1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 */
10
11 /*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
35 */
36
37 #define pr_fmt(fmt) "IPv6: " fmt
38
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
65
66 #include <net/net_namespace.h>
67 #include <net/sock.h>
68 #include <net/snmp.h>
69
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
72 #include <net/ipv6.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
77 #include <net/tcp.h>
78 #include <net/ip.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
88
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
92
93 #define INFINITY_LIFE_TIME 0xFFFFFFFF
94
95 #define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
cstamp_delta(unsigned long cstamp)98 static inline u32 cstamp_delta(unsigned long cstamp)
99 {
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101 }
102
rfc3315_s14_backoff_init(s32 irt)103 static inline s32 rfc3315_s14_backoff_init(s32 irt)
104 {
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109 }
110
rfc3315_s14_backoff_update(s32 rt,s32 mrt)111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112 {
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122 }
123
124 #ifdef CONFIG_SYSCTL
125 static int addrconf_sysctl_register(struct inet6_dev *idev);
126 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127 #else
addrconf_sysctl_register(struct inet6_dev * idev)128 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129 {
130 return 0;
131 }
132
addrconf_sysctl_unregister(struct inet6_dev * idev)133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134 {
135 }
136 #endif
137
138 static void ipv6_regen_rndid(struct inet6_dev *idev);
139 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
140
141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142 static int ipv6_count_addresses(const struct inet6_dev *idev);
143 static int ipv6_generate_stable_address(struct in6_addr *addr,
144 u8 dad_count,
145 const struct inet6_dev *idev);
146
147 #define IN6_ADDR_HSIZE_SHIFT 8
148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
149 /*
150 * Configured unicast address hash table
151 */
152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
153 static DEFINE_SPINLOCK(addrconf_hash_lock);
154
155 static void addrconf_verify(void);
156 static void addrconf_verify_rtnl(void);
157 static void addrconf_verify_work(struct work_struct *);
158
159 static struct workqueue_struct *addrconf_wq;
160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
161
162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
164
165 static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
167 static int addrconf_ifdown(struct net_device *dev, int how);
168
169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
170 int plen,
171 const struct net_device *dev,
172 u32 flags, u32 noflags,
173 bool no_gw);
174
175 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
176 static void addrconf_dad_work(struct work_struct *w);
177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
178 bool send_na);
179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
180 static void addrconf_rs_timer(struct timer_list *t);
181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
183
184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
185 struct prefix_info *pinfo);
186
187 static struct ipv6_devconf ipv6_devconf __read_mostly = {
188 .forwarding = 0,
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
191 .accept_ra = 1,
192 .accept_redirects = 1,
193 .autoconf = 1,
194 .force_mld_version = 0,
195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 .max_addresses = IPV6_MAX_ADDRESSES,
208 .accept_ra_defrtr = 1,
209 .accept_ra_from_local = 0,
210 .accept_ra_min_hop_limit= 1,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_min_plen = 0,
217 .accept_ra_rt_info_max_plen = 0,
218 #endif
219 #endif
220 .accept_ra_rt_table = 0,
221 .proxy_ndp = 0,
222 .accept_source_route = 0, /* we do not accept RH0 by default. */
223 .disable_ipv6 = 0,
224 .accept_dad = 0,
225 .suppress_frag_ndisc = 1,
226 .accept_ra_mtu = 1,
227 .stable_secret = {
228 .initialized = false,
229 },
230 .use_oif_addrs_only = 0,
231 .ignore_routes_with_linkdown = 0,
232 .keep_addr_on_down = 0,
233 .seg6_enabled = 0,
234 #ifdef CONFIG_IPV6_SEG6_HMAC
235 .seg6_require_hmac = 0,
236 #endif
237 .enhanced_dad = 1,
238 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
239 .disable_policy = 0,
240 };
241
242 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
243 .forwarding = 0,
244 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
245 .mtu6 = IPV6_MIN_MTU,
246 .accept_ra = 1,
247 .accept_redirects = 1,
248 .autoconf = 1,
249 .force_mld_version = 0,
250 .mldv1_unsolicited_report_interval = 10 * HZ,
251 .mldv2_unsolicited_report_interval = HZ,
252 .dad_transmits = 1,
253 .rtr_solicits = MAX_RTR_SOLICITATIONS,
254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
257 .use_tempaddr = 0,
258 .temp_valid_lft = TEMP_VALID_LIFETIME,
259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
260 .regen_max_retry = REGEN_MAX_RETRY,
261 .max_desync_factor = MAX_DESYNC_FACTOR,
262 .max_addresses = IPV6_MAX_ADDRESSES,
263 .accept_ra_defrtr = 1,
264 .accept_ra_from_local = 0,
265 .accept_ra_min_hop_limit= 1,
266 .accept_ra_pinfo = 1,
267 #ifdef CONFIG_IPV6_ROUTER_PREF
268 .accept_ra_rtr_pref = 1,
269 .rtr_probe_interval = 60 * HZ,
270 #ifdef CONFIG_IPV6_ROUTE_INFO
271 .accept_ra_rt_info_min_plen = 0,
272 .accept_ra_rt_info_max_plen = 0,
273 #endif
274 #endif
275 .accept_ra_rt_table = 0,
276 .proxy_ndp = 0,
277 .accept_source_route = 0, /* we do not accept RH0 by default. */
278 .disable_ipv6 = 0,
279 .accept_dad = 1,
280 .suppress_frag_ndisc = 1,
281 .accept_ra_mtu = 1,
282 .stable_secret = {
283 .initialized = false,
284 },
285 .use_oif_addrs_only = 0,
286 .ignore_routes_with_linkdown = 0,
287 .keep_addr_on_down = 0,
288 .seg6_enabled = 0,
289 #ifdef CONFIG_IPV6_SEG6_HMAC
290 .seg6_require_hmac = 0,
291 #endif
292 .enhanced_dad = 1,
293 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
294 .disable_policy = 0,
295 };
296
297 /* Check if link is ready: is it up and is a valid qdisc available */
addrconf_link_ready(const struct net_device * dev)298 static inline bool addrconf_link_ready(const struct net_device *dev)
299 {
300 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
301 }
302
addrconf_del_rs_timer(struct inet6_dev * idev)303 static void addrconf_del_rs_timer(struct inet6_dev *idev)
304 {
305 if (del_timer(&idev->rs_timer))
306 __in6_dev_put(idev);
307 }
308
addrconf_del_dad_work(struct inet6_ifaddr * ifp)309 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
310 {
311 if (cancel_delayed_work(&ifp->dad_work))
312 __in6_ifa_put(ifp);
313 }
314
addrconf_mod_rs_timer(struct inet6_dev * idev,unsigned long when)315 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
316 unsigned long when)
317 {
318 if (!timer_pending(&idev->rs_timer))
319 in6_dev_hold(idev);
320 mod_timer(&idev->rs_timer, jiffies + when);
321 }
322
addrconf_mod_dad_work(struct inet6_ifaddr * ifp,unsigned long delay)323 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
324 unsigned long delay)
325 {
326 in6_ifa_hold(ifp);
327 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
328 in6_ifa_put(ifp);
329 }
330
snmp6_alloc_dev(struct inet6_dev * idev)331 static int snmp6_alloc_dev(struct inet6_dev *idev)
332 {
333 int i;
334
335 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
336 if (!idev->stats.ipv6)
337 goto err_ip;
338
339 for_each_possible_cpu(i) {
340 struct ipstats_mib *addrconf_stats;
341 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
342 u64_stats_init(&addrconf_stats->syncp);
343 }
344
345
346 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
347 GFP_KERNEL);
348 if (!idev->stats.icmpv6dev)
349 goto err_icmp;
350 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
351 GFP_KERNEL);
352 if (!idev->stats.icmpv6msgdev)
353 goto err_icmpmsg;
354
355 return 0;
356
357 err_icmpmsg:
358 kfree(idev->stats.icmpv6dev);
359 err_icmp:
360 free_percpu(idev->stats.ipv6);
361 err_ip:
362 return -ENOMEM;
363 }
364
ipv6_add_dev(struct net_device * dev)365 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
366 {
367 struct inet6_dev *ndev;
368 int err = -ENOMEM;
369
370 ASSERT_RTNL();
371
372 if (dev->mtu < IPV6_MIN_MTU)
373 return ERR_PTR(-EINVAL);
374
375 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
376 if (!ndev)
377 return ERR_PTR(err);
378
379 rwlock_init(&ndev->lock);
380 ndev->dev = dev;
381 INIT_LIST_HEAD(&ndev->addr_list);
382 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
383 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
384
385 if (ndev->cnf.stable_secret.initialized)
386 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
387
388 ndev->cnf.mtu6 = dev->mtu;
389 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
390 if (!ndev->nd_parms) {
391 kfree(ndev);
392 return ERR_PTR(err);
393 }
394 if (ndev->cnf.forwarding)
395 dev_disable_lro(dev);
396 /* We refer to the device */
397 dev_hold(dev);
398
399 if (snmp6_alloc_dev(ndev) < 0) {
400 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
401 __func__);
402 neigh_parms_release(&nd_tbl, ndev->nd_parms);
403 dev_put(dev);
404 kfree(ndev);
405 return ERR_PTR(err);
406 }
407
408 if (snmp6_register_dev(ndev) < 0) {
409 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
410 __func__, dev->name);
411 goto err_release;
412 }
413
414 /* One reference from device. */
415 refcount_set(&ndev->refcnt, 1);
416
417 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
418 ndev->cnf.accept_dad = -1;
419
420 #if IS_ENABLED(CONFIG_IPV6_SIT)
421 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
422 pr_info("%s: Disabled Multicast RS\n", dev->name);
423 ndev->cnf.rtr_solicits = 0;
424 }
425 #endif
426
427 INIT_LIST_HEAD(&ndev->tempaddr_list);
428 ndev->desync_factor = U32_MAX;
429 if ((dev->flags&IFF_LOOPBACK) ||
430 dev->type == ARPHRD_TUNNEL ||
431 dev->type == ARPHRD_TUNNEL6 ||
432 dev->type == ARPHRD_SIT ||
433 dev->type == ARPHRD_NONE) {
434 ndev->cnf.use_tempaddr = -1;
435 } else
436 ipv6_regen_rndid(ndev);
437
438 ndev->token = in6addr_any;
439
440 if (netif_running(dev) && addrconf_link_ready(dev))
441 ndev->if_flags |= IF_READY;
442
443 ipv6_mc_init_dev(ndev);
444 ndev->tstamp = jiffies;
445 err = addrconf_sysctl_register(ndev);
446 if (err) {
447 ipv6_mc_destroy_dev(ndev);
448 snmp6_unregister_dev(ndev);
449 goto err_release;
450 }
451 /* protected by rtnl_lock */
452 rcu_assign_pointer(dev->ip6_ptr, ndev);
453
454 /* Join interface-local all-node multicast group */
455 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
456
457 /* Join all-node multicast group */
458 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
459
460 /* Join all-router multicast group if forwarding is set */
461 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
462 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
463
464 return ndev;
465
466 err_release:
467 neigh_parms_release(&nd_tbl, ndev->nd_parms);
468 ndev->dead = 1;
469 in6_dev_finish_destroy(ndev);
470 return ERR_PTR(err);
471 }
472
ipv6_find_idev(struct net_device * dev)473 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
474 {
475 struct inet6_dev *idev;
476
477 ASSERT_RTNL();
478
479 idev = __in6_dev_get(dev);
480 if (!idev) {
481 idev = ipv6_add_dev(dev);
482 if (IS_ERR(idev))
483 return idev;
484 }
485
486 if (dev->flags&IFF_UP)
487 ipv6_mc_up(idev);
488 return idev;
489 }
490
inet6_netconf_msgsize_devconf(int type)491 static int inet6_netconf_msgsize_devconf(int type)
492 {
493 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
494 + nla_total_size(4); /* NETCONFA_IFINDEX */
495 bool all = false;
496
497 if (type == NETCONFA_ALL)
498 all = true;
499
500 if (all || type == NETCONFA_FORWARDING)
501 size += nla_total_size(4);
502 #ifdef CONFIG_IPV6_MROUTE
503 if (all || type == NETCONFA_MC_FORWARDING)
504 size += nla_total_size(4);
505 #endif
506 if (all || type == NETCONFA_PROXY_NEIGH)
507 size += nla_total_size(4);
508
509 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
510 size += nla_total_size(4);
511
512 return size;
513 }
514
inet6_netconf_fill_devconf(struct sk_buff * skb,int ifindex,struct ipv6_devconf * devconf,u32 portid,u32 seq,int event,unsigned int flags,int type)515 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
516 struct ipv6_devconf *devconf, u32 portid,
517 u32 seq, int event, unsigned int flags,
518 int type)
519 {
520 struct nlmsghdr *nlh;
521 struct netconfmsg *ncm;
522 bool all = false;
523
524 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
525 flags);
526 if (!nlh)
527 return -EMSGSIZE;
528
529 if (type == NETCONFA_ALL)
530 all = true;
531
532 ncm = nlmsg_data(nlh);
533 ncm->ncm_family = AF_INET6;
534
535 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
536 goto nla_put_failure;
537
538 if (!devconf)
539 goto out;
540
541 if ((all || type == NETCONFA_FORWARDING) &&
542 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
543 goto nla_put_failure;
544 #ifdef CONFIG_IPV6_MROUTE
545 if ((all || type == NETCONFA_MC_FORWARDING) &&
546 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
547 devconf->mc_forwarding) < 0)
548 goto nla_put_failure;
549 #endif
550 if ((all || type == NETCONFA_PROXY_NEIGH) &&
551 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
552 goto nla_put_failure;
553
554 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
555 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
556 devconf->ignore_routes_with_linkdown) < 0)
557 goto nla_put_failure;
558
559 out:
560 nlmsg_end(skb, nlh);
561 return 0;
562
563 nla_put_failure:
564 nlmsg_cancel(skb, nlh);
565 return -EMSGSIZE;
566 }
567
inet6_netconf_notify_devconf(struct net * net,int event,int type,int ifindex,struct ipv6_devconf * devconf)568 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
569 int ifindex, struct ipv6_devconf *devconf)
570 {
571 struct sk_buff *skb;
572 int err = -ENOBUFS;
573
574 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
575 if (!skb)
576 goto errout;
577
578 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
579 event, 0, type);
580 if (err < 0) {
581 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
582 WARN_ON(err == -EMSGSIZE);
583 kfree_skb(skb);
584 goto errout;
585 }
586 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
587 return;
588 errout:
589 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
590 }
591
592 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
593 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
594 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
595 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
596 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
597 };
598
inet6_netconf_valid_get_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)599 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
600 const struct nlmsghdr *nlh,
601 struct nlattr **tb,
602 struct netlink_ext_ack *extack)
603 {
604 int i, err;
605
606 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
607 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
608 return -EINVAL;
609 }
610
611 if (!netlink_strict_get_check(skb))
612 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
613 tb, NETCONFA_MAX,
614 devconf_ipv6_policy, extack);
615
616 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
617 tb, NETCONFA_MAX,
618 devconf_ipv6_policy, extack);
619 if (err)
620 return err;
621
622 for (i = 0; i <= NETCONFA_MAX; i++) {
623 if (!tb[i])
624 continue;
625
626 switch (i) {
627 case NETCONFA_IFINDEX:
628 break;
629 default:
630 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
631 return -EINVAL;
632 }
633 }
634
635 return 0;
636 }
637
inet6_netconf_get_devconf(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)638 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
639 struct nlmsghdr *nlh,
640 struct netlink_ext_ack *extack)
641 {
642 struct net *net = sock_net(in_skb->sk);
643 struct nlattr *tb[NETCONFA_MAX+1];
644 struct inet6_dev *in6_dev = NULL;
645 struct net_device *dev = NULL;
646 struct sk_buff *skb;
647 struct ipv6_devconf *devconf;
648 int ifindex;
649 int err;
650
651 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
652 if (err < 0)
653 return err;
654
655 if (!tb[NETCONFA_IFINDEX])
656 return -EINVAL;
657
658 err = -EINVAL;
659 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
660 switch (ifindex) {
661 case NETCONFA_IFINDEX_ALL:
662 devconf = net->ipv6.devconf_all;
663 break;
664 case NETCONFA_IFINDEX_DEFAULT:
665 devconf = net->ipv6.devconf_dflt;
666 break;
667 default:
668 dev = dev_get_by_index(net, ifindex);
669 if (!dev)
670 return -EINVAL;
671 in6_dev = in6_dev_get(dev);
672 if (!in6_dev)
673 goto errout;
674 devconf = &in6_dev->cnf;
675 break;
676 }
677
678 err = -ENOBUFS;
679 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
680 if (!skb)
681 goto errout;
682
683 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
684 NETLINK_CB(in_skb).portid,
685 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
686 NETCONFA_ALL);
687 if (err < 0) {
688 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
689 WARN_ON(err == -EMSGSIZE);
690 kfree_skb(skb);
691 goto errout;
692 }
693 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
694 errout:
695 if (in6_dev)
696 in6_dev_put(in6_dev);
697 if (dev)
698 dev_put(dev);
699 return err;
700 }
701
inet6_netconf_dump_devconf(struct sk_buff * skb,struct netlink_callback * cb)702 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
703 struct netlink_callback *cb)
704 {
705 const struct nlmsghdr *nlh = cb->nlh;
706 struct net *net = sock_net(skb->sk);
707 int h, s_h;
708 int idx, s_idx;
709 struct net_device *dev;
710 struct inet6_dev *idev;
711 struct hlist_head *head;
712
713 if (cb->strict_check) {
714 struct netlink_ext_ack *extack = cb->extack;
715 struct netconfmsg *ncm;
716
717 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
718 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
719 return -EINVAL;
720 }
721
722 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
723 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
724 return -EINVAL;
725 }
726 }
727
728 s_h = cb->args[0];
729 s_idx = idx = cb->args[1];
730
731 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
732 idx = 0;
733 head = &net->dev_index_head[h];
734 rcu_read_lock();
735 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
736 net->dev_base_seq;
737 hlist_for_each_entry_rcu(dev, head, index_hlist) {
738 if (idx < s_idx)
739 goto cont;
740 idev = __in6_dev_get(dev);
741 if (!idev)
742 goto cont;
743
744 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
745 &idev->cnf,
746 NETLINK_CB(cb->skb).portid,
747 nlh->nlmsg_seq,
748 RTM_NEWNETCONF,
749 NLM_F_MULTI,
750 NETCONFA_ALL) < 0) {
751 rcu_read_unlock();
752 goto done;
753 }
754 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
755 cont:
756 idx++;
757 }
758 rcu_read_unlock();
759 }
760 if (h == NETDEV_HASHENTRIES) {
761 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
762 net->ipv6.devconf_all,
763 NETLINK_CB(cb->skb).portid,
764 nlh->nlmsg_seq,
765 RTM_NEWNETCONF, NLM_F_MULTI,
766 NETCONFA_ALL) < 0)
767 goto done;
768 else
769 h++;
770 }
771 if (h == NETDEV_HASHENTRIES + 1) {
772 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
773 net->ipv6.devconf_dflt,
774 NETLINK_CB(cb->skb).portid,
775 nlh->nlmsg_seq,
776 RTM_NEWNETCONF, NLM_F_MULTI,
777 NETCONFA_ALL) < 0)
778 goto done;
779 else
780 h++;
781 }
782 done:
783 cb->args[0] = h;
784 cb->args[1] = idx;
785
786 return skb->len;
787 }
788
789 #ifdef CONFIG_SYSCTL
dev_forward_change(struct inet6_dev * idev)790 static void dev_forward_change(struct inet6_dev *idev)
791 {
792 struct net_device *dev;
793 struct inet6_ifaddr *ifa;
794
795 if (!idev)
796 return;
797 dev = idev->dev;
798 if (idev->cnf.forwarding)
799 dev_disable_lro(dev);
800 if (dev->flags & IFF_MULTICAST) {
801 if (idev->cnf.forwarding) {
802 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
803 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
804 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
805 } else {
806 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
807 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
808 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
809 }
810 }
811
812 list_for_each_entry(ifa, &idev->addr_list, if_list) {
813 if (ifa->flags&IFA_F_TENTATIVE)
814 continue;
815 if (idev->cnf.forwarding)
816 addrconf_join_anycast(ifa);
817 else
818 addrconf_leave_anycast(ifa);
819 }
820 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
821 NETCONFA_FORWARDING,
822 dev->ifindex, &idev->cnf);
823 }
824
825
addrconf_forward_change(struct net * net,__s32 newf)826 static void addrconf_forward_change(struct net *net, __s32 newf)
827 {
828 struct net_device *dev;
829 struct inet6_dev *idev;
830
831 for_each_netdev(net, dev) {
832 idev = __in6_dev_get(dev);
833 if (idev) {
834 int changed = (!idev->cnf.forwarding) ^ (!newf);
835 idev->cnf.forwarding = newf;
836 if (changed)
837 dev_forward_change(idev);
838 }
839 }
840 }
841
addrconf_fixup_forwarding(struct ctl_table * table,int * p,int newf)842 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
843 {
844 struct net *net;
845 int old;
846
847 if (!rtnl_trylock())
848 return restart_syscall();
849
850 net = (struct net *)table->extra2;
851 old = *p;
852 *p = newf;
853
854 if (p == &net->ipv6.devconf_dflt->forwarding) {
855 if ((!newf) ^ (!old))
856 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
857 NETCONFA_FORWARDING,
858 NETCONFA_IFINDEX_DEFAULT,
859 net->ipv6.devconf_dflt);
860 rtnl_unlock();
861 return 0;
862 }
863
864 if (p == &net->ipv6.devconf_all->forwarding) {
865 int old_dflt = net->ipv6.devconf_dflt->forwarding;
866
867 net->ipv6.devconf_dflt->forwarding = newf;
868 if ((!newf) ^ (!old_dflt))
869 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
870 NETCONFA_FORWARDING,
871 NETCONFA_IFINDEX_DEFAULT,
872 net->ipv6.devconf_dflt);
873
874 addrconf_forward_change(net, newf);
875 if ((!newf) ^ (!old))
876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
877 NETCONFA_FORWARDING,
878 NETCONFA_IFINDEX_ALL,
879 net->ipv6.devconf_all);
880 } else if ((!newf) ^ (!old))
881 dev_forward_change((struct inet6_dev *)table->extra1);
882 rtnl_unlock();
883
884 if (newf)
885 rt6_purge_dflt_routers(net);
886 return 1;
887 }
888
addrconf_linkdown_change(struct net * net,__s32 newf)889 static void addrconf_linkdown_change(struct net *net, __s32 newf)
890 {
891 struct net_device *dev;
892 struct inet6_dev *idev;
893
894 for_each_netdev(net, dev) {
895 idev = __in6_dev_get(dev);
896 if (idev) {
897 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
898
899 idev->cnf.ignore_routes_with_linkdown = newf;
900 if (changed)
901 inet6_netconf_notify_devconf(dev_net(dev),
902 RTM_NEWNETCONF,
903 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
904 dev->ifindex,
905 &idev->cnf);
906 }
907 }
908 }
909
addrconf_fixup_linkdown(struct ctl_table * table,int * p,int newf)910 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
911 {
912 struct net *net;
913 int old;
914
915 if (!rtnl_trylock())
916 return restart_syscall();
917
918 net = (struct net *)table->extra2;
919 old = *p;
920 *p = newf;
921
922 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
923 if ((!newf) ^ (!old))
924 inet6_netconf_notify_devconf(net,
925 RTM_NEWNETCONF,
926 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
927 NETCONFA_IFINDEX_DEFAULT,
928 net->ipv6.devconf_dflt);
929 rtnl_unlock();
930 return 0;
931 }
932
933 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
934 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
935 addrconf_linkdown_change(net, newf);
936 if ((!newf) ^ (!old))
937 inet6_netconf_notify_devconf(net,
938 RTM_NEWNETCONF,
939 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
940 NETCONFA_IFINDEX_ALL,
941 net->ipv6.devconf_all);
942 }
943 rtnl_unlock();
944
945 return 1;
946 }
947
948 #endif
949
950 /* Nobody refers to this ifaddr, destroy it */
inet6_ifa_finish_destroy(struct inet6_ifaddr * ifp)951 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
952 {
953 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
954
955 #ifdef NET_REFCNT_DEBUG
956 pr_debug("%s\n", __func__);
957 #endif
958
959 in6_dev_put(ifp->idev);
960
961 if (cancel_delayed_work(&ifp->dad_work))
962 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
963 ifp);
964
965 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
966 pr_warn("Freeing alive inet6 address %p\n", ifp);
967 return;
968 }
969
970 kfree_rcu(ifp, rcu);
971 }
972
973 static void
ipv6_link_dev_addr(struct inet6_dev * idev,struct inet6_ifaddr * ifp)974 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
975 {
976 struct list_head *p;
977 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
978
979 /*
980 * Each device address list is sorted in order of scope -
981 * global before linklocal.
