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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ADDRCONF_H
3#define _ADDRCONF_H
4
5#define MAX_RTR_SOLICITATIONS -1 /* unlimited */
6#define RTR_SOLICITATION_INTERVAL (4*HZ)
7#define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */
8
9#define MIN_VALID_LIFETIME (2*3600) /* 2 hours */
10
11#define TEMP_VALID_LIFETIME (7*86400)
12#define TEMP_PREFERRED_LIFETIME (86400)
13#define REGEN_MAX_RETRY (3)
14#define MAX_DESYNC_FACTOR (600)
15
16#define ADDR_CHECK_FREQUENCY (120*HZ)
17
18#define IPV6_MAX_ADDRESSES 16
19
20#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
21#define ADDRCONF_TIMER_FUZZ (HZ / 4)
22#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
23
24#define ADDRCONF_NOTIFY_PRIORITY 0
25
26#include <linux/in.h>
27#include <linux/in6.h>
28
29struct prefix_info {
30 __u8 type;
31 __u8 length;
32 __u8 prefix_len;
33
34#if defined(__BIG_ENDIAN_BITFIELD)
35 __u8 onlink : 1,
36 autoconf : 1,
37 reserved : 6;
38#elif defined(__LITTLE_ENDIAN_BITFIELD)
39 __u8 reserved : 6,
40 autoconf : 1,
41 onlink : 1;
42#else
43#error "Please fix <asm/byteorder.h>"
44#endif
45 __be32 valid;
46 __be32 prefered;
47 __be32 reserved2;
48
49 struct in6_addr prefix;
50};
51
52#include <linux/ipv6.h>
53#include <linux/netdevice.h>
54#include <net/if_inet6.h>
55#include <net/ipv6.h>
56
57struct in6_validator_info {
58 struct in6_addr i6vi_addr;
59 struct inet6_dev *i6vi_dev;
60 struct netlink_ext_ack *extack;
61};
62
63struct ifa6_config {
64 const struct in6_addr *pfx;
65 unsigned int plen;
66
67 const struct in6_addr *peer_pfx;
68
69 u32 rt_priority;
70 u32 ifa_flags;
71 u32 preferred_lft;
72 u32 valid_lft;
73 u16 scope;
74};
75
76int addrconf_init(void);
77void addrconf_cleanup(void);
78
79int addrconf_add_ifaddr(struct net *net, void __user *arg);
80int addrconf_del_ifaddr(struct net *net, void __user *arg);
81int addrconf_set_dstaddr(struct net *net, void __user *arg);
82
83int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
84 const struct net_device *dev, int strict);
85int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
86 const struct net_device *dev, bool skip_dev_check,
87 int strict, u32 banned_flags);
88
89#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
90int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
91#endif
92
93bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
94 const unsigned int prefix_len,
95 struct net_device *dev);
96
97int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
98
99struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
100 const struct in6_addr *addr,
101 struct net_device *dev, int strict);
102
103int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
104 const struct in6_addr *daddr, unsigned int srcprefs,
105 struct in6_addr *saddr);
106int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
107 u32 banned_flags);
108int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
109 u32 banned_flags);
110bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
111 bool match_wildcard);
112bool inet_rcv_saddr_any(const struct sock *sk);
113void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
114void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
115
116void addrconf_add_linklocal(struct inet6_dev *idev,
117 const struct in6_addr *addr, u32 flags);
118
119int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
120 const struct prefix_info *pinfo,
121 struct inet6_dev *in6_dev,
122 const struct in6_addr *addr, int addr_type,
123 u32 addr_flags, bool sllao, bool tokenized,
124 __u32 valid_lft, u32 prefered_lft);
125
126static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
127{
128 memcpy(eui, addr, 3);
129 eui[3] = 0xFF;
130 eui[4] = 0xFE;
131 memcpy(eui + 5, addr + 3, 3);
132}
133
134static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
135{
136 addrconf_addr_eui48_base(eui, addr);
137 eui[0] ^= 2;
138}
139
140static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
141{
142 if (dev->addr_len != ETH_ALEN)
143 return -1;
144
145 /*
146 * The zSeries OSA network cards can be shared among various
147 * OS instances, but the OSA cards have only one MAC address.
148 * This leads to duplicate address conflicts in conjunction
149 * with IPv6 if more than one instance uses the same card.
