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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _IPV6_H
2#define _IPV6_H
3
David Howells607ca462012-10-13 10:46:48 +01004#include <uapi/linux/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007/*
8 * This structure contains configuration options per IPv6 link.
9 */
10struct ipv6_devconf {
11 __s32 forwarding;
12 __s32 hop_limit;
13 __s32 mtu6;
14 __s32 accept_ra;
15 __s32 accept_redirects;
16 __s32 autoconf;
17 __s32 dad_transmits;
18 __s32 rtr_solicits;
19 __s32 rtr_solicit_interval;
20 __s32 rtr_solicit_delay;
21 __s32 force_mld_version;
22#ifdef CONFIG_IPV6_PRIVACY
23 __s32 use_tempaddr;
24 __s32 temp_valid_lft;
25 __s32 temp_prefered_lft;
26 __s32 regen_max_retry;
27 __s32 max_desync_factor;
28#endif
29 __s32 max_addresses;
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -080030 __s32 accept_ra_defrtr;
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -080031 __s32 accept_ra_pinfo;
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -080032#ifdef CONFIG_IPV6_ROUTER_PREF
33 __s32 accept_ra_rtr_pref;
YOSHIFUJI Hideaki52e16352006-03-20 17:05:47 -080034 __s32 rtr_probe_interval;
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -080035#ifdef CONFIG_IPV6_ROUTE_INFO
36 __s32 accept_ra_rt_info_max_plen;
37#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -080038#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -070039 __s32 proxy_ndp;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -070040 __s32 accept_source_route;
Neil Horman95c385b2007-04-25 17:08:10 -070041#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
42 __s32 optimistic_dad;
43#endif
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +090044#ifdef CONFIG_IPV6_MROUTE
45 __s32 mc_forwarding;
46#endif
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +090047 __s32 disable_ipv6;
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +090048 __s32 accept_dad;
Octavian Purdilaf7734fd2009-10-02 11:39:15 +000049 __s32 force_tllao;
Hannes Frederic Sowa5cb04432012-11-06 16:46:20 +000050 __s32 ndisc_notify;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 void *sysctl;
52};
Brian Haley56d417b2009-06-01 03:07:33 -070053
54struct ipv6_params {
55 __s32 disable_ipv6;
56 __s32 autoconf;
57};
58extern struct ipv6_params ipv6_defaults;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#include <linux/icmpv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#include <linux/tcp.h>
61#include <linux/udp.h>
62
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020063#include <net/inet_sock.h>
64
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -070065static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
66{
67 return (struct ipv6hdr *)skb_network_header(skb);
68}
69
Joseph Gasparakis6a674e92012-12-07 14:14:14 +000070static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
71{
72 return (struct ipv6hdr *)skb_inner_network_header(skb);
73}
74
Arnaldo Carvalho de Melo39b89162007-04-10 21:06:25 -070075static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
76{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -070077 return (struct ipv6hdr *)skb_transport_header(skb);
Arnaldo Carvalho de Melo39b89162007-04-10 21:06:25 -070078}
79
Jiri Benc7a3198a2012-02-09 09:34:41 +000080static inline __u8 ipv6_tclass(const struct ipv6hdr *iph)
81{
82 return (ntohl(*(__be32 *)iph) >> 20) & 0xff;
83}
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085/*
86 This structure contains results of exthdrs parsing
87 as offsets from skb->nh.
88 */
89
90struct inet6_skb_parm {
91 int iif;
92 __u16 ra;
93 __u16 hop;
94 __u16 dst0;
95 __u16 srcrt;
96 __u16 dst1;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +090097 __u16 lastopt;
David S. Millere7c38152010-07-19 22:01:26 -070098 __u16 nhoff;
Patrick McHardy3e3850e2006-01-06 23:04:54 -080099 __u16 flags;
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700100#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
David S. Miller8dd73682006-08-23 19:25:55 -0700101 __u16 dsthao;
102#endif
Patrick McHardy4cdd34082012-08-26 19:13:58 +0200103 __u16 frag_max_size;
Patrick McHardy3e3850e2006-01-06 23:04:54 -0800104
105#define IP6SKB_XFRM_TRANSFORMED 1
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900106#define IP6SKB_FORWARDED 2
Jan Engelhardt9c6eb282010-04-13 15:32:16 +0200107#define IP6SKB_REROUTED 4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108};
109
110#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
Brian Haley4b340ae2010-04-23 11:26:09 +0000111#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Arnaldo Carvalho de Melo505cbfc2005-08-12 09:19:38 -0300113static inline int inet6_iif(const struct sk_buff *skb)
114{
115 return IP6CB(skb)->iif;
116}
117
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800118struct inet6_request_sock {
Arnaldo Carvalho de Melo2e6599c2005-06-18 22:46:52 -0700119 struct in6_addr loc_addr;
120 struct in6_addr rmt_addr;
121 struct sk_buff *pktopts;
122 int iif;
123};
124
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800125struct tcp6_request_sock {
126 struct tcp_request_sock tcp6rsk_tcp;
127 struct inet6_request_sock tcp6rsk_inet6;
128};
Arnaldo Carvalho de Melo2e6599c2005-06-18 22:46:52 -0700129
Herbert Xu20283d82007-07-30 17:05:49 -0700130struct ipv6_mc_socklist;
