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_max_interval;
22 __s32 rtr_solicit_delay;
23 __s32 force_mld_version;
24 __s32 mldv1_unsolicited_report_interval;
25 __s32 mldv2_unsolicited_report_interval;
26 __s32 use_tempaddr;
27 __s32 temp_valid_lft;
28 __s32 temp_prefered_lft;
29 __s32 regen_max_retry;
30 __s32 max_desync_factor;
31 __s32 max_addresses;
32 __s32 accept_ra_defrtr;
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_min_plen;
39 __s32 accept_ra_rt_info_max_plen;
40 #endif
41 #endif
42 __s32 accept_ra_rt_table;
43 __s32 proxy_ndp;
44 __s32 accept_source_route;
45 __s32 accept_ra_from_local;
46 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
47 __s32 optimistic_dad;
48 __s32 use_optimistic;
49 #endif
50 #ifdef CONFIG_IPV6_MROUTE
51 __s32 mc_forwarding;
52 #endif
53 __s32 disable_ipv6;
54 __s32 accept_dad;
55 __s32 force_tllao;
56 __s32 ndisc_notify;
57 __s32 suppress_frag_ndisc;
58 __s32 use_oif_addrs_only;
59 void *sysctl;
60 };
61
62 struct ipv6_params {
63 __s32 disable_ipv6;
64 __s32 autoconf;
65 };
66 extern struct ipv6_params ipv6_defaults;
67 #include <linux/icmpv6.h>
68 #include <linux/tcp.h>
69 #include <linux/udp.h>
70
71 #include <net/inet_sock.h>
72
ipv6_hdr(const struct sk_buff * skb)73 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
74 {
75 return (struct ipv6hdr *)skb_network_header(skb);
76 }
77
inner_ipv6_hdr(const struct sk_buff * skb)78 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
79 {
80 return (struct ipv6hdr *)skb_inner_network_header(skb);
81 }
82
ipipv6_hdr(const struct sk_buff * skb)83 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
84 {
85 return (struct ipv6hdr *)skb_transport_header(skb);
86 }
87
88 /*
89 This structure contains results of exthdrs parsing
90 as offsets from skb->nh.
91 */
92
93 struct inet6_skb_parm {
94 int iif;
95 __be16 ra;
96 __u16 hop;
97 __u16 dst0;
98 __u16 srcrt;
99 __u16 dst1;
100 __u16 lastopt;
101 __u16 nhoff;
102 __u16 flags;
103 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
104 __u16 dsthao;
105 #endif
106 __u16 frag_max_size;
107
108 #define IP6SKB_XFRM_TRANSFORMED 1
109 #define IP6SKB_FORWARDED 2
110 #define IP6SKB_REROUTED 4
111 #define IP6SKB_ROUTERALERT 8
112 #define IP6SKB_FRAGMENTED 16
113 };
114
115 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
116 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
117
inet6_iif(const struct sk_buff * skb)118 static inline int inet6_iif(const struct sk_buff *skb)
119 {
120 return IP6CB(skb)->iif;
121 }
122
123 struct tcp6_request_sock {
124 struct tcp_request_sock tcp6rsk_tcp;
125 };
126
127 struct ipv6_mc_socklist;
128 struct ipv6_ac_socklist;
129 struct ipv6_fl_socklist;
130
131 /**
132 * struct ipv6_pinfo - ipv6 private area
133 *
134 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
135 * this _must_ be the last member, so that inet6_sk_generic
136 * is able to calculate its offset from the base struct sock
137 * by using the struct proto->slab_obj_size member. -acme
138 */
139 struct ipv6_pinfo {
140 struct in6_addr saddr;
141 struct in6_pktinfo sticky_pktinfo;
142 const struct in6_addr *daddr_cache;
143 #ifdef CONFIG_IPV6_SUBTREES
144 const struct in6_addr *saddr_cache;
145 #endif
146
147 __be32 flow_label;
148 __u32 frag_size;
149
150 /*
151 * Packed in 16bits.
152 * Omit one shift by by putting the signed field at MSB.
