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Merge branch 'stable-4.12' of git://git.infradead.org/users/pcmoore/audit
[mirror_ubuntu-artful-kernel.git] / include / net / addrconf.h
CommitLineData
1da177e4
LT		 1#ifndef _ADDRCONF_H
2#define _ADDRCONF_H
3
bd11f074 4#define MAX_RTR_SOLICITATIONS -1 /* unlimited */
1da177e4 5#define RTR_SOLICITATION_INTERVAL (4*HZ)
bd11f074 6#define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */
1da177e4
LT		 7
8#define MIN_VALID_LIFETIME (2*3600) /* 2 hours */
9
10#define TEMP_VALID_LIFETIME (7*86400)
11#define TEMP_PREFERRED_LIFETIME (86400)
76f793e3 12#define REGEN_MAX_RETRY (3)
1da177e4
LT		 13#define MAX_DESYNC_FACTOR (600)
14
15#define ADDR_CHECK_FREQUENCY (120*HZ)
16
17#define IPV6_MAX_ADDRESSES 16
18
5c766d64
JP		 19#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
20#define ADDRCONF_TIMER_FUZZ (HZ / 4)
21#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
22
c7dc89c0 23#include <linux/in.h>
6a800d45
PM		 24#include <linux/in6.h>
25
1da177e4
LT		 26struct prefix_info {
27 __u8 type;
28 __u8 length;
29 __u8 prefix_len;
30
31#if defined(__BIG_ENDIAN_BITFIELD)
32 __u8 onlink : 1,
33 autoconf : 1,
34 reserved : 6;
35#elif defined(__LITTLE_ENDIAN_BITFIELD)
36 __u8 reserved : 6,
37 autoconf : 1,
38 onlink : 1;
39#else
40#error "Please fix <asm/byteorder.h>"
41#endif
e69a4adc
AV		 42 __be32 valid;
43 __be32 prefered;
44 __be32 reserved2;
1da177e4
LT		 45
46 struct in6_addr prefix;
47};
48
49
1da177e4
LT		 50#include <linux/netdevice.h>
51#include <net/if_inet6.h>
e4553edd 52#include <net/ipv6.h>
1da177e4 53
ddbe5032
ED		 54#define IN6_ADDR_HSIZE_SHIFT 4
55#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4 56
e8e54d3c
JP		 57int addrconf_init(void);
58void addrconf_cleanup(void);
1da177e4 59
e8e54d3c
JP		 60int addrconf_add_ifaddr(struct net *net, void __user *arg);
61int addrconf_del_ifaddr(struct net *net, void __user *arg);
62int addrconf_set_dstaddr(struct net *net, void __user *arg);
1da177e4 63
e8e54d3c
JP		 64int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
65 const struct net_device *dev, int strict);
c58da4c6
EK		 66int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
67 const struct net_device *dev, int strict,
68 u32 banned_flags);
bfeade08 69
59fbb3a6 70#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
e8e54d3c 71int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
65d4ed92 72#endif
52eeeb84 73
7df37ff3
CB		 74bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
75 const unsigned int prefix_len,
76 struct net_device *dev);
77
e8e54d3c
JP		 78int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
79
80struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
81 const struct in6_addr *addr,
82 struct net_device *dev, int strict);
83
84int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
85 const struct in6_addr *daddr, unsigned int srcprefs,
86 struct in6_addr *saddr);
87int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 88 u32 banned_flags);
e8e54d3c 89int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 90 u32 banned_flags);
fe38d2a1 91int inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
e32ea7e7 92 bool match_wildcard);
e8e54d3c
JP		 93void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
94void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
1da177e4 95
2ad3ed59
AA		 96void addrconf_add_linklocal(struct inet6_dev *idev,
97 const struct in6_addr *addr, u32 flags);
98
cc84b3c6
AA		 99int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
100 const struct prefix_info *pinfo,
101 struct inet6_dev *in6_dev,
102 const struct in6_addr *addr, int addr_type,
103 u32 addr_flags, bool sllao, bool tokenized,
104 __u32 valid_lft, u32 prefered_lft);
105
399e6f95
MB		 106static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
107{
108 if (dev->addr_len != ETH_ALEN)
109 return -1;
110 memcpy(eui, dev->dev_addr, 3);
111 memcpy(eui + 5, dev->dev_addr + 3, 3);
112
113 /*
114 * The zSeries OSA network cards can be shared among various
115 * OS instances, but the OSA cards have only one MAC address.
116 * This leads to duplicate address conflicts in conjunction
117 * with IPv6 if more than one instance uses the same card.
118 *
119 * The driver for these cards can deliver a unique 16-bit
120 * identifier for each instance sharing the same card. It is
121 * placed instead of 0xFFFE in the interface identifier. The
122 * "u" bit of the interface identifier is not inverted in this
123 * case. Hence the resulting interface identifier has local
124 * scope according to RFC2373.
