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1 | #ifndef _ADDRCONF_H | |
2 | #define _ADDRCONF_H | |
3 | ||
4 | #define MAX_RTR_SOLICITATIONS -1 /* unlimited */ | |
5 | #define RTR_SOLICITATION_INTERVAL (4*HZ) | |
6 | #define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */ | |
7 | ||
8 | #define MIN_VALID_LIFETIME (2*3600) /* 2 hours */ | |
9 | ||
10 | #define TEMP_VALID_LIFETIME (7*86400) | |
11 | #define TEMP_PREFERRED_LIFETIME (86400) | |
12 | #define REGEN_MAX_RETRY (3) | |
13 | #define MAX_DESYNC_FACTOR (600) | |
14 | ||
15 | #define ADDR_CHECK_FREQUENCY (120*HZ) | |
16 | ||
17 | #define IPV6_MAX_ADDRESSES 16 | |
18 | ||
19 | #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1) | |
20 | #define ADDRCONF_TIMER_FUZZ (HZ / 4) | |
21 | #define ADDRCONF_TIMER_FUZZ_MAX (HZ) | |
22 | ||
23 | #define ADDRCONF_NOTIFY_PRIORITY 0 | |
24 | ||
25 | #include <linux/in.h> | |
26 | #include <linux/in6.h> | |
27 | ||
28 | struct prefix_info { | |
29 | __u8 type; | |
30 | __u8 length; | |
31 | __u8 prefix_len; | |
32 | ||
33 | #if defined(__BIG_ENDIAN_BITFIELD) | |
34 | __u8 onlink : 1, | |
35 | autoconf : 1, | |
36 | reserved : 6; | |
37 | #elif defined(__LITTLE_ENDIAN_BITFIELD) | |
38 | __u8 reserved : 6, | |
39 | autoconf : 1, | |
40 | onlink : 1; | |
41 | #else | |
42 | #error "Please fix <asm/byteorder.h>" | |
43 | #endif | |
44 | __be32 valid; | |
45 | __be32 prefered; | |
46 | __be32 reserved2; | |
47 | ||
48 | struct in6_addr prefix; | |
49 | }; | |
50 | ||
51 | ||
52 | #include <linux/netdevice.h> | |
53 | #include <net/if_inet6.h> | |
54 | #include <net/ipv6.h> | |
55 | ||
56 | #define IN6_ADDR_HSIZE_SHIFT 4 | |
57 | #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) | |
58 | ||
59 | int addrconf_init(void); | |
60 | void addrconf_cleanup(void); | |
61 | ||
62 | int addrconf_add_ifaddr(struct net *net, void __user *arg); | |
63 | int addrconf_del_ifaddr(struct net *net, void __user *arg); | |
64 | int addrconf_set_dstaddr(struct net *net, void __user *arg); | |
65 | ||
66 | int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, | |
67 | const struct net_device *dev, int strict); | |
68 | int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, | |
69 | const struct net_device *dev, int strict, | |
70 | u32 banned_flags); | |
71 | ||
72 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) | |
73 | int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); | |
74 | #endif | |
75 | ||
76 | bool ipv6_chk_custom_prefix(const struct in6_addr *addr, | |
77 | const unsigned int prefix_len, | |
78 | struct net_device *dev); | |
79 | ||
80 | int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); | |
81 | ||
82 | struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, | |
83 | const struct in6_addr *addr, | |
84 | struct net_device *dev, int strict); | |
85 | ||
86 | int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, | |
87 | const struct in6_addr *daddr, unsigned int srcprefs, | |
88 | struct in6_addr *saddr); | |
89 | int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, | |
90 | u32 banned_flags); | |
91 | int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, | |
92 | u32 banned_flags); | |
93 | int inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, | |
94 | bool match_wildcard); | |
95 | void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); | |
96 | void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); | |
97 | ||
98 | void addrconf_add_linklocal(struct inet6_dev *idev, | |
99 | const struct in6_addr *addr, u32 flags); | |
100 | ||
101 | int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, | |
102 | const struct prefix_info *pinfo, | |
103 | struct inet6_dev *in6_dev, | |
104 | const struct in6_addr *addr, int addr_type, | |
105 | u32 addr_flags, bool sllao, bool tokenized, | |
