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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/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
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 reserved : 6;
42#elif defined(__LITTLE_ENDIAN_BITFIELD)
43 __u8 reserved : 6,
44 autoconf : 1,
45 onlink : 1;
46#else
47#error "Please fix <asm/byteorder.h>"
48#endif
49 };
50 };
51 __be32 valid;
52 __be32 prefered;
53 __be32 reserved2;
54
55 struct in6_addr prefix;
56};
57
58/* rfc4861 4.6.2: IPv6 PIO is 32 bytes in size */
59static_assert(sizeof(struct prefix_info) == 32);
60
61#include <linux/ipv6.h>
62#include <linux/netdevice.h>
63#include <net/if_inet6.h>
64#include <net/ipv6.h>
65
66struct in6_validator_info {
67 struct in6_addr i6vi_addr;
68 struct inet6_dev *i6vi_dev;
69 struct netlink_ext_ack *extack;
70};
71
72struct ifa6_config {
73 const struct in6_addr *pfx;
74 unsigned int plen;
75
76 u8 ifa_proto;
77
78 const struct in6_addr *peer_pfx;
79
80 u32 rt_priority;
81 u32 ifa_flags;
82 u32 preferred_lft;
83 u32 valid_lft;
84 u16 scope;
85};
86
87int addrconf_init(void);
88void addrconf_cleanup(void);
89
90int addrconf_add_ifaddr(struct net *net, void __user *arg);
91int addrconf_del_ifaddr(struct net *net, void __user *arg);
92int addrconf_set_dstaddr(struct net *net, void __user *arg);
93
94int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
95 const struct net_device *dev, int strict);
96int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
97 const struct net_device *dev, bool skip_dev_check,
98 int strict, u32 banned_flags);
99
100#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
101int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
102#endif
103
104int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
105 unsigned char nsegs);
106
107bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
108 const unsigned int prefix_len,
109 struct net_device *dev);
110
111int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
112
113struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
114 struct net_device *dev);
115
116struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
117 const struct in6_addr *addr,
118 struct net_device *dev, int strict);
119
120int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
121 const struct in6_addr *daddr, unsigned int srcprefs,
122 struct in6_addr *saddr);
123int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
124 u32 banned_flags);
125bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
126 bool match_wildcard);
127bool inet_rcv_saddr_any(const struct sock *sk);
128void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
129void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
130
131void addrconf_add_linklocal(struct inet6_dev *idev,
132 const struct in6_addr *addr, u32 flags);
133
134int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
135 const struct prefix_info *pinfo,
136 struct inet6_dev *in6_dev,
137 const struct in6_addr *addr, int addr_type,
138 u32 addr_flags, bool sllao, bool tokenized,
139 __u32 valid_lft, u32 prefered_lft);
140
141static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
142{
143 memcpy(eui, addr, 3);
144 eui[3] = 0xFF;
145 eui[4] = 0xFE;
146 memcpy(eui + 5, addr + 3, 3);
147}
148
149static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
150{
151 addrconf_addr_eui48_base(eui, addr);
152 eui[0] ^= 2;
153}
154
155static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
156{
157 if (dev->addr_len != ETH_ALEN)
158 return -1;
159
160 /*
161 * The zSeries OSA network cards can be shared among various
162 * OS instances, but the OSA cards have only one MAC address.
163 * This leads to duplicate address conflicts in conjunction
164 * with IPv6 if more than one instance uses the same card.
165 *
166 * The driver for these cards can deliver a unique 16-bit
167 * identifier for each instance sharing the same card. It is
168 * placed instead of 0xFFFE in the interface identifier. The
169 * "u" bit of the interface identifier is not inverted in this
170 * case. Hence the resulting interface identifier has local
171 * scope according to RFC2373.
172 */
173
174 addrconf_addr_eui48_base(eui, dev->dev_addr);
175
176 if (dev->dev_id) {
177 eui[3] = (dev->dev_id >> 8) & 0xFF;
178 eui[4] = dev->dev_id & 0xFF;
179 } else {
180 eui[0] ^= 2;
181 }
182
183 return 0;
184}
185
186static inline unsigned long addrconf_timeout_fixup(u32 timeout,
187 unsigned int unit)
188{
189 if (timeout == 0xffffffff)
190 return ~0UL;
191
192 /*
193 * Avoid arithmetic overflow.
