batman-adv: distributed arp table fixes

Signed-off-by: NMarek Lindner <lindner_marek@yahoo.de>



git-svn-id: svn://svn.openwrt.org/openwrt/packages/net/batman-adv@35324 3c298f89-4303-0410-b956-a3cf2f4a3e73

Makefile

@@ -12,7 +12,7 @@ PKG_NAME:=batman-adv
 
 PKG_VERSION:=2013.0.0
 BATCTL_VERSION:=2013.0.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_MD5SUM:=37f4aa02f393daad3d87cead2bc28ed9
 BATCTL_MD5SUM:=6ea4bcd8a9332d586bb06b5063f882cd
 

patches/0001-batman-adv-fix-skb-leak-in-batadv_dat_snoop_incoming.patch

+From 977d8c6f9253ad71e4bd8e4be2705c3bee684feb Mon Sep 17 00:00:00 2001
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Wed, 23 Jan 2013 18:11:53 +0100
+Subject: [PATCH 1/3] batman-adv: fix skb leak in
+ batadv_dat_snoop_incoming_arp_reply()
+
+The callers of batadv_dat_snoop_incoming_arp_reply() assume the skb has been
+freed when it returns true; fix this by calling kfree_skb before returning as
+it is done in batadv_dat_snoop_incoming_arp_request().
+
+Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
+Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
+Acked-by: Antonio Quartulli <ordex@autistici.org>
+---
+ distributed-arp-table.c |    2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/distributed-arp-table.c b/distributed-arp-table.c
+index 7485a78..9f4cff3 100644
+--- a/distributed-arp-table.c
++++ b/distributed-arp-table.c
+@@ -1012,6 +1012,8 @@ bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
+ 	 */
+ 	ret = !batadv_is_my_client(bat_priv, hw_dst);
+ out:
++	if (ret)
++		kfree_skb(skb);
+ 	/* if ret == false -> packet has to be delivered to the interface */
+ 	return ret;
+ }
+-- 
+1.7.10.4
+

patches/0002-batman-adv-check-for-more-types-of-invalid-IP-addres.patch

+From 3b24193d7cfc18f0cc005811ca4aab3479c2f1c6 Mon Sep 17 00:00:00 2001
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Thu, 24 Jan 2013 18:18:26 +0100
+Subject: [PATCH 2/3] batman-adv: check for more types of invalid IP addresses
+ in DAT
+
+There are more types of IP addresses that may appear in ARP packets that we
+don't want to process. While some of these should never appear in sane ARP
+packets, a 0.0.0.0 source is used for duplicate address detection and thus seen
+quite often.
+
+Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
+Acked-by: Antonio Quartulli <ordex@autistici.org>
+Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
+---
+ distributed-arp-table.c |    4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/distributed-arp-table.c b/distributed-arp-table.c
+index 9f4cff3..be3be28 100644
+--- a/distributed-arp-table.c
++++ b/distributed-arp-table.c
+@@ -777,7 +777,9 @@ static uint16_t batadv_arp_get_type(struct batadv_priv *bat_priv,
+ 	ip_src = batadv_arp_ip_src(skb, hdr_size);
+ 	ip_dst = batadv_arp_ip_dst(skb, hdr_size);
+ 	if (ipv4_is_loopback(ip_src) || ipv4_is_multicast(ip_src) ||
+-	    ipv4_is_loopback(ip_dst) || ipv4_is_multicast(ip_dst))
++	    ipv4_is_loopback(ip_dst) || ipv4_is_multicast(ip_dst) ||
++	    ipv4_is_zeronet(ip_src) || ipv4_is_lbcast(ip_src) ||
++	    ipv4_is_zeronet(ip_dst) || ipv4_is_lbcast(ip_dst))
+ 		goto out;
+ 
+ 	type = ntohs(arphdr->ar_op);
+-- 
+1.7.10.4
+

patches/0003-batman-adv-filter-ARP-packets-with-invalid-MAC-addre.patch

+From ab361a9ccc584e7501c06bfe1c00cb0411feebaf Mon Sep 17 00:00:00 2001
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Thu, 24 Jan 2013 18:18:27 +0100
+Subject: [PATCH 3/3] batman-adv: filter ARP packets with invalid MAC
+ addresses in DAT
+
+We never want multicast MAC addresses in the Distributed ARP Table, so it's
+best to completely ignore ARP packets containing them where we expect unicast
+addresses.
+
+Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
+Acked-by: Antonio Quartulli <ordex@autistici.org>
+Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
+---
+ distributed-arp-table.c |   13 +++++++++++++
+ 1 file changed, 13 insertions(+)
+
+diff --git a/distributed-arp-table.c b/distributed-arp-table.c
+index be3be28..ea0bd31 100644
+--- a/distributed-arp-table.c
++++ b/distributed-arp-table.c
+@@ -738,6 +738,7 @@ static uint16_t batadv_arp_get_type(struct batadv_priv *bat_priv,
+ 	struct arphdr *arphdr;
+ 	struct ethhdr *ethhdr;
+ 	__be32 ip_src, ip_dst;
++	uint8_t *hw_src, *hw_dst;
+ 	uint16_t type = 0;
+ 
+ 	/* pull the ethernet header */
+@@ -782,6 +783,18 @@ static uint16_t batadv_arp_get_type(struct batadv_priv *bat_priv,
+ 	    ipv4_is_zeronet(ip_dst) || ipv4_is_lbcast(ip_dst))
+ 		goto out;
+ 
++	hw_src = batadv_arp_hw_src(skb, hdr_size);
++	if (is_zero_ether_addr(hw_src) || is_multicast_ether_addr(hw_src))
++		goto out;
++
++	/* we don't care about the destination MAC address in ARP requests */
++	if (arphdr->ar_op != htons(ARPOP_REQUEST)) {
++		hw_dst = batadv_arp_hw_dst(skb, hdr_size);
++		if (is_zero_ether_addr(hw_dst) ||
++		    is_multicast_ether_addr(hw_dst))
++			goto out;
++	}
++
+ 	type = ntohs(arphdr->ar_op);
+ out:
+ 	return type;
+-- 
+1.7.10.4
+