2 * Linux INET6 implementation
5 * Pedro Roque <roque@di.fc.ul.pt>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
16 #include <linux/ipv6.h>
17 #include <linux/hardirq.h>
18 #include <net/if_inet6.h>
19 #include <net/ndisc.h>
23 #define SIN6_LEN_RFC2133 24
25 #define IPV6_MAXPLEN 65535
28 * NextHeader field of IPv6 header
31 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
32 #define NEXTHDR_TCP 6 /* TCP segment. */
33 #define NEXTHDR_UDP 17 /* UDP message. */
34 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
35 #define NEXTHDR_ROUTING 43 /* Routing header. */
36 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
37 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
38 #define NEXTHDR_AUTH 51 /* Authentication header. */
39 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
40 #define NEXTHDR_NONE 59 /* No next header */
41 #define NEXTHDR_DEST 60 /* Destination options header. */
42 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
44 #define NEXTHDR_MAX 255
48 #define IPV6_DEFAULT_HOPLIMIT 64
49 #define IPV6_DEFAULT_MCASTHOPS 1
54 * type - unicast | multicast
55 * scope - local | site | global
62 #define IPV6_ADDR_ANY 0x0000U
64 #define IPV6_ADDR_UNICAST 0x0001U
65 #define IPV6_ADDR_MULTICAST 0x0002U
67 #define IPV6_ADDR_LOOPBACK 0x0010U
68 #define IPV6_ADDR_LINKLOCAL 0x0020U
69 #define IPV6_ADDR_SITELOCAL 0x0040U
71 #define IPV6_ADDR_COMPATv4 0x0080U
73 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
75 #define IPV6_ADDR_MAPPED 0x1000U
76 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
82 #define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84 #define __IPV6_ADDR_SCOPE_INVALID -1
86 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
87 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
88 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
89 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
90 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
93 * fragmentation header
100 __be32 identification
;
103 #define IP6_MF 0x0001
107 #include <net/sock.h>
110 extern int sysctl_mld_max_msf
;
111 extern struct ctl_path net_ipv6_ctl_path
[];
113 #define _DEVINC(net, statname, modifier, idev, field) \
115 struct inet6_dev *_idev = (idev); \
116 if (likely(_idev != NULL)) \
117 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
118 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
121 #define _DEVADD(net, statname, modifier, idev, field, val) \
123 struct inet6_dev *_idev = (idev); \
124 if (likely(_idev != NULL)) \
125 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
126 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
129 #define _DEVUPD(net, statname, modifier, idev, field, val) \
131 struct inet6_dev *_idev = (idev); \
132 if (likely(_idev != NULL)) \
133 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
134 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
139 #define IP6_INC_STATS(net, idev,field) \
140 _DEVINC(net, ipv6, , idev, field)
141 #define IP6_INC_STATS_BH(net, idev,field) \
142 _DEVINC(net, ipv6, _BH, idev, field)
143 #define IP6_ADD_STATS(net, idev,field,val) \
144 _DEVADD(net, ipv6, , idev, field, val)
145 #define IP6_ADD_STATS_BH(net, idev,field,val) \
146 _DEVADD(net, ipv6, _BH, idev, field, val)
147 #define IP6_UPD_PO_STATS(net, idev,field,val) \
148 _DEVUPD(net, ipv6, , idev, field, val)
149 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
150 _DEVUPD(net, ipv6, _BH, idev, field, val)
151 #define ICMP6_INC_STATS(net, idev, field) \
152 _DEVINC(net, icmpv6, , idev, field)
153 #define ICMP6_INC_STATS_BH(net, idev, field) \
154 _DEVINC(net, icmpv6, _BH, idev, field)
156 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
157 _DEVINC(net, icmpv6msg, , idev, field +256)
158 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
159 _DEVINC(net, icmpv6msg, _BH, idev, field +256)
160 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
161 _DEVINC(net, icmpv6msg, _BH, idev, field)
165 struct ip6_ra_chain
*next
;
168 void (*destructor
)(struct sock
*);
171 extern struct ip6_ra_chain
*ip6_ra_chain
;
172 extern rwlock_t ip6_ra_lock
;
175 This structure is prepared by protocol, when parsing
176 ancillary data and passed to IPv6.
