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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 Hideaki52e163562006-03-20 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070080/*
81 This structure contains results of exthdrs parsing
82 as offsets from skb->nh.
83 */
84
85struct inet6_skb_parm {
86 int iif;
YOSHIFUJI Hideaki / 吉藤英明dd3332b2013-01-13 05:02:45 +000087 __be16 ra;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 __u16 hop;
89 __u16 dst0;
90 __u16 srcrt;
91 __u16 dst1;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +090092 __u16 lastopt;
David S. Millere7c38152010-07-19 22:01:26 -070093 __u16 nhoff;
Patrick McHardy3e3850e2006-01-06 23:04:54 -080094 __u16 flags;
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -070095#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
David S. Miller8dd73682006-08-23 19:25:55 -070096 __u16 dsthao;
97#endif
Patrick McHardy4cdd34082012-08-26 19:13:58 +020098 __u16 frag_max_size;
Patrick McHardy3e3850e2006-01-06 23:04:54 -080099
100#define IP6SKB_XFRM_TRANSFORMED 1
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900101#define IP6SKB_FORWARDED 2
Jan Engelhardt9c6eb282010-04-13 15:32:16 +0200102#define IP6SKB_REROUTED 4
YOSHIFUJI Hideaki / 吉藤英明dd3332b2013-01-13 05:02:45 +0000103#define IP6SKB_ROUTERALERT 8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104};
105
106#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
Brian Haley4b340ae2010-04-23 11:26:09 +0000107#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Arnaldo Carvalho de Melo505cbfc2005-08-12 09:19:38 -0300109static inline int inet6_iif(const struct sk_buff *skb)
110{
111 return IP6CB(skb)->iif;
112}
113
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800114struct inet6_request_sock {
Arnaldo Carvalho de Melo2e6599c2005-06-18 22:46:52 -0700115 struct in6_addr loc_addr;
116 struct in6_addr rmt_addr;
117 struct sk_buff *pktopts;
118 int iif;
119};
120
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800121struct tcp6_request_sock {
122 struct tcp_request_sock tcp6rsk_tcp;
123 struct inet6_request_sock tcp6rsk_inet6;
124};
Arnaldo Carvalho de Melo2e6599c2005-06-18 22:46:52 -0700125
Herbert Xu20283d82007-07-30 17:05:49 -0700126struct ipv6_mc_socklist;
127struct ipv6_ac_socklist;
128struct ipv6_fl_socklist;
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130/**
131 * struct ipv6_pinfo - ipv6 private area
132 *
133 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
134 * this _must_ be the last member, so that inet6_sk_generic
135 * is able to calculate its offset from the base struct sock
136 * by using the struct proto->slab_obj_size member. -acme
137 */
138struct ipv6_pinfo {
139 struct in6_addr saddr;
140 struct in6_addr rcv_saddr;
141 struct in6_addr daddr;
Yang Hongyangb24a2512008-12-16 02:06:23 -0800142 struct in6_pktinfo sticky_pktinfo;
Eric Dumazetd3818c92012-07-17 21:38:04 +0000143 const struct in6_addr *daddr_cache;
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700144#ifdef CONFIG_IPV6_SUBTREES
Eric Dumazetd3818c92012-07-17 21:38:04 +0000145 const struct in6_addr *saddr_cache;
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700146#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Al Viro90bcaf72006-11-08 00:25:17 -0800148 __be32 flow_label;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 __u32 frag_size;
YOSHIFUJI Hideaki1d5d2362008-03-10 10:56:55 -0400150
151 /*
152 * Packed in 16bits.
153 * Omit one shift by by putting the signed field at MSB.
