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f0706e82 JB |
1 | /* |
2 | * Copyright 2004, Instant802 Networks, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/netdevice.h> | |
10 | #include <linux/skbuff.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/if_arp.h> | |
13 | #include <linux/types.h> | |
14 | #include <net/ip.h> | |
15 | #include <net/pkt_sched.h> | |
16 | ||
17 | #include <net/mac80211.h> | |
18 | #include "ieee80211_i.h" | |
19 | #include "wme.h" | |
20 | ||
51cb6db0 | 21 | /* Default mapping in classifier to work with default |
e100bb64 JB |
22 | * queue setup. |
23 | */ | |
4bce22b9 JB |
24 | const int ieee802_1d_to_ac[8] = { |
25 | IEEE80211_AC_BE, | |
26 | IEEE80211_AC_BK, | |
27 | IEEE80211_AC_BK, | |
28 | IEEE80211_AC_BE, | |
29 | IEEE80211_AC_VI, | |
30 | IEEE80211_AC_VI, | |
31 | IEEE80211_AC_VO, | |
32 | IEEE80211_AC_VO | |
33 | }; | |
f0706e82 | 34 | |
51cb6db0 | 35 | static int wme_downgrade_ac(struct sk_buff *skb) |
f0706e82 JB |
36 | { |
37 | switch (skb->priority) { | |
38 | case 6: | |
39 | case 7: | |
40 | skb->priority = 5; /* VO -> VI */ | |
41 | return 0; | |
42 | case 4: | |
43 | case 5: | |
44 | skb->priority = 3; /* VI -> BE */ | |
45 | return 0; | |
46 | case 0: | |
47 | case 3: | |
48 | skb->priority = 2; /* BE -> BK */ | |
49 | return 0; | |
50 | default: | |
51 | return -1; | |
52 | } | |
53 | } | |
54 | ||
55 | ||
cf0277e7 JB |
56 | /* Indicate which queue to use. */ |
57 | u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, | |
58 | struct sk_buff *skb) | |
f0706e82 | 59 | { |
cf0277e7 JB |
60 | struct ieee80211_local *local = sdata->local; |
61 | struct sta_info *sta = NULL; | |
cf0277e7 JB |
62 | const u8 *ra = NULL; |
63 | bool qos = false; | |
f0706e82 | 64 | |
cf0277e7 JB |
65 | if (local->hw.queues < 4 || skb->len < 6) { |
66 | skb->priority = 0; /* required for correct WPA/11i MIC */ | |
17212846 | 67 | return min_t(u16, local->hw.queues - 1, IEEE80211_AC_BE); |
cf0277e7 JB |
68 | } |
69 | ||
70 | rcu_read_lock(); | |
71 | switch (sdata->vif.type) { | |
72 | case NL80211_IFTYPE_AP_VLAN: | |
cf0277e7 | 73 | sta = rcu_dereference(sdata->u.vlan.sta); |
17212846 JB |
74 | if (sta) { |
75 | qos = get_sta_flags(sta) & WLAN_STA_WME; | |
cf0277e7 | 76 | break; |
17212846 | 77 | } |
cf0277e7 JB |
78 | case NL80211_IFTYPE_AP: |
79 | ra = skb->data; | |
80 | break; | |
81 | case NL80211_IFTYPE_WDS: | |
82 | ra = sdata->u.wds.remote_addr; | |
83 | break; | |
84 | #ifdef CONFIG_MAC80211_MESH | |
85 | case NL80211_IFTYPE_MESH_POINT: | |
86 | /* | |
87 | * XXX: This is clearly broken ... but already was before, | |
88 | * because ieee80211_fill_mesh_addresses() would clear A1 | |
89 | * except for multicast addresses. | |
90 | */ | |
91 | break; | |
92 | #endif | |
93 | case NL80211_IFTYPE_STATION: | |
94 | ra = sdata->u.mgd.bssid; | |
95 | break; | |
96 | case NL80211_IFTYPE_ADHOC: | |
97 | ra = skb->data; | |
98 | break; | |
99 | default: | |
100 | break; | |
f0706e82 JB |
101 | } |
102 | ||
cf0277e7 JB |
103 | if (!sta && ra && !is_multicast_ether_addr(ra)) { |
104 | sta = sta_info_get(sdata, ra); | |
105 | if (sta) | |
17212846 | 106 | qos = get_sta_flags(sta) & WLAN_STA_WME; |
f0706e82 | 107 | } |
cf0277e7 JB |
108 | rcu_read_unlock(); |
109 | ||
110 | if (!qos) { | |
f0706e82 | 111 | skb->priority = 0; /* required for correct WPA/11i MIC */ |
17212846 | 112 | return IEEE80211_AC_BE; |
f0706e82 JB |
113 | } |
114 | ||
115 | /* use the data classifier to determine what 802.1d tag the | |
3c3b00ca | 116 | * data frame has */ |
e31a16d6 | 117 | skb->priority = cfg80211_classify8021d(skb); |
f0706e82 | 118 | |
cf0277e7 JB |
119 | return ieee80211_downgrade_queue(local, skb); |
120 | } | |
121 | ||
122 | u16 ieee80211_downgrade_queue(struct ieee80211_local *local, | |
123 | struct sk_buff *skb) | |
124 | { | |
3c3b00ca | 125 | /* in case we are a client verify acm is not set for this ac */ |
f0706e82 JB |
126 | while (unlikely(local->wmm_acm & BIT(skb->priority))) { |
127 | if (wme_downgrade_ac(skb)) { | |
0eeb59fe JM |
128 | /* |
129 | * This should not really happen. The AP has marked all | |
130 | * lower ACs to require admission control which is not | |
131 | * a reasonable configuration. Allow the frame to be | |
132 | * transmitted using AC_BK as a workaround. | |
51cb6db0 | 133 | */ |
0eeb59fe | 134 | break; |
f0706e82 JB |
135 | } |
136 | } | |
137 | ||
138 | /* look up which queue to use for frames with this 1d tag */ | |
139 | return ieee802_1d_to_ac[skb->priority]; | |
140 | } | |
141 | ||
cf0277e7 | 142 | void ieee80211_set_qos_hdr(struct ieee80211_local *local, struct sk_buff *skb) |
f0706e82 | 143 | { |
cf0277e7 JB |
144 | struct ieee80211_hdr *hdr = (void *)skb->data; |
145 | ||
146 | /* Fill in the QoS header if there is one. */ | |
8f77f384 | 147 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
002aaf4e | 148 | u8 *p = ieee80211_get_qos_ctl(hdr); |
cf0277e7 JB |
149 | u8 ack_policy = 0, tid; |
150 | ||
238f74a2 | 151 | tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; |
cf0277e7 | 152 | |
d3707d99 | 153 | if (unlikely(local->wifi_wme_noack_test)) |
9e723492 | 154 | ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK << |
f0706e82 JB |
155 | QOS_CONTROL_ACK_POLICY_SHIFT; |
156 | /* qos header is 2 bytes, second reserved */ | |
002aaf4e | 157 | *p++ = ack_policy | tid; |
f0706e82 JB |
158 | *p = 0; |
159 | } | |
f0706e82 | 160 | } |