net/mac80211/s1g.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * S1G handling
   4  * Copyright(c) 2020 Adapt-IP
   5  */
   6 #include <linux/ieee80211.h>
   7 #include <net/mac80211.h>
   8 #include "ieee80211_i.h"
   9 #include "driver-ops.h"
  10
  11 void ieee80211_s1g_sta_rate_init(struct sta_info *sta)
  12 {
  13         /* avoid indicating legacy bitrates for S1G STAs */
  14         sta->deflink.tx_stats.last_rate.flags |= IEEE80211_TX_RC_S1G_MCS;
  15         sta->deflink.rx_stats.last_rate =
  16                         STA_STATS_FIELD(TYPE, STA_STATS_RATE_TYPE_S1G);
  17 }
  18
  19 bool ieee80211_s1g_is_twt_setup(struct sk_buff *skb)
  20 {
  21         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
  22
  23         if (likely(!ieee80211_is_action(mgmt->frame_control)))
  24                 return false;
  25
  26         if (likely(mgmt->u.action.category != WLAN_CATEGORY_S1G))
  27                 return false;
  28
  29         return mgmt->u.action.u.s1g.action_code == WLAN_S1G_TWT_SETUP;
  30 }
  31
  32 static void
  33 ieee80211_s1g_send_twt_setup(struct ieee80211_sub_if_data *sdata, const u8 *da,
  34                              const u8 *bssid, struct ieee80211_twt_setup *twt)
  35 {
  36         int len = IEEE80211_MIN_ACTION_SIZE + 4 + twt->length;
  37         struct ieee80211_local *local = sdata->local;
  38         struct ieee80211_mgmt *mgmt;
  39         struct sk_buff *skb;
  40
  41         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
  42         if (!skb)
  43                 return;
  44
  45         skb_reserve(skb, local->hw.extra_tx_headroom);
  46         mgmt = skb_put_zero(skb, len);
  47         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  48                                           IEEE80211_STYPE_ACTION);
  49         memcpy(mgmt->da, da, ETH_ALEN);
  50         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  51         memcpy(mgmt->bssid, bssid, ETH_ALEN);
  52
  53         mgmt->u.action.category = WLAN_CATEGORY_S1G;
  54         mgmt->u.action.u.s1g.action_code = WLAN_S1G_TWT_SETUP;
  55         memcpy(mgmt->u.action.u.s1g.variable, twt, 3 + twt->length);
  56
  57         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
  58                                         IEEE80211_TX_INTFL_MLME_CONN_TX |
  59                                         IEEE80211_TX_CTL_REQ_TX_STATUS;
  60         ieee80211_tx_skb(sdata, skb);
  61 }
  62
  63 static void
  64 ieee80211_s1g_send_twt_teardown(struct ieee80211_sub_if_data *sdata,
  65                                 const u8 *da, const u8 *bssid, u8 flowid)
  66 {
  67         struct ieee80211_local *local = sdata->local;
  68         struct ieee80211_mgmt *mgmt;
  69         struct sk_buff *skb;
  70         u8 *id;
  71
  72         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
  73                             IEEE80211_MIN_ACTION_SIZE + 2);
  74         if (!skb)
  75                 return;
  76
  77         skb_reserve(skb, local->hw.extra_tx_headroom);
  78         mgmt = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE + 2);
  79         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  80                                           IEEE80211_STYPE_ACTION);
  81         memcpy(mgmt->da, da, ETH_ALEN);
  82         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  83         memcpy(mgmt->bssid, bssid, ETH_ALEN);
  84
  85         mgmt->u.action.category = WLAN_CATEGORY_S1G;
  86         mgmt->u.action.u.s1g.action_code = WLAN_S1G_TWT_TEARDOWN;
  87         id = (u8 *)mgmt->u.action.u.s1g.variable;
  88         *id = flowid;
  89
  90         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
  91                                         IEEE80211_TX_CTL_REQ_TX_STATUS;
  92         ieee80211_tx_skb(sdata, skb);
  93 }
  94
  95 static void
  96 ieee80211_s1g_rx_twt_setup(struct ieee80211_sub_if_data *sdata,
