2 * Copyright (c) 2009, 2010, 2011, 2012 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 struct dpif_sflow_port {
46 struct hmap_node hmap_node; /* In struct dpif_sflow's "ports" hmap. */
47 SFLDataSource_instance dsi; /* sFlow library's notion of port number. */
48 struct ofport *ofport; /* To retrive port stats. */
53 struct collectors *collectors;
54 SFLAgent *sflow_agent;
55 struct ofproto_sflow_options *options;
57 size_t n_flood, n_all;
58 struct hmap ports; /* Contains "struct dpif_sflow_port"s. */
62 static void dpif_sflow_del_port__(struct dpif_sflow *,
63 struct dpif_sflow_port *);
65 #define RECEIVER_INDEX 1
67 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
70 nullable_string_is_equal(const char *a, const char *b)
72 return a ? b && !strcmp(a, b) : !b;
76 ofproto_sflow_options_equal(const struct ofproto_sflow_options *a,
77 const struct ofproto_sflow_options *b)
79 return (sset_equals(&a->targets, &b->targets)
80 && a->sampling_rate == b->sampling_rate
81 && a->polling_interval == b->polling_interval
82 && a->header_len == b->header_len
83 && a->sub_id == b->sub_id
84 && nullable_string_is_equal(a->agent_device, b->agent_device)
85 && nullable_string_is_equal(a->control_ip, b->control_ip));
88 static struct ofproto_sflow_options *
89 ofproto_sflow_options_clone(const struct ofproto_sflow_options *old)
91 struct ofproto_sflow_options *new = xmemdup(old, sizeof *old);
92 sset_clone(&new->targets, &old->targets);
93 new->agent_device = old->agent_device ? xstrdup(old->agent_device) : NULL;
94 new->control_ip = old->control_ip ? xstrdup(old->control_ip) : NULL;
99 ofproto_sflow_options_destroy(struct ofproto_sflow_options *options)
102 sset_destroy(&options->targets);
103 free(options->agent_device);
104 free(options->control_ip);
109 /* sFlow library callback to allocate memory. */
111 sflow_agent_alloc_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
114 return calloc(1, bytes);
117 /* sFlow library callback to free memory. */
119 sflow_agent_free_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
126 /* sFlow library callback to report error. */
128 sflow_agent_error_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
131 VLOG_WARN("sFlow agent error: %s", msg);
134 /* sFlow library callback to send datagram. */
136 sflow_agent_send_packet_cb(void *ds_, SFLAgent *agent OVS_UNUSED,
137 SFLReceiver *receiver OVS_UNUSED, u_char *pkt,
140 struct dpif_sflow *ds = ds_;
141 collectors_send(ds->collectors, pkt, pktLen);
144 static struct dpif_sflow_port *
145 dpif_sflow_find_port(const struct dpif_sflow *ds, odp_port_t odp_port)
147 struct dpif_sflow_port *dsp;
149 HMAP_FOR_EACH_IN_BUCKET (dsp, hmap_node, hash_odp_port(odp_port),
151 if (dsp->odp_port == odp_port) {
159 sflow_agent_get_counters(void *ds_, SFLPoller *poller,
160 SFL_COUNTERS_SAMPLE_TYPE *cs)
162 struct dpif_sflow *ds = ds_;
163 SFLCounters_sample_element elem;
164 enum netdev_features current;
165 struct dpif_sflow_port *dsp;
166 SFLIf_counters *counters;
167 struct netdev_stats stats;
168 enum netdev_flags flags;
170 dsp = dpif_sflow_find_port(ds, u32_to_odp(poller->bridgePort));
175 elem.tag = SFLCOUNTERS_GENERIC;
176 counters = &elem.counterBlock.generic;
177 counters->ifIndex = SFL_DS_INDEX(poller->dsi);
178 counters->ifType = 6;
179 if (!netdev_get_features(dsp->ofport->netdev, ¤t, NULL, NULL, NULL)) {
180 /* The values of ifDirection come from MAU MIB (RFC 2668): 0 = unknown,
181 1 = full-duplex, 2 = half-duplex, 3 = in, 4=out */
182 counters->ifSpeed = netdev_features_to_bps(current, 0);
183 counters->ifDirection = (netdev_features_is_full_duplex(current)
186 counters->ifSpeed = 100000000;
187 counters->ifDirection = 0;
189 if (!netdev_get_flags(dsp->ofport->netdev, &flags) && flags & NETDEV_UP) {
190 counters->ifStatus = 1; /* ifAdminStatus up. */
191 if (netdev_get_carrier(dsp->ofport->netdev)) {
192 counters->ifStatus |= 2; /* ifOperStatus us. */
195 counters->ifStatus = 0; /* Down. */
199 1. Is the multicast counter filled in?
