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>
25 #include <net/netns/hash.h>
27 #define SIN6_LEN_RFC2133 24
29 #define IPV6_MAXPLEN 65535
32 * NextHeader field of IPv6 header
35 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
36 #define NEXTHDR_TCP 6 /* TCP segment. */
37 #define NEXTHDR_UDP 17 /* UDP message. */
38 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
39 #define NEXTHDR_ROUTING 43 /* Routing header. */
40 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
41 #define NEXTHDR_GRE 47 /* GRE header. */
42 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
43 #define NEXTHDR_AUTH 51 /* Authentication header. */
44 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
45 #define NEXTHDR_NONE 59 /* No next header */
46 #define NEXTHDR_DEST 60 /* Destination options header. */
47 #define NEXTHDR_SCTP 132 /* SCTP message. */
48 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
50 #define NEXTHDR_MAX 255
52 #define IPV6_DEFAULT_HOPLIMIT 64
53 #define IPV6_DEFAULT_MCASTHOPS 1
55 /* Limits on Hop-by-Hop and Destination options.
57 * Per RFC8200 there is no limit on the maximum number or lengths of options in
58 * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
59 * We allow configurable limits in order to mitigate potential denial of
62 * There are three limits that may be set:
63 * - Limit the number of options in a Hop-by-Hop or Destination options
65 * - Limit the byte length of a Hop-by-Hop or Destination options extension
67 * - Disallow unknown options
69 * The limits are expressed in corresponding sysctls:
71 * ipv6.sysctl.max_dst_opts_cnt
72 * ipv6.sysctl.max_hbh_opts_cnt
73 * ipv6.sysctl.max_dst_opts_len
74 * ipv6.sysctl.max_hbh_opts_len
76 * max_*_opts_cnt is the number of TLVs that are allowed for Destination
77 * options or Hop-by-Hop options. If the number is less than zero then unknown
78 * TLVs are disallowed and the number of known options that are allowed is the
79 * absolute value. Setting the value to INT_MAX indicates no limit.
81 * max_*_opts_len is the length limit in bytes of a Destination or
82 * Hop-by-Hop options extension header. Setting the value to INT_MAX
83 * indicates no length limit.
85 * If a limit is exceeded when processing an extension header the packet is
89 /* Default limits for Hop-by-Hop and Destination options */
90 #define IP6_DEFAULT_MAX_DST_OPTS_CNT 8
91 #define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8
92 #define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */
93 #define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */
98 * type - unicast | multicast
99 * scope - local | site | global
106 #define IPV6_ADDR_ANY 0x0000U
108 #define IPV6_ADDR_UNICAST 0x0001U
109 #define IPV6_ADDR_MULTICAST 0x0002U
111 #define IPV6_ADDR_LOOPBACK 0x0010U
112 #define IPV6_ADDR_LINKLOCAL 0x0020U
113 #define IPV6_ADDR_SITELOCAL 0x0040U
115 #define IPV6_ADDR_COMPATv4 0x0080U
117 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
119 #define IPV6_ADDR_MAPPED 0x1000U
124 #define IPV6_ADDR_MC_SCOPE(a) \
125 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
126 #define __IPV6_ADDR_SCOPE_INVALID -1
127 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
128 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
129 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
130 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
131 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
136 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
137 ((a)->s6_addr[1] & 0x10)
138 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
139 ((a)->s6_addr[1] & 0x20)
140 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
141 ((a)->s6_addr[1] & 0x40)
144 * fragmentation header
151 __be32 identification
;
154 #define IP6_MF 0x0001
155 #define IP6_OFFSET 0xFFF8
157 #define IP6_REPLY_MARK(net, mark) \
158 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
160 #include <net/sock.h>
163 extern int sysctl_mld_max_msf
;
164 extern int sysctl_mld_qrv
;
166 #define _DEVINC(net, statname, mod, idev, field) \
168 struct inet6_dev *_idev = (idev); \
169 if (likely(_idev != NULL)) \
170 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
171 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
174 /* per device counters are atomic_long_t */
175 #define _DEVINCATOMIC(net, statname, mod, idev, field) \
177 struct inet6_dev *_idev = (idev); \
178 if (likely(_idev != NULL)) \
179 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
180 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
183 /* per device and per net counters are atomic_long_t */
184 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
186 struct inet6_dev *_idev = (idev); \
187 if (likely(_idev != NULL)) \
188 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
189 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
192 #define _DEVADD(net, statname, mod, idev, field, val) \
