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 <linux/jhash.h>
19 #include <net/if_inet6.h>
20 #include <net/ndisc.h>
24 #define SIN6_LEN_RFC2133 24
26 #define IPV6_MAXPLEN 65535
29 * NextHeader field of IPv6 header
32 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
33 #define NEXTHDR_TCP 6 /* TCP segment. */
34 #define NEXTHDR_UDP 17 /* UDP message. */
35 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
36 #define NEXTHDR_ROUTING 43 /* Routing header. */
37 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
38 #define NEXTHDR_GRE 47 /* GRE 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
82 #define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84 #define __IPV6_ADDR_SCOPE_INVALID -1
85 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
86 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
87 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
88 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
89 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
94 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
95 ((a)->s6_addr[1] & 0x10)
96 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
97 ((a)->s6_addr[1] & 0x20)
98 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
99 ((a)->s6_addr[1] & 0x40)
102 * fragmentation header
109 __be32 identification
;
112 #define IP6_MF 0x0001
114 #define IP6_REPLY_MARK(net, mark) \
115 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
117 #include <net/sock.h>
120 extern int sysctl_mld_max_msf
;
122 #define _DEVINC(net, statname, modifier, idev, field) \
124 struct inet6_dev *_idev = (idev); \
125 if (likely(_idev != NULL)) \
126 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
127 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
130 /* per device counters are atomic_long_t */
131 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \
133 struct inet6_dev *_idev = (idev); \
134 if (likely(_idev != NULL)) \
135 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
136 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
139 /* per device and per net counters are atomic_long_t */
140 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
142 struct inet6_dev *_idev = (idev); \
143 if (likely(_idev != NULL)) \
144 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
145 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
148 #define _DEVADD(net, statname, modifier, idev, field, val) \
150 struct inet6_dev *_idev = (idev); \
151 if (likely(_idev != NULL)) \
152 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
153 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
156 #define _DEVUPD(net, statname, modifier, idev, field, val) \
158 struct inet6_dev *_idev = (idev); \
159 if (likely(_idev != NULL)) \
160 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
161 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
166 #define IP6_INC_STATS(net, idev,field) \
167 _DEVINC(net, ipv6, 64, idev, field)
168 #define IP6_INC_STATS_BH(net, idev,field) \
169 _DEVINC(net, ipv6, 64_BH, idev, field)
170 #define IP6_ADD_STATS(net, idev,field,val) \
171 _DEVADD(net, ipv6, 64, idev, field, val)
172 #define IP6_ADD_STATS_BH(net, idev,field,val) \
173 _DEVADD(net, ipv6, 64_BH, idev, field, val)
174 #define IP6_UPD_PO_STATS(net, idev,field,val) \
175 _DEVUPD(net, ipv6, 64, idev, field, val)
176 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
177 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
178 #define ICMP6_INC_STATS(net, idev, field) \
179 _DEVINCATOMIC(net, icmpv6, , idev, field)
180 #define ICMP6_INC_STATS_BH(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
183 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
185 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
190 struct ip6_ra_chain
{
191 struct ip6_ra_chain
*next
;
194 void (*destructor
)(struct sock
*);
197 extern struct ip6_ra_chain
*ip6_ra_chain
;
198 extern rwlock_t ip6_ra_lock
;
201 This structure is prepared by protocol, when parsing
202 ancillary data and passed to IPv6.
