Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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 __s32 accept_ra_defrtr;
149 __s32 accept_ra_pinfo;
150#ifdef CONFIG_IPV6_ROUTER_PREF
151 __s32 accept_ra_rtr_pref;
152 __s32 rtr_probe_interval;
153#ifdef CONFIG_IPV6_ROUTE_INFO
154 __s32 accept_ra_rt_info_max_plen;
155#endif
156#endif
157 void *sysctl;
158};
159
160/* index values for the variables in ipv6_devconf */
161enum {
162 DEVCONF_FORWARDING = 0,
163 DEVCONF_HOPLIMIT,
164 DEVCONF_MTU6,
165 DEVCONF_ACCEPT_RA,
166 DEVCONF_ACCEPT_REDIRECTS,
167 DEVCONF_AUTOCONF,
168 DEVCONF_DAD_TRANSMITS,
169 DEVCONF_RTR_SOLICITS,
170 DEVCONF_RTR_SOLICIT_INTERVAL,
171 DEVCONF_RTR_SOLICIT_DELAY,
172 DEVCONF_USE_TEMPADDR,
173 DEVCONF_TEMP_VALID_LFT,
174 DEVCONF_TEMP_PREFERED_LFT,
175 DEVCONF_REGEN_MAX_RETRY,
176 DEVCONF_MAX_DESYNC_FACTOR,
177 DEVCONF_MAX_ADDRESSES,
178 DEVCONF_FORCE_MLD_VERSION,
179 DEVCONF_ACCEPT_RA_DEFRTR,
180 DEVCONF_ACCEPT_RA_PINFO,
181 DEVCONF_ACCEPT_RA_RTR_PREF,
182 DEVCONF_RTR_PROBE_INTERVAL,
183 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
184 DEVCONF_MAX
185};
186
187#ifdef __KERNEL__
188#include <linux/icmpv6.h>
189#include <linux/tcp.h>
190#include <linux/udp.h>
191
192#include <net/if_inet6.h> /* struct ipv6_mc_socklist */
193#include <net/inet_sock.h>
194
195/*
196 This structure contains results of exthdrs parsing
197 as offsets from skb->nh.
198 */
199
200struct inet6_skb_parm {
201 int iif;
202 __u16 ra;
203 __u16 hop;
204 __u16 dst0;
205 __u16 srcrt;
206 __u16 dst1;
207 __u16 lastopt;
208 __u32 nhoff;
209 __u16 flags;
210
211#define IP6SKB_XFRM_TRANSFORMED 1
212};
213
214#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
215
216static inline int inet6_iif(const struct sk_buff *skb)
217{
218 return IP6CB(skb)->iif;
219}
220
221struct inet6_request_sock {
222 struct in6_addr loc_addr;
223 struct in6_addr rmt_addr;
224 struct sk_buff *pktopts;
225 int iif;
226};
227
228struct tcp6_request_sock {
229 struct tcp_request_sock tcp6rsk_tcp;
230 struct inet6_request_sock tcp6rsk_inet6;
231};
232
233/**
234 * struct ipv6_pinfo - ipv6 private area
235 *
236 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
237 * this _must_ be the last member, so that inet6_sk_generic
238 * is able to calculate its offset from the base struct sock
239 * by using the struct proto->slab_obj_size member. -acme
240 */
241struct ipv6_pinfo {
242 struct in6_addr saddr;
243 struct in6_addr rcv_saddr;
244 struct in6_addr daddr;
245 struct in6_addr *daddr_cache;
246
247 __u32 flow_label;
248 __u32 frag_size;
249 __s16 hop_limit;
250 __s16 mcast_hops;
251 int mcast_oif;
252
253 /* pktoption flags */
254 union {
255 struct {
256 __u16 srcrt:2,
257 osrcrt:2,
258 rxinfo:1,
259 rxoinfo:1,
260 rxhlim:1,
261 rxohlim:1,
262 hopopts:1,
263 ohopopts:1,
264 dstopts:1,
265 odstopts:1,
266 rxflow:1,
267 rxtclass:1;
268 } bits;
269 __u16 all;
270 } rxopt;
271
272 /* sockopt flags */
273 __u8 mc_loop:1,
274 recverr:1,
275 sndflow:1,
276 pmtudisc:2,
277 ipv6only:1;
278 __u8 tclass;
279
280 __u32 dst_cookie;
281
282 struct ipv6_mc_socklist *ipv6_mc_list;
283 struct ipv6_ac_socklist *ipv6_ac_list;
284 struct ipv6_fl_socklist *ipv6_fl_list;
285
286 struct ipv6_txoptions *opt;
287 struct sk_buff *pktoptions;
288 struct {
289 struct ipv6_txoptions *opt;
290 struct rt6_info *rt;
291 int hop_limit;
292 int tclass;
293 } cork;
294};
295
296/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
297struct raw6_sock {
298 /* inet_sock has to be the first member of raw6_sock */
299 struct inet_sock inet;
300 __u32 checksum; /* perform checksum */
301 __u32 offset; /* checksum offset */
302 struct icmp6_filter filter;
303 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
304 struct ipv6_pinfo inet6;
