/* net/tipc/socket.h: Include file for TIPC socket code
 *
 * Copyright (c) 2014, Ericsson AB
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _TIPC_SOCK_H
#define _TIPC_SOCK_H

#include <net/sock.h>
#include "msg.h"

#define TIPC_CONN_OK      0
#define TIPC_CONN_PROBING 1
#define TIPC_CONNACK_INTV         256
#define TIPC_FLOWCTRL_WIN        (TIPC_CONNACK_INTV * 2)
#define TIPC_CONN_OVERLOAD_LIMIT ((TIPC_FLOWCTRL_WIN * 2 + 1) * \
				  SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))

/**
 * struct tipc_port - TIPC port structure
 * @lock: pointer to spinlock for controlling access to port
 * @connected: non-zero if port is currently connected to a peer port
 * @conn_type: TIPC type used when connection was established
 * @conn_instance: TIPC instance used when connection was established
 * @published: non-zero if port has one or more associated names
 * @max_pkt: maximum packet size "hint" used when building messages sent by port
 * @ref: unique reference to port in TIPC object registry
 * @phdr: preformatted message header used when sending messages
 * @port_list: adjacent ports in TIPC's global list of ports
 * @publications: list of publications for port
 * @pub_count: total # of publications port has made during its lifetime
 * @probing_state:
 * @probing_interval:
 * @timer_ref:
 */
struct tipc_port {
	int connected;
	u32 conn_type;
	u32 conn_instance;
	int published;
	u32 max_pkt;
	u32 ref;
	struct tipc_msg phdr;
	struct list_head port_list;
	struct list_head publications;
	u32 pub_count;
	u32 probing_state;
	u32 probing_interval;
	struct timer_list timer;
};

/**
 * struct tipc_sock - TIPC socket structure
 * @sk: socket - interacts with 'port' and with user via the socket API
 * @port: port - interacts with 'sk' and with the rest of the TIPC stack
 * @peer_name: the peer of the connection, if any
 * @conn_timeout: the time we can wait for an unresponded setup request
 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
 * @link_cong: non-zero if owner must sleep because of link congestion
 * @sent_unacked: # messages sent by socket, and not yet acked by peer
 * @rcv_unacked: # messages read by user, but not yet acked back to peer
 */

struct tipc_sock {
	struct sock sk;
	struct tipc_port port;
	unsigned int conn_timeout;
	atomic_t dupl_rcvcnt;
	bool link_cong;
	uint sent_unacked;
	uint rcv_unacked;
};

static inline struct tipc_sock *tipc_sk(const struct sock *sk)
{
	return container_of(sk, struct tipc_sock, sk);
}

static inline struct tipc_sock *tipc_port_to_sock(const struct tipc_port *port)
{
	return container_of(port, struct tipc_sock, port);
}

static inline int tipc_sk_conn_cong(struct tipc_sock *tsk)
{
	return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN;
}

int tipc_sk_rcv(struct sk_buff *buf);
struct sk_buff *tipc_sk_socks_show(void);
void tipc_sk_mcast_rcv(struct sk_buff *buf);
void tipc_sk_reinit(void);

#endif