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TOMOYO Linux Cross Reference
Linux/net/ipv6/addrconf.c

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.6 ] ~ [ linux-5.4.22 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.106 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.171 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.214 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.214 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #define pr_fmt(fmt) "IPv6: " fmt
 42 
 43 #include <linux/errno.h>
 44 #include <linux/types.h>
 45 #include <linux/kernel.h>
 46 #include <linux/socket.h>
 47 #include <linux/sockios.h>
 48 #include <linux/net.h>
 49 #include <linux/in6.h>
 50 #include <linux/netdevice.h>
 51 #include <linux/if_addr.h>
 52 #include <linux/if_arp.h>
 53 #include <linux/if_arcnet.h>
 54 #include <linux/if_infiniband.h>
 55 #include <linux/route.h>
 56 #include <linux/inetdevice.h>
 57 #include <linux/init.h>
 58 #include <linux/slab.h>
 59 #ifdef CONFIG_SYSCTL
 60 #include <linux/sysctl.h>
 61 #endif
 62 #include <linux/capability.h>
 63 #include <linux/delay.h>
 64 #include <linux/notifier.h>
 65 #include <linux/string.h>
 66 #include <linux/hash.h>
 67 
 68 #include <net/net_namespace.h>
 69 #include <net/sock.h>
 70 #include <net/snmp.h>
 71 
 72 #include <net/af_ieee802154.h>
 73 #include <net/firewire.h>
 74 #include <net/ipv6.h>
 75 #include <net/protocol.h>
 76 #include <net/ndisc.h>
 77 #include <net/ip6_route.h>
 78 #include <net/addrconf.h>
 79 #include <net/tcp.h>
 80 #include <net/ip.h>
 81 #include <net/netlink.h>
 82 #include <net/pkt_sched.h>
 83 #include <linux/if_tunnel.h>
 84 #include <linux/rtnetlink.h>
 85 #include <linux/netconf.h>
 86 
 87 #ifdef CONFIG_IPV6_PRIVACY
 88 #include <linux/random.h>
 89 #endif
 90 
 91 #include <linux/uaccess.h>
 92 #include <asm/unaligned.h>
 93 
 94 #include <linux/proc_fs.h>
 95 #include <linux/seq_file.h>
 96 #include <linux/export.h>
 97 
 98 /* Set to 3 to get tracing... */
 99 #define ACONF_DEBUG 2
100 
101 #if ACONF_DEBUG >= 3
102 #define ADBG(x) printk x
103 #else
104 #define ADBG(x)
105 #endif
106 
107 #define INFINITY_LIFE_TIME      0xFFFFFFFF
108 
109 static inline u32 cstamp_delta(unsigned long cstamp)
110 {
111         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112 }
113 
114 #ifdef CONFIG_SYSCTL
115 static void addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117 #else
118 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119 {
120 }
121 
122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123 {
124 }
125 #endif
126 
127 #ifdef CONFIG_IPV6_PRIVACY
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
131 #endif
132 
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135 
136 /*
137  *      Configured unicast address hash table
138  */
139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
140 static DEFINE_SPINLOCK(addrconf_hash_lock);
141 
142 static void addrconf_verify(unsigned long);
143 
144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
145 static DEFINE_SPINLOCK(addrconf_verify_lock);
146 
147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
149 
150 static void addrconf_type_change(struct net_device *dev,
151                                  unsigned long event);
152 static int addrconf_ifdown(struct net_device *dev, int how);
153 
154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
155                                                   int plen,
156                                                   const struct net_device *dev,
157                                                   u32 flags, u32 noflags);
158 
159 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_timer(unsigned long data);
161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
162 static void addrconf_dad_run(struct inet6_dev *idev);
163 static void addrconf_rs_timer(unsigned long data);
164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
166 
167 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
168                                 struct prefix_info *pinfo);
169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170                                struct net_device *dev);
171 
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
173         .forwarding             = 0,
174         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
175         .mtu6                   = IPV6_MIN_MTU,
176         .accept_ra              = 1,
177         .accept_redirects       = 1,
178         .autoconf               = 1,
179         .force_mld_version      = 0,
180         .dad_transmits          = 1,
181         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
182         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
183         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
184 #ifdef CONFIG_IPV6_PRIVACY
185         .use_tempaddr           = 0,
186         .temp_valid_lft         = TEMP_VALID_LIFETIME,
187         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
188         .regen_max_retry        = REGEN_MAX_RETRY,
189         .max_desync_factor      = MAX_DESYNC_FACTOR,
190 #endif
191         .max_addresses          = IPV6_MAX_ADDRESSES,
192         .accept_ra_defrtr       = 1,
193         .accept_ra_pinfo        = 1,
194 #ifdef CONFIG_IPV6_ROUTER_PREF
195         .accept_ra_rtr_pref     = 1,
196         .rtr_probe_interval     = 60 * HZ,
197 #ifdef CONFIG_IPV6_ROUTE_INFO
198         .accept_ra_rt_info_max_plen = 0,
199 #endif
200 #endif
201         .proxy_ndp              = 0,
202         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
203         .disable_ipv6           = 0,
204         .accept_dad             = 1,
205 };
206 
207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
208         .forwarding             = 0,
209         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
210         .mtu6                   = IPV6_MIN_MTU,
211         .accept_ra              = 1,
212         .accept_redirects       = 1,
213         .autoconf               = 1,
214         .dad_transmits          = 1,
215         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
216         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
217         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
218 #ifdef CONFIG_IPV6_PRIVACY
219         .use_tempaddr           = 0,
220         .temp_valid_lft         = TEMP_VALID_LIFETIME,
221         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
222         .regen_max_retry        = REGEN_MAX_RETRY,
223         .max_desync_factor      = MAX_DESYNC_FACTOR,
224 #endif
225         .max_addresses          = IPV6_MAX_ADDRESSES,
226         .accept_ra_defrtr       = 1,
227         .accept_ra_pinfo        = 1,
228 #ifdef CONFIG_IPV6_ROUTER_PREF
229         .accept_ra_rtr_pref     = 1,
230         .rtr_probe_interval     = 60 * HZ,
231 #ifdef CONFIG_IPV6_ROUTE_INFO
232         .accept_ra_rt_info_max_plen = 0,
233 #endif
234 #endif
235         .proxy_ndp              = 0,
236         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
237         .disable_ipv6           = 0,
238         .accept_dad             = 1,
239 };
240 
241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
246 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
247 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
248 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
249 
250 /* Check if a valid qdisc is available */
251 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
252 {
253         return !qdisc_tx_is_noop(dev);
254 }
255 
256 static void addrconf_del_rs_timer(struct inet6_dev *idev)
257 {
258         if (del_timer(&idev->rs_timer))
259                 __in6_dev_put(idev);
260 }
261 
262 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
263 {
264         if (del_timer(&ifp->dad_timer))
265                 __in6_ifa_put(ifp);
266 }
267 
268 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
269                                   unsigned long when)
270 {
271         if (!timer_pending(&idev->rs_timer))
272                 in6_dev_hold(idev);
273         mod_timer(&idev->rs_timer, jiffies + when);
274 }
275 
276 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
277                                    unsigned long when)
278 {
279         if (!timer_pending(&ifp->dad_timer))
280                 in6_ifa_hold(ifp);
281         mod_timer(&ifp->dad_timer, jiffies + when);
282 }
283 
284 static int snmp6_alloc_dev(struct inet6_dev *idev)
285 {
286         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
287                           sizeof(struct ipstats_mib),
288                           __alignof__(struct ipstats_mib)) < 0)
289                 goto err_ip;
290         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
291                                         GFP_KERNEL);
292         if (!idev->stats.icmpv6dev)
293                 goto err_icmp;
294         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
295                                            GFP_KERNEL);
296         if (!idev->stats.icmpv6msgdev)
297                 goto err_icmpmsg;
298 
299         return 0;
300 
301 err_icmpmsg:
302         kfree(idev->stats.icmpv6dev);
303 err_icmp:
304         snmp_mib_free((void __percpu **)idev->stats.ipv6);
305 err_ip:
306         return -ENOMEM;
307 }
308 
309 static void snmp6_free_dev(struct inet6_dev *idev)
310 {
311         kfree(idev->stats.icmpv6msgdev);
312         kfree(idev->stats.icmpv6dev);
313         snmp_mib_free((void __percpu **)idev->stats.ipv6);
314 }
315 
316 /* Nobody refers to this device, we may destroy it. */
317 
318 void in6_dev_finish_destroy(struct inet6_dev *idev)
319 {
320         struct net_device *dev = idev->dev;
321 
322         WARN_ON(!list_empty(&idev->addr_list));
323         WARN_ON(idev->mc_list != NULL);
324         WARN_ON(timer_pending(&idev->rs_timer));
325 
326 #ifdef NET_REFCNT_DEBUG
327         pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
328 #endif
329         dev_put(dev);
330         if (!idev->dead) {
331                 pr_warn("Freeing alive inet6 device %p\n", idev);
332                 return;
333         }
334         snmp6_free_dev(idev);
335         kfree_rcu(idev, rcu);
336 }
337 EXPORT_SYMBOL(in6_dev_finish_destroy);
338 
339 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
340 {
341         struct inet6_dev *ndev;
342 
343         ASSERT_RTNL();
344 
345         if (dev->mtu < IPV6_MIN_MTU)
346                 return NULL;
347 
348         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
349 
350         if (ndev == NULL)
351                 return NULL;
352 
353         rwlock_init(&ndev->lock);
354         ndev->dev = dev;
355         INIT_LIST_HEAD(&ndev->addr_list);
356         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
357                     (unsigned long)ndev);
358         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
359         ndev->cnf.mtu6 = dev->mtu;
360         ndev->cnf.sysctl = NULL;
361         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
362         if (ndev->nd_parms == NULL) {
363                 kfree(ndev);
364                 return NULL;
365         }
366         if (ndev->cnf.forwarding)
367                 dev_disable_lro(dev);
368         /* We refer to the device */
369         dev_hold(dev);
370 
371         if (snmp6_alloc_dev(ndev) < 0) {
372                 ADBG((KERN_WARNING
373                         "%s: cannot allocate memory for statistics; dev=%s.\n",
374                         __func__, dev->name));
375                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
376                 dev_put(dev);
377                 kfree(ndev);
378                 return NULL;
379         }
380 
381         if (snmp6_register_dev(ndev) < 0) {
382                 ADBG((KERN_WARNING
383                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
384                         __func__, dev->name));
385                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
386                 ndev->dead = 1;
387                 in6_dev_finish_destroy(ndev);
388                 return NULL;
389         }
390 
391         /* One reference from device.  We must do this before
392          * we invoke __ipv6_regen_rndid().
393          */
394         in6_dev_hold(ndev);
395 
396         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
397                 ndev->cnf.accept_dad = -1;
398 
399 #if IS_ENABLED(CONFIG_IPV6_SIT)
400         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
401                 pr_info("%s: Disabled Multicast RS\n", dev->name);
402                 ndev->cnf.rtr_solicits = 0;
403         }
404 #endif
405 
406 #ifdef CONFIG_IPV6_PRIVACY
407         INIT_LIST_HEAD(&ndev->tempaddr_list);
408         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
409         if ((dev->flags&IFF_LOOPBACK) ||
410             dev->type == ARPHRD_TUNNEL ||
411             dev->type == ARPHRD_TUNNEL6 ||
412             dev->type == ARPHRD_SIT ||
413             dev->type == ARPHRD_NONE) {
414                 ndev->cnf.use_tempaddr = -1;
415         } else {
416                 in6_dev_hold(ndev);
417                 ipv6_regen_rndid((unsigned long) ndev);
418         }
419 #endif
420         ndev->token = in6addr_any;
421 
422         if (netif_running(dev) && addrconf_qdisc_ok(dev))
423                 ndev->if_flags |= IF_READY;
424 
425         ipv6_mc_init_dev(ndev);
426         ndev->tstamp = jiffies;
427         addrconf_sysctl_register(ndev);
428         /* protected by rtnl_lock */
429         rcu_assign_pointer(dev->ip6_ptr, ndev);
430 
431         /* Join interface-local all-node multicast group */
432         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
433 
434         /* Join all-node multicast group */
435         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
436 
437         /* Join all-router multicast group if forwarding is set */
438         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
439                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
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 static int inet6_netconf_msgsize_devconf(int type)
463 {
464         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
465                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
466 
467         /* type -1 is used for ALL */
468         if (type == -1 || type == NETCONFA_FORWARDING)
469                 size += nla_total_size(4);
470 #ifdef CONFIG_IPV6_MROUTE
471         if (type == -1 || type == NETCONFA_MC_FORWARDING)
472                 size += nla_total_size(4);
473 #endif
474 
475         return size;
476 }
477 
478 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
479                                       struct ipv6_devconf *devconf, u32 portid,
480                                       u32 seq, int event, unsigned int flags,
481                                       int type)
482 {
483         struct nlmsghdr  *nlh;
484         struct netconfmsg *ncm;
485 
486         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
487                         flags);
488         if (nlh == NULL)
489                 return -EMSGSIZE;
490 
491         ncm = nlmsg_data(nlh);
492         ncm->ncm_family = AF_INET6;
493 
494         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
495                 goto nla_put_failure;
496 
497         /* type -1 is used for ALL */
498         if ((type == -1 || type == NETCONFA_FORWARDING) &&
499             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
500                 goto nla_put_failure;
501 #ifdef CONFIG_IPV6_MROUTE
502         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
503             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
504                         devconf->mc_forwarding) < 0)
505                 goto nla_put_failure;
506 #endif
507         return nlmsg_end(skb, nlh);
508 
509 nla_put_failure:
510         nlmsg_cancel(skb, nlh);
511         return -EMSGSIZE;
512 }
513 
514 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
515                                   struct ipv6_devconf *devconf)
516 {
517         struct sk_buff *skb;
518         int err = -ENOBUFS;
519 
520         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
521         if (skb == NULL)
522                 goto errout;
523 
524         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
525                                          RTM_NEWNETCONF, 0, type);
526         if (err < 0) {
527                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
528                 WARN_ON(err == -EMSGSIZE);
529                 kfree_skb(skb);
530                 goto errout;
531         }
532         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
533         return;
534 errout:
535         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
536 }
537 
538 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
539         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
540         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
541 };
542 
543 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
544                                      struct nlmsghdr *nlh)
545 {
546         struct net *net = sock_net(in_skb->sk);
547         struct nlattr *tb[NETCONFA_MAX+1];
548         struct netconfmsg *ncm;
549         struct sk_buff *skb;
550         struct ipv6_devconf *devconf;
551         struct inet6_dev *in6_dev;
552         struct net_device *dev;
553         int ifindex;
554         int err;
555 
556         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
557                           devconf_ipv6_policy);
558         if (err < 0)
559                 goto errout;
560 
561         err = EINVAL;
562         if (!tb[NETCONFA_IFINDEX])
563                 goto errout;
564 
565         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
566         switch (ifindex) {
567         case NETCONFA_IFINDEX_ALL:
568                 devconf = net->ipv6.devconf_all;
569                 break;
570         case NETCONFA_IFINDEX_DEFAULT:
571                 devconf = net->ipv6.devconf_dflt;
572                 break;
573         default:
574                 dev = __dev_get_by_index(net, ifindex);
575                 if (dev == NULL)
576                         goto errout;
577                 in6_dev = __in6_dev_get(dev);
578                 if (in6_dev == NULL)
579                         goto errout;
580                 devconf = &in6_dev->cnf;
581                 break;
582         }
583 
584         err = -ENOBUFS;
585         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
586         if (skb == NULL)
587                 goto errout;
588 
589         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
590                                          NETLINK_CB(in_skb).portid,
591                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
592                                          -1);
593         if (err < 0) {
594                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
595                 WARN_ON(err == -EMSGSIZE);
596                 kfree_skb(skb);
597                 goto errout;
598         }
599         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
600 errout:
601         return err;
602 }
603 
604 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
605                                       struct netlink_callback *cb)
606 {
607         struct net *net = sock_net(skb->sk);
608         int h, s_h;
609         int idx, s_idx;
610         struct net_device *dev;
611         struct inet6_dev *idev;
612         struct hlist_head *head;
613 
614         s_h = cb->args[0];
615         s_idx = idx = cb->args[1];
616 
617         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
618                 idx = 0;
619                 head = &net->dev_index_head[h];
620                 rcu_read_lock();
621                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
622                           net->dev_base_seq;
623                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
624                         if (idx < s_idx)
625                                 goto cont;
626                         idev = __in6_dev_get(dev);
627                         if (!idev)
628                                 goto cont;
629 
630                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
631                                                        &idev->cnf,
632                                                        NETLINK_CB(cb->skb).portid,
633                                                        cb->nlh->nlmsg_seq,
634                                                        RTM_NEWNETCONF,
635                                                        NLM_F_MULTI,
636                                                        -1) <= 0) {
637                                 rcu_read_unlock();
638                                 goto done;
639                         }
640                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
641 cont:
642                         idx++;
643                 }
644                 rcu_read_unlock();
645         }
646         if (h == NETDEV_HASHENTRIES) {
647                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
648                                                net->ipv6.devconf_all,
649                                                NETLINK_CB(cb->skb).portid,
650                                                cb->nlh->nlmsg_seq,
651                                                RTM_NEWNETCONF, NLM_F_MULTI,
652                                                -1) <= 0)
653                         goto done;
654                 else
655                         h++;
656         }
657         if (h == NETDEV_HASHENTRIES + 1) {
658                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
659                                                net->ipv6.devconf_dflt,
660                                                NETLINK_CB(cb->skb).portid,
661                                                cb->nlh->nlmsg_seq,
662                                                RTM_NEWNETCONF, NLM_F_MULTI,
663                                                -1) <= 0)
664                         goto done;
665                 else
666                         h++;
667         }
668 done:
669         cb->args[0] = h;
670         cb->args[1] = idx;
671 
672         return skb->len;
673 }
674 
675 #ifdef CONFIG_SYSCTL
676 static void dev_forward_change(struct inet6_dev *idev)
677 {
678         struct net_device *dev;
679         struct inet6_ifaddr *ifa;
680 
681         if (!idev)
682                 return;
683         dev = idev->dev;
684         if (idev->cnf.forwarding)
685                 dev_disable_lro(dev);
686         if (dev->flags & IFF_MULTICAST) {
687                 if (idev->cnf.forwarding) {
688                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
689                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
690                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
691                 } else {
692                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
693                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
694                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
695                 }
696         }
697 
698         list_for_each_entry(ifa, &idev->addr_list, if_list) {
699                 if (ifa->flags&IFA_F_TENTATIVE)
700                         continue;
701                 if (idev->cnf.forwarding)
702                         addrconf_join_anycast(ifa);
703                 else
704                         addrconf_leave_anycast(ifa);
705         }
706         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
707                                      dev->ifindex, &idev->cnf);
708 }
709 
710 
711 static void addrconf_forward_change(struct net *net, __s32 newf)
712 {
713         struct net_device *dev;
714         struct inet6_dev *idev;
715 
716         for_each_netdev(net, dev) {
717                 idev = __in6_dev_get(dev);
718                 if (idev) {
719                         int changed = (!idev->cnf.forwarding) ^ (!newf);
720                         idev->cnf.forwarding = newf;
721                         if (changed)
722                                 dev_forward_change(idev);
723                 }
724         }
725 }
726 
727 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
728 {
729         struct net *net;
730         int old;
731 
732         if (!rtnl_trylock())
733                 return restart_syscall();
734 
735         net = (struct net *)table->extra2;
736         old = *p;
737         *p = newf;
738 
739         if (p == &net->ipv6.devconf_dflt->forwarding) {
740                 if ((!newf) ^ (!old))
741                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
742                                                      NETCONFA_IFINDEX_DEFAULT,
743                                                      net->ipv6.devconf_dflt);
744                 rtnl_unlock();
745                 return 0;
746         }
747 
748         if (p == &net->ipv6.devconf_all->forwarding) {
749                 net->ipv6.devconf_dflt->forwarding = newf;
750                 addrconf_forward_change(net, newf);
751                 if ((!newf) ^ (!old))
752                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
753                                                      NETCONFA_IFINDEX_ALL,
754                                                      net->ipv6.devconf_all);
755         } else if ((!newf) ^ (!old))
756                 dev_forward_change((struct inet6_dev *)table->extra1);
757         rtnl_unlock();
758 
759         if (newf)
760                 rt6_purge_dflt_routers(net);
761         return 1;
762 }
763 #endif
764 
765 /* Nobody refers to this ifaddr, destroy it */
766 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
767 {
768         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
769 
770 #ifdef NET_REFCNT_DEBUG
771         pr_debug("%s\n", __func__);
772 #endif
773 
774         in6_dev_put(ifp->idev);
775 
776         if (del_timer(&ifp->dad_timer))
777                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
778 
779         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
780                 pr_warn("Freeing alive inet6 address %p\n", ifp);
781                 return;
782         }
783         ip6_rt_put(ifp->rt);
784 
785         kfree_rcu(ifp, rcu);
786 }
787 
788 static void
789 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
790 {
791         struct list_head *p;
792         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
793 
794         /*
795          * Each device address list is sorted in order of scope -
796          * global before linklocal.
