net/batman-adv/main.h

   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 "2012.5.0"
  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 #define BATADV_DAT_ENTRY_TIMEOUT (5*60000) /* 5 mins in milliseconds */
  48 /* sliding packet range of received originator messages in sequence numbers
  49  * (should be a multiple of our word size)
  50  */
  51 #define BATADV_TQ_LOCAL_WINDOW_SIZE 64
  52 /* milliseconds we have to keep pending tt_req */
  53 #define BATADV_TT_REQUEST_TIMEOUT 3000
  54
  55 #define BATADV_TQ_GLOBAL_WINDOW_SIZE 5
  56 #define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
  57 #define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
  58 #define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1
  59
  60 /* number of OGMs sent with the last tt diff */
  61 #define BATADV_TT_OGM_APPEND_MAX 3
  62
  63 /* Time in which a client can roam at most ROAMING_MAX_COUNT times in
  64  * milliseconds
  65  */
  66 #define BATADV_ROAMING_MAX_TIME 20000
  67 #define BATADV_ROAMING_MAX_COUNT 5
  68
  69 #define BATADV_NO_FLAGS 0
  70
  71 #define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */
  72
  73 #define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE)
  74
  75 #define BATADV_LOG_BUF_LEN 8192   /* has to be a power of 2 */
  76
  77 /* msecs after which an ARP_REQUEST is sent in broadcast as fallback */
  78 #define ARP_REQ_DELAY 250
  79 /* numbers of originator to contact for any PUT/GET DHT operation */
  80 #define BATADV_DAT_CANDIDATES_NUM 3
  81
  82 #define BATADV_VIS_INTERVAL 5000        /* 5 seconds */
  83
  84 /* how much worse secondary interfaces may be to be considered as bonding
  85  * candidates
  86  */
  87 #define BATADV_BONDING_TQ_THRESHOLD     50
  88
  89 /* should not be bigger than 512 bytes or change the size of
  90  * forw_packet->direct_link_flags
  91  */
  92 #define BATADV_MAX_AGGREGATION_BYTES 512
  93 #define BATADV_MAX_AGGREGATION_MS 100
  94
  95 #define BATADV_BLA_PERIOD_LENGTH        10000   /* 10 seconds */
  96 #define BATADV_BLA_BACKBONE_TIMEOUT     (BATADV_BLA_PERIOD_LENGTH * 3)
  97 #define BATADV_BLA_CLAIM_TIMEOUT        (BATADV_BLA_PERIOD_LENGTH * 10)
  98 #define BATADV_BLA_WAIT_PERIODS         3
  99
 100 #define BATADV_DUPLIST_SIZE             16
 101 #define BATADV_DUPLIST_TIMEOUT          500     /* 500 ms */
 102 /* don't reset again within 30 seconds */
 103 #define BATADV_RESET_PROTECTION_MS 30000
 104 #define BATADV_EXPECTED_SEQNO_RANGE     65536
 105
 106 enum batadv_mesh_state {
 107         BATADV_MESH_INACTIVE,
 108         BATADV_MESH_ACTIVE,
 109         BATADV_MESH_DEACTIVATING,
 110 };
 111
 112 #define BATADV_BCAST_QUEUE_LEN          256
 113 #define BATADV_BATMAN_QUEUE_LEN 256
 114
 115 enum batadv_uev_action {
 116         BATADV_UEV_ADD = 0,
 117         BATADV_UEV_DEL,
 118         BATADV_UEV_CHANGE,
 119 };
 120
 121 enum batadv_uev_type {
 122         BATADV_UEV_GW = 0,
 123 };
 124
 125 #define BATADV_GW_THRESHOLD     50
 126
 127 #define BATADV_DAT_CANDIDATE_NOT_FOUND  0
 128 #define BATADV_DAT_CANDIDATE_ORIG       1
 129
 130 /* Debug Messages */
 131 #ifdef pr_fmt
 132 #undef pr_fmt
 133 #endif
 134 /* Append 'batman-adv: ' before kernel messages */
 135 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 136
 137 /* Kernel headers */
 138
 139 #include <linux/mutex.h>        /* mutex */
 140 #include <linux/module.h>       /* needed by all modules */
 141 #include <linux/netdevice.h>    /* netdevice */
 142 #include <linux/etherdevice.h>  /* ethernet address classification */
 143 #include <linux/if_ether.h>     /* ethernet header */
 144 #include <linux/poll.h>         /* poll_table */
 145 #include <linux/kthread.h>      /* kernel threads */
 146 #include <linux/pkt_sched.h>    /* schedule types */
 147 #include <linux/workqueue.h>    /* workqueue */
 148 #include <linux/percpu.h>
 149 #include <linux/slab.h>
 150 #include <net/sock.h>           /* struct sock */
 151 #include <linux/jiffies.h>
 152 #include <linux/seq_file.h>
 153 #include "types.h"
 154
 155 extern char batadv_routing_algo[];
 156 extern struct list_head batadv_hardif_list;
 157
 158 extern unsigned char batadv_broadcast_addr[];
 159 extern struct workqueue_struct *batadv_event_workqueue;
 160
 161 int batadv_mesh_init(struct net_device *soft_iface);
 162 void batadv_mesh_free(struct net_device *soft_iface);
 163 int batadv_is_my_mac(const uint8_t *addr);
 164 struct batadv_hard_iface *
 165 batadv_seq_print_text_primary_if_get(struct seq_file *seq);
 166 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 167                            struct packet_type *ptype,
 168                            struct net_device *orig_dev);
 169 int
 170 batadv_recv_handler_register(uint8_t packet_type,
 171                              int (*recv_handler)(struct sk_buff *,
 172                                                  struct batadv_hard_iface *));
 173 void batadv_recv_handler_unregister(uint8_t packet_type);
 174 int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops);
 175 int batadv_algo_select(struct batadv_priv *bat_priv, char *name);
 176 int batadv_algo_seq_print_text(struct seq_file *seq, void *offset);
 177 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);
 178
 179 /**
 180  * enum batadv_dbg_level - available log levels
 181  * @BATADV_DBG_BATMAN: OGM and TQ computations related messages
 182  * @BATADV_DBG_ROUTES: route added / changed / deleted
