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 */
11 struct 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_max_plen;
41 #endif
42 #endif
43 __s32 proxy_ndp;
44 __s32 accept_source_route;
45 __s32 accept_ra_from_local;
46 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
47 __s32 optimistic_dad;
48 __s32 use_optimistic;
49 #endif
50 #ifdef CONFIG_IPV6_MROUTE
51 __s32 mc_forwarding;
52 #endif
53 __s32 disable_ipv6;
54 __s32 drop_unicast_in_l2_multicast;
55 __s32 accept_dad;
56 __s32 force_tllao;
57 __s32 ndisc_notify;
58 __s32 suppress_frag_ndisc;
59 __s32 accept_ra_mtu;
60 __s32 drop_unsolicited_na;
61 struct ipv6_stable_secret {
62 bool initialized;
63 struct in6_addr secret;
64 } stable_secret;
65 __s32 use_oif_addrs_only;
66 __s32 keep_addr_on_down;
67 __s32 seg6_enabled;
68 #ifdef CONFIG_IPV6_SEG6_HMAC
69 __s32 seg6_require_hmac;
70 #endif
71 __u32 enhanced_dad;
72 __u32 addr_gen_mode;
73
74 struct ctl_table_header *sysctl_header;
75 };
76
77 struct ipv6_params {
78 __s32 disable_ipv6;
79 __s32 autoconf;
80 };
81 extern struct ipv6_params ipv6_defaults;
82 #include <linux/icmpv6.h>
83 #include <linux/tcp.h>
84 #include <linux/udp.h>
85
86 #include <net/inet_sock.h>
87
88 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
89 {
90 return (struct ipv6hdr *)skb_network_header(skb);
91 }
92
93 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
94 {
95 return (struct ipv6hdr *)skb_inner_network_header(skb);
96 }
97
98 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
99 {
100 return (struct ipv6hdr *)skb_transport_header(skb);
101 }
102
103 /*
104 This structure contains results of exthdrs parsing
105 as offsets from skb->nh.
106 */
107
108 struct inet6_skb_parm {
109 int iif;
110 __be16 ra;
111 __u16 dst0;
112 __u16 srcrt;
113 __u16 dst1;
114 __u16 lastopt;
115 __u16 nhoff;
116 __u16 flags;
117 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
118 __u16 dsthao;
119 #endif
120 __u16 frag_max_size;
121
122 #define IP6SKB_XFRM_TRANSFORMED 1
123 #define IP6SKB_FORWARDED 2
124 #define IP6SKB_REROUTED 4
125 #define IP6SKB_ROUTERALERT 8
126 #define IP6SKB_FRAGMENTED 16
127 #define IP6SKB_HOPBYHOP 32
128 #define IP6SKB_L3SLAVE 64
129 };
130
131 #if defined(CONFIG_NET_L3_MASTER_DEV)
132 static inline bool ipv6_l3mdev_skb(__u16 flags)
133 {
134 return flags & IP6SKB_L3SLAVE;
135 }
136 #else
137 static inline bool ipv6_l3mdev_skb(__u16 flags)
138 {
139 return false;
140 }
141 #endif
142
143 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
144 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
145
146 static inline int inet6_iif(const struct sk_buff *skb)
147 {
148 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
149
150 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
151 }
152
153 /* can not be used in TCP layer after tcp_v6_fill_cb */
154 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
155 {
156 #if defined(CONFIG_NET_L3_MASTER_DEV)
157 if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
158 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
159 return true;
160 #endif
161 return false;
162 }
163
164 struct tcp6_request_sock {
165 struct tcp_request_sock tcp6rsk_tcp;
166 };
167
168 struct ipv6_mc_socklist;
169 struct ipv6_ac_socklist;
170 struct ipv6_fl_socklist;
171
172 struct inet6_cork {
173 struct ipv6_txoptions *opt;
174 u8 hop_limit;
175 u8 tclass;
176 };
177
178 /**
179 * struct ipv6_pinfo - ipv6 private area
180 *
181 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
182 * this _must_ be the last member, so that inet6_sk_generic
183 * is able to calculate its offset from the base struct sock
184 * by using the struct proto->slab_obj_size member. -acme
185 */
186 struct ipv6_pinfo {
187 struct in6_addr saddr;
188 struct in6_pktinfo sticky_pktinfo;
189 const struct in6_addr *daddr_cache;
190 #ifdef CONFIG_IPV6_SUBTREES
191 const struct in6_addr *saddr_cache;
192 #endif
193
194 __be32 flow_label;
195 __u32 frag_size;
196
197 /*
198 * Packed in 16bits.
199 * Omit one shift by by putting the signed field at MSB.
