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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _IPV6_H
  3 #define _IPV6_H
  4 
  5 #include <uapi/linux/ipv6.h>
  6 
  7 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
  8 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
  9 /*
 10  * This structure contains configuration options per IPv6 link.
 11  */
 12 struct ipv6_devconf {
 13         __s32           forwarding;
 14         __s32           hop_limit;
 15         __s32           mtu6;
 16         __s32           accept_ra;
 17         __s32           accept_redirects;
 18         __s32           autoconf;
 19         __s32           dad_transmits;
 20         __s32           rtr_solicits;
 21         __s32           rtr_solicit_interval;
 22         __s32           rtr_solicit_max_interval;
 23         __s32           rtr_solicit_delay;
 24         __s32           force_mld_version;
 25         __s32           mldv1_unsolicited_report_interval;
 26         __s32           mldv2_unsolicited_report_interval;
 27         __s32           use_tempaddr;
 28         __s32           temp_valid_lft;
 29         __s32           temp_prefered_lft;
 30         __s32           regen_max_retry;
 31         __s32           max_desync_factor;
 32         __s32           max_addresses;
 33         __s32           accept_ra_defrtr;
 34         __s32           accept_ra_min_hop_limit;
 35         __s32           accept_ra_pinfo;
 36         __s32           ignore_routes_with_linkdown;
 37 #ifdef CONFIG_IPV6_ROUTER_PREF
 38         __s32           accept_ra_rtr_pref;
 39         __s32           rtr_probe_interval;
 40 #ifdef CONFIG_IPV6_ROUTE_INFO
 41         __s32           accept_ra_rt_info_min_plen;
 42         __s32           accept_ra_rt_info_max_plen;
 43 #endif
 44 #endif
 45         __s32           proxy_ndp;
 46         __s32           accept_source_route;
 47         __s32           accept_ra_from_local;
 48 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 49         __s32           optimistic_dad;
 50         __s32           use_optimistic;
 51 #endif
 52 #ifdef CONFIG_IPV6_MROUTE
 53         __s32           mc_forwarding;
 54 #endif
 55         __s32           disable_ipv6;
 56         __s32           drop_unicast_in_l2_multicast;
 57         __s32           accept_dad;
 58         __s32           force_tllao;
 59         __s32           ndisc_notify;
 60         __s32           suppress_frag_ndisc;
 61         __s32           accept_ra_mtu;
 62         __s32           drop_unsolicited_na;
 63         struct ipv6_stable_secret {
 64                 bool initialized;
 65                 struct in6_addr secret;
 66         } stable_secret;
 67         __s32           use_oif_addrs_only;
 68         __s32           keep_addr_on_down;
 69         __s32           seg6_enabled;
 70 #ifdef CONFIG_IPV6_SEG6_HMAC
 71         __s32           seg6_require_hmac;
 72 #endif
 73         __u32           enhanced_dad;
 74         __u32           addr_gen_mode;
 75         __s32           disable_policy;
 76         __s32           ndisc_tclass;
 77 
 78         struct ctl_table_header *sysctl_header;
 79 };
 80 
 81 struct ipv6_params {
 82         __s32 disable_ipv6;
 83         __s32 autoconf;
 84 };
 85 extern struct ipv6_params ipv6_defaults;
 86 #include <linux/icmpv6.h>
 87 #include <linux/tcp.h>
 88 #include <linux/udp.h>
 89 
 90 #include <net/inet_sock.h>
 91 
 92 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 93 {
 94         return (struct ipv6hdr *)skb_network_header(skb);
 95 }
 96 
 97 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
 98 {
 99         return (struct ipv6hdr *)skb_inner_network_header(skb);
100 }
101 
102 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
103 {
104         return (struct ipv6hdr *)skb_transport_header(skb);
105 }
106 
107 /* 
108    This structure contains results of exthdrs parsing
109    as offsets from skb->nh.
