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TOMOYO Linux Cross Reference
Linux/include/linux/ipv6.h

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  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 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
  8 /*
  9  * This structure contains configuration options per IPv6 link.
 10  */
 11 struct ipv6_devconf {
 12         __s32           forwarding;
 13         __s32           hop_limit;
 14         __s32           mtu6;
 15         __s32           accept_ra;
 16         __s32           accept_redirects;
 17         __s32           autoconf;
 18         __s32           dad_transmits;
 19         __s32           rtr_solicits;
 20         __s32           rtr_solicit_interval;
 21         __s32           rtr_solicit_delay;
 22         __s32           force_mld_version;
 23         __s32           mldv1_unsolicited_report_interval;
 24         __s32           mldv2_unsolicited_report_interval;
 25         __s32           use_tempaddr;
 26         __s32           temp_valid_lft;
 27         __s32           temp_prefered_lft;
 28         __s32           regen_max_retry;
 29         __s32           max_desync_factor;
 30         __s32           max_addresses;
 31         __s32           accept_ra_defrtr;
 32         __s32           accept_ra_pinfo;
 33 #ifdef CONFIG_IPV6_ROUTER_PREF
 34         __s32           accept_ra_rtr_pref;
 35         __s32           rtr_probe_interval;
 36 #ifdef CONFIG_IPV6_ROUTE_INFO
 37         __s32           accept_ra_rt_info_max_plen;
 38 #endif
 39 #endif
 40         __s32           proxy_ndp;
 41         __s32           accept_source_route;
 42         __s32           accept_ra_from_local;
 43 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 44         __s32           optimistic_dad;
 45         __s32           use_optimistic;
 46 #endif
 47 #ifdef CONFIG_IPV6_MROUTE
 48         __s32           mc_forwarding;
 49 #endif
 50         __s32           disable_ipv6;
 51         __s32           accept_dad;
 52         __s32           force_tllao;
 53         __s32           ndisc_notify;
 54         __s32           suppress_frag_ndisc;
 55         __s32           accept_ra_mtu;
 56         void            *sysctl;
 57 };
 58 
 59 struct ipv6_params {
 60         __s32 disable_ipv6;
 61         __s32 autoconf;
 62 };
 63 extern struct ipv6_params ipv6_defaults;
 64 #include <linux/icmpv6.h>
 65 #include <linux/tcp.h>
 66 #include <linux/udp.h>
 67 
 68 #include <net/inet_sock.h>
 69 
 70 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 71 {
 72         return (struct ipv6hdr *)skb_network_header(skb);
 73 }
 74 
 75 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
 76 {
 77         return (struct ipv6hdr *)skb_inner_network_header(skb);
 78 }
 79 
 80 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 81 {
 82         return (struct ipv6hdr *)skb_transport_header(skb);
 83 }
 84 
 85 /* 
 86    This structure contains results of exthdrs parsing
 87    as offsets from skb->nh.
 88  */
 89 
 90 struct inet6_skb_parm {
 91         int                     iif;
 92         __be16                  ra;
 93         __u16                   hop;
 94         __u16                   dst0;
 95         __u16                   srcrt;
 96         __u16                   dst1;
 97         __u16                   lastopt;
 98         __u16                   nhoff;
 99         __u16                   flags;
100 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
101         __u16                   dsthao;
102 #endif
103         __u16                   frag_max_size;
104 
105 #define IP6SKB_XFRM_TRANSFORMED 1
106 #define IP6SKB_FORWARDED        2
107 #define IP6SKB_REROUTED         4
108 #define IP6SKB_ROUTERALERT      8
109 #define IP6SKB_FRAGMENTED      16
110 };
111 
112 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
113 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
114 
115 static inline int inet6_iif(const struct sk_buff *skb)
116 {
117         return IP6CB(skb)->iif;
118 }
119 
120 struct tcp6_request_sock {
121         struct tcp_request_sock   tcp6rsk_tcp;
122 };
123 
124 struct ipv6_mc_socklist;
125 struct ipv6_ac_socklist;
126 struct ipv6_fl_socklist;
127 
128 struct inet6_cork {
129         struct ipv6_txoptions *opt;
130         u8 hop_limit;
131         u8 tclass;
132 };
133 
134 /**
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  */
142 struct ipv6_pinfo {
143         struct in6_addr         saddr;
144         struct in6_pktinfo      sticky_pktinfo;
145         const struct in6_addr           *daddr_cache;
146 #ifdef CONFIG_IPV6_SUBTREES
147         const struct in6_addr           *saddr_cache;
148 #endif
149 
150         __be32                  flow_label;
151         __u32                   frag_size;
152 
153         /*
154          * Packed in 16bits.
