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TOMOYO Linux Cross Reference
Linux/include/net/addrconf.h

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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 
 29 struct 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/ipv6.h>
 53 #include <linux/netdevice.h>
 54 #include <net/if_inet6.h>
 55 #include <net/ipv6.h>
 56 
 57 struct in6_validator_info {
 58         struct in6_addr         i6vi_addr;
 59         struct inet6_dev        *i6vi_dev;
 60         struct netlink_ext_ack  *extack;
 61 };
 62 
 63 struct ifa6_config {
 64         const struct in6_addr   *pfx;
 65         unsigned int            plen;
 66 
 67         const struct in6_addr   *peer_pfx;
 68 
 69         u32                     rt_priority;
 70         u32                     ifa_flags;
 71         u32                     preferred_lft;
 72         u32                     valid_lft;
 73         u16                     scope;
 74 };
 75 
 76 int addrconf_init(void);
 77 void addrconf_cleanup(void);
 78 
 79 int addrconf_add_ifaddr(struct net *net, void __user *arg);
 80 int addrconf_del_ifaddr(struct net *net, void __user *arg);
 81 int addrconf_set_dstaddr(struct net *net, void __user *arg);
 82 
 83 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
 84                   const struct net_device *dev, int strict);
 85 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
 86                             const struct net_device *dev, bool skip_dev_check,
 87                             int strict, u32 banned_flags);
 88 
 89 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 90 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
 91 #endif
 92 
 93 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
 94                                    const unsigned int prefix_len,
 95                                    struct net_device *dev);
 96 
 97 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
 98 
 99 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
100                                      const struct in6_addr *addr,
101                                      struct net_device *dev, int strict);
102 
103 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
104                        const struct in6_addr *daddr, unsigned int srcprefs,
105                        struct in6_addr *saddr);
106 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
107                       u32 banned_flags);
108 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
109                     u32 banned_flags);
110 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
111                           bool match_wildcard);
112 bool inet_rcv_saddr_any(const struct sock *sk);
113 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
114 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
115 
116 void addrconf_add_linklocal(struct inet6_dev *idev,
117                             const struct in6_addr *addr, u32 flags);
118 
119 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
120                                  const struct prefix_info *pinfo,
121                                  struct inet6_dev *in6_dev,
122                                  const struct in6_addr *addr, int addr_type,
123                                  u32 addr_flags, bool sllao, bool tokenized,
124                                  __u32 valid_lft, u32 prefered_lft);
125 
126 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
127 {
128         memcpy(eui, addr, 3);
129         eui[3] = 0xFF;
130         eui[4] = 0xFE;
131         memcpy(eui + 5, addr + 3, 3);
132 }
133 
134 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
135 {
136         addrconf_addr_eui48_base(eui, addr);
137         eui[0] ^= 2;
138 }
139 
140 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
141 {
142         if (dev->addr_len != ETH_ALEN)
143                 return -1;
144 
145         /*
146          * The zSeries OSA network cards can be shared among various
147          * OS instances, but the OSA cards have only one MAC address.
148          * This leads to duplicate address conflicts in conjunction
149          * with IPv6 if more than one instance uses the same card.
150          *
151          * The driver for these cards can deliver a unique 16-bit
152          * identifier for each instance sharing the same card.  It is
153          * placed instead of 0xFFFE in the interface identifier.  The
154          * "u" bit of the interface identifier is not inverted in this
155          * case.  Hence the resulting interface identifier has local
156          * scope according to RFC2373.
157          */
158 
159         addrconf_addr_eui48_base(eui, dev->dev_addr);
160 
161         if (dev->dev_id) {
162                 eui[3] = (dev->dev_id >> 8) & 0xFF;
163                 eui[4] = dev->dev_id & 0xFF;
164         } else {
165                 eui[0] ^= 2;
166         }
167 
168         return 0;
169 }
170 
171 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
172                                                    unsigned int unit)
173 {
174         if (timeout == 0xffffffff)
175                 return ~0UL;
176 
177         /*
178          * Avoid arithmetic overflow.
