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ofproto-dpif-ipfix.c
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/*
* Copyright (c) 2012 Nicira, Inc.
*
* 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-ipfix.h"
#include <sys/time.h>
#include "byte-order.h"
#include "collectors.h"
#include "flow.h"
#include "hash.h"
#include "hmap.h"
#include "list.h"
#include "ofpbuf.h"
#include "ofproto.h"
#include "packets.h"
#include "poll-loop.h"
#include "sset.h"
#include "util.h"
#include "timeval.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(ipfix);
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
/* Cf. IETF RFC 5101 Section 10.3.4. */
#define IPFIX_DEFAULT_COLLECTOR_PORT 4739
struct dpif_ipfix_exporter {
struct collectors *collectors;
uint32_t seq_number;
time_t last_template_set_time;
struct hmap cache_flow_key_map; /* ipfix_flow_cache_entry. */
struct list cache_flow_start_timestamp_list; /* ipfix_flow_cache_entry. */
uint32_t cache_active_timeout; /* In seconds. */
uint32_t cache_max_flows;
};
struct dpif_ipfix_bridge_exporter {
struct dpif_ipfix_exporter exporter;
struct ofproto_ipfix_bridge_exporter_options *options;
uint32_t probability;
};
struct dpif_ipfix_flow_exporter {
struct dpif_ipfix_exporter exporter;
struct ofproto_ipfix_flow_exporter_options *options;
};
struct dpif_ipfix_flow_exporter_map_node {
struct hmap_node node;
struct dpif_ipfix_flow_exporter exporter;
};
struct dpif_ipfix {
struct dpif_ipfix_bridge_exporter bridge_exporter;
struct hmap flow_exporter_map; /* dpif_ipfix_flow_exporter_map_node. */
atomic_int ref_cnt;
};
#define IPFIX_VERSION 0x000a
/* When using UDP, IPFIX Template Records must be re-sent regularly.
* The standard default interval is 10 minutes (600 seconds).
* Cf. IETF RFC 5101 Section 10.3.6. */
#define IPFIX_TEMPLATE_INTERVAL 600
/* Cf. IETF RFC 5101 Section 3.1. */
OVS_PACKED(
struct ipfix_header {
ovs_be16 version; /* IPFIX_VERSION. */
ovs_be16 length; /* Length in bytes including this header. */
ovs_be32 export_time; /* Seconds since the epoch. */
ovs_be32 seq_number; /* Message sequence number. */
ovs_be32 obs_domain_id; /* Observation Domain ID. */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_header) == 16);
#define IPFIX_SET_ID_TEMPLATE 2
#define IPFIX_SET_ID_OPTION_TEMPLATE 3
/* Cf. IETF RFC 5101 Section 3.3.2. */
OVS_PACKED(
struct ipfix_set_header {
ovs_be16 set_id; /* IPFIX_SET_ID_* or valid template ID for Data Sets. */
ovs_be16 length; /* Length of the set in bytes including header. */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_set_header) == 4);
/* Alternatives for templates at each layer. A template is defined by
* a combination of one value for each layer. */
enum ipfix_proto_l2 {
IPFIX_PROTO_L2_ETH = 0, /* No VLAN. */
IPFIX_PROTO_L2_VLAN,
NUM_IPFIX_PROTO_L2
};
enum ipfix_proto_l3 {
IPFIX_PROTO_L3_UNKNOWN = 0,
IPFIX_PROTO_L3_IPV4,
IPFIX_PROTO_L3_IPV6,
NUM_IPFIX_PROTO_L3
};
enum ipfix_proto_l4 {
IPFIX_PROTO_L4_UNKNOWN = 0,
IPFIX_PROTO_L4_TCP_UDP,
NUM_IPFIX_PROTO_L4
};
/* Any Template ID > 255 is usable for Template Records. */
#define IPFIX_TEMPLATE_ID_MIN 256
/* Cf. IETF RFC 5101 Section 3.4.1. */
OVS_PACKED(
struct ipfix_template_record_header {
ovs_be16 template_id;
ovs_be16 field_count;
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_template_record_header) == 4);
enum ipfix_entity_id {
#define IPFIX_ENTITY(ENUM, ID, SIZE, NAME) IPFIX_ENTITY_ID_##ENUM = ID,
#include "ofproto/ipfix-entities.def"
};
enum ipfix_entity_size {
#define IPFIX_ENTITY(ENUM, ID, SIZE, NAME) IPFIX_ENTITY_SIZE_##ENUM = SIZE,
#include "ofproto/ipfix-entities.def"
};
OVS_PACKED(
