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 __u32 ra_defrtr_metric;
35 __s32 accept_ra_min_hop_limit;
36 __s32 accept_ra_min_lft;
37 __s32 accept_ra_pinfo;
38 __s32 ignore_routes_with_linkdown;
39#ifdef CONFIG_IPV6_ROUTER_PREF
40 __s32 accept_ra_rtr_pref;
41 __s32 rtr_probe_interval;
42#ifdef CONFIG_IPV6_ROUTE_INFO
43 __s32 accept_ra_rt_info_min_plen;
44 __s32 accept_ra_rt_info_max_plen;
45#endif
46#endif
47 __s32 proxy_ndp;
48 __s32 accept_source_route;
49 __s32 accept_ra_from_local;
50#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
51 __s32 optimistic_dad;
52 __s32 use_optimistic;
53#endif
54#ifdef CONFIG_IPV6_MROUTE
55 atomic_t mc_forwarding;
56#endif
57 __s32 disable_ipv6;
58 __s32 drop_unicast_in_l2_multicast;
59 __s32 accept_dad;
60 __s32 force_tllao;
61 __s32 ndisc_notify;
62 __s32 suppress_frag_ndisc;
63 __s32 accept_ra_mtu;
64 __s32 drop_unsolicited_na;
65 __s32 accept_untracked_na;
66 struct ipv6_stable_secret {
67 bool initialized;
68 struct in6_addr secret;
69 } stable_secret;
70 __s32 use_oif_addrs_only;
71 __s32 keep_addr_on_down;
72 __s32 seg6_enabled;
73#ifdef CONFIG_IPV6_SEG6_HMAC
74 __s32 seg6_require_hmac;
75#endif
76 __u32 enhanced_dad;
77 __u32 addr_gen_mode;
78 __s32 disable_policy;
79 __s32 ndisc_tclass;
80 __s32 rpl_seg_enabled;
81 __u32 ioam6_id;
82 __u32 ioam6_id_wide;
83 __u8 ioam6_enabled;
84 __u8 ndisc_evict_nocarrier;
85
86 struct ctl_table_header *sysctl_header;
87};
88
89struct ipv6_params {
90 __s32 disable_ipv6;
91 __s32 autoconf;
92};
93extern struct ipv6_params ipv6_defaults;
94#include <linux/tcp.h>
95#include <linux/udp.h>
96
97#include <net/inet_sock.h>
98
99static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
100{
101 return (struct ipv6hdr *)skb_network_header(skb);
102}
103
104static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
105{
106 return (struct ipv6hdr *)skb_inner_network_header(skb);
107}
108
109static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
110{
111 return (struct ipv6hdr *)skb_transport_header(skb);
112}
113
114static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
115{
116 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
117 skb_network_header_len(skb);
118}
119
120/*
121 This structure contains results of exthdrs parsing
122 as offsets from skb->nh.
123 */
124
125struct inet6_skb_parm {
126 int iif;
127 __be16 ra;
128 __u16 dst0;
129 __u16 srcrt;
130 __u16 dst1;
131 __u16 lastopt;
132 __u16 nhoff;
133 __u16 flags;
134#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
135 __u16 dsthao;
136#endif
137 __u16 frag_max_size;
138 __u16 srhoff;
139
140#define IP6SKB_XFRM_TRANSFORMED 1
141#define IP6SKB_FORWARDED 2
142#define IP6SKB_REROUTED 4
143#define IP6SKB_ROUTERALERT 8
144#define IP6SKB_FRAGMENTED 16
145#define IP6SKB_HOPBYHOP 32
146#define IP6SKB_L3SLAVE 64
147#define IP6SKB_JUMBOGRAM 128
148#define IP6SKB_SEG6 256
149#define IP6SKB_FAKEJUMBO 512
150#define IP6SKB_MULTIPATH 1024
151};
152
153#if defined(CONFIG_NET_L3_MASTER_DEV)
154static inline bool ipv6_l3mdev_skb(__u16 flags)
155{
156 return flags & IP6SKB_L3SLAVE;
157}
158#else
159static inline bool ipv6_l3mdev_skb(__u16 flags)
160{
161 return false;
162}
163#endif
164
165#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
166#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
167
168static inline int inet6_iif(const struct sk_buff *skb)
169{
170 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
171
172 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
173}
174
175static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
176{
177 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
178}
179
180/* can not be used in TCP layer after tcp_v6_fill_cb */
181static inline int inet6_sdif(const struct sk_buff *skb)
182{
183#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
184 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
185 return IP6CB(skb)->iif;
186#endif
187 return 0;
188}
189
190struct tcp6_request_sock {
191 struct tcp_request_sock tcp6rsk_tcp;
192};
193
194struct ipv6_mc_socklist;
195struct ipv6_ac_socklist;
196struct ipv6_fl_socklist;
197
198struct inet6_cork {
199 struct ipv6_txoptions *opt;
200 u8 hop_limit;
201 u8 tclass;
202};
203
204/* struct ipv6_pinfo - ipv6 private area */
205struct ipv6_pinfo {
206 struct in6_addr saddr;
207 struct in6_pktinfo sticky_pktinfo;
208 const struct in6_addr *daddr_cache;
209#ifdef CONFIG_IPV6_SUBTREES
210 const struct in6_addr *saddr_cache;
211#endif
212
213 __be32 flow_label;
214 __u32 frag_size;
215
216 /*
217 * Packed in 16bits.
