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
;
115 #define _DEVINC(statname, modifier, idev, field) \
117 struct inet6_dev *_idev = (idev); \
118 if (likely(_idev != NULL)) \
119 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
120 SNMP_INC_STATS##modifier(statname##_statistics, (field)); \
123 #define _DEVADD(statname, modifier, idev, field, val) \
125 struct inet6_dev *_idev = (idev); \
126 if (likely(_idev != NULL)) \
127 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
128 SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
132 DECLARE_SNMP_STAT(struct ipstats_mib
, ipv6_statistics
);
134 #define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field)
135 #define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field)
136 #define IP6_INC_STATS_USER(idev,field) _DEVINC(ipv6, _USER, idev, field)
137 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
139 DECLARE_SNMP_STAT(struct icmpv6_mib
, icmpv6_statistics
);
140 DECLARE_SNMP_STAT(struct icmpv6msg_mib
, icmpv6msg_statistics
);
142 #define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field)
143 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
144 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
146 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
147 struct inet6_dev *_idev = idev; \
148 __typeof__(offset) _offset = (offset); \
149 if (likely(_idev != NULL)) \
150 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
151 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
154 #define ICMP6MSGOUT_INC_STATS(idev, field) \
155 _DEVINC(icmpv6msg, , idev, field +256)
156 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
157 _DEVINC(icmpv6msg, _BH, idev, field +256)
158 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
159 _DEVINC(icmpv6msg, _USER, idev, field +256)
160 #define ICMP6MSGIN_INC_STATS(idev, field) \
161 _DEVINC(icmpv6msg, , idev, field)
162 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
163 _DEVINC(icmpv6msg, _BH, idev, field)
164 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
165 _DEVINC(icmpv6msg, _USER, idev, field)
167 DECLARE_SNMP_STAT(struct udp_mib
, udp_stats_in6
);
168 DECLARE_SNMP_STAT(struct udp_mib
, udplite_stats_in6
);
169 #define UDP6_INC_STATS_BH(field, is_udplite) do { \
170 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \
171 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0)
172 #define UDP6_INC_STATS_USER(field, is_udplite) do { \
173 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \
174 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0)
178 struct ip6_ra_chain
*next
;
181 void (*destructor
)(struct sock
*);
184 extern struct ip6_ra_chain
*ip6_ra_chain
;
185 extern rwlock_t ip6_ra_lock
;
188 This structure is prepared by protocol, when parsing
189 ancillary data and passed to IPv6.
192 struct ipv6_txoptions
194 /* Length of this structure */
197 /* length of extension headers */
199 __u16 opt_flen
; /* after fragment hdr */
200 __u16 opt_nflen
; /* before fragment hdr */
202 struct ipv6_opt_hdr
*hopopt
;
203 struct ipv6_opt_hdr
*dst0opt
;
204 struct ipv6_rt_hdr
*srcrt
; /* Routing Header */
205 struct ipv6_opt_hdr
*dst1opt
;
207 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
212 struct ip6_flowlabel
*next
;
216 struct ipv6_txoptions
*opt
;
217 unsigned long linger
;
220 unsigned long lastuse
;
221 unsigned long expires
