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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) /* 1 week */
12#define TEMP_PREFERRED_LIFETIME (86400) /* 24 hours */
13#define REGEN_MIN_ADVANCE (2) /* 2 seconds */
14#define REGEN_MAX_RETRY (3)
15#define MAX_DESYNC_FACTOR (600)
16
17#define ADDR_CHECK_FREQUENCY (120*HZ)
18
19#define IPV6_MAX_ADDRESSES 16
20
21#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
22#define ADDRCONF_TIMER_FUZZ (HZ / 4)
23#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
24
25#define ADDRCONF_NOTIFY_PRIORITY 0
26
27#include <linux/in.h>
28#include <linux/in6.h>
29
30struct prefix_info {
31 __u8 type;
32 __u8 length;
33 __u8 prefix_len;
34
35 union __packed {
36 __u8 flags;
37 struct __packed {
38#if defined(__BIG_ENDIAN_BITFIELD)
39 __u8 onlink : 1,
40 autoconf : 1,
41 routeraddr : 1,
42 preferpd : 1,
43 reserved : 4;
44#elif defined(__LITTLE_ENDIAN_BITFIELD)
45 __u8 reserved : 4,
46 preferpd : 1,
47 routeraddr : 1,
48 autoconf : 1,
49 onlink : 1;
50#else
51#error "Please fix <asm/byteorder.h>"
52#endif
53 };
54 };
55 __be32 valid;
56 __be32 prefered;
57 __be32 reserved2;
58
59 struct in6_addr prefix;
60};
61
62/* rfc4861 4.6.2: IPv6 PIO is 32 bytes in size */
63static_assert(sizeof(struct prefix_info) == 32);
64
65#include <linux/ipv6.h>
66#include <linux/netdevice.h>
67#include <net/if_inet6.h>
68#include <net/ipv6.h>
69
70struct in6_validator_info {
71 struct in6_addr i6vi_addr;
72 struct inet6_dev *i6vi_dev;
73 struct netlink_ext_ack *extack;
74};
75
76struct ifa6_config {
77 const struct in6_addr *pfx;
78 unsigned int plen;
79
80 u8 ifa_proto;
81
82 const struct in6_addr *peer_pfx;
83
84 u32 rt_priority;
85 u32 ifa_flags;
86 u32 preferred_lft;
87 u32 valid_lft;
88 u16 scope;
89};
90
91int addrconf_init(void);
92void addrconf_cleanup(void);
93
94int addrconf_add_ifaddr(struct net *net, void __user *arg);
95int addrconf_del_ifaddr(struct net *net, void __user *arg);
96int addrconf_set_dstaddr(struct net *net, void __user *arg);
97
98int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
99 const struct net_device *dev, int strict);
100int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
101 const struct net_device *dev, bool skip_dev_check,
102 int strict, u32 banned_flags);
103
104#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
105int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
106#endif
107
108int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
109 unsigned char nsegs);
110
111bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
112 const unsigned int prefix_len,
113 struct net_device *dev);
114
115int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
116
117struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
118 struct net_device *dev);
119
120struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
121 const struct in6_addr *addr,
122 struct net_device *dev, int strict);
123
124int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
125 const struct in6_addr *daddr, unsigned int srcprefs,
126 struct in6_addr *saddr);
127int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
128 u32 banned_flags);
129bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
130 bool match_wildcard);
131bool inet_rcv_saddr_any(const struct sock *sk);
132void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
133void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
134
135void addrconf_add_linklocal(struct inet6_dev *idev,
136 const struct in6_addr *addr, u32 flags);
137
138int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
139 const struct prefix_info *pinfo,
140 struct inet6_dev *in6_dev,
141 const struct in6_addr *addr, int addr_type,
142 u32 addr_flags, bool sllao, bool tokenized,
143 __u32 valid_lft, u32 prefered_lft);
144
145static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
146{
147 memcpy(eui, addr, 3);
148 eui[3] = 0xFF;
149 eui[4] = 0xFE;
150 memcpy(eui + 5, addr + 3, 3);
151}
152
153static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
154{
155 addrconf_addr_eui48_base(eui, addr);
156 eui[0] ^= 2;
157}
158
159static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
160{
161 if (dev->addr_len != ETH_ALEN)
162 return -1;
163
164 /*
165 * The zSeries OSA network cards can be shared among various
166 * OS instances, but the OSA cards have only one MAC address.