179 struct ipv6_txoptions
181 /* Length of this structure */
184 /* length of extension headers */
186 __u16 opt_flen
; /* after fragment hdr */
187 __u16 opt_nflen
; /* before fragment hdr */
189 struct ipv6_opt_hdr
*hopopt
;
190 struct ipv6_opt_hdr
*dst0opt
;
191 struct ipv6_rt_hdr
*srcrt
; /* Routing Header */
192 struct ipv6_opt_hdr
*dst1opt
;
194 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
199 struct ip6_flowlabel
*next
;
203 struct ipv6_txoptions
*opt
;
204 unsigned long linger
;
207 unsigned long lastuse
;
208 unsigned long expires
;
212 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
213 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
215 struct ipv6_fl_socklist
217 struct ipv6_fl_socklist
*next
;
218 struct ip6_flowlabel
*fl
;
221 extern struct ip6_flowlabel
*fl6_sock_lookup(struct sock
*sk
, __be32 label
);
222 extern struct ipv6_txoptions
*fl6_merge_options(struct ipv6_txoptions
* opt_space
,
223 struct ip6_flowlabel
* fl
,
224 struct ipv6_txoptions
* fopt
);
225 extern void fl6_free_socklist(struct sock
*sk
);
226 extern int ipv6_flowlabel_opt(struct sock
*sk
, char __user
*optval
, int optlen
);
227 extern int ip6_flowlabel_init(void);
228 extern void ip6_flowlabel_cleanup(void);
230 static inline void fl6_sock_release(struct ip6_flowlabel
*fl
)
233 atomic_dec(&fl
->users
);
236 extern int ip6_ra_control(struct sock
*sk
, int sel
);
238 extern int ipv6_parse_hopopts(struct sk_buff
*skb
);
240 extern struct ipv6_txoptions
* ipv6_dup_options(struct sock
*sk
, struct ipv6_txoptions
*opt
);
241 extern struct ipv6_txoptions
* ipv6_renew_options(struct sock
*sk
, struct ipv6_txoptions
*opt
,
243 struct ipv6_opt_hdr __user
*newopt
,
245 struct ipv6_txoptions
*ipv6_fixup_options(struct ipv6_txoptions
*opt_space
,
246 struct ipv6_txoptions
*opt
);
248 extern int ipv6_opt_accepted(struct sock
*sk
, struct sk_buff
*skb
);
250 int ip6_frag_nqueues(struct net
*net
);
251 int ip6_frag_mem(struct net
*net
);
253 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
255 extern int __ipv6_addr_type(const struct in6_addr
*addr
);
256 static inline int ipv6_addr_type(const struct in6_addr
*addr
)
258 return __ipv6_addr_type(addr
) & 0xffff;
261 static inline int ipv6_addr_scope(const struct in6_addr
*addr
)
263 return __ipv6_addr_type(addr
) & IPV6_ADDR_SCOPE_MASK
;
266 static inline int __ipv6_addr_src_scope(int type
)
268 return (type
== IPV6_ADDR_ANY
? __IPV6_ADDR_SCOPE_INVALID
: (type
>> 16));
271 static inline int ipv6_addr_src_scope(const struct in6_addr
*addr
)
273 return __ipv6_addr_src_scope(__ipv6_addr_type(addr
));
276 static inline int ipv6_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
278 return memcmp(a1
, a2
, sizeof(struct in6_addr
));
282 ipv6_masked_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*m
,
283 const struct in6_addr
*a2
)
285 return (!!(((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) & m
->s6_addr32
[0]) |
286 ((a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) & m
->s6_addr32
[1]) |
287 ((a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) & m
->s6_addr32
[2]) |
288 ((a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3]) & m
->s6_addr32
[3])));
291 static inline void ipv6_addr_copy(struct in6_addr
*a1
, const struct in6_addr
*a2
)
293 memcpy(a1
, a2
, sizeof(struct in6_addr
));
296 static inline void ipv6_addr_prefix(struct in6_addr
*pfx
,
297 const struct in6_addr
*addr
,
300 /* caller must guarantee 0 <= plen <= 128 */
304 memset(pfx
->s6_addr
, 0, sizeof(pfx
->s6_addr
));
305 memcpy(pfx
->s6_addr
, addr
, o
);
307 pfx
->s6_addr
[o
] = addr
->s6_addr
[o
] & (0xff00 >> b
);
310 static inline void ipv6_addr_set(struct in6_addr
*addr
,
311 __be32 w1
, __be32 w2
,
312 __be32 w3
, __be32 w4
)
314 addr
->s6_addr32
[0] = w1
;
315 addr
->s6_addr32
[1] = w2
;
316 addr
->s6_addr32
[2] = w3
;
317 addr
->s6_addr32
[3] = w4
;
320 static inline int ipv6_addr_equal(const struct in6_addr
*a1
,
321 const struct in6_addr
*a2
)
