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} __attribute__ ((packed)); /* required for some archs */
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#ifdef CONFIG_IPV6_MROUTE
164 __s32 mc_forwarding;
165#endif
166 void *sysctl;
167};
168
169/* index values for the variables in ipv6_devconf */
170enum {
171 DEVCONF_FORWARDING = 0,
172 DEVCONF_HOPLIMIT,
173 DEVCONF_MTU6,
174 DEVCONF_ACCEPT_RA,
175 DEVCONF_ACCEPT_REDIRECTS,
176 DEVCONF_AUTOCONF,
177 DEVCONF_DAD_TRANSMITS,
178 DEVCONF_RTR_SOLICITS,
179 DEVCONF_RTR_SOLICIT_INTERVAL,
180 DEVCONF_RTR_SOLICIT_DELAY,
181 DEVCONF_USE_TEMPADDR,
182 DEVCONF_TEMP_VALID_LFT,
183 DEVCONF_TEMP_PREFERED_LFT,
184 DEVCONF_REGEN_MAX_RETRY,
185 DEVCONF_MAX_DESYNC_FACTOR,
186 DEVCONF_MAX_ADDRESSES,
187 DEVCONF_FORCE_MLD_VERSION,
188 DEVCONF_ACCEPT_RA_DEFRTR,
189 DEVCONF_ACCEPT_RA_PINFO,
190 DEVCONF_ACCEPT_RA_RTR_PREF,
191 DEVCONF_RTR_PROBE_INTERVAL,
192 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
193 DEVCONF_PROXY_NDP,
194 DEVCONF_OPTIMISTIC_DAD,
195 DEVCONF_ACCEPT_SOURCE_ROUTE,
196 DEVCONF_MC_FORWARDING,
197 DEVCONF_MAX
198};
199
200#ifdef __KERNEL__
201#include <linux/icmpv6.h>
202#include <linux/tcp.h>
203#include <linux/udp.h>
204
205#include <net/inet_sock.h>
206
207static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
208{
209 return (struct ipv6hdr *)skb_network_header(skb);
210}
211
212static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
213{
214 return (struct ipv6hdr *)skb_transport_header(skb);
215}
216
217/*
218 This structure contains results of exthdrs parsing
219 as offsets from skb->nh.
220 */
221
222struct inet6_skb_parm {
223 int iif;
224 __u16 ra;
225 __u16 hop;
226 __u16 dst0;
227 __u16 srcrt;
228 __u16 dst1;
229 __u16 lastopt;
230 __u32 nhoff;
231 __u16 flags;
232#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
233 __u16 dsthao;
234#endif
235
236#define IP6SKB_XFRM_TRANSFORMED 1
237#define IP6SKB_FORWARDED 2
238};
239
240#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
241
242static inline int inet6_iif(const struct sk_buff *skb)
243{
244 return IP6CB(skb)->iif;
245}
246
247struct inet6_request_sock {
248 struct in6_addr loc_addr;
249 struct in6_addr rmt_addr;
250 struct sk_buff *pktopts;
251 int iif;
252};
253
254struct tcp6_request_sock {
255 struct tcp_request_sock tcp6rsk_tcp;
256 struct inet6_request_sock tcp6rsk_inet6;
257};
258
259struct ipv6_mc_socklist;
260struct ipv6_ac_socklist;
261struct ipv6_fl_socklist;
262
263/**
264 * struct ipv6_pinfo - ipv6 private area
265 *
266 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
267 * this _must_ be the last member, so that inet6_sk_generic
268 * is able to calculate its offset from the base struct sock
269 * by using the struct proto->slab_obj_size member. -acme
270 */
271struct ipv6_pinfo {
272 struct in6_addr saddr;
273 struct in6_addr rcv_saddr;
274 struct in6_addr daddr;
275 struct in6_addr *daddr_cache;
276#ifdef CONFIG_IPV6_SUBTREES
277 struct in6_addr *saddr_cache;
278#endif
279
280 __be32 flow_label;
281 __u32 frag_size;
282
283 /*
284 * Packed in 16bits.
285 * Omit one shift by by putting the signed field at MSB.
