lib/learning-switch.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 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 #include "learning-switch.h"
  19
  20 #include <errno.h>
  21 #include <inttypes.h>
  22 #include <netinet/in.h>
  23 #include <stdlib.h>
  24 #include <time.h>
  25
  26 #include "byte-order.h"
  27 #include "classifier.h"
  28 #include "flow.h"
  29 #include "hmap.h"
  30 #include "mac-learning.h"
  31 #include "ofpbuf.h"
  32 #include "ofp-actions.h"
  33 #include "ofp-errors.h"
  34 #include "ofp-msgs.h"
  35 #include "ofp-parse.h"
  36 #include "ofp-print.h"
  37 #include "ofp-util.h"
  38 #include "openflow/openflow.h"
  39 #include "poll-loop.h"
  40 #include "rconn.h"
  41 #include "shash.h"
  42 #include "simap.h"
  43 #include "timeval.h"
  44 #include "openvswitch/vconn.h"
  45 #include "openvswitch/vlog.h"
  46
  47 VLOG_DEFINE_THIS_MODULE(learning_switch);
  48
  49 struct lswitch_port {
  50     struct hmap_node hmap_node; /* Hash node for port number. */
  51     ofp_port_t port_no;         /* OpenFlow port number. */
  52     uint32_t queue_id;          /* OpenFlow queue number. */
  53 };
  54
  55 enum lswitch_state {
  56     S_CONNECTING,               /* Waiting for connection to complete. */
  57     S_FEATURES_REPLY,           /* Waiting for features reply. */
  58     S_SWITCHING,                /* Switching flows. */
  59 };
  60
  61 struct lswitch {
  62     struct rconn *rconn;
  63     enum lswitch_state state;
  64
  65     /* If nonnegative, the switch sets up flows that expire after the given
  66      * number of seconds (or never expire, if the value is OFP_FLOW_PERMANENT).
  67      * Otherwise, the switch processes every packet. */
  68     int max_idle;
  69
  70     enum ofputil_protocol protocol;
  71     unsigned long long int datapath_id;
  72     struct mac_learning *ml;    /* NULL to act as hub instead of switch. */
  73     struct flow_wildcards wc;   /* Wildcards to apply to flows. */
  74     bool action_normal;         /* Use OFPP_NORMAL? */
  75
  76     /* Queue distribution. */
  77     uint32_t default_queue;     /* Default OpenFlow queue, or UINT32_MAX. */
  78     struct hmap queue_numbers;  /* Map from port number to lswitch_port. */
  79     struct shash queue_names;   /* Map from port name to lswitch_port. */
  80
  81     /* Number of outgoing queued packets on the rconn. */
  82     struct rconn_packet_counter *queued;
  83
  84     /* If true, do not reply to any messages from the switch (for debugging
  85      * fail-open mode). */
  86     bool mute;
  87
  88     /* Optional "flow mod" requests to send to the switch at connection time,
  89      * to set up the flow table. */
  90     const struct ofputil_flow_mod *default_flows;
  91     size_t n_default_flows;
  92     enum ofputil_protocol usable_protocols;
  93 };
  94
  95 /* The log messages here could actually be useful in debugging, so keep the
  96  * rate limit relatively high. */
  97 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(30, 300);
  98
  99 static void queue_tx(struct lswitch *, struct ofpbuf *);
 100 static void send_features_request(struct lswitch *);
 101
 102 static void lswitch_process_packet(struct lswitch *, const struct ofpbuf *);
 103 static enum ofperr process_switch_features(struct lswitch *,
 104                                            struct ofp_header *);
 105 static void process_packet_in(struct lswitch *, const struct ofp_header *);
 106 static void process_echo_request(struct lswitch *, const struct ofp_header *);
 107
 108 static ofp_port_t get_mac_entry_ofp_port(const struct mac_learning *ml,
 109                                          const struct mac_entry *)
 110     OVS_REQ_RDLOCK(ml->rwlock);
 111 static void set_mac_entry_ofp_port(struct mac_learning *ml,
 112                                    struct mac_entry *, ofp_port_t)
 113     OVS_REQ_WRLOCK(ml->rwlock);
 114
 115 /* Creates and returns a new learning switch whose configuration is given by
 116  * 'cfg'.
