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/*
* Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
* Copyright (c) 2009 InMon Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "ofproto-dpif-sflow.h"
#include <inttypes.h>
#include <sys/socket.h>
#include <net/if.h>
#include <stdlib.h>
#include "collectors.h"
#include "compiler.h"
#include "dpif.h"
#include "hash.h"
#include "hmap.h"
#include "netdev.h"
#include "netlink.h"
#include "ofpbuf.h"
#include "ofproto.h"
#include "packets.h"
#include "poll-loop.h"
#include "route-table.h"
#include "sflow_api.h"
#include "socket-util.h"
#include "timeval.h"
#include "vlog.h"
#include "lib/odp-util.h"
#include "ofproto-provider.h"
VLOG_DEFINE_THIS_MODULE(sflow);
struct dpif_sflow_port {
struct hmap_node hmap_node; /* In struct dpif_sflow's "ports" hmap. */
SFLDataSource_instance dsi; /* sFlow library's notion of port number. */
struct ofport *ofport; /* To retrive port stats. */
};
struct dpif_sflow {
struct collectors *collectors;
SFLAgent *sflow_agent;
struct ofproto_sflow_options *options;
struct dpif *dpif;
time_t next_tick;
size_t n_flood, n_all;
struct hmap ports; /* Contains "struct dpif_sflow_port"s. */
uint32_t probability;
};
static void dpif_sflow_del_port__(struct dpif_sflow *,
struct dpif_sflow_port *);
#define RECEIVER_INDEX 1
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
static bool
nullable_string_is_equal(const char *a, const char *b)
{
return a ? b && !strcmp(a, b) : !b;
}
static bool
ofproto_sflow_options_equal(const struct ofproto_sflow_options *a,
const struct ofproto_sflow_options *b)
{
return (sset_equals(&a->targets, &b->targets)
&& a->sampling_rate == b->sampling_rate
&& a->polling_interval == b->polling_interval
&& a->header_len == b->header_len
&& a->sub_id == b->sub_id
&& nullable_string_is_equal(a->agent_device, b->agent_device)
&& nullable_string_is_equal(a->control_ip, b->control_ip));
}
static struct ofproto_sflow_options *
ofproto_sflow_options_clone(const struct ofproto_sflow_options *old)
{
struct ofproto_sflow_options *new = xmemdup(old, sizeof *old);
sset_clone(&new->targets, &old->targets);
new->agent_device = old->agent_device ? xstrdup(old->agent_device) : NULL;
new->control_ip = old->control_ip ? xstrdup(old->control_ip) : NULL;
return new;
}
static void
ofproto_sflow_options_destroy(struct ofproto_sflow_options *options)
{
if (options) {
sset_destroy(&options->targets);
free(options->agent_device);
free(options->control_ip);
free(options);
}
}
/* sFlow library callback to allocate memory. */
static void *
sflow_agent_alloc_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
size_t bytes)
{
return calloc(1, bytes);
}
/* sFlow library callback to free memory. */
static int
sflow_agent_free_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
void *obj)
{
free(obj);
return 0;
}
/* sFlow library callback to report error. */
static void
sflow_agent_error_cb(void *magic OVS_UNUSED, SFLAgent *agent OVS_UNUSED,
char *msg)
{
VLOG_WARN("sFlow agent error: %s", msg);
}
/* sFlow library callback to send datagram. */
static void
sflow_agent_send_packet_cb(void *ds_, SFLAgent *agent OVS_UNUSED,
SFLReceiver *receiver OVS_UNUSED, u_char *pkt,
uint32_t pktLen)
{
struct dpif_sflow *ds = ds_;
collectors_send(ds->collectors, pkt, pktLen);
}
static struct dpif_sflow_port *
dpif_sflow_find_port(const struct dpif_sflow *ds, uint16_t odp_port)
{
struct dpif_sflow_port *dsp;
HMAP_FOR_EACH_IN_BUCKET (dsp, hmap_node,
hash_int(odp_port, 0), &ds->ports) {
if (ofp_port_to_odp_port(dsp->ofport->ofp_port) == odp_port) {
return dsp;
}
}
return NULL;
}
static void
sflow_agent_get_counters(void *ds_, SFLPoller *poller,
SFL_COUNTERS_SAMPLE_TYPE *cs)
{
struct dpif_sflow *ds = ds_;
SFLCounters_sample_element elem;
enum netdev_features current;
struct dpif_sflow_port *dsp;
SFLIf_counters *counters;
struct netdev_stats stats;
enum netdev_flags flags;
dsp = dpif_sflow_find_port(ds, poller->bridgePort);
if (!dsp) {
return;
}
elem.tag = SFLCOUNTERS_GENERIC;
counters = &elem.counterBlock.generic;
counters->ifIndex = SFL_DS_INDEX(poller->dsi);
counters->ifType = 6;
if (!netdev_get_features(dsp->ofport->netdev, &current, NULL, NULL, NULL)) {
/* The values of ifDirection come from MAU MIB (RFC 2668): 0 = unknown,
1 = full-duplex, 2 = half-duplex, 3 = in, 4=out */
counters->ifSpeed = netdev_features_to_bps(current);
counters->ifDirection = (netdev_features_is_full_duplex(current)
? 1 : 2);
} else {
counters->ifSpeed = 100000000;
counters->ifDirection = 0;