 183  * @BATADV_DBG_TT: translation table messages
 184  * @BATADV_DBG_BLA: bridge loop avoidance messages
 185  * @BATADV_DBG_DAT: ARP snooping and DAT related messages
 186  * @BATADV_DBG_ALL: the union of all the above log levels
 187  */
 188 enum batadv_dbg_level {
 189         BATADV_DBG_BATMAN = BIT(0),
 190         BATADV_DBG_ROUTES = BIT(1),
 191         BATADV_DBG_TT     = BIT(2),
 192         BATADV_DBG_BLA    = BIT(3),
 193         BATADV_DBG_DAT    = BIT(4),
 194         BATADV_DBG_ALL    = 31,
 195 };
 196
 197 #ifdef CONFIG_BATMAN_ADV_DEBUG
 198 int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
 199 __printf(2, 3);
 200
 201 #define batadv_dbg(type, bat_priv, fmt, arg...)                 \
 202         do {                                                    \
 203                 if (atomic_read(&bat_priv->log_level) & type)   \
 204                         batadv_debug_log(bat_priv, fmt, ## arg);\
 205         }                                                       \
 206         while (0)
 207 #else /* !CONFIG_BATMAN_ADV_DEBUG */
 208 __printf(3, 4)
 209 static inline void batadv_dbg(int type __always_unused,
 210                               struct batadv_priv *bat_priv __always_unused,
 211                               const char *fmt __always_unused, ...)
 212 {
 213 }
 214 #endif
 215
 216 #define batadv_info(net_dev, fmt, arg...)                               \
 217         do {                                                            \
 218                 struct net_device *_netdev = (net_dev);                 \
 219                 struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
 220                 batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);      \
 221                 pr_info("%s: " fmt, _netdev->name, ## arg);             \
 222         } while (0)
 223 #define batadv_err(net_dev, fmt, arg...)                                \
 224         do {                                                            \
 225                 struct net_device *_netdev = (net_dev);                 \
 226                 struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
 227                 batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);      \
 228                 pr_err("%s: " fmt, _netdev->name, ## arg);              \
 229         } while (0)
 230
 231 /* returns 1 if they are the same ethernet addr
 232  *
 233  * note: can't use compare_ether_addr() as it requires aligned memory
 234  */
 235 static inline int batadv_compare_eth(const void *data1, const void *data2)
 236 {
 237         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 238 }
 239
 240 /**
 241  * has_timed_out - compares current time (jiffies) and timestamp + timeout
 242  * @timestamp:          base value to compare with (in jiffies)
 243  * @timeout:            added to base value before comparing (in milliseconds)
 244  *
 245  * Returns true if current time is after timestamp + timeout
 246  */
 247 static inline bool batadv_has_timed_out(unsigned long timestamp,
 248                                         unsigned int timeout)
 249 {
 250         return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
 251 }
 252
 253 #define batadv_atomic_dec_not_zero(v)   atomic_add_unless((v), -1, 0)
 254
 255 /* Returns the smallest signed integer in two's complement with the sizeof x */
 256 #define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
 257
 258 /* Checks if a sequence number x is a predecessor/successor of y.
 259  * they handle overflows/underflows and can correctly check for a
 260  * predecessor/successor unless the variable sequence number has grown by
 261  * more then 2**(bitwidth(x)-1)-1.
 262  * This means that for a uint8_t with the maximum value 255, it would think:
 263  *  - when adding nothing - it is neither a predecessor nor a successor
 264  *  - before adding more than 127 to the starting value - it is a predecessor,
 265  *  - when adding 128 - it is neither a predecessor nor a successor,
 266  *  - after adding more than 127 to the starting value - it is a successor
 267  */
 268 #define batadv_seq_before(x, y) ({typeof(x) _d1 = (x); \
 269                                  typeof(y) _d2 = (y); \
 270                                  typeof(x) _dummy = (_d1 - _d2); \
 271                                  (void) (&_d1 == &_d2); \
 272                                  _dummy > batadv_smallest_signed_int(_dummy); })
 273 #define batadv_seq_after(x, y) batadv_seq_before(y, x)
 274
 275 /* Stop preemption on local cpu while incrementing the counter */
 276 static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx,
 277                                       size_t count)
 278 {
 279         int cpu = get_cpu();
 280         per_cpu_ptr(bat_priv->bat_counters, cpu)[idx] += count;
 281         put_cpu();
 282 }
 283
 284 #define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)
 285
 286 /* Sum and return the cpu-local counters for index 'idx' */
 287 static inline uint64_t batadv_sum_counter(struct batadv_priv *bat_priv,
 288                                           size_t idx)
 289 {
 290         uint64_t *counters, sum = 0;
 291         int cpu;
 292
 293         for_each_possible_cpu(cpu) {
 294                 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
 295                 sum += counters[idx];
 296         }
 297
 298         return sum;
 299 }
 300
 301 #endif /* _NET_BATMAN_ADV_MAIN_H_ */