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linux-kernel-test/net/batman-adv/main.h
Simon Wunderlich fe2da6ff27 batman-adv: add broadcast duplicate check 
When multiple backbone gateways relay the same broadcast from the
backbone into the mesh, other nodes in the mesh may receive this
broadcast multiple times. To avoid this, the crc checksums of
received broadcasts are recorded and new broadcast packets with
the same content may be dropped if received by another gateway.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2012-04-11 14:28:59 +02:00

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/*
* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*
*/
#ifndef _NET_BATMAN_ADV_MAIN_H_
#define _NET_BATMAN_ADV_MAIN_H_
#define DRIVER_AUTHOR "Marek Lindner <lindner_marek@yahoo.de>, " \
"Simon Wunderlich <siwu@hrz.tu-chemnitz.de>"
#define DRIVER_DESC "B.A.T.M.A.N. advanced"
#define DRIVER_DEVICE "batman-adv"
#ifndef SOURCE_VERSION
#define SOURCE_VERSION "2012.1.0"
#endif
/* B.A.T.M.A.N. parameters */
#define TQ_MAX_VALUE 255
#define JITTER 20
/* Time To Live of broadcast messages */
#define TTL 50
/* purge originators after time in seconds if no valid packet comes in
* -> TODO: check influence on TQ_LOCAL_WINDOW_SIZE */
#define PURGE_TIMEOUT 200000 /* 200 seconds */
#define TT_LOCAL_TIMEOUT 3600000 /* in miliseconds */
#define TT_CLIENT_ROAM_TIMEOUT 600000 /* in miliseconds */
/* sliding packet range of received originator messages in sequence numbers
* (should be a multiple of our word size) */
#define TQ_LOCAL_WINDOW_SIZE 64
#define TT_REQUEST_TIMEOUT 3000 /* miliseconds we have to keep
* pending tt_req */
#define TQ_GLOBAL_WINDOW_SIZE 5
#define TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
#define TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
#define TQ_TOTAL_BIDRECT_LIMIT 1
#define TT_OGM_APPEND_MAX 3 /* number of OGMs sent with the last tt diff */
#define ROAMING_MAX_TIME 20000 /* Time in which a client can roam at most
* ROAMING_MAX_COUNT times in miliseconds*/
#define ROAMING_MAX_COUNT 5
#define NO_FLAGS 0
#define NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */
#define NUM_WORDS BITS_TO_LONGS(TQ_LOCAL_WINDOW_SIZE)
#define LOG_BUF_LEN 8192 /* has to be a power of 2 */
#define VIS_INTERVAL 5000 /* 5 seconds */
/* how much worse secondary interfaces may be to be considered as bonding
* candidates */
#define BONDING_TQ_THRESHOLD 50
/* should not be bigger than 512 bytes or change the size of
* forw_packet->direct_link_flags */
#define MAX_AGGREGATION_BYTES 512
#define MAX_AGGREGATION_MS 100
#define BLA_PERIOD_LENGTH 10000 /* 10 seconds */
#define BLA_BACKBONE_TIMEOUT (BLA_PERIOD_LENGTH * 3)
#define BLA_CLAIM_TIMEOUT (BLA_PERIOD_LENGTH * 10)
#define DUPLIST_SIZE 16
#define DUPLIST_TIMEOUT 500 /* 500 ms */
/* don't reset again within 30 seconds */
#define RESET_PROTECTION_MS 30000
#define EXPECTED_SEQNO_RANGE 65536
enum mesh_state {
MESH_INACTIVE,
MESH_ACTIVE,
MESH_DEACTIVATING
};
#define BCAST_QUEUE_LEN 256
#define BATMAN_QUEUE_LEN 256
enum uev_action {
UEV_ADD = 0,
UEV_DEL,
UEV_CHANGE
};
enum uev_type {
UEV_GW = 0
};
#define GW_THRESHOLD 50
/* Debug Messages */
#ifdef pr_fmt
#undef pr_fmt
#endif
/* Append 'batman-adv: ' before kernel messages */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
/* all messages related to routing / flooding / broadcasting / etc */
enum dbg_level {
DBG_BATMAN = 1 << 0,
DBG_ROUTES = 1 << 1, /* route added / changed / deleted */
DBG_TT = 1 << 2, /* translation table operations */
DBG_BLA = 1 << 3, /* bridge loop avoidance */
DBG_ALL = 15
};
/* Kernel headers */
#include <linux/mutex.h> /* mutex */
#include <linux/module.h> /* needed by all modules */
