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batman-adv: netlink: add translation table query

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This adds the commands BATADV_CMD_GET_TRANSTABLE_LOCAL and
BATADV_CMD_GET_TRANSTABLE_GLOBAL, which correspond to the transtable_local
and transtable_global debugfs files.

The batadv_tt_client_flags enum is moved to the UAPI to expose it as part
of the netlink API.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
[sven.eckelmann@open-mesh.com: add policy for attributes, fix includes]
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
[sw@simonwunderlich.de: fix VID attributes content]
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
This commit is contained in:
Matthias Schiffer 2016-07-03 13:31:37 +02:00 committed by Simon Wunderlich
parent b60620cf56
commit d34f05507d
6 changed files with 462 additions and 37 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

56
include/uapi/linux/batman_adv.h
View file

@ -22,6 +22,42 @@
#define BATADV_NL_MCAST_GROUP_TPMETER "tpmeter"
/**
* enum batadv_tt_client_flags - TT client specific flags
* @BATADV_TT_CLIENT_DEL: the client has to be deleted from the table
* @BATADV_TT_CLIENT_ROAM: the client roamed to/from another node and the new
* update telling its new real location has not been received/sent yet
* @BATADV_TT_CLIENT_WIFI: this client is connected through a wifi interface.
* This information is used by the "AP Isolation" feature
* @BATADV_TT_CLIENT_ISOLA: this client is considered "isolated". This
* information is used by the Extended Isolation feature
* @BATADV_TT_CLIENT_NOPURGE: this client should never be removed from the table
* @BATADV_TT_CLIENT_NEW: this client has been added to the local table but has
* not been announced yet
* @BATADV_TT_CLIENT_PENDING: this client is marked for removal but it is kept
* in the table for one more originator interval for consistency purposes
* @BATADV_TT_CLIENT_TEMP: this global client has been detected to be part of
* the network but no nnode has already announced it
*
* Bits from 0 to 7 are called _remote flags_ because they are sent on the wire.
* Bits from 8 to 15 are called _local flags_ because they are used for local
* computations only.
*
* Bits from 4 to 7 - a subset of remote flags - are ensured to be in sync with
* the other nodes in the network. To achieve this goal these flags are included
* in the TT CRC computation.
*/
enum batadv_tt_client_flags {
BATADV_TT_CLIENT_DEL = (1 << 0),
BATADV_TT_CLIENT_ROAM = (1 << 1),
BATADV_TT_CLIENT_WIFI = (1 << 4),
BATADV_TT_CLIENT_ISOLA = (1 << 5),
BATADV_TT_CLIENT_NOPURGE = (1 << 8),
BATADV_TT_CLIENT_NEW = (1 << 9),
BATADV_TT_CLIENT_PENDING = (1 << 10),
BATADV_TT_CLIENT_TEMP = (1 << 11),
};
/**
* enum batadv_nl_attrs - batman-adv netlink attributes
*
@ -41,6 +77,14 @@
* @BATADV_ATTR_TPMETER_COOKIE: session cookie to match tp_meter session
* @BATADV_ATTR_PAD: attribute used for padding for 64-bit alignment
* @BATADV_ATTR_ACTIVE: Flag indicating if the hard interface is active
* @BATADV_ATTR_TT_ADDRESS: Client MAC address
* @BATADV_ATTR_TT_TTVN: Translation table version
* @BATADV_ATTR_TT_LAST_TTVN: Previous translation table version
* @BATADV_ATTR_TT_CRC32: CRC32 over translation table
* @BATADV_ATTR_TT_VID: VLAN ID
* @BATADV_ATTR_TT_FLAGS: Translation table client flags
* @BATADV_ATTR_FLAG_BEST: Flags indicating entry is the best
* @BATADV_ATTR_LAST_SEEN_MSECS: Time in milliseconds since last seen
* @__BATADV_ATTR_AFTER_LAST: internal use
* @NUM_BATADV_ATTR: total number of batadv_nl_attrs available
* @BATADV_ATTR_MAX: highest attribute number currently defined
@ -62,6 +106,14 @@ enum batadv_nl_attrs {
BATADV_ATTR_TPMETER_COOKIE,
BATADV_ATTR_PAD,
BATADV_ATTR_ACTIVE,
BATADV_ATTR_TT_ADDRESS,
BATADV_ATTR_TT_TTVN,
BATADV_ATTR_TT_LAST_TTVN,
BATADV_ATTR_TT_CRC32,
BATADV_ATTR_TT_VID,
BATADV_ATTR_TT_FLAGS,
BATADV_ATTR_FLAG_BEST,
BATADV_ATTR_LAST_SEEN_MSECS,
/* add attributes above here, update the policy in netlink.c */
__BATADV_ATTR_AFTER_LAST,
NUM_BATADV_ATTR = __BATADV_ATTR_AFTER_LAST,
@ -77,6 +129,8 @@ enum batadv_nl_attrs {
* @BATADV_CMD_TP_METER_CANCEL: Cancel a tp meter session
* @BATADV_CMD_GET_ROUTING_ALGOS: Query the list of routing algorithms.
* @BATADV_CMD_GET_HARDIFS: Query list of hard interfaces
* @BATADV_CMD_GET_TRANSTABLE_LOCAL: Query list of local translations
* @BATADV_CMD_GET_TRANSTABLE_GLOBAL Query list of global translations
* @__BATADV_CMD_AFTER_LAST: internal use
* @BATADV_CMD_MAX: highest used command number
*/
@ -87,6 +141,8 @@ enum batadv_nl_commands {
BATADV_CMD_TP_METER_CANCEL,
BATADV_CMD_GET_ROUTING_ALGOS,
BATADV_CMD_GET_HARDIFS,
BATADV_CMD_GET_TRANSTABLE_LOCAL,
BATADV_CMD_GET_TRANSTABLE_GLOBAL,
/* add new commands above here */
__BATADV_CMD_AFTER_LAST,
BATADV_CMD_MAX = __BATADV_CMD_AFTER_LAST - 1

