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 accept_ra_rt_table;
165 __s32 proxy_ndp;
166 __s32 accept_source_route;
167 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
168 __s32 optimistic_dad;
169 __s32 use_optimistic;
170 #endif
171 #ifdef CONFIG_IPV6_MROUTE
172 __s32 mc_forwarding;
173 #endif
174 __s32 disable_ipv6;
175 __s32 accept_dad;
176 __s32 force_tllao;
177 __s32 use_oif_addrs_only;
178 void *sysctl;
179 };
180
181 struct ipv6_params {
182 __s32 disable_ipv6;
183 __s32 autoconf;
184 };
185 extern struct ipv6_params ipv6_defaults;
186 #endif
187
188 /* index values for the variables in ipv6_devconf */
189 enum {
190 DEVCONF_FORWARDING = 0,
191 DEVCONF_HOPLIMIT,
192 DEVCONF_MTU6,
193 DEVCONF_ACCEPT_RA,
194 DEVCONF_ACCEPT_REDIRECTS,
195 DEVCONF_AUTOCONF,
196 DEVCONF_DAD_TRANSMITS,
197 DEVCONF_RTR_SOLICITS,
198 DEVCONF_RTR_SOLICIT_INTERVAL,
199 DEVCONF_RTR_SOLICIT_DELAY,
200 DEVCONF_USE_TEMPADDR,
201 DEVCONF_TEMP_VALID_LFT,
202 DEVCONF_TEMP_PREFERED_LFT,
203 DEVCONF_REGEN_MAX_RETRY,
204 DEVCONF_MAX_DESYNC_FACTOR,
205 DEVCONF_MAX_ADDRESSES,
206 DEVCONF_FORCE_MLD_VERSION,
207 DEVCONF_ACCEPT_RA_DEFRTR,
208 DEVCONF_ACCEPT_RA_PINFO,
209 DEVCONF_ACCEPT_RA_RTR_PREF,
210 DEVCONF_RTR_PROBE_INTERVAL,
211 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
212 DEVCONF_PROXY_NDP,
213 DEVCONF_OPTIMISTIC_DAD,
214 DEVCONF_ACCEPT_SOURCE_ROUTE,
215 DEVCONF_MC_FORWARDING,
216 DEVCONF_DISABLE_IPV6,
217 DEVCONF_ACCEPT_DAD,
218 DEVCONF_FORCE_TLLAO,
219 DEVCONF_ACCEPT_RA_RT_TABLE,
220 DEVCONF_USE_OPTIMISTIC,
221 DEVCONF_USE_OIF_ADDRS_ONLY,
222 DEVCONF_MAX
223 };
224
225 #ifdef __KERNEL__
226 #include <linux/icmpv6.h>
227 #include <linux/tcp.h>
228 #include <linux/udp.h>
229
230 #include <net/inet_sock.h>
231
ipv6_hdr(const struct sk_buff * skb)232 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
233 {
234 return (struct ipv6hdr *)skb_network_header(skb);
235 }
236
ipipv6_hdr(const struct sk_buff * skb)237 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
238 {
239 return (struct ipv6hdr *)skb_transport_header(skb);
240 }
241
ipv6_tclass(const struct ipv6hdr * iph)242 static inline __u8 ipv6_tclass(const struct ipv6hdr *iph)
243 {
244 return (ntohl(*(__be32 *)iph) >> 20) & 0xff;
245 }
246
247 /*
248 This structure contains results of exthdrs parsing
249 as offsets from skb->nh.
