1#ifndef _ADDRCONF_H
2#define _ADDRCONF_H
3
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)
11#define REGEN_MAX_RETRY			(3)
12#define MAX_DESYNC_FACTOR		(600)
13
14#define ADDR_CHECK_FREQUENCY		(120*HZ)
15
16#define IPV6_MAX_ADDRESSES		16
17
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
22#include <linux/in.h>
23#include <linux/in6.h>
24
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
41	__be32			valid;
42	__be32			prefered;
43	__be32			reserved2;
44
45	struct in6_addr		prefix;
46};
47
48
49#include <linux/netdevice.h>
50#include <net/if_inet6.h>
51#include <net/ipv6.h>
52
53#define IN6_ADDR_HSIZE_SHIFT	4
54#define IN6_ADDR_HSIZE		(1 << IN6_ADDR_HSIZE_SHIFT)
55
56int addrconf_init(void);
57void addrconf_cleanup(void);
58
59int addrconf_add_ifaddr(struct net *net, void __user *arg);
60int addrconf_del_ifaddr(struct net *net, void __user *arg);
61int addrconf_set_dstaddr(struct net *net, void __user *arg);
62
63int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
64		  const struct net_device *dev, int strict);
65int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
66			    const struct net_device *dev, int strict,
67			    u32 banned_flags);
68
69#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
70int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
71#endif
72
73bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
74				   const unsigned int prefix_len,
75				   struct net_device *dev);
76
77int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
78
79struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
80				     const struct in6_addr *addr,
81				     struct net_device *dev, int strict);
82
83int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
84		       const struct in6_addr *daddr, unsigned int srcprefs,
85		       struct in6_addr *saddr);
86int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
87		      u32 banned_flags);
88int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
89		    u32 banned_flags);
90int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2);
91void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
92void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
93
94static inline unsigned long addrconf_timeout_fixup(u32 timeout,
95						   unsigned int unit)
96{
97	if (timeout == 0xffffffff)
98		return ~0UL;
99
100	/*
101	 * Avoid arithmetic overflow.
102	 * Assuming unit is constant and non-zero, this "if" statement
103	 * will go away on 64bit archs.
104	 */
105	if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
106		return LONG_MAX / unit;
107
108	return timeout;
109}
110
111static inline int addrconf_finite_timeout(unsigned long timeout)
112{
113	return ~timeout;
114}
115
116/*
117 *	IPv6 Address Label subsystem (addrlabel.c)
118 */
119int ipv6_addr_label_init(void);
120void ipv6_addr_label_cleanup(void);
121void ipv6_addr_label_rtnl_register(void);
122u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
123		    int type, int ifindex);
124
125/*
126 *	multicast prototypes (mcast.c)
127 */
128int ipv6_sock_mc_join(struct sock *sk, int ifindex,
129		      const struct in6_addr *addr);
130int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
131		      const struct in6_addr *addr);
132void ipv6_sock_mc_close(struct sock *sk);
133bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
134		    const struct in6_addr *src_addr);
135
136int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
137int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
138int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
139void ipv6_mc_up(struct inet6_dev *idev);
140void ipv6_mc_down(struct inet6_dev *idev);
141void ipv6_mc_unmap(struct inet6_dev *idev);
142void ipv6_mc_remap(struct inet6_dev *idev);
143void ipv6_mc_init_dev(struct inet6_dev *idev);
144void ipv6_mc_destroy_dev(struct inet6_dev *idev);
145void addrconf_dad_failure(struct inet6_ifaddr *ifp);
146
147bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
148			 const struct in6_addr *src_addr);
149
150void ipv6_mc_dad_complete(struct inet6_dev *idev);
151
152/* A stub used by vxlan module. This is ugly, ideally these
153 * symbols should be built into the core kernel.
