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_min_hop_limit;
33 __s32 accept_ra_pinfo;
34 #ifdef CONFIG_IPV6_ROUTER_PREF
35 __s32 accept_ra_rtr_pref;
36 __s32 rtr_probe_interval;
37 #ifdef CONFIG_IPV6_ROUTE_INFO
38 __s32 accept_ra_rt_info_max_plen;
39 #endif
40 #endif
41 __s32 proxy_ndp;
42 __s32 accept_source_route;
43 __s32 accept_ra_from_local;
44 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
45 __s32 optimistic_dad;
46 __s32 use_optimistic;
47 #endif
48 #ifdef CONFIG_IPV6_MROUTE
49 __s32 mc_forwarding;
50 #endif
51 __s32 disable_ipv6;
52 __s32 accept_dad;
53 __s32 force_tllao;
54 __s32 ndisc_notify;
55 __s32 suppress_frag_ndisc;
56 __s32 accept_ra_mtu;
57 struct ipv6_stable_secret {
58 bool initialized;
59 struct in6_addr secret;
60 } stable_secret;
61 void *sysctl;
62 };
63
64 struct ipv6_params {
65 __s32 disable_ipv6;
66 __s32 autoconf;
67 };
68 extern struct ipv6_params ipv6_defaults;
69 #include <linux/icmpv6.h>
70 #include <linux/tcp.h>
71 #include <linux/udp.h>
72
73 #include <net/inet_sock.h>
74
ipv6_hdr(const struct sk_buff * skb)75 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
76 {
77 return (struct ipv6hdr *)skb_network_header(skb);
78 }
79
inner_ipv6_hdr(const struct sk_buff * skb)80 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
81 {
82 return (struct ipv6hdr *)skb_inner_network_header(skb);
83 }
84
ipipv6_hdr(const struct sk_buff * skb)85 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
86 {
87 return (struct ipv6hdr *)skb_transport_header(skb);
88 }
89
90 /*
91 This structure contains results of exthdrs parsing
92 as offsets from skb->nh.
93 */
94
95 struct inet6_skb_parm {
96 int iif;
97 __be16 ra;
98 __u16 hop;
99 __u16 dst0;
100 __u16 srcrt;
101 __u16 dst1;
102 __u16 lastopt;
103 __u16 nhoff;
104 __u16 flags;
105 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
106 __u16 dsthao;
107 #endif
108 __u16 frag_max_size;
109
110 #define IP6SKB_XFRM_TRANSFORMED 1
111 #define IP6SKB_FORWARDED 2
112 #define IP6SKB_REROUTED 4
113 #define IP6SKB_ROUTERALERT 8
114 #define IP6SKB_FRAGMENTED 16
115 };
116
117 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
118 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
119
inet6_iif(const struct sk_buff * skb)120 static inline int inet6_iif(const struct sk_buff *skb)
121 {
122 return IP6CB(skb)->iif;
123 }
124
125 struct tcp6_request_sock {
126 struct tcp_request_sock tcp6rsk_tcp;
127 };
128
129 struct ipv6_mc_socklist;
130 struct ipv6_ac_socklist;
131 struct ipv6_fl_socklist;
132
133 struct inet6_cork {
134 struct ipv6_txoptions *opt;
135 u8 hop_limit;
136 u8 tclass;
137 };
138
139 /**
140 * struct ipv6_pinfo - ipv6 private area
141 *
142 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
143 * this _must_ be the last member, so that inet6_sk_generic
144 * is able to calculate its offset from the base struct sock
145 * by using the struct proto->slab_obj_size member. -acme
146 */
147 struct ipv6_pinfo {
148 struct in6_addr saddr;
149 struct in6_pktinfo sticky_pktinfo;
150 const struct in6_addr *daddr_cache;
151 #ifdef CONFIG_IPV6_SUBTREES
152 const struct in6_addr *saddr_cache;
153 #endif
154
155 __be32 flow_label;
156 __u32 frag_size;
157
158 /*
159 * Packed in 16bits.
160 * Omit one shift by by putting the signed field at MSB.
