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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>
Eric Dumazet08dcdbf2013-02-21 12:18:52 +000018#include <linux/jhash.h>
Herbert Xu20283d82007-07-30 17:05:49 -070019#include <net/if_inet6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <net/ndisc.h>
21#include <net/flow.h>
Jiri Pirko1bd758e2015-05-12 14:56:07 +020022#include <net/flow_dissector.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <net/snmp.h>
24
25#define SIN6_LEN_RFC2133 24
26
27#define IPV6_MAXPLEN 65535
28
29/*
30 * NextHeader field of IPv6 header
31 */
32
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. */
xeb@mail.ruc12b3952012-08-10 00:51:50 +000039#define NEXTHDR_GRE 47 /* GRE header. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#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. */
Joe Stringer280c5712013-07-23 13:37:45 +090045#define NEXTHDR_SCTP 132 /* SCTP message. */
Masahide NAKAMURA2b741652006-08-23 20:34:26 -070046#define NEXTHDR_MOBILITY 135 /* Mobility header. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#define NEXTHDR_MAX 255
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#define IPV6_DEFAULT_HOPLIMIT 64
51#define IPV6_DEFAULT_MCASTHOPS 1
52
53/*
54 * Addr type
55 *
56 * type - unicast | multicast
57 * scope - local | site | global
58 * v4 - compat
59 * v4mapped
60 * any
61 * loopback
62 */
63
64#define IPV6_ADDR_ANY 0x0000U
65
66#define IPV6_ADDR_UNICAST 0x0001U
67#define IPV6_ADDR_MULTICAST 0x0002U
68
69#define IPV6_ADDR_LOOPBACK 0x0010U
70#define IPV6_ADDR_LINKLOCAL 0x0020U
71#define IPV6_ADDR_SITELOCAL 0x0040U
72
73#define IPV6_ADDR_COMPATv4 0x0080U
74
75#define IPV6_ADDR_SCOPE_MASK 0x00f0U
76
77#define IPV6_ADDR_MAPPED 0x1000U
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79/*
80 * Addr scopes
81 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84#define __IPV6_ADDR_SCOPE_INVALID -1
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
86#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
87#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
88#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
89#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
90
91/*
Linus Lüssing5ced1332011-02-15 13:19:20 +000092 * Addr flags
93 */
Linus Lüssing5ced1332011-02-15 13:19:20 +000094#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
95 ((a)->s6_addr[1] & 0x10)
96#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
97 ((a)->s6_addr[1] & 0x20)
98#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
99 ((a)->s6_addr[1] & 0x40)
Linus Lüssing5ced1332011-02-15 13:19:20 +0000100
101/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 * fragmentation header
103 */
104
105struct frag_hdr {
Al Viro44473a62006-11-08 00:21:46 -0800106 __u8 nexthdr;
107 __u8 reserved;
108 __be16 frag_off;
109 __be32 identification;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110};
111
Paul Durrant1431fb32013-12-03 17:39:29 +0000112#define IP6_MF 0x0001
113#define IP6_OFFSET 0xFFF8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Lorenzo Colittie1108612014-05-13 10:17:33 -0700115#define IP6_REPLY_MARK(net, mark) \
116 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118#include <net/sock.h>
119
120/* sysctls */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121extern int sysctl_mld_max_msf;
Hannes Frederic Sowa2f711932014-09-02 15:49:25 +0200122extern int sysctl_mld_qrv;
Pavel Emelyanov3d7cc2b2008-01-09 00:33:11 -0800123
Denis V. Lunev087fe242008-10-08 10:35:11 -0700124#define _DEVINC(net, statname, modifier, idev, field) \
David L Stevens14878f72007-09-16 16:52:35 -0700125({ \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
Denis V. Lunev9261e532008-10-08 10:36:03 -0700129 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
David L Stevens14878f72007-09-16 16:52:35 -0700130})
131
Eric Dumazetbe281e52011-05-19 01:14:23 +0000132/* per device counters are atomic_long_t */
133#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
134({ \
135 struct inet6_dev *_idev = (idev); \
136 if (likely(_idev != NULL)) \
137 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
138 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
139})
140
Eric Dumazet2a244442011-11-13 01:24:04 +0000141/* per device and per net counters are atomic_long_t */
142#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
143({ \
144 struct inet6_dev *_idev = (idev); \
145 if (likely(_idev != NULL)) \
146 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
147 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
148})
149
Denis V. Lunev087fe242008-10-08 10:35:11 -0700150#define _DEVADD(net, statname, modifier, idev, field, val) \
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700151({ \
152 struct inet6_dev *_idev = (idev); \
153 if (likely(_idev != NULL)) \
154 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
Denis V. Lunev9261e532008-10-08 10:36:03 -0700155 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700156})
157
Neil Hormanedf391f2009-04-27 02:45:02 -0700158#define _DEVUPD(net, statname, modifier, idev, field, val) \
159({ \
160 struct inet6_dev *_idev = (idev); \
161 if (likely(_idev != NULL)) \
162 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
163 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
164})
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166/* MIBs */
David L Stevens14878f72007-09-16 16:52:35 -0700167
