From: Antonio Quartulli <antonio@meshcoding.com>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, b.a.t.m.a.n@lists.open-mesh.org,
Antonio Quartulli <antonio@meshcoding.com>,
Marek Lindner <mareklindner@neomailbox.ch>
Subject: [PATCH 1/6] batman-adv: free nf_bridge member on locally delivered skb
Date: Thu, 19 Dec 2013 01:15:27 +0100 [thread overview]
Message-ID: <1387412132-889-2-git-send-email-antonio@meshcoding.com> (raw)
In-Reply-To: <1387412132-889-1-git-send-email-antonio@meshcoding.com>
If an interface enslaved into batman-adv is a bridge (or a
virtual interface built on top of a bridge) the nf_bridge
member of the skbs reaching the soft-interface is filled
with the state about "netfilter bridge" operations.
Then, if one of such skbs is locally delivered, the nf_bridge
member should be cleaned up to avoid that the old state
could mess up with other "netfilter bridge" operations when
entering a second bridge.
This is needed because batman-adv is an encapsulation
protocol.
However at the moment skb->nf_bridge is not released at all
leading to bogus "netfilter bridge" behaviours.
Fix this by releasing skb->nf_bridge before an skb gets
delivered to the upper layer in interface_rx().
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
---
net/batman-adv/soft-interface.c | 8 ++++++++
net/batman-adv/soft-interface.h | 16 ++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 36f0508..59b7397 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -392,6 +392,14 @@ void batadv_interface_rx(struct net_device *soft_iface,
vid))
goto dropped;
+ /* Clean the netfilter state before delivering the skb.
+ * This packet may have traversed a bridge when it was encapsulated into
+ * the batman header. Now that the header has been removed, the
+ * netfilter state must be cleaned up to avoid to mess up with a
+ * possible second bridge
+ */
+ batadv_nf_bridge_skb_free(skb);
+
netif_rx(skb);
goto out;
diff --git a/net/batman-adv/soft-interface.h b/net/batman-adv/soft-interface.h
index 06fc91f..21b8573 100644
--- a/net/batman-adv/soft-interface.h
+++ b/net/batman-adv/soft-interface.h
@@ -33,4 +33,20 @@ void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *softif_vlan);
struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
unsigned short vid);
+#ifdef CONFIG_BRIDGE_NETFILTER
+/**
+ * batadv_nf_bridge_skb_free - clean the NF bridge data in an skb
+ * @skb: the skb which nf data has to be free'd
+ */
+static inline void batadv_nf_bridge_skb_free(struct sk_buff *skb)
+{
+ nf_bridge_put(skb->nf_bridge);
+ skb->nf_bridge = NULL;
+}
+#else
+static inline void batadv_nf_bridge_skb_free(struct sk_buff *skb)
+{
+}
+#endif /* CONFIG_BRIDGE_NETFILTER */
+
#endif /* _NET_BATMAN_ADV_SOFT_INTERFACE_H_ */
--
1.8.5.1
next prev parent reply other threads:[~2013-12-19 0:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-19 0:15 pull request [net]: batman-adv 2013-12-19 Antonio Quartulli
2013-12-19 0:15 ` Antonio Quartulli [this message]
2013-12-22 23:50 ` [PATCH 1/6] batman-adv: free nf_bridge member on locally delivered skb David Miller
2013-12-23 0:11 ` Antonio Quartulli
2013-12-23 0:16 ` David Miller
[not found] ` <20131222.191622.118900475665948342.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2013-12-23 0:19 ` Antonio Quartulli
2013-12-19 0:15 ` [PATCH 2/6] batman-adv: fix alignment for batadv_coded_packet Antonio Quartulli
2013-12-19 0:15 ` [PATCH 3/6] batman-adv: fix header alignment by unrolling batadv_header Antonio Quartulli
2013-12-19 0:15 ` [PATCH 4/6] batman-adv: fix size of batadv_icmp_header Antonio Quartulli
2013-12-19 0:15 ` [PATCH 5/6] batman-adv: fix size of batadv_bla_claim_dst Antonio Quartulli
2013-12-19 0:15 ` [PATCH 6/6] batman-adv: fix alignment for batadv_tvlv_tt_change Antonio Quartulli
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