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batman-adv: Ignore own maximum aggregation size during RX

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commit 548b0c5de7619ef53bbde5590700693f2f6d2a56 upstream.

An OGMv1 and OGMv2 packet receive processing were not only limited by the
number of bytes in the received packet but also by the nodes maximum
aggregation packet size limit. But this limit is relevant for TX and not
for RX. It must not be enforced by batadv_(i)v_ogm_aggr_packet to avoid
loss of information in case of a different limit for sender and receiver.

This has a minor side effect for B.A.T.M.A.N. IV because the
batadv_iv_ogm_aggr_packet is also used for the preprocessing for the TX.
But since the aggregation code itself will not allow more than
BATADV_MAX_AGGREGATION_BYTES bytes, this check was never triggering (in
this context) prior of removing it.

Cc: stable@vger.kernel.org
Fixes: c6c8fea297 ("net: Add batman-adv meshing protocol")
Fixes: 9323158ef9 ("batman-adv: OGMv2 - implement originators logic")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sven Eckelmann 2025-02-02 17:04:13 +01:00 committed by Greg Kroah-Hartman
parent b7b4be1fa4
commit 6e38b4a4b3
2 changed files with 2 additions and 4 deletions
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3
net/batman-adv/bat_iv_ogm.c
View File

@ -324,8 +324,7 @@ batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
/* check if there is enough space for the optional TVLV */
next_buff_pos += ntohs(ogm_packet->tvlv_len);
return (next_buff_pos <= packet_len) &&
(next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
return next_buff_pos <= packet_len;
}
/* send a batman ogm to a given interface */

3
net/batman-adv/bat_v_ogm.c
View File

@ -839,8 +839,7 @@ batadv_v_ogm_aggr_packet(int buff_pos, int packet_len,
/* check if there is enough space for the optional TVLV */
next_buff_pos += ntohs(ogm2_packet->tvlv_len);
return (next_buff_pos <= packet_len) &&
(next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
return next_buff_pos <= packet_len;
}
/**