323 return (((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) |
324 (a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) |
325 (a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) |
326 (a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3])) == 0);
329 static inline int __ipv6_prefix_equal(const __be32
*a1
, const __be32
*a2
,
330 unsigned int prefixlen
)
334 /* check complete u32 in prefix */
335 pdw
= prefixlen
>> 5;
336 if (pdw
&& memcmp(a1
, a2
, pdw
<< 2))
339 /* check incomplete u32 in prefix */
340 pbi
= prefixlen
& 0x1f;
341 if (pbi
&& ((a1
[pdw
] ^ a2
[pdw
]) & htonl((0xffffffff) << (32 - pbi
))))
347 static inline int ipv6_prefix_equal(const struct in6_addr
*a1
,
348 const struct in6_addr
*a2
,
349 unsigned int prefixlen
)
351 return __ipv6_prefix_equal(a1
->s6_addr32
, a2
->s6_addr32
,
355 struct inet_frag_queue
;
357 enum ip6_defrag_users
{
358 IP6_DEFRAG_LOCAL_DELIVER
,
359 IP6_DEFRAG_CONNTRACK_IN
,
360 IP6_DEFRAG_CONNTRACK_OUT
,
363 struct ip6_create_arg
{
366 struct in6_addr
*src
;
367 struct in6_addr
*dst
;
370 void ip6_frag_init(struct inet_frag_queue
*q
, void *a
);
371 int ip6_frag_match(struct inet_frag_queue
*q
, void *a
);
373 static inline int ipv6_addr_any(const struct in6_addr
*a
)
375 return ((a
->s6_addr32
[0] | a
->s6_addr32
[1] |
376 a
->s6_addr32
[2] | a
->s6_addr32
[3] ) == 0);
379 static inline int ipv6_addr_loopback(const struct in6_addr
*a
)
381 return ((a
->s6_addr32
[0] | a
->s6_addr32
[1] |
382 a
->s6_addr32
[2] | (a
->s6_addr32
[3] ^ htonl(1))) == 0);
385 static inline int ipv6_addr_v4mapped(const struct in6_addr
*a
)
387 return ((a
->s6_addr32
[0] | a
->s6_addr32
[1] |
388 (a
->s6_addr32
[2] ^ htonl(0x0000ffff))) == 0);
392 * Check for a RFC 4843 ORCHID address
393 * (Overlay Routable Cryptographic Hash Identifiers)
395 static inline int ipv6_addr_orchid(const struct in6_addr
*a
)
397 return ((a
->s6_addr32
[0] & htonl(0xfffffff0))
398 == htonl(0x20010010));
401 static inline void ipv6_addr_set_v4mapped(const __be32 addr
,
402 struct in6_addr
*v4mapped
)
404 ipv6_addr_set(v4mapped
,
411 * find the first different bit between two addresses
412 * length of address must be a multiple of 32bits
414 static inline int __ipv6_addr_diff(const void *token1
, const void *token2
, int addrlen
)
416 const __be32
*a1
= token1
, *a2
= token2
;
421 for (i
= 0; i
< addrlen
; i
++) {
422 __be32 xb
= a1
[i
] ^ a2
[i
];
424 return i
* 32 + 32 - fls(ntohl(xb
));
428 * we should *never* get to this point since that
429 * would mean the addrs are equal
431 * However, we do get to it 8) And exacly, when
432 * addresses are equal 8)
434 * ip route add 1111::/128 via ...
435 * ip route add 1111::/64 via ...
438 * Ideally, this function should stop comparison
439 * at prefix length. It does not, but it is still OK,
440 * if returned value is greater than prefix length.
443 return (addrlen
<< 5);
446 static inline int ipv6_addr_diff(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
448 return __ipv6_addr_diff(a1
, a2
, sizeof(struct in6_addr
));
452 * Prototypes exported by ipv6
456 * rcv function (called from netdevice level)
459 extern int ipv6_rcv(struct sk_buff
*skb
,
460 struct net_device
*dev
,
461 struct packet_type
*pt
,
462 struct net_device
*orig_dev
);
464 extern int ip6_rcv_finish(struct sk_buff
*skb
);
467 * upper-layer output functions
469 extern int ip6_xmit(struct sock
*sk
,
472 struct ipv6_txoptions
*opt
,
475 extern int ip6_nd_hdr(struct sock
*sk
,
477 struct net_device
*dev
,
478 const struct in6_addr
*saddr
,
479 const struct in6_addr
*daddr
,
482 extern int ip6_find_1stfragopt(struct sk_buff
*skb
, u8
**nexthdr
);
484 extern int ip6_append_data(struct sock
*sk
,
485 int getfrag(void *from
, char *to
, int offset
, int len
, int odd
, struct sk_buff
*skb
),
491 struct ipv6_txoptions
*opt
,
496 extern int ip6_push_pending_frames(struct sock
*sk
);
498 extern void ip6_flush_pending_frames(struct sock
*sk
);
500 extern int ip6_dst_lookup(struct sock
*sk
,
501 struct dst_entry
**dst
,