200 */
201 #if defined(__BIG_ENDIAN_BITFIELD)
202 __s16 hop_limit:9;
203 __u16 __unused_1:7;
204 #else
205 __u16 __unused_1:7;
206 __s16 hop_limit:9;
207 #endif
208
209 #if defined(__BIG_ENDIAN_BITFIELD)
210 /* Packed in 16bits. */
211 __s16 mcast_hops:9;
212 __u16 __unused_2:6,
213 mc_loop:1;
214 #else
215 __u16 mc_loop:1,
216 __unused_2:6;
217 __s16 mcast_hops:9;
218 #endif
219 int ucast_oif;
220 int mcast_oif;
221
222 /* pktoption flags */
223 union {
224 struct {
225 __u16 srcrt:1,
226 osrcrt:1,
227 rxinfo:1,
228 rxoinfo:1,
229 rxhlim:1,
230 rxohlim:1,
231 hopopts:1,
232 ohopopts:1,
233 dstopts:1,
234 odstopts:1,
235 rxflow:1,
236 rxtclass:1,
237 rxpmtu:1,
238 rxorigdstaddr:1,
239 recvfragsize:1;
240 /* 1 bits hole */
241 } bits;
242 __u16 all;
243 } rxopt;
244
245 /* sockopt flags */
246 __u16 recverr:1,
247 sndflow:1,
248 repflow:1,
249 pmtudisc:3,
250 padding:1, /* 1 bit hole */
251 srcprefs:3, /* 001: prefer temporary address
252 * 010: prefer public address
253 * 100: prefer care-of address
254 */
255 dontfrag:1,
256 autoflowlabel:1;
257 __u8 min_hopcount;
258 __u8 tclass;
259 __be32 rcv_flowinfo;
260
261 __u32 dst_cookie;
262 __u32 rx_dst_cookie;
263
264 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
265 struct ipv6_ac_socklist *ipv6_ac_list;
266 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
267
268 struct ipv6_txoptions __rcu *opt;
269 struct sk_buff *pktoptions;
270 struct sk_buff *rxpmtu;
271 struct inet6_cork cork;
272 };
273
274 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
275 struct raw6_sock {
276 /* inet_sock has to be the first member of raw6_sock */
277 struct inet_sock inet;
278 __u32 checksum; /* perform checksum */
279 __u32 offset; /* checksum offset */
280 struct icmp6_filter filter;
281 __u32 ip6mr_table;
282 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
283 struct ipv6_pinfo inet6;
284 };
285
286 struct udp6_sock {
287 struct udp_sock udp;
288 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
289 struct ipv6_pinfo inet6;
290 };
291
292 struct tcp6_sock {
293 struct tcp_sock tcp;
294 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
295 struct ipv6_pinfo inet6;
296 };
297
298 extern int inet6_sk_rebuild_header(struct sock *sk);
299
300 struct tcp6_timewait_sock {
301 struct tcp_timewait_sock tcp6tw_tcp;
302 };
303
304 #if IS_ENABLED(CONFIG_IPV6)
305 bool ipv6_mod_enabled(void);
306
307 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
308 {
309 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
310 }
311
312 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
313 {
314 return (struct raw6_sock *)sk;
315 }
316
317 static inline void inet_sk_copy_descendant(struct sock *sk_to,
318 const struct sock *sk_from)
319 {
320 int ancestor_size = sizeof(struct inet_sock);
321
322 if (sk_from->sk_family == PF_INET6)
323 ancestor_size += sizeof(struct ipv6_pinfo);
324
325 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
326 }
327
328 #define __ipv6_only_sock(sk) (sk->sk_ipv6only)
329 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
330 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
331 inet6_sk(sk)->rxopt.bits.rxinfo)
332
333 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
334 {
335 if (sk->sk_family == AF_INET6)
336 return &sk->sk_v6_rcv_saddr;
337 return NULL;
338 }
339
340 static inline int inet_v6_ipv6only(const struct sock *sk)
341 {
342 /* ipv6only field is at same position for timewait and other sockets */
343 return ipv6_only_sock(sk);
344 }
345 #else
346 #define __ipv6_only_sock(sk) 0
347 #define ipv6_only_sock(sk) 0
348 #define ipv6_sk_rxinfo(sk) 0
349
350 static inline bool ipv6_mod_enabled(void)
351 {
352 return false;
353 }
354
355 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
356 {
357 return NULL;
358 }
359
360 static inline struct inet6_request_sock *
361 inet6_rsk(const struct request_sock *rsk)
362 {
363 return NULL;
364 }
365
366 static 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 tcp_twsk_ipv6only(__sk) 0
373 #define inet_v6_ipv6only(__sk) 0
374 #endif /* IS_ENABLED(CONFIG_IPV6) */
375 #endif /* _IPV6_H */
376
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