linux/net/batman-adv/types.h

2455 lines
62 KiB
C
Raw Normal View History

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2007-2019 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*/
#ifndef _NET_BATMAN_ADV_TYPES_H_
#define _NET_BATMAN_ADV_TYPES_H_
2015-04-17 17:40:28 +00:00
#ifndef _NET_BATMAN_ADV_MAIN_H_
#error only "main.h" can be included directly
#endif
#include <linux/average.h>
2015-04-17 17:40:28 +00:00
#include <linux/bitops.h>
#include <linux/compiler.h>
#include <linux/if.h>
2015-04-17 17:40:28 +00:00
#include <linux/if_ether.h>
#include <linux/kref.h>
2015-04-17 17:40:28 +00:00
#include <linux/netdevice.h>
#include <linux/netlink.h>
2015-04-17 17:40:28 +00:00
#include <linux/sched.h> /* for linux/wait.h */
#include <linux/seq_file.h>
#include <linux/skbuff.h>
2015-04-17 17:40:28 +00:00
#include <linux/spinlock.h>
#include <linux/timer.h>
2015-04-17 17:40:28 +00:00
#include <linux/types.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>
2015-04-17 17:40:28 +00:00
#ifdef CONFIG_BATMAN_ADV_DAT
/**
* typedef batadv_dat_addr_t - type used for all DHT addresses
*
* If it is changed, BATADV_DAT_ADDR_MAX is changed as well.
*
* *Please be careful: batadv_dat_addr_t must be UNSIGNED*
*/
typedef u16 batadv_dat_addr_t;
#endif /* CONFIG_BATMAN_ADV_DAT */
/**
* enum batadv_dhcp_recipient - dhcp destination
*/
enum batadv_dhcp_recipient {
/** @BATADV_DHCP_NO: packet is not a dhcp message */
BATADV_DHCP_NO = 0,
/** @BATADV_DHCP_TO_SERVER: dhcp message is directed to a server */
BATADV_DHCP_TO_SERVER,
/** @BATADV_DHCP_TO_CLIENT: dhcp message is directed to a client */
BATADV_DHCP_TO_CLIENT,
};
/**
* BATADV_TT_REMOTE_MASK - bitmask selecting the flags that are sent over the
* wire only
*/
#define BATADV_TT_REMOTE_MASK 0x00FF
/**
* BATADV_TT_SYNC_MASK - bitmask of the flags that need to be kept in sync
* among the nodes. These flags are used to compute the global/local CRC
*/
#define BATADV_TT_SYNC_MASK 0x00F0
/**
* struct batadv_hard_iface_bat_iv - per hard-interface B.A.T.M.A.N. IV data
*/
struct batadv_hard_iface_bat_iv {
/** @ogm_buff: buffer holding the OGM packet */
unsigned char *ogm_buff;
/** @ogm_buff_len: length of the OGM packet buffer */
int ogm_buff_len;
/** @ogm_seqno: OGM sequence number - used to identify each OGM */
atomic_t ogm_seqno;
};
/**
* enum batadv_v_hard_iface_flags - interface flags useful to B.A.T.M.A.N. V
*/
enum batadv_v_hard_iface_flags {
/**
* @BATADV_FULL_DUPLEX: tells if the connection over this link is
* full-duplex
*/
BATADV_FULL_DUPLEX = BIT(0),
/**
* @BATADV_WARNING_DEFAULT: tells whether we have warned the user that
* no throughput data is available for this interface and that default
* values are assumed.
*/
BATADV_WARNING_DEFAULT = BIT(1),
};
batman-adv: ELP - adding basic infrastructure The B.A.T.M.A.N. protocol originally only used a single message type (called OGM) to determine the link qualities to the direct neighbors and spreading these link quality information through the whole mesh. This procedure is summarized on the BATMAN concept page and explained in details in the RFC draft published in 2008. This approach was chosen for its simplicity during the protocol design phase and the implementation. However, it also bears some drawbacks: * Wireless interfaces usually come with some packet loss, therefore a higher broadcast rate is desirable to allow a fast reaction on flaky connections. Other interfaces of the same host might be connected to Ethernet LANs / VPNs / etc which rarely exhibit packet loss would benefit from a lower broadcast rate to reduce overhead. * It generally is more desirable to detect local link quality changes at a faster rate than propagating all these changes through the entire mesh (the far end of the mesh does not need to care about local link quality changes that much). Other optimizations strategies, like reducing overhead, might be possible if OGMs weren't used for all tasks in the mesh at the same time. As a result detecting local link qualities shall be handled by an independent message type, ELP, whereas the OGM message type remains responsible for flooding the mesh with these link quality information and determining the overall path transmit qualities. Developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG. Signed-off-by: Linus Luessing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
2016-01-16 08:40:09 +00:00
/**
* struct batadv_hard_iface_bat_v - per hard-interface B.A.T.M.A.N. V data
*/
struct batadv_hard_iface_bat_v {
/** @elp_interval: time interval between two ELP transmissions */
batman-adv: ELP - adding basic infrastructure The B.A.T.M.A.N. protocol originally only used a single message type (called OGM) to determine the link qualities to the direct neighbors and spreading these link quality information through the whole mesh. This procedure is summarized on the BATMAN concept page and explained in details in the RFC draft published in 2008. This approach was chosen for its simplicity during the protocol design phase and the implementation. However, it also bears some drawbacks: * Wireless interfaces usually come with some packet loss, therefore a higher broadcast rate is desirable to allow a fast reaction on flaky connections. Other interfaces of the same host might be connected to Ethernet LANs / VPNs / etc which rarely exhibit packet loss would benefit from a lower broadcast rate to reduce overhead. * It generally is more desirable to detect local link quality changes at a faster rate than propagating all these changes through the entire mesh (the far end of the mesh does not need to care about local link quality changes that much). Other optimizations strategies, like reducing overhead, might be possible if OGMs weren't used for all tasks in the mesh at the same time. As a result detecting local link qualities shall be handled by an independent message type, ELP, whereas the OGM message type remains responsible for flooding the mesh with these link quality information and determining the overall path transmit qualities. Developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG. Signed-off-by: Linus Luessing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
2016-01-16 08:40:09 +00:00
atomic_t elp_interval;
/** @elp_seqno: current ELP sequence number */
batman-adv: ELP - adding basic infrastructure The B.A.T.M.A.N. protocol originally only used a single message type (called OGM) to determine the link qualities to the direct neighbors and spreading these link quality information through the whole mesh. This procedure is summarized on the BATMAN concept page and explained in details in the RFC draft published in 2008. This approach was chosen for its simplicity during the protocol design phase and the implementation. However, it also bears some drawbacks: * Wireless interfaces usually come with some packet loss, therefore a higher broadcast rate is desirable to allow a fast reaction on flaky connections. Other interfaces of the same host might be connected to Ethernet LANs / VPNs / etc which rarely exhibit packet loss would benefit from a lower broadcast rate to reduce overhead. * It generally is more desirable to detect local link quality changes at a faster rate than propagating all these changes through the entire mesh (the far end of the mesh does not need to care about local link quality changes that much). Other optimizations strategies, like reducing overhead, might be possible if OGMs weren't used for all tasks in the mesh at the same time. As a result detecting local link qualities shall be handled by an independent message type, ELP, whereas the OGM message type remains responsible for flooding the mesh with these link quality information and determining the overall path transmit qualities. Developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG. Signed-off-by: Linus Luessing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
2016-01-16 08:40:09 +00:00
atomic_t elp_seqno;
/** @elp_skb: base skb containing the ELP message to send */
batman-adv: ELP - adding basic infrastructure The B.A.T.M.A.N. protocol originally only used a single message type (called OGM) to determine the link qualities to the direct neighbors and spreading these link quality information through the whole mesh. This procedure is summarized on the BATMAN concept page and explained in details in the RFC draft published in 2008. This approach was chosen for its simplicity during the protocol design phase and the implementation. However, it also bears some drawbacks: * Wireless interfaces usually come with some packet loss, therefore a higher broadcast rate is desirable to allow a fast reaction on flaky connections. Other interfaces of the same host might be connected to Ethernet LANs / VPNs / etc which rarely exhibit packet loss would benefit from a lower broadcast rate to reduce overhead. * It generally is more desirable to detect local link quality changes at a faster rate than propagating all these changes through the entire mesh (the far end of the mesh does not need to care about local link quality changes that much). Other optimizations strategies, like reducing overhead, might be possible if OGMs weren't used for all tasks in the mesh at the same time. As a result detecting local link qualities shall be handled by an independent message type, ELP, whereas the OGM message type remains responsible for flooding the mesh with these link quality information and determining the overall path transmit qualities. Developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG. Signed-off-by: Linus Luessing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
2016-01-16 08:40:09 +00:00
struct sk_buff *elp_skb;
/** @elp_wq: workqueue used to schedule ELP transmissions */
batman-adv: ELP - adding basic infrastructure The B.A.T.M.A.N. protocol originally only used a single message type (called OGM) to determine the link qualities to the direct neighbors and spreading these link quality information through the whole mesh. This procedure is summarized on the BATMAN concept page and explained in details in the RFC draft published in 2008. This approach was chosen for its simplicity during the protocol design phase and the implementation. However, it also bears some drawbacks: * Wireless interfaces usually come with some packet loss, therefore a higher broadcast rate is desirable to allow a fast reaction on flaky connections. Other interfaces of the same host might be connected to Ethernet LANs / VPNs / etc which rarely exhibit packet loss would benefit from a lower broadcast rate to reduce overhead. * It generally is more desirable to detect local link quality changes at a faster rate than propagating all these changes through the entire mesh (the far end of the mesh does not need to care about local link quality changes that much). Other optimizations strategies, like reducing overhead, might be possible if OGMs weren't used for all tasks in the mesh at the same time. As a result detecting local link qualities shall be handled by an independent message type, ELP, whereas the OGM message type remains responsible for flooding the mesh with these link quality information and determining the overall path transmit qualities. Developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG. Signed-off-by: Linus Luessing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
2016-01-16 08:40:09 +00:00
struct delayed_work elp_wq;
/**
* @throughput_override: throughput override to disable link
* auto-detection
*/
atomic_t throughput_override;
/** @flags: interface specific flags */
u8 flags;
batman-adv: ELP - adding basic infrastructure The B.A.T.M.A.N. protocol originally only used a single message type (called OGM) to determine the link qualities to the direct neighbors and spreading these link quality information through the whole mesh. This procedure is summarized on the BATMAN concept page and explained in details in the RFC draft published in 2008. This approach was chosen for its simplicity during the protocol design phase and the implementation. However, it also bears some drawbacks: * Wireless interfaces usually come with some packet loss, therefore a higher broadcast rate is desirable to allow a fast reaction on flaky connections. Other interfaces of the same host might be connected to Ethernet LANs / VPNs / etc which rarely exhibit packet loss would benefit from a lower broadcast rate to reduce overhead. * It generally is more desirable to detect local link quality changes at a faster rate than propagating all these changes through the entire mesh (the far end of the mesh does not need to care about local link quality changes that much). Other optimizations strategies, like reducing overhead, might be possible if OGMs weren't used for all tasks in the mesh at the same time. As a result detecting local link qualities shall be handled by an independent message type, ELP, whereas the OGM message type remains responsible for flooding the mesh with these link quality information and determining the overall path transmit qualities. Developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG. Signed-off-by: Linus Luessing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
2016-01-16 08:40:09 +00:00
};
/**
* enum batadv_hard_iface_wifi_flags - Flags describing the wifi configuration
* of a batadv_hard_iface
*/
enum batadv_hard_iface_wifi_flags {
/** @BATADV_HARDIF_WIFI_WEXT_DIRECT: it is a wext wifi device */
BATADV_HARDIF_WIFI_WEXT_DIRECT = BIT(0),
/** @BATADV_HARDIF_WIFI_CFG80211_DIRECT: it is a cfg80211 wifi device */
BATADV_HARDIF_WIFI_CFG80211_DIRECT = BIT(1),
/**
* @BATADV_HARDIF_WIFI_WEXT_INDIRECT: link device is a wext wifi device
*/
BATADV_HARDIF_WIFI_WEXT_INDIRECT = BIT(2),
/**
* @BATADV_HARDIF_WIFI_CFG80211_INDIRECT: link device is a cfg80211 wifi
* device
*/
BATADV_HARDIF_WIFI_CFG80211_INDIRECT = BIT(3),
};
/**