200 2. Does the multicast counter include broadcasts?
201 3. Does the rx_packets counter include multicasts/broadcasts?
203 ofproto_port_get_stats(dsp->ofport, &stats);
204 counters->ifInOctets = stats.rx_bytes;
205 counters->ifInUcastPkts = stats.rx_packets;
206 counters->ifInMulticastPkts = stats.multicast;
207 counters->ifInBroadcastPkts = -1;
208 counters->ifInDiscards = stats.rx_dropped;
209 counters->ifInErrors = stats.rx_errors;
210 counters->ifInUnknownProtos = -1;
211 counters->ifOutOctets = stats.tx_bytes;
212 counters->ifOutUcastPkts = stats.tx_packets;
213 counters->ifOutMulticastPkts = -1;
214 counters->ifOutBroadcastPkts = -1;
215 counters->ifOutDiscards = stats.tx_dropped;
216 counters->ifOutErrors = stats.tx_errors;
217 counters->ifPromiscuousMode = 0;
219 SFLADD_ELEMENT(cs, &elem);
220 sfl_poller_writeCountersSample(poller, cs);
223 /* Obtains an address to use for the local sFlow agent and stores it into
224 * '*agent_addr'. Returns true if successful, false on failure.
226 * The sFlow agent address should be a local IP address that is persistent and
227 * reachable over the network, if possible. The IP address associated with
228 * 'agent_device' is used if it has one, and otherwise 'control_ip', the IP
229 * address used to talk to the controller. If the agent device is not
230 * specified then it is figured out by taking a look at the routing table based
233 sflow_choose_agent_address(const char *agent_device,
234 const struct sset *targets,
235 const char *control_ip,
236 SFLAddress *agent_addr)
241 memset(agent_addr, 0, sizeof *agent_addr);
242 agent_addr->type = SFLADDRESSTYPE_IP_V4;
245 if (!netdev_get_in4_by_name(agent_device, &in4)) {
250 SSET_FOR_EACH (target, targets) {
251 struct sockaddr_in sin;
254 if (inet_parse_active(target, SFL_DEFAULT_COLLECTOR_PORT, &sin)
255 && route_table_get_name(sin.sin_addr.s_addr, name)
256 && !netdev_get_in4_by_name(name, &in4)) {
261 if (control_ip && !lookup_ip(control_ip, &in4)) {
265 VLOG_ERR("could not determine IP address for sFlow agent");
269 agent_addr->address.ip_v4.addr = (OVS_FORCE uint32_t) in4.s_addr;
274 dpif_sflow_clear(struct dpif_sflow *ds)
276 if (ds->sflow_agent) {
277 sfl_agent_release(ds->sflow_agent);
278 ds->sflow_agent = NULL;
280 collectors_destroy(ds->collectors);
281 ds->collectors = NULL;
282 ofproto_sflow_options_destroy(ds->options);
285 /* Turn off sampling to save CPU cycles. */
290 dpif_sflow_is_enabled(const struct dpif_sflow *ds)
292 return ds->collectors != NULL;
296 dpif_sflow_create(void)
298 struct dpif_sflow *ds;
300 ds = xcalloc(1, sizeof *ds);
301 ds->next_tick = time_now() + 1;
302 hmap_init(&ds->ports);
304 route_table_register();
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. */
313 dpif_sflow_get_probability(const struct dpif_sflow *ds)
315 return ds->probability;
319 dpif_sflow_destroy(struct dpif_sflow *ds)
322 struct dpif_sflow_port *dsp, *next;
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);
329 hmap_destroy(&ds->ports);
335 dpif_sflow_add_poller(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
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, odp_to_u32(dsp->odp_port));
345 dpif_sflow_add_port(struct dpif_sflow *ds, struct ofport *ofport,
348 struct dpif_sflow_port *dsp;
