projects/linux·blob v3.13 · refs

333 lines · 7.5 KiB

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 */
11struct 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#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
43 __s32 optimistic_dad;
44#endif
45#ifdef CONFIG_IPV6_MROUTE
46 __s32 mc_forwarding;
47#endif
48 __s32 disable_ipv6;
49 __s32 accept_dad;
50 __s32 force_tllao;
51 __s32 ndisc_notify;
52 __s32 suppress_frag_ndisc;
53 void *sysctl;
54};
55
56struct ipv6_params {
57 __s32 disable_ipv6;
58 __s32 autoconf;
59};
60extern struct ipv6_params ipv6_defaults;
61#include <linux/icmpv6.h>
62#include <linux/tcp.h>
63#include <linux/udp.h>
64
65#include <net/inet_sock.h>
66
67static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
68{
69 return (struct ipv6hdr *)skb_network_header(skb);
70}
71
72static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
73{
74 return (struct ipv6hdr *)skb_inner_network_header(skb);
75}
76
77static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
78{
79 return (struct ipv6hdr *)skb_transport_header(skb);
80}
81
82/*
83 This structure contains results of exthdrs parsing
84 as offsets from skb->nh.
85 */
86
87struct inet6_skb_parm {
88 int iif;
89 __be16 ra;
90 __u16 hop;
91 __u16 dst0;
92 __u16 srcrt;
93 __u16 dst1;
94 __u16 lastopt;
95 __u16 nhoff;
96 __u16 flags;
97#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
98 __u16 dsthao;
99#endif
100 __u16 frag_max_size;
101
102#define IP6SKB_XFRM_TRANSFORMED 1
103#define IP6SKB_FORWARDED 2
104#define IP6SKB_REROUTED 4
105#define IP6SKB_ROUTERALERT 8
106#define IP6SKB_FRAGMENTED 16
107};
108
109#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
110#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
111
112static inline int inet6_iif(const struct sk_buff *skb)
113{
114 return IP6CB(skb)->iif;
115}
116
117struct tcp6_request_sock {
118 struct tcp_request_sock tcp6rsk_tcp;
119};
120
121struct ipv6_mc_socklist;
122struct ipv6_ac_socklist;
123struct ipv6_fl_socklist;
124
125/**
126 * struct ipv6_pinfo - ipv6 private area
127 *
128 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
129 * this _must_ be the last member, so that inet6_sk_generic
130 * is able to calculate its offset from the base struct sock
131 * by using the struct proto->slab_obj_size member. -acme
132 */
133struct ipv6_pinfo {
134 struct in6_addr saddr;
135 struct in6_pktinfo sticky_pktinfo;
136 const struct in6_addr *daddr_cache;
137#ifdef CONFIG_IPV6_SUBTREES
138 const struct in6_addr *saddr_cache;
139#endif
140
141 __be32 flow_label;
142 __u32 frag_size;
143
144 /*
145 * Packed in 16bits.
146 * Omit one shift by by putting the signed field at MSB.
147 */
148#if defined(__BIG_ENDIAN_BITFIELD)
149 __s16 hop_limit:9;
150 __u16 __unused_1:7;
151#else
152 __u16 __unused_1:7;
153 __s16 hop_limit:9;
154#endif
155
156#if defined(__BIG_ENDIAN_BITFIELD)
157 /* Packed in 16bits. */
158 __s16 mcast_hops:9;
159 __u16 __unused_2:6,
160 mc_loop:1;
161#else
162 __u16 mc_loop:1,
163 __unused_2:6;
164 __s16 mcast_hops:9;
165#endif
166 int ucast_oif;
167 int mcast_oif;
168
169 /* pktoption flags */
170 union {
171 struct {
172 __u16 srcrt:1,
173 osrcrt:1,
174 rxinfo:1,
175 rxoinfo:1,
176 rxhlim:1,
177 rxohlim:1,
178 hopopts:1,
179 ohopopts:1,
180 dstopts:1,
181 odstopts:1,
182 rxflow:1,
183 rxtclass:1,
184 rxpmtu:1,
185 rxorigdstaddr:1;
186 /* 2 bits hole */
187 } bits;
188 __u16 all;
189 } rxopt;
190
191 /* sockopt flags */
192 __u16 recverr:1,
193 sndflow:1,
194 pmtudisc:2,
195 ipv6only:1,
196 srcprefs:3, /* 001: prefer temporary address
197 * 010: prefer public address
198 * 100: prefer care-of address
199 */
200 dontfrag:1;
201 __u8 min_hopcount;
202 __u8 tclass;
203 __u8 rcv_tclass;
204
205 __u32 dst_cookie;
206 __u32 rx_dst_cookie;
207
208 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
209 struct ipv6_ac_socklist *ipv6_ac_list;
210 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
211
212 struct ipv6_txoptions *opt;
213 struct sk_buff *pktoptions;
214 struct sk_buff *rxpmtu;
215 struct {
216 struct ipv6_txoptions *opt;
217 u8 hop_limit;
218 u8 tclass;
219 } cork;
220};
221
222/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
223struct raw6_sock {
224 /* inet_sock has to be the first member of raw6_sock */
225 struct inet_sock inet;
226 __u32 checksum; /* perform checksum */
227 __u32 offset; /* checksum offset */
228 struct icmp6_filter filter;
229 __u32 ip6mr_table;
230 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
231 struct ipv6_pinfo inet6;
232};
233
234struct udp6_sock {
235 struct udp_sock udp;
236 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
237 struct ipv6_pinfo inet6;
238};
239
240struct tcp6_sock {
241 struct tcp_sock tcp;
242 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
243 struct ipv6_pinfo inet6;
244};
245
246extern int inet6_sk_rebuild_header(struct sock *sk);
247
248struct tcp6_timewait_sock {
249 struct tcp_timewait_sock tcp6tw_tcp;
250};
251
252#if IS_ENABLED(CONFIG_IPV6)
253static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
254{
255 return inet_sk(__sk)->pinet6;
256}
257
258static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
259{
260 struct request_sock *req = reqsk_alloc(ops);
261
262 if (req)
263 inet_rsk(req)->pktopts = NULL;
264
265 return req;
266}
267
268static inline struct raw6_sock *raw6_sk(const struct sock *sk)
269{
270 return (struct raw6_sock *)sk;
271}
272
273static inline void inet_sk_copy_descendant(struct sock *sk_to,
274 const struct sock *sk_from)
275{
276 int ancestor_size = sizeof(struct inet_sock);
277
278 if (sk_from->sk_family == PF_INET6)
279 ancestor_size += sizeof(struct ipv6_pinfo);
280
281 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
282}
283
284#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
285#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
286
287static 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
294static inline int inet_v6_ipv6only(const struct sock *sk)
295{
296 return likely(sk->sk_state != TCP_TIME_WAIT) ?
297 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
298}
299#else
300#define __ipv6_only_sock(sk) 0
301#define ipv6_only_sock(sk) 0
302
303static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
304{
305 return NULL;
306}
307
308static inline struct inet6_request_sock *
309 inet6_rsk(const struct request_sock *rsk)
310{
311 return NULL;
312}
313
314static 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
324#define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \
325 (((__sk)->sk_portpair == (__ports)) && \
326 ((__sk)->sk_family == AF_INET6) && \
327 ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr)) && \
328 ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr)) && \
329 (!(__sk)->sk_bound_dev_if || \
330 ((__sk)->sk_bound_dev_if == (__dif))) && \
331 net_eq(sock_net(__sk), (__net)))
332
333#endif /* _IPV6_H */