385 строки
12 KiB
C
385 строки
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*/
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#ifndef _NET_BATMAN_ADV_MAIN_H_
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#define _NET_BATMAN_ADV_MAIN_H_
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#define BATADV_DRIVER_AUTHOR "Marek Lindner <mareklindner@neomailbox.ch>, " \
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"Simon Wunderlich <sw@simonwunderlich.de>"
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#define BATADV_DRIVER_DESC "B.A.T.M.A.N. advanced"
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#define BATADV_DRIVER_DEVICE "batman-adv"
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#ifndef BATADV_SOURCE_VERSION
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#define BATADV_SOURCE_VERSION "2021.3"
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#endif
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/* B.A.T.M.A.N. parameters */
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#define BATADV_TQ_MAX_VALUE 255
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#define BATADV_THROUGHPUT_MAX_VALUE 0xFFFFFFFF
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#define BATADV_JITTER 20
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/* Time To Live of broadcast messages */
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#define BATADV_TTL 50
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/* maximum sequence number age of broadcast messages */
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#define BATADV_BCAST_MAX_AGE 64
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/* purge originators after time in seconds if no valid packet comes in
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* -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE
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*/
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#define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */
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#define BATADV_TT_LOCAL_TIMEOUT 600000 /* in milliseconds */
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#define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */
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#define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */
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#define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */
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#define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */
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#define BATADV_MCAST_WORK_PERIOD 500 /* 0.5 seconds */
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#define BATADV_DAT_ENTRY_TIMEOUT (5 * 60000) /* 5 mins in milliseconds */
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/* sliding packet range of received originator messages in sequence numbers
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* (should be a multiple of our word size)
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*/
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#define BATADV_TQ_LOCAL_WINDOW_SIZE 64
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/* milliseconds we have to keep pending tt_req */
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#define BATADV_TT_REQUEST_TIMEOUT 3000
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#define BATADV_TQ_GLOBAL_WINDOW_SIZE 5
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#define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
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#define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
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#define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1
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/* B.A.T.M.A.N. V */
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#define BATADV_THROUGHPUT_DEFAULT_VALUE 10 /* 1 Mbps */
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#define BATADV_ELP_PROBES_PER_NODE 2
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#define BATADV_ELP_MIN_PROBE_SIZE 200 /* bytes */
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#define BATADV_ELP_PROBE_MAX_TX_DIFF 100 /* milliseconds */
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#define BATADV_ELP_MAX_AGE 64
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#define BATADV_OGM_MAX_ORIGDIFF 5
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#define BATADV_OGM_MAX_AGE 64
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/* number of OGMs sent with the last tt diff */
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#define BATADV_TT_OGM_APPEND_MAX 3
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/* Time in which a client can roam at most ROAMING_MAX_COUNT times in
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* milliseconds
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*/
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#define BATADV_ROAMING_MAX_TIME 20000
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#define BATADV_ROAMING_MAX_COUNT 5
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#define BATADV_NO_FLAGS 0
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#define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */
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#define BATADV_NO_MARK 0
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/* default interface for multi interface operation. The default interface is
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* used for communication which originated locally (i.e. is not forwarded)
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* or where special forwarding is not desired/necessary.
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*/
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#define BATADV_IF_DEFAULT ((struct batadv_hard_iface *)NULL)
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#define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE)
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#define BATADV_LOG_BUF_LEN 8192 /* has to be a power of 2 */
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/* number of packets to send for broadcasts on different interface types */
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#define BATADV_NUM_BCASTS_DEFAULT 1
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#define BATADV_NUM_BCASTS_WIRELESS 3
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/* length of the single packet used by the TP meter */
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#define BATADV_TP_PACKET_LEN ETH_DATA_LEN
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/* msecs after which an ARP_REQUEST is sent in broadcast as fallback */
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#define ARP_REQ_DELAY 250
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/* numbers of originator to contact for any PUT/GET DHT operation */
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#define BATADV_DAT_CANDIDATES_NUM 3
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/* BATADV_TQ_SIMILARITY_THRESHOLD - TQ points that a secondary metric can differ
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* at most from the primary one in order to be still considered acceptable
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*/
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#define BATADV_TQ_SIMILARITY_THRESHOLD 50
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/* should not be bigger than 512 bytes or change the size of
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* forw_packet->direct_link_flags
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*/
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#define BATADV_MAX_AGGREGATION_BYTES 512
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#define BATADV_MAX_AGGREGATION_MS 100
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#define BATADV_BLA_PERIOD_LENGTH 10000 /* 10 seconds */
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#define BATADV_BLA_BACKBONE_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 6)
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#define BATADV_BLA_CLAIM_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 10)
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#define BATADV_BLA_WAIT_PERIODS 3
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#define BATADV_BLA_LOOPDETECT_PERIODS 6
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#define BATADV_BLA_LOOPDETECT_TIMEOUT 3000 /* 3 seconds */
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#define BATADV_DUPLIST_SIZE 16
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#define BATADV_DUPLIST_TIMEOUT 500 /* 500 ms */
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/* don't reset again within 30 seconds */
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#define BATADV_RESET_PROTECTION_MS 30000
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#define BATADV_EXPECTED_SEQNO_RANGE 65536
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#define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */
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/**
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* BATADV_TP_MAX_NUM - maximum number of simultaneously active tp sessions
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*/
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#define BATADV_TP_MAX_NUM 5
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/**
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* enum batadv_mesh_state - State of a soft interface
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*/
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enum batadv_mesh_state {
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/** @BATADV_MESH_INACTIVE: soft interface is not yet running */
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BATADV_MESH_INACTIVE,
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/** @BATADV_MESH_ACTIVE: interface is up and running */
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BATADV_MESH_ACTIVE,
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/** @BATADV_MESH_DEACTIVATING: interface is getting shut down */