struct ipfix_template_field_specifier {
ovs_be16 element_id; /* IPFIX_ENTITY_ID_*. */
ovs_be16 field_length; /* Length of the field's value, in bytes. */
/* No Enterprise ID, since only standard element IDs are specified. */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_template_field_specifier) == 4);
/* Part of data record flow key for common metadata and Ethernet entities. */
OVS_PACKED(
struct ipfix_data_record_flow_key_common {
ovs_be32 observation_point_id; /* OBSERVATION_POINT_ID */
uint8_t source_mac_address[6]; /* SOURCE_MAC_ADDRESS */
uint8_t destination_mac_address[6]; /* DESTINATION_MAC_ADDRESS */
ovs_be16 ethernet_type; /* ETHERNET_TYPE */
uint8_t ethernet_header_length; /* ETHERNET_HEADER_LENGTH */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_data_record_flow_key_common) == 19);
/* Part of data record flow key for VLAN entities. */
OVS_PACKED(
struct ipfix_data_record_flow_key_vlan {
ovs_be16 vlan_id; /* VLAN_ID */
ovs_be16 dot1q_vlan_id; /* DOT1Q_VLAN_ID */
uint8_t dot1q_priority; /* DOT1Q_PRIORITY */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_data_record_flow_key_vlan) == 5);
/* Part of data record flow key for IP entities. */
/* XXX: Replace IP_TTL with MINIMUM_TTL and MAXIMUM_TTL? */
OVS_PACKED(
struct ipfix_data_record_flow_key_ip {
uint8_t ip_version; /* IP_VERSION */
uint8_t ip_ttl; /* IP_TTL */
uint8_t protocol_identifier; /* PROTOCOL_IDENTIFIER */
uint8_t ip_diff_serv_code_point; /* IP_DIFF_SERV_CODE_POINT */
uint8_t ip_precedence; /* IP_PRECEDENCE */
uint8_t ip_class_of_service; /* IP_CLASS_OF_SERVICE */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_data_record_flow_key_ip) == 6);
/* Part of data record flow key for IPv4 entities. */
OVS_PACKED(
struct ipfix_data_record_flow_key_ipv4 {
ovs_be32 source_ipv4_address; /* SOURCE_IPV4_ADDRESS */
ovs_be32 destination_ipv4_address; /* DESTINATION_IPV4_ADDRESS */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_data_record_flow_key_ipv4) == 8);
/* Part of data record flow key for IPv6 entities. */
OVS_PACKED(
struct ipfix_data_record_flow_key_ipv6 {
uint8_t source_ipv6_address[16]; /* SOURCE_IPV6_ADDRESS */
uint8_t destination_ipv6_address[16]; /* DESTINATION_IPV6_ADDRESS */
ovs_be32 flow_label_ipv6; /* FLOW_LABEL_IPV6 */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_data_record_flow_key_ipv6) == 36);
/* Part of data record flow key for TCP/UDP entities. */
OVS_PACKED(
struct ipfix_data_record_flow_key_tcpudp {
ovs_be16 source_transport_port; /* SOURCE_TRANSPORT_PORT */
ovs_be16 destination_transport_port; /* DESTINATION_TRANSPORT_PORT */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_data_record_flow_key_tcpudp) == 4);
/* Cf. IETF RFC 5102 Section 5.11.3. */
enum ipfix_flow_end_reason {
IDLE_TIMEOUT = 0x01,
ACTIVE_TIMEOUT = 0x02,
END_OF_FLOW_DETECTED = 0x03,
FORCED_END = 0x04,
LACK_OF_RESOURCES = 0x05
};
/* Part of data record for common aggregated elements. */
OVS_PACKED(
struct ipfix_data_record_aggregated_common {
ovs_be32 flow_start_delta_microseconds; /* FLOW_START_DELTA_MICROSECONDS */
ovs_be32 flow_end_delta_microseconds; /* FLOW_END_DELTA_MICROSECONDS */
ovs_be64 packet_delta_count; /* PACKET_DELTA_COUNT */
ovs_be64 layer2_octet_delta_count; /* LAYER2_OCTET_DELTA_COUNT */
uint8_t flow_end_reason; /* FLOW_END_REASON */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_data_record_aggregated_common) == 25);
/* Part of data record for IP aggregated elements. */
OVS_PACKED(
struct ipfix_data_record_aggregated_ip {
ovs_be64 octet_delta_sum_of_squares; /* OCTET_DELTA_SUM_OF_SQUARES */
ovs_be64 minimum_ip_total_length; /* MINIMUM_IP_TOTAL_LENGTH */
