projects/linux·blob v2.6.14 · refs

385 lines · 8.3 KiB

1#ifndef _IPV6_H
2#define _IPV6_H
3
4#include <linux/config.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
19struct in6_pktinfo {
20 struct in6_addr ipi6_addr;
21 int ipi6_ifindex;
22};
23
24
25struct in6_ifreq {
26 struct in6_addr ifr6_addr;
27 __u32 ifr6_prefixlen;
28 int ifr6_ifindex;
29};
30
31#define IPV6_SRCRT_STRICT 0x01 /* this hop must be a neighbor */
32#define IPV6_SRCRT_TYPE_0 0 /* IPv6 type 0 Routing Header */
33
34/*
35 * routing header
36 */
37struct ipv6_rt_hdr {
38 __u8 nexthdr;
39 __u8 hdrlen;
40 __u8 type;
41 __u8 segments_left;
42
43 /*
44 * type specific data
45 * variable length field
46 */
47};
48
49
50struct ipv6_opt_hdr {
51 __u8 nexthdr;
52 __u8 hdrlen;
53 /*
54 * TLV encoded option data follows.
55 */
56};
57
58#define ipv6_destopt_hdr ipv6_opt_hdr
59#define ipv6_hopopt_hdr ipv6_opt_hdr
60
61#ifdef __KERNEL__
62#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
63#endif
64
65/*
66 * routing header type 0 (used in cmsghdr struct)
67 */
68
69struct rt0_hdr {
70 struct ipv6_rt_hdr rt_hdr;
71 __u32 reserved;
72 struct in6_addr addr[0];
73
74#define rt0_type rt_hdr.type
75};
76
77struct ipv6_auth_hdr {
78 __u8 nexthdr;
79 __u8 hdrlen; /* This one is measured in 32 bit units! */
80 __u16 reserved;
81 __u32 spi;
82 __u32 seq_no; /* Sequence number */
83 __u8 auth_data[0]; /* Length variable but >=4. Mind the 64 bit alignment! */
84};
85
86struct ipv6_esp_hdr {
87 __u32 spi;
88 __u32 seq_no; /* Sequence number */
89 __u8 enc_data[0]; /* Length variable but >=8. Mind the 64 bit alignment! */
90};
91
92struct ipv6_comp_hdr {
93 __u8 nexthdr;
94 __u8 flags;
95 __u16 cpi;
96};
97
98/*
99 * IPv6 fixed header
100 *
101 * BEWARE, it is incorrect. The first 4 bits of flow_lbl
102 * are glued to priority now, forming "class".
103 */
104
105struct ipv6hdr {
106#if defined(__LITTLE_ENDIAN_BITFIELD)
107 __u8 priority:4,
108 version:4;
109#elif defined(__BIG_ENDIAN_BITFIELD)
110 __u8 version:4,
111 priority:4;
112#else
113#error "Please fix <asm/byteorder.h>"
114#endif
115 __u8 flow_lbl[3];
116
117 __u16 payload_len;
118 __u8 nexthdr;
119 __u8 hop_limit;
120
121 struct in6_addr saddr;
122 struct in6_addr daddr;
123};
124
125/*
126 * This structure contains configuration options per IPv6 link.
127 */
128struct ipv6_devconf {
129 __s32 forwarding;
130 __s32 hop_limit;
131 __s32 mtu6;
132 __s32 accept_ra;
133 __s32 accept_redirects;
134 __s32 autoconf;
135 __s32 dad_transmits;
136 __s32 rtr_solicits;
137 __s32 rtr_solicit_interval;
138 __s32 rtr_solicit_delay;
139 __s32 force_mld_version;
140#ifdef CONFIG_IPV6_PRIVACY
141 __s32 use_tempaddr;
142 __s32 temp_valid_lft;
143 __s32 temp_prefered_lft;
144 __s32 regen_max_retry;
145 __s32 max_desync_factor;
146#endif
147 __s32 max_addresses;
148 void *sysctl;
149};
150
151/* index values for the variables in ipv6_devconf */
152enum {
153 DEVCONF_FORWARDING = 0,
154 DEVCONF_HOPLIMIT,
155 DEVCONF_MTU6,
156 DEVCONF_ACCEPT_RA,
157 DEVCONF_ACCEPT_REDIRECTS,
158 DEVCONF_AUTOCONF,
159 DEVCONF_DAD_TRANSMITS,
160 DEVCONF_RTR_SOLICITS,
161 DEVCONF_RTR_SOLICIT_INTERVAL,
162 DEVCONF_RTR_SOLICIT_DELAY,
163 DEVCONF_USE_TEMPADDR,
164 DEVCONF_TEMP_VALID_LFT,
165 DEVCONF_TEMP_PREFERED_LFT,
166 DEVCONF_REGEN_MAX_RETRY,
167 DEVCONF_MAX_DESYNC_FACTOR,
168 DEVCONF_MAX_ADDRESSES,
169 DEVCONF_FORCE_MLD_VERSION,
170 DEVCONF_MAX
171};
172
173#ifdef __KERNEL__
174#include <linux/in6.h> /* struct sockaddr_in6 */
175#include <linux/icmpv6.h>
176#include <net/if_inet6.h> /* struct ipv6_mc_socklist */
177#include <linux/tcp.h>
178#include <linux/udp.h>
179
180/*
181 This structure contains results of exthdrs parsing
182 as offsets from skb->nh.