250 */
251
252 struct inet6_skb_parm {
253 int iif;
254 __u16 ra;
255 __u16 hop;
256 __u16 dst0;
257 __u16 srcrt;
258 __u16 dst1;
259 __u16 lastopt;
260 __u16 nhoff;
261 __u16 flags;
262 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
263 __u16 dsthao;
264 #endif
265
266 #define IP6SKB_XFRM_TRANSFORMED 1
267 #define IP6SKB_FORWARDED 2
268 #define IP6SKB_REROUTED 4
269 #define IP6SKB_FRAGMENTED 16
270 };
271
272 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
273 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
274
inet6_iif(const struct sk_buff * skb)275 static inline int inet6_iif(const struct sk_buff *skb)
276 {
277 return IP6CB(skb)->iif;
278 }
279
280 struct inet6_request_sock {
281 struct in6_addr loc_addr;
282 struct in6_addr rmt_addr;
283 struct sk_buff *pktopts;
284 int iif;
285 };
286
287 struct tcp6_request_sock {
288 struct tcp_request_sock tcp6rsk_tcp;
289 struct inet6_request_sock tcp6rsk_inet6;
290 };
291
292 struct ipv6_mc_socklist;
293 struct ipv6_ac_socklist;
294 struct ipv6_fl_socklist;
295
296 /**
297 * struct ipv6_pinfo - ipv6 private area
298 *
299 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
300 * this _must_ be the last member, so that inet6_sk_generic
301 * is able to calculate its offset from the base struct sock
302 * by using the struct proto->slab_obj_size member. -acme
303 */
304 struct ipv6_pinfo {
305 struct in6_addr saddr;
306 struct in6_addr rcv_saddr;
307 struct in6_addr daddr;
308 struct in6_pktinfo sticky_pktinfo;
309 struct in6_addr *daddr_cache;
310 #ifdef CONFIG_IPV6_SUBTREES
311 struct in6_addr *saddr_cache;
312 #endif
313
314 __be32 flow_label;
315 __u32 frag_size;
316
317 /*
318 * Packed in 16bits.
319 * Omit one shift by by putting the signed field at MSB.
320 */
321 #if defined(__BIG_ENDIAN_BITFIELD)
322 __s16 hop_limit:9;
323 __u16 __unused_1:7;
324 #else
325 __u16 __unused_1:7;
326 __s16 hop_limit:9;
327 #endif
328
329 #if defined(__BIG_ENDIAN_BITFIELD)
330 /* Packed in 16bits. */
331 __s16 mcast_hops:9;
332 __u16 __unused_2:6,
333 mc_loop:1;
334 #else
335 __u16 mc_loop:1,
336 __unused_2:6;
337 __s16 mcast_hops:9;
338 #endif
339 int ucast_oif;
340 int mcast_oif;
341
342 /* pktoption flags */
343 union {
344 struct {
345 __u16 srcrt:1,
346 osrcrt:1,
347 rxinfo:1,
348 rxoinfo:1,
349 rxhlim:1,
350 rxohlim:1,
351 hopopts:1,
352 ohopopts:1,
353 dstopts:1,
354 odstopts:1,
355 rxflow:1,
356 rxtclass:1,
357 rxpmtu:1,
358 rxorigdstaddr:1;
359 /* 2 bits hole */
360 } bits;
361 __u16 all;
362 } rxopt;
363
364 /* sockopt flags */
365 __u16 recverr:1,
366 sndflow:1,
367 pmtudisc:2,
368 ipv6only:1,
369 srcprefs:3, /* 001: prefer temporary address
370 * 010: prefer public address
371 * 100: prefer care-of address
372 */
373 dontfrag:1;
374 __u8 min_hopcount;
375 __u8 tclass;
376 __u8 rcv_tclass;
377
378 __u32 dst_cookie;
379
380 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
381 struct ipv6_ac_socklist *ipv6_ac_list;
382 struct ipv6_fl_socklist *ipv6_fl_list;
383
384 struct ipv6_txoptions __rcu *opt;
385 struct sk_buff *pktoptions;
386 struct sk_buff *rxpmtu;
387 struct {
388 struct ipv6_txoptions *opt;
389 u8 hop_limit;
390 u8 tclass;
391 } cork;
392 };
393
394 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
395 struct raw6_sock {
396 /* inet_sock has to be the first member of raw6_sock */
397 struct inet_sock inet;
398 __u32 checksum; /* perform checksum */
399 __u32 offset; /* checksum offset */
400 struct icmp6_filter filter;
401 __u32 ip6mr_table;
402 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
403 struct ipv6_pinfo inet6;
404 };
405
406 struct udp6_sock {
407 struct udp_sock udp;
408 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
409 struct ipv6_pinfo inet6;
410 };
411
412 struct tcp6_sock {
413 struct tcp_sock tcp;
414 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
415 struct ipv6_pinfo inet6;
416 };
417
418 extern int inet6_sk_rebuild_header(struct sock *sk);
419
420 #if IS_ENABLED(CONFIG_IPV6)
inet6_sk(const struct sock * __sk)421 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
422 {
423 return inet_sk(__sk)->pinet6;
