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batman-adv: Reserve extra bytes in skb for better alignment

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The ethernet header is 14 bytes long. Therefore, the data after it is not 4
byte aligned and may cause problems on systems without unaligned data access.
Reserving NET_IP_ALIGN more byes can fix the misalignment of the ethernet
header.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
This commit is contained in:
Sven Eckelmann
2012-11-04 17:11:45 +01:00
committed by Antonio Quartulli
parent 6f0a0986e3
commit 5b24657443
4 changed files with 22 additions and 19 deletions
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9
net/batman-adv/vis.c
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@@ -396,12 +396,12 @@ batadv_add_packet(struct batadv_priv *bat_priv,
return NULL;
len = sizeof(*packet) + vis_info_len;
info->skb_packet = dev_alloc_skb(len + ETH_HLEN);
info->skb_packet = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN);
if (!info->skb_packet) {
kfree(info);
return NULL;
}
skb_reserve(info->skb_packet, ETH_HLEN);
skb_reserve(info->skb_packet, ETH_HLEN + NET_IP_ALIGN);
packet = (struct batadv_vis_packet *)skb_put(info->skb_packet, len);
kref_init(&info->refcount);
@@ -873,12 +873,13 @@ int batadv_vis_init(struct batadv_priv *bat_priv)
if (!bat_priv->vis.my_info)
goto err;
len = sizeof(*packet) + BATADV_MAX_VIS_PACKET_SIZE + ETH_HLEN;
len = sizeof(*packet) + BATADV_MAX_VIS_PACKET_SIZE;
len += ETH_HLEN + NET_IP_ALIGN;
bat_priv->vis.my_info->skb_packet = dev_alloc_skb(len);
if (!bat_priv->vis.my_info->skb_packet)
goto free_info;
skb_reserve(bat_priv->vis.my_info->skb_packet, ETH_HLEN);
skb_reserve(bat_priv->vis.my_info->skb_packet, ETH_HLEN + NET_IP_ALIGN);
tmp_skb = bat_priv->vis.my_info->skb_packet;
packet = (struct batadv_vis_packet *)skb_put(tmp_skb, sizeof(*packet));