153 */
154 #if defined(__BIG_ENDIAN_BITFIELD)
155 __s16 hop_limit:9;
156 __u16 __unused_1:7;
157 #else
158 __u16 __unused_1:7;
159 __s16 hop_limit:9;
160 #endif
161
162 #if defined(__BIG_ENDIAN_BITFIELD)
163 /* Packed in 16bits. */
164 __s16 mcast_hops:9;
165 __u16 __unused_2:6,
166 mc_loop:1;
167 #else
168 __u16 mc_loop:1,
169 __unused_2:6;
170 __s16 mcast_hops:9;
171 #endif
172 int ucast_oif;
173 int mcast_oif;
174
175 /* pktoption flags */
176 union {
177 struct {
178 __u16 srcrt:1,
179 osrcrt:1,
180 rxinfo:1,
181 rxoinfo:1,
182 rxhlim:1,
183 rxohlim:1,
184 hopopts:1,
185 ohopopts:1,
186 dstopts:1,
187 odstopts:1,
188 rxflow:1,
189 rxtclass:1,
190 rxpmtu:1,
191 rxorigdstaddr:1;
192 /* 2 bits hole */
193 } bits;
194 __u16 all;
195 } rxopt;
196
197 /* sockopt flags */
198 __u16 recverr:1,
199 sndflow:1,
200 repflow:1,
201 pmtudisc:3,
202 padding:1, /* 1 bit hole */
203 srcprefs:3, /* 001: prefer temporary address
204 * 010: prefer public address
205 * 100: prefer care-of address
206 */
207 dontfrag:1,
208 autoflowlabel:1;
209 __u8 min_hopcount;
210 __u8 tclass;
211 __be32 rcv_flowinfo;
212
213 __u32 dst_cookie;
214 __u32 rx_dst_cookie;
215
216 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
217 struct ipv6_ac_socklist *ipv6_ac_list;
218 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
219
220 struct ipv6_txoptions __rcu *opt;
221 struct sk_buff *pktoptions;
222 struct sk_buff *rxpmtu;
223 struct {
224 struct ipv6_txoptions *opt;
225 u8 hop_limit;
226 u8 tclass;
227 } cork;
228 };
229
230 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
231 struct raw6_sock {
232 /* inet_sock has to be the first member of raw6_sock */
233 struct inet_sock inet;
234 __u32 checksum; /* perform checksum */
235 __u32 offset; /* checksum offset */
236 struct icmp6_filter filter;
237 __u32 ip6mr_table;
238 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
239 struct ipv6_pinfo inet6;
240 };
241
242 struct udp6_sock {
243 struct udp_sock udp;
244 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
245 struct ipv6_pinfo inet6;
246 };
247
248 struct tcp6_sock {
249 struct tcp_sock tcp;
250 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
251 struct ipv6_pinfo inet6;
252 };
253
254 extern int inet6_sk_rebuild_header(struct sock *sk);
255
256 struct tcp6_timewait_sock {
257 struct tcp_timewait_sock tcp6tw_tcp;
258 };
259
260 #if IS_ENABLED(CONFIG_IPV6)
inet6_sk(const struct sock * __sk)261 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
262 {
263 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
264 }
265
raw6_sk(const struct sock * sk)266 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
267 {
268 return (struct raw6_sock *)sk;
269 }
270
inet_sk_copy_descendant(struct sock * sk_to,const struct sock * sk_from)271 static inline void inet_sk_copy_descendant(struct sock *sk_to,
272 const struct sock *sk_from)
273 {
274 int ancestor_size = sizeof(struct inet_sock);
275
276 if (sk_from->sk_family == PF_INET6)
277 ancestor_size += sizeof(struct ipv6_pinfo);
278
279 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
280 }
281
282 #define __ipv6_only_sock(sk) (sk->sk_ipv6only)
283 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
284 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
285 inet6_sk(sk)->rxopt.bits.rxinfo)
286
inet6_rcv_saddr(const struct sock * sk)287 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
288 {
289 if (sk->sk_family == AF_INET6)
290 return &sk->sk_v6_rcv_saddr;
291 return NULL;
292 }
293
inet_v6_ipv6only(const struct sock * sk)294 static inline int inet_v6_ipv6only(const struct sock *sk)
295 {
296 /* ipv6only field is at same position for timewait and other sockets */
297 return ipv6_only_sock(sk);
298 }
299 #else
300 #define __ipv6_only_sock(sk) 0
301 #define ipv6_only_sock(sk) 0
302 #define ipv6_sk_rxinfo(sk) 0
303
inet6_sk(const struct sock * __sk)304 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
305 {
306 return NULL;
307 }
308
309 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)310 inet6_rsk(const struct request_sock *rsk)
311 {
312 return NULL;
313 }
314
raw6_sk(const struct sock * sk)315 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
316 {
317 return NULL;
318 }
319
320 #define inet6_rcv_saddr(__sk) NULL
321 #define tcp_twsk_ipv6only(__sk) 0
322 #define inet_v6_ipv6only(__sk) 0
323 #endif /* IS_ENABLED(CONFIG_IPV6) */
324
325 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \
326 (((__sk)->sk_portpair == (__ports)) && \
327 ((__sk)->sk_family == AF_INET6) && \
328 ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr)) && \
329 ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr)) && \
330 (!(__sk)->sk_bound_dev_if || \
331 ((__sk)->sk_bound_dev_if == (__dif))) && \
332 net_eq(sock_net(__sk), (__net)))
333
334 #endif /* _IPV6_H */
335