155          * Omit one shift by by putting the signed field at MSB.
156          */
157 #if defined(__BIG_ENDIAN_BITFIELD)
158         __s16                   hop_limit:9;
159         __u16                   __unused_1:7;
160 #else
161         __u16                   __unused_1:7;
162         __s16                   hop_limit:9;
163 #endif
164 
165 #if defined(__BIG_ENDIAN_BITFIELD)
166         /* Packed in 16bits. */
167         __s16                   mcast_hops:9;
168         __u16                   __unused_2:6,
169                                 mc_loop:1;
170 #else
171         __u16                   mc_loop:1,
172                                 __unused_2:6;
173         __s16                   mcast_hops:9;
174 #endif
175         int                     ucast_oif;
176         int                     mcast_oif;
177 
178         /* pktoption flags */
179         union {
180                 struct {
181                         __u16   srcrt:1,
182                                 osrcrt:1,
183                                 rxinfo:1,
184                                 rxoinfo:1,
185                                 rxhlim:1,
186                                 rxohlim:1,
187                                 hopopts:1,
188                                 ohopopts:1,
189                                 dstopts:1,
190                                 odstopts:1,
191                                 rxflow:1,
192                                 rxtclass:1,
193                                 rxpmtu:1,
194                                 rxorigdstaddr:1;
195                                 /* 2 bits hole */
196                 } bits;
197                 __u16           all;
198         } rxopt;
199 
200         /* sockopt flags */
201         __u16                   recverr:1,
202                                 sndflow:1,
203                                 repflow:1,
204                                 pmtudisc:3,
205                                 padding:1,      /* 1 bit hole */
206                                 srcprefs:3,     /* 001: prefer temporary address
207                                                  * 010: prefer public address
208                                                  * 100: prefer care-of address
209                                                  */
210                                 dontfrag:1,
211                                 autoflowlabel:1;
212         __u8                    min_hopcount;
213         __u8                    tclass;
214         __be32                  rcv_flowinfo;
215 
216         __u32                   dst_cookie;
217         __u32                   rx_dst_cookie;
218 
219         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
220         struct ipv6_ac_socklist *ipv6_ac_list;
221         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
222 
223         struct ipv6_txoptions   *opt;
224         struct sk_buff          *pktoptions;
225         struct sk_buff          *rxpmtu;
226         struct inet6_cork       cork;
227 };
228 
229 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
230 struct 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;
236         __u32                   ip6mr_table;
237         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
238         struct ipv6_pinfo       inet6;
239 };
240 
241 struct 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 
247 struct 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 
253 extern int inet6_sk_rebuild_header(struct sock *sk);
254 
255 struct tcp6_timewait_sock {
256         struct tcp_timewait_sock   tcp6tw_tcp;
257 };
258 
259 #if IS_ENABLED(CONFIG_IPV6)
260 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
261 {
262         return inet_sk(__sk)->pinet6;
263 }
264 
265 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
266 {
267         return (struct raw6_sock *)sk;
268 }
269 
270 static inline void inet_sk_copy_descendant(struct sock *sk_to,
271                                            const struct sock *sk_from)
272 {
273         int ancestor_size = sizeof(struct inet_sock);
274 
275         if (sk_from->sk_family == PF_INET6)
276                 ancestor_size += sizeof(struct ipv6_pinfo);
277 
278         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
279 }
280 
281 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
282 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
283 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
284                                  inet6_sk(sk)->rxopt.bits.rxinfo)
285 
286 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
287 {
288         if (sk->sk_family == AF_INET6)
289                 return &sk->sk_v6_rcv_saddr;
290         return NULL;
291 }
292 
293 static inline int inet_v6_ipv6only(const struct sock *sk)
294 {
295         /* ipv6only field is at same position for timewait and other sockets */
296         return ipv6_only_sock(sk);
297 }
298 #else
299 #define __ipv6_only_sock(sk)    0
300 #define ipv6_only_sock(sk)      0
301 #define ipv6_sk_rxinfo(sk)      0
302 
303 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
304 {
305         return NULL;
306 }
307 
308 static inline struct inet6_request_sock *
309                         inet6_rsk(const struct request_sock *rsk)
310 {
311         return NULL;
312 }
313 
314 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
315 {
316         return NULL;
317 }
318 
319 #define inet6_rcv_saddr(__sk)   NULL
320 #define tcp_twsk_ipv6only(__sk)         0
321 #define inet_v6_ipv6only(__sk)          0
322 #endif /* IS_ENABLED(CONFIG_IPV6) */
323 #endif /* _IPV6_H */
324 

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