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/*
* net/tipc/port.h: Include file for TIPC port code
*
* Copyright (c) 1994-2007, Ericsson AB
* Copyright (c) 2004-2007, Wind River Systems
* 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_PORT_H
#define _TIPC_PORT_H
#include "core.h"
#include "ref.h"
#include "net.h"
#include "msg.h"
#include "dbg.h"
#include "node_subscr.h"
/**
* struct user_port - TIPC user port (used with native API)
* @user_ref: id of user who created user port
* @usr_handle: user-specified field
* @ref: object reference to associated TIPC port
* <various callback routines>
* @uport_list: adjacent user ports in list of ports held by user
*/
struct user_port {
u32 user_ref;
void *usr_handle;
u32 ref;
tipc_msg_err_event err_cb;
tipc_named_msg_err_event named_err_cb;
tipc_conn_shutdown_event conn_err_cb;
tipc_msg_event msg_cb;
tipc_named_msg_event named_msg_cb;
tipc_conn_msg_event conn_msg_cb;
tipc_continue_event continue_event_cb;
struct list_head uport_list;
};
/**
* struct port - TIPC port structure
* @publ: TIPC port info available to privileged users
* @port_list: adjacent ports in TIPC's global list of ports
* @dispatcher: ptr to routine which handles received messages
* @wakeup: ptr to routine to call when port is no longer congested
* @user_port: ptr to user port associated with port (if any)
* @wait_list: adjacent ports in list of ports waiting on link congestion
* @waiting_pkts:
* @sent:
* @acked:
* @publications: list of publications for port
* @pub_count: total # of publications port has made during its lifetime
* @probing_state:
* @probing_interval:
* @last_in_seqno:
* @timer_ref:
* @subscription: "node down" subscription used to terminate failed connections
*/
struct port {
struct tipc_port publ;
struct list_head port_list;
u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
void (*wakeup)(struct tipc_port *);
struct user_port *user_port;
struct list_head wait_list;
u32 waiting_pkts;
u32 sent;
u32 acked;
struct list_head publications;
u32 pub_count;
u32 probing_state;
u32 probing_interval;
u32 last_in_seqno;
struct timer_list timer;
struct tipc_node_subscr subscription;
};
extern spinlock_t tipc_port_list_lock;
struct port_list;
int tipc_port_recv_sections(struct port *p_ptr, u32 num_sect,
struct iovec const *msg_sect);
int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
struct iovec const *msg_sect, u32 num_sect,
int err);
struct sk_buff *tipc_port_get_ports(void);
struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space);
void tipc_port_recv_proto_msg(struct sk_buff *buf);
void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp);
void tipc_port_reinit(void);
/**
* tipc_port_lock - lock port instance referred to and return its pointer
*/
static inline struct port *tipc_port_lock(u32 ref)
{
return (struct port *)tipc_ref_lock(ref);
}
/**
* tipc_port_unlock - unlock a port instance
*
* Can use pointer instead of tipc_ref_unlock() since port is already locked.
*/
static inline void tipc_port_unlock(struct port *p_ptr)
{
spin_unlock_bh(p_ptr->publ.lock);
}
static inline struct port* tipc_port_deref(u32 ref)
{
return (struct port *)tipc_ref_deref(ref);
}
static inline u32 tipc_peer_port(struct port *p_ptr)
{
return msg_destport(&p_ptr->publ.phdr);
}
static inline u32 tipc_peer_node(struct port *p_ptr)
{
return msg_destnode(&p_ptr->publ.phdr);
}
static inline int tipc_port_congested(struct port *p_ptr)
{
return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
}
/**
* tipc_port_recv_msg - receive message from lower layer and deliver to port user
*/
static inline int tipc_port_recv_msg(struct sk_buff *buf)
{
struct port *p_ptr;
struct tipc_msg *msg = buf_msg(buf);
u32 destport = msg_destport(msg);
u32 dsz = msg_data_sz(msg);
u32 err;
/* forward unresolved named message */
if (unlikely(!destport)) {
tipc_net_route_msg(buf);
return dsz;
}
/* validate destination & pass to port, otherwise reject message */
p_ptr = tipc_port_lock(destport);
if (likely(p_ptr)) {
if (likely(p_ptr->publ.connected)) {
if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) ||
(unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) ||
(unlikely(!msg_connected(msg)))) {
err = TIPC_ERR_NO_PORT;
tipc_port_unlock(p_ptr);
goto reject;
}
}
err = p_ptr->dispatcher(&p_ptr->publ, buf);
tipc_port_unlock(p_ptr);
if (likely(!err))
return dsz;
} else {
err = TIPC_ERR_NO_PORT;
}
reject:
dbg("port->rejecting, err = %x..\n",err);
return tipc_reject_msg(buf, err);
}
#endif
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