ofproto/ofproto-dpif-sflow.c

   1 /*
   2  * Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
   3  * Copyright (c) 2009 InMon Corp.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <config.h>
  19 #include "ofproto-dpif-sflow.h"
  20 #include <inttypes.h>
  21 #include <net/if.h>
  22 #include <stdlib.h>
  23 #include "collectors.h"
  24 #include "compiler.h"
  25 #include "dpif.h"
  26 #include "hash.h"
  27 #include "hmap.h"
  28 #include "netdev.h"
  29 #include "netlink.h"
  30 #include "ofpbuf.h"
  31 #include "ofproto.h"
  32 #include "packets.h"
  33 #include "poll-loop.h"
  34 #include "route-table.h"
  35 #include "sflow_api.h"
  36 #include "socket-util.h"
  37 #include "timeval.h"
  38 #include "vlog.h"
  39 #include "lib/odp-util.h"
  40 #include "ofproto-provider.h"
  41
  42 VLOG_DEFINE_THIS_MODULE(sflow);
  43
  44 struct dpif_sflow_port {
  45     struct hmap_node hmap_node; /* In struct dpif_sflow's "ports" hmap. */
  46     SFLDataSource_instance dsi; /* sFlow library's notion of port number. */
  47     struct ofport *ofport;      /* To retrive port stats. */
  48 };
  49
  50 struct dpif_sflow {
  51     struct collectors *collectors;
  52     SFLAgent *sflow_agent;
  53     struct ofproto_sflow_options *options;
  54     struct dpif *dpif;
  55     time_t next_tick;
  56     size_t n_flood, n_all;
  57     struct hmap ports;          /* Contains "struct dpif_sflow_port"s. */
  58     uint32_t probability;
  59 };
  60
  61 static void dpif_sflow_del_port__(struct dpif_sflow *,
  62                                   struct dpif_sflow_port *);
  63
  64 #define RECEIVER_INDEX 1
  65
  66 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
  67
  68 static bool
  69 nullable_string_is_equal(const char *a, const char *b)
  70 {
  71     return a ? b && !strcmp(a, b) : !b;
  72 }
  73
  74 static bool
  75 ofproto_sflow_options_equal(const struct ofproto_sflow_options *a,
  76                          const struct ofproto_sflow_options *b)
  77 {
  78     return (sset_equals(&a->targets, &b->targets)
  79             && a->sampling_rate == b->sampling_rate
  80             && a->polling_interval == b->polling_interval
  81             && a->header_len == b->header_len
  82             && a->sub_id == b->sub_id
  83             && nullable_string_is_equal(a->agent_device, b->agent_device)
  84             && nullable_string_is_equal(a->control_ip, b->control_ip));
  85 }
  86
  87 static struct ofproto_sflow_options *
  88 ofproto_sflow_options_clone(const struct ofproto_sflow_options *old)
  89 {
  90     struct ofproto_sflow_options *new = xmemdup(old, sizeof *old);
  91     sset_clone(&new->targets, &old->targets);
  92     new->agent_device = old->agent_device ? xstrdup(old->agent_device) : NULL;
  93     new->control_ip = old->control_ip ? xstrdup(old->control_ip) : NULL;
  94     return new;
  95 }
  96
  97 static void
  98 ofproto_sflow_options_destroy(struct ofproto_sflow_options *options)
  99 {
 100     if (options) {
 101         sset_destroy(&options->targets);
 102         free(options->agent_device);
 103         free(options->control_ip);
 104         free(options);
 105     }
 106 }
 107
 108 /* sFlow library callback to allocate memory. */
 109 static void *
