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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <roque@di.fc.ul.pt>
6 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 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.
11 */
12
13#ifndef _NET_IPV6_H
14#define _NET_IPV6_H
15
16#include <linux/ipv6.h>
17#include <linux/hardirq.h>
Herbert Xu20283d82007-07-30 17:05:49 -070018#include <net/if_inet6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <net/ndisc.h>
20#include <net/flow.h>
21#include <net/snmp.h>
22
23#define SIN6_LEN_RFC2133 24
24
25#define IPV6_MAXPLEN 65535
26
27/*
28 * NextHeader field of IPv6 header
29 */
30
31#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
32#define NEXTHDR_TCP 6 /* TCP segment. */
33#define NEXTHDR_UDP 17 /* UDP message. */
34#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
35#define NEXTHDR_ROUTING 43 /* Routing header. */
36#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
37#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
38#define NEXTHDR_AUTH 51 /* Authentication header. */
39#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
40#define NEXTHDR_NONE 59 /* No next header */
41#define NEXTHDR_DEST 60 /* Destination options header. */
Masahide NAKAMURA2b741652006-08-23 20:34:26 -070042#define NEXTHDR_MOBILITY 135 /* Mobility header. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44#define NEXTHDR_MAX 255
45
46
47
48#define IPV6_DEFAULT_HOPLIMIT 64
49#define IPV6_DEFAULT_MCASTHOPS 1
50
51/*
52 * Addr type
53 *
54 * type - unicast | multicast
55 * scope - local | site | global
56 * v4 - compat
57 * v4mapped
58 * any
59 * loopback
60 */
61
62#define IPV6_ADDR_ANY 0x0000U
63
64#define IPV6_ADDR_UNICAST 0x0001U
65#define IPV6_ADDR_MULTICAST 0x0002U
66
67#define IPV6_ADDR_LOOPBACK 0x0010U
68#define IPV6_ADDR_LINKLOCAL 0x0020U
69#define IPV6_ADDR_SITELOCAL 0x0040U
70
71#define IPV6_ADDR_COMPATv4 0x0080U
72
73#define IPV6_ADDR_SCOPE_MASK 0x00f0U
74
75#define IPV6_ADDR_MAPPED 0x1000U
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77/*
78 * Addr scopes
79 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070080#define IPV6_ADDR_MC_SCOPE(a) \
81 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
82#define __IPV6_ADDR_SCOPE_INVALID -1
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
84#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
85#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
86#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
87#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
88
89/*
Linus Lüssing5ced1332011-02-15 13:19:20 +000090 * Addr flags
91 */
Linus Lüssing5ced1332011-02-15 13:19:20 +000092#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
93 ((a)->s6_addr[1] & 0x10)
94#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
95 ((a)->s6_addr[1] & 0x20)
96#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
97 ((a)->s6_addr[1] & 0x40)
Linus Lüssing5ced1332011-02-15 13:19:20 +000098
99/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 * fragmentation header
101 */
102
103struct frag_hdr {
Al Viro44473a62006-11-08 00:21:46 -0800104 __u8 nexthdr;
105 __u8 reserved;
106 __be16 frag_off;
107 __be32 identification;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108};
109
110#define IP6_MF 0x0001
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112#include <net/sock.h>
113
114/* sysctls */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115extern int sysctl_mld_max_msf;
Pavel Emelyanov3d7cc2b2008-01-09 00:33:11 -0800116extern struct ctl_path net_ipv6_ctl_path[];
117
Denis V. Lunev087fe242008-10-08 10:35:11 -0700118#define _DEVINC(net, statname, modifier, idev, field) \
David L Stevens14878f72007-09-16 16:52:35 -0700119({ \
120 struct inet6_dev *_idev = (idev); \
121 if (likely(_idev != NULL)) \
122 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
Denis V. Lunev9261e532008-10-08 10:36:03 -0700123 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