ovs_be64 maximum_ip_total_length; /* MAXIMUM_IP_TOTAL_LENGTH */
});
BUILD_ASSERT_DECL(sizeof(struct ipfix_data_record_aggregated_ip) == 24);
#define MAX_FLOW_KEY_LEN \
(sizeof(struct ipfix_data_record_flow_key_common) \
+ sizeof(struct ipfix_data_record_flow_key_vlan) \
+ sizeof(struct ipfix_data_record_flow_key_ip) \
+ sizeof(struct ipfix_data_record_flow_key_ipv6) \
+ sizeof(struct ipfix_data_record_flow_key_tcpudp))
#define MAX_DATA_RECORD_LEN \
(MAX_FLOW_KEY_LEN \
+ sizeof(struct ipfix_data_record_aggregated_common) \
+ sizeof(struct ipfix_data_record_aggregated_ip))
/* Max length of a data set. To simplify the implementation, each
* data record is sent in a separate data set, so each data set
* contains at most one data record. */
#define MAX_DATA_SET_LEN \
(sizeof(struct ipfix_set_header) \
+ MAX_DATA_RECORD_LEN)
/* Max length of an IPFIX message. Arbitrarily set to accomodate low
* MTU. */
#define MAX_MESSAGE_LEN 1024
/* Cache structures. */
/* Flow key. */
struct ipfix_flow_key {
uint32_t obs_domain_id;
uint16_t template_id;
size_t flow_key_msg_part_size;
uint64_t flow_key_msg_part[DIV_ROUND_UP(MAX_FLOW_KEY_LEN, 8)];
};
/* Flow cache entry. */
struct ipfix_flow_cache_entry {
struct hmap_node flow_key_map_node;
struct list cache_flow_start_timestamp_list_node;
struct ipfix_flow_key flow_key;
/* Common aggregated elements. */
uint64_t flow_start_timestamp_usec;
uint64_t flow_end_timestamp_usec;
uint64_t packet_delta_count;
uint64_t layer2_octet_delta_count;
uint64_t octet_delta_sum_of_squares; /* 0 if not IP. */
uint16_t minimum_ip_total_length; /* 0 if not IP. */
uint16_t maximum_ip_total_length; /* 0 if not IP. */
};
static void dpif_ipfix_cache_expire(struct dpif_ipfix_exporter *, bool,
const uint64_t, const uint32_t);
static void get_export_time_now(uint64_t *, uint32_t *);
static void dpif_ipfix_cache_expire_now(struct dpif_ipfix_exporter *, bool);
static bool
ofproto_ipfix_bridge_exporter_options_equal(
const struct ofproto_ipfix_bridge_exporter_options *a,
const struct ofproto_ipfix_bridge_exporter_options *b)
{
return (a->obs_domain_id == b->obs_domain_id
&& a->obs_point_id == b->obs_point_id
&& a->sampling_rate == b->sampling_rate
&& a->cache_active_timeout == b->cache_active_timeout
&& a->cache_max_flows == b->cache_max_flows
&& sset_equals(&a->targets, &b->targets));
}
static struct ofproto_ipfix_bridge_exporter_options *
ofproto_ipfix_bridge_exporter_options_clone(
const struct ofproto_ipfix_bridge_exporter_options *old)
{
struct ofproto_ipfix_bridge_exporter_options *new =
xmemdup(old, sizeof *old);
sset_clone(&new->targets, &old->targets);
return new;
}
static void
ofproto_ipfix_bridge_exporter_options_destroy(
struct ofproto_ipfix_bridge_exporter_options *options)
{
if (options) {
sset_destroy(&options->targets);
free(options);
}
}
static bool
ofproto_ipfix_flow_exporter_options_equal(
const struct ofproto_ipfix_flow_exporter_options *a,
const struct ofproto_ipfix_flow_exporter_options *b)
{
return (a->collector_set_id == b->collector_set_id
&& a->cache_active_timeout == b->cache_active_timeout
&& a->cache_max_flows == b->cache_max_flows
&& sset_equals(&a->targets, &b->targets));
}
static struct ofproto_ipfix_flow_exporter_options *
ofproto_ipfix_flow_exporter_options_clone(
const struct ofproto_ipfix_flow_exporter_options *old)
{
struct ofproto_ipfix_flow_exporter_options *new =
xmemdup(old, sizeof *old);
sset_clone(&new->targets, &old->targets);
return new;
}
static void
ofproto_ipfix_flow_exporter_options_destroy(
struct ofproto_ipfix_flow_exporter_options *options)
{
if (options) {
sset_destroy(&options->targets);
free(options);
}