Denis V. Lunev087fe242008-10-08 10:35:11 -0700168#define IP6_INC_STATS(net, idev,field) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700169 _DEVINC(net, ipv6, 64, idev, field)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700170#define IP6_INC_STATS_BH(net, idev,field) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700171 _DEVINC(net, ipv6, 64_BH, idev, field)
Neil Hormanedf391f2009-04-27 02:45:02 -0700172#define IP6_ADD_STATS(net, idev,field,val) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700173 _DEVADD(net, ipv6, 64, idev, field, val)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700174#define IP6_ADD_STATS_BH(net, idev,field,val) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700175 _DEVADD(net, ipv6, 64_BH, idev, field, val)
Neil Hormanedf391f2009-04-27 02:45:02 -0700176#define IP6_UPD_PO_STATS(net, idev,field,val) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700177 _DEVUPD(net, ipv6, 64, idev, field, val)
Neil Hormanedf391f2009-04-27 02:45:02 -0700178#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700179 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700180#define ICMP6_INC_STATS(net, idev, field) \
Eric Dumazetbe281e52011-05-19 01:14:23 +0000181 _DEVINCATOMIC(net, icmpv6, , idev, field)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700182#define ICMP6_INC_STATS_BH(net, idev, field) \
Eric Dumazetbe281e52011-05-19 01:14:23 +0000183 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
David L Stevens14878f72007-09-16 16:52:35 -0700184
Denis V. Lunev087fe242008-10-08 10:35:11 -0700185#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
Eric Dumazet2a244442011-11-13 01:24:04 +0000186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700187#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
Eric Dumazet2a244442011-11-13 01:24:04 +0000188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
Denis V. Lunev087fe242008-10-08 10:35:11 -0700189#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
Eric Dumazet2a244442011-11-13 01:24:04 +0000190 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
David L Stevens14878f72007-09-16 16:52:35 -0700191
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000192struct ip6_ra_chain {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 struct ip6_ra_chain *next;
194 struct sock *sk;
195 int sel;
196 void (*destructor)(struct sock *);
197};
198
199extern struct ip6_ra_chain *ip6_ra_chain;
200extern rwlock_t ip6_ra_lock;
201
202/*
203 This structure is prepared by protocol, when parsing
204 ancillary data and passed to IPv6.
205 */
206
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000207struct ipv6_txoptions {
Eric Dumazet45f6fad2015-11-29 19:37:57 -0800208 atomic_t refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 /* Length of this structure */
210 int tot_len;
211
212 /* length of extension headers */
213
214 __u16 opt_flen; /* after fragment hdr */
215 __u16 opt_nflen; /* before fragment hdr */
216
217 struct ipv6_opt_hdr *hopopt;
218 struct ipv6_opt_hdr *dst0opt;
219 struct ipv6_rt_hdr *srcrt; /* Routing Header */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 struct ipv6_opt_hdr *dst1opt;
Eric Dumazet45f6fad2015-11-29 19:37:57 -0800221 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
223};
224
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000225struct ip6_flowlabel {
Eric Dumazet7f0e44a2013-03-07 04:20:32 +0000226 struct ip6_flowlabel __rcu *next;
Al Viro90bcaf72006-11-08 00:25:17 -0800227 __be32 label;
Eric Dumazetdb3459d2007-05-03 17:39:04 -0700228 atomic_t users;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 struct in6_addr dst;
230 struct ipv6_txoptions *opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 unsigned long linger;
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000232 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 u8 share;
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600234 union {
235 struct pid *pid;
236 kuid_t uid;
237 } owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 unsigned long lastuse;
239 unsigned long expires;
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700240 struct net *fl_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241};
242
Tom Herbert82a584b2015-04-29 15:33:21 -0700243#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
244#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
245#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
246
Florent Fourcot37cfee92013-12-08 15:46:58 +0100247#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
Li RongQingd76ed222014-01-15 17:03:30 +0800248#define IPV6_TCLASS_SHIFT 20
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000250struct ipv6_fl_socklist {
Eric Dumazet7f0e44a2013-03-07 04:20:32 +0000251 struct ipv6_fl_socklist __rcu *next;
252 struct ip6_flowlabel *fl;
253 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254};
255
Eric Dumazet45f6fad2015-11-29 19:37:57 -0800256static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
257{
258 struct ipv6_txoptions *opt;
259
260 rcu_read_lock();
261 opt = rcu_dereference(np->opt);
262 if (opt && !atomic_inc_not_zero(&opt->refcnt))
263 opt = NULL;
264 rcu_read_unlock();
265 return opt;
266}
267
268static inline void txopt_put(struct ipv6_txoptions *opt)
269{
270 if (opt && atomic_dec_and_test(&opt->refcnt))
271 kfree_rcu(opt, rcu);
272}
273
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700274struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
275struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
276 struct ip6_flowlabel *fl,
277 struct ipv6_txoptions *fopt);
278void fl6_free_socklist(struct sock *sk);
279int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
Florent Fourcot46e5f402014-01-17 17:15:04 +0100280int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
281 int flags);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700282int ip6_flowlabel_init(void);
283void ip6_flowlabel_cleanup(void);
Ben Hutchingsc5371a32018-01-22 20:06:42 +0000284bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286static inline void fl6_sock_release(struct ip6_flowlabel *fl)
287{
288 if (fl)
289 atomic_dec(&fl->users);
290}
291
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700292void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
David S. Millerb94f1c02012-07-12 00:33:37 -0700293
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000294int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
295 struct icmp6hdr *thdr, int len);
296
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700297int ip6_ra_control(struct sock *sk, int sel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700299int ipv6_parse_hopopts(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700301struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
302 struct ipv6_txoptions *opt);
303struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
304 struct ipv6_txoptions *opt,
305 int newtype,
306 struct ipv6_opt_hdr __user *newopt,
307 int newoptlen);
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900308struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
309 struct ipv6_txoptions *opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Eric Dumazeta2247722014-09-27 09:50:56 -0700311bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
312 const struct inet6_skb_parm *opt);
Arnaldo Carvalho de Melo399c07d2005-12-13 23:24:28 -0800313
Shmulik Ladkaniaeaf6e92012-11-30 10:25:59 +0000314static inline bool ipv6_accept_ra(struct inet6_dev *idev)
315{
316 /* If forwarding is enabled, RA are not accepted unless the special
317 * hybrid mode (accept_ra=2) is enabled.
318 */
319 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
320 idev->cnf.accept_ra;
321}
322
Jesper Dangaard Brouerc2a93662013-01-15 07:16:35 +0000323#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
324#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
Joe Perches9874c412010-02-16 18:40:04 +0000325#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700327int __ipv6_addr_type(const struct in6_addr *addr);
YOSHIFUJI Hideakib1cacb62005-11-08 09:38:12 -0800328static inline int ipv6_addr_type(const struct in6_addr *addr)
329{
330 return __ipv6_addr_type(addr) & 0xffff;
331}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333static inline int ipv6_addr_scope(const struct in6_addr *addr)
334{
YOSHIFUJI Hideakib1cacb62005-11-08 09:38:12 -0800335 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
336}
337
338static inline int __ipv6_addr_src_scope(int type)
339{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000340 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
YOSHIFUJI Hideakib1cacb62005-11-08 09:38:12 -0800341}
342
343static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
344{
345 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346}
347
Hannes Frederic Sowab7ef2132013-03-08 02:07:16 +0000348static inline bool __ipv6_addr_needs_scope_id(int type)
349{
350 return type & IPV6_ADDR_LINKLOCAL ||
351 (type & IPV6_ADDR_MULTICAST &&
352 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
353}
354
355static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
356{
357 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
358}
359
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
361{
Eric Dumazetdb3459d2007-05-03 17:39:04 -0700362 return memcmp(a1, a2, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
364
Eric Dumazet1a203cb2012-07-10 19:05:57 +0000365static inline bool
Patrick McHardyf2ffd9e2006-03-20 18:03:16 -0800366ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
367 const struct in6_addr *a2)
368{
Eric Dumazet1a203cb2012-07-10 19:05:57 +0000369#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
370 const unsigned long *ul1 = (const unsigned long *)a1;
371 const unsigned long *ulm = (const unsigned long *)m;
372 const unsigned long *ul2 = (const unsigned long *)a2;
373
374 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
375 ((ul1[1] ^ ul2[1]) & ulm[1]));
376#else
Eric Dumazeta02cec22010-09-22 20:43:57 +0000377 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
378 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
379 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
380 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
Eric Dumazet1a203cb2012-07-10 19:05:57 +0000381#endif
Patrick McHardyf2ffd9e2006-03-20 18:03:16 -0800382}
383
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384static inline void ipv6_addr_prefix(struct in6_addr *pfx,
385 const struct in6_addr *addr,
386 int plen)
387{
388 /* caller must guarantee 0 <= plen <= 128 */
389 int o = plen >> 3,
390 b = plen & 0x7;
391
Eric Dumazetdb3459d2007-05-03 17:39:04 -0700392 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 memcpy(pfx->s6_addr, addr, o);
Eric Dumazetdb3459d2007-05-03 17:39:04 -0700394 if (b != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396}