150 *
151 * The driver for these cards can deliver a unique 16-bit
152 * identifier for each instance sharing the same card. It is
153 * placed instead of 0xFFFE in the interface identifier. The
154 * "u" bit of the interface identifier is not inverted in this
155 * case. Hence the resulting interface identifier has local
156 * scope according to RFC2373.
157 */
158
159 addrconf_addr_eui48_base(eui, dev->dev_addr);
160
161 if (dev->dev_id) {
162 eui[3] = (dev->dev_id >> 8) & 0xFF;
163 eui[4] = dev->dev_id & 0xFF;
164 } else {
165 eui[0] ^= 2;
166 }
167
168 return 0;
169}
170
171static inline unsigned long addrconf_timeout_fixup(u32 timeout,
172 unsigned int unit)
173{
174 if (timeout == 0xffffffff)
175 return ~0UL;
176
177 /*
178 * Avoid arithmetic overflow.
179 * Assuming unit is constant and non-zero, this "if" statement
180 * will go away on 64bit archs.
181 */
182 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
183 return LONG_MAX / unit;
184
185 return timeout;
186}
187
188static inline int addrconf_finite_timeout(unsigned long timeout)
189{
190 return ~timeout;
191}
192
193/*
194 * IPv6 Address Label subsystem (addrlabel.c)
195 */
196int ipv6_addr_label_init(void);
197void ipv6_addr_label_cleanup(void);
198int ipv6_addr_label_rtnl_register(void);
199u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
200 int type, int ifindex);
201
202/*
203 * multicast prototypes (mcast.c)
204 */
205static inline int ipv6_mc_may_pull(struct sk_buff *skb,
206 unsigned int len)
207{
208 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
209 return 0;
210
211 return pskb_may_pull(skb, len);
212}
213
214int ipv6_sock_mc_join(struct sock *sk, int ifindex,
215 const struct in6_addr *addr);
216int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
217 const struct in6_addr *addr);
218void __ipv6_sock_mc_close(struct sock *sk);
219void ipv6_sock_mc_close(struct sock *sk);
220bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
221 const struct in6_addr *src_addr);
222
223int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
224int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
225int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
226void ipv6_mc_up(struct inet6_dev *idev);
227void ipv6_mc_down(struct inet6_dev *idev);
228void ipv6_mc_unmap(struct inet6_dev *idev);
229void ipv6_mc_remap(struct inet6_dev *idev);
230void ipv6_mc_init_dev(struct inet6_dev *idev);
231void ipv6_mc_destroy_dev(struct inet6_dev *idev);
232int ipv6_mc_check_icmpv6(struct sk_buff *skb);
233int ipv6_mc_check_mld(struct sk_buff *skb);
234void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
235
236bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
237 const struct in6_addr *src_addr);
238
239void ipv6_mc_dad_complete(struct inet6_dev *idev);
240
241/*
242 * identify MLD packets for MLD filter exceptions
243 */
244static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
245{
246 struct icmp6hdr *hdr;
247
248 if (nexthdr != IPPROTO_ICMPV6 ||
249 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
250 return false;
251
252 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
253
254 switch (hdr->icmp6_type) {
255 case ICMPV6_MGM_QUERY:
256 case ICMPV6_MGM_REPORT:
257 case ICMPV6_MGM_REDUCTION:
258 case ICMPV6_MLD2_REPORT:
259 return true;
260 default:
261 break;
262 }
263 return false;
264}
265
266void addrconf_prefix_rcv(struct net_device *dev,
267 u8 *opt, int len, bool sllao);
268
269/*
270 * anycast prototypes (anycast.c)
271 */
272int ipv6_sock_ac_join(struct sock *sk, int ifindex,
273 const struct in6_addr *addr);
274int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
275 const struct in6_addr *addr);
276void ipv6_sock_ac_close(struct sock *sk);
277
278int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
279int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
280void ipv6_ac_destroy_dev(struct inet6_dev *idev);
281bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
282 const struct in6_addr *addr);
283bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
284 const struct in6_addr *addr);
285int ipv6_anycast_init(void);
286void ipv6_anycast_cleanup(void);
287
288/* Device notifier */
289int register_inet6addr_notifier(struct notifier_block *nb);
290int unregister_inet6addr_notifier(struct notifier_block *nb);
291int inet6addr_notifier_call_chain(unsigned long val, void *v);
292
293int register_inet6addr_validator_notifier(struct notifier_block *nb);
294int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
295int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
296
297void inet6_netconf_notify_devconf(struct net *net, int event, int type,
298 int ifindex, struct ipv6_devconf *devconf);
299
300/**
301 * __in6_dev_get - get inet6_dev pointer from netdevice
302 * @dev: network device
303 *
304 * Caller must hold rcu_read_lock or RTNL, because this function
305 * does not take a reference on the inet6_dev.
