batman-adv: Avoid u32 overflow during gateway select
The gateway selection based on fast connections is using a single value calculated from the average tq (0-255) and the download bandwidth (in 100Kibit). The formula for the first step (tq ** 2 * 10000 * bandwidth) tends to overflow a u32 with low bandwidth settings like 50 [100KiBit] and a tq value of over 92. Changing this to a 64 bit unsigned integer allows to support a bandwidth_down with up to ~2.8e10 [100KiBit] and a perfect tq of 255. This is ~6.6 times higher than the maximum possible value of the gateway announcement TVLV. This problem only affects the non-default gw_sel_class 1. Signed-off-by: Ruben Wisniewsi <ruben@vfn-nrw.de> [sven@narfation.org: rewritten commit message] Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
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@ -153,7 +153,7 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
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struct batadv_neigh_node *router;
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struct batadv_neigh_ifinfo *router_ifinfo;
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struct batadv_gw_node *gw_node, *curr_gw = NULL;
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uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
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uint64_t max_gw_factor = 0, tmp_gw_factor = 0;
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uint8_t max_tq = 0;
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uint8_t tq_avg;
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struct batadv_orig_node *orig_node;
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