110  */
111 
112 struct inet6_skb_parm {
113         int                     iif;
114         __be16                  ra;
115         __u16                   dst0;
116         __u16                   srcrt;
117         __u16                   dst1;
118         __u16                   lastopt;
119         __u16                   nhoff;
120         __u16                   flags;
121 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
122         __u16                   dsthao;
123 #endif
124         __u16                   frag_max_size;
125 
126 #define IP6SKB_XFRM_TRANSFORMED 1
127 #define IP6SKB_FORWARDED        2
128 #define IP6SKB_REROUTED         4
129 #define IP6SKB_ROUTERALERT      8
130 #define IP6SKB_FRAGMENTED      16
131 #define IP6SKB_HOPBYHOP        32
132 #define IP6SKB_L3SLAVE         64
133 #define IP6SKB_JUMBOGRAM      128
134 };
135 
136 #if defined(CONFIG_NET_L3_MASTER_DEV)
137 static inline bool ipv6_l3mdev_skb(__u16 flags)
138 {
139         return flags & IP6SKB_L3SLAVE;
140 }
141 #else
142 static inline bool ipv6_l3mdev_skb(__u16 flags)
143 {
144         return false;
145 }
146 #endif
147 
148 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
149 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
150 
151 static inline int inet6_iif(const struct sk_buff *skb)
152 {
153         bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
154 
155         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
156 }
157 
158 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
159 {
160         return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
161 }
162 
163 /* can not be used in TCP layer after tcp_v6_fill_cb */
164 static inline int inet6_sdif(const struct sk_buff *skb)
165 {
166 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
167         if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
168                 return IP6CB(skb)->iif;
169 #endif
170         return 0;
171 }
172 
173 /* can not be used in TCP layer after tcp_v6_fill_cb */
174 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
175 {
176 #if defined(CONFIG_NET_L3_MASTER_DEV)
177         if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
178             skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
179                 return true;
180 #endif
181         return false;
182 }
183 
184 struct tcp6_request_sock {
185         struct tcp_request_sock   tcp6rsk_tcp;
186 };
187 
188 struct ipv6_mc_socklist;
189 struct ipv6_ac_socklist;
190 struct ipv6_fl_socklist;
191 
192 struct inet6_cork {
193         struct ipv6_txoptions *opt;
194         u8 hop_limit;
195         u8 tclass;
196 };
197 
198 /**
199  * struct ipv6_pinfo - ipv6 private area
200  *
201  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
202  * this _must_ be the last member, so that inet6_sk_generic
203  * is able to calculate its offset from the base struct sock
204  * by using the struct proto->slab_obj_size member. -acme
205  */
206 struct ipv6_pinfo {
207         struct in6_addr         saddr;
208         struct in6_pktinfo      sticky_pktinfo;
209         const struct in6_addr           *daddr_cache;
210 #ifdef CONFIG_IPV6_SUBTREES
211         const struct in6_addr           *saddr_cache;
212 #endif
213 
214         __be32                  flow_label;
215         __u32                   frag_size;
216 
217         /*
218          * Packed in 16bits.
219          * Omit one shift by by putting the signed field at MSB.