154 */
155#if defined(__BIG_ENDIAN_BITFIELD)
156 __s16 hop_limit:9;
157 __u16 __unused_1:7;
158#else
159 __u16 __unused_1:7;
160 __s16 hop_limit:9;
161#endif
162
163#if defined(__BIG_ENDIAN_BITFIELD)
164 /* Packed in 16bits. */
165 __s16 mcast_hops:9;
166 __u16 __unused_2:6,
167 mc_loop:1;
168#else
169 __u16 mc_loop:1,
170 __unused_2:6;
171 __s16 mcast_hops:9;
172#endif
Erich E. Hooverc4062df2012-02-08 09:11:08 +0000173 int ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 int mcast_oif;
175
176 /* pktoption flags */
177 union {
178 struct {
YOSHIFUJI Hideaki4c752092007-05-23 13:28:48 +0900179 __u16 srcrt:1,
180 osrcrt:1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 rxinfo:1,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900182 rxoinfo:1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 rxhlim:1,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900184 rxohlim:1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 hopopts:1,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900186 ohopopts:1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 dstopts:1,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900188 odstopts:1,
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900189 rxflow:1,
Brian Haley793b14732010-04-23 11:26:07 +0000190 rxtclass:1,
Balazs Scheidler6c468622010-10-21 16:08:28 +0200191 rxpmtu:1,
192 rxorigdstaddr:1;
193 /* 2 bits hole */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 } bits;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900195 __u16 all;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 } rxopt;
197
198 /* sockopt flags */
Brian Haley793b14732010-04-23 11:26:07 +0000199 __u16 recverr:1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 sndflow:1,
201 pmtudisc:2,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900202 ipv6only:1,
Brian Haley793b14732010-04-23 11:26:07 +0000203 srcprefs:3, /* 001: prefer temporary address
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900204 * 010: prefer public address
205 * 100: prefer care-of address
206 */
Brian Haley793b14732010-04-23 11:26:07 +0000207 dontfrag:1;
Stephen Hemmingere802af92010-04-22 15:24:53 -0700208 __u8 min_hopcount;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900209 __u8 tclass;
Jiri Benc4c507d22012-02-09 09:35:49 +0000210 __u8 rcv_tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 __u32 dst_cookie;
Eric Dumazet5d299f32012-08-06 05:09:33 +0000213 __u32 rx_dst_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Eric Dumazet456b61b2010-11-23 13:12:15 +0000215 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 struct ipv6_ac_socklist *ipv6_ac_list;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000217 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
219 struct ipv6_txoptions *opt;
220 struct sk_buff *pktoptions;
Brian Haley4b340ae2010-04-23 11:26:09 +0000221 struct sk_buff *rxpmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 struct {
223 struct ipv6_txoptions *opt;
YOSHIFUJI Hideaki47254742008-03-10 04:41:33 -0400224 u8 hop_limit;
225 u8 tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 } cork;
227};
228
229/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
230struct raw6_sock {
231 /* inet_sock has to be the first member of raw6_sock */
232 struct inet_sock inet;
233 __u32 checksum; /* perform checksum */
234 __u32 offset; /* checksum offset */
235 struct icmp6_filter filter;
Patrick McHardyd1db2752010-05-11 14:40:55 +0200236 __u32 ip6mr_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
238 struct ipv6_pinfo inet6;
239};
240
241struct udp6_sock {
242 struct udp_sock udp;
243 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
244 struct ipv6_pinfo inet6;
245};
246
247struct tcp6_sock {
248 struct tcp_sock tcp;
249 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
250 struct ipv6_pinfo inet6;
251};
252
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800253extern int inet6_sk_rebuild_header(struct sock *sk);
254
David S. Miller48ee3562012-07-11 02:39:24 -0700255struct inet6_timewait_sock {
256 struct in6_addr tw_v6_daddr;
257 struct in6_addr tw_v6_rcv_saddr;
258};
259
260struct tcp6_timewait_sock {
261 struct tcp_timewait_sock tcp6tw_tcp;
262 struct inet6_timewait_sock tcp6tw_inet6;
263};
264
265static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
266{
267 return (struct inet6_timewait_sock *)(((u8 *)sk) +
268 inet_twsk(sk)->tw_ipv6_offset);
269}
270
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000271#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
273{
274 return inet_sk(__sk)->pinet6;
275}
276
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800277static inline struct inet6_request_sock *
278 inet6_rsk(const struct request_sock *rsk)