306 */
307static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
308{
309 return rcu_dereference_rtnl(dev->ip6_ptr);
310}
311
312/**
313 * __in6_dev_stats_get - get inet6_dev pointer for stats
314 * @dev: network device
315 * @skb: skb for original incoming interface if neeeded
316 *
317 * Caller must hold rcu_read_lock or RTNL, because this function
318 * does not take a reference on the inet6_dev.
319 */
320static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
321 const struct sk_buff *skb)
322{
323 if (netif_is_l3_master(dev))
324 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
325 return __in6_dev_get(dev);
326}
327
328/**
329 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
330 * @dev: network device
331 *
332 * This is a safer version of __in6_dev_get
333 */
334static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
335{
336 if (likely(dev))
337 return rcu_dereference_rtnl(dev->ip6_ptr);
338 else
339 return NULL;
340}
341
342/**
343 * in6_dev_get - get inet6_dev pointer from netdevice
344 * @dev: network device
345 *
346 * This version can be used in any context, and takes a reference
347 * on the inet6_dev. Callers must use in6_dev_put() later to
348 * release this reference.
349 */
350static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
351{
352 struct inet6_dev *idev;
353
354 rcu_read_lock();
355 idev = rcu_dereference(dev->ip6_ptr);
356 if (idev)
357 refcount_inc(&idev->refcnt);
358 rcu_read_unlock();
359 return idev;
360}
361
362static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
363{
364 struct inet6_dev *idev = __in6_dev_get(dev);
365
366 return idev ? idev->nd_parms : NULL;
367}
368
369void in6_dev_finish_destroy(struct inet6_dev *idev);
370
371static inline void in6_dev_put(struct inet6_dev *idev)
372{
373 if (refcount_dec_and_test(&idev->refcnt))
374 in6_dev_finish_destroy(idev);
375}
376
377static inline void in6_dev_put_clear(struct inet6_dev **pidev)
378{
379 struct inet6_dev *idev = *pidev;
380
381 if (idev) {
382 in6_dev_put(idev);
383 *pidev = NULL;
384 }
385}
386
387static inline void __in6_dev_put(struct inet6_dev *idev)
388{
389 refcount_dec(&idev->refcnt);
390}
391
392static inline void in6_dev_hold(struct inet6_dev *idev)
393{
394 refcount_inc(&idev->refcnt);
395}
396
397/* called with rcu_read_lock held */
398static inline bool ip6_ignore_linkdown(const struct net_device *dev)
399{
400 const struct inet6_dev *idev = __in6_dev_get(dev);
401
402 return !!idev->cnf.ignore_routes_with_linkdown;
403}
404
405void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
406
407static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
408{
409 if (refcount_dec_and_test(&ifp->refcnt))
410 inet6_ifa_finish_destroy(ifp);
411}
412
413static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
414{
415 refcount_dec(&ifp->refcnt);
416}
417
418static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
419{
420 refcount_inc(&ifp->refcnt);
421}
422
423
424/*
425 * compute link-local solicited-node multicast address
426 */
427
428static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
429 struct in6_addr *solicited)
430{
431 ipv6_addr_set(solicited,
432 htonl(0xFF020000), 0,
433 htonl(0x1),
434 htonl(0xFF000000) | addr->s6_addr32[3]);
435}
436
437static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
438{
439#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
440 __be64 *p = (__be64 *)addr;
441 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
442#else
443 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
444 addr->s6_addr32[1] | addr->s6_addr32[2] |
445 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
446#endif
447}
448
449static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
450{
451#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
452 __be64 *p = (__be64 *)addr;
453 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
454#else
455 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
456 addr->s6_addr32[1] | addr->s6_addr32[2] |
457 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
458#endif
459}
460
461static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
462{
463 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
464}
465
466static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
467{
468#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
469 __be64 *p = (__be64 *)addr;
470 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
471 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
472 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
473#else
474 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
475 addr->s6_addr32[1] |
476 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
477 (addr->s6_addr[12] ^ 0xff)) == 0;
478#endif
479}
480
481static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
482{
483#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
