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_SCTP 132 /* SCTP message. */
45 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
47 #define NEXTHDR_MAX 255
51 #define IPV6_DEFAULT_HOPLIMIT 64
52 #define IPV6_DEFAULT_MCASTHOPS 1
57 * type - unicast | multicast
58 * scope - local | site | global
65 #define IPV6_ADDR_ANY 0x0000U
67 #define IPV6_ADDR_UNICAST 0x0001U
68 #define IPV6_ADDR_MULTICAST 0x0002U
70 #define IPV6_ADDR_LOOPBACK 0x0010U
71 #define IPV6_ADDR_LINKLOCAL 0x0020U
72 #define IPV6_ADDR_SITELOCAL 0x0040U
74 #define IPV6_ADDR_COMPATv4 0x0080U
76 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
78 #define IPV6_ADDR_MAPPED 0x1000U
83 #define IPV6_ADDR_MC_SCOPE(a) \
84 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
85 #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
95 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
96 ((a)->s6_addr[1] & 0x10)
97 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
98 ((a)->s6_addr[1] & 0x20)
99 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
100 ((a)->s6_addr[1] & 0x40)
103 * fragmentation header
110 __be32 identification
;
113 #define IP6_MF 0x0001
114 #define IP6_OFFSET 0xFFF8
116 #define IP6_REPLY_MARK(net, mark) \
117 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
119 #include <net/sock.h>
122 extern int sysctl_mld_max_msf
;
124 #define _DEVINC(net, statname, modifier, idev, field) \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
129 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
132 /* per device counters are atomic_long_t */
133 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \
135 struct inet6_dev *_idev = (idev); \
136 if (likely(_idev != NULL)) \
137 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
138 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
141 /* per device and per net counters are atomic_long_t */
142 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
144 struct inet6_dev *_idev = (idev); \
145 if (likely(_idev != NULL)) \
146 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
147 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
150 #define _DEVADD(net, statname, modifier, idev, field, val) \
152 struct inet6_dev *_idev = (idev); \
153 if (likely(_idev != NULL)) \
154 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
155 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
158 #define _DEVUPD(net, statname, modifier, idev, field, val) \
160 struct inet6_dev *_idev = (idev); \
161 if (likely(_idev != NULL)) \
162 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
163 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
168 #define IP6_INC_STATS(net, idev,field) \
169 _DEVINC(net, ipv6, 64, idev, field)
170 #define IP6_INC_STATS_BH(net, idev,field) \
171 _DEVINC(net, ipv6, 64_BH, idev, field)
172 #define IP6_ADD_STATS(net, idev,field,val) \
173 _DEVADD(net, ipv6, 64, idev, field, val)
174 #define IP6_ADD_STATS_BH(net, idev,field,val) \
175 _DEVADD(net, ipv6, 64_BH, idev, field, val)
176 #define IP6_UPD_PO_STATS(net, idev,field,val) \
177 _DEVUPD(net, ipv6, 64, idev, field, val)
178 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
179 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
180 #define ICMP6_INC_STATS(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, , idev, field)
182 #define ICMP6_INC_STATS_BH(net, idev, field) \
183 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
185 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
189 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
190 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
192 struct ip6_ra_chain
{
193 struct ip6_ra_chain
*next
;
196 void (*destructor
)(struct sock
*);
199 extern struct ip6_ra_chain
*ip6_ra_chain
;
200 extern rwlock_t ip6_ra_lock
;
203 This structure is prepared by protocol, when parsing
204 ancillary data and passed to IPv6.
