net/batman-adv/main.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* Copyright (C) B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  */
   6
   7 #ifndef _NET_BATMAN_ADV_MAIN_H_
   8 #define _NET_BATMAN_ADV_MAIN_H_
   9
  10 #define BATADV_DRIVER_AUTHOR "Marek Lindner <mareklindner@neomailbox.ch>, " \
  11                              "Simon Wunderlich <sw@simonwunderlich.de>"
  12 #define BATADV_DRIVER_DESC   "B.A.T.M.A.N. advanced"
  13 #define BATADV_DRIVER_DEVICE "batman-adv"
  14
  15 #ifndef BATADV_SOURCE_VERSION
  16 #define BATADV_SOURCE_VERSION "2024.3"
  17 #endif
  18
  19 /* B.A.T.M.A.N. parameters */
  20
  21 #define BATADV_TQ_MAX_VALUE 255
  22 #define BATADV_THROUGHPUT_MAX_VALUE 0xFFFFFFFF
  23 #define BATADV_JITTER 20
  24
  25 /* Time To Live of broadcast messages */
  26 #define BATADV_TTL 50
  27
  28 /* maximum sequence number age of broadcast messages */
  29 #define BATADV_BCAST_MAX_AGE 64
  30
  31 /* purge originators after time in seconds if no valid packet comes in
  32  * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE
  33  */
  34 #define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */
  35 #define BATADV_TT_LOCAL_TIMEOUT 600000 /* in milliseconds */
  36 #define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */
  37 #define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */
  38 #define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */
  39 #define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */
  40 #define BATADV_MCAST_WORK_PERIOD 500 /* 0.5 seconds */
  41 #define BATADV_DAT_ENTRY_TIMEOUT (5 * 60000) /* 5 mins in milliseconds */
  42 /* sliding packet range of received originator messages in sequence numbers
  43  * (should be a multiple of our word size)
  44  */
  45 #define BATADV_TQ_LOCAL_WINDOW_SIZE 64
  46 /* milliseconds we have to keep pending tt_req */
  47 #define BATADV_TT_REQUEST_TIMEOUT 3000
  48
  49 #define BATADV_TQ_GLOBAL_WINDOW_SIZE 5
  50 #define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
  51 #define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
  52 #define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1
  53
  54 /* B.A.T.M.A.N. V */
  55 #define BATADV_THROUGHPUT_DEFAULT_VALUE 10 /* 1 Mbps */
  56 #define BATADV_ELP_PROBES_PER_NODE 2
  57 #define BATADV_ELP_MIN_PROBE_SIZE 200 /* bytes */
  58 #define BATADV_ELP_PROBE_MAX_TX_DIFF 100 /* milliseconds */
  59 #define BATADV_ELP_MAX_AGE 64
  60 #define BATADV_OGM_MAX_ORIGDIFF 5
  61 #define BATADV_OGM_MAX_AGE 64
  62
  63 /* number of OGMs sent with the last tt diff */
  64 #define BATADV_TT_OGM_APPEND_MAX 3
  65
  66 /* Time in which a client can roam at most ROAMING_MAX_COUNT times in
  67  * milliseconds
  68  */
  69 #define BATADV_ROAMING_MAX_TIME 20000
  70 #define BATADV_ROAMING_MAX_COUNT 5
  71
  72 #define BATADV_NO_FLAGS 0
  73
  74 #define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */
  75
  76 #define BATADV_NO_MARK 0
  77
  78 /* default interface for multi interface operation. The default interface is
  79  * used for communication which originated locally (i.e. is not forwarded)
  80  * or where special forwarding is not desired/necessary.
