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 __s32 accept_untracked_na;
67 struct ipv6_stable_secret {
68 bool initialized;
69 struct in6_addr secret;
70 } stable_secret;
71 __s32 use_oif_addrs_only;
72 __s32 keep_addr_on_down;
73 __s32 seg6_enabled;
74 #ifdef CONFIG_IPV6_SEG6_HMAC
75 __s32 seg6_require_hmac;
76 #endif
77 __u32 enhanced_dad;
78 __u32 addr_gen_mode;
79 __s32 disable_policy;
80 __s32 ndisc_tclass;
81 __s32 rpl_seg_enabled;
82 __u32 ioam6_id;
83 __u32 ioam6_id_wide;
84 __u8 ioam6_enabled;
85 __u8 ndisc_evict_nocarrier;
86
87 struct ctl_table_header *sysctl_header;
88
89 ANDROID_KABI_USE(1, struct { __s32 accept_ra_min_lft; u32 padding; });
90
91 ANDROID_KABI_RESERVE(2);
92 ANDROID_KABI_RESERVE(3);
93 ANDROID_KABI_RESERVE(4);
94 };
95
96 struct ipv6_params {
97 __s32 disable_ipv6;
98 __s32 autoconf;
99 };
100 extern struct ipv6_params ipv6_defaults;
101 #include <linux/tcp.h>
102 #include <linux/udp.h>
103
104 #include <net/inet_sock.h>
105
ipv6_hdr(const struct sk_buff * skb)106 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
107 {
108 return (struct ipv6hdr *)skb_network_header(skb);
109 }
110
inner_ipv6_hdr(const struct sk_buff * skb)111 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
112 {
113 return (struct ipv6hdr *)skb_inner_network_header(skb);
114 }
115
ipipv6_hdr(const struct sk_buff * skb)116 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
117 {
118 return (struct ipv6hdr *)skb_transport_header(skb);
119 }
120
ipv6_transport_len(const struct sk_buff * skb)121 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
122 {
123 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
124 skb_network_header_len(skb);
125 }
126
127 /*
128 This structure contains results of exthdrs parsing
129 as offsets from skb->nh.
130 */
131
132 struct inet6_skb_parm {
133 int iif;
134 __be16 ra;
135 __u16 dst0;
136 __u16 srcrt;
137 __u16 dst1;
138 __u16 lastopt;
139 __u16 nhoff;
140 __u16 flags;
141 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
142 __u16 dsthao;
143 #endif
144 __u16 frag_max_size;
145 __u16 srhoff;
146
147 #define IP6SKB_XFRM_TRANSFORMED 1
148 #define IP6SKB_FORWARDED 2
149 #define IP6SKB_REROUTED 4
150 #define IP6SKB_ROUTERALERT 8
151 #define IP6SKB_FRAGMENTED 16
152 #define IP6SKB_HOPBYHOP 32
153 #define IP6SKB_L3SLAVE 64
154 #define IP6SKB_JUMBOGRAM 128
155 #define IP6SKB_SEG6 256
156 #define IP6SKB_FAKEJUMBO 512
157 #define IP6SKB_MULTIPATH 1024
158 };
159
160 #if defined(CONFIG_NET_L3_MASTER_DEV)
ipv6_l3mdev_skb(__u16 flags)161 static inline bool ipv6_l3mdev_skb(__u16 flags)
162 {
163 return flags & IP6SKB_L3SLAVE;
164 }
165 #else
ipv6_l3mdev_skb(__u16 flags)166 static inline bool ipv6_l3mdev_skb(__u16 flags)
167 {
168 return false;
169 }
170 #endif
171
172 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
173 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
174
inet6_iif(const struct sk_buff * skb)175 static inline int inet6_iif(const struct sk_buff *skb)
176 {
177 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
178
179 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
180 }
181
inet6_is_jumbogram(const struct sk_buff * skb)182 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
183 {
184 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
185 }
186
187 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_sdif(const struct sk_buff * skb)188 static inline int inet6_sdif(const struct sk_buff *skb)
189 {
190 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
191 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
192 return IP6CB(skb)->iif;
193 #endif
194 return 0;
195 }
196
197 struct tcp6_request_sock {
198 struct tcp_request_sock tcp6rsk_tcp;
199 };
200
201 struct ipv6_mc_socklist;
202 struct ipv6_ac_socklist;
203 struct ipv6_fl_socklist;
204
205 struct inet6_cork {
206 struct ipv6_txoptions *opt;
207 u8 hop_limit;
208 u8 tclass;
209 };
210
211 /**
212 * struct ipv6_pinfo - ipv6 private area
213 *
214 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
215 * this _must_ be the last member, so that inet6_sk_generic
216 * is able to calculate its offset from the base struct sock
217 * by using the struct proto->slab_obj_size member. -acme
218 */
219 struct ipv6_pinfo {
220 struct in6_addr saddr;
221 struct in6_pktinfo sticky_pktinfo;
222 const struct in6_addr *daddr_cache;
223 #ifdef CONFIG_IPV6_SUBTREES
224 const struct in6_addr *saddr_cache;
225 #endif
226
227 __be32 flow_label;
228 __u32 frag_size;
229
230 /*
231 * Packed in 16bits.