David L Stevens14878f72007-09-16 16:52:35 -0700124})
125
Eric Dumazetbe281e52011-05-19 01:14:23 +0000126/* per device counters are atomic_long_t */
127#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
128({ \
129 struct inet6_dev *_idev = (idev); \
130 if (likely(_idev != NULL)) \
131 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
132 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
133})
134
Denis V. Lunev087fe242008-10-08 10:35:11 -0700135#define _DEVADD(net, statname, modifier, idev, field, val) \
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700136({ \
137 struct inet6_dev *_idev = (idev); \
138 if (likely(_idev != NULL)) \
139 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
Denis V. Lunev9261e532008-10-08 10:36:03 -0700140 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700141})
142
Neil Hormanedf391f2009-04-27 02:45:02 -0700143#define _DEVUPD(net, statname, modifier, idev, field, val) \
144({ \
145 struct inet6_dev *_idev = (idev); \
146 if (likely(_idev != NULL)) \
147 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
148 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
149})
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151/* MIBs */
David L Stevens14878f72007-09-16 16:52:35 -0700152
Denis V. Lunev087fe242008-10-08 10:35:11 -0700153#define IP6_INC_STATS(net, idev,field) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700154 _DEVINC(net, ipv6, 64, idev, field)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700155#define IP6_INC_STATS_BH(net, idev,field) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700156 _DEVINC(net, ipv6, 64_BH, idev, field)
Neil Hormanedf391f2009-04-27 02:45:02 -0700157#define IP6_ADD_STATS(net, idev,field,val) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700158 _DEVADD(net, ipv6, 64, idev, field, val)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700159#define IP6_ADD_STATS_BH(net, idev,field,val) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700160 _DEVADD(net, ipv6, 64_BH, idev, field, val)
Neil Hormanedf391f2009-04-27 02:45:02 -0700161#define IP6_UPD_PO_STATS(net, idev,field,val) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700162 _DEVUPD(net, ipv6, 64, idev, field, val)
Neil Hormanedf391f2009-04-27 02:45:02 -0700163#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700164 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700165#define ICMP6_INC_STATS(net, idev, field) \
Eric Dumazetbe281e52011-05-19 01:14:23 +0000166 _DEVINCATOMIC(net, icmpv6, , idev, field)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700167#define ICMP6_INC_STATS_BH(net, idev, field) \
Eric Dumazetbe281e52011-05-19 01:14:23 +0000168 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
David L Stevens14878f72007-09-16 16:52:35 -0700169
Denis V. Lunev087fe242008-10-08 10:35:11 -0700170#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
Eric Dumazetbe281e52011-05-19 01:14:23 +0000171 _DEVINCATOMIC(net, icmpv6msg, , idev, field +256)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700172#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
Eric Dumazetbe281e52011-05-19 01:14:23 +0000173 _DEVINCATOMIC(net, icmpv6msg, _BH, idev, field +256)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700174#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
Eric Dumazetbe281e52011-05-19 01:14:23 +0000175 _DEVINCATOMIC(net, icmpv6msg, _BH, idev, field)
David L Stevens14878f72007-09-16 16:52:35 -0700176
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000177struct ip6_ra_chain {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 struct ip6_ra_chain *next;
179 struct sock *sk;
180 int sel;
181 void (*destructor)(struct sock *);
182};
183
184extern struct ip6_ra_chain *ip6_ra_chain;
185extern rwlock_t ip6_ra_lock;
186
187/*
188 This structure is prepared by protocol, when parsing
189 ancillary data and passed to IPv6.