}
static void
dpif_ipfix_exporter_init(struct dpif_ipfix_exporter *exporter)
{
exporter->collectors = NULL;
exporter->seq_number = 1;
exporter->last_template_set_time = TIME_MIN;
hmap_init(&exporter->cache_flow_key_map);
list_init(&exporter->cache_flow_start_timestamp_list);
exporter->cache_active_timeout = 0;
exporter->cache_max_flows = 0;
}
static void
dpif_ipfix_exporter_clear(struct dpif_ipfix_exporter *exporter)
{
/* Flush the cache with flow end reason "forced end." */
dpif_ipfix_cache_expire_now(exporter, true);
collectors_destroy(exporter->collectors);
exporter->collectors = NULL;
exporter->seq_number = 1;
exporter->last_template_set_time = TIME_MIN;
exporter->cache_active_timeout = 0;
exporter->cache_max_flows = 0;
}
static void
dpif_ipfix_exporter_destroy(struct dpif_ipfix_exporter *exporter)
{
dpif_ipfix_exporter_clear(exporter);
hmap_destroy(&exporter->cache_flow_key_map);
}
static bool
dpif_ipfix_exporter_set_options(struct dpif_ipfix_exporter *exporter,
const struct sset *targets,
const uint32_t cache_active_timeout,
const uint32_t cache_max_flows)
{
collectors_destroy(exporter->collectors);
collectors_create(targets, IPFIX_DEFAULT_COLLECTOR_PORT,
&exporter->collectors);
if (exporter->collectors == NULL) {
VLOG_WARN_RL(&rl, "no collectors could be initialized, "
"IPFIX exporter disabled");
dpif_ipfix_exporter_clear(exporter);
return false;
}
exporter->cache_active_timeout = cache_active_timeout;
exporter->cache_max_flows = cache_max_flows;
return true;
}
static void
dpif_ipfix_bridge_exporter_init(struct dpif_ipfix_bridge_exporter *exporter)
{
dpif_ipfix_exporter_init(&exporter->exporter);
exporter->options = NULL;
exporter->probability = 0;
}
static void
dpif_ipfix_bridge_exporter_clear(struct dpif_ipfix_bridge_exporter *exporter)
{
dpif_ipfix_exporter_clear(&exporter->exporter);
ofproto_ipfix_bridge_exporter_options_destroy(exporter->options);
exporter->options = NULL;
exporter->probability = 0;
}
static void
dpif_ipfix_bridge_exporter_destroy(struct dpif_ipfix_bridge_exporter *exporter)
{
dpif_ipfix_bridge_exporter_clear(exporter);
dpif_ipfix_exporter_destroy(&exporter->exporter);
}
static void
dpif_ipfix_bridge_exporter_set_options(
struct dpif_ipfix_bridge_exporter *exporter,
const struct ofproto_ipfix_bridge_exporter_options *options)
{
bool options_changed;
if (!options || sset_is_empty(&options->targets)) {
/* No point in doing any work if there are no targets. */
dpif_ipfix_bridge_exporter_clear(exporter);
return;
}
options_changed = (
!exporter->options
|| !ofproto_ipfix_bridge_exporter_options_equal(
options, exporter->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(exporter->exporter.collectors)
< sset_count(&options->targets)) {
if (!dpif_ipfix_exporter_set_options(
&exporter->exporter, &options->targets,
options->cache_active_timeout, options->cache_max_flows)) {
return;
}
}
/* Avoid reconfiguring if options didn't change. */
if (!options_changed) {
return;
}
ofproto_ipfix_bridge_exporter_options_destroy(exporter->options);
exporter->options = ofproto_ipfix_bridge_exporter_options_clone(options);
exporter->probability =
MAX(1, UINT32_MAX / exporter->options->sampling_rate);
/* Run over the cache as some entries might have expired after
* changing the timeouts. */
dpif_ipfix_cache_expire_now(&exporter->exporter, false);
}
static struct dpif_ipfix_flow_exporter_map_node*
dpif_ipfix_find_flow_exporter_map_node(
const struct dpif_ipfix *di, const uint32_t collector_set_id)
OVS_REQUIRES(mutex)
{
struct dpif_ipfix_flow_exporter_map_node *exporter_node;
HMAP_FOR_EACH_WITH_HASH (exporter_node, node,
hash_int(collector_set_id, 0),
