summaryrefslogtreecommitdiffstats
path: root/net/batman-adv/packet.h
blob: 1c5454d33f67425c69636160c5bf1182608c75e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
/* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#ifndef _NET_BATMAN_ADV_PACKET_H_
#define _NET_BATMAN_ADV_PACKET_H_

#define BATADV_ETH_P_BATMAN  0x4305 /* unofficial/not registered Ethertype */

enum batadv_packettype {
	BATADV_IV_OGM		= 0x01,
	BATADV_ICMP		= 0x02,
	BATADV_UNICAST		= 0x03,
	BATADV_BCAST		= 0x04,
	BATADV_VIS		= 0x05,
	BATADV_UNICAST_FRAG	= 0x06,
	BATADV_TT_QUERY		= 0x07,
	BATADV_ROAM_ADV		= 0x08,
	BATADV_UNICAST_4ADDR	= 0x09,
};

/**
 * enum batadv_subtype - packet subtype for unicast4addr
 * @BATADV_P_DATA: user payload
 * @BATADV_P_DAT_DHT_GET: DHT request message
 * @BATADV_P_DAT_DHT_PUT: DHT store message
 * @BATADV_P_DAT_CACHE_REPLY: ARP reply generated by DAT
 */
enum batadv_subtype {
	BATADV_P_DATA			= 0x01,
	BATADV_P_DAT_DHT_GET		= 0x02,
	BATADV_P_DAT_DHT_PUT		= 0x03,
	BATADV_P_DAT_CACHE_REPLY	= 0x04,
};

/* this file is included by batctl which needs these defines */
#define BATADV_COMPAT_VERSION 14

enum batadv_iv_flags {
	BATADV_NOT_BEST_NEXT_HOP   = BIT(3),
	BATADV_PRIMARIES_FIRST_HOP = BIT(4),
	BATADV_VIS_SERVER	   = BIT(5),
	BATADV_DIRECTLINK	   = BIT(6),
};

/* ICMP message types */
enum batadv_icmp_packettype {
	BATADV_ECHO_REPLY	       = 0,
	BATADV_DESTINATION_UNREACHABLE = 3,
	BATADV_ECHO_REQUEST	       = 8,
	BATADV_TTL_EXCEEDED	       = 11,
	BATADV_PARAMETER_PROBLEM       = 12,
};

/* vis defines */
enum batadv_vis_packettype {
	BATADV_VIS_TYPE_SERVER_SYNC   = 0,
	BATADV_VIS_TYPE_CLIENT_UPDATE = 1,
};

/* fragmentation defines */
enum batadv_unicast_frag_flags {
	BATADV_UNI_FRAG_HEAD	  = BIT(0),
	BATADV_UNI_FRAG_LARGETAIL = BIT(1),
};

/* TT_QUERY subtypes */
#define BATADV_TT_QUERY_TYPE_MASK 0x3

enum batadv_tt_query_packettype {
	BATADV_TT_REQUEST  = 0,
	BATADV_TT_RESPONSE = 1,
};

/* TT_QUERY flags */
enum batadv_tt_query_flags {
	BATADV_TT_FULL_TABLE = BIT(2),
};

/* BATADV_TT_CLIENT flags.
 * Flags from BIT(0) to BIT(7) are sent on the wire, while flags from BIT(8) to
 * BIT(15) are used for local computation only
 */
enum batadv_tt_client_flags {
	BATADV_TT_CLIENT_DEL     = BIT(0),
	BATADV_TT_CLIENT_ROAM    = BIT(1),
	BATADV_TT_CLIENT_WIFI    = BIT(2),
	BATADV_TT_CLIENT_TEMP	 = BIT(3),
	BATADV_TT_CLIENT_NOPURGE = BIT(8),
	BATADV_TT_CLIENT_NEW     = BIT(9),
	BATADV_TT_CLIENT_PENDING = BIT(10),
};

/* claim frame types for the bridge loop avoidance */
enum batadv_bla_claimframe {
	BATADV_CLAIM_TYPE_CLAIM		= 0x00,
	BATADV_CLAIM_TYPE_UNCLAIM	= 0x01,
	BATADV_CLAIM_TYPE_ANNOUNCE	= 0x02,
	BATADV_CLAIM_TYPE_REQUEST	= 0x03,
};

/* the destination hardware field in the ARP frame is used to
 * transport the claim type and the group id
 */
struct batadv_bla_claim_dst {
	uint8_t magic[3];	/* FF:43:05 */
	uint8_t type;		/* bla_claimframe */
	__be16 group;		/* group id */
};

struct batadv_header {
	uint8_t  packet_type;
	uint8_t  version;  /* batman version field */
	uint8_t  ttl;
	/* the parent struct has to add a byte after the header to make
	 * everything 4 bytes aligned again
	 */
};

struct batadv_ogm_packet {
	struct batadv_header header;
	uint8_t  flags;    /* 0x40: DIRECTLINK flag, 0x20 VIS_SERVER flag... */
	__be32   seqno;
	uint8_t  orig[ETH_ALEN];
	uint8_t  prev_sender[ETH_ALEN];
	uint8_t  gw_flags;  /* flags related to gateway class */
	uint8_t  tq;
	uint8_t  tt_num_changes;
	uint8_t  ttvn; /* translation table version number */
	__be16   tt_crc;
} __packed;

