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ath11k: support GTK rekey offload
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Host sets GTK related info to firmware before WoW is enabled, and
gets rekey replay_count and then disables GTK rekey when WoW quits.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1

Signed-off-by: Carl Huang <quic_cjhuang@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/1644308006-22784-7-git-send-email-quic_cjhuang@quicinc.com
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@ygblue @kvalo
ygblue authored and kvalo committed Mar 18, 2022
1 parent c3c36bf commit a16d9b5
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Showing 5 changed files with 258 additions and 1 deletion.
8 changes: 8 additions & 0 deletions drivers/net/wireless/ath/ath11k/core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -230,6 +230,13 @@ struct ath11k_arp_ns_offload {
u8 mac_addr[ETH_ALEN];
};

struct ath11k_rekey_data {
u8 kck[NL80211_KCK_LEN];
u8 kek[NL80211_KCK_LEN];
u64 replay_ctr;
bool enable_offload;
};

struct ath11k_vif {
u32 vdev_id;
enum wmi_vdev_type vdev_type;
Expand Down Expand Up @@ -282,6 +289,7 @@ struct ath11k_vif {
bool do_not_send_tmpl;
struct ieee80211_chanctx_conf chanctx;
struct ath11k_arp_ns_offload arp_ns_offload;
struct ath11k_rekey_data rekey_data;

#ifdef CONFIG_ATH11K_DEBUGFS
struct dentry *debugfs_twt;
Expand Down
37 changes: 37 additions & 0 deletions drivers/net/wireless/ath/ath11k/mac.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2757,6 +2757,7 @@ static void ath11k_bss_assoc(struct ieee80211_hw *hw,
}

arvif->is_up = true;
arvif->rekey_data.enable_offload = false;

ath11k_dbg(ar->ab, ATH11K_DBG_MAC,
"mac vdev %d up (associated) bssid %pM aid %d\n",
Expand Down Expand Up @@ -2814,6 +2815,8 @@ static void ath11k_bss_disassoc(struct ieee80211_hw *hw,

arvif->is_up = false;

memset(&arvif->rekey_data, 0, sizeof(arvif->rekey_data));

cancel_delayed_work_sync(&arvif->connection_loss_work);
}

Expand Down Expand Up @@ -8200,6 +8203,39 @@ static void ath11k_mac_op_ipv6_changed(struct ieee80211_hw *hw,
ath11k_generate_ns_mc_addr(ar, offload);
}

static void ath11k_mac_op_set_rekey_data(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct cfg80211_gtk_rekey_data *data)
{
struct ath11k *ar = hw->priv;
struct ath11k_vif *arvif = ath11k_vif_to_arvif(vif);
struct ath11k_rekey_data *rekey_data = &arvif->rekey_data;

ath11k_dbg(ar->ab, ATH11K_DBG_MAC, "mac set rekey data vdev %d\n",
arvif->vdev_id);

mutex_lock(&ar->conf_mutex);

memcpy(rekey_data->kck, data->kck, NL80211_KCK_LEN);
memcpy(rekey_data->kek, data->kek, NL80211_KEK_LEN);

/* The supplicant works on big-endian, the firmware expects it on
* little endian.
*/
rekey_data->replay_ctr = get_unaligned_be64(data->replay_ctr);

arvif->rekey_data.enable_offload = true;

ath11k_dbg_dump(ar->ab, ATH11K_DBG_MAC, "kck", NULL,
rekey_data->kck, NL80211_KCK_LEN);
ath11k_dbg_dump(ar->ab, ATH11K_DBG_MAC, "kek", NULL,
rekey_data->kck, NL80211_KEK_LEN);
ath11k_dbg_dump(ar->ab, ATH11K_DBG_MAC, "replay ctr", NULL,
&rekey_data->replay_ctr, sizeof(rekey_data->replay_ctr));