&di->flow_exporter_map) {
if (exporter_node->exporter.options->collector_set_id
== collector_set_id) {
return exporter_node;
}
}
return NULL;
}
static void
dpif_ipfix_flow_exporter_init(struct dpif_ipfix_flow_exporter *exporter)
{
dpif_ipfix_exporter_init(&exporter->exporter);
exporter->options = NULL;
}
static void
dpif_ipfix_flow_exporter_clear(struct dpif_ipfix_flow_exporter *exporter)
{
dpif_ipfix_exporter_clear(&exporter->exporter);
ofproto_ipfix_flow_exporter_options_destroy(exporter->options);
exporter->options = NULL;
}
static void
dpif_ipfix_flow_exporter_destroy(struct dpif_ipfix_flow_exporter *exporter)
{
dpif_ipfix_flow_exporter_clear(exporter);
dpif_ipfix_exporter_destroy(&exporter->exporter);
}
static bool
dpif_ipfix_flow_exporter_set_options(
struct dpif_ipfix_flow_exporter *exporter,
const struct ofproto_ipfix_flow_exporter_options *options)
{
bool options_changed;
if (sset_is_empty(&options->targets)) {
/* No point in doing any work if there are no targets. */
dpif_ipfix_flow_exporter_clear(exporter);
return true;
}
options_changed = (
!exporter->options
|| !ofproto_ipfix_flow_exporter_options_equal(
options, exporter->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(exporter->exporter.collectors)
< sset_count(&options->targets)) {
if (!dpif_ipfix_exporter_set_options(
&exporter->exporter, &options->targets,
options->cache_active_timeout, options->cache_max_flows)) {
return false;
}
}
/* Avoid reconfiguring if options didn't change. */
if (!options_changed) {
return true;
}
ofproto_ipfix_flow_exporter_options_destroy(exporter->options);
exporter->options = ofproto_ipfix_flow_exporter_options_clone(options);
/* Run over the cache as some entries might have expired after
* changing the timeouts. */
dpif_ipfix_cache_expire_now(&exporter->exporter, false);
return true;
}
void
dpif_ipfix_set_options(
struct dpif_ipfix *di,
const struct ofproto_ipfix_bridge_exporter_options *bridge_exporter_options,
const struct ofproto_ipfix_flow_exporter_options *flow_exporters_options,
size_t n_flow_exporters_options) OVS_EXCLUDED(mutex)
{
int i;
struct ofproto_ipfix_flow_exporter_options *options;
struct dpif_ipfix_flow_exporter_map_node *node, *next;
size_t n_broken_flow_exporters_options = 0;
ovs_mutex_lock(&mutex);
dpif_ipfix_bridge_exporter_set_options(&di->bridge_exporter,
bridge_exporter_options);
/* Add new flow exporters and update current flow exporters. */
options = (struct ofproto_ipfix_flow_exporter_options *)
flow_exporters_options;
for (i = 0; i < n_flow_exporters_options; i++) {
node = dpif_ipfix_find_flow_exporter_map_node(
di, options->collector_set_id);
if (!node) {
node = xzalloc(sizeof *node);
dpif_ipfix_flow_exporter_init(&node->exporter);
hmap_insert(&di->flow_exporter_map, &node->node,
hash_int(options->collector_set_id, 0));
}
if (!dpif_ipfix_flow_exporter_set_options(&node->exporter, options)) {
n_broken_flow_exporters_options++;
}
options++;
}
ovs_assert(hmap_count(&di->flow_exporter_map) >=
(n_flow_exporters_options - n_broken_flow_exporters_options));
/* Remove dropped flow exporters, if any needs to be removed. */
if (hmap_count(&di->flow_exporter_map) > n_flow_exporters_options) {
HMAP_FOR_EACH_SAFE (node, next, node, &di->flow_exporter_map) {
/* This is slow but doesn't take any extra memory, and
* this table is not supposed to contain many rows anyway. */
options = (struct ofproto_ipfix_flow_exporter_options *)
flow_exporters_options;
for (i = 0; i < n_flow_exporters_options; i++) {
if (node->exporter.options->collector_set_id
== options->collector_set_id) {
break;
}
options++;
}
if (i == n_flow_exporters_options) { // Not found.