167 * This leads to duplicate address conflicts in conjunction
168 * with IPv6 if more than one instance uses the same card.
169 *
170 * The driver for these cards can deliver a unique 16-bit
171 * identifier for each instance sharing the same card. It is
172 * placed instead of 0xFFFE in the interface identifier. The
173 * "u" bit of the interface identifier is not inverted in this
174 * case. Hence the resulting interface identifier has local
175 * scope according to RFC2373.
176 */
177
178 addrconf_addr_eui48_base(eui, dev->dev_addr);
179
180 if (dev->dev_id) {
181 eui[3] = (dev->dev_id >> 8) & 0xFF;
182 eui[4] = dev->dev_id & 0xFF;
183 } else {
184 eui[0] ^= 2;
185 }
186
187 return 0;
188}
189
190#define INFINITY_LIFE_TIME 0xFFFFFFFF
191
192static inline unsigned long addrconf_timeout_fixup(u32 timeout,
193 unsigned int unit)
194{
195 if (timeout == INFINITY_LIFE_TIME)
196 return ~0UL;
197
198 /*
199 * Avoid arithmetic overflow.
200 * Assuming unit is constant and non-zero, this "if" statement
201 * will go away on 64bit archs.
202 */
203 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
204 return LONG_MAX / unit;
205
206 return timeout;
207}
208
209static inline int addrconf_finite_timeout(unsigned long timeout)
210{
211 return ~timeout;
212}
213
214/*
215 * IPv6 Address Label subsystem (addrlabel.c)
216 */
217int ipv6_addr_label_init(void);
218void ipv6_addr_label_cleanup(void);
219int ipv6_addr_label_rtnl_register(void);
220u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
221 int type, int ifindex);
222
223/*
224 * multicast prototypes (mcast.c)
225 */
226static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
227 unsigned int len)
228{
229 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
230 return false;
231
232 return pskb_may_pull(skb, len);
233}
234
235int ipv6_sock_mc_join(struct sock *sk, int ifindex,
236 const struct in6_addr *addr);
237int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
238 const struct in6_addr *addr);
239void __ipv6_sock_mc_close(struct sock *sk);
240void ipv6_sock_mc_close(struct sock *sk);
241bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr,
242 const struct in6_addr *src_addr);
243
244int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
245int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
246int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
247void ipv6_mc_up(struct inet6_dev *idev);
248void ipv6_mc_down(struct inet6_dev *idev);
249void ipv6_mc_unmap(struct inet6_dev *idev);
250void ipv6_mc_remap(struct inet6_dev *idev);
251void ipv6_mc_init_dev(struct inet6_dev *idev);
252void ipv6_mc_destroy_dev(struct inet6_dev *idev);
253int ipv6_mc_check_mld(struct sk_buff *skb);
254void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
255
256bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
257 const struct in6_addr *src_addr);
258
259void ipv6_mc_dad_complete(struct inet6_dev *idev);
260
261/*
262 * identify MLD packets for MLD filter exceptions
263 */
264static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
265{
266 struct icmp6hdr *hdr;
267
268 if (nexthdr != IPPROTO_ICMPV6 ||
269 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
270 return false;
271
272 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
273
274 switch (hdr->icmp6_type) {
275 case ICMPV6_MGM_QUERY:
276 case ICMPV6_MGM_REPORT:
277 case ICMPV6_MGM_REDUCTION:
278 case ICMPV6_MLD2_REPORT:
279 return true;
280 default:
281 break;
282 }
283 return false;
284}
285
286void addrconf_prefix_rcv(struct net_device *dev,
287 u8 *opt, int len, bool sllao);
288
289/*
290 * anycast prototypes (anycast.c)
291 */
292int ipv6_sock_ac_join(struct sock *sk, int ifindex,
293 const struct in6_addr *addr);
294int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
295 const struct in6_addr *addr);
296void __ipv6_sock_ac_close(struct sock *sk);
297void ipv6_sock_ac_close(struct sock *sk);
298
299int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
300int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
301void ipv6_ac_destroy_dev(struct inet6_dev *idev);
302bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
303 const struct in6_addr *addr);
304bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
305 const struct in6_addr *addr);
306int ipv6_anycast_init(void);
307void ipv6_anycast_cleanup(void);
308
309/* Device notifier */
310int register_inet6addr_notifier(struct notifier_block *nb);
