1#ifndef _IPV6_H
2#define _IPV6_H
3
4#include <linux/types.h>
5#include <linux/in6.h>
6#include <asm/byteorder.h>
7
8/* The latest drafts declared increase in minimal mtu up to 1280. */
9
10#define IPV6_MIN_MTU	1280
11
12/*
13 *	Advanced API
14 *	source interface/address selection, source routing, etc...
15 *	*under construction*
16 */
17
18
19struct in6_pktinfo {
20	struct in6_addr	ipi6_addr;
21	int		ipi6_ifindex;
22};
23
24struct ip6_mtuinfo {
25	struct sockaddr_in6	ip6m_addr;
26	__u32			ip6m_mtu;
27};
28
29struct in6_ifreq {
30	struct in6_addr	ifr6_addr;
31	__u32		ifr6_prefixlen;
32	int		ifr6_ifindex;
33};
34
35#define IPV6_SRCRT_STRICT	0x01	/* Deprecated; will be removed */
36#define IPV6_SRCRT_TYPE_0	0	/* Deprecated; will be removed */
37#define IPV6_SRCRT_TYPE_2	2	/* IPv6 type 2 Routing Header	*/
38
39/*
40 *	routing header
41 */
42struct ipv6_rt_hdr {
43	__u8		nexthdr;
44	__u8		hdrlen;
45	__u8		type;
46	__u8		segments_left;
47
48	/*
49	 *	type specific data
50	 *	variable length field
51	 */
52};
53
54
55struct ipv6_opt_hdr {
56	__u8 		nexthdr;
57	__u8 		hdrlen;
58	/*
59	 * TLV encoded option data follows.
60	 */
61} __attribute__((packed));	/* required for some archs */
62
63#define ipv6_destopt_hdr ipv6_opt_hdr
64#define ipv6_hopopt_hdr  ipv6_opt_hdr
65
66#ifdef __KERNEL__
67#define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
68#endif
69
70/*
71 *	routing header type 0 (used in cmsghdr struct)
72 */
73
74struct rt0_hdr {
75	struct ipv6_rt_hdr	rt_hdr;
76	__u32			reserved;
77	struct in6_addr		addr[0];
78
79#define rt0_type		rt_hdr.type
80};
81
82/*
83 *	routing header type 2
84 */
85
86struct rt2_hdr {
87	struct ipv6_rt_hdr	rt_hdr;
88	__u32			reserved;
89	struct in6_addr		addr;
90
91#define rt2_type		rt_hdr.type
92};
93
94/*
95 *	home address option in destination options header
96 */
97
98struct ipv6_destopt_hao {
99	__u8			type;
100	__u8			length;
101	struct in6_addr		addr;
102} __attribute__((packed));
103
104/*
105 *	IPv6 fixed header
106 *
107 *	BEWARE, it is incorrect. The first 4 bits of flow_lbl
108 *	are glued to priority now, forming "class".
109 */
110
111struct ipv6hdr {
112#if defined(__LITTLE_ENDIAN_BITFIELD)
113	__u8			priority:4,
114				version:4;
115#elif defined(__BIG_ENDIAN_BITFIELD)
116	__u8			version:4,
117				priority:4;
118#else
119#error	"Please fix <asm/byteorder.h>"
120#endif
121	__u8			flow_lbl[3];
122
123	__be16			payload_len;
124	__u8			nexthdr;
125	__u8			hop_limit;
126
127	struct	in6_addr	saddr;
128	struct	in6_addr	daddr;
129};
130
131#ifdef __KERNEL__
132/*
133 * This structure contains configuration options per IPv6 link.
