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1/*
2 * net/tipc/bearer.h: Include file for TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, 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 "msg.h"
43#include <net/genetlink.h>
44
45#define MAX_MEDIA 3
46
47/* Identifiers associated with TIPC message header media address info
48 * - address info field is 32 bytes long
49 * - the field's actual content and length is defined per media
50 * - remaining unused bytes in the field are set to zero
51 */
52#define TIPC_MEDIA_INFO_SIZE 32
53#define TIPC_MEDIA_TYPE_OFFSET 3
54#define TIPC_MEDIA_ADDR_OFFSET 4
55
56/*
57 * Identifiers of supported TIPC media types
58 */
59#define TIPC_MEDIA_TYPE_ETH 1
60#define TIPC_MEDIA_TYPE_IB 2
61#define TIPC_MEDIA_TYPE_UDP 3
62
63/* Minimum bearer MTU */
64#define TIPC_MIN_BEARER_MTU (MAX_H_SIZE + INT_H_SIZE)
65
66/* Identifiers for distinguishing between broadcast/multicast and replicast
67 */
68#define TIPC_BROADCAST_SUPPORT 1
69#define TIPC_REPLICAST_SUPPORT 2
70
71/**
72 * struct tipc_media_addr - destination address used by TIPC bearers
73 * @value: address info (format defined by media)
74 * @media_id: TIPC media type identifier
75 * @broadcast: non-zero if address is a broadcast address
76 */
77struct tipc_media_addr {
78 u8 value[TIPC_MEDIA_INFO_SIZE];
79 u8 media_id;
80 u8 broadcast;
81};
82
83struct tipc_bearer;
84
85/**
86 * struct tipc_media - Media specific info exposed to generic bearer layer
87 * @send_msg: routine which handles buffer transmission
88 * @enable_media: routine which enables a media
89 * @disable_media: routine which disables a media
90 * @addr2str: convert media address format to string
91 * @addr2msg: convert from media addr format to discovery msg addr format
92 * @msg2addr: convert from discovery msg addr format to media addr format
93 * @raw2addr: convert from raw addr format to media addr format
94 * @priority: default link (and bearer) priority
95 * @tolerance: default time (in ms) before declaring link failure
96 * @min_win: minimum window (in packets) before declaring link congestion
97 * @max_win: maximum window (in packets) before declaring link congestion
98 * @mtu: max packet size bearer can support for media type not dependent on
99 * underlying device MTU
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 min_win;
124 u32 max_win;
125 u32 mtu;
126 u32 type_id;
127 u32 hwaddr_len;
128 char name[TIPC_MAX_MEDIA_NAME];
129};
130
131/**
132 * struct tipc_bearer - Generic TIPC bearer structure
133 * @media_ptr: pointer to additional media-specific information about bearer
134 * @mtu: max packet size bearer can support
135 * @addr: media-specific address associated with bearer
136 * @name: bearer name (format = media:interface)
137 * @media: ptr to media structure associated with bearer
138 * @bcast_addr: media address used in broadcasting
139 * @pt: packet type for bearer
140 * @rcu: rcu struct for tipc_bearer
141 * @priority: default link priority for bearer
142 * @min_win: minimum window (in packets) before declaring link congestion
143 * @max_win: maximum window (in packets) before declaring link congestion
144 * @tolerance: default link tolerance for bearer
145 * @domain: network domain to which links can be established
146 * @identity: array index of this bearer within TIPC bearer array
147 * @disc: ptr to link setup request
148 * @net_plane: network plane ('A' through 'H') currently associated with bearer
149 * @up: bearer up flag (bit 0)
150 * @refcnt: tipc_bearer reference counter
151 *
152 * Note: media-specific code is responsible for initialization of the fields
153 * indicated below when a bearer is enabled; TIPC's generic bearer code takes
154 * care of initializing all other fields.