23
net/batman-adv/netlink.c
View file

@ -40,6 +40,7 @@
#include "hard-interface.h"
#include "soft-interface.h"
#include "tp_meter.h"
#include "translation-table.h"
struct genl_family batadv_netlink_family = {
.id = GENL_ID_GENERATE,
@ -73,6 +74,14 @@ static struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
[BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 },
[BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 },
[BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG },
[BATADV_ATTR_TT_ADDRESS] = { .len = ETH_ALEN },
[BATADV_ATTR_TT_TTVN] = { .type = NLA_U8 },
[BATADV_ATTR_TT_LAST_TTVN] = { .type = NLA_U8 },
[BATADV_ATTR_TT_CRC32] = { .type = NLA_U32 },
[BATADV_ATTR_TT_VID] = { .type = NLA_U16 },
[BATADV_ATTR_TT_FLAGS] = { .type = NLA_U32 },
[BATADV_ATTR_FLAG_BEST] = { .type = NLA_FLAG },
[BATADV_ATTR_LAST_SEEN_MSECS] = { .type = NLA_U32 },
};
/**
@ -82,7 +91,7 @@ static struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
*
* Return: interface index, or 0.
*/
static int
int
batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
{
struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
@ -530,6 +539,18 @@ static struct genl_ops batadv_netlink_ops[] = {
.policy = batadv_netlink_policy,
.dumpit = batadv_netlink_dump_hardifs,
},
{
.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_tt_local_dump,
},
{
.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_tt_global_dump,
},
};
/**

3
net/batman-adv/netlink.h
View file

@ -23,8 +23,11 @@
#include <linux/types.h>
#include <net/genetlink.h>
struct nlmsghdr;
void batadv_netlink_register(void);
void batadv_netlink_unregister(void);
int batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype);
int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst,
u8 result, u32 test_time, u64 total_bytes,

36
net/batman-adv/packet.h
View file

@ -128,42 +128,6 @@ enum batadv_tt_data_flags {
BATADV_TT_FULL_TABLE = BIT(4),
};
/**
* enum batadv_tt_client_flags - TT client specific flags
* @BATADV_TT_CLIENT_DEL: the client has to be deleted from the table
* @BATADV_TT_CLIENT_ROAM: the client roamed to/from another node and the new
* update telling its new real location has not been received/sent yet
* @BATADV_TT_CLIENT_WIFI: this client is connected through a wifi interface.
* This information is used by the "AP Isolation" feature
* @BATADV_TT_CLIENT_ISOLA: this client is considered "isolated". This
* information is used by the Extended Isolation feature
* @BATADV_TT_CLIENT_NOPURGE: this client should never be removed from the table
* @BATADV_TT_CLIENT_NEW: this client has been added to the local table but has
* not been announced yet
* @BATADV_TT_CLIENT_PENDING: this client is marked for removal but it is kept
* in the table for one more originator interval for consistency purposes
* @BATADV_TT_CLIENT_TEMP: this global client has been detected to be part of
* the network but no nnode has already announced it
*
* Bits from 0 to 7 are called _remote flags_ because they are sent on the wire.
* Bits from 8 to 15 are called _local flags_ because they are used for local
* computations only.
*
* Bits from 4 to 7 - a subset of remote flags - are ensured to be in sync with
* the other nodes in the network. To achieve this goal these flags are included
* in the TT CRC computation.
*/
enum batadv_tt_client_flags {
BATADV_TT_CLIENT_DEL = BIT(0),
BATADV_TT_CLIENT_ROAM = BIT(1),
BATADV_TT_CLIENT_WIFI = BIT(4),
BATADV_TT_CLIENT_ISOLA = BIT(5),
BATADV_TT_CLIENT_NOPURGE = BIT(8),
BATADV_TT_CLIENT_NEW = BIT(9),
BATADV_TT_CLIENT_PENDING = BIT(10),
BATADV_TT_CLIENT_TEMP = BIT(11),
};
/**
* enum batadv_vlan_flags - flags for the four MSB of any vlan ID field
* @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not

