Linux kernel mirror (for testing)
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linux
1#ifndef _IPV6_H
2#define _IPV6_H
3
4#include <linux/types.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
24struct ip6_mtuinfo {
25 struct sockaddr_in6 ip6m_addr;
26 __u32 ip6m_mtu;
27};
28
29struct in6_ifreq {
30 struct in6_addr ifr6_addr;
31 __u32 ifr6_prefixlen;
32 int ifr6_ifindex;
33};
34
35#define IPV6_SRCRT_STRICT 0x01 /* Deprecated; will be removed */
36#define IPV6_SRCRT_TYPE_0 0 /* Deprecated; will be removed */
37#define IPV6_SRCRT_TYPE_2 2 /* IPv6 type 2 Routing Header */
38
39/*
40 * routing header
41 */
42struct ipv6_rt_hdr {
43 __u8 nexthdr;
44 __u8 hdrlen;
45 __u8 type;
46 __u8 segments_left;
47
48 /*
49 * type specific data
50 * variable length field
51 */
52};
53
54
55struct ipv6_opt_hdr {
56 __u8 nexthdr;
57 __u8 hdrlen;
58 /*
59 * TLV encoded option data follows.
60 */
61} __attribute__((packed)); /* required for some archs */
62
63#define ipv6_destopt_hdr ipv6_opt_hdr
64#define ipv6_hopopt_hdr ipv6_opt_hdr
65
66#ifdef __KERNEL__
67#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
68#endif
69
70/*
71 * routing header type 0 (used in cmsghdr struct)
72 */
73
74struct rt0_hdr {
75 struct ipv6_rt_hdr rt_hdr;
76 __u32 reserved;
77 struct in6_addr addr[0];
78
79#define rt0_type rt_hdr.type
80};
81
82/*
83 * routing header type 2
84 */
85
86struct rt2_hdr {
87 struct ipv6_rt_hdr rt_hdr;
88 __u32 reserved;
89 struct in6_addr addr;
90
91#define rt2_type rt_hdr.type
92};
93
94/*
95 * home address option in destination options header
96 */
97
98struct ipv6_destopt_hao {
99 __u8 type;
100 __u8 length;
101 struct in6_addr addr;
102} __attribute__((packed));
103
104/*
105 * IPv6 fixed header
106 *
107 * BEWARE, it is incorrect. The first 4 bits of flow_lbl
108 * are glued to priority now, forming "class".
109 */
110
111struct ipv6hdr {
112#if defined(__LITTLE_ENDIAN_BITFIELD)
113 __u8 priority:4,
114 version:4;
115#elif defined(__BIG_ENDIAN_BITFIELD)
116 __u8 version:4,
117 priority:4;
118#else
119#error "Please fix <asm/byteorder.h>"
120#endif
121 __u8 flow_lbl[3];
122
123 __be16 payload_len;
124 __u8 nexthdr;
125 __u8 hop_limit;
126
127 struct in6_addr saddr;
128 struct in6_addr daddr;
129};
130
131#ifdef __KERNEL__
132/*
133 * This structure contains configuration options per IPv6 link.
134 */
135struct ipv6_devconf {
136 __s32 forwarding;
137 __s32 hop_limit;
138 __s32 mtu6;
139 __s32 accept_ra;
140 __s32 accept_redirects;
141 __s32 autoconf;
142 __s32 dad_transmits;
143 __s32 rtr_solicits;
144 __s32 rtr_solicit_interval;
145 __s32 rtr_solicit_delay;
146 __s32 force_mld_version;
147#ifdef CONFIG_IPV6_PRIVACY
148 __s32 use_tempaddr;
149 __s32 temp_valid_lft;
150 __s32 temp_prefered_lft;
151 __s32 regen_max_retry;
152 __s32 max_desync_factor;
153#endif
154 __s32 max_addresses;
155 __s32 accept_ra_defrtr;
156 __s32 accept_ra_pinfo;
157#ifdef CONFIG_IPV6_ROUTER_PREF
158 __s32 accept_ra_rtr_pref;
159 __s32 rtr_probe_interval;
160#ifdef CONFIG_IPV6_ROUTE_INFO
161 __s32 accept_ra_rt_info_max_plen;
162#endif
163#endif
164 __s32 proxy_ndp;
165 __s32 accept_source_route;
166#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
167 __s32 optimistic_dad;
168#endif
169#ifdef CONFIG_IPV6_MROUTE
170 __s32 mc_forwarding;
171#endif
172 __s32 disable_ipv6;
173 __s32 accept_dad;
174 __s32 force_tllao;