161 */
162 #if defined(__BIG_ENDIAN_BITFIELD)
163 __s16 hop_limit:9;
164 __u16 __unused_1:7;
165 #else
166 __u16 __unused_1:7;
167 __s16 hop_limit:9;
168 #endif
169
170 #if defined(__BIG_ENDIAN_BITFIELD)
171 /* Packed in 16bits. */
172 __s16 mcast_hops:9;
173 __u16 __unused_2:6,
174 mc_loop:1;
175 #else
176 __u16 mc_loop:1,
177 __unused_2:6;
178 __s16 mcast_hops:9;
179 #endif
180 int ucast_oif;
181 int mcast_oif;
182
183 /* pktoption flags */
184 union {
185 struct {
186 __u16 srcrt:1,
187 osrcrt:1,
188 rxinfo:1,
189 rxoinfo:1,
190 rxhlim:1,
191 rxohlim:1,
192 hopopts:1,
193 ohopopts:1,
194 dstopts:1,
195 odstopts:1,
196 rxflow:1,
197 rxtclass:1,
198 rxpmtu:1,
199 rxorigdstaddr:1;
200 /* 2 bits hole */
201 } bits;
202 __u16 all;
203 } rxopt;
204
205 /* sockopt flags */
206 __u16 recverr:1,
207 sndflow:1,
208 repflow:1,
209 pmtudisc:3,
210 padding:1, /* 1 bit hole */
211 srcprefs:3, /* 001: prefer temporary address
212 * 010: prefer public address
213 * 100: prefer care-of address
214 */
215 dontfrag:1,
216 autoflowlabel:1;
217 __u8 min_hopcount;
218 __u8 tclass;
219 __be32 rcv_flowinfo;
220
221 __u32 dst_cookie;
222 __u32 rx_dst_cookie;
223
224 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
225 struct ipv6_ac_socklist *ipv6_ac_list;
226 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
227
228 struct ipv6_txoptions __rcu *opt;
229 struct sk_buff *pktoptions;
230 struct sk_buff *rxpmtu;
231 struct inet6_cork cork;
232 };
233
234 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
235 struct raw6_sock {
236 /* inet_sock has to be the first member of raw6_sock */
237 struct inet_sock inet;
238 __u32 checksum; /* perform checksum */
239 __u32 offset; /* checksum offset */
240 struct icmp6_filter filter;
241 __u32 ip6mr_table;
242 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
243 struct ipv6_pinfo inet6;
244 };
245
246 struct udp6_sock {
247 struct udp_sock udp;
248 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
249 struct ipv6_pinfo inet6;
250 };
251
252 struct tcp6_sock {
253 struct tcp_sock tcp;
254 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
255 struct ipv6_pinfo inet6;
256 };
257
258 extern int inet6_sk_rebuild_header(struct sock *sk);
259
260 struct tcp6_timewait_sock {
261 struct tcp_timewait_sock tcp6tw_tcp;
262 };
263
264 #if IS_ENABLED(CONFIG_IPV6)
inet6_sk(const struct sock * __sk)265 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
266 {
267 return inet_sk(__sk)->pinet6;
268 }
269
raw6_sk(const struct sock * sk)270 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
271 {
272 return (struct raw6_sock *)sk;
273 }
274
inet_sk_copy_descendant(struct sock * sk_to,const struct sock * sk_from)275 static inline void inet_sk_copy_descendant(struct sock *sk_to,
276 const struct sock *sk_from)
277 {
278 int ancestor_size = sizeof(struct inet_sock);
279
280 if (sk_from->sk_family == PF_INET6)
281 ancestor_size += sizeof(struct ipv6_pinfo);
282
283 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
284 }
285
286 #define __ipv6_only_sock(sk) (sk->sk_ipv6only)
287 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
288 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
289 inet6_sk(sk)->rxopt.bits.rxinfo)
290
inet6_rcv_saddr(const struct sock * sk)291 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
292 {
293 if (sk->sk_family == AF_INET6)
294 return &sk->sk_v6_rcv_saddr;
295 return NULL;
296 }
297
inet_v6_ipv6only(const struct sock * sk)298 static inline int inet_v6_ipv6only(const struct sock *sk)
299 {
300 /* ipv6only field is at same position for timewait and other sockets */
301 return ipv6_only_sock(sk);
302 }
303 #else
304 #define __ipv6_only_sock(sk) 0
305 #define ipv6_only_sock(sk) 0
306 #define ipv6_sk_rxinfo(sk) 0
307
inet6_sk(const struct sock * __sk)308 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
309 {
310 return NULL;
311 }
312
313 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)314 inet6_rsk(const struct request_sock *rsk)
315 {
316 return NULL;
317 }
318
raw6_sk(const struct sock * sk)319 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
320 {
321 return NULL;
322 }
323
324 #define inet6_rcv_saddr(__sk) NULL
325 #define tcp_twsk_ipv6only(__sk) 0
326 #define inet_v6_ipv6only(__sk) 0
327 #endif /* IS_ENABLED(CONFIG_IPV6) */
328 #endif /* _IPV6_H */
329