207 struct ipv6_txoptions
{
208 /* Length of this structure */
211 /* length of extension headers */
213 __u16 opt_flen
; /* after fragment hdr */
214 __u16 opt_nflen
; /* before fragment hdr */
216 struct ipv6_opt_hdr
*hopopt
;
217 struct ipv6_opt_hdr
*dst0opt
;
218 struct ipv6_rt_hdr
*srcrt
; /* Routing Header */
219 struct ipv6_opt_hdr
*dst1opt
;
221 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
224 struct ip6_flowlabel
{
225 struct ip6_flowlabel __rcu
*next
;
229 struct ipv6_txoptions
*opt
;
230 unsigned long linger
;
237 unsigned long lastuse
;
238 unsigned long expires
;
242 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
243 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
244 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
245 #define IPV6_TCLASS_SHIFT 20
247 struct ipv6_fl_socklist
{
248 struct ipv6_fl_socklist __rcu
*next
;
249 struct ip6_flowlabel
*fl
;
253 struct ip6_flowlabel
*fl6_sock_lookup(struct sock
*sk
, __be32 label
);
254 struct ipv6_txoptions
*fl6_merge_options(struct ipv6_txoptions
*opt_space
,
255 struct ip6_flowlabel
*fl
,
256 struct ipv6_txoptions
*fopt
);
257 void fl6_free_socklist(struct sock
*sk
);
258 int ipv6_flowlabel_opt(struct sock
*sk
, char __user
*optval
, int optlen
);
259 int ipv6_flowlabel_opt_get(struct sock
*sk
, struct in6_flowlabel_req
*freq
,
261 int ip6_flowlabel_init(void);
262 void ip6_flowlabel_cleanup(void);
264 static inline void fl6_sock_release(struct ip6_flowlabel
*fl
)
267 atomic_dec(&fl
->users
);
270 void icmpv6_notify(struct sk_buff
*skb
, u8 type
, u8 code
, __be32 info
);
272 int icmpv6_push_pending_frames(struct sock
*sk
, struct flowi6
*fl6
,
273 struct icmp6hdr
*thdr
, int len
);
275 int ip6_ra_control(struct sock
*sk
, int sel
);
277 int ipv6_parse_hopopts(struct sk_buff
*skb
);
279 struct ipv6_txoptions
*ipv6_dup_options(struct sock
*sk
,
280 struct ipv6_txoptions
*opt
);
281 struct ipv6_txoptions
*ipv6_renew_options(struct sock
*sk
,
282 struct ipv6_txoptions
*opt
,
284 struct ipv6_opt_hdr __user
*newopt
,
286 struct ipv6_txoptions
*ipv6_fixup_options(struct ipv6_txoptions
*opt_space
,
287 struct ipv6_txoptions
*opt
);
289 bool ipv6_opt_accepted(const struct sock
*sk
, const struct sk_buff
*skb
);
291 static inline bool ipv6_accept_ra(struct inet6_dev
*idev
)
293 /* If forwarding is enabled, RA are not accepted unless the special
294 * hybrid mode (accept_ra=2) is enabled.
296 return idev
->cnf
.forwarding
? idev
->cnf
.accept_ra
== 2 :
300 #if IS_ENABLED(CONFIG_IPV6)
301 static inline int ip6_frag_nqueues(struct net
*net
)
303 return net
->ipv6
.frags
.nqueues
;
306 static inline int ip6_frag_mem(struct net
*net
)
308 return sum_frag_mem_limit(&net
->ipv6
.frags
);
312 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
313 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
314 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
316 int __ipv6_addr_type(const struct in6_addr
*addr
);
317 static inline int ipv6_addr_type(const struct in6_addr
*addr
)
319 return __ipv6_addr_type(addr
) & 0xffff;
322 static inline int ipv6_addr_scope(const struct in6_addr
*addr
)
324 return __ipv6_addr_type(addr
) & IPV6_ADDR_SCOPE_MASK
;
327 static inline int __ipv6_addr_src_scope(int type
)
329 return (type
== IPV6_ADDR_ANY
) ? __IPV6_ADDR_SCOPE_INVALID
: (type
>> 16);
332 static inline int ipv6_addr_src_scope(const struct in6_addr
*addr
)
334 return __ipv6_addr_src_scope(__ipv6_addr_type(addr
));
337 static inline bool __ipv6_addr_needs_scope_id(int type
