Linux kernel mirror (for testing)
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linux
1#ifndef _IPV6_H
2#define _IPV6_H
3
4#include <linux/in6.h>
5#include <asm/byteorder.h>
6
7/* The latest drafts declared increase in minimal mtu up to 1280. */
8
9#define IPV6_MIN_MTU 1280
10
11/*
12 * Advanced API
13 * source interface/address selection, source routing, etc...
14 * *under construction*
15 */
16
17
18struct in6_pktinfo {
19 struct in6_addr ipi6_addr;
20 int ipi6_ifindex;
21};
22
23
24struct in6_ifreq {
25 struct in6_addr ifr6_addr;
26 __u32 ifr6_prefixlen;
27 int ifr6_ifindex;
28};
29
30#define IPV6_SRCRT_STRICT 0x01 /* Deprecated; will be removed */
31#define IPV6_SRCRT_TYPE_0 0 /* Deprecated; will be removed */
32#define IPV6_SRCRT_TYPE_2 2 /* IPv6 type 2 Routing Header */
33
34/*
35 * routing header
36 */
37struct ipv6_rt_hdr {
38 __u8 nexthdr;
39 __u8 hdrlen;
40 __u8 type;
41 __u8 segments_left;
42
43 /*
44 * type specific data
45 * variable length field
46 */
47};
48
49
50struct ipv6_opt_hdr {
51 __u8 nexthdr;
52 __u8 hdrlen;
53 /*
54 * TLV encoded option data follows.
55 */
56};
57
58#define ipv6_destopt_hdr ipv6_opt_hdr
59#define ipv6_hopopt_hdr ipv6_opt_hdr
60
61#ifdef __KERNEL__
62#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
63#endif
64
65/*
66 * routing header type 0 (used in cmsghdr struct)
67 */
68
69struct rt0_hdr {
70 struct ipv6_rt_hdr rt_hdr;
71 __u32 reserved;
72 struct in6_addr addr[0];
73
74#define rt0_type rt_hdr.type
75};
76
77/*
78 * routing header type 2
79 */
80
81struct rt2_hdr {
82 struct ipv6_rt_hdr rt_hdr;
83 __u32 reserved;
84 struct in6_addr addr;
85
86#define rt2_type rt_hdr.type
87};
88
89/*
90 * home address option in destination options header
91 */
92
93struct ipv6_destopt_hao {
94 __u8 type;
95 __u8 length;
96 struct in6_addr addr;
97} __attribute__ ((__packed__));
98
99/*
100 * IPv6 fixed header
101 *
102 * BEWARE, it is incorrect. The first 4 bits of flow_lbl
103 * are glued to priority now, forming "class".
104 */
105
106struct ipv6hdr {
107#if defined(__LITTLE_ENDIAN_BITFIELD)
108 __u8 priority:4,
109 version:4;
110#elif defined(__BIG_ENDIAN_BITFIELD)
111 __u8 version:4,
112 priority:4;
113#else
114#error "Please fix <asm/byteorder.h>"
115#endif
116 __u8 flow_lbl[3];
117
118 __be16 payload_len;
119 __u8 nexthdr;
120 __u8 hop_limit;
121
122 struct in6_addr saddr;
123 struct in6_addr daddr;
124};
125
126/*
127 * This structure contains configuration options per IPv6 link.
