1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2004, Instant802 Networks, Inc. 4 * Copyright 2013-2014 Intel Mobile Communications GmbH 5 * Copyright (C) 2022 Intel Corporation 6 */ 7 8 #include <linux/netdevice.h> 9 #include <linux/skbuff.h> 10 #include <linux/module.h> 11 #include <linux/if_arp.h> 12 #include <linux/types.h> 13 #include <net/ip.h> 14 #include <net/pkt_sched.h> 15 16 #include <net/mac80211.h> 17 #include "ieee80211_i.h" 18 #include "wme.h" 19 20 /* Default mapping in classifier to work with default 21 * queue setup. 22 */ 23 const int ieee802_1d_to_ac[8] = { 24 IEEE80211_AC_BE, 25 IEEE80211_AC_BK, 26 IEEE80211_AC_BK, 27 IEEE80211_AC_BE, 28 IEEE80211_AC_VI, 29 IEEE80211_AC_VI, 30 IEEE80211_AC_VO, 31 IEEE80211_AC_VO 32 }; 33 34 static int wme_downgrade_ac(struct sk_buff *skb) 35 { 36 switch (skb->priority) { 37 case 6: 38 case 7: 39 skb->priority = 5; /* VO -> VI */ 40 return 0; 41 case 4: 42 case 5: 43 skb->priority = 3; /* VI -> BE */ 44 return 0; 45 case 0: 46 case 3: 47 skb->priority = 2; /* BE -> BK */ 48 return 0; 49 default: 50 return -1; 51 } 52 } 53 54 /** 55 * ieee80211_fix_reserved_tid - return the TID to use if this one is reserved 56 * @tid: the assumed-reserved TID 57 * 58 * Returns: the alternative TID to use, or 0 on error 59 */ 60 static inline u8 ieee80211_fix_reserved_tid(u8 tid) 61 { 62 switch (tid) { 63 case 0: 64 return 3; 65 case 1: 66 return 2; 67 case 2: 68 return 1; 69 case 3: 70 return 0; 71 case 4: 72 return 5; 73 case 5: 74 return 4; 75 case 6: 76 return 7; 77 case 7: 78 return 6; 79 } 80 81 return 0; 82 } 83 84 static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata, 85 struct sta_info *sta, struct sk_buff *skb) 86 { 87 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 88 89 /* in case we are a client verify acm is not set for this ac */ 90 while (sdata->wmm_acm & BIT(skb->priority)) { 91 int ac = ieee802_1d_to_ac[skb->priority]; 92 93 if (ifmgd->tx_tspec[ac].admitted_time && 94 skb->priority == ifmgd->tx_tspec[ac].up) 95 return ac; 96 97 if (wme_downgrade_ac(skb)) { 98 /* 99 * This should not really happen. The AP has marked all 100 * lower ACs to require admission control which is not 101 * a reasonable configuration. Allow the frame to be 102 * transmitted using AC_BK as a workaround. 103 */ 104 break; 105 } 106 } 107 108 /* Check to see if this is a reserved TID */ 109 if (sta && sta->reserved_tid == skb->priority) 110 skb->priority = ieee80211_fix_reserved_tid(skb->priority); 111 112 /* look up which queue to use for frames with this 1d tag */ 113 return ieee802_1d_to_ac[skb->priority]; 114 } 115 116 /* Indicate which queue to use for this fully formed 802.11 frame */ 117 u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata, 118 struct sk_buff *skb, 119 struct ieee80211_hdr *hdr) 120 { 121 struct ieee80211_local *local = sdata->local; 122 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 123 u8 *p; 124 125 /* Ensure hash is set prior to potential SW encryption */ 126 skb_get_hash(skb); 127 128 if ((info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) || 129 local->hw.queues < IEEE80211_NUM_ACS) 130 return 0; 131 132 if (!ieee80211_is_data(hdr->frame_control)) { 133 skb->priority = 7; 134 return ieee802_1d_to_ac[skb->priority]; 135 } 136 if (!ieee80211_is_data_qos(hdr->frame_control)) { 137 skb->priority = 0; 138 return ieee802_1d_to_ac[skb->priority]; 139 } 140 141 p = ieee80211_get_qos_ctl(hdr); 142 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; 143 144 return ieee80211_downgrade_queue(sdata, NULL, skb); 145 } 146 147 u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, 148 struct sta_info *sta, struct sk_buff *skb) 149 { 150 const struct ethhdr *eth = (void *)skb->data; 151 struct mac80211_qos_map *qos_map; 152 bool qos; 153 154 /* Ensure hash is set prior to potential SW encryption */ 155 skb_get_hash(skb); 156 157 /* all mesh/ocb stations are required to support WME */ 158 if ((sdata->vif.type == NL80211_IFTYPE_MESH_POINT && 159 !is_multicast_ether_addr(eth->h_dest)) || 160 (sdata->vif.type == NL80211_IFTYPE_OCB && sta)) 161 qos = true; 162 else if (sta) 163 qos = sta->sta.wme; 164 else 165 qos = false; 166 167 if (!qos) { 168 skb->priority = 0; /* required for correct WPA/11i MIC */ 169 return IEEE80211_AC_BE; 170 } 171 172 if (skb->protocol == sdata->control_port_protocol) { 173 skb->priority = 7; 174 goto downgrade; 175 } 176 177 /* use the data classifier to determine what 802.1d tag the 178 * data frame has */ 179 qos_map = rcu_dereference(sdata->qos_map); 180 skb->priority = cfg80211_classify8021d(skb, qos_map ? 181 &qos_map->qos_map : NULL); 182 183 downgrade: 184 return ieee80211_downgrade_queue(sdata, sta, skb); 185 } 186 187 /** 188 * ieee80211_set_qos_hdr - Fill in the QoS header if there is one. 189 * 190 * @sdata: local subif 191 * @skb: packet to be updated 192 */ 193 void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata, 194 struct sk_buff *skb) 195 { 196 struct ieee80211_hdr *hdr = (void *)skb->data; 197 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 198 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 199 u8 flags; 200 u8 *p; 201 202 if (!ieee80211_is_data_qos(hdr->frame_control)) 203 return; 204 205 p = ieee80211_get_qos_ctl(hdr); 206 207 /* don't overwrite the QoS field of injected frames */ 208 if (info->flags & IEEE80211_TX_CTL_INJECTED) { 209 /* do take into account Ack policy of injected frames */ 210 if (*p & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 211 info->flags |= IEEE80211_TX_CTL_NO_ACK; 212 return; 213 } 214 215 /* set up the first byte */ 216 217 /* 218 * preserve everything but the TID and ACK policy 219 * (which we both write here) 220 */ 221 flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK | 222 IEEE80211_QOS_CTL_ACK_POLICY_MASK); 223 224 if (is_multicast_ether_addr(hdr->addr1) || 225 sdata->noack_map & BIT(tid)) { 226 flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK; 227 info->flags |= IEEE80211_TX_CTL_NO_ACK; 228 } 229 230 *p = flags | tid; 231 232 /* set up the second byte */ 233 p++; 234 235 if (ieee80211_vif_is_mesh(&sdata->vif)) { 236 /* preserve RSPI and Mesh PS Level bit */ 237 *p &= ((IEEE80211_QOS_CTL_RSPI | 238 IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8); 239 240 /* Nulls don't have a mesh header (frame body) */ 241 if (!ieee80211_is_qos_nullfunc(hdr->frame_control)) 242 *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8); 243 } else { 244 *p = 0; 245 } 246 } 247