194 struct inet6_dev *_idev = (idev); \
195 if (likely(_idev != NULL)) \
196 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
197 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
200 #define _DEVUPD(net, statname, mod, idev, field, val) \
202 struct inet6_dev *_idev = (idev); \
203 if (likely(_idev != NULL)) \
204 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
205 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
210 #define IP6_INC_STATS(net, idev,field) \
211 _DEVINC(net, ipv6, , idev, field)
212 #define __IP6_INC_STATS(net, idev,field) \
213 _DEVINC(net, ipv6, __, idev, field)
214 #define IP6_ADD_STATS(net, idev,field,val) \
215 _DEVADD(net, ipv6, , idev, field, val)
216 #define __IP6_ADD_STATS(net, idev,field,val) \
217 _DEVADD(net, ipv6, __, idev, field, val)
218 #define IP6_UPD_PO_STATS(net, idev,field,val) \
219 _DEVUPD(net, ipv6, , idev, field, val)
220 #define __IP6_UPD_PO_STATS(net, idev,field,val) \
221 _DEVUPD(net, ipv6, __, idev, field, val)
222 #define ICMP6_INC_STATS(net, idev, field) \
223 _DEVINCATOMIC(net, icmpv6, , idev, field)
224 #define __ICMP6_INC_STATS(net, idev, field) \
225 _DEVINCATOMIC(net, icmpv6, __, idev, field)
227 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
228 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
229 #define ICMP6MSGIN_INC_STATS(net, idev, field) \
230 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
232 struct ip6_ra_chain
{
233 struct ip6_ra_chain
*next
;
236 void (*destructor
)(struct sock
*);
239 extern struct ip6_ra_chain
*ip6_ra_chain
;
240 extern rwlock_t ip6_ra_lock
;
243 This structure is prepared by protocol, when parsing
244 ancillary data and passed to IPv6.
247 struct ipv6_txoptions
{
249 /* Length of this structure */
252 /* length of extension headers */
254 __u16 opt_flen
; /* after fragment hdr */
255 __u16 opt_nflen
; /* before fragment hdr */
257 struct ipv6_opt_hdr
*hopopt
;
258 struct ipv6_opt_hdr
*dst0opt
;
259 struct ipv6_rt_hdr
*srcrt
; /* Routing Header */
260 struct ipv6_opt_hdr
*dst1opt
;
262 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
265 struct ip6_flowlabel
{
266 struct ip6_flowlabel __rcu
*next
;
270 struct ipv6_txoptions
*opt
;
271 unsigned long linger
;
278 unsigned long lastuse
;
279 unsigned long expires
;
283 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
284 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
285 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
287 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
288 #define IPV6_TCLASS_SHIFT 20
290 struct ipv6_fl_socklist
{
291 struct ipv6_fl_socklist __rcu
*next
;
292 struct ip6_flowlabel
*fl
;
296 struct ipcm6_cookie
{
300 struct ipv6_txoptions
*opt
;
303 static inline struct ipv6_txoptions
*txopt_get(const struct ipv6_pinfo
*np
)
305 struct ipv6_txoptions
*opt
;
308 opt
= rcu_dereference(np
->opt
);
310 if (!refcount_inc_not_zero(&opt
->refcnt
))
313 opt
= rcu_pointer_handoff(opt
);
319 static inline void txopt_put(struct ipv6_txoptions
*opt
)
321 if (opt
&& refcount_dec_and_test(&opt
->refcnt
))
325 struct ip6_flowlabel
*fl6_sock_lookup(struct sock
*sk
, __be32 label
);
326 struct ipv6_txoptions
*fl6_merge_options(struct ipv6_txoptions
*opt_space
,
327 struct ip6_flowlabel
*fl
,
328 struct ipv6_txoptions
*fopt
);
329 void fl6_free_socklist(struct sock
*sk
);
330 int ipv6_flowlabel_opt(struct sock
*sk
, char __user
*optval
, int optlen
);
331 int ipv6_flowlabel_opt_get(struct sock
*sk
, struct in6_flowlabel_req
*freq
,
333 int ip6_flowlabel_init(void);
334 void ip6_flowlabel_cleanup(void);
335 bool ip6_autoflowlabel(struct net
*net
, const struct ipv6_pinfo
*np
);
337 static inline void fl6_sock_release(struct ip6_flowlabel
*fl
)
340 atomic_dec(&fl
->users
);
343 void icmpv6_notify(struct sk_buff
*skb
, u8 type
, u8 code
, __be32 info
);
345 void icmpv6_push_pending_frames(struct sock
*sk
, struct flowi6
*fl6
,
346 struct icmp6hdr
*thdr
, int len
);
348 int ip6_ra_control(struct sock
*sk
, int sel
);
350 int ipv6_parse_hopopts(struct sk_buff
*skb
);
352 struct ipv6_txoptions
*ipv6_dup_options(struct sock
*sk
,
353 struct ipv6_txoptions
*opt
);
354 struct ipv6_txoptions
*ipv6_renew_options(struct sock
*sk
,
355 struct ipv6_txoptions
*opt
,
357 struct ipv6_opt_hdr __user
*newopt
,
359 struct ipv6_txoptions
*
360 ipv6_renew_options_kern(struct sock
*sk
,
361 struct ipv6_txoptions
*opt
,
363 struct ipv6_opt_hdr
*newopt
,
365 struct ipv6_txoptions
*ipv6_fixup_options(struct ipv6_txoptions
*opt_space
,
366 struct ipv6_txoptions
*opt
);
368 bool ipv6_opt_accepted(const struct sock
*sk
, const struct sk_buff
*skb
,
369 const struct inet6_skb_parm
*opt
);
370 struct ipv6_txoptions
*ipv6_update_options(struct sock
*sk
,
371 struct ipv6_txoptions
*opt
);
373 static inline bool ipv6_accept_ra(struct inet6_dev
*idev
)
375 /* If forwarding is enabled, RA are not accepted unless the special
376 * hybrid mode (accept_ra=2) is enabled.