982 */
983 list_for_each(p, &idev->addr_list) {
984 struct inet6_ifaddr *ifa
985 = list_entry(p, struct inet6_ifaddr, if_list);
986 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
987 break;
988 }
989
990 list_add_tail_rcu(&ifp->if_list, p);
991 }
992
inet6_addr_hash(const struct net * net,const struct in6_addr * addr)993 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
994 {
995 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
996
997 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
998 }
999
ipv6_chk_same_addr(struct net * net,const struct in6_addr * addr,struct net_device * dev,unsigned int hash)1000 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1001 struct net_device *dev, unsigned int hash)
1002 {
1003 struct inet6_ifaddr *ifp;
1004
1005 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1006 if (!net_eq(dev_net(ifp->idev->dev), net))
1007 continue;
1008 if (ipv6_addr_equal(&ifp->addr, addr)) {
1009 if (!dev || ifp->idev->dev == dev)
1010 return true;
1011 }
1012 }
1013 return false;
1014 }
1015
ipv6_add_addr_hash(struct net_device * dev,struct inet6_ifaddr * ifa)1016 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1017 {
1018 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1019 int err = 0;
1020
1021 spin_lock(&addrconf_hash_lock);
1022
1023 /* Ignore adding duplicate addresses on an interface */
1024 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1025 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1026 err = -EEXIST;
1027 } else {
1028 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1029 }
1030
1031 spin_unlock(&addrconf_hash_lock);
1032
1033 return err;
1034 }
1035
1036 /* On success it returns ifp with increased reference count */
1037
1038 static struct inet6_ifaddr *
ipv6_add_addr(struct inet6_dev * idev,struct ifa6_config * cfg,bool can_block,struct netlink_ext_ack * extack)1039 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1040 bool can_block, struct netlink_ext_ack *extack)
1041 {
1042 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1043 int addr_type = ipv6_addr_type(cfg->pfx);
1044 struct net *net = dev_net(idev->dev);
1045 struct inet6_ifaddr *ifa = NULL;
1046 struct fib6_info *f6i = NULL;
1047 int err = 0;
1048
1049 if (addr_type == IPV6_ADDR_ANY ||
1050 (addr_type & IPV6_ADDR_MULTICAST &&
1051 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1052 (!(idev->dev->flags & IFF_LOOPBACK) &&
1053 !netif_is_l3_master(idev->dev) &&
1054 addr_type & IPV6_ADDR_LOOPBACK))
1055 return ERR_PTR(-EADDRNOTAVAIL);
1056
1057 if (idev->dead) {
1058 err = -ENODEV; /*XXX*/
1059 goto out;
1060 }
1061
1062 if (idev->cnf.disable_ipv6) {
1063 err = -EACCES;
1064 goto out;
1065 }
1066
1067 /* validator notifier needs to be blocking;
1068 * do not call in atomic context
1069 */
1070 if (can_block) {
1071 struct in6_validator_info i6vi = {
1072 .i6vi_addr = *cfg->pfx,
1073 .i6vi_dev = idev,
1074 .extack = extack,
1075 };
1076
1077 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1078 err = notifier_to_errno(err);
1079 if (err < 0)
1080 goto out;
1081 }
1082
1083 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1084 if (!ifa) {
1085 err = -ENOBUFS;
1086 goto out;
1087 }
1088
1089 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1090 if (IS_ERR(f6i)) {
1091 err = PTR_ERR(f6i);
1092 f6i = NULL;
1093 goto out;
1094 }
1095
1096 if (net->ipv6.devconf_all->disable_policy ||
1097 idev->cnf.disable_policy)
1098 f6i->dst_nopolicy = true;
1099
1100 neigh_parms_data_state_setall(idev->nd_parms);
1101
1102 ifa->addr = *cfg->pfx;
1103 if (cfg->peer_pfx)
1104 ifa->peer_addr = *cfg->peer_pfx;
1105
1106 spin_lock_init(&ifa->lock);
1107 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1108 INIT_HLIST_NODE(&ifa->addr_lst);
1109 ifa->scope = cfg->scope;
1110 ifa->prefix_len = cfg->plen;
1111 ifa->rt_priority = cfg->rt_priority;
1112 ifa->flags = cfg->ifa_flags;
1113 /* No need to add the TENTATIVE flag for addresses with NODAD */
1114 if (!(cfg->ifa_flags & IFA_F_NODAD))
1115 ifa->flags |= IFA_F_TENTATIVE;
1116 ifa->valid_lft = cfg->valid_lft;
1117 ifa->prefered_lft = cfg->preferred_lft;
1118 ifa->cstamp = ifa->tstamp = jiffies;
1119 ifa->tokenized = false;
1120
1121 ifa->rt = f6i;
1122
1123 ifa->idev = idev;
1124 in6_dev_hold(idev);
1125
1126 /* For caller */
1127 refcount_set(&ifa->refcnt, 1);
1128
1129 rcu_read_lock_bh();
1130
1131 err = ipv6_add_addr_hash(idev->dev, ifa);
1132 if (err < 0) {
1133 rcu_read_unlock_bh();
1134 goto out;
1135 }
1136
1137 write_lock(&idev->lock);
1138
1139 /* Add to inet6_dev unicast addr list. */
1140 ipv6_link_dev_addr(idev, ifa);
1141
1142 if (ifa->flags&IFA_F_TEMPORARY) {
1143 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1144 in6_ifa_hold(ifa);
1145 }
1146
1147 in6_ifa_hold(ifa);
1148 write_unlock(&idev->lock);
1149
1150 rcu_read_unlock_bh();
1151
1152 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1153 out:
1154 if (unlikely(err < 0)) {
1155 fib6_info_release(f6i);
1156
1157 if (ifa) {
1158 if (ifa->idev)
1159 in6_dev_put(ifa->idev);
1160 kfree(ifa);
1161 }
1162 ifa = ERR_PTR(err);
1163 }
1164
1165 return ifa;
1166 }
1167
1168 enum cleanup_prefix_rt_t {
1169 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1170 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1171 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1172 };
1173
1174 /*
1175 * Check, whether the prefix for ifp would still need a prefix route
1176 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1177 * constants.
1178 *
1179 * 1) we don't purge prefix if address was not permanent.
1180 * prefix is managed by its own lifetime.
1181 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1182 * 3) if there are no addresses, delete prefix.
1183 * 4) if there are still other permanent address(es),
1184 * corresponding prefix is still permanent.
1185 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1186 * don't purge the prefix, assume user space is managing it.
1187 * 6) otherwise, update prefix lifetime to the
1188 * longest valid lifetime among the corresponding
1189 * addresses on the device.
1190 * Note: subsequent RA will update lifetime.
1191 **/
1192 static enum cleanup_prefix_rt_t
check_cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long * expires)1193 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1194 {
1195 struct inet6_ifaddr *ifa;
1196 struct inet6_dev *idev = ifp->idev;
1197 unsigned long lifetime;
1198 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1199
1200 *expires = jiffies;
1201
1202 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1203 if (ifa == ifp)
1204 continue;
1205 if (ifa->prefix_len != ifp->prefix_len ||
1206 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1207 ifp->prefix_len))
1208 continue;
1209 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1210 return CLEANUP_PREFIX_RT_NOP;
1211
1212 action = CLEANUP_PREFIX_RT_EXPIRE;
1213
1214 spin_lock(&ifa->lock);
1215
1216 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1217 /*
1218 * Note: Because this address is
1219 * not permanent, lifetime <
1220 * LONG_MAX / HZ here.
1221 */
1222 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1223 *expires = ifa->tstamp + lifetime * HZ;
1224 spin_unlock(&ifa->lock);
1225 }
1226
1227 return action;
1228 }
1229
1230 static void
cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,bool del_rt)1231 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1232 {
1233 struct fib6_info *f6i;
1234
1235 f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len,
1236 ifp->idev->dev, 0, RTF_DEFAULT, true);
1237 if (f6i) {
1238 if (del_rt)
1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1240 else {
1241 if (!(f6i->fib6_flags & RTF_EXPIRES))
1242 fib6_set_expires(f6i, expires);
1243 fib6_info_release(f6i);
1244 }
1245 }
1246 }
1247
1248
1249 /* This function wants to get referenced ifp and releases it before return */
1250
ipv6_del_addr(struct inet6_ifaddr * ifp)1251 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1252 {
1253 int state;
1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1255 unsigned long expires;
1256
1257 ASSERT_RTNL();
1258
1259 spin_lock_bh(&ifp->lock);
1260 state = ifp->state;
1261 ifp->state = INET6_IFADDR_STATE_DEAD;
1262 spin_unlock_bh(&ifp->lock);
1263
1264 if (state == INET6_IFADDR_STATE_DEAD)
1265 goto out;
1266
1267 spin_lock_bh(&addrconf_hash_lock);
1268 hlist_del_init_rcu(&ifp->addr_lst);
1269 spin_unlock_bh(&addrconf_hash_lock);
1270
1271 write_lock_bh(&ifp->idev->lock);
1272
1273 if (ifp->flags&IFA_F_TEMPORARY) {
1274 list_del(&ifp->tmp_list);
1275 if (ifp->ifpub) {
1276 in6_ifa_put(ifp->ifpub);
1277 ifp->ifpub = NULL;
1278 }
1279 __in6_ifa_put(ifp);
1280 }
1281
1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1283 action = check_cleanup_prefix_route(ifp, &expires);
1284
1285 list_del_rcu(&ifp->if_list);
1286 __in6_ifa_put(ifp);
1287
1288 write_unlock_bh(&ifp->idev->lock);
1289
1290 addrconf_del_dad_work(ifp);
1291
1292 ipv6_ifa_notify(RTM_DELADDR, ifp);
1293
1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1295
1296 if (action != CLEANUP_PREFIX_RT_NOP) {
1297 cleanup_prefix_route(ifp, expires,
1298 action == CLEANUP_PREFIX_RT_DEL);
1299 }
1300
1301 /* clean up prefsrc entries */
1302 rt6_remove_prefsrc(ifp);
1303 out:
1304 in6_ifa_put(ifp);
1305 }
1306
ipv6_create_tempaddr(struct inet6_ifaddr * ifp,struct inet6_ifaddr * ift,bool block)1307 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1308 struct inet6_ifaddr *ift,
1309 bool block)
1310 {
1311 struct inet6_dev *idev = ifp->idev;
1312 struct in6_addr addr, *tmpaddr;
1313 unsigned long tmp_tstamp, age;
1314 unsigned long regen_advance;
1315 struct ifa6_config cfg;
1316 int ret = 0;
1317 unsigned long now = jiffies;
1318 long max_desync_factor;
1319 s32 cnf_temp_preferred_lft;
1320
1321 write_lock_bh(&idev->lock);
1322 if (ift) {
1323 spin_lock_bh(&ift->lock);
1324 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1325 spin_unlock_bh(&ift->lock);
1326 tmpaddr = &addr;
1327 } else {
1328 tmpaddr = NULL;
1329 }
1330 retry:
1331 in6_dev_hold(idev);
1332 if (idev->cnf.use_tempaddr <= 0) {
1333 write_unlock_bh(&idev->lock);
1334 pr_info("%s: use_tempaddr is disabled\n", __func__);
1335 in6_dev_put(idev);
1336 ret = -1;
1337 goto out;
1338 }
1339 spin_lock_bh(&ifp->lock);
1340 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1341 idev->cnf.use_tempaddr = -1; /*XXX*/
1342 spin_unlock_bh(&ifp->lock);
1343 write_unlock_bh(&idev->lock);
1344 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1345 __func__);
1346 in6_dev_put(idev);
1347 ret = -1;
1348 goto out;
1349 }
1350 in6_ifa_hold(ifp);
1351 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1352 ipv6_try_regen_rndid(idev, tmpaddr);
1353 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1354 age = (now - ifp->tstamp) / HZ;
1355
1356 regen_advance = idev->cnf.regen_max_retry *
1357 idev->cnf.dad_transmits *
1358 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1359
1360 /* recalculate max_desync_factor each time and update
1361 * idev->desync_factor if it's larger
1362 */
1363 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1364 max_desync_factor = min_t(__u32,
1365 idev->cnf.max_desync_factor,
1366 cnf_temp_preferred_lft - regen_advance);
1367
1368 if (unlikely(idev->desync_factor > max_desync_factor)) {
1369 if (max_desync_factor > 0) {
1370 get_random_bytes(&idev->desync_factor,
1371 sizeof(idev->desync_factor));
1372 idev->desync_factor %= max_desync_factor;
1373 } else {
1374 idev->desync_factor = 0;
1375 }
1376 }
1377
1378 memset(&cfg, 0, sizeof(cfg));
1379 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1380 idev->cnf.temp_valid_lft + age);
1381 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1382 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1383
1384 cfg.plen = ifp->prefix_len;
1385 tmp_tstamp = ifp->tstamp;
1386 spin_unlock_bh(&ifp->lock);
1387
1388 write_unlock_bh(&idev->lock);
1389
1390 /* A temporary address is created only if this calculated Preferred
1391 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1392 * an implementation must not create a temporary address with a zero
1393 * Preferred Lifetime.
1394 * Use age calculation as in addrconf_verify to avoid unnecessary
1395 * temporary addresses being generated.
1396 */
1397 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1398 if (cfg.preferred_lft <= regen_advance + age) {
1399 in6_ifa_put(ifp);
1400 in6_dev_put(idev);
1401 ret = -1;
1402 goto out;
1403 }
1404
1405 cfg.ifa_flags = IFA_F_TEMPORARY;
1406 /* set in addrconf_prefix_rcv() */
1407 if (ifp->flags & IFA_F_OPTIMISTIC)
1408 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1409
1410 cfg.pfx = &addr;
1411 cfg.scope = ipv6_addr_scope(cfg.pfx);
1412
1413 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1414 if (IS_ERR(ift)) {
1415 in6_ifa_put(ifp);
1416 in6_dev_put(idev);
1417 pr_info("%s: retry temporary address regeneration\n", __func__);
1418 tmpaddr = &addr;
1419 write_lock_bh(&idev->lock);
1420 goto retry;
1421 }
1422
1423 spin_lock_bh(&ift->lock);
1424 ift->ifpub = ifp;
1425 ift->cstamp = now;
1426 ift->tstamp = tmp_tstamp;
1427 spin_unlock_bh(&ift->lock);
1428
1429 addrconf_dad_start(ift);
1430 in6_ifa_put(ift);
1431 in6_dev_put(idev);
1432 out:
1433 return ret;
1434 }
1435
1436 /*
1437 * Choose an appropriate source address (RFC3484)
1438 */
1439 enum {
1440 IPV6_SADDR_RULE_INIT = 0,
1441 IPV6_SADDR_RULE_LOCAL,
1442 IPV6_SADDR_RULE_SCOPE,
1443 IPV6_SADDR_RULE_PREFERRED,
1444 #ifdef CONFIG_IPV6_MIP6
1445 IPV6_SADDR_RULE_HOA,
1446 #endif
1447 IPV6_SADDR_RULE_OIF,
1448 IPV6_SADDR_RULE_LABEL,
1449 IPV6_SADDR_RULE_PRIVACY,
1450 IPV6_SADDR_RULE_ORCHID,
1451 IPV6_SADDR_RULE_PREFIX,
1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1454 #endif
1455 IPV6_SADDR_RULE_MAX
1456 };
1457
1458 struct ipv6_saddr_score {
1459 int rule;
1460 int addr_type;
1461 struct inet6_ifaddr *ifa;
1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1463 int scopedist;
1464 int matchlen;
1465 };
1466
1467 struct ipv6_saddr_dst {
1468 const struct in6_addr *addr;
1469 int ifindex;
1470 int scope;
1471 int label;
1472 unsigned int prefs;
1473 };
1474
ipv6_saddr_preferred(int type)1475 static inline int ipv6_saddr_preferred(int type)
1476 {
1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1478 return 1;
1479 return 0;
1480 }
1481
ipv6_use_optimistic_addr(struct net * net,struct inet6_dev * idev)1482 static bool ipv6_use_optimistic_addr(struct net *net,
1483 struct inet6_dev *idev)
1484 {
1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1486 if (!idev)
1487 return false;
1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1489 return false;
1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1491 return false;
1492
1493 return true;
1494 #else
1495 return false;
1496 #endif
1497 }
1498
ipv6_allow_optimistic_dad(struct net * net,struct inet6_dev * idev)1499 static bool ipv6_allow_optimistic_dad(struct net *net,
1500 struct inet6_dev *idev)
1501 {
1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1503 if (!idev)
1504 return false;
1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1506 return false;
1507
1508 return true;
1509 #else
1510 return false;
1511 #endif
1512 }
1513
ipv6_get_saddr_eval(struct net * net,struct ipv6_saddr_score * score,struct ipv6_saddr_dst * dst,int i)1514 static int ipv6_get_saddr_eval(struct net *net,
1515 struct ipv6_saddr_score *score,
1516 struct ipv6_saddr_dst *dst,
1517 int i)
1518 {
1519 int ret;
1520
1521 if (i <= score->rule) {
1522 switch (i) {
1523 case IPV6_SADDR_RULE_SCOPE:
1524 ret = score->scopedist;
1525 break;
1526 case IPV6_SADDR_RULE_PREFIX:
1527 ret = score->matchlen;
1528 break;
1529 default:
1530 ret = !!test_bit(i, score->scorebits);
1531 }
1532 goto out;
1533 }
1534
1535 switch (i) {
1536 case IPV6_SADDR_RULE_INIT:
1537 /* Rule 0: remember if hiscore is not ready yet */
1538 ret = !!score->ifa;
1539 break;
1540 case IPV6_SADDR_RULE_LOCAL:
1541 /* Rule 1: Prefer same address */
1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1543 break;
1544 case IPV6_SADDR_RULE_SCOPE:
1545 /* Rule 2: Prefer appropriate scope
1546 *
1547 * ret
1548 * ^
1549 * -1 | d 15
1550 * ---+--+-+---> scope
1551 * |
1552 * | d is scope of the destination.
1553 * B-d | \
1554 * | \ <- smaller scope is better if
1555 * B-15 | \ if scope is enough for destination.
1556 * | ret = B - scope (-1 <= scope >= d <= 15).
1557 * d-C-1 | /
1558 * |/ <- greater is better
1559 * -C / if scope is not enough for destination.
1560 * /| ret = scope - C (-1 <= d < scope <= 15).
1561 *
1562 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1564 * Assume B = 0 and we get C > 29.
1565 */
1566 ret = __ipv6_addr_src_scope(score->addr_type);
1567 if (ret >= dst->scope)
1568 ret = -ret;
1569 else
1570 ret -= 128; /* 30 is enough */
1571 score->scopedist = ret;
1572 break;
1573 case IPV6_SADDR_RULE_PREFERRED:
1574 {
1575 /* Rule 3: Avoid deprecated and optimistic addresses */
1576 u8 avoid = IFA_F_DEPRECATED;
1577
1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1579 avoid |= IFA_F_OPTIMISTIC;
1580 ret = ipv6_saddr_preferred(score->addr_type) ||
1581 !(score->ifa->flags & avoid);
1582 break;
1583 }
1584 #ifdef CONFIG_IPV6_MIP6
1585 case IPV6_SADDR_RULE_HOA:
1586 {
1587 /* Rule 4: Prefer home address */
1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1590 break;
1591 }
1592 #endif
1593 case IPV6_SADDR_RULE_OIF:
1594 /* Rule 5: Prefer outgoing interface */
1595 ret = (!dst->ifindex ||
1596 dst->ifindex == score->ifa->idev->dev->ifindex);
1597 break;
1598 case IPV6_SADDR_RULE_LABEL:
1599 /* Rule 6: Prefer matching label */
1600 ret = ipv6_addr_label(net,
1601 &score->ifa->addr, score->addr_type,
1602 score->ifa->idev->dev->ifindex) == dst->label;
1603 break;
1604 case IPV6_SADDR_RULE_PRIVACY:
1605 {
1606 /* Rule 7: Prefer public address
1607 * Note: prefer temporary address if use_tempaddr >= 2
1608 */
1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1611 score->ifa->idev->cnf.use_tempaddr >= 2;
1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1613 break;
1614 }
1615 case IPV6_SADDR_RULE_ORCHID:
1616 /* Rule 8-: Prefer ORCHID vs ORCHID or
1617 * non-ORCHID vs non-ORCHID
1618 */
1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1620 ipv6_addr_orchid(dst->addr));
1621 break;
1622 case IPV6_SADDR_RULE_PREFIX:
1623 /* Rule 8: Use longest matching prefix */
1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1625 if (ret > score->ifa->prefix_len)
1626 ret = score->ifa->prefix_len;
1627 score->matchlen = ret;
1628 break;
1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1631 /* Optimistic addresses still have lower precedence than other
1632 * preferred addresses.
1633 */
1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1635 break;
1636 #endif
1637 default:
1638 ret = 0;
1639 }
1640
1641 if (ret)
1642 __set_bit(i, score->scorebits);
1643 score->rule = i;
1644 out:
1645 return ret;
1646 }
1647
__ipv6_dev_get_saddr(struct net * net,struct ipv6_saddr_dst * dst,struct inet6_dev * idev,struct ipv6_saddr_score * scores,int hiscore_idx)1648 static int __ipv6_dev_get_saddr(struct net *net,
1649 struct ipv6_saddr_dst *dst,
1650 struct inet6_dev *idev,
1651 struct ipv6_saddr_score *scores,
1652 int hiscore_idx)
1653 {
1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1655
1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1657 int i;
1658
1659 /*
1660 * - Tentative Address (RFC2462 section 5.4)
1661 * - A tentative address is not considered
1662 * "assigned to an interface" in the traditional
1663 * sense, unless it is also flagged as optimistic.
1664 * - Candidate Source Address (section 4)
1665 * - In any case, anycast addresses, multicast
1666 * addresses, and the unspecified address MUST
1667 * NOT be included in a candidate set.
1668 */
1669 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1671 continue;
1672
1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1674
1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1676 score->addr_type & IPV6_ADDR_MULTICAST)) {
1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1678 idev->dev->name);
1679 continue;
1680 }
1681
1682 score->rule = -1;
1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1684
1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1686 int minihiscore, miniscore;
1687
1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1690
1691 if (minihiscore > miniscore) {
1692 if (i == IPV6_SADDR_RULE_SCOPE &&
1693 score->scopedist > 0) {
1694 /*
1695 * special case:
1696 * each remaining entry
1697 * has too small (not enough)
1698 * scope, because ifa entries
1699 * are sorted by their scope
1700 * values.
1701 */
1702 goto out;
1703 }
1704 break;
1705 } else if (minihiscore < miniscore) {
1706 swap(hiscore, score);
1707 hiscore_idx = 1 - hiscore_idx;
1708
1709 /* restore our iterator */
1710 score->ifa = hiscore->ifa;
1711
1712 break;
1713 }
1714 }
1715 }
1716 out:
1717 return hiscore_idx;
1718 }
1719
ipv6_get_saddr_master(struct net * net,const struct net_device * dst_dev,const struct net_device * master,struct ipv6_saddr_dst * dst,struct ipv6_saddr_score * scores,int hiscore_idx)1720 static int ipv6_get_saddr_master(struct net *net,
1721 const struct net_device *dst_dev,
1722 const struct net_device *master,
1723 struct ipv6_saddr_dst *dst,
1724 struct ipv6_saddr_score *scores,
1725 int hiscore_idx)
1726 {
1727 struct inet6_dev *idev;
1728
1729 idev = __in6_dev_get(dst_dev);
1730 if (idev)
1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1732 scores, hiscore_idx);
1733
1734 idev = __in6_dev_get(master);
1735 if (idev)
1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1737 scores, hiscore_idx);
1738
1739 return hiscore_idx;
1740 }
1741
ipv6_dev_get_saddr(struct net * net,const struct net_device * dst_dev,const struct in6_addr * daddr,unsigned int prefs,struct in6_addr * saddr)1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1743 const struct in6_addr *daddr, unsigned int prefs,
1744 struct in6_addr *saddr)
1745 {
1746 struct ipv6_saddr_score scores[2], *hiscore;
1747 struct ipv6_saddr_dst dst;
1748 struct inet6_dev *idev;
1749 struct net_device *dev;
1750 int dst_type;
1751 bool use_oif_addr = false;
1752 int hiscore_idx = 0;
1753 int ret = 0;
1754
1755 dst_type = __ipv6_addr_type(daddr);
1756 dst.addr = daddr;
1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1758 dst.scope = __ipv6_addr_src_scope(dst_type);
1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1760 dst.prefs = prefs;
1761
1762 scores[hiscore_idx].rule = -1;
1763 scores[hiscore_idx].ifa = NULL;
1764
1765 rcu_read_lock();
1766
1767 /* Candidate Source Address (section 4)
1768 * - multicast and link-local destination address,
1769 * the set of candidate source address MUST only
1770 * include addresses assigned to interfaces
1771 * belonging to the same link as the outgoing
1772 * interface.
1773 * (- For site-local destination addresses, the
1774 * set of candidate source addresses MUST only
1775 * include addresses assigned to interfaces
1776 * belonging to the same site as the outgoing
1777 * interface.)
1778 * - "It is RECOMMENDED that the candidate source addresses
1779 * be the set of unicast addresses assigned to the
1780 * interface that will be used to send to the destination
1781 * (the 'outgoing' interface)." (RFC 6724)
1782 */
1783 if (dst_dev) {
1784 idev = __in6_dev_get(dst_dev);
1785 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1787 (idev && idev->cnf.use_oif_addrs_only)) {
1788 use_oif_addr = true;
1789 }
1790 }
1791
1792 if (use_oif_addr) {
1793 if (idev)
1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1795 } else {
1796 const struct net_device *master;
1797 int master_idx = 0;
1798
1799 /* if dst_dev exists and is enslaved to an L3 device, then
1800 * prefer addresses from dst_dev and then the master over
1801 * any other enslaved devices in the L3 domain.
1802 */
1803 master = l3mdev_master_dev_rcu(dst_dev);
1804 if (master) {
1805 master_idx = master->ifindex;
1806
1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1808 master, &dst,
1809 scores, hiscore_idx);
1810
1811 if (scores[hiscore_idx].ifa)
1812 goto out;
1813 }
1814
1815 for_each_netdev_rcu(net, dev) {
1816 /* only consider addresses on devices in the
1817 * same L3 domain
1818 */
1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1820 continue;
1821 idev = __in6_dev_get(dev);
1822 if (!idev)
1823 continue;
1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1825 }
1826 }
1827
1828 out:
1829 hiscore = &scores[hiscore_idx];
1830 if (!hiscore->ifa)
1831 ret = -EADDRNOTAVAIL;
1832 else
1833 *saddr = hiscore->ifa->addr;
1834
1835 rcu_read_unlock();
1836 return ret;
1837 }
1838 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1839
__ipv6_get_lladdr(struct inet6_dev * idev,struct in6_addr * addr,u32 banned_flags)1840 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1841 u32 banned_flags)
1842 {
1843 struct inet6_ifaddr *ifp;
1844 int err = -EADDRNOTAVAIL;
1845
1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1847 if (ifp->scope > IFA_LINK)
1848 break;
1849 if (ifp->scope == IFA_LINK &&
1850 !(ifp->flags & banned_flags)) {
1851 *addr = ifp->addr;
1852 err = 0;
1853 break;
1854 }
1855 }
1856 return err;
1857 }
1858
ipv6_get_lladdr(struct net_device * dev,struct in6_addr * addr,u32 banned_flags)1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1860 u32 banned_flags)
1861 {
1862 struct inet6_dev *idev;
1863 int err = -EADDRNOTAVAIL;
1864
1865 rcu_read_lock();
1866 idev = __in6_dev_get(dev);
1867 if (idev) {
1868 read_lock_bh(&idev->lock);
1869 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1870 read_unlock_bh(&idev->lock);
1871 }
1872 rcu_read_unlock();
1873 return err;
1874 }
1875
ipv6_count_addresses(const struct inet6_dev * idev)1876 static int ipv6_count_addresses(const struct inet6_dev *idev)
1877 {
1878 const struct inet6_ifaddr *ifp;
1879 int cnt = 0;
1880
1881 rcu_read_lock();
1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1883 cnt++;
1884 rcu_read_unlock();
1885 return cnt;
1886 }
1887
ipv6_chk_addr(struct net * net,const struct in6_addr * addr,const struct net_device * dev,int strict)1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1889 const struct net_device *dev, int strict)
1890 {
1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1892 strict, IFA_F_TENTATIVE);
1893 }
1894 EXPORT_SYMBOL(ipv6_chk_addr);
1895
1896 /* device argument is used to find the L3 domain of interest. If
1897 * skip_dev_check is set, then the ifp device is not checked against
1898 * the passed in dev argument. So the 2 cases for addresses checks are:
1899 * 1. does the address exist in the L3 domain that dev is part of
1900 * (skip_dev_check = true), or
1901 *
1902 * 2. does the address exist on the specific device
1903 * (skip_dev_check = false)
1904 */
ipv6_chk_addr_and_flags(struct net * net,const struct in6_addr * addr,const struct net_device * dev,bool skip_dev_check,int strict,u32 banned_flags)1905 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1906 const struct net_device *dev, bool skip_dev_check,
1907 int strict, u32 banned_flags)
1908 {
1909 unsigned int hash = inet6_addr_hash(net, addr);
1910 const struct net_device *l3mdev;
1911 struct inet6_ifaddr *ifp;
1912 u32 ifp_flags;
1913
1914 rcu_read_lock();
1915
1916 l3mdev = l3mdev_master_dev_rcu(dev);
1917 if (skip_dev_check)
1918 dev = NULL;
1919
1920 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1921 if (!net_eq(dev_net(ifp->idev->dev), net))
1922 continue;
1923
1924 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1925 continue;
1926
1927 /* Decouple optimistic from tentative for evaluation here.
