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 __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
82 struct ipv6_params {
83 __s32 disable_ipv6;
84 __s32 autoconf;
85 };
86 extern 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
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 /* can not be used in TCP layer after tcp_v6_fill_cb */
181 static 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
191 struct tcp6_request_sock {
192 struct tcp_request_sock tcp6rsk_tcp;
193 };
194
195 struct ipv6_mc_socklist;
196 struct ipv6_ac_socklist;
197 struct ipv6_fl_socklist;
198
199 struct 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 */
213 struct 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 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 rtalert_isolate:1;
287 __u8 min_hopcount;
288 __u8 tclass;
289 __be32 rcv_flowinfo;
290
291 __u32 dst_cookie;
292 __u32 rx_dst_cookie;
293
294 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
295 struct ipv6_ac_socklist *ipv6_ac_list;
296 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
297
298 struct ipv6_txoptions __rcu *opt;
299 struct sk_buff *pktoptions;
300 struct sk_buff *rxpmtu;
301 struct inet6_cork cork;
302 };
303
304 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
305 struct raw6_sock {
306 /* inet_sock has to be the first member of raw6_sock */
307 struct inet_sock inet;
308 __u32 checksum; /* perform checksum */
309 __u32 offset; /* checksum offset */
310 struct icmp6_filter filter;
311 __u32 ip6mr_table;
312 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
313 struct ipv6_pinfo inet6;
314 };
315
316 struct udp6_sock {
317 struct udp_sock udp;
318 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
319 struct ipv6_pinfo inet6;
320 };
321
322 struct tcp6_sock {
323 struct tcp_sock tcp;
324 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
325 struct ipv6_pinfo inet6;
326 };
327
328 extern int inet6_sk_rebuild_header(struct sock *sk);
329
330 struct tcp6_timewait_sock {
331 struct tcp_timewait_sock tcp6tw_tcp;
332 };
333
334 #if IS_ENABLED(CONFIG_IPV6)
335 bool ipv6_mod_enabled(void);
336
337 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
338 {
339 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
340 }
341
342 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
343 {
344 return (struct raw6_sock *)sk;
345 }
346
347 static inline void inet_sk_copy_descendant(struct sock *sk_to,
348 const struct sock *sk_from)
349 {
350 int ancestor_size = sizeof(struct inet_sock);
351
352 if (sk_from->sk_family == PF_INET6)
353 ancestor_size += sizeof(struct ipv6_pinfo);
354
355 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
356 }
357
358 #define __ipv6_only_sock(sk) (sk->sk_ipv6only)
359 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
360 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
361 inet6_sk(sk)->rxopt.bits.rxinfo)
362
363 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
364 {
365 if (sk->sk_family == AF_INET6)
366 return &sk->sk_v6_rcv_saddr;
367 return NULL;
368 }
369
370 static inline int inet_v6_ipv6only(const struct sock *sk)
371 {
372 /* ipv6only field is at same position for timewait and other sockets */
373 return ipv6_only_sock(sk);
374 }
375 #else
376 #define __ipv6_only_sock(sk) 0
377 #define ipv6_only_sock(sk) 0
378 #define ipv6_sk_rxinfo(sk) 0
379
380 static inline bool ipv6_mod_enabled(void)
381 {
382 return false;
383 }
384
385 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
386 {
387 return NULL;
388 }
389
390 static inline struct inet6_request_sock *
391 inet6_rsk(const struct request_sock *rsk)
392 {
393 return NULL;
394 }
395
396 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
397 {
398 return NULL;
399 }
400
401 #define inet6_rcv_saddr(__sk) NULL
402 #define tcp_twsk_ipv6only(__sk) 0
403 #define inet_v6_ipv6only(__sk) 0
404 #endif /* IS_ENABLED(CONFIG_IPV6) */
405 #endif /* _IPV6_H */
406
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