1 #ifndef _IPV6_H
2 #define _IPV6_H
3
4 #include <uapi/linux/ipv6.h>
5
6 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
7 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
8 /*
9 * This structure contains configuration options per IPv6 link.
10 */
11 struct ipv6_devconf {
12 __s32 forwarding;
13 __s32 hop_limit;
14 __s32 mtu6;
15 __s32 accept_ra;
16 __s32 accept_redirects;
17 __s32 autoconf;
18 __s32 dad_transmits;
19 __s32 rtr_solicits;
20 __s32 rtr_solicit_interval;
21 __s32 rtr_solicit_delay;
22 __s32 force_mld_version;
23 __s32 mldv1_unsolicited_report_interval;
24 __s32 mldv2_unsolicited_report_interval;
25 __s32 use_tempaddr;
26 __s32 temp_valid_lft;
27 __s32 temp_prefered_lft;
28 __s32 regen_max_retry;
29 __s32 max_desync_factor;
30 __s32 max_addresses;
31 __s32 accept_ra_defrtr;
32 __s32 accept_ra_pinfo;
33 #ifdef CONFIG_IPV6_ROUTER_PREF
34 __s32 accept_ra_rtr_pref;
35 __s32 rtr_probe_interval;
36 #ifdef CONFIG_IPV6_ROUTE_INFO
37 __s32 accept_ra_rt_info_max_plen;
38 #endif
39 #endif
40 __s32 proxy_ndp;
41 __s32 accept_source_route;
42 __s32 accept_ra_from_local;
43 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
44 __s32 optimistic_dad;
45 __s32 use_optimistic;
46 #endif
47 #ifdef CONFIG_IPV6_MROUTE
48 __s32 mc_forwarding;
49 #endif
50 __s32 disable_ipv6;
51 __s32 accept_dad;
52 __s32 force_tllao;
53 __s32 ndisc_notify;
54 __s32 suppress_frag_ndisc;
55 __s32 accept_ra_mtu;
56 void *sysctl;
57 };
58
59 struct ipv6_params {
60 __s32 disable_ipv6;
61 __s32 autoconf;
62 };
63 extern struct ipv6_params ipv6_defaults;
64 #include <linux/icmpv6.h>
65 #include <linux/tcp.h>
66 #include <linux/udp.h>
67
68 #include <net/inet_sock.h>
69
70 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
71 {
72 return (struct ipv6hdr *)skb_network_header(skb);
73 }
74
75 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
76 {
77 return (struct ipv6hdr *)skb_inner_network_header(skb);
78 }
79
80 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
81 {
82 return (struct ipv6hdr *)skb_transport_header(skb);
83 }
84
85 /*
86 This structure contains results of exthdrs parsing
87 as offsets from skb->nh.
88 */
89
90 struct inet6_skb_parm {
91 int iif;
92 __be16 ra;
93 __u16 hop;
94 __u16 dst0;
95 __u16 srcrt;
96 __u16 dst1;
97 __u16 lastopt;
98 __u16 nhoff;
99 __u16 flags;
100 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
101 __u16 dsthao;
102 #endif
103 __u16 frag_max_size;
104
105 #define IP6SKB_XFRM_TRANSFORMED 1
106 #define IP6SKB_FORWARDED 2
107 #define IP6SKB_REROUTED 4
108 #define IP6SKB_ROUTERALERT 8
109 #define IP6SKB_FRAGMENTED 16
110 };
111
112 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
113 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
114
115 static inline int inet6_iif(const struct sk_buff *skb)
116 {
117 return IP6CB(skb)->iif;
118 }
119
120 struct tcp6_request_sock {
121 struct tcp_request_sock tcp6rsk_tcp;
122 };
123
124 struct ipv6_mc_socklist;
125 struct ipv6_ac_socklist;
126 struct ipv6_fl_socklist;
127
128 struct inet6_cork {
129 struct ipv6_txoptions *opt;
130 u8 hop_limit;
131 u8 tclass;
132 };
133
134 /**
135 * struct ipv6_pinfo - ipv6 private area
136 *
137 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
138 * this _must_ be the last member, so that inet6_sk_generic
139 * is able to calculate its offset from the base struct sock
140 * by using the struct proto->slab_obj_size member. -acme
141 */
142 struct ipv6_pinfo {
143 struct in6_addr saddr;
144 struct in6_pktinfo sticky_pktinfo;
145 const struct in6_addr *daddr_cache;
146 #ifdef CONFIG_IPV6_SUBTREES
147 const struct in6_addr *saddr_cache;
148 #endif
149
150 __be32 flow_label;
151 __u32 frag_size;
152
153 /*
154 * Packed in 16bits.
155 * Omit one shift by by putting the signed field at MSB.
