--- /dev/null
+/* See the DRL-LICENSE file for this file's software license. */
+
+#include <arpa/inet.h>
+#include <assert.h>
+#include <inttypes.h>
+#include <netinet/in.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include "common_accounting.h"
+#include "standard.h"
+#include "logging.h"
+
+standard_flow_table standard_table_create(uint32_t (*hash_function)(const key_flow *key), common_accounting_t *common) {
+ standard_flow_table table = malloc(sizeof(struct std_flow_table));
+
+ if (table == NULL) {
+ return NULL;
+ }
+
+ memset(table, 0, sizeof(struct std_flow_table));
+ table->common = common;
+ table->hash_function = hash_function;
+
+ gettimeofday(&table->common->last_update, NULL);
+
+ return table;
+}
+
+void standard_table_destroy(standard_flow_table table) {
+ standard_flow *current, *next;
+
+ if ((current = table->flows_head)) {
+ while (current->next) {
+ next = current->next;
+ free(current);
+ current = next;
+ }
+ free(current);
+ }
+
+ free(table);
+}
+
+/* Looks for the flow in the table. If the flow isn't there, it allocates a
+ * place for it. */
+standard_flow *standard_table_lookup(standard_flow_table table, const key_flow *key) {
+ uint32_t hash;
+ standard_flow *flow;
+ struct in_addr src, dst;
+ char sip[22], dip[22];
+
+ if (table == NULL) {
+ return NULL;
+ }
+
+ hash = table->hash_function(key);
+
+ /* Find the flow, if it's there. */
+ for (flow = table->flows[hash]; flow; flow = flow->nexth) {
+ if (flow->source_ip == key->source_ip &&
+ flow->dest_ip == key->dest_ip &&
+ flow->source_port == key->source_port &&
+ flow->dest_port == key->dest_port &&
+ flow->protocol == key->protocol) {
+ break;
+ }
+ }
+
+ if (flow == NULL) {
+ flow = malloc(sizeof(standard_flow));
+ if (flow == NULL) {
+ printf("Malloc returned null.\n");
+ printlog(LOG_CRITICAL, "ALLOC: Malloc returned NULL.\n");
+ return NULL;
+ }
+
+ memset(flow, 0, sizeof(standard_flow));
+ flow->protocol = key->protocol;
+ flow->source_ip = key->source_ip;
+ flow->dest_ip = key->dest_ip;
+ flow->source_port = key->source_port;
+ flow->dest_port = key->dest_port;
+ flow->last_packet = key->packet_time;
+ gettimeofday(&flow->last_update, NULL);
+
+ /* Add the flow to the hash list. */
+ flow->nexth = table->flows[hash];
+ table->flows[hash] = flow;
+
+ /* Add the flow to the linked list. */
+ if (table->flows_tail) {
+ flow->prev = table->flows_tail;
+ table->flows_tail->next = flow;
+ table->flows_tail = flow;
+ } else {
+ table->flows_head = table->flows_tail = flow;
+ /* next and prev are already null due to memset above. */
+ }
+
+ src.s_addr = ntohl(flow->source_ip);
+ dst.s_addr = ntohl(flow->dest_ip);
+ strcpy(sip, inet_ntoa(src));
+ strcpy(dip, inet_ntoa(dst));
+ printlog(LOG_DEBUG, "ALLOC:%s:%hd -> %s:%hd\n", sip,
+ flow->source_port, dip, flow->dest_port);
+ }
+
+ return flow;
+}
+
+int standard_table_sample(standard_flow_table table, const key_flow *key) {
+ standard_flow *flow;
+
+ assert(table != NULL);
+ assert(table->common != NULL);
+
+ /* Update aggregate. */
+ table->common->bytes_since += key->packet_size;
+
+ /* Update flow. */
+ flow = standard_table_lookup(table, key);
+ if (flow == NULL) {
+ return 0;
+ }
+
+ flow->bytes_since += key->packet_size;
+ flow->last_packet = key->packet_time;
+
+ return 1;
+}
+
+void standard_table_remove(standard_flow_table table, standard_flow *flow) {
+ key_flow key;
+ uint32_t hash;
+ standard_flow *current, *prev;
+
+ assert(flow);
+
+ /* Remove the flow from the hash list. */
+ key.source_ip = flow->source_ip;
+ key.dest_ip = flow->dest_ip;
+ key.source_port = flow->source_port;
+ key.dest_port = flow->dest_port;
+ key.protocol = flow->protocol;
+
+ hash = table->hash_function(&key);
+
+ assert(table->flows[hash]);
+
+ if (table->flows[hash] == flow) {
+ /* It's the head of the hash list. */
+ table->flows[hash] = flow->nexth;
