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 __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
81struct ipv6_params {
82 __s32 disable_ipv6;
83 __s32 autoconf;
84};
85extern 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
92static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
93{
94 return (struct ipv6hdr *)skb_network_header(skb);
95}
96
97static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
98{
99 return (struct ipv6hdr *)skb_inner_network_header(skb);
100}
101
102static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
103{
104 return (struct ipv6hdr *)skb_transport_header(skb);
105}
106
107/*
108 This structure contains results of exthdrs parsing
109 as offsets from skb->nh.
110 */
111
112struct inet6_skb_parm {
113 int iif;
114 __be16 ra;
115 __u16 dst0;
116 __u16 srcrt;
117 __u16 dst1;
118 __u16 lastopt;
119 __u16 nhoff;
120 __u16 flags;
121#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
122 __u16 dsthao;
123#endif
124 __u16 frag_max_size;
125
126#define IP6SKB_XFRM_TRANSFORMED 1
127#define IP6SKB_FORWARDED 2
128#define IP6SKB_REROUTED 4
129#define IP6SKB_ROUTERALERT 8
130#define IP6SKB_FRAGMENTED 16
131#define IP6SKB_HOPBYHOP 32
132#define IP6SKB_L3SLAVE 64
133#define IP6SKB_JUMBOGRAM 128
134};
135
136#if defined(CONFIG_NET_L3_MASTER_DEV)
137static inline bool ipv6_l3mdev_skb(__u16 flags)
138{
139 return flags & IP6SKB_L3SLAVE;
140}
141#else
142static inline bool ipv6_l3mdev_skb(__u16 flags)
143{
144 return false;
145}
146#endif
147
148#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
149#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
150
151static inline int inet6_iif(const struct sk_buff *skb)
152{
153 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
154
155 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
156}
157
158static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
159{
160 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
161}
162
163/* can not be used in TCP layer after tcp_v6_fill_cb */
164static inline int inet6_sdif(const struct sk_buff *skb)
165{
166#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
167 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
168 return IP6CB(skb)->iif;
169#endif
170 return 0;
171}
172
173/* can not be used in TCP layer after tcp_v6_fill_cb */
174static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
175{
176#if defined(CONFIG_NET_L3_MASTER_DEV)
177 if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
178 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
179 return true;
180#endif
181 return false;
182}
183
184struct tcp6_request_sock {
185 struct tcp_request_sock tcp6rsk_tcp;
186};
187
188struct ipv6_mc_socklist;
189struct ipv6_ac_socklist;
190struct ipv6_fl_socklist;
191
192struct inet6_cork {
193 struct ipv6_txoptions *opt;
194 u8 hop_limit;
195 u8 tclass;
196};
197
198/**
199 * struct ipv6_pinfo - ipv6 private area
200 *
201 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
202 * this _must_ be the last member, so that inet6_sk_generic
203 * is able to calculate its offset from the base struct sock
204 * by using the struct proto->slab_obj_size member. -acme
205 */
206struct ipv6_pinfo {
207 struct in6_addr saddr;
208 struct in6_pktinfo sticky_pktinfo;
209 const struct in6_addr *daddr_cache;
210#ifdef CONFIG_IPV6_SUBTREES
211 const struct in6_addr *saddr_cache;
212#endif
213
214 __be32 flow_label;
215 __u32 frag_size;
216
217 /*
218 * Packed in 16bits.
219 * Omit one shift by by putting the signed field at MSB.
220 */
221#if defined(__BIG_ENDIAN_BITFIELD)
222 __s16 hop_limit:9;
223 __u16 __unused_1:7;
224#else
225 __u16 __unused_1:7;
226 __s16 hop_limit:9;
227#endif
228
229#if defined(__BIG_ENDIAN_BITFIELD)
230 /* Packed in 16bits. */
231 __s16 mcast_hops:9;
232 __u16 __unused_2:6,
233 mc_loop:1;
234#else
235 __u16 mc_loop:1,
236 __unused_2:6;
237 __s16 mcast_hops:9;
238#endif
239 int ucast_oif;
240 int mcast_oif;
241
242 /* pktoption flags */
243 union {
244 struct {
245 __u16 srcrt:1,
246 osrcrt:1,
247 rxinfo:1,
248 rxoinfo:1,
249 rxhlim:1,
250 rxohlim:1,
251 hopopts:1,
252 ohopopts:1,
253 dstopts:1,
254 odstopts:1,
255 rxflow:1,
256 rxtclass:1,
257 rxpmtu:1,
258 rxorigdstaddr:1,
259 recvfragsize:1;
260 /* 1 bits hole */
261 } bits;
262 __u16 all;
263 } rxopt;
264
265 /* sockopt flags */
266 __u16 recverr:1,
267 sndflow:1,
268 repflow:1,
269 pmtudisc:3,
270 padding:1, /* 1 bit hole */
271 srcprefs:3, /* 001: prefer temporary address
272 * 010: prefer public address
273 * 100: prefer care-of address
274 */
275 dontfrag:1,
276 autoflowlabel:1,
277 autoflowlabel_set:1;
278 __u8 min_hopcount;
279 __u8 tclass;
280 __be32 rcv_flowinfo;
281
282 __u32 dst_cookie;
283 __u32 rx_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! */
296struct 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 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
304 struct ipv6_pinfo inet6;
305};
306
307struct udp6_sock {
308 struct udp_sock udp;
309 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
310 struct ipv6_pinfo inet6;
311};
312
313struct tcp6_sock {
314 struct tcp_sock tcp;
315 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
316 struct ipv6_pinfo inet6;
317};
318
319extern int inet6_sk_rebuild_header(struct sock *sk);
320
321struct tcp6_timewait_sock {
322 struct tcp_timewait_sock tcp6tw_tcp;
323};
324
325#if IS_ENABLED(CONFIG_IPV6)
326bool ipv6_mod_enabled(void);
327
328static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
329{
330 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
331}
332
333static inline struct raw6_sock *raw6_sk(const struct sock *sk)
334{
335 return (struct raw6_sock *)sk;
336}
337
338static inline void inet_sk_copy_descendant(struct sock *sk_to,
339 const struct sock *sk_from)
340{
341 int ancestor_size = sizeof(struct inet_sock);
342
343 if (sk_from->sk_family == PF_INET6)
344 ancestor_size += sizeof(struct ipv6_pinfo);
345
346 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
347}
348
349#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
350#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
351#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
352 inet6_sk(sk)->rxopt.bits.rxinfo)
353
354static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
355{
356 if (sk->sk_family == AF_INET6)
357 return &sk->sk_v6_rcv_saddr;
358 return NULL;
359}
360
361static inline int inet_v6_ipv6only(const struct sock *sk)
362{
363 /* ipv6only field is at same position for timewait and other sockets */
364 return ipv6_only_sock(sk);
365}
366#else
367#define __ipv6_only_sock(sk) 0
368#define ipv6_only_sock(sk) 0
369#define ipv6_sk_rxinfo(sk) 0
370
371static inline bool ipv6_mod_enabled(void)
372{
373 return false;
374}
375
376static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
377{
378 return NULL;
379}
380
381static inline struct inet6_request_sock *
382 inet6_rsk(const struct request_sock *rsk)
383{
384 return NULL;
385}
386
387static inline struct raw6_sock *raw6_sk(const struct sock *sk)
388{
389 return NULL;
390}
391
392#define inet6_rcv_saddr(__sk) NULL
393#define tcp_twsk_ipv6only(__sk) 0
394#define inet_v6_ipv6only(__sk) 0
395#endif /* IS_ENABLED(CONFIG_IPV6) */
396#endif /* _IPV6_H */
397