tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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 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#define ADDRCONF_NOTIFY_PRIORITY 0
23
24#include <linux/in.h>
25#include <linux/in6.h>
26
27struct prefix_info {
28 __u8 type;
29 __u8 length;
30 __u8 prefix_len;
31
32#if defined(__BIG_ENDIAN_BITFIELD)
33 __u8 onlink : 1,
34 autoconf : 1,
35 reserved : 6;
36#elif defined(__LITTLE_ENDIAN_BITFIELD)
37 __u8 reserved : 6,
38 autoconf : 1,
39 onlink : 1;
40#else
41#error "Please fix <asm/byteorder.h>"
42#endif
43 __be32 valid;
44 __be32 prefered;
45 __be32 reserved2;
46
47 struct in6_addr prefix;
48};
49
50#include <linux/ipv6.h>
51#include <linux/netdevice.h>
52#include <net/if_inet6.h>
53#include <net/ipv6.h>
54
55struct in6_validator_info {
56 struct in6_addr i6vi_addr;
57 struct inet6_dev *i6vi_dev;
58 struct netlink_ext_ack *extack;
59};
60
61struct ifa6_config {
62 const struct in6_addr *pfx;
63 unsigned int plen;
64
65 const struct in6_addr *peer_pfx;
66
67 u32 rt_priority;
68 u32 ifa_flags;
69 u32 preferred_lft;
70 u32 valid_lft;
71 u16 scope;
72};
73
74int addrconf_init(void);
75void addrconf_cleanup(void);
76
77int addrconf_add_ifaddr(struct net *net, void __user *arg);
78int addrconf_del_ifaddr(struct net *net, void __user *arg);
79int addrconf_set_dstaddr(struct net *net, void __user *arg);
80
81int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
82 const struct net_device *dev, int strict);
83int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
84 const struct net_device *dev, bool skip_dev_check,
85 int strict, u32 banned_flags);
86
87#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
88int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
89#endif
90
91int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
92 unsigned char nsegs);
93
94bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
95 const unsigned int prefix_len,
96 struct net_device *dev);
97
98int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
99
100struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
101 const struct in6_addr *addr,
102 struct net_device *dev, int strict);
103
104int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
105 const struct in6_addr *daddr, unsigned int srcprefs,
106 struct in6_addr *saddr);
107int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
108 u32 banned_flags);
109int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
110 u32 banned_flags);
111bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
112 bool match_wildcard);
113bool inet_rcv_saddr_any(const struct sock *sk);
114void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
115void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
116
117void addrconf_add_linklocal(struct inet6_dev *idev,
118 const struct in6_addr *addr, u32 flags);
119
120int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
121 const struct prefix_info *pinfo,
122 struct inet6_dev *in6_dev,
123 const struct in6_addr *addr, int addr_type,
124 u32 addr_flags, bool sllao, bool tokenized,
125 __u32 valid_lft, u32 prefered_lft);
126
127static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
128{
129 memcpy(eui, addr, 3);
130 eui[3] = 0xFF;
131 eui[4] = 0xFE;
132 memcpy(eui + 5, addr + 3, 3);
133}
134
135static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
136{
137 addrconf_addr_eui48_base(eui, addr);
138 eui[0] ^= 2;
139}
140
141static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
142{
143 if (dev->addr_len != ETH_ALEN)
144 return -1;
145
146 /*
147 * The zSeries OSA network cards can be shared among various
148 * OS instances, but the OSA cards have only one MAC address.
149 * This leads to duplicate address conflicts in conjunction
150 * with IPv6 if more than one instance uses the same card.
151 *
152 * The driver for these cards can deliver a unique 16-bit
153 * identifier for each instance sharing the same card. It is
154 * placed instead of 0xFFFE in the interface identifier. The
155 * "u" bit of the interface identifier is not inverted in this
156 * case. Hence the resulting interface identifier has local
157 * scope according to RFC2373.
158 */
159
160 addrconf_addr_eui48_base(eui, dev->dev_addr);
161
162 if (dev->dev_id) {
163 eui[3] = (dev->dev_id >> 8) & 0xFF;
164 eui[4] = dev->dev_id & 0xFF;
165 } else {
166 eui[0] ^= 2;
167 }
168
169 return 0;
170}
171
172static inline unsigned long addrconf_timeout_fixup(u32 timeout,
173 unsigned int unit)
174{
175 if (timeout == 0xffffffff)
176 return ~0UL;
177
178 /*
179 * Avoid arithmetic overflow.
