1#ifndef _IPV6_H
2#define _IPV6_H
3
4#include <uapi/linux/ipv6.h>
5
6#define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
7#define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
8/*
9 * This structure contains configuration options per IPv6 link.
10 */
11struct ipv6_devconf {
12	__s32		forwarding;
13	__s32		hop_limit;
14	__s32		mtu6;
15	__s32		accept_ra;
16	__s32		accept_redirects;
17	__s32		autoconf;
18	__s32		dad_transmits;
19	__s32		rtr_solicits;
20	__s32		rtr_solicit_interval;
21	__s32		rtr_solicit_delay;
22	__s32		force_mld_version;
23	__s32		mldv1_unsolicited_report_interval;
24	__s32		mldv2_unsolicited_report_interval;
25	__s32		use_tempaddr;
26	__s32		temp_valid_lft;
27	__s32		temp_prefered_lft;
28	__s32		regen_max_retry;
29	__s32		max_desync_factor;
30	__s32		max_addresses;
31	__s32		accept_ra_defrtr;
32	__s32		accept_ra_min_hop_limit;
33	__s32		accept_ra_pinfo;
34#ifdef CONFIG_IPV6_ROUTER_PREF
35	__s32		accept_ra_rtr_pref;
36	__s32		rtr_probe_interval;
37#ifdef CONFIG_IPV6_ROUTE_INFO
38	__s32		accept_ra_rt_info_max_plen;
39#endif
40#endif
41	__s32		proxy_ndp;
42	__s32		accept_source_route;
43	__s32		accept_ra_from_local;
44#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
45	__s32		optimistic_dad;
46	__s32		use_optimistic;
47#endif
48#ifdef CONFIG_IPV6_MROUTE
49	__s32		mc_forwarding;
50#endif
51	__s32		disable_ipv6;
52	__s32		accept_dad;
53	__s32		force_tllao;
54	__s32           ndisc_notify;
55	__s32		suppress_frag_ndisc;
56	__s32		accept_ra_mtu;
57	struct ipv6_stable_secret {
58		bool initialized;
59		struct in6_addr secret;
60	} stable_secret;
61	void		*sysctl;
62};
63
64struct ipv6_params {
65	__s32 disable_ipv6;
66	__s32 autoconf;
67};
68extern struct ipv6_params ipv6_defaults;
69#include <linux/icmpv6.h>
70#include <linux/tcp.h>
71#include <linux/udp.h>
72
73#include <net/inet_sock.h>
74
75static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
76{
77	return (struct ipv6hdr *)skb_network_header(skb);
78}
79
80static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
81{
82	return (struct ipv6hdr *)skb_inner_network_header(skb);
83}
84
85static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
86{
87	return (struct ipv6hdr *)skb_transport_header(skb);
88}
89
90/*
91   This structure contains results of exthdrs parsing
92   as offsets from skb->nh.
93 */
94
95struct inet6_skb_parm {
96	int			iif;
97	__be16			ra;
98	__u16			hop;
99	__u16			dst0;
100	__u16			srcrt;
101	__u16			dst1;
102	__u16			lastopt;
103	__u16			nhoff;
104	__u16			flags;
105#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
106	__u16			dsthao;
107#endif
108	__u16			frag_max_size;
109
110#define IP6SKB_XFRM_TRANSFORMED	1
111#define IP6SKB_FORWARDED	2
112#define IP6SKB_REROUTED		4
113#define IP6SKB_ROUTERALERT	8
114#define IP6SKB_FRAGMENTED      16
115};
116
117#define IP6CB(skb)	((struct inet6_skb_parm*)((skb)->cb))
118#define IP6CBMTU(skb)	((struct ip6_mtuinfo *)((skb)->cb))
119
120static inline int inet6_iif(const struct sk_buff *skb)
121{
122	return IP6CB(skb)->iif;
123}
124
125struct tcp6_request_sock {
126	struct tcp_request_sock	  tcp6rsk_tcp;
127};
128
129struct ipv6_mc_socklist;
130struct ipv6_ac_socklist;
131struct ipv6_fl_socklist;
132
133struct inet6_cork {
134	struct ipv6_txoptions *opt;
135	u8 hop_limit;
136	u8 tclass;
137};
138
139/**
140 * struct ipv6_pinfo - ipv6 private area
141 *
142 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
143 * this _must_ be the last member, so that inet6_sk_generic
144 * is able to calculate its offset from the base struct sock
145 * by using the struct proto->slab_obj_size member. -acme
146 */
147struct ipv6_pinfo {
148	struct in6_addr 	saddr;
149	struct in6_pktinfo	sticky_pktinfo;
150	const struct in6_addr		*daddr_cache;
151#ifdef CONFIG_IPV6_SUBTREES
152	const struct in6_addr		*saddr_cache;
153#endif
154
155	__be32			flow_label;
156	__u32			frag_size;
157
158	/*
159	 * Packed in 16bits.
160	 * Omit one shift by by putting the signed field at MSB.