* struct batadv_hard_iface - network device known to batman-adv
*/
struct batadv_hard_iface {
/** @list: list node for batadv_hardif_list */
struct list_head list;
/** @if_status: status of the interface for batman-adv */
char if_status;
/**
* @num_bcasts: number of payload re-broadcasts on this interface (ARQ)
*/
u8 num_bcasts;
/**
* @wifi_flags: flags whether this is (directly or indirectly) a wifi
* interface
*/
u32 wifi_flags;
/** @net_dev: pointer to the net_device */
struct net_device *net_dev;
/** @hardif_obj: kobject of the per interface sysfs "mesh" directory */
struct kobject *hardif_obj;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/**
* @batman_adv_ptype: packet type describing packets that should be
* processed by batman-adv for this interface
*/
struct packet_type batman_adv_ptype;
/**
* @soft_iface: the batman-adv interface which uses this network
* interface
*/
struct net_device *soft_iface;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
/** @bat_iv: per hard-interface B.A.T.M.A.N. IV data */
struct batadv_hard_iface_bat_iv bat_iv;
batman-adv: ELP - adding basic infrastructure The B.A.T.M.A.N. protocol originally only used a single message type (called OGM) to determine the link qualities to the direct neighbors and spreading these link quality information through the whole mesh. This procedure is summarized on the BATMAN concept page and explained in details in the RFC draft published in 2008. This approach was chosen for its simplicity during the protocol design phase and the implementation. However, it also bears some drawbacks: * Wireless interfaces usually come with some packet loss, therefore a higher broadcast rate is desirable to allow a fast reaction on flaky connections. Other interfaces of the same host might be connected to Ethernet LANs / VPNs / etc which rarely exhibit packet loss would benefit from a lower broadcast rate to reduce overhead. * It generally is more desirable to detect local link quality changes at a faster rate than propagating all these changes through the entire mesh (the far end of the mesh does not need to care about local link quality changes that much). Other optimizations strategies, like reducing overhead, might be possible if OGMs weren't used for all tasks in the mesh at the same time. As a result detecting local link qualities shall be handled by an independent message type, ELP, whereas the OGM message type remains responsible for flooding the mesh with these link quality information and determining the overall path transmit qualities. Developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG. Signed-off-by: Linus Luessing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
2016-01-16 08:40:09 +00:00
#ifdef CONFIG_BATMAN_ADV_BATMAN_V
/** @bat_v: per hard-interface B.A.T.M.A.N. V data */
batman-adv: ELP - adding basic infrastructure The B.A.T.M.A.N. protocol originally only used a single message type (called OGM) to determine the link qualities to the direct neighbors and spreading these link quality information through the whole mesh. This procedure is summarized on the BATMAN concept page and explained in details in the RFC draft published in 2008. This approach was chosen for its simplicity during the protocol design phase and the implementation. However, it also bears some drawbacks: * Wireless interfaces usually come with some packet loss, therefore a higher broadcast rate is desirable to allow a fast reaction on flaky connections. Other interfaces of the same host might be connected to Ethernet LANs / VPNs / etc which rarely exhibit packet loss would benefit from a lower broadcast rate to reduce overhead. * It generally is more desirable to detect local link quality changes at a faster rate than propagating all these changes through the entire mesh (the far end of the mesh does not need to care about local link quality changes that much). Other optimizations strategies, like reducing overhead, might be possible if OGMs weren't used for all tasks in the mesh at the same time. As a result detecting local link qualities shall be handled by an independent message type, ELP, whereas the OGM message type remains responsible for flooding the mesh with these link quality information and determining the overall path transmit qualities. Developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG. Signed-off-by: Linus Luessing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
2016-01-16 08:40:09 +00:00
struct batadv_hard_iface_bat_v bat_v;
#endif
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
/**
* @debug_dir: dentry for nc subdir in batman-adv directory in debugfs
*/
struct dentry *debug_dir;
#endif
/**
* @neigh_list: list of unique single hop neighbors via this interface
*/
struct hlist_head neigh_list;
/** @neigh_list_lock: lock protecting neigh_list */
spinlock_t neigh_list_lock;
};
/**
* struct batadv_orig_ifinfo - B.A.T.M.A.N. IV private orig_ifinfo members
*/
struct batadv_orig_ifinfo_bat_iv {
/**
* @bcast_own: bitfield which counts the number of our OGMs this
* orig_node rebroadcasted "back" to us (relative to last_real_seqno)
*/
DECLARE_BITMAP(bcast_own, BATADV_TQ_LOCAL_WINDOW_SIZE);
/** @bcast_own_sum: sum of bcast_own */
u8 bcast_own_sum;
};
/**
* struct batadv_orig_ifinfo - originator info per outgoing interface
*/
struct batadv_orig_ifinfo {
/** @list: list node for &batadv_orig_node.ifinfo_list */
struct hlist_node list;
/** @if_outgoing: pointer to outgoing hard-interface */
struct batadv_hard_iface *if_outgoing;
/** @router: router that should be used to reach this originator */
struct batadv_neigh_node __rcu *router;
/** @last_real_seqno: last and best known sequence number */
u32 last_real_seqno;
/** @last_ttl: ttl of last received packet */
u8 last_ttl;
/** @last_seqno_forwarded: seqno of the OGM which was forwarded last */
u32 last_seqno_forwarded;
/** @batman_seqno_reset: time when the batman seqno window was reset */
unsigned long batman_seqno_reset;
/** @bat_iv: B.A.T.M.A.N. IV private structure */
struct batadv_orig_ifinfo_bat_iv bat_iv;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
};
/**
* struct batadv_frag_table_entry - head in the fragment buffer table
*/
struct batadv_frag_table_entry {
/** @fragment_list: head of list with fragments */
struct hlist_head fragment_list;
/** @lock: lock to protect the list of fragments */
spinlock_t lock;
/** @timestamp: time (jiffie) of last received fragment */
unsigned long timestamp;
/** @seqno: sequence number of the fragments in the list */
u16 seqno;
/** @size: accumulated size of packets in list */
u16 size;
/** @total_size: expected size of the assembled packet */
u16 total_size;
};
/**
* struct batadv_frag_list_entry - entry in a list of fragments
*/
struct batadv_frag_list_entry {
/** @list: list node information */
struct hlist_node list;
/** @skb: fragment */
struct sk_buff *skb;
/** @no: fragment number in the set */
u8 no;
};
/**
* struct batadv_vlan_tt - VLAN specific TT attributes
*/
struct batadv_vlan_tt {
/** @crc: CRC32 checksum of the entries belonging to this vlan */
u32 crc;
/** @num_entries: number of TT entries for this VLAN */
atomic_t num_entries;
};
/**
* struct batadv_orig_node_vlan - VLAN specific data per orig_node
*/
struct batadv_orig_node_vlan {
/** @vid: the VLAN identifier */
unsigned short vid;
/** @tt: VLAN specific TT attributes */
struct batadv_vlan_tt tt;
/** @list: list node for &batadv_orig_node.vlan_list */
struct hlist_node list;
/**
* @refcount: number of context where this object is currently in use
*/
struct kref refcount;
/** @rcu: struct used for freeing in a RCU-safe manner */
struct rcu_head rcu;
};
/**
* struct batadv_orig_bat_iv - B.A.T.M.A.N. IV private orig_node members
*/
struct batadv_orig_bat_iv {
/**
* @ogm_cnt_lock: lock protecting &batadv_orig_ifinfo_bat_iv.bcast_own,
* &batadv_orig_ifinfo_bat_iv.bcast_own_sum,
* &batadv_neigh_ifinfo_bat_iv.bat_iv.real_bits and
* &batadv_neigh_ifinfo_bat_iv.real_packet_count
*/
spinlock_t ogm_cnt_lock;
};
/**
* struct batadv_orig_node - structure for orig_list maintaining nodes of mesh
*/
struct batadv_orig_node {
/** @orig: originator ethernet address */
u8 orig[ETH_ALEN];
/** @ifinfo_list: list for routers per outgoing interface */
struct hlist_head ifinfo_list;
/**
* @last_bonding_candidate: pointer to last ifinfo of last used router
*/
struct batadv_orig_ifinfo *last_bonding_candidate;
#ifdef CONFIG_BATMAN_ADV_DAT
/** @dat_addr: address of the orig node in the distributed hash */
batadv_dat_addr_t dat_addr;
#endif
/** @last_seen: time when last packet from this node was received */
unsigned long last_seen;
/**
* @bcast_seqno_reset: time when the broadcast seqno window was reset
*/
unsigned long bcast_seqno_reset;
#ifdef CONFIG_BATMAN_ADV_MCAST
/**
* @mcast_handler_lock: synchronizes mcast-capability and -flag changes
*/
spinlock_t mcast_handler_lock;
/** @mcast_flags: multicast flags announced by the orig node */
u8 mcast_flags;
/**
* @mcast_want_all_unsnoopables_node: a list node for the
* mcast.want_all_unsnoopables list
*/
struct hlist_node mcast_want_all_unsnoopables_node;
/**
* @mcast_want_all_ipv4_node: a list node for the mcast.want_all_ipv4
* list
*/
batman-adv: Send multicast packets to nodes with a WANT_ALL flag With this patch a node sends IPv4 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV4 flag set and IPv6 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV6 flag set, too. Why is this needed? There are scenarios involving bridges where multicast report snooping and multicast TT announcements are not sufficient, which would lead to packet loss for some nodes otherwise: MLDv1 and IGMPv1/IGMPv2 have a suppression mechanism for multicast listener reports. When we have an MLDv1/IGMPv1/IGMPv2 querier behind a bridge then our snooping bridge is potentially not going to see any reports even though listeners exist because according to RFC4541 such reports are only forwarded to multicast routers: ----------------------------------------------------------- --------------- {Querier}---|Snoop. Switch|----{Listener} --------------- \ ^ ------- | br0 | < ??? ------- \ _-~---~_ _-~/ ~-_ ~ batman-adv \-----{Sender} \~_ cloud ~/ -~~__-__-~_/ I) MLDv1 Query: {Querier} -> flooded II) MLDv1 Report: {Listener} -> {Querier} -> br0 cannot detect the {Listener} => Packets from {Sender} need to be forwarded to all detected listeners and MLDv1/IGMPv1/IGMPv2 queriers. ----------------------------------------------------------- Note that we do not need to explicitly forward to MLDv2/IGMPv3 queriers, because these protocols have no report suppression: A bridge has no trouble detecting MLDv2/IGMPv3 listeners. Even though we do not support bridges yet we need to provide the according infrastructure already to not break compatibility later. Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
2014-02-15 16:47:54 +00:00
struct hlist_node mcast_want_all_ipv4_node;
/**
* @mcast_want_all_ipv6_node: a list node for the mcast.want_all_ipv6
* list
*/
batman-adv: Send multicast packets to nodes with a WANT_ALL flag With this patch a node sends IPv4 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV4 flag set and IPv6 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV6 flag set, too. Why is this needed? There are scenarios involving bridges where multicast report snooping and multicast TT announcements are not sufficient, which would lead to packet loss for some nodes otherwise: MLDv1 and IGMPv1/IGMPv2 have a suppression mechanism for multicast listener reports. When we have an MLDv1/IGMPv1/IGMPv2 querier behind a bridge then our snooping bridge is potentially not going to see any reports even though listeners exist because according to RFC4541 such reports are only forwarded to multicast routers: ----------------------------------------------------------- --------------- {Querier}---|Snoop. Switch|----{Listener} --------------- \ ^ ------- | br0 | < ??? ------- \ _-~---~_ _-~/ ~-_ ~ batman-adv \-----{Sender} \~_ cloud ~/ -~~__-__-~_/ I) MLDv1 Query: {Querier} -> flooded II) MLDv1 Report: {Listener} -> {Querier} -> br0 cannot detect the {Listener} => Packets from {Sender} need to be forwarded to all detected listeners and MLDv1/IGMPv1/IGMPv2 queriers. ----------------------------------------------------------- Note that we do not need to explicitly forward to MLDv2/IGMPv3 queriers, because these protocols have no report suppression: A bridge has no trouble detecting MLDv2/IGMPv3 listeners. Even though we do not support bridges yet we need to provide the according infrastructure already to not break compatibility later. Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
2014-02-15 16:47:54 +00:00
struct hlist_node mcast_want_all_ipv6_node;
/**
* @mcast_want_all_rtr4_node: a list node for the mcast.want_all_rtr4
* list
*/
struct hlist_node mcast_want_all_rtr4_node;
/**
* @mcast_want_all_rtr6_node: a list node for the mcast.want_all_rtr6
* list
*/
struct hlist_node mcast_want_all_rtr6_node;
#endif
/** @capabilities: announced capabilities of this originator */
unsigned long capabilities;
/**
* @capa_initialized: bitfield to remember whether a capability was
* initialized
*/
unsigned long capa_initialized;
/** @last_ttvn: last seen translation table version number */
atomic_t last_ttvn;
/** @tt_buff: last tt changeset this node received from the orig node */
unsigned char *tt_buff;
/**
* @tt_buff_len: length of the last tt changeset this node received
* from the orig node
*/
s16 tt_buff_len;
/** @tt_buff_lock: lock that protects tt_buff and tt_buff_len */
spinlock_t tt_buff_lock;
/**
* @tt_lock: prevents from updating the table while reading it. Table
* update is made up by two operations (data structure update and
* metdata -CRC/TTVN-recalculation) and they have to be executed
* atomically in order to avoid another thread to read the
* table/metadata between those.
