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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 } __attribute__ ((packed));     /* required for some archs */
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 #ifdef __KERNEL__
127 /*
128  * This structure contains configuration options per IPv6 link.
129  */
130 struct ipv6_devconf {
131         __s32           forwarding;
132         __s32           hop_limit;
133         __s32           mtu6;
134         __s32           accept_ra;
135         __s32           accept_redirects;
136         __s32           autoconf;
137         __s32           dad_transmits;
138         __s32           rtr_solicits;
139         __s32           rtr_solicit_interval;
140         __s32           rtr_solicit_delay;
141         __s32           force_mld_version;
142 #ifdef CONFIG_IPV6_PRIVACY
143         __s32           use_tempaddr;
144         __s32           temp_valid_lft;
145         __s32           temp_prefered_lft;
146         __s32           regen_max_retry;
147         __s32           max_desync_factor;
148 #endif
149         __s32           max_addresses;
150         __s32           accept_ra_defrtr;
151         __s32           accept_ra_pinfo;
152 #ifdef CONFIG_IPV6_ROUTER_PREF
153         __s32           accept_ra_rtr_pref;
154         __s32           rtr_probe_interval;
155 #ifdef CONFIG_IPV6_ROUTE_INFO
156         __s32           accept_ra_rt_info_max_plen;
157 #endif
158 #endif
159         __s32           proxy_ndp;
160         __s32           accept_source_route;
161 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
162         __s32           optimistic_dad;
163 #endif
164 #ifdef CONFIG_IPV6_MROUTE
165         __s32           mc_forwarding;
166 #endif
167         __s32           disable_ipv6;
168         __s32           accept_dad;
169         void            *sysctl;
170 };
171 #endif
172
173 /* index values for the variables in ipv6_devconf */
174 enum {
175         DEVCONF_FORWARDING = 0,
176         DEVCONF_HOPLIMIT,
177         DEVCONF_MTU6,
178         DEVCONF_ACCEPT_RA,
179         DEVCONF_ACCEPT_REDIRECTS,
180         DEVCONF_AUTOCONF,
181         DEVCONF_DAD_TRANSMITS,
182         DEVCONF_RTR_SOLICITS,
183         DEVCONF_RTR_SOLICIT_INTERVAL,
184         DEVCONF_RTR_SOLICIT_DELAY,
185         DEVCONF_USE_TEMPADDR,
186         DEVCONF_TEMP_VALID_LFT,
187         DEVCONF_TEMP_PREFERED_LFT,
188         DEVCONF_REGEN_MAX_RETRY,
189         DEVCONF_MAX_DESYNC_FACTOR,
190         DEVCONF_MAX_ADDRESSES,
191         DEVCONF_FORCE_MLD_VERSION,
192         DEVCONF_ACCEPT_RA_DEFRTR,
193         DEVCONF_ACCEPT_RA_PINFO,
194         DEVCONF_ACCEPT_RA_RTR_PREF,
195         DEVCONF_RTR_PROBE_INTERVAL,
196         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
197         DEVCONF_PROXY_NDP,
198         DEVCONF_OPTIMISTIC_DAD,
199         DEVCONF_ACCEPT_SOURCE_ROUTE,
200         DEVCONF_MC_FORWARDING,
201         DEVCONF_DISABLE_IPV6,
202         DEVCONF_ACCEPT_DAD,
203         DEVCONF_MAX
204 };
205
206 #ifdef __KERNEL__
207 #include <linux/icmpv6.h>
208 #include <linux/tcp.h>
209 #include <linux/udp.h>
210
211 #include <net/inet_sock.h>
212
213 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
214 {
215         return (struct ipv6hdr *)skb_network_header(skb);
216 }
217
218 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
219 {
220         return (struct ipv6hdr *)skb_transport_header(skb);
221 }
222
223 /* 
224    This structure contains results of exthdrs parsing
225    as offsets from skb->nh.