mutex_unlock(&ar->conf_mutex);
}

static const struct ieee80211_ops ath11k_ops = {
.tx = ath11k_mac_op_tx,
.start = ath11k_mac_op_start,
Expand All @@ -8214,6 +8250,7 @@ static const struct ieee80211_ops ath11k_ops = {
.hw_scan = ath11k_mac_op_hw_scan,
.cancel_hw_scan = ath11k_mac_op_cancel_hw_scan,
.set_key = ath11k_mac_op_set_key,
.set_rekey_data = ath11k_mac_op_set_rekey_data,
.sta_state = ath11k_mac_op_sta_state,
.sta_set_4addr = ath11k_mac_op_sta_set_4addr,
.sta_set_txpwr = ath11k_mac_op_sta_set_txpwr,
Expand Down
119 changes: 119 additions & 0 deletions drivers/net/wireless/ath/ath11k/wmi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7765,6 +7765,56 @@ static void ath11k_wmi_twt_add_dialog_event(struct ath11k_base *ab,
kfree(tb);
}

static void ath11k_wmi_gtk_offload_status_event(struct ath11k_base *ab,
struct sk_buff *skb)
{
const void **tb;
const struct wmi_gtk_offload_status_event *ev;
struct ath11k_vif *arvif;
__be64 replay_ctr_be;
u64 replay_ctr;
int ret;

tb = ath11k_wmi_tlv_parse_alloc(ab, skb->data, skb->len, GFP_ATOMIC);
if (IS_ERR(tb)) {
ret = PTR_ERR(tb);
ath11k_warn(ab, "failed to parse tlv: %d\n", ret);
return;
}

ev = tb[WMI_TAG_GTK_OFFLOAD_STATUS_EVENT];
if (!ev) {
ath11k_warn(ab, "failed to fetch gtk offload status ev");
kfree(tb);
return;
}

arvif = ath11k_mac_get_arvif_by_vdev_id(ab, ev->vdev_id);
if (!arvif) {
ath11k_warn(ab, "failed to get arvif for vdev_id:%d\n",
ev->vdev_id);
kfree(tb);
return;
}

ath11k_dbg(ab, ATH11K_DBG_WMI, "wmi gtk offload event refresh_cnt %d\n",
ev->refresh_cnt);
ath11k_dbg_dump(ab, ATH11K_DBG_WMI, "replay_cnt",
NULL, ev->replay_ctr.counter, GTK_REPLAY_COUNTER_BYTES);

replay_ctr = ev->replay_ctr.word1;
replay_ctr = (replay_ctr << 32) | ev->replay_ctr.word0;
arvif->rekey_data.replay_ctr = replay_ctr;

/* supplicant expects big-endian replay counter */
replay_ctr_be = cpu_to_be64(replay_ctr);

ieee80211_gtk_rekey_notify(arvif->vif, arvif->bssid,
(void *)&replay_ctr_be, GFP_KERNEL);

kfree(tb);
}

static void ath11k_wmi_tlv_op_rx(struct ath11k_base *ab, struct sk_buff *skb)
{
struct wmi_cmd_hdr *cmd_hdr;
Expand Down Expand Up @@ -7896,6 +7946,9 @@ static void ath11k_wmi_tlv_op_rx(struct ath11k_base *ab, struct sk_buff *skb)
case WMI_DIAG_EVENTID:
ath11k_wmi_diag_event(ab, skb);
break;
case WMI_GTK_OFFLOAD_STATUS_EVENTID:
ath11k_wmi_gtk_offload_status_event(ab, skb);
break;
/* TODO: Add remaining events */
default:
ath11k_dbg(ab, ATH11K_DBG_WMI, "Unknown eventid: 0x%x\n", id);
Expand Down Expand Up @@ -8735,3 +8788,69 @@ int ath11k_wmi_arp_ns_offload(struct ath11k *ar,

return ath11k_wmi_cmd_send(ar->wmi, skb, WMI_SET_ARP_NS_OFFLOAD_CMDID);
}

int ath11k_wmi_gtk_rekey_offload(struct ath11k *ar,
struct ath11k_vif *arvif, bool enable)
{
struct wmi_gtk_rekey_offload_cmd *cmd;
struct ath11k_rekey_data *rekey_data = &arvif->rekey_data;
int len;
struct sk_buff *skb;
__le64 replay_ctr;

len = sizeof(*cmd);
skb = ath11k_wmi_alloc_skb(ar->wmi->wmi_ab, len);
if (!skb)
return -ENOMEM;

cmd = (struct wmi_gtk_rekey_offload_cmd *)skb->data;
cmd->tlv_header = FIELD_PREP(WMI_TLV_TAG, WMI_TAG_GTK_OFFLOAD_CMD) |
FIELD_PREP(WMI_TLV_LEN, sizeof(*cmd) - TLV_HDR_SIZE);

cmd->vdev_id = arvif->vdev_id;

if (enable) {
cmd->flags = GTK_OFFLOAD_ENABLE_OPCODE;