1928 * Ban optimistic addresses explicitly, when required.
1929 */
1930 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1931 ? (ifp->flags&~IFA_F_TENTATIVE)
1932 : ifp->flags;
1933 if (ipv6_addr_equal(&ifp->addr, addr) &&
1934 !(ifp_flags&banned_flags) &&
1935 (!dev || ifp->idev->dev == dev ||
1936 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1937 rcu_read_unlock();
1938 return 1;
1939 }
1940 }
1941
1942 rcu_read_unlock();
1943 return 0;
1944 }
1945 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1946
1947
1948 /* Compares an address/prefix_len with addresses on device @dev.
1949 * If one is found it returns true.
1950 */
ipv6_chk_custom_prefix(const struct in6_addr * addr,const unsigned int prefix_len,struct net_device * dev)1951 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1952 const unsigned int prefix_len, struct net_device *dev)
1953 {
1954 const struct inet6_ifaddr *ifa;
1955 const struct inet6_dev *idev;
1956 bool ret = false;
1957
1958 rcu_read_lock();
1959 idev = __in6_dev_get(dev);
1960 if (idev) {
1961 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1962 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1963 if (ret)
1964 break;
1965 }
1966 }
1967 rcu_read_unlock();
1968
1969 return ret;
1970 }
1971 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1972
ipv6_chk_prefix(const struct in6_addr * addr,struct net_device * dev)1973 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1974 {
1975 const struct inet6_ifaddr *ifa;
1976 const struct inet6_dev *idev;
1977 int onlink;
1978
1979 onlink = 0;
1980 rcu_read_lock();
1981 idev = __in6_dev_get(dev);
1982 if (idev) {
1983 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1984 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1985 ifa->prefix_len);
1986 if (onlink)
1987 break;
1988 }
1989 }
1990 rcu_read_unlock();
1991 return onlink;
1992 }
1993 EXPORT_SYMBOL(ipv6_chk_prefix);
1994
ipv6_get_ifaddr(struct net * net,const struct in6_addr * addr,struct net_device * dev,int strict)1995 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1996 struct net_device *dev, int strict)
1997 {
1998 unsigned int hash = inet6_addr_hash(net, addr);
1999 struct inet6_ifaddr *ifp, *result = NULL;
2000
2001 rcu_read_lock();
2002 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2003 if (!net_eq(dev_net(ifp->idev->dev), net))
2004 continue;
2005 if (ipv6_addr_equal(&ifp->addr, addr)) {
2006 if (!dev || ifp->idev->dev == dev ||
2007 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2008 result = ifp;
2009 in6_ifa_hold(ifp);
2010 break;
2011 }
2012 }
2013 }
2014 rcu_read_unlock();
2015
2016 return result;
2017 }
2018
2019 /* Gets referenced address, destroys ifaddr */
2020
addrconf_dad_stop(struct inet6_ifaddr * ifp,int dad_failed)2021 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2022 {
2023 if (dad_failed)
2024 ifp->flags |= IFA_F_DADFAILED;
2025
2026 if (ifp->flags&IFA_F_TEMPORARY) {
2027 struct inet6_ifaddr *ifpub;
2028 spin_lock_bh(&ifp->lock);
2029 ifpub = ifp->ifpub;
2030 if (ifpub) {
2031 in6_ifa_hold(ifpub);
2032 spin_unlock_bh(&ifp->lock);
2033 ipv6_create_tempaddr(ifpub, ifp, true);
2034 in6_ifa_put(ifpub);
2035 } else {
2036 spin_unlock_bh(&ifp->lock);
2037 }
2038 ipv6_del_addr(ifp);
2039 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2040 spin_lock_bh(&ifp->lock);
2041 addrconf_del_dad_work(ifp);
2042 ifp->flags |= IFA_F_TENTATIVE;
2043 if (dad_failed)
2044 ifp->flags &= ~IFA_F_OPTIMISTIC;
2045 spin_unlock_bh(&ifp->lock);
2046 if (dad_failed)
2047 ipv6_ifa_notify(0, ifp);
2048 in6_ifa_put(ifp);
2049 } else {
2050 ipv6_del_addr(ifp);
2051 }
2052 }
2053
addrconf_dad_end(struct inet6_ifaddr * ifp)2054 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2055 {
2056 int err = -ENOENT;
2057
2058 spin_lock_bh(&ifp->lock);
2059 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2060 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2061 err = 0;
2062 }
2063 spin_unlock_bh(&ifp->lock);
2064
2065 return err;
2066 }
2067
addrconf_dad_failure(struct sk_buff * skb,struct inet6_ifaddr * ifp)2068 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2069 {
2070 struct inet6_dev *idev = ifp->idev;
2071 struct net *net = dev_net(ifp->idev->dev);
2072
2073 if (addrconf_dad_end(ifp)) {
2074 in6_ifa_put(ifp);
2075 return;
2076 }
2077
2078 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2079 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2080
2081 spin_lock_bh(&ifp->lock);
2082
2083 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2084 struct in6_addr new_addr;
2085 struct inet6_ifaddr *ifp2;
2086 int retries = ifp->stable_privacy_retry + 1;
2087 struct ifa6_config cfg = {
2088 .pfx = &new_addr,
2089 .plen = ifp->prefix_len,
2090 .ifa_flags = ifp->flags,
2091 .valid_lft = ifp->valid_lft,
2092 .preferred_lft = ifp->prefered_lft,
2093 .scope = ifp->scope,
2094 };
2095
2096 if (retries > net->ipv6.sysctl.idgen_retries) {
2097 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2098 ifp->idev->dev->name);
2099 goto errdad;
2100 }
2101
2102 new_addr = ifp->addr;
2103 if (ipv6_generate_stable_address(&new_addr, retries,
2104 idev))
2105 goto errdad;
2106
2107 spin_unlock_bh(&ifp->lock);
2108
2109 if (idev->cnf.max_addresses &&
2110 ipv6_count_addresses(idev) >=
2111 idev->cnf.max_addresses)
2112 goto lock_errdad;
2113
2114 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2115 ifp->idev->dev->name);
2116
2117 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2118 if (IS_ERR(ifp2))
2119 goto lock_errdad;
2120
2121 spin_lock_bh(&ifp2->lock);
2122 ifp2->stable_privacy_retry = retries;
2123 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2124 spin_unlock_bh(&ifp2->lock);
2125
2126 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2127 in6_ifa_put(ifp2);
2128 lock_errdad:
2129 spin_lock_bh(&ifp->lock);
2130 }
2131
2132 errdad:
2133 /* transition from _POSTDAD to _ERRDAD */
2134 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2135 spin_unlock_bh(&ifp->lock);
2136
2137 addrconf_mod_dad_work(ifp, 0);
2138 in6_ifa_put(ifp);
2139 }
2140
2141 /* Join to solicited addr multicast group.
2142 * caller must hold RTNL */
addrconf_join_solict(struct net_device * dev,const struct in6_addr * addr)2143 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2144 {
2145 struct in6_addr maddr;
2146
2147 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2148 return;
2149
2150 addrconf_addr_solict_mult(addr, &maddr);
2151 ipv6_dev_mc_inc(dev, &maddr);
2152 }
2153
2154 /* caller must hold RTNL */
addrconf_leave_solict(struct inet6_dev * idev,const struct in6_addr * addr)2155 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2156 {
2157 struct in6_addr maddr;
2158
2159 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2160 return;
2161
2162 addrconf_addr_solict_mult(addr, &maddr);
2163 __ipv6_dev_mc_dec(idev, &maddr);
2164 }
2165
2166 /* caller must hold RTNL */
addrconf_join_anycast(struct inet6_ifaddr * ifp)2167 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2168 {
2169 struct in6_addr addr;
2170
2171 if (ifp->prefix_len >= 127) /* RFC 6164 */
2172 return;
2173 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2174 if (ipv6_addr_any(&addr))
2175 return;
2176 __ipv6_dev_ac_inc(ifp->idev, &addr);
2177 }
2178
2179 /* caller must hold RTNL */
addrconf_leave_anycast(struct inet6_ifaddr * ifp)2180 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2181 {
2182 struct in6_addr addr;
2183
2184 if (ifp->prefix_len >= 127) /* RFC 6164 */
2185 return;
2186 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2187 if (ipv6_addr_any(&addr))
2188 return;
2189 __ipv6_dev_ac_dec(ifp->idev, &addr);
2190 }
2191
addrconf_ifid_6lowpan(u8 * eui,struct net_device * dev)2192 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2193 {
2194 switch (dev->addr_len) {
2195 case ETH_ALEN:
2196 memcpy(eui, dev->dev_addr, 3);
2197 eui[3] = 0xFF;
2198 eui[4] = 0xFE;
2199 memcpy(eui + 5, dev->dev_addr + 3, 3);
2200 break;
2201 case EUI64_ADDR_LEN:
2202 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2203 eui[0] ^= 2;
2204 break;
2205 default:
2206 return -1;
2207 }
2208
2209 return 0;
2210 }
2211
addrconf_ifid_ieee1394(u8 * eui,struct net_device * dev)2212 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2213 {
2214 union fwnet_hwaddr *ha;
2215
2216 if (dev->addr_len != FWNET_ALEN)
2217 return -1;
2218
2219 ha = (union fwnet_hwaddr *)dev->dev_addr;
2220
2221 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2222 eui[0] ^= 2;
2223 return 0;
2224 }
2225
addrconf_ifid_arcnet(u8 * eui,struct net_device * dev)2226 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2227 {
2228 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2229 if (dev->addr_len != ARCNET_ALEN)
2230 return -1;
2231 memset(eui, 0, 7);
2232 eui[7] = *(u8 *)dev->dev_addr;
2233 return 0;
2234 }
2235
addrconf_ifid_infiniband(u8 * eui,struct net_device * dev)2236 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2237 {
2238 if (dev->addr_len != INFINIBAND_ALEN)
2239 return -1;
2240 memcpy(eui, dev->dev_addr + 12, 8);
2241 eui[0] |= 2;
2242 return 0;
2243 }
2244
__ipv6_isatap_ifid(u8 * eui,__be32 addr)2245 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2246 {
2247 if (addr == 0)
2248 return -1;
2249 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2250 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2251 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2252 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2253 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2254 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2255 eui[1] = 0;
2256 eui[2] = 0x5E;
2257 eui[3] = 0xFE;
2258 memcpy(eui + 4, &addr, 4);
2259 return 0;
2260 }
2261
addrconf_ifid_sit(u8 * eui,struct net_device * dev)2262 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2263 {
2264 if (dev->priv_flags & IFF_ISATAP)
2265 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2266 return -1;
2267 }
2268
addrconf_ifid_gre(u8 * eui,struct net_device * dev)2269 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2270 {
2271 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2272 }
2273
addrconf_ifid_ip6tnl(u8 * eui,struct net_device * dev)2274 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2275 {
2276 memcpy(eui, dev->perm_addr, 3);
2277 memcpy(eui + 5, dev->perm_addr + 3, 3);
2278 eui[3] = 0xFF;
2279 eui[4] = 0xFE;
2280 eui[0] ^= 2;
2281 return 0;
2282 }
2283
ipv6_generate_eui64(u8 * eui,struct net_device * dev)2284 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2285 {
2286 switch (dev->type) {
2287 case ARPHRD_ETHER:
2288 case ARPHRD_FDDI:
2289 return addrconf_ifid_eui48(eui, dev);
2290 case ARPHRD_ARCNET:
2291 return addrconf_ifid_arcnet(eui, dev);
2292 case ARPHRD_INFINIBAND:
2293 return addrconf_ifid_infiniband(eui, dev);
2294 case ARPHRD_SIT:
2295 return addrconf_ifid_sit(eui, dev);
2296 case ARPHRD_IPGRE:
2297 case ARPHRD_TUNNEL:
2298 return addrconf_ifid_gre(eui, dev);
2299 case ARPHRD_6LOWPAN:
2300 return addrconf_ifid_6lowpan(eui, dev);
2301 case ARPHRD_IEEE1394:
2302 return addrconf_ifid_ieee1394(eui, dev);
2303 case ARPHRD_TUNNEL6:
2304 case ARPHRD_IP6GRE:
2305 case ARPHRD_RAWIP:
2306 return addrconf_ifid_ip6tnl(eui, dev);
2307 }
2308 return -1;
2309 }
2310
ipv6_inherit_eui64(u8 * eui,struct inet6_dev * idev)2311 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2312 {
2313 int err = -1;
2314 struct inet6_ifaddr *ifp;
2315
2316 read_lock_bh(&idev->lock);
2317 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2318 if (ifp->scope > IFA_LINK)
2319 break;
2320 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2321 memcpy(eui, ifp->addr.s6_addr+8, 8);
2322 err = 0;
2323 break;
2324 }
2325 }
2326 read_unlock_bh(&idev->lock);
2327 return err;
2328 }
2329
2330 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
ipv6_regen_rndid(struct inet6_dev * idev)2331 static void ipv6_regen_rndid(struct inet6_dev *idev)
2332 {
2333 regen:
2334 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2335 idev->rndid[0] &= ~0x02;
2336
2337 /*
2338 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2339 * check if generated address is not inappropriate
2340 *
2341 * - Reserved subnet anycast (RFC 2526)
2342 * 11111101 11....11 1xxxxxxx
2343 * - ISATAP (RFC4214) 6.1
2344 * 00-00-5E-FE-xx-xx-xx-xx
2345 * - value 0
2346 * - XXX: already assigned to an address on the device
2347 */
2348 if (idev->rndid[0] == 0xfd &&
2349 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2350 (idev->rndid[7]&0x80))
2351 goto regen;
2352 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2353 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2354 goto regen;
2355 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2356 goto regen;
2357 }
2358 }
2359
ipv6_try_regen_rndid(struct inet6_dev * idev,struct in6_addr * tmpaddr)2360 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2361 {
2362 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2363 ipv6_regen_rndid(idev);
2364 }
2365
addrconf_rt_table(const struct net_device * dev,u32 default_table)2366 u32 addrconf_rt_table(const struct net_device *dev, u32 default_table)
2367 {
2368 struct inet6_dev *idev = in6_dev_get(dev);
2369 int sysctl;
2370 u32 table;
2371
2372 if (!idev)
2373 return default_table;
2374 sysctl = idev->cnf.accept_ra_rt_table;
2375 if (sysctl == 0) {
2376 table = default_table;
2377 } else if (sysctl > 0) {
2378 table = (u32) sysctl;
2379 } else {
2380 table = (unsigned) dev->ifindex + (-sysctl);
2381 }
2382 in6_dev_put(idev);
2383 return table;
2384 }
2385
2386 /*
2387 * Add prefix route.
2388 */
2389
2390 static void
addrconf_prefix_route(struct in6_addr * pfx,int plen,u32 metric,struct net_device * dev,unsigned long expires,u32 flags,gfp_t gfp_flags)2391 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2392 struct net_device *dev, unsigned long expires,
2393 u32 flags, gfp_t gfp_flags)
2394 {
2395 struct fib6_config cfg = {
2396 .fc_table = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_PREFIX),
2397 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2398 .fc_ifindex = dev->ifindex,
2399 .fc_expires = expires,
2400 .fc_dst_len = plen,
2401 .fc_flags = RTF_UP | flags,
2402 .fc_nlinfo.nl_net = dev_net(dev),
2403 .fc_protocol = RTPROT_KERNEL,
2404 .fc_type = RTN_UNICAST,
2405 };
2406
2407 cfg.fc_dst = *pfx;
2408
2409 /* Prevent useless cloning on PtP SIT.
2410 This thing is done here expecting that the whole
2411 class of non-broadcast devices need not cloning.
2412 */
2413 #if IS_ENABLED(CONFIG_IPV6_SIT)
2414 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2415 cfg.fc_flags |= RTF_NONEXTHOP;
2416 #endif
2417
2418 ip6_route_add(&cfg, gfp_flags, NULL);
2419 }
2420
2421
addrconf_get_prefix_route(const struct in6_addr * pfx,int plen,const struct net_device * dev,u32 flags,u32 noflags,bool no_gw)2422 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2423 int plen,
2424 const struct net_device *dev,
2425 u32 flags, u32 noflags,
2426 bool no_gw)
2427 {
2428 struct fib6_node *fn;
2429 struct fib6_info *rt = NULL;
2430 struct fib6_table *table;
2431 u32 tb_id = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_PREFIX);
2432
2433 table = fib6_get_table(dev_net(dev), tb_id);
2434 if (!table)
2435 return NULL;
2436
2437 rcu_read_lock();
2438 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2439 if (!fn)
2440 goto out;
2441
2442 for_each_fib6_node_rt_rcu(fn) {
2443 /* prefix routes only use builtin fib6_nh */
2444 if (rt->nh)
2445 continue;
2446
2447 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2448 continue;
2449 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2450 continue;
2451 if ((rt->fib6_flags & flags) != flags)
2452 continue;
2453 if ((rt->fib6_flags & noflags) != 0)
2454 continue;
2455 if (!fib6_info_hold_safe(rt))
2456 continue;
2457 break;
2458 }
2459 out:
2460 rcu_read_unlock();
2461 return rt;
2462 }
2463
2464
2465 /* Create "default" multicast route to the interface */
2466
addrconf_add_mroute(struct net_device * dev)2467 static void addrconf_add_mroute(struct net_device *dev)
2468 {
2469 struct fib6_config cfg = {
2470 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2471 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2472 .fc_ifindex = dev->ifindex,
2473 .fc_dst_len = 8,
2474 .fc_flags = RTF_UP,
2475 .fc_type = RTN_UNICAST,
2476 .fc_nlinfo.nl_net = dev_net(dev),
2477 };
2478
2479 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2480
2481 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2482 }
2483
addrconf_add_dev(struct net_device * dev)2484 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2485 {
2486 struct inet6_dev *idev;
2487
2488 ASSERT_RTNL();
2489
2490 idev = ipv6_find_idev(dev);
2491 if (IS_ERR(idev))
2492 return idev;
2493
2494 if (idev->cnf.disable_ipv6)
2495 return ERR_PTR(-EACCES);
2496
2497 /* Add default multicast route */
2498 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2499 addrconf_add_mroute(dev);
2500
2501 return idev;
2502 }
2503
manage_tempaddrs(struct inet6_dev * idev,struct inet6_ifaddr * ifp,__u32 valid_lft,__u32 prefered_lft,bool create,unsigned long now)2504 static void manage_tempaddrs(struct inet6_dev *idev,
2505 struct inet6_ifaddr *ifp,
2506 __u32 valid_lft, __u32 prefered_lft,
2507 bool create, unsigned long now)
2508 {
2509 u32 flags;
2510 struct inet6_ifaddr *ift;
2511
2512 read_lock_bh(&idev->lock);
2513 /* update all temporary addresses in the list */
2514 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2515 int age, max_valid, max_prefered;
2516
2517 if (ifp != ift->ifpub)
2518 continue;
2519
2520 /* RFC 4941 section 3.3:
2521 * If a received option will extend the lifetime of a public
2522 * address, the lifetimes of temporary addresses should
2523 * be extended, subject to the overall constraint that no
2524 * temporary addresses should ever remain "valid" or "preferred"
2525 * for a time longer than (TEMP_VALID_LIFETIME) or
2526 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2527 */
2528 age = (now - ift->cstamp) / HZ;
2529 max_valid = idev->cnf.temp_valid_lft - age;
2530 if (max_valid < 0)
2531 max_valid = 0;
2532
2533 max_prefered = idev->cnf.temp_prefered_lft -
2534 idev->desync_factor - age;
2535 if (max_prefered < 0)
2536 max_prefered = 0;
2537
2538 if (valid_lft > max_valid)
2539 valid_lft = max_valid;
2540
2541 if (prefered_lft > max_prefered)
2542 prefered_lft = max_prefered;
2543
2544 spin_lock(&ift->lock);
2545 flags = ift->flags;
2546 ift->valid_lft = valid_lft;
2547 ift->prefered_lft = prefered_lft;
2548 ift->tstamp = now;
2549 if (prefered_lft > 0)
2550 ift->flags &= ~IFA_F_DEPRECATED;
2551
2552 spin_unlock(&ift->lock);
2553 if (!(flags&IFA_F_TENTATIVE))
2554 ipv6_ifa_notify(0, ift);
2555 }
2556
2557 if ((create || list_empty(&idev->tempaddr_list)) &&
2558 idev->cnf.use_tempaddr > 0) {
2559 /* When a new public address is created as described
2560 * in [ADDRCONF], also create a new temporary address.
2561 * Also create a temporary address if it's enabled but
2562 * no temporary address currently exists.
2563 */
2564 read_unlock_bh(&idev->lock);
2565 ipv6_create_tempaddr(ifp, NULL, false);
2566 } else {
2567 read_unlock_bh(&idev->lock);
2568 }
2569 }
2570
is_addr_mode_generate_stable(struct inet6_dev * idev)2571 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2572 {
2573 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2574 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2575 }
2576
addrconf_prefix_rcv_add_addr(struct net * net,struct net_device * dev,const struct prefix_info * pinfo,struct inet6_dev * in6_dev,const struct in6_addr * addr,int addr_type,u32 addr_flags,bool sllao,bool tokenized,__u32 valid_lft,u32 prefered_lft)2577 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2578 const struct prefix_info *pinfo,
2579 struct inet6_dev *in6_dev,
2580 const struct in6_addr *addr, int addr_type,
2581 u32 addr_flags, bool sllao, bool tokenized,
2582 __u32 valid_lft, u32 prefered_lft)
2583 {
2584 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2585 int create = 0, update_lft = 0;
2586
2587 if (!ifp && valid_lft) {
2588 int max_addresses = in6_dev->cnf.max_addresses;
2589 struct ifa6_config cfg = {
2590 .pfx = addr,
2591 .plen = pinfo->prefix_len,
2592 .ifa_flags = addr_flags,
2593 .valid_lft = valid_lft,
2594 .preferred_lft = prefered_lft,
2595 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2596 };
2597
2598 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2599 if ((net->ipv6.devconf_all->optimistic_dad ||
2600 in6_dev->cnf.optimistic_dad) &&
2601 !net->ipv6.devconf_all->forwarding && sllao)
2602 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2603 #endif
2604
2605 /* Do not allow to create too much of autoconfigured
2606 * addresses; this would be too easy way to crash kernel.
2607 */
2608 if (!max_addresses ||
2609 ipv6_count_addresses(in6_dev) < max_addresses)
2610 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2611
2612 if (IS_ERR_OR_NULL(ifp))
2613 return -1;
2614
2615 create = 1;
2616 spin_lock_bh(&ifp->lock);
2617 ifp->flags |= IFA_F_MANAGETEMPADDR;
2618 ifp->cstamp = jiffies;
2619 ifp->tokenized = tokenized;
2620 spin_unlock_bh(&ifp->lock);
2621 addrconf_dad_start(ifp);
2622 }
2623
2624 if (ifp) {
2625 u32 flags;
2626 unsigned long now;
2627 u32 stored_lft;
2628
2629 /* update lifetime (RFC2462 5.5.3 e) */
2630 spin_lock_bh(&ifp->lock);
2631 now = jiffies;
2632 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2633 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2634 else
2635 stored_lft = 0;
2636 if (!create && stored_lft) {
2637 const u32 minimum_lft = min_t(u32,
2638 stored_lft, MIN_VALID_LIFETIME);
2639 valid_lft = max(valid_lft, minimum_lft);
2640
2641 /* RFC4862 Section 5.5.3e:
2642 * "Note that the preferred lifetime of the
2643 * corresponding address is always reset to
2644 * the Preferred Lifetime in the received
2645 * Prefix Information option, regardless of
2646 * whether the valid lifetime is also reset or
2647 * ignored."
2648 *
2649 * So we should always update prefered_lft here.
2650 */
2651 update_lft = 1;
2652 }
2653
2654 if (update_lft) {
2655 ifp->valid_lft = valid_lft;
2656 ifp->prefered_lft = prefered_lft;
2657 ifp->tstamp = now;
2658 flags = ifp->flags;
2659 ifp->flags &= ~IFA_F_DEPRECATED;
2660 spin_unlock_bh(&ifp->lock);
2661
2662 if (!(flags&IFA_F_TENTATIVE))
2663 ipv6_ifa_notify(0, ifp);
2664 } else
2665 spin_unlock_bh(&ifp->lock);
2666
2667 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2668 create, now);
2669
2670 in6_ifa_put(ifp);
2671 addrconf_verify();
2672 }
2673
2674 return 0;
2675 }
2676 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2677
addrconf_prefix_rcv(struct net_device * dev,u8 * opt,int len,bool sllao)2678 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2679 {
2680 struct prefix_info *pinfo;
2681 __u32 valid_lft;
2682 __u32 prefered_lft;
2683 int addr_type, err;
2684 u32 addr_flags = 0;
2685 struct inet6_dev *in6_dev;
2686 struct net *net = dev_net(dev);
2687
2688 pinfo = (struct prefix_info *) opt;
2689
2690 if (len < sizeof(struct prefix_info)) {
2691 netdev_dbg(dev, "addrconf: prefix option too short\n");
2692 return;
2693 }
2694
2695 /*
2696 * Validation checks ([ADDRCONF], page 19)
2697 */
2698
2699 addr_type = ipv6_addr_type(&pinfo->prefix);
2700
2701 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2702 return;
2703
2704 valid_lft = ntohl(pinfo->valid);
2705 prefered_lft = ntohl(pinfo->prefered);
2706
2707 if (prefered_lft > valid_lft) {
2708 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2709 return;
2710 }
2711
2712 in6_dev = in6_dev_get(dev);
2713
2714 if (!in6_dev) {
2715 net_dbg_ratelimited("addrconf: device %s not configured\n",
2716 dev->name);
2717 return;
2718 }
2719
2720 /*
2721 * Two things going on here:
2722 * 1) Add routes for on-link prefixes
2723 * 2) Configure prefixes with the auto flag set
2724 */
2725
2726 if (pinfo->onlink) {
2727 struct fib6_info *rt;
2728 unsigned long rt_expires;
2729
2730 /* Avoid arithmetic overflow. Really, we could
2731 * save rt_expires in seconds, likely valid_lft,
2732 * but it would require division in fib gc, that it
2733 * not good.