106 | __u32 valid_lft, u32 prefered_lft); | |
107 | ||
108 | static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr) | |
109 | { | |
110 | memcpy(eui, addr, 3); | |
111 | eui[3] = 0xFF; | |
112 | eui[4] = 0xFE; | |
113 | memcpy(eui + 5, addr + 3, 3); | |
114 | } | |
115 | ||
116 | static inline void addrconf_addr_eui48(u8 *eui, const char *const addr) | |
117 | { | |
118 | addrconf_addr_eui48_base(eui, addr); | |
119 | eui[0] ^= 2; | |
120 | } | |
121 | ||
122 | static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) | |
123 | { | |
124 | if (dev->addr_len != ETH_ALEN) | |
125 | return -1; | |
126 | ||
127 | /* | |
128 | * The zSeries OSA network cards can be shared among various | |
129 | * OS instances, but the OSA cards have only one MAC address. | |
130 | * This leads to duplicate address conflicts in conjunction | |
131 | * with IPv6 if more than one instance uses the same card. | |
132 | * | |
133 | * The driver for these cards can deliver a unique 16-bit | |
134 | * identifier for each instance sharing the same card. It is | |
135 | * placed instead of 0xFFFE in the interface identifier. The | |
136 | * "u" bit of the interface identifier is not inverted in this | |
137 | * case. Hence the resulting interface identifier has local | |
138 | * scope according to RFC2373. | |
139 | */ | |
140 | ||
141 | addrconf_addr_eui48_base(eui, dev->dev_addr); | |
142 | ||
143 | if (dev->dev_id) { | |
144 | eui[3] = (dev->dev_id >> 8) & 0xFF; | |
145 | eui[4] = dev->dev_id & 0xFF; | |
146 | } else { | |
147 | eui[0] ^= 2; | |
148 | } | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static inline unsigned long addrconf_timeout_fixup(u32 timeout, | |
154 | unsigned int unit) | |
155 | { | |
156 | if (timeout == 0xffffffff) | |
157 | return ~0UL; | |
158 | ||
159 | /* | |
160 | * Avoid arithmetic overflow. | |
161 | * Assuming unit is constant and non-zero, this "if" statement | |
162 | * will go away on 64bit archs. | |
163 | */ | |
164 | if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) | |
165 | return LONG_MAX / unit; | |
166 | ||
167 | return timeout; | |
168 | } | |
169 | ||
170 | static inline int addrconf_finite_timeout(unsigned long timeout) | |
171 | { | |
172 | return ~timeout; | |
173 | } | |
174 | ||
175 | /* | |
176 | * IPv6 Address Label subsystem (addrlabel.c) | |
177 | */ | |
178 | int ipv6_addr_label_init(void); | |
179 | void ipv6_addr_label_cleanup(void); | |
180 | void ipv6_addr_label_rtnl_register(void); | |
181 | u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, | |
182 | int type, int ifindex); | |
183 | ||
184 | /* | |
185 | * multicast prototypes (mcast.c) | |
186 | */ | |
187 | int ipv6_sock_mc_join(struct sock *sk, int ifindex, | |
188 | const struct in6_addr *addr); | |
189 | int ipv6_sock_mc_drop(struct sock *sk, int ifindex, | |
190 | const struct in6_addr *addr); | |
191 | void __ipv6_sock_mc_close(struct sock *sk); | |
192 | void ipv6_sock_mc_close(struct sock *sk); | |
193 | bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, | |
194 | const struct in6_addr *src_addr); | |
195 | ||
196 | int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); | |
197 | int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); | |
198 | int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); | |
199 | void ipv6_mc_up(struct inet6_dev *idev); | |
200 | void ipv6_mc_down(struct inet6_dev *idev); | |
201 | void ipv6_mc_unmap(struct inet6_dev *idev); | |
202 | void ipv6_mc_remap(struct inet6_dev *idev); | |
203 | void ipv6_mc_init_dev(struct inet6_dev *idev); | |
204 | void ipv6_mc_destroy_dev(struct inet6_dev *idev); | |
205 | int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed); | |
206 | void addrconf_dad_failure(struct inet6_ifaddr *ifp); | |
207 | ||
