diff options
| author | Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de> | 2012-10-18 13:47:42 +0200 |
|---|---|---|
| committer | Antonio Quartulli <ordex@autistici.org> | 2012-11-21 12:35:45 +0100 |
| commit | 004e86fc585f617f07bff38480eeee335be9b017 (patch) | |
| tree | 6155b18b4f9b14105dbde5330c53f30adac7e6bf /net/batman-adv/bridge_loop_avoidance.c | |
| parent | batman-adv: Add function to calculate crc32c for the skb payload (diff) | |
| download | linux-004e86fc585f617f07bff38480eeee335be9b017.tar.xz linux-004e86fc585f617f07bff38480eeee335be9b017.zip | |
batman-adv: Fix broadcast duplist for fragmentation
If the skb is fragmented, the checksum must be computed on the
individual fragments, just using skb->data may fail on fragmented
data. Instead of doing linearizing the packet, use the new
batadv_crc32 to do that more efficiently- it should not hurt
replacing the old crc16 by the new crc32.
Reported-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Diffstat (limited to 'net/batman-adv/bridge_loop_avoidance.c')
| -rw-r--r-- | net/batman-adv/bridge_loop_avoidance.c | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c index 7ffef8b2d4cd..5aebe9327d68 100644 --- a/net/batman-adv/bridge_loop_avoidance.c +++ b/net/batman-adv/bridge_loop_avoidance.c @@ -1249,8 +1249,7 @@ int batadv_bla_init(struct batadv_priv *bat_priv) /** * batadv_bla_check_bcast_duplist * @bat_priv: the bat priv with all the soft interface information - * @bcast_packet: encapsulated broadcast frame plus batman header - * @bcast_packet_len: length of encapsulated broadcast frame plus batman header + * @skb: contains the bcast_packet to be checked * * check if it is on our broadcast list. Another gateway might * have sent the same packet because it is connected to the same backbone, @@ -1262,20 +1261,17 @@ int batadv_bla_init(struct batadv_priv *bat_priv) * the same host however as this might be intended. */ int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, - struct batadv_bcast_packet *bcast_packet, - int bcast_packet_len) + struct sk_buff *skb) { - int i, length, curr, ret = 0; - uint8_t *content; - uint16_t crc; + int i, curr, ret = 0; + __be32 crc; + struct batadv_bcast_packet *bcast_packet; struct batadv_bcast_duplist_entry *entry; - length = bcast_packet_len - sizeof(*bcast_packet); - content = (uint8_t *)bcast_packet; - content += sizeof(*bcast_packet); + bcast_packet = (struct batadv_bcast_packet *)skb->data; /* calculate the crc ... */ - crc = crc16(0, content, length); + crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |