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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_max_interval;
 22         __s32           rtr_solicit_delay;
 23         __s32           force_mld_version;
 24         __s32           mldv1_unsolicited_report_interval;
 25         __s32           mldv2_unsolicited_report_interval;
 26         __s32           use_tempaddr;
 27         __s32           temp_valid_lft;
 28         __s32           temp_prefered_lft;
 29         __s32           regen_max_retry;
 30         __s32           max_desync_factor;
 31         __s32           max_addresses;
 32         __s32           accept_ra_defrtr;
 33         __s32           accept_ra_min_hop_limit;
 34         __s32           accept_ra_pinfo;
 35         __s32           ignore_routes_with_linkdown;
 36 #ifdef CONFIG_IPV6_ROUTER_PREF
 37         __s32           accept_ra_rtr_pref;
 38         __s32           rtr_probe_interval;
 39 #ifdef CONFIG_IPV6_ROUTE_INFO
 40         __s32           accept_ra_rt_info_min_plen;
 41         __s32           accept_ra_rt_info_max_plen;
 42 #endif
 43 #endif
 44         __s32           proxy_ndp;
 45         __s32           accept_source_route;
 46         __s32           accept_ra_from_local;
 47 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 48         __s32           optimistic_dad;
 49         __s32           use_optimistic;
 50 #endif
 51 #ifdef CONFIG_IPV6_MROUTE
 52         __s32           mc_forwarding;
 53 #endif
 54         __s32           disable_ipv6;
 55         __s32           drop_unicast_in_l2_multicast;
 56         __s32           accept_dad;
 57         __s32           force_tllao;
 58         __s32           ndisc_notify;
 59         __s32           suppress_frag_ndisc;
 60         __s32           accept_ra_mtu;
 61         __s32           drop_unsolicited_na;
 62         struct ipv6_stable_secret {
 63                 bool initialized;
 64                 struct in6_addr secret;
 65         } stable_secret;
 66         __s32           use_oif_addrs_only;
 67         __s32           keep_addr_on_down;
 68         __s32           seg6_enabled;
 69 #ifdef CONFIG_IPV6_SEG6_HMAC
 70         __s32           seg6_require_hmac;
 71 #endif
 72         __u32           enhanced_dad;
 73         __u32           addr_gen_mode;
 74         __s32           disable_policy;
 75 
 76         struct ctl_table_header *sysctl_header;
 77 };
 78 
 79 struct ipv6_params {
 80         __s32 disable_ipv6;
 81         __s32 autoconf;
 82 };
 83 extern struct ipv6_params ipv6_defaults;
 84 #include <linux/icmpv6.h>
 85 #include <linux/tcp.h>
 86 #include <linux/udp.h>
 87 
 88 #include <net/inet_sock.h>
 89 
 90 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 91 {
 92         return (struct ipv6hdr *)skb_network_header(skb);
 93 }
 94 
 95 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
 96 {
 97         return (struct ipv6hdr *)skb_inner_network_header(skb);
 98 }
 99 
100 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
101 {
102         return (struct ipv6hdr *)skb_transport_header(skb);
103 }
104 
105 /* 
106    This structure contains results of exthdrs parsing
107    as offsets from skb->nh.
108  */
109 
110 struct inet6_skb_parm {
111         int                     iif;
112         __be16                  ra;
113         __u16                   dst0;
114         __u16                   srcrt;
115         __u16                   dst1;
116         __u16                   lastopt;
117         __u16                   nhoff;
118         __u16                   flags;
119 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
120         __u16                   dsthao;
121 #endif
122         __u16                   frag_max_size;
123 
124 #define IP6SKB_XFRM_TRANSFORMED 1
125 #define IP6SKB_FORWARDED        2
126 #define IP6SKB_REROUTED         4
127 #define IP6SKB_ROUTERALERT      8
128 #define IP6SKB_FRAGMENTED      16
129 #define IP6SKB_HOPBYHOP        32
130 #define IP6SKB_L3SLAVE         64
131 #define IP6SKB_JUMBOGRAM      128
132 };
133 
134 #if defined(CONFIG_NET_L3_MASTER_DEV)
135 static inline bool ipv6_l3mdev_skb(__u16 flags)
136 {
137         return flags & IP6SKB_L3SLAVE;
138 }
139 #else
140 static inline bool ipv6_l3mdev_skb(__u16 flags)
141 {
142         return false;
143 }
144 #endif
145 
146 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
147 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
148 
149 static inline int inet6_iif(const struct sk_buff *skb)
150 {
151         bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
152 
153         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
154 }
155 
156 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
157 {
158         return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
159 }
160 
161 /* can not be used in TCP layer after tcp_v6_fill_cb */
162 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
163 {
164 #if defined(CONFIG_NET_L3_MASTER_DEV)
165         if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
166             skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
167                 return true;
168 #endif
169         return false;
170 }
171 
172 struct tcp6_request_sock {
173         struct tcp_request_sock   tcp6rsk_tcp;
174 };
175 
176 struct ipv6_mc_socklist;
177 struct ipv6_ac_socklist;
178 struct ipv6_fl_socklist;
179 
180 struct inet6_cork {
181         struct ipv6_txoptions *opt;
182         u8 hop_limit;
183         u8 tclass;
184 };
185 
186 /**
187  * struct ipv6_pinfo - ipv6 private area
188  *
189  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
190  * this _must_ be the last member, so that inet6_sk_generic
191  * is able to calculate its offset from the base struct sock
192  * by using the struct proto->slab_obj_size member. -acme
193  */
194 struct ipv6_pinfo {
195         struct in6_addr         saddr;
196         struct in6_pktinfo      sticky_pktinfo;
197         const struct in6_addr           *daddr_cache;
198 #ifdef CONFIG_IPV6_SUBTREES
199         const struct in6_addr           *saddr_cache;
200 #endif
201 
202         __be32                  flow_label;
203         __u32                   frag_size;
204 
205         /*
206          * Packed in 16bits.
