2 * Linux INET6 implementation
5 * Pedro Roque <roque@di.fc.ul.pt>
7 * $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
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.
18 #include <linux/ipv6.h>
19 #include <linux/hardirq.h>
20 #include <net/if_inet6.h>
21 #include <net/ndisc.h>
25 #define SIN6_LEN_RFC2133 24
27 #define IPV6_MAXPLEN 65535
30 * NextHeader field of IPv6 header
33 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
34 #define NEXTHDR_TCP 6 /* TCP segment. */
35 #define NEXTHDR_UDP 17 /* UDP message. */
36 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
37 #define NEXTHDR_ROUTING 43 /* Routing header. */
38 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
39 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
40 #define NEXTHDR_AUTH 51 /* Authentication header. */
41 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
42 #define NEXTHDR_NONE 59 /* No next header */
43 #define NEXTHDR_DEST 60 /* Destination options header. */
44 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
46 #define NEXTHDR_MAX 255
50 #define IPV6_DEFAULT_HOPLIMIT 64
51 #define IPV6_DEFAULT_MCASTHOPS 1
56 * type - unicast | multicast
57 * scope - local | site | global
64 #define IPV6_ADDR_ANY 0x0000U
66 #define IPV6_ADDR_UNICAST 0x0001U
67 #define IPV6_ADDR_MULTICAST 0x0002U
69 #define IPV6_ADDR_LOOPBACK 0x0010U
70 #define IPV6_ADDR_LINKLOCAL 0x0020U
71 #define IPV6_ADDR_SITELOCAL 0x0040U
73 #define IPV6_ADDR_COMPATv4 0x0080U
75 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
77 #define IPV6_ADDR_MAPPED 0x1000U
78 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
84 #define IPV6_ADDR_MC_SCOPE(a) \
85 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
86 #define __IPV6_ADDR_SCOPE_INVALID -1
88 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
89 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
90 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
91 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
92 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
95 * fragmentation header
102 __be32 identification
;
105 #define IP6_MF 0x0001
109 #include <net/sock.h>
112 extern int sysctl_ipv6_bindv6only
;
113 extern int sysctl_mld_max_msf
;
116 DECLARE_SNMP_STAT(struct ipstats_mib
, ipv6_statistics
);
117 #define IP6_INC_STATS(idev,field) ({ \
118 struct inet6_dev *_idev = (idev); \
119 if (likely(_idev != NULL)) \
120 SNMP_INC_STATS(_idev->stats.ipv6, field); \
121 SNMP_INC_STATS(ipv6_statistics, field); \
123 #define IP6_INC_STATS_BH(idev,field) ({ \
124 struct inet6_dev *_idev = (idev); \
125 if (likely(_idev != NULL)) \
126 SNMP_INC_STATS_BH(_idev->stats.ipv6, field); \
127 SNMP_INC_STATS_BH(ipv6_statistics, field); \
129 #define IP6_INC_STATS_USER(idev,field) ({ \
130 struct inet6_dev *_idev = (idev); \
131 if (likely(_idev != NULL)) \
132 SNMP_INC_STATS_USER(_idev->stats.ipv6, field); \
133 SNMP_INC_STATS_USER(ipv6_statistics, field); \
135 DECLARE_SNMP_STAT(struct icmpv6_mib
, icmpv6_statistics
);
136 #define ICMP6_INC_STATS(idev, field) ({ \
137 struct inet6_dev *_idev = (idev); \
138 if (likely(_idev != NULL)) \
139 SNMP_INC_STATS(idev->stats.icmpv6, field); \
140 SNMP_INC_STATS(icmpv6_statistics, field); \
142 #define ICMP6_INC_STATS_BH(idev, field) ({ \
143 struct inet6_dev *_idev = (idev); \
144 if (likely(_idev != NULL)) \
145 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
146 SNMP_INC_STATS_BH(icmpv6_statistics, field); \
148 #define ICMP6_INC_STATS_USER(idev, field) ({ \
149 struct inet6_dev *_idev = (idev); \
150 if (likely(_idev != NULL)) \
151 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
152 SNMP_INC_STATS_USER(icmpv6_statistics, field); \
154 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
155 struct inet6_dev *_idev = idev; \
156 __typeof__(offset) _offset = (offset); \
157 if (likely(_idev != NULL)) \
158 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
159 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
161 DECLARE_SNMP_STAT(struct udp_mib
, udp_stats_in6
);
162 DECLARE_SNMP_STAT(struct udp_mib
, udplite_stats_in6
);
163 #define UDP6_INC_STATS_BH(field, is_udplite) do { \
164 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \
165 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0)
166 #define UDP6_INC_STATS_USER(field, is_udplite) do { \
167 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \
168 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0)
172 struct ip6_ra_chain
*next
;
175 void (*destructor
)(struct sock
*);
178 extern struct ip6_ra_chain
*ip6_ra_chain
;
179 extern rwlock_t ip6_ra_lock
;
182 This structure is prepared by protocol, when parsing
183 ancillary data and passed to IPv6.
