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 struct ip6_mtuinfo {
25 struct sockaddr_in6 ip6m_addr;
26 __u32 ip6m_mtu;
27 };
28
29 struct in6_ifreq {
30 struct in6_addr ifr6_addr;
31 __u32 ifr6_prefixlen;
32 int ifr6_ifindex;
33 };
34
35 #define IPV6_SRCRT_STRICT 0x01 /* Deprecated; will be removed */
36 #define IPV6_SRCRT_TYPE_0 0 /* Deprecated; will be removed */
37 #define IPV6_SRCRT_TYPE_2 2 /* IPv6 type 2 Routing Header */
38
39 /*
40 * routing header
41 */
42 struct ipv6_rt_hdr {
43 __u8 nexthdr;
44 __u8 hdrlen;
45 __u8 type;
46 __u8 segments_left;
47
48 /*
49 * type specific data
50 * variable length field
51 */
52 };
53
54
55 struct ipv6_opt_hdr {
56 __u8 nexthdr;
57 __u8 hdrlen;
58 /*
59 * TLV encoded option data follows.
60 */
61 } __attribute__((packed)); /* required for some archs */
62
63 #define ipv6_destopt_hdr ipv6_opt_hdr
64 #define ipv6_hopopt_hdr ipv6_opt_hdr
65
66 #ifdef __KERNEL__
67 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
68 #endif
69
70 /*
71 * routing header type 0 (used in cmsghdr struct)
72 */
73
74 struct rt0_hdr {
75 struct ipv6_rt_hdr rt_hdr;
76 __u32 reserved;
77 struct in6_addr addr[0];
78
79 #define rt0_type rt_hdr.type
80 };
81
82 /*
83 * routing header type 2
84 */
85
86 struct rt2_hdr {
87 struct ipv6_rt_hdr rt_hdr;
88 __u32 reserved;
89 struct in6_addr addr;
90
91 #define rt2_type rt_hdr.type
92 };
93
94 /*
95 * home address option in destination options header
96 */
97
98 struct ipv6_destopt_hao {
99 __u8 type;
100 __u8 length;
101 struct in6_addr addr;
102 } __attribute__((packed));
103
104 /*
105 * IPv6 fixed header
106 *
107 * BEWARE, it is incorrect. The first 4 bits of flow_lbl
108 * are glued to priority now, forming "class".
109 */
110
111 struct ipv6hdr {
112 #if defined(__LITTLE_ENDIAN_BITFIELD)
113 __u8 priority:4,
114 version:4;
115 #elif defined(__BIG_ENDIAN_BITFIELD)
116 __u8 version:4,
117 priority:4;
118 #else
119 #error "Please fix <asm/byteorder.h>"
120 #endif
121 __u8 flow_lbl[3];
122
123 __be16 payload_len;
124 __u8 nexthdr;
125 __u8 hop_limit;
126
127 struct in6_addr saddr;
128 struct in6_addr daddr;
129 };
130
131 #ifdef __KERNEL__
132 /*
133 * This structure contains configuration options per IPv6 link.
