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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 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
108 {
109         return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
110                skb_network_header_len(skb);
111 }
112 
113 /* 
114    This structure contains results of exthdrs parsing
115    as offsets from skb->nh.
116  */
117 
118 struct inet6_skb_parm {
119         int                     iif;
120         __be16                  ra;
121         __u16                   dst0;
122         __u16                   srcrt;
123         __u16                   dst1;
124         __u16                   lastopt;
125         __u16                   nhoff;
126         __u16                   flags;
127 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
128         __u16                   dsthao;
129 #endif
130         __u16                   frag_max_size;
131 
132 #define IP6SKB_XFRM_TRANSFORMED 1
133 #define IP6SKB_FORWARDED        2
134 #define IP6SKB_REROUTED         4
135 #define IP6SKB_ROUTERALERT      8
136 #define IP6SKB_FRAGMENTED      16
137 #define IP6SKB_HOPBYHOP        32
138 #define IP6SKB_L3SLAVE         64
139 #define IP6SKB_JUMBOGRAM      128
140 };
141 
142 #if defined(CONFIG_NET_L3_MASTER_DEV)
143 static inline bool ipv6_l3mdev_skb(__u16 flags)
144 {
145         return flags & IP6SKB_L3SLAVE;
146 }
147 #else
148 static inline bool ipv6_l3mdev_skb(__u16 flags)
149 {
150         return false;
151 }
152 #endif
153 
154 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
155 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
156 
157 static inline int inet6_iif(const struct sk_buff *skb)
158 {
159         bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
160 
161         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
162 }
163 
164 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
165 {
166         return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
167 }
168 
169 /* can not be used in TCP layer after tcp_v6_fill_cb */
170 static inline int inet6_sdif(const struct sk_buff *skb)
171 {
172 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
173         if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
174                 return IP6CB(skb)->iif;
175 #endif
176         return 0;
177 }
178 
179 /* can not be used in TCP layer after tcp_v6_fill_cb */
180 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
181 {
182 #if defined(CONFIG_NET_L3_MASTER_DEV)
183         if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
184             skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
185                 return true;
186 #endif
187         return false;
188 }
189 
190 struct tcp6_request_sock {
191         struct tcp_request_sock   tcp6rsk_tcp;
192 };
193 
194 struct ipv6_mc_socklist;
195 struct ipv6_ac_socklist;
196 struct ipv6_fl_socklist;
197 
198 struct inet6_cork {
199         struct ipv6_txoptions *opt;
200         u8 hop_limit;
201         u8 tclass;
202 };
203 
204 /**
205  * struct ipv6_pinfo - ipv6 private area
206  *
207  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
208  * this _must_ be the last member, so that inet6_sk_generic
209  * is able to calculate its offset from the base struct sock
210  * by using the struct proto->slab_obj_size member. -acme
211  */
212 struct ipv6_pinfo {
213         struct in6_addr         saddr;
214         struct in6_pktinfo      sticky_pktinfo;
215         const struct in6_addr           *daddr_cache;
216 #ifdef CONFIG_IPV6_SUBTREES
217         const struct in6_addr           *saddr_cache;
218 #endif
219 
220         __be32                  flow_label;
221         __u32                   frag_size;
222 
223         /*
224          * Packed in 16bits.
225          * Omit one shift by by putting the signed field at MSB.
