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linux/net/batman-adv/main.h
Sven Eckelmann 4b426b108a batman-adv: Use bool as return type for boolean functions 
It is easier to understand that the returned value of a specific function
doesn't have to be 0 when the functions was successful when the actual
return type is bool. This is especially true when all surrounding functions
with return type int use negative values to return the error code.

Reported-by: Nicholas Krause <xerofoify@gmail.com>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
2016-05-10 18:28:54 +08:00

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/* Copyright (C) 2007-2016 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _NET_BATMAN_ADV_MAIN_H_
#define _NET_BATMAN_ADV_MAIN_H_
#define BATADV_DRIVER_AUTHOR "Marek Lindner <mareklindner@neomailbox.ch>, " \
"Simon Wunderlich <sw@simonwunderlich.de>"
#define BATADV_DRIVER_DESC "B.A.T.M.A.N. advanced"
#define BATADV_DRIVER_DEVICE "batman-adv"
#ifndef BATADV_SOURCE_VERSION
#define BATADV_SOURCE_VERSION "2016.2"
#endif
/* B.A.T.M.A.N. parameters */
#define BATADV_TQ_MAX_VALUE 255
#define BATADV_THROUGHPUT_MAX_VALUE 0xFFFFFFFF
#define BATADV_JITTER 20
/* Time To Live of broadcast messages */
#define BATADV_TTL 50
/* maximum sequence number age of broadcast messages */
#define BATADV_BCAST_MAX_AGE 64
/* purge originators after time in seconds if no valid packet comes in
* -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE
*/
#define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */
#define BATADV_TT_LOCAL_TIMEOUT 600000 /* in milliseconds */
#define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */
#define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */
#define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */
#define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */
#define BATADV_DAT_ENTRY_TIMEOUT (5 * 60000) /* 5 mins in milliseconds */
/* sliding packet range of received originator messages in sequence numbers
* (should be a multiple of our word size)
*/
#define BATADV_TQ_LOCAL_WINDOW_SIZE 64
/* milliseconds we have to keep pending tt_req */
#define BATADV_TT_REQUEST_TIMEOUT 3000
#define BATADV_TQ_GLOBAL_WINDOW_SIZE 5
#define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
#define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
#define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1
/* B.A.T.M.A.N. V */
#define BATADV_THROUGHPUT_DEFAULT_VALUE 10 /* 1 Mbps */
#define BATADV_ELP_PROBES_PER_NODE 2
#define BATADV_ELP_MIN_PROBE_SIZE 200 /* bytes */
#define BATADV_ELP_PROBE_MAX_TX_DIFF 100 /* milliseconds */
#define BATADV_ELP_MAX_AGE 64
#define BATADV_OGM_MAX_ORIGDIFF 5
#define BATADV_OGM_MAX_AGE 64
/* number of OGMs sent with the last tt diff */
#define BATADV_TT_OGM_APPEND_MAX 3
/* Time in which a client can roam at most ROAMING_MAX_COUNT times in
* milliseconds
*/
#define BATADV_ROAMING_MAX_TIME 20000
#define BATADV_ROAMING_MAX_COUNT 5
#define BATADV_NO_FLAGS 0
#define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */
#define BATADV_NO_MARK 0
/* default interface for multi interface operation. The default interface is
* used for communication which originated locally (i.e. is not forwarded)
* or where special forwarding is not desired/necessary.
