summaryrefslogtreecommitdiffstats
path: root/net/tipc/port.h
blob: f4a8c2be3faa2f48ad3a3b2247aac26ddf598ab9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
/*
 * net/tipc/port.h: Include file for TIPC port code
 * 
 * Copyright (c) 1994-2006, Ericsson AB
 * Copyright (c) 2004-2005, 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
 * @congested_link: ptr to congested link port is waiting on
 * @waiting_pkts:
 * @sent:
 * @acked:
 * @publications: list of publications for port
 * @pub_count: total # of publications port has made during its lifetime
 * @max_pkt: maximum packet size "hint" used when building messages sent by port
 * @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;
	struct link *congested_link;
	u32 waiting_pkts;
	u32 sent;
	u32 acked;
	struct list_head publications;
	u32 pub_count;
	u32 max_pkt;
	u32 probing_state;
	u32 probing_interval;
	u32 last_in_seqno;
	struct timer_list timer;
	struct node_subscr subscription;
};

extern spinlock_t port_list_lock;
struct port_list;

int port_recv_sections(struct port *p_ptr, u32 num_sect, 
		       struct iovec const *msg_sect);
int port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
			 struct iovec const *msg_sect, u32 num_sect,
			 int err);
struct sk_buff *port_get_ports(void);
struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space);
void port_recv_proto_msg(struct sk_buff *buf);
void port_recv_mcast(struct sk_buff *buf, struct port_list *dp);
void port_reinit(void);

/**
 * port_lock - lock port instance referred to and return its pointer
 */

static inline struct port *port_lock(u32 ref)
{
	return (struct port *)ref_lock(ref);
}

/** 
 * port_unlock - unlock a port instance
 * 
 * Can use pointer instead of ref_unlock() since port is already locked.
 */

static inline void port_unlock(struct port *p_ptr)
{
	spin_unlock_bh(p_ptr->publ.lock);
}

static inline struct port* port_deref(u32 ref)
{
	return (struct port *)ref_deref(ref);
}

static inline u32 peer_port(struct port *p_ptr)
{
	return msg_destport(&p_ptr->publ.phdr);
}

static inline u32 peer_node(struct port *p_ptr)
{
	return msg_destnode(&p_ptr->publ.phdr);
}

static inline int port_congested(struct port *p_ptr)
{
	return((p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2));
}

/** 
 * port_recv_msg - receive message from lower layer and deliver to port user
 */

static inline int 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)) {
		net_route_msg(buf);
		return dsz;
	}

	/* validate destination & pass to port, otherwise reject message */
	p_ptr = port_lock(destport);
	if (likely(p_ptr)) {
		if (likely(p_ptr->publ.connected)) {
			if ((unlikely(msg_origport(msg) != peer_port(p_ptr))) ||
			    (unlikely(msg_orignode(msg) != peer_node(p_ptr))) ||
			    (unlikely(!msg_connected(msg)))) {
				err = TIPC_ERR_NO_PORT;
				port_unlock(p_ptr);
				goto reject;
			}
		}
		err = p_ptr->dispatcher(&p_ptr->publ, buf);
		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