 110 sflow_agent_alloc_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
 111                      size_t bytes)
 112 {
 113     return calloc(1, bytes);
 114 }
 115
 116 /* sFlow library callback to free memory. */
 117 static int
 118 sflow_agent_free_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
 119                     void *obj)
 120 {
 121     free(obj);
 122     return 0;
 123 }
 124
 125 /* sFlow library callback to report error. */
 126 static void
 127 sflow_agent_error_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
 128                      char *msg)
 129 {
 130     VLOG_WARN("sFlow agent error: %s", msg);
 131 }
 132
 133 /* sFlow library callback to send datagram. */
 134 static void
 135 sflow_agent_send_packet_cb(void *ds_, SFLAgent *agent OVS_UNUSED,
 136                            SFLReceiver *receiver OVS_UNUSED, u_char *pkt,
 137                            uint32_t pktLen)
 138 {
 139     struct dpif_sflow *ds = ds_;
 140     collectors_send(ds->collectors, pkt, pktLen);
 141 }
 142
 143 static struct dpif_sflow_port *
 144 dpif_sflow_find_port(const struct dpif_sflow *ds, uint16_t odp_port)
 145 {
 146     struct dpif_sflow_port *dsp;
 147
 148     HMAP_FOR_EACH_IN_BUCKET (dsp, hmap_node,
 149                              hash_int(odp_port, 0), &ds->ports) {
 150         if (ofp_port_to_odp_port(dsp->ofport->ofp_port) == odp_port) {
 151             return dsp;
 152         }
 153     }
 154     return NULL;
 155 }
 156
 157 static void
 158 sflow_agent_get_counters(void *ds_, SFLPoller *poller,
 159                          SFL_COUNTERS_SAMPLE_TYPE *cs)
 160 {
 161     struct dpif_sflow *ds = ds_;
 162     SFLCounters_sample_element elem;
 163     enum netdev_features current;
 164     struct dpif_sflow_port *dsp;
 165     SFLIf_counters *counters;
 166     struct netdev_stats stats;
 167     enum netdev_flags flags;
 168
 169     dsp = dpif_sflow_find_port(ds, poller->bridgePort);
 170     if (!dsp) {
 171         return;
 172     }
 173
 174     elem.tag = SFLCOUNTERS_GENERIC;
 175     counters = &elem.counterBlock.generic;
 176     counters->ifIndex = SFL_DS_INDEX(poller->dsi);
 177     counters->ifType = 6;
 178     if (!netdev_get_features(dsp->ofport->netdev, &current, NULL, NULL, NULL)) {
 179         /* The values of ifDirection come from MAU MIB (RFC 2668): 0 = unknown,
 180            1 = full-duplex, 2 = half-duplex, 3 = in, 4=out */
 181         counters->ifSpeed = netdev_features_to_bps(current);
 182         counters->ifDirection = (netdev_features_is_full_duplex(current)
 183                                  ? 1 : 2);
 184     } else {
 185         counters->ifSpeed = 100000000;
 186         counters->ifDirection = 0;
 187     }
 188     if (!netdev_get_flags(dsp->ofport->netdev, &flags) && flags & NETDEV_UP) {
 189         counters->ifStatus = 1; /* ifAdminStatus up. */
 190         if (netdev_get_carrier(dsp->ofport->netdev)) {
 191             counters->ifStatus |= 2; /* ifOperStatus us. */
 192         }
 193     } else {
 194         counters->ifStatus = 0;  /* Down. */
 195     }
 196
 197     /* XXX
 198        1. Is the multicast counter filled in?
 199        2. Does the multicast counter include broadcasts?
 200        3. Does the rx_packets counter include multicasts/broadcasts?