377
net/batman-adv/translation-table.c
View file

@ -37,20 +37,27 @@
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/workqueue.h>
#include <net/genetlink.h>
#include <net/netlink.h>
#include <net/sock.h>
#include <uapi/linux/batman_adv.h>
#include "bridge_loop_avoidance.h"
#include "hard-interface.h"
#include "hash.h"
#include "log.h"
#include "multicast.h"
#include "netlink.h"
#include "originator.h"
#include "packet.h"
#include "soft-interface.h"
@ -1108,6 +1115,164 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
return 0;
}
/**
* batadv_tt_local_dump_entry - Dump one TT local entry into a message
* @msg :Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @bat_priv: The bat priv with all the soft interface information
* @common: tt local & tt global common data
*
* Return: Error code, or 0 on success
*/
static int
batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv,
struct batadv_tt_common_entry *common)
{
void *hdr;
struct batadv_softif_vlan *vlan;
struct batadv_tt_local_entry *local;
unsigned int last_seen_msecs;
u32 crc;
local = container_of(common, struct batadv_tt_local_entry, common);
last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen);
vlan = batadv_softif_vlan_get(bat_priv, common->vid);
if (!vlan)
return 0;
crc = vlan->tt.crc;
batadv_softif_vlan_put(vlan);
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
NLM_F_MULTI,
BATADV_CMD_GET_TRANSTABLE_LOCAL);
if (!hdr)
return -ENOBUFS;
if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
goto nla_put_failure;
if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) &&
nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs))
goto nla_put_failure;
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/**
* batadv_tt_local_dump_bucket - Dump one TT local bucket into a message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @bat_priv: The bat priv with all the soft interface information
* @head: Pointer to the list containing the local tt entries
* @idx_s: Number of entries to skip
*
* Return: Error code, or 0 on success
*/
static int
batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv,
struct hlist_head *head, int *idx_s)
{
struct batadv_tt_common_entry *common;
int idx = 0;
rcu_read_lock();
hlist_for_each_entry_rcu(common, head, hash_entry) {
if (idx++ < *idx_s)
continue;
if (batadv_tt_local_dump_entry(msg, portid, seq, bat_priv,
common)) {
rcu_read_unlock();
*idx_s = idx - 1;
return -EMSGSIZE;
}
}
rcu_read_unlock();
*idx_s = 0;
return 0;
}
/**
* batadv_tt_local_dump - Dump TT local entries into a message
* @msg: Netlink message to dump into
* @cb: Parameters from query
*
* Return: Error code, or 0 on success
*/
int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct batadv_priv *bat_priv;
struct batadv_hard_iface *primary_if = NULL;
struct batadv_hashtable *hash;
struct hlist_head *head;
int ret;
int ifindex;
int bucket = cb->args[0];
int idx = cb->args[1];
int portid = NETLINK_CB(cb->skb).portid;
ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
if (!ifindex)
return -EINVAL;
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
ret = -ENODEV;
goto out;
}
bat_priv = netdev_priv(soft_iface);
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
ret = -ENOENT;
goto out;
}
hash = bat_priv->tt.local_hash;
while (bucket < hash->size) {
head = &hash->table[bucket];
if (batadv_tt_local_dump_bucket(msg, portid, cb->nlh->nlmsg_seq,
bat_priv, head, &idx))
break;
bucket++;
}
ret = msg->len;
out:
if (primary_if)
batadv_hardif_put(primary_if);
if (soft_iface)
dev_put(soft_iface);
cb->args[0] = bucket;
cb->args[1] = idx;
return ret;
}
static void
batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
struct batadv_tt_local_entry *tt_local_entry,
@ -1755,6 +1920,218 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
return 0;
}
/**
* batadv_tt_global_dump_subentry - Dump all TT local entries into a message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @common: tt local & tt global common data
* @orig: Originator node announcing a non-mesh client
* @best: Is the best originator for the TT entry
*
* Return: Error code, or 0 on success
*/
static int
batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_tt_common_entry *common,
struct batadv_tt_orig_list_entry *orig,
bool best)
{
void *hdr;
struct batadv_orig_node_vlan *vlan;
u8 last_ttvn;
u32 crc;
vlan = batadv_orig_node_vlan_get(orig->orig_node,
common->vid);
if (!vlan)
return 0;
crc = vlan->tt.crc;
batadv_orig_node_vlan_put(vlan);