397
YOSHIFUJI Hideaki / 吉藤英明5206c572013-01-14 07:10:24 +0000398static inline void __ipv6_addr_set_half(__be32 *addr,
399 __be32 wh, __be32 wl)
400{
401#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
402#if defined(__BIG_ENDIAN)
403 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
404 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
405 return;
406 }
407#elif defined(__LITTLE_ENDIAN)
408 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
409 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
410 return;
411 }
412#endif
413#endif
414 addr[0] = wh;
415 addr[1] = wl;
416}
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418static inline void ipv6_addr_set(struct in6_addr *addr,
Al Viro48818f82006-09-27 18:44:54 -0700419 __be32 w1, __be32 w2,
420 __be32 w3, __be32 w4)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
YOSHIFUJI Hideaki / 吉藤英明5206c572013-01-14 07:10:24 +0000422 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
423 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Eric Dumazet92113bf2012-05-18 08:14:11 +0200426static inline bool ipv6_addr_equal(const struct in6_addr *a1,
427 const struct in6_addr *a2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428{
Eric Dumazet1a203cb2012-07-10 19:05:57 +0000429#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
430 const unsigned long *ul1 = (const unsigned long *)a1;
431 const unsigned long *ul2 = (const unsigned long *)a2;
432
433 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
434#else
Eric Dumazeta02cec22010-09-22 20:43:57 +0000435 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
436 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
437 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
438 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
Eric Dumazet1a203cb2012-07-10 19:05:57 +0000439#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
441
YOSHIFUJI Hideaki / 吉藤英明38675172013-01-14 07:10:38 +0000442#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
443static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
444 const __be64 *a2,
445 unsigned int len)
446{
Fabio Baltieri512613d2013-01-16 22:30:17 +0100447 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
YOSHIFUJI Hideaki / 吉藤英明38675172013-01-14 07:10:38 +0000448 return false;
449 return true;
450}
451
452static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
453 const struct in6_addr *addr2,
454 unsigned int prefixlen)
455{
456 const __be64 *a1 = (const __be64 *)addr1;
457 const __be64 *a2 = (const __be64 *)addr2;
458
459 if (prefixlen >= 64) {
460 if (a1[0] ^ a2[0])
461 return false;
462 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
463 }
464 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
465}
466#else
YOSHIFUJI Hideaki / 吉藤英明2ef97332013-01-14 07:10:31 +0000467static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
468 const struct in6_addr *addr2,
469 unsigned int prefixlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
YOSHIFUJI Hideaki / 吉藤英明2ef97332013-01-14 07:10:31 +0000471 const __be32 *a1 = addr1->s6_addr32;
472 const __be32 *a2 = addr2->s6_addr32;
Eric Dumazet95c96172012-04-15 05:58:06 +0000473 unsigned int pdw, pbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 /* check complete u32 in prefix */
476 pdw = prefixlen >> 5;
477 if (pdw && memcmp(a1, a2, pdw << 2))
Eric Dumazet92113bf2012-05-18 08:14:11 +0200478 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480 /* check incomplete u32 in prefix */
481 pbi = prefixlen & 0x1f;
482 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
Eric Dumazet92113bf2012-05-18 08:14:11 +0200483 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Eric Dumazet92113bf2012-05-18 08:14:11 +0200485 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486}
YOSHIFUJI Hideaki / 吉藤英明38675172013-01-14 07:10:38 +0000487#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
Pavel Emelyanov2588fe12007-10-17 19:44:34 -0700489struct inet_frag_queue;
Pavel Emelyanov2588fe12007-10-17 19:44:34 -0700490
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100491enum ip6_defrag_users {
492 IP6_DEFRAG_LOCAL_DELIVER,
493 IP6_DEFRAG_CONNTRACK_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700494 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100495 IP6_DEFRAG_CONNTRACK_OUT,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700496 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
Patrick McHardy8fa9ff62009-12-15 16:59:59 +0100497 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700498 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100499};
500
Florian Westphal36c77782014-07-24 16:50:29 +0200501void ip6_frag_init(struct inet_frag_queue *q, const void *a);
Eric Dumazet49310712018-10-10 12:29:56 -0700502extern const struct rhashtable_params ip6_rhash_params;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700503
Amerigo Wangb836c992012-09-18 16:50:09 +0000504/*
505 * Equivalent of ipv4 struct ip
506 */
507struct frag_queue {
508 struct inet_frag_queue q;
509
Amerigo Wangb836c992012-09-18 16:50:09 +0000510 int iif;
511 unsigned int csum;
512 __u16 nhoffset;
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000513 u8 ecn;
Amerigo Wangb836c992012-09-18 16:50:09 +0000514};
515
Eric Dumazet9c6727d2018-10-10 12:29:50 -0700516void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq);
Amerigo Wangb836c992012-09-18 16:50:09 +0000517
