LXR linux/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 */
  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 * @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 */
 103struct 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 min_win;
 123        u32 max_win;
 124        u32 mtu;
 125        u32 type_id;
 126        u32 hwaddr_len;
 127        char name[TIPC_MAX_MEDIA_NAME];
 128};
 129
 130/**
 131 * struct tipc_bearer - Generic TIPC bearer structure
 132 * @media_ptr: pointer to additional media-specific information about bearer
 133 * @mtu: max packet size bearer can support
 134 * @addr: media-specific address associated with bearer
 135 * @name: bearer name (format = media:interface)
 136 * @media: ptr to media structure associated with bearer
 137 * @bcast_addr: media address used in broadcasting
 138 * @pt: packet type for bearer
 139 * @rcu: rcu struct for tipc_bearer
 140 * @priority: default link priority for bearer
 141 * @window: default window size for bearer
 142 * @tolerance: default link tolerance for bearer
 143 * @domain: network domain to which links can be established
 144 * @identity: array index of this bearer within TIPC bearer array
 145 * @link_req: ptr to (optional) structure making periodic link setup requests
 146 * @net_plane: network plane ('A' through 'H') currently associated with bearer
 147 *
 148 * Note: media-specific code is responsible for initialization of the fields
 149 * indicated below when a bearer is enabled; TIPC's generic bearer code takes
 150 * care of initializing all other fields.
 151 */
 152struct tipc_bearer {
 153        void __rcu *media_ptr;                  /* initalized by media */
 154        u32 mtu;                                /* initalized by media */
 155        struct tipc_media_addr addr;            /* initalized by media */
 156        char name[TIPC_MAX_BEARER_NAME];
 157        struct tipc_media *media;
 158        struct tipc_media_addr bcast_addr;
 159        struct packet_type pt;
 160        struct rcu_head rcu;
 161        u32 priority;
 162        u32 min_win;
 163        u32 max_win;
 164        u32 tolerance;
 165        u32 domain;
 166        u32 identity;
 167        struct tipc_discoverer *disc;
 168        char net_plane;
 169        unsigned long up;
 170        refcount_t refcnt;
 171};
 172
 173struct tipc_bearer_names {
 174        char media_name[TIPC_MAX_MEDIA_NAME];
 175        char if_name[TIPC_MAX_IF_NAME];
 176};
 177
 178/*
 179 * TIPC routines available to supported media types
 180 */
 181
 182void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b);
 183
 184/*
 185 * Routines made available to TIPC by supported media types
 186 */
 187extern struct tipc_media eth_media_info;
 188
 189#ifdef CONFIG_TIPC_MEDIA_IB
 190extern struct tipc_media ib_media_info;
 191#endif
 192#ifdef CONFIG_TIPC_MEDIA_UDP
 193extern struct tipc_media udp_media_info;
 194#endif
 195
 196int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
 197int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
 198int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);
 199int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);
 200int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb);
 201int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info);
 202int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info);
 203int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info);
 204int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info);
 205
 206int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb);
 207int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info);
 208int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info);
 209int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info);
 210
 211int tipc_media_set_priority(const char *name, u32 new_value);
 212int tipc_media_set_window(const char *name, u32 new_value);
 213int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a);
 214int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 215                         struct nlattr *attrs[]);
 216bool tipc_bearer_hold(struct tipc_bearer *b);
 217void tipc_bearer_put(struct tipc_bearer *b);
 218void tipc_disable_l2_media(struct tipc_bearer *b);
 219int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
 220                     struct tipc_bearer *b, struct tipc_media_addr *dest);
 221
 222void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest);
 223void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest);
 224struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name);
 225int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id);
 226struct tipc_media *tipc_media_find(const char *name);
 227int tipc_bearer_setup(void);
 228void tipc_bearer_cleanup(void);
 229void tipc_bearer_stop(struct net *net);
 230int tipc_bearer_mtu(struct net *net, u32 bearer_id);
 231bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id);
 232void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
 233                          struct sk_buff *skb,
 234                          struct tipc_media_addr *dest);
 235void tipc_bearer_xmit(struct net *net, u32 bearer_id,
 236                      struct sk_buff_head *xmitq,
 237                      struct tipc_media_addr *dst,
 238                      struct tipc_node *__dnode);
 239void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
 240                         struct sk_buff_head *xmitq);
 241void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts);
 242int tipc_attach_loopback(struct net *net);
 243void tipc_detach_loopback(struct net *net);
 244
 245static inline void tipc_loopback_trace(struct net *net,
 246                                       struct sk_buff_head *pkts)
 247{
 248        if (unlikely(dev_nit_active(net->loopback_dev)))
 249                tipc_clone_to_loopback(net, pkts);
 250}
 251
 252/* check if device MTU is too low for tipc headers */
 253static inline bool tipc_mtu_bad(struct net_device *dev, unsigned int reserve)
 254{
 255        if (dev->mtu >= TIPC_MIN_BEARER_MTU + reserve)
 256                return false;
 257        netdev_warn(dev, "MTU too low for tipc bearer\n");
 258        return true;
 259}
 260
 261#endif  /* _TIPC_BEARER_H */
 262