797          */
798         list_for_each(p, &idev->addr_list) {
799                 struct inet6_ifaddr *ifa
800                         = list_entry(p, struct inet6_ifaddr, if_list);
801                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
802                         break;
803         }
804 
805         list_add_tail(&ifp->if_list, p);
806 }
807 
808 static u32 inet6_addr_hash(const struct in6_addr *addr)
809 {
810         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
811 }
812 
813 /* On success it returns ifp with increased reference count */
814 
815 static struct inet6_ifaddr *
816 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
817               const struct in6_addr *peer_addr, int pfxlen,
818               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
819 {
820         struct inet6_ifaddr *ifa = NULL;
821         struct rt6_info *rt;
822         unsigned int hash;
823         int err = 0;
824         int addr_type = ipv6_addr_type(addr);
825 
826         if (addr_type == IPV6_ADDR_ANY ||
827             addr_type & IPV6_ADDR_MULTICAST ||
828             (!(idev->dev->flags & IFF_LOOPBACK) &&
829              addr_type & IPV6_ADDR_LOOPBACK))
830                 return ERR_PTR(-EADDRNOTAVAIL);
831 
832         rcu_read_lock_bh();
833         if (idev->dead) {
834                 err = -ENODEV;                  /*XXX*/
835                 goto out2;
836         }
837 
838         if (idev->cnf.disable_ipv6) {
839                 err = -EACCES;
840                 goto out2;
841         }
842 
843         spin_lock(&addrconf_hash_lock);
844 
845         /* Ignore adding duplicate addresses on an interface */
846         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
847                 ADBG(("ipv6_add_addr: already assigned\n"));
848                 err = -EEXIST;
849                 goto out;
850         }
851 
852         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
853 
854         if (ifa == NULL) {
855                 ADBG(("ipv6_add_addr: malloc failed\n"));
856                 err = -ENOBUFS;
857                 goto out;
858         }
859 
860         rt = addrconf_dst_alloc(idev, addr, false);
861         if (IS_ERR(rt)) {
862                 err = PTR_ERR(rt);
863                 goto out;
864         }
865 
866         ifa->addr = *addr;
867         if (peer_addr)
868                 ifa->peer_addr = *peer_addr;
869 
870         spin_lock_init(&ifa->lock);
871         spin_lock_init(&ifa->state_lock);
872         setup_timer(&ifa->dad_timer, addrconf_dad_timer,
873                     (unsigned long)ifa);
874         INIT_HLIST_NODE(&ifa->addr_lst);
875         ifa->scope = scope;
876         ifa->prefix_len = pfxlen;
877         ifa->flags = flags | IFA_F_TENTATIVE;
878         ifa->valid_lft = valid_lft;
879         ifa->prefered_lft = prefered_lft;
880         ifa->cstamp = ifa->tstamp = jiffies;
881         ifa->tokenized = false;
882 
883         ifa->rt = rt;
884 
885         ifa->idev = idev;
886         in6_dev_hold(idev);
887         /* For caller */
888         in6_ifa_hold(ifa);
889 
890         /* Add to big hash table */
891         hash = inet6_addr_hash(addr);
892 
893         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
894         spin_unlock(&addrconf_hash_lock);
895 
896         write_lock(&idev->lock);
897         /* Add to inet6_dev unicast addr list. */
898         ipv6_link_dev_addr(idev, ifa);
899 
900 #ifdef CONFIG_IPV6_PRIVACY
901         if (ifa->flags&IFA_F_TEMPORARY) {
902                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
903                 in6_ifa_hold(ifa);
904         }
905 #endif
906 
907         in6_ifa_hold(ifa);
908         write_unlock(&idev->lock);
909 out2:
910         rcu_read_unlock_bh();
911 
912         if (likely(err == 0))
913                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
914         else {
915                 kfree(ifa);
916                 ifa = ERR_PTR(err);
917         }
918 
919         return ifa;
920 out:
921         spin_unlock(&addrconf_hash_lock);
922         goto out2;
923 }
924 
925 /* This function wants to get referenced ifp and releases it before return */
926 
927 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
928 {
929         struct inet6_ifaddr *ifa, *ifn;
930         struct inet6_dev *idev = ifp->idev;
931         int state;
932         int deleted = 0, onlink = 0;
933         unsigned long expires = jiffies;
934 
935         spin_lock_bh(&ifp->state_lock);
936         state = ifp->state;
937         ifp->state = INET6_IFADDR_STATE_DEAD;
938         spin_unlock_bh(&ifp->state_lock);
939 
940         if (state == INET6_IFADDR_STATE_DEAD)
941                 goto out;
942 
943         spin_lock_bh(&addrconf_hash_lock);
944         hlist_del_init_rcu(&ifp->addr_lst);
945         spin_unlock_bh(&addrconf_hash_lock);
946 
947         write_lock_bh(&idev->lock);
948 #ifdef CONFIG_IPV6_PRIVACY
949         if (ifp->flags&IFA_F_TEMPORARY) {
950                 list_del(&ifp->tmp_list);
951                 if (ifp->ifpub) {
952                         in6_ifa_put(ifp->ifpub);
953                         ifp->ifpub = NULL;
954                 }
955                 __in6_ifa_put(ifp);
956         }
957 #endif
958 
959         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
960                 if (ifa == ifp) {
961                         list_del_init(&ifp->if_list);
962                         __in6_ifa_put(ifp);
963 
964                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
965                                 break;
966                         deleted = 1;
967                         continue;
968                 } else if (ifp->flags & IFA_F_PERMANENT) {
969                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
970                                               ifp->prefix_len)) {
971                                 if (ifa->flags & IFA_F_PERMANENT) {
972                                         onlink = 1;
973                                         if (deleted)
974                                                 break;
975                                 } else {
976                                         unsigned long lifetime;
977 
978                                         if (!onlink)
979                                                 onlink = -1;
980 
981                                         spin_lock(&ifa->lock);
982 
983                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
984                                         /*
985                                          * Note: Because this address is
986                                          * not permanent, lifetime <
987                                          * LONG_MAX / HZ here.
988                                          */
989                                         if (time_before(expires,
990                                                         ifa->tstamp + lifetime * HZ))
991                                                 expires = ifa->tstamp + lifetime * HZ;
992                                         spin_unlock(&ifa->lock);
993                                 }
994                         }
995                 }
996         }
997         write_unlock_bh(&idev->lock);
998 
999         addrconf_del_dad_timer(ifp);
1000 
1001         ipv6_ifa_notify(RTM_DELADDR, ifp);
1002 
1003         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1004 
1005         /*
1006          * Purge or update corresponding prefix
1007          *
1008          * 1) we don't purge prefix here if address was not permanent.
1009          *    prefix is managed by its own lifetime.
1010          * 2) if there're no addresses, delete prefix.
1011          * 3) if there're still other permanent address(es),
1012          *    corresponding prefix is still permanent.
1013          * 4) otherwise, update prefix lifetime to the
1014          *    longest valid lifetime among the corresponding
1015          *    addresses on the device.
1016          *    Note: subsequent RA will update lifetime.
1017          *
1018          * --yoshfuji
1019          */
1020         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1021                 struct in6_addr prefix;
1022                 struct rt6_info *rt;
1023 
1024                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1025 
1026                 rt = addrconf_get_prefix_route(&prefix,
1027                                                ifp->prefix_len,
1028                                                ifp->idev->dev,
1029                                                0, RTF_GATEWAY | RTF_DEFAULT);
1030 
1031                 if (rt) {
1032                         if (onlink == 0) {
1033                                 ip6_del_rt(rt);
1034                                 rt = NULL;
1035                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1036                                 rt6_set_expires(rt, expires);
1037                         }
1038                 }
1039                 ip6_rt_put(rt);
1040         }
1041 
1042         /* clean up prefsrc entries */
1043         rt6_remove_prefsrc(ifp);
1044 out:
1045         in6_ifa_put(ifp);
1046 }
1047 
1048 #ifdef CONFIG_IPV6_PRIVACY
1049 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1050 {
1051         struct inet6_dev *idev = ifp->idev;
1052         struct in6_addr addr, *tmpaddr;
1053         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1054         unsigned long regen_advance;
1055         int tmp_plen;
1056         int ret = 0;
1057         int max_addresses;
1058         u32 addr_flags;
1059         unsigned long now = jiffies;
1060 
1061         write_lock(&idev->lock);
1062         if (ift) {
1063                 spin_lock_bh(&ift->lock);
1064                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1065                 spin_unlock_bh(&ift->lock);
1066                 tmpaddr = &addr;
1067         } else {
1068                 tmpaddr = NULL;
1069         }
1070 retry:
1071         in6_dev_hold(idev);
1072         if (idev->cnf.use_tempaddr <= 0) {
1073                 write_unlock(&idev->lock);
1074                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1075                 in6_dev_put(idev);
1076                 ret = -1;
1077                 goto out;
1078         }
1079         spin_lock_bh(&ifp->lock);
1080         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1081                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1082                 spin_unlock_bh(&ifp->lock);
1083                 write_unlock(&idev->lock);
1084                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1085                         __func__);
1086                 in6_dev_put(idev);
1087                 ret = -1;
1088                 goto out;
1089         }
1090         in6_ifa_hold(ifp);
1091         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1092         __ipv6_try_regen_rndid(idev, tmpaddr);
1093         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1094         age = (now - ifp->tstamp) / HZ;
1095         tmp_valid_lft = min_t(__u32,
1096                               ifp->valid_lft,
1097                               idev->cnf.temp_valid_lft + age);
1098         tmp_prefered_lft = min_t(__u32,
1099                                  ifp->prefered_lft,
1100                                  idev->cnf.temp_prefered_lft + age -
1101                                  idev->cnf.max_desync_factor);
1102         tmp_plen = ifp->prefix_len;
1103         max_addresses = idev->cnf.max_addresses;
1104         tmp_tstamp = ifp->tstamp;
1105         spin_unlock_bh(&ifp->lock);
1106 
1107         regen_advance = idev->cnf.regen_max_retry *
1108                         idev->cnf.dad_transmits *
1109                         idev->nd_parms->retrans_time / HZ;
1110         write_unlock(&idev->lock);
1111 
1112         /* A temporary address is created only if this calculated Preferred
1113          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1114          * an implementation must not create a temporary address with a zero
1115          * Preferred Lifetime.
1116          */
1117         if (tmp_prefered_lft <= regen_advance) {
1118                 in6_ifa_put(ifp);
1119                 in6_dev_put(idev);
1120                 ret = -1;
1121                 goto out;
1122         }
1123 
1124         addr_flags = IFA_F_TEMPORARY;
1125         /* set in addrconf_prefix_rcv() */
1126         if (ifp->flags & IFA_F_OPTIMISTIC)
1127                 addr_flags |= IFA_F_OPTIMISTIC;
1128 
1129         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1130                             ipv6_addr_scope(&addr), addr_flags,
1131                             tmp_valid_lft, tmp_prefered_lft);
1132         if (IS_ERR(ift)) {
1133                 in6_ifa_put(ifp);
1134                 in6_dev_put(idev);
1135                 pr_info("%s: retry temporary address regeneration\n", __func__);
1136                 tmpaddr = &addr;
1137                 write_lock(&idev->lock);
1138                 goto retry;
1139         }
1140 
1141         spin_lock_bh(&ift->lock);
1142         ift->ifpub = ifp;
1143         ift->cstamp = now;
1144         ift->tstamp = tmp_tstamp;
1145         spin_unlock_bh(&ift->lock);
1146 
1147         addrconf_dad_start(ift);
1148         in6_ifa_put(ift);
1149         in6_dev_put(idev);
1150 out:
1151         return ret;
1152 }
1153 #endif
1154 
1155 /*
1156  *      Choose an appropriate source address (RFC3484)
1157  */
1158 enum {
1159         IPV6_SADDR_RULE_INIT = 0,
1160         IPV6_SADDR_RULE_LOCAL,
1161         IPV6_SADDR_RULE_SCOPE,
1162         IPV6_SADDR_RULE_PREFERRED,
1163 #ifdef CONFIG_IPV6_MIP6
1164         IPV6_SADDR_RULE_HOA,
1165 #endif
1166         IPV6_SADDR_RULE_OIF,
1167         IPV6_SADDR_RULE_LABEL,
1168 #ifdef CONFIG_IPV6_PRIVACY
1169         IPV6_SADDR_RULE_PRIVACY,
1170 #endif
1171         IPV6_SADDR_RULE_ORCHID,
1172         IPV6_SADDR_RULE_PREFIX,
1173         IPV6_SADDR_RULE_MAX
1174 };
1175 
1176 struct ipv6_saddr_score {
1177         int                     rule;
1178         int                     addr_type;
1179         struct inet6_ifaddr     *ifa;
1180         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1181         int                     scopedist;
1182         int                     matchlen;
1183 };
1184 
1185 struct ipv6_saddr_dst {
1186         const struct in6_addr *addr;
1187         int ifindex;
1188         int scope;
1189         int label;
1190         unsigned int prefs;
1191 };
1192 
1193 static inline int ipv6_saddr_preferred(int type)
1194 {
1195         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1196                 return 1;
1197         return 0;
1198 }
1199 
1200 static int ipv6_get_saddr_eval(struct net *net,
1201                                struct ipv6_saddr_score *score,
1202                                struct ipv6_saddr_dst *dst,
1203                                int i)
1204 {
1205         int ret;
1206 
1207         if (i <= score->rule) {
1208                 switch (i) {
1209                 case IPV6_SADDR_RULE_SCOPE:
1210                         ret = score->scopedist;
1211                         break;
1212                 case IPV6_SADDR_RULE_PREFIX:
1213                         ret = score->matchlen;
1214                         break;
1215                 default:
1216                         ret = !!test_bit(i, score->scorebits);
1217                 }
1218                 goto out;
1219         }
1220 
1221         switch (i) {
1222         case IPV6_SADDR_RULE_INIT:
1223                 /* Rule 0: remember if hiscore is not ready yet */
1224                 ret = !!score->ifa;
1225                 break;
1226         case IPV6_SADDR_RULE_LOCAL:
1227                 /* Rule 1: Prefer same address */
1228                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1229                 break;
1230         case IPV6_SADDR_RULE_SCOPE:
1231                 /* Rule 2: Prefer appropriate scope
1232                  *
1233                  *      ret
1234                  *       ^
1235                  *    -1 |  d 15
1236                  *    ---+--+-+---> scope
1237                  *       |
1238                  *       |             d is scope of the destination.
1239                  *  B-d  |  \
1240                  *       |   \      <- smaller scope is better if
1241                  *  B-15 |    \        if scope is enough for destinaion.
1242                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1243                  * d-C-1 | /
1244                  *       |/         <- greater is better
1245                  *   -C  /             if scope is not enough for destination.
1246                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1247                  *
1248                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1249                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1250                  * Assume B = 0 and we get C > 29.
1251                  */
1252                 ret = __ipv6_addr_src_scope(score->addr_type);
1253                 if (ret >= dst->scope)
1254                         ret = -ret;
1255                 else
1256                         ret -= 128;     /* 30 is enough */
1257                 score->scopedist = ret;
1258                 break;
1259         case IPV6_SADDR_RULE_PREFERRED:
1260                 /* Rule 3: Avoid deprecated and optimistic addresses */
1261                 ret = ipv6_saddr_preferred(score->addr_type) ||
1262                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1263                 break;
1264 #ifdef CONFIG_IPV6_MIP6
1265         case IPV6_SADDR_RULE_HOA:
1266             {
1267                 /* Rule 4: Prefer home address */
1268                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1269                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1270                 break;
1271             }
1272 #endif
1273         case IPV6_SADDR_RULE_OIF:
1274                 /* Rule 5: Prefer outgoing interface */
1275                 ret = (!dst->ifindex ||
1276                        dst->ifindex == score->ifa->idev->dev->ifindex);
1277                 break;
1278         case IPV6_SADDR_RULE_LABEL:
1279                 /* Rule 6: Prefer matching label */
1280                 ret = ipv6_addr_label(net,
1281                                       &score->ifa->addr, score->addr_type,
1282                                       score->ifa->idev->dev->ifindex) == dst->label;
1283                 break;
1284 #ifdef CONFIG_IPV6_PRIVACY
1285         case IPV6_SADDR_RULE_PRIVACY:
1286             {
1287                 /* Rule 7: Prefer public address
1288                  * Note: prefer temporary address if use_tempaddr >= 2
1289                  */
1290                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1291                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1292                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1293                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1294                 break;
1295             }
1296 #endif
1297         case IPV6_SADDR_RULE_ORCHID:
1298                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1299                  *          non-ORCHID vs non-ORCHID
1300                  */
1301                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1302                         ipv6_addr_orchid(dst->addr));
1303                 break;
1304         case IPV6_SADDR_RULE_PREFIX:
1305                 /* Rule 8: Use longest matching prefix */
1306                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1307                 if (ret > score->ifa->prefix_len)
1308                         ret = score->ifa->prefix_len;
1309                 score->matchlen = ret;
1310                 break;
1311         default:
1312                 ret = 0;
1313         }
1314 
1315         if (ret)
1316                 __set_bit(i, score->scorebits);
1317         score->rule = i;
1318 out:
1319         return ret;
1320 }
1321 
1322 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1323                        const struct in6_addr *daddr, unsigned int prefs,
1324                        struct in6_addr *saddr)
1325 {
1326         struct ipv6_saddr_score scores[2],
1327                                 *score = &scores[0], *hiscore = &scores[1];
1328         struct ipv6_saddr_dst dst;
1329         struct net_device *dev;
1330         int dst_type;
1331 
1332         dst_type = __ipv6_addr_type(daddr);
1333         dst.addr = daddr;
1334         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1335         dst.scope = __ipv6_addr_src_scope(dst_type);
1336         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1337         dst.prefs = prefs;
1338 
1339         hiscore->rule = -1;
1340         hiscore->ifa = NULL;
1341 
1342         rcu_read_lock();
1343 
1344         for_each_netdev_rcu(net, dev) {
1345                 struct inet6_dev *idev;
1346 
1347                 /* Candidate Source Address (section 4)
1348                  *  - multicast and link-local destination address,
1349                  *    the set of candidate source address MUST only
1350                  *    include addresses assigned to interfaces
1351                  *    belonging to the same link as the outgoing
1352                  *    interface.
