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