#define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)

struct batadv_icmp_packet {
	struct batadv_header header;
	uint8_t  msg_type; /* see ICMP message types above */
	uint8_t  dst[ETH_ALEN];
	uint8_t  orig[ETH_ALEN];
	__be16   seqno;
	uint8_t  uid;
	uint8_t  reserved;
};

#define BATADV_RR_LEN 16

/* icmp_packet_rr must start with all fields from imcp_packet
 * as this is assumed by code that handles ICMP packets
 */
struct batadv_icmp_packet_rr {
	struct batadv_header header;
	uint8_t  msg_type; /* see ICMP message types above */
	uint8_t  dst[ETH_ALEN];
	uint8_t  orig[ETH_ALEN];
	__be16   seqno;
	uint8_t  uid;
	uint8_t  rr_cur;
	uint8_t  rr[BATADV_RR_LEN][ETH_ALEN];
};

/* All packet headers in front of an ethernet header have to be completely
 * divisible by 2 but not by 4 to make the payload after the ethernet
 * header again 4 bytes boundary aligned.
 *
 * A packing of 2 is necessary to avoid extra padding at the end of the struct
 * caused by a structure member which is larger than two bytes. Otherwise
 * the structure would not fulfill the previously mentioned rule to avoid the
 * misalignment of the payload after the ethernet header. It may also lead to
 * leakage of information when the padding it not initialized before sending.
 */
#pragma pack(2)

struct batadv_unicast_packet {
	struct batadv_header header;
	uint8_t  ttvn; /* destination translation table version number */
	uint8_t  dest[ETH_ALEN];
	/* "4 bytes boundary + 2 bytes" long to make the payload after the
	 * following ethernet header again 4 bytes boundary aligned
	 */
};

/**
 * struct batadv_unicast_4addr_packet - extended unicast packet
 * @u: common unicast packet header
 * @src: address of the source
 * @subtype: packet subtype
 */
struct batadv_unicast_4addr_packet {
	struct batadv_unicast_packet u;
	uint8_t src[ETH_ALEN];
	uint8_t subtype;
	uint8_t reserved;
	/* "4 bytes boundary + 2 bytes" long to make the payload after the
	 * following ethernet header again 4 bytes boundary aligned
	 */
};

struct batadv_unicast_frag_packet {
	struct batadv_header header;
	uint8_t  ttvn; /* destination translation table version number */
	uint8_t  dest[ETH_ALEN];
	uint8_t  flags;
	uint8_t  align;
	uint8_t  orig[ETH_ALEN];
	__be16   seqno;
} __packed;

struct batadv_bcast_packet {
	struct batadv_header header;
	uint8_t  reserved;
	__be32   seqno;
	uint8_t  orig[ETH_ALEN];
	/* "4 bytes boundary + 2 bytes" long to make the payload after the
	 * following ethernet header again 4 bytes boundary aligned
	 */
};

#pragma pack()

struct batadv_vis_packet {
	struct batadv_header header;
	uint8_t  vis_type;	 /* which type of vis-participant sent this? */
	__be32   seqno;		 /* sequence number */
	uint8_t  entries;	 /* number of entries behind this struct */
	uint8_t  reserved;
	uint8_t  vis_orig[ETH_ALEN];	/* originator reporting its neighbors */
	uint8_t  target_orig[ETH_ALEN]; /* who should receive this packet */
	uint8_t  sender_orig[ETH_ALEN]; /* who sent or forwarded this packet */
};

struct batadv_tt_query_packet {
	struct batadv_header header;
	/* the flag field is a combination of:
	 * - TT_REQUEST or TT_RESPONSE
	 * - TT_FULL_TABLE
	 */
	uint8_t  flags;
	uint8_t  dst[ETH_ALEN];
	uint8_t  src[ETH_ALEN];
	/* the ttvn field is:
	 * if TT_REQUEST: ttvn that triggered the
	 *		  request
	 * if TT_RESPONSE: new ttvn for the src
	 *		   orig_node
	 */
	uint8_t  ttvn;
	/* tt_data field is:
	 * if TT_REQUEST: crc associated with the
	 *		  ttvn
	 * if TT_RESPONSE: table_size
	 */
	__be16 tt_data;
} __packed;

struct batadv_roam_adv_packet {
	struct batadv_header header;
	uint8_t  reserved;
	uint8_t  dst[ETH_ALEN];
	uint8_t  src[ETH_ALEN];
	uint8_t  client[ETH_ALEN];
} __packed;

struct batadv_tt_change {
	uint8_t flags;
	uint8_t addr[ETH_ALEN];
} __packed;

#endif /* _NET_BATMAN_ADV_PACKET_H_ */