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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 | |
21 | /* Default mapping in classifier to work with default |
22 | * queue setup. |
23 | */ |
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 | }; |
34 | |
35 | static int wme_downgrade_ac(struct sk_buff *skb) |
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 | /* Indicate which queue to use for this fully formed 802.11 frame */ |
56 | u16 ieee80211_select_queue_80211(struct ieee80211_local *local, |
57 | struct sk_buff *skb, |
58 | struct ieee80211_hdr *hdr) |
59 | { |
60 | u8 *p; |
61 | |
62 | if (local->hw.queues < 4) |
63 | return 0; |
64 | |
65 | if (!ieee80211_is_data(hdr->frame_control)) { |
66 | skb->priority = 7; |
67 | return ieee802_1d_to_ac[skb->priority]; |
68 | } |
69 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
70 | skb->priority = 0; |
71 | return ieee802_1d_to_ac[skb->priority]; |
72 | } |
73 | |
74 | p = ieee80211_get_qos_ctl(hdr); |
75 | skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; |
76 | |
77 | return ieee80211_downgrade_queue(local, skb); |
78 | } |
79 | |
80 | /* Indicate which queue to use. */ |
81 | u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, |
82 | struct sk_buff *skb) |
83 | { |
84 | struct ieee80211_local *local = sdata->local; |
85 | struct sta_info *sta = NULL; |
86 | const u8 *ra = NULL; |
87 | bool qos = false; |
88 | |
89 | if (local->hw.queues < 4 || skb->len < 6) { |
90 | skb->priority = 0; /* required for correct WPA/11i MIC */ |
91 | return min_t(u16, local->hw.queues - 1, IEEE80211_AC_BE); |
92 | } |
93 | |
94 | rcu_read_lock(); |
95 | switch (sdata->vif.type) { |
96 | case NL80211_IFTYPE_AP_VLAN: |
97 | sta = rcu_dereference(sdata->u.vlan.sta); |
98 | if (sta) { |
99 | qos = test_sta_flag(sta, WLAN_STA_WME); |
100 | break; |
101 | } |
102 | case NL80211_IFTYPE_AP: |
103 | ra = skb->data; |
104 | break; |
105 | case NL80211_IFTYPE_WDS: |
106 | ra = sdata->u.wds.remote_addr; |
107 | break; |
108 | #ifdef CONFIG_MAC80211_MESH |
109 | case NL80211_IFTYPE_MESH_POINT: |
110 | qos = true; |
111 | break; |
112 | #endif |
113 | case NL80211_IFTYPE_STATION: |
114 | ra = sdata->u.mgd.bssid; |
115 | break; |
116 | case NL80211_IFTYPE_ADHOC: |
117 | ra = skb->data; |
118 | break; |
119 | default: |
120 | break; |
121 | } |
122 | |
123 | if (!sta && ra && !is_multicast_ether_addr(ra)) { |
124 | sta = sta_info_get(sdata, ra); |
125 | if (sta) |
126 | qos = test_sta_flag(sta, WLAN_STA_WME); |
127 | } |
128 | rcu_read_unlock(); |
129 | |
130 | if (!qos) { |
131 | skb->priority = 0; /* required for correct WPA/11i MIC */ |
132 | return IEEE80211_AC_BE; |
133 | } |
134 | |
135 | /* use the data classifier to determine what 802.1d tag the |
136 | * data frame has */ |
137 | skb->priority = cfg80211_classify8021d(skb); |
138 | |
139 | return ieee80211_downgrade_queue(local, skb); |
140 | } |
141 | |
142 | u16 ieee80211_downgrade_queue(struct ieee80211_local *local, |
143 | struct sk_buff *skb) |
144 | { |
145 | /* in case we are a client verify acm is not set for this ac */ |
146 | while (unlikely(local->wmm_acm & BIT(skb->priority))) { |
147 | if (wme_downgrade_ac(skb)) { |
148 | /* |
149 | * This should not really happen. The AP has marked all |
150 | * lower ACs to require admission control which is not |
151 | * a reasonable configuration. Allow the frame to be |
152 | * transmitted using AC_BK as a workaround. |
153 | */ |
154 | break; |
155 | } |
156 | } |
157 | |
158 | /* look up which queue to use for frames with this 1d tag */ |
159 | return ieee802_1d_to_ac[skb->priority]; |
160 | } |
161 | |
162 | void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata, |
163 | struct sk_buff *skb) |
164 | { |
165 | struct ieee80211_hdr *hdr = (void *)skb->data; |
166 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
167 | |
168 | /* Fill in the QoS header if there is one. */ |
169 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
170 | u8 *p = ieee80211_get_qos_ctl(hdr); |
171 | u8 ack_policy, tid; |
172 | |
173 | tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; |
174 | |
175 | /* preserve EOSP bit */ |
176 | ack_policy = *p & IEEE80211_QOS_CTL_EOSP; |
177 | |
178 | if (is_multicast_ether_addr(hdr->addr1) || |
179 | sdata->noack_map & BIT(tid)) { |
180 | ack_policy |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK; |
181 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
182 | } |
183 | |
184 | /* qos header is 2 bytes */ |
185 | *p++ = ack_policy | tid; |
186 | *p = ieee80211_vif_is_mesh(&sdata->vif) ? |
187 | (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8) : 0; |
188 | } |
189 | } |
190 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9