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