)
339 return type
& IPV6_ADDR_LINKLOCAL
||
340 (type
& IPV6_ADDR_MULTICAST
&&
341 (type
& (IPV6_ADDR_LOOPBACK
|IPV6_ADDR_LINKLOCAL
)));
344 static inline __u32
ipv6_iface_scope_id(const struct in6_addr
*addr
, int iface
)
346 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr
)) ? iface
: 0;
349 static inline int ipv6_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
351 return memcmp(a1
, a2
, sizeof(struct in6_addr
));
355 ipv6_masked_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*m
,
356 const struct in6_addr
*a2
)
358 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
359 const unsigned long *ul1
= (const unsigned long *)a1
;
360 const unsigned long *ulm
= (const unsigned long *)m
;
361 const unsigned long *ul2
= (const unsigned long *)a2
;
363 return !!(((ul1
[0] ^ ul2
[0]) & ulm
[0]) |
364 ((ul1
[1] ^ ul2
[1]) & ulm
[1]));
366 return !!(((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) & m
->s6_addr32
[0]) |
367 ((a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) & m
->s6_addr32
[1]) |
368 ((a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) & m
->s6_addr32
[2]) |
369 ((a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3]) & m
->s6_addr32
[3]));
373 static inline void ipv6_addr_prefix(struct in6_addr
*pfx
,
374 const struct in6_addr
*addr
,
377 /* caller must guarantee 0 <= plen <= 128 */
381 memset(pfx
->s6_addr
, 0, sizeof(pfx
->s6_addr
));
382 memcpy(pfx
->s6_addr
, addr
, o
);
384 pfx
->s6_addr
[o
] = addr
->s6_addr
[o
] & (0xff00 >> b
);
387 static inline void __ipv6_addr_set_half(__be32
*addr
,
388 __be32 wh
, __be32 wl
)
390 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
391 #if defined(__BIG_ENDIAN)
392 if (__builtin_constant_p(wh
) && __builtin_constant_p(wl
)) {
393 *(__force u64
*)addr
= ((__force u64
)(wh
) << 32 | (__force u64
)(wl
));
396 #elif defined(__LITTLE_ENDIAN)
397 if (__builtin_constant_p(wl
) && __builtin_constant_p(wh
)) {
398 *(__force u64
*)addr
= ((__force u64
)(wl
) << 32 | (__force u64
)(wh
));
407 static inline void ipv6_addr_set(struct in6_addr
*addr
,
408 __be32 w1
, __be32 w2
,
409 __be32 w3
, __be32 w4
)
411 __ipv6_addr_set_half(&addr
->s6_addr32
[0], w1
, w2
);
412 __ipv6_addr_set_half(&addr
->s6_addr32
[2], w3
, w4
);
415 static inline bool ipv6_addr_equal(const struct in6_addr
*a1
,
416 const struct in6_addr
*a2
)
418 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
419 const unsigned long *ul1
= (const unsigned long *)a1
;
420 const unsigned long *ul2
= (const unsigned long *)a2
;
422 return ((ul1
[0] ^ ul2
[0]) | (ul1
[1] ^ ul2
[1])) == 0UL;
424 return ((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) |
425 (a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) |
426 (a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) |
427 (a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3])) == 0;
431 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
432 static inline bool __ipv6_prefix_equal64_half(const __be64
*a1
,
436 if (len
&& ((*a1
^ *a2
) & cpu_to_be64((~0UL) << (64 - len
))))
441 static inline bool ipv6_prefix_equal(const struct in6_addr
*addr1
,
442 const struct in6_addr
*addr2
,
443 unsigned int prefixlen
)
445 const __be64
*a1
= (const __be64
*)addr1
;
446 const __be64
*a2
= (const __be64
*)addr2
;
448 if (prefixlen
>= 64) {
451 return __ipv6_prefix_equal64_half(a1
+ 1, a2
+ 1, prefixlen
- 64);
453 return __ipv6_prefix_equal64_half(a1
, a2
, prefixlen
);
456 static inline bool ipv6_prefix_equal(const struct in6_addr
