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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_MAX | |
212 | }; | |
213 | ||
214 | #ifdef __KERNEL__ | |
215 | #include <linux/icmpv6.h> | |
216 | #include <linux/tcp.h> | |
217 | #include <linux/udp.h> | |
218 | ||
219 | #include <net/inet_sock.h> | |
220 | ||
221 | static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) | |
222 | { | |
223 | return (struct ipv6hdr *)skb_network_header(skb); | |
224 | } | |
225 | ||
226 | static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) | |
227 | { | |
228 | return (struct ipv6hdr *)skb_transport_header(skb); | |
229 | } | |
230 | ||
231 | /* | |
232 | This structure contains results of exthdrs parsing | |
233 | as offsets from skb->nh. | |
234 | */ | |
235 | ||
236 | struct inet6_skb_parm { | |
237 | int iif; | |
238 | __u16 ra; | |
239 | __u16 hop; | |
240 | __u16 dst0; | |
241 | __u16 srcrt; | |
242 | __u16 dst1; | |
243 | __u16 lastopt; | |
244 | __u32 nhoff; | |
245 | __u16 flags; | |
246 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) | |
247 | __u16 dsthao; | |
248 | #endif | |
249 | ||
250 | #define IP6SKB_XFRM_TRANSFORMED 1 | |
251 | #define IP6SKB_FORWARDED 2 | |
252 | }; | |
253 | ||
254 | #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) | |
255 | ||
256 | static inline int inet6_iif(const struct sk_buff *skb) | |
257 | { | |
258 | return IP6CB(skb)->iif; | |
259 | } | |
260 | ||
261 | struct inet6_request_sock { | |
262 | struct in6_addr loc_addr; | |
263 | struct in6_addr rmt_addr; | |
264 | struct sk_buff *pktopts; | |
265 | int iif; | |
266 | }; | |
267 | ||
268 | struct tcp6_request_sock { | |
269 | struct tcp_request_sock tcp6rsk_tcp; | |
270 | struct inet6_request_sock tcp6rsk_inet6; | |
271 | }; | |
272 | ||
273 | struct ipv6_mc_socklist; | |
274 | struct ipv6_ac_socklist; | |
275 | struct ipv6_fl_socklist; | |
276 | ||
277 | /** | |
278 | * struct ipv6_pinfo - ipv6 private area | |
279 | * | |
280 | * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) | |
281 | * this _must_ be the last member, so that inet6_sk_generic | |
282 | * is able to calculate its offset from the base struct sock | |
283 | * by using the struct proto->slab_obj_size member. -acme | |
284 | */ | |
285 | struct ipv6_pinfo { | |
286 | struct in6_addr saddr; | |
287 | struct in6_addr rcv_saddr; | |
288 | struct in6_addr daddr; | |
289 | struct in6_pktinfo sticky_pktinfo; | |
290 | struct in6_addr *daddr_cache; | |
291 | #ifdef CONFIG_IPV6_SUBTREES | |
292 | struct in6_addr *saddr_cache; | |
293 | #endif | |
294 | ||
295 | __be32 flow_label; | |
296 | __u32 frag_size; | |
297 | ||
298 | /* | |
299 | * Packed in 16bits. | |
300 | * Omit one shift by by putting the signed field at MSB. | |
301 | */ | |
302 | #if defined(__BIG_ENDIAN_BITFIELD) | |
303 | __s16 hop_limit:9; | |
304 | __u16 __unused_1:7; | |
305 | #else | |
306 | __u16 __unused_1:7; | |
307 | __s16 hop_limit:9; | |
308 | #endif | |
309 | ||
310 | #if defined(__BIG_ENDIAN_BITFIELD) | |
311 | /* Packed in 16bits. */ | |
312 | __s16 mcast_hops:9; | |
313 | __u16 __unused_2:6, | |
314 | mc_loop:1; | |
315 | #else | |
316 | __u16 mc_loop:1, | |
317 | __unused_2:6; | |
318 | __s16 mcast_hops:9; | |
319 | #endif | |
320 | int mcast_oif; | |
321 | ||
322 | /* pktoption flags */ | |
323 | union { | |
324 | struct { | |
325 | __u16 srcrt:1, | |
326 | osrcrt:1, | |
327 | rxinfo:1, | |
328 | rxoinfo:1, | |
329 | rxhlim:1, | |
330 | rxohlim:1, | |
331 | hopopts:1, | |
332 | ohopopts:1, | |
333 | dstopts:1, | |
334 | odstopts:1, | |
335 | rxflow:1, | |
336 | rxtclass:1; | |
337 | } bits; | |
338 | __u16 all; | |
339 | } rxopt; | |
340 | ||
341 | /* sockopt flags */ | |
342 | __u8 recverr:1, | |
343 | sndflow:1, | |
344 | pmtudisc:2, | |
345 | ipv6only:1, | |
346 | srcprefs:3; /* 001: prefer temporary address | |
347 | * 010: prefer public address | |
348 | * 100: prefer care-of address | |
349 | */ | |
350 | __u8 tclass; | |
351 | ||
352 | __u32 dst_cookie; | |
353 | ||
354 | struct ipv6_mc_socklist *ipv6_mc_list; | |
355 | struct ipv6_ac_socklist *ipv6_ac_list; | |
356 | struct ipv6_fl_socklist *ipv6_fl_list; | |
357 | ||
358 | struct ipv6_txoptions *opt; | |
359 | struct sk_buff *pktoptions; | |
360 | struct { | |
361 | struct ipv6_txoptions *opt; | |
362 | u8 hop_limit; | |
363 | u8 tclass; | |
364 | } cork; | |
365 | }; | |
366 | ||
367 | /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ | |
368 | struct raw6_sock { | |
369 | /* inet_sock has to be the first member of raw6_sock */ | |
370 | struct inet_sock inet; | |
371 | __u32 checksum; /* perform checksum */ | |
372 | __u32 offset; /* checksum offset */ | |
373 | struct icmp6_filter filter; | |
374 | /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ | |
375 | struct ipv6_pinfo inet6; | |
376 | }; | |
377 | ||
378 | struct udp6_sock { | |
379 | struct udp_sock udp; | |
380 | /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ | |
381 | struct ipv6_pinfo inet6; | |