  81  */
  82 #define BATADV_IF_DEFAULT       ((struct batadv_hard_iface *)NULL)
  83
  84 #define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE)
  85
  86 #define BATADV_LOG_BUF_LEN 8192   /* has to be a power of 2 */
  87
  88 /* number of packets to send for broadcasts on different interface types */
  89 #define BATADV_NUM_BCASTS_DEFAULT 1
  90 #define BATADV_NUM_BCASTS_WIRELESS 3
  91
  92 /* length of the single packet used by the TP meter */
  93 #define BATADV_TP_PACKET_LEN ETH_DATA_LEN
  94
  95 /* msecs after which an ARP_REQUEST is sent in broadcast as fallback */
  96 #define ARP_REQ_DELAY 250
  97 /* numbers of originator to contact for any PUT/GET DHT operation */
  98 #define BATADV_DAT_CANDIDATES_NUM 3
  99
 100 /* BATADV_TQ_SIMILARITY_THRESHOLD - TQ points that a secondary metric can differ
 101  * at most from the primary one in order to be still considered acceptable
 102  */
 103 #define BATADV_TQ_SIMILARITY_THRESHOLD 50
 104
 105 /* should not be bigger than 512 bytes or change the size of
 106  * forw_packet->direct_link_flags
 107  */
 108 #define BATADV_MAX_AGGREGATION_BYTES 512
 109 #define BATADV_MAX_AGGREGATION_MS 100
 110
 111 #define BATADV_BLA_PERIOD_LENGTH        10000   /* 10 seconds */
 112 #define BATADV_BLA_BACKBONE_TIMEOUT     (BATADV_BLA_PERIOD_LENGTH * 6)
 113 #define BATADV_BLA_CLAIM_TIMEOUT        (BATADV_BLA_PERIOD_LENGTH * 10)
 114 #define BATADV_BLA_WAIT_PERIODS         3
 115 #define BATADV_BLA_LOOPDETECT_PERIODS   6
 116 #define BATADV_BLA_LOOPDETECT_TIMEOUT   3000    /* 3 seconds */
 117
 118 #define BATADV_DUPLIST_SIZE             16
 119 #define BATADV_DUPLIST_TIMEOUT          500     /* 500 ms */
 120 /* don't reset again within 30 seconds */
 121 #define BATADV_RESET_PROTECTION_MS 30000
 122 #define BATADV_EXPECTED_SEQNO_RANGE     65536
 123
 124 #define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */
 125
 126 /**
 127  * BATADV_TP_MAX_NUM - maximum number of simultaneously active tp sessions
 128  */
 129 #define BATADV_TP_MAX_NUM 5
 130
 131 /**
 132  * enum batadv_mesh_state - State of a soft interface
 133  */
 134 enum batadv_mesh_state {
 135         /** @BATADV_MESH_INACTIVE: soft interface is not yet running */
 136         BATADV_MESH_INACTIVE,
 137
 138         /** @BATADV_MESH_ACTIVE: interface is up and running */
 139         BATADV_MESH_ACTIVE,
 140
 141         /** @BATADV_MESH_DEACTIVATING: interface is getting shut down */
 142         BATADV_MESH_DEACTIVATING,
 143 };
 144
 145 #define BATADV_BCAST_QUEUE_LEN          256
 146 #define BATADV_BATMAN_QUEUE_LEN 256
 147
 148 /**
 149  * enum batadv_uev_action - action type of uevent
 150  */
 151 enum batadv_uev_action {
 152         /** @BATADV_UEV_ADD: gateway was selected (after none was selected) */
 153         BATADV_UEV_ADD = 0,
 154
 155         /**
 156          * @BATADV_UEV_DEL: selected gateway was removed and none is selected
 157          * anymore
 158          */
 159         BATADV_UEV_DEL,
 160
 161         /**
 162          * @BATADV_UEV_CHANGE: a different gateway was selected as based gateway
 163          */
 164         BATADV_UEV_CHANGE,
 165
 166         /**
 167          * @BATADV_UEV_LOOPDETECT: loop was detected which cannot be handled by
 168          * bridge loop avoidance
 169          */
 170         BATADV_UEV_LOOPDETECT,
 171 };
 172
 173 /**
 174  * enum batadv_uev_type - Type of uevent
 175  */
 176 enum batadv_uev_type {
 177         /** @BATADV_UEV_GW: selected gateway was modified */
 178         BATADV_UEV_GW = 0,
 179
 180         /** @BATADV_UEV_BLA: bridge loop avoidance event */
 181         BATADV_UEV_BLA,
 182 };
 183
 184 #define BATADV_GW_THRESHOLD     50
 185
 186 /* Number of fragment chains for each orig_node */
 187 #define BATADV_FRAG_BUFFER_COUNT 8