;
224 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
225 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
227 struct ipv6_fl_socklist
229 struct ipv6_fl_socklist
*next
;
230 struct ip6_flowlabel
*fl
;
233 extern struct ip6_flowlabel
*fl6_sock_lookup(struct sock
*sk
, __be32 label
);
234 extern struct ipv6_txoptions
*fl6_merge_options(struct ipv6_txoptions
* opt_space
,
235 struct ip6_flowlabel
* fl
,
236 struct ipv6_txoptions
* fopt
);
237 extern void fl6_free_socklist(struct sock
*sk
);
238 extern int ipv6_flowlabel_opt(struct sock
*sk
, char __user
*optval
, int optlen
);
239 extern void ip6_flowlabel_init(void);
240 extern void ip6_flowlabel_cleanup(void);
242 static inline void fl6_sock_release(struct ip6_flowlabel
*fl
)
245 atomic_dec(&fl
->users
);
248 extern int ip6_ra_control(struct sock
*sk
, int sel
,
249 void (*destructor
)(struct sock
*));
252 extern int ipv6_parse_hopopts(struct sk_buff
**skbp
);
254 extern struct ipv6_txoptions
* ipv6_dup_options(struct sock
*sk
, struct ipv6_txoptions
*opt
);
255 extern struct ipv6_txoptions
* ipv6_renew_options(struct sock
*sk
, struct ipv6_txoptions
*opt
,
257 struct ipv6_opt_hdr __user
*newopt
,
259 struct ipv6_txoptions
*ipv6_fixup_options(struct ipv6_txoptions
*opt_space
,
260 struct ipv6_txoptions
*opt
);
262 extern int ipv6_opt_accepted(struct sock
*sk
, struct sk_buff
*skb
);
264 int ip6_frag_nqueues(void);
265 int ip6_frag_mem(void);
267 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
270 * Function prototype for build_xmit
273 typedef int (*inet_getfrag_t
) (const void *data
,
274 struct in6_addr
*addr
,
276 unsigned int, unsigned int);
278 extern int __ipv6_addr_type(const struct in6_addr
*addr
);
279 static inline int ipv6_addr_type(const struct in6_addr
*addr
)
281 return __ipv6_addr_type(addr
) & 0xffff;
284 static inline int ipv6_addr_scope(const struct in6_addr
*addr
)
286 return __ipv6_addr_type(addr
) & IPV6_ADDR_SCOPE_MASK
;
289 static inline int __ipv6_addr_src_scope(int type
)
291 return (type
== IPV6_ADDR_ANY
? __IPV6_ADDR_SCOPE_INVALID
: (type
>> 16));
294 static inline int ipv6_addr_src_scope(const struct in6_addr
*addr
)
296 return __ipv6_addr_src_scope(__ipv6_addr_type(addr
));
299 static inline int ipv6_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
301 return memcmp(a1
, a2
, sizeof(struct in6_addr
));
305 ipv6_masked_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*m
,
306 const struct in6_addr
*a2
)
310 for (i
= 0; i
< 4; i
++)
311 if ((a1
->s6_addr32
[i
] ^ a2
->s6_addr32
[i
]) & m
->s6_addr32
[i
])
316 static inline void ipv6_addr_copy(struct in6_addr
*a1
, const struct in6_addr
*a2
)
318 memcpy(a1
, a2
, sizeof(struct in6_addr
));
321 static inline void ipv6_addr_prefix(struct in6_addr
*pfx
,
322 const struct in6_addr
*addr
,
325 /* caller must guarantee 0 <= plen <= 128 */
329 memset(pfx
->s6_addr
, 0, sizeof(pfx
->s6_addr
));
330 memcpy(pfx
->s6_addr
, addr
, o
);
332 pfx
->s6_addr
[o
] = addr
->s6_addr
[o
] & (0xff00 >> b
);
335 static inline void ipv6_addr_set(struct in6_addr
*addr
,
336 __be32 w1
, __be32 w2
,
337 __be32 w3
, __be32 w4
)
339 addr
->s6_addr32
[0] = w1
;
340 addr
->s6_addr32
[1] = w2
;
341 addr
->s6_addr32
[2] = w3
;
342 addr
->s6_addr32
[3] = w4
;
345 static inline int ipv6_addr_equal(const struct in6_addr
*a1
,
346 const struct in6_addr
*a2
)
