Commit 70644478 authored by Linus Lüssing's avatar Linus Lüssing Committed by Luis Henriques

batman-adv: Fix potentially broken skb network header access

commit 53cf037b upstream.

The two commits noted below added calls to ip_hdr() and ipv6_hdr(). They
need a correctly set skb network header.

Unfortunately we cannot rely on the device drivers to set it for us.
Therefore setting it in the beginning of the according ndo_start_xmit
handler.

Fixes: 1d8ab8d3 ("batman-adv: Modified forwarding behaviour for multicast packets")
Fixes: ab49886e ("batman-adv: Add IPv4 link-local/IPv6-ll-all-nodes multicast support")
Signed-off-by: default avatarLinus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: default avatarMarek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: default avatarAntonio Quartulli <antonio@meshcoding.com>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent e1de5802
......@@ -173,6 +173,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
int gw_mode;
enum batadv_forw_mode forw_mode;
struct batadv_orig_node *mcast_single_orig = NULL;
int network_offset = ETH_HLEN;
if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
goto dropped;
......@@ -185,14 +186,18 @@ static int batadv_interface_tx(struct sk_buff *skb,
case ETH_P_8021Q:
vhdr = vlan_eth_hdr(skb);
if (vhdr->h_vlan_encapsulated_proto != ethertype)
if (vhdr->h_vlan_encapsulated_proto != ethertype) {
network_offset += VLAN_HLEN;
break;
}
/* fall through */
case ETH_P_BATMAN:
goto dropped;
}
skb_set_network_header(skb, network_offset);
if (batadv_bla_tx(bat_priv, skb, vid))
goto dropped;
......
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