484 __be64 *p = (__be64 *)addr;
485
486 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
487 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
488#else
489 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
490 addr->s6_addr32[1] | addr->s6_addr32[2] |
491 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
492#endif
493}
494
495#ifdef CONFIG_PROC_FS
496int if6_proc_init(void);
497void if6_proc_exit(void);
498#endif
499
500#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ADDRCONF_H
3#define _ADDRCONF_H
4
5#define MAX_RTR_SOLICITATIONS -1 /* unlimited */
6#define RTR_SOLICITATION_INTERVAL (4*HZ)
7#define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */
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#define ADDRCONF_NOTIFY_PRIORITY 0
23
24#include <linux/in.h>
25#include <linux/in6.h>
26
27struct prefix_info {
28 __u8 type;
29 __u8 length;
30 __u8 prefix_len;
31
32#if defined(__BIG_ENDIAN_BITFIELD)
33 __u8 onlink : 1,
34 autoconf : 1,
35 reserved : 6;
36#elif defined(__LITTLE_ENDIAN_BITFIELD)
37 __u8 reserved : 6,
38 autoconf : 1,
39 onlink : 1;
40#else
41#error "Please fix <asm/byteorder.h>"
42#endif
43 __be32 valid;
44 __be32 prefered;
45 __be32 reserved2;
46
47 struct in6_addr prefix;
48};
49
50#include <linux/ipv6.h>
51#include <linux/netdevice.h>
52#include <net/if_inet6.h>
53#include <net/ipv6.h>
54
55struct in6_validator_info {
56 struct in6_addr i6vi_addr;
57 struct inet6_dev *i6vi_dev;
58 struct netlink_ext_ack *extack;
59};
60
61struct ifa6_config {
62 const struct in6_addr *pfx;
63 unsigned int plen;
64
65 const struct in6_addr *peer_pfx;
66
67 u32 rt_priority;
68 u32 ifa_flags;
69 u32 preferred_lft;
70 u32 valid_lft;
71 u16 scope;
72};
73
74int addrconf_init(void);
75void addrconf_cleanup(void);
76
77int addrconf_add_ifaddr(struct net *net, void __user *arg);
78int addrconf_del_ifaddr(struct net *net, void __user *arg);
79int addrconf_set_dstaddr(struct net *net, void __user *arg);
80
81int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
82 const struct net_device *dev, int strict);
83int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
84 const struct net_device *dev, bool skip_dev_check,
85 int strict, u32 banned_flags);
86
87#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
88int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
89#endif
90
91int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
92 unsigned char nsegs);
93
94bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
95 const unsigned int prefix_len,
96 struct net_device *dev);
97
98int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
99
100struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
101 struct net_device *dev);
102
103struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
104 const struct in6_addr *addr,
105 struct net_device *dev, int strict);
106
107int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
108 const struct in6_addr *daddr, unsigned int srcprefs,
109 struct in6_addr *saddr);
110int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
111 u32 banned_flags);
112int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
113 u32 banned_flags);
114bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
115 bool match_wildcard);
116bool inet_rcv_saddr_any(const struct sock *sk);
117void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
118void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
119
120void addrconf_add_linklocal(struct inet6_dev *idev,
121 const struct in6_addr *addr, u32 flags);
122
123int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
124 const struct prefix_info *pinfo,
125 struct inet6_dev *in6_dev,
126 const struct in6_addr *addr, int addr_type,
127 u32 addr_flags, bool sllao, bool tokenized,
128 __u32 valid_lft, u32 prefered_lft);
129
130static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
131{
132 memcpy(eui, addr, 3);
133 eui[3] = 0xFF;
134 eui[4] = 0xFE;
135 memcpy(eui + 5, addr + 3, 3);
136}
137
138static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
139{
140 addrconf_addr_eui48_base(eui, addr);
141 eui[0] ^= 2;
142}
143
144static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
145{
146 if (dev->addr_len != ETH_ALEN)
147 return -1;
148
149 /*
150 * The zSeries OSA network cards can be shared among various
151 * OS instances, but the OSA cards have only one MAC address.
152 * This leads to duplicate address conflicts in conjunction
153 * with IPv6 if more than one instance uses the same card.
154 *
155 * The driver for these cards can deliver a unique 16-bit
156 * identifier for each instance sharing the same card. It is
157 * placed instead of 0xFFFE in the interface identifier. The
158 * "u" bit of the interface identifier is not inverted in this
159 * case. Hence the resulting interface identifier has local
160 * scope according to RFC2373.
