1 /* SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1) */
2 /*
3  *
4  * Ether/802.11 conversions and packet buffer routines
5  *
6  * Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
7  * --------------------------------------------------------------------
8  *
9  * linux-wlan
10  *
11  *   The contents of this file are subject to the Mozilla Public
12  *   License Version 1.1 (the "License"); you may not use this file
13  *   except in compliance with the License. You may obtain a copy of
14  *   the License at http://www.mozilla.org/MPL/
15  *
16  *   Software distributed under the License is distributed on an "AS
17  *   IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
18  *   implied. See the License for the specific language governing
19  *   rights and limitations under the License.
20  *
21  *   Alternatively, the contents of this file may be used under the
22  *   terms of the GNU Public License version 2 (the "GPL"), in which
23  *   case the provisions of the GPL are applicable instead of the
24  *   above.  If you wish to allow the use of your version of this file
25  *   only under the terms of the GPL and not to allow others to use
26  *   your version of this file under the MPL, indicate your decision
27  *   by deleting the provisions above and replace them with the notice
28  *   and other provisions required by the GPL.  If you do not delete
29  *   the provisions above, a recipient may use your version of this
30  *   file under either the MPL or the GPL.
31  *
32  * --------------------------------------------------------------------
33  *
34  * Inquiries regarding the linux-wlan Open Source project can be
35  * made directly to:
36  *
37  * AbsoluteValue Systems Inc.
38  * info@linux-wlan.com
39  * http://www.linux-wlan.com
40  *
41  * --------------------------------------------------------------------
42  *
43  * Portions of the development of this software were funded by
44  * Intersil Corporation as part of PRISM(R) chipset product development.
45  *
46  * --------------------------------------------------------------------
47  *
48  * This file declares the functions, types and macros that perform
49  * Ethernet to/from 802.11 frame conversions.
50  *
51  * --------------------------------------------------------------------
52  */
53 
54 #ifndef _LINUX_P80211CONV_H
55 #define _LINUX_P80211CONV_H
56 
57 #define WLAN_IEEE_OUI_LEN	3
58 
59 #define WLAN_ETHCONV_ENCAP	1
60 #define WLAN_ETHCONV_8021h	3
61 
62 #define P80211CAPTURE_VERSION	0x80211001
63 
64 #define	P80211_FRMMETA_MAGIC	0x802110
65 
66 struct p80211_rxmeta {
67 	struct wlandevice *wlandev;
68 
69 	u64 mactime;		/* Hi-rez MAC-supplied time value */
70 	u64 hosttime;		/* Best-rez host supplied time value */
71 
72 	unsigned int rxrate;	/* Receive data rate in 100kbps */
73 	unsigned int priority;	/* 0-15, 0=contention, 6=CF */
74 	int signal;		/* An SSI, see p80211netdev.h */
75 	int noise;		/* An SSI, see p80211netdev.h */
76 	unsigned int channel;	/* Receive channel (mostly for snifs) */
77 	unsigned int preamble;	/* P80211ENUM_preambletype_* */
78 	unsigned int encoding;	/* P80211ENUM_encoding_* */
79 
80 };
81 
82 struct p80211_frmmeta {
83 	unsigned int magic;
84 	struct p80211_rxmeta *rx;
85 };
86 
87 void p80211skb_free(struct wlandevice *wlandev, struct sk_buff *skb);
88 int p80211skb_rxmeta_attach(struct wlandevice *wlandev, struct sk_buff *skb);
89 void p80211skb_rxmeta_detach(struct sk_buff *skb);
90 
p80211skb_frmmeta(struct sk_buff * skb)91 static inline struct p80211_frmmeta *p80211skb_frmmeta(struct sk_buff *skb)
92 {
93 	struct p80211_frmmeta *frmmeta = (struct p80211_frmmeta *)skb->cb;
94 
95 	return frmmeta->magic == P80211_FRMMETA_MAGIC ? frmmeta : NULL;
96 }
97 
p80211skb_rxmeta(struct sk_buff * skb)98 static inline struct p80211_rxmeta *p80211skb_rxmeta(struct sk_buff *skb)
99 {
100 	struct p80211_frmmeta *frmmeta = p80211skb_frmmeta(skb);
101 
102 	return frmmeta ? frmmeta->rx : NULL;
103 }
104 
105 /*
106  * Frame capture header.  (See doc/capturefrm.txt)
107  */
108 struct p80211_caphdr {
109 	__be32 version;
110 	__be32 length;
111 	__be64 mactime;
112 	__be64 hosttime;
113 	__be32 phytype;
114 	__be32 channel;
115 	__be32 datarate;
116 	__be32 antenna;
117 	__be32 priority;
118 	__be32 ssi_type;
119 	__be32 ssi_signal;
120 	__be32 ssi_noise;
121 	__be32 preamble;
122 	__be32 encoding;
123 };
124 
125 struct p80211_metawep {
126 	void *data;
127 	u8 iv[4];
128 	u8 icv[4];
129 };
130 
131 /* local ether header type */
132 struct wlan_ethhdr {
133 	u8 daddr[ETH_ALEN];
134 	u8 saddr[ETH_ALEN];
135 	__be16 type;
136 } __packed;
137 
138 /* local llc header type */
139 struct wlan_llc {
140 	u8 dsap;
141 	u8 ssap;
142 	u8 ctl;
143 } __packed;
144 
145 /* local snap header type */
146 struct wlan_snap {
147 	u8 oui[WLAN_IEEE_OUI_LEN];
148 	__be16 type;
149 } __packed;
150 
151 /* Circular include trick */
152 struct wlandevice;
153 
154 int skb_p80211_to_ether(struct wlandevice *wlandev, u32 ethconv,
155 			struct sk_buff *skb);
156 int skb_ether_to_p80211(struct wlandevice *wlandev, u32 ethconv,
157 			struct sk_buff *skb, struct p80211_hdr *p80211_hdr,
158 			struct p80211_metawep *p80211_wep);
159 
160 int p80211_stt_findproto(u16 proto);
161 
162 #endif
163