lsm,selinux: pass flowi_common instead of flowi to the LSM hooks

As pointed out by Herbert in a recent related patch, the LSM hooks do
not have the necessary address family information to use the flowi
struct safely.  As none of the LSMs currently use any of the protocol
specific flowi information, replace the flowi pointers with pointers
to the address family independent flowi_common struct.

Reported-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: James Morris <jamorris@linux.microsoft.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/net/flow.h b/include/net/flow.h
index b2531df3f65f..39d0cedcddee 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -195,11 +195,21 @@ static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 	return container_of(fl4, struct flowi, u.ip4);
 }
 
+static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
+{
+	return &(flowi4_to_flowi(fl4)->u.__fl_common);
+}
+
 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 {
 	return container_of(fl6, struct flowi, u.ip6);
 }
 
+static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6)
+{
+	return &(flowi6_to_flowi(fl6)->u.__fl_common);
+}
+
 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 {
 	return container_of(fldn, struct flowi, u.dn);