194 * Assuming unit is constant and non-zero, this "if" statement
195 * will go away on 64bit archs.
196 */
197 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
198 return LONG_MAX / unit;
199
200 return timeout;
201}
202
203static inline int addrconf_finite_timeout(unsigned long timeout)
204{
205 return ~timeout;
206}
207
208/*
209 * IPv6 Address Label subsystem (addrlabel.c)
210 */
211int ipv6_addr_label_init(void);
212void ipv6_addr_label_cleanup(void);
213int ipv6_addr_label_rtnl_register(void);
214u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
215 int type, int ifindex);
216
217/*
218 * multicast prototypes (mcast.c)
219 */
220static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
221 unsigned int len)
222{
223 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
224 return false;
225
226 return pskb_may_pull(skb, len);
227}
228
229int ipv6_sock_mc_join(struct sock *sk, int ifindex,
230 const struct in6_addr *addr);
231int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
232 const struct in6_addr *addr);
233void __ipv6_sock_mc_close(struct sock *sk);
234void ipv6_sock_mc_close(struct sock *sk);
235bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr,
236 const struct in6_addr *src_addr);
237
238int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
239int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
240int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
241void ipv6_mc_up(struct inet6_dev *idev);
242void ipv6_mc_down(struct inet6_dev *idev);
243void ipv6_mc_unmap(struct inet6_dev *idev);
244void ipv6_mc_remap(struct inet6_dev *idev);
245void ipv6_mc_init_dev(struct inet6_dev *idev);
246void ipv6_mc_destroy_dev(struct inet6_dev *idev);
247int ipv6_mc_check_mld(struct sk_buff *skb);
248void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
249
250bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
251 const struct in6_addr *src_addr);
252
253void ipv6_mc_dad_complete(struct inet6_dev *idev);
254
255/*
256 * identify MLD packets for MLD filter exceptions
257 */
258static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
259{
260 struct icmp6hdr *hdr;
261
262 if (nexthdr != IPPROTO_ICMPV6 ||
263 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
264 return false;
265
266 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
267
268 switch (hdr->icmp6_type) {
269 case ICMPV6_MGM_QUERY:
270 case ICMPV6_MGM_REPORT:
271 case ICMPV6_MGM_REDUCTION:
272 case ICMPV6_MLD2_REPORT:
273 return true;
274 default:
275 break;
276 }
277 return false;
278}
279
280void addrconf_prefix_rcv(struct net_device *dev,
281 u8 *opt, int len, bool sllao);
282
283/*
284 * anycast prototypes (anycast.c)
285 */
286int ipv6_sock_ac_join(struct sock *sk, int ifindex,
287 const struct in6_addr *addr);
288int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
289 const struct in6_addr *addr);
290void __ipv6_sock_ac_close(struct sock *sk);
291void ipv6_sock_ac_close(struct sock *sk);
292
293int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
294int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
295void ipv6_ac_destroy_dev(struct inet6_dev *idev);
296bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
297 const struct in6_addr *addr);
298bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
299 const struct in6_addr *addr);
300int ipv6_anycast_init(void);
301void ipv6_anycast_cleanup(void);
302
303/* Device notifier */
304int register_inet6addr_notifier(struct notifier_block *nb);
305int unregister_inet6addr_notifier(struct notifier_block *nb);
306int inet6addr_notifier_call_chain(unsigned long val, void *v);
307
308int register_inet6addr_validator_notifier(struct notifier_block *nb);
309int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
310int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
311
312void inet6_netconf_notify_devconf(struct net *net, int event, int type,
313 int ifindex, struct ipv6_devconf *devconf);
314
315/**
316 * __in6_dev_get - get inet6_dev pointer from netdevice
317 * @dev: network device
318 *
319 * Caller must hold rcu_read_lock or RTNL, because this function
320 * does not take a reference on the inet6_dev.
321 */
322static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
323{
324 return rcu_dereference_rtnl(dev->ip6_ptr);
325}
326
327/**
328 * __in6_dev_stats_get - get inet6_dev pointer for stats
329 * @dev: network device
330 * @skb: skb for original incoming interface if neeeded
331 *
332 * Caller must hold rcu_read_lock or RTNL, because this function
333 * does not take a reference on the inet6_dev.
