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linux/net/tipc/node.h
Allan Stephens 5a68d5ee00 tipc: Prevent missing name table entries when link flip-flops rapidly 
Ensure that TIPC does not re-establish communication with a
neighboring node until it has finished updating all data structures
containing information about that node to reflect the earlier loss of
contact.  Previously, it was possible for TIPC to perform its purge of
name table entries relating to the node once contact had already been
re-established, resulting in the unwanted removal of valid name table
entries.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-08-17 17:32:00 -07:00

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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 tipc_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)
* @cleanup_required: non-zero if cleaning up after a prior loss of contact
* @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 tipc_node {
u32 addr;
spinlock_t lock;
struct cluster *owner;
struct tipc_node *next;
struct list_head nsub;
struct link *active_links[2];
struct link *links[MAX_BEARERS];
int link_cnt;
int working_links;
int cleanup_required;
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 tipc_node *tipc_nodes;
extern u32 tipc_own_tag;
struct tipc_node *tipc_node_create(u32 addr);
void tipc_node_delete(struct tipc_node *n_ptr);
struct tipc_node *tipc_node_attach_link(struct link *l_ptr);
void tipc_node_detach_link(struct tipc_node *n_ptr, struct link *l_ptr);
void tipc_node_link_down(struct tipc_node *n_ptr, struct link *l_ptr);
void tipc_node_link_up(struct tipc_node *n_ptr, struct link *l_ptr);
int tipc_node_has_active_links(struct tipc_node *n_ptr);
int tipc_node_has_redundant_links(struct tipc_node *n_ptr);
u32 tipc_node_select_router(struct tipc_node *n_ptr, u32 ref);
struct tipc_node *tipc_node_select_next_hop(u32 addr, u32 selector);
int tipc_node_is_up(struct tipc_node *n_ptr);
void tipc_node_add_router(struct tipc_node *n_ptr, u32 router);
void tipc_node_remove_router(struct tipc_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 tipc_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 tipc_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 tipc_node *n_ptr)
{
spin_lock_bh(&n_ptr->lock);
}
static inline void tipc_node_unlock(struct tipc_node *n_ptr)
{
spin_unlock_bh(&n_ptr->lock);
}
#endif
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