net/batman-adv/main.h

   1 /* Copyright (C) 2007-2014 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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef _NET_BATMAN_ADV_MAIN_H_
  19 #define _NET_BATMAN_ADV_MAIN_H_
  20
  21 #define BATADV_DRIVER_AUTHOR "Marek Lindner <mareklindner@neomailbox.ch>, " \
  22                              "Simon Wunderlich <sw@simonwunderlich.de>"
  23 #define BATADV_DRIVER_DESC   "B.A.T.M.A.N. advanced"
  24 #define BATADV_DRIVER_DEVICE "batman-adv"
  25
  26 #ifndef BATADV_SOURCE_VERSION
  27 #define BATADV_SOURCE_VERSION "2014.4.0"
  28 #endif
  29
  30 /* B.A.T.M.A.N. parameters */
  31
  32 #define BATADV_TQ_MAX_VALUE 255
  33 #define BATADV_JITTER 20
  34
  35 /* Time To Live of broadcast messages */
  36 #define BATADV_TTL 50
  37
  38 /* purge originators after time in seconds if no valid packet comes in
  39  * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE
  40  */
  41 #define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */
  42 #define BATADV_TT_LOCAL_TIMEOUT 600000 /* in milliseconds */
  43 #define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */
  44 #define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */
  45 #define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */
  46 #define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */
  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_NO_MARK 0
  74
  75 /* default interface for multi interface operation. The default interface is
  76  * used for communication which originated locally (i.e. is not forwarded)
  77  * or where special forwarding is not desired/necessary.
  78  */
  79 #define BATADV_IF_DEFAULT       ((struct batadv_hard_iface *)NULL)
  80
  81 #define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE)
  82
  83 #define BATADV_LOG_BUF_LEN 8192   /* has to be a power of 2 */
  84
  85 /* number of packets to send for broadcasts on different interface types */
  86 #define BATADV_NUM_BCASTS_DEFAULT 1
  87 #define BATADV_NUM_BCASTS_WIRELESS 3
  88 #define BATADV_NUM_BCASTS_MAX 3
  89
  90 /* msecs after which an ARP_REQUEST is sent in broadcast as fallback */
  91 #define ARP_REQ_DELAY 250
  92 /* numbers of originator to contact for any PUT/GET DHT operation */
  93 #define BATADV_DAT_CANDIDATES_NUM 3
  94
  95 /**
  96  * BATADV_TQ_SIMILARITY_THRESHOLD - TQ points that a secondary metric can differ
  97  *  at most from the primary one in order to be still considered acceptable
  98  */
  99 #define BATADV_TQ_SIMILARITY_THRESHOLD 50
 100
 101 /* how much worse secondary interfaces may be to be considered as bonding
 102  * candidates
 103  */
 104 #define BATADV_BONDING_TQ_THRESHOLD     50
 105
 106 /* should not be bigger than 512 bytes or change the size of
 107  * forw_packet->direct_link_flags
 108  */
 109 #define BATADV_MAX_AGGREGATION_BYTES 512
 110 #define BATADV_MAX_AGGREGATION_MS 100
 111
 112 #define BATADV_BLA_PERIOD_LENGTH        10000   /* 10 seconds */
 113 #define BATADV_BLA_BACKBONE_TIMEOUT     (BATADV_BLA_PERIOD_LENGTH * 3)
 114 #define BATADV_BLA_CLAIM_TIMEOUT        (BATADV_BLA_PERIOD_LENGTH * 10)
 115 #define BATADV_BLA_WAIT_PERIODS         3
 116
 117 #define BATADV_DUPLIST_SIZE             16
 118 #define BATADV_DUPLIST_TIMEOUT          500     /* 500 ms */
 119 /* don't reset again within 30 seconds */
 120 #define BATADV_RESET_PROTECTION_MS 30000
 121 #define BATADV_EXPECTED_SEQNO_RANGE     65536
 122
 123 #define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */
 124
 125 enum batadv_mesh_state {
 126         BATADV_MESH_INACTIVE,
 127         BATADV_MESH_ACTIVE,
 128         BATADV_MESH_DEACTIVATING,
 129 };
 130
 131 #define BATADV_BCAST_QUEUE_LEN          256
 132 #define BATADV_BATMAN_QUEUE_LEN 256
 133
