1 /* Copyright (C) 2007-2017 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 "2017.0" 28 #endif 29 30 /* B.A.T.M.A.N. parameters */ 31 32 #define BATADV_TQ_MAX_VALUE 255 33 #define BATADV_THROUGHPUT_MAX_VALUE 0xFFFFFFFF 34 #define BATADV_JITTER 20 35 36 /* Time To Live of broadcast messages */ 37 #define BATADV_TTL 50 38 39 /* maximum sequence number age of broadcast messages */ 40 #define BATADV_BCAST_MAX_AGE 64 41 42 /* purge originators after time in seconds if no valid packet comes in 43 * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE 44 */ 45 #define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */ 46 #define BATADV_TT_LOCAL_TIMEOUT 600000 /* in milliseconds */ 47 #define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */ 48 #define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */ 49 #define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */ 50 #define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */ 51 #define BATADV_MCAST_WORK_PERIOD 500 /* 0.5 seconds */ 52 #define BATADV_DAT_ENTRY_TIMEOUT (5 * 60000) /* 5 mins in milliseconds */ 53 /* sliding packet range of received originator messages in sequence numbers 54 * (should be a multiple of our word size) 55 */ 56 #define BATADV_TQ_LOCAL_WINDOW_SIZE 64 57 /* milliseconds we have to keep pending tt_req */ 58 #define BATADV_TT_REQUEST_TIMEOUT 3000 59 60 #define BATADV_TQ_GLOBAL_WINDOW_SIZE 5 61 #define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1 62 #define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1 63 #define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1 64 65 /* B.A.T.M.A.N. V */ 66 #define BATADV_THROUGHPUT_DEFAULT_VALUE 10 /* 1 Mbps */ 67 #define BATADV_ELP_PROBES_PER_NODE 2 68 #define BATADV_ELP_MIN_PROBE_SIZE 200 /* bytes */ 69 #define BATADV_ELP_PROBE_MAX_TX_DIFF 100 /* milliseconds */ 70 #define BATADV_ELP_MAX_AGE 64 71 #define BATADV_OGM_MAX_ORIGDIFF 5 72 #define BATADV_OGM_MAX_AGE 64 73 74 /* number of OGMs sent with the last tt diff */ 75 #define BATADV_TT_OGM_APPEND_MAX 3 76 77 /* Time in which a client can roam at most ROAMING_MAX_COUNT times in 78 * milliseconds 79 */ 80 #define BATADV_ROAMING_MAX_TIME 20000 81 #define BATADV_ROAMING_MAX_COUNT 5 82 83 #define BATADV_NO_FLAGS 0 84 85 #define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */ 86 87 #define BATADV_NO_MARK 0 88 89 /* default interface for multi interface operation. The default interface is 90 * used for communication which originated locally (i.e. is not forwarded) 91 * or where special forwarding is not desired/necessary. 92 */ 93 #define BATADV_IF_DEFAULT ((struct batadv_hard_iface *)NULL) 94 95 #define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE) 96 97 #define BATADV_LOG_BUF_LEN 8192 /* has to be a power of 2 */ 98 99 /* number of packets to send for broadcasts on different interface types */ 100 #define BATADV_NUM_BCASTS_DEFAULT 1 101 #define BATADV_NUM_BCASTS_WIRELESS 3 102 #define BATADV_NUM_BCASTS_MAX 3 103 104 /* length of the single packet used by the TP meter */ 105 #define BATADV_TP_PACKET_LEN ETH_DATA_LEN 106 107 /* msecs after which an ARP_REQUEST is sent in broadcast as fallback */ 108 #define ARP_REQ_DELAY 250 109 /* numbers of originator to contact for any PUT/GET DHT operation */ 110 #define BATADV_DAT_CANDIDATES_NUM 3 111 112 /* BATADV_TQ_SIMILARITY_THRESHOLD - TQ points that a secondary metric can differ 113 * at most from the primary one in order to be still considered acceptable 114 */ 115 #define BATADV_TQ_SIMILARITY_THRESHOLD 50 116 117 /* should not be bigger than 512 bytes or change the size of 118 * forw_packet->direct_link_flags 119 */ 120 #define BATADV_MAX_AGGREGATION_BYTES 512 121 #define BATADV_MAX_AGGREGATION_MS 100 122 123 #define BATADV_BLA_PERIOD_LENGTH 10000 /* 10 seconds */ 124 #define BATADV_BLA_BACKBONE_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 6) 125 #define BATADV_BLA_CLAIM_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 10) 126 #define BATADV_BLA_WAIT_PERIODS 3 127 #define BATADV_BLA_LOOPDETECT_PERIODS 6 128 #define BATADV_BLA_LOOPDETECT_TIMEOUT 3000 /* 3 seconds */ 129 130 #define BATADV_DUPLIST_SIZE 16 131 #define BATADV_DUPLIST_TIMEOUT 500 /* 500 ms */ 132 /* don't reset again within 30 seconds */ 133 #define BATADV_RESET_PROTECTION_MS 30000 134 #define BATADV_EXPECTED_SEQNO_RANGE 65536 135 136 #define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */ 137 138 /** 139 * BATADV_TP_MAX_NUM - maximum number of simultaneously active tp sessions 140 */ 141 #define BATADV_TP_MAX_NUM 5 142 143 enum batadv_mesh_state { 144 BATADV_MESH_INACTIVE, 145 BATADV_MESH_ACTIVE, 146 BATADV_MESH_DEACTIVATING, 147 }; 148 149 #define BATADV_BCAST_QUEUE_LEN 256 150 #define BATADV_BATMAN_QUEUE_LEN 256 151 152 enum batadv_uev_action { 153 BATADV_UEV_ADD = 0, 154 BATADV_UEV_DEL, 155 BATADV_UEV_CHANGE, 156 BATADV_UEV_LOOPDETECT, 157 }; 158 159 enum batadv_uev_type { 160 BATADV_UEV_GW = 0, 161 BATADV_UEV_BLA, 162 }; 163 164 #define BATADV_GW_THRESHOLD 50 165 166 /* Number of fragment chains