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 /* this hop must be a neighbor */
31#define IPV6_SRCRT_TYPE_0 0 /* IPv6 type 0 Routing Header */
32
33/*
34 * routing header
35 */
36struct ipv6_rt_hdr {
37 __u8 nexthdr;
38 __u8 hdrlen;
39 __u8 type;
40 __u8 segments_left;
41
42 /*
43 * type specific data
44 * variable length field
45 */
46};
47
48
49struct ipv6_opt_hdr {
50 __u8 nexthdr;
51 __u8 hdrlen;
52 /*
53 * TLV encoded option data follows.
54 */
55};
56
57#define ipv6_destopt_hdr ipv6_opt_hdr
58#define ipv6_hopopt_hdr ipv6_opt_hdr
59
60#ifdef __KERNEL__
61#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
62#endif
63
64/*
65 * routing header type 0 (used in cmsghdr struct)
66 */
67
68struct rt0_hdr {
69 struct ipv6_rt_hdr rt_hdr;
70 __u32 reserved;
71 struct in6_addr addr[0];
72
73#define rt0_type rt_hdr.type
74};
75
76struct ipv6_auth_hdr {
77 __u8 nexthdr;
78 __u8 hdrlen; /* This one is measured in 32 bit units! */
79 __u16 reserved;
80 __u32 spi;
81 __u32 seq_no; /* Sequence number */
82 __u8 auth_data[0]; /* Length variable but >=4. Mind the 64 bit alignment! */
83};
84
85struct ipv6_esp_hdr {
86 __u32 spi;
87 __u32 seq_no; /* Sequence number */
88 __u8 enc_data[0]; /* Length variable but >=8. Mind the 64 bit alignment! */
89};
90
91struct ipv6_comp_hdr {
92 __u8 nexthdr;
93 __u8 flags;
94 __u16 cpi;
95};
96
97/*
98 * IPv6 fixed header
99 *
100 * BEWARE, it is incorrect. The first 4 bits of flow_lbl
101 * are glued to priority now, forming "class".
102 */
103
104struct ipv6hdr {
105#if defined(__LITTLE_ENDIAN_BITFIELD)
106 __u8 priority:4,
107 version:4;
108#elif defined(__BIG_ENDIAN_BITFIELD)
109 __u8 version:4,
110 priority:4;
111#else
112#error "Please fix <asm/byteorder.h>"
113#endif
114 __u8 flow_lbl[3];
115
116 __u16 payload_len;
117 __u8 nexthdr;
118 __u8 hop_limit;
119
120 struct in6_addr saddr;
121 struct in6_addr daddr;
122};
123
124/*
125 * This structure contains configuration options per IPv6 link.
126 */
127struct ipv6_devconf {
128 __s32 forwarding;
129 __s32 hop_limit;
130 __s32 mtu6;
131 __s32 accept_ra;
132 __s32 accept_redirects;
133 __s32 autoconf;
134 __s32 dad_transmits;
135 __s32 rtr_solicits;
136 __s32 rtr_solicit_interval;
137 __s32 rtr_solicit_delay;
138 __s32 force_mld_version;
139#ifdef CONFIG_IPV6_PRIVACY
140 __s32 use_tempaddr;
141 __s32 temp_valid_lft;
142 __s32 temp_prefered_lft;
143 __s32 regen_max_retry;
144 __s32 max_desync_factor;
145#endif
146 __s32 max_addresses;
147 __s32 accept_ra_defrtr;
148 __s32 accept_ra_pinfo;
149#ifdef CONFIG_IPV6_ROUTER_PREF
150 __s32 accept_ra_rtr_pref;
151 __s32 rtr_probe_interval;
152#ifdef CONFIG_IPV6_ROUTE_INFO
153 __s32 accept_ra_rt_info_max_plen;
154#endif
155#endif
156 void *sysctl;
157};
158
159/* index values for the variables in ipv6_devconf */
160enum {
161 DEVCONF_FORWARDING = 0,
162 DEVCONF_HOPLIMIT,
163 DEVCONF_MTU6,
164 DEVCONF_ACCEPT_RA,
165 DEVCONF_ACCEPT_REDIRECTS,
166 DEVCONF_AUTOCONF,
167 DEVCONF_DAD_TRANSMITS,
168 DEVCONF_RTR_SOLICITS,
169 DEVCONF_RTR_SOLICIT_INTERVAL,
170 DEVCONF_RTR_SOLICIT_DELAY,
171 DEVCONF_USE_TEMPADDR,
172 DEVCONF_TEMP_VALID_LFT,
173 DEVCONF_TEMP_PREFERED_LFT,
174 DEVCONF_REGEN_MAX_RETRY,
175 DEVCONF_MAX_DESYNC_FACTOR,
176 DEVCONF_MAX_ADDRESSES,
177 DEVCONF_FORCE_MLD_VERSION,
178 DEVCONF_ACCEPT_RA_DEFRTR,
