summaryrefslogtreecommitdiff
path: root/include/net6.h
blob: beafc0533860ce8f067d8d4abf807dcc6aa4c6ce (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
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (C) 2013 Allied Telesis Labs NZ
 * Chris Packham, <judge.packham@gmail.com>
 *
 * Copyright (C) 2022 YADRO
 * Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>
 */

#ifndef __NET6_H__
#define __NET6_H__

#include <net.h>
#include <linux/ctype.h>

/* struct in6_addr - 128 bits long IPv6 address */
struct in6_addr {
	union {
		u8	u6_addr8[16];
		__be16	u6_addr16[8];
		__be32	u6_addr32[4];
	} in6_u;

#define s6_addr		in6_u.u6_addr8
#define s6_addr16	in6_u.u6_addr16
#define s6_addr32	in6_u.u6_addr32
} __packed;

#define IN6ADDRSZ	sizeof(struct in6_addr)
#define INETHADDRSZ	sizeof(net_ethaddr)

#define PROT_IP6	0x86DD	/* IPv6 protocol */
#define PROT_ICMPV6	58	/* ICMPv6 protocol*/

#define IPV6_ADDRSCOPE_INTF	0x01
#define IPV6_ADDRSCOPE_LINK	0x02
#define IPV6_ADDRSCOPE_AMDIN	0x04
#define IPV6_ADDRSCOPE_SITE	0x05
#define IPV6_ADDRSCOPE_ORG	0x08
#define IPV6_ADDRSCOPE_GLOBAL	0x0E

#define USE_IP6_CMD_PARAM	"-ipv6"

/**
 * struct ipv6hdr - Internet Protocol V6 (IPv6) header.
 *
 * IPv6 packet header as defined in RFC 2460.
 */
struct ip6_hdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	u8	priority:4,
		version:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
	u8	version:4,
		priority:4;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
	u8		flow_lbl[3];
	__be16		payload_len;
	u8		nexthdr;
	u8		hop_limit;
	struct in6_addr	saddr;
	struct in6_addr	daddr;
} __packed;
#define IP6_HDR_SIZE (sizeof(struct ip6_hdr))

/* struct udp_hdr - User Datagram Protocol header */
struct udp_hdr {
	u16		udp_src;	/* UDP source port		*/
	u16		udp_dst;	/* UDP destination port		*/
	u16		udp_len;	/* Length of UDP packet		*/
	u16		udp_xsum;	/* Checksum			*/
} __packed;

/*
 * Handy for static initialisations of struct in6_addr, atlhough the
 * c99 '= { 0 }' idiom might work depending on you compiler.
 */
#define ZERO_IPV6_ADDR { { { 0x00, 0x00, 0x00, 0x00, \
			  0x00, 0x00, 0x00, 0x00, \
			  0x00, 0x00, 0x00, 0x00, \
			  0x00, 0x00, 0x00, 0x00 } } }
/*
 * All-routers multicast address is the link-local scope address to reach all
 * routers.
 */
#define ALL_ROUTERS_MULT_ADDR { { { 0xFF, 0x02, 0x00, 0x00, \
				  0x00, 0x00, 0x00, 0x00, \
				  0x00, 0x00, 0x00, 0x00, \
				  0x00, 0x00, 0x00, 0x02 } } }

#define IPV6_LINK_LOCAL_PREFIX	0xfe80
#define IPV6_LINK_LOCAL_MASK	0xffb0 /* The first 10-bit of address mask. */

/* hop limit for neighbour discovery packets */
#define IPV6_NDISC_HOPLIMIT             255
#define NDISC_TIMEOUT			5000UL
#define NDISC_TIMEOUT_COUNT             3

