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 <linux/refcount.h>
20 #include <net/if_inet6.h>
21 #include <net/ndisc.h>
23 #include <net/flow_dissector.h>
26 #define SIN6_LEN_RFC2133 24
28 #define IPV6_MAXPLEN 65535
31 * NextHeader field of IPv6 header
34 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
35 #define NEXTHDR_TCP 6 /* TCP segment. */
36 #define NEXTHDR_UDP 17 /* UDP message. */
37 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
38 #define NEXTHDR_ROUTING 43 /* Routing header. */
39 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
40 #define NEXTHDR_GRE 47 /* GRE header. */
41 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
42 #define NEXTHDR_AUTH 51 /* Authentication header. */
43 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
44 #define NEXTHDR_NONE 59 /* No next header */
45 #define NEXTHDR_DEST 60 /* Destination options header. */
46 #define NEXTHDR_SCTP 132 /* SCTP message. */
47 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
49 #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
;
123 extern int sysctl_mld_qrv
;
125 #define _DEVINC(net, statname, mod, idev, field) \
127 struct inet6_dev *_idev = (idev); \
128 if (likely(_idev != NULL)) \
129 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
130 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
133 /* per device counters are atomic_long_t */
134 #define _DEVINCATOMIC(net, statname, mod, idev, field) \
136 struct inet6_dev *_idev = (idev); \
137 if (likely(_idev != NULL)) \
138 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
139 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
142 /* per device and per net counters are atomic_long_t */
143 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
145 struct inet6_dev *_idev = (idev); \
146 if (likely(_idev != NULL)) \
147 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
148 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
151 #define _DEVADD(net, statname, mod, idev, field, val) \
153 struct inet6_dev *_idev = (idev); \
154 if (likely(_idev != NULL)) \
155 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
156 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
159 #define _DEVUPD(net, statname, mod, idev, field, val) \
161 struct inet6_dev *_idev = (idev); \
162 if (likely(_idev != NULL)) \
163 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
164 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
169 #define IP6_INC_STATS(net, idev,field) \
170 _DEVINC(net, ipv6, , idev, field)
171 #define __IP6_INC_STATS(net, idev,field) \
172 _DEVINC(net, ipv6, __, idev, field)
173 #define IP6_ADD_STATS(net, idev,field,val) \
174 _DEVADD(net, ipv6, , idev, field, val)
175 #define __IP6_ADD_STATS(net, idev,field,val) \
176 _DEVADD(net, ipv6, __, idev, field, val)
177 #define IP6_UPD_PO_STATS(net, idev,field,val) \
178 _DEVUPD(net, ipv6, , idev, field, val)
179 #define __IP6_UPD_PO_STATS(net, idev,field,val) \
180 _DEVUPD(net, ipv6, __, idev, field, val)
181 #define ICMP6_INC_STATS(net, idev, field) \
182 _DEVINCATOMIC(net, icmpv6, , idev, field)
183 #define __ICMP6_INC_STATS(net, idev, field) \
184 _DEVINCATOMIC(net, icmpv6, __, idev, field)
186 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
187 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
188 #define ICMP6MSGIN_INC_STATS(net, idev, field) \
189 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
191 struct ip6_ra_chain
{
192 struct ip6_ra_chain
*next
;
195 void (*destructor
)(struct sock
*);
198 extern struct ip6_ra_chain
*ip6_ra_chain
;
199 extern rwlock_t ip6_ra_lock
;
202 This structure is prepared by protocol, when parsing
203 ancillary data and passed to IPv6.
