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>
22 #include <net/flow_keys.h>
25 #define SIN6_LEN_RFC2133 24
27 #define IPV6_MAXPLEN 65535
30 * NextHeader field of IPv6 header
33 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
34 #define NEXTHDR_TCP 6 /* TCP segment. */
35 #define NEXTHDR_UDP 17 /* UDP message. */
36 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
37 #define NEXTHDR_ROUTING 43 /* Routing header. */
38 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
39 #define NEXTHDR_GRE 47 /* GRE header. */
40 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
41 #define NEXTHDR_AUTH 51 /* Authentication header. */
42 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
43 #define NEXTHDR_NONE 59 /* No next header */
44 #define NEXTHDR_DEST 60 /* Destination options header. */
45 #define NEXTHDR_SCTP 132 /* SCTP message. */
46 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
48 #define NEXTHDR_MAX 255
52 #define IPV6_DEFAULT_HOPLIMIT 64
53 #define IPV6_DEFAULT_MCASTHOPS 1
58 * type - unicast | multicast
59 * scope - local | site | global
66 #define IPV6_ADDR_ANY 0x0000U
68 #define IPV6_ADDR_UNICAST 0x0001U
69 #define IPV6_ADDR_MULTICAST 0x0002U
71 #define IPV6_ADDR_LOOPBACK 0x0010U
72 #define IPV6_ADDR_LINKLOCAL 0x0020U
73 #define IPV6_ADDR_SITELOCAL 0x0040U
75 #define IPV6_ADDR_COMPATv4 0x0080U
77 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
79 #define IPV6_ADDR_MAPPED 0x1000U
84 #define IPV6_ADDR_MC_SCOPE(a) \
85 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
86 #define __IPV6_ADDR_SCOPE_INVALID -1
87 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
88 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
89 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
90 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
91 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
96 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
97 ((a)->s6_addr[1] & 0x10)
98 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
99 ((a)->s6_addr[1] & 0x20)
100 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
101 ((a)->s6_addr[1] & 0x40)
104 * fragmentation header
111 __be32 identification
;
114 #define IP6_MF 0x0001
115 #define IP6_OFFSET 0xFFF8
117 #define IP6_REPLY_MARK(net, mark) \
118 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
120 #include <net/sock.h>
123 extern int sysctl_mld_max_msf
;
125 #define _DEVINC(net, statname, modifier, idev, field) \
127 struct inet6_dev *_idev = (idev); \
128 if (likely(_idev != NULL)) \
129 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
130 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
133 /* per device counters are atomic_long_t */
134 #define _DEVINCATOMIC(net, statname, modifier, 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 SNMP_INC_STATS##modifier((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, modifier, idev, field, val) \
153 struct inet6_dev *_idev = (idev); \
154 if (likely(_idev != NULL)) \
155 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
156 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
159 #define _DEVUPD(net, statname, modifier, idev, field, val) \
161 struct inet6_dev *_idev = (idev); \
162 if (likely(_idev != NULL)) \
163 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
164 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
169 #define IP6_INC_STATS(net, idev,field) \
170 _DEVINC(net, ipv6, 64, idev, field)
171 #define IP6_INC_STATS_BH(net, idev,field) \
172 _DEVINC(net, ipv6, 64_BH, idev, field)
173 #define IP6_ADD_STATS(net, idev,field,val) \
174 _DEVADD(net, ipv6, 64, idev, field, val)
175 #define IP6_ADD_STATS_BH(net, idev,field,val) \
176 _DEVADD(net, ipv6, 64_BH, idev, field, val)
177 #define IP6_UPD_PO_STATS(net, idev,field,val) \
178 _DEVUPD(net, ipv6, 64, idev, field, val)
179 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
180 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
181 #define ICMP6_INC_STATS(net, idev, field) \
182 _DEVINCATOMIC(net, icmpv6, , idev, field)
183 #define ICMP6_INC_STATS_BH(net, idev, field) \
184 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
186 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
187 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
188 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
189 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
190 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
191 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
193 struct ip6_ra_chain
{
194 struct ip6_ra_chain
*next
;
197 void (*destructor
)(struct sock
*);
200 extern struct ip6_ra_chain
*ip6_ra_chain
;
201 extern rwlock_t ip6_ra_lock
;
204 This structure is prepared by protocol, when parsing
205 ancillary data and passed to IPv6.
