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1 | /* | |
2 | * IPv6 Address [auto]configuration | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Changes: | |
17 | * | |
18 | * Janos Farkas : delete timer on ifdown | |
19 | * <chexum@bankinf.banki.hu> | |
20 | * Andi Kleen : kill double kfree on module | |
21 | * unload. | |
22 | * Maciej W. Rozycki : FDDI support | |
23 | * sekiya@USAGI : Don't send too many RS | |
24 | * packets. | |
25 | * yoshfuji@USAGI : Fixed interval between DAD | |
26 | * packets. | |
27 | * YOSHIFUJI Hideaki @USAGI : improved accuracy of | |
28 | * address validation timer. | |
29 | * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) | |
30 | * support. | |
31 | * Yuji SEKIYA @USAGI : Don't assign a same IPv6 | |
32 | * address on a same interface. | |
33 | * YOSHIFUJI Hideaki @USAGI : ARCnet support | |
34 | * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to | |
35 | * seq_file. | |
36 | * YOSHIFUJI Hideaki @USAGI : improved source address | |
37 | * selection; consider scope, | |
38 | * status etc. | |
39 | */ | |
40 | ||
41 | #include <linux/errno.h> | |
42 | #include <linux/types.h> | |
43 | #include <linux/kernel.h> | |
44 | #include <linux/socket.h> | |
45 | #include <linux/sockios.h> | |
46 | #include <linux/net.h> | |
47 | #include <linux/in6.h> | |
48 | #include <linux/netdevice.h> | |
49 | #include <linux/if_addr.h> | |
50 | #include <linux/if_arp.h> | |
51 | #include <linux/if_arcnet.h> | |
52 | #include <linux/if_infiniband.h> | |
53 | #include <linux/route.h> | |
54 | #include <linux/inetdevice.h> | |
55 | #include <linux/init.h> | |
56 | #include <linux/slab.h> | |
57 | #ifdef CONFIG_SYSCTL | |
58 | #include <linux/sysctl.h> | |
59 | #endif | |
60 | #include <linux/capability.h> | |
61 | #include <linux/delay.h> | |
62 | #include <linux/notifier.h> | |
63 | #include <linux/string.h> | |
64 | ||
65 | #include <net/net_namespace.h> | |
66 | #include <net/sock.h> | |
67 | #include <net/snmp.h> | |
68 | ||
69 | #include <net/ipv6.h> | |
70 | #include <net/protocol.h> | |
71 | #include <net/ndisc.h> | |
72 | #include <net/ip6_route.h> | |
73 | #include <net/addrconf.h> | |
74 | #include <net/tcp.h> | |
75 | #include <net/ip.h> | |
76 | #include <net/netlink.h> | |
77 | #include <net/pkt_sched.h> | |
78 | #include <linux/if_tunnel.h> | |
79 | #include <linux/rtnetlink.h> | |
80 | ||
81 | #ifdef CONFIG_IPV6_PRIVACY | |
82 | #include <linux/random.h> | |
83 | #endif | |
84 | ||
85 | #include <linux/uaccess.h> | |
86 | #include <asm/unaligned.h> | |
87 | ||
88 | #include <linux/proc_fs.h> | |
89 | #include <linux/seq_file.h> | |
90 | ||
91 | /* Set to 3 to get tracing... */ | |
92 | #define ACONF_DEBUG 2 | |
93 | ||
94 | #if ACONF_DEBUG >= 3 | |
95 | #define ADBG(x) printk x | |
96 | #else | |
97 | #define ADBG(x) | |
98 | #endif | |
99 | ||
100 | #define INFINITY_LIFE_TIME 0xFFFFFFFF | |
101 | #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b))) | |
102 | ||
103 | #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) | |
104 | #define ADDRCONF_TIMER_FUZZ (HZ / 4) | |
105 | #define ADDRCONF_TIMER_FUZZ_MAX (HZ) | |
106 | ||
107 | #ifdef CONFIG_SYSCTL | |
108 | static void addrconf_sysctl_register(struct inet6_dev *idev); | |
109 | static void addrconf_sysctl_unregister(struct inet6_dev *idev); | |
110 | #else | |
111 | static inline void addrconf_sysctl_register(struct inet6_dev *idev) | |
112 | { | |
113 | } | |
114 | ||
115 | static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) | |
116 | { | |
117 | } | |
118 | #endif | |
119 | ||
120 | #ifdef CONFIG_IPV6_PRIVACY | |
121 | static int __ipv6_regen_rndid(struct inet6_dev *idev); | |
122 | static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); | |
123 | static void ipv6_regen_rndid(unsigned long data); | |
124 | #endif | |
125 | ||
126 | static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); | |
127 | static int ipv6_count_addresses(struct inet6_dev *idev); | |
128 | ||
129 | /* | |
130 | * Configured unicast address hash table | |
131 | */ | |
132 | static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; | |
133 | static DEFINE_SPINLOCK(addrconf_hash_lock); | |
134 | ||
135 | static void addrconf_verify(unsigned long); | |
136 | ||
137 | static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); | |
138 | static DEFINE_SPINLOCK(addrconf_verify_lock); | |
139 | ||
140 | static void addrconf_join_anycast(struct inet6_ifaddr *ifp); | |
141 | static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); | |
142 | ||
143 | static void addrconf_type_change(struct net_device *dev, | |
144 | unsigned long event); | |
145 | static int addrconf_ifdown(struct net_device *dev, int how); | |
146 | ||
147 | static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); | |
148 | static void addrconf_dad_timer(unsigned long data); | |
149 | static void addrconf_dad_completed(struct inet6_ifaddr *ifp); | |
150 | static void addrconf_dad_run(struct inet6_dev *idev); | |
151 | static void addrconf_rs_timer(unsigned long data); | |
152 | static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); | |
153 | static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); | |
154 | ||
155 | static void inet6_prefix_notify(int event, struct inet6_dev *idev, | |
156 | struct prefix_info *pinfo); | |
157 | static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, | |
158 | struct net_device *dev); | |
159 | ||
160 | static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); | |
161 | ||
162 | static struct ipv6_devconf ipv6_devconf __read_mostly = { | |
163 | .forwarding = 0, | |
164 | .hop_limit = IPV6_DEFAULT_HOPLIMIT, | |
165 | .mtu6 = IPV6_MIN_MTU, | |
166 | .accept_ra = 1, | |
167 | .accept_redirects = 1, | |
168 | .autoconf = 1, | |
169 | .force_mld_version = 0, | |
170 | .dad_transmits = 1, | |
171 | .rtr_solicits = MAX_RTR_SOLICITATIONS, | |
172 | .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, | |
173 | .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, | |
174 | #ifdef CONFIG_IPV6_PRIVACY | |
175 | .use_tempaddr = 0, | |
176 | .temp_valid_lft = TEMP_VALID_LIFETIME, | |
177 | .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, | |
178 | .regen_max_retry = REGEN_MAX_RETRY, | |
179 | .max_desync_factor = MAX_DESYNC_FACTOR, | |
180 | #endif | |
181 | .max_addresses = IPV6_MAX_ADDRESSES, | |
182 | .accept_ra_defrtr = 1, | |
183 | .accept_ra_pinfo = 1, | |
184 | #ifdef CONFIG_IPV6_ROUTER_PREF | |
185 | .accept_ra_rtr_pref = 1, | |
186 | .rtr_probe_interval = 60 * HZ, | |
187 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
188 | .accept_ra_rt_info_max_plen = 0, | |
189 | #endif | |
190 | #endif | |
191 | .proxy_ndp = 0, | |
192 | .accept_source_route = 0, /* we do not accept RH0 by default. */ | |
193 | .disable_ipv6 = 0, | |
194 | .accept_dad = 1, | |
195 | }; | |
196 | ||
197 | static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { | |
198 | .forwarding = 0, | |
199 | .hop_limit = IPV6_DEFAULT_HOPLIMIT, | |
200 | .mtu6 = IPV6_MIN_MTU, | |
201 | .accept_ra = 1, | |
202 | .accept_redirects = 1, | |
203 | .autoconf = 1, | |
204 | .dad_transmits = 1, | |
205 | .rtr_solicits = MAX_RTR_SOLICITATIONS, | |
206 | .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, | |
207 | .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, | |
208 | #ifdef CONFIG_IPV6_PRIVACY | |
209 | .use_tempaddr = 0, | |
210 | .temp_valid_lft = TEMP_VALID_LIFETIME, | |
211 | .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, | |
212 | .regen_max_retry = REGEN_MAX_RETRY, | |
213 | .max_desync_factor = MAX_DESYNC_FACTOR, | |
214 | #endif | |
215 | .max_addresses = IPV6_MAX_ADDRESSES, | |
216 | .accept_ra_defrtr = 1, | |
217 | .accept_ra_pinfo = 1, | |
218 | #ifdef CONFIG_IPV6_ROUTER_PREF | |
219 | .accept_ra_rtr_pref = 1, | |
220 | .rtr_probe_interval = 60 * HZ, | |
221 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
222 | .accept_ra_rt_info_max_plen = 0, | |
223 | #endif | |
224 | #endif | |
225 | .proxy_ndp = 0, | |
226 | .accept_source_route = 0, /* we do not accept RH0 by default. */ | |
227 | .disable_ipv6 = 0, | |
228 | .accept_dad = 1, | |
229 | }; | |
230 | ||
231 | /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ | |
232 | const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; | |
233 | const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; | |
234 | const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; | |
235 | const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; | |
236 | ||
237 | /* Check if a valid qdisc is available */ | |
238 | static inline bool addrconf_qdisc_ok(const struct net_device *dev) | |
239 | { | |
240 | return !qdisc_tx_is_noop(dev); | |
241 | } | |
242 | ||
243 | /* Check if a route is valid prefix route */ | |
244 | static inline int addrconf_is_prefix_route(const struct rt6_info *rt) | |
245 | { | |
246 | return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0); | |
247 | } | |
248 | ||
249 | static void addrconf_del_timer(struct inet6_ifaddr *ifp) | |
250 | { | |
251 | if (del_timer(&ifp->timer)) | |
252 | __in6_ifa_put(ifp); | |
253 | } | |
254 | ||
255 | enum addrconf_timer_t { | |
256 | AC_NONE, | |
257 | AC_DAD, | |
258 | AC_RS, | |
259 | }; | |
260 | ||
261 | static void addrconf_mod_timer(struct inet6_ifaddr *ifp, | |
262 | enum addrconf_timer_t what, | |
263 | unsigned long when) | |
264 | { | |
265 | if (!del_timer(&ifp->timer)) | |
266 | in6_ifa_hold(ifp); | |
267 | ||
268 | switch (what) { | |
269 | case AC_DAD: | |
270 | ifp->timer.function = addrconf_dad_timer; | |
271 | break; | |
272 | case AC_RS: | |
273 | ifp->timer.function = addrconf_rs_timer; | |
274 | break; | |
275 | default: | |
276 | break; | |
277 | } | |
278 | ifp->timer.expires = jiffies + when; | |
279 | add_timer(&ifp->timer); | |
280 | } | |
281 | ||
282 | static int snmp6_alloc_dev(struct inet6_dev *idev) | |
283 | { | |
284 | if (snmp_mib_init((void __percpu **)idev->stats.ipv6, | |
285 | sizeof(struct ipstats_mib), | |
286 | __alignof__(struct ipstats_mib)) < 0) | |
287 | goto err_ip; | |
288 | if (snmp_mib_init((void __percpu **)idev->stats.icmpv6, | |
289 | sizeof(struct icmpv6_mib), | |
290 | __alignof__(struct icmpv6_mib)) < 0) | |
291 | goto err_icmp; | |
292 | if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg, | |
293 | sizeof(struct icmpv6msg_mib), | |
294 | __alignof__(struct icmpv6msg_mib)) < 0) | |
295 | goto err_icmpmsg; | |
296 | ||
297 | return 0; | |
298 | ||
299 | err_icmpmsg: | |
300 | snmp_mib_free((void __percpu **)idev->stats.icmpv6); | |
301 | err_icmp: | |
302 | snmp_mib_free((void __percpu **)idev->stats.ipv6); | |
303 | err_ip: | |
304 | return -ENOMEM; | |
305 | } | |
306 | ||
307 | static void snmp6_free_dev(struct inet6_dev *idev) | |
308 | { | |
309 | snmp_mib_free((void __percpu **)idev->stats.icmpv6msg); | |
310 | snmp_mib_free((void __percpu **)idev->stats.icmpv6); | |
311 | snmp_mib_free((void __percpu **)idev->stats.ipv6); | |
312 | } | |
313 | ||
314 | /* Nobody refers to this device, we may destroy it. */ | |
315 | ||
316 | static void in6_dev_finish_destroy_rcu(struct rcu_head *head) | |
317 | { | |
318 | struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); | |
319 | kfree(idev); | |
320 | } | |
321 | ||
322 | void in6_dev_finish_destroy(struct inet6_dev *idev) | |
323 | { | |
324 | struct net_device *dev = idev->dev; | |
325 | ||
326 | WARN_ON(!list_empty(&idev->addr_list)); | |
327 | WARN_ON(idev->mc_list != NULL); | |
328 | ||
329 | #ifdef NET_REFCNT_DEBUG | |
330 | printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); | |
331 | #endif | |
332 | dev_put(dev); | |
333 | if (!idev->dead) { | |
334 | pr_warning("Freeing alive inet6 device %p\n", idev); | |
335 | return; | |
336 | } | |
337 | snmp6_free_dev(idev); | |
338 | call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); | |
339 | } | |
340 | ||
341 | EXPORT_SYMBOL(in6_dev_finish_destroy); | |
342 | ||
343 | static struct inet6_dev * ipv6_add_dev(struct net_device *dev) | |
344 | { | |
345 | struct inet6_dev *ndev; | |
346 | ||
347 | ASSERT_RTNL(); | |
348 | ||
349 | if (dev->mtu < IPV6_MIN_MTU) | |
350 | return NULL; | |
351 | ||
352 | ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); | |
353 | ||
354 | if (ndev == NULL) | |
355 | return NULL; | |
356 | ||
357 | rwlock_init(&ndev->lock); | |
358 | ndev->dev = dev; | |
359 | INIT_LIST_HEAD(&ndev->addr_list); | |
360 | ||
361 | memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); | |
362 | ndev->cnf.mtu6 = dev->mtu; | |
363 | ndev->cnf.sysctl = NULL; | |
364 | ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); | |
365 | if (ndev->nd_parms == NULL) { | |
366 | kfree(ndev); | |
367 | return NULL; | |
368 | } | |
369 | if (ndev->cnf.forwarding) | |
370 | dev_disable_lro(dev); | |
371 | /* We refer to the device */ | |
372 | dev_hold(dev); | |
373 | ||
374 | if (snmp6_alloc_dev(ndev) < 0) { | |
375 | ADBG((KERN_WARNING | |
376 | "%s(): cannot allocate memory for statistics; dev=%s.\n", | |
377 | __func__, dev->name)); | |
378 | neigh_parms_release(&nd_tbl, ndev->nd_parms); | |
379 | ndev->dead = 1; | |
380 | in6_dev_finish_destroy(ndev); | |
381 | return NULL; | |
382 | } | |
383 | ||
384 | if (snmp6_register_dev(ndev) < 0) { | |
385 | ADBG((KERN_WARNING | |
386 | "%s(): cannot create /proc/net/dev_snmp6/%s\n", | |
387 | __func__, dev->name)); | |
388 | neigh_parms_release(&nd_tbl, ndev->nd_parms); | |
389 | ndev->dead = 1; | |
390 | in6_dev_finish_destroy(ndev); | |
391 | return NULL; | |
392 | } | |
393 | ||
394 | /* One reference from device. We must do this before | |
395 | * we invoke __ipv6_regen_rndid(). | |
396 | */ | |
397 | in6_dev_hold(ndev); | |
398 | ||
399 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
400 | ndev->cnf.accept_dad = -1; | |
401 | ||
402 | #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) | |
403 | if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { | |
404 | printk(KERN_INFO | |
405 | "%s: Disabled Multicast RS\n", | |
406 | dev->name); | |
407 | ndev->cnf.rtr_solicits = 0; | |
408 | } | |
409 | #endif | |
410 | ||
411 | #ifdef CONFIG_IPV6_PRIVACY | |
412 | INIT_LIST_HEAD(&ndev->tempaddr_list); | |
413 | setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); | |
414 | if ((dev->flags&IFF_LOOPBACK) || | |
415 | dev->type == ARPHRD_TUNNEL || | |
416 | dev->type == ARPHRD_TUNNEL6 || | |
417 | dev->type == ARPHRD_SIT || | |
418 | dev->type == ARPHRD_NONE) { | |
419 | printk(KERN_INFO | |
420 | "%s: Disabled Privacy Extensions\n", | |
421 | dev->name); | |
422 | ndev->cnf.use_tempaddr = -1; | |
423 | } else { | |
424 | in6_dev_hold(ndev); | |
425 | ipv6_regen_rndid((unsigned long) ndev); | |
426 | } | |
427 | #endif | |
428 | ||
429 | if (netif_running(dev) && addrconf_qdisc_ok(dev)) | |
430 | ndev->if_flags |= IF_READY; | |
431 | ||
432 | ipv6_mc_init_dev(ndev); | |
433 | ndev->tstamp = jiffies; | |
434 | addrconf_sysctl_register(ndev); | |
435 | /* protected by rtnl_lock */ | |
436 | rcu_assign_pointer(dev->ip6_ptr, ndev); | |
437 | ||
438 | /* Join all-node multicast group */ | |
439 | ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); | |
440 | ||
441 | return ndev; | |
442 | } | |
443 | ||
444 | static struct inet6_dev * ipv6_find_idev(struct net_device *dev) | |
445 | { | |
446 | struct inet6_dev *idev; | |
447 | ||
448 | ASSERT_RTNL(); | |
449 | ||
450 | idev = __in6_dev_get(dev); | |
451 | if (!idev) { | |
452 | idev = ipv6_add_dev(dev); | |
453 | if (!idev) | |
454 | return NULL; | |
455 | } | |
456 | ||
457 | if (dev->flags&IFF_UP) | |
458 | ipv6_mc_up(idev); | |
459 | return idev; | |
460 | } | |
461 | ||
462 | #ifdef CONFIG_SYSCTL | |
463 | static void dev_forward_change(struct inet6_dev *idev) | |
464 | { | |
465 | struct net_device *dev; | |
466 | struct inet6_ifaddr *ifa; | |
467 | ||
468 | if (!idev) | |
469 | return; | |
470 | dev = idev->dev; | |
471 | if (idev->cnf.forwarding) | |
472 | dev_disable_lro(dev); | |
473 | if (dev && (dev->flags & IFF_MULTICAST)) { | |
474 | if (idev->cnf.forwarding) | |
475 | ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); | |
476 | else | |
477 | ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); | |
478 | } | |
479 | ||
480 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
481 | if (ifa->flags&IFA_F_TENTATIVE) | |
482 | continue; | |
483 | if (idev->cnf.forwarding) | |
484 | addrconf_join_anycast(ifa); | |
485 | else | |
486 | addrconf_leave_anycast(ifa); | |
487 | } | |
488 | } | |
489 | ||
490 | ||
491 | static void addrconf_forward_change(struct net *net, __s32 newf) | |
492 | { | |
493 | struct net_device *dev; | |
494 | struct inet6_dev *idev; | |
495 | ||
496 | rcu_read_lock(); | |
497 | for_each_netdev_rcu(net, dev) { | |
498 | idev = __in6_dev_get(dev); | |
499 | if (idev) { | |
500 | int changed = (!idev->cnf.forwarding) ^ (!newf); | |
501 | idev->cnf.forwarding = newf; | |
502 | if (changed) | |
503 | dev_forward_change(idev); | |
504 | } | |
505 | } | |
506 | rcu_read_unlock(); | |
507 | } | |
508 | ||
509 | static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) | |
510 | { | |
511 | struct net *net; | |
512 | ||
513 | net = (struct net *)table->extra2; | |
514 | if (p == &net->ipv6.devconf_dflt->forwarding) | |
515 | return 0; | |
516 | ||
517 | if (!rtnl_trylock()) { | |
518 | /* Restore the original values before restarting */ | |
519 | *p = old; | |
520 | return restart_syscall(); | |
521 | } | |
522 | ||
523 | if (p == &net->ipv6.devconf_all->forwarding) { | |
524 | __s32 newf = net->ipv6.devconf_all->forwarding; | |
525 | net->ipv6.devconf_dflt->forwarding = newf; | |
526 | addrconf_forward_change(net, newf); | |
527 | } else if ((!*p) ^ (!old)) | |
528 | dev_forward_change((struct inet6_dev *)table->extra1); | |
529 | rtnl_unlock(); | |
530 | ||
531 | if (*p) | |
532 | rt6_purge_dflt_routers(net); | |
533 | return 1; | |
534 | } | |
535 | #endif | |
536 | ||
537 | static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head) | |
538 | { | |
539 | struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu); | |
540 | kfree(ifp); | |
541 | } | |
542 | ||
543 | /* Nobody refers to this ifaddr, destroy it */ | |
544 | void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) | |
545 | { | |
546 | WARN_ON(!hlist_unhashed(&ifp->addr_lst)); | |
547 | ||
548 | #ifdef NET_REFCNT_DEBUG | |
549 | printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); | |
550 | #endif | |
551 | ||
552 | in6_dev_put(ifp->idev); | |
553 | ||
554 | if (del_timer(&ifp->timer)) | |
555 | pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); | |
556 | ||
557 | if (ifp->state != INET6_IFADDR_STATE_DEAD) { | |
558 | pr_warning("Freeing alive inet6 address %p\n", ifp); | |
559 | return; | |
560 | } | |
561 | dst_release(&ifp->rt->dst); | |
562 | ||
563 | call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu); | |
564 | } | |
565 | ||
566 | static void | |
567 | ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) | |
568 | { | |
569 | struct list_head *p; | |
570 | int ifp_scope = ipv6_addr_src_scope(&ifp->addr); | |
571 | ||
572 | /* | |
573 | * Each device address list is sorted in order of scope - | |
574 | * global before linklocal. | |
575 | */ | |
576 | list_for_each(p, &idev->addr_list) { | |
577 | struct inet6_ifaddr *ifa | |
578 | = list_entry(p, struct inet6_ifaddr, if_list); | |
579 | if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) | |
580 | break; | |
