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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 u8 ifa_proto;
68
69 const struct in6_addr *peer_pfx;
70
71 u32 rt_priority;
72 u32 ifa_flags;
73 u32 preferred_lft;
74 u32 valid_lft;
75 u16 scope;
76};
77
78int addrconf_init(void);
79void addrconf_cleanup(void);
80
81int addrconf_add_ifaddr(struct net *net, void __user *arg);
82int addrconf_del_ifaddr(struct net *net, void __user *arg);
83int addrconf_set_dstaddr(struct net *net, void __user *arg);
84
85int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
86 const struct net_device *dev, int strict);
87int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
88 const struct net_device *dev, bool skip_dev_check,
89 int strict, u32 banned_flags);
90
91#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
92int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
93#endif
94
95int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
96 unsigned char nsegs);
97
98bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
99 const unsigned int prefix_len,
100 struct net_device *dev);
101
102int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
103
104struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
105 struct net_device *dev);
106
107struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
108 const struct in6_addr *addr,
109 struct net_device *dev, int strict);
110
111int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
112 const struct in6_addr *daddr, unsigned int srcprefs,
113 struct in6_addr *saddr);
114int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
115 u32 banned_flags);
116bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
117 bool match_wildcard);
118bool inet_rcv_saddr_any(const struct sock *sk);
119void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
120void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
121
122void addrconf_add_linklocal(struct inet6_dev *idev,
123 const struct in6_addr *addr, u32 flags);
124
125int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
126 const struct prefix_info *pinfo,
127 struct inet6_dev *in6_dev,
128 const struct in6_addr *addr, int addr_type,
129 u32 addr_flags, bool sllao, bool tokenized,
130 __u32 valid_lft, u32 prefered_lft);
131
132static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
133{
134 memcpy(eui, addr, 3);
135 eui[3] = 0xFF;
136 eui[4] = 0xFE;
137 memcpy(eui + 5, addr + 3, 3);
138}
139
140static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
141{
142 addrconf_addr_eui48_base(eui, addr);
143 eui[0] ^= 2;
144}
145
146static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
147{
148 if (dev->addr_len != ETH_ALEN)
149 return -1;
150
151 /*
152 * The zSeries OSA network cards can be shared among various
153 * OS instances, but the OSA cards have only one MAC address.
154 * This leads to duplicate address conflicts in conjunction
155 * with IPv6 if more than one instance uses the same card.
156 *
157 * The driver for these cards can deliver a unique 16-bit
158 * identifier for each instance sharing the same card. It is
159 * placed instead of 0xFFFE in the interface identifier. The
160 * "u" bit of the interface identifier is not inverted in this
161 * case. Hence the resulting interface identifier has local
162 * scope according to RFC2373.
163 */
164
165 addrconf_addr_eui48_base(eui, dev->dev_addr);
166
167 if (dev->dev_id) {
168 eui[3] = (dev->dev_id >> 8) & 0xFF;
169 eui[4] = dev->dev_id & 0xFF;
170 } else {
171 eui[0] ^= 2;
172 }
173
174 return 0;
175}
176
177static inline unsigned long addrconf_timeout_fixup(u32 timeout,
178 unsigned int unit)
179{
180 if (timeout == 0xffffffff)
181 return ~0UL;
182
183 /*
184 * Avoid arithmetic overflow.
185 * Assuming unit is constant and non-zero, this "if" statement
186 * will go away on 64bit archs.