208 struct ipv6_txoptions
{
209 /* Length of this structure */
212 /* length of extension headers */
214 __u16 opt_flen
; /* after fragment hdr */
215 __u16 opt_nflen
; /* before fragment hdr */
217 struct ipv6_opt_hdr
*hopopt
;
218 struct ipv6_opt_hdr
*dst0opt
;
219 struct ipv6_rt_hdr
*srcrt
; /* Routing Header */
220 struct ipv6_opt_hdr
*dst1opt
;
222 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
225 struct ip6_flowlabel
{
226 struct ip6_flowlabel __rcu
*next
;
230 struct ipv6_txoptions
*opt
;
231 unsigned long linger
;
238 unsigned long lastuse
;
239 unsigned long expires
;
243 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
244 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
245 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
246 #define IPV6_TCLASS_SHIFT 20
248 struct ipv6_fl_socklist
{
249 struct ipv6_fl_socklist __rcu
*next
;
250 struct ip6_flowlabel
*fl
;
254 struct ip6_flowlabel
*fl6_sock_lookup(struct sock
*sk
, __be32 label
);
255 struct ipv6_txoptions
*fl6_merge_options(struct ipv6_txoptions
*opt_space
,
256 struct ip6_flowlabel
*fl
,
257 struct ipv6_txoptions
*fopt
);
258 void fl6_free_socklist(struct sock
*sk
);
259 int ipv6_flowlabel_opt(struct sock
*sk
, char __user
*optval
, int optlen
);
260 int ipv6_flowlabel_opt_get(struct sock
*sk
, struct in6_flowlabel_req
*freq
,
262 int ip6_flowlabel_init(void);
263 void ip6_flowlabel_cleanup(void);
265 static inline void fl6_sock_release(struct ip6_flowlabel
*fl
)
268 atomic_dec(&fl
->users
);
271 void icmpv6_notify(struct sk_buff
*skb
, u8 type
, u8 code
, __be32 info
);
273 int icmpv6_push_pending_frames(struct sock
*sk
, struct flowi6
*fl6
,
274 struct icmp6hdr
*thdr
, int len
);
276 int ip6_ra_control(struct sock
*sk
, int sel
);
278 int ipv6_parse_hopopts(struct sk_buff
*skb
);
280 struct ipv6_txoptions
*ipv6_dup_options(struct sock
*sk
,
281 struct ipv6_txoptions
*opt
);
282 struct ipv6_txoptions
*ipv6_renew_options(struct sock
*sk
,
283 struct ipv6_txoptions
*opt
,
285 struct ipv6_opt_hdr __user
*newopt
,
287 struct ipv6_txoptions
*ipv6_fixup_options(struct ipv6_txoptions
*opt_space
,
288 struct ipv6_txoptions
*opt
);
290 bool ipv6_opt_accepted(const struct sock
*sk
, const struct sk_buff
*skb
);
292 static inline bool ipv6_accept_ra(struct inet6_dev
*idev
)
294 /* If forwarding is enabled, RA are not accepted unless the special
295 * hybrid mode (accept_ra=2) is enabled.