226  */
227
228 struct inet6_skb_parm {
229         int                     iif;
230         __u16                   ra;
231         __u16                   hop;
232         __u16                   dst0;
233         __u16                   srcrt;
234         __u16                   dst1;
235         __u16                   lastopt;
236         __u32                   nhoff;
237         __u16                   flags;
238 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
239         __u16                   dsthao;
240 #endif
241
242 #define IP6SKB_XFRM_TRANSFORMED 1
243 #define IP6SKB_FORWARDED        2
244 };
245
246 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
247
248 static inline int inet6_iif(const struct sk_buff *skb)
249 {
250         return IP6CB(skb)->iif;
251 }
252
253 struct inet6_request_sock {
254         struct in6_addr         loc_addr;
255         struct in6_addr         rmt_addr;
256         struct sk_buff          *pktopts;
257         int                     iif;
258 };
259
260 struct tcp6_request_sock {
261         struct tcp_request_sock   tcp6rsk_tcp;
262         struct inet6_request_sock tcp6rsk_inet6;
263 };
264
265 struct ipv6_mc_socklist;
266 struct ipv6_ac_socklist;
267 struct ipv6_fl_socklist;
268
269 /**
270  * struct ipv6_pinfo - ipv6 private area
271  *
272  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
273  * this _must_ be the last member, so that inet6_sk_generic
274  * is able to calculate its offset from the base struct sock
275  * by using the struct proto->slab_obj_size member. -acme
276  */
277 struct ipv6_pinfo {
278         struct in6_addr         saddr;
279         struct in6_addr         rcv_saddr;
280         struct in6_addr         daddr;
281         struct in6_pktinfo      sticky_pktinfo;
282         struct in6_addr         *daddr_cache;
283 #ifdef CONFIG_IPV6_SUBTREES
284         struct in6_addr         *saddr_cache;
285 #endif
286
287         __be32                  flow_label;
288         __u32                   frag_size;
289
290         /*
291          * Packed in 16bits.
292          * Omit one shift by by putting the signed field at MSB.
293          */
294 #if defined(__BIG_ENDIAN_BITFIELD)
295         __s16                   hop_limit:9;
296         __u16                   __unused_1:7;
297 #else
298         __u16                   __unused_1:7;
299         __s16                   hop_limit:9;
300 #endif
301
302 #if defined(__BIG_ENDIAN_BITFIELD)
303         /* Packed in 16bits. */
304         __s16                   mcast_hops:9;
305         __u16                   __unused_2:6,
306                                 mc_loop:1;
307 #else
308         __u16                   mc_loop:1,
309                                 __unused_2:6;
310         __s16                   mcast_hops:9;
311 #endif
312         int                     mcast_oif;
313
314         /* pktoption flags */
315         union {
316                 struct {
317                         __u16   srcrt:1,
318                                 osrcrt:1,
319                                 rxinfo:1,
320                                 rxoinfo:1,
321                                 rxhlim:1,
322                                 rxohlim:1,
323                                 hopopts:1,
324                                 ohopopts:1,
325                                 dstopts:1,
326                                 odstopts:1,
327                                 rxflow:1,
328                                 rxtclass:1;
329                 } bits;
330                 __u16           all;
331         } rxopt;
332
333         /* sockopt flags */
334         __u8                    recverr:1,
335                                 sndflow:1,
336                                 pmtudisc:2,
337                                 ipv6only:1,
338                                 srcprefs:3;     /* 001: prefer temporary address
339                                                  * 010: prefer public address
340                                                  * 100: prefer care-of address
341                                                  */
342         __u8                    tclass;
343
344         __u32                   dst_cookie;
345
346         struct ipv6_mc_socklist *ipv6_mc_list;
347         struct ipv6_ac_socklist *ipv6_ac_list;
348         struct ipv6_fl_socklist *ipv6_fl_list;
349
350         struct ipv6_txoptions   *opt;
351         struct sk_buff          *pktoptions;
352         struct {
353                 struct ipv6_txoptions *opt;
354                 u8 hop_limit;
355                 u8 tclass;
356         } cork;
357 };
358
359 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
360 struct raw6_sock {
361         /* inet_sock has to be the first member of raw6_sock */
362         struct inet_sock        inet;
363         __u32                   checksum;       /* perform checksum */
364         __u32                   offset;         /* checksum offset  */
365         struct icmp6_filter     filter;