155 */
156struct tipc_bearer {
157 void __rcu *media_ptr; /* initialized by media */
158 u32 mtu; /* initialized by media */
159 struct tipc_media_addr addr; /* initialized by media */
160 char name[TIPC_MAX_BEARER_NAME];
161 struct tipc_media *media;
162 struct tipc_media_addr bcast_addr;
163 struct packet_type pt;
164 struct rcu_head rcu;
165 u32 priority;
166 u32 min_win;
167 u32 max_win;
168 u32 tolerance;
169 u32 domain;
170 u32 identity;
171 struct tipc_discoverer *disc;
172 char net_plane;
173 unsigned long up;
174 refcount_t refcnt;
175};
176
177struct tipc_bearer_names {
178 char media_name[TIPC_MAX_MEDIA_NAME];
179 char if_name[TIPC_MAX_IF_NAME];
180};
181
182/*
183 * TIPC routines available to supported media types
184 */
185
186void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b);
187
188/*
189 * Routines made available to TIPC by supported media types
190 */
191extern struct tipc_media eth_media_info;
192
193#ifdef CONFIG_TIPC_MEDIA_IB
194extern struct tipc_media ib_media_info;
195#endif
196#ifdef CONFIG_TIPC_MEDIA_UDP
197extern struct tipc_media udp_media_info;
198#endif
199
200int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
201int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
202int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);
203int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);
204int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb);
205int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info);
206int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info);
207int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info);
208int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info);
209
210int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb);
211int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info);
212int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info);
213int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info);
214
215int tipc_media_set_priority(const char *name, u32 new_value);
216int tipc_media_set_window(const char *name, u32 new_value);
217int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a);
218int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
219 struct nlattr *attrs[]);
220bool tipc_bearer_hold(struct tipc_bearer *b);
221void tipc_bearer_put(struct tipc_bearer *b);
222void tipc_disable_l2_media(struct tipc_bearer *b);
223int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
224 struct tipc_bearer *b, struct tipc_media_addr *dest);
225
226void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest);
227void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest);
228struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name);
229int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id);
230struct tipc_media *tipc_media_find(const char *name);
231int tipc_bearer_setup(void);
232void tipc_bearer_cleanup(void);
233void tipc_bearer_stop(struct net *net);
234int tipc_bearer_mtu(struct net *net, u32 bearer_id);
235bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id);
236void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
237 struct sk_buff *skb,
238 struct tipc_media_addr *dest);
239void tipc_bearer_xmit(struct net *net, u32 bearer_id,
240 struct sk_buff_head *xmitq,
241 struct tipc_media_addr *dst,
242 struct tipc_node *__dnode);
243void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
244 struct sk_buff_head *xmitq);
245void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts);
246int tipc_attach_loopback(struct net *net);
247void tipc_detach_loopback(struct net *net);
248
249static inline void tipc_loopback_trace(struct net *net,
250 struct sk_buff_head *pkts)
251{
252 if (unlikely(dev_nit_active(net->loopback_dev)))
253 tipc_clone_to_loopback(net, pkts);
254}
255
256/* check if device MTU is too low for tipc headers */
257static inline bool tipc_mtu_bad(struct net_device *dev, unsigned int reserve)
258{
259 if (dev->mtu >= TIPC_MIN_BEARER_MTU + reserve)
260 return false;
261 netdev_warn(dev, "MTU too low for tipc bearer\n");
262 return true;
263}
264
265#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 2
43#define MAX_MEDIA 2
44
45/*
46 * Identifiers associated with TIPC message header media address info
47 *
48 * - address info field is 20 bytes long
49 * - media type identifier located at offset 3
50 * - remaining bytes vary according to media type
51 */
52#define TIPC_MEDIA_ADDR_SIZE 20
53#define TIPC_MEDIA_TYPE_OFFSET 3
54
55/*
56 * Identifiers of supported TIPC media types
57 */
58#define TIPC_MEDIA_TYPE_ETH 1
59
60/*
61 * struct tipc_media_addr - destination address used by TIPC bearers
62 * @value: address info (format defined by media)
63 * @media_id: TIPC media type identifier
64 * @broadcast: non-zero if address is a broadcast address
65 */
66struct tipc_media_addr {
67 u8 value[TIPC_MEDIA_ADDR_SIZE];
68 u8 media_id;
69 u8 broadcast;
70};
71
72struct tipc_bearer;
73
74/**
75 * struct tipc_media - TIPC media information available to internal users
76 * @send_msg: routine which handles buffer transmission
77 * @enable_bearer: routine which enables a bearer
78 * @disable_bearer: routine which disables a bearer
79 * @addr2str: routine which converts media address to string
80 * @str2addr: routine which converts media address from string
81 * @addr2msg: routine which converts media address to protocol message area
82 * @msg2addr: routine which converts media address from protocol message area
83 * @bcast_addr: media address used in broadcasting