206 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_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
246 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
247 #define IPV6_TCLASS_SHIFT 20
249 struct ipv6_fl_socklist
{
250 struct ipv6_fl_socklist __rcu
*next
;
251 struct ip6_flowlabel
*fl
;
255 struct ipcm6_cookie
{
259 struct ipv6_txoptions
*opt
;
262 static inline struct ipv6_txoptions
*txopt_get(const struct ipv6_pinfo
*np
)
264 struct ipv6_txoptions
*opt
;
267 opt
= rcu_dereference(np
->opt
);
269 if (!refcount_inc_not_zero(&opt
->refcnt
))
272 opt
= rcu_pointer_handoff(opt
);
278 static inline void txopt_put(struct ipv6_txoptions
*opt
)
280 if (opt
&& refcount_dec_and_test(&opt
->refcnt
))
284 struct ip6_flowlabel
*fl6_sock_lookup(struct sock
*sk
, __be32 label
);
285 struct ipv6_txoptions
*fl6_merge_options(struct ipv6_txoptions
*opt_space
,
286 struct ip6_flowlabel
*fl
,
287 struct ipv6_txoptions
*fopt
);
288 void fl6_free_socklist(struct sock
*sk
);
289 int ipv6_flowlabel_opt(struct sock
*sk
, char __user
*optval
, int optlen
);
290 int ipv6_flowlabel_opt_get(struct sock
*sk
, struct in6_flowlabel_req
*freq
,
292 int ip6_flowlabel_init(void);
293 void ip6_flowlabel_cleanup(void);
294 bool ip6_autoflowlabel(struct net
*net
, const struct ipv6_pinfo
*np
);
296 static inline void fl6_sock_release(struct ip6_flowlabel
*fl
)
299 atomic_dec(&fl
->users
);
302 void icmpv6_notify(struct sk_buff
*skb
, u8 type
, u8 code
, __be32 info
);
304 int icmpv6_push_pending_frames(struct sock
*sk
, struct flowi6
*fl6
,
305 struct icmp6hdr
*thdr
, int len
);
307 int ip6_ra_control(struct sock
*sk
, int sel
);
309 int ipv6_parse_hopopts(struct sk_buff
*skb
);
311 struct ipv6_txoptions
*ipv6_dup_options(struct sock
*sk
,
312 struct ipv6_txoptions
*opt
);
313 struct ipv6_txoptions
*ipv6_renew_options(struct sock
*sk
,
314 struct ipv6_txoptions
*opt
,
316 struct ipv6_opt_hdr
*newopt
);
317 struct ipv6_txoptions
*ipv6_fixup_options(struct ipv6_txoptions
*opt_space
,
318 struct ipv6_txoptions
*opt
);
320 bool ipv6_opt_accepted(const struct sock
*sk
, const struct sk_buff
*skb
,
321 const struct inet6_skb_parm
*opt
);
322 struct ipv6_txoptions
*ipv6_update_options(struct sock
*sk
,
323 struct ipv6_txoptions
*opt
);
325 static inline bool ipv6_accept_ra(struct inet6_dev
*idev
)
327 /* If forwarding is enabled, RA are not accepted unless the special
328 * hybrid mode (accept_ra=2) is enabled.
330 return idev
->cnf
.forwarding
? idev
->cnf
.accept_ra
== 2 :
334 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
335 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
336 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
338 int __ipv6_addr_type(const struct in6_addr
*addr
);
339 static inline int ipv6_addr_type(const struct in6_addr
*addr
)
341 return __ipv6_addr_type(addr
) & 0xffff;
344 static inline int ipv6_addr_scope(const struct in6_addr
*addr
)
346 return __ipv6_addr_type(addr
) & IPV6_ADDR_SCOPE_MASK
;
349 static inline int __ipv6_addr_src_scope(int type
)
351 return (type
== IPV6_ADDR_ANY
) ? __IPV6_ADDR_SCOPE_INVALID
: (type
>> 16);
354 static inline int ipv6_addr_src_scope(const struct in6_addr
*addr
)
356 return __ipv6_addr_src_scope(__ipv6_addr_type(addr
));