208 | bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, | |
209 | const struct in6_addr *src_addr); | |
210 | ||
211 | void ipv6_mc_dad_complete(struct inet6_dev *idev); | |
212 | ||
213 | /* A stub used by vxlan module. This is ugly, ideally these | |
214 | * symbols should be built into the core kernel. | |
215 | */ | |
216 | struct ipv6_stub { | |
217 | int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, | |
218 | const struct in6_addr *addr); | |
219 | int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, | |
220 | const struct in6_addr *addr); | |
221 | int (*ipv6_dst_lookup)(struct net *net, struct sock *sk, | |
222 | struct dst_entry **dst, struct flowi6 *fl6); | |
223 | void (*udpv6_encap_enable)(void); | |
224 | void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, | |
225 | const struct in6_addr *solicited_addr, | |
226 | bool router, bool solicited, bool override, bool inc_opt); | |
227 | struct neigh_table *nd_tbl; | |
228 | }; | |
229 | extern const struct ipv6_stub *ipv6_stub __read_mostly; | |
230 | ||
231 | /* | |
232 | * identify MLD packets for MLD filter exceptions | |
233 | */ | |
234 | static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) | |
235 | { | |
236 | struct icmp6hdr *hdr; | |
237 | ||
238 | if (nexthdr != IPPROTO_ICMPV6 || | |
239 | !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) | |
240 | return false; | |
241 | ||
242 | hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); | |
243 | ||
244 | switch (hdr->icmp6_type) { | |
245 | case ICMPV6_MGM_QUERY: | |
246 | case ICMPV6_MGM_REPORT: | |
247 | case ICMPV6_MGM_REDUCTION: | |
248 | case ICMPV6_MLD2_REPORT: | |
249 | return true; | |
250 | default: | |
251 | break; | |
252 | } | |
253 | return false; | |
254 | } | |
255 | ||
256 | void addrconf_prefix_rcv(struct net_device *dev, | |
257 | u8 *opt, int len, bool sllao); | |
258 | ||
259 | /* | |
260 | * anycast prototypes (anycast.c) | |
261 | */ | |
262 | int ipv6_sock_ac_join(struct sock *sk, int ifindex, | |
263 | const struct in6_addr *addr); | |
264 | int ipv6_sock_ac_drop(struct sock *sk, int ifindex, | |
265 | const struct in6_addr *addr); | |
266 | void ipv6_sock_ac_close(struct sock *sk); | |
267 | ||
268 | int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); | |
269 | int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); | |
270 | void ipv6_ac_destroy_dev(struct inet6_dev *idev); | |
271 | bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, | |
272 | const struct in6_addr *addr); | |
273 | bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, | |
274 | const struct in6_addr *addr); | |
275 | ||
276 | /* Device notifier */ | |
277 | int register_inet6addr_notifier(struct notifier_block *nb); | |
278 | int unregister_inet6addr_notifier(struct notifier_block *nb); | |
279 | int inet6addr_notifier_call_chain(unsigned long val, void *v); | |
280 | ||
281 | void inet6_netconf_notify_devconf(struct net *net, int event, int type, | |
282 | int ifindex, struct ipv6_devconf *devconf); | |
283 | ||
284 | /** | |
285 | * __in6_dev_get - get inet6_dev pointer from netdevice | |
286 | * @dev: network device | |
287 | * | |
288 | * Caller must hold rcu_read_lock or RTNL, because this function | |
289 | * does not take a reference on the inet6_dev. | |
290 | */ | |
291 | static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) | |
292 | { | |
293 | return rcu_dereference_rtnl(dev->ip6_ptr); | |
294 | } | |
295 | ||
296 | /** | |
297 | * in6_dev_get - get inet6_dev pointer from netdevice | |
298 | * @dev: network device | |
299 | * | |
300 | * This version can be used in any context, and takes a reference | |
301 | * on the inet6_dev. Callers must use in6_dev_put() later to | |
302 | * release this reference. | |
303 | */ | |
304 | static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) | |
