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From: Antonio Quartulli <ordex@autistici.org>
To: "B.A.T.M.A.N" <b.a.t.m.a.n@lists.open-mesh.org>
Subject: [B.A.T.M.A.N.] [PATCHv4 3/4] batman-adv: implement AP-isolation on the sender side
Date: Thu,  7 Jul 2011 15:35:37 +0200	[thread overview]
Message-ID: <1310045738-30950-4-git-send-email-ordex@autistici.org> (raw)
In-Reply-To: <1310045738-30950-1-git-send-email-ordex@autistici.org>

If a node has to send a packet issued by a WIFI client to another WIFI client,
the packet is dropped.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
---
 routing.c           |    2 +-
 soft-interface.c    |    3 ++-
 translation-table.c |   28 +++++++++++++++++++++-------
 translation-table.h |    2 +-
 unicast.c           |    6 ++++--
 5 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/routing.c b/routing.c
index 0d7c1c2..e5dd94d 100644
--- a/routing.c
+++ b/routing.c
@@ -1536,7 +1536,7 @@ static int check_unicast_ttvn(struct bat_priv *bat_priv,
 
 		ethhdr = (struct ethhdr *)(skb->data +
 			sizeof(struct unicast_packet));
-		orig_node = transtable_search(bat_priv, ethhdr->h_dest);
+		orig_node = transtable_search(bat_priv, NULL, ethhdr->h_dest);
 
 		if (!orig_node) {
 			if (!is_my_client(bat_priv, ethhdr->h_dest))
diff --git a/soft-interface.c b/soft-interface.c
index 839ded9..ef2fad5 100644
--- a/soft-interface.c
+++ b/soft-interface.c
@@ -597,7 +597,8 @@ static int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
 	/* Register the client MAC in the transtable */
 	tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
 
-	orig_node = transtable_search(bat_priv, ethhdr->h_dest);
+	orig_node = transtable_search(bat_priv, ethhdr->h_source,
+				      ethhdr->h_dest);
 	if (is_multicast_ether_addr(ethhdr->h_dest) ||
 				(orig_node && orig_node->gw_flags)) {
 		ret = gw_is_target(bat_priv, skb, orig_node);
diff --git a/translation-table.c b/translation-table.c
index 9f0f3f1..0b25fd9 100644
--- a/translation-table.c
+++ b/translation-table.c
@@ -794,29 +794,43 @@ static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry,
 }
 
 struct orig_node *transtable_search(struct bat_priv *bat_priv,
-				    const uint8_t *addr)
+				    const uint8_t *src, const uint8_t *addr)
 {
-	struct tt_global_entry *tt_global_entry;
+	struct tt_local_entry *tt_local_entry = NULL;
+	struct tt_global_entry *tt_global_entry = NULL;
 	struct orig_node *orig_node = NULL;
 
-	tt_global_entry = tt_global_hash_find(bat_priv, addr);
+	if (src && atomic_read(&bat_priv->ap_isolation)) {
+		tt_local_entry = tt_local_hash_find(bat_priv, src);
+		if (!tt_local_entry)
+			goto out;
+	}
 
+	tt_global_entry = tt_global_hash_find(bat_priv, addr);
 	if (!tt_global_entry)
 		goto out;
 
+	/* check whether the clients should not communicate due to AP
+	 * isolation */
+	if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))
+		goto out;
+
 	if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
-		goto free_tt;
+		goto out;
 
 	/* A global client marked as PENDING has already moved from that
 	 * originator */
 	if (tt_global_entry->flags & TT_CLIENT_PENDING)
-		goto free_tt;
+		goto out;
 
 	orig_node = tt_global_entry->orig_node;
 
-free_tt:
-	tt_global_entry_free_ref(tt_global_entry);
 out:
+	if (tt_global_entry)
+		tt_global_entry_free_ref(tt_global_entry);
+	if (tt_local_entry)
+		tt_local_entry_free_ref(tt_local_entry);
+
 	return orig_node;
 }
 
diff --git a/translation-table.h b/translation-table.h
index ba2d76d..fe28d14 100644
--- a/translation-table.h
+++ b/translation-table.h
@@ -43,7 +43,7 @@ void tt_global_del(struct bat_priv *bat_priv,
 		   struct orig_node *orig_node, const unsigned char *addr,
 		   const char *message, bool roaming);
 struct orig_node *transtable_search(struct bat_priv *bat_priv,
-				    const uint8_t *addr);
+				    const uint8_t *src, const uint8_t *addr);
 void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node,
 			 const unsigned char *tt_buff, uint8_t tt_num_changes);
 uint16_t tt_local_crc(struct bat_priv *bat_priv);
diff --git a/unicast.c b/unicast.c
index 32b125f..07d1c1d 100644
--- a/unicast.c
+++ b/unicast.c
@@ -299,8 +299,10 @@ int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
 			goto find_router;
 	}
 
-	/* check for tt host - increases orig_node refcount */
-	orig_node = transtable_search(bat_priv, ethhdr->h_dest);
+	/* check for tt host - increases orig_node refcount.
+	 * returns NULL in case of AP isolation */
+	orig_node = transtable_search(bat_priv, ethhdr->h_source,
+				      ethhdr->h_dest);
 
 find_router:
 	/**
-- 
1.7.3.4


  parent reply	other threads:[~2011-07-07 13:35 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-07 13:35 [B.A.T.M.A.N.] [PATCHv4 0/3] Implement the AP-Isolation mechanism Antonio Quartulli
2011-07-07 13:35 ` [B.A.T.M.A.N.] [PATCHv4 1/4] batman-adv: detect clients connected through a 802.11 device Antonio Quartulli
2011-07-25 20:11   ` Marek Lindner
2011-07-07 13:35 ` [B.A.T.M.A.N.] [PATCHv4 2/4] batman-adv: implement AP-isolation on the receiver side Antonio Quartulli
2011-07-25 20:17   ` Marek Lindner
2011-07-07 13:35 ` Antonio Quartulli [this message]
2011-07-25 20:19   ` [B.A.T.M.A.N.] [PATCHv4 3/4] batman-adv: implement AP-isolation on the sender side Marek Lindner
2011-07-07 13:35 ` [B.A.T.M.A.N.] [PATCHv4 4/4] batman-adv: print client flags in the local/global transtables output Antonio Quartulli
2011-07-25 20:24   ` Marek Lindner

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