232 * Omit one shift by putting the signed field at MSB.
233 */
234 #if defined(__BIG_ENDIAN_BITFIELD)
235 __s16 hop_limit:9;
236 __u16 __unused_1:7;
237 #else
238 __u16 __unused_1:7;
239 __s16 hop_limit:9;
240 #endif
241
242 #if defined(__BIG_ENDIAN_BITFIELD)
243 /* Packed in 16bits. */
244 __s16 mcast_hops:9;
245 __u16 __unused_2:6,
246 mc_loop:1;
247 #else
248 __u16 mc_loop:1,
249 __unused_2:6;
250 __s16 mcast_hops:9;
251 #endif
252 int ucast_oif;
253 int mcast_oif;
254
255 /* pktoption flags */
256 union {
257 struct {
258 __u16 srcrt:1,
259 osrcrt:1,
260 rxinfo:1,
261 rxoinfo:1,
262 rxhlim:1,
263 rxohlim:1,
264 hopopts:1,
265 ohopopts:1,
266 dstopts:1,
267 odstopts:1,
268 rxflow:1,
269 rxtclass:1,
270 rxpmtu:1,
271 rxorigdstaddr:1,
272 recvfragsize:1;
273 /* 1 bits hole */
274 } bits;
275 __u16 all;
276 } rxopt;
277
278 /* sockopt flags */
279 __u16 recverr:1,
280 sndflow:1,
281 repflow:1,
282 pmtudisc:3,
283 padding:1, /* 1 bit hole */
284 srcprefs:3, /* 001: prefer temporary address
285 * 010: prefer public address
286 * 100: prefer care-of address
287 */
288 dontfrag:1,
289 autoflowlabel:1,
290 autoflowlabel_set:1,
291 mc_all:1,
292 recverr_rfc4884:1,
293 rtalert_isolate:1;
294 __u8 min_hopcount;
295 __u8 tclass;
296 __be32 rcv_flowinfo;
297
298 __u32 dst_cookie;
299
300 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
301 struct ipv6_ac_socklist *ipv6_ac_list;
302 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
303
304 struct ipv6_txoptions __rcu *opt;
305 struct sk_buff *pktoptions;
306 struct sk_buff *rxpmtu;
307 struct inet6_cork cork;
308 };
309
310 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
311 struct raw6_sock {
312 /* inet_sock has to be the first member of raw6_sock */
313 struct inet_sock inet;
314 __u32 checksum; /* perform checksum */
315 __u32 offset; /* checksum offset */
316 struct icmp6_filter filter;
317 __u32 ip6mr_table;
318 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
319 struct ipv6_pinfo inet6;
320 };
321
322 struct udp6_sock {
323 struct udp_sock udp;
324 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
325 struct ipv6_pinfo inet6;
326 };
327
328 struct tcp6_sock {
329 struct tcp_sock tcp;
330 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
331 struct ipv6_pinfo inet6;
332 };
333
334 extern int inet6_sk_rebuild_header(struct sock *sk);
335
336 struct tcp6_timewait_sock {
337 struct tcp_timewait_sock tcp6tw_tcp;
338 };
339
340 #if IS_ENABLED(CONFIG_IPV6)
341 bool ipv6_mod_enabled(void);
342
inet6_sk(const struct sock * __sk)343 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
344 {
345 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
346 }
347
raw6_sk(const struct sock * sk)348 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
349 {
350 return (struct raw6_sock *)sk;
351 }
352
353 #define ipv6_only_sock(sk) (sk->sk_ipv6only)
354 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
355 inet6_sk(sk)->rxopt.bits.rxinfo)
356
inet6_rcv_saddr(const struct sock * sk)357 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
358 {
359 if (sk->sk_family == AF_INET6)
360 return &sk->sk_v6_rcv_saddr;
361 return NULL;
362 }
363
inet_v6_ipv6only(const struct sock * sk)364 static inline int inet_v6_ipv6only(const struct sock *sk)
365 {
366 /* ipv6only field is at same position for timewait and other sockets */
367 return ipv6_only_sock(sk);
368 }
369 #else
370 #define ipv6_only_sock(sk) 0
371 #define ipv6_sk_rxinfo(sk) 0
372
ipv6_mod_enabled(void)373 static inline bool ipv6_mod_enabled(void)
374 {
375 return false;
376 }
377
inet6_sk(const struct sock * __sk)378 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
379 {
380 return NULL;
381 }
382
raw6_sk(const struct sock * sk)383 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
384 {
385 return NULL;
386 }
387
388 #define inet6_rcv_saddr(__sk) NULL
389 #define inet_v6_ipv6only(__sk) 0
390 #endif /* IS_ENABLED(CONFIG_IPV6) */
391 #endif /* _IPV6_H */
392