summaryrefslogtreecommitdiff
path: root/include/linux/ipv6.h
blob: 5e605e384aac815edebe293c02ae3e3a06f94ea4 (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
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _IPV6_H
#define _IPV6_H

#include <uapi/linux/ipv6.h>

#define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
#define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
/*
 * This structure contains configuration options per IPv6 link.
 */
struct ipv6_devconf {
	__s32		forwarding;
	__s32		hop_limit;
	__s32		mtu6;
	__s32		accept_ra;
	__s32		accept_redirects;
	__s32		autoconf;
	__s32		dad_transmits;
	__s32		rtr_solicits;
	__s32		rtr_solicit_interval;
	__s32		rtr_solicit_max_interval;
	__s32		rtr_solicit_delay;
	__s32		force_mld_version;
	__s32		mldv1_unsolicited_report_interval;
	__s32		mldv2_unsolicited_report_interval;
	__s32		use_tempaddr;
	__s32		temp_valid_lft;
	__s32		temp_prefered_lft;
	__s32		regen_max_retry;
	__s32		max_desync_factor;
	__s32		max_addresses;
	__s32		accept_ra_defrtr;
	__u32		ra_defrtr_metric;
	__s32		accept_ra_min_hop_limit;
	__s32		accept_ra_min_lft;
	__s32		accept_ra_pinfo;
	__s32		ignore_routes_with_linkdown;
#ifdef CONFIG_IPV6_ROUTER_PREF
	__s32		accept_ra_rtr_pref;
	__s32		rtr_probe_interval;
#ifdef CONFIG_IPV6_ROUTE_INFO
	__s32		accept_ra_rt_info_min_plen;
	__s32		accept_ra_rt_info_max_plen;
#endif
#endif
	__s32		proxy_ndp;
	__s32		accept_source_route;
	__s32		accept_ra_from_local;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
	__s32		optimistic_dad;
	__s32		use_optimistic;
#endif
#ifdef CONFIG_IPV6_MROUTE
	atomic_t	mc_forwarding;
#endif
	__s32		disable_ipv6;
	__s32		drop_unicast_in_l2_multicast;
	__s32		accept_dad;
	__s32		force_tllao;
	__s32           ndisc_notify;
	__s32		suppress_frag_ndisc;
	__s32		accept_ra_mtu;
	__s32		drop_unsolicited_na;
	__s32		accept_untracked_na;
	struct ipv6_stable_secret {
		bool initialized;
		struct in6_addr secret;
	} stable_secret;
	__s32		use_oif_addrs_only;
	__s32		keep_addr_on_down;
	__s32		seg6_enabled;
#ifdef CONFIG_IPV6_SEG6_HMAC
	__s32		seg6_require_hmac;
#endif
	__u32		enhanced_dad;
	__u32		addr_gen_mode;
	__s32		disable_policy;
	__s32           ndisc_tclass;
	__s32		rpl_seg_enabled;
	__u32		ioam6_id;
	__u32		ioam6_id_wide;
	__u8		ioam6_enabled;
	__u8		ndisc_evict_nocarrier;
	__u8		ra_honor_pio_life;

	struct ctl_table_header *sysctl_header;
};

struct ipv6_params {
	__s32 disable_ipv6;
	__s32 autoconf;
};
extern struct ipv6_params ipv6_defaults;
#include <linux/tcp.h>
#include <linux/udp.h>

#include <net/inet_sock.h>

static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
{
	return (struct ipv6hdr *)skb_network_header(skb);
}

static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
{
	return (struct ipv6hdr *)skb_inner_network_header(skb);
}

static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
{
	return (struct ipv6hdr *)skb_transport_header(skb);
}

static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
{
	return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
	       skb_network_header_len(skb);
}

/* 
   This structure contains results of exthdrs parsing
   as offsets from skb->nh.
 */

struct inet6_skb_parm {
	int			iif;
	__be16			ra;
	__u16			dst0;
	__u16			srcrt;
	__u16			dst1;
	__u16			lastopt;
	__u16			nhoff;
	__u16			flags;
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
	__u16			dsthao;
#endif
	__u16			frag_max_size;
	__u16			srhoff;

#define IP6SKB_XFRM_TRANSFORMED	1
#define IP6SKB_FORWARDED	2
#define IP6SKB_REROUTED		4
#define IP6SKB_ROUTERALERT	8
#define IP6SKB_FRAGMENTED      16
#define IP6SKB_HOPBYHOP        32
#define IP6SKB_L3SLAVE         64
#define IP6SKB_JUMBOGRAM      128
#define IP6SKB_SEG6	      256
#define IP6SKB_FAKEJUMBO      512
#define IP6SKB_MULTIPATH      1024
};

#if defined(CONFIG_NET_L3_MASTER_DEV)
static inline bool ipv6_l3mdev_skb(__u16 flags)
{
	return flags & IP6SKB_L3SLAVE;
}
#else
static inline bool ipv6_l3mdev_skb(__u16 flags)
{
	return false;
}
#endif