207          * Omit one shift by by putting the signed field at MSB.
208          */
209 #if defined(__BIG_ENDIAN_BITFIELD)
210         __s16                   hop_limit:9;
211         __u16                   __unused_1:7;
212 #else
213         __u16                   __unused_1:7;
214         __s16                   hop_limit:9;
215 #endif
216 
217 #if defined(__BIG_ENDIAN_BITFIELD)
218         /* Packed in 16bits. */
219         __s16                   mcast_hops:9;
220         __u16                   __unused_2:6,
221                                 mc_loop:1;
222 #else
223         __u16                   mc_loop:1,
224                                 __unused_2:6;
225         __s16                   mcast_hops:9;
226 #endif
227         int                     ucast_oif;
228         int                     mcast_oif;
229 
230         /* pktoption flags */
231         union {
232                 struct {
233                         __u16   srcrt:1,
234                                 osrcrt:1,
235                                 rxinfo:1,
236                                 rxoinfo:1,
237                                 rxhlim:1,
238                                 rxohlim:1,
239                                 hopopts:1,
240                                 ohopopts:1,
241                                 dstopts:1,
242                                 odstopts:1,
243                                 rxflow:1,
244                                 rxtclass:1,
245                                 rxpmtu:1,
246                                 rxorigdstaddr:1,
247                                 recvfragsize:1;
248                                 /* 1 bits hole */
249                 } bits;
250                 __u16           all;
251         } rxopt;
252 
253         /* sockopt flags */
254         __u16                   recverr:1,
255                                 sndflow:1,
256                                 repflow:1,
257                                 pmtudisc:3,
258                                 padding:1,      /* 1 bit hole */
259                                 srcprefs:3,     /* 001: prefer temporary address
260                                                  * 010: prefer public address
261                                                  * 100: prefer care-of address
262                                                  */
263                                 dontfrag:1,
264                                 autoflowlabel:1;
265         __u8                    min_hopcount;
266         __u8                    tclass;
267         __be32                  rcv_flowinfo;
268 
269         __u32                   dst_cookie;
270         __u32                   rx_dst_cookie;
271 
272         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
273         struct ipv6_ac_socklist *ipv6_ac_list;
274         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
275 
276         struct ipv6_txoptions __rcu     *opt;
277         struct sk_buff          *pktoptions;
278         struct sk_buff          *rxpmtu;
279         struct inet6_cork       cork;
280 };
281 
282 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
283 struct raw6_sock {
284         /* inet_sock has to be the first member of raw6_sock */
285         struct inet_sock        inet;
286         __u32                   checksum;       /* perform checksum */
287         __u32                   offset;         /* checksum offset  */
288         struct icmp6_filter     filter;
289         __u32                   ip6mr_table;
290         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
291         struct ipv6_pinfo       inet6;
292 };
293 
294 struct udp6_sock {
295         struct udp_sock   udp;
296         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
297         struct ipv6_pinfo inet6;
298 };
299 
300 struct tcp6_sock {
301         struct tcp_sock   tcp;
302         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
303         struct ipv6_pinfo inet6;
304 };
305 
306 extern int inet6_sk_rebuild_header(struct sock *sk);
307 
308 struct tcp6_timewait_sock {
309         struct tcp_timewait_sock   tcp6tw_tcp;
310 };
311 
312 #if IS_ENABLED(CONFIG_IPV6)
313 bool ipv6_mod_enabled(void);
314 
315 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
316 {
317         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
318 }
319 
320 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
321 {
322         return (struct raw6_sock *)sk;
323 }
324 
325 static inline void inet_sk_copy_descendant(struct sock *sk_to,
326                                            const struct sock *sk_from)
327 {
328         int ancestor_size = sizeof(struct inet_sock);
329 
330         if (sk_from->sk_family == PF_INET6)
331                 ancestor_size += sizeof(struct ipv6_pinfo);
332 
333         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
334 }
335 
336 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
337 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
338 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
339                                  inet6_sk(sk)->rxopt.bits.rxinfo)
340 
341 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
342 {
343         if (sk->sk_family == AF_INET6)
344                 return &sk->sk_v6_rcv_saddr;
345         return NULL;
346 }
347 
348 static inline int inet_v6_ipv6only(const struct sock *sk)
349 {
350         /* ipv6only field is at same position for timewait and other sockets */
351         return ipv6_only_sock(sk);
352 }
353 #else
354 #define __ipv6_only_sock(sk)    0
355 #define ipv6_only_sock(sk)      0
356 #define ipv6_sk_rxinfo(sk)      0
357 
358 static inline bool ipv6_mod_enabled(void)
359 {
360         return false;
361 }
362 
363 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
364 {
365         return NULL;
366 }
367 
368 static inline struct inet6_request_sock *
369                         inet6_rsk(const struct request_sock *rsk)
370 {
371         return NULL;
372 }
373 
374 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
375 {
376         return NULL;
377 }
378 
379 #define inet6_rcv_saddr(__sk)   NULL
380 #define tcp_twsk_ipv6only(__sk)         0
381 #define inet_v6_ipv6only(__sk)          0
382 #endif /* IS_ENABLED(CONFIG_IPV6) */
383 #endif /* _IPV6_H */
384 

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