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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 static 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 
128 static 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 
145 static inline int addrconf_finite_timeout(unsigned long timeout)
146 {
147         return ~timeout;
148 }
149 
150 /*
151  *      IPv6 Address Label subsystem (addrlabel.c)
152  */
153 int ipv6_addr_label_init(void);
154 void ipv6_addr_label_cleanup(void);
155 void ipv6_addr_label_rtnl_register(void);
156 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
157                     int type, int ifindex);
158 
159 /*
160  *      multicast prototypes (mcast.c)
161  */
162 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
163                       const struct in6_addr *addr);
164 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
165                       const struct in6_addr *addr);
166 void ipv6_sock_mc_close(struct sock *sk);
167 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
168                     const struct in6_addr *src_addr);
169 
170 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
171 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
172 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
173 void ipv6_mc_up(struct inet6_dev *idev);
174 void ipv6_mc_down(struct inet6_dev *idev);
175 void ipv6_mc_unmap(struct inet6_dev *idev);
176 void ipv6_mc_remap(struct inet6_dev *idev);
177 void ipv6_mc_init_dev(struct inet6_dev *idev);
178 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
179 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
180 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
181 
182 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
183                          const struct in6_addr *src_addr);
184 
185 void 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  */
190 struct 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 };
203 extern const struct ipv6_stub *ipv6_stub __read_mostly;
204 
205 /*
206  * identify MLD packets for MLD filter exceptions
207  */
208 static 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 
230 void addrconf_prefix_rcv(struct net_device *dev,
231                          u8 *opt, int len, bool sllao);
232 
233 /*
234  *      anycast prototypes (anycast.c)
235  */
236 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
237                       const struct in6_addr *addr);
238 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
239                       const struct in6_addr *addr);
240 void ipv6_sock_ac_close(struct sock *sk);
241 
242 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
243 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
244 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
245 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
246                          const struct in6_addr *addr);
247 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
248                              const struct in6_addr *addr);
249 
250 /* Device notifier */
251 int register_inet6addr_notifier(struct notifier_block *nb);
252 int unregister_inet6addr_notifier(struct notifier_block *nb);
253 int inet6addr_notifier_call_chain(unsigned long val, void *v);
254 
255 void 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  */
265 static 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  */
278 static 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 
290 static 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 
297 void in6_dev_finish_destroy(struct inet6_dev *idev);
298 
299 static 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 
305 static inline void __in6_dev_put(struct inet6_dev *idev)
306 {
307         atomic_dec(&idev->refcnt);
308 }
309 
310 static inline void in6_dev_hold(struct inet6_dev *idev)
311 {
312         atomic_inc(&idev->refcnt);
313 }
314 
315 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
316 
317 static 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 
323 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
324 {
325         atomic_dec(&ifp->refcnt);
326 }
327 
328 static 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 
338 static 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 
347 static 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 
359 static 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 
371 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
372 {
373         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
374 }
375 
376 static 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
392 int if6_proc_init(void);
393 void if6_proc_exit(void);
394 #endif
395 
396 #endif
397 

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