378 return idev
->cnf
.forwarding
? idev
->cnf
.accept_ra
== 2 :
382 #if IS_ENABLED(CONFIG_IPV6)
383 static inline int ip6_frag_mem(struct net
*net
)
385 return sum_frag_mem_limit(&net
->ipv6
.frags
);
389 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
390 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
391 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
393 int __ipv6_addr_type(const struct in6_addr
*addr
);
394 static inline int ipv6_addr_type(const struct in6_addr
*addr
)
396 return __ipv6_addr_type(addr
) & 0xffff;
399 static inline int ipv6_addr_scope(const struct in6_addr
*addr
)
401 return __ipv6_addr_type(addr
) & IPV6_ADDR_SCOPE_MASK
;
404 static inline int __ipv6_addr_src_scope(int type
)
406 return (type
== IPV6_ADDR_ANY
) ? __IPV6_ADDR_SCOPE_INVALID
: (type
>> 16);
409 static inline int ipv6_addr_src_scope(const struct in6_addr
*addr
)
411 return __ipv6_addr_src_scope(__ipv6_addr_type(addr
));
414 static inline bool __ipv6_addr_needs_scope_id(int type
)
416 return type
& IPV6_ADDR_LINKLOCAL
||
417 (type
& IPV6_ADDR_MULTICAST
&&
418 (type
& (IPV6_ADDR_LOOPBACK
|IPV6_ADDR_LINKLOCAL
)));
421 static inline __u32
ipv6_iface_scope_id(const struct in6_addr
*addr
, int iface
)
423 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr
)) ? iface
: 0;
426 static inline int ipv6_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
428 return memcmp(a1
, a2
, sizeof(struct in6_addr
));
432 ipv6_masked_addr_cmp(const struct in6_addr
*a1
, const struct in6_addr
*m
,
433 const struct in6_addr
*a2
)
435 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
436 const unsigned long *ul1
= (const unsigned long *)a1
;
437 const unsigned long *ulm
= (const unsigned long *)m
;
438 const unsigned long *ul2
= (const unsigned long *)a2
;
440 return !!(((ul1
[0] ^ ul2
[0]) & ulm
[0]) |
441 ((ul1
[1] ^ ul2
[1]) & ulm
[1]));
443 return !!(((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) & m
->s6_addr32
[0]) |
444 ((a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) & m
->s6_addr32
[1]) |
445 ((a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) & m
->s6_addr32
[2]) |
446 ((a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3]) & m
->s6_addr32
[3]));
450 static inline void ipv6_addr_prefix(struct in6_addr
*pfx
,
451 const struct in6_addr
*addr
,
454 /* caller must guarantee 0 <= plen <= 128 */
458 memset(pfx
->s6_addr
, 0, sizeof(pfx
->s6_addr
));
459 memcpy(pfx
->s6_addr
, addr
, o
);
461 pfx
->s6_addr
[o
] = addr
->s6_addr
[o
] & (0xff00 >> b
);
464 static inline void ipv6_addr_prefix_copy(struct in6_addr
*addr
,
465 const struct in6_addr
*pfx
,
468 /* caller must guarantee 0 <= plen <= 128 */
472 memcpy(addr
->s6_addr
, pfx
, o
);
474 addr
->s6_addr
[o
] &= ~(0xff00 >> b
);
475 addr
->s6_addr
[o
] |= (pfx
->s6_addr
[o
] & (0xff00 >> b
));
479 static inline void __ipv6_addr_set_half(__be32
*addr
,
480 __be32 wh
, __be32 wl
)
482 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
483 #if defined(__BIG_ENDIAN)
484 if (__builtin_constant_p(wh
) && __builtin_constant_p(wl
)) {
485 *(__force u64
*)addr
= ((__force u64
)(wh
) << 32 | (__force u64
)(wl
));
488 #elif defined(__LITTLE_ENDIAN)
489 if (__builtin_constant_p(wl