161 */
162
163 addrconf_addr_eui48_base(eui, dev->dev_addr);
164
165 if (dev->dev_id) {
166 eui[3] = (dev->dev_id >> 8) & 0xFF;
167 eui[4] = dev->dev_id & 0xFF;
168 } else {
169 eui[0] ^= 2;
170 }
171
172 return 0;
173}
174
175static inline unsigned long addrconf_timeout_fixup(u32 timeout,
176 unsigned int unit)
177{
178 if (timeout == 0xffffffff)
179 return ~0UL;
180
181 /*
182 * Avoid arithmetic overflow.
183 * Assuming unit is constant and non-zero, this "if" statement
184 * will go away on 64bit archs.
185 */
186 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
187 return LONG_MAX / unit;
188
189 return timeout;
190}
191
192static inline int addrconf_finite_timeout(unsigned long timeout)
193{
194 return ~timeout;
195}
196
197/*
198 * IPv6 Address Label subsystem (addrlabel.c)
199 */
200int ipv6_addr_label_init(void);
201void ipv6_addr_label_cleanup(void);
202int ipv6_addr_label_rtnl_register(void);
203u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
204 int type, int ifindex);
205
206/*
207 * multicast prototypes (mcast.c)
208 */
209static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
210 unsigned int len)
211{
212 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
213 return false;
214
215 return pskb_may_pull(skb, len);
216}
217
218int ipv6_sock_mc_join(struct sock *sk, int ifindex,
219 const struct in6_addr *addr);
220int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
221 const struct in6_addr *addr);
222void __ipv6_sock_mc_close(struct sock *sk);
223void ipv6_sock_mc_close(struct sock *sk);
224bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
225 const struct in6_addr *src_addr);
226
227int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
228int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
229int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
230void ipv6_mc_up(struct inet6_dev *idev);
231void ipv6_mc_down(struct inet6_dev *idev);
232void ipv6_mc_unmap(struct inet6_dev *idev);
233void ipv6_mc_remap(struct inet6_dev *idev);
234void ipv6_mc_init_dev(struct inet6_dev *idev);
235void ipv6_mc_destroy_dev(struct inet6_dev *idev);
236int ipv6_mc_check_icmpv6(struct sk_buff *skb);
237int ipv6_mc_check_mld(struct sk_buff *skb);
238void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
239
240bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
241 const struct in6_addr *src_addr);
242
243void ipv6_mc_dad_complete(struct inet6_dev *idev);
244
245/*
246 * identify MLD packets for MLD filter exceptions
247 */
248static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
249{
250 struct icmp6hdr *hdr;
251
252 if (nexthdr != IPPROTO_ICMPV6 ||
253 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
254 return false;
255
256 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
257
258 switch (hdr->icmp6_type) {
259 case ICMPV6_MGM_QUERY:
260 case ICMPV6_MGM_REPORT:
261 case ICMPV6_MGM_REDUCTION:
262 case ICMPV6_MLD2_REPORT:
263 return true;
264 default:
265 break;
266 }
267 return false;
268}
269
270void addrconf_prefix_rcv(struct net_device *dev,
271 u8 *opt, int len, bool sllao);
272
273/*
274 * anycast prototypes (anycast.c)
275 */
276int ipv6_sock_ac_join(struct sock *sk, int ifindex,
277 const struct in6_addr *addr);
278int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
279 const struct in6_addr *addr);
280void __ipv6_sock_ac_close(struct sock *sk);
281void ipv6_sock_ac_close(struct sock *sk);
282
283int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
284int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
285void ipv6_ac_destroy_dev(struct inet6_dev *idev);
286bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
287 const struct in6_addr *addr);
288bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
289 const struct in6_addr *addr);
290int ipv6_anycast_init(void);
291void ipv6_anycast_cleanup(void);
292
293/* Device notifier */
294int register_inet6addr_notifier(struct notifier_block *nb);
295int unregister_inet6addr_notifier(struct notifier_block *nb);
296int inet6addr_notifier_call_chain(unsigned long val, void *v);
297
298int register_inet6addr_validator_notifier(struct notifier_block *nb);
299int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
300int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
301
302void inet6_netconf_notify_devconf(struct net *net, int event, int type,
303 int ifindex, struct ipv6_devconf *devconf);
304
305/**
306 * __in6_dev_get - get inet6_dev pointer from netdevice
307 * @dev: network device
308 *
309 * Caller must hold rcu_read_lock or RTNL, because this function
310 * does not take a reference on the inet6_dev.
