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Documentation: add networking/netdev-FAQ.txt
[deliverable/linux.git] / include / net / addrconf.h
CommitLineData
1da177e4
LT		 1#ifndef _ADDRCONF_H
2#define _ADDRCONF_H
3
1da177e4
LT		 4#define MAX_RTR_SOLICITATIONS 3
5#define RTR_SOLICITATION_INTERVAL (4*HZ)
6
7#define MIN_VALID_LIFETIME (2*3600) /* 2 hours */
8
9#define TEMP_VALID_LIFETIME (7*86400)
10#define TEMP_PREFERRED_LIFETIME (86400)
76f793e3 11#define REGEN_MAX_RETRY (3)
1da177e4
LT		 12#define MAX_DESYNC_FACTOR (600)
13
14#define ADDR_CHECK_FREQUENCY (120*HZ)
15
16#define IPV6_MAX_ADDRESSES 16
17
5c766d64
JP		 18#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
19#define ADDRCONF_TIMER_FUZZ (HZ / 4)
20#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
21
c7dc89c0 22#include <linux/in.h>
6a800d45
PM		 23#include <linux/in6.h>
24
1da177e4
LT		 25struct prefix_info {
26 __u8 type;
27 __u8 length;
28 __u8 prefix_len;
29
30#if defined(__BIG_ENDIAN_BITFIELD)
31 __u8 onlink : 1,
32 autoconf : 1,
33 reserved : 6;
34#elif defined(__LITTLE_ENDIAN_BITFIELD)
35 __u8 reserved : 6,
36 autoconf : 1,
37 onlink : 1;
38#else
39#error "Please fix <asm/byteorder.h>"
40#endif
e69a4adc
AV		 41 __be32 valid;
42 __be32 prefered;
43 __be32 reserved2;
1da177e4
LT		 44
45 struct in6_addr prefix;
46};
47
48
1da177e4
LT		 49#include <linux/netdevice.h>
50#include <net/if_inet6.h>
e4553edd 51#include <net/ipv6.h>
1da177e4 52
ddbe5032
ED		 53#define IN6_ADDR_HSIZE_SHIFT 4
54#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4
LT		 55
56extern int addrconf_init(void);
57extern void addrconf_cleanup(void);
58
af284937
DL		 59extern int addrconf_add_ifaddr(struct net *net,
60 void __user *arg);
61extern int addrconf_del_ifaddr(struct net *net,
62 void __user *arg);
63extern int addrconf_set_dstaddr(struct net *net,
64 void __user *arg);
1da177e4 65
bfeade08 66extern int ipv6_chk_addr(struct net *net,
b71d1d42 67 const struct in6_addr *addr,
2a7851bf 68 const struct net_device *dev,
1da177e4 69 int strict);
bfeade08 70
59fbb3a6 71#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
389f6612 72extern int ipv6_chk_home_addr(struct net *net,
b71d1d42 73 const struct in6_addr *addr);
65d4ed92 74#endif
52eeeb84 75
b71d1d42 76extern int ipv6_chk_prefix(const struct in6_addr *addr,
52eeeb84
YH		 77 struct net_device *dev);
78
1cab3da6 79extern struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
9acd9f3a 80 const struct in6_addr *addr,
1cab3da6
DL		 81 struct net_device *dev,
82 int strict);
83
191cd582 84extern int ipv6_dev_get_saddr(struct net *net,
b3f644fc 85 const struct net_device *dev,
9acd9f3a 86 const struct in6_addr *daddr,
7cbca67c 87 unsigned int srcprefs,
1da177e4 88 struct in6_addr *saddr);
8965779d
AW		 89extern int __ipv6_get_lladdr(struct inet6_dev *idev,
90 struct in6_addr *addr,
91 unsigned char banned_flags);
95c385b4
NH		 92extern int ipv6_get_lladdr(struct net_device *dev,
93 struct in6_addr *addr,
94 unsigned char banned_flags);
b2f5e7cd
VY		 95extern int ipv6_rcv_saddr_equal(const struct sock *sk,
96 const struct sock *sk2);
1da177e4 97extern void addrconf_join_solict(struct net_device *dev,
b71d1d42 98 const struct in6_addr *addr);
1da177e4 99extern void addrconf_leave_solict(struct inet6_dev *idev,
b71d1d42 100 const struct in6_addr *addr);
1da177e4 101
4bed72e4 102static inline unsigned long addrconf_timeout_fixup(u32 timeout,
95c96174 103 unsigned int unit)
4bed72e4
YH		 104{
105 if (timeout == 0xffffffff)
106 return ~0UL;
107
108 /*
109 * Avoid arithmetic overflow.
