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 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 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 __u16 srhoff;
137
138#define IP6SKB_XFRM_TRANSFORMED 1
139#define IP6SKB_FORWARDED 2
140#define IP6SKB_REROUTED 4
141#define IP6SKB_ROUTERALERT 8
142#define IP6SKB_FRAGMENTED 16
143#define IP6SKB_HOPBYHOP 32
144#define IP6SKB_L3SLAVE 64
145#define IP6SKB_JUMBOGRAM 128
146#define IP6SKB_SEG6 256
147};
148
149#if defined(CONFIG_NET_L3_MASTER_DEV)
150static inline bool ipv6_l3mdev_skb(__u16 flags)
151{
152 return flags & IP6SKB_L3SLAVE;
153}
154#else
155static inline bool ipv6_l3mdev_skb(__u16 flags)
156{
157 return false;
158}
159#endif
160
161#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
162#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
163
164static inline int inet6_iif(const struct sk_buff *skb)
165{
166 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
167
168 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
169}
170
171static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
172{
173 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
174}
175
176/* can not be used in TCP layer after tcp_v6_fill_cb */
177static inline int inet6_sdif(const struct sk_buff *skb)
178{
179#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
180 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
181 return IP6CB(skb)->iif;
182#endif
183 return 0;
184}
185
186struct tcp6_request_sock {
187 struct tcp_request_sock tcp6rsk_tcp;
188};
189
190struct ipv6_mc_socklist;
191struct ipv6_ac_socklist;
192struct ipv6_fl_socklist;
193
194struct inet6_cork {
195 struct ipv6_txoptions *opt;
196 u8 hop_limit;
197 u8 tclass;
198};
199
200/**
201 * struct ipv6_pinfo - ipv6 private area
202 *
203 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
204 * this _must_ be the last member, so that inet6_sk_generic
205 * is able to calculate its offset from the base struct sock
206 * by using the struct proto->slab_obj_size member. -acme
207 */
208struct ipv6_pinfo {
209 struct in6_addr saddr;
210 struct in6_pktinfo sticky_pktinfo;
211 const struct in6_addr *daddr_cache;
212#ifdef CONFIG_IPV6_SUBTREES
213 const struct in6_addr *saddr_cache;
214#endif
215
216 __be32 flow_label;
217 __u32 frag_size;
218
219 /*
220 * Packed in 16bits.
221 * Omit one shift by putting the signed field at MSB.
222 */
223#if defined(__BIG_ENDIAN_BITFIELD)
224 __s16 hop_limit:9;
225 __u16 __unused_1:7;
226#else
227 __u16 __unused_1:7;
228 __s16 hop_limit:9;
229#endif
230
231#if defined(__BIG_ENDIAN_BITFIELD)
232 /* Packed in 16bits. */
233 __s16 mcast_hops:9;
234 __u16 __unused_2:6,
235 mc_loop:1;
236#else
237 __u16 mc_loop:1,
238 __unused_2:6;
239 __s16 mcast_hops:9;
240#endif
241 int ucast_oif;
242 int mcast_oif;
243
244 /* pktoption flags */
245 union {
246 struct {
247 __u16 srcrt:1,
248 osrcrt:1,
249 rxinfo:1,
250 rxoinfo:1,
251 rxhlim:1,
252 rxohlim:1,
253 hopopts:1,
254 ohopopts:1,
255 dstopts:1,
256 odstopts:1,
257 rxflow:1,
258 rxtclass:1,
259 rxpmtu:1,
260 rxorigdstaddr:1,
261 recvfragsize:1;
262 /* 1 bits hole */
263 } bits;
264 __u16 all;
265 } rxopt;
266
267 /* sockopt flags */
268 __u16 recverr:1,
269 sndflow:1,
270 repflow:1,
271 pmtudisc:3,
272 padding:1, /* 1 bit hole */
273 srcprefs:3, /* 001: prefer temporary address
274 * 010: prefer public address
275 * 100: prefer care-of address
276 */
277 dontfrag:1,
278 autoflowlabel:1,
279 autoflowlabel_set:1,
280 mc_all:1,
281 recverr_rfc4884:1,
282 rtalert_isolate:1;
283 __u8 min_hopcount;
284 __u8 tclass;
285 __be32 rcv_flowinfo;
286
287 __u32 dst_cookie;
288
289 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
290 struct ipv6_ac_socklist *ipv6_ac_list;
291 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
292
293 struct ipv6_txoptions __rcu *opt;
294 struct sk_buff *pktoptions;
295 struct sk_buff *rxpmtu;
296 struct inet6_cork cork;
297};
298
299/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
300struct raw6_sock {
301 /* inet_sock has to be the first member of raw6_sock */
302 struct inet_sock inet;
303 __u32 checksum; /* perform checksum */
304 __u32 offset; /* checksum offset */
305 struct icmp6_filter filter;
306 __u32 ip6mr_table;
307 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
308 struct ipv6_pinfo inet6;
309};
310
311struct udp6_sock {
312 struct udp_sock udp;
313 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
314 struct ipv6_pinfo inet6;
315};
316
317struct tcp6_sock {
318 struct tcp_sock tcp;
319 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
320 struct ipv6_pinfo inet6;
321};
322
323extern int inet6_sk_rebuild_header(struct sock *sk);
324
325struct tcp6_timewait_sock {
326 struct tcp_timewait_sock tcp6tw_tcp;
327};
328
329#if IS_ENABLED(CONFIG_IPV6)
330bool ipv6_mod_enabled(void);
331
332static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
333{
334 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
335}
336
337static inline struct raw6_sock *raw6_sk(const struct sock *sk)
338{
339 return (struct raw6_sock *)sk;
340}
341
342#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
343#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
344#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
345 inet6_sk(sk)->rxopt.bits.rxinfo)
346
347static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
348{
349 if (sk->sk_family == AF_INET6)
350 return &sk->sk_v6_rcv_saddr;
351 return NULL;
352}
353
354static inline int inet_v6_ipv6only(const struct sock *sk)
355{
356 /* ipv6only field is at same position for timewait and other sockets */
357 return ipv6_only_sock(sk);
358}
359#else
360#define __ipv6_only_sock(sk) 0
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 */