Linux kernel mirror (for testing)
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linux
1#ifndef _IPV6_H
2#define _IPV6_H
3
4#include <uapi/linux/ipv6.h>
5
6#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
7/*
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;
30 __s32 accept_ra_defrtr;
31 __s32 accept_ra_pinfo;
32#ifdef CONFIG_IPV6_ROUTER_PREF
33 __s32 accept_ra_rtr_pref;
34 __s32 rtr_probe_interval;
35#ifdef CONFIG_IPV6_ROUTE_INFO
36 __s32 accept_ra_rt_info_max_plen;
37#endif
38#endif
39 __s32 proxy_ndp;
40 __s32 accept_source_route;
41#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
42 __s32 optimistic_dad;
43#endif
44#ifdef CONFIG_IPV6_MROUTE
45 __s32 mc_forwarding;
46#endif
47 __s32 disable_ipv6;
48 __s32 accept_dad;
49 __s32 force_tllao;
50 void *sysctl;
51};
52
53struct ipv6_params {
54 __s32 disable_ipv6;
55 __s32 autoconf;
56};
57extern struct ipv6_params ipv6_defaults;
58#include <linux/icmpv6.h>
59#include <linux/tcp.h>
60#include <linux/udp.h>
61
62#include <net/inet_sock.h>
63
64static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
65{
66 return (struct ipv6hdr *)skb_network_header(skb);
67}
68
69static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
70{
71 return (struct ipv6hdr *)skb_transport_header(skb);
72}
73
74static inline __u8 ipv6_tclass(const struct ipv6hdr *iph)
75{
76 return (ntohl(*(__be32 *)iph) >> 20) & 0xff;
77}
78
79/*
80 This structure contains results of exthdrs parsing
81 as offsets from skb->nh.
82 */
83
84struct inet6_skb_parm {
85 int iif;
86 __u16 ra;
87 __u16 hop;
88 __u16 dst0;
89 __u16 srcrt;
90 __u16 dst1;
91 __u16 lastopt;
92 __u16 nhoff;
93 __u16 flags;
94#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
95 __u16 dsthao;
96#endif
97 __u16 frag_max_size;
98
99#define IP6SKB_XFRM_TRANSFORMED 1
100#define IP6SKB_FORWARDED 2
101#define IP6SKB_REROUTED 4
102};
103
104#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
105#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
106
107static inline int inet6_iif(const struct sk_buff *skb)
108{
109 return IP6CB(skb)->iif;
110}
111
112struct inet6_request_sock {
113 struct in6_addr loc_addr;
114 struct in6_addr rmt_addr;
115 struct sk_buff *pktopts;
116 int iif;
117};
118
119struct tcp6_request_sock {
120 struct tcp_request_sock tcp6rsk_tcp;
121 struct inet6_request_sock tcp6rsk_inet6;
122};
123
124struct ipv6_mc_socklist;
125struct ipv6_ac_socklist;
126struct ipv6_fl_socklist;
127
128/**
129 * struct ipv6_pinfo - ipv6 private area
130 *
131 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
132 * this _must_ be the last member, so that inet6_sk_generic
133 * is able to calculate its offset from the base struct sock
134 * by using the struct proto->slab_obj_size member. -acme
135 */
136struct ipv6_pinfo {
137 struct in6_addr saddr;
138 struct in6_addr rcv_saddr;
139 struct in6_addr daddr;
140 struct in6_pktinfo sticky_pktinfo;
141 const struct in6_addr *daddr_cache;
142#ifdef CONFIG_IPV6_SUBTREES
143 const struct in6_addr *saddr_cache;
144#endif
145
146 __be32 flow_label;
147 __u32 frag_size;
148
149 /*
150 * Packed in 16bits.
151 * Omit one shift by by putting the signed field at MSB.