 117  *
 118  * 'rconn' is used to send out an OpenFlow features request. */
 119 struct lswitch *
 120 lswitch_create(struct rconn *rconn, const struct lswitch_config *cfg)
 121 {
 122     struct lswitch *sw;
 123     uint32_t ofpfw;
 124
 125     sw = xzalloc(sizeof *sw);
 126     sw->rconn = rconn;
 127     sw->state = S_CONNECTING;
 128     sw->max_idle = cfg->max_idle;
 129     sw->datapath_id = 0;
 130     sw->ml = (cfg->mode == LSW_LEARN
 131               ? mac_learning_create(MAC_ENTRY_DEFAULT_IDLE_TIME)
 132               : NULL);
 133     sw->action_normal = cfg->mode == LSW_NORMAL;
 134
 135     switch (cfg->wildcards) {
 136     case 0:
 137         ofpfw = 0;
 138         break;
 139
 140     case UINT32_MAX:
 141         /* Try to wildcard as many fields as possible, but we cannot
 142          * wildcard all fields.  We need in_port to detect moves.  We need
 143          * Ethernet source and dest and VLAN VID to do L2 learning. */
 144         ofpfw = (OFPFW10_DL_TYPE | OFPFW10_DL_VLAN_PCP
 145                  | OFPFW10_NW_SRC_ALL | OFPFW10_NW_DST_ALL
 146                  | OFPFW10_NW_TOS | OFPFW10_NW_PROTO
 147                  | OFPFW10_TP_SRC | OFPFW10_TP_DST);
 148         break;
 149
 150     default:
 151         ofpfw = cfg->wildcards;
 152         break;
 153     }
 154     ofputil_wildcard_from_ofpfw10(ofpfw, &sw->wc);
 155
 156     sw->default_queue = cfg->default_queue;
 157     hmap_init(&sw->queue_numbers);
 158     shash_init(&sw->queue_names);
 159     if (cfg->port_queues) {
 160         struct simap_node *node;
 161
 162         SIMAP_FOR_EACH (node, cfg->port_queues) {
 163             struct lswitch_port *port = xmalloc(sizeof *port);
 164             hmap_node_nullify(&port->hmap_node);
 165             port->queue_id = node->data;
 166             shash_add(&sw->queue_names, node->name, port);
 167         }
 168     }
 169
 170     sw->default_flows = cfg->default_flows;
 171     sw->n_default_flows = cfg->n_default_flows;
 172     sw->usable_protocols = cfg->usable_protocols;
 173
 174     sw->queued = rconn_packet_counter_create();
 175
 176     return sw;
 177 }
 178
 179 static void
 180 lswitch_handshake(struct lswitch *sw)
 181 {
 182     enum ofputil_protocol protocol;
 183     enum ofp_version version;
 184
 185     send_features_request(sw);
 186
 187     version = rconn_get_version(sw->rconn);
 188     protocol = ofputil_protocol_from_ofp_version(version);
 189     if (version >= OFP13_VERSION) {
 190         /* OpenFlow 1.3 and later by default drop packets that miss in the flow
 191          * table.  Set up a flow to send packets to the controller by
 192          * default. */
 193         struct ofputil_flow_mod fm;
 194         struct ofpact_output output;
 195         struct ofpbuf *msg;
 196         int error;
 197
 198         ofpact_init_OUTPUT(&output);
 199         output.port = OFPP_CONTROLLER;
 200         output.max_len = OFP_DEFAULT_MISS_SEND_LEN;
 201
 202         match_init_catchall(&fm.match);
 203         fm.priority = 0;
 204         fm.cookie = 0;
 205         fm.cookie_mask = 0;
 206         fm.new_cookie = 0;
 207         fm.modify_cookie = false;
 208         fm.table_id = 0;
 209         fm.command = OFPFC_ADD;
 210         fm.idle_timeout = 0;
 211         fm.hard_timeout = 0;
 212         fm.importance = 0;
 213         fm.buffer_id = UINT32_MAX;
 214         fm.out_port = OFPP_NONE;
 215         fm.out_group = OFPG_ANY;
 216         fm.flags = 0;
 217         fm.ofpacts = &output.ofpact;
 218         fm.ofpacts_len = sizeof output;
 219         fm.delete_reason = 0;
 220
 221         msg = ofputil_encode_flow_mod(&fm, protocol);
 222         error = rconn_send(sw->rconn, msg, NULL);
 223         if (error) {
 224             VLOG_INFO_RL(&rl, "%s: failed to add default flow (%s)",
 225                          rconn_get_name(sw->rconn), ovs_strerror(error));
 226         }
 227     }
 228     if (sw->default_flows) {
 229         struct ofpbuf *msg = NULL;
 230         int error = 0;
 231         size_t i;
 232
 233         /* If the initial protocol isn't good enough for default_flows, then
 234          * pick one that will work and encode messages to set up that
 235          * protocol.
