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 u8 *p; 122 123 if (local->hw.queues < IEEE80211_NUM_ACS) 124 return 0; 125 126 if (!ieee80211_is_data(hdr->frame_control)) { 127 skb->priority = 7; 128 return ieee802_1d_to_ac[skb->priority]; 129 } 130 if (!ieee80211_is_data_qos(hdr->frame_control)) { 131 skb->priority = 0; 132 return ieee802_1d_to_ac[skb->priority]; 133 } 134 135 p = ieee80211_get_qos_ctl(hdr); 136 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; 137 138 return ieee80211_downgrade_queue(sdata, NULL, skb); 139 } 140 141 u16 __ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, 142 struct sta_info *sta, struct sk_buff *skb) 143 { 144 struct mac80211_qos_map *qos_map; 145 bool qos; 146 147 /* all mesh/ocb stations are required to support WME */ 148 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 149 sdata->vif.type == NL80211_IFTYPE_OCB) 150 qos = true; 151 else if (sta) 152 qos = sta->sta.wme; 153 else 154 qos = false; 155 156 if (!qos) { 157 skb->priority = 0; /* required for correct WPA/11i MIC */ 158 return IEEE80211_AC_BE; 159 } 160 161 if (skb->protocol == sdata->control_port_protocol) { 162 skb->priority = 7; 163 goto downgrade; 164 } 165 166 /* use the data classifier to determine what 802.1d tag the 167 * data frame has */ 168 qos_map = rcu_dereference(sdata->qos_map); 169 skb->priority = cfg80211_classify8021d(skb, qos_map ? 170 &qos_map->qos_map : NULL); 171 172 downgrade: 173 return ieee80211_downgrade_queue(sdata, sta, skb); 174 } 175 176 177 /* Indicate which queue to use. */ 178 u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, 179 struct sk_buff *skb) 180 { 181 struct ieee80211_local *local = sdata->local; 182 struct sta_info *sta = NULL; 183 const u8 *ra = NULL; 184 u16 ret; 185 186 /* when using iTXQ, we can do this later */ 187 if (local->ops->wake_tx_queue) 188 return 0; 189 190 if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) { 191 skb->priority = 0; /* required for correct WPA/11i MIC */ 192 return 0; 193 } 194 195 rcu_read_lock(); 196 switch (sdata->vif.type) { 197 case NL80211_IFTYPE_AP_VLAN: 198 sta = rcu_dereference(sdata->u.vlan.sta); 199 if (sta) 200 break; 201 fallthrough; 202 case NL80211_IFTYPE_AP: 203 ra = skb->data; 204 break; 205 case NL80211_IFTYPE_WDS: 206 ra = sdata->u.wds.remote_addr; 207 break; 208 case NL80211_IFTYPE_STATION: 209 /* might be a TDLS station */ 210 sta = sta_info_get(sdata, skb->data); 211 if (sta) 212 break; 213 214 ra = sdata->u.mgd.bssid; 215 break; 216 case NL80211_IFTYPE_ADHOC: 217 ra = skb->data; 218 break; 219 default: 220 break; 221 } 222 223 if (!sta && ra && !is_multicast_ether_addr(ra)) 224 sta = sta_info_get(sdata, ra); 225 226 ret = __ieee80211_select_queue(sdata, sta, skb); 227 228 rcu_read_unlock(); 229 return ret; 230 } 231 232 /** 233 * ieee80211_set_qos_hdr - Fill in the QoS header if there is one. 234 * 235 * @sdata: local subif 236 * @skb: packet to be updated 237 */ 238 void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata, 239 struct sk_buff *skb) 240 { 241 struct ieee80211_hdr *hdr = (void *)skb->data; 242 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 243 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 244 u8 flags; 245 u8 *p; 246 247 if (!ieee80211_is_data_qos(hdr->frame_control)) 248 return; 249 250 p = ieee80211_get_qos_ctl(hdr); 251 252 /* set up the first byte */ 253 254 /* 255 * preserve everything but the TID and ACK policy 256 * (which we both write here) 257 */ 258 flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK | 259 IEEE80211_QOS_CTL_ACK_POLICY_MASK); 260 261 if (is_multicast_ether_addr(hdr->addr1) || 262 sdata->noack_map & BIT(tid)) { 263 flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK; 264 info->flags |= IEEE80211_TX_CTL_NO_ACK; 265 } 266 267 *p = flags | tid; 268 269 /* set up the second byte */ 270 p++; 271 272 if (ieee80211_vif_is_mesh(&sdata->vif)) { 273 /* preserve RSPI and Mesh PS Level bit */ 274 *p &= ((IEEE80211_QOS_CTL_RSPI | 275 IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8); 276 277 /* Nulls don't have a mesh header (frame body) */ 278 if (!ieee80211_is_qos_nullfunc(hdr->frame_control)) 279 *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8); 280 } else { 281 *p = 0; 282 } 283 } 284