179          * Assuming unit is constant and non-zero, this "if" statement
180          * will go away on 64bit archs.
181          */
182         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
183                 return LONG_MAX / unit;
184 
185         return timeout;
186 }
187 
188 static inline int addrconf_finite_timeout(unsigned long timeout)
189 {
190         return ~timeout;
191 }
192 
193 /*
194  *      IPv6 Address Label subsystem (addrlabel.c)
195  */
196 int ipv6_addr_label_init(void);
197 void ipv6_addr_label_cleanup(void);
198 int ipv6_addr_label_rtnl_register(void);
199 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
200                     int type, int ifindex);
201 
202 /*
203  *      multicast prototypes (mcast.c)
204  */
205 static inline int ipv6_mc_may_pull(struct sk_buff *skb,
206                                    unsigned int len)
207 {
208         if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
209                 return 0;
210 
211         return pskb_may_pull(skb, len);
212 }
213 
214 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
215                       const struct in6_addr *addr);
216 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
217                       const struct in6_addr *addr);
218 void __ipv6_sock_mc_close(struct sock *sk);
219 void ipv6_sock_mc_close(struct sock *sk);
220 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
221                     const struct in6_addr *src_addr);
222 
223 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
224 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
225 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
226 void ipv6_mc_up(struct inet6_dev *idev);
227 void ipv6_mc_down(struct inet6_dev *idev);
228 void ipv6_mc_unmap(struct inet6_dev *idev);
229 void ipv6_mc_remap(struct inet6_dev *idev);
230 void ipv6_mc_init_dev(struct inet6_dev *idev);
231 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
232 int ipv6_mc_check_icmpv6(struct sk_buff *skb);
233 int ipv6_mc_check_mld(struct sk_buff *skb);
234 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
235 
236 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
237                          const struct in6_addr *src_addr);
238 
239 void ipv6_mc_dad_complete(struct inet6_dev *idev);
240 
241 /*
242  * identify MLD packets for MLD filter exceptions
243  */
244 static 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 
266 void addrconf_prefix_rcv(struct net_device *dev,
267                          u8 *opt, int len, bool sllao);
268 
269 /*
270  *      anycast prototypes (anycast.c)
271  */
272 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
273                       const struct in6_addr *addr);
274 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
275                       const struct in6_addr *addr);
276 void ipv6_sock_ac_close(struct sock *sk);
277 
278 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
279 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
280 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
281 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
282                          const struct in6_addr *addr);
283 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
284                              const struct in6_addr *addr);
285 int ipv6_anycast_init(void);
286 void ipv6_anycast_cleanup(void);
287 
288 /* Device notifier */
289 int register_inet6addr_notifier(struct notifier_block *nb);
290 int unregister_inet6addr_notifier(struct notifier_block *nb);
291 int inet6addr_notifier_call_chain(unsigned long val, void *v);
292 
293 int register_inet6addr_validator_notifier(struct notifier_block *nb);
294 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
295 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
296 
297 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
298                                   int ifindex, struct ipv6_devconf *devconf);
299 
300 /**
301  * __in6_dev_get - get inet6_dev pointer from netdevice
302  * @dev: network device
303  *
304  * Caller must hold rcu_read_lock or RTNL, because this function
305  * does not take a reference on the inet6_dev.
306  */
307 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
308 {
309         return rcu_dereference_rtnl(dev->ip6_ptr);
310 }
311 
312 /**
313  * __in6_dev_stats_get - get inet6_dev pointer for stats
314  * @dev: network device
315  * @skb: skb for original incoming interface if neeeded
316  *
317  * Caller must hold rcu_read_lock or RTNL, because this function
318  * does not take a reference on the inet6_dev.
