Linux kernel mirror (for testing)
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linux
1#ifndef _IPV6_H
2#define _IPV6_H
3
4#include <uapi/linux/ipv6.h>
5
6#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
7#define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
8/*
9 * This structure contains configuration options per IPv6 link.
10 */
11struct ipv6_devconf {
12 __s32 forwarding;
13 __s32 hop_limit;
14 __s32 mtu6;
15 __s32 accept_ra;
16 __s32 accept_redirects;
17 __s32 autoconf;
18 __s32 dad_transmits;
19 __s32 rtr_solicits;
20 __s32 rtr_solicit_interval;
21 __s32 rtr_solicit_max_interval;
22 __s32 rtr_solicit_delay;
23 __s32 force_mld_version;
24 __s32 mldv1_unsolicited_report_interval;
25 __s32 mldv2_unsolicited_report_interval;
26 __s32 use_tempaddr;
27 __s32 temp_valid_lft;
28 __s32 temp_prefered_lft;
29 __s32 regen_max_retry;
30 __s32 max_desync_factor;
31 __s32 max_addresses;
32 __s32 accept_ra_defrtr;
33 __s32 accept_ra_min_hop_limit;
34 __s32 accept_ra_pinfo;
35 __s32 ignore_routes_with_linkdown;
36#ifdef CONFIG_IPV6_ROUTER_PREF
37 __s32 accept_ra_rtr_pref;
38 __s32 rtr_probe_interval;
39#ifdef CONFIG_IPV6_ROUTE_INFO
40 __s32 accept_ra_rt_info_min_plen;
41 __s32 accept_ra_rt_info_max_plen;
42#endif
43#endif
44 __s32 proxy_ndp;
45 __s32 accept_source_route;
46 __s32 accept_ra_from_local;
47#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
48 __s32 optimistic_dad;
49 __s32 use_optimistic;
50#endif
51#ifdef CONFIG_IPV6_MROUTE
52 __s32 mc_forwarding;
53#endif
54 __s32 disable_ipv6;
55 __s32 drop_unicast_in_l2_multicast;
56 __s32 accept_dad;
57 __s32 force_tllao;
58 __s32 ndisc_notify;
59 __s32 suppress_frag_ndisc;
60 __s32 accept_ra_mtu;
61 __s32 drop_unsolicited_na;
62 struct ipv6_stable_secret {
63 bool initialized;
64 struct in6_addr secret;
65 } stable_secret;
66 __s32 use_oif_addrs_only;
67 __s32 keep_addr_on_down;
68 __s32 seg6_enabled;
69#ifdef CONFIG_IPV6_SEG6_HMAC
70 __s32 seg6_require_hmac;
71#endif
72 __u32 enhanced_dad;
73 __u32 addr_gen_mode;
74 __s32 disable_policy;
75
76 struct ctl_table_header *sysctl_header;
77};
78
79struct ipv6_params {
80 __s32 disable_ipv6;
81 __s32 autoconf;
82};
83extern struct ipv6_params ipv6_defaults;
84#include <linux/icmpv6.h>
85#include <linux/tcp.h>
86#include <linux/udp.h>
87
88#include <net/inet_sock.h>
89
90static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
91{
92 return (struct ipv6hdr *)skb_network_header(skb);
93}
94
95static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
96{
97 return (struct ipv6hdr *)skb_inner_network_header(skb);
98}
99
100static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
101{
102 return (struct ipv6hdr *)skb_transport_header(skb);
103}
104
105/*
106 This structure contains results of exthdrs parsing
107 as offsets from skb->nh.
108 */
109
110struct inet6_skb_parm {
111 int iif;
112 __be16 ra;
113 __u16 dst0;
114 __u16 srcrt;
115 __u16 dst1;
116 __u16 lastopt;
117 __u16 nhoff;
118 __u16 flags;
119#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
120 __u16 dsthao;
121#endif
122 __u16 frag_max_size;
123
124#define IP6SKB_XFRM_TRANSFORMED 1
125#define IP6SKB_FORWARDED 2
126#define IP6SKB_REROUTED 4
127#define IP6SKB_ROUTERALERT 8
128#define IP6SKB_FRAGMENTED 16
129#define IP6SKB_HOPBYHOP 32
130#define IP6SKB_L3SLAVE 64
131};
132
133#if defined(CONFIG_NET_L3_MASTER_DEV)
134static inline bool ipv6_l3mdev_skb(__u16 flags)
135{
136 return flags & IP6SKB_L3SLAVE;
137}
138#else
139static inline bool ipv6_l3mdev_skb(__u16 flags)
140{
141 return false;
142}
143#endif
144
145#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
146#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
147
148static inline int inet6_iif(const struct sk_buff *skb)
149{
150 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
151
152 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
153}
154
155/* can not be used in TCP layer after tcp_v6_fill_cb */
156static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
157{
158#if defined(CONFIG_NET_L3_MASTER_DEV)
159 if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
160 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
161 return true;
162#endif
163 return false;
164}
165
166struct tcp6_request_sock {
167 struct tcp_request_sock tcp6rsk_tcp;
168};
169
170struct ipv6_mc_socklist;
171struct ipv6_ac_socklist;
172struct ipv6_fl_socklist;
173
174struct inet6_cork {
175 struct ipv6_txoptions *opt;
176 u8 hop_limit;
177 u8 tclass;
178};
179
180/**
181 * struct ipv6_pinfo - ipv6 private area
182 *
183 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
184 * this _must_ be the last member, so that inet6_sk_generic
185 * is able to calculate its offset from the base struct sock
186 * by using the struct proto->slab_obj_size member. -acme
187 */
188struct ipv6_pinfo {
189 struct in6_addr saddr;
190 struct in6_pktinfo sticky_pktinfo;
191 const struct in6_addr *daddr_cache;
192#ifdef CONFIG_IPV6_SUBTREES
193 const struct in6_addr *saddr_cache;
194#endif
195
196 __be32 flow_label;
197 __u32 frag_size;
198
199 /*
200 * Packed in 16bits.