351 dpif_sflow_del_port(ds, odp_port);
353 ifindex = netdev_get_ifindex(ofport->netdev);
356 /* Not an ifindex port, so do not add a cross-reference to it here */
360 /* Add to table of ports. */
361 dsp = xmalloc(sizeof *dsp);
362 dsp->ofport = ofport;
363 dsp->odp_port = odp_port;
364 SFL_DS_SET(dsp->dsi, SFL_DSCLASS_IFINDEX, ifindex, 0);
365 hmap_insert(&ds->ports, &dsp->hmap_node, hash_odp_port(odp_port));
368 if (ds->sflow_agent) {
369 dpif_sflow_add_poller(ds, dsp);
374 dpif_sflow_del_port__(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
376 if (ds->sflow_agent) {
377 sfl_agent_removePoller(ds->sflow_agent, &dsp->dsi);
378 sfl_agent_removeSampler(ds->sflow_agent, &dsp->dsi);
380 hmap_remove(&ds->ports, &dsp->hmap_node);
385 dpif_sflow_del_port(struct dpif_sflow *ds, odp_port_t odp_port)
387 struct dpif_sflow_port *dsp = dpif_sflow_find_port(ds, odp_port);
389 dpif_sflow_del_port__(ds, dsp);
394 dpif_sflow_set_options(struct dpif_sflow *ds,
395 const struct ofproto_sflow_options *options)
397 struct dpif_sflow_port *dsp;
398 bool options_changed;
399 SFLReceiver *receiver;
402 SFLDataSource_instance dsi;
406 if (sset_is_empty(&options->targets) || !options->sampling_rate) {
407 /* No point in doing any work if there are no targets or nothing to
409 dpif_sflow_clear(ds);
413 options_changed = (!ds->options
414 || !ofproto_sflow_options_equal(options, ds->options));
416 /* Configure collectors if options have changed or if we're shortchanged in
417 * collectors (which indicates that opening one or more of the configured
418 * collectors failed, so that we should retry). */
420 || collectors_count(ds->collectors) < sset_count(&options->targets)) {
421 collectors_destroy(ds->collectors);
422 collectors_create(&options->targets, SFL_DEFAULT_COLLECTOR_PORT,
424 if (ds->collectors == NULL) {
425 VLOG_WARN_RL(&rl, "no collectors could be initialized, "
427 dpif_sflow_clear(ds);
432 /* Choose agent IP address and agent device (if not yet setup) */
433 if (!sflow_choose_agent_address(options->agent_device,
435 options->control_ip, &agentIP)) {
436 dpif_sflow_clear(ds);
440 /* Avoid reconfiguring if options didn't change. */
441 if (!options_changed) {
444 ofproto_sflow_options_destroy(ds->options);
445 ds->options = ofproto_sflow_options_clone(options);
448 VLOG_INFO("creating sFlow agent %d", options->sub_id);
449 if (ds->sflow_agent) {
450 sfl_agent_release(ds->sflow_agent);
452 ds->sflow_agent = xcalloc(1, sizeof *ds->sflow_agent);
454 sfl_agent_init(ds->sflow_agent,
457 now, /* Boot time. */
458 now, /* Current time. */
459 ds, /* Pointer supplied to callbacks. */
460 sflow_agent_alloc_cb,
462 sflow_agent_error_cb,
463 sflow_agent_send_packet_cb);
465 receiver = sfl_agent_addReceiver(ds->sflow_agent);
466 sfl_receiver_set_sFlowRcvrOwner(receiver, "Open vSwitch sFlow");
467 sfl_receiver_set_sFlowRcvrTimeout(receiver, 0xffffffff);
469 /* Set the sampling_rate down in the datapath. */
470 ds->probability = MAX(1, UINT32_MAX / ds->options->sampling_rate);
472 /* Add a single sampler for the bridge. This appears as a PHYSICAL_ENTITY
473 because it is associated with the hypervisor, and interacts with the server
474 hardware directly. The sub_id is used to distinguish this sampler from
475 others on other bridges within the same agent. */