180 * Assuming unit is constant and non-zero, this "if" statement
181 * will go away on 64bit archs.
182 */
183 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
184 return LONG_MAX / unit;
185
186 return timeout;
187}
188
189static inline int addrconf_finite_timeout(unsigned long timeout)
190{
191 return ~timeout;
192}
193
194/*
195 * IPv6 Address Label subsystem (addrlabel.c)
196 */
197int ipv6_addr_label_init(void);
198void ipv6_addr_label_cleanup(void);
199int ipv6_addr_label_rtnl_register(void);
200u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
201 int type, int ifindex);
202
203/*
204 * multicast prototypes (mcast.c)
205 */
206static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
207 unsigned int len)
208{
209 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
210 return false;
211
212 return pskb_may_pull(skb, len);
213}
214
215int ipv6_sock_mc_join(struct sock *sk, int ifindex,
216 const struct in6_addr *addr);
217int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
218 const struct in6_addr *addr);
219void __ipv6_sock_mc_close(struct sock *sk);
220void ipv6_sock_mc_close(struct sock *sk);
221bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
222 const struct in6_addr *src_addr);
223
224int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
225int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
226int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
227void ipv6_mc_up(struct inet6_dev *idev);
228void ipv6_mc_down(struct inet6_dev *idev);
229void ipv6_mc_unmap(struct inet6_dev *idev);
230void ipv6_mc_remap(struct inet6_dev *idev);
231void ipv6_mc_init_dev(struct inet6_dev *idev);
232void ipv6_mc_destroy_dev(struct inet6_dev *idev);
233int ipv6_mc_check_icmpv6(struct sk_buff *skb);
234int ipv6_mc_check_mld(struct sk_buff *skb);
235void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
236
237bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
238 const struct in6_addr *src_addr);
239
240void ipv6_mc_dad_complete(struct inet6_dev *idev);
241
242/*
243 * identify MLD packets for MLD filter exceptions
244 */
245static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
246{
247 struct icmp6hdr *hdr;
248
249 if (nexthdr != IPPROTO_ICMPV6 ||
250 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
251 return false;
252
253 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
254
255 switch (hdr->icmp6_type) {
256 case ICMPV6_MGM_QUERY:
257 case ICMPV6_MGM_REPORT:
258 case ICMPV6_MGM_REDUCTION:
259 case ICMPV6_MLD2_REPORT:
260 return true;
261 default:
262 break;
263 }
264 return false;
265}
266
267void addrconf_prefix_rcv(struct net_device *dev,
268 u8 *opt, int len, bool sllao);
269
270/*
271 * anycast prototypes (anycast.c)
272 */
273int ipv6_sock_ac_join(struct sock *sk, int ifindex,
274 const struct in6_addr *addr);
275int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
276 const struct in6_addr *addr);
277void ipv6_sock_ac_close(struct sock *sk);
278
279int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
280int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
281void ipv6_ac_destroy_dev(struct inet6_dev *idev);
282bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
283 const struct in6_addr *addr);
284bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
285 const struct in6_addr *addr);
286int ipv6_anycast_init(void);
287void ipv6_anycast_cleanup(void);
288
289/* Device notifier */
290int register_inet6addr_notifier(struct notifier_block *nb);
291int unregister_inet6addr_notifier(struct notifier_block *nb);
292int inet6addr_notifier_call_chain(unsigned long val, void *v);
293
294int register_inet6addr_validator_notifier(struct notifier_block *nb);
295int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
296int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
297
298void inet6_netconf_notify_devconf(struct net *net, int event, int type,
299 int ifindex, struct ipv6_devconf *devconf);
300
301/**
302 * __in6_dev_get - get inet6_dev pointer from netdevice
303 * @dev: network device
304 *
305 * Caller must hold rcu_read_lock or RTNL, because this function
306 * does not take a reference on the inet6_dev.
