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
19 struct in6_pktinfo {
20 struct in6_addr ipi6_addr;
21 int ipi6_ifindex;
22 };
23
24 struct ip6_mtuinfo {
25 struct sockaddr_in6 ip6m_addr;
26 __u32 ip6m_mtu;
27 };
28
29 struct 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 */
42 struct 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
55 struct 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
74 struct 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
86 struct 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
98 struct 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
111 struct 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 */
135 struct 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
178 struct ipv6_params {
179 __s32 disable_ipv6;
180 __s32 autoconf;
181 };
182 extern struct ipv6_params ipv6_defaults;
183 #endif
184
185 /* index values for the variables in ipv6_devconf */
186 enum {
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
ipv6_hdr(const struct sk_buff * skb)226 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
227 {
228 return (struct ipv6hdr *)skb_network_header(skb);
229 }
230
ipipv6_hdr(const struct sk_buff * skb)231 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
232 {
233 return (struct ipv6hdr *)skb_transport_header(skb);
234 }
235
ipv6_tclass(const struct ipv6hdr * iph)236 static 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
246 struct 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 #define IP6SKB_FRAGMENTED 16
264 };
265
266 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
267 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
268
inet6_iif(const struct sk_buff * skb)269 static inline int inet6_iif(const struct sk_buff *skb)
270 {
271 return IP6CB(skb)->iif;
272 }
273
274 struct inet6_request_sock {
275 struct in6_addr loc_addr;
276 struct in6_addr rmt_addr;
277 struct sk_buff *pktopts;
278 int iif;
279 };
280
281 struct tcp6_request_sock {
282 struct tcp_request_sock tcp6rsk_tcp;
283 struct inet6_request_sock tcp6rsk_inet6;
284 };
285
286 struct ipv6_mc_socklist;
287 struct ipv6_ac_socklist;
288 struct ipv6_fl_socklist;
289
290 /**
291 * struct ipv6_pinfo - ipv6 private area
292 *
293 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
294 * this _must_ be the last member, so that inet6_sk_generic
295 * is able to calculate its offset from the base struct sock
296 * by using the struct proto->slab_obj_size member. -acme
297 */
298 struct ipv6_pinfo {
299 struct in6_addr saddr;
300 struct in6_addr rcv_saddr;
301 struct in6_addr daddr;
302 struct in6_pktinfo sticky_pktinfo;
303 struct in6_addr *daddr_cache;
304 #ifdef CONFIG_IPV6_SUBTREES
305 struct in6_addr *saddr_cache;
306 #endif
307
308 __be32 flow_label;
309 __u32 frag_size;
310
311 /*
312 * Packed in 16bits.
313 * Omit one shift by by putting the signed field at MSB.
314 */
315 #if defined(__BIG_ENDIAN_BITFIELD)
316 __s16 hop_limit:9;
317 __u16 __unused_1:7;
318 #else
319 __u16 __unused_1:7;
320 __s16 hop_limit:9;
321 #endif
322
323 #if defined(__BIG_ENDIAN_BITFIELD)
324 /* Packed in 16bits. */
325 __s16 mcast_hops:9;
326 __u16 __unused_2:6,
327 mc_loop:1;
328 #else
329 __u16 mc_loop:1,
330 __unused_2:6;
331 __s16 mcast_hops:9;
332 #endif
333 int ucast_oif;
334 int mcast_oif;
335
336 /* pktoption flags */
337 union {
338 struct {
339 __u16 srcrt:1,
340 osrcrt:1,
341 rxinfo:1,
342 rxoinfo:1,
343 rxhlim:1,
344 rxohlim:1,
345 hopopts:1,
346 ohopopts:1,
347 dstopts:1,
348 odstopts:1,
349 rxflow:1,
350 rxtclass:1,
351 rxpmtu:1,
352 rxorigdstaddr:1;
353 /* 2 bits hole */
354 } bits;
355 __u16 all;
356 } rxopt;
357
358 /* sockopt flags */
359 __u16 recverr:1,
360 sndflow:1,
361 pmtudisc:2,
362 ipv6only:1,
363 srcprefs:3, /* 001: prefer temporary address
364 * 010: prefer public address
365 * 100: prefer care-of address
366 */
367 dontfrag:1;
368 __u8 min_hopcount;
369 __u8 tclass;
370 __u8 rcv_tclass;
371
372 __u32 dst_cookie;
373
374 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
375 struct ipv6_ac_socklist *ipv6_ac_list;
376 struct ipv6_fl_socklist *ipv6_fl_list;
377
378 struct ipv6_txoptions *opt;
379 struct sk_buff *pktoptions;
380 struct sk_buff *rxpmtu;
381 struct {
382 struct ipv6_txoptions *opt;
383 u8 hop_limit;
384 u8 tclass;
385 } cork;
386 };
387
388 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
389 struct raw6_sock {
390 /* inet_sock has to be the first member of raw6_sock */
391 struct inet_sock inet;
392 __u32 checksum; /* perform checksum */
393 __u32 offset; /* checksum offset */
394 struct icmp6_filter filter;
395 __u32 ip6mr_table;
396 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
397 struct ipv6_pinfo inet6;