348 return (a1
->s6_addr32
[0] == a2
->s6_addr32
[0] &&
349 a1
->s6_addr32
[1] == a2
->s6_addr32
[1] &&
350 a1
->s6_addr32
[2] == a2
->s6_addr32
[2] &&
351 a1
->s6_addr32
[3] == a2
->s6_addr32
[3]);
354 static inline int __ipv6_prefix_equal(const __be32
*a1
, const __be32
*a2
,
355 unsigned int prefixlen
)
359 /* check complete u32 in prefix */
360 pdw
= prefixlen
>> 5;
361 if (pdw
&& memcmp(a1
, a2
, pdw
<< 2))
364 /* check incomplete u32 in prefix */
365 pbi
= prefixlen
& 0x1f;
366 if (pbi
&& ((a1
[pdw
] ^ a2
[pdw
]) & htonl((0xffffffff) << (32 - pbi
))))
372 static inline int ipv6_prefix_equal(const struct in6_addr
*a1
,
373 const struct in6_addr
*a2
,
374 unsigned int prefixlen
)
376 return __ipv6_prefix_equal(a1
->s6_addr32
, a2
->s6_addr32
,
380 static inline int ipv6_addr_any(const struct in6_addr
*a
)
382 return ((a
->s6_addr32
[0] | a
->s6_addr32
[1] |
383 a
->s6_addr32
[2] | a
->s6_addr32
[3] ) == 0);
386 static inline int ipv6_addr_v4mapped(const struct in6_addr
*a
)
388 return ((a
->s6_addr32
[0] | a
->s6_addr32
[1]) == 0 &&
389 a
->s6_addr32
[2] == htonl(0x0000ffff));
393 * find the first different bit between two addresses
394 * length of address must be a multiple of 32bits
396 static inline int __ipv6_addr_diff(const void *token1
, const void *token2
, int addrlen
)
398 const __be32
*a1
= token1
, *a2
= token2
;
403 for (i
= 0; i
< addrlen
; i
++) {
404 __be32 xb
= a1
[i
] ^ a2
[i
];
406 return i
* 32 + 32 - fls(ntohl(xb
));
410 * we should *never* get to this point since that
411 * would mean the addrs are equal
413 * However, we do get to it 8) And exacly, when
414 * addresses are equal 8)
416 * ip route add 1111::/128 via ...
417 * ip route add 1111::/64 via ...
420 * Ideally, this function should stop comparison
421 * at prefix length. It does not, but it is still OK,
422 * if returned value is greater than prefix length.
425 return (addrlen
<< 5);
428 static inline int ipv6_addr_diff(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
430 return __ipv6_addr_diff(a1
, a2
, sizeof(struct in6_addr
));
434 * Prototypes exported by ipv6
438 * rcv function (called from netdevice level)
441 extern int ipv6_rcv(struct sk_buff
*skb
,
442 struct net_device
*dev
,
443 struct packet_type
*pt
,
444 struct net_device
*orig_dev
);
446 extern int ip6_rcv_finish(struct sk_buff
*skb
);
449 * upper-layer output functions
451 extern int ip6_xmit(struct sock
*sk
,
454 struct ipv6_txoptions
*opt
,
457 extern int ip6_nd_hdr(struct sock
*sk
,
459 struct net_device
*dev
,
460 struct in6_addr
*saddr
,
461 struct in6_addr
*daddr
,
464 extern int ip6_find_1stfragopt(struct sk_buff
*skb
, u8
**nexthdr
);
466 extern int ip6_append_data(struct sock
*sk
,
467 int getfrag(void *from
, char *to
, int offset
, int len
, int odd
, struct sk_buff
*skb
),
473 struct ipv6_txoptions
*opt
,
478 extern int ip6_push_pending_frames(struct sock
*sk
);
480 extern void ip6_flush_pending_frames(struct sock
*sk
);
482 extern int ip6_dst_lookup(struct sock
*sk
,
483 struct dst_entry
**dst
,
485 extern int ip6_dst_blackhole(struct sock
*sk
,
486 struct dst_entry
**dst
,
488 extern int ip6_sk_dst_lookup(struct sock
*sk
,
489 struct dst_entry
**dst
,
493 * skb processing functions
496 extern int ip6_output(struct sk_buff
*skb
);
497 extern int ip6_forward(struct sk_buff
*skb
);
498 extern int ip6_input(struct sk_buff
*skb
);
