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batman-adv: introduce packet type handler array for incoming packets
The packet handler array replaces the growing switch statement, thus dealing with incoming packets in a more efficient way. It also adds to possibility to register packet handlers on the fly. 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>
This commit is contained in:
Marek Lindner
Antonio Quartulli
parent
75cd33f863
commit
ffa995e036
@ -32,12 +32,6 @@
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#include <linux/if_arp.h>
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static int batman_skb_recv(struct sk_buff *skb,
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struct net_device *dev,
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struct packet_type *ptype,
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struct net_device *orig_dev);
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void hardif_free_rcu(struct rcu_head *rcu)
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{
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struct hard_iface *hard_iface;
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@ -551,113 +545,6 @@ out:
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return NOTIFY_DONE;
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}
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/* incoming packets with the batman ethertype received on any active hard
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* interface */
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static int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *ptype,
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struct net_device *orig_dev)
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{
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struct bat_priv *bat_priv;
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struct batman_ogm_packet *batman_ogm_packet;
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struct hard_iface *hard_iface;
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int ret;
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hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
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skb = skb_share_check(skb, GFP_ATOMIC);
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/* skb was released by skb_share_check() */
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if (!skb)
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goto err_out;
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/* packet should hold at least type and version */
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if (unlikely(!pskb_may_pull(skb, 2)))
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goto err_free;
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/* expect a valid ethernet header here. */
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if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
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goto err_free;
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if (!hard_iface->soft_iface)
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goto err_free;
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bat_priv = netdev_priv(hard_iface->soft_iface);
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if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
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goto err_free;
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/* discard frames on not active interfaces */
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if (hard_iface->if_status != IF_ACTIVE)
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goto err_free;
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batman_ogm_packet = (struct batman_ogm_packet *)skb->data;
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if (batman_ogm_packet->header.version != COMPAT_VERSION) {
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bat_dbg(DBG_BATMAN, bat_priv,
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"Drop packet: incompatible batman version (%i)\n",
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batman_ogm_packet->header.version);
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goto err_free;
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}
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/* all receive handlers return whether they received or reused
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* the supplied skb. if not, we have to free the skb. */
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switch (batman_ogm_packet->header.packet_type) {
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/* batman originator packet */
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case BAT_IV_OGM:
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ret = recv_bat_ogm_packet(skb, hard_iface);
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break;
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/* batman icmp packet */
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case BAT_ICMP:
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ret = recv_icmp_packet(skb, hard_iface);
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break;
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/* unicast packet */
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case BAT_UNICAST:
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ret = recv_unicast_packet(skb, hard_iface);
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break;
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/* fragmented unicast packet */
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case BAT_UNICAST_FRAG:
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ret = recv_ucast_frag_packet(skb, hard_iface);
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break;
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/* broadcast packet */
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case BAT_BCAST:
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ret = recv_bcast_packet(skb, hard_iface);
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break;
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/* vis packet */
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case BAT_VIS:
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ret = recv_vis_packet(skb, hard_iface);
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break;
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/* Translation table query (request or response) */
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case BAT_TT_QUERY:
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ret = recv_tt_query(skb, hard_iface);
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break;
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/* Roaming advertisement */
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case BAT_ROAM_ADV:
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ret = recv_roam_adv(skb, hard_iface);
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break;
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default:
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ret = NET_RX_DROP;
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}
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if (ret == NET_RX_DROP)
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kfree_skb(skb);
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/* return NET_RX_SUCCESS in any case as we
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* most probably dropped the packet for
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* routing-logical reasons. */
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return NET_RX_SUCCESS;
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err_free:
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kfree_skb(skb);
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err_out:
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return NET_RX_DROP;
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}
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/* This function returns true if the interface represented by ifindex is a
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* 802.11 wireless device */
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bool is_wifi_iface(int ifindex)
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@ -39,6 +39,7 @@
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/* List manipulations on hardif_list have to be rtnl_lock()'ed,
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* list traversals just rcu-locked */
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struct list_head hardif_list;
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static int (*recv_packet_handler[256])(struct sk_buff *, struct hard_iface *);
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char bat_routing_algo[20] = "BATMAN IV";
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static struct hlist_head bat_algo_list;
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@ -46,11 +47,15 @@ unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
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struct workqueue_struct *bat_event_workqueue;
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static void recv_handler_init(void);
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static int __init batman_init(void)
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{
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INIT_LIST_HEAD(&hardif_list);
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INIT_HLIST_HEAD(&bat_algo_list);
