ipv6: Normalize arguments to ip6_dst_blackhole().

Return a dst pointer which is potentitally error encoded.

Don't pass original dst pointer by reference, pass a struct net
instead of a socket, and elide the flow argument since it is
unnecessary.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 8f78aac..5d125c1 100644 (file)
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -520,9 +520,8 @@ extern struct dst_entry *   ip6_sk_dst_lookup_flow(struct sock *sk,
                                                       struct flowi *fl,
                                                       const struct in6_addr *final_dst,
                                                       bool can_sleep);
-extern int                     ip6_dst_blackhole(struct sock *sk,
-                                                 struct dst_entry **dst,
-                                                 struct flowi *fl);
+extern struct dst_entry *      ip6_dst_blackhole(struct net *net,
+                                                 struct dst_entry *orig_dst);
 
 /*
  *     skb processing functions

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index faf7b9d..ac16f3b 100644 (file)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1029,7 +1029,7 @@ struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi *fl,
                fl->flags |= FLOWI_FLAG_CAN_SLEEP;
                err = __xfrm_lookup(sock_net(sk), &dst, fl, sk, 0);
                if (err == -EREMOTE)
-                       err = ip6_dst_blackhole(sk, &dst, fl);
+                       return ip6_dst_blackhole(sock_net(sk), dst);
                if (err)
                        return ERR_PTR(err);
        } else {
@@ -1074,7 +1074,7 @@ struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi *fl,
                fl->flags |= FLOWI_FLAG_CAN_SLEEP;
                err = __xfrm_lookup(sock_net(sk), &dst, fl, sk, 0);
                if (err == -EREMOTE)
-                       err = ip6_dst_blackhole(sk, &dst, fl);
+                       return ip6_dst_blackhole(sock_net(sk), dst);
                if (err)
                        return ERR_PTR(err);
        } else {

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 7e9443f..cf6fdea 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -870,11 +870,10 @@ struct dst_entry * ip6_route_output(struct net *net, struct sock *sk,
 
 EXPORT_SYMBOL(ip6_route_output);
 
-int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl)
+struct dst_entry *ip6_dst_blackhole(struct net *net, struct dst_entry *dst_orig)
 {
-       struct rt6_info *ort = (struct rt6_info *) *dstp;
-       struct rt6_info *rt = (struct rt6_info *)
-               dst_alloc(&ip6_dst_blackhole_ops, 1);
+       struct rt6_info *rt = dst_alloc(&ip6_dst_blackhole_ops, 1);
+       struct rt6_info *ort = (struct rt6_info *) dst_orig;
        struct dst_entry *new = NULL;
 
        if (rt) {
@@ -905,9 +904,8 @@ int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl
                dst_free(new);
        }
 
-       dst_release(*dstp);
-       *dstp = new;
-       return new ? 0 : -ENOMEM;
+       dst_release(dst_orig);
+       return new ? new : ERR_PTR(-ENOMEM);
 }
 EXPORT_SYMBOL_GPL(ip6_dst_blackhole);