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/*
* Copyright (c) 2015-2019 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 "conntrack-private.h"
#include "conntrack-tp.h"
#include "dp-packet.h"
enum OVS_PACKED_ENUM other_state {
OTHERS_FIRST,
OTHERS_MULTIPLE,
OTHERS_BIDIR,
};
struct conn_other {
struct conn up;
enum other_state state; /* 'conn' lock protected. */
};
static const enum ct_timeout other_timeouts[] = {
[OTHERS_FIRST] = CT_TM_OTHER_FIRST,
[OTHERS_MULTIPLE] = CT_TM_OTHER_MULTIPLE,
[OTHERS_BIDIR] = CT_TM_OTHER_BIDIR,
};
static struct conn_other *
conn_other_cast(const struct conn *conn)
{
return CONTAINER_OF(conn, struct conn_other, up);
}
static enum ct_update_res
other_conn_update(struct conntrack *ct, struct conn *conn_,
struct dp_packet *pkt OVS_UNUSED, bool reply, long long now)
{
struct conn_other *conn = conn_other_cast(conn_);
if (reply && conn->state != OTHERS_BIDIR) {
conn->state = OTHERS_BIDIR;
} else if (conn->state == OTHERS_FIRST) {
conn->state = OTHERS_MULTIPLE;
}
conn_update_expiration(ct, &conn->up, other_timeouts[conn->state], now);
if (conn->state == OTHERS_BIDIR) {
return CT_UPDATE_VALID;
}
return CT_UPDATE_VALID_NEW;
}
static bool
other_valid_new(struct dp_packet *pkt OVS_UNUSED)
{
return true;
}
static struct conn *
other_new_conn(struct conntrack *ct, struct dp_packet *pkt OVS_UNUSED,
long long now, uint32_t tp_id)
{
struct conn_other *conn;
conn = xzalloc(sizeof *conn);
conn->state = OTHERS_FIRST;
conn->up.tp_id = tp_id;
conn_init_expiration(ct, &conn->up, other_timeouts[conn->state], now);
return &conn->up;
}
struct ct_l4_proto ct_proto_other = {
.new_conn = other_new_conn,
.valid_new = other_valid_new,
.conn_update = other_conn_update,
};
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