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1#ifndef _ADDRCONF_H
2#define _ADDRCONF_H
3
4#define MAX_RTR_SOLICITATIONS 3
5#define RTR_SOLICITATION_INTERVAL (4*HZ)
6
7#define MIN_VALID_LIFETIME (2*3600) /* 2 hours */
8
9#define TEMP_VALID_LIFETIME (7*86400)
10#define TEMP_PREFERRED_LIFETIME (86400)
11#define REGEN_MAX_RETRY (3)
12#define MAX_DESYNC_FACTOR (600)
13
14#define ADDR_CHECK_FREQUENCY (120*HZ)
15
16#define IPV6_MAX_ADDRESSES 16
17
18#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
19#define ADDRCONF_TIMER_FUZZ (HZ / 4)
20#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
21
22#include <linux/in.h>
23#include <linux/in6.h>
24
25struct prefix_info {
26 __u8 type;
27 __u8 length;
28 __u8 prefix_len;
29
30#if defined(__BIG_ENDIAN_BITFIELD)
31 __u8 onlink : 1,
32 autoconf : 1,
33 reserved : 6;
34#elif defined(__LITTLE_ENDIAN_BITFIELD)
35 __u8 reserved : 6,
36 autoconf : 1,
37 onlink : 1;
38#else
39#error "Please fix <asm/byteorder.h>"
40#endif
41 __be32 valid;
42 __be32 prefered;
43 __be32 reserved2;
44
45 struct in6_addr prefix;
46};
47
48
49#include <linux/netdevice.h>
50#include <net/if_inet6.h>
51#include <net/ipv6.h>
52
53#define IN6_ADDR_HSIZE_SHIFT 4
54#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
55
56int addrconf_init(void);
57void addrconf_cleanup(void);
58
59int addrconf_add_ifaddr(struct net *net, void __user *arg);
60int addrconf_del_ifaddr(struct net *net, void __user *arg);
61int addrconf_set_dstaddr(struct net *net, void __user *arg);
62
63int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
64 const struct net_device *dev, int strict);
65int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
66 const struct net_device *dev, int strict,
67 u32 banned_flags);
68
69#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
70int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
71#endif
72
73bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
74 const unsigned int prefix_len,
75 struct net_device *dev);
76
77int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
78
79struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
80 const struct in6_addr *addr,
81 struct net_device *dev, int strict);
82
83int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
84 const struct in6_addr *daddr, unsigned int srcprefs,
85 struct in6_addr *saddr);
86int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
87 u32 banned_flags);
88int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
89 u32 banned_flags);
90int ipv4_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
91 bool match_wildcard);
92int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
93 bool match_wildcard);
94void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
95void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
96
97static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
98{
99 if (dev->addr_len != ETH_ALEN)
100 return -1;
101 memcpy(eui, dev->dev_addr, 3);
102 memcpy(eui + 5, dev->dev_addr + 3, 3);
103
104 /*
105 * The zSeries OSA network cards can be shared among various
106 * OS instances, but the OSA cards have only one MAC address.
107 * This leads to duplicate address conflicts in conjunction
108 * with IPv6 if more than one instance uses the same card.
109 *
110 * The driver for these cards can deliver a unique 16-bit
111 * identifier for each instance sharing the same card. It is
112 * placed instead of 0xFFFE in the interface identifier. The
113 * "u" bit of the interface identifier is not inverted in this
114 * case. Hence the resulting interface identifier has local
115 * scope according to RFC2373.
116 */
117 if (dev->dev_id) {
118 eui[3] = (dev->dev_id >> 8) & 0xFF;
119 eui[4] = dev->dev_id & 0xFF;
120 } else {
121 eui[3] = 0xFF;
122 eui[4] = 0xFE;
123 eui[0] ^= 2;
124 }
125 return 0;
126}
127
128static inline unsigned long addrconf_timeout_fixup(u32 timeout,
129 unsigned int unit)
130{
131 if (timeout == 0xffffffff)
132 return ~0UL;
133
134 /*
135 * Avoid arithmetic overflow.
136 * Assuming unit is constant and non-zero, this "if" statement
137 * will go away on 64bit archs.
138 */
139 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
140 return LONG_MAX / unit;
141
142 return timeout;
143}
144
145static inline int addrconf_finite_timeout(unsigned long timeout)
146{
147 return ~timeout;
148}
149
150/*
151 * IPv6 Address Label subsystem (addrlabel.c)
152 */
153int ipv6_addr_label_init(void);
154void ipv6_addr_label_cleanup(void);
155void ipv6_addr_label_rtnl_register(void);
156u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
157 int type, int ifindex);
158
159/*
160 * multicast prototypes (mcast.c)
161 */
162int ipv6_sock_mc_join(struct sock *sk, int ifindex,
163 const struct in6_addr *addr);
164int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
165 const struct in6_addr *addr);
166void ipv6_sock_mc_close(struct sock *sk);
167bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
168 const struct in6_addr *src_addr);
169
170int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
171int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
172int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
173void ipv6_mc_up(struct inet6_dev *idev);
174void ipv6_mc_down(struct inet6_dev *idev);
175void ipv6_mc_unmap(struct inet6_dev *idev);
176void ipv6_mc_remap(struct inet6_dev *idev);
177void ipv6_mc_init_dev(struct inet6_dev *idev);
178void ipv6_mc_destroy_dev(struct inet6_dev *idev);
179int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
180void addrconf_dad_failure(struct inet6_ifaddr *ifp);
181
182bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
183 const struct in6_addr *src_addr);
184
185void ipv6_mc_dad_complete(struct inet6_dev *idev);
186
187/* A stub used by vxlan module. This is ugly, ideally these
188 * symbols should be built into the core kernel.