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recv_handler_init();
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bat_iv_init();
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/* the name should not be longer than 10 chars - see
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@ -179,6 +184,122 @@ int is_my_mac(const uint8_t *addr)
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return 0;
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}
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static int recv_unhandled_packet(struct sk_buff *skb,
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struct hard_iface *recv_if)
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{
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return NET_RX_DROP;
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}
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/* incoming packets with the batman ethertype received on any active hard
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* interface
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*/
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int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *ptype, struct net_device *orig_dev)
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{
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struct bat_priv *bat_priv;
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struct batman_ogm_packet *batman_ogm_packet;
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struct hard_iface *hard_iface;
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uint8_t idx;
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int ret;
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hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
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skb = skb_share_check(skb, GFP_ATOMIC);
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/* skb was released by skb_share_check() */
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if (!skb)
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goto err_out;
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/* packet should hold at least type and version */
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if (unlikely(!pskb_may_pull(skb, 2)))
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goto err_free;
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/* expect a valid ethernet header here. */
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if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
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goto err_free;
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if (!hard_iface->soft_iface)
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goto err_free;
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bat_priv = netdev_priv(hard_iface->soft_iface);
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if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
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goto err_free;
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/* discard frames on not active interfaces */
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if (hard_iface->if_status != IF_ACTIVE)
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goto err_free;
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batman_ogm_packet = (struct batman_ogm_packet *)skb->data;
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if (batman_ogm_packet->header.version != COMPAT_VERSION) {
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bat_dbg(DBG_BATMAN, bat_priv,
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"Drop packet: incompatible batman version (%i)\n",
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batman_ogm_packet->header.version);
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goto err_free;
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}
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/* all receive handlers return whether they received or reused
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* the supplied skb. if not, we have to free the skb.
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*/
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idx = batman_ogm_packet->header.packet_type;
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ret = (*recv_packet_handler[idx])(skb, hard_iface);
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if (ret == NET_RX_DROP)
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kfree_skb(skb);
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/* return NET_RX_SUCCESS in any case as we
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* most probably dropped the packet for
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* routing-logical reasons.
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*/
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return NET_RX_SUCCESS;
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err_free:
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kfree_skb(skb);
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err_out:
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return NET_RX_DROP;
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}
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static void recv_handler_init(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(recv_packet_handler); i++)
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recv_packet_handler[i] = recv_unhandled_packet;
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/* batman originator packet */
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recv_packet_handler[BAT_IV_OGM] = recv_bat_ogm_packet;
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/* batman icmp packet */
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recv_packet_handler[BAT_ICMP] = recv_icmp_packet;
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/* unicast packet */
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recv_packet_handler[BAT_UNICAST] = recv_unicast_packet;
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/* fragmented unicast packet */
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recv_packet_handler[BAT_UNICAST_FRAG] = recv_ucast_frag_packet;
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/* broadcast packet */
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recv_packet_handler[BAT_BCAST] = recv_bcast_packet;
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/* vis packet */
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recv_packet_handler[BAT_VIS] = recv_vis_packet;
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/* Translation table query (request or response) */
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recv_packet_handler[BAT_TT_QUERY] = recv_tt_query;
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/* Roaming advertisement */
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recv_packet_handler[BAT_ROAM_ADV] = recv_roam_adv;
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}
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int recv_handler_register(uint8_t packet_type,
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int (*recv_handler)(struct sk_buff *,
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struct hard_iface *))
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{
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if (recv_packet_handler[packet_type] != &recv_unhandled_packet)
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return -EBUSY;
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recv_packet_handler[packet_type] = recv_handler;
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return 0;
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}
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void recv_handler_unregister(uint8_t packet_type)
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{
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recv_packet_handler[packet_type] = recv_unhandled_packet;
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}
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static struct bat_algo_ops *bat_algo_get(char *name)
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{
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struct bat_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
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@ -155,6 +155,12 @@ void mesh_free(struct net_device *soft_iface);
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void inc_module_count(void);
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void dec_module_count(void);
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int is_my_mac(const uint8_t *addr);
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int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *ptype, struct net_device *orig_dev);
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int recv_handler_register(uint8_t packet_type,
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int (*recv_handler)(struct sk_buff *,
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struct hard_iface *));
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void recv_handler_unregister(uint8_t packet_type);
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int bat_algo_register(struct bat_algo_ops *bat_algo_ops);
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int bat_algo_select(struct bat_priv *bat_priv, char *name);
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int bat_algo_seq_print_text(struct seq_file *seq, void *offset);
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