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 __s32 accept_source_route;
181#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
182 __s32 optimistic_dad;
183#endif
184 void *sysctl;
185};
186
187/* index values for the variables in ipv6_devconf */
188enum {
189 DEVCONF_FORWARDING = 0,
190 DEVCONF_HOPLIMIT,
191 DEVCONF_MTU6,
192 DEVCONF_ACCEPT_RA,
193 DEVCONF_ACCEPT_REDIRECTS,
194 DEVCONF_AUTOCONF,
195 DEVCONF_DAD_TRANSMITS,
196 DEVCONF_RTR_SOLICITS,
197 DEVCONF_RTR_SOLICIT_INTERVAL,
198 DEVCONF_RTR_SOLICIT_DELAY,
199 DEVCONF_USE_TEMPADDR,
200 DEVCONF_TEMP_VALID_LFT,
201 DEVCONF_TEMP_PREFERED_LFT,
202 DEVCONF_REGEN_MAX_RETRY,
203 DEVCONF_MAX_DESYNC_FACTOR,
204 DEVCONF_MAX_ADDRESSES,
205 DEVCONF_FORCE_MLD_VERSION,
206 DEVCONF_ACCEPT_RA_DEFRTR,
207 DEVCONF_ACCEPT_RA_PINFO,
208 DEVCONF_ACCEPT_RA_RTR_PREF,
209 DEVCONF_RTR_PROBE_INTERVAL,
210 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
211 DEVCONF_PROXY_NDP,
212 DEVCONF_OPTIMISTIC_DAD,
213 DEVCONF_ACCEPT_SOURCE_ROUTE,
214 DEVCONF_MAX
215};
216
217#ifdef __KERNEL__
218#include <linux/icmpv6.h>
219#include <linux/tcp.h>
220#include <linux/udp.h>
221
222#include <net/if_inet6.h> /* struct ipv6_mc_socklist */
223#include <net/inet_sock.h>
224
225static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
226{
227 return (struct ipv6hdr *)skb_network_header(skb);
228}
229
230static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
231{
232 return (struct ipv6hdr *)skb_transport_header(skb);
233}
234
235/*
236 This structure contains results of exthdrs parsing
237 as offsets from skb->nh.
238 */
239
240struct inet6_skb_parm {
241 int iif;
242 __u16 ra;
243 __u16 hop;
244 __u16 dst0;
245 __u16 srcrt;
246 __u16 dst1;
247 __u16 lastopt;
248 __u32 nhoff;
249 __u16 flags;
250#ifdef CONFIG_IPV6_MIP6
251 __u16 dsthao;
252#endif
253
254#define IP6SKB_XFRM_TRANSFORMED 1
255};
256
257#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
258
259static inline int inet6_iif(const struct sk_buff *skb)
260{
261 return IP6CB(skb)->iif;
262}
263
264struct inet6_request_sock {
265 struct in6_addr loc_addr;
266 struct in6_addr rmt_addr;
267 struct sk_buff *pktopts;
268 int iif;
269};
270
271struct tcp6_request_sock {
272 struct tcp_request_sock tcp6rsk_tcp;
273 struct inet6_request_sock tcp6rsk_inet6;
274};
275
276/**
277 * struct ipv6_pinfo - ipv6 private area
278 *
279 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
280 * this _must_ be the last member, so that inet6_sk_generic
281 * is able to calculate its offset from the base struct sock
282 * by using the struct proto->slab_obj_size member. -acme
283 */
284struct ipv6_pinfo {
285 struct in6_addr saddr;
286 struct in6_addr rcv_saddr;
287 struct in6_addr daddr;
288 struct in6_addr *daddr_cache;
289#ifdef CONFIG_IPV6_SUBTREES
290 struct in6_addr *saddr_cache;
291#endif
292
293 __be32 flow_label;
294 __u32 frag_size;
295 __s16 hop_limit;
296 __s16 mcast_hops;
297 int mcast_oif;
298
299 /* pktoption flags */
300 union {
301 struct {
302 __u16 srcrt:2,
303 osrcrt:2,
304 rxinfo:1,
305 rxoinfo:1,
306 rxhlim:1,
307 rxohlim:1,
308 hopopts:1,
309 ohopopts:1,
310 dstopts:1,
311 odstopts:1,
312 rxflow:1,
313 rxtclass:1;
314 } bits;
315 __u16 all;
316 } rxopt;
317
318 /* sockopt flags */
319 __u8 mc_loop:1,
320 recverr:1,
321 sndflow:1,
322 pmtudisc:2,
323 ipv6only:1;
324 __u8 tclass;
325
326 __u32 dst_cookie;
327
328 struct ipv6_mc_socklist *ipv6_mc_list;
329 struct ipv6_ac_socklist *ipv6_ac_list;
330 struct ipv6_fl_socklist *ipv6_fl_list;
331
332 struct ipv6_txoptions *opt;
333 struct sk_buff *pktoptions;
334 struct {
335 struct ipv6_txoptions *opt;
336 struct rt6_info *rt;
337 int hop_limit;
338 int tclass;
339 } cork;
340};
341
342/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
343struct raw6_sock {
344 /* inet_sock has to be the first member of raw6_sock */
345 struct inet_sock inet;
346 __u32 checksum; /* perform checksum */
