c9ba0da16ce96526ad665d311c4c1a856580c2e5
[linux-3.10.git] / include / linux / ipv6.h
1 #ifndef _IPV6_H
2 #define _IPV6_H
3
4 #include <linux/in6.h>
5 #include <asm/byteorder.h>
6
7 /* The latest drafts declared increase in minimal mtu up to 1280. */
8
9 #define IPV6_MIN_MTU    1280
10
11 /*
12  *      Advanced API
13  *      source interface/address selection, source routing, etc...
14  *      *under construction*
15  */
16
17
18 struct in6_pktinfo {
19         struct in6_addr ipi6_addr;
20         int             ipi6_ifindex;
21 };
22
23
24 struct in6_ifreq {
25         struct in6_addr ifr6_addr;
26         __u32           ifr6_prefixlen;
27         int             ifr6_ifindex; 
28 };
29
30 #define IPV6_SRCRT_STRICT       0x01    /* Deprecated; will be removed */
31 #define IPV6_SRCRT_TYPE_0       0       /* Deprecated; will be removed */
32 #define IPV6_SRCRT_TYPE_2       2       /* IPv6 type 2 Routing Header   */
33
34 /*
35  *      routing header
36  */
37 struct ipv6_rt_hdr {
38         __u8            nexthdr;
39         __u8            hdrlen;
40         __u8            type;
41         __u8            segments_left;
42
43         /*
44          *      type specific data
45          *      variable length field
46          */
47 };
48
49
50 struct ipv6_opt_hdr {
51         __u8            nexthdr;
52         __u8            hdrlen;
53         /* 
54          * TLV encoded option data follows.
55          */
56 };
57
58 #define ipv6_destopt_hdr ipv6_opt_hdr
59 #define ipv6_hopopt_hdr  ipv6_opt_hdr
60
61 #ifdef __KERNEL__
62 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
63 #endif
64
65 /*
66  *      routing header type 0 (used in cmsghdr struct)
67  */
68
69 struct rt0_hdr {
70         struct ipv6_rt_hdr      rt_hdr;
71         __u32                   reserved;
72         struct in6_addr         addr[0];
73
74 #define rt0_type                rt_hdr.type
75 };
76
77 /*
78  *      routing header type 2
79  */
80
81 struct rt2_hdr {
82         struct ipv6_rt_hdr      rt_hdr;
83         __u32                   reserved;
84         struct in6_addr         addr;
85
86 #define rt2_type                rt_hdr.type
87 };
88
89 /*
90  *      home address option in destination options header
91  */
92
93 struct ipv6_destopt_hao {
94         __u8                    type;
95         __u8                    length;
96         struct in6_addr         addr;
97 } __attribute__ ((__packed__));
98
99 /*
100  *      IPv6 fixed header
101  *
102  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
103  *      are glued to priority now, forming "class".
104  */
105
106 struct ipv6hdr {
107 #if defined(__LITTLE_ENDIAN_BITFIELD)
108         __u8                    priority:4,
109                                 version:4;
110 #elif defined(__BIG_ENDIAN_BITFIELD)
111         __u8                    version:4,
112                                 priority:4;
113 #else
114 #error  "Please fix <asm/byteorder.h>"
115 #endif
116         __u8                    flow_lbl[3];
117
118         __be16                  payload_len;
119         __u8                    nexthdr;
120         __u8                    hop_limit;
121
122         struct  in6_addr        saddr;
123         struct  in6_addr        daddr;
124 };
125
126 /*
127  * This structure contains configuration options per IPv6 link.
