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 __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
77 struct ctl_table_header *sysctl_header;
78};
79
80struct ipv6_params {
81 __s32 disable_ipv6;
82 __s32 autoconf;
83};
84extern struct ipv6_params ipv6_defaults;
85#include <linux/icmpv6.h>
86#include <linux/tcp.h>
87#include <linux/udp.h>
88
89#include <net/inet_sock.h>
90
91static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
92{
93 return (struct ipv6hdr *)skb_network_header(skb);
94}
95
96static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
97{
98 return (struct ipv6hdr *)skb_inner_network_header(skb);
99}
100
101static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
102{
103 return (struct ipv6hdr *)skb_transport_header(skb);
104}
105
106/*
107 This structure contains results of exthdrs parsing
108 as offsets from skb->nh.
109 */
110
111struct inet6_skb_parm {
112 int iif;
113 __be16 ra;
114 __u16 dst0;
115 __u16 srcrt;
116 __u16 dst1;
117 __u16 lastopt;
118 __u16 nhoff;
119 __u16 flags;
120#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
121 __u16 dsthao;
122#endif
123 __u16 frag_max_size;
124
125#define IP6SKB_XFRM_TRANSFORMED 1
126#define IP6SKB_FORWARDED 2
127#define IP6SKB_REROUTED 4
128#define IP6SKB_ROUTERALERT 8
129#define IP6SKB_FRAGMENTED 16
130#define IP6SKB_HOPBYHOP 32
131#define IP6SKB_L3SLAVE 64
132#define IP6SKB_JUMBOGRAM 128
133};
134
135#if defined(CONFIG_NET_L3_MASTER_DEV)
136static inline bool ipv6_l3mdev_skb(__u16 flags)
137{
138 return flags & IP6SKB_L3SLAVE;
139}
140#else
141static inline bool ipv6_l3mdev_skb(__u16 flags)
142{
143 return false;
144}
145#endif
146
147#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
148#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
149
150static inline int inet6_iif(const struct sk_buff *skb)
151{
152 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
153
154 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
155}
156
157static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
158{
159 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
160}
161
162/* can not be used in TCP layer after tcp_v6_fill_cb */
163static inline int inet6_sdif(const struct sk_buff *skb)
164{
165#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
166 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
167 return IP6CB(skb)->iif;
168#endif
169 return 0;
170}
171
172/* can not be used in TCP layer after tcp_v6_fill_cb */
173static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
174{
175#if defined(CONFIG_NET_L3_MASTER_DEV)
176 if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
177 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
178 return true;
179#endif
180 return false;
181}
182
183struct tcp6_request_sock {
184 struct tcp_request_sock tcp6rsk_tcp;
185};
186
187struct ipv6_mc_socklist;
188struct ipv6_ac_socklist;
189struct ipv6_fl_socklist;
190
191struct inet6_cork {
192 struct ipv6_txoptions *opt;
193 u8 hop_limit;
194 u8 tclass;
195};
196
197/**
198 * struct ipv6_pinfo - ipv6 private area
199 *
200 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
201 * this _must_ be the last member, so that inet6_sk_generic
202 * is able to calculate its offset from the base struct sock
203 * by using the struct proto->slab_obj_size member. -acme
204 */
205struct ipv6_pinfo {
206 struct in6_addr saddr;
207 struct in6_pktinfo sticky_pktinfo;
208 const struct in6_addr *daddr_cache;
209#ifdef CONFIG_IPV6_SUBTREES
210 const struct in6_addr *saddr_cache;
211#endif
212
213 __be32 flow_label;
214 __u32 frag_size;
215
216 /*
217 * Packed in 16bits.
218 * Omit one shift by by putting the signed field at MSB.
