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-rw-r--r--net/core/dst.c59
1 files changed, 42 insertions, 17 deletions
diff --git a/net/core/dst.c b/net/core/dst.c
index 0c01bd8d9d81..fb3bcba87744 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -237,37 +237,62 @@ void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old)
}
EXPORT_SYMBOL(__dst_destroy_metrics_generic);
-static struct dst_ops md_dst_ops = {
- .family = AF_UNSPEC,
-};
+struct dst_entry *dst_blackhole_check(struct dst_entry *dst, u32 cookie)
+{
+ return NULL;
+}
-static int dst_md_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
+u32 *dst_blackhole_cow_metrics(struct dst_entry *dst, unsigned long old)
{
- WARN_ONCE(1, "Attempting to call output on metadata dst\n");
- kfree_skb(skb);
- return 0;
+ return NULL;
}
-static int dst_md_discard(struct sk_buff *skb)
+struct neighbour *dst_blackhole_neigh_lookup(const struct dst_entry *dst,
+ struct sk_buff *skb,
+ const void *daddr)
{
- WARN_ONCE(1, "Attempting to call input on metadata dst\n");
- kfree_skb(skb);
- return 0;
+ return NULL;
+}
+
+void dst_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb, u32 mtu,
+ bool confirm_neigh)
+{
+}
+EXPORT_SYMBOL_GPL(dst_blackhole_update_pmtu);
+
+void dst_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb)
+{
+}
+EXPORT_SYMBOL_GPL(dst_blackhole_redirect);
+
+unsigned int dst_blackhole_mtu(const struct dst_entry *dst)
+{
+ unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
+
+ return mtu ? : dst->dev->mtu;
}
+EXPORT_SYMBOL_GPL(dst_blackhole_mtu);
+
+static struct dst_ops dst_blackhole_ops = {
+ .family = AF_UNSPEC,
+ .neigh_lookup = dst_blackhole_neigh_lookup,
+ .check = dst_blackhole_check,
+ .cow_metrics = dst_blackhole_cow_metrics,
+ .update_pmtu = dst_blackhole_update_pmtu,
+ .redirect = dst_blackhole_redirect,
+ .mtu = dst_blackhole_mtu,
+};
static void __metadata_dst_init(struct metadata_dst *md_dst,
enum metadata_type type, u8 optslen)
-
{
struct dst_entry *dst;
dst = &md_dst->dst;
- dst_init(dst, &md_dst_ops, NULL, 1, DST_OBSOLETE_NONE,
+ dst_init(dst, &dst_blackhole_ops, NULL, 1, DST_OBSOLETE_NONE,
DST_METADATA | DST_NOCOUNT);
-
- dst->input = dst_md_discard;
- dst->output = dst_md_discard_out;
-
memset(dst + 1, 0, sizeof(*md_dst) + optslen - sizeof(*dst));
md_dst->type = type;
}