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