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batman-adv: introduce packet type handler array for incoming packets

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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 2012-03-01 15:35:17 +08:00 • committed by Antonio Quartulli
parent 75cd33f863
commit ffa995e036
3 changed files with 127 additions and 113 deletions
Download patch file Download diff file Expand all files Collapse all files

113
net/batman-adv/hard-interface.c
View file

@ -32,12 +32,6 @@
#include <linux/if_arp.h> #include <linux/if_arp.h>
static int batman_skb_recv(struct sk_buff *skb,
struct net_device *dev,
struct packet_type *ptype,
struct net_device *orig_dev);
void hardif_free_rcu(struct rcu_head *rcu) void hardif_free_rcu(struct rcu_head *rcu)
{ {
struct hard_iface *hard_iface; struct hard_iface *hard_iface;
@ -551,113 +545,6 @@ out:
return NOTIFY_DONE; return NOTIFY_DONE;
} }
/* incoming packets with the batman ethertype received on any active hard
* interface */
static int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype,
struct net_device *orig_dev)
{
struct bat_priv *bat_priv;
struct batman_ogm_packet *batman_ogm_packet;
struct hard_iface *hard_iface;
int ret;
hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
skb = skb_share_check(skb, GFP_ATOMIC);
/* skb was released by skb_share_check() */
if (!skb)
goto err_out;
/* packet should hold at least type and version */
if (unlikely(!pskb_may_pull(skb, 2)))
goto err_free;
/* expect a valid ethernet header here. */
if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
goto err_free;
if (!hard_iface->soft_iface)
goto err_free;
bat_priv = netdev_priv(hard_iface->soft_iface);
if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
goto err_free;
/* discard frames on not active interfaces */
if (hard_iface->if_status != IF_ACTIVE)
goto err_free;
batman_ogm_packet = (struct batman_ogm_packet *)skb->data;
if (batman_ogm_packet->header.version != COMPAT_VERSION) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: incompatible batman version (%i)\n",
batman_ogm_packet->header.version);
goto err_free;
}
/* all receive handlers return whether they received or reused
* the supplied skb. if not, we have to free the skb. */
switch (batman_ogm_packet->header.packet_type) {
/* batman originator packet */
case BAT_IV_OGM:
ret = recv_bat_ogm_packet(skb, hard_iface);
break;
/* batman icmp packet */
case BAT_ICMP:
ret = recv_icmp_packet(skb, hard_iface);
break;
/* unicast packet */
case BAT_UNICAST:
ret = recv_unicast_packet(skb, hard_iface);
break;
/* fragmented unicast packet */
case BAT_UNICAST_FRAG:
ret = recv_ucast_frag_packet(skb, hard_iface);
break;
/* broadcast packet */
case BAT_BCAST:
ret = recv_bcast_packet(skb, hard_iface);
break;
/* vis packet */
case BAT_VIS:
ret = recv_vis_packet(skb, hard_iface);
break;
/* Translation table query (request or response) */
case BAT_TT_QUERY:
ret = recv_tt_query(skb, hard_iface);
break;
/* Roaming advertisement */
case BAT_ROAM_ADV:
ret = recv_roam_adv(skb, hard_iface);
break;
default:
ret = NET_RX_DROP;
}
if (ret == NET_RX_DROP)
kfree_skb(skb);
/* return NET_RX_SUCCESS in any case as we
* most probably dropped the packet for
* routing-logical reasons. */
return NET_RX_SUCCESS;
err_free:
kfree_skb(skb);
err_out:
return NET_RX_DROP;
}
/* This function returns true if the interface represented by ifindex is a /* This function returns true if the interface represented by ifindex is a
* 802.11 wireless device */ * 802.11 wireless device */
bool is_wifi_iface(int ifindex) bool is_wifi_iface(int ifindex)