581 | } | |
582 | ||
583 | list_add_tail(&ifp->if_list, p); | |
584 | } | |
585 | ||
586 | static u32 ipv6_addr_hash(const struct in6_addr *addr) | |
587 | { | |
588 | /* | |
589 | * We perform the hash function over the last 64 bits of the address | |
590 | * This will include the IEEE address token on links that support it. | |
591 | */ | |
592 | return jhash_2words((__force u32)addr->s6_addr32[2], | |
593 | (__force u32)addr->s6_addr32[3], 0) | |
594 | & (IN6_ADDR_HSIZE - 1); | |
595 | } | |
596 | ||
597 | /* On success it returns ifp with increased reference count */ | |
598 | ||
599 | static struct inet6_ifaddr * | |
600 | ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, | |
601 | int scope, u32 flags) | |
602 | { | |
603 | struct inet6_ifaddr *ifa = NULL; | |
604 | struct rt6_info *rt; | |
605 | unsigned int hash; | |
606 | int err = 0; | |
607 | int addr_type = ipv6_addr_type(addr); | |
608 | ||
609 | if (addr_type == IPV6_ADDR_ANY || | |
610 | addr_type & IPV6_ADDR_MULTICAST || | |
611 | (!(idev->dev->flags & IFF_LOOPBACK) && | |
612 | addr_type & IPV6_ADDR_LOOPBACK)) | |
613 | return ERR_PTR(-EADDRNOTAVAIL); | |
614 | ||
615 | rcu_read_lock_bh(); | |
616 | if (idev->dead) { | |
617 | err = -ENODEV; /*XXX*/ | |
618 | goto out2; | |
619 | } | |
620 | ||
621 | if (idev->cnf.disable_ipv6) { | |
622 | err = -EACCES; | |
623 | goto out2; | |
624 | } | |
625 | ||
626 | spin_lock(&addrconf_hash_lock); | |
627 | ||
628 | /* Ignore adding duplicate addresses on an interface */ | |
629 | if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { | |
630 | ADBG(("ipv6_add_addr: already assigned\n")); | |
631 | err = -EEXIST; | |
632 | goto out; | |
633 | } | |
634 | ||
635 | ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); | |
636 | ||
637 | if (ifa == NULL) { | |
638 | ADBG(("ipv6_add_addr: malloc failed\n")); | |
639 | err = -ENOBUFS; | |
640 | goto out; | |
641 | } | |
642 | ||
643 | rt = addrconf_dst_alloc(idev, addr, 0); | |
644 | if (IS_ERR(rt)) { | |
645 | err = PTR_ERR(rt); | |
646 | goto out; | |
647 | } | |
648 | ||
649 | ipv6_addr_copy(&ifa->addr, addr); | |
650 | ||
651 | spin_lock_init(&ifa->lock); | |
652 | spin_lock_init(&ifa->state_lock); | |
653 | init_timer(&ifa->timer); | |
654 | INIT_HLIST_NODE(&ifa->addr_lst); | |
655 | ifa->timer.data = (unsigned long) ifa; | |
656 | ifa->scope = scope; | |
657 | ifa->prefix_len = pfxlen; | |
658 | ifa->flags = flags | IFA_F_TENTATIVE; | |
659 | ifa->cstamp = ifa->tstamp = jiffies; | |
660 | ||
661 | ifa->rt = rt; | |
662 | ||
663 | /* | |
664 | * part one of RFC 4429, section 3.3 | |
665 | * We should not configure an address as | |
666 | * optimistic if we do not yet know the link | |
667 | * layer address of our nexhop router | |
668 | */ | |
669 | ||
670 | if (rt->rt6i_nexthop == NULL) | |
671 | ifa->flags &= ~IFA_F_OPTIMISTIC; | |
672 | ||
673 | ifa->idev = idev; | |
674 | in6_dev_hold(idev); | |
675 | /* For caller */ | |
676 | in6_ifa_hold(ifa); | |
677 | ||
678 | /* Add to big hash table */ | |
679 | hash = ipv6_addr_hash(addr); | |
680 | ||
681 | hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); | |
682 | spin_unlock(&addrconf_hash_lock); | |
683 | ||
684 | write_lock(&idev->lock); | |
685 | /* Add to inet6_dev unicast addr list. */ | |
686 | ipv6_link_dev_addr(idev, ifa); | |
687 | ||
688 | #ifdef CONFIG_IPV6_PRIVACY | |
689 | if (ifa->flags&IFA_F_TEMPORARY) { | |
690 | list_add(&ifa->tmp_list, &idev->tempaddr_list); | |
691 | in6_ifa_hold(ifa); | |
692 | } | |
693 | #endif | |
694 | ||
695 | in6_ifa_hold(ifa); | |
696 | write_unlock(&idev->lock); | |
697 | out2: | |
698 | rcu_read_unlock_bh(); | |
699 | ||
700 | if (likely(err == 0)) | |
701 | atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); | |
702 | else { | |
703 | kfree(ifa); | |
704 | ifa = ERR_PTR(err); | |
705 | } | |
706 | ||
707 | return ifa; | |
708 | out: | |
709 | spin_unlock(&addrconf_hash_lock); | |
710 | goto out2; | |
711 | } | |
712 | ||
713 | /* This function wants to get referenced ifp and releases it before return */ | |
714 | ||
715 | static void ipv6_del_addr(struct inet6_ifaddr *ifp) | |
716 | { | |
717 | struct inet6_ifaddr *ifa, *ifn; | |
718 | struct inet6_dev *idev = ifp->idev; | |
719 | int state; | |
720 | int hash; | |
721 | int deleted = 0, onlink = 0; | |
722 | unsigned long expires = jiffies; | |
723 | ||
724 | hash = ipv6_addr_hash(&ifp->addr); | |
725 | ||
726 | spin_lock_bh(&ifp->state_lock); | |
727 | state = ifp->state; | |
728 | ifp->state = INET6_IFADDR_STATE_DEAD; | |
729 | spin_unlock_bh(&ifp->state_lock); | |
730 | ||
731 | if (state == INET6_IFADDR_STATE_DEAD) | |
732 | goto out; | |
733 | ||
734 | spin_lock_bh(&addrconf_hash_lock); | |
735 | hlist_del_init_rcu(&ifp->addr_lst); | |
736 | spin_unlock_bh(&addrconf_hash_lock); | |
737 | ||
738 | write_lock_bh(&idev->lock); | |
739 | #ifdef CONFIG_IPV6_PRIVACY | |
740 | if (ifp->flags&IFA_F_TEMPORARY) { | |
741 | list_del(&ifp->tmp_list); | |
742 | if (ifp->ifpub) { | |
743 | in6_ifa_put(ifp->ifpub); | |
744 | ifp->ifpub = NULL; | |
745 | } | |
746 | __in6_ifa_put(ifp); | |
747 | } | |
748 | #endif | |
749 | ||
750 | list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { | |
751 | if (ifa == ifp) { | |
752 | list_del_init(&ifp->if_list); | |
753 | __in6_ifa_put(ifp); | |
754 | ||
755 | if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) | |
756 | break; | |
757 | deleted = 1; | |
758 | continue; | |
759 | } else if (ifp->flags & IFA_F_PERMANENT) { | |
760 | if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, | |
761 | ifp->prefix_len)) { | |
762 | if (ifa->flags & IFA_F_PERMANENT) { | |
763 | onlink = 1; | |
764 | if (deleted) | |
765 | break; | |
766 | } else { | |
767 | unsigned long lifetime; | |
768 | ||
769 | if (!onlink) | |
770 | onlink = -1; | |
771 | ||
772 | spin_lock(&ifa->lock); | |
773 | ||
774 | lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); | |
775 | /* | |
776 | * Note: Because this address is | |
777 | * not permanent, lifetime < | |
778 | * LONG_MAX / HZ here. | |
779 | */ | |
780 | if (time_before(expires, | |
781 | ifa->tstamp + lifetime * HZ)) | |
782 | expires = ifa->tstamp + lifetime * HZ; | |
783 | spin_unlock(&ifa->lock); | |
784 | } | |
785 | } | |
786 | } | |
787 | } | |
788 | write_unlock_bh(&idev->lock); | |
789 | ||
790 | addrconf_del_timer(ifp); | |
791 | ||
792 | ipv6_ifa_notify(RTM_DELADDR, ifp); | |
793 | ||
794 | atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); | |
795 | ||
796 | /* | |
797 | * Purge or update corresponding prefix | |
798 | * | |
799 | * 1) we don't purge prefix here if address was not permanent. | |
800 | * prefix is managed by its own lifetime. | |
801 | * 2) if there're no addresses, delete prefix. | |
802 | * 3) if there're still other permanent address(es), | |
803 | * corresponding prefix is still permanent. | |
804 | * 4) otherwise, update prefix lifetime to the | |
805 | * longest valid lifetime among the corresponding | |
806 | * addresses on the device. | |
807 | * Note: subsequent RA will update lifetime. | |
808 | * | |
809 | * --yoshfuji | |
810 | */ | |
811 | if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { | |
812 | struct in6_addr prefix; | |
813 | struct rt6_info *rt; | |
814 | struct net *net = dev_net(ifp->idev->dev); | |
815 | ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); | |
816 | rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); | |
817 | ||
818 | if (rt && addrconf_is_prefix_route(rt)) { | |
819 | if (onlink == 0) { | |
820 | ip6_del_rt(rt); | |
821 | rt = NULL; | |
822 | } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { | |
823 | rt->rt6i_expires = expires; | |
824 | rt->rt6i_flags |= RTF_EXPIRES; | |
825 | } | |
826 | } | |
827 | dst_release(&rt->dst); | |
828 | } | |
829 | ||
830 | out: | |
831 | in6_ifa_put(ifp); | |
832 | } | |
833 | ||
834 | #ifdef CONFIG_IPV6_PRIVACY | |
835 | static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) | |
836 | { | |
837 | struct inet6_dev *idev = ifp->idev; | |
838 | struct in6_addr addr, *tmpaddr; | |
839 | unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; | |
840 | unsigned long regen_advance; | |
841 | int tmp_plen; | |
842 | int ret = 0; | |
843 | int max_addresses; | |
844 | u32 addr_flags; | |
845 | ||
846 | write_lock(&idev->lock); | |
847 | if (ift) { | |
848 | spin_lock_bh(&ift->lock); | |
849 | memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); | |
850 | spin_unlock_bh(&ift->lock); | |
851 | tmpaddr = &addr; | |
852 | } else { | |
853 | tmpaddr = NULL; | |
854 | } | |
855 | retry: | |
856 | in6_dev_hold(idev); | |
857 | if (idev->cnf.use_tempaddr <= 0) { | |
858 | write_unlock(&idev->lock); | |
859 | printk(KERN_INFO | |
860 | "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); | |
861 | in6_dev_put(idev); | |
862 | ret = -1; | |
863 | goto out; | |
864 | } | |
865 | spin_lock_bh(&ifp->lock); | |
866 | if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { | |
867 | idev->cnf.use_tempaddr = -1; /*XXX*/ | |
868 | spin_unlock_bh(&ifp->lock); | |
869 | write_unlock(&idev->lock); | |
870 | printk(KERN_WARNING | |
871 | "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); | |
872 | in6_dev_put(idev); | |
873 | ret = -1; | |
874 | goto out; | |
875 | } | |
876 | in6_ifa_hold(ifp); | |
877 | memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); | |
878 | if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { | |
879 | spin_unlock_bh(&ifp->lock); | |
880 | write_unlock(&idev->lock); | |
881 | printk(KERN_WARNING | |
882 | "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); | |
883 | in6_ifa_put(ifp); | |
884 | in6_dev_put(idev); | |
885 | ret = -1; | |
886 | goto out; | |
887 | } | |
888 | memcpy(&addr.s6_addr[8], idev->rndid, 8); | |
889 | tmp_valid_lft = min_t(__u32, | |
890 | ifp->valid_lft, | |
891 | idev->cnf.temp_valid_lft); | |
892 | tmp_prefered_lft = min_t(__u32, | |
893 | ifp->prefered_lft, | |
894 | idev->cnf.temp_prefered_lft - | |
895 | idev->cnf.max_desync_factor); | |
896 | tmp_plen = ifp->prefix_len; | |
897 | max_addresses = idev->cnf.max_addresses; | |
898 | tmp_cstamp = ifp->cstamp; | |
899 | tmp_tstamp = ifp->tstamp; | |
900 | spin_unlock_bh(&ifp->lock); | |
901 | ||
902 | regen_advance = idev->cnf.regen_max_retry * | |
903 | idev->cnf.dad_transmits * | |
904 | idev->nd_parms->retrans_time / HZ; | |
905 | write_unlock(&idev->lock); | |
906 | ||
907 | /* A temporary address is created only if this calculated Preferred | |
908 | * Lifetime is greater than REGEN_ADVANCE time units. In particular, | |
909 | * an implementation must not create a temporary address with a zero | |
910 | * Preferred Lifetime. | |
911 | */ | |
912 | if (tmp_prefered_lft <= regen_advance) { | |
913 | in6_ifa_put(ifp); | |
914 | in6_dev_put(idev); | |
915 | ret = -1; | |
916 | goto out; | |
917 | } | |
918 | ||
919 | addr_flags = IFA_F_TEMPORARY; | |
920 | /* set in addrconf_prefix_rcv() */ | |
921 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
922 | addr_flags |= IFA_F_OPTIMISTIC; | |
923 | ||
924 | ift = !max_addresses || | |
925 | ipv6_count_addresses(idev) < max_addresses ? | |
926 | ipv6_add_addr(idev, &addr, tmp_plen, | |
927 | ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, | |
928 | addr_flags) : NULL; | |
929 | if (!ift || IS_ERR(ift)) { | |
930 | in6_ifa_put(ifp); | |
931 | in6_dev_put(idev); | |
932 | printk(KERN_INFO | |
933 | "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); | |
934 | tmpaddr = &addr; | |
935 | write_lock(&idev->lock); | |
936 | goto retry; | |
937 | } | |
938 | ||
939 | spin_lock_bh(&ift->lock); | |
940 | ift->ifpub = ifp; | |
941 | ift->valid_lft = tmp_valid_lft; | |
942 | ift->prefered_lft = tmp_prefered_lft; | |
943 | ift->cstamp = tmp_cstamp; | |
944 | ift->tstamp = tmp_tstamp; | |
945 | spin_unlock_bh(&ift->lock); | |
946 | ||
947 | addrconf_dad_start(ift, 0); | |
948 | in6_ifa_put(ift); | |
949 | in6_dev_put(idev); | |
950 | out: | |
951 | return ret; | |
952 | } | |
953 | #endif | |
954 | ||
955 | /* | |
956 | * Choose an appropriate source address (RFC3484) | |
957 | */ | |
958 | enum { | |
959 | IPV6_SADDR_RULE_INIT = 0, | |
960 | IPV6_SADDR_RULE_LOCAL, | |
961 | IPV6_SADDR_RULE_SCOPE, | |
962 | IPV6_SADDR_RULE_PREFERRED, | |
963 | #ifdef CONFIG_IPV6_MIP6 | |
964 | IPV6_SADDR_RULE_HOA, | |
965 | #endif | |
966 | IPV6_SADDR_RULE_OIF, | |
967 | IPV6_SADDR_RULE_LABEL, | |
968 | #ifdef CONFIG_IPV6_PRIVACY | |
969 | IPV6_SADDR_RULE_PRIVACY, | |
970 | #endif | |
971 | IPV6_SADDR_RULE_ORCHID, | |
972 | IPV6_SADDR_RULE_PREFIX, | |
973 | IPV6_SADDR_RULE_MAX | |
974 | }; | |
975 | ||
976 | struct ipv6_saddr_score { | |
977 | int rule; | |
978 | int addr_type; | |
979 | struct inet6_ifaddr *ifa; | |
980 | DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); | |
981 | int scopedist; | |
982 | int matchlen; | |
983 | }; | |
984 | ||
985 | struct ipv6_saddr_dst { | |
986 | const struct in6_addr *addr; | |
987 | int ifindex; | |
988 | int scope; | |
989 | int label; | |
990 | unsigned int prefs; | |
991 | }; | |
992 | ||
993 | static inline int ipv6_saddr_preferred(int type) | |
994 | { | |
995 | if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) | |
996 | return 1; | |
997 | return 0; | |
998 | } | |
999 | ||
1000 | static int ipv6_get_saddr_eval(struct net *net, | |
1001 | struct ipv6_saddr_score *score, | |
1002 | struct ipv6_saddr_dst *dst, | |
1003 | int i) | |
1004 | { | |
1005 | int ret; | |
1006 | ||
1007 | if (i <= score->rule) { | |
1008 | switch (i) { | |
1009 | case IPV6_SADDR_RULE_SCOPE: | |
1010 | ret = score->scopedist; | |
1011 | break; | |
1012 | case IPV6_SADDR_RULE_PREFIX: | |
1013 | ret = score->matchlen; | |
1014 | break; | |
1015 | default: | |
1016 | ret = !!test_bit(i, score->scorebits); | |
1017 | } | |
1018 | goto out; | |
1019 | } | |
1020 | ||
1021 | switch (i) { | |
1022 | case IPV6_SADDR_RULE_INIT: | |
1023 | /* Rule 0: remember if hiscore is not ready yet */ | |
1024 | ret = !!score->ifa; | |
1025 | break; | |
1026 | case IPV6_SADDR_RULE_LOCAL: | |
1027 | /* Rule 1: Prefer same address */ | |
1028 | ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); | |
1029 | break; | |
1030 | case IPV6_SADDR_RULE_SCOPE: | |
1031 | /* Rule 2: Prefer appropriate scope | |
1032 | * | |
1033 | * ret | |
1034 | * ^ | |
1035 | * -1 | d 15 | |
1036 | * ---+--+-+---> scope | |
1037 | * | | |
1038 | * | d is scope of the destination. | |
1039 | * B-d | \ | |
1040 | * | \ <- smaller scope is better if | |
1041 | * B-15 | \ if scope is enough for destinaion. | |
1042 | * | ret = B - scope (-1 <= scope >= d <= 15). | |
1043 | * d-C-1 | / | |
1044 | * |/ <- greater is better | |
1045 | * -C / if scope is not enough for destination. | |
1046 | * /| ret = scope - C (-1 <= d < scope <= 15). | |
1047 | * | |
1048 | * d - C - 1 < B -15 (for all -1 <= d <= 15). | |
1049 | * C > d + 14 - B >= 15 + 14 - B = 29 - B. | |
1050 | * Assume B = 0 and we get C > 29. | |
1051 | */ | |
1052 | ret = __ipv6_addr_src_scope(score->addr_type); | |
1053 | if (ret >= dst->scope) | |
1054 | ret = -ret; | |
1055 | else | |
1056 | ret -= 128; /* 30 is enough */ | |
1057 | score->scopedist = ret; | |
1058 | break; | |
1059 | case IPV6_SADDR_RULE_PREFERRED: | |
1060 | /* Rule 3: Avoid deprecated and optimistic addresses */ | |
1061 | ret = ipv6_saddr_preferred(score->addr_type) || | |
1062 | !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); | |
1063 | break; | |
1064 | #ifdef CONFIG_IPV6_MIP6 | |
1065 | case IPV6_SADDR_RULE_HOA: | |
1066 | { | |
1067 | /* Rule 4: Prefer home address */ | |
1068 | int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); | |
1069 | ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; | |
1070 | break; | |
1071 | } | |
1072 | #endif | |
1073 | case IPV6_SADDR_RULE_OIF: | |
1074 | /* Rule 5: Prefer outgoing interface */ | |
1075 | ret = (!dst->ifindex || | |
1076 | dst->ifindex == score->ifa->idev->dev->ifindex); | |
1077 | break; | |
1078 | case IPV6_SADDR_RULE_LABEL: | |
1079 | /* Rule 6: Prefer matching label */ | |
1080 | ret = ipv6_addr_label(net, | |
1081 | &score->ifa->addr, score->addr_type, | |
1082 | score->ifa->idev->dev->ifindex) == dst->label; | |
1083 | break; | |
1084 | #ifdef CONFIG_IPV6_PRIVACY | |
1085 | case IPV6_SADDR_RULE_PRIVACY: | |
1086 | { | |
1087 | /* Rule 7: Prefer public address | |
1088 | * Note: prefer temprary address if use_tempaddr >= 2 | |
1089 | */ | |
1090 | int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? | |
1091 | !!(dst->prefs & IPV6_PREFER_SRC_TMP) : | |
1092 | score->ifa->idev->cnf.use_tempaddr >= 2; | |
1093 | ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; | |
1094 | break; | |
1095 | } | |
1096 | #endif | |
1097 | case IPV6_SADDR_RULE_ORCHID: | |
1098 | /* Rule 8-: Prefer ORCHID vs ORCHID or | |
1099 | * non-ORCHID vs non-ORCHID | |
1100 | */ | |
1101 | ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ | |
1102 | ipv6_addr_orchid(dst->addr)); | |
1103 | break; | |
1104 | case IPV6_SADDR_RULE_PREFIX: | |
1105 | /* Rule 8: Use longest matching prefix */ | |
1106 | score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, | |
1107 | dst->addr); | |
1108 | break; | |
1109 | default: | |
1110 | ret = 0; | |
1111 | } | |
1112 | ||
1113 | if (ret) | |
1114 | __set_bit(i, score->scorebits); | |
1115 | score->rule = i; | |
1116 | out: | |
1117 | return ret; | |
1118 | } | |
1119 | ||
1120 | int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, | |
1121 | const struct in6_addr *daddr, unsigned int prefs, | |
1122 | struct in6_addr *saddr) | |
1123 | { | |
1124 | struct ipv6_saddr_score scores[2], | |
1125 | *score = &scores[0], *hiscore = &scores[1]; | |
1126 | struct ipv6_saddr_dst dst; | |
1127 | struct net_device *dev; | |
1128 | int dst_type; | |
1129 | ||
1130 | dst_type = __ipv6_addr_type(daddr); | |
1131 | dst.addr = daddr; | |
1132 | dst.ifindex = dst_dev ? dst_dev->ifindex : 0; | |
1133 | dst.scope = __ipv6_addr_src_scope(dst_type); | |
1134 | dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); | |
1135 | dst.prefs = prefs; | |
1136 | ||
1137 | hiscore->rule = -1; | |
1138 | hiscore->ifa = NULL; | |
1139 | ||
1140 | rcu_read_lock(); | |
1141 | ||
1142 | for_each_netdev_rcu(net, dev) { | |
1143 | struct inet6_dev *idev; | |
1144 | ||
1145 | /* Candidate Source Address (section 4) | |
1146 | * - multicast and link-local destination address, | |
1147 | * the set of candidate source address MUST only | |
1148 | * include addresses assigned to interfaces | |
1149 | * belonging to the same link as the outgoing | |
1150 | * interface. | |
1151 | * (- For site-local destination addresses, the | |
1152 | * set of candidate source addresses MUST only | |
1153 | * include addresses assigned to interfaces | |
1154 | * belonging to the same site as the outgoing | |
1155 | * interface.) | |
1156 | */ | |
1157 | if (((dst_type & IPV6_ADDR_MULTICAST) || | |
1158 | dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && | |
1159 | dst.ifindex && dev->ifindex != dst.ifindex) | |
1160 | continue; | |
1161 | ||
1162 | idev = __in6_dev_get(dev); | |
1163 | if (!idev) | |
1164 | continue; | |
1165 | ||
1166 | read_lock_bh(&idev->lock); | |
1167 | list_for_each_entry(score->ifa, &idev->addr_list, if_list) { | |
1168 | int i; | |
1169 | ||
1170 | /* | |
1171 | * - Tentative Address (RFC2462 section 5.4) | |
1172 | * - A tentative address is not considered | |