424 }
425
426 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)427 inet6_rsk(const struct request_sock *rsk)
428 {
429 return (struct inet6_request_sock *)(((u8 *)rsk) +
430 inet_rsk(rsk)->inet6_rsk_offset);
431 }
432
inet6_rsk_offset(struct request_sock * rsk)433 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
434 {
435 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
436 }
437
inet6_reqsk_alloc(struct request_sock_ops * ops)438 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
439 {
440 struct request_sock *req = reqsk_alloc(ops);
441
442 if (req != NULL) {
443 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
444 inet6_rsk(req)->pktopts = NULL;
445 }
446
447 return req;
448 }
449
raw6_sk(const struct sock * sk)450 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
451 {
452 return (struct raw6_sock *)sk;
453 }
454
inet_sk_copy_descendant(struct sock * sk_to,const struct sock * sk_from)455 static inline void inet_sk_copy_descendant(struct sock *sk_to,
456 const struct sock *sk_from)
457 {
458 int ancestor_size = sizeof(struct inet_sock);
459
460 if (sk_from->sk_family == PF_INET6)
461 ancestor_size += sizeof(struct ipv6_pinfo);
462
463 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
464 }
465
466 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
467 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
468
469 struct inet6_timewait_sock {
470 struct in6_addr tw_v6_daddr;
471 struct in6_addr tw_v6_rcv_saddr;
472 };
473
474 struct tcp6_timewait_sock {
475 struct tcp_timewait_sock tcp6tw_tcp;
476 struct inet6_timewait_sock tcp6tw_inet6;
477 };
478
inet6_tw_offset(const struct proto * prot)479 static inline u16 inet6_tw_offset(const struct proto *prot)
480 {
481 return prot->twsk_prot->twsk_obj_size -
482 sizeof(struct inet6_timewait_sock);
483 }
484
inet6_twsk(const struct sock * sk)485 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
486 {
487 return (struct inet6_timewait_sock *)(((u8 *)sk) +
488 inet_twsk(sk)->tw_ipv6_offset);
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 likely(sk->sk_state != TCP_TIME_WAIT) ?
494 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
495 }
496
inet6_rcv_saddr(const struct sock * sk)497 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
498 {
499 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
500 }
501
inet_v6_ipv6only(const struct sock * sk)502 static inline int inet_v6_ipv6only(const struct sock *sk)
503 {
504 return likely(sk->sk_state != TCP_TIME_WAIT) ?
505 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
506 }
507 #else
508 #define __ipv6_only_sock(sk) 0
509 #define ipv6_only_sock(sk) 0
510
inet6_sk(const struct sock * __sk)511 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
512 {
513 return NULL;
514 }
515
516 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)517 inet6_rsk(const struct request_sock *rsk)
518 {
519 return NULL;
520 }
521
raw6_sk(const struct sock * sk)522 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
523 {
524 return NULL;
525 }
526
527 #define __inet6_rcv_saddr(__sk) NULL
528 #define inet6_rcv_saddr(__sk) NULL
529 #define tcp_twsk_ipv6only(__sk) 0
530 #define inet_v6_ipv6only(__sk) 0
531 #endif /* IS_ENABLED(CONFIG_IPV6) */
532
533 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
534 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
535 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
536 ((__sk)->sk_family == AF_INET6) && \
537 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
538 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
539 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
540
541 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
542 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
543 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \
544 ((__sk)->sk_family == PF_INET6) && \
545 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \
546 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
547 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
548
549 #endif /* __KERNEL__ */
550
551 #endif /* _IPV6_H */
552