121
net/batman-adv/main.c
View file

@ -39,6 +39,7 @@
/* List manipulations on hardif_list have to be rtnl_lock()'ed, /* List manipulations on hardif_list have to be rtnl_lock()'ed,
* list traversals just rcu-locked */ * list traversals just rcu-locked */
struct list_head hardif_list; struct list_head hardif_list;
static int (*recv_packet_handler[256])(struct sk_buff *, struct hard_iface *);
char bat_routing_algo[20] = "BATMAN IV"; char bat_routing_algo[20] = "BATMAN IV";
static struct hlist_head bat_algo_list; static struct hlist_head bat_algo_list;
@ -46,11 +47,15 @@ unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
struct workqueue_struct *bat_event_workqueue; struct workqueue_struct *bat_event_workqueue;
static void recv_handler_init(void);
static int __init batman_init(void) static int __init batman_init(void)
{ {
INIT_LIST_HEAD(&hardif_list); INIT_LIST_HEAD(&hardif_list);
INIT_HLIST_HEAD(&bat_algo_list); INIT_HLIST_HEAD(&bat_algo_list);
recv_handler_init();
bat_iv_init(); bat_iv_init();
/* the name should not be longer than 10 chars - see /* the name should not be longer than 10 chars - see
@ -179,6 +184,122 @@ int is_my_mac(const uint8_t *addr)
return 0; return 0;
} }
static int recv_unhandled_packet(struct sk_buff *skb,
struct hard_iface *recv_if)
{
return NET_RX_DROP;
}
/* incoming packets with the batman ethertype received on any active hard
* interface
*/
int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype, struct net_device *orig_dev)
{
struct bat_priv *bat_priv;
struct batman_ogm_packet *batman_ogm_packet;
struct hard_iface *hard_iface;
uint8_t idx;
int ret;
hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
skb = skb_share_check(skb, GFP_ATOMIC);
/* skb was released by skb_share_check() */
if (!skb)
goto err_out;
/* packet should hold at least type and version */
if (unlikely(!pskb_may_pull(skb, 2)))
goto err_free;
/* expect a valid ethernet header here. */
if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
goto err_free;
if (!hard_iface->soft_iface)
goto err_free;
bat_priv = netdev_priv(hard_iface->soft_iface);
if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
goto err_free;
/* discard frames on not active interfaces */
if (hard_iface->if_status != IF_ACTIVE)
goto err_free;
batman_ogm_packet = (struct batman_ogm_packet *)skb->data;
if (batman_ogm_packet->header.version != COMPAT_VERSION) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: incompatible batman version (%i)\n",
batman_ogm_packet->header.version);
goto err_free;
}
/* all receive handlers return whether they received or reused
* the supplied skb. if not, we have to free the skb.
*/
idx = batman_ogm_packet->header.packet_type;
ret = (*recv_packet_handler[idx])(skb, hard_iface);
if (ret == NET_RX_DROP)
kfree_skb(skb);
/* return NET_RX_SUCCESS in any case as we
* most probably dropped the packet for
* routing-logical reasons.
*/
return NET_RX_SUCCESS;
err_free:
kfree_skb(skb);
err_out:
return NET_RX_DROP;
}
static void recv_handler_init(void)
{
int i;
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 */
recv_packet_handler[BAT_UNICAST] = recv_unicast_packet;
/* fragmented unicast packet */
recv_packet_handler[BAT_UNICAST_FRAG] = recv_ucast_frag_packet;
/* broadcast packet */
recv_packet_handler[BAT_BCAST] = recv_bcast_packet;
/* vis packet */
recv_packet_handler[BAT_VIS] = recv_vis_packet;
/* Translation table query (request or response) */
recv_packet_handler[BAT_TT_QUERY] = recv_tt_query;
/* Roaming advertisement */
recv_packet_handler[BAT_ROAM_ADV] = recv_roam_adv;
}
int recv_handler_register(uint8_t packet_type,
int (*recv_handler)(struct sk_buff *,
struct hard_iface *))
{
if (recv_packet_handler[packet_type] != &recv_unhandled_packet)
return -EBUSY;
recv_packet_handler[packet_type] = recv_handler;
return 0;
}
void recv_handler_unregister(uint8_t packet_type)
{
recv_packet_handler[packet_type] = recv_unhandled_packet;
}
static struct bat_algo_ops *bat_algo_get(char *name) static struct bat_algo_ops *bat_algo_get(char *name)
{ {
struct bat_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; struct bat_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;

6
net/batman-adv/main.h
View file

@ -155,6 +155,12 @@ void mesh_free(struct net_device *soft_iface);
void inc_module_count(void); void inc_module_count(void);
void dec_module_count(void); void dec_module_count(void);
int is_my_mac(const uint8_t *addr); int is_my_mac(const uint8_t *addr);
int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype, struct net_device *orig_dev);
int recv_handler_register(uint8_t packet_type,
int (*recv_handler)(struct sk_buff *,
struct hard_iface *));
void recv_handler_unregister(uint8_t packet_type);
int bat_algo_register(struct bat_algo_ops *bat_algo_ops); int bat_algo_register(struct bat_algo_ops *bat_algo_ops);
int bat_algo_select(struct bat_priv *bat_priv, char *name); int bat_algo_select(struct bat_priv *bat_priv, char *name);
int bat_algo_seq_print_text(struct seq_file *seq, void *offset); int bat_algo_seq_print_text(struct seq_file *seq, void *offset);