) && __builtin_constant_p(wh
)) {
490 *(__force u64
*)addr
= ((__force u64
)(wl
) << 32 | (__force u64
)(wh
));
499 static inline void ipv6_addr_set(struct in6_addr
*addr
,
500 __be32 w1
, __be32 w2
,
501 __be32 w3
, __be32 w4
)
503 __ipv6_addr_set_half(&addr
->s6_addr32
[0], w1
, w2
);
504 __ipv6_addr_set_half(&addr
->s6_addr32
[2], w3
, w4
);
507 static inline bool ipv6_addr_equal(const struct in6_addr
*a1
,
508 const struct in6_addr
*a2
)
510 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
511 const unsigned long *ul1
= (const unsigned long *)a1
;
512 const unsigned long *ul2
= (const unsigned long *)a2
;
514 return ((ul1
[0] ^ ul2
[0]) | (ul1
[1] ^ ul2
[1])) == 0UL;
516 return ((a1
->s6_addr32
[0] ^ a2
->s6_addr32
[0]) |
517 (a1
->s6_addr32
[1] ^ a2
->s6_addr32
[1]) |
518 (a1
->s6_addr32
[2] ^ a2
->s6_addr32
[2]) |
519 (a1
->s6_addr32
[3] ^ a2
->s6_addr32
[3])) == 0;
523 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
524 static inline bool __ipv6_prefix_equal64_half(const __be64
*a1
,
528 if (len
&& ((*a1
^ *a2
) & cpu_to_be64((~0UL) << (64 - len
))))
533 static inline bool ipv6_prefix_equal(const struct in6_addr
*addr1
,
534 const struct in6_addr
*addr2
,
535 unsigned int prefixlen
)
537 const __be64
*a1
= (const __be64
*)addr1
;
538 const __be64
*a2
= (const __be64
*)addr2
;
540 if (prefixlen
>= 64) {
543 return __ipv6_prefix_equal64_half(a1
+ 1, a2
+ 1, prefixlen
- 64);
545 return __ipv6_prefix_equal64_half(a1
, a2
, prefixlen
);
548 static inline bool ipv6_prefix_equal(const struct in6_addr
*addr1
,
549 const struct in6_addr
*addr2
,
550 unsigned int prefixlen
)
552 const __be32
*a1
= addr1
->s6_addr32
;
553 const __be32
*a2
= addr2
->s6_addr32
;
554 unsigned int pdw
, pbi
;
556 /* check complete u32 in prefix */
557 pdw
= prefixlen
>> 5;
558 if (pdw
&& memcmp(a1
, a2
, pdw
<< 2))
561 /* check incomplete u32 in prefix */
562 pbi
= prefixlen
& 0x1f;
563 if (pbi
&& ((a1
[pdw
] ^ a2
[pdw
]) & htonl((0xffffffff) << (32 - pbi
))))
570 struct inet_frag_queue
;
572 enum ip6_defrag_users
{
573 IP6_DEFRAG_LOCAL_DELIVER
,
574 IP6_DEFRAG_CONNTRACK_IN
,
575 __IP6_DEFRAG_CONNTRACK_IN
= IP6_DEFRAG_CONNTRACK_IN
+ USHRT_MAX
,
576 IP6_DEFRAG_CONNTRACK_OUT
,
577 __IP6_DEFRAG_CONNTRACK_OUT
= IP6_DEFRAG_CONNTRACK_OUT
+ USHRT_MAX
,
578 IP6_DEFRAG_CONNTRACK_BRIDGE_IN
,
579 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN
= IP6_DEFRAG_CONNTRACK_BRIDGE_IN
+ USHRT_MAX
,
582 struct ip6_create_arg
{
585 const struct in6_addr
*src
;
586 const struct in6_addr
*dst
;
591 void ip6_frag_init(struct inet_frag_queue
*q
, const void *a
);
592 bool ip6_frag_match(const struct inet_frag_queue
*q
, const void *a
);
595 * Equivalent of ipv4 struct ip
598 struct inet_frag_queue q
;
600 __be32 id
; /* fragment id */
602 struct in6_addr saddr
;
603 struct in6_addr daddr
;
611 void ip6_expire_frag_queue(struct net
*net
, struct frag_queue
*fq
,
612 struct inet_frags
*frags
);
614 static inline bool ipv6_addr_any(const struct in6_addr
*a
)
616 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
617 const unsigned long *ul
= (const unsigned long *)a
;
619 return (ul
[0] | ul
[1]) == 0UL;
621 return (a
->s6_addr32
[0] | a
->s6_addr32
[1] |
622 a
->s6_addr32
[2] | a