201 * Omit one shift by by putting the signed field at MSB.
202 */
203#if defined(__BIG_ENDIAN_BITFIELD)
204 __s16 hop_limit:9;
205 __u16 __unused_1:7;
206#else
207 __u16 __unused_1:7;
208 __s16 hop_limit:9;
209#endif
210
211#if defined(__BIG_ENDIAN_BITFIELD)
212 /* Packed in 16bits. */
213 __s16 mcast_hops:9;
214 __u16 __unused_2:6,
215 mc_loop:1;
216#else
217 __u16 mc_loop:1,
218 __unused_2:6;
219 __s16 mcast_hops:9;
220#endif
221 int ucast_oif;
222 int mcast_oif;
223
224 /* pktoption flags */
225 union {
226 struct {
227 __u16 srcrt:1,
228 osrcrt:1,
229 rxinfo:1,
230 rxoinfo:1,
231 rxhlim:1,
232 rxohlim:1,
233 hopopts:1,
234 ohopopts:1,
235 dstopts:1,
236 odstopts:1,
237 rxflow:1,
238 rxtclass:1,
239 rxpmtu:1,
240 rxorigdstaddr:1,
241 recvfragsize:1;
242 /* 1 bits hole */
243 } bits;
244 __u16 all;
245 } rxopt;
246
247 /* sockopt flags */
248 __u16 recverr:1,
249 sndflow:1,
250 repflow:1,
251 pmtudisc:3,
252 padding:1, /* 1 bit hole */
253 srcprefs:3, /* 001: prefer temporary address
254 * 010: prefer public address
255 * 100: prefer care-of address
256 */
257 dontfrag:1,
258 autoflowlabel:1;
259 __u8 min_hopcount;
260 __u8 tclass;
261 __be32 rcv_flowinfo;
262
263 __u32 dst_cookie;
264 __u32 rx_dst_cookie;
265
266 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
267 struct ipv6_ac_socklist *ipv6_ac_list;
268 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
269
270 struct ipv6_txoptions __rcu *opt;
271 struct sk_buff *pktoptions;
272 struct sk_buff *rxpmtu;
273 struct inet6_cork cork;
274};
275
276/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
277struct raw6_sock {
278 /* inet_sock has to be the first member of raw6_sock */
279 struct inet_sock inet;
280 __u32 checksum; /* perform checksum */
281 __u32 offset; /* checksum offset */
282 struct icmp6_filter filter;
283 __u32 ip6mr_table;
284 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
285 struct ipv6_pinfo inet6;
286};
287
288struct udp6_sock {
289 struct udp_sock udp;
290 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
291 struct ipv6_pinfo inet6;
292};
293
294struct tcp6_sock {
295 struct tcp_sock tcp;
296 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
297 struct ipv6_pinfo inet6;
298};
299
300extern int inet6_sk_rebuild_header(struct sock *sk);
301
302struct tcp6_timewait_sock {
303 struct tcp_timewait_sock tcp6tw_tcp;
304};
305
306#if IS_ENABLED(CONFIG_IPV6)
307bool ipv6_mod_enabled(void);
308
309static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
310{
311 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
312}
313
314static inline struct raw6_sock *raw6_sk(const struct sock *sk)
315{
316 return (struct raw6_sock *)sk;
317}
318
319static inline void inet_sk_copy_descendant(struct sock *sk_to,
320 const struct sock *sk_from)
321{
322 int ancestor_size = sizeof(struct inet_sock);
323
324 if (sk_from->sk_family == PF_INET6)
325 ancestor_size += sizeof(struct ipv6_pinfo);
326
327 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
328}
329
330#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
331#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
332#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
333 inet6_sk(sk)->rxopt.bits.rxinfo)
334
335static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
336{
337 if (sk->sk_family == AF_INET6)
338 return &sk->sk_v6_rcv_saddr;
339 return NULL;
340}
341
342static inline int inet_v6_ipv6only(const struct sock *sk)
343{
344 /* ipv6only field is at same position for timewait and other sockets */
345 return ipv6_only_sock(sk);
346}
347#else
348#define __ipv6_only_sock(sk) 0
349#define ipv6_only_sock(sk) 0
350#define ipv6_sk_rxinfo(sk) 0
351
352static inline bool ipv6_mod_enabled(void)
353{
354 return false;
355}
356
357static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
358{
359 return NULL;
360}
361
362static inline struct inet6_request_sock *
363 inet6_rsk(const struct request_sock *rsk)
364{
365 return NULL;
366}
367
368static inline struct raw6_sock *raw6_sk(const struct sock *sk)
369{
370 return NULL;
371}
372
373#define inet6_rcv_saddr(__sk) NULL
374#define tcp_twsk_ipv6only(__sk) 0
375#define inet_v6_ipv6only(__sk) 0
376#endif /* IS_ENABLED(CONFIG_IPV6) */
377#endif /* _IPV6_H */