187 */
188 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
189 return LONG_MAX / unit;
190
191 return timeout;
192}
193
194static inline int addrconf_finite_timeout(unsigned long timeout)
195{
196 return ~timeout;
197}
198
199/*
200 * IPv6 Address Label subsystem (addrlabel.c)
201 */
202int ipv6_addr_label_init(void);
203void ipv6_addr_label_cleanup(void);
204int ipv6_addr_label_rtnl_register(void);
205u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
206 int type, int ifindex);
207
208/*
209 * multicast prototypes (mcast.c)
210 */
211static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
212 unsigned int len)
213{
214 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
215 return false;
216
217 return pskb_may_pull(skb, len);
218}
219
220int ipv6_sock_mc_join(struct sock *sk, int ifindex,
221 const struct in6_addr *addr);
222int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
223 const struct in6_addr *addr);
224void __ipv6_sock_mc_close(struct sock *sk);
225void ipv6_sock_mc_close(struct sock *sk);
226bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
227 const struct in6_addr *src_addr);
228
229int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
230int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
231int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
232void ipv6_mc_up(struct inet6_dev *idev);
233void ipv6_mc_down(struct inet6_dev *idev);
234void ipv6_mc_unmap(struct inet6_dev *idev);
235void ipv6_mc_remap(struct inet6_dev *idev);
236void ipv6_mc_init_dev(struct inet6_dev *idev);
237void ipv6_mc_destroy_dev(struct inet6_dev *idev);
238int ipv6_mc_check_mld(struct sk_buff *skb);
239void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
240
241bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
242 const struct in6_addr *src_addr);
243
244void ipv6_mc_dad_complete(struct inet6_dev *idev);
245
246/*
247 * identify MLD packets for MLD filter exceptions
248 */
249static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
250{
251 struct icmp6hdr *hdr;
252
253 if (nexthdr != IPPROTO_ICMPV6 ||
254 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
255 return false;
256
257 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
258
259 switch (hdr->icmp6_type) {
260 case ICMPV6_MGM_QUERY:
261 case ICMPV6_MGM_REPORT:
262 case ICMPV6_MGM_REDUCTION:
263 case ICMPV6_MLD2_REPORT:
264 return true;
265 default:
266 break;
267 }
268 return false;
269}
270
271void addrconf_prefix_rcv(struct net_device *dev,
272 u8 *opt, int len, bool sllao);
273
274/*
275 * anycast prototypes (anycast.c)
276 */
277int ipv6_sock_ac_join(struct sock *sk, int ifindex,
278 const struct in6_addr *addr);
279int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
280 const struct in6_addr *addr);
281void __ipv6_sock_ac_close(struct sock *sk);
282void ipv6_sock_ac_close(struct sock *sk);
283
284int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
285int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
286void ipv6_ac_destroy_dev(struct inet6_dev *idev);
287bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
288 const struct in6_addr *addr);
289bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
290 const struct in6_addr *addr);
291int ipv6_anycast_init(void);
292void ipv6_anycast_cleanup(void);
293
294/* Device notifier */
295int register_inet6addr_notifier(struct notifier_block *nb);
296int unregister_inet6addr_notifier(struct notifier_block *nb);
297int inet6addr_notifier_call_chain(unsigned long val, void *v);
298
299int register_inet6addr_validator_notifier(struct notifier_block *nb);
300int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
301int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
302
303void inet6_netconf_notify_devconf(struct net *net, int event, int type,
304 int ifindex, struct ipv6_devconf *devconf);
305
306/**
307 * __in6_dev_get - get inet6_dev pointer from netdevice
308 * @dev: network device
309 *
310 * Caller must hold rcu_read_lock or RTNL, because this function
311 * does not take a reference on the inet6_dev.
312 */
313static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
314{
315 return rcu_dereference_rtnl(dev->ip6_ptr);
316}
317
318/**
319 * __in6_dev_stats_get - get inet6_dev pointer for stats
320 * @dev: network device
321 * @skb: skb for original incoming interface if neeeded
322 *
323 * Caller must hold rcu_read_lock or RTNL, because this function
324 * does not take a reference on the inet6_dev.
325 */
326static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
327 const struct sk_buff *skb)
328{
329 if (netif_is_l3_master(dev))
330 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
331 return __in6_dev_get(dev);
332}
333
334/**
335 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
336 * @dev: network device
337 *
338 * This is a safer version of __in6_dev_get
339 */
340static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
341{
342 if (likely(dev))
343 return rcu_dereference_rtnl(dev->ip6_ptr);
344 else
345 return NULL;
346}
347
348/**
349 * in6_dev_get - get inet6_dev pointer from netdevice
350 * @dev: network device
351 *
352 * This version can be used in any context, and takes a reference
353 * on the inet6_dev. Callers must use in6_dev_put() later to
354 * release this reference.