205 struct ipv6_txoptions
{
206 /* Length of this structure */
209 /* length of extension headers */
211 __u16 opt_flen
; /* after fragment hdr */
212 __u16 opt_nflen
; /* before fragment hdr */
214 struct ipv6_opt_hdr
*hopopt
;
215 struct ipv6_opt_hdr
*dst0opt
;
216 struct ipv6_rt_hdr
*srcrt
; /* Routing Header */
217 struct ipv6_opt_hdr
*dst1opt
;
219 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
222 struct ip6_flowlabel
{
223 struct ip6_flowlabel __rcu
*next
;
227 struct ipv6_txoptions
*opt
;
228 unsigned long linger
;
235 unsigned long lastuse
;
236 unsigned long expires
;
240 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
241 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
243 struct ipv6_fl_socklist
{
244 struct ipv6_fl_socklist __rcu
*next
;
245 struct ip6_flowlabel
*fl
;
249 extern struct ip6_flowlabel
*fl6_sock_lookup(struct sock
*sk
, __be32 label
);
250 extern struct ipv6_txoptions
*fl6_merge_options(struct ipv6_txoptions
* opt_space
,
251 struct ip6_flowlabel
* fl
,
252 struct ipv6_txoptions
* fopt
);
253 extern void fl6_free_socklist(struct sock
*sk
);
254 extern int ipv6_flowlabel_opt(struct sock
*sk
, char __user
*optval
, int optlen
);
255 extern int ip6_flowlabel_init(void);
256 extern void ip6_flowlabel_cleanup(void);
258 static inline void fl6_sock_release(struct ip6_flowlabel
*fl
)
261 atomic_dec(&fl
->users
);
264 extern void icmpv6_notify(struct sk_buff
*skb
, u8 type
, u8 code
, __be32 info
);
266 int icmpv6_push_pending_frames(struct sock
*sk
, struct flowi6
*fl6
,
267 struct icmp6hdr
*thdr
, int len
);
269 struct dst_entry
*icmpv6_route_lookup(struct net
*net
, struct sk_buff
*skb
,
270 struct sock
*sk
, struct flowi6
*fl6
);
272 extern int ip6_ra_control(struct sock
*sk
, int sel
);
274 extern int ipv6_parse_hopopts(struct sk_buff
*skb
);
276 extern struct ipv6_txoptions
* ipv6_dup_options(struct sock
*sk
, struct ipv6_txoptions
*opt
);
277 extern struct ipv6_txoptions
* ipv6_renew_options(struct sock
*sk
, struct ipv6_txoptions
*opt
,
279 struct ipv6_opt_hdr __user
*newopt
,
281 struct ipv6_txoptions
*ipv6_fixup_options(struct ipv6_txoptions
*opt_space
,
282 struct ipv6_txoptions
*opt
);
284 extern bool ipv6_opt_accepted(const struct sock
*sk
, const struct sk_buff
*skb
);
286 static inline bool ipv6_accept_ra(struct inet6_dev
*idev
)
288 /* If forwarding is enabled, RA are not accepted unless the special
289 * hybrid mode (accept_ra=2) is enabled.
291 return idev
->cnf
.forwarding
? idev
->cnf
.accept_ra
== 2 :
295 #if IS_ENABLED(CONFIG_IPV6)
296 static inline int ip6_frag_nqueues(struct net
*net
)
298 return net
->ipv6
.frags
.nqueues
;
301 static inline int ip6_frag_mem(struct net
*net
)
303 return sum_frag_mem_limit(&net
->ipv6
.frags
);
307 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
308 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
309 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
311 extern int __ipv6_addr_type(const struct in6_addr
*addr
);
312 static inline int ipv6_addr_type(const struct in6_addr
*addr
)
314 return __ipv6_addr_type(addr
) & 0xffff;
317 static inline int ipv6_addr_scope(const struct in6_addr
*addr
)
319 return __ipv6_addr_type(addr
) & IPV6_ADDR_SCOPE_MASK
;
322 static inline int __ipv6_addr_src_scope(int type
)
324 return (type
== IPV6_ADDR_ANY
) ? __IPV6_ADDR_SCOPE_INVALID
: (type
>> 16);
327 static inline int ipv6_addr_src_scope(const struct in6_addr
*addr
)
329 return __ipv6_addr_src_scope(__ipv6_addr_type(addr
));
332 static inline bool __ipv6_addr_needs_scope_id(int type
)
334 return type
& IPV6_ADDR_LINKLOCAL
||
335 (type
& IPV6_ADDR_MULTICAST
&&
336 (type
& (IPV6_ADDR_LOOPBACK
|IPV6_ADDR_LINKLOCAL
)));
