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f0706e82 JB |
1 | /* |
2 | * Copyright 2004, Instant802 Networks, Inc. | |
d98ad83e | 3 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
f0706e82 JB |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/netdevice.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/if_arp.h> | |
14 | #include <linux/types.h> | |
15 | #include <net/ip.h> | |
16 | #include <net/pkt_sched.h> | |
17 | ||
18 | #include <net/mac80211.h> | |
19 | #include "ieee80211_i.h" | |
20 | #include "wme.h" | |
21 | ||
51cb6db0 | 22 | /* Default mapping in classifier to work with default |
e100bb64 JB |
23 | * queue setup. |
24 | */ | |
4bce22b9 JB |
25 | const int ieee802_1d_to_ac[8] = { |
26 | IEEE80211_AC_BE, | |
27 | IEEE80211_AC_BK, | |
28 | IEEE80211_AC_BK, | |
29 | IEEE80211_AC_BE, | |
30 | IEEE80211_AC_VI, | |
31 | IEEE80211_AC_VI, | |
32 | IEEE80211_AC_VO, | |
33 | IEEE80211_AC_VO | |
34 | }; | |
f0706e82 | 35 | |
51cb6db0 | 36 | static int wme_downgrade_ac(struct sk_buff *skb) |
f0706e82 JB |
37 | { |
38 | switch (skb->priority) { | |
39 | case 6: | |
40 | case 7: | |
41 | skb->priority = 5; /* VO -> VI */ | |
42 | return 0; | |
43 | case 4: | |
44 | case 5: | |
45 | skb->priority = 3; /* VI -> BE */ | |
46 | return 0; | |
47 | case 0: | |
48 | case 3: | |
49 | skb->priority = 2; /* BE -> BK */ | |
50 | return 0; | |
51 | default: | |
52 | return -1; | |
53 | } | |
54 | } | |
55 | ||
00e96dec | 56 | static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata, |
02219b3a | 57 | struct sta_info *sta, struct sk_buff *skb) |
4670cf7a | 58 | { |
02219b3a JB |
59 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
60 | ||
4670cf7a | 61 | /* in case we are a client verify acm is not set for this ac */ |
02219b3a JB |
62 | while (sdata->wmm_acm & BIT(skb->priority)) { |
63 | int ac = ieee802_1d_to_ac[skb->priority]; | |
64 | ||
65 | if (ifmgd->tx_tspec[ac].admitted_time && | |
66 | skb->priority == ifmgd->tx_tspec[ac].up) | |
67 | return ac; | |
68 | ||
4670cf7a JB |
69 | if (wme_downgrade_ac(skb)) { |
70 | /* | |
71 | * This should not really happen. The AP has marked all | |
72 | * lower ACs to require admission control which is not | |
73 | * a reasonable configuration. Allow the frame to be | |
74 | * transmitted using AC_BK as a workaround. | |
75 | */ | |
76 | break; | |
77 | } | |
78 | } | |
79 | ||
80 | /* look up which queue to use for frames with this 1d tag */ | |
81 | return ieee802_1d_to_ac[skb->priority]; | |
82 | } | |
83 | ||
d3c1597b | 84 | /* Indicate which queue to use for this fully formed 802.11 frame */ |
00e96dec | 85 | u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata, |
d3c1597b TP |
86 | struct sk_buff *skb, |
87 | struct ieee80211_hdr *hdr) | |
88 | { | |
00e96dec | 89 | struct ieee80211_local *local = sdata->local; |
d3c1597b TP |
90 | u8 *p; |
91 | ||
32c5057b | 92 | if (local->hw.queues < IEEE80211_NUM_ACS) |
d3c1597b TP |
93 | return 0; |
94 | ||
95 | if (!ieee80211_is_data(hdr->frame_control)) { | |
96 | skb->priority = 7; | |
97 | return ieee802_1d_to_ac[skb->priority]; | |
98 | } | |
99 | if (!ieee80211_is_data_qos(hdr->frame_control)) { | |
100 | skb->priority = 0; | |
101 | return ieee802_1d_to_ac[skb->priority]; | |
102 | } | |
103 | ||
104 | p = ieee80211_get_qos_ctl(hdr); | |
105 | skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; | |
106 | ||
02219b3a | 107 | return ieee80211_downgrade_queue(sdata, NULL, skb); |
d3c1597b | 108 | } |
f0706e82 | 109 | |
cf0277e7 JB |
110 | /* Indicate which queue to use. */ |
111 | u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, | |
112 | struct sk_buff *skb) | |
f0706e82 | 113 | { |
cf0277e7 JB |
114 | struct ieee80211_local *local = sdata->local; |
115 | struct sta_info *sta = NULL; | |
cf0277e7 JB |
116 | const u8 *ra = NULL; |
117 | bool qos = false; | |
32db6b54 | 118 | struct mac80211_qos_map *qos_map; |
02219b3a | 119 | u16 ret; |
f0706e82 | 120 | |
32c5057b | 121 | if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) { |