503 extern int ip6_dst_blackhole(struct sock
*sk
,
504 struct dst_entry
**dst
,
506 extern int ip6_sk_dst_lookup(struct sock
*sk
,
507 struct dst_entry
**dst
,
511 * skb processing functions
514 extern int ip6_output(struct sk_buff
*skb
);
515 extern int ip6_forward(struct sk_buff
*skb
);
516 extern int ip6_input(struct sk_buff
*skb
);
517 extern int ip6_mc_input(struct sk_buff
*skb
);
519 extern int __ip6_local_out(struct sk_buff
*skb
);
520 extern int ip6_local_out(struct sk_buff
*skb
);
523 * Extension header (options) processing
526 extern void ipv6_push_nfrag_opts(struct sk_buff
*skb
,
527 struct ipv6_txoptions
*opt
,
529 struct in6_addr
**daddr_p
);
530 extern void ipv6_push_frag_opts(struct sk_buff
*skb
,
531 struct ipv6_txoptions
*opt
,
534 extern int ipv6_skip_exthdr(const struct sk_buff
*, int start
,
537 extern int ipv6_ext_hdr(u8 nexthdr
);
539 extern int ipv6_find_tlv(struct sk_buff
*skb
, int offset
, int type
);
542 * socket options (ipv6_sockglue.c)
545 extern int ipv6_setsockopt(struct sock
*sk
, int level
,
549 extern int ipv6_getsockopt(struct sock
*sk
, int level
,
553 extern int compat_ipv6_setsockopt(struct sock
*sk
,
558 extern int compat_ipv6_getsockopt(struct sock
*sk
,
564 extern int ip6_datagram_connect(struct sock
*sk
,
565 struct sockaddr
*addr
, int addr_len
);
567 extern int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
);
568 extern void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
, __be16 port
,
569 u32 info
, u8
*payload
);
570 extern void ipv6_local_error(struct sock
*sk
, int err
, struct flowi
*fl
, u32 info
);
572 extern int inet6_release(struct socket
*sock
);
573 extern int inet6_bind(struct socket
*sock
, struct sockaddr
*uaddr
,
575 extern int inet6_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
576 int *uaddr_len
, int peer
);
577 extern int inet6_ioctl(struct socket
*sock
, unsigned int cmd
,
580 extern int inet6_hash_connect(struct inet_timewait_death_row
*death_row
,
586 extern const struct proto_ops inet6_stream_ops
;
587 extern const struct proto_ops inet6_dgram_ops
;
589 struct group_source_req
;
592 extern int ip6_mc_source(int add
, int omode
, struct sock
*sk
,
593 struct group_source_req
*pgsr
);
594 extern int ip6_mc_msfilter(struct sock
*sk
, struct group_filter
*gsf
);
595 extern int ip6_mc_msfget(struct sock
*sk
, struct group_filter
*gsf
,
596 struct group_filter __user
*optval
,
598 extern unsigned int inet6_hash_frag(__be32 id
, const struct in6_addr
*saddr
,
599 const struct in6_addr
*daddr
, u32 rnd
);
601 #ifdef CONFIG_PROC_FS
602 extern int ac6_proc_init(struct net
*net
);
603 extern void ac6_proc_exit(struct net
*net
);
604 extern int raw6_proc_init(void);
605 extern void raw6_proc_exit(void);
606 extern int tcp6_proc_init(struct net
*net
);
607 extern void tcp6_proc_exit(struct net
*net
);
608 extern int udp6_proc_init(struct net
*net
);
609 extern void udp6_proc_exit(struct net
*net
);
610 extern int udplite6_proc_init(void);
611 extern void udplite6_proc_exit(void);
612 extern int ipv6_misc_proc_init(void);
613 extern void ipv6_misc_proc_exit(void);
614 extern int snmp6_register_dev(struct inet6_dev
*idev
);
615 extern int snmp6_unregister_dev(struct inet6_dev
*idev
);
618 static inline int ac6_proc_init(struct net
*net
) { return 0; }
619 static inline void ac6_proc_exit(struct net
*net
) { }
620 static inline int snmp6_register_dev(struct inet6_dev
*idev
) { return 0; }
621 static inline int snmp6_unregister_dev(struct inet6_dev
*idev
) { return 0; }
625 extern ctl_table ipv6_route_table_template
[];
626 extern ctl_table ipv6_icmp_table_template
[];
628 extern struct ctl_table
*ipv6_icmp_sysctl_init(struct net
*net
);
629 extern struct ctl_table
*ipv6_route_sysctl_init(struct net
*net
);
630 extern int ipv6_sysctl_register(void);
631 extern void ipv6_sysctl_unregister(void);
632 extern int ipv6_static_sysctl_register(void);
633 extern void ipv6_static_sysctl_unregister(void);
636 #endif /* __KERNEL__ */
637 #endif /* _NET_IPV6_H */