1353                  * (- For site-local destination addresses, the
1354                  *    set of candidate source addresses MUST only
1355                  *    include addresses assigned to interfaces
1356                  *    belonging to the same site as the outgoing
1357                  *    interface.)
1358                  */
1359                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1360                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1361                     dst.ifindex && dev->ifindex != dst.ifindex)
1362                         continue;
1363 
1364                 idev = __in6_dev_get(dev);
1365                 if (!idev)
1366                         continue;
1367 
1368                 read_lock_bh(&idev->lock);
1369                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1370                         int i;
1371 
1372                         /*
1373                          * - Tentative Address (RFC2462 section 5.4)
1374                          *  - A tentative address is not considered
1375                          *    "assigned to an interface" in the traditional
1376                          *    sense, unless it is also flagged as optimistic.
1377                          * - Candidate Source Address (section 4)
1378                          *  - In any case, anycast addresses, multicast
1379                          *    addresses, and the unspecified address MUST
1380                          *    NOT be included in a candidate set.
1381                          */
1382                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1383                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1384                                 continue;
1385 
1386                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1387 
1388                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1389                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1390                                 LIMIT_NETDEBUG(KERN_DEBUG
1391                                                "ADDRCONF: unspecified / multicast address "
1392                                                "assigned as unicast address on %s",
1393                                                dev->name);
1394                                 continue;
1395                         }
1396 
1397                         score->rule = -1;
1398                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1399 
1400                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1401                                 int minihiscore, miniscore;
1402 
1403                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1404                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1405 
1406                                 if (minihiscore > miniscore) {
1407                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1408                                             score->scopedist > 0) {
1409                                                 /*
1410                                                  * special case:
1411                                                  * each remaining entry
1412                                                  * has too small (not enough)
1413                                                  * scope, because ifa entries
1414                                                  * are sorted by their scope
1415                                                  * values.
1416                                                  */
1417                                                 goto try_nextdev;
1418                                         }
1419                                         break;
1420                                 } else if (minihiscore < miniscore) {
1421                                         if (hiscore->ifa)
1422                                                 in6_ifa_put(hiscore->ifa);
1423 
1424                                         in6_ifa_hold(score->ifa);
1425 
1426                                         swap(hiscore, score);
1427 
1428                                         /* restore our iterator */
1429                                         score->ifa = hiscore->ifa;
1430 
1431                                         break;
1432                                 }
1433                         }
1434                 }
1435 try_nextdev:
1436                 read_unlock_bh(&idev->lock);
1437         }
1438         rcu_read_unlock();
1439 
1440         if (!hiscore->ifa)
1441                 return -EADDRNOTAVAIL;
1442 
1443         *saddr = hiscore->ifa->addr;
1444         in6_ifa_put(hiscore->ifa);
1445         return 0;
1446 }
1447 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1448 
1449 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1450                       unsigned char banned_flags)
1451 {
1452         struct inet6_ifaddr *ifp;
1453         int err = -EADDRNOTAVAIL;
1454 
1455         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1456                 if (ifp->scope == IFA_LINK &&
1457                     !(ifp->flags & banned_flags)) {
1458                         *addr = ifp->addr;
1459                         err = 0;
1460                         break;
1461                 }
1462         }
1463         return err;
1464 }
1465 
1466 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1467                     unsigned char banned_flags)
1468 {
1469         struct inet6_dev *idev;
1470         int err = -EADDRNOTAVAIL;
1471 
1472         rcu_read_lock();
1473         idev = __in6_dev_get(dev);
1474         if (idev) {
1475                 read_lock_bh(&idev->lock);
1476                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1477                 read_unlock_bh(&idev->lock);
1478         }
1479         rcu_read_unlock();
1480         return err;
1481 }
1482 
1483 static int ipv6_count_addresses(struct inet6_dev *idev)
1484 {
1485         int cnt = 0;
1486         struct inet6_ifaddr *ifp;
1487 
1488         read_lock_bh(&idev->lock);
1489         list_for_each_entry(ifp, &idev->addr_list, if_list)
1490                 cnt++;
1491         read_unlock_bh(&idev->lock);
1492         return cnt;
1493 }
1494 
1495 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1496                   const struct net_device *dev, int strict)
1497 {
1498         struct inet6_ifaddr *ifp;
1499         unsigned int hash = inet6_addr_hash(addr);
1500 
1501         rcu_read_lock_bh();
1502         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1503                 if (!net_eq(dev_net(ifp->idev->dev), net))
1504                         continue;
1505                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1506                     !(ifp->flags&IFA_F_TENTATIVE) &&
1507                     (dev == NULL || ifp->idev->dev == dev ||
1508                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1509                         rcu_read_unlock_bh();
1510                         return 1;
1511                 }
1512         }
1513 
1514         rcu_read_unlock_bh();
1515         return 0;
1516 }
1517 EXPORT_SYMBOL(ipv6_chk_addr);
1518 
1519 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1520                                struct net_device *dev)
1521 {
1522         unsigned int hash = inet6_addr_hash(addr);
1523         struct inet6_ifaddr *ifp;
1524 
1525         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1526                 if (!net_eq(dev_net(ifp->idev->dev), net))
1527                         continue;
1528                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1529                         if (dev == NULL || ifp->idev->dev == dev)
1530                                 return true;
1531                 }
1532         }
1533         return false;
1534 }
1535 
1536 /* Compares an address/prefix_len with addresses on device @dev.
1537  * If one is found it returns true.
1538  */
1539 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1540         const unsigned int prefix_len, struct net_device *dev)
1541 {
1542         struct inet6_dev *idev;
1543         struct inet6_ifaddr *ifa;
1544         bool ret = false;
1545 
1546         rcu_read_lock();
1547         idev = __in6_dev_get(dev);
1548         if (idev) {
1549                 read_lock_bh(&idev->lock);
1550                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1551                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1552                         if (ret)
1553                                 break;
1554                 }
1555                 read_unlock_bh(&idev->lock);
1556         }
1557         rcu_read_unlock();
1558 
1559         return ret;
1560 }
1561 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1562 
1563 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1564 {
1565         struct inet6_dev *idev;
1566         struct inet6_ifaddr *ifa;
1567         int     onlink;
1568 
1569         onlink = 0;
1570         rcu_read_lock();
1571         idev = __in6_dev_get(dev);
1572         if (idev) {
1573                 read_lock_bh(&idev->lock);
1574                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1575                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1576                                                    ifa->prefix_len);
1577                         if (onlink)
1578                                 break;
1579                 }
1580                 read_unlock_bh(&idev->lock);
1581         }
1582         rcu_read_unlock();
1583         return onlink;
1584 }
1585 EXPORT_SYMBOL(ipv6_chk_prefix);
1586 
1587 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1588                                      struct net_device *dev, int strict)
1589 {
1590         struct inet6_ifaddr *ifp, *result = NULL;
1591         unsigned int hash = inet6_addr_hash(addr);
1592 
1593         rcu_read_lock_bh();
1594         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1595                 if (!net_eq(dev_net(ifp->idev->dev), net))
1596                         continue;
1597                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1598                         if (dev == NULL || ifp->idev->dev == dev ||
1599                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1600                                 result = ifp;
1601                                 in6_ifa_hold(ifp);
1602                                 break;
1603                         }
1604                 }
1605         }
1606         rcu_read_unlock_bh();
1607 
1608         return result;
1609 }
1610 
1611 /* Gets referenced address, destroys ifaddr */
1612 
1613 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1614 {
1615         if (ifp->flags&IFA_F_PERMANENT) {
1616                 spin_lock_bh(&ifp->lock);
1617                 addrconf_del_dad_timer(ifp);
1618                 ifp->flags |= IFA_F_TENTATIVE;
1619                 if (dad_failed)
1620                         ifp->flags |= IFA_F_DADFAILED;
1621                 spin_unlock_bh(&ifp->lock);
1622                 if (dad_failed)
1623                         ipv6_ifa_notify(0, ifp);
1624                 in6_ifa_put(ifp);
1625 #ifdef CONFIG_IPV6_PRIVACY
1626         } else if (ifp->flags&IFA_F_TEMPORARY) {
1627                 struct inet6_ifaddr *ifpub;
1628                 spin_lock_bh(&ifp->lock);
1629                 ifpub = ifp->ifpub;
1630                 if (ifpub) {
1631                         in6_ifa_hold(ifpub);
1632                         spin_unlock_bh(&ifp->lock);
1633                         ipv6_create_tempaddr(ifpub, ifp);
1634                         in6_ifa_put(ifpub);
1635                 } else {
1636                         spin_unlock_bh(&ifp->lock);
1637                 }
1638                 ipv6_del_addr(ifp);
1639 #endif
1640         } else
1641                 ipv6_del_addr(ifp);
1642 }
1643 
1644 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1645 {
1646         int err = -ENOENT;
1647 
1648         spin_lock(&ifp->state_lock);
1649         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1650                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1651                 err = 0;
1652         }
1653         spin_unlock(&ifp->state_lock);
1654 
1655         return err;
1656 }
1657 
1658 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1659 {
1660         struct inet6_dev *idev = ifp->idev;
1661 
1662         if (addrconf_dad_end(ifp)) {
1663                 in6_ifa_put(ifp);
1664                 return;
1665         }
1666 
1667         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1668                              ifp->idev->dev->name, &ifp->addr);
1669 
1670         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1671                 struct in6_addr addr;
1672 
1673                 addr.s6_addr32[0] = htonl(0xfe800000);
1674                 addr.s6_addr32[1] = 0;
1675 
1676                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1677                     ipv6_addr_equal(&ifp->addr, &addr)) {
1678                         /* DAD failed for link-local based on MAC address */
1679                         idev->cnf.disable_ipv6 = 1;
1680 
1681                         pr_info("%s: IPv6 being disabled!\n",
1682                                 ifp->idev->dev->name);
1683                 }
1684         }
1685 
1686         addrconf_dad_stop(ifp, 1);
1687 }
1688 
1689 /* Join to solicited addr multicast group. */
1690 
1691 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1692 {
1693         struct in6_addr maddr;
1694 
1695         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1696                 return;
1697 
1698         addrconf_addr_solict_mult(addr, &maddr);
1699         ipv6_dev_mc_inc(dev, &maddr);
1700 }
1701 
1702 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1703 {
1704         struct in6_addr maddr;
1705 
1706         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1707                 return;
1708 
1709         addrconf_addr_solict_mult(addr, &maddr);
1710         __ipv6_dev_mc_dec(idev, &maddr);
1711 }
1712 
1713 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1714 {
1715         struct in6_addr addr;
1716         if (ifp->prefix_len == 127) /* RFC 6164 */
1717                 return;
1718         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1719         if (ipv6_addr_any(&addr))
1720                 return;
1721         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1722 }
1723 
1724 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1725 {
1726         struct in6_addr addr;
1727         if (ifp->prefix_len == 127) /* RFC 6164 */
1728                 return;
1729         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1730         if (ipv6_addr_any(&addr))
1731                 return;
1732         __ipv6_dev_ac_dec(ifp->idev, &addr);
1733 }
1734 
1735 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1736 {
1737         if (dev->addr_len != ETH_ALEN)
1738                 return -1;
1739         memcpy(eui, dev->dev_addr, 3);
1740         memcpy(eui + 5, dev->dev_addr + 3, 3);
1741 
1742         /*
1743          * The zSeries OSA network cards can be shared among various
1744          * OS instances, but the OSA cards have only one MAC address.
1745          * This leads to duplicate address conflicts in conjunction
1746          * with IPv6 if more than one instance uses the same card.
1747          *
1748          * The driver for these cards can deliver a unique 16-bit
1749          * identifier for each instance sharing the same card.  It is
1750          * placed instead of 0xFFFE in the interface identifier.  The
1751          * "u" bit of the interface identifier is not inverted in this
1752          * case.  Hence the resulting interface identifier has local
1753          * scope according to RFC2373.
1754          */
1755         if (dev->dev_id) {
1756                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1757                 eui[4] = dev->dev_id & 0xFF;
1758         } else {
1759                 eui[3] = 0xFF;
1760                 eui[4] = 0xFE;
1761                 eui[0] ^= 2;
1762         }
1763         return 0;
1764 }
1765 
1766 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1767 {
1768         if (dev->addr_len != IEEE802154_ADDR_LEN)
1769                 return -1;
1770         memcpy(eui, dev->dev_addr, 8);
1771         eui[0] ^= 2;
1772         return 0;
1773 }
1774 
1775 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1776 {
1777         union fwnet_hwaddr *ha;
1778 
1779         if (dev->addr_len != FWNET_ALEN)
1780                 return -1;
1781 
1782         ha = (union fwnet_hwaddr *)dev->dev_addr;
1783 
1784         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1785         eui[0] ^= 2;
1786         return 0;
1787 }
1788 
1789 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1790 {
1791         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1792         if (dev->addr_len != ARCNET_ALEN)
1793                 return -1;
1794         memset(eui, 0, 7);
1795         eui[7] = *(u8 *)dev->dev_addr;
1796         return 0;
1797 }
1798 
1799 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1800 {
1801         if (dev->addr_len != INFINIBAND_ALEN)
1802                 return -1;
1803         memcpy(eui, dev->dev_addr + 12, 8);
1804         eui[0] |= 2;
1805         return 0;
1806 }
1807 
1808 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1809 {
1810         if (addr == 0)
1811                 return -1;
1812         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1813                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1814                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1815                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1816                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1817                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1818         eui[1] = 0;
1819         eui[2] = 0x5E;
1820         eui[3] = 0xFE;
1821         memcpy(eui + 4, &addr, 4);
1822         return 0;
1823 }
1824 
1825 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1826 {
1827         if (dev->priv_flags & IFF_ISATAP)
1828                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1829         return -1;
1830 }
1831 
1832 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1833 {
1834         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1835 }
1836 
1837 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1838 {
1839         switch (dev->type) {
1840         case ARPHRD_ETHER:
1841         case ARPHRD_FDDI:
1842                 return addrconf_ifid_eui48(eui, dev);
1843         case ARPHRD_ARCNET:
1844                 return addrconf_ifid_arcnet(eui, dev);
1845         case ARPHRD_INFINIBAND:
1846                 return addrconf_ifid_infiniband(eui, dev);
1847         case ARPHRD_SIT:
1848                 return addrconf_ifid_sit(eui, dev);
1849         case ARPHRD_IPGRE:
1850                 return addrconf_ifid_gre(eui, dev);
1851         case ARPHRD_IEEE802154:
1852                 return addrconf_ifid_eui64(eui, dev);
1853         case ARPHRD_IEEE1394:
1854                 return addrconf_ifid_ieee1394(eui, dev);
1855         }
1856         return -1;
1857 }
1858 
1859 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1860 {
1861         int err = -1;
1862         struct inet6_ifaddr *ifp;
1863 
1864         read_lock_bh(&idev->lock);
1865         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1866                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1867                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1868                         err = 0;
1869                         break;
1870                 }
1871         }
1872         read_unlock_bh(&idev->lock);
1873         return err;
1874 }
1875 
1876 #ifdef CONFIG_IPV6_PRIVACY
1877 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1878 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1879 {
1880 regen:
1881         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1882         idev->rndid[0] &= ~0x02;
1883 
1884         /*
1885          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1886          * check if generated address is not inappropriate
1887          *
1888          *  - Reserved subnet anycast (RFC 2526)
1889          *      11111101 11....11 1xxxxxxx
1890          *  - ISATAP (RFC4214) 6.1
1891          *      00-00-5E-FE-xx-xx-xx-xx
1892          *  - value 0
1893          *  - XXX: already assigned to an address on the device
1894          */
1895         if (idev->rndid[0] == 0xfd &&
1896             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1897             (idev->rndid[7]&0x80))
1898                 goto regen;
1899         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1900                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1901                         goto regen;
1902                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1903                         goto regen;
1904         }
1905 }
1906 
1907 static void ipv6_regen_rndid(unsigned long data)
1908 {
1909         struct inet6_dev *idev = (struct inet6_dev *) data;
1910         unsigned long expires;
1911 
1912         rcu_read_lock_bh();
1913         write_lock_bh(&idev->lock);
1914 
1915         if (idev->dead)
1916                 goto out;
1917 
1918         __ipv6_regen_rndid(idev);
1919 
1920         expires = jiffies +
1921                 idev->cnf.temp_prefered_lft * HZ -
1922                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1923                 idev->cnf.max_desync_factor * HZ;
1924         if (time_before(expires, jiffies)) {
1925                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1926                         __func__, idev->dev->name);
1927                 goto out;
1928         }
1929 
1930         if (!mod_timer(&idev->regen_timer, expires))
1931                 in6_dev_hold(idev);
1932 
1933 out:
1934         write_unlock_bh(&idev->lock);
1935         rcu_read_unlock_bh();
1936         in6_dev_put(idev);
1937 }
1938 
1939 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1940 {
1941         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1942                 __ipv6_regen_rndid(idev);
1943 }
1944 #endif
1945 
1946 /*
1947  *      Add prefix route.
1948  */
1949 
1950 static void
1951 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1952                       unsigned long expires, u32 flags)
1953 {
1954         struct fib6_config cfg = {
1955                 .fc_table = RT6_TABLE_PREFIX,
1956                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1957                 .fc_ifindex = dev->ifindex,
1958                 .fc_expires = expires,
1959                 .fc_dst_len = plen,
1960                 .fc_flags = RTF_UP | flags,
1961                 .fc_nlinfo.nl_net = dev_net(dev),
1962                 .fc_protocol = RTPROT_KERNEL,
1963         };
1964 
1965         cfg.fc_dst = *pfx;
1966 
1967         /* Prevent useless cloning on PtP SIT.
1968            This thing is done here expecting that the whole
1969            class of non-broadcast devices need not cloning.