}
if (!netdev_get_flags(dsp->ofport->netdev, &flags) && flags & NETDEV_UP) {
counters->ifStatus = 1; /* ifAdminStatus up. */
if (netdev_get_carrier(dsp->ofport->netdev)) {
counters->ifStatus |= 2; /* ifOperStatus us. */
}
} else {
counters->ifStatus = 0; /* Down. */
}
/* XXX
1. Is the multicast counter filled in?
2. Does the multicast counter include broadcasts?
3. Does the rx_packets counter include multicasts/broadcasts?
*/
ofproto_port_get_stats(dsp->ofport, &stats);
counters->ifInOctets = stats.rx_bytes;
counters->ifInUcastPkts = stats.rx_packets;
counters->ifInMulticastPkts = stats.multicast;
counters->ifInBroadcastPkts = -1;
counters->ifInDiscards = stats.rx_dropped;
counters->ifInErrors = stats.rx_errors;
counters->ifInUnknownProtos = -1;
counters->ifOutOctets = stats.tx_bytes;
counters->ifOutUcastPkts = stats.tx_packets;
counters->ifOutMulticastPkts = -1;
counters->ifOutBroadcastPkts = -1;
counters->ifOutDiscards = stats.tx_dropped;
counters->ifOutErrors = stats.tx_errors;
counters->ifPromiscuousMode = 0;
SFLADD_ELEMENT(cs, &elem);
sfl_poller_writeCountersSample(poller, cs);
}
/* Obtains an address to use for the local sFlow agent and stores it into
* '*agent_addr'. Returns true if successful, false on failure.
*
* The sFlow agent address should be a local IP address that is persistent and
* reachable over the network, if possible. The IP address associated with
* 'agent_device' is used if it has one, and otherwise 'control_ip', the IP
* address used to talk to the controller. If the agent device is not
* specified then it is figured out by taking a look at the routing table based
* on 'targets'. */
static bool
sflow_choose_agent_address(const char *agent_device,
const struct sset *targets,
const char *control_ip,
SFLAddress *agent_addr)
{
const char *target;
struct in_addr in4;
memset(agent_addr, 0, sizeof *agent_addr);
agent_addr->type = SFLADDRESSTYPE_IP_V4;
if (agent_device) {
if (!netdev_get_in4_by_name(agent_device, &in4)) {
goto success;
}
}
SSET_FOR_EACH (target, targets) {
struct sockaddr_in sin;
char name[IFNAMSIZ];
if (inet_parse_active(target, SFL_DEFAULT_COLLECTOR_PORT, &sin)
&& route_table_get_name(sin.sin_addr.s_addr, name)
&& !netdev_get_in4_by_name(name, &in4)) {
goto success;
}
}
if (control_ip && !lookup_ip(control_ip, &in4)) {
goto success;
}
VLOG_ERR("could not determine IP address for sFlow agent");
return false;
success:
agent_addr->address.ip_v4.addr = (OVS_FORCE uint32_t) in4.s_addr;
return true;
}
void
dpif_sflow_clear(struct dpif_sflow *ds)
{
if (ds->sflow_agent) {
sfl_agent_release(ds->sflow_agent);
ds->sflow_agent = NULL;
}
collectors_destroy(ds->collectors);
ds->collectors = NULL;
ofproto_sflow_options_destroy(ds->options);
ds->options = NULL;
/* Turn off sampling to save CPU cycles. */
ds->probability = 0;
}
bool
dpif_sflow_is_enabled(const struct dpif_sflow *ds)
{
return ds->collectors != NULL;
}
struct dpif_sflow *
dpif_sflow_create(struct dpif *dpif)
{
struct dpif_sflow *ds;
ds = xcalloc(1, sizeof *ds);
ds->dpif = dpif;
ds->next_tick = time_now() + 1;
hmap_init(&ds->ports);
ds->probability = 0;
route_table_register();
return ds;
}
/* 32-bit fraction of packets to sample with. A value of 0 samples no packets,
* a value of %UINT32_MAX samples all packets and intermediate values sample
* intermediate fractions of packets. */
uint32_t
dpif_sflow_get_probability(const struct dpif_sflow *ds)
{
return ds->probability;
}
void
dpif_sflow_destroy(struct dpif_sflow *ds)
{
if (ds) {
struct dpif_sflow_port *dsp, *next;
route_table_unregister();
dpif_sflow_clear(ds);
HMAP_FOR_EACH_SAFE (dsp, next, hmap_node, &ds->ports) {
