2 * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
3 * Copyright (c) 2009 InMon Corp.
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:
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 #include "ofproto-dpif-sflow.h"
21 #include <sys/socket.h>
24 #include "collectors.h"
34 #include "poll-loop.h"
35 #include "route-table.h"
36 #include "sflow_api.h"
37 #include "socket-util.h"
40 #include "lib/odp-util.h"
41 #include "ofproto-provider.h"
43 VLOG_DEFINE_THIS_MODULE(sflow);
45 static struct ovs_mutex mutex;
47 struct dpif_sflow_port {
48 struct hmap_node hmap_node; /* In struct dpif_sflow's "ports" hmap. */
49 SFLDataSource_instance dsi; /* sFlow library's notion of port number. */
50 struct ofport *ofport; /* To retrive port stats. */
55 struct collectors *collectors;
56 SFLAgent *sflow_agent;
57 struct ofproto_sflow_options *options;
59 size_t n_flood, n_all;
60 struct hmap ports; /* Contains "struct dpif_sflow_port"s. */
62 struct ovs_refcount ref_cnt;
65 static void dpif_sflow_del_port__(struct dpif_sflow *,
66 struct dpif_sflow_port *);
68 #define RECEIVER_INDEX 1
70 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
73 nullable_string_is_equal(const char *a, const char *b)
75 return a ? b && !strcmp(a, b) : !b;
79 ofproto_sflow_options_equal(const struct ofproto_sflow_options *a,
80 const struct ofproto_sflow_options *b)
82 return (sset_equals(&a->targets, &b->targets)
83 && a->sampling_rate == b->sampling_rate
84 && a->polling_interval == b->polling_interval
85 && a->header_len == b->header_len
86 && a->sub_id == b->sub_id
87 && nullable_string_is_equal(a->agent_device, b->agent_device)
88 && nullable_string_is_equal(a->control_ip, b->control_ip));
91 static struct ofproto_sflow_options *
92 ofproto_sflow_options_clone(const struct ofproto_sflow_options *old)
94 struct ofproto_sflow_options *new = xmemdup(old, sizeof *old);
95 sset_clone(&new->targets, &old->targets);
96 new->agent_device = old->agent_device ? xstrdup(old->agent_device) : NULL;
97 new->control_ip = old->control_ip ? xstrdup(old->control_ip) : NULL;
102 ofproto_sflow_options_destroy(struct ofproto_sflow_options *options)
105 sset_destroy(&options->targets);
106 free(options->agent_device);
107 free(options->control_ip);
112 /* sFlow library callback to allocate memory. */
114 sflow_agent_alloc_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
117 return calloc(1, bytes);
120 /* sFlow library callback to free memory. */
122 sflow_agent_free_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
129 /* sFlow library callback to report error. */
131 sflow_agent_error_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
134 VLOG_WARN("sFlow agent error: %s", msg);
137 /* sFlow library callback to send datagram. */
139 sflow_agent_send_packet_cb(void *ds_, SFLAgent *agent OVS_UNUSED,
140 SFLReceiver *receiver OVS_UNUSED, u_char *pkt,
143 struct dpif_sflow *ds = ds_;
144 collectors_send(ds->collectors, pkt, pktLen);
147 static struct dpif_sflow_port *
148 dpif_sflow_find_port(const struct dpif_sflow *ds, odp_port_t odp_port)
151 struct dpif_sflow_port *dsp;
153 HMAP_FOR_EACH_IN_BUCKET (dsp, hmap_node, hash_odp_port(odp_port),
155 if (dsp->odp_port == odp_port) {
163 sflow_agent_get_counters(void *ds_, SFLPoller *poller,
164 SFL_COUNTERS_SAMPLE_TYPE *cs)
167 struct dpif_sflow *ds = ds_;
168 SFLCounters_sample_element elem;
169 enum netdev_features current;
170 struct dpif_sflow_port *dsp;
171 SFLIf_counters *counters;
172 struct netdev_stats stats;
173 enum netdev_flags flags;
175 dsp = dpif_sflow_find_port(ds, u32_to_odp(poller->bridgePort));
180 elem.tag = SFLCOUNTERS_GENERIC;
181 counters = &elem.counterBlock.generic;
182 counters->ifIndex = SFL_DS_INDEX(poller->dsi);
183 counters->ifType = 6;
184 if (!netdev_get_features(dsp->ofport->netdev, ¤t, NULL, NULL, NULL)) {
185 /* The values of ifDirection come from MAU MIB (RFC 2668): 0 = unknown,
186 1 = full-duplex, 2 = half-duplex, 3 = in, 4=out */
187 counters->ifSpeed = netdev_features_to_bps(current, 0);
188 counters->ifDirection = (netdev_features_is_full_duplex(current)
191 counters->ifSpeed = 100000000;
192 counters->ifDirection = 0;
194 if (!netdev_get_flags(dsp->ofport->netdev, &flags) && flags & NETDEV_UP) {
195 counters->ifStatus = 1; /* ifAdminStatus up. */
196 if (netdev_get_carrier(dsp->ofport->netdev)) {
197 counters->ifStatus |= 2; /* ifOperStatus us. */
200 counters->ifStatus = 0; /* Down. */
204 1. Is the multicast counter filled in?