297 return idev
->cnf
.forwarding
? idev
->cnf
.accept_ra
== 2 :
301 #if IS_ENABLED(CONFIG_IPV6)
302 static inline int ip6_frag_mem(struct net
*net
)
304 return sum_frag_mem_limit(&net
->ipv6
.frags
);
308 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
309 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
310 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
312 int __ipv6_addr_type(const struct in6_addr
*addr
);
313 static inline int ipv6_addr_type(const struct in6_addr
*addr
)
315 return __ipv6_addr_type(addr
) & 0xffff;
318 static inline int ipv6_addr_scope(const struct in6_addr
*addr
)
320 return __ipv6_addr_type(addr
) & IPV6_ADDR_SCOPE_MASK
;
323 static inline int __ipv6_addr_src_scope(int type
)
325 return (type
== IPV6_ADDR_ANY
) ? __IPV6_ADDR_SCOPE_INVALID
: (type
>> 16);
328 static inline int ipv6_addr_src_scope(const struct in6_addr
*addr
)
330 return __ipv6_addr_src_scope(__ipv6_addr_type(addr
));
333 static inline bool __ipv6_addr_needs_scope_id(int type
)
335 return type
& IPV6_ADDR_LINKLOCAL
||
336 (type
& IPV6_ADDR_MULTICAST
&&
337 (type
& (IPV6_ADDR_LOOPBACK
|IPV6_ADDR_LINKLOCAL
)));
340 static inline __u32
ipv6_iface_scope_id(const struct in6_addr
*addr
, int iface
)
342 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr
)) ? iface
: 0;
345 static inline int ipv6_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
347 return memcmp(a1
, a2
, sizeof(struct in6_addr
));
351 ipv6_masked_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*m
,
352 const struct in6_addr
*a2
)
354 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
355 const unsigned long *ul1
= (const unsigned long *)a1
;
356 const unsigned long *ulm
= (const unsigned long *)m
;
357 const unsigned long *ul2
= (const unsigned long *)a2
;
359 return !!(((ul1
[0] ^ ul2
[0]) & ulm
[0]) |
360 ((ul1
[1] ^ ul2
[1]) & ulm
[1]));
362 return !!(((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) & m
->s6_addr32
[0]) |
363 ((a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) & m
->s6_addr32
[1]) |
364 ((a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) & m
->s6_addr32
[2]) |
365 ((a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3]) & m
->s6_addr32
[3]));
369 static inline void ipv6_addr_prefix(struct in6_addr
*pfx
,
370 const struct in6_addr
*addr
,
373 /* caller must guarantee 0 <= plen <= 128 */
377 memset(pfx
->s6_addr
, 0, sizeof(pfx
->s6_addr
));
378 memcpy(pfx
->s6_addr
, addr
, o
);
380 pfx
->s6_addr
[o
] = addr
->s6_addr
[o
] & (0xff00 >> b
);
383 static inline void __ipv6_addr_set_half(__be32
*addr
,
384 __be32 wh
, __be32 wl
)
386 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
387 #if defined(__BIG_ENDIAN)
388 if (__builtin_constant_p(wh
) && __builtin_constant_p(wl
)) {
389 *(__force u64
*)addr
= ((__force u64
)(wh
) << 32 | (__force u64
)(wl
));
392 #elif defined(__LITTLE_ENDIAN)
393 if (__builtin_constant_p(wl
) && __builtin_constant_p(wh
)) {
394 *(__force u64
*)addr
= ((__force u64
)(wl
) << 32 | (__force u64
)(wh
));
403 static inline void ipv6_addr_set(struct in6_addr
*addr
,
404 __be32 w1
, __be32 w2
,
405 __be32 w3
, __be32 w4
)
407 __ipv6_addr_set_half(&addr
->s6_addr32
[0], w1
, w2
);
408 __ipv6_addr_set_half(&addr
->s6_addr32
[2], w3
, w4
);
411 static inline bool ipv6_addr_equal(const struct in6_addr
*a1
,
412 const struct in6_addr
*a2
)
414 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
415 const unsigned long *ul1
= (const unsigned long *)a1
;
416 const unsigned long *ul2
= (const unsigned long *)a2
;
418 return ((ul1
[0] ^ ul2
[0]) | (ul1
[1] ^ ul2
[1])) == 0UL;
420 return ((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) |
421 (a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) |
