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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 
 66 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 67 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
 68 #endif
 69 
 70 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
 71                                    const unsigned int prefix_len,
 72                                    struct net_device *dev);
 73 
 74 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
 75 
 76 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
 77                                      const struct in6_addr *addr,
 78                                      struct net_device *dev, int strict);
 79 
 80 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
 81                        const struct in6_addr *daddr, unsigned int srcprefs,
 82                        struct in6_addr *saddr);
 83 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
 84                       u32 banned_flags);
 85 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
 86                     u32 banned_flags);
 87 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2);
 88 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
 89 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 90 
 91 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 92                                                    unsigned int unit)
 93 {
 94         if (timeout == 0xffffffff)
 95                 return ~0UL;
 96 
 97         /*
 98          * Avoid arithmetic overflow.
 99          * Assuming unit is constant and non-zero, this "if" statement
100          * will go away on 64bit archs.
101          */
102         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
103                 return LONG_MAX / unit;
104 
105         return timeout;
106 }
107 
108 static inline int addrconf_finite_timeout(unsigned long timeout)
109 {
110         return ~timeout;
111 }
112 
113 /*
114  *      IPv6 Address Label subsystem (addrlabel.c)
115  */
116 int ipv6_addr_label_init(void);
117 void ipv6_addr_label_cleanup(void);
118 void ipv6_addr_label_rtnl_register(void);
119 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
120                     int type, int ifindex);
121 
122 /*
123  *      multicast prototypes (mcast.c)
124  */
125 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
126                       const struct in6_addr *addr);
127 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
128                       const struct in6_addr *addr);
129 void ipv6_sock_mc_close(struct sock *sk);
130 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
131                     const struct in6_addr *src_addr);
132 
133 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
134 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
135 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
136 void ipv6_mc_up(struct inet6_dev *idev);
137 void ipv6_mc_down(struct inet6_dev *idev);
138 void ipv6_mc_unmap(struct inet6_dev *idev);
139 void ipv6_mc_remap(struct inet6_dev *idev);
140 void ipv6_mc_init_dev(struct inet6_dev *idev);
141 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
142 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
143 
144 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
145                          const struct in6_addr *src_addr);
146 
147 void ipv6_mc_dad_complete(struct inet6_dev *idev);
148 
149 /* A stub used by vxlan module. This is ugly, ideally these
150  * symbols should be built into the core kernel.
151  */
152 struct ipv6_stub {
153         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
154                                  const struct in6_addr *addr);
155         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
156                                  const struct in6_addr *addr);
157         int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst,
158                                 struct flowi6 *fl6);
159         void (*udpv6_encap_enable)(void);
160         void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
161                               const struct in6_addr *daddr,
162                               const struct in6_addr *solicited_addr,
163                               bool router, bool solicited, bool override, bool inc_opt);
164         struct neigh_table *nd_tbl;
165 };
166 extern const struct ipv6_stub *ipv6_stub __read_mostly;
167 
168 /*
169  * identify MLD packets for MLD filter exceptions
170  */
171 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
172 {
173         struct icmp6hdr *hdr;
174 
175         if (nexthdr != IPPROTO_ICMPV6 ||
176             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
177                 return false;
178 
179         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
180 
181         switch (hdr->icmp6_type) {
182         case ICMPV6_MGM_QUERY:
183         case ICMPV6_MGM_REPORT:
184         case ICMPV6_MGM_REDUCTION:
185         case ICMPV6_MLD2_REPORT:
186                 return true;
187         default:
188                 break;
189         }
190         return false;
191 }
192 
193 void addrconf_prefix_rcv(struct net_device *dev,
194                          u8 *opt, int len, bool sllao);
195 
196 /*
197  *      anycast prototypes (anycast.c)
198  */
199 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
200                       const struct in6_addr *addr);
201 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
202                       const struct in6_addr *addr);
203 void ipv6_sock_ac_close(struct sock *sk);
204 
205 int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
206 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
207 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
208                          const struct in6_addr *addr);
209 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
210                              const struct in6_addr *addr);
211 
212 /* Device notifier */
213 int register_inet6addr_notifier(struct notifier_block *nb);
214 int unregister_inet6addr_notifier(struct notifier_block *nb);
215 int inet6addr_notifier_call_chain(unsigned long val, void *v);
216 
217 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
218                                   struct ipv6_devconf *devconf);
219 
220 /**
221  * __in6_dev_get - get inet6_dev pointer from netdevice
222  * @dev: network device
223  *
224  * Caller must hold rcu_read_lock or RTNL, because this function
225  * does not take a reference on the inet6_dev.
