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| author | Julian Anastasov <ja@ssi.bg> | 2011-08-07 22:20:20 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-08-07 22:20:20 -0700 |
| commit | d547f727df86059104af2234804fdd538e112015 (patch) | |
| tree | be54058b51ae121709242553e4aefde5662f734c /net/ipv4/route.c | |
| parent | 025890b4ed433b9c9e0f221bb806d42d049c87fe (diff) | |
| download | linux-stable-d547f727df86059104af2234804fdd538e112015.tar.gz linux-stable-d547f727df86059104af2234804fdd538e112015.tar.bz2 linux-stable-d547f727df86059104af2234804fdd538e112015.zip | |
ipv4: fix the reusing of routing cache entries
compare_keys and ip_route_input_common rely on
rt_oif for distinguishing of input and output routes
with same keys values. But sometimes the input route has
also same hash chain (keyed by iif != 0) with the output
routes (keyed by orig_oif=0). Problem visible if running
with small number of rhash_entries.
Fix them to use rt_route_iif instead. By this way
input route can not be returned to users that request
output route.
The patch fixes the ip_rt_bug errors that were
reported in ip_local_out context, mostly for 255.255.255.255
destinations.
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/route.c')
| -rw-r--r-- | net/ipv4/route.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index e3dec1c9f09d..cb7efe0567f0 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -731,6 +731,7 @@ static inline int compare_keys(struct rtable *rt1, struct rtable *rt2) ((__force u32)rt1->rt_key_src ^ (__force u32)rt2->rt_key_src) | (rt1->rt_mark ^ rt2->rt_mark) | (rt1->rt_key_tos ^ rt2->rt_key_tos) | + (rt1->rt_route_iif ^ rt2->rt_route_iif) | (rt1->rt_oif ^ rt2->rt_oif) | (rt1->rt_iif ^ rt2->rt_iif)) == 0; } @@ -2321,8 +2322,8 @@ int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr, if ((((__force u32)rth->rt_key_dst ^ (__force u32)daddr) | ((__force u32)rth->rt_key_src ^ (__force u32)saddr) | (rth->rt_iif ^ iif) | - rth->rt_oif | (rth->rt_key_tos ^ tos)) == 0 && + rt_is_input_route(rth) && rth->rt_mark == skb->mark && net_eq(dev_net(rth->dst.dev), net) && !rt_is_expired(rth)) { |