190 */
191
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000192struct ipv6_txoptions {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 /* Length of this structure */
194 int tot_len;
195
196 /* length of extension headers */
197
198 __u16 opt_flen; /* after fragment hdr */
199 __u16 opt_nflen; /* before fragment hdr */
200
201 struct ipv6_opt_hdr *hopopt;
202 struct ipv6_opt_hdr *dst0opt;
203 struct ipv6_rt_hdr *srcrt; /* Routing Header */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 struct ipv6_opt_hdr *dst1opt;
205
206 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
207};
208
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000209struct ip6_flowlabel {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 struct ip6_flowlabel *next;
Al Viro90bcaf72006-11-08 00:25:17 -0800211 __be32 label;
Eric Dumazetdb3459d2007-05-03 17:39:04 -0700212 atomic_t users;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 struct in6_addr dst;
214 struct ipv6_txoptions *opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 unsigned long linger;
216 u8 share;
217 u32 owner;
218 unsigned long lastuse;
219 unsigned long expires;
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700220 struct net *fl_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221};
222
Harvey Harrisonf3a7c662009-02-14 22:58:35 -0800223#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
224#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000226struct ipv6_fl_socklist {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 struct ipv6_fl_socklist *next;
228 struct ip6_flowlabel *fl;
229};
230
Al Viro90bcaf72006-11-08 00:25:17 -0800231extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
233 struct ip6_flowlabel * fl,
234 struct ipv6_txoptions * fopt);
235extern void fl6_free_socklist(struct sock *sk);
236extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800237extern int ip6_flowlabel_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238extern void ip6_flowlabel_cleanup(void);
239
240static inline void fl6_sock_release(struct ip6_flowlabel *fl)
241{
242 if (fl)
243 atomic_dec(&fl->users);
244}
245
Denis V. Lunev725a8ff2008-07-19 00:28:58 -0700246extern int ip6_ra_control(struct sock *sk, int sel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Herbert Xue5bbef22007-10-15 12:50:28 -0700248extern int ipv6_parse_hopopts(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
250extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900251extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
252 int newtype,
253 struct ipv6_opt_hdr __user *newopt,
254 int newoptlen);
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900255struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
256 struct ipv6_txoptions *opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Arnaldo Carvalho de Melo399c07d2005-12-13 23:24:28 -0800258extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
259
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -0800260int ip6_frag_nqueues(struct net *net);
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800261int ip6_frag_mem(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Joe Perches9874c412010-02-16 18:40:04 +0000263#define IPV6_FRAG_HIGH_THRESH (256 * 1024) /* 262144 */
264#define IPV6_FRAG_LOW_THRESH (192 * 1024) /* 196608 */
265#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
YOSHIFUJI Hideakib1cacb62005-11-08 09:38:12 -0800267extern int __ipv6_addr_type(const struct in6_addr *addr);
268static inline int ipv6_addr_type(const struct in6_addr *addr)
269{
270 return __ipv6_addr_type(addr) & 0xffff;
271}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273static inline int ipv6_addr_scope(const struct in6_addr *addr)
274{
YOSHIFUJI Hideakib1cacb62005-11-08 09:38:12 -0800275 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
276}
277
278static inline int __ipv6_addr_src_scope(int type)
279{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000280 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
YOSHIFUJI Hideakib1cacb62005-11-08 09:38:12 -0800281}
282
283static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
284{
285 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286}
287
288static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
289{
Eric Dumazetdb3459d2007-05-03 17:39:04 -0700290 return memcmp(a1, a2, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
292
Patrick McHardyf2ffd9e2006-03-20 18:03:16 -0800293static inline int
294ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
295 const struct in6_addr *a2)
296{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000297 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
298 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
299 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
300 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
Patrick McHardyf2ffd9e2006-03-20 18:03:16 -0800301}
302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
304{
Eric Dumazetdb3459d2007-05-03 17:39:04 -0700305 memcpy(a1, a2, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306}
307
308static inline void ipv6_addr_prefix(struct in6_addr *pfx,
309 const struct in6_addr *addr,
310 int plen)
311{
312 /* caller must guarantee 0 <= plen <= 128 */
313 int o = plen >> 3,
314 b = plen & 0x7;
315
Eric Dumazetdb3459d2007-05-03 17:39:04 -0700316 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 memcpy(pfx->s6_addr, addr, o);
