1 /*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <pedro_m@yahoo.com>
6 *
7 * $Id: ipv6.h,v 1.23 2000/12/13 18:31:48 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 * Addr scopes
78 */
79 #ifdef __KERNEL__
80 #define IPV6_ADDR_MC_SCOPE(a) \
81 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
82 #define __IPV6_ADDR_SCOPE_INVALID -1
83 #endif
84 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
85 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
86 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
87 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
88 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
89
90 /*
91 * fragmentation header
92 */
93
94 struct frag_hdr {
95 unsigned char nexthdr;
96 unsigned char reserved;
97 unsigned short frag_off;
98 __u32 identification;
99 };
100
101 #ifdef __KERNEL__
102
103 #include <net/sock.h>
104 #include <net/snmp.h>
105
106 /* sysctls */
107 extern int sysctl_ipv6_bindv6only;
108 extern int sysctl_mld_max_msf;
109
110 extern struct ipv6_mib ipv6_statistics[NR_CPUS*2];
111 #define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field)
112 #define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
113 #define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
114 extern struct icmpv6_mib icmpv6_statistics[NR_CPUS*2];
115 #define ICMP6_INC_STATS(field) SNMP_INC_STATS(icmpv6_statistics, field)
116 #define ICMP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(icmpv6_statistics, field)
117 #define ICMP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(icmpv6_statistics, field)
118 extern struct udp_mib udp_stats_in6[NR_CPUS*2];
119 #define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
120 #define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
121 #define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
122 extern atomic_t inet6_sock_nr;
123
124 struct ip6_ra_chain
125 {
126 struct ip6_ra_chain *next;
127 struct sock *sk;
128 int sel;
129 void (*destructor)(struct sock *);
130 };
131
132 extern struct ip6_ra_chain *ip6_ra_chain;
133 extern rwlock_t ip6_ra_lock;
134
135 /*
136 This structure is prepared by protocol, when parsing
137 ancillary data and passed to IPv6.
138 */
139
140 struct ipv6_txoptions
141 {
142 /* Length of this structure */
143 int tot_len;
144
145 /* length of extension headers */
146
147 __u16 opt_flen; /* after fragment hdr */
148 __u16 opt_nflen; /* before fragment hdr */
149
150 struct ipv6_opt_hdr *hopopt;
151 struct ipv6_opt_hdr *dst0opt;
152 struct ipv6_rt_hdr *srcrt; /* Routing Header */
153 struct ipv6_opt_hdr *auth;
154 struct ipv6_opt_hdr *dst1opt;
155
156 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
157 };
158
159 struct ip6_flowlabel
160 {
161 struct ip6_flowlabel *next;
162 u32 label;
163 struct in6_addr dst;
164 struct ipv6_txoptions *opt;
165 atomic_t users;
166 u32 linger;
167 u8 share;
168 u32 owner;
169 unsigned long lastuse;
170 unsigned long expires;
171 };
172
173 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
174 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
175
176 struct ipv6_fl_socklist
177 {
178 struct ipv6_fl_socklist *next;
179 struct ip6_flowlabel *fl;
180 };
181
182 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label);
183 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
184 struct ip6_flowlabel * fl,
185 struct ipv6_txoptions * fopt);
186 extern void fl6_free_socklist(struct sock *sk);
187 extern int ipv6_flowlabel_opt(struct sock *sk, char *optval, int optlen);
188 extern void ip6_flowlabel_init(void);
189 extern void ip6_flowlabel_cleanup(void);
190
fl6_sock_release(struct ip6_flowlabel * fl)191 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
192 {
193 if (fl)
194 atomic_dec(&fl->users);
195 }
196
197 extern int ip6_ra_control(struct sock *sk, int sel,
198 void (*destructor)(struct sock *));
199
200
201 extern int ip6_call_ra_chain(struct sk_buff *skb, int sel);
202
203 extern int ipv6_reassembly(struct sk_buff **skb, int);
204
205 extern int ipv6_parse_hopopts(struct sk_buff *skb, int);
206
207 extern int ipv6_parse_exthdrs(struct sk_buff **skb, int);
208
209 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
210
211 extern int ip6_frag_nqueues;
212 extern atomic_t ip6_frag_mem;
213
214 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