219 */
220#if defined(__BIG_ENDIAN_BITFIELD)
221 __s16 hop_limit:9;
222 __u16 __unused_1:7;
223#else
224 __u16 __unused_1:7;
225 __s16 hop_limit:9;
226#endif
227
228#if defined(__BIG_ENDIAN_BITFIELD)
229 /* Packed in 16bits. */
230 __s16 mcast_hops:9;
231 __u16 __unused_2:6,
232 mc_loop:1;
233#else
234 __u16 mc_loop:1,
235 __unused_2:6;
236 __s16 mcast_hops:9;
237#endif
238 int ucast_oif;
239 int mcast_oif;
240
241 /* pktoption flags */
242 union {
243 struct {
244 __u16 srcrt:1,
245 osrcrt:1,
246 rxinfo:1,
247 rxoinfo:1,
248 rxhlim:1,
249 rxohlim:1,
250 hopopts:1,
251 ohopopts:1,
252 dstopts:1,
253 odstopts:1,
254 rxflow:1,
255 rxtclass:1,
256 rxpmtu:1,
257 rxorigdstaddr:1,
258 recvfragsize:1;
259 /* 1 bits hole */
260 } bits;
261 __u16 all;
262 } rxopt;
263
264 /* sockopt flags */
265 __u16 recverr:1,
266 sndflow:1,
267 repflow:1,
268 pmtudisc:3,
269 padding:1, /* 1 bit hole */
270 srcprefs:3, /* 001: prefer temporary address
271 * 010: prefer public address
272 * 100: prefer care-of address
273 */
274 dontfrag:1,
275 autoflowlabel:1;
276 __u8 min_hopcount;
277 __u8 tclass;
278 __be32 rcv_flowinfo;
279
280 __u32 dst_cookie;
281 __u32 rx_dst_cookie;
282
283 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
284 struct ipv6_ac_socklist *ipv6_ac_list;
285 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
286
287 struct ipv6_txoptions __rcu *opt;
288 struct sk_buff *pktoptions;
289 struct sk_buff *rxpmtu;
290 struct inet6_cork cork;
291};
292
293/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
294struct raw6_sock {
295 /* inet_sock has to be the first member of raw6_sock */
296 struct inet_sock inet;
297 __u32 checksum; /* perform checksum */
298 __u32 offset; /* checksum offset */
299 struct icmp6_filter filter;
300 __u32 ip6mr_table;
301 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
302 struct ipv6_pinfo inet6;
303};
304
305struct udp6_sock {
306 struct udp_sock udp;
307 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
308 struct ipv6_pinfo inet6;
309};
310
311struct tcp6_sock {
312 struct tcp_sock tcp;
313 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
314 struct ipv6_pinfo inet6;
315};
316
317extern int inet6_sk_rebuild_header(struct sock *sk);
318
319struct tcp6_timewait_sock {
320 struct tcp_timewait_sock tcp6tw_tcp;
321};
322
323#if IS_ENABLED(CONFIG_IPV6)
324bool ipv6_mod_enabled(void);
325
326static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
327{
328 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
329}
330
331static inline struct raw6_sock *raw6_sk(const struct sock *sk)
332{
333 return (struct raw6_sock *)sk;
334}
335
336static inline void inet_sk_copy_descendant(struct sock *sk_to,
337 const struct sock *sk_from)
338{
339 int ancestor_size = sizeof(struct inet_sock);
340
341 if (sk_from->sk_family == PF_INET6)
342 ancestor_size += sizeof(struct ipv6_pinfo);
343
344 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
345}
346
347#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
348#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
349#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
350 inet6_sk(sk)->rxopt.bits.rxinfo)
351
352static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
353{
354 if (sk->sk_family == AF_INET6)
355 return &sk->sk_v6_rcv_saddr;
356 return NULL;
357}
358
359static inline int inet_v6_ipv6only(const struct sock *sk)
360{
361 /* ipv6only field is at same position for timewait and other sockets */
362 return ipv6_only_sock(sk);
363}
364#else
365#define __ipv6_only_sock(sk) 0
366#define ipv6_only_sock(sk) 0
367#define ipv6_sk_rxinfo(sk) 0
368
369static inline bool ipv6_mod_enabled(void)
370{
371 return false;
372}
373
374static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
375{
376 return NULL;
377}
378
379static inline struct inet6_request_sock *
380 inet6_rsk(const struct request_sock *rsk)
381{
382 return NULL;
383}
384
385static inline struct raw6_sock *raw6_sk(const struct sock *sk)
386{
387 return NULL;
388}
389
390#define inet6_rcv_saddr(__sk) NULL
391#define tcp_twsk_ipv6only(__sk) 0
392#define inet_v6_ipv6only(__sk) 0
393#endif /* IS_ENABLED(CONFIG_IPV6) */
394#endif /* _IPV6_H */