175 void *sysctl;
176};
177
178struct ipv6_params {
179 __s32 disable_ipv6;
180 __s32 autoconf;
181};
182extern struct ipv6_params ipv6_defaults;
183#endif
184
185/* index values for the variables in ipv6_devconf */
186enum {
187 DEVCONF_FORWARDING = 0,
188 DEVCONF_HOPLIMIT,
189 DEVCONF_MTU6,
190 DEVCONF_ACCEPT_RA,
191 DEVCONF_ACCEPT_REDIRECTS,
192 DEVCONF_AUTOCONF,
193 DEVCONF_DAD_TRANSMITS,
194 DEVCONF_RTR_SOLICITS,
195 DEVCONF_RTR_SOLICIT_INTERVAL,
196 DEVCONF_RTR_SOLICIT_DELAY,
197 DEVCONF_USE_TEMPADDR,
198 DEVCONF_TEMP_VALID_LFT,
199 DEVCONF_TEMP_PREFERED_LFT,
200 DEVCONF_REGEN_MAX_RETRY,
201 DEVCONF_MAX_DESYNC_FACTOR,
202 DEVCONF_MAX_ADDRESSES,
203 DEVCONF_FORCE_MLD_VERSION,
204 DEVCONF_ACCEPT_RA_DEFRTR,
205 DEVCONF_ACCEPT_RA_PINFO,
206 DEVCONF_ACCEPT_RA_RTR_PREF,
207 DEVCONF_RTR_PROBE_INTERVAL,
208 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
209 DEVCONF_PROXY_NDP,
210 DEVCONF_OPTIMISTIC_DAD,
211 DEVCONF_ACCEPT_SOURCE_ROUTE,
212 DEVCONF_MC_FORWARDING,
213 DEVCONF_DISABLE_IPV6,
214 DEVCONF_ACCEPT_DAD,
215 DEVCONF_FORCE_TLLAO,
216 DEVCONF_MAX
217};
218
219#ifdef __KERNEL__
220#include <linux/icmpv6.h>
221#include <linux/tcp.h>
222#include <linux/udp.h>
223
224#include <net/inet_sock.h>
225
226static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
227{
228 return (struct ipv6hdr *)skb_network_header(skb);
229}
230
231static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
232{
233 return (struct ipv6hdr *)skb_transport_header(skb);
234}
235
236static inline __u8 ipv6_tclass(const struct ipv6hdr *iph)
237{
238 return (ntohl(*(__be32 *)iph) >> 20) & 0xff;
239}
240
241/*
242 This structure contains results of exthdrs parsing
243 as offsets from skb->nh.
244 */
245
246struct inet6_skb_parm {
247 int iif;
248 __u16 ra;
249 __u16 hop;
250 __u16 dst0;
251 __u16 srcrt;
252 __u16 dst1;
253 __u16 lastopt;
254 __u16 nhoff;
255 __u16 flags;
256#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
257 __u16 dsthao;
258#endif
259
260#define IP6SKB_XFRM_TRANSFORMED 1
261#define IP6SKB_FORWARDED 2
262#define IP6SKB_REROUTED 4
263};
264
265#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
266#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
267
268static inline int inet6_iif(const struct sk_buff *skb)
269{
270 return IP6CB(skb)->iif;
271}
272
273struct inet6_request_sock {
274 struct in6_addr loc_addr;
275 struct in6_addr rmt_addr;
276 struct sk_buff *pktopts;
277 int iif;
278};
279
280struct tcp6_request_sock {
281 struct tcp_request_sock tcp6rsk_tcp;
282 struct inet6_request_sock tcp6rsk_inet6;
283};
284
285struct ipv6_mc_socklist;
286struct ipv6_ac_socklist;
287struct ipv6_fl_socklist;
288
289/**
290 * struct ipv6_pinfo - ipv6 private area
291 *
292 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
293 * this _must_ be the last member, so that inet6_sk_generic
294 * is able to calculate its offset from the base struct sock
295 * by using the struct proto->slab_obj_size member. -acme
296 */
297struct ipv6_pinfo {
298 struct in6_addr saddr;
299 struct in6_addr rcv_saddr;
300 struct in6_addr daddr;
301 struct in6_pktinfo sticky_pktinfo;
302 struct in6_addr *daddr_cache;
303#ifdef CONFIG_IPV6_SUBTREES
304 struct in6_addr *saddr_cache;
305#endif
306
307 __be32 flow_label;
308 __u32 frag_size;
309
310 /*
311 * Packed in 16bits.
312 * Omit one shift by by putting the signed field at MSB.