286 */
287#if defined(__BIG_ENDIAN_BITFIELD)
288 __s16 hop_limit:9;
289 __u16 __unused_1:7;
290#else
291 __u16 __unused_1:7;
292 __s16 hop_limit:9;
293#endif
294
295#if defined(__BIG_ENDIAN_BITFIELD)
296 /* Packed in 16bits. */
297 __s16 mcast_hops:9;
298 __u16 __unused_2:6,
299 mc_loop:1;
300#else
301 __u16 mc_loop:1,
302 __unused_2:6;
303 __s16 mcast_hops:9;
304#endif
305 int mcast_oif;
306
307 /* pktoption flags */
308 union {
309 struct {
310 __u16 srcrt:1,
311 osrcrt:1,
312 rxinfo:1,
313 rxoinfo:1,
314 rxhlim:1,
315 rxohlim:1,
316 hopopts:1,
317 ohopopts:1,
318 dstopts:1,
319 odstopts:1,
320 rxflow:1,
321 rxtclass:1;
322 } bits;
323 __u16 all;
324 } rxopt;
325
326 /* sockopt flags */
327 __u8 recverr:1,
328 sndflow:1,
329 pmtudisc:2,
330 ipv6only:1,
331 srcprefs:3; /* 001: prefer temporary address
332 * 010: prefer public address
333 * 100: prefer care-of address
334 */
335 __u8 tclass;
336
337 __u32 dst_cookie;
338
339 struct ipv6_mc_socklist *ipv6_mc_list;
340 struct ipv6_ac_socklist *ipv6_ac_list;
341 struct ipv6_fl_socklist *ipv6_fl_list;
342
343 struct ipv6_txoptions *opt;
344 struct sk_buff *pktoptions;
345 struct {
346 struct ipv6_txoptions *opt;
347 u8 hop_limit;
348 u8 tclass;
349 } cork;
350};
351
352/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
353struct raw6_sock {
354 /* inet_sock has to be the first member of raw6_sock */
355 struct inet_sock inet;
356 __u32 checksum; /* perform checksum */
357 __u32 offset; /* checksum offset */
358 struct icmp6_filter filter;
359 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
360 struct ipv6_pinfo inet6;
361};
362
363struct udp6_sock {
364 struct udp_sock udp;
365 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
366 struct ipv6_pinfo inet6;
367};
368
369struct tcp6_sock {
370 struct tcp_sock tcp;
371 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
372 struct ipv6_pinfo inet6;
373};
374
375extern int inet6_sk_rebuild_header(struct sock *sk);
376
377#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
378static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
379{
380 return inet_sk(__sk)->pinet6;
381}
382
383static inline struct inet6_request_sock *
384 inet6_rsk(const struct request_sock *rsk)
385{
386 return (struct inet6_request_sock *)(((u8 *)rsk) +
387 inet_rsk(rsk)->inet6_rsk_offset);
388}
389
390static inline u32 inet6_rsk_offset(struct request_sock *rsk)
391{
392 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
393}
394
395static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
396{
397 struct request_sock *req = reqsk_alloc(ops);
398
399 if (req != NULL) {
400 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
401 inet6_rsk(req)->pktopts = NULL;
402 }
403
404 return req;
405}
406
407static inline struct raw6_sock *raw6_sk(const struct sock *sk)
408{
409 return (struct raw6_sock *)sk;
410}
411
412static inline void inet_sk_copy_descendant(struct sock *sk_to,
413 const struct sock *sk_from)
414{
415 int ancestor_size = sizeof(struct inet_sock);
416
417 if (sk_from->sk_family == PF_INET6)
418 ancestor_size += sizeof(struct ipv6_pinfo);
419
420 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
421}
422
423#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
424#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
425
426struct inet6_timewait_sock {
427 struct in6_addr tw_v6_daddr;
428 struct in6_addr tw_v6_rcv_saddr;
429};
430
431struct tcp6_timewait_sock {
432 struct tcp_timewait_sock tcp6tw_tcp;
433 struct inet6_timewait_sock tcp6tw_inet6;
434};
435
436static inline u16 inet6_tw_offset(const struct proto *prot)
437{
438 return prot->twsk_prot->twsk_obj_size -
439 sizeof(struct inet6_timewait_sock);
440}
441
442static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
443{
444 return (struct inet6_timewait_sock *)(((u8 *)sk) +
445 inet_twsk(sk)->tw_ipv6_offset);
446}
447
448static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
449{
450 return likely(sk->sk_state != TCP_TIME_WAIT) ?
451 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
452}
453
454static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
455{
456 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
457}
458
459static inline int inet_v6_ipv6only(const struct sock *sk)
460{
461 return likely(sk->sk_state != TCP_TIME_WAIT) ?
462 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
463}
464#else
465#define __ipv6_only_sock(sk) 0
466#define ipv6_only_sock(sk) 0
467
468static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
469{
470 return NULL;
471}
472
473static inline struct inet6_request_sock *
474 inet6_rsk(const struct request_sock *rsk)
475{
476 return NULL;
477}
478
479static inline struct raw6_sock *raw6_sk(const struct sock *sk)
480{
481 return NULL;
482}
483
484#define __inet6_rcv_saddr(__sk) NULL
485#define inet6_rcv_saddr(__sk) NULL
486#define tcp_twsk_ipv6only(__sk) 0
487#define inet_v6_ipv6only(__sk) 0
488#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
489
490#define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
491 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
492 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \
493 ((__sk)->sk_family == AF_INET6) && \
494 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
495 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
496 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
497
498#define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
499 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
500 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \
501 ((__sk)->sk_family == PF_INET6) && \
502 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \
503 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
504 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
505
506#endif /* __KERNEL__ */
507
508#endif /* _IPV6_H */