 188 /* Maximum number of fragments for one packet */
 189 #define BATADV_FRAG_MAX_FRAGMENTS 16
 190 /* Maxumim size of each fragment */
 191 #define BATADV_FRAG_MAX_FRAG_SIZE 1280
 192 /* Time to keep fragments while waiting for rest of the fragments */
 193 #define BATADV_FRAG_TIMEOUT 10000
 194
 195 #define BATADV_DAT_CANDIDATE_NOT_FOUND  0
 196 #define BATADV_DAT_CANDIDATE_ORIG       1
 197
 198 /* Debug Messages */
 199 #ifdef pr_fmt
 200 #undef pr_fmt
 201 #endif
 202 /* Append 'batman-adv: ' before kernel messages */
 203 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 204
 205 /* Kernel headers */
 206
 207 #include <linux/atomic.h>
 208 #include <linux/compiler.h>
 209 #include <linux/etherdevice.h>
 210 #include <linux/if_vlan.h>
 211 #include <linux/jiffies.h>
 212 #include <linux/netdevice.h>
 213 #include <linux/percpu.h>
 214 #include <linux/skbuff.h>
 215 #include <linux/types.h>
 216 #include <uapi/linux/batadv_packet.h>
 217
 218 #include "types.h"
 219 #include "main.h"
 220
 221 /**
 222  * batadv_print_vid() - return printable version of vid information
 223  * @vid: the VLAN identifier
 224  *
 225  * Return: -1 when no VLAN is used, VLAN id otherwise
 226  */
 227 static inline int batadv_print_vid(unsigned short vid)
 228 {
 229         if (vid & BATADV_VLAN_HAS_TAG)
 230                 return (int)(vid & VLAN_VID_MASK);
 231         else
 232                 return -1;
 233 }
 234
 235 extern struct list_head batadv_hardif_list;
 236 extern unsigned int batadv_hardif_generation;
 237
 238 extern unsigned char batadv_broadcast_addr[];
 239 extern struct workqueue_struct *batadv_event_workqueue;
 240
 241 int batadv_mesh_init(struct net_device *soft_iface);
 242 void batadv_mesh_free(struct net_device *soft_iface);
 243 bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr);
 244 int batadv_max_header_len(void);
 245 void batadv_skb_set_priority(struct sk_buff *skb, int offset);
 246 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 247                            struct packet_type *ptype,
 248                            struct net_device *orig_dev);
 249 int
 250 batadv_recv_handler_register(u8 packet_type,
 251                              int (*recv_handler)(struct sk_buff *,
 252                                                  struct batadv_hard_iface *));
 253 void batadv_recv_handler_unregister(u8 packet_type);
 254 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);
 255
 256 /**
 257  * batadv_compare_eth() - Compare two not u16 aligned Ethernet addresses
 258  * @data1: Pointer to a six-byte array containing the Ethernet address
 259  * @data2: Pointer other six-byte array containing the Ethernet address
 260  *
 261  * note: can't use ether_addr_equal() as it requires aligned memory
 262  *
 263  * Return: true if they are the same ethernet addr
 264  */
 265 static inline bool batadv_compare_eth(const void *data1, const void *data2)
 266 {
 267         return ether_addr_equal_unaligned(data1, data2);
 268 }
 269
 270 /**
 271  * batadv_has_timed_out() - compares current time (jiffies) and timestamp +
 272  *  timeout
 273  * @timestamp:          base value to compare with (in jiffies)
 274  * @timeout:            added to base value before comparing (in milliseconds)
 275  *
 276  * Return: true if current time is after timestamp + timeout
 277  */
 278 static inline bool batadv_has_timed_out(unsigned long timestamp,
 279                                         unsigned int timeout)
 280 {
 281         return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
 282 }
 283
 284 /**
 285  * batadv_atomic_dec_not_zero() - Decrease unless the number is 0
 286  * @v: pointer of type atomic_t
 287  *
 288  * Return: non-zero if v was not 0, and zero otherwise.
