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 __u32 ra_defrtr_metric;
36 __s32 accept_ra_min_hop_limit;
37 __s32 accept_ra_pinfo;
38 __s32 ignore_routes_with_linkdown;
39 #ifdef CONFIG_IPV6_ROUTER_PREF
40 __s32 accept_ra_rtr_pref;
41 __s32 rtr_probe_interval;
42 #ifdef CONFIG_IPV6_ROUTE_INFO
43 __s32 accept_ra_rt_info_min_plen;
44 __s32 accept_ra_rt_info_max_plen;
45 #endif
46 #endif
47 __s32 accept_ra_rt_table;
48 __s32 proxy_ndp;
49 __s32 accept_source_route;
50 __s32 accept_ra_from_local;
51 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
52 __s32 optimistic_dad;
53 __s32 use_optimistic;
54 #endif
55 #ifdef CONFIG_IPV6_MROUTE
56 atomic_t mc_forwarding;
57 #endif
58 __s32 disable_ipv6;
59 __s32 drop_unicast_in_l2_multicast;
60 __s32 accept_dad;
61 __s32 force_tllao;
62 __s32 ndisc_notify;
63 __s32 suppress_frag_ndisc;
64 __s32 accept_ra_mtu;
65 __s32 drop_unsolicited_na;
66 struct ipv6_stable_secret {
67 bool initialized;
68 struct in6_addr secret;
69 } stable_secret;
70 __s32 use_oif_addrs_only;
71 __s32 keep_addr_on_down;
72 __s32 seg6_enabled;
73 #ifdef CONFIG_IPV6_SEG6_HMAC
74 __s32 seg6_require_hmac;
75 #endif
76 __u32 enhanced_dad;
77 __u32 addr_gen_mode;
78 __s32 disable_policy;
79 __s32 ndisc_tclass;
80 __s32 rpl_seg_enabled;
81 __u32 ioam6_id;
82 __u32 ioam6_id_wide;
83 __u8 ioam6_enabled;
84
85 struct ctl_table_header *sysctl_header;
86
87 ANDROID_KABI_USE(1, struct { __s32 accept_ra_min_lft; u32 padding; });
88
89 ANDROID_KABI_RESERVE(2);
90 ANDROID_KABI_RESERVE(3);
91 ANDROID_KABI_RESERVE(4);
92 };
93
94 struct ipv6_params {
95 __s32 disable_ipv6;
96 __s32 autoconf;
97 };
98 extern struct ipv6_params ipv6_defaults;
99 #include <linux/tcp.h>
100 #include <linux/udp.h>
101
102 #include <net/inet_sock.h>
103
ipv6_hdr(const struct sk_buff * skb)104 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
105 {
106 return (struct ipv6hdr *)skb_network_header(skb);
107 }
108
inner_ipv6_hdr(const struct sk_buff * skb)109 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
110 {
111 return (struct ipv6hdr *)skb_inner_network_header(skb);
112 }
113
ipipv6_hdr(const struct sk_buff * skb)114 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
115 {
116 return (struct ipv6hdr *)skb_transport_header(skb);
117 }
118
ipv6_transport_len(const struct sk_buff * skb)119 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
120 {
121 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
122 skb_network_header_len(skb);
123 }
124
125 /*
126 This structure contains results of exthdrs parsing
127 as offsets from skb->nh.
128 */
129
130 struct inet6_skb_parm {
131 int iif;
132 __be16 ra;
133 __u16 dst0;
134 __u16 srcrt;
135 __u16 dst1;
136 __u16 lastopt;
137 __u16 nhoff;
138 __u16 flags;
139 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
140 __u16 dsthao;
141 #endif
142 __u16 frag_max_size;
143 __u16 srhoff;
144
145 #define IP6SKB_XFRM_TRANSFORMED 1
146 #define IP6SKB_FORWARDED 2
147 #define IP6SKB_REROUTED 4
148 #define IP6SKB_ROUTERALERT 8
149 #define IP6SKB_FRAGMENTED 16
150 #define IP6SKB_HOPBYHOP 32
151 #define IP6SKB_L3SLAVE 64
152 #define IP6SKB_JUMBOGRAM 128
153 #define IP6SKB_SEG6 256
154 };
155
156 #if defined(CONFIG_NET_L3_MASTER_DEV)
ipv6_l3mdev_skb(__u16 flags)157 static inline bool ipv6_l3mdev_skb(__u16 flags)
158 {
159 return flags & IP6SKB_L3SLAVE;
160 }
161 #else
ipv6_l3mdev_skb(__u16 flags)162 static inline bool ipv6_l3mdev_skb(__u16 flags)
163 {
164 return false;
165 }
166 #endif
167
168 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
169 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
170
inet6_iif(const struct sk_buff * skb)171 static inline int inet6_iif(const struct sk_buff *skb)
172 {
173 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
174
175 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
176 }
177
inet6_is_jumbogram(const struct sk_buff * skb)178 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
179 {
180 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
181 }
182
183 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_sdif(const struct sk_buff * skb)184 static inline int inet6_sdif(const struct sk_buff *skb)
185 {
186 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
187 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
188 return IP6CB(skb)->iif;
189 #endif
190 return 0;
191 }
192
193 struct tcp6_request_sock {
194 struct tcp_request_sock tcp6rsk_tcp;
195 };
196
197 struct ipv6_mc_socklist;
198 struct ipv6_ac_socklist;
199 struct ipv6_fl_socklist;
200
201 struct inet6_cork {
202 struct ipv6_txoptions *opt;
203 u8 hop_limit;
204 u8 tclass;
205 };
206
207 /**
208 * struct ipv6_pinfo - ipv6 private area
209 *
210 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
211 * this _must_ be the last member, so that inet6_sk_generic
212 * is able to calculate its offset from the base struct sock
213 * by using the struct proto->slab_obj_size member. -acme
214 */
215 struct ipv6_pinfo {
216 struct in6_addr saddr;
217 struct in6_pktinfo sticky_pktinfo;
218 const struct in6_addr *daddr_cache;
219 #ifdef CONFIG_IPV6_SUBTREES
220 const struct in6_addr *saddr_cache;
221 #endif
222
223 __be32 flow_label;
224 __u32 frag_size;
225
226 /*
227 * Packed in 16bits.