339 static inline __u32
ipv6_iface_scope_id(const struct in6_addr
*addr
, int iface
)
341 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr
)) ? iface
: 0;
344 static inline int ipv6_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
346 return memcmp(a1
, a2
, sizeof(struct in6_addr
));
350 ipv6_masked_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*m
,
351 const struct in6_addr
*a2
)
353 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
354 const unsigned long *ul1
= (const unsigned long *)a1
;
355 const unsigned long *ulm
= (const unsigned long *)m
;
356 const unsigned long *ul2
= (const unsigned long *)a2
;
358 return !!(((ul1
[0] ^ ul2
[0]) & ulm
[0]) |
359 ((ul1
[1] ^ ul2
[1]) & ulm
[1]));
361 return !!(((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) & m
->s6_addr32
[0]) |
362 ((a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) & m
->s6_addr32
[1]) |
363 ((a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) & m
->s6_addr32
[2]) |
364 ((a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3]) & m
->s6_addr32
[3]));
368 static inline void ipv6_addr_prefix(struct in6_addr
*pfx
,
369 const struct in6_addr
*addr
,
372 /* caller must guarantee 0 <= plen <= 128 */
376 memset(pfx
->s6_addr
, 0, sizeof(pfx
->s6_addr
));
377 memcpy(pfx
->s6_addr
, addr
, o
);
379 pfx
->s6_addr
[o
] = addr
->s6_addr
[o
] & (0xff00 >> b
);
382 static inline void __ipv6_addr_set_half(__be32
*addr
,
383 __be32 wh
, __be32 wl
)
385 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
386 #if defined(__BIG_ENDIAN)
387 if (__builtin_constant_p(wh
) && __builtin_constant_p(wl
)) {
388 *(__force u64
*)addr
= ((__force u64
)(wh
) << 32 | (__force u64
)(wl
));
391 #elif defined(__LITTLE_ENDIAN)
392 if (__builtin_constant_p(wl
) && __builtin_constant_p(wh
)) {
393 *(__force u64
*)addr
= ((__force u64
)(wl
) << 32 | (__force u64
)(wh
));
402 static inline void ipv6_addr_set(struct in6_addr
*addr
,
403 __be32 w1
, __be32 w2
,
404 __be32 w3
, __be32 w4
)
406 __ipv6_addr_set_half(&addr
->s6_addr32
[0], w1
, w2
);
407 __ipv6_addr_set_half(&addr
->s6_addr32
[2], w3
, w4
);
410 static inline bool ipv6_addr_equal(const struct in6_addr
*a1
,
411 const struct in6_addr
*a2
)
413 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
414 const unsigned long *ul1
= (const unsigned long *)a1
;
415 const unsigned long *ul2
= (const unsigned long *)a2
;
417 return ((ul1
[0] ^ ul2
[0]) | (ul1
[1] ^ ul2
[1])) == 0UL;
419 return ((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) |
420 (a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) |
421 (a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) |
422 (a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3])) == 0;
426 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
427 static inline bool __ipv6_prefix_equal64_half(const __be64
*a1
,
431 if (len
&& ((*a1
^ *a2
) & cpu_to_be64((~0UL) << (64 - len
))))
436 static inline bool ipv6_prefix_equal(const struct in6_addr
*addr1
,
437 const struct in6_addr
*addr2
,
438 unsigned int prefixlen
)
440 const __be64
*a1
= (const __be64
*)addr1
;
441 const __be64
*a2
= (const __be64
*)addr2
;
443 if (prefixlen
>= 64) {
446 return __ipv6_prefix_equal64_half(a1
+ 1, a2
+ 1, prefixlen
- 64);
448 return __ipv6_prefix_equal64_half(a1
, a2
, prefixlen
);
451 static inline bool ipv6_prefix_equal(const struct in6_addr
*addr1
,
452 const struct in6_addr
*addr2
,
453 unsigned int prefixlen
)
455 const __be32
*a1
= addr1
->s6_addr32
;
456 const __be32
*a2
= addr2
->s6_addr32
;
457 unsigned int pdw
, pbi
;
459 /* check complete u32 in prefix */
460 pdw
= prefixlen
>> 5;
461 if (pdw
&& memcmp(a1
, a2
, pdw
<< 2))
464 /* check incomplete u32 in prefix */
