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 __s32 ndisc_tclass;
77 __s32 rpl_seg_enabled;
78
79 struct ctl_table_header *sysctl_header;
80};
81
82struct ipv6_params {
83 __s32 disable_ipv6;
84 __s32 autoconf;
85};
86extern struct ipv6_params ipv6_defaults;
87#include <linux/icmpv6.h>
88#include <linux/tcp.h>
89#include <linux/udp.h>
90
91#include <net/inet_sock.h>
92
93static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
94{
95 return (struct ipv6hdr *)skb_network_header(skb);
96}
97
98static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
99{
100 return (struct ipv6hdr *)skb_inner_network_header(skb);
101}
102
103static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
104{
105 return (struct ipv6hdr *)skb_transport_header(skb);
106}
107
108static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
109{
110 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
111 skb_network_header_len(skb);
112}
113
114/*
115 This structure contains results of exthdrs parsing
116 as offsets from skb->nh.
117 */
118
119struct inet6_skb_parm {
120 int iif;
121 __be16 ra;
122 __u16 dst0;
123 __u16 srcrt;
124 __u16 dst1;
125 __u16 lastopt;
126 __u16 nhoff;
127 __u16 flags;
128#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
129 __u16 dsthao;
130#endif
131 __u16 frag_max_size;
132
133#define IP6SKB_XFRM_TRANSFORMED 1
134#define IP6SKB_FORWARDED 2
135#define IP6SKB_REROUTED 4
136#define IP6SKB_ROUTERALERT 8
137#define IP6SKB_FRAGMENTED 16
138#define IP6SKB_HOPBYHOP 32
139#define IP6SKB_L3SLAVE 64
140#define IP6SKB_JUMBOGRAM 128
141};
142
143#if defined(CONFIG_NET_L3_MASTER_DEV)
144static inline bool ipv6_l3mdev_skb(__u16 flags)
145{
146 return flags & IP6SKB_L3SLAVE;
147}
148#else
149static inline bool ipv6_l3mdev_skb(__u16 flags)
150{
151 return false;
152}
153#endif
154
155#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
156#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
157
158static inline int inet6_iif(const struct sk_buff *skb)
159{
160 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
161
162 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
163}
164
165static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
166{
167 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
168}
169
170/* can not be used in TCP layer after tcp_v6_fill_cb */
171static inline int inet6_sdif(const struct sk_buff *skb)
172{
173#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
174 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
175 return IP6CB(skb)->iif;
176#endif
177 return 0;
178}
179
180struct tcp6_request_sock {
181 struct tcp_request_sock tcp6rsk_tcp;
182};
183
184struct ipv6_mc_socklist;
185struct ipv6_ac_socklist;
186struct ipv6_fl_socklist;
187
188struct inet6_cork {
189 struct ipv6_txoptions *opt;
190 u8 hop_limit;
191 u8 tclass;
192};
193
194/**
195 * struct ipv6_pinfo - ipv6 private area
196 *
197 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
198 * this _must_ be the last member, so that inet6_sk_generic
199 * is able to calculate its offset from the base struct sock
200 * by using the struct proto->slab_obj_size member. -acme
201 */
202struct ipv6_pinfo {
203 struct in6_addr saddr;
204 struct in6_pktinfo sticky_pktinfo;
205 const struct in6_addr *daddr_cache;
206#ifdef CONFIG_IPV6_SUBTREES
207 const struct in6_addr *saddr_cache;
208#endif
209
210 __be32 flow_label;
211 __u32 frag_size;
212
213 /*
214 * Packed in 16bits.
215 * Omit one shift by putting the signed field at MSB.