305 | { | |
306 | struct inet6_dev *idev; | |
307 | ||
308 | rcu_read_lock(); | |
309 | idev = rcu_dereference(dev->ip6_ptr); | |
310 | if (idev) | |
311 | atomic_inc(&idev->refcnt); | |
312 | rcu_read_unlock(); | |
313 | return idev; | |
314 | } | |
315 | ||
316 | static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) | |
317 | { | |
318 | struct inet6_dev *idev = __in6_dev_get(dev); | |
319 | ||
320 | return idev ? idev->nd_parms : NULL; | |
321 | } | |
322 | ||
323 | void in6_dev_finish_destroy(struct inet6_dev *idev); | |
324 | ||
325 | static inline void in6_dev_put(struct inet6_dev *idev) | |
326 | { | |
327 | if (atomic_dec_and_test(&idev->refcnt)) | |
328 | in6_dev_finish_destroy(idev); | |
329 | } | |
330 | ||
331 | static inline void __in6_dev_put(struct inet6_dev *idev) | |
332 | { | |
333 | atomic_dec(&idev->refcnt); | |
334 | } | |
335 | ||
336 | static inline void in6_dev_hold(struct inet6_dev *idev) | |
337 | { | |
338 | atomic_inc(&idev->refcnt); | |
339 | } | |
340 | ||
341 | void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); | |
342 | ||
343 | static inline void in6_ifa_put(struct inet6_ifaddr *ifp) | |
344 | { | |
345 | if (atomic_dec_and_test(&ifp->refcnt)) | |
346 | inet6_ifa_finish_destroy(ifp); | |
347 | } | |
348 | ||
349 | static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) | |
350 | { | |
351 | atomic_dec(&ifp->refcnt); | |
352 | } | |
353 | ||
354 | static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) | |
355 | { | |
356 | atomic_inc(&ifp->refcnt); | |
357 | } | |
358 | ||
359 | ||
360 | /* | |
361 | * compute link-local solicited-node multicast address | |
362 | */ | |
363 | ||
364 | static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, | |
365 | struct in6_addr *solicited) | |
366 | { | |
367 | ipv6_addr_set(solicited, | |
368 | htonl(0xFF020000), 0, | |
369 | htonl(0x1), | |
370 | htonl(0xFF000000) | addr->s6_addr32[3]); | |
371 | } | |
372 | ||
373 | static inline bool ipv6_addr_is_ll_all_nodes(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)) | (p[1] ^ cpu_to_be64(1))) == 0UL; | |
378 | #else | |
379 | return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | | |
380 | addr->s6_addr32[1] | addr->s6_addr32[2] | | |
381 | (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; | |
382 | #endif | |
383 | } | |
384 | ||
385 | static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) | |
386 | { | |
387 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 | |
388 | __be64 *p = (__be64 *)addr; | |
389 | return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; | |
390 | #else | |
391 | return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | | |
392 | addr->s6_addr32[1] | addr->s6_addr32[2] | | |
393 | (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; | |
394 | #endif | |
395 | } | |
396 | ||
397 | static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) | |
398 | { | |
399 | return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); | |
400 | } | |
401 | ||
402 | static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) | |
403 | { | |
404 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 | |
405 | __be64 *p = (__be64 *)addr; | |
406 | return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | | |
407 | ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & | |
408 | cpu_to_be64(0xffffffffff000000UL))) == 0UL; | |
409 | #else | |
410 | return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | | |
411 | addr->s6_addr32[1] | | |
412 | (addr->s6_addr32[2] ^ htonl(0x00000001)) | | |
413 | (addr->s6_addr[12] ^ 0xff)) == 0; | |
414 | #endif | |
415 | } | |
416 | ||
417 | #ifdef CONFIG_PROC_FS | |
418 | int if6_proc_init(void); | |
419 | void if6_proc_exit(void); | |
420 | #endif | |
421 | ||
422 | #endif |