/* the length in rekey_data and cmd is equal */
memcpy(cmd->kck, rekey_data->kck, sizeof(cmd->kck));
ath11k_ce_byte_swap(cmd->kck, GTK_OFFLOAD_KEK_BYTES);
memcpy(cmd->kek, rekey_data->kek, sizeof(cmd->kek));
ath11k_ce_byte_swap(cmd->kek, GTK_OFFLOAD_KEK_BYTES);

replay_ctr = cpu_to_le64(rekey_data->replay_ctr);
memcpy(cmd->replay_ctr, &replay_ctr,
sizeof(replay_ctr));
ath11k_ce_byte_swap(cmd->replay_ctr, GTK_REPLAY_COUNTER_BYTES);
} else {
cmd->flags = GTK_OFFLOAD_DISABLE_OPCODE;
}

ath11k_dbg(ar->ab, ATH11K_DBG_WMI, "offload gtk rekey vdev: %d %d\n",
arvif->vdev_id, enable);
return ath11k_wmi_cmd_send(ar->wmi, skb, WMI_GTK_OFFLOAD_CMDID);
}

int ath11k_wmi_gtk_rekey_getinfo(struct ath11k *ar,
struct ath11k_vif *arvif)
{
struct wmi_gtk_rekey_offload_cmd *cmd;
int len;
struct sk_buff *skb;

len = sizeof(*cmd);
skb = ath11k_wmi_alloc_skb(ar->wmi->wmi_ab, len);
if (!skb)
return -ENOMEM;

cmd = (struct wmi_gtk_rekey_offload_cmd *)skb->data;
cmd->tlv_header = FIELD_PREP(WMI_TLV_TAG, WMI_TAG_GTK_OFFLOAD_CMD) |
FIELD_PREP(WMI_TLV_LEN, sizeof(*cmd) - TLV_HDR_SIZE);

cmd->vdev_id = arvif->vdev_id;
cmd->flags = GTK_OFFLOAD_REQUEST_STATUS_OPCODE;

ath11k_dbg(ar->ab, ATH11K_DBG_WMI, "get gtk rekey vdev_id: %d\n",
arvif->vdev_id);
return ath11k_wmi_cmd_send(ar->wmi, skb, WMI_GTK_OFFLOAD_CMDID);
}
49 changes: 49 additions & 0 deletions drivers/net/wireless/ath/ath11k/wmi.h
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Original file line number Diff line number Diff line change
Expand Up @@ -5840,6 +5840,51 @@ struct wmi_set_arp_ns_offload_cmd {
*/
} __packed;

#define GTK_OFFLOAD_OPCODE_MASK 0xFF000000
#define GTK_OFFLOAD_ENABLE_OPCODE 0x01000000
#define GTK_OFFLOAD_DISABLE_OPCODE 0x02000000
#define GTK_OFFLOAD_REQUEST_STATUS_OPCODE 0x04000000

#define GTK_OFFLOAD_KEK_BYTES 16
#define GTK_OFFLOAD_KCK_BYTES 16
#define GTK_REPLAY_COUNTER_BYTES 8
#define WMI_MAX_KEY_LEN 32
#define IGTK_PN_SIZE 6

struct wmi_replayc_cnt {
union {
u8 counter[GTK_REPLAY_COUNTER_BYTES];
struct {
u32 word0;
u32 word1;
} __packed;
} __packed;
} __packed;

