packet is processed at the controller.) */
  55 static bool set_up_flows = true;
  56
  57 /* -N, --normal: Use "NORMAL" action instead of explicit port? */
  58 static bool action_normal = false;
  59
  60 /* -w, --wildcard: Set up exact match or wildcard flow entries? */
  61 static bool exact_flows = true;
  62
  63 /* --max-idle: Maximum idle time, in seconds, before flows expire. */
  64 static int max_idle = 60;
  65
  66 /* --mute: If true, accept connections from switches but do not reply to any
  67  * of their messages (for debugging fail-open mode). */
  68 static bool mute = false;
  69
  70 static int do_switching(struct switch_ *);
  71 static void new_switch(struct switch_ *, struct vconn *, const char *name);
  72 static void parse_options(int argc, char *argv[]);
  73 static void usage(void) NO_RETURN;
  74
  75 int
  76 main(int argc, char *argv[])
  77 {
  78     struct unixctl_server *unixctl;
  79     struct switch_ switches[MAX_SWITCHES];
  80     struct pvconn *listeners[MAX_LISTENERS];
  81     int n_switches, n_listeners;
  82     int retval;
  83     int i;
  84
  85     proctitle_init(argc, argv);
  86     set_program_name(argv[0]);
  87     time_init();
  88     vlog_init();
  89     parse_options(argc, argv);
  90     signal(SIGPIPE, SIG_IGN);
  91
  92     if (argc - optind < 1) {
  93         ovs_fatal(0, "at least one vconn argument required; "
  94                   "use --help for usage");
  95     }
  96
  97     n_switches = n_listeners = 0;
  98     for (i = optind; i < argc; i++) {
  99         const char *name = argv[i];
 100         struct vconn *vconn;
 101         int retval;
 102
 103         retval = vconn_open(name, OFP_VERSION, &vconn);
 104         if (!retval) {
 105             if (n_switches >= MAX_SWITCHES) {
 106                 ovs_fatal(0, "max %d switch connections", n_switches);
 107             }
 108             new_switch(&switches[n_switches++], vconn, name);
 109             continue;
 110         } else if (retval == EAFNOSUPPORT) {
 111             struct pvconn *pvconn;
 112             retval = pvconn_open(name, &pvconn);
 113             if (!retval) {
 114                 if (n_listeners >= MAX_LISTENERS) {
 115                     ovs_fatal(0, "max %d passive connections", n_listeners);
 116                 }
 117                 listeners[n_listeners++] = pvconn;
 118             }
 119         }
 120         if (retval) {
 121             VLOG_ERR("%s: connect: %s", name, strerror(retval));
 122         }
 123     }
 124     if (n_switches == 0 && n_listeners == 0) {
 125         ovs_fatal(0, "no active or passive switch connections");
 126     }
 127
 128     die_if_already_running();
 129     daemonize_start();
 130
 131     retval = unixctl_server_create(NULL, &unixctl);
 132     if (retval) {
 133         exit(EXIT_FAILURE);
 134     }
 135
 136     daemonize_complete();
 137
 138     while (n_switches > 0 || n_listeners > 0) {
 139         int iteration;
 140         int i;
 141
 142         /* Accept connections on listening vconns. */
 143         for (i = 0; i < n_listeners && n_switches < MAX_SWITCHES; ) {
 144             struct vconn *new_vconn;
 145             int retval;
 146
 147             retval = pvconn_accept(listeners[i], OFP_VERSION, &new_vconn);
 148             if (!retval || retval == EAGAIN) {
 149                 if (!retval) {
 150                     new_switch(&switches[n_switches++], new_vconn, "tcp");
 151                 }
 152                 i++;
 153             } else {
 154                 pvconn_close(listeners[i]);
 155                 listeners[i] = listeners[--n_listeners];
 156             }
 157         }
 158
 159         /* Do some switching work.  Limit the number of iterations so that
 160          * callbacks registered with the poll loop don't starve. */
 161         for (iteration = 0; iteration < 50; iteration++) {
 162             bool progress = false;
 163             for (i = 0; i < n_switches; ) {
 164                 struct switch_ *this = &switches[i];
 165                 int retval = do_switching(this);
 166                 if (!retval || retval == EAGAIN) {
 167                     if (!retval) {
 168                         progress = true;
 169                     }
 170                     i++;
 171                 } else {
 172                     rconn_destroy(this->rconn);
 173                     lswitch_destroy(this->lswitch);
 174                     switches[i] = switches[--n_switches];
 175                 }
 176             }
 177             if (!progress) {
 178                 break;
 179             }
 180         }
 181         for (i = 0; i < n_switches; i++) {
 182             struct switch_ *this = &switches[i];
 183             lswitch_run(this->lswitch, this->rconn);
 184         }
 185
 186         unixctl_server_run(unixctl);
 187
 188         /* Wait for something to happen. */
 189         if (n_switches < MAX_SWITCHES) {
 190             for (i = 0; i < n_listeners; i++) {
 191                 pvconn_wait(listeners[i]);
 192             }
 193         }