366         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
367         struct ipv6_pinfo       inet6;
368 };
369
370 struct udp6_sock {
371         struct udp_sock   udp;
372         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
373         struct ipv6_pinfo inet6;
374 };
375
376 struct tcp6_sock {
377         struct tcp_sock   tcp;
378         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
379         struct ipv6_pinfo inet6;
380 };
381
382 extern int inet6_sk_rebuild_header(struct sock *sk);
383
384 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
385 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
386 {
387         return inet_sk(__sk)->pinet6;
388 }
389
390 static inline struct inet6_request_sock *
391                         inet6_rsk(const struct request_sock *rsk)
392 {
393         return (struct inet6_request_sock *)(((u8 *)rsk) +
394                                              inet_rsk(rsk)->inet6_rsk_offset);
395 }
396
397 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
398 {
399         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
400 }
401
402 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
403 {
404         struct request_sock *req = reqsk_alloc(ops);
405
406         if (req != NULL) {
407                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
408                 inet6_rsk(req)->pktopts = NULL;
409         }
410
411         return req;
412 }
413
414 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
415 {
416         return (struct raw6_sock *)sk;
417 }
418
419 static inline void inet_sk_copy_descendant(struct sock *sk_to,
420                                            const struct sock *sk_from)
421 {
422         int ancestor_size = sizeof(struct inet_sock);
423
424         if (sk_from->sk_family == PF_INET6)
425                 ancestor_size += sizeof(struct ipv6_pinfo);
426
427         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
428 }
429
430 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
431 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
432
433 struct inet6_timewait_sock {
434         struct in6_addr tw_v6_daddr;
435         struct in6_addr tw_v6_rcv_saddr;
436 };
437
438 struct tcp6_timewait_sock {
439         struct tcp_timewait_sock   tcp6tw_tcp;
440         struct inet6_timewait_sock tcp6tw_inet6;
441 };
442
443 static inline u16 inet6_tw_offset(const struct proto *prot)
444 {
445         return prot->twsk_prot->twsk_obj_size -
446                         sizeof(struct inet6_timewait_sock);
447 }
448
449 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
450 {
451         return (struct inet6_timewait_sock *)(((u8 *)sk) +
452                                               inet_twsk(sk)->tw_ipv6_offset);
453 }
454
455 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
456 {
457         return likely(sk->sk_state != TCP_TIME_WAIT) ?
458                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
459 }
460
461 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
462 {
463         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
464 }
465
466 static inline int inet_v6_ipv6only(const struct sock *sk)
467 {
468         return likely(sk->sk_state != TCP_TIME_WAIT) ?
469                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
470 }
471 #else
472 #define __ipv6_only_sock(sk)    0
473 #define ipv6_only_sock(sk)      0
474
475 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
476 {
477         return NULL;
478 }
479
480 static inline struct inet6_request_sock *
481                         inet6_rsk(const struct request_sock *rsk)
482 {
483         return NULL;
484 }
485
486 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
487 {
488         return NULL;
489 }
490
491 #define __inet6_rcv_saddr(__sk) NULL
492 #define inet6_rcv_saddr(__sk)   NULL
493 #define tcp_twsk_ipv6only(__sk)         0
494 #define inet_v6_ipv6only(__sk)          0
495 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
496
497 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
498         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
499          ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))      && \
500          ((__sk)->sk_family             == AF_INET6)            && \
501          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
502          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
503          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
504
505 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
506         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
507          (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))   && \
508          ((__sk)->sk_family            == PF_INET6)                     && \
509          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))   && \
510          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
511          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
512
513 #endif /* __KERNEL__ */
514
515 #endif /* _IPV6_H */