for each orig_node */ 167 #define BATADV_FRAG_BUFFER_COUNT 8 168 /* Maximum number of fragments for one packet */ 169 #define BATADV_FRAG_MAX_FRAGMENTS 16 170 /* Maxumim size of each fragment */ 171 #define BATADV_FRAG_MAX_FRAG_SIZE 1400 172 /* Time to keep fragments while waiting for rest of the fragments */ 173 #define BATADV_FRAG_TIMEOUT 10000 174 175 #define BATADV_DAT_CANDIDATE_NOT_FOUND 0 176 #define BATADV_DAT_CANDIDATE_ORIG 1 177 178 /* Debug Messages */ 179 #ifdef pr_fmt 180 #undef pr_fmt 181 #endif 182 /* Append 'batman-adv: ' before kernel messages */ 183 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 184 185 /* Kernel headers */ 186 187 #include <linux/bitops.h> /* for packet.h */ 188 #include <linux/compiler.h> 189 #include <linux/etherdevice.h> 190 #include <linux/if_ether.h> /* for packet.h */ 191 #include <linux/if_vlan.h> 192 #include <linux/jiffies.h> 193 #include <linux/percpu.h> 194 #include <linux/types.h> 195 196 #include "types.h" 197 198 struct net_device; 199 struct packet_type; 200 struct seq_file; 201 struct sk_buff; 202 203 #define BATADV_PRINT_VID(vid) (((vid) & BATADV_VLAN_HAS_TAG) ? \ 204 (int)((vid) & VLAN_VID_MASK) : -1) 205 206 extern struct list_head batadv_hardif_list; 207 208 extern unsigned char batadv_broadcast_addr[]; 209 extern struct workqueue_struct *batadv_event_workqueue; 210 211 int batadv_mesh_init(struct net_device *soft_iface); 212 void batadv_mesh_free(struct net_device *soft_iface); 213 bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr); 214 struct batadv_hard_iface * 215 batadv_seq_print_text_primary_if_get(struct seq_file *seq); 216 int batadv_max_header_len(void); 217 void batadv_skb_set_priority(struct sk_buff *skb, int offset); 218 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, 219 struct packet_type *ptype, 220 struct net_device *orig_dev); 221 int 222 batadv_recv_handler_register(u8 packet_type, 223 int (*recv_handler)(struct sk_buff *, 224 struct batadv_hard_iface *)); 225 void batadv_recv_handler_unregister(u8 packet_type); 226 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr); 227 228 /** 229 * batadv_compare_eth - Compare two not u16 aligned Ethernet addresses 230 * @data1: Pointer to a six-byte array containing the Ethernet address 231 * @data2: Pointer other six-byte array containing the Ethernet address 232 * 233 * note: can't use ether_addr_equal() as it requires aligned memory 234 * 235 * Return: true if they are the same ethernet addr 236 */ 237 static inline bool batadv_compare_eth(const void *data1, const void *data2) 238 { 239 return ether_addr_equal_unaligned(data1, data2); 240 } 241 242 /** 243 * batadv_has_timed_out - compares current time (jiffies) and timestamp + 244 * timeout 245 * @timestamp: base value to compare with (in jiffies) 246 * @timeout: added to base value before comparing (in milliseconds) 247 * 248 * Return: true if current time is after timestamp + timeout 249 */ 250 static inline bool batadv_has_timed_out(unsigned long timestamp, 251 unsigned int timeout) 252 { 253 return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout)); 254 } 255 256 #define batadv_atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0) 257 258 /* Returns the smallest signed integer in two's complement with the sizeof x */ 259 #define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u))) 260 261 /* Checks if a sequence number x is a predecessor/successor of y. 262 * they handle overflows/underflows and can correctly check for a 263 * predecessor/successor unless the variable sequence number has grown by 264 * more then 2**(bitwidth(x)-1)-1. 265 * This means that for a u8 with the maximum value 255, it would think: 266 * - when adding nothing - it is neither a predecessor nor a successor 267 * - before adding more than 127 to the starting value - it is a predecessor, 268 * - when adding 128 - it is neither a predecessor nor a successor, 269 * - after adding more than 127 to the starting value - it is a successor 270 */ 271 #define batadv_seq_before(x, y) ({typeof(x)_d1 = (x); \ 272 typeof(y)_d2 = (y); \ 273 typeof(x)_dummy = (_d1 - _d2); \ 274 (void)(&_d1 == &_d2); \ 275 _dummy > batadv_smallest_signed_int(_dummy); }) 276 #define batadv_seq_after(x, y) batadv_seq_before(y, x) 277 278 /* Stop preemption on local cpu while incrementing the counter */ 279 static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx, 280 size_t count) 281 { 282 this_cpu_add(bat_priv->bat_counters[idx], count); 283 } 284 285 #define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1) 286 287 /* Define a macro to reach the control buffer of the skb. The members of the 288 * control buffer are defined in struct batadv_skb_cb in types.h. 289 * The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h. 290 */ 291 #define BATADV_SKB_CB(__skb) ((struct batadv_skb_cb *)&((__skb)->cb[0])) 292 293 unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len); 294 bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid); 295 296 #endif /* _NET_BATMAN_ADV_MAIN_H_ */ 297