 134 enum batadv_uev_action {
 135         BATADV_UEV_ADD = 0,
 136         BATADV_UEV_DEL,
 137         BATADV_UEV_CHANGE,
 138 };
 139
 140 enum batadv_uev_type {
 141         BATADV_UEV_GW = 0,
 142 };
 143
 144 #define BATADV_GW_THRESHOLD     50
 145
 146 /* Number of fragment chains for each orig_node */
 147 #define BATADV_FRAG_BUFFER_COUNT 8
 148 /* Maximum number of fragments for one packet */
 149 #define BATADV_FRAG_MAX_FRAGMENTS 16
 150 /* Maxumim size of each fragment */
 151 #define BATADV_FRAG_MAX_FRAG_SIZE 1400
 152 /* Time to keep fragments while waiting for rest of the fragments */
 153 #define BATADV_FRAG_TIMEOUT 10000
 154
 155 #define BATADV_DAT_CANDIDATE_NOT_FOUND  0
 156 #define BATADV_DAT_CANDIDATE_ORIG       1
 157
 158 /* Debug Messages */
 159 #ifdef pr_fmt
 160 #undef pr_fmt
 161 #endif
 162 /* Append 'batman-adv: ' before kernel messages */
 163 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 164
 165 /* Kernel headers */
 166
 167 #include <linux/mutex.h>        /* mutex */
 168 #include <linux/module.h>       /* needed by all modules */
 169 #include <linux/netdevice.h>    /* netdevice */
 170 #include <linux/etherdevice.h>  /* ethernet address classification */
 171 #include <linux/if_ether.h>     /* ethernet header */
 172 #include <linux/poll.h>         /* poll_table */
 173 #include <linux/kthread.h>      /* kernel threads */
 174 #include <linux/pkt_sched.h>    /* schedule types */
 175 #include <linux/workqueue.h>    /* workqueue */
 176 #include <linux/percpu.h>
 177 #include <linux/slab.h>
 178 #include <net/sock.h>           /* struct sock */
 179 #include <net/addrconf.h>       /* ipv6 address stuff */
 180 #include <linux/ip.h>
 181 #include <net/rtnetlink.h>
 182 #include <linux/jiffies.h>
 183 #include <linux/seq_file.h>
 184 #include <linux/if_vlan.h>
 185
 186 #include "types.h"
 187
 188 #define BATADV_PRINT_VID(vid) (vid & BATADV_VLAN_HAS_TAG ? \
 189                                (int)(vid & VLAN_VID_MASK) : -1)
 190
 191 extern char batadv_routing_algo[];
 192 extern struct list_head batadv_hardif_list;
 193
 194 extern unsigned char batadv_broadcast_addr[];
 195 extern struct workqueue_struct *batadv_event_workqueue;
 196
 197 int batadv_mesh_init(struct net_device *soft_iface);
 198 void batadv_mesh_free(struct net_device *soft_iface);
 199 int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr);
 200 struct batadv_hard_iface *
 201 batadv_seq_print_text_primary_if_get(struct seq_file *seq);
 202 int batadv_max_header_len(void);
 203 void batadv_skb_set_priority(struct sk_buff *skb, int offset);
 204 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 205                            struct packet_type *ptype,
 206                            struct net_device *orig_dev);
 207 int
 208 batadv_recv_handler_register(uint8_t packet_type,
 209                              int (*recv_handler)(struct sk_buff *,
 210                                                  struct batadv_hard_iface *));
 211 void batadv_recv_handler_unregister(uint8_t packet_type);
 212 int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops);
 213 int batadv_algo_select(struct batadv_priv *bat_priv, char *name);
 214 int batadv_algo_seq_print_text(struct seq_file *seq, void *offset);
 215 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);
 216
 217 /**
 218  * enum batadv_dbg_level - available log levels
 219  * @BATADV_DBG_BATMAN: OGM and TQ computations related messages
 220  * @BATADV_DBG_ROUTES: route added / changed / deleted
 221  * @BATADV_DBG_TT: translation table messages
 222  * @BATADV_DBG_BLA: bridge loop avoidance messages
 223  * @BATADV_DBG_DAT: ARP snooping and DAT related messages
 224  * @BATADV_DBG_NC: network coding related messages
