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 "2021.3" 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_ */ 385