netfilter: ipv6: add IPSKB_REROUTED exclusion to NF_HOOK/POSTROUTING invocation
[linux-2.6.git] / include / linux / ipv6.h
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
19 struct in6_pktinfo {
20         struct in6_addr ipi6_addr;
21         int             ipi6_ifindex;
22 };
23
24
25 struct in6_ifreq {
26         struct in6_addr ifr6_addr;
27         __u32           ifr6_prefixlen;
28         int             ifr6_ifindex; 
29 };
30
31 #define IPV6_SRCRT_STRICT       0x01    /* Deprecated; will be removed */
32 #define IPV6_SRCRT_TYPE_0       0       /* Deprecated; will be removed */
33 #define IPV6_SRCRT_TYPE_2       2       /* IPv6 type 2 Routing Header   */
34
35 /*
36  *      routing header
37  */
38 struct ipv6_rt_hdr {
39         __u8            nexthdr;
40         __u8            hdrlen;
41         __u8            type;
42         __u8            segments_left;
43
44         /*
45          *      type specific data
46          *      variable length field
47          */
48 };
49
50
51 struct ipv6_opt_hdr {
52         __u8            nexthdr;
53         __u8            hdrlen;
54         /* 
55          * TLV encoded option data follows.
56          */
57 } __attribute__ ((packed));     /* required for some archs */
58
59 #define ipv6_destopt_hdr ipv6_opt_hdr
60 #define ipv6_hopopt_hdr  ipv6_opt_hdr
61
62 #ifdef __KERNEL__
63 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
64 #endif
65
66 /*
67  *      routing header type 0 (used in cmsghdr struct)
68  */
69
70 struct rt0_hdr {
71         struct ipv6_rt_hdr      rt_hdr;
72         __u32                   reserved;
73         struct in6_addr         addr[0];
74
75 #define rt0_type                rt_hdr.type
76 };
77
78 /*
79  *      routing header type 2
80  */
81
82 struct rt2_hdr {
83         struct ipv6_rt_hdr      rt_hdr;
84         __u32                   reserved;
85         struct in6_addr         addr;
86
87 #define rt2_type                rt_hdr.type
88 };
89
90 /*
91  *      home address option in destination options header
92  */
93
94 struct ipv6_destopt_hao {
95         __u8                    type;
96         __u8                    length;
97         struct in6_addr         addr;
98 } __attribute__ ((__packed__));
99
100 /*
101  *      IPv6 fixed header
102  *
103  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
104  *      are glued to priority now, forming "class".
105  */
106
107 struct ipv6hdr {
108 #if defined(__LITTLE_ENDIAN_BITFIELD)
109         __u8                    priority:4,
110                                 version:4;
111 #elif defined(__BIG_ENDIAN_BITFIELD)
112         __u8                    version:4,
113                                 priority:4;
114 #else
115 #error  "Please fix <asm/byteorder.h>"
116 #endif
117         __u8                    flow_lbl[3];
118
119         __be16                  payload_len;
120         __u8                    nexthdr;
121         __u8                    hop_limit;
122
123         struct  in6_addr        saddr;
124         struct  in6_addr        daddr;
125 };
126
127 #ifdef __KERNEL__
128 /*
129  * This structure contains configuration options per IPv6 link.
130  */
131 struct ipv6_devconf {
132         __s32           forwarding;
133         __s32           hop_limit;
134         __s32           mtu6;
135         __s32           accept_ra;
136         __s32           accept_redirects;
137         __s32           autoconf;
138         __s32           dad_transmits;
139         __s32           rtr_solicits;
140         __s32           rtr_solicit_interval;
141         __s32           rtr_solicit_delay;
142         __s32           force_mld_version;
143 #ifdef CONFIG_IPV6_PRIVACY
144         __s32           use_tempaddr;
145         __s32           temp_valid_lft;
146         __s32           temp_prefered_lft;
147         __s32           regen_max_retry;
148         __s32           max_desync_factor;
149 #endif
150         __s32           max_addresses;
151         __s32           accept_ra_defrtr;
152         __s32           accept_ra_pinfo;
153 #ifdef CONFIG_IPV6_ROUTER_PREF
154         __s32           accept_ra_rtr_pref;
155         __s32           rtr_probe_interval;
156 #ifdef CONFIG_IPV6_ROUTE_INFO
157         __s32           accept_ra_rt_info_max_plen;
158 #endif
159 #endif
160         __s32           proxy_ndp;
161         __s32           accept_source_route;
