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
180/* can not be used in TCP layer after tcp_v6_fill_cb */
181static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
182{
183#if defined(CONFIG_NET_L3_MASTER_DEV)
184 if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
185 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
186 return true;
187#endif
188 return false;
189}
190
191struct tcp6_request_sock {
192 struct tcp_request_sock tcp6rsk_tcp;
193};
194
195struct ipv6_mc_socklist;
196struct ipv6_ac_socklist;
197struct ipv6_fl_socklist;
198
199struct inet6_cork {
200 struct ipv6_txoptions *opt;
201 u8 hop_limit;
202 u8 tclass;
203};
204
205/**
206 * struct ipv6_pinfo - ipv6 private area
207 *
208 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
209 * this _must_ be the last member, so that inet6_sk_generic
210 * is able to calculate its offset from the base struct sock
211 * by using the struct proto->slab_obj_size member. -acme
212 */
213struct ipv6_pinfo {
214 struct in6_addr saddr;
215 struct in6_pktinfo sticky_pktinfo;
216 const struct in6_addr *daddr_cache;
217#ifdef CONFIG_IPV6_SUBTREES
218 const struct in6_addr *saddr_cache;
219#endif
220
221 __be32 flow_label;
222 __u32 frag_size;
223
224 /*
225 * Packed in 16bits.
226 * Omit one shift by putting the signed field at MSB.
227 */
228#if defined(__BIG_ENDIAN_BITFIELD)
229 __s16 hop_limit:9;
230 __u16 __unused_1:7;
231#else
232 __u16 __unused_1:7;
233 __s16 hop_limit:9;
234#endif
235
236#if defined(__BIG_ENDIAN_BITFIELD)
237 /* Packed in 16bits. */
238 __s16 mcast_hops:9;
239 __u16 __unused_2:6,
240 mc_loop:1;
241#else
242 __u16 mc_loop:1,
243 __unused_2:6;
244 __s16 mcast_hops:9;
245#endif
246 int ucast_oif;
247 int mcast_oif;
248
249 /* pktoption flags */
250 union {
251 struct {
252 __u16 srcrt:1,
253 osrcrt:1,
254 rxinfo:1,
255 rxoinfo:1,
256 rxhlim:1,
257 rxohlim:1,
258 hopopts:1,
259 ohopopts:1,
260 dstopts:1,
261 odstopts:1,
262 rxflow:1,
263 rxtclass:1,
264 rxpmtu:1,
265 rxorigdstaddr:1,
266 recvfragsize:1;
267 /* 1 bits hole */
268 } bits;
269 __u16 all;
270 } rxopt;
271
272 /* sockopt flags */
273 __u16 recverr:1,
274 sndflow:1,
275 repflow:1,
276 pmtudisc:3,
277 padding:1, /* 1 bit hole */
278 srcprefs:3, /* 001: prefer temporary address
279 * 010: prefer public address
280 * 100: prefer care-of address
281 */
282 dontfrag:1,
283 autoflowlabel:1,
284 autoflowlabel_set:1,
285 mc_all:1,
286 recverr_rfc4884:1,
287 rtalert_isolate:1;
288 __u8 min_hopcount;
289 __u8 tclass;
290 __be32 rcv_flowinfo;
291
292 __u32 dst_cookie;
293 __u32 rx_dst_cookie;
294
295 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
296 struct ipv6_ac_socklist *ipv6_ac_list;
297 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
298
299 struct ipv6_txoptions __rcu *opt;
300 struct sk_buff *pktoptions;
301 struct sk_buff *rxpmtu;
302 struct inet6_cork cork;
303};
304
305/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
306struct raw6_sock {
307 /* inet_sock has to be the first member of raw6_sock */
308 struct inet_sock inet;
309 __u32 checksum; /* perform checksum */
310 __u32 offset; /* checksum offset */
311 struct icmp6_filter filter;
312 __u32 ip6mr_table;
313 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
314 struct ipv6_pinfo inet6;
315};
316
317struct udp6_sock {
318 struct udp_sock udp;
319 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
320 struct ipv6_pinfo inet6;
321};
322
323struct tcp6_sock {
324 struct tcp_sock tcp;
325 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
326 struct ipv6_pinfo inet6;
327};
328
329extern int inet6_sk_rebuild_header(struct sock *sk);
330
331struct tcp6_timewait_sock {
332 struct tcp_timewait_sock tcp6tw_tcp;
333};
334
335#if IS_ENABLED(CONFIG_IPV6)
336bool ipv6_mod_enabled(void);
337
338static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
339{
340 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
341}
342
343static inline struct raw6_sock *raw6_sk(const struct sock *sk)
344{
345 return (struct raw6_sock *)sk;
346}
347
348static inline void inet_sk_copy_descendant(struct sock *sk_to,
349 const struct sock *sk_from)
350{
351 int ancestor_size = sizeof(struct inet_sock);
352
353 if (sk_from->sk_family == PF_INET6)
354 ancestor_size += sizeof(struct ipv6_pinfo);
355
356 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
357}
358
359#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
360#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
361#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
362 inet6_sk(sk)->rxopt.bits.rxinfo)
363
364static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
365{
366 if (sk->sk_family == AF_INET6)
367 return &sk->sk_v6_rcv_saddr;
368 return NULL;
369}
370
371static inline int inet_v6_ipv6only(const struct sock *sk)
372{
373 /* ipv6only field is at same position for timewait and other sockets */
374 return ipv6_only_sock(sk);
375}
376#else
377#define __ipv6_only_sock(sk) 0
378#define ipv6_only_sock(sk) 0
379#define ipv6_sk_rxinfo(sk) 0
380
381static inline bool ipv6_mod_enabled(void)
382{
383 return false;
384}
385
386static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
387{
388 return NULL;
389}
390
391static inline struct inet6_request_sock *
392 inet6_rsk(const struct request_sock *rsk)
393{
394 return NULL;
395}
396
397static inline struct raw6_sock *raw6_sk(const struct sock *sk)
398{
399 return NULL;
400}
401
402#define inet6_rcv_saddr(__sk) NULL
403#define tcp_twsk_ipv6only(__sk) 0
404#define inet_v6_ipv6only(__sk) 0
405#endif /* IS_ENABLED(CONFIG_IPV6) */
406#endif /* _IPV6_H */