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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_min_hop_limit;
 33         __s32           accept_ra_pinfo;
 34         __s32           ignore_routes_with_linkdown;
 35 #ifdef CONFIG_IPV6_ROUTER_PREF
 36         __s32           accept_ra_rtr_pref;
 37         __s32           rtr_probe_interval;
 38 #ifdef CONFIG_IPV6_ROUTE_INFO
 39         __s32           accept_ra_rt_info_max_plen;
 40 #endif
 41 #endif
 42         __s32           proxy_ndp;
 43         __s32           accept_source_route;
 44         __s32           accept_ra_from_local;
 45 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 46         __s32           optimistic_dad;
 47         __s32           use_optimistic;
 48 #endif
 49 #ifdef CONFIG_IPV6_MROUTE
 50         __s32           mc_forwarding;
 51 #endif
 52         __s32           disable_ipv6;
 53         __s32           drop_unicast_in_l2_multicast;
 54         __s32           accept_dad;
 55         __s32           force_tllao;
 56         __s32           ndisc_notify;
 57         __s32           suppress_frag_ndisc;
 58         __s32           accept_ra_mtu;
 59         __s32           drop_unsolicited_na;
 60         struct ipv6_stable_secret {
 61                 bool initialized;
 62                 struct in6_addr secret;
 63         } stable_secret;
 64         __s32           use_oif_addrs_only;
 65         __s32           keep_addr_on_down;
 66 
 67         struct ctl_table_header *sysctl_header;
 68 };
 69 
 70 struct ipv6_params {
 71         __s32 disable_ipv6;
 72         __s32 autoconf;
 73 };
 74 extern struct ipv6_params ipv6_defaults;
 75 #include <linux/icmpv6.h>
 76 #include <linux/tcp.h>
 77 #include <linux/udp.h>
 78 
 79 #include <net/inet_sock.h>
 80 
 81 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 82 {
 83         return (struct ipv6hdr *)skb_network_header(skb);
 84 }
 85 
 86 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
 87 {
 88         return (struct ipv6hdr *)skb_inner_network_header(skb);
 89 }
 90 
 91 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 92 {
 93         return (struct ipv6hdr *)skb_transport_header(skb);
 94 }
 95 
 96 /* 
 97    This structure contains results of exthdrs parsing
 98    as offsets from skb->nh.
 99  */
100 
101 struct inet6_skb_parm {
102         int                     iif;
103         __be16                  ra;
104         __u16                   dst0;
105         __u16                   srcrt;
106         __u16                   dst1;
107         __u16                   lastopt;
108         __u16                   nhoff;
109         __u16                   flags;
110 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
111         __u16                   dsthao;
112 #endif
113         __u16                   frag_max_size;
114 
115 #define IP6SKB_XFRM_TRANSFORMED 1
116 #define IP6SKB_FORWARDED        2
117 #define IP6SKB_REROUTED         4
118 #define IP6SKB_ROUTERALERT      8
119 #define IP6SKB_FRAGMENTED      16
120 #define IP6SKB_HOPBYHOP        32
121 #define IP6SKB_L3SLAVE         64
122 };
123 
124 #if defined(CONFIG_NET_L3_MASTER_DEV)
125 static inline bool skb_l3mdev_slave(__u16 flags)
126 {
127         return flags & IP6SKB_L3SLAVE;
128 }
129 #else
130 static inline bool skb_l3mdev_slave(__u16 flags)
131 {
132         return false;
133 }
134 #endif
135 
136 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
137 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
138 
139 static inline int inet6_iif(const struct sk_buff *skb)
140 {
141         bool l3_slave = skb_l3mdev_slave(IP6CB(skb)->flags);
142 
143         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
144 }
145 
146 struct tcp6_request_sock {
147         struct tcp_request_sock   tcp6rsk_tcp;
148 };
149 
150 struct ipv6_mc_socklist;
151 struct ipv6_ac_socklist;
152 struct ipv6_fl_socklist;
153 
154 struct inet6_cork {
155         struct ipv6_txoptions *opt;
156         u8 hop_limit;
157         u8 tclass;
158 };
159 
160 /**
161  * struct ipv6_pinfo - ipv6 private area
162  *
163  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
164  * this _must_ be the last member, so that inet6_sk_generic
165  * is able to calculate its offset from the base struct sock
166  * by using the struct proto->slab_obj_size member. -acme
167  */
168 struct ipv6_pinfo {
169         struct in6_addr         saddr;
170         struct in6_pktinfo      sticky_pktinfo;
171         const struct in6_addr           *daddr_cache;
172 #ifdef CONFIG_IPV6_SUBTREES
173         const struct in6_addr           *saddr_cache;
174 #endif
175 
176         __be32                  flow_label;
177         __u32                   frag_size;
178 
179         /*
180          * Packed in 16bits.
181          * Omit one shift by by putting the signed field at MSB.
