utilities/ovs-controller.c

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