313 */
314#if defined(__BIG_ENDIAN_BITFIELD)
315 __s16 hop_limit:9;
316 __u16 __unused_1:7;
317#else
318 __u16 __unused_1:7;
319 __s16 hop_limit:9;
320#endif
321
322#if defined(__BIG_ENDIAN_BITFIELD)
323 /* Packed in 16bits. */
324 __s16 mcast_hops:9;
325 __u16 __unused_2:6,
326 mc_loop:1;
327#else
328 __u16 mc_loop:1,
329 __unused_2:6;
330 __s16 mcast_hops:9;
331#endif
332 int ucast_oif;
333 int mcast_oif;
334
335 /* pktoption flags */
336 union {
337 struct {
338 __u16 srcrt:1,
339 osrcrt:1,
340 rxinfo:1,
341 rxoinfo:1,
342 rxhlim:1,
343 rxohlim:1,
344 hopopts:1,
345 ohopopts:1,
346 dstopts:1,
347 odstopts:1,
348 rxflow:1,
349 rxtclass:1,
350 rxpmtu:1,
351 rxorigdstaddr:1;
352 /* 2 bits hole */
353 } bits;
354 __u16 all;
355 } rxopt;
356
357 /* sockopt flags */
358 __u16 recverr:1,
359 sndflow:1,
360 pmtudisc:2,
361 ipv6only:1,
362 srcprefs:3, /* 001: prefer temporary address
363 * 010: prefer public address
364 * 100: prefer care-of address
365 */
366 dontfrag:1;
367 __u8 min_hopcount;
368 __u8 tclass;
369 __u8 rcv_tclass;
370
371 __u32 dst_cookie;
372
373 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
374 struct ipv6_ac_socklist *ipv6_ac_list;
375 struct ipv6_fl_socklist *ipv6_fl_list;
376
377 struct ipv6_txoptions *opt;
378 struct sk_buff *pktoptions;
379 struct sk_buff *rxpmtu;
380 struct {
381 struct ipv6_txoptions *opt;
382 u8 hop_limit;
383 u8 tclass;
384 } cork;
385};
386
387/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
388struct raw6_sock {
389 /* inet_sock has to be the first member of raw6_sock */
390 struct inet_sock inet;
391 __u32 checksum; /* perform checksum */
392 __u32 offset; /* checksum offset */
393 struct icmp6_filter filter;
394 __u32 ip6mr_table;
395 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
396 struct ipv6_pinfo inet6;
397};
398
399struct udp6_sock {
400 struct udp_sock udp;
401 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
402 struct ipv6_pinfo inet6;
403};
404
405struct tcp6_sock {
406 struct tcp_sock tcp;
407 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
408 struct ipv6_pinfo inet6;
409};
410
411extern int inet6_sk_rebuild_header(struct sock *sk);
412
413#if IS_ENABLED(CONFIG_IPV6)
414static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
415{
416 return inet_sk(__sk)->pinet6;
417}
418
419static inline struct inet6_request_sock *
420 inet6_rsk(const struct request_sock *rsk)
421{
422 return (struct inet6_request_sock *)(((u8 *)rsk) +
423 inet_rsk(rsk)->inet6_rsk_offset);
424}
425
426static inline u32 inet6_rsk_offset(struct request_sock *rsk)
427{
428 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
429}
430
431static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
432{
433 struct request_sock *req = reqsk_alloc(ops);
434
435 if (req != NULL) {
436 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
437 inet6_rsk(req)->pktopts = NULL;
438 }
439
440 return req;
441}
442
443static inline struct raw6_sock *raw6_sk(const struct sock *sk)
444{
445 return (struct raw6_sock *)sk;
446}
447
448static inline void inet_sk_copy_descendant(struct sock *sk_to,
449 const struct sock *sk_from)
450{
451 int ancestor_size = sizeof(struct inet_sock);
452
453 if (sk_from->sk_family == PF_INET6)
454 ancestor_size += sizeof(struct ipv6_pinfo);
455
456 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
457}
458
459#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
460#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
461
462struct inet6_timewait_sock {
463 struct in6_addr tw_v6_daddr;
464 struct in6_addr tw_v6_rcv_saddr;
465};
466
467struct tcp6_timewait_sock {
468 struct tcp_timewait_sock tcp6tw_tcp;
469 struct inet6_timewait_sock tcp6tw_inet6;
470};
471
472static inline u16 inet6_tw_offset(const struct proto *prot)
473{
474 return prot->twsk_prot->twsk_obj_size -
475 sizeof(struct inet6_timewait_sock);
476}
477
478static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
479{
480 return (struct inet6_timewait_sock *)(((u8 *)sk) +
481 inet_twsk(sk)->tw_ipv6_offset);
482}
483
484static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
485{
486 return likely(sk->sk_state != TCP_TIME_WAIT) ?
487 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
488}
489
490static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
491{
492 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
493}
494
495static inline int inet_v6_ipv6only(const struct sock *sk)
496{
497 return likely(sk->sk_state != TCP_TIME_WAIT) ?
498 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
499}
500#else
501#define __ipv6_only_sock(sk) 0
502#define ipv6_only_sock(sk) 0
503
504static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
505{
506 return NULL;
507}
508
509static inline struct inet6_request_sock *
510 inet6_rsk(const struct request_sock *rsk)
511{
512 return NULL;
513}
514
515static inline struct raw6_sock *raw6_sk(const struct sock *sk)
516{
517 return NULL;
518}
519
520#define __inet6_rcv_saddr(__sk) NULL
521#define inet6_rcv_saddr(__sk) NULL
522#define tcp_twsk_ipv6only(__sk) 0
523#define inet_v6_ipv6only(__sk) 0
524#endif /* IS_ENABLED(CONFIG_IPV6) */
525
526#define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
527 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
528 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
529 ((__sk)->sk_family == AF_INET6) && \
530 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
531 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
532 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
533
534#define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
535 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
536 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \
537 ((__sk)->sk_family == PF_INET6) && \
538 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \
539 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
540 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
541
542#endif /* __KERNEL__ */
543
544#endif /* _IPV6_H */