359 static inline bool __ipv6_addr_needs_scope_id(int type
)
361 return type
& IPV6_ADDR_LINKLOCAL
||
362 (type
& IPV6_ADDR_MULTICAST
&&
363 (type
& (IPV6_ADDR_LOOPBACK
|IPV6_ADDR_LINKLOCAL
)));
366 static inline __u32
ipv6_iface_scope_id(const struct in6_addr
*addr
, int iface
)
368 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr
)) ? iface
: 0;
371 static inline int ipv6_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
373 return memcmp(a1
, a2
, sizeof(struct in6_addr
));
377 ipv6_masked_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*m
,
378 const struct in6_addr
*a2
)
380 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
381 const unsigned long *ul1
= (const unsigned long *)a1
;
382 const unsigned long *ulm
= (const unsigned long *)m
;
383 const unsigned long *ul2
= (const unsigned long *)a2
;
385 return !!(((ul1
[0] ^ ul2
[0]) & ulm
[0]) |
386 ((ul1
[1] ^ ul2
[1]) & ulm
[1]));
388 return !!(((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) & m
->s6_addr32
[0]) |
389 ((a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) & m
->s6_addr32
[1]) |
390 ((a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) & m
->s6_addr32
[2]) |
391 ((a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3]) & m
->s6_addr32
[3]));
395 static inline void ipv6_addr_prefix(struct in6_addr
*pfx
,
396 const struct in6_addr
*addr
,
399 /* caller must guarantee 0 <= plen <= 128 */
403 memset(pfx
->s6_addr
, 0, sizeof(pfx
->s6_addr
));
404 memcpy(pfx
->s6_addr
, addr
, o
);
406 pfx
->s6_addr
[o
] = addr
->s6_addr
[o
] & (0xff00 >> b
);
409 static inline void ipv6_addr_prefix_copy(struct in6_addr
*addr
,
410 const struct in6_addr
*pfx
,
413 /* caller must guarantee 0 <= plen <= 128 */
417 memcpy(addr
->s6_addr
, pfx
, o
);
419 addr
->s6_addr
[o
] &= ~(0xff00 >> b
);
420 addr
->s6_addr
[o
] |= (pfx
->s6_addr
[o
] & (0xff00 >> b
));
424 static inline void __ipv6_addr_set_half(__be32
*addr
,
425 __be32 wh
, __be32 wl
)
427 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
428 #if defined(__BIG_ENDIAN)
429 if (__builtin_constant_p(wh
) && __builtin_constant_p(wl
)) {
430 *(__force u64
*)addr
= ((__force u64
)(wh
) << 32 | (__force u64
)(wl
));
433 #elif defined(__LITTLE_ENDIAN)
434 if (__builtin_constant_p(wl
) && __builtin_constant_p(wh
)) {
435 *(__force u64
*)addr
= ((__force u64
)(wl
) << 32 | (__force u64
)(wh
));
444 static inline void ipv6_addr_set(struct in6_addr
*addr
,
445 __be32 w1
, __be32 w2
,
446 __be32 w3
, __be32 w4
)
448 __ipv6_addr_set_half(&addr
->s6_addr32
[0], w1
, w2
);
449 __ipv6_addr_set_half(&addr
->s6_addr32
[2], w3
, w4
);
452 static inline bool ipv6_addr_equal(const struct in6_addr
*a1
,
453 const struct in6_addr
*a2
)
455 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
456 const unsigned long *ul1
= (const unsigned long *)a1
;
457 const unsigned long *ul2
= (const unsigned long *)a2
;
459 return ((ul1
[0] ^ ul2
[0]) | (ul1
[1] ^ ul2
[1])) == 0UL;
461 return ((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) |
462 (a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) |
463 (a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) |
464 (a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3])) == 0;
468 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