Eric Dumazetdb3459d2007-05-03 17:39:04 -0700318 if (b != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320}
321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322static inline void ipv6_addr_set(struct in6_addr *addr,
Al Viro48818f82006-09-27 18:44:54 -0700323 __be32 w1, __be32 w2,
324 __be32 w3, __be32 w4)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325{
326 addr->s6_addr32[0] = w1;
327 addr->s6_addr32[1] = w2;
328 addr->s6_addr32[2] = w3;
329 addr->s6_addr32[3] = w4;
330}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332static inline int ipv6_addr_equal(const struct in6_addr *a1,
333 const struct in6_addr *a2)
334{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000335 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
336 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
337 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
338 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339}
340
Al Viro48818f82006-09-27 18:44:54 -0700341static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 unsigned int prefixlen)
343{
344 unsigned pdw, pbi;
345
346 /* check complete u32 in prefix */
347 pdw = prefixlen >> 5;
348 if (pdw && memcmp(a1, a2, pdw << 2))
349 return 0;
350
351 /* check incomplete u32 in prefix */
352 pbi = prefixlen & 0x1f;
353 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
354 return 0;
355
356 return 1;
357}
358
359static inline int ipv6_prefix_equal(const struct in6_addr *a1,
360 const struct in6_addr *a2,
361 unsigned int prefixlen)
362{
363 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
364 prefixlen);
365}
366
Pavel Emelyanov2588fe12007-10-17 19:44:34 -0700367struct inet_frag_queue;
Pavel Emelyanov2588fe12007-10-17 19:44:34 -0700368
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100369enum ip6_defrag_users {
370 IP6_DEFRAG_LOCAL_DELIVER,
371 IP6_DEFRAG_CONNTRACK_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700372 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100373 IP6_DEFRAG_CONNTRACK_OUT,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700374 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
Patrick McHardy8fa9ff62009-12-15 16:59:59 +0100375 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700376 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100377};
378
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700379struct ip6_create_arg {
380 __be32 id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100381 u32 user;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000382 const struct in6_addr *src;
383 const struct in6_addr *dst;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700384};
385
386void ip6_frag_init(struct inet_frag_queue *q, void *a);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700387int ip6_frag_match(struct inet_frag_queue *q, void *a);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389static inline int ipv6_addr_any(const struct in6_addr *a)
390{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000391 return (a->s6_addr32[0] | a->s6_addr32[1] |
392 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393}
394
YOSHIFUJI Hideakif630e432008-06-19 16:33:57 -0700395static inline int ipv6_addr_loopback(const struct in6_addr *a)
396{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000397 return (a->s6_addr32[0] | a->s6_addr32[1] |
398 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
YOSHIFUJI Hideakif630e432008-06-19 16:33:57 -0700399}
400
Brian Haleye773e4f2007-08-24 23:16:08 -0700401static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
402{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000403 return (a->s6_addr32[0] | a->s6_addr32[1] |
404 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
Brian Haleye773e4f2007-08-24 23:16:08 -0700405}
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407/*
Juha-Matti Tapio99cd07a2008-02-28 20:55:46 -0800408 * Check for a RFC 4843 ORCHID address
409 * (Overlay Routable Cryptographic Hash Identifiers)
410 */
411static inline int ipv6_addr_orchid(const struct in6_addr *a)
412{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000413 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
Juha-Matti Tapio99cd07a2008-02-28 20:55:46 -0800414}
415
Aurélien Charbonf15364b2008-01-18 15:50:56 +0100416static inline void ipv6_addr_set_v4mapped(const __be32 addr,
417 struct in6_addr *v4mapped)
418{
419 ipv6_addr_set(v4mapped,
420 0, 0,
421 htonl(0x0000FFFF),
422 addr);
423}
424
Juha-Matti Tapio99cd07a2008-02-28 20:55:46 -0800425/*
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800426 * find the first different bit between two addresses
427 * length of address must be a multiple of 32bits
428 */
429static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
430{
Al Viroef296f52006-11-14 20:56:33 -0800431 const __be32 *a1 = token1, *a2 = token2;
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800432 int i;
433
434 addrlen >>= 2;
435
436 for (i = 0; i < addrlen; i++) {
Al Viroef296f52006-11-14 20:56:33 -0800437 __be32 xb = a1[i] ^ a2[i];
438 if (xb)
YOSHIFUJI Hideaki / 吉藤英明d57b8fb2010-03-29 06:00:05 +0000439 return i * 32 + 31 - __fls(ntohl(xb));
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800440 }
441
442 /*
443 * we should *never* get to this point since that
444 * would mean the addrs are equal
445 *
446 * However, we do get to it 8) And exacly, when
447 * addresses are equal 8)
448 *
449 * ip route add 1111::/128 via ...