2734 */
2735 if (HZ > USER_HZ)
2736 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2737 else
2738 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2739
2740 if (addrconf_finite_timeout(rt_expires))
2741 rt_expires *= HZ;
2742
2743 rt = addrconf_get_prefix_route(&pinfo->prefix,
2744 pinfo->prefix_len,
2745 dev,
2746 RTF_ADDRCONF | RTF_PREFIX_RT,
2747 RTF_DEFAULT, true);
2748
2749 if (rt) {
2750 /* Autoconf prefix route */
2751 if (valid_lft == 0) {
2752 ip6_del_rt(net, rt);
2753 rt = NULL;
2754 } else if (addrconf_finite_timeout(rt_expires)) {
2755 /* not infinity */
2756 fib6_set_expires(rt, jiffies + rt_expires);
2757 } else {
2758 fib6_clean_expires(rt);
2759 }
2760 } else if (valid_lft) {
2761 clock_t expires = 0;
2762 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2763 if (addrconf_finite_timeout(rt_expires)) {
2764 /* not infinity */
2765 flags |= RTF_EXPIRES;
2766 expires = jiffies_to_clock_t(rt_expires);
2767 }
2768 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2769 0, dev, expires, flags,
2770 GFP_ATOMIC);
2771 }
2772 fib6_info_release(rt);
2773 }
2774
2775 /* Try to figure out our local address for this prefix */
2776
2777 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2778 struct in6_addr addr;
2779 bool tokenized = false, dev_addr_generated = false;
2780
2781 if (pinfo->prefix_len == 64) {
2782 memcpy(&addr, &pinfo->prefix, 8);
2783
2784 if (!ipv6_addr_any(&in6_dev->token)) {
2785 read_lock_bh(&in6_dev->lock);
2786 memcpy(addr.s6_addr + 8,
2787 in6_dev->token.s6_addr + 8, 8);
2788 read_unlock_bh(&in6_dev->lock);
2789 tokenized = true;
2790 } else if (is_addr_mode_generate_stable(in6_dev) &&
2791 !ipv6_generate_stable_address(&addr, 0,
2792 in6_dev)) {
2793 addr_flags |= IFA_F_STABLE_PRIVACY;
2794 goto ok;
2795 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2796 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2797 goto put;
2798 } else {
2799 dev_addr_generated = true;
2800 }
2801 goto ok;
2802 }
2803 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2804 pinfo->prefix_len);
2805 goto put;
2806
2807 ok:
2808 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2809 &addr, addr_type,
2810 addr_flags, sllao,
2811 tokenized, valid_lft,
2812 prefered_lft);
2813 if (err)
2814 goto put;
2815
2816 /* Ignore error case here because previous prefix add addr was
2817 * successful which will be notified.
2818 */
2819 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2820 addr_type, addr_flags, sllao,
2821 tokenized, valid_lft,
2822 prefered_lft,
2823 dev_addr_generated);
2824 }
2825 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2826 put:
2827 in6_dev_put(in6_dev);
2828 }
2829
2830 /*
2831 * Set destination address.
2832 * Special case for SIT interfaces where we create a new "virtual"
2833 * device.
2834 */
addrconf_set_dstaddr(struct net * net,void __user * arg)2835 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2836 {
2837 struct in6_ifreq ireq;
2838 struct net_device *dev;
2839 int err = -EINVAL;
2840
2841 rtnl_lock();
2842
2843 err = -EFAULT;
2844 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2845 goto err_exit;
2846
2847 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2848
2849 err = -ENODEV;
2850 if (!dev)
2851 goto err_exit;
2852
2853 #if IS_ENABLED(CONFIG_IPV6_SIT)
2854 if (dev->type == ARPHRD_SIT) {
2855 const struct net_device_ops *ops = dev->netdev_ops;
2856 struct ifreq ifr;
2857 struct ip_tunnel_parm p;
2858
2859 err = -EADDRNOTAVAIL;
2860 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2861 goto err_exit;
2862
2863 memset(&p, 0, sizeof(p));
2864 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2865 p.iph.saddr = 0;
2866 p.iph.version = 4;
2867 p.iph.ihl = 5;
2868 p.iph.protocol = IPPROTO_IPV6;
2869 p.iph.ttl = 64;
2870 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2871
2872 if (ops->ndo_do_ioctl) {
2873 mm_segment_t oldfs = get_fs();
2874
2875 set_fs(KERNEL_DS);
2876 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2877 set_fs(oldfs);
2878 } else
2879 err = -EOPNOTSUPP;
2880
2881 if (err == 0) {
2882 err = -ENOBUFS;
2883 dev = __dev_get_by_name(net, p.name);
2884 if (!dev)
2885 goto err_exit;
2886 err = dev_open(dev, NULL);
2887 }
2888 }
2889 #endif
2890
2891 err_exit:
2892 rtnl_unlock();
2893 return err;
2894 }
2895
ipv6_mc_config(struct sock * sk,bool join,const struct in6_addr * addr,int ifindex)2896 static int ipv6_mc_config(struct sock *sk, bool join,
2897 const struct in6_addr *addr, int ifindex)
2898 {
2899 int ret;
2900
2901 ASSERT_RTNL();
2902
2903 lock_sock(sk);
2904 if (join)
2905 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2906 else
2907 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2908 release_sock(sk);
2909
2910 return ret;
2911 }
2912
2913 /*
2914 * Manual configuration of address on an interface
2915 */
inet6_addr_add(struct net * net,int ifindex,struct ifa6_config * cfg,struct netlink_ext_ack * extack)2916 static int inet6_addr_add(struct net *net, int ifindex,
2917 struct ifa6_config *cfg,
2918 struct netlink_ext_ack *extack)
2919 {
2920 struct inet6_ifaddr *ifp;
2921 struct inet6_dev *idev;
2922 struct net_device *dev;
2923 unsigned long timeout;
2924 clock_t expires;
2925 u32 flags;
2926
2927 ASSERT_RTNL();
2928
2929 if (cfg->plen > 128)
2930 return -EINVAL;
2931
2932 /* check the lifetime */
2933 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2934 return -EINVAL;
2935
2936 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2937 return -EINVAL;
2938
2939 dev = __dev_get_by_index(net, ifindex);
2940 if (!dev)
2941 return -ENODEV;
2942
2943 idev = addrconf_add_dev(dev);
2944 if (IS_ERR(idev))
2945 return PTR_ERR(idev);
2946
2947 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2948 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2949 true, cfg->pfx, ifindex);
2950
2951 if (ret < 0)
2952 return ret;
2953 }
2954
2955 cfg->scope = ipv6_addr_scope(cfg->pfx);
2956
2957 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2958 if (addrconf_finite_timeout(timeout)) {
2959 expires = jiffies_to_clock_t(timeout * HZ);
2960 cfg->valid_lft = timeout;
2961 flags = RTF_EXPIRES;
2962 } else {
2963 expires = 0;
2964 flags = 0;
2965 cfg->ifa_flags |= IFA_F_PERMANENT;
2966 }
2967
2968 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2969 if (addrconf_finite_timeout(timeout)) {
2970 if (timeout == 0)
2971 cfg->ifa_flags |= IFA_F_DEPRECATED;
2972 cfg->preferred_lft = timeout;
2973 }
2974
2975 ifp = ipv6_add_addr(idev, cfg, true, extack);
2976 if (!IS_ERR(ifp)) {
2977 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2978 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2979 ifp->rt_priority, dev, expires,
2980 flags, GFP_KERNEL);
2981 }
2982
2983 /* Send a netlink notification if DAD is enabled and
2984 * optimistic flag is not set
2985 */
2986 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2987 ipv6_ifa_notify(0, ifp);
2988 /*
2989 * Note that section 3.1 of RFC 4429 indicates
2990 * that the Optimistic flag should not be set for
2991 * manually configured addresses
2992 */
2993 addrconf_dad_start(ifp);
2994 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2995 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2996 cfg->preferred_lft, true, jiffies);
2997 in6_ifa_put(ifp);
2998 addrconf_verify_rtnl();
2999 return 0;
3000 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3001 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3002 cfg->pfx, ifindex);
3003 }
3004
3005 return PTR_ERR(ifp);
3006 }
3007
inet6_addr_del(struct net * net,int ifindex,u32 ifa_flags,const struct in6_addr * pfx,unsigned int plen)3008 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3009 const struct in6_addr *pfx, unsigned int plen)
3010 {
3011 struct inet6_ifaddr *ifp;
3012 struct inet6_dev *idev;
3013 struct net_device *dev;
3014
3015 if (plen > 128)
3016 return -EINVAL;
3017
3018 dev = __dev_get_by_index(net, ifindex);
3019 if (!dev)
3020 return -ENODEV;
3021
3022 idev = __in6_dev_get(dev);
3023 if (!idev)
3024 return -ENXIO;
3025
3026 read_lock_bh(&idev->lock);
3027 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3028 if (ifp->prefix_len == plen &&
3029 ipv6_addr_equal(pfx, &ifp->addr)) {
3030 in6_ifa_hold(ifp);
3031 read_unlock_bh(&idev->lock);
3032
3033 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3034 (ifa_flags & IFA_F_MANAGETEMPADDR))
3035 manage_tempaddrs(idev, ifp, 0, 0, false,
3036 jiffies);
3037 ipv6_del_addr(ifp);
3038 addrconf_verify_rtnl();
3039 if (ipv6_addr_is_multicast(pfx)) {
3040 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3041 false, pfx, dev->ifindex);
3042 }
3043 return 0;
3044 }
3045 }
3046 read_unlock_bh(&idev->lock);
3047 return -EADDRNOTAVAIL;
3048 }
3049
3050
addrconf_add_ifaddr(struct net * net,void __user * arg)3051 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3052 {
3053 struct ifa6_config cfg = {
3054 .ifa_flags = IFA_F_PERMANENT,
3055 .preferred_lft = INFINITY_LIFE_TIME,
3056 .valid_lft = INFINITY_LIFE_TIME,
3057 };
3058 struct in6_ifreq ireq;
3059 int err;
3060
3061 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3062 return -EPERM;
3063
3064 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3065 return -EFAULT;
3066
3067 cfg.pfx = &ireq.ifr6_addr;
3068 cfg.plen = ireq.ifr6_prefixlen;
3069
3070 rtnl_lock();
3071 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3072 rtnl_unlock();
3073 return err;
3074 }
3075
addrconf_del_ifaddr(struct net * net,void __user * arg)3076 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3077 {
3078 struct in6_ifreq ireq;
3079 int err;
3080
3081 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3082 return -EPERM;
3083
3084 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3085 return -EFAULT;
3086
3087 rtnl_lock();
3088 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3089 ireq.ifr6_prefixlen);
3090 rtnl_unlock();
3091 return err;
3092 }
3093
add_addr(struct inet6_dev * idev,const struct in6_addr * addr,int plen,int scope)3094 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3095 int plen, int scope)
3096 {
3097 struct inet6_ifaddr *ifp;
3098 struct ifa6_config cfg = {
3099 .pfx = addr,
3100 .plen = plen,
3101 .ifa_flags = IFA_F_PERMANENT,
3102 .valid_lft = INFINITY_LIFE_TIME,
3103 .preferred_lft = INFINITY_LIFE_TIME,
3104 .scope = scope
3105 };
3106
3107 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3108 if (!IS_ERR(ifp)) {
3109 spin_lock_bh(&ifp->lock);
3110 ifp->flags &= ~IFA_F_TENTATIVE;
3111 spin_unlock_bh(&ifp->lock);
3112 rt_genid_bump_ipv6(dev_net(idev->dev));
3113 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3114 in6_ifa_put(ifp);
3115 }
3116 }
3117
3118 #if IS_ENABLED(CONFIG_IPV6_SIT)
sit_add_v4_addrs(struct inet6_dev * idev)3119 static void sit_add_v4_addrs(struct inet6_dev *idev)
3120 {
3121 struct in6_addr addr;
3122 struct net_device *dev;
3123 struct net *net = dev_net(idev->dev);
3124 int scope, plen;
3125 u32 pflags = 0;
3126
3127 ASSERT_RTNL();
3128
3129 memset(&addr, 0, sizeof(struct in6_addr));
3130 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3131
3132 if (idev->dev->flags&IFF_POINTOPOINT) {
3133 addr.s6_addr32[0] = htonl(0xfe800000);
3134 scope = IFA_LINK;
3135 plen = 64;
3136 } else {
3137 scope = IPV6_ADDR_COMPATv4;
3138 plen = 96;
3139 pflags |= RTF_NONEXTHOP;
3140 }
3141
3142 if (addr.s6_addr32[3]) {
3143 add_addr(idev, &addr, plen, scope);
3144 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3145 GFP_KERNEL);
3146 return;
3147 }
3148
3149 for_each_netdev(net, dev) {
3150 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3151 if (in_dev && (dev->flags & IFF_UP)) {
3152 struct in_ifaddr *ifa;
3153 int flag = scope;
3154
3155 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3156 addr.s6_addr32[3] = ifa->ifa_local;
3157
3158 if (ifa->ifa_scope == RT_SCOPE_LINK)
3159 continue;
3160 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3161 if (idev->dev->flags&IFF_POINTOPOINT)
3162 continue;
3163 flag |= IFA_HOST;
3164 }
3165
3166 add_addr(idev, &addr, plen, flag);
3167 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3168 0, pflags, GFP_KERNEL);
3169 }
3170 }
3171 }
3172 }
3173 #endif
3174
init_loopback(struct net_device * dev)3175 static void init_loopback(struct net_device *dev)
3176 {
3177 struct inet6_dev *idev;
3178
3179 /* ::1 */
3180
3181 ASSERT_RTNL();
3182
3183 idev = ipv6_find_idev(dev);
3184 if (IS_ERR(idev)) {
3185 pr_debug("%s: add_dev failed\n", __func__);
3186 return;
3187 }
3188
3189 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3190 }
3191
addrconf_add_linklocal(struct inet6_dev * idev,const struct in6_addr * addr,u32 flags)3192 void addrconf_add_linklocal(struct inet6_dev *idev,
3193 const struct in6_addr *addr, u32 flags)
3194 {
3195 struct ifa6_config cfg = {
3196 .pfx = addr,
3197 .plen = 64,
3198 .ifa_flags = flags | IFA_F_PERMANENT,
3199 .valid_lft = INFINITY_LIFE_TIME,
3200 .preferred_lft = INFINITY_LIFE_TIME,
3201 .scope = IFA_LINK
3202 };
3203 struct inet6_ifaddr *ifp;
3204
3205 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3206 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3207 idev->cnf.optimistic_dad) &&
3208 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3209 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3210 #endif
3211
3212 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3213 if (!IS_ERR(ifp)) {
3214 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3215 0, 0, GFP_ATOMIC);
3216 addrconf_dad_start(ifp);
3217 in6_ifa_put(ifp);
3218 }
3219 }
3220 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3221
ipv6_reserved_interfaceid(struct in6_addr address)3222 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3223 {
3224 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3225 return true;
3226
3227 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3228 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3229 return true;
3230
3231 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3232 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3233 return true;
3234
3235 return false;
3236 }
3237
ipv6_generate_stable_address(struct in6_addr * address,u8 dad_count,const struct inet6_dev * idev)3238 static int ipv6_generate_stable_address(struct in6_addr *address,
3239 u8 dad_count,
3240 const struct inet6_dev *idev)
3241 {
3242 static DEFINE_SPINLOCK(lock);
3243 static __u32 digest[SHA_DIGEST_WORDS];
3244 static __u32 workspace[SHA_WORKSPACE_WORDS];
3245
3246 static union {
3247 char __data[SHA_MESSAGE_BYTES];
3248 struct {
3249 struct in6_addr secret;
3250 __be32 prefix[2];
3251 unsigned char hwaddr[MAX_ADDR_LEN];
3252 u8 dad_count;
3253 } __packed;
3254 } data;
3255
3256 struct in6_addr secret;
3257 struct in6_addr temp;
3258 struct net *net = dev_net(idev->dev);
3259
3260 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3261
3262 if (idev->cnf.stable_secret.initialized)
3263 secret = idev->cnf.stable_secret.secret;
3264 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3265 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3266 else
3267 return -1;
3268
3269 retry:
3270 spin_lock_bh(&lock);
3271
3272 sha_init(digest);
3273 memset(&data, 0, sizeof(data));
3274 memset(workspace, 0, sizeof(workspace));
3275 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3276 data.prefix[0] = address->s6_addr32[0];
3277 data.prefix[1] = address->s6_addr32[1];
3278 data.secret = secret;
3279 data.dad_count = dad_count;
3280
3281 sha_transform(digest, data.__data, workspace);
3282
3283 temp = *address;
3284 temp.s6_addr32[2] = (__force __be32)digest[0];
3285 temp.s6_addr32[3] = (__force __be32)digest[1];
3286
3287 spin_unlock_bh(&lock);
3288
3289 if (ipv6_reserved_interfaceid(temp)) {
3290 dad_count++;
3291 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3292 return -1;
3293 goto retry;
3294 }
3295
3296 *address = temp;
3297 return 0;
3298 }
3299
ipv6_gen_mode_random_init(struct inet6_dev * idev)3300 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3301 {
3302 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3303
3304 if (s->initialized)
3305 return;
3306 s = &idev->cnf.stable_secret;
3307 get_random_bytes(&s->secret, sizeof(s->secret));
3308 s->initialized = true;
3309 }
3310
addrconf_addr_gen(struct inet6_dev * idev,bool prefix_route)3311 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3312 {
3313 struct in6_addr addr;
3314
3315 /* no link local addresses on L3 master devices */
3316 if (netif_is_l3_master(idev->dev))
3317 return;
3318
3319 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3320
3321 switch (idev->cnf.addr_gen_mode) {
3322 case IN6_ADDR_GEN_MODE_RANDOM:
3323 ipv6_gen_mode_random_init(idev);
3324 /* fallthrough */
3325 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3326 if (!ipv6_generate_stable_address(&addr, 0, idev))
3327 addrconf_add_linklocal(idev, &addr,
3328 IFA_F_STABLE_PRIVACY);
3329 else if (prefix_route)
3330 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3331 0, 0, GFP_KERNEL);
3332 break;
3333 case IN6_ADDR_GEN_MODE_EUI64:
3334 /* addrconf_add_linklocal also adds a prefix_route and we
3335 * only need to care about prefix routes if ipv6_generate_eui64
3336 * couldn't generate one.
3337 */
3338 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3339 addrconf_add_linklocal(idev, &addr, 0);
3340 else if (prefix_route)
3341 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3342 0, 0, GFP_KERNEL);
3343 break;
3344 case IN6_ADDR_GEN_MODE_NONE:
3345 default:
3346 /* will not add any link local address */
3347 break;
3348 }
3349 }
3350
addrconf_dev_config(struct net_device * dev)3351 static void addrconf_dev_config(struct net_device *dev)
3352 {
3353 struct inet6_dev *idev;
3354
3355 ASSERT_RTNL();
3356
3357 if ((dev->type != ARPHRD_ETHER) &&
3358 (dev->type != ARPHRD_FDDI) &&
3359 (dev->type != ARPHRD_ARCNET) &&
3360 (dev->type != ARPHRD_INFINIBAND) &&
3361 (dev->type != ARPHRD_IEEE1394) &&
3362 (dev->type != ARPHRD_TUNNEL6) &&
3363 (dev->type != ARPHRD_6LOWPAN) &&
3364 (dev->type != ARPHRD_IP6GRE) &&
3365 (dev->type != ARPHRD_IPGRE) &&
3366 (dev->type != ARPHRD_TUNNEL) &&
3367 (dev->type != ARPHRD_NONE) &&
3368 (dev->type != ARPHRD_RAWIP)) {
3369 /* Alas, we support only Ethernet autoconfiguration. */
3370 return;
3371 }
3372
3373 idev = addrconf_add_dev(dev);
3374 if (IS_ERR(idev))
3375 return;
3376
3377 /* this device type has no EUI support */
3378 if (dev->type == ARPHRD_NONE &&
3379 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3380 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3381
3382 addrconf_addr_gen(idev, false);
3383 }
3384
3385 #if IS_ENABLED(CONFIG_IPV6_SIT)
addrconf_sit_config(struct net_device * dev)3386 static void addrconf_sit_config(struct net_device *dev)
3387 {
3388 struct inet6_dev *idev;
3389
3390 ASSERT_RTNL();
3391
3392 /*
3393 * Configure the tunnel with one of our IPv4
3394 * addresses... we should configure all of
3395 * our v4 addrs in the tunnel
3396 */
3397
3398 idev = ipv6_find_idev(dev);
3399 if (IS_ERR(idev)) {
3400 pr_debug("%s: add_dev failed\n", __func__);
3401 return;
3402 }
3403
3404 if (dev->priv_flags & IFF_ISATAP) {
3405 addrconf_addr_gen(idev, false);
3406 return;
3407 }
3408
3409 sit_add_v4_addrs(idev);
3410
3411 if (dev->flags&IFF_POINTOPOINT)
3412 addrconf_add_mroute(dev);
3413 }
3414 #endif
3415
3416 #if IS_ENABLED(CONFIG_NET_IPGRE)
addrconf_gre_config(struct net_device * dev)3417 static void addrconf_gre_config(struct net_device *dev)
3418 {
3419 struct inet6_dev *idev;
3420
3421 ASSERT_RTNL();
3422
3423 idev = ipv6_find_idev(dev);
3424 if (IS_ERR(idev)) {
3425 pr_debug("%s: add_dev failed\n", __func__);
3426 return;
3427 }
3428
3429 addrconf_addr_gen(idev, true);
3430 if (dev->flags & IFF_POINTOPOINT)
3431 addrconf_add_mroute(dev);
3432 }
3433 #endif
3434
fixup_permanent_addr(struct net * net,struct inet6_dev * idev,struct inet6_ifaddr * ifp)3435 static int fixup_permanent_addr(struct net *net,
3436 struct inet6_dev *idev,
3437 struct inet6_ifaddr *ifp)
3438 {
3439 /* !fib6_node means the host route was removed from the
3440 * FIB, for example, if 'lo' device is taken down. In that
3441 * case regenerate the host route.
3442 */
3443 if (!ifp->rt || !ifp->rt->fib6_node) {
3444 struct fib6_info *f6i, *prev;
3445
3446 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3447 GFP_ATOMIC);
3448 if (IS_ERR(f6i))
3449 return PTR_ERR(f6i);
3450
3451 /* ifp->rt can be accessed outside of rtnl */
3452 spin_lock(&ifp->lock);
3453 prev = ifp->rt;
3454 ifp->rt = f6i;
3455 spin_unlock(&ifp->lock);
3456
3457 fib6_info_release(prev);
3458 }
3459
3460 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3461 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3462 ifp->rt_priority, idev->dev, 0, 0,
3463 GFP_ATOMIC);
3464 }
3465
3466 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3467 addrconf_dad_start(ifp);
3468
3469 return 0;
3470 }
3471
addrconf_permanent_addr(struct net * net,struct net_device * dev)3472 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3473 {
3474 struct inet6_ifaddr *ifp, *tmp;
3475 struct inet6_dev *idev;
3476
3477 idev = __in6_dev_get(dev);
3478 if (!idev)
3479 return;
3480
3481 write_lock_bh(&idev->lock);
3482
3483 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3484 if ((ifp->flags & IFA_F_PERMANENT) &&
3485 fixup_permanent_addr(net, idev, ifp) < 0) {
3486 write_unlock_bh(&idev->lock);
3487 in6_ifa_hold(ifp);
3488 ipv6_del_addr(ifp);
3489 write_lock_bh(&idev->lock);
3490
3491 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3492 idev->dev->name, &ifp->addr);
3493 }
3494 }
3495
3496 write_unlock_bh(&idev->lock);
3497 }
3498
addrconf_notify(struct notifier_block * this,unsigned long event,void * ptr)3499 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3500 void *ptr)
3501 {
3502 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3503 struct netdev_notifier_change_info *change_info;
3504 struct netdev_notifier_changeupper_info *info;
3505 struct inet6_dev *idev = __in6_dev_get(dev);
3506 struct net *net = dev_net(dev);
3507 int run_pending = 0;
3508 int err;
3509
3510 switch (event) {
3511 case NETDEV_REGISTER:
3512 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3513 idev = ipv6_add_dev(dev);
3514 if (IS_ERR(idev))
3515 return notifier_from_errno(PTR_ERR(idev));
3516 }
3517 break;
3518
3519 case NETDEV_CHANGEMTU:
3520 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3521 if (dev->mtu < IPV6_MIN_MTU) {
3522 addrconf_ifdown(dev, dev != net->loopback_dev);
3523 break;
3524 }
3525
3526 if (idev) {
3527 rt6_mtu_change(dev, dev->mtu);
3528 idev->cnf.mtu6 = dev->mtu;
3529 break;
3530 }
3531
3532 /* allocate new idev */
3533 idev = ipv6_add_dev(dev);
3534 if (IS_ERR(idev))
3535 break;
3536
3537 /* device is still not ready */
3538 if (!(idev->if_flags & IF_READY))
3539 break;
3540
3541 run_pending = 1;
3542
3543 /* fall through */
3544
3545 case NETDEV_UP:
3546 case NETDEV_CHANGE:
3547 if (dev->flags & IFF_SLAVE)
3548 break;
3549
3550 if (idev && idev->cnf.disable_ipv6)
3551 break;
3552
3553 if (event == NETDEV_UP) {
3554 /* restore routes for permanent addresses */
3555 addrconf_permanent_addr(net, dev);
3556
3557 if (!addrconf_link_ready(dev)) {
3558 /* device is not ready yet. */
3559 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3560 dev->name);
3561 break;
3562 }
3563
3564 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3565 idev = ipv6_add_dev(dev);
3566
3567 if (!IS_ERR_OR_NULL(idev)) {
3568 idev->if_flags |= IF_READY;
3569 run_pending = 1;
3570 }
3571 } else if (event == NETDEV_CHANGE) {
3572 if (!addrconf_link_ready(dev)) {
3573 /* device is still not ready. */
3574 rt6_sync_down_dev(dev, event);
3575 break;
3576 }
3577
3578 if (!IS_ERR_OR_NULL(idev)) {
3579 if (idev->if_flags & IF_READY) {
3580 /* device is already configured -
3581 * but resend MLD reports, we might
3582 * have roamed and need to update
3583 * multicast snooping switches
3584 */
3585 ipv6_mc_up(idev);
3586 change_info = ptr;
3587 if (change_info->flags_changed & IFF_NOARP)
3588 addrconf_dad_run(idev, true);
3589 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3590 break;
3591 }
3592 idev->if_flags |= IF_READY;
3593 }
3594
3595 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3596 dev->name);
3597
3598 run_pending = 1;
3599 }
3600
3601 switch (dev->type) {
3602 #if IS_ENABLED(CONFIG_IPV6_SIT)
3603 case ARPHRD_SIT:
3604 addrconf_sit_config(dev);
3605 break;
3606 #endif
3607 #if IS_ENABLED(CONFIG_NET_IPGRE)
3608 case ARPHRD_IPGRE:
3609 addrconf_gre_config(dev);
3610 break;
3611 #endif
3612 case ARPHRD_LOOPBACK:
3613 init_loopback(dev);
3614 break;
3615
3616 default:
3617 addrconf_dev_config(dev);
3618 break;
3619 }
3620
3621 if (!IS_ERR_OR_NULL(idev)) {
3622 if (run_pending)
3623 addrconf_dad_run(idev, false);
3624
3625 /* Device has an address by now */
3626 rt6_sync_up(dev, RTNH_F_DEAD);
3627
3628 /*
3629 * If the MTU changed during the interface down,
3630 * when the interface up, the changed MTU must be
3631 * reflected in the idev as well as routers.