1173 | * "assigned to an interface" in the traditional | |
1174 | * sense, unless it is also flagged as optimistic. | |
1175 | * - Candidate Source Address (section 4) | |
1176 | * - In any case, anycast addresses, multicast | |
1177 | * addresses, and the unspecified address MUST | |
1178 | * NOT be included in a candidate set. | |
1179 | */ | |
1180 | if ((score->ifa->flags & IFA_F_TENTATIVE) && | |
1181 | (!(score->ifa->flags & IFA_F_OPTIMISTIC))) | |
1182 | continue; | |
1183 | ||
1184 | score->addr_type = __ipv6_addr_type(&score->ifa->addr); | |
1185 | ||
1186 | if (unlikely(score->addr_type == IPV6_ADDR_ANY || | |
1187 | score->addr_type & IPV6_ADDR_MULTICAST)) { | |
1188 | LIMIT_NETDEBUG(KERN_DEBUG | |
1189 | "ADDRCONF: unspecified / multicast address " | |
1190 | "assigned as unicast address on %s", | |
1191 | dev->name); | |
1192 | continue; | |
1193 | } | |
1194 | ||
1195 | score->rule = -1; | |
1196 | bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); | |
1197 | ||
1198 | for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { | |
1199 | int minihiscore, miniscore; | |
1200 | ||
1201 | minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); | |
1202 | miniscore = ipv6_get_saddr_eval(net, score, &dst, i); | |
1203 | ||
1204 | if (minihiscore > miniscore) { | |
1205 | if (i == IPV6_SADDR_RULE_SCOPE && | |
1206 | score->scopedist > 0) { | |
1207 | /* | |
1208 | * special case: | |
1209 | * each remaining entry | |
1210 | * has too small (not enough) | |
1211 | * scope, because ifa entries | |
1212 | * are sorted by their scope | |
1213 | * values. | |
1214 | */ | |
1215 | goto try_nextdev; | |
1216 | } | |
1217 | break; | |
1218 | } else if (minihiscore < miniscore) { | |
1219 | if (hiscore->ifa) | |
1220 | in6_ifa_put(hiscore->ifa); | |
1221 | ||
1222 | in6_ifa_hold(score->ifa); | |
1223 | ||
1224 | swap(hiscore, score); | |
1225 | ||
1226 | /* restore our iterator */ | |
1227 | score->ifa = hiscore->ifa; | |
1228 | ||
1229 | break; | |
1230 | } | |
1231 | } | |
1232 | } | |
1233 | try_nextdev: | |
1234 | read_unlock_bh(&idev->lock); | |
1235 | } | |
1236 | rcu_read_unlock(); | |
1237 | ||
1238 | if (!hiscore->ifa) | |
1239 | return -EADDRNOTAVAIL; | |
1240 | ||
1241 | ipv6_addr_copy(saddr, &hiscore->ifa->addr); | |
1242 | in6_ifa_put(hiscore->ifa); | |
1243 | return 0; | |
1244 | } | |
1245 | EXPORT_SYMBOL(ipv6_dev_get_saddr); | |
1246 | ||
1247 | int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, | |
1248 | unsigned char banned_flags) | |
1249 | { | |
1250 | struct inet6_dev *idev; | |
1251 | int err = -EADDRNOTAVAIL; | |
1252 | ||
1253 | rcu_read_lock(); | |
1254 | idev = __in6_dev_get(dev); | |
1255 | if (idev) { | |
1256 | struct inet6_ifaddr *ifp; | |
1257 | ||
1258 | read_lock_bh(&idev->lock); | |
1259 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
1260 | if (ifp->scope == IFA_LINK && | |
1261 | !(ifp->flags & banned_flags)) { | |
1262 | ipv6_addr_copy(addr, &ifp->addr); | |
1263 | err = 0; | |
1264 | break; | |
1265 | } | |
1266 | } | |
1267 | read_unlock_bh(&idev->lock); | |
1268 | } | |
1269 | rcu_read_unlock(); | |
1270 | return err; | |
1271 | } | |
1272 | ||
1273 | static int ipv6_count_addresses(struct inet6_dev *idev) | |
1274 | { | |
1275 | int cnt = 0; | |
1276 | struct inet6_ifaddr *ifp; | |
1277 | ||
1278 | read_lock_bh(&idev->lock); | |
1279 | list_for_each_entry(ifp, &idev->addr_list, if_list) | |
1280 | cnt++; | |
1281 | read_unlock_bh(&idev->lock); | |
1282 | return cnt; | |
1283 | } | |
1284 | ||
1285 | int ipv6_chk_addr(struct net *net, struct in6_addr *addr, | |
1286 | struct net_device *dev, int strict) | |
1287 | { | |
1288 | struct inet6_ifaddr *ifp; | |
1289 | struct hlist_node *node; | |
1290 | unsigned int hash = ipv6_addr_hash(addr); | |
1291 | ||
1292 | rcu_read_lock_bh(); | |
1293 | hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { | |
1294 | if (!net_eq(dev_net(ifp->idev->dev), net)) | |
1295 | continue; | |
1296 | if (ipv6_addr_equal(&ifp->addr, addr) && | |
1297 | !(ifp->flags&IFA_F_TENTATIVE) && | |
1298 | (dev == NULL || ifp->idev->dev == dev || | |
1299 | !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { | |
1300 | rcu_read_unlock_bh(); | |
1301 | return 1; | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | rcu_read_unlock_bh(); | |
1306 | return 0; | |
1307 | } | |
1308 | EXPORT_SYMBOL(ipv6_chk_addr); | |
1309 | ||
1310 | static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, | |
1311 | struct net_device *dev) | |
1312 | { | |
1313 | unsigned int hash = ipv6_addr_hash(addr); | |
1314 | struct inet6_ifaddr *ifp; | |
1315 | struct hlist_node *node; | |
1316 | ||
1317 | hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { | |
1318 | if (!net_eq(dev_net(ifp->idev->dev), net)) | |
1319 | continue; | |
1320 | if (ipv6_addr_equal(&ifp->addr, addr)) { | |
1321 | if (dev == NULL || ifp->idev->dev == dev) | |
1322 | return true; | |
1323 | } | |
1324 | } | |
1325 | return false; | |
1326 | } | |
1327 | ||
1328 | int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) | |
1329 | { | |
1330 | struct inet6_dev *idev; | |
1331 | struct inet6_ifaddr *ifa; | |
1332 | int onlink; | |
1333 | ||
1334 | onlink = 0; | |
1335 | rcu_read_lock(); | |
1336 | idev = __in6_dev_get(dev); | |
1337 | if (idev) { | |
1338 | read_lock_bh(&idev->lock); | |
1339 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
1340 | onlink = ipv6_prefix_equal(addr, &ifa->addr, | |
1341 | ifa->prefix_len); | |
1342 | if (onlink) | |
1343 | break; | |
1344 | } | |
1345 | read_unlock_bh(&idev->lock); | |
1346 | } | |
1347 | rcu_read_unlock(); | |
1348 | return onlink; | |
1349 | } | |
1350 | ||
1351 | EXPORT_SYMBOL(ipv6_chk_prefix); | |
1352 | ||
1353 | struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, | |
1354 | struct net_device *dev, int strict) | |
1355 | { | |
1356 | struct inet6_ifaddr *ifp, *result = NULL; | |
1357 | unsigned int hash = ipv6_addr_hash(addr); | |
1358 | struct hlist_node *node; | |
1359 | ||
1360 | rcu_read_lock_bh(); | |
1361 | hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { | |
1362 | if (!net_eq(dev_net(ifp->idev->dev), net)) | |
1363 | continue; | |
1364 | if (ipv6_addr_equal(&ifp->addr, addr)) { | |
1365 | if (dev == NULL || ifp->idev->dev == dev || | |
1366 | !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { | |
1367 | result = ifp; | |
1368 | in6_ifa_hold(ifp); | |
1369 | break; | |
1370 | } | |
1371 | } | |
1372 | } | |
1373 | rcu_read_unlock_bh(); | |
1374 | ||
1375 | return result; | |
1376 | } | |
1377 | ||
1378 | /* Gets referenced address, destroys ifaddr */ | |
1379 | ||
1380 | static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) | |
1381 | { | |
1382 | if (ifp->flags&IFA_F_PERMANENT) { | |
1383 | spin_lock_bh(&ifp->lock); | |
1384 | addrconf_del_timer(ifp); | |
1385 | ifp->flags |= IFA_F_TENTATIVE; | |
1386 | if (dad_failed) | |
1387 | ifp->flags |= IFA_F_DADFAILED; | |
1388 | spin_unlock_bh(&ifp->lock); | |
1389 | if (dad_failed) | |
1390 | ipv6_ifa_notify(0, ifp); | |
1391 | in6_ifa_put(ifp); | |
1392 | #ifdef CONFIG_IPV6_PRIVACY | |
1393 | } else if (ifp->flags&IFA_F_TEMPORARY) { | |
1394 | struct inet6_ifaddr *ifpub; | |
1395 | spin_lock_bh(&ifp->lock); | |
1396 | ifpub = ifp->ifpub; | |
1397 | if (ifpub) { | |
1398 | in6_ifa_hold(ifpub); | |
1399 | spin_unlock_bh(&ifp->lock); | |
1400 | ipv6_create_tempaddr(ifpub, ifp); | |
1401 | in6_ifa_put(ifpub); | |
1402 | } else { | |
1403 | spin_unlock_bh(&ifp->lock); | |
1404 | } | |
1405 | ipv6_del_addr(ifp); | |
1406 | #endif | |
1407 | } else | |
1408 | ipv6_del_addr(ifp); | |
1409 | } | |
1410 | ||
1411 | static int addrconf_dad_end(struct inet6_ifaddr *ifp) | |
1412 | { | |
1413 | int err = -ENOENT; | |
1414 | ||
1415 | spin_lock(&ifp->state_lock); | |
1416 | if (ifp->state == INET6_IFADDR_STATE_DAD) { | |
1417 | ifp->state = INET6_IFADDR_STATE_POSTDAD; | |
1418 | err = 0; | |
1419 | } | |
1420 | spin_unlock(&ifp->state_lock); | |
1421 | ||
1422 | return err; | |
1423 | } | |
1424 | ||
1425 | void addrconf_dad_failure(struct inet6_ifaddr *ifp) | |
1426 | { | |
1427 | struct inet6_dev *idev = ifp->idev; | |
1428 | ||
1429 | if (addrconf_dad_end(ifp)) | |
1430 | return; | |
1431 | ||
1432 | if (net_ratelimit()) | |
1433 | printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", | |
1434 | ifp->idev->dev->name, &ifp->addr); | |
1435 | ||
1436 | if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { | |
1437 | struct in6_addr addr; | |
1438 | ||
1439 | addr.s6_addr32[0] = htonl(0xfe800000); | |
1440 | addr.s6_addr32[1] = 0; | |
1441 | ||
1442 | if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && | |
1443 | ipv6_addr_equal(&ifp->addr, &addr)) { | |
1444 | /* DAD failed for link-local based on MAC address */ | |
1445 | idev->cnf.disable_ipv6 = 1; | |
1446 | ||
1447 | printk(KERN_INFO "%s: IPv6 being disabled!\n", | |
1448 | ifp->idev->dev->name); | |
1449 | } | |
1450 | } | |
1451 | ||
1452 | addrconf_dad_stop(ifp, 1); | |
1453 | } | |
1454 | ||
1455 | /* Join to solicited addr multicast group. */ | |
1456 | ||
1457 | void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) | |
1458 | { | |
1459 | struct in6_addr maddr; | |
1460 | ||
1461 | if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) | |
1462 | return; | |
1463 | ||
1464 | addrconf_addr_solict_mult(addr, &maddr); | |
1465 | ipv6_dev_mc_inc(dev, &maddr); | |
1466 | } | |
1467 | ||
1468 | void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) | |
1469 | { | |
1470 | struct in6_addr maddr; | |
1471 | ||
1472 | if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) | |
1473 | return; | |
1474 | ||
1475 | addrconf_addr_solict_mult(addr, &maddr); | |
1476 | __ipv6_dev_mc_dec(idev, &maddr); | |
1477 | } | |
1478 | ||
1479 | static void addrconf_join_anycast(struct inet6_ifaddr *ifp) | |
1480 | { | |
1481 | struct in6_addr addr; | |
1482 | ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); | |
1483 | if (ipv6_addr_any(&addr)) | |
1484 | return; | |
1485 | ipv6_dev_ac_inc(ifp->idev->dev, &addr); | |
1486 | } | |
1487 | ||
1488 | static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) | |
1489 | { | |
1490 | struct in6_addr addr; | |
1491 | ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); | |
1492 | if (ipv6_addr_any(&addr)) | |
1493 | return; | |
1494 | __ipv6_dev_ac_dec(ifp->idev, &addr); | |
1495 | } | |
1496 | ||
1497 | static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) | |
1498 | { | |
1499 | if (dev->addr_len != ETH_ALEN) | |
1500 | return -1; | |
1501 | memcpy(eui, dev->dev_addr, 3); | |
1502 | memcpy(eui + 5, dev->dev_addr + 3, 3); | |
1503 | ||
1504 | /* | |
1505 | * The zSeries OSA network cards can be shared among various | |
1506 | * OS instances, but the OSA cards have only one MAC address. | |
1507 | * This leads to duplicate address conflicts in conjunction | |
1508 | * with IPv6 if more than one instance uses the same card. | |
1509 | * | |
1510 | * The driver for these cards can deliver a unique 16-bit | |
1511 | * identifier for each instance sharing the same card. It is | |
1512 | * placed instead of 0xFFFE in the interface identifier. The | |
1513 | * "u" bit of the interface identifier is not inverted in this | |
1514 | * case. Hence the resulting interface identifier has local | |
1515 | * scope according to RFC2373. | |
1516 | */ | |
1517 | if (dev->dev_id) { | |
1518 | eui[3] = (dev->dev_id >> 8) & 0xFF; | |
1519 | eui[4] = dev->dev_id & 0xFF; | |
1520 | } else { | |
1521 | eui[3] = 0xFF; | |
1522 | eui[4] = 0xFE; | |
1523 | eui[0] ^= 2; | |
1524 | } | |
1525 | return 0; | |
1526 | } | |
1527 | ||
1528 | static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) | |
1529 | { | |
1530 | /* XXX: inherit EUI-64 from other interface -- yoshfuji */ | |
1531 | if (dev->addr_len != ARCNET_ALEN) | |
1532 | return -1; | |
1533 | memset(eui, 0, 7); | |
1534 | eui[7] = *(u8*)dev->dev_addr; | |
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) | |
1539 | { | |
1540 | if (dev->addr_len != INFINIBAND_ALEN) | |
1541 | return -1; | |
1542 | memcpy(eui, dev->dev_addr + 12, 8); | |
1543 | eui[0] |= 2; | |
1544 | return 0; | |
1545 | } | |
1546 | ||
1547 | int __ipv6_isatap_ifid(u8 *eui, __be32 addr) | |
1548 | { | |
1549 | if (addr == 0) | |
1550 | return -1; | |
1551 | eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || | |
1552 | ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || | |
1553 | ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || | |
1554 | ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || | |
1555 | ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || | |
1556 | ipv4_is_lbcast(addr)) ? 0x00 : 0x02; | |
1557 | eui[1] = 0; | |
1558 | eui[2] = 0x5E; | |
1559 | eui[3] = 0xFE; | |
1560 | memcpy(eui + 4, &addr, 4); | |
1561 | return 0; | |
1562 | } | |
1563 | EXPORT_SYMBOL(__ipv6_isatap_ifid); | |
1564 | ||
1565 | static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) | |
1566 | { | |
1567 | if (dev->priv_flags & IFF_ISATAP) | |
1568 | return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); | |
1569 | return -1; | |
1570 | } | |
1571 | ||
1572 | static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) | |
1573 | { | |
1574 | switch (dev->type) { | |
1575 | case ARPHRD_ETHER: | |
1576 | case ARPHRD_FDDI: | |
1577 | case ARPHRD_IEEE802_TR: | |
1578 | return addrconf_ifid_eui48(eui, dev); | |
1579 | case ARPHRD_ARCNET: | |
1580 | return addrconf_ifid_arcnet(eui, dev); | |
1581 | case ARPHRD_INFINIBAND: | |
1582 | return addrconf_ifid_infiniband(eui, dev); | |
1583 | case ARPHRD_SIT: | |
1584 | return addrconf_ifid_sit(eui, dev); | |
1585 | } | |
1586 | return -1; | |
1587 | } | |
1588 | ||
1589 | static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) | |
1590 | { | |
1591 | int err = -1; | |
1592 | struct inet6_ifaddr *ifp; | |
1593 | ||
1594 | read_lock_bh(&idev->lock); | |
1595 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
1596 | if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { | |
1597 | memcpy(eui, ifp->addr.s6_addr+8, 8); | |
1598 | err = 0; | |
1599 | break; | |
1600 | } | |
1601 | } | |
1602 | read_unlock_bh(&idev->lock); | |
1603 | return err; | |
1604 | } | |
1605 | ||
1606 | #ifdef CONFIG_IPV6_PRIVACY | |
1607 | /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ | |
1608 | static int __ipv6_regen_rndid(struct inet6_dev *idev) | |
1609 | { | |
1610 | regen: | |
1611 | get_random_bytes(idev->rndid, sizeof(idev->rndid)); | |
1612 | idev->rndid[0] &= ~0x02; | |
1613 | ||
1614 | /* | |
1615 | * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: | |
1616 | * check if generated address is not inappropriate | |
1617 | * | |
1618 | * - Reserved subnet anycast (RFC 2526) | |
1619 | * 11111101 11....11 1xxxxxxx | |
1620 | * - ISATAP (RFC4214) 6.1 | |
1621 | * 00-00-5E-FE-xx-xx-xx-xx | |
1622 | * - value 0 | |
1623 | * - XXX: already assigned to an address on the device | |
1624 | */ | |
1625 | if (idev->rndid[0] == 0xfd && | |
1626 | (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && | |
1627 | (idev->rndid[7]&0x80)) | |
1628 | goto regen; | |
1629 | if ((idev->rndid[0]|idev->rndid[1]) == 0) { | |
1630 | if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) | |
1631 | goto regen; | |
1632 | if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) | |
1633 | goto regen; | |
1634 | } | |
1635 | ||
1636 | return 0; | |
1637 | } | |
1638 | ||
1639 | static void ipv6_regen_rndid(unsigned long data) | |
1640 | { | |
1641 | struct inet6_dev *idev = (struct inet6_dev *) data; | |
1642 | unsigned long expires; | |
1643 | ||
1644 | rcu_read_lock_bh(); | |
1645 | write_lock_bh(&idev->lock); | |
1646 | ||
1647 | if (idev->dead) | |
1648 | goto out; | |
1649 | ||
1650 | if (__ipv6_regen_rndid(idev) < 0) | |
1651 | goto out; | |
1652 | ||
1653 | expires = jiffies + | |
1654 | idev->cnf.temp_prefered_lft * HZ - | |
1655 | idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - | |
1656 | idev->cnf.max_desync_factor * HZ; | |
1657 | if (time_before(expires, jiffies)) { | |
1658 | printk(KERN_WARNING | |
1659 | "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", | |
1660 | idev->dev->name); | |
1661 | goto out; | |
1662 | } | |
1663 | ||
1664 | if (!mod_timer(&idev->regen_timer, expires)) | |
1665 | in6_dev_hold(idev); | |
1666 | ||
1667 | out: | |
1668 | write_unlock_bh(&idev->lock); | |
1669 | rcu_read_unlock_bh(); | |
1670 | in6_dev_put(idev); | |
1671 | } | |
1672 | ||
1673 | static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { | |
1674 | int ret = 0; | |
1675 | ||
1676 | if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) | |
1677 | ret = __ipv6_regen_rndid(idev); | |
1678 | return ret; | |
1679 | } | |
1680 | #endif | |
1681 | ||
1682 | /* | |
1683 | * Add prefix route. | |
1684 | */ | |
1685 | ||
1686 | static void | |
1687 | addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, | |
1688 | unsigned long expires, u32 flags) | |
1689 | { | |
1690 | struct fib6_config cfg = { | |
1691 | .fc_table = RT6_TABLE_PREFIX, | |
1692 | .fc_metric = IP6_RT_PRIO_ADDRCONF, | |
1693 | .fc_ifindex = dev->ifindex, | |
1694 | .fc_expires = expires, | |
1695 | .fc_dst_len = plen, | |
1696 | .fc_flags = RTF_UP | flags, | |
1697 | .fc_nlinfo.nl_net = dev_net(dev), | |
1698 | .fc_protocol = RTPROT_KERNEL, | |
1699 | }; | |
1700 | ||
1701 | ipv6_addr_copy(&cfg.fc_dst, pfx); | |
1702 | ||
1703 | /* Prevent useless cloning on PtP SIT. | |
1704 | This thing is done here expecting that the whole | |
1705 | class of non-broadcast devices need not cloning. | |
1706 | */ | |
1707 | #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) | |
1708 | if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) | |
1709 | cfg.fc_flags |= RTF_NONEXTHOP; | |
1710 | #endif | |
1711 | ||
1712 | ip6_route_add(&cfg); | |
1713 | } | |
1714 | ||
1715 | /* Create "default" multicast route to the interface */ | |
1716 | ||
1717 | static void addrconf_add_mroute(struct net_device *dev) | |
1718 | { | |
1719 | struct fib6_config cfg = { | |
1720 | .fc_table = RT6_TABLE_LOCAL, | |
1721 | .fc_metric = IP6_RT_PRIO_ADDRCONF, | |
1722 | .fc_ifindex = dev->ifindex, | |
1723 | .fc_dst_len = 8, | |
1724 | .fc_flags = RTF_UP, | |
1725 | .fc_nlinfo.nl_net = dev_net(dev), | |
1726 | }; | |
1727 | ||
1728 | ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); | |
1729 | ||
1730 | ip6_route_add(&cfg); | |
1731 | } | |
1732 | ||
1733 | #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) | |
1734 | static void sit_route_add(struct net_device *dev) | |
1735 | { | |
1736 | struct fib6_config cfg = { | |
1737 | .fc_table = RT6_TABLE_MAIN, | |
1738 | .fc_metric = IP6_RT_PRIO_ADDRCONF, | |
1739 | .fc_ifindex = dev->ifindex, | |
1740 | .fc_dst_len = 96, | |
1741 | .fc_flags = RTF_UP | RTF_NONEXTHOP, | |
1742 | .fc_nlinfo.nl_net = dev_net(dev), | |
1743 | }; | |
1744 | ||
1745 | /* prefix length - 96 bits "::d.d.d.d" */ | |
1746 | ip6_route_add(&cfg); | |
1747 | } | |
1748 | #endif | |
1749 | ||
1750 | static void addrconf_add_lroute(struct net_device *dev) | |
1751 | { | |
1752 | struct in6_addr addr; | |
1753 | ||
1754 | ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); | |
1755 | addrconf_prefix_route(&addr, 64, dev, 0, 0); | |
1756 | } | |
1757 | ||
1758 | static struct inet6_dev *addrconf_add_dev(struct net_device *dev) | |
1759 | { | |
1760 | struct inet6_dev *idev; | |
1761 | ||
1762 | ASSERT_RTNL(); | |
1763 | ||
1764 | idev = ipv6_find_idev(dev); | |
