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
107static 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
118struct 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)
143static inline bool ipv6_l3mdev_skb(__u16 flags)
144{
145 return flags & IP6SKB_L3SLAVE;
146}
147#else
148static 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
157static 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
164static 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 */
170static 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/* can not be used in TCP layer after tcp_v6_fill_cb */
180static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
181{
182#if defined(CONFIG_NET_L3_MASTER_DEV)
183 if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
184 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
185 return true;
186#endif
187 return false;
188}
189
190struct tcp6_request_sock {
191 struct tcp_request_sock tcp6rsk_tcp;
192};
193
194struct ipv6_mc_socklist;
195struct ipv6_ac_socklist;
196struct ipv6_fl_socklist;
197
198struct inet6_cork {
199 struct ipv6_txoptions *opt;
200 u8 hop_limit;
201 u8 tclass;
202};
203
204/**
205 * struct ipv6_pinfo - ipv6 private area
206 *
207 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
208 * this _must_ be the last member, so that inet6_sk_generic
209 * is able to calculate its offset from the base struct sock
210 * by using the struct proto->slab_obj_size member. -acme
211 */
212struct ipv6_pinfo {
213 struct in6_addr saddr;
214 struct in6_pktinfo sticky_pktinfo;
215 const struct in6_addr *daddr_cache;
216#ifdef CONFIG_IPV6_SUBTREES
217 const struct in6_addr *saddr_cache;
218#endif
219
220 __be32 flow_label;
221 __u32 frag_size;
222
223 /*
224 * Packed in 16bits.
225 * Omit one shift by by putting the signed field at MSB.
226 */
227#if defined(__BIG_ENDIAN_BITFIELD)
228 __s16 hop_limit:9;
229 __u16 __unused_1:7;
230#else
231 __u16 __unused_1:7;
232 __s16 hop_limit:9;
233#endif
234
235#if defined(__BIG_ENDIAN_BITFIELD)
236 /* Packed in 16bits. */
237 __s16 mcast_hops:9;
238 __u16 __unused_2:6,
239 mc_loop:1;
240#else
241 __u16 mc_loop:1,
242 __unused_2:6;
243 __s16 mcast_hops:9;
244#endif
245 int ucast_oif;
246 int mcast_oif;
247
248 /* pktoption flags */
249 union {
250 struct {
251 __u16 srcrt:1,
252 osrcrt:1,
253 rxinfo:1,
254 rxoinfo:1,
255 rxhlim:1,
256 rxohlim:1,
257 hopopts:1,
258 ohopopts:1,
259 dstopts:1,
260 odstopts:1,
261 rxflow:1,
262 rxtclass:1,
263 rxpmtu:1,
264 rxorigdstaddr:1,
265 recvfragsize:1;
266 /* 1 bits hole */
267 } bits;
268 __u16 all;
269 } rxopt;
270
271 /* sockopt flags */
272 __u16 recverr:1,
273 sndflow:1,
274 repflow:1,
275 pmtudisc:3,
276 padding:1, /* 1 bit hole */
277 srcprefs:3, /* 001: prefer temporary address
278 * 010: prefer public address
279 * 100: prefer care-of address
280 */
281 dontfrag:1,
282 autoflowlabel:1,
283 autoflowlabel_set:1,
284 mc_all:1,
285 rtalert_isolate:1;
286 __u8 min_hopcount;
287 __u8 tclass;
288 __be32 rcv_flowinfo;
289
290 __u32 dst_cookie;
291 __u32 rx_dst_cookie;
292
293 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
294 struct ipv6_ac_socklist *ipv6_ac_list;
295 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
296
297 struct ipv6_txoptions __rcu *opt;
298 struct sk_buff *pktoptions;
299 struct sk_buff *rxpmtu;
300 struct inet6_cork cork;
301};
302
303/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
304struct raw6_sock {
305 /* inet_sock has to be the first member of raw6_sock */
306 struct inet_sock inet;
307 __u32 checksum; /* perform checksum */
308 __u32 offset; /* checksum offset */
309 struct icmp6_filter filter;
310 __u32 ip6mr_table;
311 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
312 struct ipv6_pinfo inet6;
313};
314
315struct udp6_sock {
316 struct udp_sock udp;
317 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
318 struct ipv6_pinfo inet6;
319};
320
321struct tcp6_sock {
322 struct tcp_sock tcp;
323 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
324 struct ipv6_pinfo inet6;
325};
326
327extern int inet6_sk_rebuild_header(struct sock *sk);
328
329struct tcp6_timewait_sock {
330 struct tcp_timewait_sock tcp6tw_tcp;
331};
332
333#if IS_ENABLED(CONFIG_IPV6)
334bool ipv6_mod_enabled(void);
335
336static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
337{
338 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
339}
340
341static inline struct raw6_sock *raw6_sk(const struct sock *sk)
342{
343 return (struct raw6_sock *)sk;
344}
345
346static inline void inet_sk_copy_descendant(struct sock *sk_to,
347 const struct sock *sk_from)
348{
349 int ancestor_size = sizeof(struct inet_sock);
350
351 if (sk_from->sk_family == PF_INET6)
352 ancestor_size += sizeof(struct ipv6_pinfo);
353
354 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
355}
356
357#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
358#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
359#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
360 inet6_sk(sk)->rxopt.bits.rxinfo)
361
362static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
363{
364 if (sk->sk_family == AF_INET6)
365 return &sk->sk_v6_rcv_saddr;
366 return NULL;
367}
368
369static inline int inet_v6_ipv6only(const struct sock *sk)
370{
371 /* ipv6only field is at same position for timewait and other sockets */
372 return ipv6_only_sock(sk);
373}
374#else
375#define __ipv6_only_sock(sk) 0
376#define ipv6_only_sock(sk) 0
377#define ipv6_sk_rxinfo(sk) 0
378
379static inline bool ipv6_mod_enabled(void)
380{
381 return false;
382}
383
384static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
385{
386 return NULL;
387}
388
389static inline struct inet6_request_sock *
390 inet6_rsk(const struct request_sock *rsk)
391{
392 return NULL;
393}
394
395static inline struct raw6_sock *raw6_sk(const struct sock *sk)
396{
397 return NULL;
398}
399
400#define inet6_rcv_saddr(__sk) NULL
401#define tcp_twsk_ipv6only(__sk) 0
402#define inet_v6_ipv6only(__sk) 0
403#endif /* IS_ENABLED(CONFIG_IPV6) */
404#endif /* _IPV6_H */
405