134 */
135struct ipv6_devconf {
136	__s32		forwarding;
137	__s32		hop_limit;
138	__s32		mtu6;
139	__s32		accept_ra;
140	__s32		accept_redirects;
141	__s32		autoconf;
142	__s32		dad_transmits;
143	__s32		rtr_solicits;
144	__s32		rtr_solicit_interval;
145	__s32		rtr_solicit_delay;
146	__s32		force_mld_version;
147#ifdef CONFIG_IPV6_PRIVACY
148	__s32		use_tempaddr;
149	__s32		temp_valid_lft;
150	__s32		temp_prefered_lft;
151	__s32		regen_max_retry;
152	__s32		max_desync_factor;
153#endif
154	__s32		max_addresses;
155	__s32		accept_ra_defrtr;
156	__s32		accept_ra_pinfo;
157#ifdef CONFIG_IPV6_ROUTER_PREF
158	__s32		accept_ra_rtr_pref;
159	__s32		rtr_probe_interval;
160#ifdef CONFIG_IPV6_ROUTE_INFO
161	__s32		accept_ra_rt_info_max_plen;
162#endif
163#endif
164	__s32		proxy_ndp;
165	__s32		accept_source_route;
166#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
167	__s32		optimistic_dad;
168#endif
169#ifdef CONFIG_IPV6_MROUTE
170	__s32		mc_forwarding;
171#endif
172	__s32		disable_ipv6;
173	__s32		accept_dad;
174	__s32		force_tllao;
175	void		*sysctl;
176};
177
178struct ipv6_params {
179	__s32 disable_ipv6;
180	__s32 autoconf;
181};
182extern struct ipv6_params ipv6_defaults;
183#endif
184
185/* index values for the variables in ipv6_devconf */
186enum {
187	DEVCONF_FORWARDING = 0,
188	DEVCONF_HOPLIMIT,
189	DEVCONF_MTU6,
190	DEVCONF_ACCEPT_RA,
191	DEVCONF_ACCEPT_REDIRECTS,
192	DEVCONF_AUTOCONF,
193	DEVCONF_DAD_TRANSMITS,
194	DEVCONF_RTR_SOLICITS,
195	DEVCONF_RTR_SOLICIT_INTERVAL,
196	DEVCONF_RTR_SOLICIT_DELAY,
197	DEVCONF_USE_TEMPADDR,
198	DEVCONF_TEMP_VALID_LFT,
199	DEVCONF_TEMP_PREFERED_LFT,
200	DEVCONF_REGEN_MAX_RETRY,
201	DEVCONF_MAX_DESYNC_FACTOR,
202	DEVCONF_MAX_ADDRESSES,
203	DEVCONF_FORCE_MLD_VERSION,
204	DEVCONF_ACCEPT_RA_DEFRTR,
205	DEVCONF_ACCEPT_RA_PINFO,
206	DEVCONF_ACCEPT_RA_RTR_PREF,
207	DEVCONF_RTR_PROBE_INTERVAL,
208	DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
209	DEVCONF_PROXY_NDP,
210	DEVCONF_OPTIMISTIC_DAD,
211	DEVCONF_ACCEPT_SOURCE_ROUTE,
212	DEVCONF_MC_FORWARDING,
213	DEVCONF_DISABLE_IPV6,
214	DEVCONF_ACCEPT_DAD,
215	DEVCONF_FORCE_TLLAO,
216	DEVCONF_MAX
217};
218
219#ifdef __KERNEL__
220#include <linux/icmpv6.h>
221#include <linux/tcp.h>
222#include <linux/udp.h>
223
224#include <net/inet_sock.h>
225
226static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
227{
228	return (struct ipv6hdr *)skb_network_header(skb);
229}
230
231static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
232{
233	return (struct ipv6hdr *)skb_transport_header(skb);
234}
235
236/*
237   This structure contains results of exthdrs parsing
238   as offsets from skb->nh.