 236          *
 237          * This could be improved by actually negotiating a mutually acceptable
 238          * flow format with the switch, but that would require an asynchronous
 239          * state machine.  This version ought to work fine in practice. */
 240         if (!(protocol & sw->usable_protocols)) {
 241             enum ofputil_protocol want = rightmost_1bit(sw->usable_protocols);
 242             while (!error) {
 243                 msg = ofputil_encode_set_protocol(protocol, want, &protocol);
 244                 if (!msg) {
 245                     break;
 246                 }
 247                 error = rconn_send(sw->rconn, msg, NULL);
 248             }
 249         }
 250         if (protocol & sw->usable_protocols) {
 251             for (i = 0; !error && i < sw->n_default_flows; i++) {
 252                 msg = ofputil_encode_flow_mod(&sw->default_flows[i], protocol);
 253                 error = rconn_send(sw->rconn, msg, NULL);
 254             }
 255
 256             if (error) {
 257                 VLOG_INFO_RL(&rl, "%s: failed to queue default flows (%s)",
 258                              rconn_get_name(sw->rconn), ovs_strerror(error));
 259             }
 260         } else {
 261             VLOG_INFO_RL(&rl, "%s: failed to set usable protocol",
 262                          rconn_get_name(sw->rconn));
 263         }
 264     }
 265     sw->protocol = protocol;
 266 }
 267
 268 bool
 269 lswitch_is_alive(const struct lswitch *sw)
 270 {
 271     return rconn_is_alive(sw->rconn);
 272 }
 273
 274 /* Destroys 'sw'. */
 275 void
 276 lswitch_destroy(struct lswitch *sw)
 277 {
 278     if (sw) {
 279         struct lswitch_port *node, *next;
 280
 281         rconn_destroy(sw->rconn);
 282         HMAP_FOR_EACH_SAFE (node, next, hmap_node, &sw->queue_numbers) {
 283             hmap_remove(&sw->queue_numbers, &node->hmap_node);
 284             free(node);
 285         }
 286         shash_destroy(&sw->queue_names);
 287         mac_learning_unref(sw->ml);
 288         rconn_packet_counter_destroy(sw->queued);
 289         free(sw);
 290     }
 291 }
 292
 293 /* Takes care of necessary 'sw' activity, except for receiving packets (which
 294  * the caller must do). */
 295 void
 296 lswitch_run(struct lswitch *sw)
 297 {
 298     int i;
 299
 300     if (sw->ml) {
 301         ovs_rwlock_wrlock(&sw->ml->rwlock);
 302         mac_learning_run(sw->ml);
 303         ovs_rwlock_unlock(&sw->ml->rwlock);
 304     }
 305
 306     rconn_run(sw->rconn);
 307
 308     if (sw->state == S_CONNECTING) {
 309         if (rconn_get_version(sw->rconn) != -1) {
 310             lswitch_handshake(sw);
 311             sw->state = S_FEATURES_REPLY;
 312         }
 313         return;
 314     }
 315
 316     for (i = 0; i < 50; i++) {
 317         struct ofpbuf *msg;
 318
 319         msg = rconn_recv(sw->rconn);
 320         if (!msg) {
 321             break;
 322         }
 323
 324         if (!sw->mute) {
 325             lswitch_process_packet(sw, msg);
 326         }
 327         ofpbuf_delete(msg);
 328     }
 329 }
 330
 331 void
 332 lswitch_wait(struct lswitch *sw)
 333 {
 334     if (sw->ml) {
 335         ovs_rwlock_rdlock(&sw->ml->rwlock);
 336         mac_learning_wait(sw->ml);
 337         ovs_rwlock_unlock(&sw->ml->rwlock);
 338     }
 339     rconn_run_wait(sw->rconn);
 340     rconn_recv_wait(sw->rconn);
 341 }
 342
