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