239 */
240
241struct inet6_skb_parm {
242	int			iif;
243	__u16			ra;
244	__u16			hop;
245	__u16			dst0;
246	__u16			srcrt;
247	__u16			dst1;
248	__u16			lastopt;
249	__u16			nhoff;
250	__u16			flags;
251#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
252	__u16			dsthao;
253#endif
254
255#define IP6SKB_XFRM_TRANSFORMED	1
256#define IP6SKB_FORWARDED	2
257#define IP6SKB_REROUTED		4
258};
259
260#define IP6CB(skb)	((struct inet6_skb_parm*)((skb)->cb))
261#define IP6CBMTU(skb)	((struct ip6_mtuinfo *)((skb)->cb))
262
263static inline int inet6_iif(const struct sk_buff *skb)
264{
265	return IP6CB(skb)->iif;
266}
267
268struct inet6_request_sock {
269	struct in6_addr		loc_addr;
270	struct in6_addr		rmt_addr;
271	struct sk_buff		*pktopts;
272	int			iif;
273};
274
275struct tcp6_request_sock {
276	struct tcp_request_sock	  tcp6rsk_tcp;
277	struct inet6_request_sock tcp6rsk_inet6;
278};
279
280struct ipv6_mc_socklist;
281struct ipv6_ac_socklist;
282struct ipv6_fl_socklist;
283
284/**
285 * struct ipv6_pinfo - ipv6 private area
286 *
287 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
288 * this _must_ be the last member, so that inet6_sk_generic
289 * is able to calculate its offset from the base struct sock
290 * by using the struct proto->slab_obj_size member. -acme
291 */
292struct ipv6_pinfo {
293	struct in6_addr 	saddr;
294	struct in6_addr 	rcv_saddr;
295	struct in6_addr		daddr;
296	struct in6_pktinfo	sticky_pktinfo;
297	struct in6_addr		*daddr_cache;
298#ifdef CONFIG_IPV6_SUBTREES
299	struct in6_addr		*saddr_cache;
300#endif
301
302	__be32			flow_label;
303	__u32			frag_size;
304
305	/*
306	 * Packed in 16bits.
307	 * Omit one shift by by putting the signed field at MSB.
308	 */
309#if defined(__BIG_ENDIAN_BITFIELD)
310	__s16			hop_limit:9;
311	__u16			__unused_1:7;
312#else
313	__u16			__unused_1:7;
314	__s16			hop_limit:9;
315#endif
316
317#if defined(__BIG_ENDIAN_BITFIELD)
318	/* Packed in 16bits. */
319	__s16			mcast_hops:9;
320	__u16			__unused_2:6,
321				mc_loop:1;
322#else
323	__u16			mc_loop:1,
324				__unused_2:6;
325	__s16			mcast_hops:9;
326#endif
327	int			mcast_oif;
328
329	/* pktoption flags */
330	union {
331		struct {
332			__u16	srcrt:1,
333				osrcrt:1,
334			        rxinfo:1,
335			        rxoinfo:1,
336				rxhlim:1,
337				rxohlim:1,
338				hopopts:1,
339				ohopopts:1,
340				dstopts:1,
341				odstopts:1,
342                                rxflow:1,
343				rxtclass:1,
344				rxpmtu:1,
345				rxorigdstaddr:1;
346				/* 2 bits hole */
347		} bits;
348		__u16		all;
349	} rxopt;
350
351	/* sockopt flags */
352	__u16			recverr:1,
353	                        sndflow:1,
354				pmtudisc:2,
355				ipv6only:1,
356				srcprefs:3,	/* 001: prefer temporary address
357						 * 010: prefer public address
358						 * 100: prefer care-of address
359						 */
360				dontfrag:1;
361	__u8			min_hopcount;
362	__u8			tclass;
363	__u8			padding;
364
365	__u32			dst_cookie;
366
367	struct ipv6_mc_socklist	*ipv6_mc_list;
368	struct ipv6_ac_socklist	*ipv6_ac_list;
369	struct ipv6_fl_socklist *ipv6_fl_list;
370
371	struct ipv6_txoptions	*opt;
372	struct sk_buff		*pktoptions;
373	struct sk_buff		*rxpmtu;
374	struct {
375		struct ipv6_txoptions *opt;
376		u8 hop_limit;
377		u8 tclass;
378	} cork;
379};
380
381/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
382struct raw6_sock {
383	/* inet_sock has to be the first member of raw6_sock */
384	struct inet_sock	inet;
385	__u32			checksum;	/* perform checksum */
386	__u32			offset;		/* checksum offset  */
387	struct icmp6_filter	filter;
388	__u32			ip6mr_table;
389	/* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
390	struct ipv6_pinfo	inet6;
391};
392
393struct udp6_sock {
394	struct udp_sock	  udp;
395	/* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
396	struct ipv6_pinfo inet6;
397};
398
399struct tcp6_sock {
400	struct tcp_sock	  tcp;
401	/* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
402	struct ipv6_pinfo inet6;
403};
404
405extern int inet6_sk_rebuild_header(struct sock *sk);