1765 | if (!idev) | |
1766 | return ERR_PTR(-ENOBUFS); | |
1767 | ||
1768 | if (idev->cnf.disable_ipv6) | |
1769 | return ERR_PTR(-EACCES); | |
1770 | ||
1771 | /* Add default multicast route */ | |
1772 | addrconf_add_mroute(dev); | |
1773 | ||
1774 | /* Add link local route */ | |
1775 | addrconf_add_lroute(dev); | |
1776 | return idev; | |
1777 | } | |
1778 | ||
1779 | void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) | |
1780 | { | |
1781 | struct prefix_info *pinfo; | |
1782 | __u32 valid_lft; | |
1783 | __u32 prefered_lft; | |
1784 | int addr_type; | |
1785 | struct inet6_dev *in6_dev; | |
1786 | struct net *net = dev_net(dev); | |
1787 | ||
1788 | pinfo = (struct prefix_info *) opt; | |
1789 | ||
1790 | if (len < sizeof(struct prefix_info)) { | |
1791 | ADBG(("addrconf: prefix option too short\n")); | |
1792 | return; | |
1793 | } | |
1794 | ||
1795 | /* | |
1796 | * Validation checks ([ADDRCONF], page 19) | |
1797 | */ | |
1798 | ||
1799 | addr_type = ipv6_addr_type(&pinfo->prefix); | |
1800 | ||
1801 | if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) | |
1802 | return; | |
1803 | ||
1804 | valid_lft = ntohl(pinfo->valid); | |
1805 | prefered_lft = ntohl(pinfo->prefered); | |
1806 | ||
1807 | if (prefered_lft > valid_lft) { | |
1808 | if (net_ratelimit()) | |
1809 | printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); | |
1810 | return; | |
1811 | } | |
1812 | ||
1813 | in6_dev = in6_dev_get(dev); | |
1814 | ||
1815 | if (in6_dev == NULL) { | |
1816 | if (net_ratelimit()) | |
1817 | printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); | |
1818 | return; | |
1819 | } | |
1820 | ||
1821 | /* | |
1822 | * Two things going on here: | |
1823 | * 1) Add routes for on-link prefixes | |
1824 | * 2) Configure prefixes with the auto flag set | |
1825 | */ | |
1826 | ||
1827 | if (pinfo->onlink) { | |
1828 | struct rt6_info *rt; | |
1829 | unsigned long rt_expires; | |
1830 | ||
1831 | /* Avoid arithmetic overflow. Really, we could | |
1832 | * save rt_expires in seconds, likely valid_lft, | |
1833 | * but it would require division in fib gc, that it | |
1834 | * not good. | |
1835 | */ | |
1836 | if (HZ > USER_HZ) | |
1837 | rt_expires = addrconf_timeout_fixup(valid_lft, HZ); | |
1838 | else | |
1839 | rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); | |
1840 | ||
1841 | if (addrconf_finite_timeout(rt_expires)) | |
1842 | rt_expires *= HZ; | |
1843 | ||
1844 | rt = rt6_lookup(net, &pinfo->prefix, NULL, | |
1845 | dev->ifindex, 1); | |
1846 | ||
1847 | if (rt && addrconf_is_prefix_route(rt)) { | |
1848 | /* Autoconf prefix route */ | |
1849 | if (valid_lft == 0) { | |
1850 | ip6_del_rt(rt); | |
1851 | rt = NULL; | |
1852 | } else if (addrconf_finite_timeout(rt_expires)) { | |
1853 | /* not infinity */ | |
1854 | rt->rt6i_expires = jiffies + rt_expires; | |
1855 | rt->rt6i_flags |= RTF_EXPIRES; | |
1856 | } else { | |
1857 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
1858 | rt->rt6i_expires = 0; | |
1859 | } | |
1860 | } else if (valid_lft) { | |
1861 | clock_t expires = 0; | |
1862 | int flags = RTF_ADDRCONF | RTF_PREFIX_RT; | |
1863 | if (addrconf_finite_timeout(rt_expires)) { | |
1864 | /* not infinity */ | |
1865 | flags |= RTF_EXPIRES; | |
1866 | expires = jiffies_to_clock_t(rt_expires); | |
1867 | } | |
1868 | addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, | |
1869 | dev, expires, flags); | |
1870 | } | |
1871 | if (rt) | |
1872 | dst_release(&rt->dst); | |
1873 | } | |
1874 | ||
1875 | /* Try to figure out our local address for this prefix */ | |
1876 | ||
1877 | if (pinfo->autoconf && in6_dev->cnf.autoconf) { | |
1878 | struct inet6_ifaddr * ifp; | |
1879 | struct in6_addr addr; | |
1880 | int create = 0, update_lft = 0; | |
1881 | ||
1882 | if (pinfo->prefix_len == 64) { | |
1883 | memcpy(&addr, &pinfo->prefix, 8); | |
1884 | if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && | |
1885 | ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { | |
1886 | in6_dev_put(in6_dev); | |
1887 | return; | |
1888 | } | |
1889 | goto ok; | |
1890 | } | |
1891 | if (net_ratelimit()) | |
1892 | printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", | |
1893 | pinfo->prefix_len); | |
1894 | in6_dev_put(in6_dev); | |
1895 | return; | |
1896 | ||
1897 | ok: | |
1898 | ||
1899 | ifp = ipv6_get_ifaddr(net, &addr, dev, 1); | |
1900 | ||
1901 | if (ifp == NULL && valid_lft) { | |
1902 | int max_addresses = in6_dev->cnf.max_addresses; | |
1903 | u32 addr_flags = 0; | |
1904 | ||
1905 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
1906 | if (in6_dev->cnf.optimistic_dad && | |
1907 | !net->ipv6.devconf_all->forwarding) | |
1908 | addr_flags = IFA_F_OPTIMISTIC; | |
1909 | #endif | |
1910 | ||
1911 | /* Do not allow to create too much of autoconfigured | |
1912 | * addresses; this would be too easy way to crash kernel. | |
1913 | */ | |
1914 | if (!max_addresses || | |
1915 | ipv6_count_addresses(in6_dev) < max_addresses) | |
1916 | ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, | |
1917 | addr_type&IPV6_ADDR_SCOPE_MASK, | |
1918 | addr_flags); | |
1919 | ||
1920 | if (!ifp || IS_ERR(ifp)) { | |
1921 | in6_dev_put(in6_dev); | |
1922 | return; | |
1923 | } | |
1924 | ||
1925 | update_lft = create = 1; | |
1926 | ifp->cstamp = jiffies; | |
1927 | addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); | |
1928 | } | |
1929 | ||
1930 | if (ifp) { | |
1931 | int flags; | |
1932 | unsigned long now; | |
1933 | #ifdef CONFIG_IPV6_PRIVACY | |
1934 | struct inet6_ifaddr *ift; | |
1935 | #endif | |
1936 | u32 stored_lft; | |
1937 | ||
1938 | /* update lifetime (RFC2462 5.5.3 e) */ | |
1939 | spin_lock(&ifp->lock); | |
1940 | now = jiffies; | |
1941 | if (ifp->valid_lft > (now - ifp->tstamp) / HZ) | |
1942 | stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; | |
1943 | else | |
1944 | stored_lft = 0; | |
1945 | if (!update_lft && stored_lft) { | |
1946 | if (valid_lft > MIN_VALID_LIFETIME || | |
1947 | valid_lft > stored_lft) | |
1948 | update_lft = 1; | |
1949 | else if (stored_lft <= MIN_VALID_LIFETIME) { | |
1950 | /* valid_lft <= stored_lft is always true */ | |
1951 | /* | |
1952 | * RFC 4862 Section 5.5.3e: | |
1953 | * "Note that the preferred lifetime of | |
1954 | * the corresponding address is always | |
1955 | * reset to the Preferred Lifetime in | |
1956 | * the received Prefix Information | |
1957 | * option, regardless of whether the | |
1958 | * valid lifetime is also reset or | |
1959 | * ignored." | |
1960 | * | |
1961 | * So if the preferred lifetime in | |
1962 | * this advertisement is different | |
1963 | * than what we have stored, but the | |
1964 | * valid lifetime is invalid, just | |
1965 | * reset prefered_lft. | |
1966 | * | |
1967 | * We must set the valid lifetime | |
1968 | * to the stored lifetime since we'll | |
1969 | * be updating the timestamp below, | |
1970 | * else we'll set it back to the | |
1971 | * minumum. | |
1972 | */ | |
1973 | if (prefered_lft != ifp->prefered_lft) { | |
1974 | valid_lft = stored_lft; | |
1975 | update_lft = 1; | |
1976 | } | |
1977 | } else { | |
1978 | valid_lft = MIN_VALID_LIFETIME; | |
1979 | if (valid_lft < prefered_lft) | |
1980 | prefered_lft = valid_lft; | |
1981 | update_lft = 1; | |
1982 | } | |
1983 | } | |
1984 | ||
1985 | if (update_lft) { | |
1986 | ifp->valid_lft = valid_lft; | |
1987 | ifp->prefered_lft = prefered_lft; | |
1988 | ifp->tstamp = now; | |
1989 | flags = ifp->flags; | |
1990 | ifp->flags &= ~IFA_F_DEPRECATED; | |
1991 | spin_unlock(&ifp->lock); | |
1992 | ||
1993 | if (!(flags&IFA_F_TENTATIVE)) | |
1994 | ipv6_ifa_notify(0, ifp); | |
1995 | } else | |
1996 | spin_unlock(&ifp->lock); | |
1997 | ||
1998 | #ifdef CONFIG_IPV6_PRIVACY | |
1999 | read_lock_bh(&in6_dev->lock); | |
2000 | /* update all temporary addresses in the list */ | |
2001 | list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) { | |
2002 | /* | |
2003 | * When adjusting the lifetimes of an existing | |
2004 | * temporary address, only lower the lifetimes. | |
2005 | * Implementations must not increase the | |
2006 | * lifetimes of an existing temporary address | |
2007 | * when processing a Prefix Information Option. | |
2008 | */ | |
2009 | if (ifp != ift->ifpub) | |
2010 | continue; | |
2011 | ||
2012 | spin_lock(&ift->lock); | |
2013 | flags = ift->flags; | |
2014 | if (ift->valid_lft > valid_lft && | |
2015 | ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) | |
2016 | ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; | |
2017 | if (ift->prefered_lft > prefered_lft && | |
2018 | ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) | |
2019 | ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; | |
2020 | spin_unlock(&ift->lock); | |
2021 | if (!(flags&IFA_F_TENTATIVE)) | |
2022 | ipv6_ifa_notify(0, ift); | |
2023 | } | |
2024 | ||
2025 | if (create && in6_dev->cnf.use_tempaddr > 0) { | |
2026 | /* | |
2027 | * When a new public address is created as described in [ADDRCONF], | |
2028 | * also create a new temporary address. | |
2029 | */ | |
2030 | read_unlock_bh(&in6_dev->lock); | |
2031 | ipv6_create_tempaddr(ifp, NULL); | |
2032 | } else { | |
2033 | read_unlock_bh(&in6_dev->lock); | |
2034 | } | |
2035 | #endif | |
2036 | in6_ifa_put(ifp); | |
2037 | addrconf_verify(0); | |
2038 | } | |
2039 | } | |
2040 | inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); | |
2041 | in6_dev_put(in6_dev); | |
2042 | } | |
2043 | ||
2044 | /* | |
2045 | * Set destination address. | |
2046 | * Special case for SIT interfaces where we create a new "virtual" | |
2047 | * device. | |
2048 | */ | |
2049 | int addrconf_set_dstaddr(struct net *net, void __user *arg) | |
2050 | { | |
2051 | struct in6_ifreq ireq; | |
2052 | struct net_device *dev; | |
2053 | int err = -EINVAL; | |
2054 | ||
2055 | rtnl_lock(); | |
2056 | ||
2057 | err = -EFAULT; | |
2058 | if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) | |
2059 | goto err_exit; | |
2060 | ||
2061 | dev = __dev_get_by_index(net, ireq.ifr6_ifindex); | |
2062 | ||
2063 | err = -ENODEV; | |
2064 | if (dev == NULL) | |
2065 | goto err_exit; | |
2066 | ||
2067 | #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) | |
2068 | if (dev->type == ARPHRD_SIT) { | |
2069 | const struct net_device_ops *ops = dev->netdev_ops; | |
2070 | struct ifreq ifr; | |
2071 | struct ip_tunnel_parm p; | |
2072 | ||
2073 | err = -EADDRNOTAVAIL; | |
2074 | if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) | |
2075 | goto err_exit; | |
2076 | ||
2077 | memset(&p, 0, sizeof(p)); | |
2078 | p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; | |
2079 | p.iph.saddr = 0; | |
2080 | p.iph.version = 4; | |
2081 | p.iph.ihl = 5; | |
2082 | p.iph.protocol = IPPROTO_IPV6; | |
2083 | p.iph.ttl = 64; | |
2084 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
2085 | ||
2086 | if (ops->ndo_do_ioctl) { | |
2087 | mm_segment_t oldfs = get_fs(); | |
2088 | ||
2089 | set_fs(KERNEL_DS); | |
2090 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
2091 | set_fs(oldfs); | |
2092 | } else | |
2093 | err = -EOPNOTSUPP; | |
2094 | ||
2095 | if (err == 0) { | |
2096 | err = -ENOBUFS; | |
2097 | dev = __dev_get_by_name(net, p.name); | |
2098 | if (!dev) | |
2099 | goto err_exit; | |
2100 | err = dev_open(dev); | |
2101 | } | |
2102 | } | |
2103 | #endif | |
2104 | ||
2105 | err_exit: | |
2106 | rtnl_unlock(); | |
2107 | return err; | |
2108 | } | |
2109 | ||
2110 | /* | |
2111 | * Manual configuration of address on an interface | |
2112 | */ | |
2113 | static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, | |
2114 | unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, | |
2115 | __u32 valid_lft) | |
2116 | { | |
2117 | struct inet6_ifaddr *ifp; | |
2118 | struct inet6_dev *idev; | |
2119 | struct net_device *dev; | |
2120 | int scope; | |
2121 | u32 flags; | |
2122 | clock_t expires; | |
2123 | unsigned long timeout; | |
2124 | ||
2125 | ASSERT_RTNL(); | |
2126 | ||
2127 | if (plen > 128) | |
2128 | return -EINVAL; | |
2129 | ||
2130 | /* check the lifetime */ | |
2131 | if (!valid_lft || prefered_lft > valid_lft) | |
2132 | return -EINVAL; | |
2133 | ||
2134 | dev = __dev_get_by_index(net, ifindex); | |
2135 | if (!dev) | |
2136 | return -ENODEV; | |
2137 | ||
2138 | idev = addrconf_add_dev(dev); | |
2139 | if (IS_ERR(idev)) | |
2140 | return PTR_ERR(idev); | |
2141 | ||
2142 | scope = ipv6_addr_scope(pfx); | |
2143 | ||
2144 | timeout = addrconf_timeout_fixup(valid_lft, HZ); | |
2145 | if (addrconf_finite_timeout(timeout)) { | |
2146 | expires = jiffies_to_clock_t(timeout * HZ); | |
2147 | valid_lft = timeout; | |
2148 | flags = RTF_EXPIRES; | |
2149 | } else { | |
2150 | expires = 0; | |
2151 | flags = 0; | |
2152 | ifa_flags |= IFA_F_PERMANENT; | |
2153 | } | |
2154 | ||
2155 | timeout = addrconf_timeout_fixup(prefered_lft, HZ); | |
2156 | if (addrconf_finite_timeout(timeout)) { | |
2157 | if (timeout == 0) | |
2158 | ifa_flags |= IFA_F_DEPRECATED; | |
2159 | prefered_lft = timeout; | |
2160 | } | |
2161 | ||
2162 | ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); | |
2163 | ||
2164 | if (!IS_ERR(ifp)) { | |
2165 | spin_lock_bh(&ifp->lock); | |
2166 | ifp->valid_lft = valid_lft; | |
2167 | ifp->prefered_lft = prefered_lft; | |
2168 | ifp->tstamp = jiffies; | |
2169 | spin_unlock_bh(&ifp->lock); | |
2170 | ||
2171 | addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, | |
2172 | expires, flags); | |
2173 | /* | |
2174 | * Note that section 3.1 of RFC 4429 indicates | |
2175 | * that the Optimistic flag should not be set for | |
2176 | * manually configured addresses | |
2177 | */ | |
2178 | addrconf_dad_start(ifp, 0); | |
2179 | in6_ifa_put(ifp); | |
2180 | addrconf_verify(0); | |
2181 | return 0; | |
2182 | } | |
2183 | ||
2184 | return PTR_ERR(ifp); | |
2185 | } | |
2186 | ||
2187 | static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, | |
2188 | unsigned int plen) | |
2189 | { | |
2190 | struct inet6_ifaddr *ifp; | |
2191 | struct inet6_dev *idev; | |
2192 | struct net_device *dev; | |
2193 | ||
2194 | if (plen > 128) | |
2195 | return -EINVAL; | |
2196 | ||
2197 | dev = __dev_get_by_index(net, ifindex); | |
2198 | if (!dev) | |
2199 | return -ENODEV; | |
2200 | ||
2201 | if ((idev = __in6_dev_get(dev)) == NULL) | |
2202 | return -ENXIO; | |
2203 | ||
2204 | read_lock_bh(&idev->lock); | |
2205 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
2206 | if (ifp->prefix_len == plen && | |
2207 | ipv6_addr_equal(pfx, &ifp->addr)) { | |
2208 | in6_ifa_hold(ifp); | |
2209 | read_unlock_bh(&idev->lock); | |
2210 | ||
2211 | ipv6_del_addr(ifp); | |
2212 | ||
2213 | /* If the last address is deleted administratively, | |
2214 | disable IPv6 on this interface. | |
2215 | */ | |
2216 | if (list_empty(&idev->addr_list)) | |
2217 | addrconf_ifdown(idev->dev, 1); | |
2218 | return 0; | |
2219 | } | |
2220 | } | |
2221 | read_unlock_bh(&idev->lock); | |
2222 | return -EADDRNOTAVAIL; | |
2223 | } | |
2224 | ||
2225 | ||
2226 | int addrconf_add_ifaddr(struct net *net, void __user *arg) | |
2227 | { | |
2228 | struct in6_ifreq ireq; | |
2229 | int err; | |
2230 | ||
2231 | if (!capable(CAP_NET_ADMIN)) | |
2232 | return -EPERM; | |
2233 | ||
2234 | if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) | |
2235 | return -EFAULT; | |
2236 | ||
2237 | rtnl_lock(); | |
2238 | err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, | |
2239 | ireq.ifr6_prefixlen, IFA_F_PERMANENT, | |
2240 | INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); | |
2241 | rtnl_unlock(); | |
2242 | return err; | |
2243 | } | |
2244 | ||
2245 | int addrconf_del_ifaddr(struct net *net, void __user *arg) | |
2246 | { | |
2247 | struct in6_ifreq ireq; | |
2248 | int err; | |
2249 | ||
2250 | if (!capable(CAP_NET_ADMIN)) | |
2251 | return -EPERM; | |
2252 | ||
2253 | if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) | |
2254 | return -EFAULT; | |
2255 | ||
2256 | rtnl_lock(); | |
2257 | err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, | |
2258 | ireq.ifr6_prefixlen); | |
2259 | rtnl_unlock(); | |
2260 | return err; | |
2261 | } | |
2262 | ||
2263 | static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, | |
2264 | int plen, int scope) | |
2265 | { | |
2266 | struct inet6_ifaddr *ifp; | |
2267 | ||
2268 | ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); | |
2269 | if (!IS_ERR(ifp)) { | |
2270 | spin_lock_bh(&ifp->lock); | |
2271 | ifp->flags &= ~IFA_F_TENTATIVE; | |
2272 | spin_unlock_bh(&ifp->lock); | |
2273 | ipv6_ifa_notify(RTM_NEWADDR, ifp); | |
2274 | in6_ifa_put(ifp); | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) | |
2279 | static void sit_add_v4_addrs(struct inet6_dev *idev) | |
2280 | { | |
2281 | struct in6_addr addr; | |
2282 | struct net_device *dev; | |
2283 | struct net *net = dev_net(idev->dev); | |
2284 | int scope; | |
2285 | ||
2286 | ASSERT_RTNL(); | |
2287 | ||
2288 | memset(&addr, 0, sizeof(struct in6_addr)); | |
2289 | memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); | |
2290 | ||
2291 | if (idev->dev->flags&IFF_POINTOPOINT) { | |
2292 | addr.s6_addr32[0] = htonl(0xfe800000); | |
2293 | scope = IFA_LINK; | |
2294 | } else { | |
2295 | scope = IPV6_ADDR_COMPATv4; | |
2296 | } | |
2297 | ||
2298 | if (addr.s6_addr32[3]) { | |
2299 | add_addr(idev, &addr, 128, scope); | |
2300 | return; | |
2301 | } | |
2302 | ||
2303 | for_each_netdev(net, dev) { | |
2304 | struct in_device * in_dev = __in_dev_get_rtnl(dev); | |
2305 | if (in_dev && (dev->flags & IFF_UP)) { | |
2306 | struct in_ifaddr * ifa; | |
2307 | ||
2308 | int flag = scope; | |
2309 | ||
2310 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
2311 | int plen; | |
2312 | ||
2313 | addr.s6_addr32[3] = ifa->ifa_local; | |
2314 | ||
2315 | if (ifa->ifa_scope == RT_SCOPE_LINK) | |
2316 | continue; | |
2317 | if (ifa->ifa_scope >= RT_SCOPE_HOST) { | |
2318 | if (idev->dev->flags&IFF_POINTOPOINT) | |
2319 | continue; | |
2320 | flag |= IFA_HOST; | |
2321 | } | |
2322 | if (idev->dev->flags&IFF_POINTOPOINT) | |
2323 | plen = 64; | |
2324 | else | |
2325 | plen = 96; | |
2326 | ||
2327 | add_addr(idev, &addr, plen, flag); | |
2328 | } | |
2329 | } | |
2330 | } | |
2331 | } | |
2332 | #endif | |
2333 | ||
2334 | static void init_loopback(struct net_device *dev) | |
2335 | { | |
2336 | struct inet6_dev *idev; | |
2337 | ||
2338 | /* ::1 */ | |
2339 | ||
2340 | ASSERT_RTNL(); | |
2341 | ||
2342 | if ((idev = ipv6_find_idev(dev)) == NULL) { | |
2343 | printk(KERN_DEBUG "init loopback: add_dev failed\n"); | |
2344 | return; | |
2345 | } | |
2346 | ||
2347 | add_addr(idev, &in6addr_loopback, 128, IFA_HOST); | |
2348 | } | |
2349 | ||
2350 | static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) | |
2351 | { | |
2352 | struct inet6_ifaddr * ifp; | |
2353 | u32 addr_flags = IFA_F_PERMANENT; | |
2354 | ||
2355 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
2356 | if (idev->cnf.optimistic_dad && | |
2357 | !dev_net(idev->dev)->ipv6.devconf_all->forwarding) | |
2358 | addr_flags |= IFA_F_OPTIMISTIC; | |
2359 | #endif | |
2360 | ||
2361 | ||
2362 | ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); | |
2363 | if (!IS_ERR(ifp)) { | |
2364 | addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); | |
2365 | addrconf_dad_start(ifp, 0); | |
2366 | in6_ifa_put(ifp); | |
2367 | } | |
2368 | } | |
2369 | ||
2370 | static void addrconf_dev_config(struct net_device *dev) | |
