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1/*
2 * net/tipc/bearer.h: Include file for TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2014, Ericsson AB
5 * Copyright (c) 2005, 2010-2011, 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_BEARER_H
38#define _TIPC_BEARER_H
39
40#include "netlink.h"
41#include "core.h"
42#include <net/genetlink.h>
43
44#define MAX_MEDIA 3
45#define MAX_NODES 4096
46#define WSIZE 32
47
48/* Identifiers associated with TIPC message header media address info
49 * - address info field is 32 bytes long
50 * - the field's actual content and length is defined per media
51 * - remaining unused bytes in the field are set to zero
52 */
53#define TIPC_MEDIA_INFO_SIZE 32
54#define TIPC_MEDIA_TYPE_OFFSET 3
55#define TIPC_MEDIA_ADDR_OFFSET 4
56
57/*
58 * Identifiers of supported TIPC media types
59 */
60#define TIPC_MEDIA_TYPE_ETH 1
61#define TIPC_MEDIA_TYPE_IB 2
62#define TIPC_MEDIA_TYPE_UDP 3
63
64/**
65 * struct tipc_node_map - set of node identifiers
66 * @count: # of nodes in set
67 * @map: bitmap of node identifiers that are in the set
68 */
69struct tipc_node_map {
70 u32 count;
71 u32 map[MAX_NODES / WSIZE];
72};
73
74/**
75 * struct tipc_media_addr - destination address used by TIPC bearers
76 * @value: address info (format defined by media)
77 * @media_id: TIPC media type identifier
78 * @broadcast: non-zero if address is a broadcast address
79 */
80struct tipc_media_addr {
81 u8 value[TIPC_MEDIA_INFO_SIZE];
82 u8 media_id;
83 u8 broadcast;
84};
85
86struct tipc_bearer;
87
88/**
89 * struct tipc_media - Media specific info exposed to generic bearer layer
90 * @send_msg: routine which handles buffer transmission
91 * @enable_media: routine which enables a media
92 * @disable_media: routine which disables a media
93 * @addr2str: convert media address format to string
94 * @addr2msg: convert from media addr format to discovery msg addr format
95 * @msg2addr: convert from discovery msg addr format to media addr format
96 * @raw2addr: convert from raw addr format to media addr format
97 * @priority: default link (and bearer) priority
98 * @tolerance: default time (in ms) before declaring link failure
99 * @window: default window (in packets) before declaring link congestion
100 * @type_id: TIPC media identifier
101 * @hwaddr_len: TIPC media address len
102 * @name: media name
103 */
104struct tipc_media {
105 int (*send_msg)(struct net *net, struct sk_buff *buf,
106 struct tipc_bearer *b,
107 struct tipc_media_addr *dest);
108 int (*enable_media)(struct net *net, struct tipc_bearer *b,
109 struct nlattr *attr[]);
110 void (*disable_media)(struct tipc_bearer *b);
111 int (*addr2str)(struct tipc_media_addr *addr,
112 char *strbuf,
113 int bufsz);
114 int (*addr2msg)(char *msg, struct tipc_media_addr *addr);
115 int (*msg2addr)(struct tipc_bearer *b,
116 struct tipc_media_addr *addr,
117 char *msg);
118 int (*raw2addr)(struct tipc_bearer *b,
119 struct tipc_media_addr *addr,
120 char *raw);
121 u32 priority;
122 u32 tolerance;
123 u32 window;
124 u32 type_id;
125 u32 hwaddr_len;
126 char name[TIPC_MAX_MEDIA_NAME];
127};
128
129/**
130 * struct tipc_bearer - Generic TIPC bearer structure
131 * @media_ptr: pointer to additional media-specific information about bearer
132 * @mtu: max packet size bearer can support
133 * @addr: media-specific address associated with bearer
134 * @name: bearer name (format = media:interface)
135 * @media: ptr to media structure associated with bearer
136 * @bcast_addr: media address used in broadcasting
137 * @rcu: rcu struct for tipc_bearer
138 * @priority: default link priority for bearer
139 * @window: default window size for bearer
140 * @tolerance: default link tolerance for bearer
141 * @domain: network domain to which links can be established
142 * @identity: array index of this bearer within TIPC bearer array
143 * @link_req: ptr to (optional) structure making periodic link setup requests
144 * @net_plane: network plane ('A' through 'H') currently associated with bearer
145 * @nodes: indicates which nodes in cluster can be reached through bearer
146 *
147 * Note: media-specific code is responsible for initialization of the fields
148 * indicated below when a bearer is enabled; TIPC's generic bearer code takes
149 * care of initializing all other fields.