->s6_addr32
[3]) == 0;
626 static inline u32
ipv6_addr_hash(const struct in6_addr
*a
)
628 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
629 const unsigned long *ul
= (const unsigned long *)a
;
630 unsigned long x
= ul
[0] ^ ul
[1];
632 return (u32
)(x
^ (x
>> 32));
634 return (__force u32
)(a
->s6_addr32
[0] ^ a
->s6_addr32
[1] ^
635 a
->s6_addr32
[2] ^ a
->s6_addr32
[3]);
639 /* more secured version of ipv6_addr_hash() */
640 static inline u32
__ipv6_addr_jhash(const struct in6_addr
*a
, const u32 initval
)
642 u32 v
= (__force u32
)a
->s6_addr32
[0] ^ (__force u32
)a
->s6_addr32
[1];
644 return jhash_3words(v
,
645 (__force u32
)a
->s6_addr32
[2],
646 (__force u32
)a
->s6_addr32
[3],
650 static inline bool ipv6_addr_loopback(const struct in6_addr
*a
)
652 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
653 const __be64
*be
= (const __be64
*)a
;
655 return (be
[0] | (be
[1] ^ cpu_to_be64(1))) == 0UL;
657 return (a
->s6_addr32
[0] | a
->s6_addr32
[1] |
658 a
->s6_addr32
[2] | (a
->s6_addr32
[3] ^ cpu_to_be32(1))) == 0;
663 * Note that we must __force cast these to unsigned long to make sparse happy,
664 * since all of the endian-annotated types are fixed size regardless of arch.
666 static inline bool ipv6_addr_v4mapped(const struct in6_addr
*a
)
669 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
670 *(unsigned long *)a
|
672 (__force
unsigned long)(a
->s6_addr32
[0] | a
->s6_addr32
[1]) |
674 (__force
unsigned long)(a
->s6_addr32
[2] ^
675 cpu_to_be32(0x0000ffff))) == 0UL;
678 static inline u32
ipv6_portaddr_hash(const struct net
*net
,
679 const struct in6_addr
*addr6
,
682 unsigned int hash
, mix
= net_hash_mix(net
);
684 if (ipv6_addr_any(addr6
))
685 hash
= jhash_1word(0, mix
);
686 else if (ipv6_addr_v4mapped(addr6
))
687 hash
= jhash_1word((__force u32
)addr6
->s6_addr32
[3], mix
);
689 hash
= jhash2((__force u32
*)addr6
->s6_addr32
, 4, mix
);
695 * Check for a RFC 4843 ORCHID address
696 * (Overlay Routable Cryptographic Hash Identifiers)
698 static inline bool ipv6_addr_orchid(const struct in6_addr
*a
)
700 return (a
->s6_addr32
[0] & htonl(0xfffffff0)) == htonl(0x20010010);
703 static inline bool ipv6_addr_is_multicast(const struct in6_addr
*addr
)
705 return (addr
->s6_addr32
[0] & htonl(0xFF000000)) == htonl(0xFF000000);
708 static inline void ipv6_addr_set_v4mapped(const __be32 addr
,
709 struct in6_addr
*v4mapped
)
711 ipv6_addr_set(v4mapped
,
718 * find the first different bit between two addresses
719 * length of address must be a multiple of 32bits
721 static inline int __ipv6_addr_diff32(const void *token1
, const void *token2
, int addrlen
)
723 const __be32
*a1
= token1
, *a2
= token2
;
728 for (i
= 0; i
< addrlen
; i
++) {
729 __be32 xb
= a1
[i
] ^ a2
[i
];
731 return i
* 32 + 31 - __fls(ntohl(xb
));
735 * we should *never* get to this point since that
736 * would mean the addrs are equal
738 * However, we do get to it 8) And exacly, when
739 * addresses are equal 8)
741 * ip route add 1111::/128 via ...
742 * ip route add 1111::/64 via ...
745 * Ideally, this function should stop comparison
746 * at prefix length. It does not, but it is still OK,
747 * if returned value is greater than prefix length.