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BATADV_MESH_DEACTIVATING,
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};
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#define BATADV_BCAST_QUEUE_LEN 256
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#define BATADV_BATMAN_QUEUE_LEN 256
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/**
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* enum batadv_uev_action - action type of uevent
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*/
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enum batadv_uev_action {
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/** @BATADV_UEV_ADD: gateway was selected (after none was selected) */
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BATADV_UEV_ADD = 0,
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/**
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* @BATADV_UEV_DEL: selected gateway was removed and none is selected
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* anymore
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*/
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BATADV_UEV_DEL,
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/**
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* @BATADV_UEV_CHANGE: a different gateway was selected as based gateway
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*/
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BATADV_UEV_CHANGE,
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/**
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* @BATADV_UEV_LOOPDETECT: loop was detected which cannot be handled by
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* bridge loop avoidance
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*/
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BATADV_UEV_LOOPDETECT,
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};
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/**
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* enum batadv_uev_type - Type of uevent
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*/
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enum batadv_uev_type {
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/** @BATADV_UEV_GW: selected gateway was modified */
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BATADV_UEV_GW = 0,
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/** @BATADV_UEV_BLA: bridge loop avoidance event */
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BATADV_UEV_BLA,
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};
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#define BATADV_GW_THRESHOLD 50
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/* Number of fragment chains for each orig_node */
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#define BATADV_FRAG_BUFFER_COUNT 8
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/* Maximum number of fragments for one packet */
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#define BATADV_FRAG_MAX_FRAGMENTS 16
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/* Maxumim size of each fragment */
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#define BATADV_FRAG_MAX_FRAG_SIZE 1280
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/* Time to keep fragments while waiting for rest of the fragments */
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#define BATADV_FRAG_TIMEOUT 10000
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#define BATADV_DAT_CANDIDATE_NOT_FOUND 0
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#define BATADV_DAT_CANDIDATE_ORIG 1
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/* Debug Messages */
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#ifdef pr_fmt
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#undef pr_fmt
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#endif
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/* Append 'batman-adv: ' before kernel messages */
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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/* Kernel headers */
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#include <linux/atomic.h>
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#include <linux/compiler.h>
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#include <linux/etherdevice.h>
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#include <linux/if_vlan.h>
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#include <linux/jiffies.h>
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#include <linux/netdevice.h>
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#include <linux/percpu.h>
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#include <linux/skbuff.h>
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#include <linux/types.h>
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#include <uapi/linux/batadv_packet.h>
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#include "types.h"
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#include "main.h"
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/**
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* batadv_print_vid() - return printable version of vid information
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* @vid: the VLAN identifier
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*
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* Return: -1 when no VLAN is used, VLAN id otherwise
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*/
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static inline int batadv_print_vid(unsigned short vid)
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{
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if (vid & BATADV_VLAN_HAS_TAG)
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return (int)(vid & VLAN_VID_MASK);
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else
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return -1;
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}
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extern struct list_head batadv_hardif_list;
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extern unsigned int batadv_hardif_generation;
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extern unsigned char batadv_broadcast_addr[];
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extern struct workqueue_struct *batadv_event_workqueue;
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int batadv_mesh_init(struct net_device *soft_iface);
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void batadv_mesh_free(struct net_device *soft_iface);
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bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr);
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int batadv_max_header_len(void);
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void batadv_skb_set_priority(struct sk_buff *skb, int offset);
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int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *ptype,
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struct net_device *orig_dev);
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int
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batadv_recv_handler_register(u8 packet_type,
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int (*recv_handler)(struct sk_buff *,
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struct batadv_hard_iface *));
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void batadv_recv_handler_unregister(u8 packet_type);
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__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);
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/**
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* batadv_compare_eth() - Compare two not u16 aligned Ethernet addresses
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* @data1: Pointer to a six-byte array containing the Ethernet address
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* @data2: Pointer other six-byte array containing the Ethernet address
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*
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* note: can't use ether_addr_equal() as it requires aligned memory
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*
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* Return: true if they are the same ethernet addr
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*/
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static inline bool batadv_compare_eth(const void *data1, const void *data2)
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{
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return ether_addr_equal_unaligned(data1, data2);
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}
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/**
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* batadv_has_timed_out() - compares current time (jiffies) and timestamp +
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* timeout
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* @timestamp: base value to compare with (in jiffies)
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* @timeout: added to base value before comparing (in milliseconds)
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*
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* Return: true if current time is after timestamp + timeout
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*/
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static inline bool batadv_has_timed_out(unsigned long timestamp,
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unsigned int timeout)
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{
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return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
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}
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/**
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* batadv_atomic_dec_not_zero() - Decrease unless the number is 0
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* @v: pointer of type atomic_t
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*
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* Return: non-zero if v was not 0, and zero otherwise.
