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 __s32 ignore_routes_with_linkdown;
35 #ifdef CONFIG_IPV6_ROUTER_PREF
36 __s32 accept_ra_rtr_pref;
37 __s32 rtr_probe_interval;
38 #ifdef CONFIG_IPV6_ROUTE_INFO
39 __s32 accept_ra_rt_info_max_plen;
40 #endif
41 #endif
42 __s32 proxy_ndp;
43 __s32 accept_source_route;
44 __s32 accept_ra_from_local;
45 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
46 __s32 optimistic_dad;
47 __s32 use_optimistic;
48 #endif
49 #ifdef CONFIG_IPV6_MROUTE
50 __s32 mc_forwarding;
51 #endif
52 __s32 disable_ipv6;
53 __s32 accept_dad;
54 __s32 force_tllao;
55 __s32 ndisc_notify;
56 __s32 suppress_frag_ndisc;
57 __s32 accept_ra_mtu;
58 struct ipv6_stable_secret {
59 bool initialized;
60 struct in6_addr secret;
61 } stable_secret;
62 __s32 use_oif_addrs_only;
63 void *sysctl;
64 };
65
66 struct ipv6_params {
67 __s32 disable_ipv6;
68 __s32 autoconf;
69 };
70 extern struct ipv6_params ipv6_defaults;
71 #include <linux/icmpv6.h>
72 #include <linux/tcp.h>
73 #include <linux/udp.h>
74
75 #include <net/inet_sock.h>
76
ipv6_hdr(const struct sk_buff * skb)77 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
78 {
79 return (struct ipv6hdr *)skb_network_header(skb);
80 }
81
inner_ipv6_hdr(const struct sk_buff * skb)82 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
83 {
84 return (struct ipv6hdr *)skb_inner_network_header(skb);
85 }
86
ipipv6_hdr(const struct sk_buff * skb)87 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
88 {
89 return (struct ipv6hdr *)skb_transport_header(skb);
90 }
91
92 /*
93 This structure contains results of exthdrs parsing
94 as offsets from skb->nh.
95 */
96
97 struct inet6_skb_parm {
98 int iif;
99 __be16 ra;
100 __u16 dst0;
101 __u16 srcrt;
102 __u16 dst1;
103 __u16 lastopt;
104 __u16 nhoff;
105 __u16 flags;
106 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
107 __u16 dsthao;
108 #endif
109 __u16 frag_max_size;
110
111 #define IP6SKB_XFRM_TRANSFORMED 1
112 #define IP6SKB_FORWARDED 2
113 #define IP6SKB_REROUTED 4
114 #define IP6SKB_ROUTERALERT 8
115 #define IP6SKB_FRAGMENTED 16
116 #define IP6SKB_HOPBYHOP 32
117 };
118
119 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
120 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
121
inet6_iif(const struct sk_buff * skb)122 static inline int inet6_iif(const struct sk_buff *skb)
123 {
124 return IP6CB(skb)->iif;
125 }
126
127 struct tcp6_request_sock {
128 struct tcp_request_sock tcp6rsk_tcp;
129 };
130
131 struct ipv6_mc_socklist;
132 struct ipv6_ac_socklist;
133 struct ipv6_fl_socklist;
134
135 struct inet6_cork {
136 struct ipv6_txoptions *opt;
137 u8 hop_limit;
138 u8 tclass;
139 };
140
141 /**
142 * struct ipv6_pinfo - ipv6 private area
143 *
144 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
145 * this _must_ be the last member, so that inet6_sk_generic
146 * is able to calculate its offset from the base struct sock
147 * by using the struct proto->slab_obj_size member. -acme
148 */
149 struct ipv6_pinfo {
150 struct in6_addr saddr;
151 struct in6_pktinfo sticky_pktinfo;
152 const struct in6_addr *daddr_cache;
153 #ifdef CONFIG_IPV6_SUBTREES
154 const struct in6_addr *saddr_cache;
155 #endif
156
157 __be32 flow_label;
158 __u32 frag_size;
159
160 /*
161 * Packed in 16bits.
162 * Omit one shift by by putting the signed field at MSB.