311 */
312static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
313{
314 return rcu_dereference_rtnl(dev->ip6_ptr);
315}
316
317/**
318 * __in6_dev_stats_get - get inet6_dev pointer for stats
319 * @dev: network device
320 * @skb: skb for original incoming interface if neeeded
321 *
322 * Caller must hold rcu_read_lock or RTNL, because this function
323 * does not take a reference on the inet6_dev.
324 */
325static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
326 const struct sk_buff *skb)
327{
328 if (netif_is_l3_master(dev))
329 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
330 return __in6_dev_get(dev);
331}
332
333/**
334 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
335 * @dev: network device
336 *
337 * This is a safer version of __in6_dev_get
338 */
339static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
340{
341 if (likely(dev))
342 return rcu_dereference_rtnl(dev->ip6_ptr);
343 else
344 return NULL;
345}
346
347/**
348 * in6_dev_get - get inet6_dev pointer from netdevice
349 * @dev: network device
350 *
351 * This version can be used in any context, and takes a reference
352 * on the inet6_dev. Callers must use in6_dev_put() later to
353 * release this reference.
354 */
355static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
356{
357 struct inet6_dev *idev;
358
359 rcu_read_lock();
360 idev = rcu_dereference(dev->ip6_ptr);
361 if (idev)
362 refcount_inc(&idev->refcnt);
363 rcu_read_unlock();
364 return idev;
365}
366
367static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
368{
369 struct inet6_dev *idev = __in6_dev_get(dev);
370
371 return idev ? idev->nd_parms : NULL;
372}
373
374void in6_dev_finish_destroy(struct inet6_dev *idev);
375
376static inline void in6_dev_put(struct inet6_dev *idev)
377{
378 if (refcount_dec_and_test(&idev->refcnt))
379 in6_dev_finish_destroy(idev);
380}
381
382static inline void in6_dev_put_clear(struct inet6_dev **pidev)
383{
384 struct inet6_dev *idev = *pidev;
385
386 if (idev) {
387 in6_dev_put(idev);
388 *pidev = NULL;
389 }
390}
391
392static inline void __in6_dev_put(struct inet6_dev *idev)
393{
394 refcount_dec(&idev->refcnt);
395}
396
397static inline void in6_dev_hold(struct inet6_dev *idev)
398{
399 refcount_inc(&idev->refcnt);
400}
401
402/* called with rcu_read_lock held */
403static inline bool ip6_ignore_linkdown(const struct net_device *dev)
404{
405 const struct inet6_dev *idev = __in6_dev_get(dev);
406
407 return !!idev->cnf.ignore_routes_with_linkdown;
408}
409
410void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
411
412static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
413{
414 if (refcount_dec_and_test(&ifp->refcnt))
415 inet6_ifa_finish_destroy(ifp);
416}
417
418static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
419{
420 refcount_dec(&ifp->refcnt);
421}
422
423static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
424{
425 refcount_inc(&ifp->refcnt);
426}
427
428
429/*
430 * compute link-local solicited-node multicast address
431 */
432
433static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
434 struct in6_addr *solicited)
435{
436 ipv6_addr_set(solicited,
437 htonl(0xFF020000), 0,
438 htonl(0x1),
439 htonl(0xFF000000) | addr->s6_addr32[3]);
440}
441
442static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
443{
444#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
445 __be64 *p = (__force __be64 *)addr;
446 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
447#else
448 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
449 addr->s6_addr32[1] | addr->s6_addr32[2] |
450 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
451#endif
452}
453
454static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
455{
456#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
457 __be64 *p = (__force __be64 *)addr;
458 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
459#else
460 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
461 addr->s6_addr32[1] | addr->s6_addr32[2] |
462 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
463#endif
464}
465
466static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
467{
468 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
469}
470
471static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
472{
473#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
474 __be64 *p = (__force __be64 *)addr;
475 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
476 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
477 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
478#else
479 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
480 addr->s6_addr32[1] |
481 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
482 (addr->s6_addr[12] ^ 0xff)) == 0;
483#endif
484}
485
486static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
487{
488#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
489 __be64 *p = (__force __be64 *)addr;
490
491 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
492 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
493#else
494 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
495 addr->s6_addr32[1] | addr->s6_addr32[2] |
496 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
497#endif
498}
499
500#ifdef CONFIG_PROC_FS
501int if6_proc_init(void);
502void if6_proc_exit(void);
503#endif
504
505#endif