469 static inline bool __ipv6_prefix_equal64_half(const __be64
*a1
,
473 if (len
&& ((*a1
^ *a2
) & cpu_to_be64((~0UL) << (64 - len
))))
478 static inline bool ipv6_prefix_equal(const struct in6_addr
*addr1
,
479 const struct in6_addr
*addr2
,
480 unsigned int prefixlen
)
482 const __be64
*a1
= (const __be64
*)addr1
;
483 const __be64
*a2
= (const __be64
*)addr2
;
485 if (prefixlen
>= 64) {
488 return __ipv6_prefix_equal64_half(a1
+ 1, a2
+ 1, prefixlen
- 64);
490 return __ipv6_prefix_equal64_half(a1
, a2
, prefixlen
);
493 static inline bool ipv6_prefix_equal(const struct in6_addr
*addr1
,
494 const struct in6_addr
*addr2
,
495 unsigned int prefixlen
)
497 const __be32
*a1
= addr1
->s6_addr32
;
498 const __be32
*a2
= addr2
->s6_addr32
;
499 unsigned int pdw
, pbi
;
501 /* check complete u32 in prefix */
502 pdw
= prefixlen
>> 5;
503 if (pdw
&& memcmp(a1
, a2
, pdw
<< 2))
506 /* check incomplete u32 in prefix */
507 pbi
= prefixlen
& 0x1f;
508 if (pbi
&& ((a1
[pdw
] ^ a2
[pdw
]) & htonl((0xffffffff) << (32 - pbi
))))
515 struct inet_frag_queue
;
517 enum ip6_defrag_users
{
518 IP6_DEFRAG_LOCAL_DELIVER
,
519 IP6_DEFRAG_CONNTRACK_IN
,
520 __IP6_DEFRAG_CONNTRACK_IN
= IP6_DEFRAG_CONNTRACK_IN
+ USHRT_MAX
,
521 IP6_DEFRAG_CONNTRACK_OUT
,
522 __IP6_DEFRAG_CONNTRACK_OUT
= IP6_DEFRAG_CONNTRACK_OUT
+ USHRT_MAX
,
523 IP6_DEFRAG_CONNTRACK_BRIDGE_IN
,
524 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN
= IP6_DEFRAG_CONNTRACK_BRIDGE_IN
+ USHRT_MAX
,
527 void ip6_frag_init(struct inet_frag_queue
*q
, const void *a
);
528 extern const struct rhashtable_params ip6_rhash_params
;
531 * Equivalent of ipv4 struct ip
534 struct inet_frag_queue q
;
542 void ip6_expire_frag_queue(struct net
*net
, struct frag_queue
*fq
);
544 static inline bool ipv6_addr_any(const struct in6_addr
*a
)
546 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
547 const unsigned long *ul
= (const unsigned long *)a
;
549 return (ul
[0] | ul
[1]) == 0UL;
551 return (a
->s6_addr32
[0] | a
->s6_addr32
[1] |
552 a
->s6_addr32
[2] | a
->s6_addr32
[3]) == 0;
556 static inline u32
ipv6_addr_hash(const struct in6_addr
*a
)
558 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
559 const unsigned long *ul
= (const unsigned long *)a
;
560 unsigned long x
= ul
[0] ^ ul
[1];
562 return (u32
)(x
^ (x
>> 32));
564 return (__force u32
)(a
->s6_addr32
[0] ^ a
->s6_addr32
[1] ^
565 a
->s6_addr32
[2] ^ a
->s6_addr32
[3]);
569 /* more secured version of ipv6_addr_hash() */
570 static inline u32
__ipv6_addr_jhash(const struct in6_addr
*a
, const u32 initval
)
572 u32 v
= (__force u32
)a
->s6_addr32
[0] ^ (__force u32
)a
->s6_addr32
[1];
574 return jhash_3words(v
,
575 (__force u32
)a
->s6_addr32
[2],
576 (__force u32
)a
->s6_addr32
[3],
580 static inline bool ipv6_addr_loopback(const struct in6_addr
*a
)
582 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
583 const __be64
*be
= (const __be64
*)a
;
585 return (be
[0] | (be
[1] ^ cpu_to_be64(1))) == 0UL;
587 return (a
->s6_addr32
[0] | a
->s6_addr32
[1] |
588 a
->s6_addr32
[2] | (a
->s6_addr32
[3] ^ cpu_to_be32(1))) == 0;
593 * Note that we must __force cast these to unsigned long to make sparse happy,
594 * since all of the endian-annotated types are fixed size regardless of arch.