152 */
153#if defined(__BIG_ENDIAN_BITFIELD)
154 __s16 hop_limit:9;
155 __u16 __unused_1:7;
156#else
157 __u16 __unused_1:7;
158 __s16 hop_limit:9;
159#endif
160
161#if defined(__BIG_ENDIAN_BITFIELD)
162 /* Packed in 16bits. */
163 __s16 mcast_hops:9;
164 __u16 __unused_2:6,
165 mc_loop:1;
166#else
167 __u16 mc_loop:1,
168 __unused_2:6;
169 __s16 mcast_hops:9;
170#endif
171 int ucast_oif;
172 int mcast_oif;
173
174 /* pktoption flags */
175 union {
176 struct {
177 __u16 srcrt:1,
178 osrcrt:1,
179 rxinfo:1,
180 rxoinfo:1,
181 rxhlim:1,
182 rxohlim:1,
183 hopopts:1,
184 ohopopts:1,
185 dstopts:1,
186 odstopts:1,
187 rxflow:1,
188 rxtclass:1,
189 rxpmtu:1,
190 rxorigdstaddr:1;
191 /* 2 bits hole */
192 } bits;
193 __u16 all;
194 } rxopt;
195
196 /* sockopt flags */
197 __u16 recverr:1,
198 sndflow:1,
199 pmtudisc:2,
200 ipv6only:1,
201 srcprefs:3, /* 001: prefer temporary address
202 * 010: prefer public address
203 * 100: prefer care-of address
204 */
205 dontfrag:1;
206 __u8 min_hopcount;
207 __u8 tclass;
208 __u8 rcv_tclass;
209
210 __u32 dst_cookie;
211 __u32 rx_dst_cookie;
212
213 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
214 struct ipv6_ac_socklist *ipv6_ac_list;
215 struct ipv6_fl_socklist *ipv6_fl_list;
216
217 struct ipv6_txoptions *opt;
218 struct sk_buff *pktoptions;
219 struct sk_buff *rxpmtu;
220 struct {
221 struct ipv6_txoptions *opt;
222 u8 hop_limit;
223 u8 tclass;
224 } cork;
225};
226
227/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
228struct raw6_sock {
229 /* inet_sock has to be the first member of raw6_sock */
230 struct inet_sock inet;
231 __u32 checksum; /* perform checksum */
232 __u32 offset; /* checksum offset */
233 struct icmp6_filter filter;
234 __u32 ip6mr_table;
235 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
236 struct ipv6_pinfo inet6;
237};
238
239struct udp6_sock {
240 struct udp_sock udp;
241 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
242 struct ipv6_pinfo inet6;
243};
244
245struct tcp6_sock {
246 struct tcp_sock tcp;
247 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
248 struct ipv6_pinfo inet6;
249};
250
251extern int inet6_sk_rebuild_header(struct sock *sk);
252
253struct inet6_timewait_sock {
254 struct in6_addr tw_v6_daddr;
255 struct in6_addr tw_v6_rcv_saddr;
256};
257
258struct tcp6_timewait_sock {
259 struct tcp_timewait_sock tcp6tw_tcp;
260 struct inet6_timewait_sock tcp6tw_inet6;
261};
262
263static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
264{
265 return (struct inet6_timewait_sock *)(((u8 *)sk) +
266 inet_twsk(sk)->tw_ipv6_offset);
267}
268
269#if IS_ENABLED(CONFIG_IPV6)
270static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
271{
272 return inet_sk(__sk)->pinet6;
273}
274
275static inline struct inet6_request_sock *
276 inet6_rsk(const struct request_sock *rsk)
277{
278 return (struct inet6_request_sock *)(((u8 *)rsk) +
279 inet_rsk(rsk)->inet6_rsk_offset);
280}
281
282static inline u32 inet6_rsk_offset(struct request_sock *rsk)
283{
284 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
285}
286
287static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
288{
289 struct request_sock *req = reqsk_alloc(ops);
290
291 if (req != NULL) {
292 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
293 inet6_rsk(req)->pktopts = NULL;
294 }
295
296 return req;
297}
298
299static inline struct raw6_sock *raw6_sk(const struct sock *sk)
300{
301 return (struct raw6_sock *)sk;
302}
303
304static inline void inet_sk_copy_descendant(struct sock *sk_to,
305 const struct sock *sk_from)
306{
307 int ancestor_size = sizeof(struct inet_sock);
308
309 if (sk_from->sk_family == PF_INET6)
310 ancestor_size += sizeof(struct ipv6_pinfo);
311
312 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
313}
314
315#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
316#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
317
318static inline u16 inet6_tw_offset(const struct proto *prot)
319{
320 return prot->twsk_prot->twsk_obj_size -
321 sizeof(struct inet6_timewait_sock);
322}
323
324static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
325{
326 return likely(sk->sk_state != TCP_TIME_WAIT) ?
327 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
328}
329
330static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
331{
332 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
333}
334
335static inline int inet_v6_ipv6only(const struct sock *sk)
336{
337 return likely(sk->sk_state != TCP_TIME_WAIT) ?
338 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
339}
340#else
341#define __ipv6_only_sock(sk) 0
342#define ipv6_only_sock(sk) 0
343
344static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
345{
346 return NULL;
347}
348
349static inline struct inet6_request_sock *
350 inet6_rsk(const struct request_sock *rsk)
351{
352 return NULL;
353}
354
355static inline struct raw6_sock *raw6_sk(const struct sock *sk)
356{
357 return NULL;
358}
359
360#define __inet6_rcv_saddr(__sk) NULL
361#define inet6_rcv_saddr(__sk) NULL
362#define tcp_twsk_ipv6only(__sk) 0
363#define inet_v6_ipv6only(__sk) 0
364#endif /* IS_ENABLED(CONFIG_IPV6) */
365
366#define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
367 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
368 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
369 ((__sk)->sk_family == AF_INET6) && \
370 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
371 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
372 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
373
374#define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
375 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
376 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \
377 ((__sk)->sk_family == PF_INET6) && \
378 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \
379 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
380 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
381
382#endif /* _IPV6_H */