450 * ip route add 1111::/64 via ...
451 * and we are here.
452 *
453 * Ideally, this function should stop comparison
454 * at prefix length. It does not, but it is still OK,
455 * if returned value is greater than prefix length.
456 * --ANK (980803)
457 */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000458 return addrlen << 5;
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800459}
460
461static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
462{
463 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
464}
465
Eric Dumazet87c48fa2011-07-21 21:25:58 -0700466extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
Sridhar Samudrala7ea2f2c2009-07-09 08:10:01 +0000467
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800468/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 * Prototypes exported by ipv6
470 */
471
472/*
473 * rcv function (called from netdevice level)
474 */
475
476extern int ipv6_rcv(struct sk_buff *skb,
477 struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700478 struct packet_type *pt,
479 struct net_device *orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
Patrick McHardyb05e1062006-01-06 23:03:34 -0800481extern int ip6_rcv_finish(struct sk_buff *skb);
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483/*
484 * upper-layer output functions
485 */
486extern int ip6_xmit(struct sock *sk,
487 struct sk_buff *skb,
David S. Miller4c9483b2011-03-12 16:22:43 -0500488 struct flowi6 *fl6,
Shan Wei4e15ed42010-04-15 16:43:08 +0000489 struct ipv6_txoptions *opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491extern int ip6_nd_hdr(struct sock *sk,
492 struct sk_buff *skb,
493 struct net_device *dev,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +0900494 const struct in6_addr *saddr,
495 const struct in6_addr *daddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 int proto, int len);
497
498extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
499
500extern int ip6_append_data(struct sock *sk,
501 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
502 void *from,
503 int length,
504 int transhdrlen,
505 int hlimit,
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900506 int tclass,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 struct ipv6_txoptions *opt,
David S. Miller4c9483b2011-03-12 16:22:43 -0500508 struct flowi6 *fl6,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 struct rt6_info *rt,
Brian Haley13b52cd2010-04-23 11:26:08 +0000510 unsigned int flags,
511 int dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513extern int ip6_push_pending_frames(struct sock *sk);
514
515extern void ip6_flush_pending_frames(struct sock *sk);
516
517extern int ip6_dst_lookup(struct sock *sk,
518 struct dst_entry **dst,
David S. Miller4c9483b2011-03-12 16:22:43 -0500519 struct flowi6 *fl6);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800520extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
David S. Miller4c9483b2011-03-12 16:22:43 -0500521 struct flowi6 *fl6,
David S. Miller68d0c6d2011-03-01 13:19:07 -0800522 const struct in6_addr *final_dst,
David S. Millera1414712011-03-01 14:32:04 -0800523 bool can_sleep);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800524extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
David S. Miller4c9483b2011-03-12 16:22:43 -0500525 struct flowi6 *fl6,
David S. Miller68d0c6d2011-03-01 13:19:07 -0800526 const struct in6_addr *final_dst,
David S. Millera1414712011-03-01 14:32:04 -0800527 bool can_sleep);
David S. Miller2774c132011-03-01 14:59:04 -0800528extern struct dst_entry * ip6_blackhole_route(struct net *net,
529 struct dst_entry *orig_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531/*
532 * skb processing functions
533 */
534
535extern int ip6_output(struct sk_buff *skb);
536extern int ip6_forward(struct sk_buff *skb);
537extern int ip6_input(struct sk_buff *skb);
538extern int ip6_mc_input(struct sk_buff *skb);
539
Herbert Xuef76bc22008-01-11 19:15:08 -0800540extern int __ip6_local_out(struct sk_buff *skb);
541extern int ip6_local_out(struct sk_buff *skb);
542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543/*
544 * Extension header (options) processing
545 */
546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
548 struct ipv6_txoptions *opt,
549 u8 *proto,
550 struct in6_addr **daddr_p);
551extern void ipv6_push_frag_opts(struct sk_buff *skb,
552 struct ipv6_txoptions *opt,
553 u8 *proto);
554
555extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
Herbert Xu0d3d0772005-04-24 20:16:19 -0700556 u8 *nexthdrp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
558extern int ipv6_ext_hdr(u8 nexthdr);
559
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -0700560extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
561
David S. Miller4c9483b2011-03-12 16:22:43 -0500562extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000563 const struct ipv6_txoptions *opt,
564 struct in6_addr *orig);
565
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566/*
567 * socket options (ipv6_sockglue.c)
568 */
569
570extern int ipv6_setsockopt(struct sock *sk, int level,
