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#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
99struct ipv6_auth_hdr {
100 __u8 nexthdr;
101 __u8 hdrlen; /* This one is measured in 32 bit units! */
102 __be16 reserved;
103 __be32 spi;
104 __be32 seq_no; /* Sequence number */
105 __u8 auth_data[0]; /* Length variable but >=4. Mind the 64 bit alignment! */
106};
107
108struct ipv6_esp_hdr {
109 __be32 spi;
110 __be32 seq_no; /* Sequence number */
111 __u8 enc_data[0]; /* Length variable but >=8. Mind the 64 bit alignment! */
112};
113
114struct ipv6_comp_hdr {
115 __u8 nexthdr;
116 __u8 flags;
117 __be16 cpi;
118};
119
120/*
121 * IPv6 fixed header
122 *
123 * BEWARE, it is incorrect. The first 4 bits of flow_lbl
124 * are glued to priority now, forming "class".
125 */
126
127struct ipv6hdr {
128#if defined(__LITTLE_ENDIAN_BITFIELD)
129 __u8 priority:4,
130 version:4;
131#elif defined(__BIG_ENDIAN_BITFIELD)
132 __u8 version:4,
133 priority:4;
134#else
135#error "Please fix <asm/byteorder.h>"
136#endif
137 __u8 flow_lbl[3];
138
139 __be16 payload_len;
140 __u8 nexthdr;
141 __u8 hop_limit;
142
143 struct in6_addr saddr;
144 struct in6_addr daddr;
145};
146
147/*
148 * This structure contains configuration options per IPv6 link.
149 */
150struct ipv6_devconf {
151 __s32 forwarding;
152 __s32 hop_limit;
153 __s32 mtu6;
154 __s32 accept_ra;
155 __s32 accept_redirects;
156 __s32 autoconf;
157 __s32 dad_transmits;
158 __s32 rtr_solicits;
159 __s32 rtr_solicit_interval;
160 __s32 rtr_solicit_delay;
161 __s32 force_mld_version;
162#ifdef CONFIG_IPV6_PRIVACY
163 __s32 use_tempaddr;
164 __s32 temp_valid_lft;
165 __s32 temp_prefered_lft;
166 __s32 regen_max_retry;
167 __s32 max_desync_factor;
168#endif
169 __s32 max_addresses;
170 __s32 accept_ra_defrtr;
171 __s32 accept_ra_pinfo;
172#ifdef CONFIG_IPV6_ROUTER_PREF
173 __s32 accept_ra_rtr_pref;
174 __s32 rtr_probe_interval;
175#ifdef CONFIG_IPV6_ROUTE_INFO
176 __s32 accept_ra_rt_info_max_plen;
177#endif
178#endif
179 __s32 proxy_ndp;
180 void *sysctl;
181};
182
183/* index values for the variables in ipv6_devconf */
184enum {
185 DEVCONF_FORWARDING = 0,
186 DEVCONF_HOPLIMIT,
187 DEVCONF_MTU6,
188 DEVCONF_ACCEPT_RA,
189 DEVCONF_ACCEPT_REDIRECTS,
190 DEVCONF_AUTOCONF,
191 DEVCONF_DAD_TRANSMITS,
192 DEVCONF_RTR_SOLICITS,
193 DEVCONF_RTR_SOLICIT_INTERVAL,
194 DEVCONF_RTR_SOLICIT_DELAY,
195 DEVCONF_USE_TEMPADDR,
196 DEVCONF_TEMP_VALID_LFT,
197 DEVCONF_TEMP_PREFERED_LFT,
198 DEVCONF_REGEN_MAX_RETRY,
199 DEVCONF_MAX_DESYNC_FACTOR,
200 DEVCONF_MAX_ADDRESSES,
201 DEVCONF_FORCE_MLD_VERSION,
202 DEVCONF_ACCEPT_RA_DEFRTR,
203 DEVCONF_ACCEPT_RA_PINFO,
204 DEVCONF_ACCEPT_RA_RTR_PREF,
205 DEVCONF_RTR_PROBE_INTERVAL,
206 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
207 DEVCONF_PROXY_NDP,
208 DEVCONF_MAX
209};
210
211#ifdef __KERNEL__
212#include <linux/icmpv6.h>
213#include <linux/tcp.h>
214#include <linux/udp.h>
215
216#include <net/if_inet6.h> /* struct ipv6_mc_socklist */
217#include <net/inet_sock.h>
218
219/*
220 This structure contains results of exthdrs parsing
221 as offsets from skb->nh.