 289  */
 290 #define batadv_atomic_dec_not_zero(v)   atomic_add_unless((v), -1, 0)
 291
 292 /**
 293  * batadv_smallest_signed_int() - Returns the smallest signed integer in two's
 294  *  complement with the sizeof x
 295  * @x: type of integer
 296  *
 297  * Return: smallest signed integer of type
 298  */
 299 #define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
 300
 301 /**
 302  * batadv_seq_before() - Checks if a sequence number x is a predecessor of y
 303  * @x: potential predecessor of @y
 304  * @y: value to compare @x against
 305  *
 306  * It handles overflows/underflows and can correctly check for a predecessor
 307  * unless the variable sequence number has grown by more than
 308  * 2**(bitwidth(x)-1)-1.
 309  *
 310  * This means that for a u8 with the maximum value 255, it would think:
 311  *
 312  * * when adding nothing - it is neither a predecessor nor a successor
 313  * * before adding more than 127 to the starting value - it is a predecessor,
 314  * * when adding 128 - it is neither a predecessor nor a successor,
 315  * * after adding more than 127 to the starting value - it is a successor
 316  *
 317  * Return: true when x is a predecessor of y, false otherwise
 318  */
 319 #define batadv_seq_before(x, y) ({ \
 320         typeof(x)_d1 = (x); \
 321         typeof(y)_d2 = (y); \
 322         typeof(x)_dummy = (_d1 - _d2); \
 323         (void)(&_d1 == &_d2); \
 324         _dummy > batadv_smallest_signed_int(_dummy); \
 325 })
 326
 327 /**
 328  * batadv_seq_after() - Checks if a sequence number x is a successor of y
 329  * @x: potential successor of @y
 330  * @y: value to compare @x against
 331  *
 332  * It handles overflows/underflows and can correctly check for a successor
 333  * unless the variable sequence number has grown by more than
 334  * 2**(bitwidth(x)-1)-1.
 335  *
 336  * This means that for a u8 with the maximum value 255, it would think:
 337  *
 338  * * when adding nothing - it is neither a predecessor nor a successor
 339  * * before adding more than 127 to the starting value - it is a predecessor,
 340  * * when adding 128 - it is neither a predecessor nor a successor,
 341  * * after adding more than 127 to the starting value - it is a successor
 342  *
 343  * Return: true when x is a successor of y, false otherwise
 344  */
 345 #define batadv_seq_after(x, y) batadv_seq_before(y, x)
 346
 347 /**
 348  * batadv_add_counter() - Add to per cpu statistics counter of soft interface
 349  * @bat_priv: the bat priv with all the soft interface information
 350  * @idx: counter index which should be modified
 351  * @count: value to increase counter by
 352  *
 353  * Stop preemption on local cpu while incrementing the counter
 354  */
 355 static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx,
 356                                       size_t count)
 357 {
 358         this_cpu_add(bat_priv->bat_counters[idx], count);
 359 }
 360
 361 /**
 362  * batadv_inc_counter() - Increase per cpu statistics counter of soft interface
 363  * @b: the bat priv with all the soft interface information
 364  * @i: counter index which should be modified
 365  */
 366 #define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)
 367
 368 /**
 369  * BATADV_SKB_CB() - Get batadv_skb_cb from skb control buffer
 370  * @__skb: skb holding the control buffer
 371  *
 372  * The members of the control buffer are defined in struct batadv_skb_cb in
 373  * types.h. The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h.
 374  *
 375  * Return: pointer to the batadv_skb_cb of the skb
 376  */
 377 #define BATADV_SKB_CB(__skb)       ((struct batadv_skb_cb *)&((__skb)->cb[0]))
 378
 379 unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len);
 380 bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid);
 381 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
 382                         enum batadv_uev_action action, const char *data);
 383
 384 #endif /* _NET_BATMAN_ADV_MAIN_H_ */