Dump the list of DAT cache entries via the netlink socket.
Signed-off-by: Linus Lüssing <linus.luess...@c0d3.blue>
---
include/uapi/linux/batman_adv.h | 20 +++++
net/batman-adv/distributed-arp-table.c | 151 +++++++++++++++++++++++++++++++++
net/batman-adv/distributed-arp-table.h | 7 ++
net/batman-adv/netlink.c | 10 +++
4 files changed, 188 insertions(+)
diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h
index 56ae2893..85c9fe8a 100644
--- a/include/uapi/linux/batman_adv.h
+++ b/include/uapi/linux/batman_adv.h
@@ -272,6 +272,21 @@ enum batadv_nl_attrs {
*/
BATADV_ATTR_BLA_CRC,
+ /**
+ * @BATADV_ATTR_DC_ADDRESS: Client IPv4 address
+ */
+ BATADV_ATTR_DC_ADDRESS,
+
+ /**
+ * @BATADV_ATTR_DC_HWADDRESS: Client MAC address
+ */
+ BATADV_ATTR_DC_HWADDRESS,
+
+ /**
+ * @BATADV_ATTR_DC_VID: VLAN ID
+ */
+ BATADV_ATTR_DC_VID,
+
/* add attributes above here, update the policy in netlink.c */
/**
@@ -361,6 +376,11 @@ enum batadv_nl_commands {
*/
BATADV_CMD_GET_BLA_BACKBONE,
+ /**
+ * @BATADV_CMD_GET_DAT_CACHE: Query list of DAT cache entries
+ */
+ BATADV_CMD_GET_DAT_CACHE,
+
/* add new commands above here */
/**
diff --git a/net/batman-adv/distributed-arp-table.c
b/net/batman-adv/distributed-arp-table.c
index 19b15de4..aca34e95 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -43,13 +43,18 @@
#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 "bridge_loop_avoidance.h"
#include "hard-interface.h"
#include "hash.h"
#include "log.h"
+#include "netlink.h"
#include "originator.h"
#include "send.h"
+#include "soft-interface.h"
#include "translation-table.h"
#include "tvlv.h"
@@ -852,6 +857,152 @@ int batadv_dat_cache_seq_print_text(struct seq_file *seq,
void *offset)
#endif
/**
+ * batadv_dat_cache_dump_entry() - dump one entry of the DAT cache table to a
+ * netlink socket
+ * @msg: buffer for the message
+ * @portid: netlink port
+ * @seq: Sequence number of netlink message
+ * @dat_entry: entry to dump
+ *
+ * Return: 0 or error code.
+ */
+static int
+batadv_dat_cache_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
+ struct batadv_dat_entry *dat_entry)
+{
+ int msecs;
+ void *hdr;
+ u32 ip;
+
+ hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
+ NLM_F_MULTI, BATADV_CMD_GET_DAT_CACHE);
+ if (!hdr)
+ return -ENOBUFS;
+
+ msecs = jiffies_to_msecs(jiffies - dat_entry->last_update);
+ ip = ntohl(dat_entry->ip);
+
+ if (nla_put_u32(msg, BATADV_ATTR_DC_ADDRESS, ip) ||
+ nla_put(msg, BATADV_ATTR_DC_HWADDRESS, ETH_ALEN,
+ dat_entry->mac_addr) ||
+ nla_put_u16(msg, BATADV_ATTR_DC_VID, dat_entry->vid) ||
+ nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) {
+ genlmsg_cancel(msg, hdr);
+ return -EMSGSIZE;
+ }
+
+ genlmsg_end(msg, hdr);
+ return 0;
+}
+
+/**
+ * batadv_dat_cache_dump_bucket() - dump one bucket of the DAT cache table to
+ * a netlink socket
+ * @msg: buffer for the message
+ * @portid: netlink port
+ * @seq: Sequence number of netlink message
+ * @head: bucket to dump
+ * @idx_skip: How many entries to skip
+ *
+ * Return: 0 or error code.
+ */
+static int
+batadv_dat_cache_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
+ struct hlist_head *head, int *idx_skip)
+{
+ struct batadv_dat_entry *dat_entry;
+ int idx = 0;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(dat_entry, head, hash_entry) {
+ if (idx < *idx_skip)
+ goto skip;
+
+ if (batadv_dat_cache_dump_entry(msg, portid, seq,
+ dat_entry)) {
+ rcu_read_unlock();
+ *idx_skip = idx;
+
+ return -EMSGSIZE;
+ }
+
+skip:
+ idx++;
+ }
+ rcu_read_unlock();
+
+ return 0;
+}
+
+/**
+ * batadv_dat_cache_dump() - dump DAT cache table to a netlink socket
+ * @msg: buffer for the message
+ * @cb: callback structure containing arguments
+ *
+ * Return: message length.
+ */
+int batadv_dat_cache_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->dat.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_dat_cache_dump_bucket(msg, portid,
+ cb->nlh->nlmsg_seq, head,
+ &idx))
+ break;
+
+ bucket++;
+ idx = 0;
+ }
+
+ 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_arp_get_type() - parse an ARP packet and gets the type
* @bat_priv: the bat priv with all the soft interface information
* @skb: packet to analyse
diff --git a/net/batman-adv/distributed-arp-table.h
b/net/batman-adv/distributed-arp-table.h
index e24aa960..23d11494 100644
--- a/net/batman-adv/distributed-arp-table.h
+++ b/net/batman-adv/distributed-arp-table.h
@@ -81,6 +81,7 @@ batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
int batadv_dat_init(struct batadv_priv *bat_priv);
void batadv_dat_free(struct batadv_priv *bat_priv);
int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset);
+int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb);
/**
* batadv_dat_inc_counter() - increment the correct DAT packet counter
@@ -169,6 +170,12 @@ static inline void batadv_dat_free(struct batadv_priv
*bat_priv)
{
}
+static inline int
+batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb)
+{
+ return -EOPNOTSUPP;
+}
+
static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
u8 subtype)
{
diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c
index 129af56b..7812b531 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c
@@ -45,6 +45,7 @@
#include "bat_algo.h"
#include "bridge_loop_avoidance.h"
+#include "distributed-arp-table.h"
#include "gateway_client.h"
#include "hard-interface.h"
#include "originator.h"
@@ -97,6 +98,9 @@ static const struct nla_policy
batadv_netlink_policy[NUM_BATADV_ATTR] = {
[BATADV_ATTR_BLA_VID] = { .type = NLA_U16 },
[BATADV_ATTR_BLA_BACKBONE] = { .len = ETH_ALEN },
[BATADV_ATTR_BLA_CRC] = { .type = NLA_U16 },
+ [BATADV_ATTR_DC_ADDRESS] = { .type = NLA_U32 },
+ [BATADV_ATTR_DC_HWADDRESS] = { .len = ETH_ALEN },
+ [BATADV_ATTR_DC_VID] = { .type = NLA_U16 },
};
/**
@@ -604,6 +608,12 @@ static const struct genl_ops batadv_netlink_ops[] = {
.policy = batadv_netlink_policy,
.dumpit = batadv_bla_backbone_dump,
},
+ {
+ .cmd = BATADV_CMD_GET_DAT_CACHE,
+ .flags = GENL_ADMIN_PERM,
+ .policy = batadv_netlink_policy,
+ .dumpit = batadv_dat_cache_dump,
+ },
};
--
2.11.0