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
NLM_F_MULTI,
BATADV_CMD_GET_TRANSTABLE_GLOBAL);
if (!hdr)
return -ENOBUFS;
last_ttvn = atomic_read(&orig->orig_node->last_ttvn);
if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
orig->orig_node->orig) ||
nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) ||
nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) ||
nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
goto nla_put_failure;
if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
goto nla_put_failure;
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/**
* batadv_tt_global_dump_entry - Dump one TT global entry into a message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @bat_priv: The bat priv with all the soft interface information
* @common: tt local & tt global common data
* @sub_s: Number of entries to skip
*
* This function assumes the caller holds rcu_read_lock().
*
* Return: Error code, or 0 on success
*/
static int
batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv,
struct batadv_tt_common_entry *common, int *sub_s)
{
struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
struct batadv_tt_global_entry *global;
struct hlist_head *head;
int sub = 0;
bool best;
global = container_of(common, struct batadv_tt_global_entry, common);
best_entry = batadv_transtable_best_orig(bat_priv, global);
head = &global->orig_list;
hlist_for_each_entry_rcu(orig_entry, head, list) {
if (sub++ < *sub_s)
continue;
best = (orig_entry == best_entry);
if (batadv_tt_global_dump_subentry(msg, portid, seq, common,
orig_entry, best)) {
*sub_s = sub - 1;
return -EMSGSIZE;
}
}
*sub_s = 0;
return 0;
}
/**
* batadv_tt_global_dump_bucket - Dump one TT local bucket into a message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @bat_priv: The bat priv with all the soft interface information
* @head: Pointer to the list containing the global tt entries
* @idx_s: Number of entries to skip
* @sub: Number of entries to skip
*
* Return: Error code, or 0 on success
*/
static int
batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv,
struct hlist_head *head, int *idx_s, int *sub)
{
struct batadv_tt_common_entry *common;
int idx = 0;
rcu_read_lock();
hlist_for_each_entry_rcu(common, head, hash_entry) {
if (idx++ < *idx_s)
continue;
if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv,
common, sub)) {
rcu_read_unlock();
*idx_s = idx - 1;
return -EMSGSIZE;
}
}
rcu_read_unlock();
*idx_s = 0;
*sub = 0;
return 0;
}
/**
* batadv_tt_global_dump - Dump TT global entries into a message
* @msg: Netlink message to dump into
* @cb: Parameters from query
*
* Return: Error code, or length of message on success
*/
int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct batadv_priv *bat_priv;
struct batadv_hard_iface *primary_if = NULL;
struct batadv_hashtable *hash;
struct hlist_head *head;
int ret;
int ifindex;
int bucket = cb->args[0];
int idx = cb->args[1];
int sub = cb->args[2];
int portid = NETLINK_CB(cb->skb).portid;
ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
if (!ifindex)
return -EINVAL;
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
ret = -ENODEV;
goto out;
}
bat_priv = netdev_priv(soft_iface);
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
ret = -ENOENT;
goto out;
}
hash = bat_priv->tt.global_hash;
while (bucket < hash->size) {
head = &hash->table[bucket];
if (batadv_tt_global_dump_bucket(msg, portid,
cb->nlh->nlmsg_seq, bat_priv,
head, &idx, &sub))
break;
bucket++;
}
ret = msg->len;
out:
if (primary_if)
batadv_hardif_put(primary_if);
if (soft_iface)
dev_put(soft_iface);
cb->args[0] = bucket;
cb->args[1] = idx;
cb->args[2] = sub;
return ret;
}
/**
* _batadv_tt_global_del_orig_entry - remove and free an orig_entry
* @tt_global_entry: the global entry to remove the orig_entry from

4
net/batman-adv/translation-table.h
View file

@ -22,8 +22,10 @@
#include <linux/types.h>
struct netlink_callback;
struct net_device;
struct seq_file;
struct sk_buff;
int batadv_tt_init(struct batadv_priv *bat_priv);
bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
@ -33,6 +35,8 @@ u16 batadv_tt_local_remove(struct batadv_priv *bat_priv,
const char *message, bool roaming);
int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset);
int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset);
int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb);
int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb);
void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
s32 match_vid, const char *message);