+ } else {
+ prev = table->flows[hash];
+ current = table->flows[hash]->nexth;
+
+ while (current != NULL) {
+ if (current == flow) {
+ prev->nexth = flow->nexth;
+ break;
+ } else {
+ prev = current;
+ current = current->next;
+ }
+ }
+
+ assert(current != NULL);
+ }
+
+ /* Remove the flow from the linked list. */
+ if (flow->prev == NULL && flow->next == NULL) {
+ /* It's the head, tail, and only element of the list. */
+ assert(table->flows_head == flow);
+ assert(table->flows_tail == flow);
+
+ table->flows_head = NULL;
+ table->flows_tail = NULL;
+ } else if (flow->prev == NULL) {
+ /* It's the head of the list. */
+ assert(table->flows_head == flow);
+
+ table->flows_head = flow->next;
+
+ if (table->flows_head != NULL) {
+ table->flows_head->prev = NULL;
+ }
+ } else if (flow->next == NULL) {
+ /* It's the tail of the list. */
+ assert(table->flows_tail == flow);
+
+ table->flows_tail = flow->prev;
+
+ table->flows_tail->next = NULL;
+ } else {
+ /* Not the head or tail of the list. */
+ assert(table->flows_head != flow);
+
+ flow->prev->next = flow->next;
+
+ if (flow->next != NULL) {
+ flow->next->prev = flow->prev;
+ }
+ }
+
+ memset(flow, 0, sizeof(standard_flow));
+
+ /* Free the flow. */
+ free(flow);
+}
+
+int standard_table_cleanup(standard_flow_table table) {
+ standard_flow *current = table->flows_head;
+ standard_flow *remove;
+ time_t now = time(NULL);
+
+ while (current != NULL) {
+ if (current->last_packet + FLOW_IDLE_TIME <= now) {
+ /* Flow hasn't received a packet in the time limit - kill it. */
+ remove = current;
+ current = current->next;
+
+ standard_table_remove(table, remove);
+ } else {
+ current = current->next;
+ }
+ }
+
+ return 0;
+}
+
+void standard_table_update_flows(standard_flow_table table, struct timeval now, double ewma_weight) {
+ uint32_t maxflowrate = 0;
+ double time_delta;
+ double unweighted_rate;
+ standard_flow *current;
+ struct in_addr src, dst;
+ char sip[22], dip[22];
+
+ time_delta = timeval_subtract(now, table->common->last_update);
+
+ if (time_delta <= 0) {
+ unweighted_rate = 0;
+ } else {
+ unweighted_rate = table->common->bytes_since / time_delta;
+ }
+
+ table->common->last_inst_rate = table->common->inst_rate;
+ table->common->inst_rate = unweighted_rate;
+
+ table->common->last_rate = table->common->rate;
+
+ /* If the rate is zero, then we don't know anything yet. Don't apply EWMA
+ * in that case. */
+ if (table->common->rate == 0) {
+ table->common->rate = unweighted_rate;
+ } else {
+ table->common->rate = table->common->rate * ewma_weight +
+ unweighted_rate * (1 - ewma_weight);
+ }
+
+ table->common->bytes_since = 0;
+ table->common->last_update = now;
+
+ //printf("Flows: ");
+
+ /* Update per-flow information. */
+ for (current = table->flows_head; current; current = current->next) {
+ time_delta = timeval_subtract(now, current->last_update);
+
+ if (time_delta <= 0) {
+ unweighted_rate = 0;
+ } else {
+ unweighted_rate = current->bytes_since / time_delta;
+ }
+
+ current->last_rate = current->rate;
+
+ if (current->rate == 0) {
+ current->rate = unweighted_rate;
+ } else {
+ current->rate = current->rate * ewma_weight +
+ unweighted_rate * (1 - ewma_weight);
+ }
+
+ current->bytes_since = 0;
+ current->last_update = now;
+
+ if (current->rate > maxflowrate) {
+ maxflowrate = current->rate;
+ }
+
+ //printf("%d, ", current->rate);
+
+ src.s_addr = ntohl(current->source_ip);
+ dst.s_addr = ntohl(current->dest_ip);
+ strcpy(sip, inet_ntoa(src));
+ strcpy(dip, inet_ntoa(dst));
+ printlog(LOG_DEBUG, "FLOW: (%p) %s:%d -> %s:%d at %d\n", current,
+ sip, current->source_port,
+ dip, current->dest_port,
+ current->rate);
+ }
+
+ //printf("\n");
+ printlog(LOG_DEBUG, "FLOW:--\n--\n");
+
+ table->common->max_flow_rate = maxflowrate;
+}
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