3632 */
3633 if (idev->cnf.mtu6 != dev->mtu &&
3634 dev->mtu >= IPV6_MIN_MTU) {
3635 rt6_mtu_change(dev, dev->mtu);
3636 idev->cnf.mtu6 = dev->mtu;
3637 }
3638 idev->tstamp = jiffies;
3639 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3640
3641 /*
3642 * If the changed mtu during down is lower than
3643 * IPV6_MIN_MTU stop IPv6 on this interface.
3644 */
3645 if (dev->mtu < IPV6_MIN_MTU)
3646 addrconf_ifdown(dev, dev != net->loopback_dev);
3647 }
3648 break;
3649
3650 case NETDEV_DOWN:
3651 case NETDEV_UNREGISTER:
3652 /*
3653 * Remove all addresses from this interface.
3654 */
3655 addrconf_ifdown(dev, event != NETDEV_DOWN);
3656 break;
3657
3658 case NETDEV_CHANGENAME:
3659 if (idev) {
3660 snmp6_unregister_dev(idev);
3661 addrconf_sysctl_unregister(idev);
3662 err = addrconf_sysctl_register(idev);
3663 if (err)
3664 return notifier_from_errno(err);
3665 err = snmp6_register_dev(idev);
3666 if (err) {
3667 addrconf_sysctl_unregister(idev);
3668 return notifier_from_errno(err);
3669 }
3670 }
3671 break;
3672
3673 case NETDEV_PRE_TYPE_CHANGE:
3674 case NETDEV_POST_TYPE_CHANGE:
3675 if (idev)
3676 addrconf_type_change(dev, event);
3677 break;
3678
3679 case NETDEV_CHANGEUPPER:
3680 info = ptr;
3681
3682 /* flush all routes if dev is linked to or unlinked from
3683 * an L3 master device (e.g., VRF)
3684 */
3685 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3686 addrconf_ifdown(dev, 0);
3687 }
3688
3689 return NOTIFY_OK;
3690 }
3691
3692 /*
3693 * addrconf module should be notified of a device going up
3694 */
3695 static struct notifier_block ipv6_dev_notf = {
3696 .notifier_call = addrconf_notify,
3697 .priority = ADDRCONF_NOTIFY_PRIORITY,
3698 };
3699
addrconf_type_change(struct net_device * dev,unsigned long event)3700 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3701 {
3702 struct inet6_dev *idev;
3703 ASSERT_RTNL();
3704
3705 idev = __in6_dev_get(dev);
3706
3707 if (event == NETDEV_POST_TYPE_CHANGE)
3708 ipv6_mc_remap(idev);
3709 else if (event == NETDEV_PRE_TYPE_CHANGE)
3710 ipv6_mc_unmap(idev);
3711 }
3712
addr_is_local(const struct in6_addr * addr)3713 static bool addr_is_local(const struct in6_addr *addr)
3714 {
3715 return ipv6_addr_type(addr) &
3716 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3717 }
3718
addrconf_ifdown(struct net_device * dev,int how)3719 static int addrconf_ifdown(struct net_device *dev, int how)
3720 {
3721 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3722 struct net *net = dev_net(dev);
3723 struct inet6_dev *idev;
3724 struct inet6_ifaddr *ifa, *tmp;
3725 bool keep_addr = false;
3726 int state, i;
3727
3728 ASSERT_RTNL();
3729
3730 rt6_disable_ip(dev, event);
3731
3732 idev = __in6_dev_get(dev);
3733 if (!idev)
3734 return -ENODEV;
3735
3736 /*
3737 * Step 1: remove reference to ipv6 device from parent device.
3738 * Do not dev_put!
3739 */
3740 if (how) {
3741 idev->dead = 1;
3742
3743 /* protected by rtnl_lock */
3744 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3745
3746 /* Step 1.5: remove snmp6 entry */
3747 snmp6_unregister_dev(idev);
3748
3749 }
3750
3751 /* combine the user config with event to determine if permanent
3752 * addresses are to be removed from address hash table
3753 */
3754 if (!how && !idev->cnf.disable_ipv6) {
3755 /* aggregate the system setting and interface setting */
3756 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3757
3758 if (!_keep_addr)
3759 _keep_addr = idev->cnf.keep_addr_on_down;
3760
3761 keep_addr = (_keep_addr > 0);
3762 }
3763
3764 /* Step 2: clear hash table */
3765 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3766 struct hlist_head *h = &inet6_addr_lst[i];
3767
3768 spin_lock_bh(&addrconf_hash_lock);
3769 restart:
3770 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3771 if (ifa->idev == idev) {
3772 addrconf_del_dad_work(ifa);
3773 /* combined flag + permanent flag decide if
3774 * address is retained on a down event
3775 */
3776 if (!keep_addr ||
3777 !(ifa->flags & IFA_F_PERMANENT) ||
3778 addr_is_local(&ifa->addr)) {
3779 hlist_del_init_rcu(&ifa->addr_lst);
3780 goto restart;
3781 }
3782 }
3783 }
3784 spin_unlock_bh(&addrconf_hash_lock);
3785 }
3786
3787 write_lock_bh(&idev->lock);
3788
3789 addrconf_del_rs_timer(idev);
3790
3791 /* Step 2: clear flags for stateless addrconf */
3792 if (!how)
3793 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3794
3795 /* Step 3: clear tempaddr list */
3796 while (!list_empty(&idev->tempaddr_list)) {
3797 ifa = list_first_entry(&idev->tempaddr_list,
3798 struct inet6_ifaddr, tmp_list);
3799 list_del(&ifa->tmp_list);
3800 write_unlock_bh(&idev->lock);
3801 spin_lock_bh(&ifa->lock);
3802
3803 if (ifa->ifpub) {
3804 in6_ifa_put(ifa->ifpub);
3805 ifa->ifpub = NULL;
3806 }
3807 spin_unlock_bh(&ifa->lock);
3808 in6_ifa_put(ifa);
3809 write_lock_bh(&idev->lock);
3810 }
3811
3812 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3813 struct fib6_info *rt = NULL;
3814 bool keep;
3815
3816 addrconf_del_dad_work(ifa);
3817
3818 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3819 !addr_is_local(&ifa->addr);
3820
3821 write_unlock_bh(&idev->lock);
3822 spin_lock_bh(&ifa->lock);
3823
3824 if (keep) {
3825 /* set state to skip the notifier below */
3826 state = INET6_IFADDR_STATE_DEAD;
3827 ifa->state = INET6_IFADDR_STATE_PREDAD;
3828 if (!(ifa->flags & IFA_F_NODAD))
3829 ifa->flags |= IFA_F_TENTATIVE;
3830
3831 rt = ifa->rt;
3832 ifa->rt = NULL;
3833 } else {
3834 state = ifa->state;
3835 ifa->state = INET6_IFADDR_STATE_DEAD;
3836 }
3837
3838 spin_unlock_bh(&ifa->lock);
3839
3840 if (rt)
3841 ip6_del_rt(net, rt);
3842
3843 if (state != INET6_IFADDR_STATE_DEAD) {
3844 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3845 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3846 } else {
3847 if (idev->cnf.forwarding)
3848 addrconf_leave_anycast(ifa);
3849 addrconf_leave_solict(ifa->idev, &ifa->addr);
3850 }
3851
3852 write_lock_bh(&idev->lock);
3853 if (!keep) {
3854 list_del_rcu(&ifa->if_list);
3855 in6_ifa_put(ifa);
3856 }
3857 }
3858
3859 write_unlock_bh(&idev->lock);
3860
3861 /* Step 5: Discard anycast and multicast list */
3862 if (how) {
3863 ipv6_ac_destroy_dev(idev);
3864 ipv6_mc_destroy_dev(idev);
3865 } else {
3866 ipv6_mc_down(idev);
3867 }
3868
3869 idev->tstamp = jiffies;
3870
3871 /* Last: Shot the device (if unregistered) */
3872 if (how) {
3873 addrconf_sysctl_unregister(idev);
3874 neigh_parms_release(&nd_tbl, idev->nd_parms);
3875 neigh_ifdown(&nd_tbl, dev);
3876 in6_dev_put(idev);
3877 }
3878 return 0;
3879 }
3880
addrconf_rs_timer(struct timer_list * t)3881 static void addrconf_rs_timer(struct timer_list *t)
3882 {
3883 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3884 struct net_device *dev = idev->dev;
3885 struct in6_addr lladdr;
3886
3887 write_lock(&idev->lock);
3888 if (idev->dead || !(idev->if_flags & IF_READY))
3889 goto out;
3890
3891 if (!ipv6_accept_ra(idev))
3892 goto out;
3893
3894 /* Announcement received after solicitation was sent */
3895 if (idev->if_flags & IF_RA_RCVD)
3896 goto out;
3897
3898 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3899 write_unlock(&idev->lock);
3900 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3901 ndisc_send_rs(dev, &lladdr,
3902 &in6addr_linklocal_allrouters);
3903 else
3904 goto put;
3905
3906 write_lock(&idev->lock);
3907 idev->rs_interval = rfc3315_s14_backoff_update(
3908 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3909 /* The wait after the last probe can be shorter */
3910 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3911 idev->cnf.rtr_solicits) ?
3912 idev->cnf.rtr_solicit_delay :
3913 idev->rs_interval);
3914 } else {
3915 /*
3916 * Note: we do not support deprecated "all on-link"
3917 * assumption any longer.
3918 */
3919 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3920 }
3921
3922 out:
3923 write_unlock(&idev->lock);
3924 put:
3925 in6_dev_put(idev);
3926 }
3927
3928 /*
3929 * Duplicate Address Detection
3930 */
addrconf_dad_kick(struct inet6_ifaddr * ifp)3931 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3932 {
3933 unsigned long rand_num;
3934 struct inet6_dev *idev = ifp->idev;
3935 u64 nonce;
3936
3937 if (ifp->flags & IFA_F_OPTIMISTIC)
3938 rand_num = 0;
3939 else
3940 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3941
3942 nonce = 0;
3943 if (idev->cnf.enhanced_dad ||
3944 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3945 do
3946 get_random_bytes(&nonce, 6);
3947 while (nonce == 0);
3948 }
3949 ifp->dad_nonce = nonce;
3950 ifp->dad_probes = idev->cnf.dad_transmits;
3951 addrconf_mod_dad_work(ifp, rand_num);
3952 }
3953
addrconf_dad_begin(struct inet6_ifaddr * ifp)3954 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3955 {
3956 struct inet6_dev *idev = ifp->idev;
3957 struct net_device *dev = idev->dev;
3958 bool bump_id, notify = false;
3959 struct net *net;
3960
3961 addrconf_join_solict(dev, &ifp->addr);
3962
3963 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3964
3965 read_lock_bh(&idev->lock);
3966 spin_lock(&ifp->lock);
3967 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3968 goto out;
3969
3970 net = dev_net(dev);
3971 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3972 (net->ipv6.devconf_all->accept_dad < 1 &&
3973 idev->cnf.accept_dad < 1) ||
3974 !(ifp->flags&IFA_F_TENTATIVE) ||
3975 ifp->flags & IFA_F_NODAD) {
3976 bool send_na = false;
3977
3978 if (ifp->flags & IFA_F_TENTATIVE &&
3979 !(ifp->flags & IFA_F_OPTIMISTIC))
3980 send_na = true;
3981 bump_id = ifp->flags & IFA_F_TENTATIVE;
3982 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3983 spin_unlock(&ifp->lock);
3984 read_unlock_bh(&idev->lock);
3985
3986 addrconf_dad_completed(ifp, bump_id, send_na);
3987 return;
3988 }
3989
3990 if (!(idev->if_flags & IF_READY)) {
3991 spin_unlock(&ifp->lock);
3992 read_unlock_bh(&idev->lock);
3993 /*
3994 * If the device is not ready:
3995 * - keep it tentative if it is a permanent address.
3996 * - otherwise, kill it.
3997 */
3998 in6_ifa_hold(ifp);
3999 addrconf_dad_stop(ifp, 0);
4000 return;
4001 }
4002
4003 /*
4004 * Optimistic nodes can start receiving
4005 * Frames right away
4006 */
4007 if (ifp->flags & IFA_F_OPTIMISTIC) {
4008 ip6_ins_rt(net, ifp->rt);
4009 if (ipv6_use_optimistic_addr(net, idev)) {
4010 /* Because optimistic nodes can use this address,
4011 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4012 */
4013 notify = true;
4014 }
4015 }
4016
4017 addrconf_dad_kick(ifp);
4018 out:
4019 spin_unlock(&ifp->lock);
4020 read_unlock_bh(&idev->lock);
4021 if (notify)
4022 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4023 }
4024
addrconf_dad_start(struct inet6_ifaddr * ifp)4025 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4026 {
4027 bool begin_dad = false;
4028
4029 spin_lock_bh(&ifp->lock);
4030 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4031 ifp->state = INET6_IFADDR_STATE_PREDAD;
4032 begin_dad = true;
4033 }
4034 spin_unlock_bh(&ifp->lock);
4035
4036 if (begin_dad)
4037 addrconf_mod_dad_work(ifp, 0);
4038 }
4039
addrconf_dad_work(struct work_struct * w)4040 static void addrconf_dad_work(struct work_struct *w)
4041 {
4042 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4043 struct inet6_ifaddr,
4044 dad_work);
4045 struct inet6_dev *idev = ifp->idev;
4046 bool bump_id, disable_ipv6 = false;
4047 struct in6_addr mcaddr;
4048
4049 enum {
4050 DAD_PROCESS,
4051 DAD_BEGIN,
4052 DAD_ABORT,
4053 } action = DAD_PROCESS;
4054
4055 rtnl_lock();
4056
4057 spin_lock_bh(&ifp->lock);
4058 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4059 action = DAD_BEGIN;
4060 ifp->state = INET6_IFADDR_STATE_DAD;
4061 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4062 action = DAD_ABORT;
4063 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4064
4065 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4066 idev->cnf.accept_dad > 1) &&
4067 !idev->cnf.disable_ipv6 &&
4068 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4069 struct in6_addr addr;
4070
4071 addr.s6_addr32[0] = htonl(0xfe800000);
4072 addr.s6_addr32[1] = 0;
4073
4074 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4075 ipv6_addr_equal(&ifp->addr, &addr)) {
4076 /* DAD failed for link-local based on MAC */
4077 idev->cnf.disable_ipv6 = 1;
4078
4079 pr_info("%s: IPv6 being disabled!\n",
4080 ifp->idev->dev->name);
4081 disable_ipv6 = true;
4082 }
4083 }
4084 }
4085 spin_unlock_bh(&ifp->lock);
4086
4087 if (action == DAD_BEGIN) {
4088 addrconf_dad_begin(ifp);
4089 goto out;
4090 } else if (action == DAD_ABORT) {
4091 in6_ifa_hold(ifp);
4092 addrconf_dad_stop(ifp, 1);
4093 if (disable_ipv6)
4094 addrconf_ifdown(idev->dev, 0);
4095 goto out;
4096 }
4097
4098 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4099 goto out;
4100
4101 write_lock_bh(&idev->lock);
4102 if (idev->dead || !(idev->if_flags & IF_READY)) {
4103 write_unlock_bh(&idev->lock);
4104 goto out;
4105 }
4106
4107 spin_lock(&ifp->lock);
4108 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4109 spin_unlock(&ifp->lock);
4110 write_unlock_bh(&idev->lock);
4111 goto out;
4112 }
4113
4114 if (ifp->dad_probes == 0) {
4115 bool send_na = false;
4116
4117 /*
4118 * DAD was successful
4119 */
4120
4121 if (ifp->flags & IFA_F_TENTATIVE &&
4122 !(ifp->flags & IFA_F_OPTIMISTIC))
4123 send_na = true;
4124 bump_id = ifp->flags & IFA_F_TENTATIVE;
4125 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4126 spin_unlock(&ifp->lock);
4127 write_unlock_bh(&idev->lock);
4128
4129 addrconf_dad_completed(ifp, bump_id, send_na);
4130
4131 goto out;
4132 }
4133
4134 ifp->dad_probes--;
4135 addrconf_mod_dad_work(ifp,
4136 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4137 spin_unlock(&ifp->lock);
4138 write_unlock_bh(&idev->lock);
4139
4140 /* send a neighbour solicitation for our addr */
4141 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4142 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4143 ifp->dad_nonce);
4144 out:
4145 in6_ifa_put(ifp);
4146 rtnl_unlock();
4147 }
4148
4149 /* ifp->idev must be at least read locked */
ipv6_lonely_lladdr(struct inet6_ifaddr * ifp)4150 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4151 {
4152 struct inet6_ifaddr *ifpiter;
4153 struct inet6_dev *idev = ifp->idev;
4154
4155 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4156 if (ifpiter->scope > IFA_LINK)
4157 break;
4158 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4159 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4160 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4161 IFA_F_PERMANENT)
4162 return false;
4163 }
4164 return true;
4165 }
4166
addrconf_dad_completed(struct inet6_ifaddr * ifp,bool bump_id,bool send_na)4167 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4168 bool send_na)
4169 {
4170 struct net_device *dev = ifp->idev->dev;
4171 struct in6_addr lladdr;
4172 bool send_rs, send_mld;
4173
4174 addrconf_del_dad_work(ifp);
4175
4176 /*
4177 * Configure the address for reception. Now it is valid.
4178 */
4179
4180 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4181
4182 /* If added prefix is link local and we are prepared to process
4183 router advertisements, start sending router solicitations.
4184 */
4185
4186 read_lock_bh(&ifp->idev->lock);
4187 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4188 send_rs = send_mld &&
4189 ipv6_accept_ra(ifp->idev) &&
4190 ifp->idev->cnf.rtr_solicits != 0 &&
4191 (dev->flags&IFF_LOOPBACK) == 0;
4192 read_unlock_bh(&ifp->idev->lock);
4193
4194 /* While dad is in progress mld report's source address is in6_addrany.
4195 * Resend with proper ll now.
4196 */
4197 if (send_mld)
4198 ipv6_mc_dad_complete(ifp->idev);
4199
4200 /* send unsolicited NA if enabled */
4201 if (send_na &&
4202 (ifp->idev->cnf.ndisc_notify ||
4203 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4204 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4205 /*router=*/ !!ifp->idev->cnf.forwarding,
4206 /*solicited=*/ false, /*override=*/ true,
4207 /*inc_opt=*/ true);
4208 }
4209
4210 if (send_rs) {
4211 /*
4212 * If a host as already performed a random delay
4213 * [...] as part of DAD [...] there is no need
4214 * to delay again before sending the first RS
4215 */
4216 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4217 return;
4218 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4219
4220 write_lock_bh(&ifp->idev->lock);
4221 spin_lock(&ifp->lock);
4222 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4223 ifp->idev->cnf.rtr_solicit_interval);
4224 ifp->idev->rs_probes = 1;
4225 ifp->idev->if_flags |= IF_RS_SENT;
4226 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4227 spin_unlock(&ifp->lock);
4228 write_unlock_bh(&ifp->idev->lock);
4229 }
4230
4231 if (bump_id)
4232 rt_genid_bump_ipv6(dev_net(dev));
4233
4234 /* Make sure that a new temporary address will be created
4235 * before this temporary address becomes deprecated.
4236 */
4237 if (ifp->flags & IFA_F_TEMPORARY)
4238 addrconf_verify_rtnl();
4239 }
4240
addrconf_dad_run(struct inet6_dev * idev,bool restart)4241 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4242 {
4243 struct inet6_ifaddr *ifp;
4244
4245 read_lock_bh(&idev->lock);
4246 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4247 spin_lock(&ifp->lock);
4248 if ((ifp->flags & IFA_F_TENTATIVE &&
4249 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4250 if (restart)
4251 ifp->state = INET6_IFADDR_STATE_PREDAD;
4252 addrconf_dad_kick(ifp);
4253 }
4254 spin_unlock(&ifp->lock);
4255 }
4256 read_unlock_bh(&idev->lock);
4257 }
4258
4259 #ifdef CONFIG_PROC_FS
4260 struct if6_iter_state {
4261 struct seq_net_private p;
4262 int bucket;
4263 int offset;
4264 };
4265
if6_get_first(struct seq_file * seq,loff_t pos)4266 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4267 {
4268 struct if6_iter_state *state = seq->private;
4269 struct net *net = seq_file_net(seq);
4270 struct inet6_ifaddr *ifa = NULL;
4271 int p = 0;
4272
4273 /* initial bucket if pos is 0 */
4274 if (pos == 0) {
4275 state->bucket = 0;
4276 state->offset = 0;
4277 }
4278
4279 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4280 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4281 addr_lst) {
4282 if (!net_eq(dev_net(ifa->idev->dev), net))
4283 continue;
4284 /* sync with offset */
4285 if (p < state->offset) {
4286 p++;
4287 continue;
4288 }
4289 return ifa;
4290 }
4291
4292 /* prepare for next bucket */
4293 state->offset = 0;
4294 p = 0;
4295 }
4296 return NULL;
4297 }
4298
if6_get_next(struct seq_file * seq,struct inet6_ifaddr * ifa)4299 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4300 struct inet6_ifaddr *ifa)
4301 {
4302 struct if6_iter_state *state = seq->private;
4303 struct net *net = seq_file_net(seq);
4304
4305 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4306 if (!net_eq(dev_net(ifa->idev->dev), net))
4307 continue;
4308 state->offset++;
4309 return ifa;
4310 }
4311
4312 state->offset = 0;
4313 while (++state->bucket < IN6_ADDR_HSIZE) {
4314 hlist_for_each_entry_rcu(ifa,
4315 &inet6_addr_lst[state->bucket], addr_lst) {
4316 if (!net_eq(dev_net(ifa->idev->dev), net))
4317 continue;
4318 return ifa;
4319 }
4320 }
4321
4322 return NULL;
4323 }
4324
if6_seq_start(struct seq_file * seq,loff_t * pos)4325 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4326 __acquires(rcu)
4327 {
4328 rcu_read_lock();
4329 return if6_get_first(seq, *pos);
4330 }
4331
if6_seq_next(struct seq_file * seq,void * v,loff_t * pos)4332 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4333 {
4334 struct inet6_ifaddr *ifa;
4335
4336 ifa = if6_get_next(seq, v);
4337 ++*pos;
4338 return ifa;
4339 }
4340
if6_seq_stop(struct seq_file * seq,void * v)4341 static void if6_seq_stop(struct seq_file *seq, void *v)
4342 __releases(rcu)
4343 {
4344 rcu_read_unlock();
4345 }
4346
if6_seq_show(struct seq_file * seq,void * v)4347 static int if6_seq_show(struct seq_file *seq, void *v)
4348 {
4349 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4350 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4351 &ifp->addr,
4352 ifp->idev->dev->ifindex,
4353 ifp->prefix_len,
4354 ifp->scope,
4355 (u8) ifp->flags,
4356 ifp->idev->dev->name);
4357 return 0;
4358 }
4359
4360 static const struct seq_operations if6_seq_ops = {
4361 .start = if6_seq_start,
4362 .next = if6_seq_next,
4363 .show = if6_seq_show,
4364 .stop = if6_seq_stop,
4365 };
4366
if6_proc_net_init(struct net * net)4367 static int __net_init if6_proc_net_init(struct net *net)
4368 {
4369 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4370 sizeof(struct if6_iter_state)))
4371 return -ENOMEM;
4372 return 0;
4373 }
4374
if6_proc_net_exit(struct net * net)4375 static void __net_exit if6_proc_net_exit(struct net *net)
4376 {
4377 remove_proc_entry("if_inet6", net->proc_net);
4378 }
4379
4380 static struct pernet_operations if6_proc_net_ops = {
4381 .init = if6_proc_net_init,
4382 .exit = if6_proc_net_exit,
4383 };
4384
if6_proc_init(void)4385 int __init if6_proc_init(void)
4386 {
4387 return register_pernet_subsys(&if6_proc_net_ops);
4388 }
4389
if6_proc_exit(void)4390 void if6_proc_exit(void)
4391 {
4392 unregister_pernet_subsys(&if6_proc_net_ops);
4393 }
4394 #endif /* CONFIG_PROC_FS */
4395
4396 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4397 /* Check if address is a home address configured on any interface. */
ipv6_chk_home_addr(struct net * net,const struct in6_addr * addr)4398 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4399 {
4400 unsigned int hash = inet6_addr_hash(net, addr);
4401 struct inet6_ifaddr *ifp = NULL;
4402 int ret = 0;
4403
4404 rcu_read_lock();
4405 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4406 if (!net_eq(dev_net(ifp->idev->dev), net))
4407 continue;
4408 if (ipv6_addr_equal(&ifp->addr, addr) &&
4409 (ifp->flags & IFA_F_HOMEADDRESS)) {
4410 ret = 1;
4411 break;
4412 }
4413 }
4414 rcu_read_unlock();
4415 return ret;
4416 }
4417 #endif
4418
4419 /*
4420 * Periodic address status verification
4421 */
4422
addrconf_verify_rtnl(void)4423 static void addrconf_verify_rtnl(void)
4424 {
4425 unsigned long now, next, next_sec, next_sched;
4426 struct inet6_ifaddr *ifp;
4427 int i;
4428
4429 ASSERT_RTNL();
4430
4431 rcu_read_lock_bh();
4432 now = jiffies;
4433 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4434
4435 cancel_delayed_work(&addr_chk_work);
4436
4437 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4438 restart:
4439 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4440 unsigned long age;
4441
4442 /* When setting preferred_lft to a value not zero or
4443 * infinity, while valid_lft is infinity
4444 * IFA_F_PERMANENT has a non-infinity life time.
