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