218 * Omit one shift by putting the signed field at MSB.
219 */
220#if defined(__BIG_ENDIAN_BITFIELD)
221 __s16 hop_limit:9;
222 __u16 __unused_1:7;
223#else
224 __u16 __unused_1:7;
225 __s16 hop_limit:9;
226#endif
227
228#if defined(__BIG_ENDIAN_BITFIELD)
229 /* Packed in 16bits. */
230 __s16 mcast_hops:9;
231 __u16 __unused_2:6,
232 mc_loop:1;
233#else
234 __u16 mc_loop:1,
235 __unused_2:6;
236 __s16 mcast_hops:9;
237#endif
238 int ucast_oif;
239 int mcast_oif;
240
241 /* pktoption flags */
242 union {
243 struct {
244 __u16 srcrt:1,
245 osrcrt:1,
246 rxinfo:1,
247 rxoinfo:1,
248 rxhlim:1,
249 rxohlim:1,
250 hopopts:1,
251 ohopopts:1,
252 dstopts:1,
253 odstopts:1,
254 rxflow:1,
255 rxtclass:1,
256 rxpmtu:1,
257 rxorigdstaddr:1,
258 recvfragsize:1;
259 /* 1 bits hole */
260 } bits;
261 __u16 all;
262 } rxopt;
263
264 /* sockopt flags */
265 __u16 recverr:1,
266 sndflow:1,
267 repflow:1,
268 pmtudisc:3,
269 padding:1, /* 1 bit hole */
270 srcprefs:3, /* 001: prefer temporary address
271 * 010: prefer public address
272 * 100: prefer care-of address
273 */
274 dontfrag:1,
275 autoflowlabel:1,
276 autoflowlabel_set:1,
277 mc_all:1,
278 recverr_rfc4884:1,
279 rtalert_isolate:1;
280 __u8 min_hopcount;
281 __u8 tclass;
282 __be32 rcv_flowinfo;
283
284 __u32 dst_cookie;
285
286 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
287 struct ipv6_ac_socklist *ipv6_ac_list;
288 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
289
290 struct ipv6_txoptions __rcu *opt;
291 struct sk_buff *pktoptions;
292 struct sk_buff *rxpmtu;
293 struct inet6_cork cork;
294};
295
296/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
297struct raw6_sock {
298 /* inet_sock has to be the first member of raw6_sock */
299 struct inet_sock inet;
300 __u32 checksum; /* perform checksum */
301 __u32 offset; /* checksum offset */
302 struct icmp6_filter filter;
303 __u32 ip6mr_table;
304
305 struct ipv6_pinfo inet6;
306};
307
308struct udp6_sock {
309 struct udp_sock udp;
310
311 struct ipv6_pinfo inet6;
312};
313
314struct tcp6_sock {
315 struct tcp_sock tcp;
316
317 struct ipv6_pinfo inet6;
318};
319
320extern int inet6_sk_rebuild_header(struct sock *sk);
321
322struct tcp6_timewait_sock {
323 struct tcp_timewait_sock tcp6tw_tcp;
324};
325
326#if IS_ENABLED(CONFIG_IPV6)
327bool ipv6_mod_enabled(void);
328
329static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
330{
331 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
332}
333
334#define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk)
335
336#define ipv6_only_sock(sk) (sk->sk_ipv6only)
337#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
338 inet6_sk(sk)->rxopt.bits.rxinfo)
339
340static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
341{
342 if (sk->sk_family == AF_INET6)
343 return &sk->sk_v6_rcv_saddr;
344 return NULL;
345}
346
347static inline int inet_v6_ipv6only(const struct sock *sk)
348{
349 /* ipv6only field is at same position for timewait and other sockets */
350 return ipv6_only_sock(sk);
351}
352#else
353#define ipv6_only_sock(sk) 0
354#define ipv6_sk_rxinfo(sk) 0
355
356static inline bool ipv6_mod_enabled(void)
357{
358 return false;
359}
360
361static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
362{
363 return NULL;
364}
365
366static inline struct raw6_sock *raw6_sk(const struct sock *sk)
367{
368 return NULL;
369}
370
371#define inet6_rcv_saddr(__sk) NULL
372#define inet_v6_ipv6only(__sk) 0
373#endif /* IS_ENABLED(CONFIG_IPV6) */
374#endif /* _IPV6_H */