134 */
135 struct ipv6_devconf {
136 __s32 forwarding;
137 __s32 hop_limit;
138 __s32 mtu6;
139 __s32 accept_ra;
140 __s32 accept_redirects;
141 __s32 autoconf;
142 __s32 dad_transmits;
143 __s32 rtr_solicits;
144 __s32 rtr_solicit_interval;
145 __s32 rtr_solicit_delay;
146 __s32 force_mld_version;
147 #ifdef CONFIG_IPV6_PRIVACY
148 __s32 use_tempaddr;
149 __s32 temp_valid_lft;
150 __s32 temp_prefered_lft;
151 __s32 regen_max_retry;
152 __s32 max_desync_factor;
153 #endif
154 __s32 max_addresses;
155 __s32 accept_ra_defrtr;
156 __s32 accept_ra_pinfo;
157 #ifdef CONFIG_IPV6_ROUTER_PREF
158 __s32 accept_ra_rtr_pref;
159 __s32 rtr_probe_interval;
160 #ifdef CONFIG_IPV6_ROUTE_INFO
161 __s32 accept_ra_rt_info_max_plen;
162 #endif
163 #endif
164 __s32 proxy_ndp;
165 __s32 accept_source_route;
166 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
167 __s32 optimistic_dad;
168 #endif
169 #ifdef CONFIG_IPV6_MROUTE
170 __s32 mc_forwarding;
171 #endif
172 __s32 disable_ipv6;
173 __s32 accept_dad;
174 __s32 force_tllao;
175 void *sysctl;
176 };
177
178 struct ipv6_params {
179 __s32 disable_ipv6;
180 __s32 autoconf;
181 };
182 extern struct ipv6_params ipv6_defaults;
183 #endif
184
185 /* index values for the variables in ipv6_devconf */
186 enum {
187 DEVCONF_FORWARDING = 0,
188 DEVCONF_HOPLIMIT,
189 DEVCONF_MTU6,
190 DEVCONF_ACCEPT_RA,
191 DEVCONF_ACCEPT_REDIRECTS,
192 DEVCONF_AUTOCONF,
193 DEVCONF_DAD_TRANSMITS,
194 DEVCONF_RTR_SOLICITS,
195 DEVCONF_RTR_SOLICIT_INTERVAL,
196 DEVCONF_RTR_SOLICIT_DELAY,
197 DEVCONF_USE_TEMPADDR,
198 DEVCONF_TEMP_VALID_LFT,
199 DEVCONF_TEMP_PREFERED_LFT,
200 DEVCONF_REGEN_MAX_RETRY,
201 DEVCONF_MAX_DESYNC_FACTOR,
202 DEVCONF_MAX_ADDRESSES,
203 DEVCONF_FORCE_MLD_VERSION,
204 DEVCONF_ACCEPT_RA_DEFRTR,
205 DEVCONF_ACCEPT_RA_PINFO,
206 DEVCONF_ACCEPT_RA_RTR_PREF,
207 DEVCONF_RTR_PROBE_INTERVAL,
208 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
209 DEVCONF_PROXY_NDP,
210 DEVCONF_OPTIMISTIC_DAD,
211 DEVCONF_ACCEPT_SOURCE_ROUTE,
212 DEVCONF_MC_FORWARDING,
213 DEVCONF_DISABLE_IPV6,
214 DEVCONF_ACCEPT_DAD,
215 DEVCONF_FORCE_TLLAO,
216 DEVCONF_MAX
217 };
218
219 #ifdef __KERNEL__
220 #include <linux/icmpv6.h>
221 #include <linux/tcp.h>
222 #include <linux/udp.h>
223
224 #include <net/inet_sock.h>
225
ipv6_hdr(const struct sk_buff * skb)226 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
227 {
228 return (struct ipv6hdr *)skb_network_header(skb);
229 }
230
ipipv6_hdr(const struct sk_buff * skb)231 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
232 {
233 return (struct ipv6hdr *)skb_transport_header(skb);
234 }
235
236 /*
237 This structure contains results of exthdrs parsing
238 as offsets from skb->nh.