 201     */
 202     ofproto_port_get_stats(dsp->ofport, &stats);
 203     counters->ifInOctets = stats.rx_bytes;
 204     counters->ifInUcastPkts = stats.rx_packets;
 205     counters->ifInMulticastPkts = stats.multicast;
 206     counters->ifInBroadcastPkts = -1;
 207     counters->ifInDiscards = stats.rx_dropped;
 208     counters->ifInErrors = stats.rx_errors;
 209     counters->ifInUnknownProtos = -1;
 210     counters->ifOutOctets = stats.tx_bytes;
 211     counters->ifOutUcastPkts = stats.tx_packets;
 212     counters->ifOutMulticastPkts = -1;
 213     counters->ifOutBroadcastPkts = -1;
 214     counters->ifOutDiscards = stats.tx_dropped;
 215     counters->ifOutErrors = stats.tx_errors;
 216     counters->ifPromiscuousMode = 0;
 217
 218     SFLADD_ELEMENT(cs, &elem);
 219     sfl_poller_writeCountersSample(poller, cs);
 220 }
 221
 222 /* Obtains an address to use for the local sFlow agent and stores it into
 223  * '*agent_addr'.  Returns true if successful, false on failure.
 224  *
 225  * The sFlow agent address should be a local IP address that is persistent and
 226  * reachable over the network, if possible.  The IP address associated with
 227  * 'agent_device' is used if it has one, and otherwise 'control_ip', the IP
 228  * address used to talk to the controller.  If the agent device is not
 229  * specified then it is figured out by taking a look at the routing table based
 230  * on 'targets'. */
 231 static bool
 232 sflow_choose_agent_address(const char *agent_device,
 233                            const struct sset *targets,
 234                            const char *control_ip,
 235                            SFLAddress *agent_addr)
 236 {
 237     const char *target;
 238     struct in_addr in4;
 239
 240     memset(agent_addr, 0, sizeof *agent_addr);
 241     agent_addr->type = SFLADDRESSTYPE_IP_V4;
 242
 243     if (agent_device) {
 244         if (!netdev_get_in4_by_name(agent_device, &in4)) {
 245             goto success;
 246         }
 247     }
 248
 249     SSET_FOR_EACH (target, targets) {
 250         struct sockaddr_in sin;
 251         char name[IFNAMSIZ];
 252
 253         if (inet_parse_active(target, SFL_DEFAULT_COLLECTOR_PORT, &sin)
 254             && route_table_get_name(sin.sin_addr.s_addr, name)
 255             && !netdev_get_in4_by_name(name, &in4)) {
 256             goto success;
 257         }
 258     }
 259
 260     if (control_ip && !lookup_ip(control_ip, &in4)) {
 261         goto success;
 262     }
 263
 264     VLOG_ERR("could not determine IP address for sFlow agent");
 265     return false;
 266
 267 success:
 268     agent_addr->address.ip_v4.addr = (OVS_FORCE uint32_t) in4.s_addr;
 269     return true;
 270 }
 271
 272 void
 273 dpif_sflow_clear(struct dpif_sflow *ds)
 274 {
 275     if (ds->sflow_agent) {
 276         sfl_agent_release(ds->sflow_agent);
 277         ds->sflow_agent = NULL;
 278     }
 279     collectors_destroy(ds->collectors);
 280     ds->collectors = NULL;
 281     ofproto_sflow_options_destroy(ds->options);
 282     ds->options = NULL;
 283
 284     /* Turn off sampling to save CPU cycles. */
 285     ds->probability = 0;
 286 }
 287
 288 bool
 289 dpif_sflow_is_enabled(const struct dpif_sflow *ds)
 290 {
 291     return ds->collectors != NULL;
 292 }
 293
 294 struct dpif_sflow *
 295 dpif_sflow_create(struct dpif *dpif)
 296 {
 297     struct dpif_sflow *ds;
 298
 299     ds = xcalloc(1, sizeof *ds);
 300     ds->dpif = dpif;
 301     ds->next_tick = time_now() + 1;
 302     hmap_init(&ds->ports);
 303     ds->probability = 0;
 304     route_table_register();
 305
 306     return ds;
 307 }
 308
 309 /* 32-bit fraction of packets to sample with.  A value of 0 samples no packets,
 310  * a value of %UINT32_MAX samples all packets and intermediate values sample
 311  * intermediate fractions of packets. */
 312 uint32_t