Eric Dumazet92113bf2012-05-18 08:14:11 +0200518static inline bool ipv6_addr_any(const struct in6_addr *a)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Eric Dumazet1a203cb2012-07-10 19:05:57 +0000520#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
521 const unsigned long *ul = (const unsigned long *)a;
522
523 return (ul[0] | ul[1]) == 0UL;
524#else
Eric Dumazeta02cec22010-09-22 20:43:57 +0000525 return (a->s6_addr32[0] | a->s6_addr32[1] |
526 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
Eric Dumazet1a203cb2012-07-10 19:05:57 +0000527#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528}
529
Eric Dumazetddbe5032012-07-18 08:11:12 +0000530static inline u32 ipv6_addr_hash(const struct in6_addr *a)
531{
532#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
533 const unsigned long *ul = (const unsigned long *)a;
534 unsigned long x = ul[0] ^ ul[1];
535
536 return (u32)(x ^ (x >> 32));
537#else
538 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
539 a->s6_addr32[2] ^ a->s6_addr32[3]);
540#endif
541}
542
Eric Dumazet08dcdbf2013-02-21 12:18:52 +0000543/* more secured version of ipv6_addr_hash() */
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200544static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
Eric Dumazet08dcdbf2013-02-21 12:18:52 +0000545{
546 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
547
548 return jhash_3words(v,
549 (__force u32)a->s6_addr32[2],
550 (__force u32)a->s6_addr32[3],
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200551 initval);
Eric Dumazet08dcdbf2013-02-21 12:18:52 +0000552}
553
Eric Dumazet92113bf2012-05-18 08:14:11 +0200554static inline bool ipv6_addr_loopback(const struct in6_addr *a)
YOSHIFUJI Hideakif630e432008-06-19 16:33:57 -0700555{
YOSHIFUJI Hideaki / 吉藤英明e2876562013-01-14 07:10:06 +0000556#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
Jeff Layton1373a772014-07-16 06:55:46 -0400557 const __be64 *be = (const __be64 *)a;
YOSHIFUJI Hideaki / 吉藤英明e2876562013-01-14 07:10:06 +0000558
Jeff Layton1373a772014-07-16 06:55:46 -0400559 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
YOSHIFUJI Hideaki / 吉藤英明e2876562013-01-14 07:10:06 +0000560#else
Eric Dumazeta02cec22010-09-22 20:43:57 +0000561 return (a->s6_addr32[0] | a->s6_addr32[1] |
Jeff Layton1373a772014-07-16 06:55:46 -0400562 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
YOSHIFUJI Hideaki / 吉藤英明e2876562013-01-14 07:10:06 +0000563#endif
YOSHIFUJI Hideakif630e432008-06-19 16:33:57 -0700564}
565
Jeff Layton1373a772014-07-16 06:55:46 -0400566/*
567 * Note that we must __force cast these to unsigned long to make sparse happy,
568 * since all of the endian-annotated types are fixed size regardless of arch.
569 */
Eric Dumazet92113bf2012-05-18 08:14:11 +0200570static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
Brian Haleye773e4f2007-08-24 23:16:08 -0700571{
YOSHIFUJI Hideaki / 吉藤英明a04d40b2013-01-14 07:10:14 +0000572 return (
573#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
Jeff Layton1373a772014-07-16 06:55:46 -0400574 *(unsigned long *)a |
YOSHIFUJI Hideaki / 吉藤英明a04d40b2013-01-14 07:10:14 +0000575#else
Jeff Layton1373a772014-07-16 06:55:46 -0400576 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
YOSHIFUJI Hideaki / 吉藤英明a04d40b2013-01-14 07:10:14 +0000577#endif
Jeff Layton1373a772014-07-16 06:55:46 -0400578 (__force unsigned long)(a->s6_addr32[2] ^
579 cpu_to_be32(0x0000ffff))) == 0UL;
Brian Haleye773e4f2007-08-24 23:16:08 -0700580}
581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582/*
Juha-Matti Tapio99cd07a2008-02-28 20:55:46 -0800583 * Check for a RFC 4843 ORCHID address
584 * (Overlay Routable Cryptographic Hash Identifiers)
585 */
Eric Dumazet92113bf2012-05-18 08:14:11 +0200586static inline bool ipv6_addr_orchid(const struct in6_addr *a)
Juha-Matti Tapio99cd07a2008-02-28 20:55:46 -0800587{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000588 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
Juha-Matti Tapio99cd07a2008-02-28 20:55:46 -0800589}
590
Lorenzo Colitti5c986312014-04-29 11:57:34 +0900591static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
592{
593 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
594}
595
Aurélien Charbonf15364b2008-01-18 15:50:56 +0100596static inline void ipv6_addr_set_v4mapped(const __be32 addr,
597 struct in6_addr *v4mapped)
598{
599 ipv6_addr_set(v4mapped,
600 0, 0,
601 htonl(0x0000FFFF),
602 addr);
603}
604
Juha-Matti Tapio99cd07a2008-02-28 20:55:46 -0800605/*
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800606 * find the first different bit between two addresses
607 * length of address must be a multiple of 32bits
608 */
YOSHIFUJI Hideaki / 吉藤英明9f2e7332013-01-14 07:09:54 +0000609static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800610{
Al Viroef296f52006-11-14 20:56:33 -0800611 const __be32 *a1 = token1, *a2 = token2;
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800612 int i;
613
614 addrlen >>= 2;
615
616 for (i = 0; i < addrlen; i++) {
Al Viroef296f52006-11-14 20:56:33 -0800617 __be32 xb = a1[i] ^ a2[i];
618 if (xb)
YOSHIFUJI Hideaki / 吉藤英明d57b8fb2010-03-29 06:00:05 +0000619 return i * 32 + 31 - __fls(ntohl(xb));
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800620 }
621
622 /*
623 * we should *never* get to this point since that
624 * would mean the addrs are equal
625 *
626 * However, we do get to it 8) And exacly, when
627 * addresses are equal 8)
628 *
629 * ip route add 1111::/128 via ...