226          */
227 #if defined(__BIG_ENDIAN_BITFIELD)
228         __s16                   hop_limit:9;
229         __u16                   __unused_1:7;
230 #else
231         __u16                   __unused_1:7;
232         __s16                   hop_limit:9;
233 #endif
234 
235 #if defined(__BIG_ENDIAN_BITFIELD)
236         /* Packed in 16bits. */
237         __s16                   mcast_hops:9;
238         __u16                   __unused_2:6,
239                                 mc_loop:1;
240 #else
241         __u16                   mc_loop:1,
242                                 __unused_2:6;
243         __s16                   mcast_hops:9;
244 #endif
245         int                     ucast_oif;
246         int                     mcast_oif;
247 
248         /* pktoption flags */
249         union {
250                 struct {
251                         __u16   srcrt:1,
252                                 osrcrt:1,
253                                 rxinfo:1,
254                                 rxoinfo:1,
255                                 rxhlim:1,
256                                 rxohlim:1,
257                                 hopopts:1,
258                                 ohopopts:1,
259                                 dstopts:1,
260                                 odstopts:1,
261                                 rxflow:1,
262                                 rxtclass:1,
263                                 rxpmtu:1,
264                                 rxorigdstaddr:1,
265                                 recvfragsize:1;
266                                 /* 1 bits hole */
267                 } bits;
268                 __u16           all;
269         } rxopt;
270 
271         /* sockopt flags */
272         __u16                   recverr:1,
273                                 sndflow:1,
274                                 repflow:1,
275                                 pmtudisc:3,
276                                 padding:1,      /* 1 bit hole */
277                                 srcprefs:3,     /* 001: prefer temporary address
278                                                  * 010: prefer public address
279                                                  * 100: prefer care-of address
280                                                  */
281                                 dontfrag:1,
282                                 autoflowlabel:1,
283                                 autoflowlabel_set:1,
284                                 mc_all:1,
285                                 rtalert_isolate:1;
286         __u8                    min_hopcount;
287         __u8                    tclass;
288         __be32                  rcv_flowinfo;
289 
290         __u32                   dst_cookie;
291         __u32                   rx_dst_cookie;
292 
293         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
294         struct ipv6_ac_socklist *ipv6_ac_list;
295         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
296 
297         struct ipv6_txoptions __rcu     *opt;
298         struct sk_buff          *pktoptions;
299         struct sk_buff          *rxpmtu;
300         struct inet6_cork       cork;
301 };
302 
303 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
304 struct raw6_sock {
305         /* inet_sock has to be the first member of raw6_sock */
306         struct inet_sock        inet;
307         __u32                   checksum;       /* perform checksum */
308         __u32                   offset;         /* checksum offset  */
309         struct icmp6_filter     filter;
310         __u32                   ip6mr_table;
311         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
312         struct ipv6_pinfo       inet6;
313 };
314 
315 struct udp6_sock {
316         struct udp_sock   udp;
317         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
318         struct ipv6_pinfo inet6;
319 };
320 
321 struct tcp6_sock {
322         struct tcp_sock   tcp;
323         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
324         struct ipv6_pinfo inet6;
325 };
326 
327 extern int inet6_sk_rebuild_header(struct sock *sk);
328 
329 struct tcp6_timewait_sock {
330         struct tcp_timewait_sock   tcp6tw_tcp;
331 };
332 
333 #if IS_ENABLED(CONFIG_IPV6)
334 bool ipv6_mod_enabled(void);
335 
336 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
337 {
338         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
339 }
340 
341 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
342 {
343         return (struct raw6_sock *)sk;
344 }
345 
346 static inline void inet_sk_copy_descendant(struct sock *sk_to,
347                                            const struct sock *sk_from)
348 {
349         int ancestor_size = sizeof(struct inet_sock);
350 
351         if (sk_from->sk_family == PF_INET6)
352                 ancestor_size += sizeof(struct ipv6_pinfo);
353 
354         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
355 }
356 
357 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
358 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
359 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
360                                  inet6_sk(sk)->rxopt.bits.rxinfo)
361 
362 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
363 {
364         if (sk->sk_family == AF_INET6)
365                 return &sk->sk_v6_rcv_saddr;
366         return NULL;
367 }
368 
369 static inline int inet_v6_ipv6only(const struct sock *sk)
370 {
371         /* ipv6only field is at same position for timewait and other sockets */
372         return ipv6_only_sock(sk);
373 }
374 #else
375 #define __ipv6_only_sock(sk)    0
376 #define ipv6_only_sock(sk)      0
377 #define ipv6_sk_rxinfo(sk)      0
378 
379 static inline bool ipv6_mod_enabled(void)
380 {
381         return false;
382 }
383 
384 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
385 {
386         return NULL;
387 }
388 
389 static inline struct inet6_request_sock *
390                         inet6_rsk(const struct request_sock *rsk)
391 {
392         return NULL;
393 }
394 
395 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
396 {
397         return NULL;
398 }
399 
400 #define inet6_rcv_saddr(__sk)   NULL
401 #define tcp_twsk_ipv6only(__sk)         0
402 #define inet_v6_ipv6only(__sk)          0
403 #endif /* IS_ENABLED(CONFIG_IPV6) */
404 #endif /* _IPV6_H */
405 

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