nfsd: fix IPv6 address handling in the DRC

Currently, it only stores the first 16 bytes of any address. struct
sockaddr_in6 is 28 bytes however, so we're currently ignoring the last
12 bytes of the address.

Expand the c_addr field to a sockaddr_in6, and cast it to a sockaddr_in
as necessary. Also fix the comparitor to use the existing RPC
helpers for this.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index 34206b84d8da..47354a25a927 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -263,7 +263,9 @@ static inline bool __rpc_copy_addr6(struct sockaddr *dst,
  * @sap1: first sockaddr
  * @sap2: second sockaddr
  *
- * Just compares the family and address portion. Ignores port, scope, etc.
+ * Just compares the family and address portion. Ignores port, but
+ * compares the scope if it's a link-local address.
+ *
  * Returns true if the addrs are equal, false if they aren't.
  */
 static inline bool rpc_cmp_addr(const struct sockaddr *sap1,