*/
#define BATADV_IF_DEFAULT ((struct batadv_hard_iface *)NULL)
#define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE)
#define BATADV_LOG_BUF_LEN 8192 /* has to be a power of 2 */
/* number of packets to send for broadcasts on different interface types */
#define BATADV_NUM_BCASTS_DEFAULT 1
#define BATADV_NUM_BCASTS_WIRELESS 3
#define BATADV_NUM_BCASTS_MAX 3
/* msecs after which an ARP_REQUEST is sent in broadcast as fallback */
#define ARP_REQ_DELAY 250
/* numbers of originator to contact for any PUT/GET DHT operation */
#define BATADV_DAT_CANDIDATES_NUM 3
/* BATADV_TQ_SIMILARITY_THRESHOLD - TQ points that a secondary metric can differ
* at most from the primary one in order to be still considered acceptable
*/
#define BATADV_TQ_SIMILARITY_THRESHOLD 50
/* should not be bigger than 512 bytes or change the size of
* forw_packet->direct_link_flags
*/
#define BATADV_MAX_AGGREGATION_BYTES 512
#define BATADV_MAX_AGGREGATION_MS 100
#define BATADV_BLA_PERIOD_LENGTH 10000 /* 10 seconds */
#define BATADV_BLA_BACKBONE_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 6)
#define BATADV_BLA_CLAIM_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 10)
#define BATADV_BLA_WAIT_PERIODS 3
#define BATADV_BLA_LOOPDETECT_PERIODS 6
#define BATADV_BLA_LOOPDETECT_TIMEOUT 3000 /* 3 seconds */
#define BATADV_DUPLIST_SIZE 16
#define BATADV_DUPLIST_TIMEOUT 500 /* 500 ms */
/* don't reset again within 30 seconds */
#define BATADV_RESET_PROTECTION_MS 30000
#define BATADV_EXPECTED_SEQNO_RANGE 65536
#define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */
enum batadv_mesh_state {
BATADV_MESH_INACTIVE,
BATADV_MESH_ACTIVE,
BATADV_MESH_DEACTIVATING,
};
#define BATADV_BCAST_QUEUE_LEN 256
#define BATADV_BATMAN_QUEUE_LEN 256
enum batadv_uev_action {
BATADV_UEV_ADD = 0,
BATADV_UEV_DEL,
BATADV_UEV_CHANGE,
BATADV_UEV_LOOPDETECT,
};
enum batadv_uev_type {
BATADV_UEV_GW = 0,
BATADV_UEV_BLA,
};
#define BATADV_GW_THRESHOLD 50
/* Number of fragment chains for each orig_node */
#define BATADV_FRAG_BUFFER_COUNT 8
/* Maximum number of fragments for one packet */
#define BATADV_FRAG_MAX_FRAGMENTS 16
/* Maxumim size of each fragment */
#define BATADV_FRAG_MAX_FRAG_SIZE 1400
/* Time to keep fragments while waiting for rest of the fragments */
#define BATADV_FRAG_TIMEOUT 10000
#define BATADV_DAT_CANDIDATE_NOT_FOUND 0
#define BATADV_DAT_CANDIDATE_ORIG 1
/* Debug Messages */
#ifdef pr_fmt
#undef pr_fmt
#endif
/* Append 'batman-adv: ' before kernel messages */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
/* Kernel headers */
#include <linux/atomic.h>
#include <linux/bitops.h> /* for packet.h */
#include <linux/compiler.h>
#include <linux/cpumask.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h> /* for packet.h */
#include <linux/netdevice.h>
#include <linux/printk.h>
#include <linux/types.h>
#include <linux/percpu.h>
#include <linux/jiffies.h>
#include <linux/if_vlan.h>
#include "types.h"
struct batadv_ogm_packet;
struct seq_file;
struct sk_buff;
#define BATADV_PRINT_VID(vid) ((vid & BATADV_VLAN_HAS_TAG) ? \
(int)(vid & VLAN_VID_MASK) : -1)
extern char batadv_routing_algo[];
extern struct list_head batadv_hardif_list;
extern unsigned char batadv_broadcast_addr[];
extern struct workqueue_struct *batadv_event_workqueue;
int batadv_mesh_init(struct net_device *soft_iface);
void batadv_mesh_free(struct net_device *soft_iface);
bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr);
struct batadv_hard_iface *
batadv_seq_print_text_primary_if_get(struct seq_file *seq);
int batadv_max_header_len(void);
void batadv_skb_set_priority(struct sk_buff *skb, int offset);
int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype,
struct net_device *orig_dev);
int
batadv_recv_handler_register(u8 packet_type,
int (*recv_handler)(struct sk_buff *,
struct batadv_hard_iface *));
void batadv_recv_handler_unregister(u8 packet_type);
int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops);
int batadv_algo_select(struct batadv_priv *bat_priv, char *name);
int batadv_algo_seq_print_text(struct seq_file *seq, void *offset);
__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);
/**
* enum batadv_dbg_level - available log levels
* @BATADV_DBG_BATMAN: OGM and TQ computations related messages
* @BATADV_DBG_ROUTES: route added / changed / deleted
* @BATADV_DBG_TT: translation table messages
* @BATADV_DBG_BLA: bridge loop avoidance messages
* @BATADV_DBG_DAT: ARP snooping and DAT related messages
* @BATADV_DBG_NC: network coding related messages
* @BATADV_DBG_ALL: the union of all the above log levels
*/
enum batadv_dbg_level {
BATADV_DBG_BATMAN = BIT(0),
BATADV_DBG_ROUTES = BIT(1),
BATADV_DBG_TT = BIT(2),
BATADV_DBG_BLA = BIT(3),
BATADV_DBG_DAT = BIT(4),
BATADV_DBG_NC = BIT(5),
BATADV_DBG_ALL = 63,
};
#ifdef CONFIG_BATMAN_ADV_DEBUG
int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
__printf(2, 3);
/* possibly ratelimited debug output */
#define _batadv_dbg(type, bat_priv, ratelimited, fmt, arg...) \
do { \
if (atomic_read(&bat_priv->log_level) & type && \
(!ratelimited || net_ratelimit())) \
batadv_debug_log(bat_priv, fmt, ## arg);\
} \
while (0)
#else /* !CONFIG_BATMAN_ADV_DEBUG */
__printf(4, 5)
static inline void _batadv_dbg(int type __always_unused,
struct batadv_priv *bat_priv __always_unused,
int ratelimited __always_unused,
const char *fmt __always_unused, ...)