 313 dpif_sflow_get_probability(const struct dpif_sflow *ds)
 314 {
 315     return ds->probability;
 316 }
 317
 318 void
 319 dpif_sflow_destroy(struct dpif_sflow *ds)
 320 {
 321     if (ds) {
 322         struct dpif_sflow_port *dsp, *next;
 323
 324         route_table_unregister();
 325         dpif_sflow_clear(ds);
 326         HMAP_FOR_EACH_SAFE (dsp, next, hmap_node, &ds->ports) {
 327             dpif_sflow_del_port__(ds, dsp);
 328         }
 329         hmap_destroy(&ds->ports);
 330         free(ds);
 331     }
 332 }
 333
 334 static void
 335 dpif_sflow_add_poller(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
 336 {
 337     SFLPoller *poller = sfl_agent_addPoller(ds->sflow_agent, &dsp->dsi, ds,
 338                                             sflow_agent_get_counters);
 339     sfl_poller_set_sFlowCpInterval(poller, ds->options->polling_interval);
 340     sfl_poller_set_sFlowCpReceiver(poller, RECEIVER_INDEX);
 341     sfl_poller_set_bridgePort(poller,
 342                               ofp_port_to_odp_port(dsp->ofport->ofp_port));
 343 }
 344
 345 static void
 346 dpif_sflow_add_sampler(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
 347 {
 348     SFLSampler *sampler = sfl_agent_addSampler(ds->sflow_agent, &dsp->dsi);
 349     sfl_sampler_set_sFlowFsPacketSamplingRate(sampler, ds->options->sampling_rate);
 350     sfl_sampler_set_sFlowFsMaximumHeaderSize(sampler, ds->options->header_len);
 351     sfl_sampler_set_sFlowFsReceiver(sampler, RECEIVER_INDEX);
 352 }
 353
 354 void
 355 dpif_sflow_add_port(struct dpif_sflow *ds, struct ofport *ofport)
 356 {
 357     struct dpif_sflow_port *dsp;
 358     uint16_t odp_port = ofp_port_to_odp_port(ofport->ofp_port);
 359     uint32_t ifindex;
 360
 361     dpif_sflow_del_port(ds, odp_port);
 362
 363     /* Add to table of ports. */
 364     dsp = xmalloc(sizeof *dsp);
 365     ifindex = netdev_get_ifindex(ofport->netdev);
 366     if (ifindex <= 0) {
 367         ifindex = (ds->sflow_agent->subId << 16) + odp_port;
 368     }
 369     dsp->ofport = ofport;
 370     SFL_DS_SET(dsp->dsi, 0, ifindex, 0);
 371     hmap_insert(&ds->ports, &dsp->hmap_node, hash_int(odp_port, 0));
 372
 373     /* Add poller and sampler. */
 374     if (ds->sflow_agent) {
 375         dpif_sflow_add_poller(ds, dsp);
 376         dpif_sflow_add_sampler(ds, dsp);
 377     }
 378 }
 379
 380 static void
 381 dpif_sflow_del_port__(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
 382 {
 383     if (ds->sflow_agent) {
 384         sfl_agent_removePoller(ds->sflow_agent, &dsp->dsi);
 385         sfl_agent_removeSampler(ds->sflow_agent, &dsp->dsi);
 386     }
 387     hmap_remove(&ds->ports, &dsp->hmap_node);
 388     free(dsp);
 389 }
 390
 391 void
 392 dpif_sflow_del_port(struct dpif_sflow *ds, uint16_t odp_port)
 393 {
 394     struct dpif_sflow_port *dsp = dpif_sflow_find_port(ds, odp_port);
 395     if (dsp) {
 396         dpif_sflow_del_port__(ds, dsp);
 397     }
 398 }
 399
 400 void
 401 dpif_sflow_set_options(struct dpif_sflow *ds,
 402                        const struct ofproto_sflow_options *options)
 403 {
 404     struct dpif_sflow_port *dsp;
 405     bool options_changed;
 406     SFLReceiver *receiver;
 407     SFLAddress agentIP;
 408     time_t now;
 409
 410     if (sset_is_empty(&options->targets) || !options->sampling_rate) {
 411         /* No point in doing any work if there are no targets or nothing to
 412          * sample. */
 413         dpif_sflow_clear(ds);
 414         return;
 415     }
 416
 417     options_changed = (!ds->options
 418                        || !ofproto_sflow_options_equal(options, ds->options));
 419
 420     /* Configure collectors if options have changed or if we're shortchanged in
 421      * collectors (which indicates that opening one or more of the configured
 422      * collectors failed, so that we should retry). */
