1 /* 2 * net/tipc/node.h: Include file for TIPC node management routines 3 * 4 * Copyright (c) 2000-2006, Ericsson AB 5 * Copyright (c) 2005, 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 "node_subscr.h" 41 #include "addr.h" 42 #include "cluster.h" 43 #include "bearer.h" 44 45 /** 46 * struct tipc_node - TIPC node structure 47 * @addr: network address of node 48 * @lock: spinlock governing access to structure 49 * @owner: pointer to cluster that node belongs to 50 * @next: pointer to next node in sorted list of cluster's nodes 51 * @nsub: list of "node down" subscriptions monitoring node 52 * @active_links: pointers to active links to node 53 * @links: pointers to all links to node 54 * @working_links: number of working links to node (both active and standby) 55 * @link_cnt: number of links to node 56 * @permit_changeover: non-zero if node has redundant links to this system 57 * @routers: bitmap (used for multicluster communication) 58 * @last_router: (used for multicluster communication) 59 * @bclink: broadcast-related info 60 * @supported: non-zero if node supports TIPC b'cast capability 61 * @acked: sequence # of last outbound b'cast message acknowledged by node 62 * @last_in: sequence # of last in-sequence b'cast message received from node 63 * @gap_after: sequence # of last message not requiring a NAK request 64 * @gap_to: sequence # of last message requiring a NAK request 65 * @nack_sync: counter that determines when NAK requests should be sent 66 * @deferred_head: oldest OOS b'cast message received from node 67 * @deferred_tail: newest OOS b'cast message received from node 68 * @defragm: list of partially reassembled b'cast message fragments from node 69 */ 70 71 struct tipc_node { 72 u32 addr; 73 spinlock_t lock; 74 struct cluster *owner; 75 struct tipc_node *next; 76 struct list_head nsub; 77 struct link *active_links[2]; 78 struct link *links[MAX_BEARERS]; 79 int link_cnt; 80 int working_links; 81 int permit_changeover; 82 u32 routers[512/32]; 83 int last_router; 84 struct { 85 int supported; 86 u32 acked; 87 u32 last_in; 88 u32 gap_after; 89 u32 gap_to; 90 u32 nack_sync; 91 struct sk_buff *deferred_head; 92 struct sk_buff *deferred_tail; 93 struct sk_buff *defragm; 94 } bclink; 95 }; 96 97 extern struct tipc_node *tipc_nodes; 98 extern u32 tipc_own_tag; 99 100 struct tipc_node *tipc_node_create(u32 addr); 101 void tipc_node_delete(struct tipc_node *n_ptr); 102 struct tipc_node *tipc_node_attach_link(struct link *l_ptr); 103 void tipc_node_detach_link(struct tipc_node *n_ptr, struct link *l_ptr); 104 void tipc_node_link_down(struct tipc_node *n_ptr, struct link *l_ptr); 105 void tipc_node_link_up(struct tipc_node *n_ptr, struct link *l_ptr); 106 int tipc_node_has_active_links(struct tipc_node *n_ptr); 107 int tipc_node_has_redundant_links(struct tipc_node *n_ptr); 108 u32 tipc_node_select_router(struct tipc_node *n_ptr, u32 ref); 109 struct tipc_node *tipc_node_select_next_hop(u32 addr, u32 selector); 110 int tipc_node_is_up(struct tipc_node *n_ptr); 111 void tipc_node_add_router(struct tipc_node *n_ptr, u32 router); 112 void tipc_node_remove_router(struct tipc_node *n_ptr, u32 router); 113 struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space); 114 struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space); 115 116 static inline struct tipc_node *tipc_node_find(u32 addr) 117 { 118 if (likely(in_own_cluster(addr))) 119 return tipc_local_nodes[tipc_node(addr)]; 120 else if (tipc_addr_domain_valid(addr)) { 121 struct cluster *c_ptr = tipc_cltr_find(addr); 122 123 if (c_ptr) 124 return c_ptr->nodes[tipc_node(addr)]; 125 } 126 return NULL; 127 } 128 129 static inline struct tipc_node *tipc_node_select(u32 addr, u32 selector) 130 { 131 if (likely(in_own_cluster(addr))) 132 return tipc_local_nodes[tipc_node(addr)]; 133 return tipc_node_select_next_hop(addr, selector); 134 } 135 136 static inline void tipc_node_lock(struct tipc_node *n_ptr) 137 { 138 spin_lock_bh(&n_ptr->lock); 139 } 140 141 static inline void tipc_node_unlock(struct tipc_node *n_ptr) 142 { 143 spin_unlock_bh(&n_ptr->lock); 144 } 145 146 #endif 147