{
}
#endif
#define batadv_dbg(type, bat_priv, arg...) \
_batadv_dbg(type, bat_priv, 0, ## arg)
#define batadv_dbg_ratelimited(type, bat_priv, arg...) \
_batadv_dbg(type, bat_priv, 1, ## arg)
#define batadv_info(net_dev, fmt, arg...) \
do { \
struct net_device *_netdev = (net_dev); \
struct batadv_priv *_batpriv = netdev_priv(_netdev); \
batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg); \
pr_info("%s: " fmt, _netdev->name, ## arg); \
} while (0)
#define batadv_err(net_dev, fmt, arg...) \
do { \
struct net_device *_netdev = (net_dev); \
struct batadv_priv *_batpriv = netdev_priv(_netdev); \
batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg); \
pr_err("%s: " fmt, _netdev->name, ## arg); \
} while (0)
/**
* batadv_compare_eth - Compare two not u16 aligned Ethernet addresses
* @data1: Pointer to a six-byte array containing the Ethernet address
* @data2: Pointer other six-byte array containing the Ethernet address
*
* note: can't use ether_addr_equal() as it requires aligned memory
*
* Return: true if they are the same ethernet addr
*/
static inline bool batadv_compare_eth(const void *data1, const void *data2)
{
return ether_addr_equal_unaligned(data1, data2);
}
/**
* batadv_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)
*
* Return: true if current time is after timestamp + timeout
*/
static inline bool batadv_has_timed_out(unsigned long timestamp,
unsigned int timeout)
{
return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
}
#define batadv_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 batadv_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 u8 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 batadv_seq_before(x, y) ({typeof(x)_d1 = (x); \
typeof(y)_d2 = (y); \
typeof(x)_dummy = (_d1 - _d2); \
(void)(&_d1 == &_d2); \
_dummy > batadv_smallest_signed_int(_dummy); })
#define batadv_seq_after(x, y) batadv_seq_before(y, x)
/* Stop preemption on local cpu while incrementing the counter */
static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx,
size_t count)
{
this_cpu_add(bat_priv->bat_counters[idx], count);
}
#define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)
/**
* batadv_sum_counter - Sum the cpu-local counters for index 'idx'
* @bat_priv: the bat priv with all the soft interface information
* @idx: index of counter to sum up
*
* Return: sum of all cpu-local counters
*/
static inline u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx)
{
u64 *counters, sum = 0;
int cpu;
for_each_possible_cpu(cpu) {
counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
sum += counters[idx];
}
return sum;
}
/* Define a macro to reach the control buffer of the skb. The members of the
* control buffer are defined in struct batadv_skb_cb in types.h.
* The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h.
*/
#define BATADV_SKB_CB(__skb) ((struct batadv_skb_cb *)&((__skb)->cb[0]))
void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
u8 type, u8 version,
void *tvlv_value, u16 tvlv_value_len);
u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len, int packet_min_len);
void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
struct batadv_ogm_packet *batadv_ogm_packet,
struct batadv_orig_node *orig_node);
void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
u8 type, u8 version);
void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
void (*optr)(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
u8 flags,
void *tvlv_value,
u16 tvlv_value_len),
int (*uptr)(struct batadv_priv *bat_priv,
u8 *src, u8 *dst,
void *tvlv_value,
u16 tvlv_value_len),
u8 type, u8 version, u8 flags);
void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
u8 type, u8 version);
int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
bool ogm_source,
struct batadv_orig_node *orig_node,
u8 *src, u8 *dst,
void *tvlv_buff, u16 tvlv_buff_len);
void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src,
u8 *dst, u8 type, u8 version,
void *tvlv_value, u16 tvlv_value_len);
unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len);
bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid);
#endif /* _NET_BATMAN_ADV_MAIN_H_ */
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