hmap_remove(&di->flow_exporter_map, &node->node);
dpif_ipfix_flow_exporter_destroy(&node->exporter);
free(node);
}
}
}
ovs_assert(hmap_count(&di->flow_exporter_map) ==
(n_flow_exporters_options - n_broken_flow_exporters_options));
ovs_mutex_unlock(&mutex);
}
struct dpif_ipfix *
dpif_ipfix_create(void)
{
struct dpif_ipfix *di;
di = xzalloc(sizeof *di);
dpif_ipfix_bridge_exporter_init(&di->bridge_exporter);
hmap_init(&di->flow_exporter_map);
atomic_init(&di->ref_cnt, 1);
return di;
}
struct dpif_ipfix *
dpif_ipfix_ref(const struct dpif_ipfix *di_)
{
struct dpif_ipfix *di = CONST_CAST(struct dpif_ipfix *, di_);
if (di) {
int orig;
atomic_add(&di->ref_cnt, 1, &orig);
ovs_assert(orig > 0);
}
return di;
}
uint32_t
dpif_ipfix_get_bridge_exporter_probability(const struct dpif_ipfix *di)
OVS_EXCLUDED(mutex)
{
uint32_t ret;
ovs_mutex_lock(&mutex);
ret = di->bridge_exporter.probability;
ovs_mutex_unlock(&mutex);
return ret;
}
static void
dpif_ipfix_clear(struct dpif_ipfix *di) OVS_REQUIRES(mutex)
{
struct dpif_ipfix_flow_exporter_map_node *exp_node, *exp_next;
dpif_ipfix_bridge_exporter_clear(&di->bridge_exporter);
HMAP_FOR_EACH_SAFE (exp_node, exp_next, node, &di->flow_exporter_map) {
hmap_remove(&di->flow_exporter_map, &exp_node->node);
dpif_ipfix_flow_exporter_destroy(&exp_node->exporter);
free(exp_node);
}
}
void
dpif_ipfix_unref(struct dpif_ipfix *di) OVS_EXCLUDED(mutex)
{
int orig;
if (!di) {
return;
}
atomic_sub(&di->ref_cnt, 1, &orig);
ovs_assert(orig > 0);
if (orig == 1) {
ovs_mutex_lock(&mutex);
dpif_ipfix_clear(di);
dpif_ipfix_bridge_exporter_destroy(&di->bridge_exporter);
hmap_destroy(&di->flow_exporter_map);
free(di);
ovs_mutex_unlock(&mutex);
}
}
static void
ipfix_init_header(uint32_t export_time_sec, uint32_t seq_number,
uint32_t obs_domain_id, struct ofpbuf *msg)
{
struct ipfix_header *hdr;
hdr = ofpbuf_put_zeros(msg, sizeof *hdr);
hdr->version = htons(IPFIX_VERSION);
hdr->length = htons(sizeof *hdr); /* Updated in ipfix_send_msg. */
hdr->export_time = htonl(export_time_sec);
hdr->seq_number = htonl(seq_number);
hdr->obs_domain_id = htonl(obs_domain_id);
}
static void
ipfix_send_msg(const struct collectors *collectors, struct ofpbuf *msg)
{
struct ipfix_header *hdr;
/* Adjust the length in the header. */
hdr = msg->data;
hdr->length = htons(msg->size);
collectors_send(collectors, msg->data, msg->size);
msg->size = 0;
}
static uint16_t
ipfix_get_template_id(enum ipfix_proto_l2 l2, enum ipfix_proto_l3 l3,
enum ipfix_proto_l4 l4)
{
uint16_t template_id;
template_id = l2;
template_id = template_id * NUM_IPFIX_PROTO_L3 + l3;
template_id = template_id * NUM_IPFIX_PROTO_L4 + l4;
return IPFIX_TEMPLATE_ID_MIN + template_id;
}
static void
ipfix_define_template_entity(enum ipfix_entity_id id,
enum ipfix_entity_size size, struct ofpbuf *msg)
{
struct ipfix_template_field_specifier *field;
field = ofpbuf_put_zeros(msg, sizeof *field);
field->element_id = htons(id);
field->field_length = htons(size);
}
static uint16_t
ipfix_define_template_fields(enum ipfix_proto_l2 l2, enum ipfix_proto_l3 l3,
enum ipfix_proto_l4 l4, struct ofpbuf *msg)
{
uint16_t count = 0;
#define DEF(ID) \
{ \
ipfix_define_template_entity(IPFIX_ENTITY_ID_##ID, \