 343 /* Processes 'msg', which should be an OpenFlow received on 'rconn', according
 344  * to the learning switch state in 'sw'.  The most likely result of processing
 345  * is that flow-setup and packet-out OpenFlow messages will be sent out on
 346  * 'rconn'.  */
 347 static void
 348 lswitch_process_packet(struct lswitch *sw, const struct ofpbuf *msg)
 349 {
 350     enum ofptype type;
 351     struct ofpbuf b;
 352
 353     b = *msg;
 354     if (ofptype_pull(&type, &b)) {
 355         return;
 356     }
 357
 358     if (sw->state == S_FEATURES_REPLY
 359         && type != OFPTYPE_ECHO_REQUEST
 360         && type != OFPTYPE_FEATURES_REPLY) {
 361         return;
 362     }
 363
 364     switch (type) {
 365     case OFPTYPE_ECHO_REQUEST:
 366         process_echo_request(sw, ofpbuf_data(msg));
 367         break;
 368
 369     case OFPTYPE_FEATURES_REPLY:
 370         if (sw->state == S_FEATURES_REPLY) {
 371             if (!process_switch_features(sw, ofpbuf_data(msg))) {
 372                 sw->state = S_SWITCHING;
 373             } else {
 374                 rconn_disconnect(sw->rconn);
 375             }
 376         }
 377         break;
 378
 379     case OFPTYPE_PACKET_IN:
 380         process_packet_in(sw, ofpbuf_data(msg));
 381         break;
 382
 383     case OFPTYPE_FLOW_REMOVED:
 384         /* Nothing to do. */
 385         break;
 386
 387     case OFPTYPE_HELLO:
 388     case OFPTYPE_ERROR:
 389     case OFPTYPE_ECHO_REPLY:
 390     case OFPTYPE_FEATURES_REQUEST:
 391     case OFPTYPE_GET_CONFIG_REQUEST:
 392     case OFPTYPE_GET_CONFIG_REPLY:
 393     case OFPTYPE_SET_CONFIG:
 394     case OFPTYPE_PORT_STATUS:
 395     case OFPTYPE_PACKET_OUT:
 396     case OFPTYPE_FLOW_MOD:
 397     case OFPTYPE_GROUP_MOD:
 398     case OFPTYPE_PORT_MOD:
 399     case OFPTYPE_TABLE_MOD:
 400     case OFPTYPE_BARRIER_REQUEST:
 401     case OFPTYPE_BARRIER_REPLY:
 402     case OFPTYPE_QUEUE_GET_CONFIG_REQUEST:
 403     case OFPTYPE_QUEUE_GET_CONFIG_REPLY:
 404     case OFPTYPE_DESC_STATS_REQUEST:
 405     case OFPTYPE_DESC_STATS_REPLY:
 406     case OFPTYPE_FLOW_STATS_REQUEST:
 407     case OFPTYPE_FLOW_STATS_REPLY:
 408     case OFPTYPE_AGGREGATE_STATS_REQUEST:
 409     case OFPTYPE_AGGREGATE_STATS_REPLY:
 410     case OFPTYPE_TABLE_STATS_REQUEST:
 411     case OFPTYPE_TABLE_STATS_REPLY:
 412     case OFPTYPE_PORT_STATS_REQUEST:
 413     case OFPTYPE_PORT_STATS_REPLY:
 414     case OFPTYPE_QUEUE_STATS_REQUEST:
 415     case OFPTYPE_QUEUE_STATS_REPLY:
 416     case OFPTYPE_PORT_DESC_STATS_REQUEST:
 417     case OFPTYPE_PORT_DESC_STATS_REPLY:
 418     case OFPTYPE_ROLE_REQUEST:
 419     case OFPTYPE_ROLE_REPLY:
 420     case OFPTYPE_ROLE_STATUS:
 421     case OFPTYPE_SET_FLOW_FORMAT:
 422     case OFPTYPE_FLOW_MOD_TABLE_ID:
 423     case OFPTYPE_SET_PACKET_IN_FORMAT:
 424     case OFPTYPE_FLOW_AGE:
 425     case OFPTYPE_SET_CONTROLLER_ID:
 426     case OFPTYPE_FLOW_MONITOR_STATS_REQUEST:
 427     case OFPTYPE_FLOW_MONITOR_STATS_REPLY:
 428     case OFPTYPE_FLOW_MONITOR_CANCEL:
 429     case OFPTYPE_FLOW_MONITOR_PAUSED:
 430     case OFPTYPE_FLOW_MONITOR_RESUMED:
 431     case OFPTYPE_GET_ASYNC_REQUEST:
 432     case OFPTYPE_GET_ASYNC_REPLY:
 433     case OFPTYPE_SET_ASYNC_CONFIG:
 434     case OFPTYPE_METER_MOD:
 435     case OFPTYPE_GROUP_STATS_REQUEST:
 436     case OFPTYPE_GROUP_STATS_REPLY:
 437     case OFPTYPE_GROUP_DESC_STATS_REQUEST:
 438     case OFPTYPE_GROUP_DESC_STATS_REPLY:
