linux/net/batman-adv/main.h
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   1/* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
   2 *
   3 * Marek Lindner, Simon Wunderlich
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of version 2 of the GNU General Public
   7 * License as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful, but
  10 * WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12 * General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17 * 02110-1301, USA
  18 */
  19
  20#ifndef _NET_BATMAN_ADV_MAIN_H_
  21#define _NET_BATMAN_ADV_MAIN_H_
  22
  23#define BATADV_DRIVER_AUTHOR "Marek Lindner <lindner_marek@yahoo.de>, " \
  24                             "Simon Wunderlich <siwu@hrz.tu-chemnitz.de>"
  25#define BATADV_DRIVER_DESC   "B.A.T.M.A.N. advanced"
  26#define BATADV_DRIVER_DEVICE "batman-adv"
  27
  28#ifndef BATADV_SOURCE_VERSION
  29#define BATADV_SOURCE_VERSION "2012.4.0"
  30#endif
  31
  32/* B.A.T.M.A.N. parameters */
  33
  34#define BATADV_TQ_MAX_VALUE 255
  35#define BATADV_JITTER 20
  36
  37/* Time To Live of broadcast messages */
  38#define BATADV_TTL 50
  39
  40/* purge originators after time in seconds if no valid packet comes in
  41 * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE
  42 */
  43#define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */
  44#define BATADV_TT_LOCAL_TIMEOUT 3600000 /* in milliseconds */
  45#define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */
  46#define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */
  47/* sliding packet range of received originator messages in sequence numbers
  48 * (should be a multiple of our word size)
  49 */
  50#define BATADV_TQ_LOCAL_WINDOW_SIZE 64
  51/* milliseconds we have to keep pending tt_req */
  52#define BATADV_TT_REQUEST_TIMEOUT 3000
  53
  54#define BATADV_TQ_GLOBAL_WINDOW_SIZE 5
  55#define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
  56#define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
  57#define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1
  58
  59/* number of OGMs sent with the last tt diff */
  60#define BATADV_TT_OGM_APPEND_MAX 3
  61
  62/* Time in which a client can roam at most ROAMING_MAX_COUNT times in
  63 * milliseconds
  64 */
  65#define BATADV_ROAMING_MAX_TIME 20000
  66#define BATADV_ROAMING_MAX_COUNT 5
  67
  68#define BATADV_NO_FLAGS 0
  69
  70#define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */
  71
  72#define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE)
  73
  74#define BATADV_LOG_BUF_LEN 8192   /* has to be a power of 2 */
  75
  76#define BATADV_VIS_INTERVAL 5000        /* 5 seconds */
  77
  78/* how much worse secondary interfaces may be to be considered as bonding
  79 * candidates
  80 */
  81#define BATADV_BONDING_TQ_THRESHOLD     50
  82
  83/* should not be bigger than 512 bytes or change the size of
  84 * forw_packet->direct_link_flags
  85 */
  86#define BATADV_MAX_AGGREGATION_BYTES 512
  87#define BATADV_MAX_AGGREGATION_MS 100
  88
  89#define BATADV_BLA_PERIOD_LENGTH        10000   /* 10 seconds */
  90#define BATADV_BLA_BACKBONE_TIMEOUT     (BATADV_BLA_PERIOD_LENGTH * 3)
  91#define BATADV_BLA_CLAIM_TIMEOUT        (BATADV_BLA_PERIOD_LENGTH * 10)
  92
  93#define BATADV_DUPLIST_SIZE             16
  94#define BATADV_DUPLIST_TIMEOUT          500     /* 500 ms */
  95/* don't reset again within 30 seconds */
  96#define BATADV_RESET_PROTECTION_MS 30000
  97#define BATADV_EXPECTED_SEQNO_RANGE     65536
  98
  99enum batadv_mesh_state {
 100        BATADV_MESH_INACTIVE,
 101        BATADV_MESH_ACTIVE,
 102        BATADV_MESH_DEACTIVATING,
 103};
 104
 105#define BATADV_BCAST_QUEUE_LEN          256
 106#define BATADV_BATMAN_QUEUE_LEN 256
 107
 108enum batadv_uev_action {
 109        BATADV_UEV_ADD = 0,
 110        BATADV_UEV_DEL,
 111        BATADV_UEV_CHANGE,
 112};
 113
 114enum batadv_uev_type {
 115        BATADV_UEV_GW = 0,
 116};
 117
 118#define BATADV_GW_THRESHOLD     50
 119
 120/* Debug Messages */
 121#ifdef pr_fmt
 122#undef pr_fmt
 123#endif
 124/* Append 'batman-adv: ' before kernel messages */
 125#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 126
 127/* Kernel headers */
 128
 129#include <linux/mutex.h>        /* mutex */
 130#include <linux/module.h>       /* needed by all modules */
 131#include <linux/netdevice.h>    /* netdevice */
 132#include <linux/etherdevice.h>  /* ethernet address classification */
 133#include <linux/if_ether.h>     /* ethernet header */
 134#include <linux/poll.h>         /* poll_table */
 135#include <linux/kthread.h>      /* kernel threads */
 136#include <linux/pkt_sched.h>    /* schedule types */
 137#include <linux/workqueue.h>    /* workqueue */
 138#include <linux/percpu.h>
 139#include <linux/slab.h>
 140#include <net/sock.h>           /* struct sock */
 141#include <linux/jiffies.h>
 142#include <linux/seq_file.h>
 143#include "types.h"
 144
 145extern char batadv_routing_algo[];
 146extern struct list_head batadv_hardif_list;
 147
 148extern unsigned char batadv_broadcast_addr[];
 149extern struct workqueue_struct *batadv_event_workqueue;
 150
 151int batadv_mesh_init(struct net_device *soft_iface);
 152void batadv_mesh_free(struct net_device *soft_iface);
 153void batadv_inc_module_count(void);
 154void batadv_dec_module_count(void);
 155int batadv_is_my_mac(const uint8_t *addr);
 156int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 157                           struct packet_type *ptype,
 158                           struct net_device *orig_dev);
 159int
 160batadv_recv_handler_register(uint8_t packet_type,
 161                             int (*recv_handler)(struct sk_buff *,