2371 | { | |
2372 | struct in6_addr addr; | |
2373 | struct inet6_dev * idev; | |
2374 | ||
2375 | ASSERT_RTNL(); | |
2376 | ||
2377 | if ((dev->type != ARPHRD_ETHER) && | |
2378 | (dev->type != ARPHRD_FDDI) && | |
2379 | (dev->type != ARPHRD_IEEE802_TR) && | |
2380 | (dev->type != ARPHRD_ARCNET) && | |
2381 | (dev->type != ARPHRD_INFINIBAND)) { | |
2382 | /* Alas, we support only Ethernet autoconfiguration. */ | |
2383 | return; | |
2384 | } | |
2385 | ||
2386 | idev = addrconf_add_dev(dev); | |
2387 | if (IS_ERR(idev)) | |
2388 | return; | |
2389 | ||
2390 | memset(&addr, 0, sizeof(struct in6_addr)); | |
2391 | addr.s6_addr32[0] = htonl(0xFE800000); | |
2392 | ||
2393 | if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) | |
2394 | addrconf_add_linklocal(idev, &addr); | |
2395 | } | |
2396 | ||
2397 | #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) | |
2398 | static void addrconf_sit_config(struct net_device *dev) | |
2399 | { | |
2400 | struct inet6_dev *idev; | |
2401 | ||
2402 | ASSERT_RTNL(); | |
2403 | ||
2404 | /* | |
2405 | * Configure the tunnel with one of our IPv4 | |
2406 | * addresses... we should configure all of | |
2407 | * our v4 addrs in the tunnel | |
2408 | */ | |
2409 | ||
2410 | if ((idev = ipv6_find_idev(dev)) == NULL) { | |
2411 | printk(KERN_DEBUG "init sit: add_dev failed\n"); | |
2412 | return; | |
2413 | } | |
2414 | ||
2415 | if (dev->priv_flags & IFF_ISATAP) { | |
2416 | struct in6_addr addr; | |
2417 | ||
2418 | ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); | |
2419 | addrconf_prefix_route(&addr, 64, dev, 0, 0); | |
2420 | if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) | |
2421 | addrconf_add_linklocal(idev, &addr); | |
2422 | return; | |
2423 | } | |
2424 | ||
2425 | sit_add_v4_addrs(idev); | |
2426 | ||
2427 | if (dev->flags&IFF_POINTOPOINT) { | |
2428 | addrconf_add_mroute(dev); | |
2429 | addrconf_add_lroute(dev); | |
2430 | } else | |
2431 | sit_route_add(dev); | |
2432 | } | |
2433 | #endif | |
2434 | ||
2435 | static inline int | |
2436 | ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) | |
2437 | { | |
2438 | struct in6_addr lladdr; | |
2439 | ||
2440 | if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { | |
2441 | addrconf_add_linklocal(idev, &lladdr); | |
2442 | return 0; | |
2443 | } | |
2444 | return -1; | |
2445 | } | |
2446 | ||
2447 | static void ip6_tnl_add_linklocal(struct inet6_dev *idev) | |
2448 | { | |
2449 | struct net_device *link_dev; | |
2450 | struct net *net = dev_net(idev->dev); | |
2451 | ||
2452 | /* first try to inherit the link-local address from the link device */ | |
2453 | if (idev->dev->iflink && | |
2454 | (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { | |
2455 | if (!ipv6_inherit_linklocal(idev, link_dev)) | |
2456 | return; | |
2457 | } | |
2458 | /* then try to inherit it from any device */ | |
2459 | for_each_netdev(net, link_dev) { | |
2460 | if (!ipv6_inherit_linklocal(idev, link_dev)) | |
2461 | return; | |
2462 | } | |
2463 | printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); | |
2464 | } | |
2465 | ||
2466 | /* | |
2467 | * Autoconfigure tunnel with a link-local address so routing protocols, | |
2468 | * DHCPv6, MLD etc. can be run over the virtual link | |
2469 | */ | |
2470 | ||
2471 | static void addrconf_ip6_tnl_config(struct net_device *dev) | |
2472 | { | |
2473 | struct inet6_dev *idev; | |
2474 | ||
2475 | ASSERT_RTNL(); | |
2476 | ||
2477 | idev = addrconf_add_dev(dev); | |
2478 | if (IS_ERR(idev)) { | |
2479 | printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); | |
2480 | return; | |
2481 | } | |
2482 | ip6_tnl_add_linklocal(idev); | |
2483 | } | |
2484 | ||
2485 | static int addrconf_notify(struct notifier_block *this, unsigned long event, | |
2486 | void * data) | |
2487 | { | |
2488 | struct net_device *dev = (struct net_device *) data; | |
2489 | struct inet6_dev *idev = __in6_dev_get(dev); | |
2490 | int run_pending = 0; | |
2491 | int err; | |
2492 | ||
2493 | switch (event) { | |
2494 | case NETDEV_REGISTER: | |
2495 | if (!idev && dev->mtu >= IPV6_MIN_MTU) { | |
2496 | idev = ipv6_add_dev(dev); | |
2497 | if (!idev) | |
2498 | return notifier_from_errno(-ENOMEM); | |
2499 | } | |
2500 | break; | |
2501 | ||
2502 | case NETDEV_UP: | |
2503 | case NETDEV_CHANGE: | |
2504 | if (dev->flags & IFF_SLAVE) | |
2505 | break; | |
2506 | ||
2507 | if (event == NETDEV_UP) { | |
2508 | if (!addrconf_qdisc_ok(dev)) { | |
2509 | /* device is not ready yet. */ | |
2510 | printk(KERN_INFO | |
2511 | "ADDRCONF(NETDEV_UP): %s: " | |
2512 | "link is not ready\n", | |
2513 | dev->name); | |
2514 | break; | |
2515 | } | |
2516 | ||
2517 | if (!idev && dev->mtu >= IPV6_MIN_MTU) | |
2518 | idev = ipv6_add_dev(dev); | |
2519 | ||
2520 | if (idev) { | |
2521 | idev->if_flags |= IF_READY; | |
2522 | run_pending = 1; | |
2523 | } | |
2524 | } else { | |
2525 | if (!addrconf_qdisc_ok(dev)) { | |
2526 | /* device is still not ready. */ | |
2527 | break; | |
2528 | } | |
2529 | ||
2530 | if (idev) { | |
2531 | if (idev->if_flags & IF_READY) | |
2532 | /* device is already configured. */ | |
2533 | break; | |
2534 | idev->if_flags |= IF_READY; | |
2535 | } | |
2536 | ||
2537 | printk(KERN_INFO | |
2538 | "ADDRCONF(NETDEV_CHANGE): %s: " | |
2539 | "link becomes ready\n", | |
2540 | dev->name); | |
2541 | ||
2542 | run_pending = 1; | |
2543 | } | |
2544 | ||
2545 | switch (dev->type) { | |
2546 | #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) | |
2547 | case ARPHRD_SIT: | |
2548 | addrconf_sit_config(dev); | |
2549 | break; | |
2550 | #endif | |
2551 | case ARPHRD_TUNNEL6: | |
2552 | addrconf_ip6_tnl_config(dev); | |
2553 | break; | |
2554 | case ARPHRD_LOOPBACK: | |
2555 | init_loopback(dev); | |
2556 | break; | |
2557 | ||
2558 | default: | |
2559 | addrconf_dev_config(dev); | |
2560 | break; | |
2561 | } | |
2562 | ||
2563 | if (idev) { | |
2564 | if (run_pending) | |
2565 | addrconf_dad_run(idev); | |
2566 | ||
2567 | /* | |
2568 | * If the MTU changed during the interface down, | |
2569 | * when the interface up, the changed MTU must be | |
2570 | * reflected in the idev as well as routers. | |
2571 | */ | |
2572 | if (idev->cnf.mtu6 != dev->mtu && | |
2573 | dev->mtu >= IPV6_MIN_MTU) { | |
2574 | rt6_mtu_change(dev, dev->mtu); | |
2575 | idev->cnf.mtu6 = dev->mtu; | |
2576 | } | |
2577 | idev->tstamp = jiffies; | |
2578 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
2579 | ||
2580 | /* | |
2581 | * If the changed mtu during down is lower than | |
2582 | * IPV6_MIN_MTU stop IPv6 on this interface. | |
2583 | */ | |
2584 | if (dev->mtu < IPV6_MIN_MTU) | |
2585 | addrconf_ifdown(dev, 1); | |
2586 | } | |
2587 | break; | |
2588 | ||
2589 | case NETDEV_CHANGEMTU: | |
2590 | if (idev && dev->mtu >= IPV6_MIN_MTU) { | |
2591 | rt6_mtu_change(dev, dev->mtu); | |
2592 | idev->cnf.mtu6 = dev->mtu; | |
2593 | break; | |
2594 | } | |
2595 | ||
2596 | if (!idev && dev->mtu >= IPV6_MIN_MTU) { | |
2597 | idev = ipv6_add_dev(dev); | |
2598 | if (idev) | |
2599 | break; | |
2600 | } | |
2601 | ||
2602 | /* | |
2603 | * MTU falled under IPV6_MIN_MTU. | |
2604 | * Stop IPv6 on this interface. | |
2605 | */ | |
2606 | ||
2607 | case NETDEV_DOWN: | |
2608 | case NETDEV_UNREGISTER: | |
2609 | /* | |
2610 | * Remove all addresses from this interface. | |
2611 | */ | |
2612 | addrconf_ifdown(dev, event != NETDEV_DOWN); | |
2613 | break; | |
2614 | ||
2615 | case NETDEV_CHANGENAME: | |
2616 | if (idev) { | |
2617 | snmp6_unregister_dev(idev); | |
2618 | addrconf_sysctl_unregister(idev); | |
2619 | addrconf_sysctl_register(idev); | |
2620 | err = snmp6_register_dev(idev); | |
2621 | if (err) | |
2622 | return notifier_from_errno(err); | |
2623 | } | |
2624 | break; | |
2625 | ||
2626 | case NETDEV_PRE_TYPE_CHANGE: | |
2627 | case NETDEV_POST_TYPE_CHANGE: | |
2628 | addrconf_type_change(dev, event); | |
2629 | break; | |
2630 | } | |
2631 | ||
2632 | return NOTIFY_OK; | |
2633 | } | |
2634 | ||
2635 | /* | |
2636 | * addrconf module should be notified of a device going up | |
2637 | */ | |
2638 | static struct notifier_block ipv6_dev_notf = { | |
2639 | .notifier_call = addrconf_notify, | |
2640 | }; | |
2641 | ||
2642 | static void addrconf_type_change(struct net_device *dev, unsigned long event) | |
2643 | { | |
2644 | struct inet6_dev *idev; | |
2645 | ASSERT_RTNL(); | |
2646 | ||
2647 | idev = __in6_dev_get(dev); | |
2648 | ||
2649 | if (event == NETDEV_POST_TYPE_CHANGE) | |
2650 | ipv6_mc_remap(idev); | |
2651 | else if (event == NETDEV_PRE_TYPE_CHANGE) | |
2652 | ipv6_mc_unmap(idev); | |
2653 | } | |
2654 | ||
2655 | static int addrconf_ifdown(struct net_device *dev, int how) | |
2656 | { | |
2657 | struct net *net = dev_net(dev); | |
2658 | struct inet6_dev *idev; | |
2659 | struct inet6_ifaddr *ifa; | |
2660 | LIST_HEAD(keep_list); | |
2661 | int state; | |
2662 | ||
2663 | ASSERT_RTNL(); | |
2664 | ||
2665 | rt6_ifdown(net, dev); | |
2666 | neigh_ifdown(&nd_tbl, dev); | |
2667 | ||
2668 | idev = __in6_dev_get(dev); | |
2669 | if (idev == NULL) | |
2670 | return -ENODEV; | |
2671 | ||
2672 | /* | |
2673 | * Step 1: remove reference to ipv6 device from parent device. | |
2674 | * Do not dev_put! | |
2675 | */ | |
2676 | if (how) { | |
2677 | idev->dead = 1; | |
2678 | ||
2679 | /* protected by rtnl_lock */ | |
2680 | rcu_assign_pointer(dev->ip6_ptr, NULL); | |
2681 | ||
2682 | /* Step 1.5: remove snmp6 entry */ | |
2683 | snmp6_unregister_dev(idev); | |
2684 | ||
2685 | } | |
2686 | ||
2687 | write_lock_bh(&idev->lock); | |
2688 | ||
2689 | /* Step 2: clear flags for stateless addrconf */ | |
2690 | if (!how) | |
2691 | idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); | |
2692 | ||
2693 | #ifdef CONFIG_IPV6_PRIVACY | |
2694 | if (how && del_timer(&idev->regen_timer)) | |
2695 | in6_dev_put(idev); | |
2696 | ||
2697 | /* Step 3: clear tempaddr list */ | |
2698 | while (!list_empty(&idev->tempaddr_list)) { | |
2699 | ifa = list_first_entry(&idev->tempaddr_list, | |
2700 | struct inet6_ifaddr, tmp_list); | |
2701 | list_del(&ifa->tmp_list); | |
2702 | write_unlock_bh(&idev->lock); | |
2703 | spin_lock_bh(&ifa->lock); | |
2704 | ||
2705 | if (ifa->ifpub) { | |
2706 | in6_ifa_put(ifa->ifpub); | |
2707 | ifa->ifpub = NULL; | |
2708 | } | |
2709 | spin_unlock_bh(&ifa->lock); | |
2710 | in6_ifa_put(ifa); | |
2711 | write_lock_bh(&idev->lock); | |
2712 | } | |
2713 | #endif | |
2714 | ||
2715 | while (!list_empty(&idev->addr_list)) { | |
2716 | ifa = list_first_entry(&idev->addr_list, | |
2717 | struct inet6_ifaddr, if_list); | |
2718 | addrconf_del_timer(ifa); | |
2719 | ||
2720 | /* If just doing link down, and address is permanent | |
2721 | and not link-local, then retain it. */ | |
2722 | if (!how && | |
2723 | (ifa->flags&IFA_F_PERMANENT) && | |
2724 | !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) { | |
2725 | list_move_tail(&ifa->if_list, &keep_list); | |
2726 | ||
2727 | /* If not doing DAD on this address, just keep it. */ | |
2728 | if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) || | |
2729 | idev->cnf.accept_dad <= 0 || | |
2730 | (ifa->flags & IFA_F_NODAD)) | |
2731 | continue; | |
2732 | ||
2733 | /* If it was tentative already, no need to notify */ | |
2734 | if (ifa->flags & IFA_F_TENTATIVE) | |
2735 | continue; | |
2736 | ||
2737 | /* Flag it for later restoration when link comes up */ | |
2738 | ifa->flags |= IFA_F_TENTATIVE; | |
2739 | ifa->state = INET6_IFADDR_STATE_DAD; | |
2740 | ||
2741 | write_unlock_bh(&idev->lock); | |
2742 | ||
2743 | in6_ifa_hold(ifa); | |
2744 | } else { | |
2745 | list_del(&ifa->if_list); | |
2746 | ||
2747 | /* clear hash table */ | |
2748 | spin_lock_bh(&addrconf_hash_lock); | |
2749 | hlist_del_init_rcu(&ifa->addr_lst); | |
2750 | spin_unlock_bh(&addrconf_hash_lock); | |
2751 | ||
2752 | write_unlock_bh(&idev->lock); | |
2753 | spin_lock_bh(&ifa->state_lock); | |
2754 | state = ifa->state; | |
2755 | ifa->state = INET6_IFADDR_STATE_DEAD; | |
2756 | spin_unlock_bh(&ifa->state_lock); | |
2757 | ||
2758 | if (state == INET6_IFADDR_STATE_DEAD) | |
2759 | goto put_ifa; | |
2760 | } | |
2761 | ||
2762 | __ipv6_ifa_notify(RTM_DELADDR, ifa); | |
2763 | if (ifa->state == INET6_IFADDR_STATE_DEAD) | |
2764 | atomic_notifier_call_chain(&inet6addr_chain, | |
2765 | NETDEV_DOWN, ifa); | |
2766 | ||
2767 | put_ifa: | |
2768 | in6_ifa_put(ifa); | |
2769 | ||
2770 | write_lock_bh(&idev->lock); | |
2771 | } | |
2772 | ||
2773 | list_splice(&keep_list, &idev->addr_list); | |
2774 | ||
2775 | write_unlock_bh(&idev->lock); | |
2776 | ||
2777 | /* Step 5: Discard multicast list */ | |
2778 | if (how) | |
2779 | ipv6_mc_destroy_dev(idev); | |
2780 | else | |
2781 | ipv6_mc_down(idev); | |
2782 | ||
2783 | idev->tstamp = jiffies; | |
2784 | ||
2785 | /* Last: Shot the device (if unregistered) */ | |
2786 | if (how) { | |
2787 | addrconf_sysctl_unregister(idev); | |
2788 | neigh_parms_release(&nd_tbl, idev->nd_parms); | |
2789 | neigh_ifdown(&nd_tbl, dev); | |
2790 | in6_dev_put(idev); | |
2791 | } | |
2792 | return 0; | |
2793 | } | |
2794 | ||
2795 | static void addrconf_rs_timer(unsigned long data) | |
2796 | { | |
2797 | struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; | |
2798 | struct inet6_dev *idev = ifp->idev; | |
2799 | ||
2800 | read_lock(&idev->lock); | |
2801 | if (idev->dead || !(idev->if_flags & IF_READY)) | |
2802 | goto out; | |
2803 | ||
2804 | if (idev->cnf.forwarding) | |
2805 | goto out; | |
2806 | ||
2807 | /* Announcement received after solicitation was sent */ | |
2808 | if (idev->if_flags & IF_RA_RCVD) | |
2809 | goto out; | |
2810 | ||
2811 | spin_lock(&ifp->lock); | |
2812 | if (ifp->probes++ < idev->cnf.rtr_solicits) { | |
2813 | /* The wait after the last probe can be shorter */ | |
2814 | addrconf_mod_timer(ifp, AC_RS, | |
2815 | (ifp->probes == idev->cnf.rtr_solicits) ? | |
2816 | idev->cnf.rtr_solicit_delay : | |
2817 | idev->cnf.rtr_solicit_interval); | |
2818 | spin_unlock(&ifp->lock); | |
2819 | ||
2820 | ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); | |
2821 | } else { | |
2822 | spin_unlock(&ifp->lock); | |
2823 | /* | |
2824 | * Note: we do not support deprecated "all on-link" | |
2825 | * assumption any longer. | |
2826 | */ | |
2827 | printk(KERN_DEBUG "%s: no IPv6 routers present\n", | |
2828 | idev->dev->name); | |
2829 | } | |
2830 | ||
2831 | out: | |
2832 | read_unlock(&idev->lock); | |
2833 | in6_ifa_put(ifp); | |
2834 | } | |
2835 | ||
2836 | /* | |
2837 | * Duplicate Address Detection | |
2838 | */ | |
2839 | static void addrconf_dad_kick(struct inet6_ifaddr *ifp) | |
2840 | { | |
2841 | unsigned long rand_num; | |
2842 | struct inet6_dev *idev = ifp->idev; | |
2843 | ||
2844 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
2845 | rand_num = 0; | |
2846 | else | |
2847 | rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); | |
2848 | ||
2849 | ifp->probes = idev->cnf.dad_transmits; | |
2850 | addrconf_mod_timer(ifp, AC_DAD, rand_num); | |
2851 | } | |
2852 | ||
2853 | static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) | |
2854 | { | |
2855 | struct inet6_dev *idev = ifp->idev; | |
2856 | struct net_device *dev = idev->dev; | |
2857 | ||
2858 | addrconf_join_solict(dev, &ifp->addr); | |
2859 | ||
2860 | net_srandom(ifp->addr.s6_addr32[3]); | |
2861 | ||
2862 | read_lock_bh(&idev->lock); | |
2863 | spin_lock(&ifp->lock); | |
2864 | if (ifp->state == INET6_IFADDR_STATE_DEAD) | |
2865 | goto out; | |
2866 | ||
2867 | if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || | |
2868 | idev->cnf.accept_dad < 1 || | |
2869 | !(ifp->flags&IFA_F_TENTATIVE) || | |
2870 | ifp->flags & IFA_F_NODAD) { | |
2871 | ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); | |
2872 | spin_unlock(&ifp->lock); | |
2873 | read_unlock_bh(&idev->lock); | |
2874 | ||
2875 | addrconf_dad_completed(ifp); | |
2876 | return; | |
2877 | } | |
2878 | ||
2879 | if (!(idev->if_flags & IF_READY)) { | |
2880 | spin_unlock(&ifp->lock); | |
2881 | read_unlock_bh(&idev->lock); | |
2882 | /* | |
2883 | * If the device is not ready: | |
2884 | * - keep it tentative if it is a permanent address. | |
2885 | * - otherwise, kill it. | |
2886 | */ | |
2887 | in6_ifa_hold(ifp); | |
2888 | addrconf_dad_stop(ifp, 0); | |
2889 | return; | |
2890 | } | |
2891 | ||
2892 | /* | |
2893 | * Optimistic nodes can start receiving | |
2894 | * Frames right away | |
2895 | */ | |
2896 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
2897 | ip6_ins_rt(ifp->rt); | |
2898 | ||
2899 | addrconf_dad_kick(ifp); | |
2900 | out: | |
2901 | spin_unlock(&ifp->lock); | |
2902 | read_unlock_bh(&idev->lock); | |
2903 | } | |
2904 | ||
2905 | static void addrconf_dad_timer(unsigned long data) | |
2906 | { | |
2907 | struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; | |
2908 | struct inet6_dev *idev = ifp->idev; | |
2909 | struct in6_addr mcaddr; | |
2910 | ||
2911 | if (!ifp->probes && addrconf_dad_end(ifp)) | |
2912 | goto out; | |
2913 | ||
2914 | read_lock(&idev->lock); | |
2915 | if (idev->dead || !(idev->if_flags & IF_READY)) { | |
2916 | read_unlock(&idev->lock); | |
2917 | goto out; | |
2918 | } | |
2919 | ||
2920 | spin_lock(&ifp->lock); | |
2921 | if (ifp->state == INET6_IFADDR_STATE_DEAD) { | |
2922 | spin_unlock(&ifp->lock); | |
2923 | read_unlock(&idev->lock); | |
2924 | goto out; | |
2925 | } | |
2926 | ||
2927 | if (ifp->probes == 0) { | |
2928 | /* | |
2929 | * DAD was successful | |
2930 | */ | |
2931 | ||
2932 | ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); | |
2933 | spin_unlock(&ifp->lock); | |
2934 | read_unlock(&idev->lock); | |
2935 | ||
2936 | addrconf_dad_completed(ifp); | |
2937 | ||
2938 | goto out; | |
2939 | } | |
2940 | ||
2941 | ifp->probes--; | |
2942 | addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); | |
2943 | spin_unlock(&ifp->lock); | |
2944 | read_unlock(&idev->lock); | |
2945 | ||
2946 | /* send a neighbour solicitation for our addr */ | |
2947 | addrconf_addr_solict_mult(&ifp->addr, &mcaddr); | |
2948 | ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); | |
2949 | out: | |
2950 | in6_ifa_put(ifp); | |
2951 | } | |
2952 | ||
2953 | static void addrconf_dad_completed(struct inet6_ifaddr *ifp) | |
2954 | { | |
2955 | struct net_device *dev = ifp->idev->dev; | |
2956 | ||
2957 | /* | |
2958 | * Configure the address for reception. Now it is valid. | |
2959 | */ | |
2960 | ||
2961 | ipv6_ifa_notify(RTM_NEWADDR, ifp); | |
2962 | ||
2963 | /* If added prefix is link local and forwarding is off, | |
2964 | start sending router solicitations. | |
2965 | */ | |
2966 | ||
2967 | if (ifp->idev->cnf.forwarding == 0 && | |
2968 | ifp->idev->cnf.rtr_solicits > 0 && | |
2969 | (dev->flags&IFF_LOOPBACK) == 0 && | |
2970 | (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { | |
2971 | /* | |
2972 | * If a host as already performed a random delay | |
2973 | * [...] as part of DAD [...] there is no need | |
2974 | * to delay again before sending the first RS | |
2975 | */ | |
2976 | ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); | |
2977 | ||
2978 | spin_lock_bh(&ifp->lock); | |
2979 | ifp->probes = 1; | |
2980 | ifp->idev->if_flags |= IF_RS_SENT; | |
2981 | addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); | |
2982 | spin_unlock_bh(&ifp->lock); | |
2983 | } | |
2984 | } | |
2985 | ||
2986 | static void addrconf_dad_run(struct inet6_dev *idev) | |
2987 | { | |
