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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 ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2);
 91 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
 92 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 93 
 94 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 95                                                    unsigned int unit)
 96 {
 97         if (timeout == 0xffffffff)
 98                 return ~0UL;
 99 
100         /*
101          * Avoid arithmetic overflow.
102          * Assuming unit is constant and non-zero, this "if" statement
103          * will go away on 64bit archs.
104          */
105         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
106                 return LONG_MAX / unit;
107 
108         return timeout;
109 }
110 
111 static inline int addrconf_finite_timeout(unsigned long timeout)
112 {
113         return ~timeout;
114 }
115 
116 /*
117  *      IPv6 Address Label subsystem (addrlabel.c)
118  */
119 int ipv6_addr_label_init(void);
120 void ipv6_addr_label_cleanup(void);
121 void ipv6_addr_label_rtnl_register(void);
122 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
123                     int type, int ifindex);
124 
125 /*
126  *      multicast prototypes (mcast.c)
127  */
128 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
129                       const struct in6_addr *addr);
130 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
131                       const struct in6_addr *addr);
132 void ipv6_sock_mc_close(struct sock *sk);
133 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
134                     const struct in6_addr *src_addr);
135 
136 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
137 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
138 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
139 void ipv6_mc_up(struct inet6_dev *idev);
140 void ipv6_mc_down(struct inet6_dev *idev);
141 void ipv6_mc_unmap(struct inet6_dev *idev);
142 void ipv6_mc_remap(struct inet6_dev *idev);
143 void ipv6_mc_init_dev(struct inet6_dev *idev);
144 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
145 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
146 
147 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
148                          const struct in6_addr *src_addr);
149 
150 void ipv6_mc_dad_complete(struct inet6_dev *idev);
151 
152 /* A stub used by vxlan module. This is ugly, ideally these
153  * symbols should be built into the core kernel.
154  */
155 struct ipv6_stub {
156         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
157                                  const struct in6_addr *addr);
158         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
159                                  const struct in6_addr *addr);
160         int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst,
161                                 struct flowi6 *fl6);
162         void (*udpv6_encap_enable)(void);
163         void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
164                               const struct in6_addr *daddr,
165                               const struct in6_addr *solicited_addr,
166                               bool router, bool solicited, bool override, bool inc_opt);
167         struct neigh_table *nd_tbl;
168 };
169 extern const struct ipv6_stub *ipv6_stub __read_mostly;
170 
171 /*
172  * identify MLD packets for MLD filter exceptions
173  */
174 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
175 {
176         struct icmp6hdr *hdr;
177 
178         if (nexthdr != IPPROTO_ICMPV6 ||
179             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
180                 return false;
181 
182         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
183 
184         switch (hdr->icmp6_type) {
185         case ICMPV6_MGM_QUERY:
186         case ICMPV6_MGM_REPORT:
187         case ICMPV6_MGM_REDUCTION:
188         case ICMPV6_MLD2_REPORT:
189                 return true;
190         default:
191                 break;
192         }
193         return false;
194 }
195 
196 void addrconf_prefix_rcv(struct net_device *dev,
197                          u8 *opt, int len, bool sllao);
198 
199 /*
200  *      anycast prototypes (anycast.c)
201  */
202 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
203                       const struct in6_addr *addr);
204 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
205                       const struct in6_addr *addr);
206 void ipv6_sock_ac_close(struct sock *sk);
207 
208 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
209 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
210 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
211 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
212                          const struct in6_addr *addr);
213 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
214                              const struct in6_addr *addr);
215 
216 /* Device notifier */
217 int register_inet6addr_notifier(struct notifier_block *nb);
218 int unregister_inet6addr_notifier(struct notifier_block *nb);
219 int inet6addr_notifier_call_chain(unsigned long val, void *v);
220 
221 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
222                                   struct ipv6_devconf *devconf);
223 
224 /**
225  * __in6_dev_get - get inet6_dev pointer from netdevice
226  * @dev: network device
227  *
228  * Caller must hold rcu_read_lock or RTNL, because this function
229  * does not take a reference on the inet6_dev.
230  */
231 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
232 {
233         return rcu_dereference_rtnl(dev->ip6_ptr);
234 }
235 
236 /**
237  * in6_dev_get - get inet6_dev pointer from netdevice
238  * @dev: network device
239  *
240  * This version can be used in any context, and takes a reference
241  * on the inet6_dev. Callers must use in6_dev_put() later to
242  * release this reference.
243  */
244 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
245 {
246         struct inet6_dev *idev;
247 
248         rcu_read_lock();
249         idev = rcu_dereference(dev->ip6_ptr);
250         if (idev)
251                 atomic_inc(&idev->refcnt);
252         rcu_read_unlock();
253         return idev;
254 }
255 
256 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
257 {
258         struct inet6_dev *idev = __in6_dev_get(dev);
259 
260         return idev ? idev->nd_parms : NULL;
261 }
262 
263 void in6_dev_finish_destroy(struct inet6_dev *idev);
264 
265 static inline void in6_dev_put(struct inet6_dev *idev)
266 {
267         if (atomic_dec_and_test(&idev->refcnt))
268                 in6_dev_finish_destroy(idev);
269 }
270 
271 static inline void __in6_dev_put(struct inet6_dev *idev)
272 {
273         atomic_dec(&idev->refcnt);
274 }
275 
276 static inline void in6_dev_hold(struct inet6_dev *idev)
277 {
278         atomic_inc(&idev->refcnt);
279 }
280 
281 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
282 
283 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
284 {
285         if (atomic_dec_and_test(&ifp->refcnt))
286                 inet6_ifa_finish_destroy(ifp);
287 }
288 
289 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
290 {
291         atomic_dec(&ifp->refcnt);
292 }
293 
294 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
295 {
296         atomic_inc(&ifp->refcnt);
297 }
298 
299 
300 /*
301  *      compute link-local solicited-node multicast address
302  */
303 
304 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
305                                              struct in6_addr *solicited)
306 {
307         ipv6_addr_set(solicited,
308                       htonl(0xFF020000), 0,
309                       htonl(0x1),
310                       htonl(0xFF000000) | addr->s6_addr32[3]);
311 }
312 
313 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
314 {
315 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
316         __be64 *p = (__be64 *)addr;
317         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
318 #else
319         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
320                 addr->s6_addr32[1] | addr->s6_addr32[2] |
321                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
322 #endif
323 }
324 
325 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
326 {
327 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
328         __be64 *p = (__be64 *)addr;
329         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
330 #else
331         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
332                 addr->s6_addr32[1] | addr->s6_addr32[2] |
333                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
334 #endif
335 }
336 
337 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
338 {
339         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
340 }
341 
342 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
343 {
344 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
345         __be64 *p = (__be64 *)addr;
346         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
347                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
348                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
349 #else
350         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
351                 addr->s6_addr32[1] |
352                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
353                 (addr->s6_addr[12] ^ 0xff)) == 0;
354 #endif
355 }
356 
357 #ifdef CONFIG_PROC_FS
358 int if6_proc_init(void);
359 void if6_proc_exit(void);
360 #endif
361 
362 #endif
363 

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