162 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
163         __s32           optimistic_dad;
164 #endif
165 #ifdef CONFIG_IPV6_MROUTE
166         __s32           mc_forwarding;
167 #endif
168         __s32           disable_ipv6;
169         __s32           accept_dad;
170         __s32           force_tllao;
171         void            *sysctl;
172 };
173
174 struct ipv6_params {
175         __s32 disable_ipv6;
176         __s32 autoconf;
177 };
178 extern struct ipv6_params ipv6_defaults;
179 #endif
180
181 /* index values for the variables in ipv6_devconf */
182 enum {
183         DEVCONF_FORWARDING = 0,
184         DEVCONF_HOPLIMIT,
185         DEVCONF_MTU6,
186         DEVCONF_ACCEPT_RA,
187         DEVCONF_ACCEPT_REDIRECTS,
188         DEVCONF_AUTOCONF,
189         DEVCONF_DAD_TRANSMITS,
190         DEVCONF_RTR_SOLICITS,
191         DEVCONF_RTR_SOLICIT_INTERVAL,
192         DEVCONF_RTR_SOLICIT_DELAY,
193         DEVCONF_USE_TEMPADDR,
194         DEVCONF_TEMP_VALID_LFT,
195         DEVCONF_TEMP_PREFERED_LFT,
196         DEVCONF_REGEN_MAX_RETRY,
197         DEVCONF_MAX_DESYNC_FACTOR,
198         DEVCONF_MAX_ADDRESSES,
199         DEVCONF_FORCE_MLD_VERSION,
200         DEVCONF_ACCEPT_RA_DEFRTR,
201         DEVCONF_ACCEPT_RA_PINFO,
202         DEVCONF_ACCEPT_RA_RTR_PREF,
203         DEVCONF_RTR_PROBE_INTERVAL,
204         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
205         DEVCONF_PROXY_NDP,
206         DEVCONF_OPTIMISTIC_DAD,
207         DEVCONF_ACCEPT_SOURCE_ROUTE,
208         DEVCONF_MC_FORWARDING,
209         DEVCONF_DISABLE_IPV6,
210         DEVCONF_ACCEPT_DAD,
211         DEVCONF_FORCE_TLLAO,
212         DEVCONF_MAX
213 };
214
215 #ifdef __KERNEL__
216 #include <linux/icmpv6.h>
217 #include <linux/tcp.h>
218 #include <linux/udp.h>
219
220 #include <net/inet_sock.h>
221
222 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
223 {
224         return (struct ipv6hdr *)skb_network_header(skb);
225 }
226
227 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
228 {
229         return (struct ipv6hdr *)skb_transport_header(skb);
230 }
231
232 /* 
233    This structure contains results of exthdrs parsing
234    as offsets from skb->nh.
235  */
236
237 struct inet6_skb_parm {
238         int                     iif;
239         __u16                   ra;
240         __u16                   hop;
241         __u16                   dst0;
242         __u16                   srcrt;
243         __u16                   dst1;
244         __u16                   lastopt;
245         __u32                   nhoff;
246         __u16                   flags;
247 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
248         __u16                   dsthao;
249 #endif
250
251 #define IP6SKB_XFRM_TRANSFORMED 1
252 #define IP6SKB_FORWARDED        2
253 #define IP6SKB_REROUTED         4
254 };
255
256 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
257
258 static inline int inet6_iif(const struct sk_buff *skb)
259 {
260         return IP6CB(skb)->iif;
261 }
262
263 struct inet6_request_sock {
264         struct in6_addr         loc_addr;
265         struct in6_addr         rmt_addr;
266         struct sk_buff          *pktopts;
267         int                     iif;
268 };
269
270 struct tcp6_request_sock {
271         struct tcp_request_sock   tcp6rsk_tcp;
272         struct inet6_request_sock tcp6rsk_inet6;
273 };
274
275 struct ipv6_mc_socklist;
276 struct ipv6_ac_socklist;
277 struct ipv6_fl_socklist;
278
279 /**
280  * struct ipv6_pinfo - ipv6 private area
281  *
282  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
283  * this _must_ be the last member, so that inet6_sk_generic
284  * is able to calculate its offset from the base struct sock
285  * by using the struct proto->slab_obj_size member. -acme
286  */
287 struct ipv6_pinfo {
288         struct in6_addr         saddr;
289         struct in6_addr         rcv_saddr;
290         struct in6_addr         daddr;
291         struct in6_pktinfo      sticky_pktinfo;
292         struct in6_addr         *daddr_cache;
293 #ifdef CONFIG_IPV6_SUBTREES
294         struct in6_addr         *saddr_cache;
295 #endif
296
297         __be32                  flow_label;
298         __u32                   frag_size;
299
300         /*
301          * Packed in 16bits.
302          * Omit one shift by by putting the signed field at MSB.