186 struct ipv6_txoptions
188 /* Length of this structure */
191 /* length of extension headers */
193 __u16 opt_flen
; /* after fragment hdr */
194 __u16 opt_nflen
; /* before fragment hdr */
196 struct ipv6_opt_hdr
*hopopt
;
197 struct ipv6_opt_hdr
*dst0opt
;
198 struct ipv6_rt_hdr
*srcrt
; /* Routing Header */
199 struct ipv6_opt_hdr
*dst1opt
;
201 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
206 struct ip6_flowlabel
*next
;
210 struct ipv6_txoptions
*opt
;
211 unsigned long linger
;
214 unsigned long lastuse
;
215 unsigned long expires
;
218 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
219 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
221 struct ipv6_fl_socklist
223 struct ipv6_fl_socklist
*next
;
224 struct ip6_flowlabel
*fl
;
227 extern struct ip6_flowlabel
*fl6_sock_lookup(struct sock
*sk
, __be32 label
);
228 extern struct ipv6_txoptions
*fl6_merge_options(struct ipv6_txoptions
* opt_space
,
229 struct ip6_flowlabel
* fl
,
230 struct ipv6_txoptions
* fopt
);
231 extern void fl6_free_socklist(struct sock
*sk
);
232 extern int ipv6_flowlabel_opt(struct sock
*sk
, char __user
*optval
, int optlen
);
233 extern void ip6_flowlabel_init(void);
234 extern void ip6_flowlabel_cleanup(void);
236 static inline void fl6_sock_release(struct ip6_flowlabel
*fl
)
239 atomic_dec(&fl
->users
);
242 extern int ip6_ra_control(struct sock
*sk
, int sel
,
243 void (*destructor
)(struct sock
*));
246 extern int ipv6_parse_hopopts(struct sk_buff
**skbp
);
248 extern struct ipv6_txoptions
* ipv6_dup_options(struct sock
*sk
, struct ipv6_txoptions
*opt
);
249 extern struct ipv6_txoptions
* ipv6_renew_options(struct sock
*sk
, struct ipv6_txoptions
*opt
,
251 struct ipv6_opt_hdr __user
*newopt
,
253 struct ipv6_txoptions
*ipv6_fixup_options(struct ipv6_txoptions
*opt_space
,
254 struct ipv6_txoptions
*opt
);
256 extern int ipv6_opt_accepted(struct sock
*sk
, struct sk_buff
*skb
);
258 extern int ip6_frag_nqueues
;
259 extern atomic_t ip6_frag_mem
;
261 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
264 * Function prototype for build_xmit
267 typedef int (*inet_getfrag_t
) (const void *data
,
268 struct in6_addr
*addr
,
270 unsigned int, unsigned int);
272 extern int __ipv6_addr_type(const struct in6_addr
*addr
);
273 static inline int ipv6_addr_type(const struct in6_addr
*addr
)
275 return __ipv6_addr_type(addr
) & 0xffff;
278 static inline int ipv6_addr_scope(const struct in6_addr
*addr
)
280 return __ipv6_addr_type(addr
) & IPV6_ADDR_SCOPE_MASK
;
283 static inline int __ipv6_addr_src_scope(int type
)
285 return (type
== IPV6_ADDR_ANY
? __IPV6_ADDR_SCOPE_INVALID
: (type
>> 16));
288 static inline int ipv6_addr_src_scope(const struct in6_addr
*addr
)
290 return __ipv6_addr_src_scope(__ipv6_addr_type(addr
));
293 static inline int ipv6_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
295 return memcmp(a1
, a2
, sizeof(struct in6_addr
));
299 ipv6_masked_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*m
,
300 const struct in6_addr
*a2
)
304 for (i
= 0; i
< 4; i
++)
305 if ((a1
->s6_addr32
[i
] ^ a2
->s6_addr32
[i
]) & m
->s6_addr32
[i
])
310 static inline void ipv6_addr_copy(struct in6_addr
*a1
, const struct in6_addr
*a2
)
312 memcpy(a1
, a2
, sizeof(struct in6_addr
));
315 static inline void ipv6_addr_prefix(struct in6_addr
*pfx
,
316 const struct in6_addr
*addr
,
319 /* caller must guarantee 0 <= plen <= 128 */
323 memset(pfx
->s6_addr
, 0, sizeof(pfx
->s6_addr
));
324 memcpy(pfx
->s6_addr
, addr
, o
);
326 pfx
->s6_addr