279{
280 return (struct inet6_request_sock *)(((u8 *)rsk) +
281 inet_rsk(rsk)->inet6_rsk_offset);
282}
283
284static inline u32 inet6_rsk_offset(struct request_sock *rsk)
285{
286 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
287}
288
289static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
290{
291 struct request_sock *req = reqsk_alloc(ops);
292
Arnaldo Carvalho de Meloce4a7d02008-06-10 12:39:35 -0700293 if (req != NULL) {
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800294 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
Arnaldo Carvalho de Meloce4a7d02008-06-10 12:39:35 -0700295 inet6_rsk(req)->pktopts = NULL;
296 }
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800297
298 return req;
299}
300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301static inline struct raw6_sock *raw6_sk(const struct sock *sk)
302{
303 return (struct raw6_sock *)sk;
304}
305
306static inline void inet_sk_copy_descendant(struct sock *sk_to,
307 const struct sock *sk_from)
308{
309 int ancestor_size = sizeof(struct inet_sock);
310
311 if (sk_from->sk_family == PF_INET6)
312 ancestor_size += sizeof(struct ipv6_pinfo);
313
314 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
315}
316
317#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
318#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700319
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800320static inline u16 inet6_tw_offset(const struct proto *prot)
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700321{
Arnaldo Carvalho de Melo6d6ee432005-12-13 23:25:19 -0800322 return prot->twsk_prot->twsk_obj_size -
323 sizeof(struct inet6_timewait_sock);
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700324}
325
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800326static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700327{
328 return likely(sk->sk_state != TCP_TIME_WAIT) ?
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800329 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700330}
331
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800332static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700333{
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800334 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700335}
336
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700337static inline int inet_v6_ipv6only(const struct sock *sk)
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700338{
339 return likely(sk->sk_state != TCP_TIME_WAIT) ?
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700340 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700341}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342#else
343#define __ipv6_only_sock(sk) 0
344#define ipv6_only_sock(sk) 0
345
346static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
347{
348 return NULL;
349}
350
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800351static inline struct inet6_request_sock *
352 inet6_rsk(const struct request_sock *rsk)
353{
354 return NULL;
355}
356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357static inline struct raw6_sock *raw6_sk(const struct sock *sk)
358{
359 return NULL;
360}
361
Arnaldo Carvalho de Melo0fa1a532005-12-13 23:23:09 -0800362#define __inet6_rcv_saddr(__sk) NULL
363#define inet6_rcv_saddr(__sk) NULL
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700364#define tcp_twsk_ipv6only(__sk) 0
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700365#define inet_v6_ipv6only(__sk) 0
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000366#endif /* IS_ENABLED(CONFIG_IPV6) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
Eric Dumazetce43b032012-11-30 09:49:27 +0000368#define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \
369 ((inet_sk(__sk)->inet_portpair == (__ports)) && \
370 ((__sk)->sk_family == AF_INET6) && \
371 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
372 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
373 (!(__sk)->sk_bound_dev_if || \
374 ((__sk)->sk_bound_dev_if == (__dif))) && \
375 net_eq(sock_net(__sk), (__net)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
Eric Dumazetce43b032012-11-30 09:49:27 +0000377#define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \
378 ((inet_twsk(__sk)->tw_portpair == (__ports)) && \
379 ((__sk)->sk_family == AF_INET6) && \
380 ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)) && \
381 ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \
382 (!(__sk)->sk_bound_dev_if || \
383 ((__sk)->sk_bound_dev_if == (__dif))) && \
384 net_eq(sock_net(__sk), (__net)))
Pavel Emelyanov535174e2008-01-31 05:03:27 -0800385
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700386#endif /* _IPV6_H */