110 * Assuming unit is constant and non-zero, this "if" statement
111 * will go away on 64bit archs.
112 */
113 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
114 return LONG_MAX / unit;
115
116 return timeout;
117}
118
119static inline int addrconf_finite_timeout(unsigned long timeout)
120{
121 return ~timeout;
122}
123
2a8cc6c8
YH		 124/*
125 * IPv6 Address Label subsystem (addrlabel.c)
126 */
127extern int ipv6_addr_label_init(void);
2cc6d2bf 128extern void ipv6_addr_label_cleanup(void);
2a8cc6c8 129extern void ipv6_addr_label_rtnl_register(void);
3de23255
BT		 130extern u32 ipv6_addr_label(struct net *net,
131 const struct in6_addr *addr,
2a8cc6c8
YH		 132 int type, int ifindex);
133
1da177e4
LT		 134/*
135 * multicast prototypes (mcast.c)
136 */
9acd9f3a
YH		 137extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
138 const struct in6_addr *addr);
139extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
140 const struct in6_addr *addr);
1da177e4 141extern void ipv6_sock_mc_close(struct sock *sk);
a50feda5
ED		 142extern bool inet6_mc_check(struct sock *sk,
143 const struct in6_addr *mc_addr,
144 const struct in6_addr *src_addr);
1da177e4 145
9acd9f3a
YH		 146extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
147extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
148extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
1da177e4
LT		 149extern void ipv6_mc_up(struct inet6_dev *idev);
150extern void ipv6_mc_down(struct inet6_dev *idev);
75c78500
MS		 151extern void ipv6_mc_unmap(struct inet6_dev *idev);
152extern void ipv6_mc_remap(struct inet6_dev *idev);
1da177e4
LT		 153extern void ipv6_mc_init_dev(struct inet6_dev *idev);
154extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
155extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
156
a50feda5
ED		 157extern bool ipv6_chk_mcast_addr(struct net_device *dev,
158 const struct in6_addr *group,
159 const struct in6_addr *src_addr);
daad1512 160
b173ee48 161extern void ipv6_mc_dad_complete(struct inet6_dev *idev);
daad1512
YH		 162/*
163 * identify MLD packets for MLD filter exceptions
164 */
165static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
166{
167 struct icmp6hdr *hdr;
168
169 if (nexthdr != IPPROTO_ICMPV6 ||
170 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
171 return false;
172
173 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
174
175 switch (hdr->icmp6_type) {
176 case ICMPV6_MGM_QUERY:
177 case ICMPV6_MGM_REPORT:
178 case ICMPV6_MGM_REDUCTION:
179 case ICMPV6_MLD2_REPORT:
180 return true;
181 default:
182 break;
183 }
184 return false;
185}
1da177e4 186
e6bff995
NH		 187extern void addrconf_prefix_rcv(struct net_device *dev,
188 u8 *opt, int len, bool sllao);
1da177e4 189
1da177e4
LT		 190/*
191 * anycast prototypes (anycast.c)
192 */
b71d1d42
ED		 193extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
194extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);
1da177e4 195extern void ipv6_sock_ac_close(struct sock *sk);
1da177e4 196
b71d1d42
ED		 197extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
198extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
a50feda5
ED		 199extern bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
200 const struct in6_addr *addr);
1da177e4
LT		 201
202
203/* Device notifier */
204extern int register_inet6addr_notifier(struct notifier_block *nb);
205extern int unregister_inet6addr_notifier(struct notifier_block *nb);
f88c91dd 206extern int inet6addr_notifier_call_chain(unsigned long val, void *v);
1da177e4 207
d67b8c61
ND		 208extern void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
209 struct ipv6_devconf *devconf);
210
48daa3bb
ED		 211/**
212 * __in6_dev_get - get inet6_dev pointer from netdevice
213 * @dev: network device
214 *
215 * Caller must hold rcu_read_lock or RTNL, because this function
216 * does not take a reference on the inet6_dev.
