Linux kernel mirror (for testing)
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linux
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
19struct in6_pktinfo {
20 struct in6_addr ipi6_addr;
21 int ipi6_ifindex;
22};
23
24
25struct 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 */
38struct 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
51struct 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
70struct 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
82struct 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
94struct 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
107struct 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 */
131struct 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 */
175enum {
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
214static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
215{
216 return (struct ipv6hdr *)skb_network_header(skb);
217}
218
219static 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
229struct 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
249static inline int inet6_iif(const struct sk_buff *skb)
250{
251 return IP6CB(skb)->iif;
252}
253
254struct 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
261struct tcp6_request_sock {
262 struct tcp_request_sock tcp6rsk_tcp;
263 struct inet6_request_sock tcp6rsk_inet6;
264};
265
266struct ipv6_mc_socklist;
267struct ipv6_ac_socklist;
268struct 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 */
278struct 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! */
361struct 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
371struct 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
377struct 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
383extern int inet6_sk_rebuild_header(struct sock *sk);
384
385#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
386static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
387{
388 return inet_sk(__sk)->pinet6;
389}
390
391static 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
398static inline u32 inet6_rsk_offset(struct request_sock *rsk)
399{
400 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
401}
402
403static 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
415static inline struct raw6_sock *raw6_sk(const struct sock *sk)
416{
417 return (struct raw6_sock *)sk;
418}
419
420static 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
434struct inet6_timewait_sock {
435 struct in6_addr tw_v6_daddr;
436 struct in6_addr tw_v6_rcv_saddr;
437};
438
439struct tcp6_timewait_sock {
440 struct tcp_timewait_sock tcp6tw_tcp;
441 struct inet6_timewait_sock tcp6tw_inet6;
442};
443
444static 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
450static 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
456static 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
462static 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
467static 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
476static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
477{
478 return NULL;
479}
480
481static inline struct inet6_request_sock *
482 inet6_rsk(const struct request_sock *rsk)
483{
484 return NULL;
485}
486
487static 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 */