205 2. Does the multicast counter include broadcasts?
206 3. Does the rx_packets counter include multicasts/broadcasts?
208 ofproto_port_get_stats(dsp->ofport, &stats);
209 counters->ifInOctets = stats.rx_bytes;
210 counters->ifInUcastPkts = stats.rx_packets;
211 counters->ifInMulticastPkts = stats.multicast;
212 counters->ifInBroadcastPkts = -1;
213 counters->ifInDiscards = stats.rx_dropped;
214 counters->ifInErrors = stats.rx_errors;
215 counters->ifInUnknownProtos = -1;
216 counters->ifOutOctets = stats.tx_bytes;
217 counters->ifOutUcastPkts = stats.tx_packets;
218 counters->ifOutMulticastPkts = -1;
219 counters->ifOutBroadcastPkts = -1;
220 counters->ifOutDiscards = stats.tx_dropped;
221 counters->ifOutErrors = stats.tx_errors;
222 counters->ifPromiscuousMode = 0;
224 SFLADD_ELEMENT(cs, &elem);
225 sfl_poller_writeCountersSample(poller, cs);
228 /* Obtains an address to use for the local sFlow agent and stores it into
229 * '*agent_addr'. Returns true if successful, false on failure.
231 * The sFlow agent address should be a local IP address that is persistent and
232 * reachable over the network, if possible. The IP address associated with
233 * 'agent_device' is used if it has one, and otherwise 'control_ip', the IP
234 * address used to talk to the controller. If the agent device is not
235 * specified then it is figured out by taking a look at the routing table based
238 sflow_choose_agent_address(const char *agent_device,
239 const struct sset *targets,
240 const char *control_ip,
241 SFLAddress *agent_addr)
246 memset(agent_addr, 0, sizeof *agent_addr);
247 agent_addr->type = SFLADDRESSTYPE_IP_V4;
250 if (!netdev_get_in4_by_name(agent_device, &in4)) {
255 SSET_FOR_EACH (target, targets) {
257 struct sockaddr_storage ss;
258 struct sockaddr_in sin;
262 if (inet_parse_active(target, SFL_DEFAULT_COLLECTOR_PORT, &sa.ss)
263 && sa.ss.ss_family == AF_INET) {
264 if (route_table_get_name(sa.sin.sin_addr.s_addr, name)
265 && !netdev_get_in4_by_name(name, &in4)) {
271 if (control_ip && !lookup_ip(control_ip, &in4)) {
275 VLOG_ERR("could not determine IP address for sFlow agent");
279 agent_addr->address.ip_v4.addr = (OVS_FORCE uint32_t) in4.s_addr;
284 dpif_sflow_clear__(struct dpif_sflow *ds) OVS_REQUIRES(mutex)
286 if (ds->sflow_agent) {
287 sfl_agent_release(ds->sflow_agent);
288 free(ds->sflow_agent);
289 ds->sflow_agent = NULL;
291 collectors_destroy(ds->collectors);
292 ds->collectors = NULL;
293 ofproto_sflow_options_destroy(ds->options);
296 /* Turn off sampling to save CPU cycles. */
301 dpif_sflow_clear(struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
303 ovs_mutex_lock(&mutex);
304 dpif_sflow_clear__(ds);
305 ovs_mutex_unlock(&mutex);
309 dpif_sflow_is_enabled(const struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
313 ovs_mutex_lock(&mutex);
314 enabled = ds->collectors != NULL;
315 ovs_mutex_unlock(&mutex);
320 dpif_sflow_create(void)
322 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