499 extern int ip6_mc_input(struct sk_buff
*skb
);
502 * Extension header (options) processing
505 extern u8
* ipv6_build_nfrag_opts(struct sk_buff
*skb
,
507 struct ipv6_txoptions
*opt
,
508 struct in6_addr
*daddr
,
510 extern u8
* ipv6_build_frag_opts(struct sk_buff
*skb
,
512 struct ipv6_txoptions
*opt
);
513 extern void ipv6_push_nfrag_opts(struct sk_buff
*skb
,
514 struct ipv6_txoptions
*opt
,
516 struct in6_addr
**daddr_p
);
517 extern void ipv6_push_frag_opts(struct sk_buff
*skb
,
518 struct ipv6_txoptions
*opt
,
521 extern int ipv6_skip_exthdr(const struct sk_buff
*, int start
,
524 extern int ipv6_ext_hdr(u8 nexthdr
);
526 extern int ipv6_find_tlv(struct sk_buff
*skb
, int offset
, int type
);
529 * socket options (ipv6_sockglue.c)
532 extern int ipv6_setsockopt(struct sock
*sk
, int level
,
536 extern int ipv6_getsockopt(struct sock
*sk
, int level
,
540 extern int compat_ipv6_setsockopt(struct sock
*sk
,
545 extern int compat_ipv6_getsockopt(struct sock
*sk
,
551 extern void ipv6_packet_init(void);
553 extern void ipv6_packet_cleanup(void);
555 extern int ip6_datagram_connect(struct sock
*sk
,
556 struct sockaddr
*addr
, int addr_len
);
558 extern int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
);
559 extern void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
, __be16 port
,
560 u32 info
, u8
*payload
);
561 extern void ipv6_local_error(struct sock
*sk
, int err
, struct flowi
*fl
, u32 info
);
563 extern int inet6_release(struct socket
*sock
);
564 extern int inet6_bind(struct socket
*sock
, struct sockaddr
*uaddr
,
566 extern int inet6_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
567 int *uaddr_len
, int peer
);
568 extern int inet6_ioctl(struct socket
*sock
, unsigned int cmd
,
571 extern int inet6_hash_connect(struct inet_timewait_death_row
*death_row
,
577 struct inet_frags_ctl
;
578 extern struct inet_frags_ctl ip6_frags_ctl
;
580 extern const struct proto_ops inet6_stream_ops
;
581 extern const struct proto_ops inet6_dgram_ops
;
583 struct group_source_req
;
586 extern int ip6_mc_source(int add
, int omode
, struct sock
*sk
,
587 struct group_source_req
*pgsr
);
588 extern int ip6_mc_msfilter(struct sock
*sk
, struct group_filter
*gsf
);
589 extern int ip6_mc_msfget(struct sock
*sk
, struct group_filter
*gsf
,
590 struct group_filter __user
*optval
,
593 #ifdef CONFIG_PROC_FS
594 extern int ac6_proc_init(void);
595 extern void ac6_proc_exit(void);
596 extern int raw6_proc_init(void);
597 extern void raw6_proc_exit(void);
598 extern int tcp6_proc_init(void);
599 extern void tcp6_proc_exit(void);
600 extern int udp6_proc_init(void);
601 extern void udp6_proc_exit(void);
602 extern int udplite6_proc_init(void);
603 extern void udplite6_proc_exit(void);
604 extern int ipv6_misc_proc_init(void);
605 extern void ipv6_misc_proc_exit(void);
606 extern int snmp6_register_dev(struct inet6_dev
*idev
);
607 extern int snmp6_unregister_dev(struct inet6_dev
*idev
);
609 extern struct rt6_statistics rt6_stats
;
611 static inline int snmp6_register_dev(struct inet6_dev
*idev
)
616 static inline int snmp6_unregister_dev(struct inet6_dev
*idev
)
623 extern ctl_table ipv6_route_table
[];
624 extern ctl_table ipv6_icmp_table
[];
626 extern void ipv6_sysctl_register(void);
627 extern void ipv6_sysctl_unregister(void);
630 #endif /* __KERNEL__ */
631 #endif /* _NET_IPV6_H */