422 (a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) |
423 (a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3])) == 0;
427 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
428 static inline bool __ipv6_prefix_equal64_half(const __be64
*a1
,
432 if (len
&& ((*a1
^ *a2
) & cpu_to_be64((~0UL) << (64 - len
))))
437 static inline bool ipv6_prefix_equal(const struct in6_addr
*addr1
,
438 const struct in6_addr
*addr2
,
439 unsigned int prefixlen
)
441 const __be64
*a1
= (const __be64
*)addr1
;
442 const __be64
*a2
= (const __be64
*)addr2
;
444 if (prefixlen
>= 64) {
447 return __ipv6_prefix_equal64_half(a1
+ 1, a2
+ 1, prefixlen
- 64);
449 return __ipv6_prefix_equal64_half(a1
, a2
, prefixlen
);
452 static inline bool ipv6_prefix_equal(const struct in6_addr
*addr1
,
453 const struct in6_addr
*addr2
,
454 unsigned int prefixlen
)
456 const __be32
*a1
= addr1
->s6_addr32
;
457 const __be32
*a2
= addr2
->s6_addr32
;
458 unsigned int pdw
, pbi
;
460 /* check complete u32 in prefix */
461 pdw
= prefixlen
>> 5;
462 if (pdw
&& memcmp(a1
, a2
, pdw
<< 2))
465 /* check incomplete u32 in prefix */
466 pbi
= prefixlen
& 0x1f;
467 if (pbi
&& ((a1
[pdw
] ^ a2
[pdw
]) & htonl((0xffffffff) << (32 - pbi
))))
474 struct inet_frag_queue
;
476 enum ip6_defrag_users
{
477 IP6_DEFRAG_LOCAL_DELIVER
,
478 IP6_DEFRAG_CONNTRACK_IN
,
479 __IP6_DEFRAG_CONNTRACK_IN
= IP6_DEFRAG_CONNTRACK_IN
+ USHRT_MAX
,
480 IP6_DEFRAG_CONNTRACK_OUT
,
481 __IP6_DEFRAG_CONNTRACK_OUT
= IP6_DEFRAG_CONNTRACK_OUT
+ USHRT_MAX
,
482 IP6_DEFRAG_CONNTRACK_BRIDGE_IN
,
483 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN
= IP6_DEFRAG_CONNTRACK_BRIDGE_IN
+ USHRT_MAX
,
486 struct ip6_create_arg
{
489 const struct in6_addr
*src
;
490 const struct in6_addr
*dst
;
494 void ip6_frag_init(struct inet_frag_queue
*q
, const void *a
);
495 bool ip6_frag_match(const struct inet_frag_queue
*q
, const void *a
);
498 * Equivalent of ipv4 struct ip
501 struct inet_frag_queue q
;
503 __be32 id
; /* fragment id */
505 struct in6_addr saddr
;
506 struct in6_addr daddr
;
514 void ip6_expire_frag_queue(struct net
*net
, struct frag_queue
*fq
,
515 struct inet_frags
*frags
);
517 static inline bool ipv6_addr_any(const struct in6_addr
*a
)
519 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
520 const unsigned long *ul
= (const unsigned long *)a
;
522 return (ul
[0] | ul
[1]) == 0UL;
524 return (a
->s6_addr32
[0] | a
->s6_addr32
[1] |
525 a
->s6_addr32
[2] | a
->s6_addr32
[3]) == 0;
529 static inline u32
ipv6_addr_hash(const struct in6_addr
*a
)
531 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
532 const unsigned long *ul
= (const unsigned long *)a
;
533 unsigned long x
= ul
[0] ^ ul
[1];
535 return (u32
)(x
^ (x
>> 32));
537 return (__force u32
)(a
->s6_addr32
[0] ^ a
->s6_addr32
[1] ^
538 a
->s6_addr32
[2] ^ a
->s6_addr32
[3]);
542 /* more secured version of ipv6_addr_hash() */
543 static inline u32
__ipv6_addr_jhash(const struct in6_addr
*a
, const u32 initval
)
545 u32 v
= (__force u32
)a
->s6_addr32
[0] ^ (__force u32
)a
->s6_addr32
[1];
547 return jhash_3words(v
,
548 (__force u32
)a
->s6_addr32
[2],
549 (__force u32
)a
->s6_addr32
[3],
553 static inline bool ipv6_addr_loopback(const struct in6_addr
*a
)
555 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
556 const __be64
*be
= (const __be64
*)a
;
558 return (be
[0] | (be
[1] ^ cpu_to_be64(1))) == 0UL;
560 return (a
->s6_addr32
[0] | a
->s6_addr32
[1] |
561 a
->s6_addr32
[2] | (a
->s6_addr32
[3] ^ cpu_to_be32(1))) == 0;
566 * Note that we must __force cast these to unsigned long to make sparse happy,
567 * since all of the endian-annotated types are fixed size regardless of arch.
