nfsd: add support for NFSv4 callbacks over IPv6

The framework to add this is all in place. Now, add the code to allow
support for establishing a callback channel on an IPv6 socket.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 96a7423..9ec0ca1 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -901,9 +901,16 @@ static void
 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 {
        struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
-
-       /* Currently, we only support tcp for the callback channel */
-       if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
+       unsigned short expected_family;
+
+       /* Currently, we only support tcp and tcp6 for the callback channel */
+       if (se->se_callback_netid_len == 3 &&
+           !memcmp(se->se_callback_netid_val, "tcp", 3))
+               expected_family = AF_INET;
+       else if (se->se_callback_netid_len == 4 &&
+                !memcmp(se->se_callback_netid_val, "tcp6", 4))
+               expected_family = AF_INET6;
+       else
                goto out_err;
 
        cb->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val,
@@ -911,7 +918,7 @@ gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
                                            (struct sockaddr *) &cb->cb_addr,
                                            sizeof(cb->cb_addr));
 
-       if (!cb->cb_addrlen || cb->cb_addr.ss_family != AF_INET)
+       if (!cb->cb_addrlen || cb->cb_addr.ss_family != expected_family)
                goto out_err;
 
        cb->cb_minorversion = 0;