  97                            struct sta_info *sta, struct sk_buff *skb)
  98 {
  99         struct ieee80211_mgmt *mgmt = (void *)skb->data;
 100         struct ieee80211_twt_setup *twt = (void *)mgmt->u.action.u.s1g.variable;
 101         struct ieee80211_twt_params *twt_agrt = (void *)twt->params;
 102
 103         twt_agrt->req_type &= cpu_to_le16(~IEEE80211_TWT_REQTYPE_REQUEST);
 104
 105         /* broadcast TWT not supported yet */
 106         if (twt->control & IEEE80211_TWT_CONTROL_NEG_TYPE_BROADCAST) {
 107                 twt_agrt->req_type &=
 108                         ~cpu_to_le16(IEEE80211_TWT_REQTYPE_SETUP_CMD);
 109                 twt_agrt->req_type |=
 110                         le16_encode_bits(TWT_SETUP_CMD_REJECT,
 111                                          IEEE80211_TWT_REQTYPE_SETUP_CMD);
 112                 goto out;
 113         }
 114
 115         drv_add_twt_setup(sdata->local, sdata, &sta->sta, twt);
 116 out:
 117         ieee80211_s1g_send_twt_setup(sdata, mgmt->sa, sdata->vif.addr, twt);
 118 }
 119
 120 static void
 121 ieee80211_s1g_rx_twt_teardown(struct ieee80211_sub_if_data *sdata,
 122                               struct sta_info *sta, struct sk_buff *skb)
 123 {
 124         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
 125
 126         drv_twt_teardown_request(sdata->local, sdata, &sta->sta,
 127                                  mgmt->u.action.u.s1g.variable[0]);
 128 }
 129
 130 static void
 131 ieee80211_s1g_tx_twt_setup_fail(struct ieee80211_sub_if_data *sdata,
 132                                 struct sta_info *sta, struct sk_buff *skb)
 133 {
 134         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
 135         struct ieee80211_twt_setup *twt = (void *)mgmt->u.action.u.s1g.variable;
 136         struct ieee80211_twt_params *twt_agrt = (void *)twt->params;
 137         u8 flowid = le16_get_bits(twt_agrt->req_type,
 138                                   IEEE80211_TWT_REQTYPE_FLOWID);
 139
 140         drv_twt_teardown_request(sdata->local, sdata, &sta->sta, flowid);
 141
 142         ieee80211_s1g_send_twt_teardown(sdata, mgmt->sa, sdata->vif.addr,
 143                                         flowid);
 144 }
 145
 146 void ieee80211_s1g_rx_twt_action(struct ieee80211_sub_if_data *sdata,
 147                                  struct sk_buff *skb)
 148 {
 149         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
 150         struct ieee80211_local *local = sdata->local;
 151         struct sta_info *sta;
 152
 153         mutex_lock(&local->sta_mtx);
 154
 155         sta = sta_info_get_bss(sdata, mgmt->sa);
 156         if (!sta)
 157                 goto out;
 158
 159         switch (mgmt->u.action.u.s1g.action_code) {
 160         case WLAN_S1G_TWT_SETUP:
 161                 ieee80211_s1g_rx_twt_setup(sdata, sta, skb);
 162                 break;
 163         case WLAN_S1G_TWT_TEARDOWN:
 164                 ieee80211_s1g_rx_twt_teardown(sdata, sta, skb);
 165                 break;
 166         default:
 167                 break;
 168         }
 169
 170 out:
 171         mutex_unlock(&local->sta_mtx);
 172 }
 173
 174 void ieee80211_s1g_status_twt_action(struct ieee80211_sub_if_data *sdata,
 175                                      struct sk_buff *skb)
 176 {
 177         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
 178         struct ieee80211_local *local = sdata->local;
 179         struct sta_info *sta;
 180
 181         mutex_lock(&local->sta_mtx);
 182
 183         sta = sta_info_get_bss(sdata, mgmt->da);
 184         if (!sta)
 185                 goto out;
 186
 187         switch (mgmt->u.action.u.s1g.action_code) {
 188         case WLAN_S1G_TWT_SETUP:
 189                 /* process failed twt setup frames */
 190                 ieee80211_s1g_tx_twt_setup_fail(sdata, sta, skb);
 191                 break;
 192         default:
 193                 break;
 194         }
 195
 196 out:
 197         mutex_unlock(&local->sta_mtx);
 198 }