476 dsIndex = 1000 + options->sub_id;
477 SFL_DS_SET(dsi, SFL_DSCLASS_PHYSICAL_ENTITY, dsIndex, 0);
478 sampler = sfl_agent_addSampler(ds->sflow_agent, &dsi);
479 sfl_sampler_set_sFlowFsPacketSamplingRate(sampler, ds->options->sampling_rate);
480 sfl_sampler_set_sFlowFsMaximumHeaderSize(sampler, ds->options->header_len);
481 sfl_sampler_set_sFlowFsReceiver(sampler, RECEIVER_INDEX);
483 /* Add pollers for the currently known ifindex-ports */
484 HMAP_FOR_EACH (dsp, hmap_node, &ds->ports) {
485 dpif_sflow_add_poller(ds, dsp);
490 dpif_sflow_odp_port_to_ifindex(const struct dpif_sflow *ds,
493 struct dpif_sflow_port *dsp = dpif_sflow_find_port(ds, odp_port);
494 return dsp ? SFL_DS_INDEX(dsp->dsi) : 0;
498 dpif_sflow_received(struct dpif_sflow *ds, struct ofpbuf *packet,
499 const struct flow *flow, odp_port_t odp_in_port,
500 const union user_action_cookie *cookie)
502 SFL_FLOW_SAMPLE_TYPE fs;
503 SFLFlow_sample_element hdrElem;
504 SFLSampled_header *header;
505 SFLFlow_sample_element switchElem;
507 struct dpif_sflow_port *in_dsp;
510 sampler = ds->sflow_agent->samplers;
515 /* Build a flow sample. */
516 memset(&fs, 0, sizeof fs);
518 /* Look up the input ifIndex if this port has one. Otherwise just
519 * leave it as 0 (meaning 'unknown') and continue. */
520 in_dsp = dpif_sflow_find_port(ds, odp_in_port);
522 fs.input = SFL_DS_INDEX(in_dsp->dsi);
525 /* Make the assumption that the random number generator in the datapath converges
526 * to the configured mean, and just increment the samplePool by the configured
527 * sampling rate every time. */
528 sampler->samplePool += sfl_sampler_get_sFlowFsPacketSamplingRate(sampler);
530 /* Sampled header. */
531 memset(&hdrElem, 0, sizeof hdrElem);
532 hdrElem.tag = SFLFLOW_HEADER;
533 header = &hdrElem.flowType.header;
534 header->header_protocol = SFLHEADER_ETHERNET_ISO8023;
535 /* The frame_length should include the Ethernet FCS (4 bytes),
536 * but it has already been stripped, so we need to add 4 here. */
537 header->frame_length = packet->size + 4;
538 /* Ethernet FCS stripped off. */
539 header->stripped = 4;
540 header->header_length = MIN(packet->size,
541 sampler->sFlowFsMaximumHeaderSize);
542 header->header_bytes = packet->data;
544 /* Add extended switch element. */
545 memset(&switchElem, 0, sizeof(switchElem));
546 switchElem.tag = SFLFLOW_EX_SWITCH;
547 switchElem.flowType.sw.src_vlan = vlan_tci_to_vid(flow->vlan_tci);
548 switchElem.flowType.sw.src_priority = vlan_tci_to_pcp(flow->vlan_tci);
550 /* Retrieve data from user_action_cookie. */
551 vlan_tci = cookie->sflow.vlan_tci;
552 switchElem.flowType.sw.dst_vlan = vlan_tci_to_vid(vlan_tci);
553 switchElem.flowType.sw.dst_priority = vlan_tci_to_pcp(vlan_tci);
555 fs.output = cookie->sflow.output;
557 /* Submit the flow sample to be encoded into the next datagram. */
558 SFLADD_ELEMENT(&fs, &hdrElem);
559 SFLADD_ELEMENT(&fs, &switchElem);
560 sfl_sampler_writeFlowSample(sampler, &fs);
564 dpif_sflow_run(struct dpif_sflow *ds)
566 if (dpif_sflow_is_enabled(ds)) {
567 time_t now = time_now();
569 if (now >= ds->next_tick) {
570 sfl_agent_tick(ds->sflow_agent, time_wall());
571 ds->next_tick = now + 1;
577 dpif_sflow_wait(struct dpif_sflow *ds)
579 if (dpif_sflow_is_enabled(ds)) {
580 poll_timer_wait_until(ds->next_tick * 1000LL);