 439     case OFPTYPE_GROUP_FEATURES_STATS_REQUEST:
 440     case OFPTYPE_GROUP_FEATURES_STATS_REPLY:
 441     case OFPTYPE_METER_STATS_REQUEST:
 442     case OFPTYPE_METER_STATS_REPLY:
 443     case OFPTYPE_METER_CONFIG_STATS_REQUEST:
 444     case OFPTYPE_METER_CONFIG_STATS_REPLY:
 445     case OFPTYPE_METER_FEATURES_STATS_REQUEST:
 446     case OFPTYPE_METER_FEATURES_STATS_REPLY:
 447     case OFPTYPE_TABLE_FEATURES_STATS_REQUEST:
 448     case OFPTYPE_TABLE_FEATURES_STATS_REPLY:
 449     case OFPTYPE_BUNDLE_CONTROL:
 450     case OFPTYPE_BUNDLE_ADD_MESSAGE:
 451     default:
 452         if (VLOG_IS_DBG_ENABLED()) {
 453             char *s = ofp_to_string(ofpbuf_data(msg), ofpbuf_size(msg), 2);
 454             VLOG_DBG_RL(&rl, "%016llx: OpenFlow packet ignored: %s",
 455                         sw->datapath_id, s);
 456             free(s);
 457         }
 458     }
 459 }
 460 \f
 461 static void
 462 send_features_request(struct lswitch *sw)
 463 {
 464     struct ofpbuf *b;
 465     struct ofp_switch_config *osc;
 466     int ofp_version = rconn_get_version(sw->rconn);
 467
 468     ovs_assert(ofp_version > 0 && ofp_version < 0xff);
 469
 470     /* Send OFPT_FEATURES_REQUEST. */
 471     b = ofpraw_alloc(OFPRAW_OFPT_FEATURES_REQUEST, ofp_version, 0);
 472     queue_tx(sw, b);
 473
 474     /* Send OFPT_SET_CONFIG. */
 475     b = ofpraw_alloc(OFPRAW_OFPT_SET_CONFIG, ofp_version, sizeof *osc);
 476     osc = ofpbuf_put_zeros(b, sizeof *osc);
 477     osc->miss_send_len = htons(OFP_DEFAULT_MISS_SEND_LEN);
 478     queue_tx(sw, b);
 479 }
 480
 481 static void
 482 queue_tx(struct lswitch *sw, struct ofpbuf *b)
 483 {
 484     int retval = rconn_send_with_limit(sw->rconn, b, sw->queued, 10);
 485     if (retval && retval != ENOTCONN) {
 486         if (retval == EAGAIN) {
 487             VLOG_INFO_RL(&rl, "%016llx: %s: tx queue overflow",
 488                          sw->datapath_id, rconn_get_name(sw->rconn));
 489         } else {
 490             VLOG_WARN_RL(&rl, "%016llx: %s: send: %s",
 491                          sw->datapath_id, rconn_get_name(sw->rconn),
 492                          ovs_strerror(retval));
 493         }
 494     }
 495 }
 496
 497 static enum ofperr
 498 process_switch_features(struct lswitch *sw, struct ofp_header *oh)
 499 {
 500     struct ofputil_switch_features features;
 501     struct ofputil_phy_port port;
 502     enum ofperr error;
 503     struct ofpbuf b;
 504
 505     error = ofputil_decode_switch_features(oh, &features, &b);
 506     if (error) {
 507         VLOG_ERR("received invalid switch feature reply (%s)",
 508                  ofperr_to_string(error));
 509         return error;
 510     }
 511
 512     sw->datapath_id = features.datapath_id;
 513
 514     while (!ofputil_pull_phy_port(oh->version, &b, &port)) {
 515         struct lswitch_port *lp = shash_find_data(&sw->queue_names, port.name);
 516         if (lp && hmap_node_is_null(&lp->hmap_node)) {
 517             lp->port_no = port.port_no;
 518             hmap_insert(&sw->queue_numbers, &lp->hmap_node,
 519                         hash_ofp_port(lp->port_no));
 520         }
 521     }
 522     return 0;
 523 }
 524
 525 static ofp_port_t
 526 lswitch_choose_destination(struct lswitch *sw, const struct flow *flow)
 527 {
 528     ofp_port_t out_port;
 529
 530     /* Learn the source MAC. */
 531     if (sw->ml) {
 532         ovs_rwlock_wrlock(&sw->ml->rwlock);