4445 */
4446 if ((ifp->flags & IFA_F_PERMANENT) &&
4447 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4448 continue;
4449
4450 spin_lock(&ifp->lock);
4451 /* We try to batch several events at once. */
4452 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4453
4454 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4455 age >= ifp->valid_lft) {
4456 spin_unlock(&ifp->lock);
4457 in6_ifa_hold(ifp);
4458 ipv6_del_addr(ifp);
4459 goto restart;
4460 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4461 spin_unlock(&ifp->lock);
4462 continue;
4463 } else if (age >= ifp->prefered_lft) {
4464 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4465 int deprecate = 0;
4466
4467 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4468 deprecate = 1;
4469 ifp->flags |= IFA_F_DEPRECATED;
4470 }
4471
4472 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4473 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4474 next = ifp->tstamp + ifp->valid_lft * HZ;
4475
4476 spin_unlock(&ifp->lock);
4477
4478 if (deprecate) {
4479 in6_ifa_hold(ifp);
4480
4481 ipv6_ifa_notify(0, ifp);
4482 in6_ifa_put(ifp);
4483 goto restart;
4484 }
4485 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4486 !(ifp->flags&IFA_F_TENTATIVE)) {
4487 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4488 ifp->idev->cnf.dad_transmits *
4489 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4490
4491 if (age >= ifp->prefered_lft - regen_advance) {
4492 struct inet6_ifaddr *ifpub = ifp->ifpub;
4493 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4494 next = ifp->tstamp + ifp->prefered_lft * HZ;
4495 if (!ifp->regen_count && ifpub) {
4496 ifp->regen_count++;
4497 in6_ifa_hold(ifp);
4498 in6_ifa_hold(ifpub);
4499 spin_unlock(&ifp->lock);
4500
4501 spin_lock(&ifpub->lock);
4502 ifpub->regen_count = 0;
4503 spin_unlock(&ifpub->lock);
4504 rcu_read_unlock_bh();
4505 ipv6_create_tempaddr(ifpub, ifp, true);
4506 in6_ifa_put(ifpub);
4507 in6_ifa_put(ifp);
4508 rcu_read_lock_bh();
4509 goto restart;
4510 }
4511 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4512 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4513 spin_unlock(&ifp->lock);
4514 } else {
4515 /* ifp->prefered_lft <= ifp->valid_lft */
4516 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4517 next = ifp->tstamp + ifp->prefered_lft * HZ;
4518 spin_unlock(&ifp->lock);
4519 }
4520 }
4521 }
4522
4523 next_sec = round_jiffies_up(next);
4524 next_sched = next;
4525
4526 /* If rounded timeout is accurate enough, accept it. */
4527 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4528 next_sched = next_sec;
4529
4530 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4531 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4532 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4533
4534 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4535 now, next, next_sec, next_sched);
4536 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4537 rcu_read_unlock_bh();
4538 }
4539
addrconf_verify_work(struct work_struct * w)4540 static void addrconf_verify_work(struct work_struct *w)
4541 {
4542 rtnl_lock();
4543 addrconf_verify_rtnl();
4544 rtnl_unlock();
4545 }
4546
addrconf_verify(void)4547 static void addrconf_verify(void)
4548 {
4549 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4550 }
4551
extract_addr(struct nlattr * addr,struct nlattr * local,struct in6_addr ** peer_pfx)4552 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4553 struct in6_addr **peer_pfx)
4554 {
4555 struct in6_addr *pfx = NULL;
4556
4557 *peer_pfx = NULL;
4558
4559 if (addr)
4560 pfx = nla_data(addr);
4561
4562 if (local) {
4563 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4564 *peer_pfx = pfx;
4565 pfx = nla_data(local);
4566 }
4567
4568 return pfx;
4569 }
4570
4571 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4572 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4573 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4574 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4575 [IFA_FLAGS] = { .len = sizeof(u32) },
4576 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4577 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4578 };
4579
4580 static int
inet6_rtm_deladdr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4581 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4582 struct netlink_ext_ack *extack)
4583 {
4584 struct net *net = sock_net(skb->sk);
4585 struct ifaddrmsg *ifm;
4586 struct nlattr *tb[IFA_MAX+1];
4587 struct in6_addr *pfx, *peer_pfx;
4588 u32 ifa_flags;
4589 int err;
4590
4591 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4592 ifa_ipv6_policy, extack);
4593 if (err < 0)
4594 return err;
4595
4596 ifm = nlmsg_data(nlh);
4597 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4598 if (!pfx)
4599 return -EINVAL;
4600
4601 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4602
4603 /* We ignore other flags so far. */
4604 ifa_flags &= IFA_F_MANAGETEMPADDR;
4605
4606 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4607 ifm->ifa_prefixlen);
4608 }
4609
modify_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,u32 flags)4610 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4611 unsigned long expires, u32 flags)
4612 {
4613 struct fib6_info *f6i;
4614 u32 prio;
4615
4616 f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len,
4617 ifp->idev->dev, 0, RTF_DEFAULT, true);
4618 if (!f6i)
4619 return -ENOENT;
4620
4621 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4622 if (f6i->fib6_metric != prio) {
4623 /* delete old one */
4624 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4625
4626 /* add new one */
4627 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4628 ifp->rt_priority, ifp->idev->dev,
4629 expires, flags, GFP_KERNEL);
4630 } else {
4631 if (!expires)
4632 fib6_clean_expires(f6i);
4633 else
4634 fib6_set_expires(f6i, expires);
4635
4636 fib6_info_release(f6i);
4637 }
4638
4639 return 0;
4640 }
4641
inet6_addr_modify(struct inet6_ifaddr * ifp,struct ifa6_config * cfg)4642 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4643 {
4644 u32 flags;
4645 clock_t expires;
4646 unsigned long timeout;
4647 bool was_managetempaddr;
4648 bool had_prefixroute;
4649
4650 ASSERT_RTNL();
4651
4652 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4653 return -EINVAL;
4654
4655 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4656 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4657 return -EINVAL;
4658
4659 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4660 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4661
4662 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4663 if (addrconf_finite_timeout(timeout)) {
4664 expires = jiffies_to_clock_t(timeout * HZ);
4665 cfg->valid_lft = timeout;
4666 flags = RTF_EXPIRES;
4667 } else {
4668 expires = 0;
4669 flags = 0;
4670 cfg->ifa_flags |= IFA_F_PERMANENT;
4671 }
4672
4673 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4674 if (addrconf_finite_timeout(timeout)) {
4675 if (timeout == 0)
4676 cfg->ifa_flags |= IFA_F_DEPRECATED;
4677 cfg->preferred_lft = timeout;
4678 }
4679
4680 spin_lock_bh(&ifp->lock);
4681 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4682 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4683 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4684 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4685 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4686 IFA_F_NOPREFIXROUTE);
4687 ifp->flags |= cfg->ifa_flags;
4688 ifp->tstamp = jiffies;
4689 ifp->valid_lft = cfg->valid_lft;
4690 ifp->prefered_lft = cfg->preferred_lft;
4691
4692 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4693 ifp->rt_priority = cfg->rt_priority;
4694
4695 spin_unlock_bh(&ifp->lock);
4696 if (!(ifp->flags&IFA_F_TENTATIVE))
4697 ipv6_ifa_notify(0, ifp);
4698
4699 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4700 int rc = -ENOENT;
4701
4702 if (had_prefixroute)
4703 rc = modify_prefix_route(ifp, expires, flags);
4704
4705 /* prefix route could have been deleted; if so restore it */
4706 if (rc == -ENOENT) {
4707 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4708 ifp->rt_priority, ifp->idev->dev,
4709 expires, flags, GFP_KERNEL);
4710 }
4711 } else if (had_prefixroute) {
4712 enum cleanup_prefix_rt_t action;
4713 unsigned long rt_expires;
4714
4715 write_lock_bh(&ifp->idev->lock);
4716 action = check_cleanup_prefix_route(ifp, &rt_expires);
4717 write_unlock_bh(&ifp->idev->lock);
4718
4719 if (action != CLEANUP_PREFIX_RT_NOP) {
4720 cleanup_prefix_route(ifp, rt_expires,
4721 action == CLEANUP_PREFIX_RT_DEL);
4722 }
4723 }
4724
4725 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4726 if (was_managetempaddr &&
4727 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4728 cfg->valid_lft = 0;
4729 cfg->preferred_lft = 0;
4730 }
4731 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4732 cfg->preferred_lft, !was_managetempaddr,
4733 jiffies);
4734 }
4735
4736 addrconf_verify_rtnl();
4737
4738 return 0;
4739 }
4740
4741 static int
inet6_rtm_newaddr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4742 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4743 struct netlink_ext_ack *extack)
4744 {
4745 struct net *net = sock_net(skb->sk);
4746 struct ifaddrmsg *ifm;
4747 struct nlattr *tb[IFA_MAX+1];
4748 struct in6_addr *peer_pfx;
4749 struct inet6_ifaddr *ifa;
4750 struct net_device *dev;
4751 struct inet6_dev *idev;
4752 struct ifa6_config cfg;
4753 int err;
4754
4755 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4756 ifa_ipv6_policy, extack);
4757 if (err < 0)
4758 return err;
4759
4760 memset(&cfg, 0, sizeof(cfg));
4761
4762 ifm = nlmsg_data(nlh);
4763 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4764 if (!cfg.pfx)
4765 return -EINVAL;
4766
4767 cfg.peer_pfx = peer_pfx;
4768 cfg.plen = ifm->ifa_prefixlen;
4769 if (tb[IFA_RT_PRIORITY])
4770 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4771
4772 cfg.valid_lft = INFINITY_LIFE_TIME;
4773 cfg.preferred_lft = INFINITY_LIFE_TIME;
4774
4775 if (tb[IFA_CACHEINFO]) {
4776 struct ifa_cacheinfo *ci;
4777
4778 ci = nla_data(tb[IFA_CACHEINFO]);
4779 cfg.valid_lft = ci->ifa_valid;
4780 cfg.preferred_lft = ci->ifa_prefered;
4781 }
4782
4783 dev = __dev_get_by_index(net, ifm->ifa_index);
4784 if (!dev)
4785 return -ENODEV;
4786
4787 if (tb[IFA_FLAGS])
4788 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4789 else
4790 cfg.ifa_flags = ifm->ifa_flags;
4791
4792 /* We ignore other flags so far. */
4793 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4794 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4795 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4796
4797 idev = ipv6_find_idev(dev);
4798 if (IS_ERR(idev))
4799 return PTR_ERR(idev);
4800
4801 if (!ipv6_allow_optimistic_dad(net, idev))
4802 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4803
4804 if (cfg.ifa_flags & IFA_F_NODAD &&
4805 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4806 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4807 return -EINVAL;
4808 }
4809
4810 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4811 if (!ifa) {
4812 /*
4813 * It would be best to check for !NLM_F_CREATE here but
4814 * userspace already relies on not having to provide this.
4815 */
4816 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4817 }
4818
4819 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4820 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4821 err = -EEXIST;
4822 else
4823 err = inet6_addr_modify(ifa, &cfg);
4824
4825 in6_ifa_put(ifa);
4826
4827 return err;
4828 }
4829
put_ifaddrmsg(struct nlmsghdr * nlh,u8 prefixlen,u32 flags,u8 scope,int ifindex)4830 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4831 u8 scope, int ifindex)
4832 {
4833 struct ifaddrmsg *ifm;
4834
4835 ifm = nlmsg_data(nlh);
4836 ifm->ifa_family = AF_INET6;
4837 ifm->ifa_prefixlen = prefixlen;
4838 ifm->ifa_flags = flags;
4839 ifm->ifa_scope = scope;
4840 ifm->ifa_index = ifindex;
4841 }
4842
put_cacheinfo(struct sk_buff * skb,unsigned long cstamp,unsigned long tstamp,u32 preferred,u32 valid)4843 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4844 unsigned long tstamp, u32 preferred, u32 valid)
4845 {
4846 struct ifa_cacheinfo ci;
4847
4848 ci.cstamp = cstamp_delta(cstamp);
4849 ci.tstamp = cstamp_delta(tstamp);
4850 ci.ifa_prefered = preferred;
4851 ci.ifa_valid = valid;
4852
4853 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4854 }
4855
rt_scope(int ifa_scope)4856 static inline int rt_scope(int ifa_scope)
4857 {
4858 if (ifa_scope & IFA_HOST)
4859 return RT_SCOPE_HOST;
4860 else if (ifa_scope & IFA_LINK)
4861 return RT_SCOPE_LINK;
4862 else if (ifa_scope & IFA_SITE)
4863 return RT_SCOPE_SITE;
4864 else
4865 return RT_SCOPE_UNIVERSE;
4866 }
4867
inet6_ifaddr_msgsize(void)4868 static inline int inet6_ifaddr_msgsize(void)
4869 {
4870 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4871 + nla_total_size(16) /* IFA_LOCAL */
4872 + nla_total_size(16) /* IFA_ADDRESS */
4873 + nla_total_size(sizeof(struct ifa_cacheinfo))
4874 + nla_total_size(4) /* IFA_FLAGS */
4875 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4876 }
4877
4878 enum addr_type_t {
4879 UNICAST_ADDR,
4880 MULTICAST_ADDR,
4881 ANYCAST_ADDR,
4882 };
4883
4884 struct inet6_fill_args {
4885 u32 portid;
4886 u32 seq;
4887 int event;
4888 unsigned int flags;
4889 int netnsid;
4890 int ifindex;
4891 enum addr_type_t type;
4892 };
4893
inet6_fill_ifaddr(struct sk_buff * skb,struct inet6_ifaddr * ifa,struct inet6_fill_args * args)4894 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4895 struct inet6_fill_args *args)
4896 {
4897 struct nlmsghdr *nlh;
4898 u32 preferred, valid;
4899
4900 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4901 sizeof(struct ifaddrmsg), args->flags);
4902 if (!nlh)
4903 return -EMSGSIZE;
4904
4905 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4906 ifa->idev->dev->ifindex);
4907
4908 if (args->netnsid >= 0 &&
4909 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4910 goto error;
4911
4912 if (!((ifa->flags&IFA_F_PERMANENT) &&
4913 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4914 preferred = ifa->prefered_lft;
4915 valid = ifa->valid_lft;
4916 if (preferred != INFINITY_LIFE_TIME) {
4917 long tval = (jiffies - ifa->tstamp)/HZ;
4918 if (preferred > tval)
4919 preferred -= tval;
4920 else
4921 preferred = 0;
4922 if (valid != INFINITY_LIFE_TIME) {
4923 if (valid > tval)
4924 valid -= tval;
4925 else
4926 valid = 0;
4927 }
4928 }
4929 } else {
4930 preferred = INFINITY_LIFE_TIME;
4931 valid = INFINITY_LIFE_TIME;
4932 }
4933
4934 if (!ipv6_addr_any(&ifa->peer_addr)) {
4935 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4936 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4937 goto error;
4938 } else
4939 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4940 goto error;
4941
4942 if (ifa->rt_priority &&
4943 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4944 goto error;
4945
4946 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4947 goto error;
4948
4949 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4950 goto error;
4951
4952 nlmsg_end(skb, nlh);
4953 return 0;
4954
4955 error:
4956 nlmsg_cancel(skb, nlh);
4957 return -EMSGSIZE;
4958 }
4959
inet6_fill_ifmcaddr(struct sk_buff * skb,struct ifmcaddr6 * ifmca,struct inet6_fill_args * args)4960 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4961 struct inet6_fill_args *args)
4962 {
4963 struct nlmsghdr *nlh;
4964 u8 scope = RT_SCOPE_UNIVERSE;
4965 int ifindex = ifmca->idev->dev->ifindex;
4966
4967 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4968 scope = RT_SCOPE_SITE;
4969
4970 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4971 sizeof(struct ifaddrmsg), args->flags);
4972 if (!nlh)
4973 return -EMSGSIZE;
4974
4975 if (args->netnsid >= 0 &&
4976 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4977 return -EMSGSIZE;
4978
4979 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4980 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4981 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4982 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4983 nlmsg_cancel(skb, nlh);
4984 return -EMSGSIZE;
4985 }
4986
4987 nlmsg_end(skb, nlh);
4988 return 0;
4989 }
4990
inet6_fill_ifacaddr(struct sk_buff * skb,struct ifacaddr6 * ifaca,struct inet6_fill_args * args)4991 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4992 struct inet6_fill_args *args)
4993 {
4994 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4995 int ifindex = dev ? dev->ifindex : 1;
4996 struct nlmsghdr *nlh;
4997 u8 scope = RT_SCOPE_UNIVERSE;
4998
4999 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5000 scope = RT_SCOPE_SITE;
5001
5002 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5003 sizeof(struct ifaddrmsg), args->flags);
5004 if (!nlh)
5005 return -EMSGSIZE;
5006
5007 if (args->netnsid >= 0 &&
5008 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5009 return -EMSGSIZE;
5010
5011 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5012 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5013 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5014 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5015 nlmsg_cancel(skb, nlh);
5016 return -EMSGSIZE;
5017 }
5018
5019 nlmsg_end(skb, nlh);
5020 return 0;
5021 }
5022
5023 /* called with rcu_read_lock() */
in6_dump_addrs(struct inet6_dev * idev,struct sk_buff * skb,struct netlink_callback * cb,int s_ip_idx,struct inet6_fill_args * fillargs)5024 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5025 struct netlink_callback *cb, int s_ip_idx,
5026 struct inet6_fill_args *fillargs)
5027 {
5028 struct ifmcaddr6 *ifmca;
5029 struct ifacaddr6 *ifaca;
5030 int ip_idx = 0;
5031 int err = 1;
5032
5033 read_lock_bh(&idev->lock);
5034 switch (fillargs->type) {
5035 case UNICAST_ADDR: {
5036 struct inet6_ifaddr *ifa;
5037 fillargs->event = RTM_NEWADDR;
5038
5039 /* unicast address incl. temp addr */
5040 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5041 if (ip_idx < s_ip_idx)
5042 goto next;
5043 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5044 if (err < 0)
5045 break;
5046 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5047 next:
5048 ip_idx++;
5049 }
5050 break;
5051 }
5052 case MULTICAST_ADDR:
5053 fillargs->event = RTM_GETMULTICAST;
5054
5055 /* multicast address */
5056 for (ifmca = idev->mc_list; ifmca;
5057 ifmca = ifmca->next, ip_idx++) {
5058 if (ip_idx < s_ip_idx)
5059 continue;
5060 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5061 if (err < 0)
5062 break;
5063 }
5064 break;
5065 case ANYCAST_ADDR:
5066 fillargs->event = RTM_GETANYCAST;
5067 /* anycast address */
5068 for (ifaca = idev->ac_list; ifaca;
5069 ifaca = ifaca->aca_next, ip_idx++) {
5070 if (ip_idx < s_ip_idx)
5071 continue;
5072 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5073 if (err < 0)
5074 break;
5075 }
5076 break;
5077 default:
5078 break;
5079 }
5080 read_unlock_bh(&idev->lock);
5081 cb->args[2] = ip_idx;
5082 return err;
5083 }
5084
inet6_valid_dump_ifaddr_req(const struct nlmsghdr * nlh,struct inet6_fill_args * fillargs,struct net ** tgt_net,struct sock * sk,struct netlink_callback * cb)5085 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5086 struct inet6_fill_args *fillargs,
5087 struct net **tgt_net, struct sock *sk,
5088 struct netlink_callback *cb)
5089 {
5090 struct netlink_ext_ack *extack = cb->extack;
5091 struct nlattr *tb[IFA_MAX+1];
5092 struct ifaddrmsg *ifm;
5093 int err, i;
5094
5095 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5096 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5097 return -EINVAL;
5098 }
5099
5100 ifm = nlmsg_data(nlh);
5101 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5102 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5103 return -EINVAL;
5104 }
5105
5106 fillargs->ifindex = ifm->ifa_index;
5107 if (fillargs->ifindex) {
5108 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5109 fillargs->flags |= NLM_F_DUMP_FILTERED;
5110 }
5111
5112 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5113 ifa_ipv6_policy, extack);
5114 if (err < 0)
5115 return err;
5116
5117 for (i = 0; i <= IFA_MAX; ++i) {
5118 if (!tb[i])
5119 continue;
5120
5121 if (i == IFA_TARGET_NETNSID) {
5122 struct net *net;
5123
5124 fillargs->netnsid = nla_get_s32(tb[i]);
5125 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5126 if (IS_ERR(net)) {
5127 fillargs->netnsid = -1;
5128 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5129 return PTR_ERR(net);
5130 }
5131 *tgt_net = net;
5132 } else {
5133 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5134 return -EINVAL;
5135 }
5136 }
5137
5138 return 0;
5139 }
5140
inet6_dump_addr(struct sk_buff * skb,struct netlink_callback * cb,enum addr_type_t type)5141 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5142 enum addr_type_t type)
5143 {
5144 const struct nlmsghdr *nlh = cb->nlh;
5145 struct inet6_fill_args fillargs = {
5146 .portid = NETLINK_CB(cb->skb).portid,
5147 .seq = cb->nlh->nlmsg_seq,
5148 .flags = NLM_F_MULTI,
5149 .netnsid = -1,
5150 .type = type,
5151 };
5152 struct net *net = sock_net(skb->sk);
5153 struct net *tgt_net = net;
5154 int idx, s_idx, s_ip_idx;
5155 int h, s_h;
5156 struct net_device *dev;
5157 struct inet6_dev *idev;
5158 struct hlist_head *head;
5159 int err = 0;
5160
5161 s_h = cb->args[0];
5162 s_idx = idx = cb->args[1];
5163 s_ip_idx = cb->args[2];
5164
5165 if (cb->strict_check) {
5166 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5167 skb->sk, cb);
5168 if (err < 0)
5169 goto put_tgt_net;
5170
5171 err = 0;
5172 if (fillargs.ifindex) {
5173 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5174 if (!dev) {
5175 err = -ENODEV;
5176 goto put_tgt_net;
5177 }
5178 idev = __in6_dev_get(dev);
5179 if (idev) {
5180 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5181 &fillargs);
5182 if (err > 0)
5183 err = 0;
5184 }
5185 goto put_tgt_net;
5186 }
5187 }
5188
5189 rcu_read_lock();
5190 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5191 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5192 idx = 0;
5193 head = &tgt_net->dev_index_head[h];
5194 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5195 if (idx < s_idx)
5196 goto cont;
5197 if (h > s_h || idx > s_idx)
5198 s_ip_idx = 0;
5199 idev = __in6_dev_get(dev);
5200 if (!idev)
5201 goto cont;
5202
5203 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5204 &fillargs) < 0)
5205 goto done;
5206 cont:
5207 idx++;
5208 }
5209 }
5210 done:
5211 rcu_read_unlock();
5212 cb->args[0] = h;
5213 cb->args[1] = idx;
5214 put_tgt_net:
5215 if (fillargs.netnsid >= 0)
5216 put_net(tgt_net);
5217
5218 return skb->len ? : err;
5219 }
5220
inet6_dump_ifaddr(struct sk_buff * skb,struct netlink_callback * cb)5221 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5222 {
5223 enum addr_type_t type = UNICAST_ADDR;
5224
5225 return inet6_dump_addr(skb, cb, type);
5226 }
5227
inet6_dump_ifmcaddr(struct sk_buff * skb,struct netlink_callback * cb)5228 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5229 {
5230 enum addr_type_t type = MULTICAST_ADDR;
5231
5232 return inet6_dump_addr(skb, cb, type);
5233 }
5234
5235
inet6_dump_ifacaddr(struct sk_buff * skb,struct netlink_callback * cb)5236 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5237 {
5238 enum addr_type_t type = ANYCAST_ADDR;
5239
5240 return inet6_dump_addr(skb, cb, type);
5241 }
5242
inet6_rtm_valid_getaddr_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)5243 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5244 const struct nlmsghdr *nlh,
5245 struct nlattr **tb,
5246 struct netlink_ext_ack *extack)
5247 {
5248 struct ifaddrmsg *ifm;
5249 int i, err;
5250
5251 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5252 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5253 return -EINVAL;
5254 }
5255
5256 if (!netlink_strict_get_check(skb))
5257 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5258 ifa_ipv6_policy, extack);
5259
5260 ifm = nlmsg_data(nlh);
5261 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5262 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5263 return -EINVAL;
5264 }
5265
5266 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5267 ifa_ipv6_policy, extack);
5268 if (err)
5269 return err;
5270
5271 for (i = 0; i <= IFA_MAX; i++) {
5272 if (!tb[i])
5273 continue;
5274
5275 switch (i) {
5276 case IFA_TARGET_NETNSID:
5277 case IFA_ADDRESS:
5278 case IFA_LOCAL:
5279 break;
5280 default:
5281 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5282 return -EINVAL;
5283 }
5284 }
5285
5286 return 0;
5287 }
5288
inet6_rtm_getaddr(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5289 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5290 struct netlink_ext_ack *extack)
5291 {
5292 struct net *net = sock_net(in_skb->sk);
5293 struct inet6_fill_args fillargs = {
5294 .portid = NETLINK_CB(in_skb).portid,
5295 .seq = nlh->nlmsg_seq,
5296 .event = RTM_NEWADDR,
5297 .flags = 0,
5298 .netnsid = -1,
5299 };
5300 struct net *tgt_net = net;
5301 struct ifaddrmsg *ifm;
5302 struct nlattr *tb[IFA_MAX+1];
5303 struct in6_addr *addr = NULL, *peer;
5304 struct net_device *dev = NULL;
5305 struct inet6_ifaddr *ifa;
5306 struct sk_buff *skb;
5307 int err;
5308
5309 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5310 if (err < 0)
5311 return err;
5312
5313 if (tb[IFA_TARGET_NETNSID]) {
5314 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5315
5316 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5317 fillargs.netnsid);
5318 if (IS_ERR(tgt_net))
5319 return PTR_ERR(tgt_net);
5320 }
5321
5322 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5323 if (!addr)
5324 return -EINVAL;
5325
5326 ifm = nlmsg_data(nlh);
5327 if (ifm->ifa_index)
5328 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5329
5330 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5331 if (!ifa) {
5332 err = -EADDRNOTAVAIL;
5333 goto errout;
5334 }
5335
5336 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5337 if (!skb) {
5338 err = -ENOBUFS;
5339 goto errout_ifa;
5340 }
5341
5342 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5343 if (err < 0) {
5344 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5345 WARN_ON(err == -EMSGSIZE);
5346 kfree_skb(skb);
5347 goto errout_ifa;
5348 }
5349 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5350 errout_ifa:
5351 in6_ifa_put(ifa);
5352 errout:
5353 if (dev)
5354 dev_put(dev);
5355 if (fillargs.netnsid >= 0)
5356 put_net(tgt_net);
5357
5358 return err;
5359 }
5360
inet6_ifa_notify(int event,struct inet6_ifaddr * ifa)5361 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5362 {
5363 struct sk_buff *skb;
5364 struct net *net = dev_net(ifa->idev->dev);
5365 struct inet6_fill_args fillargs = {
5366 .portid = 0,
5367 .seq = 0,
5368 .event = event,
5369 .flags = 0,
5370 .netnsid = -1,
5371 };
5372 int err = -ENOBUFS;
5373
5374 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5375 if (!skb)
5376 goto errout;
5377
5378 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5379 if (err < 0) {
5380 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5381 WARN_ON(err == -EMSGSIZE);
5382 kfree_skb(skb);
5383 goto errout;
5384 }
5385 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5386 return;
5387 errout:
5388 if (err < 0)
5389 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5390 }
5391
ipv6_store_devconf(struct ipv6_devconf * cnf,__s32 * array,int bytes)5392 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5393 __s32 *array, int bytes)
5394 {
5395 BUG_ON(bytes < (DEVCONF_MAX * 4));
5396
5397 memset(array, 0, bytes);
5398 array[DEVCONF_FORWARDING] = cnf->forwarding;
5399 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5400 array[DEVCONF_MTU6] = cnf->mtu6;
5401 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5402 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5403 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5404 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5405 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5406 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5407 jiffies_to_msecs(cnf->rtr_solicit_interval);
5408 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5409 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5410 array[DEVCONF_RTR_SOLICIT_DELAY] =
5411 jiffies_to_msecs(cnf->rtr_solicit_delay);
5412 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5413 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5414 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5415 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5416 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5417 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5418 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5419 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5420 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5421 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5422 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5423 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5424 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5425 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5426 #ifdef CONFIG_IPV6_ROUTER_PREF
5427 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5428 array[DEVCONF_RTR_PROBE_INTERVAL] =
5429 jiffies_to_msecs(cnf->rtr_probe_interval);
5430 #ifdef CONFIG_IPV6_ROUTE_INFO
5431 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5432 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5433 #endif
5434 #endif
5435 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5436 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5437 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5438 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5439 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5440 #endif
5441 #ifdef CONFIG_IPV6_MROUTE
5442 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5443 #endif
5444 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5445 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5446 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5447 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5448 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5449 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5450 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5451 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5452 /* we omit DEVCONF_STABLE_SECRET for now */
5453 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5454 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5455 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5456 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5457 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5458 #ifdef CONFIG_IPV6_SEG6_HMAC
5459 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5460 #endif
5461 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5462 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5463 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5464 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5465 }
5466
inet6_ifla6_size(void)5467 static inline size_t inet6_ifla6_size(void)
5468 {
5469 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5470 + nla_total_size(sizeof(struct ifla_cacheinfo))
5471 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5472 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5473 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5474 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5475 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5476 + 0;
5477 }
5478
inet6_if_nlmsg_size(void)5479 static inline size_t inet6_if_nlmsg_size(void)
5480 {
5481 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5482 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5483 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5484 + nla_total_size(4) /* IFLA_MTU */
5485 + nla_total_size(4) /* IFLA_LINK */
5486 + nla_total_size(1) /* IFLA_OPERSTATE */
5487 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5488 }
5489
__snmp6_fill_statsdev(u64 * stats,atomic_long_t * mib,int bytes)5490 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5491 int bytes)
5492 {
5493 int i;
5494 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5495 BUG_ON(pad < 0);
5496
5497 /* Use put_unaligned() because stats may not be aligned for u64. */
5498 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5499 for (i = 1; i < ICMP6_MIB_MAX; i++)
5500 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5501
5502 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5503 }
5504
__snmp6_fill_stats64(u64 * stats,void __percpu * mib,int bytes,size_t syncpoff)5505 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5506 int bytes, size_t syncpoff)
5507 {
5508 int i, c;
5509 u64 buff[IPSTATS_MIB_MAX];
5510 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5511
5512 BUG_ON(pad < 0);
5513
5514 memset(buff, 0, sizeof(buff));
5515 buff[0] = IPSTATS_MIB_MAX;
5516
5517 for_each_possible_cpu(c) {
5518 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5519 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5520 }
5521
5522 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5523 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5524 }
5525
snmp6_fill_stats(u64 * stats,struct inet6_dev * idev,int attrtype,int bytes)5526 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5527 int bytes)
5528 {
5529 switch (attrtype) {
5530 case IFLA_INET6_STATS:
5531 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5532 offsetof(struct ipstats_mib, syncp));
5533 break;
5534 case IFLA_INET6_ICMP6STATS:
5535 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5536 break;
5537 }
5538 }
5539
inet6_fill_ifla6_attrs(struct sk_buff * skb,struct inet6_dev * idev,u32 ext_filter_mask)5540 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5541 u32 ext_filter_mask)
5542 {
5543 struct nlattr *nla;
5544 struct ifla_cacheinfo ci;
5545
5546 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5547 goto nla_put_failure;
5548 ci.max_reasm_len = IPV6_MAXPLEN;
5549 ci.tstamp = cstamp_delta(idev->tstamp);
5550 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5551 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5552 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5553 goto nla_put_failure;
5554 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5555 if (!nla)
5556 goto nla_put_failure;
5557 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5558
5559 /* XXX - MC not implemented */
5560
5561 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5562 return 0;
5563
5564 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5565 if (!nla)
5566 goto nla_put_failure;
5567 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5568
5569 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5570 if (!nla)
5571 goto nla_put_failure;
5572 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5573
5574 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5575 if (!nla)
5576 goto nla_put_failure;
5577
5578 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5579 goto nla_put_failure;
5580
5581 read_lock_bh(&idev->lock);
5582 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5583 read_unlock_bh(&idev->lock);
5584
5585 return 0;
5586
5587 nla_put_failure:
5588 return -EMSGSIZE;
5589 }
5590
inet6_get_link_af_size(const struct net_device * dev,u32 ext_filter_mask)5591 static size_t inet6_get_link_af_size(const struct net_device *dev,
5592 u32 ext_filter_mask)
5593 {
5594 if (!__in6_dev_get(dev))
5595 return 0;
5596
5597 return inet6_ifla6_size();
5598 }
5599
inet6_fill_link_af(struct sk_buff * skb,const struct net_device * dev,u32 ext_filter_mask)5600 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5601 u32 ext_filter_mask)
5602 {
5603 struct inet6_dev *idev = __in6_dev_get(dev);
5604
5605 if (!idev)
5606 return -ENODATA;
5607
5608 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5609 return -EMSGSIZE;
5610
5611 return 0;
5612 }
5613
inet6_set_iftoken(struct inet6_dev * idev,struct in6_addr * token)5614 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5615 {
5616 struct inet6_ifaddr *ifp;
5617 struct net_device *dev = idev->dev;
5618 bool clear_token, update_rs = false;
5619 struct in6_addr ll_addr;
5620
5621 ASSERT_RTNL();
5622
5623 if (!token)
5624 return -EINVAL;
5625 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5626 return -EINVAL;
5627 if (!ipv6_accept_ra(idev))
5628 return -EINVAL;
5629 if (idev->cnf.rtr_solicits == 0)
5630 return -EINVAL;
5631
5632 write_lock_bh(&idev->lock);
5633
5634 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5635 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5636
5637 write_unlock_bh(&idev->lock);
5638
5639 clear_token = ipv6_addr_any(token);
5640 if (clear_token)
5641 goto update_lft;
5642
5643 if (!idev->dead && (idev->if_flags & IF_READY) &&
5644 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5645 IFA_F_OPTIMISTIC)) {
5646 /* If we're not ready, then normal ifup will take care
5647 * of this. Otherwise, we need to request our rs here.