[o
] = addr
->s6_addr
[o
] & (0xff00 >> b
);
329 static inline void ipv6_addr_set(struct in6_addr
*addr
,
330 __be32 w1
, __be32 w2
,
331 __be32 w3
, __be32 w4
)
333 addr
->s6_addr32
[0] = w1
;
334 addr
->s6_addr32
[1] = w2
;
335 addr
->s6_addr32
[2] = w3
;
336 addr
->s6_addr32
[3] = w4
;
339 static inline int ipv6_addr_equal(const struct in6_addr
*a1
,
340 const struct in6_addr
*a2
)
342 return (a1
->s6_addr32
[0] == a2
->s6_addr32
[0] &&
343 a1
->s6_addr32
[1] == a2
->s6_addr32
[1] &&
344 a1
->s6_addr32
[2] == a2
->s6_addr32
[2] &&
345 a1
->s6_addr32
[3] == a2
->s6_addr32
[3]);
348 static inline int __ipv6_prefix_equal(const __be32
*a1
, const __be32
*a2
,
349 unsigned int prefixlen
)
353 /* check complete u32 in prefix */
354 pdw
= prefixlen
>> 5;
355 if (pdw
&& memcmp(a1
, a2
, pdw
<< 2))
358 /* check incomplete u32 in prefix */
359 pbi
= prefixlen
& 0x1f;
360 if (pbi
&& ((a1
[pdw
] ^ a2
[pdw
]) & htonl((0xffffffff) << (32 - pbi
))))
366 static inline int ipv6_prefix_equal(const struct in6_addr
*a1
,
367 const struct in6_addr
*a2
,
368 unsigned int prefixlen
)
370 return __ipv6_prefix_equal(a1
->s6_addr32
, a2
->s6_addr32
,
374 static inline int ipv6_addr_any(const struct in6_addr
*a
)
376 return ((a
->s6_addr32
[0] | a
->s6_addr32
[1] |
377 a
->s6_addr32
[2] | a
->s6_addr32
[3] ) == 0);
381 * find the first different bit between two addresses
382 * length of address must be a multiple of 32bits
384 static inline int __ipv6_addr_diff(const void *token1
, const void *token2
, int addrlen
)
386 const __be32
*a1
= token1
, *a2
= token2
;
391 for (i
= 0; i
< addrlen
; i
++) {
392 __be32 xb
= a1
[i
] ^ a2
[i
];
394 return i
* 32 + 32 - fls(ntohl(xb
));
398 * we should *never* get to this point since that
399 * would mean the addrs are equal
401 * However, we do get to it 8) And exacly, when
402 * addresses are equal 8)
404 * ip route add 1111::/128 via ...
405 * ip route add 1111::/64 via ...
408 * Ideally, this function should stop comparison
409 * at prefix length. It does not, but it is still OK,
410 * if returned value is greater than prefix length.
413 return (addrlen
<< 5);
416 static inline int ipv6_addr_diff(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
418 return __ipv6_addr_diff(a1
, a2
, sizeof(struct in6_addr
));
422 * Prototypes exported by ipv6
426 * rcv function (called from netdevice level)
429 extern int ipv6_rcv(struct sk_buff
*skb
,
430 struct net_device
*dev
,
431 struct packet_type
*pt
,
432 struct net_device
*orig_dev
);
434 extern int ip6_rcv_finish(struct sk_buff
*skb
);
437 * upper-layer output functions
439 extern int ip6_xmit(struct sock
*sk
,
442 struct ipv6_txoptions
*opt
,
445 extern int ip6_nd_hdr(struct sock
*sk
,
447 struct net_device
*dev
,
448 struct in6_addr
*saddr
,
449 struct in6_addr
*daddr
,
452 extern int ip6_find_1stfragopt(struct sk_buff
*skb
, u8
**nexthdr
);
454 extern int ip6_append_data(struct sock
*sk
,
455 int getfrag(void *from
, char *to
, int offset
, int len
, int odd
, struct sk_buff
*skb
),
461 struct ipv6_txoptions
*opt
,
466 extern int ip6_push_pending_frames(struct sock
*sk
);
468 extern void ip6_flush_pending_frames(struct sock
*sk
);
470 extern int ip6_dst_lookup(struct sock
*sk
,
471 struct dst_entry
**dst
,
473 extern int ip6_dst_blackhole(struct sock
*sk
,
474 struct dst_entry
**dst
,
476 extern int ip6_sk_dst_lookup(struct sock
*sk
,
477 struct dst_entry
**dst
,
481 * skb processing functions
484 extern int ip6_output(struct sk_buff
*skb
);
485 extern int ip6_forward(struct sk_buff