311int unregister_inet6addr_notifier(struct notifier_block *nb);
312int inet6addr_notifier_call_chain(unsigned long val, void *v);
313
314int register_inet6addr_validator_notifier(struct notifier_block *nb);
315int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
316int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
317
318void inet6_netconf_notify_devconf(struct net *net, int event, int type,
319 int ifindex, struct ipv6_devconf *devconf);
320
321/**
322 * __in6_dev_get - get inet6_dev pointer from netdevice
323 * @dev: network device
324 *
325 * Caller must hold rcu_read_lock or RTNL, because this function
326 * does not take a reference on the inet6_dev.
327 */
328static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
329{
330 return rcu_dereference_rtnl(dev->ip6_ptr);
331}
332
333/**
334 * __in6_dev_stats_get - get inet6_dev pointer for stats
335 * @dev: network device
336 * @skb: skb for original incoming interface if needed
337 *
338 * Caller must hold rcu_read_lock or RTNL, because this function
339 * does not take a reference on the inet6_dev.
340 */
341static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
342 const struct sk_buff *skb)
343{
344 if (netif_is_l3_master(dev))
345 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
346 return __in6_dev_get(dev);
347}
348
349/**
350 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
351 * @dev: network device
352 *
353 * This is a safer version of __in6_dev_get
354 */
355static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
356{
357 if (likely(dev))
358 return rcu_dereference_rtnl(dev->ip6_ptr);
359 else
360 return NULL;
361}
362
363/**
364 * in6_dev_get - get inet6_dev pointer from netdevice
365 * @dev: network device
366 *
367 * This version can be used in any context, and takes a reference
368 * on the inet6_dev. Callers must use in6_dev_put() later to
369 * release this reference.
370 */
371static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
372{
373 struct inet6_dev *idev;
374
375 rcu_read_lock();
376 idev = rcu_dereference(dev->ip6_ptr);
377 if (idev)
378 refcount_inc(&idev->refcnt);
379 rcu_read_unlock();
380 return idev;
381}
382
383static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
384{
385 struct inet6_dev *idev = __in6_dev_get(dev);
386
387 return idev ? idev->nd_parms : NULL;
388}
389
390void in6_dev_finish_destroy(struct inet6_dev *idev);
391
392static inline void in6_dev_put(struct inet6_dev *idev)
393{
394 if (refcount_dec_and_test(&idev->refcnt))
395 in6_dev_finish_destroy(idev);
396}
397
398static inline void in6_dev_put_clear(struct inet6_dev **pidev)
399{
400 struct inet6_dev *idev = *pidev;
401
402 if (idev) {
403 in6_dev_put(idev);
404 *pidev = NULL;
405 }
406}
407
408static inline void __in6_dev_put(struct inet6_dev *idev)
409{
410 refcount_dec(&idev->refcnt);
411}
412
413static inline void in6_dev_hold(struct inet6_dev *idev)
414{
415 refcount_inc(&idev->refcnt);
416}
417
418/* called with rcu_read_lock held */
419static inline bool ip6_ignore_linkdown(const struct net_device *dev)
420{
421 const struct inet6_dev *idev = __in6_dev_get(dev);
422
423 if (unlikely(!idev))
424 return true;
425
426 return !!READ_ONCE(idev->cnf.ignore_routes_with_linkdown);
427}
428
429void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
430
431static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
432{
433 if (refcount_dec_and_test(&ifp->refcnt))
434 inet6_ifa_finish_destroy(ifp);
435}
436
437static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
438{
439 refcount_dec(&ifp->refcnt);
440}
441
442static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
443{
444 refcount_inc(&ifp->refcnt);
445}
446
447static inline bool in6_ifa_hold_safe(struct inet6_ifaddr *ifp)
448{
449 return refcount_inc_not_zero(&ifp->refcnt);
450}
451
452/*
453 * compute link-local solicited-node multicast address
454 */
455
456static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
457 struct in6_addr *solicited)
458{
459 ipv6_addr_set(solicited,
460 htonl(0xFF020000), 0,
461 htonl(0x1),
462 htonl(0xFF000000) | addr->s6_addr32[3]);
463}
464
465static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
466{
467#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
468 __be64 *p = (__force __be64 *)addr;
469 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
470#else
471 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
472 addr->s6_addr32[1] | addr->s6_addr32[2] |
