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