630 * ip route add 1111::/64 via ...
631 * and we are here.
632 *
633 * Ideally, this function should stop comparison
634 * at prefix length. It does not, but it is still OK,
635 * if returned value is greater than prefix length.
636 * --ANK (980803)
637 */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000638 return addrlen << 5;
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800639}
640
YOSHIFUJI Hideaki / 吉藤英明9f2e7332013-01-14 07:09:54 +0000641#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
642static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
643{
644 const __be64 *a1 = token1, *a2 = token2;
645 int i;
646
647 addrlen >>= 3;
648
649 for (i = 0; i < addrlen; i++) {
650 __be64 xb = a1[i] ^ a2[i];
651 if (xb)
652 return i * 64 + 63 - __fls(be64_to_cpu(xb));
653 }
654
655 return addrlen << 6;
656}
657#endif
658
659static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
660{
661#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
662 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
663 return __ipv6_addr_diff64(token1, token2, addrlen);
664#endif
665 return __ipv6_addr_diff32(token1, token2, addrlen);
666}
667
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800668static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
669{
670 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
671}
672
Eric Dumazet7f159862015-05-25 16:02:21 -0700673__be32 ipv6_select_ident(struct net *net,
674 const struct in6_addr *daddr,
675 const struct in6_addr *saddr);
Hannes Frederic Sowa5a352dd2015-03-25 17:07:45 +0100676void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
Ben Hutchings5188cd42014-10-30 18:27:17 +0000677
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700678int ip6_dst_hoplimit(struct dst_entry *dst);
Cong Wang3ce9b352013-08-31 13:44:28 +0800679
Lorenzo Colitti5c986312014-04-29 11:57:34 +0900680static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
681 struct dst_entry *dst)
682{
683 int hlimit;
684
685 if (ipv6_addr_is_multicast(&fl6->daddr))
686 hlimit = np->mcast_hops;
687 else
688 hlimit = np->hop_limit;
689 if (hlimit < 0)
690 hlimit = ip6_dst_hoplimit(dst);
691 return hlimit;
692}
693
Tom Herbertc3f83242015-06-04 09:16:40 -0700694/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
695 * Equivalent to : flow->v6addrs.src = iph->saddr;
696 * flow->v6addrs.dst = iph->daddr;
697 */
698static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
699 const struct ipv6hdr *iph)
700{
701 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
702 offsetof(typeof(flow->addrs), v6addrs.src) +
703 sizeof(flow->addrs.v6addrs.src));
704 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
705 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
706}
707
Florian Fainellia37934f2014-07-08 11:15:03 -0700708#if IS_ENABLED(CONFIG_IPV6)
Tom Herbert42240902015-07-31 16:52:12 -0700709
710/* Sysctl settings for net ipv6.auto_flowlabels */
711#define IP6_AUTO_FLOW_LABEL_OFF 0
712#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
713#define IP6_AUTO_FLOW_LABEL_OPTIN 2
714#define IP6_AUTO_FLOW_LABEL_FORCED 3
715
716#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
717
Tom Herbertb5677412015-07-31 16:52:14 -0700718#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
Tom Herbert42240902015-07-31 16:52:12 -0700719
Tom Herbertcb1ce2e2014-07-01 21:33:10 -0700720static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
Tom Herbert67800f92015-07-31 16:52:11 -0700721 __be32 flowlabel, bool autolabel,
722 struct flowi6 *fl6)
Tom Herbertcb1ce2e2014-07-01 21:33:10 -0700723{
Tom Herbert42240902015-07-31 16:52:12 -0700724 u32 hash;
Tom Herbertcb1ce2e2014-07-01 21:33:10 -0700725
Dimitris Michailidis1507ea62017-05-23 21:54:07 -0400726 /* @flowlabel may include more than a flow label, eg, the traffic class.
727 * Here we want only the flow label value.