dpif_sflow_del_port__(ds, dsp);
}
hmap_destroy(&ds->ports);
free(ds);
}
}
static void
dpif_sflow_add_poller(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
{
SFLPoller *poller = sfl_agent_addPoller(ds->sflow_agent, &dsp->dsi, ds,
sflow_agent_get_counters);
sfl_poller_set_sFlowCpInterval(poller, ds->options->polling_interval);
sfl_poller_set_sFlowCpReceiver(poller, RECEIVER_INDEX);
sfl_poller_set_bridgePort(poller,
ofp_port_to_odp_port(dsp->ofport->ofp_port));
}
static void
dpif_sflow_add_sampler(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
{
SFLSampler *sampler = sfl_agent_addSampler(ds->sflow_agent, &dsp->dsi);
sfl_sampler_set_sFlowFsPacketSamplingRate(sampler, ds->options->sampling_rate);
sfl_sampler_set_sFlowFsMaximumHeaderSize(sampler, ds->options->header_len);
sfl_sampler_set_sFlowFsReceiver(sampler, RECEIVER_INDEX);
}
void
dpif_sflow_add_port(struct dpif_sflow *ds, struct ofport *ofport)
{
struct dpif_sflow_port *dsp;
uint16_t odp_port = ofp_port_to_odp_port(ofport->ofp_port);
uint32_t ifindex;
dpif_sflow_del_port(ds, odp_port);
/* Add to table of ports. */
dsp = xmalloc(sizeof *dsp);
ifindex = netdev_get_ifindex(ofport->netdev);
if (ifindex <= 0) {
ifindex = (ds->sflow_agent->subId << 16) + odp_port;
}
dsp->ofport = ofport;
SFL_DS_SET(dsp->dsi, 0, ifindex, 0);
hmap_insert(&ds->ports, &dsp->hmap_node, hash_int(odp_port, 0));
/* Add poller and sampler. */
if (ds->sflow_agent) {
dpif_sflow_add_poller(ds, dsp);
dpif_sflow_add_sampler(ds, dsp);
}
}
static void
dpif_sflow_del_port__(struct dpif_sflow *ds, struct dpif_sflow_port *dsp)
{
if (ds->sflow_agent) {
sfl_agent_removePoller(ds->sflow_agent, &dsp->dsi);
sfl_agent_removeSampler(ds->sflow_agent, &dsp->dsi);
}
hmap_remove(&ds->ports, &dsp->hmap_node);
free(dsp);
}
void
dpif_sflow_del_port(struct dpif_sflow *ds, uint16_t odp_port)
{
struct dpif_sflow_port *dsp = dpif_sflow_find_port(ds, odp_port);
if (dsp) {
dpif_sflow_del_port__(ds, dsp);
}
}
void
dpif_sflow_set_options(struct dpif_sflow *ds,
const struct ofproto_sflow_options *options)
{
struct dpif_sflow_port *dsp;
bool options_changed;
SFLReceiver *receiver;
SFLAddress agentIP;
time_t now;
if (sset_is_empty(&options->targets) || !options->sampling_rate) {
/* No point in doing any work if there are no targets or nothing to
* sample. */
dpif_sflow_clear(ds);
return;
}
options_changed = (!ds->options
|| !ofproto_sflow_options_equal(options, ds->options));
/* Configure collectors if options have changed or if we're shortchanged in
* collectors (which indicates that opening one or more of the configured
* collectors failed, so that we should retry). */
if (options_changed
|| collectors_count(ds->collectors) < sset_count(&options->targets)) {
collectors_destroy(ds->collectors);
collectors_create(&options->targets, SFL_DEFAULT_COLLECTOR_PORT,
&ds->collectors);
if (ds->collectors == NULL) {
VLOG_WARN_RL(&rl, "no collectors could be initialized, "
"sFlow disabled");
dpif_sflow_clear(ds);
return;
}
}
/* Choose agent IP address and agent device (if not yet setup) */
if (!sflow_choose_agent_address(options->agent_device,
&options->targets,
options->control_ip, &agentIP)) {
dpif_sflow_clear(ds);
return;
}
/* Avoid reconfiguring if options didn't change. */
if (!options_changed) {
return;
}
ofproto_sflow_options_destroy(ds->options);
ds->options = ofproto_sflow_options_clone(options);
/* Create agent. */
VLOG_INFO("creating sFlow agent %d", options->sub_id);
if (ds->sflow_agent) {
sfl_agent_release(ds->sflow_agent);
}
ds->sflow_agent = xcalloc(1, sizeof *ds->sflow_agent);
now = time_wall();
