1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2004, Instant802 Networks, Inc. 4 * Copyright 2013-2014 Intel Mobile Communications GmbH 5 */ 6 7 #include <linux/netdevice.h> 8 #include <linux/skbuff.h> 9 #include <linux/module.h> 10 #include <linux/if_arp.h> 11 #include <linux/types.h> 12 #include <net/ip.h> 13 #include <net/pkt_sched.h> 14 15 #include <net/mac80211.h> 16 #include "ieee80211_i.h" 17 #include "wme.h" 18 19 /* Default mapping in classifier to work with default 20 * queue setup. 21 */ 22 const int ieee802_1d_to_ac[8] = { 23 IEEE80211_AC_BE, 24 IEEE80211_AC_BK, 25 IEEE80211_AC_BK, 26 IEEE80211_AC_BE, 27 IEEE80211_AC_VI, 28 IEEE80211_AC_VI, 29 IEEE80211_AC_VO, 30 IEEE80211_AC_VO 31 }; 32 33 static int wme_downgrade_ac(struct sk_buff *skb) 34 { 35 switch (skb->priority) { 36 case 6: 37 case 7: 38 skb->priority = 5; /* VO -> VI */ 39 return 0; 40 case 4: 41 case 5: 42 skb->priority = 3; /* VI -> BE */ 43 return 0; 44 case 0: 45 case 3: 46 skb->priority = 2; /* BE -> BK */ 47 return 0; 48 default: 49 return -1; 50 } 51 } 52 53 /** 54 * ieee80211_fix_reserved_tid - return the TID to use if this one is reserved 55 * @tid: the assumed-reserved TID 56 * 57 * Returns: the alternative TID to use, or 0 on error 58 */ 59 static inline u8 ieee80211_fix_reserved_tid(u8 tid) 60 { 61 switch (tid) { 62 case 0: 63 return 3; 64 case 1: 65 return 2; 66 case 2: 67 return 1; 68 case 3: 69 return 0; 70 case 4: 71 return 5; 72 case 5: 73 return 4; 74 case 6: 75 return 7; 76 case 7: 77 return 6; 78 } 79 80 return 0; 81 } 82 83 static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata, 84 struct sta_info *sta, struct sk_buff *skb) 85 { 86 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 87 88 /* in case we are a client verify acm is not set for this ac */ 89 while (sdata->wmm_acm & BIT(skb->priority)) { 90 int ac = ieee802_1d_to_ac[skb->priority]; 91 92 if (ifmgd->tx_tspec[ac].admitted_time && 93 skb->priority == ifmgd->tx_tspec[ac].up) 94 return ac; 95 96 if (wme_downgrade_ac(skb)) { 97 /* 98 * This should not really happen. The AP has marked all 99 * lower ACs to require admission control which is not 100 * a reasonable configuration. Allow the frame to be 101 * transmitted using AC_BK as a workaround. 102 */ 103 break; 104 } 105 } 106 107 /* Check to see if this is a reserved TID */ 108 if (sta && sta->reserved_tid == skb->priority) 109 skb->priority = ieee80211_fix_reserved_tid(skb->priority); 110 111 /* look up which queue to use for frames with this 1d tag */ 112 return ieee802_1d_to_ac[skb->priority]; 113 } 114 115 /* Indicate which queue to use for this fully formed 802.11 frame */ 116 u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata, 117 struct sk_buff *skb, 118 struct ieee80211_hdr *hdr) 119 { 120 struct ieee80211_local *local = sdata->local; 121 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 122 u8 *p; 123 124 if ((info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) || 125 local->hw.queues < IEEE80211_NUM_ACS) 126 return 0; 127 128 if (!ieee80211_is_data(hdr->frame_control)) { 129 skb->priority = 7; 130 return ieee802_1d_to_ac[skb->priority]; 131 } 132 if (!ieee80211_is_data_qos(hdr->frame_control)) { 133 skb->priority = 0; 134 return ieee802_1d_to_ac[skb->priority]; 135 } 136 137 p = ieee80211_get_qos_ctl(hdr); 138 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; 139 140 return ieee80211_downgrade_queue(sdata, NULL, skb); 141 } 142 143 u16 __ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, 144 struct sta_info *sta, struct sk_buff *skb) 145 { 146 struct mac80211_qos_map *qos_map; 147 bool qos; 148 149 /* all mesh/ocb stations are required to support WME */ 150 