753 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
754 static inline int __ipv6_addr_diff64(const void *token1
, const void *token2
, int addrlen
)
756 const __be64
*a1
= token1
, *a2
= token2
;
761 for (i
= 0; i
< addrlen
; i
++) {
762 __be64 xb
= a1
[i
] ^ a2
[i
];
764 return i
* 64 + 63 - __fls(be64_to_cpu(xb
));
771 static inline int __ipv6_addr_diff(const void *token1
, const void *token2
, int addrlen
)
773 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
774 if (__builtin_constant_p(addrlen
) && !(addrlen
& 7))
775 return __ipv6_addr_diff64(token1
, token2
, addrlen
);
777 return __ipv6_addr_diff32(token1
, token2
, addrlen
);
780 static inline int ipv6_addr_diff(const struct in6_addr
*a1
, const struct in6_addr
*a2
)
782 return __ipv6_addr_diff(a1
, a2
, sizeof(struct in6_addr
));
785 __be32
ipv6_select_ident(struct net
*net
,
786 const struct in6_addr
*daddr
,
787 const struct in6_addr
*saddr
);
788 __be32
ipv6_proxy_select_ident(struct net
*net
, struct sk_buff
*skb
);
790 int ip6_dst_hoplimit(struct dst_entry
*dst
);
792 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo
*np
, struct flowi6
*fl6
,
793 struct dst_entry
*dst
)
797 if (ipv6_addr_is_multicast(&fl6
->daddr
))
798 hlimit
= np
->mcast_hops
;
800 hlimit
= np
->hop_limit
;
802 hlimit
= ip6_dst_hoplimit(dst
);
806 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
807 * Equivalent to : flow->v6addrs.src = iph->saddr;
808 * flow->v6addrs.dst = iph->daddr;
810 static inline void iph_to_flow_copy_v6addrs(struct flow_keys
*flow
,
811 const struct ipv6hdr
*iph
)
813 BUILD_BUG_ON(offsetof(typeof(flow
->addrs
), v6addrs
.dst
) !=
814 offsetof(typeof(flow
->addrs
), v6addrs
.src
) +
815 sizeof(flow
->addrs
.v6addrs
.src
));
816 memcpy(&flow
->addrs
.v6addrs
, &iph
->saddr
, sizeof(flow
->addrs
.v6addrs
));
817 flow
->control
.addr_type
= FLOW_DISSECTOR_KEY_IPV6_ADDRS
;
820 #if IS_ENABLED(CONFIG_IPV6)
822 /* Sysctl settings for net ipv6.auto_flowlabels */
823 #define IP6_AUTO_FLOW_LABEL_OFF 0
824 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
825 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
826 #define IP6_AUTO_FLOW_LABEL_FORCED 3
828 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
830 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
832 static inline __be32
ip6_make_flowlabel(struct net
*net
, struct sk_buff
*skb
,
833 __be32 flowlabel
, bool autolabel
,
838 /* @flowlabel may include more than a flow label, eg, the traffic class.
839 * Here we want only the flow label value.
841 flowlabel
&= IPV6_FLOWLABEL_MASK
;
844 net
->ipv6
.sysctl
.auto_flowlabels
== IP6_AUTO_FLOW_LABEL_OFF
||
846 net
->ipv6
.sysctl
.auto_flowlabels
!= IP6_AUTO_FLOW_LABEL_FORCED
))
849 hash
= skb_get_hash_flowi6(skb
, fl6
);
851 /* Since this is being sent on the wire obfuscate hash a bit
852 * to minimize possbility that any useful information to an
853 * attacker is leaked. Only lower 20 bits are relevant.
857 flowlabel
= (__force __be32
)hash
& IPV6_FLOWLABEL_MASK
;
859 if (net
->ipv6
.sysctl
.flowlabel_state_ranges
)
860 flowlabel
|= IPV6_FLOWLABEL_STATELESS_FLAG
;
865 static inline int ip6_default_np_autolabel(struct net
*net
)
867 switch (net
->ipv6
.sysctl
.auto_flowlabels
) {
868 case IP6_AUTO_FLOW_LABEL_OFF
:
869 case IP6_AUTO_FLOW_LABEL_OPTIN
:
872 case IP6_AUTO_FLOW_LABEL_OPTOUT
:
873 case IP6_AUTO_FLOW_LABEL_FORCED
:
878 static inline void ip6_set_txhash(struct sock
*sk
) { }
879 static inline __be32
ip6_make_flowlabel(struct net
*net
, struct sk_buff
*skb
,
880 __be32 flowlabel
, bool autolabel
,
885 static inline int ip6_default_np_autolabel(struct net
*net
)
893 * Header manipulation
895 static inline void ip6_flow_hdr(struct ipv6hdr
*hdr
, unsigned int tclass
,
898 *(__be32
*)hdr
= htonl(0x60000000 | (tclass