319  */
320 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
321                                                     const struct sk_buff *skb)
322 {
323         if (netif_is_l3_master(dev))
324                 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
325         return __in6_dev_get(dev);
326 }
327 
328 /**
329  * __in6_dev_get_safely - get inet6_dev pointer from netdevice
330  * @dev: network device
331  *
332  * This is a safer version of __in6_dev_get
333  */
334 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
335 {
336         if (likely(dev))
337                 return rcu_dereference_rtnl(dev->ip6_ptr);
338         else
339                 return NULL;
340 }
341 
342 /**
343  * in6_dev_get - get inet6_dev pointer from netdevice
344  * @dev: network device
345  *
346  * This version can be used in any context, and takes a reference
347  * on the inet6_dev. Callers must use in6_dev_put() later to
348  * release this reference.
349  */
350 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
351 {
352         struct inet6_dev *idev;
353 
354         rcu_read_lock();
355         idev = rcu_dereference(dev->ip6_ptr);
356         if (idev)
357                 refcount_inc(&idev->refcnt);
358         rcu_read_unlock();
359         return idev;
360 }
361 
362 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
363 {
364         struct inet6_dev *idev = __in6_dev_get(dev);
365 
366         return idev ? idev->nd_parms : NULL;
367 }
368 
369 void in6_dev_finish_destroy(struct inet6_dev *idev);
370 
371 static inline void in6_dev_put(struct inet6_dev *idev)
372 {
373         if (refcount_dec_and_test(&idev->refcnt))
374                 in6_dev_finish_destroy(idev);
375 }
376 
377 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
378 {
379         struct inet6_dev *idev = *pidev;
380 
381         if (idev) {
382                 in6_dev_put(idev);
383                 *pidev = NULL;
384         }
385 }
386 
387 static inline void __in6_dev_put(struct inet6_dev *idev)
388 {
389         refcount_dec(&idev->refcnt);
390 }
391 
392 static inline void in6_dev_hold(struct inet6_dev *idev)
393 {
394         refcount_inc(&idev->refcnt);
395 }
396 
397 /* called with rcu_read_lock held */
398 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
399 {
400         const struct inet6_dev *idev = __in6_dev_get(dev);
401 
402         return !!idev->cnf.ignore_routes_with_linkdown;
403 }
404 
405 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
406 
407 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
408 {
409         if (refcount_dec_and_test(&ifp->refcnt))
410                 inet6_ifa_finish_destroy(ifp);
411 }
412 
413 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
414 {
415         refcount_dec(&ifp->refcnt);
416 }
417 
418 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
419 {
420         refcount_inc(&ifp->refcnt);
421 }
422 
423 
424 /*
425  *      compute link-local solicited-node multicast address
426  */
427 
428 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
429                                              struct in6_addr *solicited)
430 {
431         ipv6_addr_set(solicited,
432                       htonl(0xFF020000), 0,
433                       htonl(0x1),
434                       htonl(0xFF000000) | addr->s6_addr32[3]);
435 }
436 
437 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
438 {
439 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
440         __be64 *p = (__be64 *)addr;
441         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
442 #else
443         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
444                 addr->s6_addr32[1] | addr->s6_addr32[2] |
445                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
446 #endif
447 }
448 
449 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
450 {
451 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
452         __be64 *p = (__be64 *)addr;
453         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
454 #else
455         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
456                 addr->s6_addr32[1] | addr->s6_addr32[2] |
457                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
458 #endif
459 }
460 
461 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
462 {
463         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
464 }
465 
466 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
467 {
468 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
469         __be64 *p = (__be64 *)addr;
470         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
471                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
472                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
473 #else
474         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
475                 addr->s6_addr32[1] |
476                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
477                 (addr->s6_addr[12] ^ 0xff)) == 0;
478 #endif
479 }
480 
481 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
482 {
483 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
484         __be64 *p = (__be64 *)addr;
485 
486         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
487                 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
488 #else
489         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
490                 addr->s6_addr32[1] | addr->s6_addr32[2] |
491                 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
492 #endif
493 }
494 
495 #ifdef CONFIG_PROC_FS
496 int if6_proc_init(void);
497 void if6_proc_exit(void);
498 #endif
499 
500 #endif
501 

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