batman-adv: register batman ogm receive function during protocol init

The B.A.T.M.A.N. IV OGM receive function still was hard-coded although
it is a routing protocol specific function. This patch takes advantage
of the dynamic packet handler registration to remove the hard-coded
function calls.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Acked-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

5 files changed, 41 insertions, 24 deletions

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index cd8f473c1bd0..e0aaf8c87d65 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -1155,13 +1155,18 @@ out:
         orig_node_free_ref(orig_node);
 }
 
-static void bat_iv_ogm_receive(struct hard_iface *if_incoming,
-                               struct sk_buff *skb)
+static int bat_iv_ogm_receive(struct sk_buff *skb,
+                              struct hard_iface *if_incoming)
 {
         struct batman_ogm_packet *batman_ogm_packet;
         struct ethhdr *ethhdr;
         int buff_pos = 0, packet_len;
         unsigned char *tt_buff, *packet_buff;
+        bool ret;
+
+        ret = check_management_packet(skb, if_incoming, BATMAN_OGM_HLEN);
+        if (!ret)
+                return NET_RX_DROP;
 
         packet_len = skb_headlen(skb);
         ethhdr = (struct ethhdr *)skb_mac_header(skb);
@@ -1187,6 +1192,9 @@ static void bat_iv_ogm_receive(struct hard_iface *if_incoming,
                                                 (packet_buff + buff_pos);
         } while (bat_iv_ogm_aggr_packet(buff_pos, packet_len,
                                         batman_ogm_packet->tt_num_changes));
+
+        kfree_skb(skb);
+        return NET_RX_SUCCESS;
 }
 
 static struct bat_algo_ops batman_iv __read_mostly = {
@@ -1197,10 +1205,25 @@ static struct bat_algo_ops batman_iv __read_mostly = {
         .bat_ogm_update_mac = bat_iv_ogm_update_mac,
         .bat_ogm_schedule = bat_iv_ogm_schedule,
         .bat_ogm_emit = bat_iv_ogm_emit,
-        .bat_ogm_receive = bat_iv_ogm_receive,
 };
 
 int __init bat_iv_init(void)
 {
-        return bat_algo_register(&batman_iv);
+        int ret;
+
+        /* batman originator packet */
+        ret = recv_handler_register(BAT_IV_OGM, bat_iv_ogm_receive);
+        if (ret < 0)
+                goto out;
+
+        ret = bat_algo_register(&batman_iv);
+        if (ret < 0)
+                goto handler_unregister;
+
+        goto out;
+
+handler_unregister:
+        recv_handler_unregister(BAT_IV_OGM);
+out:
+        return ret;
 }
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index d19b93575d56..f80c4474127c 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -266,8 +266,6 @@ static void recv_handler_init(void)
         for (i = 0; i < ARRAY_SIZE(recv_packet_handler); i++)
                 recv_packet_handler[i] = recv_unhandled_packet;
 
-        /* batman originator packet */
-        recv_packet_handler[BAT_IV_OGM] = recv_bat_ogm_packet;
         /* batman icmp packet */
         recv_packet_handler[BAT_ICMP] = recv_icmp_packet;
         /* unicast packet */
@@ -334,8 +332,7 @@ int bat_algo_register(struct bat_algo_ops *bat_algo_ops)
             !bat_algo_ops->bat_primary_iface_set ||
             !bat_algo_ops->bat_ogm_update_mac ||
             !bat_algo_ops->bat_ogm_schedule ||
-            !bat_algo_ops->bat_ogm_emit ||
-            !bat_algo_ops->bat_ogm_receive) {
+            !bat_algo_ops->bat_ogm_emit) {
                 pr_info("Routing algo '%s' does not implement required ops\n",
                         bat_algo_ops->name);
                 goto out;
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index ff560863bc74..7ed9d8f92916 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -248,37 +248,35 @@ int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff,
         return 0;
 }
 
-int recv_bat_ogm_packet(struct sk_buff *skb, struct hard_iface *hard_iface)
+bool check_management_packet(struct sk_buff *skb,
+                             struct hard_iface *hard_iface,
+                             int header_len)
 {
-        struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
         struct ethhdr *ethhdr;
 
         /* drop packet if it has not necessary minimum size */
-        if (unlikely(!pskb_may_pull(skb, BATMAN_OGM_HLEN)))
-                return NET_RX_DROP;
+        if (unlikely(!pskb_may_pull(skb, header_len)))
+                return false;
 
         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 
         /* packet with broadcast indication but unicast recipient */
         if (!is_broadcast_ether_addr(ethhdr->h_dest))
-                return NET_RX_DROP;
+                return false;
 
         /* packet with broadcast sender address */
         if (is_broadcast_ether_addr(ethhdr->h_source))
-                return NET_RX_DROP;
+                return false;
 
         /* create a copy of the skb, if needed, to modify it. */
         if (skb_cow(skb, 0) < 0)
-                return NET_RX_DROP;
+                return false;
 
         /* keep skb linear */
         if (skb_linearize(skb) < 0)
-                return NET_RX_DROP;
-
-        bat_priv->bat_algo_ops->bat_ogm_receive(hard_iface, skb);
+                return false;
 
-        kfree_skb(skb);
-        return NET_RX_SUCCESS;
+        return true;
 }
 
 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h
index 3d729cb17113..d6bbbebb6567 100644
--- a/net/batman-adv/routing.h
+++ b/net/batman-adv/routing.h
@@ -23,6 +23,9 @@
 #define _NET_BATMAN_ADV_ROUTING_H_
 
 void slide_own_bcast_window(struct hard_iface *hard_iface);
+bool check_management_packet(struct sk_buff *skb,
+                             struct hard_iface *hard_iface,
+                             int header_len);
 void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node,
                   struct neigh_node *neigh_node);
 int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if);
@@ -30,7 +33,6 @@ int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if);
 int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if);
 int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if);
 int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if);
-int recv_bat_ogm_packet(struct sk_buff *skb, struct hard_iface *recv_if);
 int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if);
 int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if);
 struct neigh_node *find_router(struct bat_priv *bat_priv,
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 2f4848b776a7..50e1895a25c3 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -390,9 +390,6 @@ struct bat_algo_ops {
                                  int tt_num_changes);
         /* send scheduled OGM */
         void (*bat_ogm_emit)(struct forw_packet *forw_packet);
-        /* receive incoming OGM */
-        void (*bat_ogm_receive)(struct hard_iface *if_incoming,
-                                struct sk_buff *skb);
 };
 
 #endif /* _NET_BATMAN_ADV_TYPES_H_ */