IPFIX_ENTITY_SIZE_##ID, msg); \
count++; \
}
/* 1. Flow key. */
DEF(OBSERVATION_POINT_ID);
/* Common Ethernet entities. */
DEF(SOURCE_MAC_ADDRESS);
DEF(DESTINATION_MAC_ADDRESS);
DEF(ETHERNET_TYPE);
DEF(ETHERNET_HEADER_LENGTH);
if (l2 == IPFIX_PROTO_L2_VLAN) {
DEF(VLAN_ID);
DEF(DOT1Q_VLAN_ID);
DEF(DOT1Q_PRIORITY);
}
if (l3 != IPFIX_PROTO_L3_UNKNOWN) {
DEF(IP_VERSION);
DEF(IP_TTL);
DEF(PROTOCOL_IDENTIFIER);
DEF(IP_DIFF_SERV_CODE_POINT);
DEF(IP_PRECEDENCE);
DEF(IP_CLASS_OF_SERVICE);
if (l3 == IPFIX_PROTO_L3_IPV4) {
DEF(SOURCE_IPV4_ADDRESS);
DEF(DESTINATION_IPV4_ADDRESS);
} else { /* l3 == IPFIX_PROTO_L3_IPV6 */
DEF(SOURCE_IPV6_ADDRESS);
DEF(DESTINATION_IPV6_ADDRESS);
DEF(FLOW_LABEL_IPV6);
}
}
if (l4 != IPFIX_PROTO_L4_UNKNOWN) {
DEF(SOURCE_TRANSPORT_PORT);
DEF(DESTINATION_TRANSPORT_PORT);
}
/* 2. Flow aggregated data. */
DEF(FLOW_START_DELTA_MICROSECONDS);
DEF(FLOW_END_DELTA_MICROSECONDS);
DEF(PACKET_DELTA_COUNT);
DEF(LAYER2_OCTET_DELTA_COUNT);
DEF(FLOW_END_REASON);
if (l3 != IPFIX_PROTO_L3_UNKNOWN) {
DEF(OCTET_DELTA_SUM_OF_SQUARES);
DEF(MINIMUM_IP_TOTAL_LENGTH);
DEF(MAXIMUM_IP_TOTAL_LENGTH);
}
#undef DEF
return count;
}
static void
ipfix_send_template_msg(struct dpif_ipfix_exporter *exporter,
uint32_t export_time_sec, uint32_t obs_domain_id)
{
uint64_t msg_stub[DIV_ROUND_UP(MAX_MESSAGE_LEN, 8)];
struct ofpbuf msg;
size_t set_hdr_offset, tmpl_hdr_offset;
struct ipfix_set_header *set_hdr;
struct ipfix_template_record_header *tmpl_hdr;
uint16_t field_count;
enum ipfix_proto_l2 l2;
enum ipfix_proto_l3 l3;
enum ipfix_proto_l4 l4;
ofpbuf_use_stub(&msg, msg_stub, sizeof msg_stub);
ipfix_init_header(export_time_sec, exporter->seq_number, obs_domain_id,
&msg);
set_hdr_offset = msg.size;
/* Add a Template Set. */
set_hdr = ofpbuf_put_zeros(&msg, sizeof *set_hdr);
set_hdr->set_id = htons(IPFIX_SET_ID_TEMPLATE);
/* Define one template for each possible combination of
* protocols. */
for (l2 = 0; l2 < NUM_IPFIX_PROTO_L2; l2++) {
for (l3 = 0; l3 < NUM_IPFIX_PROTO_L3; l3++) {
for (l4 = 0; l4 < NUM_IPFIX_PROTO_L4; l4++) {
if (l3 == IPFIX_PROTO_L3_UNKNOWN &&
l4 != IPFIX_PROTO_L4_UNKNOWN) {
continue;
}
tmpl_hdr_offset = msg.size;
tmpl_hdr = ofpbuf_put_zeros(&msg, sizeof *tmpl_hdr);
tmpl_hdr->template_id = htons(
ipfix_get_template_id(l2, l3, l4));
field_count = ipfix_define_template_fields(l2, l3, l4, &msg);
tmpl_hdr = (struct ipfix_template_record_header*)
((uint8_t*)msg.data + tmpl_hdr_offset);
tmpl_hdr->field_count = htons(field_count);
}
}
}
set_hdr = (struct ipfix_set_header*)((uint8_t*)msg.data + set_hdr_offset);
set_hdr->length = htons(msg.size - set_hdr_offset);
/* XXX: Add Options Template Sets, at least to define a Flow Keys
* Option Template. */
ipfix_send_msg(exporter->collectors, &msg);
ofpbuf_uninit(&msg);
}
static inline uint32_t
ipfix_hash_flow_key(const struct ipfix_flow_key *flow_key, uint32_t basis)
{
uint32_t hash;
hash = hash_int(flow_key->obs_domain_id, basis);
hash = hash_int(flow_key->template_id, hash);
hash = hash_bytes(flow_key->flow_key_msg_part,
flow_key->flow_key_msg_part_size, hash);
return hash;
}
static bool
ipfix_flow_key_equal(const struct ipfix_flow_key *a,
