qcacld-3.0: Fix emergency roaming failure

DUT perform FT-IM association instead of FT roaming to
process emergency deauth from connected AP.

In the case of FT-IM association, FW sends assoc requests
instead of re-assoc requests in roam sync indication to
host. Host truncate fixed parameters from assoc req and
forward frame tagged parameters to supplicants.

In re-assoc request fixed params length is 10bytes and
in assoc request, fixed param length is 4 bytes.
Currently host always truncating 10 bytes of assoc/re-assoc
frame present in roam sync ind and forward it to supplicant.

This results in extra first 6 bytes of assoc frame get stripped
by host. Due to this supplicant is not able to parse frame
content properly. This leads to 11r roaming failure.

As in case of FT-IM association roaming, FW forward assoc req
in roam sync ind, Host should truncate 4 bytes of fixed
parameters.

Fix is to ensure that host truncate only 4 bytes if assoc
request present in roam sync ind data.

Change-Id: Ie1352e41f9caffc4a28ed046330a73f303af36da
CRs-Fixed: 2664097

core/mac/inc/sir_api.h

@@ -2945,6 +2945,7 @@ struct roam_offload_synch_ind {
 	struct qdf_mac_addr src_mac;
 	uint16_t hlp_data_len;
 	uint8_t hlp_data[FILS_MAX_HLP_DATA_LEN];
+	bool is_ft_im_roam;
 };
 
 #ifdef WLAN_FEATURE_ROAM_OFFLOAD

core/mac/inc/sir_mac_prot_def.h

@@ -251,7 +251,10 @@
 #define SIR_MAC_B_PR_SSID_OFFSET             12
 
 /* Association/Reassociation offsets */
-#define SIR_MAC_REASSOC_SSID_OFFSET          10
+#define SIR_MAC_REASSOC_REQ_SSID_OFFSET      10
+
+/* Association Request offsets */
+#define SIR_MAC_ASSOC_REQ_SSID_OFFSET        4
 
 /* / Transaction sequence number definitions (used in Authentication frames) */
 #define    SIR_MAC_AUTH_FRAME_1        1

core/mac/src/pe/include/lim_api.h

@@ -328,6 +328,10 @@ pe_roam_synch_callback(struct mac_context *mac_ctx,
 		       struct bss_description *bss_desc_ptr,
 		       enum sir_roam_op_code reason);
 
+void
+lim_check_ft_initial_im_association(struct roam_offload_synch_ind *roam_synch,
+				    struct pe_session *session_entry);
+
 /**
  * pe_disconnect_callback() - Callback to handle deauth event is received
  * from firmware

core/mac/src/pe/lim/lim_api.c

@@ -2457,6 +2457,35 @@ lim_fill_fils_ft(struct pe_session *src_session,
 {}
 #endif
 
+/**
+ * lim_check_ft_initial_im_association() - To check FT initial mobility(im)
+ * association
+ * @roam_synch: A pointer to roam sync ind structure
+ * @session_entry: pe session
+ *
+ * This function is to check ft_initial_im_association.
+ *
+ * Return: None
+ */
+void
+lim_check_ft_initial_im_association(struct roam_offload_synch_ind *roam_synch,
+				    struct pe_session *session_entry)
+{
+	tpSirMacMgmtHdr hdr;
+	uint8_t *assoc_req_ptr;
+
+	assoc_req_ptr = (uint8_t *) roam_synch + roam_synch->reassoc_req_offset;
+	hdr = (tpSirMacMgmtHdr) assoc_req_ptr;
+
+	if (hdr->fc.type == SIR_MAC_MGMT_FRAME &&
+	    hdr->fc.subType == SIR_MAC_MGMT_ASSOC_REQ &&
+	    session_entry->is11Rconnection) {
+		pe_debug("Frame subtype: %d and connection is %d",
+			 hdr->fc.subType, session_entry->is11Rconnection);
+		roam_synch->is_ft_im_roam = true;
+	}
+}
+
 QDF_STATUS
 pe_roam_synch_callback(struct mac_context *mac_ctx,
 		       struct roam_offload_synch_ind *roam_sync_ind_ptr,
@@ -2621,6 +2650,8 @@ pe_roam_synch_callback(struct mac_context *mac_ctx,
 	lim_process_assoc_rsp_frame(mac_ctx, mac_ctx->roam.pReassocResp,
 				    LIM_REASSOC, ft_session_ptr);
 
+	lim_check_ft_initial_im_association(roam_sync_ind_ptr, ft_session_ptr);
+
 	lim_copy_and_free_hlp_data_from_session(ft_session_ptr,
 						roam_sync_ind_ptr);
 

core/sme/src/csr/csr_api_roam.c

@@ -20776,6 +20776,7 @@ static QDF_STATUS csr_process_roam_sync_callback(struct mac_context *mac_ctx,
 	bool abort_host_scan_cap = false;
 	wlan_scan_id scan_id;
 	struct wlan_crypto_pmksa *pmksa;
+	uint8_t ssid_offset;
 
 	vdev = wlan_objmgr_get_vdev_by_id_from_psoc(mac_ctx->psoc, session_id,
 						    WLAN_LEGACY_SME_ID);
@@ -21109,9 +21110,16 @@ static QDF_STATUS csr_process_roam_sync_callback(struct mac_context *mac_ctx,
 		csr_neighbor_roam_state_transition(mac_ctx,
 				eCSR_NEIGHBOR_ROAM_STATE_INIT, session_id);
 	}
+
+	if (roam_synch_data->is_ft_im_roam) {
+		ssid_offset = SIR_MAC_ASSOC_REQ_SSID_OFFSET;
+	} else {
+		ssid_offset = SIR_MAC_REASSOC_REQ_SSID_OFFSET;
+	}
+
 	roam_info->nBeaconLength = 0;
 	roam_info->nAssocReqLength = roam_synch_data->reassoc_req_length -
-		SIR_MAC_HDR_LEN_3A - SIR_MAC_REASSOC_SSID_OFFSET;
+		SIR_MAC_HDR_LEN_3A - ssid_offset;
 	roam_info->nAssocRspLength = roam_synch_data->reassocRespLength -
 		SIR_MAC_HDR_LEN_3A;
 	roam_info->pbFrames = qdf_mem_malloc(roam_info->nBeaconLength +
@@ -21127,8 +21135,9 @@ static QDF_STATUS csr_process_roam_sync_callback(struct mac_context *mac_ctx,
 	qdf_mem_copy(roam_info->pbFrames,
 			(uint8_t *)roam_synch_data +
 			roam_synch_data->reassoc_req_offset +
-			SIR_MAC_HDR_LEN_3A + SIR_MAC_REASSOC_SSID_OFFSET,
+			SIR_MAC_HDR_LEN_3A + ssid_offset,
 			roam_info->nAssocReqLength);
+
 	qdf_mem_copy(roam_info->pbFrames + roam_info->nAssocReqLength,
 			(uint8_t *)roam_synch_data +
 			roam_synch_data->reassocRespOffset +