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