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