161	 */
162#if defined(__BIG_ENDIAN_BITFIELD)
163	__s16			hop_limit:9;
164	__u16			__unused_1:7;
165#else
166	__u16			__unused_1:7;
167	__s16			hop_limit:9;
168#endif
169
170#if defined(__BIG_ENDIAN_BITFIELD)
171	/* Packed in 16bits. */
172	__s16			mcast_hops:9;
173	__u16			__unused_2:6,
174				mc_loop:1;
175#else
176	__u16			mc_loop:1,
177				__unused_2:6;
178	__s16			mcast_hops:9;
179#endif
180	int			ucast_oif;
181	int			mcast_oif;
182
183	/* pktoption flags */
184	union {
185		struct {
186			__u16	srcrt:1,
187				osrcrt:1,
188			        rxinfo:1,
189			        rxoinfo:1,
190				rxhlim:1,
191				rxohlim:1,
192				hopopts:1,
193				ohopopts:1,
194				dstopts:1,
195				odstopts:1,
196                                rxflow:1,
197				rxtclass:1,
198				rxpmtu:1,
199				rxorigdstaddr:1;
200				/* 2 bits hole */
201		} bits;
202		__u16		all;
203	} rxopt;
204
205	/* sockopt flags */
206	__u16			recverr:1,
207	                        sndflow:1,
208				repflow:1,
209				pmtudisc:3,
210				padding:1,	/* 1 bit hole */
211				srcprefs:3,	/* 001: prefer temporary address
212						 * 010: prefer public address
213						 * 100: prefer care-of address
214						 */
215				dontfrag:1,
216				autoflowlabel:1;
217	__u8			min_hopcount;
218	__u8			tclass;
219	__be32			rcv_flowinfo;
220
221	__u32			dst_cookie;
222	__u32			rx_dst_cookie;
223
224	struct ipv6_mc_socklist	__rcu *ipv6_mc_list;
225	struct ipv6_ac_socklist	*ipv6_ac_list;
226	struct ipv6_fl_socklist __rcu *ipv6_fl_list;
227
228	struct ipv6_txoptions __rcu	*opt;
229	struct sk_buff		*pktoptions;
230	struct sk_buff		*rxpmtu;
231	struct inet6_cork	cork;
232};
233
234/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
235struct raw6_sock {
236	/* inet_sock has to be the first member of raw6_sock */
237	struct inet_sock	inet;
238	__u32			checksum;	/* perform checksum */
239	__u32			offset;		/* checksum offset  */
240	struct icmp6_filter	filter;
241	__u32			ip6mr_table;
242	/* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
243	struct ipv6_pinfo	inet6;
244};
245
246struct udp6_sock {
247	struct udp_sock	  udp;
248	/* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
249	struct ipv6_pinfo inet6;
250};
251
252struct tcp6_sock {
253	struct tcp_sock	  tcp;
254	/* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
255	struct ipv6_pinfo inet6;
256};
257
258extern int inet6_sk_rebuild_header(struct sock *sk);
259
260struct tcp6_timewait_sock {
261	struct tcp_timewait_sock   tcp6tw_tcp;
262};
263
264#if IS_ENABLED(CONFIG_IPV6)
265static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
266{
267	return inet_sk(__sk)->pinet6;
268}
269
270static inline struct raw6_sock *raw6_sk(const struct sock *sk)
271{
272	return (struct raw6_sock *)sk;
273}
274
275static inline void inet_sk_copy_descendant(struct sock *sk_to,
276					   const struct sock *sk_from)
277{
278	int ancestor_size = sizeof(struct inet_sock);
279
280	if (sk_from->sk_family == PF_INET6)
281		ancestor_size += sizeof(struct ipv6_pinfo);
282
283	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
284}
285
286#define __ipv6_only_sock(sk)	(sk->sk_ipv6only)
287#define ipv6_only_sock(sk)	(__ipv6_only_sock(sk))
288#define ipv6_sk_rxinfo(sk)	((sk)->sk_family == PF_INET6 && \
289				 inet6_sk(sk)->rxopt.bits.rxinfo)
290
291static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
292{
293	if (sk->sk_family == AF_INET6)
294		return &sk->sk_v6_rcv_saddr;
295	return NULL;
296}
297
298static inline int inet_v6_ipv6only(const struct sock *sk)
299{
300	/* ipv6only field is at same position for timewait and other sockets */
301	return ipv6_only_sock(sk);
302}
303#else
304#define __ipv6_only_sock(sk)	0
305#define ipv6_only_sock(sk)	0
306#define ipv6_sk_rxinfo(sk)	0
307
308static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
309{
310	return NULL;
311}
312
313static inline struct inet6_request_sock *
314			inet6_rsk(const struct request_sock *rsk)
315{
316	return NULL;
317}
318
319static inline struct raw6_sock *raw6_sk(const struct sock *sk)
320{
321	return NULL;
322}
323
324#define inet6_rcv_saddr(__sk)	NULL
325#define tcp_twsk_ipv6only(__sk)		0
326#define inet_v6_ipv6only(__sk)		0
327#endif /* IS_ENABLED(CONFIG_IPV6) */
328#endif /* _IPV6_H */
329