 225  * @BATADV_DBG_ALL: the union of all the above log levels
 226  */
 227 enum batadv_dbg_level {
 228         BATADV_DBG_BATMAN = BIT(0),
 229         BATADV_DBG_ROUTES = BIT(1),
 230         BATADV_DBG_TT     = BIT(2),
 231         BATADV_DBG_BLA    = BIT(3),
 232         BATADV_DBG_DAT    = BIT(4),
 233         BATADV_DBG_NC     = BIT(5),
 234         BATADV_DBG_ALL    = 63,
 235 };
 236
 237 #ifdef CONFIG_BATMAN_ADV_DEBUG
 238 int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
 239 __printf(2, 3);
 240
 241 /* possibly ratelimited debug output */
 242 #define _batadv_dbg(type, bat_priv, ratelimited, fmt, arg...)   \
 243         do {                                                    \
 244                 if (atomic_read(&bat_priv->log_level) & type && \
 245                     (!ratelimited || net_ratelimit()))          \
 246                         batadv_debug_log(bat_priv, fmt, ## arg);\
 247         }                                                       \
 248         while (0)
 249 #else /* !CONFIG_BATMAN_ADV_DEBUG */
 250 __printf(4, 5)
 251 static inline void _batadv_dbg(int type __always_unused,
 252                                struct batadv_priv *bat_priv __always_unused,
 253                                int ratelimited __always_unused,
 254                                const char *fmt __always_unused, ...)
 255 {
 256 }
 257 #endif
 258
 259 #define batadv_dbg(type, bat_priv, arg...) \
 260         _batadv_dbg(type, bat_priv, 0, ## arg)
 261 #define batadv_dbg_ratelimited(type, bat_priv, arg...) \
 262         _batadv_dbg(type, bat_priv, 1, ## arg)
 263
 264 #define batadv_info(net_dev, fmt, arg...)                               \
 265         do {                                                            \
 266                 struct net_device *_netdev = (net_dev);                 \
 267                 struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
 268                 batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);      \
 269                 pr_info("%s: " fmt, _netdev->name, ## arg);             \
 270         } while (0)
 271 #define batadv_err(net_dev, fmt, arg...)                                \
 272         do {                                                            \
 273                 struct net_device *_netdev = (net_dev);                 \
 274                 struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
 275                 batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);      \
 276                 pr_err("%s: " fmt, _netdev->name, ## arg);              \
 277         } while (0)
 278
 279 /* returns 1 if they are the same ethernet addr
 280  *
 281  * note: can't use ether_addr_equal() as it requires aligned memory
 282  */
 283 static inline int batadv_compare_eth(const void *data1, const void *data2)
 284 {
 285         return ether_addr_equal_unaligned(data1, data2);
 286 }
 287
 288 /**
 289  * has_timed_out - compares current time (jiffies) and timestamp + timeout
 290  * @timestamp:          base value to compare with (in jiffies)
 291  * @timeout:            added to base value before comparing (in milliseconds)
 292  *
 293  * Returns true if current time is after timestamp + timeout
 294  */
 295 static inline bool batadv_has_timed_out(unsigned long timestamp,
 296                                         unsigned int timeout)
 297 {
 298         return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
 299 }
 300
 301 #define batadv_atomic_dec_not_zero(v)   atomic_add_unless((v), -1, 0)
 302
 303 /* Returns the smallest signed integer in two's complement with the sizeof x */
 304 #define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
 305
 306 /* Checks if a sequence number x is a predecessor/successor of y.