217 */
218static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
1da177e4 219{
48daa3bb 220 return rcu_dereference_rtnl(dev->ip6_ptr);
1da177e4
LT		 221}
222
48daa3bb
ED		 223/**
224 * in6_dev_get - get inet6_dev pointer from netdevice
225 * @dev: network device
226 *
227 * This version can be used in any context, and takes a reference
228 * on the inet6_dev. Callers must use in6_dev_put() later to
229 * release this reference.
230 */
231static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
1da177e4 232{
48daa3bb
ED		 233 struct inet6_dev *idev;
234
8814c4b5 235 rcu_read_lock();
48daa3bb 236 idev = rcu_dereference(dev->ip6_ptr);
1da177e4
LT		 237 if (idev)
238 atomic_inc(&idev->refcnt);
8814c4b5 239 rcu_read_unlock();
1da177e4
LT		 240 return idev;
241}
242
243extern void in6_dev_finish_destroy(struct inet6_dev *idev);
244
48daa3bb 245static inline void in6_dev_put(struct inet6_dev *idev)
1da177e4
LT		 246{
247 if (atomic_dec_and_test(&idev->refcnt))
248 in6_dev_finish_destroy(idev);
249}
250
48daa3bb
ED		 251static inline void __in6_dev_put(struct inet6_dev *idev)
252{
253 atomic_dec(&idev->refcnt);
254}
1da177e4 255
48daa3bb
ED		 256static inline void in6_dev_hold(struct inet6_dev *idev)
257{
258 atomic_inc(&idev->refcnt);
259}
1da177e4
LT		 260
261extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
262
263static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
264{
265 if (atomic_dec_and_test(&ifp->refcnt))
266 inet6_ifa_finish_destroy(ifp);
267}
268
48daa3bb
ED		 269static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
270{
271 atomic_dec(&ifp->refcnt);
272}
1da177e4 273
48daa3bb
ED		 274static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
275{
276 atomic_inc(&ifp->refcnt);
277}
1da177e4 278
1da177e4
LT		 279
280/*
281 * compute link-local solicited-node multicast address
282 */
283
284static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
285 struct in6_addr *solicited)
286{
287 ipv6_addr_set(solicited,
0e7b8dcd
YH		 288 htonl(0xFF020000), 0,
289 htonl(0x1),
290 htonl(0xFF000000) | addr->s6_addr32[3]);
1da177e4
LT		 291}
292
b27b28cb 293static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
1da177e4 294{
0e7b8dcd 295 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
1da177e4
LT		 296}
297
b27b28cb 298static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
1da177e4 299{
d1641565
YH		 300#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
301 __u64 *p = (__u64 *)addr;
302 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
303#else
48daa3bb 304 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
fed85383 305 addr->s6_addr32[1] | addr->s6_addr32[2] |
48daa3bb 306 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
d1641565 307#endif
1da177e4
LT		 308}
309
b27b28cb 310static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
1da177e4 311{
d1641565
YH		 312#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
313 __u64 *p = (__u64 *)addr;
314 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
315#else
48daa3bb 316 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
fed85383 317 addr->s6_addr32[1] | addr->s6_addr32[2] |
48daa3bb 318 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
d1641565 319#endif
1da177e4
LT		 320}
321
b27b28cb 322static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
c7dc89c0 323{
48daa3bb 324 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
c7dc89c0
FT		 325}
326
ca97a644
YH		 327static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
328{
9d100774
YH		 329#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
330 __u64 *p = (__u64 *)addr;
331 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
332 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
333 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
334#else
335 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
336 addr->s6_addr32[1] |
337 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
338 (addr->s6_addr[12] ^ 0xff)) == 0;
339#endif
ca97a644
YH		 340}
341
20380731
ACM		 342#ifdef CONFIG_PROC_FS
343extern int if6_proc_init(void);
344extern void if6_proc_exit(void);
345#endif
346
1da177e4 347#endif
Linux kernel - Deliverables
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