*addr1
,
457 const struct in6_addr
*addr2
,
458 unsigned int prefixlen
)
460 const __be32
*a1
= addr1
->s6_addr32
;
461 const __be32
*a2
= addr2
->s6_addr32
;
462 unsigned int pdw
, pbi
;
464 /* check complete u32 in prefix */
465 pdw
= prefixlen
>> 5;
466 if (pdw
&& memcmp(a1
, a2
, pdw
<< 2))
469 /* check incomplete u32 in prefix */
470 pbi
= prefixlen
& 0x1f;
471 if (pbi
&& ((a1
[pdw
] ^ a2
[pdw
]) & htonl((0xffffffff) << (32 - pbi
))))
478 struct inet_frag_queue
;
480 enum ip6_defrag_users
{
481 IP6_DEFRAG_LOCAL_DELIVER
,
482 IP6_DEFRAG_CONNTRACK_IN
,
483 __IP6_DEFRAG_CONNTRACK_IN
= IP6_DEFRAG_CONNTRACK_IN
+ USHRT_MAX
,
484 IP6_DEFRAG_CONNTRACK_OUT
,
485 __IP6_DEFRAG_CONNTRACK_OUT
= IP6_DEFRAG_CONNTRACK_OUT
+ USHRT_MAX
,
486 IP6_DEFRAG_CONNTRACK_BRIDGE_IN
,
487 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN
= IP6_DEFRAG_CONNTRACK_BRIDGE_IN
+ USHRT_MAX
,
490 struct ip6_create_arg
{
493 const struct in6_addr
*src
;
494 const struct in6_addr
*dst
;
498 void ip6_frag_init(struct inet_frag_queue
*q
, void *a
);
499 bool ip6_frag_match(struct inet_frag_queue
*q
, void *a
);
502 * Equivalent of ipv4 struct ip
505 struct inet_frag_queue q
;
507 __be32 id
; /* fragment id */
509 struct in6_addr saddr
;
510 struct in6_addr daddr
;
518 void ip6_expire_frag_queue(struct net
*net
, struct frag_queue
*fq
,
519 struct inet_frags
*frags
);
521 static inline bool ipv6_addr_any(const struct in6_addr
*a
)
523 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
524 const unsigned long *ul
= (const unsigned long *)a
;
526 return (ul
[0] | ul
[1]) == 0UL;
528 return (a
->s6_addr32
[0] | a
->s6_addr32
[1] |
529 a
->s6_addr32
[2] | a
->s6_addr32
[3]) == 0;
533 static inline u32
ipv6_addr_hash(const struct in6_addr
*a
)
535 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
536 const unsigned long *ul
= (const unsigned long *)a
;
537 unsigned long x
= ul
[0] ^ ul
[1];
539 return (u32
)(x
^ (x
>> 32));
541 return (__force u32
)(a
->s6_addr32
[0] ^ a
->s6_addr32
[1] ^
542 a
->s6_addr32
[2] ^ a
->s6_addr32
[3]);
546 /* more secured version of ipv6_addr_hash() */
547 static inline u32
__ipv6_addr_jhash(const struct in6_addr
*a
, const u32 initval
)
549 u32 v
= (__force u32
)a
->s6_addr32
[0] ^ (__force u32
)a
->s6_addr32
[1];
551 return jhash_3words(v
,
552 (__force u32
)a
->s6_addr32
[2],
553 (__force u32
)a
->s6_addr32
[3],
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 bool ipv6_addr_is_multicast(const struct in6_addr
*addr
)
591 return (addr
->s6_addr32
[0] & htonl(0xFF000000)) == htonl(0xFF000000);
594 static inline void ipv6_addr_set_v4mapped(const __be32 addr
,
595 struct in6_addr
*v4mapped
)
597 ipv6_addr_set(v4mapped
,
604 * find the first different bit between two addresses
605 * length of address must be a multiple of 32bits
607 static inline int __ipv6_addr_diff32(const void *token1
, const void *token2
, int addrlen
)
609 const __be32
*a1
= token1
, *a2
= token2
;
614 for (i
= 0; i
< addrlen
; i
++) {
615 __be32 xb
= a1
[i
] ^ a2
[i
];
617 return i
* 32 + 31 - __fls(ntohl(xb
));
621 * we should *never* get to this point since that
622 * would mean the addrs are equal
624 * However, we do get to it 8) And exacly, when
625 * addresses are equal 8)
627 * ip route add 1111::/128 via ...
628 * ip route add 1111::/64 via ...
631 * Ideally, this function should stop comparison
632 * at prefix length. It does not, but it is still OK,
633 * if returned value is greater than prefix length.