 423     if (options_changed
 424         || collectors_count(ds->collectors) < sset_count(&options->targets)) {
 425         collectors_destroy(ds->collectors);
 426         collectors_create(&options->targets, SFL_DEFAULT_COLLECTOR_PORT,
 427                           &ds->collectors);
 428         if (ds->collectors == NULL) {
 429             VLOG_WARN_RL(&rl, "no collectors could be initialized, "
 430                          "sFlow disabled");
 431             dpif_sflow_clear(ds);
 432             return;
 433         }
 434     }
 435
 436     /* Choose agent IP address and agent device (if not yet setup) */
 437     if (!sflow_choose_agent_address(options->agent_device,
 438                                     &options->targets,
 439                                     options->control_ip, &agentIP)) {
 440         dpif_sflow_clear(ds);
 441         return;
 442     }
 443
 444     /* Avoid reconfiguring if options didn't change. */
 445     if (!options_changed) {
 446         return;
 447     }
 448     ofproto_sflow_options_destroy(ds->options);
 449     ds->options = ofproto_sflow_options_clone(options);
 450
 451     /* Create agent. */
 452     VLOG_INFO("creating sFlow agent %d", options->sub_id);
 453     if (ds->sflow_agent) {
 454         sfl_agent_release(ds->sflow_agent);
 455     }
 456     ds->sflow_agent = xcalloc(1, sizeof *ds->sflow_agent);
 457     now = time_wall();
 458     sfl_agent_init(ds->sflow_agent,
 459                    &agentIP,
 460                    options->sub_id,
 461                    now,         /* Boot time. */
 462                    now,         /* Current time. */
 463                    ds,          /* Pointer supplied to callbacks. */
 464                    sflow_agent_alloc_cb,
 465                    sflow_agent_free_cb,
 466                    sflow_agent_error_cb,
 467                    sflow_agent_send_packet_cb);
 468
 469     receiver = sfl_agent_addReceiver(ds->sflow_agent);
 470     sfl_receiver_set_sFlowRcvrOwner(receiver, "Open vSwitch sFlow");
 471     sfl_receiver_set_sFlowRcvrTimeout(receiver, 0xffffffff);
 472
 473     /* Set the sampling_rate down in the datapath. */
 474     ds->probability = MAX(1, UINT32_MAX / ds->options->sampling_rate);
 475
 476     /* Add samplers and pollers for the currently known ports. */
 477     HMAP_FOR_EACH (dsp, hmap_node, &ds->ports) {
 478         dpif_sflow_add_poller(ds, dsp);
 479         dpif_sflow_add_sampler(ds, dsp);
 480     }
 481 }
 482
 483 int
 484 dpif_sflow_odp_port_to_ifindex(const struct dpif_sflow *ds,
 485                                uint16_t odp_port)
 486 {
 487     struct dpif_sflow_port *dsp = dpif_sflow_find_port(ds, odp_port);
 488     return dsp ? SFL_DS_INDEX(dsp->dsi) : 0;
 489 }
 490
 491 void
 492 dpif_sflow_received(struct dpif_sflow *ds, struct ofpbuf *packet,
 493                     const struct flow *flow,
 494                     const union user_action_cookie *cookie)
 495 {
 496     SFL_FLOW_SAMPLE_TYPE fs;
 497     SFLFlow_sample_element hdrElem;
 498     SFLSampled_header *header;
 499     SFLFlow_sample_element switchElem;
 500     SFLSampler *sampler;
 501     struct dpif_sflow_port *in_dsp;
 502     struct netdev_stats stats;
 503     ovs_be16 vlan_tci;
 504     int error;
 505
 506     /* Build a flow sample */
 507     memset(&fs, 0, sizeof fs);
 508
 509     in_dsp = dpif_sflow_find_port(ds, ofp_port_to_odp_port(flow->in_port));
 510     if (!in_dsp) {
 511         return;
 512     }
 513     fs.input = SFL_DS_INDEX(in_dsp->dsi);
 514
 515     error = ofproto_port_get_stats(in_dsp->ofport, &stats);
 516     if (error) {
 517         VLOG_WARN_RL(&rl, "netdev get-stats error %s", strerror(error));
 518         return;
 519     }
 520     fs.sample_pool = stats.rx_packets;
 521
 522     /* We are going to give it to the sampler that represents this input port.