#include <linux/netdevice.h> /* netdevice */
#include <linux/etherdevice.h> /* ethernet address classification */
#include <linux/if_ether.h> /* ethernet header */
#include <linux/poll.h> /* poll_table */
#include <linux/kthread.h> /* kernel threads */
#include <linux/pkt_sched.h> /* schedule types */
#include <linux/workqueue.h> /* workqueue */
#include <linux/slab.h>
#include <net/sock.h> /* struct sock */
#include <linux/jiffies.h>
#include <linux/seq_file.h>
#include "types.h"
extern char bat_routing_algo[];
extern struct list_head hardif_list;
extern unsigned char broadcast_addr[];
extern struct workqueue_struct *bat_event_workqueue;
int mesh_init(struct net_device *soft_iface);
void mesh_free(struct net_device *soft_iface);
void inc_module_count(void);
void dec_module_count(void);
int is_my_mac(const uint8_t *addr);
int bat_algo_register(struct bat_algo_ops *bat_algo_ops);
int bat_algo_select(struct bat_priv *bat_priv, char *name);
int bat_algo_seq_print_text(struct seq_file *seq, void *offset);
#ifdef CONFIG_BATMAN_ADV_DEBUG
int debug_log(struct bat_priv *bat_priv, const char *fmt, ...) __printf(2, 3);
#define bat_dbg(type, bat_priv, fmt, arg...) \
do { \
if (atomic_read(&bat_priv->log_level) & type) \
debug_log(bat_priv, fmt, ## arg); \
} \
while (0)
#else /* !CONFIG_BATMAN_ADV_DEBUG */
__printf(3, 4)
static inline void bat_dbg(int type __always_unused,
struct bat_priv *bat_priv __always_unused,
const char *fmt __always_unused, ...)
{
}
#endif
#define bat_info(net_dev, fmt, arg...) \
do { \
struct net_device *_netdev = (net_dev); \
struct bat_priv *_batpriv = netdev_priv(_netdev); \
bat_dbg(DBG_ALL, _batpriv, fmt, ## arg); \
pr_info("%s: " fmt, _netdev->name, ## arg); \
} while (0)
#define bat_err(net_dev, fmt, arg...) \
do { \
struct net_device *_netdev = (net_dev); \
struct bat_priv *_batpriv = netdev_priv(_netdev); \
bat_dbg(DBG_ALL, _batpriv, fmt, ## arg); \
pr_err("%s: " fmt, _netdev->name, ## arg); \
} while (0)
/**
* returns 1 if they are the same ethernet addr
*
* note: can't use compare_ether_addr() as it requires aligned memory
*/
static inline int compare_eth(const void *data1, const void *data2)
{
return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}
/**
* has_timed_out - compares current time (jiffies) and timestamp + timeout
* @timestamp: base value to compare with (in jiffies)
* @timeout: added to base value before comparing (in milliseconds)
*
* Returns true if current time is after timestamp + timeout
*/
static inline bool has_timed_out(unsigned long timestamp, unsigned int timeout)
{
return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
}
#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
/* Returns the smallest signed integer in two's complement with the sizeof x */
#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
/* Checks if a sequence number x is a predecessor/successor of y.
* they handle overflows/underflows and can correctly check for a
* predecessor/successor unless the variable sequence number has grown by
* more then 2**(bitwidth(x)-1)-1.
* This means that for a uint8_t with the maximum value 255, it would think:
* - when adding nothing - it is neither a predecessor nor a successor
* - before adding more than 127 to the starting value - it is a predecessor,
* - when adding 128 - it is neither a predecessor nor a successor,
* - after adding more than 127 to the starting value - it is a successor */
#define seq_before(x, y) ({typeof(x) _d1 = (x); \
typeof(y) _d2 = (y); \
typeof(x) _dummy = (_d1 - _d2); \
(void) (&_d1 == &_d2); \
_dummy > smallest_signed_int(_dummy); })
#define seq_after(x, y) seq_before(y, x)
#endif /* _NET_BATMAN_ADV_MAIN_H_ */
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