131struct ipv6_ac_socklist;
132struct ipv6_fl_socklist;
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134/**
135 * struct ipv6_pinfo - ipv6 private area
136 *
137 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
138 * this _must_ be the last member, so that inet6_sk_generic
139 * is able to calculate its offset from the base struct sock
140 * by using the struct proto->slab_obj_size member. -acme
141 */
142struct ipv6_pinfo {
143 struct in6_addr saddr;
144 struct in6_addr rcv_saddr;
145 struct in6_addr daddr;
Yang Hongyangb24a2512008-12-16 02:06:23 -0800146 struct in6_pktinfo sticky_pktinfo;
Eric Dumazetd3818c92012-07-17 21:38:04 +0000147 const struct in6_addr *daddr_cache;
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700148#ifdef CONFIG_IPV6_SUBTREES
Eric Dumazetd3818c92012-07-17 21:38:04 +0000149 const struct in6_addr *saddr_cache;
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700150#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Al Viro90bcaf72006-11-08 00:25:17 -0800152 __be32 flow_label;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 __u32 frag_size;
YOSHIFUJI Hideaki1d5d2362008-03-10 10:56:55 -0400154
155 /*
156 * Packed in 16bits.
157 * Omit one shift by by putting the signed field at MSB.
158 */
159#if defined(__BIG_ENDIAN_BITFIELD)
160 __s16 hop_limit:9;
161 __u16 __unused_1:7;
162#else
163 __u16 __unused_1:7;
164 __s16 hop_limit:9;
165#endif
166
167#if defined(__BIG_ENDIAN_BITFIELD)
168 /* Packed in 16bits. */
169 __s16 mcast_hops:9;
170 __u16 __unused_2:6,
171 mc_loop:1;
172#else
173 __u16 mc_loop:1,
174 __unused_2:6;
175 __s16 mcast_hops:9;
176#endif
Erich E. Hooverc4062df2012-02-08 09:11:08 +0000177 int ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 int mcast_oif;
179
180 /* pktoption flags */
181 union {
182 struct {
YOSHIFUJI Hideaki4c752092007-05-23 13:28:48 +0900183 __u16 srcrt:1,
184 osrcrt:1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 rxinfo:1,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900186 rxoinfo:1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 rxhlim:1,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900188 rxohlim:1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 hopopts:1,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900190 ohopopts:1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 dstopts:1,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900192 odstopts:1,
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900193 rxflow:1,
Brian Haley793b1472010-04-23 11:26:07 +0000194 rxtclass:1,
Balazs Scheidler6c468622010-10-21 16:08:28 +0200195 rxpmtu:1,
196 rxorigdstaddr:1;
197 /* 2 bits hole */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 } bits;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900199 __u16 all;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 } rxopt;
201
202 /* sockopt flags */
Brian Haley793b1472010-04-23 11:26:07 +0000203 __u16 recverr:1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 sndflow:1,
205 pmtudisc:2,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900206 ipv6only:1,
Brian Haley793b1472010-04-23 11:26:07 +0000207 srcprefs:3, /* 001: prefer temporary address
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900208 * 010: prefer public address
209 * 100: prefer care-of address
210 */
Brian Haley793b1472010-04-23 11:26:07 +0000211 dontfrag:1;
Stephen Hemmingere802af92010-04-22 15:24:53 -0700212 __u8 min_hopcount;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900213 __u8 tclass;
Jiri Benc4c507d22012-02-09 09:35:49 +0000214 __u8 rcv_tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216 __u32 dst_cookie;
Eric Dumazet5d299f32012-08-06 05:09:33 +0000217 __u32 rx_dst_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Eric Dumazet456b61b2010-11-23 13:12:15 +0000219 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 struct ipv6_ac_socklist *ipv6_ac_list;
221 struct ipv6_fl_socklist *ipv6_fl_list;
222
223 struct ipv6_txoptions *opt;
224 struct sk_buff *pktoptions;
Brian Haley4b340ae2010-04-23 11:26:09 +0000225 struct sk_buff *rxpmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 struct {
227 struct ipv6_txoptions *opt;
YOSHIFUJI Hideaki47254742008-03-10 04:41:33 -0400228 u8 hop_limit;
229 u8 tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 } cork;
231};
232
233/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
234struct raw6_sock {
235 /* inet_sock has to be the first member of raw6_sock */
236 struct inet_sock inet;
237 __u32 checksum; /* perform checksum */
238 __u32 offset; /* checksum offset */
239 struct icmp6_filter filter;
Patrick McHardyd1db2752010-05-11 14:40:55 +0200240 __u32 ip6mr_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
242 struct ipv6_pinfo inet6;
243};
244
245struct udp6_sock {
246 struct udp_sock udp;
247 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
248 struct ipv6_pinfo inet6;
249};
250
251struct tcp6_sock {
252 struct tcp_sock tcp;
253 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
254 struct ipv6_pinfo inet6;
255};
256
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800257extern int inet6_sk_rebuild_header(struct sock *sk);
258
David S. Miller48ee3562012-07-11 02:39:24 -0700259struct inet6_timewait_sock {
260 struct in6_addr tw_v6_daddr;
261 struct in6_addr tw_v6_rcv_saddr;
262};
263