728 */
729 flowlabel &= IPV6_FLOWLABEL_MASK;
730
Tom Herbert42240902015-07-31 16:52:12 -0700731 if (flowlabel ||
732 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
733 (!autolabel &&
734 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
735 return flowlabel;
Tom Herbertcb1ce2e2014-07-01 21:33:10 -0700736
Tom Herbert42240902015-07-31 16:52:12 -0700737 hash = skb_get_hash_flowi6(skb, fl6);
Tom Herbertcb1ce2e2014-07-01 21:33:10 -0700738
Tom Herbert42240902015-07-31 16:52:12 -0700739 /* Since this is being sent on the wire obfuscate hash a bit
740 * to minimize possbility that any useful information to an
741 * attacker is leaked. Only lower 20 bits are relevant.
742 */
Colin Ian King2be77972018-07-17 17:12:39 +0100743 hash = rol32(hash, 16);
Tom Herbert82a584b2015-04-29 15:33:21 -0700744
Tom Herbert42240902015-07-31 16:52:12 -0700745 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
746
747 if (net->ipv6.sysctl.flowlabel_state_ranges)
748 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
Tom Herbertcb1ce2e2014-07-01 21:33:10 -0700749
750 return flowlabel;
751}
Tom Herbert42240902015-07-31 16:52:12 -0700752
753static inline int ip6_default_np_autolabel(struct net *net)
754{
755 switch (net->ipv6.sysctl.auto_flowlabels) {
756 case IP6_AUTO_FLOW_LABEL_OFF:
757 case IP6_AUTO_FLOW_LABEL_OPTIN:
758 default:
759 return 0;
760 case IP6_AUTO_FLOW_LABEL_OPTOUT:
761 case IP6_AUTO_FLOW_LABEL_FORCED:
762 return 1;
763 }
764}
Florian Fainellia37934f2014-07-08 11:15:03 -0700765#else
766static inline void ip6_set_txhash(struct sock *sk) { }
767static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
Tom Herbert42240902015-07-31 16:52:12 -0700768 __be32 flowlabel, bool autolabel,
769 struct flowi6 *fl6)
Florian Fainellia37934f2014-07-08 11:15:03 -0700770{
771 return flowlabel;
772}
Tom Herbert42240902015-07-31 16:52:12 -0700773static inline int ip6_default_np_autolabel(struct net *net)
774{
775 return 0;
776}
Florian Fainellia37934f2014-07-08 11:15:03 -0700777#endif
778
Tom Herbertcb1ce2e2014-07-01 21:33:10 -0700779
YOSHIFUJI Hideaki971f3592005-11-08 09:37:56 -0800780/*
YOSHIFUJI Hideaki / 吉藤英明3e4e4c12013-01-13 05:01:39 +0000781 * Header manipulation
782 */
783static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
784 __be32 flowlabel)
785{
YOSHIFUJI Hideaki07f623d2013-01-17 12:10:57 +0900786 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
YOSHIFUJI Hideaki / 吉藤英明3e4e4c12013-01-13 05:01:39 +0000787}
788
YOSHIFUJI Hideaki / 吉藤英明6502ca52013-01-13 05:01:51 +0000789static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
790{
791 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
792}
793
Florent Fourcot3308de22013-12-08 15:47:00 +0100794static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
795{
796 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
797}
798
Li RongQingd76ed222014-01-15 17:03:30 +0800799static inline u8 ip6_tclass(__be32 flowinfo)
800{
801 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
802}
YOSHIFUJI Hideaki / 吉藤英明3e4e4c12013-01-13 05:01:39 +0000803/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 * Prototypes exported by ipv6
805 */
806
807/*
808 * rcv function (called from netdevice level)
809 */
810
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700811int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
812 struct packet_type *pt, struct net_device *orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
Eric W. Biederman0c4b51f2015-09-15 20:04:18 -0500814int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
Patrick McHardyb05e1062006-01-06 23:03:34 -0800815
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816/*
817 * upper-layer output functions
818 */
Eric Dumazet1c1e9d22015-09-25 07:39:20 -0700819int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700820 struct ipv6_txoptions *opt, int tclass);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700822int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700824int ip6_append_data(struct sock *sk,
825 int getfrag(void *from, char *to, int offset, int len,
826 int odd, struct sk_buff *skb),
827 void *from, int length, int transhdrlen, int hlimit,
828 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
829 struct rt6_info *rt, unsigned int flags, int dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700831int ip6_push_pending_frames(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700833void ip6_flush_pending_frames(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
Vlad Yasevich64223982015-01-31 10:40:15 -0500835int ip6_send_skb(struct sk_buff *skb);
836
837struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
838 struct inet_cork_full *cork,
839 struct inet6_cork *v6_cork);
840struct sk_buff *ip6_make_skb(struct sock *sk,
841 int getfrag(void *from, char *to, int offset,
842 int len, int odd, struct sk_buff *skb),
843 void *from, int length, int transhdrlen,
844 int hlimit, int tclass, struct ipv6_txoptions *opt,
845 struct flowi6 *fl6, struct rt6_info *rt,
846 unsigned int flags, int dontfrag);
847
848static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
849{
850 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
851 &inet6_sk(sk)->cork);
852}
853
Roopa Prabhu343d60a2015-07-30 13:34:53 -0700854int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
855 struct flowi6 *fl6);
Eric Dumazet3aef9342015-09-25 07:39:12 -0700856struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200857 const struct in6_addr *final_dst);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700858struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200859 const struct in6_addr *final_dst);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700860struct dst_entry *ip6_blackhole_route(struct net *net,
861 struct dst_entry *orig_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
863/*
864 * skb processing functions
865 */
866
Eric W. Biedermanede20592015-10-07 16:48:47 -0500867int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700868int ip6_forward(struct sk_buff *skb);
869int ip6_input(struct sk_buff *skb);
870int ip6_mc_input(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Eric W. Biedermancf91a992015-10-07 16:48:45 -0500872int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
