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