128  */
129 struct ipv6_devconf {
130         __s32           forwarding;
131         __s32           hop_limit;
132         __s32           mtu6;
133         __s32           accept_ra;
134         __s32           accept_redirects;
135         __s32           autoconf;
136         __s32           dad_transmits;
137         __s32           rtr_solicits;
138         __s32           rtr_solicit_interval;
139         __s32           rtr_solicit_delay;
140         __s32           force_mld_version;
141 #ifdef CONFIG_IPV6_PRIVACY
142         __s32           use_tempaddr;
143         __s32           temp_valid_lft;
144         __s32           temp_prefered_lft;
145         __s32           regen_max_retry;
146         __s32           max_desync_factor;
147 #endif
148         __s32           max_addresses;
149         __s32           accept_ra_defrtr;
150         __s32           accept_ra_pinfo;
151 #ifdef CONFIG_IPV6_ROUTER_PREF
152         __s32           accept_ra_rtr_pref;
153         __s32           rtr_probe_interval;
154 #ifdef CONFIG_IPV6_ROUTE_INFO
155         __s32           accept_ra_rt_info_max_plen;
156 #endif
157 #endif
158         __s32           proxy_ndp;
159         __s32           accept_source_route;
160 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
161         __s32           optimistic_dad;
162 #endif
163         void            *sysctl;
164 };
165
166 /* index values for the variables in ipv6_devconf */
167 enum {
168         DEVCONF_FORWARDING = 0,
169         DEVCONF_HOPLIMIT,
170         DEVCONF_MTU6,
171         DEVCONF_ACCEPT_RA,
172         DEVCONF_ACCEPT_REDIRECTS,
173         DEVCONF_AUTOCONF,
174         DEVCONF_DAD_TRANSMITS,
175         DEVCONF_RTR_SOLICITS,
176         DEVCONF_RTR_SOLICIT_INTERVAL,
177         DEVCONF_RTR_SOLICIT_DELAY,
178         DEVCONF_USE_TEMPADDR,
179         DEVCONF_TEMP_VALID_LFT,
180         DEVCONF_TEMP_PREFERED_LFT,
181         DEVCONF_REGEN_MAX_RETRY,
182         DEVCONF_MAX_DESYNC_FACTOR,
183         DEVCONF_MAX_ADDRESSES,
184         DEVCONF_FORCE_MLD_VERSION,
185         DEVCONF_ACCEPT_RA_DEFRTR,
186         DEVCONF_ACCEPT_RA_PINFO,
187         DEVCONF_ACCEPT_RA_RTR_PREF,
188         DEVCONF_RTR_PROBE_INTERVAL,
189         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
190         DEVCONF_PROXY_NDP,
191         DEVCONF_OPTIMISTIC_DAD,
192         DEVCONF_ACCEPT_SOURCE_ROUTE,
193         DEVCONF_MAX
194 };
195
196 #ifdef __KERNEL__
197 #include <linux/icmpv6.h>
198 #include <linux/tcp.h>
199 #include <linux/udp.h>
200
201 #include <net/inet_sock.h>
202
203 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
204 {
205         return (struct ipv6hdr *)skb_network_header(skb);
206 }
207
208 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
209 {
210         return (struct ipv6hdr *)skb_transport_header(skb);
211 }
212
213 /* 
214    This structure contains results of exthdrs parsing
215    as offsets from skb->nh.
216  */
217
218 struct inet6_skb_parm {
219         int                     iif;
220         __u16                   ra;
221         __u16                   hop;
222         __u16                   dst0;
223         __u16                   srcrt;
224         __u16                   dst1;
225         __u16                   lastopt;
226         __u32                   nhoff;
227         __u16                   flags;
228 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
229         __u16                   dsthao;
230 #endif
231
232 #define IP6SKB_XFRM_TRANSFORMED 1
233 };
234
235 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
236
237 static inline int inet6_iif(const struct sk_buff *skb)
238 {
239         return IP6CB(skb)->iif;
240 }
241
242 struct inet6_request_sock {
243         struct in6_addr         loc_addr;
244         struct in6_addr         rmt_addr;
245         struct sk_buff          *pktopts;
246         int                     iif;
247 };
248
249 struct tcp6_request_sock {
250         struct tcp_request_sock   tcp6rsk_tcp;
251         struct inet6_request_sock tcp6rsk_inet6;
252 };
253
254 struct ipv6_mc_socklist;
255 struct ipv6_ac_socklist;
256 struct ipv6_fl_socklist;
257
258 /**
259  * struct ipv6_pinfo - ipv6 private area
260  *
261  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
262  * this _must_ be the last member, so that inet6_sk_generic
263  * is able to calculate its offset from the base struct sock
264  * by using the struct proto->slab_obj_size member. -acme
265  */
266 struct ipv6_pinfo {
267         struct in6_addr         saddr;
268         struct in6_addr         rcv_saddr;
269         struct in6_addr         daddr;
270         struct in6_addr         *daddr_cache;
271 #ifdef CONFIG_IPV6_SUBTREES
272         struct in6_addr         *saddr_cache;
273 #endif
274
275         __be32                  flow_label;
276         __u32                   frag_size;
277
278         /*
279          * Packed in 16bits.
280          * Omit one shift by by putting the signed field at MSB.