398 };
399
400 struct udp6_sock {
401 struct udp_sock udp;
402 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
403 struct ipv6_pinfo inet6;
404 };
405
406 struct tcp6_sock {
407 struct tcp_sock tcp;
408 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
409 struct ipv6_pinfo inet6;
410 };
411
412 extern int inet6_sk_rebuild_header(struct sock *sk);
413
414 #if IS_ENABLED(CONFIG_IPV6)
inet6_sk(const struct sock * __sk)415 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
416 {
417 return inet_sk(__sk)->pinet6;
418 }
419
420 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)421 inet6_rsk(const struct request_sock *rsk)
422 {
423 return (struct inet6_request_sock *)(((u8 *)rsk) +
424 inet_rsk(rsk)->inet6_rsk_offset);
425 }
426
inet6_rsk_offset(struct request_sock * rsk)427 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
428 {
429 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
430 }
431
inet6_reqsk_alloc(struct request_sock_ops * ops)432 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
433 {
434 struct request_sock *req = reqsk_alloc(ops);
435
436 if (req != NULL) {
437 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
438 inet6_rsk(req)->pktopts = NULL;
439 }
440
441 return req;
442 }
443
raw6_sk(const struct sock * sk)444 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
445 {
446 return (struct raw6_sock *)sk;
447 }
448
inet_sk_copy_descendant(struct sock * sk_to,const struct sock * sk_from)449 static inline void inet_sk_copy_descendant(struct sock *sk_to,
450 const struct sock *sk_from)
451 {
452 int ancestor_size = sizeof(struct inet_sock);
453
454 if (sk_from->sk_family == PF_INET6)
455 ancestor_size += sizeof(struct ipv6_pinfo);
456
457 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
458 }
459
460 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
461 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
462
463 struct inet6_timewait_sock {
464 struct in6_addr tw_v6_daddr;
465 struct in6_addr tw_v6_rcv_saddr;
466 };
467
468 struct tcp6_timewait_sock {
469 struct tcp_timewait_sock tcp6tw_tcp;
470 struct inet6_timewait_sock tcp6tw_inet6;
471 };
472
inet6_tw_offset(const struct proto * prot)473 static inline u16 inet6_tw_offset(const struct proto *prot)
474 {
475 return prot->twsk_prot->twsk_obj_size -
476 sizeof(struct inet6_timewait_sock);
477 }
478
inet6_twsk(const struct sock * sk)479 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
480 {
481 return (struct inet6_timewait_sock *)(((u8 *)sk) +
482 inet_twsk(sk)->tw_ipv6_offset);
483 }
484
__inet6_rcv_saddr(const struct sock * sk)485 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
486 {
487 return likely(sk->sk_state != TCP_TIME_WAIT) ?
488 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
489 }
490
inet6_rcv_saddr(const struct sock * sk)491 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
492 {
493 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
494 }
495
inet_v6_ipv6only(const struct sock * sk)496 static inline int inet_v6_ipv6only(const struct sock *sk)
497 {
498 return likely(sk->sk_state != TCP_TIME_WAIT) ?
499 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
500 }
501 #else
502 #define __ipv6_only_sock(sk) 0
503 #define ipv6_only_sock(sk) 0
504
inet6_sk(const struct sock * __sk)505 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
506 {
507 return NULL;
508 }
509
510 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)511 inet6_rsk(const struct request_sock *rsk)
512 {
513 return NULL;
514 }
515
raw6_sk(const struct sock * sk)516 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
517 {
518 return NULL;
519 }
520
521 #define __inet6_rcv_saddr(__sk) NULL
522 #define inet6_rcv_saddr(__sk) NULL
523 #define tcp_twsk_ipv6only(__sk) 0
524 #define inet_v6_ipv6only(__sk) 0
525 #endif /* IS_ENABLED(CONFIG_IPV6) */
526
527 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
528 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
529 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
530 ((__sk)->sk_family == AF_INET6) && \
531 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
532 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
533 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
534
535 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
536 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
537 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \
538 ((__sk)->sk_family == PF_INET6) && \
539 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \
540 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
541 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
542
543 #endif /* __KERNEL__ */
544
545 #endif /* _IPV6_H */
546