/* struct icmp6hdr - Internet Control Message Protocol header for IPV6 */
struct icmp6hdr {
	u8	icmp6_type;
#define IPV6_ICMP_ECHO_REQUEST			128
#define IPV6_ICMP_ECHO_REPLY			129
#define IPV6_NDISC_ROUTER_SOLICITATION		133
#define IPV6_NDISC_ROUTER_ADVERTISEMENT		134
#define IPV6_NDISC_NEIGHBOUR_SOLICITATION	135
#define IPV6_NDISC_NEIGHBOUR_ADVERTISEMENT	136
#define IPV6_NDISC_REDIRECT			137
	u8	icmp6_code;
	__be16	icmp6_cksum;

	/* ICMPv6 data */
	union {
		__be32	un_data32[1];
		__be16	un_data16[2];
		u8	un_data8[4];

		/* struct icmpv6_echo - echo request/reply message format */
		struct icmpv6_echo {
			__be16		identifier;
			__be16		sequence;
		} u_echo;

		/* struct icmpv6_nd_advt - Neighbor Advertisement format */
		struct icmpv6_nd_advt {
#if defined(__LITTLE_ENDIAN_BITFIELD)
			__be32		reserved:5,
					override:1,
					solicited:1,
					router:1,
					reserved2:24;
#elif defined(__BIG_ENDIAN_BITFIELD)
			__be32		router:1,
					solicited:1,
					override:1,
					reserved:29;
#else
#error	"Please fix <asm/byteorder.h>"
#endif
		} u_nd_advt;

		/* struct icmpv6_nd_ra - Router Advertisement format */
		struct icmpv6_nd_ra {
			u8		hop_limit;
#if defined(__LITTLE_ENDIAN_BITFIELD)
			u8		reserved:6,
					other:1,
					managed:1;

#elif defined(__BIG_ENDIAN_BITFIELD)
			u8		managed:1,
					other:1,
					reserved:6;
#else
#error	"Please fix <asm/byteorder.h>"
#endif
			__be16		rt_lifetime;
		} u_nd_ra;
	} icmp6_dataun;
#define icmp6_identifier	icmp6_dataun.u_echo.identifier
#define icmp6_sequence		icmp6_dataun.u_echo.sequence
#define icmp6_pointer		icmp6_dataun.un_data32[0]
#define icmp6_mtu		icmp6_dataun.un_data32[0]
#define icmp6_unused		icmp6_dataun.un_data32[0]
#define icmp6_maxdelay		icmp6_dataun.un_data16[0]
#define icmp6_router		icmp6_dataun.u_nd_advt.router
#define icmp6_solicited		icmp6_dataun.u_nd_advt.solicited
#define icmp6_override		icmp6_dataun.u_nd_advt.override
#define icmp6_ndiscreserved	icmp6_dataun.u_nd_advt.reserved
#define icmp6_hop_limit		icmp6_dataun.u_nd_ra.hop_limit
#define icmp6_addrconf_managed	icmp6_dataun.u_nd_ra.managed
#define icmp6_addrconf_other	icmp6_dataun.u_nd_ra.other
#define icmp6_rt_lifetime	icmp6_dataun.u_nd_ra.rt_lifetime
} __packed;

/*
 * struct icmp6_ra_prefix_info - Prefix Information option of the ICMPv6 message
 * The Prefix Information option provides hosts with on-link prefixes and
 * prefixes for Address Autoconfiguration. Refer to RFC 4861 for more info.
 */
struct icmp6_ra_prefix_info {
	u8	type;		/* Type is 3 for Prefix Information. */
	u8	len;		/* Len is 4 for Prefix Information. */
	/* The number of leading bits in the Prefix that are valid. */
	u8	prefix_len;
	u8	reserved1:6,	/* MUST be ignored by the receiver. */
		aac:1,		/* autonomous address-configuration flag */
	/* Indicates that this prefix can be used for on-link determination. */
		on_link:1;
	/*
	 * The length of time in seconds that the prefix is valid for the
	 * purpose of on-link determination.
	 */
	__be32	valid_lifetime;
	/* The length of time addresses remain preferred. */
	__be32	preferred_lifetime;
	__be32	reserved2;	/* MUST be ignored by the receiver. */
	/*
	 * Prefix is an IP address or a prefix of an IP address. The Prefix
	 * Length field contains the number of valid leading bits in the prefix.
	 * The bits in the prefix after the prefix length are reserved and MUST
	 * be initialized to zero by the sender and ignored by the receiver.
	 */
	struct in6_addr prefix;
};

