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>

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index cd8f473..e0aaf8c 100644 (file)
--- 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 d19b935..f80c447 100644 (file)
--- 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 ff56086..7ed9d8f 100644 (file)
--- 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 3d729cb..d6bbbeb 100644 (file)
--- 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 2f4848b..50e1895 100644 (file)
--- 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_ */