1 /*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <roque@di.fc.ul.pt>
6 *
7 * $Id: ipv6.h,v 1.22 2000/09/18 05:54:13 davem Exp $
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 #ifndef _NET_IPV6_H
16 #define _NET_IPV6_H
17
18 #include <linux/ipv6.h>
19 #include <asm/hardirq.h>
20 #include <net/ndisc.h>
21 #include <net/flow.h>
22
23 #define SIN6_LEN_RFC2133 24
24
25 /*
26 * NextHeader field of IPv6 header
27 */
28
29 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
30 #define NEXTHDR_TCP 6 /* TCP segment. */
31 #define NEXTHDR_UDP 17 /* UDP message. */
32 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
33 #define NEXTHDR_ROUTING 43 /* Routing header. */
34 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
35 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
36 #define NEXTHDR_AUTH 51 /* Authentication header. */
37 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
38 #define NEXTHDR_NONE 59 /* No next header */
39 #define NEXTHDR_DEST 60 /* Destination options header. */
40
41 #define NEXTHDR_MAX 255
42
43
44
45 #define IPV6_DEFAULT_HOPLIMIT 64
46 #define IPV6_DEFAULT_MCASTHOPS 1
47
48 /*
49 * Addr type
50 *
51 * type - unicast | multicast | anycast
52 * scope - local | site | global
53 * v4 - compat
54 * v4mapped
55 * any
56 * loopback
57 */
58
59 #define IPV6_ADDR_ANY 0x0000U
60
61 #define IPV6_ADDR_UNICAST 0x0001U
62 #define IPV6_ADDR_MULTICAST 0x0002U
63 #define IPV6_ADDR_ANYCAST 0x0004U
64
65 #define IPV6_ADDR_LOOPBACK 0x0010U
66 #define IPV6_ADDR_LINKLOCAL 0x0020U
67 #define IPV6_ADDR_SITELOCAL 0x0040U
68
69 #define IPV6_ADDR_COMPATv4 0x0080U
70
71 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
72
73 #define IPV6_ADDR_MAPPED 0x1000U
74 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
75
76 /*
77 * fragmentation header
78 */
79
80 struct frag_hdr {
81 unsigned char nexthdr;
82 unsigned char reserved;
83 unsigned short frag_off;
84 __u32 identification;
85 };
86
87 #ifdef __KERNEL__
88
89 #include <net/sock.h>
90
91 extern struct ipv6_mib ipv6_statistics[NR_CPUS*2];
92 #define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field)
93 #define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
94 #define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
95 extern struct icmpv6_mib icmpv6_statistics[NR_CPUS*2];
96 #define ICMP6_INC_STATS(field) SNMP_INC_STATS(icmpv6_statistics, field)
97 #define ICMP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(icmpv6_statistics, field)
98 #define ICMP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(icmpv6_statistics, field)
99 extern struct udp_mib udp_stats_in6[NR_CPUS*2];
100 #define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
101 #define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
102 #define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
103 extern atomic_t inet6_sock_nr;
104
105 struct ip6_ra_chain
106 {
107 struct ip6_ra_chain *next;
108 struct sock *sk;
109 int sel;
110 void (*destructor)(struct sock *);
111 };
112
113 extern struct ip6_ra_chain *ip6_ra_chain;
114 extern rwlock_t ip6_ra_lock;
115
116 /*
117 This structure is prepared by protocol, when parsing
118 ancillary data and passed to IPv6.
119 */
120
121 struct ipv6_txoptions
122 {
123 /* Length of this structure */
124 int tot_len;
125
126 /* length of extension headers */
127
128 __u16 opt_flen; /* after fragment hdr */
129 __u16 opt_nflen; /* before fragment hdr */
130
131 struct ipv6_opt_hdr *hopopt;
132 struct ipv6_opt_hdr *dst0opt;
133 struct ipv6_rt_hdr *srcrt; /* Routing Header */
134 struct ipv6_opt_hdr *auth;
135 struct ipv6_opt_hdr *dst1opt;
136
137 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
138 };
139
140 struct ip6_flowlabel
141 {
142 struct ip6_flowlabel *next;
143 u32 label;
144 struct in6_addr dst;
145 struct ipv6_txoptions *opt;
146 atomic_t users;
147 u32 linger;
148 u8 share;
149 u32 owner;
150 unsigned long lastuse;
151 unsigned long expires;
152 };
153
154 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
155 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
156
157 struct ipv6_fl_socklist
158 {
159 struct ipv6_fl_socklist *next;
160 struct ip6_flowlabel *fl;
161 };
162
163 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label);
164 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
165 struct ip6_flowlabel * fl,
166 struct ipv6_txoptions * fopt);
167 extern void fl6_free_socklist(struct sock *sk);
168 extern int ipv6_flowlabel_opt(struct sock *sk, char *optval, int optlen);
169 extern void ip6_flowlabel_init(void);