2988 | struct inet6_ifaddr *ifp; | |
2989 | ||
2990 | read_lock_bh(&idev->lock); | |
2991 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
2992 | spin_lock(&ifp->lock); | |
2993 | if (ifp->flags & IFA_F_TENTATIVE && | |
2994 | ifp->state == INET6_IFADDR_STATE_DAD) | |
2995 | addrconf_dad_kick(ifp); | |
2996 | spin_unlock(&ifp->lock); | |
2997 | } | |
2998 | read_unlock_bh(&idev->lock); | |
2999 | } | |
3000 | ||
3001 | #ifdef CONFIG_PROC_FS | |
3002 | struct if6_iter_state { | |
3003 | struct seq_net_private p; | |
3004 | int bucket; | |
3005 | }; | |
3006 | ||
3007 | static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) | |
3008 | { | |
3009 | struct inet6_ifaddr *ifa = NULL; | |
3010 | struct if6_iter_state *state = seq->private; | |
3011 | struct net *net = seq_file_net(seq); | |
3012 | ||
3013 | for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { | |
3014 | struct hlist_node *n; | |
3015 | hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], | |
3016 | addr_lst) | |
3017 | if (net_eq(dev_net(ifa->idev->dev), net)) | |
3018 | return ifa; | |
3019 | } | |
3020 | return NULL; | |
3021 | } | |
3022 | ||
3023 | static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, | |
3024 | struct inet6_ifaddr *ifa) | |
3025 | { | |
3026 | struct if6_iter_state *state = seq->private; | |
3027 | struct net *net = seq_file_net(seq); | |
3028 | struct hlist_node *n = &ifa->addr_lst; | |
3029 | ||
3030 | hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) | |
3031 | if (net_eq(dev_net(ifa->idev->dev), net)) | |
3032 | return ifa; | |
3033 | ||
3034 | while (++state->bucket < IN6_ADDR_HSIZE) { | |
3035 | hlist_for_each_entry_rcu_bh(ifa, n, | |
3036 | &inet6_addr_lst[state->bucket], addr_lst) { | |
3037 | if (net_eq(dev_net(ifa->idev->dev), net)) | |
3038 | return ifa; | |
3039 | } | |
3040 | } | |
3041 | ||
3042 | return NULL; | |
3043 | } | |
3044 | ||
3045 | static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) | |
3046 | { | |
3047 | struct inet6_ifaddr *ifa = if6_get_first(seq); | |
3048 | ||
3049 | if (ifa) | |
3050 | while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) | |
3051 | --pos; | |
3052 | return pos ? NULL : ifa; | |
3053 | } | |
3054 | ||
3055 | static void *if6_seq_start(struct seq_file *seq, loff_t *pos) | |
3056 | __acquires(rcu_bh) | |
3057 | { | |
3058 | rcu_read_lock_bh(); | |
3059 | return if6_get_idx(seq, *pos); | |
3060 | } | |
3061 | ||
3062 | static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3063 | { | |
3064 | struct inet6_ifaddr *ifa; | |
3065 | ||
3066 | ifa = if6_get_next(seq, v); | |
3067 | ++*pos; | |
3068 | return ifa; | |
3069 | } | |
3070 | ||
3071 | static void if6_seq_stop(struct seq_file *seq, void *v) | |
3072 | __releases(rcu_bh) | |
3073 | { | |
3074 | rcu_read_unlock_bh(); | |
3075 | } | |
3076 | ||
3077 | static int if6_seq_show(struct seq_file *seq, void *v) | |
3078 | { | |
3079 | struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; | |
3080 | seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", | |
3081 | &ifp->addr, | |
3082 | ifp->idev->dev->ifindex, | |
3083 | ifp->prefix_len, | |
3084 | ifp->scope, | |
3085 | ifp->flags, | |
3086 | ifp->idev->dev->name); | |
3087 | return 0; | |
3088 | } | |
3089 | ||
3090 | static const struct seq_operations if6_seq_ops = { | |
3091 | .start = if6_seq_start, | |
3092 | .next = if6_seq_next, | |
3093 | .show = if6_seq_show, | |
3094 | .stop = if6_seq_stop, | |
3095 | }; | |
3096 | ||
3097 | static int if6_seq_open(struct inode *inode, struct file *file) | |
3098 | { | |
3099 | return seq_open_net(inode, file, &if6_seq_ops, | |
3100 | sizeof(struct if6_iter_state)); | |
3101 | } | |
3102 | ||
3103 | static const struct file_operations if6_fops = { | |
3104 | .owner = THIS_MODULE, | |
3105 | .open = if6_seq_open, | |
3106 | .read = seq_read, | |
3107 | .llseek = seq_lseek, | |
3108 | .release = seq_release_net, | |
3109 | }; | |
3110 | ||
3111 | static int __net_init if6_proc_net_init(struct net *net) | |
3112 | { | |
3113 | if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) | |
3114 | return -ENOMEM; | |
3115 | return 0; | |
3116 | } | |
3117 | ||
3118 | static void __net_exit if6_proc_net_exit(struct net *net) | |
3119 | { | |
3120 | proc_net_remove(net, "if_inet6"); | |
3121 | } | |
3122 | ||
3123 | static struct pernet_operations if6_proc_net_ops = { | |
3124 | .init = if6_proc_net_init, | |
3125 | .exit = if6_proc_net_exit, | |
3126 | }; | |
3127 | ||
3128 | int __init if6_proc_init(void) | |
3129 | { | |
3130 | return register_pernet_subsys(&if6_proc_net_ops); | |
3131 | } | |
3132 | ||
3133 | void if6_proc_exit(void) | |
3134 | { | |
3135 | unregister_pernet_subsys(&if6_proc_net_ops); | |
3136 | } | |
3137 | #endif /* CONFIG_PROC_FS */ | |
3138 | ||
3139 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) | |
3140 | /* Check if address is a home address configured on any interface. */ | |
3141 | int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) | |
3142 | { | |
3143 | int ret = 0; | |
3144 | struct inet6_ifaddr *ifp = NULL; | |
3145 | struct hlist_node *n; | |
3146 | unsigned int hash = ipv6_addr_hash(addr); | |
3147 | ||
3148 | rcu_read_lock_bh(); | |
3149 | hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { | |
3150 | if (!net_eq(dev_net(ifp->idev->dev), net)) | |
3151 | continue; | |
3152 | if (ipv6_addr_equal(&ifp->addr, addr) && | |
3153 | (ifp->flags & IFA_F_HOMEADDRESS)) { | |
3154 | ret = 1; | |
3155 | break; | |
3156 | } | |
3157 | } | |
3158 | rcu_read_unlock_bh(); | |
3159 | return ret; | |
3160 | } | |
3161 | #endif | |
3162 | ||
3163 | /* | |
3164 | * Periodic address status verification | |
3165 | */ | |
3166 | ||
3167 | static void addrconf_verify(unsigned long foo) | |
3168 | { | |
3169 | unsigned long now, next, next_sec, next_sched; | |
3170 | struct inet6_ifaddr *ifp; | |
3171 | struct hlist_node *node; | |
3172 | int i; | |
3173 | ||
3174 | rcu_read_lock_bh(); | |
3175 | spin_lock(&addrconf_verify_lock); | |
3176 | now = jiffies; | |
3177 | next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); | |
3178 | ||
3179 | del_timer(&addr_chk_timer); | |
3180 | ||
3181 | for (i = 0; i < IN6_ADDR_HSIZE; i++) { | |
3182 | restart: | |
3183 | hlist_for_each_entry_rcu_bh(ifp, node, | |
3184 | &inet6_addr_lst[i], addr_lst) { | |
3185 | unsigned long age; | |
3186 | ||
3187 | if (ifp->flags & IFA_F_PERMANENT) | |
3188 | continue; | |
3189 | ||
3190 | spin_lock(&ifp->lock); | |
3191 | /* We try to batch several events at once. */ | |
3192 | age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
3193 | ||
3194 | if (ifp->valid_lft != INFINITY_LIFE_TIME && | |
3195 | age >= ifp->valid_lft) { | |
3196 | spin_unlock(&ifp->lock); | |
3197 | in6_ifa_hold(ifp); | |
3198 | ipv6_del_addr(ifp); | |
3199 | goto restart; | |
3200 | } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { | |
3201 | spin_unlock(&ifp->lock); | |
3202 | continue; | |
3203 | } else if (age >= ifp->prefered_lft) { | |
3204 | /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ | |
3205 | int deprecate = 0; | |
3206 | ||
3207 | if (!(ifp->flags&IFA_F_DEPRECATED)) { | |
3208 | deprecate = 1; | |
3209 | ifp->flags |= IFA_F_DEPRECATED; | |
3210 | } | |
3211 | ||
3212 | if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) | |
3213 | next = ifp->tstamp + ifp->valid_lft * HZ; | |
3214 | ||
3215 | spin_unlock(&ifp->lock); | |
3216 | ||
3217 | if (deprecate) { | |
3218 | in6_ifa_hold(ifp); | |
3219 | ||
3220 | ipv6_ifa_notify(0, ifp); | |
3221 | in6_ifa_put(ifp); | |
3222 | goto restart; | |
3223 | } | |
3224 | #ifdef CONFIG_IPV6_PRIVACY | |
3225 | } else if ((ifp->flags&IFA_F_TEMPORARY) && | |
3226 | !(ifp->flags&IFA_F_TENTATIVE)) { | |
3227 | unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * | |
3228 | ifp->idev->cnf.dad_transmits * | |
3229 | ifp->idev->nd_parms->retrans_time / HZ; | |
3230 | ||
3231 | if (age >= ifp->prefered_lft - regen_advance) { | |
3232 | struct inet6_ifaddr *ifpub = ifp->ifpub; | |
3233 | if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) | |
3234 | next = ifp->tstamp + ifp->prefered_lft * HZ; | |
3235 | if (!ifp->regen_count && ifpub) { | |
3236 | ifp->regen_count++; | |
3237 | in6_ifa_hold(ifp); | |
3238 | in6_ifa_hold(ifpub); | |
3239 | spin_unlock(&ifp->lock); | |
3240 | ||
3241 | spin_lock(&ifpub->lock); | |
3242 | ifpub->regen_count = 0; | |
3243 | spin_unlock(&ifpub->lock); | |
3244 | ipv6_create_tempaddr(ifpub, ifp); | |
3245 | in6_ifa_put(ifpub); | |
3246 | in6_ifa_put(ifp); | |
3247 | goto restart; | |
3248 | } | |
3249 | } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) | |
3250 | next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; | |
3251 | spin_unlock(&ifp->lock); | |
3252 | #endif | |
3253 | } else { | |
3254 | /* ifp->prefered_lft <= ifp->valid_lft */ | |
3255 | if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) | |
3256 | next = ifp->tstamp + ifp->prefered_lft * HZ; | |
3257 | spin_unlock(&ifp->lock); | |
3258 | } | |
3259 | } | |
3260 | } | |
3261 | ||
3262 | next_sec = round_jiffies_up(next); | |
3263 | next_sched = next; | |
3264 | ||
3265 | /* If rounded timeout is accurate enough, accept it. */ | |
3266 | if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) | |
3267 | next_sched = next_sec; | |
3268 | ||
3269 | /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ | |
3270 | if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) | |
3271 | next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; | |
3272 | ||
3273 | ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", | |
3274 | now, next, next_sec, next_sched)); | |
3275 | ||
3276 | addr_chk_timer.expires = next_sched; | |
3277 | add_timer(&addr_chk_timer); | |
3278 | spin_unlock(&addrconf_verify_lock); | |
3279 | rcu_read_unlock_bh(); | |
3280 | } | |
3281 | ||
3282 | static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) | |
3283 | { | |
3284 | struct in6_addr *pfx = NULL; | |
3285 | ||
3286 | if (addr) | |
3287 | pfx = nla_data(addr); | |
3288 | ||
3289 | if (local) { | |
3290 | if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) | |
3291 | pfx = NULL; | |
3292 | else | |
3293 | pfx = nla_data(local); | |
3294 | } | |
3295 | ||
3296 | return pfx; | |
3297 | } | |
3298 | ||
3299 | static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { | |
3300 | [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, | |
3301 | [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
3302 | [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, | |
3303 | }; | |
3304 | ||
3305 | static int | |
3306 | inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
3307 | { | |
3308 | struct net *net = sock_net(skb->sk); | |
3309 | struct ifaddrmsg *ifm; | |
3310 | struct nlattr *tb[IFA_MAX+1]; | |
3311 | struct in6_addr *pfx; | |
3312 | int err; | |
3313 | ||
3314 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); | |
3315 | if (err < 0) | |
3316 | return err; | |
3317 | ||
3318 | ifm = nlmsg_data(nlh); | |
3319 | pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); | |
3320 | if (pfx == NULL) | |
3321 | return -EINVAL; | |
3322 | ||
3323 | return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); | |
3324 | } | |
3325 | ||
3326 | static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, | |
3327 | u32 prefered_lft, u32 valid_lft) | |
3328 | { | |
3329 | u32 flags; | |
3330 | clock_t expires; | |
3331 | unsigned long timeout; | |
3332 | ||
3333 | if (!valid_lft || (prefered_lft > valid_lft)) | |
3334 | return -EINVAL; | |
3335 | ||
3336 | timeout = addrconf_timeout_fixup(valid_lft, HZ); | |
3337 | if (addrconf_finite_timeout(timeout)) { | |
3338 | expires = jiffies_to_clock_t(timeout * HZ); | |
3339 | valid_lft = timeout; | |
3340 | flags = RTF_EXPIRES; | |
3341 | } else { | |
3342 | expires = 0; | |
3343 | flags = 0; | |
3344 | ifa_flags |= IFA_F_PERMANENT; | |
3345 | } | |
3346 | ||
3347 | timeout = addrconf_timeout_fixup(prefered_lft, HZ); | |
3348 | if (addrconf_finite_timeout(timeout)) { | |
3349 | if (timeout == 0) | |
3350 | ifa_flags |= IFA_F_DEPRECATED; | |
3351 | prefered_lft = timeout; | |
3352 | } | |
3353 | ||
3354 | spin_lock_bh(&ifp->lock); | |
3355 | ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; | |
3356 | ifp->tstamp = jiffies; | |
3357 | ifp->valid_lft = valid_lft; | |
3358 | ifp->prefered_lft = prefered_lft; | |
3359 | ||
3360 | spin_unlock_bh(&ifp->lock); | |
3361 | if (!(ifp->flags&IFA_F_TENTATIVE)) | |
3362 | ipv6_ifa_notify(0, ifp); | |
3363 | ||
3364 | addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, | |
3365 | expires, flags); | |
3366 | addrconf_verify(0); | |
3367 | ||
3368 | return 0; | |
3369 | } | |
3370 | ||
3371 | static int | |
3372 | inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
3373 | { | |
3374 | struct net *net = sock_net(skb->sk); | |
3375 | struct ifaddrmsg *ifm; | |
3376 | struct nlattr *tb[IFA_MAX+1]; | |
3377 | struct in6_addr *pfx; | |
3378 | struct inet6_ifaddr *ifa; | |
3379 | struct net_device *dev; | |
3380 | u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; | |
3381 | u8 ifa_flags; | |
3382 | int err; | |
3383 | ||
3384 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); | |
3385 | if (err < 0) | |
3386 | return err; | |
3387 | ||
3388 | ifm = nlmsg_data(nlh); | |
3389 | pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); | |
3390 | if (pfx == NULL) | |
3391 | return -EINVAL; | |
3392 | ||
3393 | if (tb[IFA_CACHEINFO]) { | |
3394 | struct ifa_cacheinfo *ci; | |
3395 | ||
3396 | ci = nla_data(tb[IFA_CACHEINFO]); | |
3397 | valid_lft = ci->ifa_valid; | |
3398 | preferred_lft = ci->ifa_prefered; | |
3399 | } else { | |
3400 | preferred_lft = INFINITY_LIFE_TIME; | |
3401 | valid_lft = INFINITY_LIFE_TIME; | |
3402 | } | |
3403 | ||
3404 | dev = __dev_get_by_index(net, ifm->ifa_index); | |
3405 | if (dev == NULL) | |
3406 | return -ENODEV; | |
3407 | ||
3408 | /* We ignore other flags so far. */ | |
3409 | ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); | |
3410 | ||
3411 | ifa = ipv6_get_ifaddr(net, pfx, dev, 1); | |
3412 | if (ifa == NULL) { | |
3413 | /* | |
3414 | * It would be best to check for !NLM_F_CREATE here but | |
3415 | * userspace alreay relies on not having to provide this. | |
3416 | */ | |
3417 | return inet6_addr_add(net, ifm->ifa_index, pfx, | |
3418 | ifm->ifa_prefixlen, ifa_flags, | |
3419 | preferred_lft, valid_lft); | |
3420 | } | |
3421 | ||
3422 | if (nlh->nlmsg_flags & NLM_F_EXCL || | |
3423 | !(nlh->nlmsg_flags & NLM_F_REPLACE)) | |
3424 | err = -EEXIST; | |
3425 | else | |
3426 | err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); | |
3427 | ||
3428 | in6_ifa_put(ifa); | |
3429 | ||
3430 | return err; | |
3431 | } | |
3432 | ||
3433 | static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, | |
3434 | u8 scope, int ifindex) | |
3435 | { | |
3436 | struct ifaddrmsg *ifm; | |
3437 | ||
3438 | ifm = nlmsg_data(nlh); | |
3439 | ifm->ifa_family = AF_INET6; | |
3440 | ifm->ifa_prefixlen = prefixlen; | |
3441 | ifm->ifa_flags = flags; | |
3442 | ifm->ifa_scope = scope; | |
3443 | ifm->ifa_index = ifindex; | |
3444 | } | |
3445 | ||
3446 | static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, | |
3447 | unsigned long tstamp, u32 preferred, u32 valid) | |
3448 | { | |
3449 | struct ifa_cacheinfo ci; | |
3450 | ||
3451 | ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 | |
3452 | + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); | |
3453 | ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 | |
3454 | + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); | |
3455 | ci.ifa_prefered = preferred; | |
3456 | ci.ifa_valid = valid; | |
3457 | ||
3458 | return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); | |
3459 | } | |
3460 | ||
3461 | static inline int rt_scope(int ifa_scope) | |
3462 | { | |
3463 | if (ifa_scope & IFA_HOST) | |
3464 | return RT_SCOPE_HOST; | |
3465 | else if (ifa_scope & IFA_LINK) | |
3466 | return RT_SCOPE_LINK; | |
3467 | else if (ifa_scope & IFA_SITE) | |
3468 | return RT_SCOPE_SITE; | |
3469 | else | |
3470 | return RT_SCOPE_UNIVERSE; | |
3471 | } | |
3472 | ||
3473 | static inline int inet6_ifaddr_msgsize(void) | |
3474 | { | |
3475 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
3476 | + nla_total_size(16) /* IFA_ADDRESS */ | |
3477 | + nla_total_size(sizeof(struct ifa_cacheinfo)); | |
3478 | } | |
3479 | ||
3480 | static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, | |
3481 | u32 pid, u32 seq, int event, unsigned int flags) | |
3482 | { | |
3483 | struct nlmsghdr *nlh; | |
3484 | u32 preferred, valid; | |
3485 | ||
3486 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); | |
3487 | if (nlh == NULL) | |
3488 | return -EMSGSIZE; | |
3489 | ||
3490 | put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), | |
3491 | ifa->idev->dev->ifindex); | |
3492 | ||
3493 | if (!(ifa->flags&IFA_F_PERMANENT)) { | |
3494 | preferred = ifa->prefered_lft; | |
3495 | valid = ifa->valid_lft; | |
3496 | if (preferred != INFINITY_LIFE_TIME) { | |
3497 | long tval = (jiffies - ifa->tstamp)/HZ; | |
3498 | if (preferred > tval) | |
3499 | preferred -= tval; | |
3500 | else | |
3501 | preferred = 0; | |
3502 | if (valid != INFINITY_LIFE_TIME) { | |
3503 | if (valid > tval) | |
3504 | valid -= tval; | |
3505 | else | |
3506 | valid = 0; | |
3507 | } | |
3508 | } | |
3509 | } else { | |
3510 | preferred = INFINITY_LIFE_TIME; | |
3511 | valid = INFINITY_LIFE_TIME; | |
3512 | } | |
3513 | ||
3514 | if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || | |
3515 | put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { | |
3516 | nlmsg_cancel(skb, nlh); | |
3517 | return -EMSGSIZE; | |
3518 | } | |
3519 | ||
3520 | return nlmsg_end(skb, nlh); | |
3521 | } | |
3522 | ||
3523 | static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, | |
3524 | u32 pid, u32 seq, int event, u16 flags) | |
3525 | { | |
3526 | struct nlmsghdr *nlh; | |
3527 | u8 scope = RT_SCOPE_UNIVERSE; | |
3528 | int ifindex = ifmca->idev->dev->ifindex; | |
3529 | ||
3530 | if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) | |
3531 | scope = RT_SCOPE_SITE; | |
3532 | ||
3533 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); | |
3534 | if (nlh == NULL) | |
3535 | return -EMSGSIZE; | |
3536 | ||
3537 | put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); | |
3538 | if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || | |
3539 | put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, | |
3540 | INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { | |
3541 | nlmsg_cancel(skb, nlh); | |
3542 | return -EMSGSIZE; | |
3543 | } | |
3544 | ||
3545 | return nlmsg_end(skb, nlh); | |
3546 | } | |
3547 | ||
3548 | static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, | |
3549 | u32 pid, u32 seq, int event, unsigned int flags) | |
3550 | { | |
3551 | struct nlmsghdr *nlh; | |
3552 | u8 scope = RT_SCOPE_UNIVERSE; | |
3553 | int ifindex = ifaca->aca_idev->dev->ifindex; | |
3554 | ||
3555 | if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) | |
3556 | scope = RT_SCOPE_SITE; | |
3557 | ||
3558 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); | |
3559 | if (nlh == NULL) | |
3560 | return -EMSGSIZE; | |
3561 | ||
3562 | put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); | |
3563 | if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || | |
3564 | put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, | |