323 struct dpif_sflow *ds;
325 if (ovsthread_once_start(&once)) {
326 ovs_mutex_init_recursive(&mutex);
327 ovsthread_once_done(&once);
330 ds = xcalloc(1, sizeof *ds);
331 ds->next_tick = time_now() + 1;
332 hmap_init(&ds->ports);
334 route_table_register();
335 ovs_refcount_init(&ds->ref_cnt);
341 dpif_sflow_ref(const struct dpif_sflow *ds_)
343 struct dpif_sflow *ds = CONST_CAST(struct dpif_sflow *, ds_);
345 ovs_refcount_ref(&ds->ref_cnt);
350 /* 32-bit fraction of packets to sample with. A value of 0 samples no packets,
351 * a value of %UINT32_MAX samples all packets and intermediate values sample
352 * intermediate fractions of packets. */
354 dpif_sflow_get_probability(const struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
356 uint32_t probability;
357 ovs_mutex_lock(&mutex);
358 probability = ds->probability;
359 ovs_mutex_unlock(&mutex);
364 dpif_sflow_unref(struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
366 if (ds && ovs_refcount_unref_relaxed(&ds->ref_cnt) == 1) {
367 struct dpif_sflow_port *dsp, *next;
369 route_table_unregister();
370 dpif_sflow_clear(ds);
371 HMAP_FOR_EACH_SAFE (dsp, next, hmap_node, &ds->ports) {
372 dpif_sflow_del_port__(ds, dsp);
374 hmap_destroy(&ds->ports);
380 dpif_sflow_add_poller(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
383 SFLPoller *poller = sfl_agent_addPoller(ds->sflow_agent, &dsp->dsi, ds,
384 sflow_agent_get_counters);
385 sfl_poller_set_sFlowCpInterval(poller, ds->options->polling_interval);
386 sfl_poller_set_sFlowCpReceiver(poller, RECEIVER_INDEX);
387 sfl_poller_set_bridgePort(poller, odp_to_u32(dsp->odp_port));
391 dpif_sflow_add_port(struct dpif_sflow *ds, struct ofport *ofport,
392 odp_port_t odp_port) OVS_EXCLUDED(mutex)
394 struct dpif_sflow_port *dsp;
397 ovs_mutex_lock(&mutex);
398 dpif_sflow_del_port(ds, odp_port);
400 ifindex = netdev_get_ifindex(ofport->netdev);
403 /* Not an ifindex port, so do not add a cross-reference to it here */
407 /* Add to table of ports. */
408 dsp = xmalloc(sizeof *dsp);
409 dsp->ofport = ofport;
410 dsp->odp_port = odp_port;
411 SFL_DS_SET(dsp->dsi, SFL_DSCLASS_IFINDEX, ifindex, 0);
412 hmap_insert(&ds->ports, &dsp->hmap_node, hash_odp_port(odp_port));
415 if (ds->sflow_agent) {
416 dpif_sflow_add_poller(ds, dsp);
420 ovs_mutex_unlock(&mutex);
424 dpif_sflow_del_port__(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
427 if (ds->sflow_agent) {
428 sfl_agent_removePoller(ds->sflow_agent, &dsp->dsi);
429 sfl_agent_removeSampler(ds->sflow_agent, &dsp->dsi);
431 hmap_remove(&ds->ports, &dsp->hmap_node);
436 dpif_sflow_del_port(struct dpif_sflow *ds, odp_port_t odp_port)
439 struct dpif_sflow_port *dsp;
441 ovs_mutex_lock(&mutex);
442 dsp = dpif_sflow_find_port(ds, odp_port);
444 dpif_sflow_del_port__(ds, dsp);
446 ovs_mutex_unlock(&mutex);
450 dpif_sflow_set_options(struct dpif_sflow *ds,
451 const struct ofproto_sflow_options *options)
454 struct dpif_sflow_port *dsp;
455 bool options_changed;