<< 20)) | flowlabel
;
901 static inline __be32
ip6_flowinfo(const struct ipv6hdr
*hdr
)
903 return *(__be32
*)hdr
& IPV6_FLOWINFO_MASK
;
906 static inline __be32
ip6_flowlabel(const struct ipv6hdr
*hdr
)
908 return *(__be32
*)hdr
& IPV6_FLOWLABEL_MASK
;
911 static inline u8
ip6_tclass(__be32 flowinfo
)
913 return ntohl(flowinfo
& IPV6_TCLASS_MASK
) >> IPV6_TCLASS_SHIFT
;
916 static inline __be32
ip6_make_flowinfo(unsigned int tclass
, __be32 flowlabel
)
918 return htonl(tclass
<< IPV6_TCLASS_SHIFT
) | flowlabel
;
922 * Prototypes exported by ipv6
926 * rcv function (called from netdevice level)
929 int ipv6_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
930 struct packet_type
*pt
, struct net_device
*orig_dev
);
932 int ip6_rcv_finish(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
935 * upper-layer output functions
937 int ip6_xmit(const struct sock
*sk
, struct sk_buff
*skb
, struct flowi6
*fl6
,
938 __u32 mark
, struct ipv6_txoptions
*opt
, int tclass
);
940 int ip6_find_1stfragopt(struct sk_buff
*skb
, u8
**nexthdr
);
942 int ip6_append_data(struct sock
*sk
,
943 int getfrag(void *from
, char *to
, int offset
, int len
,
944 int odd
, struct sk_buff
*skb
),
945 void *from
, int length
, int transhdrlen
,
946 struct ipcm6_cookie
*ipc6
, struct flowi6
*fl6
,
947 struct rt6_info
*rt
, unsigned int flags
,
948 const struct sockcm_cookie
*sockc
);
950 int ip6_push_pending_frames(struct sock
*sk
);
952 void ip6_flush_pending_frames(struct sock
*sk
);
954 int ip6_send_skb(struct sk_buff
*skb
);
956 struct sk_buff
*__ip6_make_skb(struct sock
*sk
, struct sk_buff_head
*queue
,
957 struct inet_cork_full
*cork
,
958 struct inet6_cork
*v6_cork
);
959 struct sk_buff
*ip6_make_skb(struct sock
*sk
,
960 int getfrag(void *from
, char *to
, int offset
,
961 int len
, int odd
, struct sk_buff
*skb
),
962 void *from
, int length
, int transhdrlen
,
963 struct ipcm6_cookie
*ipc6
, struct flowi6
*fl6
,
964 struct rt6_info
*rt
, unsigned int flags
,
965 const struct sockcm_cookie
*sockc
);
967 static inline struct sk_buff
*ip6_finish_skb(struct sock
*sk
)
969 return __ip6_make_skb(sk
, &sk
->sk_write_queue
, &inet_sk(sk
)->cork
,
970 &inet6_sk(sk
)->cork
);
973 unsigned int ip6_dst_mtu_forward(const struct dst_entry
*dst
);
975 int ip6_dst_lookup(struct net
*net
, struct sock
*sk
, struct dst_entry
**dst
,
977 struct dst_entry
*ip6_dst_lookup_flow(const struct sock
*sk
, struct flowi6
*fl6
,
978 const struct in6_addr
*final_dst
);
979 struct dst_entry
*ip6_sk_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
980 const struct in6_addr
*final_dst
);
981 struct dst_entry
*ip6_blackhole_route(struct net
*net
,
982 struct dst_entry
*orig_dst
);
985 * skb processing functions
988 int ip6_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
989 int ip6_forward(struct sk_buff
*skb
);
990 int ip6_input(struct sk_buff
*skb
);
991 int ip6_mc_input(struct sk_buff
*skb
);
993 int __ip6_local_out(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
994 int ip6_local_out(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
997 * Extension header (options) processing
1000 void ipv6_push_nfrag_opts(struct sk_buff
*skb
, struct ipv6_txoptions
*opt
,
1001 u8
*proto
, struct in6_addr
**daddr_p
,
1002 struct in6_addr
*saddr
);
1003 void ipv6_push_frag_opts(struct sk_buff
*skb
, struct ipv6_txoptions
*opt
,
1006 int ipv6_skip_exthdr(const struct sk_buff
*, int start
, u8
*nexthdrp
,
1009 bool ipv6_ext_hdr(u8 nexthdr
);
1012 IP6_FH_F_FRAG
= (1 << 0),
1013 IP6_FH_F_AUTH
= (1 << 1),
1014 IP6_FH_F_SKIP_RH
= (1 << 2),
1017 /* find specified header and get offset to it */
1018 int ipv6_find_hdr(const struct sk_buff
*skb
, unsigned int *offset
, int target
,
1019 unsigned short *fragoff
, int *fragflg
);
1021 int ipv6_find_tlv(const struct sk_buff
