147 lines
5.5 KiB
C
147 lines
5.5 KiB
C
/*
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* net/tipc/node.h: Include file for TIPC node management routines
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*
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* Copyright (c) 2000-2006, Ericsson AB
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* Copyright (c) 2005, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _TIPC_NODE_H
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#define _TIPC_NODE_H
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#include "node_subscr.h"
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#include "addr.h"
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#include "cluster.h"
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#include "bearer.h"
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/**
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* struct tipc_node - TIPC node structure
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* @addr: network address of node
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* @lock: spinlock governing access to structure
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* @owner: pointer to cluster that node belongs to
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* @next: pointer to next node in sorted list of cluster's nodes
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* @nsub: list of "node down" subscriptions monitoring node
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* @active_links: pointers to active links to node
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* @links: pointers to all links to node
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* @working_links: number of working links to node (both active and standby)
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* @link_cnt: number of links to node
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* @permit_changeover: non-zero if node has redundant links to this system
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* @routers: bitmap (used for multicluster communication)
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* @last_router: (used for multicluster communication)
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* @bclink: broadcast-related info
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* @supported: non-zero if node supports TIPC b'cast capability
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* @acked: sequence # of last outbound b'cast message acknowledged by node
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* @last_in: sequence # of last in-sequence b'cast message received from node
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* @gap_after: sequence # of last message not requiring a NAK request
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* @gap_to: sequence # of last message requiring a NAK request
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* @nack_sync: counter that determines when NAK requests should be sent
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* @deferred_head: oldest OOS b'cast message received from node
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* @deferred_tail: newest OOS b'cast message received from node
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* @defragm: list of partially reassembled b'cast message fragments from node
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*/
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struct tipc_node {
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u32 addr;
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spinlock_t lock;
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struct cluster *owner;
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struct tipc_node *next;
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struct list_head nsub;
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struct link *active_links[2];
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struct link *links[MAX_BEARERS];
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int link_cnt;
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int working_links;
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int permit_changeover;
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u32 routers[512/32];
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int last_router;
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struct {
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int supported;
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u32 acked;
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u32 last_in;
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u32 gap_after;
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u32 gap_to;
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u32 nack_sync;
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struct sk_buff *deferred_head;
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struct sk_buff *deferred_tail;
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struct sk_buff *defragm;
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} bclink;
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};
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extern struct tipc_node *tipc_nodes;
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extern u32 tipc_own_tag;
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struct tipc_node *tipc_node_create(u32 addr);
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void tipc_node_delete(struct tipc_node *n_ptr);
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struct tipc_node *tipc_node_attach_link(struct link *l_ptr);
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void tipc_node_detach_link(struct tipc_node *n_ptr, struct link *l_ptr);
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void tipc_node_link_down(struct tipc_node *n_ptr, struct link *l_ptr);
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void tipc_node_link_up(struct tipc_node *n_ptr, struct link *l_ptr);
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int tipc_node_has_active_links(struct tipc_node *n_ptr);
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int tipc_node_has_redundant_links(struct tipc_node *n_ptr);
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u32 tipc_node_select_router(struct tipc_node *n_ptr, u32 ref);
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struct tipc_node *tipc_node_select_next_hop(u32 addr, u32 selector);
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int tipc_node_is_up(struct tipc_node *n_ptr);
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void tipc_node_add_router(struct tipc_node *n_ptr, u32 router);
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void tipc_node_remove_router(struct tipc_node *n_ptr, u32 router);
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struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space);
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struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space);
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static inline struct tipc_node *tipc_node_find(u32 addr)
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{
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if (likely(in_own_cluster(addr)))
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return tipc_local_nodes[tipc_node(addr)];
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else if (tipc_addr_domain_valid(addr)) {
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struct cluster *c_ptr = tipc_cltr_find(addr);
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if (c_ptr)
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return c_ptr->nodes[tipc_node(addr)];
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}
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return NULL;
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}
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static inline struct tipc_node *tipc_node_select(u32 addr, u32 selector)
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{
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if (likely(in_own_cluster(addr)))
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return tipc_local_nodes[tipc_node(addr)];
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return tipc_node_select_next_hop(addr, selector);
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}
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static inline void tipc_node_lock(struct tipc_node *n_ptr)
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{
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spin_lock_bh(&n_ptr->lock);
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}
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static inline void tipc_node_unlock(struct tipc_node *n_ptr)
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{
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spin_unlock_bh(&n_ptr->lock);
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}
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#endif
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