150 */
151struct tipc_bearer {
152 void __rcu *media_ptr; /* initalized by media */
153 u32 mtu; /* initalized by media */
154 struct tipc_media_addr addr; /* initalized by media */
155 char name[TIPC_MAX_BEARER_NAME];
156 struct tipc_media *media;
157 struct tipc_media_addr bcast_addr;
158 struct rcu_head rcu;
159 u32 priority;
160 u32 window;
161 u32 tolerance;
162 u32 domain;
163 u32 identity;
164 struct tipc_link_req *link_req;
165 char net_plane;
166 int node_cnt;
167 struct tipc_node_map nodes;
168};
169
170struct tipc_bearer_names {
171 char media_name[TIPC_MAX_MEDIA_NAME];
172 char if_name[TIPC_MAX_IF_NAME];
173};
174
175/*
176 * TIPC routines available to supported media types
177 */
178
179void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b);
180
181/*
182 * Routines made available to TIPC by supported media types
183 */
184extern struct tipc_media eth_media_info;
185
186#ifdef CONFIG_TIPC_MEDIA_IB
187extern struct tipc_media ib_media_info;
188#endif
189#ifdef CONFIG_TIPC_MEDIA_UDP
190extern struct tipc_media udp_media_info;
191#endif
192
193int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
194int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);
195int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb);
196int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info);
197int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info);
198
199int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb);
200int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info);
201int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info);
202
203int tipc_media_set_priority(const char *name, u32 new_value);
204int tipc_media_set_window(const char *name, u32 new_value);
205void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a);
206int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
207 struct nlattr *attrs[]);
208void tipc_disable_l2_media(struct tipc_bearer *b);
209int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
210 struct tipc_bearer *b, struct tipc_media_addr *dest);
211
212void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest);
213void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest);
214struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name);
215struct tipc_media *tipc_media_find(const char *name);
216int tipc_bearer_setup(void);
217void tipc_bearer_cleanup(void);
218void tipc_bearer_stop(struct net *net);
219int tipc_bearer_mtu(struct net *net, u32 bearer_id);
220void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
221 struct sk_buff *skb,
222 struct tipc_media_addr *dest);
223void tipc_bearer_xmit(struct net *net, u32 bearer_id,
224 struct sk_buff_head *xmitq,
225 struct tipc_media_addr *dst);
226void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
227 struct sk_buff_head *xmitq);
228
229#endif /* _TIPC_BEARER_H */
1/*
2 * net/tipc/bearer.h: Include file for TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, Ericsson AB
5 * Copyright (c) 2005, 2010-2011, 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_BEARER_H
38#define _TIPC_BEARER_H
39
40#include "bcast.h"
41
42#define MAX_BEARERS 8
43#define MAX_MEDIA 4
44
45/*
46 * Identifiers of supported TIPC media types
47 */
48#define TIPC_MEDIA_TYPE_ETH 1
49
50/*
51 * Destination address structure used by TIPC bearers when sending messages
52 *
53 * IMPORTANT: The fields of this structure MUST be stored using the specified
54 * byte order indicated below, as the structure is exchanged between nodes
55 * as part of a link setup process.
56 */
57struct tipc_media_addr {
58 __be32 type; /* bearer type (network byte order) */
59 union {
60 __u8 eth_addr[6]; /* 48 bit Ethernet addr (byte array) */
61 } dev_addr;
62};
63
64struct tipc_bearer;
65
66/**
67 * struct media - TIPC media information available to internal users
68 * @send_msg: routine which handles buffer transmission
69 * @enable_bearer: routine which enables a bearer
70 * @disable_bearer: routine which disables a bearer
71 * @addr2str: routine which converts bearer's address to string form
72 * @bcast_addr: media address used in broadcasting
73 * @priority: default link (and bearer) priority
74 * @tolerance: default time (in ms) before declaring link failure
75 * @window: default window (in packets) before declaring link congestion
76 * @type_id: TIPC media identifier
77 * @name: media name
78 */
79
80struct media {
81 int (*send_msg)(struct sk_buff *buf,
82 struct tipc_bearer *b_ptr,
83 struct tipc_media_addr *dest);
84 int (*enable_bearer)(struct tipc_bearer *b_ptr);
85 void (*disable_bearer)(struct tipc_bearer *b_ptr);
86 char *(*addr2str)(struct tipc_media_addr *a,
87 char *str_buf, int str_size);
88 struct tipc_media_addr bcast_addr;
89 u32 priority;
90 u32 tolerance;
91 u32 window;
92 u32 type_id;
93 char name[TIPC_MAX_MEDIA_NAME];
94};
95
96/**
97 * struct tipc_bearer - TIPC bearer structure
98 * @usr_handle: pointer to additional media-specific information about bearer
99 * @mtu: max packet size bearer can support
100 * @blocked: non-zero if bearer is blocked
101 * @lock: spinlock for controlling access to bearer
102 * @addr: media-specific address associated with bearer
103 * @name: bearer name (format = media:interface)
104 * @media: ptr to media structure associated with bearer
105 * @priority: default link priority for bearer
106 * @identity: array index of this bearer within TIPC bearer array
107 * @link_req: ptr to (optional) structure making periodic link setup requests
108 * @links: list of non-congested links associated with bearer
109 * @cong_links: list of congested links associated with bearer
110 * @active: non-zero if bearer structure is represents a bearer
111 * @net_plane: network plane ('A' through 'H') currently associated with bearer
112 * @nodes: indicates which nodes in cluster can be reached through bearer
113 *
114 * Note: media-specific code is responsible for initialization of the fields
115 * indicated below when a bearer is enabled; TIPC's generic bearer code takes
116 * care of initializing all other fields.