182          */
183 #if defined(__BIG_ENDIAN_BITFIELD)
184         __s16                   hop_limit:9;
185         __u16                   __unused_1:7;
186 #else
187         __u16                   __unused_1:7;
188         __s16                   hop_limit:9;
189 #endif
190 
191 #if defined(__BIG_ENDIAN_BITFIELD)
192         /* Packed in 16bits. */
193         __s16                   mcast_hops:9;
194         __u16                   __unused_2:6,
195                                 mc_loop:1;
196 #else
197         __u16                   mc_loop:1,
198                                 __unused_2:6;
199         __s16                   mcast_hops:9;
200 #endif
201         int                     ucast_oif;
202         int                     mcast_oif;
203 
204         /* pktoption flags */
205         union {
206                 struct {
207                         __u16   srcrt:1,
208                                 osrcrt:1,
209                                 rxinfo:1,
210                                 rxoinfo:1,
211                                 rxhlim:1,
212                                 rxohlim:1,
213                                 hopopts:1,
214                                 ohopopts:1,
215                                 dstopts:1,
216                                 odstopts:1,
217                                 rxflow:1,
218                                 rxtclass:1,
219                                 rxpmtu:1,
220                                 rxorigdstaddr:1;
221                                 /* 2 bits hole */
222                 } bits;
223                 __u16           all;
224         } rxopt;
225 
226         /* sockopt flags */
227         __u16                   recverr:1,
228                                 sndflow:1,
229                                 repflow:1,
230                                 pmtudisc:3,
231                                 padding:1,      /* 1 bit hole */
232                                 srcprefs:3,     /* 001: prefer temporary address
233                                                  * 010: prefer public address
234                                                  * 100: prefer care-of address
235                                                  */
236                                 dontfrag:1,
237                                 autoflowlabel:1;
238         __u8                    min_hopcount;
239         __u8                    tclass;
240         __be32                  rcv_flowinfo;
241 
242         __u32                   dst_cookie;
243         __u32                   rx_dst_cookie;
244 
245         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
246         struct ipv6_ac_socklist *ipv6_ac_list;
247         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
248 
249         struct ipv6_txoptions __rcu     *opt;
250         struct sk_buff          *pktoptions;
251         struct sk_buff          *rxpmtu;
252         struct inet6_cork       cork;
253 };
254 
255 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
256 struct raw6_sock {
257         /* inet_sock has to be the first member of raw6_sock */
258         struct inet_sock        inet;
259         __u32                   checksum;       /* perform checksum */
260         __u32                   offset;         /* checksum offset  */
261         struct icmp6_filter     filter;
262         __u32                   ip6mr_table;
263         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
264         struct ipv6_pinfo       inet6;
265 };
266 
267 struct udp6_sock {
268         struct udp_sock   udp;
269         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
270         struct ipv6_pinfo inet6;
271 };
272 
273 struct tcp6_sock {
274         struct tcp_sock   tcp;
275         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
276         struct ipv6_pinfo inet6;
277 };
278 
279 extern int inet6_sk_rebuild_header(struct sock *sk);
280 
281 struct tcp6_timewait_sock {
282         struct tcp_timewait_sock   tcp6tw_tcp;
283 };
284 
285 #if IS_ENABLED(CONFIG_IPV6)
286 bool ipv6_mod_enabled(void);
287 
288 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
289 {
290         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
291 }
292 
293 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
294 {
295         return (struct raw6_sock *)sk;
296 }
297 
298 static inline void inet_sk_copy_descendant(struct sock *sk_to,
299                                            const struct sock *sk_from)
300 {
301         int ancestor_size = sizeof(struct inet_sock);
302 
303         if (sk_from->sk_family == PF_INET6)
304                 ancestor_size += sizeof(struct ipv6_pinfo);
305 
306         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
307 }
308 
309 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
310 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
311 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
312                                  inet6_sk(sk)->rxopt.bits.rxinfo)
313 
314 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
315 {
316         if (sk->sk_family == AF_INET6)
317                 return &sk->sk_v6_rcv_saddr;
318         return NULL;
319 }
320 
321 static inline int inet_v6_ipv6only(const struct sock *sk)
322 {
323         /* ipv6only field is at same position for timewait and other sockets */
324         return ipv6_only_sock(sk);
325 }
326 #else
327 #define __ipv6_only_sock(sk)    0
328 #define ipv6_only_sock(sk)      0
329 #define ipv6_sk_rxinfo(sk)      0
330 
331 static inline bool ipv6_mod_enabled(void)
332 {
333         return false;
334 }
335 
336 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
337 {
338         return NULL;
339 }
340 
341 static inline struct inet6_request_sock *
342                         inet6_rsk(const struct request_sock *rsk)
343 {
344         return NULL;
345 }
346 
347 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
348 {
349         return NULL;
350 }
351 
352 #define inet6_rcv_saddr(__sk)   NULL
353 #define tcp_twsk_ipv6only(__sk)         0
354 #define inet_v6_ipv6only(__sk)          0
355 #endif /* IS_ENABLED(CONFIG_IPV6) */
356 #endif /* _IPV6_H */
357 

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