571 int optname,
572 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -0700573 unsigned int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574extern int ipv6_getsockopt(struct sock *sk, int level,
575 int optname,
576 char __user *optval,
577 int __user *optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800578extern int compat_ipv6_setsockopt(struct sock *sk,
579 int level,
580 int optname,
581 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -0700582 unsigned int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800583extern int compat_ipv6_getsockopt(struct sock *sk,
584 int level,
585 int optname,
586 char __user *optval,
587 int __user *optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589extern int ip6_datagram_connect(struct sock *sk,
590 struct sockaddr *addr, int addr_len);
591
592extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
Brian Haley4b340ae2010-04-23 11:26:09 +0000593extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
Al Viroe69a4adc2006-11-14 20:56:00 -0800594extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 u32 info, u8 *payload);
David S. Miller4c9483b2011-03-12 16:22:43 -0500596extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
597extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
599extern int inet6_release(struct socket *sock);
600extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
601 int addr_len);
602extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
603 int *uaddr_len, int peer);
604extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
605 unsigned long arg);
606
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800607extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
608 struct sock *sk);
609
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610/*
611 * reassembly.c
612 */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800613extern const struct proto_ops inet6_stream_ops;
614extern const struct proto_ops inet6_dgram_ops;
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300615
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200616struct group_source_req;
617struct group_filter;
618
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300619extern int ip6_mc_source(int add, int omode, struct sock *sk,
620 struct group_source_req *pgsr);
621extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
622extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
623 struct group_filter __user *optval,
624 int __user *optlen);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700625extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
626 const struct in6_addr *daddr, u32 rnd);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300627
628#ifdef CONFIG_PROC_FS
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700629extern int ac6_proc_init(struct net *net);
630extern void ac6_proc_exit(struct net *net);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300631extern int raw6_proc_init(void);
632extern void raw6_proc_exit(void);
Daniel Lezcano6f8b13b2008-03-21 04:14:45 -0700633extern int tcp6_proc_init(struct net *net);
634extern void tcp6_proc_exit(struct net *net);
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -0700635extern int udp6_proc_init(struct net *net);
636extern void udp6_proc_exit(struct net *net);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800637extern int udplite6_proc_init(void);
638extern void udplite6_proc_exit(void);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300639extern int ipv6_misc_proc_init(void);
640extern void ipv6_misc_proc_exit(void);
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700641extern int snmp6_register_dev(struct inet6_dev *idev);
642extern int snmp6_unregister_dev(struct inet6_dev *idev);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300643
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700644#else
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700645static inline int ac6_proc_init(struct net *net) { return 0; }
646static inline void ac6_proc_exit(struct net *net) { }
647static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
648static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300649#endif
650
651#ifdef CONFIG_SYSCTL
Daniel Lezcano760f2d02008-01-10 02:53:43 -0800652extern ctl_table ipv6_route_table_template[];
653extern ctl_table ipv6_icmp_table_template[];
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300654
Daniel Lezcano6de1a912008-02-05 02:57:59 -0800655extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
656extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
Daniel Lezcano291480c2008-01-10 02:47:55 -0800657extern int ipv6_sysctl_register(void);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300658extern void ipv6_sysctl_unregister(void);
Al Viroeeb61f72008-07-27 08:59:33 +0100659extern int ipv6_static_sysctl_register(void);
660extern void ipv6_static_sysctl_unregister(void);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300661#endif
662
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663#endif /* _NET_IPV6_H */