222 */
223
224struct inet6_skb_parm {
225 int iif;
226 __u16 ra;
227 __u16 hop;
228 __u16 dst0;
229 __u16 srcrt;
230 __u16 dst1;
231 __u16 lastopt;
232 __u32 nhoff;
233 __u16 flags;
234#ifdef CONFIG_IPV6_MIP6
235 __u16 dsthao;
236#endif
237
238#define IP6SKB_XFRM_TRANSFORMED 1
239};
240
241#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
242
243static inline int inet6_iif(const struct sk_buff *skb)
244{
245 return IP6CB(skb)->iif;
246}
247
248struct inet6_request_sock {
249 struct in6_addr loc_addr;
250 struct in6_addr rmt_addr;
251 struct sk_buff *pktopts;
252 int iif;
253};
254
255struct tcp6_request_sock {
256 struct tcp_request_sock tcp6rsk_tcp;
257 struct inet6_request_sock tcp6rsk_inet6;
258};
259
260/**
261 * struct ipv6_pinfo - ipv6 private area
262 *
263 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
264 * this _must_ be the last member, so that inet6_sk_generic
265 * is able to calculate its offset from the base struct sock
266 * by using the struct proto->slab_obj_size member. -acme
267 */
268struct ipv6_pinfo {
269 struct in6_addr saddr;
270 struct in6_addr rcv_saddr;
271 struct in6_addr daddr;
272 struct in6_addr *daddr_cache;
273#ifdef CONFIG_IPV6_SUBTREES
274 struct in6_addr *saddr_cache;
275#endif
276
277 __be32 flow_label;
278 __u32 frag_size;
279 __s16 hop_limit;
280 __s16 mcast_hops;
281 int mcast_oif;
282
283 /* pktoption flags */
284 union {
285 struct {
286 __u16 srcrt:2,
287 osrcrt:2,
288 rxinfo:1,
289 rxoinfo:1,
290 rxhlim:1,
291 rxohlim:1,
292 hopopts:1,
293 ohopopts:1,
294 dstopts:1,
295 odstopts:1,
296 rxflow:1,
297 rxtclass:1;
298 } bits;
299 __u16 all;
300 } rxopt;
301
302 /* sockopt flags */
303 __u8 mc_loop:1,
304 recverr:1,
305 sndflow:1,
306 pmtudisc:2,
307 ipv6only:1;
308 __u8 tclass;
309
310 __u32 dst_cookie;
311
312 struct ipv6_mc_socklist *ipv6_mc_list;
313 struct ipv6_ac_socklist *ipv6_ac_list;
314 struct ipv6_fl_socklist *ipv6_fl_list;
315
316 struct ipv6_txoptions *opt;
317 struct sk_buff *pktoptions;
318 struct {
319 struct ipv6_txoptions *opt;
320 struct rt6_info *rt;
321 int hop_limit;
322 int tclass;
323 } cork;
324};
325
326/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
327struct raw6_sock {
328 /* inet_sock has to be the first member of raw6_sock */
329 struct inet_sock inet;
330 __u32 checksum; /* perform checksum */
331 __u32 offset; /* checksum offset */
332 struct icmp6_filter filter;
333 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
334 struct ipv6_pinfo inet6;
335};
336
337struct udp6_sock {
338 struct udp_sock udp;
339 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
340 struct ipv6_pinfo inet6;
341};
342
343struct tcp6_sock {
344 struct tcp_sock tcp;
345 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
346 struct ipv6_pinfo inet6;
347};
348
349extern int inet6_sk_rebuild_header(struct sock *sk);
350
351#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
352static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
353{
354 return inet_sk(__sk)->pinet6;
355}
356
357static inline struct inet6_request_sock *
358 inet6_rsk(const struct request_sock *rsk)
359{
360 return (struct inet6_request_sock *)(((u8 *)rsk) +
361 inet_rsk(rsk)->inet6_rsk_offset);
362}
363
364static inline u32 inet6_rsk_offset(struct request_sock *rsk)
365{
366 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
367}
368
369static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
370{
371 struct request_sock *req = reqsk_alloc(ops);
372
373 if (req != NULL)
374 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
375
376 return req;
377}
378
379static inline struct raw6_sock *raw6_sk(const struct sock *sk)
380{
381 return (struct raw6_sock *)sk;
382}
383
384static inline void inet_sk_copy_descendant(struct sock *sk_to,
385 const struct sock *sk_from)
386{
387 int ancestor_size = sizeof(struct inet_sock);
388
389 if (sk_from->sk_family == PF_INET6)
390 ancestor_size += sizeof(struct ipv6_pinfo);
391
392 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
393}
394
395#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
396#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
397
398struct inet6_timewait_sock {
399 struct in6_addr tw_v6_daddr;
400 struct in6_addr tw_v6_rcv_saddr;
401};
402
403struct tcp6_timewait_sock {
404 struct tcp_timewait_sock tcp6tw_tcp;
405 struct inet6_timewait_sock tcp6tw_inet6;
406};
407
408static inline u16 inet6_tw_offset(const struct proto *prot)
409{
410 return prot->twsk_prot->twsk_obj_size -
411 sizeof(struct inet6_timewait_sock);
412}
413
414static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
415{
416 return (struct inet6_timewait_sock *)(((u8 *)sk) +
417 inet_twsk(sk)->tw_ipv6_offset);
418}
419
420static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
421{
422 return likely(sk->sk_state != TCP_TIME_WAIT) ?
423 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
424}
425
426static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
427{
428 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
429}
430
431static inline int inet_v6_ipv6only(const struct sock *sk)
432{
433 return likely(sk->sk_state != TCP_TIME_WAIT) ?
434 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
435}
436#else
437#define __ipv6_only_sock(sk) 0
438#define ipv6_only_sock(sk) 0
439
440static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
441{
442 return NULL;
443}
444
445static inline struct inet6_request_sock *
446 inet6_rsk(const struct request_sock *rsk)
447{
448 return NULL;
449}
450
451static inline struct raw6_sock *raw6_sk(const struct sock *sk)
452{
453 return NULL;
454}
455
456#define __inet6_rcv_saddr(__sk) NULL
457#define inet6_rcv_saddr(__sk) NULL
458#define tcp_twsk_ipv6only(__sk) 0
459#define inet_v6_ipv6only(__sk) 0
460#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
461
462#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
463 (((__sk)->sk_hash == (__hash)) && \
464 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \
465 ((__sk)->sk_family == AF_INET6) && \
466 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
467 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
468 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
469
470#endif /* __KERNEL__ */
471
472#endif /* _IPV6_H */