117 */
118struct tipc_bearer {
119 void *usr_handle; /* initalized by media */
120 u32 mtu; /* initalized by media */
121 int blocked; /* initalized by media */
122 struct tipc_media_addr addr; /* initalized by media */
123 char name[TIPC_MAX_BEARER_NAME];
124 spinlock_t lock;
125 struct media *media;
126 u32 priority;
127 u32 identity;
128 struct link_req *link_req;
129 struct list_head links;
130 struct list_head cong_links;
131 int active;
132 char net_plane;
133 struct tipc_node_map nodes;
134};
135
136struct bearer_name {
137 char media_name[TIPC_MAX_MEDIA_NAME];
138 char if_name[TIPC_MAX_IF_NAME];
139};
140
141struct link;
142
143extern struct tipc_bearer tipc_bearers[];
144
145/*
146 * TIPC routines available to supported media types
147 */
148int tipc_register_media(u32 media_type,
149 char *media_name, int (*enable)(struct tipc_bearer *),
150 void (*disable)(struct tipc_bearer *),
151 int (*send_msg)(struct sk_buff *,
152 struct tipc_bearer *, struct tipc_media_addr *),
153 char *(*addr2str)(struct tipc_media_addr *a,
154 char *str_buf, int str_size),
155 struct tipc_media_addr *bcast_addr, const u32 bearer_priority,
156 const u32 link_tolerance, /* [ms] */
157 const u32 send_window_limit);
158
159void tipc_recv_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr);
160
161int tipc_block_bearer(const char *name);
162void tipc_continue(struct tipc_bearer *tb_ptr);
163
164int tipc_enable_bearer(const char *bearer_name, u32 disc_domain, u32 priority);
165int tipc_disable_bearer(const char *name);
166
167/*
168 * Routines made available to TIPC by supported media types
169 */
170int tipc_eth_media_start(void);
171void tipc_eth_media_stop(void);
172
173void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a);
174struct sk_buff *tipc_media_get_names(void);
175
176struct sk_buff *tipc_bearer_get_names(void);
177void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest);
178void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest);
179void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct link *l_ptr);
180struct tipc_bearer *tipc_bearer_find_interface(const char *if_name);
181int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, struct link *l_ptr);
182int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct link *l_ptr);
183void tipc_bearer_stop(void);
184void tipc_bearer_lock_push(struct tipc_bearer *b_ptr);
185
186
187/**
188 * tipc_bearer_send- sends buffer to destination over bearer
189 *
190 * Returns true (1) if successful, or false (0) if unable to send
191 *
192 * IMPORTANT:
193 * The media send routine must not alter the buffer being passed in
194 * as it may be needed for later retransmission!
195 *
196 * If the media send routine returns a non-zero value (indicating that
197 * it was unable to send the buffer), it must:
198 * 1) mark the bearer as blocked,
199 * 2) call tipc_continue() once the bearer is able to send again.
200 * Media types that are unable to meet these two critera must ensure their
201 * send routine always returns success -- even if the buffer was not sent --
202 * and let TIPC's link code deal with the undelivered message.
203 */
204
205static inline int tipc_bearer_send(struct tipc_bearer *b_ptr,
206 struct sk_buff *buf,
207 struct tipc_media_addr *dest)
208{
209 return !b_ptr->media->send_msg(buf, b_ptr, dest);
210}
211
212#endif /* _TIPC_BEARER_H */