456 SFLReceiver *receiver;
459 SFLDataSource_instance dsi;
463 ovs_mutex_lock(&mutex);
464 if (sset_is_empty(&options->targets) || !options->sampling_rate) {
465 /* No point in doing any work if there are no targets or nothing to
467 dpif_sflow_clear__(ds);
471 options_changed = (!ds->options
472 || !ofproto_sflow_options_equal(options, ds->options));
474 /* Configure collectors if options have changed or if we're shortchanged in
475 * collectors (which indicates that opening one or more of the configured
476 * collectors failed, so that we should retry). */
478 || collectors_count(ds->collectors) < sset_count(&options->targets)) {
479 collectors_destroy(ds->collectors);
480 collectors_create(&options->targets, SFL_DEFAULT_COLLECTOR_PORT,
482 if (ds->collectors == NULL) {
483 VLOG_WARN_RL(&rl, "no collectors could be initialized, "
485 dpif_sflow_clear__(ds);
490 /* Choose agent IP address and agent device (if not yet setup) */
491 if (!sflow_choose_agent_address(options->agent_device,
493 options->control_ip, &agentIP)) {
494 dpif_sflow_clear__(ds);
498 /* Avoid reconfiguring if options didn't change. */
499 if (!options_changed) {
502 ofproto_sflow_options_destroy(ds->options);
503 ds->options = ofproto_sflow_options_clone(options);
506 VLOG_INFO("creating sFlow agent %d", options->sub_id);
507 if (ds->sflow_agent) {
508 sfl_agent_release(ds->sflow_agent);
510 ds->sflow_agent = xcalloc(1, sizeof *ds->sflow_agent);
512 sfl_agent_init(ds->sflow_agent,
515 now, /* Boot time. */
516 now, /* Current time. */
517 ds, /* Pointer supplied to callbacks. */
518 sflow_agent_alloc_cb,
520 sflow_agent_error_cb,
521 sflow_agent_send_packet_cb);
523 receiver = sfl_agent_addReceiver(ds->sflow_agent);
524 sfl_receiver_set_sFlowRcvrOwner(receiver, "Open vSwitch sFlow");
525 sfl_receiver_set_sFlowRcvrTimeout(receiver, 0xffffffff);
527 /* Set the sampling_rate down in the datapath. */
528 ds->probability = MAX(1, UINT32_MAX / ds->options->sampling_rate);
530 /* Add a single sampler for the bridge. This appears as a PHYSICAL_ENTITY
531 because it is associated with the hypervisor, and interacts with the server
532 hardware directly. The sub_id is used to distinguish this sampler from
533 others on other bridges within the same agent. */
534 dsIndex = 1000 + options->sub_id;
535 SFL_DS_SET(dsi, SFL_DSCLASS_PHYSICAL_ENTITY, dsIndex, 0);
536 sampler = sfl_agent_addSampler(ds->sflow_agent, &dsi);
537 sfl_sampler_set_sFlowFsPacketSamplingRate(sampler, ds->options->sampling_rate);
538 sfl_sampler_set_sFlowFsMaximumHeaderSize(sampler, ds->options->header_len);
539 sfl_sampler_set_sFlowFsReceiver(sampler, RECEIVER_INDEX);
541 /* Add pollers for the currently known ifindex-ports */
542 HMAP_FOR_EACH (dsp, hmap_node, &ds->ports) {
543 dpif_sflow_add_poller(ds, dsp);
548 ovs_mutex_unlock(&mutex);
552 dpif_sflow_odp_port_to_ifindex(const struct dpif_sflow *ds,
553 odp_port_t odp_port) OVS_EXCLUDED(mutex)
555 struct dpif_sflow_port *dsp;
