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/*
* net/tipc/monitor.c
*
* Copyright (c) 2016, Ericsson AB
* 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.
*/
#include <net/genetlink.h>
#include "core.h"
#include "addr.h"
#include "monitor.h"
#include "bearer.h"
#define MAX_MON_DOMAIN 64
#define MON_TIMEOUT 120000
#define MAX_PEER_DOWN_EVENTS 4
/* struct tipc_mon_domain: domain record to be transferred between peers
* @len: actual size of domain record
* @gen: current generation of sender's domain
* @ack_gen: most recent generation of self's domain acked by peer
* @member_cnt: number of domain member nodes described in this record
* @up_map: bit map indicating which of the members the sender considers up
* @members: identity of the domain members
*/
struct tipc_mon_domain {
u16 len;
u16 gen;
u16 ack_gen;
u16 member_cnt;
u64 up_map;
u32 members[MAX_MON_DOMAIN];
};
/* struct tipc_peer: state of a peer node and its domain
* @addr: tipc node identity of peer
* @head_map: shows which other nodes currently consider peer 'up'
* @domain: most recent domain record from peer
* @hash: position in hashed lookup list
* @list: position in linked list, in circular ascending order by 'addr'
* @applied: number of reported domain members applied on this monitor list
* @is_up: peer is up as seen from this node
* @is_head: peer is assigned domain head as seen from this node
* @is_local: peer is in local domain and should be continuously monitored
* @down_cnt: - numbers of other peers which have reported this on lost
*/
struct tipc_peer {
u32 addr;
struct tipc_mon_domain *domain;
struct hlist_node hash;
struct list_head list;
u8 applied;
u8 down_cnt;
bool is_up;
bool is_head;
bool is_local;
};
struct tipc_monitor {
struct hlist_head peers[NODE_HTABLE_SIZE];
int peer_cnt;
struct tipc_peer *self;
rwlock_t lock;
struct tipc_mon_domain cache;
u16 list_gen;
u16 dom_gen;
struct net *net;
struct timer_list timer;
unsigned long timer_intv;
};
static struct tipc_monitor *tipc_monitor(struct net *net, int bearer_id)
{
return tipc_net(net)->monitors[bearer_id];
}
const int tipc_max_domain_size = sizeof(struct tipc_mon_domain);
/* dom_rec_len(): actual length of domain record for transport
*/
static int dom_rec_len(struct tipc_mon_domain *dom, u16 mcnt)
{
return ((void *)&dom->members - (void *)dom) + (mcnt * sizeof(u32));
}
/* dom_size() : calculate size of own domain based on number of peers
*/
static int dom_size(int peers)
{
int i = 0;
while ((i * i) < peers)
i++;
return i < MAX_MON_DOMAIN ? i : MAX_MON_DOMAIN;
}
static void map_set(u64 *up_map, int i, unsigned int v)
{
*up_map &= ~(1ULL << i);
*up_map |= ((u64)v << i);
}
static int map_get(u64 up_map, int i)
{
return (up_map & (1 << i)) >> i;
}
static struct tipc_peer *peer_prev(struct tipc_peer *peer)
{
return list_last_entry(&peer->list, struct tipc_peer, list);
}
static struct tipc_peer *peer_nxt(struct tipc_peer *peer)
{
return list_first_entry(&peer->list, struct tipc_peer, list);
}
static struct tipc_peer *peer_head(struct tipc_peer *peer)
{
while (!peer->is_head)
peer = peer_prev(peer);
return peer;
}
static struct tipc_peer *get_peer(struct tipc_monitor *mon, u32 addr)
{
struct tipc_peer *peer;
unsigned int thash = tipc_hashfn(addr);
hlist_for_each_entry(peer, &mon->peers[thash], hash) {
if (peer->addr == addr)
return peer;
}
return NULL;
}
static struct tipc_peer *get_self(struct net *net, int bearer_id)
{
struct tipc_monitor *mon = tipc_monitor(net, bearer_id);
return mon->self;
}
static inline bool tipc_mon_is_active(struct net *net, struct tipc_monitor *mon)
{
struct tipc_net *tn = tipc_net(net);
return mon->peer_cnt > tn->mon_threshold;
}
/* mon_identify_lost_members() : - identify amd mark potentially lost members
*/
static void mon_identify_lost_members(struct tipc_peer *peer,
struct tipc_mon_domain *dom_bef,
int applied_bef)
{
struct tipc_peer *member = peer;
struct tipc_mon_domain *dom_aft = peer->domain;
int applied_aft = peer->applied;
int i;
for (i = 0; i < applied_bef; i++) {
member = peer_nxt(member);
/* Do nothing if self or peer already see member as down */
if (!member->is_up || !map_get(dom_bef->up_map, i))
continue;
/* Loss of local node must be detected by active probing */
if (member->is_local)
continue;
/* Start probing if member was removed from applied domain */
if (!applied_aft || (applied_aft < i)) {
member->down_cnt = 1;
continue;
}
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