128 */
129struct ipv6_devconf {
130 __s32 forwarding;
131 __s32 hop_limit;
132 __s32 mtu6;
133 __s32 accept_ra;
134 __s32 accept_redirects;
135 __s32 autoconf;
136 __s32 dad_transmits;
137 __s32 rtr_solicits;
138 __s32 rtr_solicit_interval;
139 __s32 rtr_solicit_delay;
140 __s32 force_mld_version;
141#ifdef CONFIG_IPV6_PRIVACY
142 __s32 use_tempaddr;
143 __s32 temp_valid_lft;
144 __s32 temp_prefered_lft;
145 __s32 regen_max_retry;
146 __s32 max_desync_factor;
147#endif
148 __s32 max_addresses;
149 __s32 accept_ra_defrtr;
150 __s32 accept_ra_pinfo;
151#ifdef CONFIG_IPV6_ROUTER_PREF
152 __s32 accept_ra_rtr_pref;
153 __s32 rtr_probe_interval;
154#ifdef CONFIG_IPV6_ROUTE_INFO
155 __s32 accept_ra_rt_info_max_plen;
156#endif
157#endif
158 __s32 proxy_ndp;
159 __s32 accept_source_route;
160#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
161 __s32 optimistic_dad;
162#endif
163 void *sysctl;
164};
165
166/* index values for the variables in ipv6_devconf */
167enum {
168 DEVCONF_FORWARDING = 0,
169 DEVCONF_HOPLIMIT,
170 DEVCONF_MTU6,
171 DEVCONF_ACCEPT_RA,
172 DEVCONF_ACCEPT_REDIRECTS,
173 DEVCONF_AUTOCONF,
174 DEVCONF_DAD_TRANSMITS,
175 DEVCONF_RTR_SOLICITS,
176 DEVCONF_RTR_SOLICIT_INTERVAL,
177 DEVCONF_RTR_SOLICIT_DELAY,
178 DEVCONF_USE_TEMPADDR,
179 DEVCONF_TEMP_VALID_LFT,
180 DEVCONF_TEMP_PREFERED_LFT,
181 DEVCONF_REGEN_MAX_RETRY,
182 DEVCONF_MAX_DESYNC_FACTOR,
183 DEVCONF_MAX_ADDRESSES,
184 DEVCONF_FORCE_MLD_VERSION,
185 DEVCONF_ACCEPT_RA_DEFRTR,
186 DEVCONF_ACCEPT_RA_PINFO,
187 DEVCONF_ACCEPT_RA_RTR_PREF,
188 DEVCONF_RTR_PROBE_INTERVAL,
189 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
190 DEVCONF_PROXY_NDP,
191 DEVCONF_OPTIMISTIC_DAD,
192 DEVCONF_ACCEPT_SOURCE_ROUTE,
193 DEVCONF_MAX
194};
195
196#ifdef __KERNEL__
197#include <linux/icmpv6.h>
198#include <linux/tcp.h>
199#include <linux/udp.h>
200
201#include <net/inet_sock.h>
202
203static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
204{
205 return (struct ipv6hdr *)skb_network_header(skb);
206}
207
208static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
209{
210 return (struct ipv6hdr *)skb_transport_header(skb);
211}
212
213/*
214 This structure contains results of exthdrs parsing
215 as offsets from skb->nh.
216 */
217
218struct inet6_skb_parm {
219 int iif;
220 __u16 ra;
221 __u16 hop;
222 __u16 dst0;
223 __u16 srcrt;
224 __u16 dst1;
225 __u16 lastopt;
226 __u32 nhoff;
227 __u16 flags;
228#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
229 __u16 dsthao;
230#endif
231
232#define IP6SKB_XFRM_TRANSFORMED 1
233};
234
235#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
236
237static inline int inet6_iif(const struct sk_buff *skb)
238{
239 return IP6CB(skb)->iif;
240}
241
242struct inet6_request_sock {
243 struct in6_addr loc_addr;
244 struct in6_addr rmt_addr;
245 struct sk_buff *pktopts;
246 int iif;
247};
248
249struct tcp6_request_sock {
250 struct tcp_request_sock tcp6rsk_tcp;
251 struct inet6_request_sock tcp6rsk_inet6;
252};
253
254struct ipv6_mc_socklist;
255struct ipv6_ac_socklist;
256struct ipv6_fl_socklist;
257
258/**
259 * struct ipv6_pinfo - ipv6 private area
260 *
261 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
262 * this _must_ be the last member, so that inet6_sk_generic
263 * is able to calculate its offset from the base struct sock
264 * by using the struct proto->slab_obj_size member. -acme
265 */
266struct ipv6_pinfo {
267 struct in6_addr saddr;
268 struct in6_addr rcv_saddr;
269 struct in6_addr daddr;
270 struct in6_addr *daddr_cache;
271#ifdef CONFIG_IPV6_SUBTREES
272 struct in6_addr *saddr_cache;
273#endif
274
275 __be32 flow_label;
276 __u32 frag_size;
277 __s16 hop_limit;
278 __s16 mcast_hops;
279 int mcast_oif;
280
281 /* pktoption flags */
282 union {
283 struct {
284 __u16 srcrt:1,
285 osrcrt:1,
286 rxinfo:1,
287 rxoinfo:1,
288 rxhlim:1,
289 rxohlim:1,
290 hopopts:1,
291 ohopopts:1,
292 dstopts:1,
293 odstopts:1,
294 rxflow:1,
295 rxtclass:1;
296 } bits;
297 __u16 all;
298 } rxopt;
299
300 /* sockopt flags */
301 __u8 mc_loop:1,
302 recverr:1,
303 sndflow:1,
304 pmtudisc:2,
305 ipv6only:1;
306 __u8 tclass;
307
308 __u32 dst_cookie;
309
310 struct ipv6_mc_socklist *ipv6_mc_list;
311 struct ipv6_ac_socklist *ipv6_ac_list;
312 struct ipv6_fl_socklist *ipv6_fl_list;
313
314 struct ipv6_txoptions *opt;