264struct tcp6_timewait_sock {
265 struct tcp_timewait_sock tcp6tw_tcp;
266 struct inet6_timewait_sock tcp6tw_inet6;
267};
268
269static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
270{
271 return (struct inet6_timewait_sock *)(((u8 *)sk) +
272 inet_twsk(sk)->tw_ipv6_offset);
273}
274
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000275#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
277{
278 return inet_sk(__sk)->pinet6;
279}
280
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800281static inline struct inet6_request_sock *
282 inet6_rsk(const struct request_sock *rsk)
283{
284 return (struct inet6_request_sock *)(((u8 *)rsk) +
285 inet_rsk(rsk)->inet6_rsk_offset);
286}
287
288static inline u32 inet6_rsk_offset(struct request_sock *rsk)
289{
290 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
291}
292
293static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
294{
295 struct request_sock *req = reqsk_alloc(ops);
296
Arnaldo Carvalho de Meloce4a7d02008-06-10 12:39:35 -0700297 if (req != NULL) {
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800298 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
Arnaldo Carvalho de Meloce4a7d02008-06-10 12:39:35 -0700299 inet6_rsk(req)->pktopts = NULL;
300 }
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800301
302 return req;
303}
304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305static inline struct raw6_sock *raw6_sk(const struct sock *sk)
306{
307 return (struct raw6_sock *)sk;
308}
309
310static inline void inet_sk_copy_descendant(struct sock *sk_to,
311 const struct sock *sk_from)
312{
313 int ancestor_size = sizeof(struct inet_sock);
314
315 if (sk_from->sk_family == PF_INET6)
316 ancestor_size += sizeof(struct ipv6_pinfo);
317
318 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
319}
320
321#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
322#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700323
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800324static inline u16 inet6_tw_offset(const struct proto *prot)
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700325{
Arnaldo Carvalho de Melo6d6ee432005-12-13 23:25:19 -0800326 return prot->twsk_prot->twsk_obj_size -
327 sizeof(struct inet6_timewait_sock);
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700328}
329
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800330static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700331{
332 return likely(sk->sk_state != TCP_TIME_WAIT) ?
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800333 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700334}
335
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800336static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700337{
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800338 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700339}
340
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700341static inline int inet_v6_ipv6only(const struct sock *sk)
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700342{
343 return likely(sk->sk_state != TCP_TIME_WAIT) ?
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700344 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700345}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346#else
347#define __ipv6_only_sock(sk) 0
348#define ipv6_only_sock(sk) 0
349
350static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
351{
352 return NULL;
353}
354
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800355static inline struct inet6_request_sock *
356 inet6_rsk(const struct request_sock *rsk)
357{
358 return NULL;
359}
360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361static inline struct raw6_sock *raw6_sk(const struct sock *sk)
362{
363 return NULL;
364}
365
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800366#define __inet6_rcv_saddr(__sk) NULL
367#define inet6_rcv_saddr(__sk) NULL
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700368#define tcp_twsk_ipv6only(__sk) 0
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700369#define inet_v6_ipv6only(__sk) 0
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000370#endif /* IS_ENABLED(CONFIG_IPV6) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
Eric Dumazetce43b032012-11-30 09:49:27 +0000372#define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \
373 ((inet_sk(__sk)->inet_portpair == (__ports)) && \
374 ((__sk)->sk_family == AF_INET6) && \
375 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
376 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
377 (!(__sk)->sk_bound_dev_if || \
378 ((__sk)->sk_bound_dev_if == (__dif))) && \
379 net_eq(sock_net(__sk), (__net)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Eric Dumazetce43b032012-11-30 09:49:27 +0000381#define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \
382 ((inet_twsk(__sk)->tw_portpair == (__ports)) && \
383 ((__sk)->sk_family == AF_INET6) && \
384 ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)) && \
385 ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \
386 (!(__sk)->sk_bound_dev_if || \
387 ((__sk)->sk_bound_dev_if == (__dif))) && \
388 net_eq(sock_net(__sk), (__net)))
Pavel Emelyanov535174e2008-01-31 05:03:27 -0800389
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700390#endif /* _IPV6_H */