226  */
227 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
228 {
229         return rcu_dereference_rtnl(dev->ip6_ptr);
230 }
231 
232 /**
233  * in6_dev_get - get inet6_dev pointer from netdevice
234  * @dev: network device
235  *
236  * This version can be used in any context, and takes a reference
237  * on the inet6_dev. Callers must use in6_dev_put() later to
238  * release this reference.
239  */
240 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
241 {
242         struct inet6_dev *idev;
243 
244         rcu_read_lock();
245         idev = rcu_dereference(dev->ip6_ptr);
246         if (idev)
247                 atomic_inc(&idev->refcnt);
248         rcu_read_unlock();
249         return idev;
250 }
251 
252 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
253 {
254         struct inet6_dev *idev = __in6_dev_get(dev);
255 
256         return idev ? idev->nd_parms : NULL;
257 }
258 
259 void in6_dev_finish_destroy(struct inet6_dev *idev);
260 
261 static inline void in6_dev_put(struct inet6_dev *idev)
262 {
263         if (atomic_dec_and_test(&idev->refcnt))
264                 in6_dev_finish_destroy(idev);
265 }
266 
267 static inline void __in6_dev_put(struct inet6_dev *idev)
268 {
269         atomic_dec(&idev->refcnt);
270 }
271 
272 static inline void in6_dev_hold(struct inet6_dev *idev)
273 {
274         atomic_inc(&idev->refcnt);
275 }
276 
277 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
278 
279 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
280 {
281         if (atomic_dec_and_test(&ifp->refcnt))
282                 inet6_ifa_finish_destroy(ifp);
283 }
284 
285 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
286 {
287         atomic_dec(&ifp->refcnt);
288 }
289 
290 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
291 {
292         atomic_inc(&ifp->refcnt);
293 }
294 
295 
296 /*
297  *      compute link-local solicited-node multicast address
298  */
299 
300 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
301                                              struct in6_addr *solicited)
302 {
303         ipv6_addr_set(solicited,
304                       htonl(0xFF020000), 0,
305                       htonl(0x1),
306                       htonl(0xFF000000) | addr->s6_addr32[3]);
307 }
308 
309 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
310 {
311         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
312 }
313 
314 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
315 {
316 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
317         __u64 *p = (__u64 *)addr;
318         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
319 #else
320         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
321                 addr->s6_addr32[1] | addr->s6_addr32[2] |
322                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
323 #endif
324 }
325 
326 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
327 {
328 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
329         __u64 *p = (__u64 *)addr;
330         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
331 #else
332         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
333                 addr->s6_addr32[1] | addr->s6_addr32[2] |
334                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
335 #endif
336 }
337 
338 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
339 {
340         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
341 }
342 
343 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
344 {
345 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
346         __u64 *p = (__u64 *)addr;
347         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
348                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
349                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
350 #else
351         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
352                 addr->s6_addr32[1] |
353                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
354                 (addr->s6_addr[12] ^ 0xff)) == 0;
355 #endif
356 }
357 
358 #ifdef CONFIG_PROC_FS
359 int if6_proc_init(void);
360 void if6_proc_exit(void);
361 #endif
362 
363 #endif
364 

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