#define IP6CB(skb)	((struct inet6_skb_parm*)((skb)->cb))
#define IP6CBMTU(skb)	((struct ip6_mtuinfo *)((skb)->cb))

static inline int inet6_iif(const struct sk_buff *skb)
{
	bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);

	return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
}

static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
{
	return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
}

/* can not be used in TCP layer after tcp_v6_fill_cb */
static inline int inet6_sdif(const struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
	if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
		return IP6CB(skb)->iif;
#endif
	return 0;
}

struct tcp6_request_sock {
	struct tcp_request_sock	  tcp6rsk_tcp;
};

struct ipv6_mc_socklist;
struct ipv6_ac_socklist;
struct ipv6_fl_socklist;

struct inet6_cork {
	struct ipv6_txoptions *opt;
	u8 hop_limit;
	u8 tclass;
};

/* struct ipv6_pinfo - ipv6 private area */
struct ipv6_pinfo {
	struct in6_addr 	saddr;
	struct in6_pktinfo	sticky_pktinfo;
	const struct in6_addr		*daddr_cache;
#ifdef CONFIG_IPV6_SUBTREES
	const struct in6_addr		*saddr_cache;
#endif

	__be32			flow_label;
	__u32			frag_size;

	s16			hop_limit;
	u8			mcast_hops;

	int			ucast_oif;
	int			mcast_oif;

	/* pktoption flags */
	union {
		struct {
			__u16	srcrt:1,
				osrcrt:1,
			        rxinfo:1,
			        rxoinfo:1,
				rxhlim:1,
				rxohlim:1,
				hopopts:1,
				ohopopts:1,
				dstopts:1,
				odstopts:1,
                                rxflow:1,
				rxtclass:1,
				rxpmtu:1,
				rxorigdstaddr:1,
				recvfragsize:1;
				/* 1 bits hole */
		} bits;
		__u16		all;
	} rxopt;

	/* sockopt flags */
	__u8			srcprefs;	/* 001: prefer temporary address
						 * 010: prefer public address
						 * 100: prefer care-of address
						 */
	__u8			pmtudisc;
	__u8			min_hopcount;
	__u8			tclass;
	__be32			rcv_flowinfo;

	__u32			dst_cookie;

	struct ipv6_mc_socklist	__rcu *ipv6_mc_list;
	struct ipv6_ac_socklist	*ipv6_ac_list;
	struct ipv6_fl_socklist __rcu *ipv6_fl_list;

	struct ipv6_txoptions __rcu	*opt;
	struct sk_buff		*pktoptions;
	struct sk_buff		*rxpmtu;
	struct inet6_cork	cork;
};

/* We currently use available bits from inet_sk(sk)->inet_flags,
 * this could change in the future.
 */
#define inet6_test_bit(nr, sk)			\
	test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
#define inet6_set_bit(nr, sk)			\
	set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
#define inet6_clear_bit(nr, sk)			\
	clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
#define inet6_assign_bit(nr, sk, val)		\
	assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val)

/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
struct raw6_sock {
	/* inet_sock has to be the first member of raw6_sock */
	struct inet_sock	inet;
	__u32			checksum;	/* perform checksum */
	__u32			offset;		/* checksum offset  */
	struct icmp6_filter	filter;
	__u32			ip6mr_table;

	struct ipv6_pinfo	inet6;
};

struct udp6_sock {
	struct udp_sock	  udp;

	struct ipv6_pinfo inet6;
};

struct tcp6_sock {
	struct tcp_sock	  tcp;

	struct ipv6_pinfo inet6;
};

extern int inet6_sk_rebuild_header(struct sock *sk);

struct tcp6_timewait_sock {
	struct tcp_timewait_sock   tcp6tw_tcp;
};

#if IS_ENABLED(CONFIG_IPV6)
bool ipv6_mod_enabled(void);

static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
{
	return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
}

#define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk)

#define ipv6_only_sock(sk)	(sk->sk_ipv6only)
#define ipv6_sk_rxinfo(sk)	((sk)->sk_family == PF_INET6 && \
				 inet6_sk(sk)->rxopt.bits.rxinfo)

static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
{
	if (sk->sk_family == AF_INET6)
		return &sk->sk_v6_rcv_saddr;
	return NULL;
}

static inline int inet_v6_ipv6only(const struct sock *sk)
{
	/* ipv6only field is at same position for timewait and other sockets */
	return ipv6_only_sock(sk);
}
#else
#define ipv6_only_sock(sk)	0
#define ipv6_sk_rxinfo(sk)	0

static inline bool ipv6_mod_enabled(void)
{
	return false;
}

static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
{
	return NULL;
}

static inline struct raw6_sock *raw6_sk(const struct sock *sk)
{
	return NULL;
}

#define inet6_rcv_saddr(__sk)	NULL
#define inet_v6_ipv6only(__sk)		0
#endif /* IS_ENABLED(CONFIG_IPV6) */
#endif /* _IPV6_H */