465 pbi
= prefixlen
& 0x1f;
466 if (pbi
&& ((a1
[pdw
] ^ a2
[pdw
]) & htonl((0xffffffff) << (32 - pbi
))))
473 struct inet_frag_queue
;
475 enum ip6_defrag_users
{
476 IP6_DEFRAG_LOCAL_DELIVER
,
477 IP6_DEFRAG_CONNTRACK_IN
,
478 __IP6_DEFRAG_CONNTRACK_IN
= IP6_DEFRAG_CONNTRACK_IN
+ USHRT_MAX
,
479 IP6_DEFRAG_CONNTRACK_OUT
,
480 __IP6_DEFRAG_CONNTRACK_OUT
= IP6_DEFRAG_CONNTRACK_OUT
+ USHRT_MAX
,
481 IP6_DEFRAG_CONNTRACK_BRIDGE_IN
,
482 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN
= IP6_DEFRAG_CONNTRACK_BRIDGE_IN
+ USHRT_MAX
,
485 struct ip6_create_arg
{
488 const struct in6_addr
*src
;
489 const struct in6_addr
*dst
;
493 void ip6_frag_init(struct inet_frag_queue
*q
, void *a
);
494 bool ip6_frag_match(struct inet_frag_queue
*q
, void *a
);
497 * Equivalent of ipv4 struct ip
500 struct inet_frag_queue q
;
502 __be32 id
; /* fragment id */
504 struct in6_addr saddr
;
505 struct in6_addr daddr
;
513 void ip6_expire_frag_queue(struct net
*net
, struct frag_queue
*fq
,
514 struct inet_frags
*frags
);
516 static inline bool ipv6_addr_any(const struct in6_addr
*a
)
518 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
519 const unsigned long *ul
= (const unsigned long *)a
;
521 return (ul
[0] | ul
[1]) == 0UL;
523 return (a
->s6_addr32
[0] | a
->s6_addr32
[1] |
524 a
->s6_addr32
[2] | a
->s6_addr32
[3]) == 0;
528 static inline u32
ipv6_addr_hash(const struct in6_addr
*a
)
530 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
531 const unsigned long *ul
= (const unsigned long *)a
;
532 unsigned long x
= ul
[0] ^ ul
[1];
534 return (u32
)(x
^ (x
>> 32));
536 return (__force u32
)(a
->s6_addr32
[0] ^ a
->s6_addr32
[1] ^
537 a
->s6_addr32
[2] ^ a
->s6_addr32
[3]);
541 /* more secured version of ipv6_addr_hash() */
542 static inline u32
__ipv6_addr_jhash(const struct in6_addr
*a
, const u32 initval
)
544 u32 v
= (__force u32
)a
->s6_addr32
[0] ^ (__force u32
)a
->s6_addr32
[1];
546 return jhash_3words(v
,
547 (__force u32
)a
->s6_addr32
[2],
548 (__force u32
)a
->s6_addr32
[3],
552 static inline u32
ipv6_addr_jhash(const struct in6_addr
*a
)
554 return __ipv6_addr_jhash(a
, ipv6_hash_secret
);
557 static inline bool ipv6_addr_loopback(const struct in6_addr
*a
)
559 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
560 const unsigned long *ul
= (const unsigned long *)a
;
562 return (ul
[0] | (ul
[1] ^ cpu_to_be64(1))) == 0UL;
564 return (a
->s6_addr32
[0] | a
->s6_addr32
[1] |
565 a
->s6_addr32
[2] | (a
->s6_addr32
[3] ^ htonl(1))) == 0;
569 static inline bool ipv6_addr_v4mapped(const struct in6_addr
*a
)
572 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
575 (a
->s6_addr32
[0] | a
->s6_addr32
[1]) |
577 (a
->s6_addr32
[2] ^ htonl(0x0000ffff))) == 0UL;
581 * Check for a RFC 4843 ORCHID address
582 * (Overlay Routable Cryptographic Hash Identifiers)
584 static inline bool ipv6_addr_orchid(const struct in6_addr
*a
)
586 return (a
->s6_addr32
[0] & htonl(0xfffffff0)) == htonl(0x20010010);
589 static inline void ipv6_addr_set_v4mapped(const __be32 addr
,
590 struct in6_addr
*v4mapped
)
592 ipv6_addr_set(v4mapped
,
599 * find the first different bit between two addresses
600 * length of address must be a multiple of 32bits
602 static inline int __ipv6_addr_diff32(const void *token1
, const void *token2
, int addrlen
)
604 const __be32
*a1
= token1
, *a2
= token2
;
609 for (i
= 0; i
< addrlen
; i
++) {
610 __be32 xb
= a1
[i
] ^ a2
[i
];
612 return i
* 32 + 31 - __fls(ntohl(xb
));
616 * we should *never* get to this point since that
617 * would mean the addrs are equal
619 * However, we do get to it 8) And exacly, when
620 * addresses are equal 8)
622 * ip route add 1111::/128 via ...