315 struct sk_buff *pktoptions;
316 struct {
317 struct ipv6_txoptions *opt;
318 struct rt6_info *rt;
319 int hop_limit;
320 int tclass;
321 } cork;
322};
323
324/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
325struct raw6_sock {
326 /* inet_sock has to be the first member of raw6_sock */
327 struct inet_sock inet;
328 __u32 checksum; /* perform checksum */
329 __u32 offset; /* checksum offset */
330 struct icmp6_filter filter;
331 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
332 struct ipv6_pinfo inet6;
333};
334
335struct udp6_sock {
336 struct udp_sock udp;
337 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
338 struct ipv6_pinfo inet6;
339};
340
341struct tcp6_sock {
342 struct tcp_sock tcp;
343 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
344 struct ipv6_pinfo inet6;
345};
346
347extern int inet6_sk_rebuild_header(struct sock *sk);
348
349#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
350static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
351{
352 return inet_sk(__sk)->pinet6;
353}
354
355static inline struct inet6_request_sock *
356 inet6_rsk(const struct request_sock *rsk)
357{
358 return (struct inet6_request_sock *)(((u8 *)rsk) +
359 inet_rsk(rsk)->inet6_rsk_offset);
360}
361
362static inline u32 inet6_rsk_offset(struct request_sock *rsk)
363{
364 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
365}
366
367static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
368{
369 struct request_sock *req = reqsk_alloc(ops);
370
371 if (req != NULL)
372 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
373
374 return req;
375}
376
377static inline struct raw6_sock *raw6_sk(const struct sock *sk)
378{
379 return (struct raw6_sock *)sk;
380}
381
382static inline void inet_sk_copy_descendant(struct sock *sk_to,
383 const struct sock *sk_from)
384{
385 int ancestor_size = sizeof(struct inet_sock);
386
387 if (sk_from->sk_family == PF_INET6)
388 ancestor_size += sizeof(struct ipv6_pinfo);
389
390 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
391}
392
393#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
394#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
395
396struct inet6_timewait_sock {
397 struct in6_addr tw_v6_daddr;
398 struct in6_addr tw_v6_rcv_saddr;
399};
400
401struct tcp6_timewait_sock {
402 struct tcp_timewait_sock tcp6tw_tcp;
403 struct inet6_timewait_sock tcp6tw_inet6;
404};
405
406static inline u16 inet6_tw_offset(const struct proto *prot)
407{
408 return prot->twsk_prot->twsk_obj_size -
409 sizeof(struct inet6_timewait_sock);
410}
411
412static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
413{
414 return (struct inet6_timewait_sock *)(((u8 *)sk) +
415 inet_twsk(sk)->tw_ipv6_offset);
416}
417
418static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
419{
420 return likely(sk->sk_state != TCP_TIME_WAIT) ?
421 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
422}
423
424static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
425{
426 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
427}
428
429static inline int inet_v6_ipv6only(const struct sock *sk)
430{
431 return likely(sk->sk_state != TCP_TIME_WAIT) ?
432 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
433}
434#else
435#define __ipv6_only_sock(sk) 0
436#define ipv6_only_sock(sk) 0
437
438static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
439{
440 return NULL;
441}
442
443static inline struct inet6_request_sock *
444 inet6_rsk(const struct request_sock *rsk)
445{
446 return NULL;
447}
448
449static inline struct raw6_sock *raw6_sk(const struct sock *sk)
450{
451 return NULL;
452}
453
454#define __inet6_rcv_saddr(__sk) NULL
455#define inet6_rcv_saddr(__sk) NULL
456#define tcp_twsk_ipv6only(__sk) 0
457#define inet_v6_ipv6only(__sk) 0
458#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
459
460#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
461 (((__sk)->sk_hash == (__hash)) && \
462 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \
463 ((__sk)->sk_family == AF_INET6) && \
464 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
465 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
466 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
467
468#endif /* __KERNEL__ */
469
470#endif /* _IPV6_H */