569 static inline bool ipv6_addr_v4mapped(const struct in6_addr
*a
)
572 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
573 *(unsigned long *)a
|
575 (__force
unsigned long)(a
->s6_addr32
[0] | a
->s6_addr32
[1]) |
577 (__force
unsigned long)(a
->s6_addr32
[2] ^
578 cpu_to_be32(0x0000ffff))) == 0UL;
582 * Check for a RFC 4843 ORCHID address
583 * (Overlay Routable Cryptographic Hash Identifiers)
585 static inline bool ipv6_addr_orchid(const struct in6_addr
*a
)
587 return (a
->s6_addr32
[0] & htonl(0xfffffff0)) == htonl(0x20010010);
590 static inline bool ipv6_addr_is_multicast(const struct in6_addr
*addr
)
592 return (addr
->s6_addr32
[0] & htonl(0xFF000000)) == htonl(0xFF000000);
595 static inline void ipv6_addr_set_v4mapped(const __be32 addr
,
596 struct in6_addr
*v4mapped
)
598 ipv6_addr_set(v4mapped
,
605 * find the first different bit between two addresses
606 * length of address must be a multiple of 32bits
608 static inline int __ipv6_addr_diff32(const void *token1
, const void *token2
, int addrlen
)
610 const __be32
*a1
= token1
, *a2
= token2
;
615 for (i
= 0; i
< addrlen
; i
++) {
616 __be32 xb
= a1
[i
] ^ a2
[i
];
618 return i
* 32 + 31 - __fls(ntohl(xb
));
622 * we should *never* get to this point since that
623 * would mean the addrs are equal
625 * However, we do get to it 8) And exacly, when
626 * addresses are equal 8)
628 * ip route add 1111::/128 via ...
629 * ip route add 1111::/64 via ...
632 * Ideally, this function should stop comparison
633 * at prefix length. It does not, but it is still OK,
634 * if returned value is greater than prefix length.
640 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
641 static inline int __ipv6_addr_diff64(const void *token1
, const void *token2
, int addrlen
)
643 const __be64
*a1
= token1
, *a2
= token2
;
648 for (i
= 0; i
< addrlen
; i
++) {
649 __be64 xb
= a1
[i
] ^ a2
[i
];
651 return i
* 64 + 63 - __fls(be64_to_cpu(xb
));
658 static inline int __ipv6_addr_diff(const void *token1
, const void *token2
, int addrlen
)
660 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
661 if (__builtin_constant_p(addrlen
) && !(addrlen
& 7))
662 return __ipv6_addr_diff64(token1
, token2
, addrlen
);
664 return __ipv6_addr_diff32(token1
, token2
, addrlen
);
667 static inline int ipv6_addr_diff(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
669 return __ipv6_addr_diff(a1
, a2
, sizeof(struct in6_addr
));
672 int ip6_dst_hoplimit(struct dst_entry
*dst
);
674 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo
*np
, struct flowi6
*fl6
,
675 struct dst_entry
*dst
)
679 if (ipv6_addr_is_multicast(&fl6
->daddr
))
680 hlimit
= np
->mcast_hops
;
682 hlimit
= np
->hop_limit
;
684 hlimit
= ip6_dst_hoplimit(dst
);
688 #if IS_ENABLED(CONFIG_IPV6)
689 static inline void ip6_set_txhash(struct sock
*sk
)
691 struct inet_sock
*inet
= inet_sk(sk
);
692 struct ipv6_pinfo
*np
= inet6_sk(sk
);
693 struct flow_keys keys
;
695 keys
.src
= (__force __be32
)ipv6_addr_hash(&np
->saddr
);
696 keys
.dst
= (__force __be32
)ipv6_addr_hash(&sk
->sk_v6_daddr
);
697 keys
.port16
[0] = inet
->inet_sport
;
698 keys
.port16
[1] = inet
->inet_dport
;
700 sk
->sk_txhash
= flow_hash_from_keys(&keys
);
703 static inline __be32
ip6_make_flowlabel(struct net
*net
, struct sk_buff
*skb
,
704 __be32 flowlabel
, bool autolabel
)
706 if (!flowlabel
&& (autolabel
|| net
->ipv6
.sysctl
.auto_flowlabels
)) {
709 hash
= skb_get_hash(skb
);
711 /* Since this is being sent on the wire obfuscate hash a bit
712 * to minimize possbility that any useful information to an
713 * attacker is leaked. Only lower 20 bits are relevant.