*skb
);
486 extern int ip6_input(struct sk_buff
*skb
);
487 extern int ip6_mc_input(struct sk_buff
*skb
);
490 * Extension header (options) processing
493 extern u8
* ipv6_build_nfrag_opts(struct sk_buff
*skb
,
495 struct ipv6_txoptions
*opt
,
496 struct in6_addr
*daddr
,
498 extern u8
* ipv6_build_frag_opts(struct sk_buff
*skb
,
500 struct ipv6_txoptions
*opt
);
501 extern void ipv6_push_nfrag_opts(struct sk_buff
*skb
,
502 struct ipv6_txoptions
*opt
,
504 struct in6_addr
**daddr_p
);
505 extern void ipv6_push_frag_opts(struct sk_buff
*skb
,
506 struct ipv6_txoptions
*opt
,
509 extern int ipv6_skip_exthdr(const struct sk_buff
*, int start
,
512 extern int ipv6_ext_hdr(u8 nexthdr
);
514 extern int ipv6_find_tlv(struct sk_buff
*skb
, int offset
, int type
);
517 * socket options (ipv6_sockglue.c)
520 extern int ipv6_setsockopt(struct sock
*sk
, int level
,
524 extern int ipv6_getsockopt(struct sock
*sk
, int level
,
528 extern int compat_ipv6_setsockopt(struct sock
*sk
,
533 extern int compat_ipv6_getsockopt(struct sock
*sk
,
539 extern void ipv6_packet_init(void);
541 extern void ipv6_packet_cleanup(void);
543 extern int ip6_datagram_connect(struct sock
*sk
,
544 struct sockaddr
*addr
, int addr_len
);
546 extern int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
);
547 extern void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
, __be16 port
,
548 u32 info
, u8
*payload
);
549 extern void ipv6_local_error(struct sock
*sk
, int err
, struct flowi
*fl
, u32 info
);
551 extern int inet6_release(struct socket
*sock
);
552 extern int inet6_bind(struct socket
*sock
, struct sockaddr
*uaddr
,
554 extern int inet6_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
555 int *uaddr_len
, int peer
);
556 extern int inet6_ioctl(struct socket
*sock
, unsigned int cmd
,
559 extern int inet6_hash_connect(struct inet_timewait_death_row
*death_row
,
565 extern int sysctl_ip6frag_high_thresh
;
566 extern int sysctl_ip6frag_low_thresh
;
567 extern int sysctl_ip6frag_time
;
568 extern int sysctl_ip6frag_secret_interval
;
570 extern const struct proto_ops inet6_stream_ops
;
571 extern const struct proto_ops inet6_dgram_ops
;
573 struct group_source_req
;
576 extern int ip6_mc_source(int add
, int omode
, struct sock
*sk
,
577 struct group_source_req
*pgsr
);
578 extern int ip6_mc_msfilter(struct sock
*sk
, struct group_filter
*gsf
);
579 extern int ip6_mc_msfget(struct sock
*sk
, struct group_filter
*gsf
,
580 struct group_filter __user
*optval
,
583 #ifdef CONFIG_PROC_FS
584 extern int ac6_proc_init(void);
585 extern void ac6_proc_exit(void);
586 extern int raw6_proc_init(void);
587 extern void raw6_proc_exit(void);
588 extern int tcp6_proc_init(void);
589 extern void tcp6_proc_exit(void);
590 extern int udp6_proc_init(void);
591 extern void udp6_proc_exit(void);
592 extern int udplite6_proc_init(void);
593 extern void udplite6_proc_exit(void);
594 extern int ipv6_misc_proc_init(void);
595 extern void ipv6_misc_proc_exit(void);
596 extern int snmp6_register_dev(struct inet6_dev
*idev
);
597 extern int snmp6_unregister_dev(struct inet6_dev
*idev
);
599 extern struct rt6_statistics rt6_stats
;
601 static inline int snmp6_register_dev(struct inet6_dev
*idev
)
606 static inline int snmp6_unregister_dev(struct inet6_dev
*idev
)
613 extern ctl_table ipv6_route_table
[];
614 extern ctl_table ipv6_icmp_table
[];
616 extern void ipv6_sysctl_register(void);
617 extern void ipv6_sysctl_unregister(void);
620 #endif /* __KERNEL__ */
621 #endif /* _NET_IPV6_H */