sfl_agent_init(ds->sflow_agent,
&agentIP,
options->sub_id,
now, /* Boot time. */
now, /* Current time. */
ds, /* Pointer supplied to callbacks. */
sflow_agent_alloc_cb,
sflow_agent_free_cb,
sflow_agent_error_cb,
sflow_agent_send_packet_cb);
receiver = sfl_agent_addReceiver(ds->sflow_agent);
sfl_receiver_set_sFlowRcvrOwner(receiver, "Open vSwitch sFlow");
sfl_receiver_set_sFlowRcvrTimeout(receiver, 0xffffffff);
/* Set the sampling_rate down in the datapath. */
ds->probability = MAX(1, UINT32_MAX / ds->options->sampling_rate);
/* Add samplers and pollers for the currently known ports. */
HMAP_FOR_EACH (dsp, hmap_node, &ds->ports) {
dpif_sflow_add_poller(ds, dsp);
dpif_sflow_add_sampler(ds, dsp);
}
}
int
dpif_sflow_odp_port_to_ifindex(const struct dpif_sflow *ds,
uint16_t odp_port)
{
struct dpif_sflow_port *dsp = dpif_sflow_find_port(ds, odp_port);
return dsp ? SFL_DS_INDEX(dsp->dsi) : 0;
}
void
dpif_sflow_received(struct dpif_sflow *ds, struct ofpbuf *packet,
const struct flow *flow,
const union user_action_cookie *cookie)
{
SFL_FLOW_SAMPLE_TYPE fs;
SFLFlow_sample_element hdrElem;
SFLSampled_header *header;
SFLFlow_sample_element switchElem;
SFLSampler *sampler;
struct dpif_sflow_port *in_dsp;
struct netdev_stats stats;
ovs_be16 vlan_tci;
int error;
/* Build a flow sample */
memset(&fs, 0, sizeof fs);
in_dsp = dpif_sflow_find_port(ds, ofp_port_to_odp_port(flow->in_port));
if (!in_dsp) {
return;
}
fs.input = SFL_DS_INDEX(in_dsp->dsi);
error = ofproto_port_get_stats(in_dsp->ofport, &stats);
if (error) {
VLOG_WARN_RL(&rl, "netdev get-stats error %s", strerror(error));
return;
}
fs.sample_pool = stats.rx_packets;
/* We are going to give it to the sampler that represents this input port.
* By implementing "ingress-only" sampling like this we ensure that we
* never have to offer the same sample to more than one sampler. */
sampler = sfl_agent_getSamplerByIfIndex(ds->sflow_agent, fs.input);
if (!sampler) {
VLOG_WARN_RL(&rl, "no sampler for input ifIndex (%"PRIu32")",
fs.input);
return;
}
/* Sampled header. */
memset(&hdrElem, 0, sizeof hdrElem);
hdrElem.tag = SFLFLOW_HEADER;
header = &hdrElem.flowType.header;
header->header_protocol = SFLHEADER_ETHERNET_ISO8023;
/* The frame_length should include the Ethernet FCS (4 bytes),
but it has already been stripped, so we need to add 4 here. */
header->frame_length = packet->size + 4;
/* Ethernet FCS stripped off. */
header->stripped = 4;
header->header_length = MIN(packet->size,
sampler->sFlowFsMaximumHeaderSize);
header->header_bytes = packet->data;
/* Add extended switch element. */
memset(&switchElem, 0, sizeof(switchElem));
switchElem.tag = SFLFLOW_EX_SWITCH;
switchElem.flowType.sw.src_vlan = vlan_tci_to_vid(flow->vlan_tci);
switchElem.flowType.sw.src_priority = vlan_tci_to_pcp(flow->vlan_tci);
/* Retrieve data from user_action_cookie. */
vlan_tci = cookie->sflow.vlan_tci;
switchElem.flowType.sw.dst_vlan = vlan_tci_to_vid(vlan_tci);
switchElem.flowType.sw.dst_priority = vlan_tci_to_pcp(vlan_tci);
fs.output = cookie->sflow.output;
/* Submit the flow sample to be encoded into the next datagram. */
SFLADD_ELEMENT(&fs, &hdrElem);
SFLADD_ELEMENT(&fs, &switchElem);
sfl_sampler_writeFlowSample(sampler, &fs);
}
void
dpif_sflow_run(struct dpif_sflow *ds)
{
if (dpif_sflow_is_enabled(ds)) {
time_t now = time_now();
route_table_run();
if (now >= ds->next_tick) {
sfl_agent_tick(ds->sflow_agent, time_wall());
ds->next_tick = now + 1;
}
}
}
void
dpif_sflow_wait(struct dpif_sflow *ds)
{
if (dpif_sflow_is_enabled(ds)) {
poll_timer_wait_until(ds->next_tick * 1000LL);
}
}
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