 194         for (i = 0; i < n_switches; i++) {
 195             struct switch_ *sw = &switches[i];
 196             rconn_run_wait(sw->rconn);
 197             rconn_recv_wait(sw->rconn);
 198             lswitch_wait(sw->lswitch);
 199         }
 200         unixctl_server_wait(unixctl);
 201         poll_block();
 202     }
 203
 204     return 0;
 205 }
 206
 207 static void
 208 new_switch(struct switch_ *sw, struct vconn *vconn, const char *name)
 209 {
 210     sw->rconn = rconn_new_from_vconn(name, vconn);
 211     sw->lswitch = lswitch_create(sw->rconn, learn_macs, exact_flows,
 212                                  set_up_flows ? max_idle : -1,
 213                                  action_normal);
 214 }
 215
 216 static int
 217 do_switching(struct switch_ *sw)
 218 {
 219     unsigned int packets_sent;
 220     struct ofpbuf *msg;
 221
 222     packets_sent = rconn_packets_sent(sw->rconn);
 223
 224     msg = rconn_recv(sw->rconn);
 225     if (msg) {
 226         if (!mute) {
 227             lswitch_process_packet(sw->lswitch, sw->rconn, msg);
 228         }
 229         ofpbuf_delete(msg);
 230     }
 231     rconn_run(sw->rconn);
 232
 233     return (!rconn_is_alive(sw->rconn) ? EOF
 234             : rconn_packets_sent(sw->rconn) != packets_sent ? 0
 235             : EAGAIN);
 236 }
 237
 238 static void
 239 parse_options(int argc, char *argv[])
 240 {
 241     enum {
 242         OPT_MAX_IDLE = UCHAR_MAX + 1,
 243         OPT_PEER_CA_CERT,
 244         OPT_MUTE,
 245         VLOG_OPTION_ENUMS
 246     };
 247     static struct option long_options[] = {
 248         {"hub",         no_argument, 0, 'H'},
 249         {"noflow",      no_argument, 0, 'n'},
 250         {"normal",      no_argument, 0, 'N'},
 251         {"wildcard",    no_argument, 0, 'w'},
 252         {"max-idle",    required_argument, 0, OPT_MAX_IDLE},
 253         {"mute",        no_argument, 0, OPT_MUTE},
 254         {"help",        no_argument, 0, 'h'},
 255         {"version",     no_argument, 0, 'V'},
 256         DAEMON_LONG_OPTIONS,
 257         VLOG_LONG_OPTIONS,
 258 #ifdef HAVE_OPENSSL
 259         STREAM_SSL_LONG_OPTIONS
 260         {"peer-ca-cert", required_argument, 0, OPT_PEER_CA_CERT},
 261 #endif
 262         {0, 0, 0, 0},
 263     };
 264     char *short_options = long_options_to_short_options(long_options);
 265
 266     for (;;) {
 267         int indexptr;
 268         int c;
 269
 270         c = getopt_long(argc, argv, short_options, long_options, &indexptr);
 271         if (c == -1) {
 272             break;
 273         }
 274
 275         switch (c) {
 276         case 'H':
 277             learn_macs = false;
 278             break;
 279
 280         case 'n':
 281             set_up_flows = false;
 282             break;
 283
 284         case OPT_MUTE:
 285             mute = true;
 286             break;
 287
 288         case 'N':
 289             action_normal = true;
 290             break;
 291
 292         case 'w':
 293             exact_flows = false;
 294             break;
 295
 296         case OPT_MAX_IDLE:
 297             if (!strcmp(optarg, "permanent")) {
 298                 max_idle = OFP_FLOW_PERMANENT;
 299             } else {
 300                 max_idle = atoi(optarg);
 301                 if (max_idle < 1 || max_idle > 65535) {
 302                     ovs_fatal(0, "--max-idle argument must be between 1 and "
 303                               "65535 or the word 'permanent'");
 304                 }
 305             }
 306             break;
 307
 308         case 'h':
 309             usage();
 310
 311         case 'V':
 312             OVS_PRINT_VERSION(OFP_VERSION, OFP_VERSION);
 313             exit(EXIT_SUCCESS);
 314
 315         VLOG_OPTION_HANDLERS
 316         DAEMON_OPTION_HANDLERS
 317
 318 #ifdef HAVE_OPENSSL
 319         STREAM_SSL_OPTION_HANDLERS
 320
 321         case OPT_PEER_CA_CERT:
 322             stream_ssl_set_peer_ca_cert_file(optarg);
 323             break;
 324 #endif
 325
 326         case '?':
 327             exit(EXIT_FAILURE);
 328
 329         default:
 330             abort();
 331         }
 332     }
 333     free(short_options);
 334 }
 335
 336 static void
 337 usage(void)
 338 {
 339     printf("%s: OpenFlow controller\n"
 340            "usage: %s [OPTIONS] METHOD\n"
 341            "where METHOD is any OpenFlow connection method.\n",
 342            program_name, program_name);
 343     vconn_usage(true, true, false);
 344     daemon_usage();
 345     vlog_usage();
 346     printf("\nOther options:\n"
 347            "  -H, --hub               act as hub instead of learning switch\n"
 348            "  -n, --noflow            pass traffic, but don't add flows\n"
 349            "  --max-idle=SECS         max idle time for new flows\n"
 350            "  -N, --normal            use OFPAT_NORMAL action\n"
 351            "  -w, --wildcard          use wildcards, not exact-match rules\n"
 352            "  -h, --help              display this help message\n"
 353            "  -V, --version           display version information\n");
 354     exit(EXIT_SUCCESS);
 355 }