net/tipc/bearer.h

   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  * @type_id: TIPC media identifier
  98  * @hwaddr_len: TIPC media address len
  99  * @name: media name
 100  */
 101 struct tipc_media {
 102         int (*send_msg)(struct net *net, struct sk_buff *buf,
 103                         struct tipc_bearer *b,
 104                         struct tipc_media_addr *dest);
 105         int (*enable_media)(struct net *net, struct tipc_bearer *b,
 106                             struct nlattr *attr[]);
 107         void (*disable_media)(struct tipc_bearer *b);
 108         int (*addr2str)(struct tipc_media_addr *addr,
 109                         char *strbuf,
 110                         int bufsz);
 111         int (*addr2msg)(char *msg, struct tipc_media_addr *addr);
 112         int (*msg2addr)(struct tipc_bearer *b,
 113                         struct tipc_media_addr *addr,
 114                         char *msg);
 115         int (*raw2addr)(struct tipc_bearer *b,
 116                         struct tipc_media_addr *addr,
 117                         char *raw);
 118         u32 priority;
 119         u32 tolerance;
 120         u32 window;
 121         u32 type_id;
 122         u32 hwaddr_len;
 123         char name[TIPC_MAX_MEDIA_NAME];
 124 };
 125
 126 /**
 127  * struct tipc_bearer - Generic TIPC bearer structure
 128  * @media_ptr: pointer to additional media-specific information about bearer
 129  * @mtu: max packet size bearer can support
 130  * @addr: media-specific address associated with bearer
 131  * @name: bearer name (format = media:interface)
 132  * @media: ptr to media structure associated with bearer
 133  * @bcast_addr: media address used in broadcasting
 134  * @rcu: rcu struct for tipc_bearer
 135  * @priority: default link priority for bearer
 136  * @window: default window size for bearer
 137  * @tolerance: default link tolerance for bearer
 138  * @domain: network domain to which links can be established
 139  * @identity: array index of this bearer within TIPC bearer array
 140  * @link_req: ptr to (optional) structure making periodic link setup requests
 141  * @net_plane: network plane ('A' through 'H') currently associated with bearer
 142  *
 143  * Note: media-specific code is responsible for initialization of the fields
 144  * indicated below when a bearer is enabled; TIPC's generic bearer code takes
 145  * care of initializing all other fields.
 146  */
 147 struct tipc_bearer {
 148         void __rcu *media_ptr;                  /* initalized by media */
 149         u32 mtu;                                /* initalized by media */
 150         struct tipc_media_addr addr;            /* initalized by media */
 151         char name[TIPC_MAX_BEARER_NAME];
 152         struct tipc_media *media;
 153         struct tipc_media_addr bcast_addr;
 154         struct rcu_head rcu;
 155         u32 priority;
 156         u32 window;
 157         u32 tolerance;
 158         u32 domain;
 159         u32 identity;
 160         struct tipc_link_req *link_req;
 161         char net_plane;
 162         unsigned long up;
 163 };
 164
 165 struct tipc_bearer_names {
 166         char media_name[TIPC_MAX_MEDIA_NAME];
 167         char if_name[TIPC_MAX_IF_NAME];
 168 };
 169
 170 /*
 171  * TIPC routines available to supported media types
 172  */
 173
 174 void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b);
 175
 176 /*
 177  * Routines made available to TIPC by supported media types
 178  */
 179 extern struct tipc_media eth_media_info;
 180
 181 #ifdef CONFIG_TIPC_MEDIA_IB
 182 extern struct tipc_media ib_media_info;
 183 #endif
 184 #ifdef CONFIG_TIPC_MEDIA_UDP
 185 extern struct tipc_media udp_media_info;
 186 #endif
 187
 188 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
 189 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);
 190 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb);
 191 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info);
 192 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info);
 193 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info);
 194
 195 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb);
 196 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info);
 197 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info);
 198
 199 int tipc_media_set_priority(const char *name, u32 new_value);
 200 int tipc_media_set_window(const char *name, u32 new_value);
 201 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a);
 202 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 203                          struct nlattr *attrs[]);
 204 void tipc_disable_l2_media(struct tipc_bearer *b);
 205 int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
 206                      struct tipc_bearer *b, struct tipc_media_addr *dest);
 207
 208 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest);
 209 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest);
 210 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name);
 211 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id);
 212 struct tipc_media *tipc_media_find(const char *name);
 213 void tipc_bearer_reset_all(struct net *net);
 214 int tipc_bearer_setup(void);
 215 void tipc_bearer_cleanup(void);
 216 void tipc_bearer_stop(struct net *net);
 217 int tipc_bearer_mtu(struct net *net, u32 bearer_id);
 218 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id);
 219 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
 220                           struct sk_buff *skb,
 221                           struct tipc_media_addr *dest);
 222 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
 223                       struct sk_buff_head *xmitq,
 224                       struct tipc_media_addr *dst);
 225 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
 226                          struct sk_buff_head *xmitq);
 227
 228 /* check if device MTU is too low for tipc headers */
 229 static inline bool tipc_mtu_bad(struct net_device *dev, unsigned int reserve)
 230 {
 231         if (dev->mtu >= TIPC_MIN_BEARER_MTU + reserve)
 232                 return false;
 233         netdev_warn(dev, "MTU too low for tipc bearer\n");
 234         return true;
 235 }
 236
 237 #endif  /* _TIPC_BEARER_H */