*/
spinlock_t tt_lock;
/**
* @bcast_bits: bitfield containing the info which payload broadcast
* originated from this orig node this host already has seen (relative
* to last_bcast_seqno)
*/
DECLARE_BITMAP(bcast_bits, BATADV_TQ_LOCAL_WINDOW_SIZE);
/**
* @last_bcast_seqno: last broadcast sequence number received by this
* host
*/
u32 last_bcast_seqno;
/**
* @neigh_list: list of potential next hop neighbor towards this orig
* node
*/
struct hlist_head neigh_list;
/**
* @neigh_list_lock: lock protecting neigh_list, ifinfo_list,
* last_bonding_candidate and router
*/
spinlock_t neigh_list_lock;
/** @hash_entry: hlist node for &batadv_priv.orig_hash */
struct hlist_node hash_entry;
/** @bat_priv: pointer to soft_iface this orig node belongs to */
struct batadv_priv *bat_priv;
/** @bcast_seqno_lock: lock protecting bcast_bits & last_bcast_seqno */
spinlock_t bcast_seqno_lock;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
#ifdef CONFIG_BATMAN_ADV_NC
/** @in_coding_list: list of nodes this orig can hear */
struct list_head in_coding_list;
/** @out_coding_list: list of nodes that can hear this orig */
struct list_head out_coding_list;
/** @in_coding_list_lock: protects in_coding_list */
spinlock_t in_coding_list_lock;
/** @out_coding_list_lock: protects out_coding_list */
spinlock_t out_coding_list_lock;
#endif
/** @fragments: array with heads for fragment chains */
struct batadv_frag_table_entry fragments[BATADV_FRAG_BUFFER_COUNT];
/**
* @vlan_list: a list of orig_node_vlan structs, one per VLAN served by
* the originator represented by this object
*/
struct hlist_head vlan_list;
/** @vlan_list_lock: lock protecting vlan_list */
spinlock_t vlan_list_lock;
/** @bat_iv: B.A.T.M.A.N. IV private structure */
struct batadv_orig_bat_iv bat_iv;
};
/**
* enum batadv_orig_capabilities - orig node capabilities
*/
enum batadv_orig_capabilities {
/**
* @BATADV_ORIG_CAPA_HAS_DAT: orig node has distributed arp table
* enabled
*/
BATADV_ORIG_CAPA_HAS_DAT,
/** @BATADV_ORIG_CAPA_HAS_NC: orig node has network coding enabled */
BATADV_ORIG_CAPA_HAS_NC,
/** @BATADV_ORIG_CAPA_HAS_TT: orig node has tt capability */
BATADV_ORIG_CAPA_HAS_TT,
/**
* @BATADV_ORIG_CAPA_HAS_MCAST: orig node has some multicast capability
* (= orig node announces a tvlv of type BATADV_TVLV_MCAST)
*/
BATADV_ORIG_CAPA_HAS_MCAST,
};
/**
* struct batadv_gw_node - structure for orig nodes announcing gw capabilities
*/
struct batadv_gw_node {
/** @list: list node for &batadv_priv_gw.list */
struct hlist_node list;
/** @orig_node: pointer to corresponding orig node */
struct batadv_orig_node *orig_node;
/** @bandwidth_down: advertised uplink download bandwidth */
u32 bandwidth_down;
/** @bandwidth_up: advertised uplink upload bandwidth */
u32 bandwidth_up;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
};
DECLARE_EWMA(throughput, 10, 8)
/**
* struct batadv_hardif_neigh_node_bat_v - B.A.T.M.A.N. V private neighbor
* information
*/
struct batadv_hardif_neigh_node_bat_v {
/** @throughput: ewma link throughput towards this neighbor */
struct ewma_throughput throughput;
/** @elp_interval: time interval between two ELP transmissions */
u32 elp_interval;
/** @elp_latest_seqno: latest and best known ELP sequence number */
u32 elp_latest_seqno;
/**
* @last_unicast_tx: when the last unicast packet has been sent to this
* neighbor
*/
unsigned long last_unicast_tx;
/** @metric_work: work queue callback item for metric update */
struct work_struct metric_work;
};
/**
* struct batadv_hardif_neigh_node - unique neighbor per hard-interface
*/
struct batadv_hardif_neigh_node {
/** @list: list node for &batadv_hard_iface.neigh_list */
struct hlist_node list;
/** @addr: the MAC address of the neighboring interface */
u8 addr[ETH_ALEN];
/**
* @orig: the address of the originator this neighbor node belongs to
*/
u8 orig[ETH_ALEN];
/** @if_incoming: pointer to incoming hard-interface */
struct batadv_hard_iface *if_incoming;
/** @last_seen: when last packet via this neighbor was received */
unsigned long last_seen;
#ifdef CONFIG_BATMAN_ADV_BATMAN_V
/** @bat_v: B.A.T.M.A.N. V private data */
struct batadv_hardif_neigh_node_bat_v bat_v;
#endif
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in a RCU-safe manner */
struct rcu_head rcu;
};
/**
* struct batadv_neigh_node - structure for single hops neighbors
*/
struct batadv_neigh_node {
/** @list: list node for &batadv_orig_node.neigh_list */
struct hlist_node list;
/** @orig_node: pointer to corresponding orig_node */
struct batadv_orig_node *orig_node;
/** @addr: the MAC address of the neighboring interface */
u8 addr[ETH_ALEN];
/** @ifinfo_list: list for routing metrics per outgoing interface */
struct hlist_head ifinfo_list;
/** @ifinfo_lock: lock protecting ifinfo_list and its members */
spinlock_t ifinfo_lock;
/** @if_incoming: pointer to incoming hard-interface */
struct batadv_hard_iface *if_incoming;
/** @last_seen: when last packet via this neighbor was received */
unsigned long last_seen;
/** @hardif_neigh: hardif_neigh of this neighbor */
struct batadv_hardif_neigh_node *hardif_neigh;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
};
/**
* struct batadv_neigh_ifinfo_bat_iv - neighbor information per outgoing
* interface for B.A.T.M.A.N. IV
*/
struct batadv_neigh_ifinfo_bat_iv {
/** @tq_recv: ring buffer of received TQ values from this neigh node */
u8 tq_recv[BATADV_TQ_GLOBAL_WINDOW_SIZE];
/** @tq_index: ring buffer index */
u8 tq_index;
/**
* @tq_avg: averaged tq of all tq values in the ring buffer (tq_recv)
*/
u8 tq_avg;
/**
* @real_bits: bitfield containing the number of OGMs received from this
* neigh node (relative to orig_node->last_real_seqno)
*/
DECLARE_BITMAP(real_bits, BATADV_TQ_LOCAL_WINDOW_SIZE);
/** @real_packet_count: counted result of real_bits */
u8 real_packet_count;
};
/**
* struct batadv_neigh_ifinfo_bat_v - neighbor information per outgoing
* interface for B.A.T.M.A.N. V
*/
struct batadv_neigh_ifinfo_bat_v {
/**
* @throughput: last throughput metric received from originator via this
* neigh
*/
u32 throughput;
/** @last_seqno: last sequence number known for this neighbor */
u32 last_seqno;
};
/**
* struct batadv_neigh_ifinfo - neighbor information per outgoing interface
*/
struct batadv_neigh_ifinfo {
/** @list: list node for &batadv_neigh_node.ifinfo_list */
struct hlist_node list;
/** @if_outgoing: pointer to outgoing hard-interface */
struct batadv_hard_iface *if_outgoing;
/** @bat_iv: B.A.T.M.A.N. IV private structure */
struct batadv_neigh_ifinfo_bat_iv bat_iv;
#ifdef CONFIG_BATMAN_ADV_BATMAN_V
/** @bat_v: B.A.T.M.A.N. V private data */
struct batadv_neigh_ifinfo_bat_v bat_v;
#endif
/** @last_ttl: last received ttl from this neigh node */
u8 last_ttl;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in a RCU-safe manner */
struct rcu_head rcu;
};
#ifdef CONFIG_BATMAN_ADV_BLA
/**
* struct batadv_bcast_duplist_entry - structure for LAN broadcast suppression
*/
struct batadv_bcast_duplist_entry {
/** @orig: mac address of orig node orginating the broadcast */
u8 orig[ETH_ALEN];
/** @crc: crc32 checksum of broadcast payload */
__be32 crc;
/** @entrytime: time when the broadcast packet was received */
unsigned long entrytime;
};
#endif
/**
* enum batadv_counters - indices for traffic counters
*/
enum batadv_counters {
/** @BATADV_CNT_TX: transmitted payload traffic packet counter */
BATADV_CNT_TX,
/** @BATADV_CNT_TX_BYTES: transmitted payload traffic bytes counter */
BATADV_CNT_TX_BYTES,
/**
* @BATADV_CNT_TX_DROPPED: dropped transmission payload traffic packet
* counter
*/
BATADV_CNT_TX_DROPPED,
/** @BATADV_CNT_RX: received payload traffic packet counter */
BATADV_CNT_RX,
/** @BATADV_CNT_RX_BYTES: received payload traffic bytes counter */
BATADV_CNT_RX_BYTES,
/** @BATADV_CNT_FORWARD: forwarded payload traffic packet counter */
BATADV_CNT_FORWARD,
/**
* @BATADV_CNT_FORWARD_BYTES: forwarded payload traffic bytes counter
*/
BATADV_CNT_FORWARD_BYTES,
/**
* @BATADV_CNT_MGMT_TX: transmitted routing protocol traffic packet
* counter
*/
BATADV_CNT_MGMT_TX,
/**
* @BATADV_CNT_MGMT_TX_BYTES: transmitted routing protocol traffic bytes
* counter
*/
BATADV_CNT_MGMT_TX_BYTES,
/**
* @BATADV_CNT_MGMT_RX: received routing protocol traffic packet counter
*/
BATADV_CNT_MGMT_RX,
/**
* @BATADV_CNT_MGMT_RX_BYTES: received routing protocol traffic bytes
* counter
*/
BATADV_CNT_MGMT_RX_BYTES,
/** @BATADV_CNT_FRAG_TX: transmitted fragment traffic packet counter */
BATADV_CNT_FRAG_TX,
/**
* @BATADV_CNT_FRAG_TX_BYTES: transmitted fragment traffic bytes counter
*/
BATADV_CNT_FRAG_TX_BYTES,
/** @BATADV_CNT_FRAG_RX: received fragment traffic packet counter */
BATADV_CNT_FRAG_RX,
/**
* @BATADV_CNT_FRAG_RX_BYTES: received fragment traffic bytes counter
*/
BATADV_CNT_FRAG_RX_BYTES,
/** @BATADV_CNT_FRAG_FWD: forwarded fragment traffic packet counter */
BATADV_CNT_FRAG_FWD,
/**
* @BATADV_CNT_FRAG_FWD_BYTES: forwarded fragment traffic bytes counter
*/
BATADV_CNT_FRAG_FWD_BYTES,
/**
* @BATADV_CNT_TT_REQUEST_TX: transmitted tt req traffic packet counter
*/
BATADV_CNT_TT_REQUEST_TX,
/** @BATADV_CNT_TT_REQUEST_RX: received tt req traffic packet counter */
BATADV_CNT_TT_REQUEST_RX,
/**
* @BATADV_CNT_TT_RESPONSE_TX: transmitted tt resp traffic packet
* counter
*/
BATADV_CNT_TT_RESPONSE_TX,
/**
* @BATADV_CNT_TT_RESPONSE_RX: received tt resp traffic packet counter
*/
BATADV_CNT_TT_RESPONSE_RX,
/**
* @BATADV_CNT_TT_ROAM_ADV_TX: transmitted tt roam traffic packet
* counter
*/
BATADV_CNT_TT_ROAM_ADV_TX,
/**
* @BATADV_CNT_TT_ROAM_ADV_RX: received tt roam traffic packet counter
*/
BATADV_CNT_TT_ROAM_ADV_RX,
#ifdef CONFIG_BATMAN_ADV_DAT
/**
* @BATADV_CNT_DAT_GET_TX: transmitted dht GET traffic packet counter
*/
BATADV_CNT_DAT_GET_TX,
/** @BATADV_CNT_DAT_GET_RX: received dht GET traffic packet counter */
BATADV_CNT_DAT_GET_RX,
/**
* @BATADV_CNT_DAT_PUT_TX: transmitted dht PUT traffic packet counter
*/
BATADV_CNT_DAT_PUT_TX,
/** @BATADV_CNT_DAT_PUT_RX: received dht PUT traffic packet counter */
BATADV_CNT_DAT_PUT_RX,
/**
* @BATADV_CNT_DAT_CACHED_REPLY_TX: transmitted dat cache reply traffic
* packet counter
*/
BATADV_CNT_DAT_CACHED_REPLY_TX,
#endif
#ifdef CONFIG_BATMAN_ADV_NC
/**
* @BATADV_CNT_NC_CODE: transmitted nc-combined traffic packet counter
*/
BATADV_CNT_NC_CODE,
/**
* @BATADV_CNT_NC_CODE_BYTES: transmitted nc-combined traffic bytes
* counter
*/
BATADV_CNT_NC_CODE_BYTES,
/**
* @BATADV_CNT_NC_RECODE: transmitted nc-recombined traffic packet
* counter
*/
BATADV_CNT_NC_RECODE,
/**
* @BATADV_CNT_NC_RECODE_BYTES: transmitted nc-recombined traffic bytes
* counter
*/
BATADV_CNT_NC_RECODE_BYTES,
/**
* @BATADV_CNT_NC_BUFFER: counter for packets buffered for later nc
* decoding
*/
BATADV_CNT_NC_BUFFER,
/**
* @BATADV_CNT_NC_DECODE: received and nc-decoded traffic packet counter
*/
BATADV_CNT_NC_DECODE,
/**
* @BATADV_CNT_NC_DECODE_BYTES: received and nc-decoded traffic bytes
* counter
*/
BATADV_CNT_NC_DECODE_BYTES,
/**
* @BATADV_CNT_NC_DECODE_FAILED: received and decode-failed traffic
* packet counter
*/
BATADV_CNT_NC_DECODE_FAILED,
/**
* @BATADV_CNT_NC_SNIFFED: counter for nc-decoded packets received in
* promisc mode.