334 */
335static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
336 const struct sk_buff *skb)
337{
338 if (netif_is_l3_master(dev))
339 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
340 return __in6_dev_get(dev);
341}
342
343/**
344 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
345 * @dev: network device
346 *
347 * This is a safer version of __in6_dev_get
348 */
349static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
350{
351 if (likely(dev))
352 return rcu_dereference_rtnl(dev->ip6_ptr);
353 else
354 return NULL;
355}
356
357/**
358 * in6_dev_get - get inet6_dev pointer from netdevice
359 * @dev: network device
360 *
361 * This version can be used in any context, and takes a reference
362 * on the inet6_dev. Callers must use in6_dev_put() later to
363 * release this reference.
364 */
365static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
366{
367 struct inet6_dev *idev;
368
369 rcu_read_lock();
370 idev = rcu_dereference(dev->ip6_ptr);
371 if (idev)
372 refcount_inc(&idev->refcnt);
373 rcu_read_unlock();
374 return idev;
375}
376
377static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
378{
379 struct inet6_dev *idev = __in6_dev_get(dev);
380
381 return idev ? idev->nd_parms : NULL;
382}
383
384void in6_dev_finish_destroy(struct inet6_dev *idev);
385
386static inline void in6_dev_put(struct inet6_dev *idev)
387{
388 if (refcount_dec_and_test(&idev->refcnt))
389 in6_dev_finish_destroy(idev);
390}
391
392static inline void in6_dev_put_clear(struct inet6_dev **pidev)
393{
394 struct inet6_dev *idev = *pidev;
395
396 if (idev) {
397 in6_dev_put(idev);
398 *pidev = NULL;
399 }
400}
401
402static inline void __in6_dev_put(struct inet6_dev *idev)
403{
404 refcount_dec(&idev->refcnt);
405}
406
407static inline void in6_dev_hold(struct inet6_dev *idev)
408{
409 refcount_inc(&idev->refcnt);
410}
411
412/* called with rcu_read_lock held */
413static inline bool ip6_ignore_linkdown(const struct net_device *dev)
414{
415 const struct inet6_dev *idev = __in6_dev_get(dev);
416
417 if (unlikely(!idev))
418 return true;
419
420 return !!READ_ONCE(idev->cnf.ignore_routes_with_linkdown);
421}
422
423void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
424
425static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
426{
427 if (refcount_dec_and_test(&ifp->refcnt))
428 inet6_ifa_finish_destroy(ifp);
429}
430
431static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
432{
433 refcount_dec(&ifp->refcnt);
434}
435
436static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
437{
438 refcount_inc(&ifp->refcnt);
439}
440
441static inline bool in6_ifa_hold_safe(struct inet6_ifaddr *ifp)
442{
443 return refcount_inc_not_zero(&ifp->refcnt);
444}
445
446/*
447 * compute link-local solicited-node multicast address
448 */
449
450static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
451 struct in6_addr *solicited)
452{
453 ipv6_addr_set(solicited,
454 htonl(0xFF020000), 0,
455 htonl(0x1),
456 htonl(0xFF000000) | addr->s6_addr32[3]);
457}
458
459static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
460{
461#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
462 __be64 *p = (__force __be64 *)addr;
463 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
464#else
465 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
466 addr->s6_addr32[1] | addr->s6_addr32[2] |
467 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
468#endif
469}
470
471static inline bool ipv6_addr_is_ll_all_routers(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)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
476#else
477 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
478 addr->s6_addr32[1] | addr->s6_addr32[2] |
479 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
480#endif
481}
482
483static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
484{
485 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
486}
487
488static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
489{
490#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
491 __be64 *p = (__force __be64 *)addr;
492 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
493 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
494 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
495#else
496 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
497 addr->s6_addr32[1] |
498 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
499 (addr->s6_addr[12] ^ 0xff)) == 0;
500#endif
501}
502
503static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
504{
505#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
506 __be64 *p = (__force __be64 *)addr;
507
508 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
509 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
510#else
511 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
512 addr->s6_addr32[1] | addr->s6_addr32[2] |
513 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
514#endif
515}
516
517#ifdef CONFIG_PROC_FS
518int if6_proc_init(void);
519void if6_proc_exit(void);
520#endif
521
522#endif