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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         __s32           rpl_seg_enabled;
 78 
 79         struct ctl_table_header *sysctl_header;
 80 };
 81 
 82 struct ipv6_params {
 83         __s32 disable_ipv6;
 84         __s32 autoconf;
 85 };
 86 extern struct ipv6_params ipv6_defaults;
 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 struct tcp6_request_sock {
180         struct tcp_request_sock   tcp6rsk_tcp;
181 };
182 
183 struct ipv6_mc_socklist;
184 struct ipv6_ac_socklist;
185 struct ipv6_fl_socklist;
186 
187 struct inet6_cork {
188         struct ipv6_txoptions *opt;
189         u8 hop_limit;
190         u8 tclass;
191 };
192 
193 /**
194  * struct ipv6_pinfo - ipv6 private area
195  *
196  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
197  * this _must_ be the last member, so that inet6_sk_generic
198  * is able to calculate its offset from the base struct sock
199  * by using the struct proto->slab_obj_size member. -acme
200  */
201 struct ipv6_pinfo {
202         struct in6_addr         saddr;
203         struct in6_pktinfo      sticky_pktinfo;
204         const struct in6_addr           *daddr_cache;
205 #ifdef CONFIG_IPV6_SUBTREES
206         const struct in6_addr           *saddr_cache;
207 #endif
208 
209         __be32                  flow_label;
210         __u32                   frag_size;
211 
212         /*
213          * Packed in 16bits.
214          * Omit one shift by putting the signed field at MSB.
215          */
216 #if defined(__BIG_ENDIAN_BITFIELD)
217         __s16                   hop_limit:9;
218         __u16                   __unused_1:7;
219 #else
220         __u16                   __unused_1:7;
221         __s16                   hop_limit:9;
222 #endif
223 
224 #if defined(__BIG_ENDIAN_BITFIELD)
225         /* Packed in 16bits. */
226         __s16                   mcast_hops:9;
227         __u16                   __unused_2:6,
228                                 mc_loop:1;
229 #else
230         __u16                   mc_loop:1,
231                                 __unused_2:6;
232         __s16                   mcast_hops:9;
233 #endif
234         int                     ucast_oif;
235         int                     mcast_oif;
236 
237         /* pktoption flags */
238         union {
239                 struct {
240                         __u16   srcrt:1,
241                                 osrcrt:1,
242                                 rxinfo:1,
243                                 rxoinfo:1,
244                                 rxhlim:1,
245                                 rxohlim:1,
246                                 hopopts:1,
247                                 ohopopts:1,
248                                 dstopts:1,
249                                 odstopts:1,
250                                 rxflow:1,
251                                 rxtclass:1,
252                                 rxpmtu:1,
253                                 rxorigdstaddr:1,
254                                 recvfragsize:1;
255                                 /* 1 bits hole */
256                 } bits;
257                 __u16           all;
258         } rxopt;
259 
260         /* sockopt flags */
261         __u16                   recverr:1,
262                                 sndflow:1,
263                                 repflow:1,
264                                 pmtudisc:3,
265                                 padding:1,      /* 1 bit hole */
266                                 srcprefs:3,     /* 001: prefer temporary address
267                                                  * 010: prefer public address
268                                                  * 100: prefer care-of address
269                                                  */
270                                 dontfrag:1,
271                                 autoflowlabel:1,
272                                 autoflowlabel_set:1,
273                                 mc_all:1,
274                                 recverr_rfc4884:1,
275                                 rtalert_isolate:1;
276         __u8                    min_hopcount;
277         __u8                    tclass;
278         __be32                  rcv_flowinfo;
279 
280         __u32                   dst_cookie;
281         __u32                   rx_dst_cookie;
282 
283         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
284         struct ipv6_ac_socklist *ipv6_ac_list;
285         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
286 
287         struct ipv6_txoptions __rcu     *opt;
288         struct sk_buff          *pktoptions;
289         struct sk_buff          *rxpmtu;
290         struct inet6_cork       cork;
291 };
292 
293 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
294 struct raw6_sock {
295         /* inet_sock has to be the first member of raw6_sock */
296         struct inet_sock        inet;
297         __u32                   checksum;       /* perform checksum */
298         __u32                   offset;         /* checksum offset  */
299         struct icmp6_filter     filter;
300         __u32                   ip6mr_table;
301         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
302         struct ipv6_pinfo       inet6;
303 };
304 
305 struct udp6_sock {
306         struct udp_sock   udp;
307         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
308         struct ipv6_pinfo inet6;
309 };
310 
311 struct tcp6_sock {
312         struct tcp_sock   tcp;
313         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
314         struct ipv6_pinfo inet6;
315 };
316 
317 extern int inet6_sk_rebuild_header(struct sock *sk);
318 
319 struct tcp6_timewait_sock {
320         struct tcp_timewait_sock   tcp6tw_tcp;
321 };
322 
323 #if IS_ENABLED(CONFIG_IPV6)
324 bool ipv6_mod_enabled(void);
325 
326 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
327 {
328         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
329 }
330 
331 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
332 {
333         return (struct raw6_sock *)sk;
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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