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