717 flowlabel
= hash
& IPV6_FLOWLABEL_MASK
;
723 static inline void ip6_set_txhash(struct sock
*sk
) { }
724 static inline __be32
ip6_make_flowlabel(struct net
*net
, struct sk_buff
*skb
,
725 __be32 flowlabel
, bool autolabel
)
733 * Header manipulation
735 static inline void ip6_flow_hdr(struct ipv6hdr
*hdr
, unsigned int tclass
,
738 *(__be32
*)hdr
= htonl(0x60000000 | (tclass
<< 20)) | flowlabel
;
741 static inline __be32
ip6_flowinfo(const struct ipv6hdr
*hdr
)
743 return *(__be32
*)hdr
& IPV6_FLOWINFO_MASK
;
746 static inline __be32
ip6_flowlabel(const struct ipv6hdr
*hdr
)
748 return *(__be32
*)hdr
& IPV6_FLOWLABEL_MASK
;
751 static inline u8
ip6_tclass(__be32 flowinfo
)
753 return ntohl(flowinfo
& IPV6_TCLASS_MASK
) >> IPV6_TCLASS_SHIFT
;
756 * Prototypes exported by ipv6
760 * rcv function (called from netdevice level)
763 int ipv6_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
764 struct packet_type
*pt
, struct net_device
*orig_dev
);
766 int ip6_rcv_finish(struct sk_buff
*skb
);
769 * upper-layer output functions
771 int ip6_xmit(struct sock
*sk
, struct sk_buff
*skb
, struct flowi6
*fl6
,
772 struct ipv6_txoptions
*opt
, int tclass
);
774 int ip6_find_1stfragopt(struct sk_buff
*skb
, u8
**nexthdr
);
776 int ip6_append_data(struct sock
*sk
,
777 int getfrag(void *from
, char *to
, int offset
, int len
,
778 int odd
, struct sk_buff
*skb
),
779 void *from
, int length
, int transhdrlen
, int hlimit
,
780 int tclass
, struct ipv6_txoptions
*opt
, struct flowi6
*fl6
,
781 struct rt6_info
*rt
, unsigned int flags
, int dontfrag
);
783 int ip6_push_pending_frames(struct sock
*sk
);
785 void ip6_flush_pending_frames(struct sock
*sk
);
787 int ip6_dst_lookup(struct sock
*sk
, struct dst_entry
**dst
, struct flowi6
*fl6
);
788 struct dst_entry
*ip6_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
789 const struct in6_addr
*final_dst
);
790 struct dst_entry
*ip6_sk_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
791 const struct in6_addr
*final_dst
);
792 struct dst_entry
*ip6_blackhole_route(struct net
*net
,
793 struct dst_entry
*orig_dst
);
796 * skb processing functions
799 int ip6_output(struct sock
*sk
, struct sk_buff
*skb
);
800 int ip6_forward(struct sk_buff
*skb
);
801 int ip6_input(struct sk_buff
*skb
);
802 int ip6_mc_input(struct sk_buff
*skb
);
804 int __ip6_local_out(struct sk_buff
*skb
);
805 int ip6_local_out(struct sk_buff
*skb
);
808 * Extension header (options) processing
811 void ipv6_push_nfrag_opts(struct sk_buff
*skb
, struct ipv6_txoptions
*opt
,
812 u8
*proto
, struct in6_addr
**daddr_p
);
813 void ipv6_push_frag_opts(struct sk_buff
*skb
, struct ipv6_txoptions
*opt
,
816 int ipv6_skip_exthdr(const struct sk_buff
*, int start
, u8
*nexthdrp
,
819 bool ipv6_ext_hdr(u8 nexthdr
);
822 IP6_FH_F_FRAG
= (1 << 0),
823 IP6_FH_F_AUTH
= (1 << 1),
824 IP6_FH_F_SKIP_RH
= (1 << 2),
827 /* find specified header and get offset to it */
828 int ipv6_find_hdr(const struct sk_buff
*skb
, unsigned int *offset
, int target
,
829 unsigned short *fragoff
, int *fragflg
);
831 int ipv6_find_tlv(struct sk_buff
*skb
, int offset
, int type
);
833 struct in6_addr