473 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
474#endif
475}
476
477static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
478{
479#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
480 __be64 *p = (__force __be64 *)addr;
481 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
482#else
483 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
484 addr->s6_addr32[1] | addr->s6_addr32[2] |
485 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
486#endif
487}
488
489static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
490{
491 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
492}
493
494static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
495{
496#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
497 __be64 *p = (__force __be64 *)addr;
498 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
499 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
500 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
501#else
502 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
503 addr->s6_addr32[1] |
504 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
505 (addr->s6_addr[12] ^ 0xff)) == 0;
506#endif
507}
508
509static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
510{
511#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
512 __be64 *p = (__force __be64 *)addr;
513
514 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
515 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
516#else
517 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
518 addr->s6_addr32[1] | addr->s6_addr32[2] |
519 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
520#endif
521}
522
523#ifdef CONFIG_PROC_FS
524int if6_proc_init(void);
525void if6_proc_exit(void);
526#endif
527
528#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 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/netdevice.h>
53#include <net/if_inet6.h>
54#include <net/ipv6.h>
55
56struct in6_validator_info {
57 struct in6_addr i6vi_addr;
58 struct inet6_dev *i6vi_dev;
59 struct netlink_ext_ack *extack;
60};
61
62int addrconf_init(void);
63void addrconf_cleanup(void);
64
65int addrconf_add_ifaddr(struct net *net, void __user *arg);
66int addrconf_del_ifaddr(struct net *net, void __user *arg);
67int addrconf_set_dstaddr(struct net *net, void __user *arg);
68
69int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
70 const struct net_device *dev, int strict);
71int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
72 const struct net_device *dev, bool skip_dev_check,
73 int strict, u32 banned_flags);
74
75#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
76int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
77#endif
78
79bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
80 const unsigned int prefix_len,
81 struct net_device *dev);
82
83int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
84
85struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
86 const struct in6_addr *addr,
87 struct net_device *dev, int strict);
88
89int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
90 const struct in6_addr *daddr, unsigned int srcprefs,
91 struct in6_addr *saddr);
92int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
93 u32 banned_flags);
94int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
95 u32 banned_flags);
96bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
97 bool match_wildcard);
98void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
99void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
100
101void addrconf_add_linklocal(struct inet6_dev *idev,
102 const struct in6_addr *addr, u32 flags);
103
104int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
105 const struct prefix_info *pinfo,
106 struct inet6_dev *in6_dev,
107 const struct in6_addr *addr, int addr_type,
108 u32 addr_flags, bool sllao, bool tokenized,
109 __u32 valid_lft, u32 prefered_lft);
110
111static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
112{
113 memcpy(eui, addr, 3);
114 eui[3] = 0xFF;
115 eui[4] = 0xFE;
116 memcpy(eui + 5, addr + 3, 3);
117}
118
119static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
120{
121 addrconf_addr_eui48_base(eui, addr);
122 eui[0] ^= 2;
123}
124
125static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
126{
127 if (dev->addr_len != ETH_ALEN)
128 return -1;
129
130 /*
131 * The zSeries OSA network cards can be shared among various
132 * OS instances, but the OSA cards have only one MAC address.