154 */
155struct ipv6_stub {
156	int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
157				 const struct in6_addr *addr);
158	int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
159				 const struct in6_addr *addr);
160	int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst,
161				struct flowi6 *fl6);
162	void (*udpv6_encap_enable)(void);
163	void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
164			      const struct in6_addr *daddr,
165			      const struct in6_addr *solicited_addr,
166			      bool router, bool solicited, bool override, bool inc_opt);
167	struct neigh_table *nd_tbl;
168};
169extern const struct ipv6_stub *ipv6_stub __read_mostly;
170
171/*
172 * identify MLD packets for MLD filter exceptions
173 */
174static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
175{
176	struct icmp6hdr *hdr;
177
178	if (nexthdr != IPPROTO_ICMPV6 ||
179	    !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
180		return false;
181
182	hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
183
184	switch (hdr->icmp6_type) {
185	case ICMPV6_MGM_QUERY:
186	case ICMPV6_MGM_REPORT:
187	case ICMPV6_MGM_REDUCTION:
188	case ICMPV6_MLD2_REPORT:
189		return true;
190	default:
191		break;
192	}
193	return false;
194}
195
196void addrconf_prefix_rcv(struct net_device *dev,
197			 u8 *opt, int len, bool sllao);
198
199u32 addrconf_rt_table(const struct net_device *dev, u32 default_table);
200
201/*
202 *	anycast prototypes (anycast.c)
203 */
204int ipv6_sock_ac_join(struct sock *sk, int ifindex,
205		      const struct in6_addr *addr);
206int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
207		      const struct in6_addr *addr);
208void ipv6_sock_ac_close(struct sock *sk);
209
210int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
211int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
212void ipv6_ac_destroy_dev(struct inet6_dev *idev);
213bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
214			 const struct in6_addr *addr);
215bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
216			     const struct in6_addr *addr);
217
218/* Device notifier */
219int register_inet6addr_notifier(struct notifier_block *nb);
220int unregister_inet6addr_notifier(struct notifier_block *nb);
221int inet6addr_notifier_call_chain(unsigned long val, void *v);
222
223void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
224				  struct ipv6_devconf *devconf);
225
226/**
227 * __in6_dev_get - get inet6_dev pointer from netdevice
228 * @dev: network device
229 *
230 * Caller must hold rcu_read_lock or RTNL, because this function
231 * does not take a reference on the inet6_dev.
232 */
233static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
234{
235	return rcu_dereference_rtnl(dev->ip6_ptr);
236}
237
238/**
239 * in6_dev_get - get inet6_dev pointer from netdevice
240 * @dev: network device
241 *
242 * This version can be used in any context, and takes a reference
243 * on the inet6_dev. Callers must use in6_dev_put() later to
244 * release this reference.
245 */
246static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
247{
248	struct inet6_dev *idev;
249
250	rcu_read_lock();
251	idev = rcu_dereference(dev->ip6_ptr);
252	if (idev)
253		atomic_inc(&idev->refcnt);
254	rcu_read_unlock();
255	return idev;
256}
257
258static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
259{
260	struct inet6_dev *idev = __in6_dev_get(dev);
261
262	return idev ? idev->nd_parms : NULL;
263}
264
265void in6_dev_finish_destroy(struct inet6_dev *idev);
266
267static inline void in6_dev_put(struct inet6_dev *idev)
268{
269	if (atomic_dec_and_test(&idev->refcnt))
270		in6_dev_finish_destroy(idev);
271}
272
273static inline void __in6_dev_put(struct inet6_dev *idev)
274{
275	atomic_dec(&idev->refcnt);
276}
277
278static inline void in6_dev_hold(struct inet6_dev *idev)
279{
280	atomic_inc(&idev->refcnt);
281}
282
283void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
284
285static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
286{
287	if (atomic_dec_and_test(&ifp->refcnt))
288		inet6_ifa_finish_destroy(ifp);
289}
290
291static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
292{
293	atomic_dec(&ifp->refcnt);
294}
295
296static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
297{
298	atomic_inc(&ifp->refcnt);
299}
300
301
302/*
303 *	compute link-local solicited-node multicast address
304 */
305
306static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
307					     struct in6_addr *solicited)
308{
309	ipv6_addr_set(solicited,
310		      htonl(0xFF020000), 0,
311		      htonl(0x1),
312		      htonl(0xFF000000) | addr->s6_addr32[3]);
313}
314
315static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
316{
317#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
318	__be64 *p = (__be64 *)addr;
319	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
320#else
321	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
322		addr->s6_addr32[1] | addr->s6_addr32[2] |
323		(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
324#endif
325}
326
327static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
328{
329#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
330	__be64 *p = (__be64 *)addr;
331	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
332#else
333	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
334		addr->s6_addr32[1] | addr->s6_addr32[2] |
335		(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
336#endif
337}
338
339static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
340{
341	return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
342}
343
344static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
345{
346#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
347	__be64 *p = (__be64 *)addr;
348	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
349		((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
350		 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
351#else
352	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
353		addr->s6_addr32[1] |
354		(addr->s6_addr32[2] ^ htonl(0x00000001)) |
355		(addr->s6_addr[12] ^ 0xff)) == 0;
356#endif
357}
358
359#ifdef CONFIG_PROC_FS
360int if6_proc_init(void);
361void if6_proc_exit(void);
362#endif
363
364#endif
365