1970          */
1971 #if IS_ENABLED(CONFIG_IPV6_SIT)
1972         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1973                 cfg.fc_flags |= RTF_NONEXTHOP;
1974 #endif
1975 
1976         ip6_route_add(&cfg);
1977 }
1978 
1979 
1980 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1981                                                   int plen,
1982                                                   const struct net_device *dev,
1983                                                   u32 flags, u32 noflags)
1984 {
1985         struct fib6_node *fn;
1986         struct rt6_info *rt = NULL;
1987         struct fib6_table *table;
1988 
1989         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1990         if (table == NULL)
1991                 return NULL;
1992 
1993         read_lock_bh(&table->tb6_lock);
1994         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1995         if (!fn)
1996                 goto out;
1997         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1998                 if (rt->dst.dev->ifindex != dev->ifindex)
1999                         continue;
2000                 if ((rt->rt6i_flags & flags) != flags)
2001                         continue;
2002                 if ((rt->rt6i_flags & noflags) != 0)
2003                         continue;
2004                 dst_hold(&rt->dst);
2005                 break;
2006         }
2007 out:
2008         read_unlock_bh(&table->tb6_lock);
2009         return rt;
2010 }
2011 
2012 
2013 /* Create "default" multicast route to the interface */
2014 
2015 static void addrconf_add_mroute(struct net_device *dev)
2016 {
2017         struct fib6_config cfg = {
2018                 .fc_table = RT6_TABLE_LOCAL,
2019                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2020                 .fc_ifindex = dev->ifindex,
2021                 .fc_dst_len = 8,
2022                 .fc_flags = RTF_UP,
2023                 .fc_nlinfo.nl_net = dev_net(dev),
2024         };
2025 
2026         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2027 
2028         ip6_route_add(&cfg);
2029 }
2030 
2031 #if IS_ENABLED(CONFIG_IPV6_SIT)
2032 static void sit_route_add(struct net_device *dev)
2033 {
2034         struct fib6_config cfg = {
2035                 .fc_table = RT6_TABLE_MAIN,
2036                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2037                 .fc_ifindex = dev->ifindex,
2038                 .fc_dst_len = 96,
2039                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2040                 .fc_nlinfo.nl_net = dev_net(dev),
2041         };
2042 
2043         /* prefix length - 96 bits "::d.d.d.d" */
2044         ip6_route_add(&cfg);
2045 }
2046 #endif
2047 
2048 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2049 {
2050         struct inet6_dev *idev;
2051 
2052         ASSERT_RTNL();
2053 
2054         idev = ipv6_find_idev(dev);
2055         if (!idev)
2056                 return ERR_PTR(-ENOBUFS);
2057 
2058         if (idev->cnf.disable_ipv6)
2059                 return ERR_PTR(-EACCES);
2060 
2061         /* Add default multicast route */
2062         if (!(dev->flags & IFF_LOOPBACK))
2063                 addrconf_add_mroute(dev);
2064 
2065         return idev;
2066 }
2067 
2068 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2069 {
2070         struct prefix_info *pinfo;
2071         __u32 valid_lft;
2072         __u32 prefered_lft;
2073         int addr_type;
2074         struct inet6_dev *in6_dev;
2075         struct net *net = dev_net(dev);
2076 
2077         pinfo = (struct prefix_info *) opt;
2078 
2079         if (len < sizeof(struct prefix_info)) {
2080                 ADBG(("addrconf: prefix option too short\n"));
2081                 return;
2082         }
2083 
2084         /*
2085          *      Validation checks ([ADDRCONF], page 19)
2086          */
2087 
2088         addr_type = ipv6_addr_type(&pinfo->prefix);
2089 
2090         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2091                 return;
2092 
2093         valid_lft = ntohl(pinfo->valid);
2094         prefered_lft = ntohl(pinfo->prefered);
2095 
2096         if (prefered_lft > valid_lft) {
2097                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2098                 return;
2099         }
2100 
2101         in6_dev = in6_dev_get(dev);
2102 
2103         if (in6_dev == NULL) {
2104                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2105                                     dev->name);
2106                 return;
2107         }
2108 
2109         /*
2110          *      Two things going on here:
2111          *      1) Add routes for on-link prefixes
2112          *      2) Configure prefixes with the auto flag set
2113          */
2114 
2115         if (pinfo->onlink) {
2116                 struct rt6_info *rt;
2117                 unsigned long rt_expires;
2118 
2119                 /* Avoid arithmetic overflow. Really, we could
2120                  * save rt_expires in seconds, likely valid_lft,
2121                  * but it would require division in fib gc, that it
2122                  * not good.
2123                  */
2124                 if (HZ > USER_HZ)
2125                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2126                 else
2127                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2128 
2129                 if (addrconf_finite_timeout(rt_expires))
2130                         rt_expires *= HZ;
2131 
2132                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2133                                                pinfo->prefix_len,
2134                                                dev,
2135                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2136                                                RTF_GATEWAY | RTF_DEFAULT);
2137 
2138                 if (rt) {
2139                         /* Autoconf prefix route */
2140                         if (valid_lft == 0) {
2141                                 ip6_del_rt(rt);
2142                                 rt = NULL;
2143                         } else if (addrconf_finite_timeout(rt_expires)) {
2144                                 /* not infinity */
2145                                 rt6_set_expires(rt, jiffies + rt_expires);
2146                         } else {
2147                                 rt6_clean_expires(rt);
2148                         }
2149                 } else if (valid_lft) {
2150                         clock_t expires = 0;
2151                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2152                         if (addrconf_finite_timeout(rt_expires)) {
2153                                 /* not infinity */
2154                                 flags |= RTF_EXPIRES;
2155                                 expires = jiffies_to_clock_t(rt_expires);
2156                         }
2157                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2158                                               dev, expires, flags);
2159                 }
2160                 ip6_rt_put(rt);
2161         }
2162 
2163         /* Try to figure out our local address for this prefix */
2164 
2165         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2166                 struct inet6_ifaddr *ifp;
2167                 struct in6_addr addr;
2168                 int create = 0, update_lft = 0;
2169                 bool tokenized = false;
2170 
2171                 if (pinfo->prefix_len == 64) {
2172                         memcpy(&addr, &pinfo->prefix, 8);
2173 
2174                         if (!ipv6_addr_any(&in6_dev->token)) {
2175                                 read_lock_bh(&in6_dev->lock);
2176                                 memcpy(addr.s6_addr + 8,
2177                                        in6_dev->token.s6_addr + 8, 8);
2178                                 read_unlock_bh(&in6_dev->lock);
2179                                 tokenized = true;
2180                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2181                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2182                                 in6_dev_put(in6_dev);
2183                                 return;
2184                         }
2185                         goto ok;
2186                 }
2187                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2188                                     pinfo->prefix_len);
2189                 in6_dev_put(in6_dev);
2190                 return;
2191 
2192 ok:
2193 
2194                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2195 
2196                 if (ifp == NULL && valid_lft) {
2197                         int max_addresses = in6_dev->cnf.max_addresses;
2198                         u32 addr_flags = 0;
2199 
2200 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2201                         if (in6_dev->cnf.optimistic_dad &&
2202                             !net->ipv6.devconf_all->forwarding && sllao)
2203                                 addr_flags = IFA_F_OPTIMISTIC;
2204 #endif
2205 
2206                         /* Do not allow to create too much of autoconfigured
2207                          * addresses; this would be too easy way to crash kernel.
2208                          */
2209                         if (!max_addresses ||
2210                             ipv6_count_addresses(in6_dev) < max_addresses)
2211                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2212                                                     pinfo->prefix_len,
2213                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2214                                                     addr_flags, valid_lft,
2215                                                     prefered_lft);
2216 
2217                         if (IS_ERR_OR_NULL(ifp)) {
2218                                 in6_dev_put(in6_dev);
2219                                 return;
2220                         }
2221 
2222                         update_lft = 0;
2223                         create = 1;
2224                         ifp->cstamp = jiffies;
2225                         ifp->tokenized = tokenized;
2226                         addrconf_dad_start(ifp);
2227                 }
2228 
2229                 if (ifp) {
2230                         int flags;
2231                         unsigned long now;
2232 #ifdef CONFIG_IPV6_PRIVACY
2233                         struct inet6_ifaddr *ift;
2234 #endif
2235                         u32 stored_lft;
2236 
2237                         /* update lifetime (RFC2462 5.5.3 e) */
2238                         spin_lock(&ifp->lock);
2239                         now = jiffies;
2240                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2241                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2242                         else
2243                                 stored_lft = 0;
2244                         if (!update_lft && !create && stored_lft) {
2245                                 if (valid_lft > MIN_VALID_LIFETIME ||
2246                                     valid_lft > stored_lft)
2247                                         update_lft = 1;
2248                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
2249                                         /* valid_lft <= stored_lft is always true */
2250                                         /*
2251                                          * RFC 4862 Section 5.5.3e:
2252                                          * "Note that the preferred lifetime of
2253                                          *  the corresponding address is always
2254                                          *  reset to the Preferred Lifetime in
2255                                          *  the received Prefix Information
2256                                          *  option, regardless of whether the
2257                                          *  valid lifetime is also reset or
2258                                          *  ignored."
2259                                          *
2260                                          *  So if the preferred lifetime in
2261                                          *  this advertisement is different
2262                                          *  than what we have stored, but the
2263                                          *  valid lifetime is invalid, just
2264                                          *  reset prefered_lft.
2265                                          *
2266                                          *  We must set the valid lifetime
2267                                          *  to the stored lifetime since we'll
2268                                          *  be updating the timestamp below,
2269                                          *  else we'll set it back to the
2270                                          *  minimum.
2271                                          */
2272                                         if (prefered_lft != ifp->prefered_lft) {
2273                                                 valid_lft = stored_lft;
2274                                                 update_lft = 1;
2275                                         }
2276                                 } else {
2277                                         valid_lft = MIN_VALID_LIFETIME;
2278                                         if (valid_lft < prefered_lft)
2279                                                 prefered_lft = valid_lft;
2280                                         update_lft = 1;
2281                                 }
2282                         }
2283 
2284                         if (update_lft) {
2285                                 ifp->valid_lft = valid_lft;
2286                                 ifp->prefered_lft = prefered_lft;
2287                                 ifp->tstamp = now;
2288                                 flags = ifp->flags;
2289                                 ifp->flags &= ~IFA_F_DEPRECATED;
2290                                 spin_unlock(&ifp->lock);
2291 
2292                                 if (!(flags&IFA_F_TENTATIVE))
2293                                         ipv6_ifa_notify(0, ifp);
2294                         } else
2295                                 spin_unlock(&ifp->lock);
2296 
2297 #ifdef CONFIG_IPV6_PRIVACY
2298                         read_lock_bh(&in6_dev->lock);
2299                         /* update all temporary addresses in the list */
2300                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
2301                                             tmp_list) {
2302                                 int age, max_valid, max_prefered;
2303 
2304                                 if (ifp != ift->ifpub)
2305                                         continue;
2306 
2307                                 /*
2308                                  * RFC 4941 section 3.3:
2309                                  * If a received option will extend the lifetime
2310                                  * of a public address, the lifetimes of
2311                                  * temporary addresses should be extended,
2312                                  * subject to the overall constraint that no
2313                                  * temporary addresses should ever remain
2314                                  * "valid" or "preferred" for a time longer than
2315                                  * (TEMP_VALID_LIFETIME) or
2316                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2317                                  * respectively.
2318                                  */
2319                                 age = (now - ift->cstamp) / HZ;
2320                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2321                                 if (max_valid < 0)
2322                                         max_valid = 0;
2323 
2324                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2325                                                in6_dev->cnf.max_desync_factor -
2326                                                age;
2327                                 if (max_prefered < 0)
2328                                         max_prefered = 0;
2329 
2330                                 if (valid_lft > max_valid)
2331                                         valid_lft = max_valid;
2332 
2333                                 if (prefered_lft > max_prefered)
2334                                         prefered_lft = max_prefered;
2335 
2336                                 spin_lock(&ift->lock);
2337                                 flags = ift->flags;
2338                                 ift->valid_lft = valid_lft;
2339                                 ift->prefered_lft = prefered_lft;
2340                                 ift->tstamp = now;
2341                                 if (prefered_lft > 0)
2342                                         ift->flags &= ~IFA_F_DEPRECATED;
2343 
2344                                 spin_unlock(&ift->lock);
2345                                 if (!(flags&IFA_F_TENTATIVE))
2346                                         ipv6_ifa_notify(0, ift);
2347                         }
2348 
2349                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2350                                 /*
2351                                  * When a new public address is created as
2352                                  * described in [ADDRCONF], also create a new
2353                                  * temporary address. Also create a temporary
2354                                  * address if it's enabled but no temporary
2355                                  * address currently exists.
2356                                  */
2357                                 read_unlock_bh(&in6_dev->lock);
2358                                 ipv6_create_tempaddr(ifp, NULL);
2359                         } else {
2360                                 read_unlock_bh(&in6_dev->lock);
2361                         }
2362 #endif
2363                         in6_ifa_put(ifp);
2364                         addrconf_verify(0);
2365                 }
2366         }
2367         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2368         in6_dev_put(in6_dev);
2369 }
2370 
2371 /*
2372  *      Set destination address.
2373  *      Special case for SIT interfaces where we create a new "virtual"
2374  *      device.
2375  */
2376 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2377 {
2378         struct in6_ifreq ireq;
2379         struct net_device *dev;
2380         int err = -EINVAL;
2381 
2382         rtnl_lock();
2383 
2384         err = -EFAULT;
2385         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2386                 goto err_exit;
2387 
2388         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2389 
2390         err = -ENODEV;
2391         if (dev == NULL)
2392                 goto err_exit;
2393 
2394 #if IS_ENABLED(CONFIG_IPV6_SIT)
2395         if (dev->type == ARPHRD_SIT) {
2396                 const struct net_device_ops *ops = dev->netdev_ops;
2397                 struct ifreq ifr;
2398                 struct ip_tunnel_parm p;
2399 
2400                 err = -EADDRNOTAVAIL;
2401                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2402                         goto err_exit;
2403 
2404                 memset(&p, 0, sizeof(p));
2405                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2406                 p.iph.saddr = 0;
2407                 p.iph.version = 4;
2408                 p.iph.ihl = 5;
2409                 p.iph.protocol = IPPROTO_IPV6;
2410                 p.iph.ttl = 64;
2411                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2412 
2413                 if (ops->ndo_do_ioctl) {
2414                         mm_segment_t oldfs = get_fs();
2415 
2416                         set_fs(KERNEL_DS);
2417                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2418                         set_fs(oldfs);
2419                 } else
2420                         err = -EOPNOTSUPP;
2421 
2422                 if (err == 0) {
2423                         err = -ENOBUFS;
2424                         dev = __dev_get_by_name(net, p.name);
2425                         if (!dev)
2426                                 goto err_exit;
2427                         err = dev_open(dev);
2428                 }
2429         }
2430 #endif
2431 
2432 err_exit:
2433         rtnl_unlock();
2434         return err;
2435 }
2436 
2437 /*
2438  *      Manual configuration of address on an interface
2439  */
2440 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2441                           const struct in6_addr *peer_pfx,
2442                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2443                           __u32 valid_lft)
2444 {
2445         struct inet6_ifaddr *ifp;
2446         struct inet6_dev *idev;
2447         struct net_device *dev;
2448         int scope;
2449         u32 flags;
2450         clock_t expires;
2451         unsigned long timeout;
2452 
2453         ASSERT_RTNL();
2454 
2455         if (plen > 128)
2456                 return -EINVAL;
2457 
2458         /* check the lifetime */
2459         if (!valid_lft || prefered_lft > valid_lft)
2460                 return -EINVAL;
2461 
2462         dev = __dev_get_by_index(net, ifindex);
2463         if (!dev)
2464                 return -ENODEV;
2465 
2466         idev = addrconf_add_dev(dev);
2467         if (IS_ERR(idev))
2468                 return PTR_ERR(idev);
2469 
2470         scope = ipv6_addr_scope(pfx);
2471 
2472         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2473         if (addrconf_finite_timeout(timeout)) {
2474                 expires = jiffies_to_clock_t(timeout * HZ);
2475                 valid_lft = timeout;
2476                 flags = RTF_EXPIRES;
2477         } else {
2478                 expires = 0;
2479                 flags = 0;
2480                 ifa_flags |= IFA_F_PERMANENT;
2481         }
2482 
2483         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2484         if (addrconf_finite_timeout(timeout)) {
2485                 if (timeout == 0)
2486                         ifa_flags |= IFA_F_DEPRECATED;
2487                 prefered_lft = timeout;
2488         }
2489 
2490         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2491                             valid_lft, prefered_lft);
2492 
2493         if (!IS_ERR(ifp)) {
2494                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2495                                       expires, flags);
2496                 /*
2497                  * Note that section 3.1 of RFC 4429 indicates
2498                  * that the Optimistic flag should not be set for
2499                  * manually configured addresses
2500                  */
2501                 addrconf_dad_start(ifp);
2502                 in6_ifa_put(ifp);
2503                 addrconf_verify(0);
2504                 return 0;
2505         }
2506 
2507         return PTR_ERR(ifp);
2508 }
2509 
2510 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2511                           unsigned int plen)
2512 {
2513         struct inet6_ifaddr *ifp;
2514         struct inet6_dev *idev;
2515         struct net_device *dev;
2516 
2517         if (plen > 128)
2518                 return -EINVAL;
2519 
2520         dev = __dev_get_by_index(net, ifindex);
2521         if (!dev)
2522                 return -ENODEV;
2523 
2524         if ((idev = __in6_dev_get(dev)) == NULL)
2525                 return -ENXIO;
2526 
2527         read_lock_bh(&idev->lock);
2528         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2529                 if (ifp->prefix_len == plen &&
2530                     ipv6_addr_equal(pfx, &ifp->addr)) {
2531                         in6_ifa_hold(ifp);
2532                         read_unlock_bh(&idev->lock);
2533 
2534                         ipv6_del_addr(ifp);
2535                         return 0;
2536                 }
2537         }
2538         read_unlock_bh(&idev->lock);
2539         return -EADDRNOTAVAIL;
2540 }
2541 
2542 
2543 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2544 {
2545         struct in6_ifreq ireq;
2546         int err;
2547 
2548         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2549                 return -EPERM;
2550 
2551         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2552                 return -EFAULT;
2553 
2554         rtnl_lock();
2555         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2556                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2557                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2558         rtnl_unlock();
2559         return err;
2560 }
2561 
2562 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2563 {
2564         struct in6_ifreq ireq;
2565         int err;
2566 
2567         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2568                 return -EPERM;
2569 
2570         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2571                 return -EFAULT;
2572 
2573         rtnl_lock();
2574         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2575                              ireq.ifr6_prefixlen);
2576         rtnl_unlock();
2577         return err;
2578 }
2579 
2580 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2581                      int plen, int scope)
2582 {
2583         struct inet6_ifaddr *ifp;
2584 
2585         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2586                             scope, IFA_F_PERMANENT, 0, 0);
2587         if (!IS_ERR(ifp)) {
2588                 spin_lock_bh(&ifp->lock);
2589                 ifp->flags &= ~IFA_F_TENTATIVE;
2590                 spin_unlock_bh(&ifp->lock);
