batman-adv: Use explicit tvlv padding for ELP packets

The announcement messages of batman-adv COMPAT_VERSION 15 have the
possibility to announce additional information via a dynamic TVLV part.
This part is optional for the ELP packets and currently not parsed by the
Linux implementation. Still out-of-tree versions are using it to transport
things like neighbor hashes to optimize the rebroadcast behavior.

Since the ELP broadcast packets are smaller than the minimal ethernet
packet, it often has to be padded. This is often done (as specified in
RFC894) with octets of zero and thus work perfectly fine with the TVLV
part (making it a zero length and thus empty). But not all ethernet
compatible hardware seems to follow this advice. To avoid ambiguous
situations when parsing the TVLV header, just force the 4 bytes (TVLV
length + padding) after the required ELP header to zero.

Fixes: d6f94d91f766 ("batman-adv: ELP - adding basic infrastructure")
Reported-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

diff --git a/net/batman-adv/bat_v_elp.c b/net/batman-adv/bat_v_elp.c
index 9f481cfdf77dace2fa594585fde5079d46474c66..e8090f099eb805626ffaa1445d3d0f8254f6c9a7 100644 (file)
--- a/net/batman-adv/bat_v_elp.c
+++ b/net/batman-adv/bat_v_elp.c
@@ -352,19 +352,21 @@ out:
  */
 int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface)
 {
+       static const size_t tvlv_padding = sizeof(__be32);
        struct batadv_elp_packet *elp_packet;
        unsigned char *elp_buff;
        u32 random_seqno;
        size_t size;
        int res = -ENOMEM;
 
-       size = ETH_HLEN + NET_IP_ALIGN + BATADV_ELP_HLEN;
+       size = ETH_HLEN + NET_IP_ALIGN + BATADV_ELP_HLEN + tvlv_padding;
        hard_iface->bat_v.elp_skb = dev_alloc_skb(size);
        if (!hard_iface->bat_v.elp_skb)
                goto out;
 
        skb_reserve(hard_iface->bat_v.elp_skb, ETH_HLEN + NET_IP_ALIGN);
-       elp_buff = skb_put_zero(hard_iface->bat_v.elp_skb, BATADV_ELP_HLEN);
+       elp_buff = skb_put_zero(hard_iface->bat_v.elp_skb,
+                               BATADV_ELP_HLEN + tvlv_padding);
        elp_packet = (struct batadv_elp_packet *)elp_buff;
 
        elp_packet->packet_type = BATADV_ELP;