133 * This leads to duplicate address conflicts in conjunction
134 * with IPv6 if more than one instance uses the same card.
135 *
136 * The driver for these cards can deliver a unique 16-bit
137 * identifier for each instance sharing the same card. It is
138 * placed instead of 0xFFFE in the interface identifier. The
139 * "u" bit of the interface identifier is not inverted in this
140 * case. Hence the resulting interface identifier has local
141 * scope according to RFC2373.
142 */
143
144 addrconf_addr_eui48_base(eui, dev->dev_addr);
145
146 if (dev->dev_id) {
147 eui[3] = (dev->dev_id >> 8) & 0xFF;
148 eui[4] = dev->dev_id & 0xFF;
149 } else {
150 eui[0] ^= 2;
151 }
152
153 return 0;
154}
155
156static inline unsigned long addrconf_timeout_fixup(u32 timeout,
157 unsigned int unit)
158{
159 if (timeout == 0xffffffff)
160 return ~0UL;
161
162 /*
163 * Avoid arithmetic overflow.
164 * Assuming unit is constant and non-zero, this "if" statement
165 * will go away on 64bit archs.
166 */
167 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
168 return LONG_MAX / unit;
169
170 return timeout;
171}
172
173static inline int addrconf_finite_timeout(unsigned long timeout)
174{
175 return ~timeout;
176}
177
178/*
179 * IPv6 Address Label subsystem (addrlabel.c)
180 */
181int ipv6_addr_label_init(void);
182void ipv6_addr_label_cleanup(void);
183int ipv6_addr_label_rtnl_register(void);
184u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
185 int type, int ifindex);
186
187/*
188 * multicast prototypes (mcast.c)
189 */
190int ipv6_sock_mc_join(struct sock *sk, int ifindex,
191 const struct in6_addr *addr);
192int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
193 const struct in6_addr *addr);
194void __ipv6_sock_mc_close(struct sock *sk);
195void ipv6_sock_mc_close(struct sock *sk);
196bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
197 const struct in6_addr *src_addr);
198
199int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
200int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
201int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
202void ipv6_mc_up(struct inet6_dev *idev);
203void ipv6_mc_down(struct inet6_dev *idev);
204void ipv6_mc_unmap(struct inet6_dev *idev);
205void ipv6_mc_remap(struct inet6_dev *idev);
206void ipv6_mc_init_dev(struct inet6_dev *idev);
207void ipv6_mc_destroy_dev(struct inet6_dev *idev);
208int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
209void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
210
211bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
212 const struct in6_addr *src_addr);
213
214void ipv6_mc_dad_complete(struct inet6_dev *idev);
215
216/* A stub used by vxlan module. This is ugly, ideally these
217 * symbols should be built into the core kernel.