extern struct in6_addr const net_null_addr_ip6;	/* NULL IPv6 address */
extern struct in6_addr net_gateway6;	/* Our gateways IPv6 address */
extern struct in6_addr net_ip6;	/* Our IPv6 addr (0 = unknown) */
extern struct in6_addr net_link_local_ip6;	/* Our link local IPv6 addr */
extern u32 net_prefix_length;	/* Our prefixlength (0 = unknown) */
extern struct in6_addr net_server_ip6;	/* Server IPv6 addr (0 = unknown) */
extern struct in6_addr net_ping_ip6; /* the ipv6 address to ping */
extern bool use_ip6;

#if IS_ENABLED(CONFIG_IPV6)
/**
 * string_to_ip6() - Convert IPv6 string addr to inner IPV6 addr format
 *
 * Examples of valid strings:
 *	2001:db8::0:1234:1
 *	2001:0db8:0000:0000:0000:0000:1234:0001
 *	::1
 *	::ffff:192.168.1.1
 *
 * Examples of invalid strings
 *	2001:db8::0::0          (:: can only appear once)
 *	2001:db8:192.168.1.1::1 (v4 part can only appear at the end)
 *	192.168.1.1             (we don't implicity map v4)
 *
 * @s:		IPv6 string addr format
 * @len:	IPv6 string addr length
 * @addr:	converted IPv6 addr
 * Return: 0 if conversion successful, -EINVAL if fail
 */
int string_to_ip6(const char *s, size_t len, struct in6_addr *addr);

/**
 * ip6_is_unspecified_addr() - Check if IPv6 addr is not set i.e. is zero
 *
 * @addr:	IPv6 addr
 * Return:  0 if addr is not set, -1 if is set
 */
int ip6_is_unspecified_addr(struct in6_addr *addr);

/**
 * ip6_is_our_addr() - Check if IPv6 addr belongs to our host addr
 *
 * We have 2 addresses that we should respond to. A link local address and a
 * global address. This returns true if the specified address matches either
 * of these.
 *
 * @addr:	addr to check
 * Return: 0 if addr is our, -1 otherwise
 */
int ip6_is_our_addr(struct in6_addr *addr);

/**
 * ip6_addr_in_subnet() - Check if two IPv6 addresses are in the same subnet
 *
 * @our_addr:		first IPv6 addr
 * @neigh_addr:		second IPv6 addr
 * @prefix_length:	network mask length
 * Return: 0 if two addresses in the same subnet, -1 otherwise
 */
int ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr,
		       u32 prefix_length);

/**
 * ip6_make_lladd() - rMake up IPv6 Link Local address
 *
 * @lladdr:	formed IPv6 Link Local address
 * @enetaddr:	MAC addr of a device
 */
void ip6_make_lladdr(struct in6_addr *lladr, unsigned char const enetaddr[6]);

/**
 * ip6_make_snma() - aMake up Solicited Node Multicast Address from IPv6 addr
 *
 * @mcast_addr:	formed SNMA addr
 * @ip6_addr:	base IPv6 addr
 */
void ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr);

/**
 * ip6_make_mult_ethdstaddr() - Make up IPv6 multicast addr
 *
 * @enetaddr:	MAC addr of a device
 * @mcast_addr:	formed IPv6 multicast addr
 */
void ip6_make_mult_ethdstaddr(unsigned char enetaddr[6],
			      struct in6_addr *mcast_addr);

/**
 * csum_partial() - Compute an internet checksum
 *
 * @buff:	buffer to be checksummed
 * @len:	length of buffer
 * @sum:	initial sum to be added in
 * Return: internet checksum of the buffer
 */
unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum);

