Linux kernel mirror (for testing)
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linux
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 __s32 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 struct ipv6_stable_secret {
65 bool initialized;
66 struct in6_addr secret;
67 } stable_secret;
68 __s32 use_oif_addrs_only;
69 __s32 keep_addr_on_down;
70 __s32 seg6_enabled;
71#ifdef CONFIG_IPV6_SEG6_HMAC
72 __s32 seg6_require_hmac;
73#endif
74 __u32 enhanced_dad;
75 __u32 addr_gen_mode;
76 __s32 disable_policy;
77 __s32 ndisc_tclass;
78 __s32 rpl_seg_enabled;
79 __u32 ioam6_id;
80 __u32 ioam6_id_wide;
81 __u8 ioam6_enabled;
82 __u8 ndisc_evict_nocarrier;
83
84 struct ctl_table_header *sysctl_header;
85};
86
87struct ipv6_params {
88 __s32 disable_ipv6;
89 __s32 autoconf;
90};
91extern struct ipv6_params ipv6_defaults;
92#include <linux/tcp.h>
93#include <linux/udp.h>
94
95#include <net/inet_sock.h>
96
97static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
98{
99 return (struct ipv6hdr *)skb_network_header(skb);
100}
101
102static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
103{
104 return (struct ipv6hdr *)skb_inner_network_header(skb);
105}
106
107static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
108{
109 return (struct ipv6hdr *)skb_transport_header(skb);
110}
111
112static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
113{
114 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
115 skb_network_header_len(skb);
116}
117
118/*
119 This structure contains results of exthdrs parsing
120 as offsets from skb->nh.
121 */
122
123struct inet6_skb_parm {
124 int iif;
125 __be16 ra;
126 __u16 dst0;
127 __u16 srcrt;
128 __u16 dst1;
129 __u16 lastopt;
130 __u16 nhoff;
131 __u16 flags;
132#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
133 __u16 dsthao;
134#endif
135 __u16 frag_max_size;
136
137#define IP6SKB_XFRM_TRANSFORMED 1
138#define IP6SKB_FORWARDED 2
139#define IP6SKB_REROUTED 4
140#define IP6SKB_ROUTERALERT 8
141#define IP6SKB_FRAGMENTED 16
142#define IP6SKB_HOPBYHOP 32
143#define IP6SKB_L3SLAVE 64
144#define IP6SKB_JUMBOGRAM 128
145};
146
147#if defined(CONFIG_NET_L3_MASTER_DEV)
148static inline bool ipv6_l3mdev_skb(__u16 flags)
149{
150 return flags & IP6SKB_L3SLAVE;
151}
152#else
153static inline bool ipv6_l3mdev_skb(__u16 flags)
154{
155 return false;
156}
157#endif
158
159#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
160#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
161
162static inline int inet6_iif(const struct sk_buff *skb)
163{
164 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
165
166 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
167}
168
169static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
170{
171 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
172}
173
174/* can not be used in TCP layer after tcp_v6_fill_cb */
175static inline int inet6_sdif(const struct sk_buff *skb)
176{
177#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
178 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
179 return IP6CB(skb)->iif;
180#endif
181 return 0;
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 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 mc_all:1,
279 recverr_rfc4884:1,
280 rtalert_isolate:1;
281 __u8 min_hopcount;
282 __u8 tclass;
283 __be32 rcv_flowinfo;
284
285 __u32 dst_cookie;
286
287 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
288 struct ipv6_ac_socklist *ipv6_ac_list;
289 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
290
291 struct ipv6_txoptions __rcu *opt;
292 struct sk_buff *pktoptions;
293 struct sk_buff *rxpmtu;
294 struct inet6_cork cork;
295};
296
297/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
298struct raw6_sock {
299 /* inet_sock has to be the first member of raw6_sock */
300 struct inet_sock inet;
301 __u32 checksum; /* perform checksum */
302 __u32 offset; /* checksum offset */
303 struct icmp6_filter filter;
304 __u32 ip6mr_table;
305 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
306 struct ipv6_pinfo inet6;
307};
308
309struct udp6_sock {
310 struct udp_sock udp;
311 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
312 struct ipv6_pinfo inet6;
313};
314
315struct tcp6_sock {
316 struct tcp_sock tcp;
317 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
318 struct ipv6_pinfo inet6;
319};
320
321extern int inet6_sk_rebuild_header(struct sock *sk);
322
323struct tcp6_timewait_sock {
324 struct tcp_timewait_sock tcp6tw_tcp;
325};
326
327#if IS_ENABLED(CONFIG_IPV6)
328bool ipv6_mod_enabled(void);
329
330static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
331{
332 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
333}
334
335static inline struct raw6_sock *raw6_sk(const struct sock *sk)
336{
337 return (struct raw6_sock *)sk;
338}
339
340#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
341#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
342#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
343 inet6_sk(sk)->rxopt.bits.rxinfo)
344
345static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
346{
347 if (sk->sk_family == AF_INET6)
348 return &sk->sk_v6_rcv_saddr;
349 return NULL;
350}
351
352static inline int inet_v6_ipv6only(const struct sock *sk)
353{
354 /* ipv6only field is at same position for timewait and other sockets */
355 return ipv6_only_sock(sk);
356}
357#else
358#define __ipv6_only_sock(sk) 0
359#define ipv6_only_sock(sk) 0
360#define ipv6_sk_rxinfo(sk) 0
361
362static inline bool ipv6_mod_enabled(void)
363{
364 return false;
365}
366
367static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
368{
369 return NULL;
370}
371
372static inline struct inet6_request_sock *
373 inet6_rsk(const struct request_sock *rsk)
374{
375 return NULL;
376}
377
378static inline struct raw6_sock *raw6_sk(const struct sock *sk)
379{
380 return NULL;
381}
382
383#define inet6_rcv_saddr(__sk) NULL
384#define tcp_twsk_ipv6only(__sk) 0
385#define inet_v6_ipv6only(__sk) 0
386#endif /* IS_ENABLED(CONFIG_IPV6) */
387#endif /* _IPV6_H */