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 151 sdata->vif.type == NL80211_IFTYPE_OCB) 152 qos = true; 153 else if (sta) 154 qos = sta->sta.wme; 155 else 156 qos = false; 157 158 if (!qos) { 159 skb->priority = 0; /* required for correct WPA/11i MIC */ 160 return IEEE80211_AC_BE; 161 } 162 163 if (skb->protocol == sdata->control_port_protocol) { 164 skb->priority = 7; 165 goto downgrade; 166 } 167 168 /* use the data classifier to determine what 802.1d tag the 169 * data frame has */ 170 qos_map = rcu_dereference(sdata->qos_map); 171 skb->priority = cfg80211_classify8021d(skb, qos_map ? 172 &qos_map->qos_map : NULL); 173 174 downgrade: 175 return ieee80211_downgrade_queue(sdata, sta, skb); 176 } 177 178 179 /* Indicate which queue to use. */ 180 u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, 181 struct sk_buff *skb) 182 { 183 struct ieee80211_local *local = sdata->local; 184 struct sta_info *sta = NULL; 185 const u8 *ra = NULL; 186 u16 ret; 187 188 /* when using iTXQ, we can do this later */ 189 if (local->ops->wake_tx_queue) 190 return 0; 191 192 if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) { 193 skb->priority = 0; /* required for correct WPA/11i MIC */ 194 return 0; 195 } 196 197 rcu_read_lock(); 198 switch (sdata->vif.type) { 199 case NL80211_IFTYPE_AP_VLAN: 200 sta = rcu_dereference(sdata->u.vlan.sta); 201 if (sta) 202 break; 203 fallthrough; 204 case NL80211_IFTYPE_AP: 205 ra = skb->data; 206 break; 207 case NL80211_IFTYPE_STATION: 208 /* might be a TDLS station */ 209 sta = sta_info_get(sdata, skb->data); 210 if (sta) 211 break; 212 213 ra = sdata->u.mgd.bssid; 214 break; 215 case NL80211_IFTYPE_ADHOC: 216 ra = skb->data; 217 break; 218 default: 219 break; 220 } 221 222 if (!sta && ra && !is_multicast_ether_addr(ra)) 223 sta = sta_info_get(sdata, ra); 224 225 ret = __ieee80211_select_queue(sdata, sta, skb); 226 227 rcu_read_unlock(); 228 return ret; 229 } 230 231 /** 232 * ieee80211_set_qos_hdr - Fill in the QoS header if there is one. 233 * 234 * @sdata: local subif 235 * @skb: packet to be updated 236 */ 237 void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata, 238 struct sk_buff *skb) 239 { 240 struct ieee80211_hdr *hdr = (void *)skb->data; 241 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 242 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 243 u8 flags; 244 u8 *p; 245 246 if (!ieee80211_is_data_qos(hdr->frame_control)) 247 return; 248 249 p = ieee80211_get_qos_ctl(hdr); 250 251 /* don't overwrite the QoS field of injected frames */ 252 if (info->flags & IEEE80211_TX_CTL_INJECTED) { 253 /* do take into account Ack policy of injected frames */ 254 if (*p & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 255 info->flags |= IEEE80211_TX_CTL_NO_ACK; 256 return; 257 } 258 259 /* set up the first byte */ 260 261 /* 262 * preserve everything but the TID and ACK policy 263 * (which we both write here) 264 */ 265 flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK | 266 IEEE80211_QOS_CTL_ACK_POLICY_MASK); 267 268 if (is_multicast_ether_addr(hdr->addr1) || 269 sdata->noack_map & BIT(tid)) { 270 flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK; 271 info->flags |= IEEE80211_TX_CTL_NO_ACK; 272 } 273 274 *p = flags | tid; 275 276 /* set up the second byte */ 277 p++; 278 279 if (ieee80211_vif_is_mesh(&sdata->vif)) { 280 /* preserve RSPI and Mesh PS Level bit */ 281 *p &= ((IEEE80211_QOS_CTL_RSPI | 282 IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8); 283 284 /* Nulls don't have a mesh header (frame body) */ 285 if (!ieee80211_is_qos_nullfunc(hdr->frame_control)) 286 *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8); 287 } else { 288 *p = 0; 289 } 290 } 291