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Linux/net/tipc/bearer.h

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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  */
 77 struct tipc_media_addr {
 78         u8 value[TIPC_MEDIA_INFO_SIZE];
 79         u8 media_id;
 80         u8 broadcast;
 81 };
 82 
 83 struct 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  * @window: default window (in packets) before declaring link congestion
 97  * @mtu: max packet size bearer can support for media type not dependent on
 98  * underlying device MTU
 99  * @type_id: TIPC media identifier
100  * @hwaddr_len: TIPC media address len
101  * @name: media name
102  */
103 struct tipc_media {
104         int (*send_msg)(struct net *net, struct sk_buff *buf,
105                         struct tipc_bearer *b,
106                         struct tipc_media_addr *dest);
107         int (*enable_media)(struct net *net, struct tipc_bearer *b,
108                             struct nlattr *attr[]);
109         void (*disable_media)(struct tipc_bearer *b);
110         int (*addr2str)(struct tipc_media_addr *addr,
111                         char *strbuf,
112                         int bufsz);
113         int (*addr2msg)(char *msg, struct tipc_media_addr *addr);
114         int (*msg2addr)(struct tipc_bearer *b,
115                         struct tipc_media_addr *addr,
116                         char *msg);
117         int (*raw2addr)(struct tipc_bearer *b,
118                         struct tipc_media_addr *addr,
119                         char *raw);
120         u32 priority;
121         u32 tolerance;
122         u32 window;
123         u32 mtu;
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  * @pt: packet type for bearer
138  * @rcu: rcu struct for tipc_bearer
139  * @priority: default link priority for bearer
140  * @window: default window size for bearer
141  * @tolerance: default link tolerance for bearer
142  * @domain: network domain to which links can be established
143  * @identity: array index of this bearer within TIPC bearer array
144  * @link_req: ptr to (optional) structure making periodic link setup requests
145  * @net_plane: network plane ('A' through 'H') currently associated with 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  */
151 struct 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 packet_type pt;
159         struct rcu_head rcu;
160         u32 priority;
161         u32 window;
162         u32 tolerance;
163         u32 domain;
164         u32 identity;
165         struct tipc_discoverer *disc;
166         char net_plane;
167         unsigned long up;
168 };
169 
170 struct 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 
179 void 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  */
184 extern struct tipc_media eth_media_info;
185 
186 #ifdef CONFIG_TIPC_MEDIA_IB
187 extern struct tipc_media ib_media_info;
188 #endif
189 #ifdef CONFIG_TIPC_MEDIA_UDP
190 extern struct tipc_media udp_media_info;
191 #endif
192 
193 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
194 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
195 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);
196 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);
197 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb);
198 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info);
199 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info);
200 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info);
201 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info);
202 
203 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb);
204 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info);
205 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info);
206 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info);
207 
208 int tipc_media_set_priority(const char *name, u32 new_value);
209 int tipc_media_set_window(const char *name, u32 new_value);
210 int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a);
211 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
212                          struct nlattr *attrs[]);
213 void tipc_disable_l2_media(struct tipc_bearer *b);
214 int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
215                      struct tipc_bearer *b, struct tipc_media_addr *dest);
216 
217 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest);
218 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest);
219 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name);
220 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id);
221 struct tipc_media *tipc_media_find(const char *name);
222 int tipc_bearer_setup(void);
223 void tipc_bearer_cleanup(void);
224 void tipc_bearer_stop(struct net *net);
225 int tipc_bearer_mtu(struct net *net, u32 bearer_id);
226 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id);
227 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
228                           struct sk_buff *skb,
229                           struct tipc_media_addr *dest);
230 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
231                       struct sk_buff_head *xmitq,
232                       struct tipc_media_addr *dst);
233 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
234                          struct sk_buff_head *xmitq);
235 
236 /* check if device MTU is too low for tipc headers */
237 static inline bool tipc_mtu_bad(struct net_device *dev, unsigned int reserve)
238 {
239         if (dev->mtu >= TIPC_MIN_BEARER_MTU + reserve)
240                 return false;
241         netdev_warn(dev, "MTU too low for tipc bearer\n");
242         return true;
243 }
244 
245 #endif  /* _TIPC_BEARER_H */
246 

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