3565 | INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { | |
3566 | nlmsg_cancel(skb, nlh); | |
3567 | return -EMSGSIZE; | |
3568 | } | |
3569 | ||
3570 | return nlmsg_end(skb, nlh); | |
3571 | } | |
3572 | ||
3573 | enum addr_type_t { | |
3574 | UNICAST_ADDR, | |
3575 | MULTICAST_ADDR, | |
3576 | ANYCAST_ADDR, | |
3577 | }; | |
3578 | ||
3579 | /* called with rcu_read_lock() */ | |
3580 | static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, | |
3581 | struct netlink_callback *cb, enum addr_type_t type, | |
3582 | int s_ip_idx, int *p_ip_idx) | |
3583 | { | |
3584 | struct ifmcaddr6 *ifmca; | |
3585 | struct ifacaddr6 *ifaca; | |
3586 | int err = 1; | |
3587 | int ip_idx = *p_ip_idx; | |
3588 | ||
3589 | read_lock_bh(&idev->lock); | |
3590 | switch (type) { | |
3591 | case UNICAST_ADDR: { | |
3592 | struct inet6_ifaddr *ifa; | |
3593 | ||
3594 | /* unicast address incl. temp addr */ | |
3595 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
3596 | if (++ip_idx < s_ip_idx) | |
3597 | continue; | |
3598 | err = inet6_fill_ifaddr(skb, ifa, | |
3599 | NETLINK_CB(cb->skb).pid, | |
3600 | cb->nlh->nlmsg_seq, | |
3601 | RTM_NEWADDR, | |
3602 | NLM_F_MULTI); | |
3603 | if (err <= 0) | |
3604 | break; | |
3605 | } | |
3606 | break; | |
3607 | } | |
3608 | case MULTICAST_ADDR: | |
3609 | /* multicast address */ | |
3610 | for (ifmca = idev->mc_list; ifmca; | |
3611 | ifmca = ifmca->next, ip_idx++) { | |
3612 | if (ip_idx < s_ip_idx) | |
3613 | continue; | |
3614 | err = inet6_fill_ifmcaddr(skb, ifmca, | |
3615 | NETLINK_CB(cb->skb).pid, | |
3616 | cb->nlh->nlmsg_seq, | |
3617 | RTM_GETMULTICAST, | |
3618 | NLM_F_MULTI); | |
3619 | if (err <= 0) | |
3620 | break; | |
3621 | } | |
3622 | break; | |
3623 | case ANYCAST_ADDR: | |
3624 | /* anycast address */ | |
3625 | for (ifaca = idev->ac_list; ifaca; | |
3626 | ifaca = ifaca->aca_next, ip_idx++) { | |
3627 | if (ip_idx < s_ip_idx) | |
3628 | continue; | |
3629 | err = inet6_fill_ifacaddr(skb, ifaca, | |
3630 | NETLINK_CB(cb->skb).pid, | |
3631 | cb->nlh->nlmsg_seq, | |
3632 | RTM_GETANYCAST, | |
3633 | NLM_F_MULTI); | |
3634 | if (err <= 0) | |
3635 | break; | |
3636 | } | |
3637 | break; | |
3638 | default: | |
3639 | break; | |
3640 | } | |
3641 | read_unlock_bh(&idev->lock); | |
3642 | *p_ip_idx = ip_idx; | |
3643 | return err; | |
3644 | } | |
3645 | ||
3646 | static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, | |
3647 | enum addr_type_t type) | |
3648 | { | |
3649 | struct net *net = sock_net(skb->sk); | |
3650 | int h, s_h; | |
3651 | int idx, ip_idx; | |
3652 | int s_idx, s_ip_idx; | |
3653 | struct net_device *dev; | |
3654 | struct inet6_dev *idev; | |
3655 | struct hlist_head *head; | |
3656 | struct hlist_node *node; | |
3657 | ||
3658 | s_h = cb->args[0]; | |
3659 | s_idx = idx = cb->args[1]; | |
3660 | s_ip_idx = ip_idx = cb->args[2]; | |
3661 | ||
3662 | rcu_read_lock(); | |
3663 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
3664 | idx = 0; | |
3665 | head = &net->dev_index_head[h]; | |
3666 | hlist_for_each_entry_rcu(dev, node, head, index_hlist) { | |
3667 | if (idx < s_idx) | |
3668 | goto cont; | |
3669 | if (h > s_h || idx > s_idx) | |
3670 | s_ip_idx = 0; | |
3671 | ip_idx = 0; | |
3672 | idev = __in6_dev_get(dev); | |
3673 | if (!idev) | |
3674 | goto cont; | |
3675 | ||
3676 | if (in6_dump_addrs(idev, skb, cb, type, | |
3677 | s_ip_idx, &ip_idx) <= 0) | |
3678 | goto done; | |
3679 | cont: | |
3680 | idx++; | |
3681 | } | |
3682 | } | |
3683 | done: | |
3684 | rcu_read_unlock(); | |
3685 | cb->args[0] = h; | |
3686 | cb->args[1] = idx; | |
3687 | cb->args[2] = ip_idx; | |
3688 | ||
3689 | return skb->len; | |
3690 | } | |
3691 | ||
3692 | static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
3693 | { | |
3694 | enum addr_type_t type = UNICAST_ADDR; | |
3695 | ||
3696 | return inet6_dump_addr(skb, cb, type); | |
3697 | } | |
3698 | ||
3699 | static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
3700 | { | |
3701 | enum addr_type_t type = MULTICAST_ADDR; | |
3702 | ||
3703 | return inet6_dump_addr(skb, cb, type); | |
3704 | } | |
3705 | ||
3706 | ||
3707 | static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
3708 | { | |
3709 | enum addr_type_t type = ANYCAST_ADDR; | |
3710 | ||
3711 | return inet6_dump_addr(skb, cb, type); | |
3712 | } | |
3713 | ||
3714 | static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, | |
3715 | void *arg) | |
3716 | { | |
3717 | struct net *net = sock_net(in_skb->sk); | |
3718 | struct ifaddrmsg *ifm; | |
3719 | struct nlattr *tb[IFA_MAX+1]; | |
3720 | struct in6_addr *addr = NULL; | |
3721 | struct net_device *dev = NULL; | |
3722 | struct inet6_ifaddr *ifa; | |
3723 | struct sk_buff *skb; | |
3724 | int err; | |
3725 | ||
3726 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); | |
3727 | if (err < 0) | |
3728 | goto errout; | |
3729 | ||
3730 | addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); | |
3731 | if (addr == NULL) { | |
3732 | err = -EINVAL; | |
3733 | goto errout; | |
3734 | } | |
3735 | ||
3736 | ifm = nlmsg_data(nlh); | |
3737 | if (ifm->ifa_index) | |
3738 | dev = __dev_get_by_index(net, ifm->ifa_index); | |
3739 | ||
3740 | ifa = ipv6_get_ifaddr(net, addr, dev, 1); | |
3741 | if (!ifa) { | |
3742 | err = -EADDRNOTAVAIL; | |
3743 | goto errout; | |
3744 | } | |
3745 | ||
3746 | skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); | |
3747 | if (!skb) { | |
3748 | err = -ENOBUFS; | |
3749 | goto errout_ifa; | |
3750 | } | |
3751 | ||
3752 | err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, | |
3753 | nlh->nlmsg_seq, RTM_NEWADDR, 0); | |
3754 | if (err < 0) { | |
3755 | /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ | |
3756 | WARN_ON(err == -EMSGSIZE); | |
3757 | kfree_skb(skb); | |
3758 | goto errout_ifa; | |
3759 | } | |
3760 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); | |
3761 | errout_ifa: | |
3762 | in6_ifa_put(ifa); | |
3763 | errout: | |
3764 | return err; | |
3765 | } | |
3766 | ||
3767 | static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) | |
3768 | { | |
3769 | struct sk_buff *skb; | |
3770 | struct net *net = dev_net(ifa->idev->dev); | |
3771 | int err = -ENOBUFS; | |
3772 | ||
3773 | skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); | |
3774 | if (skb == NULL) | |
3775 | goto errout; | |
3776 | ||
3777 | err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); | |
3778 | if (err < 0) { | |
3779 | /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ | |
3780 | WARN_ON(err == -EMSGSIZE); | |
3781 | kfree_skb(skb); | |
3782 | goto errout; | |
3783 | } | |
3784 | rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); | |
3785 | return; | |
3786 | errout: | |
3787 | if (err < 0) | |
3788 | rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); | |
3789 | } | |
3790 | ||
3791 | static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, | |
3792 | __s32 *array, int bytes) | |
3793 | { | |
3794 | BUG_ON(bytes < (DEVCONF_MAX * 4)); | |
3795 | ||
3796 | memset(array, 0, bytes); | |
3797 | array[DEVCONF_FORWARDING] = cnf->forwarding; | |
3798 | array[DEVCONF_HOPLIMIT] = cnf->hop_limit; | |
3799 | array[DEVCONF_MTU6] = cnf->mtu6; | |
3800 | array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; | |
3801 | array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; | |
3802 | array[DEVCONF_AUTOCONF] = cnf->autoconf; | |
3803 | array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; | |
3804 | array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; | |
3805 | array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; | |
3806 | array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; | |
3807 | array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; | |
3808 | #ifdef CONFIG_IPV6_PRIVACY | |
3809 | array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; | |
3810 | array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; | |
3811 | array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; | |
3812 | array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; | |
3813 | array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; | |
3814 | #endif | |
3815 | array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; | |
3816 | array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; | |
3817 | array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; | |
3818 | #ifdef CONFIG_IPV6_ROUTER_PREF | |
3819 | array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; | |
3820 | array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; | |
3821 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
3822 | array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; | |
3823 | #endif | |
3824 | #endif | |
3825 | array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; | |
3826 | array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; | |
3827 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
3828 | array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; | |
3829 | #endif | |
3830 | #ifdef CONFIG_IPV6_MROUTE | |
3831 | array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; | |
3832 | #endif | |
3833 | array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; | |
3834 | array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; | |
3835 | array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; | |
3836 | } | |
3837 | ||
3838 | static inline size_t inet6_if_nlmsg_size(void) | |
3839 | { | |
3840 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
3841 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
3842 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
3843 | + nla_total_size(4) /* IFLA_MTU */ | |
3844 | + nla_total_size(4) /* IFLA_LINK */ | |
3845 | + nla_total_size( /* IFLA_PROTINFO */ | |
3846 | nla_total_size(4) /* IFLA_INET6_FLAGS */ | |
3847 | + nla_total_size(sizeof(struct ifla_cacheinfo)) | |
3848 | + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ | |
3849 | + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ | |
3850 | + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ | |
3851 | ); | |
3852 | } | |
3853 | ||
3854 | static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib, | |
3855 | int items, int bytes) | |
3856 | { | |
3857 | int i; | |
3858 | int pad = bytes - sizeof(u64) * items; | |
3859 | BUG_ON(pad < 0); | |
3860 | ||
3861 | /* Use put_unaligned() because stats may not be aligned for u64. */ | |
3862 | put_unaligned(items, &stats[0]); | |
3863 | for (i = 1; i < items; i++) | |
3864 | put_unaligned(snmp_fold_field(mib, i), &stats[i]); | |
3865 | ||
3866 | memset(&stats[items], 0, pad); | |
3867 | } | |
3868 | ||
3869 | static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, | |
3870 | int items, int bytes, size_t syncpoff) | |
3871 | { | |
3872 | int i; | |
3873 | int pad = bytes - sizeof(u64) * items; | |
3874 | BUG_ON(pad < 0); | |
3875 | ||
3876 | /* Use put_unaligned() because stats may not be aligned for u64. */ | |
3877 | put_unaligned(items, &stats[0]); | |
3878 | for (i = 1; i < items; i++) | |
3879 | put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); | |
3880 | ||
3881 | memset(&stats[items], 0, pad); | |
3882 | } | |
3883 | ||
3884 | static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, | |
3885 | int bytes) | |
3886 | { | |
3887 | switch (attrtype) { | |
3888 | case IFLA_INET6_STATS: | |
3889 | __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, | |
3890 | IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); | |
3891 | break; | |
3892 | case IFLA_INET6_ICMP6STATS: | |
3893 | __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); | |
3894 | break; | |
3895 | } | |
3896 | } | |
3897 | ||
3898 | static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, | |
3899 | u32 pid, u32 seq, int event, unsigned int flags) | |
3900 | { | |
3901 | struct net_device *dev = idev->dev; | |
3902 | struct nlattr *nla; | |
3903 | struct ifinfomsg *hdr; | |
3904 | struct nlmsghdr *nlh; | |
3905 | void *protoinfo; | |
3906 | struct ifla_cacheinfo ci; | |
3907 | ||
3908 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); | |
3909 | if (nlh == NULL) | |
3910 | return -EMSGSIZE; | |
3911 | ||
3912 | hdr = nlmsg_data(nlh); | |
3913 | hdr->ifi_family = AF_INET6; | |
3914 | hdr->__ifi_pad = 0; | |
3915 | hdr->ifi_type = dev->type; | |
3916 | hdr->ifi_index = dev->ifindex; | |
3917 | hdr->ifi_flags = dev_get_flags(dev); | |
3918 | hdr->ifi_change = 0; | |
3919 | ||
3920 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); | |
3921 | ||
3922 | if (dev->addr_len) | |
3923 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); | |
3924 | ||
3925 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
3926 | if (dev->ifindex != dev->iflink) | |
3927 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); | |
3928 | ||
3929 | protoinfo = nla_nest_start(skb, IFLA_PROTINFO); | |
3930 | if (protoinfo == NULL) | |
3931 | goto nla_put_failure; | |
3932 | ||
3933 | NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); | |
3934 | ||
3935 | ci.max_reasm_len = IPV6_MAXPLEN; | |
3936 | ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 | |
3937 | + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); | |
3938 | ci.reachable_time = idev->nd_parms->reachable_time; | |
3939 | ci.retrans_time = idev->nd_parms->retrans_time; | |
3940 | NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); | |
3941 | ||
3942 | nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); | |
3943 | if (nla == NULL) | |
3944 | goto nla_put_failure; | |
3945 | ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); | |
3946 | ||
3947 | /* XXX - MC not implemented */ | |
3948 | ||
3949 | nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); | |
3950 | if (nla == NULL) | |
3951 | goto nla_put_failure; | |
3952 | snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); | |
3953 | ||
3954 | nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); | |
3955 | if (nla == NULL) | |
3956 | goto nla_put_failure; | |
3957 | snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); | |
3958 | ||
3959 | nla_nest_end(skb, protoinfo); | |
3960 | return nlmsg_end(skb, nlh); | |
3961 | ||
3962 | nla_put_failure: | |
3963 | nlmsg_cancel(skb, nlh); | |
3964 | return -EMSGSIZE; | |
3965 | } | |
3966 | ||
3967 | static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) | |
3968 | { | |
3969 | struct net *net = sock_net(skb->sk); | |
3970 | int h, s_h; | |
3971 | int idx = 0, s_idx; | |
3972 | struct net_device *dev; | |
3973 | struct inet6_dev *idev; | |
3974 | struct hlist_head *head; | |
3975 | struct hlist_node *node; | |
3976 | ||
3977 | s_h = cb->args[0]; | |
3978 | s_idx = cb->args[1]; | |
3979 | ||
3980 | rcu_read_lock(); | |
3981 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
3982 | idx = 0; | |
3983 | head = &net->dev_index_head[h]; | |
3984 | hlist_for_each_entry_rcu(dev, node, head, index_hlist) { | |
3985 | if (idx < s_idx) | |
3986 | goto cont; | |
3987 | idev = __in6_dev_get(dev); | |
3988 | if (!idev) | |
3989 | goto cont; | |
3990 | if (inet6_fill_ifinfo(skb, idev, | |
3991 | NETLINK_CB(cb->skb).pid, | |
3992 | cb->nlh->nlmsg_seq, | |
3993 | RTM_NEWLINK, NLM_F_MULTI) <= 0) | |
3994 | goto out; | |
3995 | cont: | |
3996 | idx++; | |
3997 | } | |
3998 | } | |
3999 | out: | |
4000 | rcu_read_unlock(); | |
4001 | cb->args[1] = idx; | |
4002 | cb->args[0] = h; | |
4003 | ||
4004 | return skb->len; | |
4005 | } | |
4006 | ||
4007 | void inet6_ifinfo_notify(int event, struct inet6_dev *idev) | |
4008 | { | |
4009 | struct sk_buff *skb; | |
4010 | struct net *net = dev_net(idev->dev); | |
4011 | int err = -ENOBUFS; | |
4012 | ||
4013 | skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); | |
4014 | if (skb == NULL) | |
4015 | goto errout; | |
4016 | ||
4017 | err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); | |
4018 | if (err < 0) { | |
4019 | /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ | |
4020 | WARN_ON(err == -EMSGSIZE); | |
4021 | kfree_skb(skb); | |
4022 | goto errout; | |
4023 | } | |
4024 | rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); | |
4025 | return; | |
4026 | errout: | |
4027 | if (err < 0) | |
4028 | rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); | |
4029 | } | |
4030 | ||
4031 | static inline size_t inet6_prefix_nlmsg_size(void) | |
4032 | { | |
4033 | return NLMSG_ALIGN(sizeof(struct prefixmsg)) | |
4034 | + nla_total_size(sizeof(struct in6_addr)) | |
4035 | + nla_total_size(sizeof(struct prefix_cacheinfo)); | |
4036 | } | |
4037 | ||
4038 | static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, | |
4039 | struct prefix_info *pinfo, u32 pid, u32 seq, | |
4040 | int event, unsigned int flags) | |
4041 | { | |
4042 | struct prefixmsg *pmsg; | |
4043 | struct nlmsghdr *nlh; | |
4044 | struct prefix_cacheinfo ci; | |
4045 | ||
4046 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); | |
4047 | if (nlh == NULL) | |
4048 | return -EMSGSIZE; | |
4049 | ||
4050 | pmsg = nlmsg_data(nlh); | |
4051 | pmsg->prefix_family = AF_INET6; | |
4052 | pmsg->prefix_pad1 = 0; | |
4053 | pmsg->prefix_pad2 = 0; | |
4054 | pmsg->prefix_ifindex = idev->dev->ifindex; | |
4055 | pmsg->prefix_len = pinfo->prefix_len; | |
4056 | pmsg->prefix_type = pinfo->type; | |
4057 | pmsg->prefix_pad3 = 0; | |
4058 | pmsg->prefix_flags = 0; | |
4059 | if (pinfo->onlink) | |
4060 | pmsg->prefix_flags |= IF_PREFIX_ONLINK; | |
4061 | if (pinfo->autoconf) | |
4062 | pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; | |
4063 | ||
4064 | NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); | |
4065 | ||
4066 | ci.preferred_time = ntohl(pinfo->prefered); | |
4067 | ci.valid_time = ntohl(pinfo->valid); | |
4068 | NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); | |
4069 | ||
4070 | return nlmsg_end(skb, nlh); | |
4071 | ||
4072 | nla_put_failure: | |
4073 | nlmsg_cancel(skb, nlh); | |
4074 | return -EMSGSIZE; | |
4075 | } | |
4076 | ||
4077 | static void inet6_prefix_notify(int event, struct inet6_dev *idev, | |
4078 | struct prefix_info *pinfo) | |
4079 | { | |
4080 | struct sk_buff *skb; | |
4081 | struct net *net = dev_net(idev->dev); | |
4082 | int err = -ENOBUFS; | |
4083 | ||
4084 | skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); | |
4085 | if (skb == NULL) | |
4086 | goto errout; | |
4087 | ||
4088 | err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); | |
4089 | if (err < 0) { | |
4090 | /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ | |
4091 | WARN_ON(err == -EMSGSIZE); | |
4092 | kfree_skb(skb); | |
4093 | goto errout; | |
4094 | } | |
4095 | rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); | |
4096 | return; | |
4097 | errout: | |
4098 | if (err < 0) | |
4099 | rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); | |
4100 | } | |
4101 | ||
4102 | static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) | |
4103 | { | |
4104 | inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); | |
4105 | ||
4106 | switch (event) { | |
4107 | case RTM_NEWADDR: | |
4108 | /* | |
4109 | * If the address was optimistic | |
4110 | * we inserted the route at the start of | |
4111 | * our DAD process, so we don't need | |
4112 | * to do it again | |
4113 | */ | |
4114 | if (!(ifp->rt->rt6i_node)) | |
4115 | ip6_ins_rt(ifp->rt); | |
4116 | if (ifp->idev->cnf.forwarding) | |
4117 | addrconf_join_anycast(ifp); | |
4118 | break; | |