2591                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2592                 in6_ifa_put(ifp);
2593         }
2594 }
2595 
2596 #if IS_ENABLED(CONFIG_IPV6_SIT)
2597 static void sit_add_v4_addrs(struct inet6_dev *idev)
2598 {
2599         struct in6_addr addr;
2600         struct net_device *dev;
2601         struct net *net = dev_net(idev->dev);
2602         int scope;
2603 
2604         ASSERT_RTNL();
2605 
2606         memset(&addr, 0, sizeof(struct in6_addr));
2607         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2608 
2609         if (idev->dev->flags&IFF_POINTOPOINT) {
2610                 addr.s6_addr32[0] = htonl(0xfe800000);
2611                 scope = IFA_LINK;
2612         } else {
2613                 scope = IPV6_ADDR_COMPATv4;
2614         }
2615 
2616         if (addr.s6_addr32[3]) {
2617                 add_addr(idev, &addr, 128, scope);
2618                 return;
2619         }
2620 
2621         for_each_netdev(net, dev) {
2622                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2623                 if (in_dev && (dev->flags & IFF_UP)) {
2624                         struct in_ifaddr *ifa;
2625 
2626                         int flag = scope;
2627 
2628                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2629                                 int plen;
2630 
2631                                 addr.s6_addr32[3] = ifa->ifa_local;
2632 
2633                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2634                                         continue;
2635                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2636                                         if (idev->dev->flags&IFF_POINTOPOINT)
2637                                                 continue;
2638                                         flag |= IFA_HOST;
2639                                 }
2640                                 if (idev->dev->flags&IFF_POINTOPOINT)
2641                                         plen = 64;
2642                                 else
2643                                         plen = 96;
2644 
2645                                 add_addr(idev, &addr, plen, flag);
2646                         }
2647                 }
2648         }
2649 }
2650 #endif
2651 
2652 static void init_loopback(struct net_device *dev)
2653 {
2654         struct inet6_dev  *idev;
2655         struct net_device *sp_dev;
2656         struct inet6_ifaddr *sp_ifa;
2657         struct rt6_info *sp_rt;
2658 
2659         /* ::1 */
2660 
2661         ASSERT_RTNL();
2662 
2663         if ((idev = ipv6_find_idev(dev)) == NULL) {
2664                 pr_debug("%s: add_dev failed\n", __func__);
2665                 return;
2666         }
2667 
2668         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2669 
2670         /* Add routes to other interface's IPv6 addresses */
2671         for_each_netdev(dev_net(dev), sp_dev) {
2672                 if (!strcmp(sp_dev->name, dev->name))
2673                         continue;
2674 
2675                 idev = __in6_dev_get(sp_dev);
2676                 if (!idev)
2677                         continue;
2678 
2679                 read_lock_bh(&idev->lock);
2680                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2681 
2682                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2683                                 continue;
2684 
2685                         if (sp_ifa->rt)
2686                                 continue;
2687 
2688                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2689 
2690                         /* Failure cases are ignored */
2691                         if (!IS_ERR(sp_rt)) {
2692                                 sp_ifa->rt = sp_rt;
2693                                 ip6_ins_rt(sp_rt);
2694                         }
2695                 }
2696                 read_unlock_bh(&idev->lock);
2697         }
2698 }
2699 
2700 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2701 {
2702         struct inet6_ifaddr *ifp;
2703         u32 addr_flags = IFA_F_PERMANENT;
2704 
2705 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2706         if (idev->cnf.optimistic_dad &&
2707             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2708                 addr_flags |= IFA_F_OPTIMISTIC;
2709 #endif
2710 
2711 
2712         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2713         if (!IS_ERR(ifp)) {
2714                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2715                 addrconf_dad_start(ifp);
2716                 in6_ifa_put(ifp);
2717         }
2718 }
2719 
2720 static void addrconf_dev_config(struct net_device *dev)
2721 {
2722         struct in6_addr addr;
2723         struct inet6_dev *idev;
2724 
2725         ASSERT_RTNL();
2726 
2727         if ((dev->type != ARPHRD_ETHER) &&
2728             (dev->type != ARPHRD_FDDI) &&
2729             (dev->type != ARPHRD_ARCNET) &&
2730             (dev->type != ARPHRD_INFINIBAND) &&
2731             (dev->type != ARPHRD_IEEE802154) &&
2732             (dev->type != ARPHRD_IEEE1394)) {
2733                 /* Alas, we support only Ethernet autoconfiguration. */
2734                 return;
2735         }
2736 
2737         idev = addrconf_add_dev(dev);
2738         if (IS_ERR(idev))
2739                 return;
2740 
2741         memset(&addr, 0, sizeof(struct in6_addr));
2742         addr.s6_addr32[0] = htonl(0xFE800000);
2743 
2744         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2745                 addrconf_add_linklocal(idev, &addr);
2746 }
2747 
2748 #if IS_ENABLED(CONFIG_IPV6_SIT)
2749 static void addrconf_sit_config(struct net_device *dev)
2750 {
2751         struct inet6_dev *idev;
2752 
2753         ASSERT_RTNL();
2754 
2755         /*
2756          * Configure the tunnel with one of our IPv4
2757          * addresses... we should configure all of
2758          * our v4 addrs in the tunnel
2759          */
2760 
2761         if ((idev = ipv6_find_idev(dev)) == NULL) {
2762                 pr_debug("%s: add_dev failed\n", __func__);
2763                 return;
2764         }
2765 
2766         if (dev->priv_flags & IFF_ISATAP) {
2767                 struct in6_addr addr;
2768 
2769                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2770                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2771                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2772                         addrconf_add_linklocal(idev, &addr);
2773                 return;
2774         }
2775 
2776         sit_add_v4_addrs(idev);
2777 
2778         if (dev->flags&IFF_POINTOPOINT)
2779                 addrconf_add_mroute(dev);
2780         else
2781                 sit_route_add(dev);
2782 }
2783 #endif
2784 
2785 #if IS_ENABLED(CONFIG_NET_IPGRE)
2786 static void addrconf_gre_config(struct net_device *dev)
2787 {
2788         struct inet6_dev *idev;
2789         struct in6_addr addr;
2790 
2791         ASSERT_RTNL();
2792 
2793         if ((idev = ipv6_find_idev(dev)) == NULL) {
2794                 pr_debug("%s: add_dev failed\n", __func__);
2795                 return;
2796         }
2797 
2798         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2799         addrconf_prefix_route(&addr, 64, dev, 0, 0);
2800 
2801         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2802                 addrconf_add_linklocal(idev, &addr);
2803 }
2804 #endif
2805 
2806 static inline int
2807 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2808 {
2809         struct in6_addr lladdr;
2810 
2811         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2812                 addrconf_add_linklocal(idev, &lladdr);
2813                 return 0;
2814         }
2815         return -1;
2816 }
2817 
2818 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2819 {
2820         struct net_device *link_dev;
2821         struct net *net = dev_net(idev->dev);
2822 
2823         /* first try to inherit the link-local address from the link device */
2824         if (idev->dev->iflink &&
2825             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2826                 if (!ipv6_inherit_linklocal(idev, link_dev))
2827                         return;
2828         }
2829         /* then try to inherit it from any device */
2830         for_each_netdev(net, link_dev) {
2831                 if (!ipv6_inherit_linklocal(idev, link_dev))
2832                         return;
2833         }
2834         pr_debug("init ip6-ip6: add_linklocal failed\n");
2835 }
2836 
2837 /*
2838  * Autoconfigure tunnel with a link-local address so routing protocols,
2839  * DHCPv6, MLD etc. can be run over the virtual link
2840  */
2841 
2842 static void addrconf_ip6_tnl_config(struct net_device *dev)
2843 {
2844         struct inet6_dev *idev;
2845 
2846         ASSERT_RTNL();
2847 
2848         idev = addrconf_add_dev(dev);
2849         if (IS_ERR(idev)) {
2850                 pr_debug("init ip6-ip6: add_dev failed\n");
2851                 return;
2852         }
2853         ip6_tnl_add_linklocal(idev);
2854 }
2855 
2856 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2857                            void *ptr)
2858 {
2859         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2860         struct inet6_dev *idev = __in6_dev_get(dev);
2861         int run_pending = 0;
2862         int err;
2863 
2864         switch (event) {
2865         case NETDEV_REGISTER:
2866                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2867                         idev = ipv6_add_dev(dev);
2868                         if (!idev)
2869                                 return notifier_from_errno(-ENOMEM);
2870                 }
2871                 break;
2872 
2873         case NETDEV_UP:
2874         case NETDEV_CHANGE:
2875                 if (dev->flags & IFF_SLAVE)
2876                         break;
2877 
2878                 if (event == NETDEV_UP) {
2879                         if (!addrconf_qdisc_ok(dev)) {
2880                                 /* device is not ready yet. */
2881                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2882                                         dev->name);
2883                                 break;
2884                         }
2885 
2886                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2887                                 idev = ipv6_add_dev(dev);
2888 
2889                         if (idev) {
2890                                 idev->if_flags |= IF_READY;
2891                                 run_pending = 1;
2892                         }
2893                 } else {
2894                         if (!addrconf_qdisc_ok(dev)) {
2895                                 /* device is still not ready. */
2896                                 break;
2897                         }
2898 
2899                         if (idev) {
2900                                 if (idev->if_flags & IF_READY)
2901                                         /* device is already configured. */
2902                                         break;
2903                                 idev->if_flags |= IF_READY;
2904                         }
2905 
2906                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2907                                 dev->name);
2908 
2909                         run_pending = 1;
2910                 }
2911 
2912                 switch (dev->type) {
2913 #if IS_ENABLED(CONFIG_IPV6_SIT)
2914                 case ARPHRD_SIT:
2915                         addrconf_sit_config(dev);
2916                         break;
2917 #endif
2918 #if IS_ENABLED(CONFIG_NET_IPGRE)
2919                 case ARPHRD_IPGRE:
2920                         addrconf_gre_config(dev);
2921                         break;
2922 #endif
2923                 case ARPHRD_TUNNEL6:
2924                         addrconf_ip6_tnl_config(dev);
2925                         break;
2926                 case ARPHRD_LOOPBACK:
2927                         init_loopback(dev);
2928                         break;
2929 
2930                 default:
2931                         addrconf_dev_config(dev);
2932                         break;
2933                 }
2934 
2935                 if (idev) {
2936                         if (run_pending)
2937                                 addrconf_dad_run(idev);
2938 
2939                         /*
2940                          * If the MTU changed during the interface down,
2941                          * when the interface up, the changed MTU must be
2942                          * reflected in the idev as well as routers.
2943                          */
2944                         if (idev->cnf.mtu6 != dev->mtu &&
2945                             dev->mtu >= IPV6_MIN_MTU) {
2946                                 rt6_mtu_change(dev, dev->mtu);
2947                                 idev->cnf.mtu6 = dev->mtu;
2948                         }
2949                         idev->tstamp = jiffies;
2950                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2951 
2952                         /*
2953                          * If the changed mtu during down is lower than
2954                          * IPV6_MIN_MTU stop IPv6 on this interface.
2955                          */
2956                         if (dev->mtu < IPV6_MIN_MTU)
2957                                 addrconf_ifdown(dev, 1);
2958                 }
2959                 break;
2960 
2961         case NETDEV_CHANGEMTU:
2962                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2963                         rt6_mtu_change(dev, dev->mtu);
2964                         idev->cnf.mtu6 = dev->mtu;
2965                         break;
2966                 }
2967 
2968                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2969                         idev = ipv6_add_dev(dev);
2970                         if (idev)
2971                                 break;
2972                 }
2973 
2974                 /*
2975                  * MTU falled under IPV6_MIN_MTU.
2976                  * Stop IPv6 on this interface.
2977                  */
2978 
2979         case NETDEV_DOWN:
2980         case NETDEV_UNREGISTER:
2981                 /*
2982                  *      Remove all addresses from this interface.
2983                  */
2984                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2985                 break;
2986 
2987         case NETDEV_CHANGENAME:
2988                 if (idev) {
2989                         snmp6_unregister_dev(idev);
2990                         addrconf_sysctl_unregister(idev);
2991                         addrconf_sysctl_register(idev);
2992                         err = snmp6_register_dev(idev);
2993                         if (err)
2994                                 return notifier_from_errno(err);
2995                 }
2996                 break;
2997 
2998         case NETDEV_PRE_TYPE_CHANGE:
2999         case NETDEV_POST_TYPE_CHANGE:
3000                 addrconf_type_change(dev, event);
3001                 break;
3002         }
3003 
3004         return NOTIFY_OK;
3005 }
3006 
3007 /*
3008  *      addrconf module should be notified of a device going up
3009  */
3010 static struct notifier_block ipv6_dev_notf = {
3011         .notifier_call = addrconf_notify,
3012 };
3013 
3014 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3015 {
3016         struct inet6_dev *idev;
3017         ASSERT_RTNL();
3018 
3019         idev = __in6_dev_get(dev);
3020 
3021         if (event == NETDEV_POST_TYPE_CHANGE)
3022                 ipv6_mc_remap(idev);
3023         else if (event == NETDEV_PRE_TYPE_CHANGE)
3024                 ipv6_mc_unmap(idev);
3025 }
3026 
3027 static int addrconf_ifdown(struct net_device *dev, int how)
3028 {
3029         struct net *net = dev_net(dev);
3030         struct inet6_dev *idev;
3031         struct inet6_ifaddr *ifa;
3032         int state, i;
3033 
3034         ASSERT_RTNL();
3035 
3036         rt6_ifdown(net, dev);
3037         neigh_ifdown(&nd_tbl, dev);
3038 
3039         idev = __in6_dev_get(dev);
3040         if (idev == NULL)
3041                 return -ENODEV;
3042 
3043         /*
3044          * Step 1: remove reference to ipv6 device from parent device.
3045          *         Do not dev_put!
3046          */
3047         if (how) {
3048                 idev->dead = 1;
3049 
3050                 /* protected by rtnl_lock */
3051                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3052 
3053                 /* Step 1.5: remove snmp6 entry */
3054                 snmp6_unregister_dev(idev);
3055 
3056         }
3057 
3058         /* Step 2: clear hash table */
3059         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3060                 struct hlist_head *h = &inet6_addr_lst[i];
3061 
3062                 spin_lock_bh(&addrconf_hash_lock);
3063         restart:
3064                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3065                         if (ifa->idev == idev) {
3066                                 hlist_del_init_rcu(&ifa->addr_lst);
3067                                 addrconf_del_dad_timer(ifa);
3068                                 goto restart;
3069                         }
3070                 }
3071                 spin_unlock_bh(&addrconf_hash_lock);
3072         }
3073 
3074         write_lock_bh(&idev->lock);
3075 
3076         addrconf_del_rs_timer(idev);
3077 
3078         /* Step 2: clear flags for stateless addrconf */
3079         if (!how)
3080                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3081 
3082 #ifdef CONFIG_IPV6_PRIVACY
3083         if (how && del_timer(&idev->regen_timer))
3084                 in6_dev_put(idev);
3085 
3086         /* Step 3: clear tempaddr list */
3087         while (!list_empty(&idev->tempaddr_list)) {
3088                 ifa = list_first_entry(&idev->tempaddr_list,
3089                                        struct inet6_ifaddr, tmp_list);
3090                 list_del(&ifa->tmp_list);
3091                 write_unlock_bh(&idev->lock);
3092                 spin_lock_bh(&ifa->lock);
3093 
3094                 if (ifa->ifpub) {
3095                         in6_ifa_put(ifa->ifpub);
3096                         ifa->ifpub = NULL;
3097                 }
3098                 spin_unlock_bh(&ifa->lock);
3099                 in6_ifa_put(ifa);
3100                 write_lock_bh(&idev->lock);
3101         }
3102 #endif
3103 
3104         while (!list_empty(&idev->addr_list)) {
3105                 ifa = list_first_entry(&idev->addr_list,
3106                                        struct inet6_ifaddr, if_list);
3107                 addrconf_del_dad_timer(ifa);
3108 
3109                 list_del(&ifa->if_list);
3110 
3111                 write_unlock_bh(&idev->lock);
3112 
3113                 spin_lock_bh(&ifa->state_lock);
3114                 state = ifa->state;
3115                 ifa->state = INET6_IFADDR_STATE_DEAD;
3116                 spin_unlock_bh(&ifa->state_lock);
3117 
3118                 if (state != INET6_IFADDR_STATE_DEAD) {
3119                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3120                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3121                 }
3122                 in6_ifa_put(ifa);
3123 
3124                 write_lock_bh(&idev->lock);
3125         }
3126 
3127         write_unlock_bh(&idev->lock);
3128 
3129         /* Step 5: Discard multicast list */
3130         if (how)
3131                 ipv6_mc_destroy_dev(idev);
3132         else
3133                 ipv6_mc_down(idev);
3134 
3135         idev->tstamp = jiffies;
3136 
3137         /* Last: Shot the device (if unregistered) */
3138         if (how) {
3139                 addrconf_sysctl_unregister(idev);
3140                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3141                 neigh_ifdown(&nd_tbl, dev);
3142                 in6_dev_put(idev);
3143         }
3144         return 0;
3145 }
3146 
3147 static void addrconf_rs_timer(unsigned long data)
3148 {
3149         struct inet6_dev *idev = (struct inet6_dev *)data;
3150         struct in6_addr lladdr;
3151 
3152         write_lock(&idev->lock);
3153         if (idev->dead || !(idev->if_flags & IF_READY))
3154                 goto out;
3155 
3156         if (!ipv6_accept_ra(idev))
3157                 goto out;
3158 
3159         /* Announcement received after solicitation was sent */
3160         if (idev->if_flags & IF_RA_RCVD)
3161                 goto out;
3162 
3163         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3164                 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE))
3165                         ndisc_send_rs(idev->dev, &lladdr,
3166                                       &in6addr_linklocal_allrouters);
3167                 else
3168                         goto out;
3169 
3170                 /* The wait after the last probe can be shorter */
3171                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3172                                              idev->cnf.rtr_solicits) ?
3173                                       idev->cnf.rtr_solicit_delay :
3174                                       idev->cnf.rtr_solicit_interval);
3175         } else {
3176                 /*
3177                  * Note: we do not support deprecated "all on-link"
3178                  * assumption any longer.
3179                  */
3180                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3181         }
3182 
3183 out:
3184         write_unlock(&idev->lock);
3185         in6_dev_put(idev);
3186 }
3187 
3188 /*
3189  *      Duplicate Address Detection
3190  */
3191 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3192 {
3193         unsigned long rand_num;
3194         struct inet6_dev *idev = ifp->idev;
3195 
3196         if (ifp->flags & IFA_F_OPTIMISTIC)
3197                 rand_num = 0;
3198         else
3199                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3200 
3201         ifp->dad_probes = idev->cnf.dad_transmits;
3202         addrconf_mod_dad_timer(ifp, rand_num);
3203 }
3204 
3205 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3206 {
3207         struct inet6_dev *idev = ifp->idev;
3208         struct net_device *dev = idev->dev;
3209 
3210         addrconf_join_solict(dev, &ifp->addr);
3211 
3212         net_srandom(ifp->addr.s6_addr32[3]);
3213 
3214         read_lock_bh(&idev->lock);
3215         spin_lock(&ifp->lock);
3216         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3217                 goto out;
3218 
3219         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3220             idev->cnf.accept_dad < 1 ||
3221             !(ifp->flags&IFA_F_TENTATIVE) ||
3222             ifp->flags & IFA_F_NODAD) {
3223                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3224                 spin_unlock(&ifp->lock);
3225                 read_unlock_bh(&idev->lock);
3226 
3227                 addrconf_dad_completed(ifp);
3228                 return;
3229         }
3230 
3231         if (!(idev->if_flags & IF_READY)) {
3232                 spin_unlock(&ifp->lock);
3233                 read_unlock_bh(&idev->lock);
3234                 /*
3235                  * If the device is not ready:
3236                  * - keep it tentative if it is a permanent address.
3237                  * - otherwise, kill it.
3238                  */
3239                 in6_ifa_hold(ifp);
3240                 addrconf_dad_stop(ifp, 0);
3241                 return;
3242         }
3243 
3244         /*
3245          * Optimistic nodes can start receiving
3246          * Frames right away
3247          */
3248         if (ifp->flags & IFA_F_OPTIMISTIC)
3249                 ip6_ins_rt(ifp->rt);
3250 
3251         addrconf_dad_kick(ifp);
3252 out:
3253         spin_unlock(&ifp->lock);
3254         read_unlock_bh(&idev->lock);
3255 }
3256 
3257 static void addrconf_dad_timer(unsigned long data)
3258 {
3259         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3260         struct inet6_dev *idev = ifp->idev;
3261         struct in6_addr mcaddr;
3262 
3263         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3264                 goto out;
3265 
3266         write_lock(&idev->lock);
3267         if (idev->dead || !(idev->if_flags & IF_READY)) {
3268                 write_unlock(&idev->lock);
3269                 goto out;
3270         }
3271 
3272         spin_lock(&ifp->lock);
3273         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3274                 spin_unlock(&ifp->lock);
3275                 write_unlock(&idev->lock);
3276                 goto out;
3277         }
3278 
3279         if (ifp->dad_probes == 0) {
3280                 /*
3281                  * DAD was successful
3282                  */
3283 
3284                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3285                 spin_unlock(&ifp->lock);
3286                 write_unlock(&idev->lock);
3287 
3288                 addrconf_dad_completed(ifp);
3289 
3290                 goto out;
3291         }
3292 
3293         ifp->dad_probes--;
3294         addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3295         spin_unlock(&ifp->lock);
3296         write_unlock(&idev->lock);
3297 
3298         /* send a neighbour solicitation for our addr */
3299         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3300         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3301 out:
3302         in6_ifa_put(ifp);
3303 }
3304 
3305 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3306 {
3307         struct net_device *dev = ifp->idev->dev;
3308         struct in6_addr lladdr;
3309         bool send_rs, send_mld;
3310 
3311         addrconf_del_dad_timer(ifp);
3312 
3313         /*
3314          *      Configure the address for reception. Now it is valid.
