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[linux.git] / include / linux / ipv6.h
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         __u32           ra_defrtr_metric;
35         __s32           accept_ra_min_hop_limit;
36         __s32           accept_ra_min_lft;
37         __s32           accept_ra_pinfo;
38         __s32           ignore_routes_with_linkdown;
39 #ifdef CONFIG_IPV6_ROUTER_PREF
40         __s32           accept_ra_rtr_pref;
41         __s32           rtr_probe_interval;
42 #ifdef CONFIG_IPV6_ROUTE_INFO
43         __s32           accept_ra_rt_info_min_plen;
44         __s32           accept_ra_rt_info_max_plen;
45 #endif
46 #endif
47         __s32           proxy_ndp;
48         __s32           accept_source_route;
49         __s32           accept_ra_from_local;
50 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
51         __s32           optimistic_dad;
52         __s32           use_optimistic;
53 #endif
54 #ifdef CONFIG_IPV6_MROUTE
55         atomic_t        mc_forwarding;
56 #endif
57         __s32           disable_ipv6;
58         __s32           drop_unicast_in_l2_multicast;
59         __s32           accept_dad;
60         __s32           force_tllao;
61         __s32           ndisc_notify;
62         __s32           suppress_frag_ndisc;
63         __s32           accept_ra_mtu;
64         __s32           drop_unsolicited_na;
65         __s32           accept_untracked_na;
66         struct ipv6_stable_secret {
67                 bool initialized;
68                 struct in6_addr secret;
69         } stable_secret;
70         __s32           use_oif_addrs_only;
71         __s32           keep_addr_on_down;
72         __s32           seg6_enabled;
73 #ifdef CONFIG_IPV6_SEG6_HMAC
74         __s32           seg6_require_hmac;
75 #endif
76         __u32           enhanced_dad;
77         __u32           addr_gen_mode;
78         __s32           disable_policy;
79         __s32           ndisc_tclass;
80         __s32           rpl_seg_enabled;
81         __u32           ioam6_id;
82         __u32           ioam6_id_wide;
83         __u8            ioam6_enabled;
84         __u8            ndisc_evict_nocarrier;
85
86         struct ctl_table_header *sysctl_header;
87 };
88
89 struct ipv6_params {
90         __s32 disable_ipv6;
91         __s32 autoconf;
92 };
93 extern struct ipv6_params ipv6_defaults;
94 #include <linux/tcp.h>
95 #include <linux/udp.h>
96
97 #include <net/inet_sock.h>
98
99 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
100 {
101         return (struct ipv6hdr *)skb_network_header(skb);
102 }
103
104 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
105 {
106         return (struct ipv6hdr *)skb_inner_network_header(skb);
107 }
108
109 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
110 {
111         return (struct ipv6hdr *)skb_transport_header(skb);
112 }
113
114 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
115 {
116         return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
117                skb_network_header_len(skb);
118 }
119
120 /* 
121    This structure contains results of exthdrs parsing
122    as offsets from skb->nh.
123  */
124
125 struct inet6_skb_parm {
126         int                     iif;
127         __be16                  ra;
128         __u16                   dst0;
129         __u16                   srcrt;
130         __u16                   dst1;
131         __u16                   lastopt;
132         __u16                   nhoff;
133         __u16                   flags;
134 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
135         __u16                   dsthao;
136 #endif
137         __u16                   frag_max_size;
138         __u16                   srhoff;
139
140 #define IP6SKB_XFRM_TRANSFORMED 1
141 #define IP6SKB_FORWARDED        2
142 #define IP6SKB_REROUTED         4
143 #define IP6SKB_ROUTERALERT      8
144 #define IP6SKB_FRAGMENTED      16
145 #define IP6SKB_HOPBYHOP        32
146 #define IP6SKB_L3SLAVE         64
147 #define IP6SKB_JUMBOGRAM      128
148 #define IP6SKB_SEG6           256
149 #define IP6SKB_FAKEJUMBO      512
150 };
151
152 #if defined(CONFIG_NET_L3_MASTER_DEV)
153 static inline bool ipv6_l3mdev_skb(__u16 flags)
154 {
155         return flags & IP6SKB_L3SLAVE;
156 }
157 #else
158 static inline bool ipv6_l3mdev_skb(__u16 flags)
159 {
160         return false;
161 }
162 #endif
163
164 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
165 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
166
167 static inline int inet6_iif(const struct sk_buff *skb)
168 {
169         bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
170
171         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
172 }
173
174 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
175 {
176         return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
177 }
178
179 /* can not be used in TCP layer after tcp_v6_fill_cb */
180 static inline int inet6_sdif(const struct sk_buff *skb)
181 {
182 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
183         if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
184                 return IP6CB(skb)->iif;
185 #endif
186         return 0;
187 }
188
189 struct tcp6_request_sock {
190         struct tcp_request_sock   tcp6rsk_tcp;
191 };
192
193 struct ipv6_mc_socklist;
194 struct ipv6_ac_socklist;
195 struct ipv6_fl_socklist;
196
197 struct inet6_cork {
198         struct ipv6_txoptions *opt;
199         u8 hop_limit;
200         u8 tclass;
201 };
202
203 /* struct ipv6_pinfo - ipv6 private area */
204 struct ipv6_pinfo {
205         struct in6_addr         saddr;
206         struct in6_pktinfo      sticky_pktinfo;
207         const struct in6_addr           *daddr_cache;
208 #ifdef CONFIG_IPV6_SUBTREES
209         const struct in6_addr           *saddr_cache;
210 #endif
211
212         __be32                  flow_label;
213         __u32                   frag_size;
214
215         /*
216          * Packed in 16bits.
