1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _IPV6_H
3 #define _IPV6_H
4
5 #include <uapi/linux/ipv6.h>
6 #include <linux/android_kabi.h>
7
8 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
9 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
10 /*
11 * This structure contains configuration options per IPv6 link.
12 */
13 struct ipv6_devconf {
14 __s32 forwarding;
15 __s32 hop_limit;
16 __s32 mtu6;
17 __s32 accept_ra;
18 __s32 accept_redirects;
19 __s32 autoconf;
20 __s32 dad_transmits;
21 __s32 rtr_solicits;
22 __s32 rtr_solicit_interval;
23 __s32 rtr_solicit_max_interval;
24 __s32 rtr_solicit_delay;
25 __s32 force_mld_version;
26 __s32 mldv1_unsolicited_report_interval;
27 __s32 mldv2_unsolicited_report_interval;
28 __s32 use_tempaddr;
29 __s32 temp_valid_lft;
30 __s32 temp_prefered_lft;
31 __s32 regen_max_retry;
32 __s32 max_desync_factor;
33 __s32 max_addresses;
34 __s32 accept_ra_defrtr;
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 accept_ra_rt_table;
47 __s32 proxy_ndp;
48 __s32 accept_source_route;
49 __s32 accept_ra_from_local;
50 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
51 __s32 optimistic_dad;
52 __s32 use_optimistic;
53 #endif
54 #ifdef CONFIG_IPV6_MROUTE
55 atomic_t mc_forwarding;
56 #endif
57 __s32 disable_ipv6;
58 __s32 drop_unicast_in_l2_multicast;
59 __s32 accept_dad;
60 __s32 force_tllao;
61 __s32 ndisc_notify;
62 __s32 suppress_frag_ndisc;
63 __s32 accept_ra_mtu;
64 __s32 drop_unsolicited_na;
65 struct ipv6_stable_secret {
66 bool initialized;
67 struct in6_addr secret;
68 } stable_secret;
69 __s32 use_oif_addrs_only;
70 __s32 keep_addr_on_down;
71 __s32 seg6_enabled;
72 #ifdef CONFIG_IPV6_SEG6_HMAC
73 __s32 seg6_require_hmac;
74 #endif
75 __u32 enhanced_dad;
76 __u32 addr_gen_mode;
77 __s32 disable_policy;
78 __s32 ndisc_tclass;
79
80 struct ctl_table_header *sysctl_header;
81
82 ANDROID_KABI_RESERVE(1);
83 ANDROID_KABI_RESERVE(2);
84 ANDROID_KABI_RESERVE(3);
85 ANDROID_KABI_RESERVE(4);
86 };
87
88 struct ipv6_params {
89 __s32 disable_ipv6;
90 __s32 autoconf;
91 };
92 extern struct ipv6_params ipv6_defaults;
93 #include <linux/tcp.h>
94 #include <linux/udp.h>
95
96 #include <net/inet_sock.h>
97
ipv6_hdr(const struct sk_buff * skb)98 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
99 {
100 return (struct ipv6hdr *)skb_network_header(skb);
101 }
102
inner_ipv6_hdr(const struct sk_buff * skb)103 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
104 {
105 return (struct ipv6hdr *)skb_inner_network_header(skb);
106 }
107
ipipv6_hdr(const struct sk_buff * skb)108 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
109 {
110 return (struct ipv6hdr *)skb_transport_header(skb);
111 }
112
ipv6_transport_len(const struct sk_buff * skb)113 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
114 {
115 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
116 skb_network_header_len(skb);
117 }
118
119 /*
120 This structure contains results of exthdrs parsing
121 as offsets from skb->nh.
