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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright Red Hat
* Author: David Gibson <david@gibson.dropbear.id.au>
*
* Tracking for logical "flows" of packets.
*/
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include "util.h"
#include "passt.h"
#include "siphash.h"
#include "inany.h"
#include "flow.h"
#include "tcp_conn.h"
#include "flow_table.h"
const char *flow_type_str[] = {
[FLOW_TYPE_NONE] = "<none>",
[FLOW_TCP] = "TCP connection",
[FLOW_TCP_SPLICE] = "TCP connection (spliced)",
};
static_assert(ARRAY_SIZE(flow_type_str) == FLOW_NUM_TYPES,
"flow_type_str[] doesn't match enum flow_type");
/* Global Flow Table */
union flow flowtab[FLOW_MAX];
/**
* flow_table_compact() - Perform compaction on flow table
* @c: Execution context
* @hole: Pointer to recently closed flow
*/
void flow_table_compact(struct ctx *c, union flow *hole)
{
union flow *from;
if (FLOW_IDX(hole) == --c->flow_count) {
debug("flow: table compaction: maximum index was %u (%p)",
FLOW_IDX(hole), (void *)hole);
memset(hole, 0, sizeof(*hole));
return;
}
from = flowtab + c->flow_count;
memcpy(hole, from, sizeof(*hole));
switch (from->f.type) {
case FLOW_TCP:
tcp_tap_conn_update(c, &from->tcp, &hole->tcp);
break;
case FLOW_TCP_SPLICE:
tcp_splice_conn_update(c, &hole->tcp_splice);
break;
default:
die("Unexpected %s in tcp_table_compact()",
FLOW_TYPE(&from->f));
}
debug("flow: table compaction (%s): old index %u, new index %u, "
"from: %p, to: %p",
FLOW_TYPE(&from->f), FLOW_IDX(from), FLOW_IDX(hole),
(void *)from, (void *)hole);
memset(from, 0, sizeof(*from));
}
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