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 | |
78 | struct ctl_table_header *; |
79 | }; |
80 | |
81 | struct ipv6_params { |
82 | __s32 disable_ipv6; |
83 | __s32 autoconf; |
84 | }; |
85 | extern struct ipv6_params ipv6_defaults; |
86 | #include <linux/icmpv6.h> |
87 | #include <linux/tcp.h> |
88 | #include <linux/udp.h> |
89 | |
90 | #include <net/inet_sock.h> |
91 | |
92 | static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
93 | { |
94 | return (struct ipv6hdr *)skb_network_header(skb); |
95 | } |
96 | |
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 | |
102 | static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) |
103 | { |
104 | return (struct ipv6hdr *)skb_transport_header(skb); |
105 | } |
106 | |
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) |
143 | static inline bool ipv6_l3mdev_skb(__u16 flags) |
144 | { |
145 | return flags & IP6SKB_L3SLAVE; |
146 | } |
147 | #else |
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 | |
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 | |
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 */ |
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 | /* can not be used in TCP layer after tcp_v6_fill_cb */ |
180 | static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb) |
181 | { |
182 | #if defined(CONFIG_NET_L3_MASTER_DEV) |
183 | if (!net->ipv4.sysctl_tcp_l3mdev_accept && |
184 | skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) |
185 | return true; |
186 | #endif |
187 | return false; |
188 | } |
189 | |
190 | struct tcp6_request_sock { |
191 | struct tcp_request_sock tcp6rsk_tcp; |
192 | }; |
193 | |
194 | struct ipv6_mc_socklist; |
195 | struct ipv6_ac_socklist; |
196 | struct ipv6_fl_socklist; |
197 | |
198 | struct inet6_cork { |
199 | struct ipv6_txoptions *opt; |
200 | u8 hop_limit; |
201 | u8 tclass; |
202 | }; |
203 | |
204 | /** |
205 | * struct ipv6_pinfo - ipv6 private area |
206 | * |
207 | * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) |
208 | * this _must_ be the last member, so that inet6_sk_generic |
209 | * is able to calculate its offset from the base struct sock |
210 | * by using the struct proto->slab_obj_size member. -acme |
211 | */ |
212 | struct ipv6_pinfo { |
213 | struct in6_addr saddr; |
214 | struct in6_pktinfo sticky_pktinfo; |
215 | const struct in6_addr *daddr_cache; |
216 | #ifdef CONFIG_IPV6_SUBTREES |
217 | const struct in6_addr *saddr_cache; |
218 | #endif |
219 | |
220 | __be32 flow_label; |
221 | __u32 frag_size; |
222 | |
223 | /* |
224 | * Packed in 16bits. |
225 | * Omit one shift by by putting the signed field at MSB. |
226 | */ |
227 | #if defined(__BIG_ENDIAN_BITFIELD) |
228 | __s16 hop_limit:9; |
229 | __u16 __unused_1:7; |
230 | #else |
231 | __u16 __unused_1:7; |
232 | __s16 hop_limit:9; |
233 | #endif |
234 | |
235 | #if defined(__BIG_ENDIAN_BITFIELD) |
236 | /* Packed in 16bits. */ |
237 | __s16 mcast_hops:9; |
238 | __u16 __unused_2:6, |
239 | mc_loop:1; |
240 | #else |
241 | __u16 mc_loop:1, |
242 | __unused_2:6; |
243 | __s16 mcast_hops:9; |
244 | #endif |
245 | int ucast_oif; |
246 | int mcast_oif; |
247 | |
248 | /* pktoption flags */ |
249 | union { |
250 | struct { |
251 | __u16 srcrt:1, |
252 | osrcrt:1, |
253 | rxinfo:1, |
254 | rxoinfo:1, |
255 | rxhlim:1, |
256 | rxohlim:1, |
257 | hopopts:1, |
258 | ohopopts:1, |
259 | dstopts:1, |
260 | odstopts:1, |
261 | rxflow:1, |
262 | rxtclass:1, |
263 | rxpmtu:1, |
264 | rxorigdstaddr:1, |
265 | recvfragsize:1; |
266 | /* 1 bits hole */ |
267 | } bits; |
268 | __u16 all; |
269 | } rxopt; |
270 | |
271 | /* sockopt flags */ |
272 | __u16 recverr:1, |
273 | sndflow:1, |
274 | repflow:1, |
275 | pmtudisc:3, |
276 | padding:1, /* 1 bit hole */ |
277 | srcprefs:3, /* 001: prefer temporary address |
278 | * 010: prefer public address |
