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1 | /* |
2 | * net/tipc/core.h: Include file for TIPC global declarations |
3 | * |
4 | * Copyright (c) 2005-2006, 2013 Ericsson AB |
5 | * Copyright (c) 2005-2007, 2010-2013, 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_CORE_H |
38 | #define _TIPC_CORE_H |
39 | |
40 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
41 | |
42 | #include <linux/tipc.h> |
43 | #include <linux/tipc_config.h> |
44 | #include <linux/types.h> |
45 | #include <linux/kernel.h> |
46 | #include <linux/errno.h> |
47 | #include <linux/mm.h> |
48 | #include <linux/timer.h> |
49 | #include <linux/string.h> |
50 | #include <linux/uaccess.h> |
51 | #include <linux/interrupt.h> |
52 | #include <linux/atomic.h> |
53 | #include <asm/hardirq.h> |
54 | #include <linux/netdevice.h> |
55 | #include <linux/in.h> |
56 | #include <linux/list.h> |
57 | #include <linux/slab.h> |
58 | #include <linux/vmalloc.h> |
59 | |
60 | |
61 | #define TIPC_MOD_VER "2.0.0" |
62 | |
63 | #define ULTRA_STRING_MAX_LEN 32768 |
64 | #define TIPC_MAX_SUBSCRIPTIONS 65535 |
65 | #define TIPC_MAX_PUBLICATIONS 65535 |
66 | |
67 | struct tipc_msg; /* msg.h */ |
68 | |
69 | int tipc_snprintf(char *buf, int len, const char *fmt, ...); |
70 | |
71 | /* |
72 | * TIPC-specific error codes |
73 | */ |
74 | #define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */ |
75 | |
76 | /* |
77 | * Global configuration variables |
78 | */ |
79 | extern u32 tipc_own_addr __read_mostly; |
80 | extern int tipc_max_ports __read_mostly; |
81 | extern int tipc_net_id __read_mostly; |
82 | extern int sysctl_tipc_rmem[3] __read_mostly; |
83 | |
84 | /* |
85 | * Other global variables |
86 | */ |
87 | extern int tipc_random __read_mostly; |
88 | |
89 | /* |
90 | * Routines available to privileged subsystems |
91 | */ |
92 | int tipc_handler_start(void); |
93 | void tipc_handler_stop(void); |
94 | int tipc_netlink_start(void); |
95 | void tipc_netlink_stop(void); |
96 | int tipc_socket_init(void); |
97 | void tipc_socket_stop(void); |
98 | int tipc_sock_create_local(int type, struct socket **res); |
99 | void tipc_sock_release_local(struct socket *sock); |
100 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, |
101 | int flags); |
102 | |
103 | #ifdef CONFIG_SYSCTL |
104 | int tipc_register_sysctl(void); |
105 | void tipc_unregister_sysctl(void); |
106 | #else |
107 | #define tipc_register_sysctl() 0 |
108 | #define tipc_unregister_sysctl() |
109 | #endif |
110 | |
111 | /* |
112 | * TIPC timer and signal code |
113 | */ |
114 | typedef void (*Handler) (unsigned long); |
115 | |
116 | u32 tipc_k_signal(Handler routine, unsigned long argument); |
117 | |
118 | /** |
119 | * k_init_timer - initialize a timer |
120 | * @timer: pointer to timer structure |
121 | * @routine: pointer to routine to invoke when timer expires |
122 | * @argument: value to pass to routine when timer expires |
123 | * |
124 | * Timer must be initialized before use (and terminated when no longer needed). |
125 | */ |
126 | static inline void k_init_timer(struct timer_list *timer, Handler routine, |
127 | unsigned long argument) |
128 | { |
129 | setup_timer(timer, routine, argument); |
130 | } |
131 | |
132 | /** |
133 | * k_start_timer - start a timer |
134 | * @timer: pointer to timer structure |
135 | * @msec: time to delay (in ms) |
136 | * |
137 | * Schedules a previously initialized timer for later execution. |
138 | * If timer is already running, the new timeout overrides the previous request. |
139 | * |
140 | * To ensure the timer doesn't expire before the specified delay elapses, |
141 | * the amount of delay is rounded up when converting to the jiffies |
142 | * then an additional jiffy is added to account for the fact that |
143 | * the starting time may be in the middle of the current jiffy. |
144 | */ |
145 | static inline void k_start_timer(struct timer_list *timer, unsigned long msec) |
146 | { |
147 | mod_timer(timer, jiffies + msecs_to_jiffies(msec) + 1); |
148 | } |
149 | |
150 | /** |
151 | * k_cancel_timer - cancel a timer |
152 | * @timer: pointer to timer structure |
153 | * |
154 | * Cancels a previously initialized timer. |
155 | * Can be called safely even if the timer is already inactive. |
156 | * |
157 | * WARNING: Must not be called when holding locks required by the timer's |
158 | * timeout routine, otherwise deadlock can occur on SMP systems! |
159 | */ |
160 | static inline void k_cancel_timer(struct timer_list *timer) |
161 | { |
162 | del_timer_sync(timer); |
163 | } |
164 | |
165 | /** |
166 | * k_term_timer - terminate a timer |
167 | * @timer: pointer to timer structure |
168 | * |
169 | * Prevents further use of a previously initialized timer. |
170 | * |
171 | * WARNING: Caller must ensure timer isn't currently running. |
172 | * |
173 | * (Do not "enhance" this routine to automatically cancel an active timer, |
174 | * otherwise deadlock can arise when a timeout routine calls k_term_timer.) |
175 | */ |
176 | static inline void k_term_timer(struct timer_list *timer) |
177 | { |
178 | } |
179 | |
180 | /* |
181 | * TIPC message buffer code |
182 | * |
183 | * TIPC message buffer headroom reserves space for the worst-case |
184 | * link-level device header (in case the message is sent off-node). |
185 | * |
186 | * Note: Headroom should be a multiple of 4 to ensure the TIPC header fields |
187 | * are word aligned for quicker access |
188 | */ |
189 | #define BUF_HEADROOM LL_MAX_HEADER |
190 | |
191 | struct tipc_skb_cb { |
192 | void *handle; |
193 | bool deferred; |
194 | }; |
195 | |
196 | #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0])) |
197 | |
198 | static inline struct tipc_msg *buf_msg(struct sk_buff *skb) |
199 | { |
200 | return (struct tipc_msg *)skb->data; |
201 | } |
202 | |
203 | struct sk_buff *tipc_buf_acquire(u32 size); |
204 | |
205 | #endif |
206 |
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