122 */
123
124 struct inet6_skb_parm {
125 int iif;
126 __be16 ra;
127 __u16 dst0;
128 __u16 srcrt;
129 __u16 dst1;
130 __u16 lastopt;
131 __u16 nhoff;
132 __u16 flags;
133 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
134 __u16 dsthao;
135 #endif
136 __u16 frag_max_size;
137
138 #define IP6SKB_XFRM_TRANSFORMED 1
139 #define IP6SKB_FORWARDED 2
140 #define IP6SKB_REROUTED 4
141 #define IP6SKB_ROUTERALERT 8
142 #define IP6SKB_FRAGMENTED 16
143 #define IP6SKB_HOPBYHOP 32
144 #define IP6SKB_L3SLAVE 64
145 #define IP6SKB_JUMBOGRAM 128
146 };
147
148 #if defined(CONFIG_NET_L3_MASTER_DEV)
ipv6_l3mdev_skb(__u16 flags)149 static inline bool ipv6_l3mdev_skb(__u16 flags)
150 {
151 return flags & IP6SKB_L3SLAVE;
152 }
153 #else
ipv6_l3mdev_skb(__u16 flags)154 static inline bool ipv6_l3mdev_skb(__u16 flags)
155 {
156 return false;
157 }
158 #endif
159
160 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
161 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
162
inet6_iif(const struct sk_buff * skb)163 static inline int inet6_iif(const struct sk_buff *skb)
164 {
165 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
166
167 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
168 }
169
inet6_is_jumbogram(const struct sk_buff * skb)170 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
171 {
172 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
173 }
174
175 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_sdif(const struct sk_buff * skb)176 static inline int inet6_sdif(const struct sk_buff *skb)
177 {
178 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
179 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
180 return IP6CB(skb)->iif;
181 #endif
182 return 0;
183 }
184
185 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_exact_dif_match(struct net * net,struct sk_buff * skb)186 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
187 {
188 #if defined(CONFIG_NET_L3_MASTER_DEV)
189 if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
190 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
191 return true;
192 #endif
193 return false;
194 }
195
196 struct tcp6_request_sock {
197 struct tcp_request_sock tcp6rsk_tcp;
198 };
199
200 struct ipv6_mc_socklist;
201 struct ipv6_ac_socklist;
202 struct ipv6_fl_socklist;
203
204 struct inet6_cork {
205 struct ipv6_txoptions *opt;
206 u8 hop_limit;
207 u8 tclass;
208 };
209
210 /**
211 * struct ipv6_pinfo - ipv6 private area
212 *
213 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
214 * this _must_ be the last member, so that inet6_sk_generic
215 * is able to calculate its offset from the base struct sock
216 * by using the struct proto->slab_obj_size member. -acme
217 */
218 struct ipv6_pinfo {
219 struct in6_addr saddr;
220 struct in6_pktinfo sticky_pktinfo;
221 const struct in6_addr *daddr_cache;
222 #ifdef CONFIG_IPV6_SUBTREES
223 const struct in6_addr *saddr_cache;
224 #endif
225
226 __be32 flow_label;
227 __u32 frag_size;
228
229 /*
230 * Packed in 16bits.
231 * Omit one shift by by putting the signed field at MSB.
232 */
233 #if defined(__BIG_ENDIAN_BITFIELD)
234 __s16 hop_limit:9;
235 __u16 __unused_1:7;
236 #else
237 __u16 __unused_1:7;
238 __s16 hop_limit:9;
239 #endif
240
241 #if defined(__BIG_ENDIAN_BITFIELD)
242 /* Packed in 16bits. */
243 __s16 mcast_hops:9;
244 __u16 __unused_2:6,
245 mc_loop:1;
246 #else
247 __u16 mc_loop:1,
248 __unused_2:6;
249 __s16 mcast_hops:9;
250 #endif
251 int ucast_oif;
252 int mcast_oif;
253
254 /* pktoption flags */
255 union {
256 struct {
257 __u16 srcrt:1,
258 osrcrt:1,
259 rxinfo:1,
260 rxoinfo:1,
261 rxhlim:1,
262 rxohlim:1,
263 hopopts:1,
264 ohopopts:1,
265 dstopts:1,
266 odstopts:1,
267 rxflow:1,
268 rxtclass:1,
269 rxpmtu:1,
270 rxorigdstaddr:1,
271 recvfragsize:1;
272 /* 1 bits hole */
273 } bits;