179 DEVCONF_ACCEPT_RA_PINFO,
180 DEVCONF_ACCEPT_RA_RTR_PREF,
181 DEVCONF_RTR_PROBE_INTERVAL,
182 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
183 DEVCONF_MAX
184};
185
186#ifdef __KERNEL__
187#include <linux/icmpv6.h>
188#include <linux/tcp.h>
189#include <linux/udp.h>
190
191#include <net/if_inet6.h> /* struct ipv6_mc_socklist */
192#include <net/inet_sock.h>
193
194/*
195 This structure contains results of exthdrs parsing
196 as offsets from skb->nh.
197 */
198
199struct inet6_skb_parm {
200 int iif;
201 __u16 ra;
202 __u16 hop;
203 __u16 dst0;
204 __u16 srcrt;
205 __u16 dst1;
206 __u16 lastopt;
207 __u32 nhoff;
208 __u16 flags;
209
210#define IP6SKB_XFRM_TRANSFORMED 1
211};
212
213#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
214
215static inline int inet6_iif(const struct sk_buff *skb)
216{
217 return IP6CB(skb)->iif;
218}
219
220struct inet6_request_sock {
221 struct in6_addr loc_addr;
222 struct in6_addr rmt_addr;
223 struct sk_buff *pktopts;
224 int iif;
225};
226
227struct tcp6_request_sock {
228 struct tcp_request_sock tcp6rsk_tcp;
229 struct inet6_request_sock tcp6rsk_inet6;
230};
231
232/**
233 * struct ipv6_pinfo - ipv6 private area
234 *
235 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
236 * this _must_ be the last member, so that inet6_sk_generic
237 * is able to calculate its offset from the base struct sock
238 * by using the struct proto->slab_obj_size member. -acme
239 */
240struct ipv6_pinfo {
241 struct in6_addr saddr;
242 struct in6_addr rcv_saddr;
243 struct in6_addr daddr;
244 struct in6_addr *daddr_cache;
245
246 __u32 flow_label;
247 __u32 frag_size;
248 __s16 hop_limit;
249 __s16 mcast_hops;
250 int mcast_oif;
251
252 /* pktoption flags */
253 union {
254 struct {
255 __u16 srcrt:2,
256 osrcrt:2,
257 rxinfo:1,
258 rxoinfo:1,
259 rxhlim:1,
260 rxohlim:1,
261 hopopts:1,
262 ohopopts:1,
263 dstopts:1,
264 odstopts:1,
265 rxflow:1,
266 rxtclass:1;
267 } bits;
268 __u16 all;
269 } rxopt;
270
271 /* sockopt flags */
272 __u8 mc_loop:1,
273 recverr:1,
274 sndflow:1,
275 pmtudisc:2,
276 ipv6only:1;
277 __u8 tclass;
278
279 __u32 dst_cookie;
280
281 struct ipv6_mc_socklist *ipv6_mc_list;
282 struct ipv6_ac_socklist *ipv6_ac_list;
283 struct ipv6_fl_socklist *ipv6_fl_list;
284
285 struct ipv6_txoptions *opt;
286 struct sk_buff *pktoptions;
287 struct {
288 struct ipv6_txoptions *opt;
289 struct rt6_info *rt;
290 int hop_limit;
291 int tclass;
292 } cork;
293};
294
295/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
296struct raw6_sock {
297 /* inet_sock has to be the first member of raw6_sock */
298 struct inet_sock inet;
299 __u32 checksum; /* perform checksum */
300 __u32 offset; /* checksum offset */
301 struct icmp6_filter filter;
302 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
303 struct ipv6_pinfo inet6;
304};
305
306struct udp6_sock {
307 struct udp_sock udp;
308 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
309 struct ipv6_pinfo inet6;
310};
311
312struct tcp6_sock {
313 struct tcp_sock tcp;
314 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
315 struct ipv6_pinfo inet6;
316};
317
318extern int inet6_sk_rebuild_header(struct sock *sk);
319
320#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
321static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