*/
BATADV_CNT_NC_SNIFFED,
#endif
/** @BATADV_CNT_NUM: number of traffic counters */
BATADV_CNT_NUM,
};
/**
* struct batadv_priv_tt - per mesh interface translation table data
*/
struct batadv_priv_tt {
/** @vn: translation table version number */
atomic_t vn;
/**
* @ogm_append_cnt: counter of number of OGMs containing the local tt
* diff
*/
atomic_t ogm_append_cnt;
/** @local_changes: changes registered in an originator interval */
atomic_t local_changes;
/**
* @changes_list: tracks tt local changes within an originator interval
*/
struct list_head changes_list;
/** @local_hash: local translation table hash table */
struct batadv_hashtable *local_hash;
/** @global_hash: global translation table hash table */
struct batadv_hashtable *global_hash;
/** @req_list: list of pending & unanswered tt_requests */
struct hlist_head req_list;
/**
* @roam_list: list of the last roaming events of each client limiting
* the number of roaming events to avoid route flapping
*/
struct list_head roam_list;
/** @changes_list_lock: lock protecting changes_list */
spinlock_t changes_list_lock;
/** @req_list_lock: lock protecting req_list */
spinlock_t req_list_lock;
/** @roam_list_lock: lock protecting roam_list */
spinlock_t roam_list_lock;
/** @last_changeset: last tt changeset this host has generated */
unsigned char *last_changeset;
/**
* @last_changeset_len: length of last tt changeset this host has
* generated
*/
s16 last_changeset_len;
/**
* @last_changeset_lock: lock protecting last_changeset &
* last_changeset_len
*/
spinlock_t last_changeset_lock;
/**
* @commit_lock: prevents from executing a local TT commit while reading
* the local table. The local TT commit is made up by two operations
* (data structure update and metdata -CRC/TTVN- recalculation) and
* they have to be executed atomically in order to avoid another thread
* to read the table/metadata between those.
*/
spinlock_t commit_lock;
/** @work: work queue callback item for translation table purging */
struct delayed_work work;
};
#ifdef CONFIG_BATMAN_ADV_BLA
/**
* struct batadv_priv_bla - per mesh interface bridge loope avoidance data
*/
struct batadv_priv_bla {
/** @num_requests: number of bla requests in flight */
atomic_t num_requests;
/**
* @claim_hash: hash table containing mesh nodes this host has claimed
*/
struct batadv_hashtable *claim_hash;
/**
* @backbone_hash: hash table containing all detected backbone gateways
*/
struct batadv_hashtable *backbone_hash;
/** @loopdetect_addr: MAC address used for own loopdetection frames */
u8 loopdetect_addr[ETH_ALEN];
/**
* @loopdetect_lasttime: time when the loopdetection frames were sent
*/
unsigned long loopdetect_lasttime;
/**
* @loopdetect_next: how many periods to wait for the next loopdetect
* process
*/
atomic_t loopdetect_next;
/**
* @bcast_duplist: recently received broadcast packets array (for
* broadcast duplicate suppression)
*/
struct batadv_bcast_duplist_entry bcast_duplist[BATADV_DUPLIST_SIZE];
/**
* @bcast_duplist_curr: index of last broadcast packet added to
* bcast_duplist
*/
int bcast_duplist_curr;
/**
* @bcast_duplist_lock: lock protecting bcast_duplist &
* bcast_duplist_curr
*/
spinlock_t bcast_duplist_lock;
/** @claim_dest: local claim data (e.g. claim group) */
struct batadv_bla_claim_dst claim_dest;
/** @work: work queue callback item for cleanups & bla announcements */
struct delayed_work work;
};
#endif
#ifdef CONFIG_BATMAN_ADV_DEBUG
/**
* struct batadv_priv_debug_log - debug logging data
*/
struct batadv_priv_debug_log {
/** @log_buff: buffer holding the logs (ring bufer) */
char log_buff[BATADV_LOG_BUF_LEN];
/** @log_start: index of next character to read */
unsigned long log_start;
/** @log_end: index of next character to write */
unsigned long log_end;
/** @lock: lock protecting log_buff, log_start & log_end */
spinlock_t lock;
/** @queue_wait: log reader's wait queue */
wait_queue_head_t queue_wait;
};
#endif
/**
* struct batadv_priv_gw - per mesh interface gateway data
*/
struct batadv_priv_gw {
/** @gateway_list: list of available gateway nodes */
struct hlist_head gateway_list;
/** @list_lock: lock protecting gateway_list, curr_gw, generation */
spinlock_t list_lock;
/** @curr_gw: pointer to currently selected gateway node */
struct batadv_gw_node __rcu *curr_gw;
/** @generation: current (generation) sequence number */
unsigned int generation;
/**
* @mode: gateway operation: off, client or server (see batadv_gw_modes)
*/
atomic_t mode;
/** @sel_class: gateway selection class (applies if gw_mode client) */
atomic_t sel_class;
/**
* @bandwidth_down: advertised uplink download bandwidth (if gw_mode
* server)
*/
atomic_t bandwidth_down;
/**
* @bandwidth_up: advertised uplink upload bandwidth (if gw_mode server)
*/
atomic_t bandwidth_up;
/** @reselect: bool indicating a gateway re-selection is in progress */
atomic_t reselect;
};
/**
* struct batadv_priv_tvlv - per mesh interface tvlv data
*/
struct batadv_priv_tvlv {
/**
* @container_list: list of registered tvlv containers to be sent with
* each OGM
*/
struct hlist_head container_list;
/** @handler_list: list of the various tvlv content handlers */
struct hlist_head handler_list;
/** @container_list_lock: protects tvlv container list access */
spinlock_t container_list_lock;
/** @handler_list_lock: protects handler list access */
spinlock_t handler_list_lock;
};
#ifdef CONFIG_BATMAN_ADV_DAT
/**
* struct batadv_priv_dat - per mesh interface DAT private data
*/
struct batadv_priv_dat {
/** @addr: node DAT address */
batadv_dat_addr_t addr;
/** @hash: hashtable representing the local ARP cache */
struct batadv_hashtable *hash;
/** @work: work queue callback item for cache purging */
struct delayed_work work;
};
#endif
#ifdef CONFIG_BATMAN_ADV_MCAST
/**
* struct batadv_mcast_querier_state - IGMP/MLD querier state when bridged
*/
struct batadv_mcast_querier_state {
/** @exists: whether a querier exists in the mesh */
unsigned char exists:1;
/**
* @shadowing: if a querier exists, whether it is potentially shadowing
* multicast listeners (i.e. querier is behind our own bridge segment)
*/
unsigned char shadowing:1;
};
/**
* struct batadv_mcast_mla_flags - flags for the querier, bridge and tvlv state
*/
struct batadv_mcast_mla_flags {
/** @querier_ipv4: the current state of an IGMP querier in the mesh */
struct batadv_mcast_querier_state querier_ipv4;
/** @querier_ipv6: the current state of an MLD querier in the mesh */
struct batadv_mcast_querier_state querier_ipv6;
/** @enabled: whether the multicast tvlv is currently enabled */
unsigned char enabled:1;
/** @bridged: whether the soft interface has a bridge on top */
unsigned char bridged:1;
/** @tvlv_flags: the flags we have last sent in our mcast tvlv */
u8 tvlv_flags;
};
/**
* struct batadv_priv_mcast - per mesh interface mcast data
*/
struct batadv_priv_mcast {
/**
* @mla_list: list of multicast addresses we are currently announcing
* via TT
*/
struct hlist_head mla_list; /* see __batadv_mcast_mla_update() */
/**
* @want_all_unsnoopables_list: a list of orig_nodes wanting all
* unsnoopable multicast traffic
*/
struct hlist_head want_all_unsnoopables_list;
/**
* @want_all_ipv4_list: a list of orig_nodes wanting all IPv4 multicast
* traffic
*/
batman-adv: Send multicast packets to nodes with a WANT_ALL flag With this patch a node sends IPv4 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV4 flag set and IPv6 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV6 flag set, too. Why is this needed? There are scenarios involving bridges where multicast report snooping and multicast TT announcements are not sufficient, which would lead to packet loss for some nodes otherwise: MLDv1 and IGMPv1/IGMPv2 have a suppression mechanism for multicast listener reports. When we have an MLDv1/IGMPv1/IGMPv2 querier behind a bridge then our snooping bridge is potentially not going to see any reports even though listeners exist because according to RFC4541 such reports are only forwarded to multicast routers: ----------------------------------------------------------- --------------- {Querier}---|Snoop. Switch|----{Listener} --------------- \ ^ ------- | br0 | < ??? ------- \ _-~---~_ _-~/ ~-_ ~ batman-adv \-----{Sender} \~_ cloud ~/ -~~__-__-~_/ I) MLDv1 Query: {Querier} -> flooded II) MLDv1 Report: {Listener} -> {Querier} -> br0 cannot detect the {Listener} => Packets from {Sender} need to be forwarded to all detected listeners and MLDv1/IGMPv1/IGMPv2 queriers. ----------------------------------------------------------- Note that we do not need to explicitly forward to MLDv2/IGMPv3 queriers, because these protocols have no report suppression: A bridge has no trouble detecting MLDv2/IGMPv3 listeners. Even though we do not support bridges yet we need to provide the according infrastructure already to not break compatibility later. Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
2014-02-15 16:47:54 +00:00
struct hlist_head want_all_ipv4_list;
/**
* @want_all_ipv6_list: a list of orig_nodes wanting all IPv6 multicast
* traffic
*/
batman-adv: Send multicast packets to nodes with a WANT_ALL flag With this patch a node sends IPv4 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV4 flag set and IPv6 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV6 flag set, too. Why is this needed? There are scenarios involving bridges where multicast report snooping and multicast TT announcements are not sufficient, which would lead to packet loss for some nodes otherwise: MLDv1 and IGMPv1/IGMPv2 have a suppression mechanism for multicast listener reports. When we have an MLDv1/IGMPv1/IGMPv2 querier behind a bridge then our snooping bridge is potentially not going to see any reports even though listeners exist because according to RFC4541 such reports are only forwarded to multicast routers: ----------------------------------------------------------- --------------- {Querier}---|Snoop. Switch|----{Listener} --------------- \ ^ ------- | br0 | < ??? ------- \ _-~---~_ _-~/ ~-_ ~ batman-adv \-----{Sender} \~_ cloud ~/ -~~__-__-~_/ I) MLDv1 Query: {Querier} -> flooded II) MLDv1 Report: {Listener} -> {Querier} -> br0 cannot detect the {Listener} => Packets from {Sender} need to be forwarded to all detected listeners and MLDv1/IGMPv1/IGMPv2 queriers. ----------------------------------------------------------- Note that we do not need to explicitly forward to MLDv2/IGMPv3 queriers, because these protocols have no report suppression: A bridge has no trouble detecting MLDv2/IGMPv3 listeners. Even though we do not support bridges yet we need to provide the according infrastructure already to not break compatibility later. Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
2014-02-15 16:47:54 +00:00
struct hlist_head want_all_ipv6_list;
/**
* @want_all_rtr4_list: a list of orig_nodes wanting all routable IPv4
* multicast traffic
*/
struct hlist_head want_all_rtr4_list;
/**
* @want_all_rtr6_list: a list of orig_nodes wanting all routable IPv6
* multicast traffic
*/
struct hlist_head want_all_rtr6_list;
/**
* @mla_flags: flags for the querier, bridge and tvlv state
*/
struct batadv_mcast_mla_flags mla_flags;
/**
* @mla_lock: a lock protecting mla_list and mla_flags
*/
spinlock_t mla_lock;
/**
* @num_want_all_unsnoopables: number of nodes wanting unsnoopable IP
* traffic
*/
atomic_t num_want_all_unsnoopables;
/** @num_want_all_ipv4: counter for items in want_all_ipv4_list */