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*/
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#define batadv_atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
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/**
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* batadv_smallest_signed_int() - Returns the smallest signed integer in two's
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* complement with the sizeof x
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* @x: type of integer
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*
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* Return: smallest signed integer of type
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*/
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#define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
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/**
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* batadv_seq_before() - Checks if a sequence number x is a predecessor of y
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* @x: potential predecessor of @y
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* @y: value to compare @x against
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*
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* It handles overflows/underflows and can correctly check for a predecessor
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* unless the variable sequence number has grown by more than
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* 2**(bitwidth(x)-1)-1.
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*
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* This means that for a u8 with the maximum value 255, it would think:
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*
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* * when adding nothing - it is neither a predecessor nor a successor
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* * before adding more than 127 to the starting value - it is a predecessor,
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* * when adding 128 - it is neither a predecessor nor a successor,
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* * after adding more than 127 to the starting value - it is a successor
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*
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* Return: true when x is a predecessor of y, false otherwise
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*/
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#define batadv_seq_before(x, y) ({ \
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typeof(x)_d1 = (x); \
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typeof(y)_d2 = (y); \
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typeof(x)_dummy = (_d1 - _d2); \
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(void)(&_d1 == &_d2); \
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_dummy > batadv_smallest_signed_int(_dummy); \
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})
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/**
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* batadv_seq_after() - Checks if a sequence number x is a successor of y
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* @x: potential successor of @y
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* @y: value to compare @x against
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*
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* It handles overflows/underflows and can correctly check for a successor
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* unless the variable sequence number has grown by more than
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* 2**(bitwidth(x)-1)-1.
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*
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* This means that for a u8 with the maximum value 255, it would think:
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*
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* * when adding nothing - it is neither a predecessor nor a successor
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* * before adding more than 127 to the starting value - it is a predecessor,
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* * when adding 128 - it is neither a predecessor nor a successor,
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* * after adding more than 127 to the starting value - it is a successor
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*
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* Return: true when x is a successor of y, false otherwise
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*/
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#define batadv_seq_after(x, y) batadv_seq_before(y, x)
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/**
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* batadv_add_counter() - Add to per cpu statistics counter of soft interface
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* @bat_priv: the bat priv with all the soft interface information
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* @idx: counter index which should be modified
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* @count: value to increase counter by
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*
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* Stop preemption on local cpu while incrementing the counter
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*/
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static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx,
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size_t count)
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{
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this_cpu_add(bat_priv->bat_counters[idx], count);
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}
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/**
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* batadv_inc_counter() - Increase per cpu statistics counter of soft interface
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* @b: the bat priv with all the soft interface information
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* @i: counter index which should be modified
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*/
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#define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)
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/**
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* BATADV_SKB_CB() - Get batadv_skb_cb from skb control buffer
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* @__skb: skb holding the control buffer
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*
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* The members of the control buffer are defined in struct batadv_skb_cb in
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* types.h. The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h.
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*
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* Return: pointer to the batadv_skb_cb of the skb
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*/
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#define BATADV_SKB_CB(__skb) ((struct batadv_skb_cb *)&((__skb)->cb[0]))
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unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len);
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bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid);
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int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
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enum batadv_uev_action action, const char *data);
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#endif /* _NET_BATMAN_ADV_MAIN_H_ */
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