163 */
164 #if defined(__BIG_ENDIAN_BITFIELD)
165 __s16 hop_limit:9;
166 __u16 __unused_1:7;
167 #else
168 __u16 __unused_1:7;
169 __s16 hop_limit:9;
170 #endif
171
172 #if defined(__BIG_ENDIAN_BITFIELD)
173 /* Packed in 16bits. */
174 __s16 mcast_hops:9;
175 __u16 __unused_2:6,
176 mc_loop:1;
177 #else
178 __u16 mc_loop:1,
179 __unused_2:6;
180 __s16 mcast_hops:9;
181 #endif
182 int ucast_oif;
183 int mcast_oif;
184
185 /* pktoption flags */
186 union {
187 struct {
188 __u16 srcrt:1,
189 osrcrt:1,
190 rxinfo:1,
191 rxoinfo:1,
192 rxhlim:1,
193 rxohlim:1,
194 hopopts:1,
195 ohopopts:1,
196 dstopts:1,
197 odstopts:1,
198 rxflow:1,
199 rxtclass:1,
200 rxpmtu:1,
201 rxorigdstaddr:1;
202 /* 2 bits hole */
203 } bits;
204 __u16 all;
205 } rxopt;
206
207 /* sockopt flags */
208 __u16 recverr:1,
209 sndflow:1,
210 repflow:1,
211 pmtudisc:3,
212 padding:1, /* 1 bit hole */
213 srcprefs:3, /* 001: prefer temporary address
214 * 010: prefer public address
215 * 100: prefer care-of address
216 */
217 dontfrag:1,
218 autoflowlabel:1;
219 __u8 min_hopcount;
220 __u8 tclass;
221 __be32 rcv_flowinfo;
222
223 __u32 dst_cookie;
224 __u32 rx_dst_cookie;
225
226 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
227 struct ipv6_ac_socklist *ipv6_ac_list;
228 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
229
230 struct ipv6_txoptions __rcu *opt;
231 struct sk_buff *pktoptions;
232 struct sk_buff *rxpmtu;
233 struct inet6_cork cork;
234 };
235
236 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
237 struct raw6_sock {
238 /* inet_sock has to be the first member of raw6_sock */
239 struct inet_sock inet;
240 __u32 checksum; /* perform checksum */
241 __u32 offset; /* checksum offset */
242 struct icmp6_filter filter;
243 __u32 ip6mr_table;
244 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
245 struct ipv6_pinfo inet6;
246 };
247
248 struct udp6_sock {
249 struct udp_sock udp;
250 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
251 struct ipv6_pinfo inet6;
252 };
253
254 struct tcp6_sock {
255 struct tcp_sock tcp;
256 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
257 struct ipv6_pinfo inet6;
258 };
259
260 extern int inet6_sk_rebuild_header(struct sock *sk);
261
262 struct tcp6_timewait_sock {
263 struct tcp_timewait_sock tcp6tw_tcp;
264 };
265
266 #if IS_ENABLED(CONFIG_IPV6)
inet6_sk(const struct sock * __sk)267 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
268 {
269 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
270 }
271
raw6_sk(const struct sock * sk)272 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
273 {
274 return (struct raw6_sock *)sk;
275 }
276
inet_sk_copy_descendant(struct sock * sk_to,const struct sock * sk_from)277 static inline void inet_sk_copy_descendant(struct sock *sk_to,
278 const struct sock *sk_from)
279 {
280 int ancestor_size = sizeof(struct inet_sock);
281
282 if (sk_from->sk_family == PF_INET6)
283 ancestor_size += sizeof(struct ipv6_pinfo);
284
285 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
286 }
287
288 #define __ipv6_only_sock(sk) (sk->sk_ipv6only)
289 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
290 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
291 inet6_sk(sk)->rxopt.bits.rxinfo)
292
inet6_rcv_saddr(const struct sock * sk)293 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
294 {
295 if (sk->sk_family == AF_INET6)
296 return &sk->sk_v6_rcv_saddr;
297 return NULL;
298 }
299
inet_v6_ipv6only(const struct sock * sk)300 static inline int inet_v6_ipv6only(const struct sock *sk)
301 {
302 /* ipv6only field is at same position for timewait and other sockets */
303 return ipv6_only_sock(sk);
304 }
305 #else
306 #define __ipv6_only_sock(sk) 0
307 #define ipv6_only_sock(sk) 0
308 #define ipv6_sk_rxinfo(sk) 0
309
inet6_sk(const struct sock * __sk)310 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
311 {
312 return NULL;
313 }
314
315 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)316 inet6_rsk(const struct request_sock *rsk)
317 {
318 return NULL;
319 }
320
raw6_sk(const struct sock * sk)321 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
322 {
323 return NULL;
324 }
325
326 #define inet6_rcv_saddr(__sk) NULL
327 #define tcp_twsk_ipv6only(__sk) 0
328 #define inet_v6_ipv6only(__sk) 0
329 #endif /* IS_ENABLED(CONFIG_IPV6) */
330 #endif /* _IPV6_H */
331