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 */
12struct 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_pinfo;
37 __s32 ignore_routes_with_linkdown;
38#ifdef CONFIG_IPV6_ROUTER_PREF
39 __s32 accept_ra_rtr_pref;
40 __s32 rtr_probe_interval;
41#ifdef CONFIG_IPV6_ROUTE_INFO
42 __s32 accept_ra_rt_info_min_plen;
43 __s32 accept_ra_rt_info_max_plen;
44#endif
45#endif
46 __s32 proxy_ndp;
47 __s32 accept_source_route;
48 __s32 accept_ra_from_local;
49#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
50 __s32 optimistic_dad;
51 __s32 use_optimistic;
52#endif
53#ifdef CONFIG_IPV6_MROUTE
54 atomic_t mc_forwarding;
55#endif
56 __s32 disable_ipv6;
57 __s32 drop_unicast_in_l2_multicast;
58 __s32 accept_dad;
59 __s32 force_tllao;
60 __s32 ndisc_notify;
61 __s32 suppress_frag_ndisc;
62 __s32 accept_ra_mtu;
63 __s32 drop_unsolicited_na;
64 __s32 accept_untracked_na;
65 struct ipv6_stable_secret {
66 bool initialized;
67 struct in6_addr secret;
68 } stable_secret;
69 __s32 use_oif_addrs_only;
70 __s32 keep_addr_on_down;
71 __s32 seg6_enabled;
72#ifdef CONFIG_IPV6_SEG6_HMAC
73 __s32 seg6_require_hmac;
74#endif
75 __u32 enhanced_dad;
76 __u32 addr_gen_mode;
77 __s32 disable_policy;
78 __s32 ndisc_tclass;
79 __s32 rpl_seg_enabled;
80 __u32 ioam6_id;
81 __u32 ioam6_id_wide;
82 __u8 ioam6_enabled;
83 __u8 ndisc_evict_nocarrier;
84
85 struct ctl_table_header *sysctl_header;
86};
87
88struct ipv6_params {
89 __s32 disable_ipv6;
90 __s32 autoconf;
91};
92extern struct ipv6_params ipv6_defaults;
93#include <linux/tcp.h>
94#include <linux/udp.h>
95
96#include <net/inet_sock.h>
97
98static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
99{
100 return (struct ipv6hdr *)skb_network_header(skb);
101}
102
103static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
104{
105 return (struct ipv6hdr *)skb_inner_network_header(skb);
106}
107
108static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
109{
110 return (struct ipv6hdr *)skb_transport_header(skb);
111}
112
113static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
114{
115 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
116 skb_network_header_len(skb);
117}
118
119/*
120 This structure contains results of exthdrs parsing
121 as offsets from skb->nh.
122 */
123
124struct inet6_skb_parm {
125 int iif;
126 __be16 ra;
127 __u16 dst0;
128 __u16 srcrt;
129 __u16 dst1;
130 __u16 lastopt;
131 __u16 nhoff;
132 __u16 flags;
133#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
134 __u16 dsthao;
135#endif
136 __u16 frag_max_size;
137 __u16 srhoff;
138
139#define IP6SKB_XFRM_TRANSFORMED 1
140#define IP6SKB_FORWARDED 2
141#define IP6SKB_REROUTED 4
142#define IP6SKB_ROUTERALERT 8
143#define IP6SKB_FRAGMENTED 16
144#define IP6SKB_HOPBYHOP 32
145#define IP6SKB_L3SLAVE 64
146#define IP6SKB_JUMBOGRAM 128
147#define IP6SKB_SEG6 256
148#define IP6SKB_FAKEJUMBO 512
149};
150
151#if defined(CONFIG_NET_L3_MASTER_DEV)
152static inline bool ipv6_l3mdev_skb(__u16 flags)
153{
154 return flags & IP6SKB_L3SLAVE;
155}
156#else
157static inline bool ipv6_l3mdev_skb(__u16 flags)
158{
159 return false;
160}
161#endif
162
163#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
164#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
165
166static inline int inet6_iif(const struct sk_buff *skb)
167{
168 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
169
170 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
171}
172
173static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
174{
175 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
176}
177
178/* can not be used in TCP layer after tcp_v6_fill_cb */
179static inline int inet6_sdif(const struct sk_buff *skb)
180{
181#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
182 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
183 return IP6CB(skb)->iif;
184#endif
185 return 0;
186}
187
188struct tcp6_request_sock {
189 struct tcp_request_sock tcp6rsk_tcp;
190};
191
192struct ipv6_mc_socklist;
193struct ipv6_ac_socklist;
194struct ipv6_fl_socklist;
195
196struct inet6_cork {
197 struct ipv6_txoptions *opt;
198 u8 hop_limit;
199 u8 tclass;
200};
201
202/**
203 * struct ipv6_pinfo - ipv6 private area
204 *
205 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
206 * this _must_ be the last member, so that inet6_sk_generic
207 * is able to calculate its offset from the base struct sock
208 * by using the struct proto->slab_obj_size member. -acme
209 */
210struct ipv6_pinfo {
211 struct in6_addr saddr;
212 struct in6_pktinfo sticky_pktinfo;
213 const struct in6_addr *daddr_cache;
214#ifdef CONFIG_IPV6_SUBTREES
215 const struct in6_addr *saddr_cache;
216#endif
217
218 __be32 flow_label;
219 __u32 frag_size;
220
221 /*
222 * Packed in 16bits.