596 static inline bool ipv6_addr_v4mapped(const struct in6_addr
*a
)
599 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
600 *(unsigned long *)a
|
602 (__force
unsigned long)(a
->s6_addr32
[0] | a
->s6_addr32
[1]) |
604 (__force
unsigned long)(a
->s6_addr32
[2] ^
605 cpu_to_be32(0x0000ffff))) == 0UL;
609 * Check for a RFC 4843 ORCHID address
610 * (Overlay Routable Cryptographic Hash Identifiers)
612 static inline bool ipv6_addr_orchid(const struct in6_addr
*a
)
614 return (a
->s6_addr32
[0] & htonl(0xfffffff0)) == htonl(0x20010010);
617 static inline bool ipv6_addr_is_multicast(const struct in6_addr
*addr
)
619 return (addr
->s6_addr32
[0] & htonl(0xFF000000)) == htonl(0xFF000000);
622 static inline void ipv6_addr_set_v4mapped(const __be32 addr
,
623 struct in6_addr
*v4mapped
)
625 ipv6_addr_set(v4mapped
,
632 * find the first different bit between two addresses
633 * length of address must be a multiple of 32bits
635 static inline int __ipv6_addr_diff32(const void *token1
, const void *token2
, int addrlen
)
637 const __be32
*a1
= token1
, *a2
= token2
;
642 for (i
= 0; i
< addrlen
; i
++) {
643 __be32 xb
= a1
[i
] ^ a2
[i
];
645 return i
* 32 + 31 - __fls(ntohl(xb
));
649 * we should *never* get to this point since that
650 * would mean the addrs are equal
652 * However, we do get to it 8) And exacly, when
653 * addresses are equal 8)
655 * ip route add 1111::/128 via ...
656 * ip route add 1111::/64 via ...
659 * Ideally, this function should stop comparison
660 * at prefix length. It does not, but it is still OK,
661 * if returned value is greater than prefix length.
667 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
668 static inline int __ipv6_addr_diff64(const void *token1
, const void *token2
, int addrlen
)
670 const __be64
*a1
= token1
, *a2
= token2
;
675 for (i
= 0; i
< addrlen
; i
++) {
676 __be64 xb
= a1
[i
] ^ a2
[i
];
678 return i
* 64 + 63 - __fls(be64_to_cpu(xb
));
685 static inline int __ipv6_addr_diff(const void *token1
, const void *token2
, int addrlen
)
687 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
688 if (__builtin_constant_p(addrlen
) && !(addrlen
& 7))
689 return __ipv6_addr_diff64(token1
, token2
, addrlen
);
691 return __ipv6_addr_diff32(token1
, token2
, addrlen
);
694 static inline int ipv6_addr_diff(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
696 return __ipv6_addr_diff(a1
, a2
, sizeof(struct in6_addr
));
699 __be32
ipv6_select_ident(struct net
*net
,
700 const struct in6_addr
*daddr
,
701 const struct in6_addr
*saddr
);
702 __be32
ipv6_proxy_select_ident(struct net
*net
, struct sk_buff
*skb
);
704 int ip6_dst_hoplimit(struct dst_entry
*dst
);
706 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo
*np
, struct flowi6
*fl6
,
707 struct dst_entry
*dst
)
711 if (ipv6_addr_is_multicast(&fl6
->daddr
))
712 hlimit
= np
->mcast_hops
;
714 hlimit
= np
->hop_limit
;
716 hlimit
= ip6_dst_hoplimit(dst
);
720 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
721 * Equivalent to : flow->v6addrs.src = iph->saddr;
722 * flow->v6addrs.dst = iph->daddr;
724 static inline void iph_to_flow_copy_v6addrs(struct flow_keys
*flow
,
725 const struct ipv6hdr
*iph
)
727 BUILD_BUG_ON(offsetof(typeof(flow
->addrs
), v6addrs
.dst
) !=
728 offsetof(typeof(flow
->addrs
), v6addrs
.src
) +
729 sizeof(flow
->addrs
.v6addrs
.src
));
730 memcpy(&flow
->addrs
.v6addrs
, &iph
->saddr
, sizeof(flow
->addrs
.v6addrs
));
731 flow
->control
.addr_type
= FLOW_DISSECTOR_KEY_IPV6_ADDRS
;
734 #if IS_ENABLED(CONFIG_IPV6)
736 /* Sysctl settings for net ipv6.auto_flowlabels */
737 #define IP6_AUTO_FLOW_LABEL_OFF 0
738 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
739 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
740 #define IP6_AUTO_FLOW_LABEL_FORCED 3
742 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
744 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
746 static inline __be32
ip6_make_flowlabel(struct net
*net
, struct sk_buff
*skb
,
747 __be32 flowlabel
, bool autolabel
,
752 /* @flowlabel may include more than a flow label, eg, the traffic class.
