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authorDavid S. Miller <davem@davemloft.net>2009-01-04 19:04:39 -0500
committerDavid S. Miller <davem@davemloft.net>2009-01-04 19:04:39 -0500
commit14deae41566b5cdd992c01d0069518ced5227c83 (patch)
treed15c3dfabdc3ccf10997487c29df35fa58387e55 /include/net
parenteb4dea5853046727bfbb579f0c9a8cae7369f7c6 (diff)
ipv6: Fix sporadic sendmsg -EINVAL when sending to multicast groups.
Thanks to excellent diagnosis by Eduard Guzovsky. The core problem is that on a network with lots of active multicast traffic, the neighbour cache can fill up. If we try to allocate a new route and thus neighbour cache entry, the bog-standard GC attempt the neighbour layer does in ineffective because route entries hold a reference to the existing neighbour entries and GC can only liberate entries with no references. IPV4 already has a way to handle this, by doing a route cache GC in such situations (when neigh attach returns -ENOBUFS). So simply mimick this on the ipv6 side. Tested-by: Eduard Guzovsky <eguzovsky@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/ndisc.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index ce532f2222ce..1459ed3e2697 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -155,9 +155,9 @@ static inline struct neighbour * ndisc_get_neigh(struct net_device *dev, const s
155{ 155{
156 156
157 if (dev) 157 if (dev)
158 return __neigh_lookup(&nd_tbl, addr, dev, 1); 158 return __neigh_lookup_errno(&nd_tbl, addr, dev);
159 159
160 return NULL; 160 return ERR_PTR(-ENODEV);
161} 161}
162 162
163 163