From effd05ac479b80641835f9126bbe93146686c2b8 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Tue, 18 Nov 2014 17:21:19 +0100 Subject: [PATCH] iwlwifi: mvm: support random MAC address for scanning For background and scheduled scan, using the new unified scan API, support random MAC address scanning. Unfortunately, the firmware right now doesn't support randomising itself, so for now do it on the host - we'll change this once the firmware supports randomising the address for each scan iteration using the address/mask. Signed-off-by: Johannes Berg Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/mac80211.c | 6 +++- drivers/net/wireless/iwlwifi/mvm/scan.c | 35 +++++++++++++++++---- 2 files changed, 34 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/iwlwifi/mvm/mac80211.c index bc5883a38f05..d37d5a8b383e 100644 --- a/drivers/net/wireless/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/iwlwifi/mvm/mac80211.c @@ -344,8 +344,12 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm) } if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LMAC_SCAN || - mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN) + mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN) { hw->flags |= IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS; + hw->wiphy->features |= + NL80211_FEATURE_SCHED_SCAN_RANDOM_MAC_ADDR | + NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR; + } hw->sta_data_size = sizeof(struct iwl_mvm_sta); hw->vif_data_size = sizeof(struct iwl_mvm_vif); diff --git a/drivers/net/wireless/iwlwifi/mvm/scan.c b/drivers/net/wireless/iwlwifi/mvm/scan.c index 219174597ff0..54303d935c57 100644 --- a/drivers/net/wireless/iwlwifi/mvm/scan.c +++ b/drivers/net/wireless/iwlwifi/mvm/scan.c @@ -1224,14 +1224,25 @@ static u8 *iwl_mvm_copy_and_insert_ds_elem(struct iwl_mvm *mvm, const u8 *ies, static void iwl_mvm_build_unified_scan_probe(struct iwl_mvm *mvm, struct ieee80211_vif *vif, struct ieee80211_scan_ies *ies, - struct iwl_scan_probe_req *preq) + struct iwl_scan_probe_req *preq, + const u8 *mac_addr, const u8 *mac_addr_mask) { struct ieee80211_mgmt *frame = (struct ieee80211_mgmt *)preq->buf; u8 *pos, *newpos; + /* + * Unfortunately, right now the offload scan doesn't support randomising + * within the firmware, so until the firmware API is ready we implement + * it in the driver. This means that the scan iterations won't really be + * random, only when it's restarted, but at least that helps a bit. + */ + if (mac_addr) + get_random_mask_addr(frame->sa, mac_addr, mac_addr_mask); + else + memcpy(frame->sa, vif->addr, ETH_ALEN); + frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); eth_broadcast_addr(frame->da); - memcpy(frame->sa, vif->addr, ETH_ALEN); eth_broadcast_addr(frame->bssid); frame->seq_ctrl = 0; @@ -1375,7 +1386,10 @@ int iwl_mvm_unified_scan_lmac(struct iwl_mvm *mvm, preq = (void *)(cmd->data + sizeof(struct iwl_scan_channel_cfg_lmac) * mvm->fw->ucode_capa.n_scan_channels); - iwl_mvm_build_unified_scan_probe(mvm, vif, &req->ies, preq); + iwl_mvm_build_unified_scan_probe(mvm, vif, &req->ies, preq, + req->req.flags & NL80211_SCAN_FLAG_RANDOM_ADDR ? + req->req.mac_addr : NULL, + req->req.mac_addr_mask); ret = iwl_mvm_send_cmd(mvm, &hcmd); if (!ret) { @@ -1466,7 +1480,10 @@ int iwl_mvm_unified_sched_scan_lmac(struct iwl_mvm *mvm, preq = (void *)(cmd->data + sizeof(struct iwl_scan_channel_cfg_lmac) * mvm->fw->ucode_capa.n_scan_channels); - iwl_mvm_build_unified_scan_probe(mvm, vif, ies, preq); + iwl_mvm_build_unified_scan_probe(mvm, vif, ies, preq, + req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR ? + req->mac_addr : NULL, + req->mac_addr_mask); ret = iwl_mvm_send_cmd(mvm, &hcmd); if (!ret) { @@ -1796,7 +1813,10 @@ int iwl_mvm_scan_umac(struct iwl_mvm *mvm, struct ieee80211_vif *vif, sec_part->schedule[0].iter_count = 1; sec_part->delay = 0; - iwl_mvm_build_unified_scan_probe(mvm, vif, &req->ies, &sec_part->preq); + iwl_mvm_build_unified_scan_probe(mvm, vif, &req->ies, &sec_part->preq, + req->req.flags & NL80211_SCAN_FLAG_RANDOM_ADDR ? + req->req.mac_addr : NULL, + req->req.mac_addr_mask); iwl_mvm_scan_fill_ssids(sec_part->direct_scan, req->req.ssids, req->req.n_ssids, 0); @@ -1901,7 +1921,10 @@ int iwl_mvm_sched_scan_umac(struct iwl_mvm *mvm, struct ieee80211_vif *vif, sec_part->delay = 0; - iwl_mvm_build_unified_scan_probe(mvm, vif, ies, &sec_part->preq); + iwl_mvm_build_unified_scan_probe(mvm, vif, ies, &sec_part->preq, + req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR ? + req->mac_addr : NULL, + req->mac_addr_mask); ret = iwl_mvm_send_cmd(mvm, &hcmd); if (!ret) { -- 2.20.1