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