*skb
, int offset
, int type
);
1023 struct in6_addr
*fl6_update_dst(struct flowi6
*fl6
,
1024 const struct ipv6_txoptions
*opt
,
1025 struct in6_addr
*orig
);
1028 * socket options (ipv6_sockglue.c)
1031 int ipv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1032 char __user
*optval
, unsigned int optlen
);
1033 int ipv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1034 char __user
*optval
, int __user
*optlen
);
1035 int compat_ipv6_setsockopt(struct sock
*sk
, int level
, int optname
,
1036 char __user
*optval
, unsigned int optlen
);
1037 int compat_ipv6_getsockopt(struct sock
*sk
, int level
, int optname
,
1038 char __user
*optval
, int __user
*optlen
);
1040 int __ip6_datagram_connect(struct sock
*sk
, struct sockaddr
*addr
,
1042 int ip6_datagram_connect(struct sock
*sk
, struct sockaddr
*addr
, int addr_len
);
1043 int ip6_datagram_connect_v6_only(struct sock
*sk
, struct sockaddr
*addr
,
1045 int ip6_datagram_dst_update(struct sock
*sk
, bool fix_sk_saddr
);
1046 void ip6_datagram_release_cb(struct sock
*sk
);
1048 int ipv6_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
,
1050 int ipv6_recv_rxpmtu(struct sock
*sk
, struct msghdr
*msg
, int len
,
1052 void ipv6_icmp_error(struct sock
*sk
, struct sk_buff
*skb
, int err
, __be16 port
,
1053 u32 info
, u8
*payload
);
1054 void ipv6_local_error(struct sock
*sk
, int err
, struct flowi6
*fl6
, u32 info
);
1055 void ipv6_local_rxpmtu(struct sock
*sk
, struct flowi6
*fl6
, u32 mtu
);
1057 int inet6_release(struct socket
*sock
);
1058 int inet6_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
);
1059 int inet6_getname(struct socket
*sock
, struct sockaddr
*uaddr
, int *uaddr_len
,
1061 int inet6_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
);
1063 int inet6_hash_connect(struct inet_timewait_death_row
*death_row
,
1069 extern const struct proto_ops inet6_stream_ops
;
1070 extern const struct proto_ops inet6_dgram_ops
;
1071 extern const struct proto_ops inet6_sockraw_ops
;
1073 struct group_source_req
;
1074 struct group_filter
;
1076 int ip6_mc_source(int add
, int omode
, struct sock
*sk
,
1077 struct group_source_req
*pgsr
);
1078 int ip6_mc_msfilter(struct sock
*sk
, struct group_filter
*gsf
);
1079 int ip6_mc_msfget(struct sock
*sk
, struct group_filter
*gsf
,
1080 struct group_filter __user
*optval
, int __user
*optlen
);
1082 #ifdef CONFIG_PROC_FS
1083 int ac6_proc_init(struct net
*net
);
1084 void ac6_proc_exit(struct net
*net
);
1085 int raw6_proc_init(void);
1086 void raw6_proc_exit(void);
1087 int tcp6_proc_init(struct net
*net
);
1088 void tcp6_proc_exit(struct net
*net
);
1089 int udp6_proc_init(struct net
*net
);
1090 void udp6_proc_exit(struct net
*net
);
1091 int udplite6_proc_init(void);
1092 void udplite6_proc_exit(void);
1093 int ipv6_misc_proc_init(void);
1094 void ipv6_misc_proc_exit(void);
1095 int snmp6_register_dev(struct inet6_dev
*idev
);
1096 int snmp6_unregister_dev(struct inet6_dev
*idev
);
1099 static inline int ac6_proc_init(struct net
*net
) { return 0; }
1100 static inline void ac6_proc_exit(struct net
*net
) { }
1101 static inline int snmp6_register_dev(struct inet6_dev
*idev
) { return 0; }
1102 static inline int snmp6_unregister_dev(struct inet6_dev
*idev
) { return 0; }
1105 #ifdef CONFIG_SYSCTL
1106 extern struct ctl_table ipv6_route_table_template
[];
1108 struct ctl_table
*ipv6_icmp_sysctl_init(struct net
*net
);
1109 struct ctl_table
*ipv6_route_sysctl_init(struct net
*net
);
1110 int ipv6_sysctl_register(void);
1111 void ipv6_sysctl_unregister(void);
1114 int ipv6_sock_mc_join(struct sock
*sk
, int ifindex
,
1115 const struct in6_addr
*addr
);
1116 int ipv6_sock_mc_drop(struct sock
*sk
, int ifindex
,
1117 const struct in6_addr
*addr
);
1118 #endif /* _NET_IPV6_H */