3.16.57-rc1 review patch. If anyone has any objections, please let me know.
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From: Sven Eckelmann sven@narfation.org
commit fc04fdb2c8a894283259f5621d31d75610701091 upstream.
batadv_check_unicast_ttvn may redirect a packet to itself or another originator. This involves rewriting the ttvn and the destination address in the batadv unicast header. These field were not yet pulled (with skb rcsum update) and thus any change to them also requires a change in the receive checksum.
Reported-by: Matthias Schiffer mschiffer@universe-factory.net Fixes: a73105b8d4c7 ("batman-adv: improved client announcement mechanism") Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Simon Wunderlich sw@simonwunderlich.de [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- net/batman-adv/routing.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-)
--- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -687,6 +687,7 @@ out: /** * batadv_reroute_unicast_packet - update the unicast header for re-routing * @bat_priv: the bat priv with all the soft interface information + * @skb: unicast packet to process * @unicast_packet: the unicast header to be updated * @dst_addr: the payload destination * @vid: VLAN identifier @@ -698,7 +699,7 @@ out: * Returns true if the packet header has been updated, false otherwise */ static bool -batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, +batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, struct batadv_unicast_packet *unicast_packet, uint8_t *dst_addr, unsigned short vid) { @@ -727,8 +728,10 @@ batadv_reroute_unicast_packet(struct bat }
/* update the packet header */ + skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); ether_addr_copy(unicast_packet->dest, orig_addr); unicast_packet->ttvn = orig_ttvn; + skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet));
ret = true; out: @@ -768,7 +771,7 @@ static int batadv_check_unicast_ttvn(str * the packet to */ if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { - if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, + if (batadv_reroute_unicast_packet(bat_priv, skb, unicast_packet, ethhdr->h_dest, vid)) net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, @@ -814,7 +817,7 @@ static int batadv_check_unicast_ttvn(str * destination can possibly be updated and forwarded towards the new * target host */ - if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, + if (batadv_reroute_unicast_packet(bat_priv, skb, unicast_packet, ethhdr->h_dest, vid)) { net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", @@ -837,12 +840,14 @@ static int batadv_check_unicast_ttvn(str if (!primary_if) return 0;
+ /* update the packet header */ + skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); + unicast_packet->ttvn = curr_ttvn; + skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet));
batadv_hardif_free_ref(primary_if);
- unicast_packet->ttvn = curr_ttvn; - return 1; }