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authorMike Christie <michaelc@cs.wisc.edu>2006-08-31 18:09:32 -0400
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-09-02 13:37:32 -0500
commitca5186842a6d85e982e3d572ecd407453d0c5116 (patch)
tree6eb680933750cf330308ab2c748a3d0e85c30c53 /drivers/scsi/iscsi_tcp.c
parentdb98ccde0881b8247acb52dece6d94ed770a7aa5 (diff)
[SCSI] iscsi_tcp: fix partial digest recv
When a digest is spread across two network buffers, we currently ignore this and try to check the digest with the partial buffer. Or course this fails. This patch has use iscsi_tcp_copy to copy the whole digest before testing it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/iscsi_tcp.c')
-rw-r--r--drivers/scsi/iscsi_tcp.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 5d292d0b65ec..d91e8949c71e 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -648,10 +648,9 @@ iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
* byte counters.
**/
static inline int
-iscsi_tcp_copy(struct iscsi_conn *conn)
+iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int buf_size = tcp_conn->in.datalen;
int buf_left = buf_size - tcp_conn->data_copied;
int size = min(tcp_conn->in.copy, buf_left);
int rc;
@@ -812,7 +811,7 @@ iscsi_data_recv(struct iscsi_conn *conn)
* Collect data segment to the connection's data
* placeholder
*/
- if (iscsi_tcp_copy(conn)) {
+ if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) {
rc = -EAGAIN;
goto exit;
}
@@ -899,10 +898,15 @@ more:
debug_tcp("extra data_recv offset %d copy %d\n",
tcp_conn->in.offset, tcp_conn->in.copy);
- skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
- &recv_digest, 4);
- tcp_conn->in.offset += 4;
- tcp_conn->in.copy -= 4;
+ rc = iscsi_tcp_copy(conn, sizeof(uint32_t));
+ if (rc) {
+ if (rc == -EAGAIN)
+ goto again;
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ return 0;
+ }
+
+ memcpy(&recv_digest, conn->data, sizeof(uint32_t));
if (recv_digest != tcp_conn->in.datadgst) {
debug_tcp("iscsi_tcp: data digest error!"
"0x%x != 0x%x\n", recv_digest,
@@ -942,9 +946,10 @@ more:
&sg, 1);
}
crypto_digest_final(tcp_conn->rx_tfm,
- (u8 *) & tcp_conn->in.datadgst);
+ (u8 *) &tcp_conn->in.datadgst);
debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
+ tcp_conn->data_copied = 0;
} else
tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
}