189 */
190struct ipv6_stub {
191 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
192 const struct in6_addr *addr);
193 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
194 const struct in6_addr *addr);
195 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
196 struct dst_entry **dst, struct flowi6 *fl6);
197 void (*udpv6_encap_enable)(void);
198 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
199 const struct in6_addr *solicited_addr,
200 bool router, bool solicited, bool override, bool inc_opt);
201 struct neigh_table *nd_tbl;
202};
203extern const struct ipv6_stub *ipv6_stub __read_mostly;
204
205/*
206 * identify MLD packets for MLD filter exceptions
207 */
208static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
209{
210 struct icmp6hdr *hdr;
211
212 if (nexthdr != IPPROTO_ICMPV6 ||
213 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
214 return false;
215
216 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
217
218 switch (hdr->icmp6_type) {
219 case ICMPV6_MGM_QUERY:
220 case ICMPV6_MGM_REPORT:
221 case ICMPV6_MGM_REDUCTION:
222 case ICMPV6_MLD2_REPORT:
223 return true;
224 default:
225 break;
226 }
227 return false;
228}
229
230void addrconf_prefix_rcv(struct net_device *dev,
231 u8 *opt, int len, bool sllao);
232
233/*
234 * anycast prototypes (anycast.c)
235 */
236int ipv6_sock_ac_join(struct sock *sk, int ifindex,
237 const struct in6_addr *addr);
238int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
239 const struct in6_addr *addr);
240void ipv6_sock_ac_close(struct sock *sk);
241
242int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
243int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
244void ipv6_ac_destroy_dev(struct inet6_dev *idev);
245bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
246 const struct in6_addr *addr);
247bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
248 const struct in6_addr *addr);
249
250/* Device notifier */
251int register_inet6addr_notifier(struct notifier_block *nb);
252int unregister_inet6addr_notifier(struct notifier_block *nb);
253int inet6addr_notifier_call_chain(unsigned long val, void *v);
254
255void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
256 struct ipv6_devconf *devconf);
257
258/**
259 * __in6_dev_get - get inet6_dev pointer from netdevice
260 * @dev: network device
261 *
262 * Caller must hold rcu_read_lock or RTNL, because this function
263 * does not take a reference on the inet6_dev.
264 */
265static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
266{
267 return rcu_dereference_rtnl(dev->ip6_ptr);
268}
269
270/**
271 * in6_dev_get - get inet6_dev pointer from netdevice
272 * @dev: network device
273 *
274 * This version can be used in any context, and takes a reference
275 * on the inet6_dev. Callers must use in6_dev_put() later to
276 * release this reference.
277 */
278static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
279{
280 struct inet6_dev *idev;
281
282 rcu_read_lock();
283 idev = rcu_dereference(dev->ip6_ptr);
284 if (idev)
285 atomic_inc(&idev->refcnt);
286 rcu_read_unlock();
287 return idev;
288}
289
290static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
291{
292 struct inet6_dev *idev = __in6_dev_get(dev);
293
294 return idev ? idev->nd_parms : NULL;
295}
296
297void in6_dev_finish_destroy(struct inet6_dev *idev);
298
299static inline void in6_dev_put(struct inet6_dev *idev)
300{
301 if (atomic_dec_and_test(&idev->refcnt))
302 in6_dev_finish_destroy(idev);
303}
304
305static inline void __in6_dev_put(struct inet6_dev *idev)
306{
307 atomic_dec(&idev->refcnt);
308}
309
310static inline void in6_dev_hold(struct inet6_dev *idev)
311{
312 atomic_inc(&idev->refcnt);
313}
314
315void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
316
317static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
318{
319 if (atomic_dec_and_test(&ifp->refcnt))
320 inet6_ifa_finish_destroy(ifp);
321}
322
323static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
324{
325 atomic_dec(&ifp->refcnt);
326}
327
328static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
329{
330 atomic_inc(&ifp->refcnt);
331}
332
333
334/*
335 * compute link-local solicited-node multicast address
336 */
337
338static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
339 struct in6_addr *solicited)
340{
341 ipv6_addr_set(solicited,
342 htonl(0xFF020000), 0,
343 htonl(0x1),
344 htonl(0xFF000000) | addr->s6_addr32[3]);
345}
346
347static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
348{
349#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
350 __be64 *p = (__be64 *)addr;
351 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
352#else
353 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
354 addr->s6_addr32[1] | addr->s6_addr32[2] |
355 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
356#endif
357}
358
359static inline bool ipv6_addr_is_ll_all_routers(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(2))) == 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(0x00000002))) == 0;
368#endif
369}
370
371static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
372{
373 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
374}
375
376static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
377{
378#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
379 __be64 *p = (__be64 *)addr;
380 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
381 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
382 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
383#else
384 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
385 addr->s6_addr32[1] |
386 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
387 (addr->s6_addr[12] ^ 0xff)) == 0;
388#endif
389}
390
391#ifdef CONFIG_PROC_FS
392int if6_proc_init(void);
393void if6_proc_exit(void);
394#endif
395
396#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