239 */
240
241 struct inet6_skb_parm {
242 int iif;
243 __u16 ra;
244 __u16 hop;
245 __u16 dst0;
246 __u16 srcrt;
247 __u16 dst1;
248 __u16 lastopt;
249 __u16 nhoff;
250 __u16 flags;
251 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
252 __u16 dsthao;
253 #endif
254
255 #define IP6SKB_XFRM_TRANSFORMED 1
256 #define IP6SKB_FORWARDED 2
257 #define IP6SKB_REROUTED 4
258 };
259
260 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
261 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
262
inet6_iif(const struct sk_buff * skb)263 static inline int inet6_iif(const struct sk_buff *skb)
264 {
265 return IP6CB(skb)->iif;
266 }
267
268 struct inet6_request_sock {
269 struct in6_addr loc_addr;
270 struct in6_addr rmt_addr;
271 struct sk_buff *pktopts;
272 int iif;
273 };
274
275 struct tcp6_request_sock {
276 struct tcp_request_sock tcp6rsk_tcp;
277 struct inet6_request_sock tcp6rsk_inet6;
278 };
279
280 struct ipv6_mc_socklist;
281 struct ipv6_ac_socklist;
282 struct ipv6_fl_socklist;
283
284 /**
285 * struct ipv6_pinfo - ipv6 private area
286 *
287 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
288 * this _must_ be the last member, so that inet6_sk_generic
289 * is able to calculate its offset from the base struct sock
290 * by using the struct proto->slab_obj_size member. -acme
291 */
292 struct ipv6_pinfo {
293 struct in6_addr saddr;
294 struct in6_addr rcv_saddr;
295 struct in6_addr daddr;
296 struct in6_pktinfo sticky_pktinfo;
297 struct in6_addr *daddr_cache;
298 #ifdef CONFIG_IPV6_SUBTREES
299 struct in6_addr *saddr_cache;
300 #endif
301
302 __be32 flow_label;
303 __u32 frag_size;
304
305 /*
306 * Packed in 16bits.
307 * Omit one shift by by putting the signed field at MSB.
308 */
309 #if defined(__BIG_ENDIAN_BITFIELD)
310 __s16 hop_limit:9;
311 __u16 __unused_1:7;
312 #else
313 __u16 __unused_1:7;
314 __s16 hop_limit:9;
315 #endif
316
317 #if defined(__BIG_ENDIAN_BITFIELD)
318 /* Packed in 16bits. */
319 __s16 mcast_hops:9;
320 __u16 __unused_2:6,
321 mc_loop:1;
322 #else
323 __u16 mc_loop:1,
324 __unused_2:6;
325 __s16 mcast_hops:9;
326 #endif
327 int mcast_oif;
328
329 /* pktoption flags */
330 union {
331 struct {
332 __u16 srcrt:1,
333 osrcrt:1,
334 rxinfo:1,
335 rxoinfo:1,
336 rxhlim:1,
337 rxohlim:1,
338 hopopts:1,
339 ohopopts:1,
340 dstopts:1,
341 odstopts:1,
342 rxflow:1,
343 rxtclass:1,
344 rxpmtu:1,
345 rxorigdstaddr:1;
346 /* 2 bits hole */
347 } bits;
348 __u16 all;
349 } rxopt;
350
351 /* sockopt flags */
352 __u16 recverr:1,
353 sndflow:1,
354 pmtudisc:2,
355 ipv6only:1,
356 srcprefs:3, /* 001: prefer temporary address
357 * 010: prefer public address
358 * 100: prefer care-of address
359 */
360 dontfrag:1;
361 __u8 min_hopcount;
362 __u8 tclass;
363 __u8 padding;
364
365 __u32 dst_cookie;
366
367 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
368 struct ipv6_ac_socklist *ipv6_ac_list;
369 struct ipv6_fl_socklist *ipv6_fl_list;
370
371 struct ipv6_txoptions *opt;
372 struct sk_buff *pktoptions;
373 struct sk_buff *rxpmtu;
374 struct {
375 struct ipv6_txoptions *opt;
376 u8 hop_limit;
377 u8 tclass;
378 } cork;
379 };
380
381 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
382 struct raw6_sock {
383 /* inet_sock has to be the first member of raw6_sock */
384 struct inet_sock inet;
385 __u32 checksum; /* perform checksum */
386 __u32 offset; /* checksum offset */
387 struct icmp6_filter filter;
388 __u32 ip6mr_table;
389 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
390 struct ipv6_pinfo inet6;
391 };
392
393 struct udp6_sock {
394 struct udp_sock udp;
395 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
396 struct ipv6_pinfo inet6;
397 };
398
399 struct tcp6_sock {
400 struct tcp_sock tcp;
401 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
402 struct ipv6_pinfo inet6;
403 };
404
405 extern int inet6_sk_rebuild_header(struct sock *sk);
406
407 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
inet6_sk(const struct sock * __sk)408 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
409 {
410 return inet_sk(__sk)->pinet6;
411 }
412