cf0277e7 | 122 | skb->priority = 0; /* required for correct WPA/11i MIC */ |
ded81f6b | 123 | return 0; |
cf0277e7 JB |
124 | } |
125 | ||
126 | rcu_read_lock(); | |
127 | switch (sdata->vif.type) { | |
128 | case NL80211_IFTYPE_AP_VLAN: | |
cf0277e7 | 129 | sta = rcu_dereference(sdata->u.vlan.sta); |
17212846 | 130 | if (sta) { |
a74a8c84 | 131 | qos = sta->sta.wme; |
cf0277e7 | 132 | break; |
17212846 | 133 | } |
cf0277e7 JB |
134 | case NL80211_IFTYPE_AP: |
135 | ra = skb->data; | |
136 | break; | |
137 | case NL80211_IFTYPE_WDS: | |
138 | ra = sdata->u.wds.remote_addr; | |
139 | break; | |
140 | #ifdef CONFIG_MAC80211_MESH | |
141 | case NL80211_IFTYPE_MESH_POINT: | |
d0ce1855 | 142 | qos = true; |
cf0277e7 JB |
143 | break; |
144 | #endif | |
145 | case NL80211_IFTYPE_STATION: | |
146 | ra = sdata->u.mgd.bssid; | |
147 | break; | |
148 | case NL80211_IFTYPE_ADHOC: | |
149 | ra = skb->data; | |
150 | break; | |
239281f8 RL |
151 | case NL80211_IFTYPE_OCB: |
152 | /* all stations are required to support WME */ | |
153 | qos = true; | |
154 | break; | |
cf0277e7 JB |
155 | default: |
156 | break; | |
f0706e82 JB |
157 | } |
158 | ||
cf0277e7 JB |
159 | if (!sta && ra && !is_multicast_ether_addr(ra)) { |
160 | sta = sta_info_get(sdata, ra); | |
161 | if (sta) | |
a74a8c84 | 162 | qos = sta->sta.wme; |
f0706e82 | 163 | } |
cf0277e7 JB |
164 | |
165 | if (!qos) { | |
f0706e82 | 166 | skb->priority = 0; /* required for correct WPA/11i MIC */ |
02219b3a JB |
167 | ret = IEEE80211_AC_BE; |
168 | goto out; | |
f0706e82 JB |
169 | } |
170 | ||
1bf4bbb4 FF |
171 | if (skb->protocol == sdata->control_port_protocol) { |
172 | skb->priority = 7; | |
02219b3a | 173 | goto downgrade; |
1bf4bbb4 FF |
174 | } |
175 | ||
f0706e82 | 176 | /* use the data classifier to determine what 802.1d tag the |
3c3b00ca | 177 | * data frame has */ |
32db6b54 KP |
178 | qos_map = rcu_dereference(sdata->qos_map); |
179 | skb->priority = cfg80211_classify8021d(skb, qos_map ? | |
180 | &qos_map->qos_map : NULL); | |
f0706e82 | 181 | |
02219b3a JB |
182 | downgrade: |
183 | ret = ieee80211_downgrade_queue(sdata, sta, skb); | |
184 | out: | |
185 | rcu_read_unlock(); | |
186 | return ret; | |
cf0277e7 JB |
187 | } |
188 | ||
40aefedc MP |
189 | /** |
190 | * ieee80211_set_qos_hdr - Fill in the QoS header if there is one. | |
191 | * | |
192 | * @sdata: local subif | |
193 | * @skb: packet to be updated | |
194 | */ | |
2154c81c JC |
195 | void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata, |
196 | struct sk_buff *skb) | |
f0706e82 | 197 | { |
cf0277e7 | 198 | struct ieee80211_hdr *hdr = (void *)skb->data; |
b53be792 | 199 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
40aefedc MP |
200 | u8 *p; |
201 | u8 ack_policy, tid; | |
cf0277e7 | 202 | |
40aefedc MP |
203 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
204 | return; | |
cf0277e7 | 205 | |
40aefedc MP |
206 | p = ieee80211_get_qos_ctl(hdr); |
207 | tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; | |
68629c61 | 208 | |
40aefedc MP |
209 | /* preserve EOSP bit */ |
210 | ack_policy = *p & IEEE80211_QOS_CTL_EOSP; | |
b53be792 | 211 | |
40aefedc MP |
212 | if (is_multicast_ether_addr(hdr->addr1) || |
213 | sdata->noack_map & BIT(tid)) { | |
214 | ack_policy |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK; | |
215 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
f0706e82 | 216 | } |
40aefedc MP |
217 | |
218 | /* qos header is 2 bytes */ | |
219 | *p++ = ack_policy | tid; | |
3f52b7e3 MP |
220 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
221 | /* preserve RSPI and Mesh PS Level bit */ | |
222 | *p &= ((IEEE80211_QOS_CTL_RSPI | | |
223 | IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8); | |
224 | ||
225 | /* Nulls don't have a mesh header (frame body) */ | |
226 | if (!ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
227 | *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8); | |
228 | } else { | |
229 | *p = 0; | |
230 | } | |
f0706e82 | 231 | } |