 533         if (mac_learning_may_learn(sw->ml, flow->dl_src, 0)) {
 534             struct mac_entry *mac = mac_learning_insert(sw->ml, flow->dl_src,
 535                                                         0);
 536             if (get_mac_entry_ofp_port(sw->ml, mac)
 537                 != flow->in_port.ofp_port) {
 538                 VLOG_DBG_RL(&rl, "%016llx: learned that "ETH_ADDR_FMT" is on "
 539                             "port %"PRIu16, sw->datapath_id,
 540                             ETH_ADDR_ARGS(flow->dl_src),
 541                             flow->in_port.ofp_port);
 542
 543                 set_mac_entry_ofp_port(sw->ml, mac, flow->in_port.ofp_port);
 544             }
 545         }
 546         ovs_rwlock_unlock(&sw->ml->rwlock);
 547     }
 548
 549     /* Drop frames for reserved multicast addresses. */
 550     if (eth_addr_is_reserved(flow->dl_dst)) {
 551         return OFPP_NONE;
 552     }
 553
 554     out_port = OFPP_FLOOD;
 555     if (sw->ml) {
 556         struct mac_entry *mac;
 557
 558         ovs_rwlock_rdlock(&sw->ml->rwlock);
 559         mac = mac_learning_lookup(sw->ml, flow->dl_dst, 0);
 560         if (mac) {
 561             out_port = get_mac_entry_ofp_port(sw->ml, mac);
 562             if (out_port == flow->in_port.ofp_port) {
 563                 /* Don't send a packet back out its input port. */
 564                 ovs_rwlock_unlock(&sw->ml->rwlock);
 565                 return OFPP_NONE;
 566             }
 567         }
 568         ovs_rwlock_unlock(&sw->ml->rwlock);
 569     }
 570
 571     /* Check if we need to use "NORMAL" action. */
 572     if (sw->action_normal && out_port != OFPP_FLOOD) {
 573         return OFPP_NORMAL;
 574     }
 575
 576     return out_port;
 577 }
 578
 579 static uint32_t
 580 get_queue_id(const struct lswitch *sw, ofp_port_t in_port)
 581 {
 582     const struct lswitch_port *port;
 583
 584     HMAP_FOR_EACH_WITH_HASH (port, hmap_node, hash_ofp_port(in_port),
 585                              &sw->queue_numbers) {
 586         if (port->port_no == in_port) {
 587             return port->queue_id;
 588         }
 589     }
 590
 591     return sw->default_queue;
 592 }
 593
 594 static void
 595 process_packet_in(struct lswitch *sw, const struct ofp_header *oh)
 596 {
 597     struct ofputil_packet_in pi;
 598     uint32_t queue_id;
 599     ofp_port_t out_port;
 600
 601     uint64_t ofpacts_stub[64 / 8];
 602     struct ofpbuf ofpacts;
 603
 604     struct ofputil_packet_out po;
 605     enum ofperr error;
 606
 607     struct ofpbuf pkt;
 608     struct flow flow;
 609
 610     error = ofputil_decode_packet_in(&pi, oh);
 611     if (error) {
 612         VLOG_WARN_RL(&rl, "failed to decode packet-in: %s",
 613                      ofperr_to_string(error));
 614         return;
 615     }
 616
 617     /* Ignore packets sent via output to OFPP_CONTROLLER.  This library never
 618      * uses such an action.  You never know what experiments might be going on,
 619      * though, and it seems best not to interfere with them. */
 620     if (pi.reason != OFPR_NO_MATCH) {
 621         return;
 622     }
 623
 624     /* Extract flow data from 'opi' into 'flow'. */
 625     ofpbuf_use_const(&pkt, pi.packet, pi.packet_len);
 626     flow_extract(&pkt, NULL, &flow);
 627     flow.in_port.ofp_port = pi.fmd.in_port;
 628     flow.tunnel.tun_id = pi.fmd.tun_id;
 629
 630     /* Choose output port. */
