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Linux/include/net/addrconf.h

  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 
 25 struct 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 
 56 int addrconf_init(void);
 57 void addrconf_cleanup(void);
 58 
 59 int addrconf_add_ifaddr(struct net *net, void __user *arg);
 60 int addrconf_del_ifaddr(struct net *net, void __user *arg);
 61 int addrconf_set_dstaddr(struct net *net, void __user *arg);
 62 
 63 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
 64                   const struct net_device *dev, int strict);
 65 int 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)
 70 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
 71 #endif
 72 
 73 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
 74                                    const unsigned int prefix_len,
 75                                    struct net_device *dev);
 76 
 77 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
 78 
 79 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
 80                                      const struct in6_addr *addr,
 81                                      struct net_device *dev, int strict);
 82 
 83 int 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);
 86 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
 87                       u32 banned_flags);
 88 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
 89                     u32 banned_flags);
 90 int ipv4_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
 91                          bool match_wildcard);
 92 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
 93                          bool match_wildcard);
 94 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
 95 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 96 
 97 void addrconf_add_linklocal(struct inet6_dev *idev,
 98                             const struct in6_addr *addr, u32 flags);
 99 
100 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
101                                  const struct prefix_info *pinfo,
102                                  struct inet6_dev *in6_dev,
103                                  const struct in6_addr *addr, int addr_type,
104                                  u32 addr_flags, bool sllao, bool tokenized,
105                                  __u32 valid_lft, u32 prefered_lft);
106 
107 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
108 {
109         if (dev->addr_len != ETH_ALEN)
110                 return -1;
111         memcpy(eui, dev->dev_addr, 3);
112         memcpy(eui + 5, dev->dev_addr + 3, 3);
113 
114         /*
115          * The zSeries OSA network cards can be shared among various
116          * OS instances, but the OSA cards have only one MAC address.
117          * This leads to duplicate address conflicts in conjunction
118          * with IPv6 if more than one instance uses the same card.
119          *
120          * The driver for these cards can deliver a unique 16-bit
121          * identifier for each instance sharing the same card.  It is
122          * placed instead of 0xFFFE in the interface identifier.  The
123          * "u" bit of the interface identifier is not inverted in this
124          * case.  Hence the resulting interface identifier has local
125          * scope according to RFC2373.
126          */
127         if (dev->dev_id) {
128                 eui[3] = (dev->dev_id >> 8) & 0xFF;
129                 eui[4] = dev->dev_id & 0xFF;
130         } else {
131                 eui[3] = 0xFF;
132                 eui[4] = 0xFE;
133                 eui[0] ^= 2;
134         }
135         return 0;
136 }
137 
138 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
139                                                    unsigned int unit)
140 {
141         if (timeout == 0xffffffff)
142                 return ~0UL;
143 
144         /*
145          * Avoid arithmetic overflow.
146          * Assuming unit is constant and non-zero, this "if" statement
147          * will go away on 64bit archs.
148          */
149         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
150                 return LONG_MAX / unit;
151 
152         return timeout;
153 }
154 
155 static inline int addrconf_finite_timeout(unsigned long timeout)
156 {
157         return ~timeout;
158 }
159 
160 /*
161  *      IPv6 Address Label subsystem (addrlabel.c)
162  */
163 int ipv6_addr_label_init(void);
164 void ipv6_addr_label_cleanup(void);
165 void ipv6_addr_label_rtnl_register(void);
166 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
167                     int type, int ifindex);
168 
169 /*
170  *      multicast prototypes (mcast.c)
171  */
172 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
173                       const struct in6_addr *addr);
174 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
175                       const struct in6_addr *addr);
176 void ipv6_sock_mc_close(struct sock *sk);
177 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
178                     const struct in6_addr *src_addr);
179 
180 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
181 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
182 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
183 void ipv6_mc_up(struct inet6_dev *idev);
184 void ipv6_mc_down(struct inet6_dev *idev);
185 void ipv6_mc_unmap(struct inet6_dev *idev);
186 void ipv6_mc_remap(struct inet6_dev *idev);
187 void ipv6_mc_init_dev(struct inet6_dev *idev);
188 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
189 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
190 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
191 
192 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
193                          const struct in6_addr *src_addr);
194 
195 void ipv6_mc_dad_complete(struct inet6_dev *idev);
196 
197 /* A stub used by vxlan module. This is ugly, ideally these
198  * symbols should be built into the core kernel.