220          */
221 #if defined(__BIG_ENDIAN_BITFIELD)
222         __s16                   hop_limit:9;
223         __u16                   __unused_1:7;
224 #else
225         __u16                   __unused_1:7;
226         __s16                   hop_limit:9;
227 #endif
228 
229 #if defined(__BIG_ENDIAN_BITFIELD)
230         /* Packed in 16bits. */
231         __s16                   mcast_hops:9;
232         __u16                   __unused_2:6,
233                                 mc_loop:1;
234 #else
235         __u16                   mc_loop:1,
236                                 __unused_2:6;
237         __s16                   mcast_hops:9;
238 #endif
239         int                     ucast_oif;
240         int                     mcast_oif;
241 
242         /* pktoption flags */
243         union {
244                 struct {
245                         __u16   srcrt:1,
246                                 osrcrt:1,
247                                 rxinfo:1,
248                                 rxoinfo:1,
249                                 rxhlim:1,
250                                 rxohlim:1,
251                                 hopopts:1,
252                                 ohopopts:1,
253                                 dstopts:1,
254                                 odstopts:1,
255                                 rxflow:1,
256                                 rxtclass:1,
257                                 rxpmtu:1,
258                                 rxorigdstaddr:1,
259                                 recvfragsize:1;
260                                 /* 1 bits hole */
261                 } bits;
262                 __u16           all;
263         } rxopt;
264 
265         /* sockopt flags */
266         __u16                   recverr:1,
267                                 sndflow:1,
268                                 repflow:1,
269                                 pmtudisc:3,
270                                 padding:1,      /* 1 bit hole */
271                                 srcprefs:3,     /* 001: prefer temporary address
272                                                  * 010: prefer public address
273                                                  * 100: prefer care-of address
274                                                  */
275                                 dontfrag:1,
276                                 autoflowlabel:1,
277                                 autoflowlabel_set:1;
278         __u8                    min_hopcount;
279         __u8                    tclass;
280         __be32                  rcv_flowinfo;
281 
282         __u32                   dst_cookie;
283         __u32                   rx_dst_cookie;
284 
285         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
286         struct ipv6_ac_socklist *ipv6_ac_list;
287         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
288 
289         struct ipv6_txoptions __rcu     *opt;
290         struct sk_buff          *pktoptions;
291         struct sk_buff          *rxpmtu;
292         struct inet6_cork       cork;
293 };
294 
295 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
296 struct raw6_sock {
297         /* inet_sock has to be the first member of raw6_sock */
298         struct inet_sock        inet;
299         __u32                   checksum;       /* perform checksum */
300         __u32                   offset;         /* checksum offset  */
301         struct icmp6_filter     filter;
302         __u32                   ip6mr_table;
303         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
304         struct ipv6_pinfo       inet6;
305 };
306 
307 struct udp6_sock {
308         struct udp_sock   udp;
309         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
310         struct ipv6_pinfo inet6;
311 };
312 
313 struct tcp6_sock {
314         struct tcp_sock   tcp;
315         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
316         struct ipv6_pinfo inet6;
317 };
318 
319 extern int inet6_sk_rebuild_header(struct sock *sk);
320 
321 struct tcp6_timewait_sock {
322         struct tcp_timewait_sock   tcp6tw_tcp;
323 };
324 
325 #if IS_ENABLED(CONFIG_IPV6)
326 bool ipv6_mod_enabled(void);
327 
328 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
329 {
330         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
331 }
332 
333 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
334 {
335         return (struct raw6_sock *)sk;
336 }
337 
338 static inline void inet_sk_copy_descendant(struct sock *sk_to,
339                                            const struct sock *sk_from)
340 {
341         int ancestor_size = sizeof(struct inet_sock);
342 
343         if (sk_from->sk_family == PF_INET6)
344                 ancestor_size += sizeof(struct ipv6_pinfo);
345 
346         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
347 }
348 
349 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
350 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
351 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
352                                  inet6_sk(sk)->rxopt.bits.rxinfo)
353 
354 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
355 {
356         if (sk->sk_family == AF_INET6)
357                 return &sk->sk_v6_rcv_saddr;
358         return NULL;
359 }
360 
361 static inline int inet_v6_ipv6only(const struct sock *sk)
362 {
363         /* ipv6only field is at same position for timewait and other sockets */
364         return ipv6_only_sock(sk);
365 }
366 #else
367 #define __ipv6_only_sock(sk)    0
368 #define ipv6_only_sock(sk)      0
369 #define ipv6_sk_rxinfo(sk)      0
370 
371 static inline bool ipv6_mod_enabled(void)
372 {
373         return false;
374 }
375 
376 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
377 {
378         return NULL;
379 }
380 
381 static inline struct inet6_request_sock *
382                         inet6_rsk(const struct request_sock *rsk)
383 {
384         return NULL;
385 }
386 
387 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
388 {
389         return NULL;
390 }
391 
392 #define inet6_rcv_saddr(__sk)   NULL
393 #define tcp_twsk_ipv6only(__sk)         0
394 #define inet_v6_ipv6only(__sk)          0
395 #endif /* IS_ENABLED(CONFIG_IPV6) */
396 #endif /* _IPV6_H */
397 

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