batman-adv: Send multicast packets to nodes with a WANT_ALL flag With this patch a node sends IPv4 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV4 flag set and IPv6 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV6 flag set, too. Why is this needed? There are scenarios involving bridges where multicast report snooping and multicast TT announcements are not sufficient, which would lead to packet loss for some nodes otherwise: MLDv1 and IGMPv1/IGMPv2 have a suppression mechanism for multicast listener reports. When we have an MLDv1/IGMPv1/IGMPv2 querier behind a bridge then our snooping bridge is potentially not going to see any reports even though listeners exist because according to RFC4541 such reports are only forwarded to multicast routers: ----------------------------------------------------------- --------------- {Querier}---|Snoop. Switch|----{Listener} --------------- \ ^ ------- | br0 | < ??? ------- \ _-~---~_ _-~/ ~-_ ~ batman-adv \-----{Sender} \~_ cloud ~/ -~~__-__-~_/ I) MLDv1 Query: {Querier} -> flooded II) MLDv1 Report: {Listener} -> {Querier} -> br0 cannot detect the {Listener} => Packets from {Sender} need to be forwarded to all detected listeners and MLDv1/IGMPv1/IGMPv2 queriers. ----------------------------------------------------------- Note that we do not need to explicitly forward to MLDv2/IGMPv3 queriers, because these protocols have no report suppression: A bridge has no trouble detecting MLDv2/IGMPv3 listeners. Even though we do not support bridges yet we need to provide the according infrastructure already to not break compatibility later. Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
2014-02-15 16:47:54 +00:00
atomic_t num_want_all_ipv4;
/** @num_want_all_ipv6: counter for items in want_all_ipv6_list */
batman-adv: Send multicast packets to nodes with a WANT_ALL flag With this patch a node sends IPv4 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV4 flag set and IPv6 multicast packets to nodes which have a BATADV_MCAST_WANT_ALL_IPV6 flag set, too. Why is this needed? There are scenarios involving bridges where multicast report snooping and multicast TT announcements are not sufficient, which would lead to packet loss for some nodes otherwise: MLDv1 and IGMPv1/IGMPv2 have a suppression mechanism for multicast listener reports. When we have an MLDv1/IGMPv1/IGMPv2 querier behind a bridge then our snooping bridge is potentially not going to see any reports even though listeners exist because according to RFC4541 such reports are only forwarded to multicast routers: ----------------------------------------------------------- --------------- {Querier}---|Snoop. Switch|----{Listener} --------------- \ ^ ------- | br0 | < ??? ------- \ _-~---~_ _-~/ ~-_ ~ batman-adv \-----{Sender} \~_ cloud ~/ -~~__-__-~_/ I) MLDv1 Query: {Querier} -> flooded II) MLDv1 Report: {Listener} -> {Querier} -> br0 cannot detect the {Listener} => Packets from {Sender} need to be forwarded to all detected listeners and MLDv1/IGMPv1/IGMPv2 queriers. ----------------------------------------------------------- Note that we do not need to explicitly forward to MLDv2/IGMPv3 queriers, because these protocols have no report suppression: A bridge has no trouble detecting MLDv2/IGMPv3 listeners. Even though we do not support bridges yet we need to provide the according infrastructure already to not break compatibility later. Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
2014-02-15 16:47:54 +00:00
atomic_t num_want_all_ipv6;
/** @num_want_all_rtr4: counter for items in want_all_rtr4_list */
atomic_t num_want_all_rtr4;
/** @num_want_all_rtr6: counter for items in want_all_rtr6_list */
atomic_t num_want_all_rtr6;
/**
* @want_lists_lock: lock for protecting modifications to mcasts
* want_all_{unsnoopables,ipv4,ipv6}_list (traversals are rcu-locked)
*/
spinlock_t want_lists_lock;
/** @work: work queue callback item for multicast TT and TVLV updates */
struct delayed_work work;
};
#endif
batman-adv: network coding - add the initial infrastructure code Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/Catwoman Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-01-25 10:12:38 +00:00
/**
* struct batadv_priv_nc - per mesh interface network coding private data
*/
struct batadv_priv_nc {
/** @work: work queue callback item for cleanup */
batman-adv: network coding - add the initial infrastructure code Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/Catwoman Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-01-25 10:12:38 +00:00
struct delayed_work work;
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
/**
* @debug_dir: dentry for nc subdir in batman-adv directory in debugfs
*/
struct dentry *debug_dir;
#endif
/**
* @min_tq: only consider neighbors for encoding if neigh_tq > min_tq
*/
u8 min_tq;
/**
* @max_fwd_delay: maximum packet forward delay to allow coding of
* packets
*/
u32 max_fwd_delay;
/**
* @max_buffer_time: buffer time for sniffed packets used to decoding
*/
u32 max_buffer_time;
/**
* @timestamp_fwd_flush: timestamp of last forward packet queue flush
*/
unsigned long timestamp_fwd_flush;
/**
* @timestamp_sniffed_purge: timestamp of last sniffed packet queue
* purge
*/
unsigned long timestamp_sniffed_purge;
/**
* @coding_hash: Hash table used to buffer skbs while waiting for
* another incoming skb to code it with. Skbs are added to the buffer
* just before being forwarded in routing.c
*/
struct batadv_hashtable *coding_hash;
/**
* @decoding_hash: Hash table used to buffer skbs that might be needed
* to decode a received coded skb. The buffer is used for 1) skbs
* arriving on the soft-interface; 2) skbs overheard on the
* hard-interface; and 3) skbs forwarded by batman-adv.
*/
struct batadv_hashtable *decoding_hash;
batman-adv: network coding - add the initial infrastructure code Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/Catwoman Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-01-25 10:12:38 +00:00
};
/**
* struct batadv_tp_unacked - unacked packet meta-information
*
* This struct is supposed to represent a buffer unacked packet. However, since
* the purpose of the TP meter is to count the traffic only, there is no need to
* store the entire sk_buff, the starting offset and the length are enough
*/
struct batadv_tp_unacked {
/** @seqno: seqno of the unacked packet */
u32 seqno;
/** @len: length of the packet */
u16 len;
/** @list: list node for &batadv_tp_vars.unacked_list */
struct list_head list;
};
/**
* enum batadv_tp_meter_role - Modus in tp meter session
*/
enum batadv_tp_meter_role {
/** @BATADV_TP_RECEIVER: Initialized as receiver */
BATADV_TP_RECEIVER,
/** @BATADV_TP_SENDER: Initialized as sender */
BATADV_TP_SENDER
};
/**
* struct batadv_tp_vars - tp meter private variables per session
*/
struct batadv_tp_vars {
/** @list: list node for &bat_priv.tp_list */
struct hlist_node list;
/** @timer: timer for ack (receiver) and retry (sender) */
struct timer_list timer;
/** @bat_priv: pointer to the mesh object */
struct batadv_priv *bat_priv;
/** @start_time: start time in jiffies */
unsigned long start_time;
/** @other_end: mac address of remote */
u8 other_end[ETH_ALEN];
/** @role: receiver/sender modi */
enum batadv_tp_meter_role role;
/** @sending: sending binary semaphore: 1 if sending, 0 is not */
atomic_t sending;
/** @reason: reason for a stopped session */
enum batadv_tp_meter_reason reason;
/** @finish_work: work item for the finishing procedure */
struct delayed_work finish_work;
/** @test_length: test length in milliseconds */
u32 test_length;
/** @session: TP session identifier */
u8 session[2];
/** @icmp_uid: local ICMP "socket" index */
u8 icmp_uid;
/* sender variables */
/** @dec_cwnd: decimal part of the cwnd used during linear growth */
u16 dec_cwnd;
/** @cwnd: current size of the congestion window */
u32 cwnd;
/** @cwnd_lock: lock do protect @cwnd & @dec_cwnd */
spinlock_t cwnd_lock;
/**
* @ss_threshold: Slow Start threshold. Once cwnd exceeds this value the
* connection switches to the Congestion Avoidance state
*/
u32 ss_threshold;
/** @last_acked: last acked byte */
atomic_t last_acked;
/** @last_sent: last sent byte, not yet acked */
u32 last_sent;
/** @tot_sent: amount of data sent/ACKed so far */
atomic64_t tot_sent;
/** @dup_acks: duplicate ACKs counter */
atomic_t dup_acks;
/** @fast_recovery: true if in Fast Recovery mode */
unsigned char fast_recovery:1;
/** @recover: last sent seqno when entering Fast Recovery */
u32 recover;
/** @rto: sender timeout */
u32 rto;
/** @srtt: smoothed RTT scaled by 2^3 */
u32 srtt;
/** @rttvar: RTT variation scaled by 2^2 */
u32 rttvar;
/**
* @more_bytes: waiting queue anchor when waiting for more ack/retry
* timeout
*/
wait_queue_head_t more_bytes;
/** @prerandom_offset: offset inside the prerandom buffer */
u32 prerandom_offset;
/** @prerandom_lock: spinlock protecting access to prerandom_offset */
spinlock_t prerandom_lock;
/* receiver variables */
/** @last_recv: last in-order received packet */
u32 last_recv;
/** @unacked_list: list of unacked packets (meta-info only) */
struct list_head unacked_list;
/** @unacked_lock: protect unacked_list */
spinlock_t unacked_lock;
/** @last_recv_time: time time (jiffies) a msg was received */
unsigned long last_recv_time;
/** @refcount: number of context where the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
};
/**
* struct batadv_softif_vlan - per VLAN attributes set
*/
struct batadv_softif_vlan {
/** @bat_priv: pointer to the mesh object */
struct batadv_priv *bat_priv;
/** @vid: VLAN identifier */
unsigned short vid;
/** @kobj: kobject for sysfs vlan subdirectory */
struct kobject *kobj;
/** @ap_isolation: AP isolation state */
atomic_t ap_isolation; /* boolean */
/** @tt: TT private attributes (VLAN specific) */
struct batadv_vlan_tt tt;
/** @list: list node for &bat_priv.softif_vlan_list */
struct hlist_node list;
/**
* @refcount: number of context where this object is currently in use
*/
struct kref refcount;
/** @rcu: struct used for freeing in a RCU-safe manner */
struct rcu_head rcu;
};
/**
* struct batadv_priv_bat_v - B.A.T.M.A.N. V per soft-interface private data
*/
struct batadv_priv_bat_v {
/** @ogm_buff: buffer holding the OGM packet */
unsigned char *ogm_buff;
/** @ogm_buff_len: length of the OGM packet buffer */
int ogm_buff_len;
/** @ogm_seqno: OGM sequence number - used to identify each OGM */
atomic_t ogm_seqno;
/** @ogm_wq: workqueue used to schedule OGM transmissions */
struct delayed_work ogm_wq;
};
/**
* struct batadv_priv - per mesh interface data
*/
struct batadv_priv {
/**
* @mesh_state: current status of the mesh
* (inactive/active/deactivating)
*/
atomic_t mesh_state;
/** @soft_iface: net device which holds this struct as private data */
struct net_device *soft_iface;
/**
* @bat_counters: mesh internal traffic statistic counters (see
* batadv_counters)
*/
u64 __percpu *bat_counters; /* Per cpu counters */
/**
* @aggregated_ogms: bool indicating whether OGM aggregation is enabled
*/
atomic_t aggregated_ogms;
/** @bonding: bool indicating whether traffic bonding is enabled */
atomic_t bonding;
/**
* @fragmentation: bool indicating whether traffic fragmentation is
* enabled
*/
atomic_t fragmentation;
/**
* @packet_size_max: max packet size that can be transmitted via
* multiple fragmented skbs or a single frame if fragmentation is
* disabled
*/
atomic_t packet_size_max;
/**
* @frag_seqno: incremental counter to identify chains of egress
* fragments
*/
atomic_t frag_seqno;
#ifdef CONFIG_BATMAN_ADV_BLA
/**
* @bridge_loop_avoidance: bool indicating whether bridge loop
* avoidance is enabled
*/
atomic_t bridge_loop_avoidance;
#endif
#ifdef CONFIG_BATMAN_ADV_DAT
/**
* @distributed_arp_table: bool indicating whether distributed ARP table
* is enabled
*/
atomic_t distributed_arp_table;
#endif
#ifdef CONFIG_BATMAN_ADV_MCAST
/**
* @multicast_mode: Enable or disable multicast optimizations on this
* node's sender/originating side
*/
atomic_t multicast_mode;
/**
* @multicast_fanout: Maximum number of packet copies to generate for a
* multicast-to-unicast conversion
*/
atomic_t multicast_fanout;
#endif
/** @orig_interval: OGM broadcast interval in milliseconds */
atomic_t orig_interval;
/**
* @hop_penalty: penalty which will be applied to an OGM's tq-field on
* every hop
*/
atomic_t hop_penalty;
#ifdef CONFIG_BATMAN_ADV_DEBUG
/** @log_level: configured log level (see batadv_dbg_level) */
atomic_t log_level;
