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| author | Antonio Quartulli <ordex@autistici.org> | 2011-06-26 03:37:18 +0200 |
|---|---|---|
| committer | Antonio Quartulli <ordex@autistici.org> | 2012-11-07 20:00:21 +0100 |
| commit | c384ea3ec930ef11060a7308fbbd02b4871384f9 (patch) | |
| tree | 14764f1a722c0a5633aa9dc5cebc19081703d446 /net/batman-adv/soft-interface.c | |
| parent | 5c3a0e5535933349a5d6e6bc8b704e0611f21d3f (diff) | |
| download | linux-c384ea3ec930ef11060a7308fbbd02b4871384f9.tar.bz2 | |
batman-adv: Distributed ARP Table - add snooping functions for ARP messages
In case of an ARP message going in or out the soft_iface, it is intercepted and
a special action is performed. In particular the DHT helper functions previously
implemented are used to store all the ARP entries belonging to the network in
order to provide a fast and unicast lookup instead of the classic broadcast
flooding mechanism.
Each node stores the entries it is responsible for (following the DHT rules) in
its soft_iface ARP table. This makes it possible to reuse the kernel data
structures and functions for ARP management.
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Diffstat (limited to 'net/batman-adv/soft-interface.c')
| -rw-r--r-- | net/batman-adv/soft-interface.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index 2f123a1b174b..9dc0ae1d4da3 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -20,6 +20,7 @@ #include "main.h" #include "soft-interface.h" #include "hard-interface.h" +#include "distributed-arp-table.h" #include "routing.h" #include "send.h" #include "debugfs.h" @@ -155,6 +156,7 @@ static int batadv_interface_tx(struct sk_buff *skb, short vid __maybe_unused = -1; bool do_bcast = false; uint32_t seqno; + unsigned long brd_delay = 1; if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) goto dropped; @@ -224,6 +226,13 @@ static int batadv_interface_tx(struct sk_buff *skb, if (!primary_if) goto dropped; + /* in case of ARP request, we do not immediately broadcasti the + * packet, instead we first wait for DAT to try to retrieve the + * correct ARP entry + */ + if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) + brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); + if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) goto dropped; @@ -245,7 +254,7 @@ static int batadv_interface_tx(struct sk_buff *skb, seqno = atomic_inc_return(&bat_priv->bcast_seqno); bcast_packet->seqno = htonl(seqno); - batadv_add_bcast_packet_to_list(bat_priv, skb, 1); + batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay); /* a copy is stored in the bcast list, therefore removing * the original skb. @@ -260,6 +269,11 @@ static int batadv_interface_tx(struct sk_buff *skb, goto dropped; } + if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) + goto dropped; + + batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); + ret = batadv_unicast_send_skb(bat_priv, skb); if (ret != 0) goto dropped_freed; |