216 */
217#if defined(__BIG_ENDIAN_BITFIELD)
218 __s16 hop_limit:9;
219 __u16 __unused_1:7;
220#else
221 __u16 __unused_1:7;
222 __s16 hop_limit:9;
223#endif
224
225#if defined(__BIG_ENDIAN_BITFIELD)
226 /* Packed in 16bits. */
227 __s16 mcast_hops:9;
228 __u16 __unused_2:6,
229 mc_loop:1;
230#else
231 __u16 mc_loop:1,
232 __unused_2:6;
233 __s16 mcast_hops:9;
234#endif
235 int ucast_oif;
236 int mcast_oif;
237
238 /* pktoption flags */
239 union {
240 struct {
241 __u16 srcrt:1,
242 osrcrt:1,
243 rxinfo:1,
244 rxoinfo:1,
245 rxhlim:1,
246 rxohlim:1,
247 hopopts:1,
248 ohopopts:1,
249 dstopts:1,
250 odstopts:1,
251 rxflow:1,
252 rxtclass:1,
253 rxpmtu:1,
254 rxorigdstaddr:1,
255 recvfragsize:1;
256 /* 1 bits hole */
257 } bits;
258 __u16 all;
259 } rxopt;
260
261 /* sockopt flags */
262 __u16 recverr:1,
263 sndflow:1,
264 repflow:1,
265 pmtudisc:3,
266 padding:1, /* 1 bit hole */
267 srcprefs:3, /* 001: prefer temporary address
268 * 010: prefer public address
269 * 100: prefer care-of address
270 */
271 dontfrag:1,
272 autoflowlabel:1,
273 autoflowlabel_set:1,
274 mc_all:1,
275 recverr_rfc4884:1,
276 rtalert_isolate:1;
277 __u8 min_hopcount;
278 __u8 tclass;
279 __be32 rcv_flowinfo;
280
281 __u32 dst_cookie;
282 __u32 rx_dst_cookie;
283
284 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
285 struct ipv6_ac_socklist *ipv6_ac_list;
286 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
287
288 struct ipv6_txoptions __rcu *opt;
289 struct sk_buff *pktoptions;
290 struct sk_buff *rxpmtu;
291 struct inet6_cork cork;
292};
293
294/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
295struct raw6_sock {
296 /* inet_sock has to be the first member of raw6_sock */
297 struct inet_sock inet;
298 __u32 checksum; /* perform checksum */
299 __u32 offset; /* checksum offset */
300 struct icmp6_filter filter;
301 __u32 ip6mr_table;
302 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
303 struct ipv6_pinfo inet6;
304};
305
306struct udp6_sock {
307 struct udp_sock udp;
308 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
309 struct ipv6_pinfo inet6;
310};
311
312struct tcp6_sock {
313 struct tcp_sock tcp;
314 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
315 struct ipv6_pinfo inet6;
316};
317
318extern int inet6_sk_rebuild_header(struct sock *sk);
319
320struct tcp6_timewait_sock {
321 struct tcp_timewait_sock tcp6tw_tcp;
322};
323
324#if IS_ENABLED(CONFIG_IPV6)
325bool ipv6_mod_enabled(void);
326
327static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
328{
329 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
330}
331
332static inline struct raw6_sock *raw6_sk(const struct sock *sk)
333{
334 return (struct raw6_sock *)sk;
335}
336
337#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
338#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
339#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
340 inet6_sk(sk)->rxopt.bits.rxinfo)
341
342static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
343{
344 if (sk->sk_family == AF_INET6)
345 return &sk->sk_v6_rcv_saddr;
346 return NULL;
347}
348
349static inline int inet_v6_ipv6only(const struct sock *sk)
350{
351 /* ipv6only field is at same position for timewait and other sockets */
352 return ipv6_only_sock(sk);
353}
354#else
355#define __ipv6_only_sock(sk) 0
356#define ipv6_only_sock(sk) 0
357#define ipv6_sk_rxinfo(sk) 0
358
359static inline bool ipv6_mod_enabled(void)
360{
361 return false;
362}
363
364static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
365{
366 return NULL;
367}
368
369static inline struct inet6_request_sock *
370 inet6_rsk(const struct request_sock *rsk)
371{
372 return NULL;
373}
374
375static inline struct raw6_sock *raw6_sk(const struct sock *sk)
376{
377 return NULL;
378}
379
380#define inet6_rcv_saddr(__sk) NULL
381#define tcp_twsk_ipv6only(__sk) 0
382#define inet_v6_ipv6only(__sk) 0
383#endif /* IS_ENABLED(CONFIG_IPV6) */
384#endif /* _IPV6_H */