/**
 * csum_ipv6_magic() - Compute checksum of IPv6 "psuedo-header" per RFC2460 section 8.1
 *
 * @saddr:	source IPv6 addr
 * @daddr:	destination IPv6 add
 * @len:	data length to be checksummed
 * @proto:	IPv6 above protocol code
 * @csum:	upper layer checksum
 * Return: computed checksum
 */
unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
				   struct in6_addr *daddr, u16 len,
				   unsigned short proto, unsigned int csum);

/**
 * ip6_add_hdr() - Make up IPv6 header
 *
 * @xip:	pointer to IPv6 header to be formed
 * @src:	source IPv6 addr
 * @dest:	destination IPv6 addr
 * @nextheader:	next header type
 * @hoplimit:	hop limit
 * @payload_len: payload length
 * Return: IPv6 header length
 */
int ip6_add_hdr(uchar *xip, struct in6_addr *src, struct in6_addr *dest,
		int nextheader, int hoplimit, int payload_len);

/**
 * net_send_udp_packet6() - Make up UDP packet and send it
 *
 * @ether:	destination MAC addr
 * @dest:	destination IPv6 addr
 * @dport:	destination port
 * @sport:	source port
 * @len:	UDP packet length
 * Return: 0 if send successfully, -1 otherwise
 */
int net_send_udp_packet6(uchar *ether, struct in6_addr *dest, int dport,
			 int sport, int len);

/**
 * net_ip6_handler() - Handle IPv6 packet
 *
 * @et:		pointer to the beginning of the packet
 * @ip6:	pointer to the beginning of IPv6 protocol
 * @len:	incoming packet len
 * Return: 0 if handle packet successfully, -EINVAL in case of invalid protocol
 */
int net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len);

/**
 * net_copy_ip6() - Copy IPv6 addr
 *
 * @to:		destination IPv6 addr
 * @from:	source IPv6 addr
 */
static inline void net_copy_ip6(void *to, const void *from)
{
	memcpy((void *)to, from, sizeof(struct in6_addr));
}
#else
static inline int
string_to_ip6(const char *s, size_t len, struct in6_addr *addr)
{
	return -EINVAL;
}

static inline int ip6_is_unspecified_addr(struct in6_addr *addr)
{
	return -1;
}

static inline int ip6_is_our_addr(struct in6_addr *addr)
{
	return -1;
}

static inline int
ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr,
		   u32 prefix_length)
{
	return -1;
}

static inline void
ip6_make_lladdr(struct in6_addr *lladdr, unsigned char const enetaddr[6])
{
}

static inline void
ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr)
{
}

static inline void
ip6_make_mult_ethdstaddr(unsigned char enetaddr[6],
			 struct in6_addr *mcast_addr)
{
}

static inline unsigned int
csum_partial(const unsigned char *buff, int len, unsigned int sum)
{
	return 0;
}

static inline unsigned short
csum_ipv6_magic(struct in6_addr *saddr,
		struct in6_addr *daddr, u16 len,
		unsigned short proto, unsigned int csum)
{
	return 0;
}

static inline unsigned int
ip6_add_hdr(uchar *xip, struct in6_addr *src, struct in6_addr *dest,
	    int nextheader, int hoplimit, int payload_len)
{
	return 0;
}

static inline int
net_send_udp_packet6(uchar *ether, struct in6_addr *dest,
		     int dport, int sport, int len)
{
	return -1;
}

static inline int
net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6,
		int len)
{
	return -EINVAL;
}

static inline void net_copy_ip6(void *to, const void *from)
{
}
#endif

#if IS_ENABLED(CONFIG_CMD_PING6)
/* Send ping requset */
void ping6_start(void);

/**
 * ping6_receive() - Handle reception of ICMPv6 echo request/reply
 *
 * @et:		pointer to incoming patcket
 * @ip6:	pointer to IPv6 protocol
 * @len:	packet length
 * Return: 0 if success, -EINVAL in case of failure during reception
 */
int ping6_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len);
#else
static inline void ping6_start(void)
{
}

static inline
int ping6_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len)
{
	return -EINVAL;
}
#endif /* CONFIG_CMD_PING6 */

#endif /* __NET6_H__ */