summaryrefslogtreecommitdiffstats
path: root/include/net/amt.h
blob: c881bc8b673b3c47200471f9da73cbce4a6d6fd4 (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
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (c) 2021 Taehee Yoo <ap420073@gmail.com>
 */
#ifndef _NET_AMT_H_
#define _NET_AMT_H_

#include <linux/siphash.h>
#include <linux/jhash.h>
#include <linux/netdevice.h>
#include <net/gro_cells.h>
#include <net/rtnetlink.h>

enum amt_msg_type {
	AMT_MSG_DISCOVERY = 1,
	AMT_MSG_ADVERTISEMENT,
	AMT_MSG_REQUEST,
	AMT_MSG_MEMBERSHIP_QUERY,
	AMT_MSG_MEMBERSHIP_UPDATE,
	AMT_MSG_MULTICAST_DATA,
	AMT_MSG_TEARDOWN,
	__AMT_MSG_MAX,
};

#define AMT_MSG_MAX (__AMT_MSG_MAX - 1)

enum amt_ops {
	/* A*B */
	AMT_OPS_INT,
	/* A+B */
	AMT_OPS_UNI,
	/* A-B */
	AMT_OPS_SUB,
	/* B-A */
	AMT_OPS_SUB_REV,
	__AMT_OPS_MAX,
};

#define AMT_OPS_MAX (__AMT_OPS_MAX - 1)

enum amt_filter {
	AMT_FILTER_FWD,
	AMT_FILTER_D_FWD,
	AMT_FILTER_FWD_NEW,
	AMT_FILTER_D_FWD_NEW,
	AMT_FILTER_ALL,
	AMT_FILTER_NONE_NEW,
	AMT_FILTER_BOTH,
	AMT_FILTER_BOTH_NEW,
	__AMT_FILTER_MAX,
};

#define AMT_FILTER_MAX (__AMT_FILTER_MAX - 1)

enum amt_act {
	AMT_ACT_GMI,
	AMT_ACT_GMI_ZERO,
	AMT_ACT_GT,
	AMT_ACT_STATUS_FWD_NEW,
	AMT_ACT_STATUS_D_FWD_NEW,
	AMT_ACT_STATUS_NONE_NEW,
	__AMT_ACT_MAX,
};

#define AMT_ACT_MAX (__AMT_ACT_MAX - 1)

enum amt_status {
	AMT_STATUS_INIT,
	AMT_STATUS_SENT_DISCOVERY,
	AMT_STATUS_RECEIVED_DISCOVERY,
	AMT_STATUS_SENT_ADVERTISEMENT,
	AMT_STATUS_RECEIVED_ADVERTISEMENT,
	AMT_STATUS_SENT_REQUEST,
	AMT_STATUS_RECEIVED_REQUEST,
	AMT_STATUS_SENT_QUERY,
	AMT_STATUS_RECEIVED_QUERY,
	AMT_STATUS_SENT_UPDATE,
	AMT_STATUS_RECEIVED_UPDATE,
	__AMT_STATUS_MAX,
};

#define AMT_STATUS_MAX (__AMT_STATUS_MAX - 1)

/* Gateway events only */
enum amt_event {
	AMT_EVENT_NONE,
	AMT_EVENT_RECEIVE,
	AMT_EVENT_SEND_DISCOVERY,
	AMT_EVENT_SEND_REQUEST,
	__AMT_EVENT_MAX,
};

struct amt_header {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	u8 type:4,
	   version:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
	u8 version:4,
	   type:4;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
} __packed;

struct amt_header_discovery {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	u32	type:4,
		version:4,
		reserved:24;
#elif defined(__BIG_ENDIAN_BITFIELD)
	u32	version:4,
		type:4,
		reserved:24;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
	__be32	nonce;
} __packed;

struct amt_header_advertisement {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	u32	type:4,
		version:4,
		reserved:24;
#elif defined(__BIG_ENDIAN_BITFIELD)
	u32	version:4,
		type:4,
		reserved:24;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
	__be32	nonce;
	__be32	ip4;
} __packed;

struct amt_header_request {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	u32	type:4,
		version:4,
		reserved1:7,
		p:1,
		reserved2:16;
#elif defined(__BIG_ENDIAN_BITFIELD)
	u32	version:4,
		type:4,
		p:1,
		reserved1:7,
		reserved2:16;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
	__be32	nonce;
} __packed;

struct amt_header_membership_query {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	u64	type:4,
		version:4,
		reserved:6,
		l:1,
		g:1,
		response_mac:48;
#elif defined(__BIG_ENDIAN_BITFIELD)
	u64	version:4,
		type:4,
		g:1,
		l:1,
		reserved:6,
		response_mac:48;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
	__be32	nonce;
} __packed;

struct amt_header_membership_update {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	u64	type:4,
		version:4,
		reserved:8,
		response_mac:48;
#elif defined(__BIG_ENDIAN_BITFIELD)
	u64	version:4,
		type:4,
		reserved:8,
		response_mac:48;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
	__be32	nonce;
} __packed;

struct amt_header_mcast_data {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	u16	type:4,
		version:4,
		reserved:8;
#elif defined(__BIG_ENDIAN_BITFIELD)
	u16	version:4,
		type:4,
		reserved:8;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
} __packed;

struct amt_headers {
	union {
		struct amt_header_discovery discovery;
		struct amt_header_advertisement advertisement;
		struct amt_header_request request;
		struct amt_header_membership_query query;
		struct amt_header_membership_update update;
		struct amt_header_mcast_data data;
	};
} __packed;

struct amt_gw_headers {
	union {
		struct amt_header_discovery discovery;
		struct amt_header_request request;
		struct amt_header_membership_update update;
	};
} __packed;