322{
323 return inet_sk(__sk)->pinet6;
324}
325
326static inline struct inet6_request_sock *
327 inet6_rsk(const struct request_sock *rsk)
328{
329 return (struct inet6_request_sock *)(((u8 *)rsk) +
330 inet_rsk(rsk)->inet6_rsk_offset);
331}
332
333static inline u32 inet6_rsk_offset(struct request_sock *rsk)
334{
335 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
336}
337
338static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
339{
340 struct request_sock *req = reqsk_alloc(ops);
341
342 if (req != NULL)
343 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
344
345 return req;
346}
347
348static inline struct raw6_sock *raw6_sk(const struct sock *sk)
349{
350 return (struct raw6_sock *)sk;
351}
352
353static inline void inet_sk_copy_descendant(struct sock *sk_to,
354 const struct sock *sk_from)
355{
356 int ancestor_size = sizeof(struct inet_sock);
357
358 if (sk_from->sk_family == PF_INET6)
359 ancestor_size += sizeof(struct ipv6_pinfo);
360
361 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
362}
363
364#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
365#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
366
367struct inet6_timewait_sock {
368 struct in6_addr tw_v6_daddr;
369 struct in6_addr tw_v6_rcv_saddr;
370};
371
372struct tcp6_timewait_sock {
373 struct tcp_timewait_sock tcp6tw_tcp;
374 struct inet6_timewait_sock tcp6tw_inet6;
375};
376
377static inline u16 inet6_tw_offset(const struct proto *prot)
378{
379 return prot->twsk_prot->twsk_obj_size -
380 sizeof(struct inet6_timewait_sock);
381}
382
383static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
384{
385 return (struct inet6_timewait_sock *)(((u8 *)sk) +
386 inet_twsk(sk)->tw_ipv6_offset);
387}
388
389static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
390{
391 return likely(sk->sk_state != TCP_TIME_WAIT) ?
392 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
393}
394
395static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
396{
397 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
398}
399
400static inline int inet_v6_ipv6only(const struct sock *sk)
401{
402 return likely(sk->sk_state != TCP_TIME_WAIT) ?
403 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
404}
405#else
406#define __ipv6_only_sock(sk) 0
407#define ipv6_only_sock(sk) 0
408
409static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
410{
411 return NULL;
412}
413
414static inline struct inet6_request_sock *
415 inet6_rsk(const struct request_sock *rsk)
416{
417 return NULL;
418}
419
420static inline struct raw6_sock *raw6_sk(const struct sock *sk)
421{
422 return NULL;
423}
424
425#define __inet6_rcv_saddr(__sk) NULL
426#define inet6_rcv_saddr(__sk) NULL
427#define tcp_twsk_ipv6only(__sk) 0
428#define inet_v6_ipv6only(__sk) 0
429#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
430
431#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
432 (((__sk)->sk_hash == (__hash)) && \
433 ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \
434 ((__sk)->sk_family == AF_INET6) && \
435 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
436 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
437 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
438
439#endif /* __KERNEL__ */
440
441#endif /* _IPV6_H */