305};
306
307struct udp6_sock {
308 struct udp_sock udp;
309 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
310 struct ipv6_pinfo inet6;
311};
312
313struct tcp6_sock {
314 struct tcp_sock tcp;
315 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
316 struct ipv6_pinfo inet6;
317};
318
319extern int inet6_sk_rebuild_header(struct sock *sk);
320
321#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
322static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
323{
324 return inet_sk(__sk)->pinet6;
325}
326
327static inline struct inet6_request_sock *
328 inet6_rsk(const struct request_sock *rsk)
329{
330 return (struct inet6_request_sock *)(((u8 *)rsk) +
331 inet_rsk(rsk)->inet6_rsk_offset);
332}
333
334static inline u32 inet6_rsk_offset(struct request_sock *rsk)
335{
336 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
337}
338
339static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
340{
341 struct request_sock *req = reqsk_alloc(ops);
342
343 if (req != NULL)
344 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
345
346 return req;
347}
348
349static inline struct raw6_sock *raw6_sk(const struct sock *sk)
350{
351 return (struct raw6_sock *)sk;
352}
353
354static inline void inet_sk_copy_descendant(struct sock *sk_to,
355 const struct sock *sk_from)
356{
357 int ancestor_size = sizeof(struct inet_sock);
358
359 if (sk_from->sk_family == PF_INET6)
360 ancestor_size += sizeof(struct ipv6_pinfo);
361
362 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
363}
364
365#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
366#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
367
368struct inet6_timewait_sock {
369 struct in6_addr tw_v6_daddr;
370 struct in6_addr tw_v6_rcv_saddr;
371};
372
373struct tcp6_timewait_sock {
374 struct tcp_timewait_sock tcp6tw_tcp;
375 struct inet6_timewait_sock tcp6tw_inet6;
376};
377
378static inline u16 inet6_tw_offset(const struct proto *prot)
379{
380 return prot->twsk_prot->twsk_obj_size -
381 sizeof(struct inet6_timewait_sock);
382}
383
384static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
385{
386 return (struct inet6_timewait_sock *)(((u8 *)sk) +
387 inet_twsk(sk)->tw_ipv6_offset);
388}
389
390static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
391{
392 return likely(sk->sk_state != TCP_TIME_WAIT) ?
393 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
394}
395
396static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
397{
398 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
399}
400
401static inline int inet_v6_ipv6only(const struct sock *sk)
402{
403 return likely(sk->sk_state != TCP_TIME_WAIT) ?
404 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
405}
406#else
407#define __ipv6_only_sock(sk) 0
408#define ipv6_only_sock(sk) 0
409
410static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
411{
412 return NULL;
413}
414
415static inline struct inet6_request_sock *
416 inet6_rsk(const struct request_sock *rsk)
417{
418 return NULL;
419}
420
421static inline struct raw6_sock *raw6_sk(const struct sock *sk)
422{
423 return NULL;
424}
425
426#define __inet6_rcv_saddr(__sk) NULL
427#define inet6_rcv_saddr(__sk) NULL
428#define tcp_twsk_ipv6only(__sk) 0
429#define inet_v6_ipv6only(__sk) 0
430#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
431
432#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
433 (((__sk)->sk_hash == (__hash)) && \
434 ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \
435 ((__sk)->sk_family == AF_INET6) && \
436 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
437 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
438 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
439
440#endif /* __KERNEL__ */
441
442#endif /* _IPV6_H */