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 */
12 struct 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_pinfo;
37 __s32 ignore_routes_with_linkdown;
38 #ifdef CONFIG_IPV6_ROUTER_PREF
39 __s32 accept_ra_rtr_pref;
40 __s32 rtr_probe_interval;
41 #ifdef CONFIG_IPV6_ROUTE_INFO
42 __s32 accept_ra_rt_info_min_plen;
43 __s32 accept_ra_rt_info_max_plen;
44 #endif
45 #endif
46 __s32 proxy_ndp;
47 __s32 accept_source_route;
48 __s32 accept_ra_from_local;
49 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
50 __s32 optimistic_dad;
51 __s32 use_optimistic;
52 #endif
53 #ifdef CONFIG_IPV6_MROUTE
54 __s32 mc_forwarding;
55 #endif
56 __s32 disable_ipv6;
57 __s32 drop_unicast_in_l2_multicast;
58 __s32 accept_dad;
59 __s32 force_tllao;
60 __s32 ndisc_notify;
61 __s32 suppress_frag_ndisc;
62 __s32 accept_ra_mtu;
63 __s32 drop_unsolicited_na;
64 struct ipv6_stable_secret {
65 bool initialized;
66 struct in6_addr secret;
67 } stable_secret;
68 __s32 use_oif_addrs_only;
69 __s32 keep_addr_on_down;
70 __s32 seg6_enabled;
71 #ifdef CONFIG_IPV6_SEG6_HMAC
72 __s32 seg6_require_hmac;
73 #endif
74 __u32 enhanced_dad;
75 __u32 addr_gen_mode;
76 __s32 disable_policy;
77 __s32 ndisc_tclass;
78 __s32 rpl_seg_enabled;
79
80 struct ctl_table_header *sysctl_header;
81 };
82
83 struct ipv6_params {
84 __s32 disable_ipv6;
85 __s32 autoconf;
86 };
87 extern struct ipv6_params ipv6_defaults;
88 #include <linux/tcp.h>
89 #include <linux/udp.h>
90
91 #include <net/inet_sock.h>
92
93 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
94 {
95 return (struct ipv6hdr *)skb_network_header(skb);
96 }
97
98 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
99 {
100 return (struct ipv6hdr *)skb_inner_network_header(skb);
101 }
102
103 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
104 {
105 return (struct ipv6hdr *)skb_transport_header(skb);
106 }
107
108 static 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
119 struct 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)
144 static inline bool ipv6_l3mdev_skb(__u16 flags)
145 {
146 return flags & IP6SKB_L3SLAVE;
147 }
148 #else
149 static 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
158 static 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
165 static 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 */
171 static 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 struct tcp6_request_sock {
181 struct tcp_request_sock tcp6rsk_tcp;
182 };
183
184 struct ipv6_mc_socklist;
185 struct ipv6_ac_socklist;
186 struct ipv6_fl_socklist;
187
188 struct 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 */
202 struct 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! */
295 struct 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
306 struct 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
312 struct 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
318 extern int inet6_sk_rebuild_header(struct sock *sk);
319
320 struct tcp6_timewait_sock {
321 struct tcp_timewait_sock tcp6tw_tcp;
322 };
323
324 #if IS_ENABLED(CONFIG_IPV6)
325 bool ipv6_mod_enabled(void);
326
327 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
328 {
329 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
330 }
331
332 static 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
342 static 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
349 static 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
359 static inline bool ipv6_mod_enabled(void)
360 {
361 return false;
362 }
363
364 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
365 {
366 return NULL;
367 }
368
369 static inline struct inet6_request_sock *
370 inet6_rsk(const struct request_sock *rsk)
371 {
372 return NULL;
373 }
374
375 static 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 */
385
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