639 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
640 static inline int __ipv6_addr_diff64(const void *token1
, const void *token2
, int addrlen
)
642 const __be64
*a1
= token1
, *a2
= token2
;
647 for (i
= 0; i
< addrlen
; i
++) {
648 __be64 xb
= a1
[i
] ^ a2
[i
];
650 return i
* 64 + 63 - __fls(be64_to_cpu(xb
));
657 static inline int __ipv6_addr_diff(const void *token1
, const void *token2
, int addrlen
)
659 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
660 if (__builtin_constant_p(addrlen
) && !(addrlen
& 7))
661 return __ipv6_addr_diff64(token1
, token2
, addrlen
);
663 return __ipv6_addr_diff32(token1
, token2
, addrlen
);
666 static inline int ipv6_addr_diff(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
668 return __ipv6_addr_diff(a1
, a2
, sizeof(struct in6_addr
));
671 int ip6_dst_hoplimit(struct dst_entry
*dst
);
673 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo
*np
, struct flowi6
*fl6
,
674 struct dst_entry
*dst
)
678 if (ipv6_addr_is_multicast(&fl6
->daddr
))
679 hlimit
= np
->mcast_hops
;
681 hlimit
= np
->hop_limit
;
683 hlimit
= ip6_dst_hoplimit(dst
);
688 * Header manipulation
690 static inline void ip6_flow_hdr(struct ipv6hdr
*hdr
, unsigned int tclass
,
693 *(__be32
*)hdr
= htonl(0x60000000 | (tclass
<< 20)) | flowlabel
;
696 static inline __be32
ip6_flowinfo(const struct ipv6hdr
*hdr
)
698 return *(__be32
*)hdr
& IPV6_FLOWINFO_MASK
;
701 static inline __be32
ip6_flowlabel(const struct ipv6hdr
*hdr
)
703 return *(__be32
*)hdr
& IPV6_FLOWLABEL_MASK
;
706 static inline u8
ip6_tclass(__be32 flowinfo
)
708 return ntohl(flowinfo
& IPV6_TCLASS_MASK
) >> IPV6_TCLASS_SHIFT
;
711 * Prototypes exported by ipv6
715 * rcv function (called from netdevice level)
718 int ipv6_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
719 struct packet_type
*pt
, struct net_device
*orig_dev
);
721 int ip6_rcv_finish(struct sk_buff
*skb
);
724 * upper-layer output functions
726 int ip6_xmit(struct sock
*sk
, struct sk_buff
*skb
, struct flowi6
*fl6
,
727 struct ipv6_txoptions
*opt
, int tclass
);
729 int ip6_find_1stfragopt(struct sk_buff
*skb
, u8
**nexthdr
);
731 int ip6_append_data(struct sock
*sk
,
732 int getfrag(void *from
, char *to
, int offset
, int len
,
733 int odd
, struct sk_buff
*skb
),
734 void *from
, int length
, int transhdrlen
, int hlimit
,
735 int tclass
, struct ipv6_txoptions
*opt
, struct flowi6
*fl6
,
736 struct rt6_info
*rt
, unsigned int flags
, int dontfrag
);
738 int ip6_push_pending_frames(struct sock
*sk
);
740 void ip6_flush_pending_frames(struct sock
*sk
);
742 int ip6_dst_lookup(struct sock
*sk
, struct dst_entry
**dst
, struct flowi6
*fl6
);
743 struct dst_entry
*ip6_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
744 const struct in6_addr
*final_dst
);
745 struct dst_entry
*ip6_sk_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
746 const struct in6_addr
*final_dst
);
747 struct dst_entry
*ip6_blackhole_route(struct net
*net
,
748 struct dst_entry
*orig_dst
);
751 * skb processing functions
754 int ip6_output(struct sock
*sk
, struct sk_buff
*skb
);
755 int ip6_forward(struct sk_buff
*skb
);
756 int ip6_input(struct sk_buff
*skb
);
757 int ip6_mc_input(struct sk_buff
*skb
);
759 int __ip6_local_out(struct sk_buff
*skb
);
760 int ip6_local_out(struct sk_buff
*skb
);
763 * Extension header (options) processing
766 void ipv6_push_nfrag_opts(struct sk_buff
*skb
, struct ipv6_txoptions
*opt
,
767 u8
*proto
, struct in6_addr
**daddr_p
);
768 void ipv6_push_frag_opts(struct sk_buff
*skb
, struct ipv6_txoptions
*opt
,
771 int ipv6_skip_exthdr(const struct sk_buff