307 */
308static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
309{
310 return rcu_dereference_rtnl(dev->ip6_ptr);
311}
312
313/**
314 * __in6_dev_stats_get - get inet6_dev pointer for stats
315 * @dev: network device
316 * @skb: skb for original incoming interface if neeeded
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_stats_get(const struct net_device *dev,
322 const struct sk_buff *skb)
323{
324 if (netif_is_l3_master(dev))
325 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
326 return __in6_dev_get(dev);
327}
328
329/**
330 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
331 * @dev: network device
332 *
333 * This is a safer version of __in6_dev_get
334 */
335static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
336{
337 if (likely(dev))
338 return rcu_dereference_rtnl(dev->ip6_ptr);
339 else
340 return NULL;
341}
342
343/**
344 * in6_dev_get - get inet6_dev pointer from netdevice
345 * @dev: network device
346 *
347 * This version can be used in any context, and takes a reference
348 * on the inet6_dev. Callers must use in6_dev_put() later to
349 * release this reference.
350 */
351static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
352{
353 struct inet6_dev *idev;
354
355 rcu_read_lock();
356 idev = rcu_dereference(dev->ip6_ptr);
357 if (idev)
358 refcount_inc(&idev->refcnt);
359 rcu_read_unlock();
360 return idev;
361}
362
363static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
364{
365 struct inet6_dev *idev = __in6_dev_get(dev);
366
367 return idev ? idev->nd_parms : NULL;
368}
369
370void in6_dev_finish_destroy(struct inet6_dev *idev);
371
372static inline void in6_dev_put(struct inet6_dev *idev)
373{
374 if (refcount_dec_and_test(&idev->refcnt))
375 in6_dev_finish_destroy(idev);
376}
377
378static inline void in6_dev_put_clear(struct inet6_dev **pidev)
379{
380 struct inet6_dev *idev = *pidev;
381
382 if (idev) {
383 in6_dev_put(idev);
384 *pidev = NULL;
385 }
386}
387
388static inline void __in6_dev_put(struct inet6_dev *idev)
389{
390 refcount_dec(&idev->refcnt);
391}
392
393static inline void in6_dev_hold(struct inet6_dev *idev)
394{
395 refcount_inc(&idev->refcnt);
396}
397
398/* called with rcu_read_lock held */
399static inline bool ip6_ignore_linkdown(const struct net_device *dev)
400{
401 const struct inet6_dev *idev = __in6_dev_get(dev);
402
403 return !!idev->cnf.ignore_routes_with_linkdown;
404}
405
406void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
407
408static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
409{
410 if (refcount_dec_and_test(&ifp->refcnt))
411 inet6_ifa_finish_destroy(ifp);
412}
413
414static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
415{
416 refcount_dec(&ifp->refcnt);
417}
418
419static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
420{
421 refcount_inc(&ifp->refcnt);
422}
423
424
425/*
426 * compute link-local solicited-node multicast address
427 */
428
429static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
430 struct in6_addr *solicited)
431{
432 ipv6_addr_set(solicited,
433 htonl(0xFF020000), 0,
434 htonl(0x1),
435 htonl(0xFF000000) | addr->s6_addr32[3]);
436}
437
438static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
439{
440#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
441 __be64 *p = (__force __be64 *)addr;
442 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
443#else
444 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
445 addr->s6_addr32[1] | addr->s6_addr32[2] |
446 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
447#endif
448}
449
450static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
451{
452#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
453 __be64 *p = (__force __be64 *)addr;
454 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
455#else
456 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
457 addr->s6_addr32[1] | addr->s6_addr32[2] |
458 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
459#endif
460}
461
462static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
463{
464 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
465}
466
467static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
468{
469#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
470 __be64 *p = (__force __be64 *)addr;
471 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
472 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
473 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
474#else
475 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
476 addr->s6_addr32[1] |
477 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
478 (addr->s6_addr[12] ^ 0xff)) == 0;
479#endif
480}
481
482static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
483{
484#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
485 __be64 *p = (__force __be64 *)addr;
486
487 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
488 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
489#else
490 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
491 addr->s6_addr32[1] | addr->s6_addr32[2] |
492 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
493#endif
494}
495
496#ifdef CONFIG_PROC_FS
497int if6_proc_init(void);
498void if6_proc_exit(void);
499#endif
500
501#endif