355 */
356static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
357{
358 struct inet6_dev *idev;
359
360 rcu_read_lock();
361 idev = rcu_dereference(dev->ip6_ptr);
362 if (idev)
363 refcount_inc(&idev->refcnt);
364 rcu_read_unlock();
365 return idev;
366}
367
368static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
369{
370 struct inet6_dev *idev = __in6_dev_get(dev);
371
372 return idev ? idev->nd_parms : NULL;
373}
374
375void in6_dev_finish_destroy(struct inet6_dev *idev);
376
377static inline void in6_dev_put(struct inet6_dev *idev)
378{
379 if (refcount_dec_and_test(&idev->refcnt))
380 in6_dev_finish_destroy(idev);
381}
382
383static inline void in6_dev_put_clear(struct inet6_dev **pidev)
384{
385 struct inet6_dev *idev = *pidev;
386
387 if (idev) {
388 in6_dev_put(idev);
389 *pidev = NULL;
390 }
391}
392
393static inline void __in6_dev_put(struct inet6_dev *idev)
394{
395 refcount_dec(&idev->refcnt);
396}
397
398static inline void in6_dev_hold(struct inet6_dev *idev)
399{
400 refcount_inc(&idev->refcnt);
401}
402
403/* called with rcu_read_lock held */
404static inline bool ip6_ignore_linkdown(const struct net_device *dev)
405{
406 const struct inet6_dev *idev = __in6_dev_get(dev);
407
408 if (unlikely(!idev))
409 return true;
410
411 return !!idev->cnf.ignore_routes_with_linkdown;
412}
413
414void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
415
416static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
417{
418 if (refcount_dec_and_test(&ifp->refcnt))
419 inet6_ifa_finish_destroy(ifp);
420}
421
422static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
423{
424 refcount_dec(&ifp->refcnt);
425}
426
427static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
428{
429 refcount_inc(&ifp->refcnt);
430}
431
432
433/*
434 * compute link-local solicited-node multicast address
435 */
436
437static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
438 struct in6_addr *solicited)
439{
440 ipv6_addr_set(solicited,
441 htonl(0xFF020000), 0,
442 htonl(0x1),
443 htonl(0xFF000000) | addr->s6_addr32[3]);
444}
445
446static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
447{
448#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
449 __be64 *p = (__force __be64 *)addr;
450 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
451#else
452 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
453 addr->s6_addr32[1] | addr->s6_addr32[2] |
454 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
455#endif
456}
457
458static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
459{
460#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
461 __be64 *p = (__force __be64 *)addr;
462 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
463#else
464 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
465 addr->s6_addr32[1] | addr->s6_addr32[2] |
466 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
467#endif
468}
469
470static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
471{
472 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
473}
474
475static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
476{
477#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
478 __be64 *p = (__force __be64 *)addr;
479 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
480 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
481 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
482#else
483 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
484 addr->s6_addr32[1] |
485 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
486 (addr->s6_addr[12] ^ 0xff)) == 0;
487#endif
488}
489
490static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
491{
492#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
493 __be64 *p = (__force __be64 *)addr;
494
495 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
496 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
497#else
498 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
499 addr->s6_addr32[1] | addr->s6_addr32[2] |
500 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
501#endif
502}
503
504#ifdef CONFIG_PROC_FS
505int if6_proc_init(void);
506void if6_proc_exit(void);
507#endif
508
509#endif
1#ifndef _ADDRCONF_H
2#define _ADDRCONF_H
3
4#define MAX_RTR_SOLICITATIONS -1 /* unlimited */
5#define RTR_SOLICITATION_INTERVAL (4*HZ)
6#define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */
7
8#define MIN_VALID_LIFETIME (2*3600) /* 2 hours */
9
10#define TEMP_VALID_LIFETIME (7*86400)
11#define TEMP_PREFERRED_LIFETIME (86400)
12#define REGEN_MAX_RETRY (3)
13#define MAX_DESYNC_FACTOR (600)
14
15#define ADDR_CHECK_FREQUENCY (120*HZ)
16
17#define IPV6_MAX_ADDRESSES 16
18
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
23#include <linux/in.h>
24#include <linux/in6.h>
25
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
42 __be32 valid;
43 __be32 prefered;
44 __be32 reserved2;
45
46 struct in6_addr prefix;
47};
48
49
50#include <linux/netdevice.h>
51#include <net/if_inet6.h>
52#include <net/ipv6.h>
53
54#define IN6_ADDR_HSIZE_SHIFT 4
55#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
56
57int addrconf_init(void);
58void addrconf_cleanup(void);
59
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);
63
64int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
65 const struct net_device *dev, int strict);
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);
69
70#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
71int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
72#endif
73
74bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
75 const unsigned int prefix_len,
76 struct net_device *dev);
77
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,
88 u32 banned_flags);
89int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
90 u32 banned_flags);
91int ipv4_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
92 bool match_wildcard);
93int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
94 bool match_wildcard);
95void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
96void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
97
98void addrconf_add_linklocal(struct inet6_dev *idev,
99 const struct in6_addr *addr, u32 flags);
100
101int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
102 const struct prefix_info *pinfo,
103 struct inet6_dev *in6_dev,
104 const struct in6_addr *addr, int addr_type,
105 u32 addr_flags, bool sllao, bool tokenized,
106 __u32 valid_lft, u32 prefered_lft);
107
108static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
109{
110 if (dev->addr_len != ETH_ALEN)
111 return -1;
112 memcpy(eui, dev->dev_addr, 3);
113 memcpy(eui + 5, dev->dev_addr + 3, 3);
114
115 /*
116 * The zSeries OSA network cards can be shared among various
117 * OS instances, but the OSA cards have only one MAC address.
