329 lines
11 KiB
C
329 lines
11 KiB
C
/* Copyright (C) 2007-2013 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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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 <lindner_marek@yahoo.de>, " \
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"Simon Wunderlich <siwu@hrz.tu-chemnitz.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 "2013.3.0"
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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_JITTER 20
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/* Time To Live of broadcast messages */
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#define BATADV_TTL 50
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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_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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/* 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_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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#define BATADV_NUM_BCASTS_MAX 3
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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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#define BATADV_VIS_INTERVAL 5000 /* 5 seconds */
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/* how much worse secondary interfaces may be to be considered as bonding
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* candidates
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*/
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#define BATADV_BONDING_TQ_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 * 3)
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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_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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enum batadv_mesh_state {
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BATADV_MESH_INACTIVE,
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BATADV_MESH_ACTIVE,
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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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enum batadv_uev_action {
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BATADV_UEV_ADD = 0,
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BATADV_UEV_DEL,
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BATADV_UEV_CHANGE,
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};
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enum batadv_uev_type {
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BATADV_UEV_GW = 0,
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};
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#define BATADV_GW_THRESHOLD 50
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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/mutex.h> /* mutex */
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#include <linux/module.h> /* needed by all modules */
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#include <linux/netdevice.h> /* netdevice */
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#include <linux/etherdevice.h> /* ethernet address classification */
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#include <linux/if_ether.h> /* ethernet header */
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#include <linux/poll.h> /* poll_table */
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#include <linux/kthread.h> /* kernel threads */
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#include <linux/pkt_sched.h> /* schedule types */
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#include <linux/workqueue.h> /* workqueue */
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#include <linux/percpu.h>
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#include <linux/slab.h>
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#include <net/sock.h> /* struct sock */
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#include <net/rtnetlink.h>
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#include <linux/jiffies.h>
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#include <linux/seq_file.h>
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#include "types.h"
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/**
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* batadv_vlan_flags - flags for the four MSB of any vlan ID field
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* @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not
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*/
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enum batadv_vlan_flags {
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BATADV_VLAN_HAS_TAG = BIT(15),
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};
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#define BATADV_PRINT_VID(vid) (vid & BATADV_VLAN_HAS_TAG ? \
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(int)(vid & VLAN_VID_MASK) : -1)
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extern char batadv_routing_algo[];
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extern struct list_head batadv_hardif_list;
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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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int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr);
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struct batadv_hard_iface *
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batadv_seq_print_text_primary_if_get(struct seq_file *seq);
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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(uint8_t 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(uint8_t packet_type);
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int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops);
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int batadv_algo_select(struct batadv_priv *bat_priv, char *name);
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int batadv_algo_seq_print_text(struct seq_file *seq, void *offset);
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__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);
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/**
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* enum batadv_dbg_level - available log levels
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* @BATADV_DBG_BATMAN: OGM and TQ computations related messages
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* @BATADV_DBG_ROUTES: route added / changed / deleted
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* @BATADV_DBG_TT: translation table messages
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* @BATADV_DBG_BLA: bridge loop avoidance messages
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* @BATADV_DBG_DAT: ARP snooping and DAT related messages
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* @BATADV_DBG_NC: network coding related messages
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* @BATADV_DBG_ALL: the union of all the above log levels
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*/
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enum batadv_dbg_level {
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BATADV_DBG_BATMAN = BIT(0),
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BATADV_DBG_ROUTES = BIT(1),
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BATADV_DBG_TT = BIT(2),
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BATADV_DBG_BLA = BIT(3),
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BATADV_DBG_DAT = BIT(4),
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BATADV_DBG_NC = BIT(5),
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BATADV_DBG_ALL = 63,
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};
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#ifdef CONFIG_BATMAN_ADV_DEBUG
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int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
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__printf(2, 3);
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#define batadv_dbg(type, bat_priv, fmt, arg...) \
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do { \
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if (atomic_read(&bat_priv->log_level) & type) \
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batadv_debug_log(bat_priv, fmt, ## arg);\
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} \
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while (0)
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#else /* !CONFIG_BATMAN_ADV_DEBUG */
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__printf(3, 4)
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static inline void batadv_dbg(int type __always_unused,
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struct batadv_priv *bat_priv __always_unused,
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const char *fmt __always_unused, ...)
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{
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}
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#endif
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#define batadv_info(net_dev, fmt, arg...) \
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do { \
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struct net_device *_netdev = (net_dev); \
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struct batadv_priv *_batpriv = netdev_priv(_netdev); \
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batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg); \
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pr_info("%s: " fmt, _netdev->name, ## arg); \
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} while (0)
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#define batadv_err(net_dev, fmt, arg...) \
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do { \
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struct net_device *_netdev = (net_dev); \
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struct batadv_priv *_batpriv = netdev_priv(_netdev); \
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batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg); \
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pr_err("%s: " fmt, _netdev->name, ## arg); \
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} while (0)
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/* returns 1 if they are the same ethernet addr
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*
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* note: can't use compare_ether_addr() as it requires aligned memory
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*/
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static inline int batadv_compare_eth(const void *data1, const void *data2)
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{
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return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
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}
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/**
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* has_timed_out - compares current time (jiffies) and timestamp + 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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* Returns 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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#define batadv_atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
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/* Returns the smallest signed integer in two's complement with the sizeof x */
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#define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
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/* Checks if a sequence number x is a predecessor/successor of y.
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* they handle overflows/underflows and can correctly check for a
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* predecessor/successor unless the variable sequence number has grown by
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* more then 2**(bitwidth(x)-1)-1.
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* This means that for a uint8_t with the maximum value 255, it would think:
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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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#define batadv_seq_before(x, y) ({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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#define batadv_seq_after(x, y) batadv_seq_before(y, x)
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/* Stop preemption on local cpu while incrementing the counter */
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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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#define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)
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/* Sum and return the cpu-local counters for index 'idx' */
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static inline uint64_t batadv_sum_counter(struct batadv_priv *bat_priv,
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size_t idx)
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{
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uint64_t *counters, sum = 0;
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int cpu;
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for_each_possible_cpu(cpu) {
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counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
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sum += counters[idx];
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}
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return sum;
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}
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/* Define a macro to reach the control buffer of the skb. The members of the
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* control buffer are defined in struct batadv_skb_cb in types.h.
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* The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h.
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*/
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#define BATADV_SKB_CB(__skb) ((struct batadv_skb_cb *)&((__skb)->cb[0]))
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#endif /* _NET_BATMAN_ADV_MAIN_H_ */
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