*, int start
, u8
*nexthdrp
,
774 bool ipv6_ext_hdr(u8 nexthdr
);
777 IP6_FH_F_FRAG
= (1 << 0),
778 IP6_FH_F_AUTH
= (1 << 1),
779 IP6_FH_F_SKIP_RH
= (1 << 2),
782 /* find specified header and get offset to it */
783 int ipv6_find_hdr(const struct sk_buff
*skb
, unsigned int *offset
, int target
,
784 unsigned short *fragoff
, int *fragflg
);
786 int ipv6_find_tlv(struct sk_buff
*skb
, int offset
, int type
);
788 struct in6_addr
*fl6_update_dst(struct flowi6
*fl6
,
789 const struct ipv6_txoptions
*opt
,
790 struct in6_addr
*orig
);
793 * socket options (ipv6_sockglue.c)
796 int ipv6_setsockopt(struct sock
*sk
, int level
, int optname
,
797 char __user
*optval
, unsigned int optlen
);
798 int ipv6_getsockopt(struct sock
*sk
, int level
, int optname
,
799 char __user
*optval
, int __user
*optlen
);
800 int compat_ipv6_setsockopt(struct sock
*sk
, int level
, int optname
,
801 char __user
*optval
, unsigned int optlen
);
802 int compat_ipv6_getsockopt(struct sock
*sk
, int level
, int optname
,
803 char __user
*optval
, int __user
*optlen
);
805 int ip6_datagram_connect(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
);
806 int ip6_datagram_connect_v6_only(struct sock
*sk
, struct sockaddr
*addr
,
809 int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
,
811 int ipv6_recv_rxpmtu(struct sock
*sk
, struct msghdr
*msg
, int len
,
813 void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
, __be16 port
,
814 u32 info
, u8
*payload
);
815 void ipv6_local_error(struct sock
*sk
, int err
, struct flowi6
*fl6
, u32 info
);
816 void ipv6_local_rxpmtu(struct sock
*sk
, struct flowi6
*fl6
, u32 mtu
);
818 int inet6_release(struct socket
*sock
);
819 int inet6_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
);
820 int inet6_getname(struct socket
*sock
, struct sockaddr
*uaddr
, int *uaddr_len
,
822 int inet6_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
);
824 int inet6_hash_connect(struct inet_timewait_death_row
*death_row
,
830 extern const struct proto_ops inet6_stream_ops
;
831 extern const struct proto_ops inet6_dgram_ops
;
833 struct group_source_req
;
836 int ip6_mc_source(int add
, int omode
, struct sock
*sk
,
837 struct group_source_req
*pgsr
);
838 int ip6_mc_msfilter(struct sock
*sk
, struct group_filter
*gsf
);
839 int ip6_mc_msfget(struct sock
*sk
, struct group_filter
*gsf
,
840 struct group_filter __user
*optval
, int __user
*optlen
);
842 #ifdef CONFIG_PROC_FS
843 int ac6_proc_init(struct net
*net
);
844 void ac6_proc_exit(struct net
*net
);
845 int raw6_proc_init(void);
846 void raw6_proc_exit(void);
847 int tcp6_proc_init(struct net
*net
);
848 void tcp6_proc_exit(struct net
*net
);
849 int udp6_proc_init(struct net
*net
);
850 void udp6_proc_exit(struct net
*net
);
851 int udplite6_proc_init(void);
852 void udplite6_proc_exit(void);
853 int ipv6_misc_proc_init(void);
854 void ipv6_misc_proc_exit(void);
855 int snmp6_register_dev(struct inet6_dev
*idev
);
856 int snmp6_unregister_dev(struct inet6_dev
*idev
);
859 static inline int ac6_proc_init(struct net
*net
) { return 0; }
860 static inline void ac6_proc_exit(struct net
*net
) { }
861 static inline int snmp6_register_dev(struct inet6_dev
*idev
) { return 0; }
862 static inline int snmp6_unregister_dev(struct inet6_dev
*idev
) { return 0; }
866 extern struct ctl_table ipv6_route_table_template
[];
868 struct ctl_table
*ipv6_icmp_sysctl_init(struct net
*net
);
869 struct ctl_table
*ipv6_route_sysctl_init(struct net
*net
);
870 int ipv6_sysctl_register(void);
871 void ipv6_sysctl_unregister(void);
874 #endif /* _NET_IPV6_H */