summaryrefslogtreecommitdiff
path: root/include/net
diff options
context:
space:
mode:
authorJulian Anastasov <ja@ssi.bg>2012-02-04 13:04:46 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-02-29 16:31:00 -0800
commitf4df037cf3ca933c941a0f87a9c9ec542c88031c (patch)
tree039392ad09ff958de068c63a1a3a1591456dc085 /include/net
parentd14d408060c6a2d35c115f8bbded2faa41d21de7 (diff)
ipv4: reset flowi parameters on route connect
[ Upstream commit e6b45241c57a83197e5de9166b3b0d32ac562609 ] Eric Dumazet found that commit 813b3b5db83 (ipv4: Use caller's on-stack flowi as-is in output route lookups.) that comes in 3.0 added a regression. The problem appears to be that resulting flowi4_oif is used incorrectly as input parameter to some routing lookups. The result is that when connecting to local port without listener if the IP address that is used is not on a loopback interface we incorrectly assign RTN_UNICAST to the output route because no route is matched by oif=lo. The RST packet can not be sent immediately by tcp_v4_send_reset because it expects RTN_LOCAL. So, change ip_route_connect and ip_route_newports to update the flowi4 fields that are input parameters because we do not want unnecessary binding to oif. To make it clear what are the input parameters that can be modified during lookup and to show which fields of floiw4 are reused add a new function to update the flowi4 structure: flowi4_update_output. Thanks to Yurij M. Plotnikov for providing a bug report including a program to reproduce the problem. Thanks to Eric Dumazet for tracking the problem down to tcp_v4_send_reset and providing initial fix. Reported-by: Yurij M. Plotnikov <Yurij.Plotnikov@oktetlabs.ru> Signed-off-by: Julian Anastasov <ja@ssi.bg> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/flow.h10
-rw-r--r--include/net/route.h4
2 files changed, 14 insertions, 0 deletions
diff --git a/include/net/flow.h b/include/net/flow.h
index 57f15a7f1cdd..2a7eefddee64 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -90,6 +90,16 @@ static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
fl4->fl4_dport = dport;
fl4->fl4_sport = sport;
}
+
+/* Reset some input parameters after previous lookup */
+static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
+ __be32 daddr, __be32 saddr)
+{
+ fl4->flowi4_oif = oif;
+ fl4->flowi4_tos = tos;
+ fl4->daddr = daddr;
+ fl4->saddr = saddr;
+}
struct flowi6 {
diff --git a/include/net/route.h b/include/net/route.h
index 91855d185b53..b1c0d5b564c2 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -270,6 +270,7 @@ static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
if (IS_ERR(rt))
return rt;
ip_rt_put(rt);
+ flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
}
security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
return ip_route_output_flow(net, fl4, sk);
@@ -284,6 +285,9 @@ static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable
fl4->fl4_dport = dport;
fl4->fl4_sport = sport;
ip_rt_put(rt);
+ flowi4_update_output(fl4, sk->sk_bound_dev_if,
+ RT_CONN_FLAGS(sk), fl4->daddr,
+ fl4->saddr);
security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
return ip_route_output_flow(sock_net(sk), fl4, sk);
}