aboutsummaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
authorPeter Huang (Peng) <peter.huangpeng@huawei.com>2012-04-19 20:12:51 +0000
committerDavid S. Miller <davem@davemloft.net>2012-04-24 00:16:24 -0400
commita881e963c7fe1f226e991ee9bbe8907acda93294 (patch)
tree5d2b2c01097300377821132f743cddd4fc90fed6 /include
parent4d634ca35a8b38530b134ae92bc9e3cc9c23c030 (diff)
downloadlinaro-lsk-a881e963c7fe1f226e991ee9bbe8907acda93294.tar.gz
set fake_rtable's dst to NULL to avoid kernel Oops
bridge: set fake_rtable's dst to NULL to avoid kernel Oops when bridge is deleted before tap/vif device's delete, kernel may encounter an oops because of NULL reference to fake_rtable's dst. Set fake_rtable's dst to NULL before sending packets out can solve this problem. v4 reformat, change br_drop_fake_rtable(skb) to {} v3 enrich commit header v2 introducing new flag DST_FAKE_RTABLE to dst_entry struct. [ Use "do { } while (0)" for nop br_drop_fake_rtable() implementation -DaveM ] Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Peter Huang <peter.huangpeng@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/netfilter_bridge.h9
-rw-r--r--include/net/dst.h1
2 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h
index 0ddd161f3b0..31d2844e657 100644
--- a/include/linux/netfilter_bridge.h
+++ b/include/linux/netfilter_bridge.h
@@ -104,9 +104,18 @@ struct bridge_skb_cb {
} daddr;
};
+static inline void br_drop_fake_rtable(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb_dst(skb);
+
+ if (dst && (dst->flags & DST_FAKE_RTABLE))
+ skb_dst_drop(skb);
+}
+
#else
#define nf_bridge_maybe_copy_header(skb) (0)
#define nf_bridge_pad(skb) (0)
+#define br_drop_fake_rtable(skb) do { } while (0)
#endif /* CONFIG_BRIDGE_NETFILTER */
#endif /* __KERNEL__ */
diff --git a/include/net/dst.h b/include/net/dst.h
index ff4da42fcfc..bed833d9796 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -59,6 +59,7 @@ struct dst_entry {
#define DST_NOCACHE 0x0010
#define DST_NOCOUNT 0x0020
#define DST_NOPEER 0x0040
+#define DST_FAKE_RTABLE 0x0080
short error;
short obsolete;