218 */
219struct ipv6_stub {
220 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
221 const struct in6_addr *addr);
222 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
223 const struct in6_addr *addr);
224 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
225 struct dst_entry **dst, struct flowi6 *fl6);
226 void (*udpv6_encap_enable)(void);
227 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
228 const struct in6_addr *solicited_addr,
229 bool router, bool solicited, bool override, bool inc_opt);
230 struct neigh_table *nd_tbl;
231};
232extern const struct ipv6_stub *ipv6_stub __read_mostly;
233
234/* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
235struct ipv6_bpf_stub {
236 int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len,
237 bool force_bind_address_no_port, bool with_lock);
238};
239extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
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);
285
286/* Device notifier */
287int register_inet6addr_notifier(struct notifier_block *nb);
288int unregister_inet6addr_notifier(struct notifier_block *nb);
289int inet6addr_notifier_call_chain(unsigned long val, void *v);
290
291int register_inet6addr_validator_notifier(struct notifier_block *nb);
292int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
293int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
294
295void inet6_netconf_notify_devconf(struct net *net, int event, int type,
296 int ifindex, struct ipv6_devconf *devconf);
297
298/**
299 * __in6_dev_get - get inet6_dev pointer from netdevice
300 * @dev: network device
301 *
302 * Caller must hold rcu_read_lock or RTNL, because this function
303 * does not take a reference on the inet6_dev.
304 */
305static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
306{
307 return rcu_dereference_rtnl(dev->ip6_ptr);
308}
309
310/**
311 * in6_dev_get - get inet6_dev pointer from netdevice
312 * @dev: network device
313 *
314 * This version can be used in any context, and takes a reference
315 * on the inet6_dev. Callers must use in6_dev_put() later to
316 * release this reference.
317 */
318static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
319{
320 struct inet6_dev *idev;
321
322 rcu_read_lock();
323 idev = rcu_dereference(dev->ip6_ptr);
324 if (idev)
325 refcount_inc(&idev->refcnt);
326 rcu_read_unlock();
327 return idev;
328}
329
330static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
331{
332 struct inet6_dev *idev = __in6_dev_get(dev);
333
334 return idev ? idev->nd_parms : NULL;
335}
336
337void in6_dev_finish_destroy(struct inet6_dev *idev);
338
339static inline void in6_dev_put(struct inet6_dev *idev)
340{
341 if (refcount_dec_and_test(&idev->refcnt))
342 in6_dev_finish_destroy(idev);
343}
344
345static inline void in6_dev_put_clear(struct inet6_dev **pidev)
346{
347 struct inet6_dev *idev = *pidev;
348
349 if (idev) {
350 in6_dev_put(idev);
351 *pidev = NULL;
352 }
353}
354
355static inline void __in6_dev_put(struct inet6_dev *idev)
356{
357 refcount_dec(&idev->refcnt);
358}
359
360static inline void in6_dev_hold(struct inet6_dev *idev)
361{
362 refcount_inc(&idev->refcnt);
363}
364
365void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
366
367static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
368{
369 if (refcount_dec_and_test(&ifp->refcnt))
370 inet6_ifa_finish_destroy(ifp);
371}
372
373static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
374{
375 refcount_dec(&ifp->refcnt);
376}
377
378static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
379{
380 refcount_inc(&ifp->refcnt);
381}
382
383
384/*
385 * compute link-local solicited-node multicast address
386 */
387
388static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
389 struct in6_addr *solicited)
390{
391 ipv6_addr_set(solicited,
392 htonl(0xFF020000), 0,
393 htonl(0x1),
394 htonl(0xFF000000) | addr->s6_addr32[3]);
395}
396
397static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
398{
399#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
400 __be64 *p = (__be64 *)addr;
401 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
402#else
403 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
404 addr->s6_addr32[1] | addr->s6_addr32[2] |
405 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
406#endif
407}
408
409static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
410{
411#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
412 __be64 *p = (__be64 *)addr;
413 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
414#else
415 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
416 addr->s6_addr32[1] | addr->s6_addr32[2] |
417 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
418#endif
419}
420
421static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
422{
423 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
424}
425
426static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
427{
428#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
429 __be64 *p = (__be64 *)addr;
430 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
431 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
432 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
433#else
434 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
435 addr->s6_addr32[1] |
436 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
437 (addr->s6_addr[12] ^ 0xff)) == 0;
438#endif
439}
440
441#ifdef CONFIG_PROC_FS
442int if6_proc_init(void);
443void if6_proc_exit(void);
444#endif
445
446#endif