406
407#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
408static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
409{
410	return inet_sk(__sk)->pinet6;
411}
412
413static inline struct inet6_request_sock *
414			inet6_rsk(const struct request_sock *rsk)
415{
416	return (struct inet6_request_sock *)(((u8 *)rsk) +
417					     inet_rsk(rsk)->inet6_rsk_offset);
418}
419
420static inline u32 inet6_rsk_offset(struct request_sock *rsk)
421{
422	return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
423}
424
425static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
426{
427	struct request_sock *req = reqsk_alloc(ops);
428
429	if (req != NULL) {
430		inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
431		inet6_rsk(req)->pktopts = NULL;
432	}
433
434	return req;
435}
436
437static inline struct raw6_sock *raw6_sk(const struct sock *sk)
438{
439	return (struct raw6_sock *)sk;
440}
441
442static inline void inet_sk_copy_descendant(struct sock *sk_to,
443					   const struct sock *sk_from)
444{
445	int ancestor_size = sizeof(struct inet_sock);
446
447	if (sk_from->sk_family == PF_INET6)
448		ancestor_size += sizeof(struct ipv6_pinfo);
449
450	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
451}
452
453#define __ipv6_only_sock(sk)	(inet6_sk(sk)->ipv6only)
454#define ipv6_only_sock(sk)	((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
455
456struct inet6_timewait_sock {
457	struct in6_addr tw_v6_daddr;
458	struct in6_addr	tw_v6_rcv_saddr;
459};
460
461struct tcp6_timewait_sock {
462	struct tcp_timewait_sock   tcp6tw_tcp;
463	struct inet6_timewait_sock tcp6tw_inet6;
464};
465
466static inline u16 inet6_tw_offset(const struct proto *prot)
467{
468	return prot->twsk_prot->twsk_obj_size -
469			sizeof(struct inet6_timewait_sock);
470}
471
472static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
473{
474	return (struct inet6_timewait_sock *)(((u8 *)sk) +
475					      inet_twsk(sk)->tw_ipv6_offset);
476}
477
478static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
479{
480	return likely(sk->sk_state != TCP_TIME_WAIT) ?
481		&inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
482}
483
484static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
485{
486	return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
487}
488
489static inline int inet_v6_ipv6only(const struct sock *sk)
490{
491	return likely(sk->sk_state != TCP_TIME_WAIT) ?
492		ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
493}
494#else
495#define __ipv6_only_sock(sk)	0
496#define ipv6_only_sock(sk)	0
497
498static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
499{
500	return NULL;
501}
502
503static inline struct inet6_request_sock *
504			inet6_rsk(const struct request_sock *rsk)
505{
506	return NULL;
507}
508
509static inline struct raw6_sock *raw6_sk(const struct sock *sk)
510{
511	return NULL;
512}
513
514#define __inet6_rcv_saddr(__sk)	NULL
515#define inet6_rcv_saddr(__sk)	NULL
516#define tcp_twsk_ipv6only(__sk)		0
517#define inet_v6_ipv6only(__sk)		0
518#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
519
520#define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
521	(((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)	&& \
522	 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
523	 ((__sk)->sk_family		== AF_INET6)		&& \
524	 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))	&& \
525	 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr))	&& \
526	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
527
528#define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
529	(((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)	&& \
530	 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))	&& \
531	 ((__sk)->sk_family	       == PF_INET6)			&& \
532	 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))	&& \
533	 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
534	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
535
536#endif /* __KERNEL__ */
537
538#endif /* _IPV6_H */
539