From 53cf037bf846417fd92dc92ddf97267f69b110f4 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Linus=20L=C3=BCssing?= Date: Tue, 30 Jun 2015 23:45:26 +0200 Subject: [PATCH] batman-adv: Fix potentially broken skb network header access MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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: 1d8ab8d3c176 ("batman-adv: Modified forwarding behaviour for multicast packets") Fixes: ab49886e3da7 ("batman-adv: Add IPv4 link-local/IPv6-ll-all-nodes multicast support") Signed-off-by: Linus Lüssing Signed-off-by: Marek Lindner Signed-off-by: Antonio Quartulli --- net/batman-adv/soft-interface.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index c002961..926292d 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -202,6 +202,7 @@ 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; @@ -214,14 +215,18 @@ 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; -- 2.7.4