The following commit has been merged in the merge/master branch: commit 544f94cd3b26ffe66a7c5de96c7f640dd28bacc0 Author: Simon Wunderlich simon@open-mesh.com Date: Mon Nov 23 19:57:22 2015 +0100

batman-adv: add seqno maximum age and protection start flag parameters

To allow future use of the window protected function with different maximum sequence numbers, add a parameter to set this value which was previously hardcoded. Another parameter added for future use is a flag to return whether the protection window has started.

While at it, also fix the kerneldoc.

Signed-off-by: Simon Wunderlich simon@open-mesh.com Signed-off-by: Marek Lindner mareklindner@neomailbox.ch

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index a594496..12bdffa 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -1313,7 +1313,8 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, /* signalize caller that the packet is to be dropped. */ if (!hlist_empty(&orig_node->neigh_list) && batadv_window_protected(bat_priv, seq_diff, - &orig_ifinfo->batman_seqno_reset)) { + BATADV_TQ_LOCAL_WINDOW_SIZE, + &orig_ifinfo->batman_seqno_reset, NULL)) { ret = BATADV_PROTECTED; goto out; } diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h index 34f56ef..a58dc2f 100644 --- a/net/batman-adv/main.h +++ b/net/batman-adv/main.h @@ -35,6 +35,9 @@ /* Time To Live of broadcast messages */ #define BATADV_TTL 50

+/* maximum sequence number age of broadcast messages */ +#define BATADV_BCAST_MAX_AGE 64 + /* purge originators after time in seconds if no valid packet comes in * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE */ diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 1fb1be3..0ba5993 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -146,23 +146,29 @@ out: * @bat_priv: the bat priv with all the soft interface information * @seq_num_diff: difference between the current/received sequence number and * the last sequence number + * @seq_old_max_diff: maximum age of sequence number not considered as restart * @last_reset: jiffies timestamp of the last reset, will be updated when reset * is detected + * @protection_started: is set to true if the protection window was started, + * doesn't change otherwise. * * Return: * 0 if the packet is to be accepted. * 1 if the packet is to be ignored. */ int batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, - unsigned long *last_reset) + s32 seq_old_max_diff, unsigned long *last_reset, + bool *protection_started) { - if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || + if (seq_num_diff <= -seq_old_max_diff || seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { if (!batadv_has_timed_out(*last_reset, BATADV_RESET_PROTECTION_MS)) return 1;

*last_reset = jiffies; + if (protection_started) + *protection_started = true; batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "old packet received, start protection\n"); } @@ -1073,7 +1079,8 @@ int batadv_recv_bcast_packet(struct sk_buff *skb,

/* check whether the packet is old and the host just restarted. */ if (batadv_window_protected(bat_priv, seq_diff, - &orig_node->bcast_seqno_reset)) + BATADV_BCAST_MAX_AGE, + &orig_node->bcast_seqno_reset, NULL)) goto spin_unlock;

/* mark broadcast in flood history, update window position diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h index 204bbe4..5315fb3 100644 --- a/net/batman-adv/routing.h +++ b/net/batman-adv/routing.h @@ -52,6 +52,7 @@ batadv_find_router(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, struct batadv_hard_iface *recv_if); int batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, - unsigned long *last_reset); + s32 seq_old_max_diff, unsigned long *last_reset, + bool *protection_started);

#endif /* _NET_BATMAN_ADV_ROUTING_H_ */