Root/net/tipc/port.h

1/*
2 * net/tipc/port.h: Include file for TIPC port code
3 *
4 * Copyright (c) 1994-2007, Ericsson AB
5 * Copyright (c) 2004-2007, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#ifndef _TIPC_PORT_H
38#define _TIPC_PORT_H
39
40#include "core.h"
41#include "ref.h"
42#include "net.h"
43#include "msg.h"
44#include "dbg.h"
45#include "node_subscr.h"
46
47/**
48 * struct user_port - TIPC user port (used with native API)
49 * @user_ref: id of user who created user port
50 * @usr_handle: user-specified field
51 * @ref: object reference to associated TIPC port
52 * <various callback routines>
53 * @uport_list: adjacent user ports in list of ports held by user
54 */
55
56struct user_port {
57    u32 user_ref;
58    void *usr_handle;
59    u32 ref;
60    tipc_msg_err_event err_cb;
61    tipc_named_msg_err_event named_err_cb;
62    tipc_conn_shutdown_event conn_err_cb;
63    tipc_msg_event msg_cb;
64    tipc_named_msg_event named_msg_cb;
65    tipc_conn_msg_event conn_msg_cb;
66    tipc_continue_event continue_event_cb;
67    struct list_head uport_list;
68};
69
70/**
71 * struct port - TIPC port structure
72 * @publ: TIPC port info available to privileged users
73 * @port_list: adjacent ports in TIPC's global list of ports
74 * @dispatcher: ptr to routine which handles received messages
75 * @wakeup: ptr to routine to call when port is no longer congested
76 * @user_port: ptr to user port associated with port (if any)
77 * @wait_list: adjacent ports in list of ports waiting on link congestion
78 * @waiting_pkts:
79 * @sent:
80 * @acked:
81 * @publications: list of publications for port
82 * @pub_count: total # of publications port has made during its lifetime
83 * @probing_state:
84 * @probing_interval:
85 * @last_in_seqno:
86 * @timer_ref:
87 * @subscription: "node down" subscription used to terminate failed connections
88 */
89
90struct port {
91    struct tipc_port publ;
92    struct list_head port_list;
93    u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
94    void (*wakeup)(struct tipc_port *);
95    struct user_port *user_port;
96    struct list_head wait_list;
97    u32 waiting_pkts;
98    u32 sent;
99    u32 acked;
100    struct list_head publications;
101    u32 pub_count;
102    u32 probing_state;
103    u32 probing_interval;
104    u32 last_in_seqno;
105    struct timer_list timer;
106    struct tipc_node_subscr subscription;
107};
108
109extern spinlock_t tipc_port_list_lock;
110struct port_list;
111
112int tipc_port_recv_sections(struct port *p_ptr, u32 num_sect,
113                struct iovec const *msg_sect);
114int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
115                  struct iovec const *msg_sect, u32 num_sect,
116                  int err);
117struct sk_buff *tipc_port_get_ports(void);
118struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space);
119void tipc_port_recv_proto_msg(struct sk_buff *buf);
120void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp);
121void tipc_port_reinit(void);
122
123/**
124 * tipc_port_lock - lock port instance referred to and return its pointer
125 */
126
127static inline struct port *tipc_port_lock(u32 ref)
128{
129    return (struct port *)tipc_ref_lock(ref);
130}
131
132/**
133 * tipc_port_unlock - unlock a port instance
134 *
135 * Can use pointer instead of tipc_ref_unlock() since port is already locked.
136 */
137
138static inline void tipc_port_unlock(struct port *p_ptr)
139{
140    spin_unlock_bh(p_ptr->publ.lock);
141}
142
143static inline struct port* tipc_port_deref(u32 ref)
144{
145    return (struct port *)tipc_ref_deref(ref);
146}
147
148static inline u32 tipc_peer_port(struct port *p_ptr)
149{
150    return msg_destport(&p_ptr->publ.phdr);
151}
152
153static inline u32 tipc_peer_node(struct port *p_ptr)
154{
155    return msg_destnode(&p_ptr->publ.phdr);
156}
157
158static inline int tipc_port_congested(struct port *p_ptr)
159{
160    return((p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2));
161}
162
163/**
164 * tipc_port_recv_msg - receive message from lower layer and deliver to port user
165 */
166
167static inline int tipc_port_recv_msg(struct sk_buff *buf)
168{
169    struct port *p_ptr;
170    struct tipc_msg *msg = buf_msg(buf);
171    u32 destport = msg_destport(msg);
172    u32 dsz = msg_data_sz(msg);
173    u32 err;
174
175    /* forward unresolved named message */
176    if (unlikely(!destport)) {
177        tipc_net_route_msg(buf);
178        return dsz;
179    }
180
181    /* validate destination & pass to port, otherwise reject message */
182    p_ptr = tipc_port_lock(destport);
183    if (likely(p_ptr)) {
184        if (likely(p_ptr->publ.connected)) {
185            if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) ||
186                (unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) ||
187                (unlikely(!msg_connected(msg)))) {
188                err = TIPC_ERR_NO_PORT;
189                tipc_port_unlock(p_ptr);
190                goto reject;
191            }
192        }
193        err = p_ptr->dispatcher(&p_ptr->publ, buf);
194        tipc_port_unlock(p_ptr);
195        if (likely(!err))
196            return dsz;
197    } else {
198        err = TIPC_ERR_NO_PORT;
199    }
200reject:
201    dbg("port->rejecting, err = %x..\n",err);
202    return tipc_reject_msg(buf, err);
203}
204
205#endif
206

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