 162                                                 struct batadv_hard_iface *));
 163void batadv_recv_handler_unregister(uint8_t packet_type);
 164int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops);
 165int batadv_algo_select(struct batadv_priv *bat_priv, char *name);
 166int batadv_algo_seq_print_text(struct seq_file *seq, void *offset);
 167
 168/* all messages related to routing / flooding / broadcasting / etc */
 169enum batadv_dbg_level {
 170        BATADV_DBG_BATMAN = BIT(0),
 171        BATADV_DBG_ROUTES = BIT(1), /* route added / changed / deleted */
 172        BATADV_DBG_TT     = BIT(2), /* translation table operations */
 173        BATADV_DBG_BLA    = BIT(3), /* bridge loop avoidance */
 174        BATADV_DBG_ALL    = 15,
 175};
 176
 177#ifdef CONFIG_BATMAN_ADV_DEBUG
 178int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
 179__printf(2, 3);
 180
 181#define batadv_dbg(type, bat_priv, fmt, arg...)                 \
 182        do {                                                    \
 183                if (atomic_read(&bat_priv->log_level) & type)   \
 184                        batadv_debug_log(bat_priv, fmt, ## arg);\
 185        }                                                       \
 186        while (0)
 187#else /* !CONFIG_BATMAN_ADV_DEBUG */
 188__printf(3, 4)
 189static inline void batadv_dbg(int type __always_unused,
 190                              struct batadv_priv *bat_priv __always_unused,
 191                              const char *fmt __always_unused, ...)
 192{
 193}
 194#endif
 195
 196#define batadv_info(net_dev, fmt, arg...)                               \
 197        do {                                                            \
 198                struct net_device *_netdev = (net_dev);                 \
 199                struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
 200                batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);      \
 201                pr_info("%s: " fmt, _netdev->name, ## arg);             \
 202        } while (0)
 203#define batadv_err(net_dev, fmt, arg...)                                \
 204        do {                                                            \
 205                struct net_device *_netdev = (net_dev);                 \
 206                struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
 207                batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);      \
 208                pr_err("%s: " fmt, _netdev->name, ## arg);              \
 209        } while (0)
 210
 211/* returns 1 if they are the same ethernet addr
 212 *
 213 * note: can't use compare_ether_addr() as it requires aligned memory
 214 */
 215static inline int batadv_compare_eth(const void *data1, const void *data2)
 216{
 217        return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 218}
 219
 220/**
 221 * has_timed_out - compares current time (jiffies) and timestamp + timeout
 222 * @timestamp:          base value to compare with (in jiffies)
 223 * @timeout:            added to base value before comparing (in milliseconds)
 224 *
 225 * Returns true if current time is after timestamp + timeout
 226 */
 227static inline bool batadv_has_timed_out(unsigned long timestamp,
 228                                        unsigned int timeout)
 229{
 230        return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
 231}
 232
 233#define batadv_atomic_dec_not_zero(v)   atomic_add_unless((v), -1, 0)
 234
 235/* Returns the smallest signed integer in two's complement with the sizeof x */
 236#define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
 237
 238/* Checks if a sequence number x is a predecessor/successor of y.
 239 * they handle overflows/underflows and can correctly check for a
 240 * predecessor/successor unless the variable sequence number has grown by
 241 * more then 2**(bitwidth(x)-1)-1.
 242 * This means that for a uint8_t with the maximum value 255, it would think:
 243 *  - when adding nothing - it is neither a predecessor nor a successor
 244 *  - before adding more than 127 to the starting value - it is a predecessor,
 245 *  - when adding 128 - it is neither a predecessor nor a successor,
 246 *  - after adding more than 127 to the starting value - it is a successor
 247 */
 248#define batadv_seq_before(x, y) ({typeof(x) _d1 = (x); \
 249                                 typeof(y) _d2 = (y); \
 250                                 typeof(x) _dummy = (_d1 - _d2); \
 251                                 (void) (&_d1 == &_d2); \
 252                                 _dummy > batadv_smallest_signed_int(_dummy); })
 253#define batadv_seq_after(x, y) batadv_seq_before(y, x)
 254
 255/* Stop preemption on local cpu while incrementing the counter */
 256static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx,
 257                                      size_t count)
 258{
 259        int cpu = get_cpu();
 260        per_cpu_ptr(bat_priv->bat_counters, cpu)[idx] += count;
 261        put_cpu();
 262}
 263
 264#define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)
 265
 266/* Sum and return the cpu-local counters for index 'idx' */
 267static inline uint64_t batadv_sum_counter(struct batadv_priv *bat_priv,
 268                                          size_t idx)
 269{
 270        uint64_t *counters, sum = 0;
 271        int cpu;
 272
 273        for_each_possible_cpu(cpu) {
 274                counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
 275                sum += counters[idx];
 276        }
 277
 278        return sum;
 279}
 280
 281#endif /* _NET_BATMAN_ADV_MAIN_H_ */
 282
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