#endif
/**
* @isolation_mark: the skb->mark value used to match packets for AP
* isolation
*/
u32 isolation_mark;
/**
* @isolation_mark_mask: bitmask identifying the bits in skb->mark to be
* used for the isolation mark
*/
u32 isolation_mark_mask;
/** @bcast_seqno: last sent broadcast packet sequence number */
atomic_t bcast_seqno;
/**
* @bcast_queue_left: number of remaining buffered broadcast packet
* slots
*/
atomic_t bcast_queue_left;
/** @batman_queue_left: number of remaining OGM packet slots */
atomic_t batman_queue_left;
/** @mesh_obj: kobject for sysfs mesh subdirectory */
struct kobject *mesh_obj;
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
/** @debug_dir: dentry for debugfs batman-adv subdirectory */
struct dentry *debug_dir;
#endif
/** @forw_bat_list: list of aggregated OGMs that will be forwarded */
struct hlist_head forw_bat_list;
/**
* @forw_bcast_list: list of broadcast packets that will be
* rebroadcasted
*/
struct hlist_head forw_bcast_list;
/** @tp_list: list of tp sessions */
struct hlist_head tp_list;
/** @tp_num: number of currently active tp sessions */
struct batadv_hashtable *orig_hash;
/** @orig_hash: hash table containing mesh participants (orig nodes) */
spinlock_t forw_bat_list_lock;
/** @forw_bat_list_lock: lock protecting forw_bat_list */
spinlock_t forw_bcast_list_lock;
/** @forw_bcast_list_lock: lock protecting forw_bcast_list */
spinlock_t tp_list_lock;
/** @tp_list_lock: spinlock protecting @tp_list */
atomic_t tp_num;
/** @orig_work: work queue callback item for orig node purging */
struct delayed_work orig_work;
/**
* @primary_if: one of the hard-interfaces assigned to this mesh
* interface becomes the primary interface
*/
struct batadv_hard_iface __rcu *primary_if; /* rcu protected pointer */
/** @algo_ops: routing algorithm used by this mesh interface */
struct batadv_algo_ops *algo_ops;
/**
* @softif_vlan_list: a list of softif_vlan structs, one per VLAN
* created on top of the mesh interface represented by this object
*/
struct hlist_head softif_vlan_list;
/** @softif_vlan_list_lock: lock protecting softif_vlan_list */
spinlock_t softif_vlan_list_lock;
#ifdef CONFIG_BATMAN_ADV_BLA
/** @bla: bridge loope avoidance data */
struct batadv_priv_bla bla;
#endif
#ifdef CONFIG_BATMAN_ADV_DEBUG
/** @debug_log: holding debug logging relevant data */
struct batadv_priv_debug_log *debug_log;
#endif
/** @gw: gateway data */
struct batadv_priv_gw gw;
/** @tt: translation table data */
struct batadv_priv_tt tt;
/** @tvlv: type-version-length-value data */
struct batadv_priv_tvlv tvlv;
#ifdef CONFIG_BATMAN_ADV_DAT
/** @dat: distributed arp table data */
struct batadv_priv_dat dat;
#endif
#ifdef CONFIG_BATMAN_ADV_MCAST
/** @mcast: multicast data */
struct batadv_priv_mcast mcast;
#endif
batman-adv: network coding - add the initial infrastructure code Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/Catwoman Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-01-25 10:12:38 +00:00
#ifdef CONFIG_BATMAN_ADV_NC
/**
* @network_coding: bool indicating whether network coding is enabled
*/
batman-adv: network coding - add the initial infrastructure code Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/Catwoman Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-01-25 10:12:38 +00:00
atomic_t network_coding;
/** @nc: network coding data */
batman-adv: network coding - add the initial infrastructure code Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/Catwoman Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-01-25 10:12:38 +00:00
struct batadv_priv_nc nc;
#endif /* CONFIG_BATMAN_ADV_NC */
#ifdef CONFIG_BATMAN_ADV_BATMAN_V
/** @bat_v: B.A.T.M.A.N. V per soft-interface private data */
struct batadv_priv_bat_v bat_v;
#endif
};
/**
* struct batadv_socket_client - layer2 icmp socket client data
*/
struct batadv_socket_client {
/**
* @queue_list: packet queue for packets destined for this socket client
*/
struct list_head queue_list;
/** @queue_len: number of packets in the packet queue (queue_list) */
unsigned int queue_len;
/** @index: socket client's index in the batadv_socket_client_hash */
unsigned char index;
/** @lock: lock protecting queue_list, queue_len & index */
spinlock_t lock;
/** @queue_wait: socket client's wait queue */
wait_queue_head_t queue_wait;
/** @bat_priv: pointer to soft_iface this client belongs to */
struct batadv_priv *bat_priv;
};
/**
* struct batadv_socket_packet - layer2 icmp packet for socket client
*/
struct batadv_socket_packet {
/** @list: list node for &batadv_socket_client.queue_list */
struct list_head list;
/** @icmp_len: size of the layer2 icmp packet */
size_t icmp_len;
/** @icmp_packet: layer2 icmp packet */
u8 icmp_packet[BATADV_ICMP_MAX_PACKET_SIZE];
};
#ifdef CONFIG_BATMAN_ADV_BLA
/**
* struct batadv_bla_backbone_gw - batman-adv gateway bridged into the LAN
*/
struct batadv_bla_backbone_gw {
/**
* @orig: originator address of backbone node (mac address of primary
* iface)
*/
u8 orig[ETH_ALEN];
/** @vid: vlan id this gateway was detected on */
unsigned short vid;
/** @hash_entry: hlist node for &batadv_priv_bla.backbone_hash */
struct hlist_node hash_entry;
/** @bat_priv: pointer to soft_iface this backbone gateway belongs to */
struct batadv_priv *bat_priv;
/** @lasttime: last time we heard of this backbone gw */
unsigned long lasttime;
/**
* @wait_periods: grace time for bridge forward delays and bla group
* forming at bootup phase - no bcast traffic is formwared until it has
* elapsed
*/
atomic_t wait_periods;
/**
* @request_sent: if this bool is set to true we are out of sync with
* this backbone gateway - no bcast traffic is formwared until the
* situation was resolved
*/
atomic_t request_sent;
/** @crc: crc16 checksum over all claims */
u16 crc;
/** @crc_lock: lock protecting crc */
spinlock_t crc_lock;
/** @report_work: work struct for reporting detected loops */
struct work_struct report_work;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
};
/**
* struct batadv_bla_claim - claimed non-mesh client structure
*/
struct batadv_bla_claim {
/** @addr: mac address of claimed non-mesh client */
u8 addr[ETH_ALEN];
/** @vid: vlan id this client was detected on */
unsigned short vid;
/** @backbone_gw: pointer to backbone gw claiming this client */
struct batadv_bla_backbone_gw *backbone_gw;
/** @backbone_lock: lock protecting backbone_gw pointer */
spinlock_t backbone_lock;
/** @lasttime: last time we heard of claim (locals only) */
unsigned long lasttime;
/** @hash_entry: hlist node for &batadv_priv_bla.claim_hash */
struct hlist_node hash_entry;
/** @refcount: number of contexts the object is used */
struct rcu_head rcu;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct kref refcount;
};
#endif
/**
* struct batadv_tt_common_entry - tt local & tt global common data
*/
struct batadv_tt_common_entry {
/** @addr: mac address of non-mesh client */
u8 addr[ETH_ALEN];
/** @vid: VLAN identifier */
unsigned short vid;
/**
* @hash_entry: hlist node for &batadv_priv_tt.local_hash or for
* &batadv_priv_tt.global_hash
*/
struct hlist_node hash_entry;
/** @flags: various state handling flags (see batadv_tt_client_flags) */
u16 flags;
/** @added_at: timestamp used for purging stale tt common entries */
unsigned long added_at;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
};
/**
* struct batadv_tt_local_entry - translation table local entry data
*/
struct batadv_tt_local_entry {
/** @common: general translation table data */
struct batadv_tt_common_entry common;
/** @last_seen: timestamp used for purging stale tt local entries */
unsigned long last_seen;
/** @vlan: soft-interface vlan of the entry */
struct batadv_softif_vlan *vlan;
};
/**
* struct batadv_tt_global_entry - translation table global entry data
*/
struct batadv_tt_global_entry {
/** @common: general translation table data */
struct batadv_tt_common_entry common;
/** @orig_list: list of orig nodes announcing this non-mesh client */
struct hlist_head orig_list;
/** @orig_list_count: number of items in the orig_list */
atomic_t orig_list_count;
/** @list_lock: lock protecting orig_list */
spinlock_t list_lock;
/** @roam_at: time at which TT_GLOBAL_ROAM was set */
unsigned long roam_at;
};
/**
* struct batadv_tt_orig_list_entry - orig node announcing a non-mesh client
*/
struct batadv_tt_orig_list_entry {
/** @orig_node: pointer to orig node announcing this non-mesh client */
struct batadv_orig_node *orig_node;
/**
* @ttvn: translation table version number which added the non-mesh
* client
*/
u8 ttvn;
/** @flags: per orig entry TT sync flags */
batman-adv: fix TT sync flag inconsistencies This patch fixes an issue in the translation table code potentially leading to a TT Request + Response storm. The issue may occur for nodes involving BLA and an inconsistent configuration of the batman-adv AP isolation feature. However, since the new multicast optimizations, a single, malformed packet may lead to a mesh-wide, persistent Denial-of-Service, too. The issue occurs because nodes are currently OR-ing the TT sync flags of all originators announcing a specific MAC address via the translation table. When an intermediate node now receives a TT Request and wants to answer this on behalf of the destination node, then this intermediate node now responds with an altered flag field and broken CRC. The next OGM of the real destination will lead to a CRC mismatch and triggering a TT Request and Response again. Furthermore, the OR-ing is currently never undone as long as at least one originator announcing the according MAC address remains, leading to the potential persistency of this issue. This patch fixes this issue by storing the flags used in the CRC calculation on a a per TT orig entry basis to be able to respond with the correct, original flags in an intermediate TT Response for one thing. And to be able to correctly unset sync flags once all nodes announcing a sync flag vanish for another. Fixes: e9c00136a475 ("batman-adv: fix tt_global_entries flags update") Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Acked-by: Antonio Quartulli <a@unstable.cc> [sw: typo in commit message] Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-07-06 05:02:25 +00:00
u8 flags;
/** @list: list node for &batadv_tt_global_entry.orig_list */
struct hlist_node list;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
};
/**
* struct batadv_tt_change_node - structure for tt changes occurred
*/
struct batadv_tt_change_node {
/** @list: list node for &batadv_priv_tt.changes_list */
batman-adv: improved client announcement mechanism The client announcement mechanism informs every mesh node in the network of any connected non-mesh client, in order to find the path towards that client from any given point in the mesh. The old implementation was based on the simple idea of appending a data buffer to each OGM containing all the client MAC addresses the node is serving. All other nodes can populate their global translation tables (table which links client MAC addresses to node addresses) using this MAC address buffer and linking it to the node's address contained in the OGM. A node that wants to contact a client has to lookup the node the client is connected to and its address in the global translation table. It is easy to understand that this implementation suffers from several issues: - big overhead (each and every OGM contains the entire list of connected clients) - high latencies for client route updates due to long OGM trip time and OGM losses The new implementation addresses these issues by appending client changes (new client joined or a client left) to the OGM instead of filling it with all the client addresses each time. In this way nodes can modify their global tables by means of "updates", thus reducing the overhead within the OGMs. To keep the entire network in sync each node maintains a translation table version number (ttvn) and a translation table checksum. These values are spread with the OGM to allow all the network participants to determine whether or not they need to update their translation table information. When a translation table lookup is performed in order to send a packet to a client attached to another node, the destination's ttvn is added to the payload packet. Forwarding nodes can compare the packet's ttvn with their destination's ttvn (this node could have a fresher information than the source) and re-route the packet if necessary. This greatly reduces the packet loss of clients roaming from one AP to the next. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-04-27 12:27:44 +00:00
