Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ipv6.h
Go to the documentation of this file.
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  */
10 struct 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 
53 struct ipv6_params {
54  __s32 disable_ipv6;
55  __s32 autoconf;
56 };
57 extern 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 
64 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
65 {
66  return (struct ipv6hdr *)skb_network_header(skb);
67 }
68 
69 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
70 {
71  return (struct ipv6hdr *)skb_transport_header(skb);
72 }
73 
74 static 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 
84 struct 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 
107 static inline int inet6_iif(const struct sk_buff *skb)
108 {
109  return IP6CB(skb)->iif;
110 }
111 
112 struct 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 
119 struct tcp6_request_sock {
120  struct tcp_request_sock tcp6rsk_tcp;
121  struct inet6_request_sock tcp6rsk_inet6;
122 };
123 
124 struct ipv6_mc_socklist;
125 struct ipv6_ac_socklist;
126 struct ipv6_fl_socklist;
127 
136 struct 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! */
228 struct 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 
239 struct 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 
245 struct 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 
251 extern int inet6_sk_rebuild_header(struct sock *sk);
252 
253 struct inet6_timewait_sock {
254  struct in6_addr tw_v6_daddr;
255  struct in6_addr tw_v6_rcv_saddr;
256 };
257 
258 struct tcp6_timewait_sock {
259  struct tcp_timewait_sock tcp6tw_tcp;
260  struct inet6_timewait_sock tcp6tw_inet6;
261 };
262 
263 static 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)
270 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
271 {
272  return inet_sk(__sk)->pinet6;
273 }
274 
275 static 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 
282 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
283 {
284  return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
285 }
286 
287 static 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 
299 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
300 {
301  return (struct raw6_sock *)sk;
302 }
303 
304 static 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 
318 static 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 
324 static 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 
330 static 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 
335 static 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 
344 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
345 {
346  return NULL;
347 }
348 
349 static inline struct inet6_request_sock *
350  inet6_rsk(const struct request_sock *rsk)
351 {
352  return NULL;
353 }
354 
355 static 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 */
Generated on Thu Jan 10 2013 14:51:40 for Linux Kernel by   doxygen 1.8.2