413 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)414 inet6_rsk(const struct request_sock *rsk)
415 {
416 return (struct inet6_request_sock *)(((u8 *)rsk) +
417 inet_rsk(rsk)->inet6_rsk_offset);
418 }
419
inet6_rsk_offset(struct request_sock * rsk)420 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
421 {
422 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
423 }
424
inet6_reqsk_alloc(struct request_sock_ops * ops)425 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
426 {
427 struct request_sock *req = reqsk_alloc(ops);
428
429 if (req != NULL) {
430 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
431 inet6_rsk(req)->pktopts = NULL;
432 }
433
434 return req;
435 }
436
raw6_sk(const struct sock * sk)437 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
438 {
439 return (struct raw6_sock *)sk;
440 }
441
inet_sk_copy_descendant(struct sock * sk_to,const struct sock * sk_from)442 static inline void inet_sk_copy_descendant(struct sock *sk_to,
443 const struct sock *sk_from)
444 {
445 int ancestor_size = sizeof(struct inet_sock);
446
447 if (sk_from->sk_family == PF_INET6)
448 ancestor_size += sizeof(struct ipv6_pinfo);
449
450 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
451 }
452
453 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
454 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
455
456 struct inet6_timewait_sock {
457 struct in6_addr tw_v6_daddr;
458 struct in6_addr tw_v6_rcv_saddr;
459 };
460
461 struct tcp6_timewait_sock {
462 struct tcp_timewait_sock tcp6tw_tcp;
463 struct inet6_timewait_sock tcp6tw_inet6;
464 };
465
inet6_tw_offset(const struct proto * prot)466 static inline u16 inet6_tw_offset(const struct proto *prot)
467 {
468 return prot->twsk_prot->twsk_obj_size -
469 sizeof(struct inet6_timewait_sock);
470 }
471
inet6_twsk(const struct sock * sk)472 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
473 {
474 return (struct inet6_timewait_sock *)(((u8 *)sk) +
475 inet_twsk(sk)->tw_ipv6_offset);
476 }
477
__inet6_rcv_saddr(const struct sock * sk)478 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
479 {
480 return likely(sk->sk_state != TCP_TIME_WAIT) ?
481 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
482 }
483
inet6_rcv_saddr(const struct sock * sk)484 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
485 {
486 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
487 }
488
inet_v6_ipv6only(const struct sock * sk)489 static inline int inet_v6_ipv6only(const struct sock *sk)
490 {
491 return likely(sk->sk_state != TCP_TIME_WAIT) ?
492 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
493 }
494 #else
495 #define __ipv6_only_sock(sk) 0
496 #define ipv6_only_sock(sk) 0
497
inet6_sk(const struct sock * __sk)498 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
499 {
500 return NULL;
501 }
502
503 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)504 inet6_rsk(const struct request_sock *rsk)
505 {
506 return NULL;
507 }
508
raw6_sk(const struct sock * sk)509 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
510 {
511 return NULL;
512 }
513
514 #define __inet6_rcv_saddr(__sk) NULL
515 #define inet6_rcv_saddr(__sk) NULL
516 #define tcp_twsk_ipv6only(__sk) 0
517 #define inet_v6_ipv6only(__sk) 0
518 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
519
520 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
521 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
522 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
523 ((__sk)->sk_family == AF_INET6) && \
524 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
525 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
526 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
527
528 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
529 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
530 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \
531 ((__sk)->sk_family == PF_INET6) && \
532 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \
533 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
534 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
535
536 #endif /* __KERNEL__ */
537
538 #endif /* _IPV6_H */
539