199  */
200 struct ipv6_stub {
201         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
202                                  const struct in6_addr *addr);
203         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
204                                  const struct in6_addr *addr);
205         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
206                                struct dst_entry **dst, struct flowi6 *fl6);
207         void (*udpv6_encap_enable)(void);
208         void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
209                               const struct in6_addr *solicited_addr,
210                               bool router, bool solicited, bool override, bool inc_opt);
211         struct neigh_table *nd_tbl;
212 };
213 extern const struct ipv6_stub *ipv6_stub __read_mostly;
214 
215 /*
216  * identify MLD packets for MLD filter exceptions
217  */
218 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
219 {
220         struct icmp6hdr *hdr;
221 
222         if (nexthdr != IPPROTO_ICMPV6 ||
223             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
224                 return false;
225 
226         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
227 
228         switch (hdr->icmp6_type) {
229         case ICMPV6_MGM_QUERY:
230         case ICMPV6_MGM_REPORT:
231         case ICMPV6_MGM_REDUCTION:
232         case ICMPV6_MLD2_REPORT:
233                 return true;
234         default:
235                 break;
236         }
237         return false;
238 }
239 
240 void addrconf_prefix_rcv(struct net_device *dev,
241                          u8 *opt, int len, bool sllao);
242 
243 /*
244  *      anycast prototypes (anycast.c)
245  */
246 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
247                       const struct in6_addr *addr);
248 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
249                       const struct in6_addr *addr);
250 void ipv6_sock_ac_close(struct sock *sk);
251 
252 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
253 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
254 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
255 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
256                          const struct in6_addr *addr);
257 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
258                              const struct in6_addr *addr);
259 
260 /* Device notifier */
261 int register_inet6addr_notifier(struct notifier_block *nb);
262 int unregister_inet6addr_notifier(struct notifier_block *nb);
263 int inet6addr_notifier_call_chain(unsigned long val, void *v);
264 
265 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
266                                   struct ipv6_devconf *devconf);
267 
268 /**
269  * __in6_dev_get - get inet6_dev pointer from netdevice
270  * @dev: network device
271  *
272  * Caller must hold rcu_read_lock or RTNL, because this function
273  * does not take a reference on the inet6_dev.
274  */
275 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
276 {
277         return rcu_dereference_rtnl(dev->ip6_ptr);
278 }
279 
280 /**
281  * in6_dev_get - get inet6_dev pointer from netdevice
282  * @dev: network device
283  *
284  * This version can be used in any context, and takes a reference
285  * on the inet6_dev. Callers must use in6_dev_put() later to
286  * release this reference.
287  */
288 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
289 {
290         struct inet6_dev *idev;
291 
292         rcu_read_lock();
293         idev = rcu_dereference(dev->ip6_ptr);
294         if (idev)
295                 atomic_inc(&idev->refcnt);
296         rcu_read_unlock();
297         return idev;
298 }
299 
300 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
301 {
302         struct inet6_dev *idev = __in6_dev_get(dev);
303 
304         return idev ? idev->nd_parms : NULL;
305 }
306 
307 void in6_dev_finish_destroy(struct inet6_dev *idev);
308 
309 static inline void in6_dev_put(struct inet6_dev *idev)
310 {
311         if (atomic_dec_and_test(&idev->refcnt))
312                 in6_dev_finish_destroy(idev);
313 }
314 
315 static inline void __in6_dev_put(struct inet6_dev *idev)
316 {
317         atomic_dec(&idev->refcnt);
318 }
319 
320 static inline void in6_dev_hold(struct inet6_dev *idev)
321 {
322         atomic_inc(&idev->refcnt);
323 }
324 
325 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
326 
327 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
328 {
329         if (atomic_dec_and_test(&ifp->refcnt))
330                 inet6_ifa_finish_destroy(ifp);
331 }
332 
333 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
334 {
335         atomic_dec(&ifp->refcnt);
336 }
337 
338 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
339 {
340         atomic_inc(&ifp->refcnt);
341 }
342 
343 
344 /*
345  *      compute link-local solicited-node multicast address
346  */
347 
348 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
349                                              struct in6_addr *solicited)
350 {
351         ipv6_addr_set(solicited,
352                       htonl(0xFF020000), 0,
353                       htonl(0x1),
354                       htonl(0xFF000000) | addr->s6_addr32[3]);
355 }
356 
357 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
358 {
359 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
360         __be64 *p = (__be64 *)addr;
361         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
362 #else
363         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
364                 addr->s6_addr32[1] | addr->s6_addr32[2] |
365                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
366 #endif
367 }
368 
369 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
370 {
371 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
372         __be64 *p = (__be64 *)addr;
373         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
374 #else
375         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
376                 addr->s6_addr32[1] | addr->s6_addr32[2] |
377                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
378 #endif
379 }
380 
381 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
382 {
383         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
384 }
385 
386 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
387 {
388 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
389         __be64 *p = (__be64 *)addr;
390         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
391                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
392                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
393 #else
394         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
395                 addr->s6_addr32[1] |
396                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
397                 (addr->s6_addr[12] ^ 0xff)) == 0;
398 #endif
399 }
400 
401 #ifdef CONFIG_PROC_FS
402 int if6_proc_init(void);
403 void if6_proc_exit(void);
404 #endif
405 
406 #endif
407 

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