281          */
282 #if defined(__BIG_ENDIAN_BITFIELD)
283         __s16                   hop_limit:9;
284         __u16                   __unused_1:7;
285 #else
286         __u16                   __unused_1:7;
287         __s16                   hop_limit:9;
288 #endif
289
290 #if defined(__BIG_ENDIAN_BITFIELD)
291         /* Packed in 16bits. */
292         __s16                   mcast_hops:9;
293         __u16                   __unused_2:6,
294                                 mc_loop:1;
295 #else
296         __u16                   mc_loop:1,
297                                 __unused_2:6;
298         __s16                   mcast_hops:9;
299 #endif
300         int                     mcast_oif;
301
302         /* pktoption flags */
303         union {
304                 struct {
305                         __u16   srcrt:1,
306                                 osrcrt:1,
307                                 rxinfo:1,
308                                 rxoinfo:1,
309                                 rxhlim:1,
310                                 rxohlim:1,
311                                 hopopts:1,
312                                 ohopopts:1,
313                                 dstopts:1,
314                                 odstopts:1,
315                                 rxflow:1,
316                                 rxtclass:1;
317                 } bits;
318                 __u16           all;
319         } rxopt;
320
321         /* sockopt flags */
322         __u8                    recverr:1,
323                                 sndflow:1,
324                                 pmtudisc:2,
325                                 ipv6only:1,
326                                 srcprefs:3;     /* 001: prefer temporary address
327                                                  * 010: prefer public address
328                                                  * 100: prefer care-of address
329                                                  */
330         __u8                    tclass;
331
332         __u32                   dst_cookie;
333
334         struct ipv6_mc_socklist *ipv6_mc_list;
335         struct ipv6_ac_socklist *ipv6_ac_list;
336         struct ipv6_fl_socklist *ipv6_fl_list;
337
338         struct ipv6_txoptions   *opt;
339         struct sk_buff          *pktoptions;
340         struct {
341                 struct ipv6_txoptions *opt;
342                 u8 hop_limit;
343                 u8 tclass;
344         } cork;
345 };
346
347 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
348 struct raw6_sock {
349         /* inet_sock has to be the first member of raw6_sock */
350         struct inet_sock        inet;
351         __u32                   checksum;       /* perform checksum */
352         __u32                   offset;         /* checksum offset  */
353         struct icmp6_filter     filter;
354         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
355         struct ipv6_pinfo       inet6;
356 };
357
358 struct udp6_sock {
359         struct udp_sock   udp;
360         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
361         struct ipv6_pinfo inet6;
362 };
363
364 struct tcp6_sock {
365         struct tcp_sock   tcp;
366         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
367         struct ipv6_pinfo inet6;
368 };
369
370 extern int inet6_sk_rebuild_header(struct sock *sk);
371
372 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
373 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
374 {
375         return inet_sk(__sk)->pinet6;
376 }
377
378 static inline struct inet6_request_sock *
379                         inet6_rsk(const struct request_sock *rsk)
380 {
381         return (struct inet6_request_sock *)(((u8 *)rsk) +
382                                              inet_rsk(rsk)->inet6_rsk_offset);
383 }
384
385 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
386 {
387         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
388 }
389
390 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
391 {
392         struct request_sock *req = reqsk_alloc(ops);
393
394         if (req != NULL)
395                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
396
397         return req;
398 }
399
400 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
401 {
402         return (struct raw6_sock *)sk;
403 }
404
405 static inline void inet_sk_copy_descendant(struct sock *sk_to,
406                                            const struct sock *sk_from)
407 {
408         int ancestor_size = sizeof(struct inet_sock);
409
410         if (sk_from->sk_family == PF_INET6)
411                 ancestor_size += sizeof(struct ipv6_pinfo);
412
413         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
414 }
415
416 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
417 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
418
419 struct inet6_timewait_sock {
420         struct in6_addr tw_v6_daddr;
421         struct in6_addr tw_v6_rcv_saddr;
422 };
423
424 struct tcp6_timewait_sock {
425         struct tcp_timewait_sock   tcp6tw_tcp;
426         struct inet6_timewait_sock tcp6tw_inet6;
427 };
428
429 static inline u16 inet6_tw_offset(const struct proto *prot)
430 {
431         return prot->twsk_prot->twsk_obj_size -
432                         sizeof(struct inet6_timewait_sock);
433 }
434
435 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
436 {
437         return (struct inet6_timewait_sock *)(((u8 *)sk) +
438                                               inet_twsk(sk)->tw_ipv6_offset);
439 }
440
441 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
442 {
443         return likely(sk->sk_state != TCP_TIME_WAIT) ?
444                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
445 }
446
447 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
448 {
449         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
450 }
451
452 static inline int inet_v6_ipv6only(const struct sock *sk)
453 {
454         return likely(sk->sk_state != TCP_TIME_WAIT) ?
455                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
456 }
457 #else
458 #define __ipv6_only_sock(sk)    0
459 #define ipv6_only_sock(sk)      0
460
461 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
462 {
463         return NULL;
464 }
465
466 static inline struct inet6_request_sock *
467                         inet6_rsk(const struct request_sock *rsk)
468 {
469         return NULL;
470 }
471
472 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
473 {
474         return NULL;
475 }
476
477 #define __inet6_rcv_saddr(__sk) NULL
478 #define inet6_rcv_saddr(__sk)   NULL
479 #define tcp_twsk_ipv6only(__sk)         0
480 #define inet_v6_ipv6only(__sk)          0
481 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
482
483 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
484         (((__sk)->sk_hash == (__hash)) && ((__sk)->sk_net == (__net))   && \
485          ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))      && \
486          ((__sk)->sk_family             == AF_INET6)            && \
487          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
488          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
489          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
490
491 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
492         (((__sk)->sk_hash == (__hash)) && ((__sk)->sk_net == (__net))   && \
493          (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))   && \
494          ((__sk)->sk_family            == PF_INET6)                     && \
495          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))   && \
496          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
497          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
498
499 #endif /* __KERNEL__ */
500
501 #endif /* _IPV6_H */