batman-adv: Distributed ARP Table - implement local storage

[karo-tx-linux.git] / net / batman-adv / types.h

diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 2ed82caacdca4bfa0cf429d74a7311523874b4c2..9ed1bb275d31a92a201c2d9ead87655b8320ac7a 100644 (file)
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -28,20 +28,37 @@
        (ETH_HLEN + max(sizeof(struct batadv_unicast_packet), \
                        sizeof(struct batadv_bcast_packet)))
 
+/* batadv_dat_addr_t is the 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*
+ */
+#define batadv_dat_addr_t uint16_t
+
+/**
+ * struct batadv_hard_iface_bat_iv - per hard interface B.A.T.M.A.N. IV data
+ * @ogm_buff: buffer holding the OGM packet
+ * @ogm_buff_len: length of the OGM packet buffer
+ * @ogm_seqno: OGM sequence number - used to identify each OGM
+ */
+struct batadv_hard_iface_bat_iv {
+       unsigned char *ogm_buff;
+       int ogm_buff_len;
+       atomic_t ogm_seqno;
+};
+
 struct batadv_hard_iface {
        struct list_head list;
        int16_t if_num;
        char if_status;
        struct net_device *net_dev;
-       atomic_t seqno;
        atomic_t frag_seqno;
-       unsigned char *packet_buff;
-       int packet_len;
        struct kobject *hardif_obj;
        atomic_t refcount;
        struct packet_type batman_adv_ptype;
        struct net_device *soft_iface;
        struct rcu_head rcu;
+       struct batadv_hard_iface_bat_iv bat_iv;
 };
 
 /**
@@ -63,6 +80,7 @@ struct batadv_orig_node {
        uint8_t orig[ETH_ALEN];
        uint8_t primary_addr[ETH_ALEN];
        struct batadv_neigh_node __rcu *router; /* rcu protected pointer */
+       batadv_dat_addr_t dat_addr;
        unsigned long *bcast_own;
        uint8_t *bcast_own_sum;
        unsigned long last_seen;
@@ -205,6 +223,8 @@ struct batadv_priv_bla {
        struct batadv_hashtable *backbone_hash;
        struct batadv_bcast_duplist_entry bcast_duplist[BATADV_DUPLIST_SIZE];
        int bcast_duplist_curr;
+       /* protects bcast_duplist and bcast_duplist_curr */
+       spinlock_t bcast_duplist_lock;
        struct batadv_bla_claim_dst claim_dest;
        struct delayed_work work;
 };
@@ -226,6 +246,18 @@ struct batadv_priv_vis {
        struct batadv_vis_info *my_info;
 };
 
+/**
+ * struct batadv_priv_dat - per mesh interface DAT private data
+ * @addr: node DAT address
+ * @hash: hashtable representing the local ARP cache
+ * @work: work queue callback item for cache purging
+ */
+struct batadv_priv_dat {
+       batadv_dat_addr_t addr;
+       struct batadv_hashtable *hash;
+       struct delayed_work work;
+};
+
 struct batadv_priv {
        atomic_t mesh_state;
        struct net_device_stats stats;
@@ -263,6 +295,7 @@ struct batadv_priv {
        struct batadv_priv_gw gw;
        struct batadv_priv_tt tt;
        struct batadv_priv_vis vis;
+       struct batadv_priv_dat dat;
 };
 
 struct batadv_socket_client {
@@ -435,4 +468,36 @@ struct batadv_algo_ops {
        void (*bat_ogm_emit)(struct batadv_forw_packet *forw_packet);
 };
 
+/**
+ * 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
+ * @ip: the IPv4 corresponding to this DAT/ARP entry
+ * @mac_addr: the MAC address associated to the stored IPv4
+ * @last_update: time in jiffies when this entry was refreshed last time
+ * @hash_entry: hlist node for batadv_priv_dat::hash
+ * @refcount: number of contexts the object is used
+ * @rcu: struct used for freeing in an RCU-safe manner
+ */
+struct batadv_dat_entry {
+       __be32 ip;
+       uint8_t mac_addr[ETH_ALEN];
+       unsigned long last_update;
+       struct hlist_node hash_entry;
+       atomic_t refcount;
+       struct rcu_head rcu;
+};
+
+/**
+ * struct batadv_dat_candidate - candidate destination for DAT operations
+ * @type: the type of the selected candidate. It can one of the following:
+ *       - BATADV_DAT_CANDIDATE_NOT_FOUND
+ *       - BATADV_DAT_CANDIDATE_ORIG
+ * @orig_node: if type is BATADV_DAT_CANDIDATE_ORIG this field points to the
+ *            corresponding originator node structure
+ */
+struct batadv_dat_candidate {
+       int type;
+       struct batadv_orig_node *orig_node;
+};
+
 #endif /* _NET_BATMAN_ADV_TYPES_H_ */