struct wmi_gtk_offload_status_event {
u32 vdev_id;
u32 flags;
u32 refresh_cnt;
struct wmi_replayc_cnt replay_ctr;
u8 igtk_key_index;
u8 igtk_key_length;
u8 igtk_key_rsc[IGTK_PN_SIZE];
u8 igtk_key[WMI_MAX_KEY_LEN];
u8 gtk_key_index;
u8 gtk_key_length;
u8 gtk_key_rsc[GTK_REPLAY_COUNTER_BYTES];
u8 gtk_key[WMI_MAX_KEY_LEN];
} __packed;

struct wmi_gtk_rekey_offload_cmd {
u32 tlv_header;
u32 vdev_id;
u32 flags;
u8 kek[GTK_OFFLOAD_KEK_BYTES];
u8 kck[GTK_OFFLOAD_KCK_BYTES];
u8 replay_ctr[GTK_REPLAY_COUNTER_BYTES];
} __packed;

int ath11k_wmi_cmd_send(struct ath11k_pdev_wmi *wmi, struct sk_buff *skb,
u32 cmd_id);
struct sk_buff *ath11k_wmi_alloc_skb(struct ath11k_wmi_base *wmi_sc, u32 len);
Expand Down Expand Up @@ -6014,5 +6059,9 @@ int ath11k_wmi_hw_data_filter_cmd(struct ath11k *ar, u32 vdev_id,
u32 filter_bitmap, bool enable);
int ath11k_wmi_arp_ns_offload(struct ath11k *ar,
struct ath11k_vif *arvif, bool enable);
int ath11k_wmi_gtk_rekey_offload(struct ath11k *ar,
struct ath11k_vif *arvif, bool enable);
int ath11k_wmi_gtk_rekey_getinfo(struct ath11k *ar,
struct ath11k_vif *arvif);

#endif
46 changes: 45 additions & 1 deletion drivers/net/wireless/ath/ath11k/wow.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,9 @@

static const struct wiphy_wowlan_support ath11k_wowlan_support = {
.flags = WIPHY_WOWLAN_DISCONNECT |
WIPHY_WOWLAN_MAGIC_PKT,
WIPHY_WOWLAN_MAGIC_PKT |
WIPHY_WOWLAN_SUPPORTS_GTK_REKEY |
WIPHY_WOWLAN_GTK_REKEY_FAILURE,
.pattern_min_len = WOW_MIN_PATTERN_SIZE,
.pattern_max_len = WOW_MAX_PATTERN_SIZE,
.max_pkt_offset = WOW_MAX_PKT_OFFSET,
Expand Down Expand Up @@ -582,6 +584,41 @@ static int ath11k_wow_arp_ns_offload(struct ath11k *ar, bool enable)
return 0;
}

static int ath11k_gtk_rekey_offload(struct ath11k *ar, bool enable)
{
struct ath11k_vif *arvif;
int ret;

lockdep_assert_held(&ar->conf_mutex);

list_for_each_entry(arvif, &ar->arvifs, list) {
if (arvif->vdev_type != WMI_VDEV_TYPE_STA ||
!arvif->is_up ||
!arvif->rekey_data.enable_offload)
continue;

/* get rekey info before disable rekey offload */
if (!enable) {
ret = ath11k_wmi_gtk_rekey_getinfo(ar, arvif);
if (ret) {
ath11k_warn(ar->ab, "failed to request rekey info vdev %i, ret %d\n",
arvif->vdev_id, ret);
return ret;
}
}

ret = ath11k_wmi_gtk_rekey_offload(ar, arvif, enable);

if (ret) {
ath11k_warn(ar->ab, "failed to offload gtk reky vdev %i: enable %d, ret %d\n",
arvif->vdev_id, enable, ret);
return ret;
}
}

return 0;
}

static int ath11k_wow_protocol_offload(struct ath11k *ar, bool enable)
{
int ret;
Expand All @@ -593,6 +630,13 @@ static int ath11k_wow_protocol_offload(struct ath11k *ar, bool enable)
return ret;
}

ret = ath11k_gtk_rekey_offload(ar, enable);
if (ret) {
ath11k_warn(ar->ab, "failed to offload gtk rekey %d %d\n",
enable, ret);
return ret;
}

return 0;
}

Expand Down

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