struct amt_relay_headers {
	union {
		struct amt_header_advertisement advertisement;
		struct amt_header_membership_query query;
		struct amt_header_mcast_data data;
	};
} __packed;

struct amt_skb_cb {
	struct amt_tunnel_list *tunnel;
};

struct amt_tunnel_list {
	struct list_head	list;
	/* Protect All resources under an amt_tunne_list */
	spinlock_t		lock;
	struct amt_dev		*amt;
	u32			nr_groups;
	u32			nr_sources;
	enum amt_status		status;
	struct delayed_work	gc_wq;
	__be16			source_port;
	__be32			ip4;
	__be32			nonce;
	siphash_key_t		key;
	u64			mac:48,
				reserved:16;
	struct rcu_head		rcu;
	struct hlist_head	groups[];
};

union amt_addr {
	__be32			ip4;
#if IS_ENABLED(CONFIG_IPV6)
	struct in6_addr		ip6;
#endif
};

/* RFC 3810
 *
 * When the router is in EXCLUDE mode, the router state is represented
 * by the notation EXCLUDE (X,Y), where X is called the "Requested List"
 * and Y is called the "Exclude List".  All sources, except those from
 * the Exclude List, will be forwarded by the router
 */
enum amt_source_status {
	AMT_SOURCE_STATUS_NONE,
	/* Node of Requested List */
	AMT_SOURCE_STATUS_FWD,
	/* Node of Exclude List */
	AMT_SOURCE_STATUS_D_FWD,
};

/* protected by gnode->lock */
struct amt_source_node {
	struct hlist_node	node;
	struct amt_group_node	*gnode;
	struct delayed_work     source_timer;
	union amt_addr		source_addr;
	enum amt_source_status	status;
#define AMT_SOURCE_OLD	0
#define AMT_SOURCE_NEW	1
	u8			flags;
	struct rcu_head		rcu;
};

/* Protected by amt_tunnel_list->lock */
struct amt_group_node {
	struct amt_dev		*amt;
	union amt_addr		group_addr;
	union amt_addr		host_addr;
	bool			v6;
	u8			filter_mode;
	u32			nr_sources;
	struct amt_tunnel_list	*tunnel_list;
	struct hlist_node	node;
	struct delayed_work     group_timer;
	struct rcu_head		rcu;
	struct hlist_head	sources[];
};

#define AMT_MAX_EVENTS	16
struct amt_events {
	enum amt_event event;
	struct sk_buff *skb;
};

struct amt_dev {
	struct net_device       *dev;
	struct net_device       *stream_dev;
	struct net		*net;
	/* Global lock for amt device */
	spinlock_t		lock;
	/* Used only in relay mode */
	struct list_head        tunnel_list;
	struct gro_cells	gro_cells;

	/* Protected by RTNL */
	struct delayed_work     discovery_wq;
	/* Protected by RTNL */
	struct delayed_work     req_wq;
	/* Protected by RTNL */
	struct delayed_work     secret_wq;
	struct work_struct	event_wq;
	/* AMT status */
	enum amt_status		status;
	/* Generated key */
	siphash_key_t		key;
	struct socket	  __rcu *sock;
	u32			max_groups;
	u32			max_sources;
	u32			hash_buckets;
	u32			hash_seed;
	/* Default 128 */
	u32                     max_tunnels;
	/* Default 128 */
	u32                     nr_tunnels;
	/* Gateway or Relay mode */
	u32                     mode;
	/* Default 2268 */
	__be16			relay_port;
	/* Default 2268 */
	__be16			gw_port;
	/* Outer local ip */
	__be32			local_ip;
	/* Outer remote ip */
	__be32			remote_ip;
	/* Outer discovery ip */
	__be32			discovery_ip;
	/* Only used in gateway mode */
	__be32			nonce;
	/* Gateway sent request and received query */
	bool			ready4;
	bool			ready6;
	u8			req_cnt;
	u8			qi;
	u64			qrv;
	u64			qri;
	/* Used only in gateway mode */
	u64			mac:48,
				reserved:16;
	/* AMT gateway side message handler queue */
	struct amt_events	events[AMT_MAX_EVENTS];
	u8			event_idx;
	u8			nr_events;
};

#define AMT_TOS			0xc0
#define AMT_IPHDR_OPTS		4
#define AMT_IP6HDR_OPTS		8
#define AMT_GC_INTERVAL		(30 * 1000)
#define AMT_MAX_GROUP		32
#define AMT_MAX_SOURCE		128
#define AMT_HSIZE_SHIFT		8
#define AMT_HSIZE		(1 << AMT_HSIZE_SHIFT)

#define AMT_DISCOVERY_TIMEOUT	5000
#define AMT_INIT_REQ_TIMEOUT	1
#define AMT_INIT_QUERY_INTERVAL	125
#define AMT_MAX_REQ_TIMEOUT	120
#define AMT_MAX_REQ_COUNT	3
#define AMT_SECRET_TIMEOUT	60000
#define IANA_AMT_UDP_PORT	2268
#define AMT_MAX_TUNNELS         128
#define AMT_MAX_REQS		128
#define AMT_GW_HLEN (sizeof(struct iphdr) + \
		     sizeof(struct udphdr) + \
		     sizeof(struct amt_gw_headers))
#define AMT_RELAY_HLEN (sizeof(struct iphdr) + \
		     sizeof(struct udphdr) + \
		     sizeof(struct amt_relay_headers))

static inline bool netif_is_amt(const struct net_device *dev)
{
	return dev->rtnl_link_ops && !strcmp(dev->rtnl_link_ops->kind, "amt");
}

static inline u64 amt_gmi(const struct amt_dev *amt)
{
	return ((amt->qrv * amt->qi) + amt->qri) * 1000;
}

#endif /* _NET_AMT_H_ */