84 * @priority: default link (and bearer) priority
85 * @tolerance: default time (in ms) before declaring link failure
86 * @window: default window (in packets) before declaring link congestion
87 * @type_id: TIPC media identifier
88 * @name: media name
89 */
90struct tipc_media {
91 int (*send_msg)(struct sk_buff *buf,
92 struct tipc_bearer *b_ptr,
93 struct tipc_media_addr *dest);
94 int (*enable_bearer)(struct tipc_bearer *b_ptr);
95 void (*disable_bearer)(struct tipc_bearer *b_ptr);
96 int (*addr2str)(struct tipc_media_addr *a, char *str_buf, int str_size);
97 int (*str2addr)(struct tipc_media_addr *a, char *str_buf);
98 int (*addr2msg)(struct tipc_media_addr *a, char *msg_area);
99 int (*msg2addr)(struct tipc_media_addr *a, char *msg_area);
100 struct tipc_media_addr bcast_addr;
101 u32 priority;
102 u32 tolerance;
103 u32 window;
104 u32 type_id;
105 char name[TIPC_MAX_MEDIA_NAME];
106};
107
108/**
109 * struct tipc_bearer - TIPC bearer structure
110 * @usr_handle: pointer to additional media-specific information about bearer
111 * @mtu: max packet size bearer can support
112 * @blocked: non-zero if bearer is blocked
113 * @lock: spinlock for controlling access to bearer
114 * @addr: media-specific address associated with bearer
115 * @name: bearer name (format = media:interface)
116 * @media: ptr to media structure associated with bearer
117 * @priority: default link priority for bearer
118 * @window: default window size for bearer
119 * @tolerance: default link tolerance for bearer
120 * @identity: array index of this bearer within TIPC bearer array
121 * @link_req: ptr to (optional) structure making periodic link setup requests
122 * @links: list of non-congested links associated with bearer
123 * @cong_links: list of congested links associated with bearer
124 * @active: non-zero if bearer structure is represents a bearer
125 * @net_plane: network plane ('A' through 'H') currently associated with bearer
126 * @nodes: indicates which nodes in cluster can be reached through bearer
127 *
128 * Note: media-specific code is responsible for initialization of the fields
129 * indicated below when a bearer is enabled; TIPC's generic bearer code takes
130 * care of initializing all other fields.
131 */
132struct tipc_bearer {
133 void *usr_handle; /* initalized by media */
134 u32 mtu; /* initalized by media */
135 int blocked; /* initalized by media */
136 struct tipc_media_addr addr; /* initalized by media */
137 char name[TIPC_MAX_BEARER_NAME];
138 spinlock_t lock;
139 struct tipc_media *media;
140 u32 priority;
141 u32 window;
142 u32 tolerance;
143 u32 identity;
144 struct tipc_link_req *link_req;
145 struct list_head links;
146 struct list_head cong_links;
147 int active;
148 char net_plane;
149 struct tipc_node_map nodes;
150};
151
152struct tipc_bearer_names {
153 char media_name[TIPC_MAX_MEDIA_NAME];
154 char if_name[TIPC_MAX_IF_NAME];
155};
156
157struct tipc_link;
158
159extern struct tipc_bearer tipc_bearers[];
160
161/*
162 * TIPC routines available to supported media types
163 */
164int tipc_register_media(struct tipc_media *m_ptr);
165
166void tipc_recv_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr);
167
168int tipc_block_bearer(const char *name);
169void tipc_continue(struct tipc_bearer *tb_ptr);
170
171int tipc_enable_bearer(const char *bearer_name, u32 disc_domain, u32 priority);
172int tipc_disable_bearer(const char *name);
173
174/*
175 * Routines made available to TIPC by supported media types
176 */
177int tipc_eth_media_start(void);
178void tipc_eth_media_stop(void);
179
180int tipc_media_set_priority(const char *name, u32 new_value);
181int tipc_media_set_window(const char *name, u32 new_value);
182void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a);
183struct sk_buff *tipc_media_get_names(void);
184
185struct sk_buff *tipc_bearer_get_names(void);
186void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest);
187void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest);
188void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr);
189struct tipc_bearer *tipc_bearer_find(const char *name);
190struct tipc_bearer *tipc_bearer_find_interface(const char *if_name);
191struct tipc_media *tipc_media_find(const char *name);
192int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr,
193 struct tipc_link *l_ptr);
194int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr);
195void tipc_bearer_stop(void);
196void tipc_bearer_lock_push(struct tipc_bearer *b_ptr);
197
198
199/**
200 * tipc_bearer_send- sends buffer to destination over bearer
201 *
202 * Returns true (1) if successful, or false (0) if unable to send
203 *
204 * IMPORTANT:
205 * The media send routine must not alter the buffer being passed in
206 * as it may be needed for later retransmission!
207 *
208 * If the media send routine returns a non-zero value (indicating that
209 * it was unable to send the buffer), it must:
210 * 1) mark the bearer as blocked,
211 * 2) call tipc_continue() once the bearer is able to send again.
212 * Media types that are unable to meet these two critera must ensure their
213 * send routine always returns success -- even if the buffer was not sent --
214 * and let TIPC's link code deal with the undelivered message.
215 */
216static inline int tipc_bearer_send(struct tipc_bearer *b_ptr,
217 struct sk_buff *buf,
218 struct tipc_media_addr *dest)
219{
220 return !b_ptr->media->send_msg(buf, b_ptr, dest);
221}
222
223#endif /* _TIPC_BEARER_H */