5648 */
5649 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5650 update_rs = true;
5651 }
5652
5653 update_lft:
5654 write_lock_bh(&idev->lock);
5655
5656 if (update_rs) {
5657 idev->if_flags |= IF_RS_SENT;
5658 idev->rs_interval = rfc3315_s14_backoff_init(
5659 idev->cnf.rtr_solicit_interval);
5660 idev->rs_probes = 1;
5661 addrconf_mod_rs_timer(idev, idev->rs_interval);
5662 }
5663
5664 /* Well, that's kinda nasty ... */
5665 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5666 spin_lock(&ifp->lock);
5667 if (ifp->tokenized) {
5668 ifp->valid_lft = 0;
5669 ifp->prefered_lft = 0;
5670 }
5671 spin_unlock(&ifp->lock);
5672 }
5673
5674 write_unlock_bh(&idev->lock);
5675 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5676 addrconf_verify_rtnl();
5677 return 0;
5678 }
5679
5680 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5681 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5682 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5683 };
5684
check_addr_gen_mode(int mode)5685 static int check_addr_gen_mode(int mode)
5686 {
5687 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5688 mode != IN6_ADDR_GEN_MODE_NONE &&
5689 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5690 mode != IN6_ADDR_GEN_MODE_RANDOM)
5691 return -EINVAL;
5692 return 1;
5693 }
5694
check_stable_privacy(struct inet6_dev * idev,struct net * net,int mode)5695 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5696 int mode)
5697 {
5698 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5699 !idev->cnf.stable_secret.initialized &&
5700 !net->ipv6.devconf_dflt->stable_secret.initialized)
5701 return -EINVAL;
5702 return 1;
5703 }
5704
inet6_validate_link_af(const struct net_device * dev,const struct nlattr * nla)5705 static int inet6_validate_link_af(const struct net_device *dev,
5706 const struct nlattr *nla)
5707 {
5708 struct nlattr *tb[IFLA_INET6_MAX + 1];
5709 struct inet6_dev *idev = NULL;
5710 int err;
5711
5712 if (dev) {
5713 idev = __in6_dev_get(dev);
5714 if (!idev)
5715 return -EAFNOSUPPORT;
5716 }
5717
5718 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5719 inet6_af_policy, NULL);
5720 if (err)
5721 return err;
5722
5723 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5724 return -EINVAL;
5725
5726 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5727 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5728
5729 if (check_addr_gen_mode(mode) < 0)
5730 return -EINVAL;
5731 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5732 return -EINVAL;
5733 }
5734
5735 return 0;
5736 }
5737
inet6_set_link_af(struct net_device * dev,const struct nlattr * nla)5738 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5739 {
5740 struct inet6_dev *idev = __in6_dev_get(dev);
5741 struct nlattr *tb[IFLA_INET6_MAX + 1];
5742 int err;
5743
5744 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5745 BUG();
5746
5747 if (tb[IFLA_INET6_TOKEN]) {
5748 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5749 if (err)
5750 return err;
5751 }
5752
5753 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5754 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5755
5756 idev->cnf.addr_gen_mode = mode;
5757 }
5758
5759 return 0;
5760 }
5761
inet6_fill_ifinfo(struct sk_buff * skb,struct inet6_dev * idev,u32 portid,u32 seq,int event,unsigned int flags)5762 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5763 u32 portid, u32 seq, int event, unsigned int flags)
5764 {
5765 struct net_device *dev = idev->dev;
5766 struct ifinfomsg *hdr;
5767 struct nlmsghdr *nlh;
5768 void *protoinfo;
5769
5770 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5771 if (!nlh)
5772 return -EMSGSIZE;
5773
5774 hdr = nlmsg_data(nlh);
5775 hdr->ifi_family = AF_INET6;
5776 hdr->__ifi_pad = 0;
5777 hdr->ifi_type = dev->type;
5778 hdr->ifi_index = dev->ifindex;
5779 hdr->ifi_flags = dev_get_flags(dev);
5780 hdr->ifi_change = 0;
5781
5782 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5783 (dev->addr_len &&
5784 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5785 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5786 (dev->ifindex != dev_get_iflink(dev) &&
5787 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5788 nla_put_u8(skb, IFLA_OPERSTATE,
5789 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5790 goto nla_put_failure;
5791 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5792 if (!protoinfo)
5793 goto nla_put_failure;
5794
5795 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5796 goto nla_put_failure;
5797
5798 nla_nest_end(skb, protoinfo);
5799 nlmsg_end(skb, nlh);
5800 return 0;
5801
5802 nla_put_failure:
5803 nlmsg_cancel(skb, nlh);
5804 return -EMSGSIZE;
5805 }
5806
inet6_valid_dump_ifinfo(const struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5807 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5808 struct netlink_ext_ack *extack)
5809 {
5810 struct ifinfomsg *ifm;
5811
5812 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5813 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5814 return -EINVAL;
5815 }
5816
5817 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5818 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5819 return -EINVAL;
5820 }
5821
5822 ifm = nlmsg_data(nlh);
5823 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5824 ifm->ifi_change || ifm->ifi_index) {
5825 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5826 return -EINVAL;
5827 }
5828
5829 return 0;
5830 }
5831
inet6_dump_ifinfo(struct sk_buff * skb,struct netlink_callback * cb)5832 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5833 {
5834 struct net *net = sock_net(skb->sk);
5835 int h, s_h;
5836 int idx = 0, s_idx;
5837 struct net_device *dev;
5838 struct inet6_dev *idev;
5839 struct hlist_head *head;
5840
5841 /* only requests using strict checking can pass data to
5842 * influence the dump
5843 */
5844 if (cb->strict_check) {
5845 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5846
5847 if (err < 0)
5848 return err;
5849 }
5850
5851 s_h = cb->args[0];
5852 s_idx = cb->args[1];
5853
5854 rcu_read_lock();
5855 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5856 idx = 0;
5857 head = &net->dev_index_head[h];
5858 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5859 if (idx < s_idx)
5860 goto cont;
5861 idev = __in6_dev_get(dev);
5862 if (!idev)
5863 goto cont;
5864 if (inet6_fill_ifinfo(skb, idev,
5865 NETLINK_CB(cb->skb).portid,
5866 cb->nlh->nlmsg_seq,
5867 RTM_NEWLINK, NLM_F_MULTI) < 0)
5868 goto out;
5869 cont:
5870 idx++;
5871 }
5872 }
5873 out:
5874 rcu_read_unlock();
5875 cb->args[1] = idx;
5876 cb->args[0] = h;
5877
5878 return skb->len;
5879 }
5880
inet6_ifinfo_notify(int event,struct inet6_dev * idev)5881 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5882 {
5883 struct sk_buff *skb;
5884 struct net *net = dev_net(idev->dev);
5885 int err = -ENOBUFS;
5886
5887 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5888 if (!skb)
5889 goto errout;
5890
5891 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5892 if (err < 0) {
5893 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5894 WARN_ON(err == -EMSGSIZE);
5895 kfree_skb(skb);
5896 goto errout;
5897 }
5898 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5899 return;
5900 errout:
5901 if (err < 0)
5902 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5903 }
5904
inet6_prefix_nlmsg_size(void)5905 static inline size_t inet6_prefix_nlmsg_size(void)
5906 {
5907 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5908 + nla_total_size(sizeof(struct in6_addr))
5909 + nla_total_size(sizeof(struct prefix_cacheinfo));
5910 }
5911
inet6_fill_prefix(struct sk_buff * skb,struct inet6_dev * idev,struct prefix_info * pinfo,u32 portid,u32 seq,int event,unsigned int flags)5912 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5913 struct prefix_info *pinfo, u32 portid, u32 seq,
5914 int event, unsigned int flags)
5915 {
5916 struct prefixmsg *pmsg;
5917 struct nlmsghdr *nlh;
5918 struct prefix_cacheinfo ci;
5919
5920 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5921 if (!nlh)
5922 return -EMSGSIZE;
5923
5924 pmsg = nlmsg_data(nlh);
5925 pmsg->prefix_family = AF_INET6;
5926 pmsg->prefix_pad1 = 0;
5927 pmsg->prefix_pad2 = 0;
5928 pmsg->prefix_ifindex = idev->dev->ifindex;
5929 pmsg->prefix_len = pinfo->prefix_len;
5930 pmsg->prefix_type = pinfo->type;
5931 pmsg->prefix_pad3 = 0;
5932 pmsg->prefix_flags = 0;
5933 if (pinfo->onlink)
5934 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5935 if (pinfo->autoconf)
5936 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5937
5938 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5939 goto nla_put_failure;
5940 ci.preferred_time = ntohl(pinfo->prefered);
5941 ci.valid_time = ntohl(pinfo->valid);
5942 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5943 goto nla_put_failure;
5944 nlmsg_end(skb, nlh);
5945 return 0;
5946
5947 nla_put_failure:
5948 nlmsg_cancel(skb, nlh);
5949 return -EMSGSIZE;
5950 }
5951
inet6_prefix_notify(int event,struct inet6_dev * idev,struct prefix_info * pinfo)5952 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5953 struct prefix_info *pinfo)
5954 {
5955 struct sk_buff *skb;
5956 struct net *net = dev_net(idev->dev);
5957 int err = -ENOBUFS;
5958
5959 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5960 if (!skb)
5961 goto errout;
5962
5963 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5964 if (err < 0) {
5965 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5966 WARN_ON(err == -EMSGSIZE);
5967 kfree_skb(skb);
5968 goto errout;
5969 }
5970 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5971 return;
5972 errout:
5973 if (err < 0)
5974 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5975 }
5976
__ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)5977 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5978 {
5979 struct net *net = dev_net(ifp->idev->dev);
5980
5981 if (event)
5982 ASSERT_RTNL();
5983
5984 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5985
5986 switch (event) {
5987 case RTM_NEWADDR:
5988 /*
5989 * If the address was optimistic we inserted the route at the
5990 * start of our DAD process, so we don't need to do it again.
5991 * If the device was taken down in the middle of the DAD
5992 * cycle there is a race where we could get here without a
5993 * host route, so nothing to insert. That will be fixed when
5994 * the device is brought up.
5995 */
5996 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
5997 ip6_ins_rt(net, ifp->rt);
5998 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
5999 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6000 &ifp->addr, ifp->idev->dev->name);
6001 }
6002
6003 if (ifp->idev->cnf.forwarding)
6004 addrconf_join_anycast(ifp);
6005 if (!ipv6_addr_any(&ifp->peer_addr))
6006 addrconf_prefix_route(&ifp->peer_addr, 128, 0,
6007 ifp->idev->dev, 0, 0,
6008 GFP_ATOMIC);
6009 break;
6010 case RTM_DELADDR:
6011 if (ifp->idev->cnf.forwarding)
6012 addrconf_leave_anycast(ifp);
6013 addrconf_leave_solict(ifp->idev, &ifp->addr);
6014 if (!ipv6_addr_any(&ifp->peer_addr)) {
6015 struct fib6_info *rt;
6016
6017 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6018 ifp->idev->dev, 0, 0,
6019 false);
6020 if (rt)
6021 ip6_del_rt(net, rt);
6022 }
6023 if (ifp->rt) {
6024 ip6_del_rt(net, ifp->rt);
6025 ifp->rt = NULL;
6026 }
6027 rt_genid_bump_ipv6(net);
6028 break;
6029 }
6030 atomic_inc(&net->ipv6.dev_addr_genid);
6031 }
6032
ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)6033 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6034 {
6035 rcu_read_lock_bh();
6036 if (likely(ifp->idev->dead == 0))
6037 __ipv6_ifa_notify(event, ifp);
6038 rcu_read_unlock_bh();
6039 }
6040
6041 #ifdef CONFIG_SYSCTL
6042
6043 static
addrconf_sysctl_forward(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6044 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6045 void __user *buffer, size_t *lenp, loff_t *ppos)
6046 {
6047 int *valp = ctl->data;
6048 int val = *valp;
6049 loff_t pos = *ppos;
6050 struct ctl_table lctl;
6051 int ret;
6052
6053 /*
6054 * ctl->data points to idev->cnf.forwarding, we should
6055 * not modify it until we get the rtnl lock.
6056 */
6057 lctl = *ctl;
6058 lctl.data = &val;
6059
6060 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6061
6062 if (write)
6063 ret = addrconf_fixup_forwarding(ctl, valp, val);
6064 if (ret)
6065 *ppos = pos;
6066 return ret;
6067 }
6068
6069 static
addrconf_sysctl_mtu(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6070 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6071 void __user *buffer, size_t *lenp, loff_t *ppos)
6072 {
6073 struct inet6_dev *idev = ctl->extra1;
6074 int min_mtu = IPV6_MIN_MTU;
6075 struct ctl_table lctl;
6076
6077 lctl = *ctl;
6078 lctl.extra1 = &min_mtu;
6079 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6080
6081 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6082 }
6083
dev_disable_change(struct inet6_dev * idev)6084 static void dev_disable_change(struct inet6_dev *idev)
6085 {
6086 struct netdev_notifier_info info;
6087
6088 if (!idev || !idev->dev)
6089 return;
6090
6091 netdev_notifier_info_init(&info, idev->dev);
6092 if (idev->cnf.disable_ipv6)
6093 addrconf_notify(NULL, NETDEV_DOWN, &info);
6094 else
6095 addrconf_notify(NULL, NETDEV_UP, &info);
6096 }
6097
addrconf_disable_change(struct net * net,__s32 newf)6098 static void addrconf_disable_change(struct net *net, __s32 newf)
6099 {
6100 struct net_device *dev;
6101 struct inet6_dev *idev;
6102
6103 for_each_netdev(net, dev) {
6104 idev = __in6_dev_get(dev);
6105 if (idev) {
6106 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6107 idev->cnf.disable_ipv6 = newf;
6108 if (changed)
6109 dev_disable_change(idev);
6110 }
6111 }
6112 }
6113
addrconf_disable_ipv6(struct ctl_table * table,int * p,int newf)6114 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6115 {
6116 struct net *net;
6117 int old;
6118
6119 if (!rtnl_trylock())
6120 return restart_syscall();
6121
6122 net = (struct net *)table->extra2;
6123 old = *p;
6124 *p = newf;
6125
6126 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6127 rtnl_unlock();
6128 return 0;
6129 }
6130
6131 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6132 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6133 addrconf_disable_change(net, newf);
6134 } else if ((!newf) ^ (!old))
6135 dev_disable_change((struct inet6_dev *)table->extra1);
6136
6137 rtnl_unlock();
6138 return 0;
6139 }
6140
6141 static
addrconf_sysctl_disable(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6142 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6143 void __user *buffer, size_t *lenp, loff_t *ppos)
6144 {
6145 int *valp = ctl->data;
6146 int val = *valp;
6147 loff_t pos = *ppos;
6148 struct ctl_table lctl;
6149 int ret;
6150
6151 /*
6152 * ctl->data points to idev->cnf.disable_ipv6, we should
6153 * not modify it until we get the rtnl lock.
6154 */
6155 lctl = *ctl;
6156 lctl.data = &val;
6157
6158 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6159
6160 if (write)
6161 ret = addrconf_disable_ipv6(ctl, valp, val);
6162 if (ret)
6163 *ppos = pos;
6164 return ret;
6165 }
6166
6167 static
addrconf_sysctl_proxy_ndp(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6168 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6169 void __user *buffer, size_t *lenp, loff_t *ppos)
6170 {
6171 int *valp = ctl->data;
6172 int ret;
6173 int old, new;
6174
6175 old = *valp;
6176 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6177 new = *valp;
6178
6179 if (write && old != new) {
6180 struct net *net = ctl->extra2;
6181
6182 if (!rtnl_trylock())
6183 return restart_syscall();
6184
6185 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6186 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6187 NETCONFA_PROXY_NEIGH,
6188 NETCONFA_IFINDEX_DEFAULT,
6189 net->ipv6.devconf_dflt);
6190 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6191 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6192 NETCONFA_PROXY_NEIGH,
6193 NETCONFA_IFINDEX_ALL,
6194 net->ipv6.devconf_all);
6195 else {
6196 struct inet6_dev *idev = ctl->extra1;
6197
6198 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6199 NETCONFA_PROXY_NEIGH,
6200 idev->dev->ifindex,
6201 &idev->cnf);
6202 }
6203 rtnl_unlock();
6204 }
6205
6206 return ret;
6207 }
6208
addrconf_sysctl_addr_gen_mode(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6209 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6210 void __user *buffer, size_t *lenp,
6211 loff_t *ppos)
6212 {
6213 int ret = 0;
6214 u32 new_val;
6215 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6216 struct net *net = (struct net *)ctl->extra2;
6217 struct ctl_table tmp = {
6218 .data = &new_val,
6219 .maxlen = sizeof(new_val),
6220 .mode = ctl->mode,
6221 };
6222
6223 if (!rtnl_trylock())
6224 return restart_syscall();
6225
6226 new_val = *((u32 *)ctl->data);
6227
6228 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6229 if (ret != 0)
6230 goto out;
6231
6232 if (write) {
6233 if (check_addr_gen_mode(new_val) < 0) {
6234 ret = -EINVAL;
6235 goto out;
6236 }
6237
6238 if (idev) {
6239 if (check_stable_privacy(idev, net, new_val) < 0) {
6240 ret = -EINVAL;
6241 goto out;
6242 }
6243
6244 if (idev->cnf.addr_gen_mode != new_val) {
6245 idev->cnf.addr_gen_mode = new_val;
6246 addrconf_dev_config(idev->dev);
6247 }
6248 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6249 struct net_device *dev;
6250
6251 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6252 for_each_netdev(net, dev) {
6253 idev = __in6_dev_get(dev);
6254 if (idev &&
6255 idev->cnf.addr_gen_mode != new_val) {
6256 idev->cnf.addr_gen_mode = new_val;
6257 addrconf_dev_config(idev->dev);
6258 }
6259 }
6260 }
6261
6262 *((u32 *)ctl->data) = new_val;
6263 }
6264
6265 out:
6266 rtnl_unlock();
6267
6268 return ret;
6269 }
6270
addrconf_sysctl_stable_secret(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6271 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6272 void __user *buffer, size_t *lenp,
6273 loff_t *ppos)
6274 {
6275 int err;
6276 struct in6_addr addr;
6277 char str[IPV6_MAX_STRLEN];
6278 struct ctl_table lctl = *ctl;
6279 struct net *net = ctl->extra2;
6280 struct ipv6_stable_secret *secret = ctl->data;
6281
6282 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6283 return -EIO;
6284
6285 lctl.maxlen = IPV6_MAX_STRLEN;
6286 lctl.data = str;
6287
6288 if (!rtnl_trylock())
6289 return restart_syscall();
6290
6291 if (!write && !secret->initialized) {
6292 err = -EIO;
6293 goto out;
6294 }
6295
6296 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6297 if (err >= sizeof(str)) {
6298 err = -EIO;
6299 goto out;
6300 }
6301
6302 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6303 if (err || !write)
6304 goto out;
6305
6306 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6307 err = -EIO;
6308 goto out;
6309 }
6310
6311 secret->initialized = true;
6312 secret->secret = addr;
6313
6314 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6315 struct net_device *dev;
6316
6317 for_each_netdev(net, dev) {
6318 struct inet6_dev *idev = __in6_dev_get(dev);
6319
6320 if (idev) {
6321 idev->cnf.addr_gen_mode =
6322 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6323 }
6324 }
6325 } else {
6326 struct inet6_dev *idev = ctl->extra1;
6327
6328 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6329 }
6330
6331 out:
6332 rtnl_unlock();
6333
6334 return err;
6335 }
6336
6337 static
addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6338 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6339 int write,
6340 void __user *buffer,
6341 size_t *lenp,
6342 loff_t *ppos)
6343 {
6344 int *valp = ctl->data;
6345 int val = *valp;
6346 loff_t pos = *ppos;
6347 struct ctl_table lctl;
6348 int ret;
6349
6350 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6351 * we should not modify it until we get the rtnl lock.