223 * Omit one shift by putting the signed field at MSB.
224 */
225#if defined(__BIG_ENDIAN_BITFIELD)
226 __s16 hop_limit:9;
227 __u16 __unused_1:7;
228#else
229 __u16 __unused_1:7;
230 __s16 hop_limit:9;
231#endif
232
233#if defined(__BIG_ENDIAN_BITFIELD)
234 /* Packed in 16bits. */
235 __s16 mcast_hops:9;
236 __u16 __unused_2:6,
237 mc_loop:1;
238#else
239 __u16 mc_loop:1,
240 __unused_2:6;
241 __s16 mcast_hops:9;
242#endif
243 int ucast_oif;
244 int mcast_oif;
245
246 /* pktoption flags */
247 union {
248 struct {
249 __u16 srcrt:1,
250 osrcrt:1,
251 rxinfo:1,
252 rxoinfo:1,
253 rxhlim:1,
254 rxohlim:1,
255 hopopts:1,
256 ohopopts:1,
257 dstopts:1,
258 odstopts:1,
259 rxflow:1,
260 rxtclass:1,
261 rxpmtu:1,
262 rxorigdstaddr:1,
263 recvfragsize:1;
264 /* 1 bits hole */
265 } bits;
266 __u16 all;
267 } rxopt;
268
269 /* sockopt flags */
270 __u16 recverr:1,
271 sndflow:1,
272 repflow:1,
273 pmtudisc:3,
274 padding:1, /* 1 bit hole */
275 srcprefs:3, /* 001: prefer temporary address
276 * 010: prefer public address
277 * 100: prefer care-of address
278 */
279 dontfrag:1,
280 autoflowlabel:1,
281 autoflowlabel_set:1,
282 mc_all:1,
283 recverr_rfc4884:1,
284 rtalert_isolate:1;
285 __u8 min_hopcount;
286 __u8 tclass;
287 __be32 rcv_flowinfo;
288
289 __u32 dst_cookie;
290
291 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
292 struct ipv6_ac_socklist *ipv6_ac_list;
293 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
294
295 struct ipv6_txoptions __rcu *opt;
296 struct sk_buff *pktoptions;
297 struct sk_buff *rxpmtu;
298 struct inet6_cork cork;
299};
300
301/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
302struct raw6_sock {
303 /* inet_sock has to be the first member of raw6_sock */
304 struct inet_sock inet;
305 __u32 checksum; /* perform checksum */
306 __u32 offset; /* checksum offset */
307 struct icmp6_filter filter;
308 __u32 ip6mr_table;
309 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
310 struct ipv6_pinfo inet6;
311};
312
313struct udp6_sock {
314 struct udp_sock udp;
315 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
316 struct ipv6_pinfo inet6;
317};
318
319struct tcp6_sock {
320 struct tcp_sock tcp;
321 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
322 struct ipv6_pinfo inet6;
323};
324
325extern int inet6_sk_rebuild_header(struct sock *sk);
326
327struct tcp6_timewait_sock {
328 struct tcp_timewait_sock tcp6tw_tcp;
329};
330
331#if IS_ENABLED(CONFIG_IPV6)
332bool ipv6_mod_enabled(void);
333
334static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
335{
336 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
337}
338
339static inline struct raw6_sock *raw6_sk(const struct sock *sk)
340{
341 return (struct raw6_sock *)sk;
342}
343
344#define ipv6_only_sock(sk) (sk->sk_ipv6only)
345#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
346 inet6_sk(sk)->rxopt.bits.rxinfo)
347
348static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
349{
350 if (sk->sk_family == AF_INET6)
351 return &sk->sk_v6_rcv_saddr;
352 return NULL;
353}
354
355static inline int inet_v6_ipv6only(const struct sock *sk)
356{
357 /* ipv6only field is at same position for timewait and other sockets */
358 return ipv6_only_sock(sk);
359}
360#else
361#define ipv6_only_sock(sk) 0
362#define ipv6_sk_rxinfo(sk) 0
363
364static inline bool ipv6_mod_enabled(void)
365{
366 return false;
367}
368
369static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
370{
371 return NULL;
372}
373
374static 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 inet_v6_ipv6only(__sk) 0
381#endif /* IS_ENABLED(CONFIG_IPV6) */
382#endif /* _IPV6_H */
383

source code of linux/include/linux/ipv6.h