drbd: Don't go into StandAlone mode when authentification failes because of network...

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index dbd4519..e3716fa 100644 (file)
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -878,9 +878,13 @@ retry:
 
        if (mdev->cram_hmac_tfm) {
                /* drbd_request_state(mdev, NS(conn, WFAuth)); */
-               if (!drbd_do_auth(mdev)) {
+               switch (drbd_do_auth(mdev)) {
+               case -1:
                        dev_err(DEV, "Authentication of peer failed\n");
                        return -1;
+               case 0:
+                       dev_err(DEV, "Authentication of peer failed, trying again.\n");
+                       return 0;
                }
        }
 
@@ -3831,10 +3835,17 @@ static int drbd_do_auth(struct drbd_conf *mdev)
 {
        dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n");
        dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n");
-       return 0;
+       return -1;
 }
 #else
 #define CHALLENGE_LEN 64
+
+/* Return value:
+       1 - auth succeeded,
+       0 - failed, try again (network error),
+       -1 - auth failed, don't try again.
+*/
+
 static int drbd_do_auth(struct drbd_conf *mdev)
 {
        char my_challenge[CHALLENGE_LEN];  /* 64 Bytes... */
@@ -3855,7 +3866,7 @@ static int drbd_do_auth(struct drbd_conf *mdev)
                                (u8 *)mdev->net_conf->shared_secret, key_len);
        if (rv) {
                dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv);
-               rv = 0;
+               rv = -1;
                goto fail;
        }
 
@@ -3878,14 +3889,14 @@ static int drbd_do_auth(struct drbd_conf *mdev)
 
        if (p.length > CHALLENGE_LEN*2) {
                dev_err(DEV, "expected AuthChallenge payload too big.\n");
-               rv = 0;
+               rv = -1;
                goto fail;
        }
 
        peers_ch = kmalloc(p.length, GFP_NOIO);
        if (peers_ch == NULL) {
                dev_err(DEV, "kmalloc of peers_ch failed\n");
-               rv = 0;
+               rv = -1;
                goto fail;
        }
 
@@ -3901,7 +3912,7 @@ static int drbd_do_auth(struct drbd_conf *mdev)
        response = kmalloc(resp_size, GFP_NOIO);
        if (response == NULL) {
                dev_err(DEV, "kmalloc of response failed\n");
-               rv = 0;
+               rv = -1;
                goto fail;
        }
 
@@ -3911,7 +3922,7 @@ static int drbd_do_auth(struct drbd_conf *mdev)
        rv = crypto_hash_digest(&desc, &sg, sg.length, response);
        if (rv) {
                dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
-               rv = 0;
+               rv = -1;
                goto fail;
        }
 
@@ -3947,7 +3958,7 @@ static int drbd_do_auth(struct drbd_conf *mdev)
        right_response = kmalloc(resp_size, GFP_NOIO);
        if (right_response == NULL) {
                dev_err(DEV, "kmalloc of right_response failed\n");
-               rv = 0;
+               rv = -1;
                goto fail;
        }
 
@@ -3956,7 +3967,7 @@ static int drbd_do_auth(struct drbd_conf *mdev)
        rv = crypto_hash_digest(&desc, &sg, sg.length, right_response);
        if (rv) {
                dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
-               rv = 0;
+               rv = -1;
                goto fail;
        }
 
@@ -3965,6 +3976,8 @@ static int drbd_do_auth(struct drbd_conf *mdev)
        if (rv)
                dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n",
                     resp_size, mdev->net_conf->cram_hmac_alg);
+       else
+               rv = -1;
 
  fail:
        kfree(peers_ch);