ipv6: Consolidate route lookup sequences.
Route lookups follow a general pattern in the ipv6 code wherein
we first find the non-IPSEC route, potentially override the
flow destination address due to ipv6 options settings, and then
finally make an IPSEC search using either xfrm_lookup() or
__xfrm_lookup().
__xfrm_lookup() is used when we want to generate a blackhole route
if the key manager needs to resolve the IPSEC rules (in this case
-EREMOTE is returned and the original 'dst' is left unchanged).
Otherwise plain xfrm_lookup() is used and when asynchronous IPSEC
resolution is necessary, we simply fail the lookup completely.
All of these cases are encapsulated into two routines,
ip6_dst_lookup_flow and ip6_sk_dst_lookup_flow. The latter of which
handles unconnected UDP datagram sockets.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 4a3cd2c..1fc5631 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -512,12 +512,17 @@
extern int ip6_dst_lookup(struct sock *sk,
struct dst_entry **dst,
struct flowi *fl);
+extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
+ struct flowi *fl,
+ const struct in6_addr *final_dst,
+ bool want_blackhole);
+extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
+ struct flowi *fl,
+ const struct in6_addr *final_dst,
+ bool want_blackhole);
extern int ip6_dst_blackhole(struct sock *sk,
struct dst_entry **dst,
struct flowi *fl);
-extern int ip6_sk_dst_lookup(struct sock *sk,
- struct dst_entry **dst,
- struct flowi *fl);
/*
* skb processing functions