*fl6_update_dst(struct flowi6
*fl6
,
834 const struct ipv6_txoptions
*opt
,
835 struct in6_addr
*orig
);
838 * socket options (ipv6_sockglue.c)
841 int ipv6_setsockopt(struct sock
*sk
, int level
, int optname
,
842 char __user
*optval
, unsigned int optlen
);
843 int ipv6_getsockopt(struct sock
*sk
, int level
, int optname
,
844 char __user
*optval
, int __user
*optlen
);
845 int compat_ipv6_setsockopt(struct sock
*sk
, int level
, int optname
,
846 char __user
*optval
, unsigned int optlen
);
847 int compat_ipv6_getsockopt(struct sock
*sk
, int level
, int optname
,
848 char __user
*optval
, int __user
*optlen
);
850 int ip6_datagram_connect(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
);
851 int ip6_datagram_connect_v6_only(struct sock
*sk
, struct sockaddr
*addr
,
854 int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
,
856 int ipv6_recv_rxpmtu(struct sock
*sk
, struct msghdr
*msg
, int len
,
858 void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
, __be16 port
,
859 u32 info
, u8
*payload
);
860 void ipv6_local_error(struct sock
*sk
, int err
, struct flowi6
*fl6
, u32 info
);
861 void ipv6_local_rxpmtu(struct sock
*sk
, struct flowi6
*fl6
, u32 mtu
);
863 int inet6_release(struct socket
*sock
);
864 int inet6_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
);
865 int inet6_getname(struct socket
*sock
, struct sockaddr
*uaddr
, int *uaddr_len
,
867 int inet6_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
);
869 int inet6_hash_connect(struct inet_timewait_death_row
*death_row
,
875 extern const struct proto_ops inet6_stream_ops
;
876 extern const struct proto_ops inet6_dgram_ops
;
878 struct group_source_req
;
881 int ip6_mc_source(int add
, int omode
, struct sock
*sk
,
882 struct group_source_req
*pgsr
);
883 int ip6_mc_msfilter(struct sock
*sk
, struct group_filter
*gsf
);
884 int ip6_mc_msfget(struct sock
*sk
, struct group_filter
*gsf
,
885 struct group_filter __user
*optval
, int __user
*optlen
);
887 #ifdef CONFIG_PROC_FS
888 int ac6_proc_init(struct net
*net
);
889 void ac6_proc_exit(struct net
*net
);
890 int raw6_proc_init(void);
891 void raw6_proc_exit(void);
892 int tcp6_proc_init(struct net
*net
);
893 void tcp6_proc_exit(struct net
*net
);
894 int udp6_proc_init(struct net
*net
);
895 void udp6_proc_exit(struct net
*net
);
896 int udplite6_proc_init(void);
897 void udplite6_proc_exit(void);
898 int ipv6_misc_proc_init(void);
899 void ipv6_misc_proc_exit(void);
900 int snmp6_register_dev(struct inet6_dev
*idev
);
901 int snmp6_unregister_dev(struct inet6_dev
*idev
);
904 static inline int ac6_proc_init(struct net
*net
) { return 0; }
905 static inline void ac6_proc_exit(struct net
*net
) { }
906 static inline int snmp6_register_dev(struct inet6_dev
*idev
) { return 0; }
907 static inline int snmp6_unregister_dev(struct inet6_dev
*idev
) { return 0; }
911 extern struct ctl_table ipv6_route_table_template
[];
913 struct ctl_table
*ipv6_icmp_sysctl_init(struct net
*net
);
914 struct ctl_table
*ipv6_route_sysctl_init(struct net
*net
);
915 int ipv6_sysctl_register(void);
916 void ipv6_sysctl_unregister(void);
919 #endif /* _NET_IPV6_H */