net/tipc/node.h

   1 /*
   2  * net/tipc/node.h: Include file for TIPC node management routines
   3  *
   4  * Copyright (c) 2000-2006, 2014, Ericsson AB
   5  * Copyright (c) 2005, 2010-2014, 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_NODE_H
  38 #define _TIPC_NODE_H
  39
  40 #include "addr.h"
  41 #include "net.h"
  42 #include "bearer.h"
  43 #include "msg.h"
  44
  45 /* Out-of-range value for node signature */
  46 #define INVALID_NODE_SIG        0x10000
  47
  48 #define NODE_HTABLE_SIZE        512
  49
  50 /* Flags used to take different actions according to flag type
  51  * TIPC_WAIT_PEER_LINKS_DOWN: wait to see that peer's links are down
  52  * TIPC_WAIT_OWN_LINKS_DOWN: wait until peer node is declared down
  53  * TIPC_NOTIFY_NODE_DOWN: notify node is down
  54  * TIPC_NOTIFY_NODE_UP: notify node is up
  55  * TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type
  56  */
  57 enum {
  58         TIPC_MSG_EVT                    = 1,
  59         TIPC_WAIT_PEER_LINKS_DOWN       = (1 << 1),
  60         TIPC_WAIT_OWN_LINKS_DOWN        = (1 << 2),
  61         TIPC_NOTIFY_NODE_DOWN           = (1 << 3),
  62         TIPC_NOTIFY_NODE_UP             = (1 << 4),
  63         TIPC_WAKEUP_BCAST_USERS         = (1 << 5),
  64         TIPC_NOTIFY_LINK_UP             = (1 << 6),
  65         TIPC_NOTIFY_LINK_DOWN           = (1 << 7),
  66         TIPC_NAMED_MSG_EVT              = (1 << 8)
  67 };
  68
  69 /**
  70  * struct tipc_node_bclink - TIPC node bclink structure
  71  * @acked: sequence # of last outbound b'cast message acknowledged by node
  72  * @last_in: sequence # of last in-sequence b'cast message received from node
  73  * @last_sent: sequence # of last b'cast message sent by node
  74  * @oos_state: state tracker for handling OOS b'cast messages
  75  * @deferred_queue: deferred queue saved OOS b'cast message received from node
  76  * @reasm_buf: broadcast reassembly queue head from node
  77  * @recv_permitted: true if node is allowed to receive b'cast messages
  78  */
  79 struct tipc_node_bclink {
  80         u32 acked;
  81         u32 last_in;
  82         u32 last_sent;
  83         u32 oos_state;
  84         u32 deferred_size;
  85         struct sk_buff_head deferred_queue;
  86         struct sk_buff *reasm_buf;
  87         bool recv_permitted;
  88 };
  89
  90 /**
  91  * struct tipc_node - TIPC node structure
  92  * @addr: network address of node
  93  * @lock: spinlock governing access to structure
  94  * @net: the applicable net namespace
  95  * @hash: links to adjacent nodes in unsorted hash chain
  96  * @inputq: pointer to input queue containing messages for msg event
  97  * @namedq: pointer to name table input queue with name table messages
  98  * @curr_link: the link holding the node lock, if any
  99  * @active_links: pointers to active links to node
 100  * @links: pointers to all links to node
 101  * @action_flags: bit mask of different types of node actions
 102  * @bclink: broadcast-related info
 103  * @list: links to adjacent nodes in sorted list of cluster's nodes
 104  * @working_links: number of working links to node (both active and standby)
 105  * @link_cnt: number of links to node
 106  * @signature: node instance identifier
 107  * @link_id: local and remote bearer ids of changing link, if any
 108  * @publ_list: list of publications
 109  * @rcu: rcu struct for tipc_node
 110  */
 111 struct tipc_node {
 112         u32 addr;
 113         spinlock_t lock;
 114         struct net *net;
 115         struct hlist_node hash;
 116         struct sk_buff_head *inputq;
 117         struct sk_buff_head *namedq;
 118         struct tipc_link *active_links[2];
 119         u32 act_mtus[2];
 120         struct tipc_link *links[MAX_BEARERS];
 121         int action_flags;
 122         struct tipc_node_bclink bclink;
 123         struct list_head list;
 124         int link_cnt;
 125         int working_links;
 126         u32 signature;
 127         u32 link_id;
 128         struct list_head publ_list;
 129         struct list_head conn_sks;
 130         struct rcu_head rcu;
 131 };
 132
 133 struct tipc_node *tipc_node_find(struct net *net, u32 addr);
 134 struct tipc_node *tipc_node_create(struct net *net, u32 addr);
 135 void tipc_node_stop(struct net *net);
 136 void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr);
 137 void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr);
 138 void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr);
 139 void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr);
 140 int tipc_node_active_links(struct tipc_node *n_ptr);
 141 int tipc_node_is_up(struct tipc_node *n_ptr);
 142 struct sk_buff *tipc_node_get_links(struct net *net, const void *req_tlv_area,
 143                                     int req_tlv_space);
 144 struct sk_buff *tipc_node_get_nodes(struct net *net, const void *req_tlv_area,
 145                                     int req_tlv_space);
 146 int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 node,
 147                            char *linkname, size_t len);
 148 void tipc_node_unlock(struct tipc_node *node);
 149 int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port);
 150 void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port);
 151
 152 int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb);
 153
 154 static inline void tipc_node_lock(struct tipc_node *node)
 155 {
 156         spin_lock_bh(&node->lock);
 157 }
 158
 159 static inline bool tipc_node_blocked(struct tipc_node *node)
 160 {
 161         return (node->action_flags & (TIPC_WAIT_PEER_LINKS_DOWN |
 162                 TIPC_NOTIFY_NODE_DOWN | TIPC_WAIT_OWN_LINKS_DOWN));
 163 }
 164
 165 static inline uint tipc_node_get_mtu(struct net *net, u32 addr, u32 selector)
 166 {
 167         struct tipc_node *node;
 168         u32 mtu;
 169
 170         node = tipc_node_find(net, addr);
 171
 172         if (likely(node))
 173                 mtu = node->act_mtus[selector & 1];
 174         else
 175                 mtu = MAX_MSG_SIZE;
 176
 177         return mtu;
 178 }
 179
 180 #endif