 523      * By implementing "ingress-only" sampling like this we ensure that we
 524      * never have to offer the same sample to more than one sampler. */
 525     sampler = sfl_agent_getSamplerByIfIndex(ds->sflow_agent, fs.input);
 526     if (!sampler) {
 527         VLOG_WARN_RL(&rl, "no sampler for input ifIndex (%"PRIu32")",
 528                      fs.input);
 529         return;
 530     }
 531
 532     /* Sampled header. */
 533     memset(&hdrElem, 0, sizeof hdrElem);
 534     hdrElem.tag = SFLFLOW_HEADER;
 535     header = &hdrElem.flowType.header;
 536     header->header_protocol = SFLHEADER_ETHERNET_ISO8023;
 537     /* The frame_length should include the Ethernet FCS (4 bytes),
 538        but it has already been stripped,  so we need to add 4 here. */
 539     header->frame_length = packet->size + 4;
 540     /* Ethernet FCS stripped off. */
 541     header->stripped = 4;
 542     header->header_length = MIN(packet->size,
 543                                 sampler->sFlowFsMaximumHeaderSize);
 544     header->header_bytes = packet->data;
 545
 546     /* Add extended switch element. */
 547     memset(&switchElem, 0, sizeof(switchElem));
 548     switchElem.tag = SFLFLOW_EX_SWITCH;
 549     switchElem.flowType.sw.src_vlan = vlan_tci_to_vid(flow->vlan_tci);
 550     switchElem.flowType.sw.src_priority = vlan_tci_to_pcp(flow->vlan_tci);
 551
 552     /* Retrieve data from user_action_cookie. */
 553     vlan_tci = cookie->sflow.vlan_tci;
 554     switchElem.flowType.sw.dst_vlan = vlan_tci_to_vid(vlan_tci);
 555     switchElem.flowType.sw.dst_priority = vlan_tci_to_pcp(vlan_tci);
 556
 557     fs.output = cookie->sflow.output;
 558
 559     /* Submit the flow sample to be encoded into the next datagram. */
 560     SFLADD_ELEMENT(&fs, &hdrElem);
 561     SFLADD_ELEMENT(&fs, &switchElem);
 562     sfl_sampler_writeFlowSample(sampler, &fs);
 563 }
 564
 565 void
 566 dpif_sflow_run(struct dpif_sflow *ds)
 567 {
 568     if (dpif_sflow_is_enabled(ds)) {
 569         time_t now = time_now();
 570         route_table_run();
 571         if (now >= ds->next_tick) {
 572             sfl_agent_tick(ds->sflow_agent, time_wall());
 573             ds->next_tick = now + 1;
 574         }
 575     }
 576 }
 577
 578 void
 579 dpif_sflow_wait(struct dpif_sflow *ds)
 580 {
 581     if (dpif_sflow_is_enabled(ds)) {
 582         poll_timer_wait_until(ds->next_tick * 1000LL);
 583     }
 584 }