118 * This leads to duplicate address conflicts in conjunction
119 * with IPv6 if more than one instance uses the same card.
120 *
121 * The driver for these cards can deliver a unique 16-bit
122 * identifier for each instance sharing the same card. It is
123 * placed instead of 0xFFFE in the interface identifier. The
124 * "u" bit of the interface identifier is not inverted in this
125 * case. Hence the resulting interface identifier has local
126 * scope according to RFC2373.
127 */
128 if (dev->dev_id) {
129 eui[3] = (dev->dev_id >> 8) & 0xFF;
130 eui[4] = dev->dev_id & 0xFF;
131 } else {
132 eui[3] = 0xFF;
133 eui[4] = 0xFE;
134 eui[0] ^= 2;
135 }
136 return 0;
137}
138
139static inline unsigned long addrconf_timeout_fixup(u32 timeout,
140 unsigned int unit)
141{
142 if (timeout == 0xffffffff)
143 return ~0UL;
144
145 /*
146 * Avoid arithmetic overflow.
147 * Assuming unit is constant and non-zero, this "if" statement
148 * will go away on 64bit archs.
149 */
150 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
151 return LONG_MAX / unit;
152
153 return timeout;
154}
155
156static inline int addrconf_finite_timeout(unsigned long timeout)
157{
158 return ~timeout;
159}
160
161/*
162 * IPv6 Address Label subsystem (addrlabel.c)
163 */
164int ipv6_addr_label_init(void);
165void ipv6_addr_label_cleanup(void);
166void ipv6_addr_label_rtnl_register(void);
167u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
168 int type, int ifindex);
169
170/*
171 * multicast prototypes (mcast.c)
172 */
173int ipv6_sock_mc_join(struct sock *sk, int ifindex,
174 const struct in6_addr *addr);
175int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
176 const struct in6_addr *addr);
177void __ipv6_sock_mc_close(struct sock *sk);
178void ipv6_sock_mc_close(struct sock *sk);
179bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
180 const struct in6_addr *src_addr);
181
182int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
183int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
184int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
185void ipv6_mc_up(struct inet6_dev *idev);
186void ipv6_mc_down(struct inet6_dev *idev);
187void ipv6_mc_unmap(struct inet6_dev *idev);
188void ipv6_mc_remap(struct inet6_dev *idev);
189void ipv6_mc_init_dev(struct inet6_dev *idev);
190void ipv6_mc_destroy_dev(struct inet6_dev *idev);
191int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
192void addrconf_dad_failure(struct inet6_ifaddr *ifp);
193
194bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
195 const struct in6_addr *src_addr);
196
197void ipv6_mc_dad_complete(struct inet6_dev *idev);
198
199/* A stub used by vxlan module. This is ugly, ideally these
200 * symbols should be built into the core kernel.