struct list_head list;
/** @change: holds the actual translation table diff data */
struct batadv_tvlv_tt_change change;
batman-adv: improved client announcement mechanism The client announcement mechanism informs every mesh node in the network of any connected non-mesh client, in order to find the path towards that client from any given point in the mesh. The old implementation was based on the simple idea of appending a data buffer to each OGM containing all the client MAC addresses the node is serving. All other nodes can populate their global translation tables (table which links client MAC addresses to node addresses) using this MAC address buffer and linking it to the node's address contained in the OGM. A node that wants to contact a client has to lookup the node the client is connected to and its address in the global translation table. It is easy to understand that this implementation suffers from several issues: - big overhead (each and every OGM contains the entire list of connected clients) - high latencies for client route updates due to long OGM trip time and OGM losses The new implementation addresses these issues by appending client changes (new client joined or a client left) to the OGM instead of filling it with all the client addresses each time. In this way nodes can modify their global tables by means of "updates", thus reducing the overhead within the OGMs. To keep the entire network in sync each node maintains a translation table version number (ttvn) and a translation table checksum. These values are spread with the OGM to allow all the network participants to determine whether or not they need to update their translation table information. When a translation table lookup is performed in order to send a packet to a client attached to another node, the destination's ttvn is added to the payload packet. Forwarding nodes can compare the packet's ttvn with their destination's ttvn (this node could have a fresher information than the source) and re-route the packet if necessary. This greatly reduces the packet loss of clients roaming from one AP to the next. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-04-27 12:27:44 +00:00
};
/**
* struct batadv_tt_req_node - data to keep track of the tt requests in flight
*/
struct batadv_tt_req_node {
/**
* @addr: mac address address of the originator this request was sent to
*/
u8 addr[ETH_ALEN];
/** @issued_at: timestamp used for purging stale tt requests */
batman-adv: improved client announcement mechanism The client announcement mechanism informs every mesh node in the network of any connected non-mesh client, in order to find the path towards that client from any given point in the mesh. The old implementation was based on the simple idea of appending a data buffer to each OGM containing all the client MAC addresses the node is serving. All other nodes can populate their global translation tables (table which links client MAC addresses to node addresses) using this MAC address buffer and linking it to the node's address contained in the OGM. A node that wants to contact a client has to lookup the node the client is connected to and its address in the global translation table. It is easy to understand that this implementation suffers from several issues: - big overhead (each and every OGM contains the entire list of connected clients) - high latencies for client route updates due to long OGM trip time and OGM losses The new implementation addresses these issues by appending client changes (new client joined or a client left) to the OGM instead of filling it with all the client addresses each time. In this way nodes can modify their global tables by means of "updates", thus reducing the overhead within the OGMs. To keep the entire network in sync each node maintains a translation table version number (ttvn) and a translation table checksum. These values are spread with the OGM to allow all the network participants to determine whether or not they need to update their translation table information. When a translation table lookup is performed in order to send a packet to a client attached to another node, the destination's ttvn is added to the payload packet. Forwarding nodes can compare the packet's ttvn with their destination's ttvn (this node could have a fresher information than the source) and re-route the packet if necessary. This greatly reduces the packet loss of clients roaming from one AP to the next. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-04-27 12:27:44 +00:00
unsigned long issued_at;
/** @refcount: number of contexts the object is used by */
batman-adv: Fix use-after-free/double-free of tt_req_node The tt_req_node is added and removed from a list inside a spinlock. But the locking is sometimes removed even when the object is still referenced and will be used later via this reference. For example batadv_send_tt_request can create a new tt_req_node (including add to a list) and later re-acquires the lock to remove it from the list and to free it. But at this time another context could have already removed this tt_req_node from the list and freed it. CPU#0 batadv_batman_skb_recv from net_device 0 -> batadv_iv_ogm_receive -> batadv_iv_ogm_process -> batadv_iv_ogm_process_per_outif -> batadv_tvlv_ogm_receive -> batadv_tvlv_ogm_receive -> batadv_tvlv_containers_process -> batadv_tvlv_call_handler -> batadv_tt_tvlv_ogm_handler_v1 -> batadv_tt_update_orig -> batadv_send_tt_request -> batadv_tt_req_node_new spin_lock(...) allocates new tt_req_node and adds it to list spin_unlock(...) return tt_req_node CPU#1 batadv_batman_skb_recv from net_device 1 -> batadv_recv_unicast_tvlv -> batadv_tvlv_containers_process -> batadv_tvlv_call_handler -> batadv_tt_tvlv_unicast_handler_v1 -> batadv_handle_tt_response spin_lock(...) tt_req_node gets removed from list and is freed spin_unlock(...) CPU#0 <- returned to batadv_send_tt_request spin_lock(...) tt_req_node gets removed from list and is freed MEMORY CORRUPTION/SEGFAULT/... spin_unlock(...) This can only be solved via reference counting to allow multiple contexts to handle the list manipulation while making sure that only the last context holding a reference will free the object. Fixes: a73105b8d4c7 ("batman-adv: improved client announcement mechanism") Signed-off-by: Sven Eckelmann <sven@narfation.org> Tested-by: Martin Weinelt <martin@darmstadt.freifunk.net> Tested-by: Amadeus Alfa <amadeus@chemnitz.freifunk.net> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-06-26 09:16:10 +00:00
struct kref refcount;
/** @list: list node for &batadv_priv_tt.req_list */
struct hlist_node list;
batman-adv: improved client announcement mechanism The client announcement mechanism informs every mesh node in the network of any connected non-mesh client, in order to find the path towards that client from any given point in the mesh. The old implementation was based on the simple idea of appending a data buffer to each OGM containing all the client MAC addresses the node is serving. All other nodes can populate their global translation tables (table which links client MAC addresses to node addresses) using this MAC address buffer and linking it to the node's address contained in the OGM. A node that wants to contact a client has to lookup the node the client is connected to and its address in the global translation table. It is easy to understand that this implementation suffers from several issues: - big overhead (each and every OGM contains the entire list of connected clients) - high latencies for client route updates due to long OGM trip time and OGM losses The new implementation addresses these issues by appending client changes (new client joined or a client left) to the OGM instead of filling it with all the client addresses each time. In this way nodes can modify their global tables by means of "updates", thus reducing the overhead within the OGMs. To keep the entire network in sync each node maintains a translation table version number (ttvn) and a translation table checksum. These values are spread with the OGM to allow all the network participants to determine whether or not they need to update their translation table information. When a translation table lookup is performed in order to send a packet to a client attached to another node, the destination's ttvn is added to the payload packet. Forwarding nodes can compare the packet's ttvn with their destination's ttvn (this node could have a fresher information than the source) and re-route the packet if necessary. This greatly reduces the packet loss of clients roaming from one AP to the next. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-04-27 12:27:44 +00:00
};
/**
* struct batadv_tt_roam_node - roaming client data
*/
struct batadv_tt_roam_node {
/** @addr: mac address of the client in the roaming phase */
u8 addr[ETH_ALEN];
/**
* @counter: number of allowed roaming events per client within a single
* OGM interval (changes are committed with each OGM)
*/
atomic_t counter;
/**
* @first_time: timestamp used for purging stale roaming node entries
*/
unsigned long first_time;
/** @list: list node for &batadv_priv_tt.roam_list */
struct list_head list;
};
/**
* struct batadv_nc_node - network coding node
*/
struct batadv_nc_node {
/** @list: next and prev pointer for the list handling */
struct list_head list;
/** @addr: the node's mac address */
u8 addr[ETH_ALEN];
/** @refcount: number of contexts the object is used by */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
/** @orig_node: pointer to corresponding orig node struct */
struct batadv_orig_node *orig_node;
/** @last_seen: timestamp of last ogm received from this node */
unsigned long last_seen;
};
/**
* struct batadv_nc_path - network coding path
*/
struct batadv_nc_path {
/** @hash_entry: next and prev pointer for the list handling */
struct hlist_node hash_entry;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
/** @refcount: number of contexts the object is used by */
struct kref refcount;
/** @packet_list: list of buffered packets for this path */
struct list_head packet_list;
/** @packet_list_lock: access lock for packet list */
spinlock_t packet_list_lock;
/** @next_hop: next hop (destination) of path */
u8 next_hop[ETH_ALEN];
/** @prev_hop: previous hop (source) of path */
u8 prev_hop[ETH_ALEN];
/** @last_valid: timestamp for last validation of path */
unsigned long last_valid;
};
/**
* struct batadv_nc_packet - network coding packet used when coding and
* decoding packets
*/
struct batadv_nc_packet {
/** @list: next and prev pointer for the list handling */
struct list_head list;
/** @packet_id: crc32 checksum of skb data */
__be32 packet_id;
/**
* @timestamp: field containing the info when the packet was added to
* path
*/
unsigned long timestamp;
/** @neigh_node: pointer to original next hop neighbor of skb */
struct batadv_neigh_node *neigh_node;
/** @skb: skb which can be encoded or used for decoding */
struct sk_buff *skb;
/** @nc_path: pointer to path this nc packet is attached to */
struct batadv_nc_path *nc_path;
};
/**
* struct batadv_skb_cb - control buffer structure used to store private data
* relevant to batman-adv in the skb->cb buffer in skbs.