753 * Here we want only the flow label value.
755 flowlabel
&= IPV6_FLOWLABEL_MASK
;
758 net
->ipv6
.sysctl
.auto_flowlabels
== IP6_AUTO_FLOW_LABEL_OFF
||
760 net
->ipv6
.sysctl
.auto_flowlabels
!= IP6_AUTO_FLOW_LABEL_FORCED
))
763 hash
= skb_get_hash_flowi6(skb
, fl6
);
765 /* Since this is being sent on the wire obfuscate hash a bit
766 * to minimize possbility that any useful information to an
767 * attacker is leaked. Only lower 20 bits are relevant.
769 hash
= rol32(hash
, 16);
771 flowlabel
= (__force __be32
)hash
& IPV6_FLOWLABEL_MASK
;
773 if (net
->ipv6
.sysctl
.flowlabel_state_ranges
)
774 flowlabel
|= IPV6_FLOWLABEL_STATELESS_FLAG
;
779 static inline int ip6_default_np_autolabel(struct net
*net
)
781 switch (net
->ipv6
.sysctl
.auto_flowlabels
) {
782 case IP6_AUTO_FLOW_LABEL_OFF
:
783 case IP6_AUTO_FLOW_LABEL_OPTIN
:
786 case IP6_AUTO_FLOW_LABEL_OPTOUT
:
787 case IP6_AUTO_FLOW_LABEL_FORCED
:
792 static inline void ip6_set_txhash(struct sock
*sk
) { }
793 static inline __be32
ip6_make_flowlabel(struct net
*net
, struct sk_buff
*skb
,
794 __be32 flowlabel
, bool autolabel
,
799 static inline int ip6_default_np_autolabel(struct net
*net
)
807 * Header manipulation
809 static inline void ip6_flow_hdr(struct ipv6hdr
*hdr
, unsigned int tclass
,
812 *(__be32
*)hdr
= htonl(0x60000000 | (tclass
<< 20)) | flowlabel
;
815 static inline __be32
ip6_flowinfo(const struct ipv6hdr
*hdr
)
817 return *(__be32
*)hdr
& IPV6_FLOWINFO_MASK
;
820 static inline __be32
ip6_flowlabel(const struct ipv6hdr
*hdr
)
822 return *(__be32
*)hdr
& IPV6_FLOWLABEL_MASK
;
825 static inline u8
ip6_tclass(__be32 flowinfo
)
827 return ntohl(flowinfo
& IPV6_TCLASS_MASK
) >> IPV6_TCLASS_SHIFT
;
830 static inline __be32
ip6_make_flowinfo(unsigned int tclass
, __be32 flowlabel
)
832 return htonl(tclass
<< IPV6_TCLASS_SHIFT
) | flowlabel
;
835 static inline __be32
flowi6_get_flowlabel(const struct flowi6
*fl6
)
837 return fl6
->flowlabel
& IPV6_FLOWLABEL_MASK
;
841 * Prototypes exported by ipv6
845 * rcv function (called from netdevice level)
848 int ipv6_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
849 struct packet_type
*pt
, struct net_device
*orig_dev
);
851 int ip6_rcv_finish(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
854 * upper-layer output functions
856 int ip6_xmit(const struct sock
*sk
, struct sk_buff
*skb
, struct flowi6
*fl6
,
857 __u32 mark
, struct ipv6_txoptions
*opt
, int tclass
);
859 int ip6_find_1stfragopt(struct sk_buff
*skb
, u8
**nexthdr
);
861 int ip6_append_data(struct sock
*sk
,
862 int getfrag(void *from
, char *to
, int offset
, int len
,
863 int odd
, struct sk_buff
*skb
),
864 void *from
, int length
, int transhdrlen
,
865 struct ipcm6_cookie
*ipc6
, struct flowi6
*fl6
,
866 struct rt6_info
*rt
, unsigned int flags
,
867 const struct sockcm_cookie
*sockc
);
869 int ip6_push_pending_frames(struct sock
*sk
);
871 void ip6_flush_pending_frames(struct sock
*sk
);