3315          */
3316 
3317         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3318 
3319         /* If added prefix is link local and we are prepared to process
3320            router advertisements, start sending router solicitations.
3321          */
3322 
3323         read_lock_bh(&ifp->idev->lock);
3324         spin_lock(&ifp->lock);
3325         send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3326                    ifp->idev->valid_ll_addr_cnt == 1;
3327         send_rs = send_mld &&
3328                   ipv6_accept_ra(ifp->idev) &&
3329                   ifp->idev->cnf.rtr_solicits > 0 &&
3330                   (dev->flags&IFF_LOOPBACK) == 0;
3331         spin_unlock(&ifp->lock);
3332         read_unlock_bh(&ifp->idev->lock);
3333 
3334         /* While dad is in progress mld report's source address is in6_addrany.
3335          * Resend with proper ll now.
3336          */
3337         if (send_mld)
3338                 ipv6_mc_dad_complete(ifp->idev);
3339 
3340         if (send_rs) {
3341                 /*
3342                  *      If a host as already performed a random delay
3343                  *      [...] as part of DAD [...] there is no need
3344                  *      to delay again before sending the first RS
3345                  */
3346                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3347                         return;
3348                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3349 
3350                 write_lock_bh(&ifp->idev->lock);
3351                 spin_lock(&ifp->lock);
3352                 ifp->idev->rs_probes = 1;
3353                 ifp->idev->if_flags |= IF_RS_SENT;
3354                 addrconf_mod_rs_timer(ifp->idev,
3355                                       ifp->idev->cnf.rtr_solicit_interval);
3356                 spin_unlock(&ifp->lock);
3357                 write_unlock_bh(&ifp->idev->lock);
3358         }
3359 }
3360 
3361 static void addrconf_dad_run(struct inet6_dev *idev)
3362 {
3363         struct inet6_ifaddr *ifp;
3364 
3365         read_lock_bh(&idev->lock);
3366         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3367                 spin_lock(&ifp->lock);
3368                 if (ifp->flags & IFA_F_TENTATIVE &&
3369                     ifp->state == INET6_IFADDR_STATE_DAD)
3370                         addrconf_dad_kick(ifp);
3371                 spin_unlock(&ifp->lock);
3372         }
3373         read_unlock_bh(&idev->lock);
3374 }
3375 
3376 #ifdef CONFIG_PROC_FS
3377 struct if6_iter_state {
3378         struct seq_net_private p;
3379         int bucket;
3380         int offset;
3381 };
3382 
3383 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3384 {
3385         struct inet6_ifaddr *ifa = NULL;
3386         struct if6_iter_state *state = seq->private;
3387         struct net *net = seq_file_net(seq);
3388         int p = 0;
3389 
3390         /* initial bucket if pos is 0 */
3391         if (pos == 0) {
3392                 state->bucket = 0;
3393                 state->offset = 0;
3394         }
3395 
3396         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3397                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3398                                          addr_lst) {
3399                         if (!net_eq(dev_net(ifa->idev->dev), net))
3400                                 continue;
3401                         /* sync with offset */
3402                         if (p < state->offset) {
3403                                 p++;
3404                                 continue;
3405                         }
3406                         state->offset++;
3407                         return ifa;
3408                 }
3409 
3410                 /* prepare for next bucket */
3411                 state->offset = 0;
3412                 p = 0;
3413         }
3414         return NULL;
3415 }
3416 
3417 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3418                                          struct inet6_ifaddr *ifa)
3419 {
3420         struct if6_iter_state *state = seq->private;
3421         struct net *net = seq_file_net(seq);
3422 
3423         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3424                 if (!net_eq(dev_net(ifa->idev->dev), net))
3425                         continue;
3426                 state->offset++;
3427                 return ifa;
3428         }
3429 
3430         while (++state->bucket < IN6_ADDR_HSIZE) {
3431                 state->offset = 0;
3432                 hlist_for_each_entry_rcu_bh(ifa,
3433                                      &inet6_addr_lst[state->bucket], addr_lst) {
3434                         if (!net_eq(dev_net(ifa->idev->dev), net))
3435                                 continue;
3436                         state->offset++;
3437                         return ifa;
3438                 }
3439         }
3440 
3441         return NULL;
3442 }
3443 
3444 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3445         __acquires(rcu_bh)
3446 {
3447         rcu_read_lock_bh();
3448         return if6_get_first(seq, *pos);
3449 }
3450 
3451 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3452 {
3453         struct inet6_ifaddr *ifa;
3454 
3455         ifa = if6_get_next(seq, v);
3456         ++*pos;
3457         return ifa;
3458 }
3459 
3460 static void if6_seq_stop(struct seq_file *seq, void *v)
3461         __releases(rcu_bh)
3462 {
3463         rcu_read_unlock_bh();
3464 }
3465 
3466 static int if6_seq_show(struct seq_file *seq, void *v)
3467 {
3468         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3469         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3470                    &ifp->addr,
3471                    ifp->idev->dev->ifindex,
3472                    ifp->prefix_len,
3473                    ifp->scope,
3474                    ifp->flags,
3475                    ifp->idev->dev->name);
3476         return 0;
3477 }
3478 
3479 static const struct seq_operations if6_seq_ops = {
3480         .start  = if6_seq_start,
3481         .next   = if6_seq_next,
3482         .show   = if6_seq_show,
3483         .stop   = if6_seq_stop,
3484 };
3485 
3486 static int if6_seq_open(struct inode *inode, struct file *file)
3487 {
3488         return seq_open_net(inode, file, &if6_seq_ops,
3489                             sizeof(struct if6_iter_state));
3490 }
3491 
3492 static const struct file_operations if6_fops = {
3493         .owner          = THIS_MODULE,
3494         .open           = if6_seq_open,
3495         .read           = seq_read,
3496         .llseek         = seq_lseek,
3497         .release        = seq_release_net,
3498 };
3499 
3500 static int __net_init if6_proc_net_init(struct net *net)
3501 {
3502         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3503                 return -ENOMEM;
3504         return 0;
3505 }
3506 
3507 static void __net_exit if6_proc_net_exit(struct net *net)
3508 {
3509         remove_proc_entry("if_inet6", net->proc_net);
3510 }
3511 
3512 static struct pernet_operations if6_proc_net_ops = {
3513        .init = if6_proc_net_init,
3514        .exit = if6_proc_net_exit,
3515 };
3516 
3517 int __init if6_proc_init(void)
3518 {
3519         return register_pernet_subsys(&if6_proc_net_ops);
3520 }
3521 
3522 void if6_proc_exit(void)
3523 {
3524         unregister_pernet_subsys(&if6_proc_net_ops);
3525 }
3526 #endif  /* CONFIG_PROC_FS */
3527 
3528 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3529 /* Check if address is a home address configured on any interface. */
3530 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3531 {
3532         int ret = 0;
3533         struct inet6_ifaddr *ifp = NULL;
3534         unsigned int hash = inet6_addr_hash(addr);
3535 
3536         rcu_read_lock_bh();
3537         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3538                 if (!net_eq(dev_net(ifp->idev->dev), net))
3539                         continue;
3540                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3541                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3542                         ret = 1;
3543                         break;
3544                 }
3545         }
3546         rcu_read_unlock_bh();
3547         return ret;
3548 }
3549 #endif
3550 
3551 /*
3552  *      Periodic address status verification
3553  */
3554 
3555 static void addrconf_verify(unsigned long foo)
3556 {
3557         unsigned long now, next, next_sec, next_sched;
3558         struct inet6_ifaddr *ifp;
3559         int i;
3560 
3561         rcu_read_lock_bh();
3562         spin_lock(&addrconf_verify_lock);
3563         now = jiffies;
3564         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3565 
3566         del_timer(&addr_chk_timer);
3567 
3568         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3569 restart:
3570                 hlist_for_each_entry_rcu_bh(ifp,
3571                                          &inet6_addr_lst[i], addr_lst) {
3572                         unsigned long age;
3573 
3574                         if (ifp->flags & IFA_F_PERMANENT)
3575                                 continue;
3576 
3577                         spin_lock(&ifp->lock);
3578                         /* We try to batch several events at once. */
3579                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3580 
3581                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3582                             age >= ifp->valid_lft) {
3583                                 spin_unlock(&ifp->lock);
3584                                 in6_ifa_hold(ifp);
3585                                 ipv6_del_addr(ifp);
3586                                 goto restart;
3587                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3588                                 spin_unlock(&ifp->lock);
3589                                 continue;
3590                         } else if (age >= ifp->prefered_lft) {
3591                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3592                                 int deprecate = 0;
3593 
3594                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3595                                         deprecate = 1;
3596                                         ifp->flags |= IFA_F_DEPRECATED;
3597                                 }
3598 
3599                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3600                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3601 
3602                                 spin_unlock(&ifp->lock);
3603 
3604                                 if (deprecate) {
3605                                         in6_ifa_hold(ifp);
3606 
3607                                         ipv6_ifa_notify(0, ifp);
3608                                         in6_ifa_put(ifp);
3609                                         goto restart;
3610                                 }
3611 #ifdef CONFIG_IPV6_PRIVACY
3612                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3613                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3614                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3615                                         ifp->idev->cnf.dad_transmits *
3616                                         ifp->idev->nd_parms->retrans_time / HZ;
3617 
3618                                 if (age >= ifp->prefered_lft - regen_advance) {
3619                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3620                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3621                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3622                                         if (!ifp->regen_count && ifpub) {
3623                                                 ifp->regen_count++;
3624                                                 in6_ifa_hold(ifp);
3625                                                 in6_ifa_hold(ifpub);
3626                                                 spin_unlock(&ifp->lock);
3627 
3628                                                 spin_lock(&ifpub->lock);
3629                                                 ifpub->regen_count = 0;
3630                                                 spin_unlock(&ifpub->lock);
3631                                                 ipv6_create_tempaddr(ifpub, ifp);
3632                                                 in6_ifa_put(ifpub);
3633                                                 in6_ifa_put(ifp);
3634                                                 goto restart;
3635                                         }
3636                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3637                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3638                                 spin_unlock(&ifp->lock);
3639 #endif
3640                         } else {
3641                                 /* ifp->prefered_lft <= ifp->valid_lft */
3642                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3643                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3644                                 spin_unlock(&ifp->lock);
3645                         }
3646                 }
3647         }
3648 
3649         next_sec = round_jiffies_up(next);
3650         next_sched = next;
3651 
3652         /* If rounded timeout is accurate enough, accept it. */
3653         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3654                 next_sched = next_sec;
3655 
3656         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3657         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3658                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3659 
3660         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3661               now, next, next_sec, next_sched));
3662 
3663         addr_chk_timer.expires = next_sched;
3664         add_timer(&addr_chk_timer);
3665         spin_unlock(&addrconf_verify_lock);
3666         rcu_read_unlock_bh();
3667 }
3668 
3669 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3670                                      struct in6_addr **peer_pfx)
3671 {
3672         struct in6_addr *pfx = NULL;
3673 
3674         *peer_pfx = NULL;
3675 
3676         if (addr)
3677                 pfx = nla_data(addr);
3678 
3679         if (local) {
3680                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3681                         *peer_pfx = pfx;
3682                 pfx = nla_data(local);
3683         }
3684 
3685         return pfx;
3686 }
3687 
3688 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3689         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3690         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3691         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3692 };
3693 
3694 static int
3695 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3696 {
3697         struct net *net = sock_net(skb->sk);
3698         struct ifaddrmsg *ifm;
3699         struct nlattr *tb[IFA_MAX+1];
3700         struct in6_addr *pfx, *peer_pfx;
3701         int err;
3702 
3703         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3704         if (err < 0)
3705                 return err;
3706 
3707         ifm = nlmsg_data(nlh);
3708         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3709         if (pfx == NULL)
3710                 return -EINVAL;
3711 
3712         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3713 }
3714 
3715 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3716                              u32 prefered_lft, u32 valid_lft)
3717 {
3718         u32 flags;
3719         clock_t expires;
3720         unsigned long timeout;
3721 
3722         if (!valid_lft || (prefered_lft > valid_lft))
3723                 return -EINVAL;
3724 
3725         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3726         if (addrconf_finite_timeout(timeout)) {
3727                 expires = jiffies_to_clock_t(timeout * HZ);
3728                 valid_lft = timeout;
3729                 flags = RTF_EXPIRES;
3730         } else {
3731                 expires = 0;
3732                 flags = 0;
3733                 ifa_flags |= IFA_F_PERMANENT;
3734         }
3735 
3736         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3737         if (addrconf_finite_timeout(timeout)) {
3738                 if (timeout == 0)
3739                         ifa_flags |= IFA_F_DEPRECATED;
3740                 prefered_lft = timeout;
3741         }
3742 
3743         spin_lock_bh(&ifp->lock);
3744         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3745         ifp->tstamp = jiffies;
3746         ifp->valid_lft = valid_lft;
3747         ifp->prefered_lft = prefered_lft;
3748 
3749         spin_unlock_bh(&ifp->lock);
3750         if (!(ifp->flags&IFA_F_TENTATIVE))
3751                 ipv6_ifa_notify(0, ifp);
3752 
3753         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3754                               expires, flags);
3755         addrconf_verify(0);
3756 
3757         return 0;
3758 }
3759 
3760 static int
3761 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3762 {
3763         struct net *net = sock_net(skb->sk);
3764         struct ifaddrmsg *ifm;
3765         struct nlattr *tb[IFA_MAX+1];
3766         struct in6_addr *pfx, *peer_pfx;
3767         struct inet6_ifaddr *ifa;
3768         struct net_device *dev;
3769         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3770         u8 ifa_flags;
3771         int err;
3772 
3773         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3774         if (err < 0)
3775                 return err;
3776 
3777         ifm = nlmsg_data(nlh);
3778         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3779         if (pfx == NULL)
3780                 return -EINVAL;
3781 
3782         if (tb[IFA_CACHEINFO]) {
3783                 struct ifa_cacheinfo *ci;
3784 
3785                 ci = nla_data(tb[IFA_CACHEINFO]);
3786                 valid_lft = ci->ifa_valid;
3787                 preferred_lft = ci->ifa_prefered;
3788         } else {
3789                 preferred_lft = INFINITY_LIFE_TIME;
3790                 valid_lft = INFINITY_LIFE_TIME;
3791         }
3792 
3793         dev =  __dev_get_by_index(net, ifm->ifa_index);
3794         if (dev == NULL)
3795                 return -ENODEV;
3796 
3797         /* We ignore other flags so far. */
3798         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3799 
3800         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3801         if (ifa == NULL) {
3802                 /*
3803                  * It would be best to check for !NLM_F_CREATE here but
3804                  * userspace alreay relies on not having to provide this.