228 * Omit one shift by putting the signed field at MSB.
229 */
230 #if defined(__BIG_ENDIAN_BITFIELD)
231 __s16 hop_limit:9;
232 __u16 __unused_1:7;
233 #else
234 __u16 __unused_1:7;
235 __s16 hop_limit:9;
236 #endif
237
238 #if defined(__BIG_ENDIAN_BITFIELD)
239 /* Packed in 16bits. */
240 __s16 mcast_hops:9;
241 __u16 __unused_2:6,
242 mc_loop:1;
243 #else
244 __u16 mc_loop:1,
245 __unused_2:6;
246 __s16 mcast_hops:9;
247 #endif
248 int ucast_oif;
249 int mcast_oif;
250
251 /* pktoption flags */
252 union {
253 struct {
254 __u16 srcrt:1,
255 osrcrt:1,
256 rxinfo:1,
257 rxoinfo:1,
258 rxhlim:1,
259 rxohlim:1,
260 hopopts:1,
261 ohopopts:1,
262 dstopts:1,
263 odstopts:1,
264 rxflow:1,
265 rxtclass:1,
266 rxpmtu:1,
267 rxorigdstaddr:1,
268 recvfragsize:1;
269 /* 1 bits hole */
270 } bits;
271 __u16 all;
272 } rxopt;
273
274 /* sockopt flags */
275 __u16 recverr:1,
276 sndflow:1,
277 repflow:1,
278 pmtudisc:3,
279 padding:1, /* 1 bit hole */
280 srcprefs:3, /* 001: prefer temporary address
281 * 010: prefer public address
282 * 100: prefer care-of address
283 */
284 dontfrag:1,
285 autoflowlabel:1,
286 autoflowlabel_set:1,
287 mc_all:1,
288 recverr_rfc4884:1,
289 rtalert_isolate:1;
290 __u8 min_hopcount;
291 __u8 tclass;
292 __be32 rcv_flowinfo;
293
294 __u32 dst_cookie;
295
296 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
297 struct ipv6_ac_socklist *ipv6_ac_list;
298 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
299
300 struct ipv6_txoptions __rcu *opt;
301 struct sk_buff *pktoptions;
302 struct sk_buff *rxpmtu;
303 struct inet6_cork cork;
304 };
305
306 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
307 struct raw6_sock {
308 /* inet_sock has to be the first member of raw6_sock */
309 struct inet_sock inet;
310 __u32 checksum; /* perform checksum */
311 __u32 offset; /* checksum offset */
312 struct icmp6_filter filter;
313 __u32 ip6mr_table;
314 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
315 struct ipv6_pinfo inet6;
316 };
317
318 struct udp6_sock {
319 struct udp_sock udp;
320 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
321 struct ipv6_pinfo inet6;
322 };
323
324 struct tcp6_sock {
325 struct tcp_sock tcp;
326 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
327 struct ipv6_pinfo inet6;
328 };
329
330 extern int inet6_sk_rebuild_header(struct sock *sk);
331
332 struct tcp6_timewait_sock {
333 struct tcp_timewait_sock tcp6tw_tcp;
334 };
335
336 #if IS_ENABLED(CONFIG_IPV6)
337 bool ipv6_mod_enabled(void);
338
inet6_sk(const struct sock * __sk)339 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
340 {
341 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
342 }
343
raw6_sk(const struct sock * sk)344 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
345 {
346 return (struct raw6_sock *)sk;
347 }
348
349 #define __ipv6_only_sock(sk) (sk->sk_ipv6only)
350 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
351 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
352 inet6_sk(sk)->rxopt.bits.rxinfo)
353
inet6_rcv_saddr(const struct sock * sk)354 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
355 {
356 if (sk->sk_family == AF_INET6)
357 return &sk->sk_v6_rcv_saddr;
358 return NULL;
359 }
360
inet_v6_ipv6only(const struct sock * sk)361 static inline int inet_v6_ipv6only(const struct sock *sk)
362 {
363 /* ipv6only field is at same position for timewait and other sockets */
364 return ipv6_only_sock(sk);
365 }
366 #else
367 #define __ipv6_only_sock(sk) 0
368 #define ipv6_only_sock(sk) 0
369 #define ipv6_sk_rxinfo(sk) 0
370
ipv6_mod_enabled(void)371 static inline bool ipv6_mod_enabled(void)
372 {
373 return false;
374 }
375
inet6_sk(const struct sock * __sk)376 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
377 {
378 return NULL;
379 }
380
381 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)382 inet6_rsk(const struct request_sock *rsk)
383 {
384 return NULL;
385 }
386
raw6_sk(const struct sock * sk)387 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
388 {
389 return NULL;
390 }
391
392 #define inet6_rcv_saddr(__sk) NULL
393 #define tcp_twsk_ipv6only(__sk) 0
394 #define inet_v6_ipv6only(__sk) 0
395 #endif /* IS_ENABLED(CONFIG_IPV6) */
396 #endif /* _IPV6_H */
397