347 __u32 offset; /* checksum offset */
348 struct icmp6_filter filter;
349 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
350 struct ipv6_pinfo inet6;
351};
352
353struct udp6_sock {
354 struct udp_sock udp;
355 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
356 struct ipv6_pinfo inet6;
357};
358
359struct tcp6_sock {
360 struct tcp_sock tcp;
361 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
362 struct ipv6_pinfo inet6;
363};
364
365extern int inet6_sk_rebuild_header(struct sock *sk);
366
367#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
368static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
369{
370 return inet_sk(__sk)->pinet6;
371}
372
373static inline struct inet6_request_sock *
374 inet6_rsk(const struct request_sock *rsk)
375{
376 return (struct inet6_request_sock *)(((u8 *)rsk) +
377 inet_rsk(rsk)->inet6_rsk_offset);
378}
379
380static inline u32 inet6_rsk_offset(struct request_sock *rsk)
381{
382 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
383}
384
385static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
386{
387 struct request_sock *req = reqsk_alloc(ops);
388
389 if (req != NULL)
390 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
391
392 return req;
393}
394
395static inline struct raw6_sock *raw6_sk(const struct sock *sk)
396{
397 return (struct raw6_sock *)sk;
398}
399
400static inline void inet_sk_copy_descendant(struct sock *sk_to,
401 const struct sock *sk_from)
402{
403 int ancestor_size = sizeof(struct inet_sock);
404
405 if (sk_from->sk_family == PF_INET6)
406 ancestor_size += sizeof(struct ipv6_pinfo);
407
408 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
409}
410
411#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
412#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
413
414struct inet6_timewait_sock {
415 struct in6_addr tw_v6_daddr;
416 struct in6_addr tw_v6_rcv_saddr;
417};
418
419struct tcp6_timewait_sock {
420 struct tcp_timewait_sock tcp6tw_tcp;
421 struct inet6_timewait_sock tcp6tw_inet6;
422};
423
424static inline u16 inet6_tw_offset(const struct proto *prot)
425{
426 return prot->twsk_prot->twsk_obj_size -
427 sizeof(struct inet6_timewait_sock);
428}
429
430static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
431{
432 return (struct inet6_timewait_sock *)(((u8 *)sk) +
433 inet_twsk(sk)->tw_ipv6_offset);
434}
435
436static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
437{
438 return likely(sk->sk_state != TCP_TIME_WAIT) ?
439 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
440}
441
442static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
443{
444 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
445}
446
447static inline int inet_v6_ipv6only(const struct sock *sk)
448{
449 return likely(sk->sk_state != TCP_TIME_WAIT) ?
450 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
451}
452#else
453#define __ipv6_only_sock(sk) 0
454#define ipv6_only_sock(sk) 0
455
456static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
457{
458 return NULL;
459}
460
461static inline struct inet6_request_sock *
462 inet6_rsk(const struct request_sock *rsk)
463{
464 return NULL;
465}
466
467static inline struct raw6_sock *raw6_sk(const struct sock *sk)
468{
469 return NULL;
470}
471
472#define __inet6_rcv_saddr(__sk) NULL
473#define inet6_rcv_saddr(__sk) NULL
474#define tcp_twsk_ipv6only(__sk) 0
475#define inet_v6_ipv6only(__sk) 0
476#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
477
478#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
479 (((__sk)->sk_hash == (__hash)) && \
480 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \
481 ((__sk)->sk_family == AF_INET6) && \
482 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
483 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
484 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
485
486#endif /* __KERNEL__ */
487
488#endif /* _IPV6_H */