3805                  */
3806                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3807                                       ifm->ifa_prefixlen, ifa_flags,
3808                                       preferred_lft, valid_lft);
3809         }
3810 
3811         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3812             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3813                 err = -EEXIST;
3814         else
3815                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3816 
3817         in6_ifa_put(ifa);
3818 
3819         return err;
3820 }
3821 
3822 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3823                           u8 scope, int ifindex)
3824 {
3825         struct ifaddrmsg *ifm;
3826 
3827         ifm = nlmsg_data(nlh);
3828         ifm->ifa_family = AF_INET6;
3829         ifm->ifa_prefixlen = prefixlen;
3830         ifm->ifa_flags = flags;
3831         ifm->ifa_scope = scope;
3832         ifm->ifa_index = ifindex;
3833 }
3834 
3835 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3836                          unsigned long tstamp, u32 preferred, u32 valid)
3837 {
3838         struct ifa_cacheinfo ci;
3839 
3840         ci.cstamp = cstamp_delta(cstamp);
3841         ci.tstamp = cstamp_delta(tstamp);
3842         ci.ifa_prefered = preferred;
3843         ci.ifa_valid = valid;
3844 
3845         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3846 }
3847 
3848 static inline int rt_scope(int ifa_scope)
3849 {
3850         if (ifa_scope & IFA_HOST)
3851                 return RT_SCOPE_HOST;
3852         else if (ifa_scope & IFA_LINK)
3853                 return RT_SCOPE_LINK;
3854         else if (ifa_scope & IFA_SITE)
3855                 return RT_SCOPE_SITE;
3856         else
3857                 return RT_SCOPE_UNIVERSE;
3858 }
3859 
3860 static inline int inet6_ifaddr_msgsize(void)
3861 {
3862         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3863                + nla_total_size(16) /* IFA_LOCAL */
3864                + nla_total_size(16) /* IFA_ADDRESS */
3865                + nla_total_size(sizeof(struct ifa_cacheinfo));
3866 }
3867 
3868 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3869                              u32 portid, u32 seq, int event, unsigned int flags)
3870 {
3871         struct nlmsghdr  *nlh;
3872         u32 preferred, valid;
3873 
3874         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3875         if (nlh == NULL)
3876                 return -EMSGSIZE;
3877 
3878         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3879                       ifa->idev->dev->ifindex);
3880 
3881         if (!(ifa->flags&IFA_F_PERMANENT)) {
3882                 preferred = ifa->prefered_lft;
3883                 valid = ifa->valid_lft;
3884                 if (preferred != INFINITY_LIFE_TIME) {
3885                         long tval = (jiffies - ifa->tstamp)/HZ;
3886                         if (preferred > tval)
3887                                 preferred -= tval;
3888                         else
3889                                 preferred = 0;
3890                         if (valid != INFINITY_LIFE_TIME) {
3891                                 if (valid > tval)
3892                                         valid -= tval;
3893                                 else
3894                                         valid = 0;
3895                         }
3896                 }
3897         } else {
3898                 preferred = INFINITY_LIFE_TIME;
3899                 valid = INFINITY_LIFE_TIME;
3900         }
3901 
3902         if (!ipv6_addr_any(&ifa->peer_addr)) {
3903                 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3904                     nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3905                         goto error;
3906         } else
3907                 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3908                         goto error;
3909 
3910         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3911                 goto error;
3912 
3913         return nlmsg_end(skb, nlh);
3914 
3915 error:
3916         nlmsg_cancel(skb, nlh);
3917         return -EMSGSIZE;
3918 }
3919 
3920 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3921                                 u32 portid, u32 seq, int event, u16 flags)
3922 {
3923         struct nlmsghdr  *nlh;
3924         u8 scope = RT_SCOPE_UNIVERSE;
3925         int ifindex = ifmca->idev->dev->ifindex;
3926 
3927         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3928                 scope = RT_SCOPE_SITE;
3929 
3930         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3931         if (nlh == NULL)
3932                 return -EMSGSIZE;
3933 
3934         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3935         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3936             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3937                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3938                 nlmsg_cancel(skb, nlh);
3939                 return -EMSGSIZE;
3940         }
3941 
3942         return nlmsg_end(skb, nlh);
3943 }
3944 
3945 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3946                                 u32 portid, u32 seq, int event, unsigned int flags)
3947 {
3948         struct nlmsghdr  *nlh;
3949         u8 scope = RT_SCOPE_UNIVERSE;
3950         int ifindex = ifaca->aca_idev->dev->ifindex;
3951 
3952         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3953                 scope = RT_SCOPE_SITE;
3954 
3955         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3956         if (nlh == NULL)
3957                 return -EMSGSIZE;
3958 
3959         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3960         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3961             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3962                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3963                 nlmsg_cancel(skb, nlh);
3964                 return -EMSGSIZE;
3965         }
3966 
3967         return nlmsg_end(skb, nlh);
3968 }
3969 
3970 enum addr_type_t {
3971         UNICAST_ADDR,
3972         MULTICAST_ADDR,
3973         ANYCAST_ADDR,
3974 };
3975 
3976 /* called with rcu_read_lock() */
3977 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3978                           struct netlink_callback *cb, enum addr_type_t type,
3979                           int s_ip_idx, int *p_ip_idx)
3980 {
3981         struct ifmcaddr6 *ifmca;
3982         struct ifacaddr6 *ifaca;
3983         int err = 1;
3984         int ip_idx = *p_ip_idx;
3985 
3986         read_lock_bh(&idev->lock);
3987         switch (type) {
3988         case UNICAST_ADDR: {
3989                 struct inet6_ifaddr *ifa;
3990 
3991                 /* unicast address incl. temp addr */
3992                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3993                         if (++ip_idx < s_ip_idx)
3994                                 continue;
3995                         err = inet6_fill_ifaddr(skb, ifa,
3996                                                 NETLINK_CB(cb->skb).portid,
3997                                                 cb->nlh->nlmsg_seq,
3998                                                 RTM_NEWADDR,
3999                                                 NLM_F_MULTI);
4000                         if (err <= 0)
4001                                 break;
4002                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4003                 }
4004                 break;
4005         }
4006         case MULTICAST_ADDR:
4007                 /* multicast address */
4008                 for (ifmca = idev->mc_list; ifmca;
4009                      ifmca = ifmca->next, ip_idx++) {
4010                         if (ip_idx < s_ip_idx)
4011                                 continue;
4012                         err = inet6_fill_ifmcaddr(skb, ifmca,
4013                                                   NETLINK_CB(cb->skb).portid,
4014                                                   cb->nlh->nlmsg_seq,
4015                                                   RTM_GETMULTICAST,
4016                                                   NLM_F_MULTI);
4017                         if (err <= 0)
4018                                 break;
4019                 }
4020                 break;
4021         case ANYCAST_ADDR:
4022                 /* anycast address */
4023                 for (ifaca = idev->ac_list; ifaca;
4024                      ifaca = ifaca->aca_next, ip_idx++) {
4025                         if (ip_idx < s_ip_idx)
4026                                 continue;
4027                         err = inet6_fill_ifacaddr(skb, ifaca,
4028                                                   NETLINK_CB(cb->skb).portid,
4029                                                   cb->nlh->nlmsg_seq,
4030                                                   RTM_GETANYCAST,
4031                                                   NLM_F_MULTI);
4032                         if (err <= 0)
4033                                 break;
4034                 }
4035                 break;
4036         default:
4037                 break;
4038         }
4039         read_unlock_bh(&idev->lock);
4040         *p_ip_idx = ip_idx;
4041         return err;
4042 }
4043 
4044 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4045                            enum addr_type_t type)
4046 {
4047         struct net *net = sock_net(skb->sk);
4048         int h, s_h;
4049         int idx, ip_idx;
4050         int s_idx, s_ip_idx;
4051         struct net_device *dev;
4052         struct inet6_dev *idev;
4053         struct hlist_head *head;
4054 
4055         s_h = cb->args[0];
4056         s_idx = idx = cb->args[1];
4057         s_ip_idx = ip_idx = cb->args[2];
4058 
4059         rcu_read_lock();
4060         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4061         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4062                 idx = 0;
4063                 head = &net->dev_index_head[h];
4064                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4065                         if (idx < s_idx)
4066                                 goto cont;
4067                         if (h > s_h || idx > s_idx)
4068                                 s_ip_idx = 0;
4069                         ip_idx = 0;
4070                         idev = __in6_dev_get(dev);
4071                         if (!idev)
4072                                 goto cont;
4073 
4074                         if (in6_dump_addrs(idev, skb, cb, type,
4075                                            s_ip_idx, &ip_idx) <= 0)
4076                                 goto done;
4077 cont:
4078                         idx++;
4079                 }
4080         }
4081 done:
4082         rcu_read_unlock();
4083         cb->args[0] = h;
4084         cb->args[1] = idx;
4085         cb->args[2] = ip_idx;
4086 
4087         return skb->len;
4088 }
4089 
4090 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4091 {
4092         enum addr_type_t type = UNICAST_ADDR;
4093 
4094         return inet6_dump_addr(skb, cb, type);
4095 }
4096 
4097 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4098 {
4099         enum addr_type_t type = MULTICAST_ADDR;
4100 
4101         return inet6_dump_addr(skb, cb, type);
4102 }
4103 
4104 
4105 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4106 {
4107         enum addr_type_t type = ANYCAST_ADDR;
4108 
4109         return inet6_dump_addr(skb, cb, type);
4110 }
4111 
4112 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4113 {
4114         struct net *net = sock_net(in_skb->sk);
4115         struct ifaddrmsg *ifm;
4116         struct nlattr *tb[IFA_MAX+1];
4117         struct in6_addr *addr = NULL, *peer;
4118         struct net_device *dev = NULL;
4119         struct inet6_ifaddr *ifa;
4120         struct sk_buff *skb;
4121         int err;
4122 
4123         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4124         if (err < 0)
4125                 goto errout;
4126 
4127         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4128         if (addr == NULL) {
4129                 err = -EINVAL;
4130                 goto errout;
4131         }
4132 
4133         ifm = nlmsg_data(nlh);
4134         if (ifm->ifa_index)
4135                 dev = __dev_get_by_index(net, ifm->ifa_index);
4136 
4137         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4138         if (!ifa) {
4139                 err = -EADDRNOTAVAIL;
4140                 goto errout;
4141         }
4142 
4143         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4144         if (!skb) {
4145                 err = -ENOBUFS;
4146                 goto errout_ifa;
4147         }
4148 
4149         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4150                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4151         if (err < 0) {
4152                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4153                 WARN_ON(err == -EMSGSIZE);
4154                 kfree_skb(skb);
4155                 goto errout_ifa;
4156         }
4157         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4158 errout_ifa:
4159         in6_ifa_put(ifa);
4160 errout:
4161         return err;
4162 }
4163 
4164 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4165 {
4166         struct sk_buff *skb;
4167         struct net *net = dev_net(ifa->idev->dev);
4168         int err = -ENOBUFS;
4169 
4170         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4171         if (skb == NULL)
4172                 goto errout;
4173 
4174         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4175         if (err < 0) {
4176                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4177                 WARN_ON(err == -EMSGSIZE);
4178                 kfree_skb(skb);
4179                 goto errout;
4180         }
4181         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4182         return;
4183 errout:
4184         if (err < 0)
4185                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4186 }
4187 
4188 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4189                                 __s32 *array, int bytes)
4190 {
4191         BUG_ON(bytes < (DEVCONF_MAX * 4));
4192 
4193         memset(array, 0, bytes);
4194         array[DEVCONF_FORWARDING] = cnf->forwarding;
4195         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4196         array[DEVCONF_MTU6] = cnf->mtu6;
4197         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4198         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4199         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4200         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4201         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4202         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4203                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4204         array[DEVCONF_RTR_SOLICIT_DELAY] =
4205                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4206         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4207 #ifdef CONFIG_IPV6_PRIVACY
4208         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4209         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4210         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4211         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4212         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4213 #endif
4214         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4215         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4216         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4217 #ifdef CONFIG_IPV6_ROUTER_PREF
4218         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4219         array[DEVCONF_RTR_PROBE_INTERVAL] =
4220                 jiffies_to_msecs(cnf->rtr_probe_interval);
4221 #ifdef CONFIG_IPV6_ROUTE_INFO
4222         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4223 #endif
4224 #endif
4225         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4226         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4227 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4228         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4229 #endif
4230 #ifdef CONFIG_IPV6_MROUTE
4231         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4232 #endif
4233         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4234         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4235         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4236         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4237 }
4238 
4239 static inline size_t inet6_ifla6_size(void)
4240 {
4241         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4242              + nla_total_size(sizeof(struct ifla_cacheinfo))
4243              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4244              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4245              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4246              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4247 }
4248 
4249 static inline size_t inet6_if_nlmsg_size(void)
4250 {
4251         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4252                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4253                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4254                + nla_total_size(4) /* IFLA_MTU */
4255                + nla_total_size(4) /* IFLA_LINK */
4256                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4257 }
4258 
4259 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4260                                       int items, int bytes)
4261 {
4262         int i;
4263         int pad = bytes - sizeof(u64) * items;
4264         BUG_ON(pad < 0);
4265 
4266         /* Use put_unaligned() because stats may not be aligned for u64. */
4267         put_unaligned(items, &stats[0]);
4268         for (i = 1; i < items; i++)
4269                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4270 
4271         memset(&stats[items], 0, pad);
4272 }
4273 
4274 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4275                                       int items, int bytes, size_t syncpoff)
4276 {
4277         int i;
4278         int pad = bytes - sizeof(u64) * items;
4279         BUG_ON(pad < 0);
4280 
4281         /* Use put_unaligned() because stats may not be aligned for u64. */
4282         put_unaligned(items, &stats[0]);
4283         for (i = 1; i < items; i++)
4284                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4285 
4286         memset(&stats[items], 0, pad);
4287 }
4288 
4289 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4290                              int bytes)
4291 {
4292         switch (attrtype) {
4293         case IFLA_INET6_STATS:
4294                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4295                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4296                 break;
4297         case IFLA_INET6_ICMP6STATS:
4298                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4299                 break;
4300         }
4301 }
4302 
4303 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4304 {
4305         struct nlattr *nla;
4306         struct ifla_cacheinfo ci;
4307 
4308         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4309                 goto nla_put_failure;
4310         ci.max_reasm_len = IPV6_MAXPLEN;
4311         ci.tstamp = cstamp_delta(idev->tstamp);
4312         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4313         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4314         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4315                 goto nla_put_failure;
4316         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4317         if (nla == NULL)
4318                 goto nla_put_failure;
4319         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4320 
4321         /* XXX - MC not implemented */
4322 
4323         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4324         if (nla == NULL)
4325                 goto nla_put_failure;
4326         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4327 
4328         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4329         if (nla == NULL)
4330                 goto nla_put_failure;
4331         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4332 
4333         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4334         if (nla == NULL)
4335                 goto nla_put_failure;
4336         read_lock_bh(&idev->lock);
4337         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4338         read_unlock_bh(&idev->lock);
4339 
4340         return 0;
4341 
4342 nla_put_failure:
4343         return -EMSGSIZE;
4344 }
4345 
4346 static size_t inet6_get_link_af_size(const struct net_device *dev)
4347 {
4348         if (!__in6_dev_get(dev))
4349                 return 0;
4350 
4351         return inet6_ifla6_size();
4352 }
4353 
4354 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4355 {
4356         struct inet6_dev *idev = __in6_dev_get(dev);
4357 
4358         if (!idev)
4359                 return -ENODATA;
4360 
4361         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4362                 return -EMSGSIZE;
4363 
4364         return 0;
4365 }
4366 
4367 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4368 {
4369         struct inet6_ifaddr *ifp;
4370         struct net_device *dev = idev->dev;
4371         bool update_rs = false;
4372         struct in6_addr ll_addr;
4373 
4374         if (token == NULL)
4375                 return -EINVAL;
4376         if (ipv6_addr_any(token))
4377                 return -EINVAL;
4378         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4379                 return -EINVAL;
4380         if (!ipv6_accept_ra(idev))
4381                 return -EINVAL;
4382         if (idev->cnf.rtr_solicits <= 0)
4383                 return -EINVAL;
4384 
4385         write_lock_bh(&idev->lock);
4386 
4387         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4388         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4389 
4390         write_unlock_bh(&idev->lock);
4391 
4392         if (!idev->dead && (idev->if_flags & IF_READY) &&
4393             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4394                              IFA_F_OPTIMISTIC)) {
4395 
4396                 /* If we're not ready, then normal ifup will take care
4397                  * of this. Otherwise, we need to request our rs here.
4398                  */
4399                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4400                 update_rs = true;
4401         }
4402 
4403         write_lock_bh(&idev->lock);
4404 
4405         if (update_rs) {
4406                 idev->if_flags |= IF_RS_SENT;
4407                 idev->rs_probes = 1;
4408                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4409         }
4410 
4411         /* Well, that's kinda nasty ... */
4412         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4413                 spin_lock(&ifp->lock);
4414                 if (ifp->tokenized) {
4415                         ifp->valid_lft = 0;
4416                         ifp->prefered_lft = 0;
4417                 }
4418                 spin_unlock(&ifp->lock);
4419         }
4420 
4421         write_unlock_bh(&idev->lock);
4422         addrconf_verify(0);
4423         return 0;
4424 }
4425 
4426 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4427 {
4428         int err = -EINVAL;
4429         struct inet6_dev *idev = __in6_dev_get(dev);
4430         struct nlattr *tb[IFLA_INET6_MAX + 1];
4431 
4432         if (!idev)
4433                 return -EAFNOSUPPORT;
4434 
4435         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4436                 BUG();
4437 
4438         if (tb[IFLA_INET6_TOKEN])
4439                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4440 
4441         return err;
4442 }
4443 
4444 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4445                              u32 portid, u32 seq, int event, unsigned int flags)
4446 {
4447         struct net_device *dev = idev->dev;
4448         struct ifinfomsg *hdr;
4449         struct nlmsghdr *nlh;
4450         void *protoinfo;
4451 
4452         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4453         if (nlh == NULL)
4454                 return -EMSGSIZE;
4455 
4456         hdr = nlmsg_data(nlh);
4457         hdr->ifi_family = AF_INET6;
4458         hdr->__ifi_pad = 0;
4459         hdr->ifi_type = dev->type;
4460         hdr->ifi_index = dev->ifindex;
4461         hdr->ifi_flags = dev_get_flags(dev);
4462         hdr->ifi_change = 0;
4463 
4464         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4465             (dev->addr_len &&
4466              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4467             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4468             (dev->ifindex != dev->iflink &&
4469              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4470                 goto nla_put_failure;
4471         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4472         if (protoinfo == NULL)
4473                 goto nla_put_failure;
4474 
4475         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4476                 goto nla_put_failure;
4477 
4478         nla_nest_end(skb, protoinfo);
4479         return nlmsg_end(skb, nlh);
4480 
4481 nla_put_failure:
4482         nlmsg_cancel(skb, nlh);
4483         return -EMSGSIZE;
4484 }
4485 
4486 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4487 {
4488         struct net *net = sock_net(skb->sk);
4489         int h, s_h;
4490         int idx = 0, s_idx;
4491         struct net_device *dev;
4492         struct inet6_dev *idev;
4493         struct hlist_head *head;
4494 
4495         s_h = cb->args[0];
4496         s_idx = cb->args[1];
4497 
4498         rcu_read_lock();
4499         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4500                 idx = 0;
4501                 head = &net->dev_index_head[h];
4502                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4503                         if (idx < s_idx)
4504                                 goto cont;
4505                         idev = __in6_dev_get(dev);
4506                         if (!idev)
4507                                 goto cont;
4508                         if (inet6_fill_ifinfo(skb, idev,
4509                                               NETLINK_CB(cb->skb).portid,
4510                                               cb->nlh->nlmsg_seq,
4511                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4512                                 goto out;
4513 cont:
4514                         idx++;
4515                 }
4516         }
4517 out:
4518         rcu_read_unlock();
4519         cb->args[1] = idx;
4520         cb->args[0] = h;
4521 
4522         return skb->len;
4523 }
4524 
4525 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4526 {
4527         struct sk_buff *skb;
4528         struct net *net = dev_net(idev->dev);
4529         int err = -ENOBUFS;
4530 
4531         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4532         if (skb == NULL)
4533                 goto errout;
4534 
4535         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4536         if (err < 0) {
4537                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4538                 WARN_ON(err == -EMSGSIZE);
4539                 kfree_skb(skb);
4540                 goto errout;
4541         }
4542         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4543         return;
4544 errout:
4545         if (err < 0)
4546                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4547 }
4548 
4549 static inline size_t inet6_prefix_nlmsg_size(void)
4550 {
4551         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4552                + nla_total_size(sizeof(struct in6_addr))
4553                + nla_total_size(sizeof(struct prefix_cacheinfo));
4554 }
4555 
4556 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4557                              struct prefix_info *pinfo, u32 portid, u32 seq,
4558                              int event, unsigned int flags)
4559 {
4560         struct prefixmsg *pmsg;
4561         struct nlmsghdr *nlh;
4562         struct prefix_cacheinfo ci;
4563 
4564         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4565         if (nlh == NULL)
4566                 return -EMSGSIZE;
4567 
4568         pmsg = nlmsg_data(nlh);
4569         pmsg->prefix_family = AF_INET6;
4570         pmsg->prefix_pad1 = 0;
4571         pmsg->prefix_pad2 = 0;
4572         pmsg->prefix_ifindex = idev->dev->ifindex;
4573         pmsg->prefix_len = pinfo->prefix_len;
4574         pmsg->prefix_type = pinfo->type;
4575         pmsg->prefix_pad3 = 0;
4576         pmsg->prefix_flags = 0;
4577         if (pinfo->onlink)
4578                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4579         if (pinfo->autoconf)
4580                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4581 
4582         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4583                 goto nla_put_failure;
4584         ci.preferred_time = ntohl(pinfo->prefered);
4585         ci.valid_time = ntohl(pinfo->valid);
4586         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4587                 goto nla_put_failure;
4588         return nlmsg_end(skb, nlh);
4589 
4590 nla_put_failure:
4591         nlmsg_cancel(skb, nlh);
4592         return -EMSGSIZE;
4593 }
4594 
4595 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4596                          struct prefix_info *pinfo)
4597 {
4598         struct sk_buff *skb;
4599         struct net *net = dev_net(idev->dev);
4600         int err = -ENOBUFS;
4601 
4602         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4603         if (skb == NULL)
4604                 goto errout;
4605 
4606         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4607         if (err < 0) {
4608                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4609                 WARN_ON(err == -EMSGSIZE);
4610                 kfree_skb(skb);
4611                 goto errout;
4612         }
4613         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4614         return;
4615 errout:
4616         if (err < 0)
4617                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4618 }
4619 
4620 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4621 {
4622         write_lock_bh(&ifp->idev->lock);
4623         spin_lock(&ifp->lock);
4624         if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4625                             IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4626             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4627                 ifp->idev->valid_ll_addr_cnt += count;
4628         WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4629         spin_unlock(&ifp->lock);
4630         write_unlock_bh(&ifp->idev->lock);
4631 }
4632 
4633 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4634 {
4635         struct net *net = dev_net(ifp->idev->dev);
4636 
4637         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4638 
4639         switch (event) {
4640         case RTM_NEWADDR:
4641                 update_valid_ll_addr_cnt(ifp, 1);
4642 
4643                 /*
4644                  * If the address was optimistic
4645                  * we inserted the route at the start of
4646                  * our DAD process, so we don't need
4647                  * to do it again
4648                  */
4649                 if (!(ifp->rt->rt6i_node))
4650                         ip6_ins_rt(ifp->rt);
4651                 if (ifp->idev->cnf.forwarding)
4652                         addrconf_join_anycast(ifp);
4653                 if (!ipv6_addr_any(&ifp->peer_addr))
4654                         addrconf_prefix_route(&ifp->peer_addr, 128,
4655                                               ifp->idev->dev, 0, 0);
4656                 break;
4657         case RTM_DELADDR:
4658                 update_valid_ll_addr_cnt(ifp, -1);
4659 
4660                 if (ifp->idev->cnf.forwarding)
4661                         addrconf_leave_anycast(ifp);
4662                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4663                 if (!ipv6_addr_any(&ifp->peer_addr)) {
4664                         struct rt6_info *rt;
4665                         struct net_device *dev = ifp->idev->dev;
4666 
4667                         rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4668                                         dev->ifindex, 1);
4669                         if (rt) {
4670                                 dst_hold(&rt->dst);
4671                                 if (ip6_del_rt(rt))
4672                                         dst_free(&rt->dst);
4673                         }
4674                 }
4675                 dst_hold(&ifp->rt->dst);
4676 
4677                 if (ip6_del_rt(ifp->rt))
4678                         dst_free(&ifp->rt->dst);
4679                 break;
4680         }
4681         atomic_inc(&net->ipv6.dev_addr_genid);
4682 }
4683 
4684 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4685 {
4686         rcu_read_lock_bh();
4687         if (likely(ifp->idev->dead == 0))
4688                 __ipv6_ifa_notify(event, ifp);
4689         rcu_read_unlock_bh();
4690 }
4691 
4692 #ifdef CONFIG_SYSCTL
4693 
4694 static
4695 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4696                            void __user *buffer, size_t *lenp, loff_t *ppos)
4697 {
4698         int *valp = ctl->data;
4699         int val = *valp;
4700         loff_t pos = *ppos;
4701         struct ctl_table lctl;
4702         int ret;
4703 
4704         /*
4705          * ctl->data points to idev->cnf.forwarding, we should
4706          * not modify it until we get the rtnl lock.
