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(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(fc: hdr->frame_control)) { |
133 | skb->priority = 7; |
134 | return ieee802_1d_to_ac[skb->priority]; |
135 | } |
136 | if (!ieee80211_is_data_qos(fc: 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(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: 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(fc: 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(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(vif: &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(fc: hdr->frame_control)) |
242 | *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8); |
243 | } else { |
244 | *p = 0; |
245 | } |
246 | } |
247 | |