873 int ip6_send_skb(struct sk_buff
*skb
);
875 struct sk_buff
*__ip6_make_skb(struct sock
*sk
, struct sk_buff_head
*queue
,
876 struct inet_cork_full
*cork
,
877 struct inet6_cork
*v6_cork
);
878 struct sk_buff
*ip6_make_skb(struct sock
*sk
,
879 int getfrag(void *from
, char *to
, int offset
,
880 int len
, int odd
, struct sk_buff
*skb
),
881 void *from
, int length
, int transhdrlen
,
882 struct ipcm6_cookie
*ipc6
, struct flowi6
*fl6
,
883 struct rt6_info
*rt
, unsigned int flags
,
884 const struct sockcm_cookie
*sockc
);
886 static inline struct sk_buff
*ip6_finish_skb(struct sock
*sk
)
888 return __ip6_make_skb(sk
, &sk
->sk_write_queue
, &inet_sk(sk
)->cork
,
889 &inet6_sk(sk
)->cork
);
892 int ip6_dst_lookup(struct net
*net
, struct sock
*sk
, struct dst_entry
**dst
,
894 struct dst_entry
*ip6_dst_lookup_flow(const struct sock
*sk
, struct flowi6
*fl6
,
895 const struct in6_addr
*final_dst
);
896 struct dst_entry
*ip6_sk_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
897 const struct in6_addr
*final_dst
);
898 struct dst_entry
*ip6_blackhole_route(struct net
*net
,
899 struct dst_entry
*orig_dst
);
902 * skb processing functions
905 int ip6_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
906 int ip6_forward(struct sk_buff
*skb
);
907 int ip6_input(struct sk_buff
*skb
);
908 int ip6_mc_input(struct sk_buff
*skb
);
910 int __ip6_local_out(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
911 int ip6_local_out(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
914 * Extension header (options) processing
917 void ipv6_push_nfrag_opts(struct sk_buff
*skb
, struct ipv6_txoptions
*opt
,
918 u8
*proto
, struct in6_addr
**daddr_p
,
919 struct in6_addr
*saddr
);
920 void ipv6_push_frag_opts(struct sk_buff
*skb
, struct ipv6_txoptions
*opt
,
923 int ipv6_skip_exthdr(const struct sk_buff
*, int start
, u8
*nexthdrp
,
926 bool ipv6_ext_hdr(u8 nexthdr
);
929 IP6_FH_F_FRAG
= (1 << 0),
930 IP6_FH_F_AUTH
= (1 << 1),
931 IP6_FH_F_SKIP_RH
= (1 << 2),
934 /* find specified header and get offset to it */
935 int ipv6_find_hdr(const struct sk_buff
*skb
, unsigned int *offset
, int target
,
936 unsigned short *fragoff
, int *fragflg
);
938 int ipv6_find_tlv(const struct sk_buff
*skb
, int offset
, int type
);
940 struct in6_addr
*fl6_update_dst(struct flowi6
*fl6
,
941 const struct ipv6_txoptions
*opt
,
942 struct in6_addr
*orig
);
945 * socket options (ipv6_sockglue.c)
948 int ipv6_setsockopt(struct sock
*sk
, int level
, int optname
,
949 char __user
*optval
, unsigned int optlen
);
950 int ipv6_getsockopt(struct sock
*sk
, int level
, int optname
,
951 char __user
*optval
, int __user
*optlen
);
952 int compat_ipv6_setsockopt(struct sock
*sk
, int level
, int optname
,
953 char __user
*optval
, unsigned int optlen
);
954 int compat_ipv6_getsockopt(struct sock
*sk
, int level
, int optname
,
955 char __user
*optval
, int __user
*optlen
);
957 int __ip6_datagram_connect(struct sock
*sk
, struct sockaddr