215
216 /*
217 * Function prototype for build_xmit
218 */
219
220 typedef int (*inet_getfrag_t) (const void *data,
221 struct in6_addr *addr,
222 char *,
223 unsigned int, unsigned int);
224
225
226 extern int ipv6_addr_type(const struct in6_addr *addr);
227
ipv6_addr_scope(const struct in6_addr * addr)228 static inline int ipv6_addr_scope(const struct in6_addr *addr)
229 {
230 return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
231 }
232
ipv6_addr_cmp(const struct in6_addr * a1,const struct in6_addr * a2)233 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
234 {
235 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
236 }
237
ipv6_addr_copy(struct in6_addr * a1,const struct in6_addr * a2)238 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
239 {
240 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
241 }
242
243 #ifndef __HAVE_ARCH_ADDR_SET
ipv6_addr_set(struct in6_addr * addr,__u32 w1,__u32 w2,__u32 w3,__u32 w4)244 static inline void ipv6_addr_set(struct in6_addr *addr,
245 __u32 w1, __u32 w2,
246 __u32 w3, __u32 w4)
247 {
248 addr->s6_addr32[0] = w1;
249 addr->s6_addr32[1] = w2;
250 addr->s6_addr32[2] = w3;
251 addr->s6_addr32[3] = w4;
252 }
253 #endif
254
ipv6_addr_any(const struct in6_addr * a)255 static inline int ipv6_addr_any(const struct in6_addr *a)
256 {
257 return ((a->s6_addr32[0] | a->s6_addr32[1] |
258 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
259 }
260
261 /*
262 * Prototypes exported by ipv6
263 */
264
265 /*
266 * rcv function (called from netdevice level)
267 */
268
269 extern int ipv6_rcv(struct sk_buff *skb,
270 struct net_device *dev,
271 struct packet_type *pt);
272
273 /*
274 * upper-layer output functions
275 */
276 extern int ip6_xmit(struct sock *sk,
277 struct sk_buff *skb,
278 struct flowi *fl,
279 struct ipv6_txoptions *opt);
280
281 extern int ip6_nd_hdr(struct sock *sk,
282 struct sk_buff *skb,
283 struct net_device *dev,
284 struct in6_addr *saddr,
285 struct in6_addr *daddr,
286 int proto, int len);
287
288 extern int ip6_build_xmit(struct sock *sk,
289 inet_getfrag_t getfrag,
290 const void *data,
291 struct flowi *fl,
292 unsigned length,
293 struct ipv6_txoptions *opt,
294 int hlimit, int flags);
295
296 /*
297 * skb processing functions
298 */
299
300 extern int ip6_output(struct sk_buff *skb);
301 extern int ip6_forward(struct sk_buff *skb);
302 extern int ip6_input(struct sk_buff *skb);
303 extern int ip6_mc_input(struct sk_buff *skb);
304
305 /*
306 * Extension header (options) processing
307 */
308
309 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
310 u8 *prev_hdr,
311 struct ipv6_txoptions *opt,
312 struct in6_addr *daddr,
313 u32 jumbolen);
314 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
315 u8 *prev_hdr,
316 struct ipv6_txoptions *opt);
317 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
318 struct ipv6_txoptions *opt,
319 u8 *proto,
320 struct in6_addr **daddr_p);
321 extern void ipv6_push_frag_opts(struct sk_buff *skb,
322 struct ipv6_txoptions *opt,
323 u8 *proto);
324
325 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
326 u8 *nexthdrp, int len);
327
328 extern int ipv6_ext_hdr(u8 nexthdr);
329
330 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
331 struct ipv6_rt_hdr *hdr);
332
333
334 /*
335 * socket options (ipv6_sockglue.c)
336 */
337
338 extern int ipv6_setsockopt(struct sock *sk, int level,
339 int optname, char *optval,
340 int optlen);
341 extern int ipv6_getsockopt(struct sock *sk, int level,
342 int optname, char *optval,
343 int *optlen);
344
345 extern void ipv6_packet_init(void);
346
347 extern void ipv6_netdev_notif_init(void);
348
349 extern void ipv6_packet_cleanup(void);
350
351 extern void ipv6_netdev_notif_cleanup(void);
352
353 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
354 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
355 u32 info, u8 *payload);
356 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
357
358 extern int inet6_release(struct socket *sock);
359 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
360 int addr_len);
361 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
362 int *uaddr_len, int peer);
363 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
364 unsigned long arg);
365
366 #endif /* __KERNEL__ */
367 #endif /* _NET_IPV6_H */
368
369
370
371