*/
struct batadv_skb_cb {
/**
* @decoded: Marks a skb as decoded, which is checked when searching for
* coding opportunities in network-coding.c
*/
unsigned char decoded:1;
/** @num_bcasts: Counter for broadcast packet retransmissions */
unsigned char num_bcasts;
};
/**
* struct batadv_forw_packet - structure for bcast packets to be sent/forwarded
*/
struct batadv_forw_packet {
/**
* @list: list node for &batadv_priv.forw.bcast_list and
* &batadv_priv.forw.bat_list
*/
struct hlist_node list;
/** @cleanup_list: list node for purging functions */
batman-adv: fix rare race conditions on interface removal In rare cases during shutdown the following general protection fault can happen: general protection fault: 0000 [#1] SMP Modules linked in: batman_adv(O-) [...] CPU: 3 PID: 1714 Comm: rmmod Tainted: G O 4.6.0-rc6+ #1 [...] Call Trace: [<ffffffffa0363294>] batadv_hardif_disable_interface+0x29a/0x3a6 [batman_adv] [<ffffffffa0373db4>] batadv_softif_destroy_netlink+0x4b/0xa4 [batman_adv] [<ffffffff813b52f3>] __rtnl_link_unregister+0x48/0x92 [<ffffffff813b9240>] rtnl_link_unregister+0xc1/0xdb [<ffffffff8108547c>] ? bit_waitqueue+0x87/0x87 [<ffffffffa03850d2>] batadv_exit+0x1a/0xf48 [batman_adv] [<ffffffff810c26f9>] SyS_delete_module+0x136/0x1b0 [<ffffffff8144dc65>] entry_SYSCALL_64_fastpath+0x18/0xa8 [<ffffffff8108aaca>] ? trace_hardirqs_off_caller+0x37/0xa6 Code: 89 f7 e8 21 bd 0d e1 4d 85 e4 75 0e 31 f6 48 c7 c7 50 d7 3b a0 e8 50 16 f2 e0 49 8b 9c 24 28 01 00 00 48 85 db 0f 84 b2 00 00 00 <48> 8b 03 4d 85 ed 48 89 45 c8 74 09 4c 39 ab f8 00 00 00 75 1c RIP [<ffffffffa0371852>] batadv_purge_outstanding_packets+0x1c8/0x291 [batman_adv] RSP <ffff88001da5fd78> ---[ end trace 803b9bdc6a4a952b ]--- Kernel panic - not syncing: Fatal exception in interrupt Kernel Offset: disabled ---[ end Kernel panic - not syncing: Fatal exception in interrupt It does not happen often, but may potentially happen when frequently shutting down and reinitializing an interface. With some carefully placed msleep()s/mdelay()s it can be reproduced easily. The issue is, that on interface removal, any still running worker thread of a forwarding packet will race with the interface purging routine to free a forwarding packet. Temporarily giving up a spin-lock to be able to sleep in the purging routine is not safe. Furthermore, there is a potential general protection fault not just for the purging side shown above, but also on the worker side: Temporarily removing a forw_packet from the according forw_{bcast,bat}_list will make it impossible for the purging routine to catch and cancel it. # How this patch tries to fix it: With this patch we split the queue purging into three steps: Step 1), removing forward packets from the queue of an interface and by that claim it as our responsibility to free. Step 2), we are either lucky to cancel a pending worker before it starts to run. Or if it is already running, we wait and let it do its thing, except two things: Through the claiming in step 1) we prevent workers from a) re-arming themselves. And b) prevent workers from freeing packets which we still hold in the interface purging routine. Finally, step 3, we are sure that no forwarding packets are pending or even running anymore on the interface to remove. We can then safely free the claimed forwarding packets. Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2016-11-01 08:44:44 +00:00
struct hlist_node cleanup_list;
/** @send_time: execution time for delayed_work (packet sending) */
unsigned long send_time;
/**
* @own: bool for locally generated packets (local OGMs are re-scheduled
* after sending)
*/
u8 own;
/** @skb: bcast packet's skb buffer */
struct sk_buff *skb;
/** @packet_len: size of aggregated OGM packet inside the skb buffer */
u16 packet_len;
/** @direct_link_flags: direct link flags for aggregated OGM packets */
u32 direct_link_flags;
/** @num_packets: counter for aggregated OGMv1 packets */
u8 num_packets;
/** @delayed_work: work queue callback item for packet sending */
struct delayed_work delayed_work;
/**
* @if_incoming: pointer to incoming hard-iface or primary iface if
* locally generated packet
*/
struct batadv_hard_iface *if_incoming;
/**
* @if_outgoing: packet where the packet should be sent to, or NULL if
* unspecified
*/
struct batadv_hard_iface *if_outgoing;
/** @queue_left: The queue (counter) this packet was applied to */
atomic_t *queue_left;
};
/**
* struct batadv_algo_iface_ops - mesh algorithm callbacks (interface specific)
*/
struct batadv_algo_iface_ops {
/**
* @activate: start routing mechanisms when hard-interface is brought up
* (optional)
*/
void (*activate)(struct batadv_hard_iface *hard_iface);
/** @enable: init routing info when hard-interface is enabled */
int (*enable)(struct batadv_hard_iface *hard_iface);
/** @enabled: notification when hard-interface was enabled (optional) */
void (*enabled)(struct batadv_hard_iface *hard_iface);
/** @disable: de-init routing info when hard-interface is disabled */
void (*disable)(struct batadv_hard_iface *hard_iface);
/**
* @update_mac: (re-)init mac addresses of the protocol information
* belonging to this hard-interface
*/
void (*update_mac)(struct batadv_hard_iface *hard_iface);
/** @primary_set: called when primary interface is selected / changed */
void (*primary_set)(struct batadv_hard_iface *hard_iface);
};
/**
* struct batadv_algo_neigh_ops - mesh algorithm callbacks (neighbour specific)
*/
struct batadv_algo_neigh_ops {
/** @hardif_init: called on creation of single hop entry (optional) */
void (*hardif_init)(struct batadv_hardif_neigh_node *neigh);
/**
* @cmp: compare the metrics of two neighbors for their respective
* outgoing interfaces
*/
int (*cmp)(struct batadv_neigh_node *neigh1,
struct batadv_hard_iface *if_outgoing1,
struct batadv_neigh_node *neigh2,
struct batadv_hard_iface *if_outgoing2);
/**
* @is_similar_or_better: check if neigh1 is equally similar or better
* than neigh2 for their respective outgoing interface from the metric
* prospective
*/
bool (*is_similar_or_better)(struct batadv_neigh_node *neigh1,
struct batadv_hard_iface *if_outgoing1,
struct batadv_neigh_node *neigh2,
struct batadv_hard_iface *if_outgoing2);
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
/** @print: print the single hop neighbor list (optional) */
void (*print)(struct batadv_priv *priv, struct seq_file *seq);
#endif
/** @dump: dump neighbors to a netlink socket (optional) */
void (*dump)(struct sk_buff *msg, struct netlink_callback *cb,
struct batadv_priv *priv,
struct batadv_hard_iface *hard_iface);
};
/**
* struct batadv_algo_orig_ops - mesh algorithm callbacks (originator specific)
*/
struct batadv_algo_orig_ops {
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
/** @print: print the originator table (optional) */
void (*print)(struct batadv_priv *priv, struct seq_file *seq,
struct batadv_hard_iface *hard_iface);
#endif
/** @dump: dump originators to a netlink socket (optional) */
void (*dump)(struct sk_buff *msg, struct netlink_callback *cb,
struct batadv_priv *priv,
struct batadv_hard_iface *hard_iface);
};
/**
* struct batadv_algo_gw_ops - mesh algorithm callbacks (GW specific)
*/
struct batadv_algo_gw_ops {
/** @init_sel_class: initialize GW selection class (optional) */
void (*init_sel_class)(struct batadv_priv *bat_priv);
/**
* @store_sel_class: parse and stores a new GW selection class
* (optional)
*/
ssize_t (*store_sel_class)(struct batadv_priv *bat_priv, char *buff,
size_t count);
/** @show_sel_class: prints the current GW selection class (optional) */
ssize_t (*show_sel_class)(struct batadv_priv *bat_priv, char *buff);
/**
* @get_best_gw_node: select the best GW from the list of available
* nodes (optional)
*/
struct batadv_gw_node *(*get_best_gw_node)
(struct batadv_priv *bat_priv);
/**
* @is_eligible: check if a newly discovered GW is a potential candidate
* for the election as best GW (optional)
*/
bool (*is_eligible)(struct batadv_priv *bat_priv,
struct batadv_orig_node *curr_gw_orig,
struct batadv_orig_node *orig_node);
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
/** @print: print the gateway table (optional) */
void (*print)(struct batadv_priv *bat_priv, struct seq_file *seq);
#endif
/** @dump: dump gateways to a netlink socket (optional) */
void (*dump)(struct sk_buff *msg, struct netlink_callback *cb,
struct batadv_priv *priv);
};
/**
* struct batadv_algo_ops - mesh algorithm callbacks
*/
struct batadv_algo_ops {
/** @list: list node for the batadv_algo_list */
struct hlist_node list;
/** @name: name of the algorithm */
char *name;
/** @iface: callbacks related to interface handling */
struct batadv_algo_iface_ops iface;
/** @neigh: callbacks related to neighbors handling */
struct batadv_algo_neigh_ops neigh;
/** @orig: callbacks related to originators handling */
struct batadv_algo_orig_ops orig;
/** @gw: callbacks related to GW mode */
struct batadv_algo_gw_ops gw;
};
/**
* struct batadv_dat_entry - it is a single entry of batman-adv ARP backend. It
* is used to stored ARP entries needed for the global DAT cache
*/
struct batadv_dat_entry {
/** @ip: the IPv4 corresponding to this DAT/ARP entry */
__be32 ip;
/** @mac_addr: the MAC address associated to the stored IPv4 */
u8 mac_addr[ETH_ALEN];
/** @vid: the vlan ID associated to this entry */
unsigned short vid;
/**
* @last_update: time in jiffies when this entry was refreshed last time
*/
unsigned long last_update;
/** @hash_entry: hlist node for &batadv_priv_dat.hash */
struct hlist_node hash_entry;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
};
/**
* struct batadv_hw_addr - a list entry for a MAC address
*/
struct batadv_hw_addr {
/** @list: list node for the linking of entries */
struct hlist_node list;
/** @addr: the MAC address of this list entry */
unsigned char addr[ETH_ALEN];
};
/**
* struct batadv_dat_candidate - candidate destination for DAT operations
*/
struct batadv_dat_candidate {
/**
* @type: the type of the selected candidate. It can one of the
* following:
* - BATADV_DAT_CANDIDATE_NOT_FOUND
* - BATADV_DAT_CANDIDATE_ORIG
*/
int type;
/**
* @orig_node: if type is BATADV_DAT_CANDIDATE_ORIG this field points to
* the corresponding originator node structure
*/
struct batadv_orig_node *orig_node;
};
/**
* struct batadv_tvlv_container - container for tvlv appended to OGMs
*/
struct batadv_tvlv_container {
/** @list: hlist node for &batadv_priv_tvlv.container_list */
struct hlist_node list;
/** @tvlv_hdr: tvlv header information needed to construct the tvlv */
struct batadv_tvlv_hdr tvlv_hdr;
/** @refcount: number of contexts the object is used */
struct kref refcount;
};
/**
* struct batadv_tvlv_handler - handler for specific tvlv type and version
*/
struct batadv_tvlv_handler {
/** @list: hlist node for &batadv_priv_tvlv.handler_list */
struct hlist_node list;
/**
* @ogm_handler: handler callback which is given the tvlv payload to
* process on incoming OGM packets
*/
void (*ogm_handler)(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
u8 flags, void *tvlv_value, u16 tvlv_value_len);
/**
* @unicast_handler: handler callback which is given the tvlv payload to
* process on incoming unicast tvlv packets
*/
int (*unicast_handler)(struct batadv_priv *bat_priv,
u8 *src, u8 *dst,
void *tvlv_value, u16 tvlv_value_len);
/** @type: tvlv type this handler feels responsible for */
u8 type;
/** @version: tvlv version this handler feels responsible for */
u8 version;
/** @flags: tvlv handler flags */
u8 flags;
/** @refcount: number of contexts the object is used */
struct kref refcount;
/** @rcu: struct used for freeing in an RCU-safe manner */
struct rcu_head rcu;
};
/**
* enum batadv_tvlv_handler_flags - tvlv handler flags definitions
*/
enum batadv_tvlv_handler_flags {
/**
* @BATADV_TVLV_HANDLER_OGM_CIFNOTFND: tvlv ogm processing function
* will call this handler even if its type was not found (with no data)
*/
BATADV_TVLV_HANDLER_OGM_CIFNOTFND = BIT(1),
/**
* @BATADV_TVLV_HANDLER_OGM_CALLED: interval tvlv handling flag - the
* API marks a handler as being called, so it won't be called if the
* BATADV_TVLV_HANDLER_OGM_CIFNOTFND flag was set
*/
BATADV_TVLV_HANDLER_OGM_CALLED = BIT(2),
};
/**
* struct batadv_store_mesh_work - Work queue item to detach add/del interface
* from sysfs locks
*/
struct batadv_store_mesh_work {
/**
* @net_dev: netdevice to add/remove to/from batman-adv soft-interface
*/
struct net_device *net_dev;
/** @soft_iface_name: name of soft-interface to modify */
char soft_iface_name[IFNAMSIZ];
/** @work: work queue item */
struct work_struct work;
};
#endif /* _NET_BATMAN_ADV_TYPES_H_ */