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 const 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 * @encap_hlen: encap headers length 150 * @up: bearer up flag (bit 0) 151 * @refcnt: tipc_bearer reference counter 152 * 153 * Note: media-specific code is responsible for initialization of the fields 154 * indicated below when a bearer is enabled; TIPC's generic bearer code takes 155 * care of initializing all other fields. 156 */ 157struct tipc_bearer { 158 void __rcu *media_ptr; /* initialized by media */ 159 u32 mtu; /* initialized by media */ 160 struct tipc_media_addr addr; /* initialized by media */ 161 char name[TIPC_MAX_BEARER_NAME]; 162 struct tipc_media *media; 163 struct tipc_media_addr bcast_addr; 164 struct packet_type pt; 165 struct rcu_head rcu; 166 u32 priority; 167 u32 min_win; 168 u32 max_win; 169 u32 tolerance; 170 u32 domain; 171 u32 identity; 172 struct tipc_discoverer *disc; 173 char net_plane; 174 u16 encap_hlen; 175 unsigned long up; 176 refcount_t refcnt; 177}; 178 179struct tipc_bearer_names { 180 char media_name[TIPC_MAX_MEDIA_NAME]; 181 char if_name[TIPC_MAX_IF_NAME]; 182}; 183 184/* 185 * TIPC routines available to supported media types 186 */ 187 188void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b); 189 190/* 191 * Routines made available to TIPC by supported media types 192 */ 193extern struct tipc_media eth_media_info; 194 195#ifdef CONFIG_TIPC_MEDIA_IB 196extern struct tipc_media ib_media_info; 197#endif 198#ifdef CONFIG_TIPC_MEDIA_UDP 199extern struct tipc_media udp_media_info; 200#endif 201 202int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info); 203int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info); 204int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info); 205int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info); 206int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb); 207int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info); 208int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info); 209int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info); 210int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info); 211 212int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb); 213int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info); 214int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info); 215int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info); 216 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); 235int tipc_bearer_min_mtu(struct net *net, u32 bearer_id); 236bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id); 237void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, 238 struct sk_buff *skb, 239 struct tipc_media_addr *dest); 240void tipc_bearer_xmit(struct net *net, u32 bearer_id, 241 struct sk_buff_head *xmitq, 242 struct tipc_media_addr *dst, 243 struct tipc_node *__dnode); 244void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, 245 struct sk_buff_head *xmitq); 246void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts); 247int tipc_attach_loopback(struct net *net); 248void tipc_detach_loopback(struct net *net); 249 250static inline void tipc_loopback_trace(struct net *net, 251 struct sk_buff_head *pkts) 252{ 253 if (unlikely(dev_nit_active(net->loopback_dev))) 254 tipc_clone_to_loopback(net, pkts); 255} 256 257/* check if device MTU is too low for tipc headers */ 258static inline bool tipc_mtu_bad(struct net_device *dev) 259{ 260 if (dev->mtu >= TIPC_MIN_BEARER_MTU) 261 return false; 262 netdev_warn(dev, "MTU too low for tipc bearer\n"); 263 return true; 264} 265 266#endif /* _TIPC_BEARER_H */ 267