183 */
184
185struct inet6_skb_parm {
186 int iif;
187 __u16 ra;
188 __u16 hop;
189 __u16 dst0;
190 __u16 srcrt;
191 __u16 dst1;
192 __u16 lastopt;
193};
194
195#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
196
197static inline int inet6_iif(const struct sk_buff *skb)
198{
199 return IP6CB(skb)->iif;
200}
201
202struct tcp6_request_sock {
203 struct tcp_request_sock req;
204 struct in6_addr loc_addr;
205 struct in6_addr rmt_addr;
206 struct sk_buff *pktopts;
207 int iif;
208};
209
210static inline struct tcp6_request_sock *tcp6_rsk(const struct request_sock *sk)
211{
212 return (struct tcp6_request_sock *)sk;
213}
214
215/**
216 * struct ipv6_pinfo - ipv6 private area
217 *
218 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
219 * this _must_ be the last member, so that inet6_sk_generic
220 * is able to calculate its offset from the base struct sock
221 * by using the struct proto->slab_obj_size member. -acme
222 */
223struct ipv6_pinfo {
224 struct in6_addr saddr;
225 struct in6_addr rcv_saddr;
226 struct in6_addr daddr;
227 struct in6_addr *daddr_cache;
228
229 __u32 flow_label;
230 __u32 frag_size;
231 __s16 hop_limit;
232 __s16 mcast_hops;
233 int mcast_oif;
234
235 /* pktoption flags */
236 union {
237 struct {
238 __u16 srcrt:2,
239 osrcrt:2,
240 rxinfo:1,
241 rxoinfo:1,
242 rxhlim:1,
243 rxohlim:1,
244 hopopts:1,
245 ohopopts:1,
246 dstopts:1,
247 odstopts:1,
248 rxflow:1,
249 rxtclass:1;
250 } bits;
251 __u16 all;
252 } rxopt;
253
254 /* sockopt flags */
255 __u8 mc_loop:1,
256 recverr:1,
257 sndflow:1,
258 pmtudisc:2,
259 ipv6only:1;
260 __u8 tclass;
261
262 __u32 dst_cookie;
263
264 struct ipv6_mc_socklist *ipv6_mc_list;
265 struct ipv6_ac_socklist *ipv6_ac_list;
266 struct ipv6_fl_socklist *ipv6_fl_list;
267
268 struct ipv6_txoptions *opt;
269 struct sk_buff *pktoptions;
270 struct {
271 struct ipv6_txoptions *opt;
272 struct rt6_info *rt;
273 int hop_limit;
274 int tclass;
275 } cork;
276};
277
278/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
279struct raw6_sock {
280 /* inet_sock has to be the first member of raw6_sock */
281 struct inet_sock inet;
282 __u32 checksum; /* perform checksum */
283 __u32 offset; /* checksum offset */
284 struct icmp6_filter filter;
285 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
286 struct ipv6_pinfo inet6;
287};
288
289struct udp6_sock {
290 struct udp_sock udp;
291 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
292 struct ipv6_pinfo inet6;
293};
294
295struct tcp6_sock {
296 struct tcp_sock tcp;
297 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
298 struct ipv6_pinfo inet6;
299};
300
301#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
302static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
303{
304 return inet_sk(__sk)->pinet6;
305}
306
307static inline struct raw6_sock *raw6_sk(const struct sock *sk)
308{
309 return (struct raw6_sock *)sk;
310}
311
312static inline void inet_sk_copy_descendant(struct sock *sk_to,
313 const struct sock *sk_from)
314{
315 int ancestor_size = sizeof(struct inet_sock);
316
317 if (sk_from->sk_family == PF_INET6)
318 ancestor_size += sizeof(struct ipv6_pinfo);
319
320 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
321}
322
323#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
324#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
325
326#include <linux/tcp.h>
327
328struct tcp6_timewait_sock {
329 struct tcp_timewait_sock tw_v6_sk;
330 struct in6_addr tw_v6_daddr;
331 struct in6_addr tw_v6_rcv_saddr;
332};
333
334static inline struct tcp6_timewait_sock *tcp6_twsk(const struct sock *sk)
335{
336 return (struct tcp6_timewait_sock *)sk;
337}
338
339static inline struct in6_addr *__tcp_v6_rcv_saddr(const struct sock *sk)
340{
341 return likely(sk->sk_state != TCP_TIME_WAIT) ?
342 &inet6_sk(sk)->rcv_saddr : &tcp6_twsk(sk)->tw_v6_rcv_saddr;
343}
344
345static inline struct in6_addr *tcp_v6_rcv_saddr(const struct sock *sk)
346{
347 return sk->sk_family == AF_INET6 ? __tcp_v6_rcv_saddr(sk) : NULL;
348}
349
350static inline int inet_v6_ipv6only(const struct sock *sk)
351{
352 return likely(sk->sk_state != TCP_TIME_WAIT) ?
353 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
354}
355#else
356#define __ipv6_only_sock(sk) 0
357#define ipv6_only_sock(sk) 0
358
359static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
360{
361 return NULL;
362}
363
364static inline struct raw6_sock *raw6_sk(const struct sock *sk)
365{
366 return NULL;
367}
368
369#define __tcp_v6_rcv_saddr(__sk) NULL
370#define tcp_v6_rcv_saddr(__sk) NULL
371#define tcp_twsk_ipv6only(__sk) 0
372#define inet_v6_ipv6only(__sk) 0
373#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
374
375#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
376 (((__sk)->sk_hash == (__hash)) && \
377 ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \
378 ((__sk)->sk_family == AF_INET6) && \
379 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
380 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
381 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
382
383#endif /* __KERNEL__ */
384
385#endif /* _IPV6_H */