279 | * 100: prefer care-of address |
280 | */ |
281 | dontfrag:1, |
282 | autoflowlabel:1, |
283 | autoflowlabel_set:1, |
284 | mc_all:1, |
285 | rtalert_isolate:1; |
286 | __u8 min_hopcount; |
287 | __u8 tclass; |
288 | __be32 rcv_flowinfo; |
289 | |
290 | __u32 dst_cookie; |
291 | __u32 rx_dst_cookie; |
292 | |
293 | struct ipv6_mc_socklist __rcu *ipv6_mc_list; |
294 | struct ipv6_ac_socklist *ipv6_ac_list; |
295 | struct ipv6_fl_socklist __rcu *ipv6_fl_list; |
296 | |
297 | struct ipv6_txoptions __rcu *opt; |
298 | struct sk_buff *pktoptions; |
299 | struct sk_buff *rxpmtu; |
300 | struct inet6_cork cork; |
301 | }; |
302 | |
303 | /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ |
304 | struct raw6_sock { |
305 | /* inet_sock has to be the first member of raw6_sock */ |
306 | struct inet_sock inet; |
307 | __u32 checksum; /* perform checksum */ |
308 | __u32 offset; /* checksum offset */ |
309 | struct icmp6_filter filter; |
310 | __u32 ip6mr_table; |
311 | /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ |
312 | struct ipv6_pinfo inet6; |
313 | }; |
314 | |
315 | struct udp6_sock { |
316 | struct udp_sock udp; |
317 | /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ |
318 | struct ipv6_pinfo inet6; |
319 | }; |
320 | |
321 | struct tcp6_sock { |
322 | struct tcp_sock tcp; |
323 | /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ |
324 | struct ipv6_pinfo inet6; |
325 | }; |
326 | |
327 | extern int (struct sock *sk); |
328 | |
329 | struct tcp6_timewait_sock { |
330 | struct tcp_timewait_sock tcp6tw_tcp; |
331 | }; |
332 | |
333 | #if IS_ENABLED(CONFIG_IPV6) |
334 | bool ipv6_mod_enabled(void); |
335 | |
336 | static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) |
337 | { |
338 | return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; |
339 | } |
340 | |
341 | static inline struct raw6_sock *raw6_sk(const struct sock *sk) |
342 | { |
343 | return (struct raw6_sock *)sk; |
344 | } |
345 | |
346 | static inline void inet_sk_copy_descendant(struct sock *sk_to, |
347 | const struct sock *sk_from) |
348 | { |
349 | int ancestor_size = sizeof(struct inet_sock); |
350 | |
351 | if (sk_from->sk_family == PF_INET6) |
352 | ancestor_size += sizeof(struct ipv6_pinfo); |
353 | |
354 | __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); |
355 | } |
356 | |
357 | #define __ipv6_only_sock(sk) (sk->sk_ipv6only) |
358 | #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) |
359 | #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ |
360 | inet6_sk(sk)->rxopt.bits.rxinfo) |
361 | |
362 | static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) |
363 | { |
364 | if (sk->sk_family == AF_INET6) |
365 | return &sk->sk_v6_rcv_saddr; |
366 | return NULL; |
367 | } |
368 | |
369 | static inline int inet_v6_ipv6only(const struct sock *sk) |
370 | { |
371 | /* ipv6only field is at same position for timewait and other sockets */ |
372 | return ipv6_only_sock(sk); |
373 | } |
374 | #else |
375 | #define __ipv6_only_sock(sk) 0 |
376 | #define ipv6_only_sock(sk) 0 |
377 | #define ipv6_sk_rxinfo(sk) 0 |
378 | |
379 | static inline bool ipv6_mod_enabled(void) |
380 | { |
381 | return false; |
382 | } |
383 | |
384 | static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) |
385 | { |
386 | return NULL; |
387 | } |
388 | |
389 | static inline struct inet6_request_sock * |
390 | inet6_rsk(const struct request_sock *rsk) |
391 | { |
392 | return NULL; |
393 | } |
394 | |
395 | static inline struct raw6_sock *raw6_sk(const struct sock *sk) |
396 | { |
397 | return NULL; |
398 | } |
399 | |
400 | #define inet6_rcv_saddr(__sk) NULL |
401 | #define tcp_twsk_ipv6only(__sk) 0 |
402 | #define inet_v6_ipv6only(__sk) 0 |
403 | #endif /* IS_ENABLED(CONFIG_IPV6) */ |
404 | #endif /* _IPV6_H */ |
405 | |