382 | }; | |
383 | ||
384 | struct tcp6_sock { | |
385 | struct tcp_sock tcp; | |
386 | /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ | |
387 | struct ipv6_pinfo inet6; | |
388 | }; | |
389 | ||
390 | extern int inet6_sk_rebuild_header(struct sock *sk); | |
391 | ||
392 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
393 | static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) | |
394 | { | |
395 | return inet_sk(__sk)->pinet6; | |
396 | } | |
397 | ||
398 | static inline struct inet6_request_sock * | |
399 | inet6_rsk(const struct request_sock *rsk) | |
400 | { | |
401 | return (struct inet6_request_sock *)(((u8 *)rsk) + | |
402 | inet_rsk(rsk)->inet6_rsk_offset); | |
403 | } | |
404 | ||
405 | static inline u32 inet6_rsk_offset(struct request_sock *rsk) | |
406 | { | |
407 | return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); | |
408 | } | |
409 | ||
410 | static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) | |
411 | { | |
412 | struct request_sock *req = reqsk_alloc(ops); | |
413 | ||
414 | if (req != NULL) { | |
415 | inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); | |
416 | inet6_rsk(req)->pktopts = NULL; | |
417 | } | |
418 | ||
419 | return req; | |
420 | } | |
421 | ||
422 | static inline struct raw6_sock *raw6_sk(const struct sock *sk) | |
423 | { | |
424 | return (struct raw6_sock *)sk; | |
425 | } | |
426 | ||
427 | static inline void inet_sk_copy_descendant(struct sock *sk_to, | |
428 | const struct sock *sk_from) | |
429 | { | |
430 | int ancestor_size = sizeof(struct inet_sock); | |
431 | ||
432 | if (sk_from->sk_family == PF_INET6) | |
433 | ancestor_size += sizeof(struct ipv6_pinfo); | |
434 | ||
435 | __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); | |
436 | } | |
437 | ||
438 | #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) | |
439 | #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) | |
440 | ||
441 | struct inet6_timewait_sock { | |
442 | struct in6_addr tw_v6_daddr; | |
443 | struct in6_addr tw_v6_rcv_saddr; | |
444 | }; | |
445 | ||
446 | struct tcp6_timewait_sock { | |
447 | struct tcp_timewait_sock tcp6tw_tcp; | |
448 | struct inet6_timewait_sock tcp6tw_inet6; | |
449 | }; | |
450 | ||
451 | static inline u16 inet6_tw_offset(const struct proto *prot) | |
452 | { | |
453 | return prot->twsk_prot->twsk_obj_size - | |
454 | sizeof(struct inet6_timewait_sock); | |
455 | } | |
456 | ||
457 | static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) | |
458 | { | |
459 | return (struct inet6_timewait_sock *)(((u8 *)sk) + | |
460 | inet_twsk(sk)->tw_ipv6_offset); | |
461 | } | |
462 | ||
463 | static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) | |
464 | { | |
465 | return likely(sk->sk_state != TCP_TIME_WAIT) ? | |
466 | &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; | |
467 | } | |
468 | ||
469 | static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) | |
470 | { | |
471 | return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; | |
472 | } | |
473 | ||
474 | static inline int inet_v6_ipv6only(const struct sock *sk) | |
475 | { | |
476 | return likely(sk->sk_state != TCP_TIME_WAIT) ? | |
477 | ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; | |
478 | } | |
479 | #else | |
480 | #define __ipv6_only_sock(sk) 0 | |
481 | #define ipv6_only_sock(sk) 0 | |
482 | ||
483 | static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) | |
484 | { | |
485 | return NULL; | |
486 | } | |
487 | ||
488 | static inline struct inet6_request_sock * | |
489 | inet6_rsk(const struct request_sock *rsk) | |
490 | { | |
491 | return NULL; | |
492 | } | |
493 | ||
494 | static inline struct raw6_sock *raw6_sk(const struct sock *sk) | |
495 | { | |
496 | return NULL; | |
497 | } | |
498 | ||
499 | #define __inet6_rcv_saddr(__sk) NULL | |
500 | #define inet6_rcv_saddr(__sk) NULL | |
501 | #define tcp_twsk_ipv6only(__sk) 0 | |
502 | #define inet_v6_ipv6only(__sk) 0 | |
503 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ | |
504 | ||
505 | #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\ | |
506 | (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ | |
507 | ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ | |
508 | ((__sk)->sk_family == AF_INET6) && \ | |
509 | ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ | |
510 | ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ | |
511 | (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) | |
512 | ||
513 | #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \ | |
514 | (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ | |
515 | (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \ | |
516 | ((__sk)->sk_family == PF_INET6) && \ | |
517 | (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \ | |
518 | (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \ | |
519 | (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) | |
520 | ||
521 | #endif /* __KERNEL__ */ | |
522 | ||
523 | #endif /* _IPV6_H */ |