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batman-adv: add B.A.T.M.A.N. Dump BLA claims via netlink

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Dump the list of bridge loop avoidance claims via the netlink socket.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
[sven.eckelmann@open-mesh.com: add policy for attributes, fix includes, fix
soft_iface reference leak]
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
[sw@simonwunderlich.de: fix kerneldoc, fix error reporting]
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
This commit is contained in:
Andrew Lunn 2016-07-03 13:31:45 +02:00 committed by Simon Wunderlich
parent b71bb6f924
commit 04f3f5bf18
4 changed files with 202 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/uapi/linux/batman_adv.h
View File

@ -91,6 +91,11 @@ enum batadv_tt_client_flags {
* @BATADV_ATTR_BANDWIDTH_UP: Reported uplink bandwidth
* @BATADV_ATTR_BANDWIDTH_DOWN: Reported downlink bandwidth
* @BATADV_ATTR_ROUTER: Gateway router MAC address
* @BATADV_ATTR_BLA_OWN: Flag indicating own originator
* @BATADV_ATTR_BLA_ADDRESS: Bridge loop avoidance claim MAC address
* @BATADV_ATTR_BLA_VID: BLA VLAN ID
* @BATADV_ATTR_BLA_BACKBONE: BLA gateway originator MAC address
* @BATADV_ATTR_BLA_CRC: BLA CRC
* @__BATADV_ATTR_AFTER_LAST: internal use
* @NUM_BATADV_ATTR: total number of batadv_nl_attrs available
* @BATADV_ATTR_MAX: highest attribute number currently defined
@ -126,6 +131,11 @@ enum batadv_nl_attrs {
BATADV_ATTR_BANDWIDTH_UP,
BATADV_ATTR_BANDWIDTH_DOWN,
BATADV_ATTR_ROUTER,
BATADV_ATTR_BLA_OWN,
BATADV_ATTR_BLA_ADDRESS,
BATADV_ATTR_BLA_VID,
BATADV_ATTR_BLA_BACKBONE,
BATADV_ATTR_BLA_CRC,
/* add attributes above here, update the policy in netlink.c */
__BATADV_ATTR_AFTER_LAST,
NUM_BATADV_ATTR = __BATADV_ATTR_AFTER_LAST,
@ -146,6 +156,7 @@ enum batadv_nl_attrs {
* @BATADV_CMD_GET_ORIGINATORS: Query list of originators
* @BATADV_CMD_GET_NEIGHBORS: Query list of neighbours
* @BATADV_CMD_GET_GATEWAYS: Query list of gateways
* @BATADV_CMD_GET_BLA_CLAIM: Query list of bridge loop avoidance claims
* @__BATADV_CMD_AFTER_LAST: internal use
* @BATADV_CMD_MAX: highest used command number
*/
@ -161,6 +172,7 @@ enum batadv_nl_commands {
BATADV_CMD_GET_ORIGINATORS,
BATADV_CMD_GET_NEIGHBORS,
BATADV_CMD_GET_GATEWAYS,
BATADV_CMD_GET_BLA_CLAIM,
/* add new commands above here */
__BATADV_CMD_AFTER_LAST,
BATADV_CMD_MAX = __BATADV_CMD_AFTER_LAST - 1

