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-rw-r--r--include/net/dst.h15
-rw-r--r--net/ipv4/route.c6
-rw-r--r--net/ipv6/ip6_output.c4
-rw-r--r--net/xfrm/xfrm_policy.c18
4 files changed, 36 insertions, 7 deletions
diff --git a/include/net/dst.h b/include/net/dst.h
index 77eb53fabfb0..2a90573276c9 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -476,7 +476,16 @@ static inline struct dst_entry *xfrm_lookup(struct net *net,
int flags)
{
return dst_orig;
-}
+}
+
+static inline struct dst_entry *xfrm_lookup_route(struct net *net,
+ struct dst_entry *dst_orig,
+ const struct flowi *fl,
+ struct sock *sk,
+ int flags)
+{
+ return dst_orig;
+}
static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
{
@@ -488,6 +497,10 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
const struct flowi *fl, struct sock *sk,
int flags);
+struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
+ const struct flowi *fl, struct sock *sk,
+ int flags);
+
/* skb attached with this dst needs transformation if dst->xfrm is valid */
static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
{
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index ca5a01ed8ed6..487bb6252520 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2268,9 +2268,9 @@ struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4,
return rt;
if (flp4->flowi4_proto)
- rt = (struct rtable *) xfrm_lookup(net, &rt->dst,
- flowi4_to_flowi(flp4),
- sk, 0);
+ rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst,
+ flowi4_to_flowi(flp4),
+ sk, 0);
return rt;
}
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 073e5a6fc631..12f7ef0f243a 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1008,7 +1008,7 @@ struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
if (final_dst)
fl6->daddr = *final_dst;
- return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
+ return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
}
EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow);
@@ -1040,7 +1040,7 @@ struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
if (final_dst)
fl6->daddr = *final_dst;
- return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
+ return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
}
EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 1d5c7bf29938..9d4fa4c1e1b4 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2155,7 +2155,7 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
xfrm_pols_put(pols, drop_pols);
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
- return make_blackhole(net, family, dst_orig);
+ return ERR_PTR(-EREMOTE);
}
err = -EAGAIN;
@@ -2212,6 +2212,22 @@ dropdst:
}
EXPORT_SYMBOL(xfrm_lookup);
+/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
+ * Otherwise we may send out blackholed packets.
+ */
+struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
+ const struct flowi *fl,
+ struct sock *sk, int flags)
+{
+ struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk, flags);
+
+ if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
+ return make_blackhole(net, dst_orig->ops->family, dst_orig);
+
+ return dst;
+}
+EXPORT_SYMBOL(xfrm_lookup_route);
+
static inline int
xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
{