*addr
,
959 int ip6_datagram_connect(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
);
960 int ip6_datagram_connect_v6_only(struct sock
*sk
, struct sockaddr
*addr
,
962 int ip6_datagram_dst_update(struct sock
*sk
, bool fix_sk_saddr
);
963 void ip6_datagram_release_cb(struct sock
*sk
);
965 int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
,
967 int ipv6_recv_rxpmtu(struct sock
*sk
, struct msghdr
*msg
, int len
,
969 void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
, __be16 port
,
970 u32 info
, u8
*payload
);
971 void ipv6_local_error(struct sock
*sk
, int err
, struct flowi6
*fl6
, u32 info
);
972 void ipv6_local_rxpmtu(struct sock
*sk
, struct flowi6
*fl6
, u32 mtu
);
974 int inet6_release(struct socket
*sock
);
975 int inet6_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
);
976 int inet6_getname(struct socket
*sock
, struct sockaddr
*uaddr
, int *uaddr_len
,
978 int inet6_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
);
980 int inet6_hash_connect(struct inet_timewait_death_row
*death_row
,
986 extern const struct proto_ops inet6_stream_ops
;
987 extern const struct proto_ops inet6_dgram_ops
;
988 extern const struct proto_ops inet6_sockraw_ops
;
990 struct group_source_req
;
993 int ip6_mc_source(int add
, int omode
, struct sock
*sk
,
994 struct group_source_req
*pgsr
);
995 int ip6_mc_msfilter(struct sock
*sk
, struct group_filter
*gsf
);
996 int ip6_mc_msfget(struct sock
*sk
, struct group_filter
*gsf
,
997 struct group_filter __user
*optval
, int __user
*optlen
);
999 #ifdef CONFIG_PROC_FS
1000 int ac6_proc_init(struct net
*net
);
1001 void ac6_proc_exit(struct net
*net
);
1002 int raw6_proc_init(void);
1003 void raw6_proc_exit(void);
1004 int tcp6_proc_init(struct net
*net
);
1005 void tcp6_proc_exit(struct net
*net
);
1006 int udp6_proc_init(struct net
*net
);
1007 void udp6_proc_exit(struct net
*net
);
1008 int udplite6_proc_init(void);
1009 void udplite6_proc_exit(void);
1010 int ipv6_misc_proc_init(void);
1011 void ipv6_misc_proc_exit(void);
1012 int snmp6_register_dev(struct inet6_dev
*idev
);
1013 int snmp6_unregister_dev(struct inet6_dev
*idev
);
1016 static inline int ac6_proc_init(struct net
*net
) { return 0; }
1017 static inline void ac6_proc_exit(struct net
*net
) { }
1018 static inline int snmp6_register_dev(struct inet6_dev
*idev
) { return 0; }
1019 static inline int snmp6_unregister_dev(struct inet6_dev
*idev
) { return 0; }
1022 #ifdef CONFIG_SYSCTL
1023 extern struct ctl_table ipv6_route_table_template
[];
1025 struct ctl_table
*ipv6_icmp_sysctl_init(struct net
*net
);
1026 struct ctl_table
*ipv6_route_sysctl_init(struct net
*net
);
1027 int ipv6_sysctl_register(void);
1028 void ipv6_sysctl_unregister(void);
1031 int ipv6_sock_mc_join(struct sock
*sk
, int ifindex
,
1032 const struct in6_addr
*addr
);
1033 int ipv6_sock_mc_drop(struct sock
*sk
, int ifindex
,
1034 const struct in6_addr
*addr
);
1035 #endif /* _NET_IPV6_H */