Eric W. Biederman33224b12015-10-07 16:48:46 -0500873int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
Herbert Xuef76bc22008-01-11 19:15:08 -0800874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875/*
876 * Extension header (options) processing
877 */
878
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700879void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
880 u8 *proto, struct in6_addr **daddr_p);
881void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
882 u8 *proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700884int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
885 __be16 *frag_offp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700887bool ipv6_ext_hdr(u8 nexthdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
Jesse Grossf8f62672012-11-09 17:05:07 -0800889enum {
Ansis Atteka9195bb82012-11-09 17:11:31 -0800890 IP6_FH_F_FRAG = (1 << 0),
891 IP6_FH_F_AUTH = (1 << 1),
892 IP6_FH_F_SKIP_RH = (1 << 2),
Jesse Grossf8f62672012-11-09 17:05:07 -0800893};
894
895/* find specified header and get offset to it */
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700896int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
897 unsigned short *fragoff, int *fragflg);
Jesse Grossf8f62672012-11-09 17:05:07 -0800898
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700899int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -0700900
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700901struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
902 const struct ipv6_txoptions *opt,
903 struct in6_addr *orig);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000904
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905/*
906 * socket options (ipv6_sockglue.c)
907 */
908
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700909int ipv6_setsockopt(struct sock *sk, int level, int optname,
910 char __user *optval, unsigned int optlen);
911int ipv6_getsockopt(struct sock *sk, int level, int optname,
912 char __user *optval, int __user *optlen);
913int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
914 char __user *optval, unsigned int optlen);
915int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
916 char __user *optval, int __user *optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700918int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
Hannes Frederic Sowa82b276c2014-01-20 05:16:39 +0100919int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
920 int addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100922int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
923 int *addr_len);
924int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
925 int *addr_len);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700926void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
927 u32 info, u8 *payload);
928void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
929void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700931int inet6_release(struct socket *sock);
932int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
933int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
934 int peer);
935int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700937int inet6_hash_connect(struct inet_timewait_death_row *death_row,
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800938 struct sock *sk);
939
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940/*
941 * reassembly.c
942 */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800943extern const struct proto_ops inet6_stream_ops;
944extern const struct proto_ops inet6_dgram_ops;
Eric Dumazet45202cd2017-06-03 09:29:25 -0700945extern const struct proto_ops inet6_sockraw_ops;
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300946
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200947struct group_source_req;
948struct group_filter;
949
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700950int ip6_mc_source(int add, int omode, struct sock *sk,
951 struct group_source_req *pgsr);
952int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
953int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
954 struct group_filter __user *optval, int __user *optlen);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300955
956#ifdef CONFIG_PROC_FS
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700957int ac6_proc_init(struct net *net);
958void ac6_proc_exit(struct net *net);
959int raw6_proc_init(void);
960void raw6_proc_exit(void);
961int tcp6_proc_init(struct net *net);
962void tcp6_proc_exit(struct net *net);
963int udp6_proc_init(struct net *net);
964void udp6_proc_exit(struct net *net);
965int udplite6_proc_init(void);
966void udplite6_proc_exit(void);
967int ipv6_misc_proc_init(void);
968void ipv6_misc_proc_exit(void);
969int snmp6_register_dev(struct inet6_dev *idev);
970int snmp6_unregister_dev(struct inet6_dev *idev);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300971
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700972#else
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700973static inline int ac6_proc_init(struct net *net) { return 0; }
974static inline void ac6_proc_exit(struct net *net) { }
975static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
976static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300977#endif
978
979#ifdef CONFIG_SYSCTL
Joe Perches9e8cda32013-06-13 19:37:53 -0700980extern struct ctl_table ipv6_route_table_template[];
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300981
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700982struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
983struct ctl_table *ipv6_route_sysctl_init(struct net *net);
984int ipv6_sysctl_register(void);
985void ipv6_sysctl_unregister(void);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300986#endif
987
Madhu Challa46a4dee2015-02-25 09:58:34 -0800988int ipv6_sock_mc_join(struct sock *sk, int ifindex,
989 const struct in6_addr *addr);
Madhu Challa46a4dee2015-02-25 09:58:34 -0800990int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
991 const struct in6_addr *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992#endif /* _NET_IPV6_H */