 631     out_port = lswitch_choose_destination(sw, &flow);
 632
 633     /* Make actions. */
 634     queue_id = get_queue_id(sw, pi.fmd.in_port);
 635     ofpbuf_use_stack(&ofpacts, ofpacts_stub, sizeof ofpacts_stub);
 636     if (out_port == OFPP_NONE) {
 637         /* No actions. */
 638     } else if (queue_id == UINT32_MAX
 639                || ofp_to_u16(out_port) >= ofp_to_u16(OFPP_MAX)) {
 640         ofpact_put_OUTPUT(&ofpacts)->port = out_port;
 641     } else {
 642         struct ofpact_enqueue *enqueue = ofpact_put_ENQUEUE(&ofpacts);
 643         enqueue->port = out_port;
 644         enqueue->queue = queue_id;
 645     }
 646     ofpact_pad(&ofpacts);
 647
 648     /* Prepare packet_out in case we need one. */
 649     po.buffer_id = pi.buffer_id;
 650     if (po.buffer_id == UINT32_MAX) {
 651         po.packet = ofpbuf_data(&pkt);
 652         po.packet_len = ofpbuf_size(&pkt);
 653     } else {
 654         po.packet = NULL;
 655         po.packet_len = 0;
 656     }
 657     po.in_port = pi.fmd.in_port;
 658     po.ofpacts = ofpbuf_data(&ofpacts);
 659     po.ofpacts_len = ofpbuf_size(&ofpacts);
 660
 661     /* Send the packet, and possibly the whole flow, to the output port. */
 662     if (sw->max_idle >= 0 && (!sw->ml || out_port != OFPP_FLOOD)) {
 663         struct ofputil_flow_mod fm;
 664         struct ofpbuf *buffer;
 665
 666         /* The output port is known, or we always flood everything, so add a
 667          * new flow. */
 668         memset(&fm, 0, sizeof fm);
 669         match_init(&fm.match, &flow, &sw->wc);
 670         ofputil_normalize_match_quiet(&fm.match);
 671         fm.priority = 1; /* Must be > 0 because of table-miss flow entry. */
 672         fm.table_id = 0xff;
 673         fm.command = OFPFC_ADD;
 674         fm.idle_timeout = sw->max_idle;
 675         fm.buffer_id = pi.buffer_id;
 676         fm.out_port = OFPP_NONE;
 677         fm.ofpacts = ofpbuf_data(&ofpacts);
 678         fm.ofpacts_len = ofpbuf_size(&ofpacts);
 679         buffer = ofputil_encode_flow_mod(&fm, sw->protocol);
 680
 681         queue_tx(sw, buffer);
 682
 683         /* If the switch didn't buffer the packet, we need to send a copy. */
 684         if (pi.buffer_id == UINT32_MAX && out_port != OFPP_NONE) {
 685             queue_tx(sw, ofputil_encode_packet_out(&po, sw->protocol));
 686         }
 687     } else {
 688         /* We don't know that MAC, or we don't set up flows.  Send along the
 689          * packet without setting up a flow. */
 690         if (pi.buffer_id != UINT32_MAX || out_port != OFPP_NONE) {
 691             queue_tx(sw, ofputil_encode_packet_out(&po, sw->protocol));
 692         }
 693     }
 694 }
 695
 696 static void
 697 process_echo_request(struct lswitch *sw, const struct ofp_header *rq)
 698 {
 699     queue_tx(sw, make_echo_reply(rq));
 700 }
 701
 702 static ofp_port_t
 703 get_mac_entry_ofp_port(const struct mac_learning *ml,
 704                        const struct mac_entry *e)
 705     OVS_REQ_RDLOCK(ml->rwlock)
 706 {
 707     void *port = mac_entry_get_port(ml, e);
 708     return (OVS_FORCE ofp_port_t) (uintptr_t) port;
 709 }
 710
 711 static void
 712 set_mac_entry_ofp_port(struct mac_learning *ml,
 713                        struct mac_entry *e, ofp_port_t ofp_port)
 714     OVS_REQ_WRLOCK(ml->rwlock)
 715 {
 716     mac_entry_set_port(ml, e, (void *) (OVS_FORCE uintptr_t) ofp_port);
 717 }