156 */
157 #if defined(__BIG_ENDIAN_BITFIELD)
158 __s16 hop_limit:9;
159 __u16 __unused_1:7;
160 #else
161 __u16 __unused_1:7;
162 __s16 hop_limit:9;
163 #endif
164
165 #if defined(__BIG_ENDIAN_BITFIELD)
166 /* Packed in 16bits. */
167 __s16 mcast_hops:9;
168 __u16 __unused_2:6,
169 mc_loop:1;
170 #else
171 __u16 mc_loop:1,
172 __unused_2:6;
173 __s16 mcast_hops:9;
174 #endif
175 int ucast_oif;
176 int mcast_oif;
177
178 /* pktoption flags */
179 union {
180 struct {
181 __u16 srcrt:1,
182 osrcrt:1,
183 rxinfo:1,
184 rxoinfo:1,
185 rxhlim:1,
186 rxohlim:1,
187 hopopts:1,
188 ohopopts:1,
189 dstopts:1,
190 odstopts:1,
191 rxflow:1,
192 rxtclass:1,
193 rxpmtu:1,
194 rxorigdstaddr:1;
195 /* 2 bits hole */
196 } bits;
197 __u16 all;
198 } rxopt;
199
200 /* sockopt flags */
201 __u16 recverr:1,
202 sndflow:1,
203 repflow:1,
204 pmtudisc:3,
205 padding:1, /* 1 bit hole */
206 srcprefs:3, /* 001: prefer temporary address
207 * 010: prefer public address
208 * 100: prefer care-of address
209 */
210 dontfrag:1,
211 autoflowlabel:1;
212 __u8 min_hopcount;
213 __u8 tclass;
214 __be32 rcv_flowinfo;
215
216 __u32 dst_cookie;
217 __u32 rx_dst_cookie;
218
219 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
220 struct ipv6_ac_socklist *ipv6_ac_list;
221 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
222
223 struct ipv6_txoptions *opt;
224 struct sk_buff *pktoptions;
225 struct sk_buff *rxpmtu;
226 struct inet6_cork cork;
227 };
228
229 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
230 struct raw6_sock {
231 /* inet_sock has to be the first member of raw6_sock */
232 struct inet_sock inet;
233 __u32 checksum; /* perform checksum */
234 __u32 offset; /* checksum offset */
235 struct icmp6_filter filter;
236 __u32 ip6mr_table;
237 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
238 struct ipv6_pinfo inet6;
239 };
240
241 struct udp6_sock {
242 struct udp_sock udp;
243 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
244 struct ipv6_pinfo inet6;
245 };
246
247 struct tcp6_sock {
248 struct tcp_sock tcp;
249 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
250 struct ipv6_pinfo inet6;
251 };
252
253 extern int inet6_sk_rebuild_header(struct sock *sk);
254
255 struct tcp6_timewait_sock {
256 struct tcp_timewait_sock tcp6tw_tcp;
257 };
258
259 #if IS_ENABLED(CONFIG_IPV6)
260 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
261 {
262 return inet_sk(__sk)->pinet6;
263 }
264
265 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
266 {
267 return (struct raw6_sock *)sk;
268 }
269
270 static inline void inet_sk_copy_descendant(struct sock *sk_to,
271 const struct sock *sk_from)
272 {
273 int ancestor_size = sizeof(struct inet_sock);
274
275 if (sk_from->sk_family == PF_INET6)
276 ancestor_size += sizeof(struct ipv6_pinfo);
277
278 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
279 }
280
281 #define __ipv6_only_sock(sk) (sk->sk_ipv6only)
282 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
283 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
284 inet6_sk(sk)->rxopt.bits.rxinfo)
285
286 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
287 {
288 if (sk->sk_family == AF_INET6)
289 return &sk->sk_v6_rcv_saddr;
290 return NULL;
291 }
292
293 static inline int inet_v6_ipv6only(const struct sock *sk)
294 {
295 /* ipv6only field is at same position for timewait and other sockets */
296 return ipv6_only_sock(sk);
297 }
298 #else
299 #define __ipv6_only_sock(sk) 0
300 #define ipv6_only_sock(sk) 0
301 #define ipv6_sk_rxinfo(sk) 0
302
303 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
304 {
305 return NULL;
306 }
307
308 static inline struct inet6_request_sock *
309 inet6_rsk(const struct request_sock *rsk)
310 {
311 return NULL;
312 }
313
314 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
315 {
316 return NULL;
317 }
318
319 #define inet6_rcv_saddr(__sk) NULL
320 #define tcp_twsk_ipv6only(__sk) 0
321 #define inet_v6_ipv6only(__sk) 0
322 #endif /* IS_ENABLED(CONFIG_IPV6) */
323 #endif /* _IPV6_H */
324
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