125 */
126 if (dev->dev_id) {
127 eui[3] = (dev->dev_id >> 8) & 0xFF;
128 eui[4] = dev->dev_id & 0xFF;
129 } else {
130 eui[3] = 0xFF;
131 eui[4] = 0xFE;
132 eui[0] ^= 2;
133 }
134 return 0;
135}
136
4bed72e4 137static inline unsigned long addrconf_timeout_fixup(u32 timeout,
95c96174 138 unsigned int unit)
4bed72e4
YH		 139{
140 if (timeout == 0xffffffff)
141 return ~0UL;
142
143 /*
144 * Avoid arithmetic overflow.
145 * Assuming unit is constant and non-zero, this "if" statement
146 * will go away on 64bit archs.
147 */
148 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
149 return LONG_MAX / unit;
150
151 return timeout;
152}
153
154static inline int addrconf_finite_timeout(unsigned long timeout)
155{
156 return ~timeout;
157}
158
2a8cc6c8
YH		 159/*
160 * IPv6 Address Label subsystem (addrlabel.c)
161 */
e8e54d3c
JP		 162int ipv6_addr_label_init(void);
163void ipv6_addr_label_cleanup(void);
164void ipv6_addr_label_rtnl_register(void);
165u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
166 int type, int ifindex);
2a8cc6c8 167
1da177e4
LT		 168/*
169 * multicast prototypes (mcast.c)
170 */
e8e54d3c
JP		 171int ipv6_sock_mc_join(struct sock *sk, int ifindex,
172 const struct in6_addr *addr);
173int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
174 const struct in6_addr *addr);
8651be8f 175void __ipv6_sock_mc_close(struct sock *sk);
e8e54d3c
JP		 176void ipv6_sock_mc_close(struct sock *sk);
177bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
178 const struct in6_addr *src_addr);
179
180int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
181int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
182int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
183void ipv6_mc_up(struct inet6_dev *idev);
184void ipv6_mc_down(struct inet6_dev *idev);
185void ipv6_mc_unmap(struct inet6_dev *idev);
186void ipv6_mc_remap(struct inet6_dev *idev);
187void ipv6_mc_init_dev(struct inet6_dev *idev);
188void ipv6_mc_destroy_dev(struct inet6_dev *idev);
9afd85c9 189int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
e8e54d3c
JP		 190void addrconf_dad_failure(struct inet6_ifaddr *ifp);
191
192bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
193 const struct in6_addr *src_addr);
194
195void ipv6_mc_dad_complete(struct inet6_dev *idev);
5f81bd2e
CW		 196
197/* A stub used by vxlan module. This is ugly, ideally these
198 * symbols should be built into the core kernel.
199 */
200struct ipv6_stub {
201 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
202 const struct in6_addr *addr);
203 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
204 const struct in6_addr *addr);
343d60aa
RP		 205 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
206 struct dst_entry **dst, struct flowi6 *fl6);
5f81bd2e 207 void (*udpv6_encap_enable)(void);
38cf595b 208 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
f564f45c
CW		 209 const struct in6_addr *solicited_addr,
210 bool router, bool solicited, bool override, bool inc_opt);
e15a00aa 211 struct neigh_table *nd_tbl;
5f81bd2e
CW		 212};
213extern const struct ipv6_stub *ipv6_stub __read_mostly;
214
daad1512
YH		 215/*
216 * identify MLD packets for MLD filter exceptions
217 */
218static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
219{
220 struct icmp6hdr *hdr;
221
222 if (nexthdr != IPPROTO_ICMPV6 ||
223 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
224 return false;
225
226 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
227
228 switch (hdr->icmp6_type) {
229 case ICMPV6_MGM_QUERY:
230 case ICMPV6_MGM_REPORT:
231 case ICMPV6_MGM_REDUCTION:
232 case ICMPV6_MLD2_REPORT:
233 return true;
234 default:
235 break;
236 }
237 return false;
238}
1da177e4 239
e8e54d3c
JP		 240void addrconf_prefix_rcv(struct net_device *dev,
241 u8 *opt, int len, bool sllao);
1da177e4 242
1da177e4
LT		 243/*
244 * anycast prototypes (anycast.c)
245 */
e8e54d3c
JP		 246int ipv6_sock_ac_join(struct sock *sk, int ifindex,
247 const struct in6_addr *addr);
248int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
249 const struct in6_addr *addr);
250void ipv6_sock_ac_close(struct sock *sk);
251
013b4d90 252int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
e8e54d3c 253int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
381f4dca 254void ipv6_ac_destroy_dev(struct inet6_dev *idev);
e8e54d3c 255bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
7c90cc2d
FLB		 256 const struct in6_addr *addr);
257bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
258 const struct in6_addr *addr);
1da177e4
LT		 259
260/* Device notifier */
e8e54d3c
JP		 261int register_inet6addr_notifier(struct notifier_block *nb);
262int unregister_inet6addr_notifier(struct notifier_block *nb);
263int inet6addr_notifier_call_chain(unsigned long val, void *v);
1da177e4 264
85b3daad
DA		 265void inet6_netconf_notify_devconf(struct net *net, int event, int type,
266 int ifindex, struct ipv6_devconf *devconf);
d67b8c61 267
48daa3bb
ED		 268/**
269 * __in6_dev_get - get inet6_dev pointer from netdevice
270 * @dev: network device
271 *
272 * Caller must hold rcu_read_lock or RTNL, because this function
273 * does not take a reference on the inet6_dev.
