Repository : ssh://git@diktynna/batman-adv On branches: main,main

commit ffd5291f46e8e7993b918b06ded5d96b9c4ef2f3 Author: Sven Eckelmann sven@narfation.org Date: Sun Feb 2 17:04:10 2025 +0100

batman-adv: Limit number of aggregated packets directly

The currently selected size in BATADV_MAX_AGGREGATION_BYTES (512) is chosen such that the number of possible aggregated packets is lower than 32. This number must be limited so that the type of batadv_forw_packet->direct_link_flags has enough bits to represent each packet (with the size of at least 24 bytes).

This requirement is better implemented in code instead of having it inside a comment.

Signed-off-by: Sven Eckelmann sven@narfation.org

ffd5291f46e8e7993b918b06ded5d96b9c4ef2f3 net/batman-adv/bat_iv_ogm.c | 4 ++++ net/batman-adv/main.h | 3 --- 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index a4b825a8..cb8645c6 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -445,6 +445,7 @@ batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, struct batadv_ogm_packet *batadv_ogm_packet; int aggregated_bytes = forw_packet->packet_len + packet_len; struct batadv_hard_iface *primary_if = NULL; + u8 packet_num = forw_packet->num_packets + 1; bool res = false; unsigned long aggregation_end_time;

@@ -467,6 +468,9 @@ batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES) return false;

+ if (packet_num >= BITS_PER_TYPE(forw_packet->direct_link_flags)) + return false; + /* packet is not leaving on the same interface. */ if (forw_packet->if_outgoing != if_outgoing) return false; diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h index 5adefdfc..c08c96b5 100644 --- a/net/batman-adv/main.h +++ b/net/batman-adv/main.h @@ -104,9 +104,6 @@ */ #define BATADV_TQ_SIMILARITY_THRESHOLD 50

-/* should not be bigger than 512 bytes or change the size of - * forw_packet->direct_link_flags - */ #define BATADV_MAX_AGGREGATION_BYTES 512 #define BATADV_MAX_AGGREGATION_MS 100