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

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