4707          */
4708         lctl = *ctl;
4709         lctl.data = &val;
4710 
4711         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4712 
4713         if (write)
4714                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4715         if (ret)
4716                 *ppos = pos;
4717         return ret;
4718 }
4719 
4720 static void dev_disable_change(struct inet6_dev *idev)
4721 {
4722         struct netdev_notifier_info info;
4723 
4724         if (!idev || !idev->dev)
4725                 return;
4726 
4727         netdev_notifier_info_init(&info, idev->dev);
4728         if (idev->cnf.disable_ipv6)
4729                 addrconf_notify(NULL, NETDEV_DOWN, &info);
4730         else
4731                 addrconf_notify(NULL, NETDEV_UP, &info);
4732 }
4733 
4734 static void addrconf_disable_change(struct net *net, __s32 newf)
4735 {
4736         struct net_device *dev;
4737         struct inet6_dev *idev;
4738 
4739         rcu_read_lock();
4740         for_each_netdev_rcu(net, dev) {
4741                 idev = __in6_dev_get(dev);
4742                 if (idev) {
4743                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4744                         idev->cnf.disable_ipv6 = newf;
4745                         if (changed)
4746                                 dev_disable_change(idev);
4747                 }
4748         }
4749         rcu_read_unlock();
4750 }
4751 
4752 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4753 {
4754         struct net *net;
4755         int old;
4756 
4757         if (!rtnl_trylock())
4758                 return restart_syscall();
4759 
4760         net = (struct net *)table->extra2;
4761         old = *p;
4762         *p = newf;
4763 
4764         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4765                 rtnl_unlock();
4766                 return 0;
4767         }
4768 
4769         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4770                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4771                 addrconf_disable_change(net, newf);
4772         } else if ((!newf) ^ (!old))
4773                 dev_disable_change((struct inet6_dev *)table->extra1);
4774 
4775         rtnl_unlock();
4776         return 0;
4777 }
4778 
4779 static
4780 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4781                             void __user *buffer, size_t *lenp, loff_t *ppos)
4782 {
4783         int *valp = ctl->data;
4784         int val = *valp;
4785         loff_t pos = *ppos;
4786         struct ctl_table lctl;
4787         int ret;
4788 
4789         /*
4790          * ctl->data points to idev->cnf.disable_ipv6, we should
4791          * not modify it until we get the rtnl lock.
4792          */
4793         lctl = *ctl;
4794         lctl.data = &val;
4795 
4796         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4797 
4798         if (write)
4799                 ret = addrconf_disable_ipv6(ctl, valp, val);
4800         if (ret)
4801                 *ppos = pos;
4802         return ret;
4803 }
4804 
4805 static struct addrconf_sysctl_table
4806 {
4807         struct ctl_table_header *sysctl_header;
4808         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4809 } addrconf_sysctl __read_mostly = {
4810         .sysctl_header = NULL,
4811         .addrconf_vars = {
4812                 {
4813                         .procname       = "forwarding",
4814                         .data           = &ipv6_devconf.forwarding,
4815                         .maxlen         = sizeof(int),
4816                         .mode           = 0644,
4817                         .proc_handler   = addrconf_sysctl_forward,
4818                 },
4819                 {
4820                         .procname       = "hop_limit",
4821                         .data           = &ipv6_devconf.hop_limit,
4822                         .maxlen         = sizeof(int),
4823                         .mode           = 0644,
4824                         .proc_handler   = proc_dointvec,
4825                 },
4826                 {
4827                         .procname       = "mtu",
4828                         .data           = &ipv6_devconf.mtu6,
4829                         .maxlen         = sizeof(int),
4830                         .mode           = 0644,
4831                         .proc_handler   = proc_dointvec,
4832                 },
4833                 {
4834                         .procname       = "accept_ra",
4835                         .data           = &ipv6_devconf.accept_ra,
4836                         .maxlen         = sizeof(int),
4837                         .mode           = 0644,
4838                         .proc_handler   = proc_dointvec,
4839                 },
4840                 {
4841                         .procname       = "accept_redirects",
4842                         .data           = &ipv6_devconf.accept_redirects,
4843                         .maxlen         = sizeof(int),
4844                         .mode           = 0644,
4845                         .proc_handler   = proc_dointvec,
4846                 },
4847                 {
4848                         .procname       = "autoconf",
4849                         .data           = &ipv6_devconf.autoconf,
4850                         .maxlen         = sizeof(int),
4851                         .mode           = 0644,
4852                         .proc_handler   = proc_dointvec,
4853                 },
4854                 {
4855                         .procname       = "dad_transmits",
4856                         .data           = &ipv6_devconf.dad_transmits,
4857                         .maxlen         = sizeof(int),
4858                         .mode           = 0644,
4859                         .proc_handler   = proc_dointvec,
4860                 },
4861                 {
4862                         .procname       = "router_solicitations",
4863                         .data           = &ipv6_devconf.rtr_solicits,
4864                         .maxlen         = sizeof(int),
4865                         .mode           = 0644,
4866                         .proc_handler   = proc_dointvec,
4867                 },
4868                 {
4869                         .procname       = "router_solicitation_interval",
4870                         .data           = &ipv6_devconf.rtr_solicit_interval,
4871                         .maxlen         = sizeof(int),
4872                         .mode           = 0644,
4873                         .proc_handler   = proc_dointvec_jiffies,
4874                 },
4875                 {
4876                         .procname       = "router_solicitation_delay",
4877                         .data           = &ipv6_devconf.rtr_solicit_delay,
4878                         .maxlen         = sizeof(int),
4879                         .mode           = 0644,
4880                         .proc_handler   = proc_dointvec_jiffies,
4881                 },
4882                 {
4883                         .procname       = "force_mld_version",
4884                         .data           = &ipv6_devconf.force_mld_version,
4885                         .maxlen         = sizeof(int),
4886                         .mode           = 0644,
4887                         .proc_handler   = proc_dointvec,
4888                 },
4889 #ifdef CONFIG_IPV6_PRIVACY
4890                 {
4891                         .procname       = "use_tempaddr",
4892                         .data           = &ipv6_devconf.use_tempaddr,
4893                         .maxlen         = sizeof(int),
4894                         .mode           = 0644,
4895                         .proc_handler   = proc_dointvec,
4896                 },
4897                 {
4898                         .procname       = "temp_valid_lft",
4899                         .data           = &ipv6_devconf.temp_valid_lft,
4900                         .maxlen         = sizeof(int),
4901                         .mode           = 0644,
4902                         .proc_handler   = proc_dointvec,
4903                 },
4904                 {
4905                         .procname       = "temp_prefered_lft",
4906                         .data           = &ipv6_devconf.temp_prefered_lft,
4907                         .maxlen         = sizeof(int),
4908                         .mode           = 0644,
4909                         .proc_handler   = proc_dointvec,
4910                 },
4911                 {
4912                         .procname       = "regen_max_retry",
4913                         .data           = &ipv6_devconf.regen_max_retry,
4914                         .maxlen         = sizeof(int),
4915                         .mode           = 0644,
4916                         .proc_handler   = proc_dointvec,
4917                 },
4918                 {
4919                         .procname       = "max_desync_factor",
4920                         .data           = &ipv6_devconf.max_desync_factor,
4921                         .maxlen         = sizeof(int),
4922                         .mode           = 0644,
4923                         .proc_handler   = proc_dointvec,
4924                 },
4925 #endif
4926                 {
4927                         .procname       = "max_addresses",
4928                         .data           = &ipv6_devconf.max_addresses,
4929                         .maxlen         = sizeof(int),
4930                         .mode           = 0644,
4931                         .proc_handler   = proc_dointvec,
4932                 },
4933                 {
4934                         .procname       = "accept_ra_defrtr",
4935                         .data           = &ipv6_devconf.accept_ra_defrtr,
4936                         .maxlen         = sizeof(int),
4937                         .mode           = 0644,
4938                         .proc_handler   = proc_dointvec,
4939                 },
4940                 {
4941                         .procname       = "accept_ra_pinfo",
4942                         .data           = &ipv6_devconf.accept_ra_pinfo,
4943                         .maxlen         = sizeof(int),
4944                         .mode           = 0644,
4945                         .proc_handler   = proc_dointvec,
4946                 },
4947 #ifdef CONFIG_IPV6_ROUTER_PREF
4948                 {
4949                         .procname       = "accept_ra_rtr_pref",
4950                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4951                         .maxlen         = sizeof(int),
4952                         .mode           = 0644,
4953                         .proc_handler   = proc_dointvec,
4954                 },
4955                 {
4956                         .procname       = "router_probe_interval",
4957                         .data           = &ipv6_devconf.rtr_probe_interval,
4958                         .maxlen         = sizeof(int),
4959                         .mode           = 0644,
4960                         .proc_handler   = proc_dointvec_jiffies,
4961                 },
4962 #ifdef CONFIG_IPV6_ROUTE_INFO
4963                 {
4964                         .procname       = "accept_ra_rt_info_max_plen",
4965                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4966                         .maxlen         = sizeof(int),
4967                         .mode           = 0644,
4968                         .proc_handler   = proc_dointvec,
4969                 },
4970 #endif
4971 #endif
4972                 {
4973                         .procname       = "proxy_ndp",
4974                         .data           = &ipv6_devconf.proxy_ndp,
4975                         .maxlen         = sizeof(int),
4976                         .mode           = 0644,
4977                         .proc_handler   = proc_dointvec,
4978                 },
4979                 {
4980                         .procname       = "accept_source_route",
4981                         .data           = &ipv6_devconf.accept_source_route,
4982                         .maxlen         = sizeof(int),
4983                         .mode           = 0644,
4984                         .proc_handler   = proc_dointvec,
4985                 },
4986 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4987                 {
4988                         .procname       = "optimistic_dad",
4989                         .data           = &ipv6_devconf.optimistic_dad,
4990                         .maxlen         = sizeof(int),
4991                         .mode           = 0644,
4992                         .proc_handler   = proc_dointvec,
4993 
4994                 },
4995 #endif
4996 #ifdef CONFIG_IPV6_MROUTE
4997                 {
4998                         .procname       = "mc_forwarding",
4999                         .data           = &ipv6_devconf.mc_forwarding,
5000                         .maxlen         = sizeof(int),
5001                         .mode           = 0444,
5002                         .proc_handler   = proc_dointvec,
5003                 },
5004 #endif
5005                 {
5006                         .procname       = "disable_ipv6",
5007                         .data           = &ipv6_devconf.disable_ipv6,
5008                         .maxlen         = sizeof(int),
5009                         .mode           = 0644,
5010                         .proc_handler   = addrconf_sysctl_disable,
5011                 },
5012                 {
5013                         .procname       = "accept_dad",
5014                         .data           = &ipv6_devconf.accept_dad,
5015                         .maxlen         = sizeof(int),
5016                         .mode           = 0644,
5017                         .proc_handler   = proc_dointvec,
5018                 },
5019                 {
5020                         .procname       = "force_tllao",
5021                         .data           = &ipv6_devconf.force_tllao,
5022                         .maxlen         = sizeof(int),
5023                         .mode           = 0644,
5024                         .proc_handler   = proc_dointvec
5025                 },
5026                 {
5027                         .procname       = "ndisc_notify",
5028                         .data           = &ipv6_devconf.ndisc_notify,
5029                         .maxlen         = sizeof(int),
5030                         .mode           = 0644,
5031                         .proc_handler   = proc_dointvec
5032                 },
5033                 {
5034                         /* sentinel */
5035                 }
5036         },
5037 };
5038 
5039 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5040                 struct inet6_dev *idev, struct ipv6_devconf *p)
5041 {
5042         int i;
5043         struct addrconf_sysctl_table *t;
5044         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5045 
5046         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5047         if (t == NULL)
5048                 goto out;
5049 
5050         for (i = 0; t->addrconf_vars[i].data; i++) {
5051                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5052                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5053                 t->addrconf_vars[i].extra2 = net;
5054         }
5055 
5056         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5057 
5058         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5059         if (t->sysctl_header == NULL)
5060                 goto free;
5061 
5062         p->sysctl = t;
5063         return 0;
5064 
5065 free:
5066         kfree(t);
5067 out:
5068         return -ENOBUFS;
5069 }
5070 
5071 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5072 {
5073         struct addrconf_sysctl_table *t;
5074 
5075         if (p->sysctl == NULL)
5076                 return;
5077 
5078         t = p->sysctl;
5079         p->sysctl = NULL;
5080         unregister_net_sysctl_table(t->sysctl_header);
5081         kfree(t);
5082 }
5083 
5084 static void addrconf_sysctl_register(struct inet6_dev *idev)
5085 {
5086         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5087                               &ndisc_ifinfo_sysctl_change);
5088         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5089                                         idev, &idev->cnf);
5090 }
5091 
5092 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5093 {
5094         __addrconf_sysctl_unregister(&idev->cnf);
5095         neigh_sysctl_unregister(idev->nd_parms);
5096 }
5097 
5098 
5099 #endif
5100 
5101 static int __net_init addrconf_init_net(struct net *net)
5102 {
5103         int err = -ENOMEM;
5104         struct ipv6_devconf *all, *dflt;
5105 
5106         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5107         if (all == NULL)
5108                 goto err_alloc_all;
5109 
5110         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5111         if (dflt == NULL)
5112                 goto err_alloc_dflt;
5113 
5114         /* these will be inherited by all namespaces */
5115         dflt->autoconf = ipv6_defaults.autoconf;
5116         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5117 
5118         net->ipv6.devconf_all = all;
5119         net->ipv6.devconf_dflt = dflt;
5120 
5121 #ifdef CONFIG_SYSCTL
5122         err = __addrconf_sysctl_register(net, "all", NULL, all);
5123         if (err < 0)
5124                 goto err_reg_all;
5125 
5126         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5127         if (err < 0)
5128                 goto err_reg_dflt;
5129 #endif
5130         return 0;
5131 
5132 #ifdef CONFIG_SYSCTL
5133 err_reg_dflt:
5134         __addrconf_sysctl_unregister(all);
5135 err_reg_all:
5136         kfree(dflt);
5137 #endif
5138 err_alloc_dflt:
5139         kfree(all);
5140 err_alloc_all:
5141         return err;
5142 }
5143 
5144 static void __net_exit addrconf_exit_net(struct net *net)
5145 {
5146 #ifdef CONFIG_SYSCTL
5147         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5148         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5149 #endif
5150         if (!net_eq(net, &init_net)) {
5151                 kfree(net->ipv6.devconf_dflt);
5152                 kfree(net->ipv6.devconf_all);
5153         }
5154 }
5155 
5156 static struct pernet_operations addrconf_ops = {
5157         .init = addrconf_init_net,
5158         .exit = addrconf_exit_net,
5159 };
5160 
5161 static struct rtnl_af_ops inet6_ops = {
5162         .family           = AF_INET6,
5163         .fill_link_af     = inet6_fill_link_af,
5164         .get_link_af_size = inet6_get_link_af_size,
5165         .set_link_af      = inet6_set_link_af,
5166 };
5167 
5168 /*
5169  *      Init / cleanup code
5170  */
5171 
5172 int __init addrconf_init(void)
5173 {
5174         int i, err;
5175 
5176         err = ipv6_addr_label_init();
5177         if (err < 0) {
5178                 pr_crit("%s: cannot initialize default policy table: %d\n",
5179                         __func__, err);
5180                 goto out;
5181         }
5182 
5183         err = register_pernet_subsys(&addrconf_ops);
5184         if (err < 0)
5185                 goto out_addrlabel;
5186 
5187         /* The addrconf netdev notifier requires that loopback_dev
5188          * has it's ipv6 private information allocated and setup
5189          * before it can bring up and give link-local addresses
5190          * to other devices which are up.
5191          *
5192          * Unfortunately, loopback_dev is not necessarily the first
5193          * entry in the global dev_base list of net devices.  In fact,
5194          * it is likely to be the very last entry on that list.
5195          * So this causes the notifier registry below to try and
5196          * give link-local addresses to all devices besides loopback_dev
5197          * first, then loopback_dev, which cases all the non-loopback_dev
5198          * devices to fail to get a link-local address.
5199          *
5200          * So, as a temporary fix, allocate the ipv6 structure for
5201          * loopback_dev first by hand.
5202          * Longer term, all of the dependencies ipv6 has upon the loopback
5203          * device and it being up should be removed.
5204          */
5205         rtnl_lock();
5206         if (!ipv6_add_dev(init_net.loopback_dev))
5207                 err = -ENOMEM;
5208         rtnl_unlock();
5209         if (err)
5210                 goto errlo;
5211 
5212         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5213                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5214 
5215         register_netdevice_notifier(&ipv6_dev_notf);
5216 
5217         addrconf_verify(0);
5218 
5219         err = rtnl_af_register(&inet6_ops);
5220         if (err < 0)
5221                 goto errout_af;
5222 
5223         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5224                               NULL);
5225         if (err < 0)
5226                 goto errout;
5227 
5228         /* Only the first call to __rtnl_register can fail */
5229         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5230         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5231         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5232                         inet6_dump_ifaddr, NULL);
5233         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5234                         inet6_dump_ifmcaddr, NULL);
5235         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5236                         inet6_dump_ifacaddr, NULL);
5237         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5238                         inet6_netconf_dump_devconf, NULL);
5239 
5240         ipv6_addr_label_rtnl_register();
5241 
5242         return 0;
5243 errout:
5244         rtnl_af_unregister(&inet6_ops);
5245 errout_af:
5246         unregister_netdevice_notifier(&ipv6_dev_notf);
5247 errlo:
5248         unregister_pernet_subsys(&addrconf_ops);
5249 out_addrlabel:
5250         ipv6_addr_label_cleanup();
5251 out:
5252         return err;
5253 }
5254 
5255 void addrconf_cleanup(void)
5256 {
5257         struct net_device *dev;
5258         int i;
5259 
5260         unregister_netdevice_notifier(&ipv6_dev_notf);
5261         unregister_pernet_subsys(&addrconf_ops);
5262         ipv6_addr_label_cleanup();
5263 
5264         rtnl_lock();
5265 
5266         __rtnl_af_unregister(&inet6_ops);
5267 
5268         /* clean dev list */
5269         for_each_netdev(&init_net, dev) {
5270                 if (__in6_dev_get(dev) == NULL)
5271                         continue;
5272                 addrconf_ifdown(dev, 1);
5273         }
5274         addrconf_ifdown(init_net.loopback_dev, 2);
5275 
5276         /*
5277          *      Check hash table.
5278          */
5279         spin_lock_bh(&addrconf_hash_lock);
5280         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5281                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5282         spin_unlock_bh(&addrconf_hash_lock);
5283 
5284         del_timer(&addr_chk_timer);
5285         rtnl_unlock();
5286 }
5287 

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