274 */
275static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
1da177e4 276{
48daa3bb 277 return rcu_dereference_rtnl(dev->ip6_ptr);
1da177e4
LT		 278}
279
48daa3bb
ED		 280/**
281 * in6_dev_get - get inet6_dev pointer from netdevice
282 * @dev: network device
283 *
284 * This version can be used in any context, and takes a reference
285 * on the inet6_dev. Callers must use in6_dev_put() later to
286 * release this reference.
287 */
288static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
1da177e4 289{
48daa3bb
ED		 290 struct inet6_dev *idev;
291
8814c4b5 292 rcu_read_lock();
48daa3bb 293 idev = rcu_dereference(dev->ip6_ptr);
1da177e4
LT		 294 if (idev)
295 atomic_inc(&idev->refcnt);
8814c4b5 296 rcu_read_unlock();
1da177e4
LT		 297 return idev;
298}
299
bba24896
JP		 300static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
301{
302 struct inet6_dev *idev = __in6_dev_get(dev);
303
304 return idev ? idev->nd_parms : NULL;
305}
306
e8e54d3c 307void in6_dev_finish_destroy(struct inet6_dev *idev);
1da177e4 308
48daa3bb 309static inline void in6_dev_put(struct inet6_dev *idev)
1da177e4
LT		 310{
311 if (atomic_dec_and_test(&idev->refcnt))
312 in6_dev_finish_destroy(idev);
313}
314
48daa3bb
ED		 315static inline void __in6_dev_put(struct inet6_dev *idev)
316{
317 atomic_dec(&idev->refcnt);
318}
1da177e4 319
48daa3bb
ED		 320static inline void in6_dev_hold(struct inet6_dev *idev)
321{
322 atomic_inc(&idev->refcnt);
323}
1da177e4 324
e8e54d3c 325void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
1da177e4
LT		 326
327static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
328{
329 if (atomic_dec_and_test(&ifp->refcnt))
330 inet6_ifa_finish_destroy(ifp);
331}
332
48daa3bb
ED		 333static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
334{
335 atomic_dec(&ifp->refcnt);
336}
1da177e4 337
48daa3bb
ED		 338static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
339{
340 atomic_inc(&ifp->refcnt);
341}
1da177e4 342
1da177e4
LT		 343
344/*
345 * compute link-local solicited-node multicast address
346 */
347
348static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
349 struct in6_addr *solicited)
350{
351 ipv6_addr_set(solicited,
0e7b8dcd
YH		 352 htonl(0xFF020000), 0,
353 htonl(0x1),
354 htonl(0xFF000000) | addr->s6_addr32[3]);
1da177e4
LT		 355}
356
b27b28cb 357static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
1da177e4 358{
d1641565 359#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959 360 __be64 *p = (__be64 *)addr;
d1641565
YH		 361 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
362#else
48daa3bb 363 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
fed85383 364 addr->s6_addr32[1] | addr->s6_addr32[2] |
48daa3bb 365 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
d1641565 366#endif
1da177e4
LT		 367}
368
b27b28cb 369static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
1da177e4 370{
d1641565 371#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959 372 __be64 *p = (__be64 *)addr;
d1641565
YH		 373 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
374#else
48daa3bb 375 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
fed85383 376 addr->s6_addr32[1] | addr->s6_addr32[2] |
48daa3bb 377 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
d1641565 378#endif
1da177e4
LT		 379}
380
b27b28cb 381static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
c7dc89c0 382{
48daa3bb 383 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
c7dc89c0
FT		 384}
385
ca97a644
YH		 386static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
387{
9d100774 388#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959 389 __be64 *p = (__be64 *)addr;
9d100774
YH		 390 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
391 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
392 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
393#else
394 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
395 addr->s6_addr32[1] |
396 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
397 (addr->s6_addr[12] ^ 0xff)) == 0;
398#endif
ca97a644
YH		 399}
400
20380731 401#ifdef CONFIG_PROC_FS
e8e54d3c
JP		 402int if6_proc_init(void);
403void if6_proc_exit(void);
20380731
ACM		 404#endif
405
1da177e4 406#endif
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