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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] = { 2, 3, 3, 2, 1, 1, 0, 0 }; |
25 | |
26 | static int wme_downgrade_ac(struct sk_buff *skb) |
27 | { |
28 | switch (skb->priority) { |
29 | case 6: |
30 | case 7: |
31 | skb->priority = 5; /* VO -> VI */ |
32 | return 0; |
33 | case 4: |
34 | case 5: |
35 | skb->priority = 3; /* VI -> BE */ |
36 | return 0; |
37 | case 0: |
38 | case 3: |
39 | skb->priority = 2; /* BE -> BK */ |
40 | return 0; |
41 | default: |
42 | return -1; |
43 | } |
44 | } |
45 | |
46 | |
47 | /* Indicate which queue to use. */ |
48 | u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, |
49 | struct sk_buff *skb) |
50 | { |
51 | struct ieee80211_local *local = sdata->local; |
52 | struct sta_info *sta = NULL; |
53 | u32 sta_flags = 0; |
54 | const u8 *ra = NULL; |
55 | bool qos = false; |
56 | |
57 | if (local->hw.queues < 4 || skb->len < 6) { |
58 | skb->priority = 0; /* required for correct WPA/11i MIC */ |
59 | return min_t(u16, local->hw.queues - 1, |
60 | ieee802_1d_to_ac[skb->priority]); |
61 | } |
62 | |
63 | rcu_read_lock(); |
64 | switch (sdata->vif.type) { |
65 | case NL80211_IFTYPE_AP_VLAN: |
66 | rcu_read_lock(); |
67 | sta = rcu_dereference(sdata->u.vlan.sta); |
68 | if (sta) |
69 | sta_flags = get_sta_flags(sta); |
70 | rcu_read_unlock(); |
71 | if (sta) |
72 | break; |
73 | case NL80211_IFTYPE_AP: |
74 | ra = skb->data; |
75 | break; |
76 | case NL80211_IFTYPE_WDS: |
77 | ra = sdata->u.wds.remote_addr; |
78 | break; |
79 | #ifdef CONFIG_MAC80211_MESH |
80 | case NL80211_IFTYPE_MESH_POINT: |
81 | /* |
82 | * XXX: This is clearly broken ... but already was before, |
83 | * because ieee80211_fill_mesh_addresses() would clear A1 |
84 | * except for multicast addresses. |
85 | */ |
86 | break; |
87 | #endif |
88 | case NL80211_IFTYPE_STATION: |
89 | ra = sdata->u.mgd.bssid; |
90 | break; |
91 | case NL80211_IFTYPE_ADHOC: |
92 | ra = skb->data; |
93 | break; |
94 | default: |
95 | break; |
96 | } |
97 | |
98 | if (!sta && ra && !is_multicast_ether_addr(ra)) { |
99 | sta = sta_info_get(sdata, ra); |
100 | if (sta) |
101 | sta_flags = get_sta_flags(sta); |
102 | } |
103 | |
104 | if (sta_flags & WLAN_STA_WME) |
105 | qos = true; |
106 | |
107 | rcu_read_unlock(); |
108 | |
109 | if (!qos) { |
110 | skb->priority = 0; /* required for correct WPA/11i MIC */ |
111 | return ieee802_1d_to_ac[skb->priority]; |
112 | } |
113 | |
114 | /* use the data classifier to determine what 802.1d tag the |
115 | * data frame has */ |
116 | skb->priority = cfg80211_classify8021d(skb); |
117 | |
118 | return ieee80211_downgrade_queue(local, skb); |
119 | } |
120 | |
121 | u16 ieee80211_downgrade_queue(struct ieee80211_local *local, |
122 | struct sk_buff *skb) |
123 | { |
124 | /* in case we are a client verify acm is not set for this ac */ |
125 | while (unlikely(local->wmm_acm & BIT(skb->priority))) { |
126 | if (wme_downgrade_ac(skb)) { |
127 | /* |
128 | * This should not really happen. The AP has marked all |
129 | * lower ACs to require admission control which is not |
130 | * a reasonable configuration. Allow the frame to be |
131 | * transmitted using AC_BK as a workaround. |
132 | */ |
133 | break; |
134 | } |
135 | } |
136 | |
137 | /* look up which queue to use for frames with this 1d tag */ |
138 | return ieee802_1d_to_ac[skb->priority]; |
139 | } |
140 | |
141 | void ieee80211_set_qos_hdr(struct ieee80211_local *local, struct sk_buff *skb) |
142 | { |
143 | struct ieee80211_hdr *hdr = (void *)skb->data; |
144 | |
145 | /* Fill in the QoS header if there is one. */ |
146 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
147 | u8 *p = ieee80211_get_qos_ctl(hdr); |
148 | u8 ack_policy = 0, tid; |
149 | |
150 | tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; |
151 | |
152 | if (unlikely(local->wifi_wme_noack_test)) |
153 | ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK << |
154 | QOS_CONTROL_ACK_POLICY_SHIFT; |
155 | /* qos header is 2 bytes, second reserved */ |
156 | *p++ = ack_policy | tid; |
157 | *p = 0; |
158 | } |
159 | } |
160 |
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