623 * ip route add 1111::/64 via ...
626 * Ideally, this function should stop comparison
627 * at prefix length. It does not, but it is still OK,
628 * if returned value is greater than prefix length.
634 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
635 static inline int __ipv6_addr_diff64(const void *token1
, const void *token2
, int addrlen
)
637 const __be64
*a1
= token1
, *a2
= token2
;
642 for (i
= 0; i
< addrlen
; i
++) {
643 __be64 xb
= a1
[i
] ^ a2
[i
];
645 return i
* 64 + 63 - __fls(be64_to_cpu(xb
));
652 static inline int __ipv6_addr_diff(const void *token1
, const void *token2
, int addrlen
)
654 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
655 if (__builtin_constant_p(addrlen
) && !(addrlen
& 7))
656 return __ipv6_addr_diff64(token1
, token2
, addrlen
);
658 return __ipv6_addr_diff32(token1
, token2
, addrlen
);
661 static inline int ipv6_addr_diff(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
663 return __ipv6_addr_diff(a1
, a2
, sizeof(struct in6_addr
));
667 * Header manipulation
669 static inline void ip6_flow_hdr(struct ipv6hdr
*hdr
, unsigned int tclass
,
672 *(__be32
*)hdr
= htonl(0x60000000 | (tclass
<< 20)) | flowlabel
;
675 static inline __be32
ip6_flowinfo(const struct ipv6hdr
*hdr
)
677 return *(__be32
*)hdr
& IPV6_FLOWINFO_MASK
;
681 * Prototypes exported by ipv6
685 * rcv function (called from netdevice level)
688 extern int ipv6_rcv(struct sk_buff
*skb
,
689 struct net_device
*dev
,
690 struct packet_type
*pt
,
691 struct net_device
*orig_dev
);
693 extern int ip6_rcv_finish(struct sk_buff
*skb
);
696 * upper-layer output functions
698 extern int ip6_xmit(struct sock
*sk
,
701 struct ipv6_txoptions
*opt
,
704 extern int ip6_find_1stfragopt(struct sk_buff
*skb
, u8
**nexthdr
);
706 extern int ip6_append_data(struct sock
*sk
,
707 int getfrag(void *from
, char *to
, int offset
, int len
, int odd
, struct sk_buff
*skb
),
713 struct ipv6_txoptions
*opt
,
719 extern int ip6_push_pending_frames(struct sock
*sk
);
721 extern void ip6_flush_pending_frames(struct sock
*sk
);
723 extern int ip6_dst_lookup(struct sock
*sk
,
724 struct dst_entry
**dst
,
726 extern struct dst_entry
* ip6_dst_lookup_flow(struct sock
*sk
,
728 const struct in6_addr
*final_dst
,
730 extern struct dst_entry
* ip6_sk_dst_lookup_flow(struct sock
*sk
,
732 const struct in6_addr
*final_dst
,
734 extern struct dst_entry
* ip6_blackhole_route(struct net
*net
,
735 struct dst_entry
*orig_dst
);
738 * skb processing functions
741 extern int ip6_output(struct sk_buff
*skb
);
742 extern int ip6_forward(struct sk_buff
*skb
);
743 extern int ip6_input(struct sk_buff
*skb
);
744 extern int ip6_mc_input(struct sk_buff
*skb
);
746 extern int __ip6_local_out(struct sk_buff
*skb
);
747 extern int ip6_local_out(struct sk_buff
*skb
);
750 * Extension header (options) processing
753 extern void ipv6_push_nfrag_opts(struct sk_buff
*skb
,
754 struct ipv6_txoptions
*opt
,
756 struct in6_addr
**daddr_p
);
757 extern void ipv6_push_frag_opts(struct sk_buff
*skb
,
758 struct ipv6_txoptions
*opt
,
761 extern int ipv6_skip_exthdr(const struct sk_buff
*, int start
,
762 u8
*nexthdrp
, __be16
*frag_offp
);
764 extern bool ipv6_ext_hdr(u8 nexthdr
);
767 IP6_FH_F_FRAG
= (1 << 0),
768 IP6_FH_F_AUTH
= (1 << 1),
769 IP6_FH_F_SKIP_RH
= (1 << 2),
772 /* find specified header and get offset to it */
773 extern int ipv6_find_hdr(const struct sk_buff
*skb
, unsigned int *offset
