[SCSI] libosd: OSD Security processing stubs

Layout the signing of OSD's CDB and all-data security modes. The actual
code for signing the data and CDB is missing, but the code flow and the extra
buffer segments are all in place.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Reviewed-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index b982d767bf99..6849f269cd1b 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -111,6 +111,14 @@ static osd_cdb_offset osd_req_encode_offset(struct osd_request *or,
                                   OSDv1_OFFSET_MIN_SHIFT, OSD_OFFSET_MAX_SHIFT);
 }
 
+static struct osd_security_parameters *
+_osd_req_sec_params(struct osd_request *or)
+{
+        struct osd_cdb *ocdb = &or->cdb;
+
+        return &ocdb->v1.sec_params;
+}
+
 void osd_dev_init(struct osd_dev *osdd, struct scsi_device *scsi_device)
 {
         memset(osdd, 0, sizeof(*osdd));
@@ -799,6 +807,64 @@ static int _osd_req_finalize_attr_page(struct osd_request *or)
         return ret;
 }
 
+static int _osd_req_finalize_data_integrity(struct osd_request *or,
+        bool has_in, bool has_out, const u8 *cap_key)
+{
+        struct osd_security_parameters *sec_parms = _osd_req_sec_params(or);
+        int ret;
+
+        if (!osd_is_sec_alldata(sec_parms))
+                return 0;
+
+        if (has_out) {
+                struct _osd_req_data_segment seg = {
+                        .buff = &or->out_data_integ,
+                        .total_bytes = sizeof(or->out_data_integ),
+                };
+                unsigned pad;
+
+                or->out_data_integ.data_bytes = cpu_to_be64(
+                        or->out.bio ? or->out.bio->bi_size : 0);
+                or->out_data_integ.set_attributes_bytes = cpu_to_be64(
+                        or->set_attr.total_bytes);
+                or->out_data_integ.get_attributes_bytes = cpu_to_be64(
+                        or->enc_get_attr.total_bytes);
+
+                sec_parms->data_out_integrity_check_offset =
+                        osd_req_encode_offset(or, or->out.total_bytes, &pad);
+
+                ret = _req_append_segment(or, pad, &seg, or->out.last_seg,
+                                          &or->out);
+                if (ret)
+                        return ret;
+                or->out.last_seg = NULL;
+
+                /* they are now all chained to request sign them all together */
+                osd_sec_sign_data(&or->out_data_integ, or->out.req->bio,
+                                  cap_key);
+        }
+
+        if (has_in) {
+                struct _osd_req_data_segment seg = {
+                        .buff = &or->in_data_integ,
+                        .total_bytes = sizeof(or->in_data_integ),
+                };
+                unsigned pad;
+
+                sec_parms->data_in_integrity_check_offset =
+                        osd_req_encode_offset(or, or->in.total_bytes, &pad);
+
+                ret = _req_append_segment(or, pad, &seg, or->in.last_seg,
+                                          &or->in);
+                if (ret)
+                        return ret;
+
+                or->in.last_seg = NULL;
+        }
+
+        return 0;
+}
+
 /*
  * osd_finalize_request and helpers
  */
@@ -919,6 +985,12 @@ int osd_finalize_request(struct osd_request *or,
                 }
         }
 
+        ret = _osd_req_finalize_data_integrity(or, has_in, has_out, cap_key);
+        if (ret)
+                return ret;
+
+        osd_sec_sign_cdb(&or->cdb, cap_key);
+
         or->request->cmd = or->cdb.buff;
         or->request->cmd_len = _osd_req_cdb_len(or);
 
@@ -984,6 +1056,20 @@ void osd_set_caps(struct osd_cdb *cdb, const void *caps)
         memcpy(&cdb->v1.caps, caps, OSDv1_CAP_LEN);
 }
 
+bool osd_is_sec_alldata(struct osd_security_parameters *sec_parms __unused)
+{
+        return false;
+}
+
+void osd_sec_sign_cdb(struct osd_cdb *ocdb __unused, const u8 *cap_key __unused)
+{
+}
+
+void osd_sec_sign_data(void *data_integ __unused,
+                       struct bio *bio __unused, const u8 *cap_key __unused)
+{
+}
+
 /*
  * Declared in osd_protocol.h
  * 4.12.5 Data-In and Data-Out buffer offsets