201 */
202struct ipv6_stub {
203 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
204 const struct in6_addr *addr);
205 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
206 const struct in6_addr *addr);
207 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
208 struct dst_entry **dst, struct flowi6 *fl6);
209 void (*udpv6_encap_enable)(void);
210 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
211 const struct in6_addr *solicited_addr,
212 bool router, bool solicited, bool override, bool inc_opt);
213 struct neigh_table *nd_tbl;
214};
215extern const struct ipv6_stub *ipv6_stub __read_mostly;
216
217/*
218 * identify MLD packets for MLD filter exceptions
219 */
220static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
221{
222 struct icmp6hdr *hdr;
223
224 if (nexthdr != IPPROTO_ICMPV6 ||
225 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
226 return false;
227
228 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
229
230 switch (hdr->icmp6_type) {
231 case ICMPV6_MGM_QUERY:
232 case ICMPV6_MGM_REPORT:
233 case ICMPV6_MGM_REDUCTION:
234 case ICMPV6_MLD2_REPORT:
235 return true;
236 default:
237 break;
238 }
239 return false;
240}
241
242void addrconf_prefix_rcv(struct net_device *dev,
243 u8 *opt, int len, bool sllao);
244
245/*
246 * anycast prototypes (anycast.c)
247 */
248int ipv6_sock_ac_join(struct sock *sk, int ifindex,
249 const struct in6_addr *addr);
250int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
251 const struct in6_addr *addr);
252void ipv6_sock_ac_close(struct sock *sk);
253
254int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
255int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
256void ipv6_ac_destroy_dev(struct inet6_dev *idev);
257bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
258 const struct in6_addr *addr);
259bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
260 const struct in6_addr *addr);
261
262/* Device notifier */
263int register_inet6addr_notifier(struct notifier_block *nb);
264int unregister_inet6addr_notifier(struct notifier_block *nb);
265int inet6addr_notifier_call_chain(unsigned long val, void *v);
266
267void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
268 struct ipv6_devconf *devconf);
269
270/**
271 * __in6_dev_get - get inet6_dev pointer from netdevice
272 * @dev: network device
273 *
274 * Caller must hold rcu_read_lock or RTNL, because this function
275 * does not take a reference on the inet6_dev.
276 */
277static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
278{
279 return rcu_dereference_rtnl(dev->ip6_ptr);
280}
281
282/**
283 * in6_dev_get - get inet6_dev pointer from netdevice
284 * @dev: network device
285 *
286 * This version can be used in any context, and takes a reference
287 * on the inet6_dev. Callers must use in6_dev_put() later to
288 * release this reference.
289 */
290static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
291{
292 struct inet6_dev *idev;
293
294 rcu_read_lock();
295 idev = rcu_dereference(dev->ip6_ptr);
296 if (idev)
297 atomic_inc(&idev->refcnt);
298 rcu_read_unlock();
299 return idev;
300}
301
302static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
303{
304 struct inet6_dev *idev = __in6_dev_get(dev);
305
306 return idev ? idev->nd_parms : NULL;
307}
308
309void in6_dev_finish_destroy(struct inet6_dev *idev);
310
311static inline void in6_dev_put(struct inet6_dev *idev)
312{
313 if (atomic_dec_and_test(&idev->refcnt))
314 in6_dev_finish_destroy(idev);
315}
316
317static inline void __in6_dev_put(struct inet6_dev *idev)
318{
319 atomic_dec(&idev->refcnt);
320}
321
322static inline void in6_dev_hold(struct inet6_dev *idev)
323{
324 atomic_inc(&idev->refcnt);
325}
326
327void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
328
329static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
330{
331 if (atomic_dec_and_test(&ifp->refcnt))
332 inet6_ifa_finish_destroy(ifp);
333}
334
335static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
336{
337 atomic_dec(&ifp->refcnt);
338}
339
340static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
341{
342 atomic_inc(&ifp->refcnt);
343}
344
345
346/*
347 * compute link-local solicited-node multicast address
348 */
349
350static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
351 struct in6_addr *solicited)
352{
353 ipv6_addr_set(solicited,
354 htonl(0xFF020000), 0,
355 htonl(0x1),
356 htonl(0xFF000000) | addr->s6_addr32[3]);
357}
358
359static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
360{
361#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
362 __be64 *p = (__be64 *)addr;
363 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
364#else
365 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
366 addr->s6_addr32[1] | addr->s6_addr32[2] |
367 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
368#endif
369}
370
371static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
372{
373#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
374 __be64 *p = (__be64 *)addr;
375 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
376#else
377 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
378 addr->s6_addr32[1] | addr->s6_addr32[2] |
379 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
380#endif
381}
382
383static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
384{
385 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
386}
387
388static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
389{
390#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
391 __be64 *p = (__be64 *)addr;
392 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
393 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
394 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
395#else
396 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
397 addr->s6_addr32[1] |
398 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
399 (addr->s6_addr[12] ^ 0xff)) == 0;
400#endif
401}
402
403#ifdef CONFIG_PROC_FS
404int if6_proc_init(void);
405void if6_proc_exit(void);
406#endif
407
408#endif