 307  * they handle overflows/underflows and can correctly check for a
 308  * predecessor/successor unless the variable sequence number has grown by
 309  * more then 2**(bitwidth(x)-1)-1.
 310  * This means that for a uint8_t with the maximum value 255, it would think:
 311  *  - when adding nothing - it is neither a predecessor nor a successor
 312  *  - before adding more than 127 to the starting value - it is a predecessor,
 313  *  - when adding 128 - it is neither a predecessor nor a successor,
 314  *  - after adding more than 127 to the starting value - it is a successor
 315  */
 316 #define batadv_seq_before(x, y) ({typeof(x) _d1 = (x); \
 317                                  typeof(y) _d2 = (y); \
 318                                  typeof(x) _dummy = (_d1 - _d2); \
 319                                  (void) (&_d1 == &_d2); \
 320                                  _dummy > batadv_smallest_signed_int(_dummy); })
 321 #define batadv_seq_after(x, y) batadv_seq_before(y, x)
 322
 323 /* Stop preemption on local cpu while incrementing the counter */
 324 static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx,
 325                                       size_t count)
 326 {
 327         this_cpu_add(bat_priv->bat_counters[idx], count);
 328 }
 329
 330 #define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)
 331
 332 /* Sum and return the cpu-local counters for index 'idx' */
 333 static inline uint64_t batadv_sum_counter(struct batadv_priv *bat_priv,
 334                                           size_t idx)
 335 {
 336         uint64_t *counters, sum = 0;
 337         int cpu;
 338
 339         for_each_possible_cpu(cpu) {
 340                 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
 341                 sum += counters[idx];
 342         }
 343
 344         return sum;
 345 }
 346
 347 /* Define a macro to reach the control buffer of the skb. The members of the
 348  * control buffer are defined in struct batadv_skb_cb in types.h.
 349  * The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h.
 350  */
 351 #define BATADV_SKB_CB(__skb)       ((struct batadv_skb_cb *)&((__skb)->cb[0]))
 352
 353 void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
 354                                     uint8_t type, uint8_t version,
 355                                     void *tvlv_value, uint16_t tvlv_value_len);
 356 uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
 357                                           unsigned char **packet_buff,
 358                                           int *packet_buff_len,
 359                                           int packet_min_len);
 360 void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
 361                              struct batadv_ogm_packet *batadv_ogm_packet,
 362                              struct batadv_orig_node *orig_node);
 363 void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
 364                                       uint8_t type, uint8_t version);
 365
 366 void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
 367                                   void (*optr)(struct batadv_priv *bat_priv,
 368                                                struct batadv_orig_node *orig,
 369                                                uint8_t flags,
 370                                                void *tvlv_value,
 371                                                uint16_t tvlv_value_len),
 372                                   int (*uptr)(struct batadv_priv *bat_priv,
 373                                               uint8_t *src, uint8_t *dst,
 374                                               void *tvlv_value,
 375                                               uint16_t tvlv_value_len),
 376                                   uint8_t type, uint8_t version, uint8_t flags);
 377 void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
 378                                     uint8_t type, uint8_t version);
 379 int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
 380                                    bool ogm_source,
 381                                    struct batadv_orig_node *orig_node,
 382                                    uint8_t *src, uint8_t *dst,
 383                                    void *tvlv_buff, uint16_t tvlv_buff_len);
 384 void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src,
 385                               uint8_t *dst, uint8_t type, uint8_t version,
 386                               void *tvlv_value, uint16_t tvlv_value_len);
 387 unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len);
 388 bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid);
 389
 390 #endif /* _NET_BATMAN_ADV_MAIN_H_ */