const struct ipfix_flow_key *b)
{
/* The template ID determines the flow key size, so not need to
* compare it. */
return (a->obs_domain_id == b->obs_domain_id
&& a->template_id == b->template_id
&& memcmp(a->flow_key_msg_part, b->flow_key_msg_part,
a->flow_key_msg_part_size) == 0);
}
static struct ipfix_flow_cache_entry*
ipfix_cache_find_entry(const struct dpif_ipfix_exporter *exporter,
const struct ipfix_flow_key *flow_key)
{
struct ipfix_flow_cache_entry *entry;
HMAP_FOR_EACH_WITH_HASH (entry, flow_key_map_node,
ipfix_hash_flow_key(flow_key, 0),
&exporter->cache_flow_key_map) {
if (ipfix_flow_key_equal(&entry->flow_key, flow_key)) {
return entry;
}
}
return NULL;
}
static bool
ipfix_cache_next_timeout_msec(const struct dpif_ipfix_exporter *exporter,
long long int *next_timeout_msec)
{
struct ipfix_flow_cache_entry *entry;
LIST_FOR_EACH (entry, cache_flow_start_timestamp_list_node,
&exporter->cache_flow_start_timestamp_list) {
*next_timeout_msec = entry->flow_start_timestamp_usec / 1000LL
+ 1000LL * exporter->cache_active_timeout;
return true;
}
return false;
}
static void
ipfix_cache_aggregate_entries(struct ipfix_flow_cache_entry *from_entry,
struct ipfix_flow_cache_entry *to_entry)
{
uint64_t *to_start, *to_end, *from_start, *from_end;
uint16_t *to_min_len, *to_max_len, *from_min_len, *from_max_len;
to_start = &to_entry->flow_start_timestamp_usec;
to_end = &to_entry->flow_end_timestamp_usec;
from_start = &from_entry->flow_start_timestamp_usec;
from_end = &from_entry->flow_end_timestamp_usec;
if (*to_start > *from_start) {
*to_start = *from_start;
}
if (*to_end < *from_end) {
*to_end = *from_end;
}
to_entry->packet_delta_count += from_entry->packet_delta_count;
to_entry->layer2_octet_delta_count += from_entry->layer2_octet_delta_count;
to_entry->octet_delta_sum_of_squares +=
from_entry->octet_delta_sum_of_squares;
to_min_len = &to_entry->minimum_ip_total_length;
to_max_len = &to_entry->maximum_ip_total_length;
from_min_len = &from_entry->minimum_ip_total_length;
from_max_len = &from_entry->maximum_ip_total_length;
if (!*to_min_len || (*from_min_len && *to_min_len > *from_min_len)) {
*to_min_len = *from_min_len;
}
if (*to_max_len < *from_max_len) {
*to_max_len = *from_max_len;
}
}
/* Add an entry into a flow cache. The entry is either aggregated into
* an existing entry with the same flow key and free()d, or it is
* inserted into the cache. */
static void
ipfix_cache_update(struct dpif_ipfix_exporter *exporter,
struct ipfix_flow_cache_entry *entry)
{
struct ipfix_flow_cache_entry *old_entry;
old_entry = ipfix_cache_find_entry(exporter, &entry->flow_key);
if (old_entry == NULL) {
hmap_insert(&exporter->cache_flow_key_map, &entry->flow_key_map_node,
ipfix_hash_flow_key(&entry->flow_key, 0));
/* As the latest entry added into the cache, it should
* logically have the highest flow_start_timestamp_usec, so
* append it at the tail. */
list_push_back(&exporter->cache_flow_start_timestamp_list,
&entry->cache_flow_start_timestamp_list_node);
/* Enforce exporter->cache_max_flows limit. */
if (hmap_count(&exporter->cache_flow_key_map)
> exporter->cache_max_flows) {
dpif_ipfix_cache_expire_now(exporter, false);
}
} else {