,
774 int target
, unsigned short *fragoff
, int *fragflg
);
776 extern int ipv6_find_tlv(struct sk_buff
*skb
, int offset
, int type
);
778 extern struct in6_addr
*fl6_update_dst(struct flowi6
*fl6
,
779 const struct ipv6_txoptions
*opt
,
780 struct in6_addr
*orig
);
783 * socket options (ipv6_sockglue.c)
786 extern int ipv6_setsockopt(struct sock
*sk
, int level
,
789 unsigned int optlen
);
790 extern int ipv6_getsockopt(struct sock
*sk
, int level
,
794 extern int compat_ipv6_setsockopt(struct sock
*sk
,
798 unsigned int optlen
);
799 extern int compat_ipv6_getsockopt(struct sock
*sk
,
805 extern int ip6_datagram_connect(struct sock
*sk
,
806 struct sockaddr
*addr
, int addr_len
);
808 extern int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
,
810 extern int ipv6_recv_rxpmtu(struct sock
*sk
, struct msghdr
*msg
, int len
,
812 extern void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
, __be16 port
,
813 u32 info
, u8
*payload
);
814 extern void ipv6_local_error(struct sock
*sk
, int err
, struct flowi6
*fl6
, u32 info
);
815 extern void ipv6_local_rxpmtu(struct sock
*sk
, struct flowi6
*fl6
, u32 mtu
);
817 extern int inet6_release(struct socket
*sock
);
818 extern int inet6_bind(struct socket
*sock
, struct sockaddr
*uaddr
,
820 extern int inet6_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
821 int *uaddr_len
, int peer
);
822 extern int inet6_ioctl(struct socket
*sock
, unsigned int cmd
,
825 extern int inet6_hash_connect(struct inet_timewait_death_row
*death_row
,
831 extern const struct proto_ops inet6_stream_ops
;
832 extern const struct proto_ops inet6_dgram_ops
;
834 struct group_source_req
;
837 extern int ip6_mc_source(int add
, int omode
, struct sock
*sk
,
838 struct group_source_req
*pgsr
);
839 extern int ip6_mc_msfilter(struct sock
*sk
, struct group_filter
*gsf
);
840 extern int ip6_mc_msfget(struct sock
*sk
, struct group_filter
*gsf
,
841 struct group_filter __user
*optval
,
843 extern unsigned int inet6_hash_frag(__be32 id
, const struct in6_addr
*saddr
,
844 const struct in6_addr
*daddr
, u32 rnd
);
846 #ifdef CONFIG_PROC_FS
847 extern int ac6_proc_init(struct net
*net
);
848 extern void ac6_proc_exit(struct net
*net
);
849 extern int raw6_proc_init(void);
850 extern void raw6_proc_exit(void);
851 extern int tcp6_proc_init(struct net
*net
);
852 extern void tcp6_proc_exit(struct net
*net
);
853 extern int udp6_proc_init(struct net
*net
);
854 extern void udp6_proc_exit(struct net
*net
);
855 extern int udplite6_proc_init(void);
856 extern void udplite6_proc_exit(void);
857 extern int ipv6_misc_proc_init(void);
858 extern void ipv6_misc_proc_exit(void);
859 extern int snmp6_register_dev(struct inet6_dev
*idev
);
860 extern int snmp6_unregister_dev(struct inet6_dev
*idev
);
863 static inline int ac6_proc_init(struct net
*net
) { return 0; }
864 static inline void ac6_proc_exit(struct net
*net
) { }
865 static inline int snmp6_register_dev(struct inet6_dev
*idev
) { return 0; }
866 static inline int snmp6_unregister_dev(struct inet6_dev
*idev
) { return 0; }
870 extern ctl_table ipv6_route_table_template
[];
871 extern ctl_table ipv6_icmp_table_template
[];
873 extern struct ctl_table
*ipv6_icmp_sysctl_init(struct net
*net
);
874 extern struct ctl_table
*ipv6_route_sysctl_init(struct net
*net
);
875 extern int ipv6_sysctl_register(void);
876 extern void ipv6_sysctl_unregister(void);
879 #endif /* _NET_IPV6_H */