274 __u16 all;
275 } rxopt;
276
277 /* sockopt flags */
278 __u16 recverr:1,
279 sndflow:1,
280 repflow:1,
281 pmtudisc:3,
282 padding:1, /* 1 bit hole */
283 srcprefs:3, /* 001: prefer temporary address
284 * 010: prefer public address
285 * 100: prefer care-of address
286 */
287 dontfrag:1,
288 autoflowlabel:1,
289 autoflowlabel_set:1,
290 mc_all:1,
291 rtalert_isolate:1;
292 __u8 min_hopcount;
293 __u8 tclass;
294 __be32 rcv_flowinfo;
295
296 __u32 dst_cookie;
297 __u32 rx_dst_cookie;
298
299 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
300 struct ipv6_ac_socklist *ipv6_ac_list;
301 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
302
303 struct ipv6_txoptions __rcu *opt;
304 struct sk_buff *pktoptions;
305 struct sk_buff *rxpmtu;
306 struct inet6_cork cork;
307 };
308
309 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
310 struct raw6_sock {
311 /* inet_sock has to be the first member of raw6_sock */
312 struct inet_sock inet;
313 __u32 checksum; /* perform checksum */
314 __u32 offset; /* checksum offset */
315 struct icmp6_filter filter;
316 __u32 ip6mr_table;
317 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
318 struct ipv6_pinfo inet6;
319 };
320
321 struct udp6_sock {
322 struct udp_sock udp;
323 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
324 struct ipv6_pinfo inet6;
325 };
326
327 struct tcp6_sock {
328 struct tcp_sock tcp;
329 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
330 struct ipv6_pinfo inet6;
331 };
332
333 extern int inet6_sk_rebuild_header(struct sock *sk);
334
335 struct tcp6_timewait_sock {
336 struct tcp_timewait_sock tcp6tw_tcp;
337 };
338
339 #if IS_ENABLED(CONFIG_IPV6)
340 bool ipv6_mod_enabled(void);
341
inet6_sk(const struct sock * __sk)342 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
343 {
344 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
345 }
346
raw6_sk(const struct sock * sk)347 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
348 {
349 return (struct raw6_sock *)sk;
350 }
351
inet_sk_copy_descendant(struct sock * sk_to,const struct sock * sk_from)352 static inline void inet_sk_copy_descendant(struct sock *sk_to,
353 const struct sock *sk_from)
354 {
355 int ancestor_size = sizeof(struct inet_sock);
356
357 if (sk_from->sk_family == PF_INET6)
358 ancestor_size += sizeof(struct ipv6_pinfo);
359
360 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
361 }
362
363 #define __ipv6_only_sock(sk) (sk->sk_ipv6only)
364 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
365 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
366 inet6_sk(sk)->rxopt.bits.rxinfo)
367
inet6_rcv_saddr(const struct sock * sk)368 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
369 {
370 if (sk->sk_family == AF_INET6)
371 return &sk->sk_v6_rcv_saddr;
372 return NULL;
373 }
374
inet_v6_ipv6only(const struct sock * sk)375 static inline int inet_v6_ipv6only(const struct sock *sk)
376 {
377 /* ipv6only field is at same position for timewait and other sockets */
378 return ipv6_only_sock(sk);
379 }
380 #else
381 #define __ipv6_only_sock(sk) 0
382 #define ipv6_only_sock(sk) 0
383 #define ipv6_sk_rxinfo(sk) 0
384
ipv6_mod_enabled(void)385 static inline bool ipv6_mod_enabled(void)
386 {
387 return false;
388 }
389
inet6_sk(const struct sock * __sk)390 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
391 {
392 return NULL;
393 }
394
395 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)396 inet6_rsk(const struct request_sock *rsk)
397 {
398 return NULL;
399 }
400
raw6_sk(const struct sock * sk)401 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
402 {
403 return NULL;
404 }
405
406 #define inet6_rcv_saddr(__sk) NULL
407 #define tcp_twsk_ipv6only(__sk) 0
408 #define inet_v6_ipv6only(__sk) 0
409 #endif /* IS_ENABLED(CONFIG_IPV6) */
410 #endif /* _IPV6_H */
411