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

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