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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 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
146 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
147 
148 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
149                          const struct in6_addr *src_addr);
150 
151 void ipv6_mc_dad_complete(struct inet6_dev *idev);
152 
153 /* A stub used by vxlan module. This is ugly, ideally these
154  * symbols should be built into the core kernel.
155  */
156 struct ipv6_stub {
157         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
158                                  const struct in6_addr *addr);
159         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
160                                  const struct in6_addr *addr);
161         int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst,
162                                 struct flowi6 *fl6);
163         void (*udpv6_encap_enable)(void);
164         void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
165                               const struct in6_addr *daddr,
166                               const struct in6_addr *solicited_addr,
167                               bool router, bool solicited, bool override, bool inc_opt);
168         struct neigh_table *nd_tbl;
169 };
170 extern const struct ipv6_stub *ipv6_stub __read_mostly;
171 
172 /*
173  * identify MLD packets for MLD filter exceptions
174  */
175 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
176 {
177         struct icmp6hdr *hdr;
178 
179         if (nexthdr != IPPROTO_ICMPV6 ||
180             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
181                 return false;
182 
183         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
184 
185         switch (hdr->icmp6_type) {
186         case ICMPV6_MGM_QUERY:
187         case ICMPV6_MGM_REPORT:
188         case ICMPV6_MGM_REDUCTION:
189         case ICMPV6_MLD2_REPORT:
190                 return true;
191         default:
192                 break;
193         }
194         return false;
195 }
196 
197 void addrconf_prefix_rcv(struct net_device *dev,
198                          u8 *opt, int len, bool sllao);
199 
200 /*
201  *      anycast prototypes (anycast.c)
202  */
203 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
204                       const struct in6_addr *addr);
205 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
206                       const struct in6_addr *addr);
207 void ipv6_sock_ac_close(struct sock *sk);
208 
209 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
210 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
211 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
212 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
213                          const struct in6_addr *addr);
214 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
215                              const struct in6_addr *addr);
216 
217 /* Device notifier */
218 int register_inet6addr_notifier(struct notifier_block *nb);
219 int unregister_inet6addr_notifier(struct notifier_block *nb);
220 int inet6addr_notifier_call_chain(unsigned long val, void *v);
221 
222 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
223                                   struct ipv6_devconf *devconf);
224 
225 /**
226  * __in6_dev_get - get inet6_dev pointer from netdevice
227  * @dev: network device
228  *
229  * Caller must hold rcu_read_lock or RTNL, because this function
230  * does not take a reference on the inet6_dev.
231  */
232 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
233 {
234         return rcu_dereference_rtnl(dev->ip6_ptr);
235 }
236 
237 /**
238  * in6_dev_get - get inet6_dev pointer from netdevice
239  * @dev: network device
240  *
241  * This version can be used in any context, and takes a reference
242  * on the inet6_dev. Callers must use in6_dev_put() later to
243  * release this reference.
244  */
245 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
246 {
247         struct inet6_dev *idev;
248 
249         rcu_read_lock();
250         idev = rcu_dereference(dev->ip6_ptr);
251         if (idev)
252                 atomic_inc(&idev->refcnt);
253         rcu_read_unlock();
254         return idev;
255 }
256 
257 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
258 {
259         struct inet6_dev *idev = __in6_dev_get(dev);
260 
261         return idev ? idev->nd_parms : NULL;
262 }
263 
264 void in6_dev_finish_destroy(struct inet6_dev *idev);
265 
266 static inline void in6_dev_put(struct inet6_dev *idev)
267 {
268         if (atomic_dec_and_test(&idev->refcnt))
269                 in6_dev_finish_destroy(idev);
270 }
271 
272 static inline void __in6_dev_put(struct inet6_dev *idev)
273 {
274         atomic_dec(&idev->refcnt);
275 }
276 
277 static inline void in6_dev_hold(struct inet6_dev *idev)
278 {
279         atomic_inc(&idev->refcnt);
280 }
281 
282 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
283 
284 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
285 {
286         if (atomic_dec_and_test(&ifp->refcnt))
287                 inet6_ifa_finish_destroy(ifp);
288 }
289 
290 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
291 {
292         atomic_dec(&ifp->refcnt);
293 }
294 
295 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
296 {
297         atomic_inc(&ifp->refcnt);
298 }
299 
300 
301 /*
302  *      compute link-local solicited-node multicast address
303  */
304 
305 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
306                                              struct in6_addr *solicited)
307 {
308         ipv6_addr_set(solicited,
309                       htonl(0xFF020000), 0,
310                       htonl(0x1),
311                       htonl(0xFF000000) | addr->s6_addr32[3]);
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         __be64 *p = (__be64 *)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         __be64 *p = (__be64 *)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         __be64 *p = (__be64 *)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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