6352 */
6353 lctl = *ctl;
6354 lctl.data = &val;
6355
6356 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6357
6358 if (write)
6359 ret = addrconf_fixup_linkdown(ctl, valp, val);
6360 if (ret)
6361 *ppos = pos;
6362 return ret;
6363 }
6364
6365 static
addrconf_set_nopolicy(struct rt6_info * rt,int action)6366 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6367 {
6368 if (rt) {
6369 if (action)
6370 rt->dst.flags |= DST_NOPOLICY;
6371 else
6372 rt->dst.flags &= ~DST_NOPOLICY;
6373 }
6374 }
6375
6376 static
addrconf_disable_policy_idev(struct inet6_dev * idev,int val)6377 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6378 {
6379 struct inet6_ifaddr *ifa;
6380
6381 read_lock_bh(&idev->lock);
6382 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6383 spin_lock(&ifa->lock);
6384 if (ifa->rt) {
6385 /* host routes only use builtin fib6_nh */
6386 struct fib6_nh *nh = ifa->rt->fib6_nh;
6387 int cpu;
6388
6389 rcu_read_lock();
6390 ifa->rt->dst_nopolicy = val ? true : false;
6391 if (nh->rt6i_pcpu) {
6392 for_each_possible_cpu(cpu) {
6393 struct rt6_info **rtp;
6394
6395 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6396 addrconf_set_nopolicy(*rtp, val);
6397 }
6398 }
6399 rcu_read_unlock();
6400 }
6401 spin_unlock(&ifa->lock);
6402 }
6403 read_unlock_bh(&idev->lock);
6404 }
6405
6406 static
addrconf_disable_policy(struct ctl_table * ctl,int * valp,int val)6407 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6408 {
6409 struct inet6_dev *idev;
6410 struct net *net;
6411
6412 if (!rtnl_trylock())
6413 return restart_syscall();
6414
6415 *valp = val;
6416
6417 net = (struct net *)ctl->extra2;
6418 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6419 rtnl_unlock();
6420 return 0;
6421 }
6422
6423 if (valp == &net->ipv6.devconf_all->disable_policy) {
6424 struct net_device *dev;
6425
6426 for_each_netdev(net, dev) {
6427 idev = __in6_dev_get(dev);
6428 if (idev)
6429 addrconf_disable_policy_idev(idev, val);
6430 }
6431 } else {
6432 idev = (struct inet6_dev *)ctl->extra1;
6433 addrconf_disable_policy_idev(idev, val);
6434 }
6435
6436 rtnl_unlock();
6437 return 0;
6438 }
6439
6440 static
addrconf_sysctl_disable_policy(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6441 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6442 void __user *buffer, size_t *lenp,
6443 loff_t *ppos)
6444 {
6445 int *valp = ctl->data;
6446 int val = *valp;
6447 loff_t pos = *ppos;
6448 struct ctl_table lctl;
6449 int ret;
6450
6451 lctl = *ctl;
6452 lctl.data = &val;
6453 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6454
6455 if (write && (*valp != val))
6456 ret = addrconf_disable_policy(ctl, valp, val);
6457
6458 if (ret)
6459 *ppos = pos;
6460
6461 return ret;
6462 }
6463
6464 static int minus_one = -1;
6465 static const int two_five_five = 255;
6466
6467 static const struct ctl_table addrconf_sysctl[] = {
6468 {
6469 .procname = "forwarding",
6470 .data = &ipv6_devconf.forwarding,
6471 .maxlen = sizeof(int),
6472 .mode = 0644,
6473 .proc_handler = addrconf_sysctl_forward,
6474 },
6475 {
6476 .procname = "hop_limit",
6477 .data = &ipv6_devconf.hop_limit,
6478 .maxlen = sizeof(int),
6479 .mode = 0644,
6480 .proc_handler = proc_dointvec_minmax,
6481 .extra1 = (void *)SYSCTL_ONE,
6482 .extra2 = (void *)&two_five_five,
6483 },
6484 {
6485 .procname = "mtu",
6486 .data = &ipv6_devconf.mtu6,
6487 .maxlen = sizeof(int),
6488 .mode = 0644,
6489 .proc_handler = addrconf_sysctl_mtu,
6490 },
6491 {
6492 .procname = "accept_ra",
6493 .data = &ipv6_devconf.accept_ra,
6494 .maxlen = sizeof(int),
6495 .mode = 0644,
6496 .proc_handler = proc_dointvec,
6497 },
6498 {
6499 .procname = "accept_redirects",
6500 .data = &ipv6_devconf.accept_redirects,
6501 .maxlen = sizeof(int),
6502 .mode = 0644,
6503 .proc_handler = proc_dointvec,
6504 },
6505 {
6506 .procname = "autoconf",
6507 .data = &ipv6_devconf.autoconf,
6508 .maxlen = sizeof(int),
6509 .mode = 0644,
6510 .proc_handler = proc_dointvec,
6511 },
6512 {
6513 .procname = "dad_transmits",
6514 .data = &ipv6_devconf.dad_transmits,
6515 .maxlen = sizeof(int),
6516 .mode = 0644,
6517 .proc_handler = proc_dointvec,
6518 },
6519 {
6520 .procname = "router_solicitations",
6521 .data = &ipv6_devconf.rtr_solicits,
6522 .maxlen = sizeof(int),
6523 .mode = 0644,
6524 .proc_handler = proc_dointvec_minmax,
6525 .extra1 = &minus_one,
6526 },
6527 {
6528 .procname = "router_solicitation_interval",
6529 .data = &ipv6_devconf.rtr_solicit_interval,
6530 .maxlen = sizeof(int),
6531 .mode = 0644,
6532 .proc_handler = proc_dointvec_jiffies,
6533 },
6534 {
6535 .procname = "router_solicitation_max_interval",
6536 .data = &ipv6_devconf.rtr_solicit_max_interval,
6537 .maxlen = sizeof(int),
6538 .mode = 0644,
6539 .proc_handler = proc_dointvec_jiffies,
6540 },
6541 {
6542 .procname = "router_solicitation_delay",
6543 .data = &ipv6_devconf.rtr_solicit_delay,
6544 .maxlen = sizeof(int),
6545 .mode = 0644,
6546 .proc_handler = proc_dointvec_jiffies,
6547 },
6548 {
6549 .procname = "force_mld_version",
6550 .data = &ipv6_devconf.force_mld_version,
6551 .maxlen = sizeof(int),
6552 .mode = 0644,
6553 .proc_handler = proc_dointvec,
6554 },
6555 {
6556 .procname = "mldv1_unsolicited_report_interval",
6557 .data =
6558 &ipv6_devconf.mldv1_unsolicited_report_interval,
6559 .maxlen = sizeof(int),
6560 .mode = 0644,
6561 .proc_handler = proc_dointvec_ms_jiffies,
6562 },
6563 {
6564 .procname = "mldv2_unsolicited_report_interval",
6565 .data =
6566 &ipv6_devconf.mldv2_unsolicited_report_interval,
6567 .maxlen = sizeof(int),
6568 .mode = 0644,
6569 .proc_handler = proc_dointvec_ms_jiffies,
6570 },
6571 {
6572 .procname = "use_tempaddr",
6573 .data = &ipv6_devconf.use_tempaddr,
6574 .maxlen = sizeof(int),
6575 .mode = 0644,
6576 .proc_handler = proc_dointvec,
6577 },
6578 {
6579 .procname = "temp_valid_lft",
6580 .data = &ipv6_devconf.temp_valid_lft,
6581 .maxlen = sizeof(int),
6582 .mode = 0644,
6583 .proc_handler = proc_dointvec,
6584 },
6585 {
6586 .procname = "temp_prefered_lft",
6587 .data = &ipv6_devconf.temp_prefered_lft,
6588 .maxlen = sizeof(int),
6589 .mode = 0644,
6590 .proc_handler = proc_dointvec,
6591 },
6592 {
6593 .procname = "regen_max_retry",
6594 .data = &ipv6_devconf.regen_max_retry,
6595 .maxlen = sizeof(int),
6596 .mode = 0644,
6597 .proc_handler = proc_dointvec,
6598 },
6599 {
6600 .procname = "max_desync_factor",
6601 .data = &ipv6_devconf.max_desync_factor,
6602 .maxlen = sizeof(int),
6603 .mode = 0644,
6604 .proc_handler = proc_dointvec,
6605 },
6606 {
6607 .procname = "max_addresses",
6608 .data = &ipv6_devconf.max_addresses,
6609 .maxlen = sizeof(int),
6610 .mode = 0644,
6611 .proc_handler = proc_dointvec,
6612 },
6613 {
6614 .procname = "accept_ra_defrtr",
6615 .data = &ipv6_devconf.accept_ra_defrtr,
6616 .maxlen = sizeof(int),
6617 .mode = 0644,
6618 .proc_handler = proc_dointvec,
6619 },
6620 {
6621 .procname = "accept_ra_min_hop_limit",
6622 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6623 .maxlen = sizeof(int),
6624 .mode = 0644,
6625 .proc_handler = proc_dointvec,
6626 },
6627 {
6628 .procname = "accept_ra_pinfo",
6629 .data = &ipv6_devconf.accept_ra_pinfo,
6630 .maxlen = sizeof(int),
6631 .mode = 0644,
6632 .proc_handler = proc_dointvec,
6633 },
6634 #ifdef CONFIG_IPV6_ROUTER_PREF
6635 {
6636 .procname = "accept_ra_rtr_pref",
6637 .data = &ipv6_devconf.accept_ra_rtr_pref,
6638 .maxlen = sizeof(int),
6639 .mode = 0644,
6640 .proc_handler = proc_dointvec,
6641 },
6642 {
6643 .procname = "router_probe_interval",
6644 .data = &ipv6_devconf.rtr_probe_interval,
6645 .maxlen = sizeof(int),
6646 .mode = 0644,
6647 .proc_handler = proc_dointvec_jiffies,
6648 },
6649 #ifdef CONFIG_IPV6_ROUTE_INFO
6650 {
6651 .procname = "accept_ra_rt_info_min_plen",
6652 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6653 .maxlen = sizeof(int),
6654 .mode = 0644,
6655 .proc_handler = proc_dointvec,
6656 },
6657 {
6658 .procname = "accept_ra_rt_info_max_plen",
6659 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6660 .maxlen = sizeof(int),
6661 .mode = 0644,
6662 .proc_handler = proc_dointvec,
6663 },
6664 #endif
6665 #endif
6666 {
6667 .procname = "accept_ra_rt_table",
6668 .data = &ipv6_devconf.accept_ra_rt_table,
6669 .maxlen = sizeof(int),
6670 .mode = 0644,
6671 .proc_handler = proc_dointvec,
6672 },
6673 {
6674 .procname = "proxy_ndp",
6675 .data = &ipv6_devconf.proxy_ndp,
6676 .maxlen = sizeof(int),
6677 .mode = 0644,
6678 .proc_handler = addrconf_sysctl_proxy_ndp,
6679 },
6680 {
6681 .procname = "accept_source_route",
6682 .data = &ipv6_devconf.accept_source_route,
6683 .maxlen = sizeof(int),
6684 .mode = 0644,
6685 .proc_handler = proc_dointvec,
6686 },
6687 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6688 {
6689 .procname = "optimistic_dad",
6690 .data = &ipv6_devconf.optimistic_dad,
6691 .maxlen = sizeof(int),
6692 .mode = 0644,
6693 .proc_handler = proc_dointvec,
6694 },
6695 {
6696 .procname = "use_optimistic",
6697 .data = &ipv6_devconf.use_optimistic,
6698 .maxlen = sizeof(int),
6699 .mode = 0644,
6700 .proc_handler = proc_dointvec,
6701 },
6702 #endif
6703 #ifdef CONFIG_IPV6_MROUTE
6704 {
6705 .procname = "mc_forwarding",
6706 .data = &ipv6_devconf.mc_forwarding,
6707 .maxlen = sizeof(int),
6708 .mode = 0444,
6709 .proc_handler = proc_dointvec,
6710 },
6711 #endif
6712 {
6713 .procname = "disable_ipv6",
6714 .data = &ipv6_devconf.disable_ipv6,
6715 .maxlen = sizeof(int),
6716 .mode = 0644,
6717 .proc_handler = addrconf_sysctl_disable,
6718 },
6719 {
6720 .procname = "accept_dad",
6721 .data = &ipv6_devconf.accept_dad,
6722 .maxlen = sizeof(int),
6723 .mode = 0644,
6724 .proc_handler = proc_dointvec,
6725 },
6726 {
6727 .procname = "force_tllao",
6728 .data = &ipv6_devconf.force_tllao,
6729 .maxlen = sizeof(int),
6730 .mode = 0644,
6731 .proc_handler = proc_dointvec
6732 },
6733 {
6734 .procname = "ndisc_notify",
6735 .data = &ipv6_devconf.ndisc_notify,
6736 .maxlen = sizeof(int),
6737 .mode = 0644,
6738 .proc_handler = proc_dointvec
6739 },
6740 {
6741 .procname = "suppress_frag_ndisc",
6742 .data = &ipv6_devconf.suppress_frag_ndisc,
6743 .maxlen = sizeof(int),
6744 .mode = 0644,
6745 .proc_handler = proc_dointvec
6746 },
6747 {
6748 .procname = "accept_ra_from_local",
6749 .data = &ipv6_devconf.accept_ra_from_local,
6750 .maxlen = sizeof(int),
6751 .mode = 0644,
6752 .proc_handler = proc_dointvec,
6753 },
6754 {
6755 .procname = "accept_ra_mtu",
6756 .data = &ipv6_devconf.accept_ra_mtu,
6757 .maxlen = sizeof(int),
6758 .mode = 0644,
6759 .proc_handler = proc_dointvec,
6760 },
6761 {
6762 .procname = "stable_secret",
6763 .data = &ipv6_devconf.stable_secret,
6764 .maxlen = IPV6_MAX_STRLEN,
6765 .mode = 0600,
6766 .proc_handler = addrconf_sysctl_stable_secret,
6767 },
6768 {
6769 .procname = "use_oif_addrs_only",
6770 .data = &ipv6_devconf.use_oif_addrs_only,
6771 .maxlen = sizeof(int),
6772 .mode = 0644,
6773 .proc_handler = proc_dointvec,
6774 },
6775 {
6776 .procname = "ignore_routes_with_linkdown",
6777 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6778 .maxlen = sizeof(int),
6779 .mode = 0644,
6780 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6781 },
6782 {
6783 .procname = "drop_unicast_in_l2_multicast",
6784 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6785 .maxlen = sizeof(int),
6786 .mode = 0644,
6787 .proc_handler = proc_dointvec,
6788 },
6789 {
6790 .procname = "drop_unsolicited_na",
6791 .data = &ipv6_devconf.drop_unsolicited_na,
6792 .maxlen = sizeof(int),
6793 .mode = 0644,
6794 .proc_handler = proc_dointvec,
6795 },
6796 {
6797 .procname = "keep_addr_on_down",
6798 .data = &ipv6_devconf.keep_addr_on_down,
6799 .maxlen = sizeof(int),
6800 .mode = 0644,
6801 .proc_handler = proc_dointvec,
6802
6803 },
6804 {
6805 .procname = "seg6_enabled",
6806 .data = &ipv6_devconf.seg6_enabled,
6807 .maxlen = sizeof(int),
6808 .mode = 0644,
6809 .proc_handler = proc_dointvec,
6810 },
6811 #ifdef CONFIG_IPV6_SEG6_HMAC
6812 {
6813 .procname = "seg6_require_hmac",
6814 .data = &ipv6_devconf.seg6_require_hmac,
6815 .maxlen = sizeof(int),
6816 .mode = 0644,
6817 .proc_handler = proc_dointvec,
6818 },
6819 #endif
6820 {
6821 .procname = "enhanced_dad",
6822 .data = &ipv6_devconf.enhanced_dad,
6823 .maxlen = sizeof(int),
6824 .mode = 0644,
6825 .proc_handler = proc_dointvec,
6826 },
6827 {
6828 .procname = "addr_gen_mode",
6829 .data = &ipv6_devconf.addr_gen_mode,
6830 .maxlen = sizeof(int),
6831 .mode = 0644,
6832 .proc_handler = addrconf_sysctl_addr_gen_mode,
6833 },
6834 {
6835 .procname = "disable_policy",
6836 .data = &ipv6_devconf.disable_policy,
6837 .maxlen = sizeof(int),
6838 .mode = 0644,
6839 .proc_handler = addrconf_sysctl_disable_policy,
6840 },
6841 {
6842 .procname = "ndisc_tclass",
6843 .data = &ipv6_devconf.ndisc_tclass,
6844 .maxlen = sizeof(int),
6845 .mode = 0644,
6846 .proc_handler = proc_dointvec_minmax,
6847 .extra1 = (void *)SYSCTL_ZERO,
6848 .extra2 = (void *)&two_five_five,
6849 },
6850 {
6851 /* sentinel */
6852 }
6853 };
6854
__addrconf_sysctl_register(struct net * net,char * dev_name,struct inet6_dev * idev,struct ipv6_devconf * p)6855 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6856 struct inet6_dev *idev, struct ipv6_devconf *p)
6857 {
6858 int i, ifindex;
6859 struct ctl_table *table;
6860 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6861
6862 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6863 if (!table)
6864 goto out;
6865
6866 for (i = 0; table[i].data; i++) {
6867 table[i].data += (char *)p - (char *)&ipv6_devconf;
6868 /* If one of these is already set, then it is not safe to
6869 * overwrite either of them: this makes proc_dointvec_minmax
6870 * usable.
6871 */
6872 if (!table[i].extra1 && !table[i].extra2) {
6873 table[i].extra1 = idev; /* embedded; no ref */
6874 table[i].extra2 = net;
6875 }
6876 }
6877
6878 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6879
6880 p->sysctl_header = register_net_sysctl(net, path, table);
6881 if (!p->sysctl_header)
6882 goto free;
6883
6884 if (!strcmp(dev_name, "all"))
6885 ifindex = NETCONFA_IFINDEX_ALL;
6886 else if (!strcmp(dev_name, "default"))
6887 ifindex = NETCONFA_IFINDEX_DEFAULT;
6888 else
6889 ifindex = idev->dev->ifindex;
6890 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6891 ifindex, p);
6892 return 0;
6893
6894 free:
6895 kfree(table);
6896 out:
6897 return -ENOBUFS;
6898 }
6899
__addrconf_sysctl_unregister(struct net * net,struct ipv6_devconf * p,int ifindex)6900 static void __addrconf_sysctl_unregister(struct net *net,
6901 struct ipv6_devconf *p, int ifindex)
6902 {
6903 struct ctl_table *table;
6904
6905 if (!p->sysctl_header)
6906 return;
6907
6908 table = p->sysctl_header->ctl_table_arg;
6909 unregister_net_sysctl_table(p->sysctl_header);
6910 p->sysctl_header = NULL;
6911 kfree(table);
6912
6913 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6914 }
6915
addrconf_sysctl_register(struct inet6_dev * idev)6916 static int addrconf_sysctl_register(struct inet6_dev *idev)
6917 {
6918 int err;
6919
6920 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6921 return -EINVAL;
6922
6923 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6924 &ndisc_ifinfo_sysctl_change);
6925 if (err)
6926 return err;
6927 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6928 idev, &idev->cnf);
6929 if (err)
6930 neigh_sysctl_unregister(idev->nd_parms);
6931
6932 return err;
6933 }
6934
addrconf_sysctl_unregister(struct inet6_dev * idev)6935 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6936 {
6937 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6938 idev->dev->ifindex);
6939 neigh_sysctl_unregister(idev->nd_parms);
6940 }
6941
6942
6943 #endif
6944
addrconf_init_net(struct net * net)6945 static int __net_init addrconf_init_net(struct net *net)
6946 {
6947 int err = -ENOMEM;
6948 struct ipv6_devconf *all, *dflt;
6949
6950 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6951 if (!all)
6952 goto err_alloc_all;
6953
6954 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6955 if (!dflt)
6956 goto err_alloc_dflt;
6957
6958 if (IS_ENABLED(CONFIG_SYSCTL) &&
6959 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
6960 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
6961 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
6962 }
6963
6964 /* these will be inherited by all namespaces */
6965 dflt->autoconf = ipv6_defaults.autoconf;
6966 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6967
6968 dflt->stable_secret.initialized = false;
6969 all->stable_secret.initialized = false;
6970
6971 net->ipv6.devconf_all = all;
6972 net->ipv6.devconf_dflt = dflt;
6973
6974 #ifdef CONFIG_SYSCTL
6975 err = __addrconf_sysctl_register(net, "all", NULL, all);
6976 if (err < 0)
6977 goto err_reg_all;
6978
6979 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6980 if (err < 0)
6981 goto err_reg_dflt;
6982 #endif
6983 return 0;
6984
6985 #ifdef CONFIG_SYSCTL
6986 err_reg_dflt:
6987 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6988 err_reg_all:
6989 kfree(dflt);
6990 #endif
6991 err_alloc_dflt:
6992 kfree(all);
6993 err_alloc_all:
6994 return err;
6995 }
6996
addrconf_exit_net(struct net * net)6997 static void __net_exit addrconf_exit_net(struct net *net)
6998 {
6999 #ifdef CONFIG_SYSCTL
7000 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7001 NETCONFA_IFINDEX_DEFAULT);
7002 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7003 NETCONFA_IFINDEX_ALL);
7004 #endif
7005 kfree(net->ipv6.devconf_dflt);
7006 kfree(net->ipv6.devconf_all);
7007 }
7008
7009 static struct pernet_operations addrconf_ops = {
7010 .init = addrconf_init_net,
7011 .exit = addrconf_exit_net,
7012 };
7013
7014 static struct rtnl_af_ops inet6_ops __read_mostly = {
7015 .family = AF_INET6,
7016 .fill_link_af = inet6_fill_link_af,
7017 .get_link_af_size = inet6_get_link_af_size,
7018 .validate_link_af = inet6_validate_link_af,
7019 .set_link_af = inet6_set_link_af,
7020 };
7021
7022 /*
7023 * Init / cleanup code
7024 */
7025
addrconf_init(void)7026 int __init addrconf_init(void)
7027 {
7028 struct inet6_dev *idev;
7029 int i, err;
7030
7031 err = ipv6_addr_label_init();
7032 if (err < 0) {
7033 pr_crit("%s: cannot initialize default policy table: %d\n",
7034 __func__, err);
7035 goto out;
7036 }
7037
7038 err = register_pernet_subsys(&addrconf_ops);
7039 if (err < 0)
7040 goto out_addrlabel;
7041
7042 addrconf_wq = create_workqueue("ipv6_addrconf");
7043 if (!addrconf_wq) {
7044 err = -ENOMEM;
7045 goto out_nowq;
7046 }
7047
7048 /* The addrconf netdev notifier requires that loopback_dev
7049 * has it's ipv6 private information allocated and setup
7050 * before it can bring up and give link-local addresses
7051 * to other devices which are up.
7052 *
7053 * Unfortunately, loopback_dev is not necessarily the first
7054 * entry in the global dev_base list of net devices. In fact,
7055 * it is likely to be the very last entry on that list.
7056 * So this causes the notifier registry below to try and
7057 * give link-local addresses to all devices besides loopback_dev
7058 * first, then loopback_dev, which cases all the non-loopback_dev
7059 * devices to fail to get a link-local address.
7060 *
7061 * So, as a temporary fix, allocate the ipv6 structure for
7062 * loopback_dev first by hand.
7063 * Longer term, all of the dependencies ipv6 has upon the loopback
7064 * device and it being up should be removed.
7065 */
7066 rtnl_lock();
7067 idev = ipv6_add_dev(init_net.loopback_dev);
7068 rtnl_unlock();
7069 if (IS_ERR(idev)) {
7070 err = PTR_ERR(idev);
7071 goto errlo;
7072 }
7073
7074 ip6_route_init_special_entries();
7075
7076 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7077 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7078
7079 register_netdevice_notifier(&ipv6_dev_notf);
7080
7081 addrconf_verify();
7082
7083 rtnl_af_register(&inet6_ops);
7084
7085 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7086 NULL, inet6_dump_ifinfo, 0);
7087 if (err < 0)
7088 goto errout;
7089
7090 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7091 inet6_rtm_newaddr, NULL, 0);
7092 if (err < 0)
7093 goto errout;
7094 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7095 inet6_rtm_deladdr, NULL, 0);
7096 if (err < 0)
7097 goto errout;
7098 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7099 inet6_rtm_getaddr, inet6_dump_ifaddr,
7100 RTNL_FLAG_DOIT_UNLOCKED);
7101 if (err < 0)
7102 goto errout;
7103 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7104 NULL, inet6_dump_ifmcaddr, 0);
7105 if (err < 0)
7106 goto errout;
7107 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7108 NULL, inet6_dump_ifacaddr, 0);
7109 if (err < 0)
7110 goto errout;
7111 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7112 inet6_netconf_get_devconf,
7113 inet6_netconf_dump_devconf,
7114 RTNL_FLAG_DOIT_UNLOCKED);
7115 if (err < 0)
7116 goto errout;
7117 err = ipv6_addr_label_rtnl_register();
7118 if (err < 0)
7119 goto errout;
7120
7121 return 0;
7122 errout:
7123 rtnl_unregister_all(PF_INET6);
7124 rtnl_af_unregister(&inet6_ops);
7125 unregister_netdevice_notifier(&ipv6_dev_notf);
7126 errlo:
7127 destroy_workqueue(addrconf_wq);
7128 out_nowq:
7129 unregister_pernet_subsys(&addrconf_ops);
7130 out_addrlabel:
7131 ipv6_addr_label_cleanup();
7132 out:
7133 return err;
7134 }
7135
addrconf_cleanup(void)7136 void addrconf_cleanup(void)
7137 {
7138 struct net_device *dev;
7139 int i;
7140
7141 unregister_netdevice_notifier(&ipv6_dev_notf);
7142 unregister_pernet_subsys(&addrconf_ops);
7143 ipv6_addr_label_cleanup();
7144
7145 rtnl_af_unregister(&inet6_ops);
7146
7147 rtnl_lock();
7148
7149 /* clean dev list */
7150 for_each_netdev(&init_net, dev) {
7151 if (__in6_dev_get(dev) == NULL)
7152 continue;
7153 addrconf_ifdown(dev, 1);
7154 }
7155 addrconf_ifdown(init_net.loopback_dev, 2);
7156
7157 /*
7158 * Check hash table.
7159 */
7160 spin_lock_bh(&addrconf_hash_lock);
7161 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7162 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7163 spin_unlock_bh(&addrconf_hash_lock);
7164 cancel_delayed_work(&addr_chk_work);
7165 rtnl_unlock();
7166
7167 destroy_workqueue(addrconf_wq);
7168 }
7169