303          */
304 #if defined(__BIG_ENDIAN_BITFIELD)
305         __s16                   hop_limit:9;
306         __u16                   __unused_1:7;
307 #else
308         __u16                   __unused_1:7;
309         __s16                   hop_limit:9;
310 #endif
311
312 #if defined(__BIG_ENDIAN_BITFIELD)
313         /* Packed in 16bits. */
314         __s16                   mcast_hops:9;
315         __u16                   __unused_2:6,
316                                 mc_loop:1;
317 #else
318         __u16                   mc_loop:1,
319                                 __unused_2:6;
320         __s16                   mcast_hops:9;
321 #endif
322         int                     mcast_oif;
323
324         /* pktoption flags */
325         union {
326                 struct {
327                         __u16   srcrt:1,
328                                 osrcrt:1,
329                                 rxinfo:1,
330                                 rxoinfo:1,
331                                 rxhlim:1,
332                                 rxohlim:1,
333                                 hopopts:1,
334                                 ohopopts:1,
335                                 dstopts:1,
336                                 odstopts:1,
337                                 rxflow:1,
338                                 rxtclass:1;
339                 } bits;
340                 __u16           all;
341         } rxopt;
342
343         /* sockopt flags */
344         __u8                    recverr:1,
345                                 sndflow:1,
346                                 pmtudisc:2,
347                                 ipv6only:1,
348                                 srcprefs:3;     /* 001: prefer temporary address
349                                                  * 010: prefer public address
350                                                  * 100: prefer care-of address
351                                                  */
352         __u8                    tclass;
353
354         __u32                   dst_cookie;
355
356         struct ipv6_mc_socklist *ipv6_mc_list;
357         struct ipv6_ac_socklist *ipv6_ac_list;
358         struct ipv6_fl_socklist *ipv6_fl_list;
359
360         struct ipv6_txoptions   *opt;
361         struct sk_buff          *pktoptions;
362         struct {
363                 struct ipv6_txoptions *opt;
364                 u8 hop_limit;
365                 u8 tclass;
366         } cork;
367 };
368
369 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
370 struct raw6_sock {
371         /* inet_sock has to be the first member of raw6_sock */
372         struct inet_sock        inet;
373         __u32                   checksum;       /* perform checksum */
374         __u32                   offset;         /* checksum offset  */
375         struct icmp6_filter     filter;
376         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
377         struct ipv6_pinfo       inet6;
378 };
379
380 struct udp6_sock {
381         struct udp_sock   udp;
382         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
383         struct ipv6_pinfo inet6;
384 };
385
386 struct tcp6_sock {
387         struct tcp_sock   tcp;
388         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
389         struct ipv6_pinfo inet6;
390 };
391
392 extern int inet6_sk_rebuild_header(struct sock *sk);
393
394 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
395 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
396 {
397         return inet_sk(__sk)->pinet6;
398 }
399
400 static inline struct inet6_request_sock *
401                         inet6_rsk(const struct request_sock *rsk)
402 {
403         return (struct inet6_request_sock *)(((u8 *)rsk) +
404                                              inet_rsk(rsk)->inet6_rsk_offset);
405 }
406
407 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
408 {
409         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
410 }
411
412 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
413 {
414         struct request_sock *req = reqsk_alloc(ops);
415
416         if (req != NULL) {
417                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
418                 inet6_rsk(req)->pktopts = NULL;
419         }
420
421         return req;
422 }
423
424 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
425 {
426         return (struct raw6_sock *)sk;
427 }
428
429 static inline void inet_sk_copy_descendant(struct sock *sk_to,
430                                            const struct sock *sk_from)
431 {
432         int ancestor_size = sizeof(struct inet_sock);
433
434         if (sk_from->sk_family == PF_INET6)
435                 ancestor_size += sizeof(struct ipv6_pinfo);
436
437         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
438 }
439
440 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
441 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
442
443 struct inet6_timewait_sock {
444         struct in6_addr tw_v6_daddr;
445         struct in6_addr tw_v6_rcv_saddr;
446 };
447
448 struct tcp6_timewait_sock {
449         struct tcp_timewait_sock   tcp6tw_tcp;
450         struct inet6_timewait_sock tcp6tw_inet6;
451 };
452
453 static inline u16 inet6_tw_offset(const struct proto *prot)
454 {
455         return prot->twsk_prot->twsk_obj_size -
456                         sizeof(struct inet6_timewait_sock);
457 }
458
459 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
460 {
461         return (struct inet6_timewait_sock *)(((u8 *)sk) +
462                                               inet_twsk(sk)->tw_ipv6_offset);
463 }
464
465 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
466 {
467         return likely(sk->sk_state != TCP_TIME_WAIT) ?
468                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
469 }
470
471 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
472 {
473         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
474 }
475
476 static inline int inet_v6_ipv6only(const struct sock *sk)
477 {
478         return likely(sk->sk_state != TCP_TIME_WAIT) ?
479                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
480 }
481 #else
482 #define __ipv6_only_sock(sk)    0
483 #define ipv6_only_sock(sk)      0
484
485 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
486 {
487         return NULL;
488 }
489
490 static inline struct inet6_request_sock *
491                         inet6_rsk(const struct request_sock *rsk)
492 {
493         return NULL;
494 }
495
496 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
497 {
498         return NULL;
499 }
500
501 #define __inet6_rcv_saddr(__sk) NULL
502 #define inet6_rcv_saddr(__sk)   NULL
503 #define tcp_twsk_ipv6only(__sk)         0
504 #define inet_v6_ipv6only(__sk)          0
505 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
506
507 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
508         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
509          ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
510          ((__sk)->sk_family             == AF_INET6)            && \
511          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
512          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
513          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
514
515 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
516         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
517          (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))   && \
518          ((__sk)->sk_family            == PF_INET6)                     && \
519          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))   && \
520          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
521          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
522
523 #endif /* __KERNEL__ */
524
525 #endif /* _IPV6_H */