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