4119 | case RTM_DELADDR: | |
4120 | if (ifp->idev->cnf.forwarding) | |
4121 | addrconf_leave_anycast(ifp); | |
4122 | addrconf_leave_solict(ifp->idev, &ifp->addr); | |
4123 | dst_hold(&ifp->rt->dst); | |
4124 | ||
4125 | if (ifp->state == INET6_IFADDR_STATE_DEAD && | |
4126 | ip6_del_rt(ifp->rt)) | |
4127 | dst_free(&ifp->rt->dst); | |
4128 | break; | |
4129 | } | |
4130 | } | |
4131 | ||
4132 | static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) | |
4133 | { | |
4134 | rcu_read_lock_bh(); | |
4135 | if (likely(ifp->idev->dead == 0)) | |
4136 | __ipv6_ifa_notify(event, ifp); | |
4137 | rcu_read_unlock_bh(); | |
4138 | } | |
4139 | ||
4140 | #ifdef CONFIG_SYSCTL | |
4141 | ||
4142 | static | |
4143 | int addrconf_sysctl_forward(ctl_table *ctl, int write, | |
4144 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
4145 | { | |
4146 | int *valp = ctl->data; | |
4147 | int val = *valp; | |
4148 | loff_t pos = *ppos; | |
4149 | int ret; | |
4150 | ||
4151 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
4152 | ||
4153 | if (write) | |
4154 | ret = addrconf_fixup_forwarding(ctl, valp, val); | |
4155 | if (ret) | |
4156 | *ppos = pos; | |
4157 | return ret; | |
4158 | } | |
4159 | ||
4160 | static void dev_disable_change(struct inet6_dev *idev) | |
4161 | { | |
4162 | if (!idev || !idev->dev) | |
4163 | return; | |
4164 | ||
4165 | if (idev->cnf.disable_ipv6) | |
4166 | addrconf_notify(NULL, NETDEV_DOWN, idev->dev); | |
4167 | else | |
4168 | addrconf_notify(NULL, NETDEV_UP, idev->dev); | |
4169 | } | |
4170 | ||
4171 | static void addrconf_disable_change(struct net *net, __s32 newf) | |
4172 | { | |
4173 | struct net_device *dev; | |
4174 | struct inet6_dev *idev; | |
4175 | ||
4176 | rcu_read_lock(); | |
4177 | for_each_netdev_rcu(net, dev) { | |
4178 | idev = __in6_dev_get(dev); | |
4179 | if (idev) { | |
4180 | int changed = (!idev->cnf.disable_ipv6) ^ (!newf); | |
4181 | idev->cnf.disable_ipv6 = newf; | |
4182 | if (changed) | |
4183 | dev_disable_change(idev); | |
4184 | } | |
4185 | } | |
4186 | rcu_read_unlock(); | |
4187 | } | |
4188 | ||
4189 | static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) | |
4190 | { | |
4191 | struct net *net; | |
4192 | ||
4193 | net = (struct net *)table->extra2; | |
4194 | ||
4195 | if (p == &net->ipv6.devconf_dflt->disable_ipv6) | |
4196 | return 0; | |
4197 | ||
4198 | if (!rtnl_trylock()) { | |
4199 | /* Restore the original values before restarting */ | |
4200 | *p = old; | |
4201 | return restart_syscall(); | |
4202 | } | |
4203 | ||
4204 | if (p == &net->ipv6.devconf_all->disable_ipv6) { | |
4205 | __s32 newf = net->ipv6.devconf_all->disable_ipv6; | |
4206 | net->ipv6.devconf_dflt->disable_ipv6 = newf; | |
4207 | addrconf_disable_change(net, newf); | |
4208 | } else if ((!*p) ^ (!old)) | |
4209 | dev_disable_change((struct inet6_dev *)table->extra1); | |
4210 | ||
4211 | rtnl_unlock(); | |
4212 | return 0; | |
4213 | } | |
4214 | ||
4215 | static | |
4216 | int addrconf_sysctl_disable(ctl_table *ctl, int write, | |
4217 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
4218 | { | |
4219 | int *valp = ctl->data; | |
4220 | int val = *valp; | |
4221 | loff_t pos = *ppos; | |
4222 | int ret; | |
4223 | ||
4224 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
4225 | ||
4226 | if (write) | |
4227 | ret = addrconf_disable_ipv6(ctl, valp, val); | |
4228 | if (ret) | |
4229 | *ppos = pos; | |
4230 | return ret; | |
4231 | } | |
4232 | ||
4233 | static struct addrconf_sysctl_table | |
4234 | { | |
4235 | struct ctl_table_header *sysctl_header; | |
4236 | ctl_table addrconf_vars[DEVCONF_MAX+1]; | |
4237 | char *dev_name; | |
4238 | } addrconf_sysctl __read_mostly = { | |
4239 | .sysctl_header = NULL, | |
4240 | .addrconf_vars = { | |
4241 | { | |
4242 | .procname = "forwarding", | |
4243 | .data = &ipv6_devconf.forwarding, | |
4244 | .maxlen = sizeof(int), | |
4245 | .mode = 0644, | |
4246 | .proc_handler = addrconf_sysctl_forward, | |
4247 | }, | |
4248 | { | |
4249 | .procname = "hop_limit", | |
4250 | .data = &ipv6_devconf.hop_limit, | |
4251 | .maxlen = sizeof(int), | |
4252 | .mode = 0644, | |
4253 | .proc_handler = proc_dointvec, | |
4254 | }, | |
4255 | { | |
4256 | .procname = "mtu", | |
4257 | .data = &ipv6_devconf.mtu6, | |
4258 | .maxlen = sizeof(int), | |
4259 | .mode = 0644, | |
4260 | .proc_handler = proc_dointvec, | |
4261 | }, | |
4262 | { | |
4263 | .procname = "accept_ra", | |
4264 | .data = &ipv6_devconf.accept_ra, | |
4265 | .maxlen = sizeof(int), | |
4266 | .mode = 0644, | |
4267 | .proc_handler = proc_dointvec, | |
4268 | }, | |
4269 | { | |
4270 | .procname = "accept_redirects", | |
4271 | .data = &ipv6_devconf.accept_redirects, | |
4272 | .maxlen = sizeof(int), | |
4273 | .mode = 0644, | |
4274 | .proc_handler = proc_dointvec, | |
4275 | }, | |
4276 | { | |
4277 | .procname = "autoconf", | |
4278 | .data = &ipv6_devconf.autoconf, | |
4279 | .maxlen = sizeof(int), | |
4280 | .mode = 0644, | |
4281 | .proc_handler = proc_dointvec, | |
4282 | }, | |
4283 | { | |
4284 | .procname = "dad_transmits", | |
4285 | .data = &ipv6_devconf.dad_transmits, | |
4286 | .maxlen = sizeof(int), | |
4287 | .mode = 0644, | |
4288 | .proc_handler = proc_dointvec, | |
4289 | }, | |
4290 | { | |
4291 | .procname = "router_solicitations", | |
4292 | .data = &ipv6_devconf.rtr_solicits, | |
4293 | .maxlen = sizeof(int), | |
4294 | .mode = 0644, | |
4295 | .proc_handler = proc_dointvec, | |
4296 | }, | |
4297 | { | |
4298 | .procname = "router_solicitation_interval", | |
4299 | .data = &ipv6_devconf.rtr_solicit_interval, | |
4300 | .maxlen = sizeof(int), | |
4301 | .mode = 0644, | |
4302 | .proc_handler = proc_dointvec_jiffies, | |
4303 | }, | |
4304 | { | |
4305 | .procname = "router_solicitation_delay", | |
4306 | .data = &ipv6_devconf.rtr_solicit_delay, | |
4307 | .maxlen = sizeof(int), | |
4308 | .mode = 0644, | |
4309 | .proc_handler = proc_dointvec_jiffies, | |
4310 | }, | |
4311 | { | |
4312 | .procname = "force_mld_version", | |
4313 | .data = &ipv6_devconf.force_mld_version, | |
4314 | .maxlen = sizeof(int), | |
4315 | .mode = 0644, | |
4316 | .proc_handler = proc_dointvec, | |
4317 | }, | |
4318 | #ifdef CONFIG_IPV6_PRIVACY | |
4319 | { | |
4320 | .procname = "use_tempaddr", | |
4321 | .data = &ipv6_devconf.use_tempaddr, | |
4322 | .maxlen = sizeof(int), | |
4323 | .mode = 0644, | |
4324 | .proc_handler = proc_dointvec, | |
4325 | }, | |
4326 | { | |
4327 | .procname = "temp_valid_lft", | |
4328 | .data = &ipv6_devconf.temp_valid_lft, | |
4329 | .maxlen = sizeof(int), | |
4330 | .mode = 0644, | |
4331 | .proc_handler = proc_dointvec, | |
4332 | }, | |
4333 | { | |
4334 | .procname = "temp_prefered_lft", | |
4335 | .data = &ipv6_devconf.temp_prefered_lft, | |
4336 | .maxlen = sizeof(int), | |
4337 | .mode = 0644, | |
4338 | .proc_handler = proc_dointvec, | |
4339 | }, | |
4340 | { | |
4341 | .procname = "regen_max_retry", | |
4342 | .data = &ipv6_devconf.regen_max_retry, | |
4343 | .maxlen = sizeof(int), | |
4344 | .mode = 0644, | |
4345 | .proc_handler = proc_dointvec, | |
4346 | }, | |
4347 | { | |
4348 | .procname = "max_desync_factor", | |
4349 | .data = &ipv6_devconf.max_desync_factor, | |
4350 | .maxlen = sizeof(int), | |
4351 | .mode = 0644, | |
4352 | .proc_handler = proc_dointvec, | |
4353 | }, | |
4354 | #endif | |
4355 | { | |
4356 | .procname = "max_addresses", | |
4357 | .data = &ipv6_devconf.max_addresses, | |
4358 | .maxlen = sizeof(int), | |
4359 | .mode = 0644, | |
4360 | .proc_handler = proc_dointvec, | |
4361 | }, | |
4362 | { | |
4363 | .procname = "accept_ra_defrtr", | |
4364 | .data = &ipv6_devconf.accept_ra_defrtr, | |
4365 | .maxlen = sizeof(int), | |
4366 | .mode = 0644, | |
4367 | .proc_handler = proc_dointvec, | |
4368 | }, | |
4369 | { | |
4370 | .procname = "accept_ra_pinfo", | |
4371 | .data = &ipv6_devconf.accept_ra_pinfo, | |
4372 | .maxlen = sizeof(int), | |
4373 | .mode = 0644, | |
4374 | .proc_handler = proc_dointvec, | |
4375 | }, | |
4376 | #ifdef CONFIG_IPV6_ROUTER_PREF | |
4377 | { | |
4378 | .procname = "accept_ra_rtr_pref", | |
4379 | .data = &ipv6_devconf.accept_ra_rtr_pref, | |
4380 | .maxlen = sizeof(int), | |
4381 | .mode = 0644, | |
4382 | .proc_handler = proc_dointvec, | |
4383 | }, | |
4384 | { | |
4385 | .procname = "router_probe_interval", | |
4386 | .data = &ipv6_devconf.rtr_probe_interval, | |
4387 | .maxlen = sizeof(int), | |
4388 | .mode = 0644, | |
4389 | .proc_handler = proc_dointvec_jiffies, | |
4390 | }, | |
4391 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
4392 | { | |
4393 | .procname = "accept_ra_rt_info_max_plen", | |
4394 | .data = &ipv6_devconf.accept_ra_rt_info_max_plen, | |
4395 | .maxlen = sizeof(int), | |
4396 | .mode = 0644, | |
4397 | .proc_handler = proc_dointvec, | |
4398 | }, | |
4399 | #endif | |
4400 | #endif | |
4401 | { | |
4402 | .procname = "proxy_ndp", | |
4403 | .data = &ipv6_devconf.proxy_ndp, | |
4404 | .maxlen = sizeof(int), | |
4405 | .mode = 0644, | |
4406 | .proc_handler = proc_dointvec, | |
4407 | }, | |
4408 | { | |
4409 | .procname = "accept_source_route", | |
4410 | .data = &ipv6_devconf.accept_source_route, | |
4411 | .maxlen = sizeof(int), | |
4412 | .mode = 0644, | |
4413 | .proc_handler = proc_dointvec, | |
4414 | }, | |
4415 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
4416 | { | |
4417 | .procname = "optimistic_dad", | |
4418 | .data = &ipv6_devconf.optimistic_dad, | |
4419 | .maxlen = sizeof(int), | |
4420 | .mode = 0644, | |
4421 | .proc_handler = proc_dointvec, | |
4422 | ||
4423 | }, | |
4424 | #endif | |
4425 | #ifdef CONFIG_IPV6_MROUTE | |
4426 | { | |
4427 | .procname = "mc_forwarding", | |
4428 | .data = &ipv6_devconf.mc_forwarding, | |
4429 | .maxlen = sizeof(int), | |
4430 | .mode = 0444, | |
4431 | .proc_handler = proc_dointvec, | |
4432 | }, | |
4433 | #endif | |
4434 | { | |
4435 | .procname = "disable_ipv6", | |
4436 | .data = &ipv6_devconf.disable_ipv6, | |
4437 | .maxlen = sizeof(int), | |
4438 | .mode = 0644, | |
4439 | .proc_handler = addrconf_sysctl_disable, | |
4440 | }, | |
4441 | { | |
4442 | .procname = "accept_dad", | |
4443 | .data = &ipv6_devconf.accept_dad, | |
4444 | .maxlen = sizeof(int), | |
4445 | .mode = 0644, | |
4446 | .proc_handler = proc_dointvec, | |
4447 | }, | |
4448 | { | |
4449 | .procname = "force_tllao", | |
4450 | .data = &ipv6_devconf.force_tllao, | |
4451 | .maxlen = sizeof(int), | |
4452 | .mode = 0644, | |
4453 | .proc_handler = proc_dointvec | |
4454 | }, | |
4455 | { | |
4456 | /* sentinel */ | |
4457 | } | |
4458 | }, | |
4459 | }; | |
4460 | ||
4461 | static int __addrconf_sysctl_register(struct net *net, char *dev_name, | |
4462 | struct inet6_dev *idev, struct ipv6_devconf *p) | |
4463 | { | |
4464 | int i; | |
4465 | struct addrconf_sysctl_table *t; | |
4466 | ||
4467 | #define ADDRCONF_CTL_PATH_DEV 3 | |
4468 | ||
4469 | struct ctl_path addrconf_ctl_path[] = { | |
4470 | { .procname = "net", }, | |
4471 | { .procname = "ipv6", }, | |
4472 | { .procname = "conf", }, | |
4473 | { /* to be set */ }, | |
4474 | { }, | |
4475 | }; | |
4476 | ||
4477 | ||
4478 | t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); | |
4479 | if (t == NULL) | |
4480 | goto out; | |
4481 | ||
4482 | for (i = 0; t->addrconf_vars[i].data; i++) { | |
4483 | t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; | |
4484 | t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ | |
4485 | t->addrconf_vars[i].extra2 = net; | |
4486 | } | |
4487 | ||
4488 | /* | |
4489 | * Make a copy of dev_name, because '.procname' is regarded as const | |
4490 | * by sysctl and we wouldn't want anyone to change it under our feet | |
4491 | * (see SIOCSIFNAME). | |
4492 | */ | |
4493 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); | |
4494 | if (!t->dev_name) | |
4495 | goto free; | |
4496 | ||
4497 | addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; | |
4498 | ||
4499 | t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, | |
4500 | t->addrconf_vars); | |
4501 | if (t->sysctl_header == NULL) | |
4502 | goto free_procname; | |
4503 | ||
4504 | p->sysctl = t; | |
4505 | return 0; | |
4506 | ||
4507 | free_procname: | |
4508 | kfree(t->dev_name); | |
4509 | free: | |
4510 | kfree(t); | |
4511 | out: | |
4512 | return -ENOBUFS; | |
4513 | } | |
4514 | ||
4515 | static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) | |
4516 | { | |
4517 | struct addrconf_sysctl_table *t; | |
4518 | ||
4519 | if (p->sysctl == NULL) | |
4520 | return; | |
4521 | ||
4522 | t = p->sysctl; | |
4523 | p->sysctl = NULL; | |
4524 | unregister_sysctl_table(t->sysctl_header); | |
4525 | kfree(t->dev_name); | |
4526 | kfree(t); | |
4527 | } | |
4528 | ||
4529 | static void addrconf_sysctl_register(struct inet6_dev *idev) | |
4530 | { | |
4531 | neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", | |
4532 | &ndisc_ifinfo_sysctl_change); | |
4533 | __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, | |
4534 | idev, &idev->cnf); | |
4535 | } | |
4536 | ||
4537 | static void addrconf_sysctl_unregister(struct inet6_dev *idev) | |
4538 | { | |
4539 | __addrconf_sysctl_unregister(&idev->cnf); | |
4540 | neigh_sysctl_unregister(idev->nd_parms); | |
4541 | } | |
4542 | ||
4543 | ||
4544 | #endif | |
4545 | ||
4546 | static int __net_init addrconf_init_net(struct net *net) | |
4547 | { | |
4548 | int err; | |
4549 | struct ipv6_devconf *all, *dflt; | |
4550 | ||
4551 | err = -ENOMEM; | |
4552 | all = &ipv6_devconf; | |
4553 | dflt = &ipv6_devconf_dflt; | |
4554 | ||
4555 | if (!net_eq(net, &init_net)) { | |
4556 | all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); | |
4557 | if (all == NULL) | |
4558 | goto err_alloc_all; | |
4559 | ||
4560 | dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); | |
4561 | if (dflt == NULL) | |
4562 | goto err_alloc_dflt; | |
4563 | } else { | |
4564 | /* these will be inherited by all namespaces */ | |
4565 | dflt->autoconf = ipv6_defaults.autoconf; | |
4566 | dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; | |
4567 | } | |
4568 | ||
4569 | net->ipv6.devconf_all = all; | |
4570 | net->ipv6.devconf_dflt = dflt; | |
4571 | ||
4572 | #ifdef CONFIG_SYSCTL | |
4573 | err = __addrconf_sysctl_register(net, "all", NULL, all); | |
4574 | if (err < 0) | |
4575 | goto err_reg_all; | |
4576 | ||
4577 | err = __addrconf_sysctl_register(net, "default", NULL, dflt); | |
4578 | if (err < 0) | |
4579 | goto err_reg_dflt; | |
4580 | #endif | |
4581 | return 0; | |
4582 | ||
4583 | #ifdef CONFIG_SYSCTL | |
4584 | err_reg_dflt: | |
4585 | __addrconf_sysctl_unregister(all); | |
4586 | err_reg_all: | |
4587 | kfree(dflt); | |
4588 | #endif | |
4589 | err_alloc_dflt: | |
4590 | kfree(all); | |
4591 | err_alloc_all: | |
4592 | return err; | |
4593 | } | |
4594 | ||
4595 | static void __net_exit addrconf_exit_net(struct net *net) | |
4596 | { | |
4597 | #ifdef CONFIG_SYSCTL | |
4598 | __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); | |
4599 | __addrconf_sysctl_unregister(net->ipv6.devconf_all); | |
4600 | #endif | |
4601 | if (!net_eq(net, &init_net)) { | |
4602 | kfree(net->ipv6.devconf_dflt); | |
4603 | kfree(net->ipv6.devconf_all); | |
4604 | } | |
4605 | } | |
4606 | ||
4607 | static struct pernet_operations addrconf_ops = { | |
4608 | .init = addrconf_init_net, | |
4609 | .exit = addrconf_exit_net, | |
4610 | }; | |
4611 | ||
4612 | /* | |
4613 | * Device notifier | |
4614 | */ | |
4615 | ||
4616 | int register_inet6addr_notifier(struct notifier_block *nb) | |
4617 | { | |
4618 | return atomic_notifier_chain_register(&inet6addr_chain, nb); | |
4619 | } | |
4620 | EXPORT_SYMBOL(register_inet6addr_notifier); | |
4621 | ||
4622 | int unregister_inet6addr_notifier(struct notifier_block *nb) | |
4623 | { | |
4624 | return atomic_notifier_chain_unregister(&inet6addr_chain, nb); | |
4625 | } | |
4626 | EXPORT_SYMBOL(unregister_inet6addr_notifier); | |
4627 | ||
4628 | /* | |
4629 | * Init / cleanup code | |
4630 | */ | |
4631 | ||
4632 | int __init addrconf_init(void) | |
4633 | { | |
4634 | int i, err; | |
4635 | ||
4636 | err = ipv6_addr_label_init(); | |
4637 | if (err < 0) { | |
4638 | printk(KERN_CRIT "IPv6 Addrconf:" | |
4639 | " cannot initialize default policy table: %d.\n", err); | |
4640 | return err; | |
4641 | } | |
4642 | ||
4643 | register_pernet_subsys(&addrconf_ops); | |
4644 | ||
4645 | /* The addrconf netdev notifier requires that loopback_dev | |
4646 | * has it's ipv6 private information allocated and setup | |
4647 | * before it can bring up and give link-local addresses | |
4648 | * to other devices which are up. | |
4649 | * | |
4650 | * Unfortunately, loopback_dev is not necessarily the first | |
4651 | * entry in the global dev_base list of net devices. In fact, | |
4652 | * it is likely to be the very last entry on that list. | |
4653 | * So this causes the notifier registry below to try and | |
4654 | * give link-local addresses to all devices besides loopback_dev | |
4655 | * first, then loopback_dev, which cases all the non-loopback_dev | |
4656 | * devices to fail to get a link-local address. | |
4657 | * | |
4658 | * So, as a temporary fix, allocate the ipv6 structure for | |
4659 | * loopback_dev first by hand. | |
4660 | * Longer term, all of the dependencies ipv6 has upon the loopback | |
4661 | * device and it being up should be removed. | |
4662 | */ | |
4663 | rtnl_lock(); | |
4664 | if (!ipv6_add_dev(init_net.loopback_dev)) | |
4665 | err = -ENOMEM; | |
4666 | rtnl_unlock(); | |
4667 | if (err) | |
4668 | goto errlo; | |
4669 | ||
4670 | for (i = 0; i < IN6_ADDR_HSIZE; i++) | |
4671 | INIT_HLIST_HEAD(&inet6_addr_lst[i]); | |
4672 | ||
4673 | register_netdevice_notifier(&ipv6_dev_notf); | |
4674 | ||
4675 | addrconf_verify(0); | |
4676 | ||
4677 | err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); | |
4678 | if (err < 0) | |
4679 | goto errout; | |
4680 | ||
4681 | /* Only the first call to __rtnl_register can fail */ | |
4682 | __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); | |
4683 | __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); | |
4684 | __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); | |
4685 | __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); | |
4686 | __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); | |
4687 | ||
4688 | ipv6_addr_label_rtnl_register(); | |
4689 | ||
4690 | return 0; | |
4691 | errout: | |
4692 | unregister_netdevice_notifier(&ipv6_dev_notf); | |
4693 | errlo: | |
4694 | unregister_pernet_subsys(&addrconf_ops); | |
4695 | ||
4696 | return err; | |
4697 | } | |
4698 | ||
4699 | void addrconf_cleanup(void) | |
4700 | { | |
4701 | struct net_device *dev; | |
4702 | int i; | |
4703 | ||
4704 | unregister_netdevice_notifier(&ipv6_dev_notf); | |
4705 | unregister_pernet_subsys(&addrconf_ops); | |
4706 | ||
4707 | rtnl_lock(); | |
4708 | ||
4709 | /* clean dev list */ | |
4710 | for_each_netdev(&init_net, dev) { | |
4711 | if (__in6_dev_get(dev) == NULL) | |
4712 | continue; | |
4713 | addrconf_ifdown(dev, 1); | |
4714 | } | |
4715 | addrconf_ifdown(init_net.loopback_dev, 2); | |
4716 | ||
4717 | /* | |
4718 | * Check hash table. | |
4719 | */ | |
4720 | spin_lock_bh(&addrconf_hash_lock); | |
4721 | for (i = 0; i < IN6_ADDR_HSIZE; i++) | |
4722 | WARN_ON(!hlist_empty(&inet6_addr_lst[i])); | |
4723 | spin_unlock_bh(&addrconf_hash_lock); | |
4724 | ||
4725 | del_timer(&addr_chk_timer); | |
4726 | rtnl_unlock(); | |
4727 | } |