169
net/batman-adv/bridge_loop_avoidance.c
View File

@ -35,6 +35,7 @@
#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>
@ -45,12 +46,18 @@
#include <linux/string.h>
#include <linux/workqueue.h>
#include <net/arp.h>
#include <net/genetlink.h>
#include <net/netlink.h>
#include <net/sock.h>
#include <uapi/linux/batman_adv.h>
#include "hard-interface.h"
#include "hash.h"
#include "log.h"
#include "netlink.h"
#include "originator.h"
#include "packet.h"
#include "soft-interface.h"
#include "sysfs.h"
#include "translation-table.h"
@ -2051,6 +2058,168 @@ out:
return 0;
}
/**
* batadv_bla_claim_dump_entry - dump one entry of the claim table
* to a netlink socket
* @msg: buffer for the message
* @portid: netlink port
* @seq: Sequence number of netlink message
* @primary_if: primary interface
* @claim: entry to dump
*
* Return: 0 or error code.
*/
static int
batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_hard_iface *primary_if,
struct batadv_bla_claim *claim)
{
u8 *primary_addr = primary_if->net_dev->dev_addr;
u16 backbone_crc;
bool is_own;
void *hdr;
int ret = -EINVAL;
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM);
if (!hdr) {
ret = -ENOBUFS;
goto out;
}
is_own = batadv_compare_eth(claim->backbone_gw->orig,
primary_addr);
spin_lock_bh(&claim->backbone_gw->crc_lock);
backbone_crc = claim->backbone_gw->crc;
spin_unlock_bh(&claim->backbone_gw->crc_lock);
if (is_own)
if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
genlmsg_cancel(msg, hdr);
goto out;
}
if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) ||
nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) ||
nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
claim->backbone_gw->orig) ||
nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
backbone_crc)) {
genlmsg_cancel(msg, hdr);
goto out;
}
genlmsg_end(msg, hdr);
ret = 0;
out:
return ret;
}
/**
* batadv_bla_claim_dump_bucket - dump one bucket of the claim table
* to a netlink socket
* @msg: buffer for the message
* @portid: netlink port
* @seq: Sequence number of netlink message
* @primary_if: primary interface
* @head: bucket to dump
* @idx_skip: How many entries to skip
*
* Return: always 0.
*/
static int
batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_hard_iface *primary_if,
struct hlist_head *head, int *idx_skip)
{
struct batadv_bla_claim *claim;
int idx = 0;
rcu_read_lock();
hlist_for_each_entry_rcu(claim, head, hash_entry) {
if (idx++ < *idx_skip)
continue;
if (batadv_bla_claim_dump_entry(msg, portid, seq,
primary_if, claim)) {
*idx_skip = idx - 1;
goto unlock;
}
}
*idx_skip = idx;
unlock:
rcu_read_unlock();
return 0;
}
/**
* batadv_bla_claim_dump - dump claim table to a netlink socket
* @msg: buffer for the message
* @cb: callback structure containing arguments
*
* Return: message length.
*/
int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
struct batadv_hard_iface *primary_if = NULL;
int portid = NETLINK_CB(cb->skb).portid;
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct batadv_hashtable *hash;
struct batadv_priv *bat_priv;
int bucket = cb->args[0];
struct hlist_head *head;
int idx = cb->args[1];
int ifindex;
int ret = 0;
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);
hash = bat_priv->bla.claim_hash;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
ret = -ENOENT;
goto out;
}
while (bucket < hash->size) {
head = &hash->table[bucket];
if (batadv_bla_claim_dump_bucket(msg, portid,
cb->nlh->nlmsg_seq,
primary_if, head, &idx))
break;
bucket++;
}
cb->args[0] = bucket;
cb->args[1] = idx;
ret = msg->len;
out:
if (primary_if)
batadv_hardif_put(primary_if);
if (soft_iface)
dev_put(soft_iface);
return ret;
}
/**
* batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq
* file

10
net/batman-adv/bridge_loop_avoidance.h
View File

@ -23,6 +23,7 @@
#include <linux/types.h>
struct net_device;
struct netlink_callback;
struct seq_file;
struct sk_buff;
@ -35,6 +36,7 @@ bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
struct batadv_orig_node *orig_node,
int hdr_size);
int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset);
int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb);
int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq,
void *offset);
bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
@ -47,7 +49,7 @@ void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
void batadv_bla_status_update(struct net_device *net_dev);
int batadv_bla_init(struct batadv_priv *bat_priv);
void batadv_bla_free(struct batadv_priv *bat_priv);
int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb);
#define BATADV_BLA_CRC_INIT 0
#else /* ifdef CONFIG_BATMAN_ADV_BLA */
@ -112,6 +114,12 @@ static inline void batadv_bla_free(struct batadv_priv *bat_priv)
{
}
static inline int batadv_bla_claim_dump(struct sk_buff *msg,
struct netlink_callback *cb)
{
return -EOPNOTSUPP;
}
#endif /* ifdef CONFIG_BATMAN_ADV_BLA */
#endif /* ifndef _NET_BATMAN_ADV_BLA_H_ */

12
net/batman-adv/netlink.c
View File

@ -38,6 +38,7 @@
#include <uapi/linux/batman_adv.h>
#include "bat_algo.h"
#include "bridge_loop_avoidance.h"
#include "gateway_client.h"
#include "hard-interface.h"
#include "originator.h"
@ -91,6 +92,11 @@ static struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
[BATADV_ATTR_BANDWIDTH_UP] = { .type = NLA_U32 },
[BATADV_ATTR_BANDWIDTH_DOWN] = { .type = NLA_U32 },
[BATADV_ATTR_ROUTER] = { .len = ETH_ALEN },
[BATADV_ATTR_BLA_OWN] = { .type = NLA_FLAG },
[BATADV_ATTR_BLA_ADDRESS] = { .len = ETH_ALEN },
[BATADV_ATTR_BLA_VID] = { .type = NLA_U16 },
[BATADV_ATTR_BLA_BACKBONE] = { .len = ETH_ALEN },
[BATADV_ATTR_BLA_CRC] = { .type = NLA_U16 },
};
/**
@ -580,6 +586,12 @@ static struct genl_ops batadv_netlink_ops[] = {
.policy = batadv_netlink_policy,
.dumpit = batadv_gw_dump,
},
{
.cmd = BATADV_CMD_GET_BLA_CLAIM,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_bla_claim_dump,
},
};
/**