558 ovs_mutex_lock(&mutex);
559 dsp = dpif_sflow_find_port(ds, odp_port);
560 ret = dsp ? SFL_DS_INDEX(dsp->dsi) : 0;
561 ovs_mutex_unlock(&mutex);
566 dpif_sflow_received(struct dpif_sflow *ds, struct ofpbuf *packet,
567 const struct flow *flow, odp_port_t odp_in_port,
568 const union user_action_cookie *cookie)
571 SFL_FLOW_SAMPLE_TYPE fs;
572 SFLFlow_sample_element hdrElem;
573 SFLSampled_header *header;
574 SFLFlow_sample_element switchElem;
576 struct dpif_sflow_port *in_dsp;
579 ovs_mutex_lock(&mutex);
580 sampler = ds->sflow_agent->samplers;
585 /* Build a flow sample. */
586 memset(&fs, 0, sizeof fs);
588 /* Look up the input ifIndex if this port has one. Otherwise just
589 * leave it as 0 (meaning 'unknown') and continue. */
590 in_dsp = dpif_sflow_find_port(ds, odp_in_port);
592 fs.input = SFL_DS_INDEX(in_dsp->dsi);
595 /* Make the assumption that the random number generator in the datapath converges
596 * to the configured mean, and just increment the samplePool by the configured
597 * sampling rate every time. */
598 sampler->samplePool += sfl_sampler_get_sFlowFsPacketSamplingRate(sampler);
600 /* Sampled header. */
601 memset(&hdrElem, 0, sizeof hdrElem);
602 hdrElem.tag = SFLFLOW_HEADER;
603 header = &hdrElem.flowType.header;
604 header->header_protocol = SFLHEADER_ETHERNET_ISO8023;
605 /* The frame_length should include the Ethernet FCS (4 bytes),
606 * but it has already been stripped, so we need to add 4 here. */
607 header->frame_length = ofpbuf_size(packet) + 4;
608 /* Ethernet FCS stripped off. */
609 header->stripped = 4;
610 header->header_length = MIN(ofpbuf_size(packet),
611 sampler->sFlowFsMaximumHeaderSize);
612 header->header_bytes = ofpbuf_data(packet);
614 /* Add extended switch element. */
615 memset(&switchElem, 0, sizeof(switchElem));
616 switchElem.tag = SFLFLOW_EX_SWITCH;
617 switchElem.flowType.sw.src_vlan = vlan_tci_to_vid(flow->vlan_tci);
618 switchElem.flowType.sw.src_priority = vlan_tci_to_pcp(flow->vlan_tci);
620 /* Retrieve data from user_action_cookie. */
621 vlan_tci = cookie->sflow.vlan_tci;
622 switchElem.flowType.sw.dst_vlan = vlan_tci_to_vid(vlan_tci);
623 switchElem.flowType.sw.dst_priority = vlan_tci_to_pcp(vlan_tci);
625 fs.output = cookie->sflow.output;
627 /* Submit the flow sample to be encoded into the next datagram. */
628 SFLADD_ELEMENT(&fs, &hdrElem);
629 SFLADD_ELEMENT(&fs, &switchElem);
630 sfl_sampler_writeFlowSample(sampler, &fs);
633 ovs_mutex_unlock(&mutex);
637 dpif_sflow_run(struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
639 ovs_mutex_lock(&mutex);
640 if (ds->collectors != NULL) {
641 time_t now = time_now();
643 if (now >= ds->next_tick) {
644 sfl_agent_tick(ds->sflow_agent, time_wall());
645 ds->next_tick = now + 1;
648 ovs_mutex_unlock(&mutex);
652 dpif_sflow_wait(struct dpif_sflow *ds) OVS_EXCLUDED(mutex)
654 ovs_mutex_lock(&mutex);
655 if (ds->collectors != NULL) {
656 poll_timer_wait_until(ds->next_tick * 1000LL);
658 ovs_mutex_unlock(&mutex);