170 extern void ip6_flowlabel_cleanup(void);
171
172 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
173 {
174 if (fl)
175 atomic_dec(&fl->users);
176 }
177
178 extern int ip6_ra_control(struct sock *sk, int sel,
179 void (*destructor)(struct sock *));
180
181
182 extern int ip6_call_ra_chain(struct sk_buff *skb, int sel);
183
184 extern u8 * ipv6_reassembly(struct sk_buff **skb, u8 *nhptr);
185
186 extern u8 * ipv6_parse_hopopts(struct sk_buff *skb, u8 *nhptr);
187
188 extern u8 * ipv6_parse_exthdrs(struct sk_buff **skb, u8 *nhptr);
189
190 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
191
192 extern int ip6_frag_nqueues;
193 extern atomic_t ip6_frag_mem;
194
195 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
196
197 /*
198 * Function prototype for build_xmit
199 */
200
201 typedef int (*inet_getfrag_t) (const void *data,
202 struct in6_addr *addr,
203 char *,
204 unsigned int, unsigned int);
205
206
207 extern int ipv6_addr_type(struct in6_addr *addr);
208
209 static inline int ipv6_addr_scope(struct in6_addr *addr)
210 {
211 return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
212 }
213
214 static inline int ipv6_addr_cmp(struct in6_addr *a1, struct in6_addr *a2)
215 {
216 return memcmp((void *) a1, (void *) a2, sizeof(struct in6_addr));
217 }
218
219 static inline void ipv6_addr_copy(struct in6_addr *a1, struct in6_addr *a2)
220 {
221 memcpy((void *) a1, (void *) a2, sizeof(struct in6_addr));
222 }
223
224 #ifndef __HAVE_ARCH_ADDR_SET
225 static inline void ipv6_addr_set(struct in6_addr *addr,
226 __u32 w1, __u32 w2,
227 __u32 w3, __u32 w4)
228 {
229 addr->s6_addr32[0] = w1;
230 addr->s6_addr32[1] = w2;
231 addr->s6_addr32[2] = w3;
232 addr->s6_addr32[3] = w4;
233 }
234 #endif
235
236 static inline int ipv6_addr_any(struct in6_addr *a)
237 {
238 return ((a->s6_addr32[0] | a->s6_addr32[1] |
239 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
240 }
241
242 /*
243 * Prototypes exported by ipv6
244 */
245
246 /*
247 * rcv function (called from netdevice level)
248 */
249
250 extern int ipv6_rcv(struct sk_buff *skb,
251 struct net_device *dev,
252 struct packet_type *pt);
253
254 /*
255 * upper-layer output functions
256 */
257 extern int ip6_xmit(struct sock *sk,
258 struct sk_buff *skb,
259 struct flowi *fl,
260 struct ipv6_txoptions *opt);
261
262 extern int ip6_nd_hdr(struct sock *sk,
263 struct sk_buff *skb,
264 struct net_device *dev,
265 struct in6_addr *saddr,
266 struct in6_addr *daddr,
267 int proto, int len);
268
269 extern int ip6_build_xmit(struct sock *sk,
270 inet_getfrag_t getfrag,
271 const void *data,
272 struct flowi *fl,
273 unsigned length,
274 struct ipv6_txoptions *opt,
275 int hlimit, int flags);
276
277 /*
278 * skb processing functions
279 */
280
281 extern int ip6_output(struct sk_buff *skb);
282 extern int ip6_forward(struct sk_buff *skb);
283 extern int ip6_input(struct sk_buff *skb);
284 extern int ip6_mc_input(struct sk_buff *skb);
285
286 /*
287 * Extension header (options) processing
288 */
289
290 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
291 u8 *prev_hdr,
292 struct ipv6_txoptions *opt,
293 struct in6_addr *daddr,
294 u32 jumbolen);
295 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
296 u8 *prev_hdr,
297 struct ipv6_txoptions *opt);
298 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
299 struct ipv6_txoptions *opt,
300 u8 *proto,
301 struct in6_addr **daddr_p);
302 extern void ipv6_push_frag_opts(struct sk_buff *skb,
303 struct ipv6_txoptions *opt,
304 u8 *proto);
305
306 extern u8 * ipv6_skip_exthdr(struct ipv6_opt_hdr *hdr,
307 u8 *nexthdrp, int len);
308
309 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
310 struct ipv6_rt_hdr *hdr);
311
312
313 /*
314 * socket options (ipv6_sockglue.c)
315 */
316
317 extern int ipv6_setsockopt(struct sock *sk, int level,
318 int optname, char *optval,
319 int optlen);
320 extern int ipv6_getsockopt(struct sock *sk, int level,
321 int optname, char *optval,
322 int *optlen);
323
324 extern void ipv6_packet_init(void);
325
326 extern void ipv6_netdev_notif_init(void);
327
328 extern void ipv6_packet_cleanup(void);
329
330 extern void ipv6_netdev_notif_cleanup(void);
331
332 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
333 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
334 u32 info, u8 *payload);
335 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
336
337 #endif /* __KERNEL__ */
338 #endif /* _NET_IPV6_H */
339
340
341
342
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