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

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