217          * Omit one shift by putting the signed field at MSB.
218          */
219 #if defined(__BIG_ENDIAN_BITFIELD)
220         __s16                   hop_limit:9;
221         __u16                   __unused_1:7;
222 #else
223         __u16                   __unused_1:7;
224         __s16                   hop_limit:9;
225 #endif
226
227 #if defined(__BIG_ENDIAN_BITFIELD)
228         /* Packed in 16bits. */
229         __s16                   mcast_hops:9;
230         __u16                   __unused_2:6,
231                                 mc_loop:1;
232 #else
233         __u16                   mc_loop:1,
234                                 __unused_2:6;
235         __s16                   mcast_hops:9;
236 #endif
237         int                     ucast_oif;
238         int                     mcast_oif;
239
240         /* pktoption flags */
241         union {
242                 struct {
243                         __u16   srcrt:1,
244                                 osrcrt:1,
245                                 rxinfo:1,
246                                 rxoinfo:1,
247                                 rxhlim:1,
248                                 rxohlim:1,
249                                 hopopts:1,
250                                 ohopopts:1,
251                                 dstopts:1,
252                                 odstopts:1,
253                                 rxflow:1,
254                                 rxtclass:1,
255                                 rxpmtu:1,
256                                 rxorigdstaddr:1,
257                                 recvfragsize:1;
258                                 /* 1 bits hole */
259                 } bits;
260                 __u16           all;
261         } rxopt;
262
263         /* sockopt flags */
264         __u16                   recverr:1,
265                                 sndflow:1,
266                                 repflow:1,
267                                 pmtudisc:3,
268                                 padding:1,      /* 1 bit hole */
269                                 srcprefs:3,     /* 001: prefer temporary address
270                                                  * 010: prefer public address
271                                                  * 100: prefer care-of address
272                                                  */
273                                 dontfrag:1,
274                                 autoflowlabel:1,
275                                 autoflowlabel_set:1,
276                                 mc_all:1,
277                                 recverr_rfc4884:1,
278                                 rtalert_isolate:1;
279         __u8                    min_hopcount;
280         __u8                    tclass;
281         __be32                  rcv_flowinfo;
282
283         __u32                   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
304         struct ipv6_pinfo       inet6;
305 };
306
307 struct udp6_sock {
308         struct udp_sock   udp;
309
310         struct ipv6_pinfo inet6;
311 };
312
313 struct tcp6_sock {
314         struct tcp_sock   tcp;
315
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 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk)
334
335 #define ipv6_only_sock(sk)      (sk->sk_ipv6only)
336 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
337                                  inet6_sk(sk)->rxopt.bits.rxinfo)
338
339 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
340 {
341         if (sk->sk_family == AF_INET6)
342                 return &sk->sk_v6_rcv_saddr;
343         return NULL;
344 }
345
346 static inline int inet_v6_ipv6only(const struct sock *sk)
347 {
348         /* ipv6only field is at same position for timewait and other sockets */
349         return ipv6_only_sock(sk);
350 }
351 #else
352 #define ipv6_only_sock(sk)      0
353 #define ipv6_